Quotation
PRODUCT CATEGORIES
Hydroseeding Equipment
Grout Plant
Grout Mixer and Agitator
Grout Pump
Refractory Gunite/Shotcrete/Mixer
Planetary Concrete Mixer
Shotcrete Machine
Peristaltic Pump
Anchor Equipment and Tools
Foam Concrete Machine
Filter Press
Slurry Pump
Drilling Rig
Plaster Pump
Road Marking Machine
Concrete Pump
Hydraulic Pump Station
DTH Drill Tools
Customized Service
Send Inquiry

Analyse causes of the Prestressed anchorage loss

2014-10-10 15:19:17

We often want to reinforce some operational processes, precisely because of the high construction safety performance requirements for reinforcement, so Anchorage has been used. In prestressed tension device, the most important thing is post-tensioned. Post-tensioned, what does? Loss how generated?
Pre-tensioned
In accordance with the provisions of the first pedestal design requirements will be reinforced sheets pulled control stress → and temporary fixed anchorage → → pouring concrete to meet the design strength of concrete to be more than 75% cut relax rely on bond strength of reinforced steel and concrete to pass the pre-stress. Construction is simple, relying on bond strength of self-anchored, no need to spend a special anchorage, temporary anchorage can be reused (generally referred instrumental anchorage or fixtures), when mass production economy, quality and stability. Small components used in industrial production.
Post-tensioned
Buried control holes for pouring concrete → → → conservation wear bars pumping pipe tensioning → ​​Anchorage → filling (to prevent rusting steel). Anchorage stop relying on elastic rebound of steel, so get pre-stress concrete cross-section. This method is simple equipment, no tension pedestal, production flexibility, but requires reliable anchorage and jack, anchor steel capacity, on-site construction applicable to large components.

Measures:

① Select the deformation is small or narrow anchor prestressing steel to minimize the number plate; ② for pre-tensioned members, choose a long pedestal.

2 friction loss s12: Reason: In the process of tensioning the tendons, the friction-tensioned tendons and pore wall between between pre-tensioned tendons and anchorages break point and friction, but also tensile stress will cause losses.

Measures: ① for longer member can be tensioned at both ends; ② ultra-tensioned.

3 the temperature difference between the loss of s13: Reason: loss measures the temperature difference between the pre-tensioned caused by heat conservation: ① using secondary heating maintenance. ② on prestressed steel reinforcement.

4 Stress relaxation losses σl4 reasons: length constant tendons in the long-term effects of high stress will produce relaxation, can cause loss of prestress.

Measures: ultra small tension or relaxation prestressed reinforcement.

5 concrete shrinkage and creep damage caused and σl5 reasons: to produce concrete harden the volume contraction in the pre-pressure effect, concrete creep will occur, which will cause the member to shorten, member of the prestressing steel followed by retraction , resulting in loss of prestress.

Measures: ① use of high-grade cement, reduce the amount of cement, reducing the water-cement ratio; ② the use of well-graded aggregate, strengthen vibration, increase the density of concrete; ③ strengthen conservation in order to reduce shrinkage of concrete, ④ control concrete stress σpc, require in order to prevent the occurrence of nonlinear creep.

6 ring reinforcement loss σl6 reasons: an annular member with spiral prestressing steel for reinforcement of concrete due to prestressing losses caused partial extrusion.

Inquiry >>
Products you need :
Your name :
Your tel :
* Your mail :
Your company :
Your country :
* Inquiry :
 
hydroseeding equipment for sale automatic grouting station container type grout mixer with agitator Inverter speed high pressure grouting pump electrical refractory gunning machine concrete planetary mixer dry and wet shotcrete machine for sale high pressure hose pump hydraulic jack CLC brick block making machine ceramic mud pump mud pump packaging portable hydraulic drive DTH drilling machine screw plastering pump with mixer marking removal machine electric concrete mixer pump hydraulic pumping station DTH drill bit scraper conveyor
GHS15190 Hydroseeding equipment GGP1000/2X75/100PI-E Automatic Grouting Station GMA30 Automatic mixing plant and HCS17B cement silo GGP440/50PI-22E Inverter speed high pressure grouting pump GZ-3ER/S Electrical refractory gunning machine GCPM UHPC planetary concrete mixer for sale GSZ-10S/E Electric shotcrete machine (dry and wet) GH100-915B Super high pressure bentonite hose pump Double acting hydraulic jack GF5H CLC foam concrete making machine Hydraulic ceramic piston pump BW850-2 Mud Pump GPD100H Portable hydraulic drive DTH drilling machine GMP-5X Mortar plastering machine with mixer and screw pump GD-D390 Marking Removal Machine JBT40 P2 Electric concrete mixer pump GBHPP15/55X2-30D Hydraulic power unit DTH High pressure drill bit GSC500H Scraper Conveyor
hydroseeding equipment for sale automatic grouting station container type grout mixer with agitator Inverter speed high pressure grouting pump electrical refractory gunning machine concrete planetary mixer dry and wet shotcrete machine for sale high pressure hose pump hydraulic jack CLC brick block making machine ceramic mud pump mud pump packaging portable hydraulic drive DTH drilling machine screw plastering pump with mixer marking removal machine electric concrete mixer pump hydraulic pumping station DTH drill bit scraper conveyor
GHS15190 Hydroseeding equipment GGP1000/2X75/100PI-E Automatic Grouting Station GMA30 Automatic mixing plant and HCS17B cement silo GGP440/50PI-22E Inverter speed high pressure grouting pump GZ-3ER/S Electrical refractory gunning machine GCPM UHPC planetary concrete mixer for sale GSZ-10S/E Electric shotcrete machine (dry and wet) GH100-915B Super high pressure bentonite hose pump Double acting hydraulic jack GF5H CLC foam concrete making machine Hydraulic ceramic piston pump BW850-2 Mud Pump GPD100H Portable hydraulic drive DTH drilling machine GMP-5X Mortar plastering machine with mixer and screw pump GD-D390 Marking Removal Machine JBT40 P2 Electric concrete mixer pump GBHPP15/55X2-30D Hydraulic power unit DTH High pressure drill bit GSC500H Scraper Conveyor
COPYRIGHT © GAODE EQUIPMENT CO.,LTD. Site Index Product IndexPrivacy Policy Technical Support:coverweb

113