JP3845666B2 - Internal wall repair method for existing concrete structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing an inner wall surface of an existing concrete structure, such as a sewage treatment tank, in which the inner wall surface may deteriorate due to long-term use.
[0002]
[Prior art]
In existing concrete structures, such as sewage treatment tanks, manhole boxes, sewage pipes, etc., the concrete that constitutes the surface layer of the inner wall and the acid gas (for example, hydrogen sulfide gas) generated from the sewage by the embedded reinforcing bars As the strength of the concrete structure frame deteriorates as it is gradually corroded and deteriorated by contact with the steel, it will be necessary to repair and renew it during long-term use. Conventionally, such repair and renewal of the inner wall surface is generally performed by removing the deteriorated portion from the inner wall surface, then reinforcing the bar, assembling the formwork and placing the concrete, and newly replacing the concrete surface layer. Was done by building.
[0003]
[Problems to be solved by the invention]
However, in the above conventional method, not only does it take a lot of time and effort to disassemble the reinforcing bars and formwork, but also the problem is that the formwork cannot be disassembled without waiting for the curing and hardening of the concrete, resulting in a long construction period. there were. As shown in FIG. 16, a support work is taken as a measure for preventing deformation against the concrete placing pressure. In order to take the reaction force of the support material a (rigid panel, loose square, etc.) and the support material a. It was necessary to use a large amount of materials such as the support b with jack, and it took a lot of time and manpower to carry in, carry out, assemble and dismantle these materials.
[0004]
The present invention has been made for the purpose of providing an inner wall surface repair method capable of shortening the construction period and forming an anticorrosion lining layer on the inner wall surface of a concrete structure as well as omitting the application of formwork and support. It is a thing.
[0005]
[Means for Solving the Problems]
The present invention is provided with a concave and convex engagement locking portion fixed to the inner wall so as to cover the entire inner wall of the existing concrete structure to be repaired with a first backfill interval. step of assembling the porous metal reinforcing portion are porous metal plate as a component,
(B) assembling a corrosion-resistant lining portion by using a plastic plate with a back rib attached and fixed to the porous metal reinforcing portion so as to cover the entire surface of the porous metal reinforcing layer with a second backfill interval;
And an inner wall surface repair method for an existing concrete structure, wherein a backfilling material is filled in the first and second backfilling intervals.
[0006]
According to one preferred embodiment of the present invention repairing method, the first backfill spacing between the inner wall and the porous metal reinforcing portion, the steel of the installation fixed between the inner wall and the porous metal reinforcing portion Can be secured. Also it is characterized in that the second back-filling space between said porous metal reinforcing portion and the corrosion lining portion, to secure the rear rib that comes with plastic plate constituting the corrosion lining unit.
[0007]
The mounting fixed on the rear ribbed plastic plate to said porous metal reinforcing portion, be carried out by fitting engagement of the uneven fitting engagement portion of the formation into an upper on the back rib of the plastic plate and the perforated metal reinforcing portion In this case, as the concave-convex fitting and locking portion, a method of fitting and locking from the direction along the inner wall surface or a method of performing the fitting and locking from the direction toward the inner wall surface is appropriate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 8 show a situation where the repair method of the present invention is applied to repair and renewal of a vertically oriented concrete inner wall surface 1 forming a single plane. When performing this repair method, as shown in FIG. First, after removing the deteriorated portion from the concrete inner wall surface 1 to be repaired, the steel material 2 is attached and fixed to a plurality of locations on the inner wall surface 1 in parallel to the vertical direction with the anchor bolt 3 applied in the vertical direction. And the steel material 2 is extended over the full length of the up-down direction of the inner wall surface 1 in this attachment fixed state. Incidentally, you may attach and fix the steel material 2 so that it may extend in a horizontal direction (left-right direction).
[0009]
Normally, the inner wall surface 1 from which the deteriorated portion has been removed has irregularities, but by attaching and fixing the steel material 2 as described above, leveling can be performed as indicated by a virtual line 4 in FIG. Although a Z-shaped steel is shown in FIG. 1 as the steel material 2, various cross-sectional shapes to which an anchor bolt can be applied, such as an I-shaped steel, a □ -shaped steel, and a C-shaped steel, can be used.
[0010]
After finishing the attachment of the steel material 2 to the inner wall surface 1, as shown in FIG. 2, a plurality of porous metal plates 5 are laid on the steel material 2 so as to cover the entire inner wall surface 1. Each porous metal plate 5 is attached and fixed to the steel material 2 under application of welding means, for example. By laying the porous metal plate 5, a porous metal reinforcing portion 5 A is constructed so as to cover the entire inner wall surface 1. Between the porous metal reinforcing portion 5 A and the inner wall surface 1, the steel material 2 functions as a spacer. Thus, the first backfill interval 6 is formed. As the porous metal plate 5, steel punching metal, expanded metal, or the like can be applied.
[0011]
FIG. 3 shows the construction status of the porous metal reinforcing portion 5A. In the example shown in the drawing, the porous metal reinforcing portion 5A is constructed from six porous metal plates 5 (fixed dimensions, for example, 900 mm wide × 1800 mm long) arranged in parallel in the vertical and horizontal directions. However, the dimensions of the porous metal plate 5, the number of laying sheets and the like are not particularly limited, and may be appropriately selected and determined according to the situation at the construction site.
[0012]
In order to construct the corrosion-resistant lining portion 7A (see FIG. 7) on the porous metal reinforcing portion 5A, a plastic plate 7 with a back rib 8 is used as shown in a cross section in FIG. The plastic plate 7 is made of hard or semi-rigid plastic such as polyethylene (or vinyl chloride) and has an appropriate rigidity. The size of the plastic plate 7 may be the same type and the same size as the porous metal plate 5 described above, but even if a long one is used and the length necessary for construction is cut. good. The back ribs 8 extend in the longitudinal direction of the plastic plate 7 and are formed in parallel with a predetermined pitch interval in the width direction. In parallel with the back rib 8, uneven portions 9 a and 9 b for bonding are formed on both sides of the plastic plate 7. In addition, the structure of a junction part is not restrict | limited only to a present Example.
[0013]
In order to attach and fix the plastic plate 7 with the back rib 8 on the porous metal reinforcing layer 5A under the laying state, the uneven fitting locking means is applied. As the concave and convex fitting locking means, in the present embodiment, there is shown a method of fitting and locking in the direction along the porous metal reinforcing portion 5A and consequently the inner wall surface 1, and as shown in FIG. On the other hand, for example, the concave fitting locking portion 10a is formed over the entire length in the lateral direction on the porous metal reinforcing portion 5A with a pitch interval equal to or an integral multiple of the pitch interval of the back rib 8. As shown in FIG. 6, for example, a long metal piece 11 having a Z-shaped cross section is applied to form the concave fitting / engaging portion 10a. The metal piece 11 is welded on the porous metal reinforcing portion 5A at the lower end flange portion 11a. The vertically standing rib portion 11b and the upper end flange portion 11c constitute a concave fitting locking portion 10a having an upward opening. The long metal object 11 is preferably welded to the porous metal plate 5 in advance. On the other hand, as shown in FIG. 4, the convex fitting locking portion 10 b is formed on the free end side of the back rib 8 of the plastic plate 7 and protrudes in the width direction of the plastic plate 7.
[0014]
Thus, the plastic plate 7 is moved in the direction along the metal reinforcing portion 5A in a state where the plastic plate 7 is installed on the metal reinforcing portion 5A so that the concave and convex fitting locking portions 10a and 10b face each other. By fitting and locking the portions 10a and 10b, the plastic plate 7 can be mounted and fixed on the metal reinforcing portion 5A as shown in FIG. By sequentially attaching and fixing the plastic plate 7 on the metal reinforcing portion 5A in this way, the plastic plate 7 can be laid and fixed so as to cover the entire surface of the metal reinforcing portion 5A and the inner wall surface 1, and the plastic plate is fixed here. 7 can construct a corrosion-resistant lining 7A. In the anticorrosion lining portion 7A constructed in this way, the plastic plates 7 are joined to each other by fitting the concave and convex portions 9a and 9b on both sides, but are joined to each other on the other side by butting. . Appropriate sealing means (not shown) such as welding can be applied to the butt joint.
[0015]
As shown in FIG. 7, a second backfill interval 12 is formed between the porous metal reinforcing portion 5A and the anticorrosion lining portion 7A constructed as described above, based on the back rib 8, and the second backfill is formed. The interval 12 communicates with the first backfill interval 6 through the porous portion of the porous metal reinforcing layer 5A.
[0016]
After constructing the porous metal reinforcing layer 5A and then the corrosion-resistant lining portion 7A so as to cover the entire inner wall surface 1 to be repaired, the first and second backfilling intervals with a seal (not shown) on the peripheral side portion 6 and 12 is filled with a backfill material 13 such as cement milk. The injected backfill material 13 flows into the first and second backfill intervals 6 and 12 through the porous portion of the metal reinforcing portion 5A, and is filled in the backfill intervals 6 and 12 without a gap. By repairing and curing the back-filling material 13 filled in this way, the repair and update work for the inner wall surface 1 is completed.
[0017]
In the repair and update section constructed in this way, as shown in FIG. 8, the backfill material 13 filled in the first and second backfill intervals 6 and 12 is joined and integrated through the porous portion of the metal reinforcing section 5A. Since the metal reinforcing layer 5A is embedded in the layer of the backfilling material 13 in addition to substantially forming one layer, the metal reinforcing portion 5A has the same function as the reinforcing bar in the reinforced concrete structure. It is possible to construct a repair / update unit with a robust structure. In addition, since the surface layer portion of the repair / updating portion is composed of the corrosion-resistant lining portion 7A, it has a corrosion-proof structure, and measures against acid gas generated from sewage and the like are perfect, and it can withstand long-term use.
[0018]
In the repair method of the present invention, the plastic plate 7 with the back rib 8 constituting the anticorrosion lining portion 7A is firmly fixed to the perforated metal reinforcing portion 5A by fitting and locking the concave and convex fitting locking portions 10a and 10b. Since the perforated metal reinforcing portion 5A is firmly attached and fixed to the concrete inner wall surface 1 by the anchor bolt 3, the inner wall surface 1, the perforated metal reinforcing portion 5A and the corrosion-resistant lining portion 7A are integrally coupled. Thus, the strength of the corrosion-resistant lining portion 7A is enhanced by this integral connection. Therefore, the corrosion-resistant lining portion 7A can sufficiently withstand the head pressure during the placement of the backfilling material regardless of the fact that it is composed of the semi-rigid plastic plate 7 with the back rib 8. Therefore, it is also used as a mold. Therefore, it is possible to omit the application of the formwork and the construction of the support work as found in the conventional repair method.
[0019]
FIG. 9 schematically shows a state in which the repair method of the present invention is applied to repair and renewal of the inner wall surface of the sewage treatment tank A, for example, the four inner wall surfaces and the floor surface. In this case, the porous metal reinforcing portion 5A and the anticorrosion lining portion 7A are covered in the manner described above so as to cover the entire surface of the five surfaces with the first and second backfill intervals 6, 12 (see FIG. 7). After that, the backfilling may be performed within the first and second backfilling intervals 6 and 12. Incidentally, FIG. 9 schematically shows the porous metal reinforcing portion 5A and the anticorrosion lining portion 7A, and the others are omitted.
[0020]
FIG. 10 shows an example in which the repair method of the present invention is applied to repair and update the inner wall surfaces of the upper, lower, left and right four sides of the sewer pipe B with a square cross section. In this case, for example, 50 to 100 m of the pipe B The construction is carried out with the degree as one construction manager, and the first and second backfilling intervals 6, 12 are made by placing the porous metal reinforcing part 5A and the corrosion-resistant lining part 7A so as to cover the entire inner surface of the pipe wall within the range of this construction manager. (See FIG. 7), after the construction, the backfilling intervals 6 and 12 may be backfilled. FIG. 10 shows an example in which the longitudinal direction of the plastic plate 7 is made coincident with the circumferential direction of the pipe rod.
[0021]
In the repair method of the present invention, the steel material 2 may be welded and fixed to a predetermined portion of the porous metal plate 5 in advance. In this case, the fixing with the anchor bolt 3 to the inner wall surface 1 of the steel material 2 may be performed using the porous portion 15 of the porous metal plate 5 as a work port as shown in FIG. The hole for fixing the anchor bolt is drilled in the vicinity of the center of the porous portion 15 using a punching machine or the like, and then the anchor bolt 3 is inserted into the hole drilled through the porous portion 15 with the washer 14 set. The washer 14 is large enough to pass through the porous portion 15 and is composed of a flat portion 14a for pressing the steel material 2 and a protrusion 14b in contact with the inner wall surface, and the amount of protrusion is substantially the same as the thickness of the portion for fixing the steel material.
[0022]
Further, the steel material 2 and the porous metal plate 5 do not necessarily have to be fixed by applying welding means, and the steel material 2 and the porous metal plate 5 are individually fixed to the inner wall surface 1 by applying anchor bolts 3 respectively. be able to. In this case, as shown in FIG. 12, for example, an attachment hardware 16 having a bottomed cylindrical shape and having a flange portion 16 a at the upper end portion is applied to the porous metal plate 5.
[0023]
In the repair method of the present invention, as shown in FIG. 13, a method of fitting and locking to the porous metal plate 5 from the front can be adopted. In this case, as shown in FIG. 14, the concave and convex fitting locking portions 10a1 and 10b1 are the concave fitting locking portions 10a1 on the porous metal plate 5 side, and the convex fitting locking portions 10b1 are the back ribs of the plastic plate 7. 8 are formed on the free end side. The concave fitting locking portion 10a1 has projections 10a2 formed on the inner sides at both ends of the inlet opening. When the convex fitting locking portion 10b1 having a sharp tip is pushed in, the concave fitting locking portion 10a1 The entrance opening opens in both directions due to the holding elasticity. Once the convex fitting locking portion 10b1 enters the concave fitting locking portion 10a1, the protrusion 10a2 serves as a stopper because the inlet opening returns to the original position, and the convex fitting locking portion 10b1 There is no escape. In FIG. 13, uneven portions 9a1 and 9b1 for bonding are formed on both sides of the plastic plate 7, and the convex fitting locking portion 10b1 is inserted into the concave fitting locking portion 10a1 by pressing from the front. It is possible to join at the same time as fitting and locking. The pressing can be easily performed by a method such as hitting with a hammer or pressing a vibrator.
[0024]
FIG. 15 shows another embodiment of the joint structure of the plastic plate 7. Concave portions 9a1 for bonding are formed on both side portions of the plastic plate 7, and the connecting portions are connected by using a plastic member 17 for bonding in which convex portions 9b1 for bonding are formed on both side portions.
[0025]
【The invention's effect】
As described above, according to the present invention, it is possible not only to omit the application of a formwork and a support work, but also to shorten the construction period, and to form an anticorrosion lining layer on the inner wall surface of a concrete structure. Can be provided.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing an implementation status of a repair method of the present invention, and is a partial cross-sectional view showing a status where a steel material is attached to a concrete inner wall surface to be repaired.
FIG. 2 is a partial cross-sectional view showing a state in which a porous metal plate is mounted on a steel material.
FIG. 3 is a front view showing the construction status of the porous metal reinforcing part.
FIG. 4 is a cross-sectional view of a plastic plate applied to the construction of a corrosion-resistant lining.
FIG. 5 is a front view showing a situation in which a concave fitting locking portion is mounted on the porous metal reinforcing portion.
FIG. 6 is an enlarged cross-sectional view showing a mounting state of the concave fitting locking portion.
FIG. 7 is a cross-sectional view showing the construction status of the corrosion-resistant lining part.
FIG. 8 is a cross-sectional view of the repair / update unit.
FIG. 9 is a cross-sectional view schematically showing a situation in which the repair method of the present invention is applied to repair of the inner wall surface of a sewage treatment tank.
FIG. 10 is an explanatory view including a cross section schematically showing the situation applied to the repair of the inner wall surface of the sewer pipe.
FIG. 11A is a plan view showing a state in which a steel material is attached to an inner wall surface by applying a washer and an anchor bolt. (B) It is sectional drawing same as the above.
FIG. 12 (a) is a plan view showing a state in which a perforated metal plate is attached to an inner wall surface by applying attachment hardware and anchor bolts. (B) It is sectional drawing same as the above.
FIG. 13 is a cross-sectional view showing another embodiment of the concave-convex fitting locking portion.
FIG. 14 is an enlarged view of the concave-convex fitting locking portion.
FIG. 15 is a cross-sectional view showing another embodiment of the uneven joint portion.
FIG. 16 is an explanatory diagram of a conventional construction method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inner wall surface 2 Steel material 3 Anchor bolt 4 Virtual wire 5 Porous metal plate 5A Porous metal reinforcement part 6 1st backfill space | interval 7 Plastic plate 8 Back surface rib 9a Concave part 9b Joint convex part 10a Concave fitting latching part 10b Convex Fitting locking part 11 Long metal 12 Second backfilling interval 13 Backfilling material 14 Washer 15 Hole 16 of perforated metal plate Mounting bracket 17 Plastic member for joining

Claims (6)

(B) A porous metal provided with a concave and convex engagement locking portion fixed to the inner wall surface so as to cover the entire inner wall surface of the existing concrete structure to be repaired with a first backfill interval step of assembling the porous metal reinforcing portion as a component plate,
(B) assembling a corrosion-resistant lining portion by using a plastic plate with a back rib attached and fixed to the porous metal reinforcing portion so as to cover the entire surface of the porous metal reinforcing layer with a second backfill interval;
A method of repairing the inner wall surface of an existing concrete structure, wherein a backfilling material is filled in the first and second backfilling intervals. The first back-filling spacing between the inner wall and the porous metal reinforcing portion, of claim 1, wherein the securing of steel installation fixed between the inner wall and the porous metal reinforcing portion Wall surface repair method. Second the back-filling intervals, according to claim 1 or 2, wherein the securing by the rear rib that comes with plastic plate constituting the corrosion lining portion between said porous metal reinforcing portion and the corrosion lining portion Interior wall repair method. That attached and fixed on the rear ribbed plastic plate to said porous metal reinforcing portion is carried out by fitting engagement of the uneven fitting engagement portion of the formation into an upper on the back rib of the plastic plate and the perforated metal reinforcing portion The inner surface repair method according to any one of claims 1 to 3, wherein 5. The inner surface repair method according to claim 4, wherein the engagement locking of the concave / convex fitting locking portion is performed by pressing from a direction along the inner wall surface. 5. The inner surface repair method according to claim 4, wherein the engagement locking of the concave-convex engagement locking portion is performed by pressing from the direction toward the inner wall surface.

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