Composite structure for reinforcing foundation in soft soil area
By setting up grilled reinforced piles and support piles in the soft soil layer, combining gravel cushion layer and uniaxial cement mixing piles, the problem of insufficient bearing capacity and stability of the soft soil foundation is solved, and the high strength of the foundation is achieved Improve stability to ensure the safety of building structures and construction conditions.
Patent Information
- Application Number
- CN202420534667.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-19
AI Technical Summary
The bearing capacity of soft soil foundations is low and easy to deform. The existing reinforcement methods cannot effectively improve the stability and bearing capacity of the foundation, resulting in unstable building structure.
Grid-shaped reinforced piles and support piles are installed in the soft soil layer. The bottom of the pile passes through the interface of the soft soil layer at least 1m. A gravel cushion layer is laid in the pile head area, and a single-axis cement mixing pile is used to form a composite foundation to improve the structure Stability and bearing capacity.
By forming a high-strength and stable composite foundation, the soil mechanical strength of the foundation pit support piles is improved to ensure the safety of the building structure and construction conditions.
Smart Images
Figure CN222206280U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of geotechnical engineering, in particular to a soft soil area foundation reinforcement composite structure. Background Art
[0002] Common soft soil in the foundation of construction projects has the characteristics of high water content, high porosity, low mechanical strength and easy deformation. The soft soil layer in the foundation is mainly composed of soft clay, silt or miscellaneous fill soil. The bearing capacity of soft soil foundation is low and drainage is difficult. After being disturbed by construction, it is very easy to cause uneven settlement and deformation of the foundation of the construction project, which is not conducive to the construction of the construction project and the stability of the structure. In severe cases, it will cause structural instability and tilt. Therefore, it is necessary to reinforce the soft soil foundation, improve the mechanical properties of the soft soil layer and the bearing capacity of the foundation, and ensure the safety and stability of the construction project structure when carrying out construction projects on soft soil foundations. For foundation pit projects in this type of site environment, the foundation soil is reinforced in advance in the foundation pit to form a composite foundation. On the one hand, it can provide a reliable bearing layer for later engineering buildings (structures) to reduce post-construction settlement. On the other hand, it can improve the mechanical strength of the soil in the passive zone of the foundation pit support piles, which is conducive to the support piles to better play a supporting role and provide a good working surface for construction operations in the foundation pit. Currently, soft soil foundations are mainly reinforced by preloading, replacement filling, cement mixing piles, etc., but these structures are structurally unstable and cannot effectively solve the problems of foundation bearing capacity and stability.
[0003] Therefore, a new type of soft soil foundation reinforcement structure is needed, which can improve the bearing capacity and stability of the foundation by improving the stability of the reinforcement structure. Utility Model Content
[0004] In view of this, the purpose of the utility model is to provide a composite structure for strengthening the foundation in a soft soil area, which can improve the bearing capacity and stability of the foundation by improving the stability of the reinforced structure.
[0005] The soft soil area foundation reinforcement composite structure of the utility model comprises reinforcement piles arranged in the soft soil layer, the reinforcement piles are arranged in an array in the direction of the foundation pit and perpendicular to the direction of the foundation pit to interlock with each other to form a grid-like reinforcement area along the soft soil area as a whole, and support piles are arranged outside the reinforcement area;
[0006] Furthermore, the reinforcement piles are distributed along the grid axis in a single row, a single row and multiple rows, multiple rows and single rows, or multiple rows and multiple rows;
[0007] Furthermore, the bottom of the reinforcement pile is set at a position not less than 1m below the interface of the soft soil layer;
[0008] Furthermore, a cushion layer is provided in the pile head area of the reinforcement pile;
[0009] Furthermore, the cushion layer is a crushed stone cushion layer laid after the pile head is broken;
[0010] Furthermore, the laying thickness of the crushed stone cushion layer is the height of the pile head, and the surface of the crushed stone cushion layer is statically compacted by a smooth roller, and the compaction degree is not less than 0.9;
[0011] Furthermore, the reinforcement piles on both sides of the foundation pit are arranged close to the inner side of the supporting piles at a distance of no more than 0.5m;
[0012] Furthermore, the reinforcement piles are uniaxial cement mixing piles.
[0013] The beneficial effects of the utility model: the soft soil foundation reinforcement structure of the utility model, by setting a specific reinforcement structure in the foundation pit, the foundation reinforcement piles and the foundation pit supporting piles are connected to form a whole, and finally a composite foundation is formed. The reinforcement structure has high strength and strong stability, can improve the bearing capacity and stability of the foundation, and play a role in improving the mechanical strength of the soil in the passive zone of the foundation pit supporting piles, which is conducive to the supporting piles to better play a supporting role, and also provides a good working surface for construction operations in the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments:
[0015] Figure 1 It is a plan layout diagram of a composite foundation treatment structure in a general foundation pit in the utility model (arranged in a single row and a single column);
[0016] Figure 2 It is a plan layout diagram of a composite foundation treatment structure in a general foundation pit in the utility model (single-row and multi-column layout);
[0017] Figure 3 It is a plan layout diagram of a composite foundation treatment structure in a general foundation pit in the utility model (multiple rows and single columns);
[0018] Figure 4 It is a plan layout diagram of a composite foundation treatment structure in a general foundation pit in the utility model (arranged in multiple rows and columns);
[0019] The accompanying drawings are marked as follows: 1—foundation pit positioning line; 2—support pile; 3—solid part of reinforcement pile; 4—solid part of reinforcement pile;
[0020] —cushion layer; 5—drilled part of reinforced pile; 6—ground line; 7—bottom of soft soil layer. DETAILED DESCRIPTION
[0021] The soft soil area foundation reinforcement composite structure of this embodiment includes reinforcement piles 3 arranged in the soft soil layer, and the reinforcement piles 3 are arranged in an array in the direction of the foundation pit and perpendicular to the direction of the foundation pit to form a grid-like reinforcement area along the soft soil area as a whole, and support piles 2 are arranged outside the reinforcement area; the reinforcement piles 3 are solid pile parts, and the reinforcement piles 3 are hollow drilled above the bottom of the foundation pit during construction, that is, the hollow pile part 5, and the bottom of the foundation pit is the actual pile range, that is, the solid pile part. The "reinforcement piles 3" of this embodiment and the following embodiments refer to the solid pile part after construction. "The direction of the foundation pit and the direction of the foundation pit perpendicular to the direction of the foundation pit" refers to the length and width of the foundation pit. "In an array" means that the reinforcement piles 3 are distributed in rows and columns to form a grid; "the reinforcement piles 3 are mutually interlocked" means that the reinforcement piles 3 in the same row are mutually interlocked to form interlocking piles, the reinforcement piles 3 in the same column are mutually interlocked to form interlocking piles, and the reinforcement piles 3 in the intersection area of rows and columns are mutually interlocked to form interlocking piles. The structure is reinforced and combined with the support piles 2 outside the reinforcement piles 3 to form a whole, which has strong integrity, high structural strength, good stability, and high structural bearing capacity. The composite foundation formed has higher bearing capacity and stability.
[0022] In this embodiment, the reinforcement piles 3 are arranged along the grid axis in a single row, a single row and multiple rows, multiple rows and single rows, or multiple rows and multiple rows; the so-called single row and single row means that the reinforcement piles 3 in both rows and columns are single and arranged in rows, such as Figure 1 As shown; Single column and multiple rows means that there is one column on the column and multiple rows on the row, such as Figure 3 As shown, multiple columns and single rows are as follows Figure 2 As shown, multiple columns and rows are Figure 4 As shown. From a structural point of view, the multi-row or multi-column arrangement is stronger than the single-row structure, especially the multi-row and multi-row arrangement, but the construction is not as simple as the single-row. Therefore, the appropriate arrangement of the reinforcement piles 3 can be selected according to the properties of the soft soil layer.
[0023] In this embodiment, the bottom of the reinforcement pile 3 is set at no less than 1m below the soft soil interface 7; ensuring that the reinforcement pile 3 has sufficient depth to improve the stability of the structure, it is also convenient for the overall reinforcement of the soft soil area and the area surrounding the soft soil, and improves the structural integrity and stability of the reinforced area. In order to improve the structural stability and the connection with the soft soil surrounding area, branches can be set on the surface of the reinforcement pile, and the branches are arranged at intervals along the circumference of the reinforcement pile to form a barb structure, or branches with a barb structure are set on the reinforcement pile below the soft soil interface 7.
[0024] In this embodiment, a cushion layer 4 is provided in the pile head area of the reinforcement pile 3; the cushion layer 4 is a crushed stone cushion layer laid after the pile head is broken; the laying thickness of the crushed stone cushion layer is the height of the broken pile head, and the surface of the crushed stone cushion layer is statically compacted by a smooth roller, and the compaction degree is not less than 0.9; the cushion layer 4 is used to adjust the sharing of the horizontal load of the pile and the soil, to ensure that the pile and the soil bear the load together, and at the same time, the unevenness of the foundation is eliminated by adjusting the thickness of the cushion layer 4, so that the foundation can achieve coordinated deformation. Therefore, in this embodiment, the cushion layer 4 should be implemented after the pile head of the reinforcement pile 3 at the bottom of the pit is broken by 300mm, and the cushion layer 4 adopts a 300mm thick graded crushed stone cushion layer, and the surface is statically compacted by a smooth roller, and the compaction degree is not less than 0.9, and the cushion layer 4 should be paved in the foundation pit including all the reinforcement piles 3. Of course, in order to improve the effect, a composite cushion layer can also be used, including a crushed stone lower cushion layer, a steel-plastic geogrid and a crushed stone upper cushion layer.
[0025] In this embodiment, the reinforcement piles 3 on both sides of the foundation pit are arranged close to the inner side of the supporting piles 2 at a distance of no more than 0.5m, ensuring the integrity of the supporting piles 2 and the reinforcement piles 3 so that the reinforcement piles 3 and the supporting piles 2 cooperate with each other.
[0026] In this embodiment, the reinforcement piles 3 are uniaxial cement mixing piles, and the grid spacing formed by the reinforcement piles 3 is 1.5m (along the direction of the foundation pit) × 2.0m (perpendicular to the direction of the foundation pit), and uniaxial cement mixing piles (pile diameter 700mm@500mm) are used for arrangement.
[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A composite structure for strengthening foundation in soft soil area, characterized by: It includes reinforcement piles arranged in the soft soil layer. The reinforcement piles are arranged in an array in the direction of the foundation pit and perpendicular to the direction of the foundation pit to form a grid-like reinforcement area along the soft soil area as a whole, and support piles are arranged outside the reinforcement area.
2. The soft soil area foundation reinforcement composite structure according to claim 1, characterized in that: The reinforcement piles are distributed along the grid axis in a single row, a single row and multiple rows, multiple rows and single rows, or multiple rows and multiple rows.
3. The soft soil area foundation reinforcement composite structure according to claim 2 is characterized in that: The bottom of the reinforcement pile is set at a level not less than 1m below the soft soil layer interface.
4. The soft soil area foundation reinforcement composite structure according to claim 1, characterized in that: A cushion layer is arranged in the pile head area of the reinforcement pile.
5. The composite structure for strengthening the foundation in soft soil area according to claim 4, characterized in that: The cushion layer is a crushed stone cushion layer laid after the pile head is broken.
6. The soft soil area foundation reinforcement composite structure according to claim 5, characterized in that: The laying thickness of the crushed stone cushion layer is the height of the broken pile head, and the surface of the crushed stone cushion layer is statically compacted by a smooth roller, and the compaction degree is not less than 0.
9.
7. The soft soil area foundation reinforcement composite structure according to claim 1, characterized in that: The reinforcement piles on both sides of the foundation pit are set close to the inner side of the supporting piles at a distance of no more than 0.5m.
8. The composite structure for strengthening the foundation in soft soil areas according to claim 7, characterized in that: The reinforcement pile is a uniaxial cement mixing pile.