A kind of annular prestressed steel bundle fixing device and construction method thereof

Abstract

The present invention discloses a ring-shaped prestressed steel bundle fixing device and a construction method thereof, wherein the fixing device comprises a base steel plate bracket, a linear positioning plate, a steel belt fixing clamp, a steel bundle end fixing device, a prestressed pipe, a lifting ring and a positioning steel bar through hole, wherein the linear positioning plate is welded to the base steel plate bracket, the prestressed pipe is fixed between the base steel plate bracket and the linear positioning plate by a steel belt fixing clamp, the prestressed steel bundle passes through the prestressed pipe, and both ends are fixed to the base steel plate bracket by a steel bundle end fixing device, a plurality of positioning steel bar through holes are provided on the base steel plate bracket, and a lifting ring is provided on the top of the base steel plate bracket. The present invention can complete the threading and curve positioning of the prestressed steel bundle on the ground, greatly reducing the high-altitude operation time on the tower, reducing the construction difficulty, improving the work efficiency and ensuring the construction quality, and has a simple structure, low cost and can be recycled.

Description

Technical Field

[0001] The invention relates to the field of bridge structure construction, and in particular to a ring-shaped prestressed steel bundle fixing device and a construction method thereof. Background Art

[0002] At present, the tower ends of concrete cable-stayed bridges are usually anchored by three methods: steel anchor box anchoring, steel anchor beam anchoring and annular prestressed anchoring. Compared with steel anchor beam and steel anchor box anchoring, annular prestressed anchoring is simple to construct, has a wide range of applications, significant economic advantages, and less later maintenance workload, so it has a wide range of engineering applications.

[0003] The main construction difficulties of annular prestressed anchoring are the high-altitude bundle threading operation and the curve positioning of the annular prestressed steel strands. Since the curve radius of the annular prestressed steel strands is small, the bundle threading before concrete pouring is likely to cause the prestressed pipe to shift and the prestressed pipe to be punctured during the bundle threading process. After concrete pouring, the bundle threading is likely to be difficult. During the bundle threading process, the prestressed steel strands are likely to overlap and tangle in the curved section. In addition, the high-altitude bundle threading operation is difficult, risky, time-consuming, and labor-intensive, and affects the construction progress. Summary of the invention

[0004] The present invention is proposed to solve the problems existing in the existing construction technology of annular prestressing of cable-stayed bridge towers, and its purpose is to provide an annular prestressing steel bundle fixing device. The technical solution is as follows:

[0005] A ring-shaped prestressed steel bundle fixing device comprises a base steel plate support, a linear positioning plate, a steel belt fixing clamp, a steel bundle end fixing device, a prestressed pipe, a lifting ring and a positioning steel bar through hole, wherein the linear positioning plate is welded to the base steel plate support, the prestressed pipe is fixed between the base steel plate support and the linear positioning plate by the steel belt fixing clamp, the prestressed steel bundle passes through the prestressed pipe, and both ends are fixed to the base steel plate support by the steel bundle end fixing device, a plurality of positioning steel bar through holes are opened on the base steel plate support, and a lifting ring is provided on the top of the base steel plate support.

[0006] Furthermore, the setting trajectory of the linear positioning plate is consistent with the setting trajectory of the prestressed pipe, and an arc chamfer is provided on the inner side of the linear positioning plate, and the radius of the arc chamfer is equal to the outer diameter of the prestressed pipe.

[0007] Furthermore, the base steel plate support is a support structure including a plurality of triangular support frames formed by auxiliary support beams and guide supports, wherein the guide supports are consistent with the setting trajectory of the linear positioning plate and the prestressed pipe.

[0008] Furthermore, the auxiliary support beam and the guide bracket form the base steel plate bracket including a plurality of triangular support frames.

[0009] Furthermore, after the linear positioning plate is fixed to the base steel plate bracket, the cross-section is L-shaped or T-shaped.

[0010] Furthermore, the steel belt fixing clamp is in the shape of a flat belt, with a fixed pin shaft at one end and a movable pin shaft at the other end.

[0011] Furthermore, the prestressed pipe may be a metal corrugated pipe, an iron pipe or a plastic pipe.

[0012] Furthermore, the steel bundle end fixing device is a simple and detachable temporary anchor.

[0013] Furthermore, the prestressed steel bundle fixing device is recycled as a temporary structure or welded to the rigid frame inside the tower as a permanent structure.

[0014] Furthermore, the prestressed steel strand is a U-shaped, L-shaped or other annular curved prestressed steel strand.

[0015] The present invention also provides a construction method for the above-mentioned annular prestressed steel bundle fixing device, comprising the following steps: (1) designing the shape of the base steel plate bracket and the linear positioning plate of the fixing device into the prestressed shape to be fixed, first arranging the prestressed pipeline along a straight line, and then inserting each steel bar in the prestressed steel bundle into the prestressed pipeline in turn and applying a pre-tightening force, wherein the pre-tightening force is preferably such that the prestressed steel bundle is just tightened;

[0016] (2) Place the prestressed pipe close to the linear positioning plate, and bend the prestressed pipe along the linear positioning plate to make the two fit closely;

[0017] (3) Fix the end of the prestressed steel bundle using the steel bundle end fixing device, then buckle the steel belt fixing clip into the movable pin hole of the fixing clip and insert the pin to fix the prestressed pipe;

[0018] (4) Insert the tower crane cable into the lifting point, adjust the horizontality of the temporary fixing device, lift it to the designed position of the prestressed steel bundle of the bridge tower, pass the positioning steel bar of the prestressed pipe through the positioning steel bar through-hole and firmly weld it to the bridge tower steel bar;

[0019] (5) Release the fixing device at the end of the steel bundle, disassemble the steel belt fixing clamps in turn, and then use the tower crane to lift out the temporary fixing device to temporarily fix and lift the next prestressed steel bundle.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention uses a prestressed steel bundle fixing device to complete the threading and curve positioning of U-shaped, L-shaped or other annular curved prestressed steel strands on the ground, avoiding high-risk and difficult high-altitude threading operations, avoiding the twisting of steel strands, the inability of steel strands to be inserted (threading after concrete pouring), and the puncture of pipes by steel bars (threading before concrete pouring) during the threading process. The prestressed steel bundle curve positioning operation on the ground can be carried out simultaneously with the steel bar binding operation on the tower, which greatly reduces the high-altitude operation time on the tower, reduces the construction difficulty, improves work efficiency and ensures construction quality. The fixing device of the structure of the present invention has low cost, simple operation, and can be recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the annular prestressed steel bundle fixing device of the present invention;

[0022] Figure 2 The present invention Figure 1 Schematic diagram of cross section of middle II;

[0023] Figure 3 It is a three-dimensional schematic diagram of the overall structure of the annular prestressed steel bundle fixing device of the present invention;

[0024] Figure 4 It is a schematic diagram of ground construction steps of the present invention.

[0025] In the figure:

[0026] 1. Base steel plate bracket 2. Linear positioning plate 3. Steel belt fixing clamp 4. Steel bundle end fixing device

[0027] 5. Prestressed pipe 6. Prestressed steel strand 7. Lifting ring 8. Positioning steel bar through hole

[0028] 9. Fixed pin 10. Movable pin 11. Pin DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0030] The present invention discloses an annular prestressed steel bundle fixing device, comprising a base steel plate support 1, a linear positioning plate 2, a steel belt fixing clamp 3, a steel bundle end fixing device 4, a prestressed pipe 5, a lifting ring 7 and a positioning steel bar passing hole 8, wherein the linear positioning plate 2 is welded to the base steel plate support 1, the prestressed pipe 5 is fixed between the base steel plate support 1 and the linear positioning plate 2 by the steel belt fixing clamp 3, the prestressed steel bundle 6 passes through the prestressed pipe 5, and both ends are fixed to the base steel plate support 1 by the steel bundle end fixing device 4, a plurality of positioning steel bar passing holes 8 are provided on the base steel plate support 1, which are used for passing the positioning steel bars of the prestressed pipe and fixing the prestressed pipe to the steel bars of the bridge tower; a lifting ring 7 is provided on the top of the base steel plate support 1 for lifting the above-mentioned fixing device.

[0031] The base steel plate support 1 includes a guide support and an auxiliary support beam. In order to ensure the stability of the fixing device, the auxiliary support beam and the guide support form the base steel plate support structure including a plurality of triangular support frames (the function of which is to ensure structural stability).

[0032] In actual operation, the base steel plate support 1, the linear positioning plate 2 and the setting trajectory of the prestressed pipe 5 to be set are consistent. The prestressed pipe 5 is first arranged along a straight line, and then each steel bar in the prestressed steel bundle 6 is inserted into the prestressed pipe 5 in turn and a pre-tightening force is applied. The pre-tightening force is preferably such that the prestressed steel bundle 6 is just tightened. Then the prestressed pipe 5 is pressed against the linear positioning plate 2, and the prestressed pipe 5 is bent along the linear positioning plate 2 so that the two fit tightly.

[0033] Preferably, in order to facilitate fixation, the cross-section of the linear positioning plate 2 is L-shaped or T-shaped after being fixed to the base steel plate bracket 1; the steel belt fixing clamp 3 is a flat belt, with a fixed pin 9 at one end and a movable pin 10 at the other end, and the movable pin 10 is connected to the linear positioning plate 2 through a pin 11; the prestressed pipe can be a metal corrugated pipe, an iron pipe or a plastic pipe; the steel bundle end fixing device is a simple and detachable temporary anchor.

[0034] The above-mentioned prestressed steel bundle fixing device can be used to fix one or more prestressed pipes 5, and is suitable for U-shaped, L-shaped or other annular curved prestressed steel bundles, and can be recycled as a temporary structure or welded to the rigid frame inside the tower as a permanent structure.

[0035] Example 1

[0036] like Figures 1 to 4As shown, this embodiment provides a temporary fixing device for a U-shaped prestressed steel bundle 6, comprising a base steel plate bracket 1, a linear positioning plate 2, a steel belt fixing clamp 3, a steel bundle end fixing device 4, a prestressed pipe 5, a lifting ring 7 and a positioning steel bar through hole 8, wherein the linear positioning plate 2 is welded to the base steel plate bracket 1, and the cross section is T-shaped after being fixed with the base steel plate bracket, the prestressed pipe 5 is tightly fitted with the linear positioning plate 2, the prestressed pipe 5 is fixed to the base steel plate bracket 1 by the steel belt fixing clamp 3, the part of the end of the prestressed steel bundle 6 extending out of the prestressed pipe 5 is fixed to the base steel plate bracket 1 by the steel bundle end fixing device 4, a lifting ring 7 is provided on the top of the base steel plate bracket 1 for lifting the above-mentioned temporary fixing device, and a plurality of positioning steel bar through holes 8 are provided on the base steel plate bracket 1 for passing the positioning steel bars of the prestressed pipe and fixing the prestressed pipe to the bridge tower steel bars.

[0037] The plane layout of the linear positioning plate 2 in this embodiment is consistent with the design line of the prestressed pipe 5, and the cross section is L-shaped, with an arc chamfer on the inside, and the chamfer radius is consistent with the outer diameter of the prestressed pipe 5. The prestressed pipe 5 is a metal corrugated pipe; the steel bundle end fixing device 4 is a simple and detachable temporary anchor.

[0038] The specific construction method of the temporary fixing device of the U-shaped prestressed steel strand 6 of this embodiment 1 is as follows:

[0039] The prestressed pipe 5 is first arranged along a straight line, and then each steel bar in the prestressed steel bundle 6 is sequentially inserted into the prestressed pipe 5 and a pretightening force is applied. The pretightening force is preferably such that the prestressed steel bundle 6 is just tightened. Then the prestressed pipe 5 is pressed against the linear positioning plate 2, and the prestressed pipe 5 is bent along the linear positioning plate 2 so that the two fit closely. After that, the end of the prestressed steel bundle 6 is fixed by the steel bundle end fixing device 4, and then the steel belt fixing clamp 3 is buckled and combined in the fixing clamp movable pin hole 11 and the pin 12 is inserted in turn to fix the prestressed pipe 5. The tower crane cable is inserted into the lifting point 7, the horizontality of the temporary fixing device is adjusted, and it is hoisted to the designed position of the U-shaped prestressed steel bundle 6 of the bridge tower, and the positioning steel bars of the prestressed pipe 5 are passed through the positioning steel bar passing hole 8 and firmly welded to the bridge tower steel bar, the steel bundle end fixing device 4 is released, and the steel belt fixing clamp 3 is disassembled in turn, and then the temporary fixing device is hoisted out by the tower crane, and the next bundle of U-shaped prestressed steel bundles is temporarily fixed and hoisted.

[0040] Embodiment 1 of the present invention uses a temporary fixing device for U-shaped prestressed steel bars to complete the threading and curve positioning of U-shaped prestressed steel bars on the ground, avoiding high-risk and high-difficulty high-altitude threading operations, avoiding the twisting of steel strands, the inability of steel strands to penetrate (threading after concrete pouring), and the puncture of pipes by steel bars (threading before concrete pouring) during the threading process. The prestressed steel bar curve positioning operation on the ground can be carried out simultaneously with the steel bar binding operation on the tower, which greatly reduces the high-altitude operation time on the tower, reduces the construction difficulty, improves work efficiency and ensures the construction quality. At the same time, the fixing device is not only low in cost and simple to operate, but also can be recycled.

[0041] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A ring-shaped prestressed steel bundle fixing device, comprising a base steel plate support (1), a linear positioning plate (2), a steel belt fixing clamp (3), a steel bundle end fixing device (4), a prestressed pipe (5), a lifting ring (7) and a positioning steel bar through hole (8), Features: The linear positioning plate (2) is welded to the base steel plate bracket (1); the prestressed pipe (5) is fixed between the base steel plate bracket (1) and the linear positioning plate (2) by means of a steel belt fixing clamp (3); the prestressed steel bundle (6) passes through the prestressed pipe (5); both ends are fixed to the base steel plate bracket (1) by means of a steel bundle end fixing device (4); a plurality of positioning steel bar passing holes (8) are provided on the base steel plate bracket (1); and a lifting ring (7) is provided on the top of the base steel plate bracket (1); after the linear positioning plate (2) is fixed to the base steel plate bracket (1), the cross section is L-shaped or T-shaped; The arrangement trajectory of the linear positioning plate (2) is consistent with the arrangement trajectory of the prestressed pipe (5), and an arc chamfer is arranged on the inner side of the linear positioning plate (2), and the radius of the arc chamfer is equal to the outer diameter of the prestressed pipe (5); The base steel plate support (1) is a support structure including a plurality of triangles formed by an auxiliary support beam and a guide support, wherein the guide support is arranged in a consistent trajectory with the linear positioning plate (2) and the prestressed pipe (5); The steel belt fixing clamp (3) is in the shape of a flat belt, with a fixed pin shaft (9) provided at one end and a movable pin shaft (11) provided at the other end.

2. The annular prestressed steel strand fixing device according to claim 1, Features: The prestressed pipe (5) may be a metal corrugated pipe, an iron pipe or a plastic pipe.

3. The annular prestressed steel strand fixing device according to claim 1, Features: The steel bundle end fixing device (4) is a simple and detachable temporary anchor.

4. The annular prestressed steel strand fixing device according to claim 1, Features: The prestressed steel bundle fixing device is cyclically used as a temporary structure or welded to the rigid frame inside the tower as a permanent structure.

5. The annular prestressed steel strand fixing device according to claim 1, Features: The prestressed steel strand (6) is a U-shaped, L-shaped or other annular curved prestressed steel strand.

6. The construction method of the annular prestressed steel strand fixing device according to claim 1, Features: The method comprises the following steps: (1) designing the shape of the base steel plate bracket and the linear positioning plate of the fixing device into the prestressed shape to be fixed, firstly arranging the prestressed pipe along a straight line, and then sequentially inserting each steel bar in the prestressed steel bundle into the prestressed pipe and applying a pre-tightening force, wherein the pre-tightening force is preferably such that the prestressed steel bundle is just tightened; (2) Place the prestressed pipe close to the linear positioning plate, and bend the prestressed pipe along the linear positioning plate to make the two fit closely; (3) Fix the end of the prestressed steel bundle using the steel bundle end fixing device, then buckle the steel belt fixing clips into the movable pin holes of the fixing clips and insert the pins to fix the prestressed pipe; (4) Insert the tower crane cable into the lifting point, adjust the horizontality of the temporary fixing device, lift it to the designed position of the prestressed steel strand of the bridge tower, pass the positioning steel bar of the prestressed pipe through the positioning steel bar through-hole and firmly weld it to the bridge tower steel bar; (5) Release the fixing device at the end of the steel bundle, disassemble the steel belt fixing clamps one by one, and then use the tower crane to lift out the temporary fixing device to temporarily fix and lift the next prestressed steel bundle.

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