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CN-122013790-A - Adjustable force transmission structure of foundation pit assembled side wall and enclosure

CN122013790ACN 122013790 ACN122013790 ACN 122013790ACN-122013790-A

Abstract

The invention relates to the technical field of deep foundation pit support and assembly type underground structure construction, and discloses an adjustable force transmission structure of an assembly type side wall and a surrounding wall of a foundation pit. The invention solves the defect of traditional concrete backfill through an adjustable mechanical design, the screw transmission mechanism realizes wide-range stepless adjustment, perfectly adapts to the width deviation of a fertilizer groove, does not need on-site cutting or filling, can be synchronously installed along with a side wall as a prefabricated member, can quickly jack up by rotating a wrench after the middle plate is completed, thoroughly omits the waiting time of concrete pouring and maintenance, greatly improves the construction efficiency, and simultaneously ensures high bearing capacity and reliability of a rigid mechanical force transmission path, has no damage deformation in test, has simple structure, is only operated by a common wrench, and reduces the construction difficulty and cost.

Inventors

  • YANG JIE
  • ZHANG WENGANG
  • HU CHAO
  • XIONG ZHIMIN
  • ZHANG ZILONG
  • LI BIAO
  • ZENG ZIWEI
  • BAI JINZHOU
  • ZHANG BIN
  • Yan Juntuan

Assignees

  • 中铁八局集团有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. An adjustable force transmission structure of a foundation pit assembly type side wall and a surrounding is characterized by comprising a lower section structure formed by a bottom sealing plate (1) and a lower section sleeve (2), and an upper section structure formed by an upper section sleeve (3), a limiting screw rod (4) and a rotating handle (5).
  2. 2. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure according to claim 1, wherein the lower section sleeve (2) is fixedly arranged on the outer side of the bottom sealing plate (1), and the rotating handle (5) is arranged on the periphery of the upper section sleeve (3).
  3. 3. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure according to claim 2 is characterized in that the limit screw rod (4) is relatively fixed with the upper section sleeve (3), and the end part of the limit screw rod (4) is in threaded fit with the lower section sleeve (2).
  4. 4. The foundation pit assembled side wall and enclosure adjustable force transmission structure according to claim 3, wherein the outer side of the bottom sealing plate (1) is connected with a steel plate (6), and the steel plate (6) is used for being connected with a side wall (8).
  5. 5. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure of claim 4, wherein a steel enclosure purlin (7) is arranged on one side of the upper sleeve (3), and the steel enclosure purlin (7) is used for being abutted with the enclosure structure of the foundation pit.
  6. 6. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure according to claim 5, wherein the lower section sleeve (2) and the upper section sleeve (3) realize axial relative expansion and contraction through screwing in or screwing out of the limit screw rod (4), so that the force transmission distance between the bottom sealing plate (1) and the steel enclosure purlin (7) is adjusted.
  7. 7. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure according to claim 6, wherein the rotating handle (5) is used for driving the upper section sleeve (3) and the limiting screw rod (4) fixed with the upper section sleeve to synchronously rotate so as to realize telescopic adjustment.
  8. 8. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure according to claim 7, wherein the steel enclosure purlin (7) is abutted against the foundation pit enclosure structure, and the side wall (8) transmits lateral load to the adjustable force transmission structure through the steel plate (6) and the bottom sealing plate (1).
  9. 9. The adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure according to claim 8, wherein the limit screw rod (4) and the threads of the lower section sleeve (2) are matched to form a screw pair, and the rotary motion input by the rotary handle (5) is converted into linear motion between an upper section structure and a lower section structure.
  10. 10. The adjustable force transmission structure of the foundation pit assembled side wall and the enclosure according to claim 9 is characterized in that the rotating handle (5) and the limiting screw rod (4) are rotated to adjust the whole length, so that the side wall (8) is tightly propped against the enclosure.

Description

Adjustable force transmission structure of foundation pit assembled side wall and enclosure Technical Field The invention relates to the technical field of deep foundation pit support and assembly type underground structure construction, in particular to an adjustable force transmission structure of an assembly type side wall and a surrounding wall of a foundation pit. Background In deep foundation pit engineering, especially in subway stations, large underground spaces and other projects constructed by adopting an open excavation method or a cover excavation method, the conversion of a supporting system is a key link for ensuring the stability and the structural safety of a foundation pit. Wherein, the second steel support is basically consistent with the height of the plate in the permanent structure due to the design position, and plays an important role in balancing the lateral soil pressure of the foundation pit during the construction of the main structure. In order to achieve a smooth force transition from the temporary steel support to the permanent structure, the gap between the completed midplane structure and the foundation pit enclosure (e.g., underground diaphragm wall, row piles, etc.) must be effectively filled and held tight before the steel support is removed. This measure aims at transmitting the lateral pressure of the inward convergence of the foundation pit directly and reliably to the middle plate, and is borne by the permanent structural system, so as to ensure the overall stability and deformation control of the foundation pit after the support is removed. However, due to the fact that perpendicularity deviation, plane position deviation and construction error accumulation of the enclosure structure are difficult to avoid in the construction process, after the prefabricated assembly type side wall is installed, the width of a fertilizer groove formed between the back of the prefabricated assembly type side wall and the enclosure structure is not uniform, the situation that the local width is larger than or smaller than a design reserved value (such as 50 cm) often occurs, and great challenges are brought to traditional filling and jacking construction. Conventionally, the part is mostly backfilled by concrete, but the method has the defects of complex construction procedures, the construction organization is complex, the backfilling of fertilizer grooves with the height of 12m is needed for each time of assembling the 2m side wall, the assembling can be continued after the concrete reaches the design strength, the advantage of efficient construction of an assembled structure is severely restricted, the backfilling thickness is not flexibly adjustable, the adaptability is poor, and the problems of non-compact jacking, non-stressed and the like are easy to occur. Disclosure of Invention The invention is provided in view of the problems of the adjustable force transmission structure of the conventional foundation pit assembly type side wall and the enclosure. Therefore, the invention aims to provide an adjustable force transmission structure of a foundation pit assembled side wall and an enclosure, which aims to replace the traditional concrete backfill and realize an adjustable passive force transmission key device for rapidly propping up and transmitting force between the assembled side wall and the enclosure. In order to solve the technical problems, the invention provides the following technical scheme that the device comprises a lower section structure consisting of a bottom sealing plate and a lower section sleeve, and an upper section structure consisting of an upper section sleeve, a limiting screw rod and a rotating handle. As a preferable scheme of the adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure, the lower section sleeve is fixedly arranged on the outer side of the bottom sealing plate, and the rotating handle is arranged on the periphery of the upper section sleeve. As a preferable scheme of the adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure, the limit screw rod is relatively fixed with the upper section sleeve, and the end part of the limit screw rod is in threaded fit with the lower section sleeve. As a preferable scheme of the adjustable force transmission structure of the foundation pit assembly type side wall and the enclosure, the steel plate is connected to the outer side of the bottom sealing plate and is used for being connected with the side wall. As a preferable scheme of the adjustable force transfer structure of the foundation pit assembly type side wall and the enclosure, one side of the upper sleeve is provided with a steel enclosure purlin which is used for being abutted with the enclosure structure of the foundation pit. As a preferable scheme of the adjustable force transmission structure of the foundation pit assembly type side wall and the e