JP2009022914A - Wire conduit crushing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently crush and remove asbestos without damaging and scattering a wire passed through an existing wire conduit made of asbestos (ACP pipe). <P>SOLUTION: A hydraulic cylinder 5 is provided on a fixed base 3 removably connected with a supporting plate 2, and a pressing attachment 6 is attached to the tip end of a ram 5a of the hydraulic cylinder 5. The pressing attachment comprises a plurality of button bits 6b spaced apart in the longitudinal direction, structured into a plurality of rows spaced apart in the width direction and provided on the front end of a base section 6a. Further, a retainer member 7 inhibiting the pressing attachment 6 from turning around the ram 5a is provided, and the conduit made of asbestos is crushed by pressing the conduit from outside by the pressing attachment 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is efficient without damaging the wires passing through the existing wire conduits, in particular, asbestos wire conduits (ACP tubes) installed in bridges, etc., or scattering the asbestos. The present invention relates to a conduit crusher that can be crushed and removed.

  At locations where underground cable conduits cross rivers, etc., conduits are installed along bridges, or independent dedicated bridges are provided to cross rivers. ACP pipes have also been used as fireproof protection pipes for electric cables (power cables) installed along this bridge, etc., but it has been elucidated that asbestos is one of the causative substances of health hazards. In addition to the prohibition of new use, it has been requested to remove the existing parts, so that the existing ACP pipes can be replaced with pipes made of materials that are free from environmental problems in order to meet the demand. It has been done.

  Various methods have been sought for the removal of the existing ACP pipe, but the ACP pipe installed in the lower part of the bridge, etc. is not damaged, while taking into consideration environmental issues. No device or method that can be removed efficiently has been developed.

Pipelines that do not pass through the wires can be removed from the joint and removed, but pipes that pass through the wires cannot. For a pipe line through which the electric wire passes, there is a method of crushing with a hammer or the like as a general removal method.
In addition, the ACP pipe embedded in the housing is crushed by water pressure by feeding a high-pressure water injection nozzle into the interior, and the existing pipe to be removed by the force of the hydraulic cylinder with the rotary blade sharpened at the outer periphery. The pipe splitting device of Patent Document 2 below is also proposed, in which the existing pipe is rolled in the longitudinal direction of the existing pipe and the existing pipe is split in the circumferential direction by repeatedly rolling the rotary blade while increasing the amount of bite. Has been. However, these methods and apparatuses have the following problems.

JP 2000-226942 A JP 2001-241567 A

  Although the method of crushing the pipeline is the simplest and easy to implement, this method that relies on humans involves the risk of damaging the internal wires. Further, since a brittle ACP pipe is shattered and powder is scattered when an impact is applied, this method is not suitable for removing an ACP pipe installed in an exposed state.

  Further, in the method of Patent Document 1 in which high pressure water is jetted onto the inner surface of the pipe and the ACP pipe is pulverized by water pressure, when the electric wire is passed through the inside of the ACP electric line, the high pressure water injection nozzle is inserted into the pipe. Insertion is easily regulated. In addition, the ACP pipe for protecting the electric wire is often provided in an exposed state below the bridge, and when the ACP pipe is crushed with water pressure, the generated asbestos debris is scattered around. Therefore, this method is also not suitable for removing the ACP tube.

  For this reason, using the apparatus which the said patent document 2 is disclosing removed the ACP pipe | tube installed as an electric conduit. If the pipe splitting device disclosed in Patent Document 2 can be used, the ACP pipe can be broken vertically and removed without applying a strong impact and without using water.

  However, the ACP pipes for electric conduits provided on bridges and the like are suspended from the lower surface of the bridge, etc., and there are several support points at intervals of several meters. In the apparatus of Patent Document 2 in which the rotary blade is rolled by moving the pipe in the longitudinal direction of the pipe, the movement of the apparatus at the support point is hindered by the support tool, and the ACP pipe cannot be cut over the entire length. Further, as shown in Patent Document 2 in the same document, when the outer existing pipe is cut while supporting the new inner pipe, the outer peripheral rotation of the existing pipe is rotated by 180 ° with two sets of rotating blades arranged opposite to each other. If the object to be removed is an ACP pipe that is not supported on the inside, the upper rotary blade that receives the weight of the device cuts through the pipe wall first. Since the force that bites the rotary blade into the tube may not work, reliable cutting with the lower rotary blade is not guaranteed.

  As a countermeasure, we tried to crush by pressing instead of cutting the ACP pipe. However, if pressure is applied with a commercially available hydraulic punch or the like, the pressurizing tool breaks the pipe wall before the pipe breaks against expectations. There was only a hole in the ACP pipe, and the pipe was not crushed.

  In order to prevent the health damage caused by asbestos, it is desired to replace the existing ACP pipes with the conduits made of materials free from environmental problems as soon as possible. There is nothing that can efficiently remove bare ACP tubes without causing health problems.

  In order to meet the above requirements, that is, to realize early replacement with a conduit that does not cause health damage, the present invention uses an existing ACP conduit that is to be removed with an electric wire passed through the tube. It is an object to enable efficient crushing without damaging and preventing asbestos scattering.

  In order to solve the above problems, in the present invention, a support plate that is fixed to the electric conduit, a fixing base that is connected to the supporting plate, and the electric conduit that is attached to the fixing base are connected to the support plate. A fixed stay sandwiched between them, a hydraulic cylinder attached to the fixed base with the ram facing the support plate side, and a pressure attachment attached to the tip of the ram are provided, and the hydraulic cylinder is operated to attach the pressure attachment to the It pressed against the electric conduit and applied pressure in the diameter direction to the electric conduit made of asbestos to crush the electric conduit.

Preferred forms of this conduit breaker are listed below.
(1) The pressure attachment is configured such that a plurality of button bits are provided in front of the base in the pressurizing direction, and pressure is applied uniformly to the outer peripheral surface of the conduit with each button bit.
(2) The button bit is formed into a hemispherical bit, and a plurality of hemispherical button bits are arranged at intervals in the pipe longitudinal direction to form a button bit string, and the button bit string is spaced in the width direction. Opened in multiple rows. The pipe longitudinal direction referred to here is the longitudinal direction of the removal target electric line when the crusher is mounted (the same applies to the following).
(3) Provided with a restraining member for preventing rotation of the pressure attachment with the ram as a fulcrum.
(4) The fixed stay is provided on one end side and the other end side of the fixing base in the longitudinal direction of the pipe, the restraining member is provided between the two fixed stays, and one side surface of the pressure attachment is restrained. It is intended to contact the member.
(5) Provided with an adjustment plate capable of adjusting the restriction position for regulating the stroke of the ram by regulating the return amount of the ram of the hydraulic cylinder.
(6) The support plate and the fixing base are connected by a plurality of bolts and nuts that fix the bolts to the support plate and the fixing base.

  In the conduit breaker of the present invention, the pressure attachment is pressed against the outer periphery of the ACP conduit by the force of the hydraulic cylinder, so that pressure is applied to the conduit in the entire area of the pressure attachment. For this reason, concentration of the applied pressure is avoided, and a strain that destroys the applied conduit is effectively applied, and the ACP conduit is crushed well. In particular, when using a pressure attachment in which a plurality of button bits are provided on the front surface of the base and each button bit applies pressure uniformly to the electrical conduit, the button bit is a hemispherical bit. In particular, when using a pressure attachment in which a plurality of button bits are arranged at intervals in the longitudinal direction to form a button bit string and the button bit string is provided at a plurality of intervals in the width direction, the pressurizing force is used. Is distributed over a wide range and added from each button bit to the conduit. Further, by pressurizing a plurality of locations of the electric conduit with the displaced button bits, a strain that destroys the electric conduit is effectively applied, and the ACP electric conduit is crushed well.

  Moreover, since the applied pressure is generated by the hydraulic cylinder, it is difficult for the impact to be applied to the electric conduit, and the fragments are not scattered. Further, by controlling the stroke of the ram of the hydraulic cylinder, it is possible to eliminate damage to the electric wire in the pipeline.

  Furthermore, since the electric conduit is sandwiched between the support plate and the fixed stay and the support plate and the fixed base are connected at that position, the pressurizing stroke by the hydraulic cylinder at each pressurization can be stabilized. The stabilization of the pressurization stroke averages the strain applied to the electrical conduit by each pressurization, and a crushing effect with little variation can be obtained by each pressurization. In addition, the hydraulic cylinder whose ram stroke can be adjusted can more appropriately protect the electric wire in the pressure line by optimizing the pressure stroke.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6 of the accompanying drawings. 1 to 5 show a first form, and FIGS. 1 to 3 show an outline of the entire crusher of the first form. The illustrated conduit crusher 1 includes a support plate 2 and a fixed base 3 arranged opposite to each other, two fixed stays 4 and 4 attached to the fixed base 3, a hydraulic cylinder 5 also attached to the fixed base 3, A pressure attachment 6 attached to the tip of the ram 5a of the hydraulic cylinder 5, a restraining member 7 for preventing rotation with the ram 5a of the pressure attachment 6 as a fulcrum, and an adjustment for adjusting the stroke of the ram 5a of the hydraulic cylinder 5 The plate 8 includes an adjustment screw 9 that adjusts the position of the adjustment plate 8, and a connecting member 10 that connects the support plate 2 and the fixing base 3 to each other.

  The support plate 2 is constituted by a flat plate having a simple shape. If the flat support plate is used, the electric conduit is not easily restrained, and distortion for breaking the electric conduit is more effectively applied. Further, the fixing base 3 presses the flat plate base portion 3a serving as a reaction force receiver and the edges of one end side and the other end side (both ends in the X-axis direction in FIG. 1) of the base portion 3a toward the support plate 2 side. Although the one made up of the holding metal fittings 3b having an L-shaped cross section is used, a frame that is integrally formed as a whole may be used. The support plate 2 and the fixing base 3 are arranged in parallel with the electric conduit 20 introduced therebetween, and are connected by a connecting member 10 to assemble the crusher 1.

  The fixing base 3 and the support plate 2 are connected by screwing the four bolts (the stud bolts in the figure) 10a, a nut 10b for fixing one end of each bolt 10a to the support plate 2, and each bolt 10a. This is performed by using a connecting member 10 combined with a nut 10c for fastening the presser fitting 3b. The fixing base 3 and the support plate 2 can be disconnected by releasing the connection by the connecting member 10. Thus, what connects the support plate 2 and the fixing stand 3 with a volt | bolt and a nut can respond easily to the size fluctuation of an electric conduit, and the utilization range of a crusher spreads.

  We considered a structure in which a belt is wrapped around a conduit and both ends of the belt are connected to a fixed base. In that structure, the conduit is restrained in a wide area by the belt, and the constrained part is reinforced. The electric conduit was not destroyed. The illustrated connecting member 10 that uses bolts and further uses a flat plate that is in line contact with the conduit as the support plate 2 does not have the problem of making the conduit difficult to break.

  The bolt holes 10d provided in the support plate 2 and the holding metal fittings 3b of the fixing base 3 are respectively long holes in the width direction (Y-axis direction in FIG. 1) in FIG. 1 and are passed through the bolt holes 10d and 10d. Although the position of 10a can be changed according to the diameter of the electric conduit, there is no particular problem even if the hole 10d is a round hole and the distance between the bolts 10a and 10a in the Y-axis direction in FIG. 1 is fixed.

  The hydraulic cylinder 5 is a single-acting cylinder, and is attached to the base 3 a of the fixed base 3 with the ram 5 a facing the support plate 2 side. The conduit breaker 1 of the present invention includes a hydraulic pressure source pump 11 that drives the hydraulic cylinder 5, and the hydraulic cylinder 5 is connected to the pump 11 via a hose 12. The pump 11 may be a manual pump or an electric pump.

  The pressure attachment 6 is attached to the tip of the ram 5a. This pressure attachment 6 has a length (X-axis direction dimension in FIG. 1) 1 of the base portion 6a having a square cross section shown in FIG. 4 as a width w (Y-axis direction dimension in FIG. 1) shown in FIGS. The button bit 6b is provided on the front surface of the base portion 6a. A plurality of button bits 6b are arranged at intervals along the length of the base 6a to form a button bit string, and the button bit strings are arranged in front of the base 6a at intervals in the width direction of the base 6a. Provided. With this configuration, the button bit 6b is pressed against a wide area of the conduit, and the applied pressure is dispersed to uniformly pressurize the outer periphery of the conduit with each bit. Note that the button bit 6b is preferably a hemispherical bit at the tip, but a column-shaped bit or a truncated cone bit can also achieve the purpose of uniform pressurization when the tip is oriented toward the center of the conduit. it can.

  The fixed stays 4 are provided at one end and the other end (both ends in the X-axis direction in FIG. 1) of the base 3a of the fixed base 3 so as to extend toward the support plate 2 side. The two fixed stays 4 and 4 with the pressure attachment 6 opposed to each other are formed such that the tips extending toward the support plate 2 are formed as concave arc surfaces along the outer periphery of the wire conduit to be removed. . These fixed stays 4 and 4 can be attached to and detached from the base 3a, and several types are prepared with different curvature radii of the concave circular arc surface at the tip, and used while exchanging with ones that match the pipe diameter. May be.

  The restraint member 7 is provided between the fixed stays 4 and 4 with both ends supported by the fixed stays 4 and 4 arranged opposite to each other. One side surface of the pressure attachment 6 is brought into contact with the restraining member 7 so as to restrain the pressure attachment 6 (see FIG. 3), whereby the pressure attachment 6 with the ram 5a as a fulcrum is rotated. Is prevented. For this reason, each of the button bits 6b provided on the pressure attachment 6 is pressed against the electric conduit on average, and distortion that breaks the electric conduit is effectively applied to the electric conduit.

  The adjustment plate 8 regulates the return amount of the ram 5 a of the hydraulic cylinder 5, and the axial position of the hydraulic cylinder 5 can be adjusted by operating the adjustment screw 9 supported by the fixed base 3. With this adjustment, the return restricting position of the ram 5a by the adjusting plate 8 changes, and the actual stroke of the ram 5a is adjusted.

  The conduit breaker 1 configured in this way is used as shown in FIGS. First, the support plate 2 is placed along the outer periphery of the electric conduit (ACP electric conduit) 20 to be removed, and the electric conduit (ACP electric conduit) is between the bolts 10a fixed in advance at the four corners of the support plate 2. 20 passes. Next, the fixed base 3 is set at a position where the electric conduit 20 is sandwiched between the support plate 2 and the support plate 2 and the fixed base 3 are connected. The work is performed with the fixed stays 4 and 4 aligned in the longitudinal direction of the conduit 20 and the tips of the fixed stays 4 and 4 applied to the outer periphery of the conduit 20 and then the presser fitting passed through the bolt 10a. 3b is applied to both ends of the base 3a, and the presser fitting 3b is tightened with the nut 10c. As a result, the base 3 a is pressed against the presser fitting 3 b, and the electric conduit 20 is sandwiched between the support plate 2 and the fixed stay 4. At this time, the hydraulic cylinder 5 attached to the base portion 3 a is pulled to a position where the ram 5 a contacts the adjustment plate 8, and the pressure attachment 6 attached to the tip of the ram is not in contact with the electric conduit 20. Is in a state.

  Next, oil is supplied from the pump 11 to operate the hydraulic cylinder 5, and the outer circumference of the electric conduit 20 is pressurized with the pressure attachment 6 attached to the tip of the ram 5 a. As the ram 5a is pushed out, the strain applied to the electric conduit 20 increases, and until the ram 5a reaches the end of the stroke, the strain overcomes the strength of the conduit and the electric conduit 20 is crushed.

  Since the electric conduit crusher 1 is provided with the adjusting plate 8, the electric wire 21 (see FIG. 3) in the electric conduit 20 is pressurized by appropriately adjusting the substantial stroke of the ram of the hydraulic cylinder 5. The situation can be easily avoided.

  Even in the crusher without the adjusting plate 8, the pressure attachment 6 is applied to the outer periphery of the electric conduit 20 in a state where the ram 5a is pulled to the end point, and from the position, the fixing base 3 is equivalent to the excess stroke of the hydraulic cylinder. The moving end position of the pressure attachment 6 can be controlled by adopting the method of pulling away from the support plate 2 and fixing it to the bolt 10a. However, if the adjustment plate 8 is provided, such troublesome work is not performed. However, the substantial pressure stroke can be adjusted.

  FIG. 6 shows a second form. The conduit breaker 1 has a length of the support plate 2 and the fixed base 3 longer than that of the first embodiment, and a hydraulic cylinder 5 and a pressure attachment 6 are attached to one base 3 a in the length direction of the fixed base 3. Two sets are provided at different positions. Other configurations are the same as the first embodiment. The pressure attachment 6 is the same as that employed in the crusher of the first form. As described above, a plurality of sets of the pressure attachment 6 and the hydraulic cylinder 5 that presses the pressure attachment 6 against the electric conduit may be provided in one crusher. If this crusher is used, the work is performed in comparison with the first embodiment. The length of electric line crushing per time becomes longer and the working efficiency is increased.

  A prototype of a conduit breaker using a commercially available single-acting cylinder with the capacity of 45 KN having the structure shown in FIGS. 1 to 3 and a diameter of φ100 mm to φ125 mm installed under the bridge using this prototype. The removal test of the ACP conduit was conducted. As a result, the ACP conduit was successfully crushed and removed without scattering asbestos with the prototype conduit breaker. In addition, when it is required to re-cover the exposed wire after removal of the conduit with a conduit that does not cause any health damage, the conduit made of refractory material vertically divided into two exposed wires. And the semicircular road walls arranged opposite to each other may be fixed to each other with a binding tool such as a band. As a result, the electric wire is covered with a new protective tube, and the replacement operation is completed.

The perspective view which shows an example of the electric conduit crusher of this invention Side view of the conduit breaker in FIG. Sectional view along line III-III in FIG. Perspective view of pressure attachment Front view of the pressure attachment in contact with the conduit Side view showing another example of the conduit breaker of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conduit breaker 2 Support plate 3 Fixing base 3a Base part 3b Presser fitting 4 Fixing stay 5 Hydraulic cylinder 5a Ram 6 Pressure attachment 6a Base part 6b Button bit 7 Restriction member 8 Adjustment plate 9 Adjustment screw 10 Connection member 10a Bolt 10b, 10c Nut 10d Bolt hole 11 Pump 12 Hose 20 Electric conduit 21 Electric wire

Claims (7)

A wire conduit crusher that applies pressure in the radial direction to an electrical conduit (20) formed of asbestos and crushes the electrical conduit, and a support plate (2) fixed to the electrical conduit (20) ), A fixing base (3) connected to the supporting plate (2), and a fixing stay attached to the fixing base (3) and sandwiching the conduit (20) between the supporting plate (2). (4), a hydraulic cylinder (5) attached to the fixed base (3) with the ram (5a) facing the support plate (2), and a pressure attachment (6) attached to the tip of the ram (5a) Provided,
A conduit breaker that operates the hydraulic cylinder (5) to press the pressure attachment (6) against the conduit (20).   The pressure attachment (6) is provided with a plurality of button bits (6b) in front of the base (6a) in the pressurizing direction, and the pressure is evenly applied to the outer peripheral surface of the conduit (20) with each button bit (6b). The electric conduit crusher according to claim 1, which is configured to be added.   The button bit (6b) is a hemispherical bit, and a plurality of hemispherical button bits are arranged at intervals in the longitudinal direction of the pipe to form a button bit string, and the button bit string is spaced apart in the width direction. The conduit breaker according to claim 2, wherein a plurality of rows are provided.   The conduit breaker according to any one of claims 1 to 3, further comprising a restraining member (7) for preventing rotation of the pressure attachment (6) with the ram (5a) as a fulcrum.   The fixed stay (4) is provided on one end side and the other end side in the pipe longitudinal direction of the fixed base (3), and the restraining member (7) is provided between the two fixed stays (4, 4). The conduit breaker according to claim 4, wherein one side surface of the pressure attachment (6) is brought into contact with the restraining member (7).   The adjustment plate (8) according to any one of claims 1 to 5, further comprising a position-adjustable adjustment plate (8) for regulating a stroke of the ram (5a) by regulating a return amount of the ram (5a) of the hydraulic cylinder (5). Electric conduit crusher.   The support plate (2) and the fixing base (3) are connected to each other by a plurality of bolts (10a), and nuts (10b, 10c) for fixing the bolts to the support plate (2) and the fixing base (3). The electric conduit crusher according to any one of claims 1 to 6, wherein the electric conduit crusher is provided.

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