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A Relay Grouting Technology for 200m Box Girder Hole

A tunnel and box girder technology, applied in the field of relay grouting for 200m box girder tunnels, can solve problems such as failure to fill in, grouting pipes and outlet pipes burst, and failure to successfully complete grouting for 200m tunnels, so as to improve grouting speed and reduce pressure , to ensure the overall effect

Active Publication Date: 2020-08-04
NO 1 ENG COMPANY CO LTD OF CCCC FIRST HARBOR ENG COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the traditional grouting construction method, the grouting method of single-end grouting machine is basically adopted, and the maximum grouting pressure reaches 0.95MPa. For the grouting of 200m tunnels, due to the long tunnels, the pressure of the slurry will be greater than 1MPa. The pressure is too high to prevent the grouting of the 200m hole, and the grouting pipe and the air outlet pipe are in danger of bursting

Method used

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  • A Relay Grouting Technology for 200m Box Girder Hole
  • A Relay Grouting Technology for 200m Box Girder Hole
  • A Relay Grouting Technology for 200m Box Girder Hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A 200m box girder tunnel relay grouting process, comprising the following steps:

[0058] ①Install the grout cap

[0059] Before grouting, on-site technicians should strictly check the bolt connection between the grouting cap and the bell mouth, the connection between the grout hole and the grout pipe 4, and the connection between the valve and the grout pipe 4. Loosening is not allowed at all connections to prevent pressure Grout leakage occurs during the grouting process, while ensuring good airtightness of the entire prestressed channel 5;

[0060] ②Clean the prestressed tunnel

[0061] Use water to clean the dust and dirt on the surface of the tunnel 5 and the prestressed tendons. On the one hand, it is to check whether the slurry outlet pipe 4 is blocked. Inject clean water directly from one end of the tunnel 5 until the slurry outlet pipe 4 at the other end flows out of the clean water and stop water injection, and use an air compressor to press air from one sid...

Embodiment 2

[0080] A 200m box girder tunnel relay grouting process, comprising the following steps:

[0081] ①Install the grout cap

[0082] Before grouting, on-site technicians should strictly check the bolt connection between the grouting cap and the bell mouth, the connection between the grout hole and the grout pipe 4, and the connection between the valve and the grout pipe 4. Loosening is not allowed at all connections to prevent pressure Grout leakage occurs during the grouting process, while ensuring good airtightness of the entire prestressed channel 5;

[0083] ②Clean the prestressed tunnel

[0084] Use water to clean the dust and dirt on the surface of the tunnel 5 and the prestressed tendons. On the one hand, it is to check whether the slurry outlet pipe 4 is blocked. Inject clean water directly from one end of the tunnel 5 until the slurry outlet pipe 4 at the other end flows out of the clean water and stop water injection, and use an air compressor to press air from one sid...

Embodiment 3

[0103] A 200m box girder tunnel relay grouting process, comprising the following steps:

[0104] ①Install the grout cap

[0105] Before grouting, on-site technicians should strictly check the bolt connection between the grouting cap and the bell mouth, the connection between the grout hole and the grout pipe 4, and the connection between the valve and the grout pipe 4. Loosening is not allowed at all connections to prevent pressure Grout leakage occurs during the grouting process, while ensuring good airtightness of the entire prestressed channel 5;

[0106] ②Clean the prestressed tunnel

[0107] Use water to clean the dust and dirt on the surface of the tunnel 5 and the prestressed tendons. On the one hand, it is to check whether the slurry outlet pipe 4 is blocked. Inject clean water directly from one end of the tunnel 5 until the slurry outlet pipe 4 at the other end flows out of the clean water and stop water injection, and use an air compressor to press air from one sid...

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Abstract

The invention discloses a 200m box girder duct relaying grouting process. The 200m box girder duct relaying grouting process comprises the following steps that 1, a filling cap is mounted; 2, a prestressed duct is cleaned; 3, slurry is prepared, wherein the slurry is prepared from, by weight, 100 parts of 425 Portland cement, 33 parts of water and 5 parts of additive; 4, duct grouting is carried out; 5, demounting and cleaning are carried out. According to the 200m box girder duct relaying grouting process, a relaying grouting point is additionally arranged at the highest position of the ductthrough a steel sleeve, the slurry is pressed to the final position through the joint pressure of an initial grouting point and the relaying grouting point, pressure in the duct is small, and the integrality of the slurry is guaranteed; a grouting pipe and an air outlet pipeline cannot burst, continuous grouting can be achieved, the grouting speed is increased, and the grouting quality of the ductis ensured.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a relay grouting process for a channel of a 200m box girder. Background technique [0002] The commonly used cast-in-place box girder structure is a bridge box girder structure within 150m. In China, single-span and single-section prefabricated structures are mostly used. Due to geographical limitations and restrictions on prefabricated installation sites, cast-in-place post-tensioned boxes can be used. Beam structure, cast-in-place post-tensioned box girder is also a structure used in bridge engineering. With the rapid development of bridge construction at home and abroad, the requirements for bridge span are getting higher and higher, the span increases, and the bridge monomer increases, especially In the limited or complex environment, the use of 200m channel cast-in-place box girder will be more and more. [0003] For the traditional grouting construction method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00C04B28/04C04B111/70
CPCC04B28/04C04B2111/00724C04B2111/70E01D21/00
Inventor 尹景燕安秀山张长财刘俊付培培王祾刘泳志翟永贞吴浩
Owner NO 1 ENG COMPANY CO LTD OF CCCC FIRST HARBOR ENG COMPANY
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