HUT72260A - Process for carrying out civil engineering works - Google Patents

Abstract

According to a process for carrying out civil engineering works in the area of the sole (4) of an existing waste dump, passable shafts (1, 2) designed as mutually spaced, cased large hole borings are sunk down to the waste dump sole (4). At the level of the waste dump sole (4) the shafts (1, 2) are interconnected by a passable tunnel (5), forming a continuous working room. A sufficiently large working room is thus simply created above the waste dump sole (4) for carrying out sanitation works.

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for civil engineering work at the bottom of existing landfill sites.

Landfills and landfills often have the problem that existing equipment for trapping water and gas is no longer compliant or has become unusable and therefore needs refurbishment. There are also problems with the impermeability of the landfill site base because the impermeability of the landfill base is no longer adequate or is due to site conditions. If these dewatering and sealing structures are to be rebuilt, it is often inevitable that construction work be carried out at the bottom of the landfill site. To enable this, the rubbish mass of the landfill site must be penetrated by manhole structures which, depending on the height of the rubbish bin, can reach a depth of up to 30 m. The production of such shaft structures by conventional mining operations is extremely costly and has a number of additional drawbacks.

It is an object of the present invention to provide a method for underground construction work at the bottom of existing landfill sites that is simple, low-cost, and highly safe.

According to the present invention, this object is solved by extending walkable shafts formed as large holes drilled at a distance from each other to the bottom of the landfill site, and passing these shafts with a walkable tunnel at the height of the bottom of the landfill site. • you ···· »·» · · · · · · · ·

- 3 connected together to form a coherent workspace.

According to the process of the invention, with relatively small volumes of shafts interconnected by tunnel sections, a sufficiently large working space is created at the bottom of the landfill site for the necessary construction work. By designing the shafts as large bore holes, they provide stable and secure protection and minimize the volume of soil to be extracted. The space required for a construction site at a landfill site is low, so that the actual operation of the landfill site can be minimized. The escape of gas from the landfill site is largely avoided as the drained manhole walls are closed. Accordingly, undesirable oxygen delivery to the landfill site is also kept low. Ventilation of the working space according to the invention at the height of the bottom of the landfill site in accordance with the method of the invention can be made very efficient by the arrangement of shafts, since the volume to be ventilated is small and the flow path is clearly predetermined. The technically simple way in which the wells may be required to hold water is also realized. The dredging of the shafts is preferably carried out by mechanical means. Mines should only be deepened manually at the bottom of the landfill site to avoid damaging the base seal of the landfill site.

The process according to the invention is particularly suitable for multi-step resolution work. Thus, in accordance with the present invention, after completion of construction work in a work space consisting of two shafts and a tunnel section, the first manhole is pulled out and a third manhole is removed on the other side of the second manhole. • ··· »·» «·« • · 4 · · 4 * • 4 · »·« 4 4 ·· 4 ·

- 4 are recessed and connected to the second shaft via a passable tunnel, whereby each working space is connected to one another at the height of the bottom of the landfill site, while there are manhole apertures spaced apart on the trash of the landfill site. When dredging the third shaft, the excavated material can be used to fill the first shaft if they do not want to maintain it.

The process according to the invention is also suitable for constructing gas wells at a distance from each other during the extraction of manholes, or for setting up manholes at suitable locations, for example where drainage pipes end up in a main manifold.

Here is an example of our invention! Embodiments of the invention will be described in more detail by means of the drawings, of which

Figure 1 is a cross-sectional view of two manhole-interconnected manhole layouts, which provide a working space for the rehabilitation of a conduit for water leaking at the bottom of a landfill site by fracture liner;

Figure 2 is a sectional view of the manhole arrangement of Figure 1 taken along line A-A.

Figure 1 shows two manholes 1 and 2 formed by boreholes with large holes. The shafts are recessed through the trash mass 3 to the bottom 4 of the landfill site. Mines 1 and 2 are walkable and have a diameter of approx. 2.5 m. Their centerline distance is approx. 5.5 mm. At the height of the bottom 4 of the landfill site, the two mines 1 and 2 are connected by tunnels 5 which are started in mining mode. The tunnel 5 is also walkable and has a height of approx. 2.0 m wide and 1.0 m wide. 6 skewers littered around the tunnel 5 with the rubbish 3 »W.

• · · · · · · · · 999 «· *» ·

-5biztosítják. The tunnel walls can additionally be supported and sealed with sheets. The two shafts 1 and 2 and the tunnels 5 are directly above the tunnel 7, which consists of, for example, stone clay pipes, is laid on the bottom seal 8 and is covered with pebble bed 9.

With two layouts 1 and 2 connected to the tunnel 5, a working space is created above the tunnel 7, which allows the tunnel 7 to be renovated using the known bursting liner method as shown in FIG. To do this, we are building stone clay pipes in the work area. Then, through the shaft 2, a new pipe strand 10 is introduced into the work space, at the end of which a burst liner 11 is secured, and the strand 10 is pulled into the existing substrate by simultaneously crushing the existing clay pipes by means of the burst liner 11. The transmission is facilitated by the pulling rope 12 previously introduced into the tunnel 7. The pulling rope 12 leads through the tunnel 7 to a second manhole arrangement at a sufficient distance from the two manholes 1 and 2 above the tunnel 7 or to a lock pit located next to the landfill site and is led thereon to a winch. When retracted, the pipe strand 10 is guided on guide rollers 13 located in the shaft 2. On the trash 3 a roller carriage 13 guides the pipe strand 10.

After inserting the pipe strand 10 into the left section of the tunnel 7 shown in FIG.

• ·

During these construction works, the work space is ventilated, for example, by introducing a fan into the shaft 1 with fresh air, which enters the tunnel 5 into the shaft 2 at the bottom of the shaft 1 and leaves the work space through the shaft 2.

After the construction work has been completed, the drains of shafts 1 and 2 are pulled out and the shafts are refilled with trash.

The process of the invention is also suitable for producing a main manifold under a landfill site. For this purpose, two pipe mines were separated by approx. At a distance of 7.5 m, we deepen to the base seal and establish a tunnel connection between the shafts. The manifolds are then laid in a tube bed at the bottom of the landfill site, surrounded with gravel and embedded again. If a section of the main manifold is integrated, the drainage of the first manhole is pulled out and a third manhole is dug behind the second manhole, which also connects to the second manhole. Thus, the main manifold can be constructed from the second manhole to the third manhole, thereby forming a cascade of the main manifold manifold.

Claims (4)

PATENT CLAIMS A method for civil engineering work at the bottom of existing landfill sites, characterized in that walkable shafts (1, 2) formed as large holes drilled at a distance from each other are deepened to the bottom (4) of the landfill site and that these shafts (1, 2) by connecting a tunnel at the height of the bottom (5) of the landfill site to a coherent working space. Method according to claim 1, characterized in that the working space is ventilated at the height of the bottom (4) of the landfill site on the manholes (1, 2). Method according to claim 1 or 2, characterized in that the shafts (1, 2) are mechanically deepened to a depth close to the bottom (4) of the landfill site and manually deepened directly above the bottom (4) of the landfill site. 4. Method according to any one of claims 1 to 3, characterized in that after completion of the construction work in the working space consisting of two shafts (1) and one tunnel, the first shaft is pulled off and a third shaft is deepened on the other side of the second shaft. with a second shaft.