CN112853912B - Structure of wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area - Google Patents
Structure of wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area Download PDFInfo
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- CN112853912B CN112853912B CN202110037808.7A CN202110037808A CN112853912B CN 112853912 B CN112853912 B CN 112853912B CN 202110037808 A CN202110037808 A CN 202110037808A CN 112853912 B CN112853912 B CN 112853912B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D1/00—Bridges in general
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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Abstract
The invention belongs to the field of bridge structure construction, and particularly relates to a structure of a simply supported to continuous fulcrum hogging moment area of a wood-concrete composite beam bridge.
Description
Technical Field
The invention relates to the field of bridge structure construction, in particular to a structure of a simply supported variable continuous fulcrum hogging moment area of a wood-concrete composite beam bridge.
Background
The bridge deck continuous simply-supported girder bridge is widely applied to the construction of urban viaducts due to the characteristics of convenient construction, simple stress and the like. The wood-concrete combined simply supported beam fully utilizes the tensile property of wood and the compression property of concrete, but the simply supported beam bridge is influenced by the expansion joint, so that the running performance and durability are poor, the maintenance cost is high, and therefore the wood-concrete combined simply supported beam bridge deck needs to be continuously seamless. However, when the bridge surface of the two-span or multi-span simply supported beam is continuous, a negative bending moment appears at the lower fulcrum under the action of load, and the low bending-tension performance of the concrete does not meet the structural stress requirement and is easy to crack under tension. For a general reinforced concrete structure, steel bars or even prestressed tendons are usually configured in a pivot hogging moment area to resist bending and pulling effects, the reinforced concrete structure has large self weight, concrete is a heterogeneous material, and under the action of temperature load, cracking risks exist, and the stress of a main beam and the durability of the structure are influenced.
Disclosure of Invention
The invention aims to: the structure solves the problem that the bridge deck is discontinuous due to the arrangement of the expansion device because the large longitudinal deformation is generated under the load action of temperature and the like in a two-span or multi-span wood-concrete combined simple-supported beam bridge (L is less than or equal to 200 m) in the prior art, and provides the structure of the hogging moment area for changing the simple support of the wood-concrete combined beam bridge into the continuous pivot.
According to the structure of the wood-concrete composite beam bridge simply supported variable continuous fulcrum negative moment area, the fulcrum negative moment area is locally constructed by the high-ductility concrete (SHCC) bridge deck connecting plate, so that the stress of the negative moment and the driving performance of a vehicle are improved, the durability of the bridge structure is improved, the design and construction are simple and convenient, and the later maintenance cost of the bridge can be reduced.
The purpose of the invention can be realized by the following technical scheme: a structure of a wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area comprises: a two-span or multi-span simply supported structure; the composite pressure bearing plate comprises a wood beam, piers, supports, SHCC bridge deck connecting plates, reinforcing steel bars in the connecting plates, a composite pressure bearing plate, self-adhesive compressible sealing materials, reinforcing steel bars in a bridge deck plate, a wood-concrete shear connecting piece and a bridge deck plate; wherein, SHCC bridge deck connecting plates are arranged at two adjacent bridge span ends of the wood-concrete combined simply-supported girder bridge; the bridge pier is provided with a support, the support is loaded with wood beams, and an SHCC bridge deck connecting plate is formed to connect bridge decks of two adjacent wood beams; the SHCC bridge deck connecting plate is arranged in a tension area at the upper edge of the bridge deck, and on the upper side of the shear connecting piece, the bridge deck and the wood beam form a whole through the shear connecting piece to jointly participate in stress.
On the upper side of the shear connector, the bridge deck plates of adjacent wood beams are connected with the bridge deck plate internal reinforcing steel bars of the pre-embedded bridge deck plates through connecting plate internal reinforcing steel bars, so that the SHCC bridge deck connecting plate is connected with the two adjacent bridge deck plates into a whole; a synthetic pressure base plate is arranged at the bottom of the SHCC bridge deck connecting plate to form an unbonded area; the bottom of the composite pressure pad and between two adjacent bridge decks and two adjacent wood beams are filled with a self-adhesive compressible sealing material.
Wherein, the support adopts a sliding support.
The self-adhesive compressible sealing material consists of halogenated butyl rubber, saturated polyisobutylene, butyl rubber, isocyanate, bentonite and active light calcium carbonate; and moreover, a low-modulus sealant is adopted on a contact surface of the SHCC bridge deck connecting plate, and a high-modulus sealant is adopted on a contact surface of the SHCC bridge deck connecting plate and a bridge deck plate.
The bridge deck comprises a two-span or multi-span simply supported structure (L is less than or equal to 200 m), an SHCC bridge deck connecting plate and a wood-concrete shear connector, wherein the SHCC connecting plate is arranged in a tension area at the upper edge of a bridge deck, no or a small amount of reinforcements can be arranged in the connecting plate, the length of the connecting plate is 2-8 m (determined according to the length and the stress performance of the connected bridge span), and the SHCC bridge deck connecting plate and a wood beam form a whole body to jointly participate in stress through the shear connector, so that the bridge deck is continuous and seamless. The bottom of the SHCC bridge deck connecting plate is padded with the synthetic pressure base plate to form an unbonded area, so that the rigidity of the structure is increased, the stress of the structure is optimized, the relative movement of adjacent wood beams is prevented from being damaged, the connecting plate can be prevented from being damaged by water and other harmful substances, self-adhesive compressible sealing materials are stuffed between two adjacent beam ends, and the longitudinal deformation between the beam bodies is self-adapted.
By adopting the technical scheme, the SHCC bridge deck connecting plate structure eliminates the telescopic device of the wood-concrete combined simply-supported bridge, realizes the continuous change of the simple support of the wood-concrete combined bridge with medium and small spans, reduces the maintenance and replacement cost of the telescopic device in the later period, improves the running performance of the wood-concrete combined bridge, improves the durability of the structure, and has the advantages of simple design, convenient construction and huge social benefit. The invention can be used for not only reconstructing the old bridge but also constructing the new bridge, and has strong practicability and wide application range. The invention is particularly suitable for the seamless structure of the bridge deck of the medium-small span wood-concrete composite beam bridge.
Drawings
FIG. 1 is a schematic structural view of an SHCC bridge deck connecting plate at a road and bridge junction according to the present invention;
reference numbers in the figures:
the method comprises the following steps of 1-wood beam, 2-pier, 3-support, 4-SHCC bridge deck connecting plate, 5-connecting plate internal reinforcing steel bar, 6-synthetic pressure pad, 7-self-adhesive compressible sealing material, 8-bridge deck internal reinforcing steel bar, 9-wood-concrete shear connecting piece and 10-bridge deck.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
FIG. 1 is a structural diagram of a hogging moment zone structure of a wood-concrete composite beam bridge with a simple support and a continuous pivot and a SHCC bridge deck connecting plate at a bridge deck expansion joint, as shown in the figure,
a structure of a wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area comprises:
a two-span or multi-span simply supported structure; the self-adhesive composite bridge comprises a wood beam 1, piers 2, supports 3, SHCC bridge deck connecting plates 4, connecting plate internal reinforcing steel bars 5, a synthetic pressure base plate 6, self-adhesive compressible sealing materials 7, bridge deck internal reinforcing steel bars 8, a wood-concrete shear connecting piece 9 and a bridge deck 10;
wherein, SHCC bridge deck connecting plates 4 are arranged at two adjacent bridge span ends of the wood-concrete combined simply-supported girder bridge;
the bridge pier 2 is provided with a support 3, the support 3 is loaded with wood beams 1, and an SHCC bridge deck connecting plate 4 forms a bridge deck 10 for connecting two adjacent wood beams 1;
the SHCC bridge deck connecting plate 4 is arranged in a tension area at the upper edge of a bridge deck 10, and on the upper side of a shear connecting piece 9, the bridge deck 10 and the wood beam 1 form a whole through the shear connecting piece 9 to jointly participate in stress;
on the upper side of the shear connector 9, the bridge decks 10 of the adjacent wood beams 1 are connected with the bridge deck internal steel bars 8 of the pre-embedded bridge decks 10 through the connecting plate internal steel bars 5, so that the SHCC bridge deck connecting plate 4 and the two adjacent bridge decks 10 are connected into a whole; a synthetic pressure base plate 6 is arranged at the bottom of the SHCC bridge deck connecting plate 4 to form an unbonded area; a self-adhesive compressible sealing material 7 is packed in the bottom of the composite pressure pad 6 and between two adjacent bridge decks 10 and two adjacent wood beams.
Wherein, the support 3 adopts a sliding support.
Wherein, the self-adhesive compressible sealing material 7 consists of halogenated butyl rubber, saturated polyisobutylene, butyl rubber, isocyanate, bentonite and active light calcium carbonate; and in the self-adhesive compressible sealing material 7, a low-modulus sealant is adopted at the contact surface with the SHCC bridge deck connecting plate 4, and a high-modulus sealant is adopted at the contact surface with the bridge deck 10.
Before the SHCC bridge floor connecting plate 4 is poured, the contact surface of a bridge deck 10 connected with the SHCC bridge floor connecting plate 4 is roughened, a synthetic pressure base plate 6 is arranged at the bottom of the SHCC bridge floor connecting plate 4, a bonding-free area is formed, and the stress is optimized.
Wherein, the chloroprene rubber: has good cohesiveness, waterproofness, shock resistance and compressibility, and isocyanate: as a sealant, the sealant ensures the sealing property and moderate tensile modulus and elasticity; bentonite: as a thixotropic agent, the thixotropy is ensured; active light calcium: as a reinforcing agent, has good reinforcing effect; the effects of good bonding, sealing and water proofing are achieved, and the service life of the wood-concrete combined simply supported beam can be effectively prolonged.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A structure of a wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area comprises:
a two-span or multi-span simply supported structure; the bridge deck comprises a wood beam (1), piers (2), supports (3), SHCC bridge deck connecting plates (4), connecting plate internal reinforcing steel bars (5), a synthetic pressure base plate (6), self-adhesive compressible sealing materials (7), bridge deck internal reinforcing steel bars (8), wood-concrete shear connectors (9) and bridge deck plates (10);
wherein, SHCC bridge deck connecting plates (4) are arranged at two adjacent bridge-spanning ends of the wood-concrete combined simply-supported girder bridge;
the bridge pier (2) is provided with a support (3), the support (3) is provided with a wood beam (1), and an SHCC bridge deck connecting plate (4) is formed to connect bridge decks (10) of two adjacent wood beams (1);
the SHCC bridge deck connecting plate (4) is arranged in an upper edge tension area of a bridge deck (10) and is arranged on the upper side of a shear connector (9), and the bridge deck (10) and the wood beam (1) form a whole through the shear connector (9) to jointly participate in stress;
on the upper side of the shear connector (9), the bridge deck plates (10) of adjacent wood beams (1) are connected with the bridge deck plate internal steel bars (8) of the pre-embedded bridge deck plates (10) through the connecting plate internal steel bars (5), so that the SHCC bridge deck connecting plate (4) is connected with the two adjacent bridge deck plates (10) into a whole; a synthetic pressure base plate (6) is arranged at the bottom of the SHCC bridge deck connecting plate (4) to form an unbonded area; self-adhesive compressible sealing materials (7) are filled at the bottom of the composite pressure pad (6) and between two adjacent bridge decks (10) and two adjacent wood beams;
the support (3) adopts a sliding support;
the self-adhesive compressible sealing material is characterized in that the self-adhesive compressible sealing material (7) consists of halogenated butyl rubber, saturated polyisobutylene, butyl rubber, isocyanate, bentonite and active light calcium carbonate;
and in the self-adhesive compressible sealing material (7), a low-modulus sealant is adopted on the contact surface with the SHCC bridge deck connecting plate (4), and a high-modulus sealant is adopted on the contact surface with the bridge deck plate (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110037808.7A CN112853912B (en) | 2021-01-12 | 2021-01-12 | Structure of wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110037808.7A CN112853912B (en) | 2021-01-12 | 2021-01-12 | Structure of wood-concrete composite beam bridge simply supported variable continuous fulcrum hogging moment area |
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| CN112853912A CN112853912A (en) | 2021-05-28 |
| CN112853912B true CN112853912B (en) | 2022-11-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114592428A (en) * | 2022-04-21 | 2022-06-07 | 江苏梦联桥科技有限公司 | Low-modulus high-toughness composite material, continuous bridge deck connecting plate member and construction process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3371102B2 (en) * | 2000-02-23 | 2003-01-27 | ショーボンド建設株式会社 | Bridge expansion joint |
| KR101688517B1 (en) * | 2016-05-10 | 2016-12-22 | 주식회사 하이드로코리아 | Continuous bridge construction method using support pier girder and continuous tendon of pier |
| CN108425313B (en) * | 2018-05-15 | 2024-04-26 | 中南林业科技大学 | Wood-ultra-high performance concrete composite beam and construction method thereof |
| CN210827072U (en) * | 2019-04-12 | 2020-06-23 | 浙江工业大学 | Middle seamless telescopic structure of middle and small-span simply-supported highway bridge |
| CN109914235B (en) * | 2019-04-22 | 2021-09-03 | 张旭云 | Bridge deck continuous structure |
| CN210712557U (en) * | 2019-05-29 | 2020-06-09 | 中交第二公路勘察设计研究院有限公司 | Hogging moment district UHPC handles steel-mixes integrated configuration |
| CN110130220B (en) * | 2019-06-21 | 2024-03-05 | 浙江数智交院科技股份有限公司 | Novel concrete bridge surface continuous structure applied to beam bridge |
| CN211200026U (en) * | 2019-09-05 | 2020-08-07 | 辽宁省交通规划设计院有限责任公司 | Simply support steel-concrete composite beam decking continuous structure |
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