CN219710043U - LVL-UHPC combined box girder structure and combined box girder bridge - Google Patents
LVL-UHPC combined box girder structure and combined box girder bridge Download PDFInfo
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- CN219710043U CN219710043U CN202320261517.0U CN202320261517U CN219710043U CN 219710043 U CN219710043 U CN 219710043U CN 202320261517 U CN202320261517 U CN 202320261517U CN 219710043 U CN219710043 U CN 219710043U
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 72
- 210000002435 tendon Anatomy 0.000 claims abstract description 18
- 238000011065 in-situ storage Methods 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 20
- 239000002023 wood Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000004873 anchoring Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000005192 partition Methods 0.000 claims 1
- 210000001503 joint Anatomy 0.000 description 9
- 239000004567 concrete Substances 0.000 description 8
- 238000010008 shearing Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Bridges Or Land Bridges (AREA)
Abstract
The utility model discloses a LVL-UHPC combined box girder structure and a combined box girder bridge, wherein the combined box girder structure comprises a LVL box girder and a UHPC bridge deck positioned above the LVL box girder, the LVL box girder comprises a LVL web plate, a LVL bottom plate and a LVL diaphragm plate, the LVL web plate and the LVL bottom plate form a U-shaped structure, the LVL diaphragm plate is arranged at two ends of the LVL bottom plate, and the LVL diaphragm plate is fixedly connected with the LVL bottom plate and the LVL web plate at the same time; the LVL box girder also comprises prestressed tendons, wherein two ends of each prestressed tendon are respectively anchored to the LVL transverse diaphragms at two ends of the LVL bottom plate. The utility model has the characteristics of environment protection, light dead weight, high rigidity, good durability, high degree of assembly, small in-situ casting quantity, quick and convenient construction and the like, and can be integrally prefabricated.
Description
Technical Field
The utility model relates to the technical field of bridge engineering, in particular to a LVL (Laminated Veneer Lumber ) -UHPC (Ultra-HighPerformance Concrete, ultra-high performance concrete) combined box girder and a combined box girder bridge.
Background
At present, modern wood products in China are mainly used in the non-structural field, and engineering wood for structures occupies a large area and has high manufacturing cost. Therefore, the wood concrete composite structure is developed according to local conditions, accords with the current national conditions of China, and can expand the application range of modern engineering wood, exert the advantages of the modern engineering wood, improve the structural performance and reduce the cost. However, the traditional wood-concrete composite beam is constructed by adopting common concrete, so that the defects of large creep, easiness in cracking and the like are difficult to avoid, and the application of the structure greatly limited by the defects of large dead weight, large long-term deformation and insufficient durability of the traditional wood-concrete composite beam due to the large creep effect of wood. Whereas ultra-high performance concrete (UHPC) has the following advantages over ordinary concrete: 1) The UHPC bridge deck has thin thickness and small dead weight, is beneficial to enhancing the self-crossing capacity, reducing the size of the wood beam and enhancing the economical efficiency of the structure; 2) After the UHPC is steamed at high temperature, the creep coefficient of the UHPC is only 0.2-0.3 times of that of common concrete, so that the long-term deformation of the structure is greatly reduced, and the material strength is fully developed; 3) UHPC tensile strength is high, and the bridge deck is difficult for fracture infiltration, plays good guard action to the timber beams. Laminated Veneer Lumber (LVL) has higher intensity and dimensional stability, is suitable for being used in bridge structures.
Disclosure of Invention
In order to overcome the problems in the prior art, the utility model provides a LVL-UHPC combined box girder structure, and the specific technical scheme is as follows.
The LVL-UHPC combined box girder structure is characterized by comprising an LVL box girder and a UHPC bridge deck arranged above the LVL box girder, wherein the LVL box girder comprises an LVL web plate, an LVL bottom plate and an LVL diaphragm plate, the LVL web plate and the LVL bottom plate form a U-shaped structure, the LVL diaphragm plate is arranged at two ends of the LVL bottom plate, and the LVL diaphragm plate is fixedly connected with the LVL bottom plate and the LVL web plate at the same time; the LVL box girder also comprises prestressed tendons, wherein two ends of each prestressed tendon are respectively anchored to the LVL transverse diaphragms at two ends of the LVL bottom plate.
The LVL has the advantages of uniform structure, high strength, good dimensional stability and the like, can meet the use requirements of wood structure buildings and bridges, is suitable for guiding prestress, greatly improves the structural performance of the LVL box girder by the configuration of the prestress, and can reduce creep deformation of the LVL box girder. UHPC has the advantages of high elastic modulus, high compression strength, high tensile strength, high toughness, high durability, small creep deformation and the like, and realizes the great leap of the engineering material performance; the LVL, UHPC and prestressed tendons with excellent performance are introduced into the combined box girder structure, so that the combined box girder is an effective way for solving the problems of large self weight, large long-term deformation, insufficient durability and the like of the traditional wood-concrete combined girder; the combined box girder has the advantages of high integral rigidity, high spanning capacity, small UHPC bridge deck shrinkage and creep and the like.
Further, a shear member is disposed on top of the LVL web, with a portion of the shear member being located within the LVL web and a portion being located within the UHPC bridge deck. The LVL box girder and the UHPC bridge deck are formed into a whole by a shear member. Further, the top of the LVL web is provided with a plurality of grooves at intervals along the longitudinal direction, and the shear member is fixed to the grooves through screws.
Further, the outer side surface of the LVL diaphragm plate is provided with a steel backing plate, and the steel backing plate is used for anchoring the prestressed tendons.
Further, a steering plate is arranged in the LVL box girder and used for changing the direction of the prestressed tendons.
Further, the longitudinal direction of the LVL web is the wood grain direction, and the thickness of the LVL web is provided with a linearly-reduced area from the fulcrum to the center of the longitudinal direction. The shear strength of the composite beam along the longitudinal direction can accord with the distribution rule of the shearing force along the longitudinal direction.
Further, the single span range of the LVL-UHPC combined box girder structure is 20-40m.
Based on the same conception, the utility model also relates to a combined box girder bridge, which is characterized by comprising more than two LVL-UHPC combined box girder structures which are transversely arranged in parallel along the bridge, wherein cast-in-situ joints extending longitudinally along the bridge are arranged at the joints of UHPC bridge decks of two adjacent LVL-UHPC combined box girder structures, and the cast-in-situ joints are formed by casting ultra-high performance concrete in situ; the end parts of two adjacent LVL-UHPC combined box girder structures are connected through a wood diaphragm plate.
Compared with the traditional wood-concrete composite beam, the utility model has the following advantages: 1. the UHPC is adopted as the bridge deck, the bridge deck material has high strength and high toughness, higher crack resistance, reduces the self weight of the structure, and improves the economy and the crossing capacity of the combined box girder bridge; 2. the UHPC creep coefficient is small, so that the long-term deformation of the combined beam structure can be reduced; UHPC is impermeable to water, so that the durability of the combined structure can be greatly improved; 3. longitudinal prestressed tendons are arranged on the LVL box girder, so that the structural ductility of the box girder is greatly improved, and creep deformation of the box girder can be reduced; 4. the prefabricated combined box girder structure can be integrally prefabricated in a factory, and only a longitudinal cast-in-situ joint is required to be constructed on site, so that the influence of weather on construction can be reduced, and the construction quality is improved; the prefabricated combined box girder has lighter dead weight, thereby reducing the field working strength, improving the transportation and installation speed and shortening the construction period; 5. the LVL-UHPC combined box girder structure has light dead weight, good wood damping performance and excellent anti-seismic performance; 6. when the technology and the market are mature, the construction cost of the combined box girder bridge is lower, the combined box girder bridge has economy, and the combined box girder bridge meets the important requirement of green sustainable development of the bridge, and has important scientific significance and practical value.
In conclusion, the LVL-UHPC combined box girder bridge has excellent structural performance, light dead weight, large overall rigidity, strong spanning capability, high assembly degree, high transportation hoisting speed, small cast-in-place quantity, greatly reduced shrinkage creep of the top plate and good durability. The structure meets the requirements of green transformation development of bridge construction in China, is suitable for the construction of middle and small bridges, can be used for simply supported beams and continuous system bridges, and has wide application prospects in bridge engineering.
Drawings
FIG. 1 is an elevational view of a LVL-UHPC composite box girder construction;
FIG. 2 is a plan view of the LVL-UHPC composite box girder structure (top half is a top view and bottom half is a cross-sectional view);
FIG. 3 is a cross-sectional view of the fulcrum location of the LVL-UHPC composite box girder bridge;
fig. 4 is a mid-span cross-sectional view of the LVL-UHPC composite box girder bridge.
In the figure: 1-UHPC bridge deck, 2-LVL bottom plate, 3-LVL web, 4-LVL diaphragm, 5-steering plate, 6-shear member, 7-prestressing tendons, 8-steel backing plate, 9-cast-in-situ joint.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1-4, the LVL-UHPC composite box girder bridge of the present utility model comprises two LVL-UHPC composite box girder structures butted in the transverse direction of the bridge, the composite girder bridge adopts a multi-girder system, and comprises a prefabricated LVL-UHPC composite box girder structure, a cast-in-situ joint 9 and a wooden diaphragm plate (not shown); the LVL-UHPC combined box girder structure comprises an LVL box girder and a UHPC bridge deck 1 positioned above the LVL box girder, wherein the LVL box girder is provided with prestressed tendons 7, the prestressed tendons 7 are longitudinally arranged along a bridge and anchored on a steel backing plate 8 of a LVL diaphragm plate 4, the LVL web 3 is connected with the UHPC bridge deck 1 through a shear member 6, two adjacent LVL-UHPC combined box girder structures are butted at the UHPC bridge deck 1, and a cast-in-situ joint 9 is arranged at the butt joint position.
The top of the LVL web 3 is provided with a groove (not shown) at regular intervals along the longitudinal direction of the bridge, the shearing pieces 6 are implanted into the groove by screws, one part of the shearing pieces 6 is arranged in the LVL web, and the other part is arranged in the UHPC bridge deck 1, so that the LVL box girder and the UHPC bridge deck 1 are integrally combined.
The LVL diaphragm plates 4 are positioned at two ends of the LVL-UHPC combined box girder and are fixedly connected with the LVL bottom plate 2 and the LVL web plate 3 to form a whole, so that the transverse rigidity and the integrity of the LVL box girder are enhanced.
The thickness of the LVL web 3 is changed along the longitudinal direction of the bridge, and a linear reduced area is arranged from the fulcrum to the center of the longitudinal direction, so that the shearing strength of the composite beam along the longitudinal direction can accord with the distribution rule of shearing force along the longitudinal direction.
Meanwhile, a steel backing plate 8 is stuck at a corresponding position on the outer side of the end diaphragm plate 4 and used for dispersing strong pre-compression stress transmitted by the pre-stress tendons 7.
The longitudinal prestressed reinforcement 7 adopts steel strands, stretches longitudinally along the bridge, changes stretching direction through a steering plate 5 arranged in the LVL box girder, and is anchored on a steel backing plate 8 of the wood diaphragm plate 4.
The two adjacent prefabricated LVL-UHPC combined box girder structures are connected into a whole through cast-in-situ joints 9 and wooden diaphragms (not shown) at the ends, so that the integrity between the box girder structures can be improved.
In the embodiment, the longitudinal length of the LVL-UHPC combined box girder structure is 30m, and the transverse width is 8m.
The preparation method of the LVL-UHPC combined box girder mainly comprises the following steps:
1) Manufacturing a LVL web plate 3, connecting a LVL diaphragm plate 4 and a LVL bottom plate 2 into a whole structure, and reserving a pore canal (not shown) of a longitudinal prestressed rib 7 on the LVL diaphragm plate 4;
2) A groove is formed in the top of the LVL web plate 3, a shear member 6 is implanted into the groove by bolts, steel backing plates 8 are stuck to corresponding positions on two sides of the LVL diaphragm plate, longitudinal prestressed tendons 7 are made of steel strands, the longitudinal prestressed tendons 7 are tensioned and anchored on the steel backing plates 8 on the LVL diaphragm plate 4, the direction of the prestressed tendons 7 is changed by a steering plate 5, and then hole injection is carried out;
3) Installing a template and binding reinforcing steel bars on the UHPC bridge deck plate 1, pouring ultra-high performance concrete, curing the ultra-high performance concrete by high temperature steam after initial setting, and removing the template after curing meets the requirement, thus finishing the manufacturing of the LVL-UHPC combined box girder structure;
4) Hoisting prefabricated LVL-UHPC combined box girder structures, connecting two adjacent LVL-UHPC combined box girder structures into a whole through cast-in-situ joints 9 and end wood transverse baffles (not shown), arranging cast-in-situ joints 9 extending longitudinally along a bridge at the butt joint positions, arranging reinforcing steel bars in the cast-in-situ joints 9, binding, pouring ultra-high performance concrete, performing high-temperature steam curing after initial setting, and removing a mould after curing reaches the requirement; and finishing the construction of the prefabricated LVL-UHPC combined bridge structure.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, and the embodiments of the present utility model and the features of the embodiments may be combined with each other without conflict. The present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the utility model and the scope of the appended claims, which are all within the scope of the utility model.
Claims (8)
1. The LVL-UHPC combined box girder structure is characterized by comprising an LVL box girder and a UHPC bridge deck (1) positioned above the LVL box girder, wherein the LVL box girder comprises an LVL web plate (3), an LVL bottom plate (2) and an LVL diaphragm plate (4), the LVL web plate (3) and the LVL bottom plate (2) form a U-shaped structure, the LVL diaphragm plate (4) is arranged at two ends of the LVL bottom plate (2), and the LVL diaphragm plate (4) is fixedly connected with the LVL bottom plate (2) and the LVL web plate (3) at the same time; the LVL box girder further comprises prestressed tendons (7), and two ends of each prestressed tendon (7) are respectively anchored to the LVL transverse partition plates (4) at two ends of the LVL bottom plate (2).
2. LVL-UHPC composite box girder construction according to claim 1, characterized in that the top of the LVL web (3) is provided with a shear member (6), a part of the shear member (6) being located in the LVL web (3) and a part in the UHPC bridge deck (1).
3. A LVL-UHPC composite box girder construction according to claim 2, characterized in that the top of the LVL web (3) is provided with grooves spaced apart in the longitudinal direction, to which grooves the shear members (6) are fastened by screws.
4. The LVL-UHPC composite box girder structure according to claim 1, characterized in that the outer side surface of the LVL diaphragm plate (4) is provided with a steel backing plate (8), the steel backing plate (8) being used for anchoring the prestressing tendons (7).
5. The LVL-UHPC combined box girder structure according to claim 1, wherein a steering plate (5) is arranged in the LVL box girder, and the steering plate (5) is used for changing the direction of the prestress rib (7).
6. A LVL-UHPC composite box girder construction according to claim 1, characterized in that the longitudinal direction of the LVL web (3) is the grain-wise direction of wood, the thickness of which has a linearly decreasing area from the fulcrum point to the centre in the longitudinal direction.
7. The LVL-UHPC composite box girder structure of claim 1, wherein the LVL-UHPC composite box girder structure has a single span ranging from 20 to 40m.
8. A combined box girder bridge, which is characterized by comprising more than two LVL-UHPC combined box girder structures which are transversely arranged in parallel along a bridge, wherein cast-in-situ joints (9) extending longitudinally along the bridge are arranged at the splicing positions of UHPC bridge decks (1) of two adjacent LVL-UHPC combined box girder structures, and the cast-in-situ joints (9) are formed by casting ultra-high performance concrete in a cast-in-situ manner; the end parts of two adjacent LVL-UHPC combined box girder structures are connected through a wood diaphragm plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320261517.0U CN219710043U (en) | 2023-02-20 | 2023-02-20 | LVL-UHPC combined box girder structure and combined box girder bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320261517.0U CN219710043U (en) | 2023-02-20 | 2023-02-20 | LVL-UHPC combined box girder structure and combined box girder bridge |
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| Publication Number | Publication Date |
|---|---|
| CN219710043U true CN219710043U (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320261517.0U Active CN219710043U (en) | 2023-02-20 | 2023-02-20 | LVL-UHPC combined box girder structure and combined box girder bridge |
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| CN (1) | CN219710043U (en) |
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- 2023-02-20 CN CN202320261517.0U patent/CN219710043U/en active Active
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