JP2002242124A - Method for chipping concrete by water jet, and method and device for treating waste water generated during chipping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which reduces the total amount of used water by recycling waste water generated in construction work for chipping concrete of a concrete structure by a jet of high pressure water emitted from a nozzle, delays the progress of deterioration of the concrete neutralized by using the waste water having a great pH, and enhances the quality of the concrete structure repaired by eliminating rust of a reinforcing bar exposed during chipping. SOLUTION: This device is composed of a chipping robot 1 which performs chipping work by means of a water jet, a high pressure water generator 2 which supplies the high pressure water to the chipping robot 1, a water tank truck 3 which supplies fresh water to the generator 2, a vacuum truck 4 which sucks in the waste water generated during the chipping by means of the water jet, and a solid-liquid separator 5 which makes the solid-liquid separation of the recovered waste water and includes a pump for supplying treated water to the generator 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to high-pressure water (hereinafter, referred to as high-pressure water) for injecting concrete of a concrete structure from a nozzle.
"Water jet"),
The present invention relates to a method and an apparatus for treating wastewater generated when picking.

[0002]

2. Description of the Related Art Concrete hanging work is one of the works for repairing deteriorated concrete. In other words, in this construction, the concrete work which has been deteriorated is firstly carried out at the time of rehabilitation, and a hand breaker or a shot blast has conventionally been used for this work. However, the lifting work with a hand breaker requires a considerable amount of work, and tends to damage steel bars and sound concrete when hanging.In addition, the lifting work by shot blast requires a large-scale device, and it takes time to clear up. Moreover, it is more dangerous than anything else.

[0003] In recent years, a method using a water jet has been developed as a work for hanging degraded concrete, and it has begun to be used. According to this method, only the deteriorated concrete can be removed, and since it is a non-vibration construction, there is no occurrence of secondary damage, rusted rebar can be cleaned, and after the deteriorated concrete is removed, Since the sound concrete surface has an irregular uneven surface, there is an excellent effect such that the adhesiveness of newly poured concrete can be enhanced.

[0004]

SUMMARY OF THE INVENTION A first object of the present invention is to improve the concrete structure after the suspension in a method for removing concrete by a water jet.

[0005] The water jet method also includes
There were the following problems. Where a large amount of water is used, the cost is high.In places where it is difficult to secure water depending on the construction site, a water truck must be prepared and returned to the site many times. They are suction-repaired with a vacuum car, transported to a treatment plant to separate and remove solids from wastewater, and then adjusted for pH (since the wastewater from which strong alkaline concrete has been washed out has a high PH), it is discharged. In addition, processes such as removal of solids and pH adjustment are required, and a wastewater truck for transporting wastewater is also required.

[0006] A second object of the present invention is to solve the above-mentioned problem by recycling wastewater generated in a hanging operation by a water jet.

[0007]

The invention according to claim 1 is characterized in that in a method of sprinkling concrete of a concrete structure by a water jet, high-pressure water having a high PH is jetted to sprinkle the concrete. By using high-pressure water having a high PH, deterioration of the neutralized concrete can be delayed, and oxidation of the reinforcing steel bar exposed at the time of hanging can be prevented.

[0008] The invention according to claim 2 is a method for treating wastewater generated when water of concrete in a concrete structure is suspended by a water jet, wherein solids are removed from wastewater collected from a construction site and then recycled as a water jet. It is characterized by doing.

According to the present invention, the total amount of water used is reduced by recycling, the number of reciprocations of the water truck can be reduced even in places where there is no water supply facility, and the pH of the recycled water is high. Need not be increased.

[0010] The invention according to claim 3 relates to an apparatus for carrying out the invention according to claim 2, and comprises a suspension device for carrying out a concrete work for hanging concrete on a concrete structure by a water jet, and supplying high-pressure water to the suspension device. High-pressure water generating device, fresh water supply means for supplying fresh water to the high-pressure water generating device, a vacuum device for sucking and collecting waste water generated when concrete is attached by a water jet, and a waste water sucked and collected by the vacuum device And a means for sending treated water from which solids have been separated and removed by the solid-liquid separator to the high-pressure water generator.

The lifting device used in the present invention includes:
There is no particular limitation as long as it can perform a hanging operation using a water jet, and examples thereof include, but are not limited to, robots 322 and 363 (product names) and jet frames 102 and 122 (product names) manufactured by Conjet Corporation. No.

As the high-pressure water generating device, a known device for generating high-pressure water can be used. Examples of the fresh water supply means include a water supply facility such as a water supply, a water supply vehicle, and the like. The vacuum device is not particularly limited as long as it can suck and collect wastewater. One such example is a vacuum car. As the solid-liquid separation device, a known device for separating and removing a solid content can be used. As a means for sending the treated water to the high-pressure water generator, for example, a pump can be used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a flow of water used for hanging by a water jet, and has a nozzle for injecting high-pressure water and is a hanging robot as a hanging device for hanging concrete of a concrete structure. 1
A high-pressure water generator 2 for supplying high-pressure water to the hanging robot 1, a water supply truck 3 as fresh water supply means for supplying fresh water to the high-pressure water generator 2, Vacuum car 4 as a vacuum device for sucking waste water generated at the time of hanging by a jet, removing large-sized solids by sieving, and collecting the solids.
A solid-liquid separator 5 for performing solid-liquid separation of the turbid water supplied from the vacuum car 4 to remove solids, for example, a sludge dewatering vehicle (trade name “Dodas”) manufactured by Kotobuki Giken Kogyo Co., Ltd. A pump (not shown) as means for supplying treated water to the high-pressure water generator 2 is provided in the solid-liquid separator 5.

According to the present apparatus, waste water generated during hanging by a water jet is suctioned and collected by a vacuum car 4, solids are separated and removed by a solid-liquid separator 5, and then sent to a high-pressure water generator 2 for recycling. .

[0015]

According to the first aspect of the present invention, when used for concrete suspension work, the progress of deterioration of the neutralized concrete can be delayed. This has the effect of preventing oxidation and rusting before new concrete is cast.

According to the second and third aspects of the present invention, since the water used is recycled, the total amount of water used can be reduced, and the number of reciprocation of the water truck when used in a place without water supply equipment is also reduced. It is possible to reduce costs, and because recycled water has a high PH, P
The same effect as the above-described invention according to claim 1 can be obtained without performing a process for increasing H, and the above-mentioned effects such as improvement in construction quality in repair work of a concrete structure can be achieved. To play.

[Brief description of the drawings]

FIG. 1 is a diagram showing a flow of water used for hanging by a water jet.

[Explanation of symbols]

 1 ... Hanging robot 2 ... High pressure water generator 3 ... Water truck 4 ... Vacuum car 5 ... Solid-liquid separation device

Claims (3)

[Claims] 1. A method for removing concrete from a concrete structure by means of a water jet, wherein the concrete is removed by injecting high-pressure water having a high PH. 2. A method for treating wastewater generated when a concrete of a concrete structure is suspended by a water jet, wherein solids are removed from wastewater collected from a construction site and then recycled as a water jet. Concrete by water jet is a method of treating wastewater generated during hanging. 3. A lifting device for performing a lifting operation of concrete of a concrete structure by a water jet.
A high-pressure water generator that supplies high-pressure water to the lifting device, a fresh water supply unit that supplies fresh water to the high-pressure water generator, and a vacuum device that suctions and collects wastewater generated when concrete is attached with a water jet, A solid-liquid separator for separating and removing solids from the wastewater sucked and collected by the vacuum device; and a means for sending treated water from which solids are separated and removed by the solid-liquid separator to the high-pressure water generator. An apparatus for performing the wastewater treatment method according to claim 2.