Steel frame greenhouse skeleton (or purlin) installation, according to the skeleton material is different, the construction machinery is different. There are roughly the following mechanical equipment: electric welding machine, grinding wheel cutting machine, profile cutting machine, Angle grinding machine, pistol drill, switchboard, power cord, hose glue gun and hardware tools.

The construction sequence of the project: component correction → rust removal → lofting marking → cutting molding → installation and welding.

This project roof purlin adopts steel square pass and C-type steel and other light steel, because light steel in the transportation and stacking process often produce bending and warping phenomenon, so the material into the field, the first straightening and leveling, using bending machine or manual correction work.

Dust and scale on the surface of steel should be removed before rust removal. The rust removal method of steel components in this project is a combination of manual and electrical tools. After the rust removal work is completed, the anti-rust primer should be brushed or sprayed once.

According to the size of the drawing, cut the C-shaped steel (or square pass) with the grinding wheel cutting machine into the appropriate length, and then weld the skeleton. The welding process uses AC arc welding machine, E43 series, in order to prevent the bite and welding defects, the use of small current and small diameter electrode (2.5-3.0mm) welding. The auxiliary fixture and fixture are used to ensure the accuracy of the geometry of the structure.

The steel skeleton is checked and corrected with a level and steel wire. The production process should be measured and corrected at any time, and the deformation should be controlled within the allowable range. The skeleton and the supporting plate surface are welded together, the skeleton production can assemble a part of the skeleton, and then lift it to the support tray to weld firmly, or it can be assembled and welded directly on the support tray, and the skeleton in the same slope direction should be on one surface.

After the skeleton is installed, dust, iron filings, oil and so on should be removed from the surface of the skeleton. According to the requirements of the drawing, brush the anti-rust paint again, wait for the anti-rust paint to dry thoroughly, and then brush the top paint and protective paint. For the metal skeleton of the roof, the painting is generally used by hand brush painting and air spraying.

The painting work follows the installation of the grid and the installation of the keel, and the painting worker should be equipped with a thermometer and thickness tester. The top paint should be painted manually on the site and should not leak. The optimal temperature for construction should be 5-30 degrees and the humidity should not be higher than 85%. Do not brush on rainy days. Brushing should be done in batches 12 hours apart, and can not be brushed too thick at one time to prevent flow marks. The ventilation environment should be good during construction, and attention should be paid to avoid open flames. Purlin frame production process, should be prepared in time roof panel and perimeter enclosure materials, so as not to delay the construction period.

Installation of steel frame greenhouse roof and envelope

The roof is mainly made of 50mm thick sandwich board, and the length of the roof board depends on the engineering needs and transportation requirements. The installation is connected with a hidden button, the use of self-tapping nails fixed on the purlin, the installation of the pressure plate requires a tight lap, the roof plate corrugated to ensure that the axis is perpendicular to the ridge, and the measuring instrument is pre-placed a straight line to determine the alignment of the overall board.

In large construction projects, in order to shorten the time, the crane can be used to lift the bundles of roof panels directly from the truck to the house frame, for longer boards, it is recommended to use the method of carrying a pole and lifting rope. For small and medium-sized projects, a single roof panel can be unloaded by hand, then tied with ropes, and then manually pulled to the roof frame for fixed installation. This project adopts manual handling construction.

In order to protect the surface of the molded steel plate and ensure the safety of the construction personnel, it is necessary to touch the molded steel plate with dry and clean gloves. Do not drag the roof plate on the rough surface or the roof plate surface molded steel plate, and other things such as tools can not drag on the roof plate surface molded steel plate surface.

When walking longitudinally along the roof panel, walk in its groove, and when walking laterally along the roof panel, try to stay close to or step on the roof support point. Generally, the load should be evenly distributed on the sole of the foot as far as possible, not concentrated on the heel or the tip of the foot. Wear soft-soled flats, not strip-soled shoes, which are easy to embed small stones. The surface of the newly disassembled roofing plate is greasy. Be very careful in your actions. Cutting the surface of the roof plate is inevitable, but pay attention to protect the other plates, because the chainsaw cutting will produce metal particles. If it must be cut on other roof plate surface molding steel plate, a protective material should be placed between the cut roof plate surface molding steel plate and the lower roof plate surface molding steel plate, and make the roof plate surface molding steel plate face down, and it is best to put a metal cutting knife in the electric saw. Compared with emery wheel cutting, this can produce fewer metal particles, and the incision is smooth.

In general roofing and flooding board installation operations, tapping bolts, drilling holes, hand saws, chainsaws, or other operations will leave metal debris in the adjacent area on the roof, these debris and other debris (rivets, nails, screw lamps, etc.) must be removed from the roof, flooding board, gutter, etc., as soon as possible. Make this the end of your day. Especially after the entire roof installation is completed, it cannot be exempted. Neglect of this work will oxidize the metal debris and cause stains to form on the surface. When iron, copper, lead and other substrates contact with the surface of the aluminum-plated zinc plate, and are exposed to moisture or condensed water, it will cause damage to the aluminum-plated zinc layer, resulting in corrosion of the steel plate from the surface.

When you are hoisting the top sheet of the roof sheet to the floor ready for installation, make sure that all the top sheet of the roof sheet face up and that all the lap sides face towards the side of the roof to be installed. Otherwise, it will not only turn over the surface molded steel plate of the roof plate but also turn the surface molded steel plate of the roof plate. The sheathing of the roof plate surface pressure plate shall be placed near or on the purlin support point, and not in the purlin span, before fixing the first board, to ensure that its position is vertical and square, and it is correctly placed in the position related to other building components.

When the first sheet is fixed in place, a continuous alignment line is drawn at the lower end of the roof. This line and the first sheet of the roof will become a wire, which facilitates the rapid installation and correction of the subsequent sheet of the roof. Then find each roof area during the installation to determine the section detection, the method is to measure the width of the fixed roof plate surface molded steel plate, at the top and bottom of the measurement once to ensure that there is no movement and fan. At some stages, such as halfway to installation, the distance from the top and bottom of the fixed roof plate surface molding steel plate to the far side of the roof or the finish line is also measured to ensure that the fixed roof plate surface molding steel plate is parallel to the finish line. If adjustments are required, each plate can be placed and fixed later with a slight fan adjustment. Until the surface of the roofing plate is flat. According to the construction drawings, the complete sets of grid roof panels are stacked in the material stacking field, the complete sets of grid roof panels are hoisted to the design position, and the connection is fixed with the hanging.

The connection between the color steel plate and the steel structure purlin should use bolts or self-tapping screws. When using bolts, large sections should be used, and the fastening force should be moderate and firm to avoid pits at the connection fastening point. Wall bolts should be neat. Symmetrical, evenly spaced. The color steel plate for the corner, that is, the corner plate should be marked in detail on the construction drawing and constructed according to the drawing. The inner and outer wrapping Angle of the corner plate should be colored steel corner plate or aluminum corner plate, and the joint should be smooth and dense, and keep smooth and vertical with the connected color steel plate wall surface. The connections at the corners of the corner plates should be neat and consistent. Horizontal and vertical directions should be straight line, no obvious dislocation of the joint shall not appear obvious sag, the inner and outer envelope corners shall not appear wavy warping after connection. During installation and construction, the roof waterproofing project shall comply with the relevant technical requirements of the roof waterproofing project, and the following principles shall also be observed:

1) The roof slope shall not be less than 5%, and shall not be less than 8% under corrosive environmental conditions.

2) Roof panels shall not be overlapped if conditions permit. When it is necessary to lap, it should be joined in the long direction of the slope, and the lap point must fall on the purlin or the support. When the roof slope is less than or equal to 10%, the lap length should not be less than 250mm, when the roof slope is greater than 10%, the lap length should not be less than 180mm. The part of the lap steel plate should be connected by stitching nails or pulling rivets, and the middle distance should not be greater than 300mm. All lap joints must be sealed with sealant or waterproof material, and waterproof measures should be taken for exposed nail heads. Where the roof plate must be bonded along the long direction of the slope, the first push the hidden buckle plate. With self-tapping nails, the special fixing seat of the hidden buckle plate is fixed on the purlin, and then the hidden buckle plate is laid on the special support, and the lap part is clamped with a special fixture at the peak of the plate wave, and the board is fixed as a whole. During the construction process, rivets or self-tapping nails can not be played at the trough of the roof to avoid water seepage or water leakage of the roof plate (corrugated type). The side lap of the roof plate should be consistent with the main direction, and the lap part must be equipped with waterproof sealing materials.

Angle coated watercolor steel plate. Eaves dripping color steel plate and other accessories should be as far as possible in the leeward direction or along the direction of the crimp, the crimp length should not be less than 60mm, can be pulled rivet connection, the spacing should not be greater than 200mm, the installation should pay attention to the side seam straight. The roof panel should avoid opening holes as far as possible, and the holes should be opened according to the design requirements, and do the corresponding technical treatment.