129results about How to "Reduce engineering risk" patented technology

The invention discloses a method for reinforcing concrete structure by using prestressed fiber cloth. The fiber cloth anchorage and tension stressed region adopts a wedge structure which is opposite to the prestressing direction; the tensioning equipment using a simple structure with tension counterforce beams and tension rods has the advantages of simple structure, light weight and simple operation; and the anchorage and tension stressed region in the wedge structure enables the fiber cloth to be stressed uniformly in the process of tensioning and anchorage, and the fiber cloth can not be damaged when large tensioning force is applied, so that the fiber cloth reaches large longitudinal tensioning force without prestressing loss, thereby inhibiting the production and development of longitudinal cracks in concrete posts. The tensioning operation of the invention can do little damage to the original concrete structure, and thus, the invention can greatly save the construction cost, reduce the engineering risk and shorten the construction period, and has obvious technical and economic comprehensive benefits.

The invention relates to track traffic and tunnel categories, in specific to an arrangement structure of superdeep foundation pits in high pressure water areas; the structure adopts underground continuous walls (or drilling piles, drill biting piles and corresponding waterproof curtains) as enclosure structure, and inner supports (steel supports or concrete supports ) as support structures; during the course of foundation pit excavation, perform reverse execution on surrounding purlins, supports and side walls; through placing precast concrete beams or steel beams in seal concrete, the invention solves shortcomings in prior arts; the invention mainly has the following advantages: On one hand, the invention can avoid the diffuculty in penetration in execution of enclosure structure (in particular to waterproof curtains) when confined aquifers are rather thick and deep; on the other hand, the invention can also avoid all kinds of difficulties in pressure drop of pressure water. Therefore, the invention can save construction cost and lower construction risk at the same time of well protecting surrounding environments.

The invention aims at providing a satellite-borne electronic equipment backboard which has expansibility, a double-redundancy support backboard class and high reliability. The satellite-borne electronic equipment backboard is realized through the following technical scheme: on a high-speed backboard, two data management modules are respectively arrayed at two sides of two data exchange modules in parallel by taking the two data exchange modules as centers, and at least three data and signal processing modules which extend to two ends are arrayed at two sides of the two data exchange module in parallel; in the length direction of an extension backboard, data signal processing modules corresponding to above modules in the aspect of quantity are arrayed in parallel; the data and signal processing modules and the data management modules are interconnected to carry out communication between the high-speed backboard and the extension backboard through data provided by the data exchange modules, and the data management module acquires and monitors the health information and state information of each module so as to uniformly control the operation state and parameters of each module.

The present invention belongs to the field of ship making technology, and is especially multiple-tower combining process for installing a gantry crane. The installation process includes the following steps: set several portal tower pairs beside the gantry crane and setting elevating oil cylinders in the tops of the portal tower pairs to form elevating points; setting long distance sensor and oil pressure sensor to each point, connecting the oil pressure sensors to the main control cabinet and the elevating oil cylinders to the pump station with proportional valve connected to the main control cabinet; setting some elevating point as the master control one and the others as the servo ones and setting oil cylinder position sensor and proportional valve in the master control point; and controlling the synchronous operations of all the elevating points with the main control cabinet until completing the installation process. The present invention has high safety and reliability.

The invention discloses a minimum over-burden originating method for a shield tunnel. The method comprises the following steps of: reinforcing a shield originating section soil body with a method for combining earth covering back pressure, local full-section stratum reinforcing and gantry type stratum reinforcing to improve the stratum stability and the muddy water cleavage resistance of a top soil body; and reinforcing a stratum of a certain thickness on an opening with a freezing method to prevent slurry leakage, stratum instability, emergence of water and mud and the like in a muddy water cabin caused by soil body damage on a face, stratum looseness and the like after opening of a hole door during shield originating. Due to the adoption of the method, the problem of stability of an originating stratum under a minimum over-burden condition is solved, the construction risks of an originating working well and a deep foundation pit at an open excavation section are lowered simultaneously, and construction cost is lowered; and the method has good social and economic benefits.

The invention relates to a seawall construction method with top pipes penetrating through block stone, which comprises the following steps: 1, treatment of a block stone seawall: reinforcing the seawall section and grouting the seawall; and 2, penetration of the top pipes through a large embankment: setting the air pressure of an excavated compartment, removing large stone blocks, and constructing under the full air pressure to avoid collapse. By adopting the construction method, the top pipes can smooth penetrate through the block grouted embankment, the structure of the filling stones is loosen, and pores and clearances are filled with coarse sand and gravels. Meanwhile, when the top pipes are pushed into the area, the technical problems that the filled block stone layer cannot be balanced or compacted as a result of the air pressure, the upper block stones collapse when being removed, the collapsed funnel is formed, the seawall safety is threatened, and the seawall may be rejected can be solved, and engineering risks can be reduced.

The invention discloses an underground structure of a municipal pipeline group spanning tunnel and a construction method for the underground structure. The construction method is characterized in that the municipal pipeline group underground structure is excavated by adopting a construction method of strip-divided and block-divided pouring in a spacing manner, and a pipe section, which is assembled by a U-shaped slot prefabricated by reinforced concrete or a bottom plate and a cover plate, of a box-type structure is quickly hoisted, and bagged sand is piled up on the pipe section structure to compensate unloading caused by earth excavation, so that zero unloading during a pipeline mounting group construction period is realized, and heave deformation of an inferior subway tunnel is controlled. The specific construction of the construction method comprises the steps such as bracing of a foundation pit, earth excavation, pipeline mounting and the like. Compared with the prior art, the construction method controls the heave deformation of the pit bottom and the subway tunnel, has small influence on a surrounding environment, has high working efficiency and has low engineering risk, and is especially suitable for a soft soil area, so that environmental adverse effect caused by excavation of the foundation pit is reduced to be lowest, and the tunnel heave deformation caused by soil unloading is effectively controlled.

The invention provides a symmetric turnout for line rails No.4 and No.5 in urban rail traffic engineering. The turnout is arranged on a parking line rail of an underground line in an urban rail engineering, the structure of the symmetric turnout comprises a group of railroad switches, a group of frogs and a connecting steel rail, wherein the railroad switches are connected with the frogs by virtue of the connecting steel rail so as to form a symmetric turnout provided with two side rails. The symmetric turnout provided by the invention has the beneficial effects that the turnout ensures a subway and a light rail vehicle to travel safely between a main line and a parking line, related technical standards and safety requirements of the urban rail engineering are met, and the advantages of safety, reliability and convenience in manufacturing, paving, construction and maintenance are realized. By applying the symmetric turnout provided by the invention, turnout investment can be saved, and length of an auxiliary line can be obviously shortened, thus investment of a building project is greatly saved, construction difficulty is reduced, and project risk is reduced.

The invention discloses an arch seat anti-sliding stability safety calculation method for an arch dam, relates to the technical field of arch dam projects and solves the problems that a shear friction formula or pure friction formula is selected to perform arch seat stability analysis according to the level of an arch dam building, stress and damage characteristics of a sliding surface are not considered, and project risk or project diseconomy is caused by safety calculation result distortion in an existing method. The method includes the steps: firstly, determining a sliding mode of a slider as a double sliding mode or single sliding mode; secondly, determining the damage type of each loaded sliding resistance surface as anti-shearing-off damage or anti-shearing damage; thirdly, performing combination to obtain five damage types of the slider and calculating anti-sliding stability of the slider by selecting different formulas; finally, judging whether the slider is stable or not according to safety margin coefficient and evaluating arch seat anti-sliding stability safety. The method follows the basic principle of rock mechanics, deformation damage characteristics of the stressed slider are more really and accurately reflected, and accuracy of calculation results is higher.

The invention discloses a concrete conveying device, and the concrete is formed by mixing semi-finished concrete and additive. The concrete conveying device comprises a conveying pipeline (1) and a uniform mixer (2), wherein, the conveying pipeline (1) is used for conveying the semi-finished concrete; and the uniform mixer (2) is fixedly connected with the tailing end of the conveying pipeline (1) and is used for evenly mixing the semi-finished concrete and the additive; the uniform mixer (2) is provided with at least three interfaces, wherein, the first interface (2-1) is connected with the outlet of the conveying pipeline (1); the second interface (2-2) is connected with the outlet of an additive pumping mechanism; and the third interface (2-3) is used for outputting the concrete, and is close to the conveying destination of the concrete. The concrete conveying device can realize remote reliable conveying of the concrete, and obviously reduces possibility of jam of the conveying pipeline.

The invention provides a soil body electrical parameter space-time distribution testing device and testing method for a triaxial experiment. The testing device comprises a triaxial compression experiment device, an insulating rubber film, conducting strips and an electrodes. The insulating rubber film, the conducting strips and the electrodes are added into a confining pressure chamber in the triaxial compression experiment device; the insulating rubber film is used as a soil sample to be isolated from the confining pressure chamber in the triaxial compression experiment device; the conductingstrips and the electrodes are used for testing electrical parameters of the soil body; the conducting strips are arranged at the end parts of the two ends of a soil sample of the triaxial compressionexperiment; the electrodes are inserted into the soil body through the small holes of the insulating rubber film and are uniformly arranged along the circumferential direction of the insulating rubber film to form a group of conductive electrodes; and a plurality of groups of electrodes are arranged along the axial direction of the insulating rubber film to test the resistivity of each layer of soil body. The soil body electrical parameter space-time distribution testing device and testing method are applied to subgrade engineering of different soil bodies, soft soil and silt foundation engineering, various soil body landslides and other engineering, the soil body performance and damage state are evaluated, and the relation between damage and strength is established.

The invention discloses a large-scale overhead equipment foundation, wherein, a reinforced concrete frame is built on an underground bearing layer (6); an overhead region (5) is arranged in the middle of the reinforced concrete frame which comprises elements such as a reinforced concrete plate (1), a frame beam (2), an underground frame column (3), an intermediate beam (4) and so on; and the frame beam (2), the intermediate beam (4) and the reinforced concrete plate (1) are supported by the underground frame column (3). As for a foundation of oversized equipment, a reinforced concrete foundation footing (7) is built on the lower part of the underground frame column (3). The large-scale overhead equipment foundation can greatly reduce the concrete amount of large-scale equipment, reduce the earthwork excavated volume of a foundation pit, simultaneously reduce the hydration heat generated under the condition of bulk concrete placement, and avoid generation of concrete cracks, consequently reducing the engineering risk and the construction difficulty and reducing the incidence rate of engineering qualitative accidents.

The invention discloses a strong-water-permeability stratum building foundation pit horizontal grouting sealing bottom construction method. The strong-water-permeability stratum building foundation pit horizontal grouting sealing bottom construction method includes the following steps that horizontal grouting sealing bottom construction is conducted, wherein precise positioning and horizontal grouting hole drilling are conducted through a horizontal directional drilling machine, and after hole drilling is completed, retreating type grouting is conducted when drill stems are dragged back, and ahorizontal sealing bottom is formed at the bottom of a foundation pit; and vertical curtain construction is conducted, wherein after sealing bottom horizontal grouting is completed, closed vertical curtains are formed on the four sides or the three sides of the foundation pit, complete lap joint connection is conducted on the vertical curtains and the horizontal sealing bottom, and in other words, a strong-water-permeability stratum foundation pit water insulation structure is formed. According to the strong-water-permeability stratum building foundation pit horizontal grouting sealing bottomconstruction method, vertical curtain construction is conducted after horizontal sealing bottom construction is conducted; firstly, the horizontal sealing bottom can be rapidly formed for the foundation pit to control underground water; then, the vertical curtains and the horizontal sealing bottom structure are connected together, and therefore a three-dimensional anti-seepage structure can be formed for the foundation pit project, and the effects of supporting, water insulation and foundation pit project reinforcing are achieved; and while the surrounding environment is well protected, the project cost is saved, and the project risk is lowered.

The invention provides an underground station structure with a stop line in an urban rail transit project. The structure is arranged on an underground station with a stop line in an urban rail transit project. The structure comprises two groups of symmetrical three-way turnouts, connection rails, two groups of buffer stops, four groups of single-way turnouts and platforms. The two groups of symmetrical three-way turnouts are connected with the two groups of buffer stops through the connection rails, to form a symmetric three-way turnout through stop line, and then connected with the four groups of single-way turnouts paved on right and left main tracks through the connection rails, to form the underground station structure with the stop line together with the platforms. The underground station structure has the effects that the total length of the underground station can be shortened by 50-60 meters approximately, the station which is excavated is partially changed into a running tunnel of which the construction adopts a shield method, thus the demolition of structures, changing of municipal pipelines and scale of traffic reconciliation caused by the project are reduced, the project investment is lowered, the construction difficulty and risk are lowered, and the influence on the urban environment due to implementation of the project is decreased.

The invention discloses a construction technology of an extra-large steel structure canopy under severe conditions. The construction technology of the extra-large steel structure canopy under severe conditions comprises the steps that for graphic design drawings of the extra-large steel structure canopy, the TEKLA software is adopted to check and correct the graphic design drawings of the extra-large steel structure canopy based on a three-dimensional technology, so that all structural components can be accurately staked out; for the assembly and manufacture of large components in the extra-large steel structure canopy, location of an explorator is realized by means of surface positioning or hole positioning; for the installation of extra large section steel columns in the extra-large steel structure canopy, effective anti-rolling reinforcement is carried out, and a foundation anchor is inbuilt by a positioning bracket technology. An all-weather steel structure canopy construction scheme enables steel structural components to be accurate in size and hole positions are matched, thereby effectively avoiding the repair work of the components caused by the design and manufacturing quality problems; at the same time, the entire construction scheme has high safety and security, effectively reduces engineering risks, and can effectively ensure the progress, quality and safety of a construction project.