JP4646138B2 - Existing concrete pipe crushing machine - Google Patents

Description

  The present invention relates to an existing concrete pipe crushing excavator equipped with a ring-shaped cutter head for crushing an existing concrete pipe used for drainage or sewer of rainwater buried in the ground and laying a new pipe.

Japanese Patent Laid-Open No. 7-98077 (conventional example 1) discloses an excavating section as an apparatus for crushing an existing concrete pipe buried in the ground without using an open-cut method and laying a new pipe. An existing concrete pipe renewal excavator is disclosed in which an existing concrete pipe is crushed by an excavator that has rotary excavating teeth disposed throughout, and then a new pipe is laid.
JP 7-98077 A

  However, the full-section excavator of Conventional Example 1 can cut the rebars of mild steel (SS400), but cannot cut the existing concrete pipe joints. It was necessary to put a worker and cut the joint ring into several equal parts. Moreover, when the length of the reinforcing bar cut by the cutter is long, the cut reinforcing bar is wound around the cutter, and the work is interrupted to remove it, which has the problem that the existing concrete pipe cannot be efficiently crushed. It was. Furthermore, in the case of a full-section excavator, the excavating teeth are arranged on the entire surface, so the weight is large and the rotational torque is large, and it is necessary to provide a high-output drive means, such as when a reinforcing bar is wound around the cutter. There was a problem that workers had to be removed from the opposite side of the existing concrete pipe.

  The present invention solves the problems of the conventional example. The existing concrete pipe crushing machine that can cut the joint ring, which is difficult to crush by the cutter head, enables auxiliary work machines or workers to enter and exit the existing concrete pipe, and crushes the existing concrete pipe efficiently. The purpose is to provide.

In order to solve the above problems, the existing concrete pipe crushing excavator of the present invention has an opening at the center of a roller bit that is rotatably attached to a mounting shaft extending in the radial direction. A ring-shaped cutter head that is arranged in a plurality of rings so as to be formed and is rotationally driven by a driving means, the ring-shaped cutter head is disposed in a mountain-cylinder cylindrical portion provided with a slit cutter at the tip, and the plurality of roller bits The mounting shaft is mounted such that the end on the inner diameter side is positioned on the rotational direction side and is inclined in the circumferential direction .

Further, the existing concrete pipe crushing excavator of the present invention is a plurality of existing concrete pipe crushing excavators, in which a plurality of roller bits, which are rotatably attached to a mounting shaft extending in the radial direction, are formed at the center. A ring-shaped cutter head that is arranged in a ring shape and is rotationally driven by a driving means, and the plurality of roller bit mounting shafts are inclined in the axial direction, with the end on the inner diameter side positioned on the rear side in the axial direction, and the plurality The roller bit mounting shaft is mounted such that the end on the inner diameter side is located on the rotational direction side and is inclined in the circumferential direction.

Further, the existing concrete pipe crushing excavator of the present invention is configured such that the ring-shaped cutter head can be rotated forward and reverse by a driving means, and the end portion on the inner diameter side of the mounting shaft of the roller bit has a pin structure, and the end on the outer peripheral side. The portion is attached to a circumferential bearing that is slidable by a predetermined angle in the circumferential direction, and the inclination angle in the circumferential direction of the roller bit attachment shaft can be changed in accordance with the change in the rotation direction of the ring-shaped cutter head.

In addition, the existing concrete pipe crushing excavator of the present invention is capable of connecting or disconnecting the driving means of the ring-shaped cutter head and the mountain stopper cylindrical portion, and rotating or non-rotating the mountain retaining cylindrical portion. Features.

Moreover, the existing concrete pipe crushing excavator of the present invention is characterized in that the mountain stopper cylindrical portion can be expanded and contracted in the excavation direction with respect to the ring-shaped cutter head.

By attaching multiple roller bit mounting shafts so that the inner diameter end is positioned in the rotational direction and inclined in the circumferential direction, the rebars and joints crushed and cut by the roller bit of the ring-shaped cutter head The action to be taken in is increased, and crushing / removal of cut objects / transport work becomes easier.
The plurality of roller bit mounting shafts have an inner diameter end positioned on the rear side in the axial direction and inclined in the axial direction, and the plurality of roller bits mounting shafts are positioned on the inner diameter side end on the rotation direction side. The structure that is inclined and mounted in the circumferential direction increases the action of taking in the inner diameter direction of rebars and joints that have been crushed and cut by the roller bit of the ring-shaped cutter head, making it easier to crush and remove and transport the cut material. become.
The ring-shaped cutter head can be rotated forward and backward by driving means, the inner end of the roller bit mounting shaft has a pin structure, and the outer end is attached to a bearing that can slide a predetermined angle in the circumferential direction. If the rotation direction of the ring-shaped cutter head is constant, the excavator may roll if the rotation angle of the circumferential direction of the roller bit mounting shaft can be changed according to the change of the rotation direction of the cylindrical cutter head. Therefore, every time the vehicle advances a predetermined distance, the rotation direction of the ring-shaped cutter head can be changed to prevent the excavator from rolling. At that time, by changing the inclination angle of the roller bit in the circumferential direction by the resistance force accompanying the rotation in the ring cutter direction, the action of taking in the crushed and cut reinforcing bars and joints in the inner diameter direction even if the rotation direction changes Can be sustained.
When the driving means of the ring-shaped cutter head and the mountain retaining cylindrical portion can be connected or disconnected and the mountain retaining cylindrical portion is rotated or non-rotated, when the N value of the ground to be dug is low, the mountain retaining cylindrical portion When the N value of the ground to be excavated is normal or large, the ground stop can be rotated to efficiently excavate the natural ground.
With the configuration that allows the mountain retaining cylindrical part to be expanded and contracted with respect to the ring-shaped cutter head, the protruding length of the mountain retaining cylindrical part to the ground can be adjusted according to the surrounding ground conditions, and the surrounding ground is stable The existing concrete pipe can be crushed by the ring cutter head.
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  Embodiments of the present invention will be described with reference to the drawings. 1 and 2 are views showing a first embodiment of an existing concrete pipe crushing excavator according to the present invention.

  The existing concrete pipe crushing machine has an inner diameter larger than the outer diameter of the existing concrete pipe 2 buried in the ground, and only the part necessary for crushing the existing concrete pipe 2 is provided at the front of the excavator body. A cutter is provided, and a ring-shaped cutter head 4 having an opening 5 at the center is provided. The ring-shaped cutter head 4 includes a face plate 6 having a large opening 5 in the center where a worker, material, work machine, and crushed material can be taken in and out. A straight type roller bit 7 is provided in the face plate 6 at predetermined intervals. Are attached to a mounting shaft 13 extending in the radial direction in a freely rotatable manner.

  A bulkhead (not shown) having an opening at the center is disposed at the rear of the ring-shaped cutter head 4. The drive means 11 provided with the deceleration mechanism which rotationally drives the ring-shaped cutter head 4 is arrange | positioned at a bulk head. The ring-shaped cutter head 4 is disposed at the tip in a mountain stop cylindrical portion 8 provided with a slit cutter 9 made of cemented carbide. The mountain-clamping cylindrical portion 8 is protruded forward from the arrangement position of the ring-shaped cutter head 4 so that earth and sand from the natural ground does not enter the excavator main body.

  In the first embodiment of the present invention, the driving means 11 for driving the ring-shaped cutter head 4 and the mountain retaining cylindrical portion 8 are connected, and the ring-shaped cutter head 4 and the mountain retaining cylindrical portion 8 are simultaneously rotated in the same direction.

  As shown in FIG. 2, the ring-shaped cutter head 4 of the existing concrete pipe crushing excavator according to the first embodiment of the present invention is configured such that the end on the inner diameter side of the mounting shaft 13 of the roller bit 7 is the rear side in the axial direction. The plurality of roller bits 7 are arranged in a truncated cone shape by being inclined at a predetermined angle β ° with respect to the radial vertical line. The axial inclination angle β ° is 3 to 45 °. When the axial inclination angle β ° of the mounting shaft 13 of the roller bit 7 is 3 ° or less, that is, an angle close to the vertical line in the radial direction, the reinforcing bars and the joints crushed and cut by the roller bit 7 are pushed into the ground. And cannot be recovered and removed. When the inclination angle β ° of the mounting shaft 13 in the axial direction of the roller bit 7 is 45 ° or more, the crushing / cutting force of the roller bit 7 is reduced. With the above-described configuration, the cut and crushed material is taken into the inner diameter side without reducing the crushing / cutting ability of the roller bit 7, thereby facilitating the removal / transport operation. Even when the joint ring cannot be cut short, it is taken into the inner diameter side, so that it is possible to easily carry in an operator and a work machine from the opening 5 and cut it to a length that can be transported and removed.

  FIG. 3 is a diagram showing a second embodiment of the present invention. The ring-shaped cutter head 4 of the existing concrete pipe crushing excavator of the second embodiment is arranged so that the circumferential position of the inner diameter side end of the mounting shaft 13 of the roller bit 7 is shifted to the rotational direction side, and the radius Arranged at an angle of α ° with respect to the direction. The inclination angle α ° in the radial direction is 3 to 45 °. When the inclination angle α ° in the radial direction is 3 ° or less, that is, when the inclination angle in the radial direction becomes an angle close to the radius, the rebars and joints crushed and cut by the roller bit 7 are pushed into the ground, It cannot be recovered and removed. When the inclination angle α ° of the mounting shaft 13 in the radial direction of the roller bit 7 is 45 ° or more, the crushing / cutting force of the roller bit 7 is reduced. With the above-described configuration, the cut and crushed material is taken into the inner diameter side without reducing the crushing / cutting ability of the roller bit 7, thereby facilitating the removal / transport operation. Even when the joint ring is short and cannot be cut, it is taken into the inner diameter side, so that it is possible to easily carry in an operator and a work machine from the opening 5 and cut it to a length that can be conveyed and removed.

The third embodiment of the present invention is a combination of the first and second embodiments of the present invention.
That is, the ring-shaped cutter head 4 of the existing concrete pipe crushing excavator according to the third embodiment of the present invention positions the end portion on the inner diameter side of the mounting shaft 13 of the roller bit 7 on the rear side in the axial direction. Is inclined at a predetermined angle β °, and the circumferential position of the inner diameter side end of the mounting shaft 13 of the roller bit 7 is shifted to the rotational direction side, and is inclined by α ° with respect to the radial direction. Let them be arranged. With the configuration of the third embodiment of the present invention, the cut and crushed material is taken into the inner diameter side and removed without reducing the crushing and cutting ability of the roller bit 7. Makes the transportation work easier.

FIG. 4 shows a fourth embodiment of the present invention. The existing concrete tube crushing excavator of the fourth embodiment is applied to a roller bit 7 attachment shaft 13 of the second and third embodiments inclined in the circumferential direction. This is because when the ring cutter head 4 is rotated only in the same direction and the excavation is continued, the excavator itself rolls and the excavation direction may be shifted. Therefore, the rotation direction of the ring cutter head 4 is set to a predetermined distance. It is necessary to change every digging. However, if the direction of rotation of the ring-shaped cutter head 4 changes, if the direction of the inclination angle α ° in the radial direction of the roller bit 7 remains the same, the action of pushing the cut and crushed material toward the ground will increase, and the cutting and crushing will occur. There arises a problem that it becomes difficult to remove and transport objects. Therefore, in the fourth embodiment of the present invention, the end portion on the inner diameter side of the roller bit 7 has a pin structure, and the end portion on the outer periphery side is attached to a circumferential bearing that can slide by a predetermined angle in the circumferential direction. The end of the mounting shaft 13 on the outer peripheral side is slid in the circumferential direction along the circumferential bearing, and the circumferential inclination angle of the roller bit 7 is changed by the resistance force accompanying the change in the rotation direction. At each end of the circumferential bearing, a groove or the like for locking the outer end of the mounting shaft 13 is provided. With the configuration described above, rolling of the excavator can be prevented, and the action of taking the cut / crushed material in the inner diameter direction can be maintained even if the rotation direction of the ring-shaped cutter head 4 is changed.

  When an existing concrete pipe crushing machine is used to crush an existing concrete pipe 2 buried underground and lay a new pipe, hard ground and soft ground are often mixed. In soft ground with a low N value and no self-supporting surname, the ground taken in the mountain retaining cylinder 8 will collapse when the mountain retaining cylinder 8 rotates, and the ground will not be stable at the angle of repose and will disturb the ground. . In such soft ground, it is more stable if the mountain retaining cylindrical portion 8 is non-rotated and penetrates into the natural ground. On the other hand, in a hard ground or a cobblestone ground having a high N value of the ground, it is necessary to dig by rotating the mountain stop cylindrical portion 8 provided with a slit cutter 9 made of cemented carbide at the tip. Therefore, the fifth embodiment of the present invention employs a configuration as shown in FIG.

  As shown in FIG. 5, a support ring 56 that supports the mountain-clamping cylindrical portion 8 is attached to the outer peripheral tip of the driving means 11 that drives the ring-shaped cutter head 4. A ball bearing 54 is disposed between the mountain stop cylindrical portion 8 and the support ring 56 so as to be rotatable, and seals 53 for preventing soil and sand from entering the ball bearing 54 are attached to both ends. The rear portion of the face plate 6 to which the ring-shaped cutter head 4 is attached is fixed to the driving means 11 by the mounting bolt 58, and the ring-shaped cutter head 4 is rotationally driven. A bracket 59 extending in the inner diameter direction is formed at an arrangement position of the ring-shaped cutter 4 of the mountain stop cylindrical portion 8, and a hole for inserting the rotation transmission pin 55 is formed in the bracket 59. On the other hand, a hole for inserting the rotation transmission pin 55 is also formed in the face plate 6 of the ring-shaped cutter head 4. When rotating the mountain retaining cylindrical portion 8, the rotation transmitting pin 55 is inserted into holes formed in the face plate 6 and the bracket 59 by remote control by means of manual or hydraulic jacks, etc. The driving force is transmitted to the mountain-clamping cylindrical portion 8. When the mountain-clamping cylindrical portion 8 is not rotated, the rotation transmitting pin 55 is pulled out by a manual operation or a remote operation by means such as a hydraulic jack from holes formed in the face plate 6 and the bracket 59, respectively. According to the above configuration, the mountain retaining cylindrical portion 8 can be rotated or non-rotated according to the ground state to be excavated, and the excavated ground can be stably excavated even if the state of the excavated ground fluctuates.

  FIG. 6 shows a sixth embodiment of the present invention. In the sixth embodiment of the present invention, the rotation / non-rotation mechanism of the mountain stop cylindrical portion 8 of the fifth embodiment is continued, and depending on the state of the surrounding ground 57, in the soft ground having a low N value without self-supporting, Stabilize the natural ground by making the mountain stop cylindrical portion 8 non-rotating and increasing the protrusion length of the mountain stop cylindrical portion 8 in the digging direction with respect to the ring-shaped cutter head 4 and increasing the penetration length into the natural ground. Let In the hard ground or cobblestone ground with a high N value of the ground, the projecting length in the digging direction with respect to the ring-shaped cutter head 4 of the mountain stop cylindrical portion 8 is shortened, and a slit cutter 9 made of cemented carbide is provided at the tip. The mountain stop cylinder portion 8 is rotated to stabilize the excavation ground and excavate.

  As shown in FIG. 6, a support ring 56 that supports a mountain-clamping cylindrical portion support ring 65 is attached to the outer peripheral tip of the driving means 11 that drives the ring-shaped cutter head 4. A ball bearing 54 is disposed between the mountain retaining cylindrical portion support ring 65 and the support ring 56 so as to be rotatable, and seals 53 for preventing intrusion of earth and sand into the ball bearing 54 are attached to both ends. The mountain retaining cylindrical portion 8 is slidably disposed on the outer periphery of the distal end portion of the mountain retaining cylindrical portion supporting ring 65. A plurality of elongated holes 62 extending in the axial direction are formed at the tip of the mountain retaining cylindrical portion support ring 65, and a plurality of screw nuts 63 fixed to the inner periphery of the mountain retaining cylindrical portion 8 in the plurality of elongated holes 62 are provided. Position it slidably. A screw jack 64, one end of which is fixed to the mountain retaining cylindrical portion support ring 65, is screwed to the screw nut 63, and the cap 60 disposed in the work hole formed in the face plate 6 is removed, and the hexagon head 61 is inserted through a tool or the like. , The screw nut 63 is moved forward and backward, and the mountain retaining cylindrical portion 8 is expanded and contracted with respect to the ring-shaped cutter head 4 in the digging direction. Driving means such as a hydraulic jack may be used to move the mountain stop cylindrical portion 8 back and forth in the digging direction. When rotating the mountain retaining cylindrical portion 8, the rotation transmitting pin 55 is inserted into the holes formed in the face plate 6 and the mountain retaining cylindrical portion supporting ring 65 by manual or remote operation by means such as a hydraulic jack and driven. The force is transmitted to the mountain stop cylindrical portion 8. When the mountain retaining cylindrical portion 8 is not rotated, the rotation transmitting pin 55 is pulled out manually or remotely by means such as a hydraulic jack from holes formed in the face plate 6 and the mountain retaining cylindrical portion supporting ring 65, respectively. According to the above configuration, the mountain retaining cylindrical portion 8 can be rotated or non-rotated according to the ground state to be excavated, and the excavated ground can be stably excavated even if the state of the excavated ground fluctuates.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

Explanation of symbols

2: Existing concrete pipe, 4: Ring-shaped cutter head, 5: Center opening, 6: Face plate, 7: Roller bit, 8: Cylindrical cylindrical portion, 9: Slit cutter, 11: Driving means, 13: Mounting shaft 53: seal, 54: ball bearing, 55: rotation transmission pin, 56: support ring, 57: ground, 58: mounting bolt, 59: bracket, 60: cap,
61: Hexagon head, 62: Long hole, 63: Screw nut, 64: Screw jack, 65: Cylindrical cylindrical support ring

Claims (5)

  In an existing concrete pipe crushing excavator, a ring-shaped cutter in which a plurality of roller bits rotatably mounted on a radially extending mounting shaft are arranged in a ring shape so that an opening is formed in the center and is rotated by a driving means. The ring-shaped cutter head is disposed in a mountain-cylinder cylindrical portion provided with a slit cutter at the tip, and the attachment shafts of the plurality of roller bits are positioned on the rotational direction side and inclined in the circumferential direction. An excavator for crushing existing concrete pipes, characterized in that   In an existing concrete pipe crushing excavator, a ring-shaped cutter in which a plurality of roller bits rotatably mounted on a radially extending mounting shaft are arranged in a ring shape so that an opening is formed in the center and is rotated by a driving means. The head has a plurality of roller bit mounting shafts with an inner diameter end positioned on the rear side in the axial direction and inclined in the axial direction, and the plurality of roller bit mounting shafts rotated on the inner diameter side end. An existing concrete pipe crushing excavator characterized by being attached to the direction side and inclined in the circumferential direction. The ring-shaped cutter head can be rotated forward and backward by driving means, the inner end of the roller bit mounting shaft has a pin structure, and the outer end is a circumferential bearing that can slide a predetermined angle in the circumferential direction. The existing concrete pipe crushing excavator according to claim 1 or 2 , characterized in that the inclination angle of the mounting shaft of the roller bit in the circumferential direction can be changed in accordance with the change in the rotation direction of the attachment and ring cutter head. .   The driving means of the ring-shaped cutter head and the mountain retaining cylindrical portion can be connected or disconnected, and the mountain retaining cylindrical portion is rotated or non-rotated. Existing concrete pipe crushing machine. The existing concrete pipe crushing excavator according to any one of claims 1 to 4 , wherein the mountain stopper cylindrical portion is extendable and contractible in the excavation direction with respect to the ring-shaped cutter head.

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