JP2014047464A - Structure and method for fitting hardware to corrosion protective surface of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely close a clearance between a corrosion protective surface of a concrete structure and a hardware installed in the corrosion protective surface.SOLUTION: A synthetic resin material in a position near a fitting part 11 of a step 1 continuing to the fitting part 11 and projecting from a corrosion protective surface 201 in a fitting state of the step 1 is threaded to provide a thread part 131. A nut 14 made of the same synthetic resin material as the corrosion protective surface and having a size and a shape capable of shielding a clearance between the corrosion protective surface 201 and the step 1 is fitted to the thread part 131. The nut 14 is brought into contact with the corrosion protective surface 201, and contact surfaces between the nut 14 and the corrosion protective surface 201 are fused to bind with each other by heat welding or ultrasonic welding and water-tightly joined to each other.

Description

  The present invention relates to a hardware mounting structure and method for a corrosion protection protective surface of a concrete structure used when, for example, a footrest hardware is attached to a corrosion protection protective surface of a concrete structure of a water and sewage facility.

In general, concrete structures in water and sewage facilities are susceptible to deterioration such as corrosion depending on the usage environment.
For example, when the manhole in a sewage treatment facility is a concrete structure, manure, detergent, industrial wastewater, etc. are poured into the sewer to which the manhole is connected, and hydrogen sulfide generated from these wastewater becomes sulfuric acid by microbial action. This corrodes the inner wall (concrete surface) of the manhole.
Therefore, in order to protect the concrete surface of such a manhole from corrosion, generally, the concrete surface is covered with an anticorrosion sheet made of a synthetic resin material (A) such as a high-density polyethylene sheet. Such anticorrosion method is disclosed in Non-Patent Document 1, for example.

In addition, hardware is often installed as ancillary equipment on the concrete surface of such sewage treatment facilities.
For example, on the inner wall surface of the manhole, a step (foot metal) used by a worker or the like to move up and down in the manhole is installed. In this case, the step is a U-shaped metal core covered with a corrosion protection cover made of a synthetic resin material (B), and a predetermined range at both ends of the core material is an attachment portion fixed to the inner wall surface of the manhole. The mounting portion is threaded, and an intermediate portion that is U-shaped between these mounting portions becomes a step body that protrudes on the inner wall surface of the manhole. The cover is covered. When this step is attached to the anticorrosion protection surface covered with the anticorrosion sheet on the inner wall surface of the manhole, a hole is made in the concrete through the anticorrosion sheet of the anticorrosion protection surface, and the attachment part of the hardware is attached to the chemical (adhesive) ) To be inserted and fixed. Then, the gap between the anticorrosive sheet on the anticorrosive protective surface and the step is filled with a putty such as an epoxy resin to prevent the intrusion of corrosive substances and the corrosion of the concrete frame. This type of manhole step is disclosed in Patent Document 1, for example.

Corrosion control technology and anti-corrosion technology guideline and manual for concrete structures in sewer facilities (Japan Sewerage Corporation) Japanese Patent No. 3819992

  However, in the conventional mounting of hardware such as steps, the gap between the synthetic resin material (A) of the anticorrosion protection surface and the hardware coated with the synthetic resin material (B) different from the synthetic resin material (A) is epoxy resin. When high-density polyethylene is used for the synthetic resin material (A) on the anti-corrosion protection surface to prevent the invasion of corrosive substances, the epoxy resin adheres to this polyethylene. There is a problem that the force is not sufficient, and it peels off in a few years after construction, and a gap is formed between the anticorrosion protection surface and the hardware, and a corrosive substance enters from this gap to corrode the concrete.

  The present invention solves such a conventional problem, and a member for preventing the gap between the anticorrosion protective surface coated with the synthetic resin material of the concrete structure and the hardware installed thereon is provided. Metal fittings for anti-corrosion protection surfaces of concrete structures that can be joined and sealed tightly against the anti-corrosion protection surface to reliably prevent the entry of corrosive substances and prevent corrosion of concrete. An object is to provide a mounting structure and method.

  In order to achieve the above-mentioned object, the present invention is provided with a hole in the concrete concrete that penetrates the synthetic resin material of the anticorrosion protection surface on the anticorrosion protection surface coated with the synthetic resin material of the concrete structure. In the hardware mounting structure of the anticorrosion protection surface of the concrete structure to which the mounting portion of the hardware formed by coating the synthetic resin material on the metal core material is inserted and fixed in the hole, the mounting of the hardware A threaded portion formed by screwing a synthetic resin material covering the proximity position at a position adjacent to the mounting portion that protrudes from the anticorrosion protection surface in a mounting state of the hardware in succession to the portion; A nut made of a synthetic resin material or coated with a synthetic resin material, and having a size and shape capable of shielding a gap between the anticorrosion protection surface and the hardware. On the protective surface The nut of the metal fitting thus determined is brought into contact with the anticorrosion protection surface, and the contact surface between the nut and the anticorrosion protection surface is joined in a watertight manner by fusion or via an adhesive. .

Further, in order to achieve the above object, the present invention provides a corrosion prevention protective surface coated with a synthetic resin material of a concrete structure with a hole in the concrete through the synthetic resin material of the corrosion protection protective surface, In the method of attaching a hardware to a corrosion-proof protective surface of a concrete structure to which a fitting portion made of a metal core covering a synthetic resin material is inserted and fixed in the hole, and fixing the hardware, the mounting of the hardware A screw portion is provided by cutting a synthetic resin material covering the proximity position at a position adjacent to the attachment portion that protrudes from the anticorrosion protection surface in a state where the hardware is attached to the screw portion, A nut made of a synthetic resin material or coated with a synthetic resin material having a size and shape capable of shielding a gap between the anticorrosion protection surface and the hardware is attached, and the hardware is fixed to the anticorrosion protection surface. , The nut is brought into contact with the corrosion protection surface, between the contact surfaces of the nut and the corrosion protection surface via fusion or by adhesive, to bond the watertightness, and summarized in that.
In this case, the nut is formed or covered with a synthetic resin material that is the same as or different from the synthetic resin material of the anticorrosion protection surface that is suitable for thermal welding or ultrasonic welding to the anticorrosion protection surface, and the nut is heated on the anticorrosion protection surface. It is preferable to fuse by welding or ultrasonic welding.
Further, the nut is formed or covered with a synthetic resin material that is the same as or different from the synthetic resin material of the anticorrosion protective surface adapted to adhere to the anticorrosion protective surface with a predetermined adhesive, and the nut is applied to the anticorrosion protective surface with the predetermined anticorrosion protective surface. You may adhere | attach through this adhesive agent.
In this case, it is preferable that a sealing material is interposed between the nut and the threaded portion of the hardware to seal the gap between the nut and the threaded portion in a watertight manner.

  According to the metal attachment structure and method of the anticorrosion protection surface of the concrete structure of the present invention, the proximity position is covered at a position adjacent to the attachment portion protruding from the anticorrosion protection surface in the attachment state of the hardware in a state where the hardware is attached. A nut made of a synthetic resin material having a size and shape capable of shielding the gap between the anticorrosion protection surface and the hardware, or a nut formed by covering the synthetic resin material with a threaded portion provided on the synthetic resin material. Since the nut is brought into contact with the anticorrosion protection surface, and the contact surface between the nut and the anticorrosion protection surface is joined in a watertight manner by fusion or via an adhesive, the synthetic resin material of the concrete structure The anti-corrosion protection surface covered with anti-corrosion and the hardware to be installed on it can be sealed in a watertight state by joining the nuts to the anti-corrosion protection surface in a state where the nut is sufficiently adhered to prevent the entry of corrosive substances. Surely prevent It is possible to prevent corrosion of Nkurito achieves the present invention own particular effect that.

The figure which shows the hardware attachment structure and method of the anticorrosion protection surface of the concrete structure by this invention Diagram showing the work process of this method The figure which shows the structure of the step used for the structure and method ((a) is a top view (b) is a side view) The figure which shows the structure of the nut used for the structure and method ((a) is a front view (b) is a side view) The figure which shows the image of a part of the work process of the method

Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
In each embodiment, a manhole of a sewage treatment facility is illustrated as a concrete structure, and a step (foot hardware) is illustrated as a hardware. In this case, as shown in FIG. 1, the inner wall surface (concrete surface) of the manhole 2 is covered with a synthetic resin material (A), in this case, an anticorrosion sheet 21 made of high-density polyethylene to protect the concrete surface from corrosion. Yes. Also, as shown in FIG. 3, step 1 is a U-shaped metal core coated with a synthetic resin material (B), and a predetermined range at both ends is fixed to the inner wall surface of the manhole 2, respectively. The mounting portion 11 is threaded at the portion 11, and an intermediate portion continuous in a U-shape between the mounting portions 11 is projected on the inner wall surface of the manhole 2, and the outer peripheral surface of the step body 12 The anticorrosion cover 13 which consists of a synthetic resin material (B) is coat | covered.

(Embodiment 1)
First, a first embodiment will be described with reference to FIGS.
FIG. 1 shows the hardware mounting structure of the anticorrosion protection surface of this concrete structure. As shown in FIG. 1, in this mounting structure, the synthetic resin material of the anticorrosion protection surface 201 is applied to the anticorrosion protection surface 201 that is anticorrosion-coated with the anticorrosion sheet 21 made of the synthetic resin material (A) of the manhole 2 as in the conventional case. A step fixing hole 22 is formed in the concrete frame 20 through (A), and the mounting portion 11 of step 1 is inserted and fixed to the hole 22 via an adhesive 23 to attach step 1.
And in this attachment structure, the synthetic resin material (B which covers the said proximity position in the position which adjoins to the attachment part 11 which continues from the attachment part 11 of step 1 and protrudes from the anticorrosion protection surface 201 in the attachment state of step 1 in particular. ) And a screw portion 131 formed by being screwed into the anticorrosion cover 13, and a size and shape that can be screwed into the screw portion 131 and shield the gap between the anticorrosion protection surface 201 and step 1. A nut 14 made of a synthetic resin material (A) or coated with a synthetic resin material (A), the nut 14 of step 1 fixed to the anticorrosion protection surface 201 is brought into contact with the anticorrosion protection surface 201, The contact surfaces of the nut 14 and the anticorrosion protection surface 201 are joined in a watertight manner by fusion.
Due to the mounting structure of step 1, the nut 14 of the screw portion 131 of step 1 is sufficiently closely bonded to the anticorrosion protection surface 201, and the anticorrosion protection surface 201 and the step 1 installed on the anticorrosion protection surface 201 by this nut 14; The gap is closed watertight.

FIG. 2 shows a hardware attachment method for the anticorrosion protection surface of the concrete structure.
As shown in FIG. 2, in this attachment method, first, the preparation in step 1 is performed first, and then the installation work in step 1 is performed.

In advance preparation of step 1, a part of step 1 is processed and the nut 14 used for this step 1 is manufactured.
In FIG. 2, in the processing of step 1, a synthetic resin material that covers the proximity position at a position adjacent to the mounting portion 11 that is continuous with the mounting portion 11 of step 1 and protrudes from the anticorrosion protection surface 201 in the mounting state of step 1. A screw part 131 is formed by cutting a screw in B). In this case, as shown in FIG. 3, in step 1, a synthetic resin is applied to the step main body 12 that protrudes on the inner wall surface of the manhole 2 at the intermediate portion that is continuous in a U-shape between the attachment portions 11 at both ends of the metal core. Since the anticorrosion cover 13 made of the material (B) is covered, the screws are cut from the both ends of the anticorrosion cover 13 so that the outer dimension of the anticorrosion cover 13 is a mountain about 5 cm in length.
In the production of the nut 14, the synthetic resin material or the synthetic resin material having a size and a shape that can be screwed into the screw portion 131 of Step 1 and shield the gap between the anticorrosion protection surface 201 and Step 1 is used. The coated nut 14 is manufactured.
In this case, the anticorrosion sheet 21 made of the synthetic resin material (A) of the anticorrosion protection surface 201 is a thermoplastic resin, and the anticorrosion protection surface 201 suitable for heat welding or ultrasonic welding of the nut 14 to the anticorrosion protection surface 201. The synthetic resin material (A) is the same as the synthetic resin material (A). Further, in this case, as shown in FIG. 4, the nut 14 has a substantially circular shape, and the surfaces of the outer peripheral surfaces thereof facing each other are formed in a flat shape.
Here, the nut 14 is manufactured from the synthetic resin material (A). However, if the synthetic resin material is suitable for thermal welding or ultrasonic welding to the anticorrosion protection surface 201, the nut 14 is protected from the anticorrosion protection surface. A synthetic resin material different from the synthetic resin material (A) 201 may be used. Further, the nut 14 may be formed of another material, and the nut 14 may be covered with a synthetic resin material. When the nut 14 is covered with a synthetic resin material, the synthetic resin of the anticorrosion protection surface 201 is used as long as the synthetic resin material used is a synthetic resin material suitable for thermal welding or ultrasonic welding to the anticorrosion protection surface 201. The synthetic resin material may be either the same as or different from the material (A), and the synthetic resin material may be integrally attached to the nut. In this case, the synthetic resin material may be coated on the entire nut 14, or at least a part of the nut 14 such as a surface facing the anticorrosion protection surface 201 may be coated.
In this way, the vicinity of the step attachment portion 11 is processed to form the screw portion 131, and the nut 14 screwed to the screw portion 131 is manufactured from the same material as the synthetic resin material (A) of the anticorrosion protection surface 201. The nut 14 is screwed onto the screw part 131 of step 1 and attached. In this case, a sealing material is interposed between the nut 14 and the screw part 131 of Step 1 by wrapping a seal tape around the screw part 131 of Step 1 to seal the gap between the nut 14 and the screw part 131 in a watertight manner. It is preferable to keep it.

In FIG. 2, in the installation work in Step 1, the inner wall surface of the manhole 2 is covered with the anticorrosion sheet 21 made of the synthetic resin material (A), and then, as shown in FIG. A hole 22 for step attachment is made in the concrete frame 20 through the inner surface of the anticorrosion sheet 21 on the inner surface.
Next, a step fixing adhesive 23 is added to the hole 22, and the step attaching portion 11 is inserted and fixed into the hole 23 to attach the step 1 to the anticorrosion protection surface 201. At the time of attachment in Step 1, the nut 14 can be moved forward and backward with respect to the attachment portion 11 in Step 1 on the screw portion 131 in Step 1. Therefore, the nut 14 is attached to the screw portion 131 in Step 1 in advance. The clearance is provided between the nut 14 and the anticorrosion protection surface 201 by moving backward with respect to the mounting portion 11 in step 1.
Then, after the adhesive 23 is solidified and step 1 is fixed to the anticorrosion protection surface 301, the nut 14 is tightened toward the anticorrosion protection surface 201 on the screw portion 131 of step 1 to contact the anticorrosion protection surface 201, The anticorrosion protection surface 201 made of the synthetic resin material (A) and the contact surface of the nut 14 made of the same synthetic resin material (A) as the synthetic resin material (A) of the anticorrosion protection surface 201 are fused and integrated to form a watertight To join.
In this case, the nut 14 is fused to the anticorrosion protective surface 201 by heat welding or ultrasonic welding. In the case of heat welding, although not particularly illustrated, the contact surfaces of the nut 14 and the anticorrosion protection surface 201 are heat-sealed and joined using a dryer, a heat-sealing machine, or the like. In the case of ultrasonic welding, as shown in FIG. 5, an ultrasonic oscillator is used to vibrate between the contact surfaces of the nut 14 and the anticorrosion protection surface 201, thereby contacting the nut 14 and the anticorrosion protection surface 201 with ultrasonic vibration. Frictional heat is generated on the surfaces, and the contact surfaces of the nut 14 and the anticorrosion protection surface 201 are fused and joined.
In this way, step 1 is attached to the anticorrosion protection surface 201 of the manhole 2.
By the construction method of step 1, the nut 14 of the screw part 131 of step 1 is sufficiently closely joined to the anticorrosion protection surface 201, and the nut 14 is used to attach the anticorrosion protection surface 201 to the step 1. The gap is closed watertight.

  As described above, according to the first embodiment, the proximity position is set at a position adjacent to the attachment portion 11 that is continuous with the attachment portion 11 of Step 1 and protrudes from the anticorrosion protection surface 201 in the attachment state of Step 1. The thread portion 131 provided by cutting the synthetic resin material to be coated is made of a synthetic resin material having a size and shape capable of shielding the gap between the anticorrosion protection surface 201 and Step 1 (or synthetic resin material) A nut 14 is attached, the nut 14 is brought into contact with the anticorrosion protection surface 201, and the contact surfaces of the nut 14 and the anticorrosion protection surface 201 are welded together by heat welding or ultrasonic welding to join watertightly. Therefore, the gap between the anticorrosion protection surface 201 and the step 1 installed on the anticorrosion protection surface 201 can be joined in a state where the nut 14 is sufficiently adhered to the anticorrosion protection surface 201 to be sealed watertight, so that the corrosive substance is immersed. Can be prevented reliably prevents corrosion of concrete.

  Moreover, according to this structure and method, the vulnerability of the anticorrosion coating layer due to the installation of steps can be avoided, and the required quality of sheet lining in the anticorrosion manual (Non-Patent Document 1) of the Japan Sewerage Corporation is 10 years. The above durability can be realized.

(Embodiment 2)
Next, a second embodiment will be described with reference to FIGS.
As shown in FIG. 1, in the structure of the first embodiment, the nut 14 of Step 1 fixed to the anticorrosion protection surface 201 is brought into contact with the anticorrosion protection surface 201, and between the contact surfaces of the nut 14 and the anticorrosion protection surface 201. Are joined in a watertight manner by fusion, the structure of the second embodiment is such that the nut 14 of step 1 fixed to the anticorrosion protection surface 201 is brought into contact with the anticorrosion protection surface 201, and the nut 14 and the anticorrosion protection surface The contact surfaces of 201 are joined in a watertight manner via an adhesive.

That is, in the structure of the second embodiment, the synthetic resin material (A) of the anticorrosion protective surface 201 penetrates the anticorrosion protective surface 201 coated with the anticorrosion sheet 21 made of the synthetic resin material (A) of the manhole 2. Then, a hole 22 for fixing the step is formed in the concrete frame 20, and the attachment portion 11 of Step 1 is inserted and fixed to the hole 22 via the adhesive 23, and Step 1 is attached. And in this attachment structure, the synthetic resin material (B) which covers the said proximity position in the position which adjoins to the attachment part 11 which continues from the attachment part 11 of Step 1 and protrudes from the anticorrosion protection surface 201 in the attachment state of Step 1 And a synthetic resin material having a size and shape that can be screwed into the screw portion 131 and that can shield the gap between the anticorrosion protection surface 201 and step 1. A nut 14 made of A) or coated with a synthetic resin material (A), and the nut 14 of Step 1 fixed to the anticorrosion protection surface 201 is brought into contact with the anticorrosion protection surface 201, and the nut 14 and the anticorrosion protection surface The contact surfaces of 201 are joined in a watertight manner via an adhesive.
Even in this manner, the gap between the anticorrosion protection surface 201 and the step 1 installed on the anticorrosion protection surface 201 can be joined in a state in which the nut 14 is sufficiently adhered to the anticorrosion protection surface, and watertightly closed. The same effects as the embodiment can be achieved.

  As shown in FIG. 2, in the method of the first embodiment, the nut 14 is brought into contact with the anticorrosion protection surface 201, and the contact surfaces of the nut 14 and the anticorrosion protection surface 201 are joined in a watertight manner by fusion, In 2nd Embodiment, the nut 14 is made to contact the anticorrosion protection surface 201, and the contact surface of the nut 14 and the anticorrosion protection surface 201 is joined watertightly via an adhesive agent.

That is, in the method of the second embodiment, first, the preliminary preparation of Step 1 is performed, and then the installation work of Step 1 is performed.
In preparation for Step 1, a part of Step 1 is processed, and the nut 14 used in Step 1 is manufactured. In this case, the processing in step 1 and the production of the nut 14 are the same as in the first embodiment, and are as described above.
In the installation work of Step 1, after coating the inner wall surface of the manhole 2 with the anticorrosion sheet 21 made of the synthetic resin material (A), the inner surface of the manhole 2 which is anticorrosion-coated with the anticorrosion sheet 21 is coated with the anticorrosion sheet 21 on the inner surface. And a step fixing hole 22 is made in the concrete frame 20.
Next, a step fixing adhesive 23 is added to the hole 22, and the attachment portion 11 of Step 1 is inserted and fixed to the hole 22 to attach Step 1 to the anticorrosion protection surface 201. At the time of attachment in Step 1, the nut 14 can be moved forward and backward with respect to the attachment portion 11 in Step 1 on the screw portion 131 in Step 1. Therefore, the nut 14 is attached to the screw portion 131 in Step 1 in advance. The clearance is provided between the nut 14 and the anticorrosion protection surface 201 by moving backward with respect to the mounting portion 11 in step 1.
Then, after the adhesive is solidified and step 1 is fixed to the anticorrosion protection surface 201, the nut 14 is tightened toward the anticorrosion protection surface 201 on the screw portion 131 of step 1 to come into contact with the anticorrosion protection surface 201, The anticorrosion protection surface 201 made of the resin material (A) and the contact surface of the nut 14 made of the same synthetic resin material (A) as the synthetic resin material (A) of the anticorrosion protection surface 201 are bonded together with an adhesive. And watertightly joined.
Even in this way, the gap between the anticorrosion protection surface 201 and the step 1 installed on the anticorrosion protection surface 201 can be joined in a state in which the nut 14 is sufficiently adhered to the anticorrosion protection surface 201 to be watertightly closed. The same effects as those of the embodiment can be obtained.

In each of the above embodiments, the step mounting portion is exemplified as being fixed to the step fixing hole provided on the inner surface of the manhole via an adhesive, but the step mounting portion is fastened to the nut. The fixing type of this step is not particularly limited.
In each of the above embodiments, a manhole is illustrated as a concrete structure and a step is illustrated as a hardware. However, in a sewage treatment plant, not only steps but also resin-coated pipes and resin-coated handrails are often used. Since the intrusion of corrosive substances from around these pipes and handrails is a problem, if the ends of the pipes and handrails are covered with synthetic resin and fixed with this technology, the intrusion of corrosive substances Can be prevented. Furthermore, various kinds of hardware are attached to concrete tanks, water tanks, chemical tanks, etc., and this technology can be applied in the same way even when attaching hardware to the anticorrosion protection surface of such concrete structures. An effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Step 11 Attachment part 12 Step main body 13 Anticorrosion cover 131 Screw part 14 Nut 2 Manhole 20 Frame concrete 21 Anticorrosion sheet | seat which consists of synthetic resin materials (A) 201 Anticorrosion protection surface 22 Hole 23 Adhesive

Claims (5)

A hole in the concrete is penetrated through the synthetic resin material on the anticorrosion protection surface on the anticorrosion protection surface coated with the synthetic resin material of the concrete structure, and the synthetic resin material on the metal core in the hole In the hardware mounting structure of the anticorrosion protection surface of the concrete structure to which the mounting portion of the hardware formed by covering is fixedly inserted and fixed,
A threaded portion formed by screwing a synthetic resin material covering the proximity position at a position adjacent to the mounting portion that protrudes from the anticorrosion protection surface in a mounted state of the hardware and is continuous with the mounting portion of the hardware. When,
A nut that is screwed into the threaded portion and has a size and shape that can shield the gap between the anticorrosion protection surface and the hardware, and is made of a synthetic resin material or coated with a synthetic resin material;
With
The nut of the hardware fixed to the anticorrosion protection surface is contacted with the anticorrosion protection surface, and the contact surface between the nut and the anticorrosion protection surface is joined in a watertight manner by fusion or via an adhesive,
An anti-corrosion protection hardware mounting structure for concrete structures. The anticorrosion protection surface of the concrete structure that is anticorrosion-coated with the synthetic resin material is penetrated through the synthetic resin material of the anticorrosion protection surface and a hole is made in the concrete, and the metal core material is covered with the synthetic resin material in the hole In the hardware mounting method of the anticorrosion protective surface of the concrete structure to which the mounting portion of the hardware is inserted and fixed,
A screw is provided by cutting a screw on a synthetic resin material covering the proximity position at a position adjacent to the attachment portion protruding from the anticorrosion protection surface in the attached state of the hardware in a state where the hardware is attached,
Attach a nut made of a synthetic resin material or coated with a synthetic resin material to the screw portion, having a size and shape that can shield the gap between the anticorrosion protection surface and the hardware,
After fixing the hardware to the anticorrosion protective surface,
The nut is brought into contact with the anticorrosion protection surface, and the contact surface between the nut and the anticorrosion protection surface is joined in a watertight manner by fusion or via an adhesive,
A method for attaching hardware to an anti-corrosion protective surface of a concrete structure characterized by the above.   The nut is formed or covered with a synthetic resin material that is the same as or different from the synthetic resin material of the anticorrosion protection surface that is suitable for thermal welding or ultrasonic welding on the anticorrosion protection surface, and the nut is thermally welded or superposed on the anticorrosion protection surface. The metal attachment method of the anticorrosion protection surface of a concrete structure of Claim 3 fused by sonic welding.   A nut is formed or covered with a synthetic resin material that is the same as or different from the synthetic resin material of the anticorrosion protection surface that is adapted to adhere to the anticorrosion protection surface with a predetermined adhesive, and the nut is adhered to the anticorrosion protection surface with the predetermined adhesion The metal attachment method of the anticorrosion protection surface of the concrete structure of Claim 3 which adhere | attaches via an agent.   5. The method of mounting a metal on a corrosion-protecting protective surface of a concrete structure according to claim 3 or 4, wherein a sealing material is interposed between the nut and the threaded portion of the hardware to seal the gap between the nut and the threaded portion in a watertight manner.

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