CN112064522A - Method for reinforcing micro bent plate bridge floor of reinforced concrete V-shaped pier steel bridge - Google Patents
Method for reinforcing micro bent plate bridge floor of reinforced concrete V-shaped pier steel bridge Download PDFInfo
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- CN112064522A CN112064522A CN202010946112.1A CN202010946112A CN112064522A CN 112064522 A CN112064522 A CN 112064522A CN 202010946112 A CN202010946112 A CN 202010946112A CN 112064522 A CN112064522 A CN 112064522A
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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 relates to the technical field of steel bridge structures, in particular to a reinforced concrete V-shaped pier steel bridge micro-bent plate bridge floor reinforcing method. The method comprises the steps of dismantling a current bridge deck, arranging a plurality of I-shaped steels, installing a hanging die, pouring a first layer of steel fiber concrete and pouring a surface layer of steel fiber concrete. The reinforcing method can repair the micro bent plate bridge deck structure of the reinforced concrete V-shaped pier steel bridge, improve the safety of the steel bridge and prolong the service life of the steel bridge; the first layer of steel fiber concrete and the surface layer of steel fiber concrete are prefabricated in a whole cast-in-place mode in a span and block mode, and the problem that cracks are generated due to the fact that boundary conditions of prefabricated micro-bent plates are easy to change is solved from a structural source; the bridge deck is dismantled and is adopted segmentation drilling to combine cutting machine and long armed hoist, has reduced the load of construction period, and furthest reduces the damage to bridge major structure.
Description
Technical Field
The invention relates to the technical field of steel bridge structures, in particular to a reinforced concrete V-shaped pier steel bridge micro-bent plate bridge floor reinforcing method.
Background
The reinforced concrete V-shaped pier rigid bridge is optimized on the basis of truss arch, rigid frame arch and other bridge types, and has the advantages of less number of members, small self weight, low cost, large navigation clearance, lower requirement on foundation than that of arch bridge, etc. The upper structure of the reinforced concrete V-shaped pier rigid bridge mainly comprises rigid frame pieces, transverse tie beams, micro bent plates and the like. The arrangement of the steel frame pieces mainly depends on the span size and the load grade of the bridge. The micro-bending plate is commonly used for truss arches, rigid frame bridges and I-shaped beam bridge decks, and is divided into a prefabricated arch type plate and a few-rib micro-bending plate. The prefabricated arch type micro-bent plate is composed of a prefabricated arch type plate and a cast-in-place concrete filling layer, and the prefabricated arch type micro-bent plate is generally fixedly connected with an upper beam piece through a reserved steel bar at a pivot, so that the prefabricated arch type micro-bent plate has the advantages of convenience and quickness in construction, low manufacturing cost, short construction period and the like.
After the reinforced concrete V-shaped pier rigid bridge is used for a long time, a large number of transverse cracks and pits exist in the bridge deck pavement, the strength and the integrity are poor, and the micro bent plates are difficult to effectively and cooperatively bear the vehicle load; meanwhile, the accumulated water on the bridge surface seeps downwards along the cracks to corrode the micro bent plate, so that the damage of the micro bent plate is further aggravated. Therefore, after the reinforced concrete V-shaped pier rigid bridge is used for a long time, potential safety hazards exist, and the bridge deck needs to be reinforced again.
Disclosure of Invention
The applicant aims at the defects in the prior art and provides a reinforced concrete V-shaped pier steel bridge micro-bent plate bridge deck reinforcing method with a reasonable structure, which can repair a reinforced concrete V-shaped pier steel bridge micro-bent plate bridge deck structure and improve the safety and service life of a steel bridge.
The technical scheme adopted by the invention is as follows:
a reinforced concrete V-shaped pier steel bridge micro-bent plate bridge deck reinforcing method comprises the following steps:
demolishing a current bridge deck, namely demolishing a bridge deck pavement layer of an old bridge, when demolishing the bridge deck pavement layer, performing segmented drilling on the bridge deck pavement layer by using a concrete splitter to break holes, searching for free ends of anchoring reinforcing steel bars and avoiding the free ends of the anchoring reinforcing steel bars during drilling, and flexibly determining hole distribution positions according to the free ends of the anchoring reinforcing steel bars; removing the micro bent plate of the old bridge, cutting off the steel bar connection of the micro bent plate and the tenon of the rigid frame beam piece by using a cutting machine when removing the micro bent plate, and then hanging and removing the cut micro bent plate by using a long-arm crane;
after the existing bridge deck is dismantled, arranging a plurality of I-shaped steels at equal intervals along the width direction of the old bridge on the upper part of a tenon at the top of a rigid frame bare beam piece of the main beam of the old bridge;
after the I-shaped steel is arranged, a hanging die is installed on the I-shaped steel and comprises a hanging rib and a template, the template is arranged under the steel frame bare beam, the lower part of the hanging rib is fixedly connected with the template, the upper part of the hanging rib is fixedly connected to the I-shaped steel, and the installation of the hanging die is finally realized after the hanging rib is fixed;
after the hanging die is installed, pouring a first layer of steel fiber concrete on a template of the hanging die, then carrying out field test on the strength of the first layer of steel fiber concrete, dismantling the template of the hanging die when the strength test of the first layer of steel fiber concrete reaches 80% of the designed strength, and cutting the hanging ribs to be 5cm below the designed elevation;
and after the hanging die is dismantled, pouring surface layer steel fiber concrete on the upper end surface of the first layer of steel fiber concrete, after the surface layer steel fiber concrete is constructed, testing the strength of the surface layer steel fiber concrete, and opening bridge floor traffic when the strength of the surface layer steel fiber concrete reaches the designed strength.
Furthermore, in the current situation bridge deck slab dismantling process, the anchoring reinforcing steel bars connected with the bridge deck pavement layer, the micro bent plates and the main beam are reserved, and the anchoring reinforcing steel bars cannot be cut off.
Further, the drill hole spacing is 20 cm.
Further, slag removal is assisted by an air pick after the drilling is completed.
Further, the distance between two adjacent I-shaped steel ranges from 3M to 5M.
Furthermore, the hanging steel bars are No. 12-16 steel bars.
Further, the thickness of the first layer of steel fiber concrete is 15-18 cm.
Furthermore, the thickness range of the surface layer steel fiber concrete is 10-12 cm, and the surface layer steel fiber concrete adopts C40 steel fiber concrete with the mixing amount of 0.8%.
The invention has the following beneficial effects:
the reinforcing method can repair the micro bent plate bridge deck structure of the reinforced concrete V-shaped pier steel bridge, improve the safety of the steel bridge and prolong the service life of the steel bridge; the first layer of steel fiber concrete and the surface layer of steel fiber concrete are prefabricated in a whole cast-in-place mode in a span and block mode, and the problem that cracks are generated due to the fact that boundary conditions of prefabricated micro-bent plates are easy to change is solved from a structural source; the bridge deck is dismantled by adopting sectional drilling combined with a cutting machine and a long-arm crane, so that the load in the construction period is reduced, and the damage to the main structure of the bridge is reduced to the greatest extent; the bridge deck slab is poured in a layered mode by adopting a method of combining bridge deck I-steel with a hanging die, construction operation of erecting a scaffold in a river under a bridge is avoided, construction difficulty is reduced, construction period is shortened, engineering quality is guaranteed, and manufacturing cost is saved; the bridge deck roadway plate is made of steel fiber concrete, so that various non-structural cracks such as temperature, expansion and contraction are avoided as much as possible, and the durability of the bridge deck is improved.
Drawings
Fig. 1 is a schematic view of the present invention with a current deck slab removed.
Fig. 2 is a schematic view of the present invention for installing a suspended mold.
FIG. 3 is a schematic view of the present invention pouring a first layer of steel fiber concrete and a surface layer of steel fiber concrete.
Wherein: 1. a bridge deck pavement layer; 2. slightly bending the plate; 3. a main beam; 4. breaking the hole; 5. i-shaped steel; 6. hanging the ribs; 7. a template; 8. a first layer of steel fiber concrete; 9. surface layer steel fiber concrete.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The invention comprises the following steps:
1. demolishing a current bridge deck, as shown in fig. 1, demolishing a bridge deck pavement layer 1 of an old bridge, when demolishing the bridge deck pavement layer 1, performing segmented drilling on the bridge deck pavement layer 1 by using a concrete splitter to break holes 4, wherein the distance between the drilled holes is 20cm, searching for free ends of anchoring reinforcing steel bars and avoiding the free ends of the anchoring reinforcing steel bars during drilling, and flexibly determining hole distribution positions according to the free ends of the anchoring reinforcing steel bars; then removing the micro bent plate 2 of the old bridge, cutting off the connection of the micro bent plate and the steel bars of the tenon of the rigid frame beam piece by using a cutting machine when removing the micro bent plate 2, and then hoisting and removing the cut micro bent plate 2 by using a long-arm crane;
in the current situation of bridge deck slab dismantling process, the anchoring steel bars connected with the bridge deck pavement layer 1, the micro bent plates 2 and the main beams 3 are reserved, and the anchoring steel bars cannot be cut off; meanwhile, the air pick assists in removing slag after drilling is finished.
2. After the existing bridge deck is dismantled, arranging a plurality of I-shaped steels 5 on the upper part of a tenon at the top of a rigid frame bare beam piece of a main beam 3 of the old bridge at equal intervals along the width direction of the old bridge, wherein the distance between every two adjacent I-shaped steels 5 ranges from 3M to 5M;
the distance between two adjacent I-beams 5 depends on the factors such as the material characteristics of the template, the distance between the steel frame bare beam pieces, the construction conditions and the like, the type of the I-beam 5 is 15-20 #, and the type selection depends on the factors such as the distance between the I-beams, the distance between the steel frame beam pieces, the load in the construction period and the like.
3. After the I-shaped steel 5 is arranged, a hanging die is arranged on the I-shaped steel 5, as shown in fig. 2, the hanging die comprises hanging ribs 6 and a template 7, and the template 7 is arranged under the bare beam piece of the rigid frame. The lower part of the hanging rib 6 is fixedly connected with the template 7, the upper part of the hanging rib is fixedly connected with the I-shaped steel 5, and the hanging rib 6 is finally installed after being fixed;
in the process, the lifting rib 6 is a No. 12-16 steel bar.
4. After the hanging die is installed, as shown in fig. 3, a first layer of steel fiber concrete 8 is poured on a template 7 of the hanging die, the thickness of the first layer of steel fiber concrete 8 is 15-18 cm, then the strength of the first layer of steel fiber concrete 8 is tested on site, when the strength test of the first layer of steel fiber concrete 8 reaches 80% of the designed strength, the template 7 of the hanging die is detached, and the hanging ribs 6 are cut to be 5cm below the designed elevation.
5. After the suspended formwork is dismantled, as shown in fig. 3, a surface layer steel fiber concrete 9 is poured on the upper end surface of the first layer steel fiber concrete 8, and the thickness range of the surface layer steel fiber concrete 9 is 10-12 cm; the surface layer steel fiber concrete 9 adopts C40 steel fiber concrete with the mixing amount of 0.8 percent.
6. After the surface layer steel fiber concrete 9 is constructed, the surface layer steel fiber concrete 9 is subjected to strength test, and when the strength of the surface layer steel fiber concrete 9 reaches the design strength, bridge floor traffic is opened.
After the reinforcing construction is carried out through the process, the micro bent plate bridge deck structure of the reinforced concrete V-shaped pier steel bridge can be repaired, the safety of the steel bridge is improved, and the service life of the steel bridge is prolonged. The first layer of steel fiber concrete 8 and the surface layer of steel fiber concrete 9 are prefabricated in a whole cast-in-place mode by replacing span and block modes, and the problem that cracks are generated due to easy change of boundary conditions of the prefabricated micro-bent plate is solved from a structural source; the bridge deck is dismantled by adopting sectional drilling combined with a cutting machine and a long-arm crane, so that the load in the construction period is reduced, and the damage to the main structure of the bridge is reduced to the greatest extent; the bridge deck slab is poured in a layered mode by adopting a method of combining bridge deck I-steel with a hanging die, construction operation of erecting a scaffold in a river under a bridge is avoided, construction difficulty is reduced, construction period is shortened, engineering quality is guaranteed, and manufacturing cost is saved; the bridge deck roadway plate is made of steel fiber concrete, so that various non-structural cracks such as temperature, expansion and contraction are avoided as much as possible, and the durability of the bridge deck is improved.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (8)
1. A reinforced concrete V-shaped pier steel bridge micro-bent plate bridge deck reinforcing method is characterized by comprising the following steps:
demolishing a current bridge deck, namely demolishing a bridge deck pavement layer (1) of an old bridge, when demolishing the bridge deck pavement layer (1), drilling a demolition hole (4) on the bridge deck pavement layer (1) by sections by using a concrete splitter, searching a free end of an anchoring reinforcing steel bar and avoiding the free end of the anchoring reinforcing steel bar during drilling, and flexibly determining a hole distribution position according to the free end of the anchoring reinforcing steel bar; then removing the micro bent plate (2) of the old bridge, cutting off the connection of the micro bent plate (2) and the steel bars of the tenon of the rigid frame beam piece by using a cutting machine when removing the micro bent plate (2), and then hoisting and removing the cut micro bent plate (2) by using a long-arm crane;
after the existing bridge deck is dismantled, arranging a plurality of I-shaped steels (5) on the upper part of a tenon at the top of a rigid frame bare beam piece of a main beam (3) of the old bridge at equal intervals along the width direction of the old bridge;
after the I-shaped steel (5) is arranged, a hanging die is installed on the I-shaped steel (5), the hanging die comprises hanging ribs (6) and a template (7), the template (7) is arranged under the steel frame bare beam, the lower portion of each hanging rib (6) is fixedly connected with the template (7), the upper portion of each hanging rib is fixedly connected to the I-shaped steel (5), and the hanging die is installed finally after the hanging ribs (6) are fixed;
after the hanging die is installed, pouring a first layer of steel fiber concrete (8) on a template (7) of the hanging die, then carrying out field test on the strength of the first layer of steel fiber concrete (8), dismantling the template (7) of the hanging die when the strength test of the first layer of steel fiber concrete (8) reaches 80% of the designed strength, and cutting a hanging rib (6) to be 5cm below the designed elevation;
and after the suspended formwork is dismantled, pouring surface layer steel fiber concrete (9) on the upper end surface of the first layer steel fiber concrete (8), after the surface layer steel fiber concrete (9) is constructed, testing the strength of the surface layer steel fiber concrete (9), and opening bridge deck traffic when the strength of the surface layer steel fiber concrete (9) reaches the designed strength.
2. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate according to claim 1, which is characterized by comprising the following steps of: in the current situation deck slab dismantling process, the anchoring reinforcing steel bars connected with the bridge deck pavement layer (1), the micro bent plates (2) and the main beam (3) are reserved, and the anchoring reinforcing steel bars cannot be cut off.
3. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate according to claim 1, which is characterized by comprising the following steps of: the distance between the drill holes is 20 cm.
4. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate as claimed in claim 1 or 3, wherein the method comprises the following steps: and assisting in slag removal through an air pick after the drilling is finished.
5. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate according to claim 1, which is characterized by comprising the following steps of: the distance between two adjacent I-shaped steel (5) ranges from 3M to 5M.
6. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate according to claim 1, which is characterized by comprising the following steps of: the lifting rib (6) is a No. 12-16 steel bar.
7. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate according to claim 1, which is characterized by comprising the following steps of: the thickness of the first layer of steel fiber concrete (8) is 15-18 cm.
8. The method for reinforcing the bridge deck of the reinforced concrete V-shaped pier steel bridge micro bent plate according to claim 1, which is characterized by comprising the following steps of: the thickness range of the surface layer steel fiber concrete (9) is 10-12 cm, and the surface layer steel fiber concrete (9) is C40 steel fiber concrete with the mixing amount of 0.8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946112.1A CN112064522A (en) | 2020-09-10 | 2020-09-10 | Method for reinforcing micro bent plate bridge floor of reinforced concrete V-shaped pier steel bridge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010946112.1A CN112064522A (en) | 2020-09-10 | 2020-09-10 | Method for reinforcing micro bent plate bridge floor of reinforced concrete V-shaped pier steel bridge |
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| JPH0941325A (en) * | 1995-07-26 | 1997-02-10 | Sho Bond Constr Co Ltd | Bridge floor slab disassembling method and device |
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2020
- 2020-09-10 CN CN202010946112.1A patent/CN112064522A/en active Pending
Patent Citations (6)
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| JPH0941325A (en) * | 1995-07-26 | 1997-02-10 | Sho Bond Constr Co Ltd | Bridge floor slab disassembling method and device |
| CN102704406A (en) * | 2012-06-21 | 2012-10-03 | 东南大学 | Roadbed slab non-tensile stress construction method based on combined channel girder |
| CN103774563A (en) * | 2012-10-24 | 2014-05-07 | 陕西龙海工程建设有限公司 | Rigid frame arch bridge strengthening method |
| CN203188121U (en) * | 2013-03-01 | 2013-09-11 | 浙江省交通工程建设集团有限公司 | Cast-in-place bridge floor suspending mold of half-through or through arch bridge |
| CN109371823A (en) * | 2018-12-19 | 2019-02-22 | 北京市政路桥股份有限公司 | A kind of compound seismic reinforcing structure of V-type bridge pier |
| CN110509417A (en) * | 2019-07-30 | 2019-11-29 | 中铁上海工程局集团有限公司 | A kind of floorings are prefabricated and its installation method |
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