When the mechanical components are installed on the concrete foundation, one end of the J-shaped, L-shaped, 9-shaped, or U-shaped bolts is buried in the concrete.
Anchor bolts are generally made of Q235 steel, which is smooth round. Rebar (Q345) has high strength, and it is not as easy to make a nut thread as it is to make a round nut. For smooth round anchor bolts, the burial depth is generally 25 times its diameter, and then a 90-degree hook about 120mm long is made. If the diameter of the bolt is very large (such as 45mm) and the burial depth is too deep, you can weld a square plate to the end of the bolt, that is, just make a big head (but there are certain requirements). The burial depth and the hook are all to ensure the friction between the bolt and the foundation to prevent the bolt from being pulled out and damaged. The tensile capacity of the anchor bolt is the tensile capacity of the round steel itself.
According to different shapes,Anchor bolts can be divided into: L-shaped embedded bolts, J-shaped embedded bolts, 9-shaped embedded bolts, U-shaped embedded bolts, welded embedded bolts, and base plate embedded bolts.
Features and advantages of J-type bolts
The shaft and nut of J-type bolts are J-shaped, so they are stronger. Other ordinary bolt shafts are generally hexagonal and are easily twisted and bent. The J-shaped bolt shaft has better strength and can carry greater force to ensure the safety and stability of the building. In addition, the thread of the J-type bolt is also J-shaped, with a longer thread extension, a larger number of threads, stronger corrosion resistance, and a longer maintenance cycle.
How to use J-bolts correctly?
Anchor bolt installation is a very important step in building construction. When purchasing J-type bolts, you need to pay attention to the two parameters of thread pitch and pitch. Pitch refers to the distance between two adjacent rib threads at the same position on the spiral; pitch refers to the distance between two adjacent rib threads at the same position on the spiral. During actual installation, it is necessary to select a suitable wrench for fixation according to the thread pitch and pitch data; if the wrench used does not match, it may cause the bolt to be damaged or fail.
Anchor bolt type B GB /T 799 (B) - 2020
|
|
M8 |
M10 |
M12 |
M16 |
M20 |
M24 |
M30 |
M36 |
M42 |
M48 |
M56 |
M64 |
M72 |
|
|
d |
||||||||||||||
|
P |
|
1.25 |
1.5 |
1.75 |
2 |
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
6 |
6 |
|
b |
Deviation({{0}}P,0) |
31 |
36 |
40 |
50 |
58 |
68 |
80 |
94 |
106 |
120 |
140 |
160 |
180 |
|
L1 |
|
48 |
60 |
72 |
96 |
120 |
144 |
180 |
216 |
252 |
288 |
336 |
384 |
432 |
|
R |
|
16 |
20 |
24 |
32 |
40 |
48 |
60 |
72 |
84 |
96 |
112 |
128 |
144 |
|
x |
|
3.2 |
3.8 |
4.3 |
5 |
6.3 |
7.5 |
9 |
10 |
11 |
12.5 |
14 |
15 |
15 |