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0# block bracket prestress pre-pressing construction method

A prestressing and bracketing technology, applied in the erection/assembly of bridges, bridges, buildings, etc., can solve the problems of long construction period, difficulty in water intake and hoisting, high cost, etc., and achieve the effect of ensuring the effect of preloading

Inactive Publication Date: 2019-07-23
陕西路桥集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, it is common to use sandbags or water tanks to preload the brackets. Due to the limitations of the site (the height of the pier ranges from 76m to 175m) and natural conditions (sufficient water source), if sandbags or water tanks are used for preloading, it is very difficult to fetch water and hoist. And there are many processes, long construction period and high cost

Method used

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  • 0# block bracket prestress pre-pressing construction method
  • 0# block bracket prestress pre-pressing construction method
  • 0# block bracket prestress pre-pressing construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Refer to attached Figure 1-3 As shown, a 0# block bracket prestressing preloading method includes the following steps:

[0047] Step 1: Install the jack 6, the support frame and the reaction frame, place the support frame on the bracket 2, and connect the reaction frame to the pier body 1;

[0048] Step 2: Set a dial indicator at the root of the horizontal section of bracket 2, and set a total station to detect the axis offset of pier body 1;

[0049] Step 3: Carry out baseline measurement before preloading, read the initial value of each dial indicator, and record the initial value of the total station;

[0050]Step 4: Pressurize the jack 6 times at intervals to 120% of the load. After each pressurization, keep reading the dial indicator and record the deviation of the pier body 1 axis in the total station.

[0051] In traditional construction, water tanks or sandbags are used for preloading. On the one hand, due to the limitation of the site and natural conditions,...

Embodiment 2

[0064] Please refer to Figure 1-3 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a method for erecting a support frame and a reaction force frame and optimizes the structure, making the whole more stable and more convenient to erect.

[0065] In this embodiment, step 1 includes the following steps:

[0066] Step 1.1: Install the bracket 2 on the pier body 1 through the pre-embedded plate and the connecting plate, and the brackets 2 on both sides of the pier body 1 are pulled through the fine-rolled threaded steel bars;

[0067] Step 1.2: Set up the horizontal I-beam on the bracket 2, lay the distribution beam 4 on the first horizontal I-beam 3, place the second horizontal I-beam 5 on the distribution beam 4, and place on the second horizontal I-beam jack6;

[0068] Step 1.3: Place the load-bearing beam 7 on the jack 6, place the shoulder-pole beam 8 on the load-bearing beam 7, and connect the shoulder-pole beam 8 to the pi...

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Abstract

The invention provides a 0# block bracket prestress pre-pressing construction method. The 0# block bracket prestress pre-pressing construction method includes the following steps that 1, a jack counterforce frame is carried, and the counterforce frame is placed on a bracket and connected with a pier body; 2, dialgages are arranged at the root part of the horizontal section of the bracket, and a total station is arranged to detect offset of the axis of the pier body; 3, reference measurement is conducted before pre-pressing, initial values of all the dialgages are read, and the initial value ofthe total station is recorded; 4, a jack is pressurized to 120% of the load at multiple times and intervals, maintaining is conducted after each pressurizing, then the dialgages are read, and the offset of the axis of the pier body in the total station is recorded. Through the scheme, the counterforce frame and the jack are used to realize the effect of pressurizing, series of inconveniences caused by traditional sandbags or water tanks are removed, deformation measurement of the bracket and the pier body can be realized through the dialgages and the total station, delicate data measurement is guaranteed, and whether requirements are met or not is judged.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a prestressing and preloading construction method for 0# block brackets. Background technique [0002] In the technical field of bridge 0# block construction, pre-embedded brackets are used for the construction of 0# block concrete, and the deformation of the brackets has a crucial impact on the quality of 0# concrete and the alignment of the beam body. Under the action of three-dimensional prestress and fulcrum reaction force, the 0# block is in a complex stress state, and the uneven deformation between them causes stress concentration on the floor and ribs near the fulcrum. Therefore, it is necessary to reduce the deformation of the bracket through preloading, prevent cracking, and improve the alignment of the beam body; at the same time, the safety of the bracket structure can be checked to prevent accidents. [0003] Among them, it is common to use sandbags or water tanks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 杨武策任万鹏朱其涛赵汉军李莼陈超
Owner 陕西路桥集团有限公司
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