What requirements should be met for the laying of waterproof panels

Construction specifications for waterproofing panels.

Preparation before laying:

Ground treatment. Sweep the paved surface.

The substrate is required to be flat.

The soil is solid. It can't be uneven.

cracks, etc. There can be no sharp objects.

Stones, wires, sticks, etc., turf within the impermeable area, trees.

The roots should be removed, and weeds should be sprayed with herbicides.

On the contact surface with the membrane, lay a small particle size sand or clay layer as a protective layer, a protective layer.

The thickness of the coverage should not be less than.

Laying method: lay along a certain direction, at the same time do not pull too tight, should leave a certain amount of expansion and contraction, to adapt to the deformation of the matrix.

When the waterproofing sheet is laid.

It is necessary to adjust the direction of each unit.

In order to facilitate the welding of two units. Pick up.

After the waterproofing plate is laid.

It should be pressed with a sandbag.

To prevent the wind and sand from affecting the edge of the next step. Weld.

Waterproof plate welding.

Joint treatment is a key procedure in construction.

Generally, hot welding is used. Law. pe

Membrane-bonded surface heat treatment.

Melts the surface.

Then pass the pressure.

Make it fuse. into one.

For laying a good waterproofing sheet.

The edge seams must be free of oil stains.

Water. Dust. Wait.

Before welding, the two sides of the seam should be adjusted. PE monofilm.

Make it lap a certain width.

Degree. The lap width is generally.

and flat. No creases.

Welding is carried out using a dedicated welding machine.

Weld quality inspection.

The detection method should be inflatable method and laboratory test.

Spark test or ultrasound can also be used.

Acoustic sounding.

The testing equipment adopts pneumatic detector and vacuum detector.

Weld quality requirements.

The length of the double slit inflation is.

The inflation pressure between the double welds is reached.

Keep. 1-5min, no significant drop in pressure is qualified.

to single welds and.

T-junctions and repair points should be taken.

Checkered in. Vacuum detection is performed.

Vacuum pressure greater than or equal to.

Keep. 30s, soap liquid does not foam. is eligible.

Indoor testing. The tensile strength of the weld should.

Accurate lofting is carried out before laying, and the size of one ring of the waterproof board is determined after the standard line is ejected for trial laying, so as to minimize the joints.

The waterproof board should be laid without nails, and it is advisable to lay in the order from bottom to top, and the tightness should be moderate and leave a margin (the ratio of the actual paving length to the arc length is 10:8), and the inspection should ensure that the entire area of the waterproof board can reach the surrounding rock.

Use a nail with a thermoplastic round washer to fix the buffer layer on the base layer smoothly and straightly, the buffer layer lap width is 50mm, and the hot air welding torch can be spot welded, each waterproof board is arranged with an appropriate number of washers, each row of washers is about 1000px from the edge of the waterproof board, and the gasket spacing: 2000px on the side wall, 2 3 washers m2, 1000px on the top, 3 4 washers m2.

The lap width of the two waterproofing panels should not be less than 100mm.

When laying in the ring direction, the wall should be arched first, and the lower waterproofing plate should press the upper waterproofing plate.

The lap joints between the waterproof plates should be hot-melt welded by automatic crawling heat sealers with double welds, temperature regulation and speed regulation hot wedge functions, and hand-held welding guns should be used for detail treatment or repair, and the effective welding width of a single weld should not be less than 10mm, and the welding should be tight, and no coke welding should be carried out.

The longitudinal lap joint and the circumferential lap joint of the waterproof board, in addition to the normal construction, should be covered with a layer of waterproof board of the same material and welded with heat welding.

The lap form of the plastic waterproof board with more than three layers must be a "T" joint.

Reserve at least 1500px lap allowance at the edge of the coil laid in sections, and effectively protect the edge of the reserved part.

10. When binding or welding steel bars, measures should be taken to avoid damage to the coil.

11. When the concrete is vibrating, the vibrating rod shall not touch the waterproof board to prevent the waterproof board from being damaged.

Hope the above is of some help to you.

1. The most important thing for coil materials is that the base layer must be handled clean and thorough, kept dry, and the additional layer must be done well.

2. The base layer of the coating film should also be treated clean and thorough, and the number of brushing times should be sufficient and the thickness should be guaranteed.

3. Do closed water test in strict accordance with the requirements of the specification.

4. Make a protective layer in time after waterproof acceptance.

Generally speaking, after the tunnel is excavated and the initial support is carried out, the shotcrete base surface is still quite rough, locally uneven, and there may be exposed bolts. If the waterproofing membrane is laid directly, its waterproof quality is difficult to guarantee. Therefore, before the waterproof board is laid, the base surface should be carefully inspected and treated, and the flatness should be tested with a ruler, and the main points are as follows.

1. Flatness of shotcrete base: side wall D l 1 6, vault 1 8. Wherein: l is the distance between two adjacent convex surfaces of shotcrete; d is the depth of concave between two adjacent convex surfaces of shotcrete.

2. There shall be no sharp protrusions such as steel bars and protruding components on the base surface. If there is a sharp protrusion on the base surface of the rough and scattered coiled rock, it must be cut off, and the cut part must be smoothed with mortar to avoid puncturing the waterproof layer.

3. The wax yin angle at the tunnel section change or turn should be wiped into an arc of r 5cm.

4. During the construction of the waterproof layer, there shall be no open water on the base surface; If there is open water, it should be plugged or drained.

When we take the waterproof board to lay always feel powerless, some places do not pay attention to the good, the result of the effect of the paving is not ideal, the laying of the waterproof board or to ask professional workers to do, if you get it you have to have a few points of attention, a lot of details in the process of laying need to pay attention to, so as to better ensure quality and quantity in the laying.

1) During the laying process, a lap allowance of not less than 20cm should be reserved at the lap joint of the two waterproof boards, and the weld width of the waterproof board should be 10 cm-20 C7R.

2) When laying the waterproof board, the waterproof board should be kept to a certain degree of relaxation, and the relaxation degree is subject to the fact that the palm of the hand sticks the waterproof board on the rock surface without a sense of tightness; When laying in the circumferential direction, attention should be paid to the longitudinal perpendicular of the waterproofing plate to the longitudinal direction of the tunnel.

3) When laying the tarpaulin, use a special plastic gasket, and try to use steel nails, screws and plastic expansion pipes to fix the waterproof plate on the base surface according to the different conditions of the base surface.

4) The weld should be completed as soon as possible, so as to minimize the number of interruptions and shutdowns, and avoid unnecessary repairs.

5) When laying the waterproofing board, the lap margin of 1 m-2 m in the next section should be reserved.

6) When the longitudinal weld of the waterproof board coincides with the tracing weld, first cut the edge of the welded weld about 100 cm, and then weld the overlapping part of the two welds with an air welding gun.

7) Before the welding, the heat sealing welding machine is preheated, and the temperature and creeping progress are set, and the temperature is generally set at 3. (The + position can be operated when the indicator light turns from green to red, and the temperature or speed should be adjusted at any time to control the twist according to the hot melt and clear condition of the seam during the welding process.)