CN106836249A - Small deep-well precipitation method in power network overhead transmission line foundation construction - Google Patents
Small deep-well precipitation method in power network overhead transmission line foundation construction Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
Small deep-well precipitation method in power network overhead transmission line foundation construction, is related to the small deep-well precipitation method in foundation construction.Seriously, effective dewatering measure need to be needed in the foundation excavation stage because water-bearing layer is cut off infiltration phenomenon in hole after excavation of foundation pit.The technical program selects different small deep-wells to be laid out under different water source environments, and by fast and effectively punch pattern, can realize small deep-well borehole with low cost；Only pass through bottom concrete back cover without sandpipe with stone and cement and positioned at shaft bottom in the middle of two ends sand, stone, cement, can be very good filter water source, and prevent sandy soil, silt soil from being emitted from shaft bottom, influence dewatering effect；By without filling gravel material around sandpipe, the mud of surrounding can not only be stopped, water can be allowed to pass through to enter without in sandpipe, being easy to water pump to extract out without sandpipe by permeable again simultaneously, small deep-well precipitation measurement layout is convenient, it is simple using instrument, dewatering effect is good, without separately setting gutter, catch pit, manpower and materials less investment, and slope failure can be effectively prevented, Rain quality and construction safety can be effectively ensured.
Description
Technical field
Small deep-well precipitation method in the present invention relates to foundation construction, more particularly to a kind of power network overhead transmission line foundation construction
In small deep-well precipitation method.
Background technology
In recent years, with the development of " special, high, new, intelligence " power grid construction, the implementation of " four friendships five are straight " plan, extra-high voltage is built
The normalization of facility work.Huainan~AC extra high voltage project of transmitting and converting electricity East China, 1000 kilovolts of Nanjing~Shanghai extra-high voltage main grid structure
Important composition department, Lower Changjiang River region landforms belong to estuary area alluvial-proluvial plain, and it is complete by the 4th that basic foundation soil is main
The compositions such as silt, flour sand, the silty clay folder silt of the new system alluviation origin cause of formation.Rack circuit is level land, and major part is farmland, fish
The pool network of rivers is relatively more, and surface drainage is more flourishing.Rack line tower foundation form is bored concrete pile foundation, cushion cap part buried depth（Open
Dig depth）1.7~4.6m, 1.0~2.5m of underground water fixed level buried depth.Because water-bearing layer is cut off infiltration in hole after excavation of foundation pit
Phenomenon is serious, causes excavation slope to cave in influence subsequent construction, therefore needs effective dewatering measure in the foundation excavation stage, makes
Foundation soil keeps drying in excavation and foundation construction.
The content of the invention
The technical problem to be solved in the present invention and the technical assignment for proposing are prior art to be improved and is improved,
Small deep-well precipitation method in power network overhead transmission line foundation construction is provided, is mesh so that Rain quality and construction safety is effectively ensured
's.Therefore, the present invention takes following technical scheme.
Small deep-well precipitation method in power network overhead transmission line foundation construction, comprises the following steps：
1）Actual water source environment according to basis is measured and determines the placement position of small deep-well, and described basis is near water source
In the case of, selection is respectively arranged four small deep-wells in the range of four leg foundation ditch 0.5~2m of side of steel tower, forms a circular precipitation
Net；Described basis is disposed about a small deep-well in the case of away from water source in the Center stake of four leg foundation ditches of steel tower；Paint
Go out small deep-trap sites layout drawing and calculate the buried depth of small deep-well, to the central point setting-out mark of small deep-well；
2）Centered on the central point of setting-out mark small deep-well well head, institute are excavated using the drilling tool with gauge circle drag bit
The small deep-well well head diameter mm between 400 ~ 550 for stating, excavates downwards size between 0.4 ~ 0.7m, is excavated in well head and completed
Afterwards, using high-pressure hydraulic pump, by soil punching pine, drill bit reverse circulation is made during punching, trimming rotation in side is until reach requirement hole depth position；
3）After wellhole is washed into, high-pressure hydraulic pump punching pipe is extracted immediately, it is lower without sandpipe, it is described without sandpipe two ends sand, stone, cement
Make, it is middle only to use stone and cement, the diameter without sandpipe between 300 ~ 500mm, between 800 ~ 1200mm of single-unit pipe height,
Every below waterline needs looping nylon wire outside without sandpipe, should be slow without sandpipe decentralization, when wellbore depth requirement more piece
When being connected without sandpipe, then it is further added by placing without sandpipe, two joint nylon of the section without sandpipe on the basis of prosthomere is without sandpipe
Net is wrapped up in sternly, in order to avoid clamp-oning silt particle silts well casing up, is vertically fixed with fixed strip；After the completion of sandpipe decentralization, small deep-well well head should height
In ground, bottom concrete is then poured into the bottom without sandpipe, ttom of pipe is blocked, then without filling between sandpipe and hole wall
Gravel material；
4）After filling gravel material, should abundant well-flushing in time, until drainage is unimpeded, and the inspection dewatering well that should draw water drainage effect；
5）Carry out careful inspection comprehensively to water pump, the sealing of cable connector has a non-loosening, cable whether there is destruction the feelings such as to fracture
Condition；Then water pump is hung in into drainage layer position with rope to be powered, underground water is just extracted by the outlet pipe on water pump.
Different small deep-wells are selected to be laid out under different water source environments, and by fast and effectively punch pattern, can
Small deep-well borehole is realized with low cost；Only with stone and cement and positioned at shaft bottom without sand in the middle of two ends sand, stone, cement
Pipe can be very good filter water source by bottom concrete back cover, and prevent sandy soil, silt soil from being emitted from shaft bottom, influence drop
Water effect；By without gravel material is filled around sandpipe, can not only stop the mud of surrounding, while water can be allowed to pass through again by permeable
Enter without in sandpipe, being easy to water pump to extract out without sandpipe, small deep-well precipitation measurement layout is convenient, dewatering effect simple using instrument
It is good, without separately setting gutter, catch pit, manpower and materials less investment, and slope failure can be effectively prevented, precipitation matter can be effectively ensured
Amount and construction safety.
As further improving and supplementing to above-mentioned technical proposal, present invention additionally comprises following additional technical feature.
The buried depth computational methods of the small deep-well of described determination areL=H+h+iY, in formula：L-- it is the deep-well pipe depth of burying；H--
It is foundation depth, original soil layer is started at；h-- it is depth of the water surface away from foundation ditch bottom after precipitation, typically takes 0.5~1m；i-- it is precipitation area
Interior hydraulic gradient (taking 0.1~0.3)；Y-- small deep-well from hole base with a distance from, during small deep-well center arrangement,YIt is from Center stake
To the distance on farthest foundation ditch base.By theoretical calculation, the borehole buried depth of small deep-well most effective can be quickly realized, digging is too
It is deep easily to lose time, and it is possible to cause piping, the too shallow of digging does not reach dewatering effect.
The drilling depth of described small deep-well is preferably greater than 0.3~0.5m of dewatering well projected depth.Due to that can go out in construction
Existing bottom slurry or fall soil situations such as and small deep-well bottom needs back cover, in order to effectively reach the buried depth without sandpipe to realize reason
The dewatering effect thought, it is necessary to bore deep certain depth than projected depth again.
It is higher than well head when having transferred without the sandpipe mouth of pipe when described small deep-well depth needs to use more piece without sandpipe
During 150~300mm, to being attached without sandpipe, vertically well casing is fixed with the bamboo cane of 2-4 bars 30mm 2~3m wide, long；Well
Mouth is preferably above the ground level more than 100mm.Carry out being connected without sandpipe higher than well head certain distance without sandpipe having transferred, be easy to behaviour
Make, be not only able to effectively fix well casing using the bamboo cane of 2~3m long, and bamboo cane cost is very low, can be with effectively save construction
Cost；Small deep-well well head is above the ground level more than 100 millimeters, can effectively prevent the object outside small deep-well from falling into well.
During filling gravel material, with spade along continuous blanking is enclosed without sandpipe one, filling out gravel material must disposably complete, and be filled out to well head the bottom of from
Lower 0.5 ~ 1.2m or so, gravel material selection 3~15mm river sands are advisable, and gravel material is uniformly inserted along the outer surrounding of well casing.By continuous blanking
It is disposable to complete filling, can effectively reduce mud that side wall drops or other soil cause the situation of permeable effect reduction to go out
Existing, not only permeable effect is good and with low cost for 3~15mm river sands.
The water yield of described water pump should be greater than 1.2 times of individual well capacity of outlet water, and individual well capacity of outlet water is pressed《Building foundation pit branch
Shield technical regulation》Publicity in JGJ 120 is calculated：In formula：-- individual well capacity of outlet water（m³/d）；--
Without sandpipe radius；-- without sandpipe water inlet portion length；-- AQUIFER HYDRAULIC.The water yield of water pump is more than individual well water outlet
1.2 times of ability can be discharged effectively without drainage in sandpipe, can effectively reduce water layer around foundation ditch highly.
Described nylon wire uses the net type of 30 mesh~40 mesh, the nylon wire lap of splice to be about nylon wire single width width
20%~50%.It is the foundation soil ring of the compositions such as silt, flour sand, the silty clay folder silt of the Holocene series alluviation origin cause of formation for the 4th
Border, the nylon wire of 30 mesh~40 mesh can be filtered effectively to water table.
Beneficial effect：Compared with traditional precipitation method, small deep-well precipitation is following excellent using having in line tower foundation construction
Point：
（1）Construction equipment is simple, flexible；
（2）Dewatering effect is good, the hole bottom precipitation region soil body is kept drying in the foundation construction time, and gutter, collection are set without another
Puddle；
（3）Input human and material resources are few during precipitation, and precipitation cost is relatively low；
（4）Slope failure can be effectively prevented, slope stability is improved, particularly to flour sand silt, Bian the method can be protected effectively
Card Rain quality and construction safety.
Brief description of the drawings
Fig. 1 is precipitation schematic diagram of the present invention.
Fig. 2 is dewatering device structural representation of the present invention.
Fig. 3 is the small deep-trap sites figure of present example one.
Fig. 4 is the small deep-trap sites figure of present example two.
Fig. 5 is small deep-well buried depth schematic diagram of the invention.
In figure：1- wellholes；2- is without sandpipe；3- water pumps；4- bottom concretes；5- nylon wires；6- gravel material；7- outlet pipes；8-
Foundation ditch；The small deep-wells of 9-；10- Center stakes.
Specific embodiment
Technical scheme is described in further detail below in conjunction with Figure of description.
Example one
As shown in Fig. 1,2,3,5, the small deep-well precipitation method in power network overhead transmission line foundation construction is comprised the following steps：
1）Actual water source environment according to basis near water source is measured and determines the placement position of small deep-well 9, is selected in steel tower four
1 small deep-well 9 is each arranged at the side 1m of foundation ditch 8 of bar leg respectively, a circular precipitation nets are formed by 4 small deep-wells 9, drawn
The location arrangements figure of small deep-well 9 simultaneously calculates the buried depth of small deep-well 9, to the central point setting-out mark of small deep-well 9；
2）The small well head of deep-well 9 is excavated using the drilling tool with gauge circle drag bit centered on the central point of setting-out mark,
The described a diameter of 500mm of well head of small deep-well 9, it is 0.5m that size is excavated downwards, after the completion of well head excavation, using high-pressure hydraulic pump
3, by soil punching pine, drill bit reverse circulation is made during punching, trimming rotation in side is until reach requirement hole depth position；
3）After wellhole 1 is washed into, the punching pipe of high-pressure hydraulic pump 3 is extracted immediately, it is lower without sandpipe 2, without the two ends sand of sandpipe 2, stone, cement system
Make, middle only to use stone and cement, a diameter of 380mm without sandpipe 2, single-unit pipe highly is 950mm, below waterline without sand
Pipe 2 needs looping nylon wire 5 outside, should be slow without the decentralization of sandpipe 2, when the depth requirements more piece of wellhole 1 is connected without sandpipe 2, then
It is further added by placing on the basis of prosthomere is without sandpipe 2 without sandpipe 2, two joint nylon wires 5 of the section without sandpipe 2 are wrapped up in sternly, in order to avoid
Clamp-on silt particle and silt well casing up, vertically fixed with fixed strip, after the completion of being transferred without sandpipe 2, the well head of small deep-well 9 should be higher than that ground, so
Bottom concrete 4 is poured into the bottom without sandpipe 2 afterwards, ttom of pipe is blocked, then without filling gravel between sandpipe 2 and the wall of wellhole 1
Material 6；
4）After filling gravel material 6, should abundant well-flushing in time, until drainage is unimpeded, and the inspection dewatering well that should draw water drainage effect；
5）Carry out careful inspection comprehensively to water pump 3, the sealing of cable connector has a non-loosening, cable whether there is destruction the feelings such as to fracture
Condition.Then water pump 3 is hung in into drainage layer position energization underground water with rope to be just extracted by the outlet pipe 7 on water pump 3.
In order to realize being best suitable for without the buried depth of sandpipe 2, realize in effective precipitation, this example, determine the buried depth meter of small deep-well 9
Calculation method isL=H+h+iY, in formula：L-- it is the deep-well pipe depth of burying；H-- it is the depth of foundation ditch 8, original soil layer is started at；h-- it is precipitation
Depth of the water surface away from the bottom of foundation ditch 8, typically takes 1m afterwards；i-- it is the hydraulic gradient (taking 0.2 meter) in precipitation area；Y-- small deep-well 9 from
Cheat the distance on base.By theoretical calculation, the borehole buried depth of small deep-well, the too deep easily wave of digging most effective can be quickly realized
Time-consuming, and it is possible to cause piping, the too shallow of digging does not reach dewatering effect.
In order to prevent bottom slurry or influence of the soil to buried depth that fall, in this example, the drilling depth of small deep-well 9 is more than precipitation
Well projected depth 0.3m.Because of situations such as bottom slurry occurring in construction or the soil and small deep-well bottom needs back cover of falling,
In order to effectively reach the buried depth without sandpipe to realize preferable dewatering effect, it is necessary to bore deep certain depth again than projected depth.
For the ease of falling into the probability without sandpipe 2 to being attached without sandpipe 2 and reducing foreign object, in this example, small depth
The depth of well 9, without sandpipe 2, when the section transferred is higher than well head 200mm without the mouth of pipe of sandpipe 2, then is being transferred using 2 sections
Without a section is placed on sandpipe 2 without sandpipe 2,2 sections are attached without sandpipe 2, it is vertical with 4 30mm are wide, 2m long bamboo
Bar fixes well casing, and the well head after the completion of being placed without sandpipe 2 is preferably above the ground level 200mm.It is higher than well head having transferred without sandpipe 2
Certain distance connected without sandpipe 2, is easy to operation, is not only able to effectively fix well casing using the bamboo cane of 2~3m long, and
Bamboo cane cost is very low, can be with effectively save construction cost；The well head of small deep-well 9 is above the ground level more than 100 millimeters, can be effective
Prevent the object outside small deep-well 9 from falling into well.
For the pockets of soil for preventing side from falling and other objects permeable effect of the reduction without sandpipe 2, in this example, with spade along nothing
The continuous blanking of the circle of sandpipe 2 one carries out gravel material 6 and fills, and filling out gravel material 6 must disposably be completed, and 1m or so, gravel material are filled out under well head the bottom of from
The river sand of 6 selection 3~15mm scopes is advisable, and gravel material 6 is uniformly inserted along the outer surrounding of well casing.Disposably complete to fill out by continuous blanking
Fill, can effectively reduce mud that side wall drops or other soil cause the situation of permeable effect reduction to occur, 3~15mm rivers
Not only permeable effect is good and with low cost for sand.
In order to effectively reduce the water layer around foundation ditch 8 highly, in this example, the water yield of water pump 3 is more than individual well water outlet
1.2 times of ability, individual well capacity of outlet water is pressed《The support technology code of building foundation pit 8》Publicity in JGJ 120 is calculated：In formula：-- individual well capacity of outlet water（m³/d）；-- without the radius of sandpipe 2；-- it is long without the water inlet portion of sandpipe 2
Degree；-- AQUIFER HYDRAULIC.The water yield of water pump can be discharged effectively without in sandpipe more than 1.2 times of individual well capacity of outlet water
Drainage, can effectively reduce water layer around foundation ditch highly.
In order to the pockets of soil for being directed to construction area can realize effectively filtering, in this example, nylon wire 5 uses the net of 30 mesh
Type, the lap of splice of nylon wire 5 is about the 20% of the single width width of nylon wire 5.It is the silt of the Holocene series alluviation origin cause of formation, powder for the 4th
The foundation soil environment of the compositions such as sand, silty clay folder silt, the nylon wire 5 of 30 mesh can be carried out effectively to water table
Filter.
Example two
It is that basis is away from water source, the cloth near four Center stakes of leg foundation ditch 8 10 of steel tower with one difference of above example
A small deep-well 9 is put, the buried depth computational methods for determining small deep-well 9 areL=H+h+iY, in formula： YIt is from Center stake 10 to farthest base
Cheat the distance on 8 bases.
Small deep-well precipitation method in figure 1 above, the power network overhead transmission line foundation construction shown in 2,3,4,5 is of the invention
Specific embodiment, has embodied substantive distinguishing features of the present invention and progress, can be opened of the invention according to actual use needs
Under showing, carry out the equivalent modifications of the aspects such as shape, structure to it, this programme protection domain row.
Claims (7)
1. the small deep-well precipitation method in the foundation construction of power network overhead transmission line, it is characterised in that comprise the following steps：
1）Actual water source environment according to basis is measured and determines small deep-well（9）Placement position, described basis is near water
In the case of source, select in four leg foundation ditches of steel tower（8）1 small deep-well is each arranged in the range of 0.5~2m of side respectively（9）, lead to
Cross 4 small deep-wells（9）Form a circular precipitation net；Described is basic in the case of away from water source, in four leg bases of steel tower
Hole（8）Center stake（10）It is disposed about a small deep-well（9）；Draw small deep-well（9）Location arrangements figure simultaneously calculates small deep-well
（9）Buried depth, to small deep-well（9）Central point setting-out mark；
2）Centered on the central point of setting-out mark small deep-well is excavated using the drilling tool with gauge circle drag bit（9）Well
Mouthful, described small deep-well（9）Well head diameter mm between 400 ~ 550, excavates downwards size between 0.4 ~ 0.7m, is opened in well head
After the completion of digging, using high-pressure hydraulic pump（3）, by soil punching pine, drill bit reverse circulation being made during punching, trimming rotation in side is until reach requirement
Hole depth position；
3）Wellhole（1）After being washed into, high-pressure hydraulic pump is extracted immediately（3）Punching pipe, it is lower without sandpipe（2）, it is described without sandpipe（2）Two ends
Made of sand, stone, cement, it is middle only to use stone and cement, without sandpipe（2）Diameter between 300 ~ 500mm, single-unit pipe is highly
Between 800 ~ 1200mm；Every below waterline is without sandpipe（2）Need looping nylon wire outside（5）, without sandpipe（2）Decentralization should
Slowly, wellhole is worked as（1）Depth requirements more piece is without sandpipe（2）During connection, then in prosthomere without sandpipe（2）On the basis of be further added by place
Without sandpipe（2）, two sections are without sandpipe（2）Joint nylon wire（5）Wrap up in sternly, in case clamp-oning silt particle silts well casing up, it is vertical with admittedly
Determine bar to fix, without sandpipe（2）After the completion of decentralization, small deep-well（9）Well head should be higher than that ground, then bottom concrete（4）Pour into
Without sandpipe（2）Bottom, ttom of pipe is blocked, then without sandpipe（2）With wellhole（1）Gravel material is filled between wall（5）；
4）Filling gravel material（5）Afterwards, should abundant well-flushing in time, until drainage is unimpeded, and the inspection dewatering well that should draw water drainage effect；
5）To water pump（3）Comprehensively careful inspection is carried out, the sealing of cable connector has non-loosening, and cable whether there is destruction to fracture
Situation；Then with rope by water pump（3）Hang in drainage layer position to be powered, underground water just passes through water pump（3）On outlet pipe（7）Quilt
Extract out.
2. the small deep-well precipitation method in power network overhead transmission line foundation construction according to claim 1, it is characterised in that：Institute
The small deep-well of determination stated（9）Buried depth computational methods beL=H+h+iY, in formula：L-- it is the deep-well pipe depth of burying；H-- it is foundation ditch
（8）Depth, original soil layer is started at；h-- for after precipitation the water surface away from foundation ditch（8）The depth at bottom, typically takes 0.5~1m；i-- it is precipitation area
Interior hydraulic gradient,iTake 0.1~0.3；Y-- small deep-well（9）With a distance from the base of hole, small deep-well（9）During center arrangement,YBe from
Center stake（10）To farthest foundation ditch（8）The distance on base.
3. the small deep-well precipitation method in power network overhead transmission line foundation construction according to claim 1, it is characterised in that：Institute
The small deep-well stated（9）Drilling depth be preferably greater than 0.3~0.5m of dewatering well projected depth.
4. the small deep-well precipitation method in power network overhead transmission line foundation construction according to claim 1, it is characterised in that：Institute
The small deep-well stated（9）Depth needs to use more piece without sandpipe（2）When, when having transferred without sandpipe（2）The mouth of pipe is higher than well head 150
During~300mm, to without sandpipe（2）It is attached, vertically fixes well casing, nothing with the bamboo cane of 2-4 bars 30mm 2~3m wide, long
Sandpipe（2）After the completion of placement, well head is preferably above the ground level more than 100mm.
5. the small deep-well precipitation method in power network overhead transmission line foundation construction according to claim 1, it is characterised in that：Fill out
Fill gravel material（5）When, with spade along without sandpipe（2）The one continuous blanking of circle, fills out gravel material（5）Must disposably complete, be filled out to well head the bottom of from
Lower 0.5 ~ 1.2m or so, gravel material（5）Selection 3~15mm river sands are advisable, gravel material（5）Uniformly inserted along the outer surrounding of well casing.
6. the small deep-well precipitation method in power network overhead transmission line foundation construction according to claim 1, it is characterised in that：Institute
The water pump stated（3）Water yield should be greater than 1.2 times of individual well capacity of outlet water, individual well capacity of outlet water is pressed《Building foundation pit（8）Supporting skill
Art code》Publicity in JGJ 120 is calculated：In formula：-- individual well capacity of outlet water（m³/d）；-- without sandpipe
（2）Radius；-- without sandpipe（2）Water inlet portion length；-- AQUIFER HYDRAULIC.
7. the small deep-well precipitation method in power network overhead transmission line foundation construction according to claim 1, it is characterised in that：Institute
The nylon wire stated（5）Using the net type of 30 mesh~40 mesh, nylon wire（5）The lap of splice is about nylon wire（5）The 20% of single width width
~50%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611208219.6A CN106836249A (en) | 2016-12-23 | 2016-12-23 | Small deep-well precipitation method in power network overhead transmission line foundation construction |
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| CN201611208219.6A CN106836249A (en) | 2016-12-23 | 2016-12-23 | Small deep-well precipitation method in power network overhead transmission line foundation construction |
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| CN106836249A true CN106836249A (en) | 2017-06-13 |
Family
ID=59136946
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114991188A (en) * | 2022-04-23 | 2022-09-02 | 中国五冶集团有限公司 | Deep foundation pit drainage structure |
| CN115467360A (en) * | 2022-09-02 | 2022-12-13 | 国网辽宁省电力有限公司锦州供电公司 | Construction method for iron tower foundation in marsh or muddy area |
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| JP2007100401A (en) * | 2005-10-05 | 2007-04-19 | Izumi Pump Seisakusho:Kk | Undergroundwater level lowering apparatus |
| CN204163092U (en) * | 2014-09-15 | 2015-02-18 | 中铁十二局集团有限公司 | Dewatering well bamboo cage chimney filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114991188A (en) * | 2022-04-23 | 2022-09-02 | 中国五冶集团有限公司 | Deep foundation pit drainage structure |
| CN114991188B (en) * | 2022-04-23 | 2023-08-25 | 中国五冶集团有限公司 | Deep foundation pit drainage structure |
| CN115467360A (en) * | 2022-09-02 | 2022-12-13 | 国网辽宁省电力有限公司锦州供电公司 | Construction method for iron tower foundation in marsh or muddy area |
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