Construction method of underground continuous wall and TRD connection water stop system

Abstract

This invention relates to a construction method for a diaphragm wall and TRD (Transient Drilling) connection water-stopping system, comprising the following specific steps: Step 1) High-pressure jet grouting pile construction: After the high-pressure jet grouting drilling rig is in place, grouting is carried out using the drilling rig. A mobile support rapid backfilling structure is used for grout replenishment and pressure grouting, thereby completing the construction of one high-pressure jet grouting pile; then the high-pressure jet grouting drilling rig is moved to the next pile for construction; Step 2) Diaphragm wall construction: The diaphragm wall foundation trench is excavated, and then a reinforcing cage is hoisted into the diaphragm wall foundation trench and concrete is poured to complete the diaphragm wall construction; Step 3) Water-stopping construction of the connection section: Closed-loop steel sheet piles are installed on the outside of the high-pressure jet grouting pile for water-stopping; Step 4) Connection joint construction: The irregularly shaped steel is welded to the reinforcing cage and then lowered into the diaphragm wall foundation trench simultaneously with the reinforcing cage; concrete is poured at the connection joint to complete the connection joint construction. This invention has the characteristics of high safety in foundation pit excavation, good quality of high-pressure jet grouting piles, and simple operation, and has good comprehensive benefits.

Description

Technical Field

[0001] This invention relates to a construction method for a water-stopping system connecting a diaphragm wall and a TRD (Transient Dysfunction Injection) system, which is mainly applicable to the construction of water-stopping systems connecting diaphragm walls and TRDs, and belongs to the field of civil engineering technology. Background Technology

[0002] During foundation pit excavation, diaphragm wall and TRD (Transformer Retaining Structure) structures are commonly used for enclosure, water retention, and support to ensure the safety of the foundation pit construction. During construction, either diaphragm wall or TRD retaining structures are selected based on the geological conditions of the foundation pit. However, due to the structural differences between the two support systems, construction joints inevitably exist between the two structures, leading to water leakage between the TRD and diaphragm wall retaining structures, thus jeopardizing the safety of the foundation pit construction. Furthermore, during the construction of the retaining structure, problems such as trench collapse and misalignment of H-beam insertion can easily occur.

[0003] The following construction problems may be encountered in the construction of the connection between the diaphragm wall and the TRD in water-rich and silty soft soil areas: (1) The traditional high-pressure jet grouting pile has low backfilling efficiency, and the poor quality of the high-pressure jet grouting pile will be caused by the failure to deal with it in time; (2) The traditional diaphragm wall guide wall foundation trench support adopts the wooden support system, which has the disadvantages of being unstable and is prone to foundation trench collapse; (3) Effective water-stopping measures need to be adopted when the connection section is constructed in a water-rich environment, so as to reduce the impact on the construction quality of the connection section; (4) The traditional water-stopping effect of the connection section is not good, and leakage may occur, which will affect the construction safety during the foundation pit excavation process.

[0004] In view of this, in response to a series of problems that arise during the construction of the connection between diaphragm walls and TRD for water sealing, there is an urgent need to invent a simple and effective construction method for the connection between diaphragm walls and TRD for water sealing system, so as to improve the safety of foundation pit excavation construction, especially for foundation pit excavation construction in water-rich and silty soft soil areas, which has the advantages of significantly saving construction costs, speeding up construction progress and improving construction safety performance. Summary of the Invention

[0005] The purpose of this invention is to improve the safety of foundation pit excavation construction, especially for foundation pit excavation construction in water-rich and silty soft soil areas, which has the advantages of significantly saving construction costs, accelerating construction progress and improving construction safety performance.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This invention relates to a construction method for a water-stopping system connecting a diaphragm wall and a TRD (Transient Drainage Deposition) system, comprising the following specific steps:

[0008] Step 1) High-pressure jet grouting pile construction: After the site leveling and construction surveying are completed, the high-pressure jet grouting drilling rig is positioned. After the high-pressure jet grouting drilling rig is positioned, the drilling and grouting construction is carried out. The grouting construction is completed by spraying grout first and then rotating and lifting. The grouting is replenished and pressure grouting is carried out by a mobile support rapid backfilling structure, thereby completing the construction of one high-pressure jet grouting pile. Then the high-pressure jet grouting drilling rig is moved to the next pile for construction, and the cycle is repeated until the construction of all high-pressure jet grouting piles is completed.

[0009] Step 2) Construction of diaphragm wall; excavate the diaphragm wall foundation trench. After the diaphragm wall foundation trench is excavated, a prefabricated internal bracing guide wall structure or a standardized steel support system for the trench is used to achieve stable support of the foundation trench. Then, a steel cage is hoisted into the diaphragm wall foundation trench and concrete is poured to complete the diaphragm wall construction.

[0010] Step 3) Water-stopping construction of the connection section; a closed-loop steel sheet pile is installed on the outside of the high-pressure jet grouting pile for water-stopping, and a grouting pipe is installed on the inside of the closed-loop steel sheet pile. If the water-stopping effect is not good after the construction of the closed-loop steel sheet pile is completed, grout is injected into the soil through the grouting pipe.

[0011] Step 4) Construction of the joint: After welding the irregular steel section to the reinforcing cage, it is lowered into the diaphragm wall foundation trench simultaneously with the reinforcing cage. The irregular steel section is set at the joint between the diaphragm wall and the TRD method pile. Concrete is poured at the joint to complete the joint construction.

[0012] Preferably, in step 1), the mobile support rapid recharge structure includes a frame, on which a movable body is mounted; a winch is mounted on the frame, with one end of a cable connected to the winch and the other end connected to the return tank; the return tank has a box-like structure, with a grouting hole at the top, a cavity inside, a grout outlet at the bottom, and ear plates on both sides; a telescopic rod is provided between the ear plate on one side of the return tank and the frame, and a positioning rod is provided between the ear plate on the other side of the return tank and the frame.

[0013] Preferably, the return tank is welded from six steel plates.

[0014] Preferably, in step 1), when performing grouting and pressure grouting using a mobile support structure for rapid backfilling, the specific method is as follows: Move the frame above the high-pressure jet grouting pile that has just been sprayed; adjust the height of the return tank using a winch so that the lower end of the return tank is close to the upper surface of the high-pressure jet grouting pile; then lock the positioning rod to fix the return tank at this height; inject grout into the return tank through the grouting hole, and the concrete grout flows out from the grout outlet at the lower end of the return tank to perform grouting and pressure grouting on the high-pressure jet grouting pile; after grouting and pressure grouting are completed, move the frame above the next high-pressure jet grouting pile using the mobile support structure to perform grouting and pressure grouting on the next high-pressure jet grouting pile.

[0015] Preferably, in step 2), the trench-shaped steel support system includes longitudinal steel sections and irregularly shaped steel plates. The longitudinal steel sections are installed on the inner walls of both sides of the diaphragm wall foundation trench, and are arranged along the length of the diaphragm wall foundation trench. A steel panel is installed on the upper surface of the longitudinal steel section, and the steel panel is laid on the ground on both sides of the upper end of the diaphragm wall foundation trench. The steel panel is fixed to the ground by anchors. The irregularly shaped steel plates are installed on the inner walls of both sides of the diaphragm wall foundation trench, with the side walls of the longitudinal steel sections tightly attached to the irregularly shaped steel plates. The irregularly shaped steel plates are laid sequentially along the length of the diaphragm wall foundation trench, and a steel plate connection seam is formed between two adjacent irregularly shaped steel plates. An inner support steel section is provided between two opposite irregularly shaped steel plates, and a top inner support steel section is provided above the steel plate connection seam.

[0016] Preferably, in step 2), the prefabricated internal support guide wall structure includes guide wall steel plates, crossbars, and structural steel. The guide wall steel plates are installed on the guide walls on both sides of the diaphragm wall foundation trench. Inclined ear plates and ear plates are set on the guide wall steel plates. The ear plates are set below the inclined ear plates. One end of the crossbar is connected to the ear plate by bolts, and the other end of the crossbar is welded with angle steel. The inclined ear plates are connected to the upper part of the structural steel through a flexible connector. The bottom of the structural steel is close to the angle steel and connected to the angle steel. The crossbars are horizontally supported between the structural steel on both sides.

[0017] Preferably, in step 4), the irregular steel section is composed of an inclined steel plate, a vertical steel plate, and a horizontal steel plate. Two inclined steel plates are welded to one end of the vertical steel plate to form a "Y" shape, and the other end of the vertical steel plate is welded perpendicularly to the horizontal steel plate.

[0018] This invention has the following characteristics and beneficial effects:

[0019] 1. The construction of diaphragm wall foundation trench support adopts a standardized steel support system for trenches or a prefabricated internal bracing guide wall structure, which improves the support efficiency.

[0020] 2. The use of a mobile support structure for rapid recharge grouting simplifies the recharge process, accelerates construction efficiency, and ensures the quality of high-pressure jet grouting pile construction.

[0021] 3. The adoption of a closed-loop water-stop structure on the outside of the high-pressure jet grouting piles enables rapid water-stopping at the connection section, ensuring construction safety during the excavation of the diaphragm wall foundation trench.

[0022] 4. The use of irregularly shaped steel structures in the connection section ensures the construction quality of the connection section and improves the water-stopping effect of the connection section. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the grooved, standardized steel support system of the present invention;

[0024] Figure 2 This is a schematic diagram of the prefabricated internal support guide wall structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the rapid reflow structure of the mobile support of the present invention;

[0026] Figure 4 This is a schematic diagram of the return tank structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the water-stopping construction at the joint of the present invention;

[0028] Figure 6 This is a construction diagram of the connection point of the present invention;

[0029] Among them: 1. Groove steel, 2. Internal support steel, 3. Steel plate joint, 4. Irregular steel plate, 5. Steel panel, 6. Top internal support steel, 7. Anchor nail, 8. Trench, 9. Moving body, 10. Grouting hole, 11. Frame, 12. Cable, 13. Winch, 14. Pulley, 15. Telescopic rod, 16. Positioning rod, 17. Ear plate, 18. Refill body, 19. High-pressure jet grouting pile, 20. Grout outlet, 21. Steel plate, 22. Enclosure body, 23. 24. Horizontal brace, 25. Structural steel, 26. Flexible connector, 27. Guide wall steel plate, 28. Inclined ear plate, 29. Diaphragm wall soil, 30. Ear plate, 31. Angle steel, 32. Reinforcing bar, 33. Reinforcing cage, 34. Grouting pipe, 35. Closed-loop sheet pile, 36. L-shaped reinforcing bar, 37. Waterstop steel plate, 38. Sleeve, 39. Inclined steel plate, 40. Vertical steel plate, 41. Horizontal steel plate, 42. Irregular shaped steel, 43. TRD method pile. Detailed Implementation

[0030] Example 1

[0031] This invention relates to a diaphragm wall and TRD (Traction Controlled Refrigerant) connection water-stopping system, comprising a standardized steel support system for the trench, a mobile support rapid recharge structure, a prefabricated internal support guide wall structure, a high-pressure jet grouting pile outer closed-loop water-stopping structure, an internally attached water-stopping steel plate structure, and an irregularly shaped connection water-stopping steel structure. The construction method of the diaphragm wall and TRD connection water-stopping system mainly includes the following steps: high-pressure jet grouting pile construction, diaphragm wall construction, connection section water-stopping construction, and connection joint construction.

[0032] like Figure 1As shown, after the diaphragm wall foundation trench 8 is excavated, it can be supported by a standardized steel support system. This system includes longitudinal steel sections 1 and shaped steel plates 4. After the trench 8 is excavated, the longitudinal steel sections 1 are installed on the inner walls of both sides of the trench 8. These sections are made of I-beams and are arranged along the length of the trench 8. Steel panels 5 are installed on the upper surface of the longitudinal steel sections 1 and laid on the ground on both sides of the upper end of the trench 8. The steel panels 5 are fixed to the ground by anchor bolts 7. The shaped steel plates 4 are installed on the inner walls of both sides of the trench 8. The sidewalls of the longitudinal steel sections 1 are tightly attached to the shaped steel plates 4, which are laid sequentially along the length of the trench 8. A steel plate connection joint 3 is formed between adjacent shaped steel plates 4. An inner support steel section 2 is installed between two opposing shaped steel plates 4, and a top inner support steel section 6 is installed above the steel plate connection joint 3.

[0033] like Figure 2 As shown, after the excavation of the diaphragm wall soil 29, a diaphragm wall foundation trench is formed. The diaphragm wall foundation trench can also be supported by a prefabricated internally braced guide wall structure. The prefabricated internally braced guide wall structure includes guide wall steel plates 27, crossbars 23, and structural steel 25. The guide wall steel plates 27 are installed on the guide walls on both sides of the diaphragm wall foundation trench. Inclined lugs 28 and lugs 30 are provided on the guide wall steel plates 27. The lugs 30 are positioned below the inclined lugs 28. One end of the crossbar 23 is connected to the lugs 30 by bolts, and the crossbar 23 is arranged horizontally. Angle steel 31 is welded to the other end of the crossbar 23. The inclined lugs 28 are connected to the upper part of the structural steel 25 through a flexible connector 26. The bottom of the structural steel 25 is tightly attached to and connected to the angle steel 31. A horizontal brace 24 provides transverse support between the structural steel 25 on both sides. The flexible connector 26 used in this application is a flexible joint, which is existing technology and a commonly used connector in the engineering field.

[0034] like Figure 3 and Figure 4As shown, the mobile support rapid recharge structure includes a frame 11, on which a movable body 9 is mounted. In this invention, the movable body 9 is a wheel located at the lower end of the frame 11, which facilitates the movement of the frame 11. A winch 13 is mounted on the frame 11, with one end of a cable 12 connected to the winch 13 and the other end connected to the return tank 18. A pulley 14 is mounted on the frame 11, and the cable 12 passes around the pulley 14, changing direction through the pulley 14. The return tank 18 is welded from six steel plates 21 and has a box-like structure. The upper end of the return tank 18 has a grouting hole 10, and the interior of the return tank 18 has a cavity. The bottom of the return tank 18 has a grout outlet 20, which occupies half of the area of ​​the bottom of the return tank 18. The area of ​​the bottom of the return tank 18, excluding the grout outlet 20, is a closed body 22. The return tank 18 has ear plates 17 on both sides; a telescopic rod 15 is provided between the ear plate 17 on one side of the return tank 18 and the frame 11, and a positioning rod 16 is provided between the ear plate 17 on the other side of the return tank 18 and the frame 11. Both the telescopic rod 15 and the positioning rod 16 are vertically oriented. The telescopic rod 15 can extend and retract, with its lower end bolted to the ear plate 17 on one side of the return tank 18 and its upper end fixedly connected to the frame 11. The telescopic rod 15 guides the movement of the return tank 18. The positioning rod 16 consists of two rod sections with adjustment grooves. The two rod sections are connected by bolts, which pass through the adjustment grooves. The length of the positioning rod 16 is adjustable, and the bolts allow for locking or loosening between the two rod sections. The winch 13 drives the return tank 18 to move up and down. The telescopic rod 15 guides the up and down movement of the return tank 18. When the return tank 18 moves to the set height, the bolt on the positioning rod 16 is tightened, thereby fixing the return tank 18 at that height.

[0035] like Figure 5 As shown, the high-pressure jet grouting piles 19 are arranged on both sides of the diaphragm wall foundation trench and the TRD method piles 43. The outer closed-loop water-stopping structure includes closed-loop steel sheet piles 35 set on the outside of the high-pressure jet grouting piles 19. The closed-loop steel sheet piles 35 surround the outside of the connection between the diaphragm wall and the TRD method piles 43. A grouting pipe 34 is set on the inside of the closed-loop steel sheet piles 35. The grouting pipe 34 is close to the inside of the closed-loop steel sheet piles 35.

[0036] like Figure 5 As shown, the internal water-stop steel plate structure includes a water-stop steel plate 37, which is set between the diaphragm wall foundation trench and the high-pressure jet grouting pile 19. A sleeve 38 is provided at the bottom of one side of the water-stop steel plate 37, and a reinforcing bar 32 is inserted into the other side of the water-stop steel plate 37. The sleeve 38 is welded to the water-stop steel plate 37 and is set vertically. The reinforcing bar is inserted into the sleeve 38 and embedded in the soil layer. An L-shaped reinforcing bar 36 is provided at the top of the water-stop steel plate, which is welded to the water-stop steel plate 37 and embedded in the soil.

[0037] like Figure 6 As shown, the irregularly shaped water-stop steel structure includes an irregularly shaped steel section 42, which is composed of an inclined steel plate 39, a vertical steel plate 40, and a horizontal steel plate 41. Two inclined steel plates 39 are welded to one end of the vertical steel plate 40 to form a "Y" shape. The other end of the vertical steel plate 40 is welded perpendicularly to the horizontal steel plate 41. The irregularly shaped steel section 42 is welded to a reinforcing cage 33, which is placed in the diaphragm wall foundation trench. The irregularly shaped steel section 42 is set at the connection between the diaphragm wall and the TRD method pile 43.

[0038] Example 2

[0039] The construction method for the connection between the diaphragm wall and the TRD water-stopping system includes the following steps:

[0040] (1) High-pressure jet grouting pile construction: After the site leveling and construction surveying procedures are completed, the high-pressure jet grouting drilling rig is positioned. After the high-pressure jet grouting drilling rig is positioned, the drilling rig is used for grouting construction. The process of grouting first and then rotating and lifting is adopted to complete the grouting construction. The mobile support rapid backfilling structure is used for grouting and pressure grouting, thereby completing the construction of one high-pressure jet grouting pile. Then the high-pressure jet grouting drilling rig is moved to the next pile for construction, and the cycle is repeated until all high-pressure jet grouting piles are completed.

[0041] In this step, a total of two rows of high-pressure jet grouting piles 19 need to be constructed, and the area between the two rows of high-pressure jet grouting piles 19 is used for excavating the diaphragm wall foundation trench.

[0042] The specific method for grouting and pressure grouting using a mobile support structure is as follows: The frame 11 is moved above the high-pressure jet grouting pile that has just been sprayed. The height of the return tank 18 is adjusted using the winch 13 so that the lower end of the return tank 18 is tightly against the upper surface of the high-pressure jet grouting pile 19. Then, the positioning rod 16 is locked to fix the return tank 18 at that height. Grout is injected into the return tank 18 through the grouting hole 10. The concrete grout flows out from the grout outlet 20 at the lower end of the return tank 18, grouting and pressure grouting the high-pressure jet grouting pile 19. After grouting and pressure grouting are completed, the frame 11 is transferred to the next high-pressure jet grouting pile 19 using the moving body 9 for grouting and pressure grouting construction.

[0043] (2) Construction of diaphragm wall: The foundation trench of diaphragm wall is excavated between the two rows of high-pressure jet grouting piles 19. After the foundation trench of diaphragm wall is excavated, the prefabricated internal support guide wall structure or the trench-shaped steel support system is adopted to realize the rapid and stable support of the foundation trench. Then, the steel cage is hoisted into the foundation trench of diaphragm wall and concrete is poured to complete the construction of diaphragm wall.

[0044] (3) Water-stopping construction of the connection section: a closed-loop steel sheet pile 35 is set on the outside of the high-pressure jet grouting pile for water-stopping, and a grouting pipe 34 is set on the inside of the closed-loop steel sheet pile 35. If the water-stopping effect is not good after the construction of the closed-loop steel sheet pile 35 is completed, grout is injected into the soil through the grouting pipe 34.

[0045] (4) Construction at the joint: After welding the irregular steel 42 to the reinforcing cage 33, it is lowered into the diaphragm wall foundation trench at the same time as the reinforcing cage 33. The irregular steel 42 is set at the joint between the diaphragm wall and the TRD method pile 43. Concrete is poured at the joint to complete the construction of the joint.

Claims

1. A construction method for a diaphragm wall and TRD (Transient Drip Resistant Waterproofing) connection water-stopping system, characterized in that, The specific steps include the following: Step 1) Construction of high-pressure jet grouting piles (19): After the site leveling and construction surveying procedures are completed, the high-pressure jet grouting drilling rig is positioned. After the high-pressure jet grouting drilling rig is positioned, the drilling rig is used for grouting construction. The process of grouting first and then rotating and lifting is adopted to complete the grouting construction. The mobile support rapid backfilling structure is used for grouting and pressure grouting, thereby completing the construction of one high-pressure jet grouting pile; then the high-pressure jet grouting drilling rig is moved to the next pile for construction, and the cycle is repeated until the construction of all high-pressure jet grouting piles (19) is completed; the mobile support rapid backfilling structure includes A frame (11) is provided with a movable body (9); a winch (13) is provided on the frame (11), one end of a cable (12) is connected to the winch (13), and the other end is connected to the return tank (18); the return tank (18) has a box structure, with a grouting hole (10) at the top of the return tank (18), a cavity inside the return tank (18), a grout outlet (20) at the bottom of the return tank (18), and ear plates (17) on both sides of the return tank (18); one side of the return tank (18) A telescopic rod (15) is provided between the ear plate (17) and the frame (11), and a positioning rod (16) is provided between the ear plate (17) and the frame (11) on the other side of the return tank (18); the return tank (18) is welded from six steel plates; when the grouting and pressing are carried out by the quick backfilling structure of the moving support, the specific method is as follows: move the frame (11) above the high-pressure jet grouting pile (19) that has just been sprayed, and adjust the height of the return tank (18) by the winch (13) so that the return tank (18) is... The lower end is tightly attached to the upper surface of the high-pressure jet grouting pile (19), and then the positioning rod (16) is locked to fix the return tank (18) at this height position; grout is injected into the return tank (18) through the grouting hole (10), and the concrete grout flows out from the grout outlet (20) at the lower end of the return tank (18) to replenish and pressurize the high-pressure jet grouting pile (19); after the replenishment and pressing are completed, the frame is transferred to the next high-pressure jet grouting pile (19) by the moving body, and the next high-pressure jet grouting pile (19) is replenished and pressed. Step 2) Construction of diaphragm wall: Excavate the diaphragm wall foundation trench, and arrange high-pressure jet grouting piles (19) on both sides of the diaphragm wall foundation trench. After the diaphragm wall foundation trench is excavated, the prefabricated internal support guide wall structure or the trench-shaped steel support system is used to realize the stable support of the foundation trench. Then, the steel cage is hoisted into the diaphragm wall foundation trench and concrete is poured to complete the diaphragm wall construction. Step 3) Water-stopping construction of the connection section: a closed-loop steel sheet pile (35) is set on the outside of the high-pressure jet grouting pile for water-stopping, and a grouting pipe (34) is set on the inside of the closed-loop steel sheet pile (35). If the water-stopping effect is not good after the construction of the closed-loop steel sheet pile is completed, grout is injected into the soil through the grouting pipe. Step 4) Construction at the joint: After welding the irregular steel section (42) to the reinforcing cage (33), it is lowered into the diaphragm wall foundation trench at the same time as the reinforcing cage (33). The irregular steel section (42) is set at the joint between the diaphragm wall and the TRD method pile (43). Concrete is poured at the joint to complete the joint construction. The irregular steel section (42) is composed of inclined steel plate (39), vertical steel plate (40) and horizontal steel plate (41). The two inclined steel plates (39) are welded to one end of the vertical steel plate (40) to form a "Y" shaped structure. The other end of the vertical steel plate (40) is welded perpendicularly to the horizontal steel plate (41).

2. The construction method of the underground diaphragm wall and TRD connection water-stopping system according to claim 1, characterized in that, In step 2), the trench-shaped steel support system includes a longitudinal steel section (1) and a shaped steel plate (4). The longitudinal steel section (1) is set on the inner wall of both sides of the diaphragm wall foundation trench and is arranged along the length of the diaphragm wall foundation trench. A steel panel (5) is set on the upper surface of the longitudinal steel section (1) and is laid on the ground on both sides of the upper end of the diaphragm wall foundation trench. The steel panel (5) is fixed to the ground by anchors (7). The shaped steel plate (4) is set on the inner wall of both sides of the diaphragm wall foundation trench. The side wall of the longitudinal steel section (1) is close to the shaped steel plate (4). The shaped steel plate (4) is laid sequentially along the length of the diaphragm wall foundation trench, and a steel plate connection seam (3) is formed between two adjacent shaped steel plates (4). An inner support steel section (2) is provided between two opposite shaped steel plates (4), and a top inner support steel section (6) is provided above the steel plate connection seam (3).

3. The construction method of the underground diaphragm wall and TRD connection water-stopping system according to claim 1, characterized in that, In step 2), the prefabricated internal support guide wall structure includes a guide wall steel plate (27), a crossbar (23), and a section steel (25). The guide wall steel plate (27) is installed on the guide wall on both sides of the diaphragm wall foundation trench. An inclined ear plate (28) and an ear plate (30) are set on the guide wall steel plate (27). The ear plate (30) is set below the inclined ear plate (28). One end of the crossbar (23) is connected to the ear plate (30) by bolts. An angle steel (31) is welded to the other end of the crossbar (23). The inclined ear plate (28) is connected to the upper part of the section steel (25) through a flexible connector (26). The bottom of the section steel (25) is close to the angle steel (31) and connected to the angle steel (31). The crossbar (24) is horizontally supported between the section steel (25) on both sides.

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