Multi-span continuous arch bridge arch ring support rapid turnover device and construction method thereof

Abstract

The invention discloses a multi-span continuous arch bridge arch ring support rapid turnover device and a construction method thereof, and belongs to the technical field of bridge engineering. The multi-span continuous arch bridge arch ring support rapid turnover device comprises an upper structure, a lower structure and a fixing structure; the fixing structure comprises an upper hoop and a lower hoop which are detachable and arranged on a pier, the upper hoop is used for being connected with a lower structure, and the lower hoop is used for being connected with an inclined strut. The lower structure comprises a lower beam frame, a lower beam frame cross beam, a jack and a force transmission beam; the upper structure comprises a template bracket, an upper beam frame and an upper beam frame cross beam; the upper beam frame and the upper beam frame cross beam are welded into a whole in a mutually perpendicular and staggered mode. The detachable upper structure, the detachable lower structure and the detachable fixing structure are constructed on the piers, so that the workload of repeatedly erecting a frame body in the arch ring construction of a traditional multi-span continuous arch bridge is reduced, the construction progress of an arch ring supporting structure and concrete pouring is ensured, and the turnover utilization rate and the construction efficiency of the frame body are improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a multi-span continuous arch bridge arch ring support rapid turnover device and a construction method thereof. Background Art

[0002] Arch bridges will generate horizontal thrust under the action of vertical loads, and horizontal cables are needed to offset this horizontal thrust, so that the lower foundation can bear a smaller horizontal force and ensure that the foundation is safe and reliable. Generally, the arch bridge body is equipped with a longitudinal beam, which refers to the beam that is in the same plane as the arch rib in the superstructure, arranged along the longitudinal direction of the bridge, and together with the crossbeam and bridge deck to form the bridge deck system. The longitudinal beam box refers to the box formed by the longitudinal beam top plate, bottom plate and left and right web plates (side plates). For single-span arch bridges, the horizontal cable is generally arranged in the longitudinal beam box. On the one hand, it can improve the use environment of the cable, and on the other hand, the cable anchoring structure can adopt the traditional steel anchor box. And such an arrangement can generally meet the requirements of horizontal cable tensioning, because the bridge deck area where the arch rib is located is generally a dividing strip, and the main beam can be arranged on the approach side. However, for multi-span arch bridges, in order to offset the horizontal thrust generated by the middle arch span, it is generally necessary to arrange segmental tie cables in the corresponding span. At this time, if the tie cables are still arranged in the steel box longitudinal beam, since the full-length cables have been arranged in the longitudinal beam box (the full-length cables are long cables that are originally set up in multi-span arch bridges and are pulled from one end of the entire bridge to the other end), adding segmental cables will make the space in the box crowded; in addition, multi-span continuous arch bridges require scaffolding and formwork supports during arch ring construction, and water operations require the construction of continuous construction trestles to cooperate with construction, and the workload of erecting various frames is huge. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-span continuous arch bridge arch ring support rapid turnover device and a construction method thereof, so as to reduce the workload of repeated erection of the frame, ensure the construction progress of the arch ring support structure and concrete pouring, improve the turnover rate of the frame and the construction efficiency, so as to solve the problems raised by the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a multi-span continuous arch bridge arch ring support rapid turnover device, comprising an upper structure, a lower structure and a fixed structure; the fixed structure comprises an upper hoop and a lower hoop arranged on the pier, and the upper hoop and the lower hoop are both composed of a hoop fixing part, a hoop rotating part, a connecting part and a high-strength bolt; the hoop fixing part is used to be fixed to the pier, and the hoop is tightened on the pier by high-strength bolts, a hoop rotating part is arranged inwardly at the middle position of the hoop fixing part, the hoop rotating part rotates around the pier, and is fastened to the center position of the hoop fixing part by high-strength bolts; a connecting part is arranged at the end position of the hoop rotating part, the connecting part of the upper hoop is used to connect to the lower structure, the connecting part of the lower hoop is used to connect to the diagonal brace, and the diagonal brace The other end is fixed to the lower beam frame, and the two ends of the lower beam frame are respectively fixed to the connecting pieces of the upper clamps on the adjacent piers; the lower structure includes a lower beam frame, a lower beam frame crossbeam, a jack and a force transmission beam; there are two lower beam frames in total, and a lower beam frame crossbeam is arranged every five meters between the two lower beam frames to connect and fix the two lower beam frames into an integral structure; the jack is installed on the lower beam frame and connected and fixed by high-strength bolts, and a force transmission beam is jointly supported above the two groups of jacks at the corresponding positions of the two lower beam frames; the upper structure includes a formwork support, an upper beam frame and an upper beam frame crossbeam; the upper beam frame and the upper beam frame crossbeam are vertically staggered and welded to form a whole, and the landing point of the formwork support is fixed to the upper beam frame and the upper beam frame crossbeam by welding.

[0005] Furthermore, the upper beam frame and the upper beam frame cross beam are made of steel sections, and the arrangement spacing between the upper beam frame and the upper beam frame cross beam is determined according to the erection spacing of the formwork support.

[0006] Furthermore, the end of the upper beam is not connected to any structure, and a beam end limiting groove is provided above the end of the upper beam at the arch foot of the formwork support to prevent the formwork support from longitudinally sliding.

[0007] Furthermore, the upper structure and the lower structure are connected into a whole by connecting the force transmission beam and the upper beam frame with high-strength bolts or welding.

[0008] Furthermore, the lower beam frame and the lower beam frame cross beam are made of steel sections, the number of jacks on the two lower beam frames is the same, and the total number of jacks is determined by on-site construction load calculation.

[0009] Furthermore, the force transmission beam is made of I-beam and fixed with a jack by welding.

[0010] The present invention provides another technical solution: a construction method of a multi-span arch bridge arch ring support rapid turnover device, comprising the following steps:

[0011] S1: Before construction, determine the number of jacks, the spacing of the upper beams of the superstructure and the upper beam crossbeams assembled into a grid according to the construction plan;

[0012] S2: Install upper and lower clamps at adjacent piers respectively, and keep the clamps at the same level;

[0013] S3: After assembling all parts of the lower structure on the ground through high-strength bolts and welding, use a tower crane to hoist the lower beam frame, and fix it with high-strength bolts and connectors. The lower beam frame is connected to the diagonal brace;

[0014] S4: Weld the upper beam frame and the upper beam frame cross beam of the upper structure into a grid form on the ground, hoist them above the force transmission beam and connect them into a whole;

[0015] S5: The scaffolder sets up the formwork support above the upper structure. The lower end of the formwork support is first fixed to the grid welded by the upper beam frame and the upper beam frame crossbeam to complete the setting up of the formwork support;

[0016] S6: After the upper structure, lower structure and fixed structure are all installed, the electric control jack is used to lift the formwork support to the target elevation to start the formwork and concrete pouring operations.

[0017] Furthermore, in S6, during the concrete pouring process, attention is always paid to the pressure intensity of each jack. When the pressure exceeds the warning value, the pouring operation is stopped, the construction plan is readjusted and the number of jacks is increased. When the arch ring is formed and the concrete strength reaches %, the formwork is removed. Before removing the formwork, the jack is lowered to separate the formwork from the concrete structure by gravity. After removing the formwork, the jack is lowered to the initial height.

[0018] Furthermore, the direction of the pier that is not under construction is the forward end. At this time, the hoop on the side close to the forward end remains stationary, and the hoop on the other end is separated from the lower beam frame. First, the lower hoop and diagonal brace below are separated from the lower beam frame. Before separation, the tower crane is used to hook the lower beam frame, and the hoop rotating parts at the forward end are rotated. The tower crane auxiliary device is used to rotate around the pier at the forward end. The upper and lower hoops are installed in advance on the adjacent piers that are not under construction at the forward end. The dismantled end of the lower beam frame is connected to the newly erected upper hoop, and then the newly erected lower hoop and diagonal brace are connected to the lower beam frame. The forward transfer work of the entire device is completed.

[0019] Furthermore, after the forward transfer of the device is completed, before making the formwork, check whether the high-strength bolts and welding nodes are firm, whether the connection points of the formwork support are loose due to vibration, whether the jacks can be pushed forward synchronously and whether the readings are normal. After all inspection items have been checked and accepted, continue with the next span construction work.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The multi-span continuous arch bridge arch ring support rapid turnover device and construction method of the present invention, by constructing a detachable upper structure, lower structure and fixed structure on the bridge piers, reduces the workload of repeated erection of frames in the arch ring construction of traditional multi-span continuous arch bridges, ensures the construction progress of the arch ring support structure and concrete pouring, and improves the turnover utilization rate of the frame and the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the overall structure of the device of the present invention;

[0023] Figure 2 It is a schematic diagram of the upper structure of the device of the present invention;

[0024] Figure 3 It is a schematic diagram of the lower structure of the device of the present invention;

[0025] Figure 4 It is a schematic diagram of the fixing structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection between the upper structure and the lower structure of the present invention at the jack position;

[0027] Figure 6 It is a schematic diagram of the end of the upper structure of the present invention;

[0028] Figure 7 It is a three-dimensional effect diagram of the overall structure of the present invention.

[0029] In the figure: 1. formwork support; 2. upper clamp; 3. lower clamp; 4. bridge pier; 5. diagonal brace; 6. lower beam frame; 7. upper beam frame; 8. jack; 9. force transmission beam; 10. upper beam frame cross beam; 11. lower beam frame cross beam; 12. beam frame end limit groove; 201. clamp fixing piece; 202. connecting piece; 203. clamp rotating piece; 204. high-strength bolt. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-7The invention provides a multi-span continuous arch bridge arch ring support rapid turnover device, which is composed of three parts: an upper structure, a lower structure and a fixed structure. Common bridge piers mostly use double piers, and one set of the device is used between adjacent piers in each span, so there are two sets of the device under each arch ring.

[0032] Specifically, the fixing structure in the embodiment of the present invention is an upper hoop 2 and a lower hoop 3. Both the upper hoop 2 and the lower hoop 3 are composed of a hoop fixing part 201, a hoop rotating part 203, a connecting part 202 and a high-strength bolt 204. The hoop fixing part 201 is used to fix with the bridge pier 4. The hoop is tightened on the bridge pier 4 by the high-strength bolt 204. The middle part of the hoop fixing part 201 is recessed inward to set the hoop rotating part 203. The hoop rotating part 203 rotates around the bridge pier 4 and is fastened to the center of the hoop fixing part 201 by the high-strength bolt 204. The connecting part 202 is set at the end of the hoop rotating part 203. The connecting part 202 of the upper hoop 2 is used to connect the lower structure. The connecting part 202 of the lower hoop 3 is used to connect the diagonal brace 5, and the other end of the diagonal brace 5 is fixed to the lower beam frame 6.

[0033] The lower structure in this embodiment is a lower beam frame 6, a lower beam frame cross beam 11, a jack 8 and a force transmission beam 9. The lower beam frame 6 and the lower beam frame cross beam 11 are made of steel. There are two lower beam frames 6 in total, and both ends are fixed to the connecting pieces 202 of the upper clamps 2 on the adjacent piers 4. A lower beam frame cross beam 11 is set every 5 meters between the two lower beam frames 6 to connect and fix the two lower beam frames 6 into an integral structure. The lower beam frame 6 is drilled with holes, and the jack 8 is placed on the upper part, which is connected and fixed by high-strength bolts 204. The number of jacks 8 on the two lower beam frames 6 is the same, and the total number of jacks 8 is determined by the on-site construction load calculation. A force transmission beam 9 is supported above the two groups of jacks 8 at the corresponding positions of the two lower beam frames 6. The force transmission beam 9 is made of I-beam and fixed to the jack 8 by welding.

[0034] The upper structure in this embodiment includes a formwork support 1, an upper beam frame 7, and an upper beam frame cross beam 10. The upper beam frame 7 and the upper beam frame cross beam 10 are made of steel, and the two are vertically staggered and welded to form a whole. The arrangement spacing is designed according to the erection spacing of the formwork support 1 to ensure that the landing point of the formwork support 1 is on the upper beam frame 7 and the upper beam frame cross beam 10. The landing point position is ensured by welding or high-strength bolts 204 to ensure that the formwork support 1 will not shift on the upper beam frame 7 and the upper beam frame cross beam 10.

[0035] Among them, the end of the upper beam frame 7 is not connected to any structure. A beam frame end limit groove 12 is provided above the end of the upper beam frame 7 at the arch foot of the formwork support 1 to ensure that the formwork support 1 will not slide longitudinally and hit the pier 4 structure.

[0036] In the above embodiment, the upper structure and the lower structure are connected into a whole by connecting the force transmission beam 9 and the upper beam frame 7 with high-strength bolts 204 or welding.

[0037] In order to further better explain the embodiments of the present invention, a construction method of a multi-span arch bridge arch ring support rapid turnover device is also provided, comprising the following steps:

[0038] Step 1: Before construction, determine the number of jacks 8, the spacing of the upper beams 7 and the upper beam cross beams 10 of the upper structure assembled into a grid according to the construction plan.

[0039] Step 2: Install the upper clamp 2 and the lower clamp 3 at the positions of adjacent piers 4 respectively, and keep the clamps on the same layer at the same horizontal position.

[0040] Step 3: After all parts of the lower structure are assembled on the ground by high-strength bolts 204 and welding, a tower crane is used to hoist the lower beam frame 6 and fix it with high-strength bolts 204 and connecting pieces 202 , and the lower beam frame 6 is connected to the diagonal brace 5 .

[0041] Step 4: Weld the upper beam frame 7 and the upper beam frame cross beam 10 of the upper structure into a grid form on the ground, hoist them above the force transmission beam 9 and connect them into a whole.

[0042] Step 5: The scaffolder sets up the formwork support 1 above the superstructure. The lower end of the formwork support 1 is first fixed to the grid welded with the upper beam frame 7 and the upper beam frame cross beam 10 to complete the setting up of the formwork support 1.

[0043] Step 6: After the upper structure, lower structure and fixed structure are all installed, the electric control jack 8 is used for lifting operation, and the formwork support 1 is lifted to the target elevation to carry out the formwork and concrete pouring operation. During the concrete pouring process, it is necessary to pay attention to the pressure intensity of each jack 8 at all times. When the pressure exceeds the warning value, the pouring operation should be stopped, the construction plan should be readjusted, and the number of jacks 8 should be increased.

[0044] When the arch ring is formed and the concrete strength reaches 75%, the formwork can be removed. Before the formwork is removed, the formwork and the concrete structure can be separated by gravity by lowering the jack 8. After the formwork is removed, the jack 8 is lowered to the initial height.

[0045] In the above construction process, the direction of the bridge pier that has not been constructed is set as the forward end. At this time, the clamp on the side close to the forward end remains stationary, and the clamp on the other end is separated from the lower beam frame 6. The lower clamp 3 and the diagonal brace 5 below are separated from the lower beam frame 6. Before separation, the tower crane is used to hook the lower beam frame 6 to prevent the device from collapsing. The clamp rotating part 203 at the forward end is rotated, and rotated around the bridge pier 4 at the forward end through the tower crane auxiliary device. The upper clamp 2 and the lower clamp 3 are installed in advance on the adjacent bridge pier 4 that has not been constructed at the forward end. The end of the dismantled lower beam frame 6 is connected to the newly erected upper clamp 2, and the newly erected lower clamp 3 and the diagonal brace 5 are connected to the lower beam frame 6. The forward transfer work of the device is completed.

[0046] After the device is moved forward, before making the template, you should first check whether the high-strength bolts 204 and the welding nodes are firm, whether the connection points of the template support 1 are loose due to vibration, and whether the jack 8 can be pushed forward synchronously and the reading is normal. After all the above inspection items are checked and accepted, the next span construction can be continued. The device on the other half can be carried out in the same way as above.

[0047] In summary: the present invention provides a multi-span continuous arch bridge arch ring support rapid turnover device and its construction method, by constructing a detachable upper structure, lower structure and fixed structure on the pier 4, reducing the workload of repeated erection of the frame during the arch ring construction of the traditional multi-span continuous arch bridge, ensuring the construction progress of the arch ring support structure and concrete pouring, and improving the turnover rate of the frame and the construction efficiency.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A multi-span arch bridge arch ring support rapid turnover device, characterized in that: The invention comprises an upper structure, a lower structure and a fixing structure; the fixing structure comprises an upper clamp (2) and a lower clamp (3) arranged on a bridge pier (4); the upper clamp (2) and the lower clamp (3) are both composed of a clamp fixing part (201), a clamp rotating part (203), a connecting part (202) and a high-strength bolt (204); the clamp fixing part (201) is used to fix to the bridge pier (4), and the clamp is tightened on the bridge pier (4) by the high-strength bolt (204); the clamp fixing part (201) is used to fix to the bridge pier (4), and the high-strength bolt (204) is used to tighten the clamp to the bridge pier ( ... high-strength bolt (204) is used to tighten the clamp to the bridge pier (4); the high-strength bolt (204) is used to tighten the clamp to the bridge pier (4); the high-strength bolt (204) is used to tighten the clamp to the bridge pier (4); 01) is provided with a hoop rotating member (203) inwardly recessed in the middle position, the hoop rotating member (203) rotates around the bridge pier (4) and is fastened to the center position of the hoop fixing member (201) by a high-strength bolt (204); a connecting member (202) is provided at the end of the hoop rotating member (203), the connecting member (202) of the upper hoop (2) is used to connect to the lower structure, and the connecting member (202) of the lower hoop (3) is used to connect to the diagonal brace (5), and the other end of the diagonal brace (5) is connected to the lower beam frame (6) is fixed, and the two ends of the lower beam frame (6) are respectively fixed to the connecting pieces (202) of the upper hoop (2) on the adjacent pier (4); the lower structure comprises a lower beam frame (6), a lower beam frame cross beam (11), a jack (8) and a force transmission beam (9); there are two lower beam frames (6) in total, and a lower beam frame cross beam (11) is arranged every five meters between the two lower beam frames (6) to connect and fix the two lower beam frames (6) into an integral structure; the jack (8) installs the lower beam frame ( 6) and are connected and fixed by high-strength bolts (204); two groups of jacks (6) at corresponding positions of the two lower beam frames (6) jointly support a force transmission beam (9); the upper structure includes a template support (1), an upper beam frame (7) and an upper beam frame cross beam (10); the upper beam frame (7) and the upper beam frame cross beam (10) are vertically staggered and welded to form a whole; the landing point of the template support (1) is fixed to the upper beam frame (7) and the upper beam frame cross beam (10) by welding.

2. The multi-span arch bridge arch ring support rapid turnover device according to claim 1, characterized in that: The upper beam frame (7) and the upper beam frame cross beam (10) are made of steel sections, and the arrangement spacing between the upper beam frame (7) and the upper beam frame cross beam (10) is determined according to the erection spacing of the formwork support (1).

3. The multi-span arch bridge arch ring support rapid turnover device according to claim 1, characterized in that: The end of the upper beam frame (7) is not connected to any structure, and a beam frame end limit groove (12) is provided above the end of the upper beam frame (7) at the arch foot of the formwork support (1) for preventing the formwork support (1) from longitudinally sliding.

4. The multi-span arch bridge arch ring support rapid turnover device according to claim 1, characterized in that: The upper structure and the lower structure are connected into a whole by using high-strength bolts (204) or welding to connect the force transmission beam (9) and the upper beam frame (7).

5. The multi-span arch bridge arch ring support rapid turnover device according to claim 1, characterized in that: The lower beam frame (6) and the lower beam frame cross beam (11) are made of steel sections. The number of jacks (8) on the two lower beam frames (6) is the same, and the total number of jacks (8) is determined by on-site construction load calculation.

6. The multi-span arch bridge arch ring support rapid turnover device according to claim 1, characterized in that: The force transmission beam (9) is made of I-beam and is fixed to the jack (8) by welding.

7. A construction method for the rapid turnover device for arch ring supports of a multi-span arch bridge as claimed in claim 1, characterized in that: The following steps are involved: S1: Before construction, determine the number of jacks (8), the spacing between the upper beam frame (7) of the upper structure and the upper beam frame cross beam (10) assembled into a grid according to the construction plan; S2: installing the upper clamp (2) and the lower clamp (3) at the positions of adjacent bridge piers (4) respectively, and the clamps at the same layer are kept at the same horizontal position; S3: After assembling all parts of the lower structure on the ground by high-strength bolts (204) and welding, use a tower crane to hoist the lower beam frame (6), and fix it with high-strength bolts (204) and connecting pieces (202), and the lower beam frame (6) is connected to the diagonal brace (5); S4: welding the upper beam frame (7) and the upper beam frame cross beam (10) of the upper structure into a grid form on the ground, hoisting them above the force transmission beam (9) and connecting them into a whole; S5: The scaffolder sets up the formwork support (1) above the upper structure, and the lower end of the formwork support (1) is first fixed to the grid frame welded to the upper beam frame (7) and the upper beam frame cross beam (10), and the setting up of the formwork support (1) is completed; S6: After the upper structure, lower structure and fixed structure are all installed, the electric control jack (8) performs a lifting operation to lift the formwork support (1) to the target elevation, and then the formwork and concrete pouring operations can be carried out.

8. The construction method of the rapid turnover device for arch ring supports of a multi-span continuous arch bridge according to claim 7, characterized in that: In S6, during the concrete pouring process, the pressure intensity of each jack (8) is always paid attention to. When the pressure exceeds the warning value, the pouring operation is stopped, the construction plan is readjusted and the number of jacks (8) is increased. When the arch ring is formed and the concrete strength reaches 75%, the formwork is removed. Before the formwork is removed, the jack (8) is lowered to separate the formwork from the concrete structure by gravity. After the formwork is removed, the jack (8) is lowered to the initial height.

9. The construction method of the rapid turnover device for arch ring supports of a multi-span continuous arch bridge according to claim 7, characterized in that: The direction of the bridge pier that has not been constructed is the forward end. At this time, the clamp on the side close to the forward end remains stationary, and the clamp on the other end is separated from the lower beam frame (6). The lower clamp (3) and the diagonal brace (5) below are separated from the lower beam frame (6). Before separation, the tower crane is used to hook the lower beam frame (6), and the clamp rotating part (203) at the forward end is rotated. The clamp rotating part (203) is rotated around the bridge pier (4) at the forward end through the tower crane auxiliary device. The upper clamp (2) and the lower clamp (3) are installed in advance on the adjacent bridge pier (4) that has not been constructed at the forward end. The end of the dismantled lower beam frame (6) is connected to the newly erected upper clamp (2), and then the newly erected lower clamp (3) and the diagonal brace (5) are connected to the lower beam frame (6). The forward transfer work of the entire device is completed.

10. The construction method of the rapid turnover device for arch ring supports of a multi-span arch bridge according to claim 9, characterized in that: After the forward transfer of the device is completed, before making the template, check whether the high-strength bolts (204) and welding nodes are firm, whether the connection points of the template support (1) are loose due to vibration, whether the jack (8) can be pushed forward synchronously and whether the reading is normal. After all the inspection items are checked and accepted, continue the next span construction work.

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