CN111910500A - Anti-overturning combined bridge and construction method - Google Patents
Anti-overturning combined bridge and construction method Download PDFInfo
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- CN111910500A CN111910500A CN202010108145.9A CN202010108145A CN111910500A CN 111910500 A CN111910500 A CN 111910500A CN 202010108145 A CN202010108145 A CN 202010108145A CN 111910500 A CN111910500 A CN 111910500A
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- 238000010276 construction Methods 0.000 title claims abstract description 10
- 239000004567 concrete Substances 0.000 claims abstract description 109
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 84
- 239000010959 steel Substances 0.000 claims abstract description 84
- 239000002131 composite material Substances 0.000 claims abstract description 22
- 238000005553 drilling Methods 0.000 claims description 4
- 239000013585 weight reducing agent Substances 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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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
- E01D1/00—Bridges in general
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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
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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
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
-
- 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 the technical field of composite bridges, in particular to an anti-overturning composite bridge, which is a concrete capping beam; the plurality of open steel box girders are arranged above the concrete capping beams at preset intervals along the extension direction of the concrete capping beams, and post-cast concrete for weight reduction is poured in the open steel box girders; one end of the connecting piece penetrates through the opening steel box girder and the post-cast concrete, and the other end of the connecting piece is embedded in the cover girder and used for connecting the box girder and the cover girder, and the connecting piece and the post-cast concrete jointly form a connecting structure for preventing the opening steel box girder from turning on one side. The invention provides an anti-overturning combined bridge which is firm in connection and can effectively prevent the bridge from overturning. Meanwhile, a construction method of the overturn-preventing combined bridge is also provided.
Description
Technical Field
The invention relates to the technical field of composite bridges, in particular to an anti-overturning composite bridge and a construction method.
Background
The bridge generally refers to a structure which is erected on rivers, lakes and seas and enables vehicles, pedestrians and the like to smoothly pass through. In order to adapt to the modern high-speed developed traffic industry, bridges are also extended to be constructed to span mountain stream, unfavorable geology or meet other traffic needs, so that the buildings are convenient to pass.
The combined structure bridge uses a beam type bridge span as a basic structure, and the concrete laminated slab and the steel box girder work together through connecting pieces such as studs. The combined beam bridge can greatly reduce the structural secondary internal force and the concrete tensile stress caused by the concrete shrinkage creep effect; by adopting the mode of pre-guiding prestress into the precast concrete plate, the preparation of larger compressive stress can be established in the concrete plate in the hogging moment area, and the cracking resistance of the concrete in the hogging moment area is greatly improved.
However, in the existing combined bridge, the connection between the open steel box girder and the concrete cap girder is weaker, and when the eccentric load on the bridge deck is larger, such as under a larger unbalanced load vehicle or an earthquake, a serious accident of lateral overturn of the bridge can occur.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide an anti-overturning composite beam which is firm in connection and can effectively prevent the bridge from overturning and a construction method aiming at the defect that the bridge is overturned due to the fact that the composite beam support in the prior art is not firm in connection.
In order to solve the above technical problem, the present invention provides an anti-overturning composite bridge, comprising:
a concrete capping beam;
the plurality of open steel box girders are arranged above the concrete capping beams at preset intervals along the extension direction of the concrete capping beams, and post-cast concrete for weight reduction is poured in the open steel box girders;
one end of the connecting piece penetrates through the opening steel box girder and the post-cast concrete, and the other end of the connecting piece is embedded in the cover girder and used for connecting the box girder and the cover girder, and the connecting piece and the post-cast concrete jointly form a connecting structure for preventing the opening steel box girder from turning on one side.
Further, the arrangement direction of the box girder is perpendicular to the extension direction of the cover girder.
Further, the thickness of the post-cast concrete is 30-50 cm.
Further, still include:
the through hole penetrates through the bottom of the open steel box girder, and the diameter of the through hole is larger than that of the connecting piece.
Further, the connecting piece comprises fixing pieces arranged at two ends of the connecting piece.
Further, the open steel box girder further comprises:
the body is U-shaped and is provided with a lower flange parallel to the concrete cap beam and a web fixedly connected with the lower flange, and the post-cast concrete is poured on the lower flange;
and the two supports are symmetrically arranged below the body and are respectively fixedly connected with the body and the concrete cover beam.
And the laminated slab is fixed on the open steel box girder through the studs.
And the bridge further comprises a plurality of piers which are arranged at the bottom of the concrete capping beam and used for supporting the concrete capping beam.
The invention also provides a construction method of the overturn-preventing combined bridge, which comprises the following steps:
drilling a through hole in the bottom of the open steel box girder, inserting a connecting piece pre-embedded into the concrete cover beam into the through hole along the vertical direction, post-pouring concrete to the bottom of the open steel box girder, and forming a connecting structure for preventing the open steel box girder from side turning together by the connecting piece and the post-pouring concrete.
The technical scheme of the invention has the following advantages:
1. the invention provides an anti-overturning combined bridge, which comprises a concrete capping beam;
the plurality of open steel box girders are arranged above the concrete capping beams at preset intervals along the extension direction of the concrete capping beams, and post-cast concrete for weight reduction is poured in the open steel box girders; one end of the connecting piece penetrates through the opening steel box girder and the post-cast concrete, and the other end of the connecting piece is embedded in the cover girder and used for connecting the box girder and the cover girder, and the connecting piece and the post-cast concrete jointly form a connecting structure for preventing the opening steel box girder from turning on one side. One end of the connecting piece is directly embedded in the concrete cover beam, so that the connecting stability of the connecting piece and the concrete cover beam is improved; the other end of the connecting piece penetrates through the bottom of the open steel box girder, so that the concrete cover girder and the open steel box girder are firmly connected and form an integrated piece. The post-cast concrete poured inside the open steel box girder can effectively fix the connecting piece at the bottom of the open steel box girder, and meanwhile, the post-cast concrete can bear the compressive stress generated by the negative bending moment at the bottom of the composite girder under the action of loads of vehicles and the like, so that the condition that the lower flange of the open steel box girder is unstable under pressure is effectively avoided; meanwhile, as the open steel box girder is made of lighter materials, the later poured concrete can play a role in weight, so that the open steel box girder is effectively prevented from overturning and turning over; meanwhile, the anti-pulling capacity of the open steel box girder is effectively improved under the action of the connecting structure.
2. The anti-overturning combined bridge further comprises a through hole which penetrates through the bottom of the open steel box girder, and the diameter of the through hole is larger than that of the connecting piece. When the open steel box girder is hoisted, the connecting piece can be conveniently inserted into the through hole at the bottom of the open steel box girder and can be quickly aligned with the connecting piece, so that the open steel box girder is installed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of an anti-overturning composite bridge according to the present invention;
FIG. 2 is a schematic view of a structure before post-cast concrete;
FIG. 3 is a schematic structural view of the connection between an open steel box girder and a concrete composite slab;
description of reference numerals:
1-opening steel box girder; 2-body; 3-a lower flange; 4-a web; 5-support; 6-concrete capping beam; 7-bridge pier; 8-post-pouring concrete; 9-a through hole; 10-concrete laminated slab; 11-a stud; 12-a connector; 13-a first fixture; 14-a second fixture;
Detailed Description
The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings; obviously; the described embodiments are a part of the present invention; rather than all embodiments. Based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
Furthermore; the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 3, the anti-overturning composite bridge provided by the embodiment of the invention comprises a plurality of open steel box girders 1, concrete capping girders 6, piers 7, post-cast concrete 8 and connecting pieces 12.
A concrete cap beam 6;
the open steel box girders 1 are arranged above the concrete capping beams 6 at preset intervals along the extension direction of the concrete capping beams 6, and post-cast concrete 8 for weight is poured in the open steel box girders 1;
connecting piece 12, one end is run through opening steel box girder 1 with after-cast concrete 8, the other end pre-buried extremely in the bent cap 6, be used for connecting box girder 1 with bent cap 6, connecting piece 12 with after-cast concrete 8 constitutes jointly and is used for preventing the connection structure that opening steel box girder 1 turned on one's side.
The bottom of the concrete capping beam 6 is respectively provided with a plurality of piers 7, and in the embodiment, the number of the concrete capping beams 6 is two; the open steel box girder 1 is made of steel and is directly arranged on the concrete bent cap 6 on the construction site. When the open steel box girder 1 is manufactured, one end of the connecting piece 12 is directly embedded in the concrete bent cap 6, so that the connection stability of the connecting piece 12 and the concrete bent cap 6 is improved; the other end of the connecting piece 12 penetrates through the bottom of the open steel box girder 1, and the concrete cover beam 6 and the open steel box girder 1 are connected into a whole through a fixing piece. In the embodiment, the connecting piece 12 can be effectively fixed at the bottom of the open steel box girder by pouring the concrete, and meanwhile, the post-cast concrete can bear the compressive stress generated by the negative bending moment at the bottom of the combination girder under the action of loads such as vehicles and the like, so that the condition that the lower flange of the open steel box girder is unstable under pressure is effectively avoided; meanwhile, as the material of the open steel box girder 1 is lighter, the post-cast concrete 8 can also increase the weight of the open steel box girder 1, so that the compressive stress of the open steel box girder 1 is equal to the sum of the compressive stresses of the open steel box girder 1 and the concrete, the compressive stress of the open steel box girder 1 is increased, and the open steel box girder 1 is prevented from overturning and turning over; meanwhile, the anti-pulling capacity of the open steel box girder 1 can be effectively improved under the action of the connecting structure of the open steel box girder 1. In this embodiment, the connecting member 12 is a steel anchor rod, and the number of the connecting members 12 is not limited, and is determined according to actual needs.
As an alternative, the connecting element 12 may also be of the hook type, with one end of the hook head pre-embedded in the concrete cap 6.
As an alternative embodiment, the connecting element 12 can also be arranged directly in a recess provided in the concrete cap 6, as shown in fig. 2-3, after which the connecting element 12 is connected to the concrete cap 6 in one piece by the post-cast concrete 8.
In this embodiment, the direction of the open steel box girder 1 is perpendicular to the extending direction of the concrete cap beam 6.
In the embodiment, the casting thickness of the concrete is 30-50cm, so that the sufficient compressive strength is ensured; the bearing effect can be effectively achieved under the action of the negative bending moment, and the instability of the steel beam is prevented. Meanwhile, the anti-overturning capacity of the composite beam is enhanced through the weight.
Still including running through in the through-hole 9 that the bottom of opening steel box girder 1 set up, the bottom of connecting piece 12 is directly pre-buried in concrete bent cap 6, and the top of connecting piece 12 stretches into to the through-hole 9 in, is connected with the steel stock through the mounting to fix opening steel box girder 1 on concrete bent cap 6. The number of the through holes 9 is not limited, and needs to correspond to the number of the connecting pieces 12, and the specific number and the aperture are determined according to actual needs. Wherein the diameter of the through hole 9 is larger than the diameter of the connecting piece 12. So that the connecting member 12 can be quickly aligned when the open steel box girder 1 is hoisted, thereby installing the open steel box girder 1 on the concrete cap girder 6. The fixing piece comprises a first fixing piece 13 arranged at the top end of the connecting piece 12 and a second fixing piece 14 arranged at the bottom end of the connecting piece 12, the first fixing piece 13 and the second fixing piece 14 are nuts matched with the connecting piece 12, and the number of the connecting pieces 12 is determined according to actual needs. The diameter of the first fixing piece 13 is larger than that of the through hole 9, so that the first fixing piece 13 can be effectively prevented from sliding into the through hole 9 to influence the connection stability of the connecting piece 12; the second fixing member 14 and the steel anchor rod are directly embedded in the concrete cap beam 6.
A low modulus of elasticity material is also provided on the peripheral wall of the connector 12. In this embodiment, the low elastic modulus material is EVA foam. The EVA foam effectively prevents concrete from cracking caused by the conditions of shrinkage, creep, temperature effect and the like of the concrete.
The shrinkage is a phenomenon in which the volume of concrete decreases when the concrete hardens in air.
Creep refers to the phenomenon that the strain of concrete increases with time under the long-term action of a certain constant load.
As shown in fig. 2-3, in this embodiment, the open steel box girder 1 further includes a U-shaped body 2 and a support 5, the body 2 has a lower flange 3 parallel to the concrete cap beam 6 and two webs 4 fixedly connected to the lower flange 3, and the post-cast concrete 8 is poured on the lower flange 3;
and the two supports 5 are symmetrically arranged below the body 2 and are respectively and fixedly connected with the body 2 and the concrete bent cap 6. The open steel box girder 1 is set to be U-shaped, and concrete can be effectively poured on the lower flange 3.
The two side plates are in an I shape, the number of the studs 11 on the top of the web 4 is set according to actual needs, and the concrete composite slab 10 is fixed on the open steel box girder 1 through the studs 11.
The invention also provides a construction method of the overturn-preventing combined bridge, which comprises the following steps: drilling a through hole 9 in the bottom of the open steel box girder 1, inserting a connecting piece 12 pre-embedded into the concrete cover girder 6 into the through hole 9 along the vertical direction, pouring post-cast concrete 8 at the bottom of the through hole 9 and the open steel box girder 1, wherein the connecting piece 12 and the post-cast concrete 8 jointly form a connecting structure for preventing the open steel box girder 1 from turning on one side.
The specific construction process comprises the following steps: the method comprises the steps of arranging a concrete cover beam 6 on the top of a pier 7, pre-burying a connecting piece 12 on the concrete cover beam 6, drilling a through hole 9 in the bottom of an open steel box beam 1, hoisting the open steel box beam 1 and fixing the open steel box beam on the concrete cover beam 6, enabling the connecting piece 12 to penetrate through the through hole 9, pouring concrete into the through hole 9, continuing to pour the concrete at the bottom of the open steel box beam 1 after the through hole 9 is filled with the concrete until the thickness of the poured concrete reaches more than 30cm, and installing a first fixing piece on the top of the connecting piece 12, so that the open steel box beam 1 is fixedly connected with the concrete cover beam 6.
Obviously; the above embodiments are merely examples provided for clarity of illustration; and not as restrictive. To one of ordinary skill in the art; other variations and modifications may be made on the basis of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. An anti-overturning composite bridge, comprising:
a concrete capping beam (6);
the open steel box girders (1) are arranged above the concrete capping beams (6) at preset intervals along the extension direction of the concrete capping beams (6), and post-cast concrete (8) for weight is poured in the open steel box girders (1);
connecting piece (12), one end run through opening steel case roof beam (1) with after pour concrete (8), the other end is pre-buried extremely in bent cap (6), be used for connecting case roof beam (1) with bent cap (6), connecting piece (12) with after pour concrete (8) and constitute jointly and be used for preventing the connection structure that opening steel case roof beam (1) turned on one's side.
2. -overturn-preventing composite bridge according to claim 1, characterized in that the box girder (1) is arranged in a direction perpendicular to the extension direction of the cover girder (6).
3. The overturn-preventing composite bridge according to claim 1 or 2, characterized in that the thickness of the post-cast concrete (8) is 30-50 cm.
4. The overturn-preventing composite bridge of any one of claims 1 to 3, further comprising:
the through hole (9) penetrates through the bottom of the open steel box girder (1), and the diameter of the through hole (9) is larger than that of the connecting piece (12).
5. The overturn-preventing composite bridge of any one of claims 1 to 4, further comprising fixing members provided at both ends of the connecting member (12).
6. The overturn-preventing composite bridge beam of claim 5, wherein the open steel box girder (1) further comprises:
the body (2) is U-shaped and is provided with a lower flange (3) parallel to the concrete bent cap (6) and a web (4) fixedly connected with the lower flange (3), and the post-cast concrete (8) is poured on the lower flange (3);
the two supports (5) are symmetrically arranged below the body (2) and are respectively and fixedly connected with the body (2) and the concrete cover beam (6).
7. The overturn-preventing composite bridge girder according to claim 6, further comprising a stud (11) provided on the top of the web (4), and the concrete composite slab (10) is fixed on the open steel box girder (1) by the stud (11).
8. The overturn-preventing composite bridge according to any one of claims 1 to 7, further comprising a plurality of piers (7) provided at the bottom of the concrete cap beam (6) for supporting the concrete cap beam (6).
9. The construction method of the overturn-preventing combined bridge is characterized by comprising the following steps of:
drilling a through hole (9) on the bottom of the opening steel box girder (1), inserting a connecting piece (12) pre-buried in the concrete cover beam (6) into the through hole (9) along the vertical direction, and post-pouring concrete (8) to the bottom of the opening steel box girder (1), wherein the connecting piece (12) and the post-pouring concrete (8) jointly form a connecting structure for preventing the opening steel box girder (1) from side turning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010108145.9A CN111910500A (en) | 2020-02-21 | 2020-02-21 | Anti-overturning combined bridge and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010108145.9A CN111910500A (en) | 2020-02-21 | 2020-02-21 | Anti-overturning combined bridge and construction method |
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| CN111910500A true CN111910500A (en) | 2020-11-10 |
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| CN202010108145.9A Pending CN111910500A (en) | 2020-02-21 | 2020-02-21 | Anti-overturning combined bridge and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112746554A (en) * | 2021-02-08 | 2021-05-04 | 清华大学 | Combined capping beam and bridge with same |
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| CN112746554A (en) * | 2021-02-08 | 2021-05-04 | 清华大学 | Combined capping beam and bridge with same |
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