EVA drainage board construction details

Construction plan

one When the plate is used for tunnel waterproofing, the scheme of external anti-external paste or external anti-internal paste can be adopted. The design should be selected according to the hydrogeological conditions, the type and use requirements of the tunnel project and the construction conditions.

2. Because the tunnel project is mostly divided into two layers below the structure or underground structure below the water table, the thickness of the plate should not be less than 1.5mm.
3. The base of waterproof layer of tunnel engineering plate should be levelled. The plane waterproof layer should be set with a thickness of not less than 40mm of fine stone concrete, and the facade can be waterproof with 400 grams of non-woven fabric or brick protective layer.
4. Deformation joints, entrances and exits, protruding members of side wall openings, pull-out piles,

The joints such as the ground copper sheet, the interface on the side wall of the bottom plate, and the closure should be mainly treated. The high and low split-level of the underground structure, the elevation and plane, and the junction between the elevation and the elevation are easy to be damaged by friction, and additional reinforcement layer should be set up. Additional reinforcement layers should be installed at the Yin and Yang corners of the ground waterproofing works.

Construction process

1. Construction flow chart

EVA waterproof plate waterproof construction procedure drawing

2. Construction environmental conditions

one Preparation for construction

(1) Before the construction of the waterproof project, the construction unit should pass the joint review of the drawings, understand the design intention, master the node treatment method and technical requirements, and should prepare the waterproof construction plan, equipped with fire fighting equipment, and make technical disclosure to the operator.

(2) should be according to the construction personnel

Equipped with sufficient construction equipment,

Equipped with fire fighting equipment,

Improve labor safety

Facilities.

(1) Through the waterproof pipeline, embedded parts, water drop mouth buried and installed pile head, grounding resistance, equipment foundation and support should be completed in the plate laying, so as to avoid holes in the waterproof layer after the plate laying.

2. Material preparation

The entering plate must be checked before it can be used, and it should be kept by special personnel.

1) The surface of EVA waterproof plate should be flat, no scars, no cracks, no bonding and no holes, and the edge should be neat.

2) The physical and mechanical properties of EVA waterproof board should meet the requirements of GB/T 18173.1-2000.

3) Sampling inspection of incoming materials shall comply with the following provisions:

The same batch of plates, sampling inspection quantity is: more than 1000 volumes, extract 5 volumes; 500-1000 volumes, extract 4 volumes; 100-499 volumes, extract 3 volumes; If the volume is smaller than 100, extract two volumes.

Appearance inspection method:

The extracted sheet is unrolled for specifications, appearance quality inspection, and all indicators reach the standard

When it meets the requirements, it is qualified. If one of them is unqualified, it should be double sampled in the inspected product for reinspection, and all meet the requirements for qualified. When one index is unqualified in the reinspection, the appearance quality of the batch of products is judged to be unqualified.

The physical and mechanical properties of the plate should be checked for tensile strength, elongation at break, low temperature bending,

Resistance to leakage. And make “EVA waterproof board performance approach inspection report”.

4) The storage and storage of EVA waterproof board shall comply with the following provisions:

Should be stored in a cool and ventilated room, avoid rain and sun, away from fire.

3. Basic inspection and treatment

In the construction of EVA waterproof board, the surface of the screed layer is rough and uneven, and the bolt head is outside

Dew has a great impact on the quality of laying waterproof layer, so the waterproof layer base is inspected and tested

Processing, requirements are as follows:

(1) The slope of the screed should meet the design requirements, the flatness should be checked with a 2m ruler, the maximum gap between the surface layer and the ruler should not exceed 5mm, the gap is allowed to change gently, and there should not be more than one place per meter length. The surface of the cement mortar protective layer shall not be loosened, peeled, sanded or husked.

(2) There should be no sharp protrusions such as steel bars and concave pipe fittings on the surface, otherwise it should be cut off, and mortar should be used in the cut part to form a round curved surface, so as to avoid the waterproof layer being punctured.

(3) The Yin and Yang angles of the change of the section of the underground structure or the turning point should be made into an arc, the radius of the arc at the Yin Angle is not less than 10cm, and the arc at the Yang Angle is not less than 5cm.

(3) There shall be no clear water on the base surface during the construction of the waterproof layer, and if there is, the water plugging agent shall be applied.

(4) In case of cracking of the screed layer, when the width of the crack is less than 0.5mm, the sealing material should be applied; When it is larger than 0.5mm, it should be chiseled along the seam and filled with sealing materials.

Third, construction technology

In order to ensure the reliability and ease of construction of the EVA waterproof plate, the geotextile is first laid on the concrete base by mechanical method, and then the plate is affixed to the fixed circular gasket by “thermal bonding” method, so that the plate has no mechanical damage, the construction procedure is as follows:

one Base cleaning

2. The non-woven buffer layer will lay the non-woven fabric on the treated base, lap 5cm, the lap side can be welded with a hand-held welding torch, and the gasket is fixed with a shooting nail, and the non-woven fabric is fixed under the gasket.
3. waterproofing

1) First of all, the natural loose plate is arranged on the base according to the outline, smooth and straight, shall not be twisted, and the lap width meets the requirements.

2) Weld the waterproof plate and gasket together with a hand-held pressure welding gun. 10cm lap edge should be reserved for each side of the waterproof plate to be bonded with the waterproof plate on both sides.

3) A lap edge, take

Weld with a double seam welding machine

Answer. Two waterproof panels

The lap width is

10cm, single weld

Effective welding width

It should not be less than 10mm, the welding is tight, and it should not be welded through.

4) The construction distance between the waterproof plate laying and the concrete lining of the composite lining should not be less than 5m

5) Accurate lofting is carried out before construction to minimize the joint parts, the joint is staggered into a “ding” shape, the joint surface of the welding joint should be wiped clean, no water dew point, no oil and attachments.

6) Hand-held welding gun is used for welding, and visual and mechanical inspection is used for weld inspection

(i.e. using a flat-head screwdriver for detection)

Fourth, the construction process of the bottom plate

1. After the excavation of foundation pit, a foundation pit should be set up to keep the water table in the bottom plate 500mm.

2 For the construction of 100-150 mm thick C15 concrete cushion, the leveling of the construction base must be firm, flat, clean, smooth, sand free, no burrs, no loose, sharp edges and other bulges and pits, uneven or honeycomb, holes must be chiselled or filled with S-shaped mortar; Where there is local water seepage, the leakage or drainage must be carried out first according to the actual situation, to ensure that the base surface must be dry, and the moisture content is not more than 10%. At the same time, it should be noted that the Yin and Yang corners of the leveling layer of the construction base should be made into circular arcs, and the radius of the arc is not less than 100 mm.

3 During construction, first of all, the natural loose waterproof plate is arranged on the base according to the outline, so that the surface of the plate is smooth and straight, the size of the joint is accurate, and the coil is not twisted, wrinkled, skewed, and then the coil is overlapped according to the overlap requirements of the plate construction, and the block by block.

4 The lap width of EVA waterproof plate should be 100mm, and the joints of the upper and lower layers or the adjacent two sheets of coil should be staggered by 300mm. The lap joint should be a brush functional weld, the effective welding width of a single weld should not be less than 10 mm, the welding should be tight, not welding coke welding through, the tensile strength of the double weld should not be less than the strength of the base material. The welding seam should be tested by aeration method. The aeration pressure should not be less than the design value, and the pressure drop should not be less than 10% after 10 minutes. Otherwise, the leaky welding seam should be fully repaired manually.

5 There should be more waterproof panels on each side for overlapping with waterproof panels on both sides.

6 After checking, lay a protective layer of C15 fine stone concrete with a thickness of 50 mm.

Fifth, the construction technology of the side wall

one The compound structure can only be constructed by the “inside and outside” method, and the envelope structure will be filled out first.

2. Lay the non-woven buffer layer, and then fix it under the gasket with nails (2.5 circular gaskets per square meter, arranged according to the plum pattern, the uneven place should increase the fixed point).
3. The waterproof plate is cut to the required length, the base layer is welded with the circular gasket one by one.
4. Weld each lap edge, lap seams should be double welds, weld seams should be tested by inflation method.
5. Each side of the waterproof plate should be more than a certain width to prepare for the roof waterproof plate lap.
6. The details are welded with a hand-held welding gun, and the welding gun is inspected by visual inspection and mechanical inspection (using a flat-head screwdriver).

Seven. When the steel bars of the lining wall are bundled, a temporary baffle shall be installed on the inside of the waterproof plate to prevent mechanical damage and electric spark burning of the waterproof plate.

Six, the construction technology of node parts

The waterproofing construction of node parts mainly refers to the transformation of sections such as the negative Angle and the positive Angle, the closing of the waterproof plate, the treatment of the anti-pulling pile foundation, the treatment of the ground copper sheet, the wall pipe, the equipment base and other prominent parts.

one Construction technology of Yin and Yang Angle:

A The base at the Angle of Yin and Yang should be chamfered or circular.

B Lay the additional layer first. The additional reinforcing layer is fixed by welding. When laying a large waterproof plate, the additional reinforcing edge layer is welded together with the waterproof plate with a hand-held welding gun. Notice that the lapping of the waterproof plate should be located outside the Yin and Yang Angle. When laying the additional layer of EVA waterproof board, the line should be flicked at the additional part, cut the coil, and try to lay it properly.

C When laying, unilateral welding is used to position the plate. The sheet laying should be flat and straight, without twisting and wrinkling.

2. Treatment of the closure of the waterproof plate

The closing of the waterproof plate is the weak link of the waterproof layer, but also the key and difficult point of waterproof construction, and the waterproof layer should be able to meet the needs of the base deformation. And Desheng brand EVA waterproof board from its superior flexibility, elongation and elongation, a good solution to this problem.

Waterproof plate closure in accordance with the principle of strengthening fortification, the use of EVA waterproof board based, self-adhesive coil and waterproof sealant as the supplement of a variety of waterproof materials complementary and multi-channel waterproof installation, to ensure the waterproof effect of the waterproof plate closure.

After the waterproof layer is laid, the sealing of the waterproof plate is pressed tightly with the steel plate closing bar, and the nail is pressed successively with the nail distance of 300-500mm, and then sealed with the self-adhesive coil sealing strip. Roll compaction when laying self-adhesive coil seals.

3. Anti-pulling pile foundation treatment:

A During the construction of the cushion and screed, a slope with a height of 20mm and a width of 150mm shall be left around the uplift pile.

B EVA waterproof plate is laid to the pile foundation.

C After the waterproof layer is laid, press the closure of the waterproof plate with a steel plate closing strip, and press it with a shooting nail in turn, the nail distance is 300-500mm, and then seal it with a self-adhesive coil sealing strip. Roll compaction when laying self-adhesive coil seals.

D After inspection, lay a protective layer of 50 mm thick C15 fine stone concrete.

4. Ground copper and wall pipe, equipment base and other protruding parts processing

The treatment method of ground copper strip is basically the same as that of wall pipe, equipment base and other protruding parts.

A EVA waterproof plate is laid to the ground copper strip.

C After the waterproof layer is laid, press the closure of the waterproof plate with a steel plate closing strip, and press it with a shooting nail in turn, the nail distance is 300-500mm, and then seal it with a self-adhesive coil sealing strip. Roll compaction when laying self-adhesive coil seals.

D After inspection, lay a protective layer of 50 mm thick C15 fine stone concrete.

Seven, waterproof layer damage inspection and repair

Careful construction of the waterproof layer is necessary, but the inspection of whether the waterproof layer is damaged is also necessary. Because of damage is sometimes inevitable, such as the ongoing plastic heat sealing machine suddenly encountered a power failure can not move forward, this time will soon be shut down when the waterproof layer burned a hole; Do two lining steel bar top breaking, welding slag burning through, etc. If damage is detected on the waterproof layer, obvious marks must be made immediately so that the damage can be repaired one by one without omission. Check whether it is good after making up.

Requirements:

1 The patch must not be too small, not less than 7CM from the edge of the damage hole;

2 The patch should be cut with rounded corners, not sharp corners of squares, rectangles, triangles, etc.