CN109295864B - Structure and method for carrying out shear strengthening on hollow slab by utilizing hinge joint space - Google Patents
Structure and method for carrying out shear strengthening on hollow slab by utilizing hinge joint space Download PDFInfo
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- CN109295864B CN109295864B CN201710605012.0A CN201710605012A CN109295864B CN 109295864 B CN109295864 B CN 109295864B CN 201710605012 A CN201710605012 A CN 201710605012A CN 109295864 B CN109295864 B CN 109295864B
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- hollow slab
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005728 strengthening Methods 0.000 title claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 10
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 73
- 239000010959 steel Substances 0.000 claims description 73
- 239000004568 cement Substances 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000011120 plywood Substances 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 2
- 238000005553 drilling Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 201000010099 disease Diseases 0.000 abstract description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a shear-resistant reinforcing structure and a shear-resistant reinforcing method for a hollow slab by utilizing a hinge joint space, which relate to the technical field of bridge engineering maintenance and reinforcement and comprise the following steps: 1. chiseling the old bridge hinge joint reconstruction; 2. a step of fixing the U-shaped stirrups of the hinge joints; 3. the invention can improve the shear bearing capacity of the hollow slab bridge structure by 20% -40%, and improve the transverse connection capacity between the hollow slabs, and the invention has the advantages of low reconstruction cost, material saving, simple and practical construction method in the old bridge reinforcement process, and can effectively reduce the hidden danger of bridge diseases in the new bridge design and reduce the tube maintenance cost in the operation period.
Description
Technical Field
The invention relates to the technical field of bridge engineering maintenance and reinforcement, in particular to a shear-resistant reinforcing structure and method for hollow slabs by utilizing hinge joint spaces.
Background
The concrete hollow slab has the advantages of convenience in prefabrication, mature process and the like, is suitable for bridges with medium and small spans, and is widely applied to highway bridge construction. Before the 90 th century, the old bridge hollow slab of the highway in China has certain technical defects in the aspects of using materials, bridge design, construction and the like. Along with the influence of factors such as load level improvement, frequent heavy truck action and the like, the maintenance management is improper, and the problem of insufficient bearing capacity of a large number of hollow slabs in service begins to appear. For such hollow plates, if the demolition reconstruction is directly carried out, the cost is higher, and the reconstruction period is longer. The method adopts proper reinforcement technology to reinforce the steel plate, so that not only is economic waste avoided, but also the reliability in the service period of the steel plate can be ensured.
Disclosure of Invention
In order to solve the defects in the prior art, the invention discloses a structure and a method for reinforcing the hollow slab by utilizing a hinge joint space, which can effectively improve the shearing resistance of a hollow slab bridge, greatly save the manufacturing cost, shorten the construction period and reduce the environmental pollution.
The technical scheme provided by the invention is as follows: the utility model provides an utilize hinge joint space to carry out hollow slab shear strengthening structure, includes hollow slab, its technical essential is: a U-shaped stirrup is arranged between two adjacent hollow plates, a U-shaped short steel bar is arranged at the upper end of the U-shaped stirrup, a hollow plate chiseling part is arranged at the lower end of the U-shaped stirrup, transverse steel bars and longitudinal steel bars are respectively arranged at the upper side and the lower side of the U-shaped short steel bar, a hollow plate stirrup is arranged below the hollow plate, and a hollow plate longitudinal steel bar is arranged at the inner side of the hollow plate chiseling part.
The hollow slab chiseling part is a hollow slab horseshoe part.
The original longitudinal steel bars of the hollow slab are the original longitudinal steel bars at the horseshoe position of the hollow slab.
The hinge joint longitudinal steel bar is bound on the inner side of the U-shaped stirrup of the hinge joint.
The bridge deck longitudinal steel bars are arranged below the bridge deck transverse steel bars.
The welding overlap joint length of the U-shaped short steel bar and the U-shaped stirrup is not less than 10 times of the diameter of the steel bar.
The U-shaped stirrup is an HRB 335-level ribbed steel bar with the diameter of 10-14mm, the transverse dimension of the U-shaped stirrup is larger than the distance between the longitudinal steel bars at the horseshoe position of the adjacent hollow slab by 15-20mm, and the vertical dimension is larger than the distance between the steel bars at the horseshoe position and the longitudinal steel bars at the cement pavement layer by 15-20mm.
The invention has the advantages that: the invention fully utilizes the hinge joint space of the hollow slab to add stirrups, can improve the shear bearing capacity of the hollow slab bridge structure by 20% -40%, and improve the transverse connection capacity between the hollow slabs, and the invention has low reconstruction cost, material saving, simple and practical construction method in the old bridge reconstruction process, can effectively reduce the hidden danger of bridge diseases in the new bridge design, and reduces the tube maintenance cost in the operation period.
Drawings
FIG. 1 is a schematic view of a bridge deck pavement and hinge joint chisel-out section;
FIG. 2 is a cross-sectional view of a hollow slab with concrete removed;
fig. 3 is a schematic diagram of the positions of longitudinal steel bars of an original bridge hollow slab;
fig. 4 is a sectional layout view of a hinge joint reinforcing bar;
fig. 5 is a hinge joint rebar floor plan;
in the figure: 1-a hollow slab; 2-bridge deck pavement and hinge joint chiseling part; 3-chiseling the hollow slab; 4-hollow slab stirrups; 5-hollow slab longitudinal steel bars; 6-U-shaped stirrups; 7, adding a common longitudinal steel bar; 8-short steel bars; 9-paving longitudinal steel bars on the bridge deck; 10-U-shaped short steel bars; 11-bridge deck pavement transverse steel bars.
Detailed Description
The present invention will be described in further detail with reference to examples in order to make the objects and advantages of the present invention more apparent. The technical scheme of the invention is as follows: the utility model provides an utilize hinge joint space to carry out hollow slab shear strengthening structure, includes hollow slab 1, wherein: a U-shaped stirrup 6 is arranged between two adjacent hollow plates, a U-shaped short steel bar 10 is arranged at the upper end of the U-shaped stirrup, a hollow plate chiseling part 3 is arranged at the lower end of the U-shaped stirrup, a bridge deck pavement transverse steel bar 10 and a bridge deck pavement longitudinal steel bar 9 are respectively arranged at the upper side and the lower side of the U-shaped short steel bar, a hollow plate stirrup 4 is arranged below the hollow plates, and a hollow plate longitudinal steel bar 5 is arranged at the hollow plate chiseling part.
As shown in fig. 1 to 5, the embodiment of the invention provides a method for reinforcing a hollow slab by using a hinge joint space, which comprises the following steps:
step one: and (3) chiseling bridge deck pavement and hinge joint concrete of the section (figure 1) in a sheared section of the hollow slab which is required to be subjected to shearing reinforcement, chiseling concrete at the horseshoe position of the hollow slab (figure 2), exposing longitudinal steel bars (figure 3), and chiseling the surface of the hollow slab concrete.
Step two: as shown in fig. 4 and 5.
(a) Welding U-shaped stirrups and the exposed longitudinal stress steel bars of the original hollow plates (figure 4 a);
(b) Binding longitudinal common steel bars 7 (figure 4 b) with equal length with the shearing resistant reinforcing section at the vertical trisection position of the U-shaped stirrup;
(c) A short length of rebar 8 (fig. 4 c) is drilled into the top surface of the girder and then embedded with adhesive.
(d) Longitudinal steel bars 9 (fig. 4 d) fixing the cement pavement layer;
(e) Welding U-shaped short steel bars 10 at the openings of the U-shaped stirrups (fig. 4 e);
(f) Fixing the bridge deck pavement transverse rebars 11 (fig. 4 f);
step three: fixing a bamboo plywood at the opening of the hinge joint at the bottom of the hollow board to seal the gap between the two hollow boards; pouring a C50 mortar bottom die with the thickness of 5 cm; pouring hinge joint concrete and then fully vibrating; and (5) after the template at the bottom of the hinge joint is removed, pointing.
The hollow slab chiseling part is a hollow slab horseshoe part.
The original longitudinal steel bars of the hollow slab are the original longitudinal steel bars at the horseshoe position of the hollow slab.
The hinge joint longitudinal steel bar is bound on the inner side of the U-shaped stirrup of the hinge joint.
The bridge deck longitudinal steel bars are arranged below the bridge deck transverse steel bars.
The welding overlap joint length of the U-shaped short steel bar and the U-shaped stirrup is not less than 10 times of the diameter of the steel bar.
The U-shaped stirrup is an HRB 335-level ribbed steel bar with the diameter of 10-14mm, the transverse dimension of the U-shaped stirrup is larger than the distance between the longitudinal steel bars at the horseshoe position of the adjacent hollow slab by 15-20mm, and the vertical dimension is larger than the distance between the steel bars at the horseshoe position and the longitudinal steel bars at the cement pavement layer by 15-20mm.
Claims (4)
1. The utility model provides an utilize hinge joint space to carry out hollow slab shear strengthening structure, includes hollow slab, its characterized in that: a U-shaped stirrup is arranged between two adjacent hollow plates, a U-shaped short steel bar is arranged at the upper end of the U-shaped stirrup, a hollow plate chiseling part is arranged at the lower end of the U-shaped stirrup, transverse steel bars and longitudinal steel bars are respectively arranged at the upper side and the lower side of the U-shaped short steel bar, a hollow plate stirrup is arranged below the hollow plate, and a hollow plate longitudinal steel bar is arranged at the inner side of the hollow plate chiseling part;
the U-shaped stirrup is an HRB 335-level ribbed steel bar with the diameter of 10-14mm, the transverse dimension of the U shape is 15-20mm larger than the distance between the longitudinal steel bars at the horseshoe position of the adjacent hollow plate, and the vertical dimension is 15-20mm larger than the distance between the steel bars at the horseshoe position and the longitudinal steel bars of the cement pavement layer;
the reinforcing method comprises the following steps: step 1): chiseling bridge deck pavement and hinge joint concrete of a sheared section of the hollow slab to be subjected to shearing reinforcement, chiseling concrete at the horseshoe position of the hollow slab to expose longitudinal reinforcing steel bars, and chiseling the hollow slab concrete;
step 2): binding the U-shaped stirrups and the exposed longitudinal steel bars of the hollow plates; binding longitudinal common steel bars with equal length to the shearing resistant reinforcing section at the vertical trisection positions of the U-shaped stirrups; drilling holes on the top surface of the main beam, and implanting short steel bars with a certain length by using an adhesive; fixing longitudinal steel bars of the cement pavement layer; welding U-shaped short steel bars at the openings of the U-shaped stirrups; fixing bridge deck pavement transverse steel bars;
step 3): fixing a bamboo plywood at the opening of the hinge joint at the bottom of the hollow board to seal the gap between the two hollow boards; pouring a C50 mortar bottom die with the thickness of 5 cm; pouring hinge joint concrete and then fully vibrating; and (5) after the template at the bottom of the hinge joint is removed, pointing.
2. The shear reinforcement structure for hollow slab bridges using hinge joint spaces as set forth in claim 1, wherein: the welding overlap joint length of the U-shaped short steel bar and the U-shaped stirrup is not less than 10 times of the diameter of the steel bar.
3. A method for carrying out shear strengthening on a hollow slab by utilizing a hinge joint space is characterized in that: the method comprises the following steps: step 1): chiseling bridge deck pavement and hinge joint concrete of a sheared section of the hollow slab to be subjected to shearing reinforcement, chiseling concrete at the horseshoe position of the hollow slab to expose longitudinal reinforcing steel bars, and chiseling the hollow slab concrete;
step 2): binding the U-shaped stirrups and the exposed longitudinal steel bars of the hollow plates; binding longitudinal common steel bars with equal length to the shearing resistant reinforcing section at the vertical trisection positions of the U-shaped stirrups; drilling holes on the top surface of the main beam, and implanting short steel bars with a certain length by using an adhesive; fixing longitudinal steel bars of the cement pavement layer; welding U-shaped short steel bars at the openings of the U-shaped stirrups; fixing bridge deck pavement transverse steel bars;
step 3): fixing a bamboo plywood at the opening of the hinge joint at the bottom of the hollow board to seal the gap between the two hollow boards; pouring a C50 mortar bottom die with the thickness of 5 cm; pouring hinge joint concrete and then fully vibrating; and (5) after the template at the bottom of the hinge joint is removed, pointing.
4. A method for shear reinforcement of hollow slabs using hinge spaces as claimed in claim 3, wherein: the U-shaped stirrup is an HRB 335-level ribbed steel bar with the diameter of 10-14mm, the transverse dimension of the U-shape is 15-20mm larger than the distance between the longitudinal steel bars at the horseshoe position of the adjacent hollow plate, and the vertical dimension is 15-20mm larger than the distance between the steel bars at the horseshoe position and the longitudinal steel bars of the cement pavement layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710605012.0A CN109295864B (en) | 2017-07-24 | 2017-07-24 | Structure and method for carrying out shear strengthening on hollow slab by utilizing hinge joint space |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710605012.0A CN109295864B (en) | 2017-07-24 | 2017-07-24 | Structure and method for carrying out shear strengthening on hollow slab by utilizing hinge joint space |
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| Publication Number | Publication Date |
|---|---|
| CN109295864A CN109295864A (en) | 2019-02-01 |
| CN109295864B true CN109295864B (en) | 2023-10-31 |
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| CN201710605012.0A Active CN109295864B (en) | 2017-07-24 | 2017-07-24 | Structure and method for carrying out shear strengthening on hollow slab by utilizing hinge joint space |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112554066A (en) * | 2020-11-30 | 2021-03-26 | 中铁大桥局集团有限公司 | Construction method of steel-concrete composite beam and steel-concrete composite beam |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1405951A2 (en) * | 2002-10-04 | 2004-04-07 | Giuseppe Minerva | Foundation cast in situ with a concrete casing |
| CN103184723A (en) * | 2012-05-09 | 2013-07-03 | 金辉 | Method for reinforcing arch bridge with EPS Expandable Polystyrene light concrete |
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2017
- 2017-07-24 CN CN201710605012.0A patent/CN109295864B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1405951A2 (en) * | 2002-10-04 | 2004-04-07 | Giuseppe Minerva | Foundation cast in situ with a concrete casing |
| CN103184723A (en) * | 2012-05-09 | 2013-07-03 | 金辉 | Method for reinforcing arch bridge with EPS Expandable Polystyrene light concrete |
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| Publication number | Publication date |
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| CN109295864A (en) | 2019-02-01 |
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