Beam body jacking repair method for double-breadth separated arrangement bridge

Abstract

The invention discloses a beam body jacking and repairing method for a double-amplitude separated arrangement bridge, and relates to the field of bridge repairing, which comprises the following steps: adding temporary limit and local support of an inclined pier column, establishing a supporting system on the inclined pier column, jacking for the first time, mounting a middle cross beam, jacking for the second time, dismounting a temporary support, and transferring a beam body supporting point to the middle cross beam. A health detection system is added to the bridge. According to the systematic beam body jacking repairing method for the double-amplitude separated type arrangement bridge, the inclined pier columns are repaired and replaced, the safety of the affected bridge is improved, and meanwhile the construction efficiency is also improved.

Description

Technical Field

[0001] The invention belongs to the field of bridge repair, and in particular relates to a beam jacking repair method for a double-span separated arrangement bridge. Background Art

[0002] Bridges generally refer to structures built on rivers, lakes, and seas to allow vehicles and pedestrians to pass smoothly. Bridges can be divided into single-span bridges and double-span bridges according to their structure. Single-span bridges are single-span bridges that usually allow vehicles to travel in both directions, and are suitable for scenes with low motor vehicle traffic. Double-span bridges are composed of two bridges side by side, and each bridge usually only allows vehicles to travel in one direction, and are suitable for scenes with large multi-lane traffic.

[0003] Pile foundation has high bearing capacity, strong adaptability, mature construction technology and fast construction speed. It is one of the most important foundation forms of bridges in my country. Pile foundation bears all the upper loads of the bridge and is the foundation of the bridge. However, pile foundation is in a natural environment and is inevitably affected by various adverse factors. It often suffers from riverbed scouring, foundation settlement, non-uniform settlement, concrete spalling, steel corrosion, pile necking, broken piles and other diseases. The hazards of pile foundation diseases are mainly manifested in: reducing the bearing capacity, stability and durability of the foundation, resulting in insufficient stability of the bridge piers, causing upper structure diseases and causing bridge collapse. Pile foundation diseases seriously threaten the safety of bridges and must be dealt with in a timely and appropriate manner.

[0004] Due to the impact of geological disasters such as earthquakes and landslides, the piers of bridges sometimes shift, which will greatly affect the passage of vehicles and the safety of bridges. However, there is currently no systematic method for repairing piers. Bridge repairs often require a lot of manpower and material resources, and the repair efficiency is low.

[0005] Therefore, how to propose a systematic beam jacking repair method for a double-span separated bridge that can improve the repair efficiency has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, the present invention provides a method for jacking up and repairing the beam of a double-span separated bridge. The present invention systematically repairs the double-span separated bridge by replacing the bridge piers, which greatly saves the repair time and improves the repair efficiency of the bridge.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A beam jacking repair method for a double-span separated bridge comprises the following construction steps:

[0009] S01. Add temporary limit and local support to the inclined piers to prevent further tilting of the piers and endanger the overall structural safety of the bridge;

[0010] S02. Add pier protection tubes to adjacent piers on both sides of the inclined piers to reinforce the adjacent piers;

[0011] S03. Establish a support system, which is arranged on both sides of the inclined pier. The support system includes vertical columns, longitudinal horizontal braces and transverse tie beams;

[0012] S04. After the steel beams on both sides of the inclined pier are installed and the temporary bearings and pad stones are cast, the first jacking of the entire bridge begins. When the beam body reaches the designed elevation, the entire bridge slowly falls onto the bearing pad at the same time, completing the first jacking work;

[0013] S05. Install the middle cross beam, the support and the pad stone. After the overall lifting height of the beam reaches 5mm according to the lifting process, promptly place the support and leveling steel plate on the middle cross beam at the support position;

[0014] S06. Remove the temporary supports on both sides of the line, transfer the beam support point to the middle beam, and complete the second jacking work;

[0015] S07. Add a health monitoring system to the bridge to monitor the safety status of the bridge in real time.

[0016] Furthermore, the temporary limiting method in S01 is to set a temporary anchor on the opposite side of the inclined side of the pier column to reversely pull the pier body, and use steel pipe supports on the inclined side of the pier body to laterally support the pier body.

[0017] Furthermore, before the support system in S03 is established, it is necessary to set up pile foundations, the pile foundations are cap piles, the rock embedding depth is 5 times the pile diameter, the pile foundation is 28m, and the pile diameter is 1.8m.

[0018] Furthermore, the columns described in S03 adopt steel pipe columns connected to the pedestal pile foundation. The columns are formed by 1.4m diameter steel pipe piers with a wall thickness of 20mm. The inside is filled with C40 slightly expansive concrete. Four columns are arranged horizontally with a column spacing of 5.2m. The longitudinal horizontal braces and transverse tie beams are made of round steel pipes. The longitudinal horizontal braces are made of 600mm diameter steel pipes with a wall thickness of 16mm. The transverse tie beams are made of 800mm diameter steel pipes with a wall thickness of 20mm.

[0019] Furthermore, before the bridge is lifted, the inspection unit needs to set up observation marks on the pier tops of the piers on both sides of the inclined piers and on the bridge deck on the pier tops. Among them, each pier body is equipped with 2-4 monitoring points, and 2 are set on the inner side of the guardrail on the bridge deck of each pier top. Observation points are set on the inner side of the guardrail on both sides near the expansion joint of each joint. During lifting, professional and technical personnel will measure the displacement of the bridge deck in order to accurately reflect the vertical displacement of the beam during lifting and the lateral displacement during pushing, and observe the relative displacement of the beam in real time.

[0020] Furthermore, before the first jacking construction in S04, the position of the jack is determined on the steel beam, and the jack is jacked using a synchronous jacking hydraulic system.

[0021] Furthermore, at the contact point between the jack and the beam body, a steel plate is placed above and below the jack to prevent stress concentration from damaging the beam body.

[0022] Furthermore, two φ1200mm steel pipe columns are set on the outside of the steel pipe pier on the side of the access road to serve as a construction platform for hoisting the upper steel beam to a specified horizontal height.

[0023] Furthermore, the first jacking and the second jacking are both slowly lifted in a micro-amount, step-by-step manner, and the beams are slowly lowered in a micro-amount, step-by-step manner when they are dropped.

[0024] The beneficial effects of the present invention are as follows: the beam jacking repair method of the present invention can effectively repair bridges with inclined piers, avoiding natural disasters such as landslides that endanger the safety of the bridge. The repair scheme of the present invention is reasonably designed, effectively saves construction time, and improves the efficiency of bridge repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Engineering geological cross-section when establishing the support system for the present invention;

[0026] Figure 2 This is the engineering geological cross-section view after the second jacking of the present invention.

[0027] In the figure: 1. Inclined pier column; 2. Anchor; 3. Pier protection tube; 4. Column; 5. Longitudinal horizontal support; 6. Beam. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "horizontal", "inner", "outer", "one side", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a circuit connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 1-2 As shown, a beam jacking repair method for a double-span separated bridge includes the following construction steps:

[0032] S01. Add temporary limit and local support to the inclined pier 1 to prevent the pier from further tilting and endangering the safety of the overall bridge structure. The temporary limit method in this embodiment is to set a temporary anchor 2 on the opposite side of the inclined side of the pier to reverse the pier body, and use steel pipe support on the inclined side of the pier body to support the pier body laterally;

[0033] S02. Add pier protection tubes 3 to adjacent piers on both sides of the inclined pier 1 to reinforce the adjacent piers;

[0034] S03. Establish a support system. The support system is arranged and established on both sides of the inclined pier 1. The support system includes vertical columns 4, longitudinal horizontal braces 5 and transverse tie beams. The column 4 adopts a steel pipe column connected to a pile foundation. The column 4 is formed by a 1.4m diameter steel pipe pier with a wall thickness of 20mm. The inside is filled with C40 micro-expansive concrete. Four columns 4 are arranged horizontally with a column spacing of 5.2m. The longitudinal horizontal braces 5 and transverse tie beams are made of round steel pipes. The longitudinal horizontal braces 5 are made of 600mm diameter steel pipes with a wall thickness of 16mm. The transverse tie beams are made of 800mm diameter steel pipes with a wall thickness of 20mm.

[0035] S04. After the temporary steel beams on both sides of the inclined pier 1 are installed and the temporary supports and pad stones are cast, jacks are used to place pads on the steel beams (to prevent stress concentration from damaging the beam body 6), and the steel beams on both sides of the inclined pier 1 are lifted at the same time. Then, temporary supports are placed on the steel beams, and the height of the pads on the supports is measured. When the pads meet the design height, the jacks are slowly retracted until the entire continuous beam completely falls onto the temporary support pads, completing the first lifting work;

[0036] S05. Build a construction platform at the top of the support system, install the middle beam, the support and the pad stone, and after the overall lifting height of the beam reaches 5mm according to the lifting process, promptly place the support and leveling steel plate on the middle beam at the support position;

[0037] S06. Remove the temporary supports on both sides of the line. After the jack holds the load for 5 minutes, the beam 6 gradually falls onto the supports at a speed of 1 mm / 3 minutes. The support point of the beam 6 is transferred to the middle beam, completing the second jacking work.

[0038] S07. Add a health monitoring system to the bridge to monitor the safety status of the bridge in real time.

[0039] As a preferred embodiment of the present invention, before the bridge is lifted, the inspection unit needs to set up observation marks on the pier tops of the piers on both sides of the inclined pier 1 and on the bridge deck on the pier tops, wherein each pier body is provided with 2-4 monitoring points, and each pier top is provided with 2 on the inner side of the bridge deck guardrail, and each joint is provided with observation points on the inner side of the guardrails on both sides near the expansion joint. During lifting, professional and technical personnel measure the displacement of the bridge deck in order to accurately reflect the vertical displacement of the beam body 6 during lifting and the lateral displacement during pushing, and observe the relative displacement of the beam body 6 in real time.

[0040] As a preferred embodiment of the present invention, two φ1200mm steel pipe columns 4 are arranged outside the steel pipe pier on the side of the access road to serve as a construction platform for hoisting the upper steel beam to a specified horizontal height.

[0041] As a preferred embodiment of the present invention, the first jacking and the second jacking are both slowly lifted in a micro-amount, step-by-step manner, and the beam dropping is slowly lowered in a micro-amount, step-by-step manner.

[0042] As a preferred embodiment of the present invention, before the support system is established, it is necessary to set up a pile foundation, the pile foundation is a cap pile, the rock embedding depth is 5 times the pile diameter, the pile foundation is 28m, and the pile diameter is 1.8m.

[0043] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A beam jacking repair method for a double-span separated bridge, characterized in that: The construction steps include: S01. Add temporary limit and local support to the inclined piers to prevent further tilting of the piers and endanger the overall structural safety of the bridge; S02. Add pier protection tubes to adjacent piers on both sides of the inclined piers to reinforce the adjacent piers; S03. Establish a support system, which is arranged on both sides of the inclined pier. The support system includes vertical columns, longitudinal horizontal braces and transverse tie beams; S04. After the steel beams on both sides of the inclined pier are installed and the temporary bearings and pad stones are cast, the first jacking of the entire bridge begins. When the beam body reaches the designed elevation, the entire bridge slowly falls onto the bearing pad at the same time, completing the first jacking work; S05. Install the middle cross beam, the support and the pad stone. After the overall lifting height of the beam reaches 5mm according to the lifting process, promptly place the support and leveling steel plate on the middle cross beam at the support position; S06. Remove the temporary supports on both sides of the line, transfer the beam support point to the middle beam, and complete the second jacking work; S07. Add a health monitoring system to the bridge to monitor the safety status of the bridge in real time.

2. The beam lifting and repairing method of a double-span separated bridge according to claim 1 is characterized in that: The temporary limiting method in S01 is to set a temporary anchor on the opposite side of the inclined side of the pier column to reverse the pier body, and use steel pipe supports on the inclined side of the pier body to laterally support the pier body.

3. The beam lifting and repairing method of a double-span separated bridge according to claim 1 is characterized in that: Before the support system in S03 is established, pile foundations need to be set up. The pile foundations are cap piles with a rock embedding depth of 5 times the pile diameter, a pile foundation of 28m, and a pile diameter of 1.8m.

4. The beam lifting and repairing method of a double-span separated bridge according to claim 1 is characterized in that: The columns described in S03 adopt steel pipe columns connected to the pedestal pile foundation. The columns are formed by 1.4m diameter steel pipe piers with a wall thickness of 20mm. The inside is filled with C40 slightly expansive concrete. Four columns are set horizontally with a column spacing of 5.2m. The longitudinal horizontal braces and transverse tie beams are made of round steel pipes. The longitudinal horizontal braces are made of 600mm diameter steel pipes with a wall thickness of 16mm. The transverse tie beams are made of 800mm diameter steel pipes with a wall thickness of 20mm.

5. The beam lifting and repairing method of a double-span separated bridge according to claim 1 is characterized in that: Before the bridge is lifted, the inspection unit needs to set up observation marks on the pier tops of the piers on both sides of the inclined piers and on the bridge deck on the pier tops. Among them, each pier body is equipped with 2-4 monitoring points, and 2 are set on the inside of the bridge deck guardrail on each pier top. Observation points are set on the inside of the guardrail on both sides of each joint near the expansion joint. During lifting, professional and technical personnel will measure the displacement of the bridge deck in order to accurately reflect the vertical displacement of the beam during lifting and the lateral displacement during pushing, and observe the relative displacement of the beam in real time.

6. The beam lifting and repairing method of a double-span separated bridge according to claim 1 is characterized in that: Before the first jacking construction in S04, the position of the jack is determined on the steel beam, and the jack is jacked using a synchronous jacking hydraulic system.

7. The beam lifting and repairing method of a double-span separated bridge according to claim 6 is characterized in that: At the contact point between the jack and the beam body, a steel plate is placed above and below the jack to prevent stress concentration from damaging the beam body.

8. The beam jacking repair method for a double-span separated bridge according to claim 1 is characterized in that: Two φ1200mm steel pipe columns are set on the outside of the steel pipe pier on the side of the access road to serve as a construction platform for hoisting the upper steel beam to the specified horizontal height.

9. The beam lifting and repairing method of a double-span separated bridge according to claim 1 is characterized in that: The first jacking and the second jacking are both slowly lifted by a small amount and step by step jacking method, and the beams are slowly lowered by a small amount and step by step dropping method.

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