40results about How to "Low amortized cost" patented technology

The invention discloses a welded combined T-shaped steel column correcting device and method. The correcting device is composed of multiple correcting units which are on the same straight line. Each correcting unit comprises a platform support, two L-shaped clamps and a jack. Each platform support is formed by welding two stand columns and a cross beam. A vertical beam is arranged on the upper surface of each cross beam, wherein each vertical beam is perpendicular to the corresponding cross beam. The two ends of each vertical beam are provided with two rectangular connecting blocks, wherein every two rectangular connecting blocks are parallel with the corresponding cross beam. Each connecting block is uniformly provided with multiple threaded holes. Each L-shaped clamp is integrally formedby a transverse plate and a vertical plate. Each transverse plate is provided with threaded holes matched with the threaded holes in the connecting blocks. Threaded connecting pieces penetrate the threaded holes in the transverse plates and the threaded holes in the connecting blocks, so that the two L-shaped clamps are fixedly connected with the two connecting blocks correspondingly. Each jack is arranged between the corresponding vertical beam and a to-be-corrected welded H-shaped profile steel web plate. A base of each jack tightly jacks the corresponding vertical beam. The stroke end of each jack tightly jacks the corresponding to-be-corrected welded H-shaped profile steel web plate. The welded combined T-shaped steel column correcting device has the advantages of being simple in structure, easy to operate, low in cost, high in efficiency and the like.

A method for monitoring a device (1) for regulating the flow of a gas, comprising a flow conduit (2) and a shutter assembly (3) that defines a restriction (4) in the flow conduit (2). The method comprises the following operations: causing the transit of gas through the flow conduit (2); defining a sequence of time intervals (Z1...Zn) of corresponding durations (t1...tn); during each time interval(Zi), determining a value of density (di) and a value of velocity (Vi) of the gas at the restriction (4); calculating the product of the value of density (di), of the value of velocity (Vi), of the duration (ti) of the time interval (Zi) and of a correction coefficient (ki) to obtain a corresponding value of equivalent wear (ui); for each time interval (Zi), adding all the values of equivalent wear (u1... ui) calculated for the current time interval (Zi) and for the preceding time intervals (Z1...Z(i-1)) to obtain a cumulative value (cui); comparing the cumulative values (cui) with a predefined limit value (cu*), corresponding to a condition of maximum wear allowable for the shutter assembly (3), to obtain an indication of the condition of efficiency of the shutter assembly (3).

The invention discloses a simply supported prefabricated integrally-cast superposed bridge. The prefabricated integrally-cast superposed bridge comprises inverted T-shaped prestressed prefabricated beam parts, cast-in-situ parts and horizontal baffles, and is characterized in that each cast-in-situ part comprises a cast-in-situ plate and a cast-in-situ superposed part at the upper part of the beam part; pretensioned prestressed steel strands are embedded in the upper parts of a web plate and a lower flange of each inverted T-shaped prestressed prefabricated beam part; the horizontal baffles adopt prefabricated plates, and are longitudinally arranged at intervals between the web plates of the adjacent prefabricated beam parts at the two ends of each beam part and positioned above the flanges of the prefabricated beam parts; and the inverted T-shaped prestressed prefabricated beam parts adopt manufacturing moulds commonly used with buildings, and mould plates are good in commonality, convenient to mount and dismount, high in working efficiency and low in amortized cost.

The invention discloses a large-span truss subsection hoisting high-altitude closing measure device and a construction method. The measure device comprises a plurality of bracket units and a support platform; each bracket unit is composed of a U-shaped groove, two support columns and two flange plates I; the support platform is of a rectangular frame structure and is composed of a plurality of stand columns, a cross beam and support columns; each bracket unit is arranged at the top end of the support platform through two adjusting columns and arranged on a cross beam or a connecting beam in the length direction of the support platform; a plurality of flange plates III corresponding to the bracket units are arranged on the upper surface of the cross beam or the connecting beam in the lengthdirection of the top end of the support platform; flange plates II are arranged at the two ends of each adjusting column; the flange plates II at the top ends of the adjusting columns are correspondingly and fixedly connected with the flange plates I at the bottom ends of the supporting columns; and the flange plates II at the bottom ends of the adjusting columns are correspondingly and fixedly connected with flange plates III arranged on the upper surface of the support platform top beam or connecting beam. The device is high in utilization rate, the butt joint precision of truss main pipesis improved, and the safety of the truss unloading construction process is guaranteed.

The invention relates to a prefabricated wall concrete door and window frame and a construction method. In existing prefabricated concrete wall manufacturing, the template is large in amortizing amount, when a laminating plate type concrete wall is manufactured, the wall is poor in integrity, and the strength cannot meets transportation and hoisting requirements. The prefabricated wall concrete door and window frame comprises a prefabricated concrete door and window frame body (1), the prefabricated concrete door and window frame body is a straight strip plate spliced in a square box shape or an integral square box shape, an outward extending tie bar (2) is installed at the outer side of the straight strip plate or at the periphery of the integral square box, and the outward extending tie bar extends into wall bodies (3) of all sides of windows and doors. The construction method is used for the prefabricated wall concrete door and window frame.

The invention provides an electric heating film cured precast beam integral mould. The electric heating film cured precast beam integral mould comprises a baseplate, side plates, flexible corners, a pull rod, a horizontal beam, electric heating films, heat preservation plates and protecting plates, wherein cavities with upper openings are formed in the baseplate and the side plates; the flexible corners are arranged at the joints of the baseplate and the side plates; the baseplate, the side plates, and the flexible corners are connected to form a whole; the side plates at the two sides are connected through the pull rod at the upper openings; vertical ribs which are spaced by certain distance are welded on the side plates and are perpendicular to the side plates; the vertical ribs are in welded connection with the horizontal beam; baseplate stiffening ribs are welded on the baseplate; the electric heating films are pasted on the surfaces of the baseplate and the side plates; and the heat preservation plates and the protecting plates are arranged on the outer sides of the electric heating films. The electric heating film cured precast beam integral mould greatly improves the work efficiency of the integral beam mold construction, does not need to suffer partitioned supporting and disassembly, has fast mold release speed, good surface forming quality, high heat energy conversionrate, low cost and high curing efficiency, and is cured by using peak electricity; and the turnover speed of the mold is fast.

The invention discloses a bridge steel box girder aerial work operation platform and a construction method thereof. The operation platform comprises a steel pipe truss, two movable hanging racks and two winches, wherein the steel pipe truss is of a cuboid structure; the two movable hanging racks are symmetrically arranged on the left side and the right side of a steel box girder to be operated bytaking the longitudinal central line of the steel box girder to be operated as a symmetrical axis, each movable hanging rack comprises two F-shaped supports and a plurality of connecting rods, each F-shaped support comprises a main rod and two transverse rods, two vertical rods are arranged between the two transverse rods of each F-shaped support, the lower end of each vertical rod extends downwards and is lower than each lower transverse rod, and a wheel is arranged at the lower end of each vertical rod extending downwards; two upper chord main pipes of the steel pipe truss are fixedly connected with the two movable hanging racks; the two winches are arranged at a longitudinal end of the upper surface of a top plate of the steel box girder to be operated and are connected with the movablehanging racks through a steel wire rope; a bottom plate of the steel box girder to be operated is connected with two upper chord main pipes of the steel pipe truss through four inverted chains. The operation platform does not influence the traffic under the bridge, and has low cost and high utilization rate.

A T-shaped component manufacturing die comprises a web side die body, a flange side die body and a pedestal terrace. The T-shaped component manufacturing die is characterized in that the web side die body comprises two vertical boards and a top board, the lower ends of the two vertical boards are connected with horizontal L-shaped beams and connected with rhombic retraction jacks in a spaced mode in the longitudinal direction, the flange side die body comprises two side boards and is connected with the pedestal terrace through a bolt, and the width of the upper opening of the flange side die body is smaller than that of the lower opening of the flange side die body. As a door-shaped side die body is adopted, not only can a rectangular component be manufactured, but also a T-shaped or inverted-T-shaped column and a T-shaped or inverted-T-shaped beam can be manufactured by combining the flange side die body, T-shaped columns or beams with different widths and different heights can be manufactured, universality is high, and use efficiency is high.

The inclined wedged fixture and assembling and disassembling tool for building formwork includes polished rod, inclined wedge and characterized inclined sleeve being one long flat steel pipe with hole in the same axial inclination as that of the inclined wedge. The polished rod is penetrated into the hole of the inclined sleeve, and the inclined wedge is wedged into the interval between the polished rod and the inclined sleeve hole. The present invention has separated fixture and assembling and disassembling tool, the formwork position may be regulated with installing pliers with crank link mechanism, and the fixture may be detached with the inclined wedge. The technology of the present invention is simple and reliable, and has easy assembling and disassembling and low cost.

A former assembly for the manufacture of dip product comprises: a thermally conductive outer layer in the shape of said product, said outer layer arranged to receive a film of elastomer; a mounting for mounting said former assembly to a former holder for engagement with a conveyor chain; a heating medium within said outer layer, said heating medium in communication with an energy source for heating said medium, wherein said heating medium is arranged to apply heat through said outer layer so as to cure said resin.

The invention discloses a construction method of a movable assembled light formwork cast-in-place box culvert. The construction technological process is as follows; step 1, an assembled light formwork structure is designed and manufactured; step 2, formwork entry inspection and assembly are carried out; step 3, a box culvert foundation pit is excavated, and a foundation is treated; step 4, a construction bottom plate, a guide wall and wall body reinforcing steel bars are installed; step 5, a core mold and an outer mold are installed; step 6, roof reinforcing steel bars are installed; step 7, a plug plate is installed; step 8, the side wall and top plate concrete are poured and the concrete is cured; step 9, the outer mold is disassembled; step 10, the edge formwork is disassembled and moved; step 11, the middle formwork is disassembled and moved; and step 12, subsequent segment construction is conducted. The cast-in-place reinforced concrete box culvert is suitable for cast-in-place reinforced concrete box culvert construction in highway, railway, water conservancy and municipal pipe gallery projects.

The invention relates to an electric heating film maintaining trapezoidal beam film. The electric heating film maintaining trapezoidal beam film comprises a U-shaped rib, a bottom plate, a side plate,a horizontal rib, an electric heating film, a heat-insulating layer and a protective plate, wherein the horizontal rib is arranged on the upper part of the side plate and extends outwards; the bottomplate and the side plate are in rigid connection; the bottom plate and the side plate are shaped like a horn mouth with a big upper part and a small lower part; the electric heating film adheres to the outer surfaces of the bottom plate and the side plate; the heat-insulating layer is arranged on the outer side of the electric heating film; and the protective plate covers the outer side of the heat-insulating layer. After concrete is formed in a mold, the surface of the mold can be directly heated, so that the electric heating film maintaining trapezoidal beam film is simple to operate and high in maintenance speed; furthermore, the horn mouth-shaped template is adopted, a bottom mold and a side mold are connected into a whole, and a precast beam can directly perform lifting and demolding, so that the mold supporting and disassembling process is omitted.

The invention provides a prestressed special-shaped trough plate. The prestressed special-shaped trough plate comprises a special-shaped concrete slab body and prestressed steel strands buried in thespecial-shaped concrete slab body and taken as main reinforcements. The prestressed special-shaped trough plate is characterized in that the special-shaped concrete slab body comprises a face plate and ribbed beams, the face plate and the ribbed beams are integrated into a whole by pouring, an expanded section flange is arranged at the bottom of each ribbed beam, and longitudinal placing notches are formed in the two sides of the face plate. With the adoption of the prestressed special-shaped trough plate provided with the expanded section flanges at the bottoms of the ribbed beams, the bending resistance of the component is greatly improved, the bearing capacity is improved under the condition of the fixed height of the trough plate, the height of the trough plate is reduced under the condition of the same live load, and meanwhile, the invert arch cracking of the component is effectively controlled under the joint action of the special-shaped concrete slab body and the prestressed steel strands.

The invention discloses a multifunctional stereoscopic combined transformation die, which comprises a moving chassis, a bottom lattice beam, a first die, a second die, a third die A, a third die B and an inner side compartmenting die. Four corners of the moving chassis are provided with four reinforcing cushion blocks, a wheel frame is mounted under the reinforcing cushion blocks, wheels are arranged on the wheel frame, the bottom lattice beam is fixed on the moving chassis, four hook openings of the third die A, the third die B and the inner side compartmenting die and a plurality of die core holes are arranged in the bottom lattice die, and the bottom lattice beam is connected to the first die, the second die, the third die A, the third die B and fasteners of a lower opening of the inner side compartmenting die. A middle lattice beam covers the tops of the first die, the second die, the third die A, the third die B and the inner side compartmenting die, and four hook openings which correspond to the bottom lattice beam and are along a straight line up and down and die core holes are arranged in the bottom of the middle lattice beam. According to the multifunctional stereoscopic combined transformation die, the production manner of a traditional prefabricated part is improved to space stereoscopic production from planar production, such that a production space of a plant can be effectively used, investment of a land capital is reduced and a production amortization cost of the member is reduced.

According to the method and device for adjusting the position of the gravity center of a blade of a wind driven generator. A counterweight point is determined on the blade of the wind driven generatorto be hoisted, a liquid balancing device is arranged on the counterweight point, a built-in counterweight device arranged in the blade of the wind driven generator or an external counterweight devicearranged outside the blade of the wind driven generator, and the gravity center position of the blade of the wind driven generator to be hoisted is adjusted to the position of the gravity center of the blade required by a single-blade lifting appliance by adjusting the mass of the counterweight liquid in the liquid balancing device. According to the method and device, universality of the single-blade lifting appliance is greatly improved, the using efficiency of the single-blade lifting appliance is improved, the unit development progress is accelerated, and the hoisting and spreading cost ofblade is reduced.

The invention discloses a simply supported prefabricated integrally-cast superposed bridge. The prefabricated integrally-cast superposed bridge comprises inverted T-shaped prestressed prefabricated beam parts, cast-in-situ parts and horizontal baffles, and is characterized in that each cast-in-situ part comprises a cast-in-situ plate and a cast-in-situ superposed part at the upper part of the beam part; pretensioned prestressed steel strands are embedded in the upper parts of a web plate and a lower flange of each inverted T-shaped prestressed prefabricated beam part; the horizontal baffles adopt prefabricated plates, and are longitudinally arranged at intervals between the web plates of the adjacent prefabricated beam parts at the two ends of each beam part and positioned above the flanges of the prefabricated beam parts; and the inverted T-shaped prestressed prefabricated beam parts adopt manufacturing moulds commonly used with buildings, and mould plates are good in commonality, convenient to mount and dismount, high in working efficiency and low in amortized cost.

An electric heating film curing prefabricated component die comprises a concrete prefabricated component forming template, an electric heating film and a heat preservation layer. The concrete prefabricated component forming template comprises a panel making direct contact with the concrete surface. The electric heating film is attached to the outer side of the panel. The outer side of the electricheating film is provided with the heat preservation layer. After concrete is poured in the die and formed, temperature rise can be directly conducted on the surface of the die, operation is simple, construction is convenient, the heat energy conversion rate is high, the curing speed is high, the die circulation efficiency is high, and the electric heating film curing prefabricated component die can be used for manufacturing prefabricated components in any site.

The inclined wedged fixture and assembling and disassembling tool for building formwork includes polished rod, inclined wedge and characterized inclined sleeve being one long flat steel pipe with hole in the same axial inclination as that of the inclined wedge. The polished rod is penetrated into the hole of the inclined sleeve, and the inclined wedge is wedged into the interval between the polished rod and the inclined sleeve hole. The present invention has separated fixture and assembling and disassembling tool, the formwork position may be regulated with installing pliers with crank link mechanism, and the fixture may be detached with the inclined wedge. The technology of the present invention is simple and reliable, and has easy assembling and disassembling and low cost.

According to the method and device for adjusting the position of the gravity center of a blade of a wind driven generator. A counterweight point is determined on the blade of the wind driven generatorto be hoisted, a liquid balancing device is arranged on the counterweight point, a built-in counterweight device arranged in the blade of the wind driven generator or an external counterweight devicearranged outside the blade of the wind driven generator, and the gravity center position of the blade of the wind driven generator to be hoisted is adjusted to the position of the gravity center of the blade required by a single-blade lifting appliance by adjusting the mass of the counterweight liquid in the liquid balancing device. According to the method and device, universality of the single-blade lifting appliance is greatly improved, the using efficiency of the single-blade lifting appliance is improved, the unit development progress is accelerated, and the hoisting and spreading cost ofblade is reduced.

The invention discloses a lining circular ring assembled by prefabricated segments with corbel connecting bases and an assembling method of the lining circular ring. The lining circular ring is provided with symmetrical double-sided wedge-shaped rings. The capping block assembling point is located at the 0-degree position of the lining circular ring, the ring width of the outer diameter of the circular ring at the point is the minimum value or the maximum value, the point, opposite to the capping block, of the 180-degree point is a first standard block, and the points, adjacent to the two sides of the first standard block, of the capping block are second standard blocks. The inner arc surface of the second standard block and the inner arc surface of the adjacent block are each provided with a corbel connecting base which is integrally formed and protrudes out of the inner arc surfaces, each corbel connecting base is composed of a connecting base face in the horizontal plane direction and a connecting base face in the vertical plane direction, the four corbel connecting bases are symmetrically distributed in the lining circular ring, and the formed lining circular ring is in a mode1 or a mode 4. The top sealing block and the adjacent blocks on the two sides are spliced into a whole to rotate by 180 degrees around the Y axis to be in place, and the first standard block and the standard blocks sequentially spliced with the first standard block are spliced into a whole to rotate by 180 degrees around the Z axis to be in place in a mirroring mode to form a lining circular ringin a mode 2 or a mode 3. The universality of the segment is improved, and drilling and steel bar planting on the inner arc surface of the segment are avoided.

The invention discloses a multifunctional stereoscopic combined transformation die, which comprises a moving chassis, a bottom lattice beam, a first die, a second die, a third die A, a third die B and an inner side compartmenting die. Four corners of the moving chassis are provided with four reinforcing cushion blocks, a wheel frame is mounted under the reinforcing cushion blocks, wheels are arranged on the wheel frame, the bottom lattice beam is fixed on the moving chassis, four hook openings of the third die A, the third die B and the inner side compartmenting die and a plurality of die core holes are arranged in the bottom lattice die, and the bottom lattice beam is connected to the first die, the second die, the third die A, the third die B and fasteners of a lower opening of the inner side compartmenting die. A middle lattice beam covers the tops of the first die, the second die, the third die A, the third die B and the inner side compartmenting die, and four hook openings which correspond to the bottom lattice beam and are along a straight line up and down and die core holes are arranged in the bottom of the middle lattice beam. According to the multifunctional stereoscopic combined transformation die, the production manner of a traditional prefabricated part is improved to space stereoscopic production from planar production, such that a production space of a plant can be effectively used, investment of a land capital is reduced and a production amortization cost of the member is reduced.

The embodiment of the utility model discloses a prefabricated cast-in-place laminated integral beam, in the specific implementation mode, the prefabricated cast-in-place laminated integral beam is composed of two prefabricated concrete beams and a cast-in-place laminated part, each prefabricated concrete beam is composed of an upper web and a lower flange, and the lower flanges of the two prefabricated concrete beams are in direct contact. The two prefabricated concrete beams are spliced and enclosed to form a construction formwork for concrete pouring of the cast-in-place laminated part, stirrups of the prefabricated concrete beams extend out of the top face of the web and the top face of the lower flange close to the cast-in-place laminated part and then extend upwards to the position below the top face of the prefabricated cast-in-place laminated integral beam, and waist drag hooks of the prefabricated concrete beams are completely located in the web. According to the implementation mode, the self weight of the prefabricated beam of a common frame beam in a building can be controlled to be below 6 tons, the hoisting efficiency is high, the connection integrity of the prefabricated part and the cast-in-place part is good, meanwhile, when the prefabricated beam is manufactured, a mold and an exposed rib do not interfere with each other, mold removal is easy, the mold turnover frequency can be greatly increased, and the mold amortization cost is reduced.

The invention provides a metal clamp fastening structure for template secondary ridges in building construction. Top surfaces of a first inner U-shaped clamping sheet and a second inner U-shaped clamping sheet of the clamp fastening structure are provided with U-shaped bulged ends and are respectively fixed at the two sides of each secondary ridge; an outer U-shaped clamping sheet is arranged at one side of each of two primary ridges; a first inner U-shaped clamping sheet and the second inner U-shaped clamping sheet are arranged at the other sides of the primary ridges; an all-thread screw sequentially penetrates through the outer U-shaped clamping sheet at one side of each secondary ridge, two round steel brackets and the first inner U-shaped clamping sheet, and the two ends of the all-thread screw are fastened through fixing bolts; and the all-thread screw sequentially penetrates through the outer U-shaped clamping sheet at one side of each secondary ridge, two round steel brackets and the second inner U-shaped clamping sheet, and the first inner U-shaped clamping sheet, and the two ends of the all-thread screw are fastened through fixing bolts. The metal clamp fastening structure has the effect that: the positions of the secondary ridges and distance of the secondary ridges can be precisely controlled and fixed; the stability of the secondary ridges can be greatly improved; the operation process is simple and convenient; the comprehensive cost is low; and rigidity and reliability of a mould are effectively improved, so that the quality of a concrete component is greatly improved.

The utility model discloses an assembly type prefabricated stair mould, including ladder step mould and backplate mould, both sides of ladder step mould and backplate mould all are provided with side end mould, and the front end surface bolt connection of ladder step mould has ladder step adjusting module, and the first connecting portion is fixed on the ladder step adjusting module, and the front end surface bolt connection backboard adjusting module of backplate mould, and the second connecting portion is fixed on the backboard adjusting module, and the first connecting portion with the second connecting portion is locked through long bolt structure and is distanced, through the setting of ladder step adjusting module, backboard adjusting module, end mould adjusting module, can realize the prefabrication of the stair of same ladder step and step size of different sizes, and the great improvement of the compatibility, through setting backplate standard section, the overall reuse rate of mould improves, and the cost of sale reduces, and the expenditure of stair mould reduces significantly.

A simply-supported-to-continuous prefabricated integrally-cast superposed continuous bridge comprises inverted-T-shaped pre-stress prefabricated beams, a cast-in-place portion and a transverse partition plate, and is characterized in that the cast-in-place portion comprises a cast-in-place plate and cast-in-place superposition portions on the upper portions of the beams, pre-tensioning pre-stressed steel wires are embedded into the bottom flange and the upper portion of a web of each inverted-T-shaped pre-stress prefabricated beam, a galvanized steel plate is arranged on the cast-in-place plate bottom surface between the two prefabricated beams, and the transverse partition plate is a prefabricated plate and perpendicularly arranged between the webs of the adjacent inverted-T-shaped beams above the flanges of the inverted-T-shaped beams at a certain distance. The inverted-T-shaped prefabricated beams are light in dead weight so as to be convenient to transport and mount and high in construction speed.

A method for monitoring a device (1) for regulating the flow of gas, comprising a flow conduit (2) and a shutter assembly (3) defining a restriction (4) in the flow conduit (2). The method comprises the following operations: causing the gas to pass through the flow conduit (2); defining the corresponding duration (t 1 ...t n ) time interval sequence (Z 1 ...Z n ); at each time interval (Z i ), determine the density of the gas at the restriction (4) (d i ) and velocity (v i ) value; calculate the density (d i ) value, velocity (v i ), the time interval (Z i ) duration (t i ) and correction factor (k i ) to get the corresponding equivalent wear (u i ) values; for each time interval (Z i ), will be the current time interval (Z i ) and the preceding time interval (Z 1 ...Z i‑1 ) calculated for all equivalent wear (u 1 ... u i ) are added together to obtain the cumulative value (cu i ); will accumulate the value (cu i ) is compared with a predefined extreme value (cu*) corresponding to the maximum wear condition allowed for the closure assembly (3) to obtain an indication of the efficiency condition of the closure assembly (3).

The invention provides a metal clamp fastening structure for template secondary ridges in building construction. Top surfaces of a first inner U-shaped clamping sheet and a second inner U-shaped clamping sheet of the clamp fastening structure are provided with U-shaped bulged ends and are respectively fixed at the two sides of each secondary ridge; an outer U-shaped clamping sheet is arranged at one side of each of two primary ridges; a first inner U-shaped clamping sheet and the second inner U-shaped clamping sheet are arranged at the other sides of the primary ridges; an all-thread screw sequentially penetrates through the outer U-shaped clamping sheet at one side of each secondary ridge, two round steel brackets and the first inner U-shaped clamping sheet, and the two ends of the all-thread screw are fastened through fixing bolts; and the all-thread screw sequentially penetrates through the outer U-shaped clamping sheet at one side of each secondary ridge, two round steel brackets and the second inner U-shaped clamping sheet, and the first inner U-shaped clamping sheet, and the two ends of the all-thread screw are fastened through fixing bolts. The metal clamp fastening structure has the effect that: the positions of the secondary ridges and distance of the secondary ridges can be precisely controlled and fixed; the stability of the secondary ridges can be greatly improved; the operation process is simple and convenient; the comprehensive cost is low; and rigidity and reliability of a mould are effectively improved, so that the quality of a concrete component is greatly improved.

The application relates to the technical field of building construction safety protection, and discloses a center column installation turnover cantilever protection device, which comprises steel belts, angle steels, square steel pipes, bolts, round steel pipes and steel sheet nets, wherein the steel belts are arranged in a plurality of strips, are fixed in a hoop around the outer wall of the center column, and are connected into a hoop clamp through the bolts at the two ends; the angle steels serve as main cantilever beams, the vertical limbs of the angle steels are connected with the steel belts through the bolts, and the horizontal limbs of the angle steels are extended to form a cantilever platform; the square steel pipes are connected at the end portions of the horizontal limbs of the angle steels and form an annular outer frame with the adjacent angle steels; the round steel pipes are arranged in a hoop to form a horizontal support system; and the steel sheet nets are laid on the platform surface as a bottom plate for the walking and material placing of workers. The application can provide a working platform and falling protection device which are directly fixed on the installed center column segment, and solve the problems of high cost, slow erection, high risk in the air and poor turnover in the prior art.

An integral mold for prefabricated beams cured by electric heating film comprises a bottom plate, side plates, flexible corners, tie rods, horizontal beams, electric heating film, insulation plates and protective plates. The bottom plate and the side plates form a cavity with an upper opening. A flexible corner is provided at the junction of the bottom plate and the side plates. The bottom plate, the flexible corner and the side plates are connected as a whole. The side plates on both sides are connected at the upper opening by the tie rods. The side plates are welded with vertical ribs arranged perpendicular to the side plates at a certain distance. The vertical ribs are welded to the horizontal beams. The bottom plate is welded with bottom plate stiffening ribs. The outer surfaces of the bottom plate and the side plates are affixed with electric heating film. The outer side of the electric heating film is provided with insulation plates and protective plates. The construction efficiency of the integral beam mold is greatly improved. There is no need to support and dismantle the mold in blocks. The demoulding speed is fast, the surface molding quality is good, and the heat energy conversion rate is high. Peak and valley electricity maintenance is used, which has low cost, high maintenance efficiency and fast mold turnover.