42results about How to "Reduce horizontal thrust" patented technology

The invention provides concrete integral pouring construction method and device for a road inspection well. The method comprises advance constructions and post constructions, wherein the advance constructions comprise the following steps of: measuring and paying off; excavating a wellhole; pouring a reinforced concrete foundation bottom and building a wellhole protection wall; connecting pipelines; building a well chamber; mounting a tread; backfilling well perimeters; reserving a branch pipe; building a close up section; mounting a cover plate; building the wellhole; covering and protecting; backfilling cement and stone dust to the well perimeters; and constructing a pavement basic layer. The post constructions comprise the following steps of: excavating the pavement basic layer covered on the wellhole to expose the wellhole, dismantling the cover plate and excavating a concrete foundation pit by using the wellhole as a center, wherein the radius of the excavated foundation pit two times larger than or equal to that of the wellhole; laying reinforcing steel bars in the foundation pit and supporting an inner mold in the wellhole; overhanging a well cover on the wellhole by a fixing bracket overhanging device; adjusting the altitude of the well cover; pouring concrete into the foundation pit and keeping the height of the concrete parallel to the bottom of the well cover; building the perimeters of the well cover into a cement slope by concrete; carrying out acceptance checks; paving a bituminous pavement on the perimeters of the well cover and keeping the bituminous pavement parallel to the well cover.

The invention relates to a circular awning with a cable dome and a spatial steel truss being combined and a construction method of the circular awning. The circular awning comprises an awning roof and a main body; the circular awning is an approximately spherical segment surface; the awning roof is of a cable dome structure; the main body is of a spatial steel truss structure; the bottom end of the cable dome is fixedly connected with the top end of the spatial steel truss structure. The spatial steel truss structure comprises at least one layer of weft curved beam which is a polygonal spatial steel truss. The spatial steel truss structure comprises at least two layers of weft curved beams and radial curved pillars; the radial curved pillars are connected with each layer of weft curved beams, and every two adjacent radial curved pillars are connected through weft pull rods which are arranged at intervals according to fixed latitudes. The circular awning disclosed by the invention combines tensile and rigid structures, integrates inward tension of the tensile structure and outward thrust of the spatial steel truss structure, and realizes self-balance of inside and outside stresses; the stress of an arched steel structure is reduced, the integral structural stability is better, and meanwhile, the horizontal thrust of the lower part of the steel truss structure and a support is reduced, the maintenance cost of late-stage anticorrosion is reduced, and the construction efficiency is high.

The invention relates to the technical field of bridge engineering construction, in particular to an erecting, pushing and sliding method of a large-tonnage steel box beam. The method comprises the following steps of: firstly, arranging flat steel gasket boxes at the top of each bridge pier to obtain a plane, mounting a driving pusher or a driven pusher and hydraulic jacks for lifting and falling the beam on the plane and moving the steel box beam into the bridge pier; then, starting the driving pusher to drive the steel box beam bodies to slide forwards, simultaneously lifting the hydraulic jacks for lifting and falling the beam to jack the steel box beam after a piston travel is finished, returning the driving pusher to an initial position and falling the hydraulic jacks; and repeating the piston travel to move the steel box beam in place. The method of the invention can be used to safely, rapidly, accurately and continuously realize the longitudinal in place of steel box beams and has controllable pushing and longitudinally moving speed without arranging an upper slideway or a lower slideway so as to save a great amount of rail devices and labor without occupying riverway space.

The invention discloses a rolling friction walking jacking and pushing device for bridge segment installation. The rolling friction walking jacking and pushing device for the bridge segment installation comprises a groove type travelling track tray (1), a long ram jacking and pushing hydraulic jack (2), a rolling mobile platform car (3), a steel plate box (4),a steel tube cup type sliding shoe (5), a transversely rectifying hydraulic jack (6), and a lifting hydraulic jack (7), whereinthe groove type travelling track tray is combinedly welded by circumferential side plates and a bottom plate, the hydraulic jack is fixed to the end plate, in the direction orthogonal to that of the jacking and pushing, of the tray, the rolling mobile platform car is placed in the tray and connected with a pinof the jacking and pushing hydraulic jack, the steel plate box is placed and fixed on the rolling mobile platform car, the steel tube cup type sliding shoe is placed in the steel plate box and connected with a pin of the transversely rectifying hydraulic jack which is fixed to the side plate, in the direction orthogonal to that of the jacking and pushing, of the steel plate box, and the lifting hydraulic jack is placed in the steel tube cup type sliding shoe. According to the rolling friction walking jacking and pushing device for the bridge segment installation, horizontal thrust of a bridgepier or the top of a temporary buttress pier and local stress when lifting a beam body are substantially decreased during the jacking and pushing installation process of the bridge, smooth and rapidjacking and pushing can be achieved.

The invention discloses a connecting structure of a circular coal bunker coal retaining wall and a coal piling area raft foundation and a construction method of the connecting structure. A right-angle convex ring table is arranged at the outer ring of a ring-shaped coal retaining wall foundation; the coal piling area raft foundation comprises a raft area and an embedding connection part, wherein the embedding connection part of the coal piling area raft foundation extends to the ring-shaped coal retaining wall and is embedded in and connected with the ring-shaped coal retaining wall foundation; the lower side of the embedding connection part of the coal piling area raft foundation is provided with a concave ring groove; the size and the shape of the concave ring groove are matched with those of the right-angle convex ring table; the right-angle convex ring table and the concave ring groove are matched and connected with each other in an embedded manner; and therefore, a node-type shared ring-shaped coal retaining wall foundation horizontal thrust embedding connection structure can be formed. According to the connecting structure the coal piling area raft foundation and the ring-shaped coal retaining wall foundation are connected together in an embedded manner, and the horizontal thrust of the ring-shaped coal retaining wall foundation is effectively shared by foundation group piles of the coal piling area raft foundation, so that the integrity of the structure is improved, the number of the foundation piles of the ring-shaped coal retaining wall foundation can be reduced, and the construction cost is lowered.

The invention discloses a steel-wood mixed crossed string arch structure which comprises an upper string single-layer wood arch shell and a lower string inhaul cable assembly. The upper string single-layer wood arch shell is formed by intersecting two sets of wood arches which are obliquely arranged in parallel in a crossed manner, and the two ends of each wood arch are connected with frame beamsrespectively. The lower string inhaul cable assembly comprises a plurality of lower string inhaul cables and supporting rods, the lower string inhaul cables are arranged below the upper string single-layer wood arch shell, the two ends of each lower string inhaul cable are connected with the frame beams respectively, the lower string inhaul cables and cross arches of the upper string single-layerwood arch shell are arranged in a staggered manner, the supporting rods are arranged between the lower string inhaul cables and the corresponding wood arches and arranged at intervals along the lowerstring inhaul cables, and the lower string inhaul cables, the supporting rods and the corresponding wood arches are matched to form a space three-dimensional truss structure. According to the structure, the horizontal thrust at an arch shell support can be effectively reduced, so that the purpose of reducing the size of a lower supporting component is achieved, meanwhile, the stress level of the arches can be reduced through the arrangement of the inhaul cables, the stress of the upper string arch is more uniform, and the overall structural stability of the upper string arch is better.

The invention discloses a large-span combined arch bridge based on a bending pressure design theory and a design and construction method thereof. The arch bridge comprises an arch springing section capable of bearing the action of tension or pressure and an arch web-arch crown section of an open web structure. The arch axis part of the arch foot section is a convergent composite curve; the curvature is changed, the arch foot section is rigidly connected with the arch web-arch crown section; the structure is continued, the tangent slopes of connecting points between the two are consistent, thecurvature of the arch foot section is gradually increased to be close to 90 degrees, only vertical component force exists, the horizontal component force is close to 0, the horizontal thrust of the main arch is reduced by 30%-64%, and the transverse stability is improved by 35%-55%; and horizontal tie bars required for overcoming horizontal thrust are reduced or canceled, so that the manufacturingcost is saved, the mechanical advantage that the composite structure material can be pressed and can be tensile and the economic spanning capacity of the large-span arch bridge can be fully exerted,and the section efficiency is improved.

The invention relates to a rotary rice drying system. The rotary rice drying system is characterized in that a drying roller is horizontally arranged, a left feeding box is arranged on the left side of the drying roller, a hot air inlet pipe is arranged at the top end of the left feeding box, and a drying roller butt joint hole is formed in the right side surface of the left feeding box; a rice feeding pipe is further arranged in the left feeding box, the rice feeding pipe is vertically arranged on the left feeding box, and the lower end of the rice feeding pipe extends into the drying roller;and a cleaning bin door is arranged at the bottom of the left feeding box, a plurality of inclined stirring pieces are arranged on the inner wall of the drying roller, and a supporting frame is arranged at the bottom of the drying roller. The rotary rice drying system has the advantages of being reasonable in design and reliable in performance, so that the heat energy utilization rate is high, the drying is uniform, the material cleaning frequency is less, and the maintenance is convenient.

The invention discloses a structural design and construction method of a partially assembled subway station, comprising an open-cut foundation pit and its enclosure structure, a cast-in-place bottom plate and bottom beams, a cast-in-place side wall, a laminated middle plate, a prefabricated column, and a prefabricated beam , Prefabricated arched roof. The station floor and side walls are poured on site, and the outer side walls use the enclosure structure as a formwork to achieve an integrated design with the enclosure structure. The prefabricated columns and prefabricated beams of the station are connected through grouting sleeves, the middle plate is constructed using laminated plate technology, and the arched roof is prefabricated in the factory and transported to the site for assembly. The prestressed arched roof distributes the vertical load to the side walls and the enclosure structure, which reduces the axial compression ratio of the key components of the underground structure, the structural force is more reasonable, and the seismic performance is better; compared with the fully prefabricated station structure , the number of splicing seams of the prefabricated components of the present invention is small, which is beneficial to improving the waterproof effect of the subway station. The invention has simple structure and convenient installation, and conforms to the trend of building industrialization.