Analysis of expansion joints in floor heating engineering and how to set expansion joints.
2018-04-02 15:43:02 Category：Industry information Visits
【Introduction】The expansion joint is a very important part of the design of the ground heating engineering. In order to prevent the ground from being destroyed by heat expansion and contraction, the filling layer must be set according to the requirement.
One, what is a expansion joint
The expansion joint is a very important part of the design of the ground heating engineering. In order to prevent the ground from being destroyed by heat expansion and contraction, the filling layer must be set according to the requirements.
In addition to the expansion function of the filling layer, the expansion joint (the boundary heat preservation strip) set at the junction of the wall, the column and the cross door can also serve as a thermal insulation, so it is also called the edge angle insulation or the wall corner insulation. With the upgrading of materials in the heating market, the boundary insulation strips and expansion joints are totally independent of 2 different materials.
Two. How to set the expansion joint
When the ground radiant heating is used, the inner surface temperature of the wall adjacent to the ground will increase. In order to reduce the invalid heat loss and the heat transfer between the adjacent users, and considering the convenience of the construction, the width of the expansion joint at the junction of the inner and outer walls, columns and doors should not be less than 10 millimeters.
Its setting shall be in accordance with the following provisions:
1. an uninterrupted expansion joint should be left at the intersection of the vertical components such as the inner and outer walls and columns. The expansion joint filling material should be connected by the lap way, and the lap width should not be less than 10 millimeters.
2., when the floor heating area is over 30 square meters or the side length is over 6 meters, the expansion joint shall be set at the spacing of not more than 6 meters, and the expansion joint width shall not be less than 8 mm.
3., expansion joints should be made from the upper edge of the insulation layer to make the upper edge of the filling layer.
Three, the floor heating pipes at the expansion joints should be protected.
In the process of laying water and earth heating system, the expansion phenomenon of the filling layer in the vicinity of the expansion joint will be particularly obvious, and the expansion is not only in the horizontal direction, but also in the vertical direction.
It is difficult to show the damage of the heating coil in a short time, but after a few years, the creep resistance of the heating coil will be gradually weakened, and the service life will be shortened so that the life of the whole heating system will be directly affected.
Therefore, in actual construction, when the floor heating pipe must go through expansion joints, a certain length of thermal insulation casing should be used to protect the floor heating coil.
Four. Other matters of attention
Besides setting up expansion joints reasonably, there are many factors that cause ground cracks.
The expansion joints of the 1. corners must be continuous, without interruption, closely linked and tightly adhered to the walls.
2., the thickness of the filling layer must conform to the specification requirements. If there are conditions, it is best to add a layer of wire mesh above the floor heating coil to the ground.
3. the ground maintenance must be strengthened after the ground is poured.
4. when the ground heating is running, it is necessary to slow down the heating up according to the standard requirements.
Title：Analysis of expansion joints in floor heating engineering and how to set expansion joints. URL：http://www.boroachina.com/en/news/851.html