CN2102325U

CN2102325U - Reinforced steel rib srew thread connection part

Info

Publication number: CN2102325U
Application number: CN 90221362
Authority: CN
Inventors: 胡海涛
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-09-24
Filing date: 1990-09-24
Publication date: 1992-04-22

Abstract

The utility model relates to a reinforced connection component of steel bar screw threads, comprising the screw thread ends of two connected steel bars and a sleeve provided with the same type inner screw threads. The dangerous cross sectional area of the screw thread ends of the connected steel bars is larger than the cross sectional area of the raw materials; the end parts of the connected steel bars are primarily widened through a technology approach, and screw threads are cut on the surfaces of the widened sections; accordingly, the reinforced connection component of steel bar screw threads is formed. The tensile strength of a component formed through the ends of the steel bar screw threads is better than the intensity of the raw material of the connected steel bars; accordingly, the component can be used for various structures, such as a beam, a column, a wall, etc. without limit.

Description

Reinforced steel rib srew thread connection part

The utility model relates to the mechanical connection member of reinforcing bar in the civil structural engineering, particularly relates to comprising 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 comprise cylindrical thread with two kinds of tapered tread.European patent EP-0309970 discloses the technology of a key name for " reinforcing rib connecting elements ", and Chinese patent 90202707.7 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 purpose of this utility model 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.

The purpose of this utility model 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, wherein Fig. 5 a with the end---screw cutting not, Fig. 5 b---have cut cylindrical thread, Fig. 5 c---and have 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 two kinds of reinforcement screw connection members of this that the utility model 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 utility model has such advantage at least, promptly form connecting elements with steel thread end of the present utility model, 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 utility model 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, comprise connected two, the threaded end 5 or 6 of reinforcing bar, 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 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.