JP2005290725A - Method of setting anti-corrosion lining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of setting anti-corrosion lining not only on a sideways-facing surface but also on a downward-facing surface such as a ceiling, without using timbering. <P>SOLUTION: According to the method, support members 15 are arranged on an existing concrete surface so as to project from the surface by a predetermined length, and at least a projection end 15a of each support member is formed of an iron-containing metal or a magnetic body, followed by bonding a cement-containing composition to the existing concrete surface such that the projection end is substantially exposed to a surface of the cement-containing composition 11. Then a plate-like anti-corrosion member 12 having protrusions is pressed to the cement-containing composition before hardening to embed and bond the protrusions 12b into the cement-containing composition, and magnets 16 are arranged on an external surface of the plate-like anti-corrosion member at locations opposed to the projection ends of the support member, respectively, to thereby fix the plate-like anti-corrosion member by an adsorption force due to a magnetic force between the magnets and the iron-containing metal or the magnetic body at the projection ends. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for constructing a corrosion-resistant lining on an existing concrete surface formed downward or sideways.

  The concrete structure of sewerage facilities may be corroded by carbonic acid, hydrogen sulfide or sulfuric acid generated from sewage, and in order to prevent deterioration due to this corrosion or to repair the deteriorated part, a corrosion-resistant lining should be provided on the concrete surface. There is.

  The applicant of the present application has already acquired Japanese Patent No. 2857664 for such a method for applying a corrosion-resistant lining. In the patent publication (Patent Document 1), a cementitious material composition is adhered to an existing concrete surface formed downward or sideways, and the surface is smoothed. Before solidifying the cementitious material composition, A method of constructing a corrosion-resistant lining is described in which an anti-corrosive member is anchored by being pressed against the surface of a cementitious material composition in such a manner that anchors implanted on the back surface are embedded in the cementitious material composition. Further, the plate-like corrosion-resistant member is configured such that the anchor on the back surface has a root portion and a head protruding at the tip, and the projected area of the head does not exceed twice the projected area of the root portion. .

Japanese Patent No. 2857643

  In the construction method of the corrosion-resistant lining of Patent Document 1, on the existing concrete surface formed sideways, that is, on the side wall surface, the cementitious material composition adheres to the existing wall surface and becomes self-supporting. Since the material composition is bitten and supported, construction without support work is possible. However, on the downward surface of the ceiling or the like, the plate-like corrosion-resistant member must be supported from below by support for about 8 hours until the cementitious material composition is cured. Therefore, troublesome work is required to install the support work, and there is a problem that the work space is restricted by the support work or there is not enough space for installing the support work.

  In view of the above problems, an object of the present invention is to provide a construction method capable of providing a corrosion-resistant lining not only on a laterally facing surface but also on a downwardly facing surface such as a ceiling without using a supporting work. .

In order to solve the above problems, the present invention is a method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways, wherein a support member is provided so as to project a predetermined length from the existing concrete surface, and the support is provided. At least the projecting end of the member is made of iron-containing metal or magnetic material, and the cement-containing composition is attached to the existing concrete surface so that the projecting end of the support member substantially appears on the surface of the cement-containing composition. A plate-shaped corrosion-resistant member having a protruding portion is pressed against the cement-containing composition before solidification, and the protruding portion is embedded in the cement-containing composition and adhered, and the support member on the outer surface of the plate-shaped corrosion-resistant member A magnet is arranged at a position opposite to the protruding end, and the plate-like corrosion-resistant member is attached by the magnetic force between the magnetic body and the iron-containing metal or magnetic body at the protruding end of the support member. Provides a construction method for corrosion resistant lining, characterized by a constant.
In the present invention, the tip of the support member protruding from the surface of the existing concrete is made of an iron-containing metal or a magnetic material, and a magnet is attached to the outer surface of the plate-like corrosion-resistant member so as to face the tip of the support member. Since the plate-like corrosion-resistant member is fixed until the cement-containing composition is cured by the adsorptive force between the contained metal or magnetic substance and the magnet, even when a corrosion-resistant lining is provided on the downward surface of the ceiling or the like, It is no longer necessary to provide a conventional support work, eliminating the troublesome work of installing the support work, and also enabling corrosion-resistant lining in places where there is not enough space.

In the present invention, a method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways, a support member is provided so as to protrude a predetermined length from the existing concrete surface, and a suction cup is provided at the protruding end of the support member, By adhering the cement-containing composition to the surface of the existing concrete so that the sucker substantially appears on the surface of the cement-containing composition, the plate-shaped corrosion-resistant member having the protrusions is pressed against the cement-containing composition before solidification. A method of applying a corrosion-resistant lining, wherein the protruding portion is embedded in a cement-containing composition and the suction cup is adsorbed on a flat back surface of the plate-like corrosion-resistant member to fix the plate-like corrosion-resistant member. provide.
In the present invention, a suction cup is provided at the tip of the support member protruding from the surface of the existing concrete, and the suction cup is adsorbed to a flat portion on the back surface of the plate-like corrosion-resistant member, whereby the cement-containing composition is uncured. However, since the reaction force for supporting the plate-like corrosion-resistant member is ensured, it is not necessary to provide a conventional support work, so that the troublesome work of installing the support work is eliminated, and there is no room in the construction space. Corrosion-resistant lining is also possible at various locations.

Further, in the present invention, a method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways, wherein a support member is provided so as to protrude a predetermined length from the existing concrete surface, and a connecting member is provided at the protruding end of the support member. After the engagement, the cement-containing composition is attached to the surface of the existing concrete, and the plate-like corrosion-resistant member having the protruding portion is pressed against the cement-containing composition before solidification, and a part of the protruding portion is connected to the connecting member. And providing the corrosion-resistant lining construction method, wherein the plate-like corrosion-resistant member is fixed by embedding the remaining portion of the protruding portion in the cement-containing composition and sticking it. .
In the present invention, the connecting member is engaged with both the front end of the support member protruding from the surface of the existing concrete and the protruding portion on the back surface of the plate-like corrosion-resistant member, whereby the cement-containing composition is uncured. However, since the reaction force for supporting the plate-like corrosion-resistant member is ensured, it is not necessary to provide a conventional support work, so that the troublesome work of installing the support work is eliminated, and there is no room in the construction space. Corrosion-resistant lining is also possible at various locations.

According to the present invention, it is possible to provide a corrosion-resistant lining not only on a lateral surface but also on a downward surface such as a ceiling without using a support.
That is, in repair work such as sewers, construction is often performed while flowing sewage, and therefore, there was a case where a scaffold could not be provided and supported, but if the construction method of the present invention was used, such a problem would occur. Can also be solved. Even when the sewage can only be stopped for a few hours, the construction method of the present invention can be used to attach the plate-shaped corrosion-resistant member without waiting for the cement-containing composition to solidify, so that the construction can be performed quickly. Became possible.

Hereinafter, although it demonstrates with reference to an Example, this invention is not limited to this.
The present invention is a method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways. FIG. 1 is a cross-sectional view of a sewage pipe after a corrosion-resistant lining is provided by this construction method.
In FIG. 1, a sewer pipe is formed from a box culvert 100, a cement-containing composition 11 is attached to the ceiling and side walls, and a plate-like corrosion-resistant member 12 is provided on the surface of the cement-containing composition 11.

  FIG. 2 is a cross-sectional view of a repair location where the plate-like corrosion-resistant member 12 is temporarily fixed by a magnet. With reference to this FIG. 2, the repair method of the box culvert 100 is demonstrated in detail.

(1) Removal of deteriorated portion When repairing an existing box culvert 100, first, a portion deteriorated by hydrogen sulfide, sulfuric acid or the like is removed.

(2) Attaching the wire mesh After removing the deteriorated portion, the wire mesh 13 is placed on the existing concrete surface 14, and anchors 15 are driven into the existing concrete surface 14 at a rate of about four per square meter to fix the wire mesh 13. . The anchor 15 is provided with a nut or the like so that the wire mesh 13 can be fixed in the middle of the portion protruding from the existing concrete surface 14. The anchor 15 is made of at least a tip 15a formed of iron, an iron-containing metal, or a magnetic material and has a length that allows the tip 15a to reach the surface of the cement-containing composition 11.

(3) Spraying of cement-containing composition When the installation of the wire mesh 13 by the anchor 15 is completed, the cement-containing composition is sprayed onto the existing concrete surface 14, and the surface is pressed with a scissors to finish it smoothly. When pressing with the scissors, adjustment is made so that the tip 15a of the anchor 15 appears on the surface of the cement-containing composition 11. Here, as the cement-containing composition 11, a conventional cement mortar, a cement mortar mixed with an antibacterial agent, or a cement mortar mixed with synthetic resin short fibers can be used.

(4) Attaching the plate-like corrosion-resistant member When the surface finish of the cement-containing composition 11 is finished, the plate-like corrosion-resistant member 12 is pasted before the cement-containing composition 11 is solidified, and the surface of the plate-like corrosion-resistant member 12 A magnet 16 is attached at a position facing the tip 15a of the anchor 15 in FIG. The magnet 16 is attracted to the tip 15a of the anchor 15 across the plate-like portion 12a of the plate-like corrosion-resistant member 12, and the plate-like corrosion-resistant member 12 is temporarily fixed by this attraction force. Next, the cement-containing composition 11 is vibrated from the surface of the plate-like corrosion-resistant member 12 by a vibrator, so that the cement-containing composition 11 is densely filled between the plate-like corrosion-resistant member 12 and the existing concrete surface 14.
Here, as the magnet 16, it is possible to use a ferrite magnet, a neodymium magnet, or an electromagnet. For example, in a neodymium magnet, the length x width x thickness is 10 x 14 x 6 mm, and can exert an attractive force of 1.5 kg via the plate-like portion 12 a having a thickness of 2 mm. The member 12 can be temporarily fixed. If the same neodymium magnet is provided at the tip 15a of the anchor 15, the attractive force is doubled, so that the plate-like corrosion-resistant member 12 is more reliably fixed.
The plate-like corrosion-resistant member 12 is formed in a sheet shape from a synthetic resin having chemical resistance such as high-density polyethylene and vinyl chloride, and uses a plate-like portion 12a with a large number of protruding portions 12b planted on the back surface. . As shown in FIG. 2, the projecting portion 12b includes a columnar base portion 12c and a disc-shaped head portion 12d projecting from the tip thereof. Note that the shape of the protrusion provided on the plate-like corrosion-resistant member 12 is not limited to that shown in FIG. 2, but may be a shape that can exhibit a certain degree of fixing force when embedded in the cement-containing composition 11. It ’s fine.

(5) Removal of magnet When the cement-containing composition 11 is solidified and the fixing force with the plate-like corrosion-resistant member 12 reaches a certain level, the magnet 16 is removed from the surface and collected. If the joints are welded with the same quality material after the plurality of plate-like corrosion-resistant members 12 are attached, the repair work for the box culvert 100 is completed.

FIG. 3 is a cross-sectional view showing an embodiment in which the plate-like corrosion-resistant member 12 is fixed using a suction cup 17 instead of the magnet in FIG. With reference to FIG. 3, only differences from the repair method of FIG. 2 will be described.
After the anchor 15 is driven into the existing concrete surface 14, the suction cup 17 is fixed to the tip 15a. Then, in the step of spraying the cement-containing composition, the surface is smoothed with a scissors so that the suction cup 17 appears on the surface of the cement-containing composition 11. Next, in the step of attaching the plate-like corrosion-resistant member, the plate-like corrosion-resistant member 12 is temporarily fixed by adsorbing the suction cup 17 to a flat portion on the back surface of the plate-like corrosion-resistant member 12. The suction cup 17 is embedded in the cement-containing composition 11 as it is after the cement-containing composition 11 is solidified.

4 is a cross-sectional view showing an embodiment in which the plate-like corrosion-resistant member 12 is fixed using a connecting member 18 instead of the magnet in FIG. 2, and FIG. 5 is an enlarged cross-sectional view of the connecting member 18. Only differences from the repair method of FIG. 2 will be described with reference to FIG.
After the anchor 15 is driven into the existing concrete surface 14, the connecting member 18 is attached to the tip 15a. Here, unlike FIG.2 and FIG.3, the front-end | tip 15a of the anchor 15 is formed larger in diameter than the shaft part. The connecting member 18 is made of an elastic material such as rubber, and has a through hole 18a at the substantially center. When the tip 15a of the anchor 15 is inserted into the through hole 18a, the connecting member 18 is slightly expanded, and it is difficult to remove after insertion. It shrinks slightly. Then, in the step of spraying the cement-containing composition, the surface is smoothed with a ridge so that the connecting member 18 appears on the surface of the cement-containing composition 11. Next, in the step of attaching the plate-like corrosion-resistant member, the projection-like portion 12 b of the plate-like corrosion-resistant member 12 is inserted into the through hole 18 a of the connecting member 18, thereby temporarily fixing the plate-like corrosion-resistant member 12. The connecting member 18 is also embedded in the cement-containing composition 11 as it is after the cement-containing composition 11 is solidified.

  As described above, in the embodiment described with reference to FIGS. 2 to 4, three examples of temporarily fixing the plate-like corrosion-resistant member 12 using the magnet 16, the suction cup 17, and the connecting member 18 are shown. If necessary, it is possible to carry out a combination of these two, or a combination of all three.

It is sectional drawing of the sewer pipe after implementing the construction method of the corrosion-resistant lining of this invention. It is sectional drawing which shows the state by which the plate-shaped corrosion-resistant member was temporarily fixed with the magnet. It is sectional drawing which changed to the magnet of FIG. 2 and showed the example which fixes a plate-shaped corrosion-resistant member using a suction cup. It is sectional drawing which changed to the magnet of FIG. 2, and showed the example which fixes a plate-shaped corrosion-resistant member using a connection member. It is an expanded sectional view of a connection member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Cement containing composition 12 Plate-shaped corrosion-resistant member 12b Protrusion part 15 Anchor (support member)
16 Magnet 17 Suction cup 18 Connecting member

Claims (3)

A method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways,
A support member is provided so as to protrude from the surface of the existing concrete by a predetermined length, and at least the protruding end of the support member is made of an iron-containing metal or a magnetic material, and a cement-containing composition is attached to the surface of the existing concrete to With the protruding end substantially appearing on the surface of the cement-containing composition, the plate-like corrosion-resistant member having the protruding portion is pressed against the cement-containing composition before solidification, and the protruding portion is embedded in the cement-containing composition. The magnet is disposed at a position opposite to the protruding end of the support member on the outer surface of the plate-like corrosion-resistant member, and is attracted by a magnetic force between the magnet and the iron-containing metal or magnetic body at the protruding end of the support member. A construction method for a corrosion-resistant lining, wherein the plate-like corrosion-resistant member is fixed by force. A method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways,
A support member is provided so as to protrude from the surface of the existing concrete for a predetermined length, a suction cup is provided at the protruding end of the support member, and the cement-containing composition is adhered to the surface of the existing concrete so that the suction cup is substantially on the surface of the cement-containing composition. The plate-like corrosion-resistant member having a protrusion is pressed against the cement-containing composition before solidification so that the protrusion is embedded in the cement-containing composition and the suction cup is flattened on the plate-like corrosion-resistant member. A method for constructing a corrosion-resistant lining, wherein the plate-like corrosion-resistant member is fixed by adsorbing it to a back surface. A method of providing a corrosion-resistant lining on an existing concrete surface formed downward or sideways,
A support member is provided so as to protrude from the surface of the existing concrete for a predetermined length, and after engaging the connecting member with the protruding end of the support member, the cement-containing composition is adhered to the surface of the existing concrete, and the plate-like corrosion-resistant member having the protrusion is provided. The member is pressed against the cement-containing composition before solidification, and a part of the protruding portion is engaged with the connecting member, and the remaining portion of the protruding portion is embedded in the cement-containing composition and attached. By doing this, the said plate-shaped corrosion-resistant member is fixed, The construction method of the corrosion-resistant lining characterized by the above-mentioned.

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