Waterproof joint structure of underground diaphragm wall and construction method

Abstract

The invention discloses an underground diaphragm wall waterproof joint structure and a construction method. The structure is arranged between a pre-cast diaphragm wall and a post-cast diaphragm wall, and comprises two wall edge connecting steel plates which are arranged in the depth direction of the diaphragm wall and have the same length as the depth of the diaphragm wall, and a transverse hook steel bar arranged between the inner side of the outer end of a reinforcement cage of the pre-cast diaphragm wall and a transverse hook steel bar in a reinforcement cage of the post-cast diaphragm wall, the two wall edge connecting steel plates are symmetrically distributed on the two sides of the wall center line. The forked connecting steel plate is arranged in the underground diaphragm wall connector and comprises a main connecting steel plate extending in the length direction of the wall center line and two branch connecting steel plates connected to the two ends of the main connecting steel plate, and one branch connecting steel plate is buckled with the two wall edge connecting steel plates through end positioning steel plates on the two sides. The combination of the wall edge connecting steel plate, the forked connecting steel plate and the waterproof assembly can prevent water outside the diaphragm wall from forming a leakage passage in the thickness direction in the wall body.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to an underground continuous wall waterproof joint structure and a construction method. Background Art

[0002] In underground engineering construction, foundation pit engineering is a complex and important project. In deep and large foundation pits, underground continuous walls are widely used as a mature and reliable retaining structure that can also serve as a water-stop curtain. At present, common forms of ground-connected wall joints include lock pipe joints, cross-shaped steel plate joints, I-beam joints, precast concrete joints, etc. However, the quality of these joints is often not guaranteed, such as: the mud skin at the joints is difficult to clean, the steel cage is difficult to hoist and position, and the joints of the successively cast wall widths are offset, resulting in not being in a straight line. These problems have appeared in a large number of engineering practices, so that water leakage at the ground-connected wall joints is common, and it is often necessary to take blocking measures at the leakage. Water leakage at the ground-connected wall joints will not only delay the construction progress, but also have an adverse effect on the integrity of the retaining wall, weakening the overall safety of the foundation pit.

[0003] Therefore, the leakage problem of the ground-to-wall joint must be taken seriously. Although the existing joint structure is simple and easy to construct, it lacks corresponding effective waterproof measures and the construction quality is difficult to guarantee. In recent years, some new joint structures or construction methods have been proposed, such as:

[0004] CN201821458682.0 discloses a flexible anti-seepage structure of a ground-connected wall, which uses a partition, a spring sleeve, a spring, an extrusion rod, etc. to form a complex deformable flexible joint, but the construction steps of the structure are cumbersome, the precision requirements are high, the time consumption is long, and the cost is also high;

[0005] CN201910669480.3 discloses a method for stopping water in underground continuous wall joints in high-water-rich coastal areas. Galvanized iron sheets are installed on the outside of I-beams and sandbags are filled on the outside of I-beams to prevent concrete from bypassing. Then, grouting reinforcement is performed with a preset steel flower pipe to reduce the vertical settlement of the underground continuous wall. Although this method has simple construction steps, the galvanized iron sheets are easily damaged in actual projects and cannot prevent concrete from bypassing.

[0006] CN202210938262.7 discloses an underground continuous wall joint anti-seepage structure, an underground continuous wall and a construction method. A rubber water stop strip and an extruded steel part are arranged on one side of the H-shaped steel, and micro-expansion waterproof concrete is poured so that the extruded steel part squeezes the rubber water stop strip, thereby preventing water from seeping at the joint. The structural form is relatively simple but the construction steps are cumbersome and the cost is high. In addition, it is impossible to ensure that the rubber water stop strip fits tightly with the extruded steel part and the H-shaped steel, and the anti-seepage effect remains to be discussed. Summary of the invention

[0007] In order to solve the water leakage problem of the joints of adjacent wall sections of the ground-connected wall in the above-mentioned background technology, the present invention proposes an underground continuous wall waterproof joint structure and construction method. The joint structure is relatively simple in structure, has a unique design for waterproofing, has high integrity, has a large joint rigidity, and is simple and quick to construct. The joint can effectively solve the water leakage problem of the ground-connected wall joint and can be widely promoted for use.

[0008] The technical solution adopted by the present invention is as follows:

[0009] An underground continuous wall waterproof joint structure is arranged between the first cast ground diaphragm wall and the second cast ground diaphragm wall, and includes a waterproof joint arranged along the depth direction of the ground diaphragm wall and having a length consistent with the depth of the ground diaphragm wall.

[0010] The two wall side connecting steel plates are arranged between the inner side of the outer end of the steel cage of the first cast ground-connected wall and the transverse hook steel bars in the steel cage of the later cast ground-connected wall. The two wall side connecting steel plates are symmetrically distributed on both sides of the center line of the wall;

[0011] The bifurcated connecting steel plates are arranged inside the ground-to-wall joints, symmetrically distributed on both sides of the wall centerline, and tightly buckled with the two wall side connecting steel plates;

[0012] The waterproof component is arranged near the joint between the two wall connecting steel plates and the forked connecting steel plates;

[0013] The combination of the wall side connecting steel plate and the bifurcated connecting steel plate is used to prevent water outside the ground-connected wall from forming a leakage path in the thickness direction of the wall.

[0014] The wall-connecting steel plate includes: a bent steel plate and an L-shaped steel plate; wherein, the outer side of the short side of the bent steel plate is connected and fixed to the inner side of the steel cage of the first cast ground-connected wall, the long side of the bent steel plate points to the first cast wall, the inner side of the long side of the L-shaped steel plate is perpendicular to and connected and fixed to the end of the long side of the bent steel plate, and the short side of the L-shaped steel plate points to the outside of the wall.

[0015] The bifurcated connecting steel plate includes: a main connecting steel plate, a first connecting steel plate, a blocking steel plate, a second connecting steel plate, and a positioning steel plate; wherein,

[0016] The main connecting steel plate is located on the wall center line, and one end of the main connecting steel plate located on the side of the later cast ground tether wall is connected and fixed to the first connecting steel plate symmetrically distributed on both sides of the wall center line; one end of the main connecting steel plate located on the side of the first cast ground tether wall is connected and fixed to the second connecting steel plate symmetrically distributed on both sides of the wall center line;

[0017] A barrier steel plate is vertically fixed near the end of the first connecting steel plate to form a cross-shaped connection;

[0018] A positioning steel plate is vertically fixed to the end of the second connecting steel plate to form a T-shaped connection, and one side of the positioning steel plate is parallelly overlapped with the inner side of the long side of the L-shaped steel plate.

[0019] The waterproof component is used to prevent water leakage at the overlap of the long sides of the positioning steel plate and the L-shaped steel plate, and includes: a first waterproof rubber belt, a second waterproof rubber belt, a second waterproof foam board, a third waterproof foam board and a fourth waterproof foam board, wherein one side of the first waterproof rubber belt is connected and fixed to the inner side of the long side of the bent steel plate and is aligned with the end of the long side of the bent steel plate, and the other side of the first waterproof rubber belt is in contact with the end of the positioning steel plate; one side of the second waterproof rubber belt is connected and fixed to the inner side of the second connecting steel plate and is aligned with the end of the second connecting steel plate, and the other side of the second waterproof rubber belt is in contact with the end of the long side of the L-shaped steel plate;

[0020] The second waterproof foam plate is connected and fixed to the outer side of the long side of the L-shaped steel plate;

[0021] The third waterproof foam board and the fourth waterproof foam board are connected and fixed to the outer side of the positioning steel plate, and are respectively aligned with the ends of the positioning steel plate, and a groove is left between the third waterproof foam board and the fourth waterproof foam board.

[0022] It also includes an anti-bypass barrier, which is connected and fixed to the outer side of the short side of the bent steel plate and aligned with the bent part of the bent steel plate. It is used to block the concrete of the ground-connected wall cast first at the anti-bypass barrier when pouring concrete.

[0023] The anti-bypass barrier is in the form of a strip capable of blocking the bypass of concrete, and includes any one of a rubber strip, a hollow rubber strip, a foam strip, a foam tube, a steel plate and a steel tube.

[0024] The hooks of the transverse hook steel bars are arranged closely to the outer sides of the long sides of the bent steel plates.

[0025] It also includes a first waterproof foam board arranged along the depth direction of the ground-connected wall and having a length consistent with the depth of the ground-connected wall. The first waterproof foam board is connected and fixed to the inner side of the steel cage of the post-cast ground-connected wall and is close to the bend of the transverse bend steel bar.

[0026] The present invention further discloses a construction method of an underground continuous wall waterproof joint structure, based on the underground continuous wall waterproof joint structure, comprising the following steps:

[0027] Step 1: According to the design requirements, the wall connection steel plates and forked connection steel plates are made in the factory and transported to the construction site after inspection;

[0028] Step 2: According to the design requirements, connect and fix the corresponding parts of the waterproof assembly to the two wall connection steel plates and the forked connection steel plates, and connect and fix the anti-bypass barrier to the two wall connection steel plates;

[0029] Step 3: According to the design requirements, excavate and cast the ground-connected wall trench section first to control the trench quality;

[0030] Step 4: According to the design requirements, make a steel cage for pouring the ground-connected wall first, and connect and fix the two wall connection steel plates to the inner side of the steel cage for pouring the ground-connected wall first;

[0031] Step 5: Use a crane to hoist the steel cage of the first cast ground-connected wall, the two wall connecting steel plates, some waterproof components, and the anti-bypass barrier into the first cast ground-connected wall groove section;

[0032] Step 6: Use a crane to hoist the forked connecting steel plate and part of the waterproof components into the first cast ground connecting wall groove section. The forked connecting steel plate is locked with the two wall connecting steel plates and cannot be moved;

[0033] Step 7: pouring concrete, the side pressure of the wall core concrete acts on the outer side of the bifurcated connecting steel plate, so that the bifurcated connecting steel plate is tightly buckled with the two wall side connecting steel plates;

[0034] Step 8: Cast the ground-connecting wall trench section after excavation to control the trench quality;

[0035] Step 9: According to the design requirements, a steel cage of the post-cast ground-connected wall is manufactured. The bending angle of the transverse hook steel bars in the steel cage of the post-cast ground-connected wall is complementary to the bending angle of the connecting steel plate at the wall side;

[0036] Step 10: Use a crane to hoist the steel cage of the post-cast ground-connected wall into the post-cast ground-connected wall groove section, and the hooks of the transverse hook steel bars are in close contact with the outer sides of the connecting steel plates on the two walls;

[0037] Step 11: Pour the concrete and then pour the ground connection wall after completion.

[0038] The beneficial effects of the present invention are:

[0039] First, the wall side connection steel plate and the bifurcated connection steel plate at the underground continuous wall joint in the present invention are combined into a complex bifurcated structure, so that the compactness of the connection between the concrete and the steel plate at the joint is good, which can effectively reduce the occurrence of cracks; in addition, the complex bifurcated structure enhances the overall rigidity of the joint, improves the bearing performance and anti-deformation performance of the joint, and can also effectively reduce the possibility of cracks and water leakage;

[0040] Second, the waterproof foam board at the joint of the underground continuous wall in the present invention can block water leakage and increase the water leakage path at the potential cracks in the concrete, reducing the possibility of water leakage;

[0041] Third, the complex bifurcated structure at the joint of the underground continuous wall in the present invention can effectively prevent the water outside the underground continuous wall from forming a leakage path in the thickness direction of the wall. The potential paths are blocked by the complex bifurcated structure, which greatly reduces the possibility of water leakage.

[0042] Fourthly, the ground-connected wall waterproof joint structure provided by the present invention has a simple and clear structure, excellent mechanical properties, fast construction, flexible procedures, is suitable for standardized production at construction sites, and is conducive to large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a horizontal cross-sectional schematic diagram of an underground continuous wall waterproof joint structure according to an embodiment of the present invention;

[0044] Figure 2 This is a horizontal cross-sectional schematic diagram of the joint structure when the second connecting steel plate is in a straight line according to another embodiment of the present invention;

[0045] In the figure, 1-rebar cage of the ground-connected wall cast first; 2-rebar cage of the ground-connected wall cast later; 2-1-transverse bent hook steel bar; 2-2-first waterproof foam board; 3-wall connecting steel plate; 3-1-bent steel plate; 3-2-L-shaped steel plate; 4-forked connecting steel plate; 4-1-main connecting steel plate; 4-2-first connecting steel plate; 4-3-blocking steel plate; 4-4-second connecting steel plate; 4-5-positioning steel plate; 5-waterproof assembly; 5-1-first waterproof rubber belt; 5-2-second waterproof rubber belt; 5-3-second waterproof foam board; 5-4-third waterproof foam board; 5-5-fourth waterproof foam board; 6-anti-bypass barrier. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] like Figure 1 As shown, this embodiment is a horizontal cross-sectional schematic diagram of the application of the underground continuous wall waterproof joint structure;

[0048] Since the joint structure is mirror-symmetrical on the center line of the wall, a detailed description is given taking one side of the center line of the wall as an example:

[0049] In the wall connection steel plate 3, the outer side of the short side of the bent steel plate 3-1 is welded to the inner side of the steel cage 1 of the first cast ground-connected wall, and the long side of the bent steel plate 3-1 points to the first cast wall;

[0050] The inner side of the long side of the L-shaped steel plate 3-2 is welded to the end of the long side of the bent steel plate 3-1, the two are perpendicular, and the short side of the L-shaped steel plate 3-2 points to the outside of the wall;

[0051] In the bifurcated connecting steel plate 4, the main connecting steel plate 4-1 is located on the center line of the wall, and the end portion located on one side of the post-cast ground connecting wall is welded to the outer side of the convex corner tip of the first connecting steel plate 4-2. The angle bisector of the first connecting steel plate 4-2 coincides with the center line of the wall, and is symmetrically distributed on both sides of the center line of the wall, pointing to the outside of the wall;

[0052] The barrier steel plate 4-3 is perpendicular to the edge of the first connecting steel plate 4-2, and the end is welded to the first connecting steel plate 4-2 near the end, forming a cross shape in part;

[0053] The end of the main connecting steel plate 4-1 located on the side of the first cast ground connection wall is welded to the inner side of the convex corner tip of the second connecting steel plate 4-4. The angle bisector of the second connecting steel plate 4-4 coincides with the center line of the wall. The second connecting steel plate 4-4 is symmetrically distributed on both sides of the center line of the wall, pointing to the outside of the wall, and the plate edge is parallel to the long side of the bent steel plate 3-1.

[0054] The positioning steel plate 4-5 is welded to the end of the second connecting steel plate 4-4, and the two are perpendicular to each other, forming a T-shape in part;

[0055] In the waterproof assembly 5, the first waterproof rubber belt 5-1 is adhered to the inner side of the long side of the bent steel plate 3-1 and aligned with the end of the long side;

[0056] The second waterproof rubber belt 5-2 is attached to the inner side of the second connecting steel plate 4-4 and aligned with the end;

[0057] The second waterproof foam board 5-3 is pasted on the outside of the long side of the L-shaped steel plate 3-2 and aligned with the end of the long side;

[0058] The third waterproof foam board 5-4 and the fourth waterproof foam board 5-5 are pasted on the outside of the positioning steel plate 4-5 and are aligned with the ends of the positioning steel plate 4-5 respectively, and a groove is left between the third waterproof foam board 5-4 and the fourth waterproof foam board 5-5;

[0059] The positioning steel plate 4-5 is close to the long side of the L-shaped steel plate 3-2, the end of the positioning steel plate 4-5 is close to the first waterproof rubber belt 5-1, and the end of the long side of the L-shaped steel plate 3-2 is close to the second waterproof rubber belt 5-2;

[0060] The bypass barrier 6 is pasted on the outside of the short side of the bent steel plate 3-1 and aligned with the bend;

[0061] In the steel cage 2 of the post-cast ground-connected wall, the hook of the transverse hook steel bar 2-1 is in close contact with the outer side of the long side of the bent steel plate 3-1; the first waterproof foam board 2-2 is attached to the inner side of the steel cage 2 of the post-cast ground-connected wall, in close contact with the hook of the transverse hook steel bar 2-1;

[0062] exist Figure 2 In the embodiment shown, this embodiment and Figure 1 The two are roughly the same, the only difference is that the second connecting steel plate 4-4 is straight, and the second waterproof foam board 5-3 is not aligned with the long side end of the L-shaped steel plate 3-2.

[0063] In all embodiments: the sizes of the first waterproof foam board, the bent steel board, the L-shaped steel board, the anti-bypass barrier, the main connecting steel board, the first connecting steel board, the barrier steel board, the second connecting steel board, the positioning steel board, the first waterproof rubber belt, the second waterproof rubber belt, the second waterproof foam board, the third waterproof foam board, and the fourth waterproof foam board are determined by the specifications of the ground-connected wall and the construction conditions;

[0064] The bending angle of the bent steel plate can be adjusted according to actual conditions;

[0065] The angle of the first connecting steel plate can be adjusted according to actual conditions;

[0066] The bent steel plate can be formed by bending a whole steel plate, or by connecting and fixing two steel plates, and the connection method can be welding connection, bolt connection, rivet connection, bonding or other reliable connection;

[0067] The L-shaped steel plate can be formed by bending a whole steel plate, or by connecting and fixing two steel plates, and the connection method can be welding connection, bolt connection, rivet connection, bonding or other reliable connection;

[0068] The inner side of the long side of the L-shaped steel plate and the end of the long side of the bent steel plate can be connected by welding, bolting, riveting, gluing or other reliable connections;

[0069] The end of the barrier steel plate and the edge of the first connecting steel plate can be connected by welding, bolting, riveting, gluing or other reliable connections;

[0070] The outer side of the convex corner tip of the first connecting steel plate and the end of the main connecting steel plate can be connected by welding, bolting, riveting, gluing or other reliable connections;

[0071] The first connecting steel plate may be a whole steel plate, or two steel plates connected and fixed together, and the connection method may be welding connection, bolt connection, rivet connection, bonding or other reliable connection;

[0072] The end of the positioning steel plate and the second connecting steel plate can be connected by welding, bolting, riveting, gluing or other reliable connections;

[0073] The inner side of the convex corner tip of the second connecting steel plate and the end of the main connecting steel plate can be connected by welding, bolting, riveting, gluing or other reliable connections;

[0074] The second connecting steel plate may be a whole steel plate, or two steel plates connected and fixed together, and the connection method may be welding connection, bolt connection, rivet connection, bonding or other reliable connection;

[0075] The anti-bypass barrier can be in the form of a rubber strip, a hollow rubber strip, a foam strip, a foam tube, a steel plate, a steel tube, etc., which can prevent the concrete from bypassing.

[0076] by Figure 1 Taking the underground continuous wall waterproof joint structure in the embodiment as an example, a construction method of an underground continuous wall waterproof joint is described, including the following steps:

[0077] Step 1: According to the design requirements, the bent steel plate 3-1, L-shaped steel plate 3-2, main connecting steel plate 4-1, first connecting steel plate 4-2, blocking steel plate 4-3, second connecting steel plate 4-4, and positioning steel plate 4-5 are manufactured in the factory, wherein half of the angle of the second connecting steel plate 4-4 and the angle of the bent steel plate 3-1 must be consistent;

[0078] Step 2: According to the design requirements, two wall connecting steel plates 3 are manufactured in the factory. The manufacturing process of each wall connecting steel plate 3 is as follows: the inner side of the long side of the L-shaped steel plate 3-2 is welded to the end of the long side of the bent steel plate 3-1, and the two are kept vertical. After the manufacturing is completed and inspected, they are transported to the construction site;

[0079] Step 3: According to the design requirements, the forked connecting steel plate 4 is manufactured in the factory. The manufacturing process is as follows: the end of the blocking steel plate 4-3 is vertically welded to the edge of the first connecting steel plate 4-2 to form a cross shape locally, the outer side of the convex corner tip of the first connecting steel plate 4-2 is welded to the end of the main connecting steel plate 4-1, the positioning steel plate 4-5 is welded to the end of the second connecting steel plate 4-4 to form a T shape locally, the inner side of the convex corner tip of the second connecting steel plate 4-4 is welded to the other end of the main connecting steel plate 4-1, and the manufacturing is completed and inspected to be qualified before being transported to the construction site;

[0080] Step 4: Connect and fix the corresponding parts of the waterproof component 5 to the two wall-side connecting steel plates 3 and the forked connecting steel plate 4 respectively. The manufacturing process is as follows: stick the first waterproof rubber belt 5-1 to the inner side of the long side of the bent steel plate 3-1 and align it with the end of the long side; stick the second waterproof rubber belt 5-2 to the inner side of the second connecting steel plate 4-4 and align it with the end; stick the second waterproof foam board 5-3 to the outer side of the long side of the L-shaped steel plate 3-2 and align it with the end of the long side; stick the third waterproof foam board 5-4 and the fourth waterproof foam board 5-5 to the outer side of the positioning steel plate 4-5 and align them with the ends of the positioning steel plate 4-5 respectively to form a groove locally;

[0081] Step 5: Paste the anti-bypass barrier 6 on the outer side of the short side of the bent steel plate 3-1 and align it with the bent part of the bent steel plate 3-1;

[0082] Step 6: According to the design requirements, excavate and cast the ground-connected wall trench section first, and strictly control the trench quality;

[0083] Step 7: According to the design requirements, a steel cage 1 for the first cast ground-connected wall is manufactured, and the outer sides of the short sides of the bent steel plates 3-1 in the two wall-side connecting steel plates 3 are respectively welded to the inner sides of the steel cage 1 for the first cast ground-connected wall, with the long sides of the bent steel plates 3-1 pointing to the first cast wall;

[0084] Step 8: Use a crane to hoist the steel cage 1 of the first cast ground-connected wall, the two wall-side connecting steel plates 3, part of the waterproof component 5, and the anti-bypass barrier 6 into the first cast ground-connected wall groove section;

[0085] Step 9: Use a crane to hoist the forked connecting steel plate 4 into the first cast ground-connecting wall groove section, the positioning steel plate 4-5 of the forked connecting steel plate 4 is close to the long side of the L-shaped steel plate 3-2, the end of the positioning steel plate 4-5 is close to the first waterproof rubber belt 5-1, and the end of the long side of the L-shaped steel plate 3-2 is close to the second waterproof rubber belt 5-2, so that the forked connecting steel plate 4 is locked with the two wall connecting steel plates 3 and cannot move;

[0086] Step 10: pouring concrete. The side pressure of the wall core concrete acts on the outer side of the second connecting steel plate 4-4, so that the bifurcated connecting steel plate 4 is tightly buckled with the two wall connecting steel plates 3. The outer protective layer concrete of the steel cage stops at the anti-bypass barrier 6, and the first pouring of the ground-connected wall is completed;

[0087] Step 11: Cast the ground-connected wall trench section after excavation and strictly control the trench quality;

[0088] Step 12: According to the design requirements, a steel cage 2 of the post-cast ground-connected wall is manufactured, the bending angle of the transverse hook steel bar 2-1 in the steel cage 2 of the post-cast ground-connected wall is complementary to the bending angle of the bent steel plate 3-1, and the first waterproof foam board 2-2 is pasted on the inner side of the steel cage 2 of the post-cast ground-connected wall, close to the hook of the transverse hook steel bar 2-1;

[0089] Step 13: Use a crane to hoist the steel cage 2 of the post-cast ground-connected wall into the post-cast ground-connected wall groove section, and the hooks of the transverse hook steel bars 2-1 are tightly attached to the outer side of the long side of the bent steel plate 3-1, so that the joint remains in a straight line;

[0090] Step 14: Pour the concrete and once completed pour the ground connection wall.

[0091] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. An underground continuous wall waterproof joint structure, arranged between the first cast ground continuous wall and the later cast ground continuous wall, characterized in that: It includes a device arranged along the depth direction of the ground-connected wall and having a length consistent with the depth of the ground-connected wall, Two wall side connecting steel plates (3) are arranged between the inner side of the outer end of the steel cage (1) of the first cast ground-connected wall and the transverse hook steel bars (2-1) in the steel cage (2) of the second cast ground-connected wall, and the two wall side connecting steel plates are symmetrically distributed on both sides of the center line of the wall; The bifurcated connecting steel plates (4) are arranged inside the ground-to-wall joint, symmetrically distributed on both sides of the wall centerline, and tightly buckled with the two wall side connecting steel plates; A waterproof component (5) is arranged near the joint between the two wall-side connecting steel plates and the forked connecting steel plates; The combination of the wall side connecting steel plate, the bifurcated connecting steel plate and the waterproof component is used to prevent the water outside the ground-connected wall from forming a leakage path in the thickness direction of the wall.

2. The underground continuous wall waterproof joint structure according to claim 1, characterized in that: The wall-connecting steel plate comprises: a bent steel plate and an L-shaped steel plate; wherein the outer side of the short side of the bent steel plate (3-1) is connected and fixed to the inner side of the steel cage of the first cast ground-connected wall, and the long side of the bent steel plate points to the first cast wall; the inner side of the long side of the L-shaped steel plate (3-2) is perpendicular to and connected and fixed to the end of the long side of the bent steel plate, and the short side of the L-shaped steel plate points to the outside of the wall.

3. The underground continuous wall waterproof joint structure according to claim 1, characterized in that: The bifurcated connecting steel plate (4) comprises: a main connecting steel plate, a first connecting steel plate, a blocking steel plate, a second connecting steel plate and a positioning steel plate; wherein the main connecting steel plate (4-1) is located on the wall center line, and one end thereof located on the side of the post-cast ground connecting wall is connected and fixed to the first connecting steel plate (4-2) symmetrically distributed on both sides of the wall center line; one end of the main connecting steel plate located on the side of the pre-cast ground connecting wall is connected and fixed to the second connecting steel plate (4-4) symmetrically distributed on both sides of the wall center line; A barrier steel plate (4-3) is vertically fixed near the end of the first connecting steel plate to form a cross-shaped connection; A positioning steel plate (4-5) is vertically fixed to the end of the second connecting steel plate to form a T-shaped connection, and one side of the positioning steel plate is parallelly overlapped with the inner side of the long side of the L-shaped steel plate.

4. The underground continuous wall waterproof joint structure according to claim 1, characterized in that: The waterproof component (5) is used to prevent water leakage at the overlap of the long sides of the positioning steel plate and the L-shaped steel plate, and comprises: a first waterproof rubber belt, a second waterproof rubber belt, a second waterproof foam board, a third waterproof foam board and a fourth waterproof foam board; wherein one side of the first waterproof rubber belt (5-1) is connected and fixed to the inner side of the long side of the bent steel plate and is aligned with the end of the long side of the bent steel plate, and the other side of the first waterproof rubber belt is in contact with the end of the positioning steel plate; one side of the second waterproof rubber belt (5-2) is connected and fixed to the inner side of the second connecting steel plate and is aligned with the end of the second connecting steel plate, and the other side of the second waterproof rubber belt is in contact with the end of the long side of the L-shaped steel plate; The second waterproof foam plate (5-3) is connected and fixed to the outer side of the long side of the L-shaped steel plate; The third waterproof foam plate (5-4) and the fourth waterproof foam plate (5-5) are connected and fixed to the outer side of the positioning steel plate and are respectively aligned with the ends of the positioning steel plate, and a groove is left between the third waterproof foam plate and the fourth waterproof foam plate.

5. The underground continuous wall waterproof joint structure according to claim 1, characterized in that: It also includes an anti-bypass barrier (6), which is connected and fixed to the outer side of the short side of the bent steel plate and is aligned with the bent part of the bent steel plate. It is used to block the concrete of the ground-connected wall cast first at the anti-bypass barrier when pouring concrete.

6. The underground continuous wall waterproof joint structure according to claim 5, characterized in that: The anti-bypass barrier is in the form of a strip capable of blocking the bypass of concrete, and includes any one of a rubber strip, a hollow rubber strip, a foam strip, a foam tube, a steel plate and a steel tube.

7. The underground continuous wall waterproof joint structure according to claim 1, characterized in that: The hooks of the transverse hook steel bars are arranged closely to the outer sides of the long sides of the bent steel plates.

8. The underground continuous wall waterproof joint structure according to claim 1, characterized in that: It also includes a first waterproof foam board (2-2) arranged along the depth direction of the ground-connected wall and having a length consistent with the depth of the ground-connected wall. The first waterproof foam board is connected and fixed to the inner side of the steel cage of the post-cast ground-connected wall and is close to the bend of the transverse bend steel bar.

9. A construction method of an underground continuous wall waterproof joint structure, based on the underground continuous wall waterproof joint structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: According to the design requirements, the wall connection steel plates and forked connection steel plates are made in the factory and transported to the construction site after inspection; Step 2: According to the design requirements, connect and fix the corresponding parts of the waterproof assembly to the two wall connection steel plates and the forked connection steel plates, and connect and fix the anti-bypass barrier to the two wall connection steel plates; Step 3: According to the design requirements, excavate and cast the ground-connected wall trench section first to control the trench quality; Step 4: According to the design requirements, make a steel cage for pouring the ground-connected wall first, and connect and fix the two wall connection steel plates to the inner side of the steel cage for pouring the ground-connected wall first; Step 5: Use a crane to hoist the steel cage of the first cast ground-connected wall, the two wall connecting steel plates, some waterproof components, and the anti-bypass barrier into the first cast ground-connected wall groove section; Step 6: Use a crane to hoist the forked connecting steel plate and part of the waterproof components into the first cast ground connecting wall groove section. The forked connecting steel plate is locked with the two wall connecting steel plates and cannot be moved; Step 7: pouring concrete, the side pressure of the wall core concrete acts on the outer side of the bifurcated connecting steel plate, so that the bifurcated connecting steel plate is tightly buckled with the two wall side connecting steel plates; Step 8: Cast the ground-connecting wall trench section after excavation to control the trench quality; Step 9: According to the design requirements, a steel cage of the post-cast ground-connected wall is manufactured. The bending angle of the transverse hook steel bars in the steel cage of the post-cast ground-connected wall is complementary to the bending angle of the connecting steel plate at the wall side; Step 10: Use a crane to hoist the steel cage of the post-cast ground-connected wall into the post-cast ground-connected wall groove section, and the hooks of the transverse hook steel bars are in close contact with the outer sides of the connecting steel plates on the two walls; Step 11: Pour the concrete and then pour the ground connection wall after completion.

Images