Soft soil foundation Larsen steel sheet pile supporting combined structure

Abstract

The utility model discloses an innovative soft soil foundation Larsen steel sheet pile support combined structure, which is characterized in that a U-shaped steel sheet pile and a T-shaped steel sheet pile are combined through a U-shaped lock catch structure to form a closed cavity, the U-shaped steel sheet pile is used as a main body support structure, and a U-shaped lock catch is additionally arranged on a waist plate to fix the T-shaped steel sheet pile. Meanwhile, according to the design of the T-shaped steel sheet piles, lock catches are arranged at the two ends of the waist plate, the T-shaped steel sheet piles are stably connected with the U-shaped steel sheet piles, reinforcing mixed materials and anti-seepage treatment materials are injected into the cavities through grouting pipes, and reinforcing and anti-seepage treatment of the soft soil foundation are achieved. In addition, the grouting pipes are arranged on the surfaces of the U-shaped steel sheet piles and the T-shaped steel sheet piles, so that the construction process is optimized, and the construction efficiency is improved; according to the structure, the consolidation strength of the soft soil foundation is remarkably improved, the permeability is remarkably reduced, the lateral bending resistance strength of the structure is enhanced through the occlusion type lock catch, meanwhile, different leakage conditions can be flexibly coped, construction monitoring is facilitated, and double improvement of the construction efficiency and the structure safety is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of foundation pit support technology, specifically relating to a Larsen sheet pile support composite structure for soft soil foundations. Background Technology

[0002] In recent years, more and more foundation reinforcement techniques have been applied to deep foundation pit retaining projects. The construction methods and support structures for complex soft soil foundation reinforcement directly affect the bearing capacity of the foundation and the stability of the infrastructure project. Based on theoretical analysis and construction experience, this study examines the selection of foundation treatment methods, support forms, treatment depth, and construction methods. It concludes that, under the premise of reasonably controlling key parameters and taking appropriate measures, adopting a reasonable Larssen sheet pile support structure according to the characteristics of the soft soil foundation environment is a feasible, relatively economical, and reasonable construction method.

[0003] For soft soil foundations characterized by high water content, large void ratio, high compressibility, low shear strength, poor bearing capacity, and large settlement, traditional Larssen sheet pile structures cannot prevent water from entering the retaining structure through the U-shaped interlocking gaps. In addition, the material of Larssen sheet piles themselves may lead to insufficient bending stiffness and deformation at the U-shaped interlocking points, resulting in excessively large U-shaped interlocking gaps at the sheet pile connections. Special water-stopping treatment is required for Larssen sheet pile leakage in the later stages. If the treatment is not timely, water seepage accidents may occur, endangering the safety of subsequent construction.

[0004] A search revealed that utility model CN110939122A provides a self-grouting reinforced composite Larssen sheet pile, comprising a web, side plates, fins, and grouting pipes. The side plates are symmetrically distributed on both sides of the web along the web axis and form a groove-like structure with the web. The fins are perpendicularly connected to the front end face of the web, and the grouting pipes are evenly distributed on the front end face of the web. However, this utility model still has the problem of excessively large U-shaped locking gaps at the connection of the sheet piles, requiring special water-stopping treatment for leakage of the Larssen sheet piles in the later stages. Summary of the Invention

[0005] To address the problem that traditional Larssen sheet pile structures cannot prevent water from entering the retaining structure through the U-shaped interlocking gaps, this invention proposes a combined Larssen sheet pile support structure for soft soil foundations.

[0006] A Larsen sheet pile support structure for soft soil foundation includes U-shaped sheet piles and T-shaped sheet piles. Multiple U-shaped sheet piles are connected in sequence, and the T-shaped sheet piles are matched and restrained with the spaced U-shaped sheet piles. A cavity is formed between the U-shaped sheet piles and the T-shaped sheet piles.

[0007] Compared to traditional U-shaped sheet piles, this method adds a U-shaped locking structure and T-shaped sheet piles to the traditional Larssen sheet pile structure. The U-shaped locking structure connects and fixes the T-shaped sheet piles to the U-shaped sheet piles, forming a cavity at the connection point of the U-shaped sheet piles. Reinforcing and seepage-proofing materials are injected into the cavity through grouting pipes to enhance, reinforce, and prevent seepage in soft soil foundations, thus avoiding potential leakage hazards within the support and retaining structure of soft soil foundation pits.

[0008] Furthermore, when reinforcing and preventing seepage in soft soil foundations, the grouting pipe injects reinforcing mixed material when the U-shaped steel sheet piles are inserted into the soil. This allows the material to diffuse within the soil on one side of the cavity and the U-shaped steel sheet pile's retaining surface. The grout encapsulates the soil clumps and the pores between soil particles, while the cracks are filled with cement particles. The dicalcium silicate in the cement undergoes hydrolysis and hydration reactions to generate calcium hydroxide. The calcium hydroxide reacts with the grouting water glass to generate finely dispersed hydrated calcium silicate gel in the soil on one side of the cavity and the U-shaped steel sheet pile's retaining surface. After solidification, this forms a cement-stabilized stone body with high strength and good water stability, thus achieving a gelled state. This increases the consolidation strength of the soft soil foundation and further reduces its permeability.

[0009] Furthermore, the U-shaped sheet pile includes a first U-shaped sheet pile and a second U-shaped sheet pile. The U-shaped sheet pile includes a U-shaped sheet pile waist plate and a U-shaped sheet pile foot plate. The first U-shaped sheet pile is connected with a U-shaped lock. The U-shaped lock is located on the surface of the first U-shaped sheet pile opposite to the U-shaped opening. The foot plate of the U-shaped sheet pile is provided with a first lock at the end facing the U-shaped opening. At least one grouting pipe is installed on the surface of the U-shaped sheet pile.

[0010] Furthermore, the T-shaped sheet pile includes a T-shaped sheet pile foot plate, and a T-shaped sheet pile waist plate is vertically connected to the T-shaped sheet pile foot plate. Second locking buckles are provided at both ends of the T-shaped sheet pile waist plate. At least one grouting pipe is installed on the surface of the T-shaped sheet pile. By installing grouting pipes on the surfaces of the T-shaped and U-shaped sheet piles, grout is injected into the end of the sheet pile through the grouting pipes during Larssen sheet pile construction. This grouting causes seepage, splitting, and spreading in the soil surrounding the sheet pile. Simultaneously, the water jet effect facilitates easier entry of the Larssen sheet pile into soft soil foundations, further improving work efficiency and shortening the construction cycle.

[0011] Furthermore, the spaced U-shaped steel sheet piles and T-shaped steel sheet pile waist plates are limited by a U-shaped lock and a second lock; the U-shaped lock includes two locks with openings facing each other, and the U-shaped lock can simultaneously accommodate two opposing second locks.

[0012] Furthermore, the U-shaped sheet piles are connected by a first U-shaped sheet pile or a second U-shaped sheet pile, and adjacent U-shaped sheet piles are limited by a first locking buckle; the U-shaped sheet piles are used as the first support structure in construction, and a U-shaped locking structure is added to the waist plate of the U-shaped sheet piles to fix the T-shaped sheet piles, and a water-facing surface is set to treat the seepage of the sheet piles;

[0013] Furthermore, the second U-shaped sheet pile is a conventional U-shaped sheet pile without U-shaped locking buckles. When using it, depending on the specific construction conditions, all first U-shaped sheet piles can be selected, or the second U-shaped sheet piles and the first U-shaped sheet piles can be installed alternately, further reducing construction costs.

[0014] Furthermore, when leakage occurs in the first U-shaped sheet pile, the T-shaped sheet pile is located at the interlocking joint of the first U-shaped sheet pile. The T-shaped sheet pile plays a seepage prevention role. The seepage prevention role of the second T-shaped sheet pile ensures that leakage at the interlocking joint can be reduced. The T-shaped structure also helps to increase the lateral bending strength of the Larssen sheet pile composite structure, avoiding more serious leakage problems.

[0015] Furthermore, a bearing plate is provided at the end of the T-shaped steel pile plate facing the U-shaped steel sheet pile. The length of the T-shaped steel pile plate ensures that when the U-shaped locking buckle accommodates two opposing second locking buckles, there is a gap between the second locking buckle and the surface of the first U-shaped steel sheet pile. This ensures sufficient space during the installation of the T-shaped steel pile plate, preventing direct friction or collision between the T-shaped steel pile plates and avoiding structural damage. At the same time, the bearing plate helps the T-shaped steel pile plate and the U-shaped steel sheet pile to make better contact, preventing misalignment of the T-shaped steel pile plate under the pressure difference of the soil layers and improving the overall stability of the structure.

[0016] Furthermore, the side of the T-shaped steel pile plate away from the chamber is the water-facing side.

[0017] Furthermore, the side of the U-shaped steel sheet piles connected in sequence away from the chamber serves as the retaining surface; the water-facing side and the retaining surface are set up to distinguish their functions and facilitate construction.

[0018] Furthermore, the U-shaped steel sheet piles and the T-shaped steel sheet piles are detachably equipped with lifting lugs on their surfaces; this facilitates movement and construction installation.

[0019] Furthermore, the surfaces of the U-shaped steel sheet piles and the T-shaped steel sheet piles are provided with an anti-corrosion paint layer.

[0020] A construction method for a Larssen sheet pile supported composite structure on soft soil foundation includes the following steps:

[0021] 1) When constructing Larssen sheet piles on soft soil foundations, first construct U-shaped sheet piles and connect the grouting pipes on the foot plates at both ends of the sheet piles;

[0022] 2) While the U-shaped steel sheet pile is being inserted into the soil, the grouting pipe booster pump is turned on. At the same time as the U-shaped steel sheet pile is being constructed, the nozzle forms a water jet to cut the surrounding soil, achieving cutting while penetrating, which facilitates the construction of the U-shaped steel sheet pile.

[0023] 3) When the U-shaped steel sheet pile is inserted into the soil, the grouting pipe sprays the reinforcing mixture, which can spread in the soil around the U-shaped steel sheet pile. The grout encapsulates the soil clumps and the pores between the soil. The cracks are filled with cement particles. The dicalcium silicate in the cement undergoes hydrolysis and hydration reaction to generate calcium hydroxide. Subsequently, the calcium hydroxide formed by the reinforcing mixture reacts with the grouting water glass to generate finely dispersed hydrated calcium silicate gel. After solidification, it forms a cement stone body with high strength and good water stability, thereby increasing the consolidation strength of the soft soil foundation and reducing its permeability.

[0024] 4) The U-shaped steel sheet piles form a closed steel sheet pile structure based on the first locking buckle. While excavating the interior, an internal support structure is used for support. Observe the interior of the U-shaped steel sheet pile structure and check whether there is any forking or leakage at the U-shaped locking buckle.

[0025] 5) Monitor the lateral displacement of the sheet piles regularly every day. If the water content of the soft soil base layer is high and the leakage is serious, install T-shaped sheet piles at the first interlocking connection of all U-shaped sheet piles to improve the overall anti-leakage capacity of the structure.

[0026] If the moisture content of the soft soil base layer is low and seepage occurs sporadically, T-shaped steel sheet piles should be driven in time at the first locking connection of the U-shaped steel sheet pile at the seepage point.

[0027] The specific installation details of the T-shaped steel sheet piles will be arranged according to the specific construction conditions.

[0028] 6) Before driving the T-shaped steel sheet piles, fix the grouting pipes on both sides of the T-shaped steel sheet pile foot plate, turn on the grouting pump, and at the same time as the T-shaped steel sheet pile is inserted into the soil, the leakage treatment material in the internal grouting pipe is sprayed and fully mixed with the surrounding soil, so that the soil in the cavity is in a cemented state.

[0029] 7) When the T-shaped steel sheet pile construction is completed, the shotcrete is completed. This ensures that the T-shaped steel sheet piles play a seepage prevention role on the water-facing side. At the same time, the seepage treatment material will quickly solidify the soil inside the cavity between the T-shaped steel sheet piles and the U-shaped steel sheet piles into a whole, improving the integrity of the steel sheet pile composite structure. This ensures that the seepage treatment of the steel sheet pile support structure is timely and effective in complex soft soil environments.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Enhanced reinforcement and seepage prevention performance: By injecting reinforcement composite materials and seepage prevention materials into the cavity formed between U-shaped and T-shaped steel sheet piles, the consolidation strength of the soft soil foundation is significantly enhanced and its permeability is reduced; optimized structure and improved efficiency:

[0032] 2. Improved structural strength: The combined structure of U-shaped steel sheet piles and T-shaped steel sheet piles, through interlocking locking mechanism, enhances the structure's resistance to lateral bending.

[0033] 3. Improved construction efficiency: The installation of T-shaped steel sheet piles not only plays a role in seepage prevention, but also optimizes the construction process, making it easier for Larssen steel sheet piles to enter soft soil foundations, thereby improving work efficiency and shortening the construction cycle.

[0034] 4. Flexible handling of leakage problems: This structure can flexibly handle leakage problems under different conditions. When the water content of the soft soil base layer is high, resulting in serious leakage, T-shaped steel sheet piles are installed throughout to improve the overall seepage resistance. When leakage occurs sporadically, T-shaped steel sheet piles are promptly driven at the leakage points. The specific installation of T-shaped steel sheet piles can be flexibly adjusted according to the construction situation, ensuring a balance between construction efficiency and structural safety.

[0035] 5. Facilitates construction and monitoring: The detachable lifting lugs on the surface of U-shaped and T-shaped steel sheet piles facilitate movement and installation. During construction, regular monitoring of the lateral displacement of the steel sheet piles allows for timely detection and handling of potential leakage problems.

[0036] 6. Enhanced Integrity and Durability: The application of an anti-corrosion paint layer improves the durability of the sheet piles and extends their service life. The leakage treatment material rapidly solidifies the soil inside the cavity between the T-shaped and U-shaped sheet piles, enhancing the overall integrity of the sheet pile composite structure. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A top view A of a Larsen sheet pile support composite structure for soft soil foundation;

[0039] Figure 2 A top view (B) of a Larsen sheet pile support composite structure for soft soil foundations;

[0040] Figure 3 This is a top view of the first U-shaped steel pile plate;

[0041] Figure 4 Schematic diagram A of the first U-shaped steel pile plate structure;

[0042] Figure 5 Schematic diagram B of the first U-shaped steel pile plate structure;

[0043] Figure 6 This is a top view of the second U-shaped steel pile plate;

[0044] Figure 7 Schematic diagram A of the second U-shaped steel pile plate structure;

[0045] Figure 8 Schematic diagram B of the second U-shaped steel pile plate structure;

[0046] Figure 9 This is a top view of a T-shaped steel pile plate.

[0047] Figure 10 Schematic diagram A of T-shaped steel pile-plate structure;

[0048] Figure 11 Schematic diagram B of T-shaped steel pile plate structure.

[0049] In the diagram: 1. U-shaped sheet pile; 101. U-shaped locking ring; 102. U-shaped sheet pile waist plate; 103. First locking ring; 104. U-shaped sheet pile foot plate; 2. T-shaped sheet pile; 201. T-shaped sheet pile foot plate; 202. T-shaped sheet pile waist plate; 203. Second locking ring; 3. Grouting pipe; 4. Chamber; 5. First U-shaped sheet pile; 6. Second U-shaped sheet pile. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0051] The application principle of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] like Figure 1-7 As shown: A Larssen sheet pile support structure for soft soil foundation includes U-shaped sheet piles 1 and T-shaped sheet piles 2. Multiple U-shaped sheet piles 1 are connected in sequence. The T-shaped sheet piles 2 cooperate with and limit the spaced U-shaped sheet piles 1. A cavity 4 is formed between the U-shaped sheet piles 1 and the T-shaped sheet piles 2.

[0054] The U-shaped sheet pile 1 includes a first U-shaped sheet pile 5 and a second U-shaped sheet pile 6. The U-shaped sheet pile 1 includes a U-shaped sheet pile waist plate 102 and a U-shaped sheet pile foot plate 104. The first U-shaped sheet pile 5 is connected with a U-shaped lock 101. The U-shaped lock 101 is located on the surface of the first U-shaped sheet pile 5 opposite to the U-shaped opening. The U-shaped sheet pile foot plate 104 is provided with a first lock 103 at one end facing the U-shaped opening. At least one grouting pipe 3 is installed on the surface of the U-shaped sheet pile 1.

[0055] The T-shaped steel sheet pile 2 includes a T-shaped steel sheet foot plate 201, and a T-shaped steel sheet waist plate 202 is vertically connected to the T-shaped steel sheet foot plate 201. The two ends of the T-shaped steel sheet waist plate 202 are provided with second locking buckles 203. At least one grouting pipe 3 is installed on the surface of the T-shaped steel sheet pile 2.

[0056] The U-shaped steel sheet piles 1 and T-shaped steel sheet waist plates 202 are spaced apart and limited by the cooperation of U-shaped locks 101 and second locks 203; the U-shaped locks 101 includes two locks with openings opposite each other, and the U-shaped locks 101 can simultaneously accommodate two opposite second locks 203.

[0057] The U-shaped sheet piles 1 are connected by a first U-shaped sheet pile 5 or a second U-shaped sheet pile 6, and the adjacent U-shaped sheet piles 1 are limited by a first locking buckle 103.

[0058] The T-shaped steel pile foot plate 201 is provided with a bearing plate at one end facing the U-shaped steel sheet pile 1. The length of the T-shaped steel pile foot plate 201 ensures that when the U-shaped locking buckle 101 accommodates two opposing second locking buckles 203, there is a gap between the second locking buckle 203 and the surface of the first U-shaped steel sheet pile 5.

[0059] The side of the T-shaped steel pile plate waist plate 202 away from the chamber 4 is the water-facing side.

[0060] The side of the U-shaped steel sheet piles 1 connected in sequence away from the chamber 4 is the retaining surface.

[0061] The U-shaped sheet pile 1 and the T-shaped sheet pile 2 are detachably equipped with lifting lugs.

[0062] The surfaces of the U-shaped steel sheet pile 1 and the T-shaped steel sheet pile 2 are provided with an anti-corrosion paint layer.

[0063] Example 2

[0064] A construction method for a Larssen sheet pile supported composite structure on soft soil foundation includes the following steps:

[0065] 1) When constructing Larssen sheet piles on soft soil foundation, first construct U-shaped sheet piles 1 and connect the grouting pipes 3 on the foot plates at both ends of the sheet piles;

[0066] 2) While the U-shaped steel sheet pile 1 is being inserted into the soil, the booster pump of the grouting pipe 3 is turned on. At the same time as the U-shaped steel sheet pile 1 is being constructed, the nozzle forms a water jet cutting motion on the surrounding soil, which allows for cutting and deepening at the same time, making the construction of the U-shaped steel sheet pile 1 easier.

[0067] 3) When the U-shaped steel sheet pile 1 is inserted into the soil, the grouting pipe 3 sprays the reinforcing mixture, which can achieve diffusion in the soil around the U-shaped steel sheet pile 1. The grout encapsulates the soil clumps and the pores between the soil. The cracks are filled with cement particles. The dicalcium silicate in the cement undergoes hydrolysis and hydration reaction to generate calcium hydroxide. Subsequently, the calcium hydroxide formed by the reinforcing mixture reacts with the grouting water glass to generate finely dispersed hydrated calcium silicate gel. After solidification, it forms a cement stone body with high strength and good water stability.

[0068] 4) The U-shaped steel sheet pile 1 forms a closed steel sheet pile structure based on the first locking buckle 103. While excavating the interior, an internal support structure is used for support. Observe the interior of the U-shaped steel sheet pile 1 structure and whether there is any fork or leakage at the U-shaped locking buckle 101.

[0069] 5) Monitor the lateral displacement of the sheet piles daily. If the soft soil base layer has a high water content, resulting in severe leakage, install T-shaped sheet piles 2 at all U-shaped sheet pile 1 interlocking connections to improve the overall anti-leakage capacity of the structure.

[0070] If the soft soil base layer has low moisture content and seepage occurs sporadically, T-shaped steel sheet piles 2 should be driven in time at the connection of the first lock 103 of the U-shaped steel sheet pile 1 at the seepage point.

[0071] The specific installation details of the T-shaped steel sheet piles 2 will be arranged according to the specific construction conditions.

[0072] 6) Before driving the T-shaped steel sheet pile 2, fix the grouting pipes 3 on both sides of the T-shaped steel sheet pile foot plate 201, turn on the grouting pump, and at the same time as the T-shaped steel sheet pile 2 is inserted into the soil, the leakage treatment material in the internal grouting pipe 3 is sprayed and fully mixed with the surrounding soil, so that the soil in the chamber 4 is in a cemented state; the second locking buckle 203 on both sides of the T-shaped steel sheet pile 2 cooperates with the U-shaped locking buckle 101 to limit the movement.

[0073] 7) When the T-shaped steel sheet pile 2 is completed, the shotcrete is completed, and the construction is finished.

[0074] Example 3

[0075] like Figure 1-2As shown, this embodiment is basically the same as embodiment 2. The difference from embodiment 2 is that: when installing U-shaped steel sheet piles 1, different combinations of U-shaped steel sheet piles 1 can be selected according to the specific construction conditions. All of them can be connected and installed using the first U-shaped steel sheet piles 5. In subsequent use, T-shaped steel sheet piles 2 can be installed on both sides of the first U-shaped steel sheet piles 5, which has better anti-seepage ability.

[0076] Alternatively, the first U-shaped sheet pile 5 and the second U-shaped sheet pile 6 can be connected at intervals, with the intervals between the first U-shaped sheet piles 5 being limited by T-shaped sheet piles 2. This combination method allows T-shaped sheet piles 2 to be installed on only one side, but reduces the amount of first U-shaped sheet piles 5 used, and the cost is lower than the first combination method.

[0077] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A soft ground foundation Larssen steel sheet pile support combined structure, characterized by: The utility model provides a steel sheet pile, including U type steel sheet pile (1) and T type steel sheet pile (2), a plurality of U type steel sheet pile (1) are connected in turn, T type steel sheet pile (2) is positioned with the cooperation between interval U type steel sheet pile (1), and the cavity (4) is formed between U type steel sheet pile (1) and T type steel sheet pile (2).

2. The combined structure of the Larssen steel sheet pile supporting for soft soil foundation according to claim 1, characterized in that: The U type steel sheet pile (1) includes a first U type steel sheet pile (5) and a second U type steel sheet pile (6), the U type steel sheet pile (1) includes a U type steel sheet pile waist plate (102) and a U type steel sheet pile foot plate (104), the first U type steel sheet pile (5) is connected with a U type lock buckle (101), the U type lock buckle (101) is located on the surface of the first U type steel sheet pile (5) opposite the U type opening, the U type steel sheet pile foot plate (104) is provided with a first lock buckle (103) at one end facing the U type opening, and the surface of the U type steel sheet pile (1) is provided with at least one grouting pipe (3); The T type steel sheet pile (2) includes a T type steel sheet pile foot plate (201), the T type steel sheet pile foot plate (201) is connected with a T type steel sheet pile waist plate (202) vertically, both ends of the T type steel sheet pile waist plate (202) are provided with a second lock buckle (203), and the surface of the T type steel sheet pile (2) is provided with at least one grouting pipe (3).

3. The combined structure of the Larssen steel sheet pile supporting for soft soil foundation according to claim 2, characterized in that: The interval U type steel sheet pile (1) and the T type steel sheet pile waist plate (202) are positioned by the cooperation of the U type lock buckle (101) and the second lock buckle (203); the U type lock buckle (101) includes two lock buckles with openings arranged opposite to each other, and the U type lock buckle (101) includes at least two openings capable of accommodating two second lock buckles (203) arranged opposite to each other at the same time.

4. The combined structure of the Larssen steel sheet pile supporting for soft soil foundation according to claim 3, characterized in that: The interval U type steel sheet pile (1) is connected with the first U type steel sheet pile (5) or the second U type steel sheet pile (6), and the adjacent U type steel sheet pile (1) is positioned by the cooperation of the first lock buckle (103).

5. The combined structure of the Larssen steel sheet pile support for soft soil foundation according to claim 2, characterized in that: The T type steel sheet pile foot plate (201) is provided with a pressure plate at one end facing the U type steel sheet pile (1).

6. The combined structure of the Larssen steel sheet pile support for soft soil foundation according to claim 2, characterized in that: The T type steel sheet pile waist plate (202) is a water-facing side away from the cavity (4).

7. The combined structure of the Larssen steel sheet pile support for soft soil foundation according to claim 2, characterized in that: The U type steel sheet pile (1) connected in turn is a surrounding side away from the cavity (4).

8. The combined structure of the Larssen steel sheet pile support for soft soil foundation according to claim 1, characterized in that: The U type steel sheet pile (1) and the T type steel sheet pile (2) are detachably provided with lifting lugs on the surfaces.

9. The combined structure of the Larssen steel sheet pile support for soft soil foundation according to claim 1, characterized in that: The U type steel sheet pile (1) and the T type steel sheet pile (2) are provided with an anti-corrosion paint layer on the surfaces.

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