CN110499772A - A kind of rock matter riverbed double-layer plate pile cofferdam construction method - Google Patents
A kind of rock matter riverbed double-layer plate pile cofferdam construction method Download PDFInfo
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- CN110499772A CN110499772A CN201910809957.3A CN201910809957A CN110499772A CN 110499772 A CN110499772 A CN 110499772A CN 201910809957 A CN201910809957 A CN 201910809957A CN 110499772 A CN110499772 A CN 110499772A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/06—Fitted piles or other elements specially adapted for closing gaps between two sheet piles or between two walls of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/16—Auxiliary devices rigidly or detachably arranged on sheet piles for facilitating assembly
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a kind of rock matter riverbed double-layer plate pile cofferdam construction methods, Step 1: outrigger, upper layer purlin are installed；Step 2: setting fixing steel plate stake；Step 3: other steel sheet piles are set；Step 4: steel sheet pile closes up；Step 5: two-layered steel plates stake connection and the backfill in gap；Step 6: inner support is installed；Step 7: localized seepage is handled；Step 8: removing cofferdam；Step 9: cleaning river；The present invention relates to Construction Technique of Steel Sheet Cofferdam fields.The rock matter riverbed double-layer plate pile cofferdam construction method, two-layered steel plates stake and inner support form an entirety, enhance the overall stability in cofferdam, securely and reliably；Clay is filled in two-layered steel plates stake, effective solution seeps water this problem, water-stagnating effect is significant, it is rock or the very thin underwater support table cofferdam construction of clay coating suitable for riverbed, it constructs primarily directed to underwater support table and pier stud, steel sheet pile is common Larsen steel sheet pile, and marketing material is in liberal supply.
Description
Technical field
The present invention relates to Construction Technique of Steel Sheet Cofferdam field, a kind of specially rock matter riverbed double-layer plate pile cofferdam is constructed
Method.
Background technique
Steel sheet-pile cofferdam is a kind of most common sheet-pile cofferdam, and steel sheet pile is a kind of fashioned iron with fore shaft, and section has
Straight panel shape, flute profile and Z-shaped etc., have full range of sizes and interlocking form, common are Ademilson formula of drawing, Lackawanna type etc., build
The steel sheet pile product of Ji Shuinizhipinchang production is widely used in subway station, tunnel, bridge construction cofferdam, revetment, municipal works, civil engineering work
The excavating of the earth-retainings such as deep basal pit, groove, pipeline, the basement of journey, water blocking, plays a significant role in engineering.
When traditional steel sheet-pile cofferdam is using steel sheet pile direct inserting piling, shallower severely-weathered layer, middle weathered layer can be penetrated
Rock strength is larger, and soil layer has higher stickiness, is difficult to squeeze into, and Riverbed is very thin, predominantly basement rock, pile foundation in water
Using the form of construction work in cofferdam, traditional steel sheet pile cofferdam construction mode is difficult to meet construction requirement, the rock matter riverbed the case where
There is down unstable, the risk of water-stagnating effect difference, and cannot be guaranteed that steel sheet pile has reached maximum embedded depth and guarantees to enclose
Welding between purlin and inner support is met the requirements.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the present invention provides a kind of rock matter riverbed double-layer plate pile cofferdam construction method, solutions
The steel sheet pile cofferdam construction mode for having determined traditional is difficult to meet construction requirement, in the case where rock matter riverbed have it is unstable, only
The risk of water effect difference, and cannot be guaranteed that steel sheet pile has reached maximum embedded depth, and guarantee between purlin and inner support
Welding the problem of meeting the requirements.
(2) technical solution
In order to achieve the above object, the present invention is achieved by the following technical programs: a kind of rock matter riverbed clad steel sheet pile
Cofferdam construction method, specifically includes the following steps:
Step 1: outrigger, upper layer purlin are installed: outrigger is made by I-steel, uses the outlet steel pipe of former drilling platform
Fixed purlin, long side reserve 30cm or more distance close to steel-pipe pile along river direction purlin to stake welding outrigger in turn, and upstream and downstream is along bridge
Direction, it is ensured that the safe distance of purlin and foundation pit in 3-4m, due to away from steel-pipe pile farther out, admittedly using the fixed purlin of guide pile, first
By a steel sheet pile inserting piling in the inside of purlin position, mark the position of purlin lower edge, then weld nose girder, nose girder height according to
Water surface absolute altitude determines, leaves 40-50cm of the water surface or so, convenient for welding operation, after nose girder is installed, upper layer purlin
It is shelved on above nose girder, leaves steel-pipe pile 30cm distance, purlin is fixed with nose girder spot welding, in place for convenience of lower layer's purlin, can be with
Lower layer's purlin is hung in nose girder in advance in the following, being fixed temporarily, but steel sheet pile inserting piling cannot be influenced；
Step 2: setting fixing steel plate stake: selecting the steel sheet pile of appropriate length when construction according to water level, select from bank side water
Shallowly, the small place of flow velocity starts, and the positioning of first skirt piles and two-way verticality are control steel sheet-pile cofferdam position and later period steel
The key of sheet pile construction, when construction, must control as strict as possible, and the cargo ship of 200t is selected to transport piling machine to desired position, with positioning
Stake fixes cargo ship, keeps hull to stablize, the orientation for setting first skirt piles is accurately surveyed with total station, commands cargo ship to move with this
Position, after positioning, the center of gravity of steel sheet pile must be consistent with layout point, and piling machinery selects 470 class digging machine to insert with 60t vibration hammer
It beats, steel sheet pile is lower in vertical state to be completed, and lifting steel sheet pile is lower in vertical state to complete pitching pile, it is contemplated that the influence of water flow, the
One pile needs indwelling certain pre- allowance when plugging, after pitching pile is stablized, the position of accurate repetition measurement stake and two-way verticality are not met
It is required that when need pitching pile again, until set pile body until starting rebound, it is ensured that steel sheet pile has reached maximum and enters until qualification
Native depth, field technician record steel sheet pile driving depth at any time；
Step 3: other steel sheet piles are set: along the nose girder fixed successively other steel sheet piles of inserting piling, beating by root cutting to nothing
Until drilling depth, rebound, until closing up, the steel sheet pile at corner, chance barrier displacement is used according to linking angle in stock back court
Electric welding machine welding production socket to meet actual requirement, steel sheet pile sling after along previous piece of fore shaft underthrust, this engineering method uses
60 with hydraulic clip pile device extricate oneself from a predicament and brace oneself up to action hammer, can couple with piling bar as rigidity, can overcome the frictional resistance to stake, improve steel sheet pile
Waterproof performance and serviceability rate, when steel sheet pile is set, using total station tracking measurement, the deviation situation of steel sheet pile check at any time, when
It is corrected in time with jack when steel sheet pile glances off, with sharp correction in time, when deflection is excessive to be adjusted with the method for pultrusion,
It should pull up and insert again, meet big block stone or other ambiguous barriers sometimes during stake, cause steel sheet pile driving depth inadequate, adopt
With corner pile or arc-shaped pile cut-through object, reinforcement is taken to support purlin, to prevent from occurring during setting steel sheet pile
The phenomenon that " band stake ", the lubricators such as butter can be filled in front of beating in the fore shaft of steel sheet pile, to reduce rubbing for steel sheet pile fore shaft
Power is wiped, " band stake " is avoided；Guarantee the verticality of steel sheet pile, it can also be to avoid " band stake " phenomenon, during inserting piling, under steel sheet pile
To hold upward, gap is larger between steel sheet pile fore shaft, and upper end is always tilted to the direction far from first steel sheet pile, therefore,
Every dozen of 5-8 steel sheet piles will use plumb bob messenger wire, by the control of gradient of steel sheet pile within 5 ‰, more than the gradient of restriction
Should rectify a deviation (disposable correction cannot be too many, in order to avoid fore shaft blocks, under the influence of a piece of steel sheet pile inserting piling), it is ensured that two-layered steel plates stake
Between clear distance be 1 meter；
Step 4: steel sheet pile closes up: steel sheet-pile cofferdam when closing up, two sides fore shaft it is difficult to ensure that point-blank, this
When the measure taken are as follows: when steel sheet pile closes up and there remains several groups of also non-inserting pilings, consider to close up situation in advance, can be by cofferdam short side
Steel sheet pile be entirely insertable, then gradually set again, the stake of steel metal plate is finally closed up in downstream, residue width when plugging together mouthful steel metal plate stake
Inserting piling seaming requirements can not be met just, the certain distance before closing up is staggered inserting piling, until after closing up place, piece steel of more inserting pilings
Sheet pile, then the steel sheet pile of more inserting pilings is welded with the steel sheet pile for closing up place's other direction；
Step 5: two-layered steel plates stake connection and the backfill in gap: inside and outside pull rod, bolt fastening shape are used between steel sheet pile
It is integral, increase the rigidity of two sides steel sheet pile, after outer purlin is installed, pull rod is mounted between two layers of purlin, blending bolt
It fastens, uses clay backfilling between two-layered steel plates stake after pull rod fastening, placement in layers compacting, clay is transported to code by transport vehicle on the bank
Head, then clay is transported to cargo ship by grab claw, anchoring, work beside the working ship for being loaded with digging machine by cofferdam are transported to by cargo ship
Digging machine on journey ship takes soil from cargo ship, is backfilled between steel sheet pile, when digging machine away from clay distance farther out when, need cargo ship to open
It moves to digging machine and takes in native range；
Step 6: inner support is installed: vertically arranged 2 layers of inner support inside cofferdam, diagonal brace sets upstream face according to the actual situation
Be arranged 4, back side setting 3 carries out inner support installation in top after the completion of two-layered steel plates stake gap filling, support and purlin it
Between using welding, steel pipe groove is processed when encountering oblique angle in advance, cut surface is closely connected seamless with purlin, first layer inner support weld
After connecing, with pumping for water pump to the bottom of lower part purlin, upper and lower purlin center spacing is not more than 4m, to guarantee construction safety,
Second layer purlin is set before anhydrous excavation, and the installation of purlin and reasonable mechanical are the key that the success or not of this engineering method, are constructed
It is ensured that bolt fastening, weld seam meet code requirement in journey, diagonal brace, middle support and the connection of purlin use stiffener and ribbed stiffener
The mode of welding, the first setting-out in purlin, marks the center of supporting steel pipe, welds veneer stiffener, then by supporting steel pipe
It is welded on veneer stiffener, the surrounding of stiffener and supporting steel pipe welding surface is uniformly welded with 4 pieces of ribbed stiffeners, enhances the anti-of welding surface
Cutting property；
Step 7: localized seepage is handled: on the outside of upstream face steel sheet pile plus the steel sheet pile that blocks water of row's arc is made a call to, in reduction
Impact of the swimming stream to cofferdam, according to actual needs, in geological conditions bad upstream face and back side, every side suitably increases by one
Road diagonal brace, to increase the stability in cofferdam, between each layer of diagonal brace plus one to twice I-steel lateral, further strengthens diagonal brace
Stabilization；
Step 8: removing cofferdam: after the completion of the construction of first segment pier stud, dismountable cofferdam inner support pulls out steel sheet pile, first will
Second layer purlin and bracing demolition simultaneously hang out cofferdam, then 50cm under first layer purlin is filled into cofferdam, and safety removes the
One layer of purlin and backing material remove steel sheet pile first by downstream direction, and symmetrical construction to updrift side pulls out hammer using shake and matches
It closes crane and carries out dismounting operation；
Step 9: cleaning river: after steel sheet pile is removed, removing the clay between steel sheet pile, restore river original appearance, adopt
The clay left between steel sheet pile is cleared up with digging machine and dredger, technical staff scene is arranged to track in work progress,
Supervision checks, records the earth volume excavated out in detail, since riverbed absolute altitude can not clearly detect in scale removal process, therefore need
Prepare canoe and feeler lever is a set of, after the completion of clearing up within a certain area, testing staff detects cleaning depth with feeler lever immediately, avoids
There is the region that leakage is dug or excavating depth is inadequate.
Preferably, the 20a I-beam that I-beam is long 0.7m in the step 1.
Preferably, upper and lower level purlin is all made of the section steel manufacture of Two bors d's oeuveres H400 × 200 in the step 1.
Preferably, that has beaten on the face of 4, cofferdam in the step 3 will be with outrigger in vertical direction per a piece of steel sheet pile
It is upper vertical.
Preferably, lateral inner support uses φ 600mm × 10mm steel pipe in the step 6, diagonal brace using φ 400mm ×
8mm steel pipe.
Preferably, pull rod is φ 24mm pull rod in the step 5.
Preferably, it is leveled up when occurring the gap of 1cm or more between purlin and steel sheet pile in the step 6 with steel plate.
Preferably, in the step 6 surrounding of stiffener and supporting steel pipe welding surface be welded with ribbed stiffener quantity can basis
Actual conditions freely adjust.
(3) beneficial effect
The present invention provides a kind of rock matter riverbed double-layer plate pile cofferdam construction methods.Compared with prior art, have with
It is lower the utility model has the advantages that
(1), the rock matter riverbed double-layer plate pile cofferdam construction method, by inside and outside between steel sheet pile with pull rod,
Bolt fastening forms entirety, increases the rigidity of two sides steel sheet pile, after outer purlin is installed, by pull rod be mounted on two layers of purlin it
Between, blending bolt fastens, and uses clay backfilling between two-layered steel plates stake after pull rod fastening, placement in layers compacting, transport vehicle will on the bank
Clay is transported to harbour, then clay is transported to cargo ship by grab claw, and the working ship that digging machine is loaded with by cofferdam is transported to by cargo ship
Side anchoring, the digging machine on working ship take soil from cargo ship, are backfilled between steel sheet pile, when digging machine away from clay distance farther out
When, it needs cargo ship to start to digging machine and takes in native range, two-layered steel plates stake and inner support form an entirety, enhance the whole of cofferdam
Body stability, securely and reliably；Fill clay in two-layered steel plates stake, effective solution this problem that seeps water, water-stagnating effect is significant,
It is rock or the very thin underwater support table cofferdam construction of clay coating suitable for riverbed, is applied primarily directed to underwater support table and pier stud
Work.
(2), the rock matter riverbed double-layer plate pile cofferdam construction method, by 2 layers of inner support vertically arranged inside cofferdam,
Diagonal brace sets upstream face setting 4 according to the actual situation, and back side setting 3, two-layered steel plates stake gap filling carries out after the completion
Inner support installation in portion's processes steel pipe groove, cut surface and purlin using welding between support and purlin in advance when encountering oblique angle
It is closely connected seamless, after first layer inner support is welded, with pumping for water pump to the bottom of lower part purlin, upper and lower purlin center spacing
No more than 4m, to guarantee construction safety, second layer purlin is set before anhydrous excavation, and the installation of purlin and reasonable mechanical are this works
The key of method success or not, it is ensured that bolt fastening, weld seam meet code requirement, diagonal brace, middle support and purlin in work progress
Connection using stiffener and ribbed stiffener welding by the way of, first the setting-out in purlin, mark the center of supporting steel pipe, welding
Veneer stiffener, then supporting steel pipe is welded on veneer stiffener, the surrounding of stiffener and supporting steel pipe welding surface is uniformly welded with 4
Block ribbed stiffener enhances the shear resistance of welding surface, and using double-layer plate pile cofferdam construction, steel sheet pile used is common Larsen
Steel sheet pile, marketing material are in liberal supply；Have more piling machines while constructing, it is practical；Subaqueous work is convenient and efficient, has
Apparent duration advantage；It, can be with save the cost, remarkable in economical benefits compared to the cofferdam mode of rock matter riverbed other forms.
(3), the rock matter riverbed double-layer plate pile cofferdam construction method uses original by the way that outrigger is being made by I-steel
The steel pipe pile welding outrigger of drilling platform and then fixed purlin, long side along river direction purlin close to steel-pipe pile reserve 30cm with
Upper distance, upstream and downstream is along the bridge, it is ensured that the safe distance of purlin and foundation pit in 3-4m, due to away from steel-pipe pile farther out, Gu use
Guide pile fixes purlin, and first a steel sheet pile inserting piling is marked the position of purlin lower edge, then welded in the inside of purlin position
Nose girder, nose girder height is determined according to water surface absolute altitude, leaves 40-50cm of the water surface or so, convenient for welding operation, nose girder installation
After the completion, upper layer purlin is shelved on above nose girder, leaves steel-pipe pile 30cm distance, purlin is fixed with nose girder spot welding, for convenience
Lower layer's purlin is in place, can in advance hang lower layer's purlin in nose girder in the following, be fixed temporarily, but cannot influence steel sheet pile inserting piling,
The scope of application of steel sheet-pile cofferdam has been expanded, there is huge social benefit, it completely can be in rock matter riverbed or close
It is promoted the use of in rivers bridge, there is immeasurable contribution to the construction of bridge from now on.
Detailed description of the invention
Fig. 1 is purlin Typical Planar figure on double-layer plate pile cofferdam of the present invention；
Fig. 2 is purlin Typical Planar figure under double-layer plate pile cofferdam of the present invention；
Fig. 3 is double-layer plate pile cofferdam typical section figure of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-3, the embodiment of the present invention provides a kind of technical solution: a kind of rock matter riverbed double-layer plate pile cofferdam is applied
Work method, Step 1: outrigger, upper layer purlin are installed: outrigger is made by I-steel, I-beam is long 0.7m's in step 1
20a I-beam, it is close along river direction purlin using the steel pipe pile welding outrigger and then fixed purlin, long side of former drilling platform
Steel-pipe pile reserves 30cm or more distance, and upstream and downstream is along the bridge, it is ensured that the safe distance of purlin and foundation pit in 3-4m, due to away from
Steel-pipe pile farther out, admittedly fixing purlin using guide pile, first marks a steel sheet pile inserting piling under purlin in the inside of purlin position
Then nose girder is welded in the position of edge, upper and lower level purlin is all made of the section steel manufacture of Two bors d's oeuveres H400 × 200, nose girder height in step 1
It is determined according to water surface absolute altitude, leaves 40-50cm of the water surface or so, convenient for welding operation, after nose girder is installed, upper layer
Purlin is shelved on above nose girder, leaves steel-pipe pile 30cm distance, and purlin is fixed with nose girder spot welding, in place for convenience of lower layer's purlin,
Lower layer's purlin can be hung in nose girder in advance in the following, being fixed temporarily, but steel sheet pile inserting piling cannot be influenced；
Step 2: setting fixing steel plate stake: selecting the steel sheet pile of appropriate length when construction according to water level, select from bank side water
Shallowly, the small place of flow velocity starts, and the positioning of first skirt piles and two-way verticality are control steel sheet-pile cofferdam position and later period steel
The key of sheet pile construction, when construction, must control as strict as possible, and the cargo ship of 200t is selected to transport piling machine to desired position, with positioning
Stake fixes cargo ship, keeps hull to stablize, the orientation for setting first skirt piles is accurately surveyed with total station, commands cargo ship to move with this
Position, after positioning, the center of gravity of steel sheet pile must be consistent with layout point, and piling machinery selects 470 class digging machine to insert with 60t vibration hammer
It beats, steel sheet pile is lower in vertical state to be completed, and lifting steel sheet pile is lower in vertical state to complete pitching pile, it is contemplated that the influence of water flow, the
One pile needs indwelling certain pre- allowance when plugging, after pitching pile is stablized, the position of accurate repetition measurement stake and two-way verticality are not met
It is required that when need pitching pile again, until set pile body until starting rebound, it is ensured that steel sheet pile has reached maximum and enters until qualification
Native depth, field technician record steel sheet pile driving depth at any time；
Step 3: other steel sheet piles are set: along the nose girder fixed successively other steel sheet piles of inserting piling, beating by root cutting to nothing
Until drilling depth, rebound, until closing up, the steel sheet pile at corner, chance barrier displacement is used according to linking angle in stock back court
Electric welding machine welding production socket to meet actual requirement, steel sheet pile sling after along previous piece of fore shaft underthrust, this engineering method uses
60 with hydraulic clip pile device extricate oneself from a predicament and brace oneself up to action hammer, can couple with piling bar as rigidity, can overcome the frictional resistance to stake, improve steel sheet pile
Waterproof performance and serviceability rate, when steel sheet pile is set, using total station tracking measurement, the deviation situation of steel sheet pile check at any time, when
It is corrected in time with jack when steel sheet pile glances off, with sharp correction in time, when deflection is excessive to be adjusted with the method for pultrusion,
It should pull up and insert again, meet big block stone or other ambiguous barriers sometimes during stake, cause steel sheet pile driving depth inadequate, adopt
With corner pile or arc-shaped pile cut-through object, reinforcement is taken to support purlin, to prevent from occurring during setting steel sheet pile
The phenomenon that " band stake ", the lubricators such as butter can be filled in front of beating in the fore shaft of steel sheet pile, to reduce rubbing for steel sheet pile fore shaft
Power is wiped, " band stake " is avoided；Guarantee the verticality of steel sheet pile, it can also be to avoid " band stake " phenomenon, during inserting piling, under steel sheet pile
To hold upward, gap is larger between steel sheet pile fore shaft, and upper end is always tilted to the direction far from first steel sheet pile, therefore,
Every dozen of 5-8 steel sheet piles will use plumb bob messenger wire, by the control of gradient of steel sheet pile within 5 ‰, more than the gradient of restriction
Should rectify a deviation (disposable correction cannot be too many, in order to avoid fore shaft blocks, under the influence of a piece of steel sheet pile inserting piling), it is ensured that two-layered steel plates stake
Between clear distance be 1 meter, beaten on the face of 4, cofferdam in step 3 often a piece of steel sheet pile will be with outrigger in the vertical direction
Vertically, the scope of application of steel sheet-pile cofferdam has been expanded, there is huge social benefit, can be connect completely in rock matter riverbed or therewith
It is promoted the use of in close rivers bridge, there is immeasurable contribution to the construction of bridge from now on；
Step 4: steel sheet pile closes up: steel sheet-pile cofferdam when closing up, two sides fore shaft it is difficult to ensure that point-blank, this
When the measure taken are as follows: when steel sheet pile closes up and there remains several groups of also non-inserting pilings, consider to close up situation in advance, can be by cofferdam short side
Steel sheet pile be entirely insertable, then gradually set again, the stake of steel metal plate is finally closed up in downstream, residue width when plugging together mouthful steel metal plate stake
Inserting piling seaming requirements can not be met just, the certain distance before closing up is staggered inserting piling, until after closing up place, piece steel of more inserting pilings
Sheet pile, then the steel sheet pile of more inserting pilings is welded with the steel sheet pile for closing up place's other direction；
Step 5: two-layered steel plates stake connection and the backfill in gap: inside and outside pull rod, bolt fastening shape are used between steel sheet pile
Integral, pull rod is φ 24mm pull rod in step 5, increases the rigidity of two sides steel sheet pile, and after installing outer purlin, pull rod is pacified
Between two layers of purlin, blending bolt is fastened, and uses clay backfilling between two-layered steel plates stake after pull rod fastening, and placement in layers is rammed
Real, clay is transported to harbour by transport vehicle on the bank, then clay is transported to cargo ship by grab claw, is transported to by cofferdam and is carried by cargo ship
Have anchoring beside the working ship of digging machine, the digging machine on working ship takes soil from cargo ship, is backfilled between steel sheet pile, when digging machine away from
Clay distance farther out when, need cargo ship to start to digging machine and take in native range, two-layered steel plates stake and inner support form an entirety, increase
The strong overall stability in cofferdam, securely and reliably；Fill clay in two-layered steel plates stake, effective solution this problem that seeps water,
Water-stagnating effect is significant, is rock or the very thin underwater support table cofferdam construction of clay coating suitable for riverbed, primarily directed to water
Middle cushion cap and pier stud construction；
Step 6: inner support is installed: vertically arranged 2 layers of inner support inside cofferdam, diagonal brace sets upstream face according to the actual situation
It is arranged 4, back side is arranged 3, and lateral inner support uses φ 600mm × 10mm steel pipe in step 6, and diagonal brace uses φ 400mm
× 8mm steel pipe, two-layered steel plates stake gap filling carry out the installation of top inner support after the completion, welding are used between support and purlin,
Steel pipe groove is processed when encountering oblique angle in advance, cut surface is closely connected seamless with purlin, after first layer inner support is welded, uses
Pumping for water pump to the bottom of lower part purlin, upper and lower purlin center spacing is not more than 4m, to guarantee construction safety, before anhydrous excavation
Second layer purlin is set, and the installation of purlin and reasonable mechanical are the key that the success or not of this engineering method, it is ensured that spiral shell in work progress
Bolt fastening, weld seam meet code requirement, and diagonal brace, middle support connect by the way of stiffener and ribbed stiffener welding with purlin,
The first setting-out in purlin marks the center of supporting steel pipe, welds veneer stiffener, then supporting steel pipe is welded in veneer and is put more energy into
On plate, the surrounding of stiffener and supporting steel pipe welding surface is uniformly welded with 4 pieces of ribbed stiffeners, enhances the shear resistance of welding surface, step 6
The surrounding of middle stiffener and supporting steel pipe welding surface is welded with ribbed stiffener quantity and can freely adjust according to the actual situation；
Step 7: localized seepage is handled: on the outside of upstream face steel sheet pile plus the steel sheet pile that blocks water of row's arc is made a call to, in reduction
Impact of the swimming stream to cofferdam, according to actual needs, in geological conditions bad upstream face and back side, every side suitably increases by one
Road diagonal brace, to increase the stability in cofferdam, between each layer of diagonal brace plus one to twice I-steel lateral, further strengthens diagonal brace
Stabilization, using double-layer plate pile cofferdam construction, steel sheet pile used is common Larsen steel sheet pile, and marketing material supply is filled
Foot；Have more piling machines while constructing, it is practical；Subaqueous work is convenient and efficient, has apparent duration advantage；Compared to rock
The cofferdam mode of matter riverbed other forms, can be with save the cost, remarkable in economical benefits；
Step 8: removing cofferdam: after the completion of the construction of first segment pier stud, dismountable cofferdam inner support pulls out steel sheet pile, first will
Second layer purlin and bracing demolition simultaneously hang out cofferdam, then 50cm under first layer purlin is filled into cofferdam, and safety removes the
One layer of purlin and backing material remove steel sheet pile first by downstream direction, and symmetrical construction to updrift side pulls out hammer using shake and matches
It closes crane and carries out dismounting operation；
Step 9: cleaning river: after steel sheet pile is removed, removing the clay between steel sheet pile, restore river original appearance, adopt
The clay left between steel sheet pile is cleared up with digging machine and dredger, technical staff scene is arranged to track in work progress,
Supervision checks, records the earth volume excavated out in detail, since riverbed absolute altitude can not clearly detect in scale removal process, therefore need
Prepare canoe and feeler lever is a set of, after the completion of clearing up within a certain area, testing staff detects cleaning depth with feeler lever immediately, avoids
There is the region that leakage is dug or excavating depth is inadequate.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. a kind of rock matter riverbed double-layer plate pile cofferdam construction method, it is characterised in that: specifically includes the following steps:
Step 1: outrigger, upper layer purlin are installed: outrigger is made by I-steel, is welded using the steel pipe pile of former drilling platform
Connect outrigger and then fixed purlin, long side reserves 30cm or more distance close to steel-pipe pile along river direction purlin, upstream and downstream along the bridge,
Ensure the safe distance of purlin and foundation pit in 3-4m, due to away from steel-pipe pile farther out, admittedly using the fixed purlin of guide pile, first by one
Root steel sheet pile inserting piling marks the position of purlin lower edge in the inside of purlin position, then welds nose girder, nose girder height is according to the water surface
Absolute altitude determines, leaves 40-50cm of the water surface or so, and convenient for welding operation, after nose girder is installed, upper layer purlin is shelved
On nose girder, steel-pipe pile 30cm distance is left, purlin is fixed with nose girder spot welding, and it is in place for convenience of lower layer's purlin, it can shift to an earlier date
Lower layer's purlin is hung in nose girder in the following, being fixed temporarily, but steel sheet pile inserting piling cannot be influenced；
Step 2: setting fixing steel plate stake: select the steel sheet pile of appropriate length when construction according to water level, selection is shallow from bank side water,
The small place of flow velocity starts, and the positioning of first skirt piles and two-way verticality are control steel sheet-pile cofferdam position and later period steel sheet pile
The key of construction, when construction, must control as strict as possible, and the cargo ship of 200t is selected to transport piling machine to desired position, solid with guide pile
Cargo ship is set, keeps hull to stablize, the orientation for setting first skirt piles is accurately surveyed with total station, commands cargo ship to shift with this,
After positioning, the center of gravity of steel sheet pile must be consistent with layout point, and piling machinery selects 470 class digging machine to match 60t vibration hammer inserting piling,
Steel sheet pile is lower in vertical state to be completed, and lifting steel sheet pile is lower in vertical state to complete pitching pile, it is contemplated that the influence of water flow, first
Stake needs indwelling certain pre- allowance when plugging, after pitching pile is stablized, the position of accurate repetition measurement stake and two-way verticality are undesirable
When need pitching pile again, until set pile body until starting rebound until qualification, it is ensured that steel sheet pile has reached maximum and buries depth
Degree, field technician record steel sheet pile driving depth at any time；
Step 3: other steel sheet piles are set: along the nose girder fixed successively other steel sheet piles of inserting piling, by root cutting beat to without into
Until ruler, rebound, until closing up, the steel sheet pile at corner, chance barrier displacement is according to linking angle, in stock back court electricity consumption
Welder makes socket to meet actual requirement, steel sheet pile sling after along previous piece of fore shaft underthrust, this engineering method uses band
Have hydraulic clip pile device 60 are extricated oneself from a predicament and brace oneself up to action hammer, can be coupled with piling bar as rigidity, can be overcome the frictional resistance to stake, and the anti-of steel sheet pile is improved
Aqueous energy and serviceability rate, when steel sheet pile is set, using total station tracking measurement, the deviation situation of steel sheet pile, works as steel check at any time
It is corrected with jack when sheet pile glances off, is answered with sharp correction in time when deflection is excessive to be adjusted with the method for pultrusion in time
It pulls up and inserts again, meet big block stone or other ambiguous barriers sometimes during stake, cause steel sheet pile driving depth inadequate, use
Corner pile or arc-shaped pile cut-through object take reinforcement to support purlin, to prevent from occurring " band during setting steel sheet pile
The phenomenon that stake ", the lubricators such as butter can be filled in front of beating in the fore shaft of steel sheet pile, to reduce the friction of steel sheet pile fore shaft
Power avoids " band stake "；Guarantee the verticality of steel sheet pile, it can also be to avoid " band stake " phenomenon, during inserting piling, steel sheet pile lower end
Upward, gap is larger between steel sheet pile fore shaft, and upper end is always tilted to the direction far from first steel sheet pile, therefore, often
Plumb bob messenger wire will be used by making a call to 5-8 steel sheet piles, and by the control of gradient of steel sheet pile within 5 ‰, the gradient more than restriction is answered
Correction (disposable correction cannot be too many, in order to avoid fore shaft blocks, under the influence of a piece of steel sheet pile inserting piling), it is ensured that two-layered steel plates stake it
Between clear distance be 1 meter；
Step 4: steel sheet pile closes up: for steel sheet-pile cofferdam when closing up, two sides fore shaft it is difficult to ensure that point-blank, adopt at this time
The measure taken are as follows: when steel sheet pile closes up and there remains several groups of also non-inserting pilings, consider to close up situation in advance, it can be by the steel of cofferdam short side
Sheet pile is entirely insertable, and is then gradually set again, and the stake of steel metal plate is finally closed up in downstream, and residue width can not when plugging together mouthful steel metal plate stake
It can meet inserting piling seaming requirements just, the certain distance before closing up is staggered inserting piling, until after closing up place, piece steel plate of more inserting pilings
Stake, then the steel sheet pile of more inserting pilings is welded with the steel sheet pile for closing up place's other direction；
Step 5: two-layered steel plates stake connection and the backfill in gap: inside and outside formed with pull rod, bolt fastening between steel sheet pile it is whole
Body increases the rigidity of two sides steel sheet pile, and after installing outer purlin, pull rod is mounted between two layers of purlin, blending bolt fastening,
Clay backfilling is used between two-layered steel plates stake after pull rod fastening, placement in layers compacting, clay is transported to harbour by transport vehicle on the bank, then by
Clay is transported to cargo ship by grab claw, is transported to beside the working ship for being loaded with digging machine by cofferdam and is anchored by cargo ship, on working ship
Digging machine soil is taken from cargo ship, be backfilled between steel sheet pile, when digging machine away from clay distance farther out when, need cargo ship to start to digging
Machine takes in native range；
Step 6: inner support is installed: vertically arranged 2 layers of inner support inside cofferdam, diagonal brace sets upstream face setting 4 according to the actual situation
Road, back side setting 3, two-layered steel plates stake gap filling carry out the installation of top inner support after the completion, adopt between support and purlin
With welding, steel pipe groove is processed when encountering oblique angle in advance, cut surface is closely connected seamless with purlin, and first layer inner support has been welded
Bi Hou, with pumping for water pump to the bottom of lower part purlin, upper and lower purlin center spacing is not more than 4m, to guarantee construction safety, in nothing
Water is arranged second layer purlin before excavating, the installation of purlin and reasonable mechanical are the key that the success or not of this engineering method, in work progress
It is ensured that bolt fastening, weld seam meets code requirement, and diagonal brace, middle support and the connection of purlin are welded using stiffener and ribbed stiffener
Mode, the first setting-out in purlin marks the center of supporting steel pipe, welds veneer stiffener, then supporting steel pipe is welded in
On veneer stiffener, the surrounding of stiffener and supporting steel pipe welding surface is uniformly welded with 4 pieces of ribbed stiffeners, enhances the shearing resistance of welding surface
Property；
Step 7: localized seepage is handled: adding the steel sheet pile that blocks water for making a call to row's arc on the outside of upstream face steel sheet pile, reduce upper water
The impact to cofferdam is flowed, according to actual needs, in geological conditions bad upstream face and back side, every side suitably increases oblique together
Support, to increase the stability in cofferdam, between each layer of diagonal brace plus one to twice I-steel lateral, further strengthens the steady of diagonal brace
It is fixed；
Step 8: removing cofferdam: after the completion of the construction of first segment pier stud, dismountable cofferdam inner support pulls out steel sheet pile, first by second
Layer purlin and bracing demolition simultaneously hang out cofferdam, then 50cm under first layer purlin is filled into cofferdam, and safety removes first layer
Purlin and backing material remove steel sheet pile first by downstream direction, and symmetrical construction to updrift side pulls out hammer cooperation using shake and hangs
Vehicle carries out dismounting operation；
Step 9: cleaning river: after steel sheet pile is removed, removing the clay between steel sheet pile, restore river original appearance, using digging
Machine and dredger clear up the clay left between steel sheet pile, arrange technical staff scene to track in work progress, supervise,
It checks, records the earth volume excavated out in detail, since riverbed absolute altitude can not clearly detect in scale removal process, therefore need to prepare small
Ship and feeler lever are a set of, and after the completion of clearing up within a certain area, testing staff detects cleaning depth with feeler lever immediately, avoid the occurrence of leakage
It digs or the inadequate region of excavating depth.
2. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
I-beam is the 20a I-beam of long 0.7m in rapid one.
3. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
Upper and lower level purlin is all made of the section steel manufacture of Two bors d's oeuveres H400 × 200 in rapid one.
4. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
That has beaten on the face of 4, cofferdam in rapid three will be vertical in the vertical direction with outrigger per a piece of steel sheet pile.
5. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
Lateral inner support uses φ 600mm × 10mm steel pipe in rapid six, and diagonal brace uses φ 400mm × 8mm steel pipe.
6. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
Pull rod is φ 24mm pull rod in rapid five.
7. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
Occur being leveled up when the gap of 1cm or more with steel plate between purlin and steel sheet pile in rapid six.
8. a kind of rock matter riverbed double-layer plate pile cofferdam construction method according to claim 1, it is characterised in that: the step
The surrounding of stiffener and supporting steel pipe welding surface is welded with ribbed stiffener quantity and can freely adjust according to the actual situation in rapid six.
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