JPH0390707A - Pressing-in and pulling-off device for casing tube and usage thereof - Google Patents

Abstract

PURPOSE:To prevent the damage of a casing tube by a method wherein while the casing tube is pressed down to depth at which the press direction thereof is decided by a ground, guide rails are brought into slide contact with the respective vertical guide parts of a corresponding elevating frame, and at depth deeper than aforesaid depth, the guide rails are separated therefrom. CONSTITUTION:Through expansion of outriggers at the front and the rear of a self-running type boring machine, an earthing frame 5 is brought into pressure contact with a ground, and arranged in a horizontal state by means of a leveller. Guide rails 17 and 18 making slide contact with vertical guide parts 13 and 14 of an elevating frame 8 are supported to the lower ends of the inner cylinders of jacks 3 and 4, respectively. A tube is vertically pressed in a ground as a clamp unit 6 with which a casing tube is wrapped is rotated by a drive rotary device 7. When the tube is pressed down to depth at which the press direction of the tube is decided by a ground, the rails 17 and 18 are separated away from the guide parts 13 and 14 through a parallel clamp mechanism, and the tube is pressed down to a given depth. This method enables prevention of the damage of the tube and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a casing tube pushing and pulling device attached to a drilling machine for casting concrete piles in place using the all-casing method, and a method for using the same.

[Conventional technology]

Conventionally, when a lifting frame equipped with a clamp unit capable of holding and tightening a casing tube and a drive rotation device for the clamp unit is pushed down with an lifting cylinder and the casing tube is pushed into the ground, a self-propelled drilling machine or The grounding frame is aligned with the pile core and supported horizontally on the ground by the front and rear outriggers, and the lifting frame is guided up and down by the telescopic guide member or guide frame attached vertically to the grounding frame type or the body of the drilling machine, and the casing tube In order to reduce the frictional resistance between the outer wall and the ground, the casing tube is repeatedly pushed in and pulled out slightly.

(For example, Japanese Patent Application Laid-open No. 63-251520 and Japanese Patent Publication No. 42
(Refer to Publication No. 7948) [Problems to be Solved by the Invention] In this prior art, as the casing tube is pushed in, the supporting ground of each hydraulic jack horizontally supported by the body of the drilling machine and the grounding frame, Because irregular settling occurs due to changes in the reaction force when the casing tube is pushed in or pulled out, the elevating frame is fixedly supported by the pushed-in casing tube, with the telescopic guide member and guide frame that guide the elevating frame being tilted to a vertical position. This causes competition between the clamp unit and the telescopic guide member that guides it, resulting in a large loss of operating power for the clamp unit drive rotation device and lifting cylinder, and damage to the casing tube.

In order to avoid this, even if the tilted body of the drilling machine or the grounding frame is corrected to a horizontal position while pushing the casing tube, when the machine body or the grounding frame is tilted, each of the Since the lower end of the hydraulic jack is slidingly displaced with respect to the supporting ground, the telescopic guide member is eccentric with respect to the lifting frame fixed to the casing tube, resulting in a similar result.

The present invention provides that the core position accuracy and vertical accuracy of the cast-in-place concrete pile are determined while the casing tube is being pushed into the ground by 4 to 5 meters, and that during this pushing, the casing tube is connected to the lower end of the full hydraulic jack of the front outrigger. Focusing on the fact that if the grounding frame is supported on the ground, there is no risk of the horizontality of the drilling machine being disturbed, when pushing the casing tube into the ground, the direction of pushing is determined by the ground. During pushing, the lifting frame is guided by short guide rails attached to each hydraulic jack on the front outrigger of the drilling machine, and when pushing the casing tube to a deeper depth, the lifting frame is guided by the guide rails. The purpose is to solve the above problem by stopping the

[Means to solve the problem]

In order to achieve this object, the present invention has a front outrigger mount of a self-propelled drilling machine through which a casing tube can be loosely fitted, and a plurality of hydraulic jacks that cooperate with the rear outrigger to horizontally support the drilling machine. The outer cylinder is fixed vertically, and the lower ends of the inner cylinder of the full hydraulic jack are connected by a horizontal grounding frame through which the casing tube can be loosely inserted, and a clamp unit capable of holding and tightening the casing tube is provided. An elevating frame equipped with a drive rotation device for the clamp unit is disposed between the front outrigger frame and the grounding frame, and the elevating frame is provided with a plurality of vertical rods whose outer circumferences are equally divided and whose lower ends are connected to piston rods. The lifting cylinder is attached to the front outrigger frame, and the lifting frame and the body of the self-propelled drilling machine are connected by a link member that can only expand and contract, so as to allow the lifting frame to move up and down but prevent its rotation. In addition, a straight vertical guide part facing each hydraulic jack is provided on the lifting frame, and a short length is slidably engaged with each of the vertical guide parts so as to vertically guide the lifting frame by the extension/contraction stroke of the lifting cylinder. Each of the guide rails is supported by the lower part of the inner cylinder of the corresponding hydraulic jack, and means is provided for detaching the guide rail from the vertical guide section.

As a means for detaching the guide rail from the groove wall of the vertical groove, a pair of front and rear vertical guide portions are provided on sliding arms that are fixedly protruding from both sides of the diametrical line of the lifting frame, and an outrigger mount is installed between the sliding arms. A guide rail that engages and disengages from each of the vertical guide sections is installed via a parallel crank mechanism at the lower part of the inner cylinder of a pair of front and rear hydraulic jacks that are attached to both sides of the Preferably, the crank arm of each parallel crank mechanism is fixed in a horizontal position when slidingly engaged.

When using this device, hold the drilling machine horizontally with the front outrigger and rear outrigger with the grounding frame horizontally grounded, and push the casing tube into the ground to a determined depth. While pushing the casing tube, each guide rail is slidably engaged with the vertical guide part of the corresponding lifting frame, and when pushing the casing tube to a deeper depth, the guide rail is guided from the vertical guide part of the corresponding lifting frame. Remove the rail.

[For production]

Since the present invention has the above-mentioned configuration, the self-propelled drilling machine, which has moved to the place where concrete piles are cast by contracting the front and rear outriggers, simultaneously extends the hydraulic jacks of the front and rear outriggers, and then moves the grounding frame to the ground. At that time, if necessary, the grounding frame is set horizontally using a spirit level via a sandwich material.

Next, by finely adjusting the front and rear outriggers to horizontally support the drilling machine on the ground, each hydraulic jack, whose upper part is rigidly connected by the front outrigger frame, is fixed upright on the horizontal ground frame.

Therefore, a guide rail that is slidably engaged with each linear vertical guide part of the lifting frame is supported by the lower part of the inner cylinder of each corresponding hydraulic jack, and the guide rail is loosely fitted through the lifting frame and the grounding frame. The clamp unit, which holds and tightens the upright casing tube, is rotated by its driving rotation device while extending or slightly contracting the lifting cylinder, and the operation of opening the clamp unit and contracting the lifting cylinder. The casing tube is repeatedly pushed into the ground while being rotated. At this time, the rotational reaction force of the casing tube that acts on the lifting frame is transmitted to each hydraulic jack via the guide rail, and the front outrigger frame is Since the lower ends of each hydraulic jack whose upper part is rigidly fixed to each other are connected to each other by a horizontal grounding frame, there is almost no risk of the lower part of the inner cylinder of the hydraulic jack bending, and the rotational reaction force is transferred to the drilling machine or the grounding frame. Accept it within the frame.

In addition, the vertical support capacity of the front part of the drilling machine by the ground frame with a large ground contact area is large, and the support ground of the ground frame is prevented from uneven settling, so each guide rail maintains its verticality and the casing tube is vertically placed on the ground. pushed into.

In this way, when the casing tube is pushed into the casing at a depth determined by the ground in combination with the drilling of the inside of the casing tube by the drilling machine, each guide rail is separated from the corresponding vertical guide section. While guiding the casing tube vertically by the ground,
Push the casing tube to the required depth. At this time, the rotational reaction force of the casing tube acting on the lifting frame is received by the lifting frame and the drilling machine body via a link member that can only expand and contract.

Guide rails that engage and disengage from a pair of front and rear vertical guide portions of sliding arms protruding and fixed on both sides of the diametrical line of the lifting frame are respectively attached to the lower part of the inner cylinders of a pair of front and rear hydraulic jacks via parallel crank mechanisms. If the crank arm of each parallel crank mechanism is configured to be fixed in a horizontal position when each guide rail is slidably engaged with the corresponding vertical guide part, the mounting accuracy of the guide rail to the inner cylinder of each hydraulic jack can be improved. The mounting rigidity is increased, which not only improves the guiding accuracy of the lifting frame, but also
The guide rail can be quickly and easily engaged with and disengaged from the vertical guide section.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

The body 10 of the drilling machine has a crawler traveling device 2 as shown in FIG.
Hydraulic jacks 26 forming rear outriggers are mounted on both sides of the rear end of the fuselage 10, and a U-shaped front outrigger frame 2 is mounted on the front end of the fuselage 10, into which the casing tube 1 can be fitted loosely. are fixed respectively. On both sides of the front outrigger frame 2, outer cylinders 22 of a pair of front and rear hydraulic jacks 6.4 are fixed vertically, respectively, and are arranged axially symmetrically with respect to the casing tube 1. Each hydraulic jack 6.4 is the second
As shown in the figure and FIG. 4, an outer cylinder 22 having a square cross section
The lower ends of the inner cylinders of the fully hydraulic jack are horizontally connected to each other via universal joints 25. The lower end of the inner cylinder of the fully hydraulic jack, which is connected to the grounding frame 5 and allows slight tilting of the grounding frame, may be rigidly fixed to the horizontal grounding frame. Of course, each of the hydraulic jacks 3, 4, 26 on both sides can be controlled to expand and contract individually, or can be controlled to expand and contract simultaneously.

The clamp unit 6 has an arcuate segment 6a that holds the casing tube 1 as shown in FIGS. 2 and 3.
, 6b , 6c , 6d , 6e in sequence in a chain with pin 2
7, and the segments 6a and 6c at both ends are connected by a pair of upper and lower hydraulic cylinders 28, and each segment has a pin connecting portion connecting the bottle connecting portion 27 and both ends of the hydraulic cylinder 28, respectively. 29, the same U-shaped cross section is provided, with collar forming portions (B) and (C) protruding radially outwardly above and below a highly rigid annular forming portion (A), respectively.

A ball bearing 6 is installed at the bottom between the upper and lower flange forming parts of all segments.
A ring gear 31 formed on the inner ring member of the ball bearing 30 is always held so as to be slidable relative to each other in the horizontal direction, and the outer ring member 32 of the ball bearing 30 is attached to the lower part of the outer peripheral wall plate 8a of the lifting frame 8 having an inverted cross-section. It is fixedly supported in one piece. Reference numeral 66 denotes a pedestal attached to the lower side of the outer ring member 62. On the pedestal 33, there is a rotary seal (rotary seal) provided in the middle of an oil passage for supplying and discharging hydraulic pressure to the hydraulic cylinder 28 for opening and closing the clamp unit. ) 34 is attached so as to be concentric with the ring gear 61, and the rotary joint 3
The inner rotating portion of 4 is appropriately connected to the intermediate segment 6C. It is preferable that the reinforcing ring 8b provided on the inner periphery of the top plate of the lifting frame 8 is brought into substantially sliding contact with the top surface of each segment 6a to 6e.

The drive rotation device of the clamp unit includes a clamp unit 6 that holds and tightens the casing tube 1 and a ring gear 3.
1, the upper and lower collar forming parts (mouths) 9 of the intermediate segment 6c are fixed to the ring gear 31 with a number of bolts and nuts 65, and the hydraulic motors 66 are attached to the four corners of the lifting frame 8, respectively. An output side pinion 67 is interlocked and connected to a ring gear 61 via an intermediate gear 68. The hydraulic motor 36 may be configured to rotate in one direction, or alternatively may rotate in forward and reverse directions.

The vertical lifting cylinders 9 each have a pair of hydraulic jacks 6 at the front and rear.
．． The lower ends of the piston rods of both lifting cylinders 9 are sliding arms that project to both sides on the diameter line of the lifting frame 8. 12 and a bracket 39 installed on the top surface of the elevating frame.

13.14 shows a pair of front and rear vertical guide portions in the form of V-grooves recessed in the sliding arm 12 facing the front and rear hydraulic jacks 3 and 4, respectively, which are slidably engaged with the front vertical guide portion 16. Upper and lower crank arms 19 are connected between the guide rail 17, which is provided with a vertical V-shaped protruding strip, and the lower part of the inner cylinder of the hydraulic jack 3 that supports it, so as to form a parallel crank mechanism in cooperation with the two. Between the guide rail 18, which is connected at an angle of 40° and is provided with a vertical V-shaped protrusion that slides into the vertical guide portion 14 at the rear, and the lower part of the inner cylinder of the hydraulic jack 4 that supports the guide rail 18,
They are connected by upper and lower crank arms 20 and 41, which cooperate with each other to form the same parallel crank mechanism, but in order to operate both parallel two-link mechanisms symmetrically, the pair of upper and lower crank arms 19°40 Hydraulic cylinder 15 installed between diagonally positioned connecting pins of a parallel crank mechanism equipped with a hydraulic cylinder 15 installed between diagonally positioned connecting pins of a parallel crank mechanism equipped with a pair of upper and lower crank arms 20, 41. The front and back are arranged symmetrically. The hydraulic cylinder 15 in FIG. 4 is shown extended so as to separate the guide rail 17 from the wall surface of the vertical guide section 13, and the hydraulic cylinder 16 in FIG. The upper and lower crank arms 20, 41 are shown in a horizontal position when they are shown retracted into sliding engagement with each other.

The outer cylinder 22 of each hydraulic jack has upper and lower brackets 42 for connecting the crank arm that protrude and are fixed to the inner cylinder 26.
．． A vertical groove 22a into which the hydraulic jack 46 is fitted is provided to allow the hydraulic jack to contract.

As shown in FIG. 2, the link member 11, which is only extendable and retractable, connects the lift frame 8 and the fuselage 10, and has a corner rod 45 whose base end is pivoted to the fuselage 10 so as to be movable up and down. The rod 45 is provided with a rectangular tube 46 into which the rod 45 is slidably inserted, and the tips of fork portions 46a fixed to the rectangular tube are pivoted 47 to the elevating frame 8 so as to be movable up and down.

In FIG. 1, reference numeral 48 indicates a hammer tap for drilling a hole in the casing tube 1 which has been previously inserted. It is suspended from a cable 50. Reference numeral 51 designates a winding drum of the winding cable 50 mounted on the machine base 10, 52 a derrick cylinder of the boom 49, and 53 a pushing tool attached to the boom so as to be able to push the hammer grab 48 to the earth unloading position.

The embodiment in which the guide rails 17 and 18 corresponding to the vertical guide parts 13 and 14 of the lifting frame 8 are engaged and disengaged using a parallel crank mechanism has been described above. (V-grooves or ■-shaped protruding stripes are also acceptable)
Accordingly, it may be removably attached to the lower part of the inner cylinder of each hydraulic jack.

〔Effect of the invention〕

According to the present invention, the following effects are achieved.

(1) The outer cylinder is fixed vertically to the front outrigger frame, and the lower end of the inner cylinder of each hydraulic jack is connected with one horizontal grounding frame.
The short guide rail attached to the bottom of each inner cylinder is configured to vertically guide the lifting frame by the extension/contraction stroke of the lifting cylinder, so the rotational reaction force of the casing tube is absorbed by the perforator and the grounding frame, and the grounding The casing tube can be pushed vertically to a depth determined by the ground, while the frame prevents uneven settlement of the supporting ground, and the casing tube is close to the grounding frame. Since it is guided, the accuracy of the core position of the concrete pile is fully guaranteed.

(g) When the guide rails corresponding to the pair of front and rear vertical guide portions of the sliding arms protruding and fixed on both sides of the diametrical line of the lifting frame slide into engagement with each other, the crank arms of each parallel crank mechanism are fixed in a horizontal position. By doing so, the guide rail can be quickly and easily engaged and disengaged from the vertical guide portion, and not only can the man-hours for pushing and pulling out the casing tube be reduced, but also
The mounting accuracy and mounting rigidity of the guide rail used when guiding the lifting frame are increased.

(3) While pushing the casing tube to a depth determined by the ground, the casing tube is guided vertically by each guide rail, and when pushing the casing tube to a deeper depth, If each guide rail is removed from the lifting frame and the casing tube is guided to the ground, the casing tube will be pushed in and the hydraulic jacks that are horizontally supported, such as the drilling machine and the ground frame, will be pushed in. Even if the supporting ground settles unevenly due to changes in the reaction force when the casing tube is pushed in or pulled out, and the drilling machine and grounding frame are slightly inclined, the lifting frame and guide rail will compete with each other, causing the clamp unit to There is no risk of loss of operating power of the drive rotation device or lifting cylinder, or damage to the casing tube.

[Brief explanation of drawings]

Fig. 1 is a side view of one embodiment of the present invention, and Fig. 2 is its X-X
3 is a cross-sectional view of the elevator frame taken along line Y-Y in FIG. 2, and FIG. 4 is a cross-sectional view corresponding to the zz cross-section in FIG. 2. 1... Casing tube, 2... Front outrigger frame, 6, 4... Hydraulic jack, 5... Grounding frame, 6
... Clamp unit, 7... Drive rotation device for clamp unit, 8... Elevating frame, 9... Elevating cylinder, 10... Body of drilling machine, 11... Link member that can only expand and contract. , 12...Sliding arm, 13.14...Vertical guide section, 15.16...Hydraulic cylinder, 17.18...
...Guide rail, 19, 20...Crank arm,
26...Hydraulic jack, 66...Hydraulic motor, 40
, 41... crank arm. 4th session 4-2 3

Claims (1)

[Scope of Claims] 1. A front outrigger mount (2) of a self-propelled drilling machine into which a casing tube (1) can be loosely fitted is provided with a plurality of units that horizontally support the drilling machine in cooperation with the rear outrigger. The outer cylinders of the hydraulic jacks (3, 4) are fixed vertically, and the lower ends of the inner cylinders of the hydraulic jacks are connected by a horizontal grounding frame (5) through which the casing tube can loosely fit. An elevating frame (8) comprising a clamp unit (6) capable of holding and tightening the clamp unit and a drive rotation device (7) for the clamp unit is disposed between the front outrigger frame and the grounding frame, A plurality of vertical lifting cylinders (9), whose outer circumferences are evenly divided by the frame and connected to the lower ends of piston rods, are attached to the front outrigger mount to allow the lifting frame (8) to move up and down, but to prevent its rotation. , a linear vertical guide connecting the lifting frame and the body (10) of the self-propelled drilling machine with a link member (11) that can only expand and contract, and facing each hydraulic jack (3, 4), respectively. A corresponding hydraulic jack is provided with a short guide rail slidingly engaged with each of the vertical guide parts so as to vertically guide the lifting frame by the telescopic stroke of the lifting cylinder (9). A device for pushing and pulling out a casing tube, characterized in that it is provided with a means supported by the lower part of the inner cylinder of (6, 4) and capable of detaching the guide rail from the vertical guide section. 2. As a means for detaching the guide rail from the vertical guide part, a pair of front and rear vertical guide parts (13, 14) are provided on the sliding arms (12) which are fixed and protrude from both sides of the diametrical line of the lifting frame (8), respectively. The lower part of the inner cylinder of a pair of front and rear hydraulic jacks (3, 4) installed on both sides of the outrigger frame (2) with each sliding arm in between is connected to and disengaged from each of the vertical guide parts via a parallel crank mechanism, respectively. Install the guide rails (17, 18) to
When each guide rail is in sliding engagement with the corresponding vertical guide part, the crank arm (19, 20) of each parallel crank mechanism
, 40, 41) are configured to be fixed in horizontal positions. 3 Repeating the operations of extending or slightly contracting the lifting cylinder (9) of the lifting frame (8), which holds and tightens the casing tube with the clamp unit, and the operation of contracting the lifting cylinder with the clamp unit in the expanded state. , When pushing the casing tube into the ground, use the grounding frame (5)
The drilling machine is held horizontally by the front outrigger and the rear outrigger, which are horizontally grounded, and each guide rail is Claims characterized in that the guide rail is slidably engaged with the vertical guide part of the corresponding lifting frame, and when pushing the casing tube to a deeper depth, the guide rail is separated from the vertical guide part of the lifting frame. 1
Alternatively, the method of using the casing tube pushing/pulling device described in 2.