CN108677638A - Express highway roadbed dam filling construction based on building waste - Google Patents

Abstract

The invention discloses a kind of express highway roadbed dam filling construction based on building waste, including step：Construction site pre-processes；Surveying and locating；Basal layer processing；Building waste pre-processes；The processing of bound edge soil water proof；Building waste is laid with and leveling；Building waste rolls；Quality testing.Present invention realization is filled to express highway roadbed in high quality using building waste; largely alleviate the problem of building waste surplus; and material for roadbed filling and method provide a reliable selection; accomplish to economize on resources more to a certain extent, environmental protection, has met the theory of sustainable development.

Description

Construction Waste Based Expressway Roadbed Filling Method

technical field

The invention relates to the field of expressway subgrade construction of civil engineering, in particular to a filling method for expressway subgrade based on construction waste.

Background technique

In recent years, with the acceleration of my country's economic development and urbanization process, the total amount of construction waste such as concrete blocks, waste bricks and muck generated in the construction, maintenance and demolition of urban infrastructure is increasing day by day. According to relevant information: at present, the amount of construction waste in my country has accounted for 30-40% of the total amount of urban waste, and the total amount of construction waste piled up in my country has reached 7 billion tons, and the annual new generation of construction waste exceeds 400 million tons. Comprehensive processing utilization is less than 5%. There are more than 600 cities in the country, and more than 400 cities are facing the phenomenon of garbage siege. It is estimated that by 2020, my country will add about 30 billion square meters of construction area. If calculated based on the waste production standard of 500-600 tons/10,000 square meters, the newly generated construction waste will be an astonishing figure. The ever-increasing construction waste is not recycled, which not only wastes a lot of natural resources, occupies a lot of production land, but also aggravates ecological pollution. Therefore, seeking a method for resource utilization of construction waste has become an urgent problem to be solved in our country.

Construction waste refers to the waste materials generated in the process of new construction, reconstruction, expansion, demolition, reinforcement of various buildings, structures, pipe networks, etc., as well as the process of residential decoration. The composition of construction waste varies with regional economic development levels, building structures, demolition and recycling methods, and usually contains soil, cement-based materials, sintered materials, natural stone, wood, metal, glass, plastic and other materials. Its performance is better than that of clay and silty soil, and it has better hardness, strength, toughness and stability.

Contents of the invention

Aiming at the serious excess of construction waste at present, combined with the excellent mechanical and engineering properties of construction waste, the present invention proposes a method of filling highway subgrade based on construction waste, so that construction waste can be recycled and reused

To achieve the above object, the technical solution of the present invention is as follows:

S1: Construction site pretreatment;

S2: measurement stakeout;

S3: Base layer processing;

S4: Construction waste pretreatment;

S5: water-proof treatment of edge-wrapping soil: use finished lime soil on both sides of the left and right panels for edge-wrapping and water-proofing;

S6: Laying and leveling of construction waste;

S7: Rolling and compacting construction waste, the specific steps are as follows:

Before rolling, calculate the amount of water M _water that needs to be supplemented by construction waste, the formula is as follows:

M _water = (W ₀ -ω ₀ )×M/(1+ω ₀ )

In the formula, W ₀ is the measured water content of construction waste, ω ₀ is the optimal water content for compaction (generally 13% ± 2%), and M is the quality of construction waste that needs to be supplemented with water;

When rolling, after adding water to the construction waste, firstly roll it with sheep feet, and when the diameter of the particles is less than 3cm, use a vibratory roller to roll it 8 to 12 times, and finally use a bare wheel roller at a speed of 1.0 to 1.4km/h. Speed rolling at least 10 times.

The step S1 of construction site pretreatment includes three parts: one is cleaning debris; the other is surface drainage; the third is site leveling.

The step S2 measures stakeout, specifically: stake out on the original ground, mark the width of the lime soil paving, and set layer level bars to control the paving thickness.

The treatment of the base layer in the step S3 specifically includes: firstly, bulldozers are used to pave the mound of the construction work surface, and then it is finely leveled with a grader, and rolled with a vibratory roller to ensure that the layer thickness is uniform.

The rolling method is as follows: from both sides to the middle, the rolling wheel tracks overlap 40-50cm at the transverse joints, and the overlapping width of the wheel tracks in the longitudinal front and rear adjacent construction sections is 100-150cm.

The step S4 of construction waste pretreatment includes two points: one is to select debris that is not suitable for filling; the other is to mechanically crush the construction waste so that the particle size after crushing is less than 25 cm.

In the step S5, the coefficient of loose paving of edge-wrapping soil is greater than 10%-20% of that of construction waste, and is 5-8cm higher than that of construction waste on the same layer.

The step S6 of laying and leveling the construction waste, specifically, divides the construction surface into a number of equal large squares, and calculates the required amount of construction waste according to the product of the filling height and area, so as to ensure that the layer thickness is even when paving Consistent; then, use an excavator for rough leveling and then use a bulldozer for fine leveling to achieve a loose pavement of 30cm.

In the step S7, the sheep foot rolling refers to rolling from both sides to the middle, the rolling speed is controlled at 2.8-3.2km/h, and the wheel tracks overlap by 0.4-0.5m.

In the step S7, the rolling method is carried out from both sides to the middle to form a 2-3% road arch cross slope; the rolling wheel tracks at the horizontal joints overlap by 40-50cm; the overlapping width of the wheel tracks in the longitudinal front and rear adjacent construction sections is 100 cm -150cm.

In the step S7, the settling plate is first installed, and then the level is placed beside the stockpiling area outside the subgrade, and the readings of the elevation values of the three types of road rollers before and after the construction waste are measured respectively. If it is less than 5 mm, it means that the subgrade filling meets the requirements, and the filling is completed. Otherwise, continue rolling with a smooth wheel roller until it meets the standard of less than 5 mm.

The method for installing the settlement plate is as follows: the construction site is divided into several sections vertically, and two pieces are installed in each section, starting from the base layer, and installed once every two layers above; Settlement measurements were carried out under pressure.

Compared with prior art, technical effect of the present invention is as follows:

1) The resource utilization of construction waste can not only solve the problem of construction waste accumulation to a great extent, but also save a lot of natural resources and a lot of production land. In addition, it also has a certain degree of economy.

2) Utilize the construction waste generated during new construction, reconstruction, expansion, and demolition, and at the same time make some improvements to the traditional filling methods, which improves the quality of the expressway roadbed and reduces the cost of the expressway.

3) It can save a lot of natural resources, free up a lot of production land, slow down the ecological pollution, and conform to the concept of sustainable development.

Description of drawings

Figure 1 is a large sample of edge-wrapped soil

Figure 2 is a schematic diagram of the number of layers of construction waste filling

Detailed ways

The present invention will be described in detail below in conjunction with specific examples. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that the drawings are all in simplified form and inaccurate proportions, and are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention.

A kind of method that the present invention proposes is used for highway subgrade filling with construction waste, comprises the following steps:

S1: Construction site pretreatment: including the following three parts: one is to clean up plastic bags, wires, weeds, household garbage and other wastes that are not suitable for roadbed filling; the other is to build temporary drainage ditches on both sides of the roadbed to remove Surface water on the ground, and prevent the surrounding water from entering the subgrade construction area; the third is to level the site, loosen 25cm and mix it with ash, and then compact it to ensure that the original ground compaction degree is not less than 90%.

S2: Measurement and stakeout; on the original ground of the subgrade that has passed the inspection, the infrared total station is used to accurately release the middle and side piles of the construction section (to ensure that the width is not less than 50cm), and the lime soil paving is clearly marked with lime lines Width, and a layer bar is set at the position of the left and right side piles to control the paving thickness.

S3: Treatment of the base layer: 40cm above the original ground is the base waterproof layer, filled in two layers, each layer 20cm. The soil mound on the construction work surface shall be paved by bulldozers and finely leveled by a grader to ensure uniform layer thickness. Firstly, the vibratory roller is used for rolling, first static pressure once, then weak vibration once, and strong vibration three times, the vibratory static pressure speed is planned to be 1.2km/h. After passing the compaction self-test, it will be collected by a rubber-tyred road roller. Rolling is carried out from both sides to the middle, the rolling wheel tracks overlap by 40-50cm at the horizontal joints, and the overlapping width of the wheel tracks in the front and rear adjacent construction sections in the longitudinal direction is 100-150cm. Rolling should ensure no pressure leakage, no dead angle, comprehensive and uniform compaction, and ensure that the compaction degree of the first layer is not less than 92%, and the compaction degree of the second layer is not less than 93%.

S4: Construction waste pretreatment: Sorting out organic waste and waste not suitable for use as roadbed filler. Use the excavator to pre-shred super-large pieces of materials, and fully shred the hollow and dense garbage such as floors. The maximum particle size of the shreds does not exceed 25cm. Manually cut off the steel bars to avoid a large number of steel bars being entangled and affecting the filling quality. Pay attention to watering and dust removal during the crushing process.

S5: Edge-wrapping soil water-proof treatment: backfill 2.5m wide (including 50 cm widening value) with 5% finished lime soil on both sides of the left and right sides to carry out edge-wrapping and water-proofing. In order to avoid the difference in elevation between the edge-wrapped soil and construction waste after rolling, the loose-spread coefficient of the edge-wrapped soil is generally 10%-20% greater than that of the construction waste. The edge-wrapping soil is pre-pressed to make it 5-8cm higher than the construction waste of the same layer, and then it is compacted synchronously with the waste brick slag filler of this layer to increase the structural integrity.

S6: Laying and leveling of construction waste; the length of this embodiment is 50m, and the width becomes narrower as the elevation increases. The compacted thickness of the filling soil is 20cm, and the loose laying thickness is about 30cm. Before laying the soil, draw a square grid of 10m (longitudinal) × (calculated width of actual elevation + 1m-2.5m)/3 (horizontal average 3 parts) with lime lines, a total of 15 squares. The compaction volume of construction waste on each floor is: 10m×(calculated width from actual elevation + 1m-2.5m)m×0.2m, and at the same time calculate the amount of brick slag required for each square, and use the transport vehicle to transport the required amount to each in the grid. When loading, make sure that the loading is closed. When loading, pay attention to controlling the amount of soil transported by each vehicle to be roughly equal; Uniform and consistent to ensure that the layer thickness can be uniform when paving. After the materials are transported, use the excavator to roughly level the filler, and then use the bulldozer to level it finely. If there are individual high piles, use manual leveling to make the surface smooth, reaching a loose layer of 30cm.

S7: Construction waste rolling: According to the compaction requirements of the subgrade, a 21t iron three-wheel road roller (the iron wheel is filled with yellow sand in advance) and a 21t sheep foot roller are combined to roll the construction waste to ensure the compaction effect and construction The leveling of the garbage surface. Table 1 is the parameter list of sheep foot mill.

Table 1: Parameter table of sheep foot mill

Before rolling, the moisture content of the construction waste is tested to control the moisture content at the optimum moisture content ± 2%. If the moisture content is too high, dry it until the moisture content meets the requirements. When the water content meets the requirements, the construction time should be shortened as much as possible to reduce the loss of water content and ensure the rolling effect. When the water content is low, use a sprinkler to add water. According to the measured water content W ₀ , the optimal water content ω ₀ for compaction, and the quality M of construction waste that needs to be supplemented with water, calculate the amount of _water that should be supplemented Mwater = (W ₀ −ω ₀ )×M/(1+ω ₀ ). When the sprinkler replenishes water, a special person is responsible to ensure that the water is evenly distributed in the construction waste.

When rolling, first use a sheep foot roller to roll, after the 6th and 10th times, use a grader for rough leveling, and after the 14th time, use a grader for fine leveling. The sheep foot mill is rolled from both sides to the middle, the rolling speed is controlled at about 3km/h, and the wheel tracks overlap by 0.4-0.5m. During the rolling process, always pay attention to the size of the particle diameter of the construction waste. If the particle diameter is found to be less than 3cm after 14 times of rolling, it can be rolled with a light wheel roller; if the particle diameter is found to be more than 3cm after 14 times, You need to continue rolling with a sheep foot roller until the diameter of the particles is below 3cm before rolling with a smooth wheel roller. After the sheep foot roller is rolled, a small amount of uncrushed reinforced concrete blocks are picked out, and they are finely leveled according to the road surface grader. Then use a vibratory roller to roll 10 times. Finally, use a slick wheel roller to roll 10 times, using 1.2km/h for rolling; the rolling speed changes from slow to fast, and the maximum speed does not exceed 4km/h; the rolling is carried out from both sides to the middle, forming a 2-3% road The arched transverse slope is good for drainage; the overlapping width of rolling wheel tracks at the horizontal joints is 40-50cm, and the overlapping width of wheel tracks in the front and rear adjacent construction sections in the longitudinal direction is 100-150cm. Rolling should ensure that there is no pressure leakage, no dead angle, and comprehensive and uniform compaction. Quality inspection is performed by sedimentation observation. The test section is divided into 5 sections on average in the longitudinal direction, and two sections are installed on each section. The installation starts from the top of the 5% lime soil of the subbase, and is installed once every two layers above. A total of 6 installations are required, and 60 settlement plates are required. When measuring, set the level meter next to the stockpiling area outside the roadbed, measure the reading before rolling, and observe the reading at all times during the rolling project. If the difference between the two readings before and after the two readings is less than 5mm, it means that the stiffness of the roadbed filler is large and stable. It has good performance and meets the requirements of roadbed filling. The difference between the readings of each point before pressure and the last reading of each point is the settlement amount.

It should be noted that the above are preferred embodiments of the present invention, and the present invention also has other implementation modes, such as changing process parameters within the scope of the present invention. This is easy to implement for construction personnel in the field.

Although the content of the present invention has been described in detail through the above embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alternatives to the present invention will be apparent to those skilled in the art after reading the foregoing. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (12)

1. A method for filling highway subgrade based on construction waste, characterized in that, the method may further comprise the steps: S1: Construction site pretreatment; S2: measurement stakeout; S3: Base layer processing; S4: Construction waste pretreatment; S5: water-proof treatment of edge-wrapping soil: use finished lime soil on both sides of the left and right panels for edge-wrapping and water-proofing; S6: Laying and leveling of construction waste; S7: Rolling and compacting construction waste, the specific steps are as follows: Before rolling, calculate the amount of water M _water that needs to be supplemented by construction waste, the formula is as follows: M _water = (W ₀ -ω ₀ )×M/(1+ω ₀ ) In the formula, W ₀ is the measured water content of construction waste, ω ₀ is the optimal water content for compaction, and M is the quality of construction waste that needs to be supplemented with water; When rolling, after adding water to the construction waste, firstly roll it with sheep feet, and when the diameter of the particles is less than 3cm, use a vibratory roller to roll it 8 to 12 times, and finally use a bare wheel roller at a speed of 1.0 to 1.4km/h. Speed rolling at least 10 times. 2. The expressway subgrade filling method based on construction waste according to claim 1, characterized in that, said step S1 construction site pretreatment includes three parts: the one is to clean up debris; the other is surface drainage; It's leveling the ground. 3. The highway subgrade filling method based on construction waste according to claim 1, characterized in that, said step S2 measures stakeout, specifically: stake out on the original ground, mark the lime soil paving width, and set layers Position bar to control pave thickness. 4. The expressway subgrade filling method based on construction waste according to claim 1, characterized in that, said step S3 base layer processing, specifically: first adopt bulldozers to pave the mound of the construction work surface, and then use The grader is fine-leveled and the vibratory roller is used for rolling. 5. The construction waste-based expressway embankment filling method according to claim 4, characterized in that, the rolling method is as follows: from both sides to the middle, and the rolling wheel tracks overlap by 40-50cm at the transverse junction, The overlapping width of the wheel tracks in the front and rear adjacent construction sections in the longitudinal direction is 100-150cm. 6. The highway subgrade filling method based on construction waste according to claim 1, characterized in that, said step S4 construction waste pretreatment includes two points: one is to select sundries that are not suitable for filling; the other is to The construction waste is mechanically crushed so that the particle size after crushing is less than 25cm. 7. The highway subgrade filling method based on construction waste according to claim 1, characterized in that, the step S5 edge-wrapping soil loose paving coefficient is greater than 10%-20% of the construction waste paving coefficient, and higher than the same Layer construction waste 5-8cm. 8. The expressway subgrade filling method based on construction waste according to claim 1, characterized in that, said step S6 construction waste is laid and leveled, specifically, the construction surface is divided into several equal large squares, and According to the product of filling height and area, calculate the amount of construction waste required to ensure that the layer thickness is uniform during paving; then, use an excavator for rough leveling and then use a bulldozer for fine leveling to achieve a loose paving of 30cm. 9. The construction waste-based expressway embankment filling method according to claim 1, characterized in that, in the step S7, the sheep foot roller refers to rolling from both sides to the middle, and the rolling speed is controlled at 2.8-3.2km /h, wheel tracks overlapping 0.4 ~ 0.5m. 10. The construction waste-based expressway subgrade filling method according to claim 1, characterized in that, in the step S7, the rolling method is carried out from both sides to the middle to form a 2-3% road crown slope ; The overlap of rolling wheel tracks at the horizontal joint is 40-50cm; the overlapping width of wheel tracks in the longitudinal front and rear adjacent construction sections is 100-150cm. 11. The highway subgrade filling method based on construction waste according to claim 1, characterized in that, in the step S7, a settling plate is first installed, and then the level is placed beside the stockpiling area outside the subgrade to measure three If the difference between the two readings before and after the construction waste is less than 5mm, it means that the subgrade filling meets the requirements and the filling is completed. Otherwise, continue rolling with the smooth roller until it meets the requirements 5 mm standard. 12. The expressway subgrade filling method based on construction waste according to claim 10, characterized in that, the method for installing the settling plate is as follows: the construction site is longitudinally divided into several sections, and each section is installed with two pieces, from The base layer is installed first, and the above two layers are installed once; after the settlement plate is installed, the settlement measurement can be carried out in the subsequent rolling.