After pouring for 6 hours, pull out the plastic sleeve and mark the installation position of the component with steel nails.

Figure 11 component stacking (3) during installation, first align the control line with the laser, scrape the mortar at the junction between the precast door frame and the wall, align the positioning line riser up and down, squeeze the mortar on the side, plug the lower end with wedge-shaped wood strip, adjust the verticality, flatness and installation height, fix the anchor bolt and pipe clamp, take out the wedge-shaped wood strip after the mortar hardens, and fill the gap with homogeneous mortar.

After training, three installation workers can complete the installation of 30 door frames and lintels on the first floor in one day, which greatly improves the construction efficiency.

Figure 1 Schematic diagram of process practice Figure 2 Schematic diagram of anchor bolt Figure 3 Schematic diagram of top connection figure 03 optimization of process flow drawing → training and disclosure of operators → formwork design and processing → reservation and embedding → reinforcement binding → concrete pouring → component maintenance → component installation → review and acceptance 3.1 drawing optimization optimize the layout of partition board according to the specifications, and mark the position of structural column to be precast in the drawing.

The concrete strength of door frame is C25.

Snap vertical control lines and horizontal elevation lines on the concrete walls and columns on both sides of the wallboard to control the verticality and flatness of the whole wall and the elevation of the door opening.

Disclosure shall be made to the partition board installation team and it is required to construct according to the optimized drawings.

Source: for network infringement, please contact and delete from the overview of technical service platform 01 project of Nantong second construction group.

After the research of the project department, it is decided to adopt the construction technology of partition board wall cast door frame, adopt precast door frame lintel instead of traditional cast-in-situ door frame lintel, complete the component formwork assembly and concrete pouring on the ground, and then transport the formed components to the finger location for installation.

6 reserved holes of plastic casing 3.4 formwork matching, reservation and embedding prepare the formwork according to the formwork matching diagram, embed the plastic casing at the reserved hole, and fix the pipe clamp on the formwork at both ends with steel nails.

Figure 8 placement of reinforcement cage 3.6 concrete pouring.

(4) Compared with the traditional door frame pouring method, the construction is simple and fast: the reinforcement is bound on the ground and the concrete is poured in the mold, which is convenient for construction.

The 1# building has 24 floors in total, with a building area of 11336.4m2.

5 formwork matching diagram of components Fig.

Fig.

It is believed that the process can be popularized and applied in more projects.

Figure 9 concrete pouring and casing removal 3.7 door frame installation (1) pop up the side line and control line of door frame as required.

The economic benefits are calculated as follows (due to the same amount of reinforcement and concrete, it will not be considered in the calculation): 05 summary: in view of the problems raised by workers in the construction of secondary structure door frame and lintel, the project department has established an innovation team to carry out minimally invasive new activities, using the construction technology of partition board wall assembled door frame, and substituting prefabrication for cast-in-situ, While improving the construction quality, good economic benefits have been obtained.

It is required to be poured and formed at one time, and fully vibrated with portable micro vibrator.

3.3 the formwork design and processing shall draw the formwork matching drawing according to the component size, and it is required to mark the component size, hole position, etc.

Block B (phase II) of commercial housing development project of plot 2019-c-13 in chengdi is composed of six high-rise residential buildings, two public transformers, two property houses and underground garage, including 25 floors of 1 ~ 3 # buildings and 17 floors of 4 ~ 6 # buildings, with a total construction area of 77189.75 square meters, an aboveground construction area of about 59000 square meters and an underground construction area of about 18000 square meters.

(3) The precast components have good appearance, controllable installation quality, installation perpendicularity and flatness can meet the requirements, and the forming quality is good.

Ferrule Insert

Figure 10 schematic diagram of control line (2) when the components are transported to the installation floor, they shall be handled with care and padded with wooden square to avoid damage to the components.

If there is any infringement, please contact the background to delete it..

Scope of application: this process is applicable to the construction of secondary structure door frame and lintel of partition board wall.

04 benefit analysis: a total of 26 door frames and 4 lintels.

4 drawing optimization 3.2 training and disclosure of operators training and disclosure of carpenters, bricklayers, reinforcers and component installation teams, introducing process flow, standardizing operation action, and putting forward quality, safety and civilization requirements.

Source: the network copyright belongs to the original author.

Watering and curing shall be carried out in time after pouring.

Arrange the woodworking team to process and assemble the formwork according to the formwork matching drawing.

12 mortar laying of partition board and precast components Fig.

Fig.

14 anchor bolt fixation 3.8 recheck and acceptance check the appearance quality of precast components and partition board without serious defects; Anchor bolts and pipe clamps shall be fixed firmly, and the mortar for slab joints shall be full and dense; The allowable deviation of axis position of component installation is 3mm, the allowable deviation of installation elevation is 3mm, and the allowable deviation of component perpendicularity and flatness is 3mm.

Fig.

Figure 7 formwork assembly 3.5 fabrication of reinforcement cage, longitudinal reinforcement 4C12 and stirrup A6@200 The reinforcement cage shall be bound according to the size of the formwork, and the thickness of the protective layer of the reinforcement shall be reserved.

(2) Less procedures, less consumption of formwork materials, labor saving and cost saving.

02 process features (1) dry operation replaces wet operation, which is simple to operate and has high construction efficiency.

The 2 ~ 25 floors of 1 ~ 3# buildings are standard floors.

After calculation, the area of cast-in-situ structural formwork is 34.8m2, the contact area of formwork is 22m2, and the timber is 377.4m; The area of cast door frame formwork is 13.3m2, and the timber is 251.6m.

13 installation of door frame and adjustment of verticality Fig.