Contact screw butt joint of precast reinforced concrete columns
SUBSTANCE: contact screw butt joint of precast reinforced concrete columns includes end portions of joining columns and an embedded part placed in the lower end portion of the upper column, made in the form of an end plate with corner holes for anchor studs and equipped with angle elements to form niches, to which anchor bars are welded. In the upper end portion of the lower column there is another embedded part in the form of the end plate with the anchor studs for coupling and adjusting nuts, mounted coaxially with the holes in the end plate of the embedded part in the lower end portion of the upper column. A reinforced concrete key in the form of a truncated pyramid is located in the lower end portion of the upper column, and a groove for the reinforced concrete key is made in the upper end portion of the lower column, at that the central hole is made in the embedded part, the sizes of which correspond to the sizes of the larger base of the reinforced concrete key, and the central hole corresponding to the sizes of the open side of the groove is made in the other embedded part.
EFFECT: increase of the bearing capacity of the column and its butt joints.
The technical field to which the invention relates.
The invention relates to the field of construction and is designed for multi-storey and high-rise buildings in areas with seismic activity.
The level of technology
Known precast concrete column and joint connection of precast reinforced concrete columns (RF patent No. 51048, IPC E04B 1/38, publ. 27.01.2006), which contains longitudinal rod reinforcement, transverse reinforcement along the length of the column, indirect reinforcement at the ends of the column, and is provided on the ends of the sets of inserts. Column contains the ends aimed up and down (top and bottom), at least two sets of inserts, each of which is on the top of the column is made in the form of anchor studs with fasteners, and the bottom end of the column is in the form of a support flange with a bolt hole anchor stud and adventives niche, and the mounting flange is equipped with a profile established with the formation wall adventive niches and a Central, lateral and gravity anchor rods. Butt connection of columns includes the ends of joined columns and placed on the upper and lower ends of the columns, set out in the project position, the sets of inserts containing studs with fasteners and niches filled with concrete, cent is yuushuu gasket in the space between the ends, filled with niches and concrete.
A disadvantage of the known technical solution is the low reliability of the design of precast reinforced concrete columns, since the longitudinal reinforcement bars are made with the limb in the junction to tie rod stud and the section of the column at the location of the NIS weakened. In addition, it is necessary to select the thickness of the centering strip.
As a prototype adopted the design of concrete columns with anchor pin and butt connection of columns (RF patent No. 113752 IPC E04B 1/00 publ. 27.02.2012). Column contains the longitudinal rod reinforcement, transverse reinforcement, indirect valve installed in the lower and upper parts of the columns, anchor studs with fasteners located in the upper part of the column, mortgage detail button at the bottom of the column, made in the form of bottom end plate with corner holes for anchor stud and fitted corners, forming a niche, to which is welded to the rods. Indirect reinforcement in the lower and upper parts of the columns are executed in the form of a mesh, placed uniformly along the height of the joint. Butt connection of columns includes the ends of joined columns in the upper fragment of the column is the upper end plate with corner holes made with the Foundation with anchor studs, to the inner side surfaces of each corner welded angle connection plate of rectangular shape, and its outer lateral surfaces are welded interceptor rods in the lower fragment has a support plate with four holes completed to skip anchor studs.
The disadvantage of this technical solution is the low reliability of the design of the interface under the action of significant shear forces and bending moments and the lack of ability to control the actual site transfer of stresses from the top seam to the bottom associated with the complexity of the work when poured.
Disclosure of inventions
The main technical task, which directed the claimed design of a butt-joint, is the reliability of the junction of the columns under the action of shear forces and bending moments along with the longitudinal force.
The technical result achieved in the implementation of the proposed solution is to increase the carrying capacity of the column and her butt joints.
New in the present invention is that the lower end part of the upper reinforced concrete column is a key in the form of a truncated pyramid, and in the upper end area of the bottom of the column is made a groove for the concrete Spa the key, in fixtures made the Central hole whose dimensions match the dimensions of the larger base of the concrete dowels, and other fixtures made the Central hole corresponding to the size of the open side of the groove.
In the analysed literature not found this combination of distinctive features. This set of distinctive features is not obvious to a person skilled in the art, and this solution can be successfully used in industry.
Thus, the proposed solution meets the criteria of the invention: "Novelty", "Inventive step", "Industrial application".
Brief description of drawings
The invention is illustrated by drawings, where Fig.1 shows a General view of the connection node of the columns in height, Fig.2 is a longitudinal section of the joint of Fig.3 and Fig.4 is a General view of the embedded parts of the upper and lower columns, respectively.
Butt joint reinforced concrete columns through the key (Fig.1, figs.2) includes a lower end portion of the upper column 1 and the upper end area of the lower column 2, mortgage item 3 on the lower end part of the upper columns 1 and other mortgage item 4 on the upper end section of the lower column 2, reinforced concrete plug 5, four quotation is Aiki 6 and four nut 7. In the upper end area of the bottom of the column 2 has a groove 8 for concrete dowels 5. Concrete key 5, as well as the ends of columns 1 and 2, reinforced welded mesh indirect reinforcement 9. Embedded plate 3 (Fig.3) consists of a base plate 10, in which the four holes for the passage of the anchor rods 11 other fixtures 4 and one Central hole for concrete dowels 5. Backing plate 10 is welded to four area 12, which together with the plate 13 form a niche for accommodating a screw connection of the upper and lower columns 1 and 2. Anchoring fixtures 3 in the lower end part of the upper column 1 is carried out using eight rods 14 which are welded to the corners 11. Other embedded plate 4 (Fig.4) located in the upper end section of the lower column 2, consists of a base plate 15. In the base plate 15 is a Central hole for the device of the groove 8 for placing concrete dowels 5. Backing plate 15 is welded to the four anchor studs 11.
The implementation of the invention
The device joint when the installation of the columns 1 and 2 is carried out in several stages. In the groove 8 located on the upper end section of the lower column 2 fits fine-grained concrete mix, in parallel with quotation nuts 6 is selected planning who controls the elevation of the lower end portion of the top of the column 1. Then mounting the top of the column 1, the anchor studs 11 on the upper end section of the lower column 2 are passed into the holes fixtures 3 at the lower end part of the upper column 1, and reinforced the key 5 is in the groove 8, thereby ensuring the transmission of forces from the top of the column 1 to the lower column 2. The alignment of the top of the column 1 is also quoted by nuts 6 and nut 7 finally fix the column in the design position. The last stage is the monolithic joints and gaps between the upper end area of the lower column 2 and the lower end portion of the upper column 1 fine-grained concrete.
The proposed invention, due to the above characteristics, has the most perfect design, which ensures the reliability of structures under the action of not only the longitudinal force, but also a considerable transverse forces and bending moments.
Pin screw joint connection of precast concrete columns, comprising the ends of joined columns and placed in the lower end part of the upper columns of a mortgage item is made in the form of end plates with corner holes for anchor studs and feature areas for the formation of niches, to which is welded to anchor the rods, in the upper end section of the lower column is another embedded plate in the form of end plates with anchor studs under the clamping and adjusting screws mounted coaxially with the holes in the end plate of the mortgage loan parts in the bottom end part of the upper column, characterized in that the lower end part of the upper reinforced concrete column is a key in the form of a truncated pyramid, and in the upper end area of the bottom of the column is made a groove for concrete dowels, with fixtures made the Central hole whose dimensions match the dimensions of the larger base of the concrete dowels, and other fixtures made the Central hole, corresponding to the dimensions of the open side of the groove.
SUBSTANCE: flanged joint includes joined elements with bevelled ends and flanges welded to them with stops and openings for bolts. Each flange has a rectangular opening with rounded angles, besides, the longitudinal axis of the opening and the longitudinal axis of the stop are matched with the longitudinal axis of the flange, and one end of the stop and short side of the rectangular opening are matched with each other and the transverse axis of the flange. In the assembled form the stop enters the opening of the adjacent flange with gaps at three sides and tightly to the short side of the opening matched with the transverse axis of the flange. Flanges are connected to each other by tightening bolts arranged symmetrically relative to axes of the flange.
EFFECT: increased reliability of a flanged connection with simultaneous reduction of material consumption.
SUBSTANCE: method to connect belt rod elements of a truss structure, according to which belt rod elements are connected to appropriate connection rod elements and/or with appropriate belt rod elements of the truss section. Ends of all rod elements are made with self-stopping thread. In each pair of connected elements thread at their ends is made as differently directed, and their ends are placed in contact to each other due to turning of tightening connection couplings onto ends of elements.
EFFECT: increased reliability of connection, simplified assembly of a structure.
2 cl, 2 dwg
SUBSTANCE: nodal connection includes connection angles rigidly fixed to vertical walls of rods with end plugs and shelves joined on bolts. Same connection angles with shelves joined by bolts are rigidly fixed on horizontal walls (shelves) of rods. At the same time vertical and horizontal walls of connected rod elements in the range of their attachment to leaves of connection angles are reinforced from inside with membranes arranged in parallel to end plugs.
EFFECT: increased bearing capacity of nodal connection.
SUBSTANCE: connection method involves overlapping of ends of thin-walled elements with walls on a sheet gusset plate, installation of the central bolt in the pre-drilled holes in the walls of the thin-walled elements and the gusset plate, setting of the required connection angle, final tightening of the central bolt and installation of self-drilling bolts. Before installing the centre bolt between the walls of the thin-walled elements, a nut and a head of the central bolt, convex sheet parts are installed, and final tightening of the central bolt is stopped when the edges of the sheet parts are thrust against the shelves of the connected thin-walled elements.
EFFECT: increase of the assembly bearing capacity.
2 cl, 5 dwg
SUBSTANCE: mounting assembly of a framework made of channel beams contains the rising upper flange made of two channel beams or C-shaped profiles, oriented with their walls to each other and connected to beams, with location of the bottom flange made of two channel beams between the channel beams of the rising upper flange and connected by bolts or welding. The mounting assembly has two trapezoidal sheet gusset plates or wedge-shaped volume gusset plates in the form of a bent channel beam of variable height, attached by vertical planes to webs of the channel beams of the lower framework flange and rested against the walls or bottom webs of the channel beams of the upper flange.
EFFECT: increase of the bearing capacity of frameworks made of the channel beams by reducing the bending stresses in the framework flanges.
SUBSTANCE: nodal joint of a rod space structure includes discs tightened with a pin pulled via central holes of discs. Between the discs there are tips of belt and diagonal rods. The nodal joint is equipped with a binding ring arranged between discs, coaxially with them, with a pin pulled through it. Each tip of the belt rod is made in the form of a hook, the horn of which is directed towards one of the discs and comprises an axis arranged perpendicularly to the axis of the belt rod, and each tip of the diagonal rod is made in the form of a hook, the horn of which is directed towards the other disc and comprises an axis arranged as inclined towards the axis of the diagonal rod. Horns of all hooks are arranged in the hole of the binding ring around the pin.
EFFECT: reduced labour intensiveness and higher reliability of a nodal joint.
9 cl, 6 dwg
SUBSTANCE: invention relates to the field of construction, namely, to units of connection of tubular rods, which are implemented when manufacturing supports of power transmission lines, cellular communication supports, etc. The unit of coupling of tubular rods includes an upper single tubular rod, to the end of which a horizontal flange is fixed, and a response flange, to which at the angle there are ends of lower tubular rods fixed. The response flange is made as separate for each lower tubular rod. Besides, at the end of each tubular rod there are two vertical flanges on each one, being tightened by bolts with similar flanges of adjacent ends of the lower tubular rods. The horizontal and response flanges along the perimeter are tightened by bolts.
EFFECT: increased stiffness of a unit.
2 cl, 4 dwg
SUBSTANCE: invention relates to a connection head for a system of assembly of structures with one upper end and one lower end. A middle longitudinal axis is stretching between the upper and lower end, and at least one connection flange arranged between upper and lower end with the support surface for beam adjacency. According to the invention the connection flange and the support surface have side displacement relative to the radial plane to the longitudinal axis, and the support surface is arranged in parallel to the radial plane.
EFFECT: improved design.
4 cl, 9 dwg
SUBSTANCE: girder supporting joint on truss includes upper truss band and adjoining diagonal braces with misaligned axes. In a truss joint, a girder rests on truss band with eccentricity causing the joint to rotate in a direction opposite to rotation caused by brace misalignment. Crossing point of upper band axis with compressed diagonal brace axis is considered to be the centre of truss joint rotation, and girder support eccentricity is e=M/P where M is the joint torque in girder generated by forces in diagonal braces adjoining the band; P is a force exerted by the girder on upper truss band.
EFFECT: reduced material consumption per truss in girder coverage.
SUBSTANCE: joint comprises ends of connected elements with separate flanges along the height of the cross section and bracing bolts. A curvilinear sheet gusset is placed between separate flanges. The gusset is fixed by the ends to flanges, and along the convex surface - to the preliminarily cut cross section of the connected elements.
EFFECT: increased bearing capacity of a connection.
FIELD: building, particularly connections specially adapted for particular building parts or for particular building structures and units.
SUBSTANCE: method involved using embedded members made as metal cylindrical cartridges arranged in concrete body of units to be connected in joint area thereof and metal connection member. Cylindrical cartridge interior is previously filled with adhesive composition. One end of connection member is placed in metal cartridge of the first unit to be joined, another end is inserted in that of the second one. Flange is welded to metal cartridge end. Flange is bored at 40° - 50° for the depth of 0.5 - 0.7 of flange thickness and conical flange bore passes into cylindrical one having dimension corresponding to metal connection diameter, which forms fixing clawing funnel. Ratio between inner cartridge diameter and connection member diameter is equal to dc,in/dcm = 1.5 - 2.0, where dc,in is inner cartridge diameter, dcm is metal connection diameter. Wherein resting outline is formed in area of metal cartridge abutment to flange. Resting outline has ledge of not less than 5 mm when connection member diameter is 10 - 30 mm, which prevents shear deformation development, increases squeezing degree and blocks metal connection. Cartridge has length Lc = (10-12)·dcm, which prevents slip of metal connection.
EFFECT: simplified assemblage technology.
FIELD: building, particularly means for connecting building structures.
SUBSTANCE: joining device comprises several similarly sized members overlapped so that non-contacting parts are spaced apart. The members are connected with bolt. Connection parts of each member are formed as rimmed orifice having extension and depression with central aperture. Bend is made on one member side. Extension and depression may be shaped as cone, ball or truncated pyramid and formed on one or both member ends. Bolt has a cavity, outer contour of bolt head mates that of inner depression.
EFFECT: reduced labor inputs for building structure mounting and demounting.
2 cl, 4 dwg
FIELD: building, particularly for forming wooden arches, frames and trusses.
SUBSTANCE: ridge unit comprises adhesive-bonded wooden members, hinge and covering members. Unit is provided with glass-fiber plates defining curvilinear section in plane and glass-fiber semispherical heads arranged in glass-fiber plate centers. Semispherical heads are inserted in depressions made in glass-fiber centering rim. The rim edges are inserted in slots of wooden covering members. Glass fibers in curvilinear plates are oriented along plate height and width of adhesive-bonded wooden member ends. The plates does not project beyond boundaries of above ends.
EFFECT: increased strength and reduced material consumption.
FIELD: building, particularly to produce light building structures, namely in building site.
SUBSTANCE: connection includes ends of members to be connected, tightening bolts with washers. Conical depression and conical boss are formed in washer surfaces facing each other. When nut is tightened on tightening bolt the members are jammed in conical cavity between the washers.
EFFECT: increased load-bearing capacity of the connection.
3 cl, 3 dwg
FIELD: building, particularly to create rod structures of pipes.
SUBSTANCE: butt-joint comprises tubular rod ends, ribs and tightening bolts. The ribs are inserted in cuts made in tubular rods and connected one to another in crossing areas along the full length thereof. Flanges are spaced from tubular rod ends.
EFFECT: reduced flange mass.
2 cl, 4 dwg
FIELD: building, particularly to connect arch members during movable building erection.
SUBSTANCE: joint connection comprises arch member ends with fastening members fixedly connected to arch member ends, cylindrical joint insert with two side covering members connected thereto and tightening bolts. The fastening members are made as pipe cuts. The side covering members are provided with coaxial orifices arranged along a circle. Fastening members pass through the coaxial orifices.
EFFECT: simplified production and increased accuracy of joint connection assemblage.
FIELD: building, particularly to connect rod members of building structure with triangular three-layered roof deck panels.
SUBSTANCE: joint connection comprises three-dimensional hollow member to connect rods of triangular grid. The hollow member is solid and defines hexagon. The hollow member has one truncated end. The hollow member comprises support panel made as round plate with U-shaped spaced apart clips fixedly connected to plate along plate perimeter. The clips are adapted for deck panels connection. Triangular three-layered panels are overlapped and connected one to another. Mounting covering strips are connected to ends of all panels so that one strip end is flush with upper rib surface, another strip end is inserted in U-shaped clip.
EFFECT: increased load-bearing capacity of the structure.
FIELD: building, particularly means to reinforce timber structures along with member connection on head block.
SUBSTANCE: reinforcement unit comprises compressed rod, belt and reinforcing side covering plates. The plates are made of angle bars and provided with transversal diaphragms. Side covering plates enclose belt section corners and pass through slots made in compressed rod.
EFFECT: increased load-bearing capacity, prevention of head block unit deformation and shearing.
SUBSTANCE: pipe junction comprises ends of pipes that are set one in the other, face plug, slots made in the pipe of greater diameter, and connecting member secured to the pipes by welding. The connecting member is made of a ring member mounted at the end of the pipe of smaller diameter, and the slots in the pipe of greater diameter do not reach the end of the pipe.
EFFECT: enhanced strength and simplified manufacturing of the joint.
FIELD: metal truss building, particularly to erect bridge span structures.
SUBSTANCE: joint includes a number of segments and connection pipes. The joint is formed as two stamped halves connected with each other by welds to form cylindrical connection pipes provided with flanges. The flanges are welded to the connection pipe ends.
EFFECT: improved manufacturability and operational reliability.