154results about How to "Increase prestress" patented technology

An articulated anchor and a prestress tensioning method of high strength fibre composite sheet relate to an anchor holder used to perform prestress tensioning to the high strength fibre composite material of the enhancement or reinforcement engineering structure and a method thereof. The articulated anchor of the invention comprises an anchor head and a compression and locking device, and the articulated anchor is characterized in that the anchor head contains a raised head anchor and a concave block. The method of the invention is that the articulated anchor is used to clamp and anchor the two ends of FRP sheet, a jack is used to apply a tension on the concave block and the concave block pushes the raised head anchor to perform prestress tensioning to FRP sheet. The articulated anchor of the invention has simple structure, convenient installation and low cost; and the method of the invention is simple, intuitive and practical, and can ensure the tensioning uniformity of FRP sheet, made full use of the intensity of FRP sheet and effectively increase the bearing capacity of the engineering structure. The articulated anchor of the invention can be widely used to enhance or reinforce the large engineering structures such as bridges or buildings and especially to perform external prestressing reinforcement to longspan concrete beams, longspan concrete slabs and the like.

The invention provides a method for preventing and treating roof falling and side collapsing of coal roadway surrounding rock by an anchor rope truss, which belongs to the field of mineral engineering or civil engineering, and mainly solves the problem of roof falling and side collapsing accidents of the coal roadway surrounding rock. In the method, a plurality of groups of top late monomer anchor ropes and top plate truss anchor ropes are arranged on the top plate of the coal roadway at intervals so as to support and protect the top plate of the coal roadway; and a plurality of groups of side monomer anchor ropes and side truss anchor ropes are arranged on the roadway side so as to support and protect the roadway side; the whole design takes full advantage of being flexible construction, occupying less sections, costing short construction time, having excellent safety and reliability, saving money, applying strong pre-stress and the like of the anchor ropes, the top plate truss anchor ropes can penetrate into a maximum shear stress region at the top of the coal roadway to form very strong pre-stress, and the side truss anchor ropes can penetrate into the deep part of the roadway side and can be fixed by a channel steel to form very strong pre-stress, so that the method is more advantageous, particularly, in strengthening the damaged coal roadway in comparison with other methods.

The invention provides a method for soft rock roadway grouting and full-length prestress baseboard anchor cable comprehensive support. The method comprises the following steps: fixing one end of a prestress anchor cable in deep surrounding rock at a roadway baseboard by a grouting method; initially stretching so that the stretched anchor cable has a certain prestress; drilling and then carrying out high-pressure grouting within a full-length range; and after slurry is solidified, stretching the combined anchor cable once again into a design anchoring strength. The construction method can ensure the anchor cable has higher prestress within the full-length range, achieve active support of the anchor cable on a broken rock stratum, and effectively control deformation of the roadway baseboard.

A prescribed prestressing process is employed to construct precast concrete beams and girders. The process is utilized where an early concrete strength is too low for transfer of the full pre-tensioning force on a daily schedule to avert an otherwise serious and costly production delay. The process described provides the producer a reliable way of making beams and girders that are prestressed to take advantage of the higher concrete strength characteristics. The consequent economic advantage of higher structural capacity beams and girders is thereby realized. Additionally, beam or girder camber is controlled by the process, fostering production of a superior quality product.

The invention discloses a bamboo bridge deck, which comprises prestressed ribs and a plurality of superposed bridge deck sheets, wherein the prestressed ribs penetrate through the bridge deck sheets; two ends of the prestressed ribs penetrate through shim plates and are fixed and tightened by using anchorage devices to constrain the bridge deck sheets; and each bridge deck sheet is formed by sequentially joggling a plurality of single bridge decks made of bamboo veneers end to end, and the joggled parts of the two adjacent bridge deck sheets are staggered. The required width of the bridge deck is achieved in the transverse direction by the method for sequentially joggling the single bridge decks end to end in the cross section width of a bridge. The basic single decks of the bamboo bridge deck can be conveniently prefabricated in a factory and assembled on site to form the bamboo bridge deck; the construction process is simple and fast, and the construction materials are environment-friendly and are easily reclaimed; and the bamboo bridge deck is suitable for a combined structural bridge, and is a bridge deck capable of meeting the using functions and the durability.

A large-deformation broken surrounding rock roadway management method includes forming deep grouting holes in a deformed roadway for grouting, after deep grouting is completed, performing construction on the deformed roadway, removing deformed parts of the top, side and bottom of the deformed roadway, recovering an original design section of the roadway, supporting the whole roadway section intensively, then forming shallow grouting holes in the top and sides of recovered original design section at equal intervals, performing secondary grouting, grouting the shallow grouting holes through grouting anchors to glue grout and roadway surrounding rocks stably, and completing recovery of the deformed roadway. The existing broken roadway supporting technology, roadway surrounding rock reinforcing theory and prestress technology are combined, on the basis of improving the stress state of the roadway surrounding rock, the technical manners of surrounding rock deep grouting, high-strength anchor intensive anchoring and wall back filling are adopted, a compound support structure is formed between the roadway broken surrounding rock and the roadway support, mechanical characteristics of the surrounding rock are optimized effectively, bearing capacity of the surrounding rock is improved, and stability of the roadway section is guaranteed.

The invention discloses a tensioning and anchoring device for prestressed fiber cloth reinforced beams and a construction method of the device. The device comprises fixed supports, a fixed end anchorage device, a tensioning end anchorage device, clamping pieces, short anchoring screws, long anchoring screws, chemical bolts, fiber cloth, a prestress application frame and a jack, wherein the fixed supports, the fixed end anchorage device and the tensioning end anchorage device are cuboid; the fixed supports are fixed with a to-be-reinforced beam through the chemical bolts; the fixed end anchorage device and the tensioning end anchorage device are connected with the fixed supports through the short anchoring screws and the long anchoring screws respectively; a rectangular through seam allowing the fiber cloth to pass is formed in the fixed end anchorage device; wedge-shaped holes allowing insertion of the clamping pieces are formed in the tensioning end anchorage device, and the clampingpieces are wedged into the wedge-shaped holes, so that clamping of the fiber cloth is realized. The construction method comprises steps as follows: firstly, the anchorage devices are mounted, then thefixed supports are assembled and the anchorage devices are fixed, finally, the prestress application frame and the jack are mounted, and tensioning and anchoring are implemented. The device is reasonable and simple in structure and convenient to operate and can be reused, and the applied prestress is large.

Method for applying a reinforced composite material, such as a fibre reinforced polymer (FRP) laminate or a steel reinforced polymer (SRP) laminate or a steel reinforced grout (SRG) composite, to a structural member. The method comprises the steps of: applying a curable adhesive to a surface of the structural member and/or a surface of the reinforced composite material, and bringing said surfaces into contact. A pre-stressing force, P_max, is directly or indirectly applied to the reinforced composite material. The pre-stressing force, P_max, to which a treatment length, L_T, of the reinforced composite material is subjected is then decreased so that the reinforced composite material along the treatment length, L_T, will be less pre-stressed than the reinforced composite material adjacent to the treatment length, L_T, when the adhesive has cured.

The invention relates to a construction method of a pile foundation anchor rope prestress high retaining wall. A coping section is arranged on the upper part of a cantilever board, the bottom of the cantilever board is provided with a bottom board; a tubular pile is embedded into the bottom board; a bracing piece is arranged behind the cantilever board and is fixedly arranged on the upper part of the bottom board; the bracing piece is connected with the cantilever board and the bottom board through a fixed end; an anchor rope penetrates through the cantilever board, the bottom board and the inner side of the tubular pile through the fixed end; the coping section and the bottom board are of a reinforced concrete structure; the top of the coping section is provided with a fixing end; the upper part of the bottom board is provided with a fixing end; an anchor rope preformed hole is pre-arranged for connecting a prestress anchor rope to form the pile foundation anchor rope prestress high retaining wall. The technology has favorable technical economic benefit.

The invention relates to a prestressed steel box concrete combination continuous beam bridge structure. The structure comprises bridge piers, main beams and a concrete bridge face; the bridge piers are connected with the main beams through bridge pier supports; the main beams are arranged between the adjacent bridge piers and are connected with the adjacent main beams through concrete and steel cables; the concrete bridge face is laid on the main beams; the main beams comprise a plurality of steel main beams which are arranged in parallel; the parallel steel main beams are connected through a plurality of steel cross beams perpendicular to the steel main beams; each steel main beam comprises a steel box structure, a steel web plate and a steel bottom plate; the steel bottom plates are connected with the steel box structures through the steel web plates; the lower ends of the steel box structures are connected with the bridge piers through the bridge pier supports; the upper ends of the steel box structures are connected with the concrete bridge face; the overall height of the steel main beams is smoothly decreased in a quadratic parabolic curve mode from the position above the bridge piers to the midspan. Compared with the prior art, the structure has the advantages of being large in rigidity, reasonable in structure, easy to construct, easy to maintain and the like.

The invention relates to a split Hopkinson pressure bar provided with an energy absorbing device and capable of simulating an in-situ stress environment. A horizontal experimental platform is sequentially provided with a gas tank, an emitting cylinder, an impact bar, an incident end baffle, an incident bar, a confining pressure loading system, a transmission bar, a front-end energy absorbing bar,the shaft pressure loading and front-end energy absorbing device, a transmission end baffle, a connection bar, a rear-end energy absorbing bar, a cushioning pad layer and an energy absorbing baffle; the incident bar, the transmission bar and the rear-end energy absorbing bar are supported by a support, and the support and the horizontal experimental platform are fixed through bolts; the gas tank is mounted on the horizontal experimental platform through the bolts and connected with the emitting cylinder; and the incident end baffle, the confining pressure loading system, the transmission end baffle and the energy absorbing baffle are directly fixed to the horizontal experimental platform through bolts. According to the split Hopkinson pressure bar, the force bearing state of deep high-stress rock can be reflected more realistically, and meanwhile, through the design of an energy absorbing system, the stability of a dynamic testing system under the high stress and the high loading rateis ensured.

The invention provides a preparation method of a fiber reinforced polymer sheet, and relates to a manufacturing method of the fiber reinforced polymer sheet used for enhancing and reinforcing an engineering structure. The preparation method comprises the following steps of: preparing a mixed fiber cloth; performing local reinforcement on two ends; and obtaining a finished product by a process of folding the mixed fiber cloth and prefabricating the two ends into waveform. The fiber reinforced polymer (FRP) sheet prepared by the method is small in width, is easy to be clamped and anchored by a wave-shaped-gear grip anchor, can bring the ultimate strength into full play, can significantly improve the reinforcement effect of the engineering structure, and is simple in manufacturing process, convenient in construction and low in cost. The method provided by the invention has the characteristics of flexible preparation mode, simple process, less production equipment, low cost and the like. The FRP sheet prepared by the method is widely used for enhancing and reinforcing newly-built or built engineering structures, and is particularly suitable to be used as a prestressed material to reinforce bridges or building constructions, and used as a stay cable, a suspension rod and the like for manufacturing bridges.

The invention relates to a hydraulic coupling anchor bolt which structurally comprises an anchor end, an anchor bolt body, a piston, a hydraulic cylinder, a tray, a nut, a liquid injection pipe and other parts. According to the hydraulic coupling anchor bolt and a monitoring system thereof, an anchor bolt which is used for supporting an underground roadway or actively reinforcing a slope, a tunnel and a dam body in a project technology is particularly applicable to the supporting of the roadway with a more complete top plate. According to the hydraulic coupling anchor bolt, the pressure of the anchor bolt can be relieved through a hydraulic device, so that the anchor bolt is not sheared, damaged and ineffective due to large pulling force; and meanwhile, the purpose of reinforcing the liquid injection of the hydraulic cylinder of the anchor bolt can be achieved, and finally the supporting and flexible supporting are enhanced. The tail part of the hydraulic coupling anchor bolt is provided with the hydraulic device, so that the deformation and the stress of the wall rock of the roadway are automatically adjusted.

The invention discloses a method and a device for producing a prestressed concrete cylinder pipe by surfactant, and belongs to the technical field of the method and the device for producing the prestressed concrete cylinder pipe. An annular prestressed high-strength steel wire is wound on a cylindrical thin steel plate tube at the outer surface of a pipe core. The method is characterized by also comprising the following steps of: spraying a layer of surfactant of which the thickness is 1.5-2.5mm on the surface after winding the annular prestressed high-strength steel wire on the cylindrical thin steel plate tube at the outer surface of the pipe core; processing the interface bonded between a metallic material and a non-metallic material, and then spraying a dry hard cement mortar protection layer by a roll injection machine. According to the method, the adhesive bonding performance between the surface of a thin steel tube of the pipe core, the surface of the annular prestressed high-strength steel wire and the cement mortar protection layer is enhanced by processing the interface between the metallic material and the non-metallic material; the protection effect of the cement mortar protection layer is enhanced, and the durability and the service life of the prestressed concrete cylinder pipe are improved. The device can finish the method.

The invention provides a slope reinforcement device used for municipal construction engineering. The slope reinforcement device used for municipal construction engineering comprises a concrete frame protective plate and a protective layer, wherein the concrete frame protective plate is arranged on a slope. A plurality of hollowed-out areas are formed in the protective plate and used for planting green plants. The protective layer is a non-woven fabric protective layer and is arranged on the surface of the protective plate. The protective plate is fixed to the slope through an anchor rod. The anchor rod comprises an anchor ribbed rod body, a reinforcement rod head and a plurality of force hook heads, wherein the top end of the anchor ribbed rod body is fixedly connected with the reinforcement rod head, and the force hook heads are welded to the two sides of the reinforcement rod head correspondingly; and the anchor ribbed rod body is made of a steel stranded wire. According to the slope reinforcement device used for municipal construction engineering, the structure of the anchor rod is optimized, and thus the anchor rod is more suitable for shallow fixing. The force hook heads are obliquely welded to the reinforcement rod head, welded to the two sides of the reinforcement rod head in opposite directions correspondingly and obliquely arranged at the inclination angle of 30-45 degrees so that the prestress force applied to the anchor ribbed rod body can be increased easily, the force hook heads can be hooked in the slope more powerfully, and excellent pulling resistance is achieved.

The invention belongs to the technical field of ocean engineering, and discloses a multi-point mooring structure suitable for an offshore floating fan and an offshore wind driven generator, wherein the multi-point mooring structure comprises a fan platform and a plurality of groups of mooring lines, one end of each group of mooring lines is connected with the fan platform, the other end of each group of mooring lines is connected with an anchoring point, and the anchoring point is arranged on the seabed; the fan platform is cylindrical, and a plurality of groups of mooring lines are uniformlydistributed around the central shaft of the fan platform; the fan platform is provided with two rows of guide cable holes, the two rows of guide cable holes are arranged at intervals in the length direction of the fan platform, and the two rows of guide cable holes are arranged in a crossed manner; And one end of each group of mooring lines is respectively connected with the two rows of guide cable holes. The structure can effectively solve the problem of overlarge motion response of the offshore floating fan under the wind wave load, can obviously reduce the rolling motion of the fan, and improves the stability.

The invention relates to a valve arrangement (1) which has a valve unit (2) with an electrodynamic drive device (22). The latter contains an annular permanent magnet unit (22a) and a coil unit (23b) which can be moved in a linear manner relative to the permanent magnet unit, thereby carrying out a drive movement (39), and which has a coil (43) that interacts with the permanent magnet unit (22a). The coil (43) is arranged on a coil support (46) of the drive unit (23b), a column-shaped guide portion (52) of said coil support being immersed into a central guide through-opening (48) of the permanent magnet unit (22a) and said coil support being paired with a closure means (34) which cooperates with a valve seat (33). As a result of the interaction between the guide portion (52) and the permanent magnet unit (22a) in the region of the guide through-opening (48), a linear guide is provided for the coil unit (23b) such that a precise valve function can be ensured with compact dimensions.

The invention relates to a quick presressed anchor rod structure and a construction method. The structure comprises a washer (1), an anchor rod (2), a nut (3), a fixed wall body (4), an expansion groove (5), a rotating steel wire (6) and an anchor head barb (7). The working principle of the structure is as follows: an embedding space is provided to the anchor rod (2) by the expansion groove (5); the rotating steel wire (6) is arranged at the periphery of the anchor rod (2); a higher resistance is generated in the suffering of axial force; and the anchor head barb (7) is arranged at the lower end of the expansion groove (5) of the anchor rod (2) for realizing a highest resistance at the terminal. The construction method comprises the following steps: an electric drill is used for drilling to realize the excavation of the expansion groove (5); the anchor rod (2) is mounted in the expansion groove (5) according to the position; then, the cement grouting is performed for the anchor rod (2); and through the cement grouting, the anchor rod (2) with the rotating steel wire (6) is more completely bonded with the wall body or clay. The washer (1) is arranged at the exposed end of the anchor rod (2); the nut (3) is screwed up to realize the fixation of the anchor rod; and the load can be applied to the anchor rod after the construction for 2 hours.

The invention discloses a pre-stressed anchor cable anchoring terminal device for deep large landslide super long anchoring; the pre-stressed anchor cable anchoring terminal device comprises a structure body (1), embedded poles (2), a cylindrical rod body (3), and a limit ring (4); the structure body is used for connecting and assembling parts in the anchoring terminal; the cylindrical rod body is built in a hole (10) of the structure body; a steel cable (6) penetrates the cylindrical rod body and is fixedly connected with the end of the cylindrical rod body; parallel grooves (9) outside the cylindrical rod body are tightly engaged with sawteeth (8) on the top of the embedded poles; the cylindrical rod body moves downwards to drive the embedded pole to rotate and expand, so the embedded pole can be embedded into tunnel wall surrounding rocks so as to provide anchoring force; the limit ring can limit the maximum expanding level of the embedded pole, so all embedded poles can be expanded in synchronization; the pre-stressed anchor cable anchoring terminal device is clear in principle, simple and smart in structure, can carry out pre-stress tension after installation so as to provide instant anchoring force, so the pre-stress force can be evenly and synchronically taken by a plurality of anchoring terminal devices; the pre-stressed anchor cable anchoring terminal device can satisfy following anchor cable supplemental tension, and is suitable for deep large landslide instant or permanent stable support needing super long anchoring.

The invention provides a high-quality prestressed steel cylinder concrete pipe and a production process thereof. The high-quality prestressed steel cylinder concrete pipe comprises a steel cylinder concrete pip, a bellmouth steel ring and a socket steel ring are correspondingly welded to the left end and the right end of the steel cylinder concrete pipe, and a protective mechanism is connected tothe outer part of the socket steel ring in a buckled mode. According to the high-quality prestressed steel cylinder concrete pipe, the protective mechanism is arranged on the socket steel ring weldedto the right end of the steel cylinder concrete pipe, when the steel cylinder concrete pipe needs to be stored after manufacturing, firstly a first elastic clamping hoop and a second elastic clampinghoop are installed at the socket at the right end of the socket steel ring, then the first elastic clamping hoop and the second elastic clamping hoop are fixed through two fastening mechanisms, the structure is simple, operation is convenient and fast, the working efficiency of the protective mechanism during installation is effectively improved, the protective mechanism is arranged, thus a secondannular groove formed in the socket steel ring can be effectively protected, thus the phenomenon of dust and other impurities adhering to the inner part of the second annular groove is avoided, and the sealing performance of the second annular groove after the installation of a sealing ring is improved.

The invention discloses a tunnel rock burst control type TBM system and method. The tunnel rock burst control type TBM system comprises a cutter head, a telescopic shield, a reinforcing mesh lifter, a steel bracket lifter, a concrete ejector, a movable supporting part, a pipe piece mounting device and an anchoring piece mounting device which are coaxially arranged and are sequentially connected and fixed through transmission pieces from left to right; the cutter head, the concrete ejector, the anchoring piece mounting device and the pipe piece mounting device are rotatably arranged around a central shaft; and the telescopic shield and the reinforcing mesh lifter rotate around the central shaft and stretch out and draw back in the radial direction. The tunnel rock burst control type TBM system is simple in structure, the tunnel rock burst control type TBM system is used for excavating a tunnel and constructing a reinforcing mesh-anchoring piece-high-strength arch frame-pipe piece combined supporting system, the risk of rock burst in the tunnel TBM construction process is reduced or avoided, and the safety of constructors and mechanical equipment is guaranteed.

A torsional vibration damper comprises an outer housing (11), an inner part (12) that is concentric relative to the outer housing (11), a plurality of chambers (13) formed between the outer housing (11) and the inner part (12), which arc filled with a damping medium and are connected to one another through overflow channels (14), and a plurality of leaf spring configurations (16, 17, 16', 17') that are arranged in the chambers (13) and join the outer housing (11) and the inner part (12) with one another in a torsionally flexible manner. The leaf spring configurations (16, 17, 16', 17') have machining-induced deflections. Two leaf springs with substantially similar deflections are each arranged within a chamber (13). The leaf spring pairs may be arranged in a mirror-image array or in parallel to one another. Thus, the manufacturing cost of a torsional vibration damper can be reduced, while its compact outer dimensions can be maintained.

The invention relates to the technical field of bridge construction, in particular to a bridge deepwater pile foundation reinforcing component. The bridge deepwater pile foundation reinforcing component is technically characterized by comprising a locking ring, a fixing ring and anchor rods, wherein the locking ring is formed by splicing two U-shaped blocks, the top face of the fixing ring is connected with two abutting rod sets, the two U-shaped blocks and the two abutting rod sets are arranged in a one-to-one correspondence mode, each abutting rod set comprises two abutting rods distributedat an interval, one end of each abutting rod is hinged to the top face of the fixing ring, elastic pieces are fixedly connected between each U-shaped block and the free ends of the corresponding two abutting rods, the free end of each abutting rod is fixedly provided with an abutting block and a triggering block, the abutting blocks abut against the side wall of the pile foundation, two triggeringrods corresponding to the corresponding two abutting blocks movably penetrate through each U-shaped block, the triggering rods move up and down to abut against the triggering blocks, and each U-shaped block is provided with a driving assembly. The component can play a good role in supporting and fixing the pile foundation, and therefore the overall stability of the pile foundation is improved.

The invention discloses a self-reposition precast concrete beam column joint device with a dark corbel and a variable friction energy dissipation, including a precast concrete column, a precast concrete beam located on one side of the precast concrete column and a variable friction energy dissipator connected the precast concrete column with the precast concrete beam into a whole. A corbel is arranged on the precast concrete column. The lower side of the precast concrete beam is provided with a notch corresponding to the corbel. The variable friction energy dissipator includes a medium friction steel plate with an undulating surface, an external friction steel plate with the undulating surface and an internal friction steel plate connected with the precast concrete beam on an upper part. The self-reposition precast concrete beam column joint device with the dark corbel and the variable friction energy dissipation can consume energy under an earthquake action, eliminate or reduce the residual deformation of precast reinforced concrete structures under the earthquake action and avoid occurred obvious plastic deformation of main structural members such as precast beams and columns.