The turning position of the waterstop shall be made into a circular arc.
8 post cast strip formwork erection according to the sequence relationship between the waterproof construction time of basement side wall and the construction time of post cast strip of basement side wall, the post cast strip of basement side wall is divided into two categories: Waterproof after post cast strip construction and waterproof before post cast strip construction.
Steel wire shall be fully tied and fixed at each joint position of longitudinal and transverse reinforcement on the inner and outer surface of the outer wall to avoid slurry leakage.
Within the cross-section of the wall on both sides of the water stop steel plate, the fine reinforcement is welded into a mesh, and the support mesh is welded with the end reinforcement and wall reinforcement to form a support mesh.
7.
The waterstop shall be fixed with special reinforcement and bound with the bottom plate reinforcement to form a stable structure.
（2） Machines and tools preparation 1.
The water stop steel plate shall be connected by welding.
Construction process 1 key points of basement exterior wall reinforcement construction: the reinforcement shall be bound horizontally and vertically, and the vertically distributed reinforcement within the post pouring range shall not be bound.
(2) When the waterproof construction is carried out first, the key points of formwork erection of the post cast strip in the basement: first build the brick matrix membrane of the outer wall or install the precast slab at the position of the post cast strip on the side wall of the basement close to the poured side wall on both sides, and plaster it, and pave the waterproof coiled material on the plastered surface (the post cast strip is continuously opened).
Main tools: pump truck, concrete vibrator, hammer and chisel.
During chiseling, manual hammer + chisel or electric hammer shall be used to remove the steel wire mesh and loose concrete on both sides and expose the complete and rough stone surface.
4.
(1) during waterproof post construction, the key points of formwork erection of basement post cast strip: the side wall post cast strip adopts split water stop screw, steel pipe and formwork to form a formwork erection system.
3.
Control points (I) quality control points of water stop steel plate 1.
The ponding at the bottom of the post cast strip shall be drained and the sundries shall be cleaned..
Generally, for the post cast strip with width of 800mm, the horizontal spacing of water stop screws is 300mm, the vertical spacing is 450mm, and the vertical back ridge is 50 × 100mm wood brace, a48 for transverse main ridge × 3.0 double steel pipe.
The thickness of water stop steel plate is 3mm, the width is not less than 300mm, and the bending is 30-50cm.
The short reinforcement head shall be set in the middle of the steel plate.
The installation of water stop steel plate shall pay attention to the direction of facing the water surface, and reverse installation is not allowed.
2.
6.
2.
Construction preparation (I) technical preparation 1.
The steel wire mesh shall be set close to the reinforcement head on the side of the pre cast concrete to ensure the embedded depth of the water stop steel plate.
6 key points of construction joint flushing: after removal, use high-pressure water gun to flush the construction joints on both sides, and clean up the sundries in the post cast strip.
Prepare special construction scheme and carry out scheme disclosure and technical disclosure.
3.
3.
3.
When masonry retaining wall is used outside the post cast strip of basement side wall, 240mm thick brick retaining wall is used when the filling depth is less than or equal to 5m, and 480mm thick brick retaining wall is used when the filling depth is greater than 5m.
The surface of water stop steel plate shall be free of oil stain, fracture and obvious corrosion.
The steel plate shall be fixed according to a 20-30cm short reinforcement head to ensure the stability and reliability of the steel plate.
Key points for installation and construction of external wall post cast strip waterstop: steel plate waterstop shall be welded and fixed firmly with 8mm diameter short reinforcement, and the connection position of steel plate shall be fully welded, facing the water surface outward; The fixed reinforcement of rubber waterstop shall be bound firmly.
When the wall formwork is removed, a row of water stop screws near both sides of the post cast strip shall be kept intact for formwork erection of the post cast strip formwork.
4 key points of concrete pouring construction on both sides of the post pouring belt: concrete pouring on both sides shall not be sprinkled into the post pouring belt.
3.
The reinforcement in the post cast strip shall be bound according to the reinforcement drawing of the outer wall.
2.
Chiseling shall ensure that the finished surface is a complete rough stone surface.
4.
Construction points of welding reinforcement on the side of post cast strip and binding steel wire mesh: the steel wire mesh shall be separated by double layers, distributed on the back of post cast strip, and fixed with steel wire at the intersection of horizontal reinforcement and vertical reinforcement of exterior wall.
Steel wire shall be fully tied and fixed at each joint position of vertical and horizontal reinforcement on and below the bottom plate to avoid slurry leakage.
The short reinforcement mesh shall be welded firmly to avoid the concrete from entering the post cast strip.
10 key points of concrete curing construction: different curing measures shall be taken according to the climatic conditions to ensure the moisturizing and thermal insulation of the concrete surface of the post cast strip.
Check the slurry leakage of steel wire mesh in real time and block the slurry leakage position.
7.
The weld shall be tight and full without missing welding.
（4） Key points for quality control of concrete pouring and curing 1.
2.
The outermost post cast strip of the side wall shall take the masonry wall or precast slab as the formwork, and the inner side shall be constructed by one-sided formwork.
The width of waterstop shall not be less than 50cm, the connection shall be hot pressed welding, and the joint shall not be set at the corner.
5.
（3） The construction unit has prepared the external wall protection scaffold on site.
The concrete pouring shall be watered 1 hour in advance to wet the working surface.
（2） Key points for quality control of rubber waterstop 1.
9 key points of watering and concrete pouring construction: watering and wetting the surface 1 hour before pouring, pouring with micro expansion impermeable concrete one grade higher than the concrete on both sides, and calendering with a calender after pouring and vibrating to ensure that the post pouring belt is flush with the walls on both sides.
（3） Key points for quality control of post cast strip chiseling 1.
The steel wire mesh shall be set close to the reinforcement head on the side of the pre cast concrete to ensure the embedded depth of the water stop steel plate.
Post cast strip chiseling shall be carried out after the concrete strength reaches 100%.
The joint review of construction drawings has been completed, and the drawings have been reviewed and sealed for confirmation.
2.
The material quality assurance certificate shall be retained and passed the retest, including: rubber waterstop retest report, concrete material certificate, steel waterstop certificate, reinforcement retest report, etc.
It is strictly prohibited to weld through the steel plate.
2.
After chiseling, wash the stone surface with a water gun.
Mechanical equipment: grinding wheel cutting machine, electric welding machine, air compressor and electric hammer.
2.
5 key points of construction joint chiseling: chiseling shall be carried out after the concrete reaches the 28 day deadline.
The distribution bar of the post cast strip of the external wall shall be bound, and the exposed reinforcement in the post cast strip shall be coated with cement slurry for protection to prevent rust after long-term placement.
According to the current relevant specifications, this paper introduces the construction preparation, construction technology, construction key points and quality inspection standards in detail for the post cast strip construction of basement side wall, which can be used as a reference for everyone.
