34results about How to "Prevent roof fall" patented technology

The invention discloses a construction method of a reverse slope tunnel, which comprises the following steps: an arc-shaped heading is excavated in a circular shape, a core soil is reserved, and a first step is excavated; two second steps and two third steps reserved on the left and right sides of the core soil are respectively excavated, and the shotcrete and anchor support is carried out; the reserved core soil is excavated; an inverted arch is excavated and the initial support of the inverted arch is made; a waterproofing plate of the inverted arch is laid, and the side wall concrete is poured; after the pouring of the inverted arch concrete is completed, the inverted arch shall be backfilled in time, and the construction of secondary lining of the concrete shall be carried out. According to the invention, the construction of the reverse slope tunnel under the water level line of the adjacent reservoir is carried out, and the reverse slope is being made positive, so that the water seepage and the water inflow of the first step and the second step tunnel face can be timely discharged to the temporary water collecting pit of a third step to prevent the tunnel surrounding rock fromfalling out of the block, roof falling, landsliding or water inflowing. The integrity of the tunnel surrounding rock can be ensured, and the adverse effect on the reservoir and the surrounding environment can be reduced.

The invention discloses a liquid pressure monitoring device and a monitoring method. The whole device is in a cylindrical structure. Upper and lower end covers are arranged at upper and lower parts of the cylinder. Upper and lower end covers contact a middle bearing tube. An inner space formed by the upper and lower end covers and the bearing tube is a bearing cavity. The upper and lower end covers and the bearing tube are in threaded connection. A male straight joint is arranged at the center of the top of the upper end cover, and is connected with a hydraulic support. A circular color-developing material is arranged on the outer side of the bearing tube. A circular reflective material is arranged between the color-developing material and the bearing tube. A circular polarizing plate is arranged on the outer side of the color-developing material. When the device is used for monitoring, the bearing tube is pressed, and the color-developing material produces circumferential tensile stress. Under the irradiation of a headlight, different colors can be clearly distinguished. Through the corresponding relationship between a color-pressure table, the pressure of the hydraulic support can be monitored. According to the invention, the slump of a roof can be effectively predicted to ensure the safe production of a coal mine.

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 isprovided 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 temporary support hydraulic support for a tunneling working face. The temporary support hydraulic support for the tunneling working face comprises a protective ejection beam, two longitudinal bearing structural bodies arranged on the left side and the right side of the protective ejection beam, a front protective device and a side protective device. Each longitudinal bearing structure body comprises a longitudinal bearing top beam, a base and supporting stand columns. The cross section of each base is in the shape of a groove with a downward opening. Each base is provided with a base lifting device. Each base lifting device comprises a base lifting oil cylinder and a base lifting supporting plate. Each base lifting oil cylinder is vertically installed on the front portion of the corresponding base. Each base lifting supporting plate is arranged in the groove of the corresponding base. A pushing oil cylinder is arranged between each base lifting supporting plate and the base. The protective top beam is provided with a supporting and loading oil cylinder pointing to a tunnel roof. By the adoption of the temporary support hydraulic support for the tunneling working face, base lifting and self movement of the hydraulic support are achieved, the roof supporting capacity is high, all-directional safety protection is achieved, a safe working environment is created for mine coal roadway fully-mechanized tunneling construction personnel, and the tunneling efficiency and the footage level are improved.

The invention provides a construction method for preventing roof caving of a shield in construction. The construction method comprises the steps that 1, stratum investigation is performed along a shield path; 2, a cap peak device is installed on a shield tunneling machine; 4, the cap peak device is applied to shield construction. When the cap peak device is not adopted, the cap peak device is retracted into a cutterhead face through a hydraulic oil cylinder; when the shield enters the roof caving stratum, the cap peak device can stretch out by means of the hydraulic oil cylinder, the stretching-out length can be determined according to the condition of the stratum, and roof caving is prevented according to the stretching-out length of the cap peak. By adopting the construction method, roof caving of the shield on various geological conditions is prevented more easily and conveniently, the axis control quality is improved, and soil body disturbance and ground deformation are reduced.

A large-mining-height fully-mechanized-face fast coal mining technology is suitable for large-mining-height fully-mechanized-face fast coal mining with a roof of a coal seam higher than medium hard level and firmness coefficient of the coal seam more than 1.0. Coal is first cut in the middle part of the coal seam, a front roller of a coal mining machine is then used for cutting top coal, a rear roller of the coal mining machine is used for cutting bottom coal, and simultaneously a hydraulic support of a coal cutting achieving part is moved, after the hydraulic support is moved, a face guard of the hydraulic support is opened to enable the face guard to be tightly attached to a coal wall. Every cycle operation goes on sequentially in a cycling mode according to the working procedures, the middle part of the coal seam is cut first, and the top coal at the upper part depends on the face guard to support so that wall caving of the coal wall and roof fall of the end face can be effectively prevented. Due to the fact that a coal cutting height is reduced, coal cutting speed is remarkably improved, and simultaneously coal of large sizes cannot be produced. Therefore, the large-mining-height fully-mechanized-face fast coal mining technology fundamentally resolves the problem that large-mining-height fully-mechanized-face large-sized coal hinders working-face coal cutting, coal charging and coal carrying, removes potential dangers of manually breaking large-sized coal, and is simple in technological operation, safe, reliable and high in efficiency.

Provided is a supporting method capable of preventing roof and wall falling accidents. By means of the supporting method, joist steel, metal nets and a hydraulic support are adopted for supporting a broken roof plate of a working surface in an auxiliary mode. When an opening is cut in the working surface, metal nets with certain specifications are overlaid on a section of a cut opening on the whole working surface are fixedly connected onto the section of the cut opening, and certain pitches among the metal nets are connected through iron wires. Afterwards, the hydraulic support is installed in the cut opening, a top beam of the hydraulic support butts against a direct top, so that the connected metal nets can droop in front of the hydraulic support and butts against a coal mine wall through a face guard plate. The joist steel is horizontally bundled on the metal nets before the hydraulic support through iron wires. In coal mining, the face guard plate is drawn back, and the metal nets in front of the hydraulic support are bundled on a column through iron wires. When coal mining is not performed, the metal nets are put down, the face guard plate butts against the coal mine wall, the support moves frontward, the metal nets are connected with the joist steel and moves to cover on the roof plate relative to the support, then work for connecting the metal wires and bundling the joist steel can be performed uninterruptedly and repeatedly until actual mining on the working surface is finished.

The invention discloses a hydraulic support for super-large mining height, which includes a top beam and a double-layer roof protection and side protection mechanism installed on the top beam. The top beam includes an upper slideway cavity and a lower slideway cavity. The roof protection mechanism includes an upper telescopic beam roof protection mechanism and a three-stage side protection mechanism. The upper telescopic beam roof protection mechanism includes an upper telescopic beam slidably installed in the upper slideway cavity and an upper telescopic beam matched with the upper telescopic beam. Beam jack, the three-stage protection mechanism includes a lower telescopic beam slidably installed in the lower slideway cavity, a lower telescopic beam jack matched with the lower telescopic beam, and a three-stage apron installed at the front end of the lower telescopic beam ontology. The ultra-large mining height hydraulic support obtained by the present invention can cope with the side protection problem caused by the increasing mining height of the working face, and is suitable for full-height mining in one-time mining of extra-thick coal seams.

The invention provides a stope coal wall caving control device. The stope coal wall caving control device is characterized in that a hydraulic support device and a caving protection device are integrally arranged on the same support base, a hydraulic support top plate and a hydraulic support auxiliary plate of the hydraulic support device are arranged on the top of a coal seam, the caving protection device is arranged on a stope coal wall, and support protection angles of a caving protection plate of the caving protection device can be adjusted. The stope coal wall caving control device has the advantages that the hydraulic support device and the caving protection device are integrally arranged, the support protection angles of the caving protection plate can be adjusted, and accordingly the caving protection fastening property and safety can be greatly improved; the stope coal wall caving control device is provided with angle adjusting teeth, accordingly, angles of the caving protection plate can be conveniently adjusted, and the caving protection plate can be conveniently mounted; anchor rods are arranged on the protection plate, accordingly, the coal wall caving fastening property can be effectively improved under joint effects of the protection plate and the anchor rods, and roof collapse can be prevented; positioning protrusions are arranged on anchor rod holes, and accordingly the supporting convenience and accuracy of the anchor rods can be improved.

The invention discloses a detection device and a detection method for the axial force of an anchor rod. An integrated structure of the device is a regular hexagonal prism; an upper end cover and a lower end cover are respectively connected with a protective shell through fastening screws; a plurality of two-pole U-shaped magnetic cores are uniformly disposed at an outer side of an anchor rod fastening nut; the two-pole U-shaped magnetic cores are located in a space encircled by the upper end cover, the lower end cover and the protective shell; silicon rubber sleeves are sleeved on two magneticpoles of the two-pole U-shaped magnetic cores; a magnetic fluid is filled in each of the silicon rubber sleeves; a circuit slot is disposed in the space encircled by the upper end cover, the lower end cover and the protective shell; a control circuit is disposed in the circuit slot; a wire led from the control circuit passes through the circuit slot to wind an excitation coil and a detection coilto upper and lower ends of the two-pole U-shaped magnetic cores; elastic sheets are disposed at outer sides of the two-pole U-shaped magnetic cores; and the elastic sheets are fixed on an inner wallof the protective shell. The detection device and the detection method for the axial force of the anchor rod are used for detecting the axial force of the anchor rod, the collapse and cave-in of a topplate are avoided, a top plate support parameter is provided, and a reliable technical parameter is provided for support design of a laneway layout and safety monitoring of the top plate.