SHEETING DEVICE FUR A LINE DITCH OD.DGL. WITH GRADATED CROSS SECTION

RST the invention concerns a Verbauvorriehtung consisting for a line ditch od.dgl., of sheeting mechanisms, which are formed for facing and supports connected by spreading and herein wall elements adjustably held each other in pairs out, whereby arranged verb no directions are connected one above the other. Admit are sheeting devices for line ditches with rectangular or trapezoidal cross section, which from perpendicular or supports diagonally placed, so that and one pair of posts connected and this Spauneinrichtungen pressing against the ditch wall each are formed for connected verb walls. Hievon gives it a large number of different execution forms. The depth of such ditches is limited because of the Grahenquerschnittes. If one wants to dig deeper ditches, then one is compelling to use a gradated cross section. This has besides the advantage that the exhibition the close Grahensohle can be more strongly ausgeflihrt than with ditches with gleichbleihendem cross section. However such a ditch requires relatively long supporting posts, so that the sheeting device is easily exposed to a buckling danger or must several from each other independent sheeting devices be planned. With the latter however the transition from a Verbaneinriehtung is critical to others, since an appropriate Versteifuug is not intended here. A gradated ditch cross section permits the installation of to a large extent perpendicular verb walls and offers thereby also a larger Arbeitsraura and more security than rectangular or trapezoidal Grabenquerschnätte. By the USA patent specification Nr.841, 773 a trench sheeting and bracing is well-known, with which articulated with one another connected supporting elements with H-profile are intended, are held apart by spreading and in their slots Wandelemeute in form of a Verbretterung are held. The supporting elements possess trichterförmige projections at their top side to the EiufüUen that verb rescue run gene as well as hakenförmige elements, which can intervene in appropriate eyes at the lower surfaces in each case of the supporting elements arranged over it. This “articulated” sheeting results in a complete boarding of a ditch with more or less complicated cross section, but the entire earth forces of spreading is only taken up, while the supports serve only as guiing devices for the Verbretterung. A gradate-like arrangement of a sheeting is possible only if with three supports arranged one above the other the middle support is arranged diagonally, whereby its supporting effect is lost however to a large extent. A such sheeting lets itself press also not more with the well-known means, for example a crane bucket, into the ground, but can only than additional Ausldeidung be planned. From the book Szechy “the foundation engineering” Bd.2, 8,16 to 18 (Springer publishing house, Berlin 1965) furthermore is on the one hand and well-known by means of telescopic extendable supports on the other hand a stage sheeting by means of bung pins. These telescopic extendable supports taper themselves toward to their foot, so that they are not suitable to hold between itself verb walls. It is hiebei necessarily, the supports in complex way later too kinterf üttern. The invention the task is the basis accordingly to create a sheeting device for a gradated line ditch which consists of few different construction units, which can be driven to a large extent independently with the help of an excavator into the soil and pulled out of this again. The solution of this task consists in accordance with the invention of that at least two supports arranged one above the other are connected transverse to the longitudinal direction of the sheeting mechanisms to each other transferred and on at least one part of their length lying on top of one another. With the Stufenverban according to invention in pairs facing supports are driven into the ground, which exhibit into actually well-known way lateral guidance for the admission of sheeting walls and additionally likewise actually admitted each other opposite guidance for the shoes of spreading members possess. These guidance serve at the same time also as guidance for further supports, which are applicable for a Bauahschnitt lain more deeply. The additional supports can be pressed down then with increasing ditch excavation downward, u.zw with or without sheeting walls already set. The lower sheeting walls can be moved thereby independently of those the upper Bauahschnitte upward or down. One can leave it also as “lost training” in the ditch, if this should be necessary. Besides the supports can be moved against each other and also opposite the sheeting walls perpendicularly, without the Geometrle of the Grahenverbaus and its static security suffer by this. A Ausf'ührungsform of the invention consists of the fact that supports the upper in each case sheeting mechanism by the lower edge of the assigned sheeting walls downward extended and with the superior support of the lower verb no direction is connected. In accordance with further arrangements the invention this connection can be firmly or positively sliding implemented. The sheeting device according to invention favourably exhibits for driving the supports into the supports insertable, and/or on this put onable u-shaped anvil, whose thigh is unequally long. Below the invention is more near described on the basis the designs with remark examples, u.zw. show: Fig.1 a transverse longing CCIT by a ahgestuften Grabenverban, Fig.2 an increased cross section after the line II-II in Fig.1, Fig.3 an increased cross section after the line III III in Fig.1, Fig.4 a modified sheeting device in accordance with the invention, Fig.5 an increased cross section after the line V-V in Fig.4, Fig.6 an increased cross section after the line VI-VI in Fig.4 and Fig.7 a sheeting device after Fig.4 with an anvil. Fig.1 shows a cross section by a ditch --1-- with a gradated sheeting device --2--. This consists of posts --3, 4-- of these sheeting walls held --5, 6-- and each other facing sheeting mechanisms against the ditch wall pressing tensioning arrangements --7--, which exhibit spindles usually moving in opposite directions. These tensioning arrangements point at their ends shoes --8-- up, those in the posts --3, 4-- held, preferably also slidable led are. They can be secured also in well-known way by pins. The execution form of the Fig.1 to 3 makes it possible, the sheeting walls --5, 6-- positively with the posts formed from steel sections --3-- to connect. With the Ausf'ührungsform described here are enough the outside posts --3-- up to the ditch sole. In the upper section --9--, whose is shown cross section in Fig.2, are the sheeting walls --5-- held, their lower edge to something underneath the upper edge of the posts --4-- is enough, in which the sheeting walls of the lower Absehnittes are held. Each post --4-- stands before the lower section --10--. the associated posts --3-- and is connected with these rigidly, e.g. by means of weld or screws. Around excess lengths of the posts --3-- to avoid, these can be compound from individual parts also in an appropriate way. Fig.3 shows a cross section by the lower section --10--. The gradation shown lets itself repeat also in principle still further. The Fig.4 to 7 shows another Ausflihrungsform in accordance with the invention. Is the outside post --3 '-- only to something underneath the upper edge of the lower post --4-- into the soil driven. The post --4-- is in the guidance --11--, those for the shoe --8-- the tensioning arrangement --7-- certainly is slidable led, and supports themselves with his upper section --12-- at the post --3 '-- off. Each post --3, 4-- , like also two I-beam sections with lateral bracket sections, welded with one another during the mechanism in accordance with the Fig.1 to 3, essentially of, and at least partly points a guidance consists --11-- f'ür the shoes --8-- the tensioning arrangements --7--as well as lateral guidance --12-- for the positive admission of heads --13-- the sheeting walls --5, 6-- up. As well known the posts are pressed by means of a crane bucket into the ground. There the internal posts --4-- for the crane bucket, is an u-shaped anvil is with difficulty accessible --14-- intended, its a thigh is somewhat longer than the effective height of the sheeting wall --6--. Such an anvil is represented in Fig.7. It becomes from above on or into the posts --3, 4-- set, e.g. like Fig.7 points, to transverse pins --16-- inside the posts touched down and by means of crane bucket or another ramming hammer, schematically also --15-- designated, into the soil floated. The sheeting mechanisms in accordance with the invention permit on the one hand a shifting of the tensioning arrangements --7-- in well-known way. Beyond that the tensioning arrangements of the individual stages can be drawn during the sheeting device in accordance with the Fig.4 to 7 separately and independently, whereby one proceeds appropriately from the internal sheeting mechanisms. This is also possible, if one the sheeting mechanism --2-- in accordance with Fig.1 out builds solvable connected mechanisms up. If one solves these sheeting mechanisms from each other, then in particular the advantage results that the lower part of the posts --3-- no more sheeting walls exhibits, so that this can be easily pulled, even if the ditch is up to then already again angef'üllt. The guidance --11-- the post --3,4-- can partly interrupted or amended be to offer in particular in order the possibility of using a further sheeting mechanism within the ditch into the lower part of the guidance. The internal posts do not need to be einge£'ührt then by the upper end of the outside posts out.