What are Foundation Unchor Bolts? How do I install them?

Foundation Unchor Bolts are usually positioned and fixed before the equipment foundation is poured, and form a stable connection with the foundation after pouring. There are also holes reserved when pouring the foundation, and the holes are poured after the equipment is in place, installed, leveled and aligned. Small equipment also has Drill holes in the foundation and fix with expansion bolts. Now, Handan Wangxuan Fastener Manufacturing Co., Ltd will introduce to you: the installation method of Foundation Unchor Bolts.

Installation of Foundation Unchor Bolts

1. Foundation Unchor Bolts Verticality

Foundation Unchor Bolts should be installed vertically without tilt. If the installation is not vertical, the installation coordinates of the bolts will inevitably produce errors, causing certain difficulties in the installation. If the base of the bolt hole is very thick, it may even be impossible to install. Because the bolt is not vertical, its ability to withstand external forces is reduced.

Sometimes, the installed equipment may change its position due to the effect of this component force before the second grouting, causing rework or quality accidents. At the same time, due to the existence of horizontal force, once encountering external force, it is possible to cause errors in the aligned equipment, which is not allowed. Therefore, when installing Foundation Unchor Bolts, be sure to install them vertically to avoid tilting.

2. Laying of Foundation Unchor Bolts

①During the construction process, secondary grouting of bolts is often encountered, that is, when pouring the foundation, reserved holes for bolts are reserved on the foundation in advance, and bolts are inserted when installing the equipment, and then concrete or cement mortar is used to grout the bolts. Grout the bolts tightly.

② Before laying Foundation Unchor Bolts, the rust, oil, etc. on the bolts should be cleaned, but the threaded part should be greased, and then check whether the fit with the nut is good. During the laying of the bolts, prevent debris from falling into the The bolt hole should be filled with stainless steel to ensure the quality of grouting. When preparing for secondary pouring of the hook-type bolt, care should be taken that the lower end of the hook does not touch the bottom, and a gap of at least 100 mm should be left. The distance from the bolt to each side of the hole wall cannot be less than 15 mm. If the gap is too small, it will be difficult to fill when grouting, and holes will appear in the concrete. If the equipment is installed on a concrete floor in a basement or foundation, the hook end of the bolt should be hooked on the steel bar; if there is no steel bar, a round steel should be passed across the hook.

3. Tighten

The bolts can only be tightened when the concrete in the reserved hole reaches more than 75% of its design strength. The tightening force of each bolt should be uniform. After tightening, the bolt should be exposed from the nut, and the exposed length should be 1/3 to 1/2 of the bolt diameter. 2/3.

4. Keep corresponding construction records

During the installation process, detailed construction records should be kept to truly reflect the model, specifications, etc. of the bolts, so as to provide effective technical information for future maintenance and replacement. Precautions when pouring concrete: Before pouring concrete, the screws and nuts on the upper part of the bolt sleeve must be greased with butter, wrapped with plastic cloth and tied tightly with wire. When pouring concrete, especially when using pumped concrete, it is necessary to avoid squeezing of the concrete, which may cause the bolts to move out of place. Concrete pump pipes should avoid being poured directly against the bolts, and artificial laying should be adopted within the Foundation Unchor Bolts and within 30cm around them as much as possible. When using a vibrator, do not vibrate too frequently in the above areas. When pouring concrete, construction workers must strengthen the monitoring of Foundation Unchor Bolts and use levels and theodolites to review each group of bolts (especially the bolts around which concrete is being poured) at any time. Once deviations are detected, corrections should be made immediately.