Track bed surface waterproof layer expansion joint structure

A technology for expansion joints and subgrade surfaces, applied in the direction of tracks, roads, ballast layers, etc., can solve problems affecting the smoothness and driving safety of ballastless tracks, low freeze-thaw resistance and durability, and weak interface adhesion. problems, to achieve good water immersion stability, good resistance to displacement deformation and anti-peeling strength, and good waterproof and sealing effect

Inactive Publication Date: 2019-03-19
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane sealant is an organic material with low freeze-thaw resistance and durability. At the same time, the interface with the concrete waterproof layer (inorganic material) is not strongly bonded and is easily damaged, making the expansion joints of the waterproof layer the main source of surface water infiltration into the roadbed. Passage, resulting in roadbed diseases such as frost heaving and thawing, affecting the smoothness and driving safety of ballastless track

Method used

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  • Track bed surface waterproof layer expansion joint structure
  • Track bed surface waterproof layer expansion joint structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The expansion joint structure of the waterproof layer of the track subgrade in this embodiment includes a caulking plate 1, a backing material 2, a neoprene hollow elastic tube 3 and a sealant layer 4 arranged in the expansion joint from bottom to top;

[0017] The backing material is prepared in the following manner:

[0018] Mix acetone and epoxy resin and stir evenly, then add iron powder and aluminum powder, stir evenly, let stand for 2 hours, discharge some air bubbles, then add triethylenetetramine, stir evenly quickly, pour into the mold and let stand at a temperature of 20°C 25min, and then keep warm at 100°C for 2.5h; the mass ratio of the iron powder to the epoxy resin is 3:1; the mass ratio of the aluminum powder to the epoxy resin is 2:1;

[0019] The hollow elastic tubes are longitudinally distributed along the expansion joints, and the caulking plate 1, the backing material 2, the neoprene hollow elastic tubes 3 and the sealant layer 4 are bonded and fixed...

Embodiment 2

[0024] The expansion joint structure of the waterproof layer of the track subgrade in this embodiment includes a caulking plate 1, a backing material 2, a neoprene hollow elastic tube 3 and a sealant layer 4 arranged in the expansion joint from bottom to top; The backing material is prepared by:

[0025] Mix acetone and epoxy resin and stir evenly, then add iron powder and aluminum powder, stir evenly, let it stand for 2 hours, discharge some air bubbles, then add triethylenetetramine and stir evenly, pour it into the mold and let it stand at a temperature of 30°C 35min, and then keep warm at 100°C for 3.5h; the mass ratio of the iron powder to the epoxy resin is 4.5:1; the mass ratio of the aluminum powder to the epoxy resin is 3.5:1;

[0026] The hollow elastic tubes are longitudinally distributed along the expansion joints, and the caulking plate 1, the backing material 2, the neoprene hollow elastic tubes 3 and the sealant layer 4 are bonded and fixedly connected to the ex...

Embodiment 3

[0031] The expansion joint structure of the waterproof layer of the track subgrade in this embodiment includes a caulking plate 1, a backing material 2, a neoprene hollow elastic tube 3 and a sealant layer 4 arranged in the expansion joint from bottom to top; The backing material is prepared by:

[0032] Mix acetone and epoxy resin and stir evenly, then add iron powder and aluminum powder, stir evenly, let stand for 2 hours, discharge some air bubbles, then add triethylenetetramine, stir evenly quickly, pour into the mold and let stand at a temperature of 20°C 35min, and then keep warm at 100°C for 2.5h; the mass ratio of the iron powder to the epoxy resin is 4.5:1; the mass ratio of the aluminum powder to the epoxy resin is 3.5:1;

[0033]The hollow elastic tubes are longitudinally distributed along the expansion joints, and the caulking plate 1, the backing material 2, the neoprene hollow elastic tubes 3 and the sealant layer 4 are bonded and fixedly connected to the expansi...

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Abstract

The invention discloses a track bed surface waterproof layer expansion joint structure. The track bed surface waterproof layer expansion joint structure comprises a caulking plate, a backing material,hollow elastic neoprene tubes and a sealant layer which are arranged in an expansion joint from bottom to top; the backing material is prepared through the following steps that acetone and epoxy resin are mixed and stirred to be uniform, then iron powder and aluminum powder are added and stirred to be uniform, the mixture is subjected to standing for 2 h, part of bubbles are discharged, then triethylene tetramine is added and rapidly stirred to be uniform, the mixture is poured into a mold and subjected to standing for 25-35 min at 20-30 DEG C, and then heat preservation is performed for 2.5-3.5 h at 100 DEG C. The track bed surface waterproof layer expansion joint structure is a multilayer structure and is good in waterproof sealing effect, high in durability and higher in structural strength.

Description

technical field [0001] The invention relates to a road expansion joint material, in particular to an expansion joint structure of a waterproof layer of a track subgrade surface. Background technique [0002] The smoothness of ballastless track of high-speed railway seriously affects the ride comfort and safe operation of passengers. The subgrade is the foundation of the ballastless track, and the freezing problem of the subgrade of high-speed railways in cold regions such as Northeast China seriously affects the smoothness of the ballastless track. Therefore, in cold regions, preventing subgrade freezing and swelling is a key issue in the construction, operation and maintenance of high-speed railways. Among the various technical measures to prevent the subgrade from freezing, the design and construction of the waterproof layer of the subgrade surface is the key link, and the sealing of the expansion joints of the waterproof layer is very important. At present, polyurethane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B1/00E01B2/00C08L63/00C08K3/08C08G18/32C08G18/48C08G18/58C08G18/67C08G18/76C08G18/79C09J175/14C09J11/04C09J11/06
CPCC08G18/324C08G18/4812C08G18/4825C08G18/4829C08G18/58C08G18/6755C08G18/7614C08G18/7671C08G18/794C08K3/08C08K2003/0812C08K2003/0856C09J11/04C09J11/06C09J175/14E01B1/00E01B2/00C08L63/00C08G18/0823C08L83/04C08K9/06C08K3/36C08K5/544C08K5/5435
Inventor 王羽唐志添刘丽严鑫
Owner CHONGQING JIAOTONG UNIVERSITY
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