CZ293594A3 - Process of performing deep building 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

Technical field

The invention relates to a method for carrying out deep construction work in the foot area of an existing landfill.

BACKGROUND OF THE INVENTION

In landfills for household and other waste, the problem often arises that existing installations for collecting leaking water and gases no longer meet current requirements or become unusable and therefore need renovation. Similarly, landfill substrate leakage problems arise because they do not meet the current requirements or have been violated due to local influences. If the drainage and sealing devices are to be repaired, it is often necessary to carry out construction work at the foot or bottom of the landfill. To enable this, it is necessary to excavate wells in the landfill body, which, depending on the height of the landfill body, can reach depths of up to 30 m. Digging such wells with known technologies for this purpose is extremely expensive and also involves a number of other problems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of carrying out construction work in the area of the foot of an existing landfill that is easy to carry out at low cost and has a high degree of occupational safety.

SUMMARY OF THE INVENTION

The problem is solved and the drawbacks of the known methods of this kind are largely eliminated by the method of carrying out deep construction work in the foot of the existing landfill, according to the invention, which consists in boreholes and these shafts are interconnected at the level of the foot of the landfill through a tunnel into a passable working space.

With the method according to the invention, by means of shafts of relatively small volume which are connected to each other by tunnels, a sufficiently large working space can be created at the foot or bottom of the landfill to carry out the necessary construction work. Due to the fact that the shafts are made of large-diameter boreholes, which are covered with pipes, a stable and safe work is achieved and the amount of earthworks required is minimized. As a result, the site space required in the landfill is also small, so that any interference with the normal operation of the landfill can also be minimized. In addition, the degassing of the landfill is largely avoided because the shaft walls are tight. Similarly, undesirable oxygen access to the landfill will also be reduced.

Furthermore, it is advantageous if the working space at the level of the foot of the landfill is ventilated through the shafts. This ventilation of the working space at the level of the foot or bottom of the landfill can be very effective due to the described shaft design because the ventilated volume is small and the air flow path is also clearly determined. The drainage of manholes, which may be inevitable in a technically simple manner, is equally easy.

Advantageously, the excavation of the shafts up to the landfill foot is carried out by machine and immediately above the landfill foot is carried out manually to prevent damage to the landfill base seal.

The method according to the invention is particularly suitable for successive repairs. According to the invention, after the completion of the construction work in the working space formed by the pair of shafts and the tunnel, the pipe sheathing of the first shaft is pulled out and on the opposite side of the second shaft a sheath is excavated by a third tube. In this way, it is achieved that the individual working spaces are mutually connected at the level of the foot or bottom of the landfill, while in the landfill body the shafts are arranged at a distance from one another. The material extracted during the excavation of the third shaft can be filled again with the first shaft if it is not to be preserved.

The method according to the invention is also suitable for the formation of gas wells at certain intervals when the pipe shafts are pulled out of the pipes or for the inspection shafts to be formed at suitable points, for example when the drain pipes enter the main collector.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an arrangement of two tunnels connected to each other to form a working space for the renovation of drainage pipes at the foot or bottom of the landfill by the Berstlining method in FIG. by arranging the shafts of FIG. 1 in the plane A - A of FIG. 1

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows two wells 1, 2 formed by large-diameter boreholes which are embedded in pipes. The shafts 1 are excavated through the landfill body 3 to the foot 4 of the landfill. The shafts 1, 2 are accessible to the operator and have a diameter of approximately 2.5 m. The mutual distance between the axes of these shafts 1, 2 is approximately 2.5 m. created in a mining way. Also, the tunnel 5 is accessible to the operator and has a height of approximately 2 m and a width of approximately 1 m. The landfill body 3 is reinforced by the pile piles 6 around the tunnel 5. The walls of the tunnel 5 can additionally be reinforced with plates and sealed. Both the shafts 1, 2 and the tunnel 5 are located immediately above the drainage pipe 7 formed, for example, of earthen drainage pipes, which is laid on the gasket

8. landfills and covered by gravel bed 9.

Owing to the described arrangement of the shafts 1, 2 connected to each other by the tunnel 5, a working space is created above the drainage pipe 2, which, as shown in FIG. For this purpose, stoneware drainage pipes are removed inside the working area. Subsequently, a new pipeline 10 is introduced into the working space through the second shaft 2, at the end of which a berstlining-rocket 11 is attached, by means of which the pipeline 10 is drawn into the existing tubular duct in the drainage pipe 7 thereby destroying the existing earthenware drainage pipes. The process is supported by a traction cable 12 previously introduced into the drainage pipe 7. The traction cable 12 passes through the drainage pipe 2 to another set of two manholes built above the drainage pipe 2 ^ν θ at a suitable distance from said manholes 1, 2 or where it is attached

4- S s' r τ

- 5 to a winch not shown. The conduit 10 is guided by the guide rollers 13, which are arranged in the second conduit 2, when drawn into the second shaft 2. On the surface of the landfill body 3, the conduit 10 is secured by a roller carriage 14.

After the pipeline 10 has been drawn into the drainage pipe section 2 shown in FIG. 1 on the left, using the same procedure through the first shaft 1, it introduces another pipe 10 into the drainage pipe section 7 shown in FIG.

The working space is ventilated during this construction work, for example by means of a fan (not shown), which blows fresh air into the first shaft 1. At the bottom of this first shaft 1 air passes through the tunnel 5 into the second shaft 2 through which it leaves the working space again.

Upon completion of the shafts 1,2 and these construction work, the tubular sheeting of the shafts 1, 2 is pulled out again with the landfill material.

The method according to the invention is also suitable for the construction of a main collector under a landfill. In this case, two pipes of the steamed shaft are gradually excavated to the bottom of the landfill, with a distance of approximately 7.5 m between them and a tunnel connection between them. Subsequently, in the working space thus created, collecting tubes are placed in the tubular bed at the bottom of the landfill, which are filled with gravel backfill and filled again. After the collector section is built, the shafts of the first shaft are pulled out and the third shaft is excavated behind the second shaft, which is again connected through the tunnel to the second shaft. Now the construction of the main collector can continue from the second shaft to the third shaft. In this way the pipeline of the main collector is gradually built.

Claims (4)

PATENT CLAIMS Method for carrying out deep construction works in the area of the foot of an existing landfill, characterized in that two through-going shafts (1, 2) formed by pipes embedded in large-diameter boreholes and these shafts (1, 2) are spaced apart from one another ) at the level of the foot (4) of the landfill is connected through a tunnel (5) into a through working space. Method according to claim 1, characterized in that the working space at the level of the landfill base (4) is ventilated through the shafts (1, 2). Method according to one of the preceding claims, characterized in that the excavation of the shafts (1, 2) up to the vicinity of the landfill foot (4) is carried out by machine and is carried out manually above the landfill foot (4). Method according to one of the preceding claims, characterized in that after completion of the construction work in the working space formed by the pair of shafts (1, 2) and the tunnel (5), the tubular sheeting of the first shaft (1) and on the opposite side of the second shaft ( 2) excavate the shaft, which has been buried in the third pipe, and connect it through the tunnel (5) to the second shaft (2).