CN-224199788-U - Internal mold device for cast-in-situ hollow slab bridge

CN224199788UCN 224199788 UCN224199788 UCN 224199788UCN-224199788-U

Abstract

The utility model relates to an internal mold device for a cast-in-situ hollow slab bridge, which belongs to the technical field of bridge construction, and particularly comprises a multi-section interconnected tubular mold body arranged in a hollow slab bridge skeleton, wherein micro-groove grains are arranged on the outer surface of the tubular mold body, glass fiber mesh cloth is paved outside the tubular mold body, a gravity anchoring plate steel plate is arranged at the bottom of the tubular mold body, the gravity anchoring plate steel plate is fixed on the hollow slab bridge skeleton, the gravity anchoring plate steel plate is connected with the tubular mold body through bolts, U-shaped steel bars are further arranged at the upper part of the tubular mold body, the U-shaped steel bars are wrapped outside the tubular mold body, and the two sides of the U-shaped steel bars are fixedly connected with the bridge skeleton.

Inventors

WU XIN
XUE WEIJIE
WU HONGSHENG
ZHANG GUOCHUN
HOU ZHI

Assignees

太原市市政工程设计研究院

Dates

Publication Date: 20260505
Application Date: 20250527

Claims (4)

1. The internal mold device for the cast-in-situ hollow slab bridge is characterized by comprising a plurality of sections of mutually connected tubular mold bodies arranged in a hollow slab bridge skeleton, wherein micro-groove grains are arranged on the outer surface of each tubular mold body, glass fiber mesh cloth is paved outside each tubular mold body, a gravity anchoring plate steel plate is arranged at the bottom of each tubular mold body and is fixed on the hollow slab bridge skeleton, the gravity anchoring plate steel plate is connected with the tubular mold bodies through bolts, U-shaped steel bars are further arranged on the upper parts of the tubular mold bodies, the U-shaped steel bars are wrapped outside the tubular mold bodies, and two sides of each U-shaped steel bar are fixedly connected with the bridge skeleton.
2. The internal mold device for the cast-in-situ hollow slab bridge of claim 1, wherein the tubular mold body is made of plywood, and the surface of the plywood is coated with an impervious coating.
3. The internal mold device for the cast-in-situ hollow slab bridge of claim 1, wherein a plurality of annular reinforcing steel bars are further arranged in the tubular mold body.
4. The internal mold device for the cast-in-situ hollow slab bridge of claim 1, wherein the tubular mold bodies are connected through a mortise and tenon structure, and a wrapping prestressed nylon belt is wrapped at the connecting part of the tubular mold bodies, and the prestressed nylon belt is connected through a stainless steel buckle.

Description

Internal mold device for cast-in-situ hollow slab bridge Technical Field The utility model relates to an internal mold device for a cast-in-situ hollow slab bridge, and belongs to the technical field of bridge construction. Background When the limit beam heights such as flood control, clearance and landscapes are smaller in the bridge design, the dead weight can be effectively reduced by adopting the hollow plate beams, the span layout of the bridge is increased, and the landscapes and the economic performance of the bridge design are improved. The cast-in-situ hollow slab bridge internal mold usually adopts the structural forms of an air bag internal mold, a steel template, a plastic or composite material internal mold and the like. The hollow slab bridge has small height of the hollow section, so the construction operation difficulty is high, and the hollow slab bridge mostly adopts a permanent retention mode after the pouring of the internal mold is finished. Because the buoyancy is larger in the concrete pouring process, the problem of floating of the inner mold is more serious. The prior common internal mold structure mainly comprises an air sac internal mold, a steel template and a plastic or composite material internal mold. The air bag type internal mold adopts an air-filled rubber or high polymer material air bag, a cavity is formed after air filling, air is discharged after concrete is solidified, and the air bag type internal mold is light, flexible and low in cost, is easy to puncture by sharp objects and is easy to float, has high construction risk, needs to be matched with external support, has poor lateral pressure resistance of concrete, and is easy to float. The steel internal mold forms a cavity through bolts or welding assembled steel templates, has high rigidity and good stability, but has large weight, increases the load of the bridge structure, and is not beneficial to the stress safety of the structure. And the installation is long in time consumption, the labor cost is high, the adaptability to special-shaped sections (such as curve bridges and variable sections) is poor, the internal mold is permanently reserved, the internal mold can not be reused, and the cost is high. The plastic or composite material internal mold adopts polystyrene (EPS), PVC or glass fiber reinforced plastic for prefabrication molding, part after pouring can be recycled or permanently reserved, the plastic or composite material internal mold is light and corrosion-resistant, and can be designed in a customized way, but the plastic or composite material internal mold is disposable (such as EPS) to produce construction waste, has poor environmental protection, low bearing capacity, is easy to deform during concrete pouring, and has higher cost. Disclosure of utility model The utility model provides an internal mold device for a cast-in-situ hollow slab bridge, which aims to solve the technical problems in the prior art, has the advantages of simple structure, reasonable design, low construction difficulty and low cost, and is suitable for the construction of hollow slab bridges with smaller section heights. In order to achieve the above purpose, the technical scheme adopted by the utility model is that the internal mold device for the cast-in-situ hollow slab bridge comprises a plurality of sections of mutually connected tubular mold bodies arranged in a hollow slab bridge framework, micro-groove grains are arranged on the outer surfaces of the tubular mold bodies, glass fiber mesh cloth is paved outside the tubular mold bodies, gravity anchor plate steel plates are arranged at the bottoms of the tubular mold bodies and are fixed on the hollow slab bridge framework, the gravity anchor plate steel plates are connected with the tubular mold bodies through bolts, U-shaped steel bars are further arranged on the upper parts of the tubular mold bodies, the U-shaped steel bars are wrapped outside the tubular mold bodies, and two sides of the U-shaped steel bars are fixedly connected with the bridge framework. Preferably, the tubular die body is made of plywood, and the surface of the plywood is coated with an impervious coating. Preferably, a plurality of annular reinforcing steel bars are further installed in the tubular mold body. Preferably, the tubular die bodies are connected through a mortise and tenon structure, and the connecting part of the tubular die bodies is wrapped with a wrapped prestressed nylon belt, and the prestressed nylon belts are connected through stainless steel buckles. Compared with the prior art, the tubular die body manufactured by the plywood has the advantages of easiness in forming, light dead weight, cooperative stress with a main structure, small construction difficulty, great shortening of construction period, low construction cost, and effective solving of the defects of large construction risk, high cost, poor environmental friendliness and the like of the traditional air bag inner d