In the conventional residential construction, the cast-in-place structure shear wall is plastered, such as: about 20 mm thick 1:3 cement mortar survived twice, the construction volume is large and there are common quality problems
.
Nantong No.2 construction project innovates the construction technology, adopts the “clean water shear wall no painting construction technology”, effectively eliminates the common quality problems such as hollowing and cracking of the painting layer, and also brings good economic benefits, which can be shared with engineering friends for reference
.
This technology can ensure the formwork and forming quality of the primary structure shear wall, at the same time, at the junction of masonry, shear wall and coupling beam, a stop is reserved at the external corner of the primary structure as a 30cm wide steel wire mesh working face, which can effectively ensure that there is no crack at the junction of the free painting of the fair faced shear wall and the painting layer of the aerated block masonry
.
It is suitable for shear wall, coupling beam, frame column and frame beam in main structure
.
Based on the engineering example, let’s take a look at the process of no painting of shear wall @ @ @ when erecting the formwork at the external corner of the structure, place a 15cm wide splint strip → reinforce and accept the formwork → concrete pouring → remove the formwork → fill the wall masonry → draw the slot at the joint mortar joint → embed the elastic putty in the slot → lay the steel mesh at the end → fill the wall painting → batch the cement putty on the whole surface → accept 1
.
Place the slat at the external corner of the structure During the pre assembly of shear wall and coupling beam formwork, vertical and horizontal splints are added at the internal side of the formwork and the external corner of the structure forming, with the width of 15cm and the thickness of 12mm
.
After the reinforcement of shear wall and coupling beam formwork is completed, the team will conduct full-time acceptance by the quality inspector of the project department after passing the self inspection
.
For the unqualified points found in the special inspection, full and accurate records shall be made, and the next process construction can only be carried out after the rectification and review
.
Special inspection and rectification for verticality acceptance of formwork 3
.
After the completion of concrete pouring and formwork removal, the formwork shall be removed after the concrete on the side of the vertical shear wall panel and coupling beam reaches a certain strength
.
The figure below shows the end formed at the external corner of the structure after formwork removal
.
After the formwork is removed, the joint of the structure entity 4 masonry and the structure is grooved
.
For the 20cm thick infilled wall, the 17cm wide aerated block is used for masonry in the middle, and 15mm is reserved on both sides of the masonry as the painting layer
.
During masonry, the mortar mortar joint at the joint with the main structure concrete shall be pre drawn with round steel groove, 15mm wide and 15mm deep
.
Joint groove 5 groove caulking mortar joint pre extraction groove part, before adding steel mesh, use special elastic putty to fill the groove tightly
.
Before painting, crack resistant steel wire mesh shall be laid at the junction of reserved seam and masonry wall, and the lap width of each substrate shall be 150 mm
.
Anti crack steel wire mesh 7 is laid at the junction to fill the wall and finish the plastering
.
After the block wall is sprayed, the masonry wall is plastered with the thickness of 15mm
.
The shear wall shall be free from painting with clean water, and the filling wall shall be painted to the end of reserved stop of structural shear wall and coupling beam
.
Before the plastering of infilled wall, after the plastering of infilled wall, 8 full face putty shall be applied
.
The details of fair faced shear wall or coupling beam shall be treated first: the partial depression shall be leveled by plastering gypsum, and the partial protrusion shall be polished or chiseled
.
After the angle is found, the large putty construction is carried out in two times (including masonry wall painting layer)
.
What needs to be explained in the putty approval is that the construction technology without painting has higher requirements on the construction quality of fair faced wall and beam
.
The project adopts high-quality phenolic mirror wood formwork, and the cost of formwork and formwork support is higher than that of conventional engineering; however, due to the non painting of shear wall and beam, the cost of large-area painting and the repair cost of later hollowing and cracking are saved
.
In general, the process saves cost and improves quality
.
——-
.
