Contact screw butt joint of precast reinforced concrete columns

FIELD: construction.

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.

4 dwg

 

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.



 

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