Guy rope type bracket for 0 # block construction of single-tower wide tower beam consolidation area

Abstract

The invention relates to a guy cable type bracket for 0 # block construction of a single-tower wide tower beam consolidation area. The guy cable type bracket comprises two trusses, a plurality of main bailey beams, a guy cable anchor box, a plurality of guy cables and a plurality of distribution beams. The two trusses are fixedly arranged on the two side walls of the bridge tower in the bridge direction respectively, the multiple main bailey beams are erected on the two trusses on the two sides of the bridge tower in the transverse bridge direction respectively, and the joists are welded between the bottom faces of the ends of the main bailey beams on the two sides of the bridge tower in the bridge direction respectively in the bridge direction. The inhaul cable anchor box is fixedly arranged at the top of the bridge tower; and an inhaul cable is connected between each of the two ends of each joist and the anchor box. The inhaul cable is arranged to buckle and hang the bracket cantilever, the bracket structure is good in balance and stability, the construction safety can be guaranteed, the cable force of the inhaul cable can be adjusted in real time according to the load change and deformation condition of the bracket in the construction process, and the linear precision of the 0 # block can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and relates to the construction of a 0# block in a tower-beam consolidation zone of a cable-stayed bridge, and specifically to a guy-cable type bracket for the construction of a 0# block in a wide tower-beam consolidation zone of a single tower. Background Art

[0002] During the pouring construction of the 0# block of the consolidation area of ​​the tower beam of the cable-stayed bridge, it is relatively high from the ground, so it is more suitable to use bracket construction. However, conventional brackets are more suitable for double-limb bridge towers. The bracket is erected between the two tower limbs, and the balance and stability are easier to control. For example, the bracket involved in the reaction preloading device of the triangular bracket of the 0# block of a large cantilever and short tower cable-stayed bridge in water in patent CN221142486U is used on the double-limb bridge tower. For a single-tower cable-stayed bridge, if a bracket is used for the construction of the 0# block of the tower beam consolidation area, the cantilevers at both ends of the bracket are relatively long. When the bridge width is wide, the bracket needs to be widened, and the stability and safety of the bracket are not easy to control. Therefore, a floor bracket is currently mostly used, or a floor bracket is combined with a bracket. For example, patent CN221589305U discloses a bracket support system beside the pier for the construction of the tower beam section of a cable-stayed bridge, which is a structure combining a floor bracket and a bracket, in which two sets of floor support frames are symmetrically arranged at the bottom of the bracket to assist the bracket. The floor-standing bracket generally adopts the structure of steel pipe piles and flat joints, which not only consumes a lot of materials and has high cost, but also has high requirements on the bearing capacity of the foundation. When the bearing capacity of the foundation is insufficient, the steel pipe is prone to sinking. In addition, when the tower body is high, the slenderness ratio of the steel pipe is large and it is easy to be compressed and deformed, which in turn affects the linear accuracy of the 0# block. Summary of the invention

[0003] The purpose of the present invention is to provide a cable-stayed bracket for the construction of the 0# block in the tower-beam consolidation zone of a single-tower wide-width tower-beam, and to apply the bracket to the construction of the 0# block in the tower-beam consolidation zone of a single-tower cable-stayed bridge to reduce costs and ensure construction safety.

[0004] The technical solution of the present invention is as follows:

[0005] A cable-stayed bracket for the construction of the 0# block in the consolidation zone of a single-tower wide-width tower beam, characterized in that it comprises two trusses, a plurality of main Bailey beams, a plurality of auxiliary Bailey beams, a cable anchor box, a plurality of cables, and a plurality of distribution beams;

[0006] Two trusses are respectively arranged on the two side walls of the bridge tower in the direction of the bridge, the length of the truss is not less than the length of the 0# block in the tower beam consolidation zone in the direction of the bridge, a row of brackets are respectively fixed on the two side walls of the bridge tower in the direction of the bridge, the bottoms of the two trusses are respectively supported on the two rows of brackets, and at least one limit rod is respectively welded between the two trusses on both sides of the bridge tower in the transverse direction of the bridge;

[0007] A plurality of main Bailey beams are respectively erected on two trusses in the transverse direction on both sides of the bridge tower in the transverse direction, the length of the main Bailey beam is not less than the width of the 0# block in the transverse direction of the tower beam consolidation zone, and a support beam is respectively welded in the transverse direction between the bottom surfaces of the ends of each main Bailey beam on both sides of the bridge tower in the transverse direction;

[0008] A plurality of auxiliary Bailey beams are respectively erected on the trusses and the supporting beams along the two side walls of the bridge facing the bridge tower and in a direction parallel to the main Bailey beams;

[0009] The cable anchor box is fixedly arranged on the top of the bridge tower;

[0010] The two ends of each joist are respectively connected to the anchor box with one of the cables, the middle of each joist is connected to the anchor box with at least one cable, the lower end of each cable is anchored to the joist, and the upper end of each cable is a tensioning end, which is anchored to the anchor box;

[0011] Multiple distribution beams are erected along the bridge direction on the main Bailey beams and auxiliary Bailey beams, and the 0# casting formwork of the tower beam consolidation area is installed on the distribution beams.

[0012] According to a specific embodiment of the present invention, the cross section of the truss is a right triangle, one of the two perpendicular faces of the truss faces the tower wall, and the other face is the top face and is parallel to the horizontal plane.

[0013] Furthermore, two ends of the outer sides of the top surface of each truss are respectively connected to the anchor box by a cable.

[0014] The bracket of the present invention adopts a structural form that combines a truss beam and a Bailey beam, has a strong bearing capacity, and at the same time, a cable is arranged to hang the bracket cantilever. The bracket structure has good balance and stability, and can ensure construction safety. During the construction process, the cable force can be adjusted in real time according to the load change and deformation of the bracket to ensure the linear accuracy of the 0# block. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the transverse bridge elevation structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention in a side view along the bridge direction;

[0017] Figure 3 It is a schematic diagram of the planar structure of the present invention. DETAILED DESCRIPTION

[0018] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention comprises two trusses 1, a plurality of main Bailey beams 2, a plurality of auxiliary Bailey beams 3, a cable anchor box 4, a plurality of cables 5, and a plurality of distribution beams 6;

[0019] Two trusses 1 are respectively arranged on the two side walls of the bridge tower 10 along the bridge direction, the length of the truss is not less than the length of the 0# block of the tower beam consolidation zone along the bridge direction, a row of brackets 7 are respectively fixed on the two side walls of the bridge tower along the bridge direction, the bottoms of the two trusses 1 are respectively supported on the two rows of brackets, and at least one limit rod 8 is respectively welded between the two trusses 1 on both sides of the bridge tower in the transverse direction of the bridge;

[0020] A plurality of main Bailey beams 2 are respectively erected on two trusses 1 in the transverse direction on both sides of the bridge tower, the length of the main Bailey beam is not less than the width of the 0# block in the transverse direction of the tower beam consolidation area, and a support beam 9 is respectively welded in the transverse direction between the bottom surfaces of the ends of each main Bailey beam 2 on both sides of the bridge tower;

[0021] A plurality of auxiliary Bailey beams 3 are respectively erected on the truss 1 and the supporting beam 9 along the two side walls of the bridge facing the bridge tower in a direction parallel to the main Bailey beam;

[0022] The cable anchor box 3 is fixedly arranged on the top of the bridge tower 10;

[0023] Each joist 9 has two ends connected to the anchor box 3 by a cable 5, and the middle of each joist 9 has at least one cable 5 connected to the anchor box 4. The lower end of each cable 5 is anchored to the joist 9, and the upper end of each cable is a tensioning end, which is anchored to the anchor box 4.

[0024] A plurality of distribution beams 6 are erected on each main Bailey beam 2 and auxiliary Bailey beam along the bridge direction, and a casting formwork of the 0# block of the tower beam consolidation zone is installed on the distribution beam 5.

[0025] In the above structure, the cable 4 provides an upward pulling force to the bracket cantilever, which can effectively prevent the bracket cantilever end from bending downward, ensure the overall structural stability of the bracket, and ensure that the bracket meets the bearing capacity requirements of 0# block construction.

[0026] Conventional brackets, due to the obstruction of the tower body, can usually only set up load-bearing beams on both sides of the bridge tower, and set up distribution beams between the load-bearing beams on both sides of the bridge tower. When the cross-section of the bridge tower is large, the distance between the load-bearing beams on both sides is large, and there is a lack of support in the middle of the distribution beam, which may cause deflection and affect the linear shape of the 0# block.

[0027] The main Bailey beam of the present invention is equivalent to the load-bearing beam of a conventional bracket and can only be set up on both sides of the bridge tower. In view of the above problem, the present invention sets a plurality of auxiliary Bailey beams between the main Bailey beams on both sides. The auxiliary Bailey beams and the main Bailey beams jointly support the distribution beam 5, which can effectively avoid the problem of deflection in the middle of the distribution beam.

[0028] The function of the joist is to provide an anchor point for the cable and to provide support for the auxiliary Bailey beam. To ensure that the joist has sufficient support, at least one cable is arranged between the middle of each joist and the anchor box.

[0029] The truss 1 can be a steel structure truss with a right triangle cross section. When the truss is installed on the bridge tower, one of its two perpendicular faces faces the tower wall, and the other face is the top face and is parallel to the horizontal plane.

[0030] Since the truss cantilever is relatively long, in order to prevent the two ends of the truss from bending downward and deforming, a cable 5 can be connected between the two ends of the outer side of the top surface of each truss 1 and the anchor box 4 respectively.

[0031] Taking the construction of the 0# block in the consolidation zone of a certain variable-section single-tower beam as an example, the construction method of the guy-cable bracket of the present invention is as follows:

[0032] (1) During the construction of the bridge tower 10, the finely rolled threaded reinforcement is pre-embedded at the designed installation position of the bracket on the bridge tower as a bracket connector. When the bracket 7 is installed, the finely rolled threaded reinforcement is tensioned to the design load;

[0033] (2) After the construction of the bridge tower is completed, the section above the 0# block in the tower beam consolidation area is hoisted by a tower crane to the installation position. Since the tower body has a variable cross-section, it is necessary to set a spacer between the truss and the tower wall to ensure that the truss is tightly pressed against the tower body. Then, a limit rod 8 is welded between the two trusses to ensure the connection between the two trusses and prevent the truss from tilting and longitudinal displacement.

[0034] (3) Install the main Bailey beam 2 and the auxiliary Bailey beam 3 on the truss, and set up the distribution beam 6;

[0035] (4) Install a fixed cable anchor box 4 on the top of the tower;

[0036] (5) Install cables 5 between the joist 9, the truss 1 and the anchor box 4, and pre-tension the cables at the top of the tower;

[0037] (6) Bracket preloading: During the preloading process, as the preloading load increases, the tension of the cable can be adjusted according to the design value to ensure that the line shape of the bracket top surface meets the design requirements.

[0038] (7) After the bracket is inspected and qualified, the formwork is installed, the 0# steel bars are tied, and concrete is poured to start the construction of the 0# block 11 of the tower beam consolidation area. During the construction process, the bracket is monitored in real time to see if it is deformed. Once deformation occurs, the bracket is adjusted at any time by adjusting the tension of the cable. After the 0# block construction is completed, the bracket is removed and the upper section of the bridge tower is poured.

Claims

1. A cable-stayed bracket for the construction of the 0# block in the consolidation zone of a single-tower wide-width tower beam, characterized in that: It includes two trusses, a plurality of main Bailey beams, a plurality of auxiliary Bailey beams, a cable anchor box, a plurality of cables, and a plurality of distribution beams; Two trusses are respectively arranged on the two side walls of the bridge tower in the direction of the bridge, the length of the truss is not less than the length of the 0# block in the tower beam consolidation zone in the direction of the bridge, a row of brackets are respectively fixed on the two side walls of the bridge tower in the direction of the bridge, the bottoms of the two trusses are respectively supported on the two rows of brackets, and at least one limit rod is respectively welded between the two trusses on both sides of the bridge tower in the transverse direction of the bridge; A plurality of main Bailey beams are respectively erected on two trusses in the transverse direction on both sides of the bridge tower in the transverse direction, the length of the main Bailey beam is not less than the width of the 0# block in the transverse direction of the tower beam consolidation zone, and a support beam is respectively welded in the transverse direction between the bottom surfaces of the ends of each main Bailey beam on both sides of the bridge tower in the transverse direction; A plurality of auxiliary Bailey beams are respectively erected on the trusses and the supporting beams along the two side walls of the bridge facing the bridge tower and in a direction parallel to the main Bailey beams; The cable anchor box is fixedly arranged on the top of the bridge tower; The two ends of each joist are respectively connected to the anchor box with one of the cables, the middle of each joist is connected to the anchor box with at least one cable, the lower end of each cable is anchored to the joist, and the upper end of each cable is a tensioning end, which is anchored to the anchor box; Multiple distribution beams are erected along the bridge direction on the main Bailey beams and auxiliary Bailey beams, and the 0# casting formwork of the tower beam consolidation area is installed on the distribution beams.

2. The guy-cable bracket for construction of block 0 in the consolidation zone of a single-tower wide-width tower beam according to claim 1 is characterized in that: The cross section of the truss is a right triangle, one of the two mutually perpendicular faces of the truss faces the tower wall, and the other face is the top face and is parallel to the horizontal plane.

3. The guy-cable bracket for construction of block 0 in the consolidation zone of a single-tower wide-width tower beam according to claim 2 is characterized in that: Two ends of the outer sides of each truss top surface are respectively connected to the anchor box with a cable.

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