Large-span prestressed concrete continuous beam bridge full framing construction structure
By setting up a closed section and reinforced concrete connecting blocks in the full-house bracket construction structure of a large span prestressed concrete continuous beam bridge, the problems of long construction period, uneven linear shape and high cost are solved, and the effects of short construction period, beautiful linear shape and reasonable stress are achieved.
Patent Information
- Application Number
- CN202421020901.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-11
AI Technical Summary
There are difficulties in online type, cost control and stress-bearing of large span prestressed concrete continuous beam bridges. The existing technology is difficult to meet the stress-bearing needs under the conditions of short construction period and smooth beam bottom line.
The construction structure of the full-tang bracket is adopted, including the full-tang bracket and variable-section box beam. By setting up a closing section and reinforced concrete connection block in the middle of the span, longitudinal prestressed steel bundles are reasonably set up to ensure that the beam body does not appear or has a small positive bending moment in the middle of the span.
It effectively shortens the construction cycle, ensures the beautiful linear shape and reasonable stress of the structure, and reduces the material usage and structural self-weight, reducing costs.
Smart Images
Figure CN222632053U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a full-bridge bracket construction structure for a large-span prestressed concrete continuous beam bridge, belonging to the technical field of bridge construction. Background Art
[0002] Prestressed concrete continuous beam bridges usually adopt two structural forms: one-time construction of the bridge with full-span scaffolding and segmented casting of hanging basket cantilever. The segmented casting of hanging basket cantilever is adopted, and the longitudinal prestressed steel strands are anchored in segments to offset the positive bending moment under the constant load state in the mid-span. However, compared with the full-span scaffolding design structure, this structural form has more longitudinal segments, resulting in a longer construction period, uneven bottom plate joints of the box girder section by section, and uneven longitudinal line shape of the beam body. The one-time construction of the bridge with a scaffold will lead to a large positive bending moment at the mid-span section under the constant load state, and the section height needs to be increased to meet the force requirements. Increasing the section height changes the bridge line shape and reduces the clearance under the bridge. At the same time, the material consumption and structural deadweight of the bridge are increased, which increases the cost. It is difficult for large-span prestressed concrete continuous beam bridges to achieve a relatively ideal state in terms of line shape, cost control and force. Utility Model Content
[0003] In order to solve the technical problems existing in the prior art, the utility model provides a large-span prestressed concrete continuous beam bridge full-bridge support construction structure which is convenient to construct, simple and easy to operate, has a short construction period, and has a smooth bottom line profile of the beam.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is a full-span support construction structure of a large-span prestressed concrete continuous beam bridge, including a full-span support and a variable-section box beam, wherein variable-section box beams are arranged on both sides of the top of the full-span support, a closing section is arranged in the middle of the two variable-section box beams, piers are arranged at the ends of the variable-section box beams, and reinforced concrete connecting blocks are arranged on the box chamber side plates of the variable-section box beam, longitudinal prestressed steel bundle connecting holes are reserved on the reinforced concrete connecting blocks, the longitudinal prestressed steel bundles of the variable-section box beam are respectively connected to the longitudinal prestressed steel bundle connecting holes arranged in the front, and the longitudinal prestressed steel bundles of the last level of the variable-section box beam are anchored at both ends of the closing section.
[0005] Preferably, the embedded steel bar frame of the reinforced concrete connection block is embedded in the variable-section box girder, and after the variable-section box girder is cast, the reinforced concrete connection block is cast, and the length of the reinforced concrete connection block is 2.5-3.5m.
[0006] Preferably, the reinforced concrete connecting block is a trapezoidal structure with a variable cross-section, and the cross-section of the reinforced concrete connecting block gradually increases along the tensile direction of the longitudinal prestressed steel strand.
[0007] Preferably, the position of the reinforced concrete connecting block is determined according to the anchoring position of the longitudinal prestressed steel strand.
[0008] Compared with the prior art, the utility model has the following technical effects: the utility model adopts a structural form that meets the construction of full-span brackets, and only sets a closing section at the mid-span. By reasonably setting the longitudinal prestressed steel bundles, the longitudinal prestressed steel bundles are tensioned before the beam body is closed, so that there is no positive bending moment or a small positive bending moment at the mid-span of the beam body, and the remaining closing bundles are tensioned after the closing section is cast. At the same time, since the upper box girder only sets the closing section at the mid-span, the conventional method of anchoring the web steel bundle at the segment cannot be realized. In order to meet the force requirements, this structural form adopts the arrangement of reinforced concrete connecting blocks at the web to meet the requirements of tensioning the longitudinal prestressed steel bundles. This structural form effectively combines the advantages of full-span bracket one-time bridge construction and hanging basket construction, and overcomes its shortcomings. It effectively reduces the number of longitudinal beam segments, meets the construction requirements of the full-span bracket, ensures the beautiful linear shape of the structure, and reasonable force, while greatly shortening the construction period and generating good economic value. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a structural schematic diagram of the utility model.
[0010] Figure 2 It is a schematic diagram of the cross-sectional structure of the variable-section box girder in the utility model. DETAILED DESCRIPTION
[0011] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0012] like Figure 1 and Figure 2 As shown, a full-span support construction structure of a large-span prestressed concrete continuous beam bridge includes a full-span support 1 and a variable-section box girder 2. Variable-section box girders 2 are arranged on both sides of the top of the full-span support 1, a closing section 3 is arranged in the middle of the two variable-section box girders 2, and piers 4 are arranged at the ends of the variable-section box girder 2. Reinforced concrete connecting blocks 5 are arranged on the side plates of the box chamber of the variable-section box girder 2. Longitudinal prestressed steel bundle connecting holes 6 are reserved on the reinforced concrete connecting blocks 5. The longitudinal prestressed steel bundles of the variable-section box girder 2 are respectively connected to the longitudinal prestressed steel bundle connecting holes 6 arranged in the front, and the longitudinal prestressed steel bundles of the last-level variable-section box girder are anchored at both ends of the closing section 3.
[0013] The utility model adopts a construction form of full-span bracket and one-time bridge construction. First, the piers on both sides of the variable-section box girder 2 are designed and constructed according to the drawings. Then, after the pier construction is completed, the full-span bracket is arranged, and the variable-section box girder on the upper part of the full-span bracket is cast, and then the reinforced concrete connection block 5 is cast. After complete solidification, the prestressed steel strands are tensioned and fixed on the reinforced concrete connection block 5. Finally, the closing section is constructed and cast, and the remaining prestressed steel strands are tensioned at the same time.
[0014] Among them, the embedded steel bar frame of the reinforced concrete connection block 5 is embedded in the variable-section box girder 2, and after the variable-section box girder is cast, the reinforced concrete connection block 5 is cast, and the length of the reinforced concrete connection block 5 is 2.5-3.5m. The reinforced concrete connection block 5 is a trapezoidal structure with a variable cross-section, and the cross-section of the reinforced concrete connection block 5 gradually increases along the tensile direction of the longitudinal prestressed steel bundle. The position of the reinforced concrete connection block 5 is used to determine the anchor position of the longitudinal prestressed steel bundle. The reinforced concrete connection block 5 adopts this structure, fully considering the force and making a reasonable arrangement according to the tensioning direction of the longitudinal prestressed steel bundle, and the construction is more flexible and convenient.
[0015] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims
1. A large-span prestressed concrete continuous beam bridge full-bridge support construction structure, comprising a full-bridge support and a variable-section box beam, characterized in that: Variable-section box girders are arranged on both sides of the top of the full-span support, a closing section is arranged in the middle of the two variable-section box girders, bridge piers are arranged at the ends of the variable-section box girders, reinforced concrete connecting blocks are arranged on the box chamber side plates of the variable-section box girders, longitudinal prestressed steel bundle connecting holes are reserved on the reinforced concrete connecting blocks, the longitudinal prestressed steel bundles of the variable-section box girders are respectively connected to the longitudinal prestressed steel bundle connecting holes arranged in the front, and the longitudinal prestressed steel bundles of the last level of the variable-section box girders are anchored at both ends of the closing section.
2. The full-bridge support construction structure of a long-span prestressed concrete continuous beam bridge according to claim 1 is characterized in that: The embedded steel bar frame of the reinforced concrete connection block is embedded in the variable-section box girder, and after the variable-section box girder is cast, the reinforced concrete connection block is cast. The length of the reinforced concrete connection block is 2.5-3.5m.
3. A large-span prestressed concrete continuous beam bridge full-bridge support construction structure according to claim 1 or 2, characterized in that: The reinforced concrete connection block is a trapezoidal structure with a variable cross-section, and the cross-section of the reinforced concrete connection block gradually increases along the tensile direction of the longitudinal prestressed steel strand.
4. The full-bridge support construction structure for a long-span prestressed concrete continuous beam bridge according to claim 3 is characterized in that: The position of the reinforced concrete connecting block is used to be determined according to the anchoring position of the longitudinal prestressed steel strand.