Construction method for Larsen steel sheet piles in river channel

Abstract

The invention discloses a construction method of Larsen steel sheet piles in a river channel, which comprises the following steps: driving a first Larsen steel sheet pile from the center of one side of a cofferdam, then gradually inserting and driving towards two sides, and finally closing at the center of the short side of the downstream of the river; during closure, when the reserved distance L1 between the two Larsen steel sheet piles at the closure position is just equal to the width L2 of the last Larsen steel sheet pile, the last Larsen steel sheet pile is directly inserted and driven; if L2lt; l1lt; when L2gt is equal to 2L2, a longitudinal fracture is cut in the web of the last Larsen steel sheet pile, and when L2gt is equal to 2L2, L2gt is equal to 2L2; when L1 is larger than L1, a section of longitudinal fracture is cut in the web of the last Larsen steel sheet pile, then the longitudinal fracture and the connecting piece are manufactured into special-shaped steel sheet piles, then the special-shaped steel sheet piles are inserted and driven, and the two Larsen steel sheet piles at the closure position are connected through connecting lock catches at the two ends of the special-shaped steel sheet piles. The size of the special-shaped steel sheet pile used for closure can be adjusted according to the reserved distance between the two Larsen steel sheet piles at the closure position, so that the applicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal highway engineering. More specifically, the present invention relates to a construction method for L-shaped steel sheet piles in a river channel. Background Art

[0002] In the construction of an L-shaped steel sheet pile cofferdam, the closure of the cofferdam is the key and also the difficulty of the entire construction technology, which determines the ultimate success or failure of the entire L-shaped steel sheet pile cofferdam. When the reserved distance between two L-shaped steel sheet piles at the closure is exactly equal to the width of the last L-shaped steel sheet pile, the last L-shaped steel sheet pile can be directly inserted. When the difference between the reserved distance and the width of the last L-shaped steel sheet pile is large, the L-shaped steel sheet pile cofferdam cannot be smoothly closed, and special-shaped steel sheet piles need to be used for closure.

[0003] For the existing closure structure of an L-shaped steel sheet pile cofferdam, such as the special-shaped steel sheet pile disclosed in the application publication number CN 106638562 A, a steel sheet pile notch is vertically penetrated in the middle of the standard L-shaped steel sheet pile, so that the standard L-shaped steel sheet pile is divided into two separate steel sheets, and the width of the notch between the two separate steel sheets can be telescopic; a steel pipe notch is vertically penetrated on the pipe wall of the steel pipe, so that the steel pipe forms a vertical opening on the side wall; the steel pipe notch and the steel sheet pile notch are welded on both sides, and the steel pipe is used to form a connection between the two separate steel sheets in the standard L-shaped steel sheet pile to achieve side water stop. However, this special-shaped steel sheet pile is welded by a standard L-shaped steel sheet pile and a steel pipe, with fixed structure and dimensions, poor applicability, and cannot be reused. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction method for L-shaped steel sheet piles in a river channel. The special-shaped steel sheet piles used for closure can adjust the dimensions according to the reserved distance between the two L-shaped steel sheet piles at the closure, so as to have strong applicability and can be reused.

[0005] To achieve these and other advantages of the present invention, a construction method for L-shaped steel sheet piles in a river channel is provided, including: Driving the first L-shaped steel sheet pile from the center on one side of the cofferdam, and then gradually inserting it towards both sides, and finally closing at the center of the short side downstream of the river; when closing, when the reserved distance L1 between the two L-shaped steel sheet piles at the closure is exactly equal to the width L2 of the last L-shaped steel sheet pile, directly insert the last L-shaped steel sheet pile; when L2 < L1 < 2L2, cut a longitudinal break on the web of the last L-shaped steel sheet pile, when L2 > L1, cut a section of longitudinal break on the web of the last L-shaped steel sheet pile, and then make it into a special-shaped steel sheet pile together with the connecting piece, and then insert the special-shaped steel sheet pile, and connect the two L-shaped steel sheet piles at the closure through the connecting locks at both ends of the special-shaped steel sheet pile; Among them, the structure of the special-shaped steel sheet pile includes: The Larsen steel sheet pile body has two sections of webs formed by cutting one or one section of longitudinal fracture on its web; A connecting member, comprising a first connecting plate, a second connecting plate, at least one telescopic member and a movable plate, wherein the second connecting plate is formed integrally and is composed of a first part, a second part and a third part sequentially arranged in a transverse direction, wherein the first part, the second part and the third part are parallel to the two sections of the webs, one end of each telescopic member is fixedly connected to the second part, and each telescopic member is telescoped by moving its other end; the movable plate is parallel to the two sections of the webs, fits with the third part, and is fixedly connected to the other end of each telescopic member; the first connecting plate is slidably connected to the second part, and can slide between a first position and a second position in a transverse direction; when the first connecting plate is in the first position, the first connecting plate fits with one side of the two sections of the webs and the second part, and each telescopic member is located between the first connecting plate and the third part, one section of the two webs is clamped between the first part and the first connecting plate, and is against the second part, and the other section of the web is clamped between the movable plate and the first connecting plate, and is against the other end of each telescopic member; when the first connecting plate is in the second position, the first connecting plate is not opposite to the third part; A top plate, which is detachably connected to the tops of the first connecting plate and the second connecting plate; A bottom plate is slidably connected to the bottom of the first connecting plate; when the first connecting plate slides between the first position and the second position, the first connecting plate slides relative to the bottom plate; the bottom plate is connected to the bottom of the second connecting plate, and the two webs are sandwiched between the top plate and the bottom plate; The method for making special-shaped steel sheet piles includes: placing the first connecting plate in the second position, then adjusting the length of the telescopic member according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic member and the second part in the transverse direction is L3, then moving the first connecting plate to the first position laterally, then clamping one of the two webs between the first part and the first connecting plate, and abutting against the second part, and located on the bottom plate, the other web is clamped between the moving plate and the first connecting plate, and abutting against the other end of each telescopic member, and located on the bottom plate, and finally connecting the top plate to the top of the first connecting plate and the second connecting plate.

[0006] Preferably, in the method for constructing Larsen steel sheet piles in a river channel, the telescopic member is a telescopic plate, there are multiple telescopic members, and the multiple telescopic members are arranged in sequence along the longitudinal direction of the web.

[0007] Preferably, in the method for constructing Larsen steel sheet piles in a river channel, the tops of the first connecting plate, the second connecting plate, the movable plate and the two webs are respectively fitted with the top plate, and the bottoms are respectively fitted with the bottom plate.

[0008] Preferably, in the Larsen steel sheet pile construction method in the river channel, at least one slide groove is provided on the inner side of the third part, each slide groove extends along the lateral direction of the web, and a plurality of sliders are provided on the movable plate, one slider corresponds to one slide groove, and each slider can slide along the slide groove corresponding thereto.

[0009] Preferably, in the Larsen steel sheet pile construction method in the river channel, the first connecting plate, the first part, the second part, the third part and the movable plate are all in the shape of a cuboid.

[0010] Preferably, in the method for constructing Larsen steel sheet piles in a river channel, two ends of the first connecting plate along the transverse direction are respectively aligned with two ends of the second connecting plate along the transverse direction.

[0011] Preferably, in the Larsen steel sheet pile construction method in the river channel, at least one first T-block is provided in the middle of the second part, a first T-slot is provided on the first connecting plate in the transverse direction, each first T-block is located in the first T-slot and cooperates with the first T-slot, so that the first connecting plate can slide between a first position and a second position in the transverse direction, at least one second T-block is provided on the bottom plate, a second T-slot is provided on the bottom of the first connecting plate in the transverse direction, each second T-block is located in the second T-slot and cooperates with the second T-slot, so that the first connecting plate can slide in the transverse direction relative to the bottom plate.

[0012] Preferably, in the method for constructing Larsen steel sheet piles in a river channel, one section of the two webs is detachably connected to the first portion, and the other section of the web is detachably connected to the movable plate; Methods for making special-shaped steel sheet piles include: One of the two webs is connected to the first portion and abuts against the second portion and is located on the bottom plate; The first connecting plate is placed in the second position, so that the other web of the two webs is connected to the movable plate, butted against the other end of each telescopic member, and located on the bottom plate; According to the distance L3 between the two webs, the length of the telescopic member is adjusted so that the length of the entirety of the telescopic member and the second portion in the transverse direction is L3, then the first connecting plate is moved transversely to the first position, and finally the top plate is connected to the tops of the first connecting plate and the second connecting plate; or, One of the two webs is connected to the first portion and abuts against the second portion and is located on the bottom plate; Put the first connecting plate in the second position, adjust the length of the telescopic part according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic part and the second part along the lateral direction is L3, then connect the other web of the two webs to the movable plate, and abut against the other end of each telescopic part, and be located on the bottom plate, then move the first connecting plate laterally to the first position, and finally connect the top plate to the top of the first connecting plate and the second connecting plate.

[0013] The present invention has at least the following beneficial effects: The special-shaped steel sheet piles used for the joint closure of the present invention can be adjusted in size according to the reserved spacing between two Larsen steel sheet piles at the joint closure, so that the special-shaped steel sheet piles have strong applicability and can be used repeatedly.

[0014] When making special-shaped steel sheet piles, the present invention makes the first connecting plate in the second position, then adjusts the length of the telescopic member according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic member and the second part in the transverse direction is L3, then moves the first connecting plate to the first position transversely, then clamps one of the two webs between the first part and the first connecting plate, and abuts against the second part, and is located on the bottom plate, and the other web is clamped between the moving plate and the first connecting plate, and abuts against the other end of each telescopic member, and is located on the bottom plate, and finally connects the top plate to the top of the first connecting plate and the second connecting plate. The manufacturing process is simple and easy to operate.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure after the construction of Larsen steel sheet piles in a river channel according to an embodiment of the present invention; Figure 2 is a structural schematic diagram of a fracture according to an embodiment of the present invention; Figure 3 1 is a top view of a special-shaped steel sheet pile according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0018] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0019] As Figures 1 to 3 shown, the present invention provides a construction method for L-shaped steel sheet piles in a river channel, including: As Figure 1 shown, start driving the first L-shaped steel sheet pile from the center on one side of the cofferdam, and then gradually drive and insert it on both sides, and finally close the gap at the center of the short side downstream of the river; when closing the gap, when the reserved distance (the distance between two connecting locking buckles 103) L1 between the two L-shaped steel sheet piles at the closing position is exactly equal to the width L2 of the last L-shaped steel sheet pile (standard L-shaped steel sheet pile), directly drive and insert the last L-shaped steel sheet pile, which is the most ideal situation; when L2 < L1 < 2L2, the reserved distance between the two L-shaped steel sheet piles at the closing position is relatively large, and is greater than the width of one standard L-shaped steel sheet pile and less than the width of two standard L-shaped steel sheet piles. At this time, cut a longitudinal fracture 101 on the web 102 of the last L-shaped steel sheet pile, that is, only cut the web 102 of the last L-shaped steel sheet pile longitudinally to form two sections of web 102. After cutting, move the two sections of web 102 away from each other to increase the distance between the two sections of web 102, so as to increase the width of the last L-shaped steel sheet pile. When L2 > L1, the reserved distance between the two L-shaped steel sheet piles at the closing position is relatively small, and is less than the width of one standard L-shaped steel sheet pile. At this time, cut a longitudinal fracture 101 with a certain width on the web 102 of the last L-shaped steel sheet pile, that is, cut a section of the web 102 of the last L-shaped steel sheet pile longitudinally to form two sections of web 102. After cutting a section, move the two sections of web 102 towards each other to reduce the distance between the two sections of web 102, so as to reduce the width of the last L-shaped steel sheet pile. Then, according to the distance L3 between the two sections of web 102, adjust the size of the connecting piece, and then make a special-shaped steel sheet pile together with the connecting piece, and then drive and insert the special-shaped steel sheet pile, and connect the two L-shaped steel sheet piles at the closing position through the connecting locking buckles 103 at both ends of the special-shaped steel sheet pile. The structure of the connecting locking buckles 103 at both ends of the special-shaped steel sheet pile and the connection method with the two L-shaped steel sheet piles at the closing position remain unchanged, and only adjust the size of the connecting piece through the distance between the two sections of web 102 to obtain a special-shaped steel sheet pile; Among them, the structure of the special-shaped steel sheet pile includes: The L-shaped steel sheet pile body 1, that is, the standard L-shaped steel sheet pile, after cutting a longitudinal fracture 101 on its web 102, forms two sections of web 102, as Figure 2 As shown; The connecting member is used to seal the longitudinal fracture 101 and connect the two webs 102. The connecting member includes a first connecting plate 21, a second connecting plate 22, at least one telescopic member 23 and a movable plate 24. The second connecting plate 22 is integrally formed and is arranged in a transverse direction (such as Figure 3 The first part 221, the second part 222 and the third part 223 are all parallel to the two sections of the web 102, one end of each telescopic member 23 is fixedly connected to the second part 222, the first connecting plate is slidably connected to the second part, and can slide between the first position and the second position in the transverse direction; when the first connecting plate is in the first position, the first connecting plate is in contact with the two sections of the web and one side of the second part, each telescopic member is located between the first connecting plate and the third part, one section of the two webs is stuck between the first part and the first connecting plate, and is against the second part, and the other section of the web is stuck between the movable plate and the first connecting plate, and is against the other end of each telescopic member; when the first connecting plate is in the second position, the first connecting plate and the third part are not opposite; Figure 3 As shown, at this time, the first connecting plate is in the first position, and the first connecting plate can be moved to the left to be in the second position.

[0020] A top plate 3, which is detachably connected to the tops of the first connecting plate and the second connecting plate; Figure 3 In the figure, the top plate 3 is indicated by a dotted line. In actual use, the top plate 3, the first connecting plate 21, and the second connecting plate 22 may be formed of the same size as each other. The top plate 3 and the tops of the first connecting plate 21 and the second connecting plate 22 may be detachably connected. The tops of the first connecting plate 21 and the second connecting plate 22 are further connected together through the top plate 3. After the connection, the first connecting plate 21 cannot slide in the lateral direction. The bottom plate is slidably connected to the bottom of the first connecting plate; when the first connecting plate slides between the first position and the second position, the first connecting plate slides relative to the bottom plate, the bottom plate is connected to the bottom of the second connecting plate, and the two webs are sandwiched between the top plate and the bottom plate; the bottom plate and the first connecting plate 21 and the second connecting plate 22 are formed to form a rectangular parallelepiped with the same size; The method for making special-shaped steel sheet piles includes: placing the first connecting plate in the second position, and then adjusting the length of the telescopic member according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic member and the second part in the transverse direction is L3, and then moving the first connecting plate to the first position laterally, and then clamping one of the two webs between the first part and the first connecting plate, and abutting against the second part, and located on the bottom plate, and the other web is clamped between the moving plate and the first connecting plate, and abutting against the other end of each telescopic member, and located on the bottom plate, and finally connecting the top plate to the top of the first connecting plate and the second connecting plate. After the connection, the first connecting plate cannot move relative to the bottom plate. When used next time, the top plate is removed, and the first connecting plate can be moved to the second position relative to the bottom plate, and then the length of the telescopic member is adjusted according to the distance L3 between the two webs.

[0021] The special-shaped steel sheet piles used for the joint closure of the present invention can be adjusted in size according to the reserved spacing between two Larsen steel sheet piles at the joint closure, so that the special-shaped steel sheet piles have strong applicability and can be used repeatedly.

[0022] When making special-shaped steel sheet piles, the present invention makes the first connecting plate in the second position, then adjusts the length of the telescopic member according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic member and the second part in the transverse direction is L3, then moves the first connecting plate to the first position transversely, then clamps one of the two webs between the first part and the first connecting plate, and abuts against the second part, and is located on the bottom plate, and the other web is clamped between the moving plate and the first connecting plate, and abuts against the other end of each telescopic member, and is located on the bottom plate, and finally connects the top plate to the top of the first connecting plate and the second connecting plate. The manufacturing process is simple and easy to operate.

[0023] In another embodiment, in the method for constructing Larsen steel sheet piles in a river channel, the telescopic member 23 is a telescopic plate, and there are multiple telescopic members 23, and the multiple telescopic members 23 are arranged in sequence along the longitudinal direction of the web 102. The telescopic plate can be composed of a first plate body and a second plate body, one end of the first plate body is fixedly connected to the second part, the interior of the first plate body is hollow, one end of the second plate body is inserted into the first plate body, and the other end is fixedly connected to the movable plate, at least one threaded hole can be set on the side wall of the first plate body, and the first plate body and the second plate body are fixed together by correspondingly set bolts. After fixing, the bolt is inserted into the threaded hole of the first plate body and abuts against the side wall of the second plate body. When the first connecting plate is in the first position, the bolt is opposite to the first connecting plate, that is, the bolt and the threaded hole are located on the side where the first connecting plate is located, so that when the first connecting plate is in the second position, it is convenient to loosen or tighten the bolt.

[0024] In another embodiment, in the Larsen steel sheet pile construction method in the river channel, the tops of the first connecting plate, the second connecting plate, the movable plate and the two webs are respectively fitted with the top plate, and the bottoms are respectively fitted with the bottom plate, so that the tops and bottoms of the first connecting plate, the second connecting plate, the movable plate and the two webs form a sealing structure with the top plate and the bottom plate respectively.

[0025] In another embodiment, in the Larsen steel sheet pile construction method in the river channel, at least one slide groove is arranged on the inner side of the third part 223, and each slide groove extends along the lateral direction of the web 102. A plurality of sliders are arranged on the movable plate 24, and one slider corresponds to one slide groove. Each slider can slide along the corresponding slide groove, and the movable plate 24 is guided by the sliders and the slide grooves during its movement.

[0026] In another embodiment, in the method for constructing Larsen steel sheet piles in a river channel, the first connecting plate 21, the first part 221, the second part 222, the third part 223 and the movable plate 24 are all in the shape of a cuboid.

[0027] In another embodiment, in the method for constructing Larsen steel sheet piles in a river channel, two ends of the first connecting plate 21 along the transverse direction are respectively aligned with two ends of the second connecting plate 22 along the transverse direction.

[0028] In another embodiment, in the method for constructing Larsen steel sheet piles in a river channel, at least one first T-shaped block 4 is provided in the middle of the second part, a first T-shaped groove is provided on the first connecting plate in the transverse direction, each first T-shaped block 4 is located in the first T-shaped groove and cooperates with the first T-shaped groove, so that the first connecting plate can slide between the first position and the second position in the transverse direction, and the first connecting plate cannot move up and down relative to the second part (the second connecting plate), at least one second T-shaped block is provided on the bottom plate, a second T-shaped groove is provided on the bottom of the first connecting plate in the transverse direction, each second T-shaped block is located in the second T-shaped groove and cooperates with the second T-shaped groove, so that the first connecting plate can slide in the transverse direction relative to the bottom plate, but cannot move up and down relative to the bottom plate.

[0029] In another embodiment, in the method for constructing Larsen steel sheet piles in a river channel, one section of the two webs is detachably connected to the first portion, and the other section of the web is detachably connected to the movable plate; that is, a section of the web stuck between the first portion and the first connecting plate is detachably connected to the first portion, and a section of the web stuck between the movable plate and the first connecting plate is detachably connected to the movable plate; Methods for making special-shaped steel sheet piles include: One of the two webs is connected to the first portion and abuts against the second portion and is located on the bottom plate; The first connecting plate is placed in the second position, so that the other web of the two webs is connected to the movable plate, butted against the other end of each telescopic member, and located on the bottom plate; According to the distance L3 between the two webs, the length of the telescopic member is adjusted so that the length of the entirety of the telescopic member and the second portion in the transverse direction is L3, then the first connecting plate is moved transversely to the first position, and finally the top plate is connected to the tops of the first connecting plate and the second connecting plate; or, One of the two webs is connected to the first portion and abuts against the second portion and is located on the bottom plate; Put the first connecting plate in the second position, adjust the length of the telescopic part according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic part and the second part along the lateral direction is L3, then connect the other web of the two webs to the movable plate, and abut against the other end of each telescopic part, and be located on the bottom plate, then move the first connecting plate laterally to the first position, and finally connect the top plate to the top of the first connecting plate and the second connecting plate.

[0030] When the special-shaped steel sheet pile is used again, the other of the two webs is already connected to the movable plate and is in a connected state. When adjusting the length of the telescopic member, the other of the two webs can be taken out first, and then connected to the movable plate after the length of the telescopic member is adjusted, or it can be left there.

[0031] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. The method for constructing Larsen steel sheet piles in a river channel is characterized by: Including: Start driving the first sheet pile of Larssen from the center on one side of the cofferdam, then gradually drive it in both directions, and finally close the joint at the center of the short side downstream of the river. When closing the joint, when the reserved spacing L1 between the two Larssen sheet piles at the joint is exactly equal to the width L2 of the last Larssen sheet pile, directly drive the last Larssen sheet pile. When L2 < L1 < 2L2, cut a longitudinal break on the web of the last Larssen sheet pile. When L2 > L1, cut a section of longitudinal break on the web of the last Larssen sheet pile, and then make a special-shaped sheet pile together with the connecting piece, and then drive the special-shaped sheet pile, and connect the two Larssen sheet piles at the joint through the connecting locks at both ends of the special-shaped sheet pile. Among them, the structure of the special-shaped sheet pile includes: The Larssen sheet pile body, after cutting a longitudinal break or a section of longitudinal break on its web, forms two sections of web. The connecting piece includes a first connecting plate, a second connecting plate, at least one telescopic member and a moving plate. The second connecting plate is integrally formed and consists of a first part, a second part and a third part arranged in sequence in the transverse direction. The first part, the second part and the third part are all parallel to the two sections of web. One end of each telescopic member is fixedly connected to the second part, and each telescopic member is telescoped by moving its other end. The moving plate is parallel to the two sections of web, is in contact with the third part, and is fixedly connected to the other end of each telescopic member. The first connecting plate is slidably connected to the second part and can slide between a first position and a second position in the transverse direction. When the first connecting plate is in the first position, the first connecting plate is in contact with both the two sections of web and one side of the second part. Each telescopic member is located between the first connecting plate and the third part. One of the two sections of web is stuck between the first part and the first connecting plate and abuts against the second part, and the other section of web is stuck between the moving plate and the first connecting plate and abuts against the other end of each telescopic member. When the first connecting plate is in the second position, the first connecting plate is not opposite to the third part. The top plate is detachably connected to the tops of the first connecting plate and the second connecting plate. The bottom plate is slidably connected to the bottom of the first connecting plate. When the first connecting plate slides between the first position and the second position, the first connecting plate slides relative to the bottom plate. The bottom plate is connected to the bottom of the second connecting plate, and the two sections of web are sandwiched between the top plate and the bottom plate. The method for making the special-shaped sheet pile includes: making the first connecting plate in the second position, then adjusting the length of the telescopic member according to the distance L3 between the two sections of web, so that the overall length of the telescopic member and the second part in the transverse direction is L3, then horizontally moving the first connecting plate to the first position, then sticking one of the two sections of web between the first part and the first connecting plate and abutting against the second part and located on the bottom plate, and sticking the other section of web between the moving plate and the first connecting plate and abutting against the other end of each telescopic member and located on the bottom plate, and finally connecting the top plate to the tops of the first connecting plate and the second connecting plate.

2. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 1, characterized in that: The telescopic member is a telescopic plate, there are multiple telescopic members, and the multiple telescopic members are arranged in sequence in the longitudinal direction of the web.

3. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 2, characterized in that: The tops of the first connecting plate, the second connecting plate, the movable plate and the two webs are respectively fitted with the top plate, and the bottoms are respectively fitted with the bottom plate.

4. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 1, characterized in that: At least one slide groove is arranged on the inner side of the third part, and each slide groove extends along the transverse direction of the web. A plurality of sliders are arranged on the movable plate, and one slider corresponds to one slide groove, and each slider can slide along the corresponding slide groove.

5. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 3, characterized in that: The first connecting plate, the first part, the second part, the third part and the moving plate are all in the shape of a cuboid.

6. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 1, characterized in that: Two ends of the first connecting plate along the transverse direction are respectively aligned with two ends of the second connecting plate along the transverse direction.

7. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 1, characterized in that: At least one first T-shaped block is provided in the middle of the second part, and a first T-shaped groove is provided on the first connecting plate in the transverse direction. Each first T-shaped block is located in the first T-shaped groove and cooperates with the first T-shaped groove, so that the first connecting plate can slide between a first position and a second position in the transverse direction. At least one second T-shaped block is provided on the bottom plate, and a second T-shaped groove is provided on the bottom of the first connecting plate in the transverse direction. Each second T-shaped block is located in the second T-shaped groove and cooperates with the second T-shaped groove, so that the first connecting plate can slide in the transverse direction relative to the bottom plate.

8. The method for constructing Larsen steel sheet piles in a river channel as claimed in claim 1, characterized in that: One section of the two webs is detachably connected to the first portion, and the other section of the web is detachably connected to the movable plate; Methods for making special-shaped steel sheet piles include: One of the two webs is connected to the first portion and abuts against the second portion and is located on the bottom plate; The first connecting plate is placed in the second position, so that the other web of the two webs is connected to the movable plate, butted against the other end of each telescopic member, and located on the bottom plate; According to the distance L3 between the two webs, the length of the telescopic member is adjusted so that the length of the entirety of the telescopic member and the second portion in the transverse direction is L3, then the first connecting plate is moved transversely to the first position, and finally the top plate is connected to the tops of the first connecting plate and the second connecting plate; or, One of the two webs is connected to the first portion and abuts against the second portion and is located on the bottom plate; Put the first connecting plate in the second position, adjust the length of the telescopic part according to the distance L3 between the two webs, so that the length of the whole formed by the telescopic part and the second part along the lateral direction is L3, then connect the other web of the two webs to the movable plate, and abut against the other end of each telescopic part, and be located on the bottom plate, then move the first connecting plate laterally to the first position, and finally connect the top plate to the top of the first connecting plate and the second connecting plate.

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