Mich. Admin. Code R. 408.42524

Current through Vol. 24-21, December 1, 2024

Section R. 408.42524 - Vertical shoring generally

Rule 2524.

(1) When temporary storage of reinforcing rods, material, or equipment on top of formwork becomes necessary, these areas shall be strengthened to support the intended loads.

(2) The sills for shoring shall be sound, rigid, and capable of carrying the maximum intended load.

(3) When shoring from soil, the soil shall be capable of supporting the load and the soil shall be inspected after each occurrence which could affect its load-bearing capacity. Soil weakened from any occurrence that reduces its load-bearing capacity to less than that required to support a specific load shall be strengthened by compacting or other equivalent means.

(4) Baseplates, shore heads, extension devices, and adjustment screws shall be in firm contact with the footing sill and the form.

(5) Eccentric loads on shore heads and similar members or shoring are prohibited, unless the shore heads are designed for the loading.

(6) Shoring equipment shall be inspected by a qualified person before erection to determine that it is as specified in the shoring drawings or plans. Any equipment found to be damaged shall not be used for shoring.

(7) Before concrete is placed in the forms, all shoring equipment shall be inspected by a qualified person to determine whether it was erected as specified in the shoring drawings or plans.

(8) Erected shoring shall be inspected by a qualified person during and immediately after pouring concrete. Shoring that is found to be damaged or weakened shall be reinforced or reshored.

(9) Only designated employees shall be permitted on the first floor immediately under the forms during concrete placing work.

(10) Shoring equipment shall not be released or removed without the approval and assurance of a qualified person that the remaining equipment will support the load.

(11) Construction or superimposed loads shall not be placed on an uncured concrete pour unless either of the following provisions is complied with:

(a) The strength of the concrete in the previous pour has been determined by testing to be capable of withstanding the load.

(b) A qualified person indicates that the concrete has developed sufficient strength to support the load. This subrule does not apply to slip form operations and slabs built at grade elevation.

(12) Reshoring shall be provided, when necessary, to support slabs and beams after stripping or where the members are subjected to superimposed loads due to the construction work done.

(13) Vertical shoring shall not be adjusted to raise formwork after concrete is in place, unless specifically provided for in the design specifications.

Mich. Admin. Code R. 408.42524

1980 AACS; 1989 AACS; 2013 AACS