ZL-5B steel bar prestress tester steel cold bending punch wholesale price

Rebar prestress tester Steel cold bend punch wholesale price
B Rebar prestress tester, steel wire prestress dynamometer, prestressed steel bar, steel wire tensioner dynamometer are mainly used in the production of concrete prestressed components In this process, the prestress of the steel wire after tensioning and anchoring is detected and the tensile machine dynamometer is calibrated. This machine adopts advanced microcomputer control and digital display technology, and can test a variety of different specifications of steel wire prestress, and the price is lower than similar products.
Main technical parameters of prestressed steel bars with steel bar prestress measuring instrument:
, force measuring range.
, test wire diameter
, appearance, force measuring range
, accuracy Error: no more than .%
, Appearance: ,
, Self-weight:
The steel bar prestressing tester tensions the prestressed bars before pouring concrete, and temporarily Anchor on the pedestal or steel form, and then pour concrete. When the curing of the concrete reaches no less than % of the concrete design strength value and ensures sufficient bonding between the prestressed tendons and concrete, relax the prestressed tendons and use the concrete and prestressed The bonding of tendons and the construction process of applying prestress to concrete. The pre-tensioning method is generally only suitable for the production of small and medium-sized components, which are produced in fixed prefabricated plants
The long-line pedestal method can be used to produce components with the steel bar prestressing tester. Generally, the length of the pedestal is between ~, or the unit is flown in the steel mold Legally produced components. The production of components by the pre-tensioning method involves pedestals, tensioning machines and fixtures, and the pre-tensioning method
The steel bar prestressed measuring instrument pedestal is the main load-bearing component in the production of pre-tensioning components, and it must have Sufficient load-bearing capacity, stiffness and stability to avoid loss of prestress due to deformation, overturning and slipping of the pedestal to ensure the quality of components produced by the pre-tensioning method. There are many forms of pedestals, which are adapted to local conditions, but they can generally be divided into two types: pier pedestals and trough pedestals. Steel bar prestress tester. Pier type pedestal The pier type pedestal consists of three parts: the load-bearing pier, the table and the beam. Its length should be ~. The bearing capacity of the pedestal should be based on the tensile force of the components. The pedestal can be designed based on the bearing capacity per meter of width of the pedestal.
Steel prestress measuring instrument
() Load-bearing piers Load-bearing piers are generally buried underground and made of cast-in-situ reinforced concrete. The pedestal should have sufficient bearing capacity, stiffness and stability. The stability check of the pier includes anti-overturning calculation and anti-slip calculation.
Check the pit overturning of the platform pier. The calculation diagram is shown in the figure. Calculate according to the following formula:
The anti-overturning complete coefficient in the formula should not be less than.
Overturning moment () , generated by the tensile force of the prestressed tendons
The tensile force of the prestressed tendons ()
The moment arm () from the tensile force of the prestressed tendons from the application point to the overturning point
Anti-overturning moment () ), generated by the self-weight of the pier and active earth pressure, etc.
The self-weight of the pier ()
The moment arm from the center of gravity of the pier to the overturning point
The resultant force of the active earth pressure on the left side of the pier () ), which can be ignored when the buried depth of the pier is very shallow
The moment arm () from the center of gravity of the resultant active earth pressure to the overturning point.
The position of the overturning point of the steel wire prestressed dynamometer pier
. For the pedestal where the pier and the tabletop work together, according to the actual situation, the overturning point should be on the surface of the concrete tabletop, but considering the platform The tendency of the pier to overturn may cause stress concentration at the end apex of the table and affect the construction quality of the concrete surface layer. Therefore, the overturning point should be located downward from the concrete table.
Figure. Simple calculation diagram for the overturning resistance of the load-bearing pier. Simple calculation diagram for the anti-slip calculation of the load-bearing pier
The calculation diagram for the anti-slip calculation of the load-bearing pier is as shown in the figure. Press Calculate the formula.
The anti-slip safety factor in the formula should be no less than The friction resistance consists of, which is the main anti-slip force. The following data are provided for reference:
When the countertop is made of concrete, the thickness, the resistance capacity per meter of width of the countertop is taken to be ~
When the countertop is made of concrete , thick, the resistance capacity per meter of table width is taken ~
When the table is made of concrete, thick, the resistance of each meter of table width is taken ~
When concrete table is used and works together with the pier, Generally, it is not necessary to perform anti-slip calculations, but the load-bearing capacity of the table should be calculated.
() Countertops
Countertops are generally made by pouring a layer of concrete with a thickness of ~ on a compacted gravel cushion. Its horizontal bearing capacity can be calculated according to the following formula:
In the formula, the longitudinal bending coefficient under axial compression is taken as
The cross-sectional area of the table ()
The calculated value of the concrete axial compressive strength ()
The overload coefficient of the table bearing capacity is taken as .
The additional complete coefficient considering the unevenness of the table and other influencing factors is taken as .