CN210458906U - Assembled bridge structure in tunnel - Google Patents
Assembled bridge structure in tunnel Download PDFInfo
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- CN210458906U CN210458906U CN201921260004.8U CN201921260004U CN210458906U CN 210458906 U CN210458906 U CN 210458906U CN 201921260004 U CN201921260004 U CN 201921260004U CN 210458906 U CN210458906 U CN 210458906U
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Abstract
The utility model provides an assembled bridge structures in tunnel, include: two prefabricated bridge decks that horizontal symmetry set up on the lower part supporting component of tunnel installation, two the relative outside of prefabricated bridge deck is connected with the tunnel section of jurisdiction that corresponds respectively, two through the wet seam connection of central authorities between the prefabricated bridge deck, two prefabricated bridge deck is respectively certainly a lateral direction tunnel central authorities tilt up of tunnel section of jurisdiction, and then prefabricated bridge deck is right the tunnel section of jurisdiction produces compressive stress. The prefabricated bridge deck is provided with the inclination angle, so that the prefabricated bridge deck is thrust to the opposite outer side under the action of upper load and dead weight, the thrust acts on a tunnel segment and a central wet joint to reduce adverse positive bending moment, prevent the joint of the prefabricated bridge deck and the tunnel segment from cracking and improve the tensile strength of a bridge structure, and the thickness of the prefabricated bridge deck is reduced, the number of splicing joints is reduced, and the operation amount of cast-in-place plates is increased.
Description
Technical Field
The utility model relates to a tunnel and bridge technical field relates to an assembled bridge structures in tunnel particularly.
Background
The traditional bridge construction mode has the disadvantages of long construction period, great influence on traffic, high overall energy consumption, large field manual workload, high labor cost and particularly serious influence on the environment caused by field operation, and the prefabricated assembled bridge is standardized in design, industrially manufactured in factories, unified in prefabrication construction quality, less in field construction operation and less in influence on environment and traffic, is a construction technology vigorously created by the nation at present, particularly rapidly develops in urban municipal construction, and has been issued and implemented by a plurality of national design specifications. Nowadays, the fabricated bridge can be developed comprehensively, and the fully fabricated urban bridge structure covering the pile foundation, the pier stud, the capping beam, the abutment, the retaining wall, the main beam and the anti-collision guardrail is researched and developed and gradually becomes the mainstream of urban bridge construction.
At present, the assembly type bridge has acquired more practical experience, and the main performance is that the structural construction is developed by combining new materials and processes such as UHPC, grouting sleeves and the like, and the structural design forms relevant specifications, but the relevant specifications do not limit the innovation of the structure and the construction.
Different from the conventional prefabricated bridge, the construction of the bridge in the tunnel is limited by the construction space, the transportation hoisting machinery is limited, and the like, so that the bridge constructed in the current tunnel is mostly constructed on site, or is prefabricated by adopting small components, and then is assembled by combining with the construction operation on site, the joints and seams needing to be constructed on site are more, the corresponding field operation amount is large, the advantages of a prefabricated assembly structure are greatly weakened, more complex construction requirements are brought to the design, and the hidden danger is brought to the later-period usability.
The design of the bridge in the existing tunnel still refers to the conventional design thought, and the column, the beam and the plate are decomposed into standardized design modes, so that the number of prefabricated parts is large, the number of corresponding joints is large, the plate bears large bending moment, and the structural stress requirement can be guaranteed only by considering the beam plate with a larger section for the tunnel space which cannot apply transverse prestress. Taking the design project of the bridge in the conventional tunnel as an example, although a transverse hollow plate structure and a longitudinal beam structure are adopted, in order to ensure the transportation and installation space and consider more standard modular structures as much as possible, the bridge deck needs to consider more outer side spaces as much as possible, and the problem is brought that the bridge deck part has more cast-in-place concrete work, and the assembly rate is reduced. Meanwhile, due to the fact that the post-cast part and the precast part have different construction stages, the precast part is bent under stress, the section thickness is large, meanwhile, the concrete slab or the precast slab cast on site is pulled inwards, and the service performance and the durability of the concrete slab are inevitably influenced under the condition that no prestress is exerted.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, the utility model provides an assembled bridge structures in tunnel can reduce the unfavorable moment of flexure that the structure atress produced to reducible prefabricated decking thickness, more can furthest's reduction splice joint quantity and on-the-spot cast-in-place work volume, thereby realize on-the-spot concrete placement operation at a minimum, realize that prefabricated assembly ization rate improves more than 95%, it is many to solve current bridge structures prefab, connect in large quantity, the assembly rate is low and influence the technical problem of concrete performance and durability.
In order to achieve the purpose, the utility model adopts the technical proposal that: there is provided an in-tunnel fabricated bridge structure, comprising:
the prefabricated bridge deck structure comprises two prefabricated bridge deck plates, wherein the two prefabricated bridge deck plates are transversely and symmetrically arranged on an existing supporting part (can be an upright post or a vertical plate structure) in a tunnel, the opposite outer sides of the two prefabricated bridge deck plates are respectively connected with corresponding tunnel pipe pieces, the two prefabricated bridge deck plates are connected through a central wet joint, the two prefabricated bridge deck plates are respectively upwards inclined from one side of each tunnel pipe piece to the center of the tunnel, a three-span continuous structure is formed by means of the lower supporting part, and under the action of upper load, pressure stress is further generated on the tunnel pipe pieces. After the prefabricated bridge deck slab is connected with the lower support, the prefabricated bridge deck slab becomes a three-span continuous rigid frame structure, and the positive and negative bending moments of the prefabricated bridge deck slab are further adjusted.
In an embodiment of the present invention, the supporting member is a vertical column or a vertical plate.
The embodiment of the utility model provides an in, each prefabricated decking is followed respectively the length direction in tunnel extends, each prefabricated decking includes along the beam slab lattice structure of tunnel length direction concatenation.
In the embodiment of the utility model provides an in, two the relative outside of prefabricated decking respectively with the well sub-unit connection of tunnel section of jurisdiction.
In the embodiment of the utility model, the angle scope of prefabricated decking and horizontal plane is 1% ~ 5%.
The embodiment of the utility model provides an in, two connect fixedly, adjacent two through the section of jurisdiction built-in fitting between the relative outside of prefabricated decking and the tunnel section of jurisdiction that corresponds pass through the reinforcing bar butt joint between the prefabricated decking, the reinforcing bar bury in advance in the prefabricated decking.
The embodiment of the utility model provides an in, the wet seam in central authorities adopts UHPC concrete placement to form to make full use of UHPC is at the tensile and compressive property in biggest positive moment district.
The utility model discloses owing to adopted above technical scheme, make it have following beneficial effect:
(1) the utility model discloses set up the wet seam connection of central authorities between the two prefabricated decking that horizontal symmetry set up, reduce current a plurality of wet seams and be a wet seam, left out the cast-in-place board construction between prefabricated decking and tunnel segment in the prior art simultaneously.
(2) Compared with the simple support plate, the simple support plate only has positive bending moment, and needs larger bending rigidity for resisting the positive bending moment, so the simple support plate needs thicker plate thickness; after the central wet joint is adopted and the simple support plate is changed into a continuous plate, the corresponding positive bending moment is reduced.
The utility model discloses two prefabricated decking receives upper portion load and dead weight to produce the thrust to the relative outside, the wet seam of central authorities is located the maximum bending moment district of striding, the wet seam of central authorities relies on the resistance to compression and the tensile characteristic of self to overcome and has had the positive bending moment of reduction after, and then correspondingly reducible prefabricated bridge deck plate thickness, reduce the dead weight and the hoist and mount weight of prefabricated decking (reduce the dead weight and be favorable to the installation or can do bigger prefab under the same hoist and mount condition), reduce the material quantity, alleviate lower part support cross sectional size, more can furthest's reduction concatenation seam quantity and cast-in-place board work load to realize that on-the-spot concrete placement operation is minimum, realize that prefabricated assembly ization rate improves more than 95%.
Meanwhile, the maximum stress value (lower edge tension and upper edge compression) generated by positive bending moment is the central wet joint, and the position is just the UHPC material which is needed by people, so that the characteristics of rapid UHPC construction and high tensile strength are fully exerted, and the central wet joint is prevented from being damaged by tension.
(3) The transverse thrust of the utility model acts on the corresponding tunnel segment and generates the pressure stress to the tunnel segment, and the tunnel segment correspondingly generates the transverse counter-force acting on the prefabricated bridge deck plate so as to resist the bending moment effect generated by the upper load and the dead weight of the prefabricated bridge deck plate; due to the existence of the compressive stress, the prefabricated bridge deck and the tunnel segment structure can be always in a pressed state, so that the condition that the connection between the prefabricated bridge deck and the tunnel segment is cracked due to the fact that the original bridge structure in the tunnel cannot be transversely prestressed is changed; in addition, because the vehicle is the main load between two supporting parts, the prefabricated bridge deck can be downwarped to pull the pedestrian boards on the side to the center, so that the concrete slab is damaged, and the concrete can be prevented from being damaged by the transverse counter force.
(4) The utility model discloses prefabricated bridge deck's vertical prefabricated length is nimble, can adopt beam slab form structure, is convenient for transport and assembly construction.
(5) The prefabricated member of the utility model comprises a prefabricated bridge deck and a supporting component, the number of the prefabricated members is small, the number of joints is small, and the operable space in the tunnel is more flexible; there is not cast-in-place board between precast bridge panel and the tunnel segment, can not appear because precast part and post-cast part have different problems in the construction stage, and precast part is crooked because of the atress, leads to the concrete slab of cast in situ or precast slab to be drawn to the inboard, under not having prestressing force effect, can influence concrete slab's performance and durability.
Drawings
Fig. 1 is the sectional layout schematic diagram of the assembled bridge structure in the tunnel of the utility model.
Fig. 2 is a cross-sectional view of the cross-section of the present invention 1-1.
Fig. 3 is the stress principle schematic diagram of the assembled bridge structure in the tunnel of the utility model.
The correspondence of reference numerals to components is as follows:
a support member 1; prefabricating a bridge deck 2; a beam-slab lattice structure 21; a transverse wet seam 22; a tunnel segment 3; a central wet seam 4; a dry seam 5.
Detailed Description
To facilitate understanding of the present invention, the following description is made with reference to the accompanying drawings and examples.
Please refer to fig. 1, the utility model provides an assembled bridge structures in tunnel, include two prefabricated decking 2 that transverse symmetry set up on the lower part supporting component 1 of tunnel installation, prefabricated decking 2 is located on the lower part supporting component 1, two the relative outside of prefabricated decking 2 is connected with the tunnel section of jurisdiction 3 that corresponds respectively, two through the wet seam 4 of central authorities connect between the prefabricated decking 2, two prefabricated decking 2 is respectively from a side of tunnel section of jurisdiction 3 is to tunnel central authorities tilt up, and then prefabricated decking 2 is to tunnel section of jurisdiction 3 produces compressive stress.
In the embodiment of the present invention, two prefabricated bridge decks 2 receive upper load and self weight to generate thrust along the inclined direction of the prefabricated bridge decks 2, the thrust acts on the central wet joint 4 to generate tension on the central wet joint 4, and the central wet joint 4 resists the tension and compression stress generated by the positive bending moment generated by the prefabricated bridge decks 2 receiving upper load and self weight by means of the tensile and compression characteristics of the central wet joint 4; the thrust acts on the corresponding tunnel segment 3 and generates a compressive stress on the tunnel segment 3, and the tunnel segment 3 correspondingly generates a counter force acting on the prefabricated bridge deck 2 so as to resist a positive bending moment generated by the upper load and the dead weight of the prefabricated bridge deck 2.
In the embodiment of the utility model, two prefabricated bridge decks 2 are of a straight plate structure, compared with a prefabricated arc-shaped plate structure, the prefabricated difficulty can be reduced, and the prefabricated construction is convenient; the opposite outer sides of the two prefabricated bridge deck plates 2 are respectively connected with the middle lower part of the tunnel segment 3, and the angle range of the prefabricated bridge deck plates 2 and the horizontal plane is 1% -5%. In actual construction, according to the difference of tunnel span, can set up different angles in order to produce the thrust of equidimension not, when tunnel diameter is great, corresponding increase prefabricated decking 2's inclination is in order to produce great thrust, and when tunnel diameter is less, corresponding reduction prefabricated decking 2's inclination is in order to produce less thrust.
As shown in fig. 2, the lower supporting part 1 is a vertical column or a vertical plate, and the lower supporting part 1 extends along the length direction of the tunnel to support the prefabricated bridge deck 2 above the tunnel; the number of the lower supporting parts 1 is two, and the lower supporting parts are symmetrically arranged below the prefabricated bridge deck 2 in the tunnel. Preferably, a temporary support (not shown) is provided under the prefabricated bridge deck 2, which is movable within the tunnel to provide temporary support when the prefabricated bridge deck 2 is installed.
The utility model discloses each prefabricated decking 2 extends along the length direction in tunnel respectively, each prefabricated decking 2 includes along the beam slab lattice structure 21 of tunnel length direction concatenation, beam slab lattice structure 21 includes the mainboard and is fixed in the floor below the mainboard, the floor is used for consolidating the mainboard, the floor can set up along the length direction of mainboard, also can set up along the width direction of mainboard, or set up vertically and horizontally below the mainboard; the longitudinal length of each beam-slab lattice structure 21 is limited by the working capacity of a carrying machine in the tunnel and the radius of a tunnel curve, and the beam-slab lattice structures 21 can facilitate the transportation and assembly construction of the prefabricated bridge deck 2 in the tunnel space.
The utility model discloses prefabricated decking 2 only has two of bilateral symmetry for have bigger construction space (nearly half tunnel space), the inside operable space in tunnel is more nimble, can adopt a plurality of roof beam slab lattice structures 21 concatenation to form, and is adjacent connect through concrete placement between the roof beam slab lattice structure 21, as shown in figure 2 be the horizontal wet seam 22 between the adjacent roof beam slab lattice structure 21, compare with the simple beam, the roof beam slab lattice structure 21 atress condition is good, can reduce prefabricated decking 2's thickness, makes prefabricated decking 2 structures frivolous, and save material is convenient for transport and assembly construction simultaneously.
In the embodiment of the utility model, the prefabricated bridge deck 2 and the supporting component 1 can be prefabricated integrally, and can also be separately prefabricated, so as to reduce the field construction amount, the lower supporting component 1 of the utility model needs to consider the structure rotating hinge 11 generated by thrust, and the position of the rotating hinge 11 is determined on the lower supporting component 1 according to the stress of the supporting point; when the prefabricated bridge deck 2 and the top of the lower supporting component 1 are connected into a whole in advance, the rotating hinge 11 is arranged at the bottom of the lower supporting component 1, and when the prefabricated bridge deck 2 and the lower supporting component 1 are prefabricated separately, the rotating hinge 11 is arranged at the connecting part of the prefabricated bridge deck 2 and the lower supporting component 1; the rotary hinges 11 are arranged temporarily, and after the prefabricated bridge deck 2 is installed and positioned, the rotary hinges 11 are eliminated through concrete pouring and other construction modes. During the actual installation and construction of the prefabricated bridge deck 2, a plurality of measures can be taken, for example, after the inclination angle or the height of a certain point of the prefabricated bridge deck 2 is determined by measuring the height, the prefabricated bridge deck 2 and the tunnel segment 3 are fixed by adopting a temporary measure, the lower part of the prefabricated bridge deck 2 and the lower supporting component 1 are temporarily fixed, and the opposite inner side of the prefabricated bridge deck 2 is temporarily fixed, so that the prefabricated bridge deck 2 can form the desired inclination angle by means of the support.
The embodiment of the utility model provides an in, prefabricated decking 2 and 3 butt joints of tunnel section of jurisdiction adopt dry joint seam, be equipped with on the tunnel section of jurisdiction 3 with the built-in fitting that prefabricated decking 2 is connected, be equipped with corresponding connection structure on prefabricated decking 2, better, prefabricated decking 2 with gap intussuseption between the tunnel section of jurisdiction is filled with the epoxy.
The assembled bridge structure further comprises a sidewalk and an auxiliary channel, wherein the sidewalk and the auxiliary channel are located on the side of the prefabricated bridge deck 2.
The embodiment of the utility model provides an in, wet seam 4 in central authorities adopts UHPC to pour fast, both can accelerate the construction progress, also can produce the precompression to prefabricated decking 2 simultaneously, avoids overcoming the thickness requirement that prefabricated decking 2 led to by the bending completely by the structure, full play UHPC intensity and workability characteristics. Preferably, two adjacent prefabricated bridge deck boards 2 are butted through reinforcing steel bars, and the reinforcing steel bars are respectively embedded in the prefabricated bridge deck boards 2.
The longitudinal central wet joint 4 is arranged between the two prefabricated bridge decks, and the opposite outer sides of the prefabricated bridge decks are connected with the corresponding tunnel segments, so that (1) the existing wet joints are reduced into one wet joint; (2) the construction of cast-in-place plates between the two sides of the prefabricated bridge deck slab 2 and the tunnel segment 3 is omitted; (3) the prefabricated bridge deck 2 and the tunnel segment 3/tunnel wall structure can be always in a pressed state, so that the condition that the connection between the bridge deck and the tunnel is cracked due to the fact that the original bridge structure in the tunnel cannot be transversely prestressed is changed; (4) the wet joint is positioned at the center of the lane, so that the tensile property of the UHPC is fully utilized, the advantages of compression resistance, tensile resistance and workability are exerted, and the rapid construction is realized; (5) by reducing the positive bending moment, the thickness of the prefabricated bridge deck 2 can be reduced, thereby saving materials and hoisting weight, and reducing the cross-sectional size of the lower support and the like.
As shown in fig. 3, explained from the force bearing point of view, because the pre-arched prefabricated bridge deck is supported on the lower supporting member 1, the prefabricated bridge deck 2 will generate a pushing force F2 under the action of the use load and the self-weight F1 of the structure, the pushing force F2 will generate a counter force F3 by means of the circumferential constraint deformation of the tunnel segment 3/tunnel wall to act on the prefabricated bridge deck 2, so that the prefabricated bridge deck 2 overcomes the positive bending moment generated by the load, the prefabricated bridge deck 2 is transmitted on the top rotating hinge 11 of the lower supporting member 1, and the whole load action is balanced by the supporting force F4 of the lower supporting member 1.
It should be noted that when the diameter of the tunnel is large and the number of lanes inside is large, the above method can still be adopted, a prefabricated flat plate is additionally arranged in the span, the width of the wet joint is adjusted by changing the lower support into the form of inclined legs and the like, and the wet joint is connected with the prefabricated structure (the prefabricated bridge deck and the support component) to realize the arch effect and achieve the same effect.
The above concrete introduction the utility model discloses assembled bridge structures in tunnel, its construction method is explained below, including following step:
s1; providing the prefabricated bridge deck 2 and the lower support member 1;
s2: after the lower support member 1 is mounted in place, the prefabricated bridge deck 2 is transported onto the lower support member 1 for installation:
s3: placing the prefabricated bridge deck 2 on the lower supporting part 1 by adopting an installation machine, adjusting the inclination angle of the prefabricated bridge deck to enable the prefabricated bridge deck to incline upwards from one side of the tunnel segment to the center of the tunnel, and butting one end of the prefabricated bridge deck with the tunnel segment;
preferably, the method further comprises the steps of arranging a temporary support below the prefabricated bridge deck 2, and placing a prefabricated bridge deck 2 on the lower supporting part 1 and the temporary support by adopting an installation machine, wherein the temporary support can run in the tunnel to move to the position below the prefabricated bridge deck 2 to be installed according to the requirement;
s4: installing another prefabricated bridge deck 2 symmetrically to the prefabricated bridge deck 2 in place in the manner of step S3, and reserving a seam between the prefabricated bridge deck 2 and the other prefabricated bridge deck 2;
in the embodiment of the utility model, the prefabricated bridge deck 2 comprises a plurality of beam slab lattice structures 21 spliced along the length direction of the tunnel, each prefabricated bridge deck 2 is installed along the length direction of the tunnel in a segmented manner, and the beam slab lattice structures 21 on both sides of the joint are symmetrically installed; the beam slab lattice structures 21 adjacent to each other in the tunnel length direction are connected through UHPC concrete pouring; after the two symmetrical beam-slab lattice structures 21 are installed, moving the temporary support to the next adjacent section of beam-slab lattice structure 21 for repeated construction;
s5: after all the beam-slab lattice structures 21 are installed, concrete is poured into the joints between the two prefabricated bridge deck panels 2 to connect the two prefabricated bridge deck panels.
Better, treat that installation length reaches when setting up expansion joint department, auxiliary structure such as layer and crashproof wall is mated formation in the installation, produces more sufficient effort between bridge deck plate structure and tunnel section of jurisdiction, carries out grouting between 2 boards of prefabricated bridge deck and 3 wall joints of tunnel section of jurisdiction.
S6: the prefabricated panels are connected to the joints of the lower supporting members 1 (uprights or risers) by means of UHPC.
The present invention has been described in detail with reference to the drawings and the embodiments, and those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details of the embodiments should not be construed as limitations of the invention, which are intended to be covered by the following claims.
Claims (7)
1. An assembled bridge construction in a tunnel, comprising:
two prefabricated bridge decks that horizontal symmetry set up on the lower part supporting component of tunnel installation, two the relative outside of prefabricated bridge deck is connected with the tunnel section of jurisdiction that corresponds respectively, two through the wet seam connection of central authorities between the prefabricated bridge deck, two prefabricated bridge deck is respectively certainly a lateral direction tunnel central authorities tilt up of tunnel section of jurisdiction, and then prefabricated bridge deck is right the tunnel section of jurisdiction produces compressive stress.
2. The bridge construction assembly in a tunnel of claim 1, wherein the lower support member is a vertical column or a vertical plate.
3. The bridge construction assembly in tunnel of claim 1, wherein each of the prefabricated bridge deck panels extends along a length direction of the tunnel, and each of the prefabricated bridge deck panels comprises a beam-slab lattice structure spliced along the length direction of the tunnel.
4. The bridge structure of claim 1, wherein opposite outer sides of the two prefabricated bridge deck panels are connected to the middle-lower portion of the tunnel segment, respectively.
5. The fabricated bridge structure in a tunnel of claim 1, wherein the angle of the prefabricated bridge deck with respect to a horizontal plane ranges from 1% to 5%.
6. The assembly type bridge structure in the tunnel of claim 1, wherein the opposite outer sides of two prefabricated bridge deck plates are fixedly connected with the corresponding tunnel segments through segment embedded parts, the adjacent two prefabricated bridge deck plates are butted through reinforcing steel bars, and the reinforcing steel bars are pre-embedded in the prefabricated bridge deck plates.
7. The fabricated bridge construction in a tunnel of claim 1, wherein the central wet joint is formed using UHPC concrete casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921260004.8U CN210458906U (en) | 2019-08-06 | 2019-08-06 | Assembled bridge structure in tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921260004.8U CN210458906U (en) | 2019-08-06 | 2019-08-06 | Assembled bridge structure in tunnel |
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| CN210458906U true CN210458906U (en) | 2020-05-05 |
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| CN201921260004.8U Active CN210458906U (en) | 2019-08-06 | 2019-08-06 | Assembled bridge structure in tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331645A (en) * | 2019-08-06 | 2019-10-15 | 上海市市政规划设计研究院有限公司 | Assembled bridge structure and its construction method in tunnel |
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2019
- 2019-08-06 CN CN201921260004.8U patent/CN210458906U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331645A (en) * | 2019-08-06 | 2019-10-15 | 上海市市政规划设计研究院有限公司 | Assembled bridge structure and its construction method in tunnel |
| CN110331645B (en) * | 2019-08-06 | 2024-06-14 | 上海市市政规划设计研究院有限公司 | Assembled bridge structure in tunnel and construction method thereof |
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