CN114688929A - One-time blasting construction method for newly added drop shaft of underground drop shaft - Google Patents
One-time blasting construction method for newly added drop shaft of underground drop shaft Download PDFInfo
- Publication number
- CN114688929A CN114688929A CN202210304699.5A CN202210304699A CN114688929A CN 114688929 A CN114688929 A CN 114688929A CN 202210304699 A CN202210304699 A CN 202210304699A CN 114688929 A CN114688929 A CN 114688929A
- Authority
- CN
- China
- Prior art keywords
- holes
- hole
- blasting
- drop shaft
- ore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
Abstract
The invention discloses a one-time blasting construction method of an underground orepass with newly added branch orepasses, which comprises the following steps: constructing a ore removal connecting channel for ore removal on the horizontal main ore pass needing to be added with the branch ore pass and the side surface of the ore pass of the stope; the ore removal gangway and the main draw shaft are not communicated, a rock pillar is reserved between the ore removal gangway and the main draw shaft, parallel drill holes with inclination angles are drilled at the bottom in the ore removal gangway by a drilling machine, the parallel drill holes comprise a primary blasting hole positioned at the center, a plurality of empty holes positioned around the primary blasting hole and collapse holes positioned at the periphery of the empty holes, and the main draw shaft is formed by blasting once by utilizing a differential blasting technology. The method has the advantages that reasonable hole distribution and blasting parameters are selected, the compensation space is created by adopting the differential blasting technology to finish the blasting of the branch draw shaft at one time, drilling and blasting operations can be finished in a roadway, the draw shaft is far away, the problems of large protection workload, low efficiency, poor safety and the like in the construction of the branch draw shaft are solved, and the construction method of the branch draw shaft is high in mechanization degree, low in labor intensity, high in efficiency and good in safety.
Description
Technical Field
The invention relates to the technical field of drop shaft transportation, in particular to a one-time blasting construction method of a newly added drop shaft of an underground drop shaft.
Background
In the process of underground mining, the chute is widely applied as an important mode for carrying ores by using the self weight of the ores to slide from top to bottom, and is a key project of the whole production system. The draw shaft is habitually divided into a main draw shaft and a stope draw shaft, and the branch draw shaft is a roadway which is used for communicating the ore removal connecting passage with the main draw shaft and the stope draw shaft and has an inclination angle of 45-65 degrees, and is an important component of a draw shaft system. In actual mining activities, a branch chute is often required to be newly added at a certain level of a main chute and a stope chute so as to meet the ore removal requirement of a stope. However, the main orepass and the stope orepass are affected by long service life, large vertical height, frequent impact of ores and the like, so that the side walls of the main orepass and the stope orepass are easy to collapse, and great safety risks exist in the process of constructing the branch orepass. The tunneling and excavating method widely adopted for branch drop shaft construction has the advantages that constructors are exposed in the drop shaft, the construction difficulty is high, the period is long, the protection workload is large, the cost is high, the safety is poor, and accidents are frequent; constructors need to work at the through part of the branch orepass and the orepass, the orepass wall above the construction level of the branch orepass is easy to collapse gangue, the orepass wall pumice needs to be cleaned before working, and the orepass is locked and sealed, so that the protective workload is large, the efficiency is low, the cost is high, and the safety is poor; the chute below the construction level of the branch chute needs to be filled by transporting waste rocks to prevent high falling, if the waste rocks are transported back or ore dilution is increased, if the ore is transported back, sintering of high-sulfur ores is prevented, the transportation cost of the waste rocks is high, the period is long, and the construction efficiency is low.
Chinese utility model patent publication No. CN214577175U discloses a short slant entry drop shaft transportation system, comprising a main drop shaft and a middle-section drop shaft; one end of the middle-section orepass extends to one side of the main orepass, and a protective stud is reserved between the middle-section orepass and the main orepass; and a short inclined orepass is arranged at the lower part of one end, close to the main orepass, of the middle-section orepass, and one end, far away from the middle-section orepass, of the short inclined orepass is communicated with the main orepass. Although the short inclined orepass is also formed by blasting, the length of the short inclined orepass is less than 10 meters, and the short inclined orepass is blasted in multiple times and then mucked by a small excavator. The method has low construction efficiency, high cost and poor safety. Therefore, a branch drop shaft construction method which is wider in application range, high in operation efficiency, low in construction cost and good in safety is needed.
Disclosure of Invention
The invention aims to solve the technical problems of low construction efficiency, higher cost and poorer safety of the conventional short inclined branch drop shaft, and provides a one-time blasting construction method for a newly added branch drop shaft of an underground drop shaft.
The technical scheme of the invention is as follows: the one-time blasting construction method of the newly added drop shaft of the underground drop shaft comprises the following steps: constructing a ore removal connecting channel for ore removal on the horizontal main ore pass needing to be added with the branch ore pass and the side surface of the ore pass of the stope; the ore removal gangway and the main draw shaft are not communicated, a rock pillar is reserved between the ore removal gangway and the main draw shaft, parallel drill holes with inclination angles are drilled at the bottom in the ore removal gangway by a drilling machine, the parallel drill holes comprise a primary blasting hole positioned at the center, a plurality of empty holes positioned around the primary blasting hole and collapse holes positioned at the periphery of the empty holes, and the main draw shaft is formed by blasting once by utilizing a differential blasting technology.
In the scheme, the number of the parallel drilling holes is 25, the horizontal inclination angles of the parallel drilling holes are 55 degrees, and the hole spacing is 40-45 cm.
In the above scheme, the initial explosion hole aperture is 127mm, the dead hole has 6, aperture 127mm encloses into a circular, the collapse hole has 18, aperture 70 ~ 90mm, evenly distributed is in interior circle, excircle and circumscribed in the square of excircle, evenly distributed has 6 collapse holes on the interior circle, evenly distributed has 8 collapse holes on the excircle, there are 4 tangency points department that lie in excircle and square in these 8 collapse holes, it has 4 collapse holes to distribute on four summits of square.
The differential blasting technology in the scheme comprises the following steps: continuously filling porous granular ammonium nitrate fuel oil explosives into a primary blasting hole and a blasting hole, filling a blasting bomb at the hole bottom and 3m away from the hole opening, filling a detonating tube detonator into the blasting bomb, wherein the plugging length of the detonating tube detonator is 30-40 cm, the primary blasting hole is detonated by adopting a 2-section millisecond delay detonating tube detonator, 2 blasting holes on the inner circle are detonated by adopting a 4-section one-half second delay detonating tube detonator, the rest blasting holes are detonated by adopting a one-half second delay detonating tube detonator, 2-3 holes are detonated at the same section, and one section is delayed between adjacent sections.
In the scheme, a concrete terrace with the thickness of 20cm is poured on the bottom plate of the ore removal connecting channel.
In the scheme, the primary explosion hole and the hollow hole are communicated with the main orepass.
In the scheme, the bottom of the primary explosion hole and the bottom of the collapse hole are reliably blocked.
In the scheme, the bottom of the ore removal channel is provided with a water collecting pit.
In the scheme, the distance between the bottom of the branch orepass and the ore drawing hopper is not less than 5m, and the distance between the ore position in the main orepass and the bottom of the branch orepass is not less than 3 m.
In the scheme, the thickness of the rock pillar is 3-4 m.
Compared with the prior art, the invention has the following beneficial effects:
by selecting reasonable hole distribution and blasting parameters and adopting a differential blasting technology to create a compensation space to finish the blasting of the branch draw shaft at one time, operators finish drilling and blasting operations in a roadway and keep away from the draw shaft all the time, the problems of large workload, low efficiency, poor safety and the like of the construction of the branch draw shaft are solved, and the construction method of the branch draw shaft is high in mechanization degree, low in labor intensity, high in efficiency and good in safety.
Drawings
FIG. 1a is a cross-sectional view of a lateral drop shaft I-I of the present invention;
FIG. 1b is a cross-sectional view taken along line II-II of FIG. 1 a;
FIG. 2a is a schematic diagram of hole distribution of a conventional branch orepass;
FIG. 2b is a schematic diagram of the hole arrangement of the branch and draw shaft of the present invention;
FIG. 3 is a schematic illustration of a lateral kick-hole arrangement of the present invention;
figure 4 is a schematic illustration of a charge configuration for a lateral orepass according to the invention;
FIG. 5 is a schematic illustration of a lateral kick shaft blasting of the present invention;
FIG. 6 is a photograph of the effect of the blasting of a lateral kick shaft according to the present invention;
in the figure: 1. a main draw shaft 2, a ore removal connection passage 3, a branch draw shaft 4, a branch draw shaft drilling hole 5, a concrete terrace 6 and a sump; 7. 8 parts of gangue, 9 parts of detonating tube detonator leg wire, 9 parts of detonating bullet, 10 parts of detonating tube detonator, 11 parts of steel wire, 12 parts of stemming, 13 parts of prefabricated hole-plugging cement block, Z1-Z19 parts of charging hole, K1-K6 parts of empty hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A connecting channel for ore removal is constructed on a main ore pass 1 needing to be newly added with a branch ore pass level and the side surface of a stope ore pass, an ore removal connecting channel 2 is not communicated with the ore pass, a 3-4 m thick rock pillar is usually reserved, a drilling machine is used for drilling a parallel drilling hole with an inclination angle in the ore removal connecting channel, namely a branch ore pass drilling hole 4, a branch ore pass 3 is formed through one-time blasting by utilizing a differential blasting technology, the ore pass angle is usually between 45 degrees and 65 degrees, the inclination angle of the branch ore pass is usually designed between 50 degrees and 65 degrees so as to be more beneficial to ore removal, an operator completes drilling and blasting operation in a roadway, the operation is always far away from the ore pass, the tunneling and the drilling are all constructed by adopting mechanical equipment, the mechanization degree is high, the labor intensity is small, the efficiency is high, and the safety is good, and the design scheme of the branch ore pass is shown in figures 1a and 1 b.
The core of the invention is to create a compensation space by adopting the differential blasting technology to finish the branch drop shaft blasting once, so that a research plan is made, and the key steps are as follows: determining a strategic objective, making a design scheme, carrying out a field test on the design scheme, and optimally designing and forming a demonstration process according to an experimental effect. The main contents are briefly described as follows:
one is to determine the objective of the attack. The length of the branch drop shaft can be determined to be 10-15 m according to the dip angle (50-65 degrees) of the branch drop shaft and the thickness (3-4 m) of a rock pillar, the section of the branch drop shaft can be determined according to the bucket capacity of a scraper, and the branch drop shaft is generally rectangular (2-3) x (2-3) m, so that the branch drop shaft with the length of 15m, the dip angle of 50-65 degrees and the section size (2-3) x (2-3) m formed by one-time blasting is used as an attack target.
Secondly, a design scheme is established.
(1) Creating a blasting compensation space scheme: the reasonable scheme for creating the blasting compensation space is selected to achieve the premise of the expected blasting effect, so that the creation of the blasting compensation space is the key for realizing one-time blasting into the branch drop shaft. The common methods for creating the compensation space by adopting the blasting cut mode comprise inclined hole cut, parallel hollow hole linear cut and mixed cut, because the length of a branch chute reaches 15m, the inclined hole cut cannot be adopted, and the mixed cut construction is relatively complex, so that the parallel hollow hole linear cut is preliminarily selected and adopted. According to the 'ore drawing theory basis' of the metallurgical industry publisher, the crushing expansion generated by the caving ore rock is called primary loosening, the primary loosening coefficient is 1.15-1.25, in order to ensure that enough compensation space is provided after the primary loosening of the blasting crushing expansion of the ore rock, the blasting compensation coefficient is larger than the primary loosening coefficient of the ore rock, and therefore linear cutting of large-diameter parallel holes is preferably adopted. According to the principle of feasible theory, convenient construction, economy and reasonableness, two large-diameter parallel hollow hole linear cutting design schemes (see figures 2a-2 b) are preliminarily selected, wherein one scheme is to arrange the hollow holes in the middle of the loading holes, and the other scheme is to arrange the hollow holes around the loading holes. The first design scheme has the advantages that the number of large-diameter holes is small, the construction efficiency is high, the hole spacing needs to be increased to avoid hole stringing when the hole depth is increased, so that the compensation coefficient is reduced, the compensation coefficient is reduced along with the increase of the hole depth, and the method is suitable for shallow hole cutting; the second design scheme is that the number of the large-diameter holes is large, the construction efficiency is low, the compensation coefficient caused by the increase of the hole depth can be offset by increasing the number of the empty holes and is reduced, the compensation coefficient is influenced by the hole depth and can be used for deep hole undermining, and through the comprehensive comparison, the large-diameter parallel empty hole linear undermining design scheme shown in figure 2b is adopted. (2) A hole distribution design scheme of a branch draw shaft is as follows: the branch drop shaft depth reaches 15m, in order to ensure that drill holes are not communicated with each other, the hole spacing of the drill holes can not be smaller than 30cm according to 1% calculation of the deviation rate of the drill holes, the compensation coefficient is larger than the primary loosening coefficient by 1.25, and the diameter of a primary explosion hole and a hole is 127mm and the diameter of a collapse hole is 90mm by combining the hole diameter of common drilling equipment. Finally, determining a hole distribution design of a branch draw shaft formed by one-time blasting as shown in figure 3, and arranging 25 parallel drill holes with inclination angles in total, wherein the horizontal inclination angles of the drill holes are 55 degrees, and the hole spacing is 40-45 cm; the aperture of the Z1 drilled hole is 127mm, and the Z1 drilled hole is a primary explosion hole; the hole diameter of the K1-K6 drilled hole is 127mm, and a compensation space of the first explosion hole is provided for non-explosive hollow holes; the aperture of the Z2-Z19 drilled hole is 90mm, and the drilled hole is a breakout hole; the section of the branch drop shaft is 2.5 multiplied by 2.5m, and the length is 15 m. K1-K6 enclose a circle, Z2-Z7 enclose an inner circle, Z8-Z15 enclose an outer circle, Z16-Z19 are located at four vertexes of a square, the square is internally tangent to the outer circle, and the tangent points are Z9, Z11, Z13 and Z15. (3) The method comprises the following steps: continuously filling porous granular ammonium nitrate fuel oil explosive into Z1-Z19 drill holes, filling detonating bombs 9 at the hole bottom and 3m away from the hole opening, filling detonating tube detonators 10 into the detonating bombs, leading one end of a steel wire 11 out of the drill holes, plugging the explosives by using stemming 12 at two ends, arranging prefabricated hole plugging cement blocks 13 at the bottoms of the drill holes, and extending detonating tube detonator leg wires 8 into the drill holes, wherein the charging structure is shown in figure 4. The Z1 primary explosion hole (namely, a cut hole) is usually detonated by a 2-section millisecond delay detonating tube detonator (MS 2), and the purpose of the primary explosion hole delay is to ensure that all detonators are ignited before detonation, so that the reliability of a detonating network is ensured; according to blasting theory test data, 4-section and half-second delay detonating tube detonators (HS 4) are adopted for Z2 and Z3 drilling holes to detonate, ore rocks are broken and separated at about 25mm after being blasted, and broken and separated gangue 7 completely falls in a 15m well to form a compensation space, which takes about 2s, so that the delay time of the Z2 hole is about 2s compared with that of the Z1 hole; the Z4-Z19 caving holes are detonated by adopting half-second delay detonating tube detonators, usually 2-3 holes are detonated at the same section, the caving holes have enough blasting compensation space, so that one section is delayed between adjacent sections, the blasting design is shown as 5, wherein MS2 represents 2-section millisecond delay detonating tube detonators, HS4 represents 2-section half-second delay detonating tube detonators, HS5 represents a plurality of 2-section half-second delay detonating tube detonators which are delayed at the same section of HS4, and HS 6-HS 10 are analogized in sequence. According to the checking calculation, the compensation coefficient of the initial explosion hole (namely the cut hole) is 1.27 to 1.25, and the compensation coefficient of the collapse hole is 1.3.
And thirdly, carrying out field test. On-site tests are carried out on certain ore 54-1# and 56-1# winches, and the optimization design is carried out according to the test effect. The newly-added ore pass at the ore removal level of the No. 56-1 ore pass-850 m is completely designed according to the scheme, and an advanced exploratory hole is constructed when the ore pass is close to the ore pass in the process of ore removal combined channel tunneling, so that a rock pillar between the ore pass and the ore removal combined channel is ensured to be not less than 3 m; during the installation process of the drilling machine, the influence of the unevenness of the ore removal channel bottom plate on the drilling precision is great, so that a horizontal concrete terrace with the thickness of 20cm is poured on the ore removal channel bottom plate in the operation range of the drilling machine; slag discharge water generated in the operation process of the drilling machine flows into the chute through the through hole, so that potential safety hazards exist, and a sump 6 is constructed in the ore removal channel; after drilling is finished, actual measurement is organized in time, every two of four collapse holes are communicated, and the same section of the communication hole (two holes are communicated due to deflection or fracture) is designed for detonation; through field tests, the method successfully realizes that 15m of orepasses are formed by one-time blasting, and the orepasses are completely communicated with the main orepass. After the lateral pass is formed, three-dimensional form scanning is carried out on the lateral pass, the blasting effect of the lateral pass is shown in figure 6, and it can be known from the figure that the formed lateral pass only has small parts of underexcavation and overbreak, the calculated overbreak amount accounts for 2.1 percent of the total volume of the lateral pass, the calculated underexcavation amount accounts for 3.2 percent of the total volume of the lateral pass, and the overbreak amount and the underbreak amount are small, so that the blasting effect of the lateral pass is good and the section is regular. The lumpiness of the on-site burst gangue is very small, so that the diameter of a burst hole can be properly reduced. The diameter of a caving hole of a newly added branch drop shaft of the No. 54-1 drop shaft is changed into 76mm, and through field tests, 15m drop shafts are successfully formed through one-time blasting, the section of each branch drop shaft is regular, and the scheme of optimizing the hole diameter of a drilled hole is verified on site.
And fourthly, optimizing design and forming an exemplary process. (1) Constructing a ore removal combined road on the side surface of the main draw shaft by adopting a rock drilling trolley, determining the section and the length of the combined road according to the operation parameters of a scraper, pouring a horizontal concrete terrace with the thickness of 20cm on a roadway bottom plate at the operation position of a drilling machine, and excavating a water collecting pit with the length of 80cm, the width of 60 cm and the depth of 40 cm; (2) determining the boundary of the ore pass by adopting an advanced prospecting hole or a laser scanning method, and ensuring that a rock pillar with the thickness of 3-4 m is reserved between the ore removal channel and the main ore pass; (3) the hole distribution design is shown in figure 4, 1 127mm drill hole is used as an initial explosion hole, 6 127mm drill holes are used as empty holes, 18 76mm drill holes are used as collapse holes, the number and the hole positions of the collapse holes can be properly adjusted according to the section size of the ore pass, and the horizontal inclination angles of the drill holes are designed according to 55 degrees in view that the ore pass with the horizontal inclination angle of 55 degrees can meet the requirements of most ore rock sliding; (4) correcting the installation position of a drilling machine and the inclination angle of a drill rod, controlling the drilling footage, plugging the orifice of the through hole by using a wood plug in time, ensuring the drilling precision to avoid hole string, and strictly prohibiting slag discharge from an underwater draw shaft; (5) actually measuring drilling data, and marking if a hole is formed; (6) the charging structure is shown in FIG. 5, porous granular ammonium nitrate fuel oil explosives are continuously loaded into a Z1-Z19 drill hole, a detonating bomb is loaded at the hole bottom and 3m away from the hole opening, a detonating tube detonator is loaded into the detonating bomb, and the blocking length is 30-40 cm; the design of the quail blasting is shown in fig. 5, an MS 2-segment millisecond delay detonating tube detonator is adopted as a Z1 primary blasting hole, HS 4-segment half-second delay detonating tube detonators are adopted as about 2s behind Z2 and Z3 second breakup holes, half-second delay detonating tube detonators are adopted as adjacent segments of the Z4-Z19 breakup holes, the half-second delay detonating tube detonators are adopted as the adjacent segments of the Z4-Z19 breakup holes, 2-3 breakup holes are in the same segment, and the serial holes are in the same segment.
The key points of the invention are as follows:
1. and determining the boundary of the ore pass by methods such as advanced prospecting or laser scanning, and the like, and reserving 3-4 m rock pillars between the ore removal channel and the ore pass to ensure the safety of drilling and blasting operation.
2. And pouring a 20 cm-thick concrete terrace on the roadway bottom plate at the operation position of the drilling machine, correcting the installation azimuth angle and the inclination angle of the drilling rod of the drilling machine, controlling the drilling footage, ensuring the drilling precision and avoiding the penetration of adjacent drill holes.
3. The cavity and the primary charge hole must be communicated with the chute, and the bottom of the charge hole must be reliably blocked, as shown in fig. 5.
4. And (3) blocking the orifice of the through hole by using a wooden plug in time, constructing a water collecting pit in the ore removal connecting channel, strictly preventing the underwater chute from discharging slag and avoiding the Puke of the funnel.
5. And (3) actually measuring drilling data, and if a string hole is marked, detonating the string hole at the same section.
6. And (4) checking and calculating the compensation coefficient of the initial explosion hole (cut hole) to ensure that the compensation coefficient is more than 1.25.
7. The primary explosion hole adopts MS 2-section millisecond delay detonating tube detonators, all the detonators are ensured to be ignited before explosion, and the reliability of an explosion circuit is ensured.
8. And the second blasting hole adopts HS4 section half-second delay detonating tube detonators, so that the blast gangue of the first blasting hole has enough time to fall to form a compensation space.
9. The ore position distance of the ore pass is ensured to be not less than 5m from the ore drawing funnel, and the ore drawing funnel is prevented from being damaged by blasting; and the ore position is ensured to be below 3m of the bottom of the newly added branch drop shaft, so that a stacking space is provided for blasting and dropping the gangue.
The invention has the beneficial effects that:
1. a branch ore pass is formed by primary blasting, the ore removal connecting channel is not communicated with the main ore pass before blasting, operators are always in construction in the ore removal connecting channel, operation at the communicated part of the main ore pass is not needed, the protection workload is small, the safety is good, and the problem that traditional excavation accidents are frequent is effectively solved.
2. The ore removal connection is constructed by adopting a drill jumbo, and the drilling hole is constructed by adopting a trackless multifunctional drilling machine, so that the mechanization degree is high, the construction efficiency is high, the cost is low, and the economic benefit is obvious.
3. And after drilling is finished, primary blasting is carried out to form a branch drop shaft, the branch drop shaft does not need to be filled with gangue, the float stone on the wall of the main drop shaft is not needed to be cleaned, the preparation workload is small, and the safety is good.
Claims (10)
1. The one-time blasting construction method of the newly added drop shaft of the underground drop shaft is characterized by comprising the following steps of: constructing a ore removal connecting channel for ore removal on the horizontal main ore pass needing to be added with the branch ore pass and the side surface of the ore pass of the stope; the ore removal gangway and the main draw shaft are not communicated, a rock pillar is reserved between the ore removal gangway and the main draw shaft, parallel drill holes with inclination angles are drilled at the bottom in the ore removal gangway by a drilling machine, the parallel drill holes comprise a primary blasting hole positioned at the center, a plurality of empty holes positioned around the primary blasting hole and collapse holes positioned at the periphery of the empty holes, and the main draw shaft is formed by blasting once by utilizing a differential blasting technology.
2. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 1, which is characterized in that: the number of the parallel drilling holes is 25, the horizontal inclination angles of the parallel drilling holes are 55 degrees, and the hole spacing is 40-45 cm.
3. The one-time blasting construction method of the newly added branch orepass of the underground orepass as claimed in claim 2, characterized by comprising the following steps: the hole diameter of the first explosion hole is 127mm, the number of the empty holes is 6, the hole diameter is 127mm, a circle is formed by enclosing, the number of the collapse holes is 18, the hole diameter is 70-90 mm, the empty holes are uniformly distributed on an inner circle, an outer circle and a square circumscribed on the outer circle, 6 collapse holes are uniformly distributed on the inner circle, 8 collapse holes are uniformly distributed on the outer circle, 4 points of tangency of the outer circle and the square are located in the 8 collapse holes, and 4 collapse holes are distributed on four vertexes of the square.
4. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 3, which is characterized in that: the differential blasting technology comprises the following steps: continuously filling porous granular ammonium nitrate fuel oil explosives into the primary blasting holes and the caving holes, filling priming bombs at the hole bottoms and 3m away from the hole openings, filling detonating tube detonators into the priming bombs, wherein the plugging length of the detonating tube detonators is 30-40 cm, the primary blasting holes are detonated by 2-section millisecond delay detonating tube detonators, 2 caving holes in the inner circle are detonated by 4-section half-second delay detonating tube detonators, the rest caving holes are detonated by 2-3 half-second delay detonating tube detonators at the same section, and one section is delayed between the adjacent sections.
5. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 1, which is characterized in that: and a concrete terrace with the thickness of 20cm is poured on the bottom plate of the ore removal channel.
6. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 1, which is characterized in that: and the primary explosion hole and the hollow hole are communicated with the main orepass.
7. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 1, which is characterized in that: and the bottom of the first explosion hole and the bottom of the collapse hole are reliably blocked.
8. The one-shot blasting construction method of the newly added branch orepass of the underground orepass according to claim 1, characterized by comprising the following steps: and a water collecting pit is arranged at the bottom of the ore removal channel.
9. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 1, which is characterized in that: the distance between the bottom of the branch orepass and the ore drawing hopper is not less than 5m, and the distance between the ore position in the main orepass and the bottom of the branch orepass is not less than 3 m.
10. The one-shot blasting construction method of the newly added drop shaft of the underground drop shaft according to claim 1, which is characterized in that: the thickness of the rock pillar is 3-4 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210304699.5A CN114688929A (en) | 2022-03-26 | 2022-03-26 | One-time blasting construction method for newly added drop shaft of underground drop shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210304699.5A CN114688929A (en) | 2022-03-26 | 2022-03-26 | One-time blasting construction method for newly added drop shaft of underground drop shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114688929A true CN114688929A (en) | 2022-07-01 |
Family
ID=82138188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210304699.5A Pending CN114688929A (en) | 2022-03-26 | 2022-03-26 | One-time blasting construction method for newly added drop shaft of underground drop shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114688929A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6314989A (en) * | 1986-07-03 | 1988-01-22 | 清水建設株式会社 | Blasting method in underground cavity excavation |
| CN104864783A (en) * | 2015-05-21 | 2015-08-26 | 南京梅山冶金发展有限公司 | Underground jack shaft uncovering method |
| WO2017092306A1 (en) * | 2015-12-03 | 2017-06-08 | 中车建设工程有限公司 | Medium-length hole large cross-section composite cut blasting structure and method |
| CN108613599A (en) * | 2018-05-03 | 2018-10-02 | 湖北三鑫金铜股份有限公司 | A method of segmentation courtyard simultaneous shaft sin king |
| CN110260731A (en) * | 2019-06-19 | 2019-09-20 | 山东金鼎矿业有限责任公司 | A kind of simultaneous shaft sin king construction method for drop shaft, cutting well |
| CN110307762A (en) * | 2019-08-08 | 2019-10-08 | 福州大学 | A kind of courtyard quick well formation method based on deep hole hole by hole initiation technique |
| CN111594174A (en) * | 2020-05-08 | 2020-08-28 | 中电建十一局工程有限公司 | Full-section one-time pore-forming segmented blasting vertical shaft excavation method |
| CN113720226A (en) * | 2021-08-31 | 2021-11-30 | 玉溪大红山矿业有限公司 | Small-section upward blind raise one-shot blasting well-forming blast hole arrangement structure and method |
| CN113804071A (en) * | 2021-08-18 | 2021-12-17 | 安徽金日晟矿业有限责任公司 | Underground mine medium-length hole blasting well forming technology |
-
2022
- 2022-03-26 CN CN202210304699.5A patent/CN114688929A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6314989A (en) * | 1986-07-03 | 1988-01-22 | 清水建設株式会社 | Blasting method in underground cavity excavation |
| CN104864783A (en) * | 2015-05-21 | 2015-08-26 | 南京梅山冶金发展有限公司 | Underground jack shaft uncovering method |
| WO2017092306A1 (en) * | 2015-12-03 | 2017-06-08 | 中车建设工程有限公司 | Medium-length hole large cross-section composite cut blasting structure and method |
| CN108613599A (en) * | 2018-05-03 | 2018-10-02 | 湖北三鑫金铜股份有限公司 | A method of segmentation courtyard simultaneous shaft sin king |
| CN110260731A (en) * | 2019-06-19 | 2019-09-20 | 山东金鼎矿业有限责任公司 | A kind of simultaneous shaft sin king construction method for drop shaft, cutting well |
| CN110307762A (en) * | 2019-08-08 | 2019-10-08 | 福州大学 | A kind of courtyard quick well formation method based on deep hole hole by hole initiation technique |
| CN111594174A (en) * | 2020-05-08 | 2020-08-28 | 中电建十一局工程有限公司 | Full-section one-time pore-forming segmented blasting vertical shaft excavation method |
| CN113804071A (en) * | 2021-08-18 | 2021-12-17 | 安徽金日晟矿业有限责任公司 | Underground mine medium-length hole blasting well forming technology |
| CN113720226A (en) * | 2021-08-31 | 2021-11-30 | 玉溪大红山矿业有限公司 | Small-section upward blind raise one-shot blasting well-forming blast hole arrangement structure and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102587916B (en) | A kind of ore caving afterwards filling mining methods | |
| CN102011589B (en) | Stope bottom structure suitable for underground two-step mining and production process thereof | |
| CN102808622B (en) | Method for recovering ore pillar by medium-length hole and deep hole combined blasting technology | |
| CN102071940B (en) | Construction method for mine shaft through multilayer goaf | |
| CN102183184B (en) | Blast method for realizing vibration attenuation and protection of early-age concrete lining during tunnel construction | |
| CN104532818A (en) | Treatment method for strip mine goaf | |
| CN102182461A (en) | Efficient mining method for thick metal ore body in slanting | |
| CN103437768B (en) | Pre-set space filling mining method without top column and bottom column | |
| CN101328809A (en) | Non-bottom pillar deep hole falling-back type mining method | |
| CN111894584B (en) | Cemented filling mining method for fully-pseudo-arranged reserved roadway of slowly-inclined thin ore body | |
| CN104806249B (en) | A kind of short vertical shaft pilot shaft tunneling construction method | |
| CN109252868A (en) | Hard-soft heterogeneous ground shield-tunneling construction boulder and basement rock protrusion processing method | |
| CN109000525A (en) | A kind of shield driving upper-soft lower-hard ground presplit blasting construction method | |
| CN106121643A (en) | The reserved retaining wall ore deposit two step nesting combination method of mining by the way of filling | |
| CN110331978A (en) | A kind of environment reconstruction segmentation medium-length hole afterwards filling mining method | |
| CN104596375A (en) | Fully mechanized excavation construction method for rock roadway | |
| CN105466292A (en) | Medium-length hole blasting technology used in semi-coal-rock roadway | |
| CN103982186B (en) | The vertical Inclined strips sublevel caving of oper cylinler retrusive | |
| CN110219650B (en) | Deep hole subsequent filling mining method in environment reconstruction stage | |
| CN103233739A (en) | Mining method for thick and large ore pillar under filling body package | |
| CN112324439A (en) | Mining method for inducing caving roadway roof | |
| CN107687339A (en) | A kind of efficient mining methods of Media thick and rake ore body | |
| CN103410513B (en) | Uneasily mining orebody mechanization process for stoping | |
| CN114688929A (en) | One-time blasting construction method for newly added drop shaft of underground drop shaft | |
| CN113404498B (en) | VCR mining method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |