CN2047688U

CN2047688U - Steel-pipe concrete pillar with high strength

Info

Publication number: CN2047688U
Application number: CN 89206622
Authority: CN
Inventors: 冯文林
Original assignee: NAVAL ENGINEERING DESIGN RESEARCH BUREAU PLA
Current assignee: NAVAL ENGINEERING DESIGN RESEARCH BUREAU PLA
Priority date: 1989-05-08
Filing date: 1989-05-08
Publication date: 1989-11-15

Abstract

The utility model relates to a high-strength steel-pipe concrete column formed by that a spiral reinforcement is arranged in the steel pipe, and the core concrete has high strength (600-1000 kg/square centimeter). The high-strength steel-pipe concrete column has the advantages of axial compressive strength of 2000-2400 kg/square centimeter, raised by 1-3 times than a common steel-pipe concrete column, elastic range raised to 80% of ultimate bearing capacity, volume weight only half of a steel column and good ductility. The utility model is suitable for superhigh buildings and various column members with large axial pressure under antiseismic and antiknock conditions.

Description

Steel-pipe concrete pillar with high strength

The utility model belongs to a kind of building structural element.

Existing encased structures member is the ordinary concrete about cast 300 kg/cm in common steel tube, forms steel pipe and the compound member of concrete.When being used for axial compression, the component strength of making than steel pipe or concrete homogenous material is improved, and is therefore applied.But because the ordinary concrete label is lower, the elastic range of the common steel tube concrete component of making is little, and is lower than strong (being the intensity of Unit Weight), and especially when steel ratio was big, elastic range only accounted for half of ultimate bearing capacity; When reaching capacity load, appearance is than large plastometric set, the strength of materials can not be given full play to, and the intensity of common steel tube concrete column is general only in the 600-1000 kg/cm, is difficult to make the intensity height of some requirement of engineering, in light weight, structural element that ductility is good.

The purpose of this utility model is to pour into a mould high-strength concrete in steel pipe, to make concrete filled steel tubular column.

Concrete filled steel tubular column of the present utility model is made up of steel pipe, core body concrete, column cap, base, it is characterized in that being provided with spiral reinforcement along tube wall in the round steel pipe, and the core body concrete is a high-strength concrete, and column cap, base are welded into steel plate.

High-strength concrete is the new concrete that middle nineteen seventies occurs, can make with common process at present, be meant the concrete of compressive strength in the 600-1000 kg/cm, its characteristic is the intensity height, and fragility is big, in being cast in steel pipe, particularly in thin-wall steel tube, added spiral reinforcement, increase after the cuff effect of contraction, can keep the high performance of its intensity, overcome the big deficiency of its fragility simultaneously, improved plastic property, formation intensity height, the structural element that ductility is good.After tested, the average axial compressive strength of concrete filled steel tubular column can reach the 2000-2400 kg/cm, than the high 1-3 of axial compressive strength of common steel tube concrete column doubly; Its elastic range can be brought up to 80% of ultimate bearing capacity, and under the condition of identical steel ratio, the elastic range of common steel tube concrete column has only 50% of ultimate bearing capacity; The unit weight of concrete filled steel tubular column is about 50% of steel, compares with the steel column of equal bearing capacity, can save steel 60-70%; It has good ductility, and its ductility ratio ratio of elastic deformation (maximum plastic deformation with) can reach more than 10.Be applicable to super high rise building, and the very big pillar member of various axial compressions under the antidetonation, antiknock condition.

Below in conjunction with drawings and Examples, the utility model will be further described.

Fig. 1 is the front view of concrete filled steel tubular column.

Fig. 2 is the 1-1 sectional drawing of Fig. 1.

As seen from the figure, concrete filled steel tubular column is formed cylinder by steel pipe 1, spiral reinforcement 2 and high-strength concrete 3, and the cylinder welded top has steel plate column cap 4, and the bottom is welded with steel plate base 5.Diameter of steel tube is 219 millimeters, 8 millimeters of wall thickness, steel pipe is high 700 millimeters, spiral reinforcement adopts 5 millimeters of cold drawn wire ∮, 25 millimeters of spacings, and high-strength concrete is by 525# Portland cement, quality sand and stone aggregate, and the NF water reducing agent is formulated, its compressive strength is 818 kg/cm, and the bearing capacity of actual measurement concrete filled steel tubular column is 7,600 thousand newton, promptly reaches the intensity of 2017 kg/cm (201.7 MPa).

When adopting thick walled steel tube, do not establish spiral reinforcement in the steel pipe, when directly pouring into a mould high-strength concrete, can obtain much larger than the effect of common steel tube concrete column intensity equally.

Claims

1, a kind of concrete filled steel tubular column is made up of steel pipe, core body concrete, column cap, base, it is characterized in that the steel pipe inwall is provided with spiral reinforcement, and the core body concrete is a high-strength concrete, and column cap, base are welded into steel plate.

2, concrete filled steel tubular column as claimed in claim 1 is characterized in that the core body concrete is the high-strength concrete material of compressive strength in the 600-1000 kg/cm.

3, concrete filled steel tubular column as claimed in claim 1 when it is characterized in that adopting thick walled steel tube, can not established spiral reinforcement.