China Construction Eighth Engineering Division Tianjin Construction has obtained a patent for a reusable wedge-locking expansion bolt.

June 13, 2025 - Information from the National Intellectual Property Administration shows that China Construction Eighth Engineering Division Tianjin Construction Engineering Co., Ltd. has obtained a patent titled "Reusable Wedge-Locking Expansion Bolt", with the authorization announcement number CN222977180U and an application date of July 2024.

The patent abstract states that this utility model discloses a reusable wedge-locking expansion bolt, comprising: a screw rod; a reaction end cap with opposite first and second end faces, where the first end face is inclined, and the first end of the screw rod is connected to the first end face; a movable sleeve sleeved on the screw rod, with an inner diameter larger than the outer diameter of the screw rod and an outer diameter matching that of the reaction end cap. The movable sleeve has opposite third and fourth end faces, with the third end face inclined and abutting against the first end face; a pressing nut screwed onto the screw rod to press against the fourth end face, causing the reaction end cap and the movable sleeve to be错位设置 (dislocated); and a check nut screwed onto the second end of the screw rod, abutting against the end of the pressing nut away from the movable sleeve to prevent the pressing nut from retreating.

According to Tianyancha data, China Construction Eighth Engineering Division Tianjin Construction Engineering Co., Ltd. was established in 2006 and is located in Tianjin, specializing in housing construction. The company has a registered capital of 200 million RMB. Big data analysis by Tianyancha shows that the company has participated in 151 bidding projects, holds 584 patent records, and has 175 administrative permits.