CN112854024A - Construction method of bonded prestressed structure for reinforcing hollow slab bridge - Google Patents
Construction method of bonded prestressed structure for reinforcing hollow slab bridge Download PDFInfo
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- CN112854024A CN112854024A CN202110027580.3A CN202110027580A CN112854024A CN 112854024 A CN112854024 A CN 112854024A CN 202110027580 A CN202110027580 A CN 202110027580A CN 112854024 A CN112854024 A CN 112854024A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a construction method of a bonded prestressed structure for reinforcing a hollow slab bridge. The bonding prestressed structure is characterized in that an anchoring toothed plate is arranged at the bottom of the hollow slab; installing and tensioning three phi j8.6 steel strands; arranging shear ribs at the bottom of the plate and installing a steel wire mesh; high-strength tensile mortar is injected in batches in the areas of the prestressed tendons and the toothed plates. The bonded prestressed structure for reinforcing the hollow slab bridge is convenient and quick to construct, the bearing capacity of the hollow slab can be effectively improved through the prestressed steel strands and the tensile mortar applied to the bottom of the hollow slab, the section height is increased, the structural rigidity is improved, and the structural durability is obviously improved; compared with the traditional prestress reinforcing method, under the condition of improving the same bearing capacity level, the concrete reinforcing method has the advantages of simple structure and light dead weight, and can reduce the structural size of newly added concrete, reduce the added dead weight of the hollow slab and improve the prestress reinforcing effect.
Description
Technical Field
The invention belongs to the technical field of bridge engineering, and particularly relates to a construction method of a bonded prestressed structure for reinforcing a hollow slab bridge.
Background
The bonded prestressed reinforcement technology is characterized in that a small-diameter prestressed steel twisted wire anchored on a reinforced beam is adopted to apply prestress on a beam body, and then high-strength tensile mortar is injected to form a bonded prestressed reinforcement structure. The bottom of the hollow slab is additionally provided with prestressed tendons, the number of the prestressed tendons is determined by the stress requirement, and the length of the prestressed tendons is determined according to the bending resistance bearing capacity requirement of each section of the beam body; after the prestressed tendons are tensioned, high-strength tensile mortar is injected at the bottom of the hollow slab, and the prestressed tendons and the web plates are bonded into a whole to form a bonded prestressed reinforcement structure.
The prior common bridge hollow slab reinforcing method comprises the following steps: firstly, adhering a steel plate for reinforcement; secondly, the section is increased and reinforced; thirdly, pasting carbon fiber cloth for reinforcement; fourthly, reinforcing the external prestress; reinforcing the bridge deck reinforcing layer. In the method, firstly, the steel plate falls off due to the fact that the adhesive steel glue is easy to age and crack, and the steel plate needs to be subjected to corrosion prevention treatment regularly in the later period; the method obviously increases the self weight and the size of the original structure, is not necessarily beneficial to the stress of the structure, can reduce the height under the bridge and influences the traffic capacity under the bridge; the method belongs to passive reinforcement, and the structural rigidity of the hollow plate cannot be improved by sticking the carbon fiber cloth; the method can effectively improve the bearing capacity of the structure, but has no effect on improving the rigidity of the structure; the method is time-consuming and labor-consuming in construction, requires a longer time for closing the bridge, has a large influence on driving, and is poor in economy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a construction method of a bonded prestressed structure for reinforcing a hollow slab bridge.
The technical scheme is as follows:
a construction method of a bonded prestressed structure for reinforcing a hollow slab bridge comprises the following steps:
firstly, manufacturing and installing an anchoring toothed plate, paying off at the bottom of a beam to determine the position of a steel strand, and then carrying out shear bar planting construction, wherein the steel strand is avoided at the steel strand planting position; secondly, after the steel bar planting and the bonding steel glue solidification, penetrating a prestressed steel strand and carrying out primary fixing, carrying out pretensioning to straighten the steel strand, and carrying out tensioning on the prestressed steel strand after the installation work is finished; thirdly, injecting high-strength tensile mortar within the range of the prestressed steel strands and the anchoring toothed plate, and injecting the tensile mortar in layers; fourthly, after the prestressed steel strands are completely buried in the mortar, the steel wire mesh is hung at the end of the shear rib and is bound and connected with the shear shears; and fifthly, performing water spraying maintenance on the anti-pulling mortar after the injection is finished, and ensuring that the injection construction surface is wet until the mortar is hardened.
Furthermore, the anchoring toothed plate is formed by a connecting steel plate, a supporting steel plate and a counterfort steel plate in a welding mode.
Furthermore, the single-layer thickness of the tensile mortar in layered injection is less than 2 cm.
Furthermore, the end part of the buttress steel plate is provided with a steering steel bar.
Compared with the prior art, the bonded prestressed structure suitable for reinforcing the hollow slab bridge is convenient and quick to construct, the bearing capacity of the hollow slab can be effectively improved through the prestressed steel strands and the tensile mortar applied to the bottom of the hollow slab, the section height is increased, the structural rigidity is improved, and the structural durability is obviously improved; compared with the traditional prestress reinforcing method, under the condition of improving the same bearing capacity level, the concrete reinforcing method has the advantages of simple structure and light dead weight, and can reduce the structural size of newly added concrete, reduce the added dead weight of the hollow slab and improve the prestress reinforcing effect.
Drawings
FIG. 1 is a schematic view of the arrangement of the bonded prestressed structure for hollow slab bridge reinforcement in elevation;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of the configuration B of FIG. 2;
figure 4 is an elevational view of the anchor tooth plate;
figure 5 is a plan view of the anchor tooth plate;
FIG. 6 is a rough view of the connecting steel plate;
FIG. 7 is a thumbnail view of a buttress plate;
FIG. 8 is a diagrammatic illustration of a support steel plate;
fig. 9 is a schematic cross-sectional view of C-C in fig. 8.
Description of reference numerals:
the steel wire mesh anchoring structure comprises an anchoring toothed plate-1, anchor bolts-2, phi j8.6 steel strands-3, shear ribs-4, a steel wire mesh-5, high-strength tensile mortar-6, a hollow plate-7, a connecting steel plate-8, a supporting steel plate-9, a buttress steel plate-10 and steering steel bars-11.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail a bonded prestressed structure for hollow slab bridge reinforcement according to the present invention with reference to the following embodiments.
Example 1
A construction method of a bonded prestressed structure for reinforcing a hollow slab bridge comprises the following steps: firstly, manufacturing and installing an anchoring toothed plate according to a design drawing, paying off at the bottom of a beam to determine the position of a steel strand, and then carrying out shear bar planting construction, wherein the steel strand is avoided at the steel strand planting position; secondly, after bar planting and steel adhesive solidification, penetrating prestressed steel strands, preliminarily fixing, and pre-tensioning to straighten the steel strands; tensioning the prestressed steel strand after the installation work is finished; thirdly, injecting high-strength tensile mortar in the range of the prestressed steel strands and the anchoring toothed plate. The tensile mortar is injected in layers, and the thickness of each injection is not more than 2 cm; fourthly, after the prestressed steel strands are completely buried in the mortar, the steel wire mesh is hung at the end of the shear rib and is bound and connected with the shear shears; and fifthly, performing water spraying maintenance on the anti-pulling mortar after the injection is finished, and ensuring that the injection construction surface is wet until the mortar is hardened.
Referring to fig. 1 and 2, a bonded prestressed structure for hollow slab bridge reinforcement, comprising: the steel wire mesh anchoring device comprises an anchoring toothed plate 1, anchor bolts 2, phi j8.6 steel strands 3, shear ribs 4, a steel wire mesh 5 and high-strength tensile mortar 6.
The anchoring toothed plates 1, the phi j8.6 steel strands 3 and the high-strength tensile mortar 6 form an integral bearing structure together. And (3) performing chiseling treatment on an area of the bottom of the hollow slab 7 sprayed with the high-strength tensile mortar 6, and cleaning floating dust and impurities on the surface. And manufacturing and installing the anchoring toothed plate 1, and simultaneously carrying out bar planting construction on the shear bars 4. After installing and tensioning the phi j8.6 steel strand 3, high-strength tensile mortar 6 is sprayed in layers in the range of the phi j8.6 steel strand 3 and the anchoring toothed plate 1. The steel wire mesh 5 is bound and connected with the shear bar 4 after the high-strength tensile mortar 6 is completely buried in the phi j8.6 steel stranded wires 3.
The anchoring toothed plate 1 is formed by welding a connecting steel plate 8, a supporting steel plate 9 and a buttress steel plate 10; the anchoring toothed plate 1 is fixed on the bottom of the reinforced hollow plate 7 by adopting a mode of combining anchor bolts 2 with cementation. The size of the anchoring toothed plate 1 and the number of anchor bolts 2 are determined according to the stress requirement of prestress, and if necessary, the size and the number of anchor bolts are determined according to the test result; in order to reduce the thickness of the high-strength tensile mortar 6, a steering steel bar 11 is arranged at the end part of the buttress steel plate 10.
The phi j8.6 steel strand 3 and the bottom of the hollow plate 7 are bonded into a whole by a bonded prestressed reinforcement structure through injected high-strength tensile mortar 6. The high-strength tensile mortar 6 is a foundation for ensuring the phi j8.6 steel strands 3 and the hollow plate 7 to work together, and protects the phi j8.6 steel strands 3 from corrosion; the high-strength tensile mortar 6 is sprayed layer by layer, the spraying thickness is related to the arrangement condition of the phi j8.6 steel strands 3, and the spraying thickness is generally not more than 2cm at each time.
The anchoring toothed plate is customized in a factory according to requirements, the specific model size and the number of anchor bolts are determined according to the stress requirement of prestress, and if necessary, the anchoring toothed plate is determined according to a test result.
Engineering practices show that compared with the common reinforcement technologies such as steel plate adhesion and carbon fiber adhesion, the reinforcement structure provided by the invention has the advantages that the reinforcement structure is more economical under the condition of improving the bearing capacity under the condition that the reinforcement structure is suitable for reinforcing the hollow slab bridge. The reinforced hollow slab bridge can increase the section height, improve the structural rigidity, obviously improve the structural durability and has small change of the appearance of the structure before and after construction.
The present invention is not limited to the above-described examples, and various changes can be made without departing from the spirit and scope of the present invention within the knowledge of those skilled in the art.
Claims (4)
1. A construction method of a bonded prestressed structure for reinforcing a hollow slab bridge is characterized by comprising the following steps:
firstly, manufacturing and installing an anchoring toothed plate, paying off at the bottom of a beam to determine the position of a steel strand, and then carrying out shear bar planting construction, wherein the steel strand is avoided at the steel strand planting position; secondly, after the steel bar planting and the bonding steel glue solidification, penetrating a prestressed steel strand and carrying out primary fixing, carrying out pretensioning to straighten the steel strand, and carrying out tensioning on the prestressed steel strand after the installation work is finished; thirdly, injecting high-strength tensile mortar within the range of the prestressed steel strands and the anchoring toothed plate, and injecting the tensile mortar in layers; fourthly, after the prestressed steel strands are completely buried in the mortar, the steel wire mesh is hung at the end of the shear rib and is bound and connected with the shear shears; and fifthly, performing water spraying maintenance on the anti-pulling mortar after the injection is finished, and ensuring that the injection construction surface is wet until the mortar is hardened.
2. The construction method of the bonded prestressed structure for hollow slab bridge reinforcement according to claim 1, wherein the anchoring toothed plate is formed by welding the connecting steel plate, the supporting steel plate and the buttress steel plate.
3. The method of constructing a structure having a bonded prestress for hollow slab bridge reinforcement according to claim 2, wherein a turn bar is provided to an end of the buttress steel plate.
4. The method for constructing a bonded prestressed structure for hollow slab bridge reinforcement according to claim 1, wherein the tensile mortar is injected in layers with a single thickness of less than 2 cm.
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| CN202110027580.3A CN112854024A (en) | 2021-01-10 | 2021-01-10 | Construction method of bonded prestressed structure for reinforcing hollow slab bridge |
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| CN202110027580.3A CN112854024A (en) | 2021-01-10 | 2021-01-10 | Construction method of bonded prestressed structure for reinforcing hollow slab bridge |
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2021
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