JP3062656B2 - Single pipe pipe removal aid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single pipe pipe withdrawal aid for pulling a single pipe from the soil, which is mainly used by being driven into the soil at a site of civil engineering work or the like.

[0002]

2. Description of the Related Art In civil engineering work and the like, a protection environment is used to protect the site environment. For example, when leveling a construction site, a protective wall is arranged along the excavation wall in order to prevent earth and sand from collapsing from the wall of the excavation site. Further, in order to isolate the site environment from the outside and prevent the diffusion of dust and noise to the neighborhood, a protective wall may be provided along the outer periphery of the construction site.

[0003] Protective walls used in the above applications are:
Both are temporarily installed and will not be needed after the construction. Therefore, a protective wall is constructed by arranging units of wood panels such as veneer, synthetic resin panels, or metal panels side by side on a skeleton usually constructed of a combination of so-called single pipes made of metal. Have been. By adopting such a structure, the dismantling and withdrawal operations are simplified, and at the same time, resources are saved and reuse is promoted.

[0004] In order to further enhance the stability of the protective wall to be constructed, it is necessary to previously drive a single pipe as a pillar of the skeleton deeply into the soil. At that time, heavy construction equipment such as a power shovel is used to reduce the burden on the worker. A driving aid such as that shown in FIG. 5 is used to facilitate driving of a single pipe with a power shovel or the like.

[0005] This driving aid has a flange 50 provided with a support 51 for forming a V-shaped groove on the upper surface, and the lower surface of the flange substantially has the inner diameter of the single pipe 6. Tube sections 52 having the same diameter are connected. In use,
As shown in FIG. 6, the pipe 52 is inserted from one end of the single pipe 6, and the opening of the single pipe 6 is abutted against the brim 50,
By pressing the tip of the backhoe 60 such as a power shovel downward while pressing it against the V-shaped groove of the support 51, the single pipe 6 can be driven deep into the soil.

In order to withdraw a single pipe that has been driven deep into the soil when dismantling and retreating the protective wall,
Again, heavy construction equipment such as a power shovel is used. In this case, a clamp as shown in FIG.

This clamp is composed of two clamp pieces 70 and 7 which are obtained by dividing a short cylindrical tube into two along a surface along a diameter direction.
0, and a pair of adjacent cut ends of the two clamp pieces 70, 70 are joined by a hinge 71. Further, bolts 72 and nuts 7 are provided at the cut ends of the clamp pieces 70, 70 on the side where the hinge 71 is not disposed.
3 are provided, and these bolts 72 and nuts 7 are provided.
By combining and tightening the three, the object inserted in the clamp can be fastened and fixed.

When pulling out a single pipe using the above-mentioned clamp, a clamp is attached to a portion of the single pipe that has been driven into the ground and protrudes above the ground, and a bolt 72 and a nut 73 are tightened. The peripheral surface of the inserted single pipe is fastened and fixed, and a wire is connected to a clamp using an appropriate attachment. The wire is attached to an arm of a heavy construction machine such as a power shovel and pulled up.

[0009]

In the above-mentioned clamp, since it is necessary to tighten bolts in order to fasten and fix the single pipe, it takes time and labor to attach and detach. Especially at construction sites where a large number of single pipes are used, the protective wall must be dismantled /
Delays in the withdrawal process may affect other processes.

In the above-described clamp, the peripheral surface of the single pipe is fixed only by the fastening force generated by a set of bolts and nuts. Therefore, the fixing of the peripheral surface of the single pipe tends to be uncertain. As a result, the work may not be performed smoothly due to the fact that only the clamp is pulled out while leaving the single pipe during the drawing, or the clamp itself is damaged without being able to withstand the lifting force. Further, when the clamp is broken, various pieces such as each clamp piece and bolts and nuts are scattered around, so that there is a great problem in the safety of the worker.

The present invention has been made in view of the above-mentioned circumstances, and since it can be easily attached and detached, the drawing operation time per single pipe is shortened, and the single pipe is gripped more firmly than before. It is an object of the present invention to provide a single-pipe extraction aid that does not cause the risk of fragment scattering.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a single pipe pulling aid for pulling out a single pipe, and an object of the present invention is to provide a ring for fastening a wire at an upper end. A main member having a first rotating shaft and a second rotating shaft at an intermediate portion and a lower end, respectively, and an inverted U-shaped jaw and a convex portion extending upward from near the top of the jaw. A guide member having a third rotation axis and a fourth rotation axis at one end of the jaw and an upper end of the projection, respectively, and mounted on the first rotation axis and the third rotation axis; A connecting member for connecting the main member and the guide member, and a fourth member mounted on the second rotation shaft and the fourth rotation shaft for connecting the main member and the guide member, and A gripping member provided with an outer wall pressing portion at an end on the side to be connected, The distance between the shaft and the fourth rotation shaft is made longer than the distance between the first rotation shaft and the third rotation shaft, and the main member is pulled up to thereby allow the fourth jaw of the guide member to move upward. This is achieved by closing the inner wall pressing portion provided at the end on the side where the rotation axis is not formed and the outer wall pressing portion of the gripping member. Further, each of the closed surfaces of the outer wall pressing portion and the inner wall pressing portion may be formed into a curved shape corresponding to the curvature of the peripheral surface of the single pipe pipe, or the outer wall pressing portion and the inner wall pressing portion may be closed. The above object of the present invention is more effectively achieved by engraving anti-slip irregularities on each surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of a single pipe pipe pulling aid according to the present invention. The single-pipe extraction aid of the present invention has a structure in which four members 10, 20, 30, 40 are connected to four rotating shafts 1, 2, 3, and 4, respectively. 2, 3, and 4 are located at the vertices of a square formed with these four members 10, 20, 30, and 40 as respective sides. Other three members 20, 30, 40
At an upper end of the longer main member 10, a ring 11 for connecting a wire using an appropriate fixture is attached, and at an intermediate portion and a lower end of the main member 10, a first rotating shaft 1 is attached.
And the second rotation shaft 2. The main member 10
The guide member 20 at the position of the side opposite to the above has an inverted U-shaped jaw 21 and a convex portion 23 attached near the top of the jaw 21. One end 2 of the inverted U-shaped jaw 21 on the side close to the main member 10
Fourth rotation shafts 4 are provided in 1a, respectively. Further, an inner wall pressing portion 22 is provided on a side where the fourth rotation shaft 4 is not provided, that is, on one end 21b of the inverted U-shaped jaw 21 on a side far from the main member 10.

A first member is provided between the main member 10 and the guide member 20.
Both ends are pivotally attached to the rotating shaft 1 and the third rotating shaft 3, and are connected by a connecting member 30 forming a link structure 31. Further, a gripping member 40 is provided at a position of a side facing the connecting member 30, and is attached to the second rotating shaft 2 and the fourth rotating shaft 4 to connect the main member 10 and the guide member 20.
Similarly, a link structure 41 is configured. This gripping member 4
The second rotating shaft 2 is connected to one end 40 a of the guide member 20, but an outer wall pressing portion 42 is provided at the end 40 b on the fourth rotating shaft 4 side to face the inner wall pressing portion 22 of the guide member 20. ing. The four rotating shafts 1, 2, 3, 4 are arranged such that the link structure 41 formed by the guide member 40 is longer than the link structure 31 formed by the connecting member 30. Therefore, when the guide member 20 is viewed in a fixed state, the main member 10 can move up and down along the long axis direction within a range permitted by each of the link structures 31 and 41. Therefore, when the guide member 20 is stationary,
Outer wall pressing portion 42 provided at tip 40b of gripping member 40
However, in accordance with the movement along the major axis direction of the main member 10, the main member 10 performs a rotational movement about the fourth rotation shaft 4 to increase or decrease the distance between the main member 10 and the inner wall pressing portion 22 provided on the guide member 20.

When using the single pipe pipe pulling aid of the present invention having the above-described structure, as shown in FIG.
The inner wall pressing portion 22 provided on the jaw 21 is inserted into the inside of the pipe from the end of the single pipe 6 driven into the soil so that the edge of the single pipe 6 abuts against the bottom of the jaw 21. Install. At this time, since the guide member 20 disposed on the single pipe 6 is stationary, the inner wall pressing portion 2 of the guide member 20
The distance between 2 and the outer wall pressing portion 42 of the gripping member 40 changes according to the position of the main member 10 as described above. That is, when the main member 10 moves upward, the distance between the inner wall pressing portion 22 of the guide member 20 and the outer wall pressing portion 42 of the gripping member 40 becomes narrower, while the main member 10 is located on the lower side. In these distances spread.

Before the pulling of the single pipe 6, the upward tension is not applied to the wire 12 connected to the ring 11 of the main member 10, so that the main member 10 is moved by its own weight in the direction of the second rotating shaft 2. Therefore, the distance between the inner wall pressing portion 22 of the guide member 20 and the outer wall pressing portion 42 of the gripping member 40 is sufficiently widened. Thereby, the inner wall pressing portion 22 of the guide member 20 can be easily installed in the single pipe 6.

Next, when the wire 12 connected to the ring 11 of the main member 10 is started to be pulled up by a heavy construction machine such as a power shovel, the main member 10 moves upward along the long axis (in the direction of the first rotation axis 1). And two link structures 31,
By the function of 41, the distance between the inner wall pressing portion 22 of the guide member 20 and the outer wall pressing portion 42 of the gripping member 40 becomes smaller. As a result, the inner wall pressing portion 22 of the guide member 20 and the outer wall pressing portion 42 of the gripping member 40 are closed, and the wall surface of the single pipe 6 is gripped.

When the single pipe 6 is detached from the single pipe withdrawing aid of the present invention after the single pipe is pulled out, the main member 10 is moved along the long axis by placing the suspended single pipe 6 on the ground or the like. Decrease the amount of tension that is pulling up along the direction. By doing so, the main member 10 moves in the direction of the second rotating shaft 2 according to its own weight, and the distance between the inner wall pressing portion 22 of the guide member 20 and the outer wall pressing portion 42 of the gripping member 40 increases, The single pipe 6 is automatically removed.

As described above, in the single pipe pipe pulling aid of the present invention, the gripping force corresponding to the magnitude of the pulling force applied from the heavy equipment for construction is applied to the inner wall pressing portion 22 of the guide member 20 and the outer wall of the gripping member 40. This occurs between the pressing portion 42. In the following, the relationship between the pulling force at the start of pulling and the gripping force applied from the outer wall pressing portion 42 to the outer wall of the single pipe 6 will be roughly estimated using the model shown in FIG.

In FIG. 3, the major axis direction of the main member 10 is indicated by a broken line, and the vertical direction is indicated by a chain line. Long axis of main member 10 (broken line) and vertical direction (dashed line)
Θ ₁ , the angle between the major axis (dashed line) of the main member 10 and the major axis (dashed double-dotted line) of the gripping member is θ _2, and the second rotation axis 2 to the fourth rotation axis of the gripping member Distance to 4th and 4th
It is assumed that the distance from the rotating shaft 4 to the tip of the outer wall pressing portion 42 is 6 cm and 3 cm, respectively. When the magnitude of the pulling force for lifting the main member 10 upward is represented by F ₀ , the main member 1
A force having a magnitude of F ₁ = F ₀ × cos θ ₁ acts on each part on 0 along the major axis direction of the main member 10.
Accordingly, it will be pulled upward along the longitudinal direction the second rotary shaft 2 is also the size of the force of F _1. At the start of pulling up, the guide member 20 can be considered to be in a substantially stationary state, so that the gripping member 40 rotates about the fourth rotation shaft 4, and the magnitude of the rotation force F _{2 on} the second rotation shaft 2 at that time is: F ₂ = F ₁ × sin θ ₂ Therefore, at the tip of the outer wall pressing portion 42 of the gripping member 40, F ₃ = 6 /
A torque of 3 × F ₂ is applied.

The major axis (two-dot chain line) of the gripping member 40 and the fourth
The angle between the rotating shaft 4 and the axis (three-dot chain line) connecting the contact point between the outer wall pressing portion 42 and the peripheral surface of the single pipe 6 is θ ₃ , and the coefficient of friction between the outer wall pressing portion 42 and the outer wall of the single pipe 6. Is μ, and the plate thickness of the single pipe 6 is tcm, the magnitude of the component of the rotational force applied from the outer wall pressing portion 42 to the outer wall of the single pipe 6 is
F ₄ = F ₃ × sin θ ₃ Also, the outer wall pressing portion 42
The magnitude of the gripping force F for gripping the single pipe 6 is F = μ
× can be expressed by F _4. Here, cos θ ₃ = 3 /
Since (t + 3), θ ₃ = cos ⁻¹ (3 / (t +
3)), and when these are substituted into the above-described equations and deformed, the magnitude of the gripping force F finally becomes F = 2 × μ × F ₀ × s
inθ ₁ × sin θ ₂ × sin (cos ^-1 (3 / (t +
3))). Here, μ = 0.5, F ₀ = 1
000 kgf, t = 2 cm, θ ₁ = 10 °, θ ₂ = 30
When each numerical value is substituted as °, the magnitude of the gripping force F becomes 394 kgf, and it can be confirmed that the single pipe is gripped by a force of about 40% of the pulling force F ₀ .

At this time, in order to further increase the gripping force applied to the outer wall of the single pipe 6 from the outer wall pressing portion 42, the contact surface of the outer wall pressing portion 42 with the outer wall of the single pipe 6 as shown in FIG. The pipe 6 may be formed into a curved shape that matches the curvature of the peripheral surface. In addition, by engraving an irregular pattern having an anti-slip effect on the contact surface of the outer wall small pressing portion 42 with the outer wall of the single pipe 6, the gripping force applied to the outer wall of the single pipe 6 from the outer wall pressing portion 42 is further increased. can do. Further, the same curved surface processing and non-slip processing can be applied to the contact surface of the inner wall pressing portion 22 with the inner wall of the single pipe 6.

[0023]

As described above, according to the single pipe pipe pulling-out aid of the present invention, the single pipe can be attached and detached much more easily than in the past, so that the pulling per single pipe can be performed. Work time is greatly reduced. Furthermore, according to the single-pipe extraction aid of the present invention, since the single-pipe can be gripped more firmly than in the past, there is no danger of fragment scattering.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a single-pipe extraction aid according to the present invention.

FIG. 2 is a front view showing an example of a use state of the single pipe pipe pull-out aid of the present invention.

FIG. 3 is an explanatory view showing the principle of a single-pipe extraction aid according to the present invention.

FIG. 4 is a cross-sectional view showing a mounted state of the single-pipe extraction aid of the present invention.

FIG. 5 is a bottom perspective view showing an example of a single pipe pipe driving aid.

FIG. 6 is an explanatory view showing a use state of a single pipe pipe driving aid.

FIG. 7 is a perspective view showing an example of a conventional single pipe pipe pull-out aid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st rotating shaft 2 2nd rotating shaft 3 3rd rotating shaft 4 4th rotating shaft 6 Single pipe 10 Main member 11 Ring 12 Wire 20 Guide member 21 Jaw 22 Inner wall pressing part 23 Convex part 30 Connection member 31 Link structure 40 Gripping member 41 Link structure 42 Outer wall pressing part 50 Collar part 51 Support 52 Pipe part 60 Backhoe 70 Clamp piece 71 Hinge 72 Bolt 73 Nut

Claims (3)

(57) [Claims] 1. A main member having a ring for fastening a wire at an upper end, a first rotating shaft and a second rotating shaft provided at an intermediate portion and a lower end, respectively, and an inverted U-shaped member. A guide having a jaw and a convex portion extending upward from the vicinity of the top of the jaw, and having a third rotational axis and a fourth rotational axis at one end of the jaw and an upper end of the convex portion, respectively; A connecting member mounted on the first and third rotating shafts for connecting the main member and the guide member; and a connecting member mounted on the second rotating shaft and the fourth rotating shaft. A gripping member having an outer wall pressing portion at an end on the side where the member and the guide member are connected and connected to the fourth rotary shaft, and a portion between the third rotary shaft and the fourth rotary shaft is provided. The distance is longer than the distance between the first rotation axis and the third rotation axis, and the main member is The inner tube pressing portion provided at the end of the guide member on the side where the fourth rotation axis is not formed and the outer wall pressing portion of the gripping member are closed by being pulled up to a single tube. Pipe pulling aid. 2. The single-pipe pipe according to claim 1, wherein the closed surfaces of the outer wall pressing portion and the inner wall pressing portion are each formed into a curved surface shape corresponding to the curvature of the peripheral surface of the single pipe pipe. Removal aid. 3. The single pipe pipe pulling aid according to claim 1, wherein unevenness of a non-slip is engraved on each surface of the outer wall pressing portion and the inner wall pressing portion to be closed.