What might cause the waterstop to leak?

 There are many times when Chengdu waterstop is used in life and construction projects. We can understand its basic function - waterstop through the name. Due to the use environment of the waterstop, the substances are different. There may be water leakage during use. What is the reason? We together look.

The selection of the Minka waterstop should be determined comprehensively according to the importance level of the structure, the deformation amount of the deformation joint and the water pressure, the application (application) of the waterstop, the working environment, economic factors and other conditions. What are the reasons for the water stop leaking?

1. Improper material is easy to damage

The material of the existing back-mounted waterstop is soft and hard. The "claw edge" of the back-mounted waterstop processed with the former is thin and soft, and the "claw edge" is easily overwhelmed by the coarse aggregate when the lining concrete is poured, causing it to lose or reduce the water blocking efficiency; For stick-type waterstops, long gauges are easily damaged during storage and transportation, while short gauges need to be spliced ​​during construction. Waterstop damage and splicing are hidden dangers of water leakage in construction joints.

2. Only plug the water without draining the water

All groundwater that may leak through the construction joints has passed through the waterproof layer. If this part of groundwater is provided with a downward drainage channel, the chance of its leakage along the construction joints will be reduced. In fact, for the construction joint waterproofed by the middle-buried waterstop, the gap between the waterstop and the waterproof layer has some water seepage and drainage capacity, which will help the waterproofing of the construction joint.



The existing back-stick waterstop is only blocking but not draining in terms of design guidelines. The seepage water passing through the waterproof layer will hold pressure around the back-mounted waterstop and wait for seepage. If the back-mounted waterstop itself has defects or construction quality problems, water leakage in the construction joints is inevitable.

3. The waterstop on the top of the cave is not dense

The existing back-mounted waterstop relies on the claw edge to be implanted into the concrete to prolong the water seepage process and increase the water seepage resistance to waterproof. At the top of the tunnel, it is difficult to pour and vibrate the lining concrete, and the corners and claw edges are not easy to be filled with concrete; when the initial support profile of the tunnel is not regular and the top of the hole is over-excavated, the back-mounted waterstop Accurate placement and dense filling at the top of the cave are even less guaranteed.

Only by taking effective technical measures, that is, the back-mounted waterstop can be applied to the waterproofing of the construction joints at the top of the tunnel.

The random joints of waterstops appear on the construction joints in the following situations: First, for the convenience of construction, when pouring the lining foundation, the waterstops of about half the length of the construction joints are pre-buried at the construction joints on both sides of the tunnel. The waterstops on both sides are overlapped at the top of the tunnel; the second is that the initial support profile of the tunnel becomes larger, and the length of a single waterstop provided according to the normal specifications cannot meet the length requirements of the variable-length construction joint, so the waterstop has to be carried out during the construction. take longer.

Save the cost of construction joint waterproofing materials, and use several short sections of waterstop to connect the length to complete the waterstop of a construction joint. Undoubtedly, the joint of the waterstop is a hidden danger of water leakage in the tunnel construction joints.

4, the shape is not reasonable enough

The unreasonable shape is manifested in two aspects: one is that the depth of the effective water-stop edge is insufficient, and the coarse aggregate at the corner is difficult to enter, and the corner is not easy to be compacted; There is material consumption without a significant increase in seepage (resistance) along the way.

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