CN212227892U

CN212227892U - Tunnel blasting system

Info

Publication number: CN212227892U
Application number: CN202020739278.1U
Authority: CN
Inventors: 刘占辉; 佘红雨; 叶昊
Original assignee: CCCC First Highway Engineering Co Ltd
Current assignee: CCCC First Highway Engineering Co Ltd
Priority date: 2020-05-07
Filing date: 2020-05-07
Publication date: 2020-12-25
Anticipated expiration: 2030-05-07

Abstract

The utility model discloses a tunnel blasting system, which comprises an energy collecting pipe and an explosion wire; each peripheral hole of the tunnel is provided with an explosive which is positioned in the energy gathering pipe; the detonating cord comprises a first detonating cord, a second detonating cord and a third detonating cord, the first detonating cord winds the curved surface from the bottom of one end of the tunnel section to the bottom of the other end of the tunnel section and passes through each peripheral hole, and the end part of the first detonating cord is connected with the initiator; each energy gathering pipe is connected with a second detonating cord, and each second detonating cord is connected with the first detonating cord; each second detonating cord is connected with the bottom end of a third detonating cord, and the top end of each third detonating cord is connected with the first detonating cord. The explosive in the blast hole is easier to detonate, the probability of blind guns is greatly reduced, only one detonating cord is added at each energy gathering tube, the number of blast holes is not increased, the cost is low, the detonation interval time is not influenced, and the blasting effect is ensured.

Description

Tunnel blasting system

Technical Field

The utility model belongs to the tunnel blasting field relates to a tunnel blasting system.

Background

At present, the drilling and blasting method is generally adopted for tunneling in tunnels in China, and the drilling and blasting method is simple, convenient, flexible and suitable for underground caverns of various shapes, sizes and sizes, but the drilling and blasting method cannot overcome the problems of blind blasting and detonation time sequence, high manufacturing cost of detonators, complex explosive loading device and incapability of well controlling explosive spacing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a tunnel blasting system, effectively avoid the blind big gun, guaranteed the interval time of detonating.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

a tunnel blasting system comprises an energy gathering pipe and a detonating cord;

each peripheral hole of the tunnel is provided with an explosive which is positioned in the energy gathering pipe;

the detonating cord comprises a first detonating cord, a second detonating cord and a third detonating cord, the first detonating cord winds the curved surface from the bottom of one end of the tunnel section to the bottom of the other end of the tunnel section and passes through each peripheral hole, and the end part of the first detonating cord is connected with the initiator; each energy gathering pipe is connected with a second detonating cord, and each second detonating cord is connected with the first detonating cord; each second detonating cord is connected with the bottom end of a third detonating cord, and the top end of each third detonating cord is connected with the first detonating cord.

Preferably, the energy collecting pipes in the two holes at the bottom ends of the peripheral holes are connected with detonators, and both ends of the first detonating cord are connected with the exploder.

Furthermore, the front ends of the energy-collecting pipes in the two holes at the bottom ends of the peripheral holes are connected with stemming, the stemming is connected with a detonator pin and a second detonating cord, and the detonator is connected with an explosive at the tail end of the energy-collecting pipe.

Preferably, a triangular groove is formed in the peripheral surface of the energy collecting pipe, the triangular groove is parallel to the axis of the energy collecting pipe, the length of the triangular groove is equal to that of the energy collecting pipe, and the second detonating cord enters from the front end, located at the energy collecting pipe, of the triangular groove and extends into the tail end, located at the energy collecting pipe, of the triangular groove.

Preferably, the inner wall surface of the energy collecting pipe is of a concave-convex structure.

Preferably, the first detonating cord, the second detonating cord and the third detonating cord are connected by binding.

Further, the binding length among the first detonating cord, the second detonating cord and the third detonating cord is more than or equal to 15 cm.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a three detonating cords interconnect, and one of them connects the detonator, can detonate through two remaining detonating cords, and detonating cord both-way conduction is to the explosive, makes the explosive in the big gun hole detonate more easily, and the probability of the blind big gun that significantly reduces to only increase a detonating cord in every energy collecting pipe department, need not increase big gun hole quantity, the cost is lower, and can not influence the interval time that detonates, guarantees the effect of blasting.

Furthermore, two detonators at the bottommost end of the side hole are detonated, and two-way detonation conduction is achieved, so that simultaneous detonation of the peripheral holes can be guaranteed, the detonators are saved, construction cost is reduced, and the blasting effect is improved.

Furthermore, the triangular groove of the energy-gathering pipe can gather the energy of the detonating cord to spread to the explosive, and the blasting effect is better.

Furthermore, the concave-convex structure of the inner wall of the energy-collecting pipe greatly increases the friction force of the inner wall, prevents the explosive from sliding, can better ensure the accuracy of spaced charging and greatly exerts the effect of the explosive.

Drawings

Fig. 1 is a schematic view of the blasting system of the present invention;

FIG. 2 is a schematic view of the explosion wire connection of the present invention;

fig. 3 is a schematic view of the energy concentrating tube structure of the present invention;

FIG. 4 is a cross-sectional structure view of the energy collecting tube of the present invention;

fig. 5 is a schematic cross-sectional view of an energy concentrating tube according to the present invention;

FIG. 6 is a schematic view of the shaped charge of the present invention;

fig. 7 is a schematic view of the structure of the peripheral eye bottom energy collecting tube of the present invention.

Wherein: 1-peripheral eye; 2-a first detonating cord; 3-a second detonating cord; 4-a third detonating cord; 5-an explosive; 6-energy gathering pipe; 7-a detonator; 8-detonator leg wire; 9-stemming; 10-triangular groove.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings:

referring to fig. 1, the blasting system of the present invention is shown.

The peripheral holes 1 are blast holes arranged around the roadway and close to the rock wall, and the function of the blast holes is to form the cross section shape of the roadway. Each peripheral hole 1 of the tunnel is provided with an explosive 5, and the explosive 5 is positioned in the energy gathering pipe 6.

The diameter of the detonating cord is 6 mm, the propagation speed is 8000 m/s, as shown in fig. 2, the detonating cord comprises a first detonating cord 2, a second detonating cord 3 and a third detonating cord 4, the first detonating cord 2 is a main line, and the third detonating cord 4 is a small section of connecting line with the main line and the blast hole lead. The first detonating cord 2 winds the curved surface from the bottom of one end of the tunnel section to the bottom of the other end and passes through each peripheral hole 1, and both ends of the first detonating cord 2 are connected with an initiator; each energy collecting pipe 6 is connected with a second detonating cord 3, and each second detonating cord 3 is connected with the first detonating cord 2; each second detonating cord 3 is connected with the bottom end of a third detonating cord 4, the top end of each third detonating cord 4 is connected with the first detonating cord 2, and the included angle of each detonating cord after connection is smaller than 90 degrees.

The first detonating cord 2, the second detonating cord 3 and the third detonating cord 4 are connected by adopting binding, and the binding length is more than or equal to 15 cm.

As shown in fig. 3, the energy collecting pipe 6 is 3 meters in length, 1 millimeter in thickness and 36 millimeters in inner diameter, the angle between the upper opening and the lower opening and two connecting lines of the circle center is 110 degrees, as shown in fig. 4 and 5, a triangular groove 10 is arranged on the peripheral surface of the energy collecting pipe 6, the triangular groove 10 is parallel to the axis of the energy collecting pipe 6, the length of the triangular groove 10 is the same as that of the energy collecting pipe 6, the distance between the opening at the top end of the triangular groove 10 is 5.2 millimeters, the included angle between the opening at the cross section and two connecting lines of the circle center of the second detonating cord 3 is 120 degrees, and the second detonating cord 3 enters from the front end of the energy collecting pipe 6 positioned in.

The length of the opening of the energy-gathering pipe 6 is slightly less than the length of a string at the opening position of the explosive 5 which completely enters the energy-gathering pipe 6, and the explosive 5 is prevented from sliding by utilizing the biting force at the opening of the energy-gathering pipe 6, so that the detonating cord is tightly attached to the explosive 5. The inner wall surface of the energy-gathering pipe 6 is of a concave-convex structure, and the effect of increasing friction force can be achieved.

As shown in fig. 6, a first roll of explosives 5 is loaded at the tail end of an energy-gathering tube 6, each roll of explosives 5 is 30 cm in length and 32 mm in diameter, then a plurality of rolls of explosives 5 are divided into two halves, each small section of explosives 5 are placed at the corresponding position of the energy-gathering tube 6, the interval between the explosives 5 is 30 cm, the energy-gathering tube 6 loaded with the explosives 5 is positioned at the bottom of a blast hole, finally, a blast hole opening is blocked by using stemming 9, and the length of the stemming 9 is 70 cm.

As shown in fig. 7, the front ends of the energy-gathering tubes 6 in the two holes at the bottom ends of the peripheral holes 1 are connected with stemming 9, the stemming 9 is connected with a detonator pin 8 and a second detonating cord 3, and a detonator 7 is connected with an explosive 5 at the tail end of the energy-gathering tube 6.

Before blasting peripheral holes 1 of a tunnel, firstly putting energy-collecting pipes 6 filled with explosives 5 into each peripheral hole 1, connecting each energy-collecting pipe 6 with a second detonating cord 3, connecting each second detonating cord 3 with a first detonating cord 2, connecting each second detonating cord 3 with the bottom end of a third detonating cord 4, connecting the top end of each third detonating cord 4 with a first detonating cord 2, and connecting two ends of each first detonating cord 2 with an exploder; when the blasting of the peripheral holes 1 is carried out in the tunnel, the initiators at the two ends of the first detonating cord 2 are started simultaneously, and the blasting starts from the bottoms at the two ends of the peripheral holes 1 and converges towards the peripheral hole 1 at the top in sequence until the blasting of all the peripheral holes 1 is finished.

The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims

1. A tunnel blasting system, characterized by comprising a concentrator tube (6) and a detonating cord;

each peripheral hole (1) of the tunnel is provided with an explosive (5), and the explosive (5) is positioned in the energy-gathering pipe (6);

the detonating cord comprises a first detonating cord (2), a second detonating cord (3) and a third detonating cord (4), the first detonating cord (2) winds from the bottom of one end of the tunnel section to the bottom of the other end and passes through each peripheral hole (1), and the end part of the first detonating cord (2) is connected with the detonator; each energy gathering pipe (6) is connected with a second detonating cord (3), and each second detonating cord (3) is connected with the first detonating cord (2); each second detonating cord (3) is connected with the bottom end of a third detonating cord (4), and the top end of each third detonating cord (4) is connected with the first detonating cord (2).

2. The tunnel blasting system according to claim 1, wherein the energy-concentrating tubes (6) in the two holes at the bottom end of the peripheral hole (1) are connected with detonators (7), and the first detonating cord (2) is connected with an initiator at both ends.

3. The tunnel blasting system according to claim 2, wherein the front end of the energy-gathering tube (6) in the two holes at the bottom end of the peripheral hole (1) is connected with stemming (9), the stemming (9) is connected with a detonator pin (8) and a second detonating cord (3), and the detonator (7) is connected with the explosive (5) at the tail end of the energy-gathering tube (6).

4. The tunnel blasting system of claim 1, wherein the peripheral surface of the energy collecting pipe (6) is provided with a triangular groove (10), the triangular groove (10) is parallel to the axis of the energy collecting pipe (6), the length of the triangular groove (10) is the same as that of the energy collecting pipe (6), and the second detonating cord (3) enters from the front end of the energy collecting pipe (6) positioned in the triangular groove (10) and extends into the tail end of the energy collecting pipe (6) positioned in the triangular groove (10).

5. The tunnel blasting system according to claim 1, wherein the inner wall surface of the concentrator tube (6) is of a concave-convex structure.

6. The tunnel blasting system according to claim 1, wherein the first detonating cord (2), the second detonating cord (3) and the third detonating cord (4) are connected by binding.

7. The tunnel blasting system according to claim 6, wherein the binding length between the first detonating cord (2), the second detonating cord (3) and the third detonating cord (4) is 15cm or more.