The installation sequence, calibration and positioning of precast components and temporary fixing measures are the key to the construction of cast structures, which shall be implemented in strict accordance with the scheme; 4.

6.

Strictly control the waterproof construction quality of exterior wall panel joints, and carry out pressure water pouring test for no less than 2H..

The lower part of each laminated slab shall be close to the lifting ring along the long direction of the precast slab, and full-length skids shall be placed, aligned, leveled and padded up and down.

Before the production of precast components, the reinforcement sleeve connection joint shall be inspected, including appearance quality, dimensional deviation, material report provided by the factory, joint type inspection report, etc.

Key points of quality control 1.

Deepen the design of precast components, carry out detailed design and construction checking calculation, improve the fabrication details and construction assembly details of precast components, and avoid errors, omissions, collisions, deficiencies and other problems in the process of component processing and construction; The reserved holes and embedded parts shall be carefully checked before processing to avoid chiseling on site.

Inspect the concealed works of prestressed tendons and various embedded parts; 3.

The size of section steel mold must be made and processed accurately according to the size of various components; 2.

During the acceptance of the inspection batch, if the joint quality is defective, a third-party independent testing organization can be entrusted to carry out non-destructive testing; 3.

Sort out | cast construction process in section I of diced bean construction | 1.

The support removal or superstructure installation can be carried out only after the curing test block under the same conditions at the joint reaches the design strength.

Wire Lifting Loop

Concrete pouring after the precast wallboard is installed in place, the concrete of the wall column shall be poured first, and then the beam slab concrete shall be poured.

The joint connection between PC component and cast-in-place structure shall be connected with reinforcement according to the scheme requirements.

Acceptance of precast components ― after the components enter the site, they shall be accepted one by one, including appearance quality, geometric dimension, embedded parts, reserved holes, etc.

3.

Concrete pouring 1.

Heat and cure the concrete with steam.

The stacking height shall not be greater than 5 floors, the stacking height of precast stairs shall not be greater than 2 floors, and the lower part of the component shall be padded with wood 100mm away from the vehicle body.

Refer to the key points of picture quality control.

5.

Component identification ― carry out dimensional measurement and strength inspection for precast components, and independently number and identify each component according to the building, floor and position.

6.

Section III installation and construction process of precast laminated plates # 1.

Two full-length skids are placed under each plate.

if they are found to be unqualified, they shall be removed from the site; Check the identification of precast components, including laminated plate number, simplified hoisting number and installation direction.

in addition, the reinforcement sleeve grouting connection joint test piece shall be made according to the requirements for confirmatory test; 2.

Control the installation sequence, calibration and positioning and temporary fixing measures of precast components in strict accordance with the scheme; 2.

After the components are formed, they must be numbered independently according to the use requirements to avoid hoisting errors.

as non structural components, PC exterior wall panel components are “coats” attached to the main structure and elastically connected with the main structure according to the side connection.

It shall be connected with the main structure through the reserved reinforcement on the PC board.

4.

The precast concrete PC outer wall plate can be used as the outer formwork of the shear wall and connected with the inner cast-in-place reinforced concrete structure.

5.

Key points of quality control # 1.

Overlapping stacking of plate numbers of different specifications is not allowed.

The site shall be leveled and hardened, marked with warning signs and standardized management; The components are stacked according to models and specifications.

Check and accept the concealed reinforcement before pouring, calibrate the components, and reinforce and correct the support connection.

Hoisting of laminated plate # hoist and place the laminated plate according to the snapped control line.

Preparation before hoisting # check the setting of elevation, axis, component displacement, support installation, embedded ring, etc.

4.

6.

7.

2.

Finish the surface with steel trowel and brush; 3.

Transportation of precast components # in order to prevent damage and overturning of components during transportation, special fixed supports for vehicle transportation stability shall be set.

Pour concrete with concrete feeder and tamp with high-frequency vibrator; 2.

Section II production and construction process of precast components # 1 formwork assembly # assembly and connection of profile steel formwork made according to the form of precast components; 2 reinforcement binding # binding and processing of reinforcement according to the form of components and welding reinforcement # 3 reinforcement into the formwork # placing the reinforcement in the formwork and fixing it in place # 4 concealed inspection # inspection of prestressed reinforcement, later parts, reserved holes Installation of embedded parts 5.

The size of prestressed reinforcement, embedded parts and reserved holes must be accurately positioned according to the requirements of the drawing, and installed and fixed firmly; 3.

The post cast concrete joint of cast structure is the key to ensure the bearing capacity.

1.

Strictly control the quality of the sleeve grouting connection joint.

Storage of precast components in the layout of the construction site, the storage site of precast components shall be considered, and the scope of the storage site of components shall be marked out at the construction site.

The installation and splicing shall be properly adjusted according to the displacement of the cast-in-place components.

The reinforcement connection and anchorage at the joint must be checked according to the design requirements.

The skids are placed close to the lifting ring along the long direction of the laminated plate, and are aligned, aligned, leveled and padded up and down.

2 production of precast components precast components usually include exterior wall panels, bay windows, balconies, stairs, air conditioning panels, laminated plates, laminated beams and columns, etc.

The inspection requirements for cast-in-situ concrete of cast structure shall be in accordance with the current code for acceptance of construction quality of concrete structure engineering; 4.

Erection of formwork support system # the support system shall be erected according to the requirements of the scheme.

The stacking height shall not be greater than 5 layers; The lower part of the component shall be padded with wood, 100mm above the ground; The stress point of the stair is the same as the lifting point of the beam.

3.

Hoisting of precast components ＾ carry out elevation re measurement, positioning and snapping line, then hoist the precast components in place, and correct and reinforce ＾ after the construction of 7pc main structure ＾ after the hoisting and acceptance of precast components, and ensure the stability of diagonal bracing, foot code and component connectors, carry out the next steel bar binding and formwork closing process, and pour the concrete of wall and floor slab as soon as possible according to the construction cycle, Form a whole structure and record the installation time of each component.