JPS61229506A - Concrete cooling nozzle device for truck mixer - 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] (Industrial Application Field) This invention involves inserting a nozzle into the drum from the hopper section of a truck mixer, and injecting liquefied gas from this nozzle toward the concrete inside to cool the concrete. This invention relates to a nozzle device.

<<Prior Art>> When concrete is manufactured in hot weather, the mixing temperature becomes high, the unit amount of water required to obtain the same consistency increases, and the unit amount of cement required to achieve the same water-cement ratio also increases. In addition, the drop in slump during transportation increases, and the unit amount of water and cement must be further increased. This is not only uneconomical, but also increases the temperature rise due to heat generation of cement, increases drying shrinkage, and increases the possibility of defects such as cracks occurring. Furthermore, the curing process becomes faster, and the time allowed for pouring joints becomes shorter, making construction difficult.

In addition, in mass concrete, since concrete is a poor conductor of heat, the internal temperature rises as it hardens and heats up, creating a wide temperature difference between the inside and outside surfaces, making surface cracks more likely to occur.

On the other hand, when concrete is restrained from the outside, the shrinkage caused by the temperature drop after hardening is also restrained, generating large tensile stress.

For these reasons, for hot concrete and mascocycrete, it is necessary to take measures to keep the temperature of the mixed concrete to a certain degree low.

Conventionally, in order to keep the mixing temperature of concrete low, methods such as cooling cement, aggregate, water, and other materials, and using crushed ice in the mixing water were used.

(Problems to be Solved by the Invention) Methods for cooling materials such as cement, aggregate, and water have low cooling effects and are difficult to control quality as cooling equipment becomes large-scale. The method of using crushed ice also requires large-scale ice-making equipment, and it is difficult to appropriately control the temperature and moisture content of the concrete.

Conventionally, the above-described cooling method requires large-scale equipment, so it has been implemented in concrete plants. Therefore, when concrete is transported by truck mixer to a concrete placement site remote from the plant, the temperature of the concrete will rise at the placement site even if it is cooled at the plant stage.

This invention was made in view of the above-mentioned background, and its purpose is to use a very simple liquefied gas as a cooling source, and to cool the inside of the drum when the concrete is transported to the casting site using a truck mixer. A simple truck mixer that can effectively cool concrete in a short time.
An object of the present invention is to provide a concrete cooling nozzle device for use in concrete cooling.

(Means for Solving the Problems) The concrete cooling nozzle device for a truck mixer according to the present invention has a nozzle for injecting liquefied gas at the tip, and a liquefied gas supply hose at the rear end or the middle. A connected elongated rod-shaped nozzle unit, an elongated slide rail that guides and supports the rod-shaped nozzle unit so as to be slidable in its longitudinal direction, a tilting mechanism that vertically rotates the slide rail to position and fix it, and the slide. It is equipped with a turning mechanism that horizontally rotates the rail to position and fix it, and a fixing mechanism that fixes the entire rail to a suitable support object.

(Function) This nozzle device and a liquefied gas tank are prepared at the pouring site, and the concrete in the drum is cooled when the truck mixer that transports the concrete from the plant arrives. The entire device is mounted at an appropriate height using the fixing mechanism, the slide rail is directed toward the hopper side of the track mixer using the rotating mechanism, and the slide rail is made almost parallel to the rotation axis of the drum using the tilting mechanism. The rod-shaped nozzle unit is advanced along the slide rail, and the nozzle at the tip thereof is inserted into the drum. Then, while mixing the concrete in the drum, liquefied gas is ejected from the nozzle, and the latent heat and apparent heat of the liquefied gas quickly and evenly cools the concrete.

(Embodiment) FIGS. 1 to 3 show the configuration of a nozzle device according to an embodiment of the present invention, and FIG. 4 shows the state in which this nozzle device is used.

Reference numeral 10 denotes a rod-shaped nozzle unit, which includes an elongated plate-shaped slide stand 10a with a dovetail 10b formed on the lower surface, and a slide stand 10.
A pipe member fixed to the top surface of a.

10c and a nozzle 10d attached to the tip of the pipe member 10c, and a flexible hose 12 is connected to the rear end of the pipe member 10C. This hose 12
is connected to a storage tank for liquefied gas (for example, liquid nitrogen), not shown.

Reference numeral 14 denotes a slide rail, and a dovetail groove 14a is formed along the longitudinal direction on the upper surface of the slide rail. The dovetail groove 14a is fitted with the dovetail 10b of the slide base 10a, so that the rod-shaped slide unit 10 is attached to the slide rail 1.
4 in the longitudinal direction and can be fixed in any position by suitable frictional forces.

16 is a C-shaped clamp for fixing the entire device to some kind of support object, and has a clamp port 16a and a clamp port 16a facing it. -16b, firmly clamp the supporting object between the two.

Reference numeral 18 denotes a bearing integrally provided on the upper surface side of the C-type clamp 16', the shaft hole of which is formed in the vertical direction; The provided vertical shaft 2'Oa is fitted.

The vertical shaft 20a is supported by a bearing 18' and is rotatable, but can be fixed at any rotational position by tightening a fixing bolt 18a attached to the bearing 18.

As shown in FIG. 2, the rail support 20 is in the shape of a trowel, and the intermediate portion of the guide rail 14 is sandwiched between the support 20 and the rail 14 from both sides. The slide rail 14 is rotatable in the vertical direction about the horizontal axis 20b. Protrusion of horizontal shaft 20b
A tightening nut 20c is attached to the screw, and by strongly tightening this nut 20C, the rail 14 is firmly clamped by the rail support 20.
The rail 14 can be fixed at any inclination angle.

This is the tilting mechanism mentioned above.

Furthermore, the slide rail 14 is also rotatable in the horizontal direction about the vertical axis 20a, and can be fixed at any rotational position with a fixing bolt 18a. This is the aforementioned turning mechanism.

Next, the usage status of this device will be explained. In FIG. 4, 22 indicates a truck mixer, 22a is a drum mounted on the chassis of the truck, and 22b is a drum 22.
This is a hopper installed in line with the opening on the rear end side of a. The drum 22a is inclined with the rear end side raised high, and is rotationally driven around a turning wheel 220.

A suitable support object 24 is provided behind the truck mixer 22, to which the device is fixed with a C-shaped clamp 16. Then, the rod-shaped nozzle unit 1 is attached to the slide rail 14.
0 is in a retracted state, these are rotated around the vertical axis 20a, and positioned so that their tip portions face the hopper portion 22b. Rotate the slide rail 1.4 and the rod-shaped nozzle unit 10 in the vertical direction around the horizontal axis 20b, and tilt it appropriately so that the tip side faces downward.
It is set at a position substantially along the rotation axis 220 of the drum 22a. Then, the rod-shaped nozzle unit 10 is slid along the slide rail 14 and stretched, and its tip end is inserted into the drum 2, 2a through the hopper part 22b.

The rod-shaped nozzle unit 10 is the rotating shaft 22c of the drum 22a.
What is ihira ゛! If this is very close to □, drum 2
．． 'Rotate 2a, 2'°"'"2', 4'"".

So drum 22. Knead the concrete inside by rotating base a;
, gas is supplied and the liquefied gas is pumped from the nozzle 10d.
Inject into the tanks 2 and 2a. The concrete is rapidly cooled by the latent heat and sensible heat of this liquefied gas, and the entire concrete is evenly cooled by the rotation of the drum 22a.

The vaporized gas dissipates into the atmosphere from the hopper portion 22b.

Concrete to the appropriate temperature! If cold >, = 1, L, then slide the rod-shaped nozzle unit 10 and retract it, and the ::, l,, ::::, :: of the hopper part 22b.
Uni 1, 22 = 22 ninini 222.1.

゛If the nozzle unit 10 is moved, the book, the device, the truck, and the pick mixer 22 will not interfere with each other.

(Effect of the invention) 9゜7:';''II=:), =2 nose;222,:R::::
：If a storage tank for chemical gas is prepared at the concrete pouring site, there is no need to equip the concrete plant with large-scale cooling equipment like in the past, and the concrete that has been transported by truck mixer □It can be cooled quickly before installation, and it can be successfully installed even in hot summer concrete or mass concrete.
, - It's a very convenient thing to do.
1.

Fig. 1 is a front view of a concrete cooling nozzle device according to an embodiment of the present invention, Fig. 2 is a view taken along arrow B in Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 1, and Fig. 4 is a It is a schematic diagram showing the use state of the device same as the above.

10... Rod-shaped nozzle unit 12... Hose 14... Slide rail 16... C-type clamp 18...
... Bearing part 20 ... Rail support body 20a.
...Vertical axis 20b...Horizontal axis 22...Track mixer 22a...Drum 22b...Hopper~24
...Supported object patent applicant Obayashi Co., Ltd. Representative Patent attorney - Kensuke Shiro Figure 2 Figure 3

Claims (1)

[Claims] (1) A device that cools concrete by inserting a nozzle into the drum from the hopper part of a truck mixer and injecting liquefied gas from the nozzle toward the concrete inside. A slender rod-shaped nozzle unit to which a liquefied gas supply hose is connected to an end or a middle portion, a slender slide rail that guides and supports the rod-shaped nozzle unit so as to be slidable in the longitudinal direction, and a slender slide rail that rotates the slide rail in a vertical direction. A concrete cooling nozzle for a truck mixer, comprising a tilting mechanism that moves the slide rail to position and fix it, a turning mechanism that horizontally rotates the slide rail and fixes it in position, and a fixing mechanism that fixes the whole of these to a suitable support object. Device.