Building steel-column foundation lengthening bolt and lengthening method thereof
A technology of long bolts and steel columns, which is used in infrastructure engineering, construction material processing, construction, etc., can solve the problems of inability to ensure the strength of bolt rods, unsafe and reliable processing methods, and long on-site construction period, and achieve the construction period. Short, simple and easy to operate, low labor effect
Inactive Publication Date: 2012-05-09
CHINA 22MCC GROUP CORP
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Problems solved by technology
[0007] Disadvantages of the above several processing methods The processing method shown in step a is not safe and reliable
Because the butt weld of this kind of bolt cannot guarantee the same strength as the bolt shank on site (the pullout test has been done on site, and the weld can only bear about 60% of the tensile strength of the bolt shank)
Although the method shown in step b and c can be safe and reliable, the on-site construction period is long and the cost is high, and some site conditions are even not allowed in some projects
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Embodiment 2
[0036] Example 2, a method for extending bolts for the steel column foundation of a factory building. This method is based on the principle of equal tensile strength and is operated with reference to the construction industry standard JGJ 107-2003 general technical regulations for mechanical connection of steel bars. The original embedded bolt 7 The strength of the nut and the bolt shank matches (equal strength), therefore, the processed steel sleeve 9 calculates the outer diameter D of the steel sleeve 9 according to the principle that the tensile capacity in the length direction is greater than or equal to the tensile capacity of the pre-embedded bolt shank:
[0037] [π(D / 2) 2 -π(d / 2) 2 ]·f cylinder ≥ π(d / 2) 2 ·f bolt
[0038] 1) Get the formula: D≥d(1+f bolt / f cylinder) 1 / 2 ...
[0039] In the formula: D is the outer diameter of the steel sleeve; d is the diameter of the embedded bolt 7 and the external bolt; f sleeve: the design value of the tensile strength of the sle...
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The invention discloses a building steel-column foundation lengthening bolt and a lengthening method thereof, wherein embedded bolts are embedded in a concrete member, and external connecting bolts of the same specification with the embedded bolts are arranged; the embedded bolts are butted with the external connecting bolts; the butted parts are sleeved in steel sleeves with female screws, and the embedded bolts are connected into a whole with the external connecting bolts through the steel sleeves in equicohesive manner, so as to form lengthening bolts; the upper parts of bolt rods of the external connecting bolts of the lengthening bolts are sleeved in connecting plates of the steel member, and steel base plates are arranged on the connecting plates of the steel member; head parts of the bolt rods of the external connecting bolt are fastened and fixed by screw caps. The lengthening method is as follows: purchasing standard elements as per a calculated outer diameter of the steel sleeves; measuring size of the embedded bolts and mark lines on the embedded bolts; sawing the embedded bolts; and screwing the steel sleeves into the sawn left embedded bolts from the bottom parts of the connecting plates of the steel member. As the steel sleeves are adopted for lengthening the bolts, the method is simple and easy to carry out, the labor intensity is low, the construction period is short, and the cost is low; further, the bolts lengthened by this method are firm, durable, safe and reliable.
Description
technical field [0001] The invention relates to building construction components and methods, in particular to a plant steel column foundation extension bolt and an extension method. Background technique [0002] During the construction of industrial building workshops, since industrial workshops are generally light steel or heavy steel structures; during the construction of the steel column foundation of the workshop, the length of the leaked wire of the steel column foundation bolts is likely to be shorter than the exposed screw length of the design bolts ;According to the actual analysis on the spot, the main reasons are as follows: a. The quality of the operators is not high, and the construction management personnel have a weak sense of responsibility; b. There is a mistake in checking the elevation of the foundation bolts; c. The elevation is wrongly read during the formwork construction process ; This brings many difficulties to the installation and construction of t...
Claims
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IPC IPC(8): E04B1/41E02D27/42E04G21/00
Inventor 欧阳坤红陶松
Owner CHINA 22MCC GROUP CORP
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