1. Thread steel for bellows is not used alone. It must also be equipped with supporting anchors. First, the steel at both ends of the bellows is 10-20 cm shorter than that at both ends of the bellows. Bellows: 40 * 2, 50 * 2 (mm) Bellows: When the waterproof layer collapses, micro-crack water and drainage facilities block or fail, prestressing may be from corrosion, the bottom of the bellows is in the protective barrier of the pre-stressed concrete steel structure, which can prevent harmful substances, steel pipe corrosion. It has pollution-free, hard-working performance, can greatly improve the fatigue resistance of components, so as to ensure that the pre-stressed structure has good durability.

　　2、螺旋桿當螺旋鋼絞線滾入波紋管時，將螺旋桿放入鋼絞線末端，并將小鋼管焊接起來，以固定螺旋桿，避免其滑脫;有些施工是在垂直插入時準備將混凝土螺桿鋼倒在螺桿鋼上。螺旋鋼筋的作用:澆注混凝土時，可使螺紋鋼與整個混凝土的接觸面變大，并能更牢固地結合在一起。螺旋桿規格為:D×D×n×L=120×12×6×300(mm)。螺旋桿的規格根據施工側的設計而有所不同。螺旋桿一般由Q235熱軋帶肋鋼筋制成，有的由10mm圓鋼制成。

　　2. When the spiral steel strand rolls into the bellows, the spiral rod is put into the end of the steel strand, and the small steel pipe is welded together to fix the spiral rod and avoid its slippage. In some construction, concrete screw steel is ready to be poured onto the screw steel when it is inserted vertically. The function of spiral reinforcement: When pouring concrete, the contact surface between the threaded steel and the whole concrete can be enlarged, and it can be more firmly combined. The specifications of the screw rod are: D X D X n X L = 120 X 12 X 6 X 300 (mm). The specification of screw rod varies according to the design of construction side. Spiral rods are generally made of Q235 hot-rolled ribbed steel bars, and some of them are made of 10mm Round steel.

　　3、將精軋螺紋鋼板墊板和精軋螺釘螺母在波紋管和螺釘加固后固定在與鋼板螺釘相匹配的一端，再擰上螺母。墊板和螺母的作用:起到張緊和螺桿固位的作用，在張緊鋼筋時用錨釘固位。

　　3. Fix the finish-rolling threaded steel plate pad and the finish-rolling screw nut at the end matching the steel plate screw after the bellows and bolts are strengthened, and then screw the nut on. The role of pad and nut: play the role of tension and screw retention, in tension of steel bars with anchors.

　　4、排氣管的一端的排氣管波紋管密封,將另一端另一端的螺紋鋼筋,決不能超過完成的鋼筋,排氣管的影響:當鑄造可以排除空氣波紋管,波紋管在真空狀態,確保沒有空氣的混凝土,混凝土澆筑的質量保證。

　　4. Sealing the bellows of the exhaust pipe at one end of the exhaust pipe can not exceed the reinforced bar at the other end. The influence of the exhaust pipe can be eliminated when casting. The bellows are in vacuum to ensure the concrete without air and the quality assurance of concrete pouring.