CN203034467U - Combined steel pile cofferdam with water-proof fore shafts - Google Patents
Combined steel pile cofferdam with water-proof fore shafts Download PDFInfo
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- CN203034467U CN203034467U CN 201220569451 CN201220569451U CN203034467U CN 203034467 U CN203034467 U CN 203034467U CN 201220569451 CN201220569451 CN 201220569451 CN 201220569451 U CN201220569451 U CN 201220569451U CN 203034467 U CN203034467 U CN 203034467U
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Abstract
The utility model discloses a combined steel pile cofferdam with water-proof fore shafts. The combined steel pile cofferdam with the water-proof fore shafts comprises cofferdam short piles and cofferdam long piles which are respectively and fixedly connected with two adjacent cofferdam short piles; each cofferdam short pile comprises a U-shaped steel plate pile and fore shaft auxiliary pieces, the left end of the U-shaped steel plate pile and the right end of the U-shaped steel plate pile are respectively and fixedly connected with one fore shaft auxiliary piece, each cofferdam long pile comprises a steel pipe pile, a fore shaft main piece which is located on the outer side of the steel pipe pile and a rubber lining which is located in the fore shaft main piece and expands when meets water, each fore shaft main piece is provided with a tubular inner barrel which matches with the fore shaft auxiliary piece and a groove opening which connects the inner portion of the tubular inner barrel and the outer portion of the tubular inner barrel, the rubber lining which expands when meets water is fixedly arranged on the inner wall of the tubular inner barrel, each fore shaft auxiliary piece is sleeved into each tubular inner barrel, and the gap between the fore shaft auxiliary piece and the rubber lining which expands when meets water is filled with expansive soil mixture filler. According to the combined steel pile cofferdam with the water-proof fore shafts, a rigid steel pile and a flexible steel pile are matched and combined to use, advantages are complementary, and the combined steel pile cofferdam with the water-proof fore shafts has the advantages that water-proof performance is good, the fore shafts are reliable in connection, materials are convenient to take, the whole rigidity of the structure is strong, construction is rapid and cost is low, etc.
Description
Technical field
The utility model belongs to the deep water foundation construction field, relates to a kind of cofferdam structure of civil engineering, relates in particular to a kind of combination piling bar cofferdam.
Background technology
Cofferdam structure is the provisional structure in bridge foundation, hydraulic structure construction, and its effect is that retaining soil blocks water.When the depth of water is more shallow, generally adopt earth bag cofferdam, wood sheet-pile cofferdam; In and the river that flow velocity is bigger dark at water, generally adopt steel sheet-pile cofferdam, steel pipe pile cofferdam, steel boxed cofferdam.
Steel sheet-pile cofferdam is the most frequently used a kind of cofferdam form, and the Larsen steel sheet pile is a kind of shaped steel that has the drag hook type fore shaft, that steel sheet pile has is in light weight, easy construction, can reuse, characteristics such as cost is low, in foundation construction, obtained using widely.Homemade clod wash Larsen steel sheet pile, the fore shaft production technology is simple, and the fore shaft spoilage is higher during piling construction; The hot rolling Larsen steel sheet pile good product quality of import, durable in use, but complex manufacturing, the price height.The integral rigidity of steel sheet-pile cofferdam structure is less, and strong and close interior support need be set, and has influenced the operation element face of foundation construction, and steel sheet-pile cofferdam should not be used for the deep foundation work items.Steel sheet-pile cofferdam is through regular meeting's phenomenon of leaking, seep water; its main cause is not carry out the run-off the straight when squeezing into of correction process or steel sheet pile before old steel sheet pile uses; the fore shaft of adjacent two block plate stakes just can not be tight to pegging graft; cause the drag hook type fore shaft to leak, seep water easily, steel sheet-pile cofferdam should not be used for the deep water foundation work items.
Opening locked steel tube pilecofferdam be last century the eighties from the cofferdam structure new technology that Japan introduces, have that water resistance is good, the pile sinking degree of depth is big, integral rigidity big and advantage such as easy construction, in the deep water cofferdam, arrived widely and used.But the opening locked steel tube pilecofferdam cost is higher, and one-time investment is big, and the steel pipe pile solid matter is inserted the vertical precision of beating piling construction and required height, and fore shaft damages easily during pile sinking.After the deep water foundation construction was finished, the volume of the fore shaft steel pipe pile of extracting was bigger, was difficult to break the whole up into parts, and transportation difficulty in strange land is unfavorable for repeatedly reusing, and has influenced the economic benefit of investment of opening locked steel tube pilecofferdam.
Along with the development of bridge engineering and port boat engineering construction, deep water cofferdam project is more and more, the engineering field need badly a kind of waterproof fore shaft connect reliable, integral rigidity is big, water resistance good, expense is lower, the novel assembling waterproof cofferdam of quick construction.Draw the advantage of Larsen steel sheet-pile cofferdam and opening locked steel tube pilecofferdam, utilize dilatancy and the resilient characteristic of hydro-expansive rubber, the new product of research and development Ω shape hydro-expansive rubber waterproof fore shaft, give full play to the advantage separately of steel pipe pile and U-shaped steel sheet pile, adopt steel pipe pile as the main body of cofferdam structure, the enclosing structure that U-shaped steel sheet pile blocks water as retaining soil, various ways piling bar structure and novel hydro-expansive rubber waterproof fore shaft are carried out assembly to be used, hard and soft developing simultaneously, have complementary advantages, can form a kind of novel assembling combination piling bar cofferdam structure.
For novel assembling combination piling bar cofferdam structure, if the drag hook type fore shaft of employing large diameter steel pipe pile outside welded plate band shape and the engaged method of attachment of drag hook fore shaft of Larsen steel sheet pile, the easy stress deformation of drag hook type fore shaft of the strip shape that welds during piling construction, the both sides drag hook is not easy between two parties to straight interlock, drag hook type fore shaft strength and stiffness are lower, water resistance is poor, and drag hook type locking notch structure form is not suitable for the assembling combination piling bar cofferdam of deep water foundation.If adopt C type box and the method for attachment of T type pin thread of opening locked steel tube pilecofferdam, because the integral rigidity of U-shaped steel sheet pile is lower, the fore shaft chucking is relatively more difficult to straight location, causes the fore shaft interlock not tight, can produce percolating water phenomenon, influences the construction operation environment.Therefore, at novel assembling combination piling bar cofferdam structure, need a kind of fore shaft badly and connect the new waterproof fore shaft reliable, that water resistance is good, price is low.
The utility model content
Technical problem: the utility model provides a kind of water resistance of improving cofferdam structure, improves cofferdam construction speed, reduces the combination piling bar cofferdam that has the waterproof fore shaft of cofferdam cost.
Technical scheme: the combination piling bar cofferdam that has the waterproof fore shaft of the present utility model comprises the cofferdam stub and fixedlys connected the long stake in cofferdam of two adjacent cofferdam stubs; The cofferdam stub comprises U-shaped steel sheet pile and fore shaft component, fixedlys connected with a fore shaft component respectively in the two ends, the left and right sides of U-shaped steel sheet pile, and the fore shaft component is the column that is parallel to the U-shaped steel sheet pile edge of a wing; The long stake in cofferdam comprises steel pipe pile, be positioned at the fore shaft parent part in the steel pipe pile outside, be positioned at the hydro-expansive rubber liner of fore shaft parent part, and between steel pipe pile and fore shaft parent part and be connected the two channel-section steel connector, notch inside and outside the fore shaft parent part is provided with the tubulose inner core that is complementary with the fore shaft component and is connected the tubulose inner core, the hydro-expansive rubber liner is fixedly installed on the tubulose inner core inwall, the fore shaft component is inserted in the tubulose inner core, and the slit between fore shaft component and the hydro-expansive rubber pipe liner is filled with swell soil compound filler.
In the utility model, U-shaped steel sheet pile comprise base plate, respectively be arranged at the base plate two ends two webs, be arranged at web end and the edge of a wing parallel with base plate, the fore shaft component is fixedlyed connected with the end on the edge of a wing.
In the utility model, the cofferdam stub also can comprise the stake of H shaped steel, and the lateral surface of a wing plate of H shaped steel stake is fixedlyed connected with a side in the U-shaped mouth of U-shaped steel sheet pile base plate.
In the utility model, the component of swell soil compound filler is by mass percentage: bentonite content 30%～35%, flyash content 15%～20%, red mud content 30%～35%, cement 8%～12%, water glass 3%～5%, waterborne polyurethane resin 1%～2%, pitch flax silk 0.5%～1%.
In the utility model, long stake is the main body force structure of cofferdam structure to spaced apart steel pipe pile as rigidity, U-shaped steel sheet pile plays the enclosing structure function that retaining soil blocks water as flexible stub, and the waterproof fore shaft plays the connection effect between the long stake of rigidity and the flexible stub.In the utility model, the waterproof fore shaft is very important member, and can fore shaft sealing be cofferdam structure key of success problem, and fore shaft connects must be stressed reliable, must have favorable waterproof property.
Hydro-expansive rubber is a kind of rubber new product of uniqueness, and the deformation behavior of its existing general rubber product has the performance of water-swellable again.This kind rubber can produce 2～3 times dilatancy after meeting water, and is full of all irregular surfaces, hole and the gap of seam, produces huge contact pressure simultaneously, thoroughly prevents seepage.The slow swollen type swell soil elastomeric material of extrusion molding is the most ripe hydro-expansive rubber product, at present, water-swelling rubber water bar and hydro-expansive rubber pipe have obtained using widely, be used for the cofferdam locking notch structure if will delay swollen type swell soil rubber tube, can improve the cofferdam structure water resistance.
Design feature according to novel assembling combination piling bar cofferdam, use for reference the structural principle of louver hinge, utilize elastic deformation and the water-swellable performance of swell soil rubber tube product, select for use the hot-rolled steel section production technology to make the finished steel bar of Ω hole shape hot rolling steel as the layer structure of fore shaft parent part, swell soil rubber tube product is as the endothecium structure of fore shaft parent part, and Ω hole shape hot-rolled strip finished product is embedded in the hydro-expansive rubber pipe and constitutes waterproof fore shaft parent part.The Ω shape hot-rolled finished product steel bar structure of square-outside and round-inside can be guaranteed rigidity and the intensity of fore shaft parent part, be conducive to fore shaft parent part and steel pipe pile firm welding, embedded hydro-expansive rubber pipe can guarantee that fore shaft parent part and the interlock of circular fore shaft component are tight, can improve the water resistance that fore shaft connects.Adopt U-shaped steel sheet pile both side ends welding round steel bar as the fore shaft component, also can adopt the U-shaped steel sheet pile finished product that has thick rounded head of the hot rolling technology production fore shaft component of holding concurrently, circular fore shaft component inserts among the Ω shape fore shaft parent part, can realize interlock closely and connect reliable locking notch structure.Utilize bentonitic water resistance, the swell soil compound is filled void space between circular fore shaft parent part and the circular fore shaft component, can further improve the water resistance of locking notch structure, form new waterproof fore shaft system.Ω shape hydro-expansive rubber Waterproof lock port system has advantages such as be connected reliable, simple structure and water resistance are good.
Beneficial effect: the utility model compared with prior art has the following advantages:
The assembling combination piling bar cofferdam that has the waterproof fore shaft of the present utility model mainly is made up of three parts such as the long stake of large diameter steel pipe pile, hydro-expansive rubber waterproof fore shaft, U-shaped steel sheet pile stubs, adopt the long stake of rigidity to use with flexible stub matched combined, hard and soft developing simultaneously had complementary advantages.Combination piling bar of the present utility model cofferdam has that speed of application is fast, water resistance good, draws materials conveniently, fore shaft connects advantages such as reliable, that structural integrity is good, cofferdam structure compliance strong, can repeatedly reuse and price is low, can be widely used in the deep water foundation construction in fields such as bridge engineering, port boat engineering.
Steel pipe pile has the supporting capacity height, passes through the strong characteristics of soil layer ability, as the long stake in new waterproof cofferdam, takes on the agent structure in cofferdam, and structural performance is reliable.In light weight, characteristics such as construction is simple, low price that U-shaped steel sheet pile has can be inserted in the Ω shape fore shaft parent part perps pipe easily, as the stub in waterproof cofferdam, play the enclosing effect that retaining soil blocks water.The long stake of steel pipe pile is interosculated with U-shaped steel sheet pile stub, is used in combination, and has complementary advantages, and can be fit to the cofferdam structure of complex geological condition, has the advantage of quick assembled type structure.
Compare with opening locked steel tube pilecofferdam, adopt U-shaped steel sheet pile part instead of steel pile tube, can save steel, reduce cost, the waterproof fore shaft is easy to connect, can reduce fore shaft stress during pile sinking, simplifies cofferdam construction technology.Compare with U-shaped steel sheet-pile cofferdam, adopt the long stake part of large diameter steel pipe pile to substitute the U-shaped steel sheet pile stub of thin-walled, the strength and stiffness of pile body structure have been improved, improve the ability that piling bar penetrates hardpan, increased bury anchorage depth of piling bar, thereby, can increase the integral rigidity of cofferdam structure, can improve the safety of cofferdam structure, can reduce the quantity of enclosing purlin and interior support, can improve anti-incline performance and the cling property of cofferdam structure.
Utilize dilatancy and the resilient characteristic of hydro-expansive rubber, industrialized mass production Ω shape hydro-expansive rubber waterproof fore shaft finished product has reduced the site operation workload of interlock fore shaft processing and fabricating.Waterproof fore shaft finished product has met the thinking of development of combination piling bar cofferdam structure spelling dress mounting technology as the assembly unit part, has simplified the fore shaft construction technology, guarantees the machining accuracy of locking notch structure, improves the speed of application in cofferdam.Characteristics such as the waterproof fore shaft parent part finished product that Ω hole shape hot-rolled strip finished product is embedded in the hydro-expansive rubber pipe has that structural strength is big, volume is little, simple structure, good water-proof effect, machining accuracy height and price are low, waterproof fore shaft parent part external surface adopts rectangular profile, is conducive to firmly weld with large diameter steel pipe pile.The inner surface of waterproof fore shaft parent part is the Ω tee section form that has vertical seam, is conducive to circular Waterproof lock openning spare piling and inserts.
Adopt U-shaped steel sheet pile both sides to turn up the thick circular rod iron of both sides, edge of a wing welding as Waterproof lock openning spare, the structure simple structure is drawn materials conveniently.The circular rod iron of Waterproof lock openning spare bottom arranges conical steel guide head, and circular rod iron Waterproof lock openning spare can successfully insert in the fore shaft parent part, on one side slotting beating, fore shaft interlock jam-packed on one side.The new waterproof locking notch structure have interlock closely, fore shaft connects stressed reliable and construct easy characteristics.
Swell soil compound water-swellable stagnant water effect is good, has certain viscosity and elasticity, just as artificial spongy soil, spring soil, adopt the swell soil mixed slurry as the waterproof inserts of Ω shape expanded rubber waterproof fore shaft, have the advantages that price is low, water resistance good, viscoelastic property is good, shear strength is moderate.Swell soil compound shear strength is moderate, during cofferdam demolition, pulls out the piling bar easy construction.The viscosity of swell soil compound can be regulated with watering quantity, and the swell soil compound can adopt the catheter perfusion method to pour into the waterproof fore shaft.The swell soil compound also can directly spread upon the rounded internal surface of Ω shape fore shaft parent part, also can spread upon circular fore shaft component rod iron external surface, and the swell soil compound enters fore shaft inside during along with the piling bar pile sinking.
The perfect cooperation coupling of the long stake of large diameter steel pipe pile, U-shaped steel sheet pile stub, swell soil compound and Ω shape hydro-expansive rubber waterproof fore shaft can provide a construction environment that civilization is safe to the deep water foundation construction.
Description of drawings
Fig. 1 is combination piling bar of the present utility model cofferdam schematic diagram;
Fig. 2 is the stub schematic diagram in combination piling bar cofferdam;
Fig. 3 is the long stake schematic diagram in combination piling bar cofferdam;
Fig. 4 is the structural representation of waterproof fore shaft;
Fig. 5 is assembling combination piling bar cofferdam general layout schematic diagram of the present utility model.
Have among the figure: cofferdam stub 1, U-shaped steel sheet pile 11, fore shaft component 12, H shaped steel stake 13, the long stake 2 in cofferdam, steel pipe pile 21, fore shaft parent part 22, tubulose inner core 221, notch 222, hydro-expansive rubber liner 23, channel-section steel connector 24, swell soil compound filler 3.
The specific embodiment
Be further described in detail below in conjunction with Figure of description and the utility model of embodiment.
The combination piling bar cofferdam that has the waterproof fore shaft of the present utility model comprises cofferdam stub 1 and fixedlys connected the long stake 2 in cofferdam of two adjacent cofferdam stubs 1; Cofferdam stub 1 comprises U-shaped steel sheet pile 11 and fore shaft component 12, U-shaped steel sheet pile 11 comprise base plate, respectively be arranged at the base plate two ends two webs, be arranged at web end and the edge of a wing parallel with base plate, fixedly connected with a fore shaft component 12 respectively in the end on the edge of a wing, the left and right sides, fore shaft component 12 is for being parallel to the column on U-shaped steel sheet pile 11 edges of a wing; The long stake 2 in cofferdam comprises steel pipe pile 21, be positioned at the fore shaft parent part 22 in steel pipe pile 21 outsides, be positioned at the hydro-expansive rubber pipe liner 23 of fore shaft parent part 22, and between steel pipe pile 21 and fore shaft parent part 22 and be connected the two channel-section steel connector 24, fore shaft parent part 22 is provided with the tubulose inner core 221 that is complementary with fore shaft component 12 notch 222 inside and outside with being connected tubulose inner core 221, hydro-expansive rubber pipe liner 23 is fixedly installed on tubulose inner core 221 inwalls, fore shaft component 12 is inserted in the tubulose inner core 221, and the slit between fore shaft component 12 and the hydro-expansive rubber pipe liner 23 is filled with swell soil compound filler 3.
Among the embodiment of the present utility model, cofferdam stub 1 also comprises H shaped steel stake 13, and the lateral surface on an edge of a wing of H shaped steel stake 13 is fixedlyed connected with the interior side of the U-shaped mouth of U-shaped steel sheet pile 11 base plates.
The component of the swell soil compound filler 3 in the utility model is by mass percentage: bentonite content 30%～35%, flyash content 15%～20%, red mud content 30%～35%, cement 8%～12%, water glass 3%～5%, waterborne polyurethane resin 1%～2%, pitch flax silk 0.5%～1%.
Embodiment 1:
The combination piling bar cofferdam that has the waterproof fore shaft of the present utility model, by steel pipe pile, U-shaped steel sheet pile, Ω hole shape steel fore shaft parent part, Ω hole shape hydro-expansive rubber pipe, fore shaft component round steel bar, swell soil compound filler, channel-section steel connector and the stake of H shaped steel constitute, steel pipe pile is as the long stake of cofferdam structure, U-shaped steel sheet pile is as the stub of cofferdam structure, Ω hole shape steel fore shaft parent part is embedded in Ω hole shape hydro-expansive rubber pipe as waterproof fore shaft parent part, fore shaft component round steel bar inserts among the Ω hole shape hydro-expansive rubber pipe, and the cavity between Ω hole shape hydro-expansive rubber pipe and the fore shaft component rod iron adopts the perfusion of swell soil compound filler closely knit.
The fore shaft parent part is by the hot-rolled strip finished product and be embedded in the hydro-expansive rubber pipe and constitute, transportation for convenience, and hot-rolled strip finished product cutting length is preferably 1～2 meter; Water-swellable swell soil rubber tube is 100 meters long dish circle shape thing, and its cutting length can be according to the blanking of actual needs length.At the construction field (site), shape hot-rolled strip finished product adopts the segmented hydro-expansive rubber tube outside that is enclosed within of series connection method, select for use waterproof construction glue with hot-rolled strip finished product and hydro-expansive rubber pipe strong bond, also connect with waterproof construction is gluing between multi-segmental Ω hole shape hot-rolled strip finished product seam, guarantee that percolating water phenomenon does not take place seam crossing.After waiting for that waterproof construction adhesive curing knot is hard, adopt cutting machine that the hydro-expansive rubber pipe is carried out vertical slot, formation has the Ω shape hydro-expansive rubber pipe of perps, realize the waterproof fore shaft parent part of the embedded Ω shape of Ω hole shape hot-rolled strip hydro-expansive rubber pipe, just can form the waterproof fore shaft parent part finished product of assembling combination piling bar cofferdam Len req.
Waterproof lock openning spare is the important component that connects waterproof fore shaft parent part, should firmly be connected to become integral body with U-shaped steel plate, should guarantee the structural strength of Waterproof lock openning spare.During the large-sized deep water cofferdam, should adopt the U-shaped steel sheet pile of having of hot rolling technology production of thick rounded head fore shaft component, also can adopt welding thick circular rod iron in U-shaped steel sheet pile both sides as Waterproof lock openning spare.During middle-size and small-size cofferdam, should adopt assembling fore shaft component, can adopt U-shaped steel sheet pile both sides to turn up and make a call to row's circular hole, two semicircular steel bar assemblings lock connection fasteners of bolt on the edge of a wing, the half-round bar inboard arranges waterproof rubber sheet, forms Waterproof lock openning spare; Also can adopt the edge of a wing of turning up, the both sides of U-shaped steel sheet pile firmly to be welded with the seam round steel pipe, the concrete of cavity filling between the two forms Waterproof lock openning spare.
Waterproof fore shaft parent part is the square-outside and round-inside finished product that Ω hole shape hot-rolled strip is embedded in the hydro-expansive rubber pipe, and by the link slot steel part, the fore shaft parent part can firmly be welded on the outside of steel pipe pile, and when steel pipe pile piling was sunk to, waterproof fore shaft parent part also while pile sinking put in place.Adopt the catheter perfusion method, the swell soil mixed slurry is poured into round empty cavity in the fore shaft parent part, in order to further guarantee to make up the water resistance in piling bar cofferdam.Waterproof lock openning spare is the circular rod iron that firmly is welded on U-shaped steel sheet pile both sides, and conical steel guide head is installed in the bottom of circular rod iron, can successfully insert in the fore shaft parent part 22, on one side slotting beating, fore shaft interlock jam-packed on one side.Because U-shaped steel sheet pile has certain flexibility, between waterproof box and the waterproof button certain dilatation ability is arranged in the horizontal direction, certain turning power is also arranged, the new waterproof fore shaft belongs to flexible fore shaft and connects, when omiting the piling construction of low dip, can not produce bigger fore shaft complex stress.
The long stake of steel pipe pile outside welding groove steel fastener, the strip finished product of channel-section steel connector outside welding Ω hole shape steel fore shaft parent part and embedded Ω hole shape hydro-expansive rubber pipe thereof, four are linked to be integral body, and pile sinking puts in place together.
The turn up edge of a wing and fore shaft component round steel bar of the both sides of U-shaped steel sheet pile firmly welds, and the stake of H shaped steel is to be welded on U-shaped steel sheet pile medium position, and the three is linked to be integral body, and pile sinking puts in place together.
Embodiment 2:
The job practices that has the combination piling bar cofferdam of waterproof fore shaft of the present utility model may further comprise the steps:
Step 1 is determined the planar dimension in waterproof cofferdam according to the scope of water conservancy project structure or bridge pier, and the riverbed is cleared up, and avoids inserting at piling bar and beats the position and run into obstruction, accurate setting out survey, installation leading truck;
Top flange welding fore shaft component round steel bar turns up in the both sides of step 4U shaped steel sheet pile, the stake of U-shaped steel sheet pile medium position welded H section steel, form waterproof cofferdam stub, steel taper guide head is installed in fore shaft component round steel bar bottom,, fore shaft component round steel bar inserts in the Ω hole shape hydro-expansive rubber pipe, adopts pile driving equipment, insert and encircle and hunt down weir stub arrival projected depth, form assembling combination piling bar cofferdam.
Embodiment 3:
Certain cofferdam is shaped as rectangle, and long 15 meters, width is 10 meters, and the cofferdam depth of water is 10 meters, and the pier footing underwater excavation degree of depth is 5 meters.Select for use diameter be 800mm, wall thickness be the steel pipe pile of 16mm as the long stake in cofferdam, the steel pipe pile Design of length is 30 meters.Select for use width be 1200mm, highly for 300mm, wall thickness be the U-shaped steel sheet pile of clod wash of 14mm as the stub in cofferdam, U-shaped steel sheet pile length is designed to 24 meters.Select for use the shaped steel rest of H350*250*10*14 to reinforce U-shaped steel sheet pile, the stake of H shaped steel is long to be designed to 26 meters.Adopt hot rolling molding process to produce Ω hole shape steel fore shaft parent part, the fore shaft parent part is shaped as square-outside and round-inside, and external surface adopts width to be 160mm, highly to be the square of 160mm that inner surface is the circle of diameter 110mm.Adopt Ω hole shape hydro-expansive rubber pipe finished product to embed Ω hole shape steel fore shaft parent part as the waterproof parent part, Ω hole shape hydro-expansive rubber pipe outside diameter is 110mm, and interior circular diameter is 90mm, and wall thickness is 10mm.The fore shaft component is diameter 70mm rod iron, rod iron bottom screw connection steel taper guide head, and U-shaped steel sheet pile and fore shaft component round steel bar weld together.The employing weight proportion is: bentonite content 32%%, flyash content 16%%, red mud content 35%, and cement 10%, water glass 4%, waterborne polyurethane resin 2%, the swell soil compound of pitch flax silk 1% is as the waterproofing and leakage-stopping filler.Adopt No. 20 channel-section steels as the channel-section steel connector.The center distance of cofferdam large diameter steel pipe pile is 2.5 meters, and long limit arranges 7 large diameter steel pipe piles and 6 U-shaped steel sheet piles, and minor face arranges 5 steel pipe piles and 4 U-shaped steel sheet piles.Enclose purlin and adopt H shaped steel, steel pipe is adopted in interior support.Contrast traditional steel pipe pile cofferdam and steel sheet-pile cofferdam, novel assembling combination piling bar cofferdam has that speed of application is fast, water resistance good, fore shaft connects reliable and advantage such as price is low, has obtained good economic benefit.
The main construction techniques flow process is: preparation of construction---the location setting-out---leading truck is installed---and the large diameter steel pipe sunk pile---fore shaft perfusion swell soil compound---insert and beat U-shaped steel sheet pile---cofferdam is supported construction---excavation that draws water, concrete back cover---and is watered underpin, and concrete construction technology main points are as follows:
(1) preparation of construction, location setting-out
According to the size of water conservancy project structure or pier footing, determine geometry and the planar dimension in waterproof cofferdam.Carry out field investigation, collect data such as geology, landforms, the hydrology.The riverbed is carried out cleaning work, avoid beating combination piling bar position and running into obstruction inserting.
Accurate setting out survey is installed leading truck, positions the construction of stake.Organizing construction's material and construction machinery put in place, carry out the processing and fabricating of assembling combination piling bar cofferdam structure member, build interim construction bridge.
During large diameter steel pipe pile welding spreading, must guarantee straightly, the steel pipe pile welding should be adopted the groove welding method, and steel pipe pile outside welding groove steel fastener forms the connection plane, with fore shaft parent part 22 and large diameter steel pipe pile firm welding, so that pile sinking puts in place together.
Fore shaft parent part 22 is the important components in novel assembling combination piling bar cofferdam, and rectangular shape is adopted in the outside of fore shaft parent part, can firmly be welded to connect with steel pipe pile easily; Its inner round cross section that adopts can be connected with circular fore shaft component easily.When large-scale combination piling bar cofferdam structure, the fore shaft parent part 22 suitable preferential finished products that adopt the hot-rolled steel processing technology to make arrange water-swellable swell soil rubber tube in the Ω shape hole, irritate the swell soil mixed slurry in the pipe, should arrange supply of goods as early as possible; Also can adopt the finished product of C shaped steel outsourcing Ω hole shape hydro-expansive rubber bar.For small-sized cofferdam structure, also adopt C shaped steel and thin-walled have between the seam round steel pipe in the steel reinforced concrete member that forms of concrete placing as the fore shaft parent part, in order to gather materials on the spot, reduce the cost cost, but should guarantee machining accuracy.
During the large-sized deep water cofferdam, should adopt the U-shaped steel sheet pile of having of hot rolling technology production of thick rounded head fore shaft component, should arrange supply of goods as early as possible, transportation puts in place; Also can adopt welding thick circular rod iron in U-shaped steel sheet pile both sides as Waterproof lock openning spare, U-shaped steel sheet pile should carry out straightening processing in advance to be handled.During small-sized cofferdam, can adopt U-shaped steel sheet pile both sides to turn up and make a call to row's circular hole on the edge of a wing, two semicircular built-up member of bolt form Waterproof lock openning spare; Also can adopt the edge of a wing of turning up, the both sides of U-shaped steel sheet pile firmly to be welded with the seam round steel pipe, the concrete of cavity filling between the two forms Waterproof lock openning spare.
(2) large diameter steel pipe sunk pile
Steel pipe pile has the supporting capacity height, penetrate the soil layer ability strong, squeeze into soil depth beat greatlyyer, anti-, from advantages such as heavy and lights, engineering circle is often as the type selecting stake of complicated soil layer.Steel pipe pile pile sinking mode can adopt construction method, vibration construction method, the hydraulic construction method of impacting.Select for use steel pipe pile as the long stake of rigidity in novel assembling waterproof combination piling bar cofferdam, it is the main bearing member in combination piling bar cofferdam, guarantee the strength and stiffness of combination piling bar cofferdam structure, piling construction should guarantee to arrive projected depth, guarantees combination piling bar cofferdam skid resistance and resistance to capsizing.
Should strictly control its vertical verticality during the steel pipe pile pile sinking, the excessive gradient of steel pipe pile will cause U-shaped steel sheet pile pitching pile difficulty, the solid matter piling bar leads the effect of dragging mutually, the excessive inclination of piling bar pile body will make that fore shaft stress is excessive and cause fore shaft to produce gross distortion and damage, and the steel pipe pile pile sinking allows gradient that long 1% the controlling of stake can be installed.
The steel pipe pile outside firmly is welded to connect channel member, connects the plane in order to form, link slot steel part and fore shaft parent part 22 firm firm welding, and put in place with the large diameter steel pipe pile pile sinking.Link slot steel part length should be greater than 0.5～1.0 meter of waterproof fore shaft parent part length, and waterproof fore shaft parent part length should be greater than 0.5～1.0 meter of U-shaped steel sheet pile length, and U-shaped steel sheet pile length can be 70%～90% of steel pipe pile length.
In order to stop rubble and pan soil to enter fore shaft, before inserting under steel pipe pile piling, the bottom of fore shaft parent part 22 can be welded the steel shoe that the gradient is 1:6 in advance.
(3) fore shaft pours into the swell soil compound
The fore shaft water resistance is assembling combination piling bar cofferdam key of success problem, between fore shaft parent part 22 and the fore shaft component 12 certain cavity is arranged, and should adopt the waterproof packing material of high-quality to tamp, and guarantees that infiltration, drainage do not appear in fore shaft.Waterproof packing material shear strength can not be too high, so that after underwater foundation construction finished, the combination piling bar of cofferdam structure can be extracted repeated use easily.At present, what adopt usually is the cement mortar inserts, good waterproof performance, but because cement mortar inserts intensity is too high, when removing the cofferdam, is difficult to extract piling bar and recycles and reuses; The clay cement grout inserts, low price, when removing the cofferdam, piling bar is extracted conveniently, and still, this material can produce shrinkage strain, and the water-tight performance is general, can produce percolating water phenomenon; Modified asphalt waterproof sealing compound, good waterproof performance can make things convenient for piling bar to extract, and still, price is expensive, and environment is had certain pollution.The waterproof packing material that a kind of price is low, water resistance good, perfusion is convenient, shear strength is moderate is needed in assembling combination piling bar cofferdam badly.
Swell soil has very strong hygroscopicity, can absorption be equivalent to the water of 8～20 times of own vols and be expanded to 30 times, in aqueous medium, can disperse to present soliquid, and have certain viscosity, thixotropy and a lubricity, the mixture of it and silt etc. has plasticity and caking property, stronger cation exchange capacity (CEC) and adsorption capacity are arranged, and engineering circle is extensively utilized the swell soil favorable waterproof property.In order to reduce cost, for reducing the expansion force of steel pipe fore shaft inside, science configuration swell soil compound as the packing material of waterproof fore shaft, can be guaranteed the cofferdam water resistance.Weight proportion is: bentonite content 30%～35%, flyash content 15%～20%, red mud content 30%～35%, cement 8%～12%, water glass 3%～5%, waterborne polyurethane resin 1%～2%, the swell soil compound of pitch flax silk 0.5%～1%, swell soil compound water-swellable stagnant water effect is good, has certain viscosity and elasticity, just as artificial " spongy soil, spring soil ", shear strength is fit to be conducive to pile pulling, is used for the cofferdam fore shaft and will has good water-tight performance.Can form the swell soil mixed slurry behind the swell soil compound thin up, the viscosity of swell soil mixed slurry can be regulated with watering quantity, and the swell soil mixed slurry can adopt the catheter perfusion method to pour into the waterproof fore shaft.
Fore shaft pours into the critical process that the bentonite waterproof compound is assembling combination piling bar cofferdam waterproof construction, in order to prevent that the swell soil mixed slurry runs off in water, should adopt the adhesive tape sealing label in the vertical straight joint outside of fore shaft parent part 22, temporarily carry out the sealing of fore shaft pipe.Adopt grouting guiding steel pipe to be inserted into the bottom of fore shaft parent part 22, the upward pressure perfusion at the bottom of the hole of swell soil mixed slurry promotes conduit while irritating, directly end the aperture and overflow till the swell soil mixed slurry, advises that conduit imbeds the swell soil mixed slurry and be not less than 2m length.Waterproof effect in order to ensure the swell soil compound, can adopt specialist tools, smear the thick bentonite waterproof compound coating of 3～5mm in advance at the inner surface of fore shaft parent part 22, smear the thick bentonite waterproof compound coating of 2～3mm in advance at the external surface of fore shaft component steel pipe, guarantee the stagnant water effect of waterproof fore shaft.
(4) U-shaped steel sheet pile is inserted and is beaten
U-shaped steel sheet pile has advantages such as intensity is higher, light-duty, construction is simple, soil compaction effect is low, economical with materials, engineering circle Chang Zuowei cofferdam spile pile.Selecting for use U-shaped steel sheet pile as the stub in novel assembling combination piling bar cofferdam, is the less important primary structure member in combination piling bar cofferdam, plays the effect of the native enclosing member that blocks water of retaining.For improving the penetration capability of beating of inserting of the U-shaped steel sheet pile of wide amplitude type, the stake of H shaped steel can be welded on U-shaped steel sheet pile middle part, also can improve the integral rigidity of U-shaped steel sheet pile simultaneously.
The U-shaped steel sheet pile two ends thick circular steel clavate of welding becomes Waterproof lock openning spare, circular rod iron bottom should arrange conical steel guide head, insert when beating at U-shaped steel sheet pile, so that circular rod iron Waterproof lock openning spare can successfully insert in the fore shaft parent part 22 of water-swellable, insert on one side and beat, on one side fore shaft interlock jam-packed.Circular fore shaft component and the tubulose inner core of fore shaft parent part 22 are better identical, easy to assembly, and the lock connection is reliable, insert and break pile sinking conveniently.
Because U-shaped steel sheet pile has certain dilatation ability and turning power, novel fore shaft is connected with certain flexibility, and when U-shaped steel sheet pile omited the low dip pile sinking, the fore shaft member can not produce bigger fore shaft distortion, can not produce bigger complicated fore shaft stress.
At the external surface of the circular fore shaft component of U-shaped steel sheet pile, smear the thick bentonite waterproof compound coating of 2～3mm, meet water-solubleization expansion while insert, can further guarantee the stagnant water effect of waterproof fore shaft.
(5) construction is supported in the cofferdam
Assembling fore shaft piling bar can enclose purlin and interior support construction after inserting and beating the formation cofferdam that finishes.In order to increase the structural stability in waterproof cofferdam, increase the ability of cofferdam structure opposing water and soil pressure, the multiple tracks waterproof should be set enclose the purlin support.Draw water on one side, enclose the purlin support Yi Bian progressively increase.
(6) draw water excavation, concrete back cover
When stratum, cofferdam water permeability hour, can adopt the excavation method of drawing water, the excavation that draws water can adopt hand excavation or mini-excavator excavation.During excavation, establish the gutter in the cofferdam all around, be equipped with the water pumper of sufficient amount.After foundation excavation is finished, can directly carry out bottom concrete and build.
When stratum, cofferdam water permeability is big, should adopt the excavation method of not drawing water.The excavation that do not draw water is optional with waterpower suction dredge, air suction dredge etc.If run into soil layer more closely, should adopt the water jetting at high pressure method to cooperate and loosen the soil, dig based method under water to accelerate the basic speed of excavation, also can adopt grabbing bucket, excavator etc.During the excavation basis, running into boulder can be eliminated by dirver's underwater operation.
Cofferdam foundation ditch for the excavation basis of not drawing water should adopt the underwater casting concrete, carries out the operation of concrete back cover.Should be according to the degree of mobilization of back cover area and underwater concrete, multiple spot layout bottom concrete is built conduit, and bottom concrete is built thickness should be even.
The combination piling bar cofferdam that has the waterproof fore shaft of the present utility model, taken full advantage of the advantage separately of steel pipe pile and U-shaped steel sheet pile, spaced apart large diameter steel pipe pile is as the long stake of rigidity of waterproof cofferdam structure, as the main body force structure in waterproof cofferdam, U-shaped steel sheet pile plays the enclosing structure function as the flexible stub of waterproof cofferdam structure, long stake and stub collocation are used, have complementary advantages, hard and soft developing simultaneously optimized the cofferdam structure system.Hydro-expansive rubber waterproof fore shaft connects reliable, simple structure, and perfusion swell soil mixed slurry further improves the water resistance that fore shaft connects in the fore shaft parent part, guarantees to make up piling bar cofferdam structure waterproof requirement.Advantages such as novel assembling combination piling bar cofferdam has quick construction, water resistance is good, structural integrity is strong, can repeatedly reuse and price is low meet the requirement of deep water foundation cofferdam.The long pile length of rigidity is between suitable 10m～50m, and the length of flexible stub can be 70%～90% of long stake.
Claims (3)
1. a combination piling bar cofferdam that has the waterproof fore shaft is characterized in that, this combination piling bar cofferdam comprises cofferdam stub (1) and fixedlys connected the long stake in cofferdam (2) of two adjacent described cofferdam stubs (1);
Described cofferdam stub (1) comprises U-shaped steel sheet pile (11) and fore shaft component (12), fixedly connected with a fore shaft component (12) respectively in the two ends, the left and right sides of described U-shaped steel sheet pile (11), described fore shaft component (12) is for being parallel to the column on U-shaped steel sheet pile (11) edge of a wing;
The long stake in described cofferdam (2) comprises steel pipe pile (21), be positioned at the fore shaft parent part (22) in described steel pipe pile (21) outside, be positioned at the hydro-expansive rubber liner (23) of described fore shaft parent part (22), and be positioned between described steel pipe pile (21) and the fore shaft parent part (22) and be connected the two channel-section steel connector (24), described fore shaft parent part (22) is provided with tubulose inner core (221) notch (222) inside and outside with being connected described tubulose inner core (221) that is complementary with fore shaft component (12), described hydro-expansive rubber liner (23) is fixedly installed on described tubulose inner core (221) inwall, fore shaft component (12) is inserted in the tubulose inner core (221), and the slit between fore shaft component (12) and the hydro-expansive rubber liner (23) is filled with swell soil compound filler (3).
2. the combination piling bar cofferdam that has the waterproof fore shaft according to claim 1, it is characterized in that, described U-shaped steel sheet pile (11) comprise base plate, respectively be arranged at described base plate two ends two webs, be arranged at described web end and the edge of a wing parallel with base plate, described fore shaft component (12) is fixedlyed connected with the end on the edge of a wing.
3. the combination piling bar cofferdam that has the waterproof fore shaft according to claim 1 and 2, it is characterized in that, described cofferdam stub (1) also comprises H shaped steel stake (13), and the lateral surface on an edge of a wing of described H shaped steel stake (13) is fixedlyed connected with the interior side of the U-shaped mouth of U-shaped steel sheet pile (11) base plate.
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| CN105064375A (en) * | 2015-08-17 | 2015-11-18 | 化学工业岩土工程有限公司 | Construction method of retaining and water stopping structure of foundation pit support |
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| CN108166479A (en) * | 2017-12-22 | 2018-06-15 | 中国建筑股份有限公司 | Combined steel sheet pile building enclosure and its construction method |
| CN108166479B (en) * | 2017-12-22 | 2023-08-01 | 中国建筑股份有限公司 | Combined steel sheet pile enclosure structure and construction method thereof |
| CN108842775A (en) * | 2018-08-02 | 2018-11-20 | 中交武汉港湾工程设计研究院有限公司 | Stake top clamp brace type steel-pipe pile pile sinking is guide locating device provided and its construction method |
| CN109372031A (en) * | 2018-12-19 | 2019-02-22 | 中铁二局集团有限公司 | A kind of sealing material for steel pipe pile cofferdam lock |
| CN111691400A (en) * | 2019-03-14 | 2020-09-22 | 宝山钢铁股份有限公司 | Precast concrete tubular pile with hidden embedded lock catch and manufacturing method thereof |
| CN110565630A (en) * | 2019-09-24 | 2019-12-13 | 上海市水利工程集团有限公司 | High-strength ecological combined sheet pile for river channel permanent bank protection structure |
| CN110616718A (en) * | 2019-10-14 | 2019-12-27 | 江苏海洋大学 | Rectangular locking steel pipe pile and enclosure structure comprising same |
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