The enclosed linear waterproof form adopted by the external precast exterior wall panel mainly has three waterproof measures.

However, for the waterproof measures on the outer side of the wall panel, the open line waterproof does not adopt the form of glue, but uses the curtain rubber strip embedded in the wall panel at one end and extending out of the wall panel at the other end to overlap each other to play the waterproof role, At the same time, the outer rubber strip is provided with a stainless steel air guide groove at a certain distance, which plays a role in balancing the internal and external air pressure and drainage.

PCF panels) with internal casting and external hanging mainly adopt the outer drainage cavity and glue, and the inner side relies on the self-waterproof joint waterproofing form of cast-in-place concrete.

The disadvantage is that the accuracy requirement is very high during construction.

2.

The waterproof form of open line waterproof is basically the same as the two waterproof measures of closed line waterproof on the inner side, namely, the grooved decompression space and the compression type waterproof rubber strip on the inner side.

Several forms of joint waterproofing treatment for precast exterior wall panels are introduced.

The movable wall panels further increase the difficulty of waterproof of wall panel joints.

The waterproof structure of closed line waterproof adopts the method of combining internal and external waterproof and unblocking.

Its advantages are that the construction is relatively simple and fast, but its disadvantages are that the waterproof quality is difficult to control, and the cavity blockage occurs from time to time.

The precast exterior wall panels (i.e.

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

During construction, workers do not need to apply glue on the outside of the wall panel, and the construction measures such as scaffolding or hanging basket are omitted, which is more safe and simple.

3.

Fixing Socket Waved End

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

The disadvantage is that the product protection requirements are high.

Once the embedded rubber strips are damaged, it is difficult to replace them, and the cost of weatherproof rubber waterstops is relatively high.

The performance requirement of the weatherproof waterproof adhesive used is relatively high, not only has high elasticity and aging resistance, but also the service life requirement is not less than 20 years, The cost is relatively high, and the quality requirements for the construction of structural adhesive are relatively high, which must be operated by a professional and experienced construction team.

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.

These joints can easily become channels for water seepage.

A drainage pipe is set on the waterproof silica gel of the outer wall every 3 layers, which can effectively guide the rainwater seeping into the decompression space to the outside.

The joint waterproofing forms of precast exterior wall panels commonly used in practical application are mainly as follows: 1.

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

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

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

The wall plate dislocation cannot be greater than 5mm, otherwise the water stop rubber strip cannot be pressed.

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

The design concept of precast building waterproof precast building is to divide the structure of the building, such as wall panels, columns, beams, floors, stairs, according to certain specifications, and then carry out production prefabrication in the factory, and then transport to the site for assembly.

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

In addition, in order to resist the influence of earthquake force, some precast and precast buildings have their exterior wall panels designed as an exterior wall that can be moved within a certain range.

The outermost part is made of high elastic weatherproof silicone, the middle part is the decompression space formed by the physical cavity, the inner part is made of waterproof rubber strips embedded in the concrete to press each other up and down to achieve the waterproof effect, and a polyurethane waterproof layer 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 tiny gaps that may be caused by the staggered movement of rubber waterstops.

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

As the components and fittings are assembled on site, a large number of assembly joints will be left.

In addition to the concrete structure waterproof measures, the waterproof system of the entire precast wall panel can be truly watertight only by using rubber rubber waterstop and multi-component weatherproof waterproof adhesive.

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

Therefore, precast precast buildings have certain inherent weaknesses in waterproof.

In short, it is necessary to consider the possibility that a certain amount of water will break through the outer waterproof layer during the design, and guide this part of water that breaks through into the drainage structure through the design of a reasonable drainage path, and discharge it outside, Avoid its further penetration into the room.

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

Construction points of waterproof treatment of precast exterior wall panel joints At present, the waterproof treatment technology of precast exterior wall panel joints is relatively complex in technology, so there are also relatively large construction difficulties during construction.

▲ Click on the picture to register for the engineer conference Source: Waterproof Material Investment Network (ID: fsclzs_com) Because the precast exterior wall is assembled in blocks, it is inevitable to encounter the waterproof treatment of the connection joints, so we must attach great importance to the treatment of the waterproof joints of the precast exterior wall.

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