Construction structure for bent cap of cliff-crossing section in mountainous area

Abstract

The invention relates to the field of expressway construction methods, in particular to a mountainous area steep-cliff-crossing section bent cap construction structure which is characterized in that width piers, single-column piers and a bridge floor of a bent cap structure are combined, so that the arrangement position of the single-column piers is adjusted, the stability of the construction structure is realized, and the construction efficiency is improved. The bridge floor is arranged between a highway side and a cliff side, a pier structure is fixedly arranged at the bottom of the bridge floor, and the bridge floor is of a bent cap structure; the bridge pier structure comprises a single-column pier, a left width pier and a right width pier, the left width pier, the right width pier and the single-column pier are sequentially arranged in the cross section direction of the bridge floor, the single-column pier is close to one side of the cliff edge, and the bottom of the bridge floor is fixedly connected with the top faces of the left width pier, the right width pier and the single-column pier. The method is particularly suitable for road construction of cliff-crossing sections in mountainous areas.

Description

Technical Field

[0001] The invention relates to the field of highway construction methods, and in particular to a cap beam construction structure across a steep cliff section in a mountainous area. Background Art

[0002] At present, in the design and construction of bridges near steep cliffs on mountain highways, in order to ensure the transportation of materials, the bridge line shape is usually designed according to the existing secondary or tertiary road plane line shape. Since the original secondary and tertiary roads are basically built around the mountains, it is common for the bridge deck to be located on or across the steep cliff in the highway line design, that is, one side of the bridge deck is on the road side, and the other side of the bridge deck is on the cliff side. In the conventional pier design scheme, the bridge is a conventional beam bridge, and the conventional bridge structure inevitably requires part of the bridge to be constructed on the steep cliff, which has high requirements for on-site construction conditions and a high safety risk in construction. Among them, if the bridge structure optimization and layout design are improper, it will bring many problems to the subsequent construction, affecting both the progress and the appearance quality, and there are safety risks.

[0003] Specifically, the existing conventional bridge structure has a corresponding pier structure that is a traditional double-column pier structure. In a construction scenario where one side is a highway and the other side is a cliff, the right pier on the right side of the pier in the double-column pier structure will be too close to the cliff on its right side, making construction difficult. At the same time, since the right pier is surrounded by the cliff and lacks sufficient covering soil, the lateral covering soil of the right pier pile foundation will be too thin, which does not meet the lateral covering soil requirements of the friction piles required by the design and specifications, making it difficult for the right pier to provide a stable support effect. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cap beam construction structure for crossing steep cliff sections in mountainous areas by combining span piers, single-column piers and a bridge deck with a cap beam structure, thereby adjusting the position of the single-column pier arrangement, thereby achieving stability of the construction structure and improving construction efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a cap beam construction structure across a steep cliff section in a mountainous area, including a bridge deck, wherein the bridge deck is arranged between the side of a highway and the side of a cliff, and a pier structure is fixedly arranged at the bottom of the bridge deck, and the bridge deck is a cap beam structure; the pier structure includes a single-column pier, a left-width pier and a right-width pier, and the left-width pier, the right-width pier and the single-column pier are arranged in sequence along the cross-sectional direction of the bridge deck, and the single-column pier is close to the side of the cliff, and the bottom of the bridge deck is fixedly connected to the top surfaces of the left-width pier, the right-width pier and the single-column pier respectively.

[0006] Furthermore, the top surfaces of the left pier, the right pier and the single-column pier are connected to the bridge deck through a reinforced concrete structure to form an integrated cast structure.

[0007] Furthermore, the bridge deck includes cap beam reinforcement, which is arranged on both sides of the single-column pier axis of the single-column pier, and the cap beam reinforcement is arranged obliquely to the single-column pier axis.

[0008] Furthermore, the bridge deck includes cap beam reinforcement, which is arranged on both sides of the left pier axis of the left pier, and the cap beam reinforcement is arranged obliquely to the left pier axis.

[0009] Furthermore, the bridge deck includes cap beam reinforcement, which is arranged on both sides of the right pier axis of the right pier, and the cap beam reinforcement is arranged obliquely to the right pier axis.

[0010] Furthermore, the axis of the single-column pier, the axis of the left-width pier of the left-width pier, and the axis of the right-width pier of the right-width pier are arranged parallel to each other.

[0011] The beneficial effects of the present invention are as follows: the present scheme first adjusts the structure of the bridge deck to a cap beam structure, and on this basis, supports the bridge deck of the cap beam structure through a single column pier and a left pier and a right pier, that is, the bottom of the bridge deck is reliably supported, and the construction position of the single column pier can be far away from the edge of the cliff. Specifically, compared with the defect that the right column pier in the traditional double column pier structure is too close to the edge of the cliff, the present construction structure can first move the single column pier close to the side of the cliff to the side of the road, that is, the single column pier is constructed at a position far away from the edge of the cliff, thereby reducing the difficulty of the construction of the single column pier, and the lateral covering of the pile foundation of the single column pier becomes thick enough, ensuring the lateral covering requirement of the single column pier. Secondly, the bottom of the bridge deck located on the left side of the single column pier is supported by the left pier and the right pier, forming a double pier structure composed of the left and right piers, and the support structure that cooperates with the single column pier to bear the upper structure and traffic loads together optimizes the overall stability of the bridge and the stress of the bridge. In addition, the use of a cap beam structure can also save materials, facilitate later construction while achieving structural stability, and reduce construction safety risks. The present invention has a simple structure, convenient construction, effectively shortens the overall construction time, reduces engineering construction risks, and is particularly suitable for road construction across steep cliff sections in mountainous areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of an embodiment of the construction structure of the present invention.

[0013] Figure 2 yes Figure 1 Top view of the .

[0014] Figure 3 yes Figure 2 Schematic diagram of II.

[0015] Figure 4 It is a schematic diagram of the reinforcement of the internal cap beam of the bridge deck of the present invention.

[0016] Markings in the figure are: road side 1, cliff edge 2, construction slope 3, right pier 4, right pier axis 41, left pier 5, left pier axis 51, single column pier 6, single column pier axis 61, bridge deck 7, cap beam reinforcement 71. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 , Figure 2 , Figure 3 , Figure 4 The figure shows an embodiment of the cap beam construction structure for a mountainous area across a steep cliff. The left side of the bridge deck 7 under construction is the road side 1, which is the original second- and third-level roads built around the mountain. The bridge deck 7 under construction is used to connect the original second- and third-level roads with the newly built mountainous expressway. The right side of the bridge deck 7 is the cliff side 2, and the bridge deck 7 is constructed at the construction slope 3 between the road side 1 and the cliff side 2.

[0019] The bridge deck 7 is a cap beam structure. A single-column pier 4 is arranged at the bottom of the bridge deck 7 near the cliff edge 2. A right-side pier 4 is arranged at the bottom of the bridge deck 7 near the middle position. A left-side pier 5 is arranged at the bottom of the bridge deck 7 near the road side 1. The single-column pier 4, the left-side pier 5 and the right-side pier 4 jointly support the bridge deck 7. Since only a single-column pier 4, i.e., one pier, is used in this solution, compared with the traditional double-column pier structure, the single-column pier 4 can be arranged away from the cliff edge 2 on the right. This position adjustment greatly reduces the construction difficulty of the single-column pier 4, and the construction can be carried out by traditional mechanical methods, which reduces the construction difficulty. At the same time, the position of the single-column pier 4 can meet the lateral covering requirements and ensure the subsequent support stability of the single-column pier 4. On this basis, the left span pier 5, the right span pier 6 and the single-column pier 4 are arranged in sequence along the cross-sectional direction of the bridge deck 7, and the bottom of the bridge deck 7 is fixedly connected to the top surfaces of the left span pier 5, the right span pier 6 and the single-column pier 4 respectively. The left span pier 5 and the right span pier 6 can be together with the single-column pier 4 to increase the stability of the bridge deck 7, or the left span pier 5, the right span pier 6 and the single-column pier 4 can be selected to form an integral reinforced concrete cap beam together with the bridge deck 7 of the cap beam structure.

[0020] As a preferred embodiment of the bridge deck 7, Figure 4 As shown, the cap beam reinforcement 71 of the bridge deck 7 can be selected to be carried out according to the following scheme: the cap beam reinforcement 71 is set on both sides of the single column pier axis 61 of the single column pier 6, and the cap beam reinforcement 71 is set obliquely to the single column pier axis 61; the cap beam reinforcement 71 is set on both sides of the left pier axis 51 of the left pier 5, and the cap beam reinforcement 71 is set obliquely to the left pier axis 51; the cap beam reinforcement 71 is set on both sides of the right pier axis 41 of the right pier 4, and the cap beam reinforcement 71 is set obliquely to the right pier axis 41. Figure 4As shown, the cap beam reinforcement 71 is arranged obliquely to the left pier axis 51, the right pier axis 41 and the single column pier axis 61, which can form better oblique tension when supported by the left pier 5, the right pier 4 and the single column pier 6, thereby ensuring uniform stress on the entire bridge deck 7.

Claims

1. A cap beam construction structure for a steep cliff section in a mountainous area, comprising a bridge deck (7), wherein the bridge deck (7) is arranged between a road side (1) and a cliff side (2), and a pier structure is fixedly arranged at the bottom of the bridge deck (7), characterized in that: The bridge deck (7) is a cap beam structure; the bridge pier structure comprises a single-column pier (6), a left-width pier (5) and a right-width pier (4); the left-width pier (5), the right-width pier (4) and the single-column pier (6) are arranged in sequence along the cross-sectional direction of the bridge deck (7); the single-column pier (6) is close to the cliff edge (2); and the bottom of the bridge deck (7) is fixedly connected to the top surfaces of the left-width pier (5), the right-width pier (4) and the single-column pier (6), respectively.

2. The cap beam construction structure across steep cliff section in mountainous area as claimed in claim 1 is characterized by: The top surfaces of the left pier (5), the right pier (4) and the single-column pier (6) are connected to the bridge deck (7) through a reinforced concrete structure to form an integrated cast structure.

3. The cap beam construction structure across steep cliff section in mountainous area as claimed in claim 2 is characterized by: It comprises a cap beam reinforcement (71) of a bridge deck (7), wherein the cap beam reinforcement (71) is arranged on both sides of a single-column pier axis (61) of a single-column pier (6), and the cap beam reinforcement (71) is arranged obliquely to the single-column pier axis (61).

4. The cap beam construction structure across steep cliff section in mountainous area as claimed in claim 2 is characterized by: It comprises a cap beam reinforcement (71) of the bridge deck (7), wherein the cap beam reinforcement (71) is arranged on both sides of the left pier axis (51) of the left pier (5), and the cap beam reinforcement (71) is arranged obliquely to the left pier axis (51).

5. The cap beam construction structure across steep cliff section in mountainous area as claimed in claim 2 is characterized by: It comprises a cap beam reinforcement (71) of the bridge deck (7), the cap beam reinforcement (71) is arranged on both sides of the right pier axis (41) of the right pier (4), and the cap beam reinforcement (71) is arranged obliquely to the right pier axis (41).

6. The cap beam construction structure for a mountainous area across a steep cliff section according to any one of claims 1 to 5, characterized in that: The single-column pier axis (61) of the single-column pier (6), the left-width pier axis (51) of the left-width pier (5), and the right-width pier axis (41) of the right-width pier (4) are arranged parallel to each other.

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