Civil Engineering Reference
In-Depth Information
When the additional reinforced concrete ring beam is connected with the wall by common
anchor bolts, one end of the anchor bolt should be embedded into the ring beam in the
shape of a right-angle hook, and the embedded length should be 30
d
(
d
is the diameter of
the anchor bolt). And the other end should be fastened by the nut, as in Fig. 4.17.
bolt
30
d
2
φ
12 oblique bar
1000
Fig. 4.17
Retrofitting for connections of ring beam and wall with common anchor bolts.
When the additional reinforced concrete ring beam is connected by pin keys, the height of
pin keys should be the same as ring beams, and their width should be 180 mm. The insert
depth of pin keys in walls should not be less than 180 mm or the thickness of walls, and the
reinforcement should not be less than 4
φ
8, the spacing may be 1000
∼
2000 mm. Pin keys of
exterior walls may be set on both sides of windows, and it is necessary to avoid the damage
of walls when chiseling holes for pin keys, as in Fig. 4.18.
Fig. 4.18
Retrofitting for connections of reinforced concrete ring beam and pin keys.
Section steel ring beams should be connected with walls by common bolts at intervals of
1000
1500 mm and the diameter of bolts should not be smaller than
φ
12. And the gap
between ring beams and walls can be plugged firmly by dry cement mortar.
∼
