既有建筑物与新建构筑物的结构交接处柔性防水节点
By setting up a flexible waterproof joint with a multi-layered colloidal structure and repeatable grouting pipe at the junction of a new structure and an existing building, the problem of weak points in waterproofing is solved, achieving a highly efficient waterproofing effect and corrosion resistance. It is suitable for the junction of new structures and existing buildings in construction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU MUNICIPAL ENG MASCH CO
- Filing Date
- 2025-06-17
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies for waterproofing structures at the junction of new and existing buildings are susceptible to the effects of concrete shrinkage, temperature changes, and uneven settlement, resulting in poor waterproofing performance. In particular, flexible waterproofing materials are prone to aging and corrosion at vertical construction joints, creating weak points in the waterproofing.
Flexible waterproof joints are installed at the structural junctions of existing buildings and new structures. These joints include a primary waterproof layer, a binding structure, backfill concrete, a secondary waterproof layer, and repeatable grouting pipes. A multi-layered colloidal structure is formed by combining EVA waterproofing membrane, geotextile, polyurethane sealant, and waterproofing agent. Combined with repeatable grouting pipes, multiple lines of defense are provided to ensure waterproofing effectiveness.
It improves the waterproof performance at structural junctions, resists the effects of thermal expansion and contraction and uneven settlement, provides multi-layer waterproof protection to ensure no groundwater leakage, has good corrosion resistance and aging resistance, and is capable of repeated reinforcement.
Smart Images
Figure CN224514806U_ABST
Abstract
Claims
1. A flexible waterproof joint at the structural junction of an existing building and a newly constructed structure, located between the existing structural column, the base course, and the newly constructed foundation slab, wherein the existing structural column passes through the newly constructed foundation slab, the bedding layer, and the base course sequentially from top to bottom, characterized in that... It includes a primary waterproof layer, a binding structure, backfill concrete, a secondary waterproof layer, and a reusable grouting pipe; a groove is set between the existing structural column and the base layer, the lower section of the primary waterproof layer is located in the groove and is fixed to the existing structural column by the binding structure, the upper section of the primary waterproof layer is bent and buried in the cushion layer, and the groove is filled with backfill concrete; the secondary waterproof layer is set between the existing structural column and the new base slab; the lower end of the reusable grouting pipe extends to the junction of the primary and secondary waterproof layers.
2. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 1, wherein: The primary waterproofing layer includes an EVA waterproofing membrane, geotextile, polyurethane sealant, and an externally applied EVA waterstop. The EVA waterproofing membrane and geotextile are stacked, with the lower section fixed to the existing structural column by a binding structure, and the upper section bent and embedded in the cushion layer. The lower end is sealed with polyurethane sealant between itself and the existing structural column. The EVA waterproofing membrane is installed close to the existing structural column. The externally applied EVA waterstop is installed on the upper surface of the upper part of the EVA waterproofing membrane.
3. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 2, wherein: A gap is left between the EVA external waterstop and the existing structural column. The EVA external waterstop is set around the perimeter, and the intersecting EVA external waterstops are closed into a ring by heat fusion connection.
4. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 1, wherein: The binding structure includes a metal hoop and stainless steel cable ties; the stainless steel cable ties are used for wrapping and binding, and the metal hoop is used to fix the ends of the stainless steel cable ties; there are two binding structures, one above the other.
5. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 1, wherein: The cross-section of the pit is an isosceles right triangle; the backfill concrete is C20 plain concrete, and the upper end of the backfill concrete is flush with the lower end of the subbase.
6. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 1, wherein: The secondary waterproofing layer includes a waterproofing agent and RS-elastic sealant. The waterproofing agent is applied to the surface of the existing structural column, and the upper and lower ends of the waterproofing agent are sealed with RS-elastic sealant.
7. The flexible waterproofing joint at the interface of an existing building and a new construction according to claim 6, characterized in that: The waterproofing agent was applied evenly in layers to the surface of the existing structural columns.
8. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 1, wherein: The number of repeatable grouting pipes is multiple, evenly distributed along the circumference, and set around the existing structural columns.
9. The flexible waterproofing joint at the structural interface of an existing building and a new construction in accordance with claim 1, wherein: The existing buildings include existing pile foundations, existing structural caps, and existing structural columns arranged sequentially from bottom to top. The lower sections of the existing pile foundations, existing structural caps, and existing structural columns are all located within the subgrade. A cushion layer is laid on the subgrade before the new structures are erected.
10. The flexible waterproof joint at the structural junction of an existing building and a newly constructed structure as described in claim 9, characterized in that: The new structure includes, from bottom to top, a new base slab, a new slope adjustment layer, and a new pavement structure, as well as a new crash barrier. The new crash barrier surrounds the existing structural columns, with its bottom connected to the top of the new base slab and its top higher than the new pavement structure. An inspection port is opened at the top of the new crash barrier, and an inspection cover is installed at the top of the inspection port. The upper end of the repeatable grouting pipe extends to the inspection port. A water-swellable waterstop strip is installed between the existing structural columns and the new crash barrier.