74results about How to "Improve engineering adaptability" patented technology

The invention discloses a forest rocket detecting and identifying method and apparatus based on the video image intelligent analysis. the method includes: setting the mask parameter in advance for the fixed interference region in the video monitor scene in order to eliminate the interference of the fixed interference region for the rocket identification; collecting the video image about the video monitoring scene; judging the video monitoring scene is in the daytime or the night according to the luminance value of the video image; if the video monitoring scene is in the daytime, conducting the daytime rocket detecting and identifying process for the video image of the mask by utilizing the mask parameter to obtain the smoke and fire region related identification; if the video monitoring scene is in the night, conducting the at-night open flame detecting and identifying process for the video image of the mask by utilizing the mask parameter to obtain open flame region related identification. the forest rocket detecting and identifying method and apparatus provided by the invention can improve the forest rocket detecting and identifying sensitivity and accuracy.

The invention belongs to the field of power systems, in particular to a reactive-load compensation equipment application scheme for large-scale wind power delivery system. As for the large-scale wind power delivery system, the invention, aiming to meet the needs of power delivery and wind power access, through reactive power balance analysis in different level years and under different operation modes, provides the capacitive and inductive reactive power demands of each substation in the system, and provides a configuration scheme for low pressure side fixed switching reactive compensation equipment such as capacitors, reactors and the like and dynamic reactive-load compensation equipment such as controllable reactors, static var compensators and the like. The provided configuration scheme can ensure voltage at each point in the system is controlled within a reasonable range under different operation modes, and meanwhile the dynamic reactive-load compensation equipment can meet the requirements of reactive power control of the grid and the voltage under wind power fluctuations with a strong engineering adaptability.

The invention relates to a system and method for detecting a fault of a DC grounding electrode line, and the system and method achieve the fault discrimination and range finding of the DC grounding electrode line. The system comprises a high-voltage reactor, a high-voltage capacitor, an impedance matching module, an overvoltage protection module, a fault detection device, and a connection cable. The fault detection device can transmit a common mode pulse signal and a differential mode pulse signal, and the common mode pulse signal and the differential mode pulse signal are injected into two conductors of the DC grounding electrode line through the impedance matching module and the high-voltage capacitor. Moreover, a fault reflection traveling wave is detected through the above loop. The high-voltage reactor is disposed at a split part of the grounding electrode line so as to prevent a DC field from affecting a common mode signal traveling wave. The system can reduce the mutual counteracting of differential mode signal traveling waves, and also can enable a differential mode traveling wave method not to be limited by an installation site. The method can improve the amplitude and signal to noise ratio of the traveling wave signals, and can improve the reliability and range finding precision of fault detection of the DC grounding electrode line.

The invention discloses a high-flow high-frequency-response digital valve capable of rotating and being controlled in parallel. The digital valve is composed of a valve body, a valve sleeve, a left servo motor, a right servo motor and the like. The valve sleeve is arranged in the valve body in a rotation mode, and a valve core is installed in the valve sleeve in a rotation mode. Valve holes for high-pressure oil or low-pressure oil to pass through are formed in two ends of a valve core shaft, the valve holes are matched with spiral grooves formed in corresponding positions on two sides of the valve sleeve, and axial moving of the valve core is achieved by controlling the pressure in cavities on the left side and the right side of the valve core. The right servo motor drives the valve core to rotate, the left servo motor drives the valve sleeve to rotate, bi-directional rotation is achieved through parallel control of the valve core and the valve sleeve, and frequency limit caused by the fact that only the valve core rotates in a traditional valve is broken through. Spiral groove mechanisms with different spiral lead angles are formed in the valve sleeve, valve core rotation is changed into the axial moving, and a function of multi-stage gaining is achieved. By means of parallel connection rotation and digital control of the valve core and the valve sleeve and by means of the spiral groove array structure with the multi-stage gaining function, high flow and high frequency response of the servo valve and precise control of a terminal position are achieved.

The invention relates to an environment-friendly curing agent for stabilizing soil, which can improve the bearing capacity of a subgrade. The curing agent for stabilizing the soil is characterized by comprising the following components in parts by weight: 2-18 parts of polyanionic cellulose, 2-6 parts of sodium sulfate or calcium sulphate, 12-50 parts of sulfonic acid, 2-53 parts of granulated blast furnace slag, 1-5 parts of neutral water glass and 38-150 parts of water. The curing agent for stabilizing the soil can remarkably improve the bearing capability of the cured soil and has good antiseepage effect and durability, and the situation of argillization can be reduced after the curing agent is soaked in the water; therefore, the environment-friendly curing agent is suitable for various construction pavements, in particular rural roads developed for travel and agriculture with the requirements of low cost, short construction period and fast effect. The environment-friendly curing agent not only improves the road construction quality, but also makes the material application and the construction process more environment-friendly, can be further applied to the base course and surface course of road and construction engineering and the fields of wind prevention and sand consolidation, canal seepage control, burning-free low-carbon environment-friendly bricks and the like, and is suitable for the semimechanical operation and the large-scale mechanical construction operation in country.

An external sunshading shutter device comprises a blade angle fixing frame, shutter blades, a blade opening-closing fixing frame, a blade angle control structure and a blade opening-closing control structure. One end of the blade angle control structure and one end of the blade opening-closing control structure are both fixed to the left end and the right end of each shutter blades. The angle control structure comprises a blade angle control motor, nylon drawing wires and angle control connecting components, and the blade opening-closing control structure comprises a blade opening-closing motor driving rotary shaft, a driven rotary shaft, a variable-section linkage strap and opening-closing control connecting components. The nylon drawing wires are used for tensioning to control blade angles, the blades are reset by means of elasticity of a tensional spring, and closing of the blades one by one from bottom to top is realized by means of the variable-section linkage strap. Angles and opening-closing of the blades are controlled by two motors respectively, three states of full-open, full-closed and upper-closed lower-open of the shutter blades can be realized, the problem of contradiction between sun-shading and lighting is solved, and sun-shading by the upper portion, lighting by the lower portion and energy saving and consumption reduction are realized.

The invention discloses a double-wire system special module, which aims to provide a double-wire special module with simple wire connection and powerful functions to reduce the use cost of conducting wires, is compatible with passive feedback and active feedback of the action of fire fighting equipment, and realize the detection to open-circuit and short-circuit faults of lines. The key points of the technical proposal of the special module are as follows: the special module consists of an active feedback detection circuit, a passive feedback detection circuit and a start-stop circuit, and the special module and a fire alarm control part are connected through the two conducting wires. With the same construction distance, the double-wire system special module saves 33 percent, 50 percent and 60 percent of conducting wires respectively compared with a three-wire system special module, a four-wire system special module, and a five-wire system special module; the double-wire system special module is compatible with two feedback inputs, namely the active feedback and the passive feedback, has strong engineering adaptability, and realizes the feedback to the open-circuit and short-circuit faults of the lines; a single module can control the start / stop of the fire fighting equipment without self locking, and can also control the start / stop of the fire fighting equipment with self locking; and the double-wire system special module has strong anti-surge capacity of circuits.

The invention discloses a 3D and isogeometric mixed unit modeling method of a rifling barrel. The rifling barrel is divided into a rifling and a barrel body, an isogeometric unit is used to establish the rifling structure, a Lagrange finite element mesh of the barrel body is obtained by utilizing discrete finite elements. In the isogeometric unit of the rifling, Lagrange transformation is carried out on a connecting curved surface cooperated with the barrel body so that the rifling is effectively connected with the barrel body. The connecting curved surface is a curved surface shared by the rifling and the barrel body. Unit nodes whose coordinates are the same are removed from a model after connection, and nodes are marked again to obtain a complete isogeometric and 3D mixed unit model of the rifling barrel. According to the isogeometric and 3D mixed unit model of the rifling barrel, the accurate geometric shape of the rifling is reserved, more accurate results can be obtained by simulating calculation, and the barrel body can use a mature finite element frame to reduce the modeling time.

The invention relates to a high speed railway subgrade compaction index lossless calculating method. On the premise that a built subgrade is not damaged, compaction indexes including K, K30, EVd and the like inside the subgrade are effectively obtained. The method includes the following steps that (1) heavy dynamic touch testing is developed in the center of a subgrade face layer in the vertical direction, and the hammering number N63.5 at different vertical depths H below the subgrade face layer are measured; (2) the subgrade compaction indexes including K, K30 and EVd are determined according to the following formula, and please see the specification for the formula; and (3) holes formed due to the heavy dynamic touch testing in the step (1) is subject to cement mortar or medium-coarse sand backfill compaction.

The invention discloses a mounting base for GIS equipment. A plurality of anchor reinforcing steel bars are welded on strip-shaped plates; supporting plates are welded on bottom surfaces of at least two anchor reinforcing steel bars on each strip-shaped plate; the two strip-shaped plates are arranged on a profiled steel plate in a mutually parallel mode through the corresponding supporting plates;the strip-shaped plates, the anchor reinforcing steel bars, the supporting plates and the profiled steel plate are pre-embedded into an embedded part layer; a plurality of steel beams are arranged above the two strip-shaped plates; two rigid piers are welded on each steel beam; the steel piers at the two ends of each steel beam are correspondingly welded on the two strip-shaped plates; and the steel beams and the rigid piers are arranged in an soil surface layer. According to the mounting base for the GIS equipment disclosed by the invention, processes such as GIS room floor pouring and curing are lagged behind equipment manufacturer data, so that advanced construction is realized, a transformer substation construction period can be effectively shortened, and steel abutments of proper height are selected in a medium-soil surface layer in practical engineering, and therefore, engineering adaptability is strong; and holes are formed in the steel beams for allowing soil-surface layer reinforcing steel bars and pipelines to pass through, so that a concrete layer in the soil-surface layer is prevented from being cracked.

The invention discloses a pre-stressed assembling structure of prefabricated concrete duct pieces for a well-sinking type bridge substructure. The pre-stressed assembling structure comprises a main body of the bridge substructure, the main body of the bridge substructure is spliced by splicing layers layer by layer, and the splicing layers are formed by connecting the prefabricated concrete duct pieces end to end. The prefabricated concrete duct pieces in the same layer of the splicing layers are connected through horizontal pre-stressed high-strength bolts, and the prefabricated concrete ductpieces of every two adjacent splicing layers are connected by vertical pre-stressed high-strength bolts; and concrete duct piece joints are formed between the prefabricated concrete duct pieces in the same layer of the splicing layers, and elastic sealing gaskets are arranged in the concrete duct piece joints. A method comprises the steps that basic pre-treatment of a construction location is performed; pouring and curing of the prefabricated concrete duct pieces are performed in a precast plant; the prefabricated concrete duct pieces are connected with the horizontal pre-stressed high-strength bolts on shore to form the splicing layers, and the joints are filled with water-swelling materials; and after water is discharged in a sinking well, the water is pumped and installation is performed in the well.

The invention discloses a disconnecting link state collecting device, which comprises a detecting sensor and an inductive attachment. A detecting sensor shell has a long strip structure and can be bent for deformation. The detecting sensor includes two magnetic sensing devices and a state collecting and output module; and the magnetic sensing devices are Hall elements and each magnetic sensing device corresponds to one position state. The magnetic sensing devices are connected with the state collecting and output module by wires. The state collecting and output module outputs a disconnecting link state signal after processing, wherein the signal output mode can be a hard contact mode or a communication mode. The inductive attachment includes an induction bracket and a permanent magnet-magnet steel; the induction bracket has a strip structure and the length and angle adjustment is made based on the actual structure and position of the disconnecting link; and the induction bracket is fixed at a disconnecting link mechanism by screws or hoops or a pasting way. The device has advantages of high detection precision, high safety and reliability, and strong engineering adaptability.

The invention discloses a prefabricated pile with external hoops and filled with sand-gravel aggregates, and a construction method thereof. A section-shaped spaced diameter-expanded pile body is formed through connecting the external diameter-expanding hoops of a pile body and pile-bottom-expanding pile tips with the pile body after the prefabricated pile is formed. The sand-gravel aggregates are filled in the periphery of the pile while the prefabricated pile with the external hoops is pressed or punched in foundation soil, and finally a composite foundation in which the prefabricated pile with the external hoops, the sand-gravel fillers in the periphery of the pile, and the foundation soil co-act is formed. In the method, the sand-gravel fillers in the periphery of the pile form a water drainage channel, a soil mass consolidation process is accelerated, and post-construction settlement after construction is completed is controlled; a larger soil mass internal friction angle of the sand-gravel aggregates provides higher pile side friction resistance of a pile foundation, thus the bearing capacity of the pile foundation can be improved; and each external hoop comprises a diameter-expanding hoop of the pile body and a pile-end-expanding pile tip. The equipment is simple, independent die customization is not required, and a fixing position on the pile body is adjustable, thus the prefabricated pile is adaptive to many designs and working conditions, and high in engineering adaptability; and the spaced diameter-expanded pile body is capable of providing bearing capacity higher than the bearing capacity of a prefabricated pile having an outer diameter which is the same as that of a diameter-expanded section, and capable of saving the manufacturing cost, thus achieving good economic benefits.

The invention discloses a design method of an aero-engine acceleration control rule. The design method of the aero-engine acceleration control rule comprises the following steps: 1, obtaining the maximum rotating speed difference value; 2, randomly selecting n rotating speed points between the highest stable operation rotating speed and the lowest stable operation rotating speed; 3, dividing an acceleration process into n+1 stages according to the rotating speeds; 4, distributing tj1, tj2, tj3, and the like, tj(n+1) to all the stages; 5, listing the rotating speeds and the corresponding time points which are obtained in the step 3 and the step 4 into arrays; 6, fitting a curve through all points obtained in the step 5; 7, obtaining a rotating speed deviation within a time period from 0 to tj; and 8, showing the universal acceleration control rule at the acceleration time of tj as follows: shown in the specification. The design method of the aero-engine acceleration control rule has the advantage that a method for not taking the oil supply amount of a main combustion chamber as a control target is adopted, so that the dependency of an acceleration process on the control accuracy of the oil supply amount of the main combustion chamber is reduced.

The invention discloses a rod type convergence gauge and a using method of the rod type convergence gauge. The rod type convergence gauge is mainly formed by connecting a light metal measuring rod, a main measuring and reading rod, a fixing anchor head, a measuring point fixing anchor head and the like. The light metal measuring rod and the main measuring and reading rod are seamlessly connected in a butted mode through a connecting bolt and a connecting nut, and the main measuring and reading rod is mainly composed of a hollow rod body, an internal hidden steel measuring tape, a spring, a metal pressing rod, a locking device, a micrometer caliper, a force measuring spring and a reference window. After the components of the convergence gauge are connected, the measuring tape hidden in the main measuring and reading rod is drawn out, the internal hidden spring is pressed in the process of drawing out the measuring tape, the convergence gauge is tensioned at the same time, then, a measuring tape locking ring is screwed down, and a rough read number is recorded; next, the micrometer caliper connected to one end of the main measuring and reading rod is rotated and meanwhile the force measuring spring is pressed, when the scale mark on a guide rod of the force measuring spring coincides with the scale mark on the reference window arranged on the measuring rod, it is shown that the tensile force is regulated to be accurate, the mantissa is accurately measured and read, and the measuring value can be obtained by adding the mantissa to the rough read number. The rod type convergence gauge has the advantages of being simple in structure, convenient to operate, high and stable in measuring accuracy and high in applicability.

The invention discloses a ground anchor which comprises a ground anchor rod. A force exerting part and a counter-force loading device are arranged on the upper portion of a ground anchor rod body. The counter-force loading device exerts up-pulling force on the ground anchor rod through the force exerting part, and transmits counter force of the up-pulling force to the lower portion of a counter-force loading device body. The invention further discloses a counter-force loading type soft foundation prepressing treatment method by utilizing the ground anchor. The method includes the following steps that a steel plate with a central reserved hole is arranged on the ground of an area to be treated, the ground anchor penetrates through the central reversed hole of the steel plate, drilling is conducted, and the bottom of the ground anchor rod is enabled to penetrate through or basically penetrate through a soft soil layer of the treated area; and a gasket is screwed on a threaded section through a nut, a spring is compressed, and the steel plate on a foundation is subjected to prepressing loading by means of the spring through the counter force of the up-pulling force exerted on the ground anchor rod. Soil sources do not need to be stacked and loaded, and the foundation instability problem caused by the ultrahigh stacking and loading speed can be avoided. The ground anchor and the steel plate are flexible in plane arrangement, and good engineering adaptability is achieved.

The invention discloses a heat exchanger with a nonmetal heat exchange tube bundle. The heat exchanger comprises a front tube box, a rear tube box, the nonmetal heat exchange tube bundle and a housing, wherein the nonmetal heat exchange tube bundle is mounted in the housing; supports are arranged at the lower part of the housing; a second fluid outlet and a second fluid inlet are formed in the housing; the two ends of the housing are connected with the front tube box and the rear tube box by flanges respectively; a front tube plate and a rear tube plate of the nonmetal heat exchange tube bundle are clamped by the flanges, the front tube box and the rear tube box that are connected with the two end parts of the housing respectively; sealing gaskets are arranged between contact surfaces; a partition plate is arranged in the front tube box; a first fluid inlet is formed in the upper part of the front tube box; a first fluid outlet is formed in the lower part of the front tube box; and the partition plate is arranged between two adjacent nonmetal heat exchange tubes. By virtue of the technical scheme, the heat exchanger is corrosion-resistant, realizes the effect of long-period stable operation, has the advantages of tightness in sealing and high pressure bearing capacity, is applicable to air-liquid heat exchange occasions, and is simple in structure and low in manufacturing cost, and the overall manufacturing automation and mass production of the heat exchanger can be realized easily.

The invention discloses a synchronous control method of the motion of a combined supporting mechanism of a wind tunnel. First, a tail supporting mechanism is identified as an active control object, and a stripe hanging supporting mechanism is identified as a follow-up control object; second, the characteristics including dynamic response time difference, motion speed and the like of the two independent supporting mechanisms in the combined supporting mechanism are tested and data of the characteristics are recorded; finally, the effect that the auxiliary supporting mechanism follows the main supporting mechanism in real time is achieved through sequential control of instructions, and corresponding safety strategies are adopted to cope with risks likely to exist in the process of a test, so that the test suffers no risk at all. The synchronous control method has the advantages that through the synchronous control over the two independent supporting mechanisms, combination supporting of an aircraft model is achieved, and a new test technology is provided for an aerodynamic test of the aircraft model in the wind tunnel; the method is good in operability, strong in engineering adaptability and high in safety and can meet special requirements in the technical field of wind tunnel supporting interference tests, greatly save equipment development expenditure and shorten the development period.

The invention relates to a pre-stressed anchor cable and drain plate combined pre-compaction device. The pre-stressed anchor cable and drain plate combined pre-compaction device comprises a pre-stressed anchor cable and a reaction frame. The pre-stressed anchor cable comprises an anti-pull anchor head, a steel strand and a fixing end. The anti-pull anchor head penetrates into a supporting layer ofa foundation. The upper end of the anti-pull anchor head is connected with the lower end of the steel strand. The outer side of the steel strand is sleeved with the plastic drain plate. A sand cushion is arranged above the plastic drain plate. The upper end of the steel strand is connected with the fixing end. The fixing end is fixed into a central reserved hole of the reaction frame. The reaction frame comprises a concrete face, a reaction frame base, a cross beam and a jack. The concrete face is located on the sand cushion. The reaction frame base is located on the concrete face. The jacksserve as stand columns of the reaction frame. The bottom of the cross beam is connected with the jacks. The pre-stressed anchor cable and drain plate combined pre-compaction device has the beneficialeffects that the reaction frame is lifted by the jacks so as to provide uplift force, so that the pile-loading process is simplified; or the pre-stressed anchor cable and drain plate combined pre-compaction device can be used in combination with a preloading device, and thus, the pile-loading quantity required for design is greatly reduced.

The invention relates to a rotary drilling construction method relating to deep concrete blocks and a gravel layer. According to the construction method, firstly, preparation for construction is made,preparation for drilling is made, and when drilling is performed to backfill concrete blocks in a deep layer and the gravel layer, a sand fishing drill bit is replaced with a spiral drill bit to stirand loosen gravels with larger particle sizes and break the concrete blocks with larger sizes; then the spiral drill bit is replaced with a cutting pick hard rock coring drill bit to advance in the gravel layer, and then through pressurizing by a drilling machine, broken stones and gravels compacted on the side wall of a drilled hole are completely taken out of the drilled hole; and finally the cutting pick hard rock coring drill bit is replaced with the sand fishing drill bit for continuously drilling to finally achieve hole forming. The invention further provides special rotary excavating and drilling equipment relating to the deep concrete blocks and the gravel layer. The special rotary excavating and drilling equipment comprises a rotary drilling rig, a main winch, a power head, a drill rod and drill bits, and the drill bits include a rock spiral cone drill bit, the cutting pick hard rock coring drill bit and the sand fishing drill bit. The different drill bits are replaced according to geological requirements, and drilling construction of a complex stratum structure is smoothly conducted.

The invention discloses a compact six-freedom-degree accurate tracking and pointing device for a satellite load, and the device is formed by the series connection of an upper platform and a lower platform in a normal direction of an installation surface. The upper platform comprises a pointing interface assembly, an adjustment interface assembly, six sets of drive assemblies, an upper platform control single-chip microcomputer, and an upper platform compressing and releasing device. The upper platform comprises an adjustment assembly, a lower platform compressing and releasing apparatus, a fixed plate, and a lower platform control single-chip microcomputer. The device can avoid the interference in a tracking and pointing work space under the cooperation of the upper and lower platforms, and meets the demands of the large-range and large-angle continuous precise follow-up tracking and orientation locating of a satellite effective load. The device can effectively reduce a motion envelopespace of the device through extending the work space of the upper platform through the lower platform, achieves the compact design, and saves the satellite space resources. The tracking and pointingdirection can be any one direction of the six degrees of freedom, and the device can flexibly achieve the full-airspace and full-disc tracking and pointing of the satellite effective load.

The invention provides an elastic wind-resistant supporting system. The elastic wind-resistant supporting system comprises a gutter, a horizontal supporting truss and a roof beam, the horizontal supporting truss and the gutter are arranged on the roof beam in parallel, and the gutter is located on the outer side of the horizontal supporting truss; and the elastic wind-resistant supporting system further comprises a plurality of elastic connectors, the two ends of each elastic connector are correspondingly connected with the horizontal supporting truss and the gutter, and the elastic connectorsare sequentially distributed between the horizontal supporting truss and the gutter at intervals in the length direction of the gutter. According to the elastic wind-resistant supporting system, thegutter on the outer side is connected with the supporting truss through the elastic connectors to form a horizontal elastic wind-resistant structure system, the horizontal wind load of the gutter is directly transmitted to the horizontal supporting truss through the elastic connectors, as the horizontal supporting truss has high horizontal bearing capacity, the beneficial working conditions that the horizontal supporting truss can resist the wind, and independent wind resisting of the gutter is avoided can be achieved, the bearing energy efficiency of the gutter is optimized, the steel consumption of the gutter can be significantly reduced, the installation of the system is simple, and the adaptability is higher.

The present invention belongs to the field of electric power systems, and in particular, relates to an application solution for a reactive compensation device of a large-scale wind power transmission system. Aiming at a large-scale wind power transmission system, taking the satisfaction of the demand for power transmission and wind power integration as an objective, and by means of the reactive balance analysis under different operation modes in different level years, proposed are capacitive and inductive reactive demands of each transformer station in the system, and also proposed is a configuration solution of a low-voltage side fixed switching reactive compensation device such as a capacitor, a reactor and the like, and a dynamic reactive compensation device such as a controllable reactor, a static reactive compensator and the like. The proposed configuration solution can ensure that the voltage at each point of the system is controlled within a reasonable range under different operation modes, while a dynamic reactive compensation device can satisfy the reactive control requirements for the grid voltage during wind power fluctuations, and has a very strong engineering adaptability.

The invention discloses a forest rocket detecting and identifying method and apparatus based on the video image intelligent analysis. the method includes: setting the mask parameter in advance for thefixed interference region in the video monitor scene in order to eliminate the interference of the fixed interference region for the rocket identification; collecting the video image about the videomonitoring scene; judging the video monitoring scene is in the daytime or the night according to the luminance value of the video image; if the video monitoring scene is in the daytime, conducting thedaytime rocket detecting and identifying process for the video image of the mask by utilizing the mask parameter to obtain the smoke and fire region related identification; if the video monitoring scene is in the night, conducting the at-night open flame detecting and identifying process for the video image of the mask by utilizing the mask parameter to obtain open flame region related identification. the forest rocket detecting and identifying method and apparatus provided by the invention can improve the forest rocket detecting and identifying sensitivity and accuracy.

The invention discloses a drilling tool without a drilling rod, which comprises a drill bit which is connected with an elastic pressurization mechanism which is used for providing driving force, drilling pressure and drilling process for the drill bit; the elastic pressurization mechanism is fixedly connected with a supporting device which is used for supporting the whole drilling tool and offsetting countertorque; since the invention changes the structure of current drilling tools thoroughly and adopts the specially-designed elastic pressurization mechanism and the supporting device; in a drilling machine without a drilling rod, a section of structure similar to the drilling rod of a traditional drilling machine is arranged between the drilling tool without the drilling rod and the supporting device thereof; a motivation driving device of the drilling tool without the drilling rod is integrated with the drill bit as one; when the drilling depth is changed, the length of the 'drillingrod' is not changed significantly; the structure not only can reduce the deformation of the drilling rod and ensure the quality of the drilling holes, but also can decrease the power consumption of the drilling tools and improve the rock-breaking capacity of the drill bit. The maximum drilling depth is no longer an important parameter for the design, and the adaptability of the drilling machine to a project is enhanced.

The invention belongs to the technical field of slope protection, and discloses a waterproof protection slope. The waterproof protection slope comprises an expansive soil slope, a slope top protection table, a slope toe protection table, a polymer waterproof layer, an ecological protection layer and a water guide channel. A solidification layer is formed on the surface layer of the expansive soil slope through a soil solidification agent; the slope top protection table is arranged on the slope top of the expansive soil slope; a slope top intercepting ditch is formed in the slope top protection table; the slope toe protection table is arranged on the slope toe of the expansive soil slope; a slope toe drainage ditch is formed in the slope toe protection table; the polymer waterproof layer is formed by combining one or more of waterproof coatings or cast-in-place coiled material waterproof layers; the polymer waterproof layer is laid on the surface of the solidification layer; the ecological protection layer is laid on the surface of the polymer waterproof layer; the water guide channel is formed in the ecological protection layer; and water in the slope top intercepting ditch can be guided to the slope toe drainage ditch. According to the waterproof protection slope, the polymer waterproof layer can reliably protect the expansive soil slope, and stress generated by expansive soil slope deformation can be buffered and released.

The invention discloses a grid cage against coastal erosion and a construction method of the grid cage. The grid cage comprises geogrids, the bottom ends of the geogrids are fixed in seabed soil, geotextiles are arranged in the geogrids, and the geogrids are connected through geotechnical ties. The construction method comprises the following steps that (a) geological exploration is carried out, and a grid cage arrangement route is determined; (b) the geotextile are bound on the inner sides of the geogrids to form a single geogrid cage; (c) a valve cage shoe is fixed on the inner edge of a gridcage sleeve mould and pressed into the seabed soil; (d) the grid cage is vertically lifted, positioned and pressed into the grid cage sleeve mould, and is pulled out after being arranged; (e) adjacent grid cages on the lowest water level line are bound; and (f) the steps (c)-(e) are repeated till the coast line to be protected is fully covered. The grid cage is low in engineering cost, good in corrosion resistance and aging resistance and fast and convenient to construct, and the flexible grid cage can be suitable for arbitrary buckling coast lines and has strong engineering adaptability.

The invention relates to the technical field of power supply and distribution, in particular to a DC power supply and distribution structure. The structure comprises a control terminal, a DC cabinet,a bipolar DC bus and DC electric appliances, and the bipolar DC bus comprises a DC positive line, a DC neutral line and a DC negative line. The DC electric appliances are connected between the DC positive line and the DC neutral line, between the DC negative line and the DC neutral line and between the DC positive line and the DC negative line, wherein the DC positive line, the DC negative line and the DC neutral line are connected to the DC cabinet, and the control terminal is in signal connection with the DC cabinet. A two-pole three-wire system DC bus is adopted in the invention, and loadsare symmetrically arranged, so the voltage drop of the DC neutral line can reach zero at the minimum, the transmission distance is equivalent to that of a single-pole voltage-doubling two-wire system,and the engineering adaptability is extremely high, that is, the power supply voltage of an electric appliance is low, and electricity utilization is safer; the positive and negative poles of the DCelectric appliances are arranged in a staggered mode, thereby achieving the double-bus mutual backup, and avoiding the serious consequence that an existing single-bus scheme has a single-bus fault, and consequently all-road-section lamp turning-off is likely to happen.