DE3105916A1 - Pipe-pushing apparatus - Google Patents

Abstract

The invention relates to a pipe-pushing apparatus for inaccessible pipes, with a cutting head which can be pivoted by means of hydraulic control cylinders and a hydraulic flushing device for removing the soil material. According to the invention, the interior space of the cutting head (11) is covered towards the face by a deflector (33) which is designed like a grating and preferably like a conical basket or the like which is formed by a multiplicity of roughly radial ribs (34) distributed over the pipe periphery and having passages (41) in between. The arrangement of the deflector (33) and the end opening of the cutting head prevents the ingress of rock obstacles (erratic blocks) into the cutting head during the pipe-pushing operation. Rock obstacles can be flushed free to such an extent that they are pushed away to the side during the pushing of the pipe line. The cutting head (11) with its deflector (33) is preferably arranged in a pivotable manner on a trailing pipe which consists of several pipe sections (13 to 16), which are locked against rotation but can be angled towards one another to a limited extent, in order to permit directional control during the pushing of the line. <IMAGE>

Description

Title: Rohrvorpreßeinrichtung

The invention relates to a pipe pre-press device for press fitting a pipeline into the ground with a cutting head, which by means of hydraulic Control cylinder is pivoting range, and with a hydraulic flushing device for Removal of the soil material.

Are pipes of smaller diameter from e.g. 500 to 700mm over larger ones Distances ii soil pre-pressed, there is a risk that the at the front At the end of the pipeline to be pre-pressed, the Sohneidkopf through the pre-press path Lying rock obstacles or when pressing through soil formations of different hardness is deflected from the course of the direction. A precise pre-pressing of such inaccessible Pipelines over longer distances of at least 50 to 100 a were previously in such cases are not possible.

In a known Rohrvorpreßeinrichtung of the aforementioned type consists the cutting head consists of two pipe sections, of which the rear pipe section is rigidly connected to the pipeline to be pressed, while the front, with a tube section provided with a cutting edge on all sides limited angularly movable on the rear Pipe section is arranged and sealed to the rear by means of a Schottvasd (DE-PS 11 73 034). The two pipe sections of the cutting head are hydraulic Control presses connected0 to Monitoring of the pre-compression direction is Provided in the Schneidkonf a locating device with an electrical display device connected in a remote control stand.

In this known Rohrvorpreßeinrichtung the Sptlleitung is for the removal of the soil-water mixture from the rinsing chamber on the chest in in the middle of the pipe, with jet nozzles on the bulkhead around the flushing line are arranged for loosening the soil. If there are rock inclusions on the pre-pressing section, E.g. boulders and the like are encountered, there is a risk of clogging the flushing line and, if necessary. also sticking of the cutting head.

Also known is a RohrvorDreßeinrichtung used for the pre-pressing small, non-walkable Ro »is intended and a hydraulic one in the cutting head Milling device and a hydraulic flushing device are arranged with which the loosened soil is hydraulically conveyed away through the pipe to be pre-pressed (DE-GM 79 22 756).

The object of the invention is to provide a RohrvorpreBeinrichtung the aforementioned Type that is preferred for pre-pressing non-accessible pipes of less than 1000 mm, e.g. from 500 to 700 mm, is to be designed in such a way that a directionally accurate Pre-compression of the pipeline without the risk of the flushing line clogging and seizing of the pipe is also possible if there are rock obstacles on the pre-pressing section, E.g. erratic boulders or the like, are found mainly in sandy soils are.

This object is achieved according to the invention in that the interior of the cutting head towards the face by a grate-like structure Deflector is covered.

The arrangement of the deflector designed in the manner of a sieve grate at the front opening of the cutting head prevents rock obstacles from being introduced, e.g. boulders, in the cutting corpus and its rinsing chamber beX pipe pre-pressing process. The use of the deflector in connection with the hydraulic flushing conveyor enables it to unwind such rock obstacles so far that they are pressed when the Pipeline can be pushed away to the side5 This prevents the pipe to be pre-pressed and a clogging of the hydraulic discharge line reliably avoided. With regard to the deflector function of the screen formed by the grate As a deflector, it is recommended that the latter be inclined at an acute angle to the propulsion axis to be arranged on the cutting head. In this case, the deflector is preferably in the manner of a conical or frustoconical basket, which is expediently formed by a Large number of distributed over the circumference of the pipe and against each other towards the face converging, roughly radial ribs with through-channels in between is formed for the soil material. The through channels of the deflector will be like this dimensioned so that only such lumpy soil material can get into the oil chamber, which can also be reliably conveyed away. To avoid blockages of the passage channels To avoid this, the through channels of the deflector are advantageously designed in such a way that that it extends from its end on the face of the building to the end on the pipe side, preferably conical, widen.

In the case of a conical deflector, its cone axis preferably with the pipe or jacking axis coincides, the ribs forming the cage become expediently arranged between an outer ring or tube and a central inner tube. The entire deflector can be mounted on the cutting board in an easily detachable manner. Furthermore can it is advisable to move the deflector opposite the cutting head in the direction of the face and to be arranged movable in the opposite direction. This mobility can be used for this purpose by the amount by which the deflector on the face side over the cutting mud advocates to change and thus the controllability of the cutting confection by reducing it to improve the protrusion of the deflector compared to the cutting head, at the same time or instead, the aforementioned deflector movement can also be used to the loosening of lumpy soil material that is in the through channels of the Abweisers has established to support.

It is also advisable to use the cutting head or its built-in parts or to be arranged on the deflector spray nozzles in order to loosen the soil material on the To support the face and / or the flushing process as well as the flushing of the deflector. The spray nozzles can be movably arranged, for example pivotably so that there is a vortex effect favoring the flushing process.

The deflector is expediently arranged in front of a bulkhead that On the face side, a rinsing chamber in the cutting head separates and through which a water supply line for the rinsing water supply and a discharge line for the removal of the soil material 0 It is advisable to place the water supply pipe centrally on the bulkhead to be arranged while the discharge line for the soil-water mixture expediently in The bottom area of the bulkhead is located via the water supply line into the rinsing chamber Escaping flushing water can reach the face via the through channels of the deflector where it unfolds its flushing and dissolving effect. The one in the rinsing chamber The water-soil mixture can at the same time via the discharge line arranged in the bottom area 0 In order to deposit the soil material, especially during downtimes in the discharge line and thus blockages this line too avoid the water supply pipe and the discharge pipe in the area their front ends are short-circuited by a line connection, so that the discharge line can be rinsed with fresh water. There is also the possibility to cause a flushing of the discharge line by alternately is switched to sucking and pressing.

With the embodiment of the pipe pre-stressing device according to the invention the precise direction of pipe pre-pressing is favored, especially in sandy soils and prevents the pipe from seizing up. In terms of directional controllability of the pipe pre-press device, it is recommended to use the hydraulic To arrange the control cylinder pivotably on a follower pipe, which consists of several rotatably, but limited against each other angled pipe sections consists. the Pipe sections are preferably via pin joints lying diametrically opposite one another connected, the radial hinge pins enclose in elongated holes that extend in the direction extend the pipe axis. For the pre-pressing of the inaccessible Monitoring and control devices of the known type can also be used in the pipeline are used, the z0B. work with a laser beam as a guide beam.

The monitoring and control of the pipe pre-reaming device can be carried out here take place from a central point located outside the pipe. As the pipe sections of the follower pipe are rotatably connected with respect to the pipe axis, the disadvantageous rolling movements of the entire propulsion confection avoided. For the water supply and the removal of the soil material, flexible hoses are preferably used, which swivel movements required to carry out direction corrections do not interfere with the pipe sections and the cutting head.

The invention is described below in connection with that in the drawing illustrated embodiment explained in more detail. In the drawing: Fig. 1 a pipe pre-pressing device according to the invention in the region of its front end in Longitudinal section; Fig. 2, also in longitudinal section and on a larger scale, the cutting head the Rohrvorpreßeinrichtung of Figure 1; Fig. 3 is a view in the direction of the arrow III of Fig. 2; FIG. 4 shows a cross section along line IV-IV of FIG. 1; Fig. 5 a single deflector rib in longitudinal section.

In Fig. 1, 10 is the front end of a to be pressed in the ground Pipeline which consists of individual pipe sections, e.g. steel pipes, with a Diameter of e.g. 500 to 700 mm. The pipeline is pre-pressed in the known way by means of one at the rear end of the line in an excavation arranged (not shown) prepressing station, where the individual pipe sections in the course of Vororeßarbeit to the rear end of the already vorgenreßten pipe string be connected. At the front end of the pipeline 10 vorzuoressenden is a Steering and cutting device arranged. This consists of a front cutting conf 11 and one lying between the cutting head 11 and the front end of the pipeline Follower pipe 12, which in the illustrated embodiment, four behind-the-counter-switched Having pipe sections 13, 14, 15 and 16, the pipe 10 carries on its front End of a kayees connection pipe 17 with a diameter offset Kohrstutzen 18 which grasps in the rear end of the pipe section 16 and here by means of a circumferential Seal 19 is sealed. The pipe section 16 is connected to the connecting pipe 17 in Rotationally fixed with respect to the common pipe axis, but angularly movable to a limited extent on all sides tied together. This is done by means of diametrically opposed pin joints radial hinge pins 20 in elongated holes 21 of a stepped ring part 18 'of the pipe socket 18 surround, the longitudinal axis of which runs in the direction of the pipe axis. The pipe section 16 is accordingly pivotable about the axis of the two hinge pins 20, that is to say horizontally and at the same time due to the play of movement of the bolts 20 in the elongated holes 21 vertically pivotally connected to the connecting pipe 17, the horizontal pivoting movement is limited by stops 22. The pin joints are protected inside of the pipes next to the seal 19.

The pipe sections 13 forming the multi-section follower pipe 12 to 16 are connected to one another via corresponding pin joints 20, 21. Because of this multiple subdivision of the follower pipe 12 into individual, articulated connected Pipe Sections is a good directional controllability when pre-pressing the pipeline 10 given.

The cutting head 11 is without the use of the aforementioned pin joints Slightly pivotable on all sides at the front end of the pipe section 13 of the follower pipe 12 arranged. The pipe section 13 has a stepped diameter, with radial play in the rear end of the tubular cutting head 11 bordering tubular part 23, which carries a seal 24 sealing the two tubes on the inside. It exists but also the possibility of cutting the kotf 11 via corresponding pin joints 20, 21 to be connected to the pipe part 13. On the pipe part 23 are in joints 25 several, in the present case four hydraulic light presses distributed over the circumference 26 connected, their piston rods 27 via articulated connections 28 are connected to the cutting head. The tax wires 26 are accordingly inside of the cutting head; they are designed as double-acting hydraulic cylinders, those for carrying out direction corrections separately or jointly hydraulically can be acted upon.

A bulkhead 29 is provided in the front area of the cutting jar 11, the face side a rinsing chamber 30 opposite the follower pipe 12 and the transport line 10 seals. In the pipeline 10 and the follower pipe 12 are two as flexible Hoses formed lines 31 and 32 laid, of which the line 31 one Pressurized water supply line and the line 32 is a suction or discharge line forms. The line 31 opens in the middle of the pipe in the bulkhead 29, while the Line 32 is connected to bulkhead 29 in the bottom area.

The cutting head 11 has at its front end on the chest side at a distance in front of the bulkhead 29 on a deflector 33, which is in the manner of a conical Basket or grate is formed. The deflector 33 consists according to FIGS. 1 to 3 of a plurality of distributed over the pipe circumference of the cutting head 11 and towards the face towards each other converging approximately radial grooves 34, which of strong plates are formed and between a central inner tube 35 and the outer circumference of a support ring 36 are attached by welding. Individual ribs 34 are angled from the radial plane according to FIG. 3 and in the angled area Supported against the support ring 36 via short intermediate steps 37. Be that way formed between the ribs 34 and 37 through channels 41, which over the entire have approximately the same gap width and which extend towards the inner tube 35 taper conically. As indicated by dash-dotted lines at 34 'in FIG. 3 is, at least one intermediate ring coaxial to the pipe axis can be provided which the through channels 41 formed by the ribs 34 in the area between the inner tube 35 and the outer ring 36 divided and thereby prevents smooth rock can get into the passage channels 34. The deflector 33 accordingly forms a Sieve basket or a strong conical grate that prevents the penetration of larger rocks in the washing chamber 30 prevented. To prevent rocks from settling in the To prevent through channels 41 forming rust openings, it is recommended that the Ribs 34, 37 and possibly.

also to configure the intermediate ring 34 'conically, as shown in FIG. 5, in such a way that that the passage channels 41 from the face side to the side of the flushing chamber expand conically.

The entire deflector 33 is expediently detachably attached to the cutting head 13. This can be done with the help of radial tabs 39 on individual intermediate ribs 37 are attached and are fixed to the jacket of the cutting head 11 by means of screws 38 let (Fig. 2 and 3).

The ribs 34 forming the conical deflector 33 are at their front, the ends protruding towards the face according to FIGS. 1 and 2 beveled in a roof shape, wherein the inclined surfaces 34 ?? converge in a rounded tip 40, which in the pipe axis lies. The inner tube 35 is pulled forward up to this tip 40 and rounded accordingly. As mentioned, the through channels lie between the ribs 34, 37 41 for the rinsing water introduced under pressure into the rinsing chamber 30 and for the Passage of the soil material.

As indicated in Fig. 2, inside the cutting head 11, i. in the rinsing chamber 30 with high pressure water operated jet nozzles 50 are provided, the nozzle jets of which are expediently directed against the channels 34, 37 are. The jet nozzles 50 can on the cylindrical inner wall of the Abweiserkonf forming pipe, on the bulkhead 29 and / or on the parts of the deflector itself to be ordered. At least some of the jet nozzles are preferably pivotable arranged to achieve a certain vortex effect in the washing chamber and / or to improve the rinsing effect.

During operation, flushing water is in via the water supply line 31 the flushing chamber 30 and pressed from here via the passage channels 41 to the face, around the soil material on the face, if it does not fall into the rinsing chamber flows to release. At the same time, the soil-water mixture is about the The discharge line 32 is withdrawn from the washing chamber 30 in the bottom area. Rock obstacles, E.g. boulders or the like, which are in the pre-pressing path, are by the Tube axis towards the tube circumference wedge-shaped inclined ribs 34, 37 outwards from the Vorpreßweg pressed so that they do not hinder the Vorreßbetrieb and not get into the washing chamber 30 and can clog the discharge line 32 here. The dismantling of the soil material on the face can be assisted by the jet nozzles 50 will.

The control of the Rohrvorpreßeinrichtung can be known per se Way with the help of a guide beam aligned in the pre-pressing direction, in particular a laser beam 42 are effected. It is at the front end of the pipe section 13 of the follower pipe on a console 43 a target device 44 with a crosshair or

Like. Arranged. The console 43 also carries monitoring devices 45 and 46 for a pressure display and a displacement display of the control presses 26. The Transmission of the measured values to a rear operator station takes place by means of a Fernsehkaiera 47, which is in the front pipe section 13 of the Follower pipe is arranged.

The lines 31 and 32 consist, as mentioned, of hoses that can be connected by means of quick couplings 48 and extended if necessary. In order to avoid blockages of the line 32, especially during business interruptions can avoid the lines 31 and 32 in their front area But a line connection 52 (Fig. 2) are short-circuited, so that the delivery line 32 by means of fresh water can be flushed through, which is supplied via the lines 31. During the normal conveying operation, the line connection 52 by a (not shown) Shut off valve. The arrangement can also be made so that the The discharge line 32 can be flushed free by alternately sucking and pressing. The line connection 52 could also be made from a pipe connector arranged adjustably on the bulkhead 29 exist from a position in which the two lines 31 and 32 with expose their mouths relative to the washing chamber 30, in an operating position can move or pivot in which he the lines 31 and 32 at their mouths connects.

In order to avoid oversteering when controlling the direction, the Arrangement can also be made so that the articulations 20, 21 of the Allow pipes 13 to 16 forming back-up runners to stiffen. Furthermore there is the possibility to arrange the entire deflector 33 so that it is opposite the tubular cutting head 11 can be moved in the direction of advance and in the opposite direction. By driving back of the deflector 33 in the cutting head 11, the controllability of the device The mentioned adjusting movements can also be used to the To favor deflector effect and / or any stuck Loosen rocks.

L e r s e i t e

Claims (17)

Title: Rohrvorpreßeinrichtung AnJ? Rüche 1. Rohrvorpreßeinrichtung for pressing a pipeline into the ground with a cutting head, which by means of hydraulic control cylinder is pivotable, and with a hydraulic flushing device for the removal of the soil material that the interior of the cutting head (11) towards the face by a according to Art a grate trained deflector (33) is covered. 2. Device according to claim 1, d a d u r c h g e -k e n n z e i c h n e t that the deflector (33) is inclined at an acute angle to the propulsion axis. 3. Device according to claim 1 or 2, d a d u r c h g e k e n n z e i c h n e t that the deflector (33) is designed in the manner of a conical basket is. 4 Device according to claim 3, d a d u r c h g e -k e n n z e i c h n e t that the conical deflector (33) of a multitude of over the ttohrum-pang distributed approximately radial grooves (34) with through-channels (41) in between is formed0 5. Device according to claim 4, d a d u r c h g e -k e n n n z e i c h n e t that the front edges (34 ") of the channels (34) are roof-shaped formed and converge in a projecting apex surface (40). 6. Device according to claim 4 or 5, d a d u r c h g e k e n n z e i c h n e t that the ribs (34) between the inner wall of the tubular cutting head (11) and a central inner tube (35) are arranged. 70 Device according to one of claims 1 to 6, d a -d u r c h g it is not shown that the deflector (33) opposite the cutting head (11) is movable in the direction of the face and in the opposite direction. 8. Device according to one of claims 1 to 7, d a -d u r c h g It is not noted that the deflector (33) is arranged in front of a bulkhead (29) is, which on the face side a SnUlksmmer (30) in the cutting head (11) separates and through one water supply line (31) for the flushing water supply and one discharge line Pass (32) through for the removal of the soil material0 9. Set up after Claim 8, that the water supply line (31) is connected centrally to the bulkhead (29), while the discharge line (32) lies in the bottom area of the bulkhead. 10. Device according to claim 8 or 9, d a d u r c h g e k e n n indicates that the water supply line (31) and the discharge line (32) consist of flexible hoses. 11. Device according to one of claims 1 to 10, d a -d u r c h it is not noted that the deflector (33) is detachable on the cutting head! (11) arranged is. 12. Device according to one of claims 1 to 11, d a -d u r c h it is not indicated that the through channels (41) of the deflector (33) from its end on the face of the building to the end on the pipe side, 13. Establishment according to one of claims 1 to 12, d a -d u r c h g e k e n n z e i c h n e t, that on the cutting head (11) and / or on the deflector (33) spray nozzles (50), preferably are arranged pivotably. 14. Device according to one of claims 1 to 13, d a -d u r c h it is not noted that the water supply line (31) and the discharge line (32) can be short-circuited in the region of their front ends by a line connection (52) are. 15. Device according to one of claims 1 to 14, d a -d u r c h it is noted that the cutting confection (11) by means of the hydraulic The control cylinder (26) is pivotably arranged on a follower pipe (12), which consists of several non-rotatable, but limited mutually angled pipe sections (13 to 16) exists. 16. Device according to claim 15, d a d u r c h g e -k e n n z e i c h n e t that the pipe sections (13 to 16) are diametrically opposed to one another Pin joints are connected, the radial joint pins (20) of which in elongated holes (21) which extend in the direction of the pipe axis. 17. Device according to one of claims 1 to 16, d a -d u r c h it is noted that the control presses (26) in the cutting assembly (11) are behind the bulkhead (29) are arranged, and that in the follower pipe (12) a monitoring device (43, 44, 45) is provided, which can be read by means of a television camera (47).