JPS6354998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves drilling a hole in a seabed bedrock from a work scaffold or a work platform, installing an explosive cartridge in the hole, and then installing a detonation branch line and a detonation main line pulled out from the cartridge underwater. The present invention relates to an explosive cartridge for performing underwater detonation using an electric detonator connected to a detonator trunk line, and a detonating cord detonation method using the explosive cartridge.

Conventional underwater detonation methods include wired detonation method,
There are wireless detonation methods using ultrasonic waves or electromagnetic induction, but in either case, the electric detonator and explosive are integrated into one body, and this remains in that state for a long period of time, from the time the charge is completed until the time of detonation. Therefore, this is dangerous and undesirable from the viewpoint of managing explosives.

On the other hand, there is a detonating wire detonation method. This can be done by simply attaching an electric detonator to the detonating wire just before blasting.
The process of handling electric detonators can be minimized.

However, after all drilling work is completed from the work scaffold or work platform, a hard PVC pipe is inserted to protect the hole wall, and then divers use dynamite with a detonating cord and redundant dynamite to this pipe underwater. It is charged with a charge, connected to a detonating wire, and detonated with an electric detonator attached to the detonating wire.

Therefore, (1) it relies on the diver for all the charging and wiring work, which places a heavy burden on the diver's work, and also causes problems in the management of explosives if the number of holes is large. (2) Detonating wires are susceptible to abrasion, so if they are exposed to strong currents for a long period of time, there is a risk of misdetonation. (3) It is difficult for divers to confirm the charge.

The present invention employs the above-mentioned detonating wire detonation method in which the electric detonator, which is the most dangerous to handle in blasting work, is simply attached to the detonating wire immediately before blasting, and eliminates the above-mentioned drawbacks of this method by using an explosive cartridge. This problem has been overcome by making it possible to take out the detonation branch wire, which is used and stored slackly in the same cartridge at the time of detonation connection.

The gist of the invention is to load explosives into hard PVC pipes,
It is an explosive cartridge in which a detonation branch line is attached to the explosive, and this is slackened in the upper space of the pipe, and the end is connected to a rubber stopper attached to a PVC pipe cap, and it is also a work scaffold. Alternatively, an explosive is created by drilling a hole in the bedrock of the seabed using a drilling machine installed on the work platform, loading an explosive into a hard PVC pipe, and leaving the detonation branch line attached to the explosive to slack in the space of the pipe. Load the cartridge into the hole from the work scaffold or work barge, pull out the slackened detonation branch wire from the cartridge, connect it to the detonation main line via the connecting fitting, and connect the detonation main line with electricity. This is a method of detonating a detonating cord using an explosive cartridge, which is equipped with a detonator and connects this electric detonator to a blaster to perform underwater detonation.

This will be explained in detail based on the drawings.

1, an explosive cartridge 10 is shown. 1 is a hard PVC pipe, 2 is an explosive loaded therein, and 3 is a bottom plug that is screwed to the bottom of the PVC pipe 1. 5 is a pipe cap screwed onto the mouth of the pipe;
4 is the detonation branch line. 4″ is a detonation branch wire attached to both sides and the bottom of the explosive 2 in the PVC pipe 1;
4' is the detonation branch wire 4 which has been attached to the explosive 2, doubled and housed in the space 1' above the PVC pipe 1, and 4 is the detonation branch wire at both ends of the detonation branch wire. This is inserted into the hole 5' of the tube cap 5, and the detonating branch wire 4 is connected to the rubber stopper 6 attached to the tube cap 5 with a string 40.

The reason why the detonation branch line 4 is made double as described above is as follows. That is, if the detonator branch line 4 is single, with one end 4 inside the tube cap 5 and the other end 4 at the bottom of the PVC pipe 1 along with the explosive 2, both ends This is because water pressure is applied between the cuts and water will seep in through the cut, so this is prevented by making double cuts, and also because double cuts are naturally stronger than single cuts and help prevent cuts during handling.

8 is a hanging fitting, and 9 is a drain hole.

In the present invention, this explosive cartridge 10
The explosive cartridge 10 is charged into the borehole 15 of the seabed bedrock 7. First, the explosive cartridge 10 is carefully prepared on the work platform 11 or the work barge.

Then, as shown in FIG. 2, a hole is drilled into the seabed bedrock 7 using drilling machines 12, 12 installed on the work scaffold 11. For this drilling, as shown in Figure 3 A to D,
The casing pipe 14 is inserted using the bit 13 of the drilling machine 12 until the hole wall does not collapse.

Next, as shown in FIG.
The explosive cartridge 10 is lifted into the borehole 15 by a crawler crane 16 from above and charged. (See figure 2) After charging, pull out the casing pipe 14. (See E of the same figure.) In Fig. 2, 17 is what is called a launcher, and there is an explosive cartridge 1 inside it.
0 is set, and the perforation 15 of the cartridge 10 is charged.

The explosive cartridges 10, which have been loaded into the large number of holes 15 in this manner, are connected to detonating wires by a diver D, as shown in FIG.

To do this, diver D first inserts the rubber stopper 6 from the tube cap 5 of the same cartridge 10 underwater.
Remove. As a result, the double detonation branch wires 4', 4', which are slackened in the space 1' of the cartridge 10, are pulled out. The detonation branch lines 4', 4' are connected to the detonation main line 26 via a connecting fitting 20, which will be explained below.

5 to 7, reference numeral 20 indicates a connecting fitting, which is connected to a fixed shaft between both bottom plates 23 and 23'.
2, the hanging fitting 8 of the explosive cartridge 10 is inserted into one protruding end of the fixed shaft 22, and is fixed with a bolt and nut 21.

24 is a peripheral wall provided with through holes 25, 25 for inserting the detonator trunk line 26 and through holes 25', 25' for inserting the detonator branch line 4'. 31
A half tube attached to the outside of the through hole 25 into which the detonating main wire 26 is inserted receives the base of the inserted detonating main wire 26, and a vinyl pipe 39 is wrapped around the outer periphery to fix the base.

One bottom plate 23 is integral with a peripheral wall 24, and a rubber spacer 27 is filled therein. The other bottom plate 23' is fixed to the fixed shaft 22 with a pin 28.

As mentioned above, Diver D has explosive cartridge 1.
Pull out the detonation branch wires 4' and 4' from 0, and connect the ends of them to
As shown in FIG. 7, the through hole 25' of the connecting fitting 20
Insert it into the hole, hook it on the fixed shaft 22, take out the end from the same through hole 25' again, and then
As shown in the figure, add the extra length to the explosive cartridge 1.
0 to the PVC pipe 1 with an insulating lock 29. Reference numeral 30 denotes an insulock for tying together the extra lengths of the detonating branch lines 4', 4'.

Further, as shown in FIG. 7, the detonator main wire 26 is inserted into the connecting fitting 20 through the through hole 25 along the half pipe 31 so as to contact the detonator branch line 4' at right angles, and then inserted into the through hole 25 on the opposite side. It is led out through the through hole 25.

In other words, a large number of explosive cartridges 10, 10, .
As shown in the figure, all are connected to the detonator trunk line 26 via connecting fittings 20, 20, . . . . As shown in the figure, the detonation trunk lines 26, 26 at both ends are connected to the wire 3 stretched between the sinker 32 and the buoy 33.
4, 34 to buoys 33, 33, and electric detonators 35, 35 are attached to them above the water surface.

Next, the sub cable 3 is connected to the electric detonator 35, 35.
6 and 36, and a blasting bus 37 is attached thereto and connected to a blasting device 38.

After that, blasting can be performed using the blaster 38.

The present invention can achieve the following effects.

Among the explosives used in blasting work, the most sensitive to impact is the detonator, which requires delicate care and careful handling.According to the present invention, the electric detonator is used immediately before blasting. Since it is only necessary to attach it to the detonator trunk line, all operations are safe and easy to perform.

In addition, explosive cartridges can be created on the work scaffold or on the work platform, so explosives can be well managed, and since they can be charged to the seabed bedrock from the work scaffold or on the work platform, the charging location The diver's work can be easily managed, and the work performed by the diver is also simplified, making the work safer and reducing operational errors.

Since the detonator branch line is stored in the explosive cartridge until the day of connection, it is fully protected even under strong currents.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of the explosive cartridge;
The figure is a front view showing the working status on the work scaffold, Figure 3 A, B, C, D, H, F is a vertical side view sequentially explaining the drilling status with the bit of the drilling machine, and Figure 4 is the work performed by the diver. A perspective view showing the state, FIG. 5 is a longitudinal side view of the explosive cartridge with the connecting fitting attached, FIG. 6 is a side view of the connecting fitting, and FIG.
FIG. 8 is a sectional view taken along the line BB in the figure, and a perspective view showing the wiring state of the entire device. 1...Hard PVC pipe, 1'...Space, 2...Explosive,
4, 4'... Explosive branch line, 5... Pipe cap, 7... Seabed rock, 10... Explosive cartridge, 11... Working scaffold or work barge, 12... Drilling machine, 15... Drilling, 2
0... Connection fittings, 26... Detonator trunk line, 35... Electric detonator, 38... Blaster.

Claims (1)

[Scope of Claims] 1. A hard PVC pipe is loaded with an explosive, a detonation branch line is attached to the explosive, the lead wire is slackened in the space above the PVC pipe, and its end is inserted into the PVC pipe. An explosive cartridge connected to a rubber stopper attached to a tube cap. 2. A drilling machine was used from a work scaffold or a work platform to make a hole in the bedrock of the seabed, explosives were loaded into a hard PVC pipe, and the detonation branch line attached to the explosive was left slack in the hollow part of the pipe. explosive cartridge,
This is prepared on the surface of the water and charged into the hole from a work scaffold or a work platform, and the detonation branch line left slack in the same cartridge is pulled out underwater and connected to the detonation main line through a connecting fitting. A detonating method using an explosive cartridge that connects an electric detonator to a detonator main line above the water surface, and connects the electric detonator and a detonator to detonate underwater.