JPH0510646U - Wet concrete spraying machine - Google Patents

Abstract

(57) [Summary] [Purpose] Allows spraying of low slump concrete,
The sprayed concrete is a high-quality concrete with high strength and low shrinkage. [Structure] When the rotor 4 is rotated and the fresh concrete C sprayed into the hopper 1 is poured, the fresh concrete C in the hopper 1 is dropped into each distribution chamber 8 through the openings 12 and 13, and the fresh concrete enters. When the distribution chamber 8 is rotated about half a turn, due to the action of the compressed air from the jet port 14,
It is discharged to the air chamber through the discharge port 16 and the hole 17. In the air chamber, another compressed air is supplied,
Due to this action, the fresh concrete C is pumped and sprayed through the nozzle.

Description

[Detailed description of the device]       [0001]     [Industrial applications]   The present invention is a wet concrete that sprays fresh concrete put into a hopper. Regarding spraying machine.       [0002]     [Prior Art]   Conventionally, as a concrete spraying machine, it has already been manufactured at a batcher plant etc. Wet method of supplying and transporting ready-mixed concrete and spraying it; dry or dry A concrete material containing water is supplied to a spraying machine, and the concrete material is piped. While transporting inside pipes such as hoses and so on, adding water in the middle It is known that the dry method of spraying and spraying it. The former wet type concrete The spraying machine supplies the fresh concrete into the transport pipe, and the supplied fresh concrete Push the concrete pump into the transfer pipe one by one, and let the compressed air near the nozzle. Inject the air to loosen the concrete that has been consolidated, and use the air to spray the nozzle. It was spraying from.       [0003]   Further, as the latter dry type concrete spraying machine, for example, JP-A-57-2 is used. As described in Japanese Patent Publication No. 09366, the rotor is driven to rotate, and The pocket that arrived at the position is filled with dry mix material, and the pocket is no Compressed air from the air blowing holes when communicating with the Pneumatically transport to hose. And for the dry mix material being transported in the transport hose A quick-setting agent and water are added and it is made into concrete and sprayed.       [0004]     [Problems to be solved by the device]   In the former wet concrete spraying machine, fresh concrete is pumped into a concrete pump. Since it is pushed into the transfer pipe with, resistance occurs between the green concrete and the inner wall of the transfer pipe, The problem that fresh concrete with low pumpability cannot be sent because it is clogged with a carrier pipe There was a problem. Therefore, to prevent clogging, the raw concrete with a large slump value It is used to spray concrete, but in such fresh concrete, concrete is sprayed. Due to its low cleat strength and poor quick-setting property, low quality sprayed concrete There are many quality tunnel constructions, loss of materials, and sprayed concrete after spraying. There was also a risk of accidents caused by falling.       [0005]   In the latter case of dry type concrete spraying machine, the dry mix material is being conveyed. Since water is added in, the amount of water added is sensed by humans, and it is difficult to control W / C. It Moreover, due to insufficient mixing of dry mix materials and water, good quality and stability It is impossible to produce concrete that has been sprayed, and there is a large amount of rebound of sprayed concrete. In addition, there is a problem that a lot of dust is generated, which is not good for the hygiene of the people working in the mine. It was       [0006]   The present invention is a wet type that eliminates the above-mentioned problems in the conventional concrete spraying machine. The purpose is to provide a concrete spraying machine.       [0007]     [Means for Solving the Problems]   In order to solve the above-mentioned problems, the present invention provides a large number of distribution chambers on the circumference and A rotor that rotates around a line and a part of the rotor that is placed on the distribution chamber Hopper for dropping the ready-mixed concrete into the distribution chamber, and dropping the hopper It is installed at a position almost opposite to the center position of the rotor and the central axis of the rotor. A discharge port that communicates with the distribution chamber and a compression space provided above the discharge port and the rotor. And a discharging means for discharging the green concrete in the distribution chamber to the discharging port It is characterized by       [0008]     [Action]   According to the above configuration, the ready-mixed concrete produced in advance by the batcher plant or the like is used. , Put the rotor into the distribution chamber from the hopper, and blow out compressed air to the raw concrete inside the distribution chamber. Since the reed is discharged to the discharge port and sprayed, low slump concrete can be sprayed, High-quality concrete with high strength and low shrinkage can be obtained.       [0009]     【Example】   Embodiments of the present invention will be described with reference to the accompanying drawings.       [0010] 1 and 2, reference numeral 1 is a hopper, and 2 is a supporting plate for supporting the hopper 1. And 3 is an upper joint plate attached to the lower surface of the support plate 2. A rotor 4 is arranged below the upper joint plate 3.       [0011]   In this example, the rotor 4 is formed between the outer wall 5 and the inner wall 6 as clearly shown in FIG. The divided space is divided by a plurality of partition walls 7, so that the rotor 4 has a plurality of spaces. A distribution chamber 8 is provided. The drive shaft 9 is fitted in the center of the rotor 4, and 2, the rotor 4 rotates around the central axis in the direction of arrow A in FIG. Rotate to.       [0012]   A lower joint plate 10 is arranged under the rotor 4 to The base plate 11 is supported by the base plate 11. Upper and lower joint plates 3 , 10 have wear resistance and at least the friction coefficient of the surface in sliding contact with the rotor 4 It is made of small rubber material. In addition, the rotor 4 and the upper and lower joins A metal plate (not shown) that has been hardened and polished is interposed between each of the plates 3 and 10. Good.       [0013]   The supporting plate 2 of the hopper 1 has a peas-shaped opening 1 as shown in FIG. 2 is formed, and the upper joint plate 3 is also formed with an opening 13 having the same shape and position. Has been done. The openings 12, 13 are located on the distribution chamber 8 and their width is the width of the distribution chamber. And the edges of both are almost the same. That is, outside the openings 12 and 13 The edge is substantially coincident with the inner edge of the outer wall 5 of the rotor 4, and the inner edge is substantially coincident with the outer edge of the inner wall 6. Further, the lengths of the openings 12 and 13 are formed to be 2 to 3 times longer than the length of the distribution chamber 8. .       [0014]   Compress the upper joint plate 3 at a position almost opposite to the central axis of the rotor 4. An ejection port 14 is formed as an ejection means for ejecting air into the distribution chamber. The port 14 communicates with a through hole 15 formed in the support plate 2. In this through hole 15 Is connected to an unillustrated compressor supply hose, etc. By the operation of, the compressed air is supplied to the distribution chamber 8.       [0015]   On the other hand, the lower joint plate 10 has a position corresponding to the ejection port 14, that is, A discharge port 16 is provided just below the jet port 14. The discharge port 16 is similar to the distribution chamber 8. It is formed in a shape similar to or slightly larger than that, and is in communication with each distribution chamber 8 be able to. This discharge port 16 is shown through a hole 17 in the base plate 11. Not communicating with the air chamber.       [0016]   In the wet concrete spraying machine thus constructed, when the rotor 4 is first rotated, Then, the fresh concrete C to be sprayed is poured into the hopper 1. And the hopper Fresh concrete C in 1 is dropped into each distribution chamber 8 through openings 12 and 13, and When the distribution chamber 8 containing concrete is rotated about half a turn, compressed air from the ejection port 14 Is discharged to the air chamber through the discharge port 16 and the hole 17. D In the arc chamber, another compressed air is supplied, and by its action, the fresh concrete C Are pumped and sprayed through a nozzle (not shown). This kind of operation By repeating, the green concrete C is sprayed.       [0017]   Thus, the ready-mixed concrete C is sprayed toward the wall surface, etc. Compressed air is used to decompose raw concrete into small pieces, which are then removed by the force of compressed air. Since it uses an air transfer system that sends it to the user, the resistance inside the pipe is small and It is not necessary to increase the slump value of fresh concrete C, and Concrete C is sprayed, resulting in high strength, low shrinkage and high quality concrete Is obtained.       [0018]   By the way, since fresh concrete C is in a viscous mud state, It has already been explained that those having a small value do not fall into the distribution chamber 8.       [0019]   Therefore, as a result of various experiments, the present invention has revealed that the bottom of the hopper 1 or its In the vicinity, compressed air is continuously or disconnected in the fresh concrete injected into the hopper 1. A jetting means 18 for continuously jetting is provided, which will be described in detail below.       [0020]   The jetting means 18 in this embodiment is configured as a compressor (not shown). Through the compressed air supply device, the compressor, the control valve 19 and the joint 20 With a tough rubber hose 21 connected, the joint 20 near the top of the hopper 1. It is fixedly supported by the hopper 1 so as to penetrate the wall plate. The control valve 19 is In order to control the flow rate of the compressed air, it is necessary to arrange it near the joint 20. It is advantageous in terms of work. The rubber hose 21 has a fixing tool (Fig. The other end 21a is a free end, although it is inserted and fixed by a hopper (not shown). It has reached near the bottom of 1. The compressor is the same as the above-mentioned discharge means. It shares a compressor. In other words, as shown in the figure, It is branched.       [0021]   In the concrete spraying machine thus constructed, the fresh concrete C is put into the hopper 1. Then, the jetting means 18 is activated at the same time when the operation of the machine is started. Ejection means By the operation of 18, compressed air is continuously jetted from the rubber hose 21 into the concrete. Put out. As shown in FIG. 3, the interior of the green concrete C is mortared on the surface of the coarse aggregate 22. 23 is attached, and fine sand and mortar 24 are inserted between the coarse aggregates 22. When Rolling concrete C is filled with fine sand between each coarse aggregate 22 and mortar 24 is completely filled. There are few exhaustions and there are many voids. Especially, such a space is thrown into the hopper 1. It is remarkable in fresh concrete immediately after entering.       [0022]   Therefore, the compressed air ejected as described above is dispersed in the fresh concrete C. , A space between the coarse aggregates 22 or a portion where the pressure is weak is sewn and moved. Raw accompanying this move A vibration effect is produced in concrete C, that is, by the passage of compressed air. Coarse aggregate is moved. Therefore, the flow action is promoted in the fresh concrete C, and The cleats easily fall into the distribution chamber 8 of the rotor 4.       [0023]   Thus, by providing the jetting means 18, the raw concrete with a small slump value is obtained. Even if it is a table, it can be surely dropped into the distribution chamber. Moreover, the compressor Since it is also used as the discharge means, it can be applied to existing spray machines if a supply system path is provided. . Also, by using a rubber hose, even if it is damaged over time, it can be replaced immediately. Wear.       [0024]   Furthermore, the cavities caused by variations in the injection of fresh concrete are Although it was one of the concomitant damages caused by dropping, it is possible to destroy such cavities. Wear.       [0025]   An experiment was conducted under the following conditions using the wet concrete spraying machine of the embodiment shown in FIG. Was done.       [0026] 1) About 50 cm in height from the bottom of the hopper 1 with ready-mixed concrete with a slump value of about 10 cm Input up to cm, 2) Compressed air pressure is about 3000mm / q, the amount is 20l / min, 3) The other end 32a of the rubber hose 23 is about 3 to 5 cm above the bottom of the hopper 1. set on,   As a result, the compressed air is as if it were a gas ejected from a sulfur pond in a volcanic area. Then, it escapes to the surface of the ready-mixed concrete and the filling efficiency of the distribution chamber 8 is 90%. It is added that the efficiency was extremely high.       [0027]   The preferred embodiment of the present invention has been described above, but the present invention is only the above embodiment. It is not limited to the above, and various modifications can be made. For example, a metal tube instead of a rubber hose May be fixed to the wall of the hopper, and the compressed air is not continuous and the It may be controlled using an immer to intermittently eject.       [0028]     [Effect of the device]   The wet concrete spraying machine according to the present invention is constructed as described above. Put ready-mixed concrete manufactured in advance by such a plant as a sprayer into a spraying machine and spray it. Moreover, it is necessary to increase the slump value of the ready-mixed concrete like a pump type spraying machine. Since there is no slump, low slump concrete can be sprayed, resulting in high strength and low shrinkage. High quality concrete was obtained.

[Brief description of drawings] FIG. 1 is a front sectional view showing an embodiment of the present invention. FIG. 2 is a plan view showing an embodiment of the present invention. FIG. 3 is an enlarged explanatory view of green concrete. [Explanation of symbols] 1 ... Hopper 4 ... rotor 8 ... Distribution room 14 ... Spout 16 ... Discharge port 18 ... Spouting means C ... ready-mixed concrete

Claims (1)

[Claims for utility model registration] (1) A rotor provided with a large number of distribution chambers on its circumference, rotating around a central axis, and fresh concrete poured and arranged on a part of the distribution chambers of the rotor. A hopper for dropping the gas into the distribution chamber, a discharge port provided at a lower portion of the hopper at a position substantially opposite to the position where the hopper is dropped and the center axis of the rotor, and the discharge port and the rotor. A wet concrete spraying machine, which is provided above and through which compressed air is jetted to discharge fresh concrete in the distribution chamber to a discharge port. (2) In the concrete spraying machine according to claim 1 for utility model registration, jetting means for jetting compressed air continuously or intermittently into the fresh concrete put into the hopper at or near the bottom of the hopper. The wet concrete spraying machine is characterized in that: