A pit in-situ skirt reinforcement structure using channel steel
Patent Information
- Application Number
- CN202522071571.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2035-09-26
AI Technical Summary
[0003]传统加固方案在实际工程应用中，施工依赖重型专用机械（如搅拌桩机、高压注浆机），设备体型大、进场及作业空间要求高，在城市核心区原拆原建项目中，常因场地狭窄、周边建筑物密集导致机械无法灵活部署；并且，针对地下障碍物（如既有管线、废弃基础、孤石等）较多的场地，传统工艺易受障碍物阻挡，需频繁调整施工路线或清除障碍物，不仅增加施工成本，还可能破坏周边既有设施，延长工期，因此，有必要提出一种利用槽钢的坑内裙边加固结构来解决现有技术的不足
1、采用单排槽钢作为核心加固构件，将其按设定参数插入坑内裙边对应土体中，槽钢凭借自身钢材的高强度特性，直接对周边土体形成侧向约束：一方面限制土体在受力过程中的侧向滑动位移，避免因土体滑动导致的地基失稳，另一方面通过槽钢与土体的接触摩擦力以及槽钢自身的抗剪强度，将坑内裙边区域的侧向应力传递至深层稳定土体，从而显著提高地基承载力，抵抗基坑开挖或使用过程中产生的侧向荷载。
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Figure CN224705147U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of foundation pit construction, and in particular to a pit skirt reinforcement structure using channel steel. Background Technology
[0002] In foundation pit construction, the reinforcement of the inner skirt is a key link to ensure the stability of the foundation pit excavation, improve the bearing capacity of the foundation, and control soil deformation. Its reinforcement effect directly affects the safety of the project and the quality of subsequent structural construction. At present, the commonly used inner skirt reinforcement schemes in the industry mainly rely on traditional processes such as biaxial cement-soil mixing piles, compaction grouting, and high-pressure jet grouting piles. The core principle of this technology is to inject cement slurry or other curing agents into the original foundation soil, so that the soil reacts chemically with the curing agent to form a hardened reinforcement layer, thereby achieving the purpose of improving the bearing capacity of the foundation and reducing the lateral deformation of the soil.
[0003] In practical engineering applications, traditional reinforcement solutions rely on heavy specialized machinery (such as mixing pile machines and high-pressure grouting machines). The equipment is large and requires a large amount of space for access and operation. In urban core areas, demolition and reconstruction projects often face challenges due to narrow sites and dense surrounding buildings, making it difficult to deploy machinery flexibly. Furthermore, in sites with many underground obstacles (such as existing pipelines, abandoned foundations, boulders, etc.), traditional methods are easily obstructed by these obstacles, requiring frequent adjustments to the construction route or removal of obstacles. This not only increases construction costs but may also damage existing facilities and extend the construction period. Therefore, it is necessary to propose a pit skirt reinforcement structure using channel steel to address the shortcomings of existing technologies. Utility Model Content
[0004] To solve the above-mentioned technical problems, this utility model provides a pit skirt reinforcement structure using channel steel.
[0005] This utility model provides a pit skirt reinforcement structure using channel steel, comprising channel steel, a first force transmission belt, a second force transmission belt, a first cushion layer, a second cushion layer, a first bottom plate, a second bottom plate, pit retaining wall, a thick concrete slab, a first outer wall, a second outer wall, and a retaining wall capping. The channel steel is vertically inserted into the soil surrounding the pit. The first cushion layer is set on one side of the channel steel, and the second cushion layer is set on the other side of the channel steel. The pit retaining wall is set along the edge of the pit, and the retaining wall capping is set on top of the pit retaining wall. The first bottom plate is set on top of the first cushion layer. The first force transmission belt is set on top of the first cushion layer and located between the pit retaining wall and the first bottom plate. The second bottom plate is set on top of the second cushion layer. The second force transmission belt is set on top of the second cushion layer and located between the channel steel and the second bottom plate. The thick concrete slab is set on top of the second force transmission belt.
[0006] Preferably, the channel steel has a cross-sectional height of 220mm and a length of 2500mm. It is inserted vertically into the soil around the foundation pit in a single row with a center-to-center spacing of 350mm between adjacent channel steels. The ratio of the depth of the channel steel inserted into the soil to the height exposed in the soil is 1.5:1, which is used to limit the lateral sliding of the soil.
[0007] Preferably, the first outer wall is disposed on top of the first base plate and integrally formed therewith, and the second outer wall is disposed on top of the second base plate and integrally formed therewith.
[0008] Preferably, the thickness of both the first pad and the second pad is not less than 100 mm.
[0009] Preferably, the thickness of the concrete thick plate is not less than 200mm.
[0010] Compared with related technologies, the pit skirt reinforcement structure using channel steel provided by this utility model has the following beneficial effects: 1. A single row of channel steel is used as the core reinforcement component. It is inserted into the corresponding soil of the skirt inside the pit according to the set parameters. The channel steel directly forms lateral constraints on the surrounding soil due to its high strength characteristics: on the one hand, it restricts the lateral sliding displacement of the soil during the stress process, avoiding foundation instability caused by soil sliding; on the other hand, through the contact friction between the channel steel and the soil and the shear strength of the channel steel itself, the lateral stress in the skirt area inside the pit is transferred to the deep stable soil, thereby significantly improving the bearing capacity of the foundation and resisting the lateral load generated during the excavation or use of the foundation pit.
[0011] 2. By utilizing the integrity of the thick concrete slab, the dispersed channel steels are connected into a stable reinforcement system, avoiding the failure of individual channel steels due to uneven stress. On the other hand, for areas where underground obstacles need to be avoided during construction, the local thickening or reinforcement of the thick concrete slab can fill the weak points in reinforcement caused by the absence of channel steel in that area, ensuring the balanced stress of the entire skirt reinforcement area and improving the reinforcement effect. Attached Figure Description
[0012] Figure 1 A schematic diagram of the overall structure of the pit skirt reinforcement structure using channel steel provided by this utility model.
[0013] The following are the labels in the diagram: 1. Channel steel; 21. First force transmission belt; 22. Second force transmission belt; 31. First cushion layer; 32. Second cushion layer; 41. First base plate; 42. Second base plate; 5. Excavation pit retaining wall; 6. Thick concrete continuous slab; 71. First outer wall; 72. Second outer wall; 8. Retaining capping. Detailed Implementation
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Example Please refer to the following: Figure 1 A pit-reinforced structure utilizing channel steel with an inner skirt includes a channel steel 1, a first force transmission belt 21, a second force transmission belt 22, a first cushion layer 31, a second cushion layer 32, a first bottom plate 41, a second bottom plate 42, a pit retaining wall 5, a thick concrete slab 6, a first outer wall 71, a second outer wall 72, and a retaining cap 8. The channel steel 1 is vertically inserted into the soil surrounding the pit. The first cushion layer 31 is located on one side of the channel steel 1, and the second cushion layer 32 is located on the other side of the channel steel 1. The pit retaining wall 5 is installed along the edge of the pit, and the retaining cap 8 is located on top of the pit retaining wall 5. The base plate 41 is set on top of the first cushion layer 31, the first force transmission band 21 is set on top of the first cushion layer 31 and located between the foundation pit retaining wall 5 and the first base plate 41, the second base plate 42 is set on top of the second cushion layer 32, the second force transmission band 22 is set on top of the second cushion layer 32 and located between the channel steel 1 and the second base plate 42, and the concrete thick connecting plate 6 is set on top of the second force transmission band 22, and the concrete thick connecting plate 6 is adapted to fit and adhere to the contact surfaces of the channel steel 1, the second force transmission band 22, the first cushion layer 31, the first base plate 41, the second base plate 42 and the second outer wall 72.
[0016] In the above, the channel steel 1 is vertically inserted into the soil as the core to resist lateral displacement, the pit retaining wall 5 ensures the overall stability of the pit edge, the first force transmission belt 21 and the second force transmission belt 22 achieve smooth load transfer between the pit retaining wall 5, the first bottom plate 41, the channel steel 1 and the second bottom plate 42 respectively. The first force transmission belt 21 and the second force transmission belt 22 are both concrete force transmission belts, and the thick concrete connecting plate 6 covers the top of the second force transmission belt 22 to further strengthen the connection between the channel steel 1 and the superstructure and improve the overall deformation resistance.
[0017] Furthermore, the channel steel 1 has a cross-sectional height of 220mm. The channel steel 1 can be a hot-rolled channel steel of model 22a#. The length of a single channel steel 1 is 2500mm. It is inserted vertically into the soil around the foundation pit in a single row with a center-to-center spacing of 350mm between adjacent channel steels 1. The ratio of the depth of the channel steel 1 inserted into the soil to the height exposed in the soil is 1.5:1, which is used to limit the lateral sliding of the soil.
[0018] In the above, the channel steel 1 is made of 22a# hot-rolled channel steel, which has excellent bending and shear strength and can effectively resist the lateral thrust of the soil. The single-row arrangement with an adjacent center spacing of 350mm ensures reinforcement density while avoiding material waste, achieving a balance between economy and safety. The insertion depth to exposure height ratio of 1.5:1 ensures that the lower part of the channel steel 1 penetrates into the deep stable soil, and the upper part can be effectively connected to the second force transmission belt 22 and the thick concrete connecting plate 6.
[0019] Furthermore, the first outer wall 71 is disposed on top of the first base plate 41 and integrally formed therewith, and the second outer wall 72 is disposed on top of the second base plate 42 and integrally formed therewith.
[0020] In the above, the first outer wall 71 and the first base plate 41, and the second outer wall 72 and the second base plate 42 are integrally formed, which can distribute the load of the upper structure more evenly to the first cushion layer 31, the second cushion layer 32 and the soil.
[0021] Furthermore, the thickness of both the first pad 31 and the second pad 32 is not less than 100 mm.
[0022] Furthermore, the thickness of the concrete thick slab 6 is not less than 200mm.
[0023] The working principle of the pit skirt reinforcement structure using channel steel provided by this utility model is as follows: During the construction of this structure, all obstacles and debris above and below ground must be removed, the ground leveled and compacted, and then... Figure 1 The structural method involves vertically inserting multiple channel steels 1 in a single row with an adjacent center-to-center spacing of 350mm into the soil surrounding the foundation pit. The ratio of insertion depth to the height exposed in the soil is 1.5:1. The high strength of the channel steel 1 restricts lateral sliding of the soil and transfers lateral stress to the deeper stable soil through its shear strength and contact friction with the soil, thereby improving the bearing capacity of the foundation. The first cushion layer 31 and the second cushion layer 32 not only level the soil to provide a flat construction base but also isolate the soil from the superstructure. The first force transmission belt 21 connects the foundation pit retaining wall 5 and the first bottom plate 4. The load is transferred between the channel steel 1 and the second base plate 42 through the second force transmission belt 22, so as to achieve a smooth transition of force flow. By covering the channel steel 1 and the second force transmission belt 22 with the thick concrete connecting plate 6, the dispersed channel steel 1 is connected into an integral reinforcement system. It can also locally thicken or reinforce the area where the channel steel 1 is missing due to underground obstacles to fill the weak points. The first base plate 41 and the second base plate 42 are integrally formed with the first outer wall 71 and the second outer wall 72 to form a rigid structure, which bears the load transferred by the force transmission belt and transfers it to the cushion layer and soil.
[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A pit-side skirt reinforcement structure utilizing channel steel, characterized in that, The structure includes a channel steel (1), a first force transmission belt (21), a second force transmission belt (22), a first cushion layer (31), a second cushion layer (32), a first base plate (41), a second base plate (42), a pit retaining wall (5), a thick concrete slab (6), a first outer wall (71), a second outer wall (72), and a retaining cap (8). The channel steel (1) is vertically inserted into the soil surrounding the pit. The first cushion layer (31) is located on one side of the channel steel (1), and the second cushion layer (32) is located on the other side of the channel steel (1). The pit retaining wall (5) is set along the edge of the pit. The retaining capping (8) is set on top of the foundation pit retaining (5), the first bottom plate (41) is set on top of the first cushion layer (31), the first force transmission belt (21) is set on top of the first cushion layer (31) and located between the foundation pit retaining (5) and the first bottom plate (41), the second bottom plate (42) is set on top of the second cushion layer (32), the second force transmission belt (22) is set on top of the second cushion layer (32) and located between the channel steel (1) and the second bottom plate (42), and the concrete thick connecting plate (6) is set on top of the second force transmission belt (22).
2. The pit-side skirt reinforcement structure using channel steel according to claim 1, characterized in that, The channel steel (1) has a cross-sectional height of 220mm and a length of 2500mm. It is inserted vertically into the soil around the foundation pit in a single row with a center-to-center spacing of 350mm between adjacent channel steels (1). The ratio of the depth of the channel steel (1) inserted into the soil to the height exposed in the soil is 1.5:1, which is used to limit the lateral sliding of the soil.
3. The pit-side skirt reinforcement structure using channel steel according to claim 1, characterized in that, The first outer wall (71) is located on top of the first base plate (41) and integrally formed therewith, and the second outer wall (72) is located on top of the second base plate (42) and integrally formed therewith.
4. The pit-side skirt reinforcement structure using channel steel according to claim 1, characterized in that, The thickness of the first pad (31) and the second pad (32) is not less than 100 mm.
5. The pit-side skirt reinforcement structure using channel steel according to claim 1, characterized in that, The thickness of the concrete thick plate (6) is not less than 200mm.