12results about How to "Increase safety reserve" patented technology

The invention belongs to the field of high-burial-depth underground space safety early warning and protection, and discloses a construction method and system for judging and distinguishing double-track tunnel micro-seismic parameter quantitative early warning rockburst grades, and the method comprises the steps: designing a micro-seismic monitoring system sensor arrangement method; wave velocity setting; judging the reliability of the monitoring effect of the same monitoring system on the double-track tunnel; comparing geological revelation conditions of the tunnel faces in the similar mileage sections of the double-track tunnel; determining rockburst grade classification and quantitative judgment criteria; distinguishing and establishing quantitative criteria of high-precision rockburst of each grade of the double-track tunnel; judging whether to distinguish and establish a rockburst early warning judgment standard; unifying tunnel early warning discrimination standard establishment methods; the reliability of the method is judged according to the occurrence condition of subsequent rockburst, and meanwhile the threshold value is perfected. According to the invention, two sections can be monitored at the same time through a set of microseismic monitoring system, so that half of manpower, material and financial investment is saved. The blank of establishing a quantitative criterion method for distinguishing micro-seismic monitoring and early-warning rockburst of the double-track tunnel under similar geological conditions in the same work area is filled, and the method has high practical value.

The utility model relates to the technical field of fabricated steel structure, disclose a kind of fixed structure and the connecting joint of modular steel structure, fixed structure includes at least one first connecting piece, first connecting piece includes plug-in board, connecting plate and support plate, at least one horizontal direction extension slot is provided on plug-in board, connecting plate is fixed in the top side of plug-in board;The plug-in board of each slot lower part is fixed with support plate, and support plate is in contact with steel beam flange plate up and down.The connecting joint of modular steel structure includes fixed structure and second connecting piece, first connecting part inserts and is tightly attached on the inner wall of upper column;Second connecting part inserts and is tightly attached on the inner wall of lower column;Steel beam flange plate inserts each slot, connecting plate is fixedly connected with second connecting piece, and steel beam flange plate is in contact with support plate up and down.The utility model structure is simple, connection is reliable, easy to disassemble, solve the technical problem of the load bearing capacity of weakening steel beam and steel column in the prior art hole, reduce the safety of connecting joint.

The application belongs to the technical field of fabricated wall construction, and particularly relates to a combined ALC window opening outer wall structure and a construction method, comprising a plurality of adjustable connecting assemblies, a plurality of limiting stoppers and at least one ALC wallboard, pretreatment work such as ALC wallboard anchor planting and flat steel welding is completed on the ground in advance, which maximally reduces the content and time of high-altitude work, and through systematic innovation, the construction safety, installation quality and work efficiency are successfully improved in cooperation, the core of which is to transform high-risk and high-difficulty work at high altitude into a safe and controllable prefabrication process on the ground, and relying on an adjustable, anti-loose and strengthened integrated connecting and positioning system, the drawbacks of traditional methods are fundamentally overcome, and the application has the comprehensive advantages of intrinsic safety, precision and efficiency, firmness and reliability, and provides an advanced solution for the construction of the window opening of the fabricated building outer wall.

A steel-concrete structure composite beam belongs to the technical field of building structures. The steel-concrete structure composite beam comprises a reinforced concrete floor slab, the supporting steel plate is fixed at the bottom of the reinforced concrete floor; the steel pipe beam is relatively fixed with the supporting steel plate along the direction parallel to the axial direction of the steel pipe beam through a group of channel steel structures or at least one group of L-shaped steel structures; the L-shaped steel structure and the groove-shaped steel structure are fixedly connected with the supporting steel plate through shear-resistant studs. According to the utility model, the connection mode between the steel pipe beam and the reinforced concrete floor is improved, and the connection reliability is improved.

The invention discloses a production method of a hot-rolled steel plate for a high-grade steel pure hydrogen conveying pipeline. The steel plate comprises the following chemical components in percentage by weight: 0.03-0.06% of C, 0.10-0.20% of S i, 1.10-1.40% of Mn, less than or equal to 0.008% of P, less than or equal to 0.001% of S, 0.040-0.050% of Nb, 0.030-0.040% of V, 0.005-0.020% of Ti, 0.20-0.30% of Cr, 0.10-0.20% of N i, 0.020-0.040% of Al, less than or equal to 1.5 ppm of H, less than or equal to 20 ppm of O, less than or equal to 40 ppm of N and the balance of Fe and impurities. And by combining low-temperature heating and rolling of the plate blank, the produced steel plate has high strength and good hydrogen embrittlement resistance, and the requirements of steel for the high-pressure pure hydrogen conveying pipeline are met.

The present invention discloses a fault fracture zone reinforcement method based on self-expanding slurry, including: determining the position of the fault fracture zone according to geological data and on-site investigation; drilling multiple anchor holes in a direction perpendicular to the fault fracture zone; placing a support pipe with multiple small holes on the side walls of multiple parts in the anchor holes to support the anchor holes; mixing expansive soil, phosphogypsum and cement to obtain a self-made self-expanding slurry; installing a grouting conduit in the support pipe, and injecting the self-expanding slurry into the fault fracture zone through the grouting conduit under high pressure, wherein the periphery of the grouting conduit is provided with multiple guide pipes, which are connected to the small holes of the support pipe; recovering the grouting conduit after the grouting is completed. The present invention relies on the expansibility of the self-expanding slurry to fill the gap inside the fracture zone, increase its internal cohesion, and connect the fault and the fracture zone into a whole, effectively enhancing its overall stability. At the same time, the method makes full use of undesirable substances such as expansive soil and phosphogypsum to avoid environmental pollution.

The invention provides a cable beam suspension structure in a surface hole of a shallow-buried tunnel and a construction method of the cable beam suspension structure, and belongs to the technical field of municipal engineering subsurface tunnel design and construction. According to the technical scheme, the device comprises a double-spliced steel beam which is embedded into a ground surface groove and is perpendicular to the excavation direction, a double-spliced waist beam which is tightly attached to a primary support base plane in a hole and is parallel to the excavation direction, a pre-stressed anchor cable which is tightly buckled with the double-spliced waist beam to suspend a primary support on the double-spliced steel beam, and an anchorage device matched with the pre-stressed anchor cable, the load of the overlying strata is borne by the in-tunnel primary support and the cable beam suspension structure together, and the safety of tunnel support and the stability of surrounding rock can be guaranteed without arranging redundant span-reducing vertical supports and horizontal cross supports in the tunnel. The collapse risk caused by support removing and arch changing operation of a traditional underground excavation construction method and potential safety hazards of driving operation caused by water leakage of a lining of a support burying node can be completely avoided, the cable beam suspension structure can be suitable for various stratums and is basically not restricted by the engineering geological environment, and meanwhile the purpose of rapid support-free construction of large machinery in a hole can be achieved.

This utility model relates to the field of bridge engineering technology, and in particular to a cable-stayed bridge with a Möbius strip-shaped spatial arch tower, comprising a tower, piers, a bridge deck, and a cable system. The bridge deck is erected above the piers, which include main piers and auxiliary piers. The tower consists of a first arch tower and a second arch tower, with their bottom ends overlapping and fixed to the main pier, forming a solidified system with the bridge deck. A structural ring is provided between the first and second arch towers. The cable system includes indirect force-transmitting cables, direct force-transmitting cables, and bridge deck cables, forming a dual force-transmitting mechanism. This utility model incorporates the Möbius strip shape into the tower design, achieving a unity of "infinite loop" visual effect and structural reliability through the structural ring and dual force-transmitting system. It breaks the traditional geometric paradigm of bridge towers, providing a cable-stayed bridge paradigm that combines aesthetic value and structural reliability for urban landmark bridges.

The invention discloses a rough blank design method for improving the uniformity of a centrifugal impeller die forging, and belongs to the technical field of impeller die forging. The problems that in the prior art, due to the fact that centrifugal impeller die forgings are uneven in structure, great hidden dangers exist in safe use of parts, and the forging cost is high are solved. Comprising the following steps that S1, a small deformation area is recognized through the digital simulation technology; S2, a first groove and a second groove are formed in the upper end and the lower end of the small deformation area; S3, the top face of the first groove and the top face of the second groove are obliquely arranged; S4, the outer side walls of the first groove and the second groove are obliquely arranged away from the center lines; the rough blank design method for improving the uniformity of the centrifugal impeller die forging is used for centrifugal impeller die forging, rough blank and forging blank coordinated design is adopted, pre-forging and finish forging complementary deformation is utilized, the structure uniformity of the centrifugal impeller die forging is effectively improved, accordingly, the mechanical property of the centrifugal impeller die forging is improved, meanwhile, the forging cost is reduced, and the product quality is improved. The production efficiency is improved.

The invention relates to the technical field of structure testing, and particularly discloses a steel-concrete combined arch bridge joint test piece strength detection experiment method and a test method.The test piece comprises a joint plate, chord member profile steel and a steel truss web member, the joint plate comprises a first connecting rod and two second connecting rods, and the two second connecting rods are located in the middle of the first connecting rod; the two second connecting rods are symmetrical along the length center line of the first connecting rod; the first connecting rods and the chord member profile steel are fixedly connected to form a chord member framework, a reinforcement cage is arranged outside the chord member framework, penetrating steel bars are fixedly connected between the two parallel edges of the reinforcement cage, and the chord member framework and the reinforcement cage are wrapped with concrete and form a chord member; the second connecting rods and the steel truss web members are fixedly connected to form web members, and sensors are bonded to the chord members and the web members. The objective of the invention is to solve the problem that the prior art is lack of means for testing the reliability of a novel arch bridge structure of a steel truss web member concrete combined arch ring.

The invention relates to the technical field of floor support reinforcement, in particular to a method for improving the strain lag influence of floor support reinforcing ribs, which comprises the following steps of: chiseling off a floor protective layer in a reinforcing area at a plate support, and paving a plurality of reinforcing ribs on the reinforcing area of the plate support without the floor protective layer, the end parts of the reinforcing ribs are embedded into the floor drill holes by adopting anchoring embedded steel bar glue; a supporting rod is arranged between every two adjacent reinforcing ribs, the two reinforcing ribs are transversely clamped into a broken line shape through a clamping tool, the reinforcing ribs are forced to be bent from straight to generate tensile strain, the reinforcing ribs are bound after prestress application is completed, structural interface glue is brushed on a floor slab protection layer, a C30 fine aggregate concrete laminated layer with the thickness being 40 mm is poured, and the floor slab protection layer is vibrated compactly. The clamping tool is used for transversely clamping the two reinforcing ribs into a broken line shape, the reinforcing ribs are forced to be bent from straight to generate tensile strain, the influence of strain lag of the reinforcing ribs is eliminated or reduced, and therefore the effect of the reinforcing part is fully exerted, and the safety reserve of the bearing capacity of the floor support is improved.

The invention discloses a sidewalk limited area profile steel cantilever bridge based on space optimization and a construction method thereof, and belongs to the technical field of cantilever sidewalk construction.The sidewalk limited area profile steel cantilever bridge comprises cantilever units arranged in the longitudinal direction of a road, and each cantilever unit comprises a profile steel main beam arranged in the transverse direction; an anchoring section of the profile steel main beam is arranged in a road structure and is wrapped by concrete to form a concrete anchoring body, a reinforcement cage is arranged on the outer side of the anchoring section, the reinforcement cage is integrally embedded in the concrete anchoring body, and bending moment and shearing force generated by a cantilever section of the profile steel main beam form a multi-path collaborative stress system through the profile steel main beam and the reinforcement cage. And the load is transmitted to the original road structure, so that the safe overhanging arrangement of the sidewalk is realized under the condition that a lower foundation does not need to be arranged. The problems that under the condition that the construction space of a sidewalk is limited, especially in areas close to rivers, valleys and other areas with limited space, the difficulty is large, and the manufacturing cost is high when a concrete structure is constructed from the valley bottom are solved.