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Hydraulic Rock Splitter Used in Leading Tunnel
Sep 21, 2018

Non-explosive construction method of splitting machine in tunnel leading tunnel

Hydraulic Rock Splitter Used in Leading Tunnel


Determine the non-explosive excavation section, the non-explosive excavation of the super-guide hole, the section size is determined according to the overall excavation section of the tunnel and the size of the gutter area, and must meet the operation requirements of the operators, and also facilitate the on-site operation, non-explosive excavation part It should be located at the lower centerline of the tunnel. Considering the cycle time of non-blasting excavation of tunnel and tunnel excavation layer and support, it is organized according to the cycle of one day, and the non-explosive excavation section is also adopted considering the characteristics of the largest circular area under the same perimeter conditions. The circular section has a radius of about 1.5m. It is possible to set up a simple working bracket at one time and complete all drilling in one operation cycle.

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      The measuring line and the cloth hole are measured by the measuring personnel according to the control wire in the tunnel hole, and the center of the non-explosive excavation section is accurately measured, and then a circle with a radius of 1.5 m is drawn on the face of the hand. The water drilling hole can be continuously laid along the contour line. Since the water-milling stroke is only 60cm, the effective hole-forming depth is about 50cm. It is necessary to drill multiple times to reach the design cycle of the non-explosion zone. The water-milling drill hole needs to have a certain extrapolation angle. If the hole is cut, the tangential circle is used. There is a wedge-shaped rock mass at the end of the hole, and the section is not continuous. Therefore, the shape of the occlusal circle is adopted when the hole is opened, and the wedge-shaped rock at the end of the hole is eliminated to form a continuous empty surface. The hole spacing for the splitting in the middle is 40cm and the row spacing is 40cm. The center line of the tunnel is arranged in a plum-shaped shape. Drilling and core drilling with water grinding along the edge of the excavation line, the hole depth is about 50cm; the middle is hydraulically splitter, and the layer is split by layer by section. The water mill drill bit is located at the piercing hole and the simple gantry is set up. The gantry for drilling and splitting is erected by scaffolding. The non-explosive excavation area at the top of the gantry is 80cm high and 2m wide (1m each on the left and right sides) to facilitate personnel operation and water mill drilling. The erection of the gantry should be firm, the strength and stability meet the requirements, minimize the sloshing of the operation, and ensure the construction safety and the accuracy of the trial drilling.


     The water mill drills the hole and takes the surrounding core to suspend the water mill drill on the work platform with the inverted chain, and installs the support frame that can adjust the horizontal position of the water mill drill, then adjust the water mill drill position up and down, and check whether the water mill drill can Smooth in place. Check whether the water grinding drill is running normally, and then manually pull the core drill to drill the core in the tunnel contour line. The core is drilled in the horizontal direction by the phase cutting circle, and the continuous channel air surface is formed in the periphery. In order to ensure the core-removing efficiency and the small over-excavation amount at the same time, the distance between the adjacent drill centers is 13cm, the two holes are overlapped by 2cm, and the number of core holes per cycle is 65-70. According to the length of the core drill, the drilling depth is about 50cm. 2 to 3 rigs, each rig requires 3 to 4 people to operate. One hole drilling time is about 5 to 10 minutes when taking the core. When the water-crushing core is in place, manually pull out the water-grinding drill, manually tap the core to disconnect it from the parent rock, and then manually remove it, and the water-milling drill moves to the next hole to drill.


The drill collar is drilled in the middle part of the core of the excavation area with the YT28 rock drilling rig. The spacing between adjacent holes is 40cm, the hole diameter is 4.2cm, and the number of holes is 42~45. The drill collar can also be set up in the simple platform. In front of the rack, in order to facilitate the construction of the split hole, it can be drilled 2~4m at a time, satisfying 4~8 splitting cycles (about 1.5m for an excavation cycle and about 0.5m for each splitting cycle).


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     The hydraulic splitter splits the core rock body 1 After the core hole is completed, and then the hydraulic plane is used to split and excavate the rock body from the periphery by the hydraulic splitter, and the split rock is split from the top to the bottom. Artificially fallen. The splitting uses a splitter and two operators. According to the development of the surrounding rock fissures, the small guide tunnel splits for about 1 hour per cycle.


      Manually clearing the split rock mass to ensure the safety of the pedestal and hydraulic splitter pipeline and the lower working face. After the splitter splits the rock mass, the split rock mass is manually transported by the ground rock cart to the temporary distance of 10m from the face of the hand. Stacking, according to the site conditions, about 3 operators, after excavating a cycle, use the loader to match the cart to the abandoned market.


      Inspection and acceptance, information feedback Check the construction effect after each cycle, analyze the relevant parameters in time, improve the technical and economic indicators, check whether the subsequent excavation exceeds the design requirements, and compare the construction of the surface buildings before and after the blasting, whether it is damaged by the building.


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