The disadvantage is that the requirements for product protection are high, once the embedded rubber strip is damaged, it is difficult to replace, and the cost of weather resistant rubber waterstop is also relatively high.

In addition to the waterproof measures of concrete structure, the rubber water stop belt and multi-component weather resistant waterproof glue are used to improve the waterproof system of the whole precast wall panel, so as to truly achieve no leakage.

For rooms or buildings with particularly high waterproof requirements, polyurethane waterproof can be fully constructed inside the rubber waterstop to enhance the reliability of waterproof.

The performance requirements of weather resistant waterproof glue are relatively high.

Its disadvantage is that the waterproof quality is difficult to control, and cavity blockage occurs from time to time.

In view of the above factors, the waterproof design concept of precast buildings must be adjusted.

The outermost waterproof of the open line waterproof form adopts the embedded rubber strip, which makes the product quality easier to control and inspect.

A drainage pipe is set on the waterproof silica gel of the outer wall every three layers, which can effectively guide the rainwater infiltrating into the decompression space to the outside.

At present, the waterproof forms of precast exterior wall panel joints commonly used in practical application are mainly as follows: 1 The precast exterior wall slab (i.e.

according to certain specifications, and then carry out production prefabrication in the factory, and then transport it to the site for assembly.

3.

Construction points of waterproof treatment of precast exterior wall panel joints at present, the waterproof treatment technology of precast exterior wall panel joints is still relatively complex in technology, so there are great construction difficulties in construction.

Because it is a component assembled on site, it will leave a large number of assembly joints, which can easily become a channel for water penetration.

The outermost side adopts high elastic weather resistant waterproof silica gel, the middle part is the decompression space formed by the physical cavity, and the inner side uses waterproof rubber strips embedded in the concrete to press each other up and down to achieve the waterproof effect.

It should not only have high elasticity and aging resistance, but also have a service life of no less than 20 years, The cost is relatively high, and the quality requirements of structural adhesive construction are relatively high, which must be operated by a professional and experienced construction team.

The waterproof curtain is embedded on the inner side of the waterproof curtain, which is basically the same as the rubber waterproof curtain, but the waterproof curtain is embedded on the inner side of the waterproof curtain at the other end, At the same time, the outer rubber strip is provided with stainless steel air guide groove at a certain distance to balance the internal and external air pressure and drainage.

This joint waterproof form of exterior wall panel is one of the most used forms at present.

Therefore, precast buildings actually have some inherent weaknesses in waterproof.

The external precast exterior wall panel adopts the closed line waterproof form.

Its waterproof structure is very perfect, so the waterproof effect is also very good.

In addition, based on the principle of natural vertical flow of water under the action of gravity, the wall panel joint is designed into a groove shape with high inside and low outside in the design, combined with a certain decompression cavity design to prevent the water from creeping into the room through capillarity.

During construction, workers do not need to apply glue on the outside of the wallboard, eliminating the construction measures such as scaffold or hanging basket, which is safer and simpler.

In actual construction, we should formulate targeted construction schemes and measures according to different design requirements of exterior wall panel joints..

The dislocation of wallboard shall not be greater than 5mm, otherwise the water stop rubber strip cannot be pressed.

We believe that for the waterproof of precast buildings, water diversion is better than water blocking and drainage is better than waterproof.

In short, it is necessary to consider that a certain amount of water flow may break through the outer waterproof layer in the design, and guide this part of the broken water into the drainage structure and discharge it outdoors through a reasonable drainage path, Avoid further penetration into the room.

Because the precast exterior wall is assembled in blocks, we will inevitably encounter the problem of waterproof treatment of connection joints.

Several forms of waterproof treatment of precast exterior wall panel joints are introduced.

A layer of polyurethane waterproof is added outside the rubber waterstop at the cross joint between the walls, Its main function is to use the good elasticity of polyurethane to block the fine gaps that may be caused by the mutual dislocation of rubber Waterstops.

PCF slab) with internal pouring and external hanging mainly adopts the joint waterproof form of external drainage cavity and gluing, and the internal side depends on the self waterproof of cast-in-situ partial concrete.

Open line waterproofing is the most advanced form of exterior wall waterproof joint treatment at present, but it is a patented technology developed by foreign companies.

2.

Once the inner concrete cracks, it will directly lead to the waterproof failure of the wall panel.

This paper will analyze and introduce several existing waterproof technologies of precast exterior wall panels, and discuss some problems that need to be paid attention to in the waterproof construction of precast exterior wall panels.

The waterproof structure of closed line waterproof adopts the method of combining internal and external three layers of waterproof and dredging.

This wall panel waterproof form mainly has three waterproof measures.

The design concept of precast building waterproof precast building is to separate the structure of the building, such as wallboard, column, beam, floor slab, staircase, etc.

This paper will analyze and introduce several existing waterproof technologies of precast exterior wall panels, and discuss some problems that need to be paid attention to in the waterproof construction of precast exterior wall panels.

In addition, in some precast buildings, in order to resist the influence of seismic force, the outer wall panel is designed as an outer wall that can move within a certain range, which makes it more difficult for the waterproof of the joint of the wall panel.

Affected by the cost of patent use, there are still very few domestic projects using this technology.

The disadvantage is that the accuracy requirements during construction are very high.

Erection Anchor One Sided

Therefore, we must attach great importance to the treatment of waterproof joints of precast exterior wall.

Its advantage is that the construction is relatively simple and fast.