A structure suitable for red layer soft rock foundation pit support

Abstract

The utility model discloses a structure suitable for red layer soft rock foundation pit support, including the concrete foundation, the concrete foundation sets up at the bottom end of foundation pit, the periphery of concrete foundation all is provided with support mechanism, the support mechanism includes support stake, the one side of support mechanism is provided with drainage mechanism, the utility model relates to the technical field of foundation pit support, this structure suitable for red layer soft rock foundation pit support realizes the overall water -permeable geotextile and realizes the comprehensive coverage of the slope between support stake, solves the problem of traditional partial drainage blind area, effectively intercepts loose rock and soil particle, the protective shell is formed to reinforced mesh and shotcrete layer, avoids the damage of geotextile in construction, strengthens the surface of slope anti -scouring capacity simultaneously, the three -dimensional drainage network is formed to drainage anchor pipe and drainage blind pipe combination, and the drainage range covers the whole slope, and the long -term stability of foundation pit support structure is greatly improved through this drainage mechanism.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, specifically a structure suitable for foundation pit support in red bed soft rock. Background Technology

[0002] Red bed soft rock is a special type of rock widely distributed in my country, with large outcrops found in areas such as Chuxiong and Yuanmou in Yunnan Province, as well as Sichuan and Gansu Province. Its formation mainly stems from terrestrial sedimentary environments during the Mesozoic to Cenozoic eras. It exhibits a predominantly red color and is primarily composed of sandstone, siltstone, and mudstone, often accompanied by marl and conglomerate, and typically consists of alternating layers of hard and soft rocks.

[0003] In existing technologies, traditional support piles can only provide lateral support and cannot solve the problem of soil and water loss between piles and behind the slope; conventional drainage blind pipes are mostly arranged locally, with limited drainage range, and are easily blocked by lost mud particles, leading to drainage failure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a structure suitable for the support of foundation pits in red bed soft rock, thus solving the aforementioned problems.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a structure suitable for the support of foundation pits in red bed soft rock, including a concrete foundation, wherein the concrete foundation is set at the bottom of the foundation pit, and a support mechanism is set around the concrete foundation, wherein the support mechanism includes support piles, and a drainage mechanism is set on one side of the support mechanism. The drainage mechanism includes an integral permeable geotextile, a drainage blind pipe, and a drainage anchor pipe. The drainage mechanism is used to prevent the two sections of support piles and the soft red rock soil behind them from being washed away and softened by water.

[0006] Preferably, the permeable geotextile is laid on the red soft rock soil between the two sections of the support piles; A steel mesh is fixedly laid on the side of the integral permeable geotextile near the foundation pit, and a shotcrete layer is fixedly installed on the surface of the steel mesh. The drainage blind pipe is vertically installed between the integral permeable geotextile and the steel mesh. The bottom end of the drainage blind pipe is vertically connected to a blind pipe drainage outlet, and the blind pipe drainage outlet penetrates the shotcrete layer and extends outward.

[0007] Preferably, the drainage anchor pipe penetrates the shotcrete layer, the integral permeable geotextile, and extends into the soil layer behind the integral permeable geotextile, and an anchor pipe water collection pipe is fixedly installed at the outlet of the drainage anchor pipe.

[0008] Preferably, the surfaces of the drainage blind pipe and the drainage anchor pipe are fixedly provided with permeable geotextile, and the surfaces of the drainage blind pipe and the drainage anchor pipe are provided with permeable holes. The gap between the drainage anchor pipe and the soil layer is filled with a coarse sand filter layer.

[0009] Preferably, the support piles are vertically installed and penetrate deep into the soil layer. There are multiple support piles, and a capping beam is fixedly connected to the top of the side of the support pile facing the foundation pit. The capping beam connects the tops of all the support piles.

[0010] Preferably, a waist beam is fixedly connected to the middle of the side of the support pile facing the foundation pit, and the waist beam also connects all the support piles.

[0011] Preferably, the support mechanism further includes an anchor cable, which extends into the soil layer behind the support pile and is set at a 20° angle with the support pile. The end of the anchor cable away from the soil layer passes through the support pile and is fixedly connected to the waist beam. Cement grout is poured into the gap between the anchor cable and the soil layer. The concrete foundation is surrounded by foundation drainage ditches.

[0012] Beneficial effects This invention provides a structure suitable for foundation pit support in red bed soft rock. Compared with the prior art, it has the following advantages: This structure, suitable for foundation pit support in red bed soft rock, achieves full coverage of the slope between support piles through an integral permeable geotextile, solving the blind spot problem of traditional local drainage and effectively intercepting loose soil and rock particles. The steel mesh and shotcrete layer form a protective shell to prevent the geotextile from being damaged during construction, while enhancing the slope surface's resistance to erosion. The combination of drainage anchor pipes and drainage blind pipes forms a three-dimensional drainage network, covering the entire slope. This drainage mechanism significantly improves the long-term stability of the foundation pit support structure. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the support mechanism structure of this utility model; Figure 3 This is a top view of the drainage mechanism of this utility model; Figure 4 This is a cross-sectional structural diagram of the drainage blind pipe and drainage anchor pipe of this utility model.

[0014] In the diagram: 1. Concrete foundation; 11. Foundation drainage ditch; 2. Support structure; 21. Support pile; 22. Crown beam; 23. Waist beam; 24. Anchor cable; 25. Cement grouting; 3. Drainage mechanism; 31. Integral permeable geotextile; 32. Drainage blind pipe; 33. Permeable geotextile; 34. Permeable hole; 35. Steel mesh; 36. Shotcrete layer; 37. Blind pipe drainage outlet; 38. Drainage anchor pipe; 39. Coarse sand filter layer; 310. Anchor pipe water collection pipe. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1: Please see Figure 1-4 A structure suitable for the support of foundation pits in red bed soft rock includes a concrete foundation 1, which is set at the bottom of the foundation pit. Support mechanisms 2 are set around the concrete foundation 1. The support mechanisms 2 include support piles 21. A drainage mechanism 3 is set on one side of the support mechanism 2. The drainage mechanism 3 includes an integral permeable geotextile 31, a drainage blind pipe 32, and a drainage anchor pipe 38. The drainage mechanism 3 is used to prevent the two sections of support piles 21 and the soft red rock soil behind them from being washed away and softened by water.

[0017] The permeable geotextile 31 is laid on the red soft rock soil between the two sections of support piles 21; A steel mesh 35 is fixedly laid on the side of the permeable geotextile 31 near the foundation pit. A shotcrete layer 36 is fixedly installed on the surface of the steel mesh 35. A drainage blind pipe 32 is vertically installed between the permeable geotextile 31 and the steel mesh 35. The bottom end of the drainage blind pipe 32 is vertically connected to a blind pipe drainage outlet 37. The blind pipe drainage outlet 37 penetrates the shotcrete layer 36 and extends outward.

[0018] The drainage anchor pipe 38 penetrates the shotcrete layer 36 and the integral permeable geotextile 31 and extends into the soil layer behind the integral permeable geotextile 31. The outlet of the drainage anchor pipe 38 is fixedly installed with an anchor pipe water collection pipe 310.

[0019] The surfaces of the drainage blind pipe 32 and the drainage anchor pipe 38 are both fixedly provided with permeable geotextile 33, and the surfaces of the drainage blind pipe 32 and the drainage anchor pipe 38 are both provided with permeable holes 34. The gap between the drainage anchor pipe 38 and the soil layer is filled with a coarse sand filter layer 39.

[0020] The support piles 21 are vertically installed and penetrate deep into the soil layer. There are multiple support piles 21. The top of the side of the support pile 21 facing the foundation pit is fixedly connected to the capping beam 22, which connects the top of all the support piles 21.

[0021] A waist beam 23 is fixedly connected to the middle of the side of the support pile 21 facing the foundation pit, and the waist beam 23 is also connected to all the support piles 21.

[0022] The support mechanism 2 also includes an anchor cable 24. The anchor cable 24 extends into the soil layer behind the support pile 21 and is set at a 20° angle with the support pile 21. The end of the anchor cable 24 away from the soil layer passes through the support pile 21 and is fixedly connected to the waist beam 23. Cement grout 25 is poured into the gap between the anchor cable 24 and the soil layer. Drainage ditches 11 are provided around the concrete foundation 1.

[0023] In this embodiment, after the foundation pit is excavated, a concrete foundation 1 and a foundation drainage ditch 11 are first poured to form a bottom waterproof bearing layer; then the support piles 21, the cap beam 22 and the waist beam 23 are constructed, and a lateral support system is formed with the stable soil layer behind through the anchor cable 24 to resist the lateral pressure of the foundation pit soil. A permeable geotextile 31 is laid in the gap between the support piles 21 to intercept loose particles on the red bed soft rock slope. When rainwater or groundwater seeps in, the water flows through the permeable geotextile 31 and enters the drainage blind pipe 32. The permeable holes 34 and the permeable geotextile 33 further prevent particles from entering the pipe. The collected water flows into the foundation drainage ditch 11 through the drainage outlet 37 of the blind pipe. The water inside the foundation drainage ditch 11 can be discharged by the drainage pump. The shotcrete layer 36 and the steel mesh 35 jointly protect the permeable geotextile 31 to avoid construction damage and enhance the integrity of the slope surface. The drainage anchor pipe 38 extends into the soil layer behind the permeable geotextile 31. Its surface is also equipped with permeable geotextile 33 and permeable holes 34. The gap between it and the soil layer is filled with a coarse sand filter layer 39 to further discharge groundwater or rainwater seepage from further outside the foundation pit, reduce the moisture content of the foundation soil, and maintain the strength and stability of the red bed soft rock. The retaining piles 21, together with the capping beam 22 and the waist beam 23, form a "pile-beam" collaborative support system. Compared with a single retaining pile, the overall lateral stiffness is increased by 35%-50%, which can effectively resist the lateral pressure of the red bed soft rock. The anchor cable 24 is set at a 20° angle with the retaining pile 21, so that the anchoring force is reasonably distributed in the horizontal and vertical directions. This not only restricts the lateral displacement of the retaining pile 21, but also offsets part of the vertical load and reduces the bending moment of the pile body. The cement grouting 25 fills the gap between the anchor cable 24 and the soil layer, which not only enhances the anchoring force, but also blocks the water flow from seeping in along the anchor hole, preventing the soil behind from softening. The permeable geotextile 31 provides complete coverage of the slope between the 21 retaining piles, solving the blind spot problem of traditional local drainage and effectively trapping loose soil and rock particles. The steel mesh 35 and the shotcrete layer 36 form a protective shell to prevent damage to the geotextile during construction and enhance the slope surface's erosion resistance. Multiple drainage anchor pipes 38 are installed along a vertical line, forming a three-dimensional drainage network with the drainage blind pipes 32. The drainage range covers the entire slope, and the drainage efficiency is 50%-70% higher than that of traditional single blind pipes. The dual filter design of the permeable geotextile 33 and the coarse sand filter layer 39 effectively prevents mud particles from clogging the pipes, extending the service life of the drainage system to more than 1.5 times the construction cycle of the foundation pit. Through the drainage mechanism 3, the soil loss of the red bed soft rock slope is reduced by more than 90%, and the soil softening coefficient is reduced to below 0.2, significantly improving the long-term stability of the support structure.

[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A structure suitable for foundation pit support in red bed soft rock, comprising a concrete foundation (1), characterized in that: The concrete foundation (1) is located at the bottom of the foundation pit. Support structures (2) are provided around the concrete foundation (1). The support structures (2) include support piles (21). A drainage structure (3) is provided on one side of the support structure (2). The drainage mechanism (3) includes an integral permeable geotextile (31), a drainage blind pipe (32) and a drainage anchor pipe (38). The drainage mechanism (3) is used to prevent the two sections of support piles (21) and the soft red rock behind them from being lost and softened by water.

2. The structure for supporting foundation pits in red bed soft rock according to claim 1, characterized in that: The permeable geotextile (31) is laid on the red soft rock soil between the two sections of the support piles (21); The permeable geotextile (31) is fixedly laid with a steel mesh (35) on the side near the foundation pit. A shotcrete layer (36) is fixedly installed on the surface of the steel mesh (35). The drainage blind pipe (32) is vertically installed between the permeable geotextile (31) and the steel mesh (35). The bottom end of the drainage blind pipe (32) is vertically connected to a blind pipe drain outlet (37). The blind pipe drain outlet (37) penetrates the shotcrete layer (36) and extends outward.

3. A structure suitable for foundation pit support in red bed soft rock according to claim 2, characterized in that: The drainage anchor pipe (38) penetrates the shotcrete layer (36), the integral permeable geotextile (31) and extends into the soil layer behind the integral permeable geotextile (31). The outlet of the drainage anchor pipe (38) is fixedly installed with an anchor pipe water collection pipe (310).

4. A structure suitable for foundation pit support in red bed soft rock according to claim 3, characterized in that: The surfaces of the drainage blind pipe (32) and drainage anchor pipe (38) are all fixedly provided with permeable geotextile (33), and the surfaces of the drainage blind pipe (32) and drainage anchor pipe (38) are all provided with permeable holes (34). The gap between the drainage anchor pipe (38) and the soil layer is filled with a coarse sand filter layer (39).

5. A structure suitable for foundation pit support in red bed soft rock according to claim 4, characterized in that: The support piles (21) are vertically set and penetrate deep into the soil layer. There are multiple support piles (21). The top of the side of the support pile (21) facing the pit is fixedly connected to a capping beam (22). The capping beam (22) connects the top of all the support piles (21).

6. A structure suitable for foundation pit support in red bed soft rock according to claim 5, characterized in that: A waist beam (23) is fixedly connected to the middle of the side of the support pile (21) facing the pit, and the waist beam (23) is also connected to all the support piles (21).

7. A structure suitable for foundation pit support in red bed soft rock according to claim 6, characterized in that: The support mechanism (2) also includes an anchor cable (24), which is inserted into the soil layer behind the support pile (21) and set at a 20° angle with the support pile (21). The end of the anchor cable (24) away from the soil layer passes through the support pile (21) and is fixedly connected to the waist beam (23). Cement grout (25) is poured into the gap between the anchor cable (24) and the soil layer. The concrete foundation (1) is surrounded by foundation drainage ditches (11).

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