JP2002070469A - Casing excavation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a casing excavation method allowing one easing to cope with both a soft ground layer and a hard ground layer by enabling a construction period to be shortened on the strength of the efficient discharge of sediment in the soft ground layer and permitting the sediment to be discharged by means of a construction tool for the hard ground layer in the hard ground layer. SOLUTION: In the soft ground layer, a rotary drive mechanism 32 for rotating a kelly-bar 22 is supported on the boom 14 of a crane 4 so as to be able to retreat, and a bucket 40 is mounted on the end of the kelly-bar 22 suspended with the crane 4 and inserted into a casing tube 2 in order to discharge the sediment. In the hard ground layer, a hammer grab 18 is suspended with the crane 4 in the retreat state of the mechanism 32 for the purpose of discharging the sediment within the casing tube 2. In the movement of a tubing mechanism 1, the tubing mechanism 1 is suspended and moved with the crane 4 in such a state as to remove the kelly-bar 22 so as to allow the mechanism 32 to retreat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a steel casing,
Pushing the so-called casing tube (hereinafter referred to as “casing tube”) such as steel pipe pile or PC pipe into the ground while rotating or oscillating, discharging the sediment in the casing tube, and constructing a pile inside, or rock or cobblestone The present invention relates to a casing excavation method used in an all-casing method for removing and replacing casing soil with good-quality soil and extracting and collecting a casing tube.

[0002]

2. Description of the Related Art Conventionally, in the so-called all-casing method, a casing tube is pushed into the ground while being rotated or rocked by a tubing mechanism, and the earth and sand in the casing tube is discharged. Since a hard ground layer such as a rock or a boulder may be interposed in the ground, a tool for the hard ground layer is used when discharging the earth and sand in the casing tube.

[0003] Hammer grabs, down-the-hole hammers and the like are known as tools for hard ground formation. For example, when a hammer glove is used, the hammer glove suspended by a crane is lowered into a casing tube, sediment is grabbed by the hammer glove, and the hammer glove is lifted outside.

After the work at one location is completed, the tubing mechanism is lifted by a crane and moved to the next construction location.

[0005]

However, according to such a conventional method, when excavating a hard ground layer using a casing tube, it is necessary to discharge internal soil, particularly rocks, etc. by a hammer glove. Since the amount of earth removal per hammer grab is small, the construction period is greatly affected by the efficiency of internal earth and sand discharge. In particular,
When excavating a soft ground layer using a casing tube, there is a problem that the hammer grab is not effective in discharging earth and sand. The same applies to the case of using a tool for a hard ground layer other than a hammer grab.

An object of the present invention is to provide a casing excavation method capable of efficiently discharging earth and sand in a soft ground layer.

[0007]

In order to achieve the object, the present invention takes the following method to solve the problem. That is, while rotating or swinging the casing tube by the tubing mechanism and pushing it into the ground, the tool for the hard ground formation suspended from the crane is lowered into the casing tube, and the casing is hardened by the tool for the hard ground formation. In a casing excavation method for discharging soil in a tube, in a soft ground layer, a rotation drive mechanism for rotating a kelly bar is supported by a boom of the crane, and a bucket is attached to a tip of the kelly bar suspended from the crane, And discharging the earth and sand in the casing tube by discharging the earth and sand in the casing tube by suspending the application tool for the hard ground layer on the crane in the hard ground formation. That is it.

The rotary drive mechanism is supported so as to be retractable, and in the hard ground layer, the tool for the hard ground layer is suspended from the crane in a state where the rotary drive mechanism is retracted, and the casing tube is hung. The earth and sand inside may be discharged. Alternatively, in the hard ground formation,
In a state where the rotary drive mechanism is retracted while the kelly bar is suspended, the application tool for the hard ground layer may be suspended from the crane to discharge earth and sand in the casing tube. Furthermore, when the tubing mechanism is moved, the tubing mechanism may be suspended by the crane and moved while the rotary drive mechanism is retracted. Further, the tool for forming a hard ground layer may be a hammer grab.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a tubing mechanism. The tubing mechanism 1 grips the outer periphery of the casing tube 2 to rotate or swing the casing tube 2, and pushes down the casing tube 2 in the axial direction to move the casing tube 2 downward. It is of a known configuration that can be pushed into the ground. A plurality of drill bits (not shown) are attached to the tip of the casing tube 2.

Reference numeral 4 denotes a crane on which first to fifth five winches 6 to 10 are mounted. In the present embodiment, FIG.
As shown in FIG. 1, first to third winches 6 to 8 and a fifth winch 10 are mounted on a crane main body 12, and a fourth winch 9 is mounted on a boom 14. The wire 16 pulled out from the first winch 6 is fastened to a hammer rub 18 as a tool for hard ground formation. Second
The wire 20 pulled out of the winch 7 is
Is fastened to the upper end.

The wire 2 pulled out of the third winch 8
A hook 26 is attached to 4. The wire 28 pulled out from the fourth winch 9 is used for suspending the hammer crown 29 of the hammer club 18, and the hook of the hammer club 18 is opened and closed by winding and feeding the wire 28. Wire 30 pulled out from fifth winch 10
Is fastened to the tip of the boom 14, and the boom 14 is raised and lowered by winding and feeding out the wire 30.

The boom 14 supports a rotation drive mechanism 32 for rotating the kerry bar 22. Rotary drive mechanism 3
2 drives the rotation of the keriba 22 and the keriba 22
Can be slid in the axial direction. Both ends of a link member 34 are swingably connected to the boom 14 and the rotation drive mechanism 32, respectively.
Further, a first cylinder 36 is provided between the crane main body 12 and the link member 34, and a second cylinder 38 is provided between the rotation drive mechanism 32 and the boom 14. By driving the first cylinder 36 and the second cylinder 38, the rotary drive mechanism 32 can be retracted. It should be noted that the configuration that can be evacuated may be selected as needed.

That is, as shown in FIG.
2 can be moved to a retracted position closer to the boom 14 side, and as shown in FIG.
Is configured to be able to be moved to the earth discharging position where the kelly bar 22 inserted into the vertical position becomes vertical.

A bucket 40 can be detachably attached to the tip of the kelly bar 22. By rotating the kelly bar 22, the earth and sand excavated by the bucket 40 can be taken into the inside. Hamakurabu 1
More than 8, but not suitable for digging hard ground layers such as hard rock formations.

Next, the operation procedure of the rotary excavation using the casing tube 2 using the above-described apparatus will be described. First, as shown in FIG. 1, the outer periphery of the casing tube 2 is gripped by the tubing mechanism 1 and
Causes the casing tube 2 to rotate. At the same time, the casing tube 2 is pushed down in the axial direction by the tubing mechanism 1 and pushed into the ground while excavating. Since the casing tube 2 is formed hollow, earth and sand remains in the casing tube 2.

When the casing tube 2 is excavating the soft ground, as shown in FIG. 2, the first cylinder 36 and the second cylinder 38 are driven to rotate the rotary drive mechanism 32.
Is moved to the earth discharging position, and the kelly bar 22 is moved vertically. Then, a bucket 40 is attached to the tip of
Is mounted, the crane 4 is moved to move the bucket 40 right above the casing tube 2, and the second winch 7 is driven to pay out the wire 20.

As a result, the bucket 40 is inserted into the casing tube 2, and the bucket 40 is rotated by the rotary drive mechanism 32 via the kelly bar 22. Bucket 4
0 excavates the earth and sand in the casing tube 2 and takes in the excavated earth and sand into the bucket 40.

When the inside of the bucket 40 is full of earth and sand, the second winch 7 is driven to wind up the wire 20 and the bucket 40 is pulled out of the casing tube 2. Then, after discharging the earth and sand to the outside, the bucket 40 is again inserted into the casing tube 2 to take the earth and sand into the bucket 40. Since the amount of soil removed per time of the bucket 40 is large, the earth and sand in the casing tube 2 can be efficiently discharged.

When the casing tube 2 hits a hard ground layer such as a boulder or a hard rock layer, the bucket 40 cannot excavate.
Is pulled out to remove it from the Keriba 22. Then, the first cylinder 36 and the second cylinder 38 are driven to move the rotary drive mechanism 32 to the retracted position,
2 is drawn to the boom 14 side. As shown in FIG. 1, the hammer club 18 is suspended from the wire 16 of the first winch 6, and the hammer crown 29 is attached to the wire 28 of the fourth winch 9.

When the kelly bar 22 is hung by the wire 16 of the first winch 6 and the hanger club 18 is hung, it may be replaced. Or the fourth
Instead of the wire 28 of the winch 9, the hammer crown 29 may be hung by the hook 26 attached to the wire 24 of the third winch 8. As a result, four winches are required. Further, the wire 16 of the first winch 6 is used to
2 and the hammer club 18 may be replaced and hung, the hook 26 may be attached to the wire 20 of the second winch 7 and the hammer crown 29 may be hung. In this case, three winches are required.

Then, the hammer club 18 is moved right above the casing tube 2, and the wire 16 is fed out from the first winch 6, and the hammer club 18 is lowered. When the hard ground layer is crushed by the lowered hamag lab 18 and the first winch 6 is driven to wind up the wire 16, the claws of the ham mag club 18 are closed and the crushed earth and sand is taken in.

The first winch 6 is driven to drive the hammer club 1
8 is lifted out of the casing tube 2 and connected to the hammer crown 29 suspended by the wire 28 of the fourth winch 9 to drive both winches.
The claws of the hammer club 18 are opened to discharge the earth and sand inside. Then, the hammer club 18 is lowered again to take in the crushed earth and sand. By repeating this, the casing tube 2
Drain the soil inside.

For example, when the casing tube 2 penetrates a boulder and excavates a soft ground layer again, the hammer club 18 is removed from the wire 16 and the bucket 40 attached to the kelly bar 22 is used to remove the inside of the casing tube 2 in the same manner as described above. Discharge of earth and sand. Thus, when the casing tube 2 reaches the predetermined depth, the excavation by the casing tube 2 ends. Thereafter, the pile is constructed in the same manner as the ordinary all casing method, and the construction of one pile is completed.

Then, at the next location, the casing tube 2
As shown in FIG. 3, when excavation is performed, the hamburger 18 and the bucket 40 are removed, and the kelly bar 22 is removed from the rotation drive mechanism 32, and the tubing mechanism 1 is attached by the hook 26 attached to the wire 24 of the third winch 8.
And move to the next excavation point. Note that the kelly bar 22 may be kept suspended if there is enough suspension capacity.

As described above, the earth and sand in the casing tube 2 can be removed by one crane 4 when the ground is soft ground.
It is discharged by the bucket 40, and in the case of a hard ground stratum,
It is discharged by the hammer rub 18. Therefore, in a soft ground stratum, the excavation efficiency is improved because the water is discharged by the bucket 40. Further, since the tubing mechanism 1 is moved by the same crane 4, the above-mentioned operation can be performed by one crane 4, and no other operation machine is required, so that a large operation space is not required.

The present invention is not limited to such an embodiment at all, and can be implemented in various modes without departing from the gist of the present invention.

[0027]

As described above in detail, in the casing excavating method of the present invention, when the soil in the casing tube is in soft ground, the excavation efficiency is improved, the construction period is shortened, and the construction cost is reduced. Can be reduced. Further, in the case of a hard ground stratum, since the material is discharged by the tool for the hard ground stratum, there is an effect that one crane can cope with both the soft ground stratum and the hard ground stratum.

Further, when the tubing mechanism is moved by the same crane, the work can be performed by one crane and there is no need to replace the work machine with another work machine. Therefore, a large work space is not required. It does not cause heavy machinery accidents and disasters that occur during replacement work, improves safety, shortens the construction period, and reduces construction costs.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a state where earth is discharged by a hammer rub in a casing excavation method as one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which soil is discharged by a bucket in the casing excavation method of the present embodiment.

FIG. 3 is an explanatory diagram showing a state in which a tubing mechanism is moved by a crane in the casing excavation method of the present embodiment.

FIG. 4 is an explanatory view showing the arrangement of each winch of the crane used in the casing excavation method in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tubing mechanism 2 ... Casing tube 4 ... Crane 6 ... 1st winch 7 ... 2nd winch 8 ... 3rd winch 9 ... 4th winch 10 ... 5th winch 14 ... Boom 18 ... Hammagrub 22 ... Keriva 26 ... Hook 32 ... Rotation drive mechanism 36 first cylinder 38 second cylinder 40 bucket

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Akira Iwakura 1-1-1, Sanbonmatsucho, Atsuta-ku, Nagoya-shi, Aichi Japan Vehicle Manufacturing Co., Ltd. (72) Inventor Takashi Takemoto 7-2 Nagiriyamacho, Amagasaki-shi, Hyogo Prefecture Takemoto Basic Construction Co., Ltd. (72) Inventor Hitoshi Matsunaga 7-2 Nagiriyama-cho, Amagasaki City, Hyogo Prefecture Takemoto Basic Construction Co., Ltd. F-term (reference) 2D029 DC01 PA07 PB05 PC01 PD02 2D050 AA07 CB10 CB23 EE14

Claims (5)

[Claims] The tubing mechanism rotates and swings a casing tube into the ground while pushing it into the ground, and lowers a hard ground formation tool suspended by a crane into the casing tube to lower the hard ground formation tool. In the casing excavation method for discharging earth and sand in the casing tube, in a soft ground stratum, a boom of the crane supports a rotary drive mechanism for rotating a kelly bar, and a bucket is attached to a tip of the kelly bar suspended from the crane. Inserting the bucket into the casing tube to discharge earth and sand; and in the hard ground formation, hanging the tool for the hard ground formation on the crane to discharge the earth and sand in the casing tube. Casing drilling method. 2. The hard tube forming apparatus according to claim 1, wherein said rotary drive mechanism is removably supported, and said hard ground formation tool is suspended from said crane in said hard ground formation while said rotary drive mechanism is retracted. The casing excavation method according to claim 1, wherein the earth and sand in the inside are discharged. 3. In the hard ground formation, the tool for the hard ground formation is suspended by the crane in a state where the rotary drive mechanism is retracted while suspending the keriba, and sediment in the casing tube is removed. The casing excavating method according to claim 2, wherein the casing is excavated. 4. The casing according to claim 1, wherein, when the tubing mechanism is moved, the tubing mechanism is suspended and moved by the crane while the rotary drive mechanism is retracted. Drilling method. 5. The casing excavating method according to claim 1, wherein the tool for forming a hard ground layer is a hammer grab.