Method for reinforcing concrete columns by adopting UHPC

A technology for concrete columns and concrete structures, which is used in construction, building maintenance, building construction, etc., can solve the problems of large space occupied by concrete columns, affecting the building area, and increasing labor costs, so as to improve compactness and homogeneity. performance, reducing labor costs and time costs, and facilitating construction

Active Publication Date: 2018-08-21
陕西建研结构工程股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use a large number of wooden formwork supports in the reinforcement process, and it needs to be dismantled after the reinforcement is completed. Due to the complicated process of formwork support and formwork removal, it consumes more manpower and time, and the cost of using wooden formwork is higher; When strengthening the longitudinal steel bars, manual binding must be used, and the construction period is long, which further increases the labor cost
In addition, the method of enlarging the cross-section needs to thicken the concrete column by about 10 cm on each side to achieve the effect of reinforcement. If the thickening is large, the reinforced concrete column will take up a large space, which seriously affects the usable area of ​​the building.

Method used

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  • Method for reinforcing concrete columns by adopting UHPC
  • Method for reinforcing concrete columns by adopting UHPC
  • Method for reinforcing concrete columns by adopting UHPC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Taking C35 concrete column (length 700mm×width 700mm×height 4800mm) as an example, the design value of axial compressive strength of C35 concrete is f c0 =16.7N / mm 2 , the reinforcement of C35 concrete column is: longitudinal reinforcement 16D20, stirrup C8@100 / 200, design value of longitudinal reinforcement tensile strength f y0 =435N / mm 2 , design value of compressive strength of longitudinal reinforcement f y0' =410N / mm 2 , design value of stirrup tensile strength f yg =360N / mm 2 ; Design value of axial compressive bearing capacity of C35 concrete column N 0 =9768.8kN.

[0031] like figure 1 and figure 2 As shown, this embodiment includes the following steps:

[0032] Step 1: Carry out roughening treatment on the surface of the concrete column 2; the roughening treatment adopts a 1.5kg-2.5kg pointed chisel hammer to chisel pits on the concrete bonding surface, forming spots with a depth of 3mm and a number of spots of 600 points / m 2 ~800 points / m 2 unifo...

Embodiment 2

[0037] Taking the C40 concrete column (length 650mm×width 650mm×height 4000mm) as an example, the design value of concrete axial compressive strength f c0 =19.1N / mm 2 ; The reinforcement of C40 concrete column is: longitudinal reinforcement 16D20, stirrup C8@100 / 200, design value of longitudinal reinforcement tensile strength f y0 =435N / mm 2 , design value of compressive strength of longitudinal reinforcement f y0' =410N / mm 2 , design value of stirrup tensile strength f yg =360N / mm 2 ; Design value of axial compressive bearing capacity of C40 concrete column N 0 =10175kN.

[0038] like figure 1 and figure 2 As shown, this embodiment includes the following steps:

[0039] Step 1. The surface of the concrete column 2 is subjected to roughening treatment; the roughening treatment uses a 1.5kg-2.5kg pointed chisel hammer to chisel out pits on the concrete bonding surface, forming spots with a depth of 4mm-5mm, Plum blossom-shaped distribution with a spacing of 30mm;

...

Embodiment 3

[0044] Taking the C40 concrete column (length 700mm×width 700mm×height 4200mm) as an example, the design value of the axial compressive strength of concrete f c0 =19.1N / mm 2 ; The reinforcement of C40 concrete column is: longitudinal reinforcement 16D20, stirrup C8@100 / 200, design value of longitudinal reinforcement tensile strength f y0 =435N / mm 2 , design value of compressive strength of longitudinal reinforcement f y0' =410N / mm 2 , design value of stirrup tensile strength f yg =360N / mm 2 ; Design value of axial compressive bearing capacity of C40 concrete column N 0 =12000kN.

[0045] like figure 1 and figure 2 As shown, this embodiment includes the following steps:

[0046] Step 1. The surface of the concrete column 2 is subjected to roughening treatment; the roughening treatment uses a 1.5kg-2.5kg pointed chisel hammer to chisel out pits on the concrete bonding surface, forming spots with a depth of 4mm-5mm, Plum blossom-shaped distribution with a spacing of 30...

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Abstract

The invention discloses a method for reinforcing concrete columns by adopting UHPC. The method comprises the steps that 1, rough chiseling treatment is conducted on the surfaces of concrete columns; 2, multiple shear-resistant steel bars are implanted into the surfaces, undergoing rough chiseling treatment, of concrete columns, and parts of shear-resistant steel bars extend out of the surfaces ofthe concrete columns; 3, the surfaces of the concrete columns with implanted shear-resistant steel bars are coated with the UHPC until the UHPC completely wraps the parts, extending out of the surfaces of the concrete columns, of the concrete columns and the shear-resistant steel bars, and UHPC layers are formed. According to the method, the UHPC containing silica fume, sand and steel fiber is directly applied to the surfaces of the concrete columns with implanted shear-resistant steel bars to form the UHPC layers, the UHPC layers are bonded with original concrete to form a whole after reinforcement, the overall structure performance of the concrete columns is improved, the plastic deformation capability of the concrete columns is ensured, timber formworks are not needed in the reinforcement process, the reinforcement cost is reduced, the reinforcement speed is improved, and the use area of a building is not affected.

Description

technical field [0001] The invention belongs to the technical field of building structure reinforcement, and in particular relates to a method for reinforcing concrete columns by using UHPC. Background technique [0002] In the construction industry, concrete columns are generally reinforced by increasing the cross-section method. This method needs to use a large number of wooden formwork supports in the reinforcement process, and it needs to be dismantled after the reinforcement is completed. Due to the complicated process of formwork support and formwork removal, it consumes more manpower and time, and the cost of using wooden formwork is higher; When reinforcing the longitudinal steel bars, manual binding must be used, and the construction period is long, which further increases the labor cost. In addition, the enlarged cross-section reinforcement method needs to increase the thickness of the concrete column by about 10 cm on each side to achieve the effect of reinforcem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02C04B28/04
CPCC04B28/04E04G23/0218C04B18/146C04B14/06C04B14/48C04B16/0633C04B2103/302C04B2103/50
Inventor 李林高宗祺常亚峰张涛皇垚华景晓辉李俊
Owner 陕西建研结构工程股份有限公司
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