Non-detonating cord three-section smooth blasting charging structure

Abstract

The invention discloses a detonating cord-free three-section smooth blasting charge structure, which is characterized in that a detonating cord used in the traditional smooth blasting is cancelled, a three-section charge layout is adopted in a peripheral hole, the detonating cord-free three-section smooth blasting charge structure comprises a rear-end charged charge, a main charging charge and a front-end charged charge which are sequentially arranged at intervals, a detonator is arranged in the main charging charge, and the main charging charge and the front-end charged charge are sequentially detonated according to a sympathetic detonation principle; the rear-end explosive bag to be launched comprises two sections of cartridges, the main explosive bag to be launched comprises 1-2 sections of cartridges, the front-end explosive bag to be launched comprises one section of cartridge, the spacing distance of all the cartridges is controlled to be 53-63 cm, hole bottom reverse detonation is adopted to be matched with a wet paper shell and a plastic film to block a blast hole, and millisecond delay detonation with a main blast hole is achieved through one-time segmented delay detonation. According to the method, detonating cord detonation is replaced by sympathetic detonation, the construction procedure is simplified, the material cost and the safety risk are reduced, it is ensured that boundary surrounding rock is stable, flat and smooth and free of serious damage or root ridge residues after detonation, and the method is suitable for blasting peripheral holes of underground space projects such as underground mines and tunnels, has remarkable economical efficiency and safety and is easy to popularize.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground engineering blasting, in particular to a three-section smooth blasting charge structure without detonating cord. BACKGROUND

[0002] With the rapid development of underground space engineering (such as mining, tunnel excavation, etc.), smooth blasting as a key technology to control engineering boundary shaping and protect surrounding rock stability is increasingly widely used. The traditional charge structure of smooth blasting usually adopts the combination of detonating cord + detonator + bamboo chip, specifically, the detonating cord is laid along the full length in the peripheral hole, the explosive charge is fixed beside the detonating cord through the bamboo chip, the detonating cord is ignited by the detonator, and then the explosive charge is sequentially ignited by the detonating cord.

[0003] However, the traditional charge structure has many drawbacks, such as:

[0004] Firstly, it is inefficient, the detonating cord, bamboo chip and explosive charge need to be bound segment by segment, the process is complex, the charge time is long, and it seriously affects the construction progress;

[0005] Secondly, it is costly, the procurement and processing cost of materials such as detonating cord and bamboo chip is high, and the consumption of detonating cord increases significantly with the increase of the length of the blast hole, which increases the total cost of the project;

[0006] Thirdly, it has prominent safety hazards, the processing quality and storage conditions of the detonating cord directly affect the reliability of initiation, and if there are problems such as fracture and moisture of the detonating cord, it is easy to cause misfire accidents, and the cutting and connecting operations of the detonating cord have certain safety risks;

[0007] Fourthly, it has limited adaptability, for underground engineering under different geological conditions, the traditional structure is difficult to flexibly adjust the charge parameters, and it is difficult to balance the blasting effect and surrounding rock protection.

[0008] Therefore, it is an urgent need in the field of underground engineering blasting to develop a simple structure, convenient operation, low cost and safe and reliable smooth blasting charge structure without detonating cord. SUMMARY

[0009] The purpose of the present application is to at least solve one of the above technical problems to some extent.

[0010] To this end, the present application aims to provide a three-section smooth blasting charge structure without detonating cord, a new charge structure based on the principle of sympathetic detonation, i.e. eliminating the detonating cord and bamboo chip, directly initiating the explosive by the detonating tube detonator, and using the characteristics of explosive sympathetic detonation to sequentially initiate the explosive charge in the peripheral hole. This structure can simplify the construction process, reduce the material cost, and reduce the safety problems caused by the detonating cord.

[0011] To achieve the above object, one embodiment of the present application provides a non-detonating cord three-section smooth blasting charge structure, comprising:

[0012] A blast hole, and a three-section charge structure arranged in the blast hole;

[0013] The three-section charge structure comprises a rear-end primed charge, a main primed charge and a front-end primed charge arranged in sequence with a spacing distance; the main primed charge is provided with a detonator; the spacing distance between the rear-end primed charge and the main primed charge is 53-63 cm; the spacing distance between the main primed charge and the front-end primed charge is 53-63 cm; the three-section charge structure is not provided with a detonating cord; the main primed charge sequentially detonates the rear-end primed charge and the front-end primed charge through the sympathetic detonation principle.

[0014] According to one embodiment of the present application, the non-detonating cord three-section smooth blasting charge structure according to claim 1, the rear-end primed charge comprises two charge cartridges, the main primed charge comprises one to two charge cartridges, and the front-end primed charge comprises one charge cartridge.

[0015] According to one embodiment of the present application, when the main primed charge is arranged close to the bottom, the main primed charge comprises two charge cartridges.

[0016] According to one embodiment of the present application, the detonator is a detonating tube detonator or a digital detonator.

[0017] According to one embodiment of the present application, a hole bottom reverse initiation mode is adopted, the main primed charge is arranged close to the hole bottom, and the rear-end primed charge is located at the hole bottom.

[0018] According to one embodiment of the present application, the blast hole comprises a peripheral hole and an auxiliary hole, the three-section charge structure is arranged in the peripheral hole, the peripheral hole is located at the left wall and the vault of the underground engineering, and the auxiliary hole is arranged at the right wall of the underground engineering.

[0019] According to one embodiment of the present application, the blast hole comprises a peripheral hole and an auxiliary hole, the three-section charge structure is arranged in the peripheral hole, the peripheral hole is located at the left wall and the vault of the underground engineering, and the auxiliary hole is arranged at the right wall of the underground engineering.

[0020] According to one embodiment of the present application, the present application further comprises an initiation system matched with the blast hole, the initiation system adopts a one-time segmented delay initiation method, the peripheral hole corresponding to the smooth blasting hole is arranged as 21-22 segments, the main blast hole is arranged as 1-20 segments, and the delay time of the peripheral hole and the main blast hole is 110 ms.

[0021] According to one embodiment of the present application, the diameter of the charge cartridge is 32 mm.

[0022] According to one embodiment of the present application, the number of the blast holes is 11, and each blast hole is provided with a mark on the surrounding rock.

[0023] Additional aspects and advantages of the present application will be set forth in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the present application.

[0024] Compared with the prior art, the embodiment of the present application has the beneficial effects that:

[0025] The present application provides a three-section smooth blasting charge structure without detonating cord, compared with the traditional charge mode using detonating cord, the new charge mode cancels the use of detonating cord, greatly reduces the material cost and improves the work efficiency.

[0026] The present application provides a three-section smooth blasting charge structure without detonating cord, and proposes a new charge structure based on the principle of sympathetic detonation, that is, the detonating cord and bamboo chips are cancelled, the explosive is directly initiated by the detonating tube detonator, and the characteristics of sympathetic detonation of the explosive are used to realize the sequential initiation of the charge in the surrounding holes.

[0027] The present application provides a three-section smooth blasting charge structure without detonating cord, which cancels the charge structure of long-term use of detonating cord in underground mine construction by initiating explosive through sympathetic detonation.

[0028] The present application provides a three-section smooth blasting charge structure without detonating cord, which cancels the charge structure of long-term use of detonating cord in underground mine construction by initiating explosive through sympathetic detonation.

[0029] In order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to let the above and other purposes, characteristics and advantages of the present application can be more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described below. Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be realized by practicing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to make the technical solutions in the present application clearer, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings described in the following embodiments are only some of the embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0031] Figure 1 is a longitudinal sectional structure schematic diagram of a blast hole in a three-section smooth blasting charge structure without detonating cord according to an embodiment of the present application;

[0032] Figure 2 is a layout structure schematic diagram of an initiation system in a three-section smooth blasting charge structure without detonating cord according to an embodiment of the present application;

[0033] Figure 3 is a charge structure schematic diagram in a three-section smooth blasting charge structure without detonating cord according to an embodiment of the present application;

[0034] Reference signs:

[0035] 1-blast hole; 11-peripheral hole; 12-assistant hole; 13-plugging structure; 131-wet paper shell; 132-plastic film;

[0036] 2-three-section charge structure; 21-rear end charged charge; 22-main charged charge; 23-front end charged charge;

[0037] 3-initiation system. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0039] With the rapid development of underground space engineering, smooth blasting as a key technology for controlling engineering boundary shaping and protecting surrounding rock stability is increasingly widely used. The charge structure of traditional smooth blasting usually adopts the combination of detonating cord + detonator + bamboo sheet, specifically, the detonating cord is laid along the full length in the peripheral hole, the explosive cartridge is fixed beside the detonating cord through the bamboo sheet, the detonating cord is initiated by the detonator, and then the explosive cartridge is sequentially initiated by the detonating cord.

[0040] However, the traditional charging structure has many disadvantages. Firstly, it is inefficient, and the detonating cord and bamboo chips and cartridges need to be bound segment by segment, which is complex and time-consuming, seriously affecting the construction progress. Secondly, the cost is high, and the procurement and processing cost of the detonating cord and bamboo chips is high, and the consumption of the detonating cord increases significantly with the increase of the blast hole length, which increases the total cost of the project. Thirdly, there are prominent safety hazards, and the processing quality and storage conditions of the detonating cord directly affect the reliability of the initiation, and if there are problems such as breakage and dampness of the detonating cord, it is easy to cause misfire accidents, and the cutting and connecting operations of the detonating cord have certain safety risks. Fourthly, the adaptability is limited, and for underground engineering with different geological conditions, the traditional structure is difficult to adjust the charging parameters flexibly, and it is difficult to balance the blasting effect and surrounding rock protection.

[0041] Based on the above, it is an urgent need in the field of underground engineering blasting to develop a simple structure, convenient operation, low cost and safe and reliable non-detonating cord smooth blasting charging structure.

[0042] Therefore, the purpose of the present application is to provide a non-detonating cord three-section smooth blasting charging structure, and a new charging structure based on the principle of sympathetic detonation, that is, to cancel the detonating cord and bamboo chips, to directly initiate the explosive by the detonating tube detonator, and to realize the sequential initiation of the cartridges in the surrounding holes by using the characteristics of the explosive sympathetic detonation. This structure can simplify the construction process, reduce the material cost, and reduce the safety problems caused by the detonating cord.

[0043] Specifically, a non-detonating cord three-section smooth blasting charging structure according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0044] Figure 1 is a longitudinal sectional structure schematic diagram of a blast hole in the non-detonating cord three-section smooth blasting charging structure according to an embodiment of the present application, Figure 2 is a layout structure schematic diagram of an initiation system in the non-detonating cord three-section smooth blasting charging structure according to an embodiment of the present application, Figure 3 is a cartridge structure schematic diagram in the non-detonating cord three-section smooth blasting charging structure according to an embodiment of the present application

[0045] Please refer to Figures 1-3 The present embodiment provides a non-detonating cord three-section smooth blasting charging structure, which comprises:

[0046] a blast hole 1, and a three-section cartridge structure 2 arranged in the blast hole 1;

[0047] The three-section type charge package structure 2 comprises a rear end non-initiated charge package 21, a main charge package 22 and a front end non-initiated charge package 23 which are sequentially and spaced apart; the main charge package 22 is provided with a detonator; the interval distance between the rear end non-initiated charge package 21 and the main charge package 22 is 53-63 cm; the interval distance between the main charge package 22 and the front end non-initiated charge package 23 is 53-63 cm; the three-section type charge package structure 2 is not provided with a detonating cord; the main charge package 22 sequentially detonates the rear end non-initiated charge package 21 and the front end non-initiated charge package 23 through sympathetic detonation principle.

[0048] It should be noted that the core composition of the charge structure is determined, that is, the traditional detonating cord is cancelled, the three-section type layout of the rear end non-initiated charge package 21+the main charge package 22+the front end non-initiated charge package 23 is adopted, the shock wave and the detonation gas generated by the detonation of the main charge package 22 are used to trigger the initiation of the front and rear non-initiated charge packages through the sympathetic detonation principle. The interval distance of 53-63 cm is determined based on the theoretical sympathetic detonation distance of the rock emulsion explosive under the constraint condition, and the safety and the initiation reliability are considered.

[0049] In the above manner, the detonating cord is cancelled, the material cost and the safety risk of the detonating cord processing and storage link are reduced, the three-section type structure realizes the orderly initiation through sympathetic detonation, the complex process of the traditional detonating cord+the detonator is simplified, the charging efficiency is improved, meanwhile, the reasonable interval distance ensures the stable sympathetic detonation effect, the misfire accident is avoided, and the blasting safety is improved.

[0050] In an embodiment of the present application, the rear end non-initiated charge package 21 comprises two charge columns, the main charge package 22 comprises 1-2 charge columns, and the front end non-initiated charge package 23 comprises one charge column.

[0051] It should be noted that the number of charge columns of the charge package is designed according to the blasting energy demand and the sympathetic detonation transmission law, specifically, the rear end non-initiated charge package 21 needs to withstand the resistance of the rock at the hole bottom, two charge columns are arranged to ensure the blasting energy, the main charge package 22 serves as an initiation source, 1-2 charge columns can be adjusted according to the hardness of the rock at the hole position (two charge columns are used when the hardness is high, and one charge column is used when the hardness is low), and one charge column of the front end non-initiated charge package 23 can meet the boundary shaping demand.

[0052] In the above manner, the number of charge columns is configured as required, the waste of explosives is avoided, the cost is reduced, the reasonable energy distribution is achieved to ensure that the boundary is flat after blasting, the damage to the surrounding rock is reduced, and the adaptability is improved by flexibly adjusting the number of main charge columns to adapt to different geological conditions.

[0053] In an embodiment of the present application, when the main charge package 22 is arranged close to the bottom, the main charge package 22 comprises two charge columns.

[0054] It should be noted that the rock at the bottom position is usually affected by geological structure, poor integrity or bears greater surrounding rock pressure, and higher initial energy is required for blasting to ensure the effect of sympathetic detonation and rock breaking. Therefore, the main charge bag 22 near the bottom is increased to 2 sections, the transmission efficiency of sympathetic detonation is enhanced by increasing the detonation energy, and the misfire or incomplete blasting of the fired charge bag caused by insufficient energy is avoided.

[0055] In the above manner, the initiation energy at the bottom position is targeted to enhance the reliability of sympathetic detonation under complex geological conditions, to avoid problems such as root gap and residual rock mass at the bottom, to reduce the subsequent cleaning process, to improve the construction efficiency, and to adapt to the geological differences of different hole positions to ensure the uniformity of the overall blasting effect.

[0056] In an embodiment of the present application, the detonator is a detonating tube detonator or a digital detonator.

[0057] It should be noted that the detonator as the initiation source of the main charge bag 22 selects the detonating tube detonator or the digital detonator, both of which have the characteristics of simple operation and high safety. The detonating tube detonator transmits the detonation signal through the detonating tube, has strong anti-static and anti-stray current ability, the digital detonator can accurately control the delay time, and adapts to complex initiation network. Both kinds of detonators do not need to rely on detonating cord, directly initiate explosive, and meet the design concept of no detonating cord structure.

[0058] Through the above steps, the intermediate link of using the detonator to detonate the detonating cord is avoided, the energy loss and misfire risk are reduced, the type of the detonator is flexibly selected, different construction environments (such as anti-explosion digital detonator for high-gas mine) are adapted, and whether the detonating tube detonator or the digital detonator is selected, both are simple to operate, the skill requirement for the construction personnel is reduced, and the charging efficiency is improved.

[0059] In an embodiment of the present application, a hole bottom reverse initiation mode is adopted, the main charge bag 22 is arranged at a position close to the hole bottom, and the rear end fired charge bag 21 is located at the hole bottom.

[0060] It should be noted that the hole bottom reverse initiation, that is, the detonator initiation point is located at the bottom of the charge bag, and the detonation wave propagates from the hole bottom to the hole opening. During construction, the rear end fired charge bag 21 (2 sections of charge) is first placed at the hole bottom, and then the main charge bag 22 with the detonator is pushed near the hole bottom, so that the main charge bag 22 first triggers the rear end fired charge bag 21 after detonation, and then triggers the front end fired charge bag 23 through sympathetic detonation. This way can make the explosive energy gradually release from the hole bottom to the hole opening, reducing the impact damage of the surrounding rock at the hole opening.

[0061] It needs to be explained again that the specific construction steps of the hole bottom reverse initiation mode are: 2 rolls of primed explosive rolls are filled at the hole bottom, then the detonating explosive roll with a detonator is completely pushed into the hole bottom, and then 53cm is pulled out, if the total amount of explosive is 5 rolls of explosive, then 63cm is pulled out and then one roll of explosive is added, and finally one roll of front-end primed explosive bag 23 is sent into the hole by 53cm or 63cm. The plugging structure 13, i.e. the wet paper shell 131 and the plastic film 132, is used to plug the blast hole, the wet paper shell 131 is introduced into the blast hole through the tamping rod, and the plastic film 132 is used to completely plug the blast hole, so that the sealing effect is achieved.

[0062] In the above manner, the propagation direction of the detonation wave is consistent with the direction of the rock resistance line, the energy utilization is more sufficient, the blasting efficiency is improved, the hole bottom is initiated first to avoid gas leakage caused by premature detonation of the hole mouth explosive, enhance the crushing effect of the rock at the hole bottom, reduce the vibration and damage of the surrounding rock at the hole mouth, protect the integrity of the boundary, and form a flat blasting surface.

[0063] In an embodiment of the present application, the blast hole 1 includes a peripheral hole 11 and an auxiliary hole 12, the three-section explosive bag structure 2 is arranged in the peripheral hole 11, and the peripheral hole 11 is located at the left wall and the vault position of the underground engineering, and the auxiliary hole 12 is arranged at the right wall position of the underground engineering.

[0064] It needs to be explained that the peripheral hole 11 is used to control the contour boundary of the underground engineering, and the blasting precision is high, so the three-section non-detonating cord structure is used to achieve smooth blasting effect through sympathetic detonation. The right wall needs to be expanded (the cross section is enlarged), and the blasting energy requirement is higher, so the auxiliary hole 12 is used for charging (conventional continuous charging or dense interval charging) to enhance the rock breaking capacity. The peripheral hole 11 at the left wall and the vault is marked and constructed separately to ensure the accuracy of the charging position.

[0065] In the above manner, the peripheral hole 11 and the auxiliary hole 12 are designed differently, the boundary forming precision and the expansion breaking effect are considered, the three-section structure is used for the left wall and the vault to reduce the disturbance to the surrounding rock and ensure the stability of the engineering, the blast hole type is set in zones, the construction process is optimized, and the pertinence and efficiency are improved.

[0066] In an embodiment of the present application, the blast hole 1 is further provided with a plugging structure 13, the plugging structure 13 includes a wet paper shell 131 and a plastic film 132 arranged in sequence from the hole bottom to the hole mouth, and the plastic film 132 is used to plug the blast hole.

[0067] It should be noted that the plugging structure 13 is the key to ensure that the blasting energy does not leak, the wet paper shell 131 has a certain strength and plasticity, and after being pushed into the hole by the tamping rod, it tightly fills the gap between the cartridge and the hole wall, prevents the detonation gas from escaping too early, and the plastic film 132 (such as a plastic bag) completely blocks the muzzle, further enhances the sealing performance, and at the same time prevents foreign matters outside the hole from entering. The plugging material is low in cost, easy to obtain, and will not affect the propagation of the explosive.

[0068] In the foregoing manner, the sealing performance of the blast hole is enhanced, it is ensured that the explosive energy is concentrated on the rock, the blasting efficiency is improved, the safety hazards such as flying stones and noise caused by the leakage of detonation gas are reduced, the construction safety is improved, the plugging material is simple and easy to obtain, the construction cost is reduced, and the operation is convenient.

[0069] In an embodiment of the present application, an initiation system 3 cooperating with the blast hole 1 is further included, the initiation system 3 adopts a one-time segmented delay initiation method, the peripheral hole 11 corresponding to the smooth blasting hole is set as 21-22 segments, and the main blast hole is set as 1-20 segments, and the delay time of the peripheral hole 11 and the main blast hole is 110 ms.

[0070] It should be noted that the one-time segmented delay initiation method controls the initiation sequence of different blast holes 1 through a millisecond delay detonator, the main blast hole (1-20 segments) is initiated first, the main rock mass is broken, and a free surface is created for the peripheral hole, the peripheral hole 11 (21-22 segments) is initiated with a delay of 110 ms, the free surface formed by the main blast hole is used to reduce the resistance of the rock, and smooth blasting is realized. The setting of the delay time is based on the stress release law after the rock is broken, and the stability of the surrounding rock when the peripheral hole is blasted is ensured.

[0071] In the foregoing manner, the segmented delay initiation is adopted to reduce the mutual interference between different blast holes 1, the surrounding rock damage caused by the superposition of seismic waves is avoided, the peripheral hole 11 is initiated with a delay, the free surface created by the main blast hole is used to improve the smooth blasting effect, the boundary is flat and crack-free, the process interval is reduced through one-time initiation, the construction efficiency is improved, and the safety risk of multiple initiation is reduced. In an embodiment of the present application, the diameter of the cartridge is 32 mm.

[0072] It can be understood that the cartridge diameter of 32 mm is designed according to the conventional aperture of the peripheral hole 11 (usually slightly smaller than the diameter of the blast hole 1), a certain gap is ensured between the cartridge and the hole wall, the cartridge is conveniently pushed to the predetermined position, the gap can be used as a buffer space for the detonation gas, and the propagation transmission efficiency is enhanced. The length of the cartridge with a diameter of 32 mm is moderate, which matches the interval distance of 53-63 cm, and the interval precision between the cartridges is convenient to control.

[0073] Through the size matching of the cartridge and the blast hole 1, the charging resistance is reduced, the construction efficiency is improved, the reasonable gap enhances the propagation effect, it is ensured that the cartridge is reliably initiated, the standardized size is convenient for batch production and on-site management, and the operation error is reduced.

[0074] In one embodiment of the present application, the number of blast holes 1 is 11, and each blast hole 1 is marked on the surrounding rock.

[0075] It should be noted that 11 peripheral holes 11 are selected as test holes, which are moderate in number, can cover typical positions of the left wall and the vault, are convenient for statistical analysis of blasting effect, the peripheral rock of the blast hole 1 is marked with paint, the hole position can be accurately positioned, the position of the cartridge pushing is confirmed during charging, and the effect parameters such as blast hole 1 traces and blasting boundary after blasting are observed, which provides a basis for subsequent optimization.

[0076] The above-mentioned design of 11 test holes takes into account representativeness and economy, is convenient for verifying technical feasibility, ensures accurate charging position, reduces operation error, improves blasting effect stability, is convenient for post-blasting effect tracking and data collection, provides reference experience for similar projects, and accelerates technology popularization.

[0077] The beneficial effects of the three-section smooth blasting charging structure without detonating cord of the present application are as follows:

[0078] The present application provides a three-section smooth blasting charging structure without detonating cord, compared with the traditional charging method using detonating cord, the new charging method cancels the use of detonating cord, greatly reduces the material cost and improves the work efficiency. The post-blasting boundary surrounding rock remains stable, no serious damage phenomenon occurs, and no blasting cracks occur on the hole wall, forming a smooth and beautiful boundary without root.

[0079] The present application provides a three-section smooth blasting charging structure without detonating cord, and proposes a new charging structure based on the principle of sympathetic detonation, that is, to cancel the detonating cord and bamboo chips, and to directly initiate the explosive through the detonating tube detonator, to realize the sequential initiation of the cartridges in the peripheral holes by using the characteristics of explosive sympathetic detonation. This structure can simplify the construction process, reduce the material cost, and reduce the safety problems caused by detonating cord.

[0080] The present application provides a three-section smooth blasting charging structure without detonating cord, which initiates explosive through sympathetic detonation and cancels the charging structure of long-term use of detonating cord in underground mines. After the test cancels the detonating cord, the charging structure is simplified, manpower and time are saved, there is no risk of cutting the detonating cord, the implementation is simple, and the effect is good.

[0081] The present application provides a three-section smooth blasting charging structure without detonating cord, which is simple in structure, easy to master, simple to implement, can be adjusted according to the on-site drilling conditions, and ensures the blasting effect.

[0082] The above description merely illustrates the preferred embodiment of this application and is not intended to limit the scope of the application, which is defined solely by the appended claims. Those skilled in the art will readily appreciate that other embodiments can be used without departing from the spirit and scope of the present application. Accordingly, the application is not to be restricted except in the spirit and scope of the appended claims.

[0083] Furthermore, while operations are depicted in a particular, chronological sequence in this disclosure, this should not be understood as requiring such order unless specifically specified. In some cases, for example, multiple operations can be performed at the same time. Similarly, while several specific implementation details are discussed in the above context, these should not be construed as limiting the scope of the application. Certain features described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although specific implementation details are discussed, these should not be construed as limiting the scope of the application, but merely as illustrating typical implementations.

[0084] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

[0085] Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the application. Accordingly, the patent is not limited except in the spirit and scope of the appended claims.

Claims

1. A three-stage smooth blasting charge structure without detonating cord, characterized in that: include: A blast hole (1), and a three-section charge structure (2) arranged in the blast hole (1); The three-stage charge structure (2) comprises a rear-end charge (21), a main charge (22) and a front-end charge (23) which are sequentially arranged at intervals; a detonator is provided in the main charge (22); the interval between the rear-end charge (21) and the main charge (22) is 53 to 63 cm, and the interval between the main charge (22) and the front-end charge (23) is 53 to 63 cm; no detonating cord is provided in the three-stage charge structure (2); the main charge (22) detonates the rear-end charge (21) and the front-end charge (23) sequentially by the principle of sympathetic detonation.

2. The three-stage smooth blasting charge structure without detonating cord according to claim 1 is characterized in that: The rear-end medicine package (21) includes two sections of medicine rolls, the main medicine package (22) includes 1 to 2 sections of medicine rolls, and the front-end medicine package (23) includes one section of medicine roll.

3. The three-stage smooth blasting charge structure without detonating cord according to claim 1 is characterized in that: When the main medicine bag (22) is arranged close to the bottom side, the main medicine bag (22) includes two sections of medicine rolls.

4. The three-stage smooth blasting charge structure without detonating cord according to claim 1 is characterized in that: The detonator is a nonel detonator or a digital detonator.

5. The three-stage smooth blasting charge structure without detonating cord according to claim 1 is characterized in that: A reverse detonation method at the bottom of the hole is adopted, wherein the main explosive package (22) is arranged near the bottom of the hole, and the rear-end explosive package (21) is located at the bottom of the hole.

6. The three-stage smooth blasting charge structure without detonating cord according to claim 1 is characterized in that: The blast hole (1) includes a peripheral hole (11) and an auxiliary hole (12), the three-stage powder bag structure (2) is arranged in the peripheral hole (11), the peripheral hole (11) is located at the left wall and arch position of the underground project, and the auxiliary hole (12) is arranged at the right wall position of the underground project.

7. The three-stage smooth blasting charge structure without detonating cord according to claim 1 is characterized in that: A blocking structure (13) is also provided in the blast hole (1). The blocking structure (13) comprises a wet paper shell (131) and a plastic film (132) arranged in sequence from the bottom of the hole to the hole mouth. The plastic film (132) is used to block the blast hole.

8. The three-stage smooth blasting charge structure without detonating cord according to claim 6 is characterized in that: The invention also includes an initiation system (3) coordinated with the blast hole (1), wherein the initiation system (3) adopts a one-stage delayed initiation method, wherein the peripheral holes (11) corresponding to the smooth blast hole are set to 21 to 22 sections, and the main blast hole is set to 1 to 20 sections, and the delay time between the peripheral holes (11) and the main blast hole is 110ms.

9. The three-stage smooth blasting charge structure without detonating cord according to claim 2, characterized in that: The diameter of the medicine roll is 32 mm.

10. The three-stage smooth blasting charge structure without detonating cord according to claim 1, characterized in that: The number of the blast holes (1) is 11, and a mark is provided on the rock surrounding each blast hole (1).

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