CN207622624U - A kind of initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting - Google Patents

Abstract

The utility model provides a kind of initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting, the initiation net can realize the demolition blasting of more reinforced concrete braces in deep basal pit, multigroup arc pore group is in axial direction embedded in each reinforced concrete brace, one or three arc pores are disposed in each group of arc pore group, the centre position between every two adjacent groups arc pore group is also embedded with two straight tube holes being vertically arranged；One group of arc pore group and adjacent thereafter two straight tube holes in reinforced concrete brace collectively constitute a blasting network connection unit, include multiple blasting network connection units in single steel bar concrete support beam.The utility model by entire demolition blasting initiation net by being decomposed into multiple relatively independent blasting network connection units, in the case where ignition and detonation acts on each blasting network connection unit unidirectionally successively, relay-type, the sequence detonation being delayed greatly, Blasting Vibration Hazards effect, the harm of controlled blasting slungshot can effectively be reduced.

Description

A kind of initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting

Technical field

The utility model is related to Blasting Demolition Technology fields, are supported more particularly, to a kind of deep foundation pit reinforced concrete The initiation net of beam demolition blasting.

Background technology

With the fast development of urban construction, due to various needs such as underground traffic, skyscraper buried depth, Civil Air Defense Facilities, Efficient utilize of the underground space is increasingly taken seriously.In recent years, the construction in Super High house and urban landmark were built The rise built so that city terrestrial reference is bettered a record repeatedly.While highest building in city is bettered a record repeatedly, under complex environment The excavation of Large Foundation Pit, supporting remove to become and build most critical work these landmark buildings early periods, the wherein peace of supporting beam Entirely, efficient dismounting is one of link the most key in process of construction.

Compared with traditional method for dismounting, removing deep foundation pit support system using blasting demolishing method has the efficient, duration The advantages such as short, moderate cost, therefore the blasting demolishing method of reinforced concrete support has been widely used in engineering practice.

However, since the detonation and rock break-off process of explosive are high speed, high pressure and irreversible procedure, blasting procedure removes branch It supports beam and is accompanied by serious blasting vibration and slungshot harm often, to dell base itself, internal semi-finished product and will certainly close on Buildings or structures safety and stability causes damages；Meanwhile huge Property of Blasting Noise can also cause greatly nearby residents and pedestrian It is uncomfortable.Existing supporting beam demolition blasting technique and method are still not yet in effect to solve the problems, such as blasting flyrock and vibrations harm.

Utility model content

The utility model provides a kind of a kind of deep basal pit for overcoming the above problem or solving the above problems at least partly The initiation net of reinforced concrete brace demolition blasting can overcome quick-fried in existing supporting beam demolition blasting technique and method Broken slungshot and vibrations harm problem.

The utility model provides a kind of initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting, the detonation net Network can realize the demolition blasting of more reinforced concrete braces in deep basal pit, and more reinforced concretes are disposed in the deep basal pit Native supporting beam is in axial direction embedded with multigroup arc pore group, each group of curved pipe in each reinforced concrete brace Kong Zuzhong is disposed with one or three arc pores, and the both ends nozzle of every arc pore is upward, and the two of every arc pore End port leaks outside in the upper plane of reinforced concrete brace, and the centre position between every two adjacent groups arc pore group is also It is embedded with two straight tube holes being vertically arranged；

One group of arc pore group and adjacent thereafter two straight tube holes in the reinforced concrete brace collectively constitute One blasting network connection unit, interior single steel bar concrete support beam includes k blasting network connection unit, in single steel bar After the last one blasting network connection unit in concrete support beam, there also is provided m row straight tubes hole, wherein k be more than etc. In 1 integer, m is the integer more than or equal to 0.

The beneficial effects of the utility model are：Connected by the way that single supporting beam is decomposed into multiple relatively independent blasting networks Order member, in the case where ignition and detonation acts on each blasting network connection unit unidirectionally successively, relay-type, the sequence that is delayed greatly rise It is quick-fried, maximum single blow blasting charge can be effectively controlled, Blasting Vibration Hazards effect and the harm of controlled blasting slungshot are reduced.

Based on the above technical solution, the utility model can also improve as follows.

Further, the air line distance l=between each arc pore both ends nozzle in each group of arc pore group 2500~5000mm, per spacing r=0.38H~0.42H between adjacent two arcs pore group, wherein H indicates armored concrete Support depth of beam, unit mm.

Further, the line of centres of the same end pipe mouth of all arc pores in arc pore group described in each group is vertical In the axial direction of reinforced concrete brace；Two straight tube hole lines of centres between two groups of adjacent arc pore groups and reinforcing bar The axial direction of concrete support beam is vertical, each straight tube hole perpendicular to and leakage in the reinforced concrete brace Upper plane, and it is equal at a distance from the upper end tube nozzle in the every straight tube hole arc pore upper end tube nozzle neighbouring with both sides；The m row The quantity in each row straight tube hole in straight tube hole is two or three, and the spacing between every adjacent two row straight tube hole is r/2.

Further, the quantity for the blasting network connection unit for including in each described reinforced concrete brace is k, Wherein,

In formula, L indicates the length of single supporting beam, unit m；

K values round up according to calculated value is taken as natural number；

Air line distances of the l between the nozzle of arc pore both ends, wherein l=2500~5000mm；

R indicates the distance between two adjacent curved pipe groups, r=0.38H~0.42H；

H indicates the height of reinforced concrete brace, unit mm.

Further, each described reinforced concrete brace is equipped with a main line detonator, the main line detonator It is equipped with (k+m+1) a main line Nonel detonator, wherein arranged directly before each blasting network connection unit and each A corresponding main line Nonel detonator is arranged with before pore, be respectively intended to ignite corresponding blasting network connection unit and Corresponding row straight tube hole is ignited, there also is provided a main line Nonel detonator in the tail portion of the main line detonator；

Each arc pore group and adjacent thereafter two straight tube holes are in parallel with main line detonator cluster, form an explosion net Multiple straight tube holes of network connection unit, each row are in parallel with main line detonator cluster, and the K in single steel bar concrete support beam quick-fried Broken network connection unit and the row straight tube holes m are connected in series on the main line detonator；More reinforcing bars in the deep basal pit Concrete support beam forms local support system by way of connecting and parallel connection is combined, and is arranged for the local support system One priming device, for being ignited to all reinforced concrete braces in the local support system.

Further, each arc pore is sequentially equipped with into hole branch detonator, enters hole branch detonator successively Detonator and enter hole branch primacord, it is described enter hole branch primacord on interval be banded with multistage pack, in each straight tube hole according to Secondary sequence is equipped with into hole branch detonator, enters hole branch Nonel detonator and one section of pack, every in each arc pore group One arc pore and adjacent two straight tube holes by it is therein enter hole branch detonator it is in parallel with the main line detonator cluster.

Further, before the reinforced concrete brace demolition blasting, n sections of packs are evenly spaced apart using adhesive tape Binding it is described enter hole branch primacord on, by traction fiber will enter hole branch primacord together with n section packs thereon draw to In arc pore, and the non-charge segment in arc pore both ends is blocked using stemming, then cuts traction fiber；It is described straight One section of pack is housed, wherein inserted with entering hole branch Nonel detonator, one end seal of straight tube hole in the pack in pore It closes, the other end in the straight tube hole is blocked using stemming, wherein n is the integer more than or equal to 1.

Further, the extension time of the main line Nonel detonator is 50~150ms.

Further, when the quantity of arc pore in the arc pore group is three, wherein an arc pore cloth Upper among being placed in reinforced concrete brace, in addition two arc pores are arranged in lower part in reinforced concrete brace In the identical height of both sides, the line of the central point of three curved pipes constitutes isosceles triangle.

Further, when the quantity of arc pore in the arc pore group is one, entering in the arc pore The extension time of hole branch Nonel detonator is 460~650ms；

When the quantity of arc pore in the arc pore group is three, in the arc pore group in reinforced concrete Lower part enters hole branch detonator thunder in two arc pores of both sides arrangement in one of arc pore in native supporting beam The extension time of pipe is 460~550ms, the extension time that hole branch Nonel detonator is entered in another arc pore is 650~ 760ms enters hole branch in arc pore group in reinforced concrete brace in an arc pore of intermediate upper arrangement The extension time of Nonel detonator is 880~1020ms；

The extension time for entering hole branch Nonel detonator in each straight tube hole is 1200~1400ms.

Description of the drawings

In attached drawing, the component names representated by each label are as follows：

Fig. 1 is the utility model single steel bar concrete support beam inner orifice arrangement schematic diagram；

Fig. 2 is the connection relation structure chart of all arc pores and straight tube hole in single steel bar concrete support beam；

Fig. 3 is the arrangement schematic diagram in single arc pore；

Fig. 4 is the arrangement schematic diagram in single straight tube hole；

Fig. 5 is the connection diagram of single blasting network connection unit；

Fig. 6 is a kind of arrangement figure of local support system reinforced concrete brace in deep basal pit；

Fig. 7 is a kind of schematic diagram in the local support system propagation of explosion direction of arrangement in Fig. 6；

Fig. 8 is a kind of schematic diagram of the local support system demolition blasting initiation net of arrangement in Fig. 6；

Fig. 9 is another arrangement figure of local support system reinforced concrete brace in deep basal pit；

Figure 10 is a kind of schematic diagram in the local support system propagation of explosion direction of arrangement in Fig. 9；

Figure 11 is a kind of schematic diagram of the local support system demolition blasting initiation net of arrangement in Fig. 9；

Figure 12 is another arrangement figure of local support system reinforced concrete brace in deep basal pit；

Figure 13 is a kind of schematic diagram in the local support system propagation of explosion direction of arrangement in Figure 12；

Figure 14 is a kind of schematic diagram of the local support system demolition blasting initiation net of arrangement in Figure 12.

In attached drawing, the component names representated by each label are as follows：

1, arc pore, 2, straight tube hole, 3, reinforced concrete brace, 4, enter hole branch detonator, 5, enter hole branch and lead Booster detonator, 6, enter hole branch primacord, 7, pack, 8, stemming, 9, traction fiber, 10, main line detonator, 11, main line leads Booster detonator, 12, blasting network connection unit, 13, priming device.

Specific implementation mode

With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.

Referring to Fig. 1, the deep foundation pit reinforced concrete supporting beam demolition blasting of the utility model one embodiment is provided Initiation net, the demolition blasting to all supporting beams in deep basal pit can be achieved at the same time in the initiation net of the demolition blasting, to depth It, can be in a certain order to each reinforcing bar during all reinforced concrete braces in foundation pit carry out demolition blasting Concrete support beam carries out demolition blasting.

Wherein, more reinforced concrete braces 3, each reinforced concrete brace 3 are disposed in the deep basal pit It is inside in axial direction embedded with multigroup arc pore group, one or three arc pores 1 are disposed in each group of arc pore group, The both ends nozzle of every arc pore 1 is upward, and the both ends port of every arc pore 1 leaks outside in reinforced concrete brace 3 upper plane, the centre position between every two adjacent groups arc pore group are also embedded with two straight tube holes being vertically arranged 2。

One group of arc pore group in the reinforced concrete brace 3 and adjacent thereafter two 2 common groups of straight tube holes At a blasting network connection unit 12.Include k blasting network connection single 12 in single steel bar concrete support beam 3, in list After the last one blasting network connection unit 12 in root reinforced concrete brace 3, m row straight tubes hole there also is provided, wherein K is the integer more than or equal to 1, and m is the integer more than or equal to 0.

Wherein, the air line distance l=2500 between the 1 both ends nozzle of each arc pore in each group of arc pore group~ 5000mm, per spacing r=0.38H~0.42H between adjacent two arcs pore group, wherein H indicates reinforced concrete brace 3 height, unit mm.Wherein, since two straight tube holes 2 are arranged in the centre position between two adjacent groups arc pore group, Therefore, the air line distance of two straight tube holes 2 and the most similar port of adjacent arc pore 1 is r/2.It can be found in Fig. 1, reinforcing bar The distance of corresponding end-faces of first group of arc pore group apart from reinforced concrete brace 3 is r/2 in concrete support beam 3, most Later group arc pore group or a row straight tube hole 2 and the corresponding end-faces distance of reinforced concrete brace 3 are less than or equal to r/2, So that being covered with arc pore group and straight tube hole in entire reinforced concrete supporting beam.

The line of centres of the same end pipe mouth of all arc pores 1 of each group of arc pore group is perpendicular to armored concrete branch Support the axial direction of beam 3, two 2 lines of centres of straight tube hole and reinforced concrete brace between two groups of adjacent arc pore groups 3 axial direction is vertical, each straight tube hole 2 perpendicular to and leakage in the upper plane of the reinforced concrete brace 3, And it is equal at a distance from the upper end tube nozzle in every straight tube hole 21 upper end tube nozzle of arc pore neighbouring with both sides.In m row straight tubes hole 2 The quantity in each row straight tube hole 2 is two or three, and the spacing between every adjacent two row straight tube hole is r/2.

Wherein, the quantity for the blasting network connection unit 12 for including in each reinforced concrete brace 3 is k, wherein

In formula, L indicates the length of single supporting beam, unit m；

K values round up according to calculated value is taken as natural number；

Air line distances of the l between the nozzle of arc pore group both ends, wherein l=2500~5000mm；

R indicates the distance between two adjacent curved pipe groups, r=0.38H~0.42H；

H indicates the height of reinforced concrete brace, unit mm.

It should be noted that since the length of a blasting network connection unit 12 is (l+r/2), single steel bar concrete The length of supporting beam 3 is L, if the last one blasting network connection unit 12 and armored concrete in reinforced concrete brace 3 The distance of the rear end face of supporting beam 3 is less than the length of a blasting network connection unit 12 and is more than r/2, then the last one explosion Straight tube hole 2 is all arranged in this section of space between network connection unit 12 and the rear end face of reinforced concrete brace 3.It can be found in The mode of Fig. 1, arrangement straight tube hole 2 are preferably that first three straight tube holes 2 are arranged as a row, are spaced another row cloth after the distance of r/2 Two straight tube holes 2 are set, repeats to arrange according to three row of straight tube hole 2 one and two row of straight tube hole 2 one successively, ultimately form quincunx Cloth well format, to the last a row straight tube hole 2 and the rear end face distance of reinforced concrete brace 3 are less than or equal to r/2.Wherein, It can also be arranged in such a way that each row arrange two straight tube holes 2 or each row arrange three straight tube holes 2, and unlimited In above-mentioned two straight tube holes of a row, three straight tube holes of another row, 2 spaced apart mode.

Referring to Fig. 2, each reinforced concrete brace 3 is equipped with a main line detonator 10, the main line detonator 10 It is equipped with (k+m+1) a main line Nonel detonator 11, wherein before each blasting network connection unit 12 and each It is arranged with a corresponding main line Nonel detonator 11 before row straight tube hole 2, is respectively intended to ignite corresponding blasting network company Order member 12 and the corresponding row straight tube hole 2 of ignition, on main line, the tail portion of detonator 10 there also is provided a main line detonator thunder Pipe 11.Wherein, main line detonator 10 and all main line Nonel detonators 11 being arranged on are arranged in armored concrete The upper surface of supporting beam 13.

Each arc pore group and adjacent thereafter two straight tube holes 2 are in parallel with 10 cluster of main line detonator, and formation one is quick-fried Network connection unit 12 is broken, is led with main line between multiple straight tube holes 2 of each row after all blasting network connection units 12 10 cluster of booster is in parallel, and the K blasting network connection unit 12 and m row straight tubes hole 2 in single steel bar concrete support beam 3 are in institute It states and is connected in series on main line detonator 10.Wherein, as previously mentioned, the tail portion when reinforced concrete brace 3 includes multiple row straight tube It is in the present embodiment, each to be classified as two straight tube holes 2 or three straight tube holes 2 when hole 2, between multiple straight tube holes 2 of each row In parallel with 10 cluster of main line detonator, for example, the quantity in a certain row straight tube hole is three, then this three straight tube holes 2 are led quick-fried with main line Pipe 10 cluster is in parallel, and multiple row straight tube hole 2 is connected in series on main line detonator 10, for example, there is six row straight tube holes, then this six row straight tube Hole is connected in series on main line detonator 10, reference can be made to Fig. 2.More reinforced concrete braces 3 in the deep basal pit pass through Series connection and the mode in parallel being combined form local support system, arrange a priming device 13 for the local support system, use To be ignited to all reinforced concrete braces 3 in the local support system.

Referring to Fig. 3, be sequentially equipped with successively in each arc pore 1 into hole branch detonator 4, enter hole branch lead it is quick-fried Pipe detonator 5 and enter hole branch primacord 6, it is described enter hole branch primacord 6 on interval be banded with multistage pack 7.Referring to Fig. 4, often It is sequentially equipped with successively in a straight tube hole 2 into hole branch detonator 4, enters hole branch Nonel detonator 5 and one section of pack 7.Referring to Fig. 5, each arc pore 1 and adjacent later two straight tube holes 2 in each arc pore group by it is therein enter hole Branch detonator 4 is in parallel with 10 cluster of main line detonator, forms a blasting network connection unit 12.

Wherein, before 3 demolition blasting of the reinforced concrete brace, n sections of packs 7 are evenly spaced apart to tie up using adhesive tape Prick it is described enter hole branch primacord 6 on, drawn together with n sections pack 7 thereon by traction fiber 9 by hole branch primacord 6 is entered The non-charge segment in 1 both ends of arc pore is blocked to arc pore 1, and using stemming 8, then cuts traction fiber 9. One section of pack 7 is housed, inserted with entering hole branch Nonel detonator 5,2 one end seal of straight tube hole in the pack 7 in the straight tube hole 2 It closes, the other end in straight tube hole 2 is blocked using stemming 8, wherein n is the integer more than or equal to 1.

It should be noted that the support system in reinforced concrete brace composition deep basal pit all in deep basal pit, whole A support system is made of multiple local support systems, each local support system is by more reinforced concrete brace groups At, wherein there are many kinds of the arrangements of local support system, mainly introduces 3 kinds of arrangements below.

The first arrangement, referring to Fig. 6, the reinforced concrete brace in figure is divided into 3 types, wherein marked as ④、⑦、 ③、⑥、WithReinforced concrete brace be known as main support beam, 2., 8., 10. andIt is referred to as secondary Supporting beam, 1., 5., 9. andReferred to as connecting rod, secondary supporting beam therein are used for being fixedly connected with main support beam and connecting rod, formation office Portion's support system.

Referring to Fig. 7, the local support system propagation of explosion direction of arrangement in corresponding diagram 6, for convenience of description, by above-mentioned Fig. 7 In main support beam, secondary supporting beam and connecting rod be referred to as supporting beam.First, by priming device 13 ignite marked as 1., 2., 3. supporting beam, specifically by priming device 13 simultaneously ignite marked as the main line detonator thunder in supporting beam 1., 2., 3. Pipe 11 is drawn in each supporting beam by the main line Nonel detonator 11 being connect with each blasting network connection unit 12 Quick-fried corresponding blasting network connection unit 12.Wherein, it after being ignited marked as supporting beam 1., ignites serial marked as 4. therewith Supporting beam after disconnect, marked as 2. supporting beam ignite after the completion of disconnect, marked as 3. supporting beam ignite after, ignite simultaneously Marked as supporting beam 5. and 6., disconnected after the completion of being ignited marked as supporting beam 6., after being ignited marked as supporting beam 5., together When, ignites in parallel marked as supporting beam 7. and 8., is disconnected after the completion of being ignited marked as supporting beam 7., marked as branch 8. Support beam ignited simultaneously after the completion of igniting it is in parallel marked as 9., 10.,Three supporting beams.The above-mentioned ignition of repetitive cycling Journey, until all reinforced concrete braces ignition in local support system in deep basal pit finishes.Fig. 8 is locally to be propped up in Fig. 6 Support body system demolition blasting initiation net schematic diagram, by can be seen that the ignition of all supporting beams in entire support system is suitable in Fig. 8 Sequence.

Second of arrangement, referring to Fig. 9, the supporting beam in local support system only has main support beam and connecting rod, wherein Marked as being 3., 6., 9., 2., 5., 8. main support beam, marked as being 4. 7. 1. connecting rod, as hereinbefore, retouched to be following It states conveniently, main support beam and connecting rod are referred to as supporting beam.

Figure 10 be Fig. 9 in arrangement local support system propagation of explosion direction, by priming device 13 first ignite marked as 1., supporting beam 2., marked as 1. supporting beam ignite after, ignite connected in series marked as supporting beam 3., label It is disconnected after being ignited for supporting beam 3.；It is ignited simultaneously marked as branch 4. and 5. after being ignited marked as supporting beam 2. Beam is supportted, ignites concatenated marked as supporting beam 6. after being ignited marked as supporting beam 4., draws marked as supporting beam 6. It disconnects, is ignited simultaneously after being ignited marked as supporting beam 5. in parallel marked as supporting beam 7. and 8., so weight after quick-fried Multiple cycle, ignites until all supporting beams in local support system in deep basal pit and finishes.Figure 11 is local support in Fig. 9 System demolition blasting initiation net schematic diagram, by can be seen that the ignition of all supporting beams in entire support system is suitable in Figure 11 Sequence.

The third arrangement is main support beam marked as supporting beam 3., 7., 6. referring to Figure 12, marked as 4., 5., 8. supporting beam be time supporting beam, be connecting rod marked as supporting beam 1..

Figure 13 is the local support system propagation of explosion direction of arrangement in Figure 12, ignites label simultaneously by priming device 13 It for supporting beam 1. and 2., disconnects after being ignited marked as supporting beam 2., draws simultaneously after being ignited marked as supporting beam 1. It is quick-fried in parallel marked as supporting beam 3. and 4., it is disconnected after being ignited marked as supporting beam 3., marked as supporting beam 4. It ignites in parallel marked as supporting beam 5. and 6. after ignition, so moves in circles, until locally being propped up in deep basal pit simultaneously All supporting beams ignition in support body system finishes.Figure 14 is local support system demolition blasting initiation net schematic diagram in Figure 12, By the ignition sequence that can be seen that all supporting beams in entire support system in Figure 14.

Local support in deep basal pit is illustrated above by three kinds of arrangements of reinforced concrete brace in deep basal pit The ignition sequence of the supporting beam of system, the arrangement of local support system and more than three kinds of above-mentioned feelings actually in deep basal pit Shape, but no matter how local support system arranges in deep basal pit, general thought be exactly ignited by the concatenation of supporting beam or And the mode of ignition is connect, supporting beam ignition all in local system in entire deep basal pit is finished.

Wherein, the extension time of main line Nonel detonator 11 is 50~150ms.When arc pore in the arc pore group When 1 quantity is one, the extension time for entering hole branch Nonel detonator 5 in the arc pore 1 is 460~650ms, often The extension time for entering hole branch Nonel detonator 5 in one straight tube hole 2 is 1200~1400ms.When arc in arc pore group When the quantity of pore 1 is three, wherein an arc pore 1 be arranged in reinforced concrete brace 3 it is intermediate upper, in addition Two arc pores 1 are arranged in lower part in reinforced concrete brace 3 in the identical height of both sides, three arc pores 1 The line of central point constitutes isosceles triangle.Both sides cloth is leaned in the lower part in reinforced concrete brace 3 in arc pore group In the two arc pores 1 set, extension time for entering hole branch Nonel detonator 5 in one of arc pore 1 is 460~ 550ms, the extension time that hole branch Nonel detonator 5 is entered in another arc pore 1 are 650~760ms；In arc pore group In reinforced concrete brace 3 in an arc pore 1 of intermediate upper arrangement, enter prolonging for hole branch Nonel detonator 5 Time phase is 880~1020ms.Extension time for entering hole branch Nonel detonator 5 in each straight tube hole 2 is 1200~ 1400ms。

The initiation net of a kind of deep foundation pit reinforced concrete supporting beam demolition blasting provided by the utility model, by that will prop up Support beam demolition blasting initiation net is decomposed into multiple relatively independent blasting network connection units, in the case where an ignition and detonation acts on Each blasting network connection unit unidirectionally successively, relay-type, be delayed greatly sequence detonation, can effectively control maximum single blow blasting charge, drop Low Blasting Vibration Hazards effect.Meanwhile in each blasting network connection unit, enter hole branch using the different delays time Nonel detonator first ignites arc pore group by each curved pipe in the sequential segment detonation arc pore group to get on, get off Inside arc pore on the lower, then ignite arc pore upper in arc pore group, make reinforced concrete brace first under Order above carries out explosion and crushing behind face, can guide the Main way in concrete early damage region and throwing slag explosion To support beam sides, rear quick-fried region becomes first quick-fried throwing slag blanket, can effectively obstruct under shock wave to being thrown off Blasting flyrock, it is ensured that construction safety, and the firing order of the multiple arcs pore in arc pore group meets minimum burden Principle is conducive to improve demolition blasting effect, improves explosive energy effective rate of utilization.Pass through the pre-buried axial direction arc in arc pore group Shape pore simultaneously enters hole branch primacord in hole and significantly reduces the prefabricated quantity of blasthole in supporting beam, reduces explosion consumption Material cost, can be improved economic benefit.

Finally, the present processes are only preferable embodiment, are not intended to limit the scope of protection of the utility model. Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in this reality Within novel protection domain.

Claims (10)

1. a kind of initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting, which is characterized in that cloth in the deep basal pit More reinforced concrete braces (3) are equipped with, multigroup arc is in axial direction embedded in each reinforced concrete brace (3) Shape pore group is disposed with one or three arc pores (1), the both ends of every arc pore (1) in each group of arc pore group Nozzle is upward, and the both ends port of every arc pore (1) leaks outside in the upper plane of reinforced concrete brace (3), every Centre position between two adjacent groups arc pore group is also embedded with two straight tube holes (2) being vertically arranged；

One group of arc pore group in the reinforced concrete brace (3) and adjacent thereafter two common group of straight tube holes (2) Include k blasting network connection unit in single steel bar concrete support beam (3) at a blasting network connection unit (12) (12), after the last one blasting network connection unit (12) in single steel bar concrete support beam (3), it there also is provided m Row straight tube hole, wherein k is the integer more than or equal to 1, and m is the integer more than or equal to 0.

2. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as described in claim 1, which is characterized in that every Air line distance l=2500~5000mm between each arc pore (1) both ends nozzle in one group of arc pore group, per adjacent Spacing r=0.38H~0.42H between two arc pore groups, wherein H indicates that the height of reinforced concrete brace, unit are mm。

3. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as described in claim 1, which is characterized in that every The line of centres of the same end pipe mouth of all arc pores (1) in arc pore group described in one group is perpendicular to reinforced concrete support The axial direction of beam (3)；Two straight tube hole (2) lines of centres between two groups of adjacent arc pore groups and reinforced concrete support The axial direction of beam (3) is vertical, each straight tube hole (2) perpendicular to and leakage in the reinforced concrete brace (3) Upper plane, and it is equal at a distance from the upper end tube nozzle of every straight tube hole (2) arc pore (1) upper end tube nozzle neighbouring with both sides； The quantity in each row straight tube hole (2) in the m row straight tube hole (2) be two or three, per adjacent two row straight tube hole (2) it Between spacing be r/2.

4. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as described in claim 1, which is characterized in that every The quantity for the blasting network connection unit (12) for including in one reinforced concrete brace (3) is k, wherein

In formula, L indicates the length of single supporting beam (3), unit m；

K values round up according to calculated value is taken as natural number；

Air line distances of the l between the nozzle of arc pore (1) both ends, wherein l=2500~5000mm；

R indicates the distance between two adjacent curved pipe groups, r=0.38H~0.42H；

H indicates the height of reinforced concrete brace (3), unit mm.

5. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as described in claim 1, which is characterized in that every One reinforced concrete brace (3) is equipped with a main line detonator (10), and the main line detonator (10) is equipped with (k+ M+1) a main line Nonel detonator (11), wherein arranged directly before each blasting network connection unit (12) and each It is arranged with a corresponding main line Nonel detonator (11) before pore (2), is respectively intended to ignite corresponding blasting network company Order member (12) and the corresponding row straight tube hole (2) of ignition there also is provided one in the tail portion of the main line detonator (10) and do Road Nonel detonator (11)；

Each arc pore group and adjacent thereafter two straight tube holes (2) are in parallel with main line detonator (10) cluster, and formation one is quick-fried Broken network connection unit (12), multiple straight tube holes (2) of each row are in parallel with main line detonator (10) cluster, single steel bar concrete K blasting network connection unit (12) and m row straight tubes hole (2) in supporting beam (3) are gone here and there on the main line detonator (10) Row connection；More reinforced concrete braces (3) in the deep basal pit are connecting and formation office by way of in parallel be combined Portion's support system is arranged a priming device (13) for the local support system, is used for the institute in the local support system There is reinforced concrete brace (3) to be ignited.

6. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as claimed in claim 5, which is characterized in that every It is sequentially equipped with successively into hole branch detonator (4) in a arc pore (1), enters hole branch Nonel detonator (5) and enter Hole branch primacord (6), it is described enter hole branch primacord (6) on interval be banded with multistage pack (7), in each straight tube hole (2) It is sequentially equipped with successively into hole branch detonator (4), enters hole branch Nonel detonator (5) and one section of pack (7), each arc Each arc pore (1) and adjacent two straight tube holes (2) in pore group by it is respective enter hole branch detonator (4) with Main line detonator (10) cluster is in parallel.

7. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as claimed in claim 6, which is characterized in that Before reinforced concrete brace (3) demolition blasting, using adhesive tape by n sections of packs (7) be evenly spaced apart binding it is described enter On hole branch primacord (6), hole branch primacord (6) will be entered by traction fiber (9) and drawn extremely together with n section packs (7) thereon In arc pore (1), and the non-charge segment in arc pore (1) both ends is blocked using stemming (8), then cuts traction Silk (9)；One section of pack (7) is housed, wherein inserted with entering hole branch detonator thunder in the pack (7) in the straight tube hole (2) It manages (5), straight tube hole (2) one end closing, the other end of the straight tube hole (2) is blocked using stemming (8), In, n is the integer more than or equal to 1.

8. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as claimed in claim 6, which is characterized in that institute The extension time for stating main line Nonel detonator (11) is 50~150ms.

9. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as claimed in claim 8, which is characterized in that when When the quantity of arc pore (1) is three in the arc pore group, wherein an arc pore (1) is arranged in armored concrete Intermediate upper in supporting beam (3), in addition two arc pores (1) are arranged in reinforced concrete brace (3) interior lower part and lean on two In the identical height of side, the line of the central point of three curved pipes constitutes isosceles triangle.

10. the initiation net of deep foundation pit reinforced concrete supporting beam demolition blasting as claimed in claim 9, which is characterized in that When the quantity of arc pore (1) in the arc pore group is one, enter hole branch detonator in the arc pore (1) The extension time of detonator (5) is 460~650ms；

When the quantity of arc pore (1) in the arc pore group is three, in the arc pore group in reinforced concrete The interior lower part of native supporting beam (3) enters hole branch in two arc pores (1) of both sides arrangement in one of arc pore (1) The extension time of road Nonel detonator (5) is 460~550ms, enters hole branch Nonel detonator in another arc pore (1) (5) the extension time is 650~760ms, in arc pore group in reinforced concrete brace (3) intermediate upper arrangement In one arc pore (1), the extension time for entering hole branch Nonel detonator (5) is 880~1020ms；

The extension time for entering hole branch Nonel detonator (5) in each straight tube hole (2) is 1200~1400ms.