Do you know the process of installing acrow steel props? Below we will make a brief introduction on this.

1. Installation of supporting frame

1) Fabrication of Acrow Steel Props

The acrow steel prop frame is made of angle steel by tailor-welded. The two right angle side of acrow steel propping frame should perpendicular to each other and stable after welding. The phenomenon of twisted and cold solder joint should not appear.

2) Installation of Acrow Steel Props

After each layer of soil is excavated to the supporting position, the wall concrete should be excavated, and the elevation of the top surface of the acrow steel prop is calculated reversely according to the support centerline released by the measurement group. Then, the elevation is moved down to the design position, and two expansion bolts with a length of 220mmM20 are inserted to fix the acrow steel prop on the manual digging pile. The first acrow steel prop uses the channel steel embedded on the crown beam and the steel plate as the bracket.

2. Installation of steel enclosing purlin

1) Processing of steel enclosing purlin

Steel enclosing purlin is made of two i-steel welded with A3 steel plate. Weld the hanging basket at the corresponding supporting position according to the supporting distance. Steel enclosing purlin section processing, general section length of 2 ~ 3 support spacing. The corner part should be processed according to the actual length.

2) Assembly of steel enclosing purlin

Steel enclosing purlin shall be hoisted step by step in sequence with the support frame. Manual placing the steel enclosing purlin on the steel bracket in cooperation with the crane. After the steel enclosing purlin is installed, checking whether the steel bracket becomes loose due to impact. Then welding the gap between the supporting frame and the steel enclosing purlin with steel wedge. And fill the gap between the steel enclosing purlin and the enclosing structure with fine aggregate concrete to make the steel enclosing purlin under uniform stress.

3. The installation of acrow steel props

1) Splicing and assembly of acrow steel prop

Each acrow steel prop is configured according to the total length, one end is fixed and one end is movable, the middle section is the form of different standard pipe joints, and the connection between segments is the flange high-strength bolt connection. The acrow steel prop’s installation shall be spliced on the ground, and the installation shall use the loader to cooperate with the automobile crane. Acrow steel props should be hoisted at two points, and the lifting point should be about 0.2L from the end.

2) The pre-applied force of acrow steel prop

Acrow steel prop uses two 100t jacks to apply the pre-stressing force. According to the design requirements, the pre-applied force of the support is applied in different stages. The primary pre-applied force is not less than 40% of the design value, and then gradually increase the pre-applied force of support according to the design value of 20%.