CN104153380B - A kind of antiseepage cofferdam structure and construction technology - Google Patents

A kind of antiseepage cofferdam structure and construction technology Download PDF

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CN104153380B
CN104153380B CN201410408540.3A CN201410408540A CN104153380B CN 104153380 B CN104153380 B CN 104153380B CN 201410408540 A CN201410408540 A CN 201410408540A CN 104153380 B CN104153380 B CN 104153380B
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cofferdam
antiseepage
gravel
impervious
construction
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CN104153380A (en
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盛东峰
朱有田
雷春华
张宝红
杜海民
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Sinohydro Bureau 11 Co Ltd
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Sinohydro Bureau 11 Co Ltd
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Abstract

The present invention relates to a kind of antiseepage cofferdam structure and construction technology, described cofferdam structure includes being arranged on vertical impervious body in the middle part of the end face of cofferdam, the bottom of impervious body extends embedment Riverbed, the main body of impervious body is filled by multilamellar cement sand and gravel compound and is formed, vertical antiseepage insulating course it is provided with in the side of impervious body, antiseepage insulating course is to accompany one layer of geomembrane between two-layer geotextile, and the opposite side of antiseepage insulating course is trapezoidal cofferdam body, and the opposite side at impervious body is provided with galvanized wire SHILONG;Construction technology includes: be purged by the ratchel in base area with backacter after building Temporary Cofferdam;Excavate the groove of deep 3 meters of wide 1.2m again along cofferdam axis with backacter, then back-filling in layers cement sand and gravel compound builds antiseepage cofferdam structure.This antiseepage cofferdam version is simple, and construction method is easy, and anti-seepage effect is preferable.The more reduction of erection time, saving fund provides simple effective method from the hierarchy of skill.

Description

A kind of antiseepage cofferdam structure and construction technology
Technical field
The present invention relates on deeply covered layer riverbed, utilize cement sand and gravel compound, geotextile, geomembrane to enter The structure of row seepage prevention of cofferdam and the construction technology of antiseepage.
Background technology
In the prior art, stone cofferdam is the cofferdam filled with local material, gathers materials on the spot and the most sharp Cofferdam filler, simple structure, easy construction is made, it is easy to removing, construction costs is low, this by excavation rejected material Cofferdam form is widely adopted.But the filling material of main body earth rock cofferdam is substantially all, and to there is infiltration coefficient big Problem.Therefore, the research of antiseepage problem the most just becomes earth rock cofferdam development key problem.Make a general survey of soil stone to enclose Weir is developed, and history Italy at the beginning of the fifties in last century and France start with slurry strengthened wall boring method at gravel foundation Upper construction hydraulic anti-seepage wall.Italy has built docking in nineteen fifty-one~nineteen fifty-two under Ba Shesi diversion cofferdam Type cut-pff wall, draws brother dam in 1954~nineteen fifty-five in AVE MAROA one Austria one, by the deep gravel containing big boulder Layer, uses and has built linked concrete cut according to Coase one one-dimensional Dai Erfa impact brill pore-creating slurry strengthened wall.
Seepage control for rock-earth cofferdam has the development advanced by leaps and bounds, especially grouting technique and high-injection technique in recent years Application not only makes the seepage control project of earth rock cofferdam save the duration, is more reduction of cost.But seepage prevention of cofferdam belongs to In a concealed work, the quality of antiseepage quality can only be commented at the height that seepage control project terminates by water percolating capacity Valency, and once quality goes wrong extremely difficult process, and the delay of duration, loss economically is all follow-up work The construction of journey causes unthinkable consequence.Therefore it is accomplished by using a set of scientific and reasonable seepage control for rock-earth cofferdam Structure, anti-seepage processing method and the quality control theory during filling.
Owing to most earth rock cofferdams need to construct under water, material can not Effective Compaction, the most under water Throwing Impervious Materials is more it cannot be guaranteed that the quality of the antiseepage in cofferdam.And earth rock cofferdam is in order to meet antiseepage requirement, Seepage prevention of cofferdam section can not be made again too small, and the generally cofferdam construction duration is the most urgent, and cost is the most unsuitable The highest.In current domestic and international earth rock cofferdam construction frequently with anti-seepage processing method all there is this and above-mentioned Variety of problems.Therefore, under the section that disclosure satisfy that easy construction requires, reduce section chi as much as possible Very little can meet again antiseepage requirement well, become earth rock cofferdam and fill the developing direction with anti-seepage processing method.
Summary of the invention
It is an object of the invention to, the problem existed for prior art, it is provided that a kind of simple in construction construction costs Relatively low, the duration can be greatly shortened, antiseepage cofferdam structure that antiseepage quality can significantly improve and construction technology.
For achieving the above object, the technical solution used in the present invention is: provide a kind of antiseepage cofferdam structure, It is characterized in that, the structure in cofferdam includes being arranged on vertical impervious body, the bottom of impervious body in the middle part of the end face of cofferdam Extending embedment Riverbed, the main body of impervious body is filled by multilamellar cement sand and gravel compound and is formed, anti- The side oozing body is provided with vertical antiseepage insulating course, and antiseepage insulating course is to accompany one layer between two-layer geotextile Geomembrane, the opposite side of antiseepage insulating course is trapezoidal cofferdam body, and the opposite side at impervious body is provided with galvanized wire gabion.
Wherein preferably technical scheme is that the cross section of described vertical impervious body is rectangle, rectangular width Being 3 meters, it is 1.2 meters that vertical impervious body extends the embedment Riverbed degree of depth.
Preferably technical scheme also has, and it is 1:0.3 that described cofferdam is provided with the gradient of galvanized wire gabion side, described in enclose The gradient of weir opposite side is 1:1, and the cross section in described cofferdam is trapezoidal, a length of 6 meters of this trapezoidal upper end, goes to the bottom A length of 17.7 meters, a height of 6 meters;The thickness of described galvanized wire gabion is 1 meter.
Preferably technical scheme also has, and described geotextile is by saturating by acupuncture or braiding of synthetic fibers Aqueous geosynthetics, its finished product is cloth-like, and width is 4-6 rice, described synthetic fibers be terylene, polypropylene, Acrylon, chinlon family macromolecule polymer;Described geomembrane is that plastic sheeting is multiple with non-woven fabrics as antiseepage base material Conjunction forms.
Preferably technical scheme also has, and the thickness of described multilamellar cement sand and gravel compound every layer is less than 50 centimetres.
For achieving the above object, another technical solution used in the present invention is: provide a kind of antiseepage cofferdam Construction technology, it is characterised in that described construction technology comprises the technical steps that:
Step 1: first build Temporary Cofferdam;
Step 2: be purged by the ratchel in base area with backacter, utilize vibrations to grind will simultaneously Basis compaction;
Step 3: before construction is built in cofferdam, must the galvanized wire gabion of deposit abundance, boulder, cement, geotechnique Cloth and geomembrane, and select the good sand gravel mining area of grating and cement sand and gravel compound in advance and mix place;
Step 4: with backacter along the groove of cofferdam axis deep 3 meters of wide 1.2m of excavation, be then layered back Filling out cement sand and gravel compound and build antiseepage cofferdam structure, described antiseepage cofferdam structure, at back-filling in layers glue Vertical geotextile and geomembrane, every layer of cement sand and gravel compound is laid while solidifying sand gravel compound Backfill height is less than 50cm, and layered rolling;
Step 5: when cement sand and gravel compound is backfilling into riverbed original height, one layer of galvanized wire stone of should first constructing Cage, then carry out the placement in layers of cofferdam and impervious body, both cofferdam body filled with galvanized wire gabion alternately, with Time opposite side Cast-in-situ Piles in Sand-filling gravel in cofferdam, until landfill is to the setting height in cofferdam.
Wherein preferably technical scheme is that described galvanized wire gabion construction procedure is, before cofferdam is filled, in advance Making protection against erosion galvanized wire gabion, select block stone or cobble, particle diameter is not less than 15cm, is dug by backhoe during making Pick machine is put, it is desirable to block stone faces down greatly, gabion is completely filled out, nothing relatively macroscopic-void, uses 8 between cage and cage Number galvanized wire colligation is firm.
Further preferred technical scheme is, the mix layered step of filling of described cement sand and gravel requires in drought Ground construction, set up interim little cofferdam during construction, with galvanized wire gabion put and placement in layers, lift height is pressed 50cm is controlled, and surging is not less than 95%;Cement sand and gravel compound is at the construction field (site) by backhoe excavating It is uniform that machine shifts to an earlier date mix, dump truck be transported to cofferdam, bull-dozer or land leveller carry out paving smooth, then Grinding compacting is carried out by vibrations stone roller.
Further preferred technical scheme is, the mix layered step of filling of described cement sand and gravel is additionally included in Before construction premise at the construction field (site) near smooth one 30m × 30m place, and grinding compacting, be used for the gravel that is gelled Stone compound job mix;Cement sand and gravel compound is that sandstone aggregate is selected directly from the gravel of river mining Stone, and reject the particle diameter oversize stone more than 150mm with screen cloth, Binder Materials selects No. 53 JP cement, mixes Amount is by 60~80kg, during mix, by backacter mix 6~8 times;It is transported to cofferdam work by dump truck Face, is paved by bull-dozer or land leveller, slicce thickness void paving 45cm, compacted depth about 40cm, adopts Carry out grinding compacting with vibrations stone roller, roll initial option 2+6 time, i.e. static pressure 2 times, vibrations roll 6 times.
Further preferred technical scheme is, the laying step of described geotextile and geomembrane is that geotechnique knits The model of thing selects 225g/m2, elongation at break is more than 60%, and geomembrane selects HDPE geomembrane, stretching Intensity is more than 17Mpa, and elongation at break is more than 400%;The lap of splice is not less than 50cm, closes on geomembrane The backfill material at place is uniform, good cobble, should choose crushing-type simultaneously and be pointed at or the river ovum of corner angle Stone.
Compared with prior art, the invention has the beneficial effects as follows: use antiseepage cofferdam structure of the present invention and Construction technology, owing to construction method is convenient, version is simple, does not has too much red tape.Therefore It is possible not only to reach to save duration, the purpose of saving fund, the most also meets the demand of antiseepage. The filling material of the most general earth rock cofferdam, for gathering materials on the spot, typically uses coagulation on seepage control measure The method of soil cut-pff wall, clay core wall, seepage preventing curtain grouting, brill spray stake etc..Concrete cut, anti- Ooze grout curtain, bore spray stake due to working procedure complex, govern the progress of duration, and also exist The problem that cost is higher.Clay core wall earth rock cofferdam due to the impervious material such as clay source region also Be not suitable for filling of all earth rock cofferdams.And use the cement sand and gravel mixing material of the present invention to combine geotechnique and knit Thing and geomembrane are as the way of impervious body, and not only version is simple, and construction method is easy, anti-seepage effect Preferably.The more reduction of erection time, saving fund provides simple effective method from technological layer.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of antiseepage cofferdam structure of the present invention.
Shown in figure: 1-impervious body, 2-galvanized wire gabion, 3-trapezoidal cofferdam body, 4-Riverbed, 5-is gelled Sand gravel compound, 6-geotextile, 7-geomembrane, 8-geotextile.
Detailed description of the invention
As it is shown in figure 1, the present invention is a kind of antiseepage cofferdam structure, described cofferdam structure includes being arranged on cofferdam Vertical impervious body 1 in the middle part of end face, the bottom of impervious body 1 extends embedment Riverbed 4, the master of impervious body 1 Body by multilamellar cement sand and gravel compound 5 fill form, be provided with in the side of impervious body 1 vertical antiseepage every Tomography, antiseepage insulating course is to accompany one layer of geomembrane 7, antiseepage insulating course between two-layer geotextile 6,8 Opposite side be trapezoidal cofferdam body 3, the opposite side at impervious body 1 is provided with galvanized wire gabion 2.
Preferred embodiment is in the present invention, and the cross section of described vertical impervious body 1 is rectangle, rectangular The width of shape is 3 meters, and it is 1.2 meters that vertical impervious body 1 extends embedment Riverbed 4 degree of depth.
Preferred embodiment also has in the present invention, and described cofferdam is provided with the gradient of galvanized wire gabion 2 side and is 1:0.3, the gradient of described cofferdam opposite side is 1:1, and the cross section in described cofferdam is trapezoidal, this trapezoidal length of the upper end It is 6 meters, goes to the bottom a length of 17.7 meters, a height of 6 meters;The thickness of described galvanized wire gabion 2 is 1 meter.
Preferred embodiment also has in the present invention, and described geotextile 6,8 is passed through acupuncture by synthetic fibers Or the water penetration geosynthetics of braiding, its finished product is cloth-like, and width is 4-6 rice, and described synthesis is fine Dimension is terylene, polypropylene, acrylon, chinlon family macromolecule polymer;Described geomembrane plastic sheeting is as antiseepage Base material, forms with non-woven fabric compounded.
Preferably technical scheme also has in the present invention, the cement sand and gravel compound of described multilamellar 5 every layer Thickness is less than 50 centimetres.
Another technical solution used in the present invention is: provide a kind of antiseepage cofferdam construction technology, this construction technology Comprise the technical steps that:
Step 1: first build Temporary Cofferdam;
Step 2: be purged by the ratchel in base area with backacter, utilize vibrations to grind will simultaneously Basis compaction;
Step 3: before construction is built in cofferdam, must the galvanized wire gabion of deposit abundance, boulder, cement, geotechnique Cloth and geomembrane, and select the good sand gravel mining area of grating and cement sand and gravel compound in advance and mix place;
Step 4: with backacter along the groove of cofferdam axis deep 3 meters of wide 1.2m of excavation, be then layered back Fill out cement sand and gravel compound and build power antiseepage cofferdam structure described in 1, mix in back-filling in layers cement sand and gravel Laying vertical geotextile and geomembrane while closing material, every layer of cement sand and gravel compound backfills the most not More than 50cm, and layered rolling;
Step 5: when cement sand and gravel compound is backfilling into riverbed original height, one layer of galvanized wire stone of should first constructing Cage, then carry out the placement in layers of cofferdam and impervious body, both cofferdam body filled with galvanized wire gabion alternately, with Time opposite side Cast-in-situ Piles in Sand-filling gravel in cofferdam, until landfill is to the setting height in cofferdam.
Preferred embodiment is in the present invention, and described galvanized wire gabion 2 construction procedure is to fill in cofferdam Before, making protection against erosion galvanized wire gabion in advance, select block stone or cobble, particle diameter is not less than 15cm, during making Put by backacter, it is desirable to block stone faces down greatly, gabion is completely filled out, without relatively macroscopic-void, cage and cage Between use No. 8 galvanized wire colligations firm.
Further preferred embodiment is in the present invention, the placement in layers of described cement sand and gravel compound 5 Technological requirement, at construction at dry land, sets up interim little cofferdam during construction, with galvanized wire gabion put and placement in layers, Lift height is controlled by 50cm, and surging is not less than 95%;Cement sand and gravel compound 5 is existing in construction Field is shifted to an earlier date uniform mixing by backacter, dump truck after being transported to cofferdam, bull-dozer or land leveller enter Row paves smooth, then is carried out grinding compacting by vibrations stone roller.
Further preferred embodiment is in the present invention, and described cement sand and gravel is mix layered fills step Suddenly it is additionally included in before construction premise smooth one 30m × 30m place near at the construction field (site), and grinding compacting, uses Mix and stir in cement sand and gravel compound scene;Cement sand and gravel compound 5 is selected directly from river for sandstone aggregate The sand gravel of bed exploitation, and reject the particle diameter oversize stone more than 150mm with screen cloth, Binder Materials selects 53 Number JP cement, volume is pressed 60~80kg, when mixing and stirring, backacter is mixed and stirred 6~8 times;By self-unloading vapour Car is transported to cofferdam work surface, bull-dozer or land leveller pave, slicce thickness void paving 45cm, compacting thickness Spend about 40cm, use vibrations stone roller to carry out grinding compacting, roll initial option 2+6 time, be i.e. static pressure 2 times, shake Move and roll 6 times.
Further preferred embodiment is in the present invention, the laying step of described geotextile and geomembrane For, the model of geotextile selects 225g/m2, elongation at break is more than 60%, and geomembrane selects HDPE soil Work film, hot strength is more than 17Mpa, and elongation at break is more than 400%;During construction, the lap of splice is not less than 50cm, and ensure time uniform filling, the good cobble closed at geomembrane, should choose the most broken simultaneously Form wedge angle or the cobble of corner angle.
The invention is not restricted to above-mentioned embodiment, what those skilled in the art were made appoints above-mentioned embodiment What the most conspicuously improved or change, all without beyond the design of the present invention and the protection model of claims Enclose.

Claims (10)

1. an antiseepage cofferdam structure, it is characterised in that the structure in cofferdam includes being arranged in the middle part of the end face of cofferdam Vertical impervious body, the bottom of impervious body extends embedment Riverbed, and the main body of impervious body is by the gelling of multilamellar Sand gravel compound is filled and is formed, and is provided with vertical antiseepage insulating course in the side of impervious body, and antiseepage insulating course is Accompanying one layer of geomembrane between two-layer geotextile, the opposite side of antiseepage insulating course is trapezoidal cofferdam body, The opposite side of impervious body is provided with galvanized wire gabion.
2. antiseepage cofferdam structure as claimed in claim 1, it is characterised in that cutting of described vertical impervious body Face is rectangle, and rectangular width is 3 meters, and it is 1.2 that vertical impervious body extends the embedment Riverbed degree of depth Rice.
3. antiseepage cofferdam structure as claimed in claim 1, it is characterised in that described cofferdam is provided with galvanized wire stone The gradient of cage side is 1:0.3, and the gradient of described cofferdam opposite side is 1:1, and the cross section in described cofferdam is trapezoidal, A length of 6 meters of this trapezoidal upper end, go to the bottom a length of 17.7 meters, a height of 6 meters;The thickness of described galvanized wire gabion is 1 meter.
4. antiseepage cofferdam structure as claimed in claim 1, it is characterised in that described geotextile is by synthesizing The fiber water penetration geosynthetics by acupuncture or braiding, its finished product is cloth-like, and width is 4-6 Rice, described synthetic fibers are terylene, polypropylene, acrylon, chinlon family macromolecule polymer;Described geomembrane is Plastic sheeting forms with non-woven fabric compounded as antiseepage base material.
5. antiseepage cofferdam structure as claimed in claim 1, it is characterised in that the gelling gravel of described multilamellar The thickness of stone compound every layer is less than 50 centimetres.
6. an antiseepage cofferdam construction technology, it is characterised in that described construction technology comprises the technical steps that:
Step 1: first build Temporary Cofferdam;
Step 2: be purged by the ratchel in base area with backacter, utilize vibrations to grind will simultaneously Basis compaction;
Step 3: before construction is built in cofferdam, must the galvanized wire gabion of deposit abundance, boulder, cement, geotechnique Cloth and geomembrane, and select the good sand gravel mining area of grating and cement sand and gravel compound in advance and mix place;
Step 4: with backacter along the groove of cofferdam axis deep 3 meters of wide 1.2m of excavation, be then layered back Fill out cement sand and gravel compound and build power antiseepage cofferdam structure described in 1, mix in back-filling in layers cement sand and gravel Laying vertical geotextile and geomembrane while closing material, every layer of cement sand and gravel compound backfills the most not More than 50cm, and layered rolling;
Step 5: when cement sand and gravel compound is backfilling into riverbed original height, one layer of galvanized wire stone of should first constructing Cage, then carry out the placement in layers of cofferdam and impervious body, i.e. cofferdam body fills with galvanized wire gabion alternately, with Time opposite side Cast-in-situ Piles in Sand-filling gravel in cofferdam, until landfill is to the setting height in cofferdam.
7. antiseepage cofferdam construction technology as claimed in claim 6, it is characterised in that described galvanized wire gabion is executed Work step is suddenly, before cofferdam is filled, makes protection against erosion galvanized wire gabion in advance, selects block stone or cobble, grain Footpath is not less than 15cm, is put by backacter during making, it is desirable to block stone faces down greatly, gabion is completely filled out, Without relatively macroscopic-void, between cage and cage, use No. 8 galvanized wire colligations firm.
8. antiseepage cofferdam construction technology as claimed in claim 6, it is characterised in that described cement sand and gravel Mix layered step of filling requires at construction at dry land, sets up interim little cofferdam, with galvanized wire gabion during construction Putting and placement in layers, lift height is controlled by 50cm, and surging is not less than 95%;Cement sand and gravel Compound is shifted to an earlier date mix uniformly by backacter at the construction field (site), dump truck be transported to cofferdam, by bulldozing Machine or land leveller carry out paving smooth, then are carried out grinding compacting by vibrations stone roller.
9. antiseepage cofferdam construction technology as claimed in claim 8, it is characterised in that described cement sand and gravel Mix layered fill step be additionally included in construction premise before at the construction field (site) near smooth one 30m × 30m field Ground, and grinding compacting, for cement sand and gravel compound job mix;Cement sand and gravel compound is sandstone Aggregate is selected directly from the sand gravel of river mining, and rejects the particle diameter oversize stone more than 150mm with screen cloth, Binder Materials selects No. 53 JP cement, and volume presses 60~80kg, during mix, by backacter mix 6 ~8 times;Being transported to cofferdam work surface by dump truck, bull-dozer or land leveller pave, slicce thickness is empty Paving 45cm, compacted depth about 40cm, use vibrations stone roller to carry out grinding compacting, roll initial option 2+6 time, I.e. static pressure 2 times, vibrations roll 6 times.
10. antiseepage cofferdam construction technology as claimed in claim 6, it is characterised in that described geotextile It is that the model of geotextile selects 225g/m with the laying step of geomembrane2, elongation at break is more than 60%, Geomembrane selects HDPE geomembrane, and hot strength is more than 17Mpa, and elongation at break is more than 400%;Overlap joint Length is not less than 50cm, and closing on the backfill material at geomembrane is uniform, good cobble, should choose simultaneously Crushing-type is pointed at or the cobble of corner angle.
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