Charge structure and charging method for blasting

Abstract

This invention proposes a charging structure and method for blasting. A plugging structure is incorporated into the borehole, dividing it lengthwise into at least two independent sealed spaces. Each sealed space contains at least one explosive charge, with an air gap between the charge and the borehole wall. All charges are connected by a detonating cord, which passes through the plugging structure, with one end extending beyond the borehole's bottom. This invention divides the borehole into at least two independent sealed spaces, each smaller than the entire borehole space. After the explosive charge in each sealed space detonates, the explosive gases in each space do not diffuse into other sealed spaces. The reduced space and freedom of movement of the explosive gases increase the destructive force of the blast. To achieve the same blasting effect, this charging structure reduces the amount of explosive used and minimizes the environmental hazards of the explosive gases.

Description

Technical Field

[0001] The invention belongs to the field of blasting engineering, and in particular relates to a charge structure and a charge method for blasting. Background Art

[0002] In tunnel excavation projects, blasting is widely used as a necessary excavation method. Generally speaking, the amount of explosives is large, the blasting intensity is high, and the range involved is far. In addition, different blasting types, explosive bag layout, explosive bag shape, charge structure, blockage conditions, etc. will affect the blasting seismic effect to varying degrees.

[0003] Air gap charging blasting technology has been gradually promoted and applied due to its advantages of reducing excavation costs and improving the utilization rate of explosives. The air gap charging method generally uses gun mud or other plugging materials to block the blasthole. The inner wall of the blasthole, the bottom of the blasthole and the plugging materials at the blasthole form a closed space. The blasting work can be carried out by igniting the explosive bag in the blasthole. During blasting, all the explosive bags are in a closed space. After the explosive bags in the blasthole explode, the activity space of the explosive gas is relatively large, the degree of freedom of movement is large, and the destructive power of the blasting is relatively reduced; in order to increase the destructive power of the blasting, it is necessary to increase the amount of explosive bags, but it is harmful to the environment. Summary of the invention

[0004] The present invention aims to solve the technical problems existing in the prior art. The first object of the present invention is to provide a blasting charge structure, which divides a blast hole into a plurality of independent enclosed spaces, so as to solve the technical problem that the prior art only uses one enclosed space, resulting in a relatively small destructive force of blasting. The second object of the present invention is to provide a blasting charge method for loading the above-mentioned blasting charge structure into a blast hole.

[0005] To achieve the first object, the present invention adopts the following technical solution: a blasting charge structure, a blocking structure is provided in a blasthole, the blocking structure divides the blasthole into at least two independent closed spaces along the length direction, the blocking structure includes an end blocking structure provided at the blasthole, and a middle blocking structure provided between the two closed spaces;

[0006] There is at least one explosive pack in each enclosed space, and there is an air gap between the explosive pack and the inner wall of the blasthole. All the explosive packs are connected by detonating cord detonators, which pass through the blocking structure. The end of the detonating cord detonator away from the bottom of the blasthole extends out of the blasthole of the blasthole.

[0007] In the above technical solution, the blast hole is divided into at least two independent enclosed spaces, each of which is smaller than the entire blast hole space. After the explosive bag in each enclosed space explodes, the explosion gas in each enclosed space will not diffuse into other enclosed spaces, the activity space of the explosion gas is reduced, the degree of freedom of activity is reduced, and the destructive force of the explosion is increased. When the same blasting effect needs to be achieved, the charge structure of the present invention can reduce the amount of explosives used and reduce the harm of the explosion gas to the environment.

[0008] In a preferred embodiment of the present invention, the end plugging structure includes a first outer plug and a first inner plug, the first outer plug and the first inner plug are connected by a cone, and the large end of the cone connection is located in a closed space; during explosion, the end plugging structure can be axially self-locking.

[0009] The cone connection structure is self-locking and has a simple structure.

[0010] In a preferred embodiment of the present invention, the middle blocking structure includes two oppositely arranged end blocking structures, the ends of the two first inner plugs close to each other have a gap, and the large ends of the two end blocking structures connected by cones are far away from each other; during explosion, the middle blocking structure can be axially self-locking.

[0011] Only one end blocking structure is set in two adjacent confined spaces, or two end blocking structures are connected in series, which is a one-way self-locking structure and cannot play the role of separating confined spaces. The middle blocking structure of this scheme can self-lock the middle blocking structure when two adjacent confined spaces explode due to the explosion impact pressure generated by the two confined spaces, which is a two-way self-locking structure.

[0012] In a preferred embodiment of the present invention, the middle blocking structure includes a second outer plug and two second inner plugs, the two second inner plugs are respectively connected to the two end cones of the second outer plug, and the large ends of the two cones are far away from each other; during explosion, the middle blocking structure can be axially self-locking.

[0013] In the above technical solution, the two second inner plugs are arranged back to back to achieve two-way self-locking. Compared with the structure composed of two end plugging structures, the middle plugging structure of this solution can prevent construction workers from installing incorrectly and avoid the occurrence of one-way self-locking.

[0014] In a preferred embodiment of the present invention, the first outer plug has a first tapered hole, the first inner plug has a first head and a first outer cone body matched with the first tapered hole, and the first inner plug is connected to the first tapered hole of the first outer plug through the first outer cone body;

[0015] The large end of the first outer cone is close to the first head, which is located in the closed space of the blasthole. There is a gap between the outer wall of the first head and the inner wall of the blasthole. The nominal outer diameter of the first outer plug is equal to the nominal inner diameter of the blasthole.

[0016] There is a gap between the outer wall of the first head and the inner wall of the blast hole, so that during explosion, the axial movement of the first inner plug is not restricted by the inner wall of the blast hole.

[0017] In another preferred embodiment of the present invention, the second outer plug has two second tapered holes arranged opposite to each other, and each of the second inner plugs has a second head and a second outer cone body matched with the second tapered hole, and the two second inner plugs are respectively connected to the two second tapered holes of the second outer plug through the second outer cone body;

[0018] The large end of the second outer cone is close to the second head. The two second heads are respectively located in two adjacent closed spaces. There is a gap between the outer wall of the second head and the inner wall of the blasthole. The nominal outer diameter of the second outer plug is equal to the nominal inner diameter of the blasthole.

[0019] In another preferred embodiment of the present invention, the intermediate plugging structure further comprises a connecting pipe, which axially penetrates the center of the second outer plug and the two second inner plugs, and both ends of the connecting pipe are connected with anti-slip rings, and the detonating cord detonator can pass through the anti-slip rings and the connecting pipe. After the connecting pipe and the anti-slip rings are provided, the second outer plug and the two second inner plugs are fixed as a whole, and the on-site operation is more convenient.

[0020] In another preferred embodiment of the present invention, the side wall of the first outer plug has an open groove extending through the side wall along its length, and the side wall of the second outer plug also has an open groove extending through the side wall along its length.

[0021] In another preferred embodiment of the present invention, each enclosed space has a rigid support block that can fit with the inner wall of the blast hole, and the second outer plugs are fixedly connected to the support blocks of the corresponding enclosed spaces.

[0022] This makes it easier for construction workers to load the charge structure into the blast hole by pushing the support block into the blast hole, making the operation more convenient.

[0023] In order to achieve the above second object, the present invention adopts the following technical solution: a blasting charging method, which utilizes the above blasting charging structure, comprises the following steps:

[0024] Step 1, fix the medicine bag and the middle blocking structure on the support block corresponding to the closed space to form a medicine loading segment;

[0025] Step 2, connecting the detonator of the detonating cord to the explosive package in each confined space, and passing the detonator of the detonating cord through the middle blocking structure;

[0026] Step 3, push each charge segment into the blast hole by pushing the support block, or after all the support blocks are fixedly connected into a whole along the length direction, push the whole into the blast hole;

[0027] Step 4, installing the end plugging structure at the blasthole of the blasthole, and allowing the detonator of the detonating cord to pass through the end plugging structure and be located outside it.

[0028] The beneficial effects of the above technical solution are as follows: Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 It is a longitudinal (along the length direction) cross-sectional schematic diagram of the blasting charge structure of Example 1 of the present application.

[0031] Figure 2 yes Figure 1 A magnified view of the end plugging structure in FIG.

[0032] Figure 3 yes Figure 2 AA section view in.

[0033] Figure 4 yes Figure 1 A magnified view of the middle plugging structure in .

[0034] Figure 5 It is a schematic longitudinal cross-sectional view of the blasting charge structure of the second embodiment of the present application.

[0035] The figure marks in the drawings of the specification include: blasthole 10, blasthole 11, end blocking structure 20, first outer plug 21, first tapered hole 211, opening groove 212, first inner plug 22, first outer cone 221, first head 222, block 23, through-tube hole 24, middle blocking structure 30, second outer plug 31, second tapered hole 311, second inner plug 32, second outer cone 321, second head 322, connecting pipe 33, anti-slip ring 34, medicine bag 40, air gap 50, detonating cord detonator 60, pressure relief and vibration reduction layer 70, support block 80. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "vertical", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0039] Embodiment 1

[0040] This embodiment provides a charge structure for blasting, such as Figure 1 As shown, in a preferred embodiment, for example, the blasthole 10 is arranged horizontally, and the blasthole 11 of the blasthole 10 is at the right end. A blocking structure is provided in the blasthole 10, and the blocking structure divides the blasthole 10 into at least two independent closed spaces along the length direction. This embodiment is described by taking the blasthole 10 as an example to be divided into three independent closed spaces, which are closed space I, closed space II and closed space III from left to right. The blocking structure includes an end blocking structure 20 provided at the blasthole 11, and a middle blocking structure 30 provided between the two closed spaces, which are blocking structure A, blocking structure B and blocking structure C from left to right. Each closed space has at least one medicine bag 40, Figure 1 Shown in the figure are two intervally arranged medicine bags 40, with air gaps 50 between the medicine bags 40 and between the medicine bags 40 and the inner wall of the blast hole 10, all the medicine bags 40 are connected by detonating cord detonators 60, the detonating cord detonators 60 pass through the blocking structure, and the right end of the detonating cord detonator 60 extends out of the blast hole 11 of the blast hole 10.

[0041] In this embodiment, the manufacture of the explosive package 40 and the connection between the explosive package 40 and the detonator 60 are both based on the existing technology, which is not the innovation of the present invention and will not be described in detail here.

[0042] The charge structure of the present invention divides the blast hole 10 into three independent enclosed spaces, each of which is equivalent to one third of the size of the entire blast hole 10. After the explosion of the drug pack 40 in each enclosed space, the explosive gas in each enclosed space will not diffuse into other enclosed spaces, the activity space of the explosive gas is reduced, the degree of freedom of activity is reduced, and the destructive force of the blasting is increased. Therefore, when it is necessary to achieve the same blasting effect, dividing the blast hole 10 into two or more enclosed spaces can reduce the amount of explosives used, thereby reducing the harm of the explosive gas to the environment.

[0043] like Figure 2 As shown, in this embodiment, the end plugging structure 20 includes a first outer plug 21 and a first inner plug 22. The first outer plug 21 and the first inner plug 22 are connected by a cone, and the large end of the cone connection is located in the closed space III, that is, the large end is located on the left and the small end is located on the right; during explosion, the end plugging structure 20 can be axially self-locking.

[0044] Specifically, the first outer plug 21 has a first tapered hole 211, the first inner plug 22 has a first head 222, the right end of the first head has a first outer cone 221 that matches the first tapered hole 211, the large end of the first outer cone 221 is arranged close to the first head 222, and the first inner plug 22 is conically connected to the first tapered hole 211 of the first outer plug 21 through the first outer cone 221. There is a gap between the outer wall of the first head 222 and the inner wall of the blasthole 10, and the nominal outer diameter of the first outer plug 21 is equal to the nominal inner diameter of the blasthole.

[0045] In order to assemble the first outer plug 21 and the first inner plug 22 into a whole, a stopper 23 is fixedly connected to the right end of the first inner plug 22 outside the first outer plug 21, such as by welding or threading. The middle of the first inner plug 22 has an axially penetrating through-hole 24, and the detonating cord detonator 60 can pass through the through-hole 24 in the middle of the first inner plug 22.

[0046] like Figure 4 As shown, the middle blocking structure 30 includes a second outer plug 31 and two second inner plugs 32. The two second inner plugs 32 are respectively connected to the two end cones of the second outer plug 31, and the large ends of the two cones are far away from each other. During blasting, both ends of the middle blocking structure can be axially self-locked, that is, bidirectional self-locking.

[0047] Specifically, the second outer plug 31 has two second tapered holes 311 arranged opposite to each other, and each of the second inner plugs 32 has a second head 322 and a second outer cone 321 matched with the second tapered hole 311, and the two second inner plugs 32 are respectively connected to the two second tapered holes 311 of the second outer plug 31 through the second outer cone 321. The large end of the second outer cone 321 is close to the second head 322, and the two second heads 322 are respectively located in two adjacent closed spaces, and there is a gap between the outer wall of the second head 322 and the inner wall of the blasthole 10, and the nominal outer diameter of the second outer plug 31 is equal to the nominal inner diameter of the blasthole 10.

[0048] In order to assemble the second outer plug 31 and the two second inner plugs 32 into a whole, the middle blocking structure 30 also includes a connecting pipe 33, which axially penetrates the center of the second outer plug 31 and the two second inner plugs 32, and both ends of the connecting pipe 33 are connected with anti-slip rings 34, such as welding or threaded connections, and the through hole in the middle of the connecting pipe 33 is a through-tube hole 24, and the detonating cord detonator 60 can pass through the anti-slip ring 34 and the through-tube hole 24 in the middle of the connecting pipe 33.

[0049] Alternatively, if Figure 3 As shown, the side wall of the first outer plug 21 has an opening slot 212 extending through the side wall along the length direction thereof. The side wall of the second outer plug 31 also has an opening slot 212 extending through the side wall along the length direction thereof.

[0050] In this embodiment, the outer plug and the inner plug in the plugging structure are made of relatively hard and rigid materials. The contact conical surfaces of the first outer plug 21 and the first inner plug 22, as well as the contact conical surfaces of the second outer plug 31 and the two second inner plugs 32 are relatively smooth, which reduces friction and facilitates the axial movement of the inner plugs during blasting; the outer walls of the first outer plug 21 and the second outer plug 31 are relatively rough or have patterns perpendicular to their axes, which increases friction.

[0051] During blasting, for example, during the explosion of the explosive package 40 in the enclosed space I, the second inner plug 32 on the left side of the blocking structure A moves to the right due to the impact pressure of the explosion on the left end face of the second head 322, while the second outer plug 31 only slightly moves to the right or does not move due to its own inertia, the small contact area between its left end face and the explosion gas, and the friction with the inner wall of the blast hole 10. The second inner plug 32 moves to the right relative to the second outer plug 31, causing the second outer plug 31 to expand radially outward, increasing the positive pressure between the second outer plug 31 and the inner wall of the blast hole 10, thereby increasing the friction between the second outer plug 31 and the inner wall of the blast hole 10. When the friction between the second outer plug 31 and the inner wall of the blast hole 10 is sufficient to resist the axial rightward thrust generated by the explosion of the explosive package 40 in the enclosed space I and borne by the left second inner plug 32, self-locking is achieved.

[0052] Similarly, during the explosion of the medicine package 40 in the confined space II, when the friction force of the second outer plug 31 of the blocking structure A on the inner wall of the blast hole 10 is sufficient to resist the axial left thrust borne by the second inner plug 32 on the right due to the explosion of the medicine package 40 in the confined space II, self-locking is achieved; at the same time, when the friction force of the second outer plug 31 of the blocking structure B on the inner wall of the blast hole 10 is sufficient to resist the axial right thrust borne by the second inner plug 32 on the left due to the explosion of the medicine package 40 in the confined space II, self-locking is achieved.

[0053] Similarly, during the explosion of the medicine package 40 in the confined space III, when the friction force of the second outer plug 31 of the blocking structure B on the inner wall of the blast hole 10 is sufficient to resist the axial left thrust borne by the second inner plug 32 on the right side due to the explosion of the medicine package 40 in the confined space III, self-locking is achieved; at the same time, when the friction force of the first outer plug 21 of the blocking structure C on the inner wall of the blast hole 10 is sufficient to resist the axial right thrust borne by the first inner plug 22 due to the explosion of the medicine package 40 in the confined space III, self-locking is achieved.

[0054] That is, during an explosion, the second inner plug 32 on the left side of the middle blocking structure 30 moves rightward relative to the second outer plug 31, and the second inner plug 32 on the right side moves leftward relative to the second outer plug 31, thereby achieving axial self-locking of the middle blocking structure 30, which is a two-way self-locking.

[0055] Depending on the actual situation, the explosive packages 40 in each confined space can explode sequentially or simultaneously.

[0056] like Figure 1 As shown, in another preferred embodiment, a pressure relief and vibration reduction layer 70 is provided at the bottom of the blasthole 10, so that the rock at the bottom of the blasthole 10 is less affected by the blasting as possible, and the pressure relief and vibration reduction layer 70 can be a foam layer.

[0057] like Figure 1 As shown, in another preferred embodiment, the bottom of each enclosed space has a rigid support block 80 that can fit with the inner wall of the blast hole 10, and the second outer plug 31 of the intermediate blocking structure 30 is fixedly connected to the support block 80 of the corresponding enclosed space, for example, the second outer plug 31 of the blocking structure A is fixedly connected to the support block 80 in the enclosed space I, and the second outer plug 31 of the blocking structure B is fixedly connected to the support block 80 in the enclosed space II.

[0058] Embodiment 2

[0059] The structural principle of this embodiment is basically the same as that of the first embodiment, except that in this embodiment, the specific structure of the intermediate blocking structure 30 is different, such as Figure 5As shown, the middle blocking structure 30 includes two oppositely arranged end blocking structures 20, and the two first inner plugs 22 have a gap a at one end close to each other. During explosion, the left first inner plug 22 has a space to move to the right, and the right first inner plug 22 has a space to move to the left. The large ends of the two end blocking structures 20 connected by cones are away from each other, that is, the large end of the left first inner plug 22 is located on the left, and the large end of the right first inner plug 22 is located on the right.

[0060] It should be pointed out that the above two embodiments only illustrate one implementation of the end plugging structure 20. In practice, the end plugging structure 20 may also adopt other structures of the prior art, such as the plugging plug disclosed in CN2177222Y.

[0061] Embodiment 3

[0062] This embodiment discloses a method for charging blasting charges by loading the blasting charge structure of the first embodiment or the second embodiment into a blast hole 10, which comprises the following steps:

[0063] Step 1, the pressure relief and vibration reduction layer 70, the medicine bag 40 and the middle blocking structure 30 are fixedly installed on the support block 80 corresponding to the enclosed space to form a charging segment. Among them, the end blocking structure 20 is not fixed on the support block 80 first, and it blocks the blast hole 11 at the end. The pressure relief and vibration reduction layer 70 can be bonded to the support block 80, and the outer plugs (first outer plug 21, second outer plug 31) of the blocking structure can be welded to the support block 80. When fixing the medicine bag 40, the following method can be used: nails are driven into the two diagonal positions of the medicine bag 40 on the support block 80, and then the corners of the medicine bag 40 are tied to the nails of the support block 80 with ropes, thereby fixing the position of the medicine bag 40. Compared with directly tying the medicine bag to the support block 80, this method can avoid the rope being worn off by the inner wall of the blast hole when the charging structure is pushed into the blast hole 10. Of course, other methods can also be used to fix the medicine bag.

[0064] Step 2, connecting the detonator 60 to the explosive package 40 in each confined space, and passing the detonator 60 through the lead hole of the middle blocking structure 30.

[0065] Step 3, push each charge segment into the blasthole 10 by pushing the support block 80, or after all the support blocks 80 are fixedly connected into a whole along the length direction, push the whole into the blasthole 10. When there are structures to be protected around the blasthole 10, the support block 80 is made of steel plate, and the support block 80 is located on one side of the protected structure to play a vibration isolation role; when the surrounding area of ​​the blasthole 10 needs to be blasted, the support block 80 can be made of hard plastic.

[0066] Step 4, install the end plugging structure 20 at the blast hole 11 of the blast hole 10, and make the right end of the detonator 60 pass through the end plugging structure 20 and be located outside it.

[0067] When the depth of the blast hole 10 is shallow, people weld the support blocks 80 in the three enclosed spaces together, and then push the entire charge structure into the blast hole 10; when the depth of the blast hole 11 is deep, people divide the entire charge structure into multiple sections, such as one enclosed space corresponding to one section, and then push it into the blast hole 10 section by section.

[0068] In order to ensure that the outer wall of the second outer plug 31 can contact the inner wall of the blast hole 10 in a full circle, when the second outer plug 31 is fixedly connected to the support block 80, the support block 80 is fixedly connected to the left and right end faces of the second outer plug 31, such as by welding.

[0069] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A charge structure for blasting, characterized in that: A blocking structure is provided in the blasthole, which divides the blasthole into at least two independent closed spaces along the length direction, and the blocking structure includes an end blocking structure provided at the blasthole and a middle blocking structure provided between the two closed spaces; At least two axially spaced charge packs are arranged in each section of the enclosed space, with an air gap between the charge packs and the inner wall of the blast hole, all charge packs are connected by detonating cord detonators, the detonating cord detonators pass through the blocking structure, and one end of the detonating cord detonator away from the bottom of the blast hole extends out of the blast hole of the blast hole; The end plugging structure comprises a first outer plug and a first inner plug, the first outer plug and the first inner plug are connected by a cone, and the large end of the cone connection is located in a closed space; during blasting, the end plugging structure can be axially self-locked; The middle plugging structure comprises two oppositely arranged end plugging structures, one end of the two first inner plugs close to each other has a gap, the large ends of the two end plugging structures connected by cones are far away from each other, and the middle plugging structure can be axially self-locked during explosion; or the middle plugging structure comprises a second outer plug and two second inner plugs, the two second inner plugs are respectively connected to the two end cones of the second outer plug, the large ends of the two cones are far away from each other, and the middle plugging structure can be axially self-locked during explosion; Each enclosed space has a rigid support block that can fit with the inner wall of the blast hole, and the second outer plug is fixedly connected to the support block of the corresponding enclosed space.

2. The blasting charge structure according to claim 1, characterized in that: The first outer plug has a first tapered hole, the first inner plug has a first head and a first outer cone body matched with the first tapered hole, and the first inner plug is connected to the first tapered hole of the first outer plug through the first outer cone body; The large end of the first outer cone is close to the first head, which is located in the closed space of the blasthole. There is a gap between the outer wall of the first head and the inner wall of the blasthole. The nominal outer diameter of the first outer plug is equal to the nominal inner diameter of the blasthole.

3. The blasting charge structure according to claim 2, characterized in that: The second outer plug has two second tapered holes arranged opposite to each other, and the second inner plugs each have a second head and a second outer cone body matched with the second tapered hole, and the two second inner plugs are respectively connected to the two second tapered holes of the second outer plug through the second outer cone body; The large end of the second outer cone is close to the second head, and the two second heads are respectively located in two adjacent closed spaces. There is a gap between the outer wall of the second head and the inner wall of the blasthole, and the nominal outer diameter of the second outer plug is equal to the nominal inner diameter of the blasthole.

4. The blasting charge structure according to claim 3, characterized in that: The intermediate blocking structure also includes a connecting pipe, which axially penetrates the center of the second outer plug and the two second inner plugs. Both ends of the connecting pipe are connected with anti-slip rings, and the detonating cord detonator can pass through the anti-slip rings and the inside of the connecting pipe.

5. The blasting charge structure according to claim 4, characterized in that: The side wall of the first outer plug has an open groove extending through the side wall along the length direction thereof, and the side wall of the second outer plug also has an open groove extending through the side wall along the length direction thereof.

6. A blasting charging method, using the blasting charging structure according to any one of claims 1 to 5, characterized in that: The steps include: Step 1, fix the medicine bag and the middle blocking structure on the support block corresponding to the closed space to form a medicine loading segment; Step 2, connecting the detonator of the detonating cord to the explosive package in each confined space, and passing the detonator of the detonating cord through the middle blocking structure; Step 3, push each charge segment into the blast hole by pushing the support block, or after all the support blocks are fixedly connected into a whole along the length direction, push the whole into the blast hole; Step 4, installing the end plugging structure at the blasthole of the blasthole, and allowing the detonator of the detonating cord to pass through the end plugging structure and be located outside it.

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