CN102031782A - Layered inclined hole blast construction method for multilayer complex quicksand foundation - Google Patents
Layered inclined hole blast construction method for multilayer complex quicksand foundation Download PDFInfo
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- CN102031782A CN102031782A CN2009101967073A CN200910196707A CN102031782A CN 102031782 A CN102031782 A CN 102031782A CN 2009101967073 A CN2009101967073 A CN 2009101967073A CN 200910196707 A CN200910196707 A CN 200910196707A CN 102031782 A CN102031782 A CN 102031782A
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Abstract
The invention relates to a deep foundation pit construction method, in particular to a blast construction method for a multilayer complex quicksand foundation pit. The layered drilled inclined hole blasting method of the multilayer complex foundation deep foundation pit comprises the following steps of: 1, determining the deep foundation pit foundation structure form rock stratum layout, stripping the superficial clay and setting out a blasting surface of the deep foundation pit; 2, selecting a blasting drilling way, namely adopting the blasting drilling way that the inclined holes are drilled on a side slope of the deep foundation pit and boreholes are vertically drilled in the middle of the foundation pit, wherein the diameter of the boreholes is more than or equal to 50mm and the blasted holes are distributed in the shape of a plum-shaped regular triangle at an interval of 1.5m; 3, determining the depth, the angle and the layering of the boreholes; 4, determining the blasting explosive loading amount; and 5, blasting and excavating soil and rocks. By the method, influence of blasting on a built workshop column base and a workshop steel structure can be reduced and the problem of foundation pit blasting when the rock stratum contains quicksand is solved.
Description
Technical field
The present invention relates to construction method of deep foundation ditch, relate in particular to the foundation ditch blasting construction method of the complicated drift sand formation geology of multilayer class.The seismic forces that the present invention is specially adapted to avoid explosion to produce has been built the deep foundation ditch blast working of concrete structure and workshop steel structure influence to the next-door neighbour.
Background technology
Under the complicated rock geology condition of civil construction field multilayer class in the deep foundation pit construction, normally opening operation of measures of foundation treatment, drift sand formation is assisted suitable precipitation, carries out ground vertical drilling explosion large tracts of land excavation technology, carries out the deep foundation construction in the basic unit after the explosion.During the vertical drilling operation, each big gun hole all will be drilled on the side slope on the side slope like this, after detonating, because the effect of explosive charge, falls side slope is overbreak, even does not have side slope, forms a hollow place straight up and down; Owing to there is not side slope, cause with backhoe and can not once dig design elevation, what have also needs to dig side slope again, backhoe is reached carried out the secondary relay in the hole and cut the earth, and so also can cause backbreaking and filling out more of the cubic metre of earth and stone, and earthwork is big, long construction period.
In similar geological conditions deep foundation pit construction, meet the transformation of online Equipment Foundations in construction of structures or the factory building, large tracts of land excavation vertical drilling blasting technology or machinery cut and can't satisfy environmental protection and construction period, and construction cost is higher simultaneously.
Summary of the invention
The present invention is intended to address the deficiencies of the prior art, and the blasting method of a kind of multilayer complex foundation deep foundation ditch layering rat holing is provided.The present invention can reduce explosion to the influence of construct the factory buildings base for post and workshop steel structure and solve foundation ditch explosion when containing drift sand in the rock stratum.The present invention has significantly reduced the cubic metre of earth and stone of deep foundation ditch explosion, safely, fast, finishes rock blasting, excavation and structural safety construction at the complicated drift sand formation geology of multilayer class deep foundation ditch with guaranteeing the quality, has created the continuous productive process time simultaneously, has shortened the construction period greatly.
The present invention is achieved in that
The blasting method of a kind of multilayer complex foundation deep foundation ditch layering rat holing, be particularly suitable for to next-door neighbour built concrete structure and workshop steel structure the explosion of multilayer complex foundation deep foundation ditch layering rat holing, described blasting method comprises the steps:
Step 1, determine deep foundation ditch foundation structure form rock stratum layout, the top layer clay is peeled off, deep foundation ditch explosion face unwrapping wire;
Step 2, selection blasting boreholes form; According to factory building columns basis or existing structure protection requirement, adopted the blasting boreholes form that rat holing and foundation ditch intermediate vertical are holed on deep foundation pit slope, bore diameter 〉=50mm, blast hole is plum blossom shape equilateral triangle cloth hole according to spacing 1.5m.
Step 3: determine drilling depth and angle;
Step 4: determine the blast charging amount;
Step 5: explosion and earthwork evacuation.
The blasting method of described multilayer complex foundation deep foundation ditch layering rat holing, described step 1 adopts digging machine to remove surface, face of land soil layer, after exposing rock, carry out the unwrapping wire second time, the rock slope unwrapping wire was in 1: 0.3 ratio, after explosion, side slope can reach 1: 0.5 slope requirement under the effect of explosion, can reduce the earthwork of explosion and to the influence of environment.
The blasting method of described multilayer complex foundation deep foundation ditch layering rat holing, described step 3 comprises according to foundation ditch ambient conditions, the degree of depth and size, situations such as rock stratum distribution and drift sand formation are determined drilling depth, angle and layering, the described deep foundation ditch degree of depth at 8m with interior, deep foundation pit slope rat holing bore angle scope is at 65 °～80 °, with excavation slope apart from about 600mm～800mm, if foundation depth greater than 8m or the underground current sand bed is arranged, is taked secondary blasting or repeatedly explosion; Foundation depth is greater than 8m, and drilling depth is controlled at 5m for the first time, for the last time boring is got into that 500mm gets final product under the design elevation; And at the position that drift sand formation is arranged, for the first time the last 200～300mm of blasthole drilling to drift sand formation carried out water conservancy diversion and peel off blast working, the influence when having solved drift sand formation to explosion.
The blasting method of described multilayer complex foundation deep foundation ditch layering rat holing, the size of described step 4 shot hole are carried out the blast charging amount according to calculating and determining unit powder consumption 0.35kg/m in conjunction with on-the-spot examination is quick-fried
3, requiring the usefulness of each explosion to roll dose must not be greater than 12 casees (every case 25kg).The unit consumption that the explosive payload in each hole should keep relative stability, simultaneously, should there be enough stemming lengths in each powder charge hole, and shallow eye should be greater than 800mm.Work progress reduces powder charge two, and every hole is calculated needs explosive charge to take advantage of 0.8, and explosive charge must not be used the limit, and that reduces the shock momentum of explosion time and explosion time flies to throw the rubble height and distance.
The supporting method of described foundation ditches for reforming on-line equipment foundations in factory buildings, described step 5 comprise the cleaning of detonating with the cubic metre of earth and stone.Detonate and adopt the automatically controlled way of detonating, general 10～15 boreholes detonate simultaneously when detonating at every turn.Explosion finishes and adopts digging machine, pick machine to carry out the cleaning of the foundation pit earth cubic meter of stone and side slope, for structure construction creates conditions.
The present invention makes full use of at the inclined hole big gun of basic edge and the vertical big gun at center, and tiltedly the strength of big gun is up lifted the emplacement strength of inside toward interior effect, and the strength that big gun directly makes progress in the middle of the control under both actings in conjunction, plays the effect of lifting big gun and loosening big gun.Put the technology of lifting big gun and loosening big gun, form oblique big gun hole, the point type explosion that vertical hole layering explosion combines, seismic forces has been built concrete structures and steel work influence and has been solved foundation ditch explosion when containing drift sand in the rock stratum neighbouring when having reduced deep foundation ditch explosion under the multilayer class complex foundation, seismic forces to the explosion edge when guaranteeing explosion is in controlled range, significantly reduced the cubic metre of earth and stone of multilayer class complicated geological deep foundation ditch explosion, safety, fast, finish the rock blasting of deep foundation ditch with guaranteeing the quality, excavation and structural safety construction have realized that simultaneously the construction continuous productive process has shortened the construction period greatly.
The specific embodiment
The blasting method of a kind of multilayer complex foundation deep foundation ditch layering rat holing, be particularly suitable for to next-door neighbour built concrete structure and workshop steel structure the explosion of multilayer complex foundation deep foundation ditch layering rat holing, described blasting method comprises the steps:
Step 1, determine deep foundation ditch foundation structure form rock stratum layout, the top layer clay is peeled off, deep foundation ditch explosion face unwrapping wire;
Step 2, selection blasting boreholes form; According to factory building columns basis or existing structure protection requirement, adopted the blasting boreholes form that rat holing and foundation ditch intermediate vertical are holed on deep foundation pit slope, bore diameter 〉=50mm, blast hole is plum blossom shape equilateral triangle cloth hole according to spacing 1.5m.
Step 3: determine drilling depth and angle;
Step 4: determine the blast charging amount;
Step 5: explosion and earthwork evacuation.
The blasting method of described multilayer complex foundation deep foundation ditch layering rat holing, described step 1 adopts digging machine to remove surface, face of land soil layer, after exposing rock, carry out the unwrapping wire second time, the rock slope unwrapping wire was in 1: 0.3 ratio, after explosion, side slope can reach 1: 0.5 slope requirement under the effect of explosion, can reduce the earthwork of explosion and to the influence of environment.
The blasting method of described multilayer complex foundation deep foundation ditch layering rat holing, described step 3 comprises according to foundation ditch ambient conditions, the degree of depth and size, situations such as rock stratum distribution and drift sand formation are determined drilling depth, angle and layering, the described deep foundation ditch degree of depth at 8m with interior, deep foundation pit slope rat holing bore angle scope is at 65 °～80 °, with excavation slope apart from about 600mm～800mm, if foundation depth greater than 8m or the underground current sand bed is arranged, is taked secondary blasting or repeatedly explosion; Foundation depth is greater than 8m, and drilling depth is controlled at 5m for the first time, for the last time boring is got into that 500mm gets final product under the design elevation; And at the position that drift sand formation is arranged, for the first time the last 200～300mm of blasthole drilling to drift sand formation carried out water conservancy diversion and peel off blast working, the influence when having solved drift sand formation to explosion.
The blasting method of described multilayer complex foundation deep foundation ditch layering rat holing, the size of described step 4 shot hole are carried out the blast charging amount according to calculating and determining unit powder consumption 0.35kg/m in conjunction with on-the-spot examination is quick-fried
3, requiring the usefulness of each explosion to roll dose must not be greater than 12 casees (every case 25kg).The unit consumption that the explosive payload in each hole should keep relative stability, simultaneously, should there be enough stemming lengths in each powder charge hole, and shallow eye should be greater than 800mm.Work progress reduces powder charge two, and every hole is calculated needs explosive charge to take advantage of 0.8, and explosive charge must not be used the limit, and that reduces the shock momentum of explosion time and explosion time flies to throw the rubble height and distance.
The supporting method of described foundation ditches for reforming on-line equipment foundations in factory buildings, described step 5 comprise the cleaning of detonating with the cubic metre of earth and stone.Detonate and adopt the automatically controlled way of detonating, general 10～15 boreholes detonate simultaneously when detonating at every turn.Explosion finishes and adopts digging machine, pick machine to carry out the cleaning of the foundation pit earth cubic meter of stone and side slope, for structure construction creates conditions.
Embodiment 1:
Certain district's underground pipe gallery deep foundation ditch blast working, drift sand bed thickness 300mm～500mm, the long 196m of underground pipe gallery Equipment Foundations foundation ditch, wide 10m, dark-7.5m～-8.2m.The supporting method that the online Equipment Foundations of the present invention are transformed foundation ditch comprises the steps,
Step 1, adopt digging machine to remove surface, face of land soil layer, expose rock after, carry out the unwrapping wire second time again, the rock slope unwrapping wire is in 1: 0.3 ratio, after explosion, the accessible slope requirement of side slope under the effect of explosion.
The ambient conditions such as size of step 2, consideration and deep foundation ditch, position, reasonable Arrangement hole, construction in the middle of construction, the foundation ditch on deep foundation pit slope, bore diameter 〉=50mm, blast hole is plum blossom shape equilateral triangle cloth hole according to spacing 1.5m.
Step 3, determine drilling depth, angle and layering;
Length of shot 2～6m, angular range be at 65 °～80 °, with excavation slope apart from about 600mm～800mm, take secondary blasting.Get into that 500mm gets final product under the design elevation.And the drift sand formation position is being arranged, and for the first time blasthole drilling 200～300mm to the drift sand formation is carried out water conservancy diversion and peels off blast working, solved the influence of drift sand formation to explosion.
Step 4, the shot hole that is drilled to according to step 2, step 3 carry out blast charging amount calculating and quick-fried definite in conjunction with on-the-spot examination, unit powder consumption 0.35kg/m
3, require the dosage of each explosion must not be greater than 12 casees (every case 25kg).Initiating equipment is selected: No. 8 industrial plain detonators of detonator employing, electric cap, millisecond elementary errors segmentation detonator; The rope class adopts industrial blasting fuze, and the length of every big gun detonating fuse can not be less than 1.2m; Explosive adopts No. 2 rock an-tnt explosives, emulsion or No. four an-tnt-oil explosives.The unit consumption that the explosive payload in each hole should keep relative stability, simultaneously, should there be enough stemming lengths in each powder charge hole, and shallow eye should be greater than 800mm.Work progress reduces explosive payload, and every hole is calculated needs explosive charge to take advantage of 0.8, and explosive charge must not be used the limit, and that reduces the shock momentum of explosion time and explosion time flies to throw the rubble height and distance.
After step 5, preceding step are all implemented, detonate and clear up cubic meter.Detonate and adopt the automatically controlled way of detonating, general 10～15 boreholes detonate simultaneously when detonating at every turn.Explosion finishes and adopts digging machine, pick machine to carry out the cleaning of the foundation pit earth cubic meter of stone and side slope, for structure construction creates conditions.
Embodiment 2
Certain district's milling train deep foundation ditch rock stratum explosion construction of remaining silent, drift sand bed thickness 300mm～800mm, factory building columns basis and workshop steel structure are constructed, the long 326m of foundation ditch, wide 45～15m, Equipment Foundations deeply-7～-10.1m; Carry out with reference to embodiment 1.
Claims (5)
1. multilayer complex foundation deep foundation ditch layering rat holing blasting method, it is characterized in that: described blasting method comprises the steps:
Step 1, determine deep foundation ditch foundation structure form rock stratum layout, the top layer clay is peeled off, deep foundation ditch explosion face unwrapping wire;
Step 2, selection blasting boreholes form; The blasting boreholes form of employing rat holing and foundation ditch intermediate vertical boring on deep foundation pit slope, bore diameter 〉=50mm, blast hole is plum blossom shape equilateral triangle cloth hole according to spacing 1.5m;
Step 3: determine drilling depth and angle and layering;
Step 4: determine the blast charging amount;
Step 5: explosion and earthwork evacuation.
2. multilayer complex foundation deep foundation ditch layering rat holing according to claim 1 blasting method, it is characterized in that: described step 1 adopts digging machine to remove surface, face of land soil layer, after exposing rock, carry out the unwrapping wire second time, the rock slope unwrapping wire was in 1: 0.3 ratio, after explosion, side slope reaches 1: 0.5 the gradient with the earthwork that reduces explosion and to the influence of environment under the effect of explosion.
3. multilayer complex foundation deep foundation ditch layering rat holing according to claim 1 blasting method is characterized in that: in the described step 3, deep foundation pit slope rat holing bore angle scope is at 65 °～80 °, with excavation slope apart from about 600mm～800mm.The described deep foundation ditch degree of depth with interior, is taked onepull at 8m.The described deep foundation ditch degree of depth is greater than 8m or the underground current sand bed is arranged, and takes secondary blasting or blasting method repeatedly: foundation depth is greater than 8m, and drilling depth is controlled at 5m for the first time, for the last time boring is got into 500mm under the design elevation; At the position that drift sand formation is arranged, for the first time blasthole drilling is carried out water conservancy diversion and peels off blast working influence during to explosion with the solution drift sand formation to the last 200～300mm of drift sand formation.
4. multilayer complex foundation deep foundation ditch layering rat holing according to claim 1 blasting method, it is characterized in that: need in the described step 4 to carry out the blast charging amount according to calculating and determining in conjunction with on-the-spot examination is quick-fried according to the size of step 2, three shot holes, unit consumption explosive charge remains on 0.35kg/m
3, and each explosion be not more than 300kg with explosive charge; Simultaneously, should there be enough stemming lengths in each powder charge hole, and shallow eye should be greater than 800mm; The concrete actual explosive payload of work progress is that the explosive charge that every aperture calculates gained multiply by 0.8, flies to throw the rubble height and distance with the shock momentum of minimizing explosion time and explosion time.
5. multilayer complex foundation deep foundation ditch layering rat holing according to claim 1 blasting method is characterized in that: detonate in the described step 5 and adopt automatically controlled detonating, 10～15 boreholes detonate simultaneously when detonating at every turn; Explosion finishes and adopts digging machine, pick machine to carry out the cleaning of the foundation pit earth cubic meter of stone and side slope, for structure construction creates conditions.
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| CN2009101967073A CN102031782A (en) | 2009-09-29 | 2009-09-29 | Layered inclined hole blast construction method for multilayer complex quicksand foundation |
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| CN2009101967073A CN102031782A (en) | 2009-09-29 | 2009-09-29 | Layered inclined hole blast construction method for multilayer complex quicksand foundation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967001A (en) * | 2013-01-25 | 2014-08-06 | 深圳市勘察测绘院有限公司 | Hole-forming construction method for punching pile |
| CN105297741A (en) * | 2015-10-20 | 2016-02-03 | 上海交通大学 | Prevention method for foundation pit retaining structure hole-punching and water-gushing caused by blast of stratum with soft upper portion and hard lower portion |
| CN105865276A (en) * | 2016-03-30 | 2016-08-17 | 中铁二院重庆勘察设计研究院有限责任公司 | Efficient shock absorption blasting and excavation method adopting fishbone-shaped construction guide grooves for large rock deep foundation pit in dense building area |
| CN105926631A (en) * | 2016-05-06 | 2016-09-07 | 中铁大桥局集团第五工程有限公司 | Construction method for excavating bridge foundation pit in steep rock surface |
| CN106088098A (en) * | 2016-06-15 | 2016-11-09 | 龙元建设集团股份有限公司 | Supporting removal construction method |
| CN106382867A (en) * | 2016-08-23 | 2017-02-08 | 中国科学院武汉岩土力学研究所 | Blasting excavation layered control method for nuclear power engineering foundation |
| CN109141153A (en) * | 2018-09-10 | 2019-01-04 | 河南工业大学 | A kind of blasting construction method controlling rock slope regularity and stability |
| CN112729035A (en) * | 2020-12-25 | 2021-04-30 | 上海二十冶建设有限公司 | Integral static blasting device for relatively complete rock stratum and construction method thereof |
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2009
- 2009-09-29 CN CN2009101967073A patent/CN102031782A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967001A (en) * | 2013-01-25 | 2014-08-06 | 深圳市勘察测绘院有限公司 | Hole-forming construction method for punching pile |
| CN105297741A (en) * | 2015-10-20 | 2016-02-03 | 上海交通大学 | Prevention method for foundation pit retaining structure hole-punching and water-gushing caused by blast of stratum with soft upper portion and hard lower portion |
| CN105865276A (en) * | 2016-03-30 | 2016-08-17 | 中铁二院重庆勘察设计研究院有限责任公司 | Efficient shock absorption blasting and excavation method adopting fishbone-shaped construction guide grooves for large rock deep foundation pit in dense building area |
| CN105926631A (en) * | 2016-05-06 | 2016-09-07 | 中铁大桥局集团第五工程有限公司 | Construction method for excavating bridge foundation pit in steep rock surface |
| CN106088098A (en) * | 2016-06-15 | 2016-11-09 | 龙元建设集团股份有限公司 | Supporting removal construction method |
| CN106382867A (en) * | 2016-08-23 | 2017-02-08 | 中国科学院武汉岩土力学研究所 | Blasting excavation layered control method for nuclear power engineering foundation |
| CN106382867B (en) * | 2016-08-23 | 2018-11-02 | 中国科学院武汉岩土力学研究所 | A kind of nuclear power engineering basis Blasting Excavation hierarchical control method |
| CN109141153A (en) * | 2018-09-10 | 2019-01-04 | 河南工业大学 | A kind of blasting construction method controlling rock slope regularity and stability |
| CN112729035A (en) * | 2020-12-25 | 2021-04-30 | 上海二十冶建设有限公司 | Integral static blasting device for relatively complete rock stratum and construction method thereof |
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Application publication date: 20110427 |