33results about How to "Additional load is small" patented technology

The invention relates to the technical field of coal mine mining, in particular to a non-coal-pillar auto-roadway-forming mining method suitable for thick-seam fully mechanized top coal caving. The method includes the following steps that reinforcing and supporting are carried out on a roof and two walls of a roadway; roof cutting explosion is carried out to form a pre-cracking seam; a temporary supporting device in the roadway and a gangue blocking device are erected along a retained entry; coal caving is not performed within a preset distance to the working face end close to the entry retaining side; after the roadway is stabilized, the temporary supporting device in the roadway is removed, a goaf is closed, and the entry retaining is completed. The roof cutting explosion better facilitates collapsing of the rock stratum in the goaf, the stoping space can be well filled after the rock stratum in the seam is collapsed, a short arm beam structure is formed in the lateral direction of the entry-retaining roof, a long suspended roof formed in the goaf is avoided, and the surrounding rock stress of the gob-side entry is improved; coal caving is not performed within a certain range ofthe working face end of the entry retaining side, the filling effect of the empty area of the entry retaining side is further guaranteed, rotary sinking of basic top block bodies is effectively limited, and the influence on the entry retaining stability is greatly reduced.

The invention discloses a caisson and pile combined foundation of consolidated subsoil and a construction method of the caisson and pile combined foundation. The caisson and pile combined foundation of the consolidated subsoil comprises the consolidated subsoil, a sand-gravel cushion, a caisson, bored piles, pile bottom grout, top seal concrete and scour protection. The main construction method comprises the following steps: consolidating the foundation with an underwater compaction sand pile or a deep-layer cement mixing pile; laying the sand-gravel cushion on the consolidated subsoil; sinking the caisson with a skirt, pile sinking guide holes and grouting reserved pipes on the sand-gravel cushion; after the caisson is located, constructing bored piles through the pile sinking guide holes; after construction of the bored piles, casting the top seal concrete at the bottom in the caisson; grouting the bottom of the caisson through the grouting reserved pipes at the bottom of the caisson, carrying out pile bottom grouting through grouting pipes in the pile, and at last casting the top plate of the caisson. In the construction process, the scour protection shall be performed around the caisson according to requirements. The caisson and pile combined foundation of the consolidated subsoil and the construction method of the caisson and pile combined foundation, disclosed by the invention, can effectively improve vertical and horizontal bearing capacity of the caisson, and control sedimentation and horizontal displacement of the caisson.

The invention discloses a method for grouting polymers for tunnel protection. According to the method, a polymer material is grouted to the periphery of the lining structure of a tunnel aiming at dissolved cavities existing in tunnel surrounding rock or cavities caused by collapse of a tunnel, and the polymer material expands rapidly after a reaction to form a polymer buffer layer in the cavity at the periphery of the lining structure, thereby preventing rocks above the tunnel from falling to impact the tunnel lining. The method has the advantages of strong pertinence, good controllability, no disturbance to the lining, rapidness in construction, simple process, high efficiency and the like. Therefore, the polymer material with light weight and good elasticity has been successfully applied in the tunnel engineering, and shows the huge economic and social benefits and wide application prospect.

The invention relates to the technical field of civil engineering foundation reinforcing of industrial and civil construction projects, in particular to a pile foundation underpinning method for a building foundation adjacent to a deep foundation pit. The method includes the steps of firstly, investigating and designing, to be more specific, investigating the existing building, selecting foundation underpinning pile types according to building foundation size, buried depth, distance between the building foundation and the deep foundation pit and the depth of the deep foundation pit, calculating to determine the required length and number of foundation underpinning piles according to bearing capacity, allowing the foundation underpinning piles to exceed the depth of the bottom of the deep foundation pit, and completing ring beam design; secondly, pressing the piles at the edges of the building foundation; thirdly, performing pile foundation underpinning on the building foundation. The method has the advantages that the building foundation satisfies the requirements of bending resistance, punching resistance and shearing resistance by the aid of pile foundation underpinning, natural foundation bearing of the building foundation is changed into pile foundation bearing, additional load of the building foundation to the deep foundation pit is lowered greatly, sedimentation and horizontal displacement of the building foundation adjacent to the deep foundation pit are solved, and factory building safety is guaranteed.

The invention provides a deployment method of a fused video channel for balancing channel resources and coordinating cloud delay and local loads in a self-adaptive manner for a video application witha shared interactive load characteristic. The method comprises the following steps: firstly, a shared interactive system with a fused video live broadcast function is realized based on WebRTC and OpenCV; on the basis of the system, the three processes of application dissociation and independence are subjected to experiments, and a shared interactive resource-load model is obtained. On the basis,the channel resource load is estimated on the basis of the model, an admission control strategy is realized through a greedy heuristic algorithm based on a utility ratio, an admission priority sequence of the channel is generated, and a basis is provided for maximizing the system bearing capacity. In the deployment stage, firstly, a server for the channel is selected according to the principle ofminimum total delay for initial placement. Adaptive load balancing is carried out, and the load-delay model of the server is combined; a part of CPU load is released to the terminal so as to realize load-delay balancing between the terminal and the cloud end.

The invention relates to a high-rise structure floor slab shock absorption structure releasing multi-direction freedom degrees. The floor slab shock absorption structure comprises a body stress frame and a buffering damping mechanism arranged in the body stress frame and applying a tuning function on the body stress frame; the body stress frame comprises a foundation slab, shear walls vertically arranged on the foundation slab and rigid cross beams arranged at the tops of the shear walls, the buffering damping mechanism comprises floor slabs arranged on multiple layers in parallel at equal intervals and elastic buffering units arranged around the floor slabs, and the floor slabs are connected with the shear walls through the elastic buffering units in a sliding mode. Compared with the prior art, the shock absorption structure is simple in structure and compact in layout; as viscous dampers are arranged in the four directions of the body stress frame, and rolling wheels are arranged in the four directions of the floor slab, the multi-direction freedom degrees of the floor slabs can be released, the shock absorption effect is excellent, and the shock absorption structure has excellent application prospects.

The invention discloses a steel and wood buckling energy consumption support and belongs to the technical field of structural engineering. The buckling energy consumption support comprises a core force bearing steel plate, a periphery constraint part and a no-bonding layer, wherein the main body part of inner core force bearing steel plate is in a linear shape. Connecting sections and transition sections at the two ends of the inner core force bearing steel plate are welded to an auxiliary connecting plate to form a cross-shaped cross section. The periphery constraint part is composed of a wood block wrapped with a steel plate and a CFRP material wrapped transversely in the length direction of a member together. The no-bonding layer is arranged between the core steel plate and the constraint wood block. The invention belongs to the technical field of civil engineering structural damping. Hysteretic energy performance of the steel support member under the effect of a strong earthquake is obviously improved. Compared with the prior art, the process of twining the CFRP outside is adopted in the steel and wood buckling energy consumption support, the structure is compact, the economical and practical effects are achieved. A constraint unit is made of light weight timber, so that the shortcoming that the self weight of a traditional buckling preventing energy consumption support is large is overcome. The steel and wood buckling energy consumption support is easy to machine, is convenient and flexible to use, and has wide market popularizing prospects.

The invention discloses a box culvert construction method for broadening a road and a box culvert, the method comprises the following steps: calculating additional stress caused by self weight of a box culvert structure, and when the additional stress is greater than a first preset threshold, digging a soil layer with a certain thickness downwards; wherein the optimal thickness range is 1-3m, and then the road to be broadened above the tunnel is formed; performing filling on the two sides of the road to be widened and the outer side of the tunnel, and the filling boundary is a stable slope which forms a downward 30-degree included angle with the vertical direction and is tangent to the bottom edge of the tunnel; and constructing the box culvert with the stable slope and the side slope face as boundaries. According to the box culvert construction method for widening the road, the roadbed filling load of a newly-built widening road is reduced, the additional load of a tunnel structure and disturbance of tunnel surrounding rock are reduced, tunnel structure deformation cracking and differential settlement caused by filling construction above the tunnel are avoided, and the box culvert construction method has the advantages of being fast in construction, high in reliability and good in durability.

A speed control method for an automatic transmission adapted to a power train apparatus (1) for a hybrid vehicle having an engine (2), a motor-generator (4), the automatic transmission, and a speed control device (7,27,47,57) controlling the automatic transmission based on a throttle opening degree (A) of the engine and an output rotation number (NO) of the automatic transmission, the speed control method executed when the electricity is simultaneously generated while the vehicle is driven by the engine, includes a power generation torque calculating process (S5) of calculating a power generation torque (TG) necessary for the motor-generator to generate a required electricity, an output torque calculating process (S6) of calculating an output torque (TE), a drive torque calculating process (S7) of calculating a drive torque, a throttle opening degree during power generation-calculating process (S8) of calculating a throttle opening degree-during power generation, and a speed control process (S9) of controlling the automatic transmission based on the throttle opening degree-during power generation.

The invention belongs to the technical field of engineering structure vibration reduction, and particularly relates to a multidirectional tuning type energy absorption and vibration reduction device. The inertial-capacitance type multidirectional tuning type energy absorption and vibration reduction device comprises a mass block, a transmission device and a rotating device, wherein the mass block is connected with the rotating device through the transmission device. According to the inertial-capacitance type multidirectional tuning type energy absorption and vibration reduction device, the structure form of the mass block is changed so as to realize the inertial-capacitance effect, the mass tuning mode of the vibration reduction device is improved, and the energy absorption and energy consumption efficiency of the vibration reduction device is improved.

The invention discloses a concrete overpass bridge protection device and an anti-collision reinforcing method thereof. The concrete overpass bridge protection device structurally comprises studs and an anti-collision layer. The studs are fixed to the side faces and the bottom face of the concrete overpass bridge in a steel bar planting mode, and the studs are connected with the anti-collision layer and the concrete overpass bridge. The anti-collision reinforcing method is simple and convenient in process, damage to the overpass bridge is small, the original bearing capacity of the overpass bridge is prevented from being affected, work can be carried out under the condition that under-bridge traffic is not closed, and construction is rapid; and the anti-collision layer and the overpass bridge can be prevented from being disengaged, and under the condition of the same strength, the anti-collision layer is smaller in thickness and lighter in self weight, and the load amplification on the overpass bridge is very small. When collision occurs, the ultra-high performance concrete anti-collision layer is firstly collided, dissipation of impact kinetic energy can be increased, impact force can be effectively buffered, even under extreme collision, it can be guaranteed that a damaged part does not fall off, the overpass bridge does not collapse, and secondary accidents are avoided.