The waterproof form of open line waterproof is basically the same as the two waterproof measures of closed line waterproof on the inner side, i.e.

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

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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.

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

This wall panel waterproof form mainly has three waterproof measures.

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

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.

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.

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.

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

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.

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.

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.

However, in the waterproof measures on the outer side of wallboard, open line waterproof does not adopt the form of gluing, but uses one end embedded in wallboard, The curtain shaped rubber strips extending out of the wall panel at the other end are overlapped up and down to play the role of waterproof.

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

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

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

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

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

grooved decompression space and compacted waterproof rubber strip on the inner side.

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

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

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.

2.

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

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.

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

At the same time, the outer rubber strips are provided with stainless steel air guide grooves at a certain distance to balance the internal and external air pressure and drainage.

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

In addition to the waterproof measures of concrete structure, Only by using rubber waterstop and multi-component weather resistant waterproof glue to improve the waterproof system of the whole precast wallboard can we really achieve no leakage.

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

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

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

The performance requirements of weather resistant waterproof glue are relatively high, which should not only have high elasticity and aging resistance, At the same time, the service life is required to be 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.

In short, it is necessary to consider that a certain amount of water flow may break through the outer waterproof layer in the design, Through the design of reasonable drainage path, this part of the breakthrough water will be guided into the drainage structure and discharged outdoors to avoid further infiltration into the room.

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

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.

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

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

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.

3.

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, A polyurethane waterproof layer is added to the cross joint between the walls outside the rubber waterstop.

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.

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