Deck type arch bridge temporary reinforcing structure and construction method thereof

Abstract

The invention relates to a deck type arch bridge temporary reinforcing structure and a construction method thereof.The deck type arch bridge temporary reinforcing structure comprises a steel arch frame structure, hinged supports and a main support, the steel arch frame structure is arranged below an existing arch ring of the deck type arch bridge, the two ends of the steel arch frame structure are fixedly arranged on the hinged supports to form two hinged arches, and the main support is arranged on the hinged supports; the hinged support is movably arranged in the main support; the main support is fixedly arranged on the retaining wall and located on the inner side of an existing bridge abutment. The reinforcing construction period is short, the temporary reinforcing structure is convenient to disassemble, and the temporary passing requirement of large equipment transport vehicles is met.

Description

Technical Field

[0001] The present invention relates to the field of temporary reinforcement of bridges, and more particularly to a temporary reinforcement structure of a deck arch bridge and a construction method thereof. Background Art

[0002] With the rapid development and implementation of industries like equipment manufacturing, energy, petrochemicals, and metallurgy, the scale of key construction projects has expanded rapidly, necessitating an increasing burden on the transportation of critical equipment, including large-scale transport. Examples include nuclear power (hydropower, thermal power) units, wind turbines, transformers, large steel furnaces, and oil storage tanks. The transportation of critical equipment is directly linked to the construction progress of key projects. Delays not only significantly increase the cost of large-scale transport, but also make subsequent construction unsustainable, increasing overall project operating costs and inevitably impacting the smooth implementation of key projects.

[0003] The load of vehicles transporting large equipment often far exceeds the design live load of the bridge, which is a great challenge to the safety of highway bridges. Large equipment needs to be transported from the manufacturer to the project installation site. Sometimes, due to limited conditions, some non-large equipment transportation channels must be used. The load standards of the upper arch bridges built in the early days were low. The axle weight of vehicles transporting large equipment exceeds the load standards of the operating bridge by 50% to 100%. In order to ensure the operational safety of large equipment and bridges, such bridges need to be renovated by demolition and reconstruction or reinforcement and upgrading to meet the traffic requirements of large equipment transportation vehicles. Bridge demolition and reconstruction: (1) The bridge design needs to be based on the load of large equipment and the load of transportation vehicles as live loads, which is complex; (2) The bridge needs to be rebuilt after demolition, which takes a long construction period and cannot meet the time requirements for large equipment transportation; (3) Bridge demolition and reconstruction greatly increases the cost of large equipment transportation, resulting in a waste of funds. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a temporary reinforcement structure for a top-supported arch bridge and a construction method thereof, which significantly improves the bearing capacity of the existing bridge, shortens the reinforcement construction period, and makes the temporary reinforcement structure easy to disassemble, thereby meeting the temporary passage requirements of large equipment transport vehicles.

[0005] The technical solution adopted by the present invention to solve its technical problems is: constructing a temporary reinforcement structure of an overhead arch bridge, including a steel arch frame structure, a hinged support and a main support, the steel arch frame structure is arranged under the existing arch ring of the overhead arch bridge, the two ends of the steel arch frame structure are fixedly arranged on the hinged support to form two hinged arches, and the hinged support is movably arranged in the main support; the main support is fixedly arranged on the retaining wall and is located on the inner side of the existing abutment.

[0006] According to the above solution, the steel arch structure includes longitudinal steel arch pieces and transverse connections, wherein the longitudinal steel arch pieces include multiple pieces and are all arranged longitudinally, and the transverse connections are transversely fixedly arranged between the longitudinal steel arch pieces to form an overall rigid structure;

[0007] The longitudinal steel arch frame piece includes an upper and lower layer, the longitudinal steel arch frame piece located on the upper layer is an upper chord, and the longitudinal steel arch frame piece located on the lower layer is a lower chord, and a straight web member, a long diagonal web member, and a short diagonal web member are fixedly arranged between the upper chord and the lower chord; the straight web member is vertically fixedly arranged between the upper chord and the lower chord, the long diagonal web member is obliquely fixedly arranged between the upper chord and the lower chord, and the short diagonal web member is obliquely fixedly arranged between the upper chord and the long diagonal web member;

[0008] The transverse connection is fixedly provided between adjacent upper chords, and the connection between the transverse connection and the upper chord and the connection between the straight web and the upper chord are the same; the transverse connection is fixedly provided between adjacent lower chords, and the connection between the transverse connection and the lower chord and the connection between the straight web and the lower chord are the same.

[0009] According to the above scheme, the hinge support includes a hinge head and a hinge shaft. The hinge shaft is movably arranged in the hinge head to form a hinge structure that can only rotate vertically. The hinge heads arranged at the lower end of the hinge shaft include multiple hinge heads, and adjacent hinge heads are spaced 25cm to 30cm apart. Reinforcing steel plates are fixed between adjacent hinge heads.

[0010] The hinge joint includes an arc-shaped steel plate and a supporting steel frame. The upper part of the supporting steel frame is an arc-shaped structure with the left side higher and the right side lower. The lower part of the supporting steel frame is a rectangle. The curvature of the arc-shaped steel plate is consistent with the curvature of the upper part of the supporting steel frame. The arc-shaped steel plate and the supporting steel frame are fixedly connected. A side base steel plate is fixedly provided on the left side of the supporting steel frame, and a lower base steel plate is fixedly provided on the bottom of the supporting steel frame.

[0011] According to the above solution, the left and right ends of the stiffening steel plate are fixedly arranged at the arc of the adjacent arc-shaped steel plate.

[0012] According to the above solution, the arc angle of the arc-shaped steel plate is 155°; the hinge shaft comprises a hinge shaft steel pipe, and the hinge shaft steel pipe is poured with concrete to prevent the hinge shaft from deforming.

[0013] According to the above solution, the main support includes vertical support and horizontal support;

[0014] The upper end of the vertical support is fixedly connected to the lower base steel plate, and the lower end of the vertical support is fixedly connected to the vertical support steel plate on the retaining wall, and the vertical support steel plate is pre-buried in the retaining wall;

[0015] The inner side of the transverse support is fixedly connected to the side base steel plate, and the outer side of the transverse support is fixedly connected to the transverse support steel plate on the existing abutment. The transverse support steel plate is fixedly arranged on the surface of the existing abutment.

[0016] According to the above scheme, the hinge supports are made of Q355 steel, the supports are made of Q355 steel; the concrete poured into the hinge shaft is C40 concrete, and the retaining wall is made of C40 reinforced concrete structure.

[0017] According to the above solution, mortar is poured between the steel arch structure and the existing arch ring of the deck arch bridge.

[0018] The present invention also provides a construction method for a temporary reinforcement structure of a deck arch bridge, comprising the following steps:

[0019] S1. Divide the longitudinal steel arch frame into several segments according to the lifting and transportation conditions. The segmentation of the longitudinal steel arch frame is completed in the factory or at the construction site.

[0020] S2. Excavate a foundation pit in front of the existing abutment. The bearing capacity of the foundation should be no less than 400KPa. If the bearing capacity does not meet the requirements, reinforcement treatment should be carried out. A retaining wall should be cast in situ at the foundation pit. Vertical support steel plates should be embedded during the construction of the retaining wall.

[0021] S3. Install transverse support steel plates on the existing abutments, and fix the existing abutments and transverse support steel plates with bolts;

[0022] S4. Install vertical supports on the retaining wall and install transverse supports on the existing abutments. The lower ends of the vertical supports are welded to the vertical support steel plates, and the outer ends of the transverse supports are welded to the transverse support steel plates.

[0023] S5. Install the hinged support on the main support, weld the lower base steel plate to the upper end of the vertical support, weld the side base steel plate to the outer side of the transverse support, weld the support steel frame to the lower base steel plate and the side base steel plate, weld the curved steel plate to the upper curved surface of the support steel frame, weld the stiffening steel plate to the curved side surface of the support steel frame, install the hinged axis steel pipe within the arc of the curved steel plate, and pour concrete inside the hinged axis steel pipe;

[0024] S6. Install the steel arch structure by hoisting the longitudinal steel arch segments into place. The longitudinal steel arch segments are connected by welding to form longitudinal steel arch segments. Adjacent longitudinal steel arch segments are connected by transverse connections. The transverse connections are welded to corresponding positions of the straight web members on the longitudinal steel arch segments to form the steel arch structure.

[0025] S7. Pour mortar between the steel arch structure and the existing arch ring of the deck arch bridge, and transfer the load to the steel arch structure through the arch ring.

[0026] 10. The construction method of a temporary reinforcement structure for a deck arch bridge according to claim 9, wherein the number of the transverse supports and the number of the vertical supports are no less than two.

[0027] The temporary reinforcement structure for a deck arch bridge and the construction method thereof according to the present invention have the following beneficial effects:

[0028] The temporary reinforcement structure of the top-supported arch bridge adopted in the present invention is connected to the existing arch bridge by grouting and will not cause damage to the existing arch bridge; the steel arch frame can bear the force independently, and the existing arch bridge is disturbed little during construction, there is no need to interrupt traffic, and the construction period is short; when dismantling, the original bearing capacity of the existing bridge will not be reduced, which saves transportation costs and ensures the installation period of large parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 It is a structural schematic diagram of the temporary reinforcement structure of the deck arch bridge of the present invention;

[0031] Figure 2 is a top view of the temporary reinforcement structure of the deck arch bridge of the present invention;

[0032] Figure 3 It is a schematic diagram of the steel arch structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the connection structure between the hinge head and the hinge shaft of the present invention;

[0034] Figure 5 Schematic diagram of the split structure of the hinge joint of the present invention;

[0035] Figure 6 is a top view of adjacent hinged joints of the present invention;

[0036] Figure 7 It is the front view of the adjacent hinge joint of the present invention

[0037] Figure 8 It is a structural schematic diagram of the hinge shaft of the present invention;

[0038] Figure 9 This is a schematic diagram of the connection structure between the existing platform bridge and the transverse support of the present invention;

[0039] Figure 10 Schematic diagram of the connection structure between the retaining wall and the vertical support of the present invention;

[0040] In the figure: 1. Steel arch structure, 2. Hinge support, 3. Main support, 4. Retaining wall, 5. Existing abutment, 6. Longitudinal steel arch plate, 7. Hinge joint, 8. Hinge axis, 101. Upper chord, 102. Lower chord, 103. Straight web, 104. Long diagonal web, 105. Short diagonal web, 106. Transverse connection, 801. Hinge axis steel pipe, 9. Lower base steel plate, 10. Side base steel plate, 11. Vertical support, 12. Transverse support, 13. Vertical support steel plate, 14. Transverse support steel plate, 15. Arc steel plate, 16. Support steel frame, 18. Stiffening steel plate. DETAILED DESCRIPTION

[0041] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0042] like Figure 1-8 As shown, the temporary reinforcement structure of the top-supported arch bridge of the present invention includes a steel arch frame structure 1, a hinge support 2 and a main support 3. The steel arch frame structure 1 is arranged under the existing arch ring of the top-supported arch bridge. In order not to damage the arch ring, mortar is poured between the steel arch frame structure 1 and the existing arch ring of the top-supported arch bridge. The two ends of the steel arch frame structure 1 are fixedly arranged on the hinge support 2 to form two hinge arches, and the hinge support 2 is movably arranged in the main support 3; the main support 3 is fixedly arranged on the retaining wall 4 and is located on the inner side of the existing abutment 5, and the retaining wall 4 is arranged on the foundation. The hinge support 2 is used to support the steel arch frame structure 1, so that the steel arch frame structure 1 forms a two-hinged arch structure with a simple structure, high rigidity, low foundation requirements, short construction period, and is more conducive to temporary reinforcement construction. The main support 3 is made of Q355 steel.

[0043] The steel arch frame structure 1 includes a longitudinal steel arch frame piece 6 and a transverse connection 106. The longitudinal steel arch frame piece 6 includes multiple pieces and is longitudinally arranged. The transverse connection 106 is transversely fixed between adjacent longitudinal steel arch frame pieces 6 to form an overall rigid structure to strengthen its overall rigidity. The longitudinal steel arch frame piece 6 includes two layers, the longitudinal steel arch frame piece located on the upper layer is the upper chord 101, and the longitudinal steel arch frame piece located on the lower layer is the lower chord 102. A straight web member 103, a long diagonal web member 104 and a short diagonal web member 105 are fixedly arranged between the upper chord 101 and the lower chord 102. The straight web member 103 is vertically fixed and arranged on the upper chord 101. Between the upper chord 101 and the lower chord 102, the long diagonal web member 104 is fixedly arranged at an angle between the upper chord 101 and the lower chord 102, and the short diagonal web member 105 is fixedly arranged at an angle between the upper chord 101 and the long diagonal web member 104; a transverse connection 106 is fixedly provided between adjacent upper chords 101, and the connection between the transverse connection 106 and the upper chord 101 is the same as the connection between the straight web member 103 and the upper chord 101; a transverse connection 106 is fixedly provided between adjacent lower chords 102, and the connection between the transverse connection 106 and the lower chord 102 is the same as the connection between the straight web member 103 and the lower chord 102.

[0044] The hinge support 2 includes a hinge joint 7 and a hinge shaft 8. The hinge shaft 8 is disposed within the hinge joint 7, forming a hinge structure that can only rotate vertically. There are multiple hinge joints 7 located at the lower end of the hinge shaft 8, with adjacent hinge joints 7 spaced 25 to 30 cm apart. Stiffening steel plates 8 are fixedly installed between adjacent hinge joints 7. The hinge joint 7 includes an arc-shaped steel plate 15 and a support steel frame 16. The upper portion of the support steel frame 16 is an arc-shaped structure with the left side higher and the right side lower. The lower portion of the support steel frame 16 is rectangular. The curvature of the arc-shaped steel plate 15 matches the curvature of the upper portion of the support steel frame 16. The arc-shaped steel plate 15 and the support steel frame 16 are fixedly connected. A side base steel plate 10 is fixedly installed on the left side of the support steel frame 16, and a lower base steel plate 9 is fixedly installed on the bottom of the support steel frame 16. The left and right ends of the stiffening steel plates 18 are fixedly installed on the sides of the arcs of adjacent support steel frames 16. The arc of the curved steel plate 15 is 155 degrees. The hinge shaft 8 includes a hinge shaft steel pipe 801. The hinge shaft steel pipe 801 is filled with concrete to prevent deformation of the hinge shaft 8. The concrete poured into the hinge shaft 8 is C40 concrete. The steel in the hinge support 2 is all Q355 steel.

[0045] The main support 3 consists of vertical supports 11 and transverse supports 12. The upper end of the vertical support 11 is fixedly connected to the lower base steel plate 9, and the lower end of the vertical support 11 is fixedly connected to the vertical support steel plate 13 on the retaining wall 4, which is pre-buried within the retaining wall 4. The inner side of the transverse support 12 is fixedly connected to the side base steel plate 10, and the outer side of the transverse support 12 is fixedly connected to the transverse support steel plate 14 on the existing abutment 5. The transverse support 12 and the vertical support 11 are fixed to the surface of the existing abutment 5. There are no fewer than two transverse supports 12 and two vertical supports 11. The retaining wall 4 is constructed of C40 reinforced concrete.

[0046] The present invention also provides a construction method for a temporary reinforcement structure of a deck arch bridge, comprising the following steps:

[0047] S1. Divide the longitudinal steel arch frame into several segments according to the lifting and transportation conditions. The segmentation of the longitudinal steel arch frame is completed in the factory or at the construction site.

[0048] S2. Excavate a foundation pit in front of the existing abutment 5. The bearing capacity of the foundation should be no less than 400KPa. If the bearing capacity does not meet the requirements, reinforcement treatment should be carried out. A retaining wall 4 should be cast in situ at the foundation pit. When constructing the retaining wall 4, vertical support steel plates 13 should be embedded at the same time.

[0049] S3. Install the transverse support steel plate 14 on the existing abutment 5. The existing abutment 5 and the transverse support steel plate 14 are fixed with bolts;

[0050] S4. Install vertical supports 11 on the retaining wall 4 and install transverse supports 12 on the existing abutment 5. The lower ends of the vertical supports 11 are welded to the vertical support steel plates 11, and the outer sides of the transverse supports 12 are welded to the transverse support steel plates 14.

[0051] S5. Install hinge support 2 on main support 3. Weld lower base steel plate 9 to the upper end of vertical support 11. Weld side base steel plate 10 to the outer side of transverse support 12. Weld support steel frame 13 to lower base steel plate 9 and side base steel plate 10. Weld curved steel plate 15 to the curved surface of support steel frame 16. Weld stiffening steel plate 18 to the curved side surface of support steel frame 16. Install hinge shaft steel pipe 801 within the arc of curved steel plate 15. Pour concrete into hinge shaft steel pipe 801.

[0052] S6. Install the steel arch structure 1 by hoisting the longitudinal steel arch pieces 6 segments into place. The longitudinal steel arch pieces 6 segments are connected by welding to form the longitudinal steel arch pieces 6. Adjacent longitudinal steel arch pieces 6 are connected by transverse connections 106. The transverse connections 106 are welded to the corresponding positions of the straight web members 103 on the longitudinal steel arch pieces 6 to form the steel arch structure 1.

[0053] S7. Pour mortar between the steel arch structure 1 and the existing arch ring of the deck arch bridge, and transfer the load to the steel arch structure 1 through the arch ring.

[0054] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A temporary reinforcement structure for a deck arch bridge, comprising a steel arch frame structure, a hinged support and a main support, characterized in that: The steel arch frame structure is arranged under the existing arch ring of the top-supported arch bridge, and the two ends of the steel arch frame structure are fixedly arranged on hinged supports to form two hinged arches, and the hinged supports are movably arranged in the main support; the main support is fixedly arranged on the retaining wall and located on the inner side of the existing abutment.

2. The temporary reinforcement structure of a deck arch bridge according to claim 1, characterized in that: The steel arch structure includes longitudinal steel arch pieces and transverse connections, wherein the longitudinal steel arch pieces include a plurality of longitudinally arranged steel arch pieces, and the transverse connections are transversely fixedly arranged between the longitudinal steel arch pieces to form an integral rigid structure; The longitudinal steel arch frame piece includes an upper and lower layer, the longitudinal steel arch frame piece located on the upper layer is an upper chord, and the longitudinal steel arch frame piece located on the lower layer is a lower chord, and a straight web member, a long diagonal web member, and a short diagonal web member are fixedly arranged between the upper chord and the lower chord; the straight web member is vertically fixedly arranged between the upper chord and the lower chord, the long diagonal web member is obliquely fixedly arranged between the upper chord and the lower chord, and the short diagonal web member is obliquely fixedly arranged between the upper chord and the long diagonal web member; The transverse connection is fixedly provided between adjacent upper chords, and the connection between the transverse connection and the upper chord and the connection between the straight web and the upper chord are the same; the transverse connection is fixedly provided between adjacent lower chords, and the connection between the transverse connection and the lower chord and the connection between the straight web and the lower chord are the same.

3. The temporary reinforcement structure of a deck arch bridge according to claim 1, characterized in that: The hinge support includes a hinge head and a hinge shaft, wherein the hinge shaft is movably arranged in the hinge head to form a hinge structure that can only rotate vertically. The hinge heads arranged at the lower end of the hinge shaft include a plurality of hinge heads, and adjacent hinge heads are spaced 25 cm to 30 cm apart. Reinforcing steel plates are fixedly arranged between adjacent hinge heads. The hinge joint includes an arc-shaped steel plate and a supporting steel frame. The upper part of the supporting steel frame is an arc-shaped structure with the left side higher and the right side lower. The lower part of the supporting steel frame is a rectangle. The curvature of the arc-shaped steel plate is consistent with the curvature of the upper part of the supporting steel frame. The arc-shaped steel plate and the supporting steel frame are fixedly connected. A side base steel plate is fixedly provided on the left side of the supporting steel frame, and a lower base steel plate is fixedly provided on the bottom of the supporting steel frame.

4. The temporary reinforcement structure of a deck arch bridge according to claim 3, characterized in that: The left and right ends of the stiffening steel plate are fixedly arranged at the arcs of the adjacent arc-shaped steel plates.

5. The temporary reinforcement structure of a deck arch bridge according to claim 3, characterized in that: The arc angle of the arc-shaped steel plate is 155°; the hinge shaft comprises a hinge shaft steel pipe, and the hinge shaft steel pipe is poured with concrete to prevent the hinge shaft from deforming.

6. The temporary reinforcement structure of a deck arch bridge according to claim 3, characterized in that: The main support includes vertical support and horizontal support; The upper end of the vertical support is fixedly connected to the lower base steel plate, and the lower end of the vertical support is fixedly connected to the vertical support steel plate on the retaining wall, and the vertical support steel plate is pre-buried in the retaining wall; The inner side of the transverse support is fixedly connected to the side base steel plate, and the outer side of the transverse support is fixedly connected to the transverse support steel plate on the existing abutment. The transverse support steel plate is fixedly arranged on the surface of the existing abutment.

7. The temporary reinforcement structure of a deck arch bridge according to claim 1, characterized in that: The hinge supports are made of Q355 steel, and the supports are made of Q355 steel; the concrete poured into the hinge shaft is C40 concrete, and the retaining wall is made of C40 reinforced concrete structure.

8. The temporary reinforcement structure of a deck arch bridge according to claim 1, characterized in that: Mortar is poured between the steel arch frame structure and the existing arch ring of the deck arch bridge.

9. A construction method for a temporary reinforcement structure of a deck arch bridge, characterized in that: The following steps are involved: S1. Divide the longitudinal steel arch frame into several segments according to the lifting and transportation conditions. The segmentation of the longitudinal steel arch frame is completed in the factory or at the construction site. S2. Excavate a foundation pit in front of the existing abutment. The bearing capacity of the foundation should be no less than 400KPa. If the bearing capacity does not meet the requirements, reinforcement treatment should be carried out. A retaining wall should be cast in situ at the foundation pit. Vertical support steel plates should be embedded during the construction of the retaining wall. S3. Install transverse support steel plates on the existing abutments, and fix the existing abutments and transverse support steel plates with bolts; S4. Install vertical supports on the retaining wall and install transverse supports on the existing abutments. The lower ends of the vertical supports are welded to the vertical support steel plates, and the outer ends of the transverse supports are welded to the transverse support steel plates. S5. Install the hinged support on the main support, weld the lower base steel plate to the upper end of the vertical support, weld the side base steel plate to the outer side of the transverse support, weld the support steel frame to the lower base steel plate and the side base steel plate, weld the curved steel plate to the upper curved surface of the support steel frame, weld the stiffening steel plate to the curved side surface of the support steel frame, install the hinged axis steel pipe within the arc of the curved steel plate, and pour concrete inside the hinged axis steel pipe; S6. Install the steel arch structure by hoisting the longitudinal steel arch segments into place. The longitudinal steel arch segments are connected by welding to form longitudinal steel arch segments. Adjacent longitudinal steel arch segments are connected by transverse connections. The transverse connections are welded to corresponding positions of the straight web members on the longitudinal steel arch segments to form the steel arch structure. S7. Pour mortar between the steel arch structure and the existing arch ring of the deck arch bridge, and transfer the load to the steel arch structure through the arch ring.

10. The construction method of the temporary reinforcement structure of a deck arch bridge according to claim 9, characterized in that: There are no less than two horizontal supports and two vertical supports.

Images