JP2568985B2 - Removable anchor steel wire drawing and recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for pulling and recovering a removable anchor steel wire.

[0002]

2. Description of the Related Art Conventionally, as a pull-out and recovery device for a removable anchor steel wire, there has been proposed a configuration in which an anchor steel wire is drawn and recovered by using a winch.

When the anchor steel wire is drawn and collected,
The withdrawal resistance is overwhelmingly large for a while immediately after the start of the withdrawal operation, and after the initial withdrawal operation is completed, the withdrawal resistance decreases considerably thereafter.

Conventionally, the output of a hydraulic motor for driving the winch has been set in accordance with the maximum pulling resistance immediately after the start of the pulling operation. However, this requires the installation of a high output hydraulic motor, and the hydraulic motor has to be installed. In addition, the size of the hydraulic unit is increased, the equipment cost is increased, and the moving and transporting and installation are labor-intensive, take up space, and are not very convenient.

[0005] The present invention has been made to solve such a conventional problem.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a drawing and recovery device provided with a winch for drawing and winding a removable anchor steel wire out of an anchor hole. And a second drive system having a hydraulic cylinder as a drive source, wherein a mechanism for converting a linear reciprocating motion of the hydraulic cylinder into an intermittent rotary motion is incorporated in the second drive system. The present invention relates to a pull-out and recovery device for a removable anchor steel wire.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings.

As is clear from the front view shown in FIG. 1, the longitudinal side view shown in FIG. 2 and the plan view shown in FIG. 3, the winch 2 supported on the vertically upright side plate 11 of the frame 1 is provided. And a hydraulic motor 3 for driving the winch 2 and a hydraulic cylinder 4. The hydraulic motor 3 configures a first drive system, and the hydraulic cylinder 4 configures a second drive system.

The frame 1 is held in an upright state by two parallel legs 12, 12 projecting forward from both sides at the lower end of the side plate 11, and two front projections are provided on both sides at the upper end of the side plate 11. Are provided.

The winch 2 is, as apparent from FIG.
A fixed central shaft 21 protruding forward from the side plate 11 (see FIGS. 1 to 3) of the frame 1 is provided.
The rotating shaft 22 concentric with the shaft 1 is fitted and supported in the axial direction via a bearing 221 in a state where the shaft is not removed.

The rotating shaft 22 has a rear flange plate 23 at an intermediate portion in the axial direction.
a, and a tapered winding drum 24 is provided on the rotating shaft 22 with a key and a key groove so as to be located in front of the rear flange plate 23a.
In addition, it is stopped by a detent means (not shown) such as a spline connection and is fitted and supported concentrically so as to be movable in the axial direction.

At the center of the front end of the rotating shaft 22, a screw rod 25 protruding coaxially forward is attached at the base end via a bearing 251 so as to be rotatable around the axis.
A first nut 26 is screwed on top.

The first nut 26 is provided with an inner locking flange 261 projecting outward on the outer periphery of the rear end portion.
4 is locked inside the outer locking flange 241 projecting inward from the front end of the outer locking flange 4. The inner and outer locking flanges 261 and 241 are combined and integrated by applying a fitting such as a screw (see FIG. 2). ) Has been. Thus, the first nut 26 is provided with the inner and outer locking flanges 26.
When the screw 25 is turned by the application of a tool such as a wrench in the polygonal turning operation part 252 at the front end of the screw 25, the screw 25 is stopped by the rotation shaft 22 via the winding drum 24. First nut 26 and winding drum 24
Reciprocate integrally in the axial direction.

A recessed step is formed in two steps from an intermediate portion in the front-rear direction of the first nut 26 to the front end, and a front flange plate 23b is fitted into the first recessed step 262 in a mounting hole 231b at the center. Be mounted.

On the outer peripheral surface of the second concave step portion 263, a screw portion 26 is formed.
4 is formed, and a second nut 27 is screwed onto the screw portion 264 to tighten and fix the front flange plate 23b. The second nut 27 is provided with a rotating operation part 27 for enabling manual operation.
1 is protruded.

To enable the anchor steel wire a (see FIG. 2) wound on the winding drum 24 to be grasped and bound in the wound state, the outer peripheral surface of the winding drum 24 and the front and rear flange plates 23 are formed.
ribs 242, 232b, 2 on the inner surfaces of b, 23a, respectively.
31a is formed in a protruding state.

The ribs 242 of the winding drum 24 extend in the axial direction, and the ribs 232b and 231a of the front and rear flange plates 23b and 23a extend in the radial direction, and are formed at a plurality of locations, for example, four locations at 90 ° intervals.

A stopper 28 (see FIG. 3) for detachably inserting and fixing the starting end of the anchor steel wire a is fixed to the inner surface of the rear flange plate 23a integral with the rotating shaft 22.

The stopper 28 must have such a structure that the steel wire can be securely fastened so as to be able to resist the maximum pull-out resistance at the beginning of the drawing operation of the anchor steel wire. A structure similar to a known connecting device used for connecting anchor steel wires to each other may be used.

FIG. 5 shows an example of the stopper 28. The stopper 28 can be inserted into a cylindrical metal fitting 281 through which a steel wire a can be inserted and removed from a side through a slit 281a. It comprises a cylindrical holder 282 and a split-type wedge-shaped chuck fitting 283 which can be driven into the cylindrical holder 282 while the steel wire a is being chucked. The receiving fitting 281 is an outer periphery of the rear flange plate 23a of the winch 2. It is fixed to the inner surface by applying means such as welding. A concave step 281 b for fitting and locking the front end of the cylindrical holder 282 is formed on the rear end side of the receiving fitting 281.

The hydraulic motor 3 constituting the first drive system is shown in FIG.
As shown in FIG.
The output is transmitted to the rotary shaft 22 of the winch 2 via the output shaft 31 and the gear transmission mechanism 32.

Hydraulic cylinder 4 constituting second drive system
Is supported by the one arm 13 of the frame 1 as shown in FIG. 1, and its output is transmitted to the rotary shaft 22 of the winch 2 via a mechanism 5 for converting a linear reciprocating motion into an intermittent rotary motion. It has such a configuration.

An example of the conversion mechanism 5 will be described with reference to FIGS.

The conversion mechanism 5 includes a ratchet wheel 51 fitted and fixed to the rotary shaft 22 of the winch 2, a feed pawl 52 for engaging the toothed portion 511 on the outer peripheral surface of the ratchet wheel 51, and a straight line of the hydraulic cylinder 4. A rotary member 53 that swings freely about the rotary shaft 22 with the reciprocating motion; and a rotary member 53 that swings freely about the rotary shaft 22. The feed claw 52 is supported at an eccentric position of the rotary member 53.

As shown in FIG. 4, the rotating member 53 has a ring shape having a groove-shaped cross section, and a ring-shaped groove 531 on the inner peripheral surface.
At the same time, freely fits into the toothed portion 511 of the ratchet wheel 51, and slides on the smooth surfaces 512, 512 on both sides of the outer peripheral surface of the ratchet wheel 51 on the smooth surfaces 532, 532 on both sides of the inner peripheral surface, An overhang portion 533 (see FIGS. 6 and 7) that protrudes outward is provided on a part of the outer peripheral portion.

As shown in FIGS. 6 and 7, the distal end of the piston rod 41 of the hydraulic cylinder 4 is fixed to a pin 42 at one end of the overhang portion 533, and the feed claw 52 is fixed to the pin 521 at the base end at the other end. Have been. The tip of the feed claw 52 meshes in one direction with the toothed portion 511 of the ratchet wheel 51 through an opening 534 formed in the outer peripheral surface of the rotating member 53, but is engaged so as to be free in the other direction. I have.

FIG. 6 shows a state in which the piston rod 41 of the hydraulic cylinder 4 is in the backward movement position, and FIG. 7 shows a state in which the piston rod 41 is in the forward movement position. The part moves on a locus L (indicated by a phantom line in FIG. 6) of a circle centered on the rotating shaft 22. In order to enable this curved movement, the hydraulic cylinder 4 uses a stop shaft 43 as a fulcrum. And is supported by the arm 13 so that it can swing in the direction of the arrow.

FIG. 8 schematically shows a hydraulic unit 6 and a hydraulic circuit for operating the hydraulic motor 3 and the hydraulic cylinder 4.

In FIG. 8, reference numeral 61 denotes an oil tank;
Denotes an electric motor, 63 denotes a hydraulic pump, and 64 and 65 denote directional control valves. When necessary, the hydraulic circuit on the hydraulic cylinder 4 side is closed by operating the directional control valve 65, so that only the hydraulic cylinder 4 is stopped. be able to.

When the anchor steel wire is pulled out and collected, the fastening device for the steel wire is disassembled as usual, and then the apparatus of the present invention is used as shown in FIG. It is installed at the entrance. In this installation state, one end face of the frame 1 abuts the slope C, and the abutting portion supports the reaction force when the steel wire is drawn.

[0031] From the inlet portion of the anchor hole b, the end portion a ₁ of the anchor steel wire a by dismantling of tightening the fixing portion projects outwardly from slopes, schematically one end a ₁ in FIG. 1 As shown in the figure, the winch 2 is inserted and fixed to a stopper 28 on the inner surface of the rear flange plate 23a.

Next, the hydraulic motor 3 and the hydraulic cylinder 4
, The drawing and winding of the steel wire a is started.

In the initial stage of the start of drawing and winding of the steel wire a, the drawing resistance is the highest and depends on the scale of construction of the removal anchor, but usually requires a drawing force of about 3000 to 7000 kg. After the initial operation, 1
About 2,000 to 2,000 kg is sufficient.

According to the apparatus of the present invention, for example, 5000 kg of 7000 kg required for the initial pulling operation is secured by operating the hydraulic cylinder 4 and the remaining 2000 kg is secured by operating the hydraulic motor 3. it can.

With this configuration, it is not necessary to adjust the output of the hydraulic motor 3 to the maximum pulling force. In the above specific example, the output of the hydraulic motor 3 may be set to about 1/3 of the maximum pulling force. The size of the motor 3 and the hydraulic unit 6 can be reduced.

On the other hand, since the hydraulic cylinder 4 is small and can provide high output, even if the hydraulic cylinder 4 is provided in parallel, the increase in the capacity, weight and equipment cost of the entire apparatus is very small, and the hydraulic motor 3 and the hydraulic unit 6 The merit of miniaturization is much greater.

Since the output of the hydraulic cylinder 4 is transmitted to the rotary shaft 22 of the winch 2 via the conversion mechanism 5 as an intermittent rotational motion, the pulling speed of the anchor steel wire a during this period is considerably reduced.

However, the maximum pulling force is required only during the initial operation, for example, during the pulling operation of about 1 to 2 m, and after the initial operation is completed, the pulling is performed by the output of the hydraulic motor 2 for the remaining, for example, about 50 to 100 m. Since the take-up is possible, even if the hydraulic cylinder 4 is used as a drive source at the initial stage of the draw-out, the adverse effect on the entire draw-up / take-up operation is extremely small and can be ignored.

After the drawing and winding operation of the anchor steel wire a is completed, the steel wire a is bound at a plurality of positions using a wire (not shown) in the wound state. This binding is performed by the ribs 231 provided on the front and rear flange plates 23 a and 23 b and the winding drum 24.
The insertion gap 7 (see FIG. 2) is formed around the wound steel wire a by the a, 232b, and 242, so that the wire can be easily inserted by inserting the wire into the insertion gap 7. .

When the binding of the drawn and wound steel wire a is completed, one end a ₁ of the steel wire a is removed from the stopper 28 and then the second wire a is removed.
By rotating the nut 27, the second nut 27 and the front flange plate 23b are removed from the first nut 26.

Next, the screw rod 25 is connected to the rotation operating section 2 at the tip end thereof.
When rotated at 52, the first nut 25 moves forward on the screw rod 25 by the principle of screw feed, and along with this movement, the winding drum 24 integrally coupled with the nut 25 moves forward on the rotating shaft 22, At this forward movement position, the anchor steel wire a of the previously bundled bundle is pulled forward from the winding drum 24 along the taper and collected.

After the anchor steel wire a is recovered in the grasped and bound state, the first nut 26 and the winding drum 24 are returned to the initial positions by the turning operation of the screw 25 in the reverse direction, and the front flange is further rotated. The plate 23b is fixed in the initial position by tightening the second nut 27, and is ready for the next pull-out and recovery operation.

[0043]

According to the present invention, of the pulling force required for pulling and winding the anchor steel wire, an additional high pulling force required at the time of initial operation is secured by operating the hydraulic cylinder. Therefore, the output of the hydraulic motor should be suitable for the low pulling force required for normal pulling and winding after the initial operation, and the hydraulic motor and the hydraulic unit can be reduced in size and weight, and a compact structure can be achieved. This kind of extraction and recovery device can be provided with ease of use, and equipment costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view showing one embodiment of the present invention.

FIG. 3 is a plan view showing one embodiment of the present invention.

FIG. 4 is an exploded detailed view of a winch provided in the apparatus of the present invention.

FIG. 5 is a perspective view showing an example of a stopper provided in the apparatus of the present invention.

FIG. 6 is an explanatory view of the operation of the hydraulic cylinder in a returning state.

FIG. 7 is an operation explanatory view of the hydraulic cylinder in a forward movement state.

FIG. 8 is an explanatory diagram schematically showing a hydraulic circuit of a drive system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 11 Side plate 12 Leg 13 Arm 2 Winch 21 Fixed central axis 22 Rotation axis 23a Rear flange plate 23b Front flange plate 24 Winding cylinder 25 Screw 26 First nut 27 Second nut 3 Hydraulic motor 31 Output shaft 32 Gear transmission Mechanism 4 hydraulic cylinder 41 piston rod 42 pin 43 stop shaft 5 conversion mechanism 51 ratchet wheel 52 pawl portion 53 rotating member 6 hydraulic unit 61 oil tank 62 electric motor 63 hydraulic pump 64 direction control valve 65 direction control valve

Claims (2)

(57) [Claims] 1. A drawing and recovery device provided with a winch for drawing and winding a removable anchor steel wire from an anchor hole, wherein a first drive system using a hydraulic motor as a drive source and a first drive system using a hydraulic cylinder as a drive source. And a second drive system,
A removable anchor steel wire drawing and recovery device, wherein a mechanism for converting a linear reciprocating motion of a hydraulic cylinder into an intermittent rotary motion is incorporated in a drive system. The conversion mechanism includes a ratchet wheel fitted and fixed on a rotating shaft of a winch, a feed pawl engaged with a tooth portion on an outer peripheral portion of the ratchet wheel, and a linear reciprocating motion of a hydraulic cylinder. 2. The drawing and collecting apparatus according to claim 1, further comprising: a rotating member that swings and rotates freely about the rotating shaft, wherein the feed pawl is supported at an eccentric position of the rotating member.