Description

Self Drilling Pipe Roof System

Pipe roofing is mainly used in tunnel projects with soft and broken surrounding rock, such as high-way and railway tunnels, subways, hydropower station tunnels and other underground projects. Tra- ditional pipe roofs generally are seamless steel pipes, and common specifications are 76×6, 89×5, 108×6, 127×6, etc. The construction technology of traditional pipe roofs is drilling the hole, extracting drill rod, inserting pipe roof, and finally grouting. Holes collapse may occur during construction in weak surrounding rock, which makes it difficult to insert pipe roof, so casing is required.
Self drilling pipe roof system consists hollow anchor bar, coupling and drill bit, which can be drilled and grouted at one time. Self drilling pipe roof system can replace traditional pipe roofs in a variety of easily collapsed formations, and common specifications are R5l, T76, T103, etc.

During application, the biggest influence on the service life of anchor bolt is the corrosion of surrounding environment, so it is especially important to have anti-corrosion anchor bolt. To meet customer’ s demand, Hengnuo specializes in providing a variety of anti-corrosion anchor bolt systems, such as hot dip galvanizing anchor bolt, epoxy coating anchor bolt, the duplex (multiple) coating anchor bolt combining the above two processes. Self driling anchor system is a new method that integrates drilling, grouting and anchoring functions together. lt is especially suitable for construction in loose soil, broken rocks, pebble layers and other collapsible geological conditions. in order to give full play to the advantages of self drilling anchor bars, our company has developed the first domestic drilling rig specially used for self drilling anchor bars after more than one hundred investigations and tests. The special drilling rig for self drilling anchor bars has the characteristics of high safety performance good anchoring effect, and high construction efficiency, which can greatly save the overall construction cost.

Specification

Size	O.D(mm)	I.D(mm)	Ultimate Load(KN)	Yield Load(KN)	Weight(kg/meter)
R25N-14	25.0	14.0	200	150	2.3
R32L-22	32.0	22.0	220	180	2.8
R32N-21	32.0	21.0	280	230	2.9
R32N-18.5	32.0	18.5	280	230	3.4
R32S-17.5	32.0	17.5	360	280	3.5
R32S-15	32.0	15	360	280	4.1
R38N-21	38.0	21.0	500	400	4.8
R38N-19	38.0	19.0	500	400	5.5
R51L-38	51.0	38.0	550	450	6.0
R51L-36	51.0	36.0	550	450	7.6
R51N-36	51.0	36.0	800	630	7.6
R51N-33	51.0	33.0	800	630	8.4
T76N-49	76.0	49.0	1600	1200	16.5
T76S-45	76.0	45.0	1900	1500	19
T30-11	30.0	11.0	320	260	3.3
T30-14	30.0	14.0	275	220	2.9
T40-16	40.0	16.0	660	525	7.1
T40-20	40.0	20.0	540	425	5.6
T52-26	52.0	26.0	930	730	10
T73-56	73.0	56.0	1035	830	10.8
T73-53	73.0	53.0	1160	970	14
T73-45	73.0	45.0	1600	1270	17.5
T73-35	73.0	35.0	1865	1430	21.2
T103-51	103.0	51.0	3660	2670	44
Steel grade		Acc. to EN10083-1 / EN10210-1
Thread direction		Left hand / Right hand

Service

The technical support team may provide remote or on-site support to resolve issues encountered by users during use.
Provide original spare parts to ensure timely replacement of worn or damaged parts to maintain the normal operation of DTH bits.
Timely information reply throughout the day, the first time to solve your problems.