Parapet wall bottom waterproof structure with handrails at top and construction method of parapet wall bottom waterproof structure

Abstract

The invention discloses a parapet wall bottom waterproof structure with handrails at the top and a construction method thereof, the parapet wall bottom waterproof structure comprises an embedded steel plate embedded in the inner side surface of a parapet wall, the embedded steel plate is provided with the handrails, and the bottom of the embedded steel plate integrally extends downwards and outwards to form a flashing plate; the mortar layer is laid on a roof floor slab and is turned upwards to the inner side of the flashing plate along the inner side face of the parapet wall, and the outer side face of the mortar layer at the junction of the parapet wall and the roof floor slab is in a circular arc shape; the waterproof layer is arranged in the mortar layer and the upturning section of the mortar layer, and the upper end of the waterproof layer is arranged on the inner side face of the parapet wall in a closing-up mode. The problem that the corner of an existing parapet wall and a roof floor slab is prone to cracking and water seepage is solved.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a waterproof structure at the bottom of a parapet wall with railings on top and its construction method. Background Technology

[0002] As the perimeter enclosure of a building's roof, the parapet wall serves a dual function: providing safety protection and completing the roof's waterproofing. When railings are installed at the top of the parapet wall, its bottom waterproofing structure must simultaneously address the impact of rainwater drainage from the roof, structural joint sealing, and the additional stress from the railing load, making it a critical weak point in building waterproofing design. In existing technologies, the waterproofing layer at the corner where the parapet wall meets the roof slab is prone to cracking due to stress concentration, especially near the railing fixing points. If the bolt holes are not properly sealed, rainwater can easily seep into the structural layer along the gaps. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a waterproof structure for the bottom of a parapet wall with railings at the top and its construction method are provided to solve the problem of easy cracking and water seepage at the corner of the existing parapet wall and the roof slab.

[0004] To achieve the above objectives, a waterproof structure for the bottom of a parapet wall with a railing at the top is provided, comprising: An embedded steel plate is embedded in the inner side of the parapet wall. The embedded steel plate is equipped with railings, and the bottom of the embedded steel plate extends downward and outward to form a flashing. A mortar layer is laid on the roof floor slab and extends up along the inner side of the parapet wall to the inner side of the flashing. The outer side of the mortar layer at the junction of the parapet wall and the roof floor slab is arc-shaped. A waterproof layer is provided within the mortar layer and the upturned section of the mortar layer, and the upper end of the waterproof layer is installed on the inner side of the parapet wall.

[0005] Furthermore, the embedded steel plate is connected to anchor bars, which are embedded in the parapet wall.

[0006] Furthermore, the railing is installed on the embedded steel plate by bolts.

[0007] Furthermore, the embedded steel plate and the parapet wall are provided with bolt holes, the bolt holes are filled with elastomeric sealant, and the bolts are inserted into the bolt holes.

[0008] Furthermore, a receiving groove is formed on the inner side of the parapet wall. The receiving groove is located below the embedded steel plate and is arranged along the length of the parapet wall. The upper end of the waterproof layer is laid in the receiving groove. A pressure plate is fixed in the receiving groove and presses against the upper end of the waterproof layer.

[0009] Furthermore, the space between the pressure plate and the receiving groove is filled with sealant.

[0010] Furthermore, it also includes an additional waterproof layer, which is laid at the location corresponding to the junction of the waterproof layer.

[0011] This invention provides a construction method for a waterproof structure at the bottom of a parapet wall with a railing at the top, comprising the following steps: A parapet wall is poured on the roof floor slab, and a pre-embedded steel plate is embedded in the inner side of the parapet wall. The flashing at the bottom of the pre-embedded steel plate extends downward and outward from the inner side of the parapet wall. A mortar layer is laid on the roof floor slab. The mortar layer extends up the inner side of the parapet wall to the inner side of the flashing. The outer side of the mortar layer at the junction of the parapet wall and the roof floor slab is arc-shaped. When laying the mortar layer, a waterproof layer is placed inside the mortar layer and the upturned section of the mortar layer. The upper end of the waterproof layer is installed on the inner side of the parapet wall. A railing is installed on the pre-embedded steel plate.

[0012] The beneficial effects of this invention are as follows: the waterproof structure at the bottom of the parapet wall with a top railing integrates the embedded steel plate, flashing, and railing into a unified waterproof and reinforced design; the mortar layer uses an arc-shaped transition at the junction of the parapet wall and the roof slab to eliminate stress and reduce the risk of mortar layer cracking; and the upper end of the waterproof layer is covered by a waterproof board to reduce the risk of water seepage. This invention's waterproof structure at the bottom of the parapet wall with a top railing, through systematic node reinforcement and material synergy, breaks through the technical bottlenecks of traditional parapet wall bottom waterproofing, especially in dealing with the load of the top railing, complex environments, and construction efficiency, providing an innovative solution for the field of building waterproofing. Attached Figure Description

[0013] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the waterproof structure at the bottom of the parapet wall with a railing at the top, according to an embodiment of the present invention.

[0014] Figure label: Embedded steel plate 1, flashing 11; Mortar layer 2, upturned section 21; Waterproof layer 3; Parapet wall 4, receiving groove 40; 5 railings, 51 bolts; Additional waterproof layer 6; 7. Roof floor slab. Detailed Implementation

[0015] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] Reference Figure 1 As shown, the present invention provides a waterproof structure for the bottom of a parapet wall with a railing at the top, comprising: a pre-embedded steel plate 1, a mortar layer 2, and a waterproof layer 3.

[0018] The embedded steel plate 1 is a hot-dip galvanized steel plate. The embedded steel plate 1 is embedded on the inner side of the parapet wall 4. The embedded steel plate is elongated and runs the entire length of the parapet wall.

[0019] The embedded steel plate 1 is fitted with railings 5. The bottom of the embedded steel plate 1 extends downward and outward in one piece to form a flashing 11.

[0020] In this embodiment, the embedded steel plate, flashing, and railing are integrated into a waterproof and reinforced design. A continuous hot-dip galvanized steel plate 1 is embedded in the parapet wall.

[0021] In a preferred embodiment, the embedded steel plate 1 is connected to anchor bars. The anchor bars are embedded within the parapet wall 4. The railing 5 is installed on the embedded steel plate 1 using bolts 51.

[0022] The anchor bars are poured simultaneously with the wall concrete, and hot-dip galvanized flashing steel plates are welded to form the railing fixing base. The surface of the steel plate is coated with a primer to ensure a tight bond with the waterproof layer.

[0023] Mortar layer 2 is laid on the roof slab 7. When mortar layer 2 reaches the base of the parapet wall, it extends up along the inner side of the parapet wall 4 to the inner side of the flashing 11, which is the upturned section of the mortar layer. The outer side of the mortar layer 2 at the junction of the parapet wall 4 and the roof slab 7 is arc-shaped.

[0024] In this embodiment, the junction of the roof slab and the parapet wall is leveled with 20mm thick 1:2.5 polymer cement mortar, and the inside and outside corners are rounded with R≥50mm to eliminate stress concentration points.

[0025] Waterproof layer 3 is installed within mortar layer 2 and the upturned section 21 of mortar layer 2. The upper end of waterproof layer 3 is installed on the inner side of parapet wall 4.

[0026] In this embodiment, the mortar layer includes a slope-finding layer, a leveling layer, and a protective layer, laid sequentially from bottom to top on the roof slab. The waterproof layer is laid between the leveling layer and the protective layer.

[0027] The slope-finding layer is made of 30mm thick lightweight aggregate concrete.

[0028] The leveling layer is made of 20mm thick 1:2.5 polymer cement mortar.

[0029] The waterproof membrane is a 3mm thick SBS modified bitumen waterproof membrane.

[0030] The protective layer is a 20mm thick polymer cement mortar layer with an embedded hot-dip galvanized steel wire mesh for crack prevention. The mesh size of the crack prevention mesh is 10mm × 10mm.

[0031] Bolt holes are provided in the embedded steel plate 1 and the parapet wall 4. Elastomer sealant is injected into the bolt holes. Bolts 51 are inserted into the bolt holes. The displacement capacity of the elasomer sealant is ±25%. The filling depth of the elasomer sealant is ≥2 / 3 of the hole depth, blocking the seepage channel.

[0032] The waterproof structure at the bottom of the parapet wall with railings at the top of the present invention also includes an additional waterproof layer 6. The additional waterproof layer 6 is laid at the corresponding junction of the waterproof layer 3.

[0033] In this embodiment, the waterproof layer is a 3mm thick SBS modified bitumen waterproof membrane (polyester-based), extending from the roof to a height of 300mm inside the parapet wall, forming a continuous flashing structure. The main waterproof layer covers the additional waterproof layer, forming a double protection of "additional layer + main layer".

[0034] The additional waterproofing layer uses 3mm thick SBS modified bitumen waterproofing membrane (the same material as the main waterproofing layer), and the width of the additional layer is 500mm (250mm on each side).

[0035] In a preferred embodiment, a receiving groove 40 is formed on the inner side of the parapet wall 4. The receiving groove 40 is located below the embedded steel plate 1. The receiving groove 40 is arranged along the length of the parapet wall 4. The upper end of the waterproof layer 3 is laid in the receiving groove 40. A pressure plate is fixed in the receiving groove 40. The pressure plate presses against the upper end of the waterproof layer 3.

[0036] In this embodiment, sealant is used to fill the space between the pressure plate and the receiving groove 40.

[0037] A receiving groove is made on the inner side of the parapet wall. After the waterproof layer is embedded into the receiving groove, it is fixed with an aluminum alloy pressure plate. The ends of the pressure plate and the gaps in the receiving groove are sealed with sealant, and a 20mm thick polymer cement mortar protective layer is applied to the outside, with a hot-dip galvanized steel wire mesh for crack prevention built in.

[0038] This invention provides a construction method for a waterproof structure at the bottom of a parapet wall with a railing at the top, comprising the following steps: S1. Cast the parapet wall 4 on the roof floor slab 7. At the same time, embed the pre-embedded steel plate 1 on the inner side of the parapet wall 4. The flashing plate 11 at the bottom of the pre-embedded steel plate 1 extends downward and outward from the inner side of the parapet wall 4.

[0039] S2. Lay mortar layer 2 on the roof floor slab 7. The mortar layer 2 is turned up along the inner side of the parapet wall 4 to the inner side of the flashing 11. The outer side of the mortar layer 2 at the junction of the parapet wall 4 and the roof floor slab 7 is arc-shaped. When laying the mortar layer 2, the waterproof layer 3 is set in the mortar layer 2 and the upturned section 21 of the mortar layer 2. The upper end of the waterproof layer 3 is installed on the inner side of the parapet wall 4.

[0040] When laying the mortar layer, the slope-finding layer, leveling layer and protective layer are laid in sequence from bottom to top on the roof floor.

[0041] Before laying the protective layer, lay the waterproof layer on the leveling layer. An additional waterproof layer is then laid at the junction of the parapet wall and the roof slab corresponding to the original waterproof layer.

[0042] At the junction of the roof slab and the parapet wall, a 20mm thick 1:2.5 polymer cement mortar is used for leveling, and the inside and outside corners are rounded with a radius of ≥50mm to eliminate stress concentration points.

[0043] S3. A railing 5 is installed on the pre-embedded steel plate 1.

[0044] The railings are connected to the pre-embedded steel plates using expansion bolts.

[0045] The waterproof structure at the bottom of the parapet wall with a top railing of this invention integrates the embedded steel plate, flashing, and railing into a single waterproof and reinforced design. Through systematic node reinforcement and material synergy, this waterproof structure at the bottom of the parapet wall overcomes the technical bottlenecks of traditional parapet wall waterproofing, exhibiting significant advantages, particularly in handling the load of the top railing, complex environments, and construction efficiency, providing an innovative solution for the field of building waterproofing.

[0046] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A waterproof structure for the bottom of a parapet wall with a railing at the top, characterized in that, include: An embedded steel plate is embedded in the inner side of the parapet wall. The embedded steel plate is equipped with railings, and the bottom of the embedded steel plate extends downward and outward to form a flashing. A mortar layer is laid on the roof floor slab and extends up along the inner side of the parapet wall to the inner side of the flashing. The outer side of the mortar layer at the junction of the parapet wall and the roof floor slab is arc-shaped. A waterproof layer is provided within the mortar layer and the upturned section of the mortar layer, and the upper end of the waterproof layer is installed on the inner side of the parapet wall.

2. The waterproof structure at the bottom of the parapet wall with railings at the top as described in claim 1, characterized in that, The embedded steel plate is connected to anchor bars, which are embedded in the parapet wall.

3. The waterproof structure at the bottom of the parapet wall with a railing at the top as described in claim 2, characterized in that, The railing is installed on the embedded steel plate by bolts.

4. The waterproof structure at the bottom of the parapet wall with railings at the top as described in claim 3, characterized in that, The embedded steel plate and the parapet wall are provided with bolt holes, and the bolt holes are filled with elastomeric sealant. The bolts are inserted into the bolt holes.

5. The waterproof structure at the bottom of the parapet wall with a railing at the top as described in claim 1, characterized in that, The inner side of the parapet wall has a receiving groove, which is located below the embedded steel plate and is arranged along the length of the parapet wall. The upper end of the waterproof layer is laid in the receiving groove, and a pressure plate is fixed in the receiving groove, which presses against the upper end of the waterproof layer.

6. The waterproof structure at the bottom of the parapet wall with a railing at the top as described in claim 5, characterized in that, The space between the pressure plate and the receiving groove is filled with sealant.

7. The waterproof structure at the bottom of the parapet wall with a railing at the top as described in claim 1, characterized in that, It also includes an additional waterproof layer, which is laid at the location corresponding to the junction of the waterproof layer.

8. A construction method for a waterproof structure at the bottom of a parapet wall with railings at the top, as described in any one of claims 1 to 7, characterized in that, Includes the following steps: A parapet wall is poured on the roof floor slab, and a pre-embedded steel plate is embedded in the inner side of the parapet wall. The flashing at the bottom of the pre-embedded steel plate extends downward and outward from the inner side of the parapet wall. A mortar layer is laid on the roof floor slab. The mortar layer extends up the inner side of the parapet wall to the inner side of the flashing. The outer side of the mortar layer at the junction of the parapet wall and the roof floor slab is arc-shaped. When laying the mortar layer, a waterproof layer is placed inside the mortar layer and the upturned section of the mortar layer. The upper end of the waterproof layer is installed on the inner side of the parapet wall. A railing is installed on the pre-embedded steel plate.

Images