During the construction process, often encountered is the secondary grouting of dead anchor bolts, that is, when the foundation is irrigated, the reserved holes of the anchor bolts are left in advance on the foundation, and the anchor bolts are worn when the equipment is installed, and then Irrigation the anchor bolts with concrete or cement mortar. The following are the precautions for laying anchor bolts.
Before laying the anchor bolt, the rust and oil on the anchor bolt should be removed and cleaned, but the thread part should be coated with grease, and then check whether the fit with the nut is good. During the laying of the anchor bolt, prevent Debris falls into the bolt holes to ensure the quality of the grout.
When preparing to irrigate the hook anchor bolts for secondary irrigation, pay attention that the lower end hooks must not touch the bottom, and at least 100mm of clearance must be left, and the distance between the bolt and each side of the hole wall must not be less than 15mm.
If the gap is too small, it is not easy to fill up when grouting, and holes will appear in the concrete. If the equipment is installed in the basement or on the concrete floor, the hook end of the anchor bolt should be hooked to the steel bar; if there is no steel bar, a round steel should be used to cross the hook.
Note: Before pouring the concrete, the upper part of the bolt sleeve plate must be covered with a greased screw and nut with plastic cloth and tied with iron wire. When pouring concrete, especially when pumping concrete is adopted, it is necessary to prevent the concrete from being squeezed, which will cause the anchor bolts to move.
The concrete pump pipe should be prevented from pouring directly against the anchor bolts, and artificial cloth should be adopted within 30cm of the anchor bolts and the surrounding area. When using the vibrating rod, do not cause excessive vibration to cause damage. When pouring concrete, the construction personnel must strengthen the monitoring of the anchor bolts, and use a spirit level and theodolite to review the anchor bolts of each group at any time. Once deviations are found, they should be corrected immediately.
The above is an introduction to the precautions for laying anchor bolts. I hope that everyone will be helpful after understanding the precautions for laying anchor bolts.
