Semi-mechanical connection structure for assembled open caisson

Abstract

The utility model relates to the technical field of assembly type open caissons, in particular to a semi-mechanical connection structure for an assembly type open caisson, which comprises a blade foot with a welded steel plate, a first-layer prefabricated section and a plurality of second-layer prefabricated sections, and each section is made of light high-strength concrete materials. Connecting steel plates are arranged on the inner side face and the outer side face of the top of the blade foot, and the blade foot is connected with the first-layer prefabricated segment through the connecting steel plates and split bolts. The two adjacent second-layer prefabricated sections are also fixedly mounted through the deformed steel bars; each of the first-layer prefabricated section and the second-layer prefabricated section comprises a plurality of regular trapezoidal arc-shaped prefabricated sections and a plurality of inverted trapezoidal arc-shaped prefabricated sections which are alternately spliced to form a closed cylindrical component; arc-shaped mounting holes are formed in the four inner corners of each trapezoid arc-shaped prefabricated section, and the trapezoid arc-shaped prefabricated sections on the same layer penetrate through the arc-shaped mounting holes through curve connecting pieces so that the regular trapezoid prefabricated sections and the inverted trapezoid prefabricated sections can be connected in a fastened mode. The utility model has the advantages of leakproof leakproofness, convenience in transportation and installation, and simplicity, convenience and quickness in construction.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled caissons, in particular to a semi-mechanical connection structure for assembled caissons. Background Art

[0002] Traditional cast-in-place reinforced concrete construction involves numerous construction steps, a long construction period, and low economic benefits, while prefabricated reinforced concrete components have the advantages of a short construction period, low cost, and easy construction. With the rapid development of underground space construction, urban caissons are widely used in drainage tunnels, rail transit exhaust shafts, etc. In recent years, prefabricated and assembled caissons have become an option to solve the problems of traditional caisson construction. In existing technologies, the research and development of prefabricated and assembled caisson production processes ensures that the overall construction period will not be delayed due to steel frame welding and waiting for concrete strength during project construction. This can minimize the impact of construction on road traffic and residents' lives, and keep the construction site clean and orderly. However, in the existing technology, there is a problem that the cross-section of the entire raised part is small and it is easy to be damaged during transportation and installation; the elastic sealing gasket may affect the overall stability and there is a risk of water and soil leakage; a segment requires a combination of several pipe segments, and its longitudinal connection is prone to water seepage; the connection between the lower segment and the upper segment relies only on the weight of the upper segment and the tension of the wire rope, and there is a possibility of water seepage at the horizontal connection seam, and the integrity is not as good as that of a whole prefabricated pipe segment; therefore, there is an urgent need to improve the prefabricated and assembled caisson process to solve the above technical problems. Utility Model Content

[0003] In order to achieve the purpose of standardization and modularization of each layer of caisson, facilitate transportation and installation, simple and fast construction, and prevent water and soil leakage, the utility model proposes the following technical solutions:

[0004] A semi-mechanical connection structure for an assembled caisson, comprising a blade foot with a welded steel plate, a first-layer prefabricated segment, and a plurality of second-layer prefabricated segments, each layer of segments being made of lightweight high-strength concrete;

[0005] The top inner and outer sides of the blade foot are provided with connecting steel plates, and the blade foot is connected to the first layer prefabricated segment through the connecting steel plates and tension bolts. The first layer prefabricated segment and the second layer prefabricated segment are fixed together by threaded steel rods, and the two adjacent second layer prefabricated segments are also fixed together by threaded steel rods.

[0006] The first layer of prefabricated segments and the second layer of prefabricated segments each include a plurality of trapezoidal arc prefabricated segments, which are divided into regular trapezoidal arc prefabricated segments and inverted trapezoidal arc prefabricated segments. The regular trapezoidal arc prefabricated segments and the inverted trapezoidal arc prefabricated segments are alternately assembled to form a closed cylindrical component; a first limiting protrusion and a first limiting groove are respectively provided on the longitudinal sides of the trapezoidal arc prefabricated segments, for docking the regular trapezoidal arc prefabricated segments and the inverted trapezoidal arc prefabricated segments on the same layer;

[0007] Arc-shaped mounting holes are provided at the four inner corners of the trapezoidal arc prefabricated segments. The trapezoidal arc prefabricated segments on the same layer are fastened together with the inverted trapezoidal prefabricated segments by passing curved connectors through the arc-shaped mounting holes.

[0008] Furthermore, the curved connecting piece includes a curved bolt and a nut.

[0009] Furthermore, pipeline construction holes are provided on the first layer of prefabricated segments.

[0010] Furthermore, the top and bottom surfaces of the trapezoidal arc-shaped prefabricated segment are respectively pre-set with a second limiting protrusion and a second limiting groove, and a second limiting protrusion is also provided on the top surface of the blade foot. The blade foot and the first layer prefabricated segment, the first layer prefabricated segment and the second layer prefabricated segment, and the two adjacent second layer prefabricated segments are all positioned and connected by the second limiting protrusion and the second limiting groove.

[0011] Furthermore, threaded sleeves are provided on the top and bottom surfaces of the trapezoidal arc-shaped prefabricated segment, threaded steel rods are inserted into the threaded sleeves, and set bolts are engaged and fixed with the threaded steel rods.

[0012] This application has the following beneficial effects:

[0013] 1. Each layer segment is made of a new type of concrete material with low bulk density, high strength, good seismic performance, strong impact resistance and high bonding strength, and has the characteristics of light weight and high strength;

[0014] 2. The segment design is standardized and modular, with good production and assembly feasibility.

[0015] 3. No special machinery and materials are required during the construction process. The caisson sinks gradually under the weight of its own concrete, which simplifies the construction requirements.

[0016] 4. It has excellent waterproof effect and mechanical properties, is easy to transport and install, and the construction is simple and quick, which improves the overall benefit and construction efficiency of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 for Figure 1 A partial cross-sectional view of

[0019] Figure 3 Prefabricated segmental Figure 1 ;

[0020] Figure 4 Prefabricated segmental Figure 2 ;

[0021] Figure 5 Prefabricated segmental Figure 3 ;

[0022] Figure 6 This is a schematic diagram of prefabricated segment connectors;

[0023] Figure 7 Schematic diagram of threaded sleeve;

[0024] Figure 8 Schematic diagram of tension bolts;

[0025] Figure 9 Schematic diagram of threaded steel rod.

[0026] In the figure: 1-blade foot, 2-first layer prefabricated segment, 3-second layer prefabricated segment, 4-arc-shaped mounting hole, 501-first limiting groove, 502-first limiting protrusion, 6-waterstop tape, 701-second limiting groove, 702-second limiting protrusion, 81-welded steel plate, 82-connecting steel plate, 9-curved connector, 91-curved bolt, 92-nut, 10-threaded steel rod, 101-tightening bolt, 11-threaded sleeve, 12-tension bolt, 13-pipeline construction hole. DETAILED DESCRIPTION

[0027] The present application will be described in detail below with reference to the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present application. In addition, in the following description, descriptions of common structural and technical knowledge are omitted to avoid unnecessary confusion in the concepts of the present application.

[0028] Example: Combined with the Figure 1-9 , the present application provides a semi-mechanical connection structure for an assembled caisson, comprising a blade foot 1 with a welded steel plate 81, a first layer of prefabricated segments 2 and a plurality of second layer of prefabricated segments 3;

[0029] The top inner and outer sides of the blade foot 1 are provided with connecting steel plates 82, and the blade foot 1 is connected to the first layer prefabricated segment 2 through the connecting steel plates 82 and the tension bolts 12. The first layer prefabricated segment 2 and the second layer prefabricated segment 3 are fixed together by threaded steel rods 10, and the two adjacent second layer prefabricated segments 3 are also fixed together by threaded steel rods 10.

[0030] The first layer of prefabricated segments 2 and the second layer of prefabricated segments 3 each include a plurality of trapezoidal arc prefabricated segments, which are divided into regular trapezoidal arc prefabricated segments and inverted trapezoidal arc prefabricated segments. The regular trapezoidal arc prefabricated segments and inverted trapezoidal arc prefabricated segments are alternately assembled to form a closed cylindrical component; a first limiting protrusion 502 and a first limiting groove 501 are respectively provided on the longitudinal sides of the trapezoidal arc prefabricated segments, which are used for docking the regular trapezoidal arc prefabricated segments and the inverted trapezoidal arc prefabricated segments on the same layer;

[0031] Arc-shaped mounting holes 4 are provided at the four inner corners of the trapezoidal arc prefabricated segments. The trapezoidal arc prefabricated segments on the same layer are fastened together with the inverted trapezoidal prefabricated segments by passing curved connectors 9 through the arc-shaped mounting holes 4.

[0032] Furthermore, the curved connecting member 9 includes a curved bolt 91 and a nut 92 .

[0033] Furthermore, pipeline construction holes 13 are provided on the first layer of prefabricated segments 2 .

[0034] Furthermore, the top and bottom surfaces of the trapezoidal arc-shaped prefabricated segment are respectively pre-set with a second limiting protrusion 702 and a second limiting groove 701. A second limiting protrusion 702 is also provided on the top surface of the blade foot 1. The blade foot 1 and the first-layer prefabricated segment 2, the first-layer prefabricated segment 2 and the second-layer prefabricated segment 3, and the two adjacent second-layer prefabricated segments 3 are all positioned and connected in a corresponding manner through the second limiting protrusion 702 and the second limiting groove 701.

[0035] Furthermore, threaded sleeves 11 are provided on the top and bottom surfaces of the trapezoidal arc-shaped prefabricated segment, the threaded steel rod 10 is inserted into the threaded sleeve 11 , and the set bolts 101 are engaged and fixed with the threaded steel rod 10 .

[0036] Furthermore, water-stop tapes 6 are pre-embedded on the four outer edges of the trapezoidal arc-shaped prefabricated segment to prevent water leakage and seal.

[0037] When in use, it is first necessary to hoist the blade foot 1 with the welded steel plate 81 to the preset position, and then connect the first layer prefabricated segment 2 to the blade foot 1, and use the connecting steel plate 82 and the tension bolt 12 to perform a stable connection. The trapezoidal arc prefabricated segments of the same layer are fastened to the positive trapezoidal prefabricated segments and the inverted trapezoidal prefabricated segments through the curved connector 9 through the circular arc mounting hole 4, and the circular arc mounting hole 4 is grouting reinforced. Then, the first layer prefabricated segment 2 and the second layer prefabricated segment 3 are positioned and connected in a corresponding manner through the second limiting protrusion 702 and the second limiting groove 701. This not only accurately positions the prefabricated segments, but also effectively enhances the longitudinal connection stiffness between different layers. In addition, the threaded steel rod 10 needs to be inserted into the threaded sleeve 11, and then the fixing bolt 101 is fixed to the threaded steel rod 10 by a mechanical device, thereby further improving the longitudinal connection stiffness between different layers.

[0038] The specific implementation process steps of a semi-mechanical connection structure for an assembled caisson are as follows:

[0039] S1, prefabricate the various components of the caisson according to the actual project size and shape requirements, and all standard prefabricated reinforced concrete segments are of the same size and transported to the installation site;

[0040] S2, laying the concrete cushion of the caisson structure at the construction site. The size of the cushion is designed according to the required size of the caisson structure;

[0041] S3: After the blade foot 1 with the welded steel plate 81 is hoisted to the designed position, the soil is excavated and sunk. According to the design and construction requirements, the top surface of the blade foot 1 is slightly above the ground. The trapezoidal arc prefabricated segment of the first layer of prefabricated segments 2 is hoisted. The second limiting groove 701 of the trapezoidal arc prefabricated segment is aligned with the second limiting protrusion 702 on the top surface of the blade foot 1 with the steel plate 81.

[0042] S4, splicing and connecting several trapezoidal arc-shaped prefabricated segments to form the first layer of prefabricated segments 2; specifically, aligning the arc-shaped mounting holes 4 of adjacent trapezoidal arc-shaped prefabricated segments, and then horizontally connecting them using curved connectors 9, i.e., first inserting curved bolts 91 through the arc-shaped mounting holes 4, and after completely passing through two adjacent arc-shaped mounting holes 4, installing nuts 92 to secure, and then grouting and sealing the arc-shaped mounting holes 4;

[0043] S5, after the first layer of prefabricated segments 2 are installed, the connecting steel plate 82 is welded at the connection between the blade foot 1 and the first layer of prefabricated segments 2, and the tension bolts 12 are installed;

[0044] S6, dig and sink, and according to the design and construction requirements, make the top surface of the first layer prefabricated segment 2 slightly higher than the ground, install the threaded steel rod 10 in the threaded sleeve 11, then align the second limiting groove 701 of the trapezoidal arc prefabricated segment of the second layer prefabricated segment 3 with the second limiting protrusion 702 on the top surface of the first layer prefabricated segment 2, and align the threaded steel rod 10 in the first layer prefabricated segment 2 with the threaded sleeve 11 at the bottom of the second layer prefabricated segment 3, and slowly drop until the second layer prefabricated segment 3 is completely placed on the top surface of the first layer prefabricated segment 2;

[0045] S7, hoist the remaining second-layer prefabricated segments 3, excavate and sink them to the designed height;

[0046] S9, after the sinking is completed, the soil is backfilled, the bottom is sealed with plain concrete, the bottom of the steel plate is tied, and the concrete is weighted and sealed.

[0047] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Any changes or substitutions within the technical concepts disclosed in the present application and any changes or substitutions based on the technical solutions of the present application shall fall within the scope of protection of the present application.

Claims

1. A semi-mechanical connection structure for an assembled caisson, characterized by: It comprises a blade foot (1) with a welded steel plate (81), a first-layer prefabricated segment (2) and a plurality of second-layer prefabricated segments (3), each layer of segments being made of lightweight high-strength concrete material; The top inner and outer side surfaces of the blade foot (1) are provided with connecting steel plates (82), and the blade foot (1) is connected to the first layer prefabricated segment (2) through the connecting steel plates (82) and the tension bolts (12). The first layer prefabricated segment (2) and the second layer prefabricated segment (3) are fixed by threaded steel rods (10), and the two adjacent second layer prefabricated segments (3) are also fixed by threaded steel rods (10). The first layer of prefabricated segments (2) and the second layer of prefabricated segments (3) both include a plurality of trapezoidal arc prefabricated segments, the trapezoidal arc prefabricated segments are divided into regular trapezoidal arc prefabricated segments and inverted trapezoidal arc prefabricated segments, the regular trapezoidal arc prefabricated segments and inverted trapezoidal arc prefabricated segments are alternately assembled to form a closed cylindrical component; the longitudinal sides of the trapezoidal arc prefabricated segments are respectively provided with a first limiting protrusion (502) and a first limiting groove (501), which are used for docking the regular trapezoidal arc prefabricated segments and the inverted trapezoidal arc prefabricated segments on the same layer; Circular arc-shaped mounting holes (4) are provided at the four inner corners of the trapezoidal arc-shaped prefabricated segments, and the trapezoidal arc-shaped prefabricated segments on the same layer are fastened together by passing curved connecting pieces (9) through the circular arc-shaped mounting holes (4).

2. The semi-mechanical connection structure for an assembled caisson according to claim 1, characterized in that: The curved connecting piece (9) comprises a curved bolt (91) and a nut (92).

3. The semi-mechanical connection structure for an assembled caisson according to claim 2, characterized in that: The first layer of prefabricated segments (2) is provided with pipeline construction holes (13).

4. The semi-mechanical connection structure for an assembled caisson according to claim 3, characterized in that: The top and bottom surfaces of the trapezoidal arc-shaped prefabricated segments are respectively provided with a second limiting protrusion (702) and a second limiting groove (701). The top surface of the blade foot (1) is also provided with a second limiting protrusion (702). The blade foot (1) and the first layer prefabricated segment (2), the first layer prefabricated segment (2) and the second layer prefabricated segment (3), and two adjacent second layer prefabricated segments (3) are all positioned and connected in a corresponding manner through the second limiting protrusion (702) and the second limiting groove (701).

5. The semi-mechanical connection structure for an assembled caisson according to claim 4, characterized in that: The top and bottom surfaces of the prefabricated segment are provided with threaded sleeves (11), the threaded steel rod (10) is inserted into the threaded sleeves (11), and the fastening bolts (101) are engaged and fixed with the threaded steel rod (10).

6. The semi-mechanical connection structure for an assembled caisson according to claim 5, characterized in that: Water-stop tapes (6) are pre-embedded on the four outer edges of the trapezoidal arc-shaped prefabricated segment for leak-proof sealing.

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