JP3436695B2 - Drilling method and core boring machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring method and a core boring machine, and more particularly to a technique for easily performing positioning in the initial stage of boring.

[0002]

2. Description of the Related Art A core boring machine rotates a hollow bit such as a diamond bit,
This is a device for forming a cylindrical perforation by cutting an object to be perforated.

Such a core boring machine is used, for example, when collecting a sampling sample of the ground or concrete, and a sample soil or sample concrete is added to a core tube successively added to the rear end side of the hollow bit. Etc. can be filled.

After the hollow bit is drilled to a predetermined depth, the tube and the bit are pulled out to obtain a sample filled in the tube at each depth.

By taking out and inspecting the sample thus collected, it is possible to know the changes in soil properties and concrete properties depending on the drilling direction and the drilling depth.
For example, it is used for advanced test drilling in the shield construction method and tunnel construction method, and for ground investigation before tunnel construction.

[0006] However, when performing a boring operation using this type of core boring machine, there are technical problems described below.

[0007]

That is, generally, a drilling method using a core boring machine of this type is, for example, almost vertical to a drilling object such as the ground surface, or in the tunnel construction method, etc. It suffices to drill substantially parallel to the direction, and normally there is almost no need to accurately specify the drilling position and drilling direction.

However, for example, when an underground buried object that is difficult to excavate is encountered while excavating a tunnel in the shield construction method, in order to know the size of the obstacle, etc. However, it is very difficult for the conventional core boring machine and drilling method to cope with such a situation.

Further, particularly when the surface at the drilling position is made of a different material such as an iron plate or when positioning and drilling in an oblique direction are required, it is very difficult to sufficiently position the bit at the initial stage of drilling. , When trying to pierce the back side ground through the iron plate, the tip of the bit does not bite well on the iron plate surface and it is dangerous to run at the same time, it moves from the planned drilling position and drills different places. Or, there is a problem that the drilling is performed at an angle different from the planned drilling angle.

The present invention has been made in view of such conventional problems, and an object thereof is to perform accurate drilling at a planned drilling position regardless of the material of the drilling surface and the drilling angle. It is to provide a drilling method and a core boring machine that can perform the drilling.

[0011]

In order to achieve the above object, the present invention provides a core boring having a core tube having a hollow bit mounted at its tip, and a machine body having a rotating mechanism for the core tube. In the drilling method using a machine, the machine body can be moved along the guide bar.
The guide bar at the tip of the guide bar.
Of the drilling plate on the side of the object to be drilled.
The first guide pipe is fixed at a fixed position, while the base is fixed.
The second guide pipe is fixed to the plate through the
The first and second guide pipes are connected by a joint, and the connection
After inserting the core tube into the guide pipe
To cut the object to be drilled with the hollow bit.
(Claim 1). With this configuration, the machine body is
Moving along the id bar will move the core tube
It is regulated by the guide pipe and is accurately drilled at the planned drilling position.
Holes can be formed. Also, the first guide pipe
It can be fixed at an angle to the drilling plan position in correspondence to the inclination angle of perforating (claim 2). According to this configuration, since the guide pipe is fixedly mounted on the object to be drilled in accordance with the inclination angle for drilling, the core tube is guided by the guide pipe, and the inclined drilling corresponding to the request can be formed. . And, the core boring machine used for the drilling method has a built-in rotation mechanism part, is connected to a core boring machine body movable along a guide bar, and a rotary shaft of the rotation mechanism part of the machine body, and has a tip end. The core tube to which the hollow bit is mounted, the base plate orthogonally arranged at the tip end position of the guide bar, the first guide pipe fixed in advance to the planned drilling position, and the core tube fixed through the base plate. The second guide pipe for inserting and guiding the pipe and a joint portion for connecting the first and second guide pipes on the same axis (claim 3) . According to the core boring machine configured as described above, if the first guide pipe is fixed at the planned drilling position and the second guide pipe on the base side is connected to the second guide pipe via the joint, the two guides are coaxial. Even if the surfaces to be perforated are made of different materials and the perforation angle is an inclined surface, the bit is guided by both guide pipes and positioned in the initial stage of perforation.

[0012]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1
Shows an embodiment of the punching method according to the present invention.
In the drilling method shown in the figure, one end of a hollow cylindrical guide pipe 80 is fixedly installed at a planned drilling position of a drilling object.

In the object to be drilled shown in the figure, an iron plate 11 is provided on the surface of the ground 12. The guide pipe 80 is
Steel pipes or hard plastics are used,
When using a steel pipe, the steel plate 11 is welded to the steel plate 11
In the case of hard plastics, it is similarly fixed to the iron plate 11 with an adhesive.

When the fixing of the guide pipe 80 is completed, the iron plate 11 and the ground 12 are perforated by the core boring machine. The core boring machine shown in this embodiment includes a machine body 3 having a built-in rotating mechanism and a core tube 4.

A core tube 4 is detachably connected to a rotating shaft 3a connected to a rotating mechanism of the machine body 3.
A hollow bit 5 is detachably attached to the tip of the core tube 4.

When boring the ground 12 and the iron plate 11, the core tube 4 having the hollow bit 5 mounted therein is inserted into the guide pipe 80, and the core tube 4 is contacted with the hollow bit 5 in contact with the iron plate 11. Is driven to rotate, and the iron plate 11 is cut by the hollow bit 5 to form perforations.

At this time, the inner diameter of the guide pipe 80 is set to be slightly larger than the outer diameter of the core tube 4, and its length is set to a length at least half the length of the core tube 4 is inserted. It is desirable to do.

When the iron plate 11 is perforated in this way,
The movement of the hollow bit 5 is restricted by the guide pipe 80, so that the displacement at the initial stage of perforation can be reliably prevented.

When the drilling of the iron plate 11 is completed, the ground 12 behind it is drilled. According to the drilling method performed as described above, one end of the guide pipe 80 is fixed in advance at the scheduled drilling position on the drilling target side, and the guide pipe 8
Since the object to be drilled is cut by the hollow bit 5 after inserting the core tube 4 into the hole 0, the movement of the core tube 4 is restricted by the guide pipe 80, and the hole can be accurately formed at the planned drilling position. .

In this case, the fixed state of the guide pipe 80 is not limited to the upright state shown by the solid line in FIG. 1, but may be fixed at a predetermined angle as shown by the phantom line in FIG. it can.

Therefore, if the guide pipe 80 is obliquely fixed in correspondence with the inclination angle for drilling, the core tube 4 is guided by the guide pipe 80, and the inclined drilling corresponding to the request can be formed. .

2 to 4 show another embodiment of the core boring machine and the boring method according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals.

FIG. 2 shows the overall structure of the core boring machine according to the present invention. The core boring machine shown in the figure has a slide block 2 mounted so as to be movable along a guide bar 1, and a machine body fixed to the slide block 2 and having its tip rotation shaft 3a positioned parallel to the guide bar 1. 3, a core tube 4 detachably attached to the rotary shaft 3a, a hollow bit 5 made of diamond or the like arranged at the most distal end of the core tube 4, and a base plate orthogonally arranged at the tip of the guide bar 1. 6
It is composed of and.

In the machine body 3, a rotary drive unit (not shown) such as an electric motor, which is connected to the rotary shaft 3a and drives the hollow bit 5 to rotate, is built in.

The length of the guide bar 1 corresponds to the penetrating stroke of one core tube 4, and the boring work is performed while the machine body 3 is advanced from the rearmost part of the guide bar 1, and at the most advanced position. By removing the connection between the rotating shaft 3a and the core tube 4 and retreating, adding the succeeding core tube 4 to the preceding core tube 4, and repeating the drilling work while advancing again, the ground is brought to a predetermined depth. Perforate and collect sample soil etc. inside.

A hollow cylindrical second guide pipe 7 having an inner diameter substantially equal to the outer diameter of the core tube 4 and penetrating and guiding the core tube 4 is penetratingly disposed in the base plate 6 at a penetrating position of the core tube 4.

On the other hand, on the surface of the object to be drilled at the planned drilling position, for example, when this is made of an iron plate or the like, the hollow cylindrical first guide pipe 8 is previously fixed by welding or the like. A pipe union (joint portion) is provided between the outer periphery of the first guide pipe 8 and the second guide pipe 7.
The hollow bit 5 and the core tube 4 following the hollow bit 5 are linearly guided via a coaxial cable 9.

Although not shown, the guide bar 1 and the slide block 2 are connected to each other by a rack and a pinion so that the guide block 1 and the slide block 2 can rotate and linearly move.
The slide block 2 is moved back and forth along the guide bar 1 by the turning operation of the operation lever 11 protruding to one side surface.

FIG. 3 shows details of the connecting structure of the guide pipes 7 and 8 and the pipe union 9. First, as shown in FIG. 3A, each of the second and first guide pipes 7,
8 is provided with socket portions 7a, 8a which are threaded on the inner circumference.

Both side nipples 7b and 8b are screwed and fixed to the socket portions 7a and 8a, respectively.
The inner diameter of 8b is set to be substantially equal to the outer diameter of the core tube 4.

On the other hand, the pipe union 9 comprises a union nut 9a, an intermediate ring 9b and a union bolt 9 in this order from the top.
It is composed of c. As shown in FIG. 3B, the nipples 7b and 8b are screwed and fixed in the sockets 7a and 8a, respectively, and the union nut 9a and the intermediate ring 9b are provided.
Is screwed and fixed to one nipple 7b side, the union bolt 9c is screwed and fixed to the other nipple 8b, and then the union bolt 9c is fixed as shown in FIG. 3 (c).
By screwing the union nut 9a to c, the guide pipes 7 and 8 are connected to each other on the same axis, and the hollow bit 5 and the core tube 4 following the hollow bit 5 can be guided through the inner periphery thereof.

FIG. 4 sequentially shows the procedure of the boring method in the case of penetrating the iron plate 11 having the required thickness and boring the ground 12 behind the core boring machine to take a sample.

When carrying out the punching method, first, referring to FIG.
As shown in (a), the first guide pipe 8 is fixed to the iron plate 11 at the planned drilling position by welding 14.

Next, as shown in FIG. 4 (b), the second and first guide pipes 7 and 8 are connected to each other via the pipe union 9, and the machine side is positioned and fixed at the drilling position.

That is, in this embodiment, the guide pipe 80 shown in FIG. 1 is divided into the first guide pipe 8 fixed at the planned drilling position and the second guide pipe 7 penetratingly fixed to the base plate 6, The first and second guide pipes 8 and 7 are connected by a union 9 (joint portion).

During the above work, the machine body 3
It is desirable to remove the guide bar from the guide bar 1 and perform the fixing work in a lightweight state.

Next, as shown in FIG. 4C, the machine body 3 is attached to the guide bar 1, and the core tube 4 having the hollow bit 5 attached to the tip thereof is connected to the rotary shaft.

After the above preparatory work, as shown in FIG. 4 (d), while rotating the rotary shaft 3a of the machine body 3, the operation lever 11 is rotated to move the core tube 4 forward. The hollow bit 5 moves in the guide pipes 7 and 8 and hits the surface of the iron plate 11. In this case, the rotary drive of the rotary shaft 3a can also be performed with the hollow bit 5 in contact with the iron plate 11.

Although a large cutting resistance is generated at the initial stage of this drilling, the hollow bit 5 is in a state in which the radial movement thereof is restricted by the guide pipes 7 and 8, and while maintaining this state, the guide pipe 7 and After moving in a straight line while rotating in 8, and penetrating the iron plate 11, it is linearly inserted into the ground 12, and the boring work is performed while maintaining the boring initial position.

Thereafter, as in the conventional case, if the ground 12 is drilled to a predetermined depth while successively adding the core tubes 4,
Each core tube 4 can be filled with the sample soil according to the perforation depth.

FIG. 5 shows a case where the surface of the iron plate 11 is tilted by a required angle α for punching. In this case,
The mounting surface of the first guide pipe 8 with respect to the iron plate 11 which is obliquely cut by the inclination angle α in advance is welded 14
It suffices to fix it and to connect it to the machine side through the union 9, and it is possible to perform the piercing work in the oblique direction at the inclination angle α according to the processing accuracy.

Further, when the iron plate 11 is fitted in such an inclined angle state, a larger cutting resistance is generated in the initial stage of drilling, but the inclination degree is accurately adjusted according to the welding strength of the guide pipe 8. The iron plate 11 can be penetrated while ensuring.

In the above embodiment, the guide pipes 7 and 8 are simply detachably connected by the pipe union 9, but in case of geology where water, muddy water, sand and the like are likely to flow backward, Then, a ball valve having the same hole diameter as the inner diameter is attached to the first guide pipe 8 side, and the core tube 4
If the ball valve is closed after all the holes have been pulled out, it is possible to prevent these jets and spouts from occurring after perforation.

Further, in the above embodiment, the object to be perforated in which the iron plate 11 is provided on the surface side of the ground 12 has been exemplified.
The embodiment of the present invention is not limited to this, and can be applied to, for example, a case where a wall body or a floor surface of reinforced concrete is directly drilled, or a case where rock is drilled.

Further, the practice of the present invention can be applied not only to sampling of soil and concrete, but also to holes that are appropriately perforated as necessary.

[0046]

As is apparent from the above description, in the core boring machine and the drilling method according to the present invention, the drilling is performed accurately at the planned drilling position regardless of the material of the penetration surface and the penetration angle. Can be formed.

Therefore, the present invention is suitable when the ground is perforated by penetrating the surface of a different material or when accuracy in the boring direction is required.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a punching method according to the present invention.

FIG. 2 is a perspective view of the overall configuration showing an embodiment of a core boring machine according to the present invention.

3 (a) to 3 (c) are side views showing details of a union and a connecting procedure thereof in the same machine.

4 (a) to (d) are cross-sectional explanatory views showing a construction procedure of a drilling method using the same machine.

FIG. 5 is an explanatory cross-sectional view showing a case where diagonal drilling is performed by the same machine.

[Explanation of symbols]

1 ... Guide bar 3 ... Machine body 3a ... Rotating shaft 4 ... Core tube 5 ... Hollow bit 6 ... Base plate 7 ... Second guide pipe 8 ... First guide pipe 9 ... Pipe union (joint part) 80 ... Guide pipe

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Claims (3)

(57) [Claims] 1. A drilling method using a core boring machine, which comprises a core tube having a hollow bit mounted at its tip and a machine body having a rotating mechanism for the core tube, the machine body being guided along a guide bar. It is movably installed
The base play at the tip of the guide bar.
Are placed at a right angle, and the
1 Guide pipe is fixed, while on the other hand, on the base plate
Fixedly penetrates the second guide pipe to secure the first and second guides.
A method for perforating a pipe, comprising connecting a pipe with a joint , inserting the core tube into the connected guide pipe, and then cutting the object to be perforated with the hollow bit. 2. The drilling method according to claim 1, wherein the first guide pipe is obliquely fixed to the planned drilling position in correspondence with an inclination angle for drilling. 3. A rotation mechanism section is built-in, and is installed along a guide bar.
The movable core boring machine body and the machine
It is connected to the rotating shaft of the rotating mechanism of the
Of the core tube with the
The base plate placed orthogonally at the end position and the
The first guide pipe fixed in place and the base plate
The core tube is fixed by penetrating the rate
The second guide pipe that guides and the first and second guide pipes.
And a joint for connecting the two types of pipes on the same axis
A core boring machine featuring.