A blasting method of a boundary control blasting device for underground caverns

Abstract

The application discloses a kind of underground cavern controlled boundary blasting device's blasting method, the blasting device includes several blasting units, the blasting unit includes connecting rod and the upper unit and lower unit respectively connected with the both ends of connecting rod, the upper unit and lower unit all include fixed frame, two through holes are equipped on the fixed frame, and shaped charge is placed in the through hole, and guiding device is placed in the end of fixed frame.The underground cavern controlled boundary blasting device's blasting method of the application, by the metal jet of shaped charge emission, produce several holes, the power generated by explosion will be divided into the object to be blasted, since the metal jet of shaped charge emission, the amount of blasting is greatly reduced.

Description

Technical Field

[0001] This invention relates to a blasting method for a boundary control blasting device for underground caverns, belonging to the field of blasting. Background Technology

[0002] In underground cavern excavation, strict control of the excavation boundary is often required. Over-excavation or under-excavation will increase the amount of repair work later, leading to increased costs and construction time. Currently, the more mature boundary control blasting methods are smooth blasting and pre-splitting blasting. When implementing smooth blasting and pre-splitting blasting, all boreholes must be detonated simultaneously, resulting in a large total charge and thus significant blasting vibrations. At the same time, because the energy generated by the explosive is uniformly applied to the borehole wall along the circumference, while the boreholes are cut along the line connecting them, the remaining portion is also significantly damaged. This is disadvantageous in projects where the integrity of the remaining rock portion must be preserved. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a blasting method for a blasting device for controlling the boundary of underground caverns. By using a shaped charge to shoot out a metal jet, several holes are created. The explosive force divides the object to be blasted. Because the shaped charge shoots out a metal jet, the amount of explosive produced by the blast is greatly reduced.

[0004] Technical solution: To solve the above-mentioned technical problems, a blasting method for a boundary control blasting device for underground caverns includes the following steps:

[0005] (1) Drill blasting holes at certain intervals along the predetermined boundary using a drilling device, and open grooves on both sides of the blasting holes, with the groove depth being consistent with that of the blasting holes;

[0006] (2) Select the number of blasting units according to the depth of the borehole, so that the difference between the depth of the borehole and the total length of the blasting units is no greater than the length of one blasting unit, and assemble them together, and connect all the shaped charge charges in series with one detonating cord.

[0007] (3) Place the assembled blasting units into each borehole in sequence, with the axis of the shaped charge aligned with the direction of the groove;

[0008] (4) One detonator is installed at the end of the detonating cord of each blast hole, and the detonators of all blast holes are connected in series or in parallel;

[0009] (5) All blast holes are detonated simultaneously to cut the rock according to the predetermined boundary.

[0010] In this invention, the blasting unit includes a connecting rod and an upper unit and a lower unit respectively connected to both ends of the connecting rod. The upper unit and the lower unit each include a fixing frame. The fixing frame is provided with two through holes, in which a shaped charge is placed. A guide device is placed at the end of the fixing frame.

[0011] Preferably, the guiding device includes a cylinder and guide rods, the cylinder is connected to a fixed frame, the guide rods are inserted into the cylinder wall, and the guide rods are evenly distributed along the cylinder.

[0012] Preferably, a sleeve is installed at one end of the fixing frame, and the sleeve is fitted onto the connecting rod.

[0013] Preferably, the sleeve is provided with a locking device to fix the sleeve to the connecting rod.

[0014] Preferably, the connecting rod has a ring of graduations and the sleeve has a zero graduation.

[0015] Preferably, the shaped charge is fixed in the through hole with adhesive.

[0016] Preferably, the fixing frame includes a first body and a second body, both ends of which are provided with connecting plates. The first body and the second body are connected by the connecting plates. A cylinder is fixedly installed on the connecting plates on the outer side of the first body and the second body. A guide device is located on the cylinder. A connecting rod is inserted into the cylinder. The cylinders on both sides are coaxially arranged.

[0017] Beneficial Effects: The blasting method of the underground cavern boundary control blasting device of the present invention uses a shaped charge to inject a metal jet, which pre-generates several initial cracks in a predetermined cutting direction. Under the action of subsequent blast shock waves and explosive gases, the initial cracks expand and penetrate, achieving rock segmentation according to a predetermined boundary. Because the initial cracks generated on the borehole wall by the shaped charge's metal jet cause stress concentration at the initial crack locations, the rock can achieve crack penetration with relatively small blast energy, thereby improving the utilization rate of explosive energy and reducing the amount of explosive used in blasting. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of a structure consisting of two blasting units connected in series.

[0020] Figure 3 This is a front view diagram of the invention after installation.

[0021] Figure 4 for Figure 3 A top-down view. Detailed Implementation

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] like Figures 1 to 4As shown, an underground cavern boundary control blasting device of the present invention includes several blasting units 6. Each blasting unit 6 includes a connecting rod 3 and an upper unit and a lower unit respectively connected to both ends of the connecting rod 3. Both the upper unit and the lower unit include a fixing frame 2. The fixing frame 2 is provided with two through holes, and a shaped charge 5 is placed in the through holes. A guide device 1 is placed at the end of the fixing frame 2.

[0024] In this invention, the guiding device 1 includes a cylinder and a guide rod. The cylinder is connected to the fixing frame 2, and the guide rod is inserted into the cylinder wall and evenly distributed along the cylinder. A sleeve is installed at one end of the fixing frame 2, and the sleeve is fitted onto the connecting rod 3. The sleeve is provided with a locking device, which fixes the sleeve to the connecting rod 3. The connecting rod 3 has a graduation ring, and the sleeve has a zero graduation. The shaped charge 5 is fixed in the through hole with glue. The fixing frame 2 includes a first body and a second body. Both ends of the first body and the second body are provided with connecting plates, and the first body and the second body are connected by the connecting plates. A cylinder is fixedly installed on the connecting plates on the outer sides of the first body and the second body. The guiding device 1 is located on the cylinder, and the connecting rod 3 is inserted into the cylinder. The two cylinders on both sides are coaxially arranged.

[0025] In this invention, to ensure that the boundary control blasting device is centered in the borehole 7 when installed, guide devices 1 are fitted at both ends of the boundary control blasting device. All the shaped charge 5 inside the boundary control blasting device are connected by a detonating cord 4 and extend outside the borehole 7. When the borehole 7 is deep, multiple basic units can be connected to form a longer boundary control blasting device.

[0026] In actual engineering, blasting devices are used in large quantities. The connecting rod 3, fixing frame 2, and guiding device 1 in the blasting device can all be made of injection-molded plastic parts, and are bonded together with special adhesive. The shaped charge 5 can be an emulsion explosive with a plastic shell. The shell is made of injection-molded plastic parts, and the emulsion explosive is filled at the blasting site.

[0027] Before formal implementation, two basic parameters need to be determined: the length of the basic blasting unit 6 and the distance between blast holes 7. Since the rock properties vary in different projects, these parameters can be determined experimentally or adjusted during construction to fully demonstrate the advantages of this device.

[0028] After the basic parameters are determined, drilling is carried out at the required distance of the boreholes 7, with the depth determined according to the cutting requirements. After drilling, two grooves 8 are machined on the wall of the borehole 7 in the predetermined cutting direction, with the length of the grooves 8 consistent with the hole depth. The length of the connecting rod 3 in the blasting device is determined according to the length of the basic unit, and then the appropriate number of basic units is selected according to the depth of the borehole 7 to manufacture the boundary control blasting device, which is then placed in each borehole 7.

[0029] Connect the detonating cords 4 of each borehole 7 together and connect them to the detonator to detonate the shaped charge 5 in each borehole 7, thus completing the rock cutting.

[0030] A blasting method for a boundary control blasting device for underground caverns includes the following steps:

[0031] (1) Drill blast holes 7 at certain intervals along the predetermined boundary using a drilling device, and open grooves 8 on both sides of the blast holes 7, with the depth of the grooves 8 being the same as that of the blast holes 7.

[0032] (2) Based on the depth of the borehole 7, select the number of blasting units 6 so that the difference between the depth of the borehole 7 and the total length of the blasting units 6 is no greater than the length of one blasting unit 6, and assemble them together, and connect all the shaped charge 5 in series with one detonating cord 4.

[0033] (3) Place the assembled blasting unit 6 into each borehole 7 in sequence, with the axial direction of the shaped charge 5 aligned with the direction of the groove 8;

[0034] (4) A detonator is installed at the end of the detonating cord 4 of each blast hole 7, and the detonators of all blast holes 7 are connected in series or in parallel;

[0035] (5) All blast holes 7 are detonated simultaneously, so that the rock is cut open according to the predetermined boundary.

[0036] Using the above method, the boundary formed by rock cutting deviates little from the predetermined boundary, which helps to reduce over-excavation and under-excavation; the amount of explosives used is reduced, resulting in less blasting vibration; and the blast energy is mainly used in the direction of the predetermined boundary, causing less damage to the rock in other directions near the boundary.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A blasting method for a boundary control blasting device for underground caverns, characterized in that, Includes the following steps: (1) Drill blasting holes at certain intervals along the predetermined boundary using a drilling device, and open grooves on both sides of the blasting holes, with the groove depth being consistent with that of the blasting holes; (2) Select the number of blasting units according to the depth of the borehole, so that the difference between the depth of the borehole and the total length of the blasting units is no greater than the length of one blasting unit, and assemble them together, and connect all the shaped charge charges in series with one detonating cord. The blasting unit includes a connecting rod and an upper unit and a lower unit connected to both ends of the connecting rod, respectively. Both the upper unit and the lower unit include a fixing frame. The fixing frame has two through holes in which a shaped charge is placed. A guide device is placed at the end of the fixing frame. The fixing frame includes a first body and a second body. Both ends of the first body and the second body are provided with connecting plates. The first body and the second body are connected by the connecting plates. A cylinder is fixedly installed on the connecting plates on the outside of the first body and the second body. The connecting rod is inserted into the cylinder. The cylinders on both sides are coaxially arranged. (3) Place the assembled blasting units into each borehole in sequence, with the axis of the shaped charge aligned with the direction of the groove; (4) One detonator is installed at the end of the detonating cord of each blast hole, and the detonators of all blast holes are connected in series or in parallel; (5) All blast holes are detonated simultaneously to cut the rock according to the predetermined boundary.

2. The blasting method of the underground cavern boundary control blasting device according to claim 1, characterized in that: The guide The device includes a cylinder and a guide rod. The cylinder is connected to a fixed frame, and the guide rod is inserted into the wall of the cylinder. The guide rod moves along... The cylinders are evenly distributed.

3. The blasting method of the underground cavern boundary control blasting device according to claim 1, characterized in that: The solid A sleeve is installed at one end of the fixed frame, and the sleeve is fitted onto the connecting rod.

4. The blasting method of the underground cavern boundary control blasting device according to claim 3, characterized in that: The set The sleeve is equipped with a locking device, which is used to fix the sleeve to the connecting rod.

5. The blasting method of the underground cavern boundary control blasting device according to claim 4, characterized in that: The connection The connecting rod has a ring of graduations, and the sleeve has a zero mark.

6. The blasting method of the underground cavern boundary control blasting device according to claim 1, characterized in that: The aggregation The explosive charge can be fixed in the through hole with glue.

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