JPH04185814A - Construction of structural core column - Google Patents

Abstract

PURPOSE:To adjust very exactly the vertical and horizontal accuracies of a structural column by a method in which an excavated pit is filled with mud water to stabilize the wall of the pit, and a structural core column is hung up by excavator and guided to the opening edge of the pit while stabilizing its upper end side. CONSTITUTION:An excavator 2 is set on a place where a structural core column 1 is to be set, and a guider 3 is fixed. The support column 4 of the excavator 2 is vertically held by adjusting a support rod 5 to hang an auger rod 6 up. The rod 6 is guided to the column 4 by a driver 7 while being turned and lowered to the guider 3 to start up excavation. Excavation is made while jetting pressure water from the tip of the rod 6, excavated soil is stirred by a agitating rod 11, and an adequate amount of cement milk is injected to the bottom of the pit. The rod 6 is then pulled up, the column 1 is hung up and set vertically, and the upper end of the column 1 is fixed after setting by means of jack 20 while adjusting the vertical accuracy(level) by expanding or contracting the rod of the jack 20. The hanging and setting operations of the column 1 can be exactly made.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing structural pillars in foundation work at a construction site.

(Prior Art) Conventionally, when constructing a building, a reverse construction method using structural pillars, etc. has been known in order to allow underground construction and above-ground construction to proceed simultaneously. The construction methods for the structural pillars are based on the following three methods.

■ Earth drilling method in which drilled holes are dug in batches, the soil is discharged to the outside world, and a stabilizing liquid is injected into the hole ■ Reverse method in which the excavated soil is drained as muddy water and the drilled hole is filled with thin muddy water ■ Casing Benoto construction method (problem to be solved by invention) in which the soil inside the casing is excavated and removed in packets (forming a hollow trench) (problem to be solved by the invention). Not only does it require processing costs, labor, and time, but
In order to secure the hole walls by injecting stabilizing liquid, there was a problem in that it was necessary to dispose of excess stabilizing liquid as the structural pillars were raised.

In addition, the river construction method had the problem of requiring equipment to treat a huge amount of muddy water since the excavated soil was turned into muddy water and discharged.

Next, the Benoto construction method required a casing, which not only required extra work to insert or remove, but also required a huge amount of soil removal.

In each of the above construction methods, after the structural pillars are erected, it is necessary to backfill with sand or the like in order to stabilize the structural pillars. Therefore, there is a risk that the vertical accuracy will be lost when backfilling, making it difficult to maintain high accuracy.

When drilling holes are created using each of the above construction methods, there is less foreign matter (soil, sand, gravel, etc.) in the holes, so the vertical accuracy of the structural pillars can be maintained even when they are lifted with a crane. However, there was a risk that it would go awry during backfilling.

(Means for Solving the Problems) However, in this invention, the excavated soil is turned into mud and kneaded into the wall of the excavation hole, and the hole is filled with muddy water to stabilize the hole wall, and the structural pillars are removed using an excavator. The above-mentioned conventional method can be improved by hoisting the structure pillar, holding the upper end side of the structure pillar, and then providing a guide for the structure pillar at the opening edge of the excavation hole to highly accurately adjust the vertical accuracy and horizontal accuracy of the structure pillar. It solved the problem.

That is, this invention provides a method for forming a predetermined excavation hole at a predetermined location on the site through an excavation means that turns the excavated soil into mud and kneading it onto the wall of the excavation hole, and installing a guide means for a structural pillar at the upper end of the excavation hole. At the same time, the structural pillar is suspended by the structural pillar hanging means, and the structural pillar is corrected vertically by the guiding means of the structural pillar and the hanging means, and is suspended to a predetermined depth. If so, this is a construction method for structural pillars characterized by erection via temporary support means after final vertical correction. Further, the excavation means rotates the auger rod to form an excavation hole of a predetermined diameter with the auger, stirs the excavated soil with a stirring rod provided in the auger lot, and turns the excavated soil into mud with a kneading drum provided in the auger lot. This method is characterized by compacting and kneading excavated soil that has turned into mud into the walls of the borehole. Further, since the hole is filled with muddy water having a specific gravity of about 1.3 to 1.5, the hole wall can be stabilized. Next, the guide means is a casing with an adjustment means installed at the mouth edge of the excavation hole.

Furthermore, the hanging means is characterized in that a connecting means for restraining the horizontal direction is interposed between the hanging means of the pile driver and the upper end of the structure column.

The temporary support means in this invention includes a temporary support pedestal and a means for adjusting the inclination of the pedestal. Further, the casing adjustment means is such that a casing bracket is set on the casing frame and is installed so as to be movable back and forth and left and right. Next, the hanging means of the pile driver is composed of a hanging rod having a fitting portion at the lower end with the upper end of the structural column, and a hanging wire provided on the hanging rod.

The connecting means in the second invention includes a fitting hole provided at the lower end of the suspension rod, a fitting protrusion that fits into the fitting hole provided at the upper end of the structure column, and a fitting protrusion fitted to the outside of the fitting part. It is constructed with a fixed collar. Further, the inclination adjustment means is a plurality of jacks that support the temporary support frame.

As mentioned above, in the method of kneading the excavated soil into the walls of the borehole, the amount of excavated soil is drastically reduced, so the time and labor required for soil removal can be significantly reduced, and the consolidation of the walls of the borehole can be strengthened. There is no risk of the borehole wall collapsing during excavation or when the structural pillars are suspended. In addition, muddy water with a relatively high specific gravity remains in the drill hole after the auger rod is pulled out, and the drill hole is held stably, so there is no need to use stabilizing fluid for maintaining the drill hole, and therefore it is stable. Liquid replacement or purification treatment is also unnecessary. Therefore, as for on-site treatment, only a small amount of drainage water during excavation and the discharged mud water corresponding to the volume of the structural pillars are treated.Compared to the treatment of all excavated soil and replacement liquid in conventional construction methods, This not only saves time, labor, and cost, but also has the advantage of shortening the construction period.

Furthermore, according to the conventional construction method, after the structural pillars are erected, backfilling is performed to ensure stability, but the vertical accuracy is likely to be lost during this backfilling process. However, since this invention does not require backfilling,
There is no risk of losing accuracy after construction.

Furthermore, since the structural pillars are suspended while being adjusted, the accuracy is high, and the structural pillars can be used as they are as the pillar core of a building.

(Function) According to the present invention, the excavated soil is treated by being mixed into the wall of the excavation hole, so that the amount of excavated waste can be significantly reduced. In addition, the walls of the excavation hole become solid and can stably hold the excavation hole until the suspension of the structural column is completed, and there is no risk of problems (such as peeling off of the excavated hole wall) when lifting the structural column. do not have.

Furthermore, since the structural pillar is suspended by an excavator, the upper end of the structural pillar can be securely held. Therefore, in conjunction with a guide hardware for the structural pillar provided at the mouth edge of the excavation hole, the structural pillar can be suspended while being corrected vertically. Therefore, when suspending the structural pillars, it is possible to perform highly accurate adjustment, and the suspension can be carried out accurately with a simple device by making full use of the adjustment means without requiring a skilled suspension technique.

(Example 1) Embodiments of the invention will be described based on the drawings.

FIGS. 1 to 4 show the order of drilling the boreholes.

That is, after installing the excavator 2 at the planned installation position of the structural pillar 1 and fixing the guide means 3, excavation is started in the usual manner. That is, a guide tube 13 is installed as the guide means 3 at the mouth edge of the excavated hole 10. The guide tube 13 is supported on one side of the support 14 via an adjusting arm 15.15. Furthermore, a footboard 16 is installed on the other side of the support base 14 so that it can be attached to the ground.

The step board 16 is provided to be stepped on by the caterpillar 17 of the excavator 2 and to fix the abutment 14 in the current position (11th
Fig. 12). In the above, the directions of arrows 22 and 23 are adjusted by adjusting arms 15 and 15, and the directions of arrows 24 and 25 are adjusted by jacks 26.

In addition, the support base 14 is firmly fixed by driving a bolt in a proper place. First, the support column 4 of the excavator 2 is held vertically by adjusting the support rod 5, and the auger rod 6 is lifted as shown in FIG. Next, the drilling rod 6 is rotated by the drive device 7, guided by the support column 4, and lowered as shown by arrow 8 in FIG. 1, and digging is started while the auger 9 is guided by the guide means 3. . As the excavation work progresses, as the excavation hole becomes deeper as shown in Fig. 2, the excavated soil is turned into mud by the stirring rod 11 of the auger rod 6 (pressurized water is spouted during excavation), and then the auger rod 6 Using the kneading drum 12, the muddy excavated soil is kneaded as much as possible onto the inner wall surface of the excavated hole 1o. In this way, the excavated hole 1o is excavated to a predetermined depth. When excavating the borehole 10, pressurized water is usually spouted from the tip of the auger rod 6 while excavating, so the excavated soil is turned into mud by the stirring rod 1 and is easily kneaded by the rotation and descent of the kneading drum 12. Then, an appropriate amount of cement milk is injected into the bottom of the borehole. Then Ocher Lot 6
Lift it up and replace it with the structure pillar 1 (Figure 5).

Next, remove the cage] and ri, install the structural pillar guide,
Then, operate the excavator 2 and gradually suspend the structure pillar 1.
The lower end is aligned with the structural pillar guide, and the angle of the supporting pillar 4 is adjusted by operating the support rod 5, and erection is started while maintaining the structural pillar 1 vertically.

In this case, for example, an inclinometer is attached to the upper end of the structural pillar 1, and its output is used as a measuring device to detect the inclination of the structural pillar 1, and this is used to control the vertical direction of the structural pillar. However, if construction continues, it will be possible to maintain the vertical alignment with high accuracy.

After completing the erection as shown in Figure 8, the upper end of the structural pillar 1 is fixed. In this case, as shown in FIG. 9 and FIG. 20.20 is inserted, and the vertical accuracy (level) of the structural pillar 1 is adjusted by expanding and contracting the rod of the jack 20. Cement milk 21 is injected into the bottom of the excavation hole 10, so if the structural pillar 1 is inserted into this cement milk 21 and the cement milk 21 is hardened, the structural pillar] will be hardened and vertical. Fixation can be done simultaneously.

Next, the drive device 7 and the structural column 1 can be connected, for example, as shown in FIGS. 13 and 14.

That is, the upper end of the connecting shaft 29 is connected to the shaft 27 of the drive device 7 via the flange 28, the bracket 30 is diametrically fixed to the upper part of the connecting shaft 29, and the wire 32 is connected to the bracket 30 via the turnbuckle 31. and wire 32
The suspension ring 33 of the structural pillar 1 is connected to the lower end of the structure pillar 1. Further, a fitting recess 34 is provided at the lower end of the connecting shaft 2'9, and a fitting recess 34 is provided at the lower end of the connecting shaft 2'9.
A shaft rod 35 having a fitting convex portion is fixed at the center of the upper end. Therefore, the structural pillar 1 is lifted up, the lower end of the connecting shaft 29 and the upper end of the shaft rod 35 are fitted, and the connecting shaft 2 is inserted into the fitting part.
By fitting the collar 36 to the fitting 9, the connecting portion can be secured in a straight line.

The collar 36 is hooked to a hook 37 rotatably attached to the connecting shaft 29, and the lobe 38 is
By pulling in the direction of the flange 40 of the collar 36
The collar 36 is unlatched, and the collar 36 is lowered by its own weight as shown by the arrow 41 and fitted into the connecting portion. In the figure, 42 is a hanging wire for the collar 36, 43 is a stopper for the collar 36, and 4
4 is a return spring for the hook piece 37. According to the above-described connecting means, the connecting shaft 29 and the shaft rod can be rigidly connected in a direction parallel to the central axis. Therefore, by adjusting the inclination of the support column of the excavator, the verticality of the structural column 1 can be adjusted. Although there are various structures for the guide means and the connecting means, any structure can be adopted as long as the verticality of the structural column can be adjusted.

(Effects of the Invention) According to this invention, when a borehole is excavated, the excavated surface is turned into mud and is kneaded into the borehole wall, so that not only the amount of soil discharged during excavation is drastically reduced, but also the borehole wall is strengthened. [7] It has the effect of preventing the flaking and reducing the construction period and cost. Additionally, when installing the structural pillars, an excavator was used to rigidly connect the upper parts of the structural pillars, and a guiding means was inserted at the mouth of the excavation hole, so the structural pillars could be adjusted while It has the effect of maintaining highly accurate verticality. Further, according to the present invention, there is no need for backfilling after erection, which was required in the conventional construction method, so there is no risk that the vertical accuracy will be lost during backfilling. Furthermore, since the retaining fluid from the excavation hole is not used, there are various advantages such as there is no need to treat the retaining fluid, less muddy water treatment is required, and the entire construction can be carried out using simple equipment.

[Brief explanation of drawings]

Figures 1 to 4 are diagrams showing the process of drilling a borehole.
The figure shows the start of excavation, the second figure shows intermediate excavation, and the third figure shows the end of excavation.
FIG. 4 shows the state when the auger rod is pulled up. Figures 5 to 8 are diagrams showing the construction of the structural pillars. Figure 5 shows the completion of preparation, Figure 6 shows the start of construction, Figure 7 shows the middle of construction, and Figure 8 shows the completion of construction. FIG. FIG. 9 is an enlarged partial cross-sectional view showing the final adjustment of the structural column just before the completion of erection according to the present invention, FIG. 10 is an enlarged plan view, and FIG. 11 is an enlarged plan view of the guide means during excavation. FIG. 12 is an enlarged side view, FIG. 13 is a partially enlarged front view of the structural column coupling device, and FIG. 14 is a partially enlarged side view. 1... Structural pillar 2... Excavator 3... Guide means 4... Support column 5... Support rod
6... Auger rod 7... Drive device
9...Auger 10...Drilling hole 13
... Guide cylinder 14 ... Abutment 16 ... Step board 18 ... Beam material 20 ... Jacket 21
... Cement milk 2 ... Connecting shaft 35 ... Shaft rod 36 ... Color patent applicant Mitani Seksan Co., Ltd.

Claims (1)

[Scope of Claims] 1. A predetermined excavation hole is provided at a predetermined position on the site through an excavation means that turns the excavated soil into mud and kneads it onto the wall of the excavation hole, and a guide means for a structural pillar is provided at the upper end of the excavation hole. At the same time, the structural pillar is suspended by the structural pillar's hanging means, and the structural pillar is vertically corrected by the guiding means of the structural pillar and the hanging means, and the structural pillar is suspended to a predetermined depth. Construction method 2 for structural pillars, which is characterized in that once it has been suspended, it is erected via temporary support means after a final extension correction. A stirring rod provided on an auger rod is used to stir the excavated soil into mud, and a kneading drum provided on the auger rod is used to compact and knead the excavated soil into the wall of the excavation hole. 3. A method for constructing a structural pillar according to claim 1, wherein the guiding means is a casing with an adjustment means installed at the edge of the excavation hole. A method for constructing a structural pillar according to claim 1, characterized in that a connecting means for restraining the horizontal direction is interposed between the hanging means and the upper end of the structural pillar. 6. The method for constructing a structural pillar according to claim 1, wherein the casing adjustment means is a casing bracket installed on the casing frame so as to be movable back and forth and left and right. Construction method 7 of the structure column according to claim 4, wherein the hanging means of the pile driver is constituted by a hanging rod having a fitting part with the upper end of the structure column at the lower end, and a hanging wire provided on the hanging rod. Construction method 8 The connection means is a fitting hole provided at the lower end of the hanging rod,
A construction method for a structural pillar according to claim 4, wherein the structural pillar is constructed of a fitting protrusion that fits into the fitting hole installed at the upper end of the structural pillar, and a fixing collar that fits on the outside of the fitting part. The method for constructing a structural pillar according to claim 5, wherein the adjustment means is a plurality of jacks that support the temporary support frame.