79results about How to "Safe dismantling" patented technology

The invention relates to a receding construction method of a cradle of a continuous girder bridge made of prestressing concrete, which is characterized in that the bridge surface of a bridge prefabricated by concrete is provided with a track and a door-shaped truss traveling device, and the width of a ceiling girder inside the door-shaped truss traveling device is wider than that of the bridge surface by 90cm-110cm; a front bottom cross beam and a rear bottom cross beam must extend to the outer side of an external mold by 45cm-55cm to form a main cradle truss, and an overhanging auxiliary door frame is additionally arranged outside the main cradle truss, after the construction of a closure segment of the bridge prefabricated by concrete is finished, and precise rolling deformed steel bars with the diameter of 32 outside a box girder positioned on the overhanging auxiliary door frame are connected with the rear bottom cross beam to disassemble a rear hanging strip; a bottom mold frame is separated from a beam body by utilizing a manual spiral type jack to loose the precise rolling deformed steel bars positioned on the door frame and the front bottom cross beam; a leading chain or a hoist are utilized to drive the main cradle truss so that the cradle recedes in a slideway to a first cast-in-situ segment; and a bottom mold and the external mold are fallen by the leading chain or the hoist to disassemble the main truss.

The invention discloses a high-rise building construction assembled overhanging safe guarding shed and a construction method thereof. The safe guarding shed is built by an overhanging main beam, a horizontal cross rod, a protective barrier, a stressed hinged seat, a reverse-drawing anchoring seat, a pull-back cable and the like, wherein, the overhanging main beam, the horizontal cross rod and the protective barrier are connected with each other to form a double-layer guarding shed, the stressed hinged seat and the reverse-drawing anchoring seat are respectively fixed on the main structure of the building, and one end of the overhanging main beam is connected with the stressed hinged seat; one end of the pull-back cable is connected with the reverse-drawing anchoring seat, and the other end thereof is connected with a reverse-drawing point arranged on the overhanging main beam. The safe guarding shed has simple and reasonable structure as well as simple and convenient method, leads the main beam of the shed body to be directly attached on the main structure of the building and extended to be a whole by assembly, and overcomes the defects of the traditional guarding shed, so as to improve the bearing capacity and shock resistant strength of the guarding shed, ensure the construction to be safe and be convenient and fast in mounting and demounting.

The invention relates to a construction method for dismantling a large-span pre-stressed cast-in-place box girder, which comprises the following steps: S1, dismantling an accessory structure, and dismantling bridge deck pavement and traffic facilities on a box girder; S2, cutting an expansion joint, breaking concrete at the expansion joint of the box girder, and cutting off connecting steel bars, angle steel and bolts at the expansion joint; S3, cutting the box girder, firstly, adopting a disk lock scaffold for building a dismantling scaffold which tightly abuts against the bottom plate of the concrete box girder and the wing plates on both sides, and cutting the box girder by adopting a diamond wire saw, wherein the dismantling sequence of the box girder is as follows: symmetrically cutting wing plates on two sides, releasing web steel strands, cutting a left web, cutting a box type top plate, cutting a right web and cutting a box chamber bottom plate; and S4, hoisting and dismantling the beam blocks, and specifically, transferring and abandoning the cut beam blocks to a designated place through hoisting equipment. The construction method has the effect of safely and rapidly dismantling the large-span pre-stressed cast-in-place box girder.

The invention relates to a technology for disassembling negative rings of a TBM (tunnel boring machine) arrival hole. The technology is characterized in that firstly a set of complete negative ring disassembling and hoisting equipment is assembled, and is welded to form a steel bracket which is provided with a hoisting point; one steel rope is sequentially connected with a storage battery car outside the hole, penetrates through the hoisting point, and is used for hoisting pipe pieces through a hoisting bolt; a pulley inside the hole is fixed to the top of each of the pipe pieces through bolts; one end of another steel rope is connected with a storage battery car inside the hole and then goes around the pulley inside the hole, and the other end of the steel rope is used for hoisting the pipe pieces through hoisting bolts. The negative rings are disassembled through the following steps of (1) disassembling steel shotcrete; (2) assembling the hoisting equipment; (3) disassembling a reaction frame; (4) mounting the pulley inside the hole; and (5) disassembling the negative rings, wherein the negative rings are disassembled in a manner that the pipe pieces are separately disassembled, F pipe pieces and adjacent pipe pieces are disassembled at the same time, and the negative rings are disassembled in the disassembling sequence that the pipe pieces are sequentially and symmetrically disassembled from top to bottom. According to the technology disclosed by the invention, the pipe pieces are protected from being damaged in the disassembling process, so that the cyclic utilization number of times of the pipe pieces of the negative rings is increased; original construction machines and tools and original materials are utilized, the investment on the equipment and the materials is reduced, and the utilization rate of the negative rings is increased.

The invention relates to a gas taking connector and an online gas taking method. The gas taking connector comprises a fixed nut, a valve core with a gas taking ejector pin, a propelling part and a quick connector with an automatic sealing structure, wherein the gas taking ejector pin is fixed in the valve core, a through air duct is formed along the axial direction of the valve core, a pin head part stretches out of the front end of the valve core, and the front part and the rear part of the valve core are respectively provided with a baffle mechanism; the propelling part is arranged outside the valve core in a sleeving manner and snapped between the baffle mechanisms on the front part and the rear part of the valve core, the periphery of the propelling part is provided with outer threads which are matched with the inner threads of the fixed nut, and the propelling part is also provided with a propelling control part so as to drive the valve core to move in the fixed nut; one end of the quick connector can be connected with the tail end of the valve core in a sealing manner. By adopting the gas taking connector and the online gas taking method, the gas leakage in the gas taking process can be maximally eliminated, and the potential danger caused by the fault operation of people in the detection process can be prevented by virtue of the normalized operation method.

The invention relates to a tunnel connection channel rapid construction method based on a telescopic steel pipe piece, and belongs to the technical field of computer image processing. The tunnel connection channel rapid construction method comprises the following steps that the telescopic steel pipe piece is installed, a bottom bearing plate of the telescopic steel pipe piece extends outwards until the external size of the pipe piece is consistent with that of a concrete pipe piece, and the bottom bearing plate is hoisted to a preset position and connected with prefabricated concrete pipe pieces on the periphery in a through seam splicing mode; before a transverse channel is excavated, glass fiber grouting anchor rods are punched through grouting holes in the bottom bearing plate, and surrounding rock at a rear connecting channel of a steel pipe piece wall is grouted and reinforced; after the surrounding rock reinforcement is completed, the telescopic steel pipe piece is dismantled, and an initial stage of the connection channel is excavated; and finally, the middle stage of the connection channel is excavated until the connection channel is conducted. According to the tunnel connection channel rapid construction method based on the telescopic steel pipe piece, the pipe piece is safely and rapidly disassembled through automatic contraction of the steel pipe piece, and the construction time of the shield connection channel is shortened; and meanwhile, the steel pipe piece can be repeatedly used, and the construction cost is reduced.

The invention discloses a building demolition method using a self-expansion effect of an expansion agent. The building demolition method using the self-expansion effect of the expansion agent comprises the following steps that step 1, the number of falling layers, destruction layers and destroying layers of a building to be demolished is calculated; step 2, stand columns of the destruction layersare marked; step 3, pouring holes are formed; step 4, oil storage holes are formed; step 5, expansion agent mixtures are prepared; step 6, the expansion agent mixtures are poured; step 7, openings ofthe pouring holes are closed by sealing devices; and step 8, burning devices are arranged to burn the stand columns, the stand columns are completely destroyed, and the demolition of the building is realized. According to the building demolition method using the self-expansion effect of the expansion agent, the problems of long demolition cycle, high demolition cost and high danger can be solved,and the momentum generated by the self-weight falling from the upper part of the building is used for destroying the entire building, the demolition of the building is realized in safety and controllability modes, the demolition cycle is short, the operation is simple, the demolition cost is low, and the safety and reliability are achieved.

The invention discloses a self-disassembly device of an upper mechanism of a crane, the crane and a self-disassembly method. The device comprises a derrick mast, a hoist, a support, a lifting steel wire rope arranged on the hoist, an amplitude-variation steel wire rope and a pull calabash. A hinge part is arranged at the lower end of the derrick mast, a first pulley is arranged at the upper end ofthe derrick mast, and a second pulley is arranged on the support; the lifting steel wire rope penetrates through the first pulley, a lifting hook is connected to the outer end of the lifting steel wire rope, and one end of the amplitude-variation steel wire rope is connected to the upper side of the derrick mast, penetrates through the second pulley and is connected with the pull calabash. According to the self-disassembly device, the derrick mast is stable in structure and low in weight and is conveniently assembled and disassembled on the tower crane during disassembly, the pull calabash can be adopted for the derrick mast for amplitude-variation adjustment, the device can adapt to disassembly of different parts and is easy to operate and convenient to use, the \ time of disassembling the tower crane is greatly shortened, and the working efficiency is improved.

The invention relates to a dismounting method for pipe joints of an immersed tube tunnels, and belongs to the technical field of hydraulic engineering. An immersed tube tunnel dismounting technology is absent at present, and therefore, a waste immersed tube tunnel cannot be dismounted, so that influence is generated on a marine environment. The dismounting method fills the technical blank. The dismounting method comprises a step of mounting a steel sealing door, a step of dismounting an end part anti-thrust section and a step of dismounting tunnel pipe joints. The dismounting method is used for dismounting the immersed tube tunnel.

The invention relates to a high-rise residential long-span interval corridor high-altitude formwork steel platform construction method. The construction method includes the following steps: step 1: asteel platform is deep designed and processed; step 2: hoisting and anchoring of a section steel main beam are conducted; step 3: installation of a section steel secondary beam is conducted; step 4: inclined support setting of the section steel main beam is conducted; step 5: plane protection setting is conducted; step 6: external protection frame erection is conducted; step 7: formwork support frame erection is conducted; step 8: beam and slab formwork installation is conducted; step 9: beam and slab reinforcement binding is conducted; step 10: concrete pouring is conducted; step 11: formworkremoval is conducted; step 12: corridor decoration construction is conducted; step 13: peripheral support removal is conducted; and step 14: steel beam removal is conducted. According to the technical scheme, a large-span steel beam is used as a main force-bearing component of a supporting platform, and a certain number of transverse connection steel secondary beams are set among steel beams to form a complete and reliable structural construction formwork steel platform.

The invention provides a cast-in-place box beam and cross beam multi-layer steel bar installation supporting system device and a construction method thereof. The cast-in-place box beam and cross beam multi-layer steel bar installation supporting system device comprises a supporting cushion structure. The adjustable bottom support is arranged on the supporting cushion structure; the disc buckle frame body is detachably connected with the adjustable bottom support; and the supporting cross rod is arranged on the disc buckle frame body. The whole device is simple in structure, stable, reliable and high in operability; the construction method is easy to operate, high in speed and remarkable in work efficiency; standardized manufacturing can be conducted, erecting and disassembling are convenient and safe, cyclic utilization is achieved, cost is saved, and the construction period is shortened; the whole device is clear in force transmission, high in bearing capacity and good in stability, effectively solves the problems of temporary supporting and positioning during binding and mounting of multiple layers of reinforcing steel bars of the cast-in-place box girder and the problem of operation of operators in a reinforcing steel bar cage, and greatly guarantees construction safety in the reinforcing steel bar mounting process.

The invention belongs to the technical field of bridge building engineering construction, and particularly discloses an arc support combined template used for a cast-in-place box beam and an erectingmethod thereof. The arc support combined template comprises multiple arc supports, the arc supports are evenly arranged in the direction of a bridge, and multiple pieces of square timber located on anarc body of the arc support are included and are evenly laid from the lower end to the upper end of the arc body; through the square timber, the arc supports are connected into a whole, the laying supporting face is provided for a side template of the cast-in-place box beam, the cross section of the arc body is in a square or oval shape, the arc body is in face contact with the square timber, theside template of the cast-in-place box beam is formed through sequential connection of multiple bamboo plywood, and the bamboo plywood is fixed to the upper surface of the square timber through nails. Due to use of the arc support combined template, the appearance of the cast-in-place box beam is attractive, the line type is smooth, in the construction, use of mechanical devices like a crane is little, and construction cost is low.

A label fixing structure where a label is fixed to the front surface side of clothing by means of a sewing thread. The label is lock stitched by the sewing thread consisting of a needle thread exposed to the front surface side of the label and a bobbin thread exposed to the back side of clothing to be fixed with the label. Starting position and ending position of lock stitch are spaced apart by a predetermined dimension from the right and left ends. An unsewn raveling cord consisting of the needle thread or the bobbin thread and having a length of 0.3-2.0 cm is extended to a rear position continuous to the end-of-sewing position and/or a front position continuous to the start-of-sewing position and then the raveling cord is pulled and drawn out, thus removing the label from the clothing.