Assembly type fragmented bent cap connecting structure

Abstract

The utility model discloses an assembly type fragment bent cap connecting structure which comprises at least two fragments. During construction, all the fragments are sequentially erected in the width direction; in every two adjacent sub-sheets, one sub-sheet which is erected firstly is connected with the other sub-sheet which is erected later through a hinge joint structure located at the upper end of the connecting surface; each hinge joint structure comprises a first notch, a plurality of short U-shaped steel bars, a second notch, a plurality of long U-shaped steel bars and a high-strength and high-toughness concrete material; the two straight ends of each long U-shaped steel bar are parallel to the width direction of the bent cap and embedded in the corresponding fragments, and the arc-shaped ends of the long U-shaped steel bars extend into the range of the corresponding first notches to be in lap joint with the arc-shaped ends of the short U-shaped steel bars at the corresponding positions. When all the fragments are erected, the long U-shaped steel bars and the short U-shaped steel bars are aligned and in lap joint, and finally high-strength and high-toughness concrete materials are poured. According to the utility model, the weight of the cap beam prefabricated segment can be greatly reduced, and the transportation and hoisting difficulty is obviously reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cap beam construction, in particular to an assembled segmented cap beam connection structure. Background Art

[0002] Prefabricated bridge technology is the development direction of the transformation and upgrading of bridge construction technology.

[0003] With the development of technology and the requirements for construction deadlines, the technology of fully prefabricated and assembled bridges has matured and been widely used in superstructures. However, the problem of assembly of bridge cap beams has not been solved. The main reason is that the weight of the cap beam made of traditional concrete is 200 to 400 tons, which is inconvenient to transport and difficult to install. Cast-in-place construction seriously affects the traffic on existing roads. Therefore, the cap beam has become the main technical bottleneck in the development of assembled bridges.

[0004] There are generally two ideas for lightweighting existing prefabricated cap beams:

[0005] One is to "break the whole into parts". While ensuring that the total weight of the cap beam remains unchanged, the solid cap beam is constructed in sections along the length direction. This will reduce the weight during transportation and assembly and facilitate construction. Finally, the various parts are spliced ​​together as a whole using wet joints or prestressed tendons to bear external loads together.

[0006] However, the prefabrication and splicing method of the cap beam segments generally adopts the method of inserting pin steel bars into deep hinged joints or U-shaped steel bars, which has problems such as large amount of concrete pouring on site and difficulty in reinforcing bars.

[0007] The other is "hollow high-strength", which is to groove or hollow out the solid cap beam into a thin-wall design. For example, the cap beam cross-section is designed to be U-shaped or box-shaped. In order to compensate for the reduction in bearing capacity caused by hollowing, high-strength concrete or UHPC concrete is used for the concrete of the cap beam to achieve the purpose of reducing the weight of the cap beam.

[0008] However, prefabrication in sections along the length of the cap beam is currently the most widely used method. However, since it is not a balanced system before splicing is completed, the construction measures are complicated, which limits the promotion and application of the technology.

[0009] The hollow high-strength concept is currently only tested in a small number of projects due to the increased cost.

[0010] Therefore, how to reduce the weight of the segments, reduce the difficulty of transportation and lifting, and ensure the self-balance of the cap beam, while reducing the investment in installation measures and improving construction efficiency has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0011] In view of the above-mentioned defects of the prior art, the utility model provides an assembled segmented cap beam connection structure, the purpose of which is to greatly reduce the weight of the prefabricated segments of the cap beam, significantly reduce the difficulty of transportation and lifting, and the cap beam structure can maintain its own balance during the installation process. Compared with the segmented prefabricated cap beam in the prior art, it can significantly reduce the investment in installation process measures and improve construction efficiency.

[0012] To achieve the above-mentioned purpose, the utility model discloses an assembled segmented cap beam connection structure, comprising at least two prefabricated segments arranged along the width direction;

[0013] During construction, all the segments are erected in sequence along the width direction;

[0014] In every two adjacent segments, the segment erected first and the segment erected later are connected via a hinged seam structure located at the upper ends of the connecting surfaces;

[0015] Each hinged joint structure comprises:

[0016] A first notch and a plurality of short U-shaped steel bars are located in one of the two segments that is first erected.

[0017] A second notch and a plurality of long U-shaped steel bars of another segment which are arranged between the two segments,

[0018] A high-strength, high-toughness concrete material filling the first notch and the second notch respectively;

[0019] Each of the first notch and the corresponding second notch are located at the ridgeline position between the corresponding connecting surface and the upper surface of the corresponding segment, and a rectangular concave with the same inward concave depth and not exceeding half of the thickness of the cap beam is formed at the corresponding ridgeline position;

[0020] The two straight ends of each short U-shaped steel bar are arranged parallel to the width direction of the cap beam and are buried in the corresponding segment, and the arc-shaped ends are located within the corresponding first notch range;

[0021] The two straight ends of each long U-shaped steel bar are arranged parallel to the width direction of the cap beam and buried in the corresponding segment, and the arc-shaped ends extend to the range of the corresponding first notch and overlap with the arc-shaped ends of the short U-shaped steel bars at the corresponding positions.

[0022] Preferably, the high-strength and high-toughness concrete material is steel fiber concrete and UHPC material.

[0023] Beneficial effects of the utility model:

[0024] The application of the utility model can greatly reduce the weight of the prefabricated segments of the cap beam, significantly reduce the difficulty of transportation and lifting, and the cap beam structure can maintain its own balance during the installation process. Compared with the segmented prefabricated cap beam in the prior art, it can significantly reduce the investment in installation process measures and improve construction efficiency.

[0025] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a second notch and a corresponding long U-shaped steel bar in an embodiment of the utility model is shown.

[0027] Figure 2 A schematic structural diagram of a first notch and a corresponding short U-shaped steel bar in an embodiment of the utility model is shown.

[0028] Figure 3 A schematic structural diagram of the overlap of long U-shaped steel bars and short U-shaped steel bars in a hinged joint structure in one embodiment of the utility model is shown.

[0029] Figure 4 A schematic diagram showing a hinged joint structure filled with high-strength and high-toughness concrete material in one embodiment of the utility model is shown. DETAILED DESCRIPTION

[0030] Example

[0031] like Figures 1 to 4 As shown, the assembled segmented cap beam connection structure includes at least two prefabricated segments 1 arranged along the width direction;

[0032] During construction, all segments 1 are erected in sequence along the width direction;

[0033] In every two adjacent segments 1, the segment 1 erected first and the segment 1 erected later are connected by a hinged joint structure located at the upper end of the connecting surface;

[0034] Each hinged joint structure includes:

[0035] The first notch and a plurality of short U-shaped steel bars 2 are located in one of the two corresponding segments 1 that is first erected.

[0036] The second notch of another segment 1 and a plurality of long U-shaped steel bars 3 are located between the two corresponding segments 1.

[0037] High-strength, high-toughness concrete material 4 filling the corresponding first and second slots;

[0038] Each first notch and the corresponding second notch are located at the ridgeline position between the corresponding connecting surface and the upper surface of the corresponding segment 1, and a rectangular concave with the same inward concave depth and not exceeding half the thickness of the cap beam is formed at the corresponding ridgeline position;

[0039] The two straight ends of each short U-shaped steel bar 2 are arranged parallel to the width direction of the cap beam and are buried in the corresponding segment 1, and the arc-shaped ends are located within the corresponding first notch range;

[0040] The two straight ends of each long U-shaped steel bar 3 are arranged parallel to the width direction of the cap beam and buried in the corresponding segment 1, and the arcuate ends extend to the range of the corresponding first notch and overlap with the arcuate ends of the short U-shaped steel bars 2 at the corresponding positions.

[0041] The utility model connects the prefabricated structure pieces of the cap beam by means of hinged joints, thus avoiding the defects of a hinged joint connection with a depth equivalent to the cap beam, such as a large amount of on-site pouring and difficulty in ensuring construction quality.

[0042] In addition, high-strength and high-toughness materials such as steel fiber concrete and UHPC are used in post-casting to replace rebars, significantly improving construction efficiency.

[0043] In each hinged joint structure, the cap beam segments erected first use short U-shaped bars, which can avoid the influence of the extension of the U-shaped bars of the segments erected first on the vertical fall of the segments erected later. The segments erected later use long U-shaped bars, which can maximize the lap length of the U-shaped bars.

[0044] In certain embodiments, the high-strength and high-toughness concrete material 4 is steel fiber concrete and UHPC material.

[0045] like Figures 2 to 4 As shown, the utility model also provides a construction method of an assembled segmented cap beam connection structure, comprising the following steps:

[0046] Step 1: prefabricate all the segments 1 in a factory and transport all the segments 1 to the construction site;

[0047] Step 2: Set up the first shard 1;

[0048] Step 3, erecting the lower fast segment at the interface of the segment 1 that has been erected and provided with the first notch, and aligning and overlapping each long U-shaped steel bar 3 with the corresponding short U-shaped steel bar 2 to form a groove for pouring the high-strength and high-toughness concrete material 4;

[0049] Step 4: Repeat step 3 until all shards 1 are set up;

[0050] Step 5: pour high-strength and high-toughness concrete material 4 into all the grooves to form a hinged joint structure.

[0051] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. Assembled segmented cap beam connection structure; characterized in that: The invention comprises at least two prefabricated structure segments (1) arranged in a width direction; During construction, all the segments (1) are erected in sequence along the width direction; In every two adjacent segments (1), the segment (1) erected first and the segment (1) erected later are connected via a hinged joint structure located at the upper ends of the connecting surfaces; Each hinged joint structure comprises: A first notch and a plurality of short U-shaped steel bars (2) located in one of the two segments (1) which is first erected. A second notch and a plurality of long U-shaped steel bars (3) of another segment (1) which is arranged between the two segments (1) respectively. A high-strength, high-toughness concrete material (4) filling the first notch and the second notch respectively; Each of the first notches and the corresponding second notches are located at the ridgeline position between the corresponding connecting surface and the top of the corresponding slice (1), and a rectangular concave with the same inward concave depth and not exceeding half the thickness of the cap beam is formed at the corresponding ridgeline position; The two straight ends of each short U-shaped steel bar (2) are arranged parallel to the width direction of the cap beam and are buried in the corresponding segment (1), and the arc-shaped ends are located within the range of the corresponding first notch; The two straight ends of each of the long U-shaped steel bars (3) are arranged parallel to the width direction of the cap beam and are buried in the corresponding segment (1), and the arc-shaped ends extend to the range of the corresponding first notch and overlap with the arc-shaped ends of the short U-shaped steel bars (2) at the corresponding positions.

2. The assembled segmented cap beam connection structure according to claim 1 is characterized in that: The length of each of the long U-shaped steel bars (3) extending out of the corresponding second notch is more than half of the width of the corresponding first notch.

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