Do You Know What the Self-drilling Ahchor Bolt System Is? Let's figour it out together

Time:2022-01-12From:sinorock View:

The self-drilling anchor bolt system is a new technology developed in recent years, suitable for broken rock, loose soil and geological conditions where are difficult to drill holes. It helps to ensure anchoring effect in complex ground foundation and achieving best construction result.

The self-drilling anchor bolt system achieves the result of combining drilling, grouting, and anchoring into one step. When drilling in the loose rock or collapsing soil. It has three advantages compared to traditional methods: convenient to operating, high work efficiency, and good anchoring effect. can fill cracks, consolidate rock mass and soil layer through pressure grouting, and has good grouting spreading radius and reliable anchoring quality. That’s why I need to show you this product.

Thread

Two threads of self-drilling anchor bolt system are available. One is R thread, and another is T thread.

Components

The self-drilling anchor bolt system consist of 6 parts, a hollow bar, a drill bit, a coupler, a bearing plate, a nut, and a centralizer.
the structure of self-drilling anchor bolt system

the structure of self-drilling anchor bolt system

A hollow bar, including variety of diameters, can be used as not only a drill pipe, but also a grout pipe and an anchor bolt;
hollow bars

Size	Outer Dia. (mm)	Ultimate Load (kN)	Yield Load (kN)	Weight (Kg/m)
SER25N	25	200	150	2.35
SSR32L	32	210	160	2.83
SSR32N	32	280	230	3.50
SSR32S	32	360	280	4.00
SER32L	32	210	160	2.60
SER32N	32	280	230	2.95
SER32S	32	360	280	3.50
SER32S1	32	405	320	4.00
SCR32L1	32	250	190	2.60
SCR32N	32	280	230	2.83
SSR38N	38	500	400	5.50
SER38N	38	500	400	4.95
SER38S	38	550	450	5.90
SSR51L	51	580	450	6.75
SSR51N	51	800	630	9.00
SER51L	51	550	450	6.20
SER51L1	51	660	540	6.75
SER51N	51	800	630	8.20
SCR51S	51	925	740	9.25
SST30L	30	220	180	2.90
SST30N	30	260	220	3.35
SST30S	30	320	260	3.60
SST40N	40	539	430	6.20
SST40S	40	660	525	7.20
SET40N	40	539	430	5.70
SET40S	40	660	525	6.80
SST52N	52	929	730	10.20
SET52N	52	929	730	9.70
SET73L	73	1160	970	13.20
SET73N	73	1585	1270	17.80
SET73S	40	1865	1430	21.20
SET76N	76	1600	1200	16.50
SET76S	76	1900	1500	19.70
SET103N	103	2270	1800	23.50
SET103S	103	3660	2670	44.60
SET111L	111	2640	2000	25.00
SET111N	111	3650	2750	34.50
SET127L	127	2400	1810	30.50
SET130S	130	7940	5250	78.00
SET130N	130	6340	4200	78.00
SET150S	150	8400	5600	108.00
SET200S	200	14230	9500	183.00

A drill bit, which can be selected according to different geological condition, is made of steel or alloy;
drilling bits

A coupler, used to lengthen the hollow bar by connecting several ones together;

coupler

A bearing plate and a nut, which is forged with a center hole, is installed on the free segment of the hollow bar to transfer the pressure from the rock mass;

plates nuts

A centralizer, is used to ensure the hollow bar at the center of the drill hole when drilling.

Features and Advantages

Convenient to operate

Self drilling anchor bolt system combines drilling, grouting and anchoring together. Therefore, it is very convenient to operate for the broken rock and conditions which are difficult to drill holes. Casing pipe is omitted in construction, which greatly improves the construction efficiency.

Rich variety of drill bits

Self drilling anchor bolt system has a rich variety of drill bits, and the drill bits can be selected according to the properties of rock and soil, which can improve the drilling efficiency.

Reliable anchoring quality

Self drilling anchor bolt system can fill cracks, consolidate rock mass and soil layer through pressure grouting, and has good grouting spreading radius and reliable anchoring quality.

Work well in narrow space

The hollow anchor bar can be cut arbitrarily and lengthened by the coupler. Therefore, self drilling anchor bolt is suitable for the construction in the narrow space which the large equipment can not enter.

Construction process

Application

applications of self drilling anchor bolt system

The self-drilling anchor bolt system is mainly used for tunnel and underground engineering, slope engineering, ground and foundation engineering. It can be used for pre-construction support and can effectively enhance the stability of soil and rock mass.

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