Molded bags: the versatile masters of innovative building materials

Release time:

2024-10-28

As a new type of geosynthetic material, mold bag plays an important role in water conservancy engineering and other fields. It consists of high-strength chemical fiber filament woven into a double-layer bag fabric, on the upper and lower two layers along the longitudinal and transverse direction of every distance, there is a certain length of nylon rope, the two layers of fabrics linked together, and control the thickness of the injection molding, because of its role as a template, it is known as the mold bag. Foreign mold bag concrete slope was first seen in 1969 the completion of the Canadian Toronto channel test project. 1880s, Japan's Asahi Kasei Co., Ltd. according to the invention of the U.S. building technology companies with high-strength polyester 66-type cloth made of a variety of mold bags, also known as Fabric. China in recent years only in the water conservancy project to promote the use of geotextiles, molded bag concrete in the coastal dyke square, river slope bank protection project application is still just in its infancy. Mold bag basic type according to different filling materials can be divided into mortar type and concrete type. Mortar type mold bag can be divided into anti-filtration drainage point -EP type, no anti-filtration drainage point -NF type, hinged block type -RB type and box grid type -NB type; concrete mold bag is usually no drainage point -CX type. Because of the uniform section type concrete lining self-supporting ability, can be laid on the steep slope of 1:1, can increase the stability of the slope to prevent landslides. Often used for river embankment slope protection, channel, pond lining.

Types

(i) Types of molded bags
According to the different filling materials, the mold bag is divided into mortar type and coagulation type. Among them, according to its slope protection function and different structures, mortar type mold bag can be divided into anti-filtration drainage point -EP type, no anti-filtration drainage point -NF type, hinged block type -RB type and frame grid type -NB type. Concrete mold bag is usually no drainage point -CX type, with the characteristics of strong self-supporting capacity, suitable for laying on steep slopes, to enhance the stability of the slope anti-slip, to prevent landslides, widely used in river embankment slope protection, channels, pond lining and other projects. In addition, the mold bag can also be divided into factory production of woven mold bag and hand-sewn simple mold bag two categories. Woven mold bag is mainly made of polyamide, polyester, etc., with a uniform aperture, high strength, filled with slurry does not leak, etc., can be filled with materials; simple mold bag is mainly used for slope protection projects.
(B) the characteristics of the mold bag
Construction using a spray irrigation molding, simple and fast. For example, in ningbo mold bag concrete construction unit to provide the river mold bag slope protection project, the construction of high degree of mechanization, greatly shorten the construction time, increase the construction progress.
With a certain degree of water permeability, it can reduce the water-cement ratio, accelerate the solidification and increase the compressive strength. After the concrete or cement mortar is filled into the mold bag, the excess water seeps out through the fabric voids, which can rapidly reduce the water-cement ratio, accelerate the solidification of concrete and increase the compressive strength of concrete.
Adapt to all kinds of complex terrain, can be constructed underwater, large area of slope protection surface, strong integrity, good stability, long service life. When underwater molded concrete slope protection is carried out at the bottom of the river with large flow velocity, the molded concrete can adapt to the complex terrain, and can be directly constructed underwater without filling cofferdams. Such as Ningbo molded concrete construction unit to provide high-strength woven mold bag, in the construction process to ensure that the molded concrete can be molded close to the ground, suitable for complex terrain.
High strength, strong frost resistance, can be prefabricated into different shapes. Molded bag high strength, strong frost resistance (can withstand - 40 degrees low temperature), according to the project requirements can be prefabricated into different sizes, different thicknesses of a variety of geometric shapes. For example, one of the characteristics of geotechnical mold bag in slope protection construction is high strength and strong frost resistance, which can meet the needs of different projects.

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