Reinforcing structure of soft soil foundation road and construction method thereof

Abstract

The invention belongs to the technical field of soft soil foundation treatment, and discloses a soft soil foundation road reinforcing structure and a construction method thereof.The reinforcing structure comprises a plurality of cement soil mixing piles arranged in a soft soil foundation in an array mode; the multiple core piles are used for being inserted into the cement-soil mixing pile before initial setting of the cement-soil mixing pile, the multiple core piles and the multiple cement-soil mixing piles are arranged in a one-to-one correspondence mode, and each core pile comprises a pipe pile and a reinforcing piece which is filled and fixed in the pipe pile; the geogrid layer is laid on the top of the soft soil foundation and located above the multiple core pile areas, and a plurality of meshes are formed in the geogrid layer; a mattress layer; and a filler. The integrality, water stability and certain strength of the road soft soil foundation can be effectively improved, the bearing capacity and shear strength of the road subgrade are remarkably improved, meanwhile, differential settlement of the road subgrade can be effectively controlled by reinforcing the soft soil layer, and the construction quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soft soil foundation treatment, and in particular relates to a reinforcement structure of a soft soil foundation road and a construction method thereof. Background Art

[0002] Soft soil foundation is a foundation composed of soft soil layers. It has relatively large pores, high water content and low strength in its natural state. It cannot bear large loads and is prone to large deformation under the action of external loads, affecting the normal use of the road. Therefore, after road construction and rolling, the roadbed often fails to meet the quality requirements of indicators such as compaction. What is more serious is that the soft soil foundation is prone to compression during long-term use, causing uneven settlement of the road. In severe cases, it will develop into partial collapse of the road surface and a large number of cracks on the road, affecting the integrity, stability and usability of the road structure, and increasing the difficulty of later road maintenance. Therefore, we propose a reinforcement structure and construction method for soft soil foundation roads to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a reinforcement structure for a soft soil foundation road and a construction method thereof, which solves the problems of low strength, easy deformation and uneven settlement of the soft soil foundation.

[0004] The present invention is implemented by the following scheme: A reinforcement structure for a soft soil foundation road, comprising:

[0005] A plurality of cement-soil mixing piles arranged in an array in a soft soil foundation;

[0006] A core pile for inserting into the cement soil mixing pile before the cement soil mixing pile is initially set, wherein the number of the core piles is several and they are arranged one-to-one corresponding to the several cement soil mixing piles, and the core piles include a pipe pile and a reinforcing member filled and fixed in the pipe pile;

[0007] A geogrid layer is laid on the top of the soft soil foundation and is located above the core pile areas, and the geogrid layer is provided with a plurality of mesh holes;

[0008] A cushion layer, the cushion layer comprising graded crushed stone, a portion of which is filled in a plurality of meshes on the geogrid layer, and another portion of which is laid on top of the geogrid layer; and

[0009] The filling material, part of which is filled in the gaps between the graded crushed stones, and the other part is laid on the top of the cushion layer.

[0010] A further improvement of the reinforcement structure of the soft soil foundation road of the present invention is that the reinforcement member includes concrete, a support plate fixed in the pipe pile and a spiral stirrup inserted into the pipe pile and located above the support plate, and the concrete is poured in the pipe pile and wraps the spiral stirrup.

[0011] A further improvement of the reinforcement structure of the soft soil foundation road of the present invention is that a plurality of support rods are arranged at intervals on the outer peripheral surface of the support plate, and one end of the plurality of support rods is fixed to the support plate, and the other end is overlapped and fixed on the top of the pipe pile.

[0012] A further improvement of the reinforcement structure of the soft soil foundation road of the present invention is that the geogrid layer is a steel-plastic geogrid.

[0013] A further improvement of the reinforcement structure of the soft soil foundation road of the present invention is that the geogrid layer and the cushion layer are both provided in two layers, and the two cushion layers and the two geogrid layers are alternately provided.

[0014] A further improvement of the reinforcement structure of the soft soil foundation road of the present invention is that the filling material is silty clay or silty sand.

[0015] A construction method for a reinforcement structure of a soft soil foundation road comprises the following steps:

[0016] Arrange and construct a number of cement-soil mixing piles in an array in the soft soil foundation;

[0017] S2. Provide a plurality of pipe piles, and insert the plurality of pipe piles into the plurality of cement soil mixing piles one by one before the cement soil mixing piles begin to set;

[0018] S3, providing a plurality of reinforcing members, and after a plurality of cement-soil mixing piles are solidified, filling and fixing the plurality of reinforcing members into the plurality of pipe piles one by one;

[0019] S4, providing a geogrid layer, wherein the geogrid layer is provided with a plurality of mesh holes, and laying the geogrid layer on top of the cement soil mixing pile and above the plurality of pipe pile areas;

[0020] S5. providing graded crushed stone, filling a portion of the graded crushed stone into a plurality of meshes on the geogrid layer, and laying another portion of the graded crushed stone on the top of the geogrid layer to form a cushion layer;

[0021] S6. Provide filling material, fill part of the filling material into the gaps between the graded crushed stones, and lay the other part on the top of the cushion layer.

[0022] A further improvement of the construction method of the reinforcement structure of the soft soil foundation road of the present invention is that the reinforcement member comprises concrete, a support plate and spiral stirrups;

[0023] In construction step S3, the support plate is first placed in and fixed in the pipe pile, and then the spiral stirrups are inserted into the pipe pile and positioned above the support plate, and then concrete is poured into the pipe pile and wraps the spiral stirrups.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention can effectively improve the integrity, water stability and certain strength of the soft soil foundation of the road, significantly improve the bearing capacity and shear strength of the roadbed, and at the same time, by reinforcing the soft soil layer, it can effectively control the uneven settlement of the roadbed, improve the construction quality, reduce the later road maintenance costs, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The overall structural diagram of the present invention is shown.

[0027] Figure 2 The present invention is shown Figure 1 Enlarged schematic diagram at point A in the middle.

[0028] Figure 3 A schematic diagram of the mesh structure of the present invention is shown.

[0029] Figure 4 A schematic diagram of the core pile structure of the present invention is shown.

[0030] Figure 5 The schematic diagram of the structure of the support plate frame of the present invention is shown.

[0031] In the figure: 1. Cement soil mixing pile; 2. Core pile; 201. Pipe pile; 202. Support plate; 203. Support rod; 204. Spiral stirrup; 205. Concrete; 3. Cushion layer; 4. Filling material; 5. Road surface layer; 6. Geogrid layer; 601. Mesh; 7. Soft soil foundation. DETAILED DESCRIPTION

[0032] In order to solve the problems of low strength, easy deformation and uneven settlement of soft soil foundation, the present invention provides a reinforcement structure of soft soil foundation road and its construction method. The reinforcement structure of soft soil foundation road and its construction method are further described below with specific embodiments and drawings.

[0033] See also Figure 1 to Figure 5 As shown, a reinforcement structure for a soft soil foundation road comprises:

[0034] A plurality of cement-soil mixing piles 1 arranged in an array in a soft soil foundation 7;

[0035] A core pile 2 is used to be inserted into the cement soil mixing pile 1 before the cement soil mixing pile 1 is initially set. The number of core piles 2 is several and they are arranged one by one corresponding to the several cement soil mixing piles 1. The core pile 2 includes a pipe pile 201 and a reinforcing member filled and fixed in the pipe pile 201;

[0036] The geogrid layer 6 is laid on the top of the soft soil foundation 7 and is located above the area of ​​the core piles 2. The geogrid layer 6 is provided with a plurality of mesh holes 601;

[0037] A cushion layer 3, the cushion layer 3 comprises graded crushed stone, a part of which is filled in a plurality of meshes 601 on the geogrid layer 6, and another part of which is laid on the top of the geogrid layer 6; and

[0038] A part of the filling material 4 is filled in the gaps between the graded crushed stones, and the other part is laid on the top of the cushion layer 3.

[0039] By inserting the core pile 2 into the cement soil mixing pile 1 and anchoring the solidified cement soil mixing pile 1 and the core pile 2 to each other, the strength and stability of the pile body and the overall later bearing capacity are ensured, and the strength and stability of the soft soil foundation 7 are also improved. By laying the geogrid layer 6 and the cushion layer 3 on the top of the soft soil foundation 7, the load of the roadbed superstructure can be more widely dispersed into the soil, reducing the pressure per unit area of ​​the soil, improving the soil performance, and improving the overall stiffness and stability of the foundation.

[0040] The reinforcement member includes concrete 205 , a support plate 202 fixed in the pipe pile 201 , and a spiral stirrup 204 inserted into the pipe pile 201 and located above the support plate 202 . The concrete 205 is poured in the pipe pile 201 and wraps the spiral stirrup 204 .

[0041] A plurality of supporting rods 203 are arranged at intervals on the outer circumference of the supporting plate 202 , and one end of each of the supporting rods 203 is fixed to the supporting plate 202 , and the other end of each of the supporting rods 203 is overlapped and fixed on the top of the pipe pile 201 .

[0042] By placing a steel support plate 202, spiral stirrups 204, and core sealing in the pipe pile 201 after the head of the core pile 2 is dug out, the friction and adhesion in the pipe pile 201 are improved, ensuring the strength and stability of the pile body and the overall later bearing capacity of the composite pile composed of the cement-soil mixing pile 1 and the core pile 2; specifically, the position where the support plate is set should meet the stability requirements of the core pile structure to be formed, and it is not necessary to set it at the bottom of the pipe pile, which can save costs.

[0043] Among them, the geogrid layer 6 is a steel-plastic geogrid.

[0044] Specifically, the steel-plastic geogrid is made of cold-drawn carbon spring steel wire, polyethylene and other high molecular polymers as the main raw materials, adding a certain amount of anti-ultraviolet, anti-aging additives and other reinforcing and modified substances, and the steel-plastic composite strips are extruded and compounded in the warp and weft directions as a whole, and the overall strength is good.

[0045] The geogrid layer 6 and the cushion layer 3 are both arranged in two layers, and the two layers of the cushion layer 3 and the two layers of the geogrid layer 6 are arranged alternately.

[0046] By laying two layers of geogrid layers 6 and cushion layers 3 on the soft soil foundation 7 of the road, the load of the roadbed superstructure can be more widely dispersed into the soil, reducing the pressure per unit area of ​​the soil, improving the soil performance, and increasing the overall stiffness and stability of the foundation.

[0047] The filler 4 is silty clay or silty sand.

[0048] Specifically, a road surface layer 5 is constructed on the top of the filling material 4; silty clay or silt sand is used as backfill material, which can be well filled in the gaps of graded gravel, thereby improving the overall strength of the cushion layer 3, improving the strength of the roadbed, and effectively controlling the uneven settlement of the roadbed.

[0049] A construction method for a reinforcement structure of a soft soil foundation road comprises the following steps:

[0050] S1, laying out a plurality of cement-soil mixing piles 1 in an array in the soft soil foundation 7;

[0051] S2, providing a plurality of pipe piles 201, and inserting the plurality of pipe piles 201 into the plurality of cement-soil mixing piles 1 one by one before the cement-soil mixing piles 1 begin to set;

[0052] S3, providing a plurality of reinforcing members, and after the plurality of cement-soil mixing piles 1 are solidified, filling and fixing the plurality of reinforcing members one by one into the plurality of pipe piles 201;

[0053] S4, providing a geogrid layer 6, on which a plurality of mesh holes 601 are arranged, and laying the geogrid layer 6 on the top of the cement-soil mixing pile 1 and above the area of ​​the plurality of pipe piles 201;

[0054] S5, providing graded crushed stone, filling part of the graded crushed stone into a plurality of meshes 601 on the geogrid layer 6, and laying the other part on the top of the geogrid layer 6 to form a cushion layer 3;

[0055] S6, providing filler 4, filling part of the filler 4 into the gaps between the graded crushed stones, and laying the other part on the top of the mattress layer 3;

[0056] S7, constructing the road surface layer 5 on the top of the filling material 4.

[0057] The reinforcement member includes concrete 205, support plate 202 and spiral stirrups 204;

[0058] In construction step S3 , the support plate 202 is first placed and fixed in the pipe pile 201 , and then the spiral stirrups 204 are inserted into the pipe pile 201 and positioned above the support plate 202 . Then, concrete 205 is poured into the pipe pile 201 and wraps the spiral stirrups 204 .

[0059] Wherein, the geogrid layer 6 and the cushion layer 3 are both set as two layers;

[0060] After completing step S5, provide another layer of geogrid layer 6 and graded crushed stone. First, lay the geogrid layer 6 on the cushion layer 3, then fill part of the graded crushed stone into several mesh holes 601 on the geogrid layer 6, and lay the other part on the top of the geogrid layer 6 to form a second cushion layer 3, so as to realize alternating arrangement of two cushion layers 3 and two geogrid layers 6.

[0061] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0062] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A reinforcement structure for a soft soil foundation road, characterized in that: include: A plurality of cement-soil mixing piles arranged in an array in a soft soil foundation; A core pile for inserting into the cement soil mixing pile before the cement soil mixing pile is initially set, wherein the number of the core piles is several and they are arranged one-to-one corresponding to the several cement soil mixing piles, and the core piles include a pipe pile and a reinforcing member filled and fixed in the pipe pile; A geogrid layer is laid on the top of the soft soil foundation and is located above the core pile areas, and the geogrid layer is provided with a plurality of mesh holes; A cushion layer, the cushion layer comprising graded crushed stone, a part of which is filled in a plurality of meshes on the geogrid layer, and another part of which is laid on the top of the geogrid layer; as well as The filling material, part of which is filled in the gaps between the graded crushed stones, and the other part is laid on the top of the cushion layer.

2. The reinforcement structure for a soft soil foundation road according to claim 1, characterized in that: The reinforcement member comprises concrete, a supporting plate fixed in the pipe pile and a spiral stirrup inserted into the pipe pile and located above the supporting plate. The concrete is poured in the pipe pile and wraps the spiral stirrup.

3. The reinforcement structure for a soft soil foundation road according to claim 2, characterized in that: A plurality of supporting rods are arranged at intervals on the outer peripheral surface of the supporting plate, and one end of each of the supporting rods is fixed to the supporting plate, and the other end of each of the supporting rods is overlapped and fixed on the top of the pipe pile.

4. The reinforcement structure for a soft soil foundation road according to claim 1, characterized in that: The geogrid layer is a steel-plastic geogrid.

5. The reinforcement structure for a soft soil foundation road according to claim 1, characterized in that: The geogrid layer and the cushion layer are both arranged in two layers, and the two cushion layers and the two geogrid layers are arranged alternately.

6. The reinforcement structure for a soft soil foundation road according to claim 1, characterized in that: The filler is silty clay or silt sand.

7. A construction method for reinforcing a soft soil foundation road structure, characterized in that: The steps include: S1. Arrange and construct a number of cement-soil mixing piles in an array in the soft soil foundation; S2. Provide a plurality of pipe piles, and insert the plurality of pipe piles into the plurality of cement soil mixing piles one by one before the cement soil mixing piles begin to set; S3, providing a plurality of reinforcing members, and after a plurality of cement-soil mixing piles are solidified, filling and fixing the plurality of reinforcing members into the plurality of pipe piles one by one; S4, providing a geogrid layer, wherein the geogrid layer is provided with a plurality of mesh holes, and laying the geogrid layer on top of the cement soil mixing pile and above the plurality of pipe pile areas; S5. providing graded crushed stone, filling a portion of the graded crushed stone into a plurality of meshes on the geogrid layer, and laying another portion of the graded crushed stone on the top of the geogrid layer to form a cushion layer; S6. Provide filling material, fill part of the filling material into the gaps between the graded crushed stones, and lay the other part on the top of the cushion layer.

8. The construction method of the reinforcement structure of the soft soil foundation road according to claim 7, characterized in that: The reinforcement member includes concrete, a support plate and spiral stirrups; In construction step S3, the support plate is first placed in and fixed in the pipe pile, and then the spiral stirrups are inserted into the pipe pile and positioned above the support plate, and then concrete is poured into the pipe pile and wraps the spiral stirrups.

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