201results about How to "Guarantee the pile quality" patented technology

The invention discloses a molding device and a molding method for a long spiral extruding rock-entering cast-in-place pile. The molding device comprises a drilling device formed by assembling a drill stem and a drill arranged at the bottom of the drill stem coaxially, a lowering/lifting system, an electric rotating driving mechanism for driving the drilling device to rotate continuously, a slip casting device for grouting casting slip into molded drill holes continuously to form bored piles when the lowering/lifting system lifts the drill stem, a drilling depth/lifting height detecting unit, a pumping flow detecting unit, a controller and a parameter input unit connected with the controller. The molding method includes: 1 setting initial parameters; 2 drilling; 3 further processing after drilling is in place; and 4 lifting the drill and slip-casting simultaneously. The molding device and the molding method are reasonable in design, easy to use and operate, high in automation, easy in molding process, easy in controlling of pile quality, wide in application range and capable of solving a plurality of problems in the existing molding devices and molding methods for the long spiral extruding rock-entering cast-in-place pile.

The invention discloses a construction method of pile foundations of bridge karst caves in a karst area. The construction method comprises the following steps: punching and karst cave treatment are conducted, and punching and karst cave treatment are carried out repeatedly till holes are formed finally; and karst cave treatment specifically comprises the steps of type identification and treating methods, wherein type identification is that before drilling starting, in the process of drilling and in the process of pouring, the types of the karst caves are judged according to the vertical depthand whether fillers exist or not, and the treating methods comprise pretreatment before construction, treatment during drilling and treatment in the process of concrete pouring. The different treatingmethods are adopted for the different karst caves, thus construction of the pile foundations of the karst caves is safer and more effective, and the purposes of accelerating the hole forming progress, ensuring the pile forming quality and saving the construction cost are achieved.

The invention discloses an FRP pipe and thick-wall steel pipe compounding hollow recycled concrete pile which is mainly formed by an FRP pipe, a round reinforcement cage framework, a thick-wall steel pipe and recycled concrete. The round reinforcement cage framework and the thick-wall steel pipe are arranged in the FRP pipe, and the round reinforcement cage framework, the thick-wall steel pipe and the FRP pipe are arranged concentrically. The recycled concrete is poured in annular space between the FRP pipe and the thick-wall steel pipe. The bearing capacity and deformation resisting capacity of the single pile can be greatly improved through the built-in thick-wall steel pipe. The wrapping FRP pipe can effectively prevent a pile body from being corroded, and the durability of the pile body is improved. Meanwhile, the FRP pipe and spiral stirrups are combined to restrain the inner recycled concrete, and the bearing force of the compounding pile is further improved. Waste concrete is fully utilized as recycled aggregate, and application and popularization of the recycled concrete in building foundation engineering are facilitated. In a word, the compounding hollow recycled concrete pile has the advantages of being good in pile forming quality, high in bearing force, good in deformation resisting capacity and durability, small in influence on the environment, high in construction speed and the like.

The invention discloses a bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation construction method for processing a small-area/narrow-range deep mucky soil or soft clay foundation, which is characterized in that: by utilizing the high bearing capacity and pile-bottom concrete reinforced and enlarged ends of bottom-grouting-enlarged small-diameter prestressed tubular piles, the bottom-grouting-enlarged small-diameter prestressed tubular piles effectively reduce diameters of pile bodies of the conventional prestressed tubular piles, reduce the buried depths of the pile bodies, and are arranged in a plane at a proper pile spacing to achieve micro shallow and dense pile group effect and achieve shallow soft field soil composite foundation reinforcement effect. The method has the advantages that: on bottom-grouting-enlarged small-diameter prestressed tubular pile composite foundation, the small-diameter prestressed tubular piles are used to compact the surrounding soil to transfer load, and grouting and reinforcement of pile bottoms are performed to improve the end bearing capacity, so that a shallow pile-based composite foundation is formed. Compared with a normal large-area soft soil foundation composite foundation processing method and a prestressed tubular pile foundation method, the method has the characteristics of simple process, high construction speed, miniature construction equipment, material saving and low cost.

The invention relates to a double-pipeline drill bit for a cast-in-place stiffening core composite pile. The double-pipeline drill bit comprises an opening/closing blade, a core pile molding protective drum, a cutting blade and a hollow drill pipe, wherein the opening/closing blade is hinged to the bottom end of the hollow drill pipe, and is controlled to be opened or closed through a magnet; the core pile molding protective drum is arranged at the bottom of the hollow drill pipe, and is slidingly connected with the hollow drill pipe through a dowel pin; a cutting blade cutting soil body is arranged at the outer side of the core pile molding protective drum, and provides acting force for vertical sliding of the protective drum; the cutting blade is arranged outside the hollow drill pipe; double pipelines are arranged in the hollow drill pipe; a cement slurry nozzle is arranged at the bottom of the hollow drill pipe; the lower end of a cement slurry pipeline is communicated with the cement slurry nozzle, and the upper end is externally connected with a pumping device for injecting cement slurry; and the lower end of a hollow part of the hollow drill pipe is communicated with the opening/closing blade, and the upper end is connected with the pumping device for filling concrete. The drill bit can be applied to a conventional cement mixing pile machine to omit the pile machine customization cost, realizes once molding of the cast-in-place stiffening core composite pile to simplify the pile forming process, and guarantees the coaxiality of a peripheral pile and a core pile to achieve reliable pile forming quality.

The static pressure immersed tube pile constructing process includes the following steps: hoisting the immersed tube with pile tip and setting in place, pressing the immersed tube into ground with one static pressure piling machine while detecting whether to have the pile tip reaching the bearing stratum until reaching the required bearing pressure, and pouring concrete with the concrete pump while lifting the immersed tube gradually until the poured concrete reaches the design elevation. The in-situ high pressure concrete pouring piling process has the features of easy control, concentrated construction jobs, less environment interference, no pollution, high piling quality and low material loss.

The invention relates to a drilling tool for a two-way soil-cement mixed pile. The drilling tool comprises an inner drilling rod, an outer drilling rod, an inner drilling bit and an outer drilling bit, wherein a water gas injection device is arranged at the upper part of the outer drilling rod, a cavity between the outer drilling rod and the inner drilling rod is set as a channel enabling water gas to descend, a water gas injection spray nozzle is arranged in the position of an outer drilling core pipe above a lower layer of mixing blades of the outer drilling head, the water gas injection spray nozzle is provided with a spray pipe which is arranged perpendicular to the outer drilling core pipe, spray ports are arranged at the two ends of the spray pipe, a valve cavity is arranged in the middle of the spray pipe, a floating spherical valve core is arranged in the valve cavity, and the middle of the valve cavity is connected with the outer drilling core pipe through a connecting pipe. When a pile is made of cement flour, the quality problem of the pile formed at the upper part due to low water content in a crust layer on the earth surface can be solved by water injection; when the pile is made of cement grout, the quality problem of the pile formed at the deep part due to the lack of dry curing at the deep part of the file can be solved by gas injection; the full pile length pile quality of the two-way soil-cement mixed pile can be ensured; and simultaneously, the drilling pipe is less prone to pipe blockage and can increase the mixing times of the cement flour or the cement grout which is sprayed out and greatly improve construction efficiency.

The invention discloses a concrete grouting construction method and a device for implementing the same. The device comprise a plurality of tremies of which one ends extend into underwater concrete in a grouting slot; a blanking hopper is arranged at the top end of each tremie; a slag pumping pipe is arranged in the grouting slot; and the bottom end of the slag pumping pipe is positioned at a position which is 1-2 meters away from the surface of the underwater concrete. According to the concrete grouting construction method and the construction device, slurry above the surface of the underwater concrete is pumped through the slag pumping pipe in a concrete pouring process, and concrete is poured in the pumping process, so that the quality of underwater concrete is prevented from being damaged by the slurry above the surface of the underwater concrete, and the piling quality of the underwater concrete is effectively ensured; and the method and the device can be applied to the field of building construction.

The invention relates to a composite anti-sliding pile wall retaining structure suitable for a reservoir bank slope and a construction method. The structure comprises an anti-sliding pile group and a retaining wall; the anti-sliding pile group is vertically arranged between the retaining wall and the reservoir bank slope face and supports the retaining wall, the upper end of the anti-sliding pile group and the bottom end of the retaining wall are fixedly connected, the lower end of the anti-sliding pile group stretches downwards and is embedded in an anti-sliding stratum below a reservoir bank slope sliding band; the anti-sliding pile group is embedded in the anti-sliding stratum below the reservoir bank slope sliding band, the anti-sliding stability needs can be met, the pile top gravity type concrete retaining wall manner is adopted, the lower grouting type anti-sliding pile group and the pile peripheral soil are integrated, and the anti-sliding pile group and the upper gravity type retaining wall are connected to form the composite anti-sliding pile wall. Integrality is good, space effect is optimized structurally, and stress is more reasonable.

The invention discloses a rapid hole-forming construction method for a large-diameter deep hole pile foundation under karst geology. 'Rotary drill and reverse circulation impact drill' combined relaydrilling is performed, a rotary drill rapidly performs drilling construction of a covering layer, and a reverse circulation impact drill is used for relay construction when a karst geological layer isdrilled. The combined construction process gives full play to the advantages of the two kinds of drills under the situations of different geological conditions and hole depths, the advantages are complemented with each other, and the construction efficiency and economic benefits of the large-diameter deep hole pile foundation under the karst geology are improved. Drilling of single drilling equipment is converted into combined drilling of the two different kinds of drilling equipment, the construction progress of the pile foundation is greatly accelerated under the condition of ensuring the hole-forming quality of the pile foundation, meanwhile, environmental friendliness is better achieved, civilized construction is facilitated, input of personnel and mechanical equipment is reduced, andthe good economic benefits are generated.

The invention relates to a double-protective barrel impact pile-forming method at a silt rock soil layer. The method is characterized in that after holes are formed in the silt rock soil layer through impact, steel outer protective barrels are buried inside the holes in a sleeving manner; after the holes are cleaned, steel inner protective barrels are embedded inside the steel outer protective barrels; and after pile bodies inside the steel inner protective barrels are constructed, the steel outer protective barrels are pulled out. According to the double-protective barrel impact pile-forming method, the hole forming difficulty of a mixed soil layer of rock and flow plastic silt can be effectively reduced, the pile forming efficiency is improved, the pile forming quality of pile body concrete and durability of the pile bodies are guaranteed, and the quality problems like diameter shrinkage and collapse of the pile bodies due to the fact that the protective barrels are pulled out are avoided.

Provided is a diameter-variable drill bit of a long-spiral drill. A lip-shaped locating ring which has the role of axial locating and is connected with a hollow runner of the long-spiral drill is arranged at the top of the drill bit. A long-spiral drill pipe is connected with screws through fixing lugs on both sides of the lip-shaped locating ring. The part above the middle of a drill core is a diameter-variable cutting section drill core, and the screw blade of the part becomes gradually bigger in the upward direction. The part below the middle of the drill core is a guiding section drill core, wherein the blade diameter is unchanged. The drill core is provided with the screw blade, the front end of the screw blade is provided with cutting edges, the screw blade of the cutting section is provided with cutting teeth, a drill bit point is arranged at the bottom of the drill bit, the drill bit point is provided with a main cutting tool, and the top of the main cutting tool is connected with the drill core through the fixing lugs on both sides of the lip-shaped locating ring and retaining screws. The diameter-variable drill bit of the long-spiral drill is especially suitable for the construction of lock-joint pile waterproof curtains with pre-guide holes and the construction of other long-spiral piles with pre-guide holes, and effectively solves the problems that the pile-body perpendicularity deviation and the pile position deviation are large in the long-spiral construction.

The invention discloses a strengthening and reinforcing mountain piling construction method for an underground pile foundation cavern. The strengthening and reinforcing mountain piling construction method comprises the steps that (1), advanced drilling is conducted, specifically, the cavern situation of a site is displayed according to survey data of a project, advanced drilling is conducted before pile forming, and the advanced drilling depth should be drilled till the cavern situation below the pile bottom is proven; (2), hole forming is conducted, specifically, a pile hole is formed in thedesign elevation of the pile bottom; (3), deep drilling is conducted, specifically, a miniature steel pipe is drilled to the cavern bottom; (4), mountain piling is conducted, specifically, mountain piling comprises dredging, discharging for stacking and filling, grouting for consolidation and re-inspection; and (5), pile forming is conducted, specifically, the miniature steel pipe penetrates through a filler pile to be driven to the cavern bottom, a made steel reinforcement cage is put into the pile hole, pile body concrete is poured into a pile, and construction is completed. According to thestrengthening and reinforcing mountain piling construction method, the harm of the underground pile foundation cavern can be safely, quickly, economically, thoroughly and effectively treated, the construction safety and the pile forming quality of the project pile are guaranteed, and the bearing capacity and anti-deformation requirements of the structure are met.

The present invention relates to a multithread minor diameter long auger drilling wall forming machine. Said invention adopts portal shaped piledriver side-by-side set at least auger stems, lower end set drill, top connected with spacer, spacer slip connection with portal shaped piledriver, spacer set rotating power unit, auger stem connected with rotating power unit, auger stem being hollow in middle part, connected with concrete delivery pipe, guideway set below the chassis. Said invention solves uneven soil stirring, weak intensity, inefficiency etc shortage.