CN102535877A - Building blasting demolition method - Google Patents
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- CN102535877A CN102535877A CN2012100079781A CN201210007978A CN102535877A CN 102535877 A CN102535877 A CN 102535877A CN 2012100079781 A CN2012100079781 A CN 2012100079781A CN 201210007978 A CN201210007978 A CN 201210007978A CN 102535877 A CN102535877 A CN 102535877A
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Abstract
The invention discloses a building blasting demolition method, and particularly relates to gradual directional rolling type blasting demolition method for buildings with mixed structures. The method includes following steps: realizing pre-demolition for walls of a building needing blasting demolition; arranging blasting cuts at the bottom of the building; drilling holes at the blasting cuts to form explosive holes; charging explosive in the explosive holes; dividing the building needing blasting demolition into a plurality of detonating areas along longitudinal axes and transverse axes and corresponding the detonating areas to a detonating time sequence; forming a longitudinal and transverse delayed directional collapsed detonating network of the gradual detonating areas by means of outer-hole detonators with shock-conducting tubes in the gradual detonating areas from back to front in a longitudinal direction and from one end to the other end or from two ends to the middle in a transverse direction; and protecting and realizing wire connection for the building, and finally detonating the detonating network. The building blasting demolition method for the buildings with mixed structures can accurately control a collapsing direction, blasting vibration and collapsing vibration are effectively reduced, and a collapsing length range can be reduced.
Description
Technical field
The invention belongs to a kind of building blasting demolishing method, the directed piecemeal rolling type blasting demolishing method of particularly a kind of combination construction building.
Background technology
In the prior art; According to the surrounding enviroment condition, the combination construction building adopts the cave in method of demolition blasting of directioning falling or original place mostly, and directioning falling is many opens an orientation notch in the building bottom; The original place explosion of caving in will be exploded a plurality of floors; The same sequential of each floor is detonated, and after cutout regions was scraped, building was just toppled over or the original place slump by the design toppling direction under the unstability moment loading that its deadweight produces.Adopt the method to remove building, generally press same section other detonator of axis employing, by row or queue quick-fried more.By row or queue that quick-fried often single to ring neat quick-fried dose big, the blasting vibration of generation is big more; The building scale of construction of contacting to earth is big, and the vibration of contacting to earth of generation is big.Therefore, the directioning falling method is applicable to that environment is uncomplicated, and the more abundant distance of collapsing is arranged, and vibration is required low ambient conditions; The explosion place of collapsing around often that caves in, original place is narrower and small, does not satisfy the distance condition of directioning falling, can be described as and does something against one's will, and the blasting vibration of its generation is also big, though the vibration of contacting to earth decreases, it is high to execute the many costs of quick-fried floor.Directed piecemeal rolling type blasting demolishing method has the advantage of these two kinds of methods concurrently; Orientation is on the directioning falling method, to improve piecemeal; The overall time directioning falling is divided into multiple bearing piecemeal topples over, the explosion otch carries out on the basis that global orientation is toppled over basically, and has suitably and dwindle.Directed piecemeal rolling type collapses and has reduced the neat quick-fried dose of single sound, has reduced blasting vibration; The building body resolved into repeatedly contact to earth, reduced the momentum that contacts to earth, reduced the vibration of contacting to earth; Directed piecemeal collapsing increased each interregional shear action, is easy to the building midair disintegration, and rolling type collapses and shortened the building distance of collapsing, and is the cave in new method of explosion of a kind of comprehensive orientation and original place.
Summary of the invention
The object of the present invention is to provide a kind of building blasting demolishing method.This method can accurately be controlled collapse direction, effectively reduces blasting vibration and slump vibration, and the blasting demolishing method of the combination construction building of the length range that can reduce to collapse.
The object of the invention is achieved through following technical scheme:
A kind of building blasting demolishing method may further comprise the steps:
(1) building wall that needs demolition blasting is carried out pre-demolition;
(2) in the building bottom explosion otch is set;
(3) hole in the explosion incision, form the big gun hole;
(4) powder charge in the big gun hole;
(5) will need the building of demolition blasting to be divided into a plurality of zones of detonating, the said regional correspondence of the detonating sequential of detonating according to longitudinal axis, axis of pitch; From back to front longitudinally, along laterally from an end to the other end or two ends to the centre, by the Nonel detonator of delaying time outside the binding hole, zone of detonating, form the blasting circuit of collapsing by the regional orientation of detonating of vertical, horizontal time-delay;
(6) to building protect, line, at last blasting circuit is detonated.
Preferably, said explosion otch is shaped as triangle or trapezoidal.
Preferably, the Nonel detonator of delaying time outside the hole in the zone of detonating of the same sequential of detonating in the said step (5) adopts and to link together the mode of grabbing greatly.
Preferably, be 400～1000ms laterally in the said step (5) by the regional time difference of detonating of detonating.
Preferably, be 300～1000ms vertically in the said step (5) by the regional time difference of detonating of detonating.
Further, the said zone of detonating is the section of detonating.
Further, after said building detonated, its mode of collapsing was collapsed for directed rolling type piecemeal.
This method adopts the directed piecemeal rolling type blasting demolishing method that collapses, and sets triangle or trapezoidal cut for 1 layer or 1～2 layer in the building bottom, and 2 layers of cut height and scope can be less than 1 layers; Non-bearing wall body and partial weight-bearing body of wall are carried out pre-demolition.
Described region-by-region or division piecemeal; In the vertical; The general transversal line of after going to, pressing is divided, and can be divided into the same area or the section of detonating by 1 near axis section, also can be divided into same section of detonating or zone by 1 above near axis section; Generally according to the storied building structure difference can be divided into 2～3 or more than the section of detonating or zone, arrange axis body of wall or post at last and can not hole or bore 1～2 row a small amount of big gun hole.
Described region-by-region or division piecemeal; In the horizontal; Press longitudinal axis division to the other end or two ends to the centre from an end; Can be divided into the same area or the section of detonating by 2 near axis sections, also can be divided into same section of detonating or zone by 2 above near axis sections, generally can be divided into a plurality of sections of detonating or zone according to the storied building structure difference.Consider the variation of building on transversary intensity, the both sides of structural strength sudden change place are divided into the same zone of detonating.
The described sequential of detonating (also we can say the networking connectivity scenario), in the vertical, from after forward; The Nonel detonator employing of the same sequential of detonating is bundled the mode of grabbing greatly; Get into next sequential again behind the external propagation of explosion relay detonator, and the like, be connected to the front row.
The described sequential of detonating (also we can say the networking connectivity scenario); In the horizontal, with being connected to front-seat detonator on vertically from end propagation of explosion detonator outside the other end (or from two ends to the centre) binding hole, relay is connected to an end end (or middle part) successively; Go into after the complete blasting circuit; The binding primer detonator can realize that the standard at whole networking is quick-fried in the end, realizes the dismounting purpose that the directed piecemeal rolling type of building collapses.
The described sequential of detonating contains the interregional time difference of vertical, horizontal, vertically between between 300～1000ms, laterally between between 400～1000ms.The sequential of detonating or networking connect sees Fig. 1.
For preventing building under great gravity pressure,, cause the preceding cave-in accident of explosion with the reserve part conquassation behind the pre-demolition; The order of pre-demolition should be undertaken by the principle of load bearing wall behind the first non; Non is removed as far as possible, and load bearing wall is suitably removed, and removes area and should carry out the structural stability check; Compressive strength to satisfy reserve part is criterion, and leaves 1.5～2 safety factor.
For easy construction, improve construction environment, aspect such as the reliability of guaranteeing to collapse considers; Pre-demolition can be according to the storied building structure characteristics; Between axis of pitch, forming the principle that connects hole carries out; Other or the dividing region of the so same section of detonating, more clear, also be beneficial to flow processs constructions such as boring, networking connection.
The present invention has the following advantages:
Adopt the explosion of caving in of more traditional directional blasting of the inventive method and original place, (1) has disperseed single loud once detonation dose, has reduced blasting vibration and noise; (2) detonate in body subregion in building, make building aloft piecemeal or the region-by-region disintegrate, the monolithic scale of construction of contacting to earth reduces, and has reduced the slump vibration of contacting to earth; (3) member is aerial shears fully, and broken disintegration is effective, and the scope of collapsing is little than directional blasting; (4) reduced explosion floor quantity, reduced greatly than the original place construction cost that caves in, the blasting harm effect reduces.
Description of drawings
The substructure of a kind of building blasting demolishing method that Fig. 1 provides for embodiment 1 detonate sequential and subregion vertical view.
The interlayer of a kind of building blasting demolishing method that Fig. 2 provides for embodiment 1 detonate sequential and subregion lateral view.
The substructure of a kind of building blasting demolishing method that Fig. 3 provides for embodiment 2 detonate sequential and subregion vertical view.
The substructure of a kind of building blasting demolishing method that Fig. 4 provides for embodiment 2 detonate sequential and subregion lateral view.
The substructure of a kind of building blasting demolishing method that Fig. 5 provides for embodiment 3 detonate sequential and subregion vertical view.
The substructure of a kind of building blasting demolishing method that Fig. 6 provides for embodiment 3 detonate sequential and subregion lateral view.
The specific embodiment
Below in conjunction with accompanying drawing and instantiation the present invention is further described.
Embodiment 1
This instance is to be objective for implementation with 8 layers of combination construction building, the long 84.9m of this building, wide 8.2m～10.0m, high 27.4m.This building bottom plane is irregular " ︿ " type and arranges about 6800 ㎡ of overall floorage.The bottom load-carrying members are column and the common load-bearing of load bearing wall, and body of wall is 37 walls; Column is of a size of 400 * 400mm.5 on stair are arranged, and floor is the 12cm precast plate.
Present embodiment specifically may further comprise the steps: pre-demolition; Establish cutout regions for 1～2 layer at building, and the position of will holing marks; Hole according to design parameters and sign 1～2 layer of cutout regions; Implement safety prevention measure; Try quick-fried in 1 layer of selected zone; Powder charge; Carry out the zone according to vertical partition dividing line 2 and horizontal partition dividing line 3 and divide, and carry out the networking connection; Explosion.
Its borehole blasting piecemeal or the region-by-region detonate the zone and the efficacy parameter of collapsing be:
1) burst region is divided and is detonated the time difference: according to storied building structure, be divided into a zone along per 1～2 organ timbering of building longitudinal axis or load bearing wall.Be divided into 30 zones altogether.The interval time difference between the adjacent area is adopted MS9 section (310ms).Detonate the zone division referring to Fig. 1.
2) explosion otch 5 data: explosion otch 5 is laid in 1～2 layer of building, adopts triangular incision.Building bottom B axle～A between centers explosion highly is 1.8m, and the B axle is 1.2 m; Two layers of B axle～A between centers explosion highly are 1.2m, and the B axle is 0.6 m.Explosion otch 5 is referring to Fig. 2, and A～F is the building axis.
3) the burst region internal offset is divided: filling MS18 section (1400ms) detonator in building bottom B axle～A between centers hole; Filling MS19 section (1700ms) in C axle～B between centers hole; C axle dress MS20 section (2000ms); Filling MS19 section (1700ms) detonator in 2 layers of B axle～A between centers hole, filling MS20 section (2000ms) in C axle～B between centers hole.The interlayer time difference draws the ginseng branch and sees Fig. 2, and firing order 1 is referring to Fig. 1 and Fig. 2.
4) the explosion diffusing scope of collapsing: the building body about 18m of the quick-fried heap preshoot in back that collapses, the quick-fried heap 5.2m that squints southwards, move 4.6m outside the north side, the quick-fried heap of the southern rear side of building body is to toppling over the about 2m of reciprocal displacement.The quick-fried heap of the northern rear side of building body is to toppling over the about 5m of reciprocal displacement.Quick-fried stack height reaches 8m at the height of corner, southern side, the high about 5m of the quick-fried stack height in all the other positions, and collapse direction 4 is referring to Fig. 1 and Fig. 2.
5) blasting vibration and the orientation by row contrast of collapsing: adopt directed piecemeal rolling type blasting demolishing method can the building be divided into 7 sections explosions piecemeal; Once neat quick-fried maximum dose Q=56kg; The north side is the protection impact point apart from the petrol filling station of 50m, and the vibration velocity of this house owed by a citizen is V=0.13cm/s.If this engineering adopts directional blasting, the building is divided into the once neat quick-fried maximum dose Q=115 kg of 3 sections explosions, the vibration velocity 0.18cm/s of corresponding house owed by a citizen.The blasting technique that adopting vertically delays time piecemeal combines with directioning falling makes once neat quick-fried maximum dose Q reduce 59kg, and blasting vibration speed has reduced 0.05cm/s in theory.
6) slump vibration and the orientation by row contrast of collapsing: adopt directed piecemeal rolling type blasting demolishing method, building is to be divided into 6 sections to collapse piecemeal, is object of protection with the petrol filling station of nearest north side 50m, and drawing at this place's slump vibration data is 0.38cm/s.If this engineering adopts by row the orientation explosion of collapsing, then building slump vibration is calculated according to 1/3 of gross mass, and then slump vibration velocity in petrol filling station's is 0.61cm/s, and the slump vibration velocity has reduced 0.23cm/s in theory.
Embodiment 2
This instance is to be objective for implementation with 8 layers of combination construction building, the long 62.6m of this building, wide 8.2m～19.6m, high 27.4m.This building bottom plane is " ﹃ " type and arranges about 6200 ㎡ of overall floorage.The bottom load-carrying members are column and the common load-bearing of load bearing wall, and body of wall is 37 walls; Column is of a size of 400 * 400mm.5 on stair are arranged, and floor is the 12cm precast plate.
Present embodiment specifically may further comprise the steps: pre-demolition; Establish cutout regions for 1～2 layer at building, and the position of will holing marks; Hole according to design parameters and sign 1～2 layer of cutout regions; Implement safety prevention measure; Try quick-fried in 1 layer of selected zone; Powder charge; Carry out the zone according to vertical partition dividing line 7 and horizontal partition dividing line 8 and divide, and carry out the networking connection; Explosion.
Its borehole blasting is piecemeal or parameter is divided in the zone of detonating, region-by-region and the effect of collapsing is:
1) burst region is divided and is detonated the time difference: according to storied building structure, be divided into a zone by two ends to per 1～2 organ timbering in centre or load bearing wall along the building longitudinal axis.Be divided into 28 zones altogether.The interval time difference between the adjacent area is adopted MS9 section (310ms).Fig. 3 is seen in the zone division of detonating.
2) explosion otch 10 data: explosion otch 10 is laid in 1～2 layer of building, adopts trapezoidal cut.Building bottom H axle～G between centers explosion highly is 2.4m, and the H axle is 1.0 m; Two layers of H axle～G between centers explosion highly are 2.1m, and the H axle is 1.0 m.Explosion otch 11 is seen Fig. 4, and G～I is the building axis.
3) the burst region internal offset is divided: filling MS18 section (1400ms) detonator in building bottom H axle～G between centers hole; Filling MS19 section (1700ms) in I axle～H between centers hole; I axle dress MS20 section (2000ms); Filling MS19 section (1700ms) detonator in 2 layers of H axle～G between centers hole, filling MS20 section (2000ms) in I axle～H between centers hole.Fig. 4 is seen in the division of the interlayer time difference, and firing order 6 is referring to Fig. 3 and Fig. 4.
4) the explosion diffusing scope of collapsing: the building body about 17m of the quick-fried heap preshoot in back that collapses, the quick-fried heap 3.2m that squints southwards, move 5.2m outside the north side, the quick-fried heap of the southern rear side of building body is to toppling over the about 2m of reciprocal displacement.The quick-fried heap of the northern rear side of building body is to toppling over the about 3.5m of reciprocal displacement.The about 5m of quick-fried stack height.Collapse direction 9 is referring to Fig. 3 and Fig. 4.
5) blasting vibration and the orientation by row contrast of collapsing: adopt directed piecemeal rolling type blasting demolishing method can the building be divided into 7 sections explosions piecemeal; Once neat quick-fried maximum dose Q=50kg; The north side is the protection impact point apart from the petrol filling station of 20m, and the vibration velocity of this house owed by a citizen is V=0.49cm/s.If this engineering adopts directional blasting, the building is divided into the once neat quick-fried maximum dose Q=105 kg of 3 sections explosions, the vibration velocity 0.73cm/s of corresponding house owed by a citizen.The blasting technique that adopting vertically delays time piecemeal combines with directioning falling makes once neat quick-fried maximum dose Q reduce 55kg, and blasting vibration speed has reduced 0.24cm/s in theory.
6) slump vibration and the orientation by row contrast of collapsing: adopt directed piecemeal rolling type blasting demolishing method, building is to be divided into 6 sections to collapse piecemeal, is object of protection with the petrol filling station of nearest north side 20m, and drawing at this place's slump vibration data is 1.67cm/s.If this engineering adopts by row the orientation explosion of collapsing, then building slump vibration is calculated according to 1/3 of gross mass, and then slump vibration velocity in petrol filling station's is 2.67cm/s, and the slump vibration velocity has reduced 1.0cm/s in theory.
Embodiment 3
This instance is with a long 41.4m, wide 15.5m, and 9 layers of combination construction building of high 32m are objective for implementation.Building bottom plane is " zigzag " and arranges about 5400 ㎡ of overall floorage.The 3 layers of load-carrying members in bottom are the load-bearing of 24cm concrete brick wall, are the common brick wall load-bearing of 24cm more than 4 layers.3 on stair are arranged, and floor is mainly the 12cm precast plate.
This present embodiment specifically may further comprise the steps: pre-demolition; Establish cutout regions for 1～3 layer at building, and the position of will holing marks; Hole according to design parameters and sign 1～3 layer of cutout regions; Implement safety prevention measure; Try quick-fried in 1 layer of selected zone; Powder charge; Carry out the zone according to vertical partition dividing line 12 and horizontal partition dividing line 13 and divide, and carry out the networking connection; Explosion.
Its borehole blasting is piecemeal or the zone of detonating, region-by-region is divided and the efficacy parameter of collapsing is:
1) burst region is divided and is detonated the time difference: according to storied building structure, along the building longitudinal axis by an end to the other end, laterally per from front to back 2 rows or 3 rows hold wall and are divided into a zone, are divided into 17 zones altogether.The interval time difference between the adjacent area is adopted MS11 section (460ms).Detonate the zone division referring to Fig. 5.
2) explosion otch 15 data: otch is laid in 1～3 layer of building, adopts trapezoidal cut.The explosion of building one deck highly is 2.4m, and two layers of explosion highly are 2.1m, and three layers of explosion highly are 1.2 m.Explosion otch 15 is referring to Fig. 6, and J～M is the building axis.
3) the burst region internal offset is divided: unified dress MS17 (1200 ms) in the hole.The time difference and the interlayer time difference are MS9 (310 ms) before and after cutting in the scope of back, and Fig. 6 is seen in the division of the interlayer time difference, and firing order 11 is referring to Fig. 5 and Fig. 6.
4) the explosion diffusing scope of collapsing: the body quick-fried heap in back that collapses in building mainly concentrates in the 13m scope before the road of southern side, and few clinker is scattered on the road, the quick-fried heap 8m that squints eastwards, and the back seat phenomenon does not appear in the north side, moves 2m outside the west side, west side and north side enclosure wall is not damaged.The trolley wire and the underground city planting ductwork of periphery do not impacted yet.Quick-fried heap is up to 6.0m.Collapse direction 14 is referring to Fig. 5 and Fig. 6.
5) blasting vibration and the orientation by row contrast of collapsing: adopt directed piecemeal rolling type blasting demolishing method can the building be divided into 6 sections explosions piecemeal; Once neat quick-fried maximum dose Q=40kg; The east side is the protection impact point apart from the residential building of 24m, and the vibration velocity of this house owed by a citizen is V=0.33cm/s.If this engineering adopts directional blasting, the building is divided into the once neat quick-fried maximum dose Q=76 kg of 3 sections explosions, the vibration velocity 0.46cm/s of corresponding house owed by a citizen.The blasting technique that adopting vertically delays time piecemeal combines with directioning falling makes once neat quick-fried maximum dose Q reduce 36kg, and blasting vibration speed has reduced 0.13cm/s in theory.
6) blasting vibration and the orientation by row contrast of collapsing: adopt directed piecemeal rolling type blasting demolishing method; It is to be divided into 6 sections to collapse piecemeal that building collapses; The slump vibration is calculated according to 1/6 of gross mass; Residential building building with nearest east side 24m is an object of protection, is 1.24cm/s at this place's slump vibration data.If this engineering adopts directional blasting, then slump vibration in building body building is calculated according to 1/3 of gross mass, and the slump vibration velocity of residential building is 1.83cm/s.It is thus clear that the blasting technique that adopts vertically time-delay piecemeal to combine with directioning falling makes the building segmentation contact to earth piecemeal, the end vibrations of touching of member are effectively controlled, and the slump vibration velocity has reduced 0.59cm/s in theory.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although the present invention is specified with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. a building blasting demolishing method is characterized in that, may further comprise the steps:
(1) building wall that needs demolition blasting is carried out pre-demolition;
(2) in the building bottom explosion otch is set;
(3) hole in the explosion incision, form the big gun hole;
(4) powder charge in the big gun hole;
(5) will need the building of demolition blasting to be divided into a plurality of zones of detonating, the said regional correspondence of the detonating sequential of detonating according to longitudinal axis, axis of pitch; From back to front longitudinally, along laterally from an end to the other end or two ends to the centre, by the Nonel detonator of delaying time outside the binding hole, zone of detonating, form the blasting circuit of collapsing by the regional orientation of detonating of vertical, horizontal time-delay;
(6) to building protect, line, at last blasting circuit is detonated.
2. mixing building blasting demolishing method according to claim 1 is characterized in that, said explosion otch be shaped as triangle or trapezoidal.
3. mixing building blasting demolishing method according to claim 1 is characterized in that, the Nonel detonator of delaying time outside the hole in the zone of detonating of the same sequential of detonating in the said step (5) adopts and links together the mode of grabbing greatly.
4. a kind of mixing building blasting demolishing method according to claim 1 is characterized in that, is 400～1000ms by the regional time difference of detonating of detonating laterally in the said step (5).
5. a kind of mixing building blasting demolishing method according to claim 1 is characterized in that, is 300～1000ms by the regional time difference of detonating of detonating vertically in the said step (5).
6. a kind of mixing building blasting demolishing method according to claim 1 is characterized in that, the said zone of detonating is the section of detonating.
7. according to right 1 to 6 any described combination construction building blasting demolishing method, it is characterized in that after said building detonated, its mode of collapsing was collapsed for directed rolling type piecemeal.
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Application publication date: 20120704 |