JP2018053689A - Construction management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pile core position of a steel pipe pile in the vicinity of a ground.SOLUTION: A construction management system 1 manages driving construction of a steel pipe pile P by a pile driving machine which has a driving section that holds an upper end of the steel pipe pile P and press-fits the steel pipe pile P into a ground while rotating the steel pipe pile P and a bracing member 4 holding the steel pipe pile P in the vicinity of the ground. The construction management system 1 includes: a rail member 20 which is provided on the bracing member 4 and is formed with a second rail 20B rotating around the steel pipe pile P; a second magnet 15B which is slid along the second rail 20B in response to rotation of the steel pipe pile P; a prism 5 mounted on the second magnet 15B; a measuring instrument measuring a position of the prism 5; and a calculation section calculating a pipe core position of the steel pipe pile P based on the plurality of positions of the prism 5 measured by the measuring instrument.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a construction management system for managing a steel pipe pile placing work by a rotary press-fitting method.

  There are cases where ground improvement work is performed to reinforce the ground by placing steel pipe piles in the part where the foundation of the building is to be installed. Various systems for managing the construction of such ground improvement work have been proposed. For example, in Patent Document 1 below, a pile core position of a steel pipe pile is obtained by measuring the position of a prism attached to the steel pipe pile. Is disclosed.

Japanese Patent No. 5546416

  By the way, especially in the initial stage of construction, because the distance between the upper end of the steel pipe pile and the ground is separated, the pile core position at the upper end and the pile core position at a location close to the ground may not match. is there. Thus, in order to know whether the steel pipe pile penetrates into the ground in a correct state, it is important to grasp the pile core position at a location close to the ground of the steel pipe pile.

  However, in said prior art, since the prism was attached to the steel pipe pile itself, a prism must be provided in the upper end part of a steel pipe pile. Therefore, in said prior art, the pile core position of the steel pipe pile near the ground was not able to be measured.

  This invention is made | formed in view of said subject, The objective is to provide the construction management system which can obtain the pile core position of the steel pipe pile in the vicinity of the ground.

  According to the construction management system of the present invention, the problem is to hold the upper end of the steel pipe pile, hold the steel pipe pile near the ground, and a drive unit that press-fits the ground while rotating the steel pipe pile. An anti-rest member, and a construction management system for managing the construction of the steel pipe pile by a pile driving machine comprising: a rail provided on the anti-rest member and having a rail around the steel pipe pile A member, a magnet that slides along the rail with rotation of the steel pipe pile, a first prism attached to the magnet, a measuring instrument that measures the position of the first prism, and the measurement This is solved by providing a calculation unit that calculates a pile core position of the steel pipe pile based on a plurality of positions of the first prism measured by a vessel.

  According to the construction management system concerning the present invention, the pile core position of the steel pipe pile in the vicinity of the ground can be obtained.

It is a figure which shows the structure of the construction management system which concerns on 1st Embodiment. It is an enlarged view of the vicinity of the position measuring jig. It is III-III sectional drawing of FIG. It is a top view for demonstrating the motion of a prism. It is a top view for demonstrating the motion of a prism. It is a top view for demonstrating the motion of a prism. It is a top view for demonstrating the motion of a prism. It is a top view for demonstrating the motion of a prism. It is a figure which shows the structure of an operator terminal. It is a figure explaining an example of the calculation method of the pile core position of a steel pipe pile. It is a figure which shows the structure of the construction management system which concerns on 2nd Embodiment. It is an enlarged view of the vicinity of a drive part. It is a top view for demonstrating the motion of a 1st prism and a 2nd prism. It is XIV-XIV sectional drawing of FIG.

Hereinafter, based on FIG. 1 thru | or FIG. 14, the construction management system which concerns on one Embodiment (henceforth this embodiment) of this invention is demonstrated.
The construction management system 1 according to the present embodiment is a system that can acquire the pile core position of a steel pipe pile that is being placed while the steel pipe pile is being placed by the rotary press-fitting method.

[First Embodiment]
First, the construction management system 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 10.
As shown in FIG. 1, the pile driving machine holds the upper end of the steel pipe pile P, presses the steel pipe pile P into the ground while rotating it, and the vicinity of the ground (for example, a predetermined height from the ground). The anti-rest member 4 holding the steel pipe pile P is provided.

  As shown in FIG. 1, the construction management system 1 includes a position measurement jig 10 provided on a steady member 4 and a prism 5 (an example of an object) provided in the position measurement jig 10. A measuring instrument 2 that measures the position and an operator terminal 3 that calculates the position of the core of the steel pipe pile P based on the measurement result by the measuring instrument 2 are provided.

Hereinafter, the configuration of the position measurement jig 10 will be described with reference to FIGS. 2 and 3.
As shown in FIGS. 2 and 3, the position measuring jig 10 includes a rail member 20 placed on the steadying member 4.
The rail member 20 and the steel pipe pile P are configured to maintain a constant interval by a spacer 17.

  As shown in FIGS. 2 and 3, the rail member 20 is formed with a first rail 20 </ b> A and a second rail 20 </ b> B that go around the steel pipe pile P.

  The first rail 20 </ b> A is an annular rail formed so that the cross section is substantially L-shaped from the inner surface to the center of the rail member 20. The first rail 20A is provided with a first magnet 15A (an example of a first sliding body), and the first magnet 15A can slide on the first rail 20A.

15 A of 1st magnets are permanent magnets, and the front-end | tip part which protruded from the 1st rail 20A to the steel pipe pile P side is in contact with the side surface of the drive part 6. FIG. Accordingly, the first magnet 15A slides along the first rail 20A following the rotation of the steel pipe pile P.
In the present embodiment, the steel pipe pile P is rotated clockwise in FIG. 2, and in this case, the first magnet 15A is also rotated clockwise along the first rail 20A.

  The second rail 20 </ b> B is an annular rail formed as a recess on the upper surface of the rail member 20. As shown in FIG. 2, the second rail 20 </ b> B is provided with a first restricting member 11 and a second restricting member 12, and the second restricting member 12 is provided between the first restricting member 11 and the second restricting member 12. Two magnets 15B (an example of a second sliding body) are arranged. And the 2nd magnet 15B and the 1st control member 11 are connected by elastic members 13 (an example of a connecting member), such as a spring.

The second magnet 15B is a permanent magnet, and the prism 5 is attached to the top of the second magnet 15B.
The second magnet 15B and the first magnet 15A are arranged such that different magnetic poles face each other. That is, the first magnet 15A and the second magnet 15B are arranged so as to attract each other. Therefore, when the first magnet 15A passes below the second magnet 15B, the first magnet 15A attracts the second magnet 15B, so that the second magnet 15B follows the first magnet 15A and follows the second rail. Slide along 20B.

  Here, the movement of the prism 5 attached to the second magnet 15B will be described with reference to FIGS. In the following, since the prism 5 is attached to the second magnet 15B, the second magnet 15B and the prism 5 perform the same movement.

4 to 8 correspond to views of the position measuring jig 10 as viewed from above. Here, in the 2nd rail 20B, it is the range divided by the 1st control member 11 and the 2nd control member 12, Comprising: The range in which the 2nd magnet 15B was provided is the sliding range of the 2nd magnet 15B. To do.
When the sliding range is opposite to the measuring instrument 2 and the prism 5 is in the sliding range, the measuring instrument 2 can always track the prism 5.

  The first magnet 15 </ b> A moves along the first rail 20 </ b> A at the same rotational speed as the steel pipe pile P as the steel pipe pile P rotates. Here, it is assumed that the rotation direction of the first magnet 15A is clockwise.

In the state shown in FIG. 4, the elastic member 13 is compressed to the minimum length, and in this case, the second magnet 15 </ b> B is stopped in the vicinity of the first regulating member 11.
Here, the first magnet 15A approaches the second magnet 15B from the rear of the first restricting member 11, and reaches the first magnet 15A below the second magnet 15B as shown in FIG. Then, as shown in FIG. 6, the second magnet 15B is attracted to the first magnet 15A and follows the first magnet 15A to slide on the second rail 20B in the clockwise direction.

Next, as shown in FIG. 7, when the second magnet 15 </ b> B slides along the second rail 20 </ b> B and reaches the second restricting member 12, movement of the second magnet 15 </ b> B is restricted by the second restricting member 12. Is done. On the other hand, since the first magnet 15A continues the circular motion along the first rail 20A, the distance between the first magnet 15A and the second magnet 15B is increased, and the attractive force of both is weakened. Then, as shown in FIG. 8, it is going to restore | restore from the state which the elastic member 13 which connects the 2nd magnet 15B and the 1st control member 11 extended. Thereby, the 2nd magnet 15B is pulled back to the 1st control member 11 side, As a result, the 2nd magnet 15B returns to the state of FIG.
The above cycle is repeated each time the first magnet 15A makes a round on the first rail 20A.

The measuring instrument 2 irradiates a region including the sliding range of the second magnet 15B with light waves, and determines the position coordinates (three-dimensional coordinates) of the prism 5 based on the reflected light from the prism 5 attached to the second magnet 15B. measure. The measuring device 2 repeatedly measures the position coordinates of the prism 5 at predetermined time intervals.
In addition, according to the construction management system 1 which concerns on 1st Embodiment, the prism 5 reciprocates the sliding range between the 1st control member 11 and the 2nd control member 12, and it does not hide in the steel pipe pile P. Therefore, the measuring instrument 2 can always measure the position of the prism 5.
And the measuring device 2 transmits sequentially the position of the measured prism 5 with respect to the operator terminal 3 connected so that communication was possible.

  The operator terminal 3 is a computer operated by an operator of the pile driving machine. The operator terminal 3 may be a portable terminal such as a smartphone or a tablet terminal, or may be an operation terminal provided in the pile driving machine.

  As shown in FIG. 9, the operator terminal 3 includes a calculation unit 3A, a storage unit 3B, a communication unit 3C, and an output unit 3D.

The arithmetic unit 3A is realized by, for example, a CPU (Central Processing Unit), and executes numerical calculation, information processing, and device control.
In this embodiment, 3 A of calculating parts calculate the pile core position of the steel pipe pile P based on the positional information (coordinate information) of the prism 5 acquired from the measuring device 2. FIG.
Hereinafter, an example of the calculation processing of the pile core position of the steel pipe pile P executed by the calculation unit 3A will be described with reference to FIG.

As shown in FIG. 10, it is assumed that the position coordinates measured by the measuring instrument 2 for the prism 5 are two points X1 and X2. In this case, the calculation unit 3A has an intersection (A, B) of a circle centered on the coordinate position X1 and having a radius of a predetermined distance R and a circle centered on the coordinate position X2 and having a radius of the predetermined distance R. ) Is calculated.
Next, 3 A of calculating parts obtain the intersection (A) of the side far from the measuring device 2 as a pile core position among the calculated coordinate positions.
The distance R is the total value of the radius of the steel pipe pile P (distance from the center to the outer periphery), the width of the spacer 17, and the distance from the inner peripheral surface of the rail member 20 to the central portion of the second rail 20B. This distance R is a fixed value and may be stored in advance in the storage unit 3B.

  The calculation method of the pile core position of the steel pipe pile P by the calculation unit 3A is not limited to the above example. For example, when three or more coordinate positions of the prism 5 are measured, the center position of a circumscribed circle of a triangle connecting the three coordinate positions may be obtained as the pile core position of the steel pipe pile P.

  Moreover, 3 A of calculating parts calculate the deviation | shift amount (difference of a coordinate) with the target value of the pile core position of the steel pipe pile P, and the said calculated pile core position. Note that the target value of the pile core position of the steel pipe pile P may be data input by the operator to the operator terminal 3 before starting the placement of the steel pipe pile P.

The storage unit 3B is realized by, for example, a semiconductor memory, a magnetic disk device, etc., and stores data and programs, and is also used as a working memory for the arithmetic unit 3A.
In the present embodiment, in the storage unit 3B, the target value of the pile core position of the steel pipe pile P, the value of the distance R and the like are stored in advance, the coordinate position of the prism 5 measured by the measuring instrument 2, It is good also as memorizing the information on the pile core position of steel pipe pile P computed by operation part 3A.

The communication unit 3C is realized by a communication interface that executes, for example, wireless communication or wired communication, and performs data communication with an external device such as the measuring instrument 2.
In the present embodiment, the communication unit 3 </ b> C performs data communication with the measuring instrument 2 and acquires information on the coordinate position of the prism 5 measured by the measuring instrument 2 from the measuring instrument 2.

  The output unit 3D is realized by, for example, a display device, and displays a deviation amount (coordinate difference) between the target value of the pile core position of the steel pipe pile P calculated by the calculation unit 3A and the calculated pile core position. Display output on the device.

  According to the construction management system 1 described above, the position of the core of the steel pipe pile P at the position of the steady member 4 close to the ground can be obtained. Thereby, it can be confirmed whether there is no problem in the position of the core of the steel pipe pile P in the vicinity of the ground.

Further, according to the construction management system 1, the prism 5 that moves around the steel pipe pile P can be reciprocated within an area that can be measured by the measuring instrument 2.
Thereby, the measuring instrument 2 can always measure the position of the prism 5. That is, according to the construction management system 1, the pile core position of the steel pipe pile P can be always grasped.

  Moreover, according to the construction management system 1, the distance between the steel pipe pile P and the prism 5 can be kept constant by providing the spacer 17 between the steel pipe pile P and the rail member 20. Thereby, the pile core position of the steel pipe pile P can be obtained with high accuracy from the position of the prism 5 measured by the measuring instrument 2.

  Moreover, according to the construction management system 1, the construction of the steel pipe pile P is planned by outputting the deviation amount between the pile core position of the steel pipe pile P under construction and the target value to the output part 3D of the operator terminal 3. You can check if it is done on the street.

[Second Embodiment]
Next, based on FIG. 11 thru | or FIG. 14, the construction management system 1A which concerns on the 2nd Embodiment of this invention is demonstrated.
In the construction management system 1A according to the second embodiment, the first prism 5A (an example of the first object) and the second prism 5B (second object) are respectively provided in the vicinity of the steadying member 4 and the drive unit 6. It differs from the construction management system 1 according to the first embodiment in that it is possible to measure both positions. The pile driver will have the same configuration.

As shown in FIG. 11, the construction management system 1A includes a position measurement jig 10A provided on the steadying member 4, an annular body 30 attached to the drive unit 6, and a position measurement jig 10A. A measuring instrument 2 for measuring the position of the first prism 5A and the second prism 5B attached to the annular body 30 and an operator terminal for calculating the position of the core of the steel pipe pile P based on the measurement result by the measuring instrument 2 3 is provided.
In the second embodiment, the angle of the measuring instrument 2 is adjusted so that both the first prism 5A and the second prism 5B can be measured.

First, the mounting structure of the second prism 5B will be described with reference to FIG. FIG. 12 shows an enlarged view of the vicinity of the drive unit 6.
As shown in FIG. 12, the annular body 30 is arranged so as to surround the drive unit 6, and the annular body 30 and the drive unit 6 are fixed by a fixing tool 31 penetrating the annular body 30. Thereby, the annular body 30 also rotates with the rotation of the drive unit 6.
Here, the second prism 5 </ b> B is fixed to the upper surface of the annular body 30. Thereby, the second prism 5 </ b> B rotates around the drive unit 6 as the drive unit 6 rotates.

Next, the configuration of the position measuring jig 10A will be described with reference to FIGS.
As shown in FIGS. 13 and 14, the position measurement jig 10 </ b> A includes a rail member 21 placed on the steadying member 4.
The rail member 21 and the steel pipe pile P are configured to maintain a constant interval by a spacer 17.

The rail member 21 is formed with a rail 21 </ b> A that goes around the steel pipe pile P.
Note that the rail 21 </ b> A is an annular rail formed so that the cross section has a substantially U-shape from the inner surface to the inside of the rail member 20. The rail 21A is provided with a magnet 16 so that the magnet 16 can slide.

The magnet 16 is a permanent magnet, and a tip portion protruding from the rail 21 </ b> A to the steel pipe pile P side is adsorbed to the side surface of the drive unit 6 by magnetic force. Therefore, the magnet 16 follows the rotation of the steel pipe pile P and slides along the rail 21A.
In the present embodiment, the steel pipe pile P is rotated clockwise in FIG. 13, and in that case, the magnet 16 is also rotated clockwise along the rail 21 </ b> A.

Here, as FIG.13 and FIG.14 shows, the 1st prism 5A and the 2nd prism 5B are arrange | positioned with respect to the pile core of the steel pipe pile P symmetrically.
By arranging the first prism 5A and the second prism 5B in this way, the measuring instrument 2 can alternately capture the positions of the first prism 5A and the second prism 5B.
That is, the measuring instrument 2 measures the position of the first prism 5A and the second prism 5B by measuring the position of the first prism 5A and the second prism 5B that is located in front of the steel pipe pile P. can do.

The measuring instrument 2 transmits the measured position coordinates of the first prism 5A and the second prism 5B to the operator terminal 3.
The calculation unit 3A of the operator terminal 3 calculates the pile core position of the steel pipe pile P in the vicinity of the steadying member 4 based on the position coordinates of the plurality of points of the first prism 5A received from the measuring instrument 2.
Similarly, the calculation unit 3A of the operator terminal 3 calculates the pile core position of the steel pipe pile P in the vicinity of the drive unit 6 based on the position coordinates of the plurality of points of the second prism 5B received from the measuring instrument 2.
The calculation unit 3A of the operator terminal 3 may identify the position coordinates of the first prism 5A and the second prism 5B based on the coordinate values in the height direction.

  The calculation unit 3A of the operator terminal 3 may calculate the amount of penetration of the steel pipe pile P into the ground based on the calculated pile core position of the steel pipe pile P in the vicinity of the drive unit 6 described above. For example, the calculation unit 3A of the operator terminal 3 may obtain a downward change amount of the steel pipe pile P calculated based on the second prism 5B as the penetration amount of the steel pipe pile P.

  Further, the calculation unit 3A of the operator terminal 3 determines the inclination of the steel pipe pile P based on the pile core position of the steel pipe pile P in the vicinity of the steadying member 4 and the pile core position of the steel pipe pile P in the vicinity of the drive unit 6. It is good also as calculating. Then, the output unit 3D of the operator terminal 3 may output the calculated inclination of the steel pipe pile P.

According to the construction management system 1A described above, the upper and lower pile core positions of the steel pipe pile P can be obtained. Thereby, the angle of the steel pipe pile P can be grasped.
Moreover, according to the construction management system 1A, the penetration amount of the steel pipe pile P into the ground can be obtained from the amount of change in the height of the pile core position of the second prism 5B.

[Appendix]
Representative embodiments of the present invention are as follows.

The construction management system according to the present invention includes a drive unit that holds an upper end portion of a steel pipe pile, press-fits the ground while rotating the steel pipe pile, and a steady member that holds the steel pipe pile near the ground. A construction management system for managing the construction work of the steel pipe pile by a pile driving machine comprising a rail member provided on the steadying member and formed with a rail around the steel pipe pile, and the steel pipe pile A rotating body that slides along the rail, a first object attached to the sliding body, a measuring instrument that measures the position of the first object, and the measuring instrument. A calculation unit that calculates a pile core position of the steel pipe pile based on a plurality of positions of the first object to be measured.
According to said construction management system, the pile core position of the steel pipe pile in the vicinity of the ground can be obtained. Thereby, it can be confirmed whether the steel pipe pile has penetrated into the ground in a correct state.

In the above construction management system, the rail member has a first rail and a second rail, and follows a rotation of the steel pipe pile and slides along the first rail. A moving body, a second sliding body that slides along the second rail following the first sliding body, and a sliding range of the second sliding body provided on the second rail A first restricting member and a second restricting member for restricting, a connecting member for connecting the second sliding body and the first restricting member and having a restoring force, the first object The object is attached to the second sliding body, and the second sliding body follows the second sliding body until reaching the second restricting member in the sliding range. After sliding along the rail and reaching the second restricting member, the connecting member restores the first Good As is the pulled back up to the vicinity of the regulating member.
By carrying out like this, the object which moves the circumference of a steel pipe pile can be reciprocated in a predetermined range, without making a steel pipe pile go around.

In the construction management system, the first sliding body and the second sliding body are both magnets, and the first sliding body attracts the steel pipe pile and follows the first sliding body. The second sliding body slides along the first rail, and the second sliding body attracts the first sliding body and slides along the second rail following the second sliding body. That's good.
By carrying out like this, the target which moves the circumference | surroundings of a steel pipe pile can be reciprocated within a predetermined range by the simple structure, without making a steel pipe pile go around.

In the above construction management system, the connection member may be an elastic member.
By doing so, the second sliding body can be pulled back to the vicinity of the first regulating member with a simple configuration.

In the construction management system, the measuring instrument may be arranged to face the sliding range.
By doing so, the measuring instrument can always measure the position of the object. Thereby, the pile core position of a steel pipe pile can always be grasped.

In the above construction management system, the first object is provided with an annular body that is attached in a state of surrounding the driving unit and rotates together with the driving unit, and a second object fixed to the annular body. And the second object are arranged symmetrically with respect to the steel pipe pile, and the measuring instrument is located on the one of the first object and the second object that is not hidden by the steel pipe pile. The calculation unit calculates a pile core position of the steel pipe pile in the vicinity of the ground based on a plurality of positions of the first object, and calculates a plurality of positions of the second object. Based on this, the pile core position of the steel pipe pile at the upper end may be calculated.
By carrying out like this, the pile core position of the upper part and lower part of a steel pipe pile can be obtained. Thereby, the penetration angle of a steel pipe pile can be grasped.
Moreover, the penetration amount to the ground of a steel pipe pile can be obtained from the pile core position of an upper end.

Said construction management system WHEREIN: It is good also as providing the spacer provided between the said steel pipe pile and the said rail member, and keeping the position of the said rail member and the said steel pipe pile constant.
By carrying out like this, the pile core position of a steel pipe pile can be obtained with sufficient accuracy from the position of an object.

Said construction management system WHEREIN: It is good also as providing the output part which outputs the deviation | shift amount of the pile core position of the said steel pipe pile calculated by the said calculating part, and a target value.
By carrying out like this, it can be confirmed whether the construction construction of the steel pipe pile is performed as planned.

In the construction management system, the first object may be a prism.
By doing so, the position of the first object can be accurately measured.

In the construction management system, the second object may be a prism.
By doing so, the position of the second object can be accurately measured.

P Steel pipe pile 1 Construction management system 1A Construction management system 2 Measuring instrument 3 Operator terminal 3A Arithmetic unit 3B Storage unit 3C Communication unit 3D Output unit 4 Stabilizing member 5 Prism 5A First prism 5B Second prism 6 Drive unit 10 For position measurement Jig 10A Position measurement jig 11 First restriction member 12 Second restriction member 13 Elastic member 15A First magnet 15B Second magnet 16 Magnet 17 Spacer 20 Rail member 20A First rail 20B Second rail 21 Rail member 21A Rail 30 Annular body 31 Fixing tool

Claims (10)

The steel pipe pile of the steel pipe pile by a pile driving machine comprising: a drive unit that holds the upper end portion of the steel pipe pile and press-fits into the ground while rotating the steel pipe pile; and a steady member that holds the steel pipe pile in the vicinity of the ground. It is a construction management system for managing the placement construction,
A rail member provided on the steadying member, and a rail member formed around the steel pipe pile; and
With the rotation of the steel pipe pile, a sliding body that slides along the rail,
A first object attached to the sliding body;
A measuring instrument for measuring the position of the first object;
A construction management system comprising: a computing unit that computes a pile core position of the steel pipe pile based on a plurality of positions of the first object measured by the measuring instrument. The rail member has a first rail and a second rail,
A first sliding body that slides along the first rail following the rotation of the steel pipe pile;
A second sliding body that slides along the second rail following the first sliding body;
A first regulating member and a second regulating member which are provided on the second rail and regulate a sliding range of the second sliding body;
A connecting member that connects the second sliding body and the first regulating member and has a restoring force;
The first object is attached to the second sliding body,
The second sliding body slides along the first rail following the second sliding body until reaching the second restricting member in the sliding range, The construction management system according to claim 1, wherein after reaching the regulating member, the construction management system is pulled back to the vicinity of the first regulating member by a restoring force of the connection member. The first sliding body and the second sliding body are both magnets,
The first sliding body attracts the steel pipe pile, slides along the first rail following the first sliding body,
The construction according to claim 2, wherein the second sliding body attracts the first sliding body and slides along the second rail following the second sliding body. Management system.   The construction management system according to claim 2, wherein the connection member is an elastic member.   The construction management system according to any one of claims 2 to 4, wherein the measuring instrument is arranged to face the sliding range. An annular body that is attached in a state of surrounding the driving unit and rotates together with the driving unit;
A second object fixed to the annular body,
The first object and the second object are arranged symmetrically with respect to the steel pipe pile,
The measuring instrument measures the position of the first object and the second object that are not hidden by the steel pipe pile,
The computing unit is
Based on the plurality of positions of the first object, calculate the pile core position of the steel pipe pile in the vicinity of the ground,
The construction management system according to claim 1, wherein a pile core position of the steel pipe pile at the upper end portion is calculated based on a plurality of positions of the second object.   The construction management system according to claim 1, further comprising a spacer that is provided between the steel pipe pile and the rail member and maintains a constant position between the rail member and the steel pipe pile.   The construction management system according to any one of claims 1 to 7, further comprising an output unit that outputs a deviation amount between a pile core position of the steel pipe pile calculated by the calculation unit and a target value.   The construction management system according to claim 1, wherein the first object is a prism.   The construction management system according to claim 6, wherein the second object is a prism.

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