1.3 three level disclosure system shall be implemented: 1) the technology department shall make scheme disclosure to relevant personnel of the project department and subcontracting technicians.
Solution: all materials used in high formwork area, including steel pipe, fastener, jacking wire, base, scaffold board, formwork, timber and other materials, must be accepted at the site, and joint acceptance shall be carried out according to the scheme standards.
The on-site technicians and operators do not grasp the scheme well.
Solution: during the construction of high formwork, the construction technicians must conduct on-site supervision, correct the errors in time, and ensure that the acceptance is passed at one time after the construction is completed.
1.2.
The pouring part is two-story structural beam and slab, with an elevation of + 9.55m, The elevation of the bottom foundation beam is -0.6m and the total height is 10.15m.
The materials used cannot meet the requirements of the scheme, resulting in potential safety hazards.
The equipment shall be tested and adjusted before formal use, And timely maintenance and repair.
2.1-1 structural drawing of pole foundation on the ground adopts fastener type steel pipe support system, and beam, slab and column are not shared.
1.2 operators must carry out three-level safety education and corresponding assessment before entering the site.
2.
There are many surface layers and types of components in the high formwork area.
From | northeast industrial big data center project and Chapter I project overview of China Construction Second Engineering Bureau 1.1 overview and characteristics of high formwork project.
The construction scheme must be implemented after being demonstrated by experts.
Fig.
2.
1.4.
4.
1.2.
1.4.
Technical requirements for materials: fastener steel pipe, fastener, adjustable U-shaped bracket, wooden square, multilayer board, scaffold board, electric wrench, woodworking circular saw, woodworking planer, pressure planer, portable electric saw, portable pressure planer, drilling electric drill, plumb bob, guiding rule board, square ruler, iron level, crowbar and other materials, equipment and machines are prepared in place.
3) The subcontractor foreman shall make technical disclosure and safety disclosure of subdivisional works to the team.
The high formwork support system and the columns poured around shall be clamped and tensioned, the vertical poles under the beam and slab shall be in vertical and horizontal rows, a row of longitudinal vertical poles shall be set under the large section beam, a row of longitudinal vertical poles shall be set under the small section beam, and all the horizontal horizontal horizontal poles shall be connected; All the horizontal rods of the support system under the slab extend under the beam and are connected with the vertical rod or horizontal rod under the beam to ensure the overall stability of the support system.
2.
During the construction of high formwork, the reinforcement processing shed and woodworking shed are set in the south of the construction area, and the temporary roads for the operation of automobile pumps and tank trucks are set around.
At the beginning of each month, they shall participate in the safety training organized by the management department together with the project construction personnel and the management personnel of the project management department.
2) The engineering department shall make disclosure to the subcontractor foreman and team leader.
1.2 analysis of key points and difficulties in high formwork construction and Countermeasures 1.2 1.
1.4.
Solution: after the scheme demonstration is completed, the detailed scheme disclosure shall be made to the technicians first, and the intuitive, simple and clear technical disclosure shall be made to the operators.
1.3 the a2# building is located in the northeast corner of the site and adjacent to Baita 2nd South Street in the East.
The first-class box is equipped in the northwest corner of a2# building to meet the reasonable power consumption of tower crane, processing area and construction process, Water pipelines are set around the site to meet the needs of formwork wetting and concrete curing.
Solution: the preparation of the construction scheme must be comprehensive and detailed, and the checking calculation must be accurate.
Double sided plywood 13mm thick (calculated as 12mm) + wood brace secondary ridge 50mm × 80mm (calculated as 45) × 75), beam bottom ≤ 100mm, beam bond ≤ 200mm, plate bottom spacing ≤ 200mm + double steel pipes are used for the main beams under the plate and on the beam side φ forty-eight × 3.
The high formwork support system falls on the 100mm thick C15 concrete cushion.
After passing the assessment, they can go on duty with qualification certificates.
Figure 1.3-1 construction layout 1.4 construction requirements and technical assurance measures 1.4 1.4 technical management requirements 1.1 be familiar with the construction drawings, organize the project personnel to carefully study the relevant specifications, procedures or regulations, and the technology department shall prepare a practical construction scheme, which shall be based on in the construction process.
The row spacing of vertical and horizontal poles is 875mm, the step spacing is 1500mm, the longitudinal spacing of vertical poles at the bottom of the beam is 875mm along the beam, and the spacing between vertical poles on both sides of the beam and the edge of the beam is 200mm.
The single high formwork involved in the project is a2# building, which is located in the middle area surrounded by arc stairs from axis 2-2m to axis 3 + 2m / d-2m to axis f + 2m, as shown in the following figure: figure 1.1-1 schematic diagram of high formwork construction area.
The construction was not carried out according to the disclosure during the construction, and the acceptance could not meet the construction requirements.
The main ridge under the beam is double timber square 50mm × 80mm (calculated as 45) × 75) + adjustable U-bracket + full frame steel pipe support system, the top screw extends no more than 200mm from the top of the steel pipe, the free end of the upright rod is no more than 400mm, a sweeping rod is set 200mm high from the ground, the bottom end of the upright rod is fully paved with springboard, and double upright rods are set under the beam, with a support spacing of 300mm with the beam width.
3.
See the following figure for the dimensions of beam and slab members in the high formwork area: figure 1.1-2 dimensions of the high formwork pouring area.
3) The roof elevation control line has been set out, and the vertical pole position line has been snapped on the ground; 4) Detailed technical disclosure of erection safety has been carried out..
Chapter II construction technology 2.1 technical parameters 2.1 1 technical parameters of support system design the backfill of the project shall meet the strength requirements of 120kPa, and 100 thick C15 concrete cushion shall be poured in the high formwork area.
The compaction coefficient of the bottom backfill is required to meet the requirements of the drawing, and the backfill is compacted in layers with a bearing capacity of more than 120kPa.
1.2.
Support structure parameters item No.: (specific measures 1) erection conditions of frame 1) backfill around a2# foundation beam and room core shall be backfilled and compacted in layers and meet 120kPa; 2) Foundation 100 thick C15 cushion strength ≥ 1.2MPa.
They can be used only after passing the acceptance.
2.1.
