JPS5843530B2 - Fukitsuke Concrete Information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing road side walls.

In particular, side walls of national highways, prefectural roads, etc. that pass through mountainous areas.

) are sprayed with mortar or concrete to prevent falling rocks, collapse, etc.

In recent years, this coating layer (hereinafter referred to as mortar layer) has been developed.

) has become dilapidated, and there have been cases where parts of it have been detached from the rock and floated up.

At present, when repairing the above-mentioned peeled part, the method of repair is to strip the part and apply a new coating of mortar or the like.

However, since such stripping work is performed at the roadside, the stripped mortar pieces may be scattered on the road surface, which is extremely dangerous for passing vehicles and workers.

Furthermore, even if a new layer of mortar is applied to the stripped area, due to the differences in the characteristics of the old and new mortar layers, the bonding force between the two is weak, and repair work is therefore forced to be done again in a relatively short period of time. That was the result.

The present invention was devised in view of these circumstances, and its purpose is to be able to carry out repair work without peeling off the peeled areas, and to maintain the functionality of the mortar layer for as long as possible. The purpose is to provide a repair construction method.

An embodiment of the method of the present invention will be described below with reference to the drawings.

In the figure, 1 is a mortar layer formed on the surface of a rock 2 on the side wall of the road.

Now, consider a location (peeling location 5) where a portion of this mortar layer 1 has peeled off from the surface of the rock shelter 2 and floated up (peeling location 5) as a repair target in this example.

First, a permeable resin-based waterproofing liquid is applied to the surface of the mortar layer 1 over an appropriate area including the peeling location 5.

In this example, the penetrating resin-based waterproofing liquid is Pichi, a product of Sanei Kosan Manufacturing Co., Ltd., and is applied to the inside of the mortar layer 1 for about 1.
After being impregnated to a depth of 5 to 2 crIl, a surface waterproof layer 3 is formed here.

In other words, by applying a penetrating resin-based waterproofing liquid,
The purpose is to prevent rainwater, etc. from entering through the surface of the mortar layer 1), which has lost its clear water properties and has deteriorated.
This prevents subsequent delamination from occurring.

In addition, when applying the penetrating resin-based waterproofing liquid, it becomes effective when the surface portion of the mortar layer 1 has been dried to a moisture content of approximately 30% or less, so it must be dried using a jet heat etc. in advance. Alternatively, it is best to carry out this work during the dry period of summer.

After the above-mentioned operation, a chemical liquid injection hole of about 9.5 to 35 mm is bored at an appropriate position from the surface of the mortar layer 1 to the inside of the peeled part 5.

Then, the press-fitting pipe 4 is inserted into this hole, and the hydrolyzed reaction type urethane resin liquid and water are injected under pressure in the direction of arrow 8 in the figure.

The water-reactive urethane resin liquid has the property of retaining a large amount of water, and is reacted in a short period of time. After the reaction, it is gelled to obtain a urethane foam with high adhesive strength and elasticity.

That is, due to the reaction between this hydrolyzed urethane resin liquid and water, the inside of the peeling area 5 is filled with a urethane foam having waterproof and water-stop properties, thereby elastically adhering the peeling mortar layer.

However, during the above injection, if there is water flowing out inside the peeling area 5, water may not be injected at the same time. A stuffing hole 6 of a required depth is drilled to reach the inside of the cave 2, and an appropriate amount of fibrous material 7 (for example, absorbent cotton) is stuffed therethrough.

Then, as described above, the hydrolyzed urethane resin liquid and water are simultaneously injected into the stuffing hole 6 under pressure.

Then, when the urethane foam is generated, the hydration-reactive urethane resin liquid penetrates between the fibers of the fiber material T and is gelled using the fiber material 7 as a core material, so that this product has a harder hardness than the urethane foam alone. Therefore, the peeled mortar layer can be firmly bonded to the rock 2.

After completing the above work, caulk the chemical injection hole and filling hole 6 drilled in the peeled area 5.
Repair work is completed.

The effects of this construction are listed below.

(1) Since the peeling portion 5 is filled with urethane foam having waterproof and water-stop properties, it is extremely effective in waterproofing infiltrating water such as rainwater and stopping water flowing out from inside the cave 2.

(2) In addition, if a waterproofing liquid is applied to the surface of the mortar layer 1 as in this example, the effect of (1) will become even more remarkable, and the aging rate of other parts other than the peeling point 5 will be significantly reduced. It will cause a decline.

(3) Unlike the conventional method, there is no need to strip off the peeled portion 5, so the working time is shortened and the work can be carried out safely without scattering peeled mortar pieces on the road surface.

(4) Since the peeled area 5 is repaired as it is without being peeled off, there is no need for re-peeling due to differences in the characteristics of the old and new mortar layers 1, unlike in the past.

In this example, a case is illustrated in which the waterproofing liquid is applied prior to the chemical injection operation, but it goes without saying that this operation may be performed after the chemical liquid injection.

As described in detail above, the present invention is capable of waterproofing and water-stopping without peeling off the old mortar layer by simultaneously injecting a water-reactive urethane resin liquid and water into the peeled area under pressure and filling the inside with urethane foam. Construction can be carried out.

Further, by drilling a hole deep enough to reach the inside of the cave, filling it with fiber material, and simultaneously injecting the urethane resin liquid and water, the bonding strength of the peeled part can be further improved.

In other words, the present invention is extremely useful for this type of repair work, as the work can be done safely and quickly, and the functionality of the mortar layer can be fully expected to be maintained for as long as possible. .

[Brief explanation of drawings]

The drawing shows one embodiment of the present invention, and shows a sectional view during repair work. DESCRIPTION OF SYMBOLS 1...Mortar layer, 2...Iway, 3... Surface waterproof layer, 5... Peeling part, 6... Filling hole, 7... Textile material.

Claims (1)

[Claims] 1. A repair method for repairing peeling parts of a construction wall where mortar or concrete has been sprayed onto cut banks to prevent rock falls on mountain roads, etc., by drilling holes from the construction wall surface into the inside of the peeling parts. Fill the inside of the peeled area by injecting a hydrolyzed reactive urethane resin liquid and water under pressure. At the same time, a hole is drilled at the peeled area to a depth that reaches the inside of the cut bank. After inserting the fiber material from there, the wire hole is filled. A road side wall repair method comprising injecting the urethane resin liquid and water again under pressure.