GB2166774A

GB2166774A - Telescopic waling parts

Info

Publication number: GB2166774A
Application number: GB08428208A
Authority: GB
Inventors: John Harris
Original assignee: Mabey Hire Co Ltd
Current assignee: Mabey Hire Co Ltd
Priority date: 1984-11-08
Filing date: 1984-11-08
Publication date: 1986-05-14
Also published as: GB2166774B; GB8428208D0

Abstract

A telescopic waling system comprises a plurality of pivotally connectable telescopic units (A) each of which internally incorporates an hydraulically operable ram by which a movable end of the unit can be extended and retracted. Also there will normally be provided at least one fixed length extension piece (B), or a range thereof of differing standard lengths, adapted to be pivotally connected at each end to the telescopic units (A). <IMAGE>

Description

SPECIFICATION Telescopic waling system This invention is a telescopic waling system intended to support a sheet piling lining in an excavation whilst leaving a maximum of clear space for the operation of the excavation machinery.

The invention has been devised with the object also of providing a waling system which is easy to assemble and dismantle and which is readily adaptable to suit different sizes of excavation.

Thus in accordance with the invention there is provided a telescopic waling system comprising a plurality of pivotally connectable telescopic units each of which internally incorporates an hydraulically operable ram by which a movable end of the unit can be extended and retracted.

Component parts of a typical embodiment of the invention and its mode of use are illustrated in the accompanying drawings, in which: Figures 1 and 1A are side views of a telescopic unit respectively in a retracted and in an extended condition; Figures 7B and 1C are end views respectively in the directions of arrows B and C in Fig. 1; Figure 2 is a plan view showing a rectangular framework composed of four telescopic units; Figure 3 is a side view of a typical extension piece; Figures 3A and 3B are end views respectively in the direction of arrows A and B in Fig. 3; Figure 4A shows a retracted telescopic unit fitted with three respective extension pieces of different length; Figure 4B corresponding to Fig. 4A shows the same telescopic unit in its extended position, and Figure 5 is a perspective plan view showing the mode of use of the system.

The telescopic unit A shown by way of example in all the drawing Figures comprises an outer square section tubular casing 1 made of steel in which there is slidably received an inner element 2 formed from a universal steel column section. The latter has its web cut away and replaced by a steel tube 3 which forms a housing to an hydraulic ram which is attached at is ends by pin joints (not visible) so that it remains unaffected by any deflection of the telescopic unit under load. To one end of the casing 1 there is secured a single lug 4 and to the end of the element 2 there is secured a pair of parallel lugs 5 which are laterally offset from the element and spaced sufficiently apart to receive a lug 4 of an adjacent unit. The lugs 4 and 5 have apertures to enable adjacent units to be coupled together or to suitable extension pieces by heavy duty steel pins 6 as shown in Figs. 2 and 5.In this manner limited angular movement between coupled units is permitted. This allows the waling to follow the line of sheet piling which has not been accurately driven and also facilitates removal after use.

For extending the range of operation of the units A fixed length extension pieces are provided. As shown in Figs. 3, 3A and 3B each extension piece B comprises an I-section bar 7 with a pair of parallel apertured lugs 8 projecting from one end and a single laterally offset lug 9 at its other end which is closed off.

Fig. 4A shows three standard length extension pieces B, which may respectively be 1 metre, 2 metres and 3 metres in length or any intermediate length, connected to a retracted standard length telescopic unit A by a heavy duty steel pin through the lugs 5 and 9 and by bolts through holes in the end plates.

Fig. 4B shows the same telescopic units A and extension units B but with the former in its extended position.

Fig. 5 shows four chain-suspended telescopic units A coupled together to form a framework which is supporting a rectangular assembly of steel sheet piling P. The units A are connected by flexible piping (not shown) to a remotely situated hydraulic fluid pump. A system of valves in the piping enbables the lengths of the units to be adjusted either simultaneously or individually. The rams are double acting so that the units may be either extended or retracted. When adjustment is completed, isolating valves in the system are closed. This doubles the safety factor against hydraulic failure. Also the flexile pipes can easily be removed after the waling system has been set in position, without loss of hydraulic pressure in the rams.

A typical waling system as above described may be infinitely adjustable for use with excavations from approximately 2 metres to 6 metres square.

1. A telescopic waling system comprising a plurality of pivotally connectable telescopic units each of which internally incorporates an hydraulically operable ram by which a movable end of the unit can be extended and retracted.

2. A telescopic waling system as claimed in Claim 1 which further comprises at least one fixed length extension piece which is adapted to be pivotally connected at each end to said telescopic units.

3. A telescopic waling system as claimed in Claim 1 or Claim 2 in which the telescopic units are of square cross-section.

4. A telescopic waling system as claimed in any of the preceding claims in which each telescopic unit has a pair of spaced parallel apertured lugs extending from one end.

5. A telescopic waling system as claimed

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Telescopic waling system This invention is a telescopic waling system intended to support a sheet piling lining in an excavation whilst leaving a maximum of clear space for the operation of the excavation machinery. The invention has been devised with the object also of providing a waling system which is easy to assemble and dismantle and which is readily adaptable to suit different sizes of excavation. Thus in accordance with the invention there is provided a telescopic waling system comprising a plurality of pivotally connectable telescopic units each of which internally incorporates an hydraulically operable ram by which a movable end of the unit can be extended and retracted. Component parts of a typical embodiment of the invention and its mode of use are illustrated in the accompanying drawings, in which: Figures 1 and 1A are side views of a telescopic unit respectively in a retracted and in an extended condition; Figures 7B and 1C are end views respectively in the directions of arrows B and C in Fig. 1; Figure 2 is a plan view showing a rectangular framework composed of four telescopic units; Figure 3 is a side view of a typical extension piece; Figures 3A and 3B are end views respectively in the direction of arrows A and B in Fig. 3; Figure 4A shows a retracted telescopic unit fitted with three respective extension pieces of different length; Figure 4B corresponding to Fig. 4A shows the same telescopic unit in its extended position, and Figure 5 is a perspective plan view showing the mode of use of the system. The telescopic unit A shown by way of example in all the drawing Figures comprises an outer square section tubular casing 1 made of steel in which there is slidably received an inner element 2 formed from a universal steel column section. The latter has its web cut away and replaced by a steel tube 3 which forms a housing to an hydraulic ram which is attached at is ends by pin joints (not visible) so that it remains unaffected by any deflection of the telescopic unit under load. To one end of the casing 1 there is secured a single lug 4 and to the end of the element 2 there is secured a pair of parallel lugs 5 which are laterally offset from the element and spaced sufficiently apart to receive a lug 4 of an adjacent unit. The lugs 4 and 5 have apertures to enable adjacent units to be coupled together or to suitable extension pieces by heavy duty steel pins 6 as shown in Figs. 2 and 5.In this manner limited angular movement between coupled units is permitted. This allows the waling to follow the line of sheet piling which has not been accurately driven and also facilitates removal after use. For extending the range of operation of the units A fixed length extension pieces are provided. As shown in Figs. 3, 3A and 3B each extension piece B comprises an I-section bar 7 with a pair of parallel apertured lugs 8 projecting from one end and a single laterally offset lug 9 at its other end which is closed off. Fig. 4A shows three standard length extension pieces B, which may respectively be 1 metre, 2 metres and 3 metres in length or any intermediate length, connected to a retracted standard length telescopic unit A by a heavy duty steel pin through the lugs 5 and 9 and by bolts through holes in the end plates. Fig. 4B shows the same telescopic units A and extension units B but with the former in its extended position. Fig. 5 shows four chain-suspended telescopic units A coupled together to form a framework which is supporting a rectangular assembly of steel sheet piling P. The units A are connected by flexible piping (not shown) to a remotely situated hydraulic fluid pump. A system of valves in the piping enbables the lengths of the units to be adjusted either simultaneously or individually. The rams are double acting so that the units may be either extended or retracted. When adjustment is completed, isolating valves in the system are closed. This doubles the safety factor against hydraulic failure. Also the flexile pipes can easily be removed after the waling system has been set in position, without loss of hydraulic pressure in the rams. A typical waling system as above described may be infinitely adjustable for use with excavations from approximately 2 metres to 6 metres square. CLAIMS

4. A telescopic waling system as claimed in Claim 4 in which the pair of parallel lugs on each of the telescopic units and each of the extension pieces are laterally offset from the telescopic unit and extension piece.

5. A telescopic waling system as claimed in Claim 4 in which the pair of parallel lugs are laterally offset from the telescopic unit.

6. A telescopic waling system as claimed in Claim 2 in which a plurality of said extension pieces of different standard sizes is provided.

7. A telescopic waling system substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.

8. A telescopic unit for telescopic waling system substantially as hereinbefore described with reference to, and as shown in, Figs. 1, 1A, 1B and 1C of the accompanying drawings.

9. An extension piece for a telescopic waling system substantially as hereinbefore described with reference to, and as shown in, Figs. 3, 3A and 3B of the accompanying drawings.

CLAIMS Amendments to the claims have been filed, and have the following effect: (a) Claims 1-5 above have been deleted.

(b) New or textually amended claims have been filed as follows:

1. A telescopic waling system comprising a plurality of pivotally connectable telescopic units each of which internally incorporates an hydraulically operable ram by which a movable end part of the unit can be extended and retracted, and extension pieces which are adapted to be connected at one end to said telescopic units by means of pins which are insertable through aligned transverse openings of lugs which are situated at the ends of both the telescopic units and each extension piece, whereby the waiting can be extended to fit any particular size of excavation.

2. A telescopic waling system as claimed in Claim 1 in which the telescopic units are of square cross-section.

3. A telescopic waling system as claimed in Claim 1 or 2 in which each telescopic and each extension unit has a pair of spaced parallel apertured lugs extending from one end, and a single apertured lug extending from its other end.