Analysis of the 10 causes of water leakage in various parts of the roof of the steel structure factory:
The color steel plate maintenance system of the steel structure factory building has a certain strength and rigidity. The material generally does not leak. The main reason for the leakage of the maintenance system is the improper handling of the nodes, the quality of the material, the maturity and completeness of the system design, the structure, and the installation technology It also directly affects the waterproof effect of the enclosure system. When the color steel plate shrinks and deforms due to changes in the environment and temperature, and the interface and lap joints are displaced, the common sealing strip or silicone glue and the color plate surface bond can not be synchronized when the displacement occurs. Cause the color steel roof to leak. Different daylighting panels have different degrees of deformation and aging in the same time. The same is the nailing board, and the installation effects of different construction teams are also completely different. The main distribution of water leakage by location is as follows:
1. Roof area:
The main reasons for water leakage in this part are: the crest of the roof is too high, and the roof ridge cover cannot guarantee waterproof; the longitudinal lap is not installed for waterproof, forming a gap and leaks; the longitudinal lap of the ridge cover is connected by rivets, and the thermal expansion and contraction strength are not enough. The rivets are broken, causing water leakage; no plug is placed between the roof ridge cover and the roof panel, or the plug is placed irregularly and falls off to cause water leakage.
2. Roof air floor position:
The main reason for water leakage in this part is: no foam plug is placed under the edge of the air tower and the roof junction and the longitudinal overlap of the edge is not installed for waterproofing; the roof outer panel is not plated at the air tower junction; the air building structure pillar is open The holes are not waterproofed; the production and installation of the gas tower itself may cause water leakage.
3. Part of the lighting board:
Waterproofing of daylighting panels is an important part of maintaining the waterproofing of the system. The laying of cement and waterproof screws in the installation of daylighting panels are the main hidden dangers of roof leakage; the type of daylighting panels does not match the roof panel type, and the wave peaks on both sides of the daylighting panels are higher than the roof panels. After installation, the sealing is too tight to form the air pressure difference between the inside and outside of the daylighting panel. Capillary water enters the roof from the gaps on both sides of the daylighting panel and leaks into the roof; the longitudinal lap length of the daylighting panel is not enough, and the cement is aging and loses its viscosity; the vertical clay falls off; the daylighting board and color steel plate There is a rigid overlap, and the gap in the middle is not sealed.
4. Roof openings:
The opening of the color steel plate roof of the steel structure workshop must be to solve both the appearance and the waterproof problem of the roof. These two problems must be determined according to the opening form and the color steel roof panel model. The main reasons for water leakage in this part are: the opening of the fan is not waterproofed according to the design node, and the steel plug is not installed for waterproofing; the reserved area around the opening of the fan is small, rainwater is not flowing smoothly, and water is easy to accumulate; The side lap is not waterproofed; no structural parts are added around the inside of the opening, forming low-concavity stagnant water; there is water blocking phenomenon in the waterproofing construction, forming a stagnant water.
The main source of the water leakage problem at the cornice is that the external roof panel is not installed with foam plugs, and the external roof panel is not lowered; the length of the wall external panel is insufficient, and the cornice is not waterproof.
Lap joints and bridging joints are the two key parts of water leakage. Compared with reinforced concrete roofs, steel roofs have a small gutter depth, and there is no continuous waterproof structure between the gutter and the roof. Leaking. The main reasons for water leakage in this part are: there are gaps in the welded joints of the inner gutter, forming water seepage; the design of the gutter and rainwater pipe diameter is too small, and it does not match the slope length of the plant; the end of the gutter is not made of a head plate; the roof outer plate extends If the length of the gutter is insufficient, the water will flow back into the plant.
7. Canopy position:
The main reasons for the water leakage in this part of the steel structure factory building are: improper handling of the interface between the awning and the attached house; no plug is set between the awning and the outer wall or not extending into the outer wall according to the design requirements.
8. The interface between the factory building and the attached room:
The main reason for water leakage in this part is unreasonable construction, and the installation of the interface closing edge does not meet the design requirements
9.Brick wall and light steel roof connection part:
This part is easy to form a hidden danger of water leakage, and the joint between the roof panel and the cement wall leaks. The main reason is that the stress is not synchronized, which causes the structural wall and the steel plate to crack and leak.
10.Aluminum alloy window parts:
The connection between aluminum alloy window and color steel wall and brick wall is one of the waterproof problems. The main cause of water leakage in this part is: there is a gap between the wall purlin and the aluminum alloy; the lower opening of the window and the steel structure, the brick wall and the window The sealing between the glass and the profile is not tight; there is a large gap between the window sill and the table or there is a phenomenon of backwatering; the upper part of the window is installed without waterproofing.