explosives loading device

Abstract

To provide an explosive loading device capable of loading explosive smoothly while removing rocks and other debris from a blast hole causing the hole rough without requiring much time and effort.SOLUTION: An explosive loading device 10 includes: an insertion tube 11 with a length capable of being inserted up to near hole end 31a; a pressure pipe connection valve 12 connected with flexible piping 18 through which explosive 32 is pumped; a hollow bit 13 attached to a tip 11a of the insertion tube 11; and a connection joint 14 for joining the explosive loading device 10 to a drifter 22. After the inside of a blast hole 31 drilled by a drilling machine 21 is cleaned by the hollow bit 13 at the tip of the insertion tube 11 and the drifter 22, the explosive 32 is pumped through the flexible piping 18 and the insertion tube 11 to load the pumped explosive 32 to the hole end 31a from a hollow penetration portion 13a of the hollow bit 13.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an explosive loading device, and more particularly to an explosive loading device for loading explosives into blast holes formed in a tunnel face in mountain tunnel construction methods. [Background technology]

[0002] In mountain tunnel construction, a method is sometimes employed in which excavation is performed while collapsing the ground at the face, such as bedrock, by blasting with explosives. To collapse the ground at the face, such as bedrock, by blasting with explosives, blast holes are drilled and formed at multiple predetermined positions on the face, explosives are loaded into the formed blast holes, and the loaded explosives are then detonated by a detonator. As the heavy machinery for drilling and forming the blast holes for this purpose, a well-known heavy machinery for drilling, such as a drill jumbo equipped with a face drilling machine, is used (see, for example, Patent Document 1).

[0003] In drilling heavy equipment, the mounted face drilling machine has a drifter as the drilling machine body, which has the function of moving the connected equipment back and forth at a high speed of, for example, about 3,600 times per minute, as well as the function of rotating it.A drilling rod with a drilling bit at the tip is connected to this drifter, and by striking the drilling bit and pushing the drilling rod into the ground at the face of the rock, etc., blast holes are drilled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3461600 [Patent Document 2] Patent No. 4621149 Summary of the Invention [Problem to be solved by the invention]

[0005] On the other hand, in the work of loading explosives into a drilled blasthole, for example, in Patent Document 1, a loading device mounted separately from the face drilling machine is used to insert a loading hose into the drilled blasthole, supply explosives from a supply port at the base end of the inserted loading hose, and then use a push rod to push the supplied explosives through the hollow interior of the loading hose, thereby loading the explosives into the end of the blasthole. Also, in Patent Document 2, for example, a work platform equipped on a drilling heavy machine that can rise and fall and move back and forth and left and right relative to the face is used as a scaffold, and a worker approaches the face and pressure-feeds the explosives through the loading hose and loading pipe, thereby loading the explosives into the end of the blasthole.

[0006] However, according to the above-mentioned conventional method of loading explosives into a blast hole, it is possible to smoothly insert a loading hose or loading pipe to the end of the blast hole, preferably when the wall surface of the blast hole is stable after drilling.However, if the wall of the hole has collapsed and become rough due to the effects of drilling an adjacent blast hole, for example, collapsed rocks and the like will become an obstacle, making it difficult to smoothly insert a loading hose or loading pipe to the end of the hole.

[0007] In particular, since a predetermined number of blast holes are usually formed in a series along a predetermined design line before switching to the task of loading explosives, if the ground at the face is brittle, when new blast holes are drilled around previously drilled blast holes, the wall surfaces of the previously drilled blast holes are likely to become rough due to surface wear, etc.

[0008] When a blast hole becomes rough, it is necessary to remove any obstructing debris, such as collapsed rocks, from the blast hole before loading explosives. Conventionally, workers have had to enter the vicinity of the face to remove the debris, such as rocks, from the blast hole. However, this type of removal work requires a lot of time and effort, and there is a risk of the surface falling off, especially if the ground at the face is brittle. Therefore, it is desirable to avoid working around the face.

[0009] The object of the present invention is to provide an explosive loading device that can remove obstructive residues such as rocks from a roughened blast hole and smoothly load explosives without requiring workers to enter the vicinity of the working face or requiring much effort. [Means for solving the problem]

[0010] The present invention is an explosive loading device that is attached to the drilling machine body of a face drilling machine mounted on a drilling heavy machine for drilling blast holes in a face in mountain tunnel construction, and loads explosives into the formed blast holes. The explosive loading device comprises an insertion tube having a length that allows the tip portion to be inserted up to the vicinity of the end of the blast hole, and a flexible tube provided at the rear end portion of the insertion tube through which explosives are pumped. S and a connecting joint section for integrally joining the explosive loading device to a drifter forming the drilling machine body in a state in which the insertion cylinder is extended parallel to the advancing and retreating axial direction of the drifter. After the inside of the blast hole formed by the face drilling machine is dug out using the insertion cylinder with the hollow bit attached to the tip end and the drifter, the flexible pipe is opened and closed. S The above object has been achieved by providing an explosive loading device that can pressurize explosives through the bull piping and the insertion cylinder, and load the pressurized explosives into the end of the hole from the hollow penetration portion of the hollow bit.

[0011] The explosive loading device of the present invention is preferably provided with an openable and closable supply pipe connection valve portion at the rear end portion of the insertion cylinder, to which a supply pipe for supplying air or water is connected.

[0012] In addition, the explosive loading device of the present invention preferably has an openable and closable discharge valve portion provided at the rear end portion of the insertion cylinder for discharging water remaining in the hollow interior of the insertion cylinder.

[0013] Furthermore, in the explosive loading device of the present invention, a connection arm portion is integrally joined to the rear end portion of the insertion cylinder via a connection base portion, and is provided on the rear side of the insertion cylinder so as to extend parallel to the insertion cylinder, and the connection joint portion is attached to the rear end of the connection arm portion, and the flexible cable is attached to the rear end of the insertion cylinder. S It is preferable that the pressure pipe connection valve portion to which the pressure pipe is connected is provided.

[0014] Furthermore, in the explosive loading device of the present invention, it is preferable that the connecting arm portion is provided with a rotation prevention means that engages the drifter with a guide shell that guides the drifter in the axial direction, thereby preventing the insertion cylinder from shifting in its position relative to the drifter in the circumferential direction.

[0015] In the explosive loading device of the present invention, the outer peripheral surface of the hollow bit preferably has a tapered portion whose outer diameter decreases toward the tip.

[0016] Furthermore, in the explosive loading device of the present invention, an air packer member is attached to the insertion cylinder, and when air or water is supplied from the supply pipe and the air packer member expands, it comes into close contact with the outer peripheral surface of the insertion cylinder and also with the opening edge of the blast hole at the face, and it is preferable that air or water is sent between the outer peripheral surface of the insertion cylinder and the inner wall surface of the blast hole from one end of a pressure-resistant hose that passes through the air packer member. [Effects of the Invention]

[0017] According to the explosive loading device of the present invention, it is possible to remove obstructing residues such as rocks from a roughened blast hole and load explosives smoothly without workers having to go near the working face or requiring much effort. [Brief explanation of the drawings]

[0018] [Figure 1]1 is a schematic side view illustrating a drilling heavy machine equipped with a face drilling machine that is used with an explosive loading device according to a preferred embodiment of the present invention. [Figure 2] 1 is a schematic side view illustrating an explosive loading device according to a preferred embodiment of the present invention. [Figure 3] FIG. 1 is a schematic side view illustrating the drilling of a blast hole by a drill rod and a drill bit attached to a face drilling machine. [Figure 4] FIG. 1 is a schematic side view illustrating the installation of an explosive loading device on a face drilling machine in place of a drilling rod and a drill bit. [Figure 5] FIG. 1 is a schematic side view illustrating a situation in which a hole is dredged using an explosive loading device attached to a face drilling machine. [Figure 6] FIG. 1 is a schematic side view illustrating the loading of explosives by an explosive loading device attached to a face drilling machine. [Figure 7] (a) is a front view of the hollow bit, and (b) is a cross-sectional view taken along the line AA in (a). [Figure 8] FIG. 4 is an explanatory diagram of a rotation prevention mechanism. [Figure 9] FIG. 10 is a schematic side view illustrating a main part of another type of explosive loading device. [Figure 10] FIG. 10 is a schematic, partially cutaway side view illustrating the removal of residue using another form of explosive loading device. DETAILED DESCRIPTION OF THE INVENTION

[0019] An explosive loading device 10 (see Figure 2) according to a preferred embodiment of the present invention is attached to a drilling heavy machine 20 equipped with a face drilling machine 21 that drills a blast hole 31 in the ground 30 at the face of the working face, as shown in Figure 1, in place of a drilling rod 24 having a drilling bit 23 at its tip, which is attached to a drifter 22, which is the drilling machine body of the face drilling machine 21 (see Figure 4), and can be used as a device for loading a main die 32a and an add-on die 32b together with a filling material 32c as explosives 32 into the hole butt 31a, which is the deepest part of the drilled blast hole 31 (see Figures 3 and 5) (see Figure 6). The explosive loading device 10 of this embodiment has the function of removing the obstructing residue from the roughened blast hole 31 without much effort by working in an area away from the working face 30a, and enabling the explosive 32 to be loaded smoothly, even if the wall of the blast hole 31 drilled into the ground 30 at the working face 30a has collapsed, causing the hole to become rough and leaving obstructing residue such as collapsed rocks inside the hole.

[0020] The explosive loading device 10 of this embodiment is a loading device that is attached to a drifter 22, which is a drilling machine body of a face drilling machine 21 mounted on a drilling heavy machine 20, for drilling and forming a blast hole 31 in the ground 30 of a face 30a (see Figures 3 and 5) in a mountain tunnel construction method, and loads explosives 32 into the formed blast hole 31. As shown in Figure 2, the explosive loading device 10 includes an insertion cylinder 11 having a length that allows a front end 11a to be inserted up to the vicinity of the hole end 31a of the blast hole 31, and a flexible tube 11b provided at a rear end 11b of the insertion cylinder 11, through which explosives 32 are pumped. S The explosive loading device 10 is provided with an openable and closable pressure pipe connection valve section 12 to which a bull piping 18 is connected, a hollow bit 13 attached to the tip end 11a of the insertion cylinder 11 and having a hollow through-hole section 13a (see FIG. 7) having a cross-sectional shape similar to the hollow interior of the insertion cylinder 11, and a connection joint section 14 for integrally joining the insertion cylinder 11 to a drifter forming a drilling machine main body 22 in a state in which the insertion cylinder 11 is extended parallel to the advancing and retreating axial direction X of the drifter 22. After the inside of the blast hole 31 drilled and formed by the drilling machine 21 is cleared by the insertion cylinder 11 with the hollow bit 13 attached to the tip end 11a and the drifter 22, a flexible S The explosive 32 is pumped through the bull piping 18 and the insertion cylinder 11, and the pumped explosive 32 can be loaded from the hollow penetration portion 13a of the hollow bit 13 into the hole end portion 31a.

[0021] In addition, in this embodiment, an openable / closable supply pipe connection valve section 15 is preferably provided at the rear end portion 11b of the insertion cylinder 11, to which a supply pipe 19 for supplying air or water is connected, and an openable / closable discharge valve section 16 is provided to discharge water remaining in the hollow interior of the insertion cylinder 11.

[0022] Furthermore, in this embodiment, a connection arm 17 is preferably integrally joined to the rear end portion 11b of the insertion cylinder 11 via a connection base 17a, and is provided on the rear side of the insertion cylinder 11, extending parallel to the insertion cylinder 11. A connection joint 14 for connecting to the drifter 22 is attached to the rear end of the connection arm 17, and a flexible cable is attached to the rear end of the insertion cylinder 11. S A pressure pipe connection valve section 12 to which a pressure pipe 18 is connected is provided.

[0023] In this embodiment, the drilling heavy equipment 20 equipped with the face drilling machine 21 has a configuration similar to that of a well-known drilling heavy equipment known as a drill jumbo, and as shown in Fig. 1, in addition to the heavy equipment main body 25 equipped with a traveling section and the above-mentioned face drilling machine 21 mounted on the heavy equipment main body 25, it is configured to include a compressor, a water tank, a water supply device, a control panel, etc., as well as a man gauge 26 serving as a work platform. The drilling heavy equipment 20 moves the face drilling machine 21 by the traveling section to a position facing the tunnel face 30a, and then stabilizes and fixes it to the ground by the outriggers 25a, so that it can perform the tasks of drilling blast holes 31 and loading explosives 32 into the formed blast holes 31.

[0024] The face drilling machine 21 also has a configuration similar to that mounted on known heavy drilling equipment, and includes a drifter 22, which is the drilling machine body, a drilling rod 24 connected to the drifter 22 and having a drilling bit 23, a drilling boom 21a supported on the heavy machine body 25 so as to be able to be raised and lowered and rotated, a guide shell 21b that guides the advance and retreat of the drifter 22 along the advance and retreat axis direction X, a rotary actuator 21c, a slide cylinder 21d, and an advance and retreat mechanism (not shown) for advancing and retreating the drifter 22. The face drilling machine 21 discharges water or the like sent from a supply pipe (not shown) from the tip of the drilling rod 24, and advances and retreats the drifter 22 connected to the drilling rod 24 while reciprocating back and forth at high speed and rotating it, thereby drilling a blast hole 31 to a predetermined depth (see FIG. 3). The explosive loading device 10 of this embodiment is attached to the drifter 22 in place of the drilling rod 24 having the drilling bit 23 after the blast hole 31 has been drilled, allowing the work of drilling the drilled blast hole 31 and the work of loading the explosive 32 to be carried out efficiently.

[0025] 2, the explosive loading device 10 of this embodiment is configured to include an insertion cylinder 11, a pressure pipe connection valve section 12, a hollow bit 13, and a connection joint section 14, and preferably also includes a supply pipe connection valve section 15, a discharge valve section 16, and a connection arm section 17. The insertion cylinder 11 is made of a hollow steel or aluminum pipe member with a circular cross section, for example, an inner diameter of about 34 mm and an outer diameter of about 42 mm, and has a length of, for example, about 3,000 to 3,500 mm so that the tip section 11a can be inserted to the vicinity of the butt section 31a of the blast hole 31. The hollow bit 13 is attached integrally to the tip section 11a of the insertion cylinder 11.

[0026] 7(a) and (b), the hollow bit 13 is preferably a molded metal (steel) part with a carbide tip 13b embedded in the outer peripheral surface of the tip portion, and has a cylindrical connection base end portion 13c and a leading cone-shaped tip portion 13d, with a hollow through-portion 13a penetrating these in the axial direction and preferably having an inner diameter similar to that of the insertion cylinder 11. The outer peripheral surface of the leading cone-shaped tip portion 13d is a tapered portion 13e whose outer diameter decreases toward the tip. In this way, the outer surface of the hollow bit 13 (the outer diameter at the connection point with the insertion cylinder is, for example, 42 mm) has a tapered portion 13e with the outer diameter narrowing toward the tip (the outer diameter at the tip is, for example, 40 to 41 mm), making it easier to insert the insertion cylinder 11 into the blast hole 31, and when the blast hole 31 is being cleared while crushing obstructing residues such as rocks, the crushed rocks, etc. are sent backward through the gap between the hole wall of the blast hole 31 and the outer surface of the hollow bit 13, and are crushed into smaller pieces.This makes it easier to pass the crushed rocks, etc. through the gap between the blast hole 31 and the insertion cylinder 11 and discharge them out of the blast hole 31.

[0027] In this embodiment, the connection joint 14 that connects the insertion cylinder 11 to the drifter 22 is preferably attached to the rear end of the connection arm 17. The connection arm 17 is configured to move the central axis of the insertion cylinder 11 away from the forward / backward axial direction X of the drifter 22, and to connect the flexible pipe through which the explosive 32 is pumped to the rear end of the insertion cylinder 11. S The connecting arm 17 is a part provided to enable linear connection of the bull piping 18. The connecting arm 17 is joined integrally to the rear end portion 11b of the insertion cylinder 11 via a connecting base 17a, and is provided to extend parallel to the rear side of the insertion cylinder 11, and a known connecting joint 14 for connecting to the drifter 22 is attached to the rear end via, for example, a connecting sleeve 17b. This allows the insertion cylinder 11 to move back and forth at high speed along a central axis parallel to the advancing / retracting axial direction X of the drifter 22, while also moving back and forth together with the drifter 22 along the guide shell 21b.

[0028] In this embodiment, drilling and explosive loading operations using the explosive loading device 10 are performed with the function of rotating the insertion cylinder 11 by the drifter 22 stopped. Preferably, a rotation prevention means 27 is provided to prevent the insertion cylinder 11 from shifting circumferentially relative to the drifter 22 during these operations. The rotation prevention means 27 may be, for example, a pair of locking rods 27a fixed to the connection arm 17 by welding or the like and extending in a V-shape toward the lower guide shell 21b, as shown in FIGS. 2 and 8 . The rotation prevention means 27 includes a pair of locking rods 27a arranged on both sides of the guide shell 21b. When one of the locking rods 27a abuts against the side of the guide shell 21b, excessive circumferential shift of the insertion cylinder 11 relative to the drifter 22 during these operations can be prevented.

[0029] The pressure pipe connection valve portion 12 is a flexible pipe similar to the loading hose used in the explosive loading method and loading device of the above-mentioned Patent Document 2 (Patent Publication No. 4621149). S The pressure pipe connection valve section 12 is provided with a known structure for connecting the flexible pipe 18 to the rear end of the insertion cylinder 11 in an openable and closable manner. As will be described later, when the pressure pipe connection valve section 12 is open, the flexible pipe 18 is S The explosive 32 is pumped through the bull piping 18 and passes through the insertion cylinder 11, and is loaded into the hole end 31a of the blast hole 31 from the hollow penetration part 13a of the hollow bit 13. S The bull piping 18 is preferably a transparent or semi-transparent piping (hose) whose inside can be seen so that the position of the explosive 32 being pumped can be seen (see FIG. 6).

[0030] The supply pipe connection valve unit 15 is a connection valve unit for openably connecting a supply pipe 19 that supplies air or water to the hollow bit 13 to reduce friction during cutting, for example, when drilling the blast hole 31 formed by the insertion cylinder 11 of the explosive loading device 10. In this embodiment, the supply pipe connection valve unit 15 is attached to a supply branch pipe 15a that protrudes outward at the rear end portion 11b of the insertion cylinder 11, and can supply air or water from the supply pipe 19 to the hollow interior of the insertion cylinder 11 by, for example, closing the pressure pipe connection valve unit 12 and the discharge valve unit 16 (described later) and opening the valve unit. In addition, the air and water supplied to the hollow interior of the insertion cylinder 11 are discharged outside the blast hole 31 through the gap between the hollow bit 13 or insertion cylinder 11 (e.g., φ42 mm) and the inner wall surface of the blast hole 31 (e.g., φ45 mm), along with any obstructing residues such as rocks that are removed by drilling.

[0031] The discharge valve portion 16 is a flexible pipe that is used to drain the blast hole 31 that has been drilled. S The discharge valve 16 serves as a valve for draining residual water, particularly residual water, from the insertion cylinder 11 prior to pumping explosives 32 from the bull piping 18 to the insertion cylinder 11. In this embodiment, the discharge valve 16 is attached to a discharge branch pipe 16a protruding diagonally downward at the rear end 11b of the insertion cylinder 11. For example, by closing and then opening the pressure pipe connection valve 12 and the supply pipe connection valve 15, residual water within the hollow interior of the insertion cylinder 11, together with slime, can be drained out of the insertion cylinder 11, preferably by gravity. If the remaining slime within the hollow interior of the insertion cylinder 11 cannot be sufficiently drained, for example, after the insertion cylinder 11 is withdrawn from the blast hole 31, the discharge valve 16 can be closed and the supply pipe connection valve 15 can be opened to supply air or water, which can then push the remaining slime out of the tip of the hollow bit 13, thereby enabling the slime to be discharged.

[0032] To load explosives 32 into the hole end 31a of the blast hole 31 using the explosive loading device 10 of this embodiment having the above-mentioned configuration, a drilling rod 24 having a drilling bit 23 at its tip is attached to the drifter 22 of the face drilling machine 21, and the blast hole 31 is drilled in the ground 30 of the face 30a (see FIG. 3). After that, as shown in FIG. 4, the explosive loading device 10 is attached to the drifter 22 in place of the drilling rod 24, and a flexible wire is inserted into the pressure pipe connection valve part 12. S 5, the hollow bit 13 at the tip 11a is inserted into the vicinity of the hole end by reciprocating back and forth at high speed with the drifter 22, while supplying air or water into the hollow interior of the insertion cylinder 11 from the supply pipe 19, thereby crushing and removing any obstructing residue such as rocks inside the blast hole 31, thereby performing hole drilling. After the blast hole 31 has been drilled, the supply pipe connection valve 15 is closed, and the pressure pipe connection valve 12 is opened, and the flexible S Explosives 32 are pumped into the insertion tube 11 via the bull piping 18, and the pumped explosives 32 are pushed into the blast hole 31 through the hollow penetration portion 13a of the hollow bit 13, and the pushed explosives are loaded into the hole end 31a.

[0033] In this embodiment, the parent die 32a of the explosives 32 to be loaded preferably uses a wireless ignition circuit (wireless detonator) that does not require wiring work near the face 30a, and can be used while being covered with a paper tube made of cardboard or the like for protection during pressure feeding. The parent die 32a, together with the supplementary die 32b and the padding material 32c, are connected together and flexible, using a loading machine similar to that used in the explosive loading method and loading device of the above-mentioned Patent Document 2 (Patent Publication No. 4621149). S When attached inside the bull piping 18, it is preferably pumped in as a single unit, and is then loaded sequentially into the butt 31a of the blast hole 31 via the insertion cylinder 11 and hollow bit 13.

[0034] In this embodiment, a wired detonator with a leg wire can also be used as the parent die 32a of the explosive 32. In this case, after the hole has been drilled, the insertion tube 11 is temporarily withdrawn from the blast hole 31, and the parent die 32a with the leg wire extending therefrom is attached to the hollow penetration portion 13a of the hollow bit 13 at the tip end 11a. In this state, the leg wire is pulled out to the outside of the blast hole 31 through the gap between the hollow bit 13 or the insertion tube 11 and the inner wall surface of the blast hole 31, and the insertion tube 11 is reinserted into the blast hole 31 until the tip end 11a reaches the vicinity of the hole end 31a, and air is pumped in to load the parent die 32a into the hole end 31a. Thereafter, the additional die 32b and the padding material 32c are inserted into the flexible tube 31 by the same method as described above. S By pumping the explosive through the bull piping 18 and the insertion cylinder 11 and pushing it into the blast hole 31 through the hollow penetration portion 13a of the hollow bit 13, the explosive 32, which is connected to the parent die 32a, the add-on die 32b, and the filling material 32c, can be loaded into the hole end 31a of the blast hole 31.

[0035] As a result, the explosive loading device 10 of this embodiment makes it possible for workers to remove obstructing residues such as rocks from a roughened blast hole 31 without having to enter the vicinity of the working face 30a and without requiring much effort, and to smoothly load explosives 32 into the hole end 31a.

[0036] The present invention is not limited to the above embodiment and various modifications are possible. For example, it is not necessarily required to provide a connection arm portion that extends parallel to the insertion cylinder and is integrally joined to the rear end portion of the insertion cylinder via the connection base portion. The insertion cylinder may be directly joined to the drifter by attaching a connection joint portion to the rear end portion of the insertion cylinder. In this case, the flexible S The bull piping can be connected to the hollow interior of the insertion cylinder via the pressure pipe connection valve and the branch pipe by attaching a pressure pipe connection valve to a branch pipe that protrudes outward from the outer periphery of the insertion cylinder. Furthermore, it is not necessary to provide a rotation prevention means on the connection arm, and it is not necessary for the hollow bit to have a tapered portion on its outer periphery.

[0037] The explosives are compressed at a speed that will not cause an explosion due to friction during pumping or the impact of hitting the bottom of the hole. S It is preferable to move the die through the hollow interior of the bull piping or insertion cylinder. An emulsion type die can be used for the additional die. If the drilled blast hole is free of roughness, explosives can be pumped in without drilling, and the explosives can be loaded into the end of the blast hole. In addition, it is preferable to use remotely operable electromagnetic valves for the supply pipe connection valve, discharge valve, and pressure pipe connection valve so that workers do not need to approach the face to perform their work.

[0038]

[0046] In the present invention, as another form of explosive loading device 10', as shown in Figure 9, it is possible to use, for example, an explosive loading device 10 of the above-mentioned embodiment in which air packer members 35 are attached to a predetermined position of the insertion cylinder 11. That is, the explosive loading device 10' shown in Figure 9 has the same configuration as the explosive loading device 10 of the above-mentioned embodiment, and in addition, an air packer member 35 is provided. The air packer member 35 is formed so as to be deformable, preferably into a three-dimensional doughnut shape, when expanded by preferably pressure-fed air or water (see Figure 10), so as to fit closely to the outer circumferential surface of the insertion cylinder 11 and to fit closely to the working face 30a in a state where the gap between the opening edge of the blast hole 31 in the working face 30a and the outer circumferential surface of the insertion cylinder 11 is closed. The air packer member 35 is attached so as to be slidable in the axial direction along the insertion cylinder 11 before expansion.

[0039] 9, an auxiliary supply valve 36 is attached to the supply pipe 19 connected to the supply pipe connection valve part 15 provided at the rear end part 11b of the insertion cylinder 11, at a position branching off from the connection part with the supply pipe connection valve part 15. The other end of a pressure resistant hose 37, one end of which penetrates the air packer member 35 and opens on the hollow bit 13 side of the air packer member 35 (see FIG. 10), is connected to this auxiliary supply valve 36.

[0040] In the explosive loading device 10' shown in Figure 9, a plurality of pressure resistant hoses 37 are preferably provided, branching off from the other end connected to the auxiliary supply valve 36. One end of each pressure resistant hose 37 is disposed so as to extend along the insertion cylinder 11, as shown in Figure 10, and penetrates the air packer member 35. The open end face of one end of each pressure resistant hose 37 opens outward on the side of the air packer member 35 on the hollow bit 13 side, and a control valve 37a is attached to this open end face. Furthermore, an opening hole 37b that opens into the inside of the air packer member 35 is formed at the part of one end of each pressure resistant hose 37 that penetrates the air packer member 35. Air or water is supplied under pressure from the supply pipe 19 via the auxiliary supply valve 36 and flows into the air packer member 35 through the opening hole 37b, causing the air packer member 35 to expand preferably into a three-dimensional doughnut shape, so that the expanded air packer member 35 can be tightly attached to the outer peripheral surface of the insertion cylinder 11 and the opening periphery of the blast hole 31 on the working face 30a.

[0041] In addition, the control valve 37a attached to the open end face portion of one end of the pressure-resistant hose 37 is set so that air or water supplied under pressure from the supply pipe 19 flows into the inside of the air packer member 35 through the opening hole 37b and inflates the air packer member 35, and when the inside of the inflated air packer member 35 reaches a predetermined internal pressure, the control valve 37a is released and the air or water supplied under pressure can be sent from the side of the air packer member 35 on the hollow bit 13 side into, for example, the gap between the hole wall surface of the blast hole 31 and the outer peripheral surface of the insertion cylinder 11.

[0042] In the explosive loading device 10' shown in Figure 9, for example, if the hollow bit 13 is unable to crush obstructing residues such as rocks remaining in the blast hole 31 into small enough pieces to be sent rearward through the gap between the wall of the blast hole 31 and the outer surface of the hollow bit 13 and therefore unable to completely discharge them, it is possible to take these residues into the insertion cylinder 11 through the hollow penetration portion 13a of the hollow bit 13, pass them through the hollow interior of the insertion cylinder 11, and discharge them from the discharge branch pipe 16a.

[0043] That is, preferably after the completion of drilling, the auxiliary supply valve 36 is opened with the discharge valve 16 of the discharge branch pipe 16a open and the supply pipe connection valve 15 closed, and air or water is supplied by the pressure-resistant hose 37 under pressure, thereby expanding the packer element 35 moved near the opening periphery of the blasthole 31, and bringing it into close contact with the face 30a and the outer periphery of the insertion cylinder 11, thereby blocking the gap between the outer periphery of the insertion cylinder 11 at the face 30a and the opening periphery of the blasthole 31. Furthermore, for example, when the pressure inside the expanded packer reaches a predetermined internal pressure, the control valve 37a is preferably automatically released, allowing air or water to flow into the gap between the wall of the blasthole 31 and the outer periphery of the insertion cylinder 11. As a result, for example, any residue that has not been sufficiently crushed and remains between the outer surface of the insertion cylinder 11 and the wall surface of the blast hole 31 is swept away by the inflowing air or water and carried into the interior of the insertion cylinder 11 through the hollow through-hole 13a of the hollow bit 13 together with the air or water, and after being pushed backward so as to pass through the hollow interior of the insertion cylinder 11, it can be discharged from the opened discharge valve portion 16 of the discharge branch pipe 16a.

[0044] If the insertion cylinder 11 becomes clogged with residue carried inside, the auxiliary supply valve 36 is closed to stop the supply of air or water through the pressure-resistant hose 37, the discharge valve 16 is then closed, the insertion cylinder 11 is temporarily pulled out of the blast hole 31, and the supply pipe connection valve 15 is opened to supply air or water into the insertion cylinder 11, thereby discharging the clogged residue from the tip of the hollow bit 13. Once the residue has been discharged from inside the insertion cylinder 11, the supply pipe connection valve 15 and the discharge valve 16 are closed, and the pressure pipe connection valve 12 is opened, allowing the loading of explosives to begin. [Explanation of symbols]

[0045] 10,10' explosive loading device 11 Insertion cylinder 11a Tip 11b Rear end part 12 Pressure pipe connection valve 13 Hollow Bit 13a Hollow penetration 13b carbide tip 13c Connection base end part 13d Tip side part 13e Tapered part 14 Connection joint 14a Connecting sleeve 15 Supply pipe connection valve section 16 Exhaust valve section 16a Discharge branch pipe 17 Connecting arm 17a Connection base 18 Flex S Bull Piping 19 Supply piping 20 Heavy equipment for drilling 21 Face drilling machine 21b Guide Shell 22 Drifter (drilling machine body) 23 Drill Bit 24 Perforated Rod 25 Heavy machinery body 25a Outrigger 26 Mangauge (Working Floor) 27 Anti-rotation means 27a Locking rod 30 Ground at the face 30a Face 31 Blasthole 31a Hole end 32 Explosives 32a Parent die 32b Increase die 32c Anko wood 35 Packer member 36 Auxiliary supply valve 37 Pressure-resistant hose 37a Control valve 37b Opening hole X forward / backward axis direction

Claims

1. An explosive loading device is attached to a drilling machine body of a face drilling machine mounted on a drilling heavy machine for drilling blast holes in a face in a mountain tunnel construction method, and loads explosives into the formed blast holes, the insertion tube has a length that allows its tip portion to be inserted up to the vicinity of the end of the blast hole; a pressure pipe connection valve unit provided at the rear end portion of the insertion tube that can be opened and closed and to which a flexible pipe through which explosives are pressure-fed is connected, the pressure pipe connection valve unit connecting the flexible pipe to the rear end portion of the insertion tube; a hollow bit attached to the tip portion of the insertion tube and having a hollow through-hole with a cross-sectional shape similar to that of the hollow interior of the insertion tube; a connection joint unit that joins the explosive loading device to a drifter that forms the drilling machine body as a single unit in a state in which the insertion tube is extended parallel to the direction of the forward and backward axis of the drifter; and a supply pipe connection valve unit that can be opened and closed and to which a supply pipe that supplies air or water is connected to the rear end portion of the insertion tube, After drilling and forming the blast hole with a drilling rod having a drilling bit attached to the drifter of the face drilling machine, the drilling rod is replaced with the explosive loading device attached to the drifter, and the flexible pipe is connected to the pressure pipe connection valve section, and the supply pipe is connected to the supply pipe connection valve section, and then With the pressure pipe connection valve section closed, air or water is supplied from the supply pipe into the hollow interior of the insertion cylinder, and the hollow bit is inserted into the blast hole by moving it back and forth at high speed with the drifter to apply impacts while it reaches the vicinity of the end of the hole, thereby clearing the hole.After that, with the supply pipe connection valve section closed and the pressure pipe connection valve section open, explosives are pressure-fed through the flexible pipe and the insertion cylinder, and the pressure-fed explosives can be loaded into the end of the hole through the hollow penetration section of the hollow bit.

2. 2. An explosive loading device according to claim 1, wherein a drain valve portion that can be opened and closed is provided at the rear end portion of said insertion tube for draining water remaining in the hollow interior of said insertion tube.

3. 2. The explosive loading device according to claim 1, wherein a connection arm portion is integrally joined to the rear end portion of the insertion cylinder via a connection base portion, and extends parallel to the insertion cylinder on the rear side of the insertion cylinder, and the connection joint portion is attached to the rear end of the connection arm portion.

4. 4. The explosive loading device according to claim 3, wherein the connecting arm portion is provided with a rotation prevention means for engaging the drifter with a guide shell that guides the drifter in the axial direction, thereby preventing the insertion cylinder from shifting in its circumferential position relative to the drifter.

5. 2. An explosive loading device according to claim 1, wherein the outer peripheral surface of said hollow bit is provided with a tapered portion whose outer diameter decreases toward the tip.

6. 2. An explosive loading device according to claim 1, wherein an air packer member is attached to the insertion cylinder, and when the air packer member is supplied with air or water from the supply pipe and expands, it comes into close contact with the outer peripheral surface of the insertion cylinder and also with the opening edge of the blast hole in the face, and air or water is sent between the outer peripheral surface of the insertion cylinder and the hole wall surface of the blast hole from one end of a pressure-resistant hose passing through the air packer member.

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