CN111424531A - Wet joint structure of steel-concrete combined bridge deck slab and construction method - Google Patents
Wet joint structure of steel-concrete combined bridge deck slab and construction method Download PDFInfo
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- CN111424531A CN111424531A CN202010264551.4A CN202010264551A CN111424531A CN 111424531 A CN111424531 A CN 111424531A CN 202010264551 A CN202010264551 A CN 202010264551A CN 111424531 A CN111424531 A CN 111424531A
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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
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Abstract
The invention particularly relates to a wet joint structure of a steel-concrete composite bridge panel and a construction method. The invention provides a wet joint structure of a steel-concrete composite bridge deck and a construction method, aiming at the field construction problem caused by inaccurate positioning of the reserved steel bar position of the prefabricated bridge deck in the prior art. The wet joint structure provided by the invention comprises three parts, namely bridge deck steel bars, U-shaped connecting bars and steel bar connectors, the length of the end steel bars is obviously shortened compared with that of the traditional prefabricated bridge deck, the bridge deck is placed, then the U-shaped connecting bars are connected through the steel bar connectors to form the wet joint steel bars, and the wet joint steel bars and the adjacent prefabricated slab wet joint steel bars are staggered to form a framework. In addition, when the reinforcing steel bars are embedded in the prefabricated bridge panel, the reinforcing steel bars are tensioned to form prestress on the concrete. This wet joint structure can effectively reduce the construction degree of difficulty, satisfies construction strength when practicing thrift the construction procedure, has good popularization meaning.
Description
Technical Field
The invention belongs to the technical field of bridge connection structures, and particularly relates to a wet joint structure of a steel-concrete composite bridge panel and a bridge panel construction method adopting the wet joint structure.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
With the development of bridge construction in China, the bridge industrialized prefabrication and assembly technology becomes an effective method for ensuring the construction quality in bridge construction and shortening the construction period. The rapid development of modern industry puts higher requirements on prefabrication, standardization, industrialization and industrialization of bridge construction. The application and popularization of the steel-concrete composite bridge become a high-performance bridge structure form capable of realizing the rapid assembly of the bridge, and simultaneously meet the requirements of bridge construction and development. The goal of standardization and industrialization of the steel-concrete composite bridge is to solve the reliable connection between each unit component, wherein the effective connection between the bridge deck boards is one of the key technologies. In order to fully exert the compression resistance of concrete, the upper layer of the section of the steel-concrete composite beam is a concrete bridge deck, and the lower layer is a steel main beam. The connection between concrete bridge decks usually adopts a wet joint connection mode, and after the wet joints are erected and poured, shearing force and bending moment are transmitted by using wet joint reinforcing steel bars reserved when adjacent bridge decks are prefabricated. However, in actual research, it is found that the adjacent bridge deck overhanging steel bars conflict with each other due to inaccurate positioning during prefabrication in construction; when the wet joint is wide, the overhanging reserved steel bar is too long, so that the construction and transportation of a prefabricating field are inconvenient; the problems of unstable staggered lap joint of the reinforcing steel bars directly influence the cracking resistance and the durability of concrete at the wet joint part.
To the technical problem that above-mentioned exists, patent CN110004822A provides a wet joint connection design of precast concrete beam, and the tip reinforcing bar of its precast concrete beam board accomplishes the semiannulus, and the semiannulus reinforcing bar of two adjacent precast concrete beam boards is crisscross at wet seam department and is formed the hoop reinforcement, arranges the longitudinal reinforcement in the hoop reinforcement. The inventor thinks that this scheme can effectively reduce the construction degree of difficulty, but prefabricated semicircular end reinforcing bar still can have the improper problem in reserved reinforcing bar size or position when the equipment to it is still great with the tying up the degree of difficulty to arrange the welding of longitudinal reinforcement in the hoop stirrup.
Disclosure of Invention
The prefabricated slab wet joint reinforcing steel bar positioning device aims at the problems of inaccurate positioning, inconvenience in construction, difficulty in transportation and the like of prefabricated slab wet joint reinforcing steel bars recorded in the background technology. The invention improves the end reinforcing steel bars and the embedded reinforcing steel bars of the prefabricated bridge deck reinforcing steel bars, and the U-shaped end connecting steel bars are connected through the reinforcing steel bar connectors, so that the preparation process is further obviously simplified; in addition, prestress is applied to the bridge deck slab by tensioning the prefabricated steel bars, so that the crack resistance of concrete is effectively improved, and the durability is improved.
Aiming at the technical effects, the invention provides the following technical scheme:
the invention provides a wet joint structure of a steel-concrete composite bridge deck, which consists of prefabricated bridge deck steel bars, U-shaped connecting bars and steel bar connectors; u type splice bar is one section U-shaped reinforcing bar, steel bar connector is one section steel bar sleeve for cup joint prefabricated decking reinforcing bar and U-shaped splice bar, make bridge deck slab tip stretch out U type reinforcing bar to adjacent bridge panel, the U type reinforcing bar crisscross each other of adjacent bridge panel forms the hoop overlap joint.
Research on the lap joint of the annular reinforcing steel bars in the field shows that the mechanism of lap joint force transfer of the annular reinforcing steel bars is completely different from that of the lap joint force transfer of the common reinforcing steel bars. The main points are as follows: the annular steel bar lapping force transmission is the force transmission of a core concrete column in an interlocking ring formed by two U-shaped lapping steel bars, the tension of the steel bars on the two sides of the core concrete column is self-balanced, the problem of steel bar anchoring does not exist, and the possible failure mode only has two types of core concrete shearing failure and U-shaped steel bar breaking.
Aiming at the two destructive effects existing in the U-shaped steel bar lap joint mode, the invention also provides a technical scheme for arranging the longitudinal steel bar in the U-shaped steel bar, which is used for enhancing the bearing strength of the core concrete. In addition, the bridge steel bar and the U-shaped steel bar are connected through the steel bar sleeve, and the connection strength of the steel bar sleeve is higher than that of the steel bar, so that the tensile strength of the U-shaped steel bar can be effectively enhanced, and the problem that the U-shaped steel bar is easy to break in the lap joint of the annular steel bar is solved. The defect of inaccurate positioning of the steel bars during prefabricating the bridge deck slab can be overcome by increasing the length of the steel bar connecting sleeve and adjusting the connecting position of the steel bar connector. The connecting mode of the steel bar sleeve reduces the preparation requirement of the prefabricated panel, the field construction is more flexible and convenient, although the connecting mode is a common connecting method, the connecting mode is applied to the joint structure, the technical defect of a U-shaped lap joint mode can be just made up, the construction difficulty is reduced, and the connecting mode has a good technical effect.
In addition, when the prefabricated bridge panel is used for preparing a steel-concrete bridge panel, the pre-embedded bridge reinforcing steel bars are tensioned by adopting a pre-tensioning method, so that the floating of the reinforcing steel bars during concrete pouring can be effectively avoided, the use of concrete cushion blocks is reduced, and the crack resistance of bridge deck concrete can be improved.
In a second aspect of the invention, a bridge deck construction method is provided, and the construction method comprises the step of connecting prefabricated bridge decks by using the wet joint structure of the steel-concrete composite bridge deck in the first aspect.
During construction, after the reinforced concrete composite bridge panel provided by the invention is placed in advance, the U-shaped connecting ribs are connected through the steel bar connectors, the construction difficulty is obviously reduced, longitudinal steel bars do not need to be added for fixing, and the construction time can be obviously saved.
The beneficial effects of one or more of the above technical solutions are as follows:
1) the overhanging length of the reinforcing steel bar of the bridge deck is shortened, the storage space is saved, and meanwhile, the prefabrication, the storage, the transportation and the hoisting installation are facilitated;
2) the U-shaped steel bars are convenient to manufacture and simple to operate, the different U-shaped steel bars are arranged in a staggered mode after installation, the performance of transferring shearing force and bending moment is good, and the stress on the structure is good;
3) the positioning is accurate, the steel bars of the precast slabs are tensioned during the prefabrication, the floating displacement of the steel bars during the concrete pouring is avoided, and the thickness of a steel bar protective layer can be ensured to meet the national standard requirement without using a cushion block;
4) the tensioned steel bars are equivalent to applying prestress to the bridge deck slab, so that the crack resistance of concrete is enhanced, and the durability of the bridge deck slab concrete is improved;
5) only the steel bar connector is needed to be used for screwing the U-shaped connecting bar and the bridge deck steel bar on site, the operation is simple and convenient, and the requirement on the technical level of workers is not high.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a plan view of a wet joint structure of a steel-concrete composite bridge deck according to example 1;
FIG. 2 is a vertical layout view of the wet joint structure of the steel-concrete composite bridge deck in example 1;
FIG. 3 is a schematic view of the reinforcement of the prefabricated bridge deck according to embodiment 1;
FIG. 4 is a schematic view of the U-shaped connecting rib structure in example 1;
fig. 5 is a schematic structural view of the reinforcing bar coupler according to embodiment 1;
in fig. 1 to 5, 1: prefabricated bridge deck, 2: reinforcing bar connector, 3: u-shaped connecting rib, 4: wet seam, 5: and (5) prefabricating the reinforcing steel bars of the bridge deck.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, the invention provides a wet joint structure of a steel-concrete composite bridge deck and a construction method thereof aiming at the defects in the prior art.
The invention provides a wet joint structure of a steel-concrete composite bridge deck, which consists of prefabricated bridge deck steel bars, U-shaped connecting bars and steel bar connectors; u type splice bar is one section U-shaped reinforcing bar, steel bar connector is one section steel bar sleeve for connect prefabricated decking reinforcing bar and U-shaped splice bar, make bridge deck plate tip stretch out U type reinforcing bar to adjacent bridge deck plate, the U type reinforcing bar crisscross each other of adjacent bridge deck plate forms the hoop overlap joint.
Preferably, the inner side of the U-shaped steel bar is provided with a longitudinally arranged steel bar.
Further preferably, the longitudinal reinforcing bars are vertical to and penetrate through all the U-shaped connecting bars at the end parts of the bridge deck.
Further preferably, the number of the longitudinal steel bars is 6-8, and the longitudinal steel bars are distributed at equal intervals.
Preferably, the prefabricated bridge deck steel bars are pre-embedded steel bars for pouring concrete after tensioning.
Preferably, prefabricated decking reinforcing bar tip has the countersunk tapping, and the reinforcing bar tip also has the countersunk tapping, the steel bar connector inner wall has the screw thread that suits with prefabricated decking reinforcing bar and U type splice bar.
Preferably, the length of the overhanging countersunk head tapping of the prefabricated bridge deck steel bar is 50-70 mm; specifically, it is 60 mm.
Preferably, the length of the countersunk tapping at the end part of the U-shaped connecting rib is 50-70 mm; specifically, it is 60 mm.
Preferably, the length of the steel bar connector is 50-60 mm; specifically, it is 55 mm.
Preferably, the reinforcing steel bar connector is made of carbon structural steel.
In a second aspect of the invention, a bridge deck construction method is provided, and the construction method comprises the step of connecting prefabricated bridge decks by using the wet joint structure of the steel-concrete composite bridge deck in the first aspect.
Preferably, the construction method comprises the following specific steps: and installing U-shaped connecting ribs after the steel-concrete composite bridge panel is placed, and then pouring wet joints.
Further preferably, the casting material is micro-expansion low-shrinkage concrete.
Preferably, the preparation method of the steel-concrete composite bridge panel comprises the following steps: placing the bridge deck steel bars on a prefabricated pedestal after countersunk tapping the two ends of the bridge deck steel bars; and placing the steel bar connector at the end part of the bridge deck steel bar, tensioning the bridge deck steel bar through tensioning equipment, pouring concrete, and demolding to obtain the reinforced concrete combined bridge deck.
Further preferably, the tensioning device is a prestressed through jack.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
In this embodiment, a wet joint structure of a steel-concrete composite bridge deck is provided, which is composed of prefabricated bridge deck steel bars 5, U-shaped connecting bars 3 and steel bar connectors 2. The wet joint structure is shown in attached figures 1 and 2, wherein the attached figure 1 is a plane layout drawing of the wet joint structure of the steel-concrete composite bridge panel, a joint is formed after the prefabricated bridge panel is placed, the U-shaped connecting ribs 3 are connected with the end parts of the prefabricated bridge panel reinforcing steel bars 5 through the reinforcing steel bar connectors 2, and U-shaped ends which are arranged in a staggered mode are formed at the joint.
The structure of the prefabricated bridge deck steel bar 5 is shown in figure 3, the end part of the prefabricated bridge deck steel bar is provided with a countersunk tapping, and the length of the prefabricated bridge deck steel bar is 60 mm.
U type splice bar 3 is a section U-shaped reinforcing bar, and two open ends have the countersunk head tapping equally, and length is 60 mm.
The steel bar connector 2 is a section of steel bar sleeve, and the inner wall of the steel bar connector is provided with threads which are matched with the prefabricated bridge deck steel bar 5 and the U-shaped connecting bar 3, is used for sleeving the prefabricated bridge deck steel bar 5 and the U-shaped connecting bar 3 and is made of No. 45 high-quality carbon structural steel.
The prefabricated bridge deck steel bars are pre-embedded steel bars for pouring concrete after tensioning.
Example 2
In the embodiment, a bridge deck construction method is provided, and the construction method includes connecting prefabricated bridge decks by using the wet joint structure of the steel-concrete composite bridge deck in the embodiment 1.
The construction method comprises the following specific steps: and after placing the adjacent steel-concrete composite bridge panels, installing U-shaped connecting ribs 3, and then pouring wet joints by adopting micro-expansion low-shrinkage concrete.
In this embodiment, a method for preparing the steel-concrete composite bridge panel in embodiment 1 is further provided as follows: placing the bridge deck steel bars on a prefabricated pedestal after countersunk tapping the two ends of the bridge deck steel bars; and placing the steel bar connector at the end part of the bridge deck steel bar, tensioning the bridge deck steel bar through tensioning equipment, pouring concrete, and demolding to obtain the reinforced concrete combined bridge deck.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A wet joint structure of a steel-concrete composite bridge deck is characterized by comprising prefabricated bridge deck steel bars, U-shaped connecting bars and steel bar connectors; u type splice bar is one section U-shaped reinforcing bar, steel bar connector is one section steel bar sleeve for connect prefabricated decking reinforcing bar and U-shaped splice bar, make bridge deck plate tip stretch out U type reinforcing bar to adjacent bridge deck plate, the U type reinforcing bar crisscross each other of adjacent bridge deck plate forms the hoop overlap joint.
2. The wet joint structure of steel-concrete composite bridge deck slab as claimed in claim 1, wherein the U-shaped steel bars are provided with longitudinally arranged steel bars at the inner side;
preferably, the longitudinal steel bars are vertical and penetrate through all U-shaped connecting bars at the end part of the bridge panel;
preferably, the number of the longitudinal steel bars is 6-8, and the longitudinal steel bars are distributed at equal intervals.
3. The wet joint structure of the steel-concrete composite bridge deck slab as claimed in claim 1, wherein the prefabricated bridge deck slab reinforcing steel bars are pre-embedded reinforcing steel bars of cast-in-place concrete after tensioning.
4. The wet joint construction of steel and concrete composite bridge deck slab of claim 1, wherein said prefabricated bridge deck slab reinforcement ends have counter-sunk tapping, said reinforcement ends also have counter-sunk tapping, and said reinforcement connector inner walls have threads adapted to said prefabricated bridge deck slab reinforcement and said U-shaped connector ribs.
5. The wet joint structure of the steel and concrete composite bridge deck slab as claimed in claim 4, wherein the length of the prefabricated bridge deck slab reinforcing steel bar overhanging countersunk tapping is 50-70 mm, preferably 60 mm.
Or the length of the U-shaped connecting rib end countersunk tapping is 50-70 mm, preferably 60 mm.
6. The wet joint structure of the steel-concrete composite bridge deck slab as claimed in claim 1, wherein the length of the reinforcing bar connector is 50-60 mm; preferably, it is 55 mm.
7. The wet joint construction of steel-concrete composite bridge deck slab of claim 1, wherein said connector is carbon structural steel.
8. A bridge deck construction method, comprising connecting prefabricated bridge decks using the wet joint construction of a steel and concrete composite bridge deck according to any one of claims 1 to 7.
9. The bridge deck construction method according to claim 8, wherein the construction method comprises the following specific steps: after the steel-concrete composite bridge panel is placed, installing U-shaped connecting ribs, and then pouring wet joints; preferably, the casting material is micro-expansion low-shrinkage concrete.
10. The bridge deck construction method of claim 8, wherein the preparation method of the steel-concrete composite bridge deck comprises the following steps: placing the bridge deck steel bars on a prefabricated pedestal after countersunk tapping the two ends of the bridge deck steel bars; placing a steel bar connector at the end part of a bridge deck steel bar, tensioning the bridge deck steel bar through tensioning equipment, pouring concrete, and demolding to obtain the reinforced concrete combined bridge deck; preferably, the tensioning device is a prestressed through jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010264551.4A CN111424531A (en) | 2020-04-07 | 2020-04-07 | Wet joint structure of steel-concrete combined bridge deck slab and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010264551.4A CN111424531A (en) | 2020-04-07 | 2020-04-07 | Wet joint structure of steel-concrete combined bridge deck slab and construction method |
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| CN111424531A true CN111424531A (en) | 2020-07-17 |
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| CN202010264551.4A Pending CN111424531A (en) | 2020-04-07 | 2020-04-07 | Wet joint structure of steel-concrete combined bridge deck slab and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086467A (en) * | 2021-11-24 | 2022-02-25 | 中铁四局集团第五工程有限公司 | Prefabricated installation construction method for steel-concrete composite beam bridge deck |
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2020
- 2020-04-07 CN CN202010264551.4A patent/CN111424531A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114086467A (en) * | 2021-11-24 | 2022-02-25 | 中铁四局集团第五工程有限公司 | Prefabricated installation construction method for steel-concrete composite beam bridge deck |
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