CN106801424B - A kind of cofferdam construction method - Google Patents
A kind of cofferdam construction method Download PDFInfo
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- CN106801424B CN106801424B CN201710033606.9A CN201710033606A CN106801424B CN 106801424 B CN106801424 B CN 106801424B CN 201710033606 A CN201710033606 A CN 201710033606A CN 106801424 B CN106801424 B CN 106801424B
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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
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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Abstract
The invention discloses a kind of cofferdam construction methods, comprising the following steps: construct before preparations, site clearing, cofferdam unwrapping wire, beat timber, build weir mention, fill weir body, cofferdam protection processing, cofferdam completion after cleaning, construction after detect, backfilling of earthwork control；It is good with dense effect, the waterproof effect in cofferdam is improved, finds to improve the effect of cofferdam construction quality and safety when situation convenient for taking emergency measures in time.
Description
Technical field
The present invention relates to water conservancy construction technical fields, more specifically, it relates to a kind of cofferdam construction method.
Background technique
Cofferdam refers in hydraulic engineering construction, for the permanent water conservancy projects of construction, the provisional building enclosure built,
Effect is to prevent water and soil from building position into building, so that in cofferdam internal drainage, excavation pit builds building；One
As be mainly used in waterwork, except as formal building a part in addition to, cofferdam is generally removed after being finished, cofferdam height
Higher than the peak level being likely to occur in the construction time；The effect in cofferdam not only can with waterproof, enclose water, but also the hole of foundation pit can be supported
Wall.
Mainly there are steel sheet-pile cofferdam, lock steel pipe pile cofferdam, Double-Wall Steel Boxed Cofferdam etc. in common deep water foundation cofferdam, and steel sheet pile encloses
Weir is a kind of most common sheet-pile cofferdam, with intensity height, is easy to squeeze into hard soil layer；But cofferdam building is in water
Perhaps it is easy to make cofferdam leak in soft mud or seals low problem, and cofferdam needs stronger structural strength to guarantee
The performance resistant to pressure in cofferdam.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of raising cofferdam sealing performance and
The cofferdam construction method of structural strength.
To achieve the above object, the present invention provides the following technical scheme that
A kind of cofferdam construction method, comprising the following steps:
Prepare before S1, construction: the position of cofferdam and flume is made in the inspection of the scene of a crime according to drawing；
S2, site clearing: it draws construction main flat face layout drawing and determines and excavate route, substrate absolute altitude, grade of side slope and soil
Place is stacked by side, removes all barriers and trees weeds in excavation region；
S3, cofferdam unwrapping wire: positioning cofferdam, and releases cofferdam according to floor plan and start to the position of closing position；
S4, it beats timber: timber being pressed into ground end, and spacing is 1 meter；
S5, base weir mention: after timber gets to projected depth, being laid with along the direction perpendicular to timber length and put colour bar cloth, moso bamboo
Piece and the woven bag for filling soil, and tamped among woven bag with clay；
S6, it fills weir body: setting up steel pipe on the timber accomplished fluently and timber forms one, then tensed admittedly with wirerope connection
It is fixed, an entirety is formed to resist the weir body of water pressure；
S7, cofferdam protection processing: on weir, body upstream face is laid with one layer of Cloth capable of reflecting sun infrared and ultraviolet rays, while one layer of volume is equipped on Cloth capable of reflecting sun infrared and ultraviolet rays
Knit packeted soil；
It is cleared up after S8, cofferdam completion: weir Nei Shui being drained and the mud of river bed is cleared up；
Detect after S9, construction: the multiple observation points of top layout in cofferdam see the water level in cofferdam, sedimentation, displacement
It surveys, and forms sedimentation deformation curve；
S10, backfilling of earthwork control；
S11, prevent mixing geomembrane: after the completion of cofferdam is filled, upstream face being taken to cover geomembrane measure, when being laid with geomembrane,
In lower part ballast, keep geomembrane smooth to riverbed bottom along upstream face, geomembrane extends under the bottom of slope of cofferdam 1-2 centimetres, and bottom is planted
Below underground layer or using sand pocket back-pressure；
S12, foundation pit Yield rainfall relation: excavating open drain on the inside of cofferdam after the completion of cofferdam, 1.5-2 centimetres of depth is dug in gutter,
Top width portion is spaced 50 meters and sets catch pit less than 1 centimetre, i.e., the ponding in cofferdam is excluded with slush pump；
The dismounting of S13, cofferdam: cofferdam is removed after the completion of cofferdam.
So set, make corresponding drawing by the inspection of the scene of a crime, convenient for cofferdam carry out whole layout and
Operation, facilitates observation, later again to site clearing, after cleaning out some drosses, the plants such as impetuousness, in the base for determining cofferdam
Place is stacked in bottom absolute altitude, grade of side slope and the earthwork, after the positioning of cofferdam, plans position from start to end；Wood is carried out later
The piling of stake, determines the specific orientation in practically necessary cofferdam, after timber is accomplished fluently, by the way that color cloth and bamboo plate is arranged,
It is connected timber, improves the stability of timber, soil and the intermediate braiding tamped with clay will be filled again later
Bag, improves the dense effect in cofferdam and the waterproof effect in cofferdam, sets up steel pipe on the timber accomplished fluently later and is formed with timber
One is strained and fixed with wirerope connection, forms an entirety to resist the weir body of water pressure, improve the stability in cofferdam,
Improve the structural strength of weir body；It is laid with one layer of Cloth capable of reflecting sun infrared and ultraviolet rays in weir body upstream face after cofferdam is good, while being equipped on Cloth capable of reflecting sun infrared and ultraviolet rays
One layer of knitting bagged soil improves the protective effect to filling after the body of weir to weir body, reduces rainwater and washes away to weir body, cofferdam is completed
It afterwards to plumbing is carried out in weir, avoids the transition in weir moist, while clearing up sludge, makes to increase in weir, reduction is being built
Transition settles when building weir body, after cofferdam is built up, multiple observation points of top layout in cofferdam, to the water level to cofferdam, sedimentation, position
Shifting is observed, and forms sedimentation deformation curve, can understand the concrete condition in cofferdam in real time, convenient to corresponding countermeasure out, most
Afterwards again by backfilling of earthwork control, make weir body ground end more consolidation, after its build pedestal when it is more stable, reduce sedimentation
Amount improves security and stability；Have in entire scheme and improve cofferdam sealing performance and structural strength, while also improving cofferdam and building
Observation performance when building, and then improve the effect of the security and stability of cofferdam construction.
Weir: when building weir body, being mentioned the arc for building up and encircleing to upstream face by further setting, and the height that arches upward is river width
10%, and it is not less than 2 meters, two rows of timbers are beaten in the side slope that weir proposes a side of backwater and are reinforced, and the diameter of timber is not less than 10 lis
It is rice, 4~6 meters a length of, it 1.5 meters of array pitch, 1 meter of pilespacing and is staggered, builds 2 meters with the woven bag for filling clay in the inside of timber
Wide dike, then fill weir body.
So set, camber is arranged in windward side, the impact that water mentions weir can be reduced, have the function that a caching,
Have the function of improving weir body structure, while beating two rows of timbers in the side slope that weir proposes a side of backwater and reinforcing, branch can be played
Support weir body receives the effect of hydraulic pressure or impact, improves the effect of weir body structure；It is used simultaneously in the inside of timber and fills clay
Woven bag builds 2 meters of wide dikes, then fills weir body, has the function of improving weir body structural strength, with timber in the intensity of weir body
Play good supporting role.
Further setting: when beating timber, first helping stake in place timber, beats timber using excavator, and bucket is by timber
It is pressed into ground certain depth to subdue from after surely, then by timber, spacing is 1 meter.
So set, will beat again after timber righting in advance, the accuracy of timber insertion ground end is improved, it is steady to timber
It after fixed, then is beaten, the stability and safe operation performance of timber can be improved.
Further setting: after timber gets to projected depth, colour bar cloth and moso bamboo are laid with along the direction perpendicular to timber length
Piece is then placed in the woven bag for filling soil, and two rows are successively neatly packed in a manner of laminating；It squeezes into the same way another
Side rail stake and the two rows of woven bags of stacking or straw bag, centre are tamped with clay, and successively follow-up is until cofferdam completion, cofferdam height are high
1 meter of the water surface out.
So set, by being laid with colour bar cloth and bamboo plate along the direction of timber, can be improved timber squeeze into it is whole after ground end
Body connection function improves the structural strength of building weir body, while by colour bar cloth and bamboo plate, also improves the closely knit effect that weir proposes
Fruit, and then improve the waterproof effect in cofferdam；Cofferdam height is higher by 1 meter of the water surface, water body is effectively reduced and flows into the intracorporal effect in weir,
Improve the waterproof sealing effect of weir body.
Further setting: it after the completion of cofferdam, is discharged with the water in pump handle cofferdam, and oblique in side steel pipe downstream
Support, to keep out the pressure of unilateral water.
So set, by after the water discharge in cofferdam, convenient for constructing in cofferdam, while the side steel in downstream
Pipe diagonal brace increases effect of the cofferdam to the pressure for keeping out unilateral water, improves the structural strength in cofferdam.
Further setting: in cofferdam protection processing, the Cloth capable of reflecting sun infrared and ultraviolet rays of upstream face is protected using non-woven geotextile, and in nothing
It spins between geotextiles are stitched and is coupled with nylon rope, protected under the slope foot of outside using the native woven bag compacting of dress.
So set, can reduce water by the way that Cloth capable of reflecting sun infrared and ultraviolet rays is arranged in upstream face and be washed away to cofferdam, improve the protection to cofferdam
Effect, while the effect that non-woven geotextile has structural strength good and cheap, can with nylon rope connection between geotextiles are stitched
Bonding strength when improving whole covering between non-woven geotextile is mentioned under slope foot using native woven bag compacting protection is filled on the outside
High non-woven geotextile is pressed in the effect on cofferdam, improves the protective effect to cofferdam.
Further setting: the Cloth capable of reflecting sun infrared and ultraviolet rays of upstream face is layed in the side in riverbed, and Cloth capable of reflecting sun infrared and ultraviolet rays is laid with and is not less than 2 meters, up and down
The layer Cloth capable of reflecting sun infrared and ultraviolet rays lap of splice is 1 meter, remaining joint length overlap joint is 0.5 meter.
So set, improving the effect in Cloth capable of reflecting sun infrared and ultraviolet rays protection cofferdam.
Further setting: backfilling of earthwork control the following steps are included:
1) earthwork selects: slag or sticky earthen backfill using the biochemistry pool earthwork, and rams compaction in layers with the frog；
2) be layered joint treatment: every layer of seam crossing is stepped arrangement, and grinding mark is 0.5 meter, upper and lower level seam should be staggered and
Not less than 1 meter；
3) anticipated settlement: no more than the 3% of embankment total height；
4) pond side slope requirement: stepped setting, and the ratio of width to height is 1:1.5, a height of 300 millimeters of step, width is 450 millis
Rice；
5) compacting filling soil quality testing: inspection is sampled using layering, multiple check points are set and examines its density and contains
Water.
So set, by that, using the slag of the biochemistry pool earthwork or sticky earthen backfill, can reduce in the earthwork at middle part cubic metre of earth
Biological bacterium etc. breed, reduce corrosion of the biology to weir body, increase the structural stability held in the body of weir and reduction builds up weir
Transition settles after body；Every layer of seam crossing is stepped arrangement, and upper and lower level seam should be staggered, and the connection between adjacent layering can be improved
Stability, while anticipated settlement is no more than the 3% of embankment total height, effectively adapts to the adjusting after the micro sedimentation of later period weir body
Effect, the stepped setting of pond side slope, making weir body on the whole is in triangular shape setting, the structural stability of weir body can be improved, most
Detection is sampled after compacting filling soil afterwards, density is carried out to weir body and water content detects, improves the implementation exploration to weir body
Effect.
Further setting: in compaction in layers, grinding compacting, and side of a pond block stone grain diameter is not more than 20 centimetres, organic matter contains
Amount is not more than 8%, and clay content is not less than 50%.
So set, making by compaction in layers in the middle part of cofferdam, grinding compacting has the function that monolithic stability, while the side of a pond
Block stone grain diameter is not more than 20 centimetres, can reduce when rolling, the gap between adjacent stone grain increases the closely knit of backfilling of earthwork
Degree；Content of organics is not more than 8% simultaneously, reduces the growth of some biological bacteriums and corrodes cofferdam, improves the building safety of weir body
Property；And clay content is not less than 50%, and the mutual bonding of backfill substance in the body of weir can be improved, and then improves the structural stability of weir body.
Further setting: in layering joint treatment, the compacting of embankment edge backfills 0.2 meter along embankment width direction, side
Slope leveling makes real, and is pounded with frog hammer closely knit.
So set, each layer of compactedness can be improved, reduces later period transition sedimentation, while edge being compacted, reduce soil
The abrasion of method, edge, convenient for improving whole stability.
By using above-mentioned technical proposal, the present invention compares compared with the prior art: making have safety in the architectural process of cofferdam
After cofferdam is built up, by color cloth, bamboo plate and woven bag, the sealing performance and knot in cofferdam is can be improved in stable effect
Structure intensity carries out preparation of construction convenient for later period weir body and backfilling of earthwork；The multiple observation points of top layout in cofferdam simultaneously are right
The water level in cofferdam, sedimentation, displacement are observed, and form sedimentation deformation curve, can understand the concrete condition in cofferdam in real time, convenient
To corresponding countermeasure out；The observation performance when building of cofferdam is also improved simultaneously, and then improve the security and stability of cofferdam construction
Effect.
Specific embodiment
A kind of cofferdam construction method is described further below.
A kind of cofferdam construction method, comprising the following steps:
Prepare before S1, construction: first carrying out the inspection of the scene of a crime, space enrironment, geology and sub-marine situations is understood, further according to drawing
Make the position of cofferdam and flume.
S2, site clearing: it draws construction main flat face layout drawing and determines and excavate route, substrate absolute altitude, grade of side slope and soil
Place is stacked by side, removes all barriers and trees weeds in excavation region.
S3, cofferdam unwrapping wire: positioning cofferdam, and releases cofferdam according to floor plan and start to the position of closing position,
It is banketed absolute altitude during filling with level measurement.
S4, beat timber: timber selects fine quality timber when purchasing, timber is 6 meters long, and microcephaly 14cm ~ 16cm, timber is not
Must there are channel, crackle or other flaws for being enough to damage intensity；First help stake in place timber, 2 people help stake, and 1 people is responsible for controlling stake
Verticality, spacing, stake top absolute altitude etc., recycle excavator to beat timber, timber is pressed into ground certain depth from steady by bucket
Afterwards, then allowing helps a people to leave, then timber is subdued；Two rows of timbers are beaten in a side side slope that weir mentions backwater to reinforce, and
It is 4 that every row, which squeezes into timber, the diameter of timber not less than 10 centimetres, it is 4~6 meters a length of, 1.5 meters of array pitch, 1 meter of pilespacing and staggered row
Column, squeeze into other side timber in the same way.
S5, base weir mention: in order to keep dense effect good, the waterproof effect in cofferdam are improved, after timber gets to projected depth, along vertical
It is directly laid with colour bar cloth and bamboo plate in the direction of timber length, is then placed in the woven bag for filling soil, with the side laminated
Formula two rows are successively neatly packed, and are tamped among woven bag with clay, and successively until cofferdam is completed, cofferdam height height is discharged for follow-up
1 meter of face.
When building weir body, weir is mentioned to the arc for building up and encircleing to upstream face, the height that arches upward is the 10% of river width, and is not less than 2
Rice, builds 2 meters of wide dikes with the woven bag for filling clay in the inside of timber, then fill weir body.
S6, it fills weir body: setting up steel pipe on the timber accomplished fluently and timber forms one, then tensed admittedly with wirerope connection
It is fixed, an entirety is formed to resist the weir body of water pressure.
S7, cofferdam protection processing: ensuring cofferdam safely is the reliable guarantee gone on smoothly of constructing, in order to prevent rain drop erosion
With the influence of stormy waves, after the completion of cofferdam is filled, on weir body upstream face be laid with one layer of Cloth capable of reflecting sun infrared and ultraviolet rays, Cloth capable of reflecting sun infrared and ultraviolet rays using non-woven geotextile into
Row protection, and coupled between geotextiles seam with nylon rope, Cloth capable of reflecting sun infrared and ultraviolet rays is layed in the side in riverbed, and is not less than 2 meters, and upper and lower level is too
The positive cloth lap of splice is 1 meter, remaining joint length overlap joint is 0.5 meter；Using native woven bag compacting protection is filled under the slope foot of outside, together
When one layer of knitting bagged soil is equipped on Cloth capable of reflecting sun infrared and ultraviolet rays.
It clears up: being discharged with the water in pump handle cofferdam, and in the steel pipe diagonal brace of side downstream after S8, cofferdam completion,
To keep out the pressure of unilateral water；Weir Nei Shui is drained again and the mud of river bed is cleared up.
Detect after S9, construction: the multiple observation points of top layout in cofferdam see the water level in cofferdam, sedimentation, displacement
It surveys, and forms sedimentation deformation curve.
S10, backfilling of earthwork control, comprising the following steps:
1) earthwork selects: slag or sticky earthen backfill using the biochemistry pool earthwork, and rams compaction in layers, compacting factor with the frog
Be 0.9, rubble can block stone maximum particle diameter be not more than 20 centimetres, big partial size concentration fill or must not fill at sectionalizing joint or embankment
Joint, content of organics are not more than 8%, and pool slag clay content is no less than 50%；By earthwork construction machinery come reversion at the top of cofferdam
It sails, be compacted, compactness is not less than 80%, and levee crown reserves 50 centimetres of settling amounts.
2) be layered joint treatment: every layer of seam crossing is stepped arrangement, and grinding mark is 0.5 meter, upper and lower level seam should be staggered and
Not less than 1 meter；The compacting of embankment edge backfills 0.2 meter along embankment width direction, and bluff makes real, and with breast-stroke ramming
Machine pounds closely knit.
3) anticipated settlement: no more than the 3% of embankment total height.
4) pond side slope requirement: stepped setting, and the ratio of width to height is 1:1.5, a height of 300 millimeters of step, width is 450 millis
Rice.
5) compacting filling soil quality testing: inspection is sampled using layering, multiple check points are set and examines its density and contains
Water.
S11, prevent mixing geomembrane: after the completion of cofferdam is filled, upstream face being taken to cover geomembrane measure, when being laid with geomembrane,
In lower part ballast, keep geomembrane smooth to riverbed bottom along upstream face, geomembrane extends under the bottom of slope of cofferdam 1-2 centimetres, and bottom is planted
Below underground layer or sand pocket back-pressure is used, guarantees cofferdam safety.
S12, foundation pit Yield rainfall relation: excavating open drain on the inside of cofferdam after cofferdam is good, 1.5-2 centimetres deep, top is dug in gutter
Wide portion is spaced 50 meters and sets catch pit less than 1 centimetre, i.e., the ponding in cofferdam is excluded with slush pump.
The dismounting of S13, cofferdam: as the case may be, it may be selected to remove or do not remove cofferdam, this programme is preferred, cofferdam
Cofferdam is removed after completion.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned reality
Example is applied, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that being led for this technology
For the those of ordinary skill in domain, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of cofferdam construction method, which comprises the following steps:
Prepare before S1, construction: the position of cofferdam and flume is made in the inspection of the scene of a crime according to drawing；
S2, site clearing: it draws construction main flat face layout drawing and determines and excavate route, substrate absolute altitude, grade of side slope and earthwork heap
Place is put, all barriers and trees weeds in excavation region are removed；
S3, cofferdam unwrapping wire: positioning cofferdam, and releases cofferdam according to floor plan and start to the position of closing position；
S4, it beats timber: timber being pressed into ground end, and spacing is 1 meter；
S5, build weir mention: after timber gets to projected depth, along perpendicular to timber length direction be laid with colour bar cloth, bamboo plate and
The woven bag of soil is filled, and is tamped among woven bag with clay；
S6, it fills weir body: setting up steel pipe on the timber accomplished fluently and timber forms one, then be strained and fixed with wirerope connection,
An entirety is formed to resist the weir body of water pressure；
S7, cofferdam protection processing: on weir, body upstream face is laid with one layer of Cloth capable of reflecting sun infrared and ultraviolet rays, while one layer of woven bag is equipped on Cloth capable of reflecting sun infrared and ultraviolet rays
Dress soil；
It is cleared up after S8, cofferdam completion: weir Nei Shui being drained and the mud of river bed is cleared up；
Detect after S9, construction: the multiple observation points of top layout in cofferdam are observed the water level in cofferdam, sedimentation, displacement, and
Form sedimentation deformation curve；
S10, backfilling of earthwork control；
S11, prevent mixing geomembrane: after the completion of cofferdam is filled, upstream face being taken to cover geomembrane measure, when being laid with geomembrane, under
Portion's ballast keeps geomembrane smooth to riverbed bottom along upstream face, and geomembrane extends under the bottom of slope of cofferdam 1-2 centimetres, bottom implantation soil
Layer or less or use sand pocket back-pressure；
S12, foundation pit Yield rainfall relation: excavating open drain on the inside of cofferdam after the completion of cofferdam, 1.5-2 centimetres deep, top width is dug in gutter
Portion is spaced 50 meters and sets catch pit less than 1 centimetre, i.e., the ponding in cofferdam is excluded with slush pump；
The dismounting of S13, cofferdam: cofferdam is removed after the completion of cofferdam.
2. a kind of cofferdam construction method according to claim 1, it is characterised in that: when building weir body, weir is mentioned and is built up
The arc encircleed to upstream face, the height that arches upward is the 10% of river width, and is not less than 2 meters, makes a call to two in a side side slope that weir mentions backwater
Timber is arranged to reinforce, the diameter of timber not less than 10 centimetres, it is 4~6 meters a length of, 1.5 meters of array pitch, 1 meter of pilespacing and be staggered, in wood
2 meters of wide dikes are built with the woven bag for filling clay in the inside of stake, then fill weir body.
3. a kind of cofferdam construction method according to claim 1, it is characterised in that: when beating timber, timber is first helped stake
In place, timber is beaten using excavator, bucket subdues timber indentation ground certain depth from after surely, then by timber, spacing
It is 1 meter.
4. a kind of cofferdam construction method according to claim 1 or 3, it is characterised in that: after timber gets to projected depth, edge
It is laid with colour bar cloth and bamboo plate perpendicular to the direction of timber length, the woven bag for filling soil is then placed in, in a manner of laminating
It is two rows of successively neatly packed；Other side timber is squeezed into the same way and stacks two rows of woven bags or straw bag, and centre is used viscous
Soil tamps, and successively until cofferdam is completed, cofferdam height is higher by 1 meter of the water surface for follow-up.
5. a kind of cofferdam construction method according to claim 1, it is characterised in that: after the completion of cofferdam, with pump handle cofferdam
Interior water discharge, and in the steel pipe diagonal brace of side downstream, to keep out the pressure of unilateral water.
6. a kind of cofferdam construction method according to claim 1, it is characterised in that: in cofferdam protection processing, upstream face
Cloth capable of reflecting sun infrared and ultraviolet rays is protected using non-woven geotextile, and is coupled between non-woven geotextile seam with nylon rope, using dress under the slope foot of outside
Native woven bag compacting protection.
7. a kind of cofferdam construction method according to claim 1 or 6, it is characterised in that: the Cloth capable of reflecting sun infrared and ultraviolet rays of upstream face is layed in
The side in riverbed, and Cloth capable of reflecting sun infrared and ultraviolet rays is laid with and is not less than 2 meters, the upper and lower level Cloth capable of reflecting sun infrared and ultraviolet rays lap of splice is 1 meter, remaining joint length overlap joint is
0.5 meter.
8. a kind of cofferdam construction method according to claim 1, it is characterised in that: backfilling of earthwork control includes following step
It is rapid:
1) earthwork selects: slag or sticky earthen backfill using the biochemistry pool earthwork, and rams compaction in layers with the frog；
2) be layered joint treatment: every layer of seam crossing is stepped arrangement, and grinding mark is 0.5 meter, and upper and lower level seam should be staggered and not small
In 1 meter；
3) anticipated settlement: no more than the 3% of embankment total height；
4) pond side slope requirement: stepped setting, and the ratio of width to height is 1:1.5, a height of 300 millimeters of step, width is 450 millimeters；
5) compacting filling soil quality testing: inspection is sampled using layering, multiple check points are set and examine its bulk density and water content.
9. a kind of cofferdam construction method according to claim 8, it is characterised in that: in compaction in layers, grinding compacting, and the pool
Side block stone grain diameter is not more than 20 centimetres, and content of organics is not more than 8%, and clay content is not less than 50%.
10. a kind of cofferdam construction method according to claim 8, it is characterised in that: in layering joint treatment, embankment edge
Position compacting backfills 0.2 meter along embankment width direction, and bluff makes real, and is pounded with frog hammer closely knit.
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