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56results about How to "Reduce local damage" patented technology

Composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of underground coal mine

The invention discloses a composite fracturing and uniform permeability-improving method for tree-like boreholes in coal seams of an underground coal mine. The composite fracturing and uniform permeability-improving method is suitable for permeability improvement of soft low-permeability coal seams, and is characterized in that a gas exhausting and mining hole serve as a mother hole, uniformly distributed self-advancing boreholes serve as tree-like son boreholes, and a tree-like borehole net is subjected to hole-sealing fracturing. Compared with a conventional hydraulic fracturing method, the composite fracturing and uniform permeability-improving method can realize uniform fracturing of the low-permeability coal seams to enlarge the fracturing range of single crossing boreholes, so that uniform permeability improvement is achieved, and the shortcomings that the crossing boreholes subjected to conventional hydraulic fracturing are low in utilization ratio, and a single major fracture can damage top and bottom beds are overcome. The composite fracturing and uniform permeability-improving method is simple to operate, large in permeability improvement range and good in permeability improvement effect and provides a guarantee for safety production of the underground coal mine.
Owner:CHONGQING UNIV

Hole flushing device for coal mine downhole gas extraction drill holes

The invention provides a hole flushing device for coal mine downhole gas extraction drill holes. The hole flushing device comprises a water tank, a high-pressure pump, a high-pressure hard pipe, a high-pressure hose, a self-propelled drill bit, a base, a winch, a pushing mechanism and the like. The winch and the pushing mechanism are fixed to the base. The device can correspond to the drill holes in different positions and at different angles by adjusting all parts of the base. The high-pressure hard pipe can penetrate through the pushing mechanism before being fed into the drill holes. The high-pressure hard pipe can be conveyed forwards along the drill holes through pushing force provided by the pushing mechanism. When high-pressure water passes through the high-pressure hose at the front end of the high-pressure hard pipe and the self-propelled drill bit, high-pressure water jet is generated to conduct rock breaking dredging on collapsed and blocked portions, and self-propelling force is generated. The device is simple in structure, small in overall size and convenient to adjust, and can be conveniently used in coal mine downhole narrow working space. A whole power pipeline can be conveyed in long distance under joint acting force of pulling in front and pushing behind, and the pipeline can be prevented from being clamped. The hole flushing speed is high, efficiency is high, cost can be greatly reduced, and the gas extraction effect is improved.
Owner:CHONGQING UNIV +1

Transverse-direction low-yield-point energy dissipation type steel bridge anti-seismic stop block structure and arranging method

The invention discloses a transverse-direction low-yield-point energy dissipation type steel bridge anti-seismic stop block structure and an arranging method. The bridge anti-seismic stop block structure comprises a steel corbel, a stop block body and a steel frame, wherein the steel corbel is fixed to the side face of the top of the portion, nearby a movable support, of a bridge pier, the stop block body is fixed to the steel corbel, and the steel frame is fixed to the bottom of a bridge body. The anti-seismic stop block structure is arranged nearby each movable support, the collision positions are disperse, multiple anti-seismic stop block structures are arranged, therefore, the seismic force acting on each stop block structure can be effectively decreased, and then local damage of the stop block structures can be reduced; each stop block body comprises an energy dissipation type low-yield-point steel plate. According to the bridge anti-seismic stop block structure, large displacement between beam bodies and the bridge piers can be effectively limited, and damage of the movable supports and expansion joints can be reduced; under the action of a violent seism, not only can local damage of the collision areas and damage transmitted to the bottoms of the bridge piers be effectively reduced, but also part of seismic energy can be dissipated by means of plastic deformation of the energy dissipation type low-yield-point steel plates arranged in the stop block bodies.
Owner:NANCHANG UNIV

Three-way limiting buffering bridge anti-seismic stop dog structure and arranging and installing method

The invention discloses a three-way limiting buffering bridge anti-seismic stop dog structure and an arranging and installing method. The bridge anti-seismic stop dog structure comprises a steel corbel, a stop dog lower structure and a stop dog upper structure; the steel corbel is fixed to the side face, in the bridge axial direction, of the top of a pier close to a bridge movable supporting base, the stop dog lower structure is fixed to the top of the steel corbel through bolts, a groove is formed in the lower portion of the stop dog upper structure, the stop dog upper structure is fixed to the bottom of a main beam of the bridge through bolts, and an impact block is arranged on the upper portion of the stop dog lower structure. Relative large displacement between a beam body and the pier in the bridge axial direction, bridge transverse direction and vertical direction can be effectively limited, damage to the movable supporting base and expansion joints is reduced, and the beam body is prevented from falling in the bridge axial direction and bridge transverse direction and prevented from vertically getting away from the supporting base to cause damage on the supporting base, beam cocking damage and vertical impact damage between the beam body and the supporting base. The three-way limiting buffering bridge anti-seismic stop dog structure is simple in structure, convenient to construct, easy to repair and replace and suitable for new and old bridges.
Owner:NANCHANG UNIV

Post-tensioning self-resetting joints capable of multi-stage energy dissipation and assembling method for post-tensioning self-resetting joints

The invention discloses post-tensioning self-resetting joints capable of multi-stage energy dissipation and an assembling method for the post-tensioning self-resetting joints. The joints can slide relative to one another, and provide energy dissipation under small deformation through a mode of unilateral friction between a T-shaped piece and a beam flange, with increasement of deformation of openings of the joints, an SMA damper connected with a T-shaped plate begins to enter a phase transition energy dissipation phase, and introduced metal damping cannot increase residual deformation of the joints at the same prestress level; and for avoiding the characteristic of low redundancy of the post-tensioning joints, contact pressure-bearing of a bolt rod connecting the T-shaped piece and the beam flange and the oblong hole wall of the beam flange is allowed through an oblong hole, and under extreme conditions, collapse can be effectively resisted. According to the post-tensioning self-resetting joints, under small to middle seisms, friction damping is used for energy dissipation, energy dissipation in a combined energy dissipation mode can be realized by cooperating with SMA phase transition under middle to large seisms, and by means of post-tensioning prestress reinforcements, complete resetting is realized; and under the extreme conditions, joint force transfer is transformed intocollapse resistance in a hole wall pressure-bearing mode, and multi-stage energy dissipation and the multi-redundancy property are realized.
Owner:CHONGQING UNIV +1

FRP (fiber reinforce plastic) tube-concrete-multiple steel tube hollow combined single-box or multi-box multi-compartment beam

The invention discloses a FRP (fiber reinforce plastic) tube-concrete-multiple steel tube hollow combined single-box or multi-box multi-compartment beam, which is composed of an outer FRP tube, built-in steel tubes and concrete, wherein the concrete is arranged between the two layers; the outer FRP tube is in a single-box or multi-box multi-compartment beam form; the number of the built-in steel tubes is equal to or greater than two; and the longitudinal central axes of the built-in steel tubes are arranged in the outer FRP tube in an axial symmetry mode so as to form a hollow combined single-box or multi-box multi-compartment beam. The beam disclosed by the invention is in a single-box multi-compartment beam or multi-box multi-compartment beam combined form, so that the integrity, torsional stiffness and stability of a combined member can be effectively improved, thereby improving the unbalanced load and horizontal load bearing capacities of the combined member; the combined member has good ductility and earthquake resistance; the member is externally coated with a corrosion-resistant material FRP, so that the built-in steel tubes and concrete are effectively protected, therefore, the member has good durability, and low later-period maintenance costs; and the member also has the advantages of light self-weight, convenience in construction, and the like, and has a broad application prospect in areas with high requirements on durability and earthquake resistance.
Owner:GUANGDONG UNIV OF TECH

Anti-overturning structure additionally arranged for existing single-pier bridge

The invention discloses an anti-overturning structure additionally arranged for the existing single-pier bridge, which comprises a main beam, a single pier used for supporting the main beam, small bent caps arranged on the two sides of the single pier and check block bodies arranged at the outer ends of the two sides of the upper portions of the small bent caps, and steel springs connected with the check block bodies are arranged between the check block bodies and the side wall of the main beam. An anti-overturning support and an NV rubber mudguard are arranged between the small bent cap and the main beam, and the two ends of the anti-overturning support are connected with the top of the small bent cap and the bottom of the main beam respectively; the bottom of the NV rubber mudguard is connected with the top of the small bent cap in an anchored mode. By reducing the overturning moment of the bridge in the transverse direction and the energy absorption and buffering effects of the NV rubber mudguard, the anti-overturning force of the bridge is additionally provided through the elastic force of the steel spring, so that the anti-overturning capacity of the bridge is enhanced, the stress condition of the bridge is improved, and potential safety hazards of an existing bridge are eliminated.
Owner:NANCHANG UNIV

Folding noise reduction protective fence for intelligent traffic

The invention discloses a folding noise reduction protective fence for intelligent traffic, and belongs to the technical field of traffic safety facilities. The folding noise reduction protective fence comprises a supporting assembly, the top of the supporting assembly is fixedly connected with a first buffer assembly, the first buffer assembly is applied to primary buffer protection, and the surface of the first buffer assembly is fixedly connected with an outer protective assembly. According to the protective fence, through mutual cooperation of the designed supporting assembly, the first buffer assembly, a sound insulation assembly, a second buffer assembly, a pressure conversion assembly and other structures, the situation that the whole protective fence is directly damaged due to the fact that the borne impact force is too large can be avoided, the rigid impact force is relieved after stress is borne, the impact force is slowly counteracted, the damage to the persons in vehicles and the protective fence can be reduced to the maximal degree, an air bag can rotate in a third bearing through a third adapter shaft, so that the overall stress of the outer protective assembly is realized, the local damage of the outer protective assembly after the outer protective assembly is impacted can be reduced, and a better protection effect is achieved.
Owner:深圳聚创致远科技有限公司

Bridge prefabricated may reset energy dissipation anti-seismic check blocks

PendingCN110565503ASmall residual deformation after earthquakeReduce the difficulty of repairBridge structural detailsBackplaneGeotechnical engineering
The invention relates to a bridge anti-seismic chock block invention field, and specifically relates to a bridge prefabricated may reset energy dissipation anti-seismic check blocks. The device comprises a back plate, a front plate, a U-shaped plate, a connecting rod, a spring, a soft steel, a bolt, a gasket, a stiffening rib, a bolt hole, a track; the front plate back plate consists of a plurality of sleeved with a spring, the connecting rod and the front plate are welded, the other end of the connecting rod passes through the corresponding hole on the back plate through a bolt after the backing plate at the limit connecting rod is pulled out of the back plate, the left side and the right side plate of the U-shaped plate is provided with a plurality of bolt holes, the baffle block throughthe bolt connected to the cover beam, and this connection can be fabricated connection mobility. According to the device, compared with the traditional stop block, the structure is simple, the stressis clear, the conventional check block and a main beam of the rigid collision into flexible collision, slowing down the seismic action on the main beam and the baffle block, reducing the impact of the stop block and the local damage of the main beam.
Owner:NANCHANG UNIV

Borehole washing device for gas drainage drilling in coal mine

The invention provides a hole flushing device for coal mine downhole gas extraction drill holes. The hole flushing device comprises a water tank, a high-pressure pump, a high-pressure hard pipe, a high-pressure hose, a self-propelled drill bit, a base, a winch, a pushing mechanism and the like. The winch and the pushing mechanism are fixed to the base. The device can correspond to the drill holes in different positions and at different angles by adjusting all parts of the base. The high-pressure hard pipe can penetrate through the pushing mechanism before being fed into the drill holes. The high-pressure hard pipe can be conveyed forwards along the drill holes through pushing force provided by the pushing mechanism. When high-pressure water passes through the high-pressure hose at the front end of the high-pressure hard pipe and the self-propelled drill bit, high-pressure water jet is generated to conduct rock breaking dredging on collapsed and blocked portions, and self-propelling force is generated. The device is simple in structure, small in overall size and convenient to adjust, and can be conveniently used in coal mine downhole narrow working space. A whole power pipeline can be conveyed in long distance under joint acting force of pulling in front and pushing behind, and the pipeline can be prevented from being clamped. The hole flushing speed is high, efficiency is high, cost can be greatly reduced, and the gas extraction effect is improved.
Owner:CHONGQING UNIV +1
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