CN106245663A - A kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river - Google Patents
A kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river Download PDFInfo
- Publication number
- CN106245663A CN106245663A CN201610737795.3A CN201610737795A CN106245663A CN 106245663 A CN106245663 A CN 106245663A CN 201610737795 A CN201610737795 A CN 201610737795A CN 106245663 A CN106245663 A CN 106245663A
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- Prior art keywords
- water
- foundation ditch
- river
- cofferdam
- construction
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
Abstract
The present invention provides a kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river, belongs to Excavation Construction field.The method is to excavate foundation ditch at neighbouring riverside, construction make-up pump room base component and main part in foundation ditch, mainly include the cofferdam waterstop construction before foundation ditch excavation, use and slow down slope mode and excavate in foundation ditch and foundation ditch mining process the process present invention of infiltration and carry out cofferdam sealing by high-pressure rotary-spray concrete water-seal pile mode, use multi-stage platform to slow down slope mode and excavate foundation ditch, and employing arranges plash and bright for hydrops row extraction mode outside the venue carries out the process of hydrops in foundation ditch mining process, disclosure satisfy that the demand that make-up pump foundations hole is excavated along the river, sealing and dewatering effect are good, and it is short to have the duration, the advantage that engineering cost is low.
Description
[technical field]
The present invention relates to Excavation Construction field, be specifically related to a kind of make-up water pump house cofferdam preventing leaking water engineering along the river
Construction method.
[background technology]
When building make-up water pump house, possible addressing is just proximate to riverside or the river bank at water source, in this case, construction
Time will increase the working procedure of cofferdam sealing.At present, the foundation ditch that neighbouring water source excavation pit uses drops, sealing construction mode master
Want as follows:
1, first setting soil blocking pile part, its effect primarily serves the effect of retaining wall, and form has deposited reinforced concrete pile
Or the stake of other form, there is certain space between stake and stake, but soil can be kept off；Then setting water-stop curtain part, its effect is
Making the soil solidifying after retaining wall, block the water layer exchange inside and outside foundation ditch, form is probably cement mixing method or densification note
Slurry；It is finally to support；Use the method the most long in time limit, and construction costs is high, makes cost bigger.
2, two-stage dewatering well is set between diaphram wall and water source, first uses the outer two-stage dewatering well of foundation ditch to reduce foundation ditch
Level of ground water around, carries out construction of diaphragm wall the most again, finally carries out blood pressure lowering in precipitation, excavation of foundation pit, foundation ditch in foundation ditch.
Adopting premise in this way is water source and foundation ditch has a certain distance to require (not to be suitable for water source and less deep of foundation ditch distance
Base pit engineering), working procedure is more, and well-point pipe is arranged more, and cost is bigger.
Although above two method can meet the fall of deep foundation pit construction, sealing requirement, but, it is higher to construction requirement,
Engineering cost is excessive, and the sealing ability of latter is more weak.
[summary of the invention]
The goal of the invention of the present invention is: for the problem of above-mentioned existence, it is provided that a kind of make-up water pump house cofferdam along the river is only
Hydraulic Projects construction method, the method for the present invention can be greatly shortened the construction period, and significantly reduce construction cost.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river, is to excavate foundation ditch, at foundation ditch at neighbouring riverside
Interior construction make-up pump room base component and main part, the cofferdam waterstop construction before excavating including foundation ditch, employing is slowed down
Slope mode excavates the process of infiltration in foundation ditch and foundation ditch mining process, particularly as follows:
(1) high-pressure rotary-spray concrete water-seal pile mode is used to form a circle continuous print sealing curtain in the construction of region to be dug surrounding
Curtain, the degree of depth of water-stop curtain extend into foundation ditch and presets below bottom excavation face；
(2) use stay the platform of more than two-stage slow down slope digging mode excavate foundation ditch, first in region to be excavated, from
The ground of certain distance is not excavated along the river, as first order platform, at first order platform edges to regional center to be excavated
Direction is slowed down slope and is excavated, and forms the first gentle slope；After first gentle slope has been excavated, carry out next stage platform successively and next delays
Alternately excavating until reaching the bottom that foundation ditch is preset of slope；Wherein, the ratio of slope on each gentle slope is respectively less than 1:1；
(3), during foundation ditch excavates, when infiltration situation occurs, use and plash is set and extracts bright for hydrops row out field
Outer mode processes.
More preferably, the stake footpath of described concrete water-seal pile is 500mm, and pile center's spacing is 0.35m, is formed between stake and stake
The continuous water-stop curtain of engaged 150mm；Thus play the purpose that foundation pit construction region is carried out water proof.
More preferably, it is double that described concrete water-seal pile backfills part in side near a river and upstream and downstream, and its lap is single cloth
Put.Arrange by carrying out high hydraulic pressure part reinforcing, the hydraulic pressure lateral pressure to side slope along the river can not only be reduced, prevent from excavating
Deeply, form potential safety hazard, make also to have preferably antiseep effect.
More preferably, described water-stop curtain extend into foundation ditch and presets below bottom excavation face at least 0.5m, the top of water-stop curtain
Portion and the vertical dimension at least 2.5 meters of river surface.
More preferably, the cement mortar making described concrete water-seal pile uses the portland cement of PO42.5 level, slurry water ash
Ratio is 1:1, and Water glass content presses 3.43% admixture of cement consumption, and cement consumption is 455kg/m3.The cement mortar tool of this proportioning
Having solidification fast, intensity is high, the advantage of good waterproof performance, meets the requirement of present invention construction.
More preferably, the width of second level platform is more than 2.5m, in practice of construction two grades of platforms may more than 4 meters, with
The movement and the running that meet construction machinery are as the criterion, and the width of platform is the widest, can alleviate the lateral pressure reducing side slope, prevent out
Dug deep, formed potential safety hazard, and it also had certain supporting role to water-stop curtain, reduced surrounding subsoil water and river to only
The lateral pressure of water curtain.
More preferably, the width of first order platform is more than 2.0m, and principle is with second level platform.
More preferably, described high-pressure rotary-spray concrete water-seal pile uses three tube method churnings.Three tube method churnings are a kind of water, gas blowouts
Penetrate, slurry filling stirring mixing jetting method.I.e. make high pressure water and air transverse injection simultaneously with triple injection pipe, and cut
Foundation soil body, the climbing power by means of air is got rid of the soil being broken by earth's surface；Simultaneously, another nozzle is by cement mortar low pressure
Power injection is injected in ground cut, that stir, makes cement mortar mix with soil and reaches to reinforce purpose.The three tube method suitabilitys are wide,
May be used for any soil layer, and it is fast to have construction, the high advantage with low cost of mechanization degree.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: the present invention passes through high-pressure rotary-spray
Concrete water-seal pile mode carries out cofferdam sealing, uses multi-stage platform to slow down slope mode and excavates foundation ditch, and at foundation ditch mining process
Middle employing arranges plash and bright for hydrops row extraction mode outside the venue carries out the process of hydrops, it is possible to meet make-up pump along the river
The demand that foundations hole is excavated, sealing and dewatering effect are good, and have the advantage that the duration is short, engineering cost is low.
[accompanying drawing explanation]
Fig. 1 is the engineering schematic diagram using the method for the present invention to carry out hundred ore deposit power plant for self-supply of group make-up water pump house construction.
Wherein 1-horizontal plane, 2-first order platform, 3-the first gentle slope, 4-second level platform, 5-the second gentle slope, the 6-third level
Platform, 7-the 3rd gentle slope, 8-foundation ditch presets bottom, 9-water-seal pile.
[detailed description of the invention]
In order to more clearly express the present invention, below by way of specific embodiment, the invention will be further described.
The present invention provides a kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river, is to excavate base at neighbouring riverside
Hole, construction make-up pump room base component and main part in foundation ditch, the cofferdam waterstop construction before excavating including foundation ditch,
Employing is slowed down slope mode and is excavated the process of infiltration in foundation ditch and foundation ditch mining process, particularly as follows:
(1) high-pressure rotary-spray concrete water-seal pile mode is used to form a circle continuous print sealing curtain in the construction of region to be dug surrounding
Curtain, the degree of depth of water-stop curtain extend into foundation ditch and presets below bottom excavation face；
(2) use stay the platform of more than two-stage slow down slope digging mode excavate foundation ditch, first in region to be excavated, from
The ground of certain distance is not excavated along the river, as first order platform, at first order platform edges to regional center to be excavated
Direction is slowed down slope and is excavated, and forms the first gentle slope；After first gentle slope has been excavated, carry out next stage platform and next stage successively
Alternately excavating until reaching the bottom that foundation ditch is preset of gentle slope；Wherein, the ratio of slope on each gentle slope is respectively less than 1:1；
(3), during foundation ditch excavates, when infiltration situation occurs, use and plash is set and extracts bright for hydrops row out field
Outer mode processes.
As some embodiments of the present invention, the stake footpath of concrete water-seal pile be 500mm or more than, pile center's spacing is
0.35m, forms the continuous water-stop curtain of engaged 150mm between stake and stake.
As some embodiments of the present invention, it is double that concrete water-seal pile backfills part in side near a river and upstream and downstream, its
Lap is single layout.
As some embodiments of the present invention, described water-stop curtain extend into foundation ditch and presets below bottom excavation face at least
0.5m, the top of water-stop curtain and the vertical dimension of river surface at least 2.5 meters.
As some embodiments of the present invention, the cement mortar making described concrete water-seal pile uses the silicic acid of PO42.5 level
Salt cement, slurry water gray scale is 1:1, and Water glass content presses 3.43% admixture of cement consumption, and cement consumption is 455kg/m3。
As some embodiments of the present invention, the width of second level platform is more than 2.5m, two grades of platforms in practice of construction
May be as the criterion with the movement and running meeting construction machinery, and the width of platform is the widest more than 4 meters, reduction limit can be alleviated
The lateral pressure on slope, prevents from excavating deeply, forms potential safety hazard, and it also has certain supporting role to water-stop curtain, reduces four
All subsoil water and the river lateral pressure to water-stop curtain.
As some embodiments of the present invention, the width of first order platform is more than 2.0m.
As some embodiments of the present invention, high-pressure rotary-spray concrete water-seal pile uses three tube method churnings.
Below as a example by the arrangement and method for construction of hundred ore deposit power plant for self-supply of group make-up water pump houses, the present invention is described in further detail
Explanation.
Hundred ore deposit power plant for self-supply of group make-up water pump houses are positioned at the west side of power plant's coal yard, near river bank, the Youjiang River.As it is shown in figure 1,
Original landforms nature elevation is 111.6m, and substrate absolute altitude is 94.7m, and design foundation ditch floor space is about 553, maximum cutting depth
16.9m, is 100m according to the water level elevation in on-the-spot right river, be equivalent to the substrate absolute altitude of make-up water pump house less than the river bank water surface-
5.3m, so the difficulty of construction of this engineering is the construction of water-retaining cofferdam sealing along the river, owing to soil property situation is drifting sand layer herein
And sand pebble layer, subsoil water is abundanter, adds bigger difficulty to the construction of water-retaining cofferdam is invisible.
Embodiment 1
As this engineering uses conventional water-stop curtain way, the i.e. first step to be soil blocking pile parts, its effect primarily serves gear soil
The effect of wall, form has the stake of deposited reinforced concrete pile or other form, has certain space, but can keep off between stake and stake
Soil.Second step is water-stop curtain part, and its effect is the soil solidifying after retaining wall, blocks the water layer exchange inside and outside foundation ditch,
Form is probably cement mixing method or compaction grouting.3rd step is to support.If implementing by this conventional scheme:
1, estimate and need to increase by 100Reinforced concrete revetment pile, the degree of depth about 12m, based on 800 yuan/m of unit price,
This soil blocking pile engineering need to invest 960,000 yuan, and implementing this engineering needs the duration 30 days.
2, Part II is to do water-stop curtain, uses slope protection pile+spray mixing pile (high-pressure rotary jet grouting pile) to be collectively forming cut-pff wall
Water-stop curtain mode, after arrangement is slope protection pile construction, arranges a spray mixing pile (high-pressure rotary-spray between each two slope protection pile
Stake), stir spray spray stake engaged with slope protection pile, formation combination against seepage wall.This engineering estimates increase engineering cost about 1,000,000
Unit, implementing this engineering needs the duration 30 days.
3, earth excavation engineering: after carrying out soil blocking pile and water-stop curtain, can use the digging mode putting abrupt slope, puts the slope gradient
By 1:0.6, reduce the excavated volume of the earthwork, the quantities of earth excavation about 20000m3, by 12 yuan/m of unit price3Meter, this engineering is thrown
Rate with 240,000 yuan, 5 days durations.
4, earth excavation side slope shotcrete with steel bar nets close, quantities about 2500, by unit price 200 yuan/based on, this side slope is propped up
Nurse's journey need to invest 500,000 yuan, 7 days construction periods.
By such scheme, the cofferdam preventing leaking water engineering accumulative investment about 2,700,000 yuan along the river of make-up water pump house, construction period need 72
My god.
Embodiment 2
1, triple-pipe high pressure jet grouting concrete water-seal pile mode is used to form a circle continuous print in the construction of region to be dug surrounding
Water-stop curtain, quantities is 500Concrete-pile, pile length about 8.8 meters, pile center's spacing is 0.35m, formed stake with
The continuous water-stop curtain of engaged 150mm between Zhuan；The degree of depth of water-stop curtain extend into foundation ditch and presets below bottom excavation face
0.5m, the top of water-stop curtain and the vertical dimension of river surface are 3 meters；Concrete water-seal pile backfills part in side near a river and upstream and downstream
For double, its lap is single layout.The cement mortar making described concrete water-seal pile uses the portland cement of PO42.5 level,
Slurry water gray scale is 1:1, and Water glass content presses 3.43% admixture of cement consumption, and cement consumption is 455kg/m3.This engineering
Needing investment cost 1,000,000 yuan, the duration needs 45 days.
2 as it is shown in figure 1, use the digging mode staying Three-level Platform to slow down slope to excavate foundation ditch, first in region to be excavated
Interior, the ground of limit, Lijiang River certain distance is not excavated, and as first order platform 2, the width of first order platform 2 is 2.5m,
First order platform 2 edge slows down slope to regional center direction to be excavated and excavates, and forms the first gentle slope 3；First gentle slope 3 is excavated
After completing, carry out the excavation of the excavation on second level platform the 4, second gentle slope 5, third level platform the 6, the 3rd gentle slope 7 successively；Finally reach
Bottom 8 is preset to foundation ditch；Wherein, the ratio of slope on the first gentle slope 3 is 1:1.5, and the ratio of slope on the second gentle slope 5 and the 3rd gentle slope 7 is
1:1；The width of first order platform 2 is 2m, and the width of second level platform 4 is 3m, and the width of third level platform 6 is 2m.This work
The volume of earthwork of journey excavation is about 30000m3, by 12 yuan/m of unit price3Meter, this engineering investment cost 360,000 yuan, the construction period
10 days.
3, during foundation ditch excavates, when infiltration situation occurs, use and plash is set and extracts bright for hydrops row out field
Outer mode processes, and this expense is less than 10,000.
By the arrangement and method for construction of embodiment 2, the cofferdam preventing leaking water engineering accumulative investment about 1,370,000 yuan along the river of make-up water pump house, work
55 days phases.
Therefore, using the arrangement and method for construction of the present invention, engineering economy investment cost 1,330,000 yuan, the duration shortens 17 days, obtains bright
Aobvious effect, prominent contribution is made in the completion on time for power plant for self-supply's water system.
Described above is the detailed description for the preferable possible embodiments of the present invention, but embodiment is not limited to this
Bright patent claim, the equal change completed under the technical spirit suggested by all present invention or modification change, all should belong to
In the contained the scope of the claims of the present invention.
Claims (8)
1. make-up water pump house cofferdam, a riverside preventing leaking water engineering construction method, is to excavate foundation ditch, in foundation ditch at neighbouring riverside
Construction make-up pump room base component and main part, it is characterised in that include the cofferdam waterstop construction before foundation ditch excavation,
Employing is slowed down slope mode and is excavated the process of infiltration in foundation ditch and foundation ditch mining process, particularly as follows:
(1) high-pressure rotary-spray concrete water-seal pile mode is used to form a circle continuous print water-stop curtain in the construction of region to be dug surrounding,
The degree of depth of water-stop curtain extend into foundation ditch and presets below bottom excavation face；
(2) digging mode staying the platform of more than two-stage to slow down slope is used to excavate foundation ditch, first in region to be excavated, limit, the Lijiang River
The ground of certain distance is not excavated, as first order platform, at first order platform edges to regional center direction to be excavated
Slow down slope to excavate, form the first gentle slope；After first gentle slope has been excavated, carry out next stage platform and next gentle slope successively
Alternately excavate until reaching the bottom that foundation ditch is preset；Wherein, the ratio of slope on each gentle slope is respectively less than 1:1；
(3), during foundation ditch excavates, when infiltration situation occurs, use and plash is set and bright for hydrops row is extracted out outside the venue
Mode processes.
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: described
The stake footpath of concrete water-seal pile is 500mm, and pile center's spacing is 0.35m.
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: described
It is double that concrete water-seal pile backfills part in side near a river and upstream and downstream, and its lap is single layout.
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: described
Water-stop curtain extend into foundation ditch and presets below bottom excavation face at least 0.5m, and the top of water-stop curtain is with the vertical dimension of river surface extremely
Few 2.5 meters.
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: make
The cement mortar of described concrete water-seal pile uses the portland cement of PO42.5 level, and slurry water gray scale is 1:1, and Water glass content is pressed
3.43% admixture of cement consumption, cement consumption is 455kg/m3。
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: foundation ditch
During excavation, the width of the second level platform dug is more than 2.5m.
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: first
The width of level platform is more than 2.0m.
Cofferdam water-stopping method in neighbouring Excavation Process along the river the most according to claim 1, it is characterised in that: described
High-pressure rotary-spray concrete water-seal pile uses three tube method churnings.
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| CN201610737795.3A CN106245663A (en) | 2016-08-26 | 2016-08-26 | A kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river |
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| CN201610737795.3A CN106245663A (en) | 2016-08-26 | 2016-08-26 | A kind of make-up water pump house cofferdam preventing leaking water engineering construction method along the river |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000303467A (en) * | 1999-04-19 | 2000-10-31 | Takenaka Komuten Co Ltd | Self-sustaining earth retaining wall and self-sustaining earth retaining wall construction method |
| CN101892668A (en) * | 2010-07-30 | 2010-11-24 | 中铁四局集团第六工程有限公司 | Combined support-excavated geologically solutional deep foundation pit and construction method thereof |
| CN102011404A (en) * | 2010-11-24 | 2011-04-13 | 温州中城建设集团有限公司 | Pit supporting structure and construction method thereof |
| CN102561362A (en) * | 2011-12-31 | 2012-07-11 | 青建集团股份公司 | Construction method for foundation pit supporting by dynamic compaction replacement of muddy soil |
| CN105544576A (en) * | 2016-01-20 | 2016-05-04 | 山东科技大学 | Foundation ditch dewatering and drainage excavation structure and application method |
-
2016
- 2016-08-26 CN CN201610737795.3A patent/CN106245663A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000303467A (en) * | 1999-04-19 | 2000-10-31 | Takenaka Komuten Co Ltd | Self-sustaining earth retaining wall and self-sustaining earth retaining wall construction method |
| CN101892668A (en) * | 2010-07-30 | 2010-11-24 | 中铁四局集团第六工程有限公司 | Combined support-excavated geologically solutional deep foundation pit and construction method thereof |
| CN102011404A (en) * | 2010-11-24 | 2011-04-13 | 温州中城建设集团有限公司 | Pit supporting structure and construction method thereof |
| CN102561362A (en) * | 2011-12-31 | 2012-07-11 | 青建集团股份公司 | Construction method for foundation pit supporting by dynamic compaction replacement of muddy soil |
| CN105544576A (en) * | 2016-01-20 | 2016-05-04 | 山东科技大学 | Foundation ditch dewatering and drainage excavation structure and application method |
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Application publication date: 20161221 |