组合式锚杆优点
 ①确保注浆饱满
 ②施工方便
 ③可利用排气管的回浆判断注浆是否饱满
 ④锚杆注浆盲区部分热镀锌
 ⑤锚杆主体——螺纹钢
 ⑥锚杆主体保用100年
 ⑦垫板、螺母热镀锌，避免因二次喷浆覆盖不完全而腐蚀
 ⑧端头用特制的涨式锚头——预应力锚杆

中空注浆锚杆缺点
 ①除了没有钻头，结构上中空锚杆与自进式锚杆相同
 ②中空内孔进浆，内孔不仅太小，而且内表面凹凸不平，砂浆通过难
 ③上倾角时，注浆方式不符合砂浆和空气固有本性
 ④材料变“硬”、屈服性能变差、延伸率降低
 ⑤注浆盲区
 ⑥因砂浆通过难，所以，很容易产生堵浆后果
 ⑦堵浆后，注浆是否饱满无法判断

组合式锚杆特点：
排气管材料为尼龙。
中空杆体为50CM
价格大约33元/米。（以3.5米锚杆）

Advantages of modular anchor
 ① ensure full grouting
 ② convenient construction
 ③ exhaust pipe can be used to judge grouting paste it back to full
 ④ blind part of the hot dip galvanized bolt grouting
 ⑤ bolt main - rebar
 ⑥ bolt main 100-year warranty
 ⑦ plate, hot dip galvanized nuts, to avoid the incomplete coverage of secondary spray corrosion
 ⑧ ends up with a special head-type anchor - Anchor

Hollow grouting anchor defects
 ① In addition to not drill, structural hollow bolt into the anchor with the same self-
 ② hollow bore into the pulp, the hole is not only too small, and the inner surface of rugged, mortar through the difficult
 ③ on the dip, the mortar and grouting a manner inconsistent with the inherent nature of air
 ④ material change "hard", yield worse performance, lower elongation
 ⑤ grouting blind
 ⑥ through difficult because of mortar, so can easily lead to the consequences of blocking plasma
 ⑦ After plugging slurry, grouting can not determine whether the full

Combined Anchor Features:
Exhaust pipe material is nylon.
Hollow rod is 50CM
Cost about 33 yuan / m. (To 3.5 m bolts)