JPH08284194A - Repairing material for concrete structure under ground and repairing method therefor - Google Patents

Abstract

PURPOSE: To make unnecessary large-scale opencut construction, and to easily repair a damaged part in a short period, by arranging a plurality of reinforcing bars to be joined to reinforcing bars in a concrete structure under the ground at the periphery of a panel, at which the reinforcing bars protrude from the periphery of the panel at regular intervals ranging over the whole periphery of the panel. CONSTITUTION: A C-section steel bar unit is mounted on a square board member 3 with bolts, and reinforcing members 6 consisting of a pair of L-section steel bars are attached thereto so as to intersect each other parallel to diagonal lines, and thus a panel 2 is formed. A plurality of reinforcing bars 9 to be joined to reinforcing bars in a concrete structure under the ground are weld on the peripheral part of the outside of the C-section steel bar unit, ranging over the whole periphery, which bars 9 protrude from the periphery of the panel 2 toward the outside. A repairing material 1 composed of an above-mentioned way is put into a repairing material-fitting opening formed by opening the hole to be repaired on an underground structure, and the reinforcing bars 9 are welded to the reinforcing bar being left in the opening, and thus a concrete- placing framework is formed. After that, reinforcing bars are arranged in the opening and concrete is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a basement floor of a building, an underdrain,
The present invention relates to a repair material and repair method for a damaged portion of an underground concrete structure such as a common ditch.

[0002]

2. Description of the Related Art In an underground concrete structure such as a basement floor of a building, a culvert, a common ditch, etc., a damage such as a hole is locally caused by an impact from an earthquake or a nearby construction, and groundwater is discharged from the hole etc. May penetrate into. Conventionally, when such a damage occurs in an underground structure, the ground outside the building is excavated to repair the damage, and repair work is performed from the outside of the structure.

[0003]

Such a conventional repair method requires large-scale work because the ground outside the structure must be dug deep, and the repair work is difficult because of groundwater. Therefore, the construction for extracting the groundwater was also necessary, and it took a lot of time and labor to restore the building.

The present invention has been made in view of the problems of the above-mentioned conventional method, does not require a large-scale construction as in the conventional method, and does not hinder the construction even if groundwater flows. The present invention intends to provide a new method for repairing an underground structure that can be easily completed in a short period of time and a repair material used for this repair method.

[0005]

A repairing material for an underground concrete structure which achieves the above-mentioned object of the present invention is to provide a plurality of connecting reinforcing bars for connecting with reinforcing bars of an underground concrete structure at a peripheral portion of a panel. It is arranged at a predetermined interval over the entire circumference so as to project from the peripheral edge of the panel.

Further, in the method for repairing a concrete structure which achieves the above object of the present invention, the above-mentioned repair material is prepared, and the peripheral portion of the damage hole of the underground concrete structure is to be connected to the connecting reinforcing bar of the repair material. For connecting the repair material by crushing leaving a part and expanding it to the extent that the repair material can be fitted to form a repair material fitting hole, and fitting the repair material into the repair material fitting hole A reinforcing bar is welded to a reinforcing bar portion of the repair material fitting hole, and a cut-off plate is provided outside the repair material fitting hole before and after the repair material fitting hole so that the peripheral edge portion of the panel of the repair material and the repair material fitting The gap between the peripheral portion of the mounting hole was closed, and the gap between the peripheral portion of the panel of the repair material and the peripheral portion of the repair material fitting hole was filled with a quick-setting filler such as quick-setting mortar. After that, reinforcing bars are arranged inside the repair material fitting hole inside the repair material, and concrete is poured.

In addition, in one aspect of the present invention, in addition to the above steps, the repair method of the present invention includes a drainage hose provided in the shut-off plate below the repair material fitting hole. Through the drainage hose, drain the groundwater outside the underground concrete structure, then inject the waterproofing agent from the inside of the drainage hose and supply it to the outside of the shutoff plate to stop the water. The method further comprises the step of pulling out the water draining hose.

[0008]

According to the repair material of the present invention, in the peripheral portion of the panel,
Since a plurality of connecting reinforcing bars for connecting with the reinforcing bars of the underground structure are arranged at a predetermined interval over the entire circumference so as to project from the peripheral edge of the panel, this repair material is a hole requiring repair of the underground structure. Is fitted into a repair material fitting hole formed by expanding, and by welding the connecting reinforcing bar to the reinforcing bar remaining in the hole, a framework for concrete pouring is completed, and from the inside of the underground structure, Reinforcing bars can be arranged in the holes and concrete can be placed.

Further, according to the repair method of the present invention, the repair material fitting hole is formed by expanding the breakage hole, the repair material is fitted into the repair material fitting hole, and the panel peripheral portion of the repair material is provided by the shut-off plate. Closure of the gap between the peripheral edge of the repair material fitting hole, welding of the reinforcing bar for connecting the repair material and the reinforcing bar of the repair material fitting hole, filling of the quick-setting mortar, etc., and the inside of the repair material Reinforcing bar reinforcement and concrete pouring into the repair material fitting hole can be done from inside the underground structure.

Further, according to one aspect of the present invention, the drainage hose is inserted through the shut-off plate provided in the lower portion of the repair material fitting hole, so that groundwater is drained by this drainage hose at the start of construction. Even if there is, the construction can be done without any problems. Then, after stopping the water by injecting the waterproofing agent from the inside of the water draining hose and supplying it to the outside of the shutoff plate, the draining hose is pulled out, and then the concrete is placed. By doing so, repair work can be performed without being affected by groundwater.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of an underground concrete structure repair material of the present invention, and FIG. 2 is a side view thereof.

The repair material 1 is composed of a panel 2 having a substantially rectangular shape. The panel 2 is formed by mounting a C-shaped steel 4 with bolts 5 on a plate material 3 made of a synthetic resin or steel formed in a rectangular shape, along a diagonal line of the panel 2. A pair of reinforcing members 6 made of L-shaped steel are attached to the corners of each diagonal panel by welding or the like so as to cross each other. In addition, 7 in FIG.
Is a rubber packing interposed between the plate member 3 and the C-shaped steel 4, and 8 is a rubber-lined washer.

A plurality of connecting reinforcing bars 9 for connecting to the reinforcing bars of the underground concrete structure are formed on the outer peripheral edge of the C-shaped steel 4 of the panel 2 so as to project outward from the peripheral edge of the panel 2. Welded all around. The distance between the reinforcing bars 9 is set according to the distance between the reinforcing bars of the structure to be repaired or is bent and connected.

Plural kinds of lengths of the sides of the panel 2 are prepared in advance so that the construction can be carried out immediately depending on the size of the repaired portion.

Next, a method of repairing a damaged hole of an underground concrete structure using this repair material 1 will be described.

First, the concrete wall around the damage hole 11 of the concrete wall 10 of the underground structure shown in FIG. 3 is crushed according to the medium size of the repair material 1 having a plurality of sizes, and the damage hole 11 is shown. A repair material fitting hole 12 is formed by expanding to a range indicated by a dotted line A in FIG. Then concrete wall 1
As for the reinforcing bar 13 in 0, the extra reinforcing bar is cut off, leaving the one to be connected to the connecting reinforcing bar 9 of the repair material 1. Note that FIG.
In (a), reference numeral 14 indicates the ground outside the concrete wall 10.

Next, as shown in FIGS. 4 and 5, a shut-off plate 15 made of a plurality of steel plates or synthetic resin plates (dotted line B in FIG. 4).
Are shown on the outside of the repair material fitting hole 12.

As shown in FIG. 6, the shut-off plate 15 is provided with a plurality of wire insertion holes 15a, and wires 16 are inserted into the wire insertion holes 15a. When installing the shut-off plate 15, the shut-off plate is arranged outside the repair material fitting hole 12, and each shut-off plate 15 is loosely tied to the residual reinforcing bar portion 13 of the concrete wall 10 by the wire 16. Further, water blocking packings 18 are attached to both sides of the shutoff plate 15 in the longitudinal direction.

When groundwater flows into the inside of the structure from the outside of the lower part of the repair material fitting hole 12, one or several shutoff plates 15 'through which the drainage hose 17 is inserted are prepared in advance. The repair material fitting hole 12 is placed below the repair material fitting hole 12.
In the figure, 15a 'is a wire insertion hole of the shutoff plate 15'.
Groundwater flows into the structure through the drain hose 17 and is drained.

Next, as shown in FIGS. 4 and 5, the repair material 1 is fitted to a position closer to the outer side of the repair material fitting hole 12, and the connecting reinforcing bar 9 of the repair material 1 is placed in the repair material fitting hole 12. Remaining rebar part 1
The repair material 1 is fixed by welding to No. 3. Welding is performed from the upper part where groundwater does not flow out.

After that, the wire 16 of the shut-off plates 15 and 15 'is pulled from the inside, and the shut-off plates 15 and 15' are pressed against the outside of the peripheral portion of the panel 2 and the outside of the peripheral portion of the repair material fitting hole 12 to make the panel 2
The gap between the peripheral edge of the above and the peripheral edge of the repair material fitting hole 12 is closed.

Next, as shown in FIGS. 7 and 8, the space between the peripheral edge of the panel 2 and the peripheral edge of the repair material fitting hole 12 is rapidly dried and solidified with quick-setting mortar, quick-setting cement or the like. It is filled with the filling material 19 and closed.

Next, as shown in FIG. 9, the drain hose 17
By injecting the water blocking agent 20 from the inside and supplying it to the outside of the shutoff plate 15 ′, the water blocking agent 20 is solidified to stop the water. When the water stop is completed, the drain hose 17 is pulled out. The water draining hose 17 is cut short and placed later. It may be embedded in concrete.

After that, the repair material fitting hole 12 inside the repair material 1
Repair is completed by arranging reinforcing steel bars 21 inside and placing fresh concrete 22 therein. The completed repaired part has a smooth inner surface that is flush with the concrete wall 10 and the reinforcing bar 21 is reinforced, so that the repaired part has sufficient strength.

In the above embodiment, first, the shut-off plate 15 is arranged outside the repair material fitting hole 12, the wire 16 is tied to the reinforcing bar 13, and then the repair material 1 is fitted into the repair material fitting hole 12. Although the reinforcing bars 9 and 13 are welded, conversely, first, the repair material 1 is fitted into the repair material fitting hole 12 and the reinforcing bars 9 and 13 are welded, and then the cutoff plates 15 and 15 'are arranged at predetermined positions. Alternatively, the wire 16 may be attached to the reinforcing bar 13 or 9.

Further, as shown in FIG. 10, before the repair material 1 is fitted into the repair material fitting hole 12, the shut-off plate 15 is left with the lower part 12a of the repair fitting hole 12 into which ground water is flowing out. The lower part 12a is arranged at the periphery of the repair material fitting hole 12, then the repair material 1 is fitted in the repair material fitting hole 12, the reinforcing bars 9 and 13 are welded, and then the drainage hose 17 is inserted through the shut-off plate 15 '. May be closed. By doing so, since the shutoff plate 15 'can be supported on the lower edge of the panel 2, the work can be easily performed even in the lower portion of the repair material fitting hole where the groundwater flows out.

In the above embodiment, the repair material is shown to be formed in a quadrangle, but the shape of the repair material is not limited to a quadrangle, and may be another shape such as a circle or a polygon. Although the connecting rebar is welded to the C-shaped steel in the above embodiment, the method of attaching the rebar to the panel is not limited to this structure, and various structures are possible.

[0028]

As described above, according to the repair material of the present invention, a plurality of connecting reinforcing bars for connecting to the reinforcing bars of the underground structure are projected from the peripheral edge of the panel at the peripheral edge of the panel. Since it was arranged at a predetermined interval over the entire circumference, this repair material was fitted into the repair material fitting hole formed by expanding the hole requiring repair of the underground structure, and the connecting reinforcing bar was fitted in the hole. By welding to the remaining rebar, a framework for concrete pouring is completed, and the rebar can be laid in the hole from the inside of the underground structure to concrete.

Further, according to the repair method of the present invention, the repair material fitting hole is formed by expanding the breakage hole, the repair material is fitted into the repair material fitting hole, and the panel peripheral edge portion of the repair material is provided by the shutoff plate. Closure of the gap between the peripheral edge of the repair material fitting hole, welding of the reinforcing bar for connecting the repair material and the reinforcing bar of the repair material fitting hole, filling of the quick-setting mortar, etc., and the inside of the repair material Reinforcing bar reinforcement and concrete pouring into the repair material fitting hole can be done from inside the underground structure. Therefore, unlike the conventional method, it is not necessary to excavate the ground outside the underground structure, and the repair can be easily performed in a short period of time.

Further, by arranging the reinforcing material in the repair material fitting hole and placing concrete, the repaired portion has a smooth inner surface after the completion of repairing, and the necessary strength can be sufficiently secured.

Further, according to one aspect of the present invention, the drainage hose is inserted through the shut-off plate disposed below the repair material fitting hole, so that groundwater is drained by this drainage hose at the start of construction to remove groundwater. Even if there is, the construction can be done without any problems. Then, after stopping the water by injecting the waterproofing agent from the inside of the water draining hose and supplying it to the outside of the shutoff plate, the draining hose is pulled out, and then the concrete is placed. By doing so, repair work can be performed without being affected by groundwater.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an underground concrete structure repair material of the present invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a view showing a damage hole of an underground concrete structure, (a) is a side view and (b) is a front view.

FIG. 4 is a front view showing a state in which a repair material is fixed in a repair material fitting hole.

FIG. 5 is a side view showing a state in which a repair material is fixed in a repair material fitting hole.

FIG. 6 is a perspective view showing a shutoff plate.

FIG. 7 is a front view showing a state where a space between a repair material and a repair material fitting hole is filled with quick-setting mortar.

FIG. 8 is a side view of the state shown in FIG.

FIG. 9 is a view showing a state in which reinforcing bars are laid in repair material fitting holes and fresh concrete is placed.

FIG. 10 is a front view showing another method of installing the shutoff plate.

[Explanation of symbols]

 1 Repair Material 2 Panel 9 Reinforcing Bar for Connection 12 Repair Material Fitting Hole 13 Reinforcing Bar Part 15, 15 'Shutoff Plate 17 Drain Hose 19 Quick Filling Material 21 Reinforcing Bar 22 Raw Concrete

Claims (3)

[Claims] 1. A plurality of connecting reinforcing bars for connecting to reinforcing bars of an underground concrete structure are arranged at a peripheral portion of the panel so as to project from the peripheral edge of the panel at predetermined intervals. Underground concrete structure repair material. 2. A plurality of connecting reinforcing bars for connecting to the reinforcing bars of an underground concrete structure are arranged on the peripheral edge of the panel at predetermined intervals over the entire circumference so as to project from the peripheral edge of the panel. Prepare a repair material for the underground concrete structure, and crush the peripheral edge of the damaged hole of the underground concrete structure to the extent that the repair material can be fitted by crushing it, leaving the reinforcing bar portion to be connected to the connecting reinforcing bar of the repair material. Open to form the repair material fitting hole, fit the repair material into the repair material fitting hole, and weld the connecting reinforcing bar of the repair material to the reinforcing bar portion of the repair material fitting hole,
By disposing a shut-off plate outside the repair material fitting hole before and after that, a gap between the peripheral edge portion of the panel of the repair material and the peripheral edge portion of the repair material fitting hole is closed, and the repair material After filling the gap between the peripheral edge of the panel and the peripheral edge of the repair material fitting hole with a quick-setting filler such as quick-setting mortar, inside the repair material fitting hole inside the repair material A method for repairing an underground concrete structure, which comprises arranging reinforcing bars and placing concrete. 3. A drainage hose is inserted through one of the cut-off plates arranged below the repair material fitting hole, and the groundwater outside the underground concrete structure is drained by the drainage hose, and then this 3. The underground according to claim 2, further comprising a step of injecting a waterproofing agent from the inside of the drainage hose and supplying it to the outside of the shutoff plate to stop the water, and then pulling out the drainage hose. How to repair concrete structures.