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A manufacture method of concrete reserved hole

A manufacturing method and a technology for reserving holes, which are applied in erecting/assembling bridges, bridges, buildings, etc., can solve the problems that steel bars 1 are easy to rust, difficult to pull out, and slide down, so as to ensure construction quality, prolong service life, The effect of improving the adhesive performance

Inactive Publication Date: 2019-01-04
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Adopting the above-mentioned construction method will cause many steel rods 1 used for the reserved holes 4 to remain in the holes in the early stage of construction, making it difficult to pull out; problems will also occur in the later stage. During the operation of the bridge, the steel rods 1 are easily rust, and because the bonding surface between the concrete 3 changes, with the inner wall of the steel rod 1 as the bonding surface, it is difficult for the new concrete 3 to bond successfully, resulting in a sliding phenomenon (see Figure 4 ), affecting the service life of concrete 3

Method used

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  • A manufacture method of concrete reserved hole
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  • A manufacture method of concrete reserved hole

Examples

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Embodiment 1

[0039] Embodiment 1: a kind of method for making concrete reserved hole, such as Figure 5 to Figure 8 shown, including the following steps:

[0040] 1.1 To prepare latex starch mixed solution A, first add latex to dilute with water, stir evenly, then add starch to the latex, stir evenly to form latex starch mixed solution A;

[0041] 1.2 Wrap latex starch mixed solution A and paper towel 21 on the surface of the steel rod 1 from inside to outside in turn, and dry until the surface of the steel rod 1 forms a gelatinous film 2;

[0042] 1.3 Embed the processed steel rod 1 in the position corresponding to the reserved hole 4, and pour concrete 3;

[0043] 1.4 After the concrete 3 is dry, pull out the steel rod 1 to form a reserved hole 4 .

[0044] 1.5 Remove the paper towel 21 remaining on the inner wall of the reserved hole 4: fill the reserved hole 4 with water, soak for 1-2 hours, soften the paper towel 21, and use the special tool 5 to mash and scrape the softened paper t...

Embodiment 2

[0051] Embodiment 2: a kind of method for making concrete reserved holes, the difference with embodiment 1 is that the mass and number ratio of water, latex and starch in latex starch mixed solution A is 0.9:1:1.3, in this proportioning Under this condition, it can be guaranteed that the colloidal film 2 will not dry completely within 33 days, and the mass-number ratio of water, latex and starch can be selected according to the construction progress and construction difficulty, so as to ensure economical efficiency.

Embodiment 3

[0052] Embodiment 3: a kind of method for making concrete reserved holes, the difference with embodiment 1 is that the mass and number ratio of water, latex and starch in latex starch mixed solution A is 1.1:1:1.5, in this proportioning Under this condition, it can be guaranteed that the colloidal film 2 will not dry completely within 20 days, and the mass-number ratio of water, latex and starch can be selected according to the construction progress and construction difficulty, so as to ensure economical efficiency.

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Abstract

The invention discloses a manufacture method of concrete reserved hole, belonging to the field of civil engineering, and the technical points thereof are as follows. The method comprises the followingsteps: preparing a latex starch mixed solution A, firstly adding the latex to water for dilution, stirring uniformly, and then adding starch in the latex; stirring evenly to form latex starch mixed solution A; putting latex starch mixed solution A and paper towel on the surface of a steel rod from inside to outside, drying to the surface of steel rod until a gel-like film is formed; embedding thetreated steel rod in corresponding position of the reserved hole, pouring the concrete; after the concrete is dried, pulling out the steel rod to form a reserved hole.The method can make the steel bar pull out smoothly, and has the advantages of improving the bonding performance between the new and the old concrete and prolonging the service life of the concrete. The method is applicable to the preparation of concrete reserved holes.

Description

technical field [0001] The invention relates to a method for embedding reserved holes in concrete slabs, in particular to a method for making reserved holes in concrete. Background technique [0002] At present, in the construction process of bridge projects, especially in the process of assembling bridges with prefabricated segments, construction personnel need to leave holes on the surface of the bridge. This method is to facilitate temporary fixing of hanging baskets and other facilities at the construction site. In the past, construction workers used hollow steel rods 1 to make reserved holes 4 (see figure 1 ), with a diameter in the range of about 2-4cm, and then install construction tools such as hanging basket 6 (see figure 2 ). After the partial construction of the bridge is completed, the hanging basket 6 will be removed and the reserved hole 4 will be filled with concrete 3 (see image 3 ). [0003] Adopting the above-mentioned construction method will cause m...

Claims

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Application Information

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IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 张建东董汉青焦景怡景磊
Owner NANJING UNIV OF TECH
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