CN-121988880-A - Clamping piece type anchorage with anti-seizing property and manufacturing method

Abstract

The invention discloses a manufacturing method of a clamping piece type anchorage with seizure resistance, belonging to the technical field of building construction and large-scale mechanical equipment installation. The method comprises the following steps of S1, providing a clamping piece type anchorage device, wherein clamping pieces of the clamping piece type anchorage device are of internal tooth structures, S2, cladding a copper alloy material on the outer walls of the clamping pieces of the clamping piece type anchorage device through a fusion welding process to enable the copper alloy material to be in metallurgical bonding with the outer walls of the clamping pieces, and S3, cooling and controlling the temperature of the clamping piece type anchorage device after cladding to enable the temperature of the internal teeth of the clamping pieces to be lower than the lowest temperature of a previous heat treatment process so as to form a metallurgical bonding layer with self-lubricating characteristics. The copper alloy material consists of the following components in percentage by mass of 11.0-13.0% of tin, 1.5-2.5% of nickel and the balance of copper and unavoidable impurities. According to the invention, through precisely controlling the heat input and cooling parameters of the welding, the seizure resistance and self-lubricating property of the outer wall of the clamping piece are obviously improved on the premise of not reducing the hardness of the inner teeth of the clamping piece.

Inventors

• CHEN LI
• BIAN YONGMING
• JIANG WENYUAN

Assignees

• 同济大学

Dates

Publication Date

20260508

Application Date

20260410

Claims (8)

1. 1. A method of manufacturing a clip type anchor having seizure resistance, the clip of the clip type anchor having an internal tooth structure, comprising the steps of: s1, providing a clamping piece type anchorage device; s2, cladding a copper alloy material on the outer wall of a clamping piece of the clamping piece type anchorage device through a fusion welding process, so that the copper alloy material and the outer wall of the clamping piece are metallurgically bonded; And S3, cooling and controlling the temperature of the clad clamping piece type anchorage device, so that the temperature of the internal teeth of the clamping piece is lower than the lowest temperature of the previous heat treatment process, and a metallurgical bonding layer with self-lubricating property is formed.
2. 2. The method according to claim 1, wherein the copper alloy material comprises, by mass, 11.0 to 13.0% of tin, 1.5 to 2.5% of nickel, and the balance copper and unavoidable impurities.
3. 3. The method according to claim 1, wherein in step S2, the welding process is laser welding, the laser power is 600W-1000W, and the scanning speed is 800-1200mm/min.
4. 4. The method according to claim 1, wherein in step S3, the cooling temperature is controlled by water cooling, the flow rate of the cooling medium is 20-40ml/min, the initial temperature is 10-25 ℃, and the internal teeth of the clip are at a temperature lower than 400-500 ℃.
5. 5. The method of manufacturing according to claim 1, wherein after the cladding treatment, the metallurgical bonding layer has a thickness of 0.1mm to 0.5mm, a hardness of 120 to 200HB, and a bonding strength of >200MPa between the metallurgical bonding layer and the clip outer wall.
6. 6. The method according to claim 1, wherein in step S2, a plurality of clip type anchors are fixed to the cladding turntable in groups, and cladding treatment is performed at a rotation speed of 10 to 20 rpm.
7. 7. The method of manufacturing according to claim 1, further comprising the step of: s4, performing thickness measurement, hardness measurement and bonding strength test on the metallurgic bonding layer after cladding; wherein the thickness of the metallurgical bonding layer is more than or equal to 0.1mm, the hardness is more than or equal to 120HB, and the bonding strength is more than 200MPa.
8. 8. A clip-type anchorage having seizure resistance, characterized by being produced by the manufacturing method of any one of claims 1-7.

Description

Clamping piece type anchorage with anti-seizing property and manufacturing method Technical Field The invention relates to the technical field of building construction and large-scale mechanical equipment installation, in particular to a manufacturing method of a clamping piece type anchorage device for prestress anchoring, and particularly relates to a manufacturing method of a clamping piece type anchorage device with seizure resistance. Background The clip type anchorage is widely applied to the engineering fields of integral installation of large structures, such as highway bridges, railway bridges, urban overpasses, urban light rails, high-rise buildings, water conservancy and hydropower dams, ports and wharfs and the like. The prestress anchorage clamping piece mainly comprises an anchorage ring and a clamping piece. The anchor ring is usually made of carbon steel or 40Cr steel, and the clamping piece is made of high-strength alloy steel and has certain elasticity. The working principle of the clamping piece type anchorage device is that the clamping piece generates a large clamping force on the steel strand under the action of tension force by utilizing the conicity of the anchor ring and the clamping piece, and the steel strand is anchored by the friction resistance between the clamping piece and the steel strand. The specific process of the clamp type anchor in the lifter comprises the following steps that when the jack is used for stretching the steel strand, the jack slowly stretches after the designed stress value is reached, and the clamping piece of the prestress anchor is brought into the conical hole of the anchor plate by the steel strand which moves in a uniform-speed retraction mode. At this time, the outer conical surface of the clamping piece is matched with the inner conical surface of the anchor plate, the steel strand is anchored by utilizing the wedge-shaped principle, and the stress of the steel strand bundle is transmitted to the building structure through the anchor plate and the anchor backing plate, so that permanent prestress is formed. The contact pressure of the clamping piece and the steel strand can reach 1800MPa, and the friction coefficient is stabilized at 0.22+/-0.03, so that the anchoring reliability is ensured. The clamping piece type anchorage has the advantages of stable anchorage performance, uniform stress, safety, reliability and the like. However, the problem that the clamping piece and the anchor ring are easy to be blocked in the whole installation process of the large-scale structure exists at present. The clamping piece and the anchor ring are close in material hardness, or the clamping piece is worn out and the surface state is changed after being used for many times, so that the friction force between the clamping piece and the anchor ring is overlarge, normal movement and anchoring of the clamping piece are affected, and the risk of seizure is increased. In view of the above problems, there are some improvements in the prior art. For example, patent application CN117780020a devised an anchor with a soft metal layer, but its deformation characteristics made it difficult to recycle. The clip-on anchorage designed in patent application CN117127757a only considers the fastening process and is not specifically optimized for environments requiring repeated stress application. In addition, in the prior art, a method for preparing the self-lubricating layer by adopting the lead-containing copper alloy through a laser cladding process is also adopted, but lead is easy to segregate at high temperature, so that the lead is unevenly distributed, the material performance is influenced, and the lead-containing material has environmental protection risks. Therefore, on the premise of ensuring the original anchoring performance of the clip type anchorage, the anti-seizure performance between the outer wall of the clip and the inner wall of the anchor ring is effectively improved, and meanwhile, the adverse effect of a cladding process on the hardness of the inner teeth of the clip is avoided, so that the technical problem to be solved in the field is urgent. Disclosure of Invention Aiming at the defects that the clamping piece and an anchor ring are easy to be bitten in the use process of the traditional clamping piece type anchorage device and the prior improvement scheme is difficult to be compatible with the seizure resistance performance and the hardness of the inner teeth of the clamping piece, the invention provides a manufacturing method of the clamping piece type anchorage device with seizure resistance, which can obviously improve the seizure resistance performance and the self-lubricating characteristic of the clamping piece type anchorage device without reducing the original anchoring performance, and simultaneously protect the hardness of the inner teeth of the clamping piece from being reduced due to the influence of cladding heat, thereby greatly improving