T-shaped beam bridge pier deviation rectifying device and construction method thereof

Abstract

The invention discloses a T-shaped beam bridge pier deviation rectifying device and a construction method thereof. The T-shaped beam bridge pier deviation rectifying device comprises a two-dimensional pushing device installed on the upper surface of a cover beam, a sensor system fixedly installed on the surface of a pier and a limiting device between expansion joints. Firstly, a T-beam diaphragm plate is reinforced, an expansion joint is welded through a steel plate, and T-beam disengagement and bridge pier deviation rectification are achieved by installing a two-dimensional pushing device on a bent cap. The device has the advantages that the sensors are arranged to monitor the whole process of jacking, pushing, pier column stress strain and pier perpendicularity, bridge body structure damage caused by too large pushing force or non-uniform force application in the construction process is prevented, construction safety is ensured, after pushing work is completed, excavation soil backfilling is conducted after it is monitored that soil stress is completely released, and the construction efficiency is improved. And finally, a limiting device is installed on the bent cap, and it is guaranteed that the pier does not deviate any more.

Description

Technical Field

[0001] The invention relates to the technical field of bridge treatment, in particular to a T-beam bridge pier deviation correction device and a construction method thereof. Background Art

[0002] High piers are a common type of piers for elevated bridges in bridge engineering. Due to the low overall stiffness of high piers, in service projects, under the influence of factors such as automobile braking force, temperature changes, and large longitudinal slopes, the bearings may slide beyond the limit and the piers may deviate. When the piers deviate greatly, tensile cracks may occur at the bottom of the piers, causing the beams and slabs in the opposite direction of the pier deviation to have the risk of slipping and falling. Therefore, the treatment of such pier deviation is a difficult problem with high technical difficulty and safety risks.

[0003] At present, the following are the main correction measures taken in such situations: Remove the load of the superstructure and allow the piers to return to their original state elastically. In this case, load-bearing columns need to be set around the piers to transfer the load of the superstructure to temporary load-bearing columns, so that the piers can return to their original state in a free state.

[0004] Relying on the anchoring measures or jacking supports around the bridge, pull or push the bridge beam to correct the box girder reset and replace the supports.

[0005] Setting up a reaction frame and using the interaction force between the upper beam and the cap beam to push the cap beam back to the pier is a relatively common method. However, the operation procedures of different construction personnel vary greatly during implementation, and no standardized construction process and strict monitoring measures have been formed. Therefore, there is also a great safety risk.

[0006] The above-mentioned method of releasing the upper constraints by setting temporary load-bearing columns is generally difficult to implement due to the above-mentioned terrain restrictions and when the piers are high, and the cost is high; the method of correcting the deviation by traction of the beam body can only use external force to forcibly reset the bridge beam body, which is difficult to effectively correct the deviation of the bridge piers, and it is easy to induce additional internal forces and cause secondary damage. In addition, the traditional method lacks full-cycle monitoring of the deviation correction. After the deviation correction is completed, the piers often undergo secondary deviation under the action of foundation soil stress. For this reason, the present application proposes a T-beam bridge pier correction device and a construction method thereof. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art. By arranging sensors, the whole process monitoring of jacking, pushing, pier column stress and strain, and pier verticality can be achieved to prevent the damage of the bridge structure caused by excessive pushing force or uneven force during construction, thereby ensuring construction safety. After the pushing work is completed, the soil stress is monitored to be completely released before excavation and backfilling, so as to prevent the pier from tilting again under the action of soil stress after the correction is completed. Finally, a limit device is installed on the cap beam to ensure that the pier is no longer deviated. A T-beam bridge pier correction device and a construction method thereof are provided.

[0008] The object of the present invention is achieved through the following technical solutions: A T-beam bridge pier correction device, comprising a pier and a cap beam arranged on the pier, a T beam is arranged on the cap beam, a two-dimensional jacking device is anchored on the cap beam, a strain gauge and a verticality sensor are arranged on the side of the pier, and a transverse diaphragm is arranged below the T beam; In the T-beam bridge pier correction device of the present invention, reinforcing steel is arranged on the T-beam, and the reinforcing steel is used to reinforce the diaphragm, and an expansion joint is arranged on the T-beam, and a welded steel plate is arranged at the expansion joint, and the two-dimensional jacking device includes a horizontal jack, a vertical jack, a steel pad, and a sliding support, and a sliding support is arranged on the top of the cap beam, and the horizontal jack and the sliding support form a whole and are anchored on the cap beam, and the vertical jack is arranged on the sliding support, and the vertical jack is located directly below the diaphragm on the T-beam, and a steel pad is arranged on the top of the vertical jack, and the vertical jack transmits the lifting force to the diaphragm through the steel pad.

[0009] In the T-beam bridge pier correction device of the present invention, a plurality of reinforcing steel sections are provided, and the plurality of reinforcing steel sections are used to reinforce the diaphragm.

[0010] In the T-beam bridge pier deviation correction device of the present invention, the number of the strain gauges is five, and the verticality sensor is arranged above the strain gauge.

[0011] In the deviation correction device for T-beam bridge piers of the present invention, two adjacent T-beams are connected by a plurality of welded steel plates to form a rigid whole, thereby preventing the beam from falling during deviation correction.

[0012] The construction method of the T-beam bridge pier deviation correction device of the present invention comprises the following steps: S1. Transverse diaphragm reinforcement: The end transverse diaphragm that needs to be pushed up is reinforced by reinforcing steel; S2. Installation of the jacking device: Install the two-dimensional jacking device at the designed position; S3. Expansion joint limit: The expansion joint of the bridge is limited by several welded steel plates, and the T beams on both sides of the expansion joint are connected as a whole; S4, T-beam lifting: lift the T-beam by vertical jack to make the T-beam and the support empty; S5. Foundation soil excavation: excavate the soil around the piers and the lower end of the tie beam to release the stress of the piers; S6. Pier jacking and deviation correction: Determine the jacking construction level according to the pier deviation measurement, and correct the pier deviation step by step; S7, stress monitoring and verticality monitoring: strain gauges and verticality sensors are used to monitor the stress changes and verticality changes during the bottom push construction of the bridge piers in real time; S8. Backfilling of foundation soil at the bottom of the pier: After the jacking is completed, the stress on both sides of the pier is monitored for several days. When the strain gauge readings on the left and right sides are balanced and do not change, the excavation at the lower end of the pier and tie beam is backfilled; S9. Install the limit device: After the jacking construction, install a movable limiter between the T-beam and the cap beam to ensure that the support can move normally while keeping the bridge pier from tilting.

[0013] The present invention has the following advantages: 1. The present invention directly utilizes the structure of the bridge body itself to correct deviation. The horizontal sliding support is anchored on the cap beam, and the vertical jack directly lifts the T-beam diaphragm. There is no need to install other auxiliary structures. The force is clear, the operation is simple, and the construction efficiency is high.

[0014] 2. The present invention excavates the soil around the lower end of the pier to the foundation pedestal before the pier deviation correction construction, thereby reducing the obstruction of soil stress during the correction process and reducing the elastic deformation of the pier during the correction process.

[0015] 3. The present invention monitors the entire process of jacking, pushing, pier bottom stress, and pier verticality through sensors installed on the piers, thereby eliminating the risk of excessive pushing and twisting of the piers caused by excessive and uneven pushing force during construction, thereby ensuring the safety of the construction process.

[0016] 4. The present invention backfills the excavated soil after the strains on both sides of the pier are balanced, and unloads the action of the two-dimensional jacking device, which can release the residual stress of the foundation soil below the pedestal and ensure that the pier will not be deflected for the second time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a longitudinal cross-section of the overall structure of the present invention; Figure 2 It is a detailed diagram of the two-dimensional pushing device in the present invention; Figure 3 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 4 It is a partial detailed view of the cross-bridge section of the overall structure of the present invention; Figure 5 It is a schematic diagram of the arrangement of the reinforcement steel of the present invention; Figure 6It is a schematic diagram of the expansion joint welded steel plate of the present invention.

[0018] In the figure, 1. cap beam; 2. pier; 3. T-beam; 4. diaphragm; 5. two-dimensional jacking device; 6. horizontal jack; 7. vertical jack; 8. steel pad; 9. sliding bearing; 10. strain gauge; 11. verticality sensor; 12. bearing; 13. reinforcement steel; 14. tie beam; 15. expansion joint; 16. welded steel plate. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings, and the protection scope of the present invention is not limited to the following: like Figure 1 to Figure 6 As shown, a T-beam bridge pier deviation correction device comprises a pier 2 and a cap beam 1 arranged on the pier 2, a T beam 3 is arranged on the cap beam 1, a two-dimensional jacking device 5 is anchored on the cap beam 1, a strain gauge 10 and a verticality sensor 11 are arranged on the side of the pier 2, and a transverse diaphragm 4 is arranged below the T beam 3; In this embodiment, a reinforcing steel 13 is provided on the T-beam 3, and the reinforcing steel 13 is used to reinforce the diaphragm 4. An expansion joint 15 is provided on the T-beam 3, and a welded steel plate 16 is provided at the expansion joint 15. The two-dimensional jacking device 5 includes a horizontal jack 6, a vertical jack 7, a steel pad 8, and a sliding support 9. A sliding support 9 is provided on the top of the cap beam 1. The horizontal jack 6 and the sliding support 9 form a whole and are anchored on the cap beam 1. The vertical jack 7 is provided on the sliding support 9, and the vertical jack 7 is located directly below the diaphragm 4 on the T-beam 3. A steel pad 8 is provided on the top of the vertical jack 7, and the vertical jack 7 transmits the jacking force to the diaphragm 4 through the steel pad 8. The reinforced diaphragm 4 is directly used as the jacking reaction surface, and its own structure is fully utilized. There is no need to install an additional jacking reaction frame. The construction is simple, and the force is clear and reasonable.

[0020] In this embodiment, a plurality of reinforcing steel sections 13 are provided, and the plurality of reinforcing steel sections 13 are used to reinforce the diaphragm 4 .

[0021] In this embodiment, the number of the strain gauges 10 is five, and the verticality sensor 11 is disposed above the strain gauges 10 .

[0022] In this embodiment, two adjacent T-beams 3 are connected by a plurality of welded steel plates 16 to form a rigid whole to prevent the beams from falling during deviation correction.

[0023] In this embodiment, the construction method of the T-beam bridge pier correction device includes the following construction methods: ①. Reinforcement of diaphragm: The transverse diaphragm 4 that needs to be lifted is reinforced by a plurality of reinforcing steel sections 13 .

[0024] ②. Installation of the push device: The corresponding equipment and materials of the two-dimensional jacking device 5 are transferred to the cap beam 1 by a bridge inspection vehicle or a hanging basket, the sliding support 9 is anchored on the cap beam 1, and the horizontal jack 6, the vertical jack 7, and the steel pad 8 are installed in sequence. The soil at the bottom of the pier is excavated during the jacking process, which can realize the stress correction of the bottom of the pier, and is suitable for correcting the inelastic deviation of the pier, avoiding the problem of the pier deflecting again after conventional deviation correction; ③. Installation of detection system: A. Install strain gauges 10 at the bottom of pier 2 in sequence; B. Install a verticality sensor 11 on the upper part of the strain gauge of pier 2; ④. Expansion joint limit: The main expansion joint 15 of the bridge is welded with steel plates 16 along the width direction, so as to fix the main beams at both ends of the deviation-correcting pier so that the main beams do not move when the pier 2 is pushed up; ④. T-beam lifting: A. Connect the hydraulic system, check the weight of the upper structure of the device, select the tonnage and quantity of the two-dimensional jacks according to a safety factor of more than 1.5 times, and make preparations for jacking; B. Turn on the hydraulic device and lift all vertical jacks 7 at the same time until the T beam 3 is 15-20mm away from the support; C. After the lifting height is in place, lock the vertical jack 7, and observe the lifting conditions of all hydraulic two-dimensional jacks. If there is no abnormality, proceed to the next step or make fine adjustments; ⑤. Excavation of foundation soil: Excavate the soil around the lower end of the pier to the top of the pile foundation, relieve the stress of the soil around the pier, reduce the obstruction of soil stress during the correction process, and reduce the elastic deformation of the pier during the correction process; ⑥. Pier correction and jacking: According to the measurement of the pier deviation, the jacking displacement is divided into several stages. The displacement of each stage is 2-4cm. The initial stage can be set to 4cm, and the last three stages can be set to 2cm. After each jacking, stop observation for at least 2h; ⑦. Stress monitoring and verticality monitoring: A strain gauge 10 is set on the compression side of the bottom pier 2 during the jacking construction. Each pier 2 is set in this way to detect the stress change during the jacking process. When the stress change exceeds the limit or the change amplitude is too large, the jacking is stopped immediately to find out the cause and then continue the construction. This step is to supplement the conditions for the completion of the deviation correction, such as the verticality reaching a certain value to complete the deviation correction; The verticality sensor 11 is used to repeatedly measure the verticality of the bridge pier 2 up and down during the jacking process, which is used as a basis for whether to continue jacking; if reverse bending occurs at the variable cross-section during the jacking process, the jacking should be stopped immediately and the cause should be identified and measures taken before continuing; ⑧. Backfilling of excavated soil at the bottom of the pier: After the deviation correction is completed, the force of the jack is not immediately unloaded, and the T beam 3 and the support 12 are kept in an empty state. The stress and strain on both sides of the pier are detected throughout the whole cycle. When the strain on both sides is balanced and no longer changes, the excavated soil is backfilled to unload the action of the two-dimensional jacking device 5; ⑨. Install the limit device: replace or repair the original support 12, slowly release the pressure of the two-dimensional jacking device 5, and let the T beam fall on the repaired support 12. Install the movable limiter to ensure that the support 12 can move normally while keeping the pier 2 from tilting. Use rubber plates to make elastic contact between the movable limiter and the main beam; Before the pier correction construction, the soil around the lower end of the pier is excavated to the foundation pedestal to reduce the obstruction of soil stress during the correction process and reduce the elastic deformation of the pier during the correction process.

[0025] The sensors installed on the piers monitor the entire process of jacking, pushing, pier bottom stress, and pier verticality to eliminate the risk of excessive pushing and twisting of the piers due to excessive and uneven pushing force during construction, thereby ensuring the safety of the construction process.

[0026] After the strains on both sides of the pier are balanced, the excavated soil is backfilled and the action of the two-dimensional jacking device is unloaded, which can release the residual stress of the foundation soil below the pedestal and ensure that the pier will not deviate again.

[0027] It should be noted that when in use, the bridge body's own structure is directly used to correct the deviation, the horizontal sliding support is anchored on the cap beam, and the vertical jack directly lifts the T-beam cross diaphragm. There is no need to install other auxiliary structures. The force is clear, the operation is simple, and the construction efficiency is high. The parts not involved in the device are the same as the existing technology or can be implemented by existing technology.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A T-beam bridge pier deviation correction device, characterized in that: It comprises a bridge pier and a cap beam arranged on the bridge pier, the cap beam is provided with a T beam, a two-dimensional jacking device is anchored on the cap beam, a strain gauge and a verticality sensor are arranged on the side of the bridge pier, and a transverse diaphragm is arranged below the T beam; Reinforcement steel is arranged on the T-beam, and the reinforcement steel is used to reinforce the diaphragm. Expansion joint is arranged on the T-beam, and welded steel plate is arranged at the expansion joint. The two-dimensional jacking device includes horizontal jack, vertical jack, steel pad and sliding support. The top of the cap beam is provided with sliding support. The horizontal jack and the sliding support form a whole and are anchored on the cap beam. The vertical jack is arranged on the sliding support, and the vertical jack is located directly below the diaphragm on the T-beam. A steel pad is arranged on the top of the vertical jack, and the vertical jack transmits the lifting force to the diaphragm through the steel pad.

2. A T-beam bridge pier deviation correction device according to claim 1, characterized in that: There are a plurality of reinforcing steel sections, and the plurality of reinforcing steel sections are used to reinforce the transverse partition.

3. The T-beam bridge pier deviation correction device according to claim 1 is characterized by: The number of the strain gauges is five, and the verticality sensor is arranged above the strain gauges.

4. The T-beam bridge pier deviation correction device according to claim 1 is characterized in that: Two adjacent T-beams are connected by a plurality of welded steel plates to form a rigid whole to prevent the beams from falling during deviation correction.

5. The construction method of a T-beam bridge pier deviation correction device according to claim 1 is characterized by: The following steps are involved: S1. Transverse diaphragm reinforcement: The end transverse diaphragm that needs to be pushed up is reinforced by reinforcing steel; S2. Installation of the jacking device: Install the two-dimensional jacking device at the designed position; S3. Expansion joint limit: The expansion joint of the bridge is limited by several welded steel plates, and the T beams on both sides of the expansion joint are connected as a whole; S4, T-beam lifting: lift the T-beam by vertical jack to make the T-beam and the support empty; S5. Foundation soil excavation: excavate the soil around the piers and the lower ends of the tie beams to release the stress of the piers; S6. Pier jacking correction: Determine the jacking construction level according to the pier deviation measurement, and correct the pier deviation step by step; S7. Stress monitoring and verticality monitoring: Use strain gauges and verticality sensors to monitor the stress changes and verticality changes during the bottom push construction of the bridge pier in real time; S8. Backfilling of foundation soil at the bottom of the pier: After the jacking is completed, the stress on both sides of the pier is monitored for several days. When the strain gauge readings on the left and right sides are balanced and do not change, the excavation at the lower end of the pier and tie beam is backfilled; S9. Install the limit device: After the jacking construction, install a movable limiter between the T-beam and the cap beam to ensure that the support can move normally while keeping the bridge pier from tilting.

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