CN1060133A

CN1060133A - A kind of reinforcement screw connection member of gaining in strength

Info

Publication number: CN1060133A
Application number: CN 90108083
Authority: CN
Inventors: 胡海涛
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-09-24
Filing date: 1990-09-24
Publication date: 1992-04-08

Abstract

A kind of reinforcement screw connection member of gaining in strength comprises threaded end and the sleeve with same form internal thread of connected two reinforcing bars.The dangerous area of section that is connected steel thread end is will be connected end reinforced in advance the expansion slightly by process means greater than its raw-material area of section, makes at the thick section surface screw cutting of expansion then.With the member that this steel thread end forms, its tensile strength surpasses and is connected the intensity of raw material of reinforcement rebar, thereby can use in various structures such as beam, plate, post, wall without restriction.

Description

A kind of reinforcement screw connection member of gaining in strength

The present invention relates to the mechanical connection member of reinforcing bar in the civil structural engineering, particularly relate to and comprise sleeve at the interior various diameter circle reinforcing bars and the screw connection member of notched bars.

The reinforcement screw connection member of building trade prior art comprises cylindrical thread and tapered tread two kinds.European patent EP-0 309 970 discloses the technology of a key name for " reinforcing rib connecting elements ", and Chinese patent 90 2 02707.7 has been described the technology of a similar key name for " sleeve taper thread reinforcing bar connecting elements ".These technology are seen Fig. 1 and Fig. 2, all are directly be connected the cylinder or the tapered tread of cutting a certain axial length on end reinforced 2 or 3, and with the sleeve 7 or 8 with same form internal thread these two sections reinforcing bars being coupled together then becomes a member.The reinforcement screw connection member of aforesaid prior art, no matter be cylindrical thread or tapered tread, original area of section all reduces to some extent in the end reinforced certain-length.As shown in Figure 5, section was not A1 before reinforcing bar cut, and after the cutting, was A2 to the dangerous section of cylindrical thread, was A3 to the dangerous section of tapered tread.Obviously, A2 and A3 area are all less than A1.Because effectively tension area reduces, the tensile strength of prior art reinforcement screw connection member all is lower than the tensile strength that is connected raw material of reinforcement rebar, this does not meet building trade and requires connecting elements tensile strength to be not less than the traditional habit of raw material of reinforcement rebar intensity, thereby the scope of application is very limited the general post that only is used for based on pressurized.

The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part and a kind of end reinforced thick certain-length that in advance expands that will be connected is provided, cut the new reinforcing steel bar screw connection member that its surface makes it to become threaded circular cylinder or cone afterwards again, be called for short and expand the bar reinforcement screw connection member.

Purpose of the present invention can reach by following measure, the dangerous area of section of threaded end that makes connected two reinforcing bars exactly is greater than the area of section that is connected raw material of reinforcement rebar, after connecting, obtain than being connected the more high-tensile reinforcement screw connection member of raw material of reinforcement rebar with sleeve with same form internal thread.For this reason, the threaded end that is connected reinforcing bar is shaped, the raw material that promptly use process meanses such as cold Dun, forge hot will be connected end reinforced axial certain-length expand thick in advance, expanding thick section surface screw cutting then, must make the last dangerous area of section in cutting back still greater than the area of section that is connected raw material of reinforcement rebar.

The drawing of accompanying drawing is described as follows:

Fig. 1 shows common cylinder indented bars connecting elements;

Fig. 2 shows common tapered tread reinforcing bar connecting elements;

Fig. 3 shows the thick cylindrical thread reinforcing bar connecting elements of end expansion;

Fig. 4 shows the thick tapered tread reinforcing bar connecting elements of end expansion;

Fig. 5 shows and common expands thick steel thread end contrast with the end, Fig. 5 a-screw cutting not wherein, Fig. 5 b-have cut cylindrical thread, and Fig. 5 c-has cut tapered tread.

Describe in further detail below in conjunction with most preferred embodiment shown in the drawings:

On Fig. 3, be connected end reinforced 5 and expanded slightly, and cut cylindrical thread, connect with sleeve 9 with same form internal thread; On Fig. 4, be connected end reinforced 6 and also expanded slightly, and cut tapered tread, connect with sleeve 10 with same form internal thread.The tensile strength of these two kinds of reinforcement screw connection members that the present invention proposes all is higher than the intensity that is connected raw material of reinforcement rebar.

On Fig. 5 a, D1 and A1 are respectively diameter and the area of sections that is connected raw material of reinforcement rebar 1, and D4 and A4 are respectively diameter and the area of sections that is connected the end 4 after reinforcing bar expands slightly, and L is the axial length that expands thick section.D4 generally is taken as 1.05 to 2 times of D1, and L is taken as 1 to 5 times of D1, and the both requires to be selected according to the bonding strength and the structure of threaded end.

On Fig. 5 b and Fig. 5 c, be connected end reinforced screw cutting after, dangerous area of section A5 and A6 be respectively greater than A2 and A3, and all be slightly larger than A1, thus the tensile strength that has guaranteed threaded end is not less than the intensity that is connected raw material of reinforcement rebar.

With the equipment that is connected thick method of end reinforced expansion and use is diversified, and the development level of modern machining industry is easy to accomplish these, mainly is to guarantee that the thick section of an expansion axial length is that L, diameter are D4, all meets the requirements just.

Compare with prior art, reinforcement screw connection member of the present invention has such advantage at least, promptly form connecting elements with steel thread end of the present invention, its tensile strength surpasses and to be connected the intensity of raw material of reinforcement rebar, thereby can use in various structures such as beam, plate, post, wall without restriction; And the reinforcement screw connection member of prior art, its tensile strength is lower than the intensity that is connected raw material of reinforcement rebar, and general is used in the rod structure of direct compression.

Be connected end reinforced through processing expand thick after, the mechanical performance of material has some and changes, but still can guarantee that the overall performance of connecting elements satisfies the requirement of current specifications.

The expansion bar reinforcement screw connection member that the present invention proposes, can be used for linking comprise I, II, III, IV, V at different levels, diameter is from 18 millimeters to 50 millimeters various round bars and notched bars.

Claims

1, a kind of reinforcement screw connection member of gaining in strength, the threaded end 5 or 6 that comprises connected two reinforcing bars, and sleeve 9 or 10 with same form internal thread, described reinforcement screw connection member is characterised in that: the threaded end 5 of connected two reinforcing bars or 6 dangerous area of section A5 or A6, and greater than the area of section A1 that is connected raw material of reinforcement rebar.

2, according to the described reinforcement screw connection member of gaining in strength of claim 1, it is characterized in that: the threaded end 5 or 6 that is connected reinforcing bar is shaped, promptly adopt process meanses such as Leng Dun, hot dip with diameter be the raw material of the end reinforced axial certain-length L of being connected of D1 expand slightly in advance to diameter be D4, expanding thick section surface screw cutting then, must make cutting last dangerous area of section A5 in back or A6 still greater than the area of section A1 that is connected raw material of reinforcement rebar.

3, according to the described reinforcement screw connection member of gaining in strength of claim 2, it is characterized in that: the length L that is connected the thick section of reinforcing bar expansion is taken as 1 to 5 times of this raw material of reinforcement rebar diameter D1, and the diameter D4 after expansion is thick is taken as 1.05 to 2 times of D1.