125 results about "Penstock" patented technology

The invention discloses a hydropower station ecological flow discharge system and discharge method, the system is applied to a pressure steel pipe diversion type hydropower station, the system comprises a bypass pipe, the inlet end of the bypass pipe is connected with a pressure steel pipe, and the bypass pipe is used for draining water flow in the pressure steel pipe; the water measuring weir is connected with the outlet end of the bypass pipe, and the water measuring weir is used for discharging ecological flow; the monitoring module is arranged on the measuring weir, and the monitoring module is used for monitoring the water level data of the measuring weir; the control valve is arranged on the bypass pipe, and the control valve is used for adjusting the water flow of the bypass pipe according to the analysis result of the water level data so as to control the flow discharge amount of the measuring weir. According to the embodiment of the invention, the ecological flow discharge of the pressure steel pipe diversion type hydropower station can be realized, and the stability and ecological benefits of the ecological flow discharge are improved. The method can be widely applied to the technical field of water conservancy and hydropower.

The invention belongs to the technical field of weld joint corrosion prevention, and particularly relates to an automatic spraying detection device and method applied to an anti-corrosion material at a weld joint of a pressure steel pipe, the automatic spraying detection device comprises a workbench, a support and a bottom plate, the top end of the workbench is fixedly provided with a storage box used for storing the anti-corrosion material, and the workbench is fixedly provided with a turntable with a cavity; the rotating disc is communicated with the storage box through a communicating pipe, a plurality of conveying pipes are rotatably installed on the rotating disc, extension pipes are slidably installed on the multiple conveying pipes, spray heads are arranged at the top ends of the extension pipes, thickness gauges are arranged on the extension pipes, and a booster pump is arranged on the workbench. Automatic spraying and detection of the anti-corrosion material at the weld joint of the pressure steel pipe are achieved, the spraying efficiency is greatly improved, the uncertainty of manual operation is reduced, the thickness of an anti-corrosion layer is more uniform, the opportunity that workers make contact with the anti-corrosion material can be reduced, and the probability of occupational diseases is reduced.

The present application relates to the technical field of water resources and hydropower. Disclosed is a circumferential stiffener assembling device suitable for unequal-diameter penstocks of a pumped storage power station. The circumferential stiffener assembling device comprises: a traveling mechanism (1) capable of being adapted to end faces of penstocks with different diameters, and a circumferential stiffener assembling hanger (2) fitting with outer surfaces of the penstocks with different diameters, wherein the traveling mechanism (1) extends outwards to provide an expansion connecting base (3) connected to the top of the circumferential stiffener assembling hanger (2). The present application has the abilities of position adjustment and movement, and can realize the assembly of circumferential stiffeners with different diameters and different pitches by means of simple adjustment; the circumferential stiffener assembling device travels in a circumferential direction of the penstocks, thereby realizing the assembly of a ring of circumferential stiffener sections; the present application has the function of automatically aligning the circumferential stiffeners during assembly, thus eliminating the procedures of scribing and alignment; and the present application has the ability of automatic seam compression, and can effectively eliminate gaps between the circumferential stiffeners and the outer diameters of penstock walls.

The invention discloses a pressure steel pipe derusting device which comprises a roller carrier, a pressure steel pipe derusting device, a pressure steel pipe derusting device and a pressure steel pipe derusting device. The roller carrier is provided with a hydraulic jacking mechanism, and a pair of power roller sets are symmetrically arranged above the roller carrier. And the rust removal assembly comprises a support, an outer wall impeller head and an inner wall impeller head, blasting openings of the outer wall impeller head and the inner wall impeller head face the outer wall of the same part of the pressure steel pipe, and sand blasting materials are fed into a recycling box through recycling mechanisms by recycling openings of the inner wall, the outer wall impeller head and the inner wall impeller head. The invention further discloses a pressure steel pipe rust removal method. The steel pipe shot blasting machine can solve the technical problems that a traditional steel pipe shot blasting machine is low in inner wall and outer wall synchronous treatment efficiency, materials cannot be recycled and the like, is suitable for automatic rust removal operation of pressure steel pipes with different pipe diameters and curvatures, ensures that the surface roughness and cleanliness reach the standard through dynamic parameter cooperative control and real-time quality monitoring, and improves the production efficiency. According to the partition mode, the efficient rust removal effect is achieved for local quality differences.

The invention discloses a numerical simulation method for different pre-crack propagation of a pressure steel pipe welding joint. The numerical simulation method comprises the following steps: S1, calculating the change rule of the mechanical property and the thermal physical property of steel along with the temperature through JmatPro; by analyzing change characteristics of crack stress under multiple working conditions such as different initial crack angles, positions and welding residual stress, a basis is provided for preventing crack propagation and identifying dangerous working conditions, so that safe and stable operation of a vertical shaft structure is guaranteed, the problem of pipeline crack propagation caused by the welding residual stress can be effectively prevented, and the working efficiency is improved. Therefore, safety accidents such as pipeline breakage and leakage are avoided, and scientific basis can be provided for structural design and welding process optimization of the pipeline by determining the relation between the welding residual stress and the initial crack, so that the design precision and reliability are improved.

The invention relates to the technical field of hydropower station pressure steel pipe detection, in particular to a hydropower station steel branch pipe differential graded loading and unloading hydrostatic test method, system and equipment and a storage medium. The hydraulic test process is scientifically divided into a low-pressure stage, a medium-pressure stage and a high-pressure stage, differentiated boosting amplitude and speed control strategies are adopted in the different stages, the technical limitation of a traditional uniform graded boosting method is broken through, and an innovative control mode of low-pressure fast rising and high-pressure slow rising is achieved. The large boosting amplitude and the high boosting speed are adopted in the low-pressure stage, the bearing allowance of the steel branch pipe in the elastic deformation stage is fully utilized, and the test efficiency is remarkably improved; and in the high-pressure stage, the small pressure increasing amplitude and the slow pressure increasing speed are adopted, the sensitive characteristic when the steel is close to the yield strength is effectively adapted, and the local stress concentration and plastic deformation risks are avoided.

The utility model relates to the technical field of detection robots, in particular to a special detection robot interactive display platform for a pressure pipeline and a volute of a hydropower station, which comprises a C-shaped main body, a movable platform, a rotary connecting piece, a supporting part and a driving mechanism, the movable platform comprises an arc-shaped supporting plate and a frame connected with the arc-shaped supporting plate through a telescopic mechanism and a rotating mechanism, a containing groove matched with the frame is formed in the middle of the C-shaped body, the frame is connected with the C-shaped body through a rotating connecting piece and connected with the output end of the driving mechanism, and the driving mechanism is used for driving the movable platform to rotate along the linear edge of the containing groove. And the movable platform is closed in the accommodating groove or turned into the concave surface of the C-shaped main body from the inside and the outside of the accommodating groove. The interactive display platform integrates the demonstration, display and interaction functions of the detection robot, and the open structure of the C-shaped main body can more clearly and vividly demonstrate the working scene of the special detection robot in a pressure pipeline and a volute.

The utility model relates to a tunnel structure combining diversion, water delivery, emptying and ecological discharge. The method is suitable for the technical field of water conservancy and hydropower engineering. According to the technical scheme, the tunnel structure combining flow guiding, water conveying, emptying and ecological discharging is characterized by comprising a flow guiding tunnel, the first end of the flow guiding tunnel is located on the upstream of a dam, and the second end of the flow guiding tunnel is located on the downstream of the dam; the water intake tower is arranged at the first end of the diversion tunnel, at least two water intake ports located at different heights are formed in the water intake tower, and the water intake ports are provided with water intake gates; the concrete plug is arranged in the diversion tunnel and can be used for plugging the diversion tunnel, and a pressure steel pipe communicated with the upstream and the downstream of the plug is arranged in the plug; at least part of the water conveying steel pipe is located in the diversion tunnel on the downstream side of the concrete plug, and a water inlet of the water conveying steel pipe communicates with the pressure steel pipe in the concrete plug; the blow-down pipe is connected to the water conveying steel pipe and is provided with a control valve; and the ecological drainage pipe is connected to the blow-down pipe and is provided with a control valve.

The application discloses a hydroelectric station ecological flow discharge system and a discharge method, which are applied to a pressure steel pipe diversion type hydroelectric station. The system comprises a bypass pipe, an inlet end of the bypass pipe is connected with a pressure steel pipe, and the bypass pipe is used for guiding water flow in the pressure steel pipe; a measuring weir, the measuring weir is connected with an outlet end of the bypass pipe, and the measuring weir is used for ecological flow discharge; a monitoring module, the monitoring module is arranged on the measuring weir, and the monitoring module is used for monitoring water level data of the measuring weir; and a control valve, the control valve is arranged on the bypass pipe, and the control valve is used for adjusting water flow flow of the bypass pipe according to an analysis result of the water level data, so as to control flow discharge of the measuring weir. The embodiment of the application can realize ecological flow discharge of the pressure steel pipe diversion type hydroelectric station, and improve stability and ecological benefits of the ecological flow discharge. The application can be widely applied to the technical field of water conservancy and hydropower.

The utility model discloses a prefabricated calandria anti-floating fixing device which comprises two fixing frames, a plurality of metal ribs are arranged between the inner walls of the two fixing frames, two anti-floating plates are arranged on one side of each fixing frame, and supporting ribs are arranged at the bottom ends of the four anti-floating plates. Four supporting ribs are arranged between the two fixing frames, steel balls are arranged at one ends of the four supporting ribs, four wrapping plates are arranged between the inner walls of the two fixing frames, a plurality of side plates are arranged on one sides of the four wrapping plates, and an anti-floating plate, the supporting ribs, the steel balls, the fixing columns and first cast iron pipes are arranged, so that the anti-floating plate and the steel balls are connected through the supporting ribs; the two steel balls are located on the two sides of the fixing frame correspondingly and suitable for the environment where water flow is strong and the environment can be affected by buoyancy, the gravity of the prefabricated calandria body can be enhanced through matched use of the first cast iron pipes and the four steel balls, the prefabricated calandria body can be kept at the preset position, and it is ensured that the prefabricated calandria body cannot float upwards due to external force.

The utility model discloses a transportation adjusting bracket for a pressure steel pipe of a pump station, and relates to the technical field of bracket devices. The device comprises a first base and a second base, the first base and the second base are symmetrically arranged, the first base and the second base are arranged in an I shape, lead screws are rotationally arranged at the two ends of the top of the first base, and the ends, away from the second base, of the two lead screws are jointly sleeved with a first belt. A first motor is fixedly arranged at the position, close to one lead screw, of the first base, and the output end of the first motor is coaxially and fixedly arranged on the lead screws. By arranging the adjustable lead screw and sleeve structure, the problem that the two ends of a long steel pipe are insufficiently supported due to the fact that an existing bracket can only adjust the position of the steel pipe to enable the supporting plate to be centered can be solved according to the actual length of the steel pipe, the adaptability to the steel pipes with different lengths is effectively improved, and the stability of the two ends of the steel pipe in the transportation process is guaranteed; and the toppling risk caused by the unstable two ends of the overlong steel pipe is reduced.

The present invention discloses a large-scale penstock intelligent transporter and its usage method, belonging to the field of special transportation equipment for water conservancy and hydropower projects. The transporter includes a tractor head, a trapezoidal trailer frame, a hydraulic system and an intelligent monitoring system. The rear axle drives a slewing mechanism through a hydraulic motor to achieve a 90° rotation. During loading and unloading, the tire axis is parallel to the vehicle body to enter the inside of the penstock, and it is locked in a vertical state during transportation; the front / rear jacking mechanisms adopt double locking of hydraulic screws and hydraulic locks, and cooperate with a multi-directional jacking and fixing mechanism to ensure the stable lifting and anti-slip of the penstock. The loading and unloading method realizes single-person operation through the alternate jacking of auxiliary wheels, the slewing of the rear axle and intelligent guidance, greatly reducing the dependence on labor and the accident rate. The present invention solves the problems of complex loading and unloading, unstable fixing, and dependence on large machinery in the traditional transportation method, and has the characteristics of high efficiency, safety and strong adaptability, and is especially suitable for transporting large-scale penstocks with a diameter of 3-6 meters.

The invention provides an automatic construction process for mounting a pressure steel pipe in a straight section hole, belongs to the technical field of construction processes, and solves the technical problems of low construction efficiency and low safety. An automatic construction technology for installing a pressure steel pipe in a straight section hole comprises the following steps that firstly, two sets of embedded holes are dug in the unloading position in the hole, concrete is poured into the holes, the distance is determined according to the size of the steel pipe, and two sets of overhead anchors are taken out and fixed to the concrete; 2, the site is cleaned, sundries and obstacles in the site are removed, it is ensured that the site is flat and firm, the operation requirement is met, and the vehicle parking position and the hoisting operation area are reasonably planned according to the storage position of the steel pipe and the operation radius of a crane. According to the invention, automatic construction in the hole is realized, the personnel investment is reduced, the construction efficiency is improved, cameras and alarms are arranged on site, monitoring is carried out, alarm reminding is carried out, the installation safety is ensured, and the installation accuracy is improved.

The invention relates to a device suitable for assembling a thrust ring of a pressure steel pipe transition section, and belongs to the technical field of pressure steel pipe installation. In order to solve the technical problems that in the existing thrust ring installation process, positioning precision is low, manual adjusting efficiency is poor, and the thrust ring installation device is easily affected by the curvature of a pipe wall, an I-shaped steel footstock is adopted as a supporting foundation, a top plate is welded to the top of the I-shaped steel footstock to form a rigid frame, and a hydraulic jack abuts against the I-shaped steel footstock through a base and a power head acts on a thrust ring. A chain block is hung in a sliding groove of the top plate and connected with a hydraulic jack through a chain to achieve three-dimensional position fine adjustment, and moving wheels with locking mechanisms are installed at the bottom of the I-shaped steel top base to achieve overall displacement and construction positioning of the device. The hydraulic oil cylinder drives the jack to stretch out and draw back, the chain block is accurately adjusted, and the moving wheel is rapidly positioned, so that the millimeter-level installation precision of the thrust ring under the condition of a complex curved surface of a transition section is ensured.

The utility model relates to the technical field of pressure steel pipe transportation equipment, and particularly discloses a large-diameter pressure steel pipe flat car transportation supporting device. The bottom end of a first vertical mounting rod of the left supporting structure is connected to the left part of the supporting frame; one end of the first supporting arm is hinged to the front end of the left portion of the supporting frame. The second vertical mounting rod is arranged behind the first vertical mounting rod; the second supporting arm is arranged at the rear end of the left portion of the supporting frame. The right supporting structure is the same as the left supporting structure and arranged on the right portion of the supporting frame. The pressure steel pipes are supported through the supporting frame, the left supporting structure and the right supporting structure, and the stability of the transportation process is guaranteed; and after transportation is completed, the first supporting arms and the second supporting arms of the left supporting structure and the right supporting structure can be retracted to the position above the flat car, normal running of the flat car is not affected in a narrow road, and the transportation efficiency of the pressure steel pipes is improved.

The utility model discloses a buried water delivery pressure steel pipe disease inspection system, which relates to an inspection device and comprises a track fixed in a pressure steel pipe; the moving platform is movably arranged on the track; the video monitoring device is mounted on the mobile platform and is used for monitoring the interior of the pressure steel pipe; and the sub-vehicle is arranged on the mobile platform and can be separated from the mobile platform for independent inspection. By arranging the mobile platform, namely the mother vehicle, the track and the son vehicle carried on the mother vehicle, the detection of the interior of the water supply pressure pipeline can be realized, and the son vehicle can be separated from the mother vehicle to work independently, so that the part of the pipeline, which can be operated to be specially detected, can be detected; the detection efficiency is higher, the use requirement can be better met, the child trolley and the mother trolley can be recycled for multiple times after use, the device can be used on pipelines without manual detection conditions, and use is more flexible.

The utility model discloses a fixing device for girth welding of a combined section of a bent pipe of a pressure steel pipe, which comprises a first roller carrier trolley which is fixedly arranged, a second roller carrier trolley is arranged on the parallel opposite side of the first roller carrier trolley, and a trolley track is arranged between the first roller carrier trolley and the second roller carrier trolley. Trolley wheels are arranged on the lower side of the second roller carrier trolley and can roll on the trolley track; rollers are arranged at the two ends of the upper table top of the first roller frame trolley and the two ends of the upper table top of the second roller frame trolley, and thrust wheel sets are arranged on the inner sides of the rollers. The device has the advantages of being simple in structure, convenient to disassemble and stable and reliable in work, meanwhile, the service life of the device is greatly prolonged, and the fault rate and the accident rate are reduced.

The invention relates to the field of water conservancy and hydropower pressure steel pipe manufacturing, mounting and construction, in particular to a pressure steel pipe transportation steering method. Steering transportation of the pressure steel pipes is achieved through the specific pressure steel pipe steering transportation trolley, a lifting point does not need to be arranged at the top of a tunnel for suspended steering, and the construction environment is friendly; by the adoption of the pressure steel pipe steering transportation trolley, the same device can be adopted for in-hole transportation and steering operation before steering and after steering, multiple transportation devices are not needed, the construction procedure and construction cost of an engineering project are optimized, and the safety in the construction process is also improved. In addition, the trolley can be repeatedly used, and is good in economic benefit and good in generalization performance.

The invention discloses a combined installation method for embedded parts of a water turbine, and relates to the technical field of hydroelectric power stations. The water turbine embedded part combined installation method comprises the following steps that S1, a pressure steel pipe is installed; s2, mounting and fixing the seat ring; s3, a volute is correspondingly installed between the seat ring and the pressure steel pipe; s4, the adjusters are installed, the pressure steel pipe and the adjusters are subjected to full welding, the adjusters and the volute are welded, and welding circular seams are reserved; s5, fixing of the seat ring is relieved, and welding closing is conducted on a welding circular seam at the connecting position of the adjuster and the volute; s6, after the installation elevation and the horizontal deviation of the seat ring are determined and fine adjustment is carried out, the ring seat is fixedly installed; and S7, outer cladding reinforced concrete is poured. According to the combined mounting method for the embedded parts of the water turbine, the problem that the residual stress of the folding seam is large and cannot be effectively released during mounting of the adjuster can be effectively solved, the connecting quality after mounting of the adjuster is guaranteed, and potential safety hazards caused by mounting of the adjuster in the operation process of a power station are eliminated.

The invention discloses an integral structure, a design method and a construction method of a fixed pressure steel pipe. The overall structure comprises the reinforced concrete piles, the peripheral reinforced concrete structure and the pressure steel pipes, sliding of the pressure steel pipes is prevented through shearing resistance of the reinforced concrete piles and friction force between concrete and a foundation face, overturning of the pressure steel pipes is prevented through the combined effect of the piles and rock masses around the piles or a covering layer, and the effect of stabilizing the pressure steel pipes is achieved. Compared with a traditional anchor block which is large in size and complex in formwork erecting, the anchor block is more compact and light in structure, the corresponding formwork engineering amount is small, and the construction difficulty is remarkably reduced. The cast-in-situ bored piles or the rotary digging hole-forming cast-in-situ piles are adopted in a mature construction method, the construction process is standardized, the project quality can be guaranteed, and the construction efficiency can be improved.

The utility model discloses a variable-diameter multi-interval penstock ring rib externally-hung positioning device, and belongs to the technical field of water conservancy and hydropower. Comprising a vertically-arranged frame body, and attaching assemblies matched with the pressure steel pipe are arranged at the upper end and the lower end of the inner side of the frame body; a ring rib tray with the adjustable position is detachably installed on the inner side of the frame body. According to the utility model, the integral assembly of the pressure steel pipe ring ribs with variable diameters, various wall thicknesses and different intervals is realized; a plurality of ring rib trays are arranged, and a plurality of ring ribs of a single section of pressure steel pipe can be assembled at a time, so that the working efficiency is improved; a replaceable arc-shaped base plate is additionally arranged on the working surface of the electromagnetic chuck, so that the electromagnetic adsorption force when the outer diameters of different pressure steel pipes are attached is ensured.

The utility model provides a living water supply system for an auxiliary plant of a hydropower station. The living water supply system comprises a pressure steel pipe, a living water supply main pipe, a main pipe valve and instrument group, a coarse filter, a living water supply branch pipe, a small water treatment combined device, a low-water-quality-requirement water sanitary appliance, a high-water-quality-requirement water sanitary appliance and a pressure increasing and reducing unit. Wherein the living water supply branch pipes comprise a first living water supply branch pipe and a second living water supply branch pipe. According to the living water supply system for the auxiliary plant of the hydropower station, the existing water source water pressure resource of the hydropower station can be well utilized, and the living water supply system which is simple, high in flexibility, convenient to operate, maintain and manage, low in investment cost and suitable for the auxiliary plant of the hydropower station can be designed, so that the actual use requirement in engineering is met.

The present invention provides an installation device and method for pressure steel pipes in a deep vertical shaft of a hydropower station. The pressure steel pipes are welded and installed in the deep vertical shaft by a manned cage, which greatly improves the installation efficiency of the pressure steel pipes and avoids the need to continuously install and remove supporting platforms for auxiliary pressure steel pipe installation while installing the pressure steel pipes. The lifting mechanism can lift the manned cage in the deep vertical shaft as a whole. The manned cage includes a hanging mechanism, a fixed installation mechanism and a welding mechanism. The welding mechanism, the fixed installation mechanism and the welding mechanism are fixedly connected by a number of pillars, which improves the installation stability of the manned cage. The manned cage in the present invention has a simple structure, requires a single material, is easy and quick to manufacture, has strong operability and practicality, effectively ensures the installation efficiency of the pressure steel pipes, and thus reduces the installation cost.

The utility model relates to the technical field of underground gas storage gas transmission pipeline construction, and discloses a device for transporting pressure steel pipe tiles, which comprises a transportation trolley and a track, the group of rails are symmetrically arranged and extend from the outer part of the four-modification derrick to the lower part of the winch in the derrick; the transportation trolley comprises a trolley body of a rectangular frame structure and walking wheels installed at the four corners of the bottom of the trolley body, the trolley body forms a placing platform for the steel plate tiles, and a limiting assembly capable of limiting the steel plate tiles is further arranged on the rectangular frame structure of the trolley body. By means of the device for transporting the pressure steel pipe tiles, the steel plate tiles of an underground gas storage for manufacturing a gas conveying pipeline can be transported to the position beside a gas storage cavern vertical shaft, meanwhile, the device for transporting the pressure steel pipe tiles is not limited by the space of a modified derrick, and the steel pipe tile transportation problem is solved.

The invention discloses a buried pressure steel pipe stiffening ring integral rolling forming process, and relates to the technical field of pumped storage power station pressure steel pipe stiffening ring processing and manufacturing, and the buried pressure steel pipe stiffening ring integral rolling forming process comprises the following steps: S1, calculating the length and the width of a stiffening ring steel plate according to a design file, and designing a stiffening ring blanking drawing; s2, a numerical control cutting machine is adopted for conducting blanking and lofting on the stiffening ring steel plate, the slotting allowance is controlled, and it is guaranteed that the width of the cut straight steel plate meets the requirement for the width of the stiffening ring; s3, a rolling forming equipment starting switch is started, slow feeding is conducted till the end of the straight steel plate enters the rolling forming equipment, and then a rolling operation switch can be normally started; s4, the step S3 is cyclically operated until the rolling radian meets the size requirement required by design; and S5, the radian of the machined straight steel plate is detected. A straight steel plate is adopted for blanking, so that the material loss is reduced; the integral rolling method is simple and convenient to operate; and a whole circle or a semicircle is optimized, the number of butt joints is reduced, and welding residual stress distribution is improved.

The utility model relates to an automatic turnover device for manufacturing a tile of a pressure steel pipe, which solves the problem of turnover storage of the tile rolled by a plate rolling machine when the pressure steel pipe is manufactured. The upper ends of the two side-by-side vertical main supports are respectively connected with a bracket through a hinge device, one ends of the two brackets are provided with check blocks, the other ends of the two brackets are connected through a connecting rod, the connecting rod is provided with two counterweight hanging rings which are connected with the two ends of a balancing device through steel wire ropes, the balancing device is provided with counterweight blocks, tiles are arranged on the two brackets, and one ends of the tiles are connected with the check blocks. By increasing and decreasing balancing weights of the balancing device, stable turning over of the tiles and automatic resetting of the bracket are achieved.

The utility model relates to the technical field of water conservancy construction, in particular to a support frame for mounting a large-diameter steel pipe, which comprises a portal frame structure consisting of a cross beam and two support plates, an adjustable lifting device is hoisted on the cross beam, and a clamping component is mounted on the lifting device. According to the supporting frame for installing the large-diameter steel pipe, the support base can be adjusted according to the slope ratio of a slope, meanwhile, the problem that hoisting equipment such as a truck crane is limited is solved, the installation technology is optimized, and safe construction management is improved; the height of the pressure steel pipe is finely adjusted through the electric hoist or the chain hoist, the installation precision is guaranteed, after the pressure steel pipe is installed and fixed, slow force unloading of the supporting frame is completed by loosening the electric hoist or the chain hoist, and the situation that the installed pressure steel pipe deforms after sudden force unloading, and the installation quality is affected is avoided.

The utility model discloses a double-lug-handle type hydraulic turbine steel pipe manhole door compression bolt stretching support which comprises a bearing beam (1), jacks (2) perpendicular to the bearing beam (1) are arranged on the two sides of the upper end of the bearing beam (1), a plurality of sets of balance beam supporting rods (3) perpendicular to the bearing beam (1) are arranged in the middle of the bearing beam (1), and balance beams (4) are arranged at the upper ends of the balance beam supporting rods (3). Ear handles (5) are symmetrically arranged in the balance beam (4), a guide seat (6) is arranged between the balance beam supporting rods (3), and a dial indicator support (7) capable of moving relative to the guide seat (6) is arranged in the guide seat (6). In the process of pulling the manhole door to move stably, the sealing threshold value of the manhole door can be detected, and leakage caused by failure of rubber on the manhole door due to the fact that the manhole door is pulled too tightly is avoided.

The invention discloses a corrugated expansion joint structure for a pressure steel pipe with a large HD value. Comprising pressure steel pipes located at the front end and the rear end of the corrugated expansion joint structure respectively, an expansion joint front connecting section welded and sealed to the rear portion of the pressure steel pipe at the front end, an expansion joint rear connecting section welded and sealed to the front portion of the pressure steel pipe at the rear end, and an inner flow guide sleeve welded and sealed to the expansion joint front connecting section. The inner flow guide sleeve and the outer flow guide sleeve are in lap joint oppositely, an axial telescopic gap is reserved between the inner flow guide sleeve and the outer flow guide sleeve, and a water stop corrugated pipe is arranged on the outer sides of the inner flow guide sleeve and the outer flow guide sleeve and between the telescopic joint front connecting section and the telescopic joint rear connecting section and used for connecting the inner flow guide sleeve and the outer flow guide sleeve in a sealed mode. The outer side of the water stop corrugated pipe is sleeved with a fence plate assembly capable of stretching and retracting in the axial direction, and the inner side of the water stop corrugated pipe is provided with an outwards-protruding wave reinforcing ring for supporting wave crests of the water stop corrugated pipe. And the use limitation that the thickness of the corrugated pipe plate must be increased along with the increase of the HD value is solved.