EP0748899A1 - Panneau de cage de blindage - Google Patents

Panneau de cage de blindage Download PDF

Info

Publication number
EP0748899A1
EP0748899A1 EP96304370A EP96304370A EP0748899A1 EP 0748899 A1 EP0748899 A1 EP 0748899A1 EP 96304370 A EP96304370 A EP 96304370A EP 96304370 A EP96304370 A EP 96304370A EP 0748899 A1 EP0748899 A1 EP 0748899A1
Authority
EP
European Patent Office
Prior art keywords
panels
trench
struts
manhole
trenching apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96304370A
Other languages
German (de)
English (en)
Inventor
Timothy J. Griffiths
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ashtead Plant Hire Co Ltd
Original Assignee
Ashtead Plant Hire Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ashtead Plant Hire Co Ltd filed Critical Ashtead Plant Hire Co Ltd
Publication of EP0748899A1 publication Critical patent/EP0748899A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/06—Foundation trenches ditches or narrow shafts
    • E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations

Definitions

  • This invention relates to trenching apparatus, in particular to trench lining apparatus for use in forming manholes.
  • Known trench linings comprise steel panels, pairs of which are pin-jointed together face to face to form a box module.
  • the box module is then lowered by an excavating machine into a pre-dug trench.
  • a trench is partially dug, a box module lowered thereinto and then pressed down by the excavating machine. Thereafter the trench is completed by alternate excavation and pressure.
  • the panels may have lower cutting edges to assist in placement and extension panels may be provided, without any cutting edge, which are bolted onto pre-positioned panels.
  • the boxes are located end to end but are not, in general, joined to each other.
  • the trench width must be increased.
  • a widthwise gap is produced on either side of the main trench line between the panels supporting the manhole portion of the trench and those adjacent thereto.
  • Transverse fill-in plates are used to close off these gaps. These may be secured in situ by welding direct to the manhole panels or by bolting to plates themselves welded to the panels.
  • purpose built man-hole boxes have been provided with pre-welded fill-in plates, the struts then extending between the edges of the fill-in plates rather than to the side thereof between the manhole panels. In either case, the struts are subjected to the pressure of the soil behind the fill-in plates which acts transversely to the axes thereof and can cause struts to bend.
  • the struts generally comprise two or more parts which are relatively adjustable to give a variable strut length. Some play is provided between the two parts to allow for the fact that the strut attachment points will not be exactly oppositely positioned. The sideways pressure on the struts at manholes can cause the parts to jam up and destroy the play therebetween.
  • Trenching apparatus in accordance with the invention, comprises two panels positionable in use vertically to support the sides of a trench, the panels being connected and spaced by struts extending therebetween and being shaped such that in use the spacing is a maximum at their lengthwise centres and decreases generally continuously either side thereof to the edges of the panels.
  • the panels may have a V cross-section or a curved cross-section.
  • manholes can be formed without the need for fill-in plates as the shaping of the panels means that no gap is produced between them and the adjacent panels of the main trench line.
  • the amount of excavation required to form the manhole is reduced as the outlines of the trench hole simply need to follow the shape of the panels, which in turn, in effect, follow the shape of the manhole pipe.
  • the apparatus is cheaper to produce than known purpose-built manhole trench lining as the need to weld or bolt the fill-in panels onto the main panels is obviated. Further there is a saving in material and consequently in weight which may be quite significant as trench lining panels can have weights in the order of 2,000 kg.
  • the panels may include connecting means for securing the struts thereto with angled adapters whereby the struts extend generally parallel to a line between the panels' lengthwise centres. The struts are thereby aligned in the direction of maximum force.
  • the trenching system of Figure 1 includes a plurality of trench boxes 2, only two of which are illustrated.
  • the boxes 2 are employed to support the walls of a trench in which a pipe 4 is to be laid.
  • the trench boxes 2 comprise a pair of steel panels 6 and adjustable struts 8 pin-jointed to form box modules.
  • the panels 6 may have a lower cutting edge 10.
  • extension panels 12 may be secured to the panels 6 if the height of the trench necessitates this.
  • the extension panels 12 are also spaced and connected by struts 8.
  • the panels 6 may be, for example, 3.5 m long and 2.5 m high.
  • the width between the pair of panels 6 of a trench box 2 may be between, say, 800 mm and 4,500 mm.
  • the struts 8 are generally adjustable to allow the width to be set at that suitable for the trench width, but to accommodate a width range of the exemplary extent a number of differently lengthed struts are normally provided as part of the trench lining system.
  • the struts 8 may take any desired form but commonly they have a clevis fitting at both ends which enables them to be pinned to pillars 14, one of which is provided at each end of the panels 6 of the trench boxes 2.
  • pillar 14 Various forms of pillar 14 are known, but that illustrated takes the form of two U cross-section beams positioned back to back and secured by one flange to the panel 6.
  • a series of spaced aligned holes are provided in the webs for receipt of the bolts whereby the struts are connected.
  • the bolts may be held in place by retaining clips secured through their ends.
  • the system is, therefore, capable of fairly rapid assembly and dis-assembly.
  • the system illustrated in Figure 1 includes a prefabricated "manhole box" 20 which includes panels 22 of similar form to those 6 of the trench hole boxes 2 but without pillars 14, and, side fill-in plates 24 welded to the ends of the panels 22 transversely to the plane thereof.
  • the fill-in plates 24 are provided with pillars 14 whereby they may be connected by struts 8.
  • the manhole box 20 may be provided with extension panels 26.
  • the length of the manhole box 20 is set by the maximum diameter of ring 18 to be accommodated therein.
  • the width of the fill-in plates 24 must be sufficient so that there will be no gap between these and the panels 6 of the adjacent trench boxes 2, with the maximum diameter of ring 18 and minimum trench box width.
  • the main pressure, P1 acting on the manhole box 20 is from the soil behind the panels 22.
  • This pressure, P2 may bend the struts 8 and/or cause these to seize up so that they are unable to accommodate any misalignment between opposite pillars 14 on the fill-in plates 24.
  • the trench lining system of Figure 4 includes a manhole box 30 with panels 32 which have a V cross-section.
  • the box may comprise panels 32a with a curved or arched cross-section.
  • the spacing between the lengthwise centres of the panels 32 has to be sufficient to accommodate the maximum diameter ring which is to be employed but the angling or curving means that the edges of the panels 32 can be closer together. As a result, there is a saving in excavation as shown by shaded portion 34.
  • the panels 32 may be formed by folding or bending or by welding two plates 36 together. In all cases their fabrication is cheaper than that of the manhole boxes 20 in which two fill-in plates 24 have to be connected to a panel 22. Further, less material is required which results in additional cost savings as well as a reduction in weight.
  • the panels 32 When formed by folding, the panels 32 may define an angle of, say, 120° between the opposite arms thereof such that, in use, the angle 38 between the arms and the vertical plane parallel to the trench line is about 30°.
  • the panels 32 are provided with connecting means including pillars 40 which may be of the type employed in known trench lining systems and angled adaptors 42 to which the struts 44, which connect and space the panels 32, are secured.
  • the angled adaptors 42 serve to position the struts 44 such that their axes are aligned with a line connecting the lengthwise centres of the panels 32. As a consequence, the strut axes are also aligned in the direction of maximum force thereon due to the soil behind the panels 32. Even if the angled adaptors 42 are not employed, the angling of the panels 32 reduces the effect of the pressure of the soil behind the panels 32 and, thus, the chance of bending or seizure of the struts 44.
  • the struts 44 may take various forms.
  • the strut is two-part comprising an externally threaded rod which is received within an internally threaded tube, the rod and tube having a clevis fitting at their free ends.
  • the strut 44 comprises two rod and tube fittings 46 positioned back to back and secured together by bolting together plates 48 on the ends of the tube.
  • the rods have similar plates 48 by which they may be bolted to a clevis fitting 50.
  • the clevis fitting 50 may have two lugs 52 with apertures 54 by way of which the fitting 50 is pinned, see 55, to a pillar 40. Additional angled arms 56 with rubber ends 58 may be provided either side of the lugs 52 to form a so-called "rocking plate".
  • the angled adaptor 42 will take the form suitable for the struts 44 to be employed.
  • the angled adaptor 42 may include a plate 60 for bolting to the plate 48 at the end of the strut 44 and, at the angled face, a clevis fitting 50 whereby it may be pinned, see 55, to a pillar 40.
  • the angled adaptors 42 are positioned between the panels 32 and the pillars 40. With the curved panels 32a, the adaptor 42 will include a curved face.
  • the illustrated embodiment has the advantage that the panels 32 can be formed by taking a standard trench lining panel 6 and folding or bending it, or alternatively dividing it into two parts and then welding the parts together at the desired angle. This is a particularly simple method of construction and is most cost effective.
  • the manhole box 30 is more efficient than known boxes, as illustrated in Figure 1, in terms of the amount of excavation required, material requirements and construction requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Sewage (AREA)
EP96304370A 1995-06-16 1996-06-11 Panneau de cage de blindage Withdrawn EP0748899A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9512324A GB2303392A (en) 1995-06-16 1995-06-16 Trenching apparatus
GB9512324 1995-06-16

Publications (1)

Publication Number Publication Date
EP0748899A1 true EP0748899A1 (fr) 1996-12-18

Family

ID=10776219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96304370A Withdrawn EP0748899A1 (fr) 1995-06-16 1996-06-11 Panneau de cage de blindage

Country Status (2)

Country Link
EP (1) EP0748899A1 (fr)
GB (1) GB2303392A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813282A1 (de) * 1998-03-26 1999-09-30 Richter Wolfgang Grabenverbauvorrichtung
WO2018006047A1 (fr) * 2016-06-30 2018-01-04 Quanta Associates, L.P. Boîte à cloche

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE764529A (fr) * 1971-03-19 1971-08-16 Belge Des Betons S A Soc Blindage d'une fouille pour coulee d'un mur souterrain en beton.
GB2259534A (en) * 1991-09-11 1993-03-17 Kenneth Victor Holder Shoring assembly

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE764529A (fr) * 1971-03-19 1971-08-16 Belge Des Betons S A Soc Blindage d'une fouille pour coulee d'un mur souterrain en beton.
GB2259534A (en) * 1991-09-11 1993-03-17 Kenneth Victor Holder Shoring assembly

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19813282A1 (de) * 1998-03-26 1999-09-30 Richter Wolfgang Grabenverbauvorrichtung
WO1999049144A1 (fr) * 1998-03-26 1999-09-30 Richter, Wolfgang Dispositif de coffrage de tranchee
US6474911B1 (en) 1998-03-26 2002-11-05 Wolfgang Richter Trench sheeting device
WO2018006047A1 (fr) * 2016-06-30 2018-01-04 Quanta Associates, L.P. Boîte à cloche
US20190323195A1 (en) * 2016-06-30 2019-10-24 Quanta Associates, Lp Bell hole box
US11021847B2 (en) 2016-06-30 2021-06-01 Quanta Associates, L.P. Bell hole box

Also Published As

Publication number Publication date
GB2303392A (en) 1997-02-19
GB9512324D0 (en) 1995-08-16

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