What is the lap length of the joint when the basement waterproof steel plate is welded

There is no specific provision on the lap length of the water-stopping steel plate in the national specification, but it is required that the butt or lap joint must be fully welded. Because the lap length of the waterproof steel plate is an additional measure to ensure that there is no leakage at the concrete joint. For buildings with waterproof requirements, the state stipulates that the underground part should be at least a secondary waterproof requirement, in the normal waterproof design, there are already measures, there are at least two waterproof technical measures, and then set up additional measures is to set up another waterproof measure.

As long as it can ensure that there is no leakage, it is fine.

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The lap welding of the waterproof steel plate is 10cm

Welding requirements for waterproof steel plates:

Positioning, fixed joint welding, inspection and acceptance.

Positioning of water-stopping steel plates: The water-stopping steel plates should be placed in the middle of the exterior wall, and the bends at both ends should be towards the waterfront surface. After the horizontal elevation of the horizontal steel plate waterstop is determined, the upper mouth of the steel plate waterstop should be pulled through according to the elevation control point of the building to keep its upper mouth straight.

The steel plate is fixed by steel bar welding, and the top die rod is fixed by diagonal steel bar welding. Weld short steel bars at the lower mouth of the steel plate waterstop to support the steel plate, and its length should be subject to the thickness of the steel mesh of the concrete slab wall, and should not be too long, so as to prevent the formation of water seepage channels along the short steel bars.

The center of the short steel bar should be welded with a waterstop to block the water seepage route. Short steel bars are generally not spaced very wellSet up one at about 2 000mm, the spacing is too small to increase the cost and workload, the spacing is too large, the steel plate waterstop is easy to bend, and the concrete is easy to be deformed by vibration when pouring concrete.

The joints of the steel plate are welded, the lap length of the two steel plates is not less than 50mm, both ends should be fully welded, and the height of the weld is not less than the thickness of the steel plate. The electrode should be made of knot 420 structural steel electrode. Before welding, test welding should be carried out and the current parameters should be debugged

If the current is too large, it is easy to burn or even burn through the steel plate; The current is too small and the arc is difficult, and the welding is not firm.

The lap length of the waterproof steel plate is 5 cm to 10 cm.

1. When lapping, it should be kept flat and dry, and the dust on it should be cleaned before installation.

Second, in the lap joint, the parallel lap method should be adopted, and there can be no break point in the middle of the lap.

The joints should also be reinforced with steel nails. Third, the overlap of the two waterproof steel plates should not be less than 5 cm, and they are double-sided full welding.

Technical Highlights:

1. When carrying out the construction of the water-stopping steel plate, the water-stopping steel plate should be prevented from being in the center line of the wall, and it should be fixed, and the later construction should be ensured, and the water-stopping steel plate should not be moved, otherwise the steel plate should be affected to play the greatest role. Note that it is necessary to fix the opening of the waterproof steel plate towards the water surface.

2. When carrying out the welding work between the two steel plates, it is necessary to ensure that the welding is full and the double-sided welding should be realized. Moreover, the lap of the waterproof steel plate should ensure that the distance cannot be less than 20mm. In the process of welding, it is necessary to ensure that the steel plate is fixed firmly and cannot be misplaced.

3. When the waterproof steel plate is supported and connected, the small steel bar should be welded on the main reinforcement. And if it is a water-stopping steel plate, it must pass through the column stirrups.

In this case, the stirrups that pass through are disconnected, and then the open bars are made and spot welded to the steel plate.

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What is the length of the welded lap of 3mm thick, 300 high waterproof steel plate? On what basis.

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Welding wide lap stockings imitation, no specific specification requirements. We generally press 20mm double-sided welding, according to GB50141-2008 stipulates that the lap length of the metal waterstop shall not be careless than that of the pro-hello, 20mm, and double-sided welding must be used. Hope it helps.

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The width of the waterproof steel plate is 300mm, and the specifications of the waterproof steel plate meet the requirements, generally 3 thick waterproof steel plates, the width is not less than 300, and the folding edge is 30-50, and the lap of the two waterproof steel plates should not be less than 50mm, and must be fully welded on both sides.

The concrete interface of the fixed waterstop is kept flat and dry, the interface scum dust and sundries are removed before installation, and the waterstop strip is fixed on the determined installation site with steel nails or glue. However, the face with grouting pipe must be pressed on the interface of the original concrete.

When the waterstop strip is connected, the parallel lap joint method is adopted, and the break point shall not be left in the middle, and the waterstop strip at the junction is strengthened and fixed with steel nails, and the reserved grouting connecting pipe on the waterstop strip is sleeved into another waterstop strip on the equal to connect the two tees.

According to the length of the installed waterstop strip at about 30 meters, a tee is installed, and the two ends of the tee line are about one end inserted into the waterstop strip, one end is inserted into the grouting connecting pipe, and the other T-shaped end should be inserted into the spare grouting to prevent the use of chemical slurry to stop water when the gap leaks water.

The grouting connecting pipe in the connected waterstop strip must be firmly bonded with the tee connector, and the grouting pipe of the installed differential pure water strip must be completely unobstructed. The spare grouting pipe installed on the tee should be placed in the direction of the interior wall.

Construction points

The steel plate waterstop (waterproof steel plate) is to pre-bury a 300mmx3m steel plate when pouring the lower layer of concrete, of which 10-15cm of the upper part is exposed outside, and the steel plate of this part is poured into it together when pouring concrete next time, so as to prevent the outside pressure water from penetrating.

Therefore, the waterproof steel plate has high requirements for the false height of the welding joint, and there can be no leakage, which affects the waterproof performance. When the water-stopping steel plate passes through the column stirrups, the stirrups that have been passed through can be broken and made into open hoops, which are welded on the steel plate. The "opening" of the water-stopping steel plate faces the water.

Pro, the width of the waterproof steel plate is generally 30 cm, and the thickness of the waterproof steel plate should reach 3 mm, and the beam is sensitive when the two waterproof steel plates are lapped, the spacing can not be less than 50 mm, and the double-sided welding should be ensured in place. At the same time, the fixed concrete interface should be kept clean and dry, and the floating dust, debris and so on the surface should be removed before installation. Next, the method of parallel lap is adopted, and there can be no break point in the middle, and the macro slag is strengthened and strengthened through steel nails.

The lap length is generally between 50 and 100 mm, and the key is that the details of the welding should meet the requirements of the specification, because of the role of the lap length of the waterproof steel plate, it is necessary to ensure that the concrete interface can not leak the problem, so as to achieve the role of waterproofing and ensure that there is no leakage.

Basement waterproof steel plate welding lap length?

Construction BAI requirements.

1. Every effort should be made to ensure that the waterproof steel plate is on the middle line of the wall;

2. The welding back connection between the two DAO steel plates should be full and double-sided welding, and the steel plate lap should not be less than 20mm;

3. The treatment of the corner of the wall, 1. Bending the whole steel plate;

2. T-shaped welding;

3. 7-figure welding.

4. The support welding of the waterproof steel plate can be welded on the main reinforcement with small steel bars;

5. When the waterproof steel plate passes through the column stirrups, the stirrups can be broken and made into open hoops, which are welded on the steel plate.

6. Water-stopping steel plate"opening"Towards the water.

It is used in the waterproofing of underground structures, dams, reservoirs, swimming pools, roofs and other building materials, expansion joints and deformation joints of buildings.

Hello, the lap length of the waterproof steel plate is not less than 20mm, I hope it can help you. Thank you.

2. There is no specific specification for the connection and fixation of the waterproof steel plate, as long as the purpose of waterproofing is achieved.

3. In principle, the longer the waterproof steel plate, the better, but for the convenience of transportation, it is generally not less than 3m, because one more connection will be more risk.

4. In order to prevent the structural reinforcement from being damaged, it is best not to weld the waterproof steel plate directly on the structural steel bar, but use a small steel bar head to weld and position, so that the waterproof steel plate can not be offset in the concrete pouring.