JPS5931393A - Cutting method - 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 This invention applies to tunnel excavation, etc., in which a slit is cut along the tunnel boundary line in the outer peripheral charge hole of the tunnel and blasted to obtain a smooth tunnel cross section. After drilling the charging hole, a high-pressure spray lance with an injection nozzle at the tip is inserted into the charging hole 1; a slit is cut by cutting the injection lance. If the tll is not approximately aligned with the center of the hole, it will not fit into the charging hole, and it takes time to align a 3 meter long injection lance with a 5 meter high charging hole, so Since a drill boom is required, the cost is high.This invention eliminates the above drawbacks, and enables short-time IuJ to be performed by economically cutting a slit cage into the charging hole without using a separate drill boom. This made it possible to cut slits using a drilling machine, which was previously considered impossible.
After the hole has been drilled and the hole is pulled out, ultra-high pressure water can be sent to cut the slit. This is a ladder that can be punched and slitted in the same way as ``9''. If we explain this with a diagram, the first
Figure 1 shows that Iwatake 2 receives the nozzle of the charging hole T-13 and injects the high-pressure jet. When the hole +tV is pulled out by rotating the can in the direction of 29, a large slit of f-15 is cut in the rock hole Sl. I can do it. Move left and right on the leader of hole drill or drill Iwatsuki 1j10 in 6). The check valve at 8 and the low pressure water at 9 are prevented from leaking to others by the stop valve that allows the flow of water and prevents the pressure from passing.
14 jets are emitted from 13 nozzles. 31 Ubi-nt 4 is a cutting tip attached to the bit. 12 is the 1st bottom pressure inlet. The stop pulp of No. 9 is, for example, the second
1Aa shows a valve 17, a valve pressure 27, a valve spring 18, a spring retainer 28, a valve seat stopper 19, a valve pressure spring 26, a valve push-up rod 21, a push-up spring 25, a frame 16, and a frame 14.゜6 is fixed with 20 setscrews. When water pressure is applied, the valve 17 and valve seat 27 are pushed by the water pressure and spring 2
6 is compressed and the push-up rod 21 contacts the valve seat stopper 19. However, when the water pressure is low, the spring 25 of the push-up rod is strong enough and the valve 17 and valve seat 27 are moved apart and held together as shown in Figure b. is 3
The flow is in the direction of 0, but when the water pressure becomes high, the protruding rod 21 is pushed by the valve 17 as shown in Figure 0, and the 7 Lange 22 of the protruding rod is separated from the plate 23 fixed to the valve seat stopper 19, and the valve 17 and the valve seat 27 are separated. remains closed. In Fig. 3a, the stop valve 9 is Orad 5.
In this case, the low pressure 2 passes through the stop valve 9 and exits the discharge port 24 as DI'l 1i1L.

Also, since the drilling rod rotates, the high-pressure water intake port 31 is allowed to rotate freely, and when it comes time to cut the slit, it can be jointed with the high-pressure main pipe port 32 by, for example, a cylinder 33 attached to the drill hole 4B16. Also, as shown in Figure 3, the stop valve 9 is in the bit, and the high pressure nozzle 13 is also in the bit. I? '27 shows 2, O. Rad and B.
For example, if a puncture ring 34 and a rotary locking spring 35 are used in the device 1 to open the 7th hole, the high pressure water will be injected through the nozzle 13 without being reduced by M. An example of using rotary joint 7 for the high-pressure removal port.
Show 1゛. The same applies when a part holding the stop valve 9 is inserted between the O-rad and the bit.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of this invention. FIG. 2a is a side view of an example of the stop valve part of the present invention. b and c are explanatory diagrams of the operation of the stop valve [1]. FIG. 3a is an explanatory diagram when a stop valve is inserted into the Orad. b is an explanatory diagram when a stop valve is inserted into the bit.

Claims (1)

[Claims] A valve is installed on the O-end or bit of the seven-hole machine, which allows low-pressure water to pass through and closes the high-pressure water.
This is a cutting method characterized by using a Jq spray nozzle to drill holes and high-pressure jets to cut slits, etc.