CN-121976520-A - Telescopic joint device for underground diaphragm wall and underground diaphragm wall construction method

CN121976520ACN 121976520 ACN121976520 ACN 121976520ACN-121976520-A

Abstract

The invention relates to the technical field of building construction, and discloses a telescopic joint device for an underground diaphragm wall and an underground diaphragm wall construction method. According to the invention, the telescopic connecting piece is actively inserted into the adjacent reinforcement cages after energy release and expansion, and after concrete pouring, a connecting path is established between the two reinforcement cages, so that shearing force, tensile force and even part of bending moment can be transmitted through the reinforcement materials, the actual bearing of the joint is reduced, and the problem that the joint restricts the overall working performance due to dependence on a concrete weak link is solved. Meanwhile, the telescopic connecting piece forms mechanical anchoring or jogging after stretching, so that the reinforcement cage of the adjacent groove sections forms a continuous or semi-continuous stressed whole at the joint part, the whole cooperative deformability of the underground diaphragm wall under the action of deep and large foundation pits and complex external loads (such as soil pressure, water pressure and unbalanced load) is improved, the stress concentration phenomenon caused by relative sliding or expanding of the joints is reduced, and the safety redundancy and durability of the structure are improved.

Inventors

ZHANG YUE
WANG CHANGJIANG
WANG XIAOYANG
BAI YUDONG

Assignees

浙江数智交院科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260119

Claims (10)

1. A telescopic joint apparatus for an underground diaphragm wall, comprising: the joint main body (1) is fixedly arranged on the advanced reinforcement cage (A); The telescopic connecting piece (2) is arranged on the joint main body (1), and the telescopic connecting piece (2) can be converted between an energy storage compression state and an energy release expansion state along the axial direction of the telescopic connecting piece (2), and in the energy storage compression state, the telescopic connecting piece (2) is retracted, and in the energy release expansion state, the telescopic connecting piece (2) is expanded and is used for being inserted into an adjacent post-construction steel reinforcement cage (B); The energy storage device comprises a connector body (1), a limiting piece (3), a telescopic connecting piece (2) and an energy storage compression state, wherein the limiting piece (3) is detachably connected with the connector body (1), the telescopic connecting piece (2) is restrained and kept in the energy storage compression state when the limiting piece (3) is connected with the connector body (1), and the telescopic connecting piece (2) can be converted into the energy release expansion state when the limiting piece (3) is detached from the connector body (1).
2. Telescopic joint apparatus for underground diaphragm wall according to claim 1, wherein the telescopic connection (2) comprises: An outer sleeve (21) provided with a movable cavity extending along the axial direction, wherein one axial end is an open end, and the other axial end is a closed end; A rod body (22) movably mounted to the outer sleeve (21), the rod body (22) including an inner end (221) located within the movable chamber and an outer end (222) extending beyond the open end; The elastic element (23) is arranged in the movable cavity, and two ends which are elastically deformed respectively act on the closed end of the outer sleeve (21) and the inner end (221) of the rod body (22), the elastic element (23) is configured to enable the rod body (22) to compress the elastic element (23) and move inwards to a compressed position when the rod body (22) is acted by acting force towards the inner part of the outer sleeve (21), and enable the elastic element (23) to push the rod body (22) to move outwards to an extending position when the acting force is removed.
3. A telescopic joint apparatus for a diaphragm wall according to claim 2, wherein, The outer sleeve (21) is a conical sleeve; the section of the rod body (22) matched with the outer sleeve (21) is a corresponding conical rod section; when the rod body (22) is in the extending position, the conical rod section is tightly attached to the inner wall surface of the conical sleeve to form wedge-shaped self-locking.
4. Telescopic joint apparatus for underground diaphragm wall according to claim 2, characterized in that the joint body (1) is provided with a through hole (101); the open end of the outer sleeve (21) is arranged on the through hole (101); the outer end (222) of the rod body (22) penetrates through the through hole (101).
5. The telescopic joint apparatus for underground diaphragm wall according to claim 4, wherein the telescopic link (2) further comprises: the stop piece (4), the stop piece (4) is installed in the outer end (222) of the body of rod (22), the first length and/or the second length of stop piece (4) is greater than the aperture of through-hole (101).
6. Telescopic joint apparatus for underground diaphragm wall according to any of claims 1-5, characterized in that the stop (3) is detachably connected with the joint body (1) by means of a locking structure; the locking structure comprises a C-shaped clamping groove (301) arranged at the edge of the limiting piece (3) and a flange (102) which is arranged on the joint main body (1) and matched with the C-shaped clamping groove (301).
7. A telescopic joint apparatus for a diaphragm wall according to claim 6, wherein, Two C-shaped clamping grooves (301) are formed at intervals; the flanges (102) are in one-to-one correspondence with the C-shaped clamping grooves (301).
8. A telescopic joint apparatus for a diaphragm wall according to any of claims 1 to 5, The connector body (1) is H-shaped steel, and the telescopic connecting piece (2) penetrates through and is fixed on a web plate (105) of the H-shaped steel.
9. A telescopic joint apparatus for a diaphragm wall according to any of claims 2 to 5, The elastic element (23) is a cylindrical helical spring.
10. A method of constructing an underground diaphragm wall using the expansion joint device for an underground diaphragm wall according to any one of claims 1 to 9, comprising the steps of: S1, arranging a telescopic joint device for an underground continuous wall at the end part of a prior reinforcement cage (A), and connecting a limiting piece (3) to a joint main body (1) so that all telescopic connecting pieces (2) are restrained and kept in an energy storage compression state; S2, lowering the advanced steel reinforcement cage (A) provided with the joint device into the groove section, and pouring concrete to form an advanced underground continuous wall; s3, excavating adjacent post-construction width groove sections, and lowering post-construction width reinforcement cages (B) into the groove sections; S4, removing the limiting piece (3) from the joint main body (1); S5, each telescopic connecting piece (2) is converted from an energy storage compression state to an energy release expansion state, and the outer end (222) of the rod body (22) extends out and is inserted into a mesh gap or a space of a construction web reinforcement cage (B); And S6, pouring concrete in the post-construction width groove section, and anchoring the telescopic connecting piece (2) in the post-construction width concrete after the concrete is solidified to finish rigid connection between the two underground continuous walls.

Description

Telescopic joint device for underground diaphragm wall and underground diaphragm wall construction method Technical Field The invention relates to the technical field of building construction, in particular to a telescopic joint device for an underground diaphragm wall and an underground diaphragm wall construction method. Background The underground continuous wall is a structure of continuous underground wall with soil retaining or bearing function, which is formed by carrying out deep trench excavation in a stratum in a framing way, then lowering a reinforcement cage in a trench section and pouring concrete. The underground diaphragm wall is widely applied to engineering such as deep foundation pit support and permanent underground structure. In recent years, underground continuous walls are increasingly used in the fields of bridge foundations and suspension bridge anchorage. Joints between adjacent webs in a diaphragm wall are structural weaknesses. Has obvious influence on the integral deformation and stress of the structure. In the engineering of a deep and large foundation pit and a permanent structure for bearing complex loads, the defect of the bearing capacity of a joint has become a key factor for restricting the integral working performance and safety redundancy of the underground diaphragm wall. At present, the common underground diaphragm wall joint form in engineering mainly comprises a locking port pipe joint, an H-shaped steel joint and a cross steel plate joint. When the lock catch pipe joint is arranged, two ends of a steel reinforcement cage of the preceding groove section are vertically provided with steel pipes (locking pipes) with the diameters slightly smaller than the wall thickness, after concrete is poured, the locking pipes are gradually pulled out before initial setting of the concrete, so that a semicircular concrete exposed surface is formed at the end of the groove section, the concrete of the later construction groove section is directly wrapped and solidified on the semicircular end surface of the former construction groove section to form joggles, and partial horizontal force is transferred by means of the meshing effect between the concrete. When the H-shaped steel joint or the cross steel plate joint is arranged, H-shaped or cross steel plate joint boxes are arranged at two ends, after concrete is poured, the joint boxes are pulled out, a cavity is left, a groove-carrying end is formed, a post-pouring groove section steel reinforcement cage is matched with a preceding groove section steel reinforcement cage end, a groove is embedded in construction, and the joint provides better shearing resistance than a fore shaft pipe through the combination of the steel plate and the concrete. However, in the practical application process, the fact that the reinforcement cages of the underground continuous wall are independent of each other can be found out when the joint is used, and load cannot be fully transmitted between adjacent reinforcement cages, so that the bearing capacity of the joint mainly depends on the local shearing resistance and tensile strength of concrete, the mechanical properties of the reinforcement materials cannot be fully exerted, the joint becomes a weak link of an integral structure, and the safety redundancy and the working performance of the underground continuous wall under deep and complex load working conditions are restricted. Disclosure of Invention The invention provides a telescopic joint device for an underground diaphragm wall and an underground diaphragm wall construction method, which aim to solve the problems that the joint becomes a weak link of an integral structure and restricts the safety redundancy and the working performance of the underground diaphragm wall under deep and large and complex load working conditions because the steel reinforcement cages are mutually independent when the traditional underground diaphragm wall joint is adopted. In a first aspect, the invention provides a telescopic joint apparatus for an underground diaphragm wall, comprising a joint body, at least one telescopic connecting member and a limiting member. The connector body is fixedly arranged on a preceding reinforcement cage, at least one telescopic connecting piece is arranged on the connector body and can be switched between an energy storage compression state and an energy release expansion state along the axial direction of the telescopic connecting piece, the telescopic connecting piece is retracted in the energy storage compression state, the telescopic connecting piece is expanded in the energy release expansion state and is used for being inserted into an adjacent post construction reinforcement cage, the limiting piece is detachably connected with the connector body, the telescopic connecting piece is restrained and kept in the energy storage compression state when the limiting piece is connected with the connector body, and the telescopic connecti