JP2002309783A - Method and device for chipping reinforced concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for chipping the reinforced concrete capable of evenly chipping as much as possible a lower part of a vertical beam, a lower part of a lateral beam and a lower part of an intersection of the vertical beam and the lateral beam. SOLUTION: A nozzle 6 of a high-pressure fluid jet ejecting mechanism 5 for ejecting the high-pressure fluid, while always tilting forward in the traveling direction, is moved on a cradle 3 in the direction inclined in relation to the reinforcement. In order to form a strip chipping part WO having the predetermined width F, the strip chipping part is moved in the direction, in which the nozzle 6A crosses the cradle traveling direction FW, and the cradle 3 is made to travel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced concrete structure for repairing a flat reinforced concrete structure such as a bridge by removing only the concrete portion while leaving the reinforcing bars remaining. Method and apparatus. More specifically, the present invention relates to improvements in a method and apparatus for hanging a reinforced concrete structure for automatically performing a hanging operation.

[0002]

2. Description of the Related Art In bridges and other reinforced concrete structures, concrete is neutralized and damaged due to vibrations from roads, air pollution by exhaust gas and the like, and other causes. Therefore, it is necessary to perform a “hanging operation” in which only the concrete is removed while the reinforcing bars are left during the repair work or the like.

[0003] In order to remove only concrete, a technique using a water jet of about 1000 kg / cm ² is conventionally known. On the other hand, in the case of concrete removal by an impact actuated machine, there is a risk that the reinforcing steel may be bent or cracked and the reinforcing steel may be damaged, whereas if water jet is used, the reinforcing steel will not be damaged. Only concrete can be removed.

[0004] In addition, the efficiency is poor if only one row of water jets is jetted from a fixed nozzle, and the water jets move while oscillating.

[0005] As described above, a mobile suspension device that performs a suspension operation while oscillating a water jet,
Conventionally, various proposals have been made. Among them, the water jet injection nozzle is moved (including swinging) in a direction perpendicular to the traveling direction of the device (including swinging) to travel the entire device, and a predetermined portion of the “hang” is provided. The type of technology that performs the work is called "cradle type." Hereinafter, a conventional technique called “cradle type” will be described with reference to FIGS.

Normally, a flat reinforced concrete structure is provided with reinforcing bars parallel and perpendicular to the edges. The lifting device is usually moved parallel to the edge. Then, the water jet injection nozzle moves substantially in parallel with the rebar, so the back side (lower side)
Concrete cannot be cut. In particular, at the intersection of the vertical and horizontal streaks, the concrete on the backside remains.

[0007] Usually, when cutting a concrete structure, the apparatus is reciprocated many times and cuts sequentially and deeply. Therefore, the cutting direction of the water jet is substantially the same in both directions of reciprocation. (When the injection device is oscillated and the nozzle is moved in an arc, the cutting direction does not match, but even in this case, the straight line is rather straight. , Which are substantially the same), so that “undulations” occur with the cutting and the cutting is not uniform. That is, in a cradle type lifting device, the running direction of the device itself and the direction of the reinforcing bars necessarily coincide with each other, so that the water jet injection nozzle that moves in a direction substantially perpendicular to the running direction of the device also necessarily uses a reinforcing bar. Will match the direction.

In FIG. 2 to FIG. 4, a region requiring a suspending operation is indicated by reference numeral A as a whole, and a pair of upper and lower feed beam rails 2 A,
A feed beam 2 having 2A is arranged. A cradle 3 is provided movably guided by the upper and lower rails 2A, 2A, and a high-pressure fluid jet injection mechanism 5 is attached to the cradle 3.

As shown in FIG. 3, feed beam 2 is provided with feed beam rails 2A at upper and lower ends, and cradle wheels 3A,
Cradle 3 is supported via 3A. And
The cradle 3 is provided with a high-pressure fluid jet ejecting mechanism 5, and the jet ejecting mechanism 5 is provided with a high-pressure fluid jet ejecting member (referred to as “lance” in this specification) 6. At the tip of the lance 6, a nozzle 6A for jetting high-pressure fluid jet is provided (see FIG. 3).

A high-pressure fluid hose 8 is connected to the lance 6, and is connected to a high-pressure fluid supply source (not shown) (for example,
High-pressure fluid is supplied from a pump or the like. The lance 6 is moved by a swing mechanism 10 provided in the injection mechanism 5.
The high-pressure fluid jet is ejected while swinging as shown by an arrow SW. Note that the swing angle on the horizontal plane (the swing angle shown in FIG. 3) is indicated by reference numeral γ.
The swing angle γ is set at several degrees to about 20 degrees on both sides from the vertical axis Z in FIG. Note that the specific configuration of the swing mechanism 10 is not illustrated because a conventionally known mechanism is used.

As shown in FIG. 4, when the lance 6 is swung SW, the high-pressure fluid jet WJ collides with the surface to be suspended (the region to be suspended) A by the width indicated by the symbol "F". Will be done. Then, the high-pressure fluid jet injection mechanism 5 travels in a direction perpendicular to the plane of FIG. 4 (see a symbol RF indicating the traveling direction) while swinging the lance 6.

In FIG. 3, the direction of injection of the high-pressure fluid jet, that is, the axial direction of the lance 6 is set to the vertical axis Z in order to put concrete on the lower side (rear side) of a reinforcing bar (not shown in FIGS. 2 and 4). On the other hand, it is inclined in the traveling direction (arrow RF) (see FIG. 5 described later). This inclination angle is called an attack angle. In the example shown in FIG. 3, when the high-pressure fluid jet injection mechanism 5 advances to the right, the angle indicated by the symbol “α” becomes the attack angle, and when the high-pressure fluid jet injection mechanism 5 advances to the left, the symbol indicates the attack angle. The angle indicated by “β” is the attack angle. Note that the attack angles α and β
Is set, for example, from several degrees to about 30 degrees.

In FIG. 3, the swing direction (the swing direction of the high-pressure fluid jet) is perpendicular to the plane of FIG.
It is indicated by the symbol DSW indicating the traveling direction. On the other hand, in FIG. 4, the traveling direction RF is also the inclination direction of the attack angle. Referring again to FIG. 3, reference numeral C1 denotes the center of rotation of the lance 6 when setting the attack angles α and β. In FIG. 4, reference symbol C2 indicates the center of the swing SW of the lance 6.

When the high-pressure fluid jet injection mechanism 5 travels at a predetermined position on the feed beam 2 and travels from one end to the other end of the target surface A for fishing, a reverse direction is applied on the feed beam 2 to ensure uniform fishing. Travel on the same route. For example, in FIG. 3, after the high-pressure fluid jet injection mechanism 5 travels to the left, at the left end of the predetermined area of the feed beam 2, the lance 6 changes from the state of the attack angle β around the point C1 to the state of the attack angle α. Rotate. Then, the high-pressure fluid jet injection mechanism 5 starts running in the right direction. In this way, by performing reciprocating running in the left-right direction, and then moving in the direction perpendicular to the direction, and repeating the same, the entire object plane A can be suspended.

The trajectory of the high-pressure fluid jet impingement surface when the high-pressure fluid jet collides with the target surface A using the conventional cradle-type machine described with reference to FIGS. As shown in FIG. 5, the high-pressure fluid jet WJ or the lance 6 is moved in the traveling direction FW of the swing mechanism 10.
It is inclined to face. Then, as shown by an arrow SW in FIG. 6 (top view), the high-pressure fluid jet WJ or the lance 6
Swings. In FIG. 6, the traveling direction of the swing mechanism 10 is indicated by reference numeral FW (downward in the figure).

As can be seen from FIG. 6, since the lance 6 swings and the high-pressure fluid jet WJ is jetted, the jet WJ collides against the cutting surface A in an arc shape as indicated by the symbol WO and the suspension is suspended. Is performed. Then, the vehicle travels in the FW direction and jets are sequentially jetted, and the band is suspended in the predetermined width F shown in FIG.

FIG. 5 shows a mode in which the high-pressure fluid jet WJ collides with the target surface A when the swing mechanism 10 (the high-pressure fluid jet injection mechanism 5) moves to the left in the figure. When the lance 6 reaches a position corresponding to the left end of the target surface A, the lance 6 is turned around the center of rotation C1 (see FIG. 3), and the attack angle directed leftward (the attack angle β in FIG. 3). From the angle corresponding to the attack angle (the angle corresponding to the attack angle α in FIG. 3), the vehicle travels rightward to perform jet injection.

In this way, the high pressure fluid jet injection mechanism 5 makes several round trips on the same path, and if the fishing of a predetermined quality is performed, the feed beam 2 moves together with the cradle 3 and the high pressure fluid jet injection mechanism 5 to form a new area. Do fishing.

Next, with reference to FIGS. 5 to 8, the relationship between the high-pressure fluid jet WJ and the reinforcing steel and concrete on the surface A to be suspended will be described. In FIG. 5, since the high-pressure fluid jet WJ ejected from the nozzle 6A is inclined by the attack angle α (or the attack angle β), the high-pressure fluid jet WJ also collides with the region U-LT below the vertical line LT, and the vertical line L
The T-lower region U-LT is also removed. Here, in FIG. 5, reference numeral G1 denotes a reinforced concrete surface level before the “hanging operation”, and a level indicated by reference numeral G2 denotes a reinforced concrete surface after the “hanging operation”.

The high-pressure fluid jet WJ cannot cut the reinforcing bar, but only the concrete is cut and the reinforcing bar is left. Also, in FIGS. 5 to 8, the vertical streak LT is
The horizontal bar HT refers to a bar extending in the horizontal direction (the same direction as the direction FW in which the high-pressure fluid jet injection mechanism 5 moves on the beam 2).

FIG. 6 shows FIG. 5 upward (in the direction of arrow K).
Lance 6 and high-pressure fluid jet W
J is oscillated (symbol SW) at an oscillating angle γ, and a region WO “cut” by its high-pressure fluid jet WJ is shown. Here, the area U-HT below the horizontal muscle HT
Regarding (see FIG. 7), as apparent from FIG. 7 (a drawing in which FIG. 6 is viewed from the arrow L in front of the traveling direction FW),
If the lance 6 and the high-pressure fluid jet WJ swing SW at the swing angle γ, the high-pressure fluid jet WJ collides and “pulling” is performed.

FIG. 8 shows the hanging work described with reference to FIGS. 5 to 7 when viewed from an oblique direction in order to make the relationship between the vertical streak LT and the horizontal streak HT easier to understand.

The conventional cradle type lifting device described with reference to FIGS. 5 to 8 has been an effective machine. However, at the time of hanging work using the above-mentioned conventional cradle type hanging device, the rebar becomes an obstacle,
There are cases where the concrete under the reinforcing bars cannot be removed (partially remains).

That is, in the examples shown in FIGS. 5 to 8, the horizontal streak HT coincides with the traveling direction of the cradle 3 and the vertical streak LT
Is in the same direction as the swinging direction of the lance 6, so that there is a portion below the rebar which is not sufficiently hung, and the vehicle runs while swinging in a direction perpendicular to the running direction.
There are non-uniformities such as the occurrence of In particular, the portion below the intersection of the vertical and horizontal streaks cannot be cut.

[0025]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to propose a method and an apparatus for suspending reinforced concrete by a water jet, which can easily cut the concrete under the reinforcing bar. Another object of the present invention is to propose a method and an apparatus for suspending reinforced concrete, which can make the cut surface by water jet relatively uniform (flat).

[0026]

SUMMARY OF THE INVENTION A method of suspending reinforced concrete according to the present invention is to move a cradle (3) in parallel with a plane to be cut of a flat reinforced concrete structure, and to provide a high-pressure fluid jet provided on the cradle (3). In a method of suspending a reinforced concrete structure for cutting a concrete portion of a reinforced concrete structure by moving a nozzle (6A) of an injection mechanism (5), a high-pressure fluid is injected by being always inclined to the surface to be cut forward in the traveling direction. The nozzle (6A) of the high-pressure fluid jet injection mechanism (5) is moved on the cradle (3) in a direction inclining with respect to the rebar to form a band-shaped hanging portion having a predetermined width and then the band-shaped hanging portion. While moving the nozzle (6A) in a direction crossing the cradle (3), the cradle (3) is caused to travel in a direction opposite to the traveling direction.

Further, the reinforced concrete lifting device of the present invention runs a cradle (3) in parallel with a cutting surface (A) of a flat reinforced concrete structure, and jets a high-pressure fluid jet provided on the cradle (3). In a lifting device for a reinforced concrete structure for cutting a concrete portion of the reinforced concrete structure by moving the mechanism (5), the up-and-down movement is performed in opposition to a surface (A) to be cut.
A feed beam (2) having a pair of feed beam rails (2A, 2A) is provided, and the cradle (3) is disposed so as to be freely guided and guided by the feed beam rails (2A, 2A). Nozzle (6A) of the high-pressure fluid jet injection mechanism (5) provided in the cradle (3)
At predetermined attack angles (α, β) with respect to the vertical axis (Z)
Only the cradle (3) is always inclined forward in the traveling direction (FW), and its nozzle (6A) intersects with the traveling direction (FW) at an inclination of ± 45 ° ± 25 ° and has a predetermined width. Is configured to move.

The movement of the nozzle is not limited to linear movement by reciprocation, but may be arc movement by swing.

That is, according to the present invention having the above structure, conventionally, the nozzle (high-pressure fluid jet) moves (oscillates) in a direction orthogonal to the traveling direction (or the cradle traveling direction) of the high-pressure fluid jet injection mechanism. While
Moves in the inclined direction by a predetermined angle with respect to the running direction (oscillation)
Then, a high-pressure fluid jet is ejected.

Here, the predetermined angle is determined by the vertical line LT and the horizontal line HT.
Are inclined at an angle (angle A = angle B) and ± 25 ° (that is, ± 45 ° ± 25 °) with respect thereto. Here, + means clockwise, and-means counterclockwise. If the inclination angle is too small, there is no point in inclining. On the other hand, when the inclination angle is too large and approaches 90 °, the traveling direction and the moving direction match, and the area below the vertical streak cannot be properly connected. The inclination angle (± 45 ° ± 25 °) is determined based on these balances.

In practicing the present invention, the nozzle swinging mechanism in the existing cradle type device may be twisted by a "predetermined angle" (± 45 ° ± 25 °) with respect to the cradle. Is reduced as much as possible. In addition, other effects of the present invention include a reduction in working time, a reduction in cost, and an improvement in the quality of hanging work.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. In the present invention,
The feed beam 2 of the lifting device shown in FIGS. 1 to 4 described in the above “prior art”, the cradle 3 that can be guided by the feed beam 2 and travels,
Are similarly configured. Therefore, the same reference numerals and the like indicating the same configuration or direction will be used for the same reference numerals, and duplicate description will be omitted.

1 to 4 show one embodiment of the present invention. In FIG. 1, the illustration of the high-pressure fluid jet injection mechanism is omitted, and a lance 6 of the member is shown.
In this description, the case where the lance 6 swings (the nozzle moves in an arc) will be described as an example.

In FIG. 1, the lance 6 has a swing center axis C-SW, which is δ = 45 ° ± right to the right in the illustrated example with respect to the running direction (left side) FW of the high-pressure fluid jet injection mechanism 5. 2
It is attached so as to be inclined in the direction L1 twisted by 5 °. The swing angle is set to ε1, ε2 with respect to the center axis C-SW. Line L2 is S = −45 ° ±
25 ° is shown. If the center axis of the swing of the lance 6 is set to the line L2 in this manner, the hanging can be performed in a direction different from the case of L1 by about 90 °. With this combination, the flatness of the suspension surface is improved. Note that the attack angle (α or β) also depends on the axis L
1 (C-SW) direction (several degrees to about 30 degrees) as in the related art.

With such a configuration, the lance 6 is provided with the lateral muscle HT
Swinging about the center axis C-SW inclined at an angle δ with respect to the running direction FW parallel to Therefore, lance 6
The nozzle at the tip (not shown) moves in the direction crossing the running direction FW, and the jet of the high-pressure fluid jet is performed so that the jet collides with the target surface A in the range indicated by the symbol WO to perform the fishing. Then, since the vehicle travels sequentially in the direction of the reference sign FW and repeats the swinging SW, the belt is stripped to a predetermined width F.

Further, since the hanging portion WO is formed at an angle of about 45 ° with respect to the traveling direction FW, both the horizontal streak HT and the vertical streak LT intersect, and the attack angle α of the lance 6 causes the rebars HT, LT The lower area is also cut. And
When turning back to the opposite direction FWR,
Since the jet is jetted from the opposite side of T and LT at the attack angle β, cutting residue does not occur. In particular, since the ejection direction of the high-pressure fluid jet WJ is δ = 45 ° (± 25 °), the conditions for the vertical streak LT and the horizontal streak HT are almost the same, and the problem of non-uniformity in the prior art is solved. You.

[0037]

The present invention is configured as described above and has the following effects. (1) The high-pressure fluid jet also collides at an acute angle to the lower area of the vertical streak, the horizontal streak, and the intersection of the vertical and horizontal streaks, so that good "pulling" can be performed. (2) The high-pressure fluid jet is jetted at an inclination direction of ± 45 ° (± 25 °), and the vertical and horizontal streaks are under the same conditions, so that the underside of the rebar can be securely pulled. (3) Since the nozzle can be changed by ± 45 ° ± 25 °, that is, about 90 ° in a plane with respect to the traveling direction of the clade, it can be suspended at an angle different by about 90 °. Therefore, the flatness of the suspension surface is improved. (4) Since the mounting angle of the high-pressure fluid jet mechanism may be changed with respect to the conventional cradle-type device, capital investment is reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a main part of the hanging device.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a side sectional view for explaining concrete hanging by a high-speed fluid jet.

FIG. 6 is a plan view as seen from the arrow K in FIG. 5;

FIG. 7 is a front view as viewed in the direction indicated by an arrow L in FIG. 6;

FIG. 8 is a perspective view of FIG. 5;

[Explanation of symbols]

 2 ... Feed beam 2A ... Feed beam rail 3 ... Cradle 5 ... High pressure fluid jet injection mechanism 6 ... Lance (high pressure fluid injection member) 6A ... Nozzle 10 ... Swing mechanism HT: Horizontal streak LT: Vertical streak WJ: High-pressure fluid jet FW: Running direction C-SW: Center axis of swing WO: Hanging part

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Susumu Kato 1-7-7 Yutaka, Sakata-shi, Yamagata 4F term (reference) 2D059 AA14 GG39 2E176 AA01 DD29

Claims (2)

[Claims] 1. A cradle (3) running parallel to a plane to be cut of a reinforced concrete structure having a flat plate shape, and a nozzle (6A) of a high-pressure fluid jet injection mechanism (5) provided on the cradle (3) is moved. In the method of suspending a reinforced concrete structure for cutting a concrete portion of a reinforced concrete structure, a nozzle (6A) of a high-pressure fluid jet injection mechanism (5) for injecting a high-pressure fluid at an angle to the surface to be cut always forward in the traveling direction. ) Is moved on the cradle (3) in a direction inclined with respect to the reinforcing bar, and after a band-shaped hanging portion having a predetermined width is formed, the nozzle (6A) is moved in a direction crossing the band-shaped hanging portion. A method for suspending reinforced concrete, wherein the cradle (3) is run in a direction opposite to the running direction. 2. A cradle (3) running parallel to a cutting surface (A) of a flat reinforced concrete structure,
In a reinforced concrete structure lifting device for cutting a concrete portion of a reinforced concrete structure by moving a high-pressure fluid jet injection mechanism (5) provided in the cradle (3), the cradle (3) moves up and down in opposition to a surface (A) to be cut. A feed beam (2) having a pair of feed beam rails (2A, 2A) is provided, and the cradle (3) is disposed so as to be guided by the feed beam rails (2A, 2A) and run freely. The nozzle (6) of the high-pressure fluid jet injection mechanism (5) provided in the cradle (3)
A) is a predetermined attack angle (α, α) with respect to the vertical axis (Z).
β) is always inclined forward in the traveling direction (FW) of the cradle (3), and the nozzle (6A) intersects the traveling direction (FW) at an inclination of ± 45 ° ± 25 °. A reinforced concrete lifting device configured to move within a range of a predetermined width.