JPH0118351Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a lining tube for repairing, rehabilitating, or reinforcing pipes. Conventionally, for existing pipes such as gas pipes, water pipes, sewage pipes, or gravel transport pipes, especially old pipes, the inside of the pipes is cleaned while they are buried, and a lining cylindrical body is pasted inside. Measures are being taken to repair, rehabilitate, or reinforce these.
In this case, the lining tubular body is generally an expandable body with a resin layer integrated on one side of a fiber base fabric by adhesive or the like, and these are adhered to the inside of the tube with a curable adhesive. In addition, when adhering the lining cylindrical body to the inside of the pipe, for example, with the adhesive put inside the lining cylindrical body, the cylindrical body is inverted with pressure fluid and the pipe is successively bonded. The cylindrical body is inserted into the inside of the tube and the cylindrical body is bonded to the inner wall of the tube using the adhesive. Steam, hot water, etc. are used as the pressure fluid to accelerate the curing of the adhesive. In particular, the use of steam as a pressure fluid is being considered in order to shorten the construction time and obtain stronger adhesive strength. However, when such measures are taken, the lining tube is heated to 100°C by water vapor.
Or, the resin layer will be heated to a higher level, and the resin layer will be plasticized, and the parts where there are gaps in the connections in the pipes, unremoved rust, or welding burrs on pipe joints, etc., will be plasticized. Pinholes, breaks, etc. may occur in the resin layer. In order to eliminate these drawbacks, it is preferable to increase the thickness of the resin layer of the lining tubular body, but in this case, the reversibility will be poor and excessive shear stress will be applied to the tubular body when it is reversed. There is a drawback that the resin layer and the fiber base fabric layer partially peel off due to overhang. In order to eliminate these drawbacks, the present invention aims to provide a lining cylindrical body that has a resin layer that is more heat resistant, eliminates peeling between the resin layer and the fiber layer, and does not inhibit reversibility. It is characterized by having a resin layer on at least one side on both sides of the fiber reinforced layer, which is formed by braiding, weaving, or winding and laminating synthetic fiber filament bundles and has a porosity of 3 to 60%. The thickness is 0.5~4.0mm
A cylindrical shape for lining, which is coated with a polyurethane elastomer resin layer so that the polyurethane elastomer resin on both sides is integrated through the voids of the fiber-reinforced layer, and the fiber-reinforced layer is embedded in the polyurethane elastomer resin layer. It is the body. First, the fiber reinforcing layer in the present invention is a filament bundle of synthetic fibers, that is, a bundle of multiple or many filaments, a bundle of these filaments or a multifilament yarn, which is braided with a conventional braider or woven with a loom. It has a porosity of 3 to 60%, consisting of two types of threads wound spirally in opposite directions and laminated, and warp threads are also combined. This porosity is expressed as the area ratio of the light-transmitting part per square inch of the fiber reinforced layer, and if the porosity is less than 3%, the resin layers coated on both sides of the reinforcing layer will not be integrated (bridged) through the reinforcing layer. If it exceeds 60%, there is no reinforcing effect on the resin layer. The preferred porosity in this invention is 5
~50%. The resin used in this invention is a polyurethane elastomer resin with good heat resistance, and the resin strength is particularly high.
A value of 80 Kg/cm ³ or more, preferably 130 Kg/cm ³ or more at a temperature of 110° C. is suitable. When this resin has a certain thickness, for example, 1 mm or more, it does not cause pinholes or breakage due to steam pressure treatment during lining. Furthermore, the present invention has a structure in which both sides of the fiber-reinforced layer are coated with polyurethane elastomer resin, and the resin layers on both sides are bridged through the voids of the fiber-reinforced layer. According to this structure, the fiber reinforcing layer is embedded and integrated as an intermediate layer in the resin layer, and it is easy to make the total resin layer relatively thin and not inhibit reversibility. Fig. 1 shows the structure of the lining cylinder of the present invention, in which 1 is a fiber reinforcing layer, 2 and 2' are polyurethane elastomer resin layers, and 3 is a structure in which the resin bridges in the voids of the reinforcing layer. have.
In this example, the fiber reinforcing layer is formed by weaving, but it is also possible to select one in which filament bundles are braided or spirally wound and laminated. The cylindrical body of the present invention is produced by introducing a reinforcing layer formed in advance or a reinforcing layer being formed by a spiral winder or blader into a cylindrical die through which polyurethane elastomer resin is extruded from an extruder. It can be easily manufactured by embedding and integrating the reinforcing layer into the resin layer. Example: A cylindrical base fabric with a diameter of 255 mm was prepared using a 1000 denier 3-strand polyester filament fiber bundle with a fiber density of 9 fibers/25 mm in both the circumferential and longitudinal directions on a loom. The fabric is introduced into a cylindrical die into which polyether-based polyurethane elastomer resin is extruded from an extruder, and the woven fabric is embedded and integrated into the polyurethane elastomer resin layer to form a lining cylindrical body as shown in Table 1. Created. This product has a sufficient peel strength of 14 kg/25 mm between the polyurethane elastomer resin and the reinforcing fiber layer.
The polyurethane elastomer resin was firmly bonded through gaps between reinforcing fibers. The obtained cylindrical body is

[Table] When lining aging gas pipelines,
With the epoxy two-component reaction curing adhesive inside the cylindrical body, apply air pressure of 0.5Kg/ ^cm3 ,
It is inserted into the pipe while being turned upside down, and then a steam pressure of approximately 0.5 kg/cm ³ is sealed inside the tubular body while draining, and the adhesive between the tubular body and the pipe is cured. Ivy. At this time, the inside of the cylindrical body was left exposed to a high temperature of approximately 110°C, and the adhesive was allowed to sufficiently harden over 60 minutes and adhered to the pipe. After cooling, the cylindrical body of the present invention showed almost no decrease in wall thickness due to plastic flow of the polyurethane resin layer.
It also passed the gas leak test without any pinhole breakage.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a partial cross section of the cylindrical body of the present invention, where 1 is a fiber reinforcing layer, 2 and 2' are polyurethane elastomer resin layers, and 3 is a void in the reinforcing layer where the resin layers on both sides bridge. Show part.

Claims (1)

[Claims for Utility Model Registration] (1) A resin layer on at least one side of a fiber reinforced layer formed by braiding, weaving, or winding and laminating synthetic fiber filament bundles and having a porosity of 3 to 60%. A polyurethane elastomer resin layer is coated with a thickness of 0.5 to 4.0 mm, and the polyurethane elastomer resins on both sides are integrated through the voids of the fiber-reinforced layer, and the fiber-reinforced layer is embedded in the polyurethane elastomer resin layer. A cylindrical body for lining, characterized in that it has a shape. (2) Resin strength of polyurethane elastomer resin
The tubular body for lining according to claim 1, which has a weight of 80 kg/cm ² or more at 110°C.