Construction process of heat shrinkable sleeve

  As we all know, the construction operation of any product can effectively ensure the later use quality and performance of the product
Therefore, when we construct the heat shrinkable sleeve, we must follow the specified construction operation process, so as to effectively avoid some unnecessary troubles in the later use while ensuring the product construction quality
1
After the operation pit is excavated, take out the heat shrinkable sleeve and put it together with the isolation film on the pipeline for standby
2
Align and fix the two pipes to be connected, and the gap shall not be greater than 15mm, and the gap shall be reduced as much as possible
3
The soil and sundries on the surface of the pipe body shall be removed with water, and the cleaning range shall exceed the width of the heat shrinkable sleeve by 200mm
4
Preheat the pipe wall to be covered on both sides of the joint to 70 & deg; C
sand the pipe wall to be bonded at the joint along the circumferential direction with a steel wire brush
5
In the front screw groove of the pipeline to be connected close to the interface, 200mm-250mm away from the transverse notch, use the equipped rubber strip to heat and fill the uneven part at the bottom of the groove and the junction of peak and valley to form a water blocking isolation belt with a length of 80mm-100mm
Or divide the prepared water blocking strip into four sections, place two sections in the front screw groove of each pipe to be connected close to the interface, with an interval of 4-5cm, insert and compact one to form an interval, and fill the interval with the prepared sealant, which is suitable for dn200-dn400 steel management reinforced polyethylene cuttlebone rotary bellows; In a spiral groove, 200mm-250mm away from the transverse notch, place the allocated rubber strip on the uneven part of the groove bottom and the junction of peak and valley in sections to form a water blocking isolation pipe with a length of 80mm-100mm, which is suitable for dn500-dn700 steel belt reinforced polyethylene spiral bellows; Steel belt reinforced polyethylene spiral bellows with diameter above DN800 adopts externally welded electrothermal melting belt and internally sealed by injection welding gun surfacing method
6
Mark both sides and both sides of the pipe interface with steel tape and marking pen according to the width of the heat shrinkable sleeve, move the heat shrinkable sleeve to the mark, align it, take out the isolation film, heat it evenly along the circumference from the middle (the middle pipe orifice shall be fully shrunk in place), and then move it evenly to both ends for heating respectively after it is fully shrunk
After the overall heating is completed, roll it with a roller to eliminate bubbles, The heat shrinkable sleeve shall be reheated with low fire, and the fusion lap shall be rolled to eliminate bubbles
To ensure that the hot melt adhesive fully melts and overflows, forming a good bonding
Note: the caliber of the gun is 35mm-40mm
7
After installation, check with finger pressing method, press a small pit with your finger, and the small pit will slowly return to its original state, indicating that the burning temperature is in place
8
After the joint is completed, the pipe can be moved only after the joint is cooled to normal temperature
If the temperature of the joint is too high due to direct sunlight and other reasons, it can be moved only after effective cooling (such as watering)
9
Backfill as soon as possible after installation, especially in summer
If the joint cannot be backfilled in time, it shall be covered to avoid direct sunlight, which will deform the joint and seriously affect the installation quality
Note: it must be backfilled first and then the inspection well shall be built
The above is the detailed construction operation process of the heat shrinkable sleeve
Operating in strict accordance with the above specified methods can not only effectively improve the construction efficiency of the heat shrinkable sleeve, but also ensure the service quality of later products, promote the performance, and effectively prolong the service life of the pipe
From: http://www
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