JPS5869039A - Lining base material for conduit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Lining 9 base material r1:4 used for lining work of conduits performed as repair of leakage part due to aging or leak pretreatment
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As an economical method for repairing or renewing aging parts of underground pipes such as waste pipes and water pipes, it is possible to use a cylindrical body of a cylindrical sheet or a fiber base fabric with these sheets. There is a lining method in which a cylindrical body of composite base material is inserted inside a trenched conduit and fixed with an adhesive.

In damaged areas of conduits, it is necessary to use only the lining material to withstand internal pressure such as waste pressure or water supply pressure, and a cylindrical body made only of rubber or plastic sheets is not strong enough, and fiber base fabric and these sheets are not strong enough. It is desirable to have a cylindrical body made of a composite base material.

Due to its economic efficiency, the lining work for underground pipes is carried out by treating the length of the excavated pipe as one work section, which is 199 m or more, preferably 300 m or more. It is desirable that
This length allows several conduits each having a length of 5 to 29 m to be connected. Although the individual pipes have the same nominal size, they do not necessarily have exactly the same inner diameter, and there may be slight differences in the inner diameter. The presence of irregularities on the inner surface of the paper, such as rust, etc., j! Because it is difficult to precisely control the amount of adhesive applied to bond the pipe and the lining base material, that is, the thickness, to a uniform thickness, the outside of the inserted cylindrical body The diameter should be 45 to 10% smaller than the nominal inner diameter of the tube,
It is necessary to inflate the striped base material in the diametrical direction of the tube using compressed air or water pressure during insertion or insertion ψ, and harden the adhesive while tightly adhering it to the inner surface of the conduit. That is, if the lining is applied without performing these operations, wrinkles will occur in the lining base material, creating areas that do not adhere sufficiently to the pipe, and the wrinkles will cause pressure loss.

Cylindrical inner S made of fiber-tree composite! Transfer the base material inside the conduit @
When inserting it into the tank and applying internal pressure to inflate it, the method using water pressure may be used depending on the construction site and if there is no fresh water source nearby61.
Therefore, when lining a gas pipe with a pressure of mg and air, there is no need to dry the inside of the pipe after the contact layer is fixed.

However, unlike applying internal pressure using incompressible water as a medium, when using compressed air, there may be some defects in the lining of the air introduction part or the outlet part, or if the cylindrical base material The insertion edge of the material is created during the expansion operation, etc. If the lining paper base material ruptures due to some unforeseen problem, a large amount of compressed air inside will instantly blow out. Since it may cause harm to the plant or the surrounding area, the gauge pressure I If should be 7- or less, preferably FiO.
, a to QJ, it is necessary for safety to perform the expansion operation at an internal pressure of /-. Therefore, the cocoon-shaped lining 9 base material has a pressure resistance that is at least twice as strong as the feeding pressure when gas or water is normally supplied *L, according to Kyowa and Todoroki WJO when the lining is small.
It must be 8J16K 5 to 50 diametrically expandable at an internal pressure of 0.3 to Q and 6 buttocks/cIII.

Under these conditions, we investigated Type A for a base material that can be lined smoothly without causing inner ff1KL warpage, and the results were as follows: inner s! It was discovered that when the base material expands in the diameter direction of the tube, a large change in dimension in the length direction of the tube, that is, a large shrinkage behavior is inappropriate. Gauge pressure of 0.5 Kl/17 with just the cylindrical base material without inserting it into the conduit
When an internal pressure of When a cylindrical base material of approximately 3 inches or more is inserted into the conductor 9 and expanded repeatedly, the following phenomenon is observed. For R, insert a cylindrical base material into the conduit and feed compressed air to increase the internal pressure to 0.5 m/l.
As the tube is raised up to 50 degrees, the base material expands in the diametrical direction, and a movement phenomenon of the cylindrical base material occurs in the length direction of the tube. The inner surface of the tube is not smooth (ke), so the movement of the cylindrical base material is not smooth, and there are places where elongation stress is applied in the length direction at the extreme parts, and there are places where elongation stress is strong and the movement of the cylindrical base material is caused in the diameter direction at the tip. Because expansion is restricted.

When the adhesion to the pipe is insufficient, the lining protrudes from the inner surface of the pipe in a ridge-like manner. Furthermore, the cylindrical base material moves along the inner surface of the tube, which may cause damage to the base material. For example, by adjusting the weaving angle of the cylindrical inner lining made of a fiber-reinforced structure made of braid or spiral ink, one tension in the diametrical direction of the tube can be achieved against harmful birds. However, it is impossible to create a smooth inner wall with large dimensional changes in the longitudinal direction, and it is round. In view of such circumstances.

The cylinder can easily expand in the diametrical direction and has little contraction in the longitudinal direction.
As a result of extensive research into the inner lining base material, we have arrived at the invention of the present application.

That is, the reinforcing base fabric has warp fibers 1 arranged in the length direction of the cylinder.
In contrast, the fineness of the weft yarns arranged in the circumferential direction of the tube is 7/1.
G or less, preferably 5/1 o or less, the warp is almost straight and the weft is bent along the circumference of the warp, and then an appropriate tension is applied in the warp direction. Heat treatment is applied so that the weft is bent even more sharply and fixed in that shape, and the amount of yarn in the warp is greater than the amount of yarn in the weft.]
It shall be of structure. The performance of the fiber base fabric thus obtained should not be changed significantly.

Select the type and thickness of the resin film and match it to one or both sides of the fiber base fabric to create a fiber resin composite base material,
When a tensile test was conducted in the weft direction of the composite base material,
A pipe with a cutting elongation of 3091 or more and 70% or less and a mid-way elongation at a cutting strength of 1710 that is 30 or more of the cutting elongation has the desired handling strength and is suitable for the inner surface of the pipe. It was discovered that the cylindrical base material can be lined smoothly without wrinkles.

The relationship between the burst pressure of the cylindrical body and the fracture force in the circumferential direction and the lengthwise direction of the cylinder is shown as follows. (Compiled by Japan JMU Industrial Engineers Association: JMU Technical Highest 1441i Semi-Volume 5, J6-S) D = Diameter of the pipe just before rupture 11), From formula 421, the withstand pressure of the cylindrical body is determined by the weft of the base material. It depends on the strength in the direction, and if the strength in the warp direction is 172 or more than the strength in the weft direction, it is bad. Therefore, if it is limited only to withstand pressure, it is economical to make the warp fineness #in equal to or thinner than the yarn, and the warp yarn amount to be smaller than the weft, but in the case of such a configuration, It has a structure in which the weft yarns are bent less, and the warp yarns are bent more, and the cylindrical body expands at a pressure as low as 1 kVs. On the other hand, by setting the fineness of the weft to less than 7/1O of the warp, preferably less than 5/1O, and ultimately making the yarn amount of the warp greater than that of the weft, the weft is removed from waste. - Since the structure is as follows, there are 6,
As shown in Comparison Example 41 below, when the warp and weft finenesses are the same, even if heat treatment is applied, the bending of the weft is insufficient and the performance aimed at by the present invention cannot be achieved.

The resin film to be stretched over the fiber base fabric is not particularly limited in material, but fkVh changes the performance of the fiber base fabric by 1 kv%. It is necessary to decide on the adhesion method.

The inner base material is 0.3~o, i soku/ex? 'tkru low i
KFi has the ability to expand by 5 to 10 liters under pressure.
A tensile test was conducted in the circumferential direction of the base material, that is, in the weft direction, and it was found that the material must elongate at least 10 m1 with low stress during running, but such performance cannot be achieved unless the elongation at break is 30 inches or more. Therefore, from equation 11), the relationship between the strength and elongation of jI material and the bursting pressure is as follows (31)
It is derived from the formula, and as the cutting elongation increases, the withstand pressure decreases. Therefore, the cutting elongation [t
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Here~: Cutting elongation tensile test in the weft direction (-The resulting fiber cord gI11 composite base V initial t5 yuras is expressed as the elongation under a constant load in the same way as the fiber cord, Pa, and dovetail base fabric. However, as a result of considering the base material with strength according to the inner diameter of the t, the lining base material e, and the ultimate pressure resistance rc, the cutting strength rJl/
It was discovered that if the elongation at 100 degrees is 30 times or more than the cutting elongation, the straw-like circular base material can be lined smoothly in any warehouse.

With a base material that has such performance, the runout is non-6 in the weft direction. and elongates by more than 10% due to infertile stress.

The warp yarns are hardly bent by the stress generated in the weft yarns, and therefore the shrinkage in the longitudinal direction of the tube is negligible, resulting in a weight of 0.3 to 0.6 kg when the lining of one conduit is small.
/ctg', no wrinkles occur, the lining base material is sufficiently adhered to the inner wall of the pipe, and it exhibits sufficient pressure resistance.

The following is an example and a comparative example. I will clarify.

Example 111 A base fabric with a flat TK structure using 50009 niel for the yarn and 2000 denier twisted polyester fiber for the weft was Il*L, so that the weft was further bent along the curve of the warp. Heat treated.

A piece of the base fabric after heat treatment is pasted with a low melting point polyester resin with a thickness of Wj#C200s to create an lining or base material.

The warp of the iron base material is 33 7'5cIR, and the weft is! 3*15
With the configuration of cIm, the tensile test results in the weft direction show that the cutting strength is 7947 cm, the cutting elongation is 52%, and the mid-way elongation at IAO strength, that is, 7.9 Kf/lsm, is 6 at 5%.
Cane. 1/10 powerful time extension! was 43- when the cutting elongation was set as 100.

Outer diameter 185cm with the weft direction of the iron base material aligned in the circumferential direction of the tube
- When a cylindrical body was created and an internal pressure of 0.5 If/am" was applied using compressed air with only the cylindrical base material, the outer diameter of the cylinder expanded to 13.5"j. , the length of the cylinder is Q,
9 - Contracted. Apply an Evo+Si adhesive to the fiber base fabric surface of this cylindrical body, insert it into a conduit connected to 20 cast iron pipes each 5 m long with a nominal inner diameter of 200 mm, and press the gauge pressure 0. It was adhesively fixed by applying an internal pressure of s h/-. After the adhesive had sufficiently hardened, we cut the round tube and examined the inner surface in detail, and found that there were no wrinkles or damage to the base material, and the lining was smooth.

Comparative Example 111 A base material was prepared by laminating a 200μ thick low-melting point polyester film on one side of a base fabric with a rounded f&g structure using silk yarn and a polyester fabric with a weft K100 denier. The warp of the base material is 1551. The weft is 5
0 pieces 1551] configuration, the tensile test results in the weft direction are as follows:
Strong cutting cuff 2Q/lss, cutting extension 17.3%, 7
At 1 bay/cI 11, the mid-way elongation is λ2-(cutting elongation X5-
) and 6 pieces. The inner pressure of the cylindrical body of 11198 mm outside the material is 0.5 mm/lx'', the zero expansion is 1.6 inches, and the contraction in the length direction is 2.1 inches, 6 points ahead.Nominal inner diameter 200 ■A #tubular body was inserted into a φ cast iron pipe, and an internal pressure of 0.5Kg/♂ was applied to fix it with adhesive. When the inside was inspected, many wrinkles were found.

Comparative Example (2) A base fabric with a plain weave structure using 2000 denier polyester fabric for the warp and weft was prepared, and then heat treated to bend the weft.

Thickness 200. A piece of low melting point polyester film
A composite base material was prepared using K. The warp of the mosquito base material is 38
The book is 15 ts long and the weft is 33 15 m long.

The results of the tensile test in the weft direction were that the cutting strength was 86, the elongation at one cut was 41%, and the elongation at one time was 8.6, and the elongation at one time was 9.5% (23 Ls of elongation at break). The internal pressure of the cylindrical body of the base material with an outer diameter of 190φ is o, s 10I? The dimensional changes were a diameter expansion of 63 inches and a length contraction of 45 seconds. Results of a lining test on the cylindrical body having a nominal inner diameter of 200 HMφ cast iron pipe.

Several areas where the lining base material protruded in the direction of the inner mountain of the link-shaped VC were observed.

Example 12 A base fabric with a plain weave structure consisting of 1,680 denier for the warp and 840 denier for the weft,
After heat treatment to bend the weft, one side has a thickness of 1
A composite base material was prepared by laminating a low melting point nylon film of 5071.

The base material has a configuration of 33 warps and 15am, and 30 wefts of 15α, cutting strength in the weft direction is 36/steel, and cutting elongation is 61.
3.6 Ky/c'lll Samurai A cylindrical body with an outer diameter of 92 mm made of a # base material with an intermediate elongation of 21 degrees (cutting elongation of 34 points) was inserted into a cast iron pipe with a nominal inner diameter of 10100 l1, and the inner After fixing it, the inner surface had a smooth lining.

[Brief explanation of the drawing]

Figure 1 is of Example (1), Figure #I2 is of Comparative Example (1), Figure 3 is of Comparative Example 12+, and Figure 4 is of Example (2), with strong elongation fill lines in the weft direction. shows. Source: 1111J Co., Ltd. Manufacturing Co., Ltd. 1, 1, 1
・V agent middle am-”・ 1 knee 71.I Iwa Qin 1n Article 2 r?J $31!] Dormitory 4 B

Claims (1)

[Scope of Claims] 11) The fineness of the weft is 7/with respect to the warp yarn l[vc]
1O or less, preferably 5/1O or less, the warp is straight, the weft is bent along the circumference Im of the warp, and -
The KJ1 fiber is made into KJ1 fibers in the first order, and the weft is heat-treated so that the weft is bent more sharply.The synthetic fiber base fabric is used as a reinforcing fabric, and one or both sides of the base fabric are combined with an AIK resin film to form a composite base material. 6, the cutting elongation of the composite base material in the weft direction is 5o.
A lining material for a conduit, characterized in that Ls is greater than or equal to 70-, and the midway elongation at a cutting strength of 1/10 is greater than or equal to the cutting elongation of 30- or more. 1ri *Xu Fei Jingfan@The inner lining base material described in (1) 0@It is a cylindrical body formed with the thread direction facing the chest direction 4!
+Inner lining base material for reference.