An apparatus for raising concrete members and maintaining the members in a raised position. At least one of the properties of the operating element changes when coming in contact with a liquid so that the opening can be exposed by the closure element after cooperation of the operating element with the closure element. The information is used to make a decision about the transmission of the frames, such as the order for sending the frames or whether or not to send a frame. The side arms have hinges for folding the arms relative to a support member.