CN109629585A - Novel cofferdam structure and construction method under soft overburden - Google Patents
Novel cofferdam structure and construction method under soft overburden Download PDFInfo
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- CN109629585A CN109629585A CN201910074228.8A CN201910074228A CN109629585A CN 109629585 A CN109629585 A CN 109629585A CN 201910074228 A CN201910074228 A CN 201910074228A CN 109629585 A CN109629585 A CN 109629585A
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- cofferdam
- dike
- weir body
- upstream face
- slope protection
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- 238000010276 construction Methods 0.000 title claims abstract description 78
- 230000004224 protection Effects 0.000 claims abstract description 104
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000004576 sand Substances 0.000 claims description 88
- 239000000463 material Substances 0.000 claims description 31
- 239000004575 stone Substances 0.000 claims description 27
- 239000011248 coating agent Substances 0.000 claims description 24
- 238000000576 coating method Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- 239000004743 Polypropylene Substances 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 20
- -1 polypropylene Polymers 0.000 claims description 20
- 229920001155 polypropylene Polymers 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 17
- 239000004746 geotextile Substances 0.000 claims description 17
- 230000003628 erosive effect Effects 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 239000002689 soil Substances 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 10
- 230000015271 coagulation Effects 0.000 claims description 8
- 238000005345 coagulation Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000002362 mulch Substances 0.000 claims description 4
- 210000000476 body water Anatomy 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 102000002322 Egg Proteins Human genes 0.000 claims 1
- 108010000912 Egg Proteins Proteins 0.000 claims 1
- 210000004681 ovum Anatomy 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 27
- 239000004035 construction material Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/127—Flexible prefabricated covering elements, e.g. mats, strips bags filled at the side
Abstract
The invention discloses novel cofferdam structure and construction method under a kind of soft overburden, the side that meets water at the top of bottom cover layer is provided with upstream face and clashes dike, and land side is provided with back side and clashes dike；The upstream face clashes dike and back side clashes filling between dike and constitutes weir body underwater portion reclamation district；The upstream face, which clashes dike, weir body underwater portion reclamation district and back side and clashes the side that meets water at the top of dike, is provided with weir body upstream face slope protection waterborne, and land side is provided with weir body back side slope protection waterborne；Filling constitutes weir body above water reclamation district between weir body upstream face slope protection waterborne and weir body back side slope protection waterborne；Cofferdam shield roof construction is provided at the top of the weir body above water reclamation district；Leakage preventing structure is provided centrally with along cofferdam structure.It using novel cofferdam structure and construction method under this various soft overburden, ensured engineering safety, shortened the duration, saved project cost.
Description
Technical field
The present invention relates to coffering fields, and in particular to novel cofferdam structure and construction method under soft overburden.
Background technique
Multi purpose project is built near water, and the cofferdam for building water blocking is usually required before construction, forms construction foundation pit, to guarantee
There are earth rock cofferdam, concrete cofferdam, mould sack cofferdam, steel sheet pile cellular cofferdam etc. in dry work, common cofferdam.Common water
Domain earth's surface is largely the soft overburdens such as sand coating, weak soil coating, weir body can with the vertical curtain of geotechnique, mixing pile,
Rotary churning pile etc. is used as seepage proof curtain, and the slope protection mode in cofferdam common are Reynolds slope protection, reinforced gabion slope protection, but construction speed compared with
Slowly, the embankment structure in an opposite direction in cofferdam frequently with bilateral clashes embankment structure, to guarantee that cofferdam is stablized, and these slope protections and embankment structure needs in an opposite direction
A large amount of boulder and other construction materials, while a large amount of block stone Transport Machinery is needed, however cofferdam soft overburden is more loose
Soft, oversize vehicle is difficult to enter, and does not have traffic condition.Cofferdam construction process needs to use a large amount of construction material, faces
The insufficient boulder in water cofferdam purchases boulders to other places, and transportation range is long, it is time-consuming long, while dry season constructs
It is pressed for time, is easy schedule delays, while buying these construction materials and needing a large amount of capital investment.
Summary of the invention
The purpose of the present invention is to solve the deficiency of the above background technology, provides novel cofferdam under a kind of soft overburden
Structure and construction method, the present invention make full use of local sand material, using the method for slush method and rolled-on method to cofferdam
It is filled.Cofferdam, which is filled, is divided into waterborne, underwater two parts construction, meets water in cofferdam underwater portion for upper, middle reaches cofferdam
Face clashes dike and clashes dike using block stone, and back side replaces clashing dike, for downstream cofferdam, upstream face and back side using sand filling bag slope protection
It is all made of sand filling bag and clashes dike；Then leakage preventing structure is built along cofferdam center line to enclose upper, middle reaches in cofferdam above water
Weir, upstream face use mold-bagged concrete slope protection, and back side uses sand filling bag slope protection, for downstream cofferdam, upstream face and backwater
Face is all made of sand filling bag slope protection, and shield roof construction carries out shield top using geotextiles, cobble bed course, grinding coagulation soil, forms transport
Road.The riprap body combined with block stone, the Anti-scouring structure as river bottom protection are arranged using polypropylene fibre.Upper, middle reaches cofferdam backwater
Face replaces clashing dike using sand filling bag slope protection, and downstream cofferdam upstream face and back side are all made of sand filling bag slope protection, and fill
From local sand, these successfully solve the problems, such as that construction site lacks the materials such as block stone, adopt sand inside sand pocket
With mold-bagged concrete slope protection and sand filling bag slope protection, other protective slope structures are compared, are convenient for mechanized construction, and safe and reliable.
The riprap body combined with block stone is arranged with polypropylene fibre, protection against erosion performance is strong, using novel cofferdam under this various soft overburden
Structure and construction method have ensured engineering safety, have shortened the duration, save project cost.
In order to realize above-mentioned technical characteristic, the object of the present invention is achieved like this: novel cofferdam under soft overburden
Structure, it includes the bottom cover layer that entire cofferdam bottom is arranged in, and the side that meets water at the top of the bottom cover layer, which is provided with, meets
The water surface clashes dike, and land side is provided with back side and clashes dike；The upstream face clashes dike and back side clashes filling between dike and constitutes weir body water
Lower part reclamation district；The upstream face, which clashes dike, weir body underwater portion reclamation district and back side and clashes the side that meets water at the top of dike, to be provided with
Weir body upstream face slope protection waterborne, land side are provided with weir body back side slope protection waterborne；Weir body upstream face slope protection waterborne and weir
Filling constitutes weir body above water reclamation district between body back side slope protection waterborne；It is set at the top of the weir body above water reclamation district
It is equipped with cofferdam shield roof construction；Along the center of cofferdam structure, and run through bottom cover layer and weir body underwater portion reclamation district institute
It installs in place and is equipped with leakage preventing structure；Through the center of weir body above water reclamation district, and it is located at the top of leakage preventing structure and is provided with
Composite earthwork film layer.
The bottom cover layer uses Deep mulch layer and shallow-layer coating double-layer structure or more layers tectum structure,
The bottom cover layer uses soft overburden or hard coating.
The soft overburden uses weak soil coating or sand coating；The hard coating uses block stone coating
Or mixing sand gravel material coating.
The upstream face clashes dike and clashes dike using block stone, and sand filling bag can also be used and clash the combined pattern of dike, or both.
The cofferdam shield roof construction includes the geotextile layer being laid at the top of the body above water reclamation district of weir, in geotextile layer
Upper laying cobble bed course protects top layer using grinding coagulation soil on cobble bed course.
The upstream face that the upstream face clashes dike is provided with erosion control rockfill river bottom protection, clashes in erosion control rockfill river bottom protection with upstream face
It is equipped with polypropylene fibre between dike and bottom cover layer and arranges layer, the upstream face that upstream face clashes dike is provided with mixing sand gravel material layer.
Weir body upstream face slope protection waterborne and weir body back side slope protection waterborne all use mold-bagged concrete slope protection or filling
Sandbag revetment, or both combined pattern.
The leakage preventing structure is handled using plastic concrete cut-off wall or using high pressure jet grouting, and composite earthwork can also be used
Film or their combination pattern；
Weak material or stiff materials can be used in the weir body underwater portion reclamation district and weir body above water reclamation district.
The weakness material Extra-fine sand, coarse sand or weak soil；The stiff materials are using block stone or mixing sand gravel material.
The construction method of novel cofferdam structure under soft overburden described in any one, it the following steps are included:
Step1: dike construction in an opposite direction: for upper, middle reaches cofferdam, upstream face clashes dike using dump truck haul to construction part discharging,
Using method of attacking and occupying, back side clashes dike and clashes dike using sand filling bag for discharging；And for downstream cofferdam, it is equal that upstream face and back side clash dike
Dike is clashed using sand filling bag；
Step2: the construction of weir body underwater portion: for upper, middle reaches cofferdam, cofferdam weir body, which fills, takes hydraulic fill method and rolled-on method
The mutually method of knot carries out filling for mixing sand gravel material layer when upstream face is clashed after the completion of dike attacks and occupies, behind leakage preventing structure start tightly
With construction, and for downstream cofferdam, after the completion of sand filling bag clashes dike, weir body underwater portion reclamation district and leakage preventing structure are carried out
Construction；
Step3: the construction of weir body above water: the cleaning of leakage preventing structure and composite earthwork film layer binding site is carried out first, then
Into the laying of composite earthwork film layer, composite earthwork film layer laying speed should be with weir body above water reclamation district filling construction progress phase
It adapts to；Then cofferdam slope protection construction is carried out, the slope protection form in cofferdam has mold-bagged concrete slope protection and sand filling bag slope protection, for
Upper, middle reaches cofferdam, upstream face use mold-bagged concrete slope protection, and back side uses sand filling bag slope protection, and for downstream cofferdam, it encloses
The back side and upstream face on weir are all made of sand filling bag slope protection, wherein mold-bagged concrete slope protection be by being first laid with mould bag, then into
The filling of row concrete, sand filling bag slope protection are then to carry out the filling of sand by being first laid with polypropylene fibre cloth bag；Finally carry out cofferdam
The construction of shield top, the construction of shield top need first to be laid with geotextiles, cobble are then laid in geotextiles, finally carry out grinding coagulation soil again
Shield top；
Step4: the construction of cofferdam river bottom protection: cofferdam river bottom protection is arranged by the way of layer combines using erosion control rockfill river bottom protection and polypropylene fibre and is constructed,
Polypropylene fibre is made into geotextile Polypropylene and arranges layer, is then connected block stone with arrangement, while sinking.
The method have the advantages that:
Present invention setting is built in multi purpose project near water, and for upper, middle reaches cofferdam, upstream face is clashed dike using block stone and attacked and occupied
Method carries out dike in an opposite direction, and back side replaces clashing dike using sand filling bag slope protection, and upstream face uses mold-bagged concrete slope protection, and back side uses
Sand filling bag slope protection, for downstream cofferdam, upstream face and back side are all made of sand filling bag and clash dike.Upstream face and back side are adopted
With sand filling bag slope protection.Upper, middle reaches cofferdam back side using sand filling bag slope protection replace clashing dike and downstream cofferdam upstream face and
Back side clashes dike, sand filling bag slope protection using sand filling bag, and the sand of sand filling bag derives from local material, these successes
Solve the problems, such as that construction site lacks the materials such as block stone.Mold-bagged concrete slope protection compares other slope protection knots with sand filling bag slope protection
Structure, convenient for mechanization and securely and reliably, being arranged with polypropylene fibre with block masonry is riprap body, and protection against erosion performance is strong, passes through
The novel cofferdam structure of different location is swum in upper, middle and lower, organizes integral large-scale cofferdam structure.The present invention, which has, to be shortened the construction period, drops
Low project cost ensures the advantages that engineering safety, has preferable application in fields such as water transport, seashore, dyke, water conservancy, bridges
Prospect.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the present invention on river, the section of middle reaches, when leakage preventing structure uses plastic concrete cut-off wall, soft overburden
Lower novel cofferdam structural schematic diagram.
Fig. 2 is the present invention on river, the section of middle reaches, novel under soft overburden to enclose when leakage preventing structure uses high pressure jet grouting
Weir structural schematic diagram.
Fig. 3 is the present invention in lower reaches of river section, new under soft overburden when leakage preventing structure uses plastic concrete cut-off wall
Type cofferdam structure schematic diagram.
Fig. 4 is the present invention in lower reaches of river section, when leakage preventing structure uses high pressure jet grouting, novel cofferdam knot under soft overburden
Structure schematic diagram.
Fig. 5 is the present invention on river, the section of middle reaches, and leakage preventing structure uses plastic concrete cut-off wall, and upstream face, which uses, to be filled
When back-up sand bag clashes dike, novel cofferdam structural schematic diagram under soft overburden.
Fig. 6 is the present invention on river, the section of middle reaches, and leakage preventing structure uses high pressure jet grouting, and upstream face is clashed using sand filling bag
When dike, novel cofferdam structural schematic diagram under soft overburden.
Fig. 7 is the present invention on river, the section of middle reaches, and leakage preventing structure uses composite geo-membrane, and upstream face clashes dike using block stone,
Weir body is filled using sand filling bag, novel cofferdam structural schematic diagram under soft overburden.
Fig. 8 is the cross-sectional view of erosion control rockfill river bottom protection.
Fig. 9 is the cross-sectional view that upstream face clashes dike.
Figure 10 is the schematic diagram of mold-bagged concrete slope protection.
Figure 11 is the schematic diagram of sand filling bag slope protection.
Figure 12 is to mix sand gravel material to pile up schematic diagram.
Figure 13 is plastic concrete cut-off wall structural schematic diagram.
Figure 14 is high pressure jet grouting structural schematic diagram.
Figure 15 is cofferdam shield roof construction schematic diagram.
Figure 16 .1 is on river, middle reaches section, and dike is constructed schematic diagram in an opposite direction.
Figure 16 .2 is lower reaches of river section, in an opposite direction dike construction schematic diagram.
Figure 16 .3 is on river, middle reaches section, and upstream face clashes dike using sand filling bag, and dike is constructed schematic diagram in an opposite direction.
Figure 16 .4 is on river, middle reaches section, and leakage preventing structure uses composite geo-membrane, meets water and clash dike using block stone, weir body is adopted
It is filled with sand filling bag, in an opposite direction dike construction schematic diagram.
Figure 16 .5 is on river, middle reaches section, when leakage preventing structure uses plastic concrete cut-off wall, the construction of weir body underwater portion
Schematic diagram.
Figure 16 .6 is on river, middle reaches section, and when leakage preventing structure uses high pressure jet grouting, weir body underwater portion is constructed schematic diagram.
Figure 16 .7 is lower reaches of river section, and when leakage preventing structure uses plastic concrete cut-off wall, body underwater portion construction in weir is shown
It is intended to.
Figure 16 .8 is lower reaches of river section, when leakage preventing structure uses high pressure jet grouting, weir body underwater portion construction schematic diagram.
Figure 16 .9 is on river, middle reaches section, and leakage preventing structure uses plastic concrete cut-off wall, and upstream face uses sand filling bag
In an opposite direction when dike, weir body underwater portion construction schematic diagram.
Figure 16 .10 is on ayer, middle reaches section, and leakage preventing structure uses high pressure jet grouting, and upstream face is clashed using sand filling bag
When dike, weir body underwater portion construction schematic diagram.
Figure 16 .11 is on river, middle reaches section, and leakage preventing structure uses composite geo-membrane, meets water and clash dike using block stone, weir body is adopted
It is filled with sand filling bag, weir body underwater portion construction schematic diagram.
Figure 16 .12 is on river, middle reaches section, and weir body above water is constructed schematic diagram.
Figure 16 .13 is lower reaches of river section, weir body above water construction schematic diagram.
Figure 16 .14 is on river, middle reaches section, and leakage preventing structure uses composite geo-membrane, meets water and clash dike using block stone, weir body is adopted
It is filled with sand filling bag, weir body above water construction schematic diagram.
Figure 16 .15 is cofferdam river bottom protection construction schematic diagram.
In figure: upstream face clashes dike 1, mixing sand gravel material layer 2, back side and clashes dike 3, weir body underwater portion reclamation district 4, antiseepage
Structure 5, weir body above water reclamation district 6, composite earthwork film layer 7, geotextiles 8, cobble bed course 9, grinding coagulation soil shield top 10, weir
Body upstream face slope protection 11 waterborne, weir body back side slope protection 12 waterborne, polypropylene fibre are arranged layer 13, erosion control rockfill river bottom protection 14, shallow-layer and are covered
Cap rock 15, Deep mulch layer 16.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
Embodiment 1:
Fig. 1-15 is please referred to, novel cofferdam structure under soft overburden, it includes the bottom covering that entire cofferdam bottom is arranged in
Layer, the side that meets water at the top of the bottom cover layer is provided with upstream face and clashes dike 1, and land side is provided with back side and clashes dike 3；It is described to meet
The water surface clashes dike 1 and back side clashes filling between dike 3 and constitutes weir body underwater portion reclamation district 4；The upstream face clashes dike 1, weir body water
The top that lower part reclamation district 4 and back side clash dike 3 side that meets water is provided with weir body upstream face slope protection 11 waterborne, and land side is provided with
Weir body back side slope protection 12 waterborne；Structure is filled between weir body upstream face slope protection 11 waterborne and weir body back side slope protection 12 waterborne
At weir body above water reclamation district 6；The top of the weir body above water reclamation district 6 is provided with cofferdam shield roof construction；Along enclosing
The center of weir structure, and bottom cover layer and 4 position of weir body underwater portion reclamation district are provided with leakage preventing structure 5；
Through the center of weir body above water reclamation district 6, and the top for being located at leakage preventing structure 5 is provided with composite earthwork film layer 7.By adopting
Dike, downstream cofferdam upstream face and back side in an opposite direction are replaced using sand filling bag slope protection with the upper of above structure, middle reaches cofferdam back side
It is all made of sand filling bag slope protection, and the sand inside sand filling bag, from local sand, these successfully solve construction
Scene lacks the problem of materials such as block stone；Using mold-bagged concrete slope protection and sand filling bag slope protection, other protective slope structures are compared, just
In mechanized construction, and it is safe and reliable.The riprap body combined with block stone is arranged with polypropylene fibre, protection against erosion performance is strong, uses
Novel cofferdam structure and construction method under this various soft overburden have ensured engineering safety, have shortened the duration, save engineering and make
Valence.
Further, the bottom cover layer uses Deep mulch layer 16 and 15 double-layer structure of shallow-layer coating or more
Layer tectum structure, the bottom cover layer use soft overburden or hard coating.
Further, the soft overburden uses weak soil coating or sand coating；The hard coating uses
Block stone coating or mixing sand gravel material coating.
Further, the upstream face clashes dike 1 and clashes dike using block stone, and sand filling bag can also be used and clash dike, or both group
The pattern of conjunction.
Further, the cofferdam shield roof construction includes the geotextile layer for being laid on 6 top of weir body above water reclamation district
8, it is laid with cobble bed course 9 in geotextile layer 8, top layer 10 is protected using grinding coagulation soil on cobble bed course 9.
Further, the upstream face that the upstream face clashes dike 1 is provided with erosion control rockfill river bottom protection 14, protects in erosion control rockfill
Bottom 14 and upstream face, which are clashed, to be equipped with polypropylene fibre and arranges layer 13 between dike 1 and bottom cover layer, clash the upstream face setting of dike 1 in upstream face
There is mixing sand gravel material layer 2.
Further, weir body upstream face slope protection 11 waterborne and weir body back side slope protection 12 waterborne all use mould bag coagulation
Native slope protection or sand filling bag slope protection, or both combined pattern.
Further, the leakage preventing structure 5 is handled using plastic concrete cut-off wall or using high pressure jet grouting, can also be used
Composite geo-membrane or their combination pattern.
Further, the weir body underwater portion reclamation district 4 and weir body above water reclamation district 6 can be used weak material or
Stiff materials.
Further, the weak material Extra-fine sand, coarse sand or weak soil；The stiff materials are using block stone or mixing gravel
Building stones.
.1 ~ 16.15 Figure 16 are the construction process figures of novel cofferdam structure under soft overburden.Referring to figure, construction procedure is such as
Under:
The construction method of novel cofferdam structure under soft overburden described in any one, it the following steps are included:
Step1: dike construction in an opposite direction: for upper, middle reaches cofferdam, upstream face clashes dike 1 using dump truck haul to construction part discharging,
Using method of attacking and occupying, back side clashes dike 3 and clashes dike using sand filling bag for discharging；And dike is clashed for downstream cofferdam, upstream face and back side
It is all made of sand filling bag and clashes dike；
Step2: the construction of weir body underwater portion: for upper, middle reaches cofferdam, cofferdam weir body, which fills, takes hydraulic fill method and rolled-on method
The mutually method of knot carries out filling for mixing sand gravel material layer 2 when upstream face is clashed after the completion of dike 1 attacks and occupies, behind leakage preventing structure 5 open
Beginning follows construction closely, and for downstream cofferdam, after the completion of sand filling bag clashes dike, carry out weir body underwater portion reclamation district 4 and antiseepage
The construction of structure 5；
Step3: the construction of weir body above water: the cleaning of leakage preventing structure 5 and 7 binding site of composite earthwork film layer is carried out first, so
The laying of laggard composite earthwork film layer 7,7 laying speed of composite earthwork film layer should be with 6 filling constructions of weir body above water reclamation district
Progress is adapted；Then cofferdam slope protection construction is carried out, the slope protection form in cofferdam has mold-bagged concrete slope protection and sand filling bag slope protection,
For upper, middle reaches cofferdam, upstream face uses mold-bagged concrete slope protection, and back side uses sand filling bag slope protection, and downstream is enclosed
Weir, the back side and upstream face in cofferdam are all made of sand filling bag slope protection, wherein mold-bagged concrete slope protection be by being first laid with mould bag,
Carry out the filling of concrete again, sand filling bag slope protection is then to carry out the filling of sand by being first laid with polypropylene fibre cloth bag；Finally carry out
Cofferdam shield top construction, the construction of shield top need first to be laid with geotextiles 8, cobble are then laid in geotextiles 8, is finally rolled again
Concrete shield top 10；
Step4: the construction of cofferdam river bottom protection: cofferdam river bottom protection is arranged by the way of layer 13 combines using erosion control rockfill river bottom protection 14 and polypropylene fibre and is applied
Work is made into polypropylene fibre with geotextile Polypropylene and arranges layer, then connects block stone with arrangement, while sinking.
Above-described embodiment is used to illustrate the present invention, rather than limits the invention, in spirit of the invention and
In scope of protection of the claims, to any modifications and changes that the present invention makes, protection scope of the present invention is both fallen within.
Claims (10)
1. novel cofferdam structure under soft overburden, which is characterized in that it includes the bottom covering that entire cofferdam bottom is arranged in
Layer, the side that meets water at the top of the bottom cover layer is provided with upstream face and clashes dike (1), and land side is provided with back side and clashes dike (3)；Institute
State that upstream face clashes dike (1) and back side clashes filling between dike (3) and constitutes weir body underwater portion reclamation district (4)；The upstream face is clashed
Dike (1), weir body underwater portion reclamation district (4) and back side clash the side that meets water at the top of dike (3) and are provided with weir body upstream face shield waterborne
Slope (11), land side are provided with weir body back side slope protection (12) waterborne；Weir body upstream face slope protection (11) waterborne and weir body water
Filling constitutes weir body above water reclamation district (6) between upper back side slope protection (12)；The weir body above water reclamation district (6)
Top is provided with cofferdam shield roof construction；It is filled out along the center of cofferdam structure, and through bottom cover layer and weir body underwater portion
It builds area (4) position and is provided with leakage preventing structure (5)；Through the center of weir body above water reclamation district (6), and it is located at antiseepage knot
Composite earthwork film layer (7) are provided at the top of structure (5).
2. novel cofferdam structure under soft overburden according to claim 1, it is characterised in that: the bottom cover layer is adopted
It is adopted with Deep mulch layer (16) and shallow-layer coating (15) double-layer structure or more layers tectum structure, the bottom cover layer
With soft overburden or hard coating.
3. novel cofferdam structure under soft overburden according to claim 2, it is characterised in that: the soft overburden is adopted
With weak soil coating or sand coating；The hard coating is using block stone coating or mixing sand gravel material coating.
4. novel cofferdam structure under soft overburden according to claim 1, it is characterised in that: the upstream face clashes dike
(1) dike is clashed using block stone, sand filling bag can also be used and clash the combined pattern of dike, or both.
5. novel cofferdam structure under soft overburden according to claim 1, it is characterised in that: roof construction is protected in the cofferdam
Including the geotextile layer (8) being laid at the top of weir body above water reclamation district (6), cobble bed course is laid on geotextile layer (8)
(9), using grinding coagulation soil shield top layer (10) on cobble bed course (9).
6. novel cofferdam structure under soft overburden according to claim 1, it is characterised in that: the upstream face clashes dike
(1) upstream face is provided with erosion control rockfill river bottom protection (14), clashes dike (1) and bottom in erosion control rockfill river bottom protection (14) and upstream face
It is equipped with polypropylene fibre between coating and arranges layer (13), the upstream face that upstream face clashes dike (1) is provided with mixing sand gravel material layer
(2).
7. novel cofferdam structure under soft overburden according to claim 1, it is characterised in that: the weir body is waterborne to meet water
Face slope protection (11) and weir body back side slope protection (12) waterborne all use mold-bagged concrete slope protection or sand filling bag slope protection, or both group
The pattern of conjunction.
8. novel cofferdam structure under soft overburden according to claim 1, it is characterised in that: the leakage preventing structure (5)
It is handled using plastic concrete cut-off wall or using high pressure jet grouting, composite geo-membrane or their combination pattern can also be used；
Weak material or stiff materials can be used in the weir body underwater portion reclamation district (4) and weir body above water reclamation district (6).
9. novel cofferdam structure under soft overburden according to claim 8, it is characterised in that: the weakness material powder is thin
Sand, coarse sand or weak soil；The stiff materials are using block stone or mixing sand gravel material.
10. the construction method of novel cofferdam structure under soft overburden described in claim 1-9 any one, it is characterised in that it
The following steps are included:
Step1: dike construction in an opposite direction: for upper, middle reaches cofferdam, upstream face is clashed dike (1) and is unloaded using dump truck haul to construction part
Material, using method of attacking and occupying, back side clashes dike (3) and clashes dike using sand filling bag for discharging；And for downstream cofferdam, upstream face and back side
Dike is all made of sand filling bag and clashes dike in an opposite direction；
Step2: the construction of weir body underwater portion: for upper, middle reaches cofferdam, cofferdam weir body, which fills, takes hydraulic fill method and rolled-on method
The mutually method of knot carries out filling for mixing sand gravel material layer (2) when upstream face is clashed after the completion of dike (1) attacks and occupies, behind leakage preventing structure
(5) start to follow construction closely, and for downstream cofferdam, after the completion of sand filling bag clashes dike, carry out weir body underwater portion reclamation district (4)
With the construction of leakage preventing structure (5)；
Step3: the construction of weir body above water: progress leakage preventing structure (5) and composite earthwork film layer (7) binding site is clear first
Reason, then into the laying of composite earthwork film layer (7), composite earthwork film layer (7) laying speed should be with weir body above water reclamation district
(6) filling construction progress is adapted；Then cofferdam slope protection construction is carried out, the slope protection form in cofferdam has mold-bagged concrete slope protection and fills
Sandbag revetment is filled out, for upper, middle reaches cofferdam, upstream face uses mold-bagged concrete slope protection, and back side uses sand filling bag slope protection, and
For downstream cofferdam, the back side and upstream face in cofferdam are all made of sand filling bag slope protection, and wherein mold-bagged concrete slope protection is to pass through
It is first laid with mould bag, then carries out the filling of concrete, sand filling bag slope protection is then to carry out filling for sand by being first laid with polypropylene fibre cloth bag
It fills out；Cofferdam shield top construction is finally carried out, the construction of shield top needs first to be laid with geotextiles (8), is then laid with ovum on geotextiles (8)
Stone finally carries out grinding coagulation soil shield top (10) again；
Step4: the construction of cofferdam river bottom protection: cofferdam river bottom protection arranges the side of layer (13) combination using erosion control rockfill river bottom protection (14) and polypropylene fibre
Formula construction, is made into polypropylene fibre with geotextile Polypropylene and arranges layer, then connect block stone with arrangement, while sinking.
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| CN110397051A (en) * | 2019-07-09 | 2019-11-01 | 中国铁建港航局集团有限公司 | A kind of cofferdam structure and construction method |
| CN110565592A (en) * | 2019-08-12 | 2019-12-13 | 长江勘测规划设计研究有限责任公司 | cofferdam bottom pressure-bearing block structure suitable for unevenness and bearing capacity of canal lining |
| CN110629771A (en) * | 2019-09-02 | 2019-12-31 | 中国水利水电第五工程局有限公司 | Construction method of multi-branch river multi-river core island cofferdam |
| CN111501652A (en) * | 2020-03-18 | 2020-08-07 | 中铁十四局集团第四工程有限公司 | Comprehensive treatment method for sand bed riverway in plain area |
| CN111733842A (en) * | 2020-06-19 | 2020-10-02 | 三峡大学 | Cofferdam construction method and cofferdam structure |
| CN112832274A (en) * | 2020-12-31 | 2021-05-25 | 广东大禹水利建设有限公司 | Construction method of cofferdam |
| CN115450236A (en) * | 2022-09-15 | 2022-12-09 | 中国葛洲坝集团国际工程有限公司 | Cofferdam anti-seepage structure and construction method thereof |
| CN116043884A (en) * | 2022-12-19 | 2023-05-02 | 保利长大工程有限公司 | Construction method for constructing island by using flexible cofferdam of offshore anchor ingot |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110397051A (en) * | 2019-07-09 | 2019-11-01 | 中国铁建港航局集团有限公司 | A kind of cofferdam structure and construction method |
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| CN110629771A (en) * | 2019-09-02 | 2019-12-31 | 中国水利水电第五工程局有限公司 | Construction method of multi-branch river multi-river core island cofferdam |
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| CN111733842A (en) * | 2020-06-19 | 2020-10-02 | 三峡大学 | Cofferdam construction method and cofferdam structure |
| CN112832274A (en) * | 2020-12-31 | 2021-05-25 | 广东大禹水利建设有限公司 | Construction method of cofferdam |
| CN115450236A (en) * | 2022-09-15 | 2022-12-09 | 中国葛洲坝集团国际工程有限公司 | Cofferdam anti-seepage structure and construction method thereof |
| CN116043884A (en) * | 2022-12-19 | 2023-05-02 | 保利长大工程有限公司 | Construction method for constructing island by using flexible cofferdam of offshore anchor ingot |
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