CN-116084390-B - Underground diaphragm wall auxiliary construction structure and construction method

CN116084390BCN 116084390 BCN116084390 BCN 116084390BCN-116084390-B

Abstract

The invention relates to an auxiliary construction structure of an underground diaphragm wall and a construction method thereof, comprising a joint steel plate for separating a pre-construction diaphragm wall groove section and a post-construction diaphragm wall groove section, wherein the joint steel plate comprises sealing plates arranged on two sides, a joint pipe is arranged between the outer side surfaces of the sealing plates and the groove wall surface of the pre-construction diaphragm wall groove section, the outer arc surface of the joint pipe is attached to the outer side surfaces of the sealing plates, the outer arc surface of the joint pipe is attached to the groove wall surface of the pre-construction diaphragm wall groove section, and when in construction, a reinforcement cage of the pre-construction diaphragm wall groove section and the joint steel plate are firstly hoisted into the pre-construction diaphragm wall groove section, and then the joint pipe is hoisted between the outer side surfaces of the joint steel plate and the groove wall surface of the pre-construction diaphragm wall groove section, so that the defects of poor joint stability and poor anti-seepage effect in the prior art are overcome.

Inventors

KANG HONGYUAN
PANG JINZHONG
ZHANG YANG
Wu jiujiang
LI LEI
YANG LEI
Pan Sirui
HAN HAIQIANG
ZHENG ZHIBING
WANG ZILI

Assignees

浙江祯祥岩土工程有限公司

Dates

Publication Date: 20260505
Application Date: 20230213

Claims (8)

1. The auxiliary construction structure of the underground diaphragm wall is characterized by comprising a joint steel plate (3) for separating a first construction diaphragm wall groove section (1) and a second construction diaphragm wall groove section (2); joint pipes (4) detachably attached to both sides of the joint steel plate (3); the joint steel plates (3) comprise sealing plates (31) arranged on two sides, and the joint pipes (4) are arranged between the outer side surfaces of the sealing plates (31) and the groove wall surfaces of the prior-construction continuous wall groove section (1); The outer arc surface of the joint pipe (4) is attached to the outer side surface of the sealing plate (31), and the outer arc surface of the joint pipe (4) is attached to the wall surface of the groove section (1) of the first-construction continuous wall; The joint pipe (4) is disassembled after the concrete in the prior construction continuous wall groove section (1) is solidified, or the joint pipe (4) is disassembled after the post construction continuous wall groove section reinforcement cage (20) in the post construction continuous wall groove section (2) is hung; the joint pipe (4) is an elastic pipe, and a smooth metal disc is arranged on one side of the joint pipe (4) facing the first construction continuous wall groove section (1); the joint steel plate (3) further comprises a partition plate (32); The sealing plate (31) comprises a long plate (311) and a short plate (312); one end of the long plate (311) is rigidly connected with the partition plate (32), and the other end faces the first construction continuous wall groove section (1); one end of the short plate (312) is rigidly connected with the partition plate (32), and the other end faces the post-construction continuous wall groove section (2); the steel plate connecting device further comprises at least one connecting steel plate (5), wherein the connecting steel plate (5) is rigidly connected with the joint steel plate (3); One end of the connecting steel plate (5) facing the post-construction continuous wall groove section (2) is connected with a supporting plate (6), one side of the supporting plate (6) is provided with a detachable joint baffle (7), and the supporting plate (6) is attached to the joint baffle (7); The two sides of the joint baffle (7) are fixedly provided with side steel plates (8), and the outer side faces of the side steel plates (8) are tightly attached to the groove wall faces of the first-construction continuous wall groove section (1).
2. The underground diaphragm wall auxiliary construction structure according to claim 1, wherein the connecting steel plate (5) comprises a first steel plate (51) and a second steel plate (52); One end of the first steel plate (51) is rigidly connected with the joint steel plate (3), and the other end faces the first construction continuous wall groove section (1); One end of the second steel plate (52) is rigidly connected with the joint steel plate (3), and the other end faces the post-construction continuous wall groove section (2); the second steel plate (52) is fixedly connected with the supporting plate (6).
3. A method for constructing an underground diaphragm wall, characterized in that the construction step includes a method for performing auxiliary construction using an underground diaphragm wall auxiliary construction structure according to claim 1 or 2, comprising the steps of: The construction preparation step comprises the steps of designing the dimension of the continuous wall and the dimension of the auxiliary construction structure and manufacturing the auxiliary construction structure; Firstly constructing a continuous wall groove section (1), wherein the construction step comprises the steps of hoisting a joint steel plate (3) to one end of the firstly constructed continuous wall groove section (1), hoisting a joint pipe (4) between the outer side surface of a sealing plate (31) and the groove wall surface of the firstly constructed continuous wall groove section (1), enabling the joint pipe (4) to be attached to the outer side surface of the sealing plate (31) and the groove wall surface of the firstly constructed continuous wall groove section (1), and isolating the tail end of the firstly constructed continuous wall groove section (1) to prevent slurry from overflowing when pouring cement; And (3) a construction step of post-construction of the continuous wall groove section (2), wherein the construction step comprises the step of dismantling the joint pipe (4).
4. A method of constructing an underground diaphragm wall according to claim 3, wherein the step of constructing the diaphragm wall groove section (1) first comprises the step of supporting the joint steel plate (3) by using the connecting steel plate (5), the supporting plate (6) and the joint baffle (7), wherein both sides of the joint baffle (7) are attached to the groove wall surface of the diaphragm wall groove section (1) first through the side steel plates (8).
5. A diaphragm wall construction method according to claim 4, characterized in that in the supporting step, it comprises rigidly connecting the joint steel plate (3), the connecting steel plate (5), the support plate (6) into a rigid joint (J).
6. A method of constructing a diaphragm wall according to claim 4, wherein the post construction diaphragm wall channel section (2) comprises excavating a post construction diaphragm wall channel section (2) and removing the joint block (7).
7. The method for constructing the underground diaphragm wall according to claim 3, wherein the step of manufacturing the auxiliary construction structure comprises the steps of manufacturing a pre-construction diaphragm wall groove section steel reinforcement cage (10) and a post-construction diaphragm wall groove section steel reinforcement cage (20), wherein the method comprises the step of bending one end of the post-construction diaphragm wall groove section steel reinforcement cage (20) inwards to form a protruding end joint (201), and the protruding end joint (201) is arranged at one end close to the pre-construction diaphragm wall groove section steel reinforcement cage (10).
8. The method according to claim 7, wherein in the step of manufacturing the pre-construction continuous wall section reinforcement cage (10) and the post-construction continuous wall section reinforcement cage (20), the bottom ends of the longitudinal reinforcement bars of the pre-construction continuous wall section reinforcement cage (10) and the post-construction continuous wall section reinforcement cage (20) are bent inward.

Description

Underground diaphragm wall auxiliary construction structure and construction method Technical Field The invention relates to the technical field of geotechnical engineering, in particular to an underground continuous wall auxiliary construction structure and a construction method. Background Among the numerous building enclosures, the underground diaphragm wall is one of the most effective foundation pit supporting modes for supporting foundation pits, and is widely applied to underground engineering. The continuous wall construction process is quite complex, and in the construction process, indispensable construction joints exist in adjacent groove section units. In the process of applying the joint in engineering, the joint is easy to deform or shift due to the flowing of concrete, the problem of concrete leakage is further easily caused, the existing joint structure usually utilizes a leakage-proof iron sheet or curtain to prevent leakage, but the leakage-proof effect is poor, and the joint cannot be supported and protected, so that the improvement of the existing joint is worth researching. Disclosure of Invention The invention aims to overcome the defects of poor joint stability and poor anti-leakage effect in the prior art, thereby providing an auxiliary construction structure and a construction method of an underground diaphragm wall. In order to achieve the above purpose, the invention adopts the following technical scheme: The auxiliary construction structure of the underground diaphragm wall comprises joint steel plates for separating a first-construction diaphragm wall groove section and a second-construction diaphragm wall groove section, wherein each joint steel plate comprises sealing plates arranged on two sides, a joint pipe is arranged between the outer side face of each sealing plate and the groove wall face of the first-construction diaphragm wall groove section, the outer arc face of each joint pipe is attached to the outer side face of each sealing plate, and the outer arc face of each joint pipe is attached to the groove wall face of the first-construction diaphragm wall groove section. Preferably, the joint steel plate further comprises a separation plate, the sealing plate comprises a long plate and a short plate, one end of the long plate is rigidly connected with the separation plate, the other end of the long plate faces the pre-construction continuous wall groove section, one end of the short plate is rigidly connected with the separation plate, and the other end of the short plate faces the post-construction continuous wall groove section. The construction method comprises the steps of constructing a construction continuous wall groove section, connecting steel plates, supporting plates, detachable joint baffles, side steel plates and the like, wherein the connecting steel plates are rigidly connected with the connecting steel plates, one end of each connecting steel plate, facing the construction continuous wall groove section, is connected with the supporting plate, one side of each supporting plate is provided with the detachable joint baffle, the supporting plate is attached to each joint baffle, side steel plates are fixedly arranged on two sides of each joint baffle, and the outer side faces of the side steel plates are attached to the groove wall faces of the construction continuous wall groove section. The connecting steel plate comprises a first steel plate and a second steel plate, one end of the first steel plate is rigidly connected with the joint steel plate, the other end of the first steel plate faces the pre-construction continuous wall groove section, one end of the second steel plate is rigidly connected with the joint steel plate, the other end of the second steel plate faces the post-construction continuous wall groove section, and the second steel plate is fixedly connected with the supporting plate. The construction method of the underground diaphragm wall comprises the following steps of: The construction preparation step comprises the steps of designing the dimension of the continuous wall and the dimension of the auxiliary construction structure and manufacturing the auxiliary construction structure; the construction method comprises the steps of firstly constructing a continuous wall groove section, wherein the construction step comprises the steps of hoisting a joint steel plate to one end of the firstly constructed continuous wall groove section, hoisting a joint pipe between the outer side surface of a sealing plate and the groove wall surface of the firstly constructed continuous wall groove section, enabling the joint pipe to be attached to the outer side surface of the sealing plate and the groove wall surface of the firstly constructed continuous wall groove section, isolating the tail end of the firstly constructed continuous wall groove section, and preventing slurry from overflowing when cement is poured; And a construction step of post-constr