1. 1 external formwork for box foundation
First, the construction points
Waterproof guide wall should be set during the construction of raft foundation slab. The guide wall is 300 mm higher than the floor epithelium, and the guide wall and the floor are poured together. If the guide wall template adopts single-sided formwork and the outer template adopts waterproof protective wall brick tire mold, in order to ensure the stability of brick tire mold, the outer side of the guide wall should be backfilled or reinforced with support, and a brick crib should be erected every 4 meters.
1.2 foundation formwork for raft overturning external beam wall
First, the construction points
Turning up the foundation formwork of the external beam wall on the raft is generally assembled with low-grade wood (bamboo) boards with a thickness of 12mm- 15mm in advance, and the external wood square is made into horizontal and vertical back stare blankly with a spacing of 30-40cm and a spacing of100-150cm. When the formwork height of the upper turnover beam wall is >: 50 cm, according to the requirements of the construction scheme, a formwork pulling rod is set, and a φ 40 water stop ring is welded on the formwork pulling rod; A formwork support rod is arranged at the bottom every 100 ~ 150 cm, and the formwork support rod is made of steel bar waste; Φ 48 short steel pipe or Φ 25 steel bar is used as the lock template vertically, with the spacing of120 ~150 cm; The outer guide wall shall be provided with 300-wide water-stop steel plate or water-stop tank according to the design requirements.
Second, the quality requirements
The rigidity and strength of the formwork meet the requirements of the construction scheme, the reinforcement is firm, the joint assembly is reasonable, economical and simple, and it meets the requirements of green construction. The water stop structure is correct and reliable.
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1.3 template for elevator shaft and sump
First, the construction points
Low-grade wood (bamboo) formwork is often used to assemble the elevator shaft and sump, which can be assembled in the outfield, and the tower crane is directly hoisted in into the pit. Template thickness is 12 ~ 15 mm, horizontal back stare blankly for wood square, vertical steel pipe; According to the size of the pit, the support system should adopt steel pipe or wood square; The bottom die is equipped with sandbags as anti-floating devices, and the number of sandbags is configured according to the pit size of 1.3 ~ 1.5 times.
Second, the quality requirements
The rigidity and strength of the formwork meet the requirements of the construction scheme, the reinforcement is firm, the joint assembly is reasonable, economical and simple, and it meets the requirements of green construction. Corners should be shaped with section steel.
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2 basement exterior wall formwork project
2. 1 plywood formwork for basement exterior wall
First, the construction technology
The wooden formwork of the basement exterior wall is assembled with multi-layer board or bamboo veneer plus wood square or steel pipe, which is assembled off-site according to the height of the wall and directly transported to the site, and reinforced with inclined steel pipe.
Second, the quality requirements
The rigidity and strength of the formwork meet the requirements of the construction scheme, the reinforcement is firm, the joint assembly is reasonable, economical and simple, and it meets the requirements of green construction. Corners should be shaped with section steel.
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2.2 unilateral shuttering of basement exterior wall
First, the construction points
The basement exterior wall is reinforced with steel formwork supported by legs, the exterior wall is reinforced with steel formwork without legs, and the exterior template is reinforced with opposite bolts.
Second, the quality requirements
The rigidity and strength of the formwork meet the requirements of the construction scheme, the reinforcement is firm, the joint assembly is reasonable, economical and simple, and it meets the requirements of green construction. Corners should be shaped with section steel.
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3, underground waterproof engineering
3. 1 waterproofing of floor and external walls
First, the construction points
Slab laying method or point adhesion method should be adopted for the coiled material of the concrete plane part of the bottom cushion, and full adhesion method should be adopted for other parts in contact with the concrete structure; Coil joint must be closely pasted, and the joint width shall not be less than10 mm; ; At the corner between the inside and the plane, the seam of the coil should stay on the plane, and the distance from the facade should not be less than 600mm；; The leveling layer at the angle of Yin and Yang should be made into an arc or 45. ( 135。 ) Angle, and should increase 1 layer of the same coil, the width should not be less than 500mm；; Waterproof base must be flat and firm. Before the coil is laid, the surface of the base should be dry, and the moisture content of the base should be less than 9%. Before the construction of the new operation surface, measure the moisture content of the base with a simple method, that is, cover it with 1m2 coil for 4 hours, and then check the condensed water. If there is no condensed water, you can lay a coil.
Second,
3.2 Exterior wall cement-based permeable crystalline coating waterproof
I. Engineering practice
Before the construction, about 15 minutes, thoroughly water the construction surface with clear water in advance; When scraping, press the knife hard, so that the inclination angle between the scraper and the coated surface is 50 ~ 60, and press the knife evenly. Paint is generally scraped once or twice, with a total thickness of 0.8 mm, and the scraped waterproof paint must be dipped in water with a paint brush immediately before initial setting and evenly coated; After the waterproof coating is completed, it must be sprayed with clean mist water for maintenance.
Second,
3.3 Floor waterproofing materials staggered joints
First, the construction points
The lap length of the long-side and short-side two coils should not be less than 100 mm, the width of the seams of two adjacent coils should be staggered 1/3- 1/2, and the seams of the upper and lower coils should be staggered 1500- 1600 mm, and the upper and lower coils should not be paved vertically. The internal corner and additional layer are the same as the waterproof of the bottom plate and basement exterior wall.
Second, the quality requirements
Coil lap width allowable deviation-65438+/-00 mm; Lap seam should be pasted or welded firmly, sealed tightly, without wrinkles, warping and bubbling.
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3.5, elevator shaft, sump waterproof
First, the construction points
The angle of yin and yang of the elevator shaft and sump base must be made into an arc of ≥50 mm or more or 45. ( 135。 ) splay angle, Yin-Yang angle, facade Yin-Yang angle and construction joint are all 500 mm wide additional layers. The second waterproofing membrane on the inclined surface of elevator shaft and sump is sandy, which is convenient for the construction of waterproof protective layer.
Second,
3.6 bolt hole treatment
First, the construction points
After form removal, take out the embedded pad, cut the bolt along the edge of the concrete structure, coat the cut part with antirust paint, embed waterproof ointment (embedded 2/3), and finally smooth the bolt hole with polymer mortar.
Second, the quality requirements
The bolt root is 0~5mm lower than the wall surface, the paint does not pollute the concrete wall surface, the waterproof ointment bolt hole is 2/3D, the polymer mortar is not lower than M5.0, the mortar surface is smooth, and the height difference with the wall surface is not more than1mm. ..
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2, the main structure engineering
Reinforcement engineering
2. 1. 1 straight thread head inspection
First, the construction points
The inspection of the thread diameter and size of the rebar thread head shall conform to the through-hole gauge and can be smoothly screwed into the whole effective buckle length.
Second, the quality requirements
The depth of screwing the gauge into the threaded head should be less than or equal to 3P(P is the pitch).
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2. 1.2 Check the effective tightening length of straight thread head.
First, the construction points
The processing personnel visually inspect the appearance quality of the thread heads one by one. Take the thread heads produced in each shift as a batch, and sample 10% thread heads with ring gauge. When the sampling inspection is unqualified, all the thread heads in this batch shall be inspected one by one with ring gauges, the unqualified thread heads shall be eliminated, and the equipment shall be adjusted until the processed thread heads are qualified.
Second, the quality requirements
The effective screwing-in length of steel wire head shall be tested with special wire head splint or special caliper plate, and the allowable deviation shall not be greater than1p.
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2. 1.3 horizontal steel bar anchorage at the end of wing wall
First, the construction points
The horizontal reinforcement at the end of the wing wall should be pulled to the opposite side, and made a straight bend of 15d. During construction, the horizontal reinforcement should be controlled to be straightened to the inside of the opposite vertical reinforcement, and the horizontal reinforcement outside the corner wall should continuously pass through the corner.
Second, the quality requirements
The main reinforcement of the wall and the upper and lower reinforcement of the bottom plate shall be properly fixed and firmly bound to ensure the correct position, and the concrete shall be inspected and trimmed by special personnel.
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2. 1.5 horizontal steel bar anchorage at the end of corner wall
First, the construction points
The horizontal reinforcement at the end of the inclined wall should extend to the opposite side and have a straight bend of 15d. During construction, the horizontal reinforcement should be controlled to extend straight to the inside of the opposite vertical reinforcement, and the horizontal reinforcement outside the corner wall should continuously pass through the corner.
Second, the quality requirements
The main reinforcement of the wall and the upper and lower reinforcement of the bottom plate shall be properly fixed and firmly bound to ensure the correct position, and the concrete shall be inspected and trimmed by special personnel.
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2. 1.7 wall hole reinforcement
First, the construction points
When the size of the hole is ≧200mm, additional reinforcing bars, structural reinforcing bars, embedded parts, electrical conduits, junction boxes, prestressed reinforcing bars and their accessories are arranged at the mouth of the cave. Accurate position, firm binding, fixed parts need to be welded. It is not allowed to bite steel bars, and the installation is firm. Do not weld on the main reinforcement, and additional reinforcement shall not be welded on the reinforcement, but tied to the main reinforcement.
Second, the quality requirements
The center line position and horizontal elevation difference of embedded parts shall meet the design requirements, and the concrete shall be inspected and trimmed by special personnel.
2. 1.9 steel bar at beam tube hole
First, the construction points
When the foundation pile cap beam is perforated, the hole size d is less than or equal to h/5, and the clear distance of continuous perforation is greater than: 4d; When opening a hole in a frame beam, the hole size d is less than or equal to H/5 and less than or equal to150 mm, and the hole is continuously opened >; 3D .
Second, the quality requirements
The center line position and horizontal elevation difference of the reserved hole should meet the design requirements, and the concrete should be inspected and trimmed by special personnel.
Third,
2. 1. 1 1 Placement sequence of reinforcement for primary and secondary beams
First, the construction points
In the frame structure, the upper and lower main bars of the secondary beam are placed on the upper and lower main bars of the main beam, and the upper and lower main bars of the frame connecting beam are placed on the upper and lower main bars of the frame main beam.
Second, the quality requirements
The type and length of steel bars should be accurate, and the steel bars should be fixed and bound firmly to ensure the correct position. The thickness of the protective layer conforms to the specifications, and the concrete shall be inspected and trimmed by special personnel.
2. 1. 15 stirrup cancellation principle
First, the construction points
When the horizontal reinforcement of the wall is arranged upwards, the reinforcement in the floor will not be cancelled. The coupling beam cancels the concealed column reinforcement. Frame column stirrups are not cancelled in beams, and beam stirrups are cancelled in columns.
Second, the quality requirements
The variety, quantity and position of reinforcement comply with the design requirements, the spacing lap and the thickness of protective layer comply with the specification requirements, and the concrete pouring shall be inspected and trimmed by special personnel.
Third:
2. 1. 17 wall vertical grid reinforcement
First, the construction points
Vertical ladder bars are used to control the cross-section size of concrete, protective layer of steel bars, row spacing of steel bars and horizontal spacing of steel bars. They can replace the vertical steel bars in the wall, but they are one size larger than the design diameter (for example? 12 becomes? 16)。 The initial reinforcement of vertical ladder lattice reinforcement is 50mm from the ground.
Second, the quality requirements
The variety, quantity and position of reinforcement comply with the design requirements, the spacing lap and the thickness of protective layer comply with the specification requirements, and the concrete pouring shall be inspected and trimmed by special personnel.
Third,
2. 1. 18 wall horizontal grid reinforcement
First, the construction points
Process description: the horizontal grid ribs of the wall are fixed at the upper mouth of the wall 300~500mm, which is used to control the spacing and position of the vertical ribs of the wall and can be recycled.
Second, the quality requirements
The variety, quantity and position of reinforcement comply with the design requirements, the spacing lap and the thickness of protective layer comply with the specification requirements, and the concrete pouring shall be inspected and trimmed by special personnel.
2. 1. 19 Positioning stirrup frame
First, the construction points
A positioning stirrup frame is arranged at the upper mouth of the frame column formwork to control the displacement of steel bars. The positioning hoop can be divided into internal control and external control, and the positioning hoop placed at the top of the column can be recycled.
Second, the quality requirements
The variety, quantity and position of reinforcement comply with the design requirements, the spacing lap and the thickness of protective layer comply with the specification requirements, and the concrete pouring shall be inspected and trimmed by special personnel.
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