Non-load crack prevention method for layered pouring of zero block web plate

A technology of layered pouring and prevention method, applied in construction, bridge construction, bridges, etc., can solve the problem of no prevention/avoidance measures, and achieve the effect of preventing cracks, reducing temperature rise, and improving bearing capacity

Active Publication Date: 2012-06-27
GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this phenomenon has not attracted enough attention. At present, there are no corresponding preventive / avoidable measures in the construction of block 0#

Method used

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  • Non-load crack prevention method for layered pouring of zero block web plate
  • Non-load crack prevention method for layered pouring of zero block web plate
  • Non-load crack prevention method for layered pouring of zero block web plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] As shown in the accompanying drawings, the non-load crack prevention method of the zero block web layered pouring of the present invention is to pre-embed thick-walled metal pipes in the upper concrete of the zero block web layered layered pouring, and the method includes the following successively step:

[0034] Step 1: Prepare cooling pipes of corresponding specifications according to the web thickness, including A cooling pipe and B cooling pipe. Cooling tubes with a thickness of 3.0mm, of which the outer diameter of cooling tube A is 42.3mm, and the outer diameter of cooling tube B is 48.0mm.

[0035] Step 2: After the first layer of concrete pouring is completed, after 2 days of curing, start to bind the second layer of steel bars and install the formwork, then bend the cooling pipe in the longitudinal direction to make it return to the shape and fix it on the steel bar, and the cooling pipe needs to be arranged vertically The height of the cooling pipe on the bot...

Embodiment 2

[0040] As shown in the accompanying drawings, the non-load crack prevention method of the zero block web layered pouring of the present invention is to pre-embed thick-walled metal pipes in the upper concrete of the zero block web layered layered pouring, and the method includes the following successively step:

[0041]Step 1: Prepare cooling pipes of corresponding specifications according to the web thickness, including A cooling pipe and B cooling pipe. The diameter is 48.0mm, the wall thickness is 3.0mm, the outer diameter of B cooling tube is 60.0mm, and the wall thickness is 5.0mm.

[0042] Step 2: After the first layer of concrete pouring is completed, after 2 days of curing, start to bind the second layer of steel bars and install the formwork, then bend the cooling pipe in the longitudinal direction to make it return to the shape and fix it on the steel bar, and the cooling pipe needs to be arranged vertically The height of the cooling pipe is 2.70m, the distance betw...

Embodiment 3

[0047] As shown in the accompanying drawings, the non-load crack prevention method of the zero block web layered pouring of the present invention is to pre-embed thick-walled metal pipes in the upper concrete of the zero block web layered layered pouring, and the method includes the following successively step:

[0048] Step 1: Prepare cooling pipes of corresponding specifications according to the web thickness, including A cooling pipe and B cooling pipe. The diameter is 33.5mm, the wall thickness is 3.0mm, the outer diameter of B cooling tube is 33.5mm, and the wall thickness is 4.0mm.

[0049] Step 2: After the first layer of concrete pouring is completed, after 2 days of curing, start to bind the second layer of steel bars and install the formwork, then bend the cooling pipe in the longitudinal direction to make it return to the shape and fix it on the steel bar, and the cooling pipe needs to be arranged vertically The height of the cooling pipe on the bottom layer is 2.0...

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Abstract

The invention relates to a non-load crack prevention method for layered pouring of a zero block web plate. In the method, a thick-wall metal pipe is pre-buried into upper layer concrete which is poured on the zero block web plate in a layered way. The method comprises the following steps of: I, preparing cooling pipes of corresponding specifications including a cooling pipe A and a cooling pipe B according to the thickness of the web plate; II, arranging the cooling pipes; III, performing leak detection on the cooling pipes; IV, opening the water inlets and the water outlets of the cooling pipes after a square of concrete is put into a mold for 5-10 hours, filling cooling water into the water inlets of the cooling pipes, and adjusting the flow speed of the cooling water according to specific conditions; and V, after cooling is complete, pouring cement mortar into the cooling pipes and enclosing the cooling pipes. Due to the adoption of the prevention method, the internal heat dissipating time of the concrete is shortened, the temperature rise of the concrete is reduced, pulling stress is avoided, and cracks are prevented effectively; and moreover, the method is easy to operate, and does not influence a construction process.

Description

technical field [0001] The invention relates to a method for preventing concrete pouring cracks, in particular to a method for preventing non-load cracks in layered pouring of 0# (number zero) web plates. Background technique [0002] The early crack pre-development of concrete is a key point in the quality control of concrete engineering and an important factor affecting the structure's use function, appearance quality and durability. In recent years, the cracking phenomenon of bridges, tunnel linings and other concrete structures with small component sizes has been increasing, and the heat of hydration and temperature changes have become one of the main reasons for concrete cracking. Especially in the construction process of long-span rigid-frame bridges, non-load cracks are more likely to appear in the caps, piers and 0# blocks of box girders. Among them, the 0# block is consolidated with the pier and is the main body of the upper structure of the bridge, so the structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
Inventor 郝天之高建明吴进星谢肖礼王淑英邱波罗月静张磊梁茜雪蒋国富刘世建戴文远李淑芬李春齐孙振周
Owner GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD
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