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1981年我公司在上海色织四厂工程中与华东建筑设计院选定采用天津第六金属制品厂生产的φ~j12(7φ4)高强钢绞线作预应力筋。确定用外形比较整齐、国内有成熟配套张拉工具的JM-12-6型锚具。为探索拟定的张拉工艺、操作规程和锚具性能,我们做了2根模拟梁,并制作和张拉了20m+20m足尺大梁,总结了张拉工艺、操作规程与锚具性能,对原JM-12-6型钢绞线锚具进行了改进。在上海色织四厂主体工程中,应用96套JM_F-12-6型锚具顺利地按设计要求完成张拉。现将我公司改进的JM_F-12-6型锚具介绍如下。一、JM_F-12-6型钢绞线锚具 JM_F-12-6型钢绞线锚具分为工作锚与工具锚两种类型,以便工作锚具一次性安装
In 1981, our company selected the φ~j12(7φ4) high strength steel strand produced by Tianjin No.6 Metal Products Factory as prestressed tendons in the Shanghai Yarn Yarn Project and East China Architectural Design Institute. Determine the JM-12-6 type anchors with relatively neat appearance and domestic mature tensioning tools. In order to explore the proposed tensioning process, operating procedures, and anchorage performance, we created 2 simulated beams and produced and tensioned 20m+20m full-scale girders, summarizing the tensioning process, operating procedures and anchorage performance. The original JM-12-6 steel strand anchors were improved. In the main project of Shanghai Sezhi No. 4 Factory, 96 sets of JM_F-12-6 type anchors were successfully completed according to the design requirements. The JM_F-12-6 type anchors improved by our company are introduced as follows. I. JM_F-12-6 steel strand anchors JM_F-12-6 steel strand anchors are divided into two types of work anchors and tool anchors, so that the work anchorage can be installed at one time.