JPS61165490A - Method and device for forming ditch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and apparatus for forming grooves by making continuous perforations in rock, concrete, etc. [Prior Art] Civil engineering work In the field of construction work, when excavating bedrock or demolishing concrete, as shown in Figure 11,
A continuous hole in a workpiece a such as bedrock or concrete,
It is widely practiced to form ME by providing b,... 5 For example, in tunnel excavation work, a quiet system is used to excavate very hard rock without noise or vibration without using blasting The construction method uses a crushing agent. In this method, a static crushing agent is filled with light into a hole drilled in a tunnel face, and the rock is crushed by the expansion force of this crushing agent when it undergoes a chemical change and expands.

In this construction method, a free direction is formed by providing a straight groove cik shown in FIG. 11 in the center of the face, so that the rock mass can be easily and efficiently broken. Furthermore, in the demolition work of concrete structures, the concrete is divided into blocks using grooves as described above.

When forming such a groove C, the conventional method is to first drill a first hole using a rock drill or a drill, and then wrap a drift + Z bit around the periphery of this hole.
by drilling a second hole,
and bS+1)4 in the same way.
It is made by drilling holes.

[The problem that the invention is trying to solve]

However, with the groove forming method described above, when drilling the second hole, the drill bit may slip into the already drilled hole or its axis of rotation may tilt. Therefore, there is a problem that it is difficult to accurately drill holes.

For this reason, a parent-child bit d as shown in FIG. 12 is also used at the tip of the above-mentioned drill. Parent-child bit) (L is the child bit at the tip (L).

A hole of a predetermined size is made by drilling a small diameter hole using the small diameter hole as a guide and using a large diameter parent bit a as a guide. However, if this parent bit d increases the protrusion dimension of the child bit a, the rotation will quickly cause misalignment, so the child bit d1 should be increased by 6
Therefore, in the same way as above, the bit d moves in the direction of the already drilled hole without any restraint, as shown by the arrow in Fig. 12. However, it is rarely considered to be very effective.

Furthermore, it is conceivable to use a core boring machine as a means of forming #C, but the
In addition to the rock drills and drills that are always used, it is definitely necessary to have a core boring machine in terms of cost and work space.

This invention was made in view of the above circumstances, and it is possible to perform accurate drilling without the tip of the bit for drilling holes slipping or the axis of rotation of the bit being tilted.
It is an object of the present invention to provide a method and apparatus for easily forming grooves.

[Means for solving problems]

In this invention, when forming a groove by continuously providing a plurality of holes in a workpiece, the first invention includes a first step of providing guide holes at predetermined intervals on the center line of the groove; and a second step of drilling holes with a larger diameter than these guide holes using the provided guide holes as a guide, and the diameters of the holes drilled in the second step are set so that adjacent holes are continuous. That's what happens.

In a second invention, a cylindrical or cylindrical guide rod is provided at the center of the tip of the drill bit and extends in the axial direction of the drill bit.

〔Example〕

Embodiments in which the present invention is applied to tunnel excavation work will be described below with reference to FIGS. 1 to 10.

First, the tunnel excavation method will be explained with reference to Figures 9 and 10. This construction method uses the static crushing agent mentioned above to crush hard rock l to a predetermined size (l excavation length).
The tunnel 2 is excavated by breaking and excavating it one by one. That is, a large number of holes 4... each having a depth of one excavation length and a length L shown in FIG.
When a static crushing agent is filled into the hole 4, the rock mass around the hole 4 is distorted due to the expansion force of the crushing agent, and the inner surface of the groove 5, which is a free surface, is distorted. It deforms towards the end and eventually breaks. After that, this fractured rock 1 is discharged, a new face 3a is exposed, and holes 4 and grooves 5 similar to those described above are provided from this face 3a,
By repeating the above procedure, tunnel /I/2 is excavated.

Next, the procedure for forming the brocade 5 in the tunnel excavation method described above will be explained with reference to FIGS. 1 to 8.

First, guide holes 6 are bored near the center of the face 3, as shown in FIG. The guide holes 6 are bored at predetermined intervals on the center line of the groove 5 to be formed and parallel to each other, and the depth thereof is twice the excavation length l of the tunnel 2, that is, 2L. There is. Further, the diameter thereof may be the same as that of the holes 4 described above, and the holes 4 may be bored using an appropriate drilling machine.

Next, as shown in FIG. 2, a drill 7 is used to further drill a hole around one of the guide holes 6 (in FIG. 2, the uppermost guide hole). Now, if I explain Drill 7,
The drill 7 has a drill body (not shown) as shown in FIG.
A bit 9 is attached to the tip of a rod 8 that is rotationally driven by the bit 9, and a cylindrical guide rod 10 that projects in the axial direction of the bit 9 is attached to the center of the tip of the bit 9. The outer diameter of this guide rod 10 is approximately equal to that of the above-mentioned guide hole 6, and its length is equal to the 1 m circular length of the tunnel 2. The distance between them is slightly larger than the distance between them (the distance between their respective axes). Further, a cooling water pipe 11 is disposed inside the rod 8, bit 9, and guide rod 10, and cooling water sent from a cooling water supply source (not shown) through this cooling water pipe 11 is supplied to the base of the guide rod IO. Outlet ports 12 provided at the end and the tip, respectively.
・It is made to flow more easily. In addition, the above bird/L
The /7 drill body, rod 8, and bit 9 are the same as those of conventional drilling machines.

Using this bird/L/7, insert the guide rod 10 into the guide hole 6, press the tip of the bit 9 against the face surface 3, and gradually feed the bit, as shown in Fig. 2. , a hole 13 is formed by further drilling around the guide hole 6. The bit 9 is fed in this state, and when the tip of the guide rod 10 reaches the bottom of the guide hole 6, the hole 13 becomes blank, and drilling is stopped at this point (see FIG. 3).

Subsequently, the bird/L/7 is guided into the second guide hole 6 (the guide hole 6 adjacent to the hole 13 formed above), and as shown in FIGS. Depth L around 6
17) Forming the second hole 15. At this time, since the diameter of the bit 9 is larger than the distance between the guide holes 6, the first hole 13 and the second hole 15 are continuous (see FIG.
(See Part 1). Furthermore, when forming the second hole 13, the guide rod IO is inserted into the guide hole 6 in a state of almost intimate contact and guides the feeding of the bit 9, so that the bit 90 rotation axis may be tilted or the bit 9 may already be The second hole 13 can be easily and accurately removed without slipping in the direction of the first hole 13 formed.
holes 13 can be formed. Note that since the cooling water is sent into the guide hole 6 from the outlet 12 of the guide rod IO, the bit 9 for drilling the hole 13 will not overheat, and the guide rod 10 will not touch the inner surface of the guide hole 6. can prevent overheating due to friction.

The grooves 5 are formed by sequentially repeating the above steps and drilling all the holes 13 as shown in FIG.

Therefore, if the static crushing agent is filled in the filling hole 4, the rock mass l will be separated by the length L, as shown by the broken line in Fig. 7. LS is performed, and a new face 3a is exposed. and,
From this new face 3a, guide holes 6... are further drilled to a depth L to form the state shown in Fig. 1, and by repeating the above steps, tunnel /L/2 is excavated. become.

An embodiment of the present invention has been described above.

This invention is not limited to the above embodiments.

For example, in the above embodiment C, the holes 13 were formed after all the guide holes 6... were formed, but only one guide hole 6...
. . , and then the holes 13 may be formed immediately around the holes 13. Further, the holes 13 are not necessarily bored adjacent to each other, and the order may be arbitrary.

Further, the cooling water supply mechanism (cooling water pipe 11, outlet 12) of the drill 7 is not necessarily provided if cooling water is not required depending on the condition of the rock l. In addition, this invention
Of course, it may also be used in cases other than tunnel excavation work, such as concrete demolition work.

〔Effect of the invention〕

As explained in detail above, according to the first invention, after a guide hole is provided, holes having a diameter larger than the guide hole are continuously drilled using the guide hole as a guide. This has the advantage that accurate drilling can be performed without the tip of the bit slipping or the axis of rotation of the bit being tilted, and grooves can be easily formed.

Further, according to the second invention, since the guide rod that protrudes and extends at the tip of the bit is provided, the bit is guided by the guide rod, and the tip of the bit does not slip or the axis of rotation of the bit does not tilt. has.

[Brief explanation of drawings]

1 to 8 are diagrams showing one embodiment of the present invention. Figures 1 to 7 are diagrams showing the steps of the groove forming method of this embodiment, and Figure 1 is a diagram showing the state in which the guide hole has been drilled. Cross-sectional view, (Port 1 is a front view, Figure 2 is a side sectional view showing the state in which the gt hole is being drilled, and Figure 6 is the state in which the first hole has been drilled, of which A) is a side sectional view, (b) is a front view, and
The figure is a side sectional view showing the state where hole @2 is being drilled, l@
Figure 5 shows the state in which the second hole has been drilled, of which (A) is a side sectional view, (B) is a front view, and Figure 6 shows the state in which all holes have been drilled. (A) is a side sectional view, (B) is a front view, and FIG. 7 is a side sectional view showing the state in which the guide hole is drilled deeper. FIG. It is a side view showing the schematic configuration of the drill used. FIG. 9 and FIG. 1θ are diagrams for explaining the method of tunnel excavation work using the groove forming method of this embodiment, in which FIG. 9 is a front view of the face portion, and FIG. Figure x
- It is an X-ray side sectional view. FIG. 11 shows a groove formed by continuous holes, of which (a) is a plan view and (b) is a side sectional view.
FIG. 2 is a diagram illustrating a conventional method of forming grooves, and is a side sectional view of a state in which a parent and child bit is drilling. l... Rock (workpiece), 5... Groove, 6... Guide hole, 7... Tori (groove forming device), 9... Drill bit, lO... Guide Rod, 13... Hole.

Claims (2)

[Claims] (1) In a method of forming a groove by consecutively providing a plurality of holes in a workpiece such as rock or concrete, the first step is to provide guide holes at predetermined intervals on the center line of the groove, and the formation thereof. and a second step of drilling holes with a larger diameter than these guide holes using the guide holes as guides, and the diameters of the holes drilled in the second step are set so that adjacent holes are continuous. A method for forming a groove characterized by: (2) In a device that uses a rotating drill bit to drill holes in a workpiece such as rock or concrete to form a groove, the drill bit extends from the center of the tip of the drill bit and extends in the axial direction of the drill bit. A groove forming device characterized by being provided with a cylindrical or columnar guide rod.