JPS5827991B2 - How to spray resin concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to concrete (or mortar) spraying applied to protect ground surfaces that are prone to collapse, such as slopes and tunnel walls, or to repair concrete pouring surfaces. In particular, the present invention relates to a method of spraying resin concrete (1) to protect such construction sites with resin concrete (or mortar).

In this specification, the term "aggregate" is used to include fine aggregate and coarse aggregate;
-Conc I) -1-J is used to include mortar in which only fine aggregate is used as aggregate and concrete in which fine aggregate and coarse aggregate are used as aggregate.

Conventionally, wet or dry methods have been used for concrete spraying, but since it is always desired that the concrete sprayed on the construction surface develop strength quickly, spraying is used. concrete (cement concrete)
Powdered quick setting agents have been mixed into both wet and dry processes.

Powdered quick-setting agents scatter when sprayed, reducing the quick-setting effect and turning into dust, deteriorating the working environment and reducing work efficiency.

This problem was particularly serious when spraying inside tunnels.

In other words, if you refrain from using quick-setting agents, the sprayed concrete will not develop the desired strength in a short period of time.
Also, if a quick-setting agent is mixed in, it will cause a problem of dust in a narrow working area.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a spraying method that develops strength at an early stage and in which the spraying operation is not hindered by the generation of dust.

The present invention can be applied by forming resin concrete on a construction surface such as a tunnel wall by adding wet aggregate to a slurry or paste mixture containing a water-compatible resin material and cement; At the same time or immediately after mixing with wet aggregate and spraying it onto the construction surface to form a resin concrete layer on the construction surface, prevent powder from scattering during work, The aim is to achieve a dust-free work environment and effective wall protection through early development of strength, thereby dramatically improving construction efficiency.

The method of the present invention uses a slurry or paste mixture consisting of cement and a liquid resin such as a urethane resin as a hydratable hardening material that hardens only by reaction with water, or a mixture of a water-compatible liquid resin, cement, and the cement. Alternatively, a slurry or paste mixture consisting of various admixtures for the liquid resin is jetted onto the construction surface, thereby forming a film of the mixture adhering to the construction surface, and then immediately sprayed onto the wet aggregate. disperse the aggregate into the film of the mixture by spraying, thereby forming resin concrete or resin mortar on the construction surface, or at the same time or immediately after mixing the pasty mixture and the wet aggregate. The resin concrete layer is sprayed onto the construction surface to form a resin concrete layer on the construction surface.

By spraying the aggregate, the adhesion between the mixture and the wall surface is further increased, and hardening immediately begins due to the hydration reaction between the water contained in the aggregate, the resin, and the cement.

By selecting a resin material or cement material from among those with rapid hardening, or by selecting and adding a rapid hardening agent for those materials as an admixture, the curing time of resin concrete, that is, from mixing and spraying to resin concrete, can be changed. The time required to reach the desired intensity can be selected to be within several minutes.

Furthermore, since the mixture is in paste form, the cement and powdered admixture in the mixture will not become dust during construction and will not be scattered and deteriorate the working environment.

The features of the present invention will become clearer from the following description of embodiments.

First, the mixture constituting the hardening material is basically a mixture of a hydratable liquid resin such as urethane resin and cement, and if necessary, an admixture such as a quick hardening agent may be added. can.

By using a super-rapidly hardening urethane resin, such as "Vandex T1075J (trade name)" manufactured by Dainippon Ink Chemical ■, as the urethane resin, the reaction and curing time after adding water can be shortened to several minutes.

Cement itself does not react with the urethane resin, but it hardens through a hydration reaction.

By adding cement to urethane resin as a hardening material, the amount of resin can be reduced and long-term strength can be increased.

When using the above-mentioned ultra-rapid hardening urethane resin, ordinary cement can be used as the cement.

When the urethane resin has normal hardening properties, high strength can be obtained very quickly by using an ultra-rapid hardening cement, such as Osaka Cement's quick-setting agent "Lion Waterproof" (trade name).

If both the urethane resin and cement are materials that require a normal curing time, the mixture should be added with a quick hardening agent for the resin or cement, such as Denka Kogyo Co., Ltd.'s 1 Natomitsu, which is a cement quick setting agent. /165, Al0
By adding J (trade name), the curing time after the reaction between them and water has started can be significantly shortened.

The mixing ratio of resin and cement in the mixture can be 1:1 by weight.

The mixture is fluid in the form of a slurry or paste, and can be prepared by kneading it in advance before spraying.

Sand with surface water (or sand and gravel with a small diameter) is used as the wet aggregate.

When surface water is mixed into the film of the mixture described after mixing, it reacts with the urethane resin and cement to cause a hydration reaction in these materials.

The water content of the mixed paper is preferably 5 to 6% or more.

Further, the ratio of the urethane resin, cement, and mixed paper can be set at a weight ratio of 1:1.

Referring to FIG. 1, the actual spraying operation will be explained. The above-mentioned mixture of resin and cement, ie, resin cement paste 10, is fed under pressure from a tank (not shown) through a feed pipe 12, and has a rectangular cross section. It is ejected from a nozzle 14 having a shape.

On the other hand, the mixed paper 16 is loaded with high-pressure air, is forced through the feed pipe 18, and is blown out from the opening 20 thereof.

The distal end portions of the two tubes 12, 18, which are left in the hands of the operator, are appropriately connected via spacers 22, 24 to facilitate the operation.

These may be left in the hands of different operators.

For example, when constructing a primary lining on the arch wall surface of a tunnel, as shown in FIG. do.

The thickness of the film can be selected by suitably varying the scanning speed of the nozzle relative to the wall.

The mixed paper 16 is immediately sprayed onto the uncured resin cement paste film 28 adhering to the arch wall surface 26.

As a result, the paste is strongly pressed against the uneven wall surface of the membrane 28 by the action of high-pressure air and sand flying into the interior of the membrane, and the adhesion between the two becomes even tighter.

The sand sprayed against the membrane 28 also prevents the resin cement paste from dripping off the membrane surface.

Furthermore, once the mixed paper 16 is dispersed and mixed into the membrane 28, the resin and cement immediately absorb the surface water of the mixed paper and initiate a water phase reaction, within a time period adjusted by the selection of the resin material, cement, or admixture. It hardens and develops the required strength as a primary lining.

In the above example, paste resin cement and wet sand were separately sprayed onto a construction surface such as a tunnel wall to form resin concrete on the construction surface, but instead of this example, the following method was used. It can also be carried out.

That is, as shown in FIG. 4, a resin cement paste 32 sent through a feed pipe 30 and wet sand sent by high-pressure air are preferably mixed by a forced stirring device 34 such as a pipe mixer. The mixture is homogeneously mixed at a high speed, and the resin concrete mixture is exposed to high pressure air passing through a pipe 36 and sprayed onto the arch wall 26 at the same time or immediately after mixing.

As a result, a resin concrete layer 38 is formed on the arch wall surface.

In this case as well, the resin concrete can be cured within a time adjusted by the selection of the resin material, cement, or admixture, and the required strength as the primary soil covering can be developed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the situation in which resin concrete is sprayed according to the present invention onto the wall surface of a tunnel arch, and FIGS. 2 and 3 are taken along lines 2-2 and 3-3 in FIG. 1, respectively. The obtained spray is a partial sectional view of the apparatus, and FIG. 4 is a schematic diagram of the spray apparatus implementing another embodiment of the invention. 10...Resin cement paste, 12,30°
'. ...Resin mortar paste feed pipe, 14...
Nozzle, 16... Aggregate (mixed paper), 18, 32.
... Aggregate feeding pipe, 26 ... Tunnel arch wall surface, 28 ... Resin concrete IJ-1-,
34-... Stirring device, 36... High-pressure air supply pipe.

Claims (1)

[Claims] 1. Spraying a mixture of water-based liquid resin and cement to form a film of the mixture on the construction surface, and then spraying wet aggregate to mix the aggregate into the film of the mixture. Resin concrete spraying is a method characterized by forming a resin concretion (made of resin). 2. The resin conc'J-1 spraying method according to claim 1, wherein the water-compatible liquid resin is a urethane resin. 3. A mixture consisting of a hydratable liquid resin, Shichimen I, and an admixture is jetted to form a film of the mixture on the construction surface, and then wet aggregate is sprayed to form a film of the mixture within the film of the mixture. Resin concrete spraying is a method characterized by forming resin concrete consisting of mixed resin. 4. The resin concrete spraying method according to claim 2, wherein the admixture is a cement quick hardening agent. 5. Resin concrete, characterized in that a mixture of water-compatible liquid resin and cement and wet aggregate are mixed and sprayed onto a construction surface at the same time or immediately after, thereby forming a resin concrete layer on the construction surface. Spraying is a method. 6 At the same time or immediately after mixing a mixture consisting of a hydratable liquid resin, cement, and an admixture with wet aggregate, spray this onto the construction surface to form a resin concrete layer 1 on the construction surface-L. Resin conch 'J, which is characterized by
-1- Spraying is a method.