CN-121992809-A - Cast-in-situ open caisson template supporting structure and construction method thereof

CN121992809ACN 121992809 ACN121992809 ACN 121992809ACN-121992809-A

Abstract

The invention relates to a cast-in-situ open caisson formwork support structure and a construction method thereof, wherein the structure comprises a lower section of well wall, a reinforcing mesh and a plurality of embedded support ribs arranged along the circumferential direction of the lower section of well wall, the reinforcing mesh is embedded in the lower section of well wall, and part of the reinforcing mesh extends out of the top surface of the lower section of well wall and is positioned between two side formwork units; the embedded support bars are embedded in the lower section well wall, part of the embedded support bars extend out of the side face of the lower section well wall, template units which are arranged on two opposite sides of the lower section well wall along the circumferential direction of the lower section well wall and are erected on the part of the embedded support bars extending out of the lower section well wall, a plurality of first drawknot pieces for drawknot the bottoms of the template units and the reinforcing steel bar net, and a plurality of second drawknot pieces for drawknot the tops of the two template units which are symmetrically arranged. The existing reinforcing mesh in the open caisson structure is fully utilized as a drawknot anchoring point and the embedded supporting ribs are used as the bottom support of the template unit, the bottom and the top of the template unit are respectively restrained by the first drawknot piece and the second drawknot piece, a stable support system is formed, the structure is simple, the installation is quick, and the construction cost is low.

Inventors

CHEN HANPEI
XIE HAIPENG
Zhan Guofu
Weng Sida
ZHANG XUDONG
Zheng Siqia
LIN JUNLIANG
LUO WEIHANG
WANG LEI

Assignees

广东省建筑工程机械施工有限公司

Dates

Publication Date: 20260508
Application Date: 20260402

Claims (10)

1. The cast-in-situ open caisson template supporting structure comprises a lower section of well wall (01), and is characterized by further comprising: The steel bar net (1) and a plurality of embedded supporting ribs (2) are circumferentially arranged along the lower section well wall (01), and the steel bar net (1) is embedded in the lower section well wall (01) and partially extends out of the top surface of the lower section well wall (01), and each embedded supporting rib (2) is embedded in the lower section well wall (01) and partially extends out of the side surface of the lower section well wall (01); The template units (3) are arranged on two opposite sides of the lower section of the well wall (01) along the circumferential direction of the lower section of the well wall, and are erected on the parts, extending out of the lower section of the well wall (01), of the embedded support ribs (2), wherein the reinforcing mesh (1) is positioned between the template units (3) on two sides; The device comprises a plurality of first drawknot members (4) and a plurality of second drawknot members (5), wherein each first drawknot member (4) is used for drawknot the bottoms of the template units (3) and the reinforcing mesh (1), and each second drawknot member (5) is used for drawknot the tops of two symmetrically arranged template units (3).
2. The cast-in-situ open caisson formwork support structure according to claim 1, wherein the formwork unit (3) comprises a formwork (31) and a plurality of battens (32), the formwork (31) is arranged on two opposite sides of the lower-section well wall (01) along the circumferential direction of the lower-section well wall, each batten (32) is arranged on one side, far away from the reinforcing steel bar net (1), of the formwork (31), each first drawknot piece (4) is used for connecting the bottom end of each batten (32) with the reinforcing steel bar net (1), and each second drawknot piece (5) is used for connecting the tops of the battens (32) on two opposite sides of the lower-section well wall (01).
3. A cast-in-situ open caisson formwork support structure as claimed in claim 2, characterized in that each first drawknot member (4) is an iron wire which is wound around the reinforcing mesh (1) and the batten (32) and then bound to the batten (32).
4. A cast-in-place open caisson formwork support structure as claimed in claim 3, wherein the iron wire is number 22 iron wire.
5. A cast-in-situ caisson formwork support structure as claimed in claim 2, characterized in that a plurality of said battens (32) are evenly spaced along the length of said formwork (31).
6. A cast-in-situ caisson formwork support structure as claimed in claim 5, characterized in that the spacing between two adjacent battens (32) is 400mm.
7. The cast-in-situ open caisson formwork support structure according to claim 2, wherein the second drawknot piece (5) comprises a hook-shaped clamping rod (51) and a movable clamping head (52), a bending section (511) of the hook-shaped clamping rod (51) is hooked on the top of a batten (32) on one side of the steel bar net (1), and the movable clamping head (52) is installed at one end, far away from the bending section (511), of the hook-shaped clamping rod (51) and abuts against the batten (32) on the other side of the steel bar net (1).
8. A cast-in-situ open caisson formwork support structure as claimed in claim 1, characterized in that the pre-buried support ribs (2) are "L" -shaped.
9. The cast-in-situ open caisson formwork support structure as claimed in claim 1 or 8, wherein the pre-buried support ribs (2) are uniformly buried in the lower section of the well wall (01) at intervals.
10. A construction method based on the cast-in-situ open caisson formwork support structure as claimed in any one of claims 1 to 9, characterized in that the formwork unit (3) comprises a formwork (31) and a plurality of battens (32), wherein the formwork (31) is arranged on two opposite sides of the lower section of the well wall (01) along the circumferential direction thereof, and each batten (32) is arranged on one side of the formwork (31) far away from the reinforcing mesh (1); The method comprises the following steps: The method comprises the steps of firstly, pre-burying the pre-buried support ribs (2) on the inner side and the outer side of the top of a lower section well wall (01) before pouring the lower section well wall (01) to serve as bottom support points of a template (31) of an upper sunk well wall structure, wherein the pre-buried support ribs (2) are made into an L shape, the short sides of the pre-buried support ribs are anchored into concrete, and the long sides of the pre-buried support ribs horizontally extend out of the side surface of the lower section well wall (01); binding a reinforcing mesh (1) of an upper open caisson wall structure on the top of the lower section of the well wall (01), and positioning a first drawknot member (4) on the top of the lower section of the well wall (01) by using the reinforcing mesh (1) in advance; Thirdly, installing the templates (31) on the inner side and the outer side of the top of the lower section well wall (01), wherein the short sides of the templates (31) are vertically arranged, and the long sides of the templates are horizontally arranged; the method comprises the steps of installing battens (32) at intervals of 400mm on one side of a template (31) away from a reinforcing mesh (1), binding and fixing bottoms of the battens (32) on two opposite sides of a lower section well wall (01) on the reinforcing mesh (1) by using a first preset drawknot piece (4) so that the battens (32) are abutted against the template (31), and locking tops of the battens (32) on two opposite sides of the lower section well wall (01) by using a second drawknot piece (5); Fourthly, sealing a small gap between the template (31) and the lower section well wall (01) by adopting building sealant at the bottom of the template (31) to prevent concrete from leaking during pouring; And fifthly, pouring the wall structure of the upper open caisson, wherein concrete is uniformly poured in layers during pouring, the thickness of each layer of concrete is 30 cm-40 cm, the upper layer of concrete is poured before the lower layer of concrete is initially set, and each layer of concrete is immediately compacted by vibrating a vibrating rod after the concrete is poured.

Description

Cast-in-situ open caisson template supporting structure and construction method thereof Technical Field The specification relates to the technical field of building construction, in particular to a cast-in-situ open caisson formwork support structure and a construction method thereof. Background The open caisson is a reinforced concrete underground structure, the cast-in-situ open caisson is manufactured on the ground in a segmented manner and is submerged in a segmented manner, the construction flow of each segment of structure is steel bar binding, template installation and fixation, concrete pouring maintenance, the bottom of the well is dug after pouring to a certain height, the open caisson is submerged by utilizing the self weight of the structure, then the open caisson is connected with the reinforced concrete structure, then the open caisson is dug to be submerged, and the circulation is repeated until the open caisson is submerged to the designed elevation. The cast-in-situ open caisson is cast with concrete at a distance of more than 50cm from the ground, and a template with a certain thickness and a certain height is required to be used for casting the concrete, and as the top of the cast-in-situ open caisson is generally higher than the ground by more than 50cm, the bottom of the template is not provided with a fulcrum when the upper well wall is cast by high connection, and therefore, the construction of a template support reinforcing system is a key for cast-in-situ open caisson casting formation. The existing open caisson, shear wall, retaining wall, pool wall, well wall and other concrete pouring formwork supports usually adopt a screw rod method, namely, opposite-pull screws are adopted to tighten and fix inner and outer side formworks, and vertical battens and transverse steel pipe supporting frameworks are arranged on the outer sides of the formworks on two sides of the structural wall to form a formwork supporting and reinforcing system for concrete pouring. Disclosure of Invention The specification provides a cast-in-situ open caisson formwork support structure and a construction method thereof, which solve the problems of long construction period and high cost of a concrete pouring formwork support structure in the prior art. The technical scheme adopted in the specification is as follows: The cast-in-situ open caisson formwork support structure comprises a lower section well wall, a reinforcing mesh, a plurality of embedded support ribs, a plurality of first drawknot members and a plurality of second drawknot members, wherein the embedded support ribs are arranged along the circumferential direction of the lower section well wall, the reinforcing mesh is embedded in the lower section well wall and partially extends out of the top surface of the lower section well wall, each embedded support rib is embedded in the lower section well wall and partially extends out of the side surface of the lower section well wall, the formwork units are arranged on two opposite sides of the lower section well wall along the circumferential direction of the lower section well wall and are erected on the portions, extending out of the lower section well wall, of the embedded support ribs, the reinforcing mesh is located between the formwork units on two sides, the first drawknot members are used for drawknot the bottoms of the formwork units and the reinforcing mesh, and the second drawknot members are used for drawknot the tops of the two formwork units symmetrically arranged. According to the technical means, the supporting structure fully utilizes the existing reinforcing mesh in the open caisson structure as the drawknot anchoring point, utilizes the embedded supporting ribs as the bottom support of the template unit, and simultaneously utilizes the first drawknot piece and the second drawknot piece to respectively restrict the bottom and the top of the template unit to form a stable supporting system. The template unit comprises a template and a plurality of battens, wherein the template is arranged on two opposite sides of the lower section of well wall along the circumferential direction of the lower section of well wall, each batten is arranged on one side of the template far away from the reinforcing mesh, each first drawknot piece is used for connecting the bottom end of each batten with the reinforcing mesh, and each second drawknot piece is used for connecting the tops of the battens on two opposite sides of the lower section of well wall. According to the technical means, the stressed area of the template is increased by the battens, so that the tie force of the first tie piece and the second tie piece is uniformly transmitted to the surface of the template, the local damage to the template caused by the direct action of the first tie piece and the second tie piece on the template is avoided, the service life of the template is prolonged, and meanwhile, the battens are common building materi