50results about How to "Increase bending moment" patented technology

The invention discloses an auxiliary slinging device and method through combination process of a plurality of cranes. The auxiliary slinging device comprises an auxiliary winch, an elastic auxiliary suspension arm, an auxiliary suspension rope, a turnable auxiliary rotation support, a connecting base and a connecting device for the cranes, wherein the connecting base is connected with main suspension arms of the cranes; the auxiliary rotation support is connected with the connecting base, and the arm tail of the auxiliary suspension arm is hinged to the auxiliary rotation support; the auxiliary wince is arranged on a rotary table of each crane, the auxiliary suspension rope winds the auxiliary winch , and the auxiliary suspension rope winds around the arm head of the auxiliary suspension arm; the main suspension ropes of the cranes wind around the arm head of the main suspension arm to be connected with the auxiliary suspension arm; the connecting device for the cranes is connected with the connecting base, and the auxiliary hoisting method adopts the auxiliary slinging device to sling heavies. The auxiliary slinging device and method, disclosed by the invention, can realize hoist in a large working space for the cranes under the condition of not enlarging the length of an elevating arm, so that the destabilizing resistance and the hoisting stability of the cranes are improved, and the hoisting efficiency is improved.

The invention discloses a cable-girder combined type bridge and a construction method thereof. The cable-girder combined type bridge comprises a plurality of bridge sections, each bridge section comprises a girder body structure, a pavement layer and a cable structure, the girder body structure comprises a plurality of columns of longitudinal beams, and the cable structure comprises a cable and stay bars. The construction method is characterized in that the bridge is constructed in bridge sections from front to the back along the longitudinal direction of the bridge, construction methods on the bridge sections are the same, and the construction process of each bridge section includes the steps of 1), construction of the first bridge section includes: 101, construction of the girder body structure, 102, mounting of the cable structure, and 103, pavement of the bridge floor; 2), construction of the next bridge section; 3), multiple repeat of the step 2) till all the construction process of the constructed bridge is completed. All the girder structure is under pressure, the cable is under tension, the cross section and self weight of the girder body structure are reduced, bending moment of the girder body structure is reduced, and spanning capability is increased.

The discrete profile mold unit for heat plate formation includes upper mold, which has several closely arranged ram heads comprising screw connected to the template and matched head capable of shifting along the screw; lower mold, which has also several closely arranged ram heads comprising screw connected to the template and matched head capable of shifting along the screw. The ram heads in the upper mold and those in the lower mold are corresponding to each other and may be in the same or different axle. The present invention has the features of simple structure, low cost, convenient operation and maintenance, and adjustable ram head height.

The invention relates to the field of assembling an integrated building structure, in particular to a reserve rib laminated floor slab and a construction method thereof. The reserve rib laminated floor slab comprises a plurality of prefabricated reserve rib plates assembled together; a sunken groove is formed in the upper surface of each prefabricated reserve rib plate; and a later pouring concrete layer is arranged above the plurality of spliced prefabricated reserve rib plates. The construction method of the reserve rib laminated floor slab comprises the following steps of S1, making the prefabricated reserve rib plates; S2, mounting supports on a main beam and a sub beam; S3, hoisting the plurality of prefabricated reserve rib plates with the groove surfaces upwards, horizontally layingthe plurality of prefabricated reserve rib plates on the main beam or the sub beam in sequence, and splicing the plurality of prefabricated reserve rib plates to form a floor slab; and S4, pouring aconcrete layer to form the laminated floor slab. According to the reserve rib laminated floor slab and the construction method thereof, through adoption of the structure, the reserve rib laminated floor slab can be used as a cast-in-place concrete template so that the template usage and the support usage can be reduced, the construction efficiency can be effectively enhanced, and the cost can be saved. The reserve rib laminated floor slab has the advantages of smoother lower surface of the floor slab and more beautiful building effect.

The invention relates to a large-scale wading ring-shaped rigid foundation and a construction method thereof. An inner well wall is arranged in the position, 20-25 m away from an outer well wall, of the interior of the outer well wall. A sealed ring-shaped body is formed by placing a ring-shaped cover plate on the upper portion of the inner well wall and the upper portion of the outer well wall and pouring ring-shaped bottoming concrete to the lower portion of the inner well wall and the lower portion of the outer well wall. Partition walls are arranged between the inner well wall and the outer well wall. The construction method comprises the steps that 1, after being manufactured in the land or a dock, foundation base section steel shells of steel shell concrete enter the water and are floatingly transported to a scene to be positioned precisely, watering and sinking are conducted, and after a bed is stable, the steel shell concrete is poured; 2, the well walls and the partition walls are heightened through reinforced concrete and sunken through soil sampling, when soil is sunken to a design elevation, bottom clearing is conducted, and the bottoming concrete is poured; and 3, top cover plate concrete is poured, and an overall ring-shaped forced structure is formed. According to the large-scale wading ring-shaped rigid foundation and the construction method thereof, the foundation is designed to be a ring-shaped deeply-buried-type rigid foundation in accordance with a high-rise structure with the characteristics of being large in electric tower foundation horizontal force, bending moment and foundation top surface construction size, and a part with the small stress in the middle is hollowed out skillfully; compared with an ordinary sunk well foundation, a large number of materials are saved, and the integrity, the loaded property and the economy are good.

The invention provides a reversing formwork for manufacturing a cast-in-situ prestressed concrete cylindrical fan foundation. The reversing formwork assembled in whole is placed into a dug foundation pit in a lifting manner. Turn buckles are contracted after plain concrete is poured in a space between the cylinder wall of the reversing formwork and the wall of the foundation pit, connecting bolts between specially-shaped piles of the reversing formwork and the cylinder wall of the reversing formwork move along elliptical holes, so as to enable the reversing formwork to be contracted, the demoulding of plain concrete is realized, and a cylindrical bearing ring inner wall and an inner die cylinder wall are formed after demoulding and used as an outer die and an inner die of a concreting cylinder body. An inner formwork matched with the reversing formwork consists of an inner formwork cylinder wall, inner support rods, inner formwork horizontal support rods, top fixing beams, inner formwork specially-shaped piles, turn buckles, foundation leveling bolts, inner truss uprights, inner truss oblique rods, inner truss cross rods, inner main uprights, lifting hooks, inner formwork specially-shaped pile elliptical holes and inner formwork connecting bolts, the formwork erecting and demoulding technology is identical to that of the reversing formwork, the pit is refilled with soil after the concrete cylinder is cured by filling the pit with steam, and a post-cast concrete slab is poured at the upper part.

A connecting structure of beam column nodes and a construction method thereof, wherein the connecting structure comprises a square steel tube concrete column, an I-shaped steel beam, T-type splitting plates and a long screw bolt, wherein two ends of the long screw bolt are respectively fixedly connected with the I-shaped steel beam and the square steel pipe concrete column, four T-shaped splitting plates are respectively and symmetrically arranged between the square steel tube concrete column and the I-shaped steel beam, and is fixedly connected with the square steel tube concrete column and the I-shaped steel beam. Compared with a traditional node, the integral intensity of the node is high, the construction is convenient, materials are saved, the I-shaped steel beam flanges of the structure are connected through the T-shaped steel, the integral bearing performance of the node is increased, the rigidity of the nodes is bigger, and the aseismic performance is good.

The invention relates to a novel overhanging I-steel pre-embedded anchor device and anchor method, and belongs to the field of constructional engineering. The novel overhanging I-steel pre-embedded anchor device comprises two steel plates which are vertically arranged at intervals, an upper steel plate and two stop blocks, wherein the lower ends of the two steel plates extend into pre-embedded pits of a concrete floor; the upper steel plate is arranged between the two steel plates, and is arranged on the upper parts of the two steel plates; the two steel plates, the upper steel plate and the concrete floor are enclosed into an accommodating cavity, I-steel penetrates through the accommodating cavity, and the upper end surface of the I-steel abuts against the lower end surface of the uppersteel plate; the two stop blocks are correspondingly fixed to the two steel plates, the two stop blocks extend to the accommodating cavity between the I-steel and the two steel plates, and the two stop blocks correspondingly abut against webs of the I-steel. Through the two steel plates, the contact area with the I-steel at the left and right ends can be increased, and the torsion of the I-steel in a horizontal plane can be limited; the stop blocks are further arranged between the I-steel and the steel plates, so as to further increase the attachment area of the I-steel at the left and right sides, the bending moment of the required torsion of the I-steel in the horizontal plane is increased, and the anti-torsion ability is improved.

Sterile connector for tubing comprising a section of tubing (2) with an end portion (3) to be connected to a further end portion of a further section of tubing and / or another counterpart in order to establish fluid communication,- at least one axial protrusion (4) extending away from the end portion (3) of the section of tubing in an axial direction of the section of tubing, and- a separation layer (5) which closes off an inside (6) of the section of tubing (2),wherein the separation layer (5) comprises a predetermined breaking site (7) and that the at least one axial protrusion (4)- is connected pivotally to the end portion (3) of the section of tubing (2) to pivot from a first position to a second position when engaged with a further axial protrusion on the further end portion of the further section of tubing and / or with the other counterpart and- is coupled to the separation layer (5) so as to exert a breaking force on the separation layer (5) in the second position which breaking force is big enough to break the separation layer (5) at the predetermined breaking site (7).

The invention discloses a portable overlapping fixing bracket for a jack bracket. The fixing bracket is characterized by comprising a bracket body consisting of a central vertical pipe, at least three Y-type pipes symmetrically fixed at the bottom end of the central vertical pipe and a limiting plate at the top end of the central vertical pipe, wherein scaffold rotating buckles are arranged on the Y-type pipes of the bracket body respectively and used for inserting and fixing support rods conveniently; and the limiting plate is provided with support rod limiting notches of which the number corresponds to that of the Y-type pipes. The scaffold rotating buckles on each Y-type pipe can conveniently adjust the extension length of each support rod according to the topographical condition and can rapidly fix the support rod with the fixing bracket in a drawing mode, so that the central vertical pipe of the fixing bracket is kept in a vertical state, the stable hoisting and safe operation ofa jack hung on the bracket can be ensured. The fixing bracket can be stably erected on the ground within 3 minutes. The portable overlapping fixing bracket for the jack bracket has a simple structureand small size, is convenient to carry and very suitable for performing emergency rescue on an external field with complex topographical condition and enhances the timeliness of emergency rescue.

The invention discloses a method for adjusting the weight of fillers on a masonry arch bridge in a partitioning manner. The masonry arch bridge comprises a main arch ring (1), spandrel arch rings (2), a filler layer (3) on arches, and a bridge panel (4). The method comprises the steps: the filler layer (3) on the arches is divided into an arch top area (31) and spandrel arch areas (32), wherein the arch top area (31) is formed between the main arch ring (1) and the bridge panel (4), and the spandrel arch areas (32) are formed between the spandrel arch rings (2) and the bridge panel (4); lightweight concrete fillers with the apparent density from 800kg / m3 to 1200 kg / m3 are filled into the arch top area (31), and lightweight concrete fillers or ordinary soil quality fillers with the apparent density from 1200kg / m3 to 1950 kg / m3 are filled into the spandrel arch areas (32); and the weight of the filler layer (3) on the arches is adjusted by calculating three objective functions, i.e. bending moments Md, M1 / 4 and Mj generated by the main arch ring on the arch top, the one quarter of an arch span, and arch feet, and the like. The method has the advantages that the utilization efficiency of arch ring materials can be improved, the distribution of the internal force of the main arch ring is improved, and the carrying capacity of the arch bridge is improved.

The invention discloses a high-sensitivity vibration sensor, and the sensor comprises a substrate with a cavity and a plurality of piezoelectric cantilever beams; a fixed column is arranged in the center of the bottom surface of the cavity, and a signal receiving area is defined by the plurality of cantilever beams and is fixed above the substrate through the fixed column; each piezoelectric cantilever beam comprises a fixed end and a free end, wherein the width of the free end is greater than that of the fixed end, the fixed end is fixed to the fixed column, the free end is suspended above the cavity, and a gap is formed between every two adjacent piezoelectric cantilever beams. The sensor further comprises a sealing cap with a groove, and the groove edge of the sealing cap is connected with the free end of each piezoelectric cantilever beam. The section of the groove can be in any shape, and a trapezoid with the included angle between the bottom face and the side wall greater than 90degrees is preferably selected. According to the invention, a load generated by a vibration signal is concentrated at the free ends of the piezoelectric cantilever beams through the sealing cap, so the bending moment borne by the piezoelectric cantilever beams is larger, the deflection degree of the piezoelectric cantilever beams is larger, a larger transverse load can be generated when the included angle is greater than 90 degrees, and the sensitivity of the vibration sensor is effectively improved.

The invention provides a reinforcing steel bar distribution structure shaped like a Chinese character mi for a floorslab. The reinforcing steel bar distribution structure shaped like a Chinese character mi mainly is mainly used on a rectangular floor slab with girders at the periphery, and mainly comprises a lower-layer reinforcing mesh, an upper-layer reinforcing mesh and a top and bottom opposite angle connecting bracket. The periphery of the lower-layer reinforcing mesh penetrates through a reinforcing steel bar body of the girder, and the lower-layer reinforcing mesh comprises a cross-shaped reinforcing mesh and a slab corner reinforcing mesh. The upper-layer reinforcing mesh is distributed above the lower-layer reinforcing mesh, and the periphery of the upper-layer reinforcing mesh is connected with the upper side part of the reinforcing steel bar body. The upper-layer reinforcing mesh comprises a middle reinforcing mesh and a girder corner reinforcing mesh. Through the mode of distributing the reinforcing steel bars in a shape like a Chinese character mi at the upper and lower layers, the performance of the various reinforcing meshes are given full play, and the materials are also saved. The reinforcing steel bar distribution structure can be prefabricated in a factory and is then constructed on the site, the site operation is convenient, and the construction efficiency and the construction quality are improved. The top and bottom opposite angle connecting bracket leads to integral connection of the upper-layer reinforcing mesh and the lower-layer reinforcing mesh, so that cracks on four corners of the floorslab are eliminated, and the bearing capacity of the floorslab and the rigidity of a floor system structure are also improved.