JPH01190891A - Chipping method for reinforced concrete structure - Google Patents

Abstract

PURPOSE:To perform chipping without damaging a reinforcing bar, by a method wherein concrete is chipped through injection of ultrahigh pressure water through a plurality of nozzles as a nozzle head having a plurality of the nozzles is rotated. CONSTITUTION:A plurality of nozzles 3 arranged at intervals in the circumferential direction of the center of a rotary shaft 1 are mounted to a nozzle head 2 coupled to a hollow rotary shaft 1 for feeding ultrahigh pressure water. The nozzle head 2 is rotated through injection of ultrahigh pressure water toward an impeller 44 through an ultrahigh pressure water feed pipe 45 for rotation. Simultaneously, ultrahigh pressure water is injected through the nozzles 3, and concrete of a reinforced concrete structure is chipped by means of the ultrahigh pressure water.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for hoisting a concrete portion of a reinforced concrete structure by jetting ultra-high pressure water.

[Prior art]

Conventionally, methods for removing concrete in reinforced concrete structures include (11) using an impact-type chisel powered by compressed air, and (2) inserting a chisel into a groove cut into a reinforced concrete structure. (3) A method in which hard metal balls such as steel balls or cast iron balls are made to collide with the concrete surface using a jet of compressed air or an impeller rotated by a motor. There are known methods of hanging.

[Problem that the invention seeks to solve]

However, in the case of the above-mentioned fi+ chiseling method, the concrete is removed by the striking force of the bit of an impact-type chisel operated by compressed air, so parts other than the intended chiseling part are often torn off by the striking force. .

Furthermore, if the bit hits the rebar, the rebar may be damaged or bent, making it impossible to reuse it. Also, when concrete is chipped by the impact force of the bit, a large amount of dust is generated, so ventilation equipment is required, and if the concrete is hit with the bit over the chipping debris, the chipping ability will be reduced, so remove the chipping debris. Therefore, the lifting work is complicated. Furthermore, since the impact-type chisel tool cannot remove rust from the reinforcing bars, a secondary step of removing rust from the reinforcing bars is required after chiseling is completed.

In the case of chiseling method (2) above, it is not possible to chisel uniformly, and cracks often occur in concrete parts other than the part planned for chiseling, and furthermore, it is difficult to insert the chisel into the concrete using a concrete cutter, drill, etc. When creating trenches, concrete cutters and drills may hit the reinforcing bars and damage them. Also, if the depth of the wedge is shallow, there is almost no wedge effect, so it will not be possible to chisel, and it will not be possible to remove the rust from the reinforcing bars just by driving in the pattern, so the rust will be removed from the reinforcing bars after the chiseling is completed. A secondary process is required.

In the case of chiseling method (3) above, if the surface layer of aged concrete is chiseled, the surface layer has become weak, so if a hard metal ball collides with it, the hard metal ball will break into the concrete. Since the hard metal balls penetrate into the surface layer of the ball and cannot hang any further, it is necessary to remove the hard metal balls that have entered and then collide them with the hard metal balls again, which is a complicated process. In addition, when a hard metal ball collides with a concrete surface, dust is generated, which needs to be collected, and the hard metal balls that have been collided also need to be collected, which increases the size of the equipment. There is.

[Purpose and structure of the invention]

The purpose of this invention is to provide a method for chiseling a reinforced concrete structure that can advantageously solve the above-mentioned problems. The nozzle head 2 is provided with a plurality of nozzles 3 arranged at intervals around the center of the rotation axis 1, and ultra-high pressure water is injected from each nozzle 3 while the nozzle head 2 is rotated. , a method for chiseling a reinforced concrete structure, characterized in that concrete of the reinforced concrete structure is chiseled using the ultra-high pressure water.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

Figures 1 to 4 show an example of a lifting device used when carrying out the present invention, and are attached to both the left and right sides of a self-propelled trolley 5 running inside a concrete structure 4 consisting of a reinforced concrete tunnel. , an outrigger 6 consisting of a hydraulic cylinder is fixed, a battery 7 is mounted on the bogie 5, and a guide rail 8 extending in the front-rear direction (vehicle running direction) is fixed at the upper center of the bogie 5. A back-and-forth movement drive device 10 consisting of an electric motor with a speed reducer is fixed to a sliding support 9 that is slidably fitted into a sliding support 9 , and a drive gear 11 is fixed to the output shaft of the back-and-forth movement drive device 10 . is rack 1 fixed to guide rail 8
2, and when the longitudinal movement drive device 10 is rotated forward or backward, the sliding support base 9 is moved forward or backward.

The lower end of a vertical guide column 13 is fixed to the upper center of the sliding support base 9, and an elevating support member 14 is fitted to the guide column 13 so as to be movable up and down but not rotatable. A rack 15 perpendicular to the outer surface is fixed, and a lifting drive unit 17 consisting of a motor with a reduction gear is fixed to a support stand 16 fixed to the sliding support stand 9, and is fixed to the output shaft of the lifting drive unit W17. The driven gear 18 is meshed with the rack 15, and the driving gear 18 is engaged with the rack 15.
When rotated forward or backward, the elevating support member 14 is moved upward or downward.

Support member 1 fixed to the upper end of the lifting support member 14
9, the annular gear 20 is fixed, and the rotation support base 21
is rotatably fitted, a swing drive device 22 consisting of an electric motor with a speed reducer is fixed to the swing support base 21, and a drive gear 23 fixed to the output shaft of the swing drive device 22 is connected to the ring-shaped When the gear 20 is engaged with the rotating drive device 22, the rotating support base 21 is rotated.

A base end portion of a first arm 25 that is rotated up and down by a first up/down drive device 24 is rotatably attached to the pivoting support base 21 by a horizontal axis, and a second A second arm 27 that is tilted and rotated by the tilt drive device 26
The base end of the third arm 29 is rotatably attached to the distal end of the second arm 27, and the base end of a third arm 29 rotated by the drive device 28 is rotatably attached to the distal end of the second arm 27. and the first arm 25. The second arm 27 and the third arm 29 constitute a refracting arm 3o.

A box-shaped case 31 with an open front end and a center line extending in a direction perpendicular to the longitudinal direction of the third arm 29 is fixed to the tip of the third arm 29, and the case 31
The center line of is located on a plane perpendicular to the horizontal axis of the base end of the third arm 29, and the ultra-high pressure water supply hollow rotary shaft 1, which is arranged on the center line of the case 31, has a bearing 32 supported by the case 31. A case 3 is supported at the rear of the hollow rotary shaft 1 so that it can rotate freely and not move in the axial direction.
An ultra-high pressure water supply pipe 33 arranged along the center line of the case 31 is fixed to the end plate of the case 31, is connected to the hollow rotating shaft 1 via a swivel joint 34, and is connected to the cart 5. The mounted ultra-high pressure water supply pump W (not shown) and the ultra-high pressure water supply pipe 33 are connected to the hose 35.
and are connected via a joint 36.

Branch arms 38 are connected to the front end of the central shaft 37 and protrude from the central shaft 37 on both sides in the diametrical direction, and the distal ends of each branch arm 38 are inclined in a direction that approaches each other toward the front. Further, the central shaft 371, the branch arm 3B, and the protrusion 39 are provided with an ultra-high pressure water supply hole 40 extending over the center thereof, thereby forming the nozzle head 2, and each of the protrusions 39 A nozzle 3 is screwed and fixed to the shaft, and a rear end of a central shaft 37 is screwed and connected to the front end of the hollow rotary shaft 1 for supplying ultra-high pressure water. placed at equal distances.

A drive shaft 41 parallel to the ultra-high pressure water supply hollow rotary shaft 1 is rotatably supported by a bearing fixed to the case 31, and a drive gear 42 fixed to the drive shaft 41 is connected to the hollow rotary shaft 1. It is meshed with a driven gear 43 fixed to the rotating shaft 1 , an impeller 44 is fixed to the driving shaft 41 , and one end of the rotating ultra-high pressure water supply pipe 45 is connected to the side of the ultra-high pressure water supply pipe 33 . The nozzle connected and fixed to the other end of the ultra-high pressure water supply pipe 45 faces the impeller 44, and when the ultra-high pressure water supply pump device is operated, 5
Ultra-high pressure water of 00 to 2000 kgf/cJ is supplied to each nozzle 3.
The ultra-high pressure water is injected diagonally forward from the rotary ultra-high pressure water supply pipe 45 towards the impeller 44 and the impeller 44 is rotated.
4, the nozzle head 2 is rotated via the driving gear 42°, the driven gear 43, and the hollow rotating shaft 1 for supplying ultra-high pressure water.

Said first elevation drive device M24. As the second elevation drive device 26 and the drive device 28, a worm and a worm gear driven by, for example, a row actuator or an electric motor are used. Further, the electric traveling device of the trolley 5, the drive device 10 for moving back and forth, the drive bag Fi 17 for lifting and lowering, and the drive device 22 for turning are connected to the battery 7.

When using the chisel constructed as described above to chisel the inside of a concrete structure 4 consisting of a reinforced concrete tunnel, after stopping the cart 5 at an appropriate position, the outrigger 6 is crimped to the lower board. Then, the longitudinal position of the sliding support base 9, the vertical position of the lifting support member 14,
The pivoting position of the pivoting support base 21 is appropriately adjusted, and the bending arm 3° is suitably bent and extended so that the nozzle head 2 faces the part of the concrete structure 4 to be chiseled, and then each nozzle 3 in the nozzle head 2 is chiseled into the concrete structure. While spraying ultra-high pressure water diagonally towards object 4,
Rotate the nozzle head 2.

In this way, as shown in FIG. 5, the concrete 4 in the concrete structure 4 is
The 6's are strung together in a 7-shape as shown by the broken line 47, and the rust on the reinforcing bars 48 left in the 7-shape portion is removed by jetting ultra-high pressure water.

FIG. 6 shows another example of the nozzle head 2 having a plurality of nozzles 3, in which a protrusion 39 is connected at right angles to the tip of each branch arm 38. When the nozzle head 2 shown in FIG. 6 is used, concrete 46 can be uniformly poured as shown by the broken line 47 in FIG.

〔Effect of the invention〕

According to this invention, the plurality of nozzles 3 that spray ultra-high pressure water
is rotated around the hollow rotary shaft 1 for supplying ultra-high-pressure water, so the area during which the ultra-high-pressure water is jetted can be widened to widen the chisling work area per unit time, which improves the chisel work efficiency. Since it is possible to perform chiseling by jetting ultra-high pressure water, chiseling can be performed without damaging or bending the reinforcing bars, and rust can be easily removed from the reinforcing bars. Even if this is done, no dust is scattered and no vibration is generated, so there is no need to use dust collection equipment, and the work environment can be maintained in a good condition. By changing the discharge pressure from the nozzle 3, etc., effects such as being able to easily adjust the amount of refill can be obtained.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a front view showing a state in which a lifting device is placed inside a tunnel, and Figure 2 is a partially enlarged view. 3 is a vertical cross-sectional side view showing a nozzle rotation device in the chisel device, FIG. 4 is a cross-sectional plan view showing the lifting and lowering moving device for the lifting support member, and FIG. 5 shows concrete being lifted by the rotating nozzle. FIG. FIG. 6 is a longitudinal side view showing another example of a nozzle head having a plurality of nozzles;
FIG. 7 is a sectional view showing concrete being suspended by a nozzle head having the nozzle shown in FIG. In the figure, 1 is a hollow rotating shaft for supplying ultra-high pressure water, 2 is a nozzle head, 3 is a nozzle, 4 is a concrete structure, 5 is a trolley, 6 is an outrigger, 38 is a guide rail, 9 is a sliding support base, 10 is a drive device for forward and backward movement, 11 is a drive gear,
12 is a rack, 13 is a guide column, 14 is an elevating support member, 15 is a rack, 17 is an elevating drive device, 18 is a drive gear, 20 is an annular gear, 21 is a swing support base, 22 is a swing drive device, 23 is a drive gear, 24 is a first elevation drive device,
25 is a first arm, 26 is a second elevation drive device, 27 is a second arm, 28 is a drive device, 29 is a third arm, 30 is a bending arm, 31 is a case, 33 is an ultra-high pressure water supply pipe, 3
4 is a swivel joint, 40 is an ultra-high pressure water supply hole, 41
is a drive shaft, 42 is a drive gear, 43 is a driven gear, 44 is an impeller, 45 is an ultra-high pressure water supply pipe for rotation, and 46 is concrete. C three days

Claims (1)

[Claims] A nozzle head 2 connected to a hollow rotating shaft 1 for supplying ultra-high pressure water is provided with a plurality of nozzles 3 arranged at intervals around the center of the rotating shaft 1, and while rotating the nozzle head 2, A method for chiseling a reinforced concrete structure, characterized in that ultrahigh pressure water is injected from each nozzle 3, and concrete of the reinforced concrete structure is peeled off using the ultrahigh pressure water.