Larsen steel sheet pile supporting structure for supporting foundation pit of sandy silt layer foundation

Abstract

The Larsen steel sheet pile supporting structure for the sandy silt layer foundation pit support comprises a supporting assembly, a moving assembly, a top plate and a locking connecting assembly, and the supporting assembly is vertically installed in a foundation pit and used for adjusting the supporting height; the two sets of moving assemblies are arranged and are perpendicular to each other in the moving direction, the two ends of each set of moving assembly are connected with top plates respectively, every two adjacent top plates are connected through an inclined strut assembly, through groove type sliding ways are arranged on the outer surfaces of the top plates, and the sliding ways are connected with a plurality of locking connecting assemblies capable of being adjusted in a sliding mode. The four top plates are moved through the two moving assemblies correspondingly, the four top plates make contact with the inner walls of the four sides of the Larsen steel sheet piles correspondingly, and when the top plates abut against the Larsen steel sheet piles through the moving assemblies, the locking connecting assemblies stretch into U-shaped grooves of the Larsen steel sheet piles to tightly support every two adjacent Larsen steel sheet piles, and looseness is avoided; and the Larsen steel sheet piles are connected more stably.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, and in particular to a Larsen steel sheet pile support structure used for supporting a foundation pit in a sandy silt layer. Background Art

[0002] As a traditional foundation pit support material, Larsen steel sheet pile has been widely used in engineering construction in my country. With its advantages of high strength, fast construction and reusability, it plays an important role in foundation pit retaining projects under various geological conditions.

[0003] Many domestic research institutions and universities have conducted in-depth research on the application of Larsen steel sheet piles under different geological conditions and proposed a variety of improvement and optimization solutions. For example, by changing the shape, size and arrangement of steel sheet piles, their adaptability and stability under complex geological conditions can be improved. At the same time, there are also studies focusing on the combined application of steel sheet piles with other support materials, such as combining with concrete, anchors, etc., to enhance the bearing capacity and deformation control ability of the overall support structure.

[0004] In the prior art, the support structure is fixed to the Larsen steel sheet piles by welding. Since welding is prone to welding defects, including pores, slag inclusions, incomplete penetration, and incomplete fusion, the welded parts of the Larsen steel sheet piles and the support structure may be easily damaged due to stress concentration, which has a certain impact on the strength of the entire Larsen steel sheet pile support structure. In addition, the connection positions of the two steel sheet piles of the Larsen steel sheet piles are prone to loosening, resulting in unstable connections of multiple steel sheet piles, increasing the deformation risk of the Larsen steel sheet piles and subsequent construction risks. In addition, in the prior art, corresponding support structures need to be customized for foundation pit enclosures of different sizes. The existing support structures have a low adaptation range, and customization will lead to increased costs. Summary of the invention

[0005] The object of the present invention is to provide a Larsen steel sheet pile support structure for foundation pit enclosure in sandy silt layer in order to solve the above-mentioned problems, as described below in detail.

[0006] To achieve the above object, the present invention provides the following technical solutions: The Larsen steel sheet pile support structure for supporting a foundation pit in a sandy silt layer provided by the present invention comprises a support assembly, a moving assembly, a top plate and a locking connection assembly, wherein the support assembly is vertically installed in the foundation pit for adjusting the height of the support; The moving components are provided in two groups, and the two groups of moving components are perpendicular to each other in the moving direction, and the two ends of each group of moving components are respectively connected to the top plates, and the two adjacent top plates are connected by the diagonal brace components, and the outer surface of the top plate is provided with a through-groove slide, and the slide is connected with a plurality of slidably adjustable locking connection components; The locking connection assembly comprises a connecting frame, a sliding block, a locking block, a clamping block and a tightening block, the sliding block is fixedly connected to the back side of the connecting frame, and the sliding block is slidably matched with the slide rail, and when the locking connection assembly slides to a preset position, the sliding block is fixedly connected to the top plate through a locking connection piece; two supporting seats are formed in the connecting frame to divide the frame structure into three spaces of left, middle and right, which correspond to the first space, the second space and the third space respectively, and sliding rods are respectively arranged in the upper and lower parts of the first space and the third space, and a spring is sleeved on the sliding rod, one end of the two ends of the spring is connected to the tightening block, and the other end is connected to the inner wall of the connecting frame, and the tightening block is slidably connected to the connecting sleeve; a spring rod is connected in the second space, the spring rod is connected to the locking block, and the inner sides of the two tightening blocks are connected to the clamping blocks, and the locking block is located between the two clamping blocks; When the moving assembly drives the top plate forward to press the Larsen steel sheet pile, the locking connection assembly extends into the U-shaped groove of the Larsen steel sheet pile, the locking block presses the inner wall of the Larsen steel sheet pile to compress the spring rod, and the locking block spreads the clamping block and the pressing block to both sides, so that the pressing block presses the connection between two adjacent Larsen steel sheet piles.

[0007] Preferably, the locking block comprises an arc-shaped driving portion and a flat clamping portion, the two sides of the locking block body are arc-shaped driving portions capable of driving the clamping blocks, and the rear end of the clamping block body is a flat clamping portion arranged between the clamping blocks.

[0008] Preferably, the surface of the clamping block is an arc-shaped surface that matches the arc-shaped driving portion of the locking block.

[0009] Preferably, the movable component includes a support beam, two ends of the support beam are respectively slidably connected to two movable sleeves, two mounting plates 2 are fixed on the support beam, the mounting plates 2 are rotatably connected to a lead screw, and the lead screw is arranged along the length direction of the support beam, the lead screw is threadedly connected to a mounting plate 1, the two mounting plates 1 are respectively fixedly connected to the two movable sleeves, and the opposite ends of the two movable sleeves are fixedly connected to a top plate.

[0010] Preferably, diagonal braces are fixedly connected between the two sides of the movable sleeve and the top plate, and a number of bolts are threadedly connected to both sides of the movable sleeve. The ends of the bolts pass through the movable sleeve to lock the movable sleeve and the support beam, and a plurality of hanging rings are symmetrically arranged on the support beam.

[0011] Preferably, the support assembly includes a support tube and a support seat, a plurality of hydraulic cylinders are vertically arranged in the support tube, and the telescopic ends of the hydraulic cylinders extend to the outside of the support tube and are connected to the support seat, strip groove 1 and strip groove 2 are horizontally opened in the support seat, and strip groove 2 passes through strip groove 1, and the depth of strip groove 1 is greater than the depth of strip groove 2, and strip groove 1 is perpendicular to strip groove 2, and the two support beams cooperate with strip groove 1 and strip groove 2 respectively.

[0012] Preferably, a pressure plate is fixedly installed on the upper side of the support seat for pressing the two support beams downward to fix the two supports, and the bottom of the upper support beam is in contact with the top of the lower support beam. A reinforcement sleeve is fixed on the surface of the support seat, and the reinforcement sleeve is slidably connected to the surface of the support tube. A through hole is opened on the support tube for laying the pipeline of the hydraulic cylinder.

[0013] Preferably, two hanging rings are symmetrically arranged on the surface of the support tube, an annular base is arranged at the bottom of the support tube, a plurality of anchor nails are vertically inserted on the annular base, and the upper side of the annular base is an inclined surface.

[0014] Preferably, the diagonal brace assembly comprises two fixing sleeves, which are respectively hinged to the U-shaped connecting pieces at the end sides of the top plate, and a connecting sleeve with adjustable length is inserted between the two fixing sleeves corresponding to each other in an oblique direction; The connecting sleeve is internally threadedly connected with a movable rod, and the opposite ends of the movable rod and the connecting sleeve are respectively plugged into two fixed sleeves.

[0015] Preferably, the moving components and top plate of the support structure are arranged in two layers, the upper layer is supported on the upper end of the Larsen steel sheet piles, the lower layer is supported on the lower end of the Larsen steel sheet piles, and a cross plate is arranged on the upper edge of the top plate of the upper layer.

[0016] The beneficial effects are: 1. The support assembly is used to support and adjust the height of the moving assembly. The four top plates are moved by two moving assemblies respectively, so that the four top plates are in contact with the inner walls of the four sides of the Larsen steel sheet piles respectively. The four top plates cooperate with the two moving assemblies to support the foundation enclosure. The four diagonal bracing assemblies connect the four top plates of the device in parallel, so that the four top plates can jointly bear the full pressure of the enclosure, making the device more evenly stressed. When the top plate is tightened against the Larsen steel sheet pile by the moving assembly, the locking connection assembly extends into the U-shaped groove of the Larsen steel sheet pile, tightening the two adjacent Larsen steel sheet piles to prevent loosening, making the connection between the Larsen steel sheet piles more stable.

[0017] 2. The two moving components are supported by the support components, which can reduce the vertical pressure exerted by the moving components and the top plate on the Larsen steel sheet piles. At the same time, the support components are provided to facilitate the installation and operation of the moving components. The height of the moving components can be adjusted by the support components, so that the position of the top plate can be adjusted according to the height of the Larsen steel sheet piles, ensuring that the support effect of the top plate on the Larsen steel sheet piles is maximized; 3. There is no welding between the device and the Larsen steel sheet piles. Through the cooperation of four top plates, two moving components and four diagonal bracing components, a frame structure can be formed to support the foundation pit enclosure to ensure the strength and stability of the support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a stereogram of the Larsen steel sheet pile support structure of the present invention; Figure 2 is a top view of the Larsen steel sheet pile support structure of the present invention; Figure 3 This is a front view of the Larsen steel sheet pile support structure of the present invention; Figure 4 The three-dimensional structure of the locking connection assembly of the Larsen steel sheet pile support structure of the present invention Figure 1 ; Figure 5 The three-dimensional structure of the locking connection assembly of the Larsen steel sheet pile support structure of the present invention Figure 2 ; Figure 6 It is a schematic diagram of the structure of the mobile components of the Larsen steel sheet pile support structure of the present invention; Figure 7 It is a three-dimensional structural diagram of the support assembly of the Larsen steel sheet pile support structure of the present invention; Figure 8 It is a structural diagram of the diagonal brace assembly of the Larsen steel sheet pile support structure of the present invention.

[0020] The following are the descriptions of the reference numerals: 1. Support assembly; 2. Moving assembly; 3. Top plate; 301. Slideway; 4. Cross plate; 5. Diagonal brace assembly; 6. Support tube; 7. Ring base; 8. Anchor nail; 9. Hydraulic cylinder; 10. Hanging ring 1; 11. Strip groove 1; 12. Strip groove 2; 13. Support seat; 14. Fixed sleeve; 15. Connecting sleeve; 16. Movable rod; 17. U-shaped connector; 18. Support beam; 19. Movable sleeve; 20. Bolt; 21. Mounting plate 1; 22. Lead screw; 23. Mounting plate 2; 24. Diagonal brace rod; 25. Second hanging ring; 26. Pressing plate; 27. Reinforcement sleeve; 28. Through hole; 29. ​​Locking connection assembly; 2901. Connection frame; 2901a. First space; 2901b. Second space; 2901c. Third space; 2901d. Fixing plate; 2902. Locking connector; 2903. Sliding block; 2904. Locking block; 2904a. Arc-shaped driving part; 2904b. Flat clamping part; 2905. Clamping block; 2906. Tightening block; 2907. Sliding rod; 2908. Spring. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0022] See also Figure 1-Figure 8 As shown, the present invention provides a Larsen steel sheet pile support structure for foundation pit enclosure in sandy silt layer, comprising a support assembly 1, a moving assembly 2, a top plate 3 and a locking connection assembly 29, wherein the support assembly 1 is vertically installed in the foundation pit for adjusting the height of the support. The moving assembly 2 is provided with two groups, and the two groups of moving assemblies 2 are perpendicular to each other in the moving direction, and the two ends of each group of moving assemblies 2 are respectively connected to the top plates 3, and the two adjacent top plates 3 are connected by the diagonal brace assembly 5, and the outer surface of the top plate 3 is provided with a through-groove slide 301, and the slide 301 is connected with a plurality of slidably adjustable locking connection assemblies 29.

[0023] The position of the top plate 3 can be adjusted by the moving assembly 2 so that the top plate 3 presses against the Larsen steel sheet piles, thereby completing the support. The locking connection assembly 29 can extend into the U-shaped groove of the Larsen steel sheet piles to press against the connection of two connected Larsen steel sheet piles, thereby achieving the stability of the Larsen steel sheet pile connection.

[0024] Specifically, refer to Figure 4 and Figure 5As shown, the locking connection assembly 29 includes a connection frame 2901, a slider 2903, a locking block 2904, a clamping block 2905 and a tightening block 2906. The slider 2903 is fixedly connected to the back of the connection frame 2901, and the slider 2903 is slidably matched with the slide 301. When the locking connection component 29 slides to the preset position, the slider 2903 is fixedly connected to the top plate 3 by the locking connection piece 2902; two support seats 13 are formed in the connection frame 2901 to divide the frame structure into three spaces: left, middle and right, which correspond to the first space 2901a, the second space 2901b and the third space 2901c respectively; the first space 2901a and the third space 2901c are respectively provided with sliding rods 2907, and the sliding rods 2907 are sleeved with springs 2908, one end of the spring 2908 is connected to the top tightening block 2906, and the other end is connected to the inner wall of the connection frame 2901, and the top tightening block 2906 is connected to the top tightening block 2906. Block 2906 is slidably connected to the connecting sleeve 15; a spring 2908 rod is connected in the second space 2901b, and the spring 2908 rod is connected to the locking block 2904, and the inner sides of the two tightening blocks 2906 are connected with clamping blocks 2905, and the clamping blocks 2905 are used to cooperate with the locking block 2904 to realize the driving of the tightening block 2906, and the outer side surface of the tightening block 2906 is set to an elastic rubber block, which is pressed on the inner side of the Larsen steel sheet pile; the initial position of the tightening block 2906 is close to the fixed plate 2901d, and the two clamping blocks 2905 set between the two tightening blocks 2906 clamp the locking block 2904 in the middle.

[0025] When the moving component 2 drives the top plate 3 forward to press the Larsen steel sheet pile, the locking connection component 29 extends into the U-shaped groove of the Larsen steel sheet pile, and the locking block 2904 presses the inner wall compression spring 2908 rod of the Larsen steel sheet pile. The locking block 2904 pushes the clamping block 2905 and the pressing block 2906 to both sides, so that the pressing block 2906 presses the connection between two adjacent Larsen steel sheet piles.

[0026] The locking connector 2902 of the above structure can tighten the connection between two Larsen steel sheet piles, making the connection between two adjacent Larsen steel sheet piles more stable, thereby ensuring the stability of the overall connection. A plurality of the locking connectors 2902 are provided, and can be used at intervals corresponding to the Larsen steel sheet piles.

[0027] As a preferred embodiment of the present invention, the locking block 2904 includes an arc-shaped driving portion 2904a and a flat clamping portion 2904b. The two sides of the main body of the locking block 2904 are arc-shaped driving portions 2904a capable of driving the clamping block 2905. The rear end of the clamping block main body is a flat clamping portion 2904b disposed between the clamping blocks 2905. The surface of the clamping block 2905 is an arc that matches the arc-shaped driving portion 2904a of the locking block 2904. When the moving assembly 2 drives the top plate 3 to push against the Larsen steel sheet pile, the locking block 2904 pushes against the inner wall of the U-shaped groove of the Larsen steel sheet pile, compresses the spring 2908 rod, and makes the arc-shaped driving portion 2904a cooperate with the arc-shaped portion of the clamping block 2905, so that the top block 2906 can be stretched to both sides to tighten the side wall connection of the Larsen steel sheet pile.

[0028] For further reference, Figure 6 As shown, the moving assembly 2 includes a support beam 18, two ends of the support beam 18 are slidably connected to two movable sleeves 19, two mounting plates 23 are fixed on the support beam 18, a lead screw 22 is rotatably connected to the mounting plate 23, and the lead screw 22 is arranged along the length direction of the support beam 18, the lead screw 22 is threadedly connected to the mounting plate 1 21, the two mounting plates 1 21 are respectively fixedly connected to the two movable sleeves 19, and the opposite ends of the two movable sleeves 19 are fixedly connected to the top plate 3. By rotating the lead screw 22, the movable sleeve 19 can slide along the support beam 18, thereby driving the top plate 3.

[0029] In order to improve the supporting stability of the top plate 3, diagonal support rods 24 are fixedly connected between the two sides of the movable sleeve 19 and the top plate 3. A number of bolts 20 are threadedly connected to both sides of the movable sleeve 19. The ends of the bolts 20 pass through the movable sleeve 19 to lock the movable sleeve 19 and the support beam 18. A plurality of hanging rings 25 are symmetrically arranged on the support beam 18. The hanging rings 25 are arranged to facilitate the crane to move and transport the movable component 2. The stability of the top plate 3 is improved by the diagonal support rods 24. The bolts 20 are rotated so that the ends of the bolts 20 support the surface of the support beam 18, thereby fixing the movable sleeve 19 on the support beam 18.

[0030] As a preference, refer to Figure 7As shown, the support assembly 1 includes a support tube 6 and a support seat 13, a plurality of hydraulic cylinders 9 are vertically arranged in the support tube 6, and the telescopic ends of the hydraulic cylinders 9 extend to the outside of the support tube 6 and are connected to the support seat 13, a strip groove 11 and a strip groove 2 12 are horizontally opened in the support seat 13, and the strip groove 2 12 penetrates the strip groove 11, and the depth of the strip groove 11 is greater than the depth of the strip groove 2 12, the strip groove 11 is perpendicular to the strip groove 2 12, and the two support beams 18 cooperate with the strip groove 11 and the strip groove 2 12 respectively. Furthermore, a pressure plate 26 is fixedly installed on the upper side of the support seat 13, which is used to press the two support beams 18 downward to fix the two supports, and the bottom of the upper support beam 18 is in contact with the top of the lower support beam 18. A reinforcement sleeve 27 is fixed on the surface of the support seat 13, and the reinforcement sleeve 27 is slidably connected to the surface of the support tube 6. A through hole 28 is opened on the support tube 6 for laying the pipeline of the hydraulic cylinder 9.

[0031] refer to Figure 7 As shown, the surface of the support tube 6 is symmetrically provided with two hanging rings 10, which are convenient for connecting the crane sling through the hanging rings 10, so as to facilitate the movement and transportation of the support tube 6. The bottom of the support tube 6 is provided with an annular base 7, and a plurality of anchors 8 are vertically inserted on the annular base 7, and the upper side of the annular base 7 is an inclined surface. The upper side of the annular base 77 is an inclined surface, and the inclined surface design can reduce the concrete resistance of the annular base 77 when it moves upward.

[0032] As a preference, refer to Figure 8 As shown, the diagonal brace assembly 5 includes two fixing sleeves 14, which are respectively hinged to the U-shaped connecting piece 17 on the end side of the top plate 3, and a connecting sleeve 15 with adjustable length is inserted between the two fixing sleeves 14 corresponding to each other in an oblique direction; the connecting sleeve 15 is internally threaded with a movable rod 16, and the opposite ends of the movable rod 16 and the connecting sleeve 15 are respectively inserted into the two fixing sleeves 14. The diagonal brace assembly 5 is the last part to be installed. The device has a total of four diagonal brace assemblies 5. The four top plates 3 of the device are connected in parallel through the four diagonal brace assemblies 5, so that the four top plates 3 can jointly bear the entire pressure of the enclosure, making the device more evenly stressed; Preferably, the moving assembly 2 and the top plate 3 of the support structure are provided with two layers, the upper layer is supported at the upper end of the Larsen steel sheet pile, the lower layer is supported at the lower end of the Larsen steel sheet pile, and a transverse plate 4 is provided on the upper edge of the top plate 3 located at the upper layer. The Larsen steel sheet pile can be made more stable by the upper and lower layers of support. The support structure of the present application can realize multi-layer support, and is convenient for disassembly and installation.

[0033] It should be noted that after the device is erected, concrete is poured into the foundation pit. After the concrete pouring is completed, the device needs to be withdrawn from the foundation pit before the concrete solidifies.

[0034] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. The Larsen steel sheet pile support structure used for foundation pit protection in sandy silt layer is characterized by: It includes a support assembly, a moving assembly, a top plate and a locking connection assembly, wherein the support assembly is vertically installed in the foundation pit for adjusting the height of the support; The movable components are provided in two groups, and the two groups of movable components are perpendicular to each other in the moving direction. The two ends of each group of movable components are respectively connected to a top plate, and the two adjacent top plates are connected by a diagonal support component. The outer surface of the top plate is provided with a through-groove slide, and the slide is connected to a plurality of slidably adjustable locking connection components.

2. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 1 is characterized by: The locking connection assembly comprises a connecting frame, a sliding block, a locking block, a clamping block and a tightening block, the sliding block is fixedly connected to the back side of the connecting frame, and the sliding block is slidably matched with the slide rail, and when the locking connection assembly slides to a preset position, the sliding block is fixedly connected to the top plate through a locking connection piece; two supporting seats are formed in the connecting frame to divide the frame structure into three spaces of left, middle and right, which correspond to the first space, the second space and the third space respectively, and sliding rods are respectively arranged in the upper and lower parts of the first space and the third space, and a spring is sleeved on the sliding rod, one end of the two ends of the spring is connected to the tightening block, and the other end is connected to the inner wall of the connecting frame, and the tightening block is slidably connected to the connecting sleeve; a spring rod is connected in the second space, the spring rod is connected to the locking block, and the inner sides of the two tightening blocks are connected to the clamping blocks, and the locking block is located between the two clamping blocks; The locking block comprises an arc-shaped driving portion and a flat clamping portion. The two sides of the locking block body are arc-shaped driving portions capable of driving the clamping blocks. The rear end of the clamping block body is a flat clamping portion arranged between the clamping blocks.

3. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 2 is characterized in that: When the moving assembly drives the top plate to push the Larsen steel sheet pile forward, the locking connection assembly extends into the U-shaped groove of the Larsen steel sheet pile, the locking block pushes the inner wall of the Larsen steel sheet pile to compress the spring rod, and the locking block opens the clamping block and the pushing block to both sides, so that the pushing block presses the connection between two adjacent Larsen steel sheet piles; The surface of the clamping block is an arc shape that matches the arc-shaped driving portion of the locking block.

4. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 1 is characterized by: The movable assembly includes a support beam, two ends of the support beam are slidably connected to two movable sleeves, two mounting plates 2 are fixed on the support beam, a lead screw is rotatably connected to the mounting plate 2, and the lead screw is arranged along the length direction of the support beam, the lead screw is threadedly connected to the mounting plate 1, the two mounting plates 1 are fixedly connected to the two movable sleeves, and the opposite ends of the two movable sleeves are fixedly connected to a top plate.

5. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 4 is characterized in that: Diagonal braces are fixedly connected between the two sides of the movable sleeve and the top plate, and a number of bolts are threadedly connected to both sides of the movable sleeve. The ends of the bolts pass through the movable sleeve to lock the movable sleeve and the support beam, and a plurality of hanging rings are symmetrically arranged on the support beam.

6. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 1 is characterized by: The support assembly includes a support tube and a support seat, a plurality of hydraulic cylinders are vertically arranged in the support tube, and the telescopic ends of the hydraulic cylinders extend to the outside of the support tube and are connected to the support seat, a strip groove 1 and a strip groove 2 are horizontally opened in the support seat, and the strip groove 2 penetrates the strip groove 1, and the depth of the strip groove 1 is greater than the depth of the strip groove 2, the strip groove 1 is perpendicular to the strip groove 2, and the two support beams cooperate with the strip groove 1 and the strip groove 2 respectively.

7. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 6 is characterized by: A pressure plate is fixedly installed on the upper side of the support seat, which is used to press the two support beams downward to fix the two supports, and the bottom of the upper support beam is in contact with the top of the lower support beam. A reinforcement sleeve is fixed on the surface of the support seat, and the reinforcement sleeve is slidably connected to the surface of the support tube. A through hole is opened on the support tube for laying the pipeline of the hydraulic cylinder.

8. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 7 is characterized in that: Two hanging rings are symmetrically arranged on the surface of the support tube, and an annular base is arranged at the bottom of the support tube. A plurality of anchor nails are vertically inserted on the annular base, and the upper side of the annular base is an inclined surface.

9. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 1 is characterized by: The diagonal brace assembly includes two fixing sleeves, which are respectively hinged to the U-shaped connecting pieces on the end sides of the top plate, and a connecting sleeve with adjustable length is inserted between the two fixing sleeves corresponding to each other in an oblique direction; The connecting sleeve is internally threadedly connected with a movable rod, and the opposite ends of the movable rod and the fixing tube are respectively plugged into two fixing sleeves.

10. The Larsen steel sheet pile support structure for foundation pit protection in sandy silt layer according to claim 1, characterized in that: The moving components and top plate of the support structure are arranged in two layers, the upper layer is supported on the upper end of the Larsen steel sheet pile, the lower layer is supported on the lower end of the Larsen steel sheet pile, and a transverse plate is arranged on the upper edge of the top plate of the upper layer.

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