CN107607009B - A kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district - Google Patents

A kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district Download PDF

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CN107607009B
CN107607009B CN201710821115.0A CN201710821115A CN107607009B CN 107607009 B CN107607009 B CN 107607009B CN 201710821115 A CN201710821115 A CN 201710821115A CN 107607009 B CN107607009 B CN 107607009B
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building
region
district
time
blasting
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CN107607009A (en
Inventor
刘成敏
罗福友
周浩仓
王云茂
刘红芳
龙辉
陶明
潘昌义
吴峰
吴卫强
许成卫
张鑫
谢发根
肖国喜
周凤仪
李斌
胡海
程三建
黄洪涛
刘郭洁
杨晖
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Jiangxi Guotai Wuzhou Blasting Engineering Co Ltd
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Jiangxi Guotai Wuzhou Blasting Engineering Co Ltd
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Abstract

A kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district, building is divided laterally into several pieces of zonules, laterally detonation is designed between each piece of region to delay the time, building to be torn open need to design corresponding blasting gap simultaneously, longitudinal region is also divided in breach scope, setting is longitudinal to delay the time, it is laterally delayed on the whole and the direction of blasting gap is mutually and intersects, it drills in load-carrying members in breach scope, powder charge, filling, networking, detonation, pass through the extension time of detonator, subregion detonation subregion destroys, it is involved mutually in the air between each region, then slump is contacted to earth successively, realize the technical goal that fore-and-aft tilt is collapsed district by district.The present invention can be suitable for complex environment, the demolition blasting of the building of structural modeling complexity, explosion slump vibration can be effectively reduced, so that building is fully disintegrated in the air, reduces the broken cost in later stage, realize that no explosion is shaken evil, and the environmentally friendly demolition effect of scarfing cinder is easy to.

Description

A kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district
Technical field
The present invention relates to a kind of method of Demolition by controlled blasting building, more particularly to a kind of building fore-and-aft tilt by The blasting demolishing method that area collapses.
Background technology
Explosion is a kind of energy-efficient technological means, the dismounting for towering, complicated building, explosion Construction method has absolute advantage.The technical principle of existing demolition blasting building is simpler, as long as making building collapsing i.e. Can, one or more blasting gaps are typically designed in the longitudinal direction, are designed the corresponding extension time along notch direction, are being lacked Borehole charge in load-carrying members in mouth range is successively detonated by delay detonator, to " chopping at a tree " equally from the width of building The energy that the side in direction is generated using explosive charge is in moment(Between the load-carrying members of practical different location explosive initiation when Between have time difference of half second grade or Millisecond)Emptying a part of load-carrying members keeps its unstability, building whole under self gravitation effect Body Directional Collapse.This process will produce some harm, predominantly blasting flyrock and vibration, and generating slungshot in order to prevent would generally Meticulous protection is carried out using a variety of means of defences and multilayer proofing material, it can effective control of flyrock;In order to reduce explosion Vibration, will be laid with a large amount of padded coaming or setting vibration damping ditch and vibration damping dike in range of collapsing, but drop effect of shaking is limited, if anti- Shield improper measures easily cause safety accident, such as flutter failure periphery underground pipe network, shake and split periphery and build(Structure)Build object etc..
In addition, during structure demolition is removed, it is only necessary to a small amount of explosive destroys its load-carrying members, because This, the slump vibration that the vibration that explosive itself generates generates when contacting to earth much smaller than building collapsing, so slump vibration is building Major hazard source during object demolition blasting, and existing blasting technique is difficult effectively to control this danger source.With quick-fried Broken technology application range is widened, and explosion objects perimeter environment becomes increasingly complex, especially in business district, in the area of city sensitivity Domain, it is necessary to which nearby residents and surrounding enviroment can be received for the harm for reducing explosion, it is ensured that safety accident does not occur and the thing that disturbs residents Part.Therefore, under existing situation, existing blasting technique just encounters a series of problem, is mainly manifested in:1, for structure Ideal effect is not achieved in the building that moulding is complicated, takes up a large area, existing blasting technique;2, existing blasting technique production Raw noise is big, vibration is big, is unacceptable in some complex environments;3, building total Collapse, often due to finally falling The part load-carrying members collapsed can not support active force produced by the building body that front is being collapsed and generate recoil, destroy periphery Installations and facilities;4, after building collapsing, without fully broken, it is also necessary to be crushed using mechanical equipment, cost is larger.
Invention content
Complex environment is can be suitably used for the purpose of the present invention is to provide one kind, is reduced building collapsing and is contacted to earth the slump of generation Vibration, and the blasting demolishing method that the building fore-and-aft tilt that building can be made fully to disintegrate in the air is collapsed district by district.
The blasting demolishing method that collapses district by district of building fore-and-aft tilt of the present invention, with the thinking of split plot design by heavy construction Object is divided into several pieces of zonules(Explosion unit), laterally detonation is designed between each piece of region and is delayed the time, while being waited tearing down and building and be built Object need to design corresponding blasting gap, and longitudinal extension time is arranged in breach scope, on the whole lateral delay and blasting gap Direction be mutually intersection.Drilling, powder charge, filling, networking, detonation in load-carrying members in breach scope, pass through prolonging for detonator Time difference phase, subregion detonation subregion are destroyed, are involved mutually in the air between each region, collide with each other midair disintegration, then collapses successively It falls and contacts to earth, it is ensured that the quality contacted to earth per separate explosion is smaller, realizes the technical goal that fore-and-aft tilt is collapsed district by district.
A kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district of the present invention, includes the following steps:
(1)According to the floor plan and height of building to be removed, the distribution situation of its load-carrying members is analyzed, calculating waits for The gross area, gross mass and its center of gravity of demolition of buildings.
(2)The height and range of its total Collapse direction and blasting gap are determined according to the surrounding enviroment of building to be torn open.
(3)The step(2)The calculating of cut height topple disintegration cut height by angle theoretical calculation of collapsing:
h = L·
In formula:hIt is blastingcutheight;L Span between two outer load-bearing pillars or wall;Collapse angle, degree, Frame structureValue:(Antidetonation), ;Frame-shear structureValue:The cut height of shear wall position is higher by frame 1~2 floor layer of height of frame notch.
(4)The minimum range needed in surrounding enviroment between building to be protected and building to be removed is determined, by protecting The type of object, which is tabled look-up, determines the slump vibration velocity of permission, according to《Shotfiring safety regulation》(GB6772-2014)In safe school Core formula calculates that the maximum slump that allows every time is contacted to earth quality, and specific formula is as follows:
In formula:v t - slump vibration velocity, cm/s are tabled look-up determination by the type of protection;
K t - attenuation coefficient,K t =3.37~4.09, generally take 3.37;
The breakdown strength of σ-ground medium, MPa generally take σ=10MPa;
β-damped expoential, -1.66~-1.80, take -1.66;
R-needs protection to the distance of slump touchdown point, m;
The maximum slump that M-allows every time is contacted to earth quality, t;
H-component gravity center height, m.
(5)By the step(1)Gross mass, the gross area and the step of middle calculating(4)The environment extrapolated is permitted A maximum slump is contacted to earth quality, and the flat of the number of regions for needing to divide whole building body in the plane and each region is calculated Equal area, specific formula for calculation are as follows:
The n values of calculating are not less than calculated value n if a decimal then upward rounding, actual division region time domain number,
In formula:MAlwaysThe gross mass of-building, t;
MPermit- maximum the slump allowed every time is contacted to earth quality, t;
The number of regions of the required divisions of n-, it is a;
SAlwaysTotal floor space of-building, m2
SPermitThe average area in-each region, m2
(6)Region division is carried out on the flat layout drawing of building, along the collapse direction of building, according to load-carrying members Number of rows is divided into 2~5 areas, and each area is related to 1~3 row's load-carrying members;Perpendicular to collapse direction institute subregion number by the step (5)The overall area number of middle calculating can show that the final region divided is in grid in the plane except the number of regions in collapse direction Shape.
(7)The step(6)When middle division burst region, the structural modeling of building need to be fully considered, ensure last rise Quick-fried load-carrying members can support the active force caused by building body that first detonates, and prevent from generating recoil when explosion, and setting is away from It caves in and is arranged to farthest row's load-carrying members for last, it is desirable that last two rows load-carrying members are wanted in subregion simultaneously namely region There are the load-carrying members of last row and row second from the bottom simultaneously, on this basis, the load-carrying members in each region can be nothing The distribution of rule.
(8)Within the scope of blasting gap(The longitudinal direction of building to be torn open)Longitudinal burst region is divided, generally with one layer for one A region, in each floor, transverse area is simultaneous with longitudinal region;
(9)The selected region detonated at first is that laterally its burst time, edge are designed in each region according to certain extension time difference The time difference is 50~110ms between the region that collapse direction is divided, and the time difference between vertical each region of collapse direction is little In 500ms, according to the precedence relationship of burst time, whole in the plane is in bias type in each region;Equally longitudinal also according to one The fixed extension time difference is that its burst time is designed in each region, is poor 50~110ms when each interregional;
(10)According to the step(2)、(3)The blasting gap of design, load-carrying members within its scope are bored Hole, powder charge, filling, networking, wherein according to step during powder charge(9)Designed by the designed burst time is packed into hole Detonating capsule, according to step during networking(9)Designed longitudinal time of delaying arranges propagation of explosion with propagation of explosion delay detonator Network, last ignition and detonation.
The step(10)In extension time of each region of transverse direction design generally realized with detonating capsule in hole, or use Relay extension is delayed to realize outside delay plus hole in hole;The extension time of longitudinal each region design generally with propagation of explosion detonator outside hole come After realization or each floor separately constitute network, then delay to realize with propagation of explosion detonator relay between the backbone at each network, No matter which kind of blasting network must assure that outside hole that detonator propagation of explosion terminates detonator in metapore and could start to detonate.
The step(10)、(11)In detonating capsule and propagation of explosion detonator can be detonator delay detonator, digital electric Detonator can also be that the two and the two or more are used with, and its purpose is to reach the burst time of design.
Compared with prior art, of the invention to have the advantage that:
(1)The present invention can effectively reduce explosion suitable for complex environment, the building of structural modeling complexity Slump is vibrated, and so that building is realized abundant disintegration in the air, is reduced the broken cost in later stage, prevent building recoil.
(2)Using the load-carrying members of the energy damages building of explosive charge, the shearing resistance bending resistance of building is reduced or eliminated Intensity, makes building in blasting instability moment district by district, and the gravity bending moment generated using building sole mass, potential energy, shearing are made Building embrittlement in the air, be broken and mutually collide, have the sufficient time in the air district by district, block-by-block disintegration at compared with primary structural component, respectively Equal mechanical functions are mutually involved between small structure, is further crushed and disintegrates, and buffering, which is caved in, successively contacts to earth, and avoids building It is whole hit ground caused by impact vibration, rebound slungshot, or occur as the accident of high tower, realize that no explosion is shaken evil, easily In the environmentally friendly demolition effect of scarfing cinder.
(3)During explosion, each burst region is detonated according to extension time order and function, is subjected to displacement after each region unstability Movement locus is collapsed successively in the horizontal in fore-and-aft tilt in the air since a certain region of building, district by district from It builds and builds owner's body, disintegration slump.
Description of the drawings
Fig. 1 is the schematic diagram of the building transverse blast region division of the present invention;
Fig. 2 is that building blasting gap of the present invention design divides schematic diagram with longitudinal burst region;
In attached drawing:The floor plan of 1- buildings, the region that 2- is laterally divided, the load-carrying members of 3- buildings, 4- The elevation of building, 5- blasting gaps, longitudinal the divided regions 6-, 7- collapse directions.
Specific implementation mode
Certain 17 layers of building, be special-shaped frame concrete structure, long 48m, the east wide 19m, the western wide 25m in end, high 63.2m, The blasting demolishing method that fore-and-aft tilt using the present invention is collapsed district by district is removed, and is as follows:
(1)According to horizontal layout Fig. 1 of building, it is known that the load-carrying members change in size of the building is larger, and in sky Between upper distribution it is irregular, the gross area is about 1178.5m2, gross mass is about 15839t, and height of C.G. is about 28m;
(2)The north of the building is more spacious, there is enough collapse fields, it is thus determined that collapse direction 7 is northwards;
(3)Blasting gap 5 highly determines that the east is 10.5m, and western end is 13.8m, and the range of floors being related to is one to four layer, And blasting gap 5 is made in the elevation of building according to Notch angle, namely delimit breach scope;
(4)It is 56m, the maximum slump that residential house allows to need the minimum range of residential house to be protected away from periphery according to the building Vibration velocity is 2cm/s, and extrapolate allows maximum slump to contact to earth quality for 1760t every time;
(5)By described(1)With(4)It understands to need the building being divided into nine burst regions 2 in 1 transverse direction of plane, i.e., The area of A1~A9, average each region are about 131m2
(6)Be four according to the number of rows of load-carrying members 3 along the collapse direction 7 of building, be divided into two i.e. A1 in region 2, A2;It is counted by the step perpendicular to collapse direction institute subregion 2(5)The overall area nine periods of middle calculating remove in the region of collapse direction Number two obtains four and half, therefore is divided into four regions 2 on vertical collapse direction, and the part having more is included in the 9th area Domain 2, the final region divided are in latticed in the plane;It is emphasized that regardless of floor, i.e., the region 2 laterally divided is In story height direction, each floor belongs to this region 2;
(7)During dividing burst region 2, it need to fully consider the structural modeling of building, in order to prevent explosion Recoil is generated in the process, ensures that the load-carrying members finally detonated can support the active force caused by building body that first detonates, setting It is that last is arranged away from the row's load-carrying members of collapse direction farthest, general last two rows of load-carrying members 3 want subregion simultaneously, i.e., Load-carrying members 3 containing last row and row last simultaneously in tetra- burst regions of A2, A4, A7, A9, as being held in region Whether 3 cross sectional shape of weight structure is regular little with the division relationship of region 2 with distribution, such as the load-carrying members 3 in the region A1, A5 2 Size differs, and arrangement is irregular;
(8)In 5 range of blasting gap(The longitudinal direction of building to be torn open)Longitudinal burst region 6 is divided, is generally with one layer One region 6, in each floor, transverse area 2 with it is simultaneous when longitudinal region 6;
(9)The northeast corner of selected building is as fuze action zone at first(That is A1), it is laterally each according to certain extension time difference Its delay initiation time is designed in region 2 and longitudinal each region 6.When transverse area 2 divides, the area that is divided along collapse direction 7 The time difference is 50~110ms between domain 2, as between A1 and A2, between A3 and A5;The time difference between vertical 7 each region 2 of collapse direction To be not more than 500ms, as between A1 and A3, between A2 and A4;Each region 2 according to the burst time precedence relationship, in the plane Whole is in bias type, and such as A2, A3, A4, A5, firing order is that A3 first detonates, and then A2 re-detonates, followed by A5 detonates, then is connect A4 detonations, A3 and A2, A5 and A4 respectively on an oblique line, and so on.Fabric structure certain positions such as A5 with Between A6(The corner of building), the sequence of successively detonation is thought over, such as A6, A5, A4, firing order is elder generation A6, is connect A5, last A4, on an oblique line;It is with one layer for a region 6 on longitudinal region 6, each region 6 gives 50~ The extension time of 110ms, specific time setting such as table 1:
The delay initiation time of 1 each burst region of table distributes
Burst region Delay the time(ms) Burst region Delay the time(ms)
A1 500 A6 1575
A2 1110 A7 2110
A3 1000 A8 2000
A4 1610 A9 2500
A5 1500 —— ——
B1 50 B3 150
B2 100 B4 200
(10)According to the step(2)、(3)The blasting gap 5 of design, load-carrying members 3 within its scope need to carry out Drilling, powder charge, filling, networking, wherein according to step during powder charge(9)The designed burst time is packed into accordingly in hole The other detonating capsule of section, according to step during networking(9)Designed longitudinal time of delaying is arranged with propagation of explosion delay detonator Propagation of explosion network, last ignition and detonation.
Laterally the extension time of each 2 domain of area design is generally realized with detonating capsule in hole, can also be to be delayed to add in hole The relay that is delayed outside hole is delayed to realize;The extension time that longitudinal each region 6 is designed generally is realized with propagation of explosion detonator outside hole, also may be used To be after each floor separately constitutes network, then delay to realize with propagation of explosion detonator relay between the backbone at each network.No matter Which kind of blasting network must assure that outside hole that detonator propagation of explosion terminates detonator in metapore and could start to detonate.
Detonating capsule and propagation of explosion detonator can be that Nonel detonator, digital electric detonator both can also be mixed, mesh Be design to be reached burst time.

Claims (8)

1. a kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district, it is characterised in that:It includes the following steps:
(1)According to the floor plan and height of building to be removed, calculate the gross area of building to be removed, gross mass and its Height of C.G.;
(2)The height and range of its total Collapse direction and blasting gap are determined according to the surrounding enviroment of building to be torn open;
(3)The minimum range needed in surrounding enviroment between building to be protected and building to be removed is determined, by protection Type, which is tabled look-up, determines the safe slump vibration velocity of permission, according to《Shotfiring safety regulation》(GB6772-2014)In safe school Core formula calculates that the maximum slump that allows every time is contacted to earth quality;
(4)By the step(1)Gross mass, the gross area and the step of middle calculating(3)The permitted maximum of environment extrapolated Slump is contacted to earth quality, and the explosion unit area number for needing to divide whole building body in the horizontal and average each list are calculated The area of member, and region division is carried out on the floor plan of building;
(5)Within the scope of blasting gap, longitudinally divided longitudinal burst region of building to be torn open, with one layer for a region;
(6)According to delaying, the time difference designs its burst time for laterally each burst region, and laterally upper entirety is in bias type for time setting, Equally also its burst time is designed for each region longitudinal according to the time difference of delaying;
(7)According to the step(2)The blasting gap of design, load-carrying members within its scope are drilled, powder charge, filling, Networking, wherein according to step during powder charge(6)The designed burst time is packed into the other detonating capsule of correspondent section in hole, According to step during networking(6)Designed longitudinal time of delaying arranges propagation of explosion network, rearmost point with propagation of explosion delay detonator Fire detonation.
2. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, it is characterised in that:It is described The calculating of blastingcutheight topple disintegration cut height by angle theoretical calculation of collapsing, specifically,
h = L·
In formula:H-is blastingcutheight, m;
L-is the span between two outer load-bearing pillars, walls, m;
The angle of collapsing of-frame structure.
3. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, which is characterized in that described The maximum slump allowed every time contact to earth quality, specific formula for calculation is as follows:
In formula:vt- slump vibration velocity, cm/s are tabled look-up determination by the type of protection;
Kt- attenuation coefficient, Kt=3.37~4.09;
The breakdown strength of σ-ground medium;
β-damped expoential;
R-needs protection to the distance of slump touchdown point;
The maximum slump that M-allows every time is contacted to earth quality;
H-component gravity center height, m.
4. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, it is characterised in that:It is described Division number of regions and average each region area specific formula for calculation it is as follows:
The n values of calculating are not less than calculated value n if a decimal then upward rounding, actual division region time domain number,
In formula:MAlwaysThe gross mass of-building;
MPermit- maximum the slump allowed every time is contacted to earth quality;
The number of regions of the required divisions of n-;
SAlwaysTotal floor space of-building;
SPermitThe average area in-each region.
5. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, it is characterised in that:It is building It builds and carries out region division on the flat layout drawing of object, specific method is the collapse direction along building, according to the number of rows of load-carrying members It is divided into 2~5 areas, each area is related to 1~3 row's load-carrying members;Perpendicular to collapse direction institute subregion number by the overall area that calculates Number can show that the final region divided is in latticed in the plane except the number of regions in collapse direction.
6. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, it is characterised in that:It is described The burst region laterally divided, it is that last is arranged to set away from the farthest row's load-carrying members of collapse direction, it is desirable that last two Row's load-carrying members want the load-carrying members that have last row and row second from the bottom in subregion simultaneously namely region simultaneously.
7. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, it is characterised in that:It is described The lateral time of delaying with longitudinal determination method for delaying the time be the region detonated at first to be selected, when according to certain extension Difference designs its burst time for laterally each region, and the time difference is 50~110ms between the region divided along collapse direction, vertically The time difference between each region of collapse direction is no more than 500ms, and longitudinal each region is poor 50~110ms when detonating.
8. according to the blasting demolishing method that building fore-and-aft tilt is collapsed district by district described in claim 1, it is characterised in that:It is described The design of each region of transverse direction extension time hole in detonating capsule come realize or hole in be delayed outside delay plus hole relay extension come It realizes;The extension time of longitudinal each region design is realized with propagation of explosion detonator outside hole.
CN201710821115.0A 2017-09-13 2017-09-13 A kind of blasting demolishing method that building fore-and-aft tilt is collapsed district by district Active CN107607009B (en)

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CN110387909B (en) * 2019-07-17 2021-08-03 福建江夏学院 Method for predicting horizontal extrusion safety of bridge blasting demolition on surrounding building pile foundation
CN110553560B (en) * 2019-09-11 2022-03-08 辽宁工程技术大学 Blasting demolition method for building
CN112923820B (en) * 2021-02-09 2022-09-09 江西荣达爆破新技术开发有限公司 Perforation charge explosion method suitable for blasting demolition of middle upright column
CN112985209B (en) * 2021-02-09 2022-09-09 江西荣达爆破新技术开发有限公司 Detonation method suitable for blasting demolition
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