JPH0913374A - Device and method for pulling out casing pipe - Google Patents

Abstract

PURPOSE: To improve work efficiency by easily pulling out a casing pipe by providing a large pulling force to greatly shorten a period of time required for a pulling work. CONSTITUTION: A cylidrical hammer holder 14 is connected to the top end of a casing pipe 13 erected in an excavated pit 12 and a pulling head 15 is engaged with the upper end in the hammer holder 14 so as to be mounted thereto. A hammer 16 is inserted into the holder 14 to upwardly strike the head 15. The casing pipe 13 is pulled out through the head 15 and holder 14 by the striking force of the hammer 16. And the head 15 and hammer 16 can be used as an excavation bit of excavation tool and hammer which are used to erect the casing pipe 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing pipe drawing apparatus and a drawing method used for drawing a casing pipe once built in an excavation mine using an excavating tool or the like.

[0002]

2. Description of the Related Art When performing well digging work or foundation work with a drilling tool such as a diameter-expanding bit, a device as shown in FIG. 3 is used. Reference numeral 1 in FIG. 3 denotes a casing pipe built in the excavation mine at the time of such construction.
A digging bit 2 of a digging tool such as a diameter-expanding bit is provided at the tip of the casing pipe 1 so as to be engaged with the casing pipe 1, and compressed into the casing pipe 1 via an air hose 3 from a compressor or the like. A hammer 4 that is driven by air and hits the rear end surface of the excavation bit 2 is built in. Then, the casing pipe 1 is supported by the excavator 5 and the like, and the excavating bit 2 is supported by the hammer 4.
While struck, or in addition to this, while excavating the excavating bit 2, the casing pipe 1 is excavated, whereby the casing pipe 1 is built in the excavation hole 6 excavated by the excavating bit 2. .

By the way, in such well digging work or foundation work, after the digging pit 6 is pierced to a certain extent by the above-mentioned digging tool and the casing pipe 1 is built, for some reason, this built-in casing is used. There may be a case where the pipe 1 has to be pulled out. However, since the casing pipe 1 once built in the digging pit 6 is firmly held in the digging pit 6 by friction with the inner circumference of the digging pit 6 or pressure, it can be simply pulled up by a crane or the like. Then, it is not easy to pull out the casing pipe 1. Therefore, conventionally, in such a case, first, the excavating tool such as the excavating bit 2 and the hammer 4 inserted into the casing pipe 1 is extracted from the casing pipe 1 and removed, and then the vibrator (vibrating device) is suspended. The crane is carried over the excavation mine 6 and this vibrator is used as the casing pipe 1.
The casing pipe 1 is pulled up by a crane while being vibrated by a vibrator,
I was trying to pull it out from.

[0004]

However, in the extraction method using such a vibrator, the casing pipe 1 is vibrated by the vibration force of the vibrator to release the friction and pressure between the excavation shaft 6 and the crane. In order to pull out the casing pipe 1,
The drawing speed cannot be increased so much that the drawing operation requires a relatively long time. In addition, for example, the diameter of the casing pipe 1 is large, or the depth of building in the excavation mine 6 is deep,
When a large amount of frictional force or pressure is applied to the casing pipe 1, the vibration force required for pulling out is also large, so that a large vibrator is required and the time required for pulling out is further prolonged.
Furthermore, in the above-mentioned pulling-out method, a vibrator for vibrating the casing pipe 1 at the time of pulling-out must be prepared, and the work is completely delayed from the time when the pull-out is necessary until the vibrator is arranged and carried in. Therefore, there is also a problem that the time required for the whole drawing operation is further extended.

The present invention has been made under such a background, and even if a case where the casing pipe has to be pulled out occurs, a strong pulling force can be provided easily and more efficiently. An object of the present invention is to provide a casing pipe withdrawing device and an withdrawing method capable of performing an withdrawing operation and reducing the time required for the operation.

[0006]

In order to solve the above problems and to achieve the above object, a drawing device according to claim 1 of the present invention has a tubular shape connected to and held by an upper end of a casing pipe. A hammer holder, a withdrawal head that is fitted into the upper end of the hammer holder and locked to the hammer holder, and a hammer that is inserted into and supported by the hammer holder and strikes the withdrawal head upward It is characterized by In addition, the drawing method according to claim 4 of the present invention, the upper end of the casing pipe,
The lower end of a cylindrical hammer holder incorporating a pull-out head and a hammer that strikes the pull-up head upward is connected, the pull-out head is locked to the hammer holder, and the hammer is struck by the hammer. The casing pipe is pulled out from the pit.

[0007]

According to the pulling device and the pulling method thus constructed, the casing pipe is pulled out together with the hammer holder by hitting the hammer holder connected to the upper end of the casing pipe upward with the hammer through the pulling head. In other words, the casing pipe can be pulled out by a strong striking force with a hammer, as in the case where the casing pipe is being built while drilling a pit. Therefore, compared with the conventional vibration-based extraction using a vibrator, the extraction speed can be significantly increased, and a large extraction force can be obtained, even if a large frictional force or pressure acts on the casing pipe. Even if there is, the casing pipe can be easily withdrawn in a short time without increasing the size of the withdrawal device.

Further, according to the pulling device and the pulling method having the above-mentioned construction, the casing pipe is pulled out by the striking force of the hammer as when the casing pipe is being built up, so that the casing pipe is locked by the hammer holder. As the extraction head that receives the hammering force, it is possible to use the above-mentioned drilling bit of the drilling tool used when building the casing pipe,
As a hammer which gives a striking force to the extraction head, it is possible to use a hammer of an excavating tool which is also used when building a casing pipe. Therefore, if a situation arises when the casing pipe must be pulled out during installation, first pull out the excavation bit and hammer of the excavating tool used for this installation from the casing pipe, then invert them. By attaching to the hammer holder and locking the drill bit, and connecting the lower end of this hammer holder to the upper end of the casing pipe, you can quickly deal with such a situation without waiting for the arrangement and loading of the vibrator as in the past. It becomes possible to perform an efficient extraction work.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the drawing apparatus of the present invention. The extraction device of this embodiment is the same as the surface 11
A cylindrical hammer holder 14 connected to the upper end of the casing pipe 13 to be pulled out built in the digging pit 12, and fitted and attached to the upper end of the hammer holder 14 with respect to the hammer holder 14. The pull-out head 15 is engaged with the hammer 16 and the hammer 16 is inserted in the hammer holder 14 directly below the pull-out head 15. The hammer holder 14 has substantially the same diameter as the casing pipe 13 and is made of the same material as the casing pipe 13 such as a steel pipe, and is welded to the upper end of the casing pipe 13 so as to be coaxial with the axis O of the casing pipe 13. Are joined and connected by. A pair of ears 17, 17 are formed on the outer peripheral surface on the upper end side of the hammer holder 14 so as to be located on opposite sides of the axis O, and these ears 17, 17 are connected to each other. Wire 1
The hammer holder 14 is hung and supported by a crane or the like via 8 and 18.

In the present embodiment, as the extraction head 15 attached to the upper end of the hammer holder 14, in the present embodiment, excavation tools such as a diameter-enlarging bit and a button bit of an excavation tool used when the casing pipe 13 is built in the excavation pit 12 are excavated. Bits are used. Then, such an excavating bit is engaged with the upper end of the hammer holder 14 and is attached upwards, in the same manner as it is attached to the tip of the casing pipe 13 during excavation. Also,
In the present embodiment, the hammer 16 inserted under the extraction head 15 is also the hammer of the excavating tool used when the casing pipe 13 is built in the excavation pit 12 like the extraction head 15. Then, such a hammer 16 is inserted upward into the hammer holder 14 so that its piston is brought into close contact with the lower end surface of the extraction head 15 and is directed upward.

On the other hand, on the outer peripheral surface on the lower end side of the hammer holder 14, a pair of windows 19, 19 penetrating the inner peripheral portion of the cylindrical hammer holder 14 are provided on the opposite sides with the axis O interposed therebetween. It is formed so as to be located. Each of these windows 19, 19 has a rectangular shape formed so as to extend along the axis O direction,
The upper end edge thereof is formed so as to substantially face the lower end of the hammer 16 inserted into the hammer holder 14.
Further, in the pair of arc-shaped plate-shaped portions 20, 20 of the hammer holder 14 defined between the pair of window portions 19, 19,
Reinforced by hardfacing. At the lower end of the hammer 16, there is an L-shaped joint pipe 21 that extends downward in the direction of the axis O and then bends at a right angle and extends from one of the windows 19 and 19 to the outside of the hammer holder 14. The joint pipe 21 is connected by screw fitting. Further, an air hose 22 for supplying compressed air for driving the hammer 16 to the hammer 16 from an air source (not shown) such as an air compressor is connected to the joint pipe 21. There is.

Further, a clamp band (holding member) 23 is attached to the joint pipe 21.
This clamp band 23 is, as shown in FIG.
A pair of half-divided bodies 2 in which flat plate-shaped ears 25, 25 extending in the diametrical direction are provided at both circumferential ends of a cylindrical main body 24.
6 and 26 are combined into a cylindrical shape, and the bolt 2 is inserted into the ears 25 of the half-split bodies 26, 26.
The two halves 26, 26 are made into the main body 2 by 7, 27
The joint pipe 21 is sandwiched between 4 and 24 and is bolted to be integrated.
The hammer 16 is held via the. Furthermore, the ear 2 of the clamp band 23
Wires 28, 28 are passed through 5 and, like the wires 18, 18, by suspending these wires 28, 28 by a crane or the like, the clamp band 23 is connected to the hammer 1 via the joint pipe 21.
It is supported while holding 6 and is vertically movable relative to the hammer holder 14 in the direction of the axis O within the range of the window 20.

Next, the casing pipe 13 built in the excavation pit 12 is constructed by using the pulling device having such a construction.
An embodiment of the pulling method of the present invention when pulling out the will be described. In the present embodiment, when the casing pipe 13 has been built up to some extent in the digging pit 12 and it becomes necessary to pull out the casing pipe 13,
First, the excavation pit 12 is inserted into the casing pipe 13.
The excavation tool used for excavating the above is extracted from the casing pipe 13, the excavation bit at the tip of the excavation tool is directed upward as the extraction head 15, and the hammer 16 is disposed below it so that it can be hit upward, that is, the excavation well 12 is excavated. Place it in the opposite direction as you would. Then, the hammer holder 14 is put on this, and the tip of the hammer holder 14 is locked upward to the extraction head 15 and is connected to the lower end of the hammer 16 through the window 20 through the joint pipe 21. Half-split body 26,2
6 are inserted from the window portion 20 one by one and combined, and the joint pipe 21 is sandwiched and fixed by bolts 27, 27.

Further, the pulling device thus assembled is hung and supported by a crane or the like via the wires 18 and 28, and the lower end of the hammer holder 14 is joined and connected to the upper end of the casing pipe 13 to be pulled out. Then, the hammer holder 1 is used by the crane or the like.
While pulling up 4, the compressed air is supplied from the air hose 22 to the hammer 16 through the joint pipe 21 to drive the hammer 16 and strike the pulling head 15 upward, and the hammer holder locked to the pulling head 15 is driven. 14 and the casing pipe 13 connected to the hammer holder 14 also receive a striking force upward, whereby the casing pipe 13 is gradually extracted from the excavation pit 12 and rises. Therefore, this casing pipe 1
The casing built in the digging pit 12 by continuing to hit with the hammer 16 while keeping the state in which the wires 18, 28 are lifted by a crane or the like and the hammer holder 14 is supported in accordance with the rise of the hammer holder 14 and the hammer holder 14. It becomes possible to pull out the pipe 13.

However, according to the device for withdrawing the casing pipe 13 having such a structure and the withdrawing method using the device, the hammer 16 is used to strike the casing pipe 13 when the casing pipe 13 is built as the excavation pit 12 is excavated. Since the casing pipe 13 is pulled out by the force, compared to the case where the casing pipe is pulled out by using the vibration force of the conventional vibrator, it is possible to obtain a strong impacting pulling force, which significantly reduces the time required for pulling out. It is possible to shorten the time. In addition, since the same strong pull-out force by impact can be obtained as in the case of building the casing pipe 13 in this way,
Even if the casing pipe 13 is deeply built or the casing pipe 13 has a large diameter and a large frictional force or pressure is applied to the casing pipe 13, the pulling out can be performed easily and in a short time. It will be possible.

Further, in addition to these, in the present embodiment, a pulling head 15 and a hammer 16 for applying a striking force to the casing pipe 13 via the hammer holder 15 are used when the casing pipe 13 is built in the excavation pit 12. The drill bit and the hammer of the drilling tool to be used can be diverted as they are. Therefore, in the case that the casing pipe 13 has to be pulled out, the drilling of the drilling tool inserted in the casing pipe 13 is performed. Pull out the bit and hammer 16 and leave them as they are.
5 and hammer 16. Therefore, as compared with the conventional arrangement where a vibrator is arranged and carried in and installed after it is necessary to pull out, it is possible to significantly reduce the time until the pulling out work is performed, and the work efficiency is further improved. At the same time, it is not necessary to prepare a vibrator or the like in the first place, and it is possible to promote simplification of the equipment to be owned.

In this embodiment, however, the bit and the hammer of the excavating tool can be used as the extraction head 15 and the hammer 16 as described above. However, the head 15 and the hammer 16 dedicated to the extraction device are attached to the hammer holder 14 in advance. Of course, it does not matter if it is set. Further, in the present embodiment, the hammer holder 14 is joined to the casing pipe 13 by welding, but if the strength against the pulling force due to the striking at the time of pulling out can be secured, the both are joined by screw fitting, for example. Alternatively, they may be connected via a connecting member such as a coupling.

[0018]

As described above, according to the present invention,
With a hammering force similar to that used when building a casing pipe in a digging hole, a strong pulling force can be obtained to easily pull out the casing pipe. Also in the pulling out, it is possible to greatly reduce the time required for the pulling out work and promote the efficiency of the work.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a drawing device of the present invention.

FIG. 2 is a plan view of a clamp band (holding member) 23 of the embodiment shown in FIG.

FIG. 3 is a diagram showing a well digging work and a foundation work for building a casing pipe using a drilling tool.

[Explanation of symbols]

 13 Casing Pipe 14 Hammer Holder 15 Extraction Head (Excavation Bit) 16 Hammer 19 Window 21 Joint Pipe 23 Clamp Band (Holding Member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyoshi Yoshida 1528, Nakashinda, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture Mitsubishi Materials Corporation Gifu Factory

Claims (5)

[Claims] 1. A casing pipe withdrawing device used for withdrawing a casing pipe built in an excavation pit, comprising a cylindrical hammer holder connected to and held at an upper end of the casing pipe, and inside the hammer holder. And a hammer that is inserted into the upper end of the hammer holder and is locked to the hammer holder, and a hammer that is inserted into and supported by the hammer holder and that strikes the withdrawal head upward. Pipe withdrawal device. 2. The pulling head and the hammer are
The casing pipe withdrawing apparatus according to claim 1, wherein the casing pipe is a bit and a hammer of an excavating tool used when building the casing pipe. 3. A window member is formed in the lower portion of the hammer holder, the window member opening to the outer peripheral surface of the hammer holder, and a holding member for holding the hammer in a position facing the window portion in the hammer holder. 3. The casing pipe according to claim 1, wherein the holding member is supported through the window portion so as to be vertically movable relative to the hammer holder. Pulling device. 4. A lower end of a cylindrical hammer holder having a pulling head and a hammer for striking the pulling head upwardly is connected to an upper end of a casing pipe built in an excavation pit, and the pulling head is connected to the pulling head. A casing pipe withdrawing method, characterized in that the casing pipe is locked by a hammer holder and hit by the hammer, and the impact force causes the casing pipe to be withdrawn from the excavation hole via the hammer holder. 5. The method for extracting a casing pipe according to claim 4, wherein a bit and a hammer of an excavating tool used when building the casing pipe are used as the extracting head and the hammer.