Exported to Africa Bridge Concrete Pneumatic Inflatable Rubber Airbag Balloon

Product Description

Product Description

Rubber Inflated Culvert Balloon for Hollow Slabs
    The rubber inflated culvert balloon, also known as the bridge inflatable core mold, is an expandable and contractible cylindrical bag made of rubber with a fiber-reinforced layer, featuring excellent tensile strength, elasticity, and air-tightness. It is primarily used to form cavities in concrete components.

    When manufacturing hollow components, the inflatable core mold is placed in the middle of the component and is expanded by injecting compressed air.      The inflated core mold can withstand the pressure of concrete, thus effectively replacing traditional wooden, bamboo, and steel molds. When in use, simply open the valve, and the airbag will deflate, making it easy to remove from the cavity.

Function

    *Forming Core: Inflates to form the pre-set cavities in concrete components, such as circular, oval, octagonal shapes, etc.
    *Supporting Concrete: Possesses sufficient strength after inflation to reliably support the lateral pressure and self-weight of fluid concrete during pouring, preventing deformation.
    *Easy Demolding: After the concrete initially sets, it deflates and contracts, reducing in volume, allowing it to be easily pulled out from the component, simplifying the demolding process.
    *Reusable: Designed for durability, under normal use and maintenance conditions, a single product can typically be reused multiple times (e.g., dozens to hundreds of times), offering significant economy.

Product Features

*High Pressure Resistance: Working pressure 0.04-0.06MPa, burst pressure ≥0.15MPa

*Excellent Air Tightness: Pressure drop <3kPa in 24-hour test

*Optimal Flexibility: Easy to fold and store with good rebound

*Puncture Resistance: Surface puncture strength ≥80N

*Temperature Adaptation: Normal use in -20℃ to +60℃ environments

Material

Main Rubber Material: Primarily uses Natural Rubber or high-quality blends of natural and synthetic rubber, ensuring high elasticity, excellent air tightness, and good durability-7-9.

Reinforcement Layer: Incorporates a high-strength fiber skeleton material, such as nylon cord or anti-stretch fabric, bonded to the rubber through a hot-press vulcanization process, giving the airbag high tensile strength and pressure resistance-7.

Manufacturing Process: Utilizes integral winding or seamless special anti-burst production processes, resulting in a smooth bag body that is wear-resistant, aging-resistant-9.

Cross-sectional shape of inflatable rubber culvert airbag

Specification

item	index
thickness tolerance, mm	3.2±2
shore A	65±5
adhesive strengh N/25MM	≥8
tensile strength, mpa	≥12
elongation at break %	≥350
300% constant elongation,mpa	6
stretching deformation rate	≤20%
suitable temperature,ºC	-10-+80
appearance	no crack, no bubble, impurity length≤3mm depth≤1.5mm and no more than one place each meter

Installation

Installation Precautions

—Position the mold precisely in the formwork before inflation.
—Inflate gradually to the rated working pressure — monitor with gauge.
—Anchor the mold against buoyancy from wet concrete.
—Ensure concrete is poured evenly on all sides — avoid displacement.
—Deflate fully before stripping — do not pull while pressurized.
—Store molds clean, dry, and away from sunlight and sharp objects.

Product Details

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Where It Is Used
—Culvert Construction — Forms box and pipe culvert voids in road works.
—Box Girder Bridges — Creates hollow cells in precast and cast-in-situ girders.
—Hollow Slabs — Round voids reduce dead weight in floor and bridge slabs.
—Precast Beams — Void cores for hollow prestressed concrete beams.
—Concrete Pipes — Continuous tubular molds for precast pipe production.

Packaging & Shipping

Company Profile

    Hengshui Jingtong Rubber Co., Ltd., located in Hebei Province's Hengshui City, is a professional manufacturer of engineering rubber products. Our product range includes bridge bearings, expansion joints, water stop strips, water stop belts, inflatable cores, building deformation joint device and water plugs, which are widely used in bridge, tunnel, water conservancy, and power engineering projects. The company boasts advanced technology and mature processes to ensure reliable product quality.

    We have a professional technical team and a comprehensive after-sales service system to ensure customers receive high-cost-performance products and attentive service. Hengshui Jingtong Rubber Co., Ltd. is committed to continuous innovation to meet market demands and looks forward to esta  blishing long-term cooperative relationships with customers from both domestic and international markets.