CN117006910A - Coal mine underground deep hole top-release hole sealing process - Google Patents

Abstract

The invention discloses a coal mine underground deep hole top-down hole sealing process, which adopts a 'rigid-plastic-rigid' structure for hole sealing, wherein the length of quick cement is 2m, loess is required to be sealed according to a blast hole parameter table, the quick cement is 3m, a hole opening reserved section is 1.5m, and external reinforcement hole sealing is carried out from top to bottom in sequence; orifice reserved section plugging structure: the thickness of stemming is 1.5m to the thickness of the wooden wedge is 0.3m; external reinforcing plugging structure: flame-retardant adhesive tape, square timber, steel plate, supporting plate, nut and fastening; finally, loess is used for completely closing the reserved hole of the hole, and the electric detonator leg wire is led out of the hole so as to be convenient to connect with a blasting busbar. After the hole sealing process is used, the impact of blasting on hole sealing materials can be reduced; the blast hole blasting does not generate punching phenomenon; greatly improves the deep hole blasting effect.

Description

Coal mine underground deep hole top-release hole sealing process

The invention relates to a deep hole caving hole sealing process in a coal mine, and belongs to the field of coal mining.

At present, the hole sealing of the deep hole top caving adopted by the coal mine and the adjacent mine is of a plastic-rigid structure, namely, the hole sealing is adopted near the explosive section after the deep hole is drilled and charged, and the hole sealing is carried out near the 4m section of the hole opening by using quick cement. The blasthole plugged by the hole sealing structure is easy to cause a punching phenomenon during blasting, water is sprayed or permeated in the blasthole, and even when the water quantity is larger, once the hole sealing time is longer or the water quantity is large in short time supply in the hole, stemming becomes slurry, punching is easier to cause, equipment and facilities are damaged, the whole sectional roof cutting effect is influenced, and the concentrated leakage of CO gas in the hole is out of limit.

Document retrieval

(1) Patent application number: CN20201436046. X discloses a blasting hole sealing method. The method adopts the construction drilling in the object to be blasted; loading explosives and detonators into the borehole; loading flame retardant materials into the drill hole and compacting the explosive; loading the expandable hole packer into the borehole to bear the flame-retardant material; injecting high-pressure liquid into the expandable hole packer through a high-pressure pump communicated with the expandable hole packer, so that the expandable hole packer expands to press the inner wall of the drill hole, and closing the high-pressure pump and the liquid injection valve after the pressure of the expandable hole packer to the inner wall of the drill hole reaches the design pressure; connecting the blasting leg wire outside the drill hole with the initiator, and detonating the explosive in the drill hole; after blasting is completed, opening a liquid injection valve and a one-way water outlet valve of the high-pressure pump to discharge high-pressure liquid in the expandable hole packer, releasing the pressure of the expandable hole packer, separating the expandable hole packer from the inner wall of the drilled hole, and withdrawing the expandable hole packer to realize hole sealing operation;

(2) Patent application number: CN202010837721.3 discloses a new process for deep hole blasting and sealing, which comprises the following steps: firstly, a deep hole is formed in a construction site, and then explosive is filled in an explosive layer at two thirds of the deep hole; sleeving the grouting pipe on the rubber connecting sleeve through the conical connecting sleeve, and then installing the bag through a handle on the handheld bag locker; placing the bag into a hole sealing section at a deep hole, stirring and mixing hole sealing materials according to a water-cement ratio of 1:1, connecting a grouting pipe with a grouting pump, injecting the hole sealing materials into the bag along the grouting pipe and a grouting pipe through the grouting pump, so that the bag bulges and the hole sealing section is blocked, stopping grouting when the pressure gauge shows that the pressure is 2MP, and then solidifying the hole sealing materials in the bag 3 for 20min and then blasting; the invention solves the problem of punching; and has the function of centralizing the blasting energy; the method has the advantages of simplifying the construction flow of workers, shortening the construction time, being simple to operate, being safe and reliable, ensuring the strength of hole sealing materials, and being economical and applicable.

(3) Patent application number: CN202011082291.5 discloses a mining deep hole blasting hole sealing device, which relates to the technical field of mining deep hole blasting hole sealing, and comprises a grouting pipe and barb hooks fixed at the upper end of the grouting pipe, wherein the barb hooks comprise annular barbs distributed in preset quantity, the top of the grouting pipe is closed, the pipe body of the grouting pipe is sequentially wrapped with bags in preset quantity from top to bottom, each grouting pipe section in each bag is respectively provided with a grouting hole, each grouting hole except the uppermost grouting hole is respectively sleeved with an elastic sealing sleeve, the minimum pressure required by punching each elastic sealing sleeve from the grouting hole is sequentially increased from top to bottom, and the mining deep hole blasting hole sealing device is simple to operate, low in labor intensity of constructors, short in construction period and higher in working efficiency, avoids material waste.

The invention aims to provide a coal mine underground deep hole top-discharging hole sealing process which can prevent CO gas in holes from leaking out and exceeding the limit, and reduce the probability of CO exceeding caused by deep hole blasting when blast holes are punched.

The method comprises the following steps: a coal mine underground deep hole top-down hole sealing process,

1) Adopting a 'rigid-plastic-rigid' structure to seal holes, and simultaneously using a flame-retardant adhesive tape, a wood plate and a steel plate to seal the blast holes by a reinforced hole sealing process by matching with anchor rods;

2) Hole sealing structure: the method comprises the steps of sequentially filling the quick cement with the length of 2m, the loess according to the requirement of a blast hole parameter table, filling the quick cement with the length of 3m, reserving the hole opening with the length of 1.5m and filling the hole with external reinforcement;

3) Orifice reserved section plugging structure: the thickness of stemming is 1.5m to the thickness of the wooden wedge is 0.3m;

4) External reinforcing plugging structure: flame-retardant adhesive tape, square timber, steel plate, supporting plate, nut and fastening;

after charging, using a PVC pipe to push 2m quick cement into the hole and tamping;

sealing the shot mud into the hole by using a charge device according to the requirements of a shot hole parameter table;

pushing 3m quick cement into the hole and tamping the hole to reserve 1.5m by using a PVC pipe;

after the electric detonator is connected with the detonating cord, placing the electric detonator and the detonating cord in the hole, and conveying the electric detonator and the detonating cord to the terminal of the reserved hole of the hole by using a wooden gun stick;

finally, loess is used for completely closing the hole opening reserved holes, and the electric detonator leg wires are led out of the hole openings so as to be convenient to connect with the blasting bus;

5) Using a conical wooden wedge: the length is 300mm, one end phi is 100mm, one end of the wood wedge is turned into a cone shape, a 4mmU groove is turned on the edge of the wood wedge, so that a detonator stranded wire can be conveniently placed in a wedged hole, and the outer edge of the hole is level with the outer end of the wood wedge;

4 anchor rods are constructed at the orifice, and the length of each anchor rod is 1800mm;

leveling uneven positions of the orifice by cement;

4 flame-retardant adhesive tapes are additionally arranged at the orifice: size: 200mm×200mm×10mm, square 1 block: 250mm×250mm×40mm and steel plate: machining the size of the supporting plate: the four sides of the anchor rods are embedded into reserved holes on four sides of the supporting plate, and finally the supporting plate with the diameter of 100mm multiplied by 100mm and the nuts are used for fixing the iron supporting plate firmly.

After the hole sealing process is used, the impact of blasting on hole sealing materials can be reduced; the blast hole blasting does not generate punching phenomenon; the deep hole blasting effect is greatly improved; effectively prevent the CO gas in the holes from leaking out in a concentrated way to cause overrun. The hole sealing process is easy to operate, has good hole sealing effect, is suitable for coal face of a hard roof of a coal mine, which adopts advanced pre-splitting blasting deep hole roof caving, and has wide popularization prospect in the future.

Drawings

Fig. 1 is a schematic diagram of a hole sealing structure according to the present invention.

Description of the embodiments

A coal mine underground deep hole top-down hole sealing process,

1) Adopting a 'rigid-plastic-rigid' structure to seal holes, and simultaneously using a flame-retardant adhesive tape, a wood plate and a steel plate to seal the blast holes by a reinforced hole sealing process by matching with anchor rods;

2) Hole sealing structure: the method comprises the steps of sequentially filling a cartridge 1, a quick cement 2 with the length of 2m, loess according to a blast hole parameter table, filling the quick cement 6 with the length of 3m, reserving an orifice section of 1.5m and sealing the outside reinforcement hole from top to bottom;

3) Orifice reserved section plugging structure: the thickness of stemming is 1.5m to the thickness of the wooden wedge is 0.3m;

external reinforcing plugging structure: flame-retardant adhesive tape, square timber, steel plate, supporting plate, nut and fastening;

pushing 2m quick cement 2 into the hole by using a PVC pipe after charging and tamping;

according to the requirements of a blasthole parameter table, using a charge device to seal the stemming 3 into the hole;

pushing 3m quick cement 6 into the hole and tamping the hole to reserve 1.5m by using a PVC pipe;

after the electric detonator 7 is connected with the detonating cords 4 and 5, the electric detonator 7 and the detonating cords 4 and 5 are placed in the holes, the detonating cord 4 is a main detonating cord, and the detonating cord 5 is a secondary detonating cord. Using a wooden gun stick to send the electric detonator and the detonating cord to the terminal end of the orifice reserved hole;

loess is used for completely closing the reserved hole of the hole, and the electric detonator leg wire 9 is led out of the hole so as to be convenient to connect with a blasting busbar;

4) Conical wooden wedges 14 were used: the length is 300mm, one end phi is 100mm, one end of the wood wedge is turned into a cone shape, a 4mmU groove is turned on the edge of the wood wedge, so that a detonator stranded wire can be conveniently placed in a wedged hole, and the outer edge of the hole is level with the outer end of the wood wedge;

4 anchor rods 13 are constructed at the orifice, and the length of each anchor rod 13 is 1800mm;

leveling the uneven part of the orifice by using cement 8;

4 flame-retardant adhesive tapes 12 are added at the orifice: size: 200mm×200mm×10mm, square 1 block 11:250mm×250mm×40mm and steel sheet 10: machining the size of the supporting plate: the four anchor rods 13 are embedded into reserved holes on four sides of the supporting plate, and finally the iron supporting plate is fixed firmly by using the supporting plate with the diameter of 100mm multiplied by 100mm and nuts.

Claims (1)

1. A coal mine underground deep hole top-release hole sealing process is characterized in that:

1) Adopting a 'rigid-plastic-rigid' structure to seal holes, and simultaneously using a flame-retardant adhesive tape, a wood plate and a steel plate to seal the blast holes by a reinforced hole sealing process by matching with anchor rods;

2) Hole sealing structure: the method comprises the steps of sequentially filling the quick cement with the length of 2m, the loess according to the requirement of a blast hole parameter table, filling the quick cement with the length of 3m, reserving the hole opening with the length of 1.5m and filling the hole with external reinforcement;

3) Orifice reserved section plugging structure: 1.5m of stemming thickness, and 0.3m of wood chip thickness;

4) External reinforcing plugging structure: flame-retardant adhesive tape, square timber, steel plate, supporting plate, nut and fastening;

after charging, using a PVC pipe to push 2m quick cement into the hole and tamping;

sealing the shot mud into the hole by using a charge device according to the requirements of a shot hole parameter table;

pushing 3m quick cement into the hole and tamping the hole to reserve 1.5m by using a PVC pipe;

after the electric detonator is connected with the detonating cord, placing the electric detonator and the detonating cord in the hole, and conveying the electric detonator and the detonating cord to the terminal of the reserved hole of the hole by using a wooden gun stick;

finally, loess is used for completely closing the hole opening reserved holes, and the electric detonator leg wires are led out of the hole openings so as to be convenient to connect with the blasting bus;

using a conical wooden wedge: the length is 300mm, one end phi is 100mm, one end of the wood wedge is turned into a cone shape, a 4mmU groove is turned on the edge of the wood wedge, so that a detonator stranded wire can be conveniently placed in a wedged hole, and the outer edge of the hole is level with the outer end of the wood wedge;

4 anchor rods are constructed at the orifice, and the length of each anchor rod is 1800mm;

leveling uneven positions of the orifice by cement;

4 flame-retardant adhesive tapes are additionally arranged at the orifice: size: 200mm×200mm×10mm, square 1 block: 250mm×250mm×40mm and steel plate: machining the size of the supporting plate: the four sides of the anchor rods are embedded into reserved holes on four sides of the supporting plate, and finally the supporting plate with the diameter of 100mm multiplied by 100mm and the nuts are used for fixing the iron supporting plate firmly.