JP2002177903A - Method for cleaning concrete surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently carry out cleaning work so that laitance scraps and the sand component of concrete are not left on the concrete surface. SOLUTION: A plurality of nozzles 12 are arranged at the prescribed intervals in the upper part of the surface 10 of the concrete to be cleaned for jetting high-pressure water W. A nozzle unit 16 is constituted of the nozzles 12 by integrating with a rotating body 14. When the surface 10 is cleaned, plural nozzles 12 are arranged in a row so that the fan-shaped region of the water W jetted from one nozzle is overlapped on that jetted form the nozzle adjacent in the axial direction and the reachable region on the surface 10 in the front direction of the water W jetted from the nozzle 12 is set in the prescribed angle θ in the parallel movement direction of the nozzle 12. When the nozzles 12 are moved in parallel to the surface 10 from one side to the other side, laitance scraps and the sand component are pushed by the water W and gathered on the other side. As a result, the cleaning of the surface 10 in the reachable region of the water W jetted from the plural nozzles 12 arranged in a row can be completed by only one operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a concrete surface, and more particularly to an improved technique for cleaning a concrete surface with high-pressure water.

[0002]

2. Description of the Related Art When constructing a concrete structure such as a dam embankment, a concrete surface is transferred over a considerably large area. In this case, the joint surface of the concrete is usually washed and cleaned to remove slag and sand from the surface.

[0003] In such washing and treatment, a high pressure jet of water by a water jet is generally employed because the area to be treated is large. Conventionally, the method of washing and cleaning by water jet has mainly been a method in which an operator grips a hose provided with a nozzle for injecting high-pressure water in a fan shape at a tip end and manually performs the operation.

[0004] When cleaning and cleaning in this manner,
While oscillating the nozzle back and forth and left and right, the slag and sand of the latence were scraped off and collected toward the sand pump or vacuum pump.

However, such conventional cleaning and cleaning methods have the following problems.

[0006]

That is, in a system in which a jet nozzle is ejected manually by gripping the nozzle,
The same area must be cleaned about five or six times so that the residue of the latence and sand do not occur. In addition, even with such a cleaning method, if a residue occurs and there is a residue, Since it has to be rubbed off with a brush or the like, the cleaning work requires time and personnel, resulting in inefficient work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object the object of the present invention is to make it possible to efficiently carry out cleaning work without leaving slag or sand of latence. An object of the present invention is to provide a method for cleaning a concrete surface.

[0008]

In order to achieve the above object, the present invention provides a plurality of nozzles for injecting high-pressure water in a row at predetermined intervals above a surface of a concrete to be cleaned, A method for cleaning a concrete surface, in which the spray areas of the high-pressure water sprayed in a fan shape from the axially adjacent nozzles overlap each other, and the nozzles are moved in parallel from one side of the concrete surface to the other side. The spray range of the high-pressure water from the nozzle to the concrete surface is set within a predetermined angle on the front side with respect to the parallel movement direction of the nozzle.

According to the concrete surface cleaning method thus configured, a plurality of nozzles for injecting high-pressure water are arranged in a line, and a spray area of high-pressure water to be fan-injected from an axially adjacent nozzle is provided. The nozzles are overlapped with each other, and the injection range of the high-pressure water of the nozzle with respect to the concrete surface is set within a predetermined angle on the front side with respect to the parallel movement direction of the nozzle, so that the nozzle is moved from one side of the concrete surface. When translated toward the other side, the slag and sand of the latence are pushed by the high-pressure water and collected on the other side, thereby cleaning the concrete surface in an area corresponding to the nozzles arranged in a row. finish.

[0010] The nozzle may be a nozzle unit in which a plurality of nozzle units are installed at equal angular intervals on a rotatably supported rotating body, and the plurality of nozzle units may be arranged along the axial direction of the support shaft. it can.

According to this configuration, by increasing or decreasing the number of nozzle units, it is possible to easily cope with the size of the concrete surface to be cleaned.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show one embodiment of the concrete surface cleaning method according to the present invention.

The cleaning method shown in FIG. 1 is a method applied when a concrete structure such as a dam embankment is to be constructed and a large area of concrete is to be transferred. A plurality of nozzles 12 for injecting high-pressure water W are provided above the target concrete surface 10 at predetermined intervals.

In the case of this embodiment, the nozzle 12 is
The nozzle unit 16 is integrated with the nozzle unit 4, and a plurality of nozzle units 16, in the case of this embodiment, a total of 6
The nozzle units 16 are arranged in a row above the concrete surface 10.

Each nozzle 12 sprays high-pressure water W spreading in a fan shape or a plane shape having a predetermined angle α. As shown in FIG. Six are radially arranged so as to be directed outward from.

The rotating body 14 is rotatably instructed on the outer periphery of a support shaft 20 in which a supply passage 18 for high-pressure water W is provided. A communication hole 22 communicating with the supply passage 18 is formed inside the support shaft 20, and a surface side of the support shaft 20 is provided with a communication hole 22.
A concave groove 24 connected to the communication hole 22 is curved.

The nozzle unit 16 constructed as described above
According to the above, when the rotating body 14 rotates in the direction of the arrow in FIG.
The high-pressure water W is supplied from the supply passage 18 only to the nozzle 12 located within the angular range where the concave groove 24 is provided.

That is, in FIG. 4, the high-pressure water W is supplied only to the two nozzles 12 communicating with the concave groove 24,
The high-pressure water W is not supplied to the other four nozzles 12.

Therefore, the spray range of the high-pressure water W sprayed from each nozzle unit 16 to the concrete surface 10 in the vertical section is determined by the angle θ of the groove 24 with respect to the center of the support shaft 20.
The high-pressure water W is sprayed on the concrete surface 10 only within this angle range.

The rotation of the rotating body 14 shown in the present embodiment can be performed, for example, by a reaction force at the time of injecting the high-pressure water W, or by using the power of a motor or the like.

As shown in FIG. 1, the spraying range of the high-pressure water W sprayed from each nozzle unit 16 to the concrete surface 10 in the vertical section is perpendicular to the concrete surface 10 extending from the center of the nozzle unit 16. The position B separated by a predetermined angle β forward is the injection start position, and the injection is performed within a range of the angle θ (the length on the concrete surface 10 is L) from this position.

This angle θ is located in front of the moving direction (indicated by a white arrow in FIG. 1) when the nozzle unit 16 is moved in parallel from one side of the concrete surface 10 to the other side. ing.

On the support shaft 20 side of the nozzle units 16 arranged in a line at predetermined intervals, as shown in FIG. 3, high-pressure water sprayed from each nozzle unit 16 in a fan shape at an angle α. The injection regions in the horizontal cross section of W are configured so as to partially overlap each other on the outer peripheral side between those adjacent in the axial direction.

The nozzle unit 1 configured as described above
When cleaning the concrete surface 10 using 6, a plurality of nozzles 12 for injecting the high-pressure water W are installed in a line,
The spray areas of the high-pressure water W sprayed in a fan shape from the axially adjacent nozzles 12 overlap each other, and the spray range of the high-pressure water W of the nozzles 12 on the concrete surface 10 is determined by the parallel movement direction of the nozzles 12. Is set within the range of the predetermined angle θ on the front side, so that the nozzle 1
2 is moved from one side of the concrete surface 10 to the other side, the slag and sand of the latence are pushed by the high-pressure water W and collected on the other side, whereby the nozzles 12 arranged in a row are arranged. Cleaning of the concrete surface 10 in the range corresponding to the number and the spray angle α is completed by one operation.

In this embodiment, the nozzle 12
Is a plurality of nozzle units 16 installed at equal angular intervals on a rotating body 14 rotatably supported by a support shaft 20, and a plurality of nozzle units 16 are arranged on the support shaft 20 along the axial direction. Therefore, the size of the concrete surface 10 to be cleaned can be easily adjusted by increasing or decreasing the nozzle unit 16.

The configuration in which the nozzle 12 injects the high-pressure water W at the angle θ to the concrete surface 10 is not limited to the configuration using the rotating body 14 shown in the above embodiment. A configuration in which the support shaft is fixedly arranged along the axial direction of the support shaft, the support shaft is swung within a range of a predetermined angle θ, and high-pressure water is sprayed onto the concrete surface within a range of the angle θ.

[0027]

As described above in detail, according to the concrete surface cleaning method of the present invention, there is no residue of latence residue and sand, and the cleaning operation can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a side view of a cleaning operation state showing an embodiment of a concrete surface cleaning method according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is an enlarged sectional view of the nozzle unit shown in FIG.

[Explanation of symbols]

 10 Concrete surface 12 Nozzle 14 Rotating body 16 Support shaft

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoichi Sato 2-15-2 Konan, Minato-ku, Tokyo Obayashi Corporation Headquarters F-term (reference) 3B201 AA31 AB51 BB22 BB32 BB34 BB43 BB45 BB55 BB92

Claims (2)

[Claims] 1. A plurality of nozzles for injecting high-pressure water are arranged in a row above a surface of a concrete to be cleaned at predetermined intervals, and the high-pressure water is injected in a fan shape from the nozzles adjacent in the axial direction. A method of cleaning a concrete surface, wherein the spray areas of the nozzles overlap each other, and the nozzle is moved in parallel from one side of the concrete surface to the other side, wherein the high-pressure water spray range of the nozzle on the concrete surface Is set within a predetermined angle on the front side with respect to the parallel movement direction of the nozzle. 2. A plurality of nozzle units are provided at equal angular intervals on a rotating body rotatably supported by a support shaft, and the plurality of nozzle units are arranged along the axial direction of the support shaft. 2. An arrangement according to claim 1, wherein
A method for cleaning a concrete surface as described.