CN109235222B - Light full-assembly type large cantilever ultrahigh-performance concrete finned beam and construction method thereof - Google Patents
Light full-assembly type large cantilever ultrahigh-performance concrete finned beam and construction method thereof Download PDFInfo
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- CN109235222B CN109235222B CN201811209740.0A CN201811209740A CN109235222B CN 109235222 B CN109235222 B CN 109235222B CN 201811209740 A CN201811209740 A CN 201811209740A CN 109235222 B CN109235222 B CN 109235222B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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Abstract
The light fully-assembled large cantilever ultra-high performance concrete wing spreading beam comprises a trough beam, a tooth-shaped variable cross-section cantilever beam and a corrugated rib bridge deck, wherein the trough beam, the tooth-shaped variable cross-section cantilever beam and the corrugated rib bridge deck are ultra-high performance concrete prefabricated components, a splicing groove connected with the tooth-shaped variable cross-section cantilever beam is formed in the outer side surface of the top of a web plate of the trough beam, and a diaphragm beam is arranged on the inner side surface of the web plate opposite to the splicing groove; the top of the diaphragm beam and the top of the tooth-shaped variable cross-section cantilever beam are tooth-shaped, and anchor bolts for splicing with the bridge deck are pre-embedded; the corrugated rib bridge deck is formed by splicing a plurality of prefabricated bridge deck plates, the corrugated ribs at the bottom of the prefabricated bridge deck plates are matched with the grooves at the tops of the groove beams and the tooth-shaped variable cross-section cantilever beams, and bolt holes are reserved; and ultrahigh-performance concrete is poured at the splicing positions of the splicing grooves and the prefabricated bridge deck slab to form wet joints. The invention also discloses a construction method of the spread-fin beam. The spread-wing beam has the advantages of attractive appearance, lightness, excellent stretching and stress performance, durability of more than 200 years and simple construction.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a light full-assembly type large cantilever ultrahigh-performance concrete finned beam.
Background
At present, most bridges in China are constructed in a cast-in-place mode, and the cast-in-place mode has the advantages of no need of large-scale hoisting equipment, stable and reliable construction, good bridge integrity and the like, but the cast-in-place construction has long construction period, complex construction management and great influence on the surrounding environment, and compared with the cast-in-place construction, the prefabricated component has the advantages of short construction time, good quality of prefabricated components, environmental protection, energy conservation and the like. However, the transportation and installation of the prefabricated parts during the prefabricated installation are often difficult, the requirements for transportation equipment and hoisting equipment are high, and the cost is increased. It follows that a lightweight fully fabricated construction is highly desirable in prefabricated installation.
The light prefabricated part can be realized by adopting novel materials, reasonably designed structural forms and other methods. The Ultra High Performance Concrete (UHPC) is far stronger than common Concrete in mechanical property and durability, the weight of the UHPC structure is only 1/2 of a reinforced Concrete structure under the same bending resistance, the thickness of the structure can be reduced by applying the UHPC to a bridge structure, the dead weight of the structure is greatly reduced, and the prefabricated part is lighter. In addition, the upper structure of the bridge is divided into a plurality of parts to be prefabricated respectively, and then all the parts are assembled, so that the difficulty of transportation and hoisting can be reduced, and the processes of manufacturing and removing the die are simplified. When the components are prefabricated in this way, the splicing of the components is of great importance and must be reasonably reliable.
The invention provides a light fully-assembled large cantilever UHPC (ultra high performance concrete) finned beam, which aims to meet the basic construction development requirements of China, start from the defects of cast-in-place and prefabricated installation, shorten the construction period, improve the structure quality, reduce the structure dead weight, reduce the transportation and hoisting cost and the like. The invention has the advantages of good structure quality, reliable splicing, good stress performance and durability, convenient construction, greatly shortened construction period, beautiful appearance and saved space under the bridge, and is very suitable for the requirement of construction development.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, and the light-duty fully-assembled large cantilever ultra-high performance concrete wing spreading beam which is simple in structure, easy to assemble and good in integrity after splicing is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the light fully-assembled large cantilever ultra-high performance concrete wing spreading beam comprises a trough beam, a tooth-shaped variable cross-section cantilever beam and a corrugated rib bridge deck, wherein the trough beam, the tooth-shaped variable cross-section cantilever beam and the corrugated rib bridge deck are ultra-high performance concrete (UHPC) prefabricated components, a splicing groove connected with the tooth-shaped variable cross-section cantilever beam is arranged on the outer side surface of the top of a web plate of the trough beam, and a diaphragm beam is arranged on the inner side surface of the web plate opposite to the splicing groove; the top of the transverse beam is toothed, and an anchoring bolt for splicing with the bridge deck is embedded; the beam top of the tooth-shaped variable cross-section cantilever beam is in a tooth shape, and an anchoring bolt for splicing with a bridge deck is embedded; the corrugated rib bridge deck is formed by splicing a plurality of prefabricated bridge decks, the corrugated ribs at the bottom of the corrugated rib bridge deck are matched with the teeth at the tops of the trough beam and the tooth-shaped variable cross-section cantilever beam, and bolt holes are reserved at the positions corresponding to the pre-embedded anchoring bolts of the trough beam and the tooth-shaped variable cross-section cantilever beam; and after the anchor bolt is installed in the bolt hole, ultra-high performance concrete (UHPC) grouting material is poured, and the ultra-high performance concrete (UHPC) is poured at the splicing part of the splicing groove and the prefabricated bridge deck slab to form a wet joint.
Two concave surfaces of the splicing groove in the longitudinal bridge direction on the channel beam are provided with channel beam overhanging steel bars, and connecting bolts for splicing with the tooth-shaped variable cross-section cantilever beams are embedded in the concave surfaces in the transverse bridge direction.
And the end surface of the splicing part of the trough beam and the tooth-shaped variable cross-section cantilever beam along the transverse bridge direction is provided with a prestressed hole for paving a transverse prestressed reinforcement.
The size of the cross section of the tooth-shaped variable-section cantilever beam is gradually reduced towards the direction far away from the trough beam.
L-shaped angle steel is arranged on two sides of the splicing part of the root part of the tooth-shaped variable cross-section cantilever beam, and the cantilever beam extending outwards along the longitudinal bridge penetrates through the steel plate and is welded with the steel plate.
The construction method of the light fully-assembled large cantilever ultrahigh-performance concrete finned beam comprises the following steps:
1) factory prefabricated parts: prefabricating the channel beam, the tooth-shaped variable cross-section cantilever beam and the prefabricated bridge deck in a factory;
2) installing a channel beam, after the channel beam is installed in place, hoisting the tooth-shaped variable cross-section cantilever beam to a splicing groove for splicing the tooth-shaped variable cross-section cantilever beam, and penetrating a connecting bolt at the splicing position through a steel plate hole and screwing down the connecting bolt; overlapping the overhanging steel bars of the channel beam and the overhanging steel bars of the outriggers, pouring UHPC to fill the splicing grooves, and stretching the transverse prestressed steel bars of the tooth-shaped variable cross-section outriggers after the wet joint reaches the strength required by the design;
3) after the tooth-shaped variable cross-section cantilever beams are spliced, prefabricated bridge deck plates are installed in blocks, the anchor bolts and the bolt holes are aligned, then UHPC grouting materials are used for filling the bolt holes, the anchor bolts among the bridge deck plates, the trough beams and the tooth-shaped variable cross-section cantilever beams are screwed down, and UHPC wet joints of the bridge deck plates are poured.
The light-duty full-fabricated large cantilever ultrahigh-performance concrete finned beam has the beneficial effects that:
the whole wing spreading beam is attractive in appearance, light and flexible, the channel beam, the tooth-shaped variable cross-section cantilever beam and the corrugated rib bridge deck are made of UHPC prefabricated components, each component can be made to be light and thin due to the adoption of the UHPC, and the compressive strength, the tensile strength, the toughness and the durability of the UHPC are far greater than those of common concrete and high-performance concrete, so that the whole wing spreading beam is excellent in stress performance and the durability can be more than 200 years.
The variable cross-section tooth-shaped cantilever beam of the large cantilever can effectively increase the clearance under the bridge, effectively reduce the dead weight of the upper structure, reduce the engineering quantity of the lower structure, reduce the size of the lower structure, greatly save the space under the bridge, and have the advantages in construction, so that the variable cross-section tooth-shaped cantilever beam can meet the development requirement of infrastructure construction, has strong applicability, and can be widely applied to various bridges.
The wave-shaped ribs at the bottom of the wave-shaped rib bridge deck are matched with the teeth at the top of the diaphragm beam and the top of the tooth-shaped variable cross-section cantilever beam in the trough beam, so that the contact area of the wave-shaped rib bridge deck with the trough beam and the tooth-shaped variable cross-section cantilever beam is increased, the connection strength of the wave-shaped rib bridge deck with the trough beam and the tooth-shaped variable cross-section cantilever beam is enhanced through the anchoring bolts, and the integral stress performance and stability of the spread-wing beam.
The splicing structure of the trough beam and the tooth-shaped variable-cross-section cantilever beam is simple and reliable in design, reliability of the splicing position of the trough beam and the tooth-shaped variable-cross-section cantilever beam is enhanced by adopting the transverse prestressed steel bars and the angle steel splicing plates, combining the embedded bolts, the lap steel bars and the UHPC wet joint poured after splicing, and splicing and construction of prefabricated parts are facilitated.
The light fully-assembled large cantilever UHPC finned beam is convenient and quick to construct, the structure is divided into a plurality of parts such as a channel beam, a tooth-shaped variable cross-section cantilever beam, a corrugated rib bridge deck and the like to be prefabricated, transported and installed respectively, the requirements on transportation and hoisting equipment are reduced while the quality is ensured, the transportation and hoisting pressure is greatly reduced, only a small amount of wet joints need to be poured on a construction site, the assembling process is convenient, and the construction period can be greatly shortened.
The construction method of the light-duty full-assembly type large cantilever ultrahigh-performance concrete finned beam has the beneficial effects that:
compared with in-situ casting, the construction method has the advantages of shorter construction time, higher construction quality, safer construction site, more environmental protection and energy conservation, and better building quality; compared with integral prefabrication, the prefabricated part has simpler transportation and installation, safer construction process and no need of large-scale hoisting equipment.
Drawings
FIG. 1 is a schematic structural diagram of a lightweight fully-assembled large cantilever ultra-high performance concrete finned concrete beam;
FIG. 2 is a schematic transverse cross-sectional view of the spreader bar of FIG. 1;
FIG. 3 is a perspective view of the UHPC trough beam of FIG. 1;
FIG. 4 is a perspective view of the UHPC cantilever beam with a deformed tooth cross section shown in FIG. 1;
FIG. 5 is a perspective view of the corrugated rib UHPC bridge deck of FIG. 1;
FIG. 6 is a schematic perspective enlarged view of a junction between a UHPC trough beam and a tooth-shaped variable cross-section UHPC cantilever beam;
FIG. 7 is a schematic front view of a splice between a UHPC trough beam and a tooth-shaped variable cross-section UHPC cantilever beam;
FIG. 8 is a schematic side view of a splice between a UHPC trough beam and a tooth-shaped variable cross-section UHPC outrigger;
FIG. 9 is a schematic top view of a UHPC trough beam spliced with a tooth-shaped variable cross-section UHPC cantilever beam;
fig. 10-is an enlarged schematic view of a corrugated rib UHPC bridge deck and a tooth-shaped variable cross-section UHPC cantilever beam bolt anchorage position.
In the figure: 1-channel beam, 2-tooth-shaped variable cross-section outrigger, 3-corrugated rib bridge deck slab, 4-diaphragm beam, 5-splicing groove, 6-outrigger splicing UHPC wet joint, 7-transverse prestressed steel bar, 8-anchor bolt, 9-bridge deck slab UHPC wet joint, 10-outrigger overhanging steel bar, 11-channel beam overhanging steel bar, 12-steel bar lap joint, 13-connecting bolt, 14-prestressed hole, 15-L-shaped angle steel, 16-bolt hole, and 17-UHPC grouting material.
Detailed Description
The invention is further explained with reference to the drawings and the embodiments.
Examples
Referring to FIGS. 1 to 10: the light fully-assembled large cantilever ultra-high performance concrete wing spreading beam comprises a trough beam 1, a tooth-shaped variable cross-section cantilever beam 2 and a corrugated rib bridge deck 3, wherein the trough beam 1, the tooth-shaped variable cross-section cantilever beam 2 and the corrugated rib bridge deck 3 are ultra-high performance concrete (UHPC) prefabricated components, a splicing groove 5 connected with the tooth-shaped variable cross-section cantilever beam 2 is arranged on the outer side surface of the top of a web plate of the trough beam 1, and a diaphragm beam 4 is arranged on the inner side surface of the web plate opposite to the splicing groove 5; the top of the transverse beam 4 is in a tooth shape, and an anchoring bolt 8 for splicing with a bridge deck is embedded; the beam top of the tooth-shaped variable cross-section cantilever beam 2 is in a tooth shape, and an anchoring bolt 8 for splicing with a bridge deck is embedded; the corrugated rib bridge deck 3 is formed by splicing a plurality of prefabricated bridge decks, the corrugated ribs at the bottom of the corrugated rib bridge deck are matched with the teeth at the tops of the trough beam 1 and the tooth-shaped variable cross-section cantilever beam 2, and bolt holes 16 are reserved at the positions corresponding to the embedded anchor bolts 8 of the trough beam 1 and the tooth-shaped variable cross-section cantilever beam 2; and after the anchor bolts 8 are installed in the bolt holes 16, ultra-high performance concrete (UHPC) grouting material is poured, and ultra-high performance concrete (UHPC) is poured at the splicing grooves 5 and the splicing positions of the prefabricated bridge deck slab to form cantilever beam splicing UHPC wet joints 6 and bridge deck slab UHPC wet joints 9.
Two concave surfaces of the splicing groove 5 on the channel beam 1 along the longitudinal bridge direction are provided with channel beam external extending steel bars 11, and connecting bolts 13 for splicing with the tooth-shaped variable cross-section cantilever beams 2 are pre-embedded on the concave surfaces along the transverse bridge direction.
And the end surface of the splicing part of the trough beam 1 and the tooth-shaped variable cross-section cantilever beam 2 along the transverse bridge direction is provided with a prestressed hole 14 for paving a transverse prestressed reinforcement 7.
The size of the cross section of the tooth deformation section cantilever beam 2 is gradually reduced towards the direction far away from the trough beam 1.
L-shaped angle steel 15 is arranged on two sides of the splicing part of the root part of the outrigger 2 with the tooth-shaped variable cross section, and the outrigger extending outwards along the longitudinal bridge extends outwards and penetrates through the steel plate and is welded with the steel plate.
The channel beam 1, the tooth-shaped variable cross-section cantilever beam 2 and the corrugated rib bridge deck 3 adopt UHPC prefabricated components, and because of the adoption of the UHPC, each component can be made to be lighter and thinner, and the whole wing spreading beam is attractive in appearance, light and handy and spread; because the compressive strength, the tensile strength and the toughness of the UHPC are far greater than those of common concrete and high-performance concrete, the whole wing spreading beam has excellent stress performance and the durability can reach more than 200 years.
The variable cross-section tooth-shaped cantilever beam of the large cantilever can effectively increase the clearance under the bridge, effectively reduce the dead weight of the upper structure, reduce the engineering quantity of the lower structure, reduce the size of the lower structure, greatly save the space under the bridge, and have the advantages in construction, so that the variable cross-section tooth-shaped cantilever beam can meet the development requirement of infrastructure construction, has strong applicability, and can be widely applied to various bridges.
The wave-shaped ribs at the bottom of the wave-shaped rib bridge deck 3 are matched with the top of the diaphragm beam 4 in the channel beam 1 and the teeth at the top of the tooth-shaped variable cross-section cantilever beam 2, so that the contact area of the wave-shaped rib bridge deck 3 with the channel beam 1 and the tooth-shaped variable cross-section cantilever beam 2 is increased, the connection strength of the wave-shaped rib bridge deck 3 with the channel beam 1 and the tooth-shaped variable cross-section cantilever beam 2 is enhanced through the anchor bolts 8, and the overall compressive strength, tensile strength, toughness and stability of the.
The splicing structure of the trough beam 1 and the tooth-shaped variable cross-section cantilever beam 2 is simple and reliable in design, the stress strength of the splicing part of the trough beam 1 and the tooth-shaped variable cross-section cantilever beam 2 is enhanced by adopting the transverse prestressed steel bars 7, the angle steel splicing plates, the embedded bolts, the lap steel bars and the UHPC wet joint poured after splicing, and splicing and construction of prefabricated parts are facilitated.
The construction method of the light fully-assembled large cantilever ultrahigh-performance concrete finned beam comprises the following steps:
1) factory prefabricated parts: prefabricating prefabricated parts such as a channel beam 1, a tooth-shaped variable cross-section cantilever beam 2, a prefabricated bridge deck and the like in a factory for later use;
2) installing a channel beam 1, after the channel beam 1 is installed in place, hoisting a tooth-shaped variable cross-section cantilever beam 2 to a splicing groove 5 to splice the tooth-shaped variable cross-section cantilever beam 2, and penetrating and screwing a connecting bolt 13 at the splicing position through a steel plate hole; overlapping the grooved beam overhanging steel bars 11 and the cantilever beam overhanging steel bars 10 (forming a steel bar overlapping part 12 as shown in figure 7), pouring UHPC to fill the splicing groove 5, and stretching the transverse prestressed steel bars 7 in the tooth-shaped variable cross-section cantilever beam 2 after the cantilever beam splicing UHPC wet joint 6 reaches the strength required by the design;
3) after the tooth-shaped variable cross-section cantilever beams 2 are spliced, prefabricated bridge deck plates are installed in blocks, the anchor bolts 8 and the bolt holes 16 are aligned, then UHPC grouting materials 17 are used for filling the bolt holes 16, the anchor bolts 8 between the bridge deck plates and the trough beams 1 and between the tooth-shaped variable cross-section cantilever beams 2 are screwed down, and UHPC wet joints 9 of the bridge deck plates are poured.
Claims (6)
1. A light-duty full-fabricated large cantilever ultra-high performance concrete wing spreading beam comprises a trough beam, a tooth-shaped variable cross-section cantilever beam and a corrugated rib bridge deck, wherein the trough beam, the tooth-shaped variable cross-section cantilever beam and the corrugated rib bridge deck are ultra-high performance concrete prefabricated components; the top of the transverse beam is toothed, and an anchoring bolt for splicing with the bridge deck is embedded; the beam top of the tooth-shaped variable cross-section cantilever beam is in a tooth shape, and an anchoring bolt for splicing with a bridge deck is embedded; the corrugated rib bridge deck is formed by splicing a plurality of prefabricated bridge deck plates, the corrugated ribs at the bottom of the prefabricated bridge deck plates are matched with the teeth at the tops of the trough beam and the tooth-shaped variable cross-section cantilever beam, and bolt holes are reserved at the positions corresponding to the anchoring bolts pre-embedded in the trough beam and the tooth-shaped variable cross-section cantilever beam; the bolt hole is poured with ultra-high performance concrete grouting material after the anchor bolt is installed, and ultra-high performance concrete is poured at the splicing part of the splicing groove and the prefabricated bridge deck slab to form a wet joint.
2. The light-duty full-fabricated large cantilever ultra-high performance concrete winged beam of claim 1, wherein the two concave surfaces of the splicing groove on the channel beam along the longitudinal bridge direction are provided with channel beam external reinforcing steel bars, and connecting bolts for splicing with the tooth-shaped variable cross-section cantilever beams are embedded in the concave surfaces along the transverse bridge direction.
3. The lightweight fully-assembled large cantilever ultra-high performance concrete finned beam as claimed in claim 1 or 2, wherein the end face of the splicing part of the trough beam and the tooth-shaped variable cross-section cantilever beam along the transverse bridge direction is provided with prestressed holes for laying transverse prestressed steel bars.
4. The lightweight fully-fabricated large cantilever ultrahigh-performance concrete finned beam as claimed in claim 1 or 2, wherein L-shaped angle steels are arranged on two sides of the splicing part of the root part of the outrigger with the tooth-shaped variable cross section, and outrigger steel bars extending outwards along the longitudinal bridge penetrate through and are welded with the steel plates.
5. The lightweight fully fabricated large cantilever ultra-high performance concrete spreader beam as recited in claim 1 or 2, wherein the cross-sectional size of the tine deformed section outrigger is gradually reduced in a direction away from the channel beam.
6. A construction method of the light-duty fully-assembled large cantilever ultra-high performance concrete finned beam as claimed in any one of claims 1 to 5, comprising the following steps:
1) factory prefabricated parts: prefabricating the channel beam, the tooth-shaped variable cross-section cantilever beam and the prefabricated bridge deck in a factory;
2) installing a channel beam, after the channel beam is installed in place, hoisting the tooth-shaped variable cross-section cantilever beam to a splicing groove for splicing the tooth-shaped variable cross-section cantilever beam, and penetrating a connecting bolt at the splicing position through a steel plate hole and screwing down the connecting bolt; overlapping the overhanging steel bars of the channel beam and the overhanging steel bars of the outriggers, pouring UHPC to fill the splicing grooves, and stretching the transverse prestressed steel bars of the tooth-shaped variable cross-section outriggers after the wet joint reaches the strength required by the design;
3) after the tooth-shaped variable cross-section cantilever beams are spliced, prefabricated bridge deck plates are installed in blocks, the anchor bolts and the bolt holes are aligned, then UHPC grouting materials are used for filling the bolt holes, the anchor bolts among the bridge deck plates, the trough beams and the tooth-shaped variable cross-section cantilever beams are screwed down, and UHPC wet joints of the bridge deck plates are poured.
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| CN201811209740.0A CN109235222B (en) | 2018-10-17 | 2018-10-17 | Light full-assembly type large cantilever ultrahigh-performance concrete finned beam and construction method thereof |
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| CN201811209740.0A CN109235222B (en) | 2018-10-17 | 2018-10-17 | Light full-assembly type large cantilever ultrahigh-performance concrete finned beam and construction method thereof |
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| CN109235222B true CN109235222B (en) | 2020-04-14 |
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| CN112593482B (en) * | 2020-12-04 | 2022-07-12 | 邹宇 | Prefabricated assembled concrete diaphragm structure and construction method |
| CN113481817A (en) * | 2021-08-12 | 2021-10-08 | 安徽省交通控股集团有限公司 | Construction method of bone type high-performance concrete segment assembled composite beam bridge |
| CN113789854B (en) * | 2021-09-03 | 2023-03-21 | 湖南大学 | Fully-assembled beam-column joint based on groove-type UHPC splicing component and manufacturing method thereof |
| CN114481842B (en) * | 2021-12-31 | 2023-12-08 | 安徽省公路桥梁工程有限公司 | Large cantilever steel backbone beam auxiliary splicing device and construction method thereof |
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