Self-locking Anchorage Product

Pubdate：2018-12-29Author：巨成研究院View：2307

Product Profile

Self-locking anchorage technology has been the original works by Prof. Zhou Jianbo. JUCHENG STRUCTURE has applied for its patent since 1999 and worked with Wuhan University to develop a package of technologies and products. The research team composed of Prof. Zhou Jianbo, Prof. Gao Zuoping and Prof. Chen Mingxiang has taken 20-year sustained efforts on R&D. Currently, the patents applied for self-locking anchorage technologies and products by JUCHENG STRUCTURE add up to 100 plus.

The core of JCZ Jucheng Zhou’s self-locking anchorage technology lies in counterbore self-locking anchor rod. Its construction technology and anchorage principle have been shown below: The bottom of drilled straight hole on the substrate (rock or concrete) will be expanded into conical surface and inverted one with tailored counterbore bit, then insert the end of anchor rod installed with intact anchor head to the bottom of hole. The axial pressing forces the anchor head to open itself and stays close to conical surface at the bottom of hole. The mechanical bite force between anchor head and hole wall (that is, "self-locking") and the frictional resistance after injecting adhesive (grout) to anchorage sections will be applied to provide anchorage force.

The anchoring body will be connected to the substrate as a whole by using counterbore self-locking anchor rods, which will give full play to great anchoring force, length reduction at the anchoring section, and reliable anchorage. Compared to chemically planted bars, self-locking anchoring rod boasts its excellent durability, high temperature resistance, and corrosion resistance. Over the past two decades, millions of counterbore self-locking anchoring rods have been applied to architectural rehabilitation and reinforcement, anti-floating for underground construction, abutment anchoring, rail anchoring, hydraulic structure and wind power project in an effort to enhance structure safety, reduce construction period, provide disaster relief and emergency rescue and save the investment for sound social and economic benefits, which are expected to replace chemically planted bars both home and abroad and contribute to revolutionary advances in the architecture rehabilitation!

Performance Indicator

Performance Index of JCZ-ZS-MG Jucheng Zhou’s Self-locking Anchor Rod

Type	Outside Diameter of Anchor Rod d（mm）	Standard Embedded Depth H(mm)	Length of Anchor Rod L(mm)	Anchorage Depth of Chemically Planted Bar H’（mm）	Design Value of Tensile Strength N_sk（kN）	Design Value of Shear Strength N_vk（kN）
JCZ-ZS-MG-12	12	180	216	261	39.32	19.66
JCZ-ZS-MG-14	14	210	252	305	53.52	26.76
JCZ-ZS-MG-16	16	240	288	349	69.90	34.95
JCZ-ZS-MG-18	18	270	324	392	88.47	44.23
JCZ-ZS-MG-20	20	300	360	436	109.22	54.61
JCZ-ZS-MG-22	22	330	396	480	132.15	66.08
JCZ-ZS-MG-25	25	375	450	545	170.65	85.33
JCZ-ZS-MG-28	28	420	504	610	214.07	107.03
JCZ-ZS-MG-32	32	480	576	697	279.60	139.80
JCZ-ZS-MG-36	36	540	648	713	353.86	176.93

Note: 1. This table is applicable to the C30 concrete substrate, and concrete of any other strength can be calculated according to the relevant formula in “Technical Specification for Rock and Concrete Self-locking Anchorage (DB42/ T-2018)”.

2. The anchor rod material in this table shall meet the performance index of 5.8 grade steel.

3. For anchor rods that are required to meet the design length of relevant standards, regulations and specifications, they shall be customized in advance.

rformance Index of Supporting Counterbore Bit for JCZ-ZS-ZT Jucheng Zhou’s Self-locking Anchor Rod

Type	Outside Diameter of Anchor Rod d（mm）	Diameter of Straight Hole D1(mm)	Diameter of Counterbore D2(mm)
JCZ-ZS-ZT-12	12	18	22
JCZ-ZS-ZT-14	14	20	26
JCZ-ZS-ZT-16	16	22	30
JCZ-ZS-ZT-18	18	25	34
JCZ-ZS-ZT-20	20	25	38
JCZ-ZS-ZT-22	22	28	42
JCZ-ZS-ZT-25	25	30	48
JCZ-ZS-ZT-28	28	35	54
JCZ-ZS-ZT-32	32	38	62
JCZ-ZS-ZT-36	36	40	70

Note: In actual construction, the diameter of counterbore shall not be less than the value of D2 in the above table.

Construction Technology

Drilling→ Counterbore → Cleaning → Measuring → Grouting → Pressing and Locking

Drilling for Straight Hole Counterbore for Conical Hole Section after Installing Self-locking Anchor Rod

Product Display

1. Packaging

2. Self-locking Anchor Rod

3. Counterbore Bit

4. Counterbore Drilling Rod

5. Hole Measuring Instrument

6. Grouting Material

Honors and Awards

（1） The project of “Research and Practice on Key Technologies of Heightening and Strengthening for High Concrete Gravity Dam” has been awarded with Grand Prize of China Hydropower Science and Technology.

（2） Series of Self-locking Anchor Rods for Moderately and Heavily Weathered Rock

Industrialization Demonstration Project Certificate of“National Torch Plan”by Ministry of Science and Technology

（3） Series of Mechanical Self-locking Anchor Rods

China High-tech Products “Excellent Product Certificate”

Project Case

Corridor Rehabilitation and Reinforcement for Pumped Storage Power Station in Tianhuangping (Self-locking Anchor Rod)

Emergency Treatment Project for Track Baseplate Floating at No. 2 Tunnel of Xingjiangshan along the Wuhan-Guangzhou High-speed Railway (Instantaneous Self-locking + Prestress)

Heightening and Strengthening Project Application for Danjiangkou Dam (200t Prestressed Anchor Rod)

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Self-locking Anchorage Product