JP2013053483A - Low-height excavating machine capable of changing feed stroke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device which increases a machine operation rate by enhancing excavation efficiency on a job site with allowance for height by enabling additional extension of a mast.SOLUTION: A low-height excavating machine includes: a skid base; a frame which is supported by the skid base and which relatively slides in its longitudinal direction; a mast 3 which is provided with a roller chain 11 erected in the frame; a lifting device which is fitted with a swivel head 5 lifted/lowered by a pin sprocket meshed with the roller chain 11; and a turn table 30 which rotates a kelly rod. In the low-height excavating machine, an extension mast provided with the roller chain 11 is detachably attached to the mast, the total height of the mast is increased, and a feed stroke can be set long to enhance excavation efficiency.

Description

  The present invention is such that the feed stroke can be changed by extending the frame of the drilling device used in a site where the sky head is restricted, such as under a station platform. The present invention relates to a drilling device that can increase the drilling efficiency by increasing the feed stroke.

When a platform is added to a railway station building that is in operation or a station building is expanded or renovated, foundation works and earthwork will not be a hindrance to railway sales. It must be carried out at night, and since there is an overhead line that supplies electric power for trains on the rail, it is necessary to prevent the construction machine from coming into contact by any chance. There is a problem that it takes a work period. The foundation to be newly constructed is constructed between the tracks and under the platform, but it is necessary to prevent the construction machine from becoming an obstacle for the passengers during the construction.
To solve such problems, as shown in FIG. 1, the skid base can be moved in the horizontal direction, and the kerry rod is rotationally driven by a frame, a mast, and a turntable provided on the base. By doing so, we proposed a low-head drilling rig that can be installed even with a head of 2 m or less.

JP 2007-39921 A

However, because it is a low-heading excavator, even if there is room in the head, the feed stroke of the kelly rod, which is a drilling pipe, is limited by the height of the frame, and the drilling pipe is frequently added. Since the excavation efficiency must be low, there is a problem that the excavation efficiency is low for use on a site with a surplus space, and the use rate of the excavator is low because the available sites are limited.
The present invention enables the frame to be extended at a site with a surplus head, increasing excavation efficiency, and increasing the operating rate of the apparatus.

  A skid base is slidably provided at the lower part of the frame, the frame and the skid base are connected by a cylinder jack, and a leveling jack that is independently driven is provided at the lower part of the frame. The mast has a roller chain fixed to the frame. And a turntable that rotates the excavation bit is provided at the center, and a hydraulic motor that drives the turntable is provided outside the turntable. The pin meshes with a fixed roller chain provided on the mast. A swivel head is attached to an elevating device having a gear sprocket, and further, the excavator is for low head including a removable extension mast that can be connected to an upper portion of a mast and has a roller chain fixed thereto.

  The excavator of the present invention is a turntable method for driving the excavating rod, and an extension mast can be additionally installed on the upper part of the mast provided on the frame. In addition, an extension mast can be provided at a site where there is room in the sky to increase excavation efficiency and increase the operating rate of the excavator.

The top view of a low head drilling rig. The side view of a low head drilling rig. The front view of a low head drilling rig. The perspective view of a kelly rod. The side view of the low sky head excavation equipment which attached the extension mast. The front view of the low head drilling rig which attached the extension mast.

The low-head drilling device of the present invention will be described with reference to the accompanying drawings. As shown in FIGS. 1 to 3, the excavator can be operated even at a site where the sky head is extremely limited to about 2 m, and the height of the excavator is about 1.8 m.
The excavator includes a skid base 1, a frame 2, a mast 3, an elevating device 4, and a turntable 30. The skid base 1 is a frame body in which a pair of skids 1a and 1a are connected by a connecting member 1b, and the frame 2 is slidably mounted on the skids 1a and 1a of the skid base 1 via a guide 6. The skid base 1 contacts the ground surface. A hydraulic cylinder 7 is arranged between the connecting member 1b at the rear part of the skid base 1 and the frame 2 so that the frame 2 can slide relative to the skid base 1 by its expansion and contraction operation.

Leveling jacks 8, 8 that can be driven independently are provided on both sides of the frame 2 in the front-rear direction. By operating the leveling jack 8, the frame 2 can be lifted from the grounding surface together with the skid base 1. . By driving the leveling jack 8 independently, one of the skids 1a can be lifted from the ground surface alone, and can be advanced in an oblique direction.
By operating all the leveling jacks 8 to lift the skid base 1 from the ground surface and operating the hydraulic cylinder 7 to expand and contract, the excavator can be moved forward and backward like a scale insect.

The frame 2 is provided with a base plate 9, and the mast 3 is erected on the base plate 9. As shown in FIG. 3, the mast 3 is a frame body, and a pair of guides 10, 10 extending in the vertical direction for guiding the lifting device 4 are provided at the front part thereof. A roller chain 11 is installed along the guides 10 and 10, and a pair of pin gear sprockets 12 and 12 are accommodated in the lifting device 4 corresponding to the roller chain 11, and are lifted and lowered along the roller chain 11. The device 4 moves up and down.
The lifting device is provided with a hydraulic motor 13, and the sprockets 12, 12 are rotated by the hydraulic motor 13 and moved up and down along the roller chains 11, 11. The mast 3 is provided with a stopper 20a that defines the rising limit position and the falling limit position of the lifting device 4.
The fixed roller chain and pin gear sprocket lifting device does not require high assembly accuracy compared to the rack and pinion method, is advantageous in terms of cost, and is free from rattling due to wear of the lifting slide surface. Since it can respond flexibly, maintenance and repair are easy, and costs can be reduced.

  The swivel head 5 is attached to the lifting device 4 via a bracket 14, and a kelly rod 15 shown in FIG. 4 is connected via a flange 16. A sludge pipe 17 is connected to the swivel head 5.

  As shown in FIG. 4, the kelly rod 15 has a rotational driving force transmission projection 41 formed by welding a steel material such as channel steel on both side surfaces of the tubular body. Flange 43 is provided at both ends of the tube, and reinforcing ribs 42 are provided on the lower surface of flange 43. One flange is provided with long and short guides 44 for connecting the kelly rods to each other for easy alignment. The other flange 43 has a corresponding alignment hole at the corresponding position. Is formed.

  The kelly rod 4 is connected by a bolt 46, and a bolt is attached to one flange by an auxiliary tool in advance, facilitating connection work in a narrow space. The other flange 43 has a connection hole at a corresponding position. A metal fitting 47 for hooking a hook of a crane when handling the kelly rod 4 is provided on the side surface of the tube body.

  Arms 23 and 23 are provided on both sides of the mast 3 for suspending the kelly rod 15 when the kelly rod 15 is added or detached. The arms 23 and 23 are attached to the mast 3 via hinges 24 and can be swung in a horizontal plane. A winch 25 is provided at the rear ends of the arms 23 and 23. A pulley 26 is provided at the tip of the arms 23, 23. A hook 27 a is provided at the tip of the wire rope 27 that is drawn out from the winch 25 and is hung on the pulley 26 and hangs down. A bracket 47 for being hooked on the hook 27 a is provided on the peripheral surface of the kelly rod 15.

  The turntable 30 is installed on the frame 2. The turntable 30 has a support frame 31 that rotatably supports the turntable 30. A drive transmission mechanism for the turntable 30 is disposed inside the support frame 31, and a ring gear formed on the outer periphery of the turntable 30, an idle gear that meshes with the ring gear, and a pinion that meshes with the idle gear are disposed. ing. The pinion is a gear attached to a hydraulic drive motor 32 installed on the support frame 31, and the turntable 30 is rotated by the operation of the drive motor 32.

  A bush is detachably attached to the inner periphery of the turntable 30, and a groove for fitting the projection 41 of the kelly rod 15 is provided on the inner peripheral surface of the bush. The bit attached to the tip of the kelly rod 15 rotates and excavation is performed.

  When the swivel head 5 reaches the lowered position shown by the two-dot chain line in FIG. 2, a new kelly rod 15 is added. First, the connection between the swivel head 5 and the kelly rod 15 is released and raised to the upper part of the mast 3, and the mast 3 is moved backward to add a new kelly rod 15. Next, the mast 3 is advanced to connect the swivel head 5 and the new kelly rod 15. In the low head space, since the height of the mast 3 is made as low as possible, the feed stroke is small and excavation efficiency is sacrificed.

In order to solve this problem, an extended mast 3 a having a height of about one half of the mast 3 can be detachably connected to the upper portion of the mast 3.
As shown in FIGS. 5 and 6, the extension mast 3a has a frame structure similar to that of the mast 3, and a pair of guides extending in the vertical direction for guiding the lifting device 4 are provided on the front side. The roller chain 11 is arranged at the same interval as the roller chain 11 provided on the mast 3, and the roller chain 11 after the extension mast 3a is connected is a straight line.
The stopper 20a provided on the mast 3 is removed and installed on the extended mast 3a.
As described above, the lifting device 4 having the roller chain 11 and the pin gear sprocket 12 does not require high assembly accuracy as compared with other methods, and is easy to assemble, and the mast 3 and the extended mast 3a are slightly deformed. Even if there is, there is not much influence on the lifting operation of the lifting device 4, which is convenient.

The extension mast 3a is provided with a connection plate having a connection hole at the bottom, and a connection hole is similarly provided at the top of the mast 3 and connected by a connecting tool such as a bolt and a nut.
When the height of the excavator is about 1.8 m, the feed stroke f1 can only be about 1.1 m, but by connecting an extension mast with a height of 1 m, the feed stroke is f1 + f2 as shown in FIG. Therefore, when the number of times of adding and replacing the kelly rod 15 is excavated to the same depth, the number of excavation efficiency can be drastically increased.

1: skid base 2: frame 3: mast 3a: extension mast 4: lifting device 5: swivel head 7: drive cylinder 8: leveling jack 10: guide 11: roller chain 12: pin sprocket 13: drive motor 15: kelly rod 23 : Arm 25: Winch 26: Pulley 27: Wire rope 30: Turntable 31: Support frame 32: Drive motor 41: Projection

Claims (1)

  A skid base is slidably provided at the lower part of the frame, the frame and the skid base are connected by a cylinder jack, and a leveling jack that is independently driven is provided at the lower part of the frame. The mast has a roller chain fixed to the frame. And a turntable that rotates the excavation bit is provided at the center, and a hydraulic motor that drives the turntable is provided outside the turntable. The pin meshes with a fixed roller chain provided on the mast. A low-head excavation device comprising a removable extension mast to which a swivel head is attached to a lifting device having a gear sprocket and which can be connected to an upper portion of the mast and to which a roller chain is fixed.

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