JP2009148690A - Crushing method and crusher for concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crushing method and a crusher for concrete structures which can prevent scattering of dust effectively with relatively small amounts of water during crushing target parts of a concrete structure. <P>SOLUTION: Crushing target parts of a concrete structure W are crushed with a pair of opening-and-closing crushing arms 33 and 33 arranged in a crusher 3. A spray nozzle 35 spraying water toward the target parts from the side of the cutting edge 331 of the crushing arm cutting into the target parts is disposed. Water spraying from the spray nozzle 35 is started when the crushing arms 33 and 33 are closed to start crushing of target parts, and the water spraying from the spray nozzle 35 is stopped when the crushing arms 33 and 33 are opened. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a method for crushing a concrete structure and a crusher suitable for the crushing method.

  In dismantling a concrete structure, generally, a crusher including a pair of crushing arms that open and close is used, and a portion to be crushed of the concrete structure is sandwiched between both crushing arms and crushed. Further, a blade portion is formed on one or both of the crushing arms, and when both crushing arms are closed, the blade portion bites into the crushing portion and causes a crack in the crushing portion. Crushing is possible.

  By the way, when a crushing operation is performed by a crusher, a large amount of dust is generated. Therefore, conventionally, a water spray nozzle is provided on a support frame on which a crushing arm is pivotally attached, and water is applied to a portion to be crushed to suppress generation of dust (for example, see Patent Document 1). .

However, if water is constantly sprinkled from the water nozzle during the demolition work of the concrete structure, a large amount of water is required. For this reason, the water tank which stores the water supplied to the watering nozzle is enlarged, and when this water tank is provided in the crusher, the crusher is enlarged. Therefore, it is conceivable to reduce the amount of water to be sprinkled to make the water tank smaller, but in this case, since the amount of water applied to the crushed part is small, water is put inside the cracked part of the crushed part where the blade part bites. May not enter sufficiently, and dust during crushing may be scattered around.
JP 2003-172033 A

  In view of the above points, the present invention provides a concrete structure crushing method and a crusher capable of effectively preventing dust from being scattered with a relatively small amount of water when crushing a portion to be crushed in a concrete structure. That is the issue.

  In order to solve the above problems, the present invention is provided with a pair of crushing arms that open and close, and uses a crushing machine in which a blade portion is formed on at least one crushing arm. In the crushing method in which the blade part is squeezed into the part to be crushed and crushed, an injection nozzle for injecting water from the blade part side toward the part to be crushed is provided, and both crushing arms are closed and the part to be crushed When starting crushing of water, the injection of water from the injection nozzle is started, and when both crushing arms are opened, the injection of water from the injection nozzle is stopped.

  According to the present invention, when the crushing part is crushed, water is sprayed from the spray nozzle only from the time when both crushing arms are closed until the time when both crushing arms are opened. Regardless of this, the amount of water to be used can be reduced as compared with the case where water is continuously applied to the portion to be crushed for a long time during the dismantling operation. According to this, even when a water tank or the like for storing water to be supplied to the spray nozzle is provided, the water tank can be made compact. In addition, by spraying water from the spray nozzle from the blade side of the crushing arm, water can penetrate into cracks caused by biting of the blade into the crushing part, so even if the amount of water is small Scattering can be reliably prevented.

  In order to solve the above-mentioned problem, the present invention comprises a pair of openable and closable crushing arms that are crushed across a portion to be crushed of a concrete structure, and a hydraulic cylinder that drives opening and closing of both crushing arms. In a crushing machine in which a blade part that bites into the crushing part is formed in one crushing arm, an injection nozzle that injects water from the blade part side toward the crushing part, and a water supply unit that pumps water to the injection nozzle And a water supply valve provided between the injection nozzle and the water supply means, and a valve control means for controlling the opening and closing operation of the water supply valve in conjunction with the operation of the hydraulic cylinder, the valve control means The water supply valve is opened when both crushing arms are closed by the hydraulic cylinder, and the water supply valve is closed when both crushing arms are opened by the hydraulic cylinder.

  According to the present invention, since the valve control means interlocks the advance / retreat operation of the hydraulic cylinder and the opening / closing operation of the water supply valve of the injection nozzle, the water injection from the injection nozzle is surely performed without forcing the operator to perform troublesome operations. It can be performed. And the water supply valve is opened by the valve control means when both crushing arms are closed, and is closed when both crushing arms are opened, and opens and closes at an accurate timing according to the opening and closing of both crushing arms. Water can be jetted only when dust scattering may occur, and the amount of water used can be drastically reduced. Moreover, since the spray nozzle is sprayed from the blade side of the crushing arm to the portion to be crushed, water can sufficiently penetrate into the cracks caused by the biting of the blade, ensuring a small amount of water and dust scattering. Can be prevented.

  In the crusher of this invention, it is preferable that the crushing arm is formed with a hole that opens at the cutting edge of the blade portion, and the injection nozzle is mounted in this hole. According to this, water from the injection nozzle will be injected from the blade edge of the blade portion, and water can be reliably infiltrated into the crack generated from the blade edge inside the portion to be crushed. Reduction of the amount of water and prevention of dust scattering can be achieved more reliably.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a demolition apparatus for a concrete structure W (see FIG. 2). This dismantling apparatus includes a crusher 3 connected to the tip of a boom 1 of a construction machine used as a machine body such as a power shovel via an arm portion 2. Then, the crusher 3 is moved to a position where the crushing portion of the concrete structure W is sandwiched by the movement of the boom 1 and the arm portion 2.

  The arm portion 2 includes a mounting base 21 for the boom 1, a first arm 22 pivotally attached to the mounting base 21 via a shaft 22a, and swinging with respect to the mounting base 21 by the operation of the hydraulic cylinder 22b. The second arm 23 is pivotally attached to the front end portion 22 via a shaft 23a and swings with respect to the first arm 22 by the operation of the hydraulic cylinder 23b.

  The crusher 3 is pivotally attached to the distal end portion of the second arm 23 via a shaft 31a, and an attachment frame 31 that swings relative to the second arm 23 by the operation of the hydraulic cylinder 31b. A support frame 32 that pivots by operation and a pair of crushing arms 33 and 33 connected to the support frame 32 are configured. Each crushing arm 33 is pivotally attached to the distal end portion of the support frame 32 via a shaft 33a at an intermediate portion thereof. As shown in FIG. 2, a hydraulic cylinder 34 is installed between the tail ends of the crushing arms 33 and 33, and the crushing arms 33 and 33 are opened and closed by the expansion and contraction of the hydraulic cylinder 34. . That is, when the hydraulic cylinder 34 is extended, both the crushing arms 33 and 33 are closed, and when the hydraulic cylinder 34 is shortened, both the crushing arms 33 and 33 are opened. As schematically shown in FIG. 3, the hydraulic cylinder 34 is connected to the hydraulic circuit 4 and is driven forward and backward by a hydraulic valve 41 for cylinder control. The hydraulic valve 41 is opened and closed by a hydraulic operation electromagnetic valve 42. The hydraulic operation electromagnetic valve 42 is energized and controlled so that both the crushing arms 33 and 33 are opened and closed by an operation of a control stick (not shown) by an operator. Done.

  As shown in FIGS. 1 and 2, the first blade portion 331 at the tip and the second blade portion 332 on the front side protrude from the inner surface facing the other crush arm of each crush arm 33. It is installed. Each crushing arm 33 is provided with an injection nozzle 35 that injects water from the first blade portion 331 toward the portion to be crushed of the concrete structure W.

  Each crushing arm 33 is formed with a hole 333 that opens to the cutting edge of the first blade portion 331, and an injection nozzle 35 is inserted into the hole 333. Thereby, the tip surface of the injection nozzle 35 forms a part of the blade edge of the first blade portion 331. The injection nozzle 35 is made of a material having a hardness equal to or higher than that of the first blade portion 331 so that the injection nozzle 35 is not damaged when the concrete structure W is crushed.

  As shown in FIG. 1, a water supply hose 37 disposed along the boom 1 and the arm portion 2 is connected to the injection nozzle 35. The portion near the downstream end of the water supply hose 37 is disposed along the outer surface of each crushing arm 33 by using a locking tool 37a so that the portion to be crushed does not hit this portion.

  As schematically shown in FIG. 3, a water supply means 38 including, for example, a water tank 38 a, a pump 38 b, and an accumulator 38 c is connected to the injection nozzle 35 via a water supply hose 37. A water supply electromagnetic valve 39 (water supply valve) is interposed in the water supply hose 37, and water from the water supply means 38 is pumped to the injection nozzle 35 by opening the water supply electromagnetic valve 39. The water supply electromagnetic valve 39 is opened and closed by energization control of the valve control means 5 such as a relay. The valve control means 5 interlocks the water supply electromagnetic valve 39 with the hydraulic operation electromagnetic valve 42, and when the hydraulic operation electromagnetic valve 42 extends the hydraulic cylinder 34 by the hydraulic valve 41, the water supply electromagnetic valve 39 is opened to perform injection. Water injection from the nozzle 35 is started. At this time, since the extension of the hydraulic cylinder 34 is a closing operation of both the crushing arms 33, 33, water injection from the injection nozzle 35 is started at the timing when the concrete structure W is crushed. When the hydraulic operation electromagnetic valve 42 shortens the hydraulic cylinder 34 by the hydraulic valve 41, the water supply electromagnetic valve 39 is closed to stop water injection from the injection nozzle 35. Since the shortening of the hydraulic cylinder 34 is an opening operation of the crushing arms 33, 33, the water injection from the injection nozzle 35 is stopped at the timing when the crushing arms 33, 33 release the sandwiching of the concrete structure W.

  Next, the operation of the crusher 3 will be described. When the crushing arms 33 and 33 are open as shown by solid lines in FIG. 2, when the operator performs an operation to close both the crushing arms 33 and 33, both the crushing arms are operated by the hydraulic operation electromagnetic valve 42 and the hydraulic valve 41. 33 and 33 are closed. At the same time, the valve control means 5 opens the water supply electromagnetic valve 39, and high-pressure water is injected from the injection nozzle 35.

  And the 1st and 2nd blade part 331,332 of each crushing arm 33 bites into the to-be-crushed part of the concrete structure W, a crack is produced inside the to-be-crushed part, and a to-be-crushed part weakens. Thereby, the part to be crushed is finally sandwiched between the crushing arms 33 and 33 and crushed. At this time, the first blade portion 331 bites deeper into the portion to be crushed than the second blade portion 332 and grows a crack in the portion to be crushed. Furthermore, in this embodiment, since water is injected from the 1st blade part 331 by the injection nozzle 35, water penetrate | infiltrates reliably to a crack. In particular, since the injection nozzle 35 is inserted into the hole 333 that opens to the blade edge of the first blade portion 331, water is sprayed from the blade edge of the first blade portion 331, and is generated starting from this blade edge. Water will surely penetrate into the crack. Therefore, it is possible to reliably moisten the dust generated inside the portion to be crushed as the crack grows. As a result, when the entire portion to be crushed is crushed, dust generated inside the portion to be crushed can be effectively prevented from flying up into the air and being scattered around.

  Thereafter, when the operator performs an operation of opening both the crushing arms 33 and 33, the crushing arms 33 and 33 are opened by the hydraulic operation electromagnetic valve 42 and the hydraulic valve 41. At the same time, the valve control means 5 closes the water supply electromagnetic valve 39 and the injection of water from the injection nozzle 35 is stopped.

  As described above, water is injected from the injection nozzle 35 only while both the crushing arms 33 and 33 are closed, that is, while the part to be crushed of the concrete structure W is crushed, so the amount of water used is reduced. Moreover, since the water from the injection nozzle 35 reliably moistens the cracks in the portion to be crushed, it is possible to reliably suppress dust scattering.

  In this embodiment, the injection nozzle 35 is mounted in the hole 333 so that the tip surface thereof forms part of the blade edge. However, even if the tip surface of the injection nozzle 35 is immersed in the hole 333, the first blade By injecting water from the cutting edge side of the portion 331, the same effect as described above can be obtained. However, in this case, the cutting edge of the first blade portion 331 is lost at the opening portion of the hole 333, which may adversely affect the crushing performance. On the other hand, in this embodiment, the portion of the cutting edge that has been lost due to the formation of the hole 333 can be filled with the injection nozzle 35, and the above-described problems do not occur.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, the crushing arm 33 may be provided with a second injection nozzle that injects water from the second blade portion 332 of the crushing arm 33 in addition to the injection nozzle 35 of the above embodiment. Furthermore, you may provide the water spray nozzle similar to the prior art example which pours water to a to-be-crushed part in the support frame 32 of the crusher 3. FIG. Also in these cases, it is preferable to control the water spray timing from the second spray nozzle and the water spray timing from the water spray nozzle in the same manner as the spray nozzle 35.

  In the present embodiment, the water supply means 38 is constituted by a water tank 38a, a pump 38b, an accumulator 38c, etc., and the output and size of the pump 38b can be reduced by accumulating the accumulator 38c. However, if a high pressure pump is employed as the pump 38b, the accumulator 38c may not be provided.

  Moreover, although the crushing machine 3 of the said embodiment is a both-arms movable type which a pair of crushing arms 33 and 33 operate | move together, one arm which one crushing arm is fixed and only the other crushing arm opens and closes. The present invention can be similarly applied to a movable crusher. Further, in a one-arm movable crusher, a blade portion may not be formed on a fixed crushing arm. In this case, an injection nozzle is provided only on the movable crushing arm.

  Moreover, in the said embodiment, although the crusher 3 connected with the front-end | tip of the boom 1 of a construction machine via the arm part 2 was shown, it is not restricted to this, Tower-like concrete, such as a chimney suspended by a crane The same effect can be obtained by applying the present invention to a crusher for crushing a structure.

The side view which shows the dismantling apparatus which comprises the crusher of embodiment of this invention. The expanded side view of the principal part of the crusher of embodiment. Explanatory drawing which shows the circuit for a drive of a hydraulic cylinder and an injection nozzle.

Explanation of symbols

  W ... Concrete structure, 3 ... Crushing machine, 33, 33 ... Crushing arm, 331 ... 1st blade part (blade part), 333 ... Hole, 34 ... Hydraulic cylinder, 35 ... Injection nozzle, 38 ... Water supply means, 39 ... water supply solenoid valve (water supply valve), 5 ... valve control means.

Claims (3)

Using a crusher with a pair of crushing arms that open and close, and having a blade portion formed on at least one crushing arm, the portion to be crushed of the concrete structure is sandwiched between both crushing arms and the blade portion is bitten into the portion to be crushed In the crushing method to crush,
An injection nozzle for injecting water from the blade side toward the portion to be crushed is provided,
When both crushing arms are closed and crushing of the part to be crushed is started, water injection from the injection nozzle is started, and when both crushing arms are opened, water injection from the injection nozzle is stopped. A method for crushing concrete structures. A pair of openable and closable crushing arms for crushing across the crushing part of the concrete structure, and a hydraulic cylinder for driving opening and closing of both crushing arms, and at least one crushing arm has a blade part that bites into the crushing part In the formed crusher,
An injection nozzle that injects water from the blade side toward the portion to be crushed;
Water supply means for pumping water to the spray nozzle;
A water supply valve provided between the spray nozzle and the water supply means;
Valve control means for controlling the opening and closing operation of the water supply valve in conjunction with the operation of the hydraulic cylinder,
The valve control means opens a water supply valve when both crushing arms are closed by a hydraulic cylinder, and closes the water supply valve when both crushing arms are opened by a hydraulic cylinder.   The crusher according to claim 2, wherein a hole that opens at a cutting edge of the blade portion is formed in the crushing arm, and the injection nozzle is mounted in the hole.

Images