CN111254802A - Precast beam structure, assembly type temporary bridge and installation method thereof - Google Patents
Precast beam structure, assembly type temporary bridge and installation method thereof Download PDFInfo
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- CN111254802A CN111254802A CN202010189692.4A CN202010189692A CN111254802A CN 111254802 A CN111254802 A CN 111254802A CN 202010189692 A CN202010189692 A CN 202010189692A CN 111254802 A CN111254802 A CN 111254802A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009434 installation Methods 0.000 title abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 144
- 239000010959 steel Substances 0.000 claims abstract description 144
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 77
- 210000001503 joint Anatomy 0.000 claims abstract description 19
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 14
- 238000003466 welding Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
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- 238000012938 design process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 230000003014 reinforcing 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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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
- E01D15/00—Movable or portable bridges; Floating bridges
- E01D15/12—Portable or sectional bridges
- E01D15/133—Portable or sectional bridges built-up from readily separable standardised sections or elements, e.g. Bailey 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
- E01D19/005—Piers, trestles, bearings, expansion joints or parapets specially adapted for portable or sectional 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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
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Abstract
A precast beam structure, an assembled temporary bridge and an installation method thereof relate to the technical field of bridge engineering. The precast beam structure comprises a reinforced concrete bridge deck and at least two section steel main beams, wherein at least one side of the reinforced concrete bridge deck is provided with a butt joint part, two opposite side walls of the butt joint part are provided with embedded steel plates, the embedded steel plates are connected with steel bars in the reinforced concrete bridge deck, a step groove is formed between the side surface of the reinforced concrete bridge deck and the embedded steel plates, and the reinforced concrete bridge deck is provided with a first mounting hole penetrating through the embedded steel plates and the butt joint part. The upper wing of each section steel main beam is connected with the lower surface of the reinforced concrete bridge deck to form a steel-concrete combined beam, the upper wing of each section steel main beam is connected with at least one shear connector, and each shear connector is embedded in the reinforced concrete bridge deck; the novel steel temporary bridge is simple in structure, solves the problems of high manufacturing cost, poor comfort, high noise, trouble in installation and the like of a conventional steel temporary bridge, improves the driving safety, and reduces later-period maintenance cost.
Description
Technical Field
The application relates to the technical field of bridge engineering, in particular to a precast beam structure, an assembled temporary bridge and an installation method thereof.
Background
The upper part of the conventional temporary bridge mostly adopts a Bailey beam structure which comprises Bailey sheets, transverse distribution beams, steel bridge decks and the like. The conventional temporary bridge structure adopts an assembly type structure, has relatively simple structure and high construction speed, and is relatively convenient to install and disassemble, so that the application is relatively wide. However, it also has the following problems: the building height is high (about 1.8 m-2 m), and in the region with limited upper span clear height and the same longitudinal slope index, the bridge scale and the engineering cost can be increased; under the action of frequent vehicle loads, the problems of falling off, warping, poor anti-skid performance and the like exist in the practical use of the steel bridge deck, and the traffic safety is influenced if the temporary bridge deck is not repaired in time; the components of the temporary bridge are connected by bolts in large quantity, so that the temporary bridge is easy to loosen and has higher later-period maintenance cost; the noise is big still to have when the suspension bridge uses, and the travelling comfort is relatively poor scheduling problem.
In the engineering construction of the Ganzaomu bridge, in order to complete the engineering construction of the artificial island and the supporting facilities on the island as required, the temporary construction temporary access bridge at the Zhuhai port is built to solve the traffic problem in the construction period in the island on the basis of comparing the high investment cost of marine transportation. The upper structure of the access bridge of the temporary bridge adopts a prestressed concrete simply-supported small box girder with the span of 25m, and the lower structure adopts a steel pipe pile. The temporary bridge structure has the advantages of strong spanning capability, large bearing capability, small water resistance and the like, but has the advantages of long construction period, high manufacturing cost, large difficulty in transporting and hoisting the main beam, incapability of repeatedly utilizing the upper concrete beam plate and poor environmental protection performance, so that the temporary bridge structure is rarely applied to most temporary bridges.
The temporary bridge for the highway with the three bridges of Yangtze river, Nanjing and Changjiang river, which is extended from the north of the Zhongxing road, adopts a railway D-shaped 24m combined construction temporary beam structure. The temporary beam adopts a plurality of independent rectangular steel box beams, the steel box beams are connected by steel cross beams, the top of a main beam is 0.21m higher than the cross beams, 10 type channel steel is paved on the cross beams to serve as a bridge deck longitudinal beam, 10cm multiplied by 10cm square wood is paved on the longitudinal beam to serve as a bridge deck cross beam, a 12mm thick steel plate is paved to serve as a bridge deck, and a 6mm thick pattern steel plate is directly sleeved on the main beam. This just roof beam structure has advantages such as the roof beam height is lower relatively, the span is great relatively, but the connection between its decking, square timber crossbeam, channel-section steel longeron and the steel crossbeam drops easily, and the steel decking warp easily, upwarps, produces great influence to driving safety and travelling comfort, and the noise is great, consequently uses comparatively fewly.
The present application is made in view of the above-mentioned disadvantages of the bridge.
Disclosure of Invention
The present application provides a precast beam structure, an assembled temporary bridge, and a method of installing the same to improve the above-mentioned problems.
The precast beam structure of the first aspect embodiment of the present application includes a reinforced concrete deck slab and at least two steel girders.
The reinforced concrete bridge deck is provided with a butt joint part on at least one side, two opposite side walls of the butt joint part are provided with embedded steel plates, the embedded steel plates are connected with steel bars in the reinforced concrete bridge deck, a step groove is formed between the side face of the reinforced concrete bridge deck and the embedded steel plates, and the reinforced concrete bridge deck is provided with a first mounting hole penetrating through the embedded steel plates and the butt joint part.
The upper wing of each section steel girder is connected with the lower surface of the reinforced concrete bridge deck to form a steel-concrete combined beam, and the steel-concrete combined beam bears the force and the external load together, the upper wing of each section steel girder is connected with at least one shear connector, and each shear connector is embedded in the reinforced concrete bridge deck.
According to the precast beam structure of this application embodiment, it adopts shaped steel-concrete combination mode to make the atress more reasonable, and directly at mill machine-shaping, make follow-up field installation of being convenient for form the temporary bridge, compare in traditional bailey beam, adopt shaped steel girder to support, make the whole height of the temporary bridge that precast beam structure built be less than with conventional bailey beam temporary bridge (building height is about 1.8m ~ 2m), when striding the limited region of clean height on, under equal longitudinal slope and abutment fill high index control, can obviously shorten bridge length, reduce engineering overall cost. The arrangement of the shear connectors enables the section steel main beam to be stably connected with the reinforced concrete bridge deck.
In addition, the precast beam structure according to the embodiment of the present application has the following additional technical features:
in combination with the first aspect, in some embodiments shown in the present application, the embedded steel plate is provided with a limiting portion engaged with a side surface of the reinforced concrete bridge deck, and the limiting portion extends toward a side away from the abutting portion.
Through the setting of spacing portion, when preventing that follow-up installation from forming the suspension bridge, the connection steel plate is direct to be contacted with reinforced concrete decking, damages reinforced concrete decking.
In some embodiments, in combination with the first aspect, the steel main beam is hot rolled steel.
The hot-rolled section steel girder can be formed in a steel mill in one step by hot rolling, and wing plates and webs of the hot-rolled section steel girder do not need to be welded, so that the construction process is simplified, and the fatigue resistance of the stressed section steel girder is greatly improved.
In combination with the first aspect, in some embodiments shown in the present application, one side of the reinforced concrete deck slab is provided with a butt joint portion, and the other side of the reinforced concrete deck slab is provided with a guardrail pre-embedded base, the guardrail pre-embedded base is arranged on the upper surface of the reinforced concrete deck slab, the back surface of the guardrail pre-embedded base is provided with a connecting bar embedded in the reinforced concrete deck slab, and the connecting bar is connected with the upper wing of the profiled steel main beam.
The precast beam structure with the above-mentioned specific conditions that set up mainly installs in the both sides of suspension bridge, and wherein, the pre-buried base of guardrail passes through the connection bar to be connected with the upper limb of shaped steel girder, effectively stabilizes the pre-buried base of guardrail, satisfies the anticollision requirement of guardrail, does not influence reinforced concrete decking's intensity simultaneously.
In combination with the first aspect, the present application illustrates some embodiments in which both sides of the reinforced concrete bridge deck are provided with abutments.
The precast beam structure having the above-described specifically set conditions is mainly installed at the middle of the access bridge.
In some embodiments, the precast beam structure further includes a first cross member for connecting two adjacent main steel beams.
Through the setting of above-mentioned first crossbeam for two at least shaped steel girders form wholly through first crossbeam, common atress, the stability of the supporting effect and the support of further improvement shaped steel girder simultaneously.
The fabricated access bridge of the second aspect of the present application comprises at least two precast beam structures of the first aspect of the present application, a connecting structure for connecting two adjacent reinforced concrete deck slabs, and a deck pavement.
Wherein the abutting parts of two adjacent precast beam structures are abutted so that the two step grooves form a groove.
The connecting structure comprises a connecting steel plate which is placed in the groove and covers the two prefabricated steel plates, and a connecting piece which is matched with the first mounting hole and used for fixing the prefabricated steel plates, the connecting steel plate and the butt joint part.
The bridge deck pavement is laid on the upper surface of each reinforced concrete bridge deck after connection.
According to the fabricated temporary bridge of the embodiment of the second aspect of the application, the fabricated temporary bridge is assembled by using the precast beam structure, and has the advantages of convenience in installation, high construction efficiency and convenience in later maintenance, and the reinforced concrete bridge decks of the adjacent precast beam structures are connected through the connecting structure, so that the external load borne by a certain reinforced concrete bridge deck is transferred to the adjacent reinforced concrete bridge decks, and the adjacent reinforced concrete bridge decks share the external load. Meanwhile, the bridge deck is formed by a reinforced concrete bridge deck and a bridge deck pavement, so that the bridge deck is not easy to damage, and the later-period maintenance cost is low; and the bridge deck has high rigidity, good anti-skid performance, good driving safety and comfort, low driving noise and small influence on the surrounding environment.
In combination with the second aspect, in some embodiments shown in this application, be located two precast beam structures of assembled temporary bridge both sides, every precast beam structure's the outside is equipped with the pre-buried base of guardrail that is used for installing the guardrail respectively, and the splice bar of the pre-buried base of guardrail is connected with the shaped steel girder that corresponds.
In combination with the second aspect, the present application illustrates some embodiments in which the fabricated access bridge further includes a second cross member for connecting two adjacent steel main beams at the junction of two precast beam structures.
Through the connection of second crossbeam, further make two adjacent precast beam structures form wholly, transmit the atress of a shaped steel girder to another shaped steel girder, guarantee the stability of temporary bridge under the load condition.
In the installation method of the fabricated temporary bridge according to the embodiment of the third aspect of the present application, when the fabricated temporary bridge includes the second cross member and the guardrail, the installation method includes:
at least two prefabricated assembled composite beams are obtained.
And hoisting the prefabricated assembled combination beams to a target position, butting the butting parts of the two adjacent prefabricated assembled combination beams and connecting the butting parts through a connecting mechanism.
And after the second cross beam is connected, constructing guardrails and paving the bridge deck. The installation method is simple to operate, the construction efficiency is effectively improved, and the construction difficulty is reduced.
The invention has the following beneficial technical effects:
compared with the conventional Bailey beam temporary bridge, the assembled temporary bridge has the advantages that the building height is obviously reduced, and when the bridge spans a limited area with the clear height, the length of the bridge can be obviously shortened under the control of the same longitudinal slope and abutment filling height indexes, so that the construction cost is reduced.
Compared with the steel bridge deck of the conventional Bailey beam temporary bridge, the bridge deck of the fabricated temporary bridge is formed by paving the reinforced concrete bridge deck and the bridge deck, so that the bridge deck is not easy to damage, and the later-period maintenance cost is lower; the bridge deck has high rigidity, good anti-sliding performance and good driving safety and comfort; the noise of driving is lower, and is less to the surrounding environment influence.
The assembled temporary bridge and precast beam structure can realize industrialized manufacturing, is convenient to assemble and disassemble on site, can be recycled, and has the remarkable advantages of being green, energy-saving, efficient and rapid. And the precast beam structure has light weight and convenient transportation and hoisting due to small span.
Therefore, the precast beam structure provided by the application is particularly suitable for the temporary bridge with the medium and small span, namely the assembled temporary bridge with the medium and small span.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural view of an assembled access bridge;
FIG. 2 is a schematic view of a precast beam structure from a first perspective as a center beam structure;
FIG. 3 is a schematic structural view from a second perspective of a precast beam structure as a center beam structure;
FIG. 4 is a schematic structural view of a precast beam structure as an edge beam structure;
fig. 5 is an assembly view of the connection structure.
Icon: 10-fabricated access bridge; 100-precast beam structure; 110-steel main beam; 120-a first beam; 130-a shear connector; 140-reinforced concrete bridge deck; 150-a docking station; 160-pre-buried steel plates; 161-step groove; 163-first mounting hole; 170-pre-burying a base of the guardrail; 180-guard bar; 200-a connecting structure; 210-connecting steel plates; 220-a connector; 300-paving a bridge deck; 400-a second beam; 500-target position.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Examples
Referring to fig. 1, an assembled temporary bridge 10 mainly includes a precast beam structure 100, a connecting structure 200, and a bridge deck 300, and the assembled temporary bridge 10 is particularly suitable for a medium-small span temporary bridge.
Referring to fig. 2, 3 and 4, the precast beam structure 100 includes a steel girder 110 and a reinforced concrete deck slab 140.
The steel girder 110 is hot-rolled section steel which is formed in one step by hot rolling in a steel mill, and the upper wing, the lower wing and the web plate of the steel girder 110 are not required to be welded, so that the construction process is simplified, and the fatigue resistance of the stressed steel girder 110 is greatly improved; it can be purchased directly from the market.
The number of the steel girders 110 is at least two, the steel girders 110 are symmetrically arranged on two sides of the reinforced concrete bridge deck 140 in the X direction to ensure the stability of the support of the steel girders 110, and each steel girder 110 extends along the Y direction of the reinforced concrete bridge deck 140, wherein the X direction is perpendicular to the Y direction. Wherein, the number of the steel girder 110 is, for example, two, four or five.
The section steel main beam 110 refers to a main beam that is i-shaped in the X direction, that is, the section steel main beam 110 herein includes at least one of i-shaped section steel and H-shaped section steel. The specification span of the section steel main beam 110 along the Y direction can be 9m-12m, the length of the section steel main beam is consistent with that of the hot rolled section steel I-shaped steel or H-shaped steel in the market, butt welding or bolting required by the lengthening of the hot rolled section steel is avoided, the processing procedure is simplified, the precast beam structure 100 is enabled to be more universal, and the precast beam structure 100 is also lighter due to the smaller span.
In this embodiment, the number of the steel girders 110 is two, the two steel girders 110 are arranged on two sides of the reinforced concrete bridge deck 140 in the X direction, and along the Y direction, each i-shaped girder is slightly smaller than or flush with two side walls of the reinforced concrete bridge deck 140 along the Y direction, so as to ensure the stability of the support, and enhance the anti-overturning capability of the precast beam structure 100 during transportation and hoisting.
Optionally, in order to ensure the stability of the connection, the precast beam structure 100 further includes a first cross beam 120, and the first cross beam 120 is used to connect two adjacent steel main beams 110 by welding or bolting.
In this embodiment, the first cross beam 120 is arranged along the X direction to connect the two steel main beams 110 in this embodiment, and the arrangement manner along the X direction can make the stability of the fabricated access bridge 10 better after the fabricated access bridge 10 is obtained subsequently.
The first cross beams 120 are disposed at the pier fulcrum position or span between the two steel main beams 110, and the number of the first cross beams 120 can be one or more, in this embodiment, one, and the first cross beams 120 are disposed at the span.
The upper wing of each section steel main beam 110 is connected with the lower surface of the reinforced concrete deck slab 140 to form a steel-concrete composite beam, the section steel main beams 110 and the reinforced concrete deck slab in the steel-concrete composite beam bear the force and bear the external load together, the upper wing of each section steel main beam 110 is connected with at least one shear connecting member 130, such as one, three, seven and the like, when the number of the shear connecting members 130 is more than two, the shear connecting members 130 are arranged at intervals along the Y direction, and in order to ensure the stability after installation, the shear connecting members 130 are welded on the upper wing of the section steel main beam 110. The shear connector 130 is specifically a shear pin, for example.
Optionally, the shear connector 130 is welded to the upper wing of the steel girder 110 to ensure the stability of the connection.
Specifically, each shear connector 130 is embedded in the reinforced concrete deck slab 140, that is, the section steel main beam 110 and the reinforced concrete deck slab 140 form a whole through the shear connector, and are stressed together.
In order to adapt the precast beam structure 100 to a medium-small span bridge, the weight of each reinforced concrete deck slab 140 can be reduced, and transportation and hoisting are facilitated.
Wherein, the reinforced concrete bridge deck 140 has a butt-joint portion 150 at least one side in the X direction, and the butt-joint portion 150 is a concrete reinforcement integrally formed with the reinforced concrete bridge deck 140.
As shown in fig. 2, when both sides of the reinforced concrete bridge deck 140 have the butting parts 150, the precast beam structure 100 is regarded as a center sill structure; as shown in fig. 4, when the reinforced concrete bridge deck 140 has the abutting portion 150 on only one side, the precast beam structure 100 is used as a side beam structure.
It should be noted that the abutting portions 150 of the center sill structure and the side sill structure are arranged and function the same, specifically as follows:
every relative both sides wall of butt joint portion 150 has pre-buried steel sheet 160, and in this embodiment, the both sides wall that butt joint portion 150 is located the Z direction has pre-buried steel sheet 160, and Z direction perpendicular to X direction and Y direction, also is that the Z direction is vertical, and butt joint portion 150 is located vertical upper and lower both sides wall and has pre-buried steel sheet 160, and this direction is downward, is convenient for follow-up the installation.
The embedded steel plates 160 are connected with the steel bars in the reinforced concrete bridge deck 140, a step groove 161 is formed between the side surface of the reinforced concrete bridge deck 140 and the embedded steel plates 160, and the reinforced concrete bridge deck 140 is provided with first mounting holes 163 penetrating through the embedded steel plates 160 and the butt joint part 150.
The back of the pre-buried steel plate 160 is provided with a fixed steel bar (not shown), and the fixed steel bar is connected with the steel bar in the reinforced concrete bridge deck 140, so that the stability of the pre-buried steel plate 160 can be effectively improved, and the strength of the reinforced concrete bridge deck 140 is not affected.
In order to ensure the stability of installation, the embedded steel plates 160 penetrate through two side walls of the reinforced concrete bridge deck 140 in the Y direction.
One side of the boundary beam structure departing from the abutting part 150 is provided with a guardrail embedded base 170 for installing a guardrail 180, wherein the guardrail embedded base 170 is arranged on the upper surface of the reinforced concrete bridge deck 140, the back of the guardrail embedded base 170 is provided with a connecting rib (not shown) embedded in the reinforced concrete bridge deck 140, and the connecting rib is connected with the upper wing of the profiled steel main beam 110, such as welding or bolting. Through the arrangement, the anti-collision requirement of the guardrail 180 is effectively met.
It should be noted that, the center sill structure and the side sill structure are directly manufactured integrally in a factory, and do not need to be additionally installed, so that the working efficiency is improved.
The fabricated temporary bridge 10 may be connected by the connecting structure 200 after being butted by only two edge beam structures, or may be connected by the connecting structure 200 after being butted by two edge beam structures and at least one middle beam structure. In any case, the two precast beam structures 100 located at both sides of the fabricated temporary bridge 10 are provided with guardrail pre-embedded bases 170 for installing guardrails 180, as the side beam structures.
Specifically, the connecting structure 200 is used to connect two adjacent butt joints 150, so as to form two adjacent precast beam structures 100.
Referring to fig. 1 and 5, the connection structure 200 includes a connection steel plate 210 and a connection member 220.
After the actual connection, the abutting portions 150 of the adjacent two precast beam structures 100 are abutted so that the two step grooves 161 form grooves for receiving the connection steel plates 210.
The connection steel plate 210 is placed in the groove and covers the two prefabricated steel plates, the connection steel plate 210 has second mounting holes (not shown) corresponding to the first mounting holes 163 one to one, and the first mounting holes 163 are communicated with the corresponding second mounting holes.
The connector 220 is fitted to the first mounting hole and fixes the prefabricated steel plate, the connection steel plate 210, and the docking portion. Specifically, the connecting member 220 sequentially penetrates through the first mounting hole 163 and the second mounting hole to fix the prefabricated steel plate, the connecting steel plate 210 and the butt-joint portion together, and then connects the two adjacent reinforced concrete bridge decks 140 through the connecting steel plate 210, so as to transfer an external load applied to a certain concrete bridge deck to the adjacent concrete bridge deck, and thus, the adjacent concrete bridge decks jointly bear the external load.
Wherein, the connecting piece 220 can be a similar U-shaped piece, which has two parallel free ends and a connecting portion for connecting the two free ends, and the axis of the connecting shaft is perpendicular to the free ends, and the two free ends respectively extend out of the connecting steel plate 210 and are fixed by nuts, and can be effectively fixed by the similar U-shaped piece, and the two free ends of the similar U-shaped piece can respectively penetrate through the two adjacent butt joint portions 150.
In this embodiment, the connecting members 220 are bolts, and the number of the bolts corresponds to the number of the second mounting holes one to one.
That is, the fabricated temporary bridge 10 connects the adjacent reinforced concrete bridge decks 140 by bolts, is convenient to assemble and disassemble on site, can be repeatedly used, and has the remarkable advantages of being green, energy-saving, efficient and rapid.
Optionally, the cross section of the embedded steel plate 160 may be in a straight shape or in a similar L shape, and since the connection steel plate 210 is placed in the groove in the actual use process, in order to avoid direct rigid contact between the connection steel plate 210 and the reinforced concrete bridge deck 140, in this embodiment, the cross section of the embedded steel plate 160 is in a similar L shape.
Specifically, the pre-buried steel plate 160 is provided with a limiting portion matched with the side surface of the reinforced concrete bridge deck 140, and the limiting portion extends towards one side departing from the abutting portion 150.
The deck pavement 300 is laid on the upper surface of each of the reinforced concrete deck boards 140 after the connection, and wraps the connection structures 200 positioned on the upper surfaces of the reinforced concrete deck boards 140 to prevent the connection structures 200 from being exposed. Furthermore, the bridge deck pavement 300 and the reinforced concrete bridge deck 140 are matched with each other, so that the bridge deck is not easy to damage, and the later-period maintenance cost is low; the bridge deck has high rigidity, good anti-skid performance and better driving safety and comfort; the noise of driving is also lower, and the influence to the surrounding environment is less.
The bridge deck pavement 300 comprises asphalt concrete bridge deck pavement 300 or concrete bridge deck pavement 300 and the like, and the bridge deck cross slope can be set through the thickness change of the bridge deck pavement 300, so that bridge deck water accumulation can be prevented, and specific limitation is not made herein.
In order to further improve the stability of the connection between two adjacent prefabricated composite girders, the prefabricated temporary bridge 10 further includes a second cross member 400, and the second cross member 400 is used for connecting two adjacent steel main girders 110 at the connection between two prefabricated girder structures 100 by welding or bolting.
The second cross beam 400 is disposed at a pier fulcrum position or a span between the two steel main beams 110.
It should be noted that the fabricated temporary bridge 10 with the above-mentioned arrangement structure has better applicability to oblique and curved bridges.
And the height of the conventional Bailey beam temporary bridge is about 1.8 m-2 m, the height of the prefabricated beam structure 100 obtained by the method is greatly reduced due to the action of the section steel main beam 110, the building height of the span of 12m or less is about 0.9 m-1 m generally, and when the prefabricated beam structure is used in an upper span clear height limited area, the length of the bridge can be obviously shortened under the control of the same longitudinal slope and bridge abutment filling height indexes, and the total construction cost is reduced.
The embodiment of the present application further provides an installation method of the above-mentioned fabricated temporary bridge 10, which includes:
at least two prefabricated assembled composite beams are obtained.
And hoisting the prefabricated assembled combination beams to a target position 500 such as a pier top capping beam or a cross beam, and butting the butting parts 150 of the two adjacent prefabricated assembled combination beams and connecting the two adjacent prefabricated assembled combination beams through a connecting mechanism.
After the connection is completed, the bridge deck pavement 300 is constructed.
When the second cross beam 400 and the guardrail 180 are arranged on the fabricated composite beam, the fabricated composite beam is butted and connected by the connecting mechanism and then is paved on the bridge deck 300, and the installation method further comprises the following steps: the second cross member 400 is used to connect the adjacent two steel main beams 110 at the junction of the two precast beam structures 100, and then the guard rail 180 is installed.
It should be noted that in the actual design process of the present embodiment, the model number and the distance of the steel girders 110, the thickness and the reinforcing bars of the reinforced concrete bridge deck 140, and the like are calculated according to the vehicle load on the bridge; the vehicle load inspection system can also be designed according to the road-I vehicle load, and can be used after other special vehicle loads are checked and calculated and meet the standard requirements.
In conclusion, the precast beam structure, the assembled temporary bridge and the installation method thereof are convenient to disassemble and install, the problems of high manufacturing cost, poor comfort, high noise, troublesome installation and the like of the conventional steel temporary bridge are solved, the driving safety is improved, and the later-stage maintenance cost is reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A precast beam structure, comprising:
the reinforced concrete bridge deck is provided with a butt joint part at least on one side, two opposite side walls of the butt joint part are provided with embedded steel plates, the embedded steel plates are connected with steel bars in the reinforced concrete bridge deck, a step groove is formed between the side surface of the reinforced concrete bridge deck and the embedded steel plates, and the reinforced concrete bridge deck is provided with a first mounting hole penetrating through the embedded steel plates and the butt joint part; and
the upper wing of each section steel girder is connected with the lower surface of the reinforced concrete bridge deck to form a steel-concrete combined beam, and bears the force and the external load together, the upper wing of each section steel girder is connected with at least one shear connector, and each shear connector is embedded in the reinforced concrete bridge deck.
2. The precast beam structure of claim 1, wherein the steel main beam is hot rolled steel.
3. The precast beam structure according to claim 1, wherein the embedded steel plates are provided with a stopper portion engaged with a side surface of the reinforced concrete deck slab, the stopper portion extending toward a side away from the abutting portion.
4. The precast beam structure according to claim 1, wherein the butt joint portion is provided at one side of the reinforced concrete deck slab, a guardrail pre-embedding base for installing a guardrail is provided at the other side of the reinforced concrete deck slab, the guardrail pre-embedding base is provided at an upper surface of the reinforced concrete deck slab, a connecting rib embedded in the reinforced concrete deck slab is provided at a back surface of the guardrail pre-embedding base, and the connecting rib is connected with an upper wing of the profiled steel main beam.
5. The precast beam structure according to claim 1, wherein both sides of the reinforced concrete deck slab are provided with butting portions.
6. The precast beam structure of claim 1, further comprising a first cross beam for connecting adjacent two of the steel main beams.
7. An assembly-type access bridge, comprising:
at least two precast beam structures according to any one of claims 1 to 5, abutting portions of adjacent two precast beam structures abutting so that two step grooves form a groove;
the connecting structure is used for connecting two adjacent reinforced concrete bridge decks and comprises connecting steel plates and connecting pieces, the connecting steel plates are placed in the grooves and cover the two prefabricated steel plates, and the connecting pieces are matched with the first mounting holes and fix the prefabricated steel plates, the connecting steel plates and the butt joint parts; and
and the bridge deck pavement is paved on the upper surface of each of the reinforced concrete bridge deck plates after connection.
8. The assembly type temporary bridge according to claim 7, wherein a guardrail pre-embedded base for installing a guardrail is arranged on the outer side of each of the two precast beam structures on two sides of the assembly type temporary bridge, and connecting ribs of the guardrail pre-embedded bases are connected with the corresponding section steel main beams.
9. The fabricated access bridge of claim 7, further comprising a second cross beam for connecting two adjacent steel main beams at a junction of two of the precast beam structures.
10. A method of installing the fabricated access bridge of any one of claims 7-9, wherein when the fabricated access bridge includes the second cross member and the guard rail, the method comprises:
obtaining at least two prefabricated assembled composite beams;
hoisting the prefabricated assembled combination beams to a target position, butting the butting parts of the two adjacent prefabricated assembled combination beams and connecting the butting parts through a connecting mechanism;
and after the second cross beam is connected, constructing guardrails and paving the bridge deck.
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| CN202010189692.4A CN111254802A (en) | 2020-03-18 | 2020-03-18 | Precast beam structure, assembly type temporary bridge and installation method thereof |
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| CN202010189692.4A CN111254802A (en) | 2020-03-18 | 2020-03-18 | Precast beam structure, assembly type temporary bridge and installation method thereof |
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Cited By (1)
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| CN114016379A (en) * | 2021-11-26 | 2022-02-08 | 巨力索具研究院(天津)有限公司 | Emergent combination bridge of pin-connected panel |
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