DE1913101A1 - Method and device for laying underground pipes, for example drain pipes - Google Patents

Description

DA-3196

B. β a, ο fa r e. i b -u η κ BU of the patent application

Ainsley Neville EDE
£ 3> Thornton Way, Cambridge, England

concerning

"Method and device for laying buried pipes» for example drainage pipes "

Priority; 18 »March 1968, Ur ₀ 12783/68 , Great Britain

The invention relates to laying iron underground pipe lengths, for example of drainage pipes, in place in that a Underground tunnel formed by a plow and a Length of pipe in the tunnel is pulled into its required end position maybe a single length of over 100 ι (350 feet) and one Diameter of 45 square meters or more {18 "or more) laid in the earth be opened without a trench to accommodate the pipe must become. Either the underground tunnel is first through a formed and then full pass of mole plow

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a Rohrläiige into the preformed tunnel _9, for example by winding, drawn ^ or is the pipe length _P towed behind the advancing plow blade so that it is progressively drawn into the tunnel when the latter is formed by the passage of the plow through the soil.

A difficulty which arises in trenchless pipe laying as a result of the very considerable soil friction must be overcome when the pipe length is pulled into the newly formed tunnel "especially if the tunnel is at a considerable depth" below the ground, as can be ascertained that the Bodenreibiing approximately directly proportional to the depths of the earth due to the earth pressure as a result of compression changed »object of the invention is a reduction in this change of soil friction with the tunnel tiefe- as well as the reduction of the total" Bodan friction, which the tube is subject to ₉ when it is in the tunnel is pulled "and also when working in loose soil or in quick sand or under water-saturated conditions to stabilize the tunnel against collapse ^ before the pipe is pulled into it", as well as the creation of an improved and stabilized bed for the pipe ₀

According to the invention, a liquid slurry of clay or cement or binding soil or a mixture of two or more thereof with or without any further component or further components and similar DET _o sludge or the sludge as

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is commonly used in drilling in earth * in d @ n tunnel injected _t which is formed by the plow before the pipe length taken into the tunnel vrird _f wherein the slurry serves to lubricate the pipe during its movement along the tunnel. It can be stated that the presence of the mud in the tunnel insulates the pipe to a certain extent against direct contact with the tunnel wall and not only significantly reduced the frictional resistance of the pipe but also made this resistance practically independent of the depth of the tunnel below the surface

As a precaution, the sole or “main component of the sludge is bentonite, which is a montmorillonite clay in a dried and ground form that can absorb water in large quantities of up to two hundred thousandths of its own volume due to a physicochemical effect” mixed with water in suitable quantities * forms. Eentonite is a gelatinous mass with thixotropic properties that is pumped down into the tunnel formed by the plow by a pump of the displacement type, for example a screw conveyor pump or a Hono pump, either in small amounts or in amounts that are limited solely by the available space Furthermore, the sludge can be driven down into the underground tunnel by pneumatic pressure which is exerted, for example, on a closed funnel which is connected to a supply pipe _B. that leads down into the tunnel. In this

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The case is preferable a metered by a control valve flow rate if the whole available Schlämmaraenge would otherwise be lost from the tunnel in a bottom cavity _o

Instead of a sludge in the form of a simple mixture of bentonite and water, this can consist of a mixture of bentonite and soil in water and has, for example, a mixture in the ratio of about SO; SO of bentonite and soil in water proved to be satisfactory «Either the mixture can be premixed before delivery or the bentonite sludge can be conveyed separately into the tunnel and in this place with the soil of the tunnel wall by means of a mechanical Underground mixer _e that is dragged behind the plow _{8 can be} mixed ₀

^ Furthermore, & can uch a Genisch of bentonite and cement in water used as a slurry which hardens and forms a fe "stes bed for the pipe after the latter has been pulled into position"

To demonstrate the effectiveness of the invention, a bare pipe of 106.68 m (30 feet) in length and a diameter of 15.24 cm (6 "), which is sucked into a bare earth tunnel _D which is through a mole plow being formed will require a pulling force of 907 kg (2000 lbs.oWte) at a depth a few inches below ground level ^ what pulling force

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increase with a substantially rectilinear characteristic to about 18,144 kg (40,000 lbs _B wt ") at 3. OS a (10 feet) depth. However, if the tunnel contains a bentonite sludge into which the pipe is pulled in such a way that the sludge surrounds the circumferential surface of the pipe being advanced and insulates it from direct contact with the soil, the pulling force on the pipe is essentially constant at around 907 kg (about 2000 lbs.vrt ") can be expected at all depths to at least a depth of 3.05 m (10 feet)"

The Rohryerlegungsarbeit can be performed in two ways ₀ Either it can be a full length of the tunnel are first formed by one pass of the mole plow ^ the slurry is pumped through a channel in the plow iron down and be supplied to the tunnel behind the plow so that the tunnel completely fills, and then, if the mole plow has finished its passage _8, a length of pipe can be pulled into the tunnel filled with sludge by a rope and a winch, or the length of pipe can be dragged directly behind the plow in front of it _{B so} that the pipe is progressively pulled into the tunnel as the latter is formed by the plow, the sludge being pumped over the plow iron into the space in front of the front end of the pipe and around the circumference of the pipe »

In the first case, an expander of essentially

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lichen widening hollow shape at its narrower end and preferably by means of an articulated connection on the pipe pulling rope immediately in front of the pipe length to widen the newly formed channel before the main part of the pipe length enters it, and the sludge is in the soil that forms the circumferential surface of the tunnel, pressed by the expander and also enters around the expander and possibly through openings in the expander into the enlarged space behind the latter, around the advancing pipe length with a _{# /} circumferential layer of the sludge of perhaps 12.5 to 25 1/2 "to 1" (mm) thick.

Preferably the expander is of such a shape that the bottom of it follows the path formed by the underside of the mole flight ₉ so that an expansion upwards and sideways takes place, which has the effect that the passage above the channel ^ the through the tool shaft of the mole plow has been formed, is completely sealed "

The expander can be of any flared shape with its forward end dimensioned to fit snugly in the tunnel previously formed by the plow and should be of symmetrical, substantially circular cross-section over its full length and free be made rotatable without disturbing its effective depth below ground level »For example, the _{expander bsw e} expander can take the form of a

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simple truncated cone of a straight cone or a bell or a series of truncated cones or bells of successive ones increasing cross-sectional size with or without in between located cylindrical sections have “The expander or «Expander can be provided with longitudinal grooves instead of purely circular Be cross-section »

In practice, it is desirable _e to use the same mole plow for laying pipes of various large, in which case the expander size wird- chosen in adaptation to the particular use case Eweckmässig the expander is fcwei parts formed of which the larger rear end portion of the! "orderen end portion _P! be separated for example by a bayonet connection _£. ksnn ₈ so that rear end parts depending on the size of the can be attached pipe to be laid by various large ^

The practice of the invention can be done in various ways _9, however, a particular embodiment is hereinafter referred to, for example, described in more detail in conjunction with the accompanying drawings showing namely;

1 shows a side view in section of a pipe laying device with a mole plow and an expander}

Figo 2 shows a single representation, which the expander and the

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pipe connected to this, as used in Figol, rises;

a perspective schematic view one on top of one Trailer stored sludge container with which the in Fig. 1 illustrated mole plow is connected;

4 is a schematic representation _t showing the valve and pump circuit for the container;

Fig. 5 is a perspective view of a modified embodiment shape of the. expander, the rear end of which is removable?

. Figo 6 is a view similar to Figure 1 of a modified embodiment of the device bearing the erfindungsgcmässen in FIG _e S two-part expander;

FIG. 7 shows a view similar to FIG. 1 of a further embodiment the facility with a drum mixer and

Figure 8 is a view similar to Figure 1 modified for use an expander which is towed by a rope after the mole plow has made its initial tunnel forming pass

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The first embodiment is a mole plow 10 having a Cutting edge 11 arranged at the foot of a plow iron 12 on which a rigid slurry feed pipe 13 is attached substantially vertically its rear edge is attached, the lower end of which has a flexible connection leads to a rearwardly directed tube which is attached to an expander 15, which immediately is towed behind the mole plow, which pipe 14 communicates with a channel 16 within the expander 15, which is formed by a simple, rigid, widening part of a substantially frustoconical outer shape and is connected by means of an articulated linkage 18 at its nose with the rear end of the cutting edge 11, which linkage 18 one up and down movement as well as lateral pivoting movements of the towed expander 15 allows «The expander 15 has a short extension of cylindrical shape 17, which extends rearwardly from its rear end and within which the front end of a continuous length a plastic pipe 24 is arranged, the detachable The manner in which the tube 24 is connected to the expander is shown in Figures 2 and 6 »

As can be seen from Figo 2, the front end of the plastic pipe is 24 fastened by a bolt 25 which is guided through transverse bores in a kuraen cylindrical pipe section 26, the is arranged within the end of the tube 24, wherein the Pipe section 26 has a coarse fit in the bore of the pipe and on

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its front end is closed and further with it front extending tabs 27 is provided, to which corresponding tabs 28 are attached, which cooperate with a detachable hook which is attached to the expander 15. A wad 29 made of foam rubber is under pressure between the links and the end of the tube 24 and has the task of preventing that liquid sludge enters the pipe 24 or in the barrier and release mechanism of the detachable hook · The details of the detachable hook are shown in Flg. 6 and are described below

The upper end of the feed pipe attached to the plow iron 12 13 is connected by a hose 27 to a container 30 mounted on a trailer, which container 30 is shown in FIGS is and with a displacement pump 31 in the form of a screw conveyor! is provided ^ with the delivery outlet of the hose 27 is connected is.

The container 30, the lower part of which has a V-shaped cross-section, is filled with a slurry of bentonite and water in the form of a thixotropic mass 32, which is fed along the tube 27 and down through the slurry pipe 13 and then through the can be pumped tube 14 and the channel 16 into the expander 15 as well as around the Schaumstoffpropfen 29 and into a soil by the passage of the newly formed in Figure 2 illustrated _a plow tunnel 33 "As is clear from Figo 3 and 4,

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becomes the Ben tons t = sludge from the lowest part of the V ° £ 3rmigen The bottom of the container 30 is pumped by the pump 31 and then under pressure via a slide valve 34 to a feed pipe 35 * which, "as shown in Figo 3, via a T-connection with a cross tube 36 connects ^ soft alternately Infeed points on the left or right below the container frame hate The tube 27 is connected to one of the guide points and a cap 37 is not in use End of funding put on =

A bypass return line 38 connects the outlet from the pump 31 back to the container 30 over? a shut-off valve 39 _f , which returns to a pipe 40 _& which extends through the interior of the container " SO, and includes the same two pairs of nozzles 41 of small diameter directed towards the front for the exit of the nurse into the container swrüek carries _f . Above 'the return line 38 EIA pressure regulating valve is provided in a second bypass line 43 4-2 _e we & hes Druekreg ©! "= Valve controlled by weights 44

Initially turn mixing the slurries of the container 30 is filled with water irnd the pump 31 is set open, return "line valve 39.and closed Euführungsventil 34 in transition, se that the entire pump delivery via the return = ftihrdüsen * 41 back to the reservoir 30 «Then Benfccmit-PulYer:? Ugesetit ₆ until the desired consistency is reached

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isto With appropriately set weights 44 is the return valve 39 closed so that the circulation of the sludge over the pressure control valve 42 is returned to the container 30. The slurry can then be fed to the hose 27 and to the Expander 15 can be withdrawn by opening the supply valve 34 «,

The feed pressure is determined by the weights 44 of the pressure control valve 42 and the volume of sludge that is fed underground depends on the speed of the plow and the size of the tunnel 3 and is in practice always less than the pumping capacity of the pump * so that excess sludge over the Drackrege! is valve recycled 42 to the container 30 "the return nozzle 41, cause that the recirculated sludge the mass of the bentonite slurry shares a stirring motion with" in the container, so that they are "as it has thixotropic properties, liquid üeibt _p as long as they was in circulation

The container 30 can be mounted on a trailer ₈ so that it is pulled by the mole plow, or it can be arranged on the mole plow itself.

In use, the cutting edge 11 and the rigid plow iron 12 are pulled through the ground by means of a tractor or winch to which the mole plow 10 is coupled, the. Cut at a graduated depth of perhaps 60 cm (2 feet) to form its tunnel 33 runs. The expander 15 and that

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The front end of the pipe 24 attached to this is dragged immediately behind the advancing cutting edge 11, the expander 15 expanding the tunnel upwards and to the sides by compressing the soil structure, whereby the channel formed above the plow iron 12 is closed, whereby the bottom wall of the tunnel due to the expander articulation 18 remains essentially non-stored, which enables an angular freedom of the expander is _a bentonite mud is continuously via the hose 27 and the feed pipe is pumped through the expander 15 13 so that the slurry of around the front end Pipe 24 passes around to occupy the annular space 38 between the circumference of the pipe 24 and the wall of the expanded tunnel _a so that the pipe length 24 behind the expander 15 through a layer of bentonite ^ sludge with a minimum thickness of perhaps 12.5 mm (1 / 2 ") is dragged below the pipe, which layer is above and around the pipe This layer of slurry surrounding the pipe 24 acts as a lubricant to reduce the frictional resistance, as already described «

In an alternative in Figure "5 and 6 embodiment ά & τ inventive device is a two-part expander 50 is used, whose wider part Sl is removable at the rear end so that it replaced with larger or smaller end parts depending on the size of the pipe to be laid 24 can be «, the removable rear part 51 of the expander can

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in the front nose part 52 of a bayonet connection by means of protruding noses 53 on a tubular shaft 54 = which the latter is a common size for all Expander has., The tabs inserted through slots 54 which are provided in the nose part 52, for what purpose the rear part 51 is slightly rotated and secured by a suitable locking bolt, not shown «

After the pipe-laying work has been completed, it is advisable to release the pipe underground at a special point without having to dig a hole around the mole plow, for which purpose a detachable hook is provided, as shown in Fig and can be engaged with a bolt attached to the tabs 23 (see Figo 2) connected to the end of the tube 24 with the hook 60 in the? Pulling position is secured by a spring-loaded retractable bolt 51 and is loaded in its release position by a spring 62 At the end of the laying work, the hook 60 is opened by pulling the locking bolt 61 back * by pulling a rope 63 attached to it , which rope passed around a pulley 64 in the plow and the plow iron up above the ground level istο on hooks 60 is a toggle lever 65 _v to be used for the initial fastening of the end of the tube provided .. 24 »

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Fig. 7 shows a further modification of the eggshell according to the invention: ht'a & g liiit © χΒώηι meclißniseh & agetr-i @ b © nesi. rotatable Mis rather 70j, d & i ηηΐΆ? * %% Ζϊ. && τ hintat a siach rÜKÄwSfis »© delivery © th nozzle 71 supported eat« through which the --Sshlasime is brought to exit tvlrdp whereby the mixer is driven by a force-driven © TigimisI ge «°
forms _c the ysdial protruding teeth _P through which the newly protruding sludge in ai® surface layer of the
the WaiAd of the tumtsis-forming soil is mixed in. In this case, the SskXämiacf SZ is preferred by © in mixture && ξ
Bsntonite alone with. Water formed _e so "that- keiii soil in
the sludge is ve ^ haadsn, or is pumped down by the plow-iron ο -When * "no mechanical mixture? But wiid ^ kami uses a portion of the oath material from the tube in the container 2 around the hardening pumps in the tunnel

In a modified embodiment. bsw _P a modified one
Procedure »which is divided into Figo S ₉ the mole flight leads first of all an initial tunnel opening passage sms, during
welehera the expander 'and the pipe 24 at the entry point of the tunnel 33 .gsl & ssen ^ whereupon expander and' the 'pipe 24
be sucked by a wind © along the tunnel 33 "

In this case, the plow iron 80 has an inner channel 81 that serves as a rearwardly directed circular nozzle 82
led and d @ r Blander 83 is replaced by a simple rigid _c .

■ see eip%? Sit @ rjffi4i®ix ^ © hrförstigen bleeh part of conical cone-shaped

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Shape formed, which has a length of about 2.45 m and is formed with a series of openings 84 in its wall and with a central opening 8S on its nose, is attached to its nose at the rear end of a tow 19 by means of a swivel joint 86 which is connected to the mole plow o The rear © diameter of the plow is 20 cm (8 ") and the diameter of the front end of the expander is about the same, while at its rear end the expander constricts · diameter of 60 cm (24") has ₀

At the end of a towing cable 88 (the practical the same © rope as 60 can be used to dissolve the hook shown in Figo 6 ₈ when the same mole plow for this Äusführungs-sw ;. shape used%> _ϊτά ϋ is the front end of a. Rohrschleppsiänge 89 attached. at its rear end the Schleppstfinge BB is formed by a © Sdmellösekupplung 90 * at the forward end © © 1 "© τ k © ati ° auies" Xieh®Ji h length of the tube 24 of about 100 m isai "e & jsea Durchraess © The tow bar 80 '. ". extends through the interior of the conical expander 33 from its ¥ © 7d © r @ m end © and the tendon release coupling iO is immediately inside the rear end of the Expander S3 -, arranged »The towing rope 88 is led from the expander 83 forward to a rope pulley 91 in the foot of the hollow plow iron 80 of the mole plow, from where it goes up through the plow iron and around a second pulley 92 above the ground level m a winch, not shown, extended the a free one

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Has winding drum on which the rope is stored we do

In use, the plow makes an initial tunnel digging pass at a stepped depth of about 60 cm (2 feet) to form a tunnel 33 initially 20 cm (8 ") diameter which will be filled with Bentonite Slurry 32, which is pumped down through the plow iron channel 81 when the tunnel is formed by the passage of the plow «, Der Expander 83 and pipe 24 are left at the entry point of tunnel 33 and during the forward movement of the Plow gives out the rope winding drum, which through the plow iron 80 is guided to miteii o If the mole * plow the leading end of the required pipe length, reached, it is brought to a standstill and the full power of the tractor or winch motor is transferred to the Cable winch exercised to wind up the pipe tow rope and the expander 83 and the Rohrläsige 24 through the slurry-filled underground tunnel 30 in the required end position to pull the pipe length. This pipe redrawing process is very rapid and when the expander 83 is pulled along the slurry-filled tunnel 33 it expands it to one About 50 cm (about 24 ") in diameter, with something clever» 32 is pressed into the tunnel wall · The widening of the tunnel also occurs through an upward and sideways compression the mud-impregnated soil structure and the pipe 24 rests;

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when it is pulled into the mud-filled tunnel 33 behind the plow, immediately on this undisturbed mud-impregnated floor of the tunnel in its certain inclination. The previously pumped into the interior of the tunnel 33 before the advancing towed expander 33 slurry 32 occurs around the nose opening 85 of the expander around and through and receives the annular space between the periphery of the tube 24 and the wall of the widened tunnel, a ₀

During this process, either the correct amount of bentonite slurry SZ _t that is required to fill the annulus around the pipe 24 is measured out and introduced into the tunnel 33 before the pipe is dragged into it, with the sludge being pushed back through the plowshares channel 81 is changed when towing the tube through the Schllessen the shutoff valve 34 verhin · _'s ode? The tunnel 33 is first completely filled with the sludge and the pipe 24 is then dragged into the filled clay "with excess sludge being pushed up through the line 81 and the hose 27 into the container by the back pressure, which is caused by the Vorwärisbswegung of the tube and the expander, wherein the .. shut-off valve 34 is opened and the pressure-loaded Entspannung® * »valve 42 remains in operation to this flowing back to. understandable and to regulate _o

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The use of the expander 83 makes the retention easier despite the inclination of the pipe 24 by using the undisturbed floor area of the tunnel 33 as a reference line for the inclination the considerable distance between the entry point for the pipe pulling and the foot of the mole plow, which previously this Reference line determined,

Although in the above-described and illustrated arrangement the pipe towing rod 89 is attached to the main towing rope 92 and the expander 83 can be freely pivoted in any direction independently of the pipe 24, it is also possible, if necessary, to use the pipe tension to make the expander 83 a small loading force in its centered position mitsuteileno This can be done in that the front end of the tubular tow bar 83 is rigidly attached to the front end of the expander 83 s itself ₈ for example with the help of a spoke star or other suitable intermediate piece, and a joint in the Rolir tow bar 89 in a short Provide a distance of, for example, S cm (2 ") behind the connection to the expander

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Claims (1)

DA ~ 3196 P at β η ta nsnruche; VI ₀ ! A method for laying underground pipes, for example drainage pipes, in which an underground tunnel is formed by a mole plow and a length of pipe is sucked into the tunnel into its required end position, characterized in that "a liquid sludge made of clay or cement or earth or a mixture of two or msh "the same further with or without further constituent components reren similar SchlSrarae or" the as w usually wird® used in earth drilling in the formed by the plow tunnel injected! f <ä _D the Rohrläng © is pulled into the tunnel, what © S "serves" the tube during its movement along the tunnel to §dimie? s _e 2ο method according to claim 1, characterized in »that the sole bsw "main component of Schlänae bentonite 1st. 3 "Method according to claim 2, characterized in Saß dl® Sludge made from a mixture of bentonite and water would d & § © in gel with thixotropon Bigensch @ .ft @ n 909883/0355 »20- DA-3196 and that the mud down into the tunnel through a Positive displacement pump is being pumped " 4ο The method according to claim 2, characterized in that the Sludge is produced as a mixture of bentonite and soil in the water and either the mixture is mixed before it is supplied or a mixture of bentonite and water is conveyed separately into the tunnel and in this at place and Place is mixed with the fuel of the tunnel wall by means of a mechanical underground mixer £, which is behind the Plow being towed, & _e method according to claim 2> characterized in that the sludge is produced as a mixture of beatonite and cement in water ο Method according to the preceding claims, characterized in that the length of the pipe is dragged behind the plow, which is moving forward, so that the pipe sits . advancing into the üinnöl vitarend the formation of desgelfeiss “woe the plow, g © ssg®a will _ö w © b @ i the plow is en'mit © in © si..Ksnal is provided“ through which the mud © to unt @ m in & ®n esum in front of the front end® of the pipe and around the circumference of the tunnel 9 09883/0355 »21 · DA-3196 being pumped around =, 7 "The method according to claim 6, characterized in that a Expander of a substantially flared shape at its narrower end on the plow just in front of the length of pipe and is towed through the tunnel together with the length of pipe to widen the tunnel before the Main part of the pipe length in this entry « 8ο The method according to claim 7 _a, characterized in that the front end of the pipe is connected to the expander by an Ids »baren hook, which can be released by a release device, which is arranged above the ground level, so that at the end of the pipe laying work the pipe can be detached from the plow in the subsoil «, 9β Method according to claims 1-5, characterized in that » that first a full length of an underground tunnel @ ls is formed by a pass of the mole plow, di @ Sludge down through a channel in the P £ l @ g @ £ sen- and in the tunnel behind the plow so © ing © lsit @ t wird® the tunnel is completely felled, and evidence has finished its run, © in # Rehrlängge in 9 098 8-37 03 -23- DA-3I96 filled tunnel is pulled by a rope and a winch. 1Oo method according to claim 6, characterized in that an expander of essentially expanding, hollow shape articulated at its narrower end on the pipe pulling rope immediately in front of the pipe length and together through the tunnel is dragged with the pipe length so that the newly formed and slurry-filled tunnel is widened before the Main part of the pipe length enters this ο IJU method according to the preceding claims, characterized labeled in · £ eielm © t _s that the front end of the tube is closed by a plug (29) sue elastic material while the tunnel is pulled along, ma ingress of slurry into the pipe essential to prevent _α IZ _n device for laying underground pipes, for example drainage pipes, characterized by a mole plow ClO) for forming an underground tunnel, a® device (13) which is assigned to the plow and serves to inject liquid sludge into the tunnel to be formed by the plow - "23- 9098 83/03 5 5 spray, and means for pulling a length of pipe into the slurry-filled tunnel _{or the like} 13. Device according to claim 12, characterized by means, which connect the pipe and the mole plow together, advancing around the pipe immediately behind the plow pull into the Imine1 su, while the latter through the Plow shaped ο Device according to claim 13 ₉ characterized by a 33Spand © r (15) of see generally widening. , FoffBt _e . which can be attached to the narrower end of the plow directly ψ @ τ u <bt Rohrläng © « ο device according to claim 14, characterized the expander is provided with a detachable hook (60) _e that serves ₉ the front end of the tube with dlemm. to be connected ₈ and which are released by a release element (63) which is arranged above ground level «, 16ο device make claim 15, characterized in that d © 7 detachable hooks with a spring-loaded® »Hsken (60) ge« 24 «9 0 9883/035 5 e> V Ae DA-3196 forms ,, is connecting in the closed position of the pipe to the expander and BSW in the closed position by a bolt _e latch is held (61) which can be retracted to release the hook by means of a rope, which respectively with the bolt .. bolt connected and extended to above ground level 3.7 ο Device according to claims 14 «=> 16, characterized in that the expander is formed from two parts (Sl ₉ 52) ₈ of which the larger rear end part (Sl) can be removed from the front nose part (52)« 18. Device according to claim 12, characterized in that a rope is provided with a winch through which the length of pipe is pulled into the slurry-filled tunnel after the plow has finished its run. 19β device according to claim 18, characterized by a Expander (83) of substantially expanding shape, which has at least one »channel (84) for the flow of slurry is provided by this, which expander at its narrower end by the pipe tow rope (88) directly can be attached in front of the pipe » 909883/0355 «25- L .. *. It.