DE2736298A1 - DEVICE FOR INJECTING SELECTED SOIL LAYERS - Google Patents

Description

l'ATKNTAW \ VÄI, Tii

DIPL. ι NG. AMTHOR O »7 O C 1 Q O

DiPIi ₁ -INO. WOLF LI OD L O Ό

GKN Keller GmbH "'·« -hankfobt α.μ..9 · Β.

KaiaerleiBtraBe UU _- «« «- ■ - ··« ·.

6o5o Dffenbach 3 ZZZL ...-. ¹⁹⁷⁷

(13οο3)

Device for peckerlasen injection of selected soil layers

The invention relates to a device for packerless injection of selected gravel or sandy soil layers, consisting of an injection tube that can be opened like a vent Outlet openings for the injection agent.

Gravel or sandy soil layers can be injected solidified or sealed against water. The solidification bodies are generally part of foundation measures for the renovation of existing structures or securing the construction of new structures. Sealing body of such injection body takes place today i.a. according to the so-called Manechettenrohrverfahren under Use of so-called injection packers. Such methods are particularly labor-intensive with long injection pipes tied together. Diea meets special requirements for horizontal sealing soles for construction pits, which, for static reasons, often have to be created much deeper than the construction pit.

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The top of the completed sole sealing pending soil must then be removed to the bottom of the excavation, whereby the Under no circumstances should any injection tubes remaining in the ground be removed from the injection body may be pulled out.

With a considerable amount of work, therefore, these pipes must be in front At the beginning of the excavation, so as not to endanger the tightness of the injection measures.

Injecting devices are well known. In the case of the so-called ram lance method, the injection material is rammed in and Pulling a pipe rod continuously or in batches into the surrounding subsoil (loose rock).

In the so-called valve tube process, holes are drilled in beforehand so-called valve pipes installed, which are provided with valves at regular intervals. By a so-called double packer, for example according to the DT-PS 2 o <tl 758, which is attached to a linkage or to is attached to a hose, each valve can be pressed one after the other so that a homogeneous penetration of the surrounding soil is possible.

The disadvantage of the methods and devices mentioned is the great amount of work involved, especially when installing and removing the Valve tubes and PBCker linkage are created at great depths.

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The invention is based on the object for solidification and sealing of gravelly vein sandy, i.e. injectable Soil layers such a simple, effective and manpower-saving device and thus a simplification of the device to be carried out with it Working method that requires neither the use of a packer nor the step-by-step pulling of pipes is, and that the actual injection part of the device can be left in this layer without difficulty and without damaging the injected soil layers.

This object is achieved according to the invention by the combination of the following features:

a) a sealed and detachable connected to the injection tube part Upper pipe part with supply connection for the injection medium;

b) at least one area arranged on the injection tube part with the access openings through an euBen on the pipe arranged, expandable sealing cuff are covered;

c) Slidable sliding sleeves arranged in the pipe with centric Through-flow channels whose upper opening is designed as a valve seat and

d) Arrangement of a sliding sleeve in the upper part of the pipe above the connection point of the two pipe parts and in the area of the Outlet openings, covering them from the inside.

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The device is preferably further developed in this way that the diameter of the flow channels of the individual sliding sleeves are increasingly designed in relation to their arrangement in the tube from bottom to top.

The injection tube here is a simple one, preferably made of Plastic pipe that is inserted into the borehole or, in a special embodiment, flushed into the ground is and its injection part after pressing with its accessories (sealing sleeve ^ valves and the like.) In Borehole remains. The annular space of the drilling or flushing hole is sealed with a blocking agent, so that the injection sites Sealed above and below the relevant injection valves (sealing sleeves) and the injection tube is firmly integrated is. The sliding sleeves can be locked from the outside, including it is to be understood that the closure is effected from the working plane, the closure which can be effected from the outside Sliding sleeves preferably entered by means of the injection stream and balls adapted to the valve seat can be brought about.

To separate the tube cap from the injection section without difficulty to be able to, the two pipe parts are sealed and releasably connected to one another, wherein in an advantageous development both tube parts with a spring clip verraatungseinrichtung are locked or coupled, the upper free ends of which into the lower opening of the upper sliding sleeve seated in the upper part of the pipe are arranged pointing.

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As a result, after entering a last one, dimensioned accordingly Ball into the injection material stream that is required under pressure The upper sliding sleeve is pressed downwards and the locking is released and the upper part of the pipe can be easily pulled after ee at least initially under the pressure of the injection agent himself from the liaison office.

In the solution according to the invention can therefore be advantageous completely ahne packers and cutting tools for separating the injection pipes the injection can be carried out, which is associated with a considerable saving in manpower, with the packer normally at the drilling depths in question here are gradually graduated and laboriously drawn again piece by piece got to.

The device according to the invention, further details and advantages are explained in more detail below with reference to the graphic representation of an exemplary embodiment.

It show schematically Fig. 1 is a section through an injection tube in the

first phase of work;
Fig. 2 shows a section through the same tube in the

final phase after injection of a bottom layer of soil; Fig. 3 shows the same pipe in the final phase for separating the pipes and

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2736299

U shows an enlarged section through the connection point of the upper pipe part to the injection pipe part.

In the Fig. L- <»are denoted with 1 the bus plastic existing injection ^{pipe as a whole, with I 1} the upper part of the pipe, with 1 ″ the injection pipe part, with 2 its outlet openings, which are attached in different heights and shielded by expandable sealing cuffs 9, and 3 with the Through channels k, l * ', W provided, with G-rings sealed sliding sleeves, of which the sliding sleeves k, U * are when the pipe is inserted into the ground (diameter approx. Uo - 50 mm) at the level of the outlet openings 2 and these shield first.

The diameter of the through-channels Ί, <* ', <* "are different, ie that of the lowest sliding sleeve 3 is the smallest and that of the uppermost sliding sleeve 3 is seated in the upper tube part I ¹ above the connection and locking point Io.

At the upper end of the injection tube part 1 ″ is a spring latching device 11 od spring clips their ends 12 in the direction of the lower opening of the upper sliding sleeve 3 iron (Fig. It).

In order to be able to flush the entire pipe 1, if necessary, is the end of the advance 5 with an opening 6 pointing in the forward drive direction provided, wherein in the Uortriebsende 5 a lockable only upwards Valve 7 (e.g. designed as a ball valve as shown) is arranged. 909808/0301

When the entire pipe 1 is flushed in, flushing or injection medium is introduced into the pipe under pressure from pben, which can pass through all the sash sleeves 3 without moving them and through the valve 7. When the pipe is brought to the desired depth, a ball 13 that closes the through-channel U is also entered, whereby on the one hand the full pressure on the lowermost sliding sleeve 3 is effective and the flow to the flushing opening 6 is interrupted and on the other hand this sliding sleeve, leaving the lowest outlet openings 2 free downwards is pressed.

Counterpressure that may be effective through opening 6 is created by the valve 7 intercepted. Since the openings 2 are now exposed, the sealing sleeve 9 is lifted off somewhat and the injection agent can penetrate the soil layer A. Once the soil layer A has been injected, the next sliding sleeve, if any, 3 with the somewhat larger through-channel <t * again a corresponding one Ball 13 * introduced so that this sliding sleeve 3 also moves downwards and the next soil layer B in can be injected in the same way.

Once the entire injection process has been completed, it is a matter of separating the upper part of the pipe 1 ', for which the same lead is used, ie a ball that is correspondingly larger for the through-channel is inserted ¹ is pressed downwards, the ends 12 of the spring clips being grasped and pulled inwards, thereby releasing the locking of the two tubular parts.

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Since the upper pipe part 1 'is closed at the top except for the inflow opening, this upper pipe part lifts itself out of the ground to a certain extent and can then be easily pulled while the injection pipe part I ¹ remains untouched in the ground.

The closure of the sliding sleeves 3 does not necessarily have to be with balls be carried out, but it is also possible to have the same effect (not shown) on the inflow side of the through channels to provide a small valve closure, which after feeding a certain amount of injection agent, for example. With an upward The cord pull is closed with the same consequential effect for the sliding sleeve in question.

In the embodiment shown in the figures, corresponds to Length of the lower actual injection part of the desired thickness of the injection layer, that is, a length of about 1 to 2 m. The length from there to the connection or locking point corresponds to the remaining soil thickness between the injection layer and the desired excavation base and the The remaining length then runs to the surface of the ground.

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Claims (1)

Patent claims: M.jUdevice for injecting selected, gravelly or sandy soil layers consisting of an injection pipe with Outlet openings for the injection agent that can be opened like a valve, characterized by the combination of the following characteristics a) an upper pipe part (I ^{1), which is sealed and detachably connected to the injection pipe part (1 ″} ) and has a supply connection (1 **) for the injection agent; b) at least one ^{area arranged on the injection tube part (l n} ) with the outlet openings (2) which are covered by an expandable sealing collar (9) arranged on the outside of the tube; c) Slidable sliding sleeves (3) arranged in the pipe (1) with central flow channels (* ♦, * ♦ ', V), their upper opening is designed as a valve seat and d) Arrangement of a sliding sleeve (3) in the ^{upper pipe part (I 1} ) above the connection point (lo) of the two pipe parts (I ¹ , 1 ") and in the area of the outlet openings (2), covering them from the inside. 2. Apparatus according to claim 1, characterized in that the diameter of the flow channels Ck, «♦ ', * ♦") of the individual sliding sleeves (3) are increasingly designed in relation to their arrangement in the tube from bottom to top. 909808/0301 3. Apparatus according to claim 1 and / or 2, characterized in that the two pipe parts (l ', l ⁿ ) are locked in the region of their junction with a spring clip locking device, the upper free ends (12) of which in the lower opening of the upper, im Upper pipe part (I ¹ ) seated sliding sleeve (3) are arranged ueisend. U. Device according to any one of claims 1-3, characterized characterized in that arranged below the bottom Sliding sleeve (3) is one in the forward drive direction Pipe opening (6) closing valve (7) is arranged. 5. Device according to Anapruch! », Characterized in that that the valve (7) is designed as a ball valve. 6. Device according to any one of claims 1-5, characterized in that the pipe parts (l ', l ") and the Sliding sleeves (3) are made of plastic. 909808/0301