Device for connecting two abutting casing pipes

The invention refers to a device for connecting two blunt together-pushing casing pipes by into flnchtende throughholes in pairs a casing pipe and a neck other casing pipe of the used, the edges of hole on the inside of the neck and the exterior of the casing pipe with per a head spreading tie bolts, intervening in this casing pipe. Casing pipes are suspended substantial loads, which requires an accordingly loadable connection between the casing pipes with the Aneinandeffügen of the individual casing pipes. Since with this blunt together-pushing Bohrmhren radially outward or liaison vehicles postponing inside are to be avoided unlichst, the casing pipes tiblicherweise are welded with one another, which brings naturally a substantial expenditure of the drill location with itself. In this connection it is to be considered in addition that the casing pipes adjacent by a welded joint must be again separated with their distance from the borehole. In order to be able to avoid welded joints, a rivet joint was already tried, with which the casing pipe became to provide other hole position ear with in intervening, drawn in neck from a welded sheet metal ring, so that in this neck and it to enclosing casing pipe escape-end Durchgangsbohmngen for the admission the connecting rivets be planned could. Unfavorably during such a rivet joint again the work expended is for the production of the rivet joints, which must be broken open for the loosening of the individual casing pipes again. For the solvable connection of blunt together-pushing casing pipes it is in addition admits (DE-AS 2,165,827), to use screw mountings but these pins only into a nut thread of the casing pipe outside within the overlap range by eyes is screwed in and intervenes themselves in a tapering drilling in the range of the neck of the other casing pipe, so that toward the pin axle no course-firm connection between the two tubes can arise. In addition the screw mounting on shearing is stressed, what tubingbe-hired the axial Belasmngsfähigkeit limited. Apart from the fact Gewindebohnmgen must be planned in the casing pipes, what turdichst to avoid isL during another well-known fitting (DE-AS 2,811,723) drillings become in the neck a of the pipe and in the final range this neck of spreading other pipe collets used in escape-end, into which a Spannbolzen is screwed in. A transverse load of the Spannbolzen is avoided by these collets, but remains the load capacity of the collets stressed on shearing limited, because the cases cannot be implemented due to necessary spreading arbitrarily thickly. In addition it comes still that also in this case no sufficient course-firm connection toward the Klemmhñlsenachse zn expect is. The invention is thus the basis the task to avoid these lack and to improve a device in such a way for connecting two blunt together-pushing casing pipes of the initially described kind that this fitting cannot only be solved without destruction, but still another sufficient Belastungst'ähigkeit both in radial and in axial direction exhibits. The invention solves the task posed thereby that one of the two heads of the tie bolts forms a construction unit with a clutch beginning, intervening separated from the pin shank, in a sürnseitige SchaItausnehmung that the loose head of the tie bolts exhibits a nut thread for a connecting bolt interspersing coaxially the pin shank and that the halsseifigen heads of the tie bolts are surrounded by a Schntzkragen planned on the ii-when inside. The replacement of the well-known Verbindnngsnieten by tie bolts with a firm and a loose head, which intervenes with a clutch beginning in an appropriate, stimseiüge Sehaftausnehmung and is held together with the pin shank over this interspersing connecting bolt, permits to impair a non destructive solution of a Rohrverbindnng with such tie bolts without the load capacity of this connection, because the connecting bolt between that cannot be loaded pin detention and the loose head by transverse forces, as they arise with a Axialbevegung of the casing pipes. These the Verbindnngsbolzen on shearing stressing forces are taken up alone by the pin shank, which extends over the thickness of the casing pipe and the neck intervening in this casing pipe. Appropriate forces on the loose head become over the clutch beginning of this head on the pin shank iibertragen, so that the connecting bolt is only stressed on course. In addition because of the Kupplnngsansatzes of the loose head the length of the nut thread for the connecting bolt can be selected independently of the addendum, which permits flat head training. The Zweiteilnng of the tie bolt makes would bring in the tie bolt into in pairs escape-ends throughholes of a side ago and using the loose head from the other side possible, whereby the pin shank can be taken up in the throughholes with sufficient play, in order to be able to adjust with thin-walled casing pipes nnvermeidbare Wandverformnngen. After bolting the pin shank with the loose head the desired connection is manufactured, which also by unscrewing the connecting bolt preferably trained with a Imbuskopf can be drawn. Because of the large load freedom of this connecting bolt results no danger for a devious one the Schranbverbindung, particularly since the heads of the tie bolts on the inside of the casing pipes are surrounded by a protection collar, that prevented that by the casing pipes led construction parts, for example, fasten Bohrgreifer to these heads and stress the tie bolts on thrust. Particularly favourable Konstn äonsverhältnisse results, if the loose heads of the tie bolts No. 389564 are neck-laterally planned, because in this case the connecting bolts of the tubing exterior are betäügbar. Beyond that a simple twist lock for these loose heads of the tie bolts results, as these heads will provide with a flattening parallel to the pin axle, which cooperates with an appropriate thrust ring of the protection collar. The connecting bolt for fastening the loose head with the pin shank can be pivoted from there without difficulties from the outside by the shank into the nut thread of the loose head. In order to receive an effective protection of the neck-lateral heads of the tie bolts from a load by construction parts, which are led by the casing pipes, recommends it see to adapt the thickness of the protection collar to the neck-lateral addendum of the tie bolts. In addition this measure secures a lowest possible radial projection of such a connection. If the protection collars for the neck-lateral heads of the tie bolts in axial direction exhibit running out rejection points, then also the load of the protection collars can be lowered by Bohrgreifer od. such to a minimum, because the Konsm ktionsteile with an appropriate play, led by the casing pipes, is diverted in the casing pipes to intervene and by the rejection points. In the design the invention article is for example represented. Show: Fig. 1 a cross section by with the help of a connecting device according to invention to another casing pipe attached casing pipe, Fig. 2 an axial section after the line (II-II) the Fig. 1 in a larger yardstick and Fig. 3 an interior opinion of this connection within the range of a tie bolt likewise in a larger yardstick. The device for connecting two blunt together-pushing casing pipes (1) and (2) point one in accordance with the represented remark example on the inside a of the casing pipe (2) set, drawn in neck formed by a welded sheet metal ring (3) up, which when joining the two casing pipes (1) and (2) in the other casing pipe (1) intervenes, like this in particular the Fig. 2 to infer is. Both the neck (3) and the casing pipe (1) is with a majority of throughholes distributed over the tubing extent (4) provided, which in the connecting situation of the two casing pipes (1) and (2) in pairs with one another swore, so that in throughholes (4) ever a tie bolt (5) escape-end to be used can, which to a pin shank (6) with a angeformten head (7) and a loose head (8) exists. This loose head (8), which like the angeformte head (7) the edges of hole of the throughholes (4) spreads, is with a centric, against the pin shank (6) before-rising up clutch beginning (9) provided, which in a front side shank recess (10) intervenes. To the connection of of the loose head (8) with the pin shank (6) a connecting bolt (11) serves, which the pin shank (6) coaxially intersperses and into a nut thread (12) of the clutch beginning (9) intervenes. For the Drehsieherung this with a Imbuskopf (13) provided connecting bolt (11) serves in herkömmlieher way a lock washer (14). On the inside of the neck (3) radially inward the before-rising up are heads for (8) the tie bolt (5) in each case a protection collar (15) intended, whose thickness to the height of the neck-lateral heads (8), like this the Fig is adapted. 2 to be taken can do. These protection collars (15) run out in axial direction to a rejection point (16), so that by the casing pipes (1) and (2) led construction parts to be diverted and for the protection collars (15) no inadmissible loads to cause be able. The loose heads (8) the Verbindnngsbolzen (5) they remain surrounding protection collars (15) untouched by this Konstruküonsteilen due to that. To the twist lock the loose are heads (8) provided with a parallel a flattening (17), to the pin axle, which cooperate with an accordingly trained attack (18) of the protection collar (15). This attack (18) becomes likewise by a flattening the head (8) taking up recess (19) of the protection collar (15) in an educated manner, like this in Fig. 3 is suggested. For the loosening of of the represented connection only the connecting bolts to unscrew (11) are the tie bolt (5) from the nut thread (12) of the loose heads (8), before the Verbindungsbelzen (5) of the throughholes (4) to be taken out can. For connecting two casing pipes are in reverse order first the tie bolts to begin to connect (5) and afterwards with the loose heads (8) by the connecting bolts (11). Between the casing pipes (1) and (2) anflxetenden forces become thereby from the pin shanks (6) taken up, without loading the connecting bolts (11), so that the solubility of the connection remains also with high loads. The invention is naturally not limited to the represented remark example. So for example the trained could the neck in accordance with the represented Ausfühnmgsbeispiel as continuous ring (3) of the casing pipe (2) in individual, axially before-rising up latches dissolved or each tie bolt (5) assigned protection collar (15) by a common protection ring to be replaced. No. 389564