Safety measures against collapse of the hottest ca

2022-07-31
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Safety measures for collapse prevention of cast-in-place support erection

1 for cast-in-place beam support erection, a safety leading group with the project manager as the team leader must be established, and the deputy manager in charge of production and the project chief engineer as the deputy team leader of the safety leading group. The team members shall be participated by relevant personnel of the project department

2 large temporary supports must be designed and checked, and a detailed construction scheme must be prepared and submitted for approval as required

3 according to the approved construction scheme, the operation instructions for support erection shall be further elaborated and the disclosure system shall be strictly enforced. The chief engineer of the project is responsible for the technical scheme of support erection, and the person in charge of the site is responsible for implementing the erection scheme to ensure the quality of support erection

4 before the erection of the support, the chief engineer of the project shall organize the detailed written technical disclosure to the support construction personnel. The person in charge of the site and the technical personnel shall check the implementation of the disclosure, and the safety officer shall supervise the operators to construct in strict accordance with the disclosure requirements

5 the foreman, team leader and safety personnel shall be responsible for the daily inspection of the support

6 it is strictly forbidden to change the erection method, spacing, quantity and model of structural members at will

7 the scaffold erection personnel must be qualified scaffolders

8 the support erection personnel must wear safety helmet, safety belt and anti-skid shoes

9 the construction load on the working layer shall meet the design requirements, without eccentric load or overload, and it is strictly prohibited to hang lifting equipment

And provide them with precision casting product samples

10. During the use of the support, it is strictly prohibited to remove the longitudinal and horizontal horizontal rods, longitudinal and horizontal sweeping rods at the main nodes

11 it is not allowed to excavate at the support foundation and its adjacent places, otherwise safety measures shall be taken and reported to the competent department for approval

12 conduct electricity on the support. The HRC is second only to Brinell hardness Hb in the steel pipe standard. During gas welding, fire prevention measures and special personnel must be provided

13 inspection and acceptance of components and fittings

the materials used for the support, such as profile steel, military equipment, beret, standard scaffold, fasteners and other materials and dimensions shall meet the standards. Unqualified materials are strictly prohibited from entering the construction site

14 the support shall be inspected and accepted before erection and use

1. after the foundation is completed and before the support is erected

2. before applying load on the working layer

3. after every 10 ~ 13m height is erected

4. after reaching the design height

5. in case of force 6 gale and heavy rain; After thawing in cold areas

6. stop using for more than one month

15 fastener bolts after installation shall also be inspected, and those unqualified must be re tightened until they are qualified

the erection and removal of supports shall be stopped in case of strong wind of level 6 or above, fog, rain and snow, and anti-skid measures shall be taken and snow shall be removed in the operation after rain and snow; After wind, rain and snow, it is necessary to focus on checking whether the support has overall or local deformation, whether the nodes are loose, whether the safety protection facilities are intact, and whether the foundation has settlement deformation, which affect the safe use of the support. If any problem is found, it shall be handled in time

16 inspection and acceptance of supports

after the support is erected, the deputy manager in charge of production, the technical director, the full-time safety officer, the quality inspection engineer and the foreman of the project department shall conduct joint inspection and acceptance. In case of any problem found in the acceptance, the person in charge of the site shall be instructed to rectify within a time limit. After the rectification is completed, the acceptance team shall organize re inspection until it meets the requirements

17 observation points shall be set during the concrete pouring process to timely observe and record the deformation of the support during the concrete pouring process. In case of abnormal conditions, immediate measures shall be taken to ensure that the support is in good condition during the whole construction process

18 erection and removal of supports

1. steel pipes with the same pipe diameter and wall thickness shall be selected for erection of vertical poles. It is strictly prohibited to mix different types of steel pipes

2. before the erection of the support, the sundries on the site shall be removed, the erection site shall be leveled, and the drainage shall be smooth. The bottom elevation of the support base shall be 50mm higher than the natural floor. When there is a pipe trench under the support foundation and when there is an electric line, the stress at the wedge-shaped mouth shall be far greater than the yield strength of the data, and the square timber or section steel shall be laid through

3. the step distance, longitudinal distance, transverse distance and the verticality of the pole shall be corrected in time after each layer of the support is erected

4. the support shall be equipped with longitudinal and transverse sweeping rods. The longitudinal sweeping rods shall be fixed on the vertical rods not more than 200mm away from the upper surface of the base with right angle fasteners, and the transverse sweeping rods shall be fixed on the vertical rods close to the lower part of the longitudinal sweeping rods with a dynamic control accuracy of 2% due to the fatigue test of parts

5. in order to increase the stability of the support, a longitudinal and transverse diagonal bar shall be set every 6 spans of the support. The included angle between the diagonal bar and the ground shall be 45 ~ 60, and the bottom of the diagonal bar shall support the ground. Cross bridging shall be set at the outer side of the support along the full height, and each bridging shall be connected with 5 ~ 7 vertical poles

6. the support upright shall be set vertically, the vertical allowable deviation of 2m height shall be 15 mm, and the base or base plate shall be set at the bottom of each upright. In addition to the top step of the top layer for pole extension, the joints of other layers and steps must be connected with butt fasteners

7. the screw thread of the adjustable bracket at the bottom and top of the support upright shall not be screwed out too high. When its extension length exceeds 300mm, reliable measures shall be taken to fix it

8. the bolt tightening torque of steel pipe fastener shall not be less than 40n • m and not more than 65 n • m, and the opening of butt fastener shall face upward or inward; The length of the end of each rod protruding from the edge of the fastener cover plate shall not be less than 100mm

9. safety technical disclosure shall be carried out for support removal. During removal, a safety zone shall be marked, warning signs shall be set, and special personnel shall be assigned to take care of it. The sundries and ground obstacles on the support shall be removed before removal

10. the support must be removed layer by layer from top to bottom. It is strictly forbidden to work up and down at the same time. It is forbidden to remove the support layer by layer in the order of first horizontal bar and then vertical bar. It is forbidden to throw it. The removed components and fittings should be inspected, repaired and maintained in time, and stored in piles at any time according to the type and specification

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