CN110359473A - A kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit - Google Patents
A kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit Download PDFInfo
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- CN110359473A CN110359473A CN201910679268.5A CN201910679268A CN110359473A CN 110359473 A CN110359473 A CN 110359473A CN 201910679268 A CN201910679268 A CN 201910679268A CN 110359473 A CN110359473 A CN 110359473A
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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
- E02D17/02—Foundation pits
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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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- 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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
The present invention relates to deep foundation pit precipitation technical fields, especially a kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit, include the following steps: that water-stop curtain is constructed, construction of soil-nailed wall, precipitation well construction, recharge well construction, monitoring measurement, project cost is effectively reduced in it, reduce influence of the engineering construction to ambient enviroment, fresh-water-saving resource, and guarantee engineering construction safety, groundwater resources can sufficiently be recycled, energy conservation is reached, it is water-saving, protect the green construction purpose of environment and safety construction, reduce earth excavation, the workload of base pit dewatering, accelerate construction speed, meet the increasingly strict requirement to environmental protection in city.
Description
Technical field
The present invention relates to deep foundation pit precipitation technical field, especially a kind of closed precipitation environmental protection and energy saving construction work of deep basal pit
Skill.
Background technique
With the fast development of novel Urbanization Construction, construction scope is expanded rapidly, and more and more is divided into
Apply and continuously emerge in large numbers, super large, the basement of ultra-deep are more and more, more heavy construction addressings along the river, coastal place.Ground
The lower preferable soil layer of permeability often connects with river water, and geologic information reflects geological state with being unable to entirely accurate sometimes, with
The excavation bottom sand water of foundation pit emerge out of foundation pit, or even will appear Piping phenomenon, at this moment with regard to needing to take quick Yield rainfall relation
Measure.
It is most of in domestic deep foundation pit precipitation construction also to use traditional well-points dewatering method, comprising: light well point, injection
The dewatering modes such as well point and tube well dewatering.Deep foundation pit precipitation using traditional well-points dewatering mode there are the problem of it is as follows: 1, engineering
Construction cost is high, and the underground water discharge amount of extraction is huge, can not effectively recycle.2, safety problem is prominent.
How in traditional Deep Foundation Pit Well-Point Dewatering technique construction cost high, water resource waste and problem of environmental pollution are solved,
Effectively control soil body sedimentation simultaneously, accelerates construction progress, ensures construction safety, realize green construction, be current China's deep basal pit
Dewatering construction needs the critical issue solved.
Summary of the invention
In view of the deficiency of the prior art, a kind of closed precipitation environmental protection and energy saving construction work of deep basal pit is provided
Skill is effectively reduced project cost, reduces influence of the engineering construction to ambient enviroment, fresh-water-saving resource, and guarantees engineering
Construction safety can sufficiently recycle groundwater resources, reached it is energy saving, water-saving, protection environment and safety construction it is green
Color construction purpose.The workload for reducing earth excavation, base pit dewatering, accelerates construction speed, and it is increasingly strict to meet city
The requirement to environmental protection.
In order to solve the above technical problems, the technical solution adopted by the present invention is that, a kind of closed precipitation environmental protection of deep basal pit
Saving construction technique, includes the following steps,
(1), water-stop curtain is constructed: drilling machine is in place, prepares cement, and setting slurry amount detects record, whitewashing stirring drilling, whitewashing
Stirring mentions, displacement；
(2), construction of soil-nailed wall:
A, the detailing requiments of steel tube for soil-nail: the outer diameter of steel pipe takes 48mm, wall thickness 3.5mm；In 1/2~1/3 steel of steel pipe inner end
Injected hole is set in the total length section of pipeclay nail；Slip casting bore dia is 8mm, and a slip casting section should be arranged symmetrically two slip castings
Hole, injected hole outside are protected using protection hangnail, are welded to connect between every steel tube for soil-nail；
B, the construction requirement of steel tube for soil-nail: steel tube end part transform as it is cone-shaped, top setting reinforce construction, prevent hammering steel
Deforming tops when pipe construction, the ratio of mud of grouting cement slurry take 0.5, and grouting pressure should be greater than 0.6MPa, steel pipe top and week
It encloses and just stops slip casting when there is returning slurry phenomenon；
C, the construction requirement of gunite concrete surface layer: fine aggregate should be less than 3% with medium coarse sand clay content, the grade of coarse aggregate
It should not exceed 10mm with ballast grain sizes, the weight ratio of cement and sandstone takes 1:4, and sand coarse aggregate ratio takes 50%, and the ratio of mud takes 0.45, and injection is made
Industry should construct from bottom to top and according to striping order, and one secondary control of jet thickness is in 50mm thickness；Spray head answers vertical wall
Injection keeps the distance of 0.8m or so；Timely water seasoning is wanted after concrete final set；Steel is re-layed after spraying a layer concrete
The thickness of protection tier greater than 20mm should be arranged in muscle net；When reinforcing bar is connected using overlap welding, fusion length should be greater than 10 times of steel
Muscle diameter；
(3), precipitation well construction: it is accurate to require to carry out each well point according to on-site actual situations and according to the well location of design
Measurement and positioning bores mud off pore-forming using circulation, and setting casing protects aperture, and mud pit and spoil disposal ditch may be provided at either side
Face, borehole cleaning and installation downcast well pipe carry out immediately after pore-forming, and downcast well pipe chimney filter is partially disposed in the top/bottom latitude in water-bearing layer
Interior, while wanting populated filtrate among downcast well pipe and hole wall, water pumping experiment carries out immediately after water pump installs, when can
It can start to work normally after reaching the precipitation requirement of design, time sight is answered to record well water position situation of change；
(4), recharge well construction:
A, inverted well are arranged Shi Yingyu dewatering well and keep one section of opposite distance, and inverted well should be kept at a distance from dewatering well
At 6 meters or more；
B should adjust in due course recharge amount according to the variation of level of ground water, take out to fill and balance each other；
(5), monitoring measurement:
A, datum mark, monitoring point laying should be according to following principle: the laying of datum mark should stablize, reliably, observation the phase
Between will not be damaged, monitoring point is arranged in the key point of internal force and deformation, is able to reflect the virtual condition and change of monitoring object
Change trend；
The safeguard measure of b, datum mark and monitoring point should include following requirement: be arranged in datum mark, monitoring location
Eye-catching warning mark is constructed according to the standing procedure of monitoring point in " building deformation measurement specification " JGJS-2007, is arranged special
People carries out daily nurse, carries out publicity communication to site operation, supervisor, avoids artificial destruction.
A kind of closed precipitation environmental protection and energy saving construction technology of above-mentioned deep basal pit, in the step (1), cement should examine conjunction
Lattice, slurries should remain a constant speed stirring before use, and holding time is more than that 2h should reduce label use, work as generation in the construction process
Slurries interrupt supply, technique interval, in order to prevent broken pile, need to be reduced to stirring-head and stop starching 0.5m below position, wait slurries extensive
Pile, adjacent two lap of splice >=100m are further continued for after multiple supply, construction interval is no more than 12h, be such as more than be considered as it is adjacent
Two overlap joint measures carry out piling.
A kind of closed precipitation environmental protection and energy saving construction technology of above-mentioned deep basal pit, in the step (1), water-stop curtain stake diameter
It should be greater than 0.45m, using four-head deep agitation driller, bit diameter 0.5m, water-stop curtain stake is not less than at wall effective thickness
0.3m。
A kind of closed precipitation environmental protection and energy saving construction technology of above-mentioned deep basal pit, in the step (2), can be used 3 with
Reinforcing bar of the upper, diameter greater than 16mm is distributed welding along sectional uniform, and reinforcing bar length should be greater than being equal to 2 times of steel pipes straight when two-sided welding
Diameter.
A kind of above-mentioned deep basal pit closed precipitation environmental protection and energy saving construction technology in the step (4), can be seen by water level
Well logging control recharge amount, i.e., be arranged several water level observation wells around original building, and fixed special messenger's timing observes and records underground
SEA LEVEL VARIATION can reduce recharge amount when level of ground water raising is excessive, otherwise should increase recharge amount, make around inhering architecture
Level of ground water keeps basicly stable before and after taking out filling.
A kind of above-mentioned deep basal pit closed precipitation environmental protection and energy saving construction technology in construction, running check site operation
Record；Construction quality inspection method is as follows: after pile driving construction in 3 days, checked with GCO probe GCO, it is main to check that pile body is equal
Even property, should spot-check the 1% of construction stake number, and want minimum 3,7 days after pile driving construction, excavate pile crown using superficial part and checked,
Cutting depth is preferably more than to stop 0.5m under pulp noodle, and the main uniformity checked when stirring and measurement pile body diameter check that quantity will be greatly
In being equal to the 5% of total amount of pile, there is the engineering of strict demand to deformation, should be bored after pile 28 days using two-tube single action sampler
Coring sample makees soil cement intensity inspection, and amount of inspection is the 0.5% of whole construction stake numbers, and should be greater than being equal at 6 points.
A kind of closed precipitation environmental protection and energy saving construction technology of above-mentioned deep basal pit, in step (3), downcast well pipe should be placed in
Simultaneously accomplish vertically, to be higher than at the top of downcast well pipe among nature ground 500mm, Tu Bi and downcast well pipe in wellhole middle position
Gap is disposably filled using gravel and is finished, gravel pack position 1000mm under from shaft bottom to well head, and upper seal uses clay,
One control switch should be set and only control a water pump, downcast well pipe chimney filter deviation post permissible value should be less than chimney filter wall thickness.
A kind of closed precipitation environmental protection and energy saving construction technology of above-mentioned deep basal pit, in the step (4), recharge well tube filter
Part is considered as sufficiently permeable requirement, should be since water-permeable stratum to all setting recharge well casing filters of inverted well bottom of the tube
Pipe, three layers of package of recharge well tube filter external application Dense mesh screen point are tight and tightened with tied silk, inverted well Ying Jinhang before normal use
It rinses, method is pulled water out immediately with deep water pump after filling recharge well casing in a large amount of water fillings to recharge well casing, repeated multiple times
It rinses.
The closed precipitation environmental protection and energy saving construction technology of above-mentioned a kind of deep basal pit, in the step (5), to deep foundation pit construction
Monitoring and the record for carrying out overall process are handled record data application informationization technology, the change of timely research and application data
Change and predict dangerous situation, system meeting automatic alarm, accomplishes to cope in advance, it is ensured that engineering is applied in foundation pit when monitor value is more than early warning value
Work can safely, be normally carried out.
The closed precipitation environmental protection and energy saving construction technology of above-mentioned a kind of deep basal pit, to what is extracted out in base pit dewatering work progress
Underground water is recycled, and is taken and is built weeper drain, sump in foundation pit and build fire cistern, water storage outside foundation pit
Pond stores underground water, takes the interim fire-fighting system of setting, temporary construction water system, live spray dust falling system, automatic
Motor flusher etc. efficiently uses underground water.
A kind of beneficial effect of the closed precipitation environmental protection and energy saving construction technology of deep basal pit of the present invention is this green construction method
Precipitation technology is closed using deep foundation pit construction, long-term a large amount of precipitation is not needed, reduces the influence to environment, foundation pit sealing is sealed
It closes system and foundation pit supporting system combines design and can also reduce Construction Cost.Deep basal pit closes precipitation water-stop curtain
" cement mixing method composite soil nailing wall (soil nailing use steel tube for soil-nail) " is used with foundation pit supporting construction, it is by pattern foundation pit supporting structure knot
Structure and water-seal pile are combined togather, in which: steel tube for soil-nail wall mainly plays support action, and cement mixing method both plays closing drop
Water effect, and the supporting intensity safety stock as soil nail wall by checking this structure there is good supporting and sealing to imitate
Fruit.
This construction technology carries out overall process monitoring to Deep foundation Pit excavation, and application message technology carries out monitoring data
Processing, using professional software or the special network platform, is analyzed and processed daily monitoring data, forms the prison of system
Measured data, when monitor value is more than early warning value, system meeting automatic alarm, facilitates unit in charge of construction's reply in advance to handle, avoids dangerous feelings
Condition occurs, and this monitoring method has the characteristics that timely, accurate, result visualization.
Foundation pit construction operation has been limited in smaller range by this construction technology, reduces earth excavation, base pit dewatering
Workload, while reducing influence of the foundation pit construction to surrounding buildings and environment, it is increasingly strict to environment to meet city
The requirement of protection.
This construction technology takes a variety of recycling measures to base pit dewatering, can sufficiently recycle underground water money
Source has the characteristics that energy saving, water-saving, reduction water pollution and protection environment.
Foundation pit construction operation has been limited in smaller range by this construction technology, reduces earth excavation, base pit dewatering
Workload, while reducing influence of the foundation pit construction to surrounding buildings and environment, it is increasingly strict to environment to meet city
The requirement of protection.
This construction technology takes a variety of recycling measures to base pit dewatering, can sufficiently recycle underground water money
Source has the characteristics that energy saving, water-saving, reduction water pollution and protection environment.
Detailed description of the invention
Fig. 1 is construction flow chart of the invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment elaborates to the present invention.
As shown in Figure 1, a kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit, which is characterized in that including following step
Suddenly,
Water-stop curtain construction
Current multi-head small-diameter deep layer agitation driller has the type of three, four-head to seven, and drilling machine more than four-head exists
More commonly used in the construction of cut-off wall in reservoir reinforcing engineering, relatively thin at wall thickness, water-stop curtain stake herein is used for deep basal pit
It should play the role of sealing effect when engineering, pattern foundation pit supporting structure is also cooperatively played with soil nail wall, water-stop curtain stake diameter should be big
In 0.45m.It is proposed with four-head deep agitation driller SJ4-500 type, bit diameter 0.5m, water-stop curtain stake is at wall effective thickness
Not less than 0.3m.Stir four axis once into the construction technology of wall using two sprays two, this construction technology quality of wall is good, it is high-efficient,
Construction cost is low.Job order: drilling machine is in place → prepare cement slurry → setting slurry amount detection recorder → whitewashing stirring drilling →
Whitewashing stirring promotion → displacement.
Work progress points for attention: cement should examine qualification, and slurries should remain a constant speed stirring before use, and holding time is super
Label use should be reduced by crossing 2h；In the construction process when occur slurries interrupt supply, technique interval, in order to prevent broken pile, need by
Stirring-head, which is reduced to, to stop starching 0.5m below position, is further continued for pile after waiting slurries to restore supply；Two adjacent (stake group) overlap joint length
Degree >=100m, construction interval are no more than 12h, are such as more than to be considered as adjacent two overlap joint measures to carry out piling.
Construction of soil-nailed wall
(1) construction and construction requirement of steel tube for soil-nail
The detailing requiments of steel tube for soil-nail: the outer diameter of steel pipe takes 48mm, wall thickness 3.5mm；In 1/2~1/3 steel pipe of steel pipe inner end
Injected hole is set in the total length section of soil nailing；Slip casting bore dia is 8mm, and a slip casting section should be arranged symmetrically two slip castings
Hole, injected hole outside is using protection hangnail protection.It is welded to connect between every steel tube for soil-nail, to guarantee strength of joint, can be used 3
It is more than root, reinforcing bar of the diameter greater than 16mm along sectional uniform be distributed welding, reinforcing bar length should be greater than being equal to 2 times of steel when two-sided welding
Pipe diameter.
The construction requirement of steel tube for soil-nail: steel tube end part transform as it is cone-shaped, top setting reinforce construction, prevent hammering steel pipe
Deforming tops when construction；The ratio of mud of grouting cement slurry takes 0.5；Grouting pressure should be greater than 0.6MPa, steel pipe top and surrounding
Occur just stopping slip casting when returning slurry phenomenon.
(2) construction requirement of gunite concrete surface layer
Fine aggregate should be less than 3% with medium coarse sand clay content, and the graded broken stone partial size of coarse aggregate should not exceed 10mm, cement
1:4 is taken with the weight ratio of sandstone, sand coarse aggregate ratio takes 50%, and the ratio of mud takes 0.45；Spraying operation should be from bottom to top and suitable according to being segmented
Sequence is constructed, and one secondary control of jet thickness is in 50mm thickness；Spray head answers vertical wall to spray, and keeps the distance of 0.8m or so；It is mixed
Timely water seasoning is wanted after solidifying soil final set；Steel mesh is re-layed after spraying a layer concrete, the reinforcing bar greater than 20mm should be set
Protective layer thickness；When reinforcing bar is connected using overlap welding, fusion length should be greater than 10 times of bar diameters.
Precipitation well construction
(1) process flow: measurement and positioning well point → excavation well head → installation casing → park drilling machine in place → construction drill
→ sand bedding course be backfilling into shaft bottom → well casing install in order → by gravel packing be backfilling into well casing outside → carry out well-flushing →
Water pump, which is placed in well casing and carries out circuit controling switch → draw water trial operation → normal operation → stopping precipitation that draws water, extracts well
Pipe → closing landfill.
(2) it key points for operation and technical requirements: requires according to on-site actual situations and according to the well location of design to each well point
Carry out accurate measurement and positioning；Mud off pore-forming is bored using circulation, protects aperture, mud to prevent aperture landslide that casing is arranged
Pond and spoil disposal ditch may be provided at either side；Borehole cleaning and installation well casing carry out immediately after pore-forming, should grasp the chimney filter of well casing
Partial riding position, it is ensured that be placed in the top/bottom latitude in water-bearing layer, while wanting the filtrates such as populated gravel in well casing and hole
Among wall；Water pumping experiment carries out immediately after water pump installs, and can start normal work after the precipitation requirement that can reach design
Make；Time sight is answered to record well water position situation of change.
Recharge well construction
(1) key points for operation and technical requirements: inverted well is arranged Shi Yingyu dewatering well and keeps one section of opposite distance, in this way may be used
So that the water body of recharge is formed an effective supply curtain, avoids the occurrence of recharge water and flow directly into dewatering well, cause " two well phases
It is logical " the phenomenon that occur.With reference to some engineering experiences, inverted well should be maintained at 6 meters or more at a distance from dewatering well and compare conjunction
It is suitable.
(2) recharge amount adjusts: should adjust in due course recharge amount according to the variation of level of ground water, guarantee to accomplish to take out as far as possible to fill equal
Weighing apparatus, makes level of ground water not generate biggish variation, and prevention leads to foundation pit deformation, building settlement cracking etc. because level of ground water is out of control
Dangerous situation occurs.Recharge amount can be controlled by water level observation well, i.e., several water level observation wells are set around original building, Gu
Determine special messenger's timing and observe and record WATER LEVEL CHANGES, recharge amount can be reduced when level of ground water raising is excessive, otherwise should be increased
Recharge amount makes the level of ground water around inhering architecture keep basicly stable before and after taking out filling.
Monitoring measurement
(1) datum mark, monitoring point laying should be according to following principle: the laying of datum mark should stablize, reliably, it is necessary to assure
It will not be damaged during observation；The laying of monitoring point is answered scientific and reasonable, should be arranged in the key point of internal force and deformation, can
Reflect the virtual condition and variation tendency of monitoring object.
(2) the protection work of going on smoothly in order to ensure monitoring, measuring point is particularly important, datum mark and monitoring point
Safeguard measure should include following requirement: eye-catching warning mark is arranged in datum mark, monitoring location；According to " building deformation
Specifications of surveys " standing procedure of monitoring point is constructed in JGJS-2007, it is ensured that and monitoring point is securely；Special messenger is arranged to carry out
Daily nurse；Publicity communication is carried out to site operation, supervisor, avoids artificial destruction.
This construction technology closes precipitation technology using deep foundation pit construction, does not need long-term a large amount of precipitation, reduces to environment
Influence, foundation pit sealing closed system and foundation pit supporting system, which are combined design, can also reduce Construction Cost.It is deep
Foundation pit closes precipitation water-stop curtain and foundation pit supporting construction using " (soil nailing uses steel pipe to cement mixing method composite soil nailing wall
Soil nailing) ", foundation pit supporting construction and water-seal pile are combined togather by it, in which: steel tube for soil-nail wall mainly plays support action, water
Soil mixing pile not only plays the role of closing precipitation, but also as the supporting intensity safety stock of soil nail wall, by checking this structure
With good supporting and water-stagnating effect.
This construction technology carries out overall process monitoring to Deep foundation Pit excavation, and application message technology carries out monitoring data
Processing, using professional software or the special network platform, is analyzed and processed daily monitoring data, forms the prison of system
Measured data, when monitor value is more than early warning value, system meeting automatic alarm, facilitates unit in charge of construction's reply in advance to handle, avoids dangerous feelings
Condition occurs, and this monitoring method has the characteristics that timely, accurate, result visualization.
Foundation pit construction operation has been limited in smaller range by this technique, reduces the work of earth excavation, base pit dewatering
It measures, while reducing influence of the foundation pit construction to surrounding buildings and environment, it is increasingly strict to environmental protection to meet city
Requirement.
This green construction method takes a variety of recycling measures to base pit dewatering, can sufficiently recycle underground water
Resource has the characteristics that energy saving, water-saving, reduction water pollution and protection environment.
The scope of application studied herein
Suitable for closing on the deep-foundation pit engineering of the buildings such as lake, river and seabeach, geological conditions be saturated soft clay and
The bottom of foundation exists below impermeable stratum, and the environmental conditions such as buildings or structures, road and pipeline are complicated around foundation pit, opens foundation pit
The engineering construction of the restricted requirement of surface subsidence caused by digging and dewatering construction etc..
Basic principle
Deep basal pit green construction method is exactly that foundation pit closing precipitation technology is taken to reduce base pit dewatering amount, takes pit retaining monitoring
Technology guarantees construction safety, and base pit dewatering recovery and utilization technology is taken to make full use of the underground water of precipitation discharge, save water resource,
Reach environmentally protective construction purpose.Concrete principle is as follows:
Deep basal pit closing precipitation refers to the setting closing water sealing structure on the outside of deep basal pit edge, and underground water is effectively prevented
Gear is outside foundation pit, and when construction need to only extract the underground water of sub-fraction static state in foundation pit, and this reduces the pumpings of underground water
Taken amount, the commonly referred to as structure of this closing sealing of foundation pit are water-stop curtain.
The design that deep foundation pit construction closes precipitation cooperates this green construction of support system around foundation pit closing water-stopping system
Technology carries out, sealing requirement when arrangement and method for construction being made not only to have met Construction of Deep Excavation Engineering, but also meets deep foundation pit earthwork digging
Required supporting requirement, guarantees the stabilization in excavation and construction period foundation pit side-wall and ambient enviroment, when reducing foundation pit construction
Yield rainfall relation amount reduces influence of the engineering construction to ambient enviroment and level of ground water, accomplishes energy conservation, water-saving green construction.
Monitoring and the record that overall process is carried out to deep foundation pit construction handle record data application informationization technology,
The variation of timely research and application data simultaneously predicts dangerous situation, accomplishes to cope in advance, it is ensured that in foundation pit engineering construction can safely, normally into
Row.
The underground water extracted out in base pit dewatering work progress is recycled, take built in foundation pit draining it is blind
Ditch, sump and the storage underground water such as fire cistern, reservoir are built outside foundation pit take the interim fire-fighting system of setting, interim
Construction water system, live spray dust falling system, automotive vehicle flusher etc. efficiently use underground water.
Construction technology process and key points for operation
Key points for operation
Water-stop curtain construction
Current multi-head small-diameter deep layer agitation driller has the type of three, four-head to seven, and drilling machine more than four-head exists
More commonly used in the construction of cut-off wall in reservoir reinforcing engineering, relatively thin at wall thickness, water-stop curtain stake herein is used for deep basal pit
It should play the role of sealing effect when engineering, pattern foundation pit supporting structure is also cooperatively played with soil nail wall, water-stop curtain stake diameter should be big
In 0.45m.It is proposed with four-head deep agitation driller SJ4-500 type, bit diameter 0.5m, water-stop curtain stake is at wall effective thickness
Not less than 0.3m.Stir four axis once into the construction technology of wall using two sprays two, this construction technology quality of wall is good, it is high-efficient,
Construction cost is low.Job order: drilling machine is in place → prepare cement slurry → setting slurry amount detection recorder → whitewashing stirring drilling →
Whitewashing stirring promotion → displacement.
Work progress points for attention: cement should examine qualification, and slurries should remain a constant speed stirring before use, and holding time is super
Label use should be reduced by crossing 2h；In the construction process when occur slurries interrupt supply, technique interval, in order to prevent broken pile, need by
Stirring-head, which is reduced to, to stop starching 0.5m below position, is further continued for pile after waiting slurries to restore supply；Two adjacent (stake group) overlap joint length
Degree >=100m, construction interval are no more than 12h, are such as more than to be considered as adjacent two overlap joint measures to carry out piling.
Construction of soil-nailed wall
(1) construction and construction requirement of steel tube for soil-nail
The detailing requiments of steel tube for soil-nail: the outer diameter of steel pipe takes 48mm, wall thickness 3.5mm；In 1/2~1/3 steel pipe of steel pipe inner end
Injected hole is set in the total length section of soil nailing；Slip casting bore dia is 8mm, and a slip casting section should be arranged symmetrically two slip castings
Hole, injected hole outside is using protection hangnail protection.It is welded to connect between every steel tube for soil-nail, to guarantee strength of joint, can be used 3
It is more than root, reinforcing bar of the diameter greater than 16mm along sectional uniform be distributed welding, reinforcing bar length should be greater than being equal to 2 times of steel when two-sided welding
Pipe diameter.
The construction requirement of steel tube for soil-nail: steel tube end part transform as it is cone-shaped, top setting reinforce construction, prevent hammering steel pipe
Deforming tops when construction；The ratio of mud of grouting cement slurry takes 0.5；Grouting pressure should be greater than 0.6MPa, steel pipe top and surrounding
Occur just stopping slip casting when returning slurry phenomenon.
(2) construction requirement of gunite concrete surface layer
Fine aggregate should be less than 3% with medium coarse sand clay content, and the graded broken stone partial size of coarse aggregate should not exceed 10mm, cement
1:4 is taken with the weight ratio of sandstone, sand coarse aggregate ratio takes 50%, and the ratio of mud takes 0.45；Spraying operation should be from bottom to top and suitable according to being segmented
Sequence is constructed, and one secondary control of jet thickness is in 50mm thickness；Spray head answers vertical wall to spray, and keeps the distance of 0.8m or so；It is mixed
Timely water seasoning is wanted after solidifying soil final set；Steel mesh is re-layed after spraying a layer concrete, the reinforcing bar greater than 20mm should be set
Protective layer thickness；When reinforcing bar is connected using overlap welding, fusion length should be greater than 10 times of bar diameters.
5.2.3 precipitation well construction
(1) process flow: measurement and positioning well point → excavation well head → installation casing → park drilling machine in place → construction drill
→ sand bedding course be backfilling into shaft bottom → well casing install in order → by gravel packing be backfilling into well casing outside → carry out well-flushing →
Water pump, which is placed in well casing and carries out circuit controling switch → draw water trial operation → normal operation → stopping precipitation that draws water, extracts well
Pipe → closing landfill.
(2) it key points for operation and technical requirements: requires according to on-site actual situations and according to the well location of design to each well point
Carry out accurate measurement and positioning；Mud off pore-forming is bored using circulation, protects aperture, mud to prevent aperture landslide that casing is arranged
Pond and spoil disposal ditch may be provided at either side；Borehole cleaning and installation well casing carry out immediately after pore-forming, should grasp the chimney filter of well casing
Partial riding position, it is ensured that be placed in the top/bottom latitude in water-bearing layer, while wanting the filtrates such as populated gravel in well casing and hole
Among wall；Water pumping experiment carries out immediately after water pump installs, and can start normal work after the precipitation requirement that can reach design
Make；Time sight is answered to record well water position situation of change.
Recharge well construction
(1) key points for operation and technical requirements: inverted well is arranged Shi Yingyu dewatering well and keeps one section of opposite distance, in this way may be used
So that the water body of recharge is formed an effective supply curtain, avoids the occurrence of recharge water and flow directly into dewatering well, cause " two well phases
It is logical " the phenomenon that occur.With reference to some engineering experiences, inverted well should be maintained at 6 meters or more at a distance from dewatering well and compare conjunction
It is suitable.
(2) recharge amount adjusts: should adjust in due course recharge amount according to the variation of level of ground water, guarantee to accomplish to take out as far as possible to fill equal
Weighing apparatus, makes level of ground water not generate biggish variation, and prevention leads to foundation pit deformation, building settlement cracking etc. because level of ground water is out of control
Dangerous situation occurs.Recharge amount can be controlled by water level observation well, i.e., several water level observation wells are set around original building, Gu
Determine special messenger's timing and observe and record WATER LEVEL CHANGES, recharge amount can be reduced when level of ground water raising is excessive, otherwise should be increased
Recharge amount makes the level of ground water around inhering architecture keep basicly stable before and after taking out filling.
5.2.5 monitoring measurement
(1) datum mark, monitoring point laying should be according to following principle: the laying of datum mark should stablize, reliably, it is necessary to assure
It will not be damaged during observation；The laying of monitoring point is answered scientific and reasonable, should be arranged in the key point of internal force and deformation, can
Reflect the virtual condition and variation tendency of monitoring object.
(2) the protection work of going on smoothly in order to ensure monitoring, measuring point is particularly important, datum mark and monitoring point
Safeguard measure should include following requirement: eye-catching warning mark is arranged in datum mark, monitoring location；According to " building deformation
Specifications of surveys " standing procedure of monitoring point is constructed in JGJS-2007, it is ensured that and monitoring point is securely；Special messenger is arranged to carry out
Daily nurse；Publicity communication is carried out to site operation, supervisor, avoids artificial destruction.
There is no the material for needing to illustrate in this construction technology, plant to be used is needed to be as follows:
Plant table
The control of four-head Deep Mixing Piles Construction quality
The inspection of pile body construction quality should meet related specification regulation.It is specific as follows: in construction, running check scene to apply
Work record；Construction quality inspection method is as follows: after pile driving construction in 3d, checked with GCO probe GCO (N10), it is main to check
Pile body uniformity should spot-check the 1% of construction stake number, and want minimum 3；7d after pile driving construction excavates pile crown using superficial part and carries out
It checks, cutting depth is preferably more than to stop starching 0.5m under (ash) face, the main uniformity checked when stirring and measurement pile body diameter, is checked
Quantity is greater than 5% equal to total amount of pile.There is the engineering of strict demand to deformation, should be taken after pile 28d using two-tube single action
Sample device core boring sampling makees soil cement intensity inspection, and amount of inspection is the 0.5% of whole construction stake numbers, and should be greater than being equal at 6 points.
The control of construction of soil-nailed wall quality
The quality examination of soil nail wall and detection table
Dewatering well and the control of inverted well quality
Downcast well pipe should be placed in wellhole middle position and accomplish vertically, nature ground 500mm to be higher than at the top of well casing；
Gap among Tu Bi and well casing is disposably filled using filtrate to be finished, filtrate filling position 1000mm under from shaft bottom to well head,
Upper seal uses clay (being free of sandstone)；One control switch should be set and only control a water pump；Chimney filter deviation post allows
Value should be less than filtering
Thickness of pipe wall.
The chimney filter part of inverted well is considered as sufficiently permeable requirement, should be complete to well casing bottom since water-permeable stratum
Chimney filter is arranged in portion.Three layers of package of chimney filter external application Dense mesh screen point are tight and tightened with tied silk, prevent silt from blocking chimney filter.Inverted well exists
It should be rinsed before normal use, method is in a large amount of water fillings to recharge well casing, immediately with deep water pump by water after filling well casing
Extraction, it is repeated multiple times to rinse the recharge efficiency that inverted well can be improved.
Detecting instrument equipment and calibrating require
Detecting instrument equipment used in this engineering monitoring project is as follows:
Detecting instrument equipment
Primary safety measures
When four-head deep agitation driller occur bit freezing or stop bore when, should suspend benefit slurry increase clear water circulation, etc. accident treatments
Afterwards, then add slurry stirring；When network voltage is lower than rated operational voltage when ram machine construction, suspension of works is answered；Slurries transfer pipeline
It to be moistened before conveying；In construction when the faulty downtime of stake machine is more than 30 minutes, the mortar in pipeline should be discharged in time,
Prevent slurries from hardening blocking pipeline；Pump for mortar transmission will cleaning maintenance on time；When place is softer, smooth rammer should be carried out to place
Crucial point reason.Construction site should be equipped with dual power supply, it is ensured that not power off in Precipitation Process；Answer the leakproofness of regular check cable, it is ensured that
The safe and reliable leakproof of cable；Strict safety operating instruction forbids violation hot line job；In Precipitation Process, it should arrange
Full-time electrician is on duty for 24 hours；Submersible pump cable should be replaced with new cable, it is ensured that leakproof.
Main environmental protection measure
Project management department sets up special environment and supervises leading organ, strictly observes country and place in relation to environmentally friendly law, method
Rule etc. reinforce management and effectively control to the waste water,waste gas and industrial residue of engineering, fugitive dust and production and living rubbish.Accomplish field of constructing
Ground is standardized and orderly, and enclosing is strictly arranged as required, various marks
Board, safety signs are complete, site safety civilized construction.Scene setting plasma discharge ditch sum aggregate starch hole etc., to waste water,
Waste pulp carry out rationally effective recycling and concentrate storage, accomplish that environmental soundization is handled, and prevent the mud environment of sinuous flow pollution everywhere；
The production and living rubbish appointed place at scene is concentrated and is stacked, garbage disposal center is periodically cleared and carries out harmless treatment；It applies
Antiseepage drain process is carried out when the storages such as oil product, chemicals in work scene, prevents leakage pollution surrounding soil；More than 100 people's
Staff canteen will build simple effective oil separator；Site road should accomplish cure process, periodically clean in addition to rainy weather
Watering, prevents dusty；The machinery that construction machinery should select environmental protection, noise small, while sound insulation and noise reduction measure appropriate is taken,
And night work requirement is abided by, prevents construction noise from influencing surrounding resident.
Economic and Efficiency Analysis
The comparison of excavation of foundation pit earth volume
Using light-duty well-points dewatering construction scheme, foundation pit is equipped with level-one well point and second level well point, and when earth excavation will consider
The face width of slope and second level well point, earth excavation amount is big, and be computed an area and two area's foundation pits needs earth excavation about altogether
85365m3；Using green construction engineering method arrangement and method for construction, more than level of ground water excavated using slope, using vertical below level of ground water
Straight to excavate, be computed an area and two area's foundation pits needs earth excavation about 76838m3 altogether.Therefore, using green construction engineering method arrangement and method for construction
Earth excavation about 8526m3 can be reduced, nearly 10% earth excavation operating expenses expenditure can be saved.
The comparison of base pit dewatering construction cost
(1) it see the table below using light-duty well-points dewatering construction scheme main project cost calculated result:
Light-duty well-points dewatering construction scheme cost calculates
(2) it see the table below using green construction engineering method arrangement and method for construction main project cost calculated result:
Deep foundation pit precipitation green construction method arrangement and method for construction cost calculates
Two, steel tube for soil-nail wall
(3) by calculating it is found that green construction engineering method arrangement and method for construction can save 982529.09 yuan, and further comprise base
The expense for cheating supporting, greatly reduces construction cost.
Base pit dewatering recycles Economic and Efficiency Analysis
The water resource in vehicle auto-flushing and tower crane spray dust is recycled emphatically herein and carries out economic benefit point
Analysis.
(1) the vehicle auto-flushing amount of conserving water needs earth excavation 76838m3 by green construction engineering method arrangement and method for construction, foundation pit,
By per car dress 25m3 soil, need to use vehicle 3074 times, each car rinse water 0.5m3, water consumption adds up to 1536m3.
(2) the tower crane spray dust amount of conserving water
By this process program, tower crane is arranged 16 spray nozzles, and each spray head is sprayed water 0.03m3 every time, spray five times daily,
Basis and basement construction 100 days, altogether need to water 240m3 (note: use in foundation pit sump collect rainwater and water-stop curtain zero
Star leak).
Above two are recycled and are recycled base pit dewatering 1776m3, by 4 yuan/m3 water calculation of price, can be saved water
7104 yuan of expense.
Social benefit analysis
Pass through comparison: earth excavation about 8526m3 can be reduced using this technique, make foundation pit construction range shorter, reduce construction
Influence to ambient enviroment and building.Pass through comparison: using light-duty well-points dewatering construction scheme, the daily precipitation of area's foundation pit
Amount is 1638.93m3, and the daily precipitation of two area's foundation pits is 1743.47m3, basement construction finish precipitation stop total construction period be
150d, foundation pit gross precipitation are as follows: (1638.93+1743.47) × 150=507360m3；Using green construction engineering method construction party
Case, the total precipitation of area's foundation pit are 2570m3, and the total precipitation of two area's foundation pits is 3090m3, add up to gross precipitation are as follows:
5660m3.By comparison, precipitation 501700m3 can be reduced using green construction engineering method arrangement and method for construction, save groundwater resources effect
Fruit is significant.By comparison, this technique can significantly reduce deep foundation pit precipitation project cost, reduce social funds and every resource
Investment.
This technique is suitable for closing on the deep-foundation pit engineering of the buildings such as lake, river and seabeach, and geological conditions is to be saturated soft glue
The native and bottom of foundation exists below impermeable stratum, and the environmental conditions such as buildings or structures, road and pipeline are complicated around foundation pit, right
The engineering construction of the restricted requirement of surface subsidence caused by excavation of foundation pit and dewatering construction etc..
It effectively reduces project cost, reduce influence of the engineering construction to ambient enviroment, fresh-water-saving resource, and combine
The implementation of pit retaining monitoring technology, ensure that engineering construction safety, reach energy saving, water-saving, protection environment and safety construction
Green construction purpose.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, the art
The variations, modifications, additions or substitutions made within the essential scope of the present invention of those of ordinary skill, also should belong to the present invention
Protection scope.
Claims (10)
1. a kind of closed precipitation environmental protection and energy saving construction technology of deep basal pit, which is characterized in that include the following steps,
(1), water-stop curtain is constructed: drilling machine is in place, prepares cement, and setting slurry amount detects record, whitewashing stirring drilling, whitewashing stirring
It mentions, shifts；
(2), construction of soil-nailed wall:
A, the detailing requiments of steel tube for soil-nail: the outer diameter of steel pipe takes 48mm, wall thickness 3.5mm；1/2~1/3 steel pipe soil in steel pipe inner end
Injected hole is set in the total length section of nail；Slip casting bore dia is 8mm, and a slip casting section should be arranged symmetrically two injected holes,
It is protected outside injected hole using protection hangnail, is welded to connect between every steel tube for soil-nail；
B, the construction requirement of steel tube for soil-nail: steel tube end part transform as it is cone-shaped, top setting reinforce construction, prevent hammering steel pipe apply
Working hour deforming tops, the ratio of mud of grouting cement slurry take 0.5, and grouting pressure should be greater than 0.6MPa, and steel pipe top and surrounding are wanted
Appearance just stops slip casting when returning slurry phenomenon；
C, the construction requirement of gunite concrete surface layer: fine aggregate should be less than 3% with medium coarse sand clay content, and the gradation of coarse aggregate is broken
Stone grain diameter should not exceed 10mm, and the weight ratio of cement and sandstone takes 1:4, and sand coarse aggregate ratio takes 50%, and the ratio of mud takes 0.45, and spraying operation is answered
It constructs from bottom to top and according to striping order, one secondary control of jet thickness is in 50mm thickness；Spray head answers vertical wall to spray,
Keep the distance of 0.8m or so；Timely water seasoning is wanted after concrete final set；Steel mesh is re-layed after spraying a layer concrete,
Thickness of protection tier greater than 20mm should be set；When reinforcing bar is connected using overlap welding, it is straight that fusion length should be greater than 10 times of reinforcing bars
Diameter；
(3), it precipitation well construction: requires accurately to measure each well point according to on-site actual situations and according to the well location of design
Positioning bores mud off pore-forming using circulation, and setting casing protects aperture, and mud pit and spoil disposal ditch may be provided at either side,
Borehole cleaning and installation downcast well pipe carry out immediately after pore-forming, and downcast well pipe chimney filter is partially disposed in the top/bottom latitude in water-bearing layer,
Want populated filtrate among downcast well pipe and hole wall simultaneously, water pumping experiment carries out immediately after water pump installs, when can reach
It can start to work normally after to the precipitation requirement of design, time sight is answered to record well water position situation of change；
(4), recharge well construction:
A, inverted well are arranged Shi Yingyu dewatering well and keep one section of opposite distance, and inverted well should be maintained at 6 at a distance from dewatering well
Meter or more；
B should adjust in due course recharge amount according to the variation of level of ground water, take out to fill and balance each other；
(5), monitoring measurement:
A, datum mark, monitoring point laying should be according to following principle: the laying of datum mark should stablize, reliably, during observation not
It can be damaged, monitoring point is arranged in the key point of internal force and deformation, and the virtual condition and variation for being able to reflect monitoring object become
Gesture；
The safeguard measure of b, datum mark and monitoring point should include following requirement: eye-catching in datum mark, monitoring location setting
Warning mark is constructed according to the standing procedure of monitoring point in " building deformation measurement specification " JGJS-2007, arrange special messenger into
The daily nurse of row, carries out publicity communication to site operation, supervisor, avoids artificial destruction.
2. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that the step
Suddenly in (1), cement should examine qualification, and slurries should remain a constant speed stirring before use, and holding time is more than that 2h should reduce label and make
With, in the construction process when occur slurries interrupt supply, technique interval, in order to prevent broken pile, stirring-head need to be reduced to and stop starching
0.5m below position, is further continued for pile, adjacent two lap of splice >=100m after waiting slurries to restore supply, construction interval is no more than
12h is such as more than to be considered as adjacent two overlap joint measures to carry out piling.
3. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that the step
Suddenly in (1), water-stop curtain stake diameter should be greater than 0.45m, using four-head deep agitation driller, bit diameter 0.5m, water-stop curtain stake
It is not less than 0.3m at wall effective thickness.
4. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that the step
Suddenly in (2), can be used 3 or more, reinforcing bar of the diameter greater than 16mm along sectional uniform be distributed welding, reinforcing bar length when two-sided welding
It should be greater than being equal to 2 times of diameter of steel tube.
5. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that the step
Suddenly in (4), recharge amount can be controlled by water level observation well, i.e., several water level observation wells is set around original building, it is fixed special
People's timing observes and records WATER LEVEL CHANGES, can reduce recharge amount when level of ground water raising is excessive, otherwise should increase recharge
Amount makes the level of ground water around inhering architecture keep basicly stable before and after taking out filling.
6. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 3, characterized in that construction
In, running check site operation to record；Construction quality inspection method is as follows: after pile driving construction in 3 days, with GCO probe GCO into
Row checks, main to check pile body uniformity, should spot-check the 1% of construction stake number, and want minimum 3,7 days after pile driving construction, uses
Superficial part excavates pile crown and is checked that cutting depth is preferably more than to stop 0.5m under pulp noodle, the main uniformity and measurement checked when stirring
Pile body diameter, checks that quantity is greater than 5% equal to total amount of pile, has the engineering of strict demand to deformation, should after pile 28 days,
Soil cement intensity inspection is made using two-tube single action sampler core boring sampling, amount of inspection is the 0.5% of whole construction stake numbers, and is answered
More than or equal to 6 points.
7. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that step
(3) in, downcast well pipe should be placed in wellhole middle position and accomplish vertically, nature ground to be higher than at the top of downcast well pipe
Gap among 500mm, Tu Bi and downcast well pipe is disposably filled using gravel to be finished, and gravel pack position is from shaft bottom to well head
Lower 1000mm, upper seal use clay, a control switch should be arranged and only control a water pump, downcast well pipe chimney filter bits of offset
Setting permissible value should be less than chimney filter wall thickness.
8. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that the step
Suddenly in (4), recharge well tube filter part is considered as sufficiently permeable requirement, should be since water-permeable stratum to inverted well tube bottom
All setting recharge well tube filter, recharge well tube filter external application Dense mesh screen divide three layers of package tight and are tightened with tied silk, recharge in portion
Well should be rinsed before normal use, and method is in a large amount of water fillings to recharge well casing, immediately with deep after filling recharge well casing
Water pump pulls water out, repeated multiple times flushing.
9. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that the step
Suddenly in (5), monitoring and the record of overall process are carried out to deep foundation pit construction, and record data application informationization technology is handled,
The variation of timely research and application data simultaneously predicts dangerous situation, and when monitor value is more than early warning value, system meeting automatic alarm, accomplishes to shift to an earlier date
Reply, it is ensured that in foundation pit engineering construction can safely, be normally carried out.
10. the closed precipitation environmental protection and energy saving construction technology of a kind of deep basal pit according to claim 1, characterized in that base
Hole dewatering construction during extract out underground water be recycled, take built in foundation pit weeper drain, sump and
Fire cistern, reservoir storage underground water are built outside foundation pit, are taken the interim fire-fighting system of setting, temporary construction water system, are showed
Field spray dust falling system, automotive vehicle flusher efficiently use underground water.
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Application publication date: 20191022 |