CN102392541A - Method for reinforcing concrete column by utilizing PVC-FRP (Poly Vinyl Chloride-Fiberglass Reinforced Plastic) pipe - Google Patents

Abstract

The invention provides a method for reinforcing a concrete column by utilizing a PVC-FRP (Poly Vinyl Chloride-Fiberglass Reinforced Plastic) pipe and belongs to the technical field of civil engineering. The method is suitable for maintaining and reinforcing the concrete columns in civil buildings, industrial plants and bridge structures. By mainly aiming at the reinforced concrete column, a PVC pipe is sheathed outside the concrete column, a reinforcing steel bar is configured in the PVC pipe, FRP cloth is wound outside the PVC pipe to form restraint action on the concrete column with the PVC pipe, and the internal pressure of the PVC pipe sheathed outside should reach above 1Mpa. The FRP cloth can adopt a carbon fiber composite material, a glass fiber composite material or an aramid fiber composite material. Compared with the traditional reinforcing method, the method for reinforcing the concrete column by utilizing the PVC-FRP pipe has the advantages that the reinforced concrete column is high in bearing capacity, small in cross section size and good in ductility and durability; and the method is convenient to construct, low in construction price and the like.

Description

A kind of method with PVC-FRP pipe reinforced concrete column

Technical field

The invention belongs to technical field of civil engineering, be specifically related to a kind of method with PVC-FRP pipe reinforced concrete column, this method is applicable to the maintenance and the reinforcing of concrete column in civilian construction, industrial premises and the bridge construction.

Background technology

Reinforced concrete structure is in long-term use; Inner, outside, and the human factor effect under; As time goes on, with the aging and structural damage of generating material, the accumulation of this damage will cause structural performance deterioration, bearing capacity decline, endurance quality to reduce.In order to make structure still can satisfy design specifications, must reinforce and reinforcement these structures about the requirement of bearing capacity with normal functional performance.

Existing reinforcing mainly contains enlarging section method, encased steel reinforcing method and FRP reinforcing method with the mode of reinforcement.Mainly there is following shortcoming in the enlarging section method: increase the area of structure, reduce usage space; Need formwork, operations such as form removal, the construction period is longer; It is not remarkable that bearing capacity improves effect.Mainly there is following shortcoming in the encased steel reinforcing method: rolled steel dosage is big, and expense is high; Structure durability is relatively poor; The steel plate end is difficult for anchoring.Mainly there is following shortcoming in the FRP reinforcing method: the FRP consumption is many, and expense is high; The concrete lateral deformation is inhomogeneous under the load action, makes FRP produce stress and concentrates, and causes the FRP utilization rate low.

Summary of the invention

The present invention is directed to shortcoming and deficiency that existing reinforcement means exists, a kind of method with PVC-FRP pipe reinforced concrete column is provided, these method concrete steps are following:

(1) former concrete column surface is handled, remove the topping of former concrete column;

(2) according to requirement for bearing capacity, vertical muscle of configuration and stirrup around former concrete column, and assembling reinforcement cage;

(3) pvc pipe is sawn into two parts along diameter, is enclosed within the outside of concrete column, be bonded to integral body to two parts pvc pipe with epoxy resin then;

(4) in the surperficial precoating layer glue of pvc pipe, and make epoxy resin fully soak into FRP cloth, twine FRP cloth, maintenance a period of time, process the PVC-FRP pipe according to certain hoop spacing;

(5) concreting between PVC-FRP pipe and former concrete column forms PVC-FRP pipe reinforced concrete column.

The present invention has the following advantages:

(1) reduces the sectional dimension of member;

(2) the PVC-FRP pipe can serve as template, saves operations such as formwork, form removal, shortens construction period;

(3) utilization rate of FRP material is high;

(4) bearing capacity is high, light weight;

(5) consumption of FRP material is less, saves cost;

(5) excellent in durability;

(6) integrality performance of the structure is good.

The inventive method is compared with traditional reinforcement means, has that bearing capacity height, sectional dimension are little, an advantage such as ductility and good endurance, easy construction, cost are low, has broad application prospects and development space.

Description of drawings

Figure: be the cross sectional representation of PVC-FRP pipe reinforced concrete column.

Among the figure: 1-pvc pipe; 2-former concrete column; 3-adhesive glue; 4-after join vertical muscle; 5-after join stirrup; 6-FRP cloth; 7-back pouring concrete.

The specific embodiment

(1) former concrete column 2 is handled, removed the topping of former concrete column 2, remove the floating dust on concrete column surface; For strengthening adhesion stress and the globality between back pouring concrete and the former concrete column, guarantee its co-operation, should make former concrete surface coarse as far as possible; And back pouring concrete strength grade is greater than former concrete column strength grade.

(2) according to requirement for bearing capacity, calculate the required quantity of reinforcement of concrete column with reference to China's relevant design standard, around former concrete column 2, dispose longitudinal stress reinforcing bar 4, lateral tie 5, and the assembling reinforcement cage.

(3) according to requirement for bearing capacity; Select the pvc pipe 1 (press in the pvc pipe and reach more than the 1Mpa) of suitable cross-section size; Straight line is sawn into two parts along the center of circle with pvc pipe 1, the pvc pipe that cuts is glued with adhesive glue 3, and guarantee that the center of gravity of pvc pipe 1 overlaps with the center of gravity of former concrete column 2.

(4) stir layer glue, equably it is brushed in pvc pipe 1 surface, FRP cloth 6 is fully soaked into epoxy resin, twine FRP cloth 6 according to the FRP hoop spacing and the strip width of Design of Bearing Capacity with cylinder; Constantly extruding to guarantee globality between FRP cloth 6 and the pvc pipe 1, does not allow bubble in the winding process; Whole winding process repeats, up to reaching the needed fiber number of plies.After FRP cloth 6 twines, PVC-FRP is managed the maintenance certain hour,, form the PVC-FRP pipe up to epoxy cure.

(5) concreting 7 between PVC-FRP pipe and former concrete column 2, the maintenance certain hour forms PVC-FRP pipe reinforced concrete column.

Claims (1)

1. method with PVC-FRP pipe reinforced concrete column is characterized in that these method concrete steps are following:

(1) former concrete column surface is handled, remove the topping of former concrete column;

(2) according to requirement for bearing capacity, vertical muscle of configuration and stirrup around said former concrete column, and assembling reinforcement cage;

(3) pvc pipe is sawn into two parts along diameter, is enclosed within the outside of concrete column, be bonded to integral body to two parts pvc pipe with epoxy resin then;

(4) in the surperficial precoating layer glue of said pvc pipe, and make epoxy resin fully soak into FRP cloth, twine FRP cloth, maintenance a period of time, process the PVC-FRP pipe according to certain hoop spacing;

(5) concreting between said PVC-FRP pipe and former concrete column forms PVC-FRP pipe reinforced concrete column.

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