Prefabricated assembly type prestress open caisson

Abstract

The utility model relates to a prefabricated assembly type prestress open caisson which comprises a plurality of layers of wall bodies, each layer of wall body comprises a plurality of prefabricated blocks, the cross section of each prefabricated block is in an L shape, horizontal prestress rib inserting grooves are formed in the top face and the bottom face of each prefabricated block, and vertical prestress rib inserting grooves are formed in the inner wall of each prefabricated block. Every two prefabricated blocks are combined into a hollow wall module with a rectangular section, the open caisson is formed by splicing a plurality of hollow wall modules layer by layer, the prefabricated blocks of each layer of wall are connected through horizontal prestressed tendons, and the multiple layers of walls are connected through vertical prestressed tendons. According to the utility model, each precast block is light in weight, so that hoisting construction is facilitated, and the use amount of concrete can be reduced; the precast blocks are connected through post-tensioning prestressed tendons, the bending resistance of the wall can be improved, and the construction method is particularly suitable for large rectangular open caisson construction.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and relates to the construction of a caisson as a bridge foundation, in particular to a prefabricated and assembled prestressed caisson. Background Technique

[0002] Caisson construction usually has in-situ casting method and prefabricated and assembled construction method. The in-situ casting method has a large amount of on-site concrete construction, a long construction period, difficult quality control, and a great impact on the surrounding environment. Therefore, the prefabricated and assembled construction method has become a development trend.

[0003] Patent CN210459257U discloses a prefabricated and assembled caisson, which divides the caisson wall into multiple segments, and each segment is further divided into multiple precast wall panels. When installing, multiple precast wall panels are assembled into a caisson segment and sunk in segments. Each of the above-mentioned precast wall panels is a solid structure and has a large weight, so a higher hoisting capacity of the crane is required during installation; in addition, the precast wall panels of the above-mentioned structure are connected by post-inserted steel bars, and the connection strength is low, and the bending resistance of the wall under the lateral extrusion of the soil body is weak. For large rectangular caissons, especially rectangular caissons, extremely high requirements are imposed on the lateral bending resistance of the wall, and the above-mentioned structure cannot meet the requirements. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems and provide a prefabricated and assembled prestressed caisson, the precast blocks of which are convenient for hoisting and installation, and are connected by post-tensioned prestressing tendons, and have good bending stress performance.

[0005] The technical solution of the utility model is as follows:

[0006] A prefabricated and assembled prestressed caisson, the caisson includes a plurality of rectangular caisson segments, and each caisson segment includes a plurality of precast blocks, and is characterized in that:

[0007] The cross-section of each precast block is L-shaped, including two mutually perpendicular wall panels. One end of the two wall panels is cast integrally, and the end faces of the other ends of the two wall panels are both inclined planes. Two convex blocks are provided on the inclined end face of one wall panel, and two grooves matching the convex blocks are provided on the inclined end face of the other wall panel. A vertical prestressing tendon slot is provided on the inner wall surface of each wall panel; the plurality of precast blocks are divided into type A precast blocks and type B precast blocks. Among them, horizontal prestressing tendon slots are provided on the top surface and the bottom surface of one wall panel of the type A precast block, and horizontal prestressing tendon slots are provided on the top surface and the bottom surface of the two wall panels of the type B precast block;

[0008] The inclined end faces of two precast blocks of type A are butted against each other, and the convex blocks on the inclined end face of one precast block are inserted into the grooves on the inclined end face of the other precast block to form a caisson side wall module with a rectangular cross-section; the inclined end faces of two precast blocks of type B are butted against each other, and the convex blocks on the inclined end face of one precast block are inserted into the grooves on the inclined end face of the other precast block to form a caisson corner module with a rectangular cross-section; a hollow groove running through the upper and lower parts is formed at the center of both the caisson side wall module and the caisson corner module.

[0009] One corner module is installed at each of the four corners of each caisson segment, and the four side walls are each composed of multiple side wall modules. Horizontal prestressed tendons are inserted into the horizontal prestressed tendon slots on the top and bottom surfaces of each precast block along the longitudinal direction of each side wall, and both ends of each horizontal prestressed tendon are respectively anchored outside the two corner modules.

[0010] Multiple caisson segments are butted against each other vertically, and vertical prestressed tendons are inserted into the vertical prestressed tendon slots on the precast blocks that are opposite to each other vertically. Both ends of each vertical prestressed tendon are respectively anchored at the top and bottom of the caisson.

[0011] The utility model uses two L-shaped precast blocks to form a hollow caisson wall module. Multiple hollow wall modules are assembled to form the caisson wall structure. Each precast block has a relatively small weight, which is convenient for hoisting construction and can reduce the amount of concrete used; the precast blocks are connected by post-tensioned prestressed tendons, which can improve the bending resistance of the wall and is especially suitable for the construction of large rectangular caissons. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the utility model;

[0013] Figure 2 is a schematic structural diagram of a precast block of type A of the utility model;

[0014] Figure 3 is a schematic structural diagram of a caisson side wall module formed by combining two precast blocks of type A;

[0015] Figure 4 is a schematic structural diagram of a precast block of type B;

[0016] Figure 5 is a schematic structural diagram of a caisson corner module formed by combining two precast blocks of type B;

[0017] Figure 6 is a schematic structural diagram of a caisson segment formed by combining multiple precast blocks;

[0018] Figure 7 is Figure 6 the partial enlarged view in Detailed Embodiment

[0019] As Figure 1As shown in the figure, a prefabricated prestressed open caisson is divided into multiple rectangular caisson segments, and each caisson segment includes multiple precast blocks 1;

[0020] As Figure 2 , Figure 4 shown in the figure, the cross-section of each precast block 1 is L-shaped, including two wall pieces 11 perpendicular to each other. One end of the two wall pieces is cast integrally, and the end faces of the other ends of the two wall pieces are both inclined planes. Two convex blocks 12 are provided on the inclined end face of one wall piece, and two grooves 13 matching the convex blocks are provided on the inclined end face of the other wall piece. A vertical prestressed tendon slot 14 is provided on the inner wall surface of each wall piece; The multiple precast blocks are divided into type A precast blocks and type B precast blocks. Among them, horizontal prestressed tendon slots 15 are provided on the top and bottom surfaces of one wall piece 11 of the type A precast block, and horizontal prestressed tendon slots 15 are provided on the top and bottom surfaces of the two wall pieces of the type B precast block;

[0021] As Figure 3 , Figure 5 shown in the figure, the inclined end faces of two type A precast blocks 1 are buckled, and the convex blocks on the inclined end face of one precast block are inserted into the grooves on the inclined end face of the other precast block to form a caisson side wall module with a rectangular cross-section; The inclined end faces of two type B precast blocks 1 are buckled, and the convex blocks on the inclined end face of one precast block are inserted into the grooves on the inclined end face of the other precast block to form a caisson corner module with a rectangular cross-section; A hollow groove 2 that penetrates up and down is formed at the center of the caisson side wall module and the caisson corner module;

[0022] As Figure 6 shown in the figure, one corner module is installed at each of the four corners of each caisson segment, and the 4 side walls are each composed of multiple side wall modules. Horizontal prestressed tendons 3 are inserted into the horizontal prestressed tendon slots 15 on the top and bottom surfaces of each precast block along the longitudinal direction of each side wall, and both ends of each horizontal prestressed tendon 3 are respectively anchored outside the two corner modules;

[0023] As Figure 1 shown in the figure, the multiple caisson segments are docked up and down, and vertical prestressed tendons 4 are inserted into the vertical prestressed tendon slots 14 on the precast blocks that are opposite up and down. Both ends of each vertical prestressed tendon are respectively anchored at the top and bottom of the caisson.

[0024] The construction method of the present utility model is as follows:

[0025] Excavate the caisson foundation pit, install the caisson cutting edge section in the foundation pit, and then assemble a layer of caisson sections with precast blocks on the cutting edge section. After the assembly is completed, insert horizontal prestressed tendons into the horizontal prestressed tendon slots on the top and bottom surfaces of the precast blocks along the four longitudinal side walls of the caisson. After tensioning the horizontal prestressed tendons, anchor them at both ends, and pour mortar into the horizontal prestressed tendon slots to integrate the horizontal prestressed tendons with the precast block concrete; insert vertical prestressed tendons into the vertical prestressed tendon slots of each precast block, and anchor the lower ends of the vertical prestressed tendons to the cutting edge; excavate the soil in the caisson foundation pit to sink the caisson by one layer.

[0026] Assemble the subsequent caisson sections in sequence according to the above method, assemble one layer and sink one layer; after the caisson is constructed to the design depth, tension each vertical prestressed tendon and anchor the upper end to the top surface of the immersed side wall. To increase the section modulus of the caisson wall, cement mortar or rubble concrete can be filled in the hollow grooves 2 of each caisson side wall module and caisson corner module.

Claims

1. A prefabricated prestressed caisson, the caisson comprising a plurality of rectangular caisson segments, each caisson segment comprising a plurality of prefabricated blocks, characterized in that: Each prefabricated block has an L-shaped cross section, including two mutually perpendicular wall pieces, one end of the two wall pieces are cast as one body, and the end faces of the other ends of the two wall pieces are both inclined faces, one of the inclined end faces of the wall pieces is provided with two protrusions, and the other inclined end face of the wall piece is provided with two grooves matching the protrusions, and a vertical prestressed tendon slot is provided on the inner wall surface of each wall piece; the multiple prefabricated blocks are divided into A-type prefabricated blocks and B-type prefabricated blocks, wherein the top and bottom surfaces of a wall piece of the A-type prefabricated block are respectively provided with horizontal prestressed tendon slots, and the top and bottom surfaces of the two wall pieces of the B-type prefabricated block are both provided with horizontal prestressed tendon slots; The oblique end faces of two A-type prefabricated blocks are buckled, and the protrusion on the oblique end face of one prefabricated block is inserted into the groove on the oblique end face of the other prefabricated block, forming a caisson side wall module with a rectangular cross-section; the oblique end faces of two B-type prefabricated blocks are buckled, and the protrusion on the oblique end face of one prefabricated block is inserted into the groove on the oblique end face of the other prefabricated block, forming a caisson corner module with a rectangular cross-section; the centers of the caisson side wall module and the caisson corner module both form a hollow groove that runs through from top to bottom; A corner module is installed at each of the four corners of each caisson segment. The four side walls are composed of multiple side wall modules. Horizontal prestressed tendons are inserted into the horizontal prestressed tendon slots on the top and bottom surfaces of each prefabricated block along the longitudinal direction of each side wall. Both ends of each horizontal prestressed tendon are anchored on the outside of the two corner modules. The multi-layer caisson segments are butt-jointed up and down, and vertical prestressed tendons are inserted into the vertical prestressed tendon slots on the upper and lower opposite prefabricated blocks. Both ends of each vertical prestressed tendon are anchored at the top and bottom of the caisson respectively.

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