WO2011017965A1

WO2011017965A1 - Application of polypropylene staple fiber needling geotextile to sliding layer and sliding layer

Info

Publication number: WO2011017965A1
Application number: PCT/CN2010/073555
Authority: WO
Inventors: 赵民忠; 邓洪
Original assignee: 肇庆俊富纤网材料有限公司
Priority date: 2009-08-14
Filing date: 2010-06-04
Publication date: 2011-02-17
Also published as: CN101644021A

Abstract

An application of a polypropylene staple fiber needling geotextile to a sliding layer and the sliding layer are provided. The sliding layer includes an upper polypropylene staple fiber needling geotextile layer (11), an intermediate sliding film (12) which can be a HDPE film and a lower polypropylene staple fiber needling geotextile layer (13). The polypropylene staple fiber needling geotextile is applicable to the sliding layer in a roadbed or a bridge.

Description

Application of polypropylene staple fiber needled geotextile on sliding layer and sliding layer thereof [Technical Field]

The invention relates to the field of building engineering, and in particular to a sliding layer application technique therein.

【Background technique】

The sliding layer is a new application technology; it is to provide a large-area sliding layer between the contact faces of different rigid structures of the building, to reduce the constraint on the ^ structure, and to reduce the temperature stress from 3⁄4.

The installation of the sliding layer is a new technology, a new process, and its application is not much, but this concept has been used in the national standard specification. In the construction project, the sliding layer should mainly be in the assembled structure, prestressed pavement structure, large The area of the entire board is based on the base plate and so on. Generally natural foundation. Large-area slab foundation is to use a linoleum as the main body, supplemented by a "sliding layer" of waterproof coating layer, and also a layer of sand-covered waterproof paper, sand and linoleum or sand and polyethylene. Thin as a sliding /.

For those skilled in the art, it is generally considered that:

The strength of polyester is greater than that of polypropylene: China's polyester production capacity is strong, technology and quality are basically in line with international standards, and polypropylene production technology is relatively backward. It is generally believed that the strength of polyester is greater than that of polypropylene.

The filament non-woven fabric is better than the staple fiber non-woven fabric in strength and uniformity: filament non-woven fabric

It has advantages in the product range of 70g/m ² or less, and the strength and uniformity are better than that of short-fiber nonwoven fabric.

The weather resistance of polyester is stronger than that of polypropylene: In general, polyester is only stronger than polypropylene, and polypropylene is treated with anti-UV to achieve long-term exposure. Therefore, those skilled in the art believe that the weather resistance of polyester is stronger than that of polyester. Polypropylene.

Therefore, polyester filaments are a more common choice for sliding houses. For example, in the Chinese patent application "Sliding Layer for Longitudinal Isolation Devices of Bridge Tracks", application No. 2007101 75541, 8, a sliding layer is disclosed. The structure includes an upper film layer, a middle sliding film and a lower film house. The material of the film layer is polyester length ii, PA 纡 or PU r dimension, and the sliding film is HDPE.

[Summary of the Invention]

The main object of the present invention is to provide a material application suitable for a sliding layer and a corresponding sliding layer structure.

To this end, the present invention provides an application of a polypropylene staple fiber needled geotextile on a sliding layer. The above-mentioned polypropylene staple fiber needle-punched geotextile is applied to a sliding layer, and the polypropylene staple fiber needle-punched geotextile is applied to a sliding layer of a roadbed. The polypropylene staple fiber needled geotextile is applied to the sliding layer of the bridge.

The above-mentioned application of the polypropylene staple fiber needle-punched geotextile on the sliding layer comprises an upper layer of polypropylene staple fiber needle-punched geotextile, an intermediate layer sliding film and a lower layer of polypropylene staple fiber needle-punched geotextile.

The above-mentioned polypropylene staple fiber needle-punched geotextile is applied to a sliding layer, and the sliding film is made of an HDPE film.

Meanwhile, the present invention proposes a sliding layer applied between rigid structures, including a cloth layer and a sliding film; the two are superimposed; and the cloth layer comprises a polypropylene staple fiber needled geotextile.

The above-mentioned sliding layer applied between rigid structures, the polypropylene staple fiber needled geotextile comprises an upper layer of polypropylene staple fiber needled geotextile and a lower layer of polypropylene staple fiber needled geotextile, and the sliding film is located in the upper layer of polypropylene staple fiber Between the needled geotextile and the lower layer of polypropylene staple fiber needled geotextile.

The above-described sliding layer applied between rigid structures, which is an HDPE film.

With the technical solution of the present invention, the following beneficial effects are obtained:

High strength: Adopting polypropylene staple fiber needle-punched geotextile, high strength, smooth surface and good wear resistance. In addition, due to the low specific gravity of polypropylene. 90g/cm3, under the same square meter weight, there is more than polyester. 40% of the number of fibers, so short-staple needle-punched nonwovens have great advantages in strength, uniformity, and tightness, and these characteristics are required for the sliding layer.

Excellent wear resistance: Polypropylene staple fiber needled geotextile, polypropylene elongation at break can reach 70% -100%, much higher than 20% - 30% of polyester, better than other commonly used Chemical fiber, which makes the fiber difficult to break during repeated needle punching, which greatly contributes to the increase in strength and tightness of the nonwoven fabric.

Excellent weather resistance: Polypropylene has strong acid and alkali resistance and can guarantee stable performance under various geological conditions and environments. Polyester has good acid resistance, but its alkali resistance is very poor. It can be decomposed and is not suitable for use in any environment that may be alkaline.

Better creep resistance: On the basis of the high strength and high tightness of the non-woven fabric, the fiber entangled points are melted and consolidated to prevent fiber slippage and ensure the dimensional stability of the polypropylene staple fiber needled geotextile. .

In summary, the physical and chemical properties of polypropylene staple fiber needled geotextiles can satisfy the application in the sliding layer, and some of its physical and chemical properties make it more suitable for use in the sliding layer.

[Description of the Drawings]

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of a roadbed when the present invention is applied to a roadbed. 2 is a schematic structural view of a sliding layer according to Embodiment 1 of the present invention.

【detailed description】

The invention will now be described in further detail by means of specific embodiments and with reference to the accompanying drawings. Embodiment 1:

Referring to FIG. 1 and FIG. 2, in this example, a polypropylene staple fiber needle-punched geotextile is applied to a sliding layer of a roadbed, and the sliding layer has a three-layer structure: including an upper layer of the film layer 11, an intermediate layer 12 and a lower layer. The film layer 13; the upper film layer 11 is made of polypropylene staple fiber needle-punched geotextile, the middle layer 12 is made of HDPE film, and the lower layer film layer 13 is also made of polypropylene o-staple needle-punched geotextile. During the roadbed construction, the polypropylene fiberglass needle-punched geotextile of the lower film layer 13 is laid on the lower concrete 3, combined with the concrete, and the HDPE film of the intermediate layer 12 is laid, and the upper layer cloth is laid on the HDPE film. The polypropylene fiber of the film layer 11 is needled with a geotextile, and the upper concrete 2 is poured. The upper and lower polypropylene staple fiber needle-punched geotextiles are respectively combined with the concrete and separated by the HDPE film of the intermediate layer to form two relatively independent rigid relative slips to eliminate the sudden stress generated by the upper and lower rigid structures to the outside of the protective sliding layer. The purpose of the steel structure is to eliminate stress caused by temperature changes, and to improve the properties of compression resistance, shear resistance, creep resistance, etc., and avoid cracking damage of the roadbed. Polypropylene staple fiber acupuncture

ο

The geotextile uses Lutai Roa t i l e brand polypropylene staple fiber acupuncture geotextile produced by Junfu (Zhaoqing) Fiber Net Materials Co., Ltd.

The polypropylene staple fiber needle-punched geotextile has a smooth surface and the inner fiber is tight, not loose, non-layered, stable in size and not deformed; when combined with concrete, the surface of the concrete can be corrected to make the friction coefficient between the sliding film and the sliding film small. Low friction loss and good relative slip performance, the upper and lower concrete can slide freely to eliminate stress.

Comparison of polypropylene (polypropylene) and polyester (polyester) project polypropylene (polypropylene; ί) 3⁄4 lun (polyester) category

1 specific gravity

2 It is resistant to sunlight and needs to be treated with anti-uv to achieve good

Sexual sunlight resistance

3 Temperature resistance Melting point 170 °C Melting point 260 °C

4 cn/dtex 3 4 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 force

Good wear resistance, good

Good acid and alkali resistance, strong acid, strong alkali, no strength, no weak acid, strong acid, weak base can make it affect the decomposition

Hot melt adhesion

Synergy

Please binding on the propane and, on the wood properties of ^{^:} ratio. The sliding layer does not require sunlight or air, and does not require too high solar resistance. The polypropylene has strong acid and alkali resistance and can guarantee 100% in various geological conditions and environments. The performance is stable. Polyester's acid resistance is acceptable, but its alkali resistance is extremely poor, and it can be decomposed by weak alkali. It is not suitable for use in any environment that may be alkaline. Polyester geotextiles should not be used in environments containing acid and alkali and rain.

When it is above 100 g/m ² , especially in the case of using the needling process, the staple fiber is sufficiently consolidated to form a compact three-dimensional structure, and the strength and uniformity of the staple fiber nonwoven fabric are significantly better than those of the long fiber. Silk non-woven fabric.

Polypropylene has good monofilament strength, good hot melt adhesion, and because of its low specific gravity, the same gram weight of polypropylene has 45% more fiber than polyester, so the strong advantage of polypropylene geotextile is very obvious.

Embodiment 2:

In this example, a polypropylene staple fiber needle-punched geotextile is applied to a sliding layer of a bridge or a track track base, and the sliding layer is a two-layer structure including an upper layer of polypropylene staple fiber needle-punched geotextile and a sliding layer of a PA film.

Embodiment 3:

Based on the first embodiment, the present embodiment is combined with a plurality of sliding layer structures of the first embodiment to form a composite sliding layer structure, which is used between various rigid structures.

The above is a further detailed description of the present invention in connection with the specific preferred embodiments, and the specific embodiments of the present invention are not limited to the description. It is to be understood by those skilled in the art that the present invention can be delineated or replaced without departing from the spirit and scope of the invention. For example, for the special requirements of the sliding layer, the surface of the non-woven fabric can be treated differently to adapt to the function of sliding and combining with concrete and glue. Aiming at the problem that the sliding layer structure is prone to water and moisture, causing rust in the concrete to rust, affecting the structural strength and service life, the non-woven fabric can be specially treated to basically solve the problem of moisture accumulation in the sliding layer structure.

Claims

Claim

1. Application of polypropylene staple fiber needled geotextile on sliding layer.

2. The use of a polypropylene staple fiber needle-punched geotextile according to claim 1 on a sliding layer, wherein: the polypropylene staple fiber needle-punched geotextile is applied to a sliding layer of a roadbed.

3. The use of a polypropylene staple fiber needle-punched geotextile according to claim 1 on a sliding layer, wherein: the polypropylene staple fiber needle-punched geotextile is applied to a sliding layer of a bridge.

The application of the polypropylene staple fiber needle-punched geotextile on the sliding layer according to any one of claims 1 to 3, wherein the sliding layer comprises an upper layer of polypropylene staple fiber needle-punched geotextile and an intermediate layer. The sliding film and the lower layer of polypropylene staple fiber needled geotextile.

The use of a polypropylene staple fiber needle-punched geotextile according to claim 4 on a sliding layer, wherein: the sliding film is an HDPE film.

6. A sliding layer applied between rigid structures, comprising a film layer and a sliding film; the two are superimposed; and the film layer comprises: a polypropylene staple fiber needled geotextile.

7. The sliding layer applied between rigid structures according to claim 6, wherein: the geotextile, the sliding film is located on the upper layer of polypropylene staple fiber needled geotextile and the lower layer of polypropylene staple fiber needled geotextile between.

8. The sliding layer applied between rigid structures according to claim 6 or 7, wherein: the sliding film is an HDPE film.