Hollow bar micropiles for structuresí stability

Veröffentlicht von: hollowanchor
Veröffentlicht am: 26.09.2017 11:03
Rubrik: Industrie & Handwerk


(Presseportal openBroadcast) - Hollow Bar Micropiles have emerged since the early to mid 1990ís as an economical system for installation primarily in soils. This type of micropile is easily installed in low headroom or restricted access applications and exhibits high unit load capacities coupled with superior stiffness performance compared to conventional drilled and grouted ground anchors without the need for temporary or permanent casing.

Hollow Bar Micropiles are fully bonded, drilled and grouted micropiles which consist of segments of load carrying hollow threaded bars, couplers and a sacrificial drilling bit that are bonded to soil or rock by a neat water-cement grout. They are installed by drilling with the hollow bar assembly and flushing the hole with the micropile grout. Due to the installation procedures used, hollow bar micropiles are especially advantageous in subsurface conditions where casing might otherwise need to be employed with conventional micropile configurations. The manner in which hollow bar micropiles are installed results in higher grout to ground bond stresses and greater axial stiffness than conventional solid anchors or uncased micropiles that are drilled and subsequently gravity grouted. Hollow Bar Micropiles are also known as Injection Bore Micropiles or Self Drilling Micropiles.
Self drilling hollow barís designed tension is mainly depended by possibility, reliability and convenience of construction technique.

If tension designs too big, accordingly, the cross section and gravity are big, then it is difficult for inserting into hole and construction quality cannot be guaranteed, also itís not easy to handle if tension test and validation test have problems; if tension designs too small, the amount of hollow anchor bolt should need many and the price costs high.

After confirming self drilling hollow barís tension, the design of cross section should depend on the design method of tensile bar, at the same time, the demand of construction should be readjusted if necessary.

The hollow anchor boltís head coupling should be designed basing on the principle design of prestressing force.

After confirmation of hollow anchor bolt, itís necessary to calculate structuresí stability. If stability of structures canít reach demand, the design of hollow anchor bolt should be reconsidered even if the design of every part of anchor bolt is reasonable and economic. Lengthening hollow anchor bolt, calculating again and consulting relevant calculation method to ensure stability of soil and rock, quality of projects.
More from http://www.hollowbar.org/

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Hollow Bar Micropiles have emerged since the early to mid 1990ís as an economical system for installation primarily in soils. This type of micropile is easily installed in low headroom or restricted access applications and exhibits high unit load capacities coupled with superior stiffness performance compared to conventional drilled and grouted ground anchors without the need for temporary or permanent casing.

Hollow Bar Micropiles are fully bonded, drilled and grouted micropiles which consist of segments of load carrying hollow threaded bars, couplers and a sacrificial drilling bit that are bonded to soil or rock by a neat water-cement grout. They are installed by drilling with the hollow bar assembly and flushing the hole with the micropile grout. Due to the installation procedures used, hollow bar micropiles are especially advantageous in subsurface conditions where casing might otherwise need to be employed with conventional micropile configurations. The manner in which hollow bar micropiles are installed results in higher grout to ground bond stresses and greater axial stiffness than conventional solid anchors or uncased micropiles that are drilled and subsequently gravity grouted. Hollow Bar Micropiles are also known as Injection Bore Micropiles or Self Drilling Micropiles.
Self drilling hollow barís designed tension is mainly depended by possibility, reliability and convenience of construction technique.

If tension designs too big, accordingly, the cross section and gravity are big, then it is difficult for inserting into hole and construction quality cannot be guaranteed, also itís not easy to handle if tension test and validation test have problems; if tension designs too small, the amount of hollow anchor bolt should need many and the price costs high.

After confirming self drilling hollow barís tension, the design of cross section should depend on the design method of tensile bar, at the same time, the demand of construction should be readjusted if necessary.

The hollow anchor boltís head coupling should be designed basing on the principle design of prestressing force.

After confirmation of hollow anchor bolt, itís necessary to calculate structuresí stability. If stability of structures canít reach demand, the design of hollow anchor bolt should be reconsidered even if the design of every part of anchor bolt is reasonable and economic. Lengthening hollow anchor bolt, calculating again and consulting relevant calculation method to ensure stability of soil and rock, quality of projects.
More from http://www.hollowbar.org/

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