Steps 3 and 4 of the steel structure engineering construction plan: roofing, wall system installation and completion acceptance

The previous two articles also explained the steel structure engineering construction, steel structure foundation engineering and steel structure hoisting, and then Xiaobian will continue to explain the roofing, wall system and completion acceptance criteria for you!

(1) Installation of purlins and support systems

The purlins and supporting systems should be cooperated with the steel structure hoisting to carry out cross operations and flow construction.

The steel structure engineering purlin installation can be installed by pulley borrowing method, and the installation requires the screw hole position to be aligned and the tightening degree is reasonable. According to the specifications and use parts of the purlins, it is installed by manually hanging to the corresponding position of the roof or wall façade.

The support should be installed in time according to the requirements of the regulations, and the installation position is required to be accurate to meet the design requirements to ensure the overall rigidity and stability of the steel structure.

Immediately after the lifting is completed, the verticality and horizontality between the components should be adjusted, and in order to ensure the correct alignment between the continuous components, it is necessary to install the inter-column support and horizontal support and adjust these supports in time. Adjust the column brace should make one side of the column brace lock the other side relaxed, when the column has reached the verticality, the column brace should finally lock to the "taut" condition, but do not put the diagonal brace lock too tight and damage the member. From the eaves to the ridge, the roof is kept vertical by adjusting the horizontal support and aligning the roof beams with the ridge point as the center point. In short, the diagonal brace can only be locked after all components to be adjusted vertically and squarely.

Generally, the beam braces are attached to the roof beams on the ground, and bolts are used to connect to the roof purlins after hoisting. The table angle is fixed by expansion bolts, and the gable angle is installed from the cornice to the ridge and preferably fixed to the lower wing edge of the gable purlin.

When installing roof, wall tie rods and

tie rods, the horizontality of the purlins should be adjusted in time, and the bending and deformation of the purlins caused by transportation or stacking should be corrected.

Leveling: Before the purlin installation, the purlin support point should be measured and leveled, the low point should be appropriately raised, and the height difference between the purlins should be strictly controlled within ±5mm.

Bullet line: The purlin bearing point should be fixed according to the support point position

required by the design, so the support point should be ejected (or scratched) out of the center position with ink line for the installation and positioning of the purlin to ensure the straightness of the purlin and the layout according to the purlin layout drawing.

Vertical lifting and arrangement: after properly bundling the purlins according to the layout needs, use a car crane to lift them to the designated position, and then arrange the purlins according to the drawings and purlin specifications to achieve reasonable stacking and correct arrangement (or lift the purlins of various specifications in place according to the drawings on the construction site, and borrow pulleys to lift them to the roof).

Lap joint: the installer according to the layout of the purlin according to the requirements of the drawing bolt connection, before connection should measure the fixed point position to ensure that the spacing, position is correct, straightness is not more than 6mm, height difference is not more than 5mm.

(2) Installation of roof panels and edging panels

There is no joint longitudinally for the roof panel, and the gable end on one side of the construction site should leave the roof panel production site and the finished product stacking site. The roof panels are transported to the roof by lifting, and the installation sequence should take into account the dominant wind direction in the area, and the installation is laid from one end of the plant step by step. The order of roof panel construction is determined according to the site conditions.

First install the first board against the gable side, when the first roof panel is fixed in place, pull a continuous alignment line at the roof cornice, this line and the first roof panel will become the guiding reference, which is convenient for the rapid installation and correction of subsequent roof panels, and then each roof area should be regularly tested during installation, by measuring the width of the fixed roof panel. Measure once at the ridgeline (or the top of the board) and once at the cornice (or the bottom of the board) to ensure that there is no movement and fan, and to ensure the parallelism and perpendicularity of the roof panels.

The steel structure engineering roof panel bending parts mainly include ridge internal and external edges, sealing plates and ridge gable cornices edges, etc. (pay attention to the order of construction), these color plate bending parts and color plate connection with aluminum rivets, color steel bending parts accessories should be neat, beautiful, meet the waterproof effect, after all fixed, with sealant after a section and then gently wipe to make even, flashing board and other waterproof points should be coated with sealant.

1. Roof panel installation:

Construction sequence:

The construction sequence is determined by the order in which the structure is conditioned, and the normal construction sequence develops from one end of the roof to the other.

Construction procedure:

According to the structure of the metal roofing system and the installation program of the system, the construction procedure of this project is shown in the figure below

A

pedestrian walkway is set up on the purlins to ensure construction safety and construction progress.

When installing, use a crane to lift the board to the roof (manual lifting method can also be used). The lifting belt must be used for flexible lifting such as nylon belt or cloth belt, and steel belt must not be used. Protective wooden strips should be inserted between the package and the sling or packaging to prevent deformation of the board edge. The handling of the plate should be handled gently, avoid bumping, and it is strictly forbidden to mop the floor to avoid damaging the board. Before installation, the surface of the board should be cleaned first, and then check whether there is residue on the board surface, if so, clean the residue with detergent and water, and wipe the moisture on the surface with a dry cloth.

The laying direction of the

board must be laid in the reverse dominant direction, and the line must be bounced at any time during the installation of the roof panel to prevent accumulated errors. During roof panel installation, the ridge cover and waterproof plug (or roof panel bend) installation must keep up at the same time. The slab is sensitive to concentrated load, so during the construction of roof color panels, the construction personnel must not gather together to avoid local damage of the slab caused by concentrated load. When installing the roof panel, it is installed while lifting, at least the board on the lifting roof must be installed on the same day, and all the boards that are not installed on the same day must take corresponding measures to prevent falling.

Quality requirements: the size of the profiled plate is correct, the surface is clean, the undetectable concave and creased, the joint is straight, the vertical and horizontal lap is in a straight line, the seam is uniform and neat, and there is no warping and error-free drilling.

2. Installation of roof ridge plugs (or roof panel bends) and roof ridge panels

Pay-off positioning: the starting reference line of the first ridge plate, and the installation control line of the ridge plug (or roof panel bend) and the two sides of the ridge plug are determined in the installation direction.

Install the roof ridge plugging plate (or roof panel bend), the contact part between the plugging plate and the profile plate is fully coated with waterproof glue, and then install, seal the plug with waterproof glue to prevent leakage, and install subsequent plugs in turn. Install the first ridgeplate and adjust the positioning according to the starting reference and control line installation of the first ridgeplate. Measure the positioning plate of the bent water baffle on the ridgeplate, cut it with scissors, fix the roof plate with the specified pull rivets on the profile plate, seal the fixing with waterproof glue, and bend the water baffle according to the bending positioning line of the delineated bending positioning line.

3. Installation

of flooding, wrapping corners and expansion joint covers:

The pay-off determines the starting reference line of the first block, and determines the control line of the two sides of the board in the installation direction. Install the first piece, install the second plate according to the reference line and control line to adjust the positioning, fix it on the fixing plate, and seal the fixing with waterproof glue to prevent leakage. On the first plate, measure and mark the lap positioning line between the second plate and the first plate, apply waterproof glue to the lap part of the board, install the second plate to adjust the positioning, fix the fixing and apply waterproof glue seal, and install the second plate and subsequent boards in turn.

(3) Gutter installation

This project adopts galvanized steel gutter drainage, and the connection method between the two sections of gutter is butt welding.

Gutter butt welding. Before the gutter docking, the cutting mouth is polished clean, and the gap between the weld seams should not exceed 1mm when docking, and spot welding can be carried out only after confirming that the requirements are met. In order to improve the construction efficiency, several sections of gutter can be assembled together on the ground and then installed, which can greatly reduce the aerial work and improve the quality of the gutter splicing.

Open downhole holes. After installing a section of gutter, several holes should be drilled in the middle of the designed downspout position to avoid water storage in the gutter and affect the construction. After the plate corresponding to the gutter is installed, the sinkhole must be opened in time. Formal downhole with hollow drill cutter cut-out or cut-out machine opening

(4) Wall panel installation

In principle, the wall panel is constructed with tool-type external hanging mobile aluminum tube scaffolding or simple hanging frame. When installing, attention should be paid to the horizontal and vertical operation deviations to ensure horizontal and vertical, and at the same time, when installing the upper wall panel, the bottom wall purlin should be supported by square wood under it and reviewed. Before installing the exterior wall panel, install the upper flooding of the wall system, the flooding of the window and door side and the edge of the platform at the junction with the brick wall, and then install the lower flashing edging and the yin and yang corner boards after the wall panel is installed.

(5) Paint construction

After the steel frame is welded, the paint construction team enters the site to paint the on-site paint. Before painting, the components must be cleaned and sanded to ensure that the weld is flat. Then use anti-rust primer to prime, and wait 24 hours before topcoat. Other construction processes are the same as the painting process in the factory.

(6) Door and window engineering

After the door and window openings

are formed, the door and window construction team should review the size of the on-site openings and make the doors and windows according to the actual measured data. Install in the order of first sash and then sash. When the gap between the window frame and the hole is large, it should be filled with a foaming agent before gluing. The glass glue should be applied in place and evenly to ensure good sealing and look and feel quality.

4. Completion acceptance

Preparation for completion acceptance: do a good job of data sorting in accordance with specifications and design requirements; According to the principle of first team inspection, then project department inspection, and finally general contractor, supervision and owner inspection, the construction quality is accepted, and the unqualified process must be rectified in time, and the same problem must not be brought to the next inspection procedure.

Organize completion acceptance: invite local quality inspection stations to work with the five parties to inspect and accept the project data and construction quality. After acceptance, do a good job of binding and archiving materials.