30results about How to "Prevent roof fall accidents" patented technology

The invention discloses an exploiting method for a working face to pass through cross and complex small coalpit tunnels. An arrangement direction of the working face is adjusted manually according to the following steps: the arrangement direction is adjusted 30 meters away from the small coalpit, a tail propels in advance, the tail supports scraper conveyers, and a head does not support scraper conveyers; the head and the tail propel simultaneously, but the head propels in advance, so that the arrangement direction of the working face is changed again; when the small coalpit is nearly exposed during propelling, the working face is leveled, an expansion anchor pole is anchored to a coal wall. The method can effectively prevent generation of roof fall accidents near the small coalpit, so that production inconvenience due to working face coal wall caving is eliminated. Safety and high efficiency of production environment on the working face which passes through the small coalpit is guaranteed.

The invention provides a tunnel anti-roof-caving supporting method under influences of repeated mining. The method includes the steps of primarily supporting a tunnel, establishing a tunnel model, determining the tunnel anti-roof-caving theoretical key stage under the influences of repeated mining, collecting top plate displacement and surface displacement deformation of the tunnel in real time, determining the tunnel anti-roof-caving actual key stag range under the influences of repeated mining according to the top plate displacement and surface displacement deformation, collecting the breakage depth of the actual key stage range in real time, and conducting reinforced supporting on the tunnel according to the breakage depth. By means of the tunnel model, the tunnel anti-roof-caving theoretical key stage under the influences of repeated mining is obtained; in combination with the top plate displacement and surface displacement deformation, the actual key stage range is obtained; the reinforced supporting is conducted on the tunnel in the actual key stage range, roof caving accidents of the tunnel under the influences of repeated mining can be effectively avoided, and the tunnel maintains safe and stable.

An apparatus for monitoring a mining fiber grating roof separation layer comprises a perpendicular measurement barrel (1) disposed in roof drill hole and a packaging housing (19) connected under the perpendicular measurement barrel (1). Fixed-pulley fixed-frames (6) and steel tape pulley fixed-frames (7) are symmetrically disposed on the upper portion of the packaging housing (19), and constant-strength cantilever beams (15) are symmetrically disposed on the lower portion. Tension springs (16) are disposed on opposite ends of the constant-strength cantilever beams (15). The other ends of the two tension springs (16) are connected to a steel wire rope (3). The steel wire rope (3) passes through steel tape pulleys (17) and fixed pulleys (18), and penetrates out from a steel wire rope led-out hole (2) on the top of the perpendicular measurement barrel (1). The end head of the steel wire rope (3) is connected to an anchorage head (5). Fiber gratings A (8) and fiber grating B (9) are symmetrically disposed at left sides and right sides of the constant-strength cantilever beams (15). The fiber gratings A (8) and the fiber gratings B (9) penetrate out from a fiber led-out hole (10) through a same fiber (12) and are connected to a fiber connector (14). Also disclosed is a method for monitoring a mining fiber grating roof separation layer by using the apparatus for monitoring a mining fiber grating roof separation layer.

The invention discloses a novel anchor rod pulling resistance alarm. The novel anchor rod pulling resistance alarm comprises a pressure sensor box, a sensor rod, a light-emitting diode and a sounder, wherein the pressure sensor box sends out a signal, the signal is transmitted to the light-emitting diode and the sounder through the sensor rod, the pressure sensor box is annular and is provided with a central hole whose size is 18-22 mm, the sounder and the light-emitting diode are provided with a sealing waterproof device, and a button cell is arranged inside the pressure sensor box and is used for supplying power to the sounder and the light-emitting diode. The novel anchor rod pulling resistance alarm monitors the pulling resistance of an anchor rod in real time and gives an alarm before danger, thereby guiding people to take related maintenance measures in advance, preventing the anchor rod from being pulled broken and avoiding roof collapse accidents.

The invention discloses a method for detecting while drilling the Platts coefficient of roadway roof rock based on a sound level meter, aiming at the problem of detecting while drilling the Platts coefficient, which is an important rock mechanics index affecting the roof anchoring support scheme of coal mines, in the roadway. Drill holes of Φ32~42mm on the top plate. A bearing-type drilling-while-drilling device with a sound level meter probe is installed behind the drill bit. The method combined with the reading of the scale drill pipe is used to test the drilling volume of different depths during the drilling process. The decibel value, combined with the standard library of rock Platts coefficient of 0.3 to 20 established in the laboratory, by comparing the decibel value of the in-situ rock drilling volume in the roadway, the Platts coefficient of the rock within the drilling range of the roadway roof can be quickly obtained, and the drilling process can be calculated. Harmful noises are transformed into beneficial sound sources, enabling detection while drilling technology. It is suitable for the detection of Platts coefficient of typical sedimentary rocks such as sandstone, shale and mudstone in coal measure strata while drilling. It has the advantages of convenient on-site use, simple operation, low labor intensity and no influence on normal production.

The invention discloses a roadway support quantitative design method based on the size of the plastic zone of the surrounding rock, comprising the following steps: step 1, calculating and determining the radius R of the plastic zone of the surrounding rock of the roadway; step 2, classifying the surrounding rock of the roadway according to the calculation result; Step 3, according to the roadway surrounding rock classification results, carry out targeted support parameter design for different types of surrounding rock; Step 4, modify and adjust the support parameters according to the site monitoring feedback information. The support parameters designed in the present invention based on the size of the plastic zone are scientific and reasonable. On the basis of obtaining the radius of the plastic zone of the roadway and the geometric characteristic index of the boundary, the surrounding rock of the roadway is classified with the radius of the plastic zone as the main index, so as to classify different types of rocks. Surrounding rock is designed with pertinent support parameters to ensure the scientificity and economy of roadway support design; the invention can prevent roadway roof fall accidents for roadway support.

The invention relates to a temporary supporting forepoling bar suspension device of a full anchor-cable supporting roadway and application. The device is characterized in that the suspension device isin an inverted L shape and comprises a longitudinal plate and a transverse plate, an anchor device penetrating hole is formed in the transverse plate, a threaded hole is formed in the top of the longitudinal plate, and a safe baffle plate is arranged on the inner side of the transverse plate, and the length and width of the safe baffle plate are same as those of the transverse plate; according tothe device, each forepoling bar utilizes two temporary supporting forepoling bar suspension devices of the full anchor-cable supporting roadway. The device is simple in manufacturing technology, flexible in operation and high in adaptability, it can be ensured that after coal cutting (blasting), the full anchor-cable supporting roadway can be effectively supported temporarily, by adopting the suspension device, an original anchor cable which has reached the pre-tightening state does not need to be dismantled, and it is avoided that due to dismantling of the anchor cable, anchoring fails, theempty roof phenomenon occurs again, and the roof falling accident is caused.

The invention relates to a device for an anchor rod anchoring force testing simulating comprehensive experiment. The device can effectively solve the problem that time and labor are wasted and the accuracy rate is low simultaneously in the prior art. The technical scheme is that the device comprises a machine frame, a steel pipe, an anchor rod and an annular oil cylinder. The machine frame is formed by supporting legs, an upper frame and a lower frame. The four supporting legs are respectively welded to four corners of both a horizontal upper frame and a horizontal lower frame, an oil cylinder mounting plate is installed in the front of the machine frame, the annular oil cylinder is installed on the oil cylinder mounting plate, a support is installed on the upper frame, a hand pump and a digital display meter are installed on the support, the steel pipe is fixed on the lower frame through a clamping plate, one end of the anchor rod is anchored in the steel pipe, the other end of the anchor rod penetrates through the center of the annular oil cylinder, and the anchor rod extends out of one end of the annular oil cylinder and is fixed through a baffle at the end of the annular oil cylinder. The device is low in cost and high in accuracy rate and greatly improves working efficiency, top plate roof collapse accidents on the working site are effectively avoided, and the device is innovation for anchor rod anchoring force testing devices.