JP2016030897A - Earthquake-resistant manhole repair method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake-resistant manhole repair method capable of absorbing a stress exerted by an earthquake on a manhole, eliminating a need to increase a repair layer thickness and minimizing narrowing of a space after repair.SOLUTION: An earthquake-resistant manhole repair method is for a manhole 1 having concrete side lumps 2 and 2 laminated. After removing a deteriorated concrete layer on an inner peripheral side entirely along the circumference, a repair layer 6 is formed by applying or casting a resin-based or cement-based repair material 5 on a concrete surface after removing the deteriorated layer, in such a way as to have a separation gap 4 of a prescribed width formed in a ring-form along and over a connecting part 3 between the laminated concrete side lumps 2 and 2. Then, an elastic adhesive 10 is filled into the separation gap 4 formed in the repair layer 6, for forming an elastic adhesive layer 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for repairing manholes corresponding to an earthquake in a manhole having a structure in which concrete side blocks are laminated.

  Human holes are generally made of concrete, and deterioration due to internal corrosion caused by hydrogen sulfide generated in sewer pipes or sulfur oxides in rainwater, or fatigue due to the load of the traveling vehicle is inevitable. It has become. These manholes are repaired on the inner peripheral surface at an appropriate time, and the conventional manhole repair is to remove the deteriorated part of the concrete and to remove the cement-based repair material on the concrete surface after the removal. Repairs to be integrated with the concrete frame (for example, see Non-Patent Document 1), the inner wall surface that has deteriorated the manhole is shaved, and a concrete panel that is divided into a plurality of circular shapes is simply placed along the inner wall surface in the manhole. After assembling in one or more stages, repair is performed by filling the gap between the inner wall surface and the inner wall surface of the manhole and the gap between the adjacent concrete panels with a resin adhesive such as acid-resistant mortar or vinyl chloride (for example, Patent Document 1) Or a plastic thin repair material is placed in the manhole so as to cover the inner wall surface of the manhole with a gap, and then the gap is formed between the inner wall surface and the repair material. Carboxymethyl resins, acrylic resins, repairing cured by filling one of the liquid lining for cold-curing infusate unsaturated polyester resins (e.g., see Patent Document 2.) It is known.

Corrosion control technology and anti-corrosion technology manual for sewer concrete structures (Japan Sewerage Corporation, April 2012)

JP 2007-285066 A Japanese Patent No. 2687069

Many of the human holes currently being constructed are laminated with concrete side blocks divided into a plurality of top and bottom, and when an earthquake occurs, the stress applied to the human holes due to the earthquake is reduced by the displacement of the joints of the concrete side blocks. The structure is earthquake resistant to avoid destruction.
When the repair described in Non-Patent Document 1, Patent Documents 1 and 2 is performed on the inner surface of a human hole having such an earthquake-resistant structure, the repair layer formed on the inner surface of the human hole becomes a rigid body, and the human hole is earthquake-resistant. It will disappear in the structure. As a result, when stress due to an earthquake is applied to the repaired human hole, the human hole cannot withstand the stress and may be destroyed.
For this reason, in order to ensure seismic resistance, it is necessary that the strength of the manhole after repair be strong enough to withstand the stress applied to the manhole due to the earthquake. To that end, the thickness of the repair layer must be increased. Will have to do. However, increasing the thickness of the repair layer causes a reduction in the space of manholes, and there is an inevitable problem that the function of manholes for maintaining and managing sewerage is reduced.

  The object of the present invention is to make it possible to absorb the stress applied to the manhole due to the earthquake, so that it is not necessary to increase the thickness of the repair layer, and to reduce the space reduction after repair as much as possible. It relates to the hole repair method.

  In order to achieve the above object, the invention according to claim 1 is a method for repairing an earthquake-resistant manhole in a manhole having a structure in which concrete side blocks are laminated, wherein the deteriorated layer of concrete on the inner circumference side In order to form a ring-shaped clearance gap with a predetermined width across the joint portion of the laminated concrete side block on the concrete surface after removing the deteriorated layer in a ring shape along the joint portion, A repair layer is formed by applying or placing a cement-based repair material, and an elastic adhesive layer is formed by filling the edge-cut gap formed in the repair layer with an elastic adhesive.

  According to a second aspect of the present invention, in the edge gap formed in the repair layer according to the first aspect, the joint portion of the concrete side block laminated on the concrete surface after the deterioration layer is removed. A repair layer is formed by applying or placing the repair material across a predetermined width across the substrate, and a groove portion is formed in the repair layer at an uncoated portion, and the groove portion serves as the edge cutting gap.

  The invention according to claim 3 has a predetermined width so as to straddle the joint portion of the laminated concrete side blocks in the edge cutting gap formed in the repair layer according to claim 1. A spacer is arranged in a ring shape along the joint of the concrete side block, and then the repair material is applied or placed to form the repair layer, and then the spacer is removed to form a groove. The groove portion serves as the edge cutting gap.

  According to a fourth aspect of the present invention, in the edge cutting gap formed in the repair layer according to the first aspect, a mark indicating the joint portion of the concrete side block is provided on the inner peripheral surface of the manhole. Protruding on the inner peripheral side, and then applying or placing a repair material to form the repair layer so that the mark can be confirmed, then, based on the mark, from the repair layer, A groove is formed by cutting in a ring shape along the joint by a predetermined width straddling the joint of the concrete side block, and the groove serves as the edge cutting gap.

  The invention according to claim 5 is an earthquake-compatible manhole repair method for a manhole having a structure in which the concrete side blocks are laminated according to any one of claims 1 to 4, and is an inner peripheral side concrete. After removing the deteriorated layer over the entire circumference, before applying the repair material, a peripheral groove portion opened in the planned formation area of the edge cutting gap is formed in the joint portion of the concrete side block, and the edge cutting gap is formed. After the formation, the elastic adhesive layer is formed by filling the edge cutting gap and the circumferential groove with the elastic adhesive material.

According to the earthquake-ready manhole repair method according to claim 1, the deteriorated layer of concrete on the inner peripheral side of the manhole having a structure in which concrete side blocks are laminated is removed over the entire periphery, and the concrete after the deteriorated layer is removed Apply or place a resin-based or cement-based repair material on the surface so as to form a ring-shaped clearance gap with a predetermined width across the joint portion of the laminated concrete side block. A repair layer is formed, and an elastic adhesive layer is formed by filling the edge-cut gap formed in the repair layer with an elastic adhesive layer. Therefore, a repair material is applied or placed on the inner peripheral surface of the deteriorated human hole. It can be repaired by the repair layer formed by this.
In addition, the hardened and hardened repair layer is edged by the elastic adhesive layer at the joints of the laminated concrete side blocks, so that when the concrete side blocks are stressed by an earthquake, they are elastic. The adhesive layer stretches to allow the horizontal or vertical displacement of the joints of the concrete side block, and the concrete side block is displaced together with the repair layer, which causes the earthquake stress acting on the manhole side block. In addition, it is possible to prevent the repair layer from being destroyed, and furthermore, the elastic adhesive layer can prevent inflow of earth and sand and water into the human hole due to the displacement of the joint portion of the concrete side block.
In addition, the thickness of the repair layer only needs to obtain the initial strength of the human hole as the strength of the repaired human hole, and does not require the strength to withstand the stress applied to the human hole due to an earthquake. The thickness can be reduced, repair can be performed without reducing the space of the human hole, and cost can be reduced.

  According to the earthquake-ready manhole repair method according to claim 2, the edge cut gap formed in the repair layer according to claim 1 is laminated on the concrete surface after removal of the deteriorated layer. A repair layer is formed by applying or placing the repair material with a predetermined width across the joint portion of the concrete side block, and a groove portion is formed in the repair layer at an uncoated portion. Therefore, the edge cutting gap can be easily formed.

  According to the earthquake-ready manhole repair method according to claim 3, in the edge cut gap formed in the repair layer according to claim 1, it straddles the joint portion of the stacked concrete side blocks. As described above, a spacer having a predetermined width is arranged in a ring shape along the joint portion of the concrete side block, and thereafter, the repair material is applied or placed to form the repair layer, and then the spacer is Removing and forming a groove portion, and the groove portion as the edge cutting gap, the edge cutting gap can be formed accurately and easily, and the spacer can also be used as a leveler of the repair layer, The repair material can be easily applied or placed.

  According to the earthquake-ready manhole repair method according to claim 4, in the edge-cut gap formed in the repair layer according to claim 1, the concrete side block is formed on the inner peripheral surface of the manhole. A mark indicating the joint portion is provided so as to protrude to the inner peripheral side, and thereafter, a repair material is applied or placed to form the repair layer so that the mark can be confirmed, and then based on the mark. The groove portion is formed by cutting the repair layer into a ring shape along the joint portion by a predetermined width across the joint portion of the concrete side block, and the groove portion serves as the edge cutting gap. The gap can be formed accurately and easily.

  According to the earthquake-ready manhole repair method according to claim 5, the earthquake-ready manhole repair method according to any one of claims 1 to 4 in a manhole having a structure in which the concrete side blocks are laminated. Then, after removing the deteriorated layer of the concrete on the inner peripheral side over the entire circumference, before applying the repair material, a peripheral groove portion opening in the planned formation area of the edge cutting gap is formed in the joint portion of the concrete side block. In addition, since the elastic adhesive layer is formed by filling the edge gap and the circumferential groove portion with the elastic adhesive material after forming the edge gap, the elastic adhesive material filled in the circumferential groove portion is formed. As a result, the amount of elongation of the elastic adhesive layer increases, and the range that can cope with displacement due to an earthquake can be expanded.

It is a longitudinal cross-sectional view of the manhole which implemented the 1st example of embodiment of the earthquake corresponding manhole repair construction method which concerns on this invention. It is sectional explanatory drawing which shows an example of the process of forming the edge notch gap formed in the repair layer implemented in a 1st example. (A), (B), and (C) are cross-sectional explanatory views showing other examples of the step of forming the edge cut gap formed in the repair layer performed in the first example. (A), (B), and (C) are cross-sectional explanatory views showing other examples of the step of forming the edge cut gap formed in the repair layer performed in the first example. It is explanatory drawing which shows the displacement to the horizontal direction of the junction part of the concrete side block with which the human hole was laminated | stacked which implemented the 1st example, and the elongation of the elastic adhesive layer accompanying a displacement. It is a principal part expansion longitudinal cross-sectional view of the manhole which implemented the 2nd example of embodiment of the embodiment of the earthquake corresponding manhole repair method which concerns on this invention. It is sectional explanatory drawing which shows the process of forming the circumferential groove part opened in the junction formation part of a concrete side lump in the scheduled formation area of a margin cutting gap.

Hereinafter, the form for implementing the earthquake corresponding manhole repair method concerning this invention is demonstrated in detail.
FIG. 1 to FIG. 4 show a first example of an embodiment of an earthquake-responsive manhole repair method according to the present invention, FIG. 1 is a longitudinal sectional view of a manhole in which the first example is implemented, and FIG. Cross-sectional explanatory drawing which shows an example of the process of forming the edge-cutting gap formed in the repair layer implemented in one example, FIGS. 3 (a), (b), and (c) are the repair layer implemented in the first example. FIGS. 4A, 4B, and 4C are cross-sectional explanatory views showing other examples of the step of forming the edge-cutting gap to be formed, and form the edge-cutting gap formed in the repair layer implemented in the first example. It is sectional explanatory drawing which shows the other example of a process.

  In this example, the manhole repair method for earthquakes first removes the deteriorated layer of concrete on the inner circumference side of the manhole 1 having a structure in which the concrete side blocks 2 and 2 divided into a plurality of upper and lower parts are laminated over the entire circumference. . The concrete deterioration layer is removed until the sound layer is exposed by high-pressure washing or chipping.

Next, on the sound concrete surface after the deterioration layer is removed, an edge-cut gap 4 having a predetermined width L1 straddling the joint 3 of the laminated concrete side blocks 2 and 2 is formed in a ring shape along the joint 3. Then, the repair layer 6 is formed by applying or placing a resin-based or cement-based repair material 5.
The means for forming the edge gap 4 in the repair layer 6 is performed as follows, but is not limited thereto.

  FIG. 2 shows an example of a means for forming the edge-cutting gap 4, and a predetermined width L1 across the joint 3 of the laminated concrete side blocks 2 and 2 is provided on the concrete surface after the deterioration layer is removed. A repair layer 6 is formed by applying or placing a repair material 5, and a groove portion 7 is formed in the repair layer 6 at an uncoated portion.

  FIGS. 3 (a), (b), and (c) show other examples of the means for forming the edge-cutting gap, and are arranged so as to straddle the joint portion 3 of the laminated concrete side blocks 2, 2. A spacer 8 having a width L1 is arranged in a ring shape along the joint 3 of the concrete side blocks 2 and 2 (FIG. 3 (a)), and thereafter a repair material 5 is applied or placed to form a repair layer 6. (FIG. 3 (b)). At this time, by using the spacer 8 as a leveler of the repair layer 6, the repair material 5 can be easily applied or placed. Then, immediately before the repair layer 6 is cured, the spacer 8 is removed to form the groove portion 7, and the groove portion 7 is used as the edge cut gap 4 (FIG. 3C).

  4 (a), (b), (c) Another example of the means for forming the edge-cutting gap is shown, and a rod-like shape showing the joint part 3 of the concrete side blocks 2, 2 on the inner peripheral surface of the human hole 1 is shown. The mark 9 is provided so as to protrude to the inner peripheral side (FIG. 4 (A)). After that, the repair material 5 is applied or placed to form the repair layer 6 so that the mark 9 can be confirmed (FIG. 4B). Thereafter, based on the mark 9, the groove 7 is formed by cutting the repair layer 6 into a ring shape along the joint 3 by a predetermined width L1 across the joint 3 of the concrete side blocks 2, 2. The groove portion 7 is used as the edge cutting gap 4 (FIG. 4C).

In the repair material 5 that forms the repair layer 6 by applying or placing it on a sound concrete surface after the deterioration layer is removed, the resin-based repair material 5 is used in this example.
In this example, a thermosetting resin or a photocurable resin is used as the resin-based repair material 5, and an epoxy resin is particularly preferable. Further, incineration ash of sewage sludge may be added as a filler to the epoxy resin. By adding incineration ash of sewage sludge as a filler, resource saving from the aspect of using incineration ash of sewage sludge can be achieved.

Further, the repairing material 5 in the resin system, tensile strength 8.0 N / mm ² or more, the adhesion strength is 2.0 N / mm ² or more, compressive strength 45.0N / mm ² or more, the elastic modulus 3200N / mm ² The above is preferable. By using such a resin-based repair material 5, the initial thickness of the human hole 1 is increased by the repair layer 6 formed by applying the resin-based repair material 5 to the concrete surface after removing the deteriorated layer. As a result, a fracture load equal to or greater than the initial fracture load can be obtained as the fracture load of the human hole 1 after repair, and as a result, it is possible to repair without reducing the space of the human hole 1 It becomes.

Next, the elastic adhesive layer 11 is formed by filling the edge gap 4 formed in the repair layer 6 with the elastic adhesive 10 as described above.
In the elastic adhesive 10 that fills the edge gap 4, a thermosetting resin such as an elastic epoxy resin, a silicone elastomer, a rubber filler, or a polyurea is used. An elastic epoxy resin is preferable from the viewpoint of followability, chemical resistance, and water resistance. In this example, an elastic epoxy resin is used as the elastic adhesive 10.

  According to the earthquake repair manhole repair method of the first example, the deteriorated layer of concrete on the inner peripheral side of the manhole 1 having a structure in which the concrete side blocks 2 and 2 are laminated is removed over the entire circumference, and the deteriorated layer is removed. The repair material 5 is applied so that a marginal gap 4 having a predetermined width L1 straddling the joint portion 3 of the laminated concrete side blocks 2 and 2 is formed in a ring shape along the joint portion 3 on the concrete surface after The repair layer 6 is formed, and the elastic adhesive layer 11 is formed by filling the edge gap 4 formed in the repair layer 6 with the elastic adhesive layer 11, so that the inner peripheral surface of the deteriorated human hole 1 is formed by the repair layer 11. Repaired.

  Moreover, since the repair layer 11 that has been hardened and hardened is edge-cut by the elastic adhesive layer 11 at the position of the joint 3 of the laminated concrete side blocks 2, 2, the concrete side block 2, When the stress in the horizontal direction or the vertical direction is applied to 2, the elastic adhesive layer 11 extends to allow the joint 3 of the concrete side blocks 2 and 2 to be displaced, and the concrete side blocks 2 and 2 are connected to the repair layer 11. As a result, they can be displaced together (see FIG. 5), thereby reducing the stress of the earthquake acting on the concrete side blocks 2 and 2, and preventing the repair layer 11 from being broken. Furthermore, the elastic adhesive layer 11, the inflow of earth and sand and water into the human hole due to the displacement of the joint portion 3 of the concrete side blocks 2 and 2 can be prevented.

  Further, the thickness of the repair layer 11 is not limited as long as the initial strength of the human hole 1 can be obtained as the strength of the human hole 1 after repair, and the strength to withstand the stress applied to the human hole 1 due to an earthquake is not required. The thickness of the repair layer 11 can be reduced, the repair can be performed without reducing the space of the human hole 1, and the cost can be reduced.

6 and 7 show a second example of the embodiment of the earthquake-responsive manhole repair method according to the present invention, and FIG. 6 is an enlarged longitudinal sectional view of a main part of the manhole in which the second example is implemented. 7 is a cross-sectional explanatory view showing a step of forming a circumferential groove portion that opens in a planned formation region of the edge cutting gap at the joint portion of the concrete side block.
The earthquake corresponding manhole repair method of this example is not different from the first example in the basic configuration, the same configuration as the first example is denoted by the same reference numeral, and the description of the first example is used for the details. To do.

  In this example, the manhole repair method corresponding to the earthquake first, like the first example, all the deteriorated layers of concrete on the inner peripheral side of the manhole 1 having a structure in which the concrete side blocks 2 and 2 divided into a plurality of upper and lower parts are laminated are stacked. Remove over the lap. The concrete deterioration layer is removed until the sound layer is exposed by high-pressure washing or chipping.

Next, the circumferential groove part 12 opened in the scheduled formation area of the edge-cutting gap 4 formed in a subsequent process is formed in the joint part 3 of the concrete side blocks 2 and 2.
The circumferential groove 12 has a depth L2 from the inner peripheral side of the concrete side blocks 2 and 2 to a predetermined position in a range not exceeding the outer peripheral wall surface, and the height direction of the joint portion 3 of the concrete side blocks 2 and 2. It is formed by cutting along the joint 3 with a width L3 in a range not exceeding the width L1 of the edge-cutting gap 4.

Next, an edge-cut gap 4 having a predetermined width L1 straddling the joint portion 3 of the laminated concrete side blocks 2, 2 is joined to the concrete surface in which the circumferential groove portion 12 is formed in the joint portion 3 of the concrete side blocks 2, 2. The repair layer 6 is formed by applying or placing a resin-based or cement-based repair material 5 so as to form a ring shape along the surface 3.
The means for forming the edge-cutting gap 4 in the repair layer 6 is the same as in the first example, so the description of the first example is cited.
Moreover, since it is the same as that of a 1st example also in the repair material 5 which forms the repair layer 6 by apply | coating or placing on a concrete surface, description of a 1st example is used.

Next, the elastic adhesive material 10 is filled into the peripheral groove portion 12 formed in the joint gap 3 between the edge cut gap 4 and the concrete side block 2 and 2 formed in the repair layer 6 as described above. Layer 11 is formed.
The elastic adhesive 10 that fills the edge-cutting gap 4 and the circumferential groove 12 is the same as the first example, so the description of the first example is cited.

According to the above-mentioned second example of the earthquake repair manhole repair method, after removing the deterioration layer of the concrete on the inner peripheral side over the entire periphery, and before applying the repair material 5, the joint portion of the concrete side blocks 2, 2 3 is formed with a circumferential groove portion 12 that opens in a predetermined formation area of the edge-cutting gap 4, and after the edge-cutting gap 4 is formed, the elastic adhesive material 10 is filled into the edge-cutting gap 4 and the circumferential groove portion 12 to form an elastic adhesive layer. 11 is formed, the amount of the elastic adhesive material 10 filled in the circumferential groove portion 12 increases the amount of elongation of the elastic adhesive layer 11, and the range that can cope with displacement due to an earthquake can be expanded.
Other operational effects are the same as those of the first example described above, and thus the description of the first example is cited.

  In both the first example and the second example, the resin-based repair material 5 is used as the repair material 5, but a cement-based repair material 5 may be used.

DESCRIPTION OF SYMBOLS 1 Human hole 2 Concrete side block 3 Joint part 4 Edge cutting gap 5 Repair material 6 Repair layer 7 Groove part 8 Spacer 9 Mark 10 Elastic adhesive 11 Elastic adhesive layer
12 Circumferential groove

Claims (5)

  This is a method for repairing manholes in an earthquake that has a structure in which concrete side lumps are laminated, and the degraded layer of the concrete on the inner circumference side is removed over the entire circumference, and the concrete layer after the degraded layer is removed A repair layer is formed by applying or placing a resin-based or cement-based repair material so as to form a ring-shaped clearance gap with a predetermined width across the joint portion of the concrete side block, An earthquake-responsive manhole repair method, wherein an elastic adhesive layer is formed by filling an elastic adhesive into the edge-cutting gap formed in the repair layer.   In the edge-cutting gap formed in the repair layer, the repair material is applied or placed on the concrete surface after removal of the deteriorated layer with a predetermined width across the joint portion of the laminated concrete side blocks. The earthquake repair manhole repair method according to claim 1, wherein a repair layer is formed, a groove portion is formed in the repair layer at an uncoated portion, and the groove portion serves as the edge-cut gap.   In the edge gap formed in the repair layer, a spacer having a predetermined width is arranged in a ring shape along the joint portion of the concrete side block so as to straddle the joint portion of the laminated concrete side block. Then, the repair material is applied or placed to form the repair layer, the spacer is then removed to form a groove, and the groove serves as the edge cutting gap. 1. Earthquake repair manhole repair method described in 1.   In the edge gap formed in the repair layer, a mark indicating the joint portion of the concrete side lump is provided on the inner peripheral surface of the human hole so as to protrude to the inner peripheral side, and thereafter, the repair material The repair layer is formed so that the mark can be confirmed by applying or placing, and then, based on the mark, from the repair layer to the joint by a predetermined width across the joint of the concrete side block. The earthquake-compatible manhole repair method according to claim 1, wherein a groove portion is formed by cutting along a ring shape along the groove, and the groove portion serves as the edge cutting gap.   A method for repairing an earthquake-resistant manhole in a manhole having a structure in which the concrete side block is laminated, and after removing the deterioration layer of the concrete on the inner circumference over the entire circumference, before applying the repair material, the concrete side In the lump joint, a circumferential groove is formed that opens in a predetermined formation area of the edge-cutting gap, and after the edge-cutting gap is formed, the elastic adhesive material is filled into the edge-cutting gap and the circumferential groove, and the elastic bonding is performed. 5. An earthquake-resistant manhole repair method according to any one of claims 1 to 4, wherein an agent layer is formed.

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