Prestressing Anchorage Kits

Prestressed anchorage product description, process flow, application area

1.1 Anchorage
In a post-tensioned prestressed concrete structure or a prestressed steel structure, a permanent anchoring device used to maintain and transmit the tensile force of the prestressed tendons to the structure.

1.2 Grip Grip
In the production of pre-tensioned prestressed concrete members, a temporary anchoring device used to maintain the tension of the prestressed tendons and fix them on the production pedestal (or equipment); A temporary anchoring device that clamps the prestressed tendon on the tensioning jack or equipment when pulling the prestressed tendon.

1.3 Connector Coupler
Device for connecting prestressed tendons.

2.1 Prestressing tendon
In prestressed structures, single or bundled steel wires, strands or finished rebars, etc., are used to establish prestressing. Prestressed tendons can be divided into bonded prestressed tendons, unbonded prestressed tendons and slow-bonded prestressed tendons according to their bonding characteristics; they can be divided into coated prestressed tendons and uncoated prestressed tendons according to whether there is a coating on the surface. Prestressed tendons.

2.2 Prestressing tendon-anchorage (grip) assembly
The force-bearing unit assembled by the prestressed tendons and the anchors (fixtures) installed at the ends.

2.3 Prestressing tendon-coupler assembly
The force-bearing unit assembled by the prestressed tendon and the connector.

2.4 Prestressed tendons - anchors (fixtures, connectors)
Ultimate tensile force of tendon-anchorage (grip, coupler) assembly

2.5 Prestressed tendons - anchors (clamps, connectors)
The maximum tensile force achieved by the assembly during the static load test.

2.6 Efficiency factor of prestressing tendon
Affected by factors such as the number of prestressed tendons, test equipment and initial stress adjustment, the coefficient of uneven tensile stress of prestressed tendons is considered.

3.1 Retracting Draw-in
During the anchoring process of the prestressed tendon, the phenomenon of shrinkage of the prestressed tendon caused by the relative displacement between the parts of the anchor and between the anchor and the prestressed tendon.

3.2 Bearing Plate
In the post-tensioned prestressed concrete structure, the components used to withstand the prestressed force from the anchor and transmit it to the concrete include ordinary anchor pads and cast anchor pads.

3.2.1 Basic Bearing Plate
In the post-tensioned prestressed concrete structure, the prestressed force from the anchor is directly transferred to the steel plate of the concrete.

3.2.2 Casting Bearing Plate
The backing plate that casts the end plate and the horn tube into one, usually adds a secondary flange or a tertiary flange to the horn section, and the force transmission depends on the end plate, the horn section and the flange.

3.3 Anchorage Zone
In the post-tensioned prestressed concrete structural member, the part of the member section that bears the prestressed force from the anchor and makes the stress of the concrete section tend to be uniform. The anchoring area can be divided into local anchoring area and overall anchoring area. The local anchoring zone refers to the concrete rectangular-section prism directly surrounding the prestressed anchoring device and its reinforcing steel bars; the global anchoring zone refers to the part of the anchoring zone where the stress outside the post-tensioned prestressed local anchoring zone has not been fully homogenized.

4.1 Anchor Joint
In prestressed steel structures, the structural stress components used to bear the prestressing force of prestressed tendons (stays).

4.2 Load Transfer Test
Tests carried out to verify the force transfer performance of the local anchorage zone.

4.3 Prestress Loss due to Friction at Anchorage Device
The prestressed tendon is lost due to friction at the corners of the anchorage and the bell mouth of the tensioning end backing plate.

Production process

The anchor plate material is made of 40Cr alloy structural steel, in terms of processing technology:
A. The use of CNC machine tools not only improves the dimensional accuracy of the product, but also increases the processing speed and shortens the processing time.
B. The anchor plate adopts a unique cold extrusion process, that is, after heat treatment and finely reaming each taper hole, the taper hole is extruded under the ultra-limit pressure through a special tool to meet the design requirements of the drawing. The advantages are: effectively improve the inner cone surface structure of the anchor plate and strengthen the inner cone surface strength of the anchor plate.
C. CNC drilling and milling center processing not only improves the dimensional accuracy of the product, but also increases the processing speed and shortens the processing time.
D. After the machining is completed, the flaw detection process is carried out, and the dehydrogenation is carried out after galvanizing to ensure the inherent quality of the anchor plate. The position of the hole is guaranteed by the drilling die and strictly inspected to ensure that the unqualified products do not flow into the next process, and to ensure that the warehousing products are 100% qualified.

Fields of application
Products are widely used in highway bridges, railway bridges, urban interchanges, rail transit, high-rise buildings, water conservancy and hydropower dams, port terminals, LNG low-temperature natural gas storage tanks, wind power towers, photovoltaic power generation brackets, rock slope protection anchoring, foundation reinforcement , tunnel support, prestressed grid, urban subway, large-scale comprehensive venues, warehouse workshops, tower buildings, heavy lifting, sliding film intermittent propulsion, bridge and tunnel jacking, large containers and ships, sleepers, replacement of bridge bearings, Bridge and building reinforcement, reinforcement engineering, anti-magnetic and anti-corrosion engineering (fiber anchors), carbon fiber reinforcement, pre-tensioned beam field construction, external prestressed engineering, stay cables, suspension cables, suspension rods and other prestressed structures should be Engineering environmental conditions, structural characteristics, types of prestressed tendons and tensioning construction methods, select suitable anchors, fixtures and connectors. For non-standard products, our company can customize production according to customer standards.