CN105823386B - The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch - Google Patents
The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch Download PDFInfo
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- CN105823386B CN105823386B CN201610393413.XA CN201610393413A CN105823386B CN 105823386 B CN105823386 B CN 105823386B CN 201610393413 A CN201610393413 A CN 201610393413A CN 105823386 B CN105823386 B CN 105823386B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/02—Arranging blasting cartridges to form an assembly
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Abstract
The present invention relates to a kind of blasting demolishing method of reinforced concrete brace in foundation ditch.Its technical scheme is：PVC curved pipes group (1) pre-buried along the longitudinal direction and vertical straight tube (2) are used as pre-buried blasthole in the reinforced concrete brace (3).In foundation ditch before reinforced concrete brace (3) demolition blasting, n sections of explosive (5) is first equably bound with insulating tape on primacord (4), then is drawn to the relevant position in curved pipe primacord (4) and explosive (5) with traction fiber (7)；Then the two ends of the non-powder charge of curved pipe are blocked with stemming (6), stemming length is more than minimum resistance line length, cuts the traction fiber (7)；The every built-in 1 section of explosive (5) of straight tube (2).Demolition blasting is finally carried out using short-delay blasting.It is good and the characteristics of be widely used that there is the present invention safe and reliable, easy construction, with low cost, explosion to tear effect open, it is adaptable to the demolition blasting of reinforced concrete support structure in all kinds of Large Foundation Pits.
Description
Technical field
The invention belongs to Blasting Demolition Technology field.The explosion of reinforced concrete brace is torn open in specifically related to a kind of foundation ditch
Except method.
Background technology
With the development of building construction technology, various large deep foundation pits increase therewith, reinforced concrete brace in foundation ditch
Dismounting amount gradually increases.At present, in foundation ditch mainly there be reinforced concrete brace method for dismounting：Demolition blasting method, mechanical removal
Method and artificial chisel division.Demolition blasting method compared to latter two method for dismounting, with remove short time limit, slag tap it is fast, recyclable useless
Old reinforcing bar and the characteristics of economize on resources, therefore be most widely used in reinforced concrete brace demolition blasting at present.
Demolition blasting method is typically the vertical blasthole of the pre-buried dense arrangement during casting reinforced concrete support beam, adopts
Taking the form of continuous charging carries out demolition blasting, and this mode needs blasthole extremely many, correspondingly required detonator substantial amounts, very greatly
Blast working cost is increased in degree, while substantial amounts of blast hole projectile filling also substantially increases bursting work quantities, extension
Construction period, reduce blast working speed and efficiency.Additionally due to reinforced concrete brace own dimensions such as hole depth etc.
Limitation, cause single hole explosive payload and stem length smaller, easily cause support beam explosion and crushing and not enough fully or rush big gun
Event occurs, so that needing mechanical secondary broken and increasing and remove cost.
The content of the invention
It is contemplated that overcoming the deficiencies in the prior art, it is therefore an objective to provide a kind of safe and reliable, easy construction, low cost
Blasting demolishing method that is honest and clean, being widely used reinforced concrete brace in the foundation ditch good with demolition blasting effect.
To achieve the above object, what the present invention was adopted the following technical scheme that comprises the concrete steps that：
Step one, pre-buried blasthole
It is pre-buried along the longitudinal direction in the reinforced concrete brace before reinforced concrete brace is poured in the foundation ditch
Have between curved pipe group, curved pipe group apart from r=0.38H~0.42H.The same end pipe mouthful of every curved pipe in curved pipe group
The line of centres is perpendicular to the side long of reinforced concrete brace.The two ends mouth of pipe of every curved pipe is higher by reinforced concrete brace
Air line distance L=1.8~2.3m between upper 40~60mm of plane, the two ends mouth of pipe.
Middle position between adjacent curved pipe group is embedded with 2 straight tubes, and every straight tube is perpendicular to reinforced concrete support
The upper plane of beam, the distance of every straight tube upper end mouth of pipe curved pipe upper end mouth of pipe neighbouring with both sides is equal, every straight tube it is upper
End pipe mouthful is concordant with the two ends mouth of pipe of curved pipe group.
The pre-buried number of the curved pipe group is：A) when the width R of reinforced concrete brace is less than 0.7m, curved pipe exists
It is single arrangement in reinforced concrete brace；B) when the width R of reinforced concrete brace is more than or equal to 0.7m, arc
Pipe is 3 arrangements, the curved pipe mouth of pipe spacing a=0.35R~0.4R of medial arc pipe both sides in reinforced concrete brace.
The powder charge of step 2, curved pipe group
Before reinforced concrete brace demolition blasting in foundation ditch, first n is equably bound with insulating tape on primacord
Section explosive, n is 3~5 natural number.The primacord and the explosive are drawn to the curved pipe with the traction fiber again
Relevant position, then by the two ends of the non-powder charge of curved pipe group with stemming block, stemming length be more than minimum resistance
Line length, cuts the traction fiber.
Every section of explosive payload Q of explosive in curved pipe group1
In formula (i)：Q represents explosive specific charge, kg/m3；
L represents the air line distance between the mouth of pipe of curved pipe two ends, m；
R represents the width of reinforced concrete brace, m；
H represents the height of reinforced concrete brace, m；
N represents the every powder charge hop count of curved pipe, and n is 3~5 natural number；
K represents the radical of curved pipe in curved pipe group, and k is 1 or is 3.
The powder charge of step 3, straight tube
Use the every built-in 1 section of explosive of straight tube, the mode ignited using bottom hole continuous charging, Nonel detonator, straight tube upper end
Stemming is blocked.
The explosive payload Q of straight tube2
In formula (ii)：Q represents explosive specific charge, kg/m3；
R represents the width of reinforced concrete brace, m；
H represents the height of reinforced concrete brace, m；
R represents the distance between curved pipe group, m.
Step 4, demolition blasting
Demolition blasting is carried out using short-delay blasting.
The radius of curvature ρ of the medial arc pipe in the curved pipe group1
The radius of curvature ρ of both sides curved pipe or single curved pipe in curved pipe group2
In formula (iii) and formula (iv)：L represents the air line distance between the mouth of pipe of curved pipe two ends, m；
H represents the height of reinforced concrete brace, m.
Curved pipe material in the curved pipe group is PVC, and the every aperture of curved pipe is 40~50mm.
The lower port of the straight tube is 2H/9~3H/9 with the distance of reinforced concrete brace lower surface；The straight tube
Material is PVC, and the aperture of straight tube is 40~50mm.
The explosive is Φ 32mm emulsions.
The traction fiber is iron wire, one end of traction fiber is penetrated from pre-buried curved pipe one end and is passed from the other end again,
The two ends of traction fiber are exposed to outside the pre-buried curved pipe mouth of pipe.
The length of the primacord is 1.01~1.05 times of curved pipe arc length degree.
The present invention has the advantages that and advantage compared with prior art：
1st, it is safe and reliable.In with the powder charge process of the pre-buried blasthole of pvc pipe, detonator is not used in hole, it is ensured that dress
The safety of medicine process；Charge structure is underground borehole blasting form, armored concrete branch in the pre-buried blasthole of PVC curved pipes simultaneously
The demolition blasting effect for supportting beam can be guaranteed, therefore safe and reliable and demolition blasting effect is good.
2nd, easy construction.PVC curved pipes group pre-buried along the longitudinal direction and vertical straight in reinforced concrete brace of the present invention
Pipe significantly reduces the number of pre-buried blasthole as pre-buried blasthole, simplifies the construction technology of powder charge in pre-buried blasthole and hole, section
The engineering time of powder charge in pre-buried blasthole and hole is saved.
3rd, it is with low cost.The present invention causes the quantity of required detonator to significantly reduce due to significantly reducing blasthole number, saves
About construction cost, while the simplification of construction technology also saves labour cost.
4th, it is widely used.The present invention is applied to the demolition blasting of reinforced concrete brace in all kinds of foundation ditches, therefore applies model
Enclose wide.
Therefore, the present invention has safe and reliable, easy construction, with low cost, demolition blasting effect good and widely used
Feature, it is adaptable to the demolition blasting of reinforced concrete support structure in all kinds of Large Foundation Pits.
Brief description of the drawings
Fig. 1 is a kind of pre-buried blasthole schematic diagram of the invention；
Fig. 2 is the powder charge schematic diagram of the A-A section views of Fig. 1.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, not to its protection domain
Limitation.
In this specific embodiment：The explosive 5 is Φ 32mm emulsions；The traction fiber 7 is iron wire, by traction fiber
7 one end penetrates from pre-buried curved pipe one end and is passed from the other end again, and the two ends of traction fiber are exposed to pre-buried curved pipe pipe
Outside mouthful.
Repeated no more in embodiment.
Embodiment 1
The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch.Armored concrete in foundation ditch described in the present embodiment
The size in the cross section of support beam is：Width R is 0.8m；Height H is 0.6m.
Blasting demolishing method described in the present embodiment is comprised the concrete steps that：
Step one, pre-buried blasthole
Before reinforced concrete brace 3 is poured in the foundation ditch, as shown in Figure 1 and Figure 2, in the reinforced concrete brace 3
Inside be embedded with along the longitudinal direction between curved pipe group 1, curved pipe group 1 apart from r=0.38H~0.42H=(0.38~0.42) ×
0.6m=0.228~0.252m.
Length of the line of centres of the same end pipe mouthful of every curved pipe in curved pipe group 1 perpendicular to reinforced concrete brace
Side；The two ends mouth of pipe of every curved pipe is higher by the air line distance L between plane 40mm on reinforced concrete brace 3, the two ends mouth of pipe
=2m.
Middle position between adjacent curved pipe group 1 is embedded with 2 straight tubes 2, and every straight tube 2 is perpendicular to armored concrete branch
The upper plane of beam 3 is supportted, the distance of every upper end mouth of pipe of straight tube 2 curved pipe upper end mouth of pipe neighbouring with both sides is equal, every straight tube 2
The upper end mouth of pipe it is concordant with the two ends mouth of pipe of curved pipe group 1, be higher by plane 40mm on reinforced concrete brace.
The pre-buried number of the curved pipe group 1 is：Because the width R=0.8m of reinforced concrete brace 3 is more than 0.7m, therefore
Curved pipe is 3 arrangements in reinforced concrete brace 3.
The curved pipe mouth of pipe spacing a=0.35R~0.4R of medial arc pipe both sides
=(0.35~0.4) × 0.8
=0.28~0.32m.
The powder charge of step 2, curved pipe group
Before the demolition blasting of reinforced concrete brace 3 in foundation ditch, first equably bound with insulating tape on primacord 4
3 sections of explosives 5.As shown in Fig. 2 the primacord 4 and the explosive 5 are drawn to the curved pipe with the traction fiber 7 again
Relevant position, then the two ends stemming 6 by the non-powder charge of the curved pipe group 1 block, stemming length is supported more than minimum
Anti- line length, cuts the traction fiber 7.
Every section of explosive payload Q of explosive 5 in curved pipe group 11
In formula (i)：Q represents explosive specific charge, kg/m3；
L represents the air line distance between the mouth of pipe of curved pipe two ends, m；
R represents the width of reinforced concrete brace 3, m；
H represents the height of reinforced concrete brace 3, m；
N represents the every powder charge hop count of curved pipe, and n is 3；
K represents curved pipe radical in curved pipe group 1, and k is 3.
In the present embodiment：Q=1.4kg/m3；L=2m；R=0.8m；H=0.6m；N=3；K=3.
By formula (i), then
Q1=0.149kg.
The powder charge of step 3, straight tube
2 built-in 1 sections of explosives 5 of every straight tube, the mode ignited using bottom hole continuous charging, Nonel detonator, the upper end of straight tube 2
Blocked with stemming 6.
The every explosive payload Q of straight tube 22
In formula (ii)：Q represents explosive specific charge, kg/m3；
R represents the width of reinforced concrete brace 3, m；
H represents the height of reinforced concrete brace 3, m；
R represents the distance between curved pipe group 1, m；
In the present embodiment：Q=1.4kg/m3；R=0.8m；H=0.6m；R=0.24m.
By formula (ii), then
Q2=0.081kg.
Step 4, demolition blasting
Demolition blasting is carried out using short-delay blasting.
In the present embodiment, the radius of curvature ρ of the medial arc pipe in the curved pipe group 11
The radius of curvature ρ of both sides curved pipe or single curved pipe in curved pipe group 12
In formula (iii) and formula (iv)：L represents the air line distance between the mouth of pipe of curved pipe two ends, m；
H represents the height of reinforced concrete brace 3, m.
In the present embodiment：L=2m；H=0.6m.
By formula (iii) and formula (iv), then
ρ1=2.203m；
ρ2=1.450m.
Curved pipe material in curved pipe group 1 described in the present embodiment is PVC, and the every aperture of curved pipe is 40mm.
The lower port of straight tube 2 described in the present embodiment is 2H/9~3H/9 with the distance of the lower surface of reinforced concrete brace 3
=0.6 (2/9~3/9)=0.133~0.20m；The material of the straight tube 2 is PVC, and the aperture of straight tube 2 is 40mm.
The length of primacord 4 described in the present embodiment is 1.01 times of curved pipe arc length degree.
Embodiment 2
The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch.Armored concrete in foundation ditch described in the present embodiment
The size in the cross section of support beam is：Width R is 1m；Height H is 0.8m.
Blasting demolishing method described in the present embodiment is comprised the concrete steps that：
Step one, pre-buried blasthole
Before reinforced concrete brace 3 is poured in the foundation ditch, as depicted in figs. 1 and 2, in the reinforced concrete brace
Be embedded with along the longitudinal direction in 3 between curved pipe group 1, curved pipe group 1 apart from r=0.38H~0.42H=(0.38~0.42) ×
0.8m=0.304~0.306m.
Length of the line of centres of the same end pipe mouthful of every curved pipe in curved pipe group 1 perpendicular to reinforced concrete brace
Side；The two ends mouth of pipe of every curved pipe is higher by the air line distance L between plane 50mm on reinforced concrete brace 3, the two ends mouth of pipe
=2.3m.
Middle position between adjacent curved pipe group 1 is embedded with 2 straight tubes 2, and every straight tube 2 is perpendicular to armored concrete branch
The upper plane of beam 3 is supportted, the distance of every upper end mouth of pipe of straight tube 2 curved pipe upper end mouth of pipe neighbouring with both sides is equal, every straight tube 2
The upper end mouth of pipe it is concordant with the two ends mouth of pipe of curved pipe group 1, be higher by plane 50mm on reinforced concrete brace.
The pre-buried number of the curved pipe group 1 is：Because the width R=1.0m of reinforced concrete brace 3 is more than 0.7m, therefore
Curved pipe is 3 arrangements in reinforced concrete brace 3.
The curved pipe mouth of pipe spacing a=0.35R~0.4R of medial arc pipe both sides
=(0.35~0.4) × 1
=0.35~0.40m.
The powder charge of step 2, curved pipe group
Before the demolition blasting of reinforced concrete brace 3 in foundation ditch, first equably bound with insulating tape on primacord 4
5 sections of explosives 5；The primacord 4 and the explosive 5 are drawn into the relevant position to the curved pipe with the traction fiber 7 again,
Then the two ends stemming 6 by the non-powder charge of the curved pipe group 1 is blocked, and stemming length is more than minimum resistance line length, cuts
The disconnected traction fiber 7.
Every section of explosive payload Q of explosive 5 in curved pipe group 11
In formula (i)：Q represents explosive specific charge, kg/m3；
L represents the air line distance between the mouth of pipe of curved pipe two ends, m；
R represents the width of reinforced concrete brace 3, m；
H represents the height of reinforced concrete brace 3, m；
N represents the every powder charge hop count of curved pipe, and n is 5；
K represents curved pipe radical in curved pipe group 1, and k is 3.
In the present embodiment：Q=1.4kg/m3；L=2.3m；R=m；H=0.8mm；N=5；K=3.
By formula (i), then
Q1=0.172kg.
The powder charge of step 3, straight tube
2 built-in 1 sections of explosives 5 of every straight tube, the mode ignited using bottom hole continuous charging, Nonel detonator, the upper end of straight tube 2
Blocked with stemming 6.
The every explosive payload Q of straight tube 22
In formula (ii)：Q represents explosive specific charge, kg/m3；
R represents the width of reinforced concrete brace 3, m；
H represents the height of reinforced concrete brace 3, m；
R represents the distance between curved pipe group 1, m.
In the present embodiment：Q=1.4kg/m3；R=1m；H=0.8m；R=0.32m.
By formula (ii), then
Q2=0.179kg.
Step 4, demolition blasting
Demolition blasting is carried out using short-delay blasting.
In the present embodiment, the radius of curvature ρ of the medial arc pipe in the curved pipe group 11
The radius of curvature ρ of both sides curved pipe or single curved pipe in curved pipe group 12
In formula (iii) and formula (iv)：L represents the air line distance between the mouth of pipe of curved pipe two ends, m,
H represents the height of reinforced concrete brace 3, m；
In the present embodiment：L=2.3m；H=0.8m.
By formula (iii) and formula (iv), then
ρ1=2.226m；
ρ2=1.506m.
Curved pipe material in curved pipe group 1 described in the present embodiment is PVC, and the every aperture of curved pipe is 50mm.
The lower port of straight tube 2 described in the present embodiment is 2H/9~3H/9 with the distance of the lower surface of reinforced concrete brace 3
=0.8 (2/9~3/9)=0.178~0.267m；The material of the straight tube 2 is PVC, and the aperture of straight tube 2 is 50mm.
The length of primacord 4 described in the present embodiment is 1.03 times of curved pipe arc length degree.
Embodiment 3
The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch.Armored concrete in foundation ditch described in the present embodiment
The size in the cross section of support beam is：Width R is 0.6m；Height H is 0.4m.The tool of the blasting demolishing method described in the present embodiment
Body step is：
Step one, pre-buried blasthole
Before reinforced concrete brace 3 is poured in the foundation ditch, as shown in Figure 1 and Figure 2, in the reinforced concrete brace 3
Inside be embedded with along the longitudinal direction between curved pipe group 1, curved pipe group 1 apart from r=0.38H~0.42H=(0.38~0.42) ×
0.4m=0.152~0.168m.
Length of the line of centres of the same end pipe mouthful of every curved pipe in curved pipe group 1 perpendicular to reinforced concrete brace
Side；The two ends mouth of pipe of every curved pipe is higher by the air line distance L between plane 60mm on reinforced concrete brace 3, the two ends mouth of pipe
=1.8m；
Middle position between adjacent curved pipe group 1 is embedded with 2 straight tubes 2, and every straight tube 2 is perpendicular to armored concrete branch
The upper plane of beam 3 is supportted, the distance of every upper end mouth of pipe of straight tube 2 curved pipe upper end mouth of pipe neighbouring with both sides is equal, every straight tube 2
The upper end mouth of pipe it is concordant with the two ends mouth of pipe of curved pipe group 1, be higher by plane 60mm on reinforced concrete brace；
The pre-buried number of the curved pipe group 1 is：Because the width R=0.6m of reinforced concrete brace 3 is less than 0.7m, therefore
Curved pipe is single arrangement in reinforced concrete brace 3.
The powder charge of step 2, curved pipe group
Before the demolition blasting of reinforced concrete brace 3 in foundation ditch, first equably bound with insulating tape on primacord 4
4 sections of explosives 5；The primacord 4 and the explosive 5 are drawn into the relevant position to the curved pipe with the traction fiber 7 again,
Then the two ends stemming 6 by the non-powder charge of the curved pipe group 1 is blocked, and stemming length is more than minimum resistance line length, cuts
The disconnected traction fiber 7；
Every section of explosive payload Q of explosive 5 in curved pipe group 11
In formula (i)：Q represents explosive specific charge, kg/m3；
L represents the air line distance between the mouth of pipe of curved pipe two ends, mm；
R represents the width of reinforced concrete brace 3, mm；
H represents the height of reinforced concrete brace 3, mm；
N represents the every powder charge hop count of curved pipe, and n is 4,
K represents curved pipe radical in curved pipe group 1, and k is 1.
In the present embodiment：Q=1.4kg/m3；L=1.8m；R=0.6m；H=0.4m；N=3；K=1.
By formula (i), then
Q1=0.151kg.
The powder charge of step 3, straight tube
2 built-in 1 sections of explosives 5 of every straight tube, the mode ignited using bottom hole continuous charging, Nonel detonator, the upper end of straight tube 2
Blocked with stemming 6.
Every section of explosive payload Q of explosive in every straight tube 22
In formula (ii)：Q represents explosive specific charge, kg/m3；
R represents the width of reinforced concrete brace 3, m；,
H represents the height of reinforced concrete brace 3, m；
R represents the distance between curved pipe group 1, m；
In the present embodiment：Q=1.4kg/m3；R=0.6m；H=0.4m；R=10.6m.
By formula (ii), then
Q2=0.027kg.
Step 4, demolition blasting
Demolition blasting is carried out using short-delay blasting.
In the present embodiment, the radius of curvature ρ of single curved pipe in curved pipe group 1
In formula (iii)：L represents the air line distance between the mouth of pipe of curved pipe two ends, m；
H represents the height of reinforced concrete brace 3, m.
In the present embodiment：L=1.8m；H=0.4m.
By formula (iii), then
ρ=1.652m.
Curved pipe material in curved pipe group 1 described in the present embodiment is PVC, and the every aperture of curved pipe is 40mm.
The lower port of straight tube 2 described in the present embodiment is 2H/9~3H/9 with the distance of the lower surface of reinforced concrete brace 3
=0.4 (2/9~3/9)=0.089~0.130m；The material of the straight tube 2 is PVC, and the aperture of straight tube 2 is 40mm.
The length of primacord 4 described in the present embodiment is 1.05 times of curved pipe arc length degree.
This specific embodiment has the advantages that and advantage compared with prior art：
1st, it is safe and reliable.It is safe and reliable.In the powder charge process of the pre-buried blasthole of pvc pipe, detonator is not used in hole, it is ensured that
The safety of powder charge process；Charge structure is underground borehole blasting form, reinforced concrete in the pre-buried blasthole of PVC curved pipes simultaneously
The demolition blasting effect of native support beam can be guaranteed, therefore safe and reliable and demolition blasting effect is good.
2nd, easy construction.PVC curved pipes group 1 pre-buried along the longitudinal direction and vertical in reinforced concrete brace of the present invention 3
Straight tube 2 significantly reduces the number of pre-buried blasthole as pre-buried blasthole, simplifies the construction work of powder charge in pre-buried blasthole and hole
Skill, saves the engineering time of powder charge in pre-buried blasthole and hole.
3rd, it is with low cost.This specific embodiment causes the quantity of required detonator bright due to significantly reducing blasthole number
It is aobvious to reduce, construction cost is saved, while the simplification of construction technology also saves labour cost.
4th, it is widely used.This specific embodiment is applied to the demolition blasting of reinforced concrete brace in all kinds of foundation ditches,
Therefore have a wide range of application.
Therefore, this specific embodiment has safe and reliable, easy construction, with low cost, demolition blasting effect good and should
The characteristics of using extensive, it is adaptable to the demolition blasting of reinforced concrete support structure in all kinds of Large Foundation Pits.
Claims (7)
1. in a kind of foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that the blasting demolishing method is：
Step one, pre-buried blasthole
It is pre- along the longitudinal direction in the reinforced concrete brace (3) before reinforced concrete brace (3) is poured in the foundation ditch
Be embedded between curved pipe group (1), curved pipe group (1) apart from r=0.38H~0.42H；Every curved pipe in curved pipe group (1)
Same end pipe mouthful the line of centres perpendicular to the side long of reinforced concrete brace (3)；The two ends mouth of pipe of every curved pipe is higher by
Air line distance L=1.8~2.3m between 40~60mm of plane on reinforced concrete brace (3), the two ends mouth of pipe；
Middle position between adjacent curved pipe group (1) is embedded with 2 straight tubes (2), and every straight tube (2) is perpendicular to armored concrete
The upper plane of support beam (3), the distance of every straight tube (2) upper end mouth of pipe curved pipe upper end mouth of pipe neighbouring with both sides is equal, often
The upper end mouth of pipe of root straight tube (2) is concordant with the two ends mouth of pipe of curved pipe group (1)；
The pre-buried number of the curved pipe group (1) is：A) when the width R of reinforced concrete brace (3) is less than 0.7m, curved pipe
It is single arrangement in reinforced concrete brace (3)；B) when the width R of reinforced concrete brace (3) is more than or equal to
During 0.7m, curved pipe is 3 arrangements, the curved pipe mouth of pipe spacing a of medial arc pipe both sides in reinforced concrete brace (3)
=0.35R~0.4R；
The powder charge of step 2, curved pipe group (1)
In foundation ditch before reinforced concrete brace (3) demolition blasting, first equably bound with insulating tape on primacord (4)
N sections of explosive (5), n is 3~5 natural number；The primacord (4) and the explosive (5) are drawn to institute with traction fiber (7) again
The relevant position in curved pipe is stated, then the two ends of the non-powder charge of the curved pipe group (1) are blocked with stemming (6), blocked
Length is more than minimum resistance line length, cuts the traction fiber (7)；
Every section of explosive payload Q of explosive (5) in curved pipe group (1)1
In formula (i)：Q represents explosive specific charge, kg/m3,
L represents the air line distance between the mouth of pipe of curved pipe two ends, m,
R represents the width of reinforced concrete brace (3), m,
H represents the height of reinforced concrete brace (3), m,
N represents the every powder charge hop count of curved pipe, and n is 3~5 natural number,
K represents the radical of curved pipe in curved pipe group (1), and k is 1 or is 3；
The powder charge of step 3, straight tube (2)
The every built-in 1 section of explosive (5) of straight tube (2), the mode ignited using bottom hole continuous charging, Nonel detonator, straight tube (2)
Upper end is blocked with stemming (6)；
The every explosive payload Q of straight tube (2)2
In formula (ii)：Q represents explosive specific charge, kg/m3,
R represents the width of reinforced concrete brace (3), m,
H represents the height of reinforced concrete brace (3), m,
R represents the distance between curved pipe group (1), m；
Step 4, demolition blasting
Demolition blasting is carried out using short-delay blasting.
2. according to claim 1 in foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that the arc
The radius of curvature ρ of the medial arc pipe in shape pipe group (1)1
The radius of curvature ρ of both sides curved pipe or single curved pipe in curved pipe group (1)2
In formula (iii) and formula (iv)：L represents the air line distance between the mouth of pipe of curved pipe two ends, m,
H represents the height of reinforced concrete brace (3), m.
3. according to claim 1 in foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that the arc
Curved pipe material in shape pipe group (1) is PVC, and the every aperture of curved pipe is 40~50mm.
4. according to claim 1 in foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that it is described straight
The distance of the lower port and reinforced concrete brace (3) lower surface of managing (2) is 2H/9~3H/9；The material of the straight tube (2)
It is PVC, the aperture of straight tube (2) is 40~50mm.
5. according to claim 1 in foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that it is described fried
Medicine (5) is Φ 32mm emulsions.
6. according to claim 1 in foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that it is described to lead
It is iron wire to draw silk (7), one end of traction fiber (7) is penetrated from pre-buried curved pipe one end and is passed from the other end again, traction fiber (7)
Two ends be exposed to outside the pre-buried curved pipe mouth of pipe.
7. according to claim 1 in foundation ditch reinforced concrete brace blasting demolishing method, it is characterised in that it is described to lead
The length of quick-fried rope (4) is 1.01~1.05 times of curved pipe arc length degree.
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| CN201610393413.XA CN105823386B (en) | 2016-06-03 | 2016-06-03 | The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610393413.XA CN105823386B (en) | 2016-06-03 | 2016-06-03 | The blasting demolishing method of reinforced concrete brace in a kind of foundation ditch |
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| CN105823386A CN105823386A (en) | 2016-08-03 |
| CN105823386B true CN105823386B (en) | 2017-06-09 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592602B (en) * | 2016-12-16 | 2018-07-03 | 武汉科技大学 | For the pre-groove to be blasted for removing deep foundation pit reinforced concrete supporting beam |
| CN106759526B (en) * | 2016-12-16 | 2018-10-26 | 武汉科技大学 | A kind of purlin before Brace in Deep Footing Groove beam demolition blasting protects preprocess method |
| CN106592604B (en) * | 2017-01-04 | 2018-06-19 | 武汉科技大学 | Fender post reserves the determining method of protective layer optimum thickness in deep basal pit blast working |
| CN107843160B (en) * | 2017-12-01 | 2024-04-12 | 武汉科技大学 | Detonating network for blasting demolition of reinforced concrete support beam of deep foundation pit |
| CN108759600B (en) * | 2018-05-24 | 2023-05-26 | 中钢集团武汉安全环保研究院有限公司 | Method for blasting demolishing angle steel structure of prefabricated water medium module |
| CN108731566B (en) * | 2018-05-24 | 2023-04-28 | 中钢集团武汉安全环保研究院有限公司 | Method for blasting demolishing angle steel structure of prefabricated granular medium module |
| CN108731567B (en) * | 2018-05-24 | 2023-05-09 | 中钢集团武汉安全环保研究院有限公司 | Method for blasting demolishing angle steel structure of precast concrete integral module |
| CN108731564B (en) * | 2018-05-24 | 2023-04-28 | 中钢集团武汉安全环保研究院有限公司 | Method for blasting demolishing angle steel structure of precast concrete split module |
| CN112665474A (en) * | 2020-12-22 | 2021-04-16 | 武汉爆破有限公司 | Green construction process for horizontal concrete supporting structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203687791U (en) * | 2014-01-03 | 2014-07-02 | 谭华 | Novel blasting embedded pipe |
| CN104964624B (en) * | 2015-07-01 | 2018-05-22 | 湖北工业大学 | Reinforced beam axially pre-buried blasthole and demolition blasting method |
| CN104964623B (en) * | 2015-07-01 | 2017-01-11 | 叶建军 | Large-area or large-volume concrete pre-buried blast hole arrangement method and blasting demolition method |
| CN105571418B (en) * | 2016-02-23 | 2018-01-16 | 程大春 | Reinforced beam or post water coupling blasting demolishing method |
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