CN111486759B - One-time controlled blasting demolition method for elevator shaft outside dam body - Google Patents
One-time controlled blasting demolition method for elevator shaft outside dam body Download PDFInfo
- Publication number
- CN111486759B CN111486759B CN202010440289.4A CN202010440289A CN111486759B CN 111486759 B CN111486759 B CN 111486759B CN 202010440289 A CN202010440289 A CN 202010440289A CN 111486759 B CN111486759 B CN 111486759B
- Authority
- CN
- China
- Prior art keywords
- row
- blasting
- elevator shaft
- holes
- dam body
- 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.)
- Active
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000002360 explosive Substances 0.000 claims abstract description 38
- 238000005553 drilling Methods 0.000 claims abstract description 31
- 238000005474 detonation Methods 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 8
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000002893 slag Substances 0.000 abstract description 5
- 238000012795 verification Methods 0.000 abstract 1
- 239000003814 drug Substances 0.000 description 12
- 229940079593 drug Drugs 0.000 description 10
- 238000000926 separation method Methods 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/02—Particular applications of blasting techniques for demolition of tall structures, e.g. chimney stacks
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
一种安全高效的对坝体外电梯井进行爆破拆除的施工方法，其特征在于对坝体外电梯井整体一次性爆破拆除，由布孔技术、装药技术，起爆网络连接技术组成的爆破技术方案。技术流程：炮孔孔径d选择→确定钻孔深度H1→确定单耗药量K→初定炮孔位置→计算单孔装药量Qn→确定堵塞长度Ls→复核炮孔间排距→炮孔装药→连接起爆网络。本发明避免了多次炮孔造孔作业，炮孔装药和连接爆破网络等工序，提高了效率。孔内雷管选用延时雷管，能更好的利用爆破所产生的动能，爆破效果最佳。绘制爆破网格图，能更精确的计算所需药量。在外侧的三面墙体内也布置了炸药，有利于墙体破碎，便于后期清渣运输。
A safe and efficient construction method for blasting and demolishing the elevator shaft outside the dam body, characterized by the one-time blasting and demolishing of the elevator shaft outside the dam body as a whole, and a blasting technology scheme consisting of hole layout technology, charging technology, and detonation network connection technology. Technical process: selection of blasthole diameter d → determination of drilling depth H1 → determination of single consumption K → initial determination of blasthole position → calculation of single hole charge Qn → determination of blockage length Ls → verification of row spacing between blastholes → blasthole charging → connection of detonation network. The present invention avoids multiple blasthole drilling operations, blasthole charging, and connection of blasting networks, thereby improving efficiency. Delay detonators are used as detonators in the holes, which can better utilize the kinetic energy generated by the blasting and achieve the best blasting effect. Drawing a blasting grid diagram can more accurately calculate the required amount of charge. Explosives are also arranged in the three outer walls, which is conducive to wall crushing and convenient for later slag removal and transportation.
Description
Technical Field
The invention relates to the field of concrete blasting demolition, and is particularly suitable for dam body outer elevator well control blasting demolition construction.
Background
The blasting demolition technology is a main means for demolishing large buildings, and plays an important role in social construction and economic development. The blasting demolition control technology is a blasting technology for controlling pollution such as scattered matters, earthquakes, air shock waves, smoke dust, noise and the like generated by the explosion of explosive objects in the engineering blasting process by a certain technical means. The contents required for the control blasting are:
1. controlling the blasting range, only destroying the blasted part, and keeping the integrity of the rest parts;
2. dumping direction of the building after blasting;
3. Controlling the distance of scattered objects generated during blasting;
4. intensity of air shock wave and noise.
In the construction of demolishing a concrete gravity dam, the outer elevator shaft of the dam body needs to be demolished firstly at the outer side of the gravity dam, the outer elevator shaft of the dam body is higher from the ground, the elevator shaft is three sides to the sky, the used concrete of the elevator shaft is reinforced concrete, the strength is higher, and the dam body outer elevator shaft is demolished by layers at present, so that the following problems exist:
(1) The construction procedures of hole making operation, hole charging, connecting blasting network and the like are carried out for a plurality of times, the more layering is, the more manpower and material resources are consumed, the greater the safety risk is, and the construction period is possibly delayed.
(2) After each layer of blasting is finished, the blasting surface slag removal is needed, then the next layer of blasting operation is carried out, the working procedure of blasting surface slag removal is increased, time and labor are wasted, and the construction cost is increased.
(3) The wall body of the elevator shaft outside the dam body cannot be precontrolled due to long building time, strength and the like, after the previous layer of blasting is dismantled, the influence of blasting impact on the next layer of concrete is uncertain, the integrity of the next layer of concrete is very likely to be influenced, the next layer of blasting cannot be continued, and the elevator shaft wall body is dismantled through manual machinery, so that the dismantling time and the labor intensity of workers are greatly increased.
Disclosure of Invention
The invention aims to overcome the defects of layered demolition of the existing outer elevator shaft of the dam body and provides a safe and efficient one-time control blasting demolition method of the outer elevator shaft of the dam body.
The technical scheme adopted by the invention is that the method for controlling blasting demolition of the dam outer elevator well at one time is characterized in that the method for blasting demolition of the dam outer elevator well at one time is adopted for the whole dam outer elevator well, and comprises three parts of hole distribution and charging methods of the dam outer elevator well and the dam body connection part, hole distribution and charging methods of the dam outer elevator well wall body, and detonation network connection methods:
1.1. holes are distributed at the joint of the elevator shaft outside the dam body and the dam body the charging method comprises the following steps:
1.1.1 selecting the bore diameter of a blast hole, namely vertically drilling holes from top to bottom on the surface of an elevator shaft outside a dam body by using a drilling machine, wherein the bore diameter d is 75mm-100mm;
1.1.2 drilling depth determination, wherein the actual height of an outer elevator shaft of a dam body is H (the distance from the dam face to the bottom after mechanical dismantling of an elevator machine room above the elevator shaft is completed), the blast hole ultra-depth H is determined, the blast hole drilling depth is H 1 =H+h, the blast hole ultra-depth is h= (0.2-0.3) W, and W is the minimum resistance line;
1.1.3 determining the dosage K of the single Kong Hao, firstly determining the strength grade of concrete, corresponding to the rock category, and then checking the loosening medicine bag K value corresponding to the unit dosage K value table in the table 2 in the method for determining the unit dosage K value of the blasting site. The K value of the last row of blast holes is 0.1kg/m 3-0.3kg/m3 larger than that of the previous row of blast holes, so as to generate larger blasting thrust than that of loose blasting, and finally achieve the purpose of blasting separation of the elevator shaft and the dam body;
1.1.4 determining the positions of the blastholes, wherein the row spacing a and the interval b are determined, when the thickness D 1 of the connecting part of the outer elevator shaft of the dam body and the dam body is smaller than or equal to 1.5m, single-row blastholes are arranged at the connecting part of the elevator shaft, the distance between the centers of the blastholes and the adjacent sides is the row spacing a, a= (0.5-0.8) D 1, the distances between the centers of the blastholes and the adjacent sides are equal to the row spacing a, after the two side holes are determined, the middle blastholes are arranged at the equal interval b, b/a=1.0-1.3, when the thickness D 1 is smaller than 3.5m, the connecting part of the blastholes is arranged at the connecting part of the elevator shaft of the two rows, the distance between the centers of the front blastholes and the adjacent sides is 1.2-1.5m, the distances between the centers of the blastholes and the adjacent sides are equal to the row spacing a 1, and the middle blastholes are arranged at the equal interval b after the two side holes are determined, and when the arrangement of the blastholes is arranged at the interval b=1.5-2.0-2.35 m, and the first row spacing is 2.1-35 m;
1.1.5 calculation of single hole charge Qn, namely drawing a blasting grid graph, wherein the blasting grid is rectangular, the central line of one row of holes of the single row of holes is one straight edge of the rectangle, the central lines of two adjacent holes are the other straight edge of the rectangle, the other two straight edges of two side holes are respectively a free surface, the other two straight edges of the middle hole are respectively the free surface and the central lines of two adjacent holes on the other side, the grid graph of the first row of holes of the double rows of holes is identical to that of the single row of holes, the second row is in a straight line with the first row, the two sides of the blasting grid, which are perpendicular to the straight edge of the rectangle, of the second row, are identical to the first row of holes, the blasting rectangular grid is the calculation basis of the single hole blasting square V n, V n＝Sn is H, the single hole blasting square is determined, and the single hole blasting square is fixed in the actual construction process, so that when the Q n value is calculated, the maximum approach K value of Q n/Vn is met, and V n is the corresponding volume.
1.1.6 Selecting yellow mud as a blasthole plug, wherein the plugging length is in direct proportion to the blasthole aperture and in inverse proportion to the specific explosive consumption, referring to the value in table 1 in calculation of blasthole plugging length, loosening the theoretical range of the blasthole plugging length L s to be 1.5m-2.0m, and if the calculated single Kong Yaoliang length plus the plugging length is greater than H, re-selecting the distances a and b among blastholes;
1.2. According to the method for arranging holes and charging the holes in the elevator shaft wall outside the dam body, the thickness D 2,D2 of the elevator shaft wall is less than or equal to 0.6m, the arrangement of the blast holes is not considered, D2 is less than or equal to 2.5m, 1-2 blast holes are drilled in the center of the wall, when the number of the blast holes is 2, two blast holes are symmetrically distributed in the center, and the single hole blasting square V n＝D2 2 is H.
When the single-hole drug loading Q n value is calculated, the maximum approach K value of Q n/Vn is met, and the drilling depth, the drilling aperture, the single-hole drug loading K value and the blocking length are determined as above;
1.3. The detonating network connection method is that the detonating network adopts a non-electric millisecond detonator detonating network which is economical and practical, the detonating cord detonates, and the detonating cord adopts multiple connection (equivalent to U-shaped connection). The detonation network connection mode is inter-hole millisecond blasting, 1 ms15 sections of detonators (preventing one of them from being damaged) are respectively arranged at the bottom and the top in the hole, the delay is 880ms, and the leg wires of the detonators are led out to be connected with the main wire to the same section of adjacent holes. The interhole force detonator adopts ms2 sections (2 sections) and has a delay of 25ms, and is detonated by a firing gun. The detonation sequence is that the explosives in the wall body are detonated simultaneously, and then the explosives at the connecting parts are detonated sequentially from right to left or from left to right. And (3) completing the connection of the blasting network, and calculating that the maximum single-shot drug quantity Q n is smaller than Q S,QS to be the maximum allowable single-shot drug quantity.
The invention divides the dam outer elevator shaft into two different blasting units of the dam outer elevator shaft and the dam connecting part and the dam outer elevator shaft wall (three sides). When the thickness of the elevator shaft wall body is thinner, the factors such as drilling precision, too high elevator shaft, possible perforation and the like are considered, the elevator shaft wall body is only suitable for dismantling the elevator shaft with H being less than or equal to 20m, the elevator shaft wall body is drilled, charged and detonated at one time, the time is short, the blast hole drilling operation and blasting face slag removal are not required to be carried out for many times, and the elevator shaft wall body is safe and efficient. The blasting force is scattered to the periphery, when the single hole loading Q n is calculated at the joint of the dam outer elevator shaft and the dam body, the distance between the blast hole and the adjacent blank is used as the basis, and when the holes are distributed in the wall body of the dam outer elevator shaft, the thickness of the wall body is far smaller than the length of the wall body, and when the single hole loading Q n is calculated, the thickness of the wall body is used as the basis.
The method comprises the steps of 1.1.5 drawing a blasting grid in the calculation of single-hole drug loading Q n, when the thickness D 1 of a connecting part between an outer elevator shaft of a dam body and the dam body is smaller than or equal to 1.5m, arranging single-row blast holes at the connecting part of the elevator shaft, wherein the distance between the centers of the blast holes and the adjacent sides is equal to the distance a between the centers of the blast holes and the adjacent sides and is equal to the distance a between the centers of the two side and is equal to 0.5-0.8D 1, determining that the middle blast holes are arranged at equal intervals b, and when the distance a between the centers of the blast holes and the adjacent sides is 1.5m and is equal to the distance a 1 between the centers of the front blast holes and the adjacent sides and is 1.2-1.5m, determining that the distance a between the centers of the blast holes and the adjacent sides is equal to the distance a 1, and arranging the middle blast holes at equal intervals b after determining that the distances a 2 between the centers of the blast holes and the adjacent sides of the two sides are equal to the distance a 1.2-1.5m and the distance b between the blast holes of the second row and the first row and the distance a is equal to 1.5 m.
The bore diameter d of the blast hole is 76mm or 90mm. From the aspects of blasting economic effect and charging construction, the larger the hole diameter of the blast hole, the more the charging is, the more the single hole blasting square quantity is, the larger the hole diameter of the blast hole is, the more the charging is convenient, and the hole blocking phenomenon is not easy to occur. From the blasting effect, the smaller the hole diameter of the blast hole is, the more uniformly distributed the explosive in the blast hole is, and the blasting effect is better.
When a plurality of rows of blast holes are formed in the joint of the outer elevator shaft of the dam body and the dam body, the K value of the last row of blast holes is 0.1kg/m 3-0.3kg/m3 larger than that of the previous row of blast holes, and the purpose of blasting separation of the elevator shaft and the dam body is finally achieved in order to generate larger blasting thrust than that of loose blasting.
And the gun hole tool is drilled by a hydraulic drilling machine or a high wind pressure drilling machine.
W is equal to the minimum of explosive to the free surface, i.e. the minimum of pitch, row spacing and blockage.
The ultra-deep of the blast hole is calculated according to an empirical formula, wherein h= (0.2-0.3) W is the minimum resistance line, and the reinforced concrete coefficient is larger and 0.3 is taken.
The method for arranging holes and charging the powder in the elevator shaft wall outside the dam body is characterized in that the elevator shaft wall is thinner and is generally in the range of 0.6m-2.5m, and if the thickness of the wall is smaller than 0.6m, the arrangement of blast holes is not considered. Considering the influence of blasting scattered matters on surrounding building groups and the collision of the elevator shaft with the ground after falling, the whole wall body is not required to be loosened and blasted, and only 1 to 2 blast holes are required to be arranged in the middle of each wall body. And determining the connection part of the outer elevator well and the dam body of the same dam body by the drilling depth, the drilling aperture, the single drug consumption K value and the blocking length.
The dam body outer elevator shaft blasting demolition device has the advantages that the whole dam body outer elevator shaft is blasted and demolished once, multiple procedures of blasthole hole making, blasthole charging, blasting network connection and the like are avoided, and the efficiency is improved. The newly built dam, factory building or other building can be generally arranged behind the elevator shaft, and the detonation sequence adopted by the technical scheme is left and right direction instead of front and back direction, so that the harm of blasting scattered matters is reduced. 1 ms15 sections of detonators are respectively arranged at the bottom and the top in the hole, the delay is 880ms, two ms15 sections of detonators are arranged (one of the detonators is prevented from being damaged), the ms2 sections (2 sections) are selected as the interhole force detonators, the delay is 25ms, the kinetic energy generated by blasting can be better utilized, and the blasting effect is optimal. Drawing the blasting grid graph can calculate the required dosage more accurately. Explosive is also arranged in the three-side wall body on the outer side, the interior of the wall body is loosened by blasting, and the elevator shaft can be broken into small blocks after falling down, so that the later slag removal transportation is facilitated.
Drawings
FIG. 1 is a diagram of a blast hole site layout according to the present invention
FIG. 2 is a diagram showing the construction of a blasting charge at the junction of an outer elevator shaft of a dam and the dam
FIG. 3 shows an outer elevator shaft of a dam wall internal burst charging structure diagram
FIG. 4 is a diagram of a dam outer ladder well blasting initiation network arrangement
Wherein, the joint of the elevator shaft outside the dam body and the dam body is 1, the wall of the elevator shaft outside the dam body is 2, the blast hole is 3, the explosive roll is 4, the detonating cord is 5, the bamboo chip is 6, the detonating cap is 7, and the blast hole is 8 blocked.
Detailed Description
The invention will now be described in detail with reference to the drawings, the examples being set forth to provide a better understanding of the invention to those skilled in the art, but are not intended to limit the invention in any way.
In the embodiment 1, as shown in fig. 1, the size (unit is meter) of the dam outer elevator shaft is 16, the thickness of the joint between the dam outer elevator shaft and the dam is 2.28, the thicknesses of three wall bodies of the dam outer elevator shaft are 0.9, 1.5 and 1.5 respectively, the size of the middle rectangular elevator shaft is 5.05 x 6, and the dam outer elevator shaft is demolished by blasting integrally and once, and the method comprises the following steps of hole arrangement and charging at the joint between the dam outer elevator shaft and the dam, wall body 2 of the dam outer elevator shaft, and the method for connecting detonation networks:
1.1. holes are distributed at the joint of the elevator shaft outside the dam body and the dam body the charging method comprises the following steps:
1.1.1 selecting a blast hole aperture, namely vertically drilling holes from top to bottom on the surface of an elevator shaft outside a dam body by using a drilling machine, wherein the aperture d is 75mm-100mm, selecting the size of the existing drill bit, and drilling by using a hydraulic drilling machine, wherein the diameter d of the blast hole 3 is 90mm;
1.1.2 drilling depth H 1 the calculation formula of the borehole drilling depth is as follows:
H1=H+h (1)
The invention relates to a method for drilling Z-type holes, which is characterized in that the actual height of an H-dam outer elevator shaft is generally the distance from the dam surface to the bottom after an elevator machine room above the elevator shaft is mechanically dismantled, and H-blast holes are ultra-deep, and the method has the effects of overcoming the resistance of a chassis, ensuring that the fried chassis is relatively smooth, preventing the generation of the root, and taking 0.3 for a reinforced concrete coefficient, wherein the W is equal to the minimum value from an explosive to an empty surface, namely the minimum value of the pitch and the blockage of the holes, and the W=0.45 m-0.75 m.
1.1.3 Determining a single Kong Hao dosage K, namely firstly determining the strength grade of concrete, corresponding to the rock category, then checking a loose explosive charge K value corresponding to a unit explosive charge K value table in a method for determining a unit explosive charge K value of a blasting site (method for determining a unit explosive charge value of a blasting site (10 in 1965 of highway)), wherein the strength grade of reinforced concrete of an elevator shaft is R28300D300, the strength is about IX for the rock grade, the corresponding loose explosive charge K value in a unit explosive charge K value table in a method for determining a unit explosive charge K value of a blasting site is checked, the blasting effect is best about 0.60kg/m 3, the single explosive charge K of T 1 rows of blast holes takes 0.60kg/m 3,T2 rows of blast holes K value which is 0.1kg/m 3-0.3kg/m3 larger than the K value of T 1 rows of blast holes, and finally achieves the aim of separating the elevator shaft from the body blasting by T 2 kg/m 3;
1.1.4 when the thickness D 1 of the connecting part of the outer elevator shaft of the dam body and the dam body is smaller than or equal to 1.5m, a single-row blast holes are arranged at the connecting part of the elevator shaft, the distance between the centers of the blast holes and the adjacent edges is equal to the row distance a, a= (0.5-0.8) D 1, the distances between the centers of the blast holes on two sides and the row distance a are equal, after two side holes are determined, the middle blast holes are arranged at equal intervals b, b/a=1.0-1.3, when 1.5m < D 1 <3.5m, the connecting part of the elevator shaft of the blast holes is arranged at two rows, the distance between the centers of the front blast holes and the adjacent edges is 1.2-1.5m, the distance between the centers of the blast holes on two sides and the adjacent edges is equal to the row distance a 1, after two side holes are determined, the middle blast holes are arranged at equal intervals b, when the blast holes on two sides are arranged at equal intervals, b/a=1.5-2.0, the second blast holes are arranged at equal intervals b=1.24-2.5-2.0, the distance between the first blast holes and the first row of the blast holes are distributed at the distance a 1.2m, and the distance between the first row is equal to the distance a 2.2 m, and the distance between the first row of the blast holes and the first row is equal to the distance 1.2.2 m, and the distance is equal to the distance between the first row of the blast holes and the distance 1.2m, and the distance is equal to the distance between the first row and the blast holes and the distance 1.2m and the distance between the main line and the main explosive line and 2m. Because a large number of dowel bars are arranged at the joint of the elevator shaft outside the dam body and the dam body, the row distance a is 1.2m, and the second row holes are positioned in the dam body, so that the joint dowel bars are damaged, and the elevator shaft is separated from the dam body. The row spacing is selected, the whole width is 8.4 meters, the distance between the first holes on two sides, namely the 1 st row hole and the 4 th row hole in the figure and the adjacent side is equal to the row spacing a,1.2m, the rest 2 blast holes are distributed at equal intervals in the middle of 6 meters, and the spacing b=2m.
1.1.5 Calculating the single hole charge Qn, namely drawing a blasting grid graph, wherein the blasting grid is rectangular, the central line of one row of holes of the single row of holes is one straight edge of the rectangle, the central lines of two adjacent holes are the other straight edges of the rectangle, the other two straight edges of two side holes are respectively a free surface, the other two straight edges of the middle hole are respectively the free surface and the central lines of two adjacent holes on the other side, the grid graph of the first row of holes of the double rows of holes is the same as that of the single row of holes, the second row of holes is in a straight line with the first row, the two sides of the blasting grid, which are perpendicular to the first row of holes, of the straight edge of the rectangle are respectively connected with the central line of the first row of holes, are the same as that of the first row of holes, the blasting rectangular grid is the calculation basis of the single hole blasting square V n, V n＝Sn is H, and when the single hole blasting square Q n value is calculated, the maximum approximate K value of Q n/Vn is met, and V n is the volume of the corresponding grid. The specific data are shown in Table 1.
According to the method for arranging holes and charging the holes in the elevator shaft wall body 2 outside the dam body, the thickness of the elevator shaft wall body is D 2,D2 -0.6 m, the arrangement of the blast holes is not considered, D 2 -0.5 m is not more than 0.6m, 1-2 blast holes are drilled in the center of the wall body, when the number of the blast holes is 2, two blast holes are symmetrically distributed in the center, the single-hole blasting square quantity V n＝D2 2 is H, and when the single-hole blasting square quantity Q n is calculated, the maximum approaching K value of Q n/Vn is met. The drilling depth, the drilling aperture, the unit drug consumption K value and the blocking length are determined as above;
The thickness of the three walls of the outer elevator shaft of the dam body is 0.9, 1.5 and 1.5 respectively, the size of the middle rectangular elevator shaft is 5.05 x 6, the blasting holes with the number of Z are blasting holes in the elevator shaft wall body, and 1 to 2 blasting holes are arranged in the middle of each wall body, and the number of the blasting holes is 4.
As shown in fig. 2 and 3, the method scheme provided by the invention is a medicine loading structure diagram. Because a large number of dowel bars are arranged at the joint of the elevator shaft outside the dam body and the dam body, the blast hole design unit consumption of the T2-1-4 rows is increased by 0.1kg/m3-0.3kg/m 3 on the basis of the T1-1-4 rows, and the purpose of blasting separation of the elevator shaft and the dam body is finally achieved in order to generate larger blasting thrust than loose blasting. The calculation formula of the single-hole drug loading is as follows:
Shan Kongzha dose (kg) =k (kg/m 3)*H(m)*V Single hole (m3) (2)
Blast hole loading conditions are as shown in table 1:
Table 1 blast hole charge condition table
| Hole number | Pitch of holes (m) | Distance (m) | H(m) | Unit consumption (kg/m 3) | Explosive amount (kg) |
| T1-1 | 1.2 | 2.2 | 16.0 | 0.60 | 25.5 |
| T1-2 | 1.2 | 2.0 | 16.0 | 0.63 | 24.0 |
| T1-3 | 1.2 | 2.0 | 16.0 | 0.63 | 24.0 |
| T1-4 | 1.2 | 2.2 | 16.0 | 0.60 | 25.5 |
| T2-1 | 1.2 | 2.2 | 16.0 | 0.78 | 33.0 |
| T2-2 | 1.2 | 2.0 | 16.0 | 0.78 | 30.0 |
| T2-3 | 1.2 | 2.0 | 16.0 | 0.78 | 30.0 |
| T2-4 | 1.2 | 2.2 | 16.0 | 0.78 | 33.0 |
| Z1-1 | 0.45 | 0.45 | 16.0 | 0.62 | 2 |
| Z1-2 | 0.75 | 0.75 | 16.0 | 0.56 | 5 |
| Z1-3 | 0.75 | 0.75 | 16.0 | 0.56 | 5 |
| Z1-4 | 0.75 | 0.75 | 16.0 | 0.56 | 5 |
1.1.6 Selecting yellow mud as a blasthole plug, wherein the plugging length is in direct proportion to the blasthole aperture and in inverse proportion to the specific explosive consumption, referring to the calculation of the blasthole plugging length (19 th coupon of mining and metallurgy engineering, 1999 12 months in 4 th period), the value of the table 1 is shown in the specification, the theoretical range of the loose blasthole plugging length L s is 1.5m-2.0m, and if the calculated single Kong Yaoliang length and the plugging length are larger than H, the distances a and b among blastholes are needed to be selected again;
The gel emulsion explosive roll 4 with phi 60 (single-tube explosive amount 1.5kg, single-tube length 46.5 cm) and phi 32 (single-tube explosive amount 0.2kg, single-tube length 24.5 cm) can be used as the explosive, and the uncoupled charge is adopted, so that the initial explosion pressure can be reduced, the ratio of overgrinding and throwing work can be increased. The blast hole of the joint of the elevator shaft and the dam body is selected to be phi 60, the length of the explosive column with the maximum loading according to the table is 22 x 0.4635=10.23 m, and the plugging length L s =2m is less than 16.0m, so that the requirements are met. The gun holes of the three-side wall body of the elevator shaft outside the dam body are colloidal emulsion explosive cartridges with phi 32. The explosive cartridges are all double-strand detonating cords 5, are bound by adopting bamboo chips 6, are charged at intervals, and are provided with a single-burst ms 15-section detonating cap 7 at the upper part and the lower part of the blast hole respectively. Yellow mud is selected as a blocking material for enabling the explosive to generate good blasting effect, blast holes are blocked, and the length Ls of the blast hole blocking is 2m.
As shown in fig. 4, in the method scheme provided by the invention, a detonation network layout is provided. The detonation network is an economic and practical non-electric millisecond detonator detonation network, the detonating cord detonates, and the detonating cord adopts multiple connection (equivalent to U-shaped connection). The detonation network connection mode is inter-hole millisecond blasting, 1ms 15 sections of detonators (preventing one of them from being damaged) are respectively arranged at the bottom and the top in the hole, the delay is 880ms, and the leg wires of the detonators are led out to be connected with the main wire to the same section of adjacent holes. The interhole force detonator adopts ms2 sections (2 sections) and has a delay of 25ms, and is detonated by a firing gun. The detonation sequence is that the explosives in the wall body are detonated simultaneously (Z1-1- -Z1-4 are detonated simultaneously after the firing gun is fired at 905 ms), then the explosives at the connecting part are detonated sequentially from right to left, and simultaneously, the explosives of two holes are detonated only (T1-4 and T2-4 are detonated at 930ms, T1-3 and T2-3 are detonated at 955ms, T1-2 and T2-2 are detonated at 980ms, and T1-1 and T2-1 are detonated at 1005 ms). The maximum single-sound drug quantity Q 1 of the detonation network is 63.0kg, the classes of surrounding protection buildings comprise a switching station, a factory building, a hydropower station, a central control room and the like, the distance from a blasting point is about 120m, the minimum allowable vibration speed is determined to be 0.5cm/s, the maximum single-sound drug quantity Q S =139 kg is calculated, and the requirement Q 1＜QS is met.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010440289.4A CN111486759B (en) | 2020-05-22 | 2020-05-22 | One-time controlled blasting demolition method for elevator shaft outside dam body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010440289.4A CN111486759B (en) | 2020-05-22 | 2020-05-22 | One-time controlled blasting demolition method for elevator shaft outside dam body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111486759A CN111486759A (en) | 2020-08-04 |
| CN111486759B true CN111486759B (en) | 2024-12-03 |
Family
ID=71795416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010440289.4A Active CN111486759B (en) | 2020-05-22 | 2020-05-22 | One-time controlled blasting demolition method for elevator shaft outside dam body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111486759B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112632759B (en) * | 2020-12-14 | 2022-09-23 | 武汉科技大学 | Probability calculation method for theoretical single-shot dose of millisecond delay priming network |
| CN114543603B (en) * | 2021-11-23 | 2023-07-28 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Determination method and device for mine blasting edge hole distance |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212227894U (en) * | 2020-05-22 | 2020-12-25 | 中国水利水电第十六工程局有限公司 | One-time blasting demolition device for elevator shaft outside dam body |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100680032B1 (en) * | 2000-08-11 | 2007-02-07 | 두산중공업 주식회사 | How to dismantle buildings by explosives |
| CN101709939B (en) * | 2008-12-03 | 2013-04-17 | 鞍钢集团矿业公司 | Initiation method of deep hole blasting for dismounting building |
| CN110553560B (en) * | 2019-09-11 | 2022-03-08 | 辽宁工程技术大学 | Blasting demolition method for building |
| CN111121575B (en) * | 2019-12-30 | 2022-04-19 | 中国十九冶集团（防城港）设备结构有限公司 | Construction Method of Shallow Loosening Controlled Blasting in Urban Deep Foundation Pit |
-
2020
- 2020-05-22 CN CN202010440289.4A patent/CN111486759B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212227894U (en) * | 2020-05-22 | 2020-12-25 | 中国水利水电第十六工程局有限公司 | One-time blasting demolition device for elevator shaft outside dam body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111486759A (en) | 2020-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109115061B (en) | A detonation control method for reducing blasting vibration | |
| CN113390308B (en) | Composite cut blasting structure and cut method thereof | |
| CN102878876B (en) | Mine roadway advancing and undermining method and main blasting parameters | |
| CN109238055B (en) | A kind of medium-deep hole segment blasting method and device | |
| CN104482816B (en) | A kind of vertical periphery segment algorithm gradient presplit blasting method and device | |
| CN103123247A (en) | Damping blasting method for steep dip small crossing angle layered surrounding rock small-distance tunnel excavation | |
| CN114166082B (en) | Tunnel advanced drilling hole combination accurate control blasting structure and construction process | |
| CN111486759B (en) | One-time controlled blasting demolition method for elevator shaft outside dam body | |
| CN102494571A (en) | Construction method for damped blasting of tunnels | |
| CN112595190B (en) | Vertical shaft deep hole large circulation blasting construction method | |
| CN104913696A (en) | Side slope excavation smooth-surface blasting-method construction method | |
| CN101419040A (en) | Deep hole blasting method in large aperture composite undermine | |
| CN113720226A (en) | Small-section upward blind raise one-shot blasting well-forming blast hole arrangement structure and method | |
| CN108915694B (en) | Construction method for tunnel lower-layer step full-section protective-layer-free extrusion blasting and road repairing and access protection | |
| CN109974545B (en) | A method for the treatment of suspended ceilings in medium-deep hole blasting in a segmented caving method | |
| CN110500926A (en) | A Method for Charging Explosives at Intervals in Deep Hole Blasting | |
| CN104847350A (en) | Method for treating suspended roof by medium-length hole blasting | |
| CN104457466B (en) | A kind of blasting method of tunnel open excavation section | |
| CN110196002B (en) | A safe and efficient blasting construction method for shaft wall beam nest | |
| CN108413822B (en) | A shock-absorbing blasting method for upward fan-shaped medium-deep holes | |
| CN204495211U (en) | A kind of blasting hole arrangement system of tunnel open excavation section | |
| CN204574977U (en) | A kind of deep hole blasting grouting for water blocking device | |
| CN212227894U (en) | One-time blasting demolition device for elevator shaft outside dam body | |
| CN114382489A (en) | Tunnel vibration reduction control blasting structure and construction method | |
| CN110455137B (en) | Extrahole differential networking construction method for vibration reduction blasting of underground excavation tunnel |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |