CN211522899U

CN211522899U - Long-span steel-concrete composite beam convenient to erect by bridge girder erection machine

Info

Publication number: CN211522899U
Application number: CN201921919614.4U
Authority: CN
Inventors: 杨晓光; 彭园; 张何; 侯兆隆; 朱丹丹
Original assignee: Road and Bridge International Co Ltd; China Communications Road and Bridge North China Engineering Co Ltd
Current assignee: Road and Bridge International Co Ltd; China Communications Road and Bridge North China Engineering Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-09-18
Anticipated expiration: 2029-11-07

Abstract

The utility model relates to a long span steel-concrete composite beam convenient to adopt bridging machine to erect, including steel box girder and decking, the decking sets up the polylith along the bridge direction, reserves the hole on each decking, is equipped with the framework of steel reinforcement in the decking, and the framework of steel reinforcement extends the decking both ends as the connecting rib along the bridge direction, is equipped with horizontal wet joint between two deck plates adjacent along the bridge direction, and welds through the connecting rib; a plurality of shear nail clusters are protruded in the reserved holes on each bridge deck plate on the flange plates on two sides of the steel box girder and are welded with the steel reinforcement framework of the bridge deck plate; concrete is poured into the transverse wet joints and the reserved holes of each bridge deck. The steel beam and the bridge deck are processed into a firm whole in advance, the common stress can be guaranteed to resist the downwarping of the steel-concrete composite beam after the steel beam and the bridge deck are mounted on a bridge, and a bridge erecting machine can be used for erecting the steel-concrete composite beam conveniently to improve the construction efficiency.

Description

Long-span steel-concrete composite beam convenient to erect by bridge girder erection machine

Technical Field

The utility model relates to a bridge construction technical field relates to a high mound long span steel-concrete composite beam who adopts the bridge girder erection machine to erect suitable for mountain area.

Background

The steel-concrete composite beam comprises a steel box beam, and a concrete bridge deck is laid on the top surface of the steel box beam. In the construction of the existing steel-concrete composite beam, the steel box beam is generally hoisted first, and then concrete is cast on the bridge floor in situ to be used as a bridge deck or a prefabricated bridge deck is directly paved. The steel box girder hoisting process is divided into subsection hoisting and whole span hoisting, the subsection hoisting equipment generally uses a bridge deck crane to hoist and connect a plurality of girder sections of each span of steel box girder in sequence, and the method has high construction safety risk and lower efficiency; the whole span hoisting method needs to arrange temporary buttresses in the span, erect floor supports and match with large ground hoisting equipment, is mostly applied to construction in plain areas, and in mountainous high-pier large-span bridges, the supports are difficult to erect and difficult to adopt due to the fact that the ground equipment cannot be unfolded.

The bridge girder erection machine is construction equipment capable of erecting a bridge in a whole span manner, has high construction efficiency, low construction cost and low requirement on ground environment, is commonly used for bridge construction in mountainous areas, but is generally only used for concrete prestressed T-beams/box beams at present. If the bridge girder erection machine is used for whole span hoisting of the large-span steel-concrete composite beam in the mountainous area, the following difficulties exist:

the steel-concrete composite beam is stressed by the steel box beam and the concrete bridge deck together, resists the downward deflection of the large-span beam body and has higher requirement on concrete creep. When the bridge girder erection machine is used for erection, as the temporary buttress is not arranged in the span, if the bridge deck slab is cast in place by adopting concrete, the age of the concrete is short, the creep is overlarge, the common stress capability with the steel box girder is poor, and the steel box girder is caused to be overlarge in downward deflection; if the prefabricated bridge deck slab is installed, the contact surface of the bridge deck slab and the steel box girder is difficult to effectively attach, the steel-mixed connection is difficult to control, the common stress performance of the steel box girder and the concrete bridge deck slab is also influenced, and the construction quality of the bridge cannot be ensured.

Disclosure of Invention

The utility model discloses an aim at adopts the bridge girder erection machine to erect the problem that meets to present mountain area large-span steel-concrete composite beam, improves the structure of steel-concrete composite beam, improves the firm in connection degree of steel case roof beam and decking, guarantees steel-thoughtlessly to connect the quality, makes it can be applicable to the hoisting of bridge girder erection machine, improves mountain area large-span steel-concrete composite beam's efficiency of construction.

The technical scheme of the utility model as follows:

the utility model provides a long span steel reinforced concrete composite beam convenient to adopt bridging machine to erect, includes the steel box girder, and the decking, its characterized in that are installed to steel box girder top surface: the bridge deck is formed by a plurality of rectangular concrete precast slabs arranged along the bridge direction, each bridge deck is provided with 4 preformed holes, a steel bar framework is arranged in each bridge deck, a horizontal bar of the steel bar framework of each bridge deck extends out of two ends of each bridge deck along the bridge direction to form a certain length as a connecting bar, and two bridge deck plates adjacent along the bridge direction are provided with certain intervals as transverse wet joints and are welded through the connecting bars; a plurality of shear nail clusters are arranged on the flange plates on the two sides of the steel box girder corresponding to the reserved holes on each bridge deck, protrude out of the reserved holes of the bridge deck and are welded with the steel bar framework of the bridge deck; concrete is poured into the transverse wet joints and the reserved holes of each bridge deck.

The utility model discloses connection structure to steel box girder and decking has optimized to be whole with the steel-concrete composite beam prefabrication in the back field, improved the steel-concrete connection quality, guaranteed the common atress performance of steel box girder and concrete decking, the deflection is in the allowed band down after making the steel-concrete composite beam bridge crane, therefore can adopt the bridging machine to erect, has improved the efficiency of construction, is favorable to the popularization and application of steel-concrete composite beam in the big span bridge of mountain area high mound.

Drawings

FIG. 1 is a cross-bridge elevation of the present invention;

FIG. 2 is a schematic plan view of a deck plate;

FIG. 3 is a schematic plan view of a steel box girder;

fig. 4 is a schematic plan view of the present invention.

Detailed Description

As shown in fig. 1 and fig. 4, the utility model discloses a steel box girder 1, deck plate 2 is installed to steel box girder top surface, and deck plate 2 is for following the bridge to the polylith rectangle concrete precast slab that sets up.

The structure of decking 2 is shown in fig. 1, fig. 2, fig. 4, is equipped with 4 preformed holes 21 on every decking 2, is equipped with framework of steel reinforcement 22 in the decking, and the framework of steel reinforcement 22's of every decking 2 horizontal muscle is followed the bridge and is extended certain length in the decking both ends as splice bar 23. On the steel box girder 1, a certain interval is arranged between two bridge decks 2 adjacent along the bridge direction to be used as a transverse wet joint 3, and connecting ribs 23 at the end parts of the two bridge decks 2 adjacent along the bridge direction are welded.

The structure of the steel box girder 1 is shown in fig. 1 and 3, a plurality of shear nail clusters 11 are arranged on flange plates at two sides of the steel box girder 1 corresponding to the preformed holes on each bridge deck, and the shear nail clusters 11 protrude into the preformed holes 21 of the bridge deck and are welded with the reinforcing steel frameworks 22 of the bridge deck in the preformed holes; concrete is poured into the transverse wet joints 3 and the prepared holes 21 of each deck slab.

The utility model discloses according to the wide needs of bridge, can be single case room or many case room structures. The embodiment shown in fig. 1, fig. 3 and fig. 4 is a three-chamber structure, and comprises 3 steel box girders 1 arranged in parallel, and the side walls of two adjacent steel box girders 1 are connected by bolts through cross beams 4.

The utility model discloses a manufacture process as follows:

the steel box girder and the bridge deck are respectively prefabricated in a centralized manner in the rear field and then assembled into a whole.

Each bridge deck slab is larger than the width of the steel box girder in the transverse bridge direction and has the length of 2m along the bridge direction. When prefabricating, a steel reinforcement framework is arranged in the bridge deck, and the bridge deck is prefabricated by adopting a template. 4 reserved grooves which are communicated up and down are arranged on the bridge deck corresponding to four corners, and a bridge deck steel bar framework is reserved in the reserved grooves; the bridge deck steel reinforcement framework reserves a certain length along the bridge to two ends to be used as a connecting rib.

The bridge deck is made of non-shrinkage concrete to offset the shrinkage and creep of the concrete. In order to guarantee the age of the bridge deck concrete, the bridge deck concrete is prefabricated and stored in a prefabricated yard 2-6 months in advance.

When the steel beam is prefabricated, a shear nail cluster is arranged at the position, corresponding to the reserved groove of the bridge deck, of the top surface, and the mounting position of the bridge deck is reserved on the periphery of the shear nail cluster.

When the bridge deck slab is installed, transverse wet joints are arranged between adjacent bridge deck slabs and are welded through connecting ribs. The shear nail cluster protrudes out of the reserved groove of the bridge deck and is welded with the reinforcing steel bar framework of the bridge deck in the reserved groove.

After the installation of the bridge deck slab is finished, non-shrinkage concrete of the same type as the bridge deck slab is adopted to pour the preformed groove and the transverse wet joint.

Through the process, the steel-concrete connection of the steel box girder and the bridge deck slab is completed, the steel-concrete composite girder is formed, and the steel-concrete connection quality can be guaranteed.

When the bridge is constructed, the whole span of the reinforced concrete composite beam can be hoisted in place by adopting a bridge girder erection machine, and the bridge deck and the steel box girder are connected into a firm whole in advance, so that the large-span beam body can be stressed and resisted to be downwarped jointly, and the construction quality and performance of the bridge are ensured.

Claims

1. The utility model provides a long span steel reinforced concrete composite beam convenient to adopt bridging machine to erect, includes the steel box girder, and the decking, its characterized in that are installed to steel box girder top surface: the bridge deck is formed by a plurality of rectangular concrete precast slabs arranged along the bridge direction, each bridge deck is provided with 4 preformed holes, a steel bar framework is arranged in each bridge deck, a horizontal bar of the steel bar framework of each bridge deck extends out of two ends of each bridge deck along the bridge direction to form a certain length as a connecting bar, and two bridge deck plates adjacent along the bridge direction are provided with certain intervals as transverse wet joints and are welded through the connecting bars; a plurality of shear nail clusters are arranged on the flange plates on the two sides of the steel box girder corresponding to the reserved holes on each bridge deck, protrude out of the reserved holes of the bridge deck and are welded with the steel bar framework of the bridge deck; concrete is poured into the transverse wet joints and the reserved holes of each bridge deck.

2. The long span steel-concrete composite beam convenient to erect by a bridge erecting machine according to claim 1, wherein: the steel box girder has 3, and bolted connection is used through the horizontal tie beam between two adjacent steel box girder lateral walls.