CN110777682A - Anti-seismic reinforcing method for bridge transverse stop block - Google Patents
Anti-seismic reinforcing method for bridge transverse stop block Download PDFInfo
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- CN110777682A CN110777682A CN201911240808.6A CN201911240808A CN110777682A CN 110777682 A CN110777682 A CN 110777682A CN 201911240808 A CN201911240808 A CN 201911240808A CN 110777682 A CN110777682 A CN 110777682A
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Abstract
The invention discloses an anti-seismic reinforcing method for a bridge transverse stop block, which is suitable for rapid anti-seismic reinforcing and repairing after the bridge transverse stop block is damaged by an earthquake. The technical scheme is characterized by comprising the following steps: s1, resetting the transverse displaced girder and replacing the bridge bearing; s2, cutting the damaged transverse stop block on the existing cover beam, and performing cover processing on the cut surface; s3, designing and manufacturing a new anti-seismic stop block assembly, and hoisting the assembly to two ends of the existing cover beam for positioning; s4, splicing the new anti-seismic stop block and the existing cover beam by tensioning external prestressed reinforcements; and S5, performing corrosion and rust prevention treatment on the in-vitro prestressed steel bars, the anchoring system and the like. By the aid of the method for seismic reinforcement of the stop blocks, the stop blocks can be quickly repaired after earthquake under the condition that existing bent caps are not damaged, and the method is suitable for seismic reinforcement of various stop blocks of small and medium-span bridges in China; the method has the advantages of simple construction process, short field operation time and good anti-seismic reinforcing effect.
Description
Technical Field
The invention belongs to the technical field of bridge seismic resistance, and particularly relates to a seismic strengthening method for a bridge transverse stop block.
Background
At present, with the rapid development of national economy of China, the traffic construction strength is continuously increased, and a large number of highway and railway bridges are constructed, wherein the proportion of the reinforced concrete beam bridges with medium and small spans is the largest.
In China, most of small and medium-span reinforced concrete beam bridges adopt directly-placed plate-type rubber supports, namely, no anchoring measures are taken on the supports, and the upper surfaces of the supports, the beam bottoms and the capping beams, so that the main beams can generate large transverse horizontal displacement under the action of strong earthquake or the impact of ultrahigh vehicles, and the transverse displacement of the overlarge main beams is limited by arranging bridge transverse stop blocks, thereby reducing the risk of beam falling damage. According to statistics, a large number of transverse check blocks are damaged in Wenchuan earthquake in 2008, the check block damage rate of the beam bridge is as high as 16.8%, and a corresponding bridge transverse check block design method is lacked in the current domestic specification, so that the randomness of bridge transverse check block design is large. If the transverse restraint of the transverse stop block on the main beam is too weak, the main beam can be subjected to overlarge displacement to cause beam falling damage; if the transverse restraint of the stop blocks on the main beam is too strong, the bridge pier or the capping beam can be damaged, and the bridge cannot be normally used.
Because the transverse stop block is a small component on the bridge, the attention degree to the design of the stop block is not high at home and abroad, and a few methods for repairing and reinforcing the bridge stop block after the bridge stop block is damaged are provided, and the existing reinforcing method is more complicated and most of the existing cover beam can cause certain damage. Therefore, it is necessary to provide a reasonable and practical anti-seismic reinforcing method for the transverse bridge stop.
Disclosure of Invention
The invention provides a brand-new anti-seismic reinforcing method for a transverse bridge stop block, aiming at the condition that the transverse anti-seismic stop block of a bridge is damaged but the normal use of a structure is not influenced by the damage of other components or the condition that the transverse restraining capability of the stop block is too weak due to the weak design of the original stop block, so as to make up the defects of the existing anti-seismic reinforcing method and technology for the stop block.
A bridge transverse anti-seismic stop block repairing and reinforcing construction method is characterized by comprising the following steps:
s1, resetting the transverse displaced girder and replacing the bridge bearing;
s2, cutting the damaged transverse stop block on the existing cover beam, and performing cover processing on the cut surface;
s3, designing and manufacturing a new anti-seismic stop block assembly, and hoisting the assembly to two ends of the existing cover beam for positioning;
s4, splicing the new anti-seismic stop block and the existing cover beam by tensioning external prestressed reinforcements;
and S5, performing corrosion and rust prevention treatment on the in-vitro prestressed steel bars, the anchoring system and the like.
Further, in S1, for the girder that has undergone lateral displacement, the girder is pushed to the original design position, and the damaged support is replaced, and then a temporary construction platform is set up on the bent cap to facilitate the post-construction work of stretching and anchoring the external prestressed reinforcement; and for the existing weak stop block type, a temporary construction platform is directly erected.
Further, in S2, when the broken block or the existing weak block is cut, the cut surface is subjected to finish surface treatment after being cut and ground flat, so as to ensure that the steel bars in the bent cap are not corroded in the subsequent use process.
Further, in S3, a positioning member is reserved when the new anti-seismic stop assembly is manufactured in a factory or on site to ensure that the new stop assembly can be accurately hoisted and positioned at two ends of the existing capping beam and is kept stable in the subsequent prestress tensioning process. Meanwhile, the lower part of the new anti-seismic stop block assembly part is designed into a rotatable cambered surface so as to reduce the stress concentration effect which may occur in the rotation process of the anti-seismic stop block assembly part; two sides (along the longitudinal direction of the bridge deck) of the new anti-seismic stop block assembly part exceed two sides of the capping beam and are used for reserving in-vitro prestressed reinforcement tensioning and anchoring pore channels; and reserving the specific positions and the number of the prestressed ducts according to the actual situation of the site.
Further, in S3, a new anti-seismic stop block assembly prefabricated in a factory is stably transported to a construction site and then is hoisted and positioned; or hoisting a new anti-seismic stop block assembly prefabricated on site to the two ends of the cover beam by using a crane for positioning.
Further, S4 further includes the following construction steps:
s41, passing prestressed reinforcement through the prestressed duct of the new anti-seismic stop block assembly;
s42, after the prestressed reinforcement is positioned, installing an external prestressed special anchorage device system, and carrying out temporary anchoring;
and S43, installing and adjusting the prestress tensioning equipment after verification, and then performing prestress tensioning. In the method, the left side and the right side of the same-layer prestressed reinforcement are symmetrically tensioned, so that the uniform stress of a new anti-seismic stop block assembly is ensured;
and S44, after the in-vitro prestressed steel bar is tensioned to a design value, anchoring is carried out, and redundant prestressed steel bars are cut off.
Further, the method in S5 further includes the following steps:
and S51, performing in-vitro prestressed reinforcement protection treatment. For the area with severe environment, the sleeve is protected by filling and coating materials, the sleeve is arranged outside the steel bar, and after the prestressed steel bar is tensioned, the anti-corrosion materials are filled in the sleeve in a pressing mode to form double protection. The casing can be made of high-density polyethylene and polypropylene, and the filling material can be paraffin, butter, polymer cement slurry and the like; in areas with better environment, the tensioned prestressed steel bars are subjected to anti-corrosion treatment by spraying an epoxy resin coating and the like, or prestressed steel strands with protective skins or prestressed steel bars with protective skins are adopted;
and S52, performing protection treatment on the anchor system and the reserved hole channel after tensioning. For the anchorage device system, cutting off the redundant length of the prestressed reinforcement, coating anticorrosive paint on the anchorage device system and the surface of the bearing plate, and then pouring concrete for sealing the anchorage, wherein the minimum thickness of a protective layer of the concrete is 25 mm; and sealing the reserved hole channel, and filling paraffin or butter for sealing and corrosion prevention.
The invention has the following beneficial effects:
compared with the traditional method for reinforcing the capping beam by planting the ribs on the capping beam and pouring the new stop block on the vertical mold, the method for reinforcing the capping beam by the transverse stop block has the advantages that the damage to the existing capping beam can be greatly reduced, and the capping beam can be reinforced to a certain extent by the external prestress tensioned at the later stage.
Compared with the traditional stop block which is constructed on the cover beam in a cast-in-place mode, the anti-seismic stop block assembly part can be obtained by a factory customization or field manufacturing method, the construction period is short, the quality is more reliable, and the pollution to the environment can be reduced.
Compared with the traditional concrete block structure, the novel block and the capping beam are spliced by tensioning external prestressed reinforcements, and the characteristics of large ultimate tensile strength and high elastic modulus of post-tensioned prestressed reinforcements can be utilized to reduce the residual deformation after the earthquake and the corresponding repair cost.
The invention adopts the post external prestress tension anchoring technology, the new stop block assembly part can be made of materials such as Ultra High Performance Concrete (UHPC), high strength concrete or fully anti-corrosion steel, the durability of the stop block assembly part under the severe environment is better, and the stop block assembly part is a completely independent component, so that the post-period maintenance, the maintenance and the replacement are more convenient.
Drawings
Fig. 1 is a schematic structural elevation view of the present invention.
Fig. 2 is a schematic structural plan view of the present invention.
Fig. 3 is a schematic side view of the structure of the present invention.
FIG. 4 is a schematic view of a form of the stopper of the present invention.
FIG. 5 is a schematic view of the cutting mat surface of the breaking stop of the present invention.
Figure 6 is a schematic view of a engineered weakpoint stop according to the present invention.
Figure 7 is a schematic view of a cutting mat of the weak block according to the present invention.
FIG. 8 is a schematic view of the positioning of the stop blocks according to the present invention.
FIG. 9 is an illustration of the new anti-seismic stop assembly of the present invention (reference numerals a, b, c, d in the figures are 4 types of new anti-seismic stop assemblies, which are well suited for various applications).
FIG. 10 is a general view of the present invention.
In the figure: 1-new anti-seismic block assembly parts, 2-capping beams, 3-main beams, 4-pre-stressed reinforcement channels, 5-pre-stressed reinforcements, 6-anchoring systems, 7-damaged blocks, 8-designed weak blocks, 9-supports and 10-positioning members pre-reserved on the new anti-seismic block assembly parts.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustration and are not intended to limit the scope of the present invention.
Example 1:
as shown in fig. 4, 5, and 9, a method for seismic reinforcement of a bridge transverse block, in this embodiment, a method for rapid seismic reinforcement and repair after a bridge transverse block is damaged is provided. The damage stopper 7 is suitable for common damages such as oblique shear damage, bending shear damage, flat shear damage and the like.
The anti-seismic reinforcing method of the bridge transverse stop block comprises the following steps:
s1, resetting the transverse displaced girder 3 and replacing the bridge bearing 9
S2, cutting the damaged transverse stop block 7 on the existing bent cap 2, and performing cover processing on the cut surface;
s3, designing and prefabricating a new anti-seismic stop block assembly 1, and hoisting the assembly to two ends of the existing cover beam 2 for positioning;
s4, splicing the new anti-seismic stop block assembly 1 and the existing cover beam 2 by tensioning the external prestressed reinforcement 5;
and S5, performing anticorrosive and antirust treatment on the prestressed reinforcement 5, the anchorage system 6 and the like.
Further, in S1, in the case of displacement of the main beam 3, the main beam 3 is pushed back and restored, the damaged support 9 is replaced, and a temporary construction platform is set up on the bent cap 2, so as to facilitate the later-stage external prestressed reinforcement 5 tensioning and anchoring construction work.
Further, in S2, if both ends of the bent cap 2 are damaged, the breakage stopper 7 is cut together with the damaged portions of both ends of the bent cap 2; and if the two ends of the bent cap 2 are not damaged, the damage stop 7 is cut, after cutting, the cut surface is ground and leveled, and then finish surface treatment is carried out to carry out rust-proof treatment on the reinforcing steel bars in the bent cap 2, so that the reinforcing steel bars in the bent cap 3 cannot be rusted in the subsequent use process, and the mechanical property is not influenced.
Further, S3 further includes the following construction steps:
s31, reserving a positioning member 10 when the new anti-seismic stop block assembly 1 is manufactured in a factory or on site, enabling the new anti-seismic stop block assembly 1 to be stably placed at two ends of a cover beam without falling off, and keeping stability in the subsequent tensioning process;
s32, when the new anti-seismic block assembly 1 is prefabricated, determining the type of the anti-seismic block assembly 1 according to the damage conditions of the two ends of the on-site bent cap 2 and the form of the web plate of the main beam 3;
and S33, if the two ends of the bent cap 2 are damaged, selecting two new anti-seismic block assembly parts 1 of a and b in the figure 9, and completing the cut bent cap. If the two ends of the cover beam 2 are not damaged, selecting two new anti-seismic block assembly parts 1 of c and d in the figure 9;
s34, the new anti-seismic stop assemblies 1 in fig. 9 a and c are suitable for the main beam 3 being a diagonal web box beam or a T beam, and the new anti-seismic stop assemblies 1 in fig. 9 b and d are suitable for the main beam 3 being a straight web box beam or a T beam;
s35, the lower part of the new anti-seismic stop block assembly 1 needs to be designed into a rotatable cambered surface shape to ensure that stress concentration is reduced as much as possible in the rotation process of the new anti-seismic stop block assembly 1;
s36, both sides of the new anti-seismic stop block assembly 1 exceed both sides of the bent cap and are used for reserving in-vitro prestressed reinforcement tensioning and anchoring pore canals; the number of the pre-stressed ducts is reserved according to the actual situation and is determined according to the actual situation of the site.
Further, S4 further includes the following construction steps:
s41, pre-stressed steel bars 5 penetrate through pre-stressed channels 4 of the new anti-seismic stop block assembly 1;
s42, installing a special external prestressed anchorage device system 6 after the prestressed reinforcement 5 is positioned, and anchoring the prestressed reinforcement 5;
and S43, tensioning the prestressed reinforcement by adopting prestressed tensioning equipment. The construction method adopts the simultaneous symmetrical tensioning of the prestressed reinforcements 5 on the left side and the right side of the same layer so as to ensure the uniformity and stability of the new anti-seismic stop block assembly part 1;
and S44, cutting the redundant length of the prestressed steel bar 5 after the external prestressed steel bar 5 is tensioned and anchored.
Further, the method in S5 further includes the following steps:
and S51, performing in-vitro prestressed reinforcement 5 protection treatment. For the areas with severe environment, the sleeve is adopted to be protected by filling and coating materials, the sleeve is arranged outside the steel bar, and after the prestressed steel bar 5 is tensioned, the anti-corrosion materials are filled in the sleeve in a pressing mode to form double protection. The casing can be made of high-density polyethylene and polypropylene, and the filling material can be paraffin, butter, polymer cement slurry and the like; in areas with good environment, the tensioned prestressed steel bars 5 are subjected to anti-corrosion treatment by spraying epoxy resin coatings and the like, or prestressed steel strands with protective skins or prestressed steel bars with protective skins are adopted;
and S52, performing protection treatment on the anchor system 6 and the reserved hole channel 4 after tensioning. For the anchorage device system, cutting off the redundant length of the prestressed reinforcement 5, coating anticorrosive paint on the surfaces of the anchorage device system and the bearing plate, and then later pouring concrete to perform anchorage sealing treatment on the anchorage device system 6, wherein the minimum thickness of an anchorage sealing concrete layer is 25 mm; and sealing the reserved hole 4, and filling paraffin or butter for sealing and corrosion prevention.
Example 2:
as shown in fig. 6, 7 and 9, the method for seismic strengthening of the bridge transverse block is suitable for the case that the transverse restraining capacity of the weak block 8 is too weak.
The anti-seismic reinforcing method for the bridge transverse stop block is characterized by comprising the following steps of:
s1, checking whether the main beam 3 is displaced and whether the support 9 is damaged, if so, resetting the main beam 3, and further
Replacing the support 9;
s2, cutting off the transverse stop block 8 with weak design on the bent cap 2, and performing cover processing on the cut surface;
s3, designing and manufacturing a new anti-seismic stop block assembly 1, and hoisting the assembly to two ends of the existing bent cap 2 for positioning;
s4, splicing the new anti-seismic stop block assembly 1 and the existing cover beam 2 by tensioning the external prestressed reinforcement 5;
and S5, performing anticorrosive and antirust treatment on the prestressed reinforcement 5, the anchorage system 6 and the like.
Further, in S1, whether the main beam 3 is displaced and the support 9 is damaged or not is checked, if the main beam is displaced, the main beam 3 is reset, the support 9 is replaced, and a temporary construction platform is set up on the existing bent cap 2, so as to facilitate the later-stage stretching and anchoring construction operation of the external prestressed reinforcement 5.
Further, in S2, the transverse stopper 8 with a weak design is cut, the cut surface is finished after being cut and ground, and the reinforcing steel bars in the existing bent cap 2 are subjected to rust prevention treatment, so that the reinforcing steel bars in the existing bent cap 2 are prevented from being rusted in the subsequent use process, and the mechanical properties of the reinforcing steel bars are not affected.
Further, S3 further includes the following construction steps:
s31, reserving a positioning member when the new anti-seismic stop block assembly 1 is manufactured in a factory or on site, enabling the new anti-seismic stop block assembly 1 to be stably placed at two ends of a cover beam without falling off, and keeping stability in the subsequent tensioning process;
s32, when the new anti-seismic block assembly 1 is manufactured, determining the type of the new anti-seismic block assembly 1 according to the distance between the main beam 3 and the new anti-seismic block assembly 1 on the existing bent cap 2 and the form of the web plate of the main beam 3 on the construction site;
s33, the new anti-seismic block assembly 1 of a and c in the figure 9 is suitable for the box girder structure of which the main girder 3 is a diagonal web, and the new anti-seismic block assembly 1 of b and d in the figure 9 is suitable for the box girder or the T girder structure of which the main girder 3 is a straight web;
s34, the lower end of the new anti-seismic stop block assembly 1 needs to be designed into a rotatable cambered surface shape so as to reduce the stress concentration effect possibly occurring in the rotation process of the new anti-seismic stop block assembly 1 as much as possible;
s35, two sides of the new anti-seismic stop block assembly 1 exceed two sides of the bent cap and are used for arranging the external prestressed duct 4 and the corresponding anchoring position; the number and the specific positions of the pre-stressed ducts 4 are determined according to the actual situation of the site.
Further, S4 further includes the following construction steps:
s41, pre-stressed steel bars 5 penetrate through pre-stressed channels 4 of the new anti-seismic stop block assembly 1;
s42, installing a special anchorage system 6 after the prestressed reinforcement 5 is positioned, and anchoring the prestressed reinforcement 5;
and S43, tensioning the prestressed reinforcement by adopting prestressed tensioning equipment. The construction method adopts the simultaneous symmetrical tensioning of the prestressed reinforcements 5 on the left side and the right side of the same layer so as to ensure the uniform stress of the new anti-seismic stop block assembly part 1;
and S44, cutting off the redundant length of the prestressed steel bar 5 after the external prestressed steel bar 5 is tensioned and anchored.
Further, the method in S5 further includes the following steps:
and S51, performing in-vitro prestressed reinforcement 5 protection treatment. For the areas with severe environment, the sleeve is adopted to be protected by filling and coating materials, the sleeve is arranged outside the steel bar, and after the prestressed steel bar 5 is tensioned, the anti-corrosion materials are filled in the sleeve in a pressing mode to form double protection. The casing can be made of high-density polyethylene and polypropylene, and the filling material can be paraffin, butter, polymer cement slurry and the like; in areas with good environment, the tensioned prestressed steel bars 5 are subjected to anti-corrosion treatment by spraying epoxy resin coatings and the like, or prestressed steel strands with protective skins or prestressed steel bars with protective skins are adopted;
and S52, performing protection treatment on the tensioned anchorage device system 6 and the prestressed duct 4. For the anchorage device system, cutting off the redundant length of the prestressed reinforcement 5, coating anticorrosive paint on the surfaces of the anchorage device system and the bearing plate, and then later pouring concrete to perform anchorage sealing treatment on the anchorage device system 6, wherein the minimum thickness of an anchorage sealing concrete layer is 25 mm; and sealing the reserved hole 4, and filling paraffin or butter for sealing and corrosion prevention.
Claims (8)
1. The anti-seismic reinforcing method for the bridge transverse stop block is characterized by comprising the following steps of:
s1, resetting the transverse displaced girder (3) and replacing the bridge bearing (9);
s2, cutting the damaged transverse stop block (7) on the existing cover beam (2), and performing cover processing on the cut surface;
s3, designing and manufacturing a new anti-seismic stop block assembly (1), and hoisting the assembly to the two ends of the existing cover beam (2) for positioning;
s4, splicing the new anti-seismic stop block assembly piece (1) and the existing cover beam (2) by tensioning the external prestressed reinforcement (5);
and S5, performing anticorrosive and antirust treatment on the in-vitro prestressed reinforcement (5) and the anchoring system (6) thereof and the like.
2. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: the construction method is suitable for the seismic reinforcement of various broken transverse check blocks (7) of bridges and the seismic reinforcement of existing weak check blocks (8); and is suitable for different types of block failure modes, such as oblique shear failure, horizontal shear failure, bending failure and the like.
3. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: in S2, after the transverse block (7) which is damaged or the existing weak block (8) is cut off, the cut surface is coated with materials such as fine concrete, cement paste or asphalt, and the cut steel bar is prevented from being exposed and corroded.
4. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: in S3, the new anti-seismic stop assembly (1) may be made of Ultra High Performance Concrete (UHPC), high strength concrete, general concrete or steel, or may be a combined structure based on multiple materials.
5. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: in S3, corresponding positioning members (10) are reserved in the manufacturing process of the new anti-seismic stop assembly (1) so that the new anti-seismic stop assembly can be stably hung on the cutting surfaces at the two ends of the cover beam (2), and the lower part of the new anti-seismic stop assembly (1) is designed into a rotatable arc surface.
6. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: at S3, the dimensions of the new seismic stop assembly (1) are determined according to the actual size of the broken transverse stop (7) or existing weak stop (8), and the type and size of the in vitro prestressed reinforcement (5) and anchoring system (6).
7. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: in S4, pre-stressed ducts (4) reserved on the anti-seismic stop block assembly (1) are arranged on two side portions of the existing cover beam (2), the number and specific positions of the pre-stressed ducts (4) are determined according to actual conditions on site, and holes do not need to be punched in the existing cover beam (2).
8. An earthquake-resistant reinforcing method for a bridge transverse baffle block according to claim 1, characterized in that: in S4, the external prestressed reinforcement (5) may be made of a material such as a twisted steel bar, a steel strand, or a memory alloy.
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| CN201911240808.6A CN110777682A (en) | 2019-12-06 | 2019-12-06 | Anti-seismic reinforcing method for bridge transverse stop block |
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| CN201911240808.6A CN110777682A (en) | 2019-12-06 | 2019-12-06 | Anti-seismic reinforcing method for bridge transverse stop block |
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