Force measurement apparatus for pile

A force measurement apparatus, adapted to sense a radial deformation of the pile, comprising:

• at least one pressing ring comprising:
• a ring body with at least one end and an inner surface, wherein the ring body surrounds an axis passing through a centroid of the ring body, the inner surface faces the pile;
• and
• at least one pressing part disposed at the at least one end;
• and
• at least one force sensor comprising:
• a connection part connected to the inner surface of the ring body;
• a contact part with a convex surface facing the pile, wherein the contact part is connected with the connection part to forms a space, the at least one pressing part is capable of pressing the ring body such that the convex surface contacts the pile to fix the at least one force sensor on the pile;
• and
• a force sensing element disposed in the space to sense the radial deformation of the pile.

A force measurement apparatus, adapted to sense a radial deformation of a pile, comprising:

• at least one pressing ring comprising:
• two arc-shaped structures, wherein the two arc-shaped structures surround an axis passing through a centroid of the two arc-shaped structures, each of the two arc-shaped structures has two ends and an inner surface facing the pile;
• and
• a plurality of pressing parts, wherein each of the plurality of the pressing parts is connected with the corresponding one of the two ends;
• and
• at least one force sensors comprising:
• a connection part connected to the inner surface of one of the two arc-shaped structures;
• a contact part having a convex surface facing the pile, wherein the contact part is connected with the connection part to form a space, a radial stiffness of the contact part is smaller than a radial stiffness of each of the arc-shaped structures;
• and
• a force sensing element disposed in the space,
• wherein a plurality of the pressing parts is capable of pressing the two arc-shaped structures such that the convex surface of the contact part contacts the pile to fix the force sensor on the pile for sensing the radial deformation of the pile, a region where the convex surface of the contact part contacts the pile is a plane or a line.