CN113279323A - Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method - Google Patents

Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method Download PDF

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Publication number
CN113279323A
CN113279323A CN202110701492.7A CN202110701492A CN113279323A CN 113279323 A CN113279323 A CN 113279323A CN 202110701492 A CN202110701492 A CN 202110701492A CN 113279323 A CN113279323 A CN 113279323A
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China
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thin
steel box
open steel
capping beam
reinforced concrete
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Inventor
姚晓飞
霍龙飞
来猛刚
李刚
姚文奇
李超
刘浩
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CCCC First Highway Consultants Co Ltd
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CCCC First Highway Consultants Co Ltd
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Priority to CN202110701492.7A priority Critical patent/CN113279323A/en
Publication of CN113279323A publication Critical patent/CN113279323A/en
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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
    • E01D19/00—Structural or constructional details of bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D1/00—Bridges in general
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/20—Concrete, stone or stone-like material
    • E01D2101/24—Concrete
    • E01D2101/26—Concrete reinforced
    • E01D2101/28—Concrete reinforced prestressed
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00—Material constitution of bridges
    • E01D2101/30—Metal

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The invention relates to a thin-wall opening steel box-prestressed reinforced concrete combined capping beam and a construction method thereof, wherein the combined capping beam comprises a thin-wall opening steel box and a pier stud; an internal reinforcement cage is arranged in the thin-wall open steel box, and concrete is poured; the pier top is provided with the pre-buried wedge-shaped steel piece in pier top, and the position welded fastening that thin wall opening steel box bottom corresponds the pier stud has the reinforcing steel plate at the bottom of the bent cap, and the pre-buried wedge-shaped steel piece welded fastening in pier top realizes being connected of pier stud and thin wall opening steel box on the reinforcing steel plate at the bottom of the bent cap. The steel box has the characteristics of high strength, light weight, easy splicing and the like, can form a steel-concrete structure with internal prestressed reinforced concrete, can serve as a template for internal post-cast concrete, saves the amount of labor for supporting and dismantling the template, accelerates the construction progress, reduces the influence on the passing under a bridge, and provides a always effective and reasonable solution for the difficult problems of green, assembly and rapid construction of the existing long and large capping beam.

Description

Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a thin-wall open steel box-prestressed reinforced concrete combined capping beam and a construction method.
Background
At present, cast-in-place construction is mainly used for oversized bent caps. A large number of supports and templates need to be erected in the cast-in-place construction, and the passing under a bridge is seriously hindered; and a plurality of construction equipment are all in the construction site, cause serious dust and noise pollution, bring a lot of inconvenience for the production and the life of residents around the construction site, restrict the development of green cities, and hinder social progress.
The assembly construction is widely applied to bridge superstructure and tends to mature, and the construction of six-lane high speed, urban high frame and the like becomes a common demand with the increase of traffic flow. The long capping beam is the key point of road traffic in the future, and the scale and the market are huge. The prefabrication and assembly technology of bridge superstructure and bridge pier has become mature and widely applied, and the construction of the bent cap becomes a key factor influencing the passing space under the bridge, restricting the construction period and the full assembly of the bridge. Aiming at the bent cap structure with the length of more than 30m, the existing full-prefabricated or semi-prefabricated construction mode can not effectively solve the industrialization problem of the long and large bent cap. Therefore, a new construction method and a new capping beam structure are needed.
Disclosure of Invention
The invention aims to provide a thin-wall open steel box-prestressed reinforced concrete combined capping beam and a construction method thereof, which solve the problems of heavy hoisting weight and difficult transportation and hoisting of a prefabricated capping beam monomer, reduce the construction risk, accelerate the construction efficiency and ensure the under-bridge traffic.
The technical scheme adopted by the invention is as follows:
thin wall opening steel case-prestressed reinforced concrete combination bent cap, its characterized in that:
the combined capping beam comprises a thin-wall opening steel box and a pier stud;
an internal reinforcement cage is arranged in the thin-wall open steel box, and concrete is poured;
the pier top is provided with the pre-buried wedge-shaped steel piece in pier top, and the position welded fastening that thin wall opening steel box bottom corresponds the pier stud has the reinforcing steel plate at the bottom of the bent cap, and the pre-buried wedge-shaped steel piece welded fastening in pier top realizes being connected of pier stud and thin wall opening steel box on the reinforcing steel plate at the bottom of the bent cap.
The thin-wall opening steel box is a hollow steel box without a top cover and comprises a bottom plate and side plates.
The side plates and the bottom plate of the thin-wall open steel box are welded and fixed with stiffening plates which are vertical to each other and vertical to the side plates and the bottom plate, the stiffening plates which are vertically arranged form a U-shaped transverse stiffening rib, and the stiffening plates which are horizontally arranged form a longitudinal stiffening rib in an annular mode.
Shear welding nails which are respectively vertical to the side plate and the bottom plate are welded and fixed on the side plate and the bottom plate of the thin-wall open steel box.
And prestressed steel bars are arranged in the thin-wall open steel box.
The side plates at two ends of the thin-wall opening steel box are end plates, the end plates are provided with prestressed holes and anchor backing plates, and two ends of prestressed steel bars in the thin-wall opening steel box penetrate through the prestressed holes and are anchored on the anchor backing plates.
The top opening of the thin-wall opening steel box is sealed by a welding cover plate.
Be provided with pier stud top pre-buried anchor reinforcing bar in the pier stud top, pier top pre-buried wedge steel block bottom welds to on the pier stud top pre-buried anchor reinforcing bar.
The construction method of the thin-wall opening steel box-prestressed reinforced concrete combined capping beam is characterized by comprising the following steps of:
the method comprises the following steps:
the method comprises the following steps: manufacturing a thin-wall open steel box in a precast yard, welding a stiffening plate and a shear welding nail inside the box, reinforcing a steel plate at the bottom of a cover beam at the bottom of a welder, and binding an internal reinforcement cage;
step two: the thin-wall open steel box and the internal reinforcement cage are transported to the site and hoisted and positioned, and the thin-wall open steel box is welded to a pier top embedded wedge-shaped steel block at the top of the pier column through a cover beam bottom reinforcing steel plate to realize consolidation;
step three: arranging prestressed steel bars in the thin-wall open steel box, hoisting an internal steel reinforcement cage into the thin-wall open steel box, and welding a cover plate at the top open end of the thin-wall open steel box;
step four: and pouring concrete in the bent cap, and stretching the bent cap to realize prestress after the concrete reaches the strength, thereby finishing the construction of the bent cap.
And pouring the internal post-cast concrete in two layers, pouring a second layer of post-cast section when the strength of the first layer of poured concrete reaches more than 90%, and post-tensioning the prestressed reinforcement after the designed strength of the concrete is achieved.
The invention has the following advantages:
the outer-layer thin-wall open steel box has the characteristics of high strength, light weight, easiness in splicing and the like, can form a reinforced concrete structure with internal prestressed reinforced concrete, participates in integral stress of the structure, and optimizes section design; the concrete post-pouring formwork can serve as a formwork for post-pouring concrete inside, so that the amount of formwork supporting and dismantling is saved, the construction progress is accelerated, and the influence on the under-bridge traffic is reduced; meanwhile, the method has the advantages of low requirement on transportation and hoisting equipment, template saving, good durability and the like, and provides a always effective and reasonable solution for the problems of green, assembled and rapid construction of the existing long and large bent cap.
Drawings
Fig. 1 is an elevation view of a composite capping beam.
Fig. 2 is a sectional view of the combined bent cap a-a.
Fig. 3 is a sectional view of the combined bent cap B-B.
Fig. 4 is an elevation view of a thin walled open steel tank.
FIG. 5 is a plan view of a thin walled open steel tank.
FIG. 6 is a cross-sectional view of a thin-walled open steel tank.
Fig. 7 is a shear stud layout.
Fig. 8 is an internal reinforcement cage construction (I-I).
Fig. 9 is a cross-sectional view of an inner reinforcement cage.
Fig. 10 is a plan view of an inner reinforcement cage.
Fig. 11 is an elevation view of the pier stud and cap beam connection.
Fig. 12 is a plan view of the pier stud.
In the figure: 1-thin wall open steel box; 2, post-pouring concrete inside; 3-pier stud; 4-prestressed reinforcement; 5, an internal reinforcement cage; 6, shearing force welding nails; 7-longitudinal stiffeners; 8-transverse stiffeners; 9-anchor backing plate; 10, embedding a wedge-shaped steel block at the pier top; 11, embedding anchoring steel bars at the tops of the pier studs; 12-reinforcing steel plate at the bottom of the cover beam; 13-cover plate; 14-combined capping beam.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention relates to a thin-wall open steel box-prestressed reinforced concrete combined capping beam, wherein the combined capping beam 14 comprises a thin-wall open steel box 1 and at least one pier stud 3; an internal reinforcement cage 5 is arranged in the thin-wall open steel box 1, and concrete is poured; the top of the pier stud 3 is provided with a pier top embedded wedge-shaped steel block 10, the bottom of the thin-wall open steel box 1 corresponding to the position of the pier stud 3 is welded and fixed with a capping beam bottom reinforced steel plate 12, and the pier top embedded wedge-shaped steel block 10 is welded and fixed on the capping beam bottom reinforced steel plate 12, so that the connection between the pier stud 3 and the thin-wall open steel box 1 is realized.
The thin-wall opening steel box 1 is a hollow steel box without a top cover and comprises a bottom plate and side plates. The side plates and the bottom plate of the thin-wall open steel box 1 are welded and fixed with stiffening plates which are vertical to each other and vertical to the side plates and the bottom plate, the vertically arranged stiffening plates form a U-shaped transverse stiffening rib 8, and the horizontally arranged stiffening plates form a longitudinal stiffening rib 7 in an annular mode. The shear welding nails 6 which are respectively vertical to the side plate and the bottom plate are welded and fixed on the side plate and the bottom plate of the thin-wall opening steel box 1, the shear welding nails 6 are arranged in a quincunx shape, and the position can be properly moved if other components conflict.
The thin-wall opening steel box 1 is internally provided with prestressed steel bars 4. The side plates at the two ends of the thin-wall open steel box 1 are end plates, the end plates are provided with prestressed holes and anchor backing plates 9, and the two ends of the prestressed reinforcement 4 in the thin-wall open steel box 1 penetrate through the prestressed holes and are anchored on the anchor backing plates 9.
After the internal reinforcement cage 5 is installed, the top opening of the thin-wall opening steel box 1 is sealed by the welding cover plate 13.
Be provided with pier stud top pre-buried anchor reinforcing bar 11 in the pier stud 3 top, pier top pre-buried wedge-shaped steel block 10 bottom welds on pier stud top pre-buried anchor reinforcing bar 11.
The construction method of the thin-wall open steel box-prestressed reinforced concrete combined capping beam comprises the following steps:
the method comprises the following steps: manufacturing a thin-wall open steel box 1 in a precast yard, welding a stiffening plate and a shear welding nail 6 inside the box, welding a bent cap bottom reinforcing steel plate 12 at the bottom of a welder, and binding an internal reinforcement cage 5;
when the steel box is processed, factory processing drawings are converted for design drawings, thin-wall opening steel box components are subjected to blanking, cutting, edge planing, welding and correcting in a factory, whether segmental or integral prefabrication is carried out in the factory or not is determined according to construction capacity, and anti-corrosion treatment is carried out on the inner cavity and the outer side of the steel box. And the reinforcement cage is manufactured in a prefabricated field.
Step two: the thin-wall open steel box 1 and the internal reinforcement cage 5 are transported to the site and hoisted and positioned, and the thin-wall open steel box 1 is welded to the pier top embedded wedge-shaped steel block 10 at the top of the pier stud 3 through the bent cap bottom reinforced steel plate 12 to realize consolidation. And carrying out rust removal treatment on the outer leakage steel plate at the top of the pier stud and the steel box bottom plate. The thin-wall open steel box can be hoisted by adopting hoisting tools such as truck cranes or bridge erecting machines according to the hoisting weight, and the hoisting tools are stable and slow, and are strictly prohibited from colliding.
Step three: arranging prestressed reinforcements 4 in the thin-wall open steel box 1, hoisting an inner reinforcement cage 5 into the thin-wall open steel box 1, and welding a cover plate 13 at the top open end of the thin-wall open steel box 1;
step four: and pouring concrete in the bent cap, and stretching the bent cap to realize prestress after the concrete reaches the strength, thereby finishing the construction of the bent cap.
And pouring the internal post-cast concrete in two layers, pouring a second layer of post-cast section when the strength of the first layer of poured concrete reaches more than 90%, and post-tensioning the prestressed reinforcement 4 after the designed strength of the concrete is achieved.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.

Claims (10)

1. Thin wall opening steel case-prestressed reinforced concrete combination bent cap, its characterized in that:
the combined capping beam (14) comprises a thin-wall open steel box (1) and a pier stud (3);
an internal reinforcement cage (5) is arranged in the thin-wall open steel box (1) and concrete is poured;
pier top pre-buried wedge-shaped steel block (10) is provided with pier top, and the position welded fastening that thin wall opening steel case (1) bottom corresponds pier column (3) has reinforcing steel plate (12) at the bottom of the bent cap, and pier top pre-buried wedge-shaped steel block (10) welded fastening realizes being connected of pier column (3) and thin wall opening steel case (1) on reinforcing steel plate (12) at the bottom of the bent cap.
2. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 1, wherein:
the thin-wall opening steel box (1) is a hollow steel box without a top cover and comprises a bottom plate and side plates.
3. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 2, wherein:
stiffening plates which are perpendicular to each other and perpendicular to the side plates and the bottom plate are welded and fixed on the side plates and the bottom plate of the thin-wall open steel box (1), the stiffening plates which are vertically arranged form a U-shaped transverse stiffening rib (8), and the stiffening plates which are horizontally arranged form a longitudinal stiffening rib (7) in an annular mode.
4. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 3, wherein:
shear welding nails (6) which are respectively vertical to the side plate and the bottom plate are welded and fixed on the side plate and the bottom plate of the thin-wall open steel box (1).
5. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 4, wherein:
and prestressed steel bars (4) are arranged in the thin-wall open steel box (1).
6. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 5, wherein:
the side plates at the two ends of the thin-wall open steel box (1) are end plates, the end plates are provided with prestressed holes and anchor backing plates (9), and the two ends of the prestressed reinforcement (4) in the thin-wall open steel box (1) penetrate through the prestressed holes and are anchored on the anchor backing plates (9).
7. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 6, wherein:
the top opening of the thin-wall opening steel box (1) is closed by a welding cover plate (13).
8. The thin-walled open steel box-prestressed reinforced concrete composite capping beam as claimed in claim 7, wherein:
be provided with pier stud top pre-buried anchor reinforcing bar (11) in pier stud (3) top, pier top pre-buried wedge steel block (10) bottom welds on pier stud top pre-buried anchor reinforcing bar (11).
9. The construction method of the thin-wall open steel box-prestressed reinforced concrete combined capping beam as claimed in claim 8, characterized in that:
the method comprises the following steps:
the method comprises the following steps: manufacturing a thin-wall open steel box (1) in a precast yard, welding a stiffening plate and a shear welding nail (6) inside the box, welding a bent cap bottom reinforcing steel plate (12) at the bottom of a welding device, and binding an internal reinforcement cage (5);
step two: the thin-wall open steel box (1) and the internal reinforcement cage (5) are transported to the site and hoisted and positioned, the thin-wall open steel box (1) is welded to a pier top embedded wedge-shaped steel block (10) at the top of the pier stud (3) through a cover beam bottom reinforcing steel plate (12), and consolidation is realized;
step three: arranging prestressed reinforcements (4) in the thin-wall open steel box (1), hoisting an internal reinforcement cage (5) into the thin-wall open steel box (1), and welding a cover plate (13) at the top open end of the thin-wall open steel box (1);
step four: and pouring concrete in the bent cap, and stretching the bent cap to realize prestress after the concrete reaches the strength, thereby finishing the construction of the bent cap.
10. The construction method of the thin-wall open steel box-prestressed reinforced concrete combined capping beam as claimed in claim 9, wherein:
and pouring the internal post-cast concrete in two layers, pouring a second layer of post-cast section when the strength of the first layer of poured concrete reaches more than 90%, and post-tensioning the prestressed reinforcement (4) when the designed strength of the concrete is achieved.
CN202110701492.7A 2021-06-24 2021-06-24 Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method Pending CN113279323A (en)

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CN202110701492.7A CN113279323A (en) 2021-06-24 2021-06-24 Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method

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Application Number Priority Date Filing Date Title
CN202110701492.7A CN113279323A (en) 2021-06-24 2021-06-24 Thin-wall open steel box-prestressed reinforced concrete combined capping beam and construction method

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114561865A (en) * 2022-04-14 2022-05-31 宁波市高等级公路建设管理中心 Prestressed concrete bent cap based on prefabricated prestressed UHPC shell and construction process thereof
CN114575232A (en) * 2022-04-14 2022-06-03 宁波市高等级公路建设管理中心 Large-cantilever semi-fabricated prestressed concrete bent cap and construction process thereof
CN114737481A (en) * 2022-04-07 2022-07-12 中铁电气化局集团有限公司 Construction method for door type pier steel box formwork over existing line

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114737481A (en) * 2022-04-07 2022-07-12 中铁电气化局集团有限公司 Construction method for door type pier steel box formwork over existing line
CN114561865A (en) * 2022-04-14 2022-05-31 宁波市高等级公路建设管理中心 Prestressed concrete bent cap based on prefabricated prestressed UHPC shell and construction process thereof
CN114575232A (en) * 2022-04-14 2022-06-03 宁波市高等级公路建设管理中心 Large-cantilever semi-fabricated prestressed concrete bent cap and construction process thereof

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