Construction and calculation of support system

Set up two cross bridging. The vertical pole of the full hall support shall be vertical, and the horizontal and vertical lines shall be formed, so it shall be connected in the vertical and horizontal directions

Long snap line as a reference. Each layer of cross bar shall be horizontal and on the same horizontal plane. The formwork support and bowl buckle support system are fixed with steel pipe clips. Each steel pipe shall be locked with at least three vertical poles.

Removal of formwork

For the column formwork, the inclined support of the middle column shall be removed first, and then the central column purlin and split bolt shall be removed. For the pre assembled column formwork,

Temporary support shall be set, and then the formwork shall be gently pried with a crowbar from top to bottom to separate the formwork from the concrete.

The wall formwork shall be hung with the hook first, then the diagonal brace shall be removed, and then the formwork shall be gently pried with a crowbar to make the formwork leave the body,

After checking that all connectors are removed, the formwork can be lifted away.

For beam and roof formwork, first remove the beam side formwork, then the roof bottom formwork, and finally the beam bottom formwork. For beam and roof support, first remove the horizontal bar, and then remove the formwork support. Quality standard and quality assurance measures of formwork

Construction precautions

a. Column formwork is prone to problems, mainly including inaccurate section size, too large concrete protective layer and distortion of column body.

The prevention method is to snap the position line according to the drawing before formwork erection and correct the position of reinforcement. Before formwork erection, a small square plate (square column) shall be made at the bottom of the column, and the four corners of the column shall be pulled and supported.

b. Surface bonding of concrete wall: it is caused by poor formwork cleaning, uneven application of isolating agent and premature formwork removal

Yes. The formwork shall be cleaned, and the formwork removal time and strength shall be strictly controlled.

c. The plywood covered with formwork shall be transported and stacked to prevent rain and water immersion; It is strictly forbidden to collide with hard objects, knock with crowbars, drag the reinforcement on the, vibrate with vibrators, throw at will and other phenomena for the formwork covered multilayer board, so as to ensure that the formwork covered on the board surface is not damaged; The side of the formwork after cutting or drilling shall be painted with edge sealing paint to prevent the delamination and deformation of the coated multilayer board after water immersion; After use, the formwork of multi-layer board covered with formwork shall be cleaned with detergent in time. It is strictly prohibited to knock and scrape the board surface and the external corner of cut square wood with hard objects; The formwork of the operating surface shall be repaired in time. When the board surface has scratches, bumps or other minor defects, it shall be embedded and polished with special putty, and brushed with bd-01 epoxy wood mold protective agent.

d. The release agent used is water-soluble release agent.

Finished product protection measures

① In the process of formwork support and removal, keep away from the formed wall as far as possible, and strictly prevent the formwork from colliding with the formed finished reinforcement.

② Before formwork removal, ensure that the structural strength has reached the formwork removal strength. The formwork removal strength is based on the same conditions as the structure

③ When it is difficult to remove the formwork, the crowbar can be used to pry from the bottom of the formwork with square wood as the fulcrum. It is strictly prohibited to pry the formwork with the newly formed structure as the fulcrum.

④ During formwork removal, the wall formwork shall be strictly prevented from being damaged.

⑤ The formwork shall be lifted and placed with care, and it is not allowed to collide with the installed formwork and other hard objects; When the formwork is hoisted in place, it shall be balanced and accurate, and the reinforcement shall not be hung.

⑥ Strictly control the formwork removal time, which shall be determined according to the strength of the test block cured under the same conditions.

⑦ The formwork removal shall be carried out according to the procedure. It is forbidden to knock with a sledge hammer or hard sledge with a sled to avoid damaging the concrete surface and edges and corners.

4. Construction arrangement

The formwork project involves several links, such as material planning, on-site material preparation, formwork configuration and storage, formwork hoisting, formwork removal and storage. All links shall be reasonably arranged in combination with the progress of reinforcement works.

Formwork hoisting shall be carried out according to the scheme to ensure the safety of formwork and site personnel.

The increase of concrete strength shall be considered for formwork removal, and test blocks under the same conditions shall be reserved on site to provide basis for formwork removal. The demolition shall be carried out in strict accordance with the scheme to ensure safety and reduce formwork damage. After removal, it shall be stored according to the scheme.