The joint repair of heat preservation spiral steel pipe plays an important role in the construction acceptance, so the joint repair must be in accordance with the specification, and the spiral steel pipe joint shall be confirmed to be qualified through X-ray flaw detection, and the sundries at the joint and the joint repair sheath shall be cleaned. Measure the length of the joint to be patched. The length is generally less than or equal to 50cm. Wrap the leather sheath around the joint to make the length of the joint at both ends uniform.

　　用寬150mm的熱縮帶把搭接處纏繞一周，用小火依次將搭接的兩層熱縮帶烘烤膠層微化并搭接固定住，再將膠層已烘烤過的壓蓋居中扣在搭接縫上，然后用中火來回均勻烘烤壓蓋直壓蓋與熱縮帶完全粘接無翹邊和氣泡，加熱過程中可用手套或壓滾撫平壓蓋使其與熱縮帶緊密粘接。

　　Wrap the lap joint with a 150 mm wide heat shrinkable tape for one week, bake the two layers of heat shrinkable tape with a small fire in turn until the adhesive layer is slightly modified and fixed, then buckle the baked gland of the adhesive layer on the lap joint in the middle, bake the gland evenly back and forth with a medium fire until the gland and the heat shrinkable tape are completely bonded without warping and bubbles, and use gloves or rolling to smooth the gland during heating Heat shrinkable tape is tightly bonded.

　　壓蓋壓緊后，從熱縮帶的中部開始，烘烤與套管搭接的一邊，烘烤時應從底部開始，并遵循由下向上、由里向外的烘烤規則，以避免氣泡產生；

　　After pressing the gland, bake the overlapping side of the sleeve from the middle of the heat shrinkable belt, starting from the bottom and following the baking rules from bottom to top and from inside to outside to avoid bubbles;

　　調整噴火焰長度，先沿熱縮帶中部環向均勻加熱，中間收縮完后再依次加熱兩端，加熱過程中噴應來回移動以保證熱縮帶不局部過熱。加熱收縮時應仔細觀察熱縮帶邊沿是否有熱熔膠溢出。待收縮完畢后，再次檢查熱縮帶和壓蓋是否有翹邊和氣泡存在，若有應及時修補排除氣泡保證熱縮帶和壓蓋平整。

　　Adjust the length of the flame, heat uniformly along the central ring direction of the heat shrinkable belt first, and then heat the two ends successively after the middle shrinkable. During the heating process, the spray shall move back and forth to ensure that the heat shrinkable belt does not overheat locally. When heating and shrinking, carefully observe whether the edge of the heat shrinkable belt overflows with hot melt adhesive. After the contraction, check whether there is edge warping and bubble in the heat shrinkable belt and gland again. If there is, repair and remove the bubble in time to ensure that the heat shrinkable belt and gland are flat.

　　確定熱縮帶密封后，把黑白料按照1混合在容器中，迅速倒入保溫口中，然后封住口。直埋保溫管現場補口有哪些方法？

　　After confirming that the heat shrinkable tape is sealed, mix the black and white materials into the container according to 1, quickly pour them into the insulation mouth, and then seal the mouth. What are the methods for field joint repair of directly buried insulation pipe?

　　確定熱縮帶與熱縮套的搭接長度。截取熱縮帶的長度 。熱縮帶的一端裁去倒角×mm。

　　Determine the lap length of heat shrinkable tape and heat shrinkable sleeve. Cut off the length of the shrink zone. One end of the heat shrinkable tape shall be chamfered × mm.

　　將熱縮帶膠層向內包覆在接口處，并保證熱縮帶在搭接處居中位置 。先用小火依次將搭接的兩層熱縮帶烘烤膠層微化并搭接固定住，再將膠層已烘烤過的壓蓋居中扣在搭接縫上。

　　Wrap the adhesive layer of heat shrinkable tape inwards at the joint, and ensure that the heat shrinkable tape is in the middle of the lap joint. First, bake the two layers of heat shrinkable tape with low heat to the glue layer micromation and fix the overlap, then buckle the baked gland of the glue layer on the lap joint.