A method for reinforcing and quickly recovering a steel sheet pile support in a coastal soft soil layer

Abstract

The application discloses a method for reinforcing and supporting soft soil layers along a coast and rapidly recycling steel sheet piles, and the construction method comprises the following steps: measuring data, formulating a construction scheme, conducting a construction test, correcting a theoretical analysis, organizing implementation, implementing deviation correction, and recycling materials. According to the method, the pore water in the soil is slowly drained by arranging vertical drainage plates, the pore ratio is reduced, the foundation is deformed, the strength of the foundation soil is gradually increased, the drainage distance is shortened by arranging the vertical drainage plates, the consolidation of the foundation is accelerated, the preloading period of the preloading project is shortened, the foundation can reach a good consolidation effect in a short period of time, the growth of the shear strength of the foundation soil is accelerated, the rate of the improvement of the bearing capacity of the foundation is always greater than the rate of the increase of the construction load, and the stability of the foundation is ensured, the vertical supporting system is formed by combining the lock buckle of the pipe pile and the steel sheet pile, so that the rapid enclosure construction is facilitated, the pipe pile and the steel sheet pile are convenient to disassemble and recycle, and the prefabricated assembly construction is realized.

Description

Technical Field

[0001] This invention relates to the field of soft soil reinforcement technology, specifically a method for rapid recovery of coastal soft soil layers supported by sheet piles. Background Technology

[0002] With the development of underground space in my country's urbanization, various types of foundation pits are becoming increasingly common and deeper in urban construction. The impact of foundation pit construction on the surrounding environment is also growing. Because excavation disrupts the balance of earth pressure, the retaining structure inevitably deforms, leading to ground subsidence. The greater the subsidence, the greater the impact on the surrounding environment and the greater the economic losses. In severe cases, it can even lead to foundation pit collapse and personal injury accidents. Therefore, adopting reasonable reinforcement techniques to control deformation and ensure foundation pit stability is crucial. Reinforcement techniques can improve soil strength, reduce soil compressibility, effectively control foundation pit deformation, and ensure the safety of the construction foundation pit itself and the surrounding environment. As the complexity of foundation pit projects increases, foundation pit reinforcement must not only aim to improve strength but also control foundation pit deformation. However, when reinforcing soft soil layers, it is impossible to address the settlement and stability issues of the foundation, resulting in the rate of increase in foundation bearing capacity being less than the rate of increase in construction load, reducing foundation stability, and in severe cases, even leading to foundation pit collapse and personal injury accidents. Summary of the Invention

[0003] The purpose of this invention is to provide a method for reinforcing coastal soft soil layers and rapidly recovering sheet pile support, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for reinforcing coastal soft soil layers and rapidly recovering sheet pile support, comprising the following seven steps: measured data → construction plan formulation → construction testing → theoretical analysis correction → organization and implementation → implementation correction → material recovery.

[0006] Step 1: Conduct on-site research on the characteristics of coastal soft soil strata, understand the current engineering situation of small foundation pit design and construction in coastal soft soil strata, summarize relevant technical requirements and practical engineering experience, collect and organize relevant data, compile corresponding technical solutions, formulate safeguard measures, and modify relevant technical measures based on the demonstration results through research group discussions and on-site implementation.

[0007] Step Two: Based on the confirmed technical data, the project team will develop an implementation organization design and plan, and formulate personnel allocation, material and equipment plans, and schedule plans.

[0008] Step 3: Using a combination of methods including field measurement, numerical simulation, and field experiments, we systematically studied the effect of reinforcement technology on the deformation control of small foundation pits in coastal soft soil.

[0009] Numerical simulation was used to compare the effects of reinforcement methods such as prestressed pipe piles and drainage consolidation on soil parameters. The m value of the foundation pit was analyzed by adjusting soil layer parameters, reinforcement width and depth, and deformation modulus of composite soil. The standard formula for m was revised by comprehensively considering various factors.

[0010] Step 4: Use computer technology to build a model and simulate the entire operation process to increase the accuracy and feasibility of procedures and processes (using on-site measurements, theoretical inversion, and numerical simulation with the help of large-scale finite element analysis software ABAQUS and MIDAS-GTS, conduct research on soil reinforcement and foundation pit support testing in coastal soft soil strata, and use the measured results as a benchmark to correct the methods and key parameters of theoretical analysis, providing theoretical and practical references for the future design of similar projects).

[0011] Step 5: Implement in-process control and full-process tracking control to ensure work quality.

[0012] (1) Research on construction technology for soft soil layer reinforcement

[0013] 1) Use three-dimensional calculation software to verify the bearing capacity and settlement of the soft soil layer to ensure that the quality meets the standards.

[0014] 2) By studying the drainage construction process, the final construction method was determined.

[0015] 3) Through research on process control, determine the key points of construction quality control.

[0016] (2) Construction methods for reinforcing soft soil layers

[0017] 1) Foundation treatment: Preloading is carried out first to drain the pore water in the soil, gradually consolidate it, cause the foundation to settle, and at the same time the strength gradually increases;

[0018] 2) Prepare materials: Personnel should check the construction tools and drainage equipment to ensure that all materials are complete;

[0019] 3) Material selection: precast reinforcement components, sheet piles, pipe piles, drainage boards; grouting pipes;

[0020] 4) Specific operating steps

[0021] First, the pipe piles are positioned and marked, as well as the steel sheet piles, to determine their location and quantity.

[0022] Secondly, the pipe piles and sheet piles are sequentially and alternately connected at the marked positions to form a vertical support system;

[0023] Third, measure the position of the drainage board and grouting pipe, and determine the number and position of the drainage board and grouting pipe to be inserted.

[0024] Fourth, insert the drainage board and grouting pipe at the determined location into the soft soil layer;

[0025] Fifth, a topsoil layer is laid on the soft soil layer. After the bamboo mesh and bamboo posts are assembled on the construction site, the reinforcing components made of bamboo mesh and bamboo posts are laid on the topsoil using hoisting equipment.

[0026] Sixth, a sand cushion layer is laid on the reinforced component, and a thin film sealing layer is laid on the sand cushion layer;

[0027] Seventh, vacuum pumps are used to extract air from the sand pads and sand wells to generate negative pressure, causing groundwater to be discharged to the surface along the vertical drainage path, thus accelerating the drainage and consolidation of the foundation; that is, vacuum preloading is to reduce pore water pressure and increase effective stress under the condition of constant total pressure, thereby compressing the soil and increasing its strength.

[0028] Step Six: Collect and analyze on-site data. Analyze influencing factors by collecting on-site data and creating a statistical table of quality defects. Then analyze the reasons for such results. Combine this with on-site monitoring methods to continuously adjust construction techniques, study coastal soft soil reinforcement technology measures and empirical parameters, and refine corresponding soft soil small foundation pit deformation control and construction techniques.

[0029] Step 7: The pipe piles and sheet piles are interlocked to form a vertical support system, which facilitates rapid retaining construction and easy disassembly of the pipe piles and sheet piles for recycling, realizing prefabricated assembly construction.

[0030] Furthermore, the bamboo mesh and bamboo columns made of bamboo are used to reinforce the soft soil foundation. The bamboo mesh and bamboo columns act as a reinforcing pad, which can improve the bearing capacity of the soft soil foundation. At the same time, bamboo is used because it has a short growth cycle, has the advantages of structural stability, low price, and convenient construction. In addition, compared with the use of geogrid, it avoids the problem of environmental pollution caused by the difficulty of decomposition of geogrid in the soil.

[0031] Furthermore, by arranging vertical drainage boards, the pore water in the soil is slowly drained, the void ratio decreases, the foundation undergoes consolidation deformation, and the strength of the foundation soil gradually increases. Setting up vertical drainage boards can shorten the drainage distance, thereby accelerating the consolidation of the foundation, shortening the preloading period of the preloading project, and enabling it to achieve a better consolidation effect in a short period of time, so that settlement is completed ahead of schedule; it also accelerates the increase of the shear strength of the foundation soil, so that the rate of increase of the foundation bearing capacity is always greater than the rate of increase of the construction load, thereby ensuring the stability of the foundation and solving the problems of foundation settlement and stability.

[0032] Furthermore, the pipe piles are lightweight and have good bending resistance, while the sheet piles have good water and soil stopping effects. The pipe piles and sheet piles are interlocked to form a vertical support system, which facilitates rapid retaining construction and easy disassembly of the pipe piles and sheet piles for recycling, realizing prefabricated assembly construction. At the same time, this combination retaining method for foundation pits has significant environmental protection effects, which can greatly reduce the amount of soil excavation and concrete used during construction, effectively protecting land resources.

[0033] Compared with existing technologies, the beneficial effects of this invention are as follows: This method for reinforcing coastal soft soil strata and rapidly recovering sheet pile support, by arranging vertical drainage boards, allows pore water in the soil to be slowly drained, reducing the porosity, causing consolidation deformation of the foundation, and gradually increasing the strength of the foundation soil. The vertical drainage boards shorten the drainage distance, accelerating foundation consolidation, shortening the preloading period of preloading projects, achieving better consolidation results in a short period, and completing settlement ahead of schedule; it also accelerates the increase in the shear strength of the foundation soil, increasing the bearing capacity of the foundation. The rate of increase always exceeds the rate of increase of construction load to ensure the stability of the foundation, thus solving the problems of foundation settlement and stability. The pipe piles are lightweight and have good bending resistance, while the sheet piles have good water and soil stopping effects. The pipe piles and sheet piles are interlocked to form a vertical support system, which facilitates rapid retaining construction and easy disassembly of the pipe piles and sheet piles for recycling, realizing prefabricated assembly construction. At the same time, this combination retaining method for foundation pits has significant environmental protection effects, which can greatly reduce the amount of soil excavation and concrete used during construction, effectively protecting land resources. Attached Figure Description

[0034] Figure 1 This is a construction drawing of a method for rapid recovery of coastal soft soil strata supported by steel sheet piles, according to the present invention.

[0035] Figure 2 This is a technical roadmap for a rapid recovery method of coastal soft soil strata reinforcement and sheet pile support according to the present invention;

[0036] Figure 3 This is a distribution map of a method for rapid recovery of coastal soft soil strata supported by sheet piles, as described in this invention.

[0037] Figure 4 This is a diagram showing the interlocking of pipe piles and sheet piles in a method for rapid recovery of coastal soft soil layers and sheet pile support according to the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0041] Please see Figure 1-4 The present invention provides an embodiment of a rapid recovery method for coastal soft soil strata reinforcement and sheet pile support, the construction method of which includes the following seven steps: measured data → construction plan formulation → construction test → theoretical analysis correction → organization and implementation → implementation correction → material recovery.

[0042] Step 1: Conduct on-site research on the characteristics of coastal soft soil strata, understand the current engineering situation of small foundation pit design and construction in coastal soft soil strata, summarize relevant technical requirements and practical engineering experience, collect and organize relevant data, compile corresponding technical solutions, formulate safeguard measures, and modify relevant technical measures based on the demonstration results through research group discussions and on-site implementation.

[0043] Step Two: Based on the confirmed technical data, the project team will develop an implementation organization design and plan, and formulate personnel allocation, material and equipment plans, and schedule plans.

[0044] Step 3: Using a combination of methods including field measurement, numerical simulation, and field experiments, we systematically studied the effect of reinforcement technology on the deformation control of small foundation pits in coastal soft soil.

[0045] Numerical simulation was used to compare the effects of reinforcement methods such as prestressed pipe piles and drainage consolidation on soil parameters. The m value of the foundation pit was analyzed by adjusting soil layer parameters, reinforcement width and depth, and deformation modulus of composite soil. The standard formula for m was revised by comprehensively considering various factors.

[0046] Step 4: Use computer technology to build a model and simulate the entire operation process to increase the accuracy and feasibility of procedures and processes (using on-site measurements, theoretical inversion, and numerical simulation with the help of large-scale finite element analysis software ABAQUS and MIDAS-GTS, conduct research on soil reinforcement and foundation pit support testing in coastal soft soil strata, and use the measured results as a benchmark to correct the methods and key parameters of theoretical analysis, providing theoretical and practical references for the future design of similar projects).

[0047] Step 5: Implement in-process control and full-process tracking control to ensure work quality.

[0048] (1) Research on construction technology for soft soil layer reinforcement

[0049] 1) Use three-dimensional calculation software to verify the bearing capacity and settlement of the soft soil layer to ensure that the quality meets the standards.

[0050] 2) By studying the drainage construction process, the final construction method was determined.

[0051] 3) Through research on process control, determine the key points of construction quality control.

[0052] (2) Construction methods for reinforcing soft soil layers

[0053] 1) Foundation treatment: Preloading is carried out first to drain the pore water in the soil, gradually consolidate it, cause the foundation to settle, and at the same time the strength gradually increases;

[0054] 2) Prepare materials: Personnel should check the construction tools and drainage equipment to ensure that all materials are complete;

[0055] 3) Material selection: precast reinforcement components, sheet piles, pipe piles, drainage boards; grouting pipes;

[0056] 4) Specific operating steps

[0057] First, the pipe piles are positioned and marked, as well as the steel sheet piles, to determine their location and quantity.

[0058] Secondly, the pipe piles and sheet piles are sequentially and alternately connected at the marked positions to form a vertical support system;

[0059] Third, measure the position of the drainage board and grouting pipe, and determine the number and position of the drainage board and grouting pipe to be inserted.

[0060] Fourth, the drainage board and grouting pipe at the determined location are inserted into the soft soil layer. The grouting parameters are controlled through the grouting pipe to the soft soil layer at different depths, so as to achieve the purpose of precise reinforcement of the stratum, realize rapid and uniform reinforcement of the stratum, and improve the effect of stratum reinforcement.

[0061] Fifth, a topsoil layer is laid on the soft soil layer. After the bamboo net and bamboo posts are assembled on the construction site, the reinforcing components consisting of bamboo net and bamboo posts are laid on the topsoil using hoisting equipment. The reinforcing components include bamboo net and bamboo posts made of bamboo. Multiple bamboo posts perpendicular to the bamboo net are fixed on the upper surface of the bamboo net. The bamboo net is laid on the surface of the topsoil layer.

[0062] Sixth, a sand cushion layer is laid on the reinforced component, and a thin film sealing layer is laid on the sand cushion layer;

[0063] Seventh, vacuum pumps are used to extract air from the sand pads and sand wells to generate negative pressure, causing groundwater to be discharged to the surface along the vertical drainage path, thus accelerating the drainage and consolidation of the foundation; that is, vacuum preloading is to reduce pore water pressure and increase effective stress under the condition of constant total pressure, thereby compressing the soil and increasing its strength.

[0064] Step Six: Collect and analyze on-site data. Analyze influencing factors by collecting on-site data and creating a statistical table of quality defects. Then analyze the reasons for such results. Combine this with on-site monitoring methods to continuously adjust construction techniques, study coastal soft soil reinforcement technology measures and empirical parameters, and refine corresponding soft soil small foundation pit deformation control and construction techniques.

[0065] Step 7: The pipe piles and sheet piles are interlocked to form a vertical support system, which facilitates rapid retaining construction and easy disassembly of the pipe piles and sheet piles for recycling, realizing prefabricated assembly construction. Example 2

[0066] In step five, when laying prefabricated reinforcement components, bamboo mesh and bamboo columns are used to reinforce the soft soil foundation. The bamboo mesh and bamboo columns act as a reinforcing pad, improving the bearing capacity of the soft soil foundation. Bamboo has advantages such as a short growth cycle, structural stability, low price, and convenient construction. Furthermore, compared to using geogrids, it avoids the environmental pollution problems caused by the slow decomposition of geogrids in the soil. By arranging vertical drainage boards, pore water in the soil is slowly drained, reducing the porosity and causing consolidation deformation of the foundation. The strength of the foundation soil gradually increases. Setting up vertical drainage boards can shorten the drainage distance, accelerating foundation consolidation and shortening the preloading process. The preloading period allows for better consolidation within a short time, enabling settlement to be completed ahead of schedule. It also accelerates the increase in shear strength of the foundation soil, ensuring that the rate of increase in foundation bearing capacity always exceeds the rate of increase in construction load, thus guaranteeing foundation stability and solving the problems of foundation settlement and stability. The lightweight and flexurally strong pipe piles, combined with the effective water and soil sealing of the sheet piles, form a vertical support system using an interlocking connection. This facilitates rapid retaining construction and easy disassembly and recycling of the pipe piles and sheet piles, enabling prefabricated assembly construction. Furthermore, this combined retaining method for the foundation pit has significant environmental benefits, greatly reducing soil extraction and concrete usage during construction, effectively protecting land resources.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for reinforcing coastal soft soil layers and rapidly recovering sheet pile support, comprising the following construction steps: measured data → construction plan formulation → construction testing → theoretical analysis correction → organization and implementation → implementation correction → material recovery, characterized in that... Specifically, it includes the following seven steps: Step 1: Conduct on-site research on the characteristics of coastal soft soil strata, understand the current engineering situation of small foundation pit design and construction in coastal soft soil strata, summarize relevant technical requirements and practical engineering experience, collect and organize relevant data, compile corresponding technical solutions, formulate safeguard measures, and modify relevant technical measures based on the demonstration results through research group discussions and on-site implementation. Step Two: Based on the confirmed technical data, the project team will develop an implementation organization design and plan, and formulate personnel allocation, material and equipment plans, and schedule plans. Step 3: Using a combination of on-site measurement, numerical simulation, and on-site experiments, we systematically studied the control of small foundation pit deformation by reinforcement technology in coastal soft soil. Numerical simulation was used to compare the effects of prestressed pipe piles and drainage consolidation reinforcement on soil parameters. The m-value of the foundation pit was analyzed and studied by adjusting soil layer parameters, reinforcement width and depth, and deformation modulus of composite soil. The standard formula for m-value was revised by comprehensively considering various factors. Step 4: Use computer technology to build a model and simulate the entire operation process to increase the accuracy and feasibility of procedures and processes. By adopting on-site measurements, theoretical inversion, and numerical simulation with the help of large-scale finite element analysis software ABAQUS and MIDAS-GTS, we will conduct research on the soil reinforcement of small foundation pits in coastal soft soil strata and the testing and numerical simulation of foundation pit support. Based on the measured results, we will correct the methods and key parameters of theoretical analysis. Step 5: Implement full-process tracking and control to ensure work quality. (1) Research on construction technology for soft soil layer reinforcement 1) Use 3D calculation software to verify the bearing capacity and settlement of the soft soil layer to ensure that the quality meets the standards; 2) By studying the drainage construction process, the final construction method was determined; 3) Through research on process control, determine the key points of construction quality control; (2) Construction methods for reinforcing soft soil layers 1) Foundation treatment: Preloading is carried out first to drain the pore water in the soil, gradually consolidate it, cause the foundation to settle, and at the same time the strength gradually increases; 2) Prepare materials: Personnel should check the construction tools and drainage equipment to ensure that all materials are complete; 3) Material selection: precast reinforcement components, sheet piles, pipe piles, drainage boards, grouting pipes; 4) Specific operating steps First, the locations and quantities of pipe piles and sheet piles are determined by locating and marking their positions. Secondly, the pipe piles and sheet piles are alternately connected at the corresponding marked positions to form a vertical support system; Third, measure the position of the drainage board and grouting pipe, and determine the number and position of the drainage board and grouting pipe to be inserted. Fourth, insert the drainage board and grouting pipe at the determined location into the soft soil layer; Fifth, a topsoil layer is laid on the soft soil layer. After the bamboo mesh and bamboo posts are assembled on the construction site, the prefabricated reinforcement components made of bamboo mesh and bamboo posts are laid on the topsoil using hoisting equipment. Sixth, a sand cushion layer is laid on the precast reinforced components, and a thin film sealing layer is laid on the sand cushion layer; Seventh, vacuum pumps are used to extract air from the sand cushion layer and sand wells to generate negative pressure, causing groundwater to be discharged to the surface along the vertical drainage path, thus accelerating the drainage and consolidation of the foundation; that is, vacuum preloading is to reduce pore water pressure and increase effective stress under the condition of constant total pressure, thereby compressing the soil and increasing its strength. Step Six: Collect and analyze on-site data. Analyze influencing factors by collecting on-site data and creating a statistical table of quality defects. Then analyze the reasons for such results. Combine this with on-site monitoring methods to continuously adjust construction techniques, study coastal soft soil reinforcement technology measures and empirical parameters, and refine corresponding soft soil small foundation pit deformation control and construction techniques. Step 7: Pipe piles and sheet piles are interlocked to form a vertical support system, which facilitates rapid retaining construction and easy disassembly of pipe piles and sheet piles for recycling, realizing prefabricated assembly construction; Bamboo mesh and bamboo posts are used to reinforce soft soil foundations. The bamboo mesh and bamboo posts act as a reinforcing pad, which can improve the bearing capacity of soft soil foundations. At the same time, bamboo has the advantages of short growth cycle, stable structure, low price and convenient construction. Compared with the use of geogrid, it avoids the problem of environmental pollution caused by the difficulty of decomposition of geogrid in soil.

2. The method for rapid recovery of coastal soft soil strata and sheet pile support according to claim 1, characterized in that: By arranging vertical drainage boards, pore water in the soil is drained, the void ratio is reduced, the foundation undergoes consolidation deformation, and the strength of the foundation soil gradually increases. Setting up vertical drainage boards shortens the drainage distance, thereby accelerating the consolidation of the foundation, shortening the preloading period of the preloading project, and enabling it to achieve a better consolidation effect in a short period of time, so that settlement is completed ahead of schedule. It also accelerates the growth of the shear strength of the foundation soil, ensuring that the rate of increase in the foundation bearing capacity always exceeds the rate of increase in the construction load, thereby guaranteeing the stability of the foundation and solving the problems of foundation settlement and stability.

3. The method for rapid recovery of coastal soft soil strata and sheet pile support according to claim 1, characterized in that: Pipe piles are lightweight and have good bending resistance, while sheet piles have good water and soil stopping effects. Pipe piles and sheet piles are interlocked to form a vertical support system, which facilitates rapid retaining construction and easy disassembly of pipe piles and sheet piles for recycling, realizing prefabricated assembly construction. At the same time, this combination retaining method for foundation pits has significant environmental protection effects, reducing the amount of soil excavation and concrete used during construction, and effectively protecting land resources.

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