31results about How to "Reduce large deformation" patented technology

The invention discloses a pressure-relief support coordination control method for a deep high-stress tunnel based on borehole pressure relief. The method comprises three steps according to a time sequence, and the three steps are respectively a primary pressure relief support step, a borehole pressure relief step and a secondary high-strength anchor grouting support step. According to the pressure-relief support coordination control method for the deep high-stress tunnel based on borehole pressure relief, surrounding rock deformation in each stage is controlled by adopting different support and reinforcement methods according to difference of surrounding rock deformation ways in different stages after the tunnel is excavated, the support performances of surrounding rocks and supporting structures are fully played, and large deformation of the surrounding rocks of a deep high-stress tunnel is reduced, so the stability of the tunnel can be maintained for a long time. Meanwhile, the method disclosed by the invention is capable of effectively reducing the repair rate of the tunnel, alleviating the labor intensity of workers and lowering the comprehensive support cost of a mine.

The invention discloses a method for forging a large steel shaft forging. The method comprises the following steps of: performing cogging, chamfered edge rounding, whole stretching for the first time, whole stretching again, section-by-section forging and the like on a medium carbon steel standard octagon ingot of which the carbon content is 0.3 to 0.4 percent. The step of whole stretching for the first time comprises the following steps of: heating a forged piece to a primary forging temperature; stretching on a forging hammer with a flat anvil; and reaching the deformation rate of 29 to 31 percent at the effective hole welding temperature of over 900 DEG C so as to overcome internal defects of the forged piece. The step of whole stretching again comprises the following steps of: heating the forged piece to the primary forging temperature; stretching on the forging hammer with the flat anvil; and reaching the deformation rate of 15 to 20 percent at the final forging temperature of 800 DEG C. And the single-time deformation rate of each section when the section-by-section forging is performed should not be less than 20 percent. The method of the invention effectively overcomes the internal defects of the material, reduces the material and working time waste, more reasonably distributes the deformation rate of each step, contributes to the reduction of the forging deforming force and realizes ideal material mechanical property.

The invention relates to the technical field of tunnel construction, in particular relates to a support frame, a support structure and a construction method of the support structure, and provides a support frame which is formed by sequentially connecting a plurality of support segments in cycle, wherein hole grooves are formed in two ends of each support segment; adjacent support segments are connected through a first sleeve; the first sleeve is a hollow circumferential sleeve which is matched with the support segments in size; mounting holes are formed in two ends of the front wall surface and the rear wall surface of the first sleeve corresponding to the hole grooves; a second sleeve is a cross-shaped sleeve which comprises the circumferential sleeve similar to the first sleeve and two longitudinal sleeves which are symmetrically arranged at the centers of the front side wall and the rear side wall of the circumferential sleeve; energy-dissipation presplitting slots are formed in the middle parts of two ends of the left wall surface and the right wall surface of the circumferential sleeve. The support structure formed by combining the first sleeve and the second sleeve is reasonable in design and convenient to construct, and can effectively adapt to large deformation of a surrounding rock; the clearance-intrusion risk of the local large deformation of a tunnel is reduced; the overall stability of a primary lining support structure is improved; and the subsequent treatment cost of the engineering is reduced.

The invention relates to the field of tunnel support, in particular to a construction method suitable for a soft rock bedding tunnel, which comprises the following steps: S1, excavating reverse-tilting upper step core soil, and constructing a first support system; S2, excavating core soil of the lower step of the reverse side, and constructing a second supporting system; S3, excavating upper stepcore soil along the inclined side, and constructing a third support system; S4, excavating core soil of the lower step along the inclined side, and constructing a fourth support system; and S5, disassembling the temporary support, and constructing a secondary lining. According to the construction method, reasonable excavation steps and supporting structures are adopted in a targeted mode accordingto the bias deformation characteristic of the bedding tunnel and the surrounding rock stability difference, deformation during tunnel construction can be effectively controlled, surrounding rock self-bearing is given to full play, the surrounding rock stability is improved, and therefore the construction risk and the engineering cost are reduced.

The invention discloses a combined type multifunctional quenching clamp and belongs to the technical field of machine manufacturing vacuum heat treatment production operation. The combined type multifunctional quenching clamp comprises a main material frame and lifting rings. The lifting rings are welded to the two ends of the top of the main material frame correspondingly. C-shaped reinforcing ribs are welded to the surface of the side wall of the main material frame. Multiple C-shaped reinforcing ribs are arranged. Hook bases are arranged on the surfaces of side heads of the C-shaped reinforcing ribs correspondingly. According to the combined type multifunctional quenching clamp, workpieces are partitioned by means of through holes, multiple carrier plates carry out quenching treatment on the multiple workpieces, uniformity of workpiece heating is improved obviously, the uniformity of the quenching cooling process is improved, heat treatment hardness, strength, impact value and othermechanical performance of the workpieces reach the optimal level, the defects that when workpiece original furnace charging amount is large, quenching hardness is not uniform, soft points exist, andthe service life is short are effectively eliminated, the shaft workpieces are vertically clamped and fixed through through holes in the carrier plates, and thus the shaft workpieces can be fixed moreconveniently.

Provided are an integral support system and a construction method of a rock pillar in a double-hole tunnel. Upper grouting bolts are anchored on left and right sides of the upper portion of the rock pillar in the tunnel, a horizontal pre-stress grouting bolt is horizontally anchored and penetrates through the middle of the rock pillar in the middle of the tunnel, lower grouting bolts are anchoredon the left and right sides of the lower portion of the rock pillar in the tunnel, the anchor heads of each bolt have appropriate exposed lengths, a plurality of mounting holes adapted to each bolt exposed end are formed in circumferential steel strips and longitudinal steel strips, a plurality of the circumferential steel strips are circumferentially arranged along the inner wall of the tunnel, the mounting holes on the circumferential steel strips respectively tightly sleeve the exposed ends of the corresponding upper grouting bolt, the horizontal pre-stress grouting bolt or the lower grouting bolt, a plurality of the longitudinal steel strips are arranged in the axial direction of the tunnel, the mounting holes of the longitudinal steel strips respectively tightly sleeve with the exposed ends of the corresponding bolts, and the exposed ends of the bolts are screwed with locking nuts. The construction method has simple construction process, is easy to operate, and especially has a significant effect on the support of a broken rock body.

The invention discloses a method for controlling roadway surrounding rock deformation under the condition of opposite stoping and tunnelling of close-range coal seams, and the method is used for the field of mining-induced stress control methods for opposite stoping and tunnelling of the close-range coal seams. The mining-induced stress control methods corresponding to three types of conditions include: the mining-induced stress control method for opposite stoping and tunnelling of the corresponding coal seam, the mining-induced stress control method for lower stoping and upper tunnelling of the adjacent coal seam, and the mining-induced stress control method for upper stoping and lower tunnelling of the adjacent coal seam. The technical problems of roadway large deformation, low roadway support efficiency and high support cost under the influences of stoping are effectively solved; and it can be seen that the roadway large deformation phenomenon is reduced by 70%, the support efficiency is improved by 20%, and compared with the prior art, the support cost is lowered to 60%.

The invention relates to a traffic tunnel surrounding rock cooperative control system and a construction method thereof. The traffic tunnel surrounding rock cooperative control system comprises a quick-setting slurry layer, a flexible explosion-proof energy absorption layer, a rigid guard plate layer and a rigid arch frame which can be sequentially arranged from the inner wall of a tunnel to the inner space of the tunnel, and a plurality of telescopic pieces are arranged between the flexible explosion-proof energy absorption layer and the rigid guard plate layer; a gap between the flexible explosion-proof energy absorption layer and the rigid guard plate layer is filled with a flexible material; and the flexible explosion-proof energy absorption layer can be fixedly connected with surrounding rock through anchoring pieces, and the anchoring pieces can be inserted into the surrounding rock. Through a supporting structure, the problem of surrounding rock large deformation faced by a traffic tunnel can be effectively prevented and controlled.

The invention discloses a micro-disturbance mechanical separate tunneling construction method for a tunnel in weak surrounding rock. The method comprises the following steps: firstly, a shield is divided into multiple sub-shields from top to bottom, the multiple sub-shields are jacked gradually from bottom to top, and disturbance to the surrounding rock is reduced; then step separate excavation isperformed on a tunnel face, excavation disturbance is reduced as compared with overall excavation, surrounding rock deformation is controlled, tunnel deformation is prevented, and construction safetyis improved; secondly, the excavated tunnel is subjected to primary support with prefabricated members, and rapid sealing and primary support reinforcement are realized; finally, secondary lining isperformed on the primary support, and waterproof plates are arranged between the secondary lining and the primary support. The construction method is safe, efficient and economical, effectively controls large disturbance and large deformation of surrounding rock during excavation and reduces disaster losses of engineering construction.

The invention relates to a blow molding preparing method for a plastic film. A blow molding preparing device for the plastic film is used. The blow molding preparing device for the plastic film comprises a guide frame, an extruding machine, a guiding and fixing device, a traction device and a cutting device. The extruding machine is installed at the lower end of the interior of the guide frame. The guiding and fixing device is arranged above the extruding machine. The traction device is arranged on the right side of the guiding and fixing device. The cutting device is arranged between the traction device and the cutting device. By means of the blow molding preparing method for the plastic film, a multiple guiding and fixing design concept is adopted for conducting plastic film production,an adaptive guiding, clamping and fixing structure is adopted for the upper and the lower end of the initial-stage tubular plastic film, the forming size of the tubular plastic film and the completeness of the whole body of the plastic film are ensured, and the forming quality of the tubular plastic film is improved.

The invention discloses a setting method of a metal vacuum-smelting reduction pot in a reduction furnace and a reduction furnace constructed by using the method. The sealing end of the reduction pot downwards and the material inlet of the reduction pot upwards are tipsily positioned in the reduction furnace. The sealing end of a reduction pot (3) is supported on a support saddle (5) arranged in a reduction furnace kiln body (1). The material inlet of the reduction pot (3) is supported on a position which is higher than the support saddle (5) on the reduction furnace kiln body (1). A crystallizer (2), which is connected with the material inlet of the reduction pot, is positioned outside the reduction furnace kiln body (1). The angle between the reduction pot (3) and a horizontal plane is 3-30 degrees. The invention solves the problems of inconvenience of adding materials of the existing reduction pot, small feeding amount, and great labor intensity when workers add materials, large deformation of the reduction pot and deficiency in energy utilization.

The invention provides a detection method of a cooperative effect generated in anchoring body under an anchor pole cooperative reaction, belonging to a detection method of a cooperative effect generated under a cooperative reaction. The detection method comprises a step of selecting a model test piece material, making a model test piece, and determining the detection method of an anchoring body cooperative reaction under a pre-tightening force anchor pole effect through the model test piece, a step of detecting the shape, range and evolution rule of the anchoring body, a step of determining detection data, a step of establishing a corresponding relation between the cooperative reaction and tunnel surrounding rocks stability control through cooperative effect calculating, obtaining and evaluating the anchoring body cooperative effect, realizing a condition that the macroscopic function of a cooperative anchoring system is larger than the linear superpose sum of each sub system, and improving the stress state of a tunnel surrounding rocks anchoring structure. The detection method has the advantages that the bearing ability of the tunnel surrounding rocks anchoring structure can be substantially improved, the distribution shape, range and development evolution rule of the anchoring body cooperative effect are obtained, and the anchoring body intensity, rigidity, bearing ability, and anti-deformation ability are improved.