CN108166372B - Prefabricated T-shaped beam and construction method thereof - Google Patents
Prefabricated T-shaped beam and construction method thereof Download PDFInfo
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- CN108166372B CN108166372B CN201711465472.4A CN201711465472A CN108166372B CN 108166372 B CN108166372 B CN 108166372B CN 201711465472 A CN201711465472 A CN 201711465472A CN 108166372 B CN108166372 B CN 108166372B
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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
- E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a prefabricated T-shaped beam and a construction method thereof, belonging to the field of bridge prefabricated members; this prefabricated T roof beam includes longeron and the fixed decking that sets up on the longeron, the decking includes prefabricated base and prefabricated apron, be equipped with damper between prefabricated base and the prefabricated apron, the last indent shaping of prefabricated base has the inner groovy, damper includes rubber bed course and prefabricated structural slab, prefabricated structural slab is alternative interval setting with the rubber bed course, the indent shaping of prefabricated structural slab bottom has the structural trough, the corresponding protruding shaping of rubber bed course upper surface has the rubber arch, vertical pre-buried threaded reinforcement in the longeron, the vertical through-hole of having seted up on the decking, prefabricated base, damper and prefabricated apron are worn to establish in proper order by the threaded reinforcement. The invention provides a prefabricated T-shaped beam and a construction method thereof, which can greatly accelerate the construction progress, prolong the service life of a bridge and greatly improve the seismic performance and the use safety of the bridge.
Description
Technical Field
The invention relates to a bridge prefabricated part, in particular to a prefabricated T-shaped beam and a construction method thereof.
Background
T-beams are a form of superstructure often employed in highway fabricated bridges. Compared with two common assembly type prefabricated structures, namely a hollow slab and a small box girder, the section efficiency index of the T-shaped girder is highest, and the economic span is largest; compared with the cast-in-place continuous beam, the prefabricated T beam adopts a method of simply supporting first and then continuously constructing, combines the advantages of the batch prefabricated production of the simply supported beam and the advantages of the continuous beam, realizes the batch prefabricated production mode to accelerate the construction of the continuous beam, reduces the construction difficulty, ensures the construction quality, accelerates the construction progress and reduces the construction cost.
The invention patent with Chinese patent No. CN105019350B discloses a prefabricated T-shaped beam and a method for constructing a continuous beam bridge by using the same, the T-shaped beam is an improved form of a conventional prefabricated T-shaped beam, a lower flange is added at the end part of the T-shaped beam, the cross section of the end part of the T-shaped beam is in an I shape, a longitudinal prestressed pore channel is arranged in the lower flange, and a longitudinal prestressed pore channel is also arranged in a top plate at the end part of the T-shaped beam.
Above-mentioned technical scheme is through exerting certain prestressing force in the bottom compression district, can avoid appearing the crackle under the effect of temperature etc. and the bottom flange has increased the pressurized area, helps reducing compression district compressive strain. However, similar to the T-shaped beam with the above structure, most of them have the defect of general earthquake-proof performance; for areas with relatively high earthquake occurrence probability, the road bridge adopting the T-shaped beam is difficult to ensure safety, has certain potential safety hazard, and needs to be improved urgently.
Disclosure of Invention
The invention aims to provide a prefabricated T-shaped beam, and the safety of the bridge in use is greatly improved by additionally arranging a damping component in the T-shaped beam.
The first technical object of the present invention is achieved by the following technical solutions: the utility model provides a prefabricated T roof beam, includes longeron and the fixed decking that sets up on the longeron, the decking includes prefabricated base and prefabricated apron, prefabricated base is fixed the setting with prefabricated apron, just be equipped with damper assembly between prefabricated base and the prefabricated apron.
Through adopting above-mentioned technical scheme, set the decking to the structural style of prefabricated base, damper and prefabricated apron combination, under the prerequisite of guaranteeing construction quality, damper can greatly improve the holistic anti-seismic performance of bridge, help improving the security that the bridge used.
The invention is further configured to: the prefabricated base is provided with an inner groove in an inwards concave forming mode, the damping assembly comprises a rubber cushion layer, the rubber cushion layer is embedded in the inner groove, and the rubber cushion layer is at least provided with two layers.
Through adopting above-mentioned technical scheme, through setting up multilayer rubber bed course in the inner groove, when guaranteeing decking overall structure intensity, because the rubber bed course has certain elasticity, when the decking receives violent vibrations, prefabricated apron can realize reciprocal relative displacement with the help of the rubber bed course with prefabricated base, plays power-consuming effect, effectively reduces vibrations to the holistic harm of bridge to improve the security of bridge use, prolong its life.
The invention is further configured to: the damping assembly further comprises a prefabricated structural plate, the prefabricated structural plate and the rubber cushion layer are alternately arranged at intervals in the vertical direction, and the prefabricated structural plate is attached to and abutted against the adjacent rubber cushion layer.
Through adopting above-mentioned technical scheme, add prefabricated structural layer between the rubber bed course, cooperation multilayer rubber bed course, when the decking received vibrations, each layer homoenergetic among the damper assembly realized certain relative displacement, can increase damper assembly whole displacement range to effectively improve damper assembly's power consumption ability, help further improving the antidetonation effect of T roof beam.
The invention is further configured to: the bottom of the prefabricated structure plate is at least inwards concave and formed with a group of structure grooves, and the rubber bulges used for embedding the structure grooves are formed on the upper surface of the rubber cushion layer in a one-to-one corresponding protruding mode.
Through adopting above-mentioned technical scheme, when considering frequently shaking at the decking, the rubber cushion layer probably is difficult to the reconversion after warping, sets up structure groove and rubber arch on prefabricated structure board and rubber cushion layer respectively, can increase the "adhesion force" between prefabricated structure board and the rubber cushion layer, avoids taking place too big irreversible relative displacement between rubber cushion layer and the prefabricated structure board, helps prolonging the life of bridge.
The invention is further configured to: threaded steel bars are vertically pre-embedded in the longitudinal beams, through holes are vertically formed in the bridge deck, and the threaded steel bars sequentially penetrate through the prefabricated base, the damping assembly and the prefabricated cover plate from bottom to top through the through holes.
Through adopting above-mentioned technical scheme, prefabricated base, damper unit and prefabricated apron are worn to establish in proper order by the twisted steel, when accelerating the construction progress, can ensure T roof beam overall structure intensity.
The invention is further configured to: the diameter of the twisted steel bar is at least 2-3cm smaller than that of the through hole.
By adopting the technical scheme, the diameter of the through hole is controlled to be 2-3cm larger than that of the threaded steel bar, and after the lifting is completed, concrete mortar can be poured into the gap between the threaded steel bar and the through hole by workers, so that the structural strength and the stability of the T beam are improved.
The invention is further configured to: the thickness of the rubber cushion layer is at least 5cm, the thickness of the prefabricated structural plate is at least 8cm, and the thickness of the prefabricated structural plate is at most 4cm larger than that of the rubber cushion layer.
By adopting the technical scheme, the thicknesses of the rubber cushion layer and the prefabricated structure plate are respectively not less than 5cm and 8cm, and the integral structural strength of the T-shaped beam and even the bridge can be ensured; meanwhile, the thickness of the prefabricated structural slab is controlled to be at most 4cm larger than that of the rubber cushion layer, and the influence of the undersize thickness of the rubber cushion layer on the displacement amplitude of each layer of the damping assembly is avoided, so that the energy consumption capacity of the damping assembly is fully guaranteed, and the anti-seismic performance of the bridge is guaranteed to reach the standard.
The invention is further configured to: and transverse clapboards are arranged on the longitudinal beams along the length direction of the longitudinal beams at intervals of 5-8 m.
Through adopting above-mentioned technical scheme, through set up the multiunit cross slab on the longeron, can further improve the structural strength of bridge, reduce the risk that T roof beam pressurized damaged.
The second technical purpose of the invention is to provide a construction method for manufacturing the prefabricated T-shaped beam, which greatly improves the seismic performance of the bridge.
The second technical object of the present invention is achieved by the following technical solutions: a construction method for manufacturing the prefabricated T-shaped beam comprises the following steps: hoisting the prefabricated base, the rubber cushion layer, the prefabricated structural plate and the prefabricated cover plate to the upper part of the longitudinal beam in sequence, enabling the threaded steel bars to penetrate through the prefabricated base, the rubber cushion layer, the prefabricated structural plate and the prefabricated cover plate in sequence, and ensuring that the upper ends of the threaded steel bars penetrate out of the upper surface of the bridge deck by 1-2 cm; pouring epoxy mortar concrete into the through hole, and cutting off the redundant part of the twisted steel after the epoxy mortar concrete is completely condensed; and (4) paving a waterproof layer and a protective layer on the upper surface of the prefabricated cover plate in sequence, and transporting the T-shaped beam to a beam storage area integrally after finishing.
By adopting the technical scheme, the working mode of matching batch prefabrication and hoisting is adopted, so that the construction progress can be greatly accelerated; after the hoisting is finished, the threaded steel bars are ensured to extend out of the bridge deck, and epoxy mortar concrete is poured into gaps between the threaded steel bars and the through holes, so that the connection strength between the bridge deck and the longitudinal beams can be improved, and the integral stability and structural strength of the bridge are ensured; in addition, the waterproof layer can improve the waterproof performance of bridge, avoids the rainwater to stretch into the bridge inside and corrode damper assembly, and the protective layer can reduce the risk of bridge surface fracture, extension bridge normal life. Therefore, by adopting the technical scheme, the construction progress can be greatly accelerated, the construction difficulty is reduced, and the anti-seismic performance and the service life of the bridge are greatly improved after the bridge is built.
In conclusion, the invention has the following beneficial effects:
(1) the bridge deck is arranged into a structural form combined with the base, the damping component and the prefabricated cover plate, the excellent energy consumption capacity of the damping component is utilized, the anti-seismic performance of the bridge is improved, the risk of damage to the bridge due to an earthquake is reduced, the service life of the bridge is prolonged, and the use safety of the bridge is greatly improved;
(2) the working mode of batch prefabrication and hoisting matching is adopted, so that prefabrication work of each part of the T-shaped beam can be synchronously performed, the construction difficulty of the bridge is greatly reduced, the construction progress is accelerated, and the construction quality is favorably improved.
Drawings
FIG. 1 is an axial view of the embodiment, which is mainly used for embodying the overall structure of the prefabricated T-shaped beam;
FIG. 2 is an exploded schematic view of the embodiment mainly used for embodying the specific structure of the prefabricated T-beam;
FIG. 3 is a schematic cross-sectional view of the embodiment mainly used for showing the connection relationship between the rebar and the bridge deck;
FIG. 4 is an exploded view of the present embodiment, which is mainly used for embodying the concrete structure of the bridge deck;
fig. 5 is an axial view of the present embodiment, which is mainly used for embodying the prefabricated structural panel.
Reference numerals: 1. a stringer; 2. an upper flange; 3. a diaphragm plate; 4. twisted steel bars; 5. a bridge deck; 51. prefabricating a base; 511. an inner groove; 52. a rubber cushion layer; 521. a rubber bulge; 53. prefabricating a structural plate; 531. a structural groove; 54. prefabricating a cover plate; 6. a through hole; 7. a waterproof layer; 8. and a protective layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to the attached drawing 1, the prefabricated T-shaped beam comprises a longitudinal beam 1, wherein the longitudinal beam 1 is integrally formed by pouring and is vertically arranged. The two sides of the upper end of the longitudinal beam 1 are symmetrically provided with upper flanges 2, and the upper flanges 2 and the longitudinal beam 1 are integrally cast and molded. The two sides of the longitudinal beam 1 are symmetrically provided with transverse clapboards 3, the transverse clapboards 3 and the longitudinal beam 1 are integrally cast and formed, and a group of transverse clapboards is arranged every 5-8m along the length direction of the longitudinal beam 1; the diaphragm plate 3 can greatly improve the overall structural strength and the pressure bearing capacity of the T beam and reduce the risk of the T beam being damaged by pressure.
Referring to the attached drawings 2-3, threaded steel bars 4 are pre-embedded in the upper end face of the longitudinal beam 1 and the upper flange 2, multiple groups of the threaded steel bars 4 are uniformly arranged along the length direction of the longitudinal beam 1, and the upper ends of the threaded steel bars 4 vertically extend upwards out of the longitudinal beam 1.
The bridge deck plate 5 is arranged above the longitudinal beam 1, through holes 6 are vertically formed in the bridge deck plate 5, the through holes 6 and the threaded steel bars 4 are arranged in a one-to-one correspondence mode, and the diameter of each through hole 6 is preferably 2-3cm larger than that of each threaded steel bar 4. During actual construction, workers can hoist the bridge deck 5 to the upper side of the longitudinal beam 1 by means of a gantry crane, so that each twisted steel 4 respectively penetrates through the corresponding through hole 6; it should be noted that after the hoisting is completed, the upper end of the rebar 4 should extend at least 51-2cm beyond the deck slab. After the hoisting is finished, sufficient concrete mortar is poured into the gap between the twisted steel 4 and the through hole 6, so that the connection strength between the longitudinal beam 1 and the bridge deck 5 is ensured.
Referring to fig. 4, the bridge deck 5 includes a prefabricated base 51, the prefabricated base 51 is formed by pouring concrete, and an inner groove 511 is concavely formed on the upper surface of the prefabricated base; a rubber cushion layer 52 is laid in the inner groove 511, and the thickness of the rubber cushion layer 52 is at least 5 cm; the rubber cushion layer 52 is provided with a prefabricated structural plate 53 in a fitting and abutting mode, the prefabricated structural plate 53 is prefabricated by adopting concrete, and the thickness of the prefabricated structural plate 53 is at least 8 cm. The rubber cushions 52 and the prefabricated structural plates 53 are alternately arranged in the inner grooves 511, and at least two groups of the rubber cushions and the prefabricated structural plates are arranged; in order to ensure the structural strength of the T-beam, the thickness of the rubber cushion 52 should be smaller than that of the prefabricated structural plate 53, but the thickness of the rubber cushion 52 is not too small; therefore, the thickness of the prefabricated construction sheet 53 is at most 4cm greater than the thickness of the rubber pad 52.
With the above structure, it is ensured that the rubber cushion 52 is one layer more than the prefabricated structure plate 53, so that the uppermost layer is the rubber cushion 52, and the prefabricated cover plate 54 is arranged above the rubber cushion 52; the prefabricated cover plate 54 is formed by casting concrete, and the lower surface thereof is closely attached to the rubber pad 52. The prefabricated base 51, the rubber cushion 52, the prefabricated structural plate 53 and the prefabricated cover plate 54 integrally form a damping component with energy dissipation function.
In conjunction with fig. 5, considering that when the bridge deck 5 vibrates frequently, irreversible relative displacement may occur between the prefabricated structural slab 53 and the rubber pad 52; in this regard, the lower surface of the prefabricated structural plate 53 is concavely formed with a structural groove 531, and the upper surface of the rubber pad 52 is convexly formed with a rubber protrusion 521; the structure grooves 531 and the rubber protrusions 521 are at least provided in two groups, and the two groups are arranged in a one-to-one correspondence manner. When the hoisting is completed, the rubber protrusions 521 are just embedded in the structural grooves 531; when the bridge deck 5 vibrates, the rubber protrusion 521 is matched with the structure groove 531, so that a certain 'bonding' effect can be realized between the prefabricated structural plate 53 and the rubber cushion 52, and the prefabricated structural plate 53 can be reset by matching with good elasticity of rubber.
The working principle of the embodiment is as follows: the bridge deck 5 is arranged into a structure form of combining the prefabricated base 51, the damping assembly and the prefabricated cover plate 54, and the prefabricated working mode is matched, so that the construction difficulty is greatly reduced, and the construction progress is accelerated; meanwhile, if the bridge deck 5 is severely vibrated, the damping components can play a good energy dissipation role by virtue of reversible relative displacement between the prefabricated structural plate 53 and the rubber cushion 52, so that the overall anti-seismic performance of the bridge is greatly improved, and the service life and the safety of the bridge are ensured.
Example two:
the invention also provides a construction method for manufacturing the prefabricated T-shaped beam, which is used for improving the seismic capacity of the traditional bridge and comprises the following steps:
s1: according to the design requirements of a bridge, the longitudinal beam 1, the prefabricated base 51, the prefabricated cover plate 54, the rubber cushion 52 and the prefabricated structural plate 53 are prefabricated in a factory or on site.
By prefabricating in batches, the prefabrication work of the longitudinal beam 1, the prefabricated base 51, the prefabricated cover plate 54, the rubber cushion 52 and the prefabricated structural plate 53 can be synchronously carried out, and a large amount of intermediate waiting time is saved; therefore, the construction difficulty is greatly reduced, and the construction progress is accelerated.
S2: and hoisting the prefabricated base 51, the rubber cushion layer 52, the prefabricated structural plate 53 and the prefabricated cover plate 54 to the upper part of the longitudinal beam 1 in sequence, so that the deformed steel bars 4 sequentially penetrate through the prefabricated base 51, the rubber cushion layer 52, the prefabricated structural plate 53 and the prefabricated cover plate 54, and the upper ends of the deformed steel bars 4 are ensured to penetrate through the upper surface of the bridge deck 5 by 1-2 cm.
S3: and pouring epoxy mortar concrete into the through hole 6, and cutting off the redundant part of the twisted steel 4 after the epoxy mortar concrete is completely condensed.
By pouring epoxy mortar concrete into the through holes 6, after the epoxy mortar concrete is completely condensed, the epoxy mortar concrete can integrally fix the threaded steel bars 4 and the bridge deck 5 together, so that the bridge deck and the longitudinal beam 1 are completely fixed.
S4: and (4) sequentially paving a waterproof layer 7 and a protective layer 8 on the upper surface of the prefabricated cover plate 54, and transporting the whole T-shaped beam to a beam storage area after finishing.
The waterproof layer 7 can be made of special waterproof coating for roads and bridges, cement-based capillary crystalline waterproof coating, SBS high polymer modified emulsified asphalt waterproof coating, JS composite waterproof coating and the like. Before construction, a worker applies a small brush to a base layer for 2-3 times, then can apply paint for the first time, and can apply paint for the second time and the third time after the paint is completely dried until the ideal thickness is achieved; and after the coating is finished, naturally curing for 24 hours. The protective layer 8 is C40 fine stone fiber concrete, and the fiber is polypropylene cyanine fiber.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. A prefabricated T beam comprises a longitudinal beam (1) and a bridge deck (5) fixedly arranged on the longitudinal beam (1), and is characterized in that the bridge deck (5) comprises a prefabricated base (51) and a prefabricated cover plate (54), the prefabricated base (51) and the prefabricated cover plate (54) are fixedly arranged, and a damping assembly is arranged between the prefabricated base (51) and the prefabricated cover plate (54);
an inner groove (511) is concavely formed in the prefabricated base (51), the shock absorption assembly comprises a rubber cushion layer (52), the rubber cushion layer (52) is embedded in the inner groove (511), and the rubber cushion layer (52) is at least provided with two layers;
the shock absorption assembly further comprises prefabricated structural plates (53), the prefabricated structural plates (53) and the rubber cushion layers (52) are alternately arranged at intervals in the vertical direction, and any prefabricated structural plate (53) is attached to and abutted against the adjacent rubber cushion layer (52);
upper flanges (2) are symmetrically arranged on two sides of the upper end of the longitudinal beam (1), the upper flanges (2) and the longitudinal beam (1) are integrally cast, and threaded steel bars (4) are pre-embedded in the upper end surface of the longitudinal beam (1) and the upper flanges (2); through holes (6) are vertically formed in the bridge deck (5), and the through holes (6) are arranged in one-to-one correspondence with the twisted steel bars (4); each twisted steel (4) respectively penetrates through the corresponding through hole (6), and the twisted steel (4) is fixed with the bridge deck (5) through the concrete mortar pouring through hole (6).
2. The prefabricated T-beam as claimed in claim 1, wherein at least one group of structural grooves (531) are concavely formed at the bottom of the prefabricated structural plate (53), and rubber protrusions (521) for embedding the structural grooves (531) are convexly formed on the upper surface of the rubber cushion layer (52) in a one-to-one correspondence manner.
3. The prefabricated T beam of claim 2, wherein a threaded steel bar (4) is vertically embedded in the longitudinal beam (1), a through hole (6) is vertically formed in the bridge deck (5), and the threaded steel bar (4) sequentially penetrates through the prefabricated base (51), the damping assembly and the prefabricated cover plate (54) from bottom to top through the through hole (6).
4. A prefabricated T-beam according to claim 3, characterised in that the diameter of said rebar (4) is 2-3cm smaller than the diameter of the through-hole (6).
5. A prefabricated T-beam according to claim 1, characterised in that said rubber underlayment (52) has a thickness of at least 5cm, said prefabricated structural slab (53) has a thickness of at least 8cm, and said prefabricated structural slab (53) has a thickness of at most 4cm greater than the rubber underlayment (52).
6. Prefabricated T-beam according to any of the claims 1-5, characterised in that said longitudinal beams (1) are provided with transverse bulkheads (3) every 5-8m along their length.
7. A construction method for manufacturing the prefabricated T-beam of claim 4, comprising the steps of:
s1: according to the design requirements of a bridge, prefabricating a longitudinal beam (1), a prefabricated base (51), a prefabricated cover plate (54), a rubber cushion layer (52) and a prefabricated structural plate (53) in a factory or on site;
s2: sequentially hoisting the prefabricated base (51), the rubber cushion layer (52), the prefabricated structural plate (53) and the prefabricated cover plate (54) to the upper part of the longitudinal beam (1), so that the threaded steel bar (4) sequentially penetrates through the prefabricated base (51), the rubber cushion layer (52), the prefabricated structural plate (53) and the prefabricated cover plate (54), and the upper end of the threaded steel bar (4) is ensured to penetrate through the upper surface of the bridge deck (5) by 1-2 cm;
s3: pouring epoxy mortar concrete into the through hole (6), and after the epoxy mortar concrete is completely condensed, cutting off the redundant part of the twisted steel bar (4);
s4: and (3) sequentially paving a waterproof layer (7) and a protective layer (8) on the upper surface of the prefabricated cover plate (54), and after the waterproof layer and the protective layer are finished, integrally transporting the T-shaped beam to a beam storage area.
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| CN201711465472.4A CN108166372B (en) | 2017-12-28 | 2017-12-28 | Prefabricated T-shaped beam and construction method thereof |
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| CN108166372B true CN108166372B (en) | 2020-05-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110065729A (en) * | 2019-05-17 | 2019-07-30 | 江苏久维压力容器制造有限公司 | A kind of method of embedded transport high pressure gas cylinder |
| CN110359352A (en) * | 2019-08-02 | 2019-10-22 | 中冶长天国际工程有限责任公司 | A kind of prefabricated assembled T beam and construction method |
| CN114000406B (en) * | 2021-11-07 | 2023-10-20 | 中建路桥集团有限公司 | Prefabricated T-beam structure convenient to assemble and construction method |
| CN115198904B (en) * | 2022-08-19 | 2024-04-05 | 河北工业大学 | Assembled insulation board structure and construction method |
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Effective date of registration: 20211221 Address after: 225002 Dongxi Avenue, Gaoyou high tech Industrial Development Zone, Yangzhou City, Jiangsu Province Patentee after: Yangzhou Feng Feng hi tech Industry Investment Development Group Co.,Ltd. Address before: 201500 No. 81, shenpujing South Road, Zhujing Town, Jinshan District, Shanghai Patentee before: JINGTONG CONSTRUCTION (Group) Co.,Ltd. |