CN105926641A - Subtle preprocessing construction process of decomposed rock of underground continuous wall - Google Patents
Subtle preprocessing construction process of decomposed rock of underground continuous wall Download PDFInfo
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- CN105926641A CN105926641A CN201610274757.9A CN201610274757A CN105926641A CN 105926641 A CN105926641 A CN 105926641A CN 201610274757 A CN201610274757 A CN 201610274757A CN 105926641 A CN105926641 A CN 105926641A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
Abstract
The invention discloses a subtle preprocessing construction process of decomposed rock of an underground continuous wall. The subtle preprocessing construction process of the decomposed rock of the underground continuous wall includes pile punching construction. The construction process further includes blasting treatment which is completed before pile punching construction. The construction process specifically includes the following steps that firstly, the position of the continuous wall is determined in a pay-off manner, and amplitude selection is performed; secondly, a geological drilling rig is adopted for drilling blasting holes; thirdly, powder charging is performed for blasting treatment; and fourthly, a pile punching machine is adopted for groove punching construction till the holes are formed. According to the subtle preprocessing construction process of the decomposed rock of the underground continuous wall, by means of the underground continuous wall presplitting blasting processing technology performed in the manner that the micro difference control blasting technology through which hole-inside segmentation and hole-outside delay are performed is combined with a water pressure blasting principle, the construction problem that grooving of hard rock of the underground continuous wall is difficult is successfully solved, the engineering cost is saved, and the construction progress is accelerated.
Description
Technical field
The present invention relates to the realm of building construction, particularly to diaphram wall decomposed rock pretreatment construction technology in a subtle way.
Background technology
Along with increasingly sharpening of urban transportation, subway is approved by everybody with the biggest flow means of transportation, in subway work, diaphram wall is high with self-strength, stagnant water effect is good, building enclosure application is the most universal, but being limited by construction, in rock stratum, in the most micro-weathered rock formation, construction speed is slow, employing is rushed the pile driving construction oblique rock of chance and inclined hole phenomenon is easily occurred, thus cause and invade limit, card cage, construction quality, construction period are difficult to ensure that.Before construction of diaphragm wall, rock stratum is carried out pretreatment, there is good promotion prospect and promotional value.
The most both at home and abroad when the micro-decomposed rock of construction of diaphragm wall, mainly use slotter, rush pile driving construction, but slotter is poor for more than intensity 50MPa micro-decomposed rock effect.Rushing pile driving construction and be applicable to micro-decomposed rock, but construction efficiency is difficult to ensure that, inclined hole phenomenon easily occurs when meeting oblique rock, construction quality is difficult to ensure that.
Summary of the invention
The technical problem to be solved is to provide a kind of diaphram wall decomposed rock pretreatment construction technology in a subtle way, which overcomes the disadvantages mentioned above of prior art.
The technical problem to be solved is achieved through the following technical solutions:
A kind of diaphram wall decomposed rock pretreatment construction technology in a subtle way, including rushing pile driving construction, described construction technology also includes: explosion treatment, and described explosion treatment completes before rushing pile driving construction.
Preferably, in technique scheme, described construction technology specifically includes following steps:
1) unwrapping wire determines diaphragm wall position and carries out framing；
2) geological drilling rig is used to bore blast hole；
3) powder charge carries out explosion treatment；
4) use rush stake machine carry out jet-bedding construct to pore-forming.
Preferably, in technique scheme, described step 2) comprise the following steps:
Use vertical drilling form centering air slaking, light weathered granite layer to hole, in boring, install PVC sleeve pipe after having holed, at the bottom of sleeve pipe, be equipped with plug, before explosion, hide aperture to prevent foreign body from falling into blocking big gun hole.
Preferably, in technique scheme, described step 3) comprise the following steps:
Charge constitution is set: explosion groove section is arranged two row two artillery salvo holes, in blossom type cloth hole, leads outline within the walls, wherein, centre bore one row along diaphragm wall, arrange along diaphragm wall center line；
Powder charge: during the explosion of rock stratum, when single hole monomer explosion, loaded length is identical with rock thickness, and during porous monolithic explosion, each hole bottom hole pitch is bottom bottom surface, rock stratum 10-15cm, powder charge to big gun hole, and rock stratum end face stays 10-15cm not powder charge, preferably 10cm；
Arranging initiation net: big gun hole uses forward powder charge to detonate, detonate selection non-electrical blasting network, uses and excites pin to detonate, and each big gun hole fills two detonators, and is belonging respectively to two blasting networks, detonates after two set networking parallel connections.
Preferably, in technique scheme, when carrying out explosion, a drain hole will be drilled with at adjacent ground-connecting-wall seam 30-60cm, as damping distance piece.Described emptying aperture is preferably 3.
Preferably, in technique scheme, described step 3) powder charge process, specifically include following steps:
Processing medicated bag: according to drilling parameter and situation of verifying, calculate the length of medicated bag, will aoxidize explosive and double detonator of sending out loads in pvc pipe, formation single hop medicated bag or segmentation medicated bag；
The installation of medicated bag is fixed: after medicated bag processes, and in tube wall upper end drill two holes, binds with iron wire, above tether rope, then start lower medicated bag, after medicated bag is in place, with iron wire, rope be fixed on casing wall；
Blocking: medicated bag in place and fixing after, inside and outside sleeve pipe all with stemming blocking closely knit, prevent the projection of sleeve pipe.
Preferably, in technique scheme, every separate explosion groove segment length of described diaphram wall is less than or equal to 6.0m, and width is the one-tenth hole width 0.80m of diaphram wall.
Preferably, in technique scheme, in described big gun hole, Millisecond Nonel Tube Detonator selected by detonator；Detonating capsule selects detonator；No. 2 rock emulsion explosives selected by explosive.
Preferably, in technique scheme, described medicated bag also includes filling coarse sand, mud and electricity block；Described single hop medicated bag is followed successively by electricity block, mud, filling coarse sand, oxidation explosive, double electric detonator from top to bottom；Described segmentation medicated bag arranges space between described oxidation explosive, thus will oxidation explosive segmentation.
Preferably, in technique scheme, described construction technology is further comprising the steps of:
(5) clear hole；
(6) steel reinforcement cage processing lifting；
(7) concreting；
(8) joint processes.
Technique scheme of the present invention, has the advantages that
1, the mode using broken charges, the Millisecond Controlled Blasting technology of hole male extension to combine hydraulic pressure demolition principle carries out ground-connecting-wall presplit blasting treatment technology, successfully solve ground-connecting-wall and enter the construction difficult problem that hard rock grooving is difficult, save engineering cost, accelerate construction speed.
2, in the range of diaphram wall micro-decomposed rock use underwater demolition pretreatment can the effectively save construction period, use before pretreatment and rush the average daily micro-weathered layer punching 0.2m of pile driving construction single hole, use the average daily micro-weathered layer punching 1.2m of single hole after pretreatment.
Accompanying drawing explanation
Fig. 1 is the initiation net layout drawing of the present invention.
Fig. 2 is the diaphram wall blast charging structural representation of the present invention.
Fig. 3 A is the diaphram wall explosion cloth hole floor map that the adjacent continuous wall of the present invention is explosion section.
Fig. 3 B is that the adjacent continuous wall of the present invention is non-explosion section diaphram wall explosion cloth hole floor map.
Fig. 4 is the single hop cartridging schematic diagram of the present invention.
Fig. 5 is the segmentation cartridging schematic diagram of the present invention.
Fig. 6 is the blasting protection schematic diagram of the present invention.
Wherein: 1-big gun hole (powder charge hole), 2-detonator, 3-explosive, 4-stemming, 5-emptying aperture, 6-electricity block, 7-mud, 8-fills coarse sand, and 9-aoxidizes explosive, the double electric detonator of 10-, 11-space, 12-sand pocket (weight, steel plate).
Detailed description of the invention
Below the detailed description of the invention of the present invention is described in detail, in order to be further appreciated by the present invention.
The present invention is diaphram wall, owing to geological condition limits, diaphram wall need to embed micro-decomposed rock, due to this bid section early stage by new eastern station erect-position adjustment affected, on-stream time is delayed, can the construction of this bid section become this circuit and be open to traffic key factor on time, conventional diaphram wall weathered rock formation in a subtle way uses and rushes pile driving construction, but it is relatively low to rush pile driving construction work efficiency, it is difficult to ensure that owner requires that the duration plans, for ensureing that owner's duration plans, need rock stratum is carried out underwater demolition pretreatment before construction of diaphragm wall.
Diaphram wall is generally divided into pile-column structure and groove segmentation structure.The present invention is groove segmentation diaphram wall, owing to continuous wall embedding light weathered granite layer is more, therefore use the form of explosion that rock stratum in the range of diaphragm wall carries out pretreatment before construction of diaphragm wall, thus reduce the globality of micro-weathered rock formation, use after explosion treatment and rush pile driving construction.Its master operation is: unwrapping wire determines diaphragm wall position and carries out framing；Geological drilling rig is used to bore blast hole；Powder charge carries out explosion and reaches presplitting effect；Employing is rushed stake machine and is carried out jet-bedding construction to pore-forming；Clear hole；Steel reinforcement cage processing lifting；Concreting；Joint processes.Find that diaphragm wall can effectively improve after explosion treatment and rushes stake efficiency by relative analysis, reduce inclined hole, invade the generation of limit situation, save the duration.
A kind of diaphragm wall decomposed rock pretreatment construction technology in a subtle way, comprises the following steps:
1, elementary errors presplitting controlled blasting relevant parameter is used to determine
Controlled blasting principle: for the groove section of air slaking light weathered granite in air slaking in entering, light weathered granite or existence, the method centering air slaking of surface drilling, light weathered granite layer is used to hole, utilize " presplit blasting+tight-face blasting " mechanism of action, science cloth hole, the energy that Appropriate application blast produces in diaphram wall, mild wind part rock acts on, in order to reach the purpose making overall slightly weathered rock rupture, be divided into bulk.During bursting work, explosive 3 unit consumption controls at about 2.0kg/m3.Need to carry out a groove section examination during blast working quick-fried, then carry out loosing core between hole sampling to explosion groove section, adjusts blasting parameter in time according to the broken situation of rock of loosing core.
(1) bore diameter
Using geological drilling rig boring (using if desired with pipe rig), soil layer boring aperture, rock-boring aperture are 90mm, install the PVC sleeve pipe of diameter 75mm in boring.
(2) boring form
For the ease of construction and accurate keyhole direction, use vertical drilling form.With mud guard aperture in boring procedure, descend steel bushing if desired.After pore-forming, the PVC sleeve pipe guard aperture of lower 75mm, need to be equipped with plug at the bottom of sleeve pipe, and the front aperture of explosion needs to hide, and prevents foreign body from falling into blocking big gun hole 1.
(3) explosion groove segment length, width
Diaphram wall every separate explosion groove segment length controls within 6.0m.Width is the one-tenth hole width 0.80m of diaphram wall.
(4) firer's resource supportability
Millisecond Nonel Tube Detonator selected by detonator 2 in hole, and detonating capsule selects detonator, and 2# rock emulsion explosive selected by explosive 3, and normal diameter is Φ 60mm, and water resistance is preferable, needs processing with specific reference to on-the-spot.
(5) charge constitution and layout initiation net
Each groove section arranges two row two artillery salvo holes 1, blossom type cloth hole, leads outline within the walls along diaphragm wall, and pitch-row is 0.65m, wherein centre bore one row, arranges along diaphragm wall center line, and 6m groove section holes 17 altogether.Owing to there being subsoil water above detonating material, hydraulic pressure is relatively big, and therefore detonating material needs counterweight anti-floating.Big gun hole 1 uses forward powder charge to detonate, and detonate selection non-electrical blasting network, uses and excites pin to detonate, and each big gun hole 1 fills two detonators 2, and is belonging respectively to two blasting networks, detonates after two set networking parallel connections, and to guarantee initiation net safety, networking schematic diagram is as shown in Figure 1.
2, explosion dosage determines
Owing to the rock position of this requirement of engineering explosion treatment is relatively deep, and blast working under water.The particularity of incorporation engineering and existing plant equipment and technical force, determine to use geological drilling rig to carry out hole (using if desired with pipe rig).
According to the method for designing of Sweden, unit powder consumption calculates:
Q=q1+q2+q3+q4
Wherein, q1-base charge, is the twice (this engineering explosion object located underground 15～about 22m, and there is subsoil water, therefore be considered as underwater demolition) of general land heading blast.Underwater vertical is holed, is further added by 10%.The deep hole blasting average quantity used in unit volume blasted q1=1.0kg/m3, then underwater drilling q1=2.0kg/m3, underwater vertical hole q1=2.2kg/m3 of such as common solid rock；
Hydraulic pressure increment above the quick-fried district of q2-, q2=0.01h2；
The h2-depth of water, m, take 17m；
Cover layer increment above the quick-fried district of q3-, q3=0.02h3；
H3-cover layer (mud or soil, sand) thickness, 11m；
Q4-rock expansion increment, q4=0.03h；
H-rise of flight, 9m.
This engineering h=9m, h2 averagely take 17m, h3=11m；
Q1=1.1kg/m3
Q=2.2+0.01 × 17+0.02 × 11+0.03 × 9=2.86kg/m3.
It is 2.82kg/m according to " marine traffic engineering blasting technique specification " (JTS204-2008) decomposed rock underwater drilling and blasting unit consumption empirical value3, in bursting work process first according to unit consumption 2.82kg/m3Try quick-fried after, adjust blasting parameter in light of the circumstances.
3, cloth well format and charge constitution
Because depth of stratum is uneven, it is contemplated that the error (deviation accumulation must not exceed 10cm) measured and produce in medicated bag hoisting process, and in order to prevent explosion from affecting the overlying soil body and diaphragm wall substrate rock stratum, therefore during the explosion of rock stratum, when single hole monomer explosion, loaded length is identical with rock thickness, during porous monolithic explosion, each hole bottom hole pitch is from bottom surface, rock stratum 10cm, powder charge is to bottom big gun hole 1, rock stratum end face stays 10cm not powder charge, and diaphram wall blast charging structural representation is as shown in Figure 2.Additionally, in order to ensure adjacent molding diaphram wall in blasting process unaffected, when carrying out explosion, a drain hole 5 will be drilled with at adjacent ground-connecting-wall seam 50cm as damping distance piece, this emptying aperture is preferably 3.Concrete arrangement form is as shown in Figure 3.
4, medicated bag processing
After the acceptance(check) of big gun hole 1, warning is set in the range of the quick-fried district of powder charge, starts to process medicated bag.First have to be ready to the pvc pipe of diameter 75mm, the drilling parameter provided according to boring team and situation of verifying, calculate cartridge length in advance, the position specified in explosive 3 and detonator 2 are loaded pvc pipe.Owing to having water and a small amount of mud in hole, for smooth powder charge, need to counterweight suitable to medicated bag.The length of pvc pipe need to intercept according to cartridge length and counterweight length.Cartridging schematic diagram is as shown in Fig. 4 and Fig. 5.Single hop medicated bag is followed successively by electricity block 6, mud 7 from top to bottom, fills coarse sand 8, oxidation explosive 9, double electric detonator 10；Segmentation medicated bag arranges space 11 between described oxidation explosive, thus will oxidation explosive segmentation.
L=L1i+L2i
In formula: L-taken pvc pipe length；L1i-cartridge length；L2i-filling and counterweight length.
5, medicated bag security protection in place
After medicated bag processes, bore holes in tube wall upper end, bind with iron wire, upper tether rope, then start lower medicated bag.The drilling parameter that theres is provided according to boring team and verify situation, determines powder charging bottom degree of depth N1, the most accurately measures length sum N2 of pvc pipe and rope, make N1=N2, is suspended in midair by whole medicated bag accurately on position, and error control is within+10cm.After medicated bag is in place, with iron wire, rope is fixed on casing wall so that it is no longer move.
Medicated bag in place and fixing after, proceed by blocking.Forbid to use medicated bag in ironware impact big gun hole 1, detonator 2.All block closely knit with stemming 4 inside and outside sleeve pipe, prevent the projection of sleeve pipe.Underground explosion does not have slungshot and produces, and the high pressure gas only produced after explosion is known from experience outside the mud extrusion hole in big gun hole 1, and in order to prevent the mud gushed out from splashing, protection system is taked to combine as follows, as shown in Figure 6 in side, land.If having been carried out bursting work around this quick-fried district, then need hole residual to explosion about sand pocket (weight, steel plate) 12 to cover, prevent mud from spraying.
6, effect after presplitting controlled blasting
Before construction of diaphragm wall, by the way of underwater demolition, rock stratum in the range of diaphragm wall is carried out explosion, after explosion, can effectively reduce micro-weathered rock formation globality, blast working uses after completing and rushes pile driving construction, can improve and rush stake efficiency, save the duration, and the later stage rushes the pile driving construction stage and is effectively reduced inclined hole, invades the generation of limit situation.
The successful Application of technique scheme of the present invention, achieves good economic and social benefit.Diaphram wall decomposed rock in a subtle way is constructed, the construction experience that can use for reference is little, pass through technological innovation, successfully overcome diaphram wall construction speed shortcoming slowly in micro-weathered rock formation, solid foundation has been laid for the construction of diaphram wall decomposed rock in a subtle way, the time striven for for follow-up earthwork evacuation and anchor cable construction, smoothly completing of engineering has been gained most valuable experience for the application of urban track traffic construction of diaphragm wall from now on.
Along with developing rapidly of China's urban construction cause, urbanization process is accelerated, urban population high concentration, and traffic above-ground is crowded, and subway will become the important vehicles of people's trip.The feature that diaphram wall is good with stagnant water effect, self-strength is high as subway station building enclosure, more and more by everybody cognition, but limited by construction machinery and geological conditions, construction speed, difficult quality guarantee in decomposed rock in a subtle way, by using this construction technology, while ensureing construction speed, construction cost can be substantially reduced, the construction experience of similar engineering is have accumulated for enterprise, enhance the technological reserve of enterprise, can provide construction of diaphragm wall under conditions of similarity and instruct and use for reference, this construction method has preferable promotion and application and is worth.
Although the present invention is open as above with embodiment; so it is not intended to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; all can make various different selection and amendment, therefore protection scope of the present invention is limited by claims and equivalents thereof.
Claims (10)
1. a diaphram wall decomposed rock pretreatment construction technology in a subtle way, including rushing pile driving construction, its feature
Being, described construction technology also includes: explosion treatment, and described explosion treatment completes before rushing pile driving construction.
Diaphram wall the most according to claim 1 decomposed rock pretreatment construction technology in a subtle way, it is special
Levying and be, described construction technology specifically includes following steps:
1) unwrapping wire determines diaphragm wall position and carries out framing；
2) geological drilling rig is used to bore blast hole；
3) powder charge carries out explosion treatment；
4) use rush stake machine carry out jet-bedding construct to pore-forming.
Diaphram wall the most according to claim 2 decomposed rock pretreatment construction technology in a subtle way, it is special
Levy and be, described step 2) comprise the following steps:
Use vertical drilling form centering air slaking, light weathered granite layer to hole, after having holed
Install PVC sleeve pipe in boring, at the bottom of sleeve pipe, be equipped with plug, before explosion, hide aperture to prevent foreign body from falling into
Blocking big gun hole.
Diaphram wall the most according to claim 2 decomposed rock pretreatment construction technology in a subtle way, it is special
Levy and be, described step 3) comprise the following steps:
Charge constitution is set: explosion groove section is arranged two row two artillery salvo holes, in blossom type cloth hole, along continuously
Wall leads outline within the walls, wherein, centre bore one row, arranges along diaphragm wall center line；
Powder charge: during the explosion of rock stratum, when single hole monomer explosion, loaded length is identical with rock thickness, porous
During monomer explosion, each hole bottom hole pitch bottom bottom surface, rock stratum 10-15cm, powder charge to big gun hole, rock stratum end face
Stay 10-15cm not powder charge；
Arranging initiation net: big gun hole uses forward powder charge to detonate, detonate selection non-electrical blasting network, uses
Exciting pin to detonate, each big gun hole fills two detonators, and is belonging respectively to two blasting networks, and two set networkings are also
Detonate after connection.
Diaphram wall the most according to claim 4 decomposed rock pretreatment construction technology in a subtle way, it is special
Levy and be, when carrying out explosion, a drain hole will be drilled with at adjacent ground-connecting-wall seam 30-60cm,
As damping distance piece.
Diaphram wall the most according to claim 4 decomposed rock pretreatment construction technology in a subtle way, it is special
Levy and be, described step 3) powder charge process, specifically include following steps:
Processing medicated bag: according to drilling parameter with verify situation, calculates the length of medicated bag, will oxidation explosive and
Double detonators load in pvc pipe, form single hop medicated bag or segmentation medicated bag；
The installation of medicated bag is fixed: after medicated bag processes, and in tube wall upper end drill two holes, binds with iron wire,
Tether rope above, then starts lower medicated bag, after medicated bag is in place, with iron wire, rope is fixed on casing wall；
Blocking: medicated bag in place and fixing after, inside and outside sleeve pipe all with stemming blocking closely knit, prevent sleeve pipe
Projection.
Diaphram wall the most according to claim 4 decomposed rock pretreatment construction technology in a subtle way, it is special
Levying and be, every separate explosion groove segment length of described diaphram wall is less than or equal to 6.0m, and width is that underground connects
The one-tenth hole width 0.80m of continuous wall.
Diaphram wall the most according to claim 4 decomposed rock pretreatment construction technology in a subtle way, it is special
Levying and be, in described big gun hole, Millisecond Nonel Tube Detonator selected by detonator；Detonating capsule selects detonator；Explosive
Select No. 2 rock emulsion explosives.
Diaphram wall the most according to claim 4 decomposed rock pretreatment construction technology in a subtle way, it is special
Levying and be, described medicated bag also includes filling coarse sand, mud and electricity block；Described single hop medicated bag is from top to bottom
It is followed successively by electricity block, mud, filling coarse sand, oxidation explosive, double electric detonator；Described segmentation medicated bag is in institute
State and space is set between oxidation explosive, thus will oxidation explosive segmentation.
Diaphram wall the most according to claim 1 decomposed rock pretreatment construction technology in a subtle way, it is special
Levying and be, described construction technology is further comprising the steps of:
(5) clear hole；
(6) steel reinforcement cage processing lifting；
(7) concreting；
(8) joint processes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106592578A (en) * | 2016-12-31 | 2017-04-26 | 上海远方基础工程有限公司 | Ultrahigh-strength rock layer wall forming method |
| CN106638693A (en) * | 2016-12-24 | 2017-05-10 | 广东宏大广航工程有限公司 | Dismantling construction method of immersed tunnel steel-pipe pile concrete wall by drilling and blasting |
| CN111042061A (en) * | 2019-12-30 | 2020-04-21 | 中国水电基础局有限公司 | Construction method of ultra-deep impervious wall |
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| CN106638693A (en) * | 2016-12-24 | 2017-05-10 | 广东宏大广航工程有限公司 | Dismantling construction method of immersed tunnel steel-pipe pile concrete wall by drilling and blasting |
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Application publication date: 20160907 |