1541 results about "Sheet pile" patented technology

A sheet pile module with at least three sheet piles including a central sheet pile, wherein the central sheet pile has a first coupling segment with a first coupling feature along a first longitudinal edge, a second coupling segment with a second coupling feature along a second longitudinal edge that is opposite and parallel to the first longitudinal edge, and an intermediate segment between and connected to the first coupling segment and to the second coupling segment, a first U-sheet or Z-sheet pile is connected to the first coupling feature, and a second U-sheet or Z-sheet pile is connected to the second coupling feature.

The invention discloses a double-row steel sheet pile cofferdam construction method, which comprises the following steps of: before construction, measuring the original riverbed elevation of a cofferdam piling area, organizing steel pipes to enter a site according to a cross-section diagram and a construction sequence of a cofferdam, timely removing and recording if stone blocks and the like at the river bottom are measured in the measurement process, and before construction, checking and maintaining all mechanical equipment, so that the construction efficiency is improved. After entering the field, the steel pipes are stacked according to specifications, varieties and classifications, before pile conveying, the models and the number of the steel pipes used during construction are determined, and the steel pipes are arranged strictly according to the designed section. Compared with a construction scheme of adopting a Larsen steel sheet pile cofferdam and a temporary construction platform, the construction cost, the rental cost, the earthwork transportation cost, the earthwork compaction cost, the earthwork filling excavation filling cost and the like of temporary facilities can be saved, building construction is carried out in a water area needing a large area, the construction period is long, and the construction cost is low. The method is more economical and reasonable when being used for constructing structures in water under the conditions of high water level and the like.

The present invention relates to an assembled steel sheet pile enclosure structure and a construction apparatus and construction method therefor. A waterproof curtain of the enclosure structure is formed by continuously assembling a plurality of steel sheet piles. Guide-rail-type steel enclosing purlins are detachably connected to the waterproof curtain. Self-adaptive flange devices are detachably connected to the guide-rail-type steel enclosing purlins. A hydraulic device, a moving pile clamping device, a vertical rod, and a fixed pile clamping device of the construction apparatus are sequentially connected from bottom to top and are fixed to one side of a base; a counterweight block is fixed on the other side of the base; and pressure-adjustable tires are arranged at the bottom of the base. The construction method comprises: a pushing rod moving towards a foundation pit; a connecting rod assembly driving a moving gear to extend out of a housing and be engaged with a rack of the corresponding guide-rail-type steel enclosing purlin; driving the moving gear to rotate and drive the corresponding self-adaptive flange device to slide to a steel support mounting position along the rack; the pushing rod moving in the direction facing away from the foundation pit; the connecting rod assembly driving the moving gear to be disengaged from the rack; and a brake synchronously extending out of the housing and being meshed and fixed with the rack.

The invention relates to the technical field of building construction, in particular to a supporting system based on double-row steel sheet piles and grouting steel pipe piles and a construction method, the supporting system comprises inner-row steel sheet piles, outer-row steel sheet piles and steel enclosing purlins, and the inner-row steel sheet piles and the outer-row steel sheet piles comprise the inner-row steel sheet piles and the outer-row steel sheet piles; the inner-row steel sheet piles and the outer-row steel sheet piles are arranged in parallel and then are connected in a welded mode through steel enclosing purlins, and triangular steel brackets are arranged at the positions, connected with the inner-row steel sheet piles and the outer-row steel sheet piles, below the steel enclosing purlins. According to the technical scheme, the inner row steel sheet piles and the outer row steel sheet piles are connected into an overall stress system, compared with cantilever type steel sheet piles, stress is definite, deformation of the steel sheet piles is small, safety is good, the steel sheet piles are suitable for large excavation depth, influences on peripheral pipelines are avoided, and then cost is saved.

The invention discloses a double-row steel sheet pile and soil core combined cofferdam structure and a construction method. The double-row steel sheet pile and soil core combined cofferdam structure comprises double-row pile connecting units, steel sheet piles, brackets, steel enclosing purlins, dredger fill and drainage plates. Each double-row pile connecting unit is formed by welding an upper connecting plate between two connecting steel sheet piles; the double-row pile connecting units are inserted into a soil body, and a steel sheet pile is inserted between every two double-row pile connecting units; corbels are welded to the outer sides of the steel sheet piles, steel enclosing purlins are arranged on the corbels, and the steel enclosing purlins, the steel sheet piles and the corbels are connected in a welded mode; dredger fill is filled between the two rows of steel sheet piles and is compacted by a hammer-attached soil squeezer; a drainage plate is inserted into the dredger fill; earth excavation is conducted on the side, close to water, of the double-row pile cofferdam to form a foundation pit; when shallow excavation is conducted on the foundation pit, no sand filling pipe bag is arranged; when the foundation pit is deeply excavated, a slope section is reserved; sand filling pipe bags are arranged on the outer side of the slope section and stacked on the outer side of the slope section in a staggered mode. The hammer-attached soil squeezing device comprises an attached hammer, a pressing plate, water permeable holes, geotechnical cloth and a brush.

A steel sheet pile construction method, comprising: a first step of performing an anti-corrosion treatment on steel sheet piles (4); a second step of placing, according to a design drawing, a plane position line for pile sinking, controlling designed elevations of the steel sheet piles (4) according to an existing elevation point, and performing measurement, paying-off and positioning; a third step of mounting a steel sheet pile guide frame (3) on a trestle (1) pre-built behind a berth and a pre-driven cast-in-place pile (2); a fourth step of marking a number on each of the steel sheet piles (4) according to a driving sequence, marking scale water lines on the steel sheet piles (4), transporting the steel sheet piles (4) to the trestle (1) behind the berth, and brushing lock catches of the steel sheet piles (4) with butter; a fifth step of driving the steel sheet piles (4) with the aid of the steel sheet pile guide frame (3); and a sixth step of mounting an anode protection block on an underwater portion of each steel sheet pile (4). The method is used in combination with a steel sheet pile guiding mechanism, which enables accurate positioning and driving of the steel sheet piles.

The invention belongs to the technical field of steel sheet piles, and discloses a steel sheet pile for compensating stratum loss during pile pulling and a construction method.The steel sheet pile comprises a plurality of steel sheet pile units, and each steel sheet pile unit comprises a plurality of steel sheet piles; the foundation pit sides of the steel sheet pile units are connected with a plurality of compensation bags, and grouting systems are arranged on the foundation pit sides of the compensation bags. The foundation pit side of the steel sheet pile is coated with viscous grease, the side, facing the steel sheet pile, of the compensation bag is coated with pressure-sensitive adhesive, and the compensation bag is temporarily connected with the steel sheet pile; the grouting system comprises a main grouting pipe, the bottom of the main grouting pipe is connected with a horizontal grouting pipe, the side, facing the steel sheet pile, of the horizontal grouting pipe is connected with a plurality of flow dividing pipes, and the flow dividing pipes correspond to the compensation bags. A vertical branch pipe is upwards separated from the middle position of the flow dividing pipe, and is connected with a grouting connector at the bottom end of the corresponding compensation bag; the tail end of the flow dividing pipe is downwards divided into an inclined grouting pipeline, and the inclined grouting pipeline faces the lower portion of the steel sheet pile. The technical problem that filling is not timely due to the fact that grouting pipes are installed to fill gaps after steel sheet piles are pulled out in the prior art is solved.

The invention discloses a steel sheet pile cofferdam and underwater pier construction technology suitable for a geological environment near a water area. The steel sheet pile cofferdam and underwater pier construction technology comprises the following steps that the position of a steel sheet pile wall is planned; constructing a guide frame body for assisting in inserting and driving the steel sheet piles corresponding to the position of the steel sheet pile wall; steel sheet piles are sequentially and vertically inserted in the positions, corresponding to the steel sheet pile wall, of the guide frame body in a locking mode, and the steel sheet pile wall is formed; and closing operation is conducted according to the head end and the tail end of the formed steel sheet pile wall. The technical problem that in the prior art, a steel sheet pile cofferdam construction technology is not high in function applicability in the aspects of steel sheet pile inserting and driving quality, a foundation pit excavation and supporting system and construction environment adaptability is solved.

The invention belongs to the technical field of foundation pit supporting, and particularly relates to a steel sheet pile joint sealing performance in-situ detection process and a monitoring method. Through the cooperative design of the embedded pipe and the detection hole, the embedded pipe is filled with the liquid reagent, and if leakage happens to the joint of the steel sheet pile, the solid reagent in the detection hole can make contact with the liquid reagent to change color. Leaking stoppage is carried out after the color changing position is detected, and long-term monitoring is carried out by monitoring the soil body index of the leaking position so as to be used as a supplement of a detection process. The problem of ex-situ detection of steel sheet pile joint leakage and the problem of difficulty in leaking stoppage are solved, and the normal function of the steel sheet pile under the long-term working condition can be guaranteed.

The invention belongs to the technical field of building construction, and provides a bank protection pile foundation construction optimization method based on steel sheet pile sinking parameter feedback, which comprises the following steps of: evaluating a pile sinking state in real time according to hammering force data, acceleration data and perpendicularity data through a steel sheet pile sinking numerical model; a corresponding construction optimization decision is made in combination with the actual condition of the project; the real-time hammering force data, the acceleration data and the perpendicularity data are compared with corresponding preset parameter thresholds, and an optimization decision instruction is sent out; the optimization decision instruction is sent to piling equipment, and optimization measures are executed; the optimized pile sinking parameters are continuously monitored, the actual data average value of all the optimized parameters is compared with the preset ideal pile sinking state, the construction optimization decision is adjusted, and a closed-loop feedback optimization mechanism is formed; construction adjustment is conducted through feedback of pile sinking parameters of the steel sheet pile, the construction quality is guaranteed, the construction efficiency is improved, a closed-loop feedback mechanism is formed, and continuous optimization is achieved.

The invention belongs to the technical field of water transportation engineering static pressure pile planting machines, and particularly relates to a fixing clamp for a cold-bending Z-shaped steel sheet pile static pressure pile planting machine. The Z-shaped steel plate is arranged at the bottom of the pile planting machine body; the clamping assembly comprises a movable clamp, a fixed clamp, a pushing assembly and a deflection assembly, the movable clamp and the fixed clamp are distributed front and back and located at the bottom of the pile planting machine body, and the pushing assembly is connected with the movable clamp and used for driving the movable clamp to move; the deflection assemblies are arranged on the opposite sides of the movable clamp and the fixed clamp respectively. According to the U-shaped static pressure pile planting machine steel sheet pile fixing clamp, the U-shaped static pressure pile planting machine steel sheet pile fixing clamp is improved, the fixing clamp is changed into a structure with a notch, the fixing clamp can clamp the locking opening position of a cold-bending Z-shaped steel sheet, and therefore under the condition that clamping force is not lost, the stability of the fixing clamp when the fixing clamp clamps the Z-shaped steel sheet is guaranteed.

The invention discloses a deep foundation pit supporting system in a silt soft soil layer environment and a construction method. The construction method comprises the following steps that construction preparation is conducted; construction scheme design and feasibility evaluation: compiling a construction scheme, and evaluating whether the stability of the deep foundation pit supporting system meets the requirement or not; design and construction of silt soft soil support reinforcement: designing a structure for supporting and reinforcing silt soft soil, and constructing a steel sheet pile enclosure wall, an out-pit cement mixing pile enclosure wall and an in-pit cement mixing pile enclosure wall; earth excavation and inner support construction in the foundation pit are conducted, specifically, earth excavation is conducted, and a steel pipe inner support is adopted for supporting; and in-pit construction and supporting system conversion, bottom sealing concrete is poured at the pit bottom of the deep foundation pit, bearing platform pouring is carried out on the bottom sealing concrete, and in the pouring process, a steel pipe inner support is dismantled. According to the method, the rigidity of a deep foundation pit supporting system can be effectively enhanced, underground water permeation is prevented, and the weight of a foundation pit bottom sealing component is increased so as to prevent the foundation pit bottom silt soft soil body from upheaval and water burst accidents.

The utility model discloses a steel-concrete combined hanging box wall plate water stopping and slab staggering preventing connecting structure which comprises a plurality of pairs of C-shaped pieces and a plurality of I-shaped pieces, each pair of C-shaped pieces is fixedly installed on a hanging box wall plate used for being matched with the connecting structure for use, and each hanging box wall plate comprises a plurality of sections of steel plate piles which are sequentially arranged; the steel sheet pile comprises a first steel sheet pile section, a middle steel sheet pile section and a tail steel sheet pile section, a connecting cavity is formed between the first steel sheet pile section and the tail steel sheet pile section, all pairs of C-shaped pieces are arranged in the diameter direction of the hanging box, and the two C-shaped pieces in the same pair are installed on the first steel sheet pile section and the tail steel sheet pile section correspondingly; openings of the C-shaped pieces are formed in the sides close to each other, and the I-shaped pieces are inserted into the two C-shaped pieces in the same pair at the same time through the openings of the two C-shaped pieces. The water stop structure has a good water stop effect on the wall plate connecting section.

The invention provides an intersecting shield interval protection construction method, which belongs to the technical field of building construction, and comprises the following steps: firstly, excavating an open cut foundation pit at an intersection, arranging a cast-in-situ bored pile and a crown beam as an enclosure structure in the foundation pit, and arranging a steel support system at the same time. And after the enclosure structure is completed, the foundation pit is excavated to the designed depth, and reinforced concrete supporting piles and pile top beams are constructed. And on the basis, a reinforced concrete protection plate is poured to form a sheet pile structure type protection structure system. And finally, foundation pit filling is completed in a backfilling mode. Before the shield passes through the cross point, a test section is arranged to collect related construction data, and preparation is made for subsequent formal tunneling. And in the actual shield tunneling process, the tunneling speed and the soil bin pressure are controlled, and synchronous grouting is conducted. And after crossing the cross point, arranging closed rings in the front and back areas, and carrying out wall back grouting by adopting double-liquid slurry. And finally, a geological radar is used for detecting the cavity and repairing, and the problem of mutual influence in up-down close-distance crossed tunnel construction is solved.

Examples include a pile cutting apparatus including a cutting device for cutting a sheet pile, with a front pile bearing surface, a rear pile bearing surface, and a cutting gap arranged therebetween. A table plane contains the front pile bearing surface. The cutting device further includes a movable upper blade, a lower blade including a cutting edge, and a cutting aid for fixing sheet piles that is upstream from the upper blade along a transport path for transporting sheet piles. A movable support element has a contact surface for supporting sheets and is movable between a support position and a disposal position. The contact surface, when the support element is arranged in the support position, is arranged in and / or beneath the table plane, and is closer to the cutting edge when the support element is in the support position than when the support element is in the disposal position.

The invention discloses a drainage and prevention combined type embankment structure and a construction method, and belongs to the technical field of water conservancy projects. The embankment structure comprises a base and a protection structure arranged on the base in a coherent mode, the protection structure is composed of main pipe piles and arc-shaped sheet piles which are arranged at intervals, and an embankment is divided into a backwater side and a waterside. Side edge and top consolidation bodies are formed at the bottoms of the main pipe piles through grouting of the auxiliary pipe piles and the miniature pipes so as to enhance bearing; the arc-shaped sheet piles are tightly connected with the main pipe piles through the connecting end plates, the cap beams, the locking opening pipes and the connecting bolts, and a sealing anti-seepage system is formed on the backwater side. Meanwhile, a water collecting and draining system is arranged in the main pipe pile, and water on the water facing side is allowed to be drained orderly through the water collecting holes, the graded gravel materials, the water collecting pipe and the drainage blind pipe. Through combination of'prevention 'and'drainage', the anti-seepage safety of the backwater side is ensured, seepage water is timely dredged to eliminate seepage pressure, damage to the structure caused by water pressure accumulation is avoided, and unification of stability and safety of the embankment structure is achieved.

The invention relates to a foundation pit supporting method based on combination of steel sheet piles and tubular piles, which comprises the following steps of: firstly, excavating a foundation trench at the periphery of a foundation pit, vertically driving the steel sheet piles into the foundation trench to form a continuous supporting wall body, and realizing a closed joint through lock catch occlusion; the top of the prestressed concrete pipe pile is lower than the steel sheet pile; welding the pipe piles and the steel sheet piles by adopting H-shaped steel connecting pieces, wherein the welding length is greater than or equal to 1.5 times of the section height of the section steel; cement grout with the volume 1.8-2.2 times that of the pipe pile is injected within 24 hours after the pipe pile is installed; the section width of the locking beams is 1.2-1.5 times that of the flanges of the steel sheet piles, and the steel bars are in lap joint with the reserved steel bars of the steel sheet piles; and finally, a horizontal steel support comprising a pressure sensor and an electric jack is installed, and the axial force is dynamically adjusted through displacement monitoring. According to the method, the rigidity of a supporting system is remarkably improved through cooperative stress of the combined structure, the method is suitable for deep foundation pit engineering in the soft soil area, deformation can be effectively controlled, and automatic monitoring and adjusting are achieved.

Disclosed in the present invention is a pile foundation construction method, comprising the following steps: S1, on the basis of the designed positions of pile foundations on a slope, and along two sides of pile positions within a straight line range from the top to the bottom of the slope, marking positions at which steel sheet piles need to be installed; S2, fixing a winch device at the top of the slope, installing a first movable platform and connecting same to the winch device to complete a full-section steel trestle; S3, placing a drilling device on the first movable platform, and using the winch device to enable the first movable platform to travel on the steel trestle to a planned position, fixing the first movable platform on the steel trestle, and then using the drilling device to perform pile hole construction at the pile positions; S4, repeating S3 until all pile holes in an area covered by the steel trestle are drilled, and subsequently detaching the drilling device from the first movable platform; S5, a hoisting device moving or traveling onto the first movable platform, and hoisting pile reinforcement cages into all the pile holes; and S6, pouring concrete into the pile holes. The present invention has the beneficial effect of facilitating pile foundation construction on mountainous slopes.

The invention relates to the technical field of supporting devices, and discloses a combined flexible self-balancing foundation pit supporting device which comprises two constructional columns pre-buried at the corner of a foundation pit, a plurality of mutually spliced steel sheet piles are installed between the two constructional columns, I-shaped steel is further fixedly installed between the two constructional columns, and the I-shaped steel is fixedly connected with the constructional columns. The I-shaped steel is installed on the side, away from the wall of the foundation pit, of the steel sheet pile, and a plurality of anchor rods penetrating into the wall of the foundation pit are inserted into the outer surface of the I-shaped steel in a penetrating mode. Through the traction effect of a plurality of steel cables, a connecting plate can drive a winding shaft to rotate, a plurality of transmission gears are installed on the outer surface of the winding shaft, the transmission gears are meshed with a transmission rack, so that a push plate is pushed to move towards a steel sheet pile, and the push plate exerts force through the steel sheet pile inclining outwards to help push the steel sheet pile back to the wall of a foundation pit. Therefore, the collapsed pit wall is effectively supported, the effect that the steel sheet piles support the pit wall of the foundation pit in a balanced mode is achieved, and the supporting capacity of the foundation pit is improved.

The invention discloses an ecological pile steel formwork system and a construction method thereof. The ecological pile steel formwork system comprises a foundation module, a base, a pile body end plate and a pile head end plate. The basic module comprises a bottom die, a side die and a hinge, the bottom die and the side die are connected through the hinge, and a convex template is arranged on the bottom die; the base comprises a square steel tube, single-spliced channel steel and double-spliced channel steel, and the square steel tube, the single-spliced channel steel and the double-spliced channel steel are connected through welding; the pile body end plate comprises at least one of a steel template with a pile tip and a steel template without the pile tip; the pile head end plate comprises a pile head steel template and an ecological hole steel template, and the ecological hole steel template is arranged on the pile head steel template; wherein the basic module and the base are fixed through welding; the foundation module, the pile body end plates and the pile head end plates are transversely connected through U-shaped bolts; lower hanging steel plates are arranged on the lower portion of the pile body end plate and the lower portion of the pile head end plate and inserted into the double-spliced channel steel of the base to be positioned. The device is simple in structure and convenient to mount and dismount.

The invention discloses a novel foundation pit support system construction method which is applied to the field of foundation pit excavation and support of traffic civil engineering. According to the method, Larsen IV type steel sheet piles, reinforced concrete structure rigid frame beams and phi 630 * 8 steel pipe piles are adopted to form an enclosure system, and the enclosure system is jointly stressed through connection of the rigid frame beams and anchor pulling steel bars. The construction method comprises the construction steps of inserting and driving the steel sheet piles and the steel pipe piles, constructing reinforced concrete of the top beams and the rigid frame beams and constructing anchor pulling steel bars. The method solves the problems that traditional construction is limited by factors such as sites and traffic, the construction space in the foundation pit is limited, and the construction period is long, the advantages of all components are played, excavation safety and stability are improved, use of supports in the foundation pit is reduced, construction efficiency is improved, the construction period is shortened, and remarkable economic benefits are achieved.

The invention discloses an in-situ solidification construction method for a highway shallow foundation in a water-rich section of a permafrost region. The in-situ solidification construction method comprises the following steps: step 1, preparation at the early stage of construction; secondly, steel sheet pile enclosure water insulation is conducted; thirdly, in-situ soil solidification construction is conducted; fourthly, dynamic compaction encryption treatment is conducted; step 5, quality detection and molding acceptance inspection; and step 6, subsequent environmental protection and safety guarantee. Three dimensions of a steel sheet pile waterproof technology, a high-weather-resistance composite curing material in-situ curing technology and a dynamic compaction technology are integrated, and a set of systematized and standardized construction scheme is formed. According to the multi-dimensional combined method, the foundation treatment effect is improved, the comprehensiveness and pertinence of construction are enhanced, and a more effective solution is provided for road foundation treatment in the water-rich section of the permafrost region.

The invention relates to the technical field of steel sheet pile cofferdams, in particular to a deep and long steel sheet pile cofferdam structure which comprises two steel pipe sets symmetrically distributed front and back, each steel pipe set is composed of a plurality of steel pipes linearly and evenly distributed, and a steel sheet pile is jointly connected between every two adjacent steel pipes. The deep and long steel sheet pile cofferdam structure further comprises a plurality of supporting mechanisms, and the supporting mechanisms are evenly distributed on the front sides and the rear sides of the two steel pipe sets. The sealing limiting parts and the supporting parts are alternately distributed and connected with each other, so that the multiple sealing limiting parts and the multiple supporting parts form a whole, two gaps with the same structure and adjacent positions are mutually complemented, force transmission can be conducted between the multiple sealing limiting parts and the multiple supporting parts, stress is uniform, and the sealing effect is good. And therefore, the overall supporting and limiting strength of the multiple sealing and limiting parts and the multiple supporting parts on the multiple steel pipes and the multiple steel sheet piles is improved, and the phenomenon that the single section of the cofferdam deforms is avoided.

The invention belongs to the technical field of foundation pit construction, and particularly relates to a foundation pit supporting structure and a construction method thereof.The foundation pit supporting structure comprises a plurality of steel pipe piles arranged in the circumferential direction of a foundation pit at intervals, first lock catches are fixed to the outer sides of the steel pipe piles, Larsen steel sheet piles are arranged between the steel pipe piles, and second lock catches are fixed to the two sides of each Larsen steel sheet pile; the adjacent steel pipe piles and Larsen steel sheet piles are connected in a clamped mode through corresponding first lock catches and second lock catches, surrounding purlins are fixed to the inner sides of the multiple steel pipe piles, and concrete supporting pieces are arranged between the surrounding purlins and the corresponding Larsen steel sheet piles. The steel pipe piles are matched with the Larsen steel sheet piles, so that the rigidity of a supporting system is guaranteed while rapid supporting is guaranteed, and less garbage is generated after dismantling.

The invention relates to an active unloading sheet pile revetment reinforcement design method and structure, and belongs to the technical field of revetment reinforcement. Channel parameters and soil mechanical characteristics are measured, design reinforcement piles with the same height as original pile foundations are arranged on the back edge of a revetment, and a pile spacing calculation formula is established based on the soil arching effect; the load sharing ratio of the reinforcing pile is controlled and designed by adjusting the pile diameter; the reinforcing structure designed through the method comprises prestressed sheet piles, a bearing platform, designed reinforcing piles, a gravity type retaining wall, a slope protection surface layer, a concrete coping, an original mud surface line and a designed mud surface line, the pile diameter and the pile distance of the designed reinforcing piles are dynamically adjusted according to the dredging depth, and the thicker a dredging soil layer is, the larger the soil pressure is, the larger the pile diameter is, and the denser the distance is. An original revetment upper structure does not need to be dismantled, the construction period is greatly shortened, and resource waste is reduced; the front line of the revetment does not move forwards, and use of an existing navigable water area is not affected; the construction mode is flexible, land dry land or water construction can be selected according to surrounding conditions, the construction period is short, the speed is high, and the construction cost is low.

The invention discloses an anti-clogging rapid laying construction method for municipal drainage pipelines in a pluvial area, and relates to the technical field of municipal engineering. According to the method, through construction early-stage investigation and pretreatment, a high-pressure jet grouting pile and a steel sheet pile are combined to form a water interception curtain and vacuum well point dewatering is adopted, and a pipeline with a nanometer hydrophobic coating and a flow guide protruding edge is prefabricated; during rapid excavation, rapid hardening concrete is used for supporting, and a prefabricated module foundation with a permeable blind pipe is laid; laser positioning is adopted for hoisting, and double sealing is adopted for interfaces; graded gravel and a curing agent are used for backfilling, and ground penetrating radar is matched for detection; acceptance inspection is combined with a closed water test and an endoscope, and an intelligent monitoring device is installed to be connected into an intelligent system. The problems that construction efficiency is low and pipelines are prone to clogging in rainy areas are solved, the construction period is shortened by 30% or above, the initial clogging rate is reduced by 60%, and the method is suitable for drainage projects in areas with the annual precipitation being 800 mm or above.

The invention belongs to the technical field of bridge foundation construction fences and pier collision prevention, and particularly relates to a steel sheet pile and double-wall steel hanging box combined cofferdam and a construction method. A steel sheet pile and double-wall steel hanging box combined cofferdam comprises a double-wall steel boxed cofferdam, a steel sheet pile cofferdam and a pile foundation, the double-wall steel boxed cofferdam is installed above the pile foundation and comprises a steel boxed cofferdam bottom plate, a steel boxed cofferdam wall plate and a wall plate top reinforcing truss, bottom sealing concrete is arranged on the upper portion of the steel boxed cofferdam bottom plate, and the steel boxed cofferdam bottom plate is arranged on the steel boxed cofferdam wall plate. The steel sheet pile cofferdam comprises a Larsen type steel sheet pile, an outer waling, an inner waling and a waling bracket, a connecting device is arranged on the lower portion of the Larsen type steel sheet pile, and the Larsen type steel sheet pile is connected with the upper portion of the steel jacket box cofferdam wall plate through the connecting device. The steel sheet pile cofferdam and the double-wall steel jacket box cofferdam are connected through the connecting device, the steel sheet pile cofferdam serves as a water retaining structure and can be recycled and reused, the one-time steel investment of the double-wall steel cofferdam is reduced, and the construction cost of the cofferdam is greatly reduced.

The invention relates to the technical field of offshore construction, in particular to an inclined shallow covering layer batholith seabed steel cofferdam inner support conversion construction method which comprises the steps that S1, steel pipe piles are inserted and driven in a seabed; s2, throwing a sand bag; s3, filling materials; s4, inserting and building a steel cofferdam at the filler; s5, long supports are arranged on the steel cofferdam, and water pumping is conducted; s6, the steel cofferdam is filled with materials, and a concrete cushion layer is constructed; s7, a first-layer bearing platform is constructed, after the strength reaches the standard, a first short support is arranged between the first-layer bearing platform and the steel cofferdam, and then a long support is dismantled; s8, a second-layer bearing platform is constructed, after the strength reaches the standard and anti-corrosion construction is conducted, a second short support is arranged between the second-layer bearing platform and the steel cofferdam, and then the first short support is dismantled; s9, anti-corrosion construction is conducted on the first layer of bearing platform; s10, the steel cofferdam and the inner supporting system are dismantled, and the seabed is cleared. According to the construction method, the loss of steel materials can be reduced, the occupied construction space is reduced, and the problem that cofferdam steel sheet piles are difficult to drive in is solved.

The invention discloses a prestressed concrete H-shaped sheet pile and a construction method, and relates to the technical field of hydraulic engineering, the prestressed concrete H-shaped sheet pile comprises an H-shaped sheet pile body integrally formed by two flanges and a web plate, and further comprises prestressed steel bars arranged in the flanges and the web plate in the length direction of the sheet pile body, and the two ends of the sheet pile body are fixedly connected with reinforcing end covers. One face of the reinforcing end cover is connected with the prestressed steel bars, the other face of the reinforcing end cover is symmetrically provided with U-shaped inserting frames and inserting plates connected with the two U-shaped inserting frames, drainage grooves are formed in the two sides of the web, and river side drainage holes and shore side drainage holes communicated with the drainage grooves are formed in the two flanges respectively. U-shaped reinforcing ribs which are vertically distributed are arranged at the joints of the web and the flanges. By means of the prestressed reinforcement network arranged in the flanges and the web and the connection supporting structure of the U-shaped reinforcing ribs with the inclined top faces, the flanges on the shore side are more stable than the flanges on the other side, and the flexural capacity of the sheet pile is improved.

The utility model provides a deep foundation pit supporting structure, which relates to the technical field of foundation pit supporting and comprises an external Larsen steel sheet pile and a steel enclosing purlin positioned on the inner side of the Larsen steel sheet pile, and the inner side of the steel enclosing purlin is connected with a steel supporting piece through a steel cushion box; a plurality of layers of steel enclosing purlins are horizontally arranged, each layer of steel enclosing purlins is connected with a layer of steel supporting pieces, four sets of steel supporting pieces are arranged on each layer of steel enclosing purlins, and a set of steel supporting pieces is connected between the steel enclosing purlins on the inner sides of every two adjacent Larsen steel sheet piles. Each set of steel supporting pieces comprises at least two steel supporting pieces, each set of steel supporting pieces comprises a long support and a plurality of short supports, and the long supports and the short supports of each set of steel supporting pieces are arranged in parallel. The utility model has the beneficial effects of reasonable design, simple structure, safety and reliability, and can provide reliable support for different soil layers, improve the supporting effect and reduce the construction difficulty and cost.