CN112726390A

CN112726390A - Waterproof method of bridge support and polyurethane sealing waterproof structure

Info

Publication number: CN112726390A
Application number: CN202110085367.8A
Authority: CN
Inventors: 冷新云; 夏俊勇; 王鹏; 庾光忠; 刘军; 言建波; 田杨; 李培璐
Original assignee: Zhuzhou Times New Material Technology Co Ltd
Current assignee: Zhuzhou Times New Material Technology Co Ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-04-30

Abstract

A polyurethane material is poured on the periphery of a support body to form an elastomer isolation layer which is hermetically combined with the bottom surface of a beam body and the top surface of a pier, a sealed cavity is formed between the support body and the elastomer isolation layer, and water is blocked outside the sealed cavity through the elastomer isolation layer. The thickness of the polyurethane sealing waterproof structure adopted by the invention can be set according to the use requirement, the upper end and the lower end of the polyurethane sealing waterproof structure are respectively and tightly combined with the bottom surface of the bridge and the top surface of the pier, and no gap exists in the middle of the polyurethane sealing waterproof structure, so that the elastomer isolation layer can be ensured to be completely waterproof, and the whole support can not be corroded by water even if the whole support is completely below the water level.

Description

Waterproof method of bridge support and polyurethane sealing waterproof structure

Technical Field

The invention relates to a waterproof method and a waterproof structure of a bridge bearing, in particular to a waterproof method and a polyurethane sealing waterproof structure of a bridge bearing.

Background

The bridge support is an important structural member for connecting an upper structure and a lower structure of a bridge, providing bearing, displacement and rotation, is an important component of the bridge, and generally requires the same service life of the support and the bridge. In some bridges, due to condition limitation, the bridges cannot be designed too high, so that in flood season, bridges in many cities are basically level to the water surface, the support is often soaked in water, and the service life of the support is seriously influenced because the traditional support does not have a waterproof function. Some bridges such as application No. CN201810013450.2, named as bridge support protective devices, adopt a mode of adding a protective sleeve and a sealant outside a support to achieve water resistance, and the mode of using the sealant in a large range cannot meet the requirement of long-term effective sealing.

As another scheme: application number CN201020301693.5, the name is "a bridge beam supports with buckler" utility model adopts the regional sealed waterproof mesh that reaches between upper bracket board and the bottom suspension board of buckler that side bounding wall, end bounding wall and elastic rubber board are constituteed.

Scheme II: application number CN201420106805.X, the name is "a waterproof spherical bearing" utility model discloses a set up waterproof sealing skirt between last bedplate and lower bedplate, and waterproof sealing skirt go up along fixing on the perisporium of last bedplate through stainless steel layering and stainless steel screw, down along reaching waterproof purpose through the mode of hoop, shrink taut rope or strip magnet etc. mode fixed on the wall all around of bedplate down.

The third scheme is as follows: application number CN201920809645.8, the utility model discloses a be provided with division board and rubber seal piece between support and base that the name is "the antiseep structure of road and bridge worker shape support", and set up waterproof stripe in division board top and bottom, form a closed toroidal cavity and carry out waterproofly.

In the first scheme, one end of each side wall plate, one end of each end wall plate and the rubber elastic plate are fixed, the other end of each side wall plate is in a suspended state, the binding force of the fixed ends can be weakened under the action of gravity, in addition, how to completely seal all the joints is not mentioned in the scheme, and the firmness degree of the scheme is doubtful. In the second scheme, the waterproof sealing skirt can only adopt a thinner and softer structure to realize the fixing mode, the fixing modes of the upper edge and the lower edge cannot realize complete sealing, and when the support is soaked in water, water cannot be completely blocked from flowing into the waterproof sealing skirt. In the third scheme, the sealing performance of the waterproof rubber strip and the rubber sealing block at the gap cannot be fully ensured, and the more the joint parts are, the more difficult the sealing is. Therefore, the above solutions are not suitable for waterproofing bridge bearings which are immersed in water for a long time, and need to be improved.

Disclosure of Invention

The invention provides a waterproof method of a bridge support and a polyurethane sealing waterproof structure aiming at the problem that the current bridge support cannot meet the waterproof requirement of the support when being soaked in water for a long time.

The technical means adopted by the invention to solve the problems are as follows: a waterproof method for a bridge support comprises the steps of pouring polyurethane materials on the periphery of a support body to form an elastomer isolation layer which is hermetically combined with the bottom surface of a beam body and the top surface of a pier, forming a sealed cavity between the support body and the elastomer isolation layer, and blocking water outside the sealed cavity through the elastomer isolation layer.

Further, before the polyurethane material is poured, an inner sealing coaming is arranged on the periphery of the support body, an outer die with two ends respectively connected to the bottom surface of the beam body and the top surface of the pier in a sealing mode is arranged on the periphery of the inner sealing coaming, a pouring hole is formed in the outer die, the polyurethane material is poured into a space defined by the inner sealing coaming and the outer die from the pouring hole, and the outer die is detached after the polyurethane material is dried.

Furthermore, the inner sealing coaming is made of low-density rubber coaming, and the elongation at break of the inner sealing coaming is not less than 500%.

Further, before the outer die is arranged, the bottom surface of the beam body and the top surface of the pier, which surround the inner sealing coaming and the outer die, are cleaned and polished to form a flat, clean and dry base surface, and waterproof paint is coated on the base surface.

Further, the moisture content of the surface of the base layer is not more than 20%.

Further, the waterproof coating is mechanically stirred and mixed for 2-3min before being coated, and the thickness of the coating is more than 0.2 mm.

Furthermore, the polyurethane material is prepared by mixing waterproof material A and waterproof material B, and the elongation at break of the polyurethane material is more than 900%.

Further, the weight error of the material A and the material B is not more than 1 percent of the product specification.

Further, the material A and the material B are respectively subjected to vacuum defoamation with the vacuum degree of not less than 0.095MPa before mixing.

The utility model provides a polyurethane sealing waterproof structure of bridge beam supports, includes that both ends that form are connected to roof beam body bottom surface and pier top surface respectively, the polyurethane elastomer isolation layer sealed at the peripheral pouring of support body.

Furthermore, an inner sealing coaming is combined at the inner layer of the elastomer isolation layer close to the side of the support body, and waterproof paint is arranged at the two ends of the elastomer isolation layer close to the bottom surface of the beam body and the top surface of the pier.

The invention has the beneficial effects that:

1. the polyurethane sealing waterproof structure adopted by the invention is not limited by the shape of the bridge bearing and does not influence the performance of the bearing, so that the polyurethane sealing waterproof structure is suitable for waterproof protection of various bridge bearings.

2. The thickness of the polyurethane sealing waterproof structure adopted by the invention can be set according to the use requirement, the upper end and the lower end of the polyurethane sealing waterproof structure are respectively and tightly combined with the bottom surface of the bridge and the top surface of the pier, and no gap exists in the middle of the polyurethane sealing waterproof structure, so that the elastomer isolation layer can be ensured to be completely waterproof, and the whole support can not be corroded by water even if the whole support is completely below the water level.

3. The elastomer isolation layer has the advantages of long service life, good sealing effect and simple structure, and can effectively prolong the service life of a product and ensure the same service life of a support and a bridge.

4. The lower end of the elastomer isolation layer is supported on the surface of a pier, the elastic deformation of the material is large, and the elastomer sealing layer deforms along with the beam body under the condition that the support slides in a large displacement mode and cannot be damaged.

Drawings

FIG. 1 is a front view of a polyurethane sealing and waterproofing structure according to an embodiment;

FIG. 2 is a top view of a polyurethane waterproof seal structure according to an embodiment;

FIG. 3 is a schematic view illustrating the bonding of a bridge bearer to an inner sealing fence according to an embodiment;

in the figure: 1. the bearing comprises a bearing body, 11 parts of an upper bearing plate, 12 parts of a lower bearing plate, 2 parts of an inner sealing coaming, 3 parts of an elastomer isolation layer, 4 parts of an outer die, 5 parts of waterproof paint, 6 parts of waterproof bonding glue, 7 parts of a pouring hole, 8 parts of a beam body, 9 parts of a pier and 10 parts of a guide pipe.

Detailed Description

The invention is further described below with reference to the accompanying drawings. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example one

The utility model provides a sealed waterproof construction of polyurethane of bridge beam supports, include the sealed interior sealed bounding wall 2 and the elastomer isolation layer 3 that surrounds of support main part 1 with the bridge, wherein interior sealed bounding wall 2 is located the inboard department that is close to support main part 1, elastomer isolation layer 3 is located the outside department of keeping away from support main part 1, interior sealed bounding wall 2 and the laminating of elastomer isolation layer 3 become a whole, and the both ends of elastomer isolation layer 3 are sealing connection respectively to 8 bottom surfaces of the roof beam body and 9 top surfaces of pier, adopt the mode of polyurethane material cast in situ to form.

The embodiment also relates to a waterproof method of the bridge bearing, wherein waterproof bonding glue 6 is bonded on the outer peripheries of the upper support plate 11 and the lower support plate 12 of the bridge bearing body 1, and then an inner sealing coaming 2 is bonded on the waterproof bonding glue 6, wherein the inner sealing coaming 2 needs to be firmly sealed after being bonded on the outer sides of the upper support plate 11 and the lower support plate 12, so that liquid is prevented from flowing in, and in the subsequent pouring process of polyurethane materials, the inner sealing coaming 2 does not sink, leak liquid and deform. The inner sealing coaming 2 is a low-hardness rubber coaming, the thickness is 2mm, the elastic deformation of the rubber is large, and the elongation at break is not less than 500%. Of course, the inner sealing surrounding plate 2 can also be fixed with the support in other modes, such as magic tape.

After the inner sealing coaming 2 is installed, dirt such as oil stain and release agent on the concrete surface of the bottom surface of the beam body and the top surface of the pier around the support body 1 is removed by a physical method, and scum, floating soil, hollowing, loosening and honeycomb rough surface on the surface are polished until the fresh concrete substrate surface is exposed. The surface of the treated concrete substrate should be smooth, clean and dry, and dirt such as hollowing, loosening, honeycomb pitted surface, scum, floating soil, a release agent, oil stain and the like cannot be generated. And measuring the moisture of the ground concrete area by using a concrete moisture meter, wherein the moisture content of all measuring points is required to be not more than 20%, and if the moisture content is not required to be not more than 20%, measures such as air blowing and airing are adopted for processing until the moisture content meets the requirements.

And (2) painting the waterproof paint 5 on the ground surface area of the base layer, and mechanically stirring and mixing the waterproof paint 5 for 2-3min before painting, wherein in the painting process, the waterproof paint 5 is guaranteed to be evenly painted on the surface of the base layer, the bottom surface is not exposed, and the waterproof paint is not accumulated, the thickness of the coating is more than 0.2mm, and the using amount of the waterproof paint 5 per square meter is more than 0.4 kg.

And after the waterproof coating 5 is dried, supporting a mold by an outer mold 4, wherein the outer mold 4 is positioned at the periphery of the inner sealing coaming 2, two ends of the outer mold 4 are respectively connected with an upper support plate 11 and a lower support plate 12 in a sealing manner, and the bottom surface of the beam body 8 and the top surface of the pier 9, which are surrounded by the inner sealing coaming 2 and the outer mold 4, are both polished areas coated with the waterproof coating 5. The outer die 4 is provided with a pouring hole 7, the pouring hole 7 is preferably arranged at the topmost end of the outer die 4, a guide pipe 10 is connected to the pouring hole 7, and the polyurethane material is poured into a space enclosed by the outer die 4 and the inner sealing surrounding plate 2 from the pouring hole 7 by the guide pipe 10. The outer mold 4 is required to be measured by a leveling rod when being installed, the outer mold 4 is guaranteed to be wholly horizontal after the installation is completed, so that liquid leakage, liquid leakage and deformation at joints are avoided in the pouring process of the polyurethane material, and the molded surface of the elastomer isolation layer 3 after the pouring is smooth.

The polyurethane material is formed by mixing waterproof A material and waterproof B material, the elastic modulus is required to be low, the deformation is large, the elongation at break is larger than 900%, the polyurethane material is mixed on site through a casting machine, is solidified after casting to form an elastomer isolating layer 3, and is firmly adhered with a waterproof coating 5 coated on the surface of a base layer in advance, so that the whole support is sealed, and the waterproof purpose is achieved. The components of the material A and the material B of the polyurethane material are prepared strictly according to the product specification, the flow rates of the components of the material A and the material B are calibrated before the preparation, and the weighing error of each component is not more than 1%. After weighing, respectively adding the material A and the material B into a charging bucket of a casting machine, and respectively carrying out vacuum defoaming before mixing at a vacuum degree of not less than 0.095 MPa. The amount of the catalyst is adjusted through a field sample test according to the construction environment before pouring, so that the operable time and the surface drying time of the elastomer material are ensured to be suitable for the field requirement. And (4) pouring by adopting a manual or mechanical method according to construction conditions.

And (5) after the surface of the polyurethane material is dried, removing the external mold 4 to complete the construction of the polyurethane sealing waterproof structure.

Example two

In this embodiment, the waterproof adhesive 6 is adhered to the bottom surface of the beam 8 and the top surface of the pier 9, so that the two ends of the inner sealing coaming 2 are respectively combined with the bottom surface of the beam 8 and the top surface of the pier 9 in a sealing manner, at this time, in the pouring process of the polyurethane material, the inner sealing coaming 2 is not subjected to lateral supporting force, and the inner sealing coaming 2 can be fixed by screwing bolts on the bottom surface of the beam 8 to keep the stability in the radial direction.

The above embodiments are provided for illustrative purposes only and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should fall within the scope of the present invention, and the scope of the present invention should be defined by the claims.

Claims

1. A waterproof method of a bridge bearing is characterized by comprising the following steps: the method is characterized in that polyurethane material is poured on the periphery of a support body (1) to form an elastomer isolation layer (3) which is hermetically combined with the bottom surface of a beam body (8) and the top surface of a pier (9), a sealed cavity is formed between the support body (1) and the elastomer isolation layer (3), and water is blocked outside the sealed cavity through the elastomer isolation layer (3).

2. The method of waterproofing a bridge deck according to claim 1, wherein: before the polyurethane material is poured, an inner sealing coaming (2) is arranged on the periphery of a support body (1), an outer mold (4) with two ends respectively connected to the bottom surface of a beam body (8) and the top surface of a pier (9) in a sealing mode is arranged on the periphery of the inner sealing coaming (2), a pouring hole (7) is formed in the outer mold (4), the polyurethane material is poured into a space enclosed by the inner sealing coaming (2) and the outer mold (4) from the pouring hole (7), and the outer mold (4) is detached after the polyurethane material is dried.

3. The method of waterproofing a bridge deck according to claim 2, wherein: the inner sealing coaming (2) adopts a low-density rubber coaming, and the elongation at break of the inner sealing coaming is not less than 500 percent.

4. The method of waterproofing a bridge deck according to claim 2, wherein: before the outer die (4) is arranged, the bottom surfaces of the beam body (8) and the top surface of the pier (9) which are enclosed in the inner sealing coaming (2) and the outer die (4) are cleaned and polished to form a flat, clean and dry base surface, and waterproof paint (5) is coated on the base surface.

5. The method of waterproofing a bridge deck according to claim 4, wherein: the moisture content of the surface of the base layer is not more than 20%.

6. The method of waterproofing a bridge deck according to claim 4, wherein: the waterproof coating (5) is mechanically stirred and mixed for 2-3min before being coated, and the thickness of the coating is more than 0.2 mm.

7. The method of waterproofing a bridge deck according to claim 1, wherein: the polyurethane material is prepared by mixing waterproof A material and waterproof B material, and the elongation at break of the polyurethane material is more than 900 percent.

8. The method of waterproofing a bridge deck according to claim 7, wherein: and respectively carrying out vacuum defoaming on the material A and the material B before mixing at a vacuum degree of not less than 0.095 MPa.

9. The utility model provides a polyurethane sealing waterproof structure of bridge beam supports which characterized in that: comprises a sealed polyurethane elastomer isolation layer (3) which is poured on the periphery of a support body (1) and has two ends respectively connected to the bottom surface of a beam body (8) and the top surface of a pier (9).

10. The polyurethane sealing and waterproofing structure of a bridge bearer according to claim 9, wherein: the elastomer isolation layer (3) is combined with an inner sealing coaming (2) at the inner layer close to the side of the support body (1), and waterproof coatings (5) are arranged at two ends close to the bottom surface of the beam body (8) and the top surface of the pier (9).