JPH01284673A - Spray concrete mixing/accelerating device - Google Patents

Abstract

PURPOSE:To reduce bouncing and dust and improve quality by providing a conveying function section, an adding function section, a mixing function section, and a rectifying function section, suppressing the conveyance and acceleration to the minimum required, and applying the optimum spray acceleration according to the situation on the site. CONSTITUTION:A conveying function section is constituted of a conveyance pipe 5 and a conveyance acceleration nozzle 6 and a spray acceleration nozzle 7, an adding function section 2 is constituted of a water feed nozzle 8 and an addition nozzle 9, a mixing function section 3 is constituted of a mixing tube 10, and a rectifying function section 4 is constituted of a rectification pipe 11 and a rectification blow nozzle 12 respectively. For wet spraying, the concrete discharged by a concrete pump 13 is air-accelerated by the nozzle 6, the optimum spray acceleration is applied by a nozzle 7 at the tip of the pipe 5. The concrete is re-mixed by the pipe 10, a binder or the like is added through the nozzle 9, the concrete is rectified and sprayed through the nozzle 12 to an object. The quality of concrete can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to equipment used for spraying concrete on excavated inner walls in tunnel construction, cutting slopes, and other applications.

(Conventional Technique C) There are two types of concrete spraying equipment: dry type and wet type. The dry type conveys SII concrete materials such as old materials, sand, and cement by air, and adds water and quick-setting agents during the process. In the wet method, pre-mixed concrete is conveyed through the air and an accelerating agent is added to it before being sprayed.

In either case, the air is accelerated at the conveyance source and sprayed from the nozzle at the tip. There is no distinction between acceleration and spraying, and excessive acceleration pressure is applied, resulting in insufficient mixing in the case of the dry type, and insufficient mixing in the case of the wet type. In the case of
+1 occurs, and since insufficiently mixed or chopped concrete is sprayed as is, the quality varies, there is a lot of splashing, and there is a lot of dust, which are unavoidable causes.

(Problems to be Solved by the Invention) As a result of many years of research, the inventor discovered the above-mentioned problems with sprayed concrete, and has been working to solve these problems. The first point in solving the problem is to separate the conveyance acceleration and the spraying acceleration, to minimize the conveying force of 10 cars, and to accelerate the spraying to the optimum speed at the tip. The second method is to thoroughly mix and remix concrete at the tip of the sprayer, which is insufficiently mixed in the dry method, or separated in the wet method, to form concrete and spray it. Conventional spraying was called concrete and was spraying something that was not in the form of concrete, so it bounced back, but with the present invention, if the original concrete is sprayed after sufficient 4H mixing, Since the cement milk functions well as an adhesive and adheres to the object, high-quality construction is possible, and splashing and dust are reduced or eliminated (Example) Figure 1 shows the entire configuration of the present invention. An overview is shown. The conveyance function section 1 consists of a conveyance pipe 5 (or hose), a conveyance acceleration nozzle 6 at the conveyance source, and an accelerating nozzle 7 provided at the conveyance destination,
The addition function section 2 consists of a water addition nozzle 8 and an additive nozzle 9, and the mixing function section 3 consists of a water addition nozzle 8 and an additive nozzle 9. 110, and the rectifying function part 4 consists of a rectifier pipe 11, a rectifying jet nozzle 12, etc.As an accompanying device, 13 is a concrete pump, 14 is a compressor, 15 is a jA additive tank,
] 6 indicates a water pump. Taking wet spraying as an example, the concrete discharged from the concrete pump 3 is air-accelerated by the conveying acceleration nozzle 6, conveyed through the conveying pipe 5 of the required length, and is sprayed at the tip of the conveying pipe 5. The acceleration nozzle 7 provides the optimum acceleration for spraying.

Although the minimum necessary acceleration pressure is generated by the conveyance acceleration nozzle 6 to convey the material through the conveyance pipe 5, it is inevitable that concrete will be produced to a greater or lesser extent during conveyance. In the case of the wet method, there is no need to add water, and when the concrete enters the mixing pipe 10, it is mixed by the mixing function of the mixing pipe 10, and the concrete is mixed into the additive nozzle 9. A quick-setting agent, a thickener, etc. are added, and the flow is further rectified by the rectifier pipe 11, and is sprayed onto the object while being surrounded by the fumes of the rectifier jet nozzle 12 (details will be described later).Mixing function section 3 and the rectifier function The reason why the parts 4 are separated by a slight distance is that the mixing function part 3 is placed on the ground and the nozzle man can easily operate the rectifying function part 4 by holding it in his hand.

FIG. 2 shows another example of the invention. Taking dry spraying as an example, when concrete composition materials such as aggregate, sand, and cement are sent from the tank 17, they are air accelerated by the conveyance acceleration nozzle 6, and the rough spraying is carried out by the acceleration nozzle 7. The water addition nozzle 8 and the additive nozzle 9 of the addition function section 2
Water, quick-setting agents, etc. are added to the composition. When these enter the mixing pipe 10 of the mixing function section 3, the mixing function J:
The liquid is remixed, rectified by the rectifier pipe 11, and sprayed. While the example in FIG. 1 is used for manual operation, the example in FIG. 2 is suitable for spraying using a robot.

FIG. 3 shows an example of the mixing function section 3. The mixing function section consists of a required number of stages of mixing tubes, and the first stage mixing tube 10-1 has a required length and a required number of spiral wings 18 on the inner wall of the tube. A second stage ifM joint pipe 10-2 is provided in contact with the first stage mixing pipe io-. The two-stage mixing tube 10-3 is the first-stage mixing tube 10-, (+)
Double the wing 18: It has a wing 19 whose phase is different from the direction of rotation, and is further provided with such a 41'4 configuration and a required number of mixing tubes having such an arrangement. Although only two layers are shown on the sub-side, practically four layers are provided. Concrete transported from the transport pipe enters the first stage mixing pipe] When entering 0-4, wing 18 makes a right turn! J, picked up, two-stage mixing tube] After entering O-3, the concrete moves forward while being given a left turn, and as it passes through the required number of mixing tubes, the mixture is turned around and the concrete becomes uniform.]・
is formed.

FIG. 4 shows the arrangement of the wing J8 in the direction of arrow A-A in FIG. 3. Although 18-1 and 18-2 are arranged symmetrically on the sub-side, a symmetrical Jl-1 is preferable in order to scoop and mix the cement milk flowing under the pipe.

FIG. 5 shows the rectifying function section 4 in FIG.

Concrete conveyed from the right side in the figure is converged and rectified by a rectifying pipe 11, and is sprayed while being accelerated while being surrounded by the jet of a rectifying jet nozzle 12 fired at the outer periphery of the outlet of the rectifying pipe.

FIG. 6 shows the rectifier tube 11 in FIG. 2. A straightening pipe 11 is provided in contact with the final stage mixing pipe 20, and has straightening blades 21 parallel to the axis of the straightening pipe 1. Concrete given swirling motion by the mixing pipe 20 is rectified into a direct current and blown. Can be attached. Since concrete is immediately sprayed from the mixing pipe, the rectifying jet nozzle shown in the example in FIG. 5 is not used.

(Effects of the Invention) As is clear from the detailed description of the embodiments, the present invention separates conveyance acceleration and spraying acceleration (conception)! L.

Well, the conveyance acceleration should be kept to the minimum necessary to reduce the amount of concrete.
ME @ Suppression, spraying is accelerated depending on the site situation
In addition to providing suitable acceleration, insufficient dry mixing is also required.
Wet separated concrete l) -1- is mixed in a mixing tube,
1] The quality of the concrete is improved by mixing to form concrete, and the rectification function allows for spraying with less scattering, which improves the quality of the concrete and enables spraying with less splashing.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are schematic diagrams showing the entire configuration of the present invention. Figure 3 is the mixed function section! 3, and FIG. 4 shows the arrangement state of the wing 18 in the direction of arrow A-A in FIG. 3 (0). FIG. 5 shows the rectifier section 4 in FIG. 1, and FIG. 6 shows the rectifier tube in FIG. 2.

Claims (1)

[Claims] It consists of a conveyance function section, an addition function section, a mixing function section, and a rectification function section.
It consists of a conveyance acceleration nozzle that accelerates a concrete composition material such as cement to an appropriate conveyance speed and spraying speed, and a spray acceleration nozzle, etc., and the addition function part is configured to:
It consists of a water nozzle, an additive nozzle, etc. that adds water, quick-setting agent, etc., and the mixing function unit mixes the composition materials, water, quick-setting agent, etc. to form concrete, or recycles concrete separated during the transportation process. It is equipped with a mixing pipe that has a mixing function, and the rectifying function section consists of a rectifying pipe that rectifies the concrete mixed and remixed in the mixing function section, a rectifying jet nozzle, etc., and the optimal blowing is achieved by the composite configuration of each functional element. A shotcrete mixing accelerator characterized by enabling the construction of concrete.