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EP-4741578-A1 - SLOTTED WALL CUTTER WITH SUCTION BOX

EP4741578A1EP 4741578 A1EP4741578 A1EP 4741578A1EP-4741578-A1

Abstract

The invention relates to a method for mounting a suction box on the milling frame of a diaphragm wall cutter, wherein the suction box is connected to the milling frame via several connecting elements which are inserted into receptacles in the milling frame and in the suction box. According to the invention, before the connecting elements are inserted, the suction box is pre-positioned on the milling frame by means of at least one positioning element, which is inserted into receptacles provided for the connecting elements to align the suction box and is subsequently removed.

Inventors

  • LORÜNSER, Dominik
  • Fend, Adrian

Assignees

  • Liebherr-Werk Nenzing GmbH

Dates

Publication Date
20260513
Application Date
20251002

Claims (14)

  1. Method for mounting a suction box (20) on a milling frame (11) of a diaphragm wall milling machine (10), wherein the suction box (20) is connected to the milling frame (11) via several connecting means (14) which are inserted into receptacles (15, 16) in the milling frame (11) and in the suction box (20), characterized by that before the insertion of the connecting means (14) the suction box (20) is pre-positioned on the milling frame (11) by means of at least one positioning means (30), which is inserted into receptacles (15, 16) provided for the connecting means (14) to align the suction box (20) and is then removed.
  2. Method according to claim 1, wherein the connecting means (14) are designed as screws and the receptacles (15, 16) are designed as bores, wherein preferably the bores (15, 16) do not have an internal thread and/or the screws (14) are screwed together with nuts.
  3. The method of claim 1 or 2, wherein the positioning means (30) is designed as a positioning bolt which preferably has a angular shape at one end has a tapered and in particular conically shaped section (32) as an insertion aid.
  4. Method according to one of the preceding claims, wherein the positioning means (30) comprises a threaded section (34) and a pull-off nut (36), wherein the positioning means (30) together with the pull-off nut (36) held on the threaded section (34) is inserted into the receptacles (15, 16) and, after pre-positioning, is at least partially moved out of the receptacles (15, 16) by rotating the threaded section (34) relative to the pull-off nut (36).
  5. Method according to claim 4, wherein the threaded section (34) extends substantially over the entire length of the positioning means (30), wherein by rotating the threaded section (34) relative to the pull-off nut (36) the positioning means (30) is preferably moved completely out of the receptacles (15, 16).
  6. Method according to claim 4, wherein the threaded section (34) extends only over a partial area of the positioning means (30), wherein by rotating the threaded section (34) relative to the pull-off nut (36) the positioning means (30) is pushed out of the receptacles (15, 16) only up to a maximum height determined by the axial length of the threaded section (34) and the positioning means (30) is subsequently withdrawn from the receptacles (15, 16) without using the pull-off nut (36).
  7. Method according to one of the preceding claims, wherein the suction box (20) is pre-positioned via at least two positioning means (30), which are preferably placed on opposite sides with respect to an imaginary vertical central plane (40) passing through the middle of the suction box (20).
  8. A method according to any of the preceding claims, wherein, after removal of the positioning means (30), a connecting means (14) is inserted into the previously formed the images (15, 16) taken with the positioning device (30) are introduced.
  9. Method according to one of the preceding claims, wherein the at least one positioning means (30) is not used to connect the suction box (20) and the milling frame (11).
  10. Method according to one of the preceding claims, wherein the receptacles (15, 16) of suction box (20) and milling frame (11), into which the at least one positioning means (30) is inserted for pre-positioning, are used together with a connecting means (14) for connecting suction box (20) and milling frame (11) after removal of the positioning means (30).
  11. A method according to any of the preceding claims, wherein the following steps are carried out sequentially: - Inserting at least one positioning means (30) into receptacles (15, 16) and pre-positioning the suction box (20) relative to the milling frame (11), preferably inserting at least two, in particular exactly two, positioning means (30) one after the other in order to center the suction box (20) with respect to an imaginary vertical central plane (40) running through the middle of the suction box (20), - Inserting at least one connecting element (14) into other receptacles (15, 16) while the at least one positioning element (30) is inserted to firmly connect the pre-positioned suction box (20) to the milling frame (11), - Removal of at least one positioning device (30) from the receptacles (15, 16), and - Insertion of at least one connecting element (14) into the receptacles (15, 16) previously occupied by the at least one positioning element (30).
  12. Method according to one of the preceding claims, wherein the suction box (20) has at least one suction opening (22) on a suction side (21) for suctioning liquid containing soil material, wherein the suction side (21) is formed in particular on a suction section (23) of the suction box (20) with a substantially V-shaped cross-section.
  13. Method according to one of the preceding claims, wherein the slot wall milling machine (10) comprises two radially arranged and in particular counter-rotating milling wheels (12) which are arranged on a lower section of the milling frame (11), wherein the suction box (20) is arranged at least partially radially between the milling wheels (12).
  14. Method according to one of the preceding claims, wherein the slot wall milling machine (10) comprises two pairs of radially adjacent and in particular coaxially mounted milling wheels (12) which are arranged on a lower section of the milling frame (11), wherein the suction box (20) preferably comprises a common base body for both pairs of milling wheels, which is arranged at least partially radially between the milling wheels (12).

Description

The present invention relates to a method for mounting a suction box on a milling frame of a slot wall milling machine according to the preamble of claim 1. Diaphragm wall cutters are used to create trenches for the construction of diaphragm walls in a wide variety of construction projects and are available in various designs and sizes. Typically mounted on mobile carriers such as mobile cranes or cable excavators, they have multiple cutter wheels with cutting tools to remove soil material to create a trench. The cutter wheels are typically rotatably mounted on one or more bearing plates (gear plates), which may be located on the underside of a cutter frame. A common configuration includes two pairs of cutter wheels, with each pair mounted on its own bearing plate, one cutter wheel on each side of the plate. Such trench cutters typically have a suction box in the area between the cutter wheel pairs, which primarily serves to extract the excavated material or soil from the trench. For this purpose, a [missing information] is attached to the suction box. A series of suction openings are provided through which liquid containing soil material is extracted by means of a wastewater pump. Its other functions include crushing the soil material loosened by the milling wheels. For this purpose, suction boxes can have a series of clearing elements on the sides, which protrude into the spaces between the cutting tools arranged on the milling wheels and clear material from there, potentially crushing it further. Since these usually plate-shaped clearing elements are wear parts, they are generally detachably attached to brackets on the suction box. The suction box is typically mounted to the milling frame using several screws. To insert the screws, the suction box must be correctly aligned with the milling frame. Pre-positioning is usually done manually using tactile feedback points on the suction box and the milling frame, or visually. However, due to the considerable weight of the components and the potential for error introduced by feeling the tactile feedback points, precise centering is difficult to achieve. The present invention is therefore based on the objective of facilitating the mounting of the suction box on the milling frame. According to the invention, this problem is solved by a method having the features of claim 1. Advantageous embodiments of the invention are described in the dependent claims and the following description. According to the invention, a method for mounting a suction box on a milling frame of a diaphragm wall milling machine is proposed, in which the suction box is connected to the milling frame via several connecting means, wherein the connecting means are inserted into receptacles, in particular bores, formed in the milling frame and in the suction box. The suction box is preferably mounted on the underside of the milling frame and, during operation, is located in a space between the milling wheels and the milling frame. The connecting means can be elongated and/or have a cylindrical shape and are inserted, in particular plugged, into the receptacles in a vertical direction (such information refers here to the case that the diaphragm wall cutter is vertically oriented). According to the invention, the suction box is pre-positioned on the milling frame by means of at least one positioning device before the connecting means are inserted. The positioning device is inserted into receptacles provided for a connecting means, whereby the suction box aligns itself automatically on the milling frame through the insertion of the at least one positioning device. The pre-positioning or alignment of the suction box by inserting the at least one positioning device is thus achieved in particular by means of positive locking. After pre-positioning the suction box, the at least one positioning device is removed, allowing the corresponding receptacles to be used for attaching the suction box with at least one fastener. The at least one positioning device is therefore not used itself for attaching the suction box to or connecting it to the milling frame, but solely for pre-positioning. Using the receptacles provided for the fasteners enables very precise positioning at low cost and with high reproducibility, without requiring any special modifications to the steel structure of the suction box or the milling frame for the pre-positioning function. Preferably, before removing the at least one positioning device, the pre-positioned suction box is secured or fastened to the milling frame using at least one connecting device. The at least one positioning device can then be removed, and the final connection(s) between the suction box and the milling frame can be made using the now-available mounting points to complete the suction box assembly. When the term "positioning device" is used below, it always refers to at least one positioning device, unless otherwise specified. In one possible embodiment, the conne