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

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 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.