CN116219867A

CN116219867A - Combined beam bridge and construction process thereof

Info

Publication number: CN116219867A
Application number: CN202310233269.3A
Authority: CN
Inventors: 常付平; 邵长宇; 李文勃; 王倩; 张春雷
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-06-06

Abstract

The invention provides a combined beam bridge and a construction process thereof, and relates to the technical field of bridge engineering. The composite girder bridge comprises: the girder comprises a plurality of foundations and piers, and is erected on the piers, wherein the girders are steel concrete composite girders, and the composite girders consist of transverse full-width integral precast prestressed concrete bridge decks and stiffening rib-free steel girders. After the construction process of the pier foundation is finished, the steel beam is firstly implemented through a hoisting or pushing process, then the precast concrete bridge deck is hoisted, high-strength mortar is poured between the bridge deck and the steel beam, and then transverse wet joint pouring is carried out. The invention is suitable for rapid prefabrication and assembly construction.

Description

Combined beam bridge and construction process thereof

Technical Field

The invention belongs to the technical field of bridge engineering, and relates to a combined beam bridge and a construction process thereof.

Background

The combined beam bridge can fully exert the mechanical properties of two materials of steel and concrete, and can solve the problems of easy fatigue and poor durability of a steel bridge deck system; meanwhile, the combined beam bridge adopts a prefabrication assembly technology, so that the site construction progress can be accelerated, the site construction pollution can be reduced, and the realization of a double-carbon target can be promoted; moreover, the combined beam bridge has low economical efficiency and can save a great deal of social resources. Therefore, the composite girder bridge is increasingly favored by constructors in the construction of infrastructure in China in recent years. The traditional combined beam bridge deck 104 adopts block prefabrication, has a plurality of on-site wet joint interfaces, and is difficult to ensure the construction quality; another type of transverse full width integral prefabrication requires the reservation of larger rectangular group nail holes 211, which have poor interface durability and may even lead to weakened sections. In addition, the steel beam 103 of the traditional composite beam has more stiffening ribs, so that the on-site and later-period operation maintenance workload is greatly increased, and the durability of the structure is also greatly adversely affected. For this reason, a new type of composite girder bridge is required.

Disclosure of Invention

The invention aims to solve the main problems of durability, quality and section weakening of wet joints or group nail hole interfaces in the prior art, and provides a combined beam bridge and a construction process thereof.

The invention solves the technical problems by the following technical scheme:

a composite beam bridge comprises a foundation, a pier and a steel concrete composite beam. The composite beam bridge deck adopts a transverse full-width precast concrete slab, the precast slab is provided with a longitudinal through length reserved groove, and high-strength mortar is poured through a reserved pouring hole to be connected with the steel beam.

The combination Liang Gangliang adopts at least two steel longitudinal beams without longitudinal and transverse stiffening ribs, steel cross beams are arranged between the steel longitudinal beams at intervals of about 6m, and the steel cross beams are not connected with the concrete bridge deck.

The prefabricated bridge deck boards are transversely prestressed and are connected through steel bars and UHPC transverse seams.

And 1 grouting hole is formed in the middle of each longitudinal through length reserved groove of the combined beam bridge deck, and 2 grouting holes are formed in two ends of each longitudinal through length reserved groove.

The welding nails for connection between steel and concrete are long and short, and the welding nails in the grouting holes and the grout-raising holes are long nails and the welding nails in other positions are short nails.

The construction process of the composite girder bridge is characterized in that the composite girder bridge is the composite girder bridge, and comprises the following steps:

step 1, building two side piers, building a plurality of middle piers between the two side piers, and setting a plurality of temporary piers or not according to stress and process requirements.

And 2, processing the steel beam section in a factory, and installing the steel beam in place on site through a hoisting or pushing construction process.

And 3, prefabricating the concrete bridge deck, stretching and pre-stressing, storing for more than 6 months, and hoisting the concrete bridge deck after the steel beam is in place.

And 4, pouring high-strength mortar through the reserved holes, completing connection of the precast slabs and the steel beams, and then completing connection of the bridge deck slab transverse joints.

Preferably, in the step 4, high-strength mortar is poured from the grouting hole through a special device, and the grouting hole is plugged after the mortar flows out from the grouting hole.

Preferably, in step 4, the bridge deck slab transverse seam is cast across the middle section portion and then the pier top portion.

The invention has the positive progress effects that: the combined beam bridge adopts a novel concrete slab and steel beam connection technology, overcomes the problems of poor durability and weakened section of the group nail preformed holes, and enhances the structural stress performance; the prefabricated bridge decks are connected through UHPC transverse joints, so that the construction quality difficulty of a wet joint interface is reduced, and the structural durability is improved; the grouting holes are formed in the middle of the bridge deck through groove and are cast through a special device, the grouting holes are formed in the two ends of the bridge deck through groove, and the grouting holes are plugged after mortar flows out from the grouting holes, so that the compactness of the mortar casting is guaranteed; the bridge deck boards are transversely provided with prestress, so that the durability of the structure can be effectively improved; the bridge deck transverse seam is firstly constructed to span the middle section, and then the pier top section is constructed, so that the tensile stress of the pier top bridge deck can be greatly reduced, and the stress performance of the structure is improved.

Drawings

FIG. 1 is a schematic diagram of a conventional deck slab group nail hole structure;

FIG. 2 is a schematic cross-sectional view of a main beam of the present invention;

FIG. 3 is a schematic plan view of the deck slab of the present invention;

FIG. 4 is an elevational schematic of the deck slab of the present invention;

fig. 5 is a schematic view of an embodiment composite beam construction process.

Detailed Description

The novel composite beam and the construction process thereof provided by the invention are further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.

Referring to fig. 2 to 4, the present embodiment is a composite girder bridge comprising a foundation 101, a pier 102, and steel

concrete composite girders

103, 104, 105. The steel concrete composite beam bridge deck 104 adopts a transverse full-width precast concrete slab, the precast concrete slab is provided with a longitudinal through length reserved groove 201, and high-strength mortar 204 is poured through reserved holes 202 to be connected with the steel beam 103.

The steel beams 103 and 105 adopt at least two steel stringers 103 without longitudinal and transverse stiffening ribs, a steel beam 105 is arranged between the steel stringers at intervals of about 6m, and the steel beam 105 is not connected with the concrete bridge deck 104.

The prefabricated bridge decks are provided with transverse prestress 303, and the prefabricated bridge decks are connected by UHPC transverse slits 207.

Each longitudinal through length reserved groove 201 of the combined beam bridge deck 104 is provided with 1 grouting hole 205 in the middle, and two ends of each longitudinal through length reserved groove are provided with 2 grouting holes 206.

The welding nails for connection between the steel and the concrete are long and short, wherein the welding nails in the grouting holes 205 and the grouting holes 206 are long nails 301, and the welding nails at other positions are short nails 302.

As shown in the figure, the construction process of the composite girder bridge comprises the following steps:

step 1, two side piers 1021 are built, a plurality of middle piers 1022 are built between the two side piers, and a plurality of temporary piers or no temporary piers are arranged according to stress and process requirements.

And 2, processing the steel beam section in a factory, and installing the steel beam 103 in place on site through a hoisting or pushing construction process.

And 3, stretching the precast concrete deck 104, storing for more than 6 months, and hoisting the precast concrete deck after the steel beam is in place.

And 4, pouring high-strength mortar 204 through the reserved holes, completing the connection of the precast slabs 104 and the steel beams 103, and then completing the connection of the bridge deck transverse joints 207.

In the construction process step 4, the high-strength mortar 204 is poured from the grouting hole 206 through a special device, and the grouting hole is plugged after the mortar flows out from the grouting hole 206. In addition, in step 4, the bridge deck slab transverse seam is cast across the middle section 1041 portion and then the pier top section 1042 portion.

The combined beam bridge adopts a novel concrete slab and steel concrete combined beam connection technology, overcomes the problems of poor durability of group nail preformed holes and weakening of cross sections, and enhances the stress performance of the structure; the prefabricated bridge decks are connected through UHPC transverse joints, so that the construction quality difficulty of a wet joint interface is reduced, and the structural durability is improved; the bridge deck boards are transversely provided with prestress, so that the durability of the structure can be effectively improved; the bridge deck transverse seam is firstly constructed to span the middle section, and then the pier top section is constructed, so that the tensile stress of the pier top bridge deck can be greatly reduced, and the stress performance of the structure is improved.

The key point of the invention is that the high-strength mortar cast by combining steel and concrete cannot guarantee the compactness of the high-strength mortar in the longitudinal through groove if the conventional method is adopted, and the expected purpose cannot be achieved. In order to overcome the problem, the invention sets the pouring hole in the middle of the through groove, and pours through the special device, sets the slurry-overflowing hole at both ends, and plugs the slurry-overflowing hole after the slurry-overflowing hole has the slurry to flow out, so that the high-strength slurry compactness is ensured.

The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims

1. The utility model provides a combination beam bridge, includes basis, pier and steel concrete composite beam, its characterized in that, combination beam bridge includes the panel, and the panel adopts horizontal full width whole precast concrete board, and the longitudinal through long reservation groove is established to the precast slab, through reserving slip casting hole pouring high strength mortar and girder steel and be connected.

2. The composite girder bridge of claim 1, wherein the steel concrete composite girder comprises at least two steel stringers without longitudinal and transverse stiffening ribs, steel cross beams are arranged between the steel stringers at equal intervals, and the steel cross beams are not connected with the concrete bridge deck.

3. A composite girder bridge according to claim 1, wherein steel strands are arranged in the prefabricated bridge deck as transverse prestress, and the prefabricated bridge deck is connected by steel bars and UHPC transverse seams.

4. The composite girder bridge according to claim 1, wherein 1 or more grouting holes are formed in the middle of a longitudinal through length reserved groove of each prefabricated bridge deck of the composite girder, and 2 or more grout outlet holes are formed in two ends of each longitudinal through length reserved groove.

5. The composite girder bridge of claim 1, wherein the connecting welding nails between the steel and the concrete are long and short, wherein the welding nails in the grouting holes and the grout-raising holes are long nails, and the welding nails at other positions are short nails.

6. A construction process of a composite girder bridge, characterized in that the construction process of the composite girder bridge according to any one of claims 1 to 5 comprises the steps of:

step 1, building two side piers, building a plurality of middle piers between the two side piers, and arranging a plurality of temporary piers according to stress and process requirements;

step 2, processing steel beam sections in factories, and installing steel beams in place on site through a hoisting or pushing construction process;

step 3, prefabricating the concrete bridge deck, stretching and tensioning the prestress, storing for more than 6 months, and hoisting the concrete bridge deck after the steel beam is in place;

and 4, pouring high-strength mortar through a reserved pouring hole, completing connection of the precast slab and the steel beam, and then completing connection of the bridge deck slab transverse seam.

7. The construction process according to claim 4, wherein in step 4, high-strength mortar is poured from the grouting hole through a special device, and the grouting hole is plugged after the mortar flows out from the grouting hole.

8. The construction process according to claim 4, wherein in step 4, the bridge deck slab transverse seam UHPC is poured first over the middle section and then over the pier top section.