Installation Method Of Prestressed Anchorage And Calculation Method Of Blanking Length
Release time:
2021-06-05
Do you understand the construction and installation methods of prestressed anchors? How to calculate the blanking length of prestressed tendons?
Do you understand the construction and installation methods of prestressed anchors? How to calculate the blanking length of prestressed tendons? Do you know, know one or don't know it, it doesn't matter. Today, I want to talk to you about this aspect. Through the detailed description below, I hope to bring you help.
The construction and installation method of prestressed anchors is a small anchor construction and installation. It is a simple construction with a diameter of 28-75mm and a depth of 1~Sm in the rock where the anchor is installed. The simple construction can be drilled or manually drilled. And then charge explosives in the simple construction. The simple construction method can be used to excavate foundation pits, mine stone, loose frozen soil, etc.
1. The general method of construction and installation of anchors is to place a small amount of explosives at the bottom of the blast hole. After several anchor constructions and installations, it expands into a spherical shape, and finally the explosives are installed for the construction and installation of the anchors. Compared with the blast hole anchor construction and installation method, this method has the advantages of good anchor construction and installation effect, high work efficiency, fast progress, and low explosive consumption. This method is often used in the construction and installation of short pile anchors on shallow foundations.
2. The construction and installation of complex anchors is through certain technical measures to strictly control the explosion energy and explosion scale, so that the sound, vibration, damage area and the collapse range of broken objects during the construction and installation of anchors are controlled within the specified limits. In cities and factories, complex old bridge buildings or structures, such as buildings, factories, chimneys, water towers, and various foundations, are often required, and complex anchors are often used for construction and installation.
The blanking length of the prestressed tendons must meet the requirements of use, and the mobile crushing station must also prevent the waste from being too long. The calculation of the blanking length of the pre-stressed finish-rolled rebar should consider factors such as the type of pre-stressed bar, the form of anchorage, the elastic retraction rate, the length of the tensile extension, the length of the component channel, the tensile equipment and the construction method, etc., due to the prefabrication The beam is tensioned at both ends, so the length of each strand is determined by the following formula: L=L0+2 (L1+L2+L3+L4) where L0--the length of the channel of the component; L1--the thickness of the working anchor ; L2-jack length; L3-tool anchor thickness; L4--length margin; (usually 100mm).
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