Smooth blasting charging device
By designing a glossy blasting charging device including hollow round tubes, dispersed and installed explosive rolls, brackets and detonators, the problems of excessive rock mass breaking and under-excavation caused by continuous charging of the bottom of the glossy blasting mesoporous bore are solved, and more efficient blasting effect and lower construction costs are achieved.
Patent Information
- Application Number
- CN202421429971.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the construction of gloss blasting, when the light blasting hole is continuously charged at the bottom of the hole, it will cause excessive crushing of the rock mass, excessive excavation of the hole bottom or under-excavation of the hole, and the lack of detonation cables affects construction efficiency and cost.
A glossy blasting charge device is designed, including a hollow circular tube, a dispersed explosive roll, a bracket and a detonator. The round tube is spaced in the length direction. The wall thickness of the round tube is thinned at the air separation section between the explosive rolls. The bracket is connected to the adjacent explosive rolls, and the detonator is inserted into one of the explosive rolls.
It realizes that without using the detonation cable, the axial uncoupled charge of air separation is realized, which reduces the pressure of the hole wall, reduces damage to the surrounding rock, avoids the problem of under-excavation of the orifices, and improves the gloss blasting effect and construction efficiency.
Smart Images
Figure CN222598667U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rock blasting, in particular to a smooth blasting charging device. Background Art
[0002] Traditional smooth blasting technology requires the use of an axially spaced charge structure in the blasthole, with a long distance of uncharged air between the explosive packs. In order to detonate all the spaced explosive packs, detonating cords are required to connect all the explosive packs in series. However, this method has complex construction procedures and difficult processing of explosive packs. At the same time, in recent years, due to safety and economic issues, many factories no longer produce detonating cords, making the purchase of detonating cords more difficult.
[0003] Therefore, in current actual projects, when smooth blasting is used, the smooth blasting hole usually adopts a continuous charging structure at the bottom of the hole. However, when continuous charging at the bottom of the hole is used in soft rock mass, the hole wall pressure generated by the explosion of explosives is high, resulting in excessive rock fragmentation and over-excavation of the bottom of the hole, or the surrounding hole opening rock mass is less affected by the explosion due to insufficient charging length, resulting in under-excavation of the hole mouth. The use of continuous charging at the bottom of the hole due to the lack of detonating cord will affect the smooth blasting effect, reduce the efficiency of each construction process, and increase the construction cost. Utility Model Content
[0004] The main purpose of the utility model is to solve the problems of large damage to the retained rock mass and uneven charging at the bottom of the smooth blasting hole in the existing smooth blasting construction, which leads to over-excavation at the bottom of the hole and under-excavation at the hole mouth, improve the smooth blasting effect, control over-excavation and under-excavation, and save construction costs.
[0005] In order to achieve the above objectives, the utility model provides a smooth blasting charging device, the charging device comprising:
[0006] A round tube is a hollow structure with one end closed;
[0007] Explosive cartridges are cylindrical in shape and are dispersedly installed in round tubes with a quantity of not less than 2;
[0008] The bracket has a length of not less than 20 cm and not more than 100 cm, and two ends of the bracket are respectively connected to two adjacent explosive rolls;
[0009] A detonator, inserted into one of the explosive charges.
[0010] The round tube is a polymer tube with an outer diameter smaller than the diameter of the blast hole and an inner diameter larger than the diameter of the cylindrical explosive roll, and a wall thickness of 1 to 4 mm.
[0011] The round tube is a polymer tube with an outer diameter smaller than the bore diameter and an inner diameter larger than the diameter of the explosive roll. Air interval sections are arranged at intervals along the length direction of the round tube. The wall thickness at the air interval section is 0.5-1mm, and the wall thickness of the round tube at the non-air interval section is 1-4mm.
[0012] The wall thickness of the round tube is 1-4 mm, and the outer side of the round tube is cut and thinned by 3-3.5 mm at the air gap section.
[0013] The explosive roll is an emulsion explosive with a diameter of not less than 32 mm, a length of 5 cm to 30 cm, and a density of 0.95 to 1.3 g / cm 3 , detonation velocity is greater than 3200m / s, and detonation distance is ≥3cm.
[0014] The two ends of the bracket are constructed as a hollow structure, and the proportion of the cross-sectional area of the bracket on the cross-sectional area of the circular tube to the cross-sectional area inside the circular tube is not greater than 10%.
[0015] The two ends of the bracket are detachably connected to the ends of the explosive roll.
[0016] Beneficial effects of the utility model:
[0017] (1) Compared with the standard smooth blasting technology which uses spaced charges and requires detonating cords for detonation, the utility model can achieve air-spaced axially uncoupled charges without using detonating cords.
[0018] (2) Compared with the non-standard smooth blasting technology that uses continuous and uninterrupted charging of explosive cartridges, the explosives in the utility model are more dispersed, the hole wall pressure is significantly reduced, and the damage to the surrounding rock can be greatly reduced.
[0019] (3) Compared with the general blasting charge directly installed in the blast hole, the utility model adds a tube shell with a certain thickness outside the general charge, thereby avoiding direct contact between the explosive and the blast hole wall, and further reducing the damage to the hole wall.
[0020] (4) Compared with the situation where explosive cartridges are non-continuously loaded into a circular tube of equal wall thickness and then installed in a blasthole, the utility model reduces the wall thickness of the circular tube in the air gap section between the explosive cartridges, thereby avoiding the problem that after the explosives are blasted, the blasting pressure in the air gap section is relatively low, and the blasting pressure is weakened by the circular tube of equal thickness, resulting in under-digging of the hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0022] Figure 1This is a schematic diagram of the structure of a smooth blasting charging device; 1 - blasthole wall, 2 - round tube, 3 - explosive, 4 - detonator; 5 - PVC bracket. DETAILED DESCRIPTION
[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.
[0024] refer to Figure 1 The figure is a schematic diagram of the structure of a smooth blasting charge device.
[0025] The diameter of the blasthole wall 1 is 50 mm and the length is 1.5 m.
[0026] The round tube 2 is a hollow PVC tube with a length of 1.5m, an outer diameter of 40mm, a wall thickness of 2mm, and an inner diameter of 36mm. The inside of the tube is smooth, and the opening at one end is blocked with a PVC cap;
[0027] Explosive roll 3 is a cylindrical emulsion explosive roll wrapped in film produced by the factory, with a diameter of 32mm, a length of 30cm, and an explosive density of 0.95-1.3g / cm 3 , detonation speed is greater than 3200m / s, and the detonation distance is ≥3cm;
[0028] One roll of explosives 3 is placed in the circular tube 2 at one end near the bottom of the hole, i.e. the sealed end, and the other two rolls of explosives 3 are arranged in the circular tube 2 at intervals of 40 cm;
[0029] The detonator 4 is inserted into an explosive cartridge 3, and its leg line extends from the circular tube 2 to the outside of the tube.
[0030] The PVC bracket 5, which is 50 cm long, is installed between two adjacent explosive rolls 3. The two ends of the bracket 5 are connected to the two explosive rolls 3 respectively, and the explosive roll is inserted into the end of the bracket by 5 cm.
[0031] The energy E generated when explosives explode is E = mV d 2 / 2,V d =3200m / s, m=ρV tube =1.125g / cm 3 ×76.8cm 3 =86.4 g, E = 442368 kg m 2 / s 2 The shock wave generated by the explosion will decay when propagating in the tube. The decay can be described by an empirical formula, such as P(r) = P 0 e -βr , where P(r) is the pressure at a distance r from the explosion point, P 0 is the initial pressure, and β is the attenuation coefficient. 0=2·E / (L charge πr 2 inner ), the explosion pressure of the explosive at the air interval section is attenuated. Thinning the wall thickness of the circular tube at the air interval section can reduce the attenuation effect of the circular tube on the explosion pressure, so that the blast holes outside the circular tube are subjected to uniform explosion pressure, avoiding under-digging of the blast holes outside the circular tube at the air interval section.
[0032] Compared with the existing technology, the utility model has the following advantages:
[0033] (1) Compared with the standard smooth blasting technology which uses spaced charge and requires detonating cord for detonation, the utility model can realize air-spaced axial uncoupled charge without using detonating cord.
[0034] (2) Compared with the non-standard smooth blasting technology that uses continuous and uninterrupted charging of explosive cartridges, the explosives in the utility model are more dispersed, the hole wall pressure is significantly reduced, and the damage to the surrounding rock can be greatly reduced.
[0035] (3) Compared with the general blasting charge directly installed in the blast hole, the utility model adds a tube shell with a certain thickness outside the general charge, thereby avoiding direct contact between the explosive and the blast hole wall, and further reducing the damage to the hole wall.
[0036] (4) Compared with the situation where explosive cartridges are non-continuously loaded into a circular tube of equal wall thickness and then installed in a blasthole, the utility model reduces the wall thickness of the circular tube in the air gap section between the explosive cartridges, thereby avoiding the problem that after the explosives are blasted, the blasting pressure in the air gap section is relatively low, and the blasting pressure is weakened by the circular tube of equal thickness, resulting in under-digging of the hole.
Claims
1. A smooth blasting charging device, characterized in that: include: A round tube is a hollow structure with one end closed; Explosive cartridges are cylindrical in shape and are installed in circular tubes in a dispersed manner and the number is not less than 2; The bracket has a length of not less than 20 cm and not more than 100 cm, and two ends of the bracket are respectively connected to two adjacent explosive rolls; A detonator, inserted into one of the explosive charges.
2. A smooth blasting charging device as claimed in claim 1, characterized in that: The round tube is a polymer tube with an outer diameter smaller than the bore diameter and an inner diameter larger than the diameter of the explosive roll. Air interval sections are arranged at intervals along the length direction of the round tube. The wall thickness at the air interval section is 0.5-1mm, and the wall thickness of the round tube at the non-air interval section is 1-4mm.
3. A smooth blasting charging device as claimed in claim 2, characterized in that: The wall thickness of the round tube is 1-4 mm, and the outer side of the round tube is cut and thinned by 3-3.5 mm at the air gap section.
4. A smooth blasting charging device as claimed in claim 1, characterized in that: The explosive roll is an emulsion explosive with a diameter of not less than 32 mm, a length of 5 cm to 30 cm, and a density of 0.95 to 1.3 g / cm 3 , detonation speed is greater than 3200m / s, and the detonation distance is ≥3cm.
5. A smooth blasting charging device as claimed in claim 1, characterized in that: The two ends of the bracket are constructed as a hollow structure, and the proportion of the cross-sectional area of the bracket on the cross-sectional area of the circular tube to the cross-sectional area inside the circular tube is not greater than 10%.
6. A smooth blasting charging device as claimed in claim 1, characterized in that: The two ends of the bracket are detachably connected to the ends of the explosive roll.