Temporary consolidation structure for concrete box girder and pier of continuous beam swivel bridge

Abstract

The utility model discloses a continuous beam swivel bridge concrete box girder and pier temporary consolidation structure, the temporary consolidation structure can connect a turntable, a pier and a box girder into a whole, both sides of the pier are provided with a plurality of temporary pier columns, each temporary pier column comprises at least two steel pipes which are concentrically arranged, concrete is poured between every two adjacent steel pipes and in the steel pipe located on the innermost side. A plurality of embedded structures are arranged on the turntable and the bridge pier; the embedded structure comprises anchoring steel bars and anchoring steel plates. One end of each temporary pier column is connected with the embedded steel plate on the turntable, the other end of each temporary pier column is provided with an anchoring reinforcement cage, one end, far away from the temporary pier column, of the anchoring reinforcement cage can penetrate through the bottom of the box girder to be connected with the main girder, and a temporary support for supporting the box girder is formed on the anchoring reinforcement cage in a pouring manner; the temporary pier column and the pier can be stably connected through the anchoring structure, it can be guaranteed that dislocation and overturning cannot occur in the rotating process through the temporary consolidation structure, and an original concrete structure cannot be damaged when the temporary consolidation structure is dismantled.

Description

Technical Field

[0001] The utility model relates to the field of bridge engineering construction, in particular to a temporary consolidation structure of a continuous beam rotary bridge concrete box beam and a bridge pier. Background Art

[0002] For newly built bridges crossing existing lines, the rotation construction method is widely used because it has little impact on the line and is easy to construct. The principle is to prefabricate the bridge structure at a position outside the design axis and then use a power device to rotate it to the designed position. When the continuous beam is rotated, the turntable drives the upper turntable and the bridge piers to rotate, and the bridge piers drive the main beam to rotate. It is difficult for permanent supports to form a consolidation constraint on the main beam. Therefore, a temporary pier-beam consolidation structure is required. In addition, for the continuous beam rotation bridge with cast-in-place brackets, the unbalanced self-weight at both ends is caused by the asymmetry of the two sides of the main beam and construction. The unbalanced torque after the bracket is removed also needs to be borne by the temporary pier-beam consolidation structure. The temporary pier-beam consolidation structure is the key structure for the success of the rotation. The existing continuous beam consolidation structure does not consider the torque it bears during the rotation process when used for rotation construction. The installation is complicated. When it is applied to bridges with large spans, heavy self-weight, and large unbalanced torque, the construction cost is high. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides a temporary consolidation structure for the concrete box girder and piers of a continuous beam rotary bridge, through which the box girder, the piers and the turntable can be ensured to form a whole, and dislocation and overturning will not occur during the rotation process; and the original concrete structure will not be damaged when the temporary consolidation structure is dismantled.

[0004] In order to achieve the above purpose, the specific scheme adopted by the utility model is:

[0005] A temporary consolidation structure of a concrete box girder and a pier of a continuous beam swivel bridge, wherein the temporary consolidation structure can connect a turntable, a pier arranged in the middle of the turntable and a box girder supported by the pier into a whole, wherein a plurality of temporary pier columns are arranged on both sides of the pier, each temporary pier column comprises at least two concentrically arranged steel pipes, and concrete is poured between two adjacent steel pipes and in the innermost steel pipe;

[0006] A plurality of embedded structures are arranged on both sides of the pier on the turntable, and a plurality of embedded structures are also arranged on the pier at different heights; each embedded structure includes an anchoring steel bar extending into and fixed to the turntable or the pier, and an anchoring steel plate arranged on the anchoring steel bar;

[0007] One end of each temporary pier is connected to the corresponding embedded steel plate on the turntable, and the other end is provided with an anchor steel cage. The end of the anchor steel cage away from the temporary pier can pass through the bottom of the box beam and connect to the main beam. A temporary support for supporting the box beam is cast on the anchor steel cage.

[0008] The temporary pier column and the bridge pier can be firmly connected by the anchoring structure, and the anchoring structure includes a first anchoring structure arranged between two adjacent temporary pier columns and a second anchoring structure arranged between the temporary pier column and the embedded steel plate on the bridge pier.

[0009] Furthermore, the temporary support includes at least two concrete layers formed by pouring and arranged at intervals, the top concrete layer abuts against the box beam, and the bottom concrete layer abuts against the temporary pier, and a number of steel meshes are provided in each concrete layer. A poured sulfur mortar layer is provided between two adjacent concrete layers, and resistance wires are arranged in the sulfur mortar layer; the temporary support is cylindrical as a whole, and its diameter is equal to the diameter of the temporary pier.

[0010] Furthermore, a stiffening steel plate is provided between the lower portion of the temporary pier and the anchoring steel plate.

[0011] Furthermore, the thickness of the anchor steel plate is 20 mm; the depth of the anchor steel bar extending into the turntable is not less than 1.5 m, and the depth of the anchor steel bar extending into the bridge pier is not less than 0.6 m.

[0012] Furthermore, one end of the anchor steel cage is fixedly connected to the outer peripheral surface of the upper end of the innermost steel pipe in the temporary pier.

[0013] Furthermore, the first anchoring structure is a double-jointed I-beam, and the second anchoring structure is a scissors brace.

[0014] Furthermore, the temporary pier includes an inner steel pipe and an outer steel pipe which are arranged concentrically; wherein the diameter of the outer steel pipe is greater than 800 mm and the wall thickness is greater than 10 mm; the diameter of the inner steel pipe is greater than 500 mm and the wall thickness is greater than 8 mm; and the strength grade of the concrete pipe is not less than C40.

[0015] Furthermore, a permanent support and a concrete support block for supporting the box girder are provided on the top of the pier.

[0016] Beneficial effects:

[0017] 1) The temporary consolidation structure of the utility model includes a temporary pier, one end of which is connected to the embedded structure of the turntable, and the other end is connected to an anchor steel cage. A temporary support for supporting the box girder is provided on the top of the anchor steel. A second anchor structure is connected between the temporary pier and the embedded structure of the pier, and a first anchor structure is connected between two adjacent temporary piers. The above structure can ensure the stability of the temporary consolidation structure. When the temporary consolidation structure needs to be dismantled, it is only necessary to cut the lower end of the temporary pier from the embedded structure on the turntable. The temporary support can be easily dismantled by powering on. The overall dismantling of the temporary consolidation structure is convenient and the support stability is strong.

[0018] 2) Each temporary pier column includes at least two concentrically arranged steel pipes. Concrete is poured between two adjacent steel pipes and in the innermost steel pipe. Compared with the commonly used temporary steel pipe pier columns, it has higher strength.

[0019] 3) Pre-embedded structures are provided on the piers and turntables, so that the concrete structure of the piers will not be affected when the temporary consolidation structure is removed.

[0020] 4) The embedded structure is respectively arranged on the turntable and the bridge pier. The embedded structure includes anchor steel plates and anchor steel bars. The anchor steel bars extend into the turntable or the bridge pier and are connected to the steel bars in the turntable or the bridge pier, which effectively ensures the stability of the temporary consolidation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the longitudinal elevation view of the temporary consolidation structure, box girder and piers.

[0022] Figure 2 This is the transverse elevation view of the temporary consolidation structure, box girder and piers.

[0023] Figure 3 A top view of the temporary consolidation structure.

[0024] Figure 4 for Figure 1 Cross-sectional view at point A.

[0025] Figure 5 for Figure 1 Cross-sectional view at point B.

[0026] Explanation of the accompanying drawings: 1-turntable, 2. Embedded structure, 201. Anchor steel plate, 202. Anchor steel bar, 3. First anchor structure, 4. Temporary pier, 401. Concrete member, 402. Outer steel pipe, 403. Inner steel pipe, 5. Anchor steel bar cage, 6. Temporary support, 601. Steel mesh, 602. Sulfur mortar layer, 603. Concrete layer, 7. Box girder, 8. Reinforcing steel plate, 9. Bridge pier, 10. Second anchor structure, 11. Concrete support block, 12. Permanent support. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0028] The technical solution of the present utility model will be further described below through specific implementation modes in conjunction with the accompanying drawings.

[0029] The utility model provides a temporary consolidation structure of a continuous beam rotating bridge box beam and a pier, which can connect a turntable 1, a pier 9 arranged in the middle of the turntable 1 and a box beam 7 supported by the pier 9 into a whole. Please refer to Figures 1 to 5 A plurality of temporary pier columns 4 are provided on both sides of the pier 9. The temporary pier columns 4 are the main load-bearing structures of the temporary consolidation structure. Each temporary pier column 4 includes at least two concentrically arranged steel pipes. Concrete is poured between two adjacent steel pipes and in the innermost steel pipe. The poured concrete as a whole is called a concrete member 401. The concrete member 401 includes a concrete column located in the center and a concrete pipe located between two adjacent steel pipes.

[0030] A plurality of embedded structures 2 are provided on both sides of the pier 9 on the turntable 1, one end of each temporary pier 4 is connected to the corresponding embedded structure 2 on the turntable 1, and an anchoring steel cage 5 is provided on the other end, and the end of the anchoring steel cage 5 away from the temporary pier 4 can pass through the bottom of the box beam 7 and be connected to the main beam, and a temporary support 6 for supporting the box beam 7 is cast on the anchoring steel cage 5, and the upper and lower ends of the temporary support 6 can respectively abut against the temporary pier 4 and the box beam 7, and the temporary support 6 includes at least two concrete layers 603 arranged at intervals by casting, and each concrete layer 603 is provided with a plurality of steel meshes 601, and a cast sulfur mortar layer 602 is provided between two adjacent concrete layers 603, and resistance wires are arranged in the sulfur mortar layer 602; the diameter of the temporary support 6 is equal to the diameter of the temporary pier 4.

[0031] A number of embedded structures 2 are also provided at different heights on the pier 9. The temporary pier column 4 can be firmly connected to the pier 9 through the anchoring structure. The anchoring structure includes a first anchoring structure 3 provided between two adjacent temporary pier columns 4, and a second anchoring structure 10 provided between the temporary pier column 4 and the embedded structure 2 on the pier 9. The integrity and stability of the temporary consolidation structure can be ensured through the anchoring structure.

[0032] The embedded structure 2 is arranged at the connection between the temporary pier 4 and the turntable 1 and the connection between the second anchor structure 10 and the bridge pier 9. The embedded structure 2 includes an anchor steel bar 202 extending into the turntable 1 or the bridge pier 9 for fixing, and an anchor steel plate 201 arranged on the anchor steel bar 202. The anchor steel plate 201 is 20 mm thick and is used to ensure the safety and firmness of each connection part. The size is determined according to the embedded position. The anchor steel bar 202 uses 32 mm HRB400 steel bars, which are respectively embedded in the bottom of the anchor steel plate 201 in the turntable 1 and the bridge pier 9, and welded with the steel bars in the turntable 1 and the bridge pier 9, extending at least 1.5 m into the turntable 1 and 0.6 m into the bridge pier 9. A reinforcing steel plate 8 is arranged between the lower part of the temporary pier 4 and the anchor steel plate 201 to enhance the stability of the temporary pier 4.

[0033] It should be noted that one end of the anchor steel cage 5 is fixedly connected to the end of the innermost steel pipe in the temporary pier 4, and the other end passes through the bottom of the box beam 7 and is connected to the main beam.

[0034] In detail, the first anchoring structure 3 is a double-jointed I-beam, and the second anchoring structure 10 is a scissors brace, so as to improve the integrity and stability of the temporary consolidation structure.

[0035] Specifically, the temporary pier 4 includes an outer steel pipe 402, an inner steel pipe 403 and concrete members 401 poured therein, which are located below the web of the box girder 7 and symmetrically arranged on both sides of the pier 9. The outer steel pipe 402 has a diameter greater than 800 mm and a wall thickness greater than 10 mm. The inner steel pipe 403 has a diameter greater than 500 mm and a wall thickness greater than 8 mm. The inner and outer steel pipes 402 and 403 are made of Q235 steel. The specific cross-sectional dimensions need to be designed based on the actual weight of the rotating bridge. The strength grade of the concrete member 401 is C40 or above.

[0036] Specifically, in the temporary support 6, the thickness of the sulfur mortar layer 602 is 50 mm, and the strength of the sulfur mortar layer 602 should be no less than 50 MPa. By pre-embedding the resistance wire in the sulfur mortar layer 602, it is convenient to remove the temporary consolidation structure. The anchor steel cage 5 uses 32 mm HRB400 steel bars, which are mainly used to resist the unbalanced moment at both ends of the box beam 7 and the torque generated by the rotation. One end of the anchor steel cage 5 passes through the bottom plate of the box beam 7 and is connected to the main beam. The length of the box beam 7 is not less than 1.5 m, and the other end is welded to the inner steel pipe 403 of the temporary pier 4. The overall length of the anchor steel cage 5 should be greater than 3 m.

[0037] The top of the pier 9 is provided with a permanent support 12 and a concrete support block 11 for supporting the box girder 7. The number of the permanent support 12 is at least one, and the number of the concrete support block 11 is at least one pair. The concrete support block 11 is a sandwich structure consisting of two upper and lower concrete layers and a sulfur mortar layer in the middle, and can be removed after the construction is completed.

[0038] When the temporary consolidation mechanism in the utility model is applied in actual engineering, the construction process is as follows:

[0039] (1) When the turntable 1 is constructed, anchor steel bars 202 and anchor steel plates 201 are embedded at different positions of the turntable 1, and the anchor steel bars 202 are welded to the steel bars in the turntable 1; when the bridge pier 9 is constructed, anchor steel bars 202 and anchor steel plates 201 are embedded at different heights of the bridge pier 9, and the anchor steel bars 202 are also welded to the steel bars in the bridge pier 9. After the bridge pier 9 is cast, the permanent support 12 and concrete support block 11 for supporting the box girder 7 are constructed;

[0040] (2) Construction of temporary pier 4: First, weld anchor steel cage 5 on the outer peripheral surface of the top of inner steel pipe 403, then use hoisting equipment to hoist outer steel pipe 7 and inner steel pipe 8 to the designed position for installation, concentrically weld inner steel pipe 403 and outer steel pipe 402 to anchor steel plate 201, and set stiffening steel plate 8 to improve the safety and stability of the connection. Construct temporary support 6 on the top of temporary pier 4, first pour a layer of concrete 603 with a thickness of about 100 mm, then pour a layer of sulfur mortar 602 with a thickness of 50 mm, embed resistance wire in the sulfur mortar layer, and pour a layer of concrete 603 on top of sulfur mortar layer 602 to reach the designed elevation of the bottom of the main beam. It should be noted that reinforcing steel mesh 601 is set in the upper and lower layers of concrete. At the same time, the second anchoring structure 10 between the temporary pier 4 and the bridge pier 9 and the first anchoring structure 3 between two adjacent piers are constructed, so that the temporary consolidation structure is connected with the turntable 1 and the bridge pier 9 as a whole;

[0041] (3) Construct the box girder 3. The box girder anchor steel cage 5 passes through the box girder bottom plate and is welded to the steel bars in the main beam.

[0042] (4) Carry out bridge rotation, box girder closure and system conversion. After completion, remove the temporary consolidation structure, energize the resistance wire in the sulfur mortar layer, and use electric heating method to quickly heat and melt the sulfur mortar layer to facilitate the removal of the temporary support 6, cut off the anchor steel cage 5, and complete the removal of the box girder bottom plate consolidation structure. Then, cut the bottom of the temporary pier 4 and remove the temporary pier 4.

[0043] At the same time, the following points should be noted during the construction of the temporary consolidation structure in the utility model:

[0044] (1) The bottom of the box girder 7 should take into account the bottom plate slope. The top surface of the temporary support 6 should be an inclined surface consistent with the slope of the bottom of the box girder 7. An isolation agent should be applied to the top surface of the temporary support 6. No material should be filled on the top and bottom surfaces of the temporary support 6 to ensure that the contact surface is flat.

[0045] (2) All welding construction must ensure the quality of the weld;

[0046] (3) When dismantling the temporary structure, in order to reduce damage to the concrete structure, the embedded structure 2 may not be dismantled.

[0047] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any equivalent changes or modifications made according to the essence of the utility model should be included in the protection scope of the utility model.

Claims

1. A temporary consolidation structure of a concrete box girder and a pier of a continuous beam swivel bridge, wherein the temporary consolidation structure can connect a turntable, a pier located in the middle of the turntable, and a box girder supported by the pier into a whole, characterized in that: A plurality of temporary pier columns are arranged on both sides of the bridge pier, each temporary pier column comprises at least two concentrically arranged steel pipes, and concrete is poured between two adjacent steel pipes and in the innermost steel pipe; A plurality of embedded structures are arranged on both sides of the pier on the turntable, and a plurality of embedded structures are also arranged on the pier at different heights; each embedded structure includes an anchoring steel bar extending into and fixed to the turntable or the pier, and an anchoring steel plate arranged on the anchoring steel bar; One end of each temporary pier is connected to the corresponding embedded steel plate on the turntable, and the other end is provided with an anchor steel cage. The end of the anchor steel cage away from the temporary pier can pass through the bottom of the box beam and connect to the main beam. A temporary support for supporting the box beam is cast on the anchor steel cage. The temporary pier column and the bridge pier can be firmly connected by the anchoring structure, and the anchoring structure includes a first anchoring structure arranged between two adjacent temporary pier columns and a second anchoring structure arranged between the temporary pier column and the embedded steel plate on the bridge pier.

2. A temporary consolidation structure of a continuous beam rotating bridge concrete box girder and a bridge pier according to claim 1, characterized in that: The temporary support includes at least two concrete layers that are arranged at intervals and formed by pouring. The top concrete layer is in contact with the box beam, and the bottom concrete layer is in contact with the temporary pier. Several steel meshes are arranged in each concrete layer. A poured sulfur mortar layer is arranged between two adjacent concrete layers, and resistance wires are arranged in the sulfur mortar layer. The temporary support is cylindrical as a whole, and its diameter is equal to the diameter of the temporary pier.

3. The temporary consolidation structure of the concrete box girder and the bridge pier of the continuous beam rotating bridge according to claim 1 is characterized in that: A reinforcing steel plate is provided between the lower part of the temporary pier and the anchoring steel plate.

4. The temporary consolidation structure of the concrete box girder and the bridge pier of the continuous beam rotating bridge according to claim 1 is characterized in that: The thickness of the anchor steel plate is 20mm; the depth of the anchor steel bar extending into the turntable is not less than 1.5m, and the depth of extending into the bridge pier is not less than 0.6m.

5. The temporary consolidation structure of the concrete box girder and the bridge pier of the continuous beam rotating bridge according to claim 1 is characterized in that: One end of the anchor steel cage is fixedly connected to the outer peripheral surface of the upper end of the innermost steel pipe in the temporary pier.

6. The temporary consolidation structure of the concrete box girder and the bridge pier of the continuous beam rotating bridge according to claim 1, characterized in that: The first anchoring structure is a double-jointed I-beam, and the second anchoring structure is a scissors brace.

7. The temporary consolidation structure of the concrete box girder and the bridge pier of the continuous beam rotating bridge according to claim 1, characterized in that: The temporary pier column includes an inner steel pipe and an outer steel pipe which are arranged concentrically; wherein the diameter of the outer steel pipe is greater than 800 mm and the wall thickness is greater than 10 mm; the diameter of the inner steel pipe is greater than 500 mm and the wall thickness is greater than 8 mm; and the strength grade of the concrete pipe is not less than C40.

8. The temporary consolidation structure of the concrete box girder and the bridge pier of the continuous beam rotating bridge according to claim 1, characterized in that: The top of the pier is provided with a permanent support and a concrete support block for supporting the box beam.

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