Abstract: An apparatus for raising concrete members and maintaining the members in a raised position. The apparatus may be utilized for raising or leveling flat slabs such as sidewalk sections, driveways and patios or for raising sunken sections of curbs and gutters, and the apparatus includes a portable mud pump and mixing tank to provide grout or mud under the raised members for maintaining same in the raised position. A method for raising the members is carried out by attaching the sunken member to an apparatus including one or more lifting jacks, raising the member by the jacks, and at least partially filling the cavity under the member with a grout or mud. The portable mud pump, which includes a limit switch controlled double-acting air driven piston, is connected to a mud or grout mixing tank via a check valve and withdraws mud from the tank during an intake stroke and forces the mud, during a power or output stroke, into a cavity under a raised concrete member.

Abstract: An apparatus for raising concrete members and maintaining the members in a raised position. The apparatus may be utilized for raising or leveling flat slabs such as sidewalk sections, driveways and patios or for raising sunken sections of curbs and gutters, and the apparatus includes a portable mud pump and mixing tank to provide grout or mud under the raised members for maintaining same in the raised position. A method for raising the members is carried out by attaching the sunken member to an apparatus including one or more lifting jacks, raising the member by the jacks, and at least partially filling the cavity under the member with a grout or mud. The portable mud pump, which includes a limit switch controlled double-acting air driven piston, is connected to a mud or grout mixing tank via a check valve and withdraws mud from the tank during an intake stroke and forces the mud, during a power or output stroke, into a cavity under a raised concrete member.

Abstract: A method and apparatus for raising concrete members and maintaining the members in a raised position. The method and apparatus may be utilized for raising or leveling flat slabs such as sidewalk sections, driveways and patios or for raising sunken sections of curbs and gutters, and the apparatus includes a portable mud pump to provide grout or mud under the raised members for maintaining same in the raised position. The method is carried out by attaching the sunken member to an apparatus including one or more lifting jacks, raising the member by the jacks, and at least partially filling the cavity under the member with a grout or mud. The portable mud pump, which includes a limit switch controlled double-acting air driven piston, is connected to a mud or grout supply (tank) having a check valve, and withdraws mud from the tank during an intake stroke and forces the mud, during a power or output stroke, into a cavity under a raised concrete member.