54results about How to "Reduce Engineering Accidents" patented technology

The invention discloses a multi-stage perforating pressurizing device. The device comprises a power shell and a pressurizing shell positioned on the lower part of the power shell, wherein a power cavity is formed in the power shell; a pressurizing cavity is formed in the pressurizing shell; the power cavity is communicated with the pressurizing cavity; a diaphragm igniter and a pressurizing gunpowder mechanism positioned on the lower part of the diaphragm igniter are arranged in the power cavity; a pressurizing piston driven by power generated by the power cavity is arranged in the pressurizing cavity and is connected with a piston through a push rod; and the piston is fixed on an intermediate joint through a shear pin. The stability and controllability of pressure generated by the combustion of gunpowder in the pressurizing cavity can be ensured; the pressure is applied to the pressurizing piston, so that the pressurizing piston moves stably; pressure increment is generated in an interlayer oil pipe, so that a next stage pressure initiation device and a next stage perforating gun are reliably detonated; and the multi-stage perforating pressurizing device is used for the pressure multi-stage perforating process, is suitable for various well conditions, and particularly can meet the requirements of a high-inclination well and a horizontal well on multi-section, large-distance and negative pressure perforating.

The invention discloses a pile sinking method for a hollow preformed pile. The method is as follows: a pile point is arranged on the end part of the hollow preformed pile at first and then the hollow preformed pile is placed on a pile driver; after the pile drive is in place, the pipe is rapidly pressed and passes through a miscellaneous fill layer; when the pile is pressed continuously, soil is taken out from the inside of the pile point; soil obtaining is stopped when the height is 0.5 to 1.0 meter away from the designed scale height; and finally the pile is pressed continuously until the designed scale height is reached. By adoption of the method to arrange the pile point on the end part of a static pressure preformed pile, the pile point has three functions of soil cutting, as a mixer and as a soil extruding controller. The soil is taken away through a hollow body of the pile by using high-pressure water or slurry to convert the soil into the slurry in the pile point (the mixer). By conversion of a common soil extruding preformed pile into a 'soil extruding-non-soil extruding' controllable pile, the method greatly reduces the resistance for pressing the pile, widens the application scope, has stable quality, and is pollution-free. Moreover, the method can save the investment and reduce engineering accidents under certain geological conditions.

The invention discloses a control system of a logging drilling sidewall coring tool. The control system comprises a drilling coring ground control box, a winch depth device, a variable frequency power source, a downhole instrument circuit part and a downhole instrument hydraulic part, wherein data acquisition and feedback control are performed on the coring tool through the drilling coring ground control box, various states of a downhole instrument can be detected in time through the downhole instrument circuit part, the power supply state of a downhole motor and the power supply state of the downhole instrument are monitored through a sensor, and the downhole motor can be adjusted and controlled by processing acquired data and controlling the variable frequency power source. According to a control method, automatic control over coring of the coring tool is achieved through the ground control box, an execution motor can be continuously started, a backup arm expands, the stretching displacement of a punch pin is minimal, the pressure of a second pump is maximal, a hydraulic motor rotates, a drill bit stretches out, the hydraulic motor stops rotating when the drilling displacement reaches the core breaking position, and a series of continuous actions that the core breaking drill bit retreats and is taken back is completed.

The invention discloses a device and a construction method suitable for adjusting a protective layer of a bridge pier column reinforcement. The device suitable for adjusting the protective layer of the bridge pier column reinforcement is arranged in a bridge pier column construction position; in the bridge pier column construction, steel reinforcement cages and a steel template are arranged in the bridge pier column construction; the steel template is horizontally arranged; the multiple steel reinforcement cages are arranged in an equally spaced manner; the steel reinforcement cages are perpendicular to to the steel template; the device suitable for adjusting the protective layer of the bridge pier column reinforcement is arranged at one end of the steel template and comprises a manual steel wire rope winch, a hand-cranking rod, a steel wire rope and a winch hook, wherein a bolt hole is formed in one end of the steel template; the winch hook hooks the bolt hole; one end of the steel wire rope is connected with the winch hook; the other end of the steel wire rope is wound on the manual steel wire rope winch; the hand-cranking rod is mounted in the central position of the manual steel wire rope winch; by pressing down the hand-cranking rod, the steel wire rope is enabled to drive the steel reinforcement cages to move to one side of the manual steel wire rope winch, and cushion blocks are additionally mounted on the steel reinforcement cages to adjust the steel reinforcement cages. The device suitable for adjusting the protective layer of the bridge pier column reinforcement has the advantages that the structure is simple, the implementation cost is low, the device is safe, convenient and fast, and the occurrence rate of engineering accidents can be reduced.

Cables are matched through a model selection unit according to actual demand data, the actual required laying distance of the cables and the actual required transmission quantity of the cables are obtained, cable demand grades are divided through a distance coefficient XL actual and a transmission quantity coefficient YC actual, and cable parameter data of the cables to be subjected to model selection are obtained; and cable performance coefficients Pi are obtained through a formula, performance grades of the cables are divided through comparison of the cable performance coefficients Pi and acable performance coefficient threshold, then the cable demand grades are matched with the performance grades of the cables in a one-to-one correspondence manner, after matching is finished, a model selection success signal is received through a verification module, and electrical data and mechanical data of the model selection cable are verified. The specification of the cable is determined according to actual requirements, the engineering cost is greatly saved, resources are saved, the working efficiency of engineering is improved, the construction period of the engineering is shortened, meanwhile, the cable quality is strictly controlled, and engineering accidents are reduced.

The invention discloses an automatic dust-fall spray control system for a tunnel, and a control method thereof. The system is composed of a dust sensor, a data processor, a control host, a cloud monitoring system and a water spraying device; through arrangement of a dust monitor in a tunnel operation area, a signal is transmitted to a control center and the cloud monitoring system; dust concentration warning values of at least two different levels are preset; when the dust concentration of a monitoring site reaches or exceeds the warning values of different levels set through the dust sensor,a solenoid valve of the water spraying device is controlled to open for spraying water to a workplace for dust fall; and through control over different opening degrees of the solenoid valve and different water flow rates corresponding to the warning values of different levels, dust of the workplace is reduced. According to the control system, through setting of multilevel warning thresholds, harmsare restrained at the embryonic stage; the system is improved through the process that the signal is transmitted to a water valve, and the purpose that different warning values correspond to different flow and flow rates for dust fall is achieved; and resources are saved, and targeted dust fall is performed.

The invention discloses an experimental system for researching dispersion characteristics of cohesive soil. The experimental system comprises a water tank, a bracket and a seepage chamber; the bracketcomprises a base, a plate, a first supporting rod and a second supporting rod; a winch and a fixed pulley are mounted on the plate; a winch rope is arranged on the winch and penetrates through the fixed pulley to be connected with the water tank; a first opening, a second opening and a third opening are formed in the lower portion of the water tank; a water inflow pipe penetrates through the first opening; an overflow pipe is arranged in the second opening; the lower portion of the third opening is connected with a water conveying pipe; thewater conveying pipe is provided with a water pump; afirst gravel layer, a first metal net, a sample, a second metal net and a second gravel layer are arranged in the seepage chamber; a conical cylinder is buried in the sample and communicated with thewater conveying pipe. Position adjustment and height positioning can be conducted on the water tank, water erosion of different scouring forces is achieved, the flow velocity is adjusted through thewater pump, water erosion of different flow velocities is achieved, and sample internal erosion experiments under different hydraulic load conditions can be conducted.