A pier top index back-pulling method bridge rectification and reset system and construction method

Abstract

The application discloses a pier top index back pulling method bridge deviation rectification reset system and a construction method. The pier top index back pulling method bridge deviation rectification reset system comprises a bridge head combined stand anchoring device, a force providing device for providing reset load, a tension conversion device, a deviation rectification steel strand and a pier top anchoring device. The bridge head combined stand anchoring device provides strong anchoring force by combining and reinforcing adjacent multiple corrugated guardrail plate stands at the bridge head into a whole. The tension conversion device realizes axial transmission between the traction force and the anchoring reaction force, can stabilize the spatial posture of the tension conversion device, and can effectively prevent the deviation rectification steel strand from being sheared and damaged due to overturning of the conversion device in the deviation rectification process. The tension conversion device is provided with multiple extrusion anchor head force transmission holes, and the number of steel strands is installed according to the size of the traction force. The device is simple, convenient to operate, provides stable, gentle and linear traction force, does not disturb the soil body, and has low operation risk.

Description

Technical Field

[0001] This invention relates to the field of bridge alignment technology, and in particular to a bridge alignment and repositioning system and construction method using the pier top index pullback method. Background Technology

[0002] With the development of highway construction, more and more bridges are being used in highway construction. Bridge piers, as an important component of bridges, are the substructure bearing members that support the superstructure and play a crucial role in the overall structural performance and stability of the bridge. Affected by factors such as construction, unbalanced earth pressure, and steep longitudinal slopes of high piers, bridge piers may experience longitudinal and lateral displacement, affecting the safe operation of the bridge. To ensure the overall safety of the bridge structure, timely correction of bridge pier displacement is necessary.

[0003] Currently, there are two existing bridge alignment correction methods: tension correction and thrust correction. The reaction force is provided by devices such as anchor cables-grouting-soil layers, concrete anchors-soil layers, pile foundations, and steel reaction frames. Installing these reaction force devices requires a large working space and necessitates drilling into the soil (rock), causing soil disturbance and posing a risk of secondary damage. Furthermore, in existing anchor cable-steel strand alignment and resetting systems, a tension conversion device is required when connecting the force-generating device to the alignment steel strand. A common method is to anchor the alignment steel strand to a steel block, with the other end secured to the force-generating device using a steel strand loop. This method, because it does not restrict the rotation of the steel block, allows it to easily rotate during tension correction, preventing axial transmission between the traction force and the anchoring reaction force, and potentially causing shear failure of the alignment steel strand.

[0004] In summary, current bridge correction devices suffer from problems such as complex design, inconvenient construction, soil disturbance, and inability to guarantee axial transmission of traction force. Their construction safety, convenience, and reliability need to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a bridge correction and resetting system using the pier top index pullback method, addressing the shortcomings of existing technologies.

[0006] Another objective of this invention is to provide a construction method for the bridge correction and repositioning system described above, which uses the pier top index pullback method.

[0007] A bridge correction and repositioning system using the pier-top index pullback method includes a bridge abutment composite column anchoring device 1, a force-generating device 2 providing the repositioning load, a tension conversion device 3, correction steel strands 4, and a pier-top anchoring device 5, wherein:

[0008] The bridge abutment combined column anchoring device 1 includes a column anchoring device 1-1, a column reinforcing steel block 1-2, a steel crossbeam 1-3 for reinforcing the column, an anchor cable 1-4, and a compression anchor head 1-5. The bridge abutment combined column anchoring device 1 provides strong anchoring force by combining and reinforcing multiple adjacent corrugated guardrail columns at the bridge abutment into a whole. The column anchoring device 1-1 is made of steel and has two symmetrically arranged anchor cable insertion holes 1-6 and compression anchor head force transmission holes 1-7 in the middle. After the anchor cable 1-4 is inserted, it is anchored by the compression anchor head 1-5. After securing, it is inserted into the column anchoring device 1-1, with a semi-circular opening 1-8 on one side, the radius of which is the same as the cross-sectional radius of the column; the column reinforcing steel block 1-2 is made of steel, with a semi-circular opening 1-9 on one side, the radius of which is the same as the cross-sectional radius of the column; the end of the force transmission hole 1-7 of the extrusion anchor head has a threaded cap 1-10; the column anchoring device 1-1 and the column reinforcing steel block 1-2 are bolted to the column 1-11; the steel beam 1-3 of the reinforced column is welded to the column reinforcing steel block 1-2 to form a whole;

[0009] The force-generating device 2 that provides the reset load is a chain hoist, which is connected to the tension conversion device 3 by hooking the universal rotating ring 3-4 with the hooks 2-1 at both ends;

[0010] The tension conversion device 3 is made of steel and includes a steel strand insertion hole 3-1, a compression anchor head force transmission hole 3-2, a lifting ring mounting hole 3-3 with internal threads, and a universal rotating lifting ring 3-4. One end of the universal rotating lifting ring 3-4 is threaded and screwed onto the tension conversion device 3. After the correction steel strand 4 passes through the steel strand insertion hole 3-1, it forms a reliable tension transmission through the compression anchor and the compression anchor head force transmission hole 3-2.

[0011] Furthermore, the columns 1-11 are hollow steel columns. When the required correction force is too large, concrete is filled into the cavity of the columns 1-11.

[0012] Furthermore, the tension conversion device 3 is provided with multiple compression anchor head force transmission holes 3-2, and the number of steel strands can be installed as needed according to the magnitude of the traction force, with one in the center, two symmetrically arranged or three strands.

[0013] Furthermore, the end of the force transmission hole 3-2 of the extrusion anchor head has a threaded cap 3-5.

[0014] Furthermore, the pier top anchoring device 5 consists of a steel pad 5-1, an anchor cable stress gauge 5-2, an anchor pad 5-3, and a compression anchor head 5-4.

[0015] Furthermore, one end of the steel strand of the anchoring device 5 is inserted into the tension conversion device 3 and anchored by the extrusion anchor head. The other end of the steel strand is inserted into the reserved hole in the pier body, and its tail end is sequentially inserted through the perforated steel pad 5-1, the anchor cable stress gauge 5-2, and the anchor pad 5-3 and fixed by the extrusion anchor head 5-4.

[0016] A construction method for a bridge correction and repositioning system using the pier-top index pullback method includes the following steps:

[0017] 1) Install column reinforcement devices, and fill the column cavity with concrete if necessary;

[0018] 2) Anchor cables 1-4 are anchored to bridgehead composite column anchoring device 1 by squeezing anchor heads 1-5;

[0019] 3) Fabrication of tension conversion device 3: Steel is machined and formed;

[0020] 4) Anchor cables 1-4 and straightening steel strands 4 are anchored to the tension conversion device 3 by extrusion anchor heads;

[0021] 5) Fine-tune the length of the correction steel strand using semi-circular shims 3-6 to ensure the axial transmission of the reset load;

[0022] 6) Install chain hoist 2, and connect it to the force conversion device 3 by hooking the universal rotating lifting ring 3-4 with the hooks 2-1 at both ends;

[0023] 7) Install the anchoring device 5 on the top of the pier. After the correction steel strand passes through the reserved hole in the pier body, its tail end is fixed by passing through the perforated steel pad 5-1, the anchor stress gauge 5-2, and the anchor pad 5-3 in sequence with the extrusion anchor head 5-4.

[0024] Compared with the prior art, the present invention has the following significant effects:

[0025] 1) This invention utilizes the corrugated guardrail posts at the bridgehead. After combining and reinforcing multiple adjacent posts, they are used as a load-correcting reaction device. There is no need to drill holes in the soil (rock), so it does not disturb the soil and has a low risk of secondary diseases.

[0026] 2) The tension conversion device of this invention can realize the axial transmission between traction force and anchoring reaction force without causing shear damage to the correction steel strands. The tension conversion device of this invention is provided with multiple extrusion anchor head force transmission holes, and the number of steel strands can be installed as needed according to the magnitude of the traction force, with one central strand, two symmetrical strands, or three strands, which is suitable for bridge correction projects under different conditions.

[0027] 3) The anchor cables and corrective steel strands of this invention are anchored into the anchor holes by extruding anchor heads, ensuring reliable anchoring and construction safety. The force-generating device for the reset load in this invention uses a chain hoist, providing a stable, gentle, and linear traction force. An anchor cable stress gauge is installed on the anchoring device at the pier top to monitor the anchor cable stress in real time during the correction process. This invention features a simple device, convenient operation, and a small construction footprint, making it a practical solution for bridge correction. Attached Figure Description

[0028] Figure 1The diagram shows the bridge correction and resetting system device using the pier top index pullback method in this invention.

[0029] Figure 2 This is a disassembly diagram of the bridgehead combined column anchoring device in this invention;

[0030] Figure 3 This is a disassembly diagram of the force conversion device in this invention;

[0031] Figure 4 This is a schematic diagram of the disassembly of the pier top anchoring device in this invention;

[0032] In the diagram: 1-Bridgehead composite column anchoring device; 2-Force generating device providing reset load; 3-Tension conversion device; 4-Correction steel strand; 5-Pier top anchoring device; 1-1-Column anchoring device; 1-2-Column reinforcing steel block; 1-3-Steel crossbeam for reinforcing the column; 1-4-Anchor cable; 1-5-Extrusion anchor head; 1-6-Anchor cable insertion hole; 1-7-Extrusion anchor head force transmission hole; 1-8-Semicircle 1-9-Semi-circular opening; 1-10-With threaded cap; 1-11-Column; 2-1-Hook; 3-1-Steel strand insertion hole; 3-2-Extrusion anchor head force transmission hole; 3-3-Lifting ring mounting hole; 3-4-Universal rotating lifting ring; 3-5-With threaded cap; 3-6-Semi-circular gasket; 5-1-Steel pad; 5-2-Anchor cable stress gauge; 5-3-Anchor pad plate; 5-4-Extrusion anchor head. Detailed Implementation

[0033] This invention provides a bridge correction and repositioning system using the pier-top index pullback method, comprising a bridgehead composite column anchoring device, a force-generating device providing the repositioning load, a tension conversion device, correction steel strands, and a pier-top anchoring device, wherein:

[0034] Furthermore, the reaction force-providing device provides strong anchoring force by reinforcing multiple adjacent corrugated guardrail posts at the bridgehead into a whole.

[0035] Furthermore, to ensure that the columns can withstand the reaction force of the reset load, the columns are reinforced using a bridgehead combined column anchoring device, column reinforcing steel blocks, steel beams for reinforcing the columns, anchor cables, and extrusion anchor heads.

[0036] Furthermore, to ensure reliable anchoring of the anchor cables, two symmetrical circular holes are set on the bridge abutment composite column anchoring device made of steel blocks. The front hole has a small diameter for threading the anchor cable, while the rear hole has a large diameter to compress and anchor the threaded anchor cable into the circular hole.

[0037] Furthermore, to ensure construction safety and prevent injury from the extrusion of the compression anchor head due to breakage of the steel strand, a threaded cap is installed at the end of the force transmission hole of the compression anchor head.

[0038] Furthermore, in the bridgehead composite column anchoring device, the column reinforcing steel block is installed on the column by bolting; the steel crossbeam of the reinforcing column is installed on the column reinforcing steel block by welding.

[0039] Furthermore, when the required reset load is too large, the corrective reaction force provided by the cavity column is insufficient, so concrete is filled into the cavity for reinforcement.

[0040] Furthermore, to ensure the connection between the power generation device and the straightening steel strand, and between the power generation device and the anchor cable, a tension conversion device is installed.

[0041] Furthermore, the tension conversion device is made of steel, with multiple round holes on one side, and the hole forming method is the same as that of the bridgehead combined column anchoring device, which is used to anchor the correction steel strands and anchor cables. The other side is provided with a lifting ring mounting hole with internal threads for installing a universal rotating lifting ring.

[0042] Furthermore, the tension conversion device is equipped with multiple compression anchor head force transmission holes, and the number of steel strands can be installed as needed according to the magnitude of the traction force, with one in the center, two symmetrical strands, or three strands.

[0043] Furthermore, the force-generating device that provides the reset load uses a chain hoist, which connects to the force conversion device by hooking the universal rotating rings at both ends.

[0044] Furthermore, the pier top anchoring device consists of a steel pad, an anchor cable stress gauge, an anchor plate, and a compression anchor head.

[0045] Furthermore, holes are drilled in the component to be corrected, and the steel strand is threaded through the reserved holes in the pier body. The tail end is then fixed by sequentially threading through a perforated steel pad, an anchor stress gauge, an anchor pad, and an extrusion anchor head.

[0046] A construction method for a bridge correction and repositioning system using the pier-top index pullback method includes the following steps:

[0047] 1) Install column reinforcement devices, and fill the column cavity with concrete if necessary;

[0048] 2) Anchor cables are secured to the bridge abutment composite column anchorage device by squeezing the anchor head;

[0049] 3) Fabrication of the tension conversion device: Steel is machined and shaped;

[0050] 4) Anchor cables and straightening steel strands are anchored to the tension conversion device by extruding anchor heads;

[0051] 5) Fine-tune the length of the correction steel strand by using semi-circular shims to ensure the axial transmission of the reset load;

[0052] 6) Install a chain hoist and connect it to the tension conversion device by hooking the universal rotating rings at both ends;

[0053] 7) Install the anchoring device on the top of the pier. After the correction steel strand passes through the reserved hole in the pier body, its tail end is sequentially passed through the perforated steel pad, anchor stress gauge, anchor plate and extrusion anchor head.

[0054] Example 1

[0055] like Figure 1 The diagram shows the bridge correction and repositioning system device using the pier-top index pullback method of the present invention. The bridgehead combined column anchoring device 1 provides strong anchoring force by reinforcing multiple adjacent corrugated guardrail columns at the bridgehead into a single unit. The other end of the bridgehead combined column anchoring device 1 anchors an anchor cable to the tension conversion device 3. The force-generating device 2, which provides the repositioning load, is a chain hoist, with hooks at both ends connecting to the universal rotating rings on the tension conversion device 3. The correction steel strand 4 is anchored to the tension conversion device 3 by extruding anchor heads. After passing through the pre-drilled holes in the component to be corrected, the correction steel strand is anchored through the pier-top anchoring device 5.

[0056] like Figure 2 As shown, the bridge abutment composite column anchoring device 1 consists of a column anchoring device 1-1, a column reinforcing steel block 1-2, a steel crossbeam 1-3 for reinforcing the column, an anchor cable 1-4, and a compression anchor head 1-5. The column anchoring device 1-1 and the column reinforcing steel block 1-2 are bolted to the column 1-11. The steel crossbeam 1-3 for reinforcing the column is welded to the column reinforcing steel block 1-2 to form a whole. The anchor cable is anchored to the column anchoring device 1-1 through the compression anchor head 1-5.

[0057] like Figure 3 As shown, the tension conversion device 3 is equipped with multiple extrusion anchor head force transmission holes 3-2. The number of steel strands can be installed as needed according to the magnitude of the traction force, with one in the center, two symmetrically arranged, or three strands.

[0058] like Figure 4 As shown, the pier top anchoring device 5 consists of a steel pad 5-1, an anchor cable stress gauge 5-2, an anchor plate 5-3, and a compression anchor head 5-4. The anchor cable stress gauge 5-2 monitors the anchor cable stress during the correction process.

[0059] Example 2

[0060] The main difference from Example 1 is that the required reset load is too large, and the hollow column cannot withstand the reset load. The column cavity is further reinforced by filling it with concrete.

Claims

1. A bridge correction and resetting system using the pier-top index pullback method, characterized in that, This includes the bridge abutment composite column anchorage device, the force-generating device providing the reset load, the tension conversion device, the straightening steel strand, and the pier top anchorage device, among which: The bridge abutment composite column anchoring device includes a column anchoring device, a column reinforcing steel block, a steel beam for reinforcing the column, anchor cables, and extrusion anchor heads. This device provides strong anchoring force by combining and reinforcing multiple adjacent corrugated guardrail columns at the bridge abutment into a single unit. The column anchoring device is made of steel and has two symmetrically arranged anchor cable insertion holes and an extrusion anchor head force transmission hole in the middle. After the anchor cable is inserted, it is anchored by the extrusion anchor head and then locked into the column anchoring device. One side has a semi-circular opening with the same radius as the column's cross-sectional radius. The column reinforcing steel block is also made of steel and has a semi-circular opening with the same radius as the column's cross-sectional radius. The extrusion anchor head force transmission hole has a threaded cap at its end. The column anchoring device consists of the column reinforcing steel block bolted to the column. The steel beam for reinforcing the column is welded to the column reinforcing steel block to form a single unit. The force-generating device that provides the reset load is a chain hoist, which is connected to the force conversion device by hooking the universal rotating rings at both ends; The tension conversion device is made of steel and includes a steel strand insertion hole, a compression anchor head force transmission hole, a lifting ring mounting hole with internal threads, and a universal rotating lifting ring. One end of the universal rotating lifting ring is threaded and screwed onto the tension conversion device. After the correction steel strand passes through the steel strand insertion hole, it forms a reliable tension transmission through the compression anchor and the compression anchor head force transmission hole. The pier top anchoring device consists of a steel pad, an anchor cable stress gauge, an anchor pad, and an extrusion anchor head; One end of the anchoring device at the top of the pier is threaded through a tension conversion device and anchored by a compression anchor head. The other end of the steel strand is threaded through a pre-drilled hole in the pier body, and its tail end is sequentially threaded through a perforated steel pad, an anchor cable stress gauge, and an anchor pad plate and then fixed by a compression anchor head.

2. The bridge correction and resetting system using the pier-top index pullback method according to claim 1, characterized in that, The column is a hollow steel column. When the required correction force is too large, concrete is filled into the cavity of the column.

3. The bridge correction and resetting system using the pier-top index pullback method according to claim 1, characterized in that, The tension conversion device is equipped with multiple compression anchor head force transmission holes. The number of steel strands can be installed as needed according to the magnitude of the traction force, with one in the center, two symmetrical strands, or three strands.

4. The bridge correction and resetting system using the pier top index pullback method according to claim 3, characterized in that, The end of the force transmission hole of the extrusion anchor head has a threaded cap.

5. The construction method of the bridge correction and repositioning system using the pier top index pullback method as described in any one of claims 1 to 4, comprising the following steps: 1) Install the column reinforcement device and fill the column cavity with concrete; 2) Anchor cables are secured to the bridge abutment composite column anchorage device by squeezing the anchor head; 3) Fabrication of the tension conversion device: Steel is machined and shaped; 4) Anchor cables and straightening steel strands are anchored to the tension conversion device by extruding anchor heads; 5) Fine-tune the length of the correction steel strand by using semi-circular shims to ensure the axial transmission of the reset load; 6) Install a chain hoist and connect it to the tension conversion device by hooking the universal rotating rings at both ends; 7) Install the anchoring device on the top of the pier. After the correction steel strand passes through the reserved hole in the pier body, its tail end is fixed by passing through the perforated steel pad, anchor cable stress gauge, and anchor pad in sequence with the extrusion anchor head.

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