EP0338865B1 - Dispositif de blindage de tranchée - Google Patents

Dispositif de blindage de tranchée Download PDF

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Publication number
EP0338865B1
EP0338865B1 EP19890304022 EP89304022A EP0338865B1 EP 0338865 B1 EP0338865 B1 EP 0338865B1 EP 19890304022 EP19890304022 EP 19890304022 EP 89304022 A EP89304022 A EP 89304022A EP 0338865 B1 EP0338865 B1 EP 0338865B1
Authority
EP
European Patent Office
Prior art keywords
strut
shoring
spring
panel
cylinder
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.)
Expired
Application number
EP19890304022
Other languages
German (de)
English (en)
Other versions
EP0338865A1 (fr
Inventor
John Collins
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.)
Mabey Hire Co Ltd
Original Assignee
Mabey 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 Mabey Hire Co Ltd filed Critical Mabey Hire Co Ltd
Publication of EP0338865A1 publication Critical patent/EP0338865A1/fr
Application granted granted Critical
Publication of EP0338865B1 publication Critical patent/EP0338865B1/fr
Expired 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 apparatus for supporting the walls of trenches, or other excavations, and of the kind generally designated as a trench shoring box and comprised of two opposed shoring panels provided with vertically directed support members to which two opposite ends of struts of adjustable length, normally extending substantially perpendicularly to the shoring panels, are horizontally pivotally attached so that the shoring panels can be relatively displaceable in the vertical direction as excavation progresses.
  • FR-A-2 195 240 discloses - in Fig. 3 thereof and the related description - apparatus for supporting the walls of trenches, or other excavations, and of the kind generally designated as a trench shoring box and comprised of two opposed shoring panels provided with vertically directed support members to which two opposite ends of struts of adjustable length, normally extending substantially perpendicularly to the shoring panels, are horizontally pivotally attached so that the shoring panels can be relatively displaceable in the vertical direction as excavation progresses, wherein each strut is additionally resiliently coupled to the shoring panel by a leaf spring which is adapted to dampen angular movement between the strut and the panel, a portion of the leaf spring being secured to the end of the strut and extending perpendicularly thereto, a remote end of the leaf spring being connected to the shoring panel, the spring exerting damping action against deviations of the strut from its normal position substantially perpendicular
  • opposite halves of the leaf spring in Fig. 3 of FR-A-2 195 240 are prestressed to act in opposition to each other, so that any deviation of the panel from its normal angular position relative to the strut is aided by one half of the spring, which half depending upon the direction of the deviation, and opposed by the other half of the spring.
  • both halves of the spring are greatly curved, with a puzzling effect. It appears that the strut is constrained to pivot about the the pin at the centre of the boss in FR-A-2 195 240, so that there would be circumferential movement of the curved spring, moving one extreme end of the spring out of the associated slot and transferring the reaction to the adjacent bar. The other extreme end of the spring would be pushed deeper into the associated slot, also causing eventual reaction from the adjacent bar. Apparently there is no end stop to limit angular deviation.
  • leaf spring in Fig. 3 of FR-A-2 195 240 appears to be of spring steel and yet shown welded to the strut and not to the boss, which is not good practice.
  • the present invention has been devised with the general object of providing a damping system which does not have the above mentioned disadvantages.
  • each spring is substantially rectilinear, so that substantially the entire spring extends substantially parallel to the shoring panel, and in that substantially the entire spring opposes any deviation of the strut, in either direction, from its normal position in which the strut is substantially perpendicular to the panel.
  • Fig. 1 shows a heavy duty strong box strut which comprises a central cylinder 1 formed in two cylindrical parts A, B, with abutting flanges 2, 3 secured together by bolts 4 and nuts 5 and each formed from end to end internally with a quick feed screw thread 6.
  • a pair of thrust rods 9, 10 Retained within the cylinder parts A and B, are the correspondingly screw-threaded cylindrical heads 7, 8 of a pair of thrust rods 9, 10.
  • Attached to the outward end of each of these thrust rods 9, 10 is a perpendicular plate 13 which supports a central part of a multi-leaf spring 12 which is clamped thereto by a second plate 11 by means of bolts 14 and nuts 15, so that the leaf spring 12 extends perpendicularly to the strut.
  • each plate 11 Attached to the outward side of each plate 11 is a U-shaped saddle 16 by which the strut is swivelably mounted on an horizontal pin 17 which, as shown in Fig. 2, extends between a pair of end post plates or brackets 18 which project at right angles from a shoring panel 20, and which are part of an end post 19 fixed to the shoring panel 20 as shown in Fig. 4.
  • each leaf spring is located in slotted tubes 21 which are welded between the end post plates or brackets 18 of the side panel 20, these details being shown more clearly in Fig. 2, and also in Figs. 3 and 4.
  • the centre lines C of the struts are indicated in Fig. 4.
  • Rapid extending or retracting of each strut is effected by turning the cylinder 1 in a clockwise or counter-clockwise direction by use of any suitable tool such as for instance a lever arm inserted into one or other of four radial openings in a collar 22 which is welded to the cylinder part B.
  • Fig. 1 there is also illustrated by a chain-dashed line a lifting bracket which is attached only to the topmost extension strut.
  • the construction is of course such that none of the screw-threading is exposed in use to the environment in which the shoring box operates. Also, in the formation of the screw threading, the minimum amount of metal is removed from the cylinder parts A, B consistent with the maximum designed load-carrying capacity of the strut. This will provide greater local strength and will minimise the possibility of dents being formed in the cylinders during normal use of the struts.

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)
  • Springs (AREA)
  • Tents Or Canopies (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)

Claims (6)

1. Un dispositif de blindage de tranchées ou d'autres excavations, du type généralement appelé coffrage de soutènement de tranchée, composé de deux panneaux de soutènement opposés (20) comportant des éléments de support à orientation verticale, auxquels deux extrémités opposées d'étais de longueur réglable, s'étendant normalement de façon pratiquement perpendiculaire aux panneaux de soutènement (20) sont fixées horizontalement à pivotement, de sorte à permettre un déplacement relatif des panneaux de soutènement (20) dans la direction verticale lors de la progression de l'excavation, dans lequel chaque étai est en plus accouplé flexiblement au panneau de soutènement (20) par un ressort à lames (12) capable d'amortir le mouvement angulaire entre l'étai et le panneau (20), une partie du ressort à lames (12) étant fixée à l'extrémité de l'étai (1) et s'étendant perpendiculairement à celui-ci, une extrémité éloignée (21) du ressort à lames (12) étant fixée au panneau de soutènement (20), le ressort (12) exerçant une action d'amortissement contre les déviations de l'étai par rapport à sa position normale, pratiquement perpendiculaire au panneau de soutènement (22), caractérisé en ce que chaque ressort (12) est pratiquement rectiligne, de sorte que pratiquement l'ensemble du ressort (12) s'étend de façon pratiquement parallèle au panneau de soutènement (20), et en ce que pratiquement l'ensemble du ressort (12) s'oppose à toute déviation de l'étai, dans une direction quelconque, par rapport à sa position normale, dans laquelle l'étai est pratiquement perpendiculaire au panneau (20).
2. Un dispositif selon la revendication 1, dans lequel au moins quelques-uns des ressorts à lames (12) comprennent plusieurs lames de longueur et/ou d'épaisseur variable.
3. Un dispositif selon la revendication 2, dans lequel la rigidité de chaque ressort à lames peut être modifiée par une modification du nombre de lames.
4. Un dispositif selon les revendications 1, 2 ou 3, dans lequel les extrémités des ressorts à lames (12) s'engagent et sont agencés dans des tuyaux à fente (21) fixés indirectement aux panneaux de soutènement (20).
5. Un dispositif selon l'une quelconque des revendications 1 à 4, dans lequel chaque étai comprend un cylindre central à filet de vis intérieur (1) et une paire de tiges de vérin (9, 10), s'étendant chacune de chaque extrémité du cylindre (1) et ayant chacune, à l'intérieur du cylindre (1) une tête à filet de vis extérieur (7, 8), s'engageant dans les filets du cylindre (1), la rotation du cylindre (1) dans une direction ou dans l'autre entraînant ainsi une extension ou une contraction des tiges de vérin (9, 10) par rapport au cylindre, en vue de changer la longueur hors-tout de l'étai.
6. Un dispositif selon l'une quelconque des revendications précédentes, dans lequel une lame de protection en acier ductile est ajustée sur au moins un des ressorts à lames (12).
EP19890304022 1988-04-21 1989-04-21 Dispositif de blindage de tranchée Expired EP0338865B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8809439 1988-04-21
GB8809439A GB2217750B (en) 1988-04-21 1988-04-21 Apparatus for supporting the walls of trenches

Publications (2)

Publication Number Publication Date
EP0338865A1 EP0338865A1 (fr) 1989-10-25
EP0338865B1 true EP0338865B1 (fr) 1992-06-17

Family

ID=10635588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890304022 Expired EP0338865B1 (fr) 1988-04-21 1989-04-21 Dispositif de blindage de tranchée

Country Status (3)

Country Link
EP (1) EP0338865B1 (fr)
DE (2) DE338865T1 (fr)
GB (1) GB2217750B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2249114B (en) * 1990-10-22 1994-08-31 Mabey Hire Co Trench box for shoring
CN112746619A (zh) * 2020-12-19 2021-05-04 徐东新 一种可解决深浅基坑中坑偏压问题的内支撑结构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE755176A (fr) * 1969-11-08 1971-02-01 Krings Jozef Dispositif de blindage de tranchees pour canalisations
AT317782B (de) * 1972-08-04 1974-09-10 Krings Josef Gleitschuh für eine Spannvorrichtung einer Grabenverbauvorrichtung
CH559828A5 (fr) * 1972-08-04 1975-03-14 Krings Josef
DE2702750C3 (de) * 1977-01-24 1979-08-16 Josef 5138 Heinsberg Krings Gleitschuh für die Spanneinrichtung einer Gnfcenverbmivorrichtung
DE2832321C2 (de) * 1978-07-22 1982-10-14 Josef Ing.(grad) 5142 Hückelhoven Emunds Grobeinstellbarer Spannrahmen für Verbauplatten

Also Published As

Publication number Publication date
GB2217750B (en) 1992-04-08
GB8809439D0 (en) 1988-05-25
DE68901806D1 (de) 1992-07-23
DE68901806T2 (de) 1993-02-04
EP0338865A1 (fr) 1989-10-25
DE338865T1 (de) 1990-08-16
GB2217750A (en) 1989-11-01

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