Soft soil foundation shallow solidification and pile foundation composite reinforcing structure
By constructing a shallow solidification structure and a pile foundation composite reinforcement system on soft soil foundations, and utilizing components such as industrial solid waste-based solidifying agents and drainage blind ditches, the problems of long construction cycles, high costs, and poor drainage effects in traditional methods have been solved, achieving efficient foundation reinforcement and improved drainage performance.
Patent Information
- Application Number
- CN202520421562.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Traditional soft soil foundation treatment methods have problems such as long construction period, high cost, slow drainage effect or adverse environmental impact, especially in coastal areas, rivers, lakes and low-lying areas.
The structure employs a shallow solidification structure and a pile foundation composite reinforcement structure, including a sand and gravel drainage cushion layer, a steel slag cushion layer, a shallow solidification layer, precast pipe piles, and horizontal and vertical reinforcing grids to form a drainage network and reinforcement system. Industrial solid waste-based solidifying agents are used to improve soft soil, and combined with drainage blind ditches and sump wells, the bearing capacity and stability of the foundation are enhanced.
It improves the bearing capacity and stability of soft soil foundations, enhances the overall strength and deformation resistance of the foundation, has excellent drainage performance, reduces the impact of water on foundation stability, and lowers construction costs and time.
Smart Images
Figure CN223838041U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foundation treatment and pile foundation technology, and in particular to a composite reinforcement structure for shallow solidification of soft soil foundation and pile foundation. Background Technology
[0002] Soft soil foundations are defined as weak soil layers with low strength and high compressibility, often containing some organic matter. Soft soil foundations are a common type of unsuitable foundation in engineering construction. Due to their characteristics of high compressibility, low bearing capacity, and poor permeability, they pose significant challenges to the safety and stability of engineering projects. The problems with soft soil foundations are particularly prominent in coastal areas, near rivers and lakes, and in low-lying inland areas.
[0003] Traditional methods for treating soft soil foundations mainly include replacement, drainage consolidation, and dynamic compaction. Replacement involves excavating a certain depth of soft soil below the foundation and then filling it in layers with hard, high-strength, stable, and erosion-resistant materials (such as sand, gravel, pebbles, plain soil, lime-soil, cinder, and slag). Simultaneously, manual or mechanical methods are used to compact and vibrate each layer to achieve the required density, creating a good artificial foundation. Drainage consolidation involves pre-installing vertical drainage systems (such as plastic drainage strips or bagged sand wells) in the foundation. Under the weight of the building or external preload, the drainage system drains pore water from the foundation, causing consolidation settlement and improving the bearing capacity and stability. Dynamic compaction utilizes the powerful impact of a heavy hammer falling freely from a height to compact the foundation, increasing the soil density and reducing the void ratio, thereby improving the bearing capacity and stability.
[0004] However, these methods have certain limitations in practical applications. The replacement method requires a large amount of earthwork, which not only has a long construction period but also high costs. Although the drainage consolidation method can effectively reduce the water content of the foundation, the drainage process is slow and it is not effective for deep soft soil layers. The dynamic compaction method may have adverse effects on the surrounding environment due to excessive impact force.
[0005] In summary, this technology aims to provide a composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation to solve the above problems. Utility Model Content
[0006] This utility model provides a composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation, which solves the above-mentioned technical problems.
[0007] To solve the above-mentioned technical problems, the present invention provides a composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation, including a shallow solidification structure and a pile reinforcement structure. The shallow solidification structure includes a sand and gravel drainage cushion layer, a steel slag cushion layer, and a shallow solidification layer. The pile reinforcement structure includes multiple precast pipe piles and horizontal and vertical reinforcing grids. The shallow solidification layer is laid on the surface of the soft soil foundation to be treated. The multiple precast pipe piles are embedded in the shallow solidification layer in a quincunx pattern. The tops of the multiple precast pipe piles are connected by horizontal and vertical reinforcing grids. Drainage blind ditches are set every 20 to 35 meters around and within the area of the shallow solidification layer. The drainage blind ditches around the soft soil foundation to be treated and the drainage blind ditches within the area are interconnected to form a drainage network. Multiple water collection wells are set in the drainage blind ditches. The steel slag cushion layer is located above the shallow solidification layer, and the sand and gravel drainage cushion layer is located above the steel slag cushion layer. The bottom of the water collection well extends below the bottom of the drainage blind ditch, and the wellhead extends above the sand and gravel drainage cushion layer.
[0008] Preferably, the shallow solidified layer is formed by improving soft soil with an industrial solid waste-based solidifying agent, with a thickness of 1.5-2.5m, and the solidifying agent includes 40-60% carbonated steel slag, 4-6% slag powder and 34-54% cement by mass percentage.
[0009] Preferably, the cross- and longitudinally reinforced grid is made of biaxially oriented fiberglass material with a mesh size of 50mm × 50mm and a tensile strength ≥ 80kN / m. 2 .
[0010] Preferably, the thickness of the sand and gravel drainage cushion layer is 50-60cm, and the particle size of the crushed stone is no greater than 40mm; the thickness of the steel slag cushion layer 6 is 60-70cm, and the particle size is no greater than 50mm.
[0011] Preferably, the precast pipe piles are cement-based composite material piles with a diameter of 50-70cm and a spacing of 3-5 times the diameter.
[0012] Preferably, the water collection well is equipped with a reinforced concrete well pipe inside the well hole. The bottom and sides of the reinforced concrete well pipe are fixed by backfilling with crushed stone filter material. The upper end of the reinforced concrete well pipe extends out of the well hole and is sealed with a well cover. A water pump is also installed at the bottom of the reinforced concrete well pipe. The output end of the water pump is connected to a water pipe that extends out of the top of the reinforced concrete well pipe.
[0013] Compared with related technologies, the composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation provided by this utility model has the following beneficial effects:
[0014] This utility model provides a structure that effectively improves the bearing capacity and stability of soft soil foundations. The shallow solidification layer enhances the overall strength of the foundation. The composite reinforcement structure of precast pipe piles and horizontal and vertical reinforcing grids further improves the foundation's resistance to deformation. The installation of drainage blind ditches and sump pits effectively removes water accumulation in the foundation, reducing the impact of water on the foundation's stability. The laying of steel slag cushion layer and sand and gravel drainage cushion layer not only ensures the integrity and smoothness of the entire drainage system but also further improves the drainage performance and bearing capacity of the foundation. Attached Figure Description
[0015] Figure 1 This is a longitudinal cross-sectional schematic diagram of the composite reinforcement structure of shallow solidification and pile foundation for soft soil foundation of this utility model;
[0016] Figure 2 This is a schematic diagram of the composite reinforcement structure of shallow solidification and pile foundation for soft soil foundation according to this utility model;
[0017] The following are labeled in the diagram: 1. Precast pipe pile; 2. Horizontal and vertical reinforced grid; 3. Drainage blind ditch; 4. Sump well; 5. Sand and gravel drainage cushion layer; 6. Steel slag cushion layer; 7. Shallow solidification layer. Detailed Implementation
[0018] Implementation examples, by Figure 1-2 The present invention describes a composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation, comprising a shallow solidification structure and a pile reinforcement structure. The shallow solidification structure includes a sand and gravel drainage cushion layer 5, a steel slag cushion layer 6, and a shallow solidification layer 7. The pile reinforcement structure includes multiple precast pipe piles 1 and transverse and longitudinal reinforcing grids 2. The shallow solidification layer 7 is laid on the surface of the soft soil foundation to be treated. The shallow solidification layer 7 is formed by improving the soft soil with an industrial solid waste-based solidification agent, with a thickness of 1.5-2.5m, and the solidification agent contains a certain percentage by mass. The precast pipe piles consist of 40-60% carbonated steel slag, 4-6% slag powder, and 34-54% cement. Multiple precast pipe piles 1 are embedded in a shallow curing layer 7 in a quincunx pattern. The tops of the precast pipe piles 1 are connected by a horizontally and vertically reinforced grid 2, which is made of biaxially oriented fiberglass. The precast pipe piles 1 are cement-based composite piles with a diameter of 50-70cm, a spacing 3-5 times the diameter, a grid size of 50mm×50mm, and a tensile strength ≥80kN / m². 2Drainage blind ditches 3 are installed every 20 to 35 meters around and within the shallow solidification layer 7. The drainage blind ditches 3 around the soft soil foundation to be treated and the drainage blind ditches 3 within the area are interconnected to form a drainage network. Multiple water collection wells 4 are installed in the drainage blind ditches 3. The steel slag cushion layer 6 is located above the shallow solidification layer 7, and the sand and gravel drainage cushion layer 5 is located above the steel slag cushion layer 6. The thickness of the sand and gravel drainage cushion layer 5 is 50-60cm, and the particle size of the crushed stone is no greater than 40mm. The thickness of the steel slag cushion layer 6 is 60-70cm, and the particle size is no greater than 50mm. The bottom of the water collection well 4 extends below the bottom of the drainage blind ditch 3, and the well opening extends above the sand and gravel drainage cushion layer 5. A reinforced concrete well pipe is installed inside the water collection well 4. The bottom and sides of the reinforced concrete well pipe are backfilled and fixed with crushed stone filter material. The upper end of the reinforced concrete well pipe extends out of the well hole and is hinged with a well cover for sealing. A water pump is also installed at the bottom of the reinforced concrete well pipe, and the output end of the water pump is connected to a water pipe extending out of the top of the reinforced concrete well pipe.
[0019] Specifically, firstly, a shallow solidification layer 7, formed by modifying the soft soil with an industrial solid waste-based solidifying agent, is laid on the soft soil foundation to be treated. This layer is 2 meters thick, and the solidifying agent is a mixture of 50% carbonated steel slag, 5% slag powder, and 45% cement by weight percentage. Next, multiple precast cement-based composite pipe piles 1, each 60 cm in diameter, are embedded in a quincunx pattern on the shallow solidification layer 7, with a pile spacing of four times the diameter, i.e., 2.4 meters. The pile tops are connected by a horizontally and vertically reinforced grid 2 made of biaxially stretched fiberglass material. The grid mesh size is 50 mm × 50 mm, and the tensile strength reaches 80 kN / m. 2 .
[0020] Drainage blind ditches 3 are installed every 25 meters around and within the shallow solidification layer 7. These ditches are filled with gravel to form effective drainage channels. The drainage blind ditches 3 are interconnected around and within the soft soil foundation to be treated, forming a drainage network. Collection wells 4 are installed at regular intervals within the drainage blind ditches 3. The bottom of the collection well 4 extends below the bottom of the drainage blind ditches 3, and the well opening extends above the subsequently laid sand and gravel drainage cushion layer 5. The collection well 4 contains a reinforced concrete well pipe. The bottom and sides of the well pipe are backfilled and fixed with gravel filter material. The upper end of the well pipe extends out of the well opening and is hinged with a well cover for sealing. A water pump is also installed at the bottom of the well pipe to remove accumulated water. The pump output is connected to a water pipe extending out of the top of the well pipe.
[0021] Above the shallow solidification layer 7, a 65 cm thick steel slag cushion layer 6 and a 55 cm thick sand and gravel drainage cushion layer 5 are laid sequentially. The particle size of the steel slag cushion layer 6 is no greater than 50 mm, and the particle size of the crushed stone in the sand and gravel drainage cushion layer 5 is no greater than 40 mm.
[0022] The reinforcement structure in this embodiment effectively improves the bearing capacity and stability of the soft soil foundation. The shallow solidification layer 7 enhances the overall strength of the foundation. The composite reinforcement structure of precast pipe piles 1 and horizontal and vertical reinforcing grids 2 further improves the foundation's resistance to deformation. The quincunx arrangement of the precast pipe piles 1 creates multi-directional constraints, which can effectively resist lateral deformation of the soil and increase the friction of the pile-soil interface. At the same time, the cement-based material of the shallow solidification layer 7 can fill the gaps between piles and inhibit soil softening caused by groundwater seepage. Finally, the setting of drainage blind ditch 3 and sump well 4 effectively removes water accumulation in the foundation, reducing the impact of water on the stability of the foundation. Combined with the laying of steel slag cushion layer 6 and sand and gravel drainage cushion layer 5, it can ensure the integrity and smoothness of the entire drainage system and further improve the drainage performance and bearing capacity of the foundation.
[0023] Working principle:
[0024] Site preparation: Clear debris from the surface of the soft soil foundation to be treated, ensure the site is flat, and use surveying instruments to accurately measure and lay out the site to determine the location and dimensions of the shallow solidification layer 7, precast pipe pile 1, drainage blind ditch 3 and sump well 4.
[0025] Construction of shallow solidification layer 7: Mix the solidification agent material according to the design ratio (50% carbonated steel slag, 5% slag powder, 45% cement), mix the solidification agent with soft soil at a ratio of 1:5 (by mass), and lay it into shallow solidification layer 7 with a thickness of 2 meters, and compact it to the design density.
[0026] Construction of precast pipe piles 1: Select cement-based composite precast pipe piles 1 with a diameter of 60 cm and a length determined according to the foundation depth. Embed the precast pipe piles 1 in a quincunx pattern on the shallow curing layer 7, with a pile spacing of 4 times the diameter, i.e., 2.4 meters. Use specialized piling equipment to drive the precast pipe piles 1 into the designed depth, ensuring the pile body is vertical and accurately positioned. The pile tops are connected by a horizontally and vertically reinforced grid 2 made of biaxially stretched fiberglass material. The grid mesh size is 50 mm × 50 mm, and the tensile strength reaches 80 kN / m. 2 .
[0027] Construction of Drainage Ditch 3 and Collection Well 4: Drainage ditch 3 is installed every 25 meters around and within the shallow solidification layer 7. The ditch width is 30 cm, and the depth is determined according to the foundation conditions. The drainage ditch 3 is filled with crushed stone with a particle size not exceeding 20 mm to form an effective drainage channel. Collection well 4 is installed every 50 meters within the drainage ditch 3. The diameter of collection well 4 is 1 meter, and the depth is determined according to the depth of the drainage ditch. A reinforced concrete well pipe is installed inside the collection well 4, with a diameter of 30 cm and a wall thickness of not less than 5 cm. The bottom and sides of the well pipe are backfilled and fixed with crushed stone filter material (particle size not exceeding 10 mm). The upper end of the well pipe extends out of the well hole and is hinged with a well cover for sealing. A water pump is installed at the bottom of the well pipe. The power of the water pump is determined according to the depth and water volume of the collection well 4. The output end is connected to a water pipe extending out of the top of the well pipe.
[0028] Construction of steel slag cushion layer 6 and sand and gravel drainage cushion layer 5: A steel slag cushion layer 6 with a thickness of 65 cm is laid on top of the shallow solidification layer 7. The steel slag particle size is not greater than 50 mm. A sand and gravel drainage cushion layer 5 with a thickness of 55 cm is laid on top of the steel slag cushion layer 6. The crushed stone particle size is not greater than 40 mm.
[0029] Water pump installation and commissioning in sump 4: Install the water pump in sump 4 and connect the water pipe to the outside of the top of the well pipe. Commission the pump to ensure it is working properly.
[0030] Inspection and Acceptance: Conduct a comprehensive inspection of the completed reinforced structure to ensure that all parameters meet the design requirements, carry out load-bearing capacity tests and stability analyses, and verify the reinforcement effect.
Claims
1. A composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation, comprising a shallow solidification structure and a pile reinforcement structure, characterized in that, The shallow solidification structure includes a sand and gravel drainage cushion layer (5), a steel slag cushion layer (6), and a shallow solidification layer (7); the pile reinforcement structure includes multiple precast pipe piles (1) and horizontal and vertical reinforcing grids (2). The shallow solidification layer (7) is laid on the surface of the soft soil foundation to be treated. The multiple precast pipe piles (1) are embedded in the shallow solidification layer (7) in a quincunx pattern. The tops of the multiple precast pipe piles (1) are connected by horizontal and vertical reinforcing grids (2). The shallow solidification layer (7) is reinforced every twenty square meters around its perimeter and within its area. Drainage blind ditches (3) are set up from 35 meters to 35 meters. The drainage blind ditches (3) around the soft soil foundation to be treated and the drainage blind ditches (3) in the area are interconnected to form a drainage network. Multiple water collection wells (4) are set up in the drainage blind ditches (3). The steel slag cushion layer (6) is located above the shallow solidification layer (7). The sand and gravel drainage cushion layer (5) is located above the steel slag cushion layer (6). The bottom of the water collection well (4) extends below the bottom of the drainage blind ditches (3) and the wellhead extends above the sand and gravel drainage cushion layer (5).
2. The composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation according to claim 1, characterized in that, The shallow solidified layer (7) is formed by improving soft soil with industrial solid waste-based solidifying agent, and has a thickness of 1.5-2.5m.
3. The composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation according to claim 1, characterized in that, The horizontal and vertical reinforced grid (2) is made of biaxially stretched glass fiber material with a grid size of 50mm×50mm and a tensile strength ≥80kN / m².
4. The composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation according to claim 1, characterized in that, The thickness of the sand and gravel drainage cushion layer (5) is 50-60cm, and the particle size of the crushed stone is no greater than 40mm; the thickness of the steel slag cushion layer (6) is 60-70cm, and the particle size is no greater than 50mm.
5. The composite reinforcement structure for shallow solidification and pile foundation of soft soil foundation according to claim 1, characterized in that, The precast pipe pile (1) is a cement-based composite material pile with a diameter of 50-70cm and a spacing of 3-5 times the diameter.
6. The composite reinforcement structure of shallow solidification and pile foundation for soft soil foundation according to claim 1, characterized in that, The water collection well (4) is equipped with a reinforced concrete well pipe. The reinforced concrete well pipe is located inside the well hole. Its bottom and sides are fixed by backfilling with crushed stone filter material. The upper end of the reinforced concrete well pipe extends out of the well hole and is hinged with a well cover for sealing. A water pump is also installed at the bottom of the reinforced concrete well pipe. The output end of the water pump is connected to a water pipe that extends out of the top of the reinforced concrete well pipe.