Device designed to reinforce the waterproofing of underground structures

Abstract

A process designed to reinforce the waterproofing of sensitive underground structures.

Description

Title of the invention: Device for Reinforcing the Waterproofing of Buried Structures

[0001] This device is intended to reinforce the sealing of the buried structures described below in Europe and in the French overseas departments and regions (DROM), by combining a sealing device (E) with one or more bentonite geosynthetics (GSB) in the role of mechanical protection and having the capacity for self-healing and adherent to the internal resistant structure (foundation slab).

[0002] . The intrados of bored or excavated tunnels (vault, pier).

[0003] . The extrados of covered trenches (upper slabs, abutments, foundation slab).

[0004] . Engineering structures under road, motorway and railway platforms with waterproofing under backfill.

[0005] • underground parking lots,

[0006] • Waterproofing of civil engineering structures and underground buildings,

[0007] • Foundation slab connected to a diaphragm wall type support (PM).

[0008]

[0009] DESCRIPTION OF MATERIALS

[0010]

[0011] GSB

[0012] Bentonite geosynthetics are presented as a manufactured product in the form of a sheet made up of materials comprising at least bentonite, in powder or granule form and one or more geosynthetics used as a support or container associated or not with a geofilm.

[0013] The bentonites used may be of the calcium, activated sodium, or natural sodium type.

[0014]

[0015] SEALING DEVICES.

[0016] DEG or Bituminous geomembrane or Geo composite or geofilm.

[0017] The DEG is a PVC geomembrane with a thickness greater than or equal to 2 millimeters, in accordance with paragraph 8.1 of booklet 67 title III.

[0018] The bituminous geomembrane is a reinforced polymer bitumen geomembrane, conforming to paragraph 8.4 of Fascicule 67 Title III.

[0019] Geocomposites or Geofilms less than or equal to 1mm are adherent to the internal resistant structure, identified by AFTES.

[0020]

[0021] COMPLEMENTARY MATERIALS.

[0022] Metal or plastic profile at a right angle.

[0023] Hydro-swelling material.

[0024] Adhesive material.

[0025]

[0026] IMPLEMENTATION ([Fig. 1])

[0027] The supports must comply with the specifications of article 9 of fascicle 67 Title III Sealing of underground works or with paragraph 9.2.2 of NF DTU 21 for building works.

[0028]

[0029] Under the foundation slab

[0030] Implement a first GSB with or without geofilm.

[0031] Implementation of a sealing device.

[0032] Implement the second GSB without geofilm covering the sealing device.

[0033] Place triangular concrete wedges 1 m long, spaced a maximum of 20 cm apart, on the overlap areas.

[0034] In the case of Geofilm or Geo composite adhering to the internal resistant structure, the upper GSB is unnecessary.

[0035]

[0036] With limited footprint

[0037] The GSB strips and processes mentioned in 3.2 are raised on the support.

[0038]

[0039] Integrated Structure - Molded Wall (PM)

[0040] Create in the lean concrete in contact with the PM a chamfer of 5 cm x 5 cm minimum.

[0041] Fill the chamfer by adding bentonite powder.

[0042] The first GSB is rolled out on the lean concrete and on the bentonite powder, in contact with the PM.

[0043] Mechanically fix the right-angled bent profile onto the PM, previously coated with hydro-swelling material on its vertical face in contact with the PM.

[0044] Implement the sealing device on the GSB.

[0045] The cover of the sealing device in contact with the profile is glued using the adhesive material.

[0046] Apply additional bentonite powder to the junction of the sealing device with the profile.

[0047] Implement the upper GSB which comes into contact with the PM and which will ensure the mechanical protection of the sealing device.

[0048] Place triangular concrete spacers, 1 m long, spaced a maximum of 20 cm apart at the GSB overlaps.

[0049] In the case of Geofilm or Geocomposite bonded to the internal load-bearing structure, the upper GSB is unnecessary.

[0050] The triple points are installed according to the procedure described in the GSB CCT.

[0051]

[0052]

[0053]

[0054] VERTICALLY WITH FOOTPRINT LIMIT Case-1 -DEG Attach the first protective GSB to the support using the PVC washers of the DEG.

[0055]

[0056]

[0057] Install the DEG, welded to the PVC washers. Apply the adhesive. Install the second GSB by bonding it to the adhesive and fix it at the top and above the waterproofing device.

[0058]

[0059]

[0060]

[0061] Case-2 - Bituminous geomembrane or geocomposite or geofilm. Mechanically fix the first protective GSB to the retaining wall. Install the bituminous geomembrane, or the geocomposite or the geofilm on the GSB.

Claims

[Claim 1] Demands Device intended for reinforcing the watertightness of buried structures such as a foundation slab connected to a diaphragm wall (PM) type retaining wall, characterized in that it comprises the following steps: - fill the chamfer by adding bentonite (B); - unroll a first layer called geosynthetic bentonite with or without geofilm (lower GSB) on the lean concrete (BP) and on the bentonite powder (B), in contact with the diaphragm wall (PM); - mechanically fix on the molded wall (PM) a profile folded at a right angle (P), previously coated with a hydro-swelling material (HG) on its vertical face in contact with the molded wall (PM); - implement a sealing device (E) on the lower GSB; - glue the sealing device cover € in contact with the profile (P) using an adhesive material (A); - add a layer of loose bentonite (B) to the junction of the sealing device € with the profile (P) - implement a second layer called geosynthetic bentonite without geofilm (superior GSB) covering the sealing device (E) and coming into contact with the diaphragm wall (PM); - In the case of a sealing device (E) having the capacity to adhere to the internal structure, the upper GSB is unnecessary - Place triangular concrete wedges 1 m long, spaced a maximum of 20 cm apart, on the overlap areas of the upper GSB.

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