JPH0681468A - Green cut working method - Google Patents

Abstract

PURPOSE:To perform recovery of laitance with high efficiency by a method wherein, in the approximately closed space of a housing, ultra high pressure water is obliquely injected against a concrete surface through an injection nozzle, and the scraped off laitance is sucked for recovery. CONSTITUTION:In a state that a truck 503 is run by means of an unmanned conveyance vehicle 501, ultra high pressure water is injected within a housing 505 through an injection nozzle 511 against a concrete surface C to scrape off laitance. The scraped off laitance is then sucked through a suction port 513 togetherwith sludge by means of the force of sludge bouncing as a result of ultra high pressure water being injected against the concrete surface C and by vacuum operation of a vacuum pump 703, the laitance being fed to the vacuum pump 703 side through vacuum hoses 515 and 701. The laitance and debris are removed within a recovery tank 705, and the sludge is caused to flow to a drainage pit through a drainage hose 707A with the aid of a drainage pump 707. At a stage followed by the drainage pump 707, only air is sucked through the vacuum hose 701 to the pump 703.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a green-cut working method, and more particularly to a green-cut working method capable of efficiently collecting leitance and polluted water scraped off by ultra-high pressure water.

[0002]

2. Description of the Related Art In constructing a dam, the seam processing work for removing the leitance of the concrete surface, that is, the green cutting work is conventionally performed by rotating a brush and scraping off the concrete surface with this brush. Since the work of mechanical shaving is done, there is a limit to the work efficiency. Therefore, hold the ultra-high pressure water injection nozzle by hand, eject the ultra-high pressure water from the ultra-high pressure water injection nozzle to scrape off the concrete surface, or install the ultra-high pressure water injection nozzle in the vehicle to run the vehicle while running the green. It is conceivable to perform cutting work.

When performing a green cutting operation using ultra-high pressure water as described above, it is considered necessary to scrape the leitance, collect the scraped leitance, and collect polluted water. If the work is performed separately, the work time is long and the work efficiency cannot be improved. Furthermore, the work to scrape off the leitance,
If the collecting operation is performed separately, it is necessary to inject high-pressure water again when collecting the leitance, and a large amount of water is wasted.

Therefore, the present applicant has filed Japanese Patent Application No. 3-2806.
In No. 55 and Japanese Patent Application No. 3-298158, in the vicinity of the concrete surface where the super-high-pressure water is sprayed, the leitance scraped off with the super-high-pressure water is sucked and collected together with the contaminated water to improve work efficiency. I have proposed the green cut work method.

[0005]

On the other hand, as shown in FIG. 12, when ultra-high pressure water is jetted perpendicularly to the concrete surface C, the scraped latance and polluted water scatter around and around. Since the direction is not specified,
There is a problem in that the scraped-out leitance and polluted water cannot be efficiently collected. Further, when the ultra-high pressure water is jetted from the direction orthogonal to the concrete surface, as shown in FIG. 13, all the kinetic energy of the ultra-high pressure water acts in the direction of vertically excavating the concrete surface C, so that the leitance is reduced. Although scraped off, fine unevenness tends to occur on the concrete surface C1 from which the latance has been scraped off, and it is difficult to ensure flatness.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to efficiently remove scraped leitance and polluted water when jetting ultra high pressure water onto a concrete surface to scrape off the leitance. An object of the present invention is to provide a green cutting work method that can be well recovered and is advantageous in securing the flatness of the concrete surface from which the leitance has been scraped off.

[0007]

In order to achieve the above object, the present invention is a green-cut working method in which ultrahigh pressure water is sprayed onto a concrete surface to scrape off the laitance, and the ultrahigh pressure water is obliquely applied to the concrete surface. As well as spraying
In the direction in which the ultra-high pressure water bounces off the concrete surface, the scraped latance is sucked and collected together with the polluted water. Further, the present invention is characterized in that the injection of the ultra-high pressure water and the suction and recovery of the scraped leitance and the polluted water are performed in a substantially closed space on the concrete surface.

[0008]

EXAMPLES Examples in which the present invention is applied to a green cutting device will be described below. FIG. 1 is an explanatory diagram of the green cutting device, and FIG. 2 is a schematic configuration diagram thereof. The green cut device 1 includes an ultra high pressure water supply unit 3 and a work vehicle unit 5.
And a mud collection unit 7 are included.

The ultra-high pressure water supply unit 3 includes an engine 30.
1, a water supply pump 303, an ultrahigh pressure water pump 305, a filtration device 307, a water supply tank 309, and the like. Water pump 3
03 and the ultra high pressure water pump 305 are driven by the engine 301, and the construction water is filtered by the water supply pump 303.
07 is supplied to the water supply tank 309, and the water in the water supply tank 309 is sent out by the ultra high pressure water pump 305 via the ultra high pressure water hose 311. The ultra-high pressure water supply unit 3 having such a configuration can be mounted on the automatic guided vehicle 313 for the ultra-high pressure water supply unit, as shown in FIG.

The work vehicle unit 5 is movably supported by an automated guided vehicle 501, and is arranged on a bank 9 on which green cutting work is performed. The work vehicle unit 5 includes a carriage 503 connected to a front portion of an automated guided vehicle 501, and the carriage 503 supports a housing 505 having an open lower portion.

FIG. 3 is a side view of the housing, and FIG. 4 is a partially cutaway plan view of the housing. On the side surface of the housing 505, a super abrasion resistant rubber plate 507 that contacts the concrete surface C is attached. The super abrasion resistant rubber plate 507 forms a closed space S that is substantially sealed in the housing 505. An injection nozzle 511 connected to an ultra-high pressure water hose 509 is provided in the housing 505, and the vacuum hose 5 is provided on the upper surface of the housing 505.
A suction port 513 to which 15 is connected is provided.

As shown in a schematic side view of FIG. 5, a side view of FIG. 6, and a bottom view of FIG. 7, the injection nozzle 511 has a nozzle body 511A and a large number of ejection nozzles formed on the nozzle body 511A. The holes 511B (48 in the embodiment) are provided, and the ultra high pressure water from the ultra high pressure water hose 509 is ejected through the passage 511C in the nozzle body 511A.
Erupted from 1B.

As shown in the enlarged view of the ejection hole portion in FIG. 8, the nozzle body 511A has a bottom surface 5101 parallel to the concrete surface C which is a work surface, and a plurality of recesses 5103 are formed in this bottom surface 5101. . Then, a hole 5107 orthogonal to the slope 5105 is formed in a slope 5105 that constitutes the recess 5103 and intersects the bottom face 5101 obliquely, and a nozzle tip 5113 is formed in the hole 5107 via an O-ring 5109 and a set bolt 5111. It is embedded and fixed, and the opening 5115 of the ejection hole 511B is located on the slope 5105.

The openings 5115 of the large number of injection holes 511B.
Are provided at the same height from the concrete surface C, and
The axes of the multiple injection holes 511B are provided in parallel with each other at an angle θ with respect to the concrete surface C, and in the embodiment, the angle θ with respect to the axis of the ejection holes 511B with respect to the concrete surface C is the traveling direction of the vehicle. The direction F side is set to have an obtuse angle. The suction port 513 is provided at the housing 505 in the direction in which the ultra-high pressure water jetted obliquely from the jet nozzle 511 rebounds on the concrete surface C.

In this embodiment, at the time of green cutting, the jet nozzle 511 reciprocates with the carriage 503 to the left and right of the automatic guided vehicle 501, and the jet nozzle 511 has a trace of ultrahigh pressure water having a predetermined width. To be the surface of
The whole is configured to move on a circular locus (it does not rotate on its own). Further, the injection nozzle 511 is supported by a vertical movement mechanism so that its height can be changed, and is disposed so as to be movable from inside the housing 505 to above the outside of the housing 505 through an opening on the upper surface of the housing 505. A bellows is provided between the upper portion or the upper end portion thereof and the opening, and the injection nozzle 51
It is configured so that the closed space S is maintained in a substantially closed state when the vertical movement of 1 is performed.

The ultra-high pressure water hose 311 and the ultra-high pressure water hose 509 are connected to each other via a winding and unwinding mechanism 517 mounted on the automatic guided vehicle 501, and the vacuum hose 515 is mounted on the automatic guided vehicle 501. The vacuum hose 515 is supported by the winding and unwinding mechanism 519 so as to be able to be wound and unwound, and this vacuum hose 515 is connected to the vacuum hose 701 on the mud collecting unit 7 side through the winding and unwinding mechanism 519.

As shown in FIGS. 1 and 2, the mud collecting unit 7 includes a vacuum pump 703 and a vacuum pump for sucking the leitance scraped off by the ultra-high pressure water together with the polluted water through the vacuum hoses 515 and 701. An engine 704 for driving the pump 703, a latance recovery tank 705 provided in the vacuum hose 701 portion in front of the vacuum pump 703, and a vacuum hose 701 portion provided between the vacuum pump 703 and the recovery tank 705. A drainage pump 707 and the like are provided, and the mud collection unit 7 is arranged at a location apart from the bank body 9.

Next, the operation will be described. While the carriage 503 is driven by the automatic guided vehicle 501, the housing 50
In 5, the ultra high pressure water is jetted from the jet nozzle 511 to the concrete surface C, and the laitance is scraped off. The high-pressure water in the scraped leitance is concrete surface C
Due to the momentum of the polluted water that is jetted to and bounces off the water and the vacuum action of the vacuum pump 703, the vacuum hose 515 and 701 are sucked together with the polluted water from the suction port 513.
It is fed to the vacuum pump 703 side via. Then, in the recovery tank 705, the leitance and the shear are removed, and the polluted water from which the leitance and the shear are removed is discharged from the drainage pump 707 and the drainage hose 707A into the drainage pit of the muddy water, and only the air is discharged after the drainage pump 707. It is sucked from the vacuum hose 701 to the vacuum pump 703.

In the above, when the super high pressure water is jetted, the super high pressure water is jetted obliquely to the concrete surface C,
The direction in which the ultra-high pressure water bounces on the concrete surface C is specified, and the leitance and the polluted water scraped off from the suction port 513 are sucked at the bounced portion, so that the leitance and the polluted water can be efficiently collected. In this embodiment, the injection of these ultra-high pressure water and the suction of the leitance and the polluted water are performed in the closed space S that is almost sealed by the housing 505, so that the efficiency of the leitance and the polluted water can be further enhanced. it can.

Further, since the ultra-high pressure water is jetted obliquely to the concrete surface C, the kinetic energy of the ultra-high pressure water acts so as to peel off the leitance of the concrete surface C as shown in FIG. Fine irregularities are unlikely to occur on the concrete surface C1 that has been scraped off, and its flatness can be ensured.

Further, although the super-high pressure water is obliquely jetted from the large number of jetting holes 511B, the jetting holes 511B are parallel to each other and the openings 5115 of the jetting holes 511B are provided at the same height. Therefore, the distances from the openings 5115 along the axis of each injection hole 511B to the concrete surface C are all equal, and therefore, there is no unevenness in the green cutting work, which is advantageous in securing the flatness.

Further, since all of the kinetic energy of the ultra-high pressure water acts as a force for peeling off the leitance, as compared with the case where all of the kinetic energy of the ultra-high pressure water is directed vertically and acts as excavating force, the scraping of the leitance The work efficiency is high, and therefore the traveling speed of the automatic guided vehicle 501 can be increased, and the efficiency of the green cutting work can be improved.

Further, in the embodiment, since the super-high pressure water is jetted to the concrete surface C at an angle θ at which the traveling direction F side of the work vehicle becomes an obtuse angle, the concrete surface C can be seen from diagonally rearward to frontward. The kinetic energy of the ultra-high pressure water acts so as to remove the leitance, and the efficiency of the green cutting work can be further enhanced.

In FIGS. 3 and 4, reference numeral 21 denotes a low-pressure water jet nozzle for collecting dust, which is used after the green cutting work is performed.
Alternatively, it is used for cleaning the concrete surface C immediately before placing concrete. When cleaning the concrete surface C with this low-pressure water jet nozzle 21, FIG.
11, the injection nozzle 511 is retracted above the housing 505, and the shaft 2 is inserted into the groove 23 formed on the side surface of the housing 505, as shown in a partially cutaway plan view of FIG.
5, the brush 27, which is supported by the shaft 25 and has a cylindrical outline, is placed in the housing 505. Further, a motor 31 is arranged in front of the housing 505 via a bracket 29, and an output shaft 33 of this motor 31 and the shaft 25 are connected via pulleys 35, 37 and a belt 39.

The shaft 25 and the brush 27 are arranged so that the suction port 513 is located in a direction in which the brush 27 sweeps out the leitance and the shear. The low-pressure water jet nozzle 21 has a rear end on the upper surface of the housing 505,
Three of the brushes 27 are provided in the front and obliquely downward so as to face the part contacting the concrete surface C or a part rearward thereof, and as shown in FIG. Low-pressure water is sprayed in a fan shape through the opening 505A of the housing 505.

When the concrete surface C is cleaned by the low-pressure water jet nozzle 21, low-pressure water is jetted from the low-pressure water jet nozzle 21, and the brush 27 is swept by the motor 31 in the direction of slanting forward the laitance and shear of the concrete surface C. Rotate. As a result, in the substantially sealed space S in the housing 505, due to the rebounding force of the injected low pressure water on the concrete surface C, the sweeping force by the rotation of the brush 27, and the vacuum action at the suction port 513,
Laitance and shear on the concrete surface C are sucked from the suction port 513 and collected.

Therefore, in this embodiment, the housing 50 is used for the green cutting work and the concrete surface cleaning work.
5 is shared, and both work can be performed by one work vehicle unit 5 by detaching the brush 27 and the motor 31 from the housing 505.

[0028]

As is apparent from the above description, according to the present invention, there is provided a green cutting work method in which ultrahigh pressure water is sprayed onto a concrete surface to scrape off the laitance, and the ultrahigh pressure water is obliquely applied to the concrete surface. In addition, the scraped leitance was sucked and collected along with the polluted water in the direction in which the ultra-high pressure water bounces off the concrete surface. This is advantageous in efficiently collecting the collected leitance and polluted water and ensuring the flatness of the concrete surface from which the leitance has been scraped off.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a green cutting device.

FIG. 2 is a schematic configuration diagram of a green cutting device.

FIG. 3 is a side view of the housing.

FIG. 4 is a partially cutaway plan view of the housing.

FIG. 5 is a schematic side view of an injection nozzle.

FIG. 6 is a side view of an injection nozzle.

FIG. 7 is a bottom view of the injection nozzle.

FIG. 8 is an enlarged view of a jet hole portion.

FIG. 9 is a relationship diagram between ultra high pressure water and a concrete surface.

FIG. 10 is a side view of the housing.

FIG. 11 is a partially cutaway plan view of the housing.

FIG. 12 is a relationship diagram between ultra high pressure water and a concrete surface.

FIG. 13 is a relationship diagram between ultra high pressure water and a concrete surface.

[Explanation of symbols]

 1 Green Cut Device 3 Ultra High Pressure Water Supply Unit 5 Work Vehicle Unit 7 Mud Collection Unit 505 Housing 511 Injection Nozzle 513 Suction Port

Claims (2)

[Claims] 1. A green-cut work method in which ultra-high pressure water is jetted onto a concrete surface to scrape off the laitance, wherein the ultra-high pressure water is jetted obliquely to the concrete surface, and the direction in which the ultra-high pressure water bounces off the concrete surface. The green cut work method is characterized in that the scraped scraped leitance is sucked and collected together with the polluted water. 2. The green cutting work method according to claim 1, wherein the jetting of the ultra-high pressure water and the suction and collection of the scraped latance and the polluted water are performed in a substantially closed space on the concrete surface.