JPH04182569A - Method of mixing accelerator with placed concrete - Google Patents

Abstract

PURPOSE:To mix a liquid accelerator uniformly in a short time by feeding this liquid accelerator under pressure with a high pressure or superhigh pressure pump via a hose, and jetting it from a jet at the end part of a nozzle. CONSTITUTION:A liquid accelerator is fed under pressure with a high pressure or superhigh pressure pump 6 via a feed hose 8. Then, this pressure-feed liquid accelerator is jetted to placed concrete from singular or plural end jets of a nozzle 5 making an axis installed in the feed hose 8 the turning center. With this constitution, an impact phenomenon is caused in a honeycomb injection mixing coarse aggregate, thus uniform mixing can be done in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to rapid solidification of poured concrete (in particular, during primary lining work with concrete such as tunnel construction).
This relates to the method of incorporating an accelerating agent into the concrete, which is adopted when solidification (hardening) is required.

(Prior art) As is known, concrete pouring and spraying are
A quick-setting agent is added to the concrete, but in this case, in the above-mentioned spraying process, the concrete is sprayed at the desired location using compressed air, so the powder quick-setting agent added in advance is mixed well with the concrete. The Rukoto.

On the other hand, in pouring work where concrete is supplied to the required location by a concrete pump through a concrete pressure pipe, a powder quick-setting agent or a liquid quick-setting agent is added in the middle of the concrete pressure pipe. However, the quick-setting agent is not mixed uniformly with the concrete, and in order to ensure sufficient mixing, it is mixed in with the concrete being pumped. If the quick-setting agent is added too early, the concrete will begin to harden during pumping.

Therefore, methods have been implemented in which the quick-setting agent is injected from an injection nozzle and then mixed with a stirring blade, or the quick-setting agent is injected from the rotating blade itself and kneaded (Japanese Patent Publication No. 63-4199). The resulting quick setting agent cannot be brought into a satisfactory homogeneous mixed state even by stirring.

(Problems to be Solved by the Invention) The present invention examines the deficiencies of the above-mentioned conventional examples, and based on a different idea from the conventional method of mixing an accelerating agent, claims (11) By using a pump to spray the concrete from the end of the nozzle onto the concrete at the required location, it is possible to mix the quick-setting agent into the concrete in an extremely uniform manner within a short period of time. It is a purpose.

In claim (2), the nozzle is rotated so that its axis is the center of rotation, and the number of the end jet holes is not only one but a plurality, so that the liquid quick-setting agent can be produced more quickly and uniformly. This allows for mixing.

Claim (3) provides for the method of injecting the liquid quick-setting agent according to claim (1) from the supply port of the concrete pressure-feeding pipe toward the placed concrete that is being pressure-fed from the jet hole at the end of the nozzle under high pressure or ultra-high pressure. By doing so, the injected liquid quick setting agent can also be injected onto the inner wall of the concrete pressure pipe, thereby further improving the uniformity and speed of layer mixing.

In claim (4), whereas claim (3) injects a liquid quick-setting agent to the poured concrete in the concrete pressure pipe, the liquid quick-setting agent is sprayed onto the surface of the poured concrete provided at the pouring location. By injecting a liquid quick-setting agent from the movable end plate, the poured concrete can be partially hardened and the poured concrete can be effectively prevented from flowing away within a short period of time. ing.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has the following features: (11) A liquid quick-setting agent is force-fed through a supply hose by a high-pressure or ultra-high-pressure pump, and Claims a method for mixing an quick-setting agent into poured concrete, characterized in that the pumped liquid quick-setting agent is injected onto the poured concrete at a required location from a jet hole at the end of a nozzle provided. In (2), a liquid quick-setting agent is pumped through a supply hose by a high-pressure or ultra-high-pressure pump to one or more end spout holes of a nozzle whose rotation center is an axis provided in the supply hose. Accordingly, the present invention aims to provide a method for mixing an quick-setting agent into poured concrete, which is characterized in that the pressure-fed liquid quick-setting agent is injected onto the poured concrete at a required location.

In claim (3), the liquid quick-setting agent is force-fed through a supply hose by a high-pressure or ultra-high-pressure pump, and the forced liquid quick-setting agent is cast from an end spout hole of a nozzle provided in the supply hose. It is characterized in that the poured concrete is sent to the place by a concrete pump through a concrete force feed pipe, and is injected through one or more supply ports provided in the concrete force feed pipe closer to the concrete place. Claim (4) provides a method for mixing a quick-setting agent into poured concrete, and in claim (4), a liquid quick-setting agent is pumped through a supply hose using a high-pressure or ultra-high pressure pump, and the liquid quick-setting agent is fed to the end of a nozzle provided on the supply hose. The liquid quick-setting agent is pumped from the injection hole to the place where the concrete is poured by the concrete pump via the movable weir plate, and the movable gable plate is in contact with the surface of the poured concrete. Each of these describes a method of mixing an quick-setting agent into poured concrete, which is characterized by spraying the agent through a supply port.

(Function) When using the quick-setting agent mixing method of claim (1), the liquid quick-setting agent is poured from the jet hole at the end of the nozzle at a high or ultra-high pressure such as a discharge pressure of 200 to 500 kg/cm''. Since it is sprayed onto the concrete, the liquid quick-setting agent is injected and mixed into the concrete in a honeycomb shape, and furthermore, at this time, when it collides with the coarse aggregate in the concrete, the liquid quick-setting agent breaks up and scatters. Therefore, the mixing condition becomes even better and the mixture is evenly dispersed in the concrete.

In the method of claim (2), since the nozzle rotates in the method of claim (1), not only the spray range of the liquid quick setting agent is expanded and quick and uniform mixing is promoted, but also the The rotation also prevents the end injection hole of the nozzle from becoming clogged as the concrete hardens.

In addition, at this time, by having multiple injection holes at the end of the nozzle,
Collision between the liquid quick-setting agents injected from the respective end spout holes also occurs, which increases the scattering phenomenon of the liquid quick-setting agent, which promotes uniform mixing more quickly. becomes.

In claim (3), since the liquid quick-setting agent is injected onto the concrete placed in the concrete pressure pipe, it not only has the effect described above in claim (1) (but also injects the liquid from the end spout hole) The jet flow of the liquid quick-setting agent also hits the inner wall of the concrete pressure pipe, resulting in dispersion and mixing.

Further, at this time, if the concrete pressure pipe has a plurality of supply ports, the liquid quick-setting agent ejected from each supply port will also collide with each other, which will further promote uniform mixing.

In the case of claim (4), the object is not to place concrete in a concrete pressure pipe, but to place concrete from a concrete pressure pipe via a movable weir plate at a required place in the ground in a tunnel or the like. While supplying
By bringing a movable end plate into contact with the surface of the poured concrete and injecting a liquid quick-setting agent from this moving end plate onto the same poured concrete, only the surface layer of the poured concrete is quickly mixed with a uniform liquid quick-setting agent. It will solidify into
As a result, the purpose of primary lining of tunnel construction can be quickly achieved with a small amount of liquid quick-setting agent without having to harden all of the poured concrete, and since it is not injected into the concrete pressure pipe, Also, the flow of concrete in the concrete pressure pipe will not be blocked due to hardening of the poured concrete.

(Example) If the present application is described in detail with reference to drawings, in the method of claim fil, a liquid quick-setting agent is injected into poured concrete at a required location using a high-pressure or ultra-high-pressure pump. However, this will first be explained with reference to the apparatus of FIG. 1 with which the method according to claim (3) can be carried out.

In Fig. 1, reference numeral 1 indicates a concrete pump, and 2 indicates a concrete pressure-feeding pipe connected to the concrete pump. It is now possible to supply.

Injection part 2 is located near the discharge port 2a of the concrete pressure pipe 2.
b is provided with one or more supply ports 4 as shown in FIG. 2, and a nozzle 5 is attached to the supply port 4.

A liquid quick-setting agent supply hose 8 is connected to this nozzle 5 from a high-pressure or ultra-high-pressure pump 6 via a distribution valve or a switching valve 7, and B in the figure indicates a ground.

When using the above device, the liquid quick-setting agent is injected from the nozzle 5 to the poured concrete in the concrete pressure feed pipe 2 from the supply port 4 in the injection part 2b. may be drilled so that the injection direction C is oblique to the axis of the concrete pressure pipe 2 as shown in FIG. 2(a), or perpendicular to the axis as shown in FIG. 2. Arrow CF in Fig. 3 indicates the direction in which poured concrete is pumped.

Here, the discharge pressure of the liquid quick-setting agent by the above-mentioned high-pressure or ultra-high-pressure pump is preferably about 200 to 500 kg/cm''.

By injecting the liquid quick-setting agent at such a high discharge pressure into the poured concrete, the injection line L of the liquid quick-setting agent can be directed into the poured concrete as shown in Fig. 3(a). Not only are they formed sequentially, but also as shown in Figure fb)
The injection line L collides with the coarse aggregate in the poured concrete, and the injected liquid quick-setting agent is broken up and dispersed and mixed into the poured concrete.

Furthermore, in FIG. 3 (cl), the injection lines L and L from the supply port 4.4 collide with each other, and here the liquid quick-setting agent is broken due to mutual collision of the injected liquid quick-setting agent. It will scatter.

In addition, if the injection line L hits the inner wall 2c of the concrete pressure pipe 2 as shown in the same figure (dl), the liquid quick-setting agent will also be splashed and mixed into the poured concrete. In addition, the injection line L is actually constituted by a liquid quick-setting agent that is injected in a honeycomb shape because the discharge pressure is high.

FIG. 4 shows the device shown in FIG. 1 in more detail, and the same reference numerals indicate the same parts. The chemical supply tank is shown.

Furthermore, FIGS. 5 and 6 show an example of a liquid quick-setting agent injection device 9 equipped with the nozzle 5, which is attached to a fixing bracket 9a attached to the injection part 2b of the concrete pressure pipe 2. The rotary injection shaft pipe 9c is fixed so as to be perpendicular to the concrete pressure feeding pipe 2 by means of a fixing fitting 9b attached thereto.

The rotary injection shaft pipe 9c is equipped with a hydraulic motor 9d, a swivel joint 9e, and a rotary shaft pipe 9f having the nozzle 5 described above. The quick-setting agent is supplied, and the nozzle 5 is inserted into the supply port 4 which stands upright and opens in the concrete pressure pipe 2, and the tapered end wall of the nozzle 5 has a required number of end spout holes 5a. is opened.

In the figure, 8a indicates a hose joint.

When using the above-mentioned injection device 9, the nozzle 5 is rotated around its axis by the hydraulic motor 9d, so the liquid quick-setting agent pumped by the high pressure or ultra-high pressure pump 6 is passed through the supply hose 8. , the end jet hole 5 of the nozzle 5
From a, it is injected into the poured concrete flowing through the concrete pressure feed pipe 2 at a high or ultra-high pressure of 200 to 500 kg/cm''.

Here, RL in FIG. 6 indicates a rotating injection line from the end injection hole 5a, and α indicates its injection angle.

Next, FIGS. 7 and 8 show a case in which the above-mentioned concrete pressure feeding pipe 2 is provided with multiple supply ports 4 instead of a single supply port 4, and the opening positions of these supply ports 4 are relative to each other. , are set to be shifted in the circumferential direction and the longitudinal direction, and by doing so, the liquid quick-setting agent can be further sufficiently mixed into the poured concrete by each rotating injection line RL.

Here, the liquid quick-setting agent may be injected from multiple supply ports 4 at the same time, sequentially, or continuously or intermittently, but it is always constant with respect to the pumped amount of poured concrete. It is better to inject liquid quick-setting agent.

Next, FIGS. 9 and 10 show an apparatus used for carrying out the method according to claim (4), in which the concrete pump 1 is used to pump concrete into a pressure pipe 2.
The poured concrete is supplied through a discharge port 2'a attached to a movable weir plate E to a pouring point A through a slit formed in the ground B as is known. At this time, the movable weir plate E is moved in the direction of the arrow F, and the provision of the concrete is continued.

In the present invention, at this time, the movable end plate H is brought into contact with the surface G of the provided placed concrete G filled in the placing place A.
The upright supply port 4a is opened, and the movable end plate H is provided with an injection device 9 having the same configuration as described above, and the movable end plate H is moved in the direction of the arrow F together with the movable weir plate E. will be migrated.

By doing as described above, the liquid quick-setting agent that has been pressure-fed from the high-pressure or ultra-high-pressure pump 6 via the supply hose 8 is delivered to the surface G1 of the poured concrete G through the nozzle 5 in the injection device 9. From the end spout hole 5a, the supply port 4a
This is injected through the surface layer G2, which is the required depth of the poured concrete G, and quickly solidifies the surface layer G2, so it is poured from the gap between the moving end plate H and the ground B This will prevent the poured concrete G from leaking out.

The nozzle 5 with the end spout hole 5a of 22/1000 inches is 2
Using this method, when injecting the liquid quick-setting agent into the concrete pressure pipe 2 at an injection angle of 60', the rotation speed of the nozzle 5 is set to O.
~500 rpm, discharge pressure 200~500 kg/c
m”, the amount of poured concrete is approximately 20Of2/lll
1n, the unit cement amount is 370 kg/m'', and the amount of quick setting agent added is about 5 to 7.6%.When various experiments were conducted, it was found that the liquid quick setting agent was sufficiently mixed into the poured concrete. In this case, the nozzle does not need to rotate, but
It is more efficient to rotate the nozzles, and it is desirable to have a large number of nozzles.When the nozzles are not rotated, it is better to increase the number of nozzles.However, by increasing the number of nozzles, it is difficult to If the aperture is made too small, it will cause blockage, so care must be taken, but it has been confirmed that rotating the nozzle as described above is effective in preventing such blockage.

Of course, the higher the discharge pressure from the high-pressure or ultra-high-pressure pump 6, the more desirable it is, but 500 kg/c+o"
If the discharge pressure is lower than this, the desired effect can be achieved by rotating the nozzle, changing the number of nozzles, or even moving the nozzle in the horizontal direction. The hardening start time of concrete is also
It was possible to set the time to about 30 seconds to 60 seconds.

(Effects of the Invention) Since the present application can be carried out as described above, in accordance with claim (1), liquid quick-setting agent can be injected by a high-pressure or ultra-high-pressure pump to the conventionally placed concrete. Unlike the injection of quick-setting agents, the impingement phenomenon on the honeycomb-shaped injection mixed coarse aggregate results in a satisfactory homogeneous mixing in a short time.

According to claim (2), the rotation of the nozzle expands the spray range of the liquid to speed up uniform mixing, prevents clogging of the jet hole at the end of the nozzle, and increases the number of nozzles. Uniform mixing is further promoted.

In claim (3), since the liquid quick-setting agent is injected into the poured concrete in the concrete pressure pipe,
The injected liquid quick-setting agent collides with the inner wall of the concrete pressure pipe, causing the crushed pieces to scatter, thereby further promoting the dispersion and mixing. Dispersion and mixing can also be improved by adding more supply pipes.

In the case of claim (4), since the liquid quick-setting agent is injected from the movable end plate using a high-pressure or ultra-high-pressure pump, only the surface layer of the poured concrete is quickly hardened, and a small amount of liquid quick-setting agent is Just by using the agent, it is possible to complete this type of construction work efficiently.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the usage state of an example of an apparatus that can be used to carry out the method according to claim (3) of the present application, and FIG. 2 (at
fbl is a longitudinal sectional front view of each different type showing the injection part of the concrete pressure pipe in Fig. 1, and Fig. 3 fa) fb) t
el fd) is a longitudinal sectional front view of various examples showing the injection line of the liquid quick setting agent in the same concrete pressure pipe, Figure 4 is an explanatory diagram of the usage state showing a specific example of snow making in Figure 1, and Figure 5 is
The figure is a front view according to claim (2) showing the injection device of Figure 4, Figure 6 is a cross-sectional view taken along the line ■-IV of Figure 5, and Figure 7 shows the dissimilar injection part of the concrete pressure pipe. 8 is a side end view of the injection part, FIG. 9 is an explanatory bottom view of the device in use, showing an example of the apparatus for carrying out the method of claim 41, and FIG. 1... Concrete pump 2... Concrete pumping section 4.4a... Supply port 5... Nozzle 5a...・End spout hole 6...High pressure or ultra-high pressure pump 8...
Supply hose E...Moveable weir board H...Moveable weir board agent Patent attorney Yoshi Sai Fuji Zaishi 1 Figure 2 Figure 3 Figure 114 Figure 'ym Figure 5 Figure 9 Rin Figure 10

Claims (4)

[Claims] (1) A liquid quick-setting agent is force-fed through a supply hose using a high-pressure or ultra-high-pressure pump, and the pumped liquid quick-setting agent is cast at the required location from the spout hole at the end of a nozzle provided in the supply hose. A method for mixing a quick-setting agent into poured concrete, characterized by spraying the agent onto the concrete. (2) A liquid quick-setting agent is pumped through a supply hose by a high-pressure or ultra-high-pressure pump, and the liquid is pumped from one or more end spout holes of a nozzle whose rotation center is an axis provided in the supply hose. A method for mixing a quick-setting agent into poured concrete, characterized in that the liquid quick-setting agent is sprayed onto the poured concrete at a required location. (3) A liquid quick-setting agent is force-fed through a supply hose using a high-pressure or ultra-high-pressure pump, and the liquid quick-setting agent is poured into the concrete from the spout hole at the end of the nozzle provided in the supply hose to the place where concrete is to be poured. A pouring method characterized in that the poured concrete sent by a pump through a concrete pressure feed pipe is injected through one or more supply ports provided in the concrete pressure feed pipe closer to the pouring location. How to mix quick setting agent into concrete. (4) A liquid quick-setting agent is force-fed through a supply hose using a high-pressure or ultra-high-pressure pump, and the liquid quick-setting agent is poured into concrete from the nozzle end spout hole provided in the supply hose to the place where the concrete is to be poured. A pouring method characterized in that the poured concrete supplied by a pump through a movable weir plate by a concrete pressure pipe is injected through a supply port of a movable end plate that is in contact with the surface of the poured concrete. How to mix quick setting agent into concrete.