EP0475382A1 - Method and device for the lining of deep trenches - Google Patents

Abstract

Method for the lining of deep trenches by means of supporting frames which can be erected equally spaced in the trench longitudinal direction and are composed of two parallel supports (1, 2) and a stiffening frame (3) which connects and maintains the spacing of the supports (1, 2) and is displaceable along the supports (1, 2), and by means of large-area lining plates (4, 5) which can be introduced into guide channels of the supports. The supporting frames (1, 2, 3) and the lining plates are pushed or lowered into the trench following its excavation. The stiffening frame (3) between a lower stop (6) and an upper stop (7) is displaceably guided on the supports (1, 2), the lower stop (6) being arranged at the height of the required excavator-shovel clearance, about 1 to 1.50 m from the foot of the support, and the upper stop (7) being arranged at a distance from the lower stop (6) corresponding to the height of the stiffening frame (3), e.g. 1.75 m, and a permissible support advance, e.g. 0.5 m. After the supporting frame (1, 2, 3) has been erected and lowered to a level at which the upper edge of the stiffening frame (3) is situated at the height of the trench edge, the upper stops are removed, a second stiffening frame (3) is introduced into the supports (1, 2) of the supporting frame (1, 2, 3) and the upper stops (7) are fixed to the supports (1, 2) at a distance above the second stiffening frame (3). After the supporting frame (1, 2, 3) has been lowered by a further stiffening-frame height, the upper stops (7) are removed and a third stiffening frame (3) is optionally introduced into the supports (1, 2) of the supporting frame (1, 2, 3). For the retreat of the supporting frame (1, 2, 3), the stiffening frames (3) are connected to one another. <IMAGE>

Description

The invention is based on a method for shoring deep trenches by means of support frames which can be set up at equal intervals in the longitudinal direction of the trench, which are composed of two parallel supports and a stiffening frame which keeps the supports at a distance and connects and which can be displaced along the supports, and in both sides of the supports located guide channels with their lateral edges insertable, large-area shoring panels, in which the support frame and the shoring panels are pressed or lowered into the trench, following the trench excavation.

Such a method and an apparatus for carrying out this method are known from US Pat. No. 3,950,952.

In the known device, the stiffening frame is formed by two horizontal spreaders and two vertical guide heads, which are connected to form a rigid frame. The guide heads of the stiffening frames run within a cross-sectionally C-shaped support, and the guide heads are guided via pairs of rollers on both sides of a vertical slot in the wall of the support facing the trench. This stiffener frame can be moved vertically in the supports without affecting the parallelism of the supports.

The known shoring device with a height-adjustable stiffening frame has not proven itself in practice because the rollers of the stiffening frame are not able to absorb the high earth pressures that are transmitted from the shoring plates to the stiffening frame via the supports. The stiff frames run in this way tend to jam. It is too disadvantageous in the known shoring device that the C-shaped supports, which enclose the guide heads of the rigid frames, which are fitted with rollers, restrict the free trench cross section.

A shoring device is also known from DE-AS 17 08 539, in which two spreaders which keep the supports at a distance are connected via vertical struts to form a rigid rigid frame. This stiffener frame can be moved in the supports when the supports are unloaded. Because the rigid frame is guided in the supports via relatively short guide heads, displacement of the rigid frame under load is not provided and is also not possible. So that the stiffening frame does not slide down after setting up the support frame, it is fixed at the required height using retaining bolts. This shoring device has also not proven itself in practice.

For the construction of trenches with large-area shoring plates guided in supports, support frames are customary which are composed of two supports and two or more spreaders which run transversely to the trench and are articulated to the supports. The stability of this support frame is achieved via pre-tensioned springs, which are arranged between the supports and the struts. These support frames have the disadvantage that the supports can only be moved in the longitudinal direction by a relatively small amount compared to the other support. If one of the supports is pulled during the dismantling while the other support remains standing, the spacing of the supports from one another is reduced as a result of the inclined position of the spreaders. As a result, the floor can slide. If the opposite support is then pulled, the slid floor must be pushed back, which makes very high lifting forces of the excavator necessary. With this method and this shoring device, trenches over 6 m depth can only be built under particularly favorable soil conditions. The difficulty arises that when a support frame is inserted, the upper strut, which is articulated on the supports, sits very high, so that the excavator with its boom must grip over these high-seated struts. Only relatively large excavators can reach with the main boom over such a high-lying spreader. In this position, digging with a backhoe is also difficult.

The invention has for its object to provide a method with which deep trenches by means of large-area shoring plates guided in supports and in which lighter excavators can be used despite the large trench depth.

This object is achieved in that the rigid frame between a lower stop and an upper stop is slidably guided on the supports, the lower stop at the level of the necessary excavator bucket freedom about 1 to 1.50 m from the support foot and the upper stop is arranged at a distance from the lower stop, which is the height of the rigid frame, for example 1.75 m, and a permissible prop jacking, e.g. 0.5 m, and that after setting up and lowering the support frame to a level at which the upper edge of the rigid frame is at the level of the trench edge, the upper stops are removed, a second rigid frame is inserted into the supports of the support frame and the upper stops are attached to the supports at a distance above the second stiffener frame and that after lowering the support frame by a further stiffener frame height, the upper stops are removed and, if necessary, a third stiffener frame is inserted into the supports of the support frame and that the stiffener frames are connected to one another to dismantle the support frame.

• a) die Stützen weisen an ihren beiden Seiten zum Abstützen einer äußeren Verbauplatte und mindestens einer inneren Verbauplatte mindestens einen Führungskanal auf, der die Ränder mindestens der äußeren Verbauplatten in Grabenlängsrichtung formschlüssig aufnimmt,
• b) an den dem Graben zugewandten Innenseiten der Stützen sind zur Führung des Steifenrahmens flache C-förmige Führungsschienen angeordnet, deren Breite im wesentlichen der Breite der Stützen entspricht,
• c) der Steifenrahmen ist als winkelsteifer, starrer Rahmen ausgebildet, dessen Höhe (z.B. 1,70m) kleiner ist als ein Drittel der Höhe einer Stütze und ist über parallele, sich über die Höhe des Steifenrahmens und die lichte Breite der Führungsschiene erstreckende Schienen in den Führungsschienen der Stützen geführt,
• d) an den Führungsschienen sind in Reihen übereinander mehrere Aufnahmen zum Einsetzen von unterhalb und oberhalb des Steifenrahmens anzuordnende Anschläge angeordnet.

A device for performing this method is characterized by the following features:

• a) the supports have, on their two sides, for supporting an outer shoring plate and at least one inner shoring plate, at least one guide channel, which receives the edges of at least the outer shoring plates in a form-fitting manner in the longitudinal direction of the trench,
• b) on the inner side of the supports facing the trench, flat C-shaped guide rails are arranged for guiding the rigid frame, the width of which corresponds essentially to the width of the supports,
• c) the stiffening frame is designed as an angularly rigid, rigid frame, the height (for example 1.70 m) of which is less than a third of the height of a support and is via parallel rails which extend over the height of the stiffening frame and the inside width of the guide rail Guide rails of the supports,
• d) on the guide rails, several receptacles are arranged in rows one above the other for insertion of stops located below and above the rigid frame.

Further features of the invention result from subclaims 2 to 4 and 6 to 13.

The shoring method according to the invention and the device for carrying out this method are intended for shoring trenches 5 to 10 meters deep, although trenches that are less deep can be built in the same way. In the case of very deep trenches, the supports are provided with three or four guide channels on each side to accommodate the edges of the shoring panels. Accordingly, the excavated trench has two or three levels. Because, despite the great height of the supports, they are reliably held by only a rigid rigid frame, the excavator's boom can comfortably reach over this rigid frame at the start of trench excavation, the upper edge of which is in any case less than 2.50 m above the ground. This amount results from the following values: Depth of the lining - 1.00 m Height of the lower stop + 1.50 m Height of the stiffener frame + 1.70 m 2.30 m

The supports can be driven independently of each other, the upper stop takes the stiffener frame with them so that the free cantilever length in the lower area of the supports is not exceeded. When the shoring field has been lowered to the level of the shoring panels, the two shoring panels running inside are inserted into the guide channels of the supports. Now that the stiffener frame is lowered to below the top edge of the earth due to its height (approx. 1.70 m), the second stiffener frame is now inserted into the supports after fixing the upper stops and attached to the lower one. This attachment takes place with consideration of the dismantling. After that, the upper stops must be reassembled with the same stroke. Now the lowering of the inner plates and the supports can be continued. Because the stiffener frames can be pushed as required (depending on the total depth), the excavator with standard arm can be dredged cleanly and evenly over the frame between the shoring.

The supports and the mounting plates are designed so that at least two mounting plates and, if necessary, three or four mounting plates can be inserted on each side of the support.

The new shoring device has the advantage that it is possible to work with lighter excavators, that deeper trenches can be built economically than before, and that work can be carried out faster and with less interference if the trenches are less deep.

Fig. 1

vier Arbeitssituationen beim Einsetzen und Absenken eines Stützenrahmens,

Fig. 2

eine Ansicht eines Stützenrahmens mit eingeführten Steifenrahmen und Verbauplatten,

Fig. 3

schaubildliche Ansicht eines Teiles einer Stütze und eines Steifenrahmens,

Fig. 4

Draufsicht auf die Führung eines Steifenrahmens in einer Stütze,

Fig. 5

Schnittansicht einer Stütze mit eingeschobenen Verbauplatten und eingeschobenem Stufenrahmen,

Fig. 6

schaubildliche Ansicht eines Anschlages beim Einsetzen in eine Stütze,

Fig. 7

Draufsicht auf einen eingesetzten Anschlag,

Fig. 8

Schnittansicht und

Fig. 9

Draufsicht auf einen verriegelten Anschlag.

In the following description, exemplary embodiments of the invention are explained in more detail with reference to the drawing. The drawings show in

Fig. 1

four work situations when inserting and lowering a support frame,

Fig. 2

a view of a support frame with inserted stiffening frame and sheeting,

Fig. 3

perspective view of a part of a support and a rigid frame,

Fig. 4

Top view of the guidance of a rigid frame in a support,

Fig. 5

Sectional view of a support with inserted sheeting plates and inserted step frame,

Fig. 6

perspective view of a stop when inserted into a support,

Fig. 7

Top view of an inserted stop,

Fig. 8

Sectional view and

Fig. 9

Top view of a locked stop.

The device shown in FIGS. 1 to 3 serves to block trenches more than 6 meters deep. It has support frames which can be set up at equal intervals in the longitudinal direction of the trench and which are each composed of two parallel supports 1, 2 and a stiffening frame 3 which keeps the supports 1, 2 at a distance and connects them. The stiffener frame 3 is displaceable along the supports 1, 2. On both sides of the supports 1, 2 there are two guide channels 8, 9 into which large-area shoring panels 4, 5 with their lateral edges can be inserted. The support frames 1, 2, 3 and the shoring panels 4, 5 are lowered into the trench following the trench excavation or pressed into the trench with the excavator bucket. The support feet and the lower longitudinal edge of the shoring plates 4.5 are provided with cutting edges 13, which ensure that when the supports 1, 2 and shoring plates 4.5 are lowered, the protruding soil on the trench wall falls inwards into the trench. These known cutting edges 13 have the effect that when driving the supports 1, 2 these are not pressed from the ground towards the center of the trench, but remain vertical and are lowered parallel to one another.

The rigid frame 3 is slidably guided on the supports 1, 2 between a lower stop 6 and an upper stop 7. The lower stop 6 is attached at the level of the necessary excavator bucket clearance approx. 1 to 1.50 m from the lower end of the support. The upper stop 7 is arranged at a distance from the lower stop 6, which corresponds to the height of the rigid frame 3 and an allowable prop jacking. The stops 6 and 7 are easily displaceable and can be inserted into recesses 14 which are arranged one above the other in rows in guide rails 11 of the supports 1, 2.

After setting up and lowering the support frame 1, 2, 3 to a level at which the upper edge of the stiffening frame 3 is at height or below the trench edge (see FIG. 1B), the upper stops 6 are removed and a second stiffening frame 3 inserted into supports 1 and 2 of the support frame. The upper stops 7 are fastened to the supports 1, 2 at a distance above the second rigid frame 3. After lowering the support frame 1, 2, 3 by a further stiffener frame height, the upper stops 7 are removed again and, if necessary, a third stiffener frame 3 is inserted into the supports 1, 2 of the support frame. (cf. Fig. 1 C) To dismantle the shoring device, the stiffener frames 3 are easily detachably connected to one another, so that by pulling up the upper stiffener frame, the stiffener frames 3 connected therewith also follow.

The dismantling of the tiered sheeting is carried out in the same way as the installation, ie after the pipes have been inserted, soil is poured in layers up to a max. Lower edge of the lower stiffening frame 3. Then stiffening frame 3, sheeting plates 4.5 and supports 1.2 to the newly created level. If you have dismantled to the appropriate level, the inner shoring panels 5 and after removing the upper stops 7, the upper rigid frame 3 can be removed from the shoring unit. Then the upper stops 7 are attached over the last rigid frame 3 and the support frame 1, 2, 3 is pulled out of the essentially filled trench. The support frame 1, 2, 3 can then be used again on the trench head.

In the case of very deep trenches or even very large diameters of the pipes to be laid, the shoring device can also be dismantled in such a way that, after the stops 6 and 7 have been removed, only the shoring plates 4, 5 and the rigid frames 3, following the backfilling, are pulled upwards . After pulling the last last rigid frame 3 out of the guide rails 11 of the supports 1, 2 (see FIG. 1 D), the smooth supports 1, 2 can be pulled out individually. The excavator can be moved up to the supports 1,2 in such a way that it can pull the supports 1,2 out with the greatest force available to it. Before the supports 1, 2 are pulled, the cavity and the guide channels 8, 9 of the supports 1, 2 can be filled with sand or gravel.

Assembling the column frame:

A support 1 is placed horizontally on the floor with its back. Then the lower stop 6 is inserted at the required height into a receptacle 14 in the row of holes on the support 1. The stop height can be 1 m to 1.50 m from the column foot 13, so that the excavator can reach with its digging vessel under the rigid frame 3 and can cut the trench between the columns 1, 2 to further lower the columns. Then the stiffener frame 3 is inserted horizontally from the support head side with its rail 12 into the guide rail 11 of the support 1. Then the second support 2 is inserted horizontally into the opposite rail 12 of the rigid frame 3. Then they will upper stops 7 used. The distance of the lower stop 6 to the upper stop 7 should be about 0.5 m higher than the height of the rigid frame 3. The stop 7 limits the pushing of a support 1 or 2, so that the free cantilever length of the supports 1,2 does not exceed their maximum value can come. In this way, the first column frame is created. The other support frames are constructed accordingly.

Installation of the shoring device:

First, part of the trench is excavated, namely in the width of the support frame 1, 2, 3 and to a length of 1 x shoring plate length plus the width of a support (for example 0.5 m). Depending on the soil conditions, the excavation takes place at a depth of approx. 1 m. Then the first support frame 1, 2, 3 is set using a chain sling and an excavator. The chain sling is attached to the support heads. The rigid frame is held by the lower stops 6. After aligning the support frame, the two outer upper shoring plates 4 are inserted into the guide channels 8 of the supports 1 and 2 of the first support frame and aligned parallel to the trench axis. A second support frame with the guide channels 8 is then threaded over the edges of the shoring panels 4 pointing towards the excavator. The first shoring panel is now in place and excavation of the trench can begin. Since the upper edge of the rigid frame 3 is lower than 2.50 m above the ground, a relatively small excavator can reach over the rigid frame and dig a deep trench.

So that the insertion of the rails 11 of the rigid frame 3 into the guide rails 12 of the supports 1 and 2 can be carried out quickly and without problems, as shown in FIG. 4, the upper ends of the guide rails 11 are funnel-shaped and the side rails 12 of the step frame 3 are on the lower and upper corners 29 beveled. In addition, you can 12 guide plates 27 and 28 can be arranged at the upper end of the guide rail, which facilitate the insertion of the rails 11 of the rigid frame 3 into the guide rails 12 of the supports 1, 2. These guide plates 27, 28 are arranged on the supports 1, 2 in such a way that the insertion of the shoring plates 4, 5 into the inner guide channels 9 is not hindered. In Fig. 3, these baffles 27,28 are omitted.

3 shows a view of the upper part of a support 1 with two guide channels 8, 9 on each side and on the wall facing the trench, a guide rail 11 which receives a side rail 12 of the rigid frame 3.

The support 1 shown is designed so that the edges of both the outer shoring panels and the inner shoring panels can be positively received in the longitudinal direction of the trench by the guide channels 8 and 9.

At the upper end of the support 1, a sleeve 23 is arranged, in which the hook of a chain sling can be hooked. The rigid frame 3 is also provided with a sleeve 24 for hanging a hook.

The stiffener frame 3 consists of horizontally and vertically extending box hollow sections 33 and 34. In the corners of the merging hollow sections 33 and 34, corner stiffeners 35 are arranged so that the stiff frame is given very high rigidity even with relatively thin wall thicknesses and the side rails 12 of the stiffener frame Remain completely parallel even under the highest loads.

As shown in FIG. 4, narrow sliding ribs running longitudinally are arranged on the parts of the guide rail 11 that clasp the rail 12 and come to rest against the back of the rail 12 with play. On both sides of the guide rail 11 are on the guide rail 11 or on the Rail 12 of the rigid frame 3 fixed sliding strips 32 are arranged, which are wide compared to the narrow sliding ribs 31 because they have to transfer the large loads from the supports to the rigid frame. The sliding strips are made of a material with very good sliding properties. The distance between these sliding strips should be as large as possible and larger than the support lines of the edges of the shoring panels 4 and 5 in the supports 1 and 2. This measure has the advantage that when the supports 1 and 2 are loaded on one side, no torque is applied to the supports 1 and 2 acts.

Although the play between the sliding rib 31 and the rear of the rail 12 can be relatively large, there is no reason to fear that the parallelism of the supports 1 and 2 to one another is impaired because of the great height (1.50 to 1.90 m).

In the embodiment of the shoring device according to FIG. 5, two guide channels are not provided on both sides of a support 1 ', but only one guide channel 8' each, which is formed by a support flange 50 and a guide flange 51. Both the outer shoring panels 4 'and the inner shoring panels 5' are guided in this guide channel 8 '. Both shoring plates 4 'and 5' are supported by support webs 52 and 53 on the support flange 50 of the support 1 '. The shoring plates 4 'and 5' are designed differently. The outer shoring plates 4 'are somewhat wider and have a relatively long support web 52 which engages around the inner shoring plate 5'. The edge of the outer shoring panels 4 'is positively guided in the longitudinal direction of the trench in the guide channel 8' of the support 1 '. The inner shoring plates 5 'are supported on the support flange 50 via the support web 53. The support flange 50 is reinforced by the guide rail 11. A side flange 56 is angled from the support flange 50 in such a way that support rollers are arranged one above the other between this side flange 56 and the side walls 58 of the support 1 ' 57 can be arranged, on which the supporting webs 52 and 53 of the shoring panels 4 'and 5' run.

So that the shoring plates 4 'and 5' between two supports 1 'or 2' do not tilt when the props are being pushed or pulled, the four corners of the shoring plates 4 'and 5' are open towards the narrow sides of the shoring plates 4 'and 5' pocket-like housing 58 arranged in which rollers 54 and 55 are mounted. The rollers 54 roll on the side walls 59 of the supports 1, while the corner rollers 55 of the inner shoring panels 5 'run on the outer sides of the side flanges 56. These corner rollers 54 and 55 prevent the sheeting plates between the supports of this shoring wall from not jamming during the relative movement of a support of a loaded shoring wall.

As shown in FIGS. 6 to 9, the stops 6 and 7 which can be inserted below and above the rigid frame 3 into the recesses 14 of the guide rail 11 have an insert 15 which is adapted to the rectangular cross section of the recess 14. The stops 6 and 7 are provided with a lock 16 which can be pivoted through 90 ° and which can be pivoted into the open position and the closed position via a shaft 17 passing through the insert piece 15 and a lever 18. The lever 18 is designed so that it presses the bolt 16 into the locked position when a rigid frame abuts the stop 6 or 7. Since relatively large forces can act on the stops 6 and 7, it has a hook-like extension 19 with a second insert 20 which can be inserted in a second recess 14 in the row of holes. A nose 21 engages behind the guide rail 11. The stop 6 or 7 or the extension 19 is provided with a bow-shaped handle 22, with which the stop can be easily inserted into the recess 14 of the guide rail 11. 8 and 9 show the stop 6 in the locked position.

Reference symbol list:

1.1 '

support

2nd

support

3rd

Rigid frame

4.4 '

Sheeting plate

5.5 '

Sheeting plate

6

Stop below

7

Top stop

8.8 '

Guide channel

9

Guide channel

10th

inside

11

Guide rail

12

Rail of the rigid frame

13

Cutting edge

14

Recesses

15

Insert

16

bars

17th

wave

18th

lever

19th

Continuation

20th

Insert

21

nose

22

Handle

23

Support eyelet

24th

Frame eyelet

25th

Coupling link

26

funnel-like extension

27th

Baffle

28

Baffle

29

bevel

30th

cavity

31

Sliding rib

32

Sliding strips

33

Box profile

34

Box profile

35

Corner stiffener

36

Screw flange

50

Support flange

51

Guide flange

52

Landing stage

53

Landing stage

54

Corner roller

55

Corner roller

56

Side flange

57

Support roller

58

casing

59

Side wall

Claims (20)

Method for the construction of deep trenches by means of support frames which can be set up at equal intervals in the longitudinal direction of the trench, which are composed of two parallel supports and a stiffening frame which holds and connects the supports at a distance and can be moved along the supports, and in guide channels with their lateral edges located on both sides of the supports insertable large-area shoring panels, in which the support frame and the shoring panels, following the trench excavation, are pressed or lowered into the trench, characterized in that the rigid frame is slidably guided on the supports between a lower stop and an upper stop, the lower stop in Height of the necessary excavator bucket freedom approx. 1 to 1.50 m from the column foot and the upper stop is arranged at a distance from the lower stop, which corresponds to the height of the stiffening frame, e.g. 1.75 m, and a permissible prop jacking, e.g. 0.5m, and that after setting up and lowering the support frame to a level at which the upper edge of the stiffener frame is at the level of the trench edge, the upper stops are removed, a second stiffener frame is inserted into the supports of the support frame and the upper stops in Distance above the second stiffener frame are attached to the supports and that after lowering the support frame by a further stiffener frame height, the upper stops are removed and, if necessary, a third stiffener frame is inserted into the supports of the support frame and that the stiffener frames are connected to one another to dismantle the support frame. A method according to claim 1, characterized in that when the shoring device is dismantled, after removing the lower stops, the trench is filled and the shoring panels and the stiffening frames are pulled upwards, following the backfilling, and then the upper stiffening frames are removed from the first Pull out the guide rails, then pull out the shoring plates from the guide channels, then pull out the lower stiffening frame and finally, after filling the trench, the supports are pulled out individually. Method according to Claim 2, characterized in that sand or gravel is filled into the column cavity and into the guide channels before the columns are pulled. A method according to claim 1, characterized in that when the shoring device is dismantled, the trench is filled and the shoring panels, the supports and the stiffening frames are drawn, following the backfilling, and the upper stiffening frames are removed from the guide rails of the supports and the shoring panels after the upper stops have been removed the guide channels of the supports are pulled out and then the upper stops are placed over the rigid frame and the support frame is pulled out of the filled trench. Shoring device for performing the method according to one of claims 1 to 4 consisting of - in pairs at equal intervals along the trench to be arranged opposite vertical supports (1,1'2), - a stiffening the supports (1,1 '2) at a distance (3) which is vertically displaceable in the supports (1,1 '2) is led and - large-area shoring panels (4,4'5,5 '), the edges of which are guided and supported in the guide channels of the supports (1,1'2), characterized by the following features: a) the supports (1, 1, 2) have at least one guide channel (8, 9, 8 ') on both sides for supporting an outer shoring plate (4, 4') and at least one inner shoring plate (5, 5 ') which positively receives the edges of at least the outer shoring panels (4, 4 ') in the longitudinal direction of the trench, b) on the inner side (10) of the supports facing the trench (1,1'2) are arranged for guiding the rigid frame (3) flat C-shaped guide rails (11), the width of which essentially corresponds to the width of the supports (1,1'2), c) the stiffening frame (3) is designed as an angularly rigid, rigid frame, the height (for example 1.70 m) is less than a third of the height of a support (1,1'2) and is parallel over the height of the Rigid frame (3) and the clear width of the guide rail extending rails (12) in the guide rails (11) of the supports (1,1 '2) d) a plurality of receptacles (14) for inserting stops (6 and 7) to be arranged below and above the rigid frame (3) are arranged one above the other on the guide rails (11). Shoring device according to claim 5, characterized in that the C-shaped guide rails (11) have a funnel-like extension (26) at least at their upper ends. Shoring device according to claim 6, characterized in that at the upper end of the C-shaped guide rails (11) guiding plates (27, 28) facilitating the insertion of the lateral rails (12) of the rigid frames (3) are arranged, which are on both sides of the guide rails ( 11) and in the middle area of the guide rail (11) funnel-like into the guide gap. Shoring device according to one of claims 5, 6 or 7, characterized in that the lateral corners of the rails (12) of the rigid frame (3) are chamfered at the upper and lower ends. Shoring device according to one of claims 5 to 8, characterized in that the receptacles (14) are rectangular recesses arranged in the longitudinal center of the guide rail (11) and the stops (6, 7) with insert pieces (15) are provided, the shape of which corresponds to the shape of the recesses (14). Shoring device according to claim 9, characterized in that the stops (6, 7) are provided with a bolt (16) which can be pivoted through 90 ° and which, in the open position, has a shaft (17) passing through the insert (15) and a lever (18) and closed position is pivotable. Shoring device according to one of claims 5 to 10, characterized in that the stop (6 or 7) has a hook-like extension (19) which can be inserted into a second recess (14) in the row of holes and which has an insert (20) and an engaging nose ( 21) is provided. Shoring device according to claim 11, characterized in that the stop (6 or 7) is provided with a bow-like handle (21). Shoring device according to one of claims 5 to 12, characterized in that the stiffening frames (3) are mirror images of the horizontal center line and have eyelets (24) in their four corner areas for hooking in a chain. Shoring device according to claim 13, characterized by coupling members (25) engaging in the eyelets (24) of the rigid frames (3) in a plug-like manner. Shoring device according to one of claims 5 to 10, characterized in that the stiffening frames (3) consist of horizontally and vertically running box profiles (33, 34). Shoring device according to claim 15, characterized in that the horizontally extending box profiles (33) over Merge corner stiffeners (35) into the vertical box sections (34). Shoring device according to claim 15 or 16, characterized in that the horizontally running box profiles (33) are detachably connected to the vertically running box profiles (34) via screw flanges (36). Shoring device according to one of claims 15 to 17, characterized in that the side rails (12) of the rigid frame (3) form the outer walls of the vertical box sections (34). Shoring device according to one of claims 5 to 18, characterized in that longitudinal sliding narrow ribs (31) are arranged on the clasping parts of the guide rail (11) and come to rest against the back of the rails (12) with play. Shoring device according to one of claims 5 to 19, characterized in that relatively wide sliding strips (32) are arranged on both sides of the guide rail (11), on the guide rail (11) or on the rail (12) of the rigid frame (3) .

Images