51results about How to "Improve construction stability" patented technology

The invention relates to a method for investigating a tunnel, comprising the following steps: 1) obtaining 3-dimensional data on ground and geology; 2) generating DGME; 3) generating DLEM; 4) generating DTEM; 5) forming an overall 3-dimensional hardware model of the tunnel and selecting a tunneling solution; 6) generating a geological excavation entity; 7) establishing a forecasting model for geological entity section; 8) generating a 3-dimensional steel bar lining diagram of a complex structure; 9) generating a tunnel plane structure diagram: 10) generating a cut and fill entity with different construction stages, guiding tunnel design and construction. By the method of the invention, 3-dimensional effect and geological conditions of the tunnel can be directly obtained for exact, intuitive and convenient selection of the tunneling solution, thus effectively reducing rework, improve investigating quality, construction safety and tunnel stability, coordinating the tunnel mouth with the environment, remarkably improving design effects of a tunnel portal, a tunnel face and a tunnel trunk. As a result, the method of the invention can be widely applied to tunnel investigation, and in terms of engineering application, related softwares can be configured according to actual needs.

The invention discloses a prefabricated bearing platform mounting method and relates to the field of bridge construction. The prefabricated bearing platform mounting method comprises the following steps that a bearing platform and bottom pier bodies are prefabricated in a prefabrication field, and steel pile hole positions are reserved in the bearing platform; the bearing platform is lifted to a pile site by a large floating crane; a pile top guiding device is pre-mounted on steel piles in the pile site before the bearing platform is lifted; after the bearing platform is lifted down and is in place, a carrying pole is arranged on a pile top longitudinal direction adjusting position in a hanging manner, and the horizontal plane of the bearing platform is regulated as required; and the pouring of bottom-sealing concrete of a steel cylinder cofferdam, the water pumping, the binding of reserved hole steel reinforcing bars, and the pouring of reserved hole concrete at non-lifting points and lifting points are sequentially finished, and the steel cylinder cofferdam is detached, so that the mounting of the prefabricated bearing platform is finished. According to the prefabricated bearing platform mounting method disclosed by the invention, a small steel cylinder cofferdam replaces a large bearing platform steel cofferdam, so that the steel material can be effectively saved, the on-water operation time is shortened, and the construction cost is reduced; and meanwhile, the influence of water flow to the construction of the bearing platform is reduced, and the construction quality of the bearing platform is ensured.

The invention discloses a construction and operating method inside an elevator shaft. The construction and operating method comprises the following steps that A, an operating platform is obtained, theoperating platform includes a top frame, a supporting frame and tilted supporting parts, brackets are vertically disposed on the supporting frame, lifting lugs used for lifting are further disposed on the top frame, a construction platform is hinged to the upper portion of the top frame, and a height adjustment mechanism and a levelling controller are disposed between the construction platform and the top frame; B, the operating platform is lifted in the completed elevator shaft through a tower crane, and the brackets are sited on a floor of an elevator shaft door to support the whole operating platform and adjust the height adjustment mechanism, so that the operating platform is in a horizontal state, installation of the operating platform is finished, and operators conduct constructionon the operation table; C, after construction is finished, the operating table is lifted to a last floor; and D, the above steps B and C are repeated until operation and construction in the elevator shaft are completed. The construction and operation method inside the elevator shaft has the advantages that construction difficulties can be reduced, the construction environment can be improved, andimprovement of construction stability and safety is facilitated.

The invention discloses a puttying robot. The puttying robot comprises a storage tank assembly and a puttying rotary assembly; the storage tank assembly comprises a hollow storage tank body, a feedinginlet is formed in the upper part of the hollow storage tank body, a discharging outlet is formed in the lower part of the hollow storage tank body, and the tank body is internally provided with an extruding plate capable of rotating; the puttying rotary assembly comprises a coating belt capable of rotating, the coating belt is provided with a plurality of scraping plates, the discharging outletof the storage tank assembly is formed in one side of the coating belt, thus the scraping plates can scrape putty from the discharging outlet, the puttying rotary assembly is provided with a limitingpart, and the limiting part can keep the part, facing the construction wall surface, of the coating belt to be vertical; and a transition storage groove is formed in the lower part of the coating belt, thus the scraping plates can be connected into the transition storage groove in an abutting mode, the transition storage groove is provided with a groove inlet and a groove outlet, the groove inletis connected with the discharging outlet of the storage tank assembly, and the scraping plates can extend out of the groove outlet. After the puttying robot conducts construction, the wall surface canbe vertical, and the project acceptance standards are met.

The invention discloses a construction method for excavation of a double-side-wall pilot tunnel in a shallow buried section of a small clear distance tunnel. The construction method comprises the following steps that (1) modeling and simulation are performed; (2) construction preparation is performed; (3) tunnel construction is performed, specifically, a left line upper step is excavated, and temporary support and primary support are performed; a left line lower step is excavated, and temporary support and primary support are performed; a core soil upper step is excavated, and temporary support and primary support are performed; a right line upper step is excavated, and temporary support and primary support are performed; a core soil middle upper step is excavated, and temporary support and primary support are performed; a core soil middle lower step is excavated, and temporary support and primary support are performed; a right line lower step is excavated, and temporary support and primary support are performed; and a core soil lower step is excavated, and temporary support and primary support are performed. The construction method has good stability and high safety.

The invention provides a concrete construction method combining BIM. The concrete construction method comprises the following steps that (1) modeling is conducted through a BIM technology, and a shaped template construction drawing is designed; (2) according to the construction drawing in the step (1), templates are processed and assembled; (3) steel bars are bound, a steel bar frame is obtained,and the steel bar frame is arranged in the assembled templates; (4) concrete is configured and prepared, and the concrete is poured into a mold; and (5) curing is conducted, and then mold removal is conducted. According to the concrete construction method, a construction technology is simple and convenient, the product quality stability is good, the concrete construction method greatly improves both the construction process efficiency and stability, and the service life of a poured piece is prolonged.

The invention discloses a technical method of a green sponge roof modified on basis of a grass planting plate. The method comprises the following steps: laying a waterproof material on a roof; laying a root isolation material on the waterproof material; then laying an ecological grass planting plate, and laying an isolation filter material on a water drainage-storage water layer; burying planting soil on a filter layer; and seeding herbaceous plant seeds in the planting soil above the grass planting plate, watering, maintaining, completing the roof vegetation after an ecological colony is formed by herbaceous plants, and forming the green roof. The green roof technique is simple in construction process and easy in operation; the grass planting plate is used as the water drainage-storage layer and the plant planting basic surface, so that compared with the traditional green roof method adopting a coarse sand filter layer and a gravel (cobble and ceramic particles) drainage layer, the construction difficulty is much smaller, the construction stability is high, the construction quality and effect can be guaranteed, and the formed landscape is ecological and attractive.

The invention discloses a liquid aqueous multi-color granite coating and a preparation method thereof, for solving the problems that a conventional aqueous granite coating is severely thickened after a multi-color coating is stored, and is large in viscosity and has easily damaged constructed multi-color particles. The liquid aqueous multi-color granite coating is prepared from the following raw materials in parts by weight: 23.0-27.0 parts of silicone acrylic emulsion, 1.0-2.0 parts of propylene glycol, 1.0-2.0 parts of filming agent, 0.1-0.3 part of defoaming agent, 8.0-14.8 parts of water, 0.1-0.3 part of preservative, 0.1-0.3 part of thickening agent and 58.0-62.0 parts of multi-color particles. According to the coating, multi-color paint protecting glue is used together with special resins, elastic emulsion and silicone acrylic emulsion special for multi-color paint, the reaction gel degrees of different components are controlled to achieve relative balance of a system, the coating is free of color bleeding phenomenon after being stored for a long time and is clear and definite in color particle after being sprayed, the later thickening phenomenon of the stored liquid aqueous multi-color granite coating is effectively solved, and the storage and construction stability is improved.

The invention relates to an evaluation method for arch rib hoisting construction stability based on fuzzy comprehensive evaluation, belonging to the technical field of bridge construction. The method comprises the following steps: S1, determining factors affecting the arch rib hoisting construction stability; S2, dividing the evaluation grades of the arch rib hoisting construction stability according to factor theoretical values and defining critical judgment values of the evaluation grades under the factors; S3, acquiring the actual monitoring values of the factors in a construction process, determining a membership function, and calculating the membership degrees of the stability evaluation grades of the factors; S4, determining the factor weights by means of a subjective and objective combined method; and S5, performing fuzzy comprehensive evaluation on the arch rib hoisting construction stability according to the factor weights and the membership degrees. According to the method provided by the invention, the safety problem in the arch rib construction process is quantitatively evaluated, so that the construction safety and the construction monitoring effectiveness are guaranteed; by treating a fuzzy evaluation object through a precise digital means, quantitative evaluation on fuzzy data is performed.

The invention discloses a recycled aggregate concrete constructability and durability improvement additive and belong to the technical field of building materials. The additive comprises lithium silicate, micro-silicon powder, a composite air-entraining agent, a thickened lubricant, a polycarboxylate superplasticizer and a retarder, wherein the ratio of the lithium silicate to a polycarboxylate superplasticizer mixed solution is 0.001:0.08; the ratio of a common air-entraining agent to a nano air-entraining agent is 0.1-5; and according to weight percents of all the additives in the mixed solution, the micro-silicon powder is 0.25-1.5, the composite air-entraining agent is 0.001-0.005, the thickened lubricant is 0.001-0.003, and the retarder is 0.001-0.05. The additive is applied to concrete engineering and can substantially improve concrete constructability, stability and durability. The additive is suitable for a reinforced concrete structure, a concrete structure and other structures. By use of the additive, the viscosity of concrete can be substantially lowered, and the flow velocity, expandability, crack resistance, constructability and working stability of the concrete are improved.

The invention discloses a shield tunnel prefabricated mid-partition mounting device. The shield tunnel prefabricated mid-partition mounting device comprises a main frame assembly, a mounting trolley assembly and a grabbing assembly, wherein one side of a mounting seat in the grabbing assembly is placed on a cylinder rod of a transverse adjusting oil cylinder; a connecting hinged support is arranged in the middle of the other side of the mounting seat; fine-adjustment hinged supports are separately arranged on the mounting seat and on two sides of the connecting hinged support; a rotary hydraulic motor mounting seat is fixedly hinged to the connecting hinged support; a rotary hydraulic motor is placed on the rotary hydraulic motor mounting seat; fine-adjustment oil cylinders are separately mounted on the fine-adjustment hinged supports on two sides of the connecting hinged support in a hinged manner; and the other ends of the fine-adjustment oil cylinders are fixedly hinged to the fine-adjustment hinged supports on two sides of the rotary hydraulic motor mounting seat. Various properties of a mechanical structure of the shield tunnel prefabricated mid-partition mounting device meet requirements of a construction site; and compared with a traditional construction mode, the shield tunnel prefabricated mid-partition mounting device has the advantages that the construction period can be greatly shortened, the construction stability is good, controllability of a construction process is high, the construction quality of a prefabricated mid-partition is improved effectively, and requirements on construction operation skills of workers are low.

The invention relates to the field of mortar, in particular to ardealite-based sound insulation self-leveling mortar and application thereof. The mortar is prepared from the following raw materials in parts by weight: 30-140 parts of ardealite-based gypsum, 5-20 parts of a sound insulation material and 0.2-1 part of cement. According to the ardealite-based sound insulation self-leveling mortar provided by the invention, the sound insulation materials such as rubber particles are added for modification, so that the construction performance and the construction effect of gypsum-based self-leveling can be ensured, and the sound insulation effect of the ardealite-based sound insulation self-leveling mortar is improved. The sound insulation performance of the material is obviously improved. The ardealite and the waste rubber are used as main raw materials, recycling of solid waste resources is achieved, and compared with traditional sound insulation leveling mortar, the sound insulation leveling mortar has better construction performance and sound insulation performance, facilitates saving of resources and production cost, and can be used for building materials, especially for floor spacing sound insulation.

A connecting rod unit used for scaffold is composed of connecting rod and insertion plate with sectorial or rectangular insertion hole whose width is greater than the thickness of wedge pin. A sleeve ring is welded to the connecting rod and said insertion plate is welded to the sleeve ring. With said connecting rod units, the scaffold can be easily connected together.

The invention discloses a parallel multi-tunnel structure and a construction method thereof. The parallel multi-tunnel structure comprises at least one tunnel I and one tunnel II, wherein the tunnel II is a bored tunnel; the at least one tunnel I comprises a tunnel section I, the tunnel II comprises a tunnel section II, the clear distance between the tunnel section I and the tunnel section II is smaller than 6 m, a plurality of isolating piles are arranged at intervals between the tunnel section I and the tunnel section II, the minimum distance between the outer edge of every isolating pile and the outer edge of the tunnel section II is small than or equal to 0.5 m, and every isolating pile is provided with a displacement and settlement monitoring device. The parallel multi-tunnel structure can effectively block stress transfer caused by construction of two neighboring tunnels, avoid accidents during bored tunnel excavation due to insufficient clear distance, facilitate monitoring of disturbance influence, reduce risk during excavation, optimize full-length construction organization, effectively improve the construction efficiency, shorten the construction period and reduce the construction cost.

The invention relates to an asphalt preparation method, and discloses a preparation method of an environmental-friendly rubber asphalt. The environmental-friendly rubber asphalt comprises 70 to 100 parts of No.90 petroleum asphalt, 20 to 40 parts of a rubber powder, and 0.2 to 5 parts of a deodorant. The preparation method comprises following steps: at a certain temperature, petroleum asphalt is heated for melting, a hydrogen sulfide removing agent is added, high speed shearing (shearing speed is controlled to be 2000 to 4500r / min) is adopted, stirring is carried out for 0.5h, the rubber powder is added, high speed shearing is carried out at a rotating speed of 5000r / min for 40min, volatilized gas including alkanes, mercaptan, and alkenes is subjected to concentration recycling, reinjection is carried out in cooling process, so that the environmental-friendly rubber asphalt is prepared. Adding of the hydrogen sulfide removing agent is capable of removing hydrogen sulfide gas volatilized from asphalt, concentration treatment is capable of recycling asphalt effective components with boiling points ranging from room temperature to processing temperature. The preparation method is capable of reducing volatilization of harmful substances, improving pavement performance, improving production process, and providing a feasible approach for ecological environment protection.

The invention discloses a construction method of an ecological seawall. The construction method comprises the following steps of 1) construction of an artificial coral reef layer, 2) construction of afirst transition layer, 3) construction of a salt marsh layer, 4) construction of a second transition layer, 5) construction of a mangrove planting layer, and 6) construction of a slope protection surface. According to the construction method of the ecological seawall, the stability and reliability of the ecological seawall can be improved, the habitat environment can be provided for aquatic animals, the diversity of ecological seawall organisms is improved, and direct scouring of seawater to the seawall is greatly reduced through first-level blocking of the seawater.

The invention discloses a secant pile guide wall formwork. In the construction process, for installation and construction of the guide wall formwork, a first locking assembly, an inner threaded sleeve and a second locking assembly are used cooperatively, so that the construction stability of the secant pile guide wall formwork can be improved, the construction quality of the secant pile guide wall formwork is improved, the formwork can be correspondingly regulated and controlled according to actual construction requirements, the construction flexibility of the formwork is improved, the actual construction requirements can be preferably met, and the overall construction economic benefits are improved. According to a formwork supporting structure construction method of the secant pile guide wall formwork, the standard formwork of the secant pile guide wall aluminum formwork adopts dense rib design, has the advantages of high rigidity, no deformation or bulge, convenience and rapidity in operation, low labor intensity and high efficiency and can be quickly disassembled, the shaping design is adopted for safe, efficient and easy operation of use of on-site disassembly and assembly transportation tools, factory production and manufacturing are achieved, and the formwork project quality is high.

The invention discloses an epoxy structural adhesive which comprises a component A and a component B. The component A comprises epoxy resin. The component B comprises epoxy resin and a curing agent, the curing agent is polyetheramine, and the epoxy resin and the polyetheramine are subjected to an addition reaction in advance to form a chain extension pre-polymerized epoxy curing agent. According to the double-component epoxy structural adhesive, the polyetheramine is added into the component B to serve as a curing agent, and the curing agent and the epoxy resin form an epoxy curing agent, so that the curing agent is moderate in viscosity, retains flexible blocks of the polyetheramine, is high in activity at low temperature, can promote rapid curing of the epoxy resin at low temperature, and is good in water resistance and low in surface tension; the epoxy structural adhesive has the advantages of excellent mechanical properties and flexibility, high strength and favorable temperature resistance, and thus, has excellent impact resistance.

The invention provides a tension detection device. A support is vertically installed on a base. A tensioner is arranged on the top of the support in a hoisting mode. A motor is connected with a reduction box, and is installed below the seat. A protrusion for fixing an H-shaped wheel is arranged on the base above the reduction box. A tensioning arm winding tube is arranged on one side of the base, a tensioning arm is arranged above the tensioning arm winding tube, the tensioner corresponds to the tensioning arm in the axial direction, a paying off device is arranged above the tensioning arm, and a wire clamping plate is arranged on one side of the base. The motor is controlled by an electric control system, and rotation speed of the reduction box is displayed through a display device. The wire clamping plate is aligned to the paying off device. The tension detection device has the advantages that the problem that a specific tension value can not be read out is solved, working efficiency and construction stability of workers are improved, accuracy and consistency of tension detection are increased, the structure is simple and operation is convenient.

The invention discloses a self-anchorage cable bent tower driving cross brace arranging method. The method comprises the following steps of 1 machining a cross brace body, 2 machining a steel casing pipe, 3 lifting a cross brace body and the steel casing pipe, 4 installing a jack and 5 performing welding and fixing. The overall anti-bending capacity of the cable bent tower can be improved, a transverse brace steel tube bearing beam and a steel casing pipe bearing beam are arranged inside the cross brace steel pipe and the steel casing pipe in advance respectively, then, in the installing process, the jack can synchronously act on the cross brace steel pipe and the steel casing pipe according to the designed jacking force, and then the movable connection portion of the cross brace steel pipe and the steel casing pipe is welded and fixed after the cross brace steel pipe and the steel casing pipe are in place; according to the method, under the concrete dead-weight construction load and wind load effect, the pylon root pulling stress can be greatly lowered, and therefore the pylon generate no crack; it is ensured that construction is performed in order while the construction quality is ensured; meanwhile, construction of the cross brace is convenient, and the construction safety and stability can be improved.

The invention discloses a steel casing type deep sea vibroflotation pile construction method. The steel casing type deep sea vibroflotation pile construction method comprises the steps that (1) a steel casing is driven to a set depth below a sea bottom surface at a set pile position by a floating crane installed on a crane vessel; (2) seawater inside the steel casing is pumped, and soil inside thesteel casing is removed; (3) a vibrator is placed into the steel casing through the floating crane and descends to the specified depth, sand is backfilled into the steel casing, and then the vibratoris started to vibrate the sand; (4) the floating crane is used for simultaneously lifting the steel casing and the vibrator, and the sand is continuously backfilled into the steel casing and vibratedsection by section; and (5) when the steel casing and the vibrator leave the sea bottom surface, backfilling of the sand is stopped, and the vibrator is closed to complete the pile making process. Byusing the steel casing type deep sea vibroflotation pile construction method, a water-free environment can be created in a deep water area for construction to prevent filler such as the backfilled sand from being washed away by the water flow, the construction difficulty of reinforcing a foundation in the deep water area is greatly reduced, and the construction stability is increased.

The invention discloses a prefabricated bearing platform mounting method and relates to the field of bridge construction. The prefabricated bearing platform mounting method comprises the following steps that a bearing platform and bottom pier bodies are prefabricated in a prefabrication field, and steel pile hole positions are reserved in the bearing platform; the bearing platform is lifted to a pile site by a large floating crane; a pile top guiding device is pre-mounted on steel piles in the pile site before the bearing platform is lifted; after the bearing platform is lifted down and is in place, a carrying pole is arranged on a pile top longitudinal direction adjusting position in a hanging manner, and the horizontal plane of the bearing platform is regulated as required; and the pouring of bottom-sealing concrete of a steel cylinder cofferdam, the water pumping, the binding of reserved hole steel reinforcing bars, and the pouring of reserved hole concrete at non-lifting points and lifting points are sequentially finished, and the steel cylinder cofferdam is detached, so that the mounting of the prefabricated bearing platform is finished. According to the prefabricated bearing platform mounting method disclosed by the invention, a small steel cylinder cofferdam replaces a large bearing platform steel cofferdam, so that the steel material can be effectively saved, the on-water operation time is shortened, and the construction cost is reduced; and meanwhile, the influence of water flow to the construction of the bearing platform is reduced, and the construction quality of the bearing platform is ensured.

The high-safety-coefficient maintenance platform for the hydropower station generator set comprises a lower platform body, a support and an upper platform body which are sequentially arranged from bottom to top, a hollow channel is formed in the support, a lift car moving up and down along the support is arranged in the channel, and a movable moving platform is arranged on the outer portion of the support in a surrounding mode; the movable platform is fixedly connected with the lift car and moves up and down along the support, a vertical opening is formed in one side of the support, and the side, corresponding to the opening, of the lift car communicates with the surface of the movable platform. The aerial platform is provided with the three loading platforms, so that the aerial platform which is large in area and stable is provided, the aerial platform can cover all directions in the vertical direction of the internal space of the generator set, workers can stand on the three different platforms to carry out various work such as installation, disassembly and maintenance, and the aerial platform has higher construction stability and safety coefficient; and large working equipment can be borne, and high-efficiency maintenance and repair are facilitated.

The invention discloses a revolving locking device of a regenerating train. The revolving locking device of the regenerating train comprises a secondary beam, a front axle and a back axle, wherein a revolving locking component comprises a revolving platform, a transverse oil cylinder, a locking pin, a locking pin fixing seat and a locking ring respectively; the front axle and the back axle are provided with a transverse oil cylinder fixing seat respectively; transverse oil cylinders are arranged among the transverse oil cylinder fixing seats and the secondary beam respectively; the locking pin fixing seats are arranged at the bottom of the secondary beam respectively; the locking rings are arranged on the front axle and the back axle respectively and are located below the locking pin fixing seats; the locking rings are provided with multiple fixing sleeves. Through the above way, according to the revolving locking device of the regenerating train, the front axle and the back axle can revolve under the push of the transverse oil cylinder, so as to change an advancing angle; by utilizing the cooperation among the locking pins and the fixing sleeves, the wobble of the revolving platforms is avoided, and the precision of a running trajectory is promoted.

The invention belongs to the technical field of cantilever casting beam special-shaped formwork construction, and relates to a lateral moving device of a hanging basket formwork. The device comprisesa lateral working platform, a mobile trolley, a lateral adjusting rod and a triangular stabilizing frame; the mobile trolley is arranged on the upper surface of the lateral working platform and slidesfreely on the upper surface of the lateral working platform; one end of the lateral adjusting rod is movably arranged on the mobile trolley, and the other end of the lateral adjusting rod is movablyconnected with one vertex of the triangular stabilizing frame; and one vertex of the triangular stabilizing frame is movably arranged on the mobile trolley. The lateral moving device of the hanging basket formwork can realize safe demoulding, saved transportation and high construction stability.

The invention discloses a stable pumping type slump retaining agent and a preparation method thereof, and belongs to the technical field of concrete. The slump retaining agent is mainly prepared by polymerizing the following components in parts by mass: 18.6 to 20.1 parts of polyether alcohol, 301.8 to 310.0 parts of cyclic monomer, 0.3 to 0.9 part of catalyst, 42.5 to 43.6 parts of ester substance, 2.1 to 5.4 parts of reducing agent, 2.5 to 4.4 parts of initiator, 0.8 to 2.6 parts of chain transfer agent, 5.3 to 7.9 parts of neutralizing agent and the balance of water, wherein the total mass of the raw materials is 1000 parts. The polyether monomer is firstly prepared, the acid-ether ratio of the prepared slump retaining agent is determined according to the molecular weight of the prepared polyether, and the coating performance of the molecules of the slump retaining agent is improved. The molecular branch chain of the slump retaining agent is a polyether branch chain which has good flexibility and hydrophilicity and shows the coating performance and high slump retaining performance of the slump retaining agent.

The invention provides a manned lifting device for building wall surface detection and repair. The manned lifting device comprises a supporting steel frame and a bearing steel frame, wherein the bearing steel frame is positioned above the supporting steel frame, and at least one lifting assembly is arranged between the bearing steel frame and the supporting steel frame; a lifting supporting blockused for supporting the lifting assemblies is arranged at the top of the supporting steel frame, and bases are arranged at the positions, corresponding to each lifting assembly, of the bottom of the bearing steel frame; each lifting assembly is composed of a linear driving mechanism and a lifting supporting part; and each lifting supporting part is formed by seamless butt joint of a plurality of lifting supporting plates, a guide channel used for allowing the lifting supporting plates to pass through is formed in each lifting supporting block in a penetrating mode, and a locking mechanism is arranged on one side of each lifting supporting block. According to the manned lifting device, the structure is simple, construction and mounting operation is facilitated, the lifting structure adoptsmodular design, the problems of shaking and inconvenient mounting of traditional lifting are avoided, meanwhile, secondary damage to the wall surface is avoided, and the construction stability is high.

The invention discloses concrete pumping equipment and an arm rest tail end vibration reduction method for a concrete pump truck. The concrete pumping equipment comprises a concrete conveying pipe and a gas charging system. The gas charging system comprises a pressure gas source (1) and a gas charging pipeline (2), the gas charging pipeline is connected with the pressure gas source and the concrete conveying pipe so as to charge pressure gas into a pipe cavity of the concrete conveying pipe. The pressure gas is creatively charged into the concrete conveying pipe through the gas charging system which is additionally arranged, so that the continuous gas is charged into the discontinuous size of concrete which is pumped discontinuously, and pumped media flow continuously; thus, pumping impact is reduced radically, and the purpose of reducing the tail end vibration of an arm rest is achieved; in addition, the pressure gas is charged, so that multiphase flows are formed inside the concrete conveying pipe, internal energy consumption among the multiphase flows is increased, and vibration is also relieved radically. Therefore, in the construction process of the concrete pump truck, the arm rest tail end displacement vibration can be reduced initiatively, and the construction stability of the concrete pump truck is improved.

The invention discloses a construction method of an elevator shaft operation platform. The construction method comprises the following steps that A, the operation platform is acquired, the operation platform comprises a top frame, a support frame and a diagonal bracing member, the support frame is provided with a bracket vertically arranged, and the top frame is further provided with a lifting lugfor lifting; a construction platform is hinged to the upper part of the top frame, and a height adjusting mechanism is arranged between the construction platform and the top frame; B, the operating platform is lifted to a completed elevator shaft through a tower crane, the bracket is located on a floor slab at an elevator shaft door to support the entire operation platform, the height adjusting mechanism is adjusted to enable the construction platform to be in a horizontal state, the installation of the operation platform is completed, and construction personnel carries out construction on the construction platform; C, after the construction is completed, the operating platform is lifted to an upper floor; and D, the steps B and C are repeated until the operation construction in the elevator shaft is completed. The construction method has the advantages of being able to reduce construction difficulty, improving the construction environment, improving construction stability and safetyand the like.