JP2001073663A - First tube for all-casing construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a first tube for all-casing construction, capable of marked improvement in cutting performance and exact cutting, and reduction in working time and cost. SOLUTION: This first tube for all-casing construction 3, mounted onto the front end of a casing tube by means of an all-casing construction method, is provided with a plurality of types of cutter bits 4 whose cutting radii are different from each other, on the front end of its body part. One type of the plurality of types of cutter bits 4 is mounted so as to be ahead of the other types.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a first tube used in an all-casing method.

[0002]

2. Description of the Related Art FIG. 6 is an explanatory view showing a working state of an all casing method in foundation pile formation and standing pile formation.
In the figure, 1 is an all-casing excavator, and 2 is a casing tube that presses into the ground while maintaining a hole wall.

The casing tube 2 is connected in multiple stages with the excavation. At the lowest stage, a first tube 3 having a cutter bit 4 attached to the lower end is attached.

[0004] The casing tube 2 is rotated by the all-casing excavator 1, and the ground, rock and obstacles are circumferentially cut by the cutter bit 4 of the first tube 3, and the inside thereof is suspended by the casing tube 2. Excavated by the bucket 5 or the like.

FIG. 7 is a perspective view of the first tube 3. 7, reference numeral 6 denotes an upper casing tube 2.
A male joint connected to the lower end of the body, 7 is a cylindrical body,
Reference numeral 4 denotes a cutter bit to which the lower edge 7a of the body 7 is attached and which cuts ground, rock, obstacles and the like.

The male joint 6 is fitted to the lower end of the casing tube 2 to be connected, and is fixed by a lock pin 6a, and the multistage casing tubes 2 are similarly connected.

[0007] The cutter bit 4 is a first tube 3
There are a plurality of types having different cutting radii, ie, different cutting radii, by the rotation of the first tube 3, and these are attached to the lower end edge 7 a of the body 7 of the first tube 3.

FIG. 8 is a bottom view of the first tube 3 as viewed in the direction of arrow A in FIG. 7, and illustrates the arrangement of a plurality of types of cutter bits 4 having different cutting radii.

In FIG. 8, among the plurality of types of cutter bits 4 having different cutting radii, 4a is an outer cutter bit for cutting the outer periphery of the body 7, and 4b is cutting the inner periphery of the body 7. The inner cutter bit 4c is a middle cutter bit for cutting the outer periphery and the center of the inner periphery of the body portion 7. The outer cutter bit 4a and the middle cutter cutter are provided at the lower end edge 7a of the body portion 7 of the first tube 3. The bit 4c and the inner cutter bit 4b are sequentially spaced from each other, as shown in FIG.
It is inserted into a U-shaped concave portion provided in a and attached by an appropriate fixing method such as welding.

FIG. 9 is an explanatory view of a state in which the cutter bit 4 is attached to the conventional first tube for the all-casing method. FIG. 9 is a cross-sectional view taken along the line BB of FIG. 8, but the cutter bits 4a, 4c, and 4b are set downward. , And each cutter bit is illustrated in the same cross section.

FIG. 10 is an explanatory view of another example of a state of attachment of a conventional cutter bit, which is a first tube 3 of a type for cutting soft rock or the like, wherein an outer cutter bit 4a and an inner cutter bit 4 are used as cutter bits 4. This is similar to FIG. 9 except that only the bit 4b is attached.

Normally, when cutting soft rock or earth and sand ground, the outer cutter / inner cutter bit shown in FIG. 10 is used. For cutting hard rock, obstacles, etc., the outer cutter, middle cutter, and inner cutter shown in FIG. 9 are used. The blade cutter bit mounting type is used, but the mounting of the middle blade cutter bit 4c is performed using three types of cutter bits 4a,
4b and 4c share the life of the cutter bit,
Effective for improving machinability.

[0013]

Generally, as shown in FIGS. 9 and 10, in the first tube 3, as the cutter bit 4, a plurality of types of cutter bits 4a, 4b and 4c or 4a having different cutting radii are used. If the cutting width (W) is not wider than the thickness (T) of the body 7, the body 7 cannot be fitted.

However, in recent years, construction conditions have become versatile, and cutting of ultra-hard rock, obstacles containing steel bars and steel plates, steel plates, etc.
In the case of wide cutting, slip occurs on the cutting surface of the cutter bit 4 to cause poor cutting, enlargement of the excavation outer diameter (R1) due to side slip, reduction of the excavation inner diameter (R2), and excavation outer diameter (R1) and excavation inner diameter ( There were problems such as deviation of the predetermined excavation center radius during R2). For this reason, the workability becomes very poor,
For example, in some cases, the actual outer diameter of the excavation is increased by 3 to 5%, which has been a problem.

The present invention solves the above-mentioned problems in the conventional first tube for an all-casing method, and enables a significant improvement in cutting performance and accurate cutting, thereby shortening the construction time and reducing the construction cost. It is an object to provide a first tube for a construction method.

[0016]

Means for Solving the Problems (1) The present invention has been made to solve the above-mentioned problems, and as a first means, a first tube for an all casing method which is attached to a tip of a casing tube by an all casing method. In the first tube for the all casing method, a plurality of types of cutter bits having different cutting radii are provided at the tip edge of the body portion, and one type of the plurality of types of cutter bits precedes other types of bits. It is intended to provide a first tube for an all-casing method, wherein the first tube is attached in such a manner as to be mounted in a manner as described above.

That is, according to the first means, the cutting surface is shared by a plurality of types of cutter bits having different cutting radii, so that the service life of the cutter bit can be extended and the cutting property can be improved.
When cutting ultra-hard rock, obstacles with rebars / steel plates, steel plates, etc., the leading type of cutter bit in the cutting bites into the cutting surface first, and it cuts ahead as a guide, Cutting without side slip can be performed without center run-out, the cutting area of other types of cutter bits is reduced, cutting performance such as cutting speed is greatly improved, and the surrounding ground is not disturbed because accurate holes can be drilled.

(2) Further, as a second means, in the first tube for the all-casing method of the first means, the plurality of kinds of cutter bits are used for cutting the outer periphery of the body, and the inner cutter is used for cutting. A first tube for an all casing method, comprising: an inner blade cutter bit for cutting; and a middle blade cutter bit for cutting the outer periphery and the center of the inner periphery, wherein the kind of cutter bit is the middle blade cutter bit. Is what you do.

According to the second means, in addition to the action of the first means, the cutting surface is shared by three types of cutter bits having different cutting radii: an outer cutter bit, an inner cutter bit and a middle cutter bit. In addition, since the middle cutting bit performs cutting in advance, a hole with an accurate drilling center radius can be drilled, and it is more suitable for cutting ultra-hard rock, obstacles containing steel bars and steel plates, steel plates, and the like.

(3) As a third means, in the first tube for the all casing method of the first means,
The plurality of types of cutter bits include an outer cutter bit for cutting the outer periphery of the body portion, an inner cutter bit for cutting the inner periphery, and a middle cutter bit for cutting the center of the outer periphery and the inner periphery. Wherein the cutter bit is the outer cutter bit described above.

According to the third means, in addition to the function of the first means, the cutting surface is shared by three types of cutter bits having different cutting radii: an outer cutter bit, an inner cutter bit and a middle cutter bit. In addition, since the outer cutter bit performs cutting in advance, it is possible to excavate a hole having an accurate excavation outer diameter, and it is more suitable for cutting an ultra-hard rock, an obstacle containing a reinforcing steel bar and a steel plate, a steel plate, and the like.

(4) As a fourth means, in the first tube for the all casing method of the first means,
The plurality of types of cutter bits include an outer cutter bit for cutting the outer periphery of the body portion, an inner cutter bit for cutting the inner periphery, and a middle cutter bit for cutting the center of the outer periphery and the inner periphery. Wherein the cutter bit is the above-mentioned inner cutter bit.

According to the fourth means, in addition to the operation of the first means, the cutting surface is shared by three types of cutter bits having different cutting radii: an outer cutter bit, an inner cutter bit and a middle cutter bit. Since the inner cutter bit performs cutting in advance, it is possible to excavate a hole with a particularly accurate inside diameter, and it is more suitable for cutting an ultra-hard rock, an obstacle containing a reinforcing steel bar and a steel plate, a steel plate, and the like.

(5) As a fifth means, in the first tube for the all casing method of the first means,
The plurality of kinds of cutter bits include an outer cutter bit for cutting an outer periphery of the body portion and an inner cutter bit for cutting an inner periphery, and the one kind of cutter bit is the outer cutter bit. This is to provide a first tube for an all casing method.

According to the fifth means, in addition to the function of the first means, the cutting surface is shared by two types of cutter bits, ie, an outer cutter bit and an inner cutter bit having different cutting radii. In addition to cutting in advance, drilling holes with the exact outer diameter can be drilled, and it can be applied to ultra-hard rock, obstacles containing steel bars and steel plates, steel plates, etc. Becomes

(6) As a sixth means, in the first tube for the all casing method of the first means,
The plurality of kinds of cutter bits include an outer cutter bit for cutting an outer periphery of the body portion and an inner cutter bit for cutting an inner periphery, and the one kind of cutter bit is the inner cutter bit. This is to provide a first tube for an all casing method.

According to the sixth means, in addition to the function of the first means, the cutting surface is shared by two types of cutter bits, an outer cutter bit and an inner cutter bit having different cutting radii. In addition to cutting in advance, it is possible to drill holes with an accurate drilling inner diameter, and it can be applied to ultra-hard rock, obstacles containing steel bars and steel plates, steel plates, etc. Become.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a main part of a first tube for an all-casing construction method of a leading type with a middle blade cutter bit attached with an outer blade, a middle blade, and an inner blade cutter bit according to a first embodiment of the present invention. Will be described. FIG. 1 is an explanatory view of an attached state of the cutter bit 4 similar to FIGS. 9 and 10 described in the conventional example, and corresponds to a cross section taken along the line BB of FIG. The blade cutter bit 4c and the inner blade cutter bit 4b are illustrated in the same cross section.

The outer cutter bit 4a, the middle cutter bit 4c, and the inner cutter bit 4 having different cutting radii shown in FIG.
b is attached to the lower end edge 7a of the body part 7 of the first tube 3 as a cutter bit 4 at intervals in the same manner as shown in FIG. 8, and is provided at the lower end edge 7a as shown in FIG. It is inserted into the U-shaped concave portion and fixed by an appropriate fixing method such as welding.

The above points are the same as those described in FIGS. 7 and 8 in this embodiment and other embodiments described later, and therefore, description thereof will be omitted.

In this embodiment, an outer cutter bit 4a and an inner cutter bit 4b having different cutting radii are attached to the lower end edge 7a of the body 7 of the first tube 3 as cutter bits 4 at the same level. The blade cutter bit 4c is attached in advance.

Here, "attached in advance"
1 means that it protrudes from the other in the excavation direction, that is, the downward direction in FIG. 1, and means that it is installed so as to bite into the excavation surface below.

Although the cutter bit 4 excavates while rotating the first tube 3, the order of the various cutter bits 4a, 4c and 4b in the rotating direction is not particularly limited, and the cutter bit 4 is appropriately arranged according to the excavation conditions. 1 and FIGS. 2 and 3 according to an embodiment to be described later, the outer cutter bit 4a, the middle cutter bit 4c, and the inner cutter bit 4b in the rotation direction.
4 and 5, the outer cutter bit 4a and the inner cutter bit 4b are mounted in the rotation direction in this order.

In the present embodiment configured as described above, when cutting a super-hard rock mass, an obstacle containing a reinforcing bar or a steel plate, a steel plate, etc., the leading middle blade cutter bit 4c bites in first, and cuts into the inside. The cutting is performed by the blade cutter bit 4c serving as a guide.

Therefore, the first tube 3 of the first embodiment of the first embodiment, in which the outer cutter, the middle cutter and the inner cutter bit are mounted, has the following functions and effects. (1) Since the middle blade bit 4c bites in first and serves as a guide to perform cutting, cutting without side slip and center runout can be performed. (2) Since the middle blade cutter bit 4c cuts in advance,
The cutting area of the outer cutter bit 4a and the inner cutter bit 4b is reduced, and the cutting performance (cutting speed) is greatly improved. (3) Holes with no center run-out, especially with the exact radius of the excavation center, can be excavated, so that the surrounding ground is not disturbed. Since the casting is performed and the casing tube 2 is pulled out, the amount of ready-mixed concrete used in forming the foundation pile is reduced.

As described above, according to the first tube for an all-casing method according to the present embodiment, the cutting performance can be greatly improved and accurate cutting can be performed, so that the construction time can be reduced and the construction cost can be reduced.

FIG. 2 shows a main part of an outer blade cutter bit leading type all-casing method first tube to which an outer blade, a middle blade and an inner blade cutter bit according to a second embodiment of the present invention are attached. FIG. 2 is an explanatory view similar to FIG. 1 illustrating the first embodiment, and the same parts as those described in the first embodiment are omitted, and different points will be mainly described.

In this embodiment, an inner cutter bit 4b and a middle cutter bit 4c having different cutting radii are attached to the lower edge 7a of the body 7 of the first tube 3 as cutter bits 4 at the same level. The blade cutter bit 4a is mounted in advance.

Therefore, when cutting an ultra-hard rock, an obstacle containing a reinforcing steel bar or a steel plate, a steel plate, etc., the leading outer cutter bit 4a bites first and the outer cutter bit 4a.
Is used as a guide for cutting.

Therefore, the outer blade of the second embodiment,
The first tube 3 of the outer blade cutter bit leading type with the middle blade and inner blade cutter bits mounted thereon has the following operations and effects. (1) Since the outer cutter bit 4a bites in at the forefront and serves as a guide to perform cutting, cutting without side slip and center runout can be performed. (2) Since the outer cutter bit 4a cuts in advance,
The cutting area of the inner cutter bit 4b and the middle cutter bit 4c is reduced, and the cutting performance (cutting speed) is greatly improved. (3) Since a hole with no center runout, particularly an accurate hole with an excavation outer diameter (R1) can be excavated, the surrounding ground is not disturbed, and a foundation pile is inserted into the casing tube 2 after excavation to a predetermined depth. Since the ready-mixed concrete is cast and the casing tube 2 is pulled out, the amount of ready-mixed concrete used for foundation pile formation is reduced.

As described above, according to the first tube for an all-casing method of the present embodiment, the cutting performance can be greatly improved and accurate cutting can be performed, so that the construction time can be reduced and the construction cost can be reduced.

FIG. 3 shows a main part of an all-cutter construction first tube of an inner cutter bit advance type having an outer cutter, a middle cutter and an inner cutter bit according to a third embodiment of the present invention. FIG. 3 is an explanatory diagram similar to FIG. 1 illustrating the first embodiment, and the same parts as those described in the first embodiment are omitted, and different points will be mainly described.

In this embodiment, an outer cutter bit 4a and a middle cutter bit 4c having different cutting radii are attached to the lower end edge 7a of the body 7 of the first tube 3 as cutter bits 4 at the same level. The blade cutter bit 4b is mounted in advance.

Therefore, when cutting a super-hard rock, an obstacle containing a reinforcing steel bar or a steel plate, a steel plate, etc., the leading inner cutter bit 4b bites first and the inner cutter bit 4b is cut.
Is used as a guide for cutting.

Therefore, the outer blade of the third embodiment,
The first tube 3 of the leading type with the inner cutter bit having the inner cutter bit and the inner cutter bit attached thereto has the following functions and effects. (1) Since the inner cutter bit 4b cuts into the forefront and serves as a guide to perform cutting, cutting without side slip and center runout can be performed. (2) Since the inner cutter bit 4b cuts first,
The cutting area of the outer cutter bit 4a and the middle cutter bit 4c is reduced, and the cutting performance (cutting speed) is greatly improved. (3) Since a hole with no center runout, in particular, an accurate hole with an excavation inner diameter (R2) can be excavated, the surrounding ground is not disturbed, and a foundation pile is formed by inserting a reinforcing rod cage into the casing tube 2 after excavation to a predetermined depth. Since the fresh concrete is cast and the casing tube 2 is pulled out, the amount of the fresh concrete used at the time of forming the foundation pile is reduced.

As described above, according to the first tube for an all-casing method according to the present embodiment, the cutting performance can be greatly improved and accurate cutting can be performed, so that the construction time can be reduced and the construction cost can be reduced.

FIG. 4 shows a main part of a first tube for an all-casing method of an outer cutter bit leading type equipped with an outer cutter and an inner cutter bit according to a fourth embodiment of the present invention. FIG. 4 is an explanatory diagram similar to FIG. 1 illustrating the first embodiment, and the same parts as those described in the first embodiment are omitted, and different points will be mainly described.

In the present embodiment, an outer cutter bit 4a and a middle cutter bit 4b having different cutting radii are attached to the lower end edge 7a of the body portion 7 of the first tube 3 as a cutter bit 4 so as to be stepped. Cutter bit 4
"a" is attached prior to the inner cutter bit 4b.

Therefore, when cutting a super-hard rock, an obstacle containing a reinforcing steel bar or a steel plate, a steel plate, etc., the leading outer cutter bit 4a bites in first and the outer cutter bit 4a is cut.
Is used as a guide for cutting.

Therefore, the outer blade of the fourth embodiment,
The first tube 3 of the outer cutter bit leading type having the inner cutter bit attached thereto has the following functions and effects. (1) Since the outer cutter bit 4a bites in at the forefront and serves as a guide to perform cutting, cutting without side slip and center runout can be performed. (2) Since the outer cutter bit 4a cuts in advance,
The cutting area of the inner cutter bit 4b is reduced, and the cutting performance (cutting speed) is greatly improved. (3) Since a hole with no center runout, especially an accurate hole with an excavation outer diameter (R1) can be excavated, the surrounding ground is not disturbed. In addition, the foundation pile is formed by inserting a reinforcing rod cage into a casing tube after excavating to a predetermined depth. Since the ready-cast concrete is cast and the casing tube is pulled out, the amount of ready-mixed concrete used for foundation pile construction is reduced.

As described above, according to the first tube for the all-casing method according to the present embodiment, the cutting performance can be greatly improved and accurate cutting can be performed, so that the construction time can be reduced and the construction cost can be reduced.

FIG. 5 shows a main portion of a first tube for an all-casing method of an inner cutter bit leading type having an outer cutter and an inner cutter bit attached thereto according to a fifth embodiment of the present invention. FIG. 5 is an explanatory view similar to FIG. 1 illustrating the first embodiment, and the same parts as those described in the first embodiment are omitted, and different points will be mainly described.

In this embodiment, an outer cutter bit 4a and an inner cutter bit 4b having different cutting radii are attached to the lower end edge 7a of the body portion 7 of the first tube 3 as the cutter bit 4 at different levels. Cutter bit 4
b is attached prior to the outer cutter bit 4a.

Therefore, when cutting an ultra-hard rock mass, an obstacle containing a reinforcing steel bar or a steel plate, a steel plate, etc., the leading inner cutter bit 4b bites first and the inner cutter bit 4b is cut.
Is used as a guide for cutting.

Therefore, the outer blade of the fifth embodiment,
The first tube 3 of the leading type with the inner cutter bit attached with the inner cutter bit has the following functions and effects. (1) Since the inner cutter bit 4b cuts into the forefront and serves as a guide to perform cutting, cutting without side slip and center runout can be performed. (2) Since the inner cutter bit 4b cuts first,
The cutting area of the outer cutter bit 4a is reduced, and the cutting performance (cutting speed) is greatly improved. (3) Since a hole with no center runout, in particular, an accurate hole with an excavation inner diameter (R2) can be excavated, the surrounding ground is not disturbed, and a foundation pile is formed by inserting a steel cage into a casing tube after excavating to a predetermined depth. Since concrete is cast and the casing tube is pulled out, the amount of ready-mixed concrete used during foundation pile construction is reduced.

As described above, according to the first tube for the all-casing method according to the present embodiment, the cutting performance can be significantly improved and accurate cutting can be performed, so that the construction time can be reduced and the construction cost can be reduced.

The embodiment of the present invention has been described above.
It is needless to say that the present invention is not limited to the above-described embodiment, and various changes may be made to the specific structure within the scope of the present invention.

[0058]

(1) As described above, according to the first aspect of the present invention,
In the first tube for the all-casing method, which is attached to the end of the casing tube by the all-casing method, the first tube for the all-casing method has a plurality of types of cutter bits having different cutting radii at the tip edge of its body, and among the plurality of types of cutter bits. The cutter bit of one kind is mounted so as to precede the other kind of cutter bit, so the cutting surface is shared by multiple kinds of cutter bits with different cutting radii, so the life of the cutter bit is increased, In addition to the improvement, even when cutting ultra-hard rock, obstacles with steel bars and steel plates, steel plates, etc., the kind of leading cutting bit in the cutting bites into the cutting surface first, and it becomes the leading guide. Since cutting is performed, cutting without side slip and center runout can be performed, and other types of cutter The cutting area is reduced, cutting performance such as cutting speed is greatly improved, and accurate holes without center runout can be excavated, so that the use of fresh concrete is reduced at the time of foundation pile formation etc. without disturbing the surrounding ground Thus, the first tube for the all-casing method, which can significantly improve the cutting performance and perform accurate cutting, shorten the construction time and reduce the construction cost, can be obtained.

(2) According to the invention of claim 2, claim 1
In the first tube for the all casing method described in the above, the plurality of types of cutter bits cut an outer cutter bit for cutting the outer periphery of the body portion, an inner cutter bit for cutting the inner periphery, and cut the center of the outer periphery and the inner periphery. In addition to the effect of the invention according to claim 1, the cutting surface is formed of an outer cutter bit having a different cutting radius. The three types of cutter bits, the blade bit and the blade bit, are shared, and the blade bit is used for cutting ahead. It is more suitable for cutting obstacles with steel plates, steel plates, etc.

(3) According to the invention of claim 3, claim 1
In the first tube for the all casing method described in the above, the plurality of types of cutter bits cut an outer cutter bit for cutting the outer periphery of the body portion, an inner cutter bit for cutting the inner periphery, and cut the center of the outer periphery and the inner periphery. Since the outer cutter cutter bit is composed of a middle cutter bit, and the kind of cutter bit is the outer cutter bit, the cutting surface has an outer cutter cutter bit having a different cutting radius. The three types of cutter bits, the cutter bit and the medium cutter bit, are shared and the outer cutter bit performs cutting in advance. It is more suitable for cutting obstacles with steel plates, steel plates, etc.

(4) According to the invention of claim 4, claim 1
In the first tube for the all casing method described in the above, the plurality of types of cutter bits cut an outer cutter bit for cutting the outer periphery of the body portion, an inner cutter bit for cutting the inner periphery, and cut the center of the outer periphery and the inner periphery. The above-mentioned kind of cutter bit is configured as the inner cutter bit, so that in addition to the effect of the invention of claim 1, the cutting surface has an outer cutter bit with a different cutting radius. The three types of cutter bits, the blade bit and the medium bit, are shared, and the inner bit is used for cutting ahead. It is more suitable for cutting obstacles and steel plates.

(5) According to the invention of claim 5, claim 1
In the first tube for an all-casing method according to (1), the plurality of types of cutter bits include an outer cutter bit for cutting an outer periphery of the body portion and an inner cutter bit for cutting an inner periphery, and the kind of cutter bit includes the outer cutter bit. Claim 1 because the cutter bit is configured to be a blade bit.
In addition to the effects of the invention, the cutting surface is shared by two types of cutter bits, an outer cutter bit and an inner cutter bit having different cutting radii. In addition to being able to excavate accurate holes, it can be applied to ultra-hard rock, obstacles containing steel bars and steel plates, steel plates, etc., as well as to cutting soft rock and earth and sand.

(6) According to the invention of claim 6, according to claim 1,
In the first tube for an all casing method described in the above, the plurality of types of cutter bits include an outer cutter bit for cutting an outer periphery of the body portion and an inner cutter bit for cutting an inner periphery, and the kind of cutter bit is the inner cutter bit. Claim 1 because the cutter bit is configured to be a blade bit.
In addition to the effects of the invention, the cutting surface is shared by two types of cutter bits, an outer cutter bit and an inner cutter bit having different cutting radii, and the inner cutter bit performs cutting in advance. Not only can it excavate accurate holes, it can be applied to ultra-hard rock, obstacles containing steel bars and steel plates, steel plates, etc., and it can be more suitable for cutting soft rock and earth and sand.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part of a first tube for an all-casing method according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a main part of a first tube for an all-casing method according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a main part of a first tube for an all-casing method according to a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a main part of a first tube for an all-casing method according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a main part of a first tube for an all-casing method according to a fifth embodiment of the present invention.

FIG. 6 is an explanatory view of a working state of an all casing method.

FIG. 7 is a perspective view of a first tube.

FIG. 8 is a bottom view of the first tube as viewed in the direction of arrow A in FIG. 7;

FIG. 9 is an explanatory diagram of an example of an attached state of a cutter bit in a conventional first tube for an all-casing method.

FIG. 10 is an explanatory view of another example of a state of attachment of a cutter bit in a conventional first tube for an all-casing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 All casing excavator 2 Casing tube 3 First tube 4 Cutter bit 4a Outer cutter bit 4b Inner cutter bit 4c Middle cutter bit 5 Excavation bucket 6 Male joint 6a Lock pin 7 Body 7a Lower edge

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Kikuharu Egawa 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi F-term (reference) 2D029 DC01 PA07 PC01 PD04 2D050 CB01

Claims (6)

[Claims] 1. A first tube for an all-casing method, which is attached to the end of a casing tube by an all-casing method, the first tube for an all-casing method comprises a plurality of types of cutter bits having different cutting radii at a leading edge of a body portion thereof. A first tube for an all-casing method, wherein one kind of cutter bit is mounted so as to precede another kind of cutter bit. 2. The first tube for an all-casing method according to claim 1, wherein the plurality of types of cutter bits cut an outer periphery of the body.
An all-cutter method, comprising an inner cutter bit for cutting an inner periphery and a middle cutter bit for cutting the outer periphery and the center of the inner periphery, wherein the kind of cutter bit is the middle cutter bit. tube. 3. The first tube for an all-casing method according to claim 1, wherein the plurality of types of cutter bits cut the outer periphery of the body.
An all-casing construction method comprising: an inner cutter bit for cutting an inner periphery; and a middle cutter bit for cutting the outer periphery and the center of the inner periphery, wherein the kind of cutter bit is the outer cutter bit. tube. 4. The first tube for an all-casing method according to claim 1, wherein the plurality of types of cutter bits cut an outer periphery of the body.
A first cutter bit comprising an inner cutter bit for cutting an inner periphery and a middle cutter bit for cutting the outer periphery and the center of the inner periphery, wherein the kind of cutter bit is the inner cutter bit; tube. 5. The first tube for an all-casing method according to claim 1, wherein the plurality of types of cutter bits include an outer cutter bit for cutting an outer periphery of the body portion and an inner cutter bit for cutting an inner periphery of the body portion, The first tube for an all casing method, wherein the kind of cutter bit is the outer cutter bit. 6. The first tube for an all-casing method according to claim 1, wherein the plurality of types of cutter bits comprise an outer cutter bit for cutting an outer periphery of the body portion and an inner cutter bit for cutting an inner periphery, The first tube for an all casing method, wherein the kind of cutter bit is the inner cutter bit.