CN110453703A - A kind of steel sheet pile cofferdam construction method - Google Patents
A kind of steel sheet pile cofferdam construction method Download PDFInfo
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- CN110453703A CN110453703A CN201910590919.3A CN201910590919A CN110453703A CN 110453703 A CN110453703 A CN 110453703A CN 201910590919 A CN201910590919 A CN 201910590919A CN 110453703 A CN110453703 A CN 110453703A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 138
- 239000010959 steel Substances 0.000 title claims abstract description 138
- 238000010276 construction Methods 0.000 title claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000009412 basement excavation Methods 0.000 claims abstract description 17
- 238000009434 installation Methods 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 238000003892 spreading Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 4
- 235000014121 butter Nutrition 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000005476 soldering Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000011900 installation process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 2
- 230000000916 dilatatory effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000008719 thickening Effects 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
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of steel sheet pile cofferdam construction methods, including following construction procedure: S1: the preparation before construction；S2: positioning measurement；S3: leading truck construction；S4: steel sheet pile construction；S5: leading truck is removed, provides space for subsequent construction；S6: inner support construction, groove welding radial type bracket on the inside of steel sheet pile is as support platform, inner support is lifted in support platform, then respectively that three groups of inner supports are successively whole from top to bottom by hangar system to hang installation to designed elevation, during hanging, radial type bracket is opened, is embedded in it in groove on the inside of steel sheet pile；S7: it draws water and inhales mud, excavation pit；S8: underwater back cover construction；S9: cofferdam demolition.It is an advantage of the invention that improving construction efficiency, a possibility that cofferdam deforms in the construction process and construction risk are reduced, solves influence of the fluctuation tide to cofferdam construction.
Description
Technical field
The present invention relates to cofferdam construction technical fields, more particularly, to a kind of steel sheet pile cofferdam construction method.
Background technique
Cofferdam refers in hydraulic engineering construction, to build permanent water conservancy projects, the provisional building enclosure built.Its
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.
In bridge foundation construction, when bridge pier, stylobate plinth are located at earth's surface water level or less, according to local material build at
Various forms of earth banks；Water is compared with depth and pile plank or steel sheet pile (single or double layer) cofferdam can be used in the biggish river of flow velocity,
And much can double-layer thin wall steel cofferdams, the effect in cofferdam not only can with waterproof, enclose water, but also the crater wall of foundation pit can be supported.
Mainly there are steel sheet-pile cofferdam, lock steel pipe pile cofferdam, Double-Wall Steel Boxed Cofferdam etc. in common deep water foundation cofferdam.Steel sheet pile encloses
Weir is a kind of most common sheet-pile cofferdam, and intensity is high, is easy to squeeze into hard soil layer；It can be in deep subaqueous work, when necessary plus tiltedly
Support becomes an inclosure.Waterproof performance is good；The cofferdam of various shapes can be formed as needed, and can be repeatedly used, therefore,
Its is widely used.
But this technology is during construction, there are cofferdam deformation, the period is long, risk is big the problems such as, and be difficult to
Eliminate influence of the fluctuation tide to cofferdam construction.
Summary of the invention
The object of the present invention is to provide a kind of steel sheet pile cofferdam construction methods, its advantage is that improving construction efficiency, reduce
A possibility that cofferdam deforms in the construction process and construction risk, solve influence of the fluctuation tide to cofferdam construction.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of steel sheet pile cofferdam construction side
Method, including following construction procedure:
S1: the preparation before construction；
S2: positioning measurement accurately measures four angle points in cofferdam according to the design size in cofferdam, is used as benchmark by piling,
And flexible graticule is set in the outer side wall of four piles；
S3: leading truck construction installs steel pile casting according to construction drawing, guarantees the verticality of steel pile casting in installation process, protect in steel
Leading truck is weldingly fixed on bracket, on leading truck by welded formula bracket as support by crossbeam on the outer wall of cylinder
The radial width of the double-deck waling is greater than the 8-10mm of steel sheet pile insertion width；
S4: steel sheet pile construction is divided to two flowing water sections to carry out inserting piling, special-shaped sheet pile to steel sheet pile by hanging device and hydraulic vibration hammer
Close up, the rectangle cofferdam that formation is made of several steel sheet piles, in work progress, steel sheet pile is guaranteed by the mode for repeatedly surveying vertical
Verticality installs communicating valve on the side wall of cofferdam, use it is prefabricated, guarantee fluctuation time of tide cofferdam inside and outside hydraulic pressure it is consistent；
S5: leading truck is removed, provides space for subsequent construction；
S6: inner support construction, the groove welding radial type bracket on the inside of steel sheet pile is as support platform, in support platform
Hoisting inner support, it is then respectively that three groups of inner supports are successively whole from top to bottom by hangar system to hang installation to design mark
Height during hanging, opens radial type bracket, is embedded in it in groove on the inside of steel sheet pile；
S7: it draws water and inhales mud, excavation pit；
S8: underwater back cover construction；
S9: cofferdam demolition.
Through the above technical solutions, the present invention is by the way of first supporting and excavating afterwards, when reducing excavation cofferdam due to by
Power is uneven and a possibility that deform, meanwhile, the setting of three inner supports substantially increases the stability and stress energy in cofferdam
Power reduces excavation difficulty, since inner support is integrally transferred under water, substantially reduce and excavate the period, improve construction effect
Rate；And the setting of communicating valve, it ensure that water level is consistent inside and outside cofferdam, effective solution fluctuation time of tide cofferdam is due to external and internal pressure
The problem of poor and influence is constructed.
The present invention is further arranged to: include following construction procedure in the S1:
A1: determining the structural parameters of steel sheet pile according to water level and geological conditions, according to the space of the size of cushion cap and required operation
It determines the overall dimensions of steel sheet-pile cofferdam, and reserves enough steel sheet piles；
A2: pre-manufactured steel sheet pile first passes through groove welding using similar shaped steel plate pile and carries out spreading, then again in the connection of two steel sheet piles
Place's reinforcement of weld plate is reinforced；
A3: Inspection carries out Deformation checking, surface inspection, classification and number to steel sheet pile, after passed examination, is put down by two groups
Vehicle is transported to harbour, at most allows to stack four layers by pitching pile sequence pile, every layer separates height difference with chock and is not greater than 10mm, up and down
Layer chock middle line will be in same vertical line, and allowable error is not greater than 20mm；
A4: cleaning riverbed excludes the ironware that Ha Noi is fallen into work progress early period, avoids tired to later period steel sheet-pile cofferdam bring
It is difficult.
Through the above technical solutions, in pre-manufactured steel sheet pile, the setting of securing plate is substantially increased and is connected between two steel sheet piles
The bonding strength at place；By carrying out Inspection to steel sheet pile, reduces steel sheet pile and occur substandard products in actual use
It may；By clearing up riverbed, going on smoothly for construction in later period ensure that.
The present invention is further arranged to: further including making in the A3 to one piece of stub with the long 2-3m of model of two sides fore shaft
By test, being pulled through with 2-3 people is advisable, or dilatory, the maximum drawbar pull≤KN, if fore shaft can't pass or stake using hoist engine
When body has bending, distortion, dog leg defect, using clod wash, heat strikes (temperature be no more than 800 ~ 1000 DEG C), soldering, riveting mend, cut off or
The method of spreading is rebuild.
Through the above technical solutions, first passing through test before construction to reject or correct undesirable steel sheet pile, guaranteeing
Construction requirement.
The present invention is further arranged to: include following construction procedure in the S4:
B1: the brushing butter at the fore shaft of every piece of steel sheet pile reduces frictional force when inserting piling；
B2: horizontal and vertical transport is carried out to steel sheet pile by telpher, steel sheet pile is transported to designated position, and be sequentially inserted into
In manned steel sheet pile lock；
B3: with 3-5 block steel sheet pile be one group, by group inserting piling on earth, during inserting piling, the steel plate in first inserting piling upstream middle position
Stake, then to two sides inserting piling, finally closes up in downstream.
Through the above technical solutions, frictional resistance of brushing butter when being for reducing inserting piling between adjacent steel sheet pile；Pass through
Inserting piling by group can effectively improve the efficiency of inserting piling, improve processing progress.
The present invention is further arranged to: in the S4 further include:
B4: it is bonded waterstop at the lock of adjacent steel sheet pile, guarantees the impermeability of steel sheet-pile cofferdam.
Through the above technical solutions, the setting of waterstop reduces river water and penetrates into cofferdam for improving the leakproofness in cofferdam
A possibility that.
The present invention is further arranged to: include following construction procedure in the S6:
C1: radial type bracket includes upper bracket and lower bracket, and wherein one end of the two passes through fixed plate respectively and steel sheet pile welds,
The other end is connected by bolt, upper bracket and it is lower be between bracket and fixed plate it is hinged, after removing bolt, upper bracket and lower bracket
It is embedded in the groove of steel sheet pile；
C2: inner support is lifted to radial type bracket by hanging device using prefabricated；
C3: using steel pile casting as support counter-force distribution beam, jack and sunpender are installed respectively, form hangar system, open hinge
It connects formula bracket and is jacked by jack, transfer inner support to designed elevation；
C4: fixed inner support is hung by ten round steel, one end of round steel is connect with the pin shaft of inner support side, and the other end passes through
Steel plate is weldingly fixed in the groove of steel sheet pile；
C5: repeat the above steps C1, C2, C3, C4, three inner supports being sequentially completed above riverbed.
Through the above technical solutions, can be improved the efficiency of inner support installation, and since inner support is using prefabricated, In
During installation, it need to only be lifted to underwater designed elevation, simple, convenient construction.
The present invention is further arranged to: in the S6 further include:
C6: it by the gap length at place every between diver's subaqueous survey cofferdam and inner support, processes super cushion block and is installed
To gap, guarantee that inner support is close to cofferdam.
Through the above technical solutions, the setting of super cushion block, for improving the stability after inner support is installed.
The present invention is further arranged to: include following construction procedure in the S7:
D1: communicating valve is closed；
D2: the water in cofferdam is extracted out by water pump；
D3: the mud of cofferdam bottom is sucked out to by suction dredge and is carried out excavation of foundation pit, until being excavated to the 4th inner support absolute altitude
And it is installed, it then proceedes to draw water and inhales mud, excavation pit to designing substrate；
D4: sandstone is backfilled inside to cofferdam and carries out levelling and tamps.
Through the above technical solutions, the setting of backfill sandstone, for improving the flatness in riverbed.
The present invention is further arranged to: include following construction procedure in the S8:
E1: pumping pours bottom concrete；
E2: after bottom concrete intensity reaches standard, laying water-proof coiled material；
E3: pumping pours second layer bottom concrete on waterproof roll.
Through the above technical solutions, the setting of waterproof roll, for improving the function of substrate antiseepage；Two layers of bottom concrete
Setting improve the bearing capacity in its work progress for reinforcing to substrate.
The present invention is further arranged to: include following construction procedure in the S9:
F1: removing the 4th inner support, carries out cushion cap pier construction；
F2: backfilling rubble between cushion cap and steel sheet pile, and casting concrete is equal with cushion cap face, removes third road inner support；
F3: it is filled to second inner support in cofferdam once at 50cm, removes second inner support；
F4: opening communicating valve, during low tide, removes first of inner support and extracts steel sheet pile.
Through the above technical solutions, removing first of inner support and steel sheet pile, during low tide for reducing wind is removed
Construction safety is improved in danger.
In conclusion advantageous effects of the invention are as follows:
1, the present invention is by the way of first supporting and excavating afterwards, and what cofferdam occurred deforming due to unbalance stress when reducing excavation can
Energy property, meanwhile, the setting of three inner supports substantially increases the stability and stress-bearing capability in cofferdam, reduces excavation difficulty, by
It is integrally transferred under water in inner support, therefore, substantially reduces and excavate the period, improve construction efficiency, and the setting of communicating valve, it protects
It is consistent water level inside and outside cofferdam is demonstrate,proved, the problem of effective solution fluctuation time of tide cofferdam influences construction due to internal and external pressure difference；
2, construction requirement is guaranteed for rejecting or correcting undesirable steel sheet pile by the setting of test；
3, the setting of waterstop reduces a possibility that river water penetrates into cofferdam for improving the leakproofness in cofferdam；
4, the setting of waterproof roll, for improving the function of substrate antiseepage；The setting of two layers of bottom concrete, for substrate into
Row is reinforced, and the bearing capacity in its work progress is improved.
Specific embodiment
For a kind of steel sheet pile cofferdam construction method disclosed by the invention, including following construction procedure:
S1: the preparation before construction；S2: positioning measurement；S3: leading truck construction；S4: steel sheet pile construction；S5: guiding is removed
Frame；S6: inner support construction；S7: it draws water and inhales mud, excavation pit；S8: underwater back cover construction；S9: cofferdam demolition.
Wherein, including construction procedure in detail below in S1:
A1: determining the structural parameters of steel sheet pile according to water level and geological conditions, according to the space of the size of cushion cap and required operation
It determines the overall dimensions of steel sheet-pile cofferdam, and reserves enough steel sheet piles；
A2: after the specification of steel sheet pile determines, start pre-manufactured steel sheet pile, when prefabricated, using similar shaped steel plate pile, first pass through groove welding
Spreading is carried out, is then reinforced again in the junction reinforcement of weld plate of two steel sheet piles, to improve the stabilization of steel plate pilework
Property and fixing guarantee construction quality；
A3: Inspection carries out Deformation checking, surface inspection, classification and number to steel sheet pile, after passed examination, is put down by two groups
Vehicle is transported to harbour, at most allows to stack four layers by pitching pile sequence pile, every layer separates height difference with chock and is not greater than 10mm, up and down
Layer chock middle line will be in same vertical line, and allowable error is not greater than 20mm, while before construction, to two sides fore shaft with one piece
Stub with the long 2-3m of model is made through test, and being pulled through with 2-3 people is advisable, or dilatory, the maximum drawbar pull using hoist engine
≤ KN, if fore shaft can't pass or when pile body has bending, distortion, dog leg defect, using clod wash, heat strike (temperature is no more than 800 ~
1000 DEG C), soldering, riveting are mended, are cut off or the method for spreading is rebuild；
A4: cleaning riverbed excludes the ironware that Ha Noi is fallen into work progress early period, avoids tired to later period steel sheet-pile cofferdam bring
Difficulty, to improve the construction speed in later period.
In step s 2, according to the design size in cofferdam, four angle points in cofferdam are accurately measured, base is used as by piling
Standard, and flexible graticule is set in the outer side wall of four piles, so that staff can accurately construct according to graticule, it is difficult to reduce construction
Degree.
In step s3, steel pile casting is installed according to construction drawing, the verticality for guaranteeing steel pile casting, peace is needed during installation
After dress, welded formula bracket is welded leading truck by crossbeam or set square as support on the outer wall of steel pile casting
It is fixed on integral type bracket, leading truck uses prefabricated or on-site consolidation, and the radial width of the double-deck waling on leading truck is greater than
Steel sheet pile is inserted into the 8-10mm of width, so that steel sheet pile can be accurately inserted by staff.
Including construction procedure in detail below in S4:
B1: the brushing butter at the fore shaft of every piece of steel sheet pile reduces frictional force when inserting piling, to improve installation accuracy and construction
Efficiency；
B2: horizontal and vertical transport is carried out to steel sheet pile by telpher, steel sheet pile is transported to designated position, and be sequentially inserted into
In manned steel sheet pile lock；
B3: with 3-5 block steel sheet pile for one group, being divided to two flowing water sections by hanging device and hydraulic vibration hammer, inserting piling on earth, is inserted by group
Beat during, the steel sheet pile in first inserting piling upstream middle position finally closes up in downstream then to two sides inserting piling, if formed by
The rectangle cofferdam of dry steel sheet pile composition in work progress, guarantees the verticality of steel sheet pile by repeatedly surveying vertical mode；Cofferdam peace
After dress, communicating valve is installed on the side wall of cofferdam, can be used it is prefabricated, for guaranteeing the hydraulic pressure one inside and outside fluctuation time of tide cofferdam
It causes, a possibility that deformation occurs due to unbalance stress to reduce cofferdam；
B4: waterstop is bonded at the lock of adjacent steel sheet pile and improves construction for guaranteeing the impermeability of steel sheet-pile cofferdam
Safety.
In step s 5, in order to provide operating space to subsequent construction, leading truck, sequence and the installation of dismounting are removed
Sequence is opposite.
Including construction procedure in detail below in S6:
C1: installation radial type bracket comprising upper bracket and lower bracket, one end of the two passes through fixed plate respectively and steel sheet pile welds
Connect, the other end is connected with each other by bolt, be between upper bracket, lower bracket and fixed plate it is hinged, after removing bolt, upper bracket and
In the groove of the lower embeddable steel sheet pile of bracket；
C2: inner support is lifted to radial type bracket by hanging device using prefabricated；
C3: using steel pile casting as support counter-force distribution beam, jack and sunpender are installed respectively, form hangar system, open hinge
It connects formula bracket and is jacked by jack, transfer inner support to designed elevation；
C4: fixed inner support is hung by ten round steel, one end of round steel is connect with the pin shaft of inner support side, and the other end passes through
Steel plate is weldingly fixed in the groove of steel sheet pile；
C5: repeat the above steps C1, C2, C3, C4, three inner supports being sequentially completed above riverbed.
C6: by the gap length at place every between diver's subaqueous survey cofferdam and inner support, process super cushion block and by its
Installation guarantees that inner support is close to cofferdam, the stability after improving inner support installation to gap.
Including construction procedure in detail below in S7:
D1: closing communicating valve, makes to disconnect in cofferdam with extraneous；
D2: the water in cofferdam is extracted out by water pump；
D3: the mud of cofferdam bottom is sucked out to by suction dredge and is carried out excavation of foundation pit, until being excavated to the 4th inner support absolute altitude
And it is installed, it then proceedes to draw water and inhales mud, excavation pit to designing substrate；
D4: sandstone is backfilled inside to cofferdam and carries out levelling and tamps, for improving the flatness in riverbed.
Including construction procedure in detail below in S8:
E1: pumping pours bottom concrete；
E2: after bottom concrete intensity reaches standard, laying water-proof coiled material；
E3: pumping pours second layer bottom concrete on waterproof roll, carries out second consolidation and thickening, improves the stabilization of substrate
Property and bearing capacity.
Including construction procedure in detail below in S9:
F1: after the completion of substrate operation, the 4th inner support is removed, carries out cushion cap pier construction；
F2: backfilling rubble, and casting concrete is equal with cushion cap face between cushion cap and steel sheet pile, then removes tri- Dao Neizhi
Support；
F3: it is filled to second inner support in cofferdam once at 50cm, removes second inner support；
F4: opening communicating valve, during low tide, removes first of inner support and extracts steel sheet pile, be recycled to specified region, complete
At construction.
The present invention is by the way of first supporting and excavating afterwards, and cofferdam occurs deforming due to unbalance stress when reducing excavation
Possibility, meanwhile, the setting of three inner supports substantially increases the stability and stress-bearing capability in cofferdam, reduces excavation difficulty,
Since inner support is integrally transferred under water, it substantially reduces and excavates the period, improve construction efficiency, and the setting of communicating valve,
It ensure that water level is consistent inside and outside cofferdam, effective solution fluctuation time of tide cofferdam influences asking for construction due to internal and external pressure difference
Topic.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (10)
1. a kind of steel sheet pile cofferdam construction method, it is characterised in that: including following construction procedure:
S1: the preparation before construction；
S2: positioning measurement accurately measures four angle points in cofferdam according to the design size in cofferdam, is used as benchmark by piling,
And flexible graticule is set in the outer side wall of four piles；
S3: leading truck construction installs steel pile casting according to construction drawing, guarantees the verticality of steel pile casting in installation process, protect in steel
Leading truck is weldingly fixed on integral type bracket as support by crossbeam by welded formula bracket on the outer wall of cylinder, is oriented to
The radial width of the double-deck waling on frame is greater than the 8-10mm of steel sheet pile insertion width；
S4: steel sheet pile construction is divided to two flowing water sections to carry out inserting piling, special-shaped sheet pile to steel sheet pile by hanging device and hydraulic vibration hammer
Close up, the rectangle cofferdam that formation is made of several steel sheet piles, in work progress, steel sheet pile is guaranteed by the mode for repeatedly surveying vertical
Verticality installs communicating valve on the side wall of cofferdam, use it is prefabricated, guarantee fluctuation time of tide cofferdam inside and outside hydraulic pressure it is consistent；
S5: leading truck is removed, provides space for subsequent construction；
S6: inner support construction, the groove welding radial type bracket on the inside of steel sheet pile is as support platform, on branch assembling platform
Hoisting inner support, it is then respectively that three groups of inner supports are successively whole from top to bottom by hangar system to hang installation to design mark
Height during hanging, opens radial type bracket, is embedded in it in groove on the inside of steel sheet pile；
S7: it draws water and inhales mud, excavation pit；
S8: underwater back cover construction；
S9: cofferdam demolition.
2. a kind of steel sheet pile cofferdam construction method according to claim 1, it is characterised in that: include following apply in the S1
Work step is rapid:
A1: determining the structural parameters of steel sheet pile according to water level and geological conditions, according to the space of the size of cushion cap and required operation
It determines the overall dimensions of steel sheet-pile cofferdam, and reserves enough steel sheet piles；
A2: pre-manufactured steel sheet pile first passes through groove welding using similar shaped steel plate pile and carries out spreading, then again in the connection of two steel sheet piles
Place's reinforcement of weld plate is reinforced；
A3: Inspection carries out Deformation checking, surface inspection, classification and number to steel sheet pile, after passed examination, is put down by two groups
Vehicle is transported to harbour, at most allows to stack four layers by pitching pile sequence pile, every layer separates height difference with chock and is not greater than 10mm, up and down
Layer chock middle line will be in same vertical line, and allowable error is not greater than 20mm；
A4: cleaning riverbed excludes the ironware that Ha Noi is fallen into work progress early period, avoids tired to later period steel sheet-pile cofferdam bring
It is difficult.
3. a kind of steel sheet pile cofferdam construction method according to claim 2, it is characterised in that: further include to two in the A3
Side chain mouth is made with one piece of stub with the long 2-3m of model through test, and being pulled through with 2-3 people is advisable, or is dragged using hoist engine
It draws, maximum drawbar pull≤KN, if fore shaft can't pass or when pile body has bending, distortion, dog leg defect, using clod wash, heat strikes (temperature
No more than 800 ~ 1000 DEG C), soldering, riveting are mended, are cut off or the method for spreading is rebuild.
4. a kind of steel sheet pile cofferdam construction method according to claim 1, it is characterised in that: include following apply in the S4
Work step is rapid:
B1: the brushing butter at the fore shaft of every piece of steel sheet pile reduces frictional force when inserting piling；
B2: horizontal and vertical transport is carried out to steel sheet pile by telpher, steel sheet pile is transported to designated position, and be sequentially inserted into
In manned steel sheet pile lock；
B3: with 3-5 block steel sheet pile be one group, by group inserting piling on earth, during inserting piling, the steel plate in first inserting piling upstream middle position
Stake, then to two sides inserting piling, finally closes up in downstream.
5. a kind of steel sheet pile cofferdam construction method according to claim 4, it is characterised in that: in the S4 further include:
B4: it is bonded waterstop at the lock of adjacent steel sheet pile, guarantees the impermeability of steel sheet-pile cofferdam.
6. a kind of steel sheet pile cofferdam construction method according to claim 1, it is characterised in that: include following apply in the S6
Work step is rapid:
C1: radial type bracket includes upper bracket and lower bracket, and wherein one end of the two passes through fixed plate respectively and steel sheet pile welds,
The other end is connected by bolt, upper bracket and it is lower be between bracket and fixed plate it is hinged, after removing bolt, upper bracket and lower bracket
It is embedded in the groove of steel sheet pile；
C2: inner support is lifted to radial type bracket by hanging device using prefabricated；
C3: using steel pile casting as support counter-force distribution beam, jack and sunpender are installed respectively, form hangar system, open hinge
It connects formula bracket and is jacked by jack, transfer inner support to designed elevation；
C4: fixed inner support is hung by ten round steel, one end of round steel is connect with the pin shaft of inner support side, and the other end passes through
Steel plate is weldingly fixed in the groove of steel sheet pile；
C5: repeat the above steps C1, C2, C3, C4, three inner supports being sequentially completed above riverbed.
7. a kind of steel sheet pile cofferdam construction method according to claim 6, it is characterised in that: in the S6 further include:
C6: it by the gap length at place every between diver's subaqueous survey cofferdam and inner support, processes super cushion block and is installed
To gap, guarantee that inner support is close to cofferdam.
8. a kind of steel sheet pile cofferdam construction method according to claim 1, it is characterised in that: include following apply in the S7
Work step is rapid:
D1: communicating valve is closed；
D2: the water in cofferdam is extracted out by water pump；
D3: the mud of cofferdam bottom is sucked out to by suction dredge and is carried out excavation of foundation pit, until being excavated to the 4th inner support absolute altitude
And it is installed, it then proceedes to draw water and inhales mud, excavation pit to designing substrate；
D4: sandstone is backfilled inside to cofferdam and carries out levelling and tamps.
9. a kind of steel sheet pile cofferdam construction method according to claim 1, it is characterised in that: include following apply in the S8
Work step is rapid:
E1: pumping pours bottom concrete；
E2: after bottom concrete intensity reaches standard, laying water-proof coiled material；
E3: pumping pours second layer bottom concrete on waterproof roll.
10. a kind of steel sheet pile cofferdam construction method according to claim 1, it is characterised in that: include following in the S9
Construction procedure:
F1: removing the 4th inner support, carries out cushion cap pier construction；
F2: backfilling rubble between cushion cap and steel sheet pile, and casting concrete is equal with cushion cap face, removes third road inner support；
F3: it is filled to second inner support in cofferdam once at 50cm, removes second inner support；
F4: opening communicating valve, during low tide, removes first of inner support and extracts steel sheet pile.
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| CN113202117A (en) * | 2021-05-07 | 2021-08-03 | 中交一公局集团有限公司 | Larsen steel sheet pile construction process |
| CN113818460A (en) * | 2021-10-09 | 2021-12-21 | 中铁大桥局第七工程有限公司 | Cofferdam construction method based on high-standard environmental protection requirement |
| CN113818460B (en) * | 2021-10-09 | 2023-02-28 | 中铁大桥局第七工程有限公司 | Cofferdam construction method based on high-standard environmental protection requirement |
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Application publication date: 20191115 |