Before the grouting of reinforcement sleeve connection, the grouting method of component connection joints shall be simulated on site.
2.
Brand, specification, quantity, position and spacing of reinforcement, bending angle of rebar planting hook and length of straight section; 3.
√ before grouting, check whether there are sundries in the grouting hole and grout outlet hole of each joint one by one to ensure that the hole path is unblocked; √ the grouting slurry shall be poured within 20min and 30min from the beginning of mixing with water; √ the same silo can only be grouted in one grouting hole, and more than two grouting holes cannot be selected at the same time; √ grouting shall be carried out continuously in the same warehouse without stopping halfway.
Diagonal brace setting: √ the horizontal included angle between the diagonal brace and the floor shall not be less than 60 °; √ for prefabricated shear wall components, there should be no less than 2 diagonal supports, and each diagonal support consists of upper long diagonal support rod and lower short diagonal support rod; √ the distance between the support point of the upper inclined support and the plate bottom should not be less than 2 / 3 of the plate height, and should not be less than 1 / 2 of the plate height.
Construction process of sleeve grouting connection: separate grouting joints → block the outer edge of component joints → prepare grouting material → grouting material inspection → pressure grouting → block grouting and discharge holes → joint filling inspection.
The sling shall be configured according to the shape, size, weight and other parameters of prefabricated components.
Specification, quantity and location of embedded parts and reserved pipelines.
Connection of prefabricated shear wall joints: √ the horizontal connection joints of prefabricated shear wall are divided into one-dimensional connection, L-shaped connection and T-shaped connection; √ set cast-in-situ joints at the horizontal connection of precast shear wall according to the design drawings to form a rigid connection; √ the connection of longitudinal reinforcement at cast-in-situ joints shall be in a form suitable for the binding of joint reinforcement; √ when the reserved reinforcement of the shear wall and the additional connecting reinforcement of the joint are in the form of closed reinforcement, class I joints should be used to connect the longitudinal reinforcement of the joint.
Attention shall be paid to the connection construction of post cast concrete: √ the concrete at the loose part of the joint surface of prefabricated components shall be removed and cleaned; √ the formwork shall ensure that the shape, size and position of the post cast concrete part are accurate, and shall prevent slurry leakage; √ when the strength grade of precast beam and column concrete is different, the concrete in the beam column joint area shall be poured according to the high strength grade; √ the concrete at the connection node and connection joint of prefabricated components shall be vibrated at dense points and the vibration time shall be extended appropriately..
3.
√ the tensioning method shall be specified in the design drawing.
The lifting appliance for hoisting shall be designed, checked or tested according to the provisions of relevant current national standards.
The horizontal included angle of the sling shall not be less than 60 ° and not less than 45 °; For prefabricated members with large size or complex shape, spreaders with distribution beams or distribution trusses should be used.
Correction of prefabricated shear wall and column: √ check the verticality of prefabricated shear wall and column with 2m guiding rule and plumb bob according to the installation control line and elevation line of prefabricated shear wall and column, and fine tune the verticality of prefabricated shear wall and column through adjustable inclined support; √ precast shear walls and columns shall be corrected simultaneously during installation and construction; √ after the perpendicularity of vertical members meets the requirements of design and relevant specifications, all inclined supports shall be fixed in time.
Connection mode, joint position, number of joints, percentage of joint area, overlapping length, anchorage mode and anchorage length of reinforcement; 4.
For large nodes, it should be divided into initial tightening, re tightening and final tightening; √ in order to make all bolts in the bolt group bear stress evenly, the bolts at the connection shall be screwed in a certain order; √ the initial tightening, re tightening and final tightening of high-strength bolts shall be completed within 24 hours; √ when the temperature is lower than – 10 ℃ and in rainy and snowy weather, the operation of high-strength bolts working in the open air shall be stopped.
Before the construction of the project, the construction site should be well prepared for “three supplies and one leveling” (i.e.
No less than 3 sets of simple grouting joints shall be made for each specification of reinforcement to inspect the grouting quality and tensile strength; Grouting operation can be carried out only after each type is inspected to be qualified.
1.
If there are no requirements in the design, the tensioning method of prestressed reinforcement shall be selected according to the structural characteristics of prestressed concrete, the shape and length of prestressed reinforcement and the construction method; √ when determining the tensioning sequence of prestressed reinforcement, it shall ensure that the concrete does not produce overstress, the components do not twist and side bend, and the structure remains unchanged; √ during tensioning, operators can only work on both sides of the tensioning end, and protective devices shall be set behind the tensioning jack; √ operators shall not leave their posts during the start-up of the oil pump.
For the assembled integral structure, representative units shall be selected for trial installation.
Before pouring concrete for the connection parts of fabricated structures and composite components, the concealed works shall be accepted, including: 1 Quality of rough surface of concrete, size, quantity and position of keyway; 2.
Road, water, electricity and site leveling), and the yard preparation of on-site temporary facilities and PC structure should be built; In order to meet the construction requirements of PC structure construction and the maximum weight of single component of PC structure, ensure to meet the hoisting distance of PC structure of each house.
√ the tightening of high-strength bolts is divided into initial tightening and final tightening.
The process and method of trial installation shall be approved by the supervision (construction) unit, and the construction process shall be adjusted and the construction scheme shall be improved in time according to the trial installation results.
The temporary support and tie-in during the installation of assembled integral concrete members shall have sufficient bearing capacity and stiffness.
Installation of prefabricated shear wall and column: √ installation process of prefabricated shear wall and column: elevation leveling and snapping of positioning line → correction of vertical reserved reinforcement → installation of spreaders and fasteners → hoisting and positioning of prefabricated shear wall and column → temporary fixation → correction → fixation; √ elevation leveling and snapping of positioning line; √ correction of vertical reserved reinforcement; √ installation of spreaders and fasteners; √ hoisting and positioning of precast shear walls and columns; √ installation and correction of precast shear walls and columns; √ connection of precast shear wall and column joints.
