CN103388377A

CN103388377A - Novel FRP (fiber reinforced plastic)-steel tube-epoxy resin-sea sand concrete compression member

Info

Publication number: CN103388377A
Application number: CN2013103417977A
Authority: CN
Inventors: 韩林海; 安钰丰; 李威
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2013-11-13

Abstract

The invention belongs to the field of engineering structures, and particularly relates to a novel FRP (fiber reinforced plastic)-steel tube-epoxy resin-sea sand concrete compression member. The member is characterized in that an epoxy resin layer is coated on the inner surface of a steel tube, and the steel tube is internally filled with sea sand concrete; an FRP material layer is overwrapped on the outer surface of the steel tube; because the FRP material layer is overwrapped outside the steel tube, and the steel tube is prevented from being in direct contact with the external environment, so that the durability of the steel tube is improved obviously; meanwhile the epoxy resin layer is coated on the inner surface of the steel tube, so that the sea sand concrete and the steel tube are isolated, and the corrosion effect of chloride ions in sea sand on the steel tube is avoided; and the potential safety hazards of the sea sand concrete are reduced, and the application of the sea sand concrete is promoted. The member is applied to high-corrosion coastal and offshore areas and the like, bears the load mainly focused on axle load, and has favorable economical and environmental benefits.

Description

A kind of new type FRP-steel pipe-epoxy resin-marine sand concrete compression-member

Technical field

The invention belongs to the engineering structures field, be specifically related to a kind of new type FRP-steel pipe-epoxy resin-marine sand concrete compression-member.

Background technology

Structural Endurance Problem is a problem very important and in the urgent need to address, is subject to the extensive concern of all circles, and especially in coastal and offshore area, structure, due to the erosion that is subject to marine environment, causes endurance issues particularly outstanding.Be applied to coastal and steel pipe or encased structures offshore area, the pipe corrosion problem is severeer, and at present common anti-corrosion measure is generally zinc-plated or japanning, but anti-corrosion material has certain loss amount every year, need again zinc-plated or japanning after reaching certain time limit, economic consumption is larger.Day by day in short supply due to the river sand resource, the marine sand concrete that adopts extra large sand to be configured to, more and more be applied in the middle of Practical Project.But the chlorion in extra large sand can produce catalytic action to reinforcement corrosion, so the extra large sand of applying in engineering will strictly control chloride ion content,, if deal with improperly, will cause structure to face serious endurance issues, causes serious economic loss and potential safety hazard.Fill marine sand concrete in steel pipe,, because concrete is in closed environment, cause the needed oxygen of chloride ion corrosion steel pipe and moisture to can not get supplementing, make extent of corrosion weaken gradually.Therefore steel pipe sea sand coagulation structure is compared with the ordinary concrete structure, more is conducive to the application of marine sand concrete.The FRP material is high and corrosion-resistant etc. a little many owing to having intensity, is being used widely aspect engineering repairing and reinforcement and new building.When Axial Compression Loads is master's load, have or not bonding to have no significant effect the stress performance of concrete filled steel tube between steel pipe and concrete.

Summary of the invention

The purpose of this invention is to provide new type FRP-steel pipe that a kind of structure durability that can be applied to coastal and offshore area can be good-epoxy resin-marine sand concrete compression-member.

The technical solution used in the present invention is:

Inner surface at steel pipe applies epoxy resin layer, and in steel duct, fills marine sand concrete, at the external surface coating FRP of steel pipe material layer.

The cross section of described steel pipe is circular, square or rectangular.

Described steel pipe is clod wash, welding or jointless structure steel pipe.

Beneficial effect of the present invention is:

The main Axial Compression Loads of this member is main load.Because epoxy resin is kept apart steel pipe and concrete, nothing bonding between steel pipe and concrete, but as compression-member, this member has advantages of the common steel tube sea-sand concrete member, be steel pipe to the effect of concrete Constrained, improve concrete strength and ductility, concrete has limited the cripling of steel pipe, steel pipe serves as concrete-pouring template, constructs more convenient.But with the common steel tube sea-sand concrete member, compare, himself advantage is arranged, be that steel pipe and FRP closely bond together by epoxy resin, make concrete be subject to the double constraints of steel pipe and FRP, its strength and ductility further improves, steel pipe does not directly contact external environment condition, but by the FRP of excellent in durability, contacts external environment condition, makes the total endurance quality significantly improve.Although the common steel tube sea-sand concrete member can slow down in extra large sand chlorion to pipe corrosion, but can't thoroughly eliminate corrosion phenomenon, and at steel pipe internal-surface, be coated with epoxy resin, marine sand concrete and steel pipe are isolated to come, there do not is the etching problem of chlorion to steel pipe in extra large sand, reduce the potential safety hazard of marine sand concrete, promoted the application of marine sand concrete.This new type of component is applied to coastal and contour corrosion area, coastal waters, has good economy and environment benefit.

Description of drawings

Fig. 1 to Fig. 3 is respectively that cross section is plan view circular, square, rectangular structure of the present invention;

Fig. 4 is the schematic perspective view of Fig. 1.

Number in the figure:

The 1-FRP material layer, 2-steel pipe, 3-epoxy resin layer, 4-marine sand concrete.

The specific embodiment

The invention provides a kind of new type FRP-steel pipe-epoxy resin-marine sand concrete compression-member, the present invention will be further described below in conjunction with the drawings and specific embodiments.

The structure of this member is: the inner surface at steel pipe 2 applies epoxy resin layer 3, and at the inner marine sand concrete 4 of filling of steel pipe 2, at the external surface coating FRP of steel pipe 2 material layer 1.The cross section of steel pipe 2 can adopt circle (Fig. 1 and Fig. 4), square (Fig. 2) or rectangle (Fig. 3).Steel pipe 2 can adopt clod wash, welding or jointless structure steel pipe.

Due to steel pipe 2 outer cladding FRP material layers 1, avoid steel pipe 2 directly with external environment, to contact, significantly improved its durability; Steel pipe 2 inner surfaces apply epoxy resin layer 3 simultaneously, marine sand concrete 4 and steel pipe 2 are completely cut off come, and do not have the corrosiveness of chlorion to steel pipe in extra large sand, have reduced the potential safety hazard of marine sand concrete 4, have promoted the application of marine sand concrete.This component application, in coastal and contour corrosion area, coastal waters, bears take axial compression as main load, has good economy and environment benefit.

Claims

1. new type FRP-steel pipe-epoxy resin-marine sand concrete compression-member, it is characterized in that, inner surface at steel pipe (2) applies epoxy resin layer (3), and at the inner marine sand concrete (4) of filling of steel pipe (2), at the external surface coating FRP material layer (1) of steel pipe (2).

2. new type FRP-steel pipe according to claim 1-epoxy resin-marine sand concrete compression-member, is characterized in that, the cross section of described steel pipe (2) is circular, square or rectangular.

3. new type FRP-steel pipe according to claim 1-epoxy resin-marine sand concrete compression-member, is characterized in that, described steel pipe (2) is clod wash, welding or jointless structure steel pipe.