JPS58143098A - Production of blowing concrete and blowing method of said concrete - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a sprayed coscrete to be deposited on a tocinel excavated surface and the like, and a method for spraying the cosiclete.

In Toshinel construction, in recent years, instead of or in combination with the conventional steel arch shoring, sprayed cosicrete has been used to prevent the surrounding ground from collapsing.

The role of Cosicrete in this spraying is to prevent the occurrence of stress concentration by applying it immediately after excavation to smooth out unevenness on the surface of the surrounding rock, and to prevent the rock surface from being exposed to the outside air and weathering. In other words, it is used as a part of the shoring member to prevent the collapse of the ground and to provide resistance against earth pressure.

In addition, the desirable conditions for the cleat construction method (spraying inside the toshinel) are that the dust accompanying the spraying does not affect the health or work motivation of the workers, and that the work inside the toshinel does not create a ravine. The construction machinery must be as small as possible, the materials must be transported and supplied to the spraying machine smoothly, and the quality of the cosiclete after spraying must be ensured.

As for spraying, the dry method 1 has been mainly adopted as the Cosiclete construction method, and the wet method 1 has also been sometimes adopted.

Dry method 1 is the most commonly used method in Toshinel construction, and as shown in Figure 6, fine aggregate (μ) and coarse aggregate (μ) and cementite (b) are mixed together (C). The dry mix is then sprayed through an agitator car using a machine (
d), the quick setting agent (e) is added, and then the compressed air from the compressor (f) is blown onto the machine (d).
) into the material hose (g) 1'.

During this process, dry mix material is pumped to the rock surface, and water (h) is added to the rock surface by operating a nozzle machine at the nozzle (1) at the tip of the main bath.

However, according to this construction method, the amount of water added is adjusted according to the condition of the spraying surface, so it is difficult to obtain a uniform quality of sifrit, and it is difficult to obtain a uniform dry mixture. The aggregate and semesite may not adhere well, and the semesite may be pumped in powder form. Furthermore, the water, aggregates, and semesite are mixed only near the nozzle, so the mixing time is shortened. If the spray hits the rock wall due to insufficient mixing, it will bounce back and cause dust and dust.
This causes problems such as material loss and poor working environment. On the other hand, since the material is in a dry mix state, it has the advantage that it can be easily pumped using compressed air and can be pumped over long distances.

On the other hand, wet method 1 uses fine and coarse aggregate (a
) (Mi+sa-(
After kneading in C), the spraying is supplied to the machine (d) through the agitator 9, and the quick setting agent (e) is supplied into the compressed air from the cocipressor (forced) through the nozzle (1). It is sprayed from above.

According to this method, since the materials are completely mixed before being pumped, quality control is easy and there is almost no separation of materials. Although it has the advantage of less rebound, the material has to be pumped over a short distance, the inside of the hose may be blocked by the material during spraying, the construction machinery becomes larger, and the material must be pre-filled with aggregate, water, cement, etc. Since all of the materials are kneaded, there are disadvantages such as being limited in the time from kneading to softening, and when spraying a small area several times, there is a large loss of material.

For this reason, recently, construction methods have been developed that incorporate the advantages of both the dry method and wet method 1 mentioned above. A machine (d) is used to spray the dry mix with Jusu-(C).
, add the necessary amount of water at the outlet, and then immediately pressurize it with compressed air from the compressor (f), or add the required amount of water to the compressed air,
There is a method of pumping it as a dry mix material in the main stream.

According to this construction method, the water and dry mix material are sufficiently mixed during the spraying process in the main space, resulting in less dust generation and the pumping distance being somewhat longer, but the spraying does not collide with the rock surface. The rebound when hitting the ball has not been improved. Therefore,
A construction method was developed in which a sticky material such as polyethylene resin was dissolved in added water, and when the aggregate particles collided with the rock surface by spraying, the adhesive would adhere to the wall surface. While the adhesive is being pumped through the space, the adhesive adheres to the inner wall surface of the main space, and the fine aggregate and cementite also adhere to the adhesive, resulting in a state where one coarse aggregate is separated, and therefore both aggregates are distributed evenly. Only the coarse aggregate is ejected first without being ejected from the nozzle, and there is a lot of rebound especially at the beginning of spraying. In addition, the fine aggregate adhering to the inside of the hose may intermittently harden and eject, and the reaction may give a strong impact to the nozzle machine.

This phenomenon is caused by the fact that the flow velocity distribution of air and other fluids flowing through tubes such as hoses is faster at the center of the tube and slower at the periphery, so coarse aggregate, which has a large cross-sectional area and is easily susceptible to pressure, flows toward the center. This is caused by the flow of fine aggregate and cement into the surrounding area.

In addition, when spraying cosiclete inside a tocinel, it prevents the cosiclete attached to the wall surface from peeling off due to its own weight during upward construction, and in addition, on soft ground, spraying can resist ground pressure in a short time after the construction of cosiclete. The use of quick-setting agent (e) is essential because it is necessary to develop strength in a short time to prevent the rock from collapsing due to the blasting required for the next excavation. This is common to all of the above construction methods.

In order to eliminate the drawbacks of the conventional method described above, the present invention involves applying a sticky solution to fine aggregate and coarse aggregate, and then sprinkling a sufficient amount of cementite to form a material in a dry mix state. After that, the method for producing Cosicrete is characterized by adding an appropriate amount of water and a quick-setting agent to this material, and supplying the material in the dry mix state to a spraying machine, and adding an appropriate amount of water and a quick-setting agent. The present invention provides a method for spraying Sifreet which is characterized in that it is made into raw cocycrete by adding and then subjected to barking.

To explain the embodiment of the present invention with reference to the drawings, first, fine aggregate (1) and coarse aggregate (2) are put into a mixer (8) and both aggregates (1) and (2) are mixed. Stir thoroughly to mix. Then, a viscous solution (4) consisting of a thickener such as polyacrylamide is submerged in a mixer (8).
Add an appropriate amount to the aggregate and stir and knead together with both aggregates (1) and (2).

In this solution (4), the sum of the surface water of aggregates (1) and (2) and the amount of water in which the thickener is dissolved is the unit water amount required for the desired cosicrete (to form the desired unit cosicrete). A thickener is dissolved in an amount of water equal to h - the weight of water required for the sail.

When aggregates (1) (2) and solution (4) are stirred and kneaded,
As shown in Figure 2, the solution (4) adheres to the surfaces of the fine aggregate (1) and the coarse aggregate (2), and due to the viscosity of the solution (4), both aggregates (1) and (2) ) adheres through the solution (4) to form a mass (5), or the fine aggregates (1) form a mass (6), and the entire aggregate is in a state of adhesion to each other. .

Next, add Cemesite powder (7) to the aggregate in such a state at once in the total amount required for the desired cosicrete to the aggregate that is being stirred with a mixer (8). Alternatively, if it is added gradually, the cementite (7) is gradually mixed into the sticky solution (4) attached to the surface of the aggregate, and finally the solution (4) with the cementite (7) attached to the aggregate surface is mixed. ) appears on the outer surface of the layer (4) as shown in Figure 3, and the solution (4) disappears between the aggregate particles adhering to each other, and the aggregate has a solution coating layer (b) containing semecite on its surface.
Cemecyto (
7) Separated into independent dry mix aggregate (1') (2') or coarse aggregate (2)
has a solution coating layer (b) containing semesite on its surface with fine aggregate (1) attached around it, or with fine aggregate and coarse aggregate attached together, and on the surface of the coating layer. Independent aggregates 11 (8) (9
).

Such a state is caused by the ratio between the amount of solution (4) and the amount of semesite (7) and the stirring ability of the triplexer (8), and preferably the former, that is, the amount of individual aggregates (1
) (It is better to use a dry mix with a semecite-containing solution coating layer (b) on the surface of the second layer and a semecite layer attached to the surface of the coating layer, but even in the latter state, the size of the aggregate It can be used as long as it does not interfere with pressure feeding to the nozzle.

In this way, solution (4) and semecit (
7) is attached to the surface of dry mix aggregate (1'
) After obtaining <d>, next, this aggregate (1')tj>
It is carried out by means of conveyance αQ such as a belt conveyor.
The sprayed material is transported from δ) to the machine αυ, and the sprayed material is fed into the machine 01). During transportation by this transportation means α0, the rapid setting agent (b)
Add a certain amount and evenly to the amount of aggregate.

The blowing machine (11) is connected to an air outlet (11) connected to the aggregate outlet portion thereof, through which compressed air is sent from a compressor (18) installed at a separate speed. Material hose 0 that transports aggregate to the wall surface of Toshinel
6) is connected, and the sprayer is configured to continuously discharge a predetermined amount of aggregate fed into the machine 0υ from the outlet. Further, a spray nozzle αη whose tip is open to the atmosphere is attached to the tip of the material hose 06).

The aggregate (r) (i) fed into the spraying machine α1) is quantitatively discharged from the outlet of the spraying machine 01), and the compressed air from the cosipressor (b)
The aggregate (1') <i+ is introduced into this air stream, and the aggregates (1) and (2) are carried by the air stream. The material is then flowed from the material hose θ6) to the nozzle aη.

During the flow, that is, the spray is applied to appropriate parts of the material hose 06) between the machine 0υ and the nozzle (B). /4) Water (g) is supplied as secondary water by appropriate means. In addition, in Fig. 1, the secondary water (
E) is supplied to the material hose extension near the outlet of the machine 0υ.

This secondary water serves to transform the cementite (7) adhering to the surface of the aggregate (1') (i) into a cementite paste.

In this state, it is softened from the nozzle tip opening to the wall surface of the toshinel (b).

The fine aggregate (1') sprayed onto the wall surface (b) has a sticky solution (4) on its surface and a layer of cementite (7) attached inside and on the surface of the solution. And since the semesite is turned into a semesite paste on the surface of the layer (b) by water (e), the solution coating layer (4) becomes sticky due to the adhesiveness of the solution and the semesites paste. It can be firmly attached to the wall without bouncing back.

Also, in coarse aggregate (2), the repulsion energy f is similar to that in fine aggregate.
- and furthermore, due to the viscosity of the solution on the surface of the fine aggregates attached to the wall surface, the rate of adhesion to each other and rebounding from the wall surface is extremely low.

In addition, in the above examples, the fine aggregate (1) and the coarse aggregate (2) were both put into the mixer (3) and mixed.
As shown in FIG. of! +Sasa-aa)
(8b) and agitated and mixed to form fine aggregate (1) and coarse aggregate (2'), which may then be fed into Mitosu-(8C) and agitated and mixed. In addition, if spraying onto the wall surface is performed using only mortar, it is sufficient to form only the fine aggregate (1').

As described above, in the present invention, a sticky liquid such as a polymer substance is added to the aggregate that becomes the cosicrete material, and the mixture is stirred, and then the cemeshite powder is added, and this is stirred and mixed to form the adhesive liquid on the surface of the aggregate. Cosicrete is a spraying process characterized by forming a dry mix-like aggregate to which Cemecite powder is attached via a liquid, and then adding appropriate water and a quick-setting agent to the aggregate to form ready-mixed concrete. The method for producing Cosicrete and the method for spraying Cosicrete, which is characterized by spraying the Cosicrete onto a wall surface via a hose with compressed air, are related to the method, so that an adhesive solution coating layer containing Cemecite is formed on the surface of the aggregate. Since aggregate is formed with a layer of cementite powder attached to the surface of the coating layer, it becomes the same state as the dry mixed aggregate obtained by the dry method 1, and the pressure feed hose is blocked. The aggregate can be made to flow smoothly through the hose, and the aggregate can be pumped over a long distance by using a long hose. Furthermore, since the cement is adhered in a layered manner to the adhesive solution coating layer on the surface of the aggregate, fine and coarse aggregates do not separate, and aggregates do not adhere to the inner wall surface of the main space, causing no impact to the nozzle machine. It is possible to form sprayed cosicrete of uniform quality without causing any damage.

Furthermore, as mentioned above, an adhesive solution film layer is formed on the surface of the aggregate, and when the surface cemeshite layer is converted into raw cosicrete, an appropriate amount of water is added to form a cemeshite paste. , Toshinel, etc. adhere well to the wall surface and the bounce rate is significantly reduced. Furthermore, since cementite and extremely small fine aggregates are not sprayed independently, they reduce the generation of dust. It is something that can be eliminated.

Furthermore, the sum of the surface water of the aggregate, the water content of the viscous liquid, and the amount of water for forming raw cosicrete is the amount of water required for the aggregate to be sprayed, and the amount of water required for spraying the aggregate is The amount of water for making raw cosicrete is automatically determined by adjusting the variation in unit water amount with the water content of the sticky liquid. Therefore, the quality is better than the conventional method of spraying while adjusting the water amount with a nozzle machine. ).

In addition, when fine aggregate and coarse aggregate are kneaded with sticky liquid and semecite on each side to form fine aggregate and coarse aggregate in the form of a dry mix, and then both aggregates are mixed, Since a dedicated mixer with high capabilities can be used when kneading the cement, efficient mixing can be performed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram showing the manufacturing process from the process to barring, FIG. FIG. 3 is an enlarged sectional view of the aggregate in a dry mix state, FIG. 1 is a sectional view of the cementite layer of the aggregate in a paste state, and FIG. 5 is a block diagram showing another embodiment of the present invention. 6 to 5 are block diagrams showing the conventional construction method. (1) is fine aggregate, (2) is coarse aggregate, (8) is mixed,
(4) is a solution, (7) is semesite, αQ is koshibea, (
11) is the machine for spraying, (b) is the quick setting agent, (b) is the stiffness reducer, and is the material hose, CI? ) is the nozzle,
(1) and (2) are dry mix fine and coarse aggregates. Patent applicant Okumura Co., Ltd. Gumi Roku I Hakagebe? :, Ha505

Claims (1)

[Scope of Claims] α) A sticky liquid such as a polymer substance is added to the aggregate that will become the cosicrete material, and the mixture is stirred, and then cement powder is added, and this is stirred and mixed to form the adhesive on the surface of the aggregate. Cosicrete is a method of spraying that is characterized by forming a dry mix-like aggregate to which Cemecite powder is attached via a liquid, and then adding an appropriate amount of water and a quick-setting agent to the aggregate to form raw cosicrete. manufacturing method. ■ A sticky liquid such as a polymeric substance is added to the aggregate that will become the cosicrete material, and the mixture is stirred, and then the cemeshite powder is added, and this is stirred and mixed so that the cemeshito powder is applied to the surface of the aggregate via the sticky liquid. The aggregate in the form of a dry mix is formed, and then the aggregate is fed to a spray machine, and an appropriate amount of water and a quick-setting agent are added to the aggregate to convert it into raw cosicrete while it is being pumped by the spray machine. The method of spraying Cosicrete is characterized by spraying with compressed air.