CN115839060A - Waterproof system structure for repairing ballastless track railway bridge floor waterproof layer and construction method thereof - Google Patents

Abstract

The invention relates to a waterproof system structure for repairing a ballastless track railway bridge floor waterproof layer and a construction method thereof. The waterproof system structure combines the traditional waterproof layer and the surface coating layer into a whole, has the high physical mechanical property of the traditional waterproof layer and the high weather resistance and aging resistance of the surface coating layer, and meets the requirements of the national standard or technical conditions for the concrete bridge surface waterproof of the ballastless track railway.

Description

Waterproof system structure for repairing ballastless track railway bridge floor waterproof layer and construction method thereof

Technical Field

The invention belongs to a ballastless track railway bridge floor waterproof layer repairing technology, and particularly relates to a waterproof system structure for repairing a ballastless track railway bridge floor waterproof layer and a construction method thereof.

Background

The railway concrete bridge is designed based on durability, and a waterproof layer is required to be arranged on a bridge floor in the construction process of the railway concrete bridge so as to prevent the bridge structure from being damaged and destroyed by rainwater infiltration, and the railway concrete bridge is an important technical means for improving the durability of the bridge structure.

The railway concrete bridge in China is generally waterproof by using coiled materials or coatings, relatively speaking, the coatings used as waterproof layers have the defects of difficult lap joint, poor adhesion, unsatisfactory detail treatment effect and the like of the coiled materials, and the development trend of railway concrete bridge deck waterproofing is realized by adopting high-performance coatings. In the early-stage high-speed railway construction, high-performance waterproof coating is widely used by referring to foreign experience, wherein polyurea is largely used for a bridge deck waterproof layer adopting CRTS II type slab ballastless tracks. However, in the later operation and maintenance process, the polyurea waterproof layer is found to be partially yellowed, damaged or even peeled off.

In the current operation of China, the maintenance work of railways is mainly carried out in a window period, namely 0 to 4 at night. The maintenance time is short, the actual construction time is probably less than 3 hours except the processes of inspection of an upper operation door and a lower operation door, and large-scale mechanical equipment cannot be transported to a construction site of the bridge floor through the operation doors. The existing relevant waterproof technical standards of ballastless track railway bridges mainly aim at newly-built railway projects, the waterproof system is complex in structure, the construction interval period among all working procedures is long, and difficulty is brought to maintenance of bridge deck waterproof layer diseases.

Disclosure of Invention

The invention aims to solve the technical problem of providing a waterproof system structure for repairing a bridge floor waterproof layer of a ballastless track railway and a construction method thereof, and solving the problem of difficulty in repairing the bridge floor waterproof layer of the conventional ballastless track.

The technical scheme adopted by the invention is as follows:

the utility model provides a ballastless track railway bridge floor waterproof layer restores and uses waterproof system structure, its includes bridge face concrete-based layer, sets up the waterproof bottom coat and the waterproof top coat of coating on the waterproof bottom coat above the bridge face concrete-based layer, the waterproof bottom coat is two ingredient polyurethane coatings, and the waterproof top coat is aliphatic polyurethane coating.

Further, the coating weight of the waterproof priming coat is more than or equal to 0.4kg per square meter.

Furthermore, the coating weight of the waterproof surface coating is more than or equal to 0.8kg per square meter, and the dry film thickness is not more than 0.6mm.

Further, the waterproof coating further comprises an original waterproof layer, a groove is formed on the original waterproof layer after the damage of the original waterproof layer is removed, and the edge of the waterproof bottom coating is lapped on the groove.

Furthermore, one end of the bridge deck concrete base layer is provided with an anti-collision wall or a water retaining platform, and the waterproof bottom coating is coated on the anti-collision wall or the water retaining platform and is 5-15cm in height.

Furthermore, a rainwater pipe is arranged on the bridge deck concrete base layer, and the waterproof bottom coating is excessively coated on the inner wall of the pipeline of the rainwater pipe from the bridge deck concrete base layer and extends into the rainwater pipe by 3-7cm.

A construction method of a waterproof system for repairing a ballastless track railway bridge floor waterproof layer comprises the following steps:

cleaning a residual original waterproof layer on the bridge deck concrete base layer;

coating a two-component polyurethane primer as a waterproof primer on the bridge deck concrete base layer;

and (3) coating an aliphatic polyurethane top coat on the surface-dried waterproof bottom coat to form a waterproof top coat.

Further, when clearing up remaining former waterproof layer, adopt the percussion drill who has flat shovel head to clear away, flat shovel head and bridge floor inclination should be less than or equal to 15 when the shovel removes, clear up the back, clear up bridge floor concrete basal layer surface with the disc polisher, clear up dross, loam and hollowing, not hard up, the honeycomb pitted skin on its surface to expose clean closely knit concrete basal layer.

Further, the waterproof primer coating is subjected to normal-temperature reaction, curing and forming, the coating weight is more than or equal to 0.4kg per square meter, and the surface drying time is 60 to 90min;

the waterproof surface coating is cured and formed at normal temperature, the coating weight is more than or equal to 0.8 kg/square meter, and the surface drying time is 90 to 120min.

Furthermore, the construction of the waterproof bottom coating and the waterproof surface coating is completed in the same window period.

The invention has the positive effects that:

the waterproof system structure combines the traditional waterproof layer and the surface coating layer into a whole, has the high physical mechanical property of the traditional waterproof layer and the high weather resistance and aging resistance of the surface coating layer, and meets the requirements of the national standard or technical conditions for the concrete bridge surface waterproof of the ballastless track railway. Need not the main equipment during construction, use traditional small-size instrument to accomplish, satisfy the bridge floor and restore the condition that can't carry the main equipment instrument.

Meanwhile, the waterproof system has the advantages of simplified structure, no redundant design, reduced construction procedures, more convenient construction and higher construction efficiency, is particularly suitable for maintenance construction in the window period of an operation railway, and is simpler and more convenient to maintain.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram according to embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram according to embodiment 4 of the present invention;

fig. 5 is a schematic structural diagram of embodiment 5 of the present invention.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

Example 1

The embodiment discloses a ballastless track railway bridge floor waterproof layer is restoreed and is used waterproof system structure, as shown in figure 1, including bridge floor concrete substrate 1, set up waterproof priming coat 2 on bridge floor concrete substrate 1 and set up waterproof surface coating 3 on waterproof priming coat 2.

The waterproof bottom coating 2 is a double-component polyurethane bottom coating, the coating amount is not less than 0.4 kg/square meter, aliphatic isocyanate is preferably adopted, and the waterproof bottom coating has good weather resistance, small component and strong seepage force.

The waterproof surface coating 3 is formed by the normal temperature reaction and solidification of high-performance aliphatic polyurethane surface coatings, the coating amount is not less than 0.8 kg/square meter, the dry film thickness is not more than 0.6mm, the tensile strength is not less than 10MPa, and the elongation at break is not less than 300 percent, so that the waterproof surface coating formed by solidification has the high physical mechanical property of a waterproof layer in a traditional waterproof system and the high weather resistance and aging resistance of the surface coating.

Example 2

The embodiment is directed at the situation that the original waterproof layer of the railway bridge floor has slight disease and only needs to be locally repaired. As shown in fig. 2, this embodiment further includes an original waterproof layer 5 on the basis of embodiment 1, and when the original waterproof layer 5 is removed by a percussion drill with a flat bit at the reserved position around the defect, an inward mode is adopted to reserve the original waterproof layer 5 without the defect, a groove 4 is formed on the original waterproof layer 5, and the waterproof bottom coating 2 for subsequent repair is overlapped with the groove 4 to form an integral waterproof layer.

Example 3

In this embodiment, the method is further limited based on embodiment 2, and as shown in fig. 3, when the defect point is located near the position of the bed plate 6, the waterproof primer layer 2 and the waterproof top coat layer 3 are not applied to the bed plate 6, and are overlapped with the original waterproof layer forming groove 4 below the bed plate.

Example 4

As shown in the attached figure 4, the embodiment is suitable for the disease located at the position of an anti-collision wall or a water retaining platform 7 of a wall surface, and at the moment, the waterproof bottom coating 2 and the waterproof surface coating 3 need to be coated on the anti-collision wall or the water retaining platform, wherein the height is 5-15cm, and is preferably about 10 cm.

Example 5

As shown in fig. 5, this embodiment is suitable for the case when the rain pipe 8 is disposed on the bridge deck concrete substrate 1, at this time, the waterproof primer layer 2 and the waterproof top coat 3 need to be coated on the inner wall of the rain pipe 8 from the bridge deck concrete substrate 1, and extend into the rain pipe 8 by 3-7cm, preferably 5cm, and the waterproof primer layer 2 and the waterproof top coat 3 in the rain pipe 8 are suitably thin, so as to facilitate the installation of the rain pipe cover.

Example 6

The embodiment provides a waterproof system construction method for repairing a ballastless track railway bridge floor waterproof layer, which specifically comprises the following steps:

s1: coating a two-component polyurethane primer as a waterproof primer on the bridge deck concrete base layer;

s2: and (3) coating a high-performance aliphatic polyurethane surface coating on the surface-dried waterproof bottom coating to form a waterproof surface coating.

Wherein, the surface treatment of the bridge deck concrete base layer 1 is carried out before the step S1, which specifically comprises the following steps: the remaining former waterproof layer 5 in 1 surface of bridge face concrete-based layer should adopt the impact that has flat shovel head to bore to clear away, and flat shovel head and bridge floor inclination should not be greater than 15 when eradicating, prevent to cause the pot hole to destroy bridge face concrete-based layer. After the treatment of the original waterproof layer 5 is completed, a disc grinding machine is adopted to clean the surface of the bridge deck concrete base layer, scum, floating soil, hollowing, loosening and honeycomb pitted surface on the surface of the bridge deck concrete base layer are cleaned, and a clean and compact concrete base layer is exposed.

Wherein, clear away clean back at bridge floor concrete base, should adopt the brush to carry out waterproof under coat construction to bridge floor outlet, corner, erect wall etc. department, adopt the roller brush to carry out waterproof under coat construction to large tracts of land department. The waterproof bottom coat is constructed by roller coating and brush coating, and the bottom surface is not exposed and not accumulated.

The waterproof base coat 2 is formed by reacting and curing a two-component polyurethane base coat at normal temperature, the coating weight is not less than 0.4kg per square meter, and the surface drying time is preferably 60 to 90min. The polyurethane primer is preferably aliphatic isocyanate, and has good weather resistance, small component and strong permeability. The two-component polyurethane primer is gently and uniformly stirred with the two-component raw materials before use, is accurately weighed and prepared according to the proportion strictly required by a product use specification, and is used after being prepared. And after weighing is finished, fully stirring to be uniform, preferably performing bubble breaking treatment on the uniformly stirred and mixed base paint in a vacuum bubble breaking mode, and then performing roller coating and brush coating construction.

And standing for enough time after the construction of the waterproof bottom coating 2 is finished, and performing waterproof surface coating construction after the surface of the bottom coating is confirmed to be dry. The brush is preferably used for waterproof surface coating construction of bridge floor water outlets, corners, vertical walls and the like, and the roller brush is used for waterproof surface coating construction of large areas. The waterproof surface coating is applied by roller coating and brush coating, and the coating is not required to flow, expose the bottom, scratch and crack, and peel and bulge.

The waterproof surface coating 3 is formed by reacting and curing a high-performance aliphatic polyurethane surface coating at normal temperature, the coating weight is not less than 0.8kg per square meter, and the surface drying time is preferably 90 to 120min. The surface coating is preferably a high-performance aliphatic polyurethane surface coating which has tensile strength not less than 10MPa and elongation at break not less than 300 percent, is cured to form a waterproof surface coating, and has the high physical mechanical property of a waterproof layer in a traditional waterproof system and the high weather resistance and aging resistance of the surface coating.

The treatment construction of the concrete base layer of the bridge deck is preferably completed in one or more window periods, the construction of the waterproof bottom coating and the waterproof surface coating is preferably completed in the same window period, and the influence of dust brought by the running of a train during the construction of the waterproof layer in a multi-window period, rainwater, condensation and other environmental factors on the construction quality of the waterproof layer after every other day can be effectively avoided. After the waterproof surface coating 3 is constructed and before the train runs to a repair construction position, enough time is reserved, and the influence of dust and impurities brought by the running of the train on a waterproof system is reduced after the surface of the waterproof surface coating is dried.

The two-component polyurethane primer and the high-performance aliphatic polyurethane top coat related in the invention are widely applied to different construction processes and other anticorrosion fields, but the two materials are combined together to be used as a ballastless bridge deck repairing waterproof layer, and are still completed for the first time and applied in a bridge deck repairing test section, so that the effect is good.

Compared with the prior art, the invention has the following advantages:

(1) The traditional waterproof layer and the surface coating are combined into a whole, the waterproof coating has the high physical mechanical property of the traditional waterproof layer and the high weather resistance and aging resistance of the surface coating, and meets the requirements of the national standard or technical conditions for waterproofing of the concrete bridge floor of the ballastless track railway.

(2) The structure is simplified, no redundancy design is adopted, the construction procedures are reduced, the construction is more convenient, the construction efficiency is higher, and the method is particularly suitable for maintenance and construction in the window period of the operation railway.

(3) The waterproof bottom coating and the waterproof surface coating can be constructed in one window period, the influence of dust, rainwater, condensation and other environmental factors brought by the running of the train on the construction quality of the waterproof layer during multi-window period construction is avoided, the fault tolerance rate is higher, and the construction quality is more stable.

(4) The construction does not need large-scale equipment, uses traditional small-size instrument to accomplish, satisfies the bridge floor and restores the unable condition of carrying large-scale equipment instrument.

(5) The waterproof priming paint adopts aliphatic isocyanate, has good weather resistance and small component, has stronger permeability to cement base materials compared with the traditional priming paint, can greatly improve the bonding strength of the waterproof material and a concrete base surface, and prolongs the service life.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides a ballastless track railway bridge floor waterproof layer restores and uses waterproof system structure which characterized in that it includes bridge floor concrete-based layer (1), sets up waterproof under coat (2) and the waterproof surface coating (3) of coating on waterproof under coat (2) above bridge floor concrete-based layer (1), waterproof under coat (2) are two ingredient polyurethane coating, and waterproof surface coating (3) are aliphatic polyurethane coating.

2. The waterproof system structure for repairing the ballastless track railway bridge floor waterproof layer according to claim 1, wherein the coating quantity of the waterproof bottom coating (2) is greater than or equal to 0.4kg per square meter.

3. The waterproof system structure for repairing the ballastless track railway bridge floor waterproof layer according to claim 1, wherein the coating amount of the waterproof top coating (3) is more than or equal to 0.8kg per square meter, and the dry film thickness is not more than 0.6mm.

4. The waterproof system structure for repairing the ballastless track railway deck waterproof layer according to claim 1, characterized by further comprising an original waterproof layer (5), wherein a groove (4) is formed on the original waterproof layer (5) after a defect of the original waterproof layer (5) is removed, and the edge of the waterproof bottom coating (2) is lapped on the groove (4).

5. The waterproof system structure for repairing the ballastless track railway deck waterproof layer according to claim 1, wherein one end of the bridge deck concrete base layer (1) is provided with an anti-collision wall or a water retaining platform (7), and the waterproof bottom coating (2) is coated on the anti-collision wall or the water retaining platform (7) and has a height of 5-15cm.

6. The waterproof system structure for repairing the ballastless track railway bridge floor waterproof layer according to claim 1, wherein a rainwater pipe (8) is arranged on the bridge deck concrete base layer (1), and the waterproof bottom coating (2) is excessively coated on the inner wall of the rainwater pipe (8) from the bridge deck concrete base layer (1) and extends into the rainwater pipe (8) by 3-7cm.

7. A construction method of a waterproof system for repairing a ballastless track railway bridge floor waterproof layer is characterized by comprising the following steps:

cleaning a residual original waterproof layer (5) on the bridge deck concrete base layer (1);

coating a two-component polyurethane primer on the bridge deck concrete base layer (1) to serve as a waterproof primer layer (2);

and (3) coating an aliphatic polyurethane surface coating on the surface-dried waterproof bottom coating (2) to form a waterproof surface coating (3).

8. The method for constructing the waterproof system for repairing the bridge floor waterproof layer of the ballastless track railway according to claim 7, wherein when the residual original waterproof layer (5) is cleaned, a percussion drill with a flat shovel head is adopted for cleaning, the inclination angle between the flat shovel head and the bridge floor is less than or equal to 15 degrees during the removal, after the cleaning is finished, a disc grinder is used for cleaning the surface of the bridge floor concrete base layer, so that scum, floating soil, hollowing, loosening and honeycomb pitted surface on the surface of the bridge floor concrete base layer are cleaned, and a clean and compact concrete base layer is exposed.

9. The construction method of the waterproof system for repairing the ballastless track railway bridge floor waterproof layer according to claim 7, wherein the waterproof priming coat (2) is formed by normal-temperature reaction and curing, the coating amount is more than or equal to 0.4kg per square meter, and the surface drying time is 60 to 90min;

the waterproof surface coating (3) is formed by normal temperature reaction and curing, the coating weight is more than or equal to 0.8kg per square meter, and the surface drying time is 90 to 120min.

10. The construction method of the waterproof system for repairing the ballastless track railway deck waterproof layer according to claim 7, wherein the construction of the waterproof bottom coating (2) and the waterproof top coating (3) is completed in the same window period.

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