41results about How to "Low reinforcement cost" patented technology

The invention discloses a deformation control method when a shield traverses a building within a short distance. The deformation control method comprises the following steps of: firstly, analyzing effects of shield tunneling on a stratum and the building under the conditions of different support pressure ratios and different grouting effects by using a numerical analysis method, and putting forward an optimal support pressure ratio and demands on slurry property; secondly, reinforcing shielding excavation surface stability control, improving muck inside a pressure chamber into be at a liquid-plastic state by a muck conditioning mode, reducing fluctuation of pressure control, and controlling overexcavation by comparison of actual slag quality and theoretical slag quality; and finally, reinforcing wall grouting liquid performance control, and timely filling a shield tail gap without loss of slurry by adopting high-intensity slurry with thixotropy. In a shield tunneling process, security monitoring can be reinforced; a shield tunneling parameter can be timely adjusted, and the security of an adjacent building is ensured. According to the method, a large amount of stratum reinforcing expense is reduced, and an underground space is utilized relatively effectively.

The invention relates to a method for reinforcing an underwater structure by using fiber reinforced composite material lattice ribs, which comprises the following steps: treating the concrete surface of the underwater structure to be reinforced; coating at least one layer of the fiber reinforced composite material lattice ribs on the surface of the underwater structure to be reinforced; setting an isolator outside the underwater structure to be reinforced, and making the height of the isolator be more than or equal to the height of the fiber reinforced composite material lattice ribs coated on the surface of the underwater structure to be reinforced; sealing concrete at the bottom of the isolator; and filling underwater epoxy resin or underwater non-dispersed mortar or underwater non-dispersed concrete into the clearance between the isolator and the structure to be reinforced. The process is simple; because the treatment of abandoning and preventing water is not needed during construction, and the periphery of the underwater structure to be reinforced does not need to arrange a cofferdam, the construction process has little influence on a navigation channel; and the reinforcing cost is low, the reinforcing is quick, the construction period is short, and the durability of the structure can be effectively improved.

The invention relates to an anti-shearing reinforcement device and method for a concrete box girder web. In order to solve the problem that in existing engineering technologies, the concrete box girder web has cracking inclined cracks and insufficient anti-shearing bearing capacity, an external vertical prestressing tendon reinforcement device and method are provided. The device comprises groove-shaped steel, L-shaped steel, vertical prestressing tendons, wedge-shaped steel cushion blocks and an anti-corrosion coating at the outer side of the web. The groove-shaped steel is horizontally fixedto the junction of the upper end of the web and a top plate in the girder length direction. The L-shaped steel (6) is horizontally fixed to the lower end of the web in the girder length direction andis parallel to the groove-shaped steel (5). The vertical prestressing tendons are vertically mounted on the groove-shaped steel and the L-shaped steel, and it is ensured that the vertical prestressingtendons are parallel to the plane of the web. According to the anti-shearing reinforcement device and method, the web is connected with the top plate and a bottom plate through finish rolling twistedsteel, the force transmission path is definite, the risk that web concrete is pulled broken is reduced, and meanwhile, midspan deformation is reduced; the problem of insufficient main tensile stressof the web concrete is effectively solved, and the situations of continuous extension of the inclined cracks of the web or new inclined cracks are prevented.

The invention provides an integrated laser additive manufacturing method for selective strengthening of titanium or titanium alloys, which can realize simultaneous completion of selective nitriding and workpiece forming in the process of additive manufacturing, without changing the original additive manufacturing process parameters. , to obtain a titanium nitride gradient strengthening layer combined with the substrate and dense without crack defects. The method is as follows: in an inert atmosphere processing chamber, the laser additive manufacturing of titanium or titanium alloy parts is carried out by layer-by-layer deposition; when it is deposited in a non-strengthening area, an inert gas is used as a powder-carrying gas and a laser lens protection gas ; When deposited in the strengthened area, without changing the process parameters, by using inert gas containing 30% to 100% nitrogen as the carrier gas and laser lens protection gas, the gas atmosphere at the molten pool is changed, so that The gas atmosphere at the melting pool contains 30% to 100% nitrogen, so that the titanium nitride strengthening layer is obtained after the strengthening area is deposited.

The invention discloses a reinforcement method of a reinforced concrete beam column node. A steel strand is transversely wound on the core area of the reinforced concrete beam column node, a device for prestressing applies prestree to the steel strand, and a buckle is adopted to carry out butt joint anchoring treatment on two ends of the steel strand when the prestress of the steel strand reachesa preset level. By adopting the above scheme, the method has the advantages: (1) a closed prestress steel strand is adopted to form effective horizontal restrain to the concrete in core area so that the steel strand and the node area co-work to greatly improve the shear resisting bearing capability of the node core area and improve the earthquake resistant capability of the node; (2) the reinforced concrete beam column node has strong applicability and wide application aspect and is suitable for reinforcing namespace nodes; and (3) the reinforced concrete beam column node has favourable economical efficiency and convenient and quick construction.

The invention relates to a construction method, in particular to a construction method for fast concreting and dredging and filling ultra-fine grained soil foundation. The method comprises the following steps of: arranging a well-point pipe on the surface of a consolidated foundation area and starting a vacuum pump for forced water discharging; arranging calcium oxide on the surface of the consolidated foundation area, mixing with an excavator, fully blending within a treatment deep range, leveling the surface with a bulldozer after the completion of the mixing, stewing materials for 24 hoursuntil the calcium oxide is fully decomposed, utilizing the physical and chemical reactions between the calcium oxide and a soil body to increase the weight of the soil body and generate self-weight concreting; starting an impact rolling and vibration rolling equipment to generate displacement, distortion and shearing to the soil grains, thus compacting the deep layer of the soil body together withthe transmission of a shock wave and quickening the sedimentation and consolidation of the soil body within the treatment range. The foundation carrying capacity can reach 80 to 120 kPa after being treated, thus solving the problem that personnel and equipment are operating at the site in a short time, and the technique is mature, and the construction efficiency is high.

The invention relates to a foundation treatment method for shallow layer vibratory compaction and deep layer explosive compaction combined with high vacuum well point dewatering, which is characterized in that it adopts underground deep layer explosive compaction and ground mechanical vibration or dynamic compaction for shallow layer compaction and high A combination of vacuum well point dewatering is used to treat large-area soft soil foundations. The advantages and effects of the present invention are: through the organic optimization combination of three technologies, the combination of mechanical rolling vibration or dynamic compaction and deep drilling explosion strong drainage and vacuum well point strong precipitation effectively strengthens large-area shallow and deep layers For soft soil foundation, the treatment depth can reach more than 18 meters, especially suitable for foundation reinforcement of dredger fill, silt foundation, soft clay and silt or silt interlayer foundation. The method has the advantages of fast construction speed, low reinforcement cost, simple and convenient operation, high construction efficiency and good foundation reinforcement effect.