Henan, China
Business Type:
Manufacturer/Factory, Trading Company
Registered Capital:
16000000 RMB
Plant Area:
>2000 square meters
Management System Certification:
ISO 9001
Average Lead Time:
Peak season lead time: one month
Off season lead time: within 15 workdays
OEM/ODM Service

Rubber Mandrel, Concrete Column Formwork, Rubber Airbag manufacturer / supplier in China, offering Pipe Rubber Mandrels for Culvert Construction, Automatic Wheat Maize Rice Flour Mill Flour Milling Machines, Wheat Flour Mill Machine Milling Machinery Plant Wheat Hammer Line and so on.

Diamond Member Since 2018
Audited Supplier
Supplier Homepage Products Other Equipments Pipe Rubber Mandrels for Culvert Construction

Pipe Rubber Mandrels for Culvert Construction

Get Latest Price
Min. Order / Reference FOB Price
1 piece US $160-1,650/ piece
Port: Qingdao, China
Production Capacity: 6000sets/Month
Payment Terms: L/C, T/T
Condition: New
Certification: ISO9001, ISO, CE
Usage: Tunnel, Bridge
Material: Natural Rubber
Transport Package: Wooden Package
Specification: 1-28m or as Your Request

You Might Also Like


Basic Info

Kaifeng, Henan, China
HS Code
Brief introduction to mandrel of pneumatic rubber
Mandrel of pneumatic rubber also refers to air case, capsule, etc. It is a kind of inflatable (air inflation) and shrinkable (air deflation) tape product. It can be made in various shapes according to user demands. When using it, it should be pulled into reinforcement cage with compressed air filled and concrete pouring should be carried out, and then compressed air can be released and mandrel of pneumatic rubber can be pulled out after initial set of concrete. In this way, beam slab will be of hollow form as needed.
Construction practice proves that not only materials can be saved, but also many shapes can be made by using prefabricated capsule parts. It can be made in round shape, oval, rectangle, octagon, trapezoid and variable cross-section form, which greatly reduces labour intensity of workers, increases efficiency and saves production cost. Therefore, it is widely used for highway, railway, water conservancy, dock and wharf.

Performance Features
Scientific and reasonable design.
Both rubber inflatable andrel and prefabricated or cast-in-place finished components can meet design requirements with features of easy operation and saving labour, time and materials.

Excellent ageing-resistant performance and long service life. .
The product is made of synthetic rubber, natural rubber and vulcanized reinforced layer, which provides the product with excellent anti-expansion strength, elasticity and flexibility, thus it is capable of meeting the application requirements of all kinds of working conditions.

Wide applicative temperature range
The material has no change under the temperature of -10ºC~+90ºC.

It provides strong conditions for light-weight trend of building site construction. .
For prestressed hollow concrete components, its weight is 30% lighter than non-prestressed solid components due to the application of rubber mandrel. Therefore, reducing the weight of upper structure of building can shorten pile foundation and increase span, which makes the on-site construction easy and safe.

Simple, safe and hygeian construction process.
Only a few simple tools rather than special processes are required when using rubber mandrel. Concrete can be poured only by putting mandrel into reinforcement cage when inflation pressure reaches working pressure. During initial set of concrete, mandrel can be deflated and taken out, so as to mould finished components without environmental pollution.

Schematic Diagram of Service Pressure

Circular diameter (mm)

Service air pressure (Mpa)

Whole oval (mm)
Service air pressure (Mpa)

Circular diameter (mm)

Service air pressure (Mpa)

Whole oval (mm)

Service air pressure (Mpa)

Octangle air case

Service air pressure (Mpa)

Pipe Rubber Mandrels for Culvert Construction

Application of Mandrel


Mandrel surface shall be uniformly coated with separant before putting into cage. Separant ratio: water : washing powder : talcum powder=10:1:2.
2. .
Pull mandrel into reinforcement cage with  concrete floor laid.

Air inflation
Open valve and inflate to specified pressure. Please be noted that valve joint shall be bound by teflon tape.

Mandrel may float during construction, thus it shall be provided with locating bar and pressing block shall be applied on it. Space between locating bars is generally 30-80mm according to mandrel specifications.

Concrete pouring
Process after pouring concrete is basically in conformity with that of solid components.
Simultaneously vibrating by using high-frequency plug-in vibrating rod from both sides can avoid mandrel movement.

Model removal
After initial set of concrete, vent valve shall be opened to vent air and take out mandrel (basis conditions for air venting and demoulding time and mixing ratio of concrete shall be determined by Constructor).
Pipe Rubber Mandrels for Culvert Construction


Send your message to this supplier

avatar Mr. Alex Song

Enter between 20 to 4,000 characters.

This is not what you are looking for? Post a Sourcing Request Now

People who viewed this also viewed