Mono Strand Jack
YDC250QX post tension mono strand jack is a kind of prestressed through the core of the front card jack, used for single tensile construction with bond and no bond, widely used in prestressed concrete structures, Bridges, rock and soil anchorage and other works, especially suitable for working in the air, easy to carry.
Mono strand jack series
The 10 ton mono strand jack is used for pretensioning and tensioning of Φ15.24 single prestressing tendons.
The 25 ton mono strand jack is used for tensioning the Φ15.24 or Φ12.7 single prestressed tendon.
The 30 ton mono strand jack is used for tensioning the Φ15.24 or Φ12.7 single prestressed tendon.
Mono Strand Jack Features
1. The YDC250Q mono strand jack adopts the front snap-in type (that is, the tool is staggered to the front). Steel strands can be tensioned with a reserved length of 200mm, which can save prestressed tendon materials.
2. During the stretching process, the mono strand jack can automatically clamp the prestressed tendons and retreat, thereby reducing labor intensity and improving efficiency.
3. The mono strand jack is designed with accessories with various functions, which can be selected and used according to the needs during work.
4. The mono strand jack will not rotate when working, which avoids the excessive elongation of the steel strand due to rotation.
Application
The mono strand jack is used for bridge engineering and post-tensioning prestressed tensioning construction of roof steel structure rods.
The mono strand jack is especially suitable for high-altitude operations and is used for tension single-strand steel strands in bridge engineering.
The mono strand jack is used for single tension construction with bonded tendons in prestressed concrete engineering.
Technical Parameters
Type | Nominal tension force KN | Nominal oil pressure MPg | Tension piston area m2 | Return piston area m2 | Stroke for tension mm | Overall size mm | Coss-core aperture Φ mm | Mass KG | Supporing oil pump |
YDC250QX-200 | 250 | 52 | 4.77×10-3 | 1.335×10-3 | 150 | Φ114×424 | 19 | 20 | ZB4-500 |
| YDC250QX-200 | 250 | 52 | 4.77×10-3 | 1.335×10-3 | 200 | Φ114×474 | 19 | 21.5 | ZB4-500 |
Structure Diagram
The mono strand jack adopts the dynamic cylinder structure, which has the performance of continuous follow-up and repeated tension.
Product Details
Main Accessories:
One set mono strand jack will complete with 2pcs construction jack oil pipe;stressing device,retracting device,1 set jack wedge,and hydraulic jack machine seal rings.
Supporting Products
Round Anchor System
Used for single tensile construction of M15, M13 with bond bar
Electric Oil Pump
Used for prestressed concrete structure with pretension method and post tension method
Intelligent Tension System
Used for prestressed concrete structure with pretension method and post tension method
Preparations before using the mono strand jack
(1) Select proper clamp jaws(6),washers(2) and other accessories according to strand size. Detailed selection:
(a)Restraining tension mono-strand working anchor
① As show in the structure diagram, to post-tension Φ15.2 and Φ15.7 strand, choose nut of supporting sleeve(1), LQ 15 clamp jaw(6) and supporting sleeve(3), as well as put washer (2)between supporting sleeve and the nut.
② To post-tension Φ12.7 and Φ12.9 strand, choose nut of supporting sleeve(1), LQ 13 tool clamp jaw(6) and supporting sleeve(3), as well as remove the washer (2)between supporting sleeve and the nut.
Same accessory | Specific accessory |
Nut of supporting sleeve supporting sleeve | LQ 15 tool clamp jaw washer |
| LQ 13 tool clamp jaw |
(b)Restraining tension mono-strand tool anchor
① As shows in the structure diagram, to tension Φ15.2 and Φ15.7 strand,choose LQ 15 tool clamp jaw(6) and put washer(2) between supporting sleeve(3) and nut of supporting sleeve (1).
② To tension Φ12.7 and Φ12.9 strand as the operation above except for the selection of LQ 13 tool clamp jaw and the remove of washer(2).
Same accessory | Specific accessory |
Nut of supporting sleeve supporting sleeve | LQ 15 tool clamp jaw washer |
| LQ 13 tool clamp jaw washer |
(c)Restraining tension group anchor
① When the Φ15.2 or Φ15.7 specification steel strand is post-tensioned, except that the support sleeve nut (1) in the structure diagram is replaced by the group anchor stop nut, the rest is installed according to the structure diagram and is the same as the above (a);
② When post-tensioning Φ12.7 or Φ12.9 steel strands, in addition to installing according to the structural diagram and the same as the above (a), it is also necessary to use the corresponding working limit plate to tension.
Same accessory | Specific accessory |
Supporting sleeve restraining nut of group anchor | LQ 15 tool clamp jaw washer |
Working restraining plate LQ 13 tool clamp jaw |
(2) Check the operation of hydraulic oil pump and the hydraulic oil circuit in jack.
(3) Check the function of tightening strand by jack clamp jaws, follow the working principle picture to examine the retraction and exhaust of jack.
(4) Avoid the rough end of exposed prestressed tendon which shouldn't be shorter than 200mm, and keep the tendon from dirt and rust to prevent the bad influence on putting it through and tensioning anchor.
2.Installation of Jack
(1) Prevent leakage from the connection after installing hydraulic oil circuit in jack.
(2) Lift the jack,put prestressed tendon though it and press its front part on the anchor plate.
What should I pay attention to when using the mono strand jack?
1. To reach the accurate tension, test the mono strand jack for oil-pressure value and output force before using.
2. Keep the oil clean, which mustn't be polluted by impurity.
3. Before operating the mono strand jack,please examine tool anchor for the existence of rust, damage and deformation, as well as its automatic work in the retraction. Frequently wipe the tool anchor with special lubricant(itemized in the packing list), do not use white wax,grease or other substitutes.Clean wave form in tool clamp jaws, external wedge and anchor cup, as well as wipe the surface of tool clamp jaws or inner surface of anchor cup.
4. Check the leakage of jack through trial.
5. Keep the mono strand jack from dust,sunshine and collision during using,transporting and safe keeping.
6. Expel the air in cylinder before operating.The detailed way of expelling is to keep the operating for 2 or 3 times. When piston resets, the piston must return to primitive position. The value in pressure meter shouldn't overtake 20PMa.
7. Over-stroke of the piston is banned.
Company Profile
Our company is a professional enterprise integrating the production of prestressed anchor, machine tools and supporting products, installation and construction of prestressed engineering and research and development of prestressed engineering.
Team
Our company team consists of more than 100 members with a wide range of majors, including accounting, international trade, human resources, civil engineering, and industrial engineering. We are an excellent team with combat effectiveness and can stand up to ten.
Factory show
All our mono strand jacks are produced by precision CNC machine tools. In addition, with the continuous development of Lingqiao, the company has added new CNC machine tools and CNC drilling machines in recent years.
Certifications
Product Quality Control
The mono strand jack adopts the pressure drop method to carry out the full-load performance test and measures the oil pressure drop value of the working cylinder of the jack.
Production process
Production Equipment
Every part of the mono strand jack is manufactured by precision machine tools in our factory. We have professional production personnel in charge, and the quality is reliable and guaranteed. In addition, we also provide online technical guidance and have a complete after-sales service system.
Packaging & Shipping
The mono strand jack is packed in a wooden box to ensure its safety during transportation.
With the guidance of experienced building experts in prestressing force, we have more experience. Our Lingqiao prestressing anchorage system was developed by many famous research institutes including China Academy of Building Research.