JP2003025293A - Water jet injection nozzle device, and chipping method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem in chipping work using a lance device 2 having a water jet injection nozzle 1 wherein a procedure of previously drilling concrete around the side of a reinforcing bar up to a degree of inserting the water jet injection nozzle and then crashing and removing the concrete under the reinforcing bar is required when existence of the reinforcing bar is determined in a damage part during the chipping work, and thus concrete in an originally sound part around the reinforcing bar must be also removed for chipping part under the reinforcing bar. SOLUTION: This water jet injection nozzle device 10 has a plurality of water jet injection nozzles 14 mounted to a lance body 16 for providing water jet 13 for performing the chipping work. The water jets 13 and 34 injected from respective nozzles 14 converge to one point 0, 01, 02.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, when repairing a damaged portion of a tunnel, road surface, bridge pier, or other reinforced concrete structure, reinforces the damaged portion by filling with new concrete material. Therefore, the present invention relates to a structure of a water jet injection nozzle for performing work for scraping off a damaged surface portion of an existing concrete surface (hereinafter referred to as chiseling work).

[0002]

2. Description of the Related Art Up to now, when repairing damaged parts of tunnels, road surfaces, bridge piers, and other reinforced concrete structures, first, the concrete in the damaged parts of the structures is scraped off by a chiseling work, and It is widely practiced to fill a new concrete material to reinforce the structure. The chipping work is generally performed by a pick or breaker using high pressure air.

However, in the chiseling work by the pick or breaker using such high pressure air, there is a problem that a large noise is generated in the surroundings and the worker is physically injured by the vibration by the pick or breaker. Has become. Further, although it is sufficient to scrape off only the concrete portion that is originally damaged, there is a problem in that the impact force of the pick or breaker causes cracks in the concrete portion in a healthy state.

Therefore, in recent chipping work, instead of a pick or breaker, a high-pressure water jet sprayed from a single nozzle tip is used for chipping a damaged concrete part. For example, as shown in FIG. 13, as a device for injecting a high-pressure water jet 3, a lance device 2 having a single water jet injection nozzle 1 at its tip is widely used.

As is well known to those skilled in the art, the water jet injection nozzle 1 is a water supply tank containing water for performing chiseling work, and water supplied from the water supply tank is necessary for concrete crushing (concrete strength). A high-pressure water generator that uses high-pressure water (about 3 to 4 times), a water treatment device for treating the high-pressure water after scraping off the concrete surface damaged by the high-pressure water, etc. (all not shown) are required. However, incidental equipment costs are required, but it is possible to prevent cracks from entering the concrete body due to the work with the pick or breaker as described above, and furthermore, the healthy concrete surface that appears after the chipping work is exposed to high pressure water. Since it is washed and many small irregularities are generated on the chiseling work surface by high pressure water, the adhesion of new concrete is good, Such concrete has the advantage that it is possible to completely remove the only place that has deteriorated to leave.

Here, the lance device 2 has a high-pressure water receiving portion 4 for receiving the high-pressure water obtained by converting the water supplied from the water supply tank into the high-pressure water by the high-pressure water generator, and jetting the high-pressure water by water jet. It is provided with a lance main body 5 for sending toward the nozzle 1, and a separate water jet injection nozzle 1 attached to the tip of the lance main body 5. When using, the water jet injection nozzle 1 is swung left and right. It is known to those skilled in the art that the chiseling work is performed while scattering the water jets 3 ejected from the water jet 3 in the left-right direction.

[0007]

However, in the water jet injection nozzle 1 which provides such excellent characteristics, the reinforcing bars for reinforcing the structure are embedded in the damaged concrete surface to be removed by the chipping work. In such cases, it is necessary to prevent damage to such rebar as much as possible. This is because damage to the reinforcing bar may have a great influence on the strength of the entire structure.

Therefore, in the chiseling work using the lance device 2 provided with the water jet injection nozzle 1 up to now, when the presence of the rebar is found in the damaged portion during the chiseling work, the side portions of the rebar are preliminarily obtained. The chiseling work is performed by digging up the surrounding concrete to a depth that allows the water jet nozzle to enter, and then crushing and removing the concrete under the reinforcing bar. Therefore, at one time, there was a problem in that it was necessary to remove the concrete in the originally healthy part around the reinforcing bar in order to chip the lower part of the reinforcing bar.

This is because the conventional water jet injection nozzle 1 has a structure in which the high-pressure water blown out from the nozzle 1 is always injected in only one direction. In this work, the surrounding concrete had to be removed in advance to such an extent that the long lance device 2 having the nozzle at the tip could face in that direction. Therefore, in the case where the reinforcing bars are assembled in a mesh pattern over a wide area, it is actually very difficult to carry out the chipping work with the water jet injection nozzle.

Therefore, it is strongly desired to develop a water jet injection nozzle or a water jet injection nozzle capable of freely adjusting the blowing direction of high-pressure water so as to perform the chiseling work around the reinforcement without digging up around the reinforcement. Was there.

[0011]

In order to solve the above problems, the present invention provides a water jet injection nozzle device having a plurality of water jet injection nozzles mounted on a lance body for providing a water jet for performing chiseling work. That is, the water jet ejected from each nozzle converges at one point and moves in one direction while injecting the water jet in a zigzag or arc shape while inclining the jet nozzle in a predetermined direction. Then, there is provided a chipping method in which the nozzle is moved in the other direction while inclining the nozzle in the opposite direction and jetting a water jet in the same zigzag or arc shape.

[0012]

According to the water jet spraying nozzle device of the present invention, the water jets sprayed from the plurality of nozzles are sprayed so as to completely surround the periphery of the reinforcing bar, so that the chipping work on the concrete around the reinforcing bar is surely performed. Can be achieved. Further, according to the chipping method of the present invention, even when the reinforcing bars are arranged in a cross shape, the concrete around all the reinforcing bars can be reliably chipped.

[0013]

1 is a schematic side view of a lance device 12 having a water jet injection nozzle device 10 of the present invention. This lance device 12 includes a water jet 13
A nozzle device 10 for injecting water, and a lance body 16 for supplying high-pressure water to the nozzle device 10, the distal end portion being connected to the central portion of the nozzle device 10 and the high-pressure water receiving portion (not shown) being attached to the base end portion. And a lance body 16 that is formed.

Here, the water jet injection nozzle device 10 has a pair of water jet injection nozzles 14 and 14 which are arranged at both ends at predetermined intervals and are directed inward toward each other, for example, at an angle a. The pair of nozzles has a generally T-shape having a connecting portion 18 extending toward the opposite side of the nozzles from the middle portion of the pair of nozzles, and the connecting portion 18 has a lance main body 16 The tail end is received. Further, the nozzle device 10 is provided with a high-pressure water flow passage 20 which branches through the central portion of the connecting portion 18 toward the left and right nozzles 14. The water jets ejected from the plurality of nozzles 14, 14 through the passage 20 converge on a point O on the longitudinal axis of the lance body 16. The lance body 1
6 and the high-pressure water receiving portion, and the detailed functions and structures of the respective water jet injection nozzles 14 are well known to those skilled in the art as shown in FIG. 13, and will not be described in detail.

In the nozzle device 10 (FIG. 1) of the present invention, the high-pressure water supplied from the lance body 16 is branched into two directions in the passage 20 of the device 10, and thereafter, the high-pressure water is paired. About 80 liters of water per minute is ejected as the water jet 13 from the nozzles 14 and 14 so as to converge toward the point O, and the chipping work is performed by this water pressure. In the present invention, as shown in FIG. 3, when carrying out chiseling work on a concrete surface where longitudinal reinforcing bars L and lateral reinforcing bars D are arranged to intersect, the lance body 16 is moved to a predetermined position 17 (see FIG. It swings about 1) to one side over an angle of about 5 degrees (10 degrees on both sides) (see arrow 11 in FIGS. 2 and 3).

Further, at this time, the lance device 12 stands up from the concrete surface A by an angle (b) of about 70 to 73 degrees as shown in FIG. While moving toward d), perform chiseling work,
Then, the inclination angle of the lance device 12 is moved in the {2 × (90 ° −b)} direction to the position shown by the broken line in FIG. 4 to move in the direction (e) opposite to the one direction (d) (FIGS. 3 and 4). It is desirable to carry out chiseling work while moving to (4).

As a result, in the nozzle device 10 of the present invention,
The locus of point O shown in FIG. 1 depicts a jagged line state with an amplitude f as shown in FIG. Furthermore, the locus of point O is
An arc (a-b-c-d-e) having a diameter of s as shown in FIG.
-F-g-h-i-j-k-l-m-n-o-p-q)
It is also possible to move the lance device 12 so as to draw. In the embodiment of FIG. 6, when the lance body is returned in the direction e, the lance device 12 may be rotated in the arc rotation direction in the direction opposite to the going direction, or may be rotated in the same direction as the going direction. Good. Then, the lance device 12 is moved in the direction along the transverse reinforcing bar D by a distance slightly smaller than the amplitude f or the diameter g to make a similar reciprocating motion.

As the pair of nozzles 14 and 14 reciprocate in such a polygonal line or arcuate state, concrete around the reinforcing bar 22 is ejected from each angular position as shown in FIG. 13a,
It is almost completely broken by 13b, 13b, 13c and 13c. By changing the swing angle or the arc diameter of the lance device 12, it is possible to almost completely cope with the reinforcing bars having different diameters.

At this time, first, the lance device 12 is tilted at the angle b and moved in the direction e to perform the chipping work, and then the lance device 12 is indicated by a broken line {b.
It is also possible to perform the chiseling work while inclining to an angular position of + {2 × (90 ° −b)} and moving in the state in the direction of d.

In the illustrated embodiment, the inclination angle a of the nozzle 14 is set to about 65 degrees, but it is not limited to this. According to the experiment, in relation to the outflow amount of water, in the ordinary chipping work, about 20
It has been found to be efficient to carry out the chipping at a position about 30 mm apart.

That is, when the chipping device according to the present invention is used for chipping work, the lance device 12 is positioned by tilting the lance device 12 in a direction along the concrete surface rather than a vertical position with respect to the concrete surface, and the water jet injection nozzle It is placed at a position of 20 to 30 mm from the chisel surface, and further, while swinging the water jet injection nozzle left and right, it moves in one direction along the concrete surface, and then the lance device 12 is moved beyond the vertical position with respect to the concrete surface. The water jet nozzle is positioned at the same position as the direction along the concrete surface, and the water jet nozzle is placed at a position of 20 to 30 mm from the chisel surface, while swinging the water jet nozzle left and right along the concrete surface. Optimum chipping work by moving in the direction opposite to the one direction It can be achieved. Furthermore, the lance device 12 is positioned in a direction along the concrete surface rather than the vertical position with respect to the concrete surface, and the water jet injection nozzle is arranged at a position 20 to 30 mm from the chisel surface. Is moved in one direction along the concrete surface while drawing an arc, and then the lance device 12 is positioned over the vertical position with respect to the concrete surface to a position substantially the same as the direction along the concrete surface, and water jet injection is performed. By appropriately moving the water jet jet nozzle along the concrete surface in a direction opposite to the one direction while drawing an arc while the nozzle is placed at a position of 20 to 30 mm from the chiseling surface, an appropriate chipping work can be similarly performed. It can be achieved.

FIG. 8 describes another embodiment of the present invention. This embodiment shows a lance device 30 in which a nozzle device 28 having five water jet injection nozzles 26 is mounted on a lance body 24 similar to that described above. Here, the water jet injection nozzle 26 is screwed with a closing means 32 such as a sealing plug which can be manually adjusted. As for the method of using the lance body 24, as in the case described above, the water jet 34 draws a broken line state,
Try to draw an arc. In particular, in the embodiment shown in FIG. 9, when all the nozzles are opened, the water jets 34 jetted from the respective nozzles converge on a point O1 on the longitudinal axis of the lance device 30. However, when the arrangement state of the reinforcing bars is different in the vertical direction and the horizontal direction, it is possible to select the nozzle to be used in advance and perform a more effective chiseling work. For example, lateral direction (see D in FIG. 3)
When there are more reinforcing bars in the vertical direction (see L in FIG. 3), the injection nozzles 26a, 26c, 26e in FIG.
Used in the closed state. This can prevent wasteful use of the water jet. For this reason, each injection nozzle has a closing means 32, such as a screw-type closing cap, which can selectively close the nozzle. This is because the chipping work occurs at a point closer to the nozzle than the convergence point O1 of the water jet, and it is possible to reduce the water jet that collides with the lateral reinforcing bar itself to some extent.

On the other hand, when there are more vertical reinforcing bars than horizontal reinforcing bars, the injection nozzles 26b, 26 in FIG.
Use with d and 26e closed. This can prevent wasteful use of the water jet. This is because the chipping work occurs at a point closer to the nozzle than the convergence point O1 of the water jet, and the water jet that collides with the longitudinal reinforcing bar itself can be reduced to some extent.

When the swing motion or the arc motion of the lance body cannot be properly performed due to the side vertical wall or the like, the convergence point O2 of the water jet is set as shown in FIGS. It can be pre-biased in one direction from the longitudinal axis. Also at this time, it is possible to select the nozzle to be used in advance.

[0025]

According to the present invention, a water jet jet nozzle or a water jet jet nozzle capable of freely adjusting the jetting direction of high-pressure water so that the chiseling work around the rebar can be performed without digging up around the rebar. Will be provided. Therefore, even when it is found that there is a reinforcing bar in the damaged portion during the chipping work, it is possible to carry out the chipping work only on the damaged part around the reinforcing bar without excavating healthy concrete around the reinforcing bar.
Therefore, even if the concrete surrounds the reinforcing bar, it is not necessary to remove the originally healthy concrete. Therefore, in the chiseling work according to the present invention, the reinforcing bar itself is not damaged, and the strength of the entire structure is not affected at all. Moreover, the chipping work becomes easy, and the repair work volume after that is reduced. Therefore, it has an excellent effect such as reduction of personnel, time and cost required for repair.

Moreover, according to the present invention, the water jet can be freely and without damaging any of the reinforcing bars, especially when the reinforcing bars are assembled in a mesh pattern over a wide area. It is possible to provide the effect of enabling the chipping work by the injection nozzle.

[Brief description of drawings]

FIG. 1 is an overall side view of a lance device 2 showing a first embodiment of the present invention.

FIG. 2 is a view taken along the line 2-2 of FIG.

FIG. 3 is a view showing a usage state of the lance device of the present invention, and is a view of the reinforcing bar and the lance device seen from above.

FIG. 4 is a view showing a usage state of the lance device of the present invention, which is a view of the reinforcing bar and the lance device seen from the side.

FIG. 5 is a diagram showing a trajectory drawn by the water jet of the present invention during chipping work.

FIG. 6 is another diagram showing a trajectory drawn by the water jet of the present invention during chipping work.

FIG. 7 is a diagram showing a state when the water jet of the present invention is chiseling around a reinforcing bar.

FIG. 8 is a view similar to FIG. 1, showing another embodiment of the present invention.

9 is a view taken along the line 9-9 of FIG.

10 is a diagram showing a state of a water jet ejected from the nozzle shown in FIG.

FIG. 11 is a view similar to FIG. 9 showing still another embodiment.

12 is a diagram showing a state of a water jet ejected from the nozzle shown in FIG.

FIG. 13 is a view showing a lance device provided with a known water jet injection nozzle.

[Explanation of symbols]

10: Water jet injection nozzle device 12: Lance device 13: Water jet 14: Water jet injection nozzle 16: Lance body 18: Connection part 20: High pressure water flow passage 22: Reinforcing bar 24: Lance body 26: Injection nozzle 28: Nozzle device 30: Lance device 32: Closing means 34: Water jet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B05B 13/04 B05B 13/04 4F033 E04G 23/08 E04G 23/08 E 4F035 E21D 11/00 E21D 11/00 Z // E01C 23/12 E01C 23/12 Z E01D 21/00 E01D 21/00 (71) Applicant 599054488 Delos Co., Ltd. 454-1 Minami Kofu-cho, Kanazawa-shi, Ishikawa Prefecture (72) Fumihiro Saito Nono-shi, Ishikawa-ken, Ishikawa Prefecture 5-201, Machibori, F-term in Eco Japan Co., Ltd. (reference) 2D053 AA03 AA22 AB08 AD01 AD03 BA10 2D055 KB08 LA16 2D059 AA03 BB39 GG41 2E176 AA01 DD28 3C060 AA14 AA16 AA20 CE02 CE08 CE23 CE28 4F03F35B31 P01 P31 P31 P18B01

Claims (6)

[Claims] 1. A water jet injection nozzle device 10 comprising a plurality of water jet injection nozzles 14 mounted on a lance body 16 for providing a water jet 13 for carrying out a chiseling work.
4. A water jet injection nozzle device in which the water jets injected from No. 4 converge on one point. 2. The water jet injection nozzle device according to claim 1, wherein the point where the water jet converges is on the longitudinal axis of the lance body 16. 3. The water jet injection nozzle device according to claim 1, wherein the point at which the water jet converges is on an axis deviated from the longitudinal axis of the lance body 16 to one side. 4. The water jet injection nozzle device according to claim 1, wherein the water jet injection nozzle 14 has a means capable of being selectively closed. 5. A water jet injection nozzle device 10 comprising a plurality of water jet injection nozzles 14 mounted on a lance body 16 providing a water jet 13, wherein the water jets injected from each nozzle 14 converge at one point. A chipping method for chipping concrete having a reinforcing bar therein by using a water jet injection nozzle device (10), wherein a lance body (16) is positioned in a direction along a concrete surface rather than a vertical position with respect to the concrete surface. The water jet injection nozzle is 20 to 3 from the chipping surface.
0 mm position, moving the water jet injection nozzle in one direction along the concrete surface while swinging left and right, and then moving the lance body 16 beyond the vertical position with respect to the concrete surface. Position the water jet nozzle at approximately the same position as the direction along with,
While arranging at a position of 0 mm, while moving the water jet injection nozzle to the left and right, the water jet injection nozzle is moved along the concrete surface in the direction opposite to the one direction, and the chipping method comprises various steps. 6. A water jet injection nozzle device 10 comprising a plurality of water jet injection nozzles 14 mounted on a lance body 16 providing a water jet 13, wherein the water jets injected from each nozzle 14 converge at one point. A chipping method for chipping concrete having a reinforcing bar therein by using a water jet injection nozzle device (10), wherein a lance body (16) is positioned in a direction along a concrete surface rather than a vertical position with respect to the concrete surface. The water jet injection nozzle is 20 to 3 from the chipping surface.
0 mm position, moving the water jet injection nozzle in one direction along the concrete surface while drawing an arc, and then moving the lance body 16 beyond the vertical position with respect to the concrete surface and along the concrete surface. The water jet injection nozzle from the chipping surface 20 to 3
While arranging at a position of 0 mm, the water jet injection nozzle is moved in a direction opposite to the one direction along the concrete surface while drawing an arc, and a chipping method comprising the following steps.