A steel sheet pile support structure and construction method for foundation pit engineering

Abstract

This invention relates to the field of sheet pile support technology for foundation pit engineering, specifically a sheet pile support structure and construction method for foundation pit engineering. It includes multiple first sheet piles, second sheet piles, multiple fixing pipes, multiple first connecting plates, and second connecting plates arranged sequentially. The multiple first sheet piles are arranged from left to right, with adjacent first sheet piles abutting each other. This invention also proposes a novel construction method for sheet pile support in foundation pit engineering, including the following steps: Step 1: Lifting the sheet piles; fixing the lifting eye bolts to the upper end of the sheet piles via threads; after connecting the lifting eye bolts to the crane, lifting and moving the sheet piles to the designated construction position. This application, through the combination of fixing pipes and sheet pile embedding and the use of grouting for seepage prevention, can improve the overall stability, impermeability, and design strength of the sheet piles, expanding the application scope of sheet piles in the field of foundation pit support. Furthermore, it is convenient to install, simple to operate, causes minimal construction disturbance, and can be repeatedly recycled.

Description

Technical Field

[0001] This invention relates to the field of novel steel sheet pile support technology for foundation pit engineering, and particularly to a steel sheet pile support structure and construction method for foundation pit engineering. Background Technology

[0002] Foundation pit support is an essential part of foundation pit engineering. Different support methods have a significant impact on the stability of the foundation pit, and also vary in terms of project cost, construction difficulty, and environmental impact.

[0003] In the field of building engineering technology, a foundation pit is a pit structure excavated at the designed foundation location according to the designed foundation elevation and dimensions. During the excavation process, to ensure the safety of the excavation construction and the surrounding structures, the sidewalls of the foundation pit need to be supported and reinforced. Although there are many foundation pit support systems available, the inventors have found shortcomings in actual construction, specifically as follows: For the support system of the foundation pit sidewalls, it provides vertical support to the soil surrounding the pit. Therefore, in actual construction environments, the support system typically traverses multiple soil layers, such as: mixed soil layers, plain soil layers, clay layers, silt layers, silty clay layers, silty clay layers, clayey silt and silty sand layers, gravel layers, and fine sand layers. The strength, engineering properties, and allowable bearing capacity of each soil layer vary, resulting in significant differences in the stress on different parts of the foundation pit support system in the vertical direction. This leads to a considerable reliability risk in the current support system.

[0004] To address the aforementioned technical problems, Chinese Patent Publication No. CN109024610A discloses a sheet pile waler support system and a foundation pit construction method using this system. The sheet pile waler support system of this application uses a series of interconnected sheet piles to form a sheet pile wall supporting the sidewall of the foundation pit. Furthermore, internal support components are installed on the inner wall of the sheet pile wall to provide horizontal support. This significantly improves the reliability of the sheet pile wall's support for the foundation pit sidewall, ensuring reliable support even when the sheet piles penetrate multiple soil layers. On the other hand, in actual construction, the soil layers at the foundation pit can be detected to determine the location of each soil layer. The physical and mechanical properties of the sheet pile wall are analyzed to determine its stress distribution. Internal support components are installed at dangerous locations within the sheet pile wall, further ensuring the reliability of the subsequent system support. Furthermore, the foundation pit construction method of this application employs repeated hammering, pulling out, and inserting during the sheet pile insertion process. After hammering for a period, the sheet pile is pulled out to a certain height, allowing water to seep into its underside. This significantly reduces the resistance encountered during sheet pile insertion, lowering the difficulty of insertion. On the other hand, the interruption of hammering also reduces the risk of overheating and deformation at the hammered end of the sheet pile, further improving the stability and reliability of the sheet pile support.

[0005] Traditional Larssen sheet piles have been widely used in foundation pit support, with advantages such as simple construction, small construction disturbance, and recyclability. However, their design strength is relatively low and their overall integrity is poor. They are often not suitable for deep foundation pits or foundation pits with high anti-seepage requirements, so improvements are needed. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a steel sheet pile support structure and construction method for foundation pit engineering.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A sheet pile support structure for foundation pit engineering includes a plurality of first sheet piles, second sheet piles, a plurality of fixing pipes, a plurality of first connecting plates and second connecting plates arranged sequentially. The plurality of first sheet piles are arranged sequentially from left to right, with two adjacent first sheet piles abutting each other. The second sheet pile abuts against the rightmost first sheet pile. The second sheet pile and the first sheet pile abutting against it are arranged perpendicularly. The plurality of fixing pipes are respectively arranged between two adjacent first sheet piles and between a second sheet pile and the rightmost first sheet pile. A first connecting plate is provided through the fixing pipe between two adjacent first sheet piles, and a second connecting plate is provided through the fixing pipe between the second sheet pile and the rightmost first sheet pile.

[0009] The first sheet pile has notches at both ends and the second sheet pile has notches at one end. The two notches on the same first sheet pile are staggered. The thickness of the second sheet pile is the same as the width of the notch. The middle of the side wall of one end of the notch and the middle of the middle of the end of the second sheet pile without a notch are provided with slots. The fixing pipe is inserted between two adjacent slots. The upper ends of two adjacent first sheet piles abut against a first connecting plate. The fixing pipe is inserted through the first connecting plate. The first connecting plate and the two first sheet piles abutting against it are detachably connected. The second sheet pile and the first sheet pile at the rightmost end abut against a second connecting plate. The fixing pipe between the second sheet pile and the first sheet pile at the rightmost end is inserted through the second connecting plate. The second connecting plate is detachably connected to the second sheet pile and the first sheet pile at the rightmost end.

[0010] Compared with existing technologies, this application improves the overall stability, impermeability and design strength of steel sheet piles by using a combination of fixed pipes and embedded steel sheet piles and grouting for seepage prevention. This expands the application scope of steel sheet piles in the field of foundation pit support. Furthermore, it is easy to install, simple to operate, causes less construction disturbance, and can be repeatedly recycled.

[0011] Preferably, the lower ends of the plurality of first sheet piles and second sheet piles are provided with conical embedding plates. The conical embedding plates are conical in shape. Two notches on the first sheet piles are provided through the conical embedding plates located at their lower ends. One side of the conical embedding plate at the lower end of the second sheet piles is flush with one side of the second sheet piles.

[0012] Furthermore, the tapered insert plate facilitates insertion into the base layer while ensuring precise splicing.

[0013] Preferably, a lifting eye bolt is installed at the upper middle part of both the first and second sheet piles. The upper ends of the first and second sheet piles at the rightmost end abut against a second connecting plate. The middle part of the first and second connecting plates are provided with an inner hole and four threaded holes. Both ends of the first connecting plate are provided with outer holes. The lifting eye bolt passes through the outer hole of the connecting plate. The inner hole of the connecting plate is located between the four threaded holes. A fixing pipe located between two adjacent first sheet piles passes through the connecting plate. On the hole, two threaded holes are opened on both sides of the upper end of the first steel sheet pile and the second steel sheet pile. The two threaded holes on the same side are set on one side of the slot. The four threaded holes on the same first connecting plate correspond to the four threaded holes at the upper end of the two first steel sheet piles that abut each other. The four threaded holes on the same second connecting plate correspond to the two threaded holes at the rightmost end and the two threaded holes at the end of the second steel sheet pile that abuts the first steel sheet pile. Connecting bolts are threaded through the four threaded holes of the connecting plate and are screwed into the threaded holes.

[0014] Furthermore, it facilitates the interlocking of components to complete the connection and fixation between them.

[0015] Preferably, the lifting eye bolt is disposed through the outer hole of the connecting plate.

[0016] Furthermore, it ensures that the eye bolts are exposed, allowing for good connection and fixation with corresponding external components.

[0017] Preferably, the fixing tube has multiple circular through holes spaced equidistantly from bottom to top along the tube body, and the upper end of the fixing tube is provided with a perforated rubber plug, which is connected to the fixing tube by a thread.

[0018] Furthermore, it facilitates the flow of poured concrete.

[0019] Preferably, the diameter of the fixing tube is the same as the diameter of the slot.

[0020] Furthermore, it can fit precisely, making it easy to connect and fix.

[0021] Preferably, the inner diameter of the connecting plate is the same as the diameter of the fixed pipe; the outer diameter of the connecting plate is the same as the diameter of the lifting eye bolt; and the diameter of the threaded hole of the connecting plate is the same as the diameter of the threaded hole.

[0022] Furthermore, it facilitates the interlocking of components.

[0023] Preferably, the first sheet pile, the second sheet pile, the fixing pipe, the first connecting plate, and the second connecting plate are all steel products, and the perforated rubber plug is a rubber product.

[0024] Furthermore, it can help extend the lifespan of components.

[0025] This invention also proposes a construction method for a novel steel sheet pile support system for foundation pit engineering, comprising the following steps:

[0026] Step 1: Hoisting the steel sheet pile; Secure the lifting eye bolts to the upper end of the steel sheet pile using threads. After connecting the lifting eye bolts to the crane, lift the steel sheet pile and move it to the designated construction position;

[0027] Step 2: Dynamic compaction of sheet piles; The conical embedded plate of the sheet pile is in vertical contact with the ground. Using existing piling equipment, the sheet pile is vibrated and compacted to the specified depth.

[0028] Step 3: Lower the fixing pipe; Pass the steel cable through the uppermost through hole of the fixing pipe and lift it with a crane, then lower it at the reserved position between the steel sheet piles so that the lower end of the fixing pipe is embedded in the groove of the steel sheet pile.

[0029] Step 4: Fixing the connecting plate; Remove the eye bolts, insert the inner hole of the connecting plate into the upper part of the fixing tube, and use eye bolts and ordinary bolts to pass through the outer hole and threaded hole of the connecting plate respectively to fix the connecting plate to the steel sheet pile;

[0030] Step 5: Grouting; Install the perforated rubber plug onto the upper end of the fixed pipe, and use a grouting machine to inject cement mortar into the fixed pipe through the through hole of the rubber plug until the top of the pipe is reached. After grouting is completed, remove the perforated rubber plug.

[0031] Step 6: Recycling; After the project is completed, first remove the connecting plate, then pull out the fixing pipe and the sheet pile respectively. The sheet pile and the fixing plate can be reused.

[0032] The beneficial effects of this invention are:

[0033] 1. This invention improves the overall stability, impermeability, and design strength of steel sheet piles by combining fixed pipes and steel sheet piles with grouting for seepage prevention, thereby expanding the application scope of steel sheet piles in the field of foundation pit support.

[0034] 2. This invention allows for the design of different steel sheet pile cross-sections based on the foundation pit conditions. It is easy to install, simple to operate, causes minimal construction disturbance, and can be repeatedly recycled. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the first steel sheet pile structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the second steel sheet pile structure of the present invention;

[0038] Figure 4This is a schematic diagram of the fixed tube structure of the present invention;

[0039] Figure 5 This is a schematic diagram of the first connecting plate structure of the present invention;

[0040] Figure 6 This is a schematic diagram of the second connecting plate structure of the present invention;

[0041] In the figure: 1 First sheet pile, 101 Lifting eye bolt, 102 Slot, 103 Conical embedded plate, 2 Second sheet pile, 3 Fixing pipe, 301 Perforated rubber plug, 302 Circular through hole, 4 First connecting plate, 401 Inner hole of connecting plate, 402 Outer hole of connecting plate, 403 Threaded hole of connecting plate, 5 Second connecting plate. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0043] Reference Figure 1-6 A sheet pile support structure for foundation pit engineering includes multiple first sheet piles 1, second sheet piles 2, multiple fixing pipes 3, multiple first connecting plates 4, and second connecting plates 5 arranged sequentially. The first sheet piles 1, second sheet piles 2, fixing pipes 3, first connecting plates 4, and second connecting plates 5 are all made of steel, which effectively improves product performance and extends service life. The multiple first sheet piles 1 are arranged sequentially from left to right, with adjacent first sheet piles 1 abutting each other for easy splicing. The second sheet piles 2 abut against the rightmost first sheet pile 1 for easy right-angle splicing. The second sheet piles 2 and the abutting first sheet piles 1 are arranged perpendicularly. The multiple fixing pipes 3 are respectively arranged between adjacent first sheet piles 1. A first connecting plate 4 is provided through the fixing pipe 3 between the second sheet pile 2 and the rightmost first sheet pile 1, and a second connecting plate 5 is provided through the fixing pipe 3 between the second sheet pile 2 and the rightmost first sheet pile 1. The first connecting plate 4 and the second connecting plate 5 can further ensure the firmness of the connection. In use, the first sheet pile 1 and the second sheet pile 2 can be spliced ​​on the vertical end of the base layer, and can be accurately fitted. At the same time, the first sheet pile 1 and the second sheet pile 2 can achieve right-angle turning, which can adapt well to the shape of the base layer and facilitate better fitting. In actual production, the corresponding specifications can be produced as needed to facilitate better assembly and connection.

[0044] Reference Figure 1-6The first sheet pile 1 has notches at both ends and the second sheet pile 2 has notches at one end, which can be connected to external hoisting equipment for easy hoisting and insertion into the foundation pit. The two notches on the same first sheet pile 1 are staggered. The thickness of the second sheet pile 2 is the same as the width of the notch, which facilitates splicing and right-angle turning. The middle of one side wall of the notch and the middle of the end of the second sheet pile 2 without a notch are provided with slots 102. The fixing pipe 3 is inserted between two adjacent slots 102. The diameter of the fixing pipe 3 is the same as the diameter of the slot 102, which can complete the connection. The upper ends of two adjacent first sheet piles 1 abut against the first A connecting plate 4 and a fixing pipe 3 are installed through the first connecting plate 4. The first connecting plate 4 and the two first sheet piles 1 that abut against it are detachably connected. The second sheet pile 2 and the first sheet pile 1 located at the rightmost end abut against the second connecting plate 5. The fixing pipe 3 located between the second sheet pile 2 and the first sheet pile 1 located at the rightmost end is installed through the second connecting plate 5. The second connecting plate 5 is detachably connected to the second sheet pile 2 and the first sheet pile 1 located at the rightmost end. The detachable connection facilitates the splicing of components and allows for easy installation and disassembly as needed, so as to fully adapt to the shape of the foundation pit and better carry out support operations.

[0045] Reference Figure 1-3 Each of the first sheet piles 1 and the second sheet piles 2 has a tapered embedded plate 103 at its lower end. The tapered embedded plate 103 is tapered. Two notches on the first sheet pile 1 are inserted through the tapered embedded plate 103 at its lower end. One side of the tapered embedded plate 103 at the lower end of the second sheet pile 2 is flush with one side of the second sheet pile 2. By opening the corresponding notches and inserting them through the first sheet piles 1 and the second sheet piles 2, the splicing effect and the firmness of the connection can be well guaranteed.

[0046] Reference Figure 1-3The upper middle part of the first sheet pile 1 and the second sheet pile 2 are both equipped with lifting eye bolts 101, which can be well connected to the hoisting equipment to facilitate the transfer of the sheet piles. The upper ends of the first sheet pile 1 and the second sheet pile 2 at the rightmost end abut against the second connecting plate 5. The middle part of the first connecting plate 4 and the second connecting plate 5 are provided with connecting plate inner holes 401 and four connecting plate threaded holes 403. Both ends of the first connecting plate 4 are provided with connecting plate outer holes 402. The lifting eye bolts 101 are inserted through the connecting plate outer holes 402. The connecting plate inner holes 401 are located between the four connecting plate threaded holes 403. The fixing pipe 3 is located between two adjacent first sheet piles 1. Two threaded holes are provided on both sides of the upper end of the first sheet pile 1 and the second sheet pile 2, and the two threaded holes on the same side are located on one side of the slot 102. The four threaded holes 403 on the same first connecting plate 4 correspond to the four threaded holes at the upper end of the two first sheet piles 1 that are in contact with each other. The four threaded holes 403 on the same second connecting plate 5 correspond to the two threaded holes at the rightmost end and the two threaded holes at the end of the second sheet pile 2 that is in contact with the first sheet pile 1. Connecting bolts are provided through the four threaded holes 403. The connecting bolts are screwed into the threaded holes. The connecting bolts can be screwed into the threaded holes 403 of the connecting plate and into the corresponding threaded holes.

[0047] Reference Figure 1 , 4 The fixed pipe 3 has multiple circular through holes 302 arranged at equal intervals from bottom to top along the pipe body. The upper end of the fixed pipe 3 is provided with a perforated rubber plug 301. The perforated rubber plug 301 and the fixed pipe 3 are connected by threads. The perforated rubber plug 301 is a rubber product. Concrete can be poured through the holes on the perforated rubber plug 301 to facilitate its entry into the fixed pipe 3. At the same time, the concrete can overflow through the circular through holes 302 for filling operations. After solidification, it can further ensure the firmness of the connection.

[0048] Reference Figure 1 , 4 5, 6, The diameter of the inner hole 401 of the connecting plate is the same as the diameter of the fixed pipe 3; the diameter of the outer hole 402 of the connecting plate is the same as the diameter of the lifting eye bolt 101; the diameter of the threaded hole 403 of the connecting plate is the same as the diameter of the threaded hole, which can better ensure the installation and fixation of the connecting bolts and the fixed pipe.

[0049] This invention also proposes a construction method for a novel steel sheet pile support system for foundation pit engineering, comprising the following steps:

[0050] Step 1: Hoisting the steel sheet pile; Secure the lifting eye bolts to the upper end of the steel sheet pile using threads. After connecting the lifting eye bolts to the crane, lift the steel sheet pile and move it to the designated construction position;

[0051] Step 2: Dynamic compaction of sheet piles; The conical embedded plate of the sheet pile is in vertical contact with the ground. Using existing piling equipment, the sheet pile is vibrated and compacted to the specified depth.

[0052] Step 3: Lower the fixing pipe; Pass the steel cable through the uppermost through hole of the fixing pipe and lift it with a crane, then lower it at the reserved position between the steel sheet piles so that the lower end of the fixing pipe is embedded in the groove of the steel sheet pile.

[0053] Step 4: Fixing the connecting plate; Remove the eye bolts, insert the inner hole of the connecting plate into the upper part of the fixing tube, and use eye bolts and ordinary bolts to pass through the outer hole and threaded hole of the connecting plate respectively to fix the connecting plate to the steel sheet pile;

[0054] Step 5: Grouting; Install the perforated rubber plug onto the upper end of the fixed pipe, and use a grouting machine to inject cement mortar into the fixed pipe through the through hole of the rubber plug until the top of the pipe is reached. After grouting is completed, remove the perforated rubber plug.

[0055] Step 6: Recycling; After the project is completed, first remove the connecting plate, then pull out the fixing pipe and the sheet pile respectively. The sheet pile and the fixing plate can be reused.

[0056] In this invention, a steel sheet pile support structure for foundation pit engineering includes a first steel sheet pile 1, a second steel sheet pile 2, a fixing pipe 3, a first connecting plate 4, and a second connecting plate 5; the first steel sheet piles 1 are connected to the first connecting plate 4 through the fixing pipe 3; the first steel sheet piles 1 and the second steel sheet piles 2 are connected to the second connecting plate 5 through the fixing pipe 3.

[0057] Both the first sheet pile 1 and the second sheet pile 2 include a lifting eye bolt 101, a slot 102 and a conical embedded plate 103. The sheet pile has a hollow internal design. The conical embedded plate 103 at the lower end is designed to facilitate the insertion of the sheet pile into the soil and reduce resistance.

[0058] The fixed pipe 3 is provided with circular through holes 302 at equal intervals along the pipe body, so that cement mortar can seep into the joint of the steel sheet pile through the fixed pipe to achieve the purpose of seepage prevention; the fixed pipe 3 is provided with a perforated rubber plug 301 at the top, and the perforated rubber plug 301 is connected to the fixed pipe 3 by threads, which can prevent the grout from rising and bubbling during the grouting process; the perforated rubber plug 301 is provided with through holes as grouting channels;

[0059] The wall of the fixing pipe 3 has the same size as the pre-reserved gap in the slot 102 of the steel sheet pile. The fixing pipe 3 can be embedded in the slot 102 of the steel sheet pile for fixed connection of the lower ends of two adjacent steel sheet piles.

[0060] The upper end of the sheet pile is fixedly connected by a connecting plate. The inner diameter of the connecting plate is the same as the outer diameter of the fixing pipe 3. The outer diameter of the connecting plate is the same as the outer diameter of the lifting eye bolt 101. The threaded hole of the connecting plate is the same as the threaded hole at the upper end of the sheet pile. The fixing plate 3 can restrict the relative movement between sheet piles and between the sheet pile and the fixing pipe 3.

[0061] The first sheet pile 1 is a conventional sheet pile, which can be used at the edge and corner of the foundation pit. To facilitate the handling of the corner of the foundation pit, the second sheet pile 2 is specially used at the corner of the foundation pit. The first connecting plate 4 is used to connect and fix the first sheet piles 1, and the second connecting plate 5 is used to connect and fix the first sheet piles 1 and the second sheet piles 2. It should be noted that the first sheet piles 1 and the second sheet piles 2 only differ in cross-section, and their internal structures are the same. The first connecting plate 4 and the second connecting plate 5 have different shapes, but both serve to fix and connect.

[0062] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sheet pile support structure for foundation pit engineering, comprising a plurality of first sheet piles (1), second sheet piles (2), a plurality of fixing pipes (3), a plurality of first connecting plates (4), and second connecting plates (5) arranged sequentially, characterized in that: Multiple first sheet piles (1) are arranged sequentially from left to right. Two adjacent first sheet piles (1) abut against each other. The second sheet pile (2) abuts against the rightmost first sheet pile (1). The second sheet pile (2) and the first sheet pile (1) it abuts against are set perpendicularly. Multiple fixing pipes (3) are respectively set between two adjacent first sheet piles (1) and between the second sheet pile (2) and the rightmost first sheet pile (1). A first connecting plate (4) is provided through the fixing pipe (3) between two adjacent first sheet piles (1). A second connecting plate (5) is provided through the fixing pipe (3) between the second sheet pile (2) and the rightmost first sheet pile (1). The first sheet pile (1) has notches at both ends and the second sheet pile (2) has notches at one end. The two notches on the same first sheet pile (1) are staggered. The thickness of the second sheet pile (2) is the same as the width of the notch. The middle of the side wall of one end of the notch and the middle of the end of the second sheet pile (2) without a notch are provided with slots (102). The fixing pipe (3) is installed through the two adjacent slots (102). The upper ends of the two adjacent first sheet piles (1) abut against the first connecting plate (4). 3) The first connecting plate (4) is detachably connected to the first connecting plate (4) and the two first sheet piles (1) that abut against it. The second sheet pile (2) and the first sheet pile (1) located at the rightmost end abut against the second connecting plate (5). The fixing pipe (3) located between the second sheet pile (2) and the first sheet pile (1) located at the rightmost end is detachably connected to the second connecting plate (5).

2. The steel sheet pile support structure for foundation pit engineering according to claim 1, characterized in that: Multiple first sheet piles (1) and second sheet piles (2) are provided with tapered embedded plates (103) at their lower ends. The tapered embedded plates (103) are tapered. Two notches on the first sheet piles (1) are provided through the tapered embedded plates (103) located at their lower ends. One side of the tapered embedded plates (103) at the lower end of the second sheet piles (2) is flush with one side of the second sheet piles (2).

3. The steel sheet pile support structure for foundation pit engineering according to claim 1, characterized in that: The upper middle part of the first sheet pile (1) and the second sheet pile (2) are both equipped with eye bolts (101). The upper ends of the first sheet pile (1) and the second sheet pile (2) at the rightmost end are in contact with a second connecting plate (5). The middle part of the first connecting plate (4) and the second connecting plate (5) are provided with an inner hole (401) and four threaded holes (403). The two ends of the first connecting plate (4) are provided with outer holes (402). The eye bolts (101) are installed through the outer holes (402) of the connecting plate. The inner holes (401) of the connecting plate are located between the four threaded holes (403). The fixing pipe (3) located between two adjacent first sheet piles (1) is provided with a second connecting plate (5). The first sheet pile (1) and the second sheet pile (2) are provided with two threaded holes on both sides of the upper end. The two threaded holes on the same side are provided on one side of the slot (102). The four threaded holes (403) on the same first connecting plate (4) correspond to the four threaded holes at the upper end of the two first sheet piles (1) respectively. The four threaded holes (403) on the same second connecting plate (5) correspond to the two threaded holes at the rightmost end and the two threaded holes at the end of the second sheet pile (2) and the first sheet pile (1) that are in contact respectively. The four threaded holes (403) are provided with connecting bolts, which are screwed into the threaded holes.

4. The steel sheet pile support structure for foundation pit engineering according to claim 1, characterized in that: The fixed tube (3) has multiple circular through holes (302) arranged at equal intervals from bottom to top along the tube body. The upper end of the fixed tube (3) is provided with a perforated rubber plug (301). The perforated rubber plug (301) and the fixed tube (3) are connected by threads.

5. A steel sheet pile support structure for foundation pit engineering according to claim 1, characterized in that: The diameter of the fixing tube (3) is the same as the diameter of the slot (102).

6. The steel sheet pile support structure for foundation pit engineering according to claim 3, characterized in that: The diameter of the inner hole (401) of the connecting plate is the same as the diameter of the fixed tube (3); the diameter of the outer hole (402) of the connecting plate is the same as the diameter of the eye bolt (101); the diameter of the threaded hole (403) of the connecting plate is the same as the diameter of the threaded hole.

7. A steel sheet pile support structure for foundation pit engineering according to claim 4, characterized in that: The first sheet pile (1), the second sheet pile (2), the fixing pipe (3), the first connecting plate (4) and the second connecting plate (5) are all steel products, and the perforated rubber plug (301) is a rubber product.

8. A construction method for steel sheet pile support in foundation pit engineering, characterized in that, The foundation pit engineering steel sheet pile support structure according to any one of claims 1-7 further includes the following steps: Step 1: Hoisting the steel sheet pile; Secure the lifting eye bolts to the upper end of the steel sheet pile using threads. After connecting the lifting eye bolts to the crane, lift the steel sheet pile and move it to the designated construction position; Step 2: Dynamic compaction of sheet piles; The conical embedded plate of the sheet pile is in vertical contact with the ground. Using existing piling equipment, the sheet pile is vibrated and compacted to the specified depth. Step 3: Lower the fixing pipe; Pass the steel cable through the uppermost through hole of the fixing pipe and lift it with a crane, then lower it at the reserved position between the steel sheet piles so that the lower end of the fixing pipe is embedded in the groove of the steel sheet pile. Step 4: Fixing the connecting plate; Remove the eye bolts, insert the inner hole of the connecting plate into the upper part of the fixing tube, and use eye bolts and ordinary bolts to pass through the outer hole and threaded hole of the connecting plate respectively to fix the connecting plate to the steel sheet pile; Step 5: Grouting; Install the perforated rubber plug onto the upper end of the fixed pipe, and use a grouting machine to inject cement mortar into the fixed pipe through the through hole of the rubber plug until the top of the pipe is reached. After grouting is completed, remove the perforated rubber plug. Step 6: Recycling; After the project is completed, first remove the connecting plate, then pull out the fixing pipe and the sheet pile respectively. The sheet pile and the fixing pipe can be reused.

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