JPH02272161A - Method and apparatus for concrete covering work - Google Patents

Abstract

PURPOSE:To raise the coating density of concrete as well as prevent the occurrence of dust by a method in which ready-mixed concrete is supplied from the tip opening of a supply tube to the periphery of a rotary brush and applied to the surface of wall by rotating the brush. CONSTITUTION:A supply tube 2 is supported by a multi-joint manipulator to enable it to move aptly to faces to be constructed, such as wall face, tunnel excavated face, etc. Ready-mixed concrete C is supplied from the supply port 21 of the tube 2 to the tip opening 22 of it. A rotary brush 5 radially planted with flexible brushes 52 consisting of stainless steel wire having great durability is then turned around the shaft 51. The concrete C supplied to the inside of the rotary periphery of the brushes 52 from the opening 22 is applied to the face 10. Since the concrete can be exactly pressed to raise the coating density due to the snapping action of the brush 5 and the occurrence of dust can also be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a construction method and apparatus for lining construction surfaces such as walls and tunnel excavation surfaces with concrete.

<Conventional Technology> In conventional concrete spraying, in which ready-mixed concrete is sprayed onto the excavated surface of the earth, the ready-mixed concrete is directly sprayed onto the construction surface using a large amount of compressed air. When ready-mixed concrete is sprayed with compressed air, a large amount of dust is generated, which worsens the environment at the construction site. In addition, the rebound phenomenon during spraying increases the bounce rate and many other problems.

Therefore, in recent years, a construction method has been adopted in which fresh concrete 1 is projected onto the construction surface using the centrifugal force of a rotor rotating at high speed within a casing. This construction method reduces the amount of dust generated without adding dust reducers, and it also does not degrade the environment at the construction site. Furthermore, the rebound rate can also be improved.

<Problems to be Solved by the Invention> However, since the projection of ready-mixed concrete is based on the centrifugal force of a rotor rotating at high speed, the adhesion force of the concrete to the wall surface is lower when compared to spraying using compressed air. Therefore, the density of concrete projected onto the construction surface is also reduced.

Furthermore, since the rotor rotates at high speed inside the casing, the rotor itself wears out due to the friction generated during rotation, causing damage to the rotor.
The durability of the mechanism is also low.

As mentioned above, there is still much room for improvement in the construction method described above from a practical standpoint.

Means for Solving the Problems> The present invention has been made to solve the above problems.
There is a construction method in which fresh concrete 1 is supplied from the tip opening of the supply pipe to the rotating outer circumferential surface of the rotary flange, and the concrete is applied by the rotary flange, and the concrete is supplied by a rotary brush or concrete I. When rotating, the flexible brush flexes, that is, this restoring force and the rotating force of the rotating brush cause the fresh concrete 1 to flex.
- is applied by pressing it onto the construction surface. Moreover, the lining device uses a rotating brush to apply the concrete supplied from the opening at the tip of the supply pipe to the construction surface, and the rotating brush has flexible brushes planted radially around the center of the shaft. The tip opening of the supply tube is arranged so as to face inside the rotating outer circumferential surface of the flexible brush.

<Function> Since the opening at the tip of the supply pipe for supplying concrete is arranged so as to face the inside of the rotating outer peripheral surface of the flexible brush, the concrete from ``I'' between the tips is arranged according to the amount of supply. It is sequentially extruded by a rotating brush and applied to the construction surface at a constant speed and application force.Furthermore, since the rotating brush has flexible brushes planted radially around the center of the shaft, there is no opening at the tip. When extruding concrete 1- from
The brush of helmet 1 is bent. When the brush separates from the "I" between the tips, it snaps into action as a reaction force to the deflection, that is, a restoring force, and reliably presses the ready-mixed concrete, causing it to be applied to the construction surface with this sufficient pressing force.

<Example> Next, the concrete 1 to lining method and apparatus of the present invention will be explained based on the drawings.

FIG. 1 is a front view of the concrete lining device l. Further, FIG. 2 is a sectional view taken along the line xx in FIG. 1.

The concrete lining device 1 consists of a supply pipe 2 and a rotating flange 5. The supply pipe 2 constitutes a so-called pipe body, and the ready-mixed concrete C supplied from a supply port 21 at one end thereof is supplied to the rotary flange 5 through a tip opening 22.

A screw conveyor 3 is provided within the supply pipe 2 as required. That is, by rotating the screw conveyor 3 using the screw motor M, an appropriate amount of fresh concrete C in the supply pipe 2 is kneaded and supplied (extruded) from the tip opening 22. If the screw conveyor 3 is not provided, the fresh concrete 1-C is pumped by a concrete pump installed in the subsequent unit 1 (not shown), and the fresh concrete 1-C is directly supplied from the tip opening 22 by this pumping force.

On the other hand, the rotating brush 5 is housed in the casing 4 and rotated in a predetermined direction about its shaft portion 51 by a rotating motor M2.

FIG. 3 is a diagram illustrating the rotating brush 5. FIG. That is, the shaft portion 5
Flexible brushes 52 are installed radially around center point 1. In this rotary flange 5, the flexible brush 52 is made by bundling the long brush S2a and the short brushes 52b and S2c, and each flexible flange 52 is intermittently implanted on the shaft portion 51. are doing. The rotating brush 5 is the shaft portion 51
When rotated around , the tip of each flexible flange 52 forms a rotating outer peripheral surface 0. The tip opening 22 of the supply pipe 2 is arranged so as to face the inside of the rotating outer circumferential surface 0. The long brush 52a and the short brushes 52b and 52c are all made of stainless steel wire or narrow plates, and form brush surfaces with great nf flexibility and durability. Instead of this, synthetic fiber or
You can also use one made of synthetic rubber. Moreover, these are configured to be replaceable with various types of rotating brushes, as will be described later.

Concrete lining T (painting construction) using the concrete lining device 1 shown in FIG. 2 will be explained. A concrete pump of a succeeding unit (not shown), a water supply pump, etc. are operated from an operation panel, and fresh concrete C is fed under pressure into the supply pipe 2 from the supply port 21. Then, if necessary, the mixture is kneaded and conveyed to the tip opening 22 by the screw conveyor 3.

When the rotary brush 5 in the casing 4 is rotated by the rotary motor M2 in this state, each flexible flange 5
2 rotates while being flexed in response to the supply of fresh concrete C,
The fresh concrete C is extruded, and the casing 4 is assembled using the restoring force due to the bending of the flexible brush 52 and the rotational force of the rotating flange 5.
The coating is surely applied from the discharge port 41 to the construction surface 10 such as a wall. Therefore, even if there is a distance H from the construction surface to the discharge port 41, the fresh concrete C is applied with sufficient pressing force due to the restoring force of the flexible brush 52 and the rotational force of the rotating brush 5.

The supply pipe 2 is supported by a multi-joint manipulator (not shown) and is configured to be movable as appropriate with respect to the construction surface IO.

FIG. 4 shows another embodiment of the rotary brush, in which a rotary flange 6 has flexible brushes 62 similar to those described above planted around a shaft portion 61 at the same length and approximately uniformly. . Therefore, the tip of the flexible brush 62 has a substantially circular shape with the shaft portion 61 as the center. FIG. 5 shows still another embodiment, in which the rotating brush 7 has short brushes 72c, 72d, etc. installed between flexible long brushes 72a and 72b around a shaft portion 71. The surface is formed into an uneven shape. This rotating brush 7 can also generate sufficient coating force through its restoring force and rotational force as described above. Furthermore, the rotating brush 8 in FIG.
A flexible brush 83 is installed on top. The flexible flange 83 has a soft long brush 83a and a hard brush 83.
b are planted alternately.

From among the above-mentioned rotating brushes, an appropriate one is selected in consideration of the workability of the fresh concrete C to be applied. Furthermore, by selecting the elasticity of the material, length, etc. of the flexible flange itself, and selecting the number of rotations of the rotating brush itself, it is possible to perform good coating work. Furthermore, since the present invention uses a flexible flange, it is also possible to bring the flexible flange 83 (8:la, 83b) close to or in contact with the construction surface 10. Therefore, as shown in FIG. 7, the fresh concrete 1-
Even if C is highly fluid, it can be easily applied. Moreover, if the long brush 83a is brought into contact with the construction surface 10 and applied, the reaction force of the bending by the soft long brush 83a and the hard short brush 83b, that is, the restoring force, presses the ready-mixed concrete C against the construction surface 10, resulting in a good coating. Painting construction is possible. Moreover, if the rotary flange 8 continues to rotate, the surface of the coated fresh concrete C will be covered by the soft long brush B3.
Equalized by a.

As a result, only the surface of concrete 1-C can be leveled at the same time, and construction safety is also ensured compared to the conventional high-speed rotating rotor.

<Effects of the Invention> As explained above, the concrete lining method and its device of the present invention apply fresh concrete to the construction surface using a rotating brush. It can be applied to the concrete and the density of the concrete can be improved. Furthermore, even when the rotary brush is rotated at high speed, the blades are made of highly durable flexible brushes, so there is no failure due to wear or the like, and safety is sufficient.

As described above, it is possible to perform concrete lining with extremely good workability while preventing the generation of dust and reducing the rebound phenomenon.

[Brief explanation of drawings]

Fig. 1 is a front view of the concrete lining device of the present invention, Fig. 2 is a sectional view taken along the line X-X in Fig. 1, Fig. 3 is a diagram illustrating the rotating brush, and Fig. 4 is: FIG. 5 is a diagram explaining another rotating brush. FIG. 6 is a diagram explaining another rotating brush. FIG. 7 is a diagram explaining another construction example. It is a diagram. 1... Concrete 1 ~ lining equipment. 2... Supply pipe, 21... Supply port. 22...Tip opening, 4...Casing. 5.6, 7.8...Rotating brush. 51.61, 71.81...Shaft part. 52.62, 72.83...Flexible flange. 9... Supply pipe, 91... Tip opening. 0...Rotating outer peripheral surface, C...Ready-mixed concrete. 10...Construction aspect. Patent applicant Kumagai Gumi Co., Ltd. Agent Patent attorney Kuninori Funahashi × b Figure 5

Claims (3)

[Claims] (1) Fresh concrete supplied from the tip opening of a supply pipe into the rotating outer peripheral surface of a rotating brush is applied to the construction surface by the rotating brush, and when the rotating brush receives the supply of concrete and rotates; A concrete lining method characterized by applying fresh concrete to a construction surface by pressing it using the restoring force of a flexible brush and the rotational force of a rotating brush. (2) The ready-mixed concrete lining method according to claim 1, wherein the ready-mixed concrete is pressed against the construction surface and the surface of the ready-mixed concrete is leveled with a flexible rotating brush. (3) A concrete lining device that applies ready-mixed concrete supplied from the opening at the tip of a supply pipe to a construction surface using a rotating brush, the rotating brush being flexible brushes radially centered around the shaft. 1. A concrete lining device, wherein the supply pipe has a tip opening facing inside the rotating outer circumferential surface of the flexible brush.