130results about How to "Timely support" patented technology

The invention relates to a super large mining height hydraulic support which comprises an opened rigid integrated base, wherein, two double-telescopic hydraulic upright posts are arranged on the base, and the upper ends of the upright posts are connected with a top beam; the rear of the top beam is connected with a screening beam; an edge protection device is connected with the telescopic beams which are in inner extension connection with the top beam; a balance jack is arranged between the top beam and the screening beam; the screening beam and the base are respectively connected with the front and rear connecting rods; a push jack is arranged on the base and is connected with a push rod; the front part of the top beam is provided with the telescopic beams, the middle part of the top beam is provided with a falling prevention device for the support, and bottom lifting, skid prevention and support regulation devices are arranged on the base; and a levelling device is arranged on a cross binding head on the front end of the push rod; the support adopts 2-meter width between centers, the maximum height ranges from 6.3 meters to 7.5 meters, and the front end of the telescopic beam is provided with a third-stage edge protection device which is not lower than half of the mining height. The support has obvious effects of controlling the wall caving of the coal wall of a super thick coalseam, the roof fall of the ceiling, and the stability of the hydraulic support.

The invention discloses a low voltage ride-through control method of a doubly fed induction aero-generator, which is used when a power network has short circuit faults. The control method is characterized in that a rotor exciting voltage positive-sequence control current and a rotor exciting voltage negative-sequence control signal are respectively formed through limiting a rotor slip frequency current and a rotor (2-s) rated frequency current when the power network has faults, and a generator is utilized for realizing the attenuation of stator flux transient DC components and reducing the rotor side influences of the stator flux transient components, positive-sequence components and negative-sequence components. The control method has the advantages that no hardware protecting device is required to be added; under the condition that the power network has symmetrical and asymmetrical faults, the overcurrent occurrence of the rotor can be effectively restrained, and the safe operations of the generator and a rotor exciting converter are protected; in the process that the power network has the faults, the transient generator impact to the power network and a mechanical system can be effectively reduced; the normal operation of the generator can be fast recovered after the faults are removed, and the timely support to the power network can be realized.

The invention belongs to the technical field of equipment for advancement production of coal mines, and particularly relates to hydraulic walking multi-level temporary supporting equipment for advancement of a tunnel, which aims to realize safe and fast advancement of coal mine advancing tunnels. Single supports, which are located on the same side, of a walking support group and a temporary support group are serially connected onto a guide track and can slide relative to the guide track, and single supports located on the left side and the right side of the walking support group and single supports located on the left side and the right side of the temporary support group are connected with a pushing mechanism capable of pushing the single supports to move longitudinally. The hydraulic walking multi-level temporary supporting equipment has the advantages that safety of supporting operation is greatly improved; timely supporting of the supporting equipment can be guaranteed when the grade of the tunnel is changed; and the supporting equipment is an integral structure, runs independently and saves time, labor and space.

The invention discloses an excavation method for a tunnel passing through a high-angle thrust water-rich and sand-rich fault. A construction tunnel hole is divided from the top to the bottom into an upper hole body, a central hole body, and a lower hole body, wherein the upper hole body is divided into a left guide hole and a right guide hole. A primary support structure of the tunnel hole is a double-layer primary support structure. During the excavation of the construction tunnel, the construction tunnel is divided into a plurality of tunnel segments from the back to the front for excavation. During the excavation of any one tunnel segment, the method comprises the steps: 1, performing the excavation of the upper hole body and the primary supporting; 2, performing the excavation of the central hole body and the primary supporting of an outer layer; 3, performing the excavation of the lower hole body and the primary supporting of the outer layer; 4, performing the primary supporting of an inner layer; 5, repeatedly performing the steps 1-4 for many times, and completing the excavation of the tunnel. The method is simple in step, is reasonable in design, is convenient for construction, is good in use effect, employs a three-step method for the excavation of the tunnel hole, employs double primary support structure for the full-section support of the tunnel hole after excavation, and can guarantee the safety of the tunnel structure later.

The invention discloses a mobile support bracket of a tunneling machine, which comprises two bracket units that are arranged side by side front and back; each bracket unit comprises two bases respectively arranged at the two sides of the tunneling machine, and a top beam arranged above the tunneling machine, wherein a lifting mechanism used for supporting the top beam is connected between the bases and the top beam; the front end of the top beam is provided with a telescopic beam driven by a telescopic beam straight line driving mechanism; the front end of the telescopic beam is provided with shovel teeth; two side protecting plates driven by a side protecting plate straight line driving mechanism are respectively arranged at the two sides of the top beam in a sliding way; and a pushing device used for driving the bracket units to move is connected between the two bracket units. After the structure is adopted, the tunneling machine can be supported by the mobile support bracket, and the mobile support bracket can move along with the tunneling machine, so that the newly tunneled space is supported in time.

The invention discloses a tank truck side turn supporting device and a control method thereof. The device is provided with a control system, a horizontal supporting rod and a vertical supporting rod,wherein the horizontal supporting rod is driven by a horizontal driving device; the vertical supporting rod is driven by a vertical driving device. The side-tipping angle of the tank truck is monitored by the control system, and when the tank truck has side turn, the horizontal supporting rod and the vertical supporting rod are controlled to rapidly extend out, so that the vehicle is supported, and the problem that the conventional device cannot be supported when the side-tipping angle of the truck is too small or too large is effectively solved; and due to the synergistic action of the two supporting rods, the supporting rods can contact with the ground without extremely long extension, and the influence to adjacent lanes can be avoided. According to the control method, by comparing the side-tipping angle of the tank truck and a threshold value K, when the side-tipping angle is more than or equal to the threshold value K, the supporting device is controlled to extend out and support;and when the side-tipping angle is less than the threshold value K, the supporting rods are actively retracted when the vehicle is straightened, the tank truck can conveniently run normally after danger treatment, the influence to trafficability is avoided, and support can be provided in time during subsequent side turn of the tank truck.

The invention discloses a tunnel excavation support structure for a stratum with a soft upper part and a hard lower part and a tunnel excavation construction method, and belongs to the technical fieldof tunnel construction. The tunnel excavation support structure for the stratum with the soft upper part and the hard lower part is characterized by comprising an arch cover and hard rock at the lower layer of a tunnel, the arch cover is composed of a plurality of arched steel frames, a plurality of small guide pipes and a sprayed concrete layer, the arched steel frames are sequentially arrangedand connected together in the direction of the tunnel and fixed to the hard rock at the lower layer of the tunnel after the arch angle is increased, the small guide pipes are arranged at the arch toppart and driven into the soft stratum of the upper portion of the tunnel, the tails of the small guide pipes are welded to the arched steel frames, the sprayed concrete layer wraps the arched steel frames, and large arch feet are formed at arch foot parts. According to the tunnel excavation support structure, the strength of the arch cover is high, the arch feet of the arch cover are supported onthe stable bed rock on both sides, the load of the arch cover can be transmitted to the hard bed rock at the lower layer, the structure and a mountain can jointly resist the load, the construction safety can be ensured, and the construction efficiency can be improved.

The invention discloses a construction method for a tunnel passing through a high-angle thrust water-rich and sand-rich fault. The method comprises the steps: 1, performing the preliminary excavationand the supporting construction of a rear tunnel segment; 2, performing the synchronous excavation and the supporting construction of the rear tunnel segment and a water drainage hole body of a waterdrainage hole; 3, performing the synchronous excavation and the supporting construction of the rear tunnel segment, the water drainage hole body of the water drainage hole and a rear detouring headingsegment; 4, performing the excavation and the supporting construction of a front water drainage hole body, a front heating segment and a central tunnel segment; 5, performing the excavation and the supporting construction of a front tunnel segment. According to the invention, the water on the upper wall of the fault is drained through a high-level water drainage hole between a tunnel front hole and a detouring heading pit, and the auxiliary water drainage is performed through the detouring heading pit, and the fault condition in front of the tunnel face of the front hole can be explored in advance, thereby guaranteeing the construction safety of each tunnel face. The method employs the three-step method for the excavation of the tunnel front hole, employs double preliminary supporting structures for the full-section supporting after excavation, can guarantee the safety of the tunnel structure later, and shortens the construction cycle.

The invention discloses a four-leg shield-type sublevel caving hydraulic support, which comprises four supporting hydraulic extension legs equipped on a pedestal. The top ends of the four supporting hydraulic extension legs are respectively hinged with a top beam; a forward extension beam is hinged at the front end of the top beam; a sprag is hinged at the front end of the forward extension beam, a sprag lifting jack is equipped on the forward extension beam, an ejector rod of the sprag lifting jack is hinged with the back part of the sprag; the back part of the top beam is hinged with the upper part of a shield beam; the lower part of the shield beam is hinged with the pedestal via the a four-bar linkage mechanism; a tail beam with box-shaped construction is hinged with the lower end of the shield beam, a tail beam lifting jack is equipped between the lower part of the tail beam and the lower part of the shied beam; and a slide track, an inserting plate equipped in the slide track and a inserting plate lifting jack for driving the inserting plate to carry out reciprocating movement along the slide track are equipped in the box of the tail beam. The invention is especially suitable for caving integrated mining working face under pitching coal bed, flat-pitching half hard coal bed and 'three-soft' coal bed conditions.

The invention provides an after-sales equipment predictive maintenance cooperation system based on digital twinning, and the system comprises: a construction module which is used for constructing a cooperative maintenance seven-dimensional model based on digital twinning of an equipment manufacturer; an acquisition module which is used for acquiring and transmitting operation state parameters of the equipment based on a digital twinning collaborative maintenance seven-dimensional model; an analysis module which is used for carrying out prediction analysis on the collected equipment operation parameters based on the cooperative maintenance seven-dimensional model based on digital twinning to obtain a prediction result of the equipment; a judgment module which is used for judging whether thestate of the current equipment is normal or not according to the obtained equipment prediction result; a processing module which is used for carrying out preliminary diagnosis on an abnormal problemof the current equipment when the current equipment is judged to be in an abnormal state, so as to obtain a preliminary diagnosis result; and a display module which is used for visually displaying theoperation state, the prediction trend and the preliminary diagnosis result of the equipment to production operators and equipment maintenance participants in real time based on the cooperative maintenance seven-dimensional model based on digital twinning.

The invention relates to the field of seat design and manufacturing, in particular to design of a cushion, a backrest and a waist support of a seat. The invention is realized through the following technical scheme: the waist support seat capable of improving comfort comprises a foot support, a sitting stool, a backrest, a fixing frame connected with the foot support and a rotating frame rotationally connected with the fixing frame, the backrest is installed on the rotating frame, and a waist support used for supporting the waist of a human body is further installed on the rotating frame. The invention aims to overcome the defects in the prior art, and provides the waist support seat capable of improving the comfort. When a user moves back and forth on the seat, the waist support can clingto the waist and back of the human body to move synchronously and cling to the waist in real time, so that supporting force to the waist of the human body is increased.

The invention discloses a method and system of closed loop assessment for pipe body defects of a long-distance oil and gas pipeline, and relates to the technical field of pipeline systems. The assessment method comprises the following steps: 1) beginning; 2) recognizing and assessing the pipe body defects; 3) examining and verifying; 4) if the examination and verification are not pass, returning to recognize and assess the pipe body defects, and if the examination and verification pass, moving to a database firstly and then conducting defect repairing; 5) examining and verifying; 6) if the examination and verification are not pass, returning to defect repairing, and if the examination and verification pass, moving to the database firstly and conducting item-removing assessment; 7) finishing. According to the invention, a closed loop monitoring of defect recognizing and assessing, defect repairing and defect item-removing assessment for a pipe body can be achieved, the operation process of the defect closed loop assessment is simplified, related service information is integrated, accurate and reliable data support is provided for service management and decision, and defect item removing effect is effectively assessed.

The invention discloses a large-section loess tunnel supporting system and a supporting construction method. The large-section loess tunnel supporting system comprises a tunnel forepoling structure, atunnel initial supporting structure and a tunnel secondary lining. The upper surface of an inverted arch secondary lining in the tunnel secondary lining is a horizontal plane, and an inverted arch backfill layer is arranged on the horizontal plane. The supporting construction method comprises the following steps of firstly digging a tunnel and conducting initial supporting; and secondly constructing the secondary lining and backfilling the inverted arch. The large-section loess tunnel supporting system is reasonable in design, easy and convenient to construct, high in construction efficiencyand good in use effect, the tunnel forepoling structure, the tunnel initial supporting structure and the tunnel secondary lining constitute a combined supporting system to stably and reliably supportthe large-section loess tunnel, the upper surface of the inverted arch of the secondary lining is adjusted to be a horizontal plane, the construction process of the inverted arch of the tunnel can beeffectively simplified, and the rigidity of the inverted arch of the tunnel is greatly improved; in this way, the construction efficiency of the tunnel secondary lining is improved, the ring sealingtime of the tunnel secondary lining is shortened, the integrity of the tunnel secondary lining is higher, and the overall force bearing effect is better.

The invention discloses a combination type tunnel lining, a culvert or an underground comprehensive pipe gallery. The combination type tunnel lining, the culvert or the underground comprehensive pipe gallery comprises a pipeline formed by axially assembling unit plate pieces with radians in the circumferential direction. Each unit plate piece is provided with a pair of arc-shaped sides and a pair of straight sides. The arc-shaped sides are outwards folded to form cavity structures of which the periphery of each cross section is closed. The combination type tunnel lining, the culvert or the underground comprehensive pipe gallery has the advantages that the cavity structures of the comprehensive pipe gallery are formed by bending the cavity structures to form cavity pipe columns with the closed cross sections, auxiliary steel plates or blocking steel plates do not need to be additionally arranged, welding seams are reduced, and the strength of the cavity structures for forming arched beams is high; connecting pieces among the adjacent unit plate pieces of the comprehensive pipe gallery are all hidden inside structural pieces and do not need to be exposed inside a tunnel or the culvert, and the utilization rate of the internal space of the tunnel or the culvert is increased; in addition, operation holes are formed in the inner side of the pipe gallery, and splicing work can be easily competed by construction personnel only on the inner side of the pipe gallery.

The invention discloses a construction method of a loess tunnel entrance section through a landslide mass. The method comprises the following steps that 1, an entrance soil layer is pre-reinforced; 2,a tunnel entrance is constructed; 3, excavation and initial support construction is conducted on the reinforced tunnel section; 4, a reinforced tunnel section base is reinforced; 5, the reinforced tunnel section is subjected to secondary lining construction; 6, excavation and initial support construction is conducted on a rear side tunnel section; and 7, the rear side tunnel section is subjectedto secondary lining construction. The method is reasonable in design, simple and convenient to construct and good in use effect, cement-soil mixed piles are adopted for pre-reinforcement before excavation, a construction process of the tunnel entrance section through the landslide mass is guaranteed to be safe and reliable, meanwhile, the tunnel entrance section is excavated by adopting a three-step excavation method, the reinforced tunnel section base is reinforced, an excavation process of the tunnel entrance section through the landslide mass can be guaranteed to be safe and reliable, in addition, the influence on the stability of a soil layer on the circumferential side of the tunnel entrance is small, and the stability of the excavated and formed tunnel entrance can be effectively improved.

The invention discloses a tunnel portal section pre-reinforcement and excavation construction method based on partition blasting. The construction method comprises the following steps of 1, precipitation pre-reinforcement; 2, earth surface pre-reinforcement, and specifically, reinforcing the surface of a backfill section in a construction tunnel portal section through adopting a cement soil stirring pile; and 3, tunnel excavation construction, and specifically, carrying out excavation construction from rear to front in a plurality of excavation sections, wherein the process comprises the following steps of surveying and setting out, performing drilling and blasting construction, excavating an upper portal body, excavating a middle portal body and excavating a lower portal body. The construction method is reasonable in design, simple and convenient in construction and good in use effect; the underground water level is reduced through precipitation pre-reinforcement, and then surroundingrock is effectively reinforced; after the backfill section is subjected to surface pre-reinforcement through using the cement soil stirring pile, a three-step synchronous excavation mode is used forcarrying out partition blasting excavation, so that it is ensured that the tunnel excavation process is safe and reliable and a tunnel structure is stable.

The invention relates to the technical field of electronic commerce and further discloses an express cabinet emergency auxiliary device based on the balance principle. The auxiliary device comprises acabinet body, wherein an alarm is fixedly connected to the exterior of the cabinet body, a glass tube is fixedly connected to the interior of the cabinet body, a steel ball is movably connected to the interior of the glass tube, a power connection sheet is fixedly connected to an inner surface of the glass tube, a long rod is movably connected to the interior of the cabinet body, a connecting rodis fixedly connected to the exterior of the long rod, and a copper rod is fixedly connected to the exterior of the connecting rod. The auxiliary device is advantaged in that through interaction of the glass tube, the steel ball, a power connection sheet, a support plate, a rotating rod, a support rod, a spring I, a protection assembly, a limiting assembly and an inclined block, when an express cabinet accidentally topples over, emergency auxiliary supporting can be carried out on the express cabinet, the situation that the express cabinet directly topples over, and consequently the express cabinet is directly broken or express in the express cabinet is damaged is prevented, and then unnecessary economic losses are greatly reduced.

The invention discloses a tunnel construction method for passing through the boundary stratum of earth and stone. The tunnel construction method comprises the following steps: I, excavation of a reartunnel segment and initial supporting construction; II, excavation of a middle tunnel segment and initial supporting construction; III, excavation of a front tunnel segment and initial supporting construction, wherein the rear tunnel segment, the middle tunnel segment and the front tunnel segment are all three-step synchronous excavated tunnel segments; and in the process of excavation from rear to front, constructing the secondary lining of the tunnel on the inner side of the initial supporting structure of the constructed tunnel from rear to front. The tunnel construction method has the advantages of reasonable design, simple construction and good use effect. The tunnel construction method selects an appropriate drilling and blasting method according to the position relationship betweenthe earth and stone interface and a tunnel hole, adopts a three-step synchronous excavation way to carry out blasting excavation, can ensure the safe and reliable excavation process of the tunnel passing through the boundary stratum of earth and stone, and can ensure the stable structure of the tunnel. Moreover, in the excavation process, the initial supporting structure and the secondary lining of the tunnel are adopted to provide stable and reliable supporting for the large-section tunnel.

The invention discloses a through landslide body loess tunnel construction method. The through landslide body loess tunnel construction method comprises the following steps of constructing a tunnel entrance section and a tunnel exit section simultaneously; and respectively constructing an inclined shaft auxiliary construction inlet section and an inclined shaft auxiliary construction outlet section through a tunnel inclined shaft when the tunnel entrance section and the tunnel exit section are constructed. The through landslide body loess tunnel construction method is reasonable in design, convenient to construct and good in using effect; the loess strata in the construction area where the tunnel entrance section is positioned is subjected to reinforcement treatment by using a cement soilmixing pile in advance before excavation, and the reinforcement length and the reinforcement depth are effectively limited; a loose soil body on a hole body of a tunnel hole is solidified in advance so as to ensure the safety and reliability of the construction process of a hole inlet section of the through landslide body loess tunnel; meanwhile, in the construction process of the tunnel by adopting a three-step excavation method, the construction process of track plates is completed synchronously, so that the construction process of the loess tunnel can be completed easily, conveniently and quickly; and the stability of an excavated and formed tunnel hole can be effectively improved.

The invention discloses a pair of shoes and a cushioning supporting system thereof. The cushioning supporting system comprises a shoe sole body, a supporting piece and a cushioning part. The shoe sole body comprises a front foot sole part corresponding to the position of the front foot sole of the human body and a heel part corresponding to the heel position of the human body. The bottom of the heel part is provided with an installing notch. The supporting piece is located in the installing notch, is adaptive with the installing notch in size, and is fixedly connected with the shoe sole body, the hardness of the supporting piece is larger than that of the shoe sole body, the cushioning part is located in the installing notch, is adaptive with the installing notch in size and is overlaid on the lower side of the supporting piece and fixedly connected with the supporting piece, and the elasticity of the cushioning part is larger than that of the shoe sole body. The objectives of improving stability of the flexible shoe sole and providing higher cushioning and higher and more timely supporting force for the human body can be achieved, and thus the objectives of providing a better reinforcement effect and guaranteeing wearing comfort are achieved.