| 摘要 |
FIELD: physics. ^ SUBSTANCE: slab is placed on four symmetrically arranged supports. A load is applied to the slab at the centre between support points and sagging is determined by measuring displacement of the points of the slab. The plane passing through the support points of the slab is taken as the base. Displacement of points of the slab relative the base plane passing through three points on the top surface of the slab is measured, two of which lie over support points of the slab on one side, with the third point lying on the slab over the point at the middle of the line segment joining the remaining two support points of the slab. Sagging in points of the slab relative the base is determined using a formula. The device has display instruments, a truss made from an angle piece and fitted with three cone-shaped bearing elements which are rigidly attached to the truss and lying in the same plane. The distance between the bearing elements is equal to the distance between two support points of the slab on one of its sides. The third bearing element is fitted on the truss equidistant from the first two bearing elements and at a distance from the line joining the first two bearing elements which is equal to the distance from the line joining support points of the slab on one side to the line joining two support points on the other side. The truss is fitted on the slab such that two bearing elements are fitted on the slab over support points of the slab on one side, and the third element is fitted on the slab over the point lying at the middle of the line segment joining the remaining two support points of the slab on the other side. The housing of the display instruments is mounted on the truss, where two of them are fitted over support points of the slab on the side of one support point of the truss, and one is fitted over the point lying at the middle between two support points of the truss, which coincide with support points of the slab on the opposite side. ^ EFFECT: more accurate measurement of sagging of a slab. ^ 2 cl, 4 dwg |
