JP2759512B2 - Drive device for casing tube - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a drive device for a casing tube of a self-propelled drilling machine used for cast-in-place of a concrete pile.

[Conventional technology]

Conventionally, several arc-shaped segments holding a casing tube are connected in a chain shape, and a clamp unit in which segments at both ends thereof are connected by a hydraulic cylinder, and a ring gear for driving the clamp unit can be rotated only freely. A drive device for a casing tube of a self-propelled drilling machine including a lifting frame provided with a plurality of ring gear driving devices supported and symmetrically disposed, and a lifting drive device for the lifting frame, is disclosed in These are known from JP-A-108487 and JP-A-63-251520.

An invention in which a split liner to which a rack gear is fixed is rotatably supported in the clamp unit is also disclosed in JP-A-59-55.
No. 988.

[Problems to be solved by the invention]

In the former described in the prior art, since the clamp unit or its operating mechanism is provided either above or below the lifting frame, the height of the ground frame of the lifting frame with the clamp unit lowered at the lowest is at least about 2.5 m. When placing concrete in a casing tube by a concrete mixer truck after drilling, the climbing platform on which the concrete mixer climbs must be installed on the ground, making it impossible to perform construction in narrow work sites. However, there is a risk that a safety problem may occur when the concrete mixer truck is carried in due to the use of the climbing platform.

If you try to apply the latter invention to avoid this,
Since each segment forming the clamp unit holds and tightens the casing tube via the bearing and the split liner in order, the rigidity or the radial thickness of both the segment and the split liner must be increased. The outer diameter of the clamp unit is larger than the outer diameter of the tube. For this reason, in a self-propelled drilling machine having a large-diameter casing tube driving device in which a plurality of rack gear driving devices must be provided, it is difficult to transport the drilling machine on the road. In addition, it is inevitable that there is a certain tolerance in the outer diameter and roundness of the casing tube, and since each segment is divided into upper and lower parts by rack gears, the meshing of the drive side gears with the rack gears. When it is easy to get out of order and it is necessary to provide a plurality of rack gear driving devices, friction loss due to gear transmission increases significantly, and gear wear and breakage increase.

The present invention reduces the ground height of the lifting frame with the clamp unit at the lowest position so that ready-mixed concrete can be poured by a concrete mixer truck on the ground into the casing tube pushed in at the time of drilling. It is an object of the present invention to make a self-propelled drilling machine equipped with a drive device compact so that it can be transported on a road, and to perform brain death due to friction loss of gear transmission, loss of gear, and the like.

Means for Solving the Problems In order to achieve the above object, the present invention provides a flange forming portion projecting radially outwardly above and below a rigid ring forming portion forming each segment of the clamp unit. Thus, a ring gear having a non-gear portion between upper and lower flange forming portions of all the segments is always held so as to be relatively slidable along upper and lower end surfaces thereof, and a casing tube tightly held and clamped by a clamp unit and a ring gear. In order to be concentric, the upper and lower flange forming portions of the intermediate segment are fixed to the ring gear, and outside the non-gear portion of the split ring gear,
An outer ring member of a ball bearing having this as an inner ring member is provided, and the outer ring member is integrally fixed to an outer peripheral wall plate of a lifting frame having an inverted L-shaped cross section.

In a self-propelled boring machine in which the upper and lower driving devices and the outriggers respectively disposed on both sides are attached to the support frame in front of the chassis, it is preferable that the support frame is formed in a flat U-shape that opens in front of the chassis.

[Action]

Since the present invention has the above configuration, if the two ends of the casing unit are pulled by the hydraulic cylinder of the clamp unit into which the casing tube is loosely inserted, the intermediate segment is fixed to the ring gear and the center of the clamp unit is positioned. In addition, the upper and lower flange forming portions of the other segments slide along the upper and lower end surfaces of the ring gear, whereby the clamp unit holds and tightens the casing tube concentrically with the ring gear.

Further, the output of the lifting / lowering drive device acting on the ring gear which is rotatably supported on the outer peripheral wall plate of the lifting frame via a ball bearing via a ball bearing is a flange forming portion of all segments which engages with either the upper or lower end face of the ring gear. , And the ring gear rotational force of each ring gear driving device is transmitted to the clamp unit via the intermediate segment fixed to the ring gear, so that the casing tube is rotated while rotating. It can be pushed or pulled out into the ground.

In addition, since the clamp unit is housed in the lift frame having an inverted L-shaped cross section, the height of the lift frame near the lowest position is extremely low, and the clamp unit is placed in the casing tube pushed into the ground during drilling. When pouring concrete, it can be poured by gravity action from a concrete mixer truck on the ground.

Also, there is no danger that the ring gear and its drive side gear mesh with each other due to the tolerance of the outer diameter and roundness of the casing tube, and the radial thickness of the drive unit must be increased in order to increase the rigidity. Since only the ring forming portion of each segment is lost, there is no danger that the width of the drive device will increase as compared with the diameter of the casing tube.

In the case of a self-propelled drilling machine in which the upper and lower ends of a lifting drive device and a pair of outriggers respectively provided on both sides are respectively mounted on support flumes in front of the chassis, the support frame may be formed in a flat U-shape that opens in front of the chassis. In this case, since the fresh concrete gravity injection gutter of the concrete mixer truck can be turned up and down in the opening of the support frame, it is easy to introduce the concrete mixer truck into the drive device of the casing tube.

〔Example〕

The drawing shows an embodiment of the present invention. Each of the segments 1a, 1b, 1c, 1d, 1e of the clamp unit 1 has a pair of upper and lower hydraulic pressures at a pin connecting portion 11 between adjacent segments and at both end segments 1a, 1e. It has the same configuration except for a pin connecting portion 13 for connecting both ends of the cylinder 12 respectively. As shown in FIG. 5, the ring forming part (a) of each segment is composed of vertical inner and outer circular plates 14,15.
Four horizontal plates 16, 17, 18, and 19 are welded together between them,
Upper horizontal plates 16 and 17 have thick upper collar forming parts (b),
Further, a lower flange forming portion (c) is welded to the lower horizontal plate 19, respectively. The upper collar forming part (b) is divided into two horizontal plates 16, 17
This is because the force required to pull out the underground casing tube is significantly greater than the pushing force of the casing tube.

The ring forming portion (a) and the upper and lower flange forming portions (b) and (c) of all the segments form concentric rings and flanges respectively when the casing tube is held and tightened, and between the upper and lower flanges. The rigid cylindrical ring gear 5, which is held relatively slidably, is rotatably supported by the outer ring member 7a of the ball bearing 7 with the lower non-gear portion 5a as an inner ring member. 4
As shown in the figure, the outer peripheral wall plate of the lifting frame 3 having an inverted L-shaped cross section
It is fixed to the lower end of 3a with many bolts 20. It is preferable that the reinforcing ring portion 3b on the inner periphery of the lifting frame 3 is substantially slidably in contact with the horizontal plate 16 at the upper end of each segment.

Upper and lower collar forming parts of middle segment 1c (b), (c)
Is fixed to the ring gear 5 by a number of through bolts 21 as shown in FIG. Reference numeral 22 denotes a pedestal mounted on the lower side of the outer ring member 7a. On the pedestal 22, a rotary joint (rotary seal) 23 provided in the middle of an oil passage for supplying and discharging hydraulic pressure to and from the clamp unit operating hydraulic cylinder 12. Are mounted concentrically with the ring gear 5, and the inner rotating ring 24 of the swivel joint 23 is rotated by the intermediate segment so as to rotate synchronously with the clamp unit 1.
Linked to 1c. As shown in FIGS. 1 and 2, the ring gear driving device 2 operatively connects output gears 26 of hydraulic motors 25 attached to the four corners of the square lifting frame 3 to the ring gear 5 via intermediate gears 27, respectively. It becomes.

As shown in FIG. 3, the self-propelled drilling machine has a flat U-shaped support frame 9 which is opened forward at the front end of a chassis 10 provided with a crawler traveling device 28, and can be raised and lowered on the base of the support frame. A hammer glove 31 piercing the casing tube 6 inserted in advance is hung on a rope 30 passing through an upper pulley of a pivoted boom 29, and a grounding frame 32 through which the casing tube 6 penetrates the front end of the chassis 10 is vertically moved. The lower end of the front and rear outriggers 8, 8 which are vertically mounted on both sides of the support frame 9 are connected to the both sides of the grounding frame 32, respectively. Lifting drive 4
The lower ends of the piston rods of hydraulic cylinders 35 vertically mounted on both sides of the support frame 9 are connected to brackets 36 provided at both ends on the diameter line of the lifting frame. Reference numeral 37 denotes a lifting drive 4 while operating the ring gear drive 2.
When the casing tube 6 is pushed into or pulled out of the ground, a telescopic telescopic rod for transmitting a rotational reaction force of the casing tube acting on the lifting frame 3 to the chassis 10, and a base end of the telescopic rod 37. The fork-shaped portion 37a (see FIG. 2) at the tip is pivotally supported on the lift frame 3 by pins 38. As shown in FIG. 2, the outrigger 8 is a conventionally known one in which a hydraulic cylinder 40 for expanding and contracting the telescopic telescopic cylinder 39 is mounted in a telescopic telescopic cylinder 39.

In FIG. 3, reference numeral 41 denotes an outrigger mounted on both sides of the rear end of the chassis 10, reference numeral 42 denotes a bobbin of the rope 30 mounted on the chassis 10, reference numeral 43 denotes a derrick cylinder of the boom 29, and reference numeral 44 denotes a hammer grab 31 for discharging the hammer glove 31. A pusher mounted on the boom so that it can be pushed into position.

In this self-propelled drilling machine, the supporting frame 9 is held horizontally by the front and rear outriggers 8 and 41, the grounding frame 32 is grounded horizontally, and the casing tube 6 held and tightened by the clamp unit 1 is rotated by the ring gear driving device 2. Then, the lifting frame 3 can be raised and lowered with respect to the ground by the lifting driving device 4, and after the casing tube is pushed into the ground, the hammer grab is performed.
The operation of piercing at 31 is repeated, and the casing tubes are sequentially pushed into the ground to a required depth, or the casing tubes are removed after the fresh concrete is poured.

〔The invention's effect〕

 According to the present invention, the following effects can be obtained.

(1) According to the first aspect of the present invention, by storing the clamp unit in the lifting frame, the fresh concrete can be gravity-injected from the ground cocrete mixer into the casing tube pushed in at the time of drilling. It is not necessary to set up a slope as in the past, and it is possible to work in a narrow work site. In addition, a C-shaped cross section where the flange forming part for holding the ring gear up and down is provided above and below the ring forming part Combination of a clamp unit composed of the above segments and a lifting frame having an inverted L-shaped cross section prevents an increase in the width of the drive device of the large-diameter casing tube, and facilitates on-road transportation of the self-propelled drilling machine. In addition to this, it is possible to prevent power loss in gear transmission, loss of gears, and the like.

(2) According to the configuration of the second aspect, it is possible to vertically rotate the fresh concrete gravity injection gutter in the opening of the flat U-shaped support frame, and it is easy to introduce the concrete mixer truck into the drive device of the casing tube. And the casing tube can be easily attached to and detached from the drive device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of one embodiment of the present invention (X-
FIG. 2 is a plan view, FIG. 3 is a side view of the self-propelled drilling machine, and FIG. 4 is an enlarged view of FIG.
5 is an enlarged view of a main part of FIG. 1 ... clamp unit, 1a ~ 1e ...... segment,
(A): Ring forming part, (B), (C): Flange forming part, 2: Ring gear driving device, 3: Lifting frame, 3a ...
Peripheral wall plate, 4 ... Driving device, 5 ... Ring gear, 5a
... non-gear part, 6 ... casing tube, 7 ... ball bearing, 7a ... outer ring member, 8 ... outrigger, 9 ... support frame, 10 ... chassis, 31 ... hammer grab, 32 ...
Ground frame.

Claims (2)

(57) [Claims] A clamp unit in which several arc-shaped segments holding a casing tube are connected in a chain shape, and segments at both ends thereof are connected by a hydraulic cylinder.
A self-propelled machine having a built-in ring gear for rotating the clamp unit, a lifting frame (3) having a plurality of ring gear driving devices (2) mounted in a symmetrical arrangement, and a lifting driving device (4) for the lifting frame. A drive device for a casing tube of a drilling machine, which projects radially outwardly above and below a highly rigid annular forming portion (a) forming each segment (1a to 1e) of a clamping unit (1). A ring gear (5) having a flange forming portion (b, c) and a non-gear portion (5a) between upper and lower flange forming portions of all the segments is always slidably movable along upper and lower end surfaces thereof. The upper and lower flange forming portions of the intermediate segment (1c) are fixed to the ring gear so that the casing tube (6) held and clamped and clamped by the clamp unit is concentric with the ring gear (5). Non gear portion Gugiya (5a)
An outer ring member (7a) of a ball bearing (7) using the inner ring member as an inner ring member is disposed outside the outer ring member. The outer ring member is an outer peripheral wall plate (3a) of a lifting frame (3) having an inverted L-shaped cross section. A casing tube drive device, which is integrally fixed to the housing. 2. A support frame (9), which is provided on both sides and supports the upper end of an elevating drive device (4) and an outrigger (8), respectively, is provided in front of a chassis (10). 2. A drive device for a casing tube according to claim 1, wherein said drive device is formed in a letter shape.