【Daily Question】Utilities - Mechanical & Electrical - 20191207

Thread Content

According to the General Specifications for the Construction and Acceptance of Mechanical Equipment Installation Projects, which of the following statements regarding anchor bolts, shims, and grouting are correct? ( )    A. Before installing the foot bolts, any debris present in the pre-drilled holes must be removed. The surface of the foot bolts should be cleaned of oil and oxidation layers, and the threaded parts should be coated with plenty of grease as well as bolt protectors.
B. The type, quantity, diameter, and specifications of the foot bolts must be checked in accordance with the documents provided; only after verification can the bolts be installed.
C. When installing bolts in the pre-drilled holes, the concrete in those holes must have reached at least 60% of its designed strength before the bolts can be tightened.
D. The documentation provided by the construction party regarding the shims used must be reviewed in line with the design documents or the equipment’s accompanying technical specifications. This includes checking the material, quantity, and type of the shims; installation is allowed only after everything is confirmed to be correct.
E. Before grouting the pre-drilled holes, the areas to be grouted must be thoroughly cleaned ； Grouting should be done using fine aggregate concrete, whose strength should be one grade higher than that of the concrete used for the foundation or floor ； During grouting, it should be compacted, and the anchor bolts must not be tilted, as this could affect the installation accuracy of the equipment. Answer: ABDE