Gypsum board ceiling, always cracks, what is the reason?
Fixed gypsum board self-tapping nail spacing is too large or part of the self-tapping nail force
???? 1, to strengthen the operation of workers training.
???? 2, self-tapping the nail did not attack the keel on the timely return of the nail, and in the distance about 2-3cm from the nail to strengthen the nail.
???? 3, gypsum board fixed self-tapping screw, spacing edge size is less than 180mm, the central spacing of not more than 250mm.
???? 4, burr gypsum board attack attack nail, as far as possible to the board, from the edge of the seam is greater than 15mm, so that both to ensure that the nail on the keel, but also reduce the gypsum board edge gypsum burst.
There are several cases, there will be leveling the keel gypsum board ceiling in the external force becomes undulating, resulting in covering gypsum board to produce tension, deformation, cracks. To solve this problem is to pay attention to the construction of the structure and take some necessary measures, such a situation is relatively large harm, and difficult to repair, so that in the construction must be strengthened attention. The measures to address such problems are:
???? 1, in the tightening bolts, the mother should be tight along the thread, do not force the damage to the thread.
???? 2, disc steel used as a boom before, must require qualified new steel and cold drawn or straightened straight before use.
???? 3, the main, vice keel pendant and the big part of the deformation must be in the construction with steel wire clamp processing to meet the requirements of construction, not applicable or not with the accessories to be abandoned.
???? 4, hanging back keel, be sure to let the Lord, deputy keel close, pendant and the main keel connection, with a wire clamp clamp, let the connection no activity gap.
Hanging points and pendant nodes appear false force situation. The following are the same as the "
???? 1, hanging parts on the expansion of bolts and nuts and fixed hanging screw, nuts in the wire does not pay attention to lead to bolts and nuts kink, thread damage.
???? 2, the lower part of the expansion screw hanging hanging, the mouth is not fixed nut fixed.
???? 3, ? 6, ? 8 hanging in a lot of works, especially when the project ended, buy some steel bars, so that workers in the field straighten, when the hanging with.
???? 4, hanging with the main keel connection, due to large deformation or not supporting large, the main keel caught in the middle of the big crane, not in the bottom of the crane force.
???? 5, hanging in the main keel connection, under the hanging vice keel, and the main keel connection, leading to the main and vice keel between the active gap.
Gypsum board ceiling causes cracks
???? First, the fixed hanging bolt expansion bolt selected location is wrong
???? 1, the top plate to fight the fixed fountain line, the first to find the floor joints, the general construction of concrete construction here for the concrete irrigation, the first line on the use of this seam.
???? 2, hanging point spacing in the construction requirements of the requirements is 900-1200mm, the specific construction, the hanging point spacing can be within this range according to the floor width modulus to determine, so as to avoid the occurrence of lifting points, but also to avoid hammer Break the floor when punching prestressed tendons, affecting the floor force.
???? In case of a fixed point falls in the floor hole there are two ways to deal with: 1, in the appropriate space around the hole again. 2, with 50 × 50 iron thickness 3-4mm nut tightening spot welding.
