DE102008001109A1 - Drainage of a shotcrete shell with drainage pipes - Google Patents

Abstract

Drainage system of a slope protection, consisting of a shotcrete shell, which are installed for draining the underlying slope material drainage pipes, each consisting of at least two sections between which a geotextile in the pipe cross-section to prevent soil discharge through the pipe and fixed by suitable means.

Description

Technical area

The Invention includes an economical solution for the drainage of a made of shotcrete slope protection.

State of the art

It is known, construction pit, ditch or Hangböschungen means secure a shotcrete shell. These can basically be used in cohesive and non-cohesive soils. So far, however, their use in non-cohesive soil is not widespread. Reasons for this are the production of the shell with inclinations up to 85%, which is temporary due to the system Stability of the unsecured soil requires, as well as the necessary Drainage of the slope material behind the shotcrete shell.

Especially when the occurrence of layered water is to be expected, shotcrete shells must be formed with drainage openings or with a filter layer between the shotcrete layer and the slope material so that the water can be discharged without damage. The basic requirement of drainage systems is mentioned in the current standardization (see Draft DIN EN 14490 (2007) , including 8.5 Drainage of front training). However, detailed information on the design of this drainage are not made in it. Basically, two types of drainage are possible:

1) Drainage behind the shotcrete shell

The Drainage of the slope material behind a shotcrete shell is often done with a drain mat between slope material and shotcrete shell. This is created mainly from vertical stripes, collects the accumulated water behind the shotcrete and conducts it to a horizontal drainage pipe at the foot of the wall. With this training the drainage is special care required in the joint area of the individual drainage mats to produce a continuous water-draining strip.

By the dynamic load during installation of the shotcrete consists the risk of damaging the drain mat and through the systemic rebound that a pollution of the Drainage line at the foot of the shotcrete shell.

Provided non-binding soils are present in the area of the shotcrete shell, In addition, a local outbreak of soil material can not be excluded become. As a result, voids behind the drain mat are possible, so that the shotcrete shell not frictionally on the ground is applied. For the production of adhesion between slope material and shotcrete shell ground movements are required, which is the Risk of subsidence.

at this frequently used form of drainage behind the shotcrete shell there is a risk, not a permanent one Functionality of the drainage to achieve. In addition is a control of drainage by their location behind the shell not more is possible.

The Production of the flat drainage layer and the required Drainage line are also very time consuming and mean one considerable impairment of the production of the shotcrete shell, with corresponding effects on the profitability of this Method.

2) Drainage in front of the shotcrete shell:

to Ensuring a permanent drainage function will help the water this method by means of suitable passages through the Shotcrete shell out. These passages can as drainage nozzles or drainage slots be formed in the shell. Especially with permanent spray concrete fuses is the planned installation of recess tubes mounted in the shell, the before the installation of the shotcrete on Ground fixed and "injected". The grid the recess tubes to be installed is based on empirical values determined for the respective subsoil.

The Drainage of non-cohesive soils requires because of their higher Permeability a filter-stable design for the safe and permanent discharge of water. The following described system provides this in a simple way and is suitable especially for use in non-binding soil.

Object of the invention

It Object of the invention, a method and suitable devices to create, with which a drainage through a shotcrete shell secured slopes easily, quickly and therefore economically produced can be. It should also be ensured that no slope material over the discharged groundwater escape through the shotcrete shell can and consequently prevents cavitation behind the shotcrete shell becomes.

Presentation of the invention

The drainage of the upcoming soil behind a slope protection made of shotcrete is done via introduced in grid in the ground drainage pipes. The drainage pipes used for use consist of at least two sections, between which a geotextile arranged in the pipe cross section to avoid soil discharge through the pipe and with suitable means, eg. B. by clamping in a socket connection (see 1 ), is fixed.

In front the mating of the two parts (eg spigot inserted in sleeve pipe or in a sleeve sleeve) is the spigot covered with a geotextile mat after joining the two parts of the pipe cross-section permanently against soil discharge closes and so a discharge by outflowing Groundwater prevented. The geotextile mat can according to the pending subsoil can be varied. If necessary, the earth side Pipe on the slope partially or completely by suitable filter material be filled.

The Earth side section of the prepared drainage pipes is with variable incline / fall in the profiled embankment surface pressed. In this case, the area of the pipe joint is arranged so that he is in the area of the shotcrete layer. In this way it is ensured that due to the other outside diameter a mechanical anchoring of the drainage pipe in Concrete takes place, which ensures its position permanently, which is one-piece smooth pipes is not the case.

The air-side pipe end is now provisional at the latest sealed against penetrating shotcrete and then the shotcrete shell produced.

After completion of the shotcrete shell the provisionally closed airside pipe end is opened again and, if necessary, cut with suitable tools, u. U. even aligned flush with the surface of the shotcrete shell (see 2 ).

The Figures show a preferred embodiment with Drainage pipes consisting of only 2 parts and one of which is a spigot, the other a spigot, between which a geotextile is trapped as a soil filter.

1

Air-side drainage pipe, preferably of commercially available goods in the diameter range of 50-300 mm, spigot wrapped with 2

2

geotextile, preferably in commercial version

3

Earth-side drainage pipe, make like 1 , shown as a tube with molded sleeve at the junction

4

built Drainage pipes for drainage of the upcoming Soil, shown with a slope to the air side of the shotcrete shell, with sleeve connection between the two items, arranged in the area of the shotcrete shell and after shortening the airside pipe end

5

Shotcrete as slope protection

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited non-patent literature

• - DIN EN 14490 (2007) [0003]

Claims (10)

A method for producing a drainage system for a slope protection, consisting of drainage pipes penetrating a shotcrete layer for discharging the accumulating in the slope material behind the shotcrete shell water, characterized in that a) the drainage pipes are made of at least two juxtaposed and interconnected parts, wherein before the joining of which at at least one of the joints a geotextile mat over at least one of the open cross sections of the pipe ends to be joined is attached, said geotextile mat after joining / joining the two pipe ends is well permeable to water, but the pipe cross-section permanently against the discharge of hangseitigem ground through closes the derived slope water; b) providing the drainage pipe at the airside end of the assembled pipe with a provisional closure for the duration of manufacture of the shotcrete shell, placing it in the slope to be secured at the designated variable slope / counterfall location and ensuring its location during the shotcrete shell production process; wherein the region of the pipe joint is arranged so that it is in the region of the shotcrete layer, which ensures that due to the other outer diameter here, a mechanical anchoring of the drainage pipe takes place in the concrete and its position is permanently secured; c) after completion of the shotcrete shell the provisional closure of the over the surface of the shotcrete shell reaching airside pipe end is removed or sawed off together with the pipe end, so leaked through the pipe slope water drain on the surface of the shotcrete shell down and through a on the air side the shotcrete shell arranged drainage pipe can be detected and derived. Method according to claim 1, characterized in that that the drainage pipe from commercial Ware is created, with the spigot of a pipe with the Geotextile mat is spanned and then into the muffing end the other tube is inserted, causing the geotextile mat clamped as a filter and thereby fixed. Method according to claim 1, characterized in that that the at least 2 parts of the drainage pipe to their joints connected by sliding sleeves become. Drainage pipe for the process according to at least one of claims 1 to 3, characterized that it consists of at least two sub-pipes and at least a junction of the sub-pipes whose cross-section through a geotextile mat fixed in a filter-like manner. Drainage pipe according to claim 4, characterized that the geotextile mat according to the required filter stability is selected. Drainage pipe after at least one of Claims 4 and 5, characterized in that the drainage pipe at the connection of the sub-pipes at the end of a sub-pipe over a sleeve, at the end of the adjacent sub-pipe over a has spiked spigot in this socket. Drainage pipe after at least one of Claims 4 and 5, characterized in that the compound two adjacent sub-pipes by means of a sleeve sleeve he follows. Drainage pipe after at least one of Claims 4 to 7, characterized in that the slope-side Pipe end of the drainage pipe up to the Geofiltermatte filled with suitable filter material partially or completely is so as to minimize the flooding of slope material into the pipe. Drainage system of a slope protection, consisting from a shotcrete shell, into which for drainage of the underlying slope material drainage pipes are installed according to at least one of claims 4 to 8. Drainage system according to claim 9, characterized characterized in that over the surface of the Shotcrete shell reaching air-side pipe end of the drainage pipes after completion of the shotcrete shell down to the surface the shotcrete shell is shortened so that through the tube derived slope water directly on the surface the shotcrete shell can drain.