JP3420171B2 - Pipe anchor underground pushing 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 underground pushing device for a pipe anchor.

[0002]

2. Description of the Related Art As a method of laying a wire rope along the ground or mooring the end of the wire rope to the ground, a pipe anchor is used and pushed into the ground. There is a known method of attaching hardware to.

Such pipe anchors are typically shown in FIG.
As shown in (a), a narrowed portion a with a relatively steep angle
And an inner ring c made of a hard material is fixed to the boundary portion between the recessed portion a and the straight portion b thereafter. As a means for pushing the pipe anchor A into the ground, there is known a pushing device in which a piston hammer which reciprocates by fluid pressure is built in a body and the rear end of a sharp point is opposed to the piston hammer.

Such a pushing device pushes the pipe anchor A into the ground by fitting the pipe anchor A and propelling the pipe anchor A.
As shown in FIG. 4B, the hollow body 6 containing the piston hammer 2a is machined so as to have a holding taper portion 6a having a gentle angle. It was inserted from the rear side in the body axial direction so as to come into contact with the inner surface of the holding tapered portion 6a.
Therefore, at the time of use, the inner ring c of the pipe anchor A comes into contact with the holding tapered portion 6a, and the tip end portion a ′ of the recessed portion of the pipe-shaped anchor A comes into contact with the middle portion of the holding tapered portion. Was there.

In this structure, however, since the point 7 is simply held by the taper fitting contact with the body 6, if the point 7 hits a hard object such as a stone during the pushing operation, FIG. It was easy for point 7 to retract from the opening at the tip of the body. Further, since the tip end region 600 of the holding taper portion 6a is in contact with the point 7, fatigue is caused at an early stage, and the point 7 comes out of the body 6 due to cracking and spreading, and in any case, there is a problem that it becomes unusable. It happened a lot.

Further, since there is a space K between the hammer 2a, the point 7 and the inner surface of the body, dents and cracks are likely to be generated in the body 6 of the portion due to the hard inner ring c and the external pressure due to earth pressure. There was a problem that the body 6 could not be used due to damage. Furthermore, pipe anchor A
Receives a striking force and external pressure while being in contact with the retaining taper portion 6a of the body 6 at the tip end surface a'and the inner ring c, so that a biting phenomenon occurs at the contact portion with the inner ring c,
When the body 6 is moved backwards and is pulled out from the pipe anchor A after the driving, the pipe anchor A also moves together. Therefore, after pulling out the pushing device, the pipe anchor A is again moved to another underground. Since it had to be pushed in, there was a problem that workability and work efficiency deteriorated.

[0007]

SUMMARY OF THE INVENTION The present invention was devised to solve the above-mentioned problems. The purpose of the present invention is to remove points, bite into the body, and recover the device. An object of the present invention is to provide an underground pushing device for a pipe anchor that can reliably prevent the anchor from being lifted up and can replace a damaged portion. INDUSTRIAL APPLICABILITY The present invention not only pushes underground pipe anchors, but also water pipes, electric wires,
It can be applied to underground push-in and pull-out of pipes for laying telephone cables.

[0008]

In order to achieve the above object, the present invention has a recessed portion at the tip and an inner ring is fixed to the boundary between the recessed portion and the straight portion thereafter. A device for pushing a pipe-shaped anchor into the ground, which has a built-in piston hammer reciprocated by a pressurized fluid from a hose, a pipe-shaped body with an internal thread inside the tip, and a first taper in the tip region. And a point having a shaft portion with a recess hit by the piston hammer in the rear end region, and has a male screw on the outer circumference of the shaft portion of the point, to which the female screw of the body is screwed. The shaft and the first taper part have a gentler angle than the first taper part and are in contact with the inner ring of the pipe anchor and the end of the taper part beyond that. First It is characterized by having a tapered portion. The male screw and the female screw are preferably trapezoidal screws.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an embodiment of an underground pushing device for a pipe anchor according to the present invention.
FIG. 1 shows the state of the apparatus alone, and FIGS. 2 and 3 show the essential parts of the present invention. Reference numeral 1 is a body, which is composed of a pipe having substantially the same diameter over the entire length. An internal thread 10 is provided on the inner surface of the tip portion of the body 1 as shown in FIGS. The female screw 10 is preferably a trapezoidal screw. Reference numeral 2 is a striking device body built in the body 1, which is the same as the conventional one. That is, the tapered striking end 200
Is the piston hammer 2a that reaches the tip of the body 1,
Valve 2b fitted in the bag hole formed at the rear end of this
And a damper 2c connected to the valve 2b. The valve 2b extends rearward and is connected to a supply hose 2d for supplying a fluid such as compressed air. The supply hose 2d is connected to a fluid supply source such as an air compressor 2e. Has been done.
The piston hammer 2a has a lateral hole near the rear end of the blind hole.

2g is a valve nut, 2h is a damper packing, 2i is a valve cover, 2j is a stopper,
These configurations are the same as known ones. However, the fact that a rubber protector 2f is arranged on the supply hose 2d is a characteristic that has not been found in the past. This protector 2f has a groove 201 so that it can be fitted to the rear end of the pipe anchor A that is pushed into the ground. As shown in FIG. 4, the pipe anchor A has a relatively steep concavity a at the tip.
Is formed, and an inner ring c of a hard material is fixed to the boundary portion between the recessed portion a and the straight portion b thereafter, which is the same as a known one.

3 is a point made of tool steel, stainless steel, etc., and, following the sharpened tip, a steep angle α substantially equal to the angle of the recessed portion a of the pipe anchor A, for example, 36 ° ± 6 ° 1 taper portion (intermediate taper portion) a and a relatively gentle angle β from the rear end thereof, for example, 10 ° ±
A second taper portion 3b that extends at 4 ° and has a terminating portion 31 whose diameter is enlarged at the terminating end with a relatively strong curved surface, and a shaft portion 3c that extends rearward via a ring-shaped step surface 33 behind the terminating portion 31. have. The second taper portion 3b is provided with a plurality of tool engagement holes 35 for screwing operation with the body 2. As shown in FIG. 2C, the second taper portion 3b has a first
The length is larger than that of the tapered portion 3a, the diameter of the tip region is smaller than the inner diameter of the inner ring c, and the diameter of the rear end region is the inner ring c.
Is larger than the inner diameter of.

The shaft portion 3c has a trumpet-shaped recess 32 having a diameter increasing toward the rear end so as to correspond to the tapered striking end 200 of the piston hammer 2a in the central portion, and a trapezoidal outer periphery. A male screw 30 composed of a screw is formed. A ring-shaped packing material 4 made of stainless steel or the like is arranged on the ring-shaped step surface 33, and the female screw 10 of the body 1 is attached to the male screw 30 of the point 3 so that the tip end surface of the ring-shaped packing material 4 contacts the ring-shaped packing material 4. Screwed together,
As a result, the body 1 and the point 3 are integrally connected. If necessary, an adhesive may be applied to the engaging portion of the male screw 30 and the female screw 10.

[0013]

The operation and operation of the device of the present invention will be described below. When pushing the anchor pipe A into the ground, the device of the present invention is inserted from the rear end of the pipe anchor A. By doing so, as shown in FIG. 2C, the tip end circumference a ′ of the pipe anchor A abuts on the tip end region of the second taper portion 3 b at the point 3, and the inner ring c becomes the point 3 at the point 3. 2 Abutting on the rear end region of the taper portion 3b.

As described above, the point 3 is brought into contact with the ground surface of the planned construction site in a state of being combined with the pipe anchor A,
The pressurized fluid is continuously supplied from the fluid supply source 2e. In this way, the fluid under pressure that has passed through the valve 2b will not move to the piston hammer 2a.
It flows out from the lateral hole at the rear end portion to the outside, passes through the gap between the body 1 and the piston hammer 2a, and the piston hammer 2a
Wrap around the tip of and push up. Piston hammer 2
When a is retracted (raised), the pressurized pressurized fluid that had previously lifted the piston piston hammer 2a flows out rearward through the lateral hole and is discharged into the atmosphere by the damper. At this time, since internal pressure is generated in the blind hole of the piston hammer 2a, the piston hammer 2a is advanced and strikes the bottom of the recess 32 at the rear end of the point. Hereinafter, the above operation is repeated. This operation is the same as that of the conventional device, the point 3 is pushed into the ground, and the pipe anchor A is propelled in a state of being attached to the point 3.

During such propulsion, the pipe anchor A
The second tapered portion 3b having the point 3 at the tip a'of the narrowed portion
The inner ring c is in contact with the rear end region of the second taper portion 3b of the point 3 at the front end region of each of the points, and the contact points at these two positions are solid instead of hollow. Therefore, even if the pipe anchor A generates a tightening force in the inner diameter direction due to earth pressure, the point 3 is not deformed or dented, and fatigue fracture does not occur.

The pipe anchor A is in contact with the second taper portion 3b of the point 3 at two places around the circumference, and is not in direct contact with the body 1 but is loosely fitted concentrically. The body 1 is fastened and integrated by screwing the point 3 and the trapezoidal screws. Therefore, the blanking work for obtaining the assembly of the body and the pipe anchor A, which is required in the conventional device, is not required, and the main work can be rapidly performed. Moreover, since the body 1 is integrated by being screwed and fastened to the shaft portion 3c behind the point 3, there is no trouble that the point 3 is pulled into the body during pushing.

In the present invention, the short and steep first taper portion 3a for propelling the ground at the tip of the point 3 is provided.
The portion where the pipe anchor A comes into contact is not the body 1 but the second tapered portion 3b having a solid and gentle angle at the point 3 and the angle of the first tapered portion 3a and the pipe anchor A. The angle of the recessed portion a of the first taper portion 3a
Smoothly flows from the narrow portion a. By these, the pipe anchor A does not bite. Therefore, it is easy to pull out the body 2 to the rear side after being pushed to the required depth, and the pipe anchor A is not lifted up, and can be reliably positioned at the pushing position. Therefore, workability is good.

The body 2 and the point 3 do not loosen in the normal work because the male screw 30 and the female screw 10 which are trapezoidal screws are engaged with each other and the packing material 4 prevents the body 2 and the point 3 from being loosened, but the body 2 or the point 3 is repeatedly used. If the point is damaged due to fatigue or the like, it can be separated from the body 2 by rotating the point 3 to the loose side. Therefore, it can be regenerated by exchange and is economical.

If a rubber protector 2f is arranged on the supply hose 2d and the protector 2f is fitted to the rear end of the pipe anchor A with the groove 201 and the pushing operation is performed in that state, the pressurized fluid can be supplied. Even if the supply hose 2d swings to the left or right due to accompanying pulsation or the like, since it does not directly collide with the pipe anchor A, quietness is improved and damage due to the supply hose 2d contacting the rear end edge of the pipe anchor A can be prevented. it can.

[0020]

The effects of the present invention are as set forth above.
In the case of, the piston hammer 2a that is reciprocated by the pressurized fluid from the hose is built in, the pipe-shaped body 1 having the internal thread 10 inside the tip portion, and the first taper portion 3a in the tip region are provided. The area is provided with a point 3 having a shaft portion 3c with a recess hit by the piston hammer 2a, and a male screw 3 is provided on the outer circumference of the shaft portion of the point 3.
0, which is connected to the female screw 10 of the body 1 by screwing, and has a gentler angle between the shaft portion 3c and the first taper portion 3a than the first taper portion 3a. Since the inner ring c of the pipe anchor A and the second taper portion 3b that comes into contact with the tapered portion end a ′ beyond the inner ring c are provided, the point 3 comes out, the body 1 is dented, the pipe anchor A bites and As a result, it is possible to reliably prevent the anchor from being lifted when the device is recovered, and since the point 3 and the body 1 can be separated when necessary, they are excellent in that they can be replaced and economically reused when they are damaged. The effect is obtained.

According to claim 3, point 3 and body 1
An excellent effect is obtained in that it is securely fastened and the loosening is prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of a pipe anchor pushing device according to the present invention.

2A is a partially enlarged view of FIG. 1, FIG. 2B is a partially enlarged view of FIG. 1A, and FIG. 2C is a partially enlarged view showing a state during use.

FIG. 3 is a partially cutaway perspective view showing a connection between a body and points in the present invention.

FIG. 4A is a partially cutaway side view of a pipe anchor,
(B) is a vertical side view showing a conventional underground anchor pushing device of a pipe anchor in a used state, and (c) is a perspective view showing a state after using the conventional device.

[Explanation of symbols]

1 body 2 piston hammer 3 points 3a First tapered portion 3b Second taper part 3c Shaft 10 female screw 30 male screw 31 Terminal 32 recess

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-82114 (JP, A) JP-A-59-53172 (JP, A) JP-A-8-209697 (JP, A) JP-A-6- 322762 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 5/80 E02D 7/28

Claims (3)

(57) [Claims] 1. An inner ring c is provided at a boundary portion between the recessed portion and a straight portion b thereafter, which has a recessed portion a at the tip portion.
A device for pushing a pipe-like anchor fixed to the ground into the ground, which has a built-in piston hammer 2a which is reciprocated by a pressurized fluid from a hose, and which has a female screw 10 inside the tip portion.
And a point 3 having a first tapered portion 3a in the front end region and a shaft portion 3c with a recess hit by the piston hammer 2a in the rear end region. A male screw 30 is provided on the outer periphery of the shaft portion of the point 3 and is connected to the female screw 10 of the body 1 by screwing the male screw 30, and between the shaft portion 3c of the point 3 and the first taper portion 3a. The second taper portion 3b having a gentler angle than that of the first taper portion 3a and coming into contact with the inner ring c of the pipe anchor A and the taper portion end a ′ beyond the inner ring c.
An underground pushing device for a pipe anchor, which has: 2. A first taper portion 3a having a steep angle where a point 3 substantially coincides with the angle of the recessed portion a of the pipe anchor A.
And a second taper portion 3b extending from the rear end thereof at a gentle angle and having a terminating portion 31 whose diameter is enlarged by a relatively steep curved surface, and behind the terminating portion 31 via a ring-shaped step surface 33 toward the rear. The second taper portion 3b has a length larger than that of the first taper portion 3a, the diameter of the tip region is smaller than the inner diameter of the inner ring c, and the diameter of the rear end region is the inner ring. The underground pushing device for a pipe anchor according to claim 1, wherein the device is larger than the inner diameter of c. 3. The underground pushing device for a pipe anchor according to claim 1, wherein the male screw 30 and the female screw 10 are trapezoidal screws.