JP2019190014A - Reinforcing method for metallic pipe and reinforcing material - Google Patents

Abstract

To provide an easily executable reinforcing method for a metallic pipe.SOLUTION: A reinforcing method for a metallic pipe related to the present invention includes a step of inserting a cylindrical reinforcing material 100 into a metallic pipe P, injecting a fluidizing solidification material into the inserted reinforcing material 100 and pressing the reinforcing material 100 to an inner wall of the metallic pipe P. As the reinforcing material 100, a plain-woven fiber bundle fabric formed of warps 10 formed of fiber bundles formed by bundling a lot of chemical fibers and wefts 20 connecting the fiber bundles forming the warps 10 with each other is cylindrically formed with the warps 10 set in the vertical direction, and an adhesive layer is formed on an outer surface of the cylindrical form, which is used as the reinforcing material 100.SELECTED DRAWING: Figure 4

Description

  The present invention relates to reinforcement (renovation) of metal pipes such as road lighting poles.

  For example, a road lighting pole standing with its lower end planted in the ground is likely to be corroded from the ground to the lower part, and therefore is reinforced with the reinforcing technique disclosed in Patent Document 1. May be performed. Patent Document 1 discloses that a lot of aramid rods are regularly arranged using a spacer in the lower part from the bottom of the hollow column, and a fluidized solidifying material such as mortar is injected. It is a reinforcement method.

JP2012-225019

  The above-described reinforcing method of the prior art has an improvement in that it takes time to arrange the aramid rod. Further, in the case of a road lighting pole, since electric wiring is arranged in the inside thereof, a reinforcing technique that can reinforce even a metal tube having such an internal part without hindrance is necessary.

  The reinforcing method according to the present invention proposed to reinforce a metal pipe includes inserting a cylindrical reinforcing material into the metal pipe and injecting a fluidized solidifying material inside the inserted reinforcing material. A plain weave fiber comprising a warp consisting of a fiber bundle in which a large number of chemical fibers are bundled and a weft that interconnects the fiber bundle forming the warp as a reinforcing material. The bundle fabric is characterized by using a reinforcing material having a cylindrical shape with the warp in the axial direction and an adhesive layer formed on the outer surface thereof. In this reinforcing material, the portion of the weft that forms a plain weave is a joint between warp passing portions (that is, the portion where the weft passes between the warps to the front and back), and the warp is hinged. It can be bent with. As one aspect, the wefts may be woven so as to pass between the warp yarns every other plurality of the warp yarns, move to the front and back, and float and sink. According to this aspect, the plurality of warp yarns The warp is hinge-connected with a portion of the weft passing between the warp as a joint.

  If the reinforcing method and the reinforcing material according to the present invention are, for example, a fiber bundle fabric made by bundling aramid fibers into a fiber bundle forming warps, the inner wall of the pipe can be simply inserted into a metal pipe. Aramid rods can be placed along In addition, since the reinforcing material can be bent between the warp yarns, the reinforcing material is deformed along the metal pipe even if there is an electric wiring or the like in the metal tube, and the reinforcement can be performed without any trouble.

(A) The top view of the fiber bundle fabric (sheet form) which makes a reinforcing material, (B) The end view explaining the weaving method of a weft, (C) Sectional drawing of the fiber bundle which makes a warp. The figure which shows the fiber bundle fabric of FIG. 1 made into the cylinder shape. The figure which showed a mode that the reinforcing material was inserted in the pipe | tube from the opening of a metal pipe. The figure which shows the reinforcing material inserted in the metal pipe and pressed on the inner wall. The figure explaining the state which the fiber bundle fabric of FIG. 1 made into the cylinder shape deform | transforms. The figure which shows another example of the reinforcing material inserted in the metal pipe and pressed on the inner wall. The figure which showed a mode that it inserts into the pipe | tube from the opening of a metal pipe about the reinforcing material of the example of FIG.

  FIG. 1A is a plan view illustrating a fiber bundle fabric for producing a reinforcing material according to the present invention. The fiber bundle fabric 1 that forms a reinforcing material is a plain weave fabric composed of warps 10 and wefts 20. Each of the warp yarns 10 is composed of a fiber bundle in which a large number of chemical fibers are bundled. The fiber bundles 10 constituting the warp yarns are arranged in a horizontal row with their drawing directions Y parallel to each other, and are connected to each other by the weft yarns 20. Yes. As shown in FIG. 1 (B), the wefts 20 pass between the warp yarns every plural number of fiber bundles 10 forming the warp yarn (every three in this embodiment), from front to back and from back to front. It is woven so as to move up and down, and has a structure in which every three fiber bundles 10 of the warp are hinge-connected using the inter-warp passing portion 21 of the weft as a joint. In this case, the warp fiber bundles 10 can be bonded to each other three by three.

  As can be seen from FIG. 1 (A) and FIG. 1 (B), the warp fiber bundles 10 are bundled together in groups of three in this embodiment by the wefts 20 tensioned by the weaving method. These three are fixed in close contact with each other. On the other hand, since the wefts 20 shift to the front and back every third warp, between the fiber bundles 10 corresponding to the inter-warp passing portion 21 of the weft 20 appearing every three warps, for example, about 0.1 mm to 1 mm, A gap according to the material (or thickness) of the weft 20 exists and is separated. Accordingly, the warp fiber bundle 10 is hinged with the inter-warp passing portion 21 as a joint, and the fiber bundle fabric 1 bends with the inter-warp passing portion 21 as a joint as shown in FIG. The inter-warp passing portion 21 of the weft 20 can be cut by inserting a blade such as a cutter in the gap between the warps, and also has a function as a detaching portion of the warp 10. Such a weft 20 can be made of polyethylene or polypropylene.

  As shown in the cross-sectional view of FIG. 1C (showing one of the fiber bundles), the fiber bundle 10 forming the warp is a high-strength fiber of long fibers in which each one is drawn in the drawing direction Y ( For example, a large number of aramid fibers) 11 are bundled and impregnated with a phenolic, polyester, epoxy or acrylic resin and hardened. The thickness of the single fiber bundle 10 in which the aramid fibers 11 are bundled is, for example, 500 dtex, and it is preferable that the diameter is 0.5 mm or more and 5 mm or less in consideration of the strength for bar arrangement. The hardness of the impregnated resin is preferably 80 or less (Rockwell hardness) when processing the fiber bundle fabric 1.

  The fiber bundle fabric 1 having the above configuration is rounded so that the extending direction Y of the warp yarn 10 is the axial direction of the cylindrical shape, that is, as shown in FIG. Use as Since the warp 10 is hinge-connected at the inter-warp passing portion 21, the fiber bundle fabric 1 can be easily formed into a cylindrical shape by bending this portion. The butted ends when the fiber bundle fabric 1 of FIG. 1 (A) is formed into a cylindrical shape (the left and right side edges of FIG. 1 (A)) may be bound and bound by a binding material of the same material as the weft 20. . Alternatively, it is possible to leave the ends free by simply rounding them into a cylindrical shape.

  The fiber bundle fabric 1 shown in FIG. 2 rolled into a cylindrical shape has an adhesive layer formed on the outer surface thereof. The adhesive layer can be formed, for example, by applying a curable resin such as an epoxy resin to the outer surface. The adhesive layer is preferably formed thicker than the diameter of the weft 20. In forming this adhesive layer, three warps 10 are gathered together in this example, and the three form a single plate, so the adhesive is thickly applied to form the layer. In addition, it is possible to further increase the surface area of the adhesive layer.

  3 and 4, a metal tube reinforcing process using the reinforcing material 100 after the adhesive layer is formed on the cylindrical fiber bundle fabric 1 of FIG. 2 will be briefly illustrated and described.

  The metal pipe P is, for example, a road lighting pole erected on the road, and its lower end is hardened with concrete around and is planted in the ground. The metal pipe P is provided with an opening O at a predetermined position above the ground for internal inspection and the like, and is usually closed with a lid (not shown). The metal pipe P of this example is corroded in the lower part from the ground.

  Since the reinforcing member 100 can be folded and folded at the warp passing portion 21, the reinforcing member 100 is inserted into the metal tube P through the opening O in a folded state. The reinforcing material 100 shown in FIGS. 3 and 4 is shown in gray to indicate that an adhesive layer is formed on the outer surface. The weft 20 is depicted in FIGS. 3 and 4, but this is for illustrative purposes, and the weft 20 is actually covered with an adhesive layer.

  The reinforcing material 100 inserted into the metal tube P expands (or is expanded) from the folded state and returns to the cylindrical shape shown in FIG. Then, a fluidized solidifying material is injected from the pump into the upright reinforcing material 100 using a hose or the like, and is pressed against the inner wall of the metal pipe P so as to spread the reinforcing material 100 from the inside (FIG. 4). The fluid solidifying material is, for example, mortar, and solidifies after curing. Since a plurality of warps 10 are bundled as a set at the time of injecting the fluidized solidifying material, there are few gaps for the fluidized solidified material to leak out of the reinforcing material 100, and the structure is difficult to leak.

  Since the adhesive layer is formed on the outer surface of the reinforcing material 100, the reinforcing material 100 pressed against the inner wall of the metal tube P is fixed to the metal tube P as the adhesive hardens, and is composed of fiber bundles. The warp 10 acts as a reinforcing material. Furthermore, the adhesive of the adhesive layer formed on the outer surface oozes out through the holes opened in the tube wall due to the corrosion and fills the corrugation. Therefore, the corrosion portion is reinforced and repaired from both the inside and outside of the metal pipe P.

  In the case of metal pipes for installing electric appliances such as road lighting, there are holes for power lines in the underground part (in the concrete part in FIGS. 3 and 4), through which power lines are drawn into the metal pipes, The inside of the metal pipe is led to the electric appliance mounted on the tip of the metal pipe. When such an internal part such as an electric wiring is in the metal tube, the fiber bundle fabric 1 bends with the inter-warp passing portion 21 as a joint. Therefore, the reinforcing member 100 is formed along the internal part as shown in FIG. It can be deformed. That is, the reinforcing material 100 made of the fiber bundle fabric 1 shown in FIG. 5 is partially recessed inward along internal parts such as a wiring tube.

  FIG. 6 shows an example of reinforcement in the case where the opening O for inserting the reinforcing material 100 is newly formed in the metal pipe P. The opening O is an opening newly opened at the site for inserting the reinforcing material 100, and is closed with a lid or the like separately prepared after the reinforcing material is applied. The reinforcing material 100 is the same as that described above, but is manufactured such that its axial length reaches above the opening O. In other words, when the reinforcing material 100 is inserted into the metal pipe P and stands upright, the opening O is closed from the inside by the reinforcing material 100. The reinforcing material 100 is provided with an injection port or an injection tube 30 for connecting a hose or the like in order to inject the fluid solidifying material into a portion corresponding to the opening O, from which the fluid solidifying material is press-fitted. After injection of the solidifying material, the inlet or injection tube 30 is sealed. Alternatively, as another method, a solidifying material injection hose can be introduced into the tube from above the metal tube P, and a fluidized solidifying material can be injected into the reinforcing material 100 from above.

  If the opening O becomes a defective portion of the metal tube P, the strength may be lowered if the opening O is left as it is. However, since the defective portion is covered and reinforced by the reinforcing material 100, the strength is not impaired. Rather, enhanced. In the case of a thin sheet-like lining material used for reinforcing metal pipes in the prior art, when the construction is performed in the same manner as in this example, the lining material protrudes from the opening O due to the pressure of the solidifying material injection. Since the reinforcing material 100 according to the invention is a fiber bundle of chemical fibers and has high strength as described above, the reinforcing material 100 can sufficiently resist the solidifying material injection pressure and does not curve and protrude from the opening O. .

  In order to insert the reinforcing member 100 taller than the opening O of this example, first, the reinforcing member 100 is inserted into the metal pipe P upward from the opening O as shown in FIG. If the reinforcing material 100 is lowered when the entire reinforcing material 100 enters the pipe, the upright state of FIG. 6 can be obtained. Other than this insertion procedure, it is as having described regarding the example of FIG.3 and FIG.4.

DESCRIPTION OF SYMBOLS 1 Fiber bundle fabric 10 Warp 11 Chemical fiber 20 Weft 21 Passing part 100 between warps Reinforcement material P Metal pipe O Opening

Claims (4)

A method of reinforcing a metal tube,
Inserting a cylindrical reinforcing material into the metal tube, injecting a fluidized solidifying material inside the inserted reinforcing material and pressing the reinforcing material against the inner wall of the metal tube;
As the reinforcing material, a plain weave fiber bundle woven fabric comprising a warp consisting of a bundle of fibers each of which bundles a number of chemical fibers and a weft that interconnects the bundle of fibers forming this warp, with the warp as the axial direction. A reinforcing method using a reinforcing material having a cylindrical shape and an adhesive layer formed on the outer surface of the cylindrical shape.   The wefts in the reinforcing material are woven so as to pass between the warp yarns every other plurality of the warp yarns, move to the front and back, and float up and down, and pass portions between the warp yarns in every other warp yarns. The reinforcing method according to claim 1, wherein the warp is hinged as a joint. A reinforcing material used to reinforce a metal pipe,
A plain woven fiber bundle woven fabric comprising a warp made of a bundle of a plurality of chemical fibers and a weft that interconnects the bundle of fibers forming this warp into a cylindrical shape with the warp in the axial direction. And a reinforcing material having an adhesive layer formed on the outer surface.   The wefts are woven so as to pass between the warp yarns every two or more warp yarns and move up and down to sink, and the warp yarns between every other warp yarns are used as joints. The reinforcing material according to claim 3, wherein the warp is hinged.