GB1563239A - Bridge constructional techniques - Google Patents
Bridge constructional techniques Download PDFInfo
- Publication number
- GB1563239A GB1563239A GB43210/76A GB4321076A GB1563239A GB 1563239 A GB1563239 A GB 1563239A GB 43210/76 A GB43210/76 A GB 43210/76A GB 4321076 A GB4321076 A GB 4321076A GB 1563239 A GB1563239 A GB 1563239A
- Authority
- GB
- United Kingdom
- Prior art keywords
- construction girder
- bridge
- girder
- construction
- crane
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
Description
(54) IMPROVEMENTS IN AND RELATING TO BRIDGE
CONSTRUCTIONAL TECHNIQUES
(71) We, CANDAC CONSTRUC
TION (Pty) LIMITED, formerly known as
Christiani & Nielsen (Itty) Limited, a
Company organised under the laws of the
Republic of South Africa, of Marine Drive,
Woodstock, Cape Town, Republic of South
Africa do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention concerns improvements in and relating to constructional techniques, more particularly constructional techniques in relation to bridge building. The invention provides both a method and apparatus for bridge building.In the context of this specidication the term "bridge" is used in a very broad signification as including any elevated extended structure, thus including not only bridges for any purpose but also aqueducts, viaducts and the like. The method and apparatus of the invention are particularly well adapted to constructing particularly long bridges. For example this requirement can arise where it is desired to extend a bridge across a broad river, an estuary or a shallow sea to a loading base. In such projects, for example, a bridge superstructure is supported on substructure comprising piers which may be built on a pile foundation or may be constituted by extending piles themselves upwardly to pile caps, the bridge superstructure spanning the gap between the substructure pile.Where the length of such a bridge may for example be measured in kilometres the speed at which the bridge can be built becomes important and it becomes desirable to have a method and apparatus which allows a high rate of construction, that is to say a high rate at which each cycle of construction is completed, a cycle for example comprising erecting one pier and extending the bridge superstructure to span across to that pier, followed by the next cycle comprising erecting the next pier and placing the next superstructure span and so on.
According to the present invention there is provided a method of extending a bridge structure over ground not provided with supporting piers, said method comprising the steps of placing a construction girder on a portion of the bridge structure which is to be extended, advancing the construction girder so as to project beyond the end of the bridge structure as a cantilever, the construction girder having at or near the cantilever end a leg arranged to be lowered so that it reaches the ground, lowering the leg until it rests on the ground and supports the construction girder, providing at least one pier structure on the ground in a position to support the cantilever end of the construction girder and for ultimately supporting a deck structure of the bridge structure, raising the leg out of contact with the ground and allowing the construction girder to rest on the newly provided pier structure, and thereafter providing at least part of the deck structure extending on to the newly provided pier structure alongside the construction girder.
In the context the term ground will of course be understood to include not only dry ground but also and probably more commonly the bed of a river, estuary or shallow sea and the like. Whereas a single leg is referred to as the minimum a common arrangement will be to use two legs at the end of the construction girders.
It is a characteristic feature of the preferred embodiment of this invention that the construction girder may be advanced by means of motive power of a crane which is used on the construction girder, and is located during the advancing in a position remote from the cantilevered end of the construction girder, by using a cable joined to the crane hoist to shorten the distance between fixed points on the construction girder and the newly provided pier structure respectively.
The method may include the further step of moving the construction girder from alongside said part of the deck structure, and thereafter providing a further part of the deck structure in the position from which the construction girder has been moved.
The crane is used for a multitude of other tasks in the building of the bridge structure.
The preferred arrangement is that the cable passes from the crane hoist over a sheave fixed to the construction girder and extends to a pier structure at a position in advance of the position of the sheave on the construction girder. With this arrangement the crane remains stationary on the construction girder but moves with the construction girder as the construction girder advances. Alternative arrangements of the cable could of course be employed whereby the crane remains stationary relative to the pier structure with the construction girder advancing underneath the crane. In either way the essential advantage is achieved that the crane is kept remote from the cantilevered end.
In the preferred embodiment of the invention the crane is furthermore preferably employed to lower and to raise the leg from a remote position by means of a cable extending from the crane hoist via sheaves to the position of the leg, where the cable is suitably connected. In this way fast lowering and raising of the leg is achieved.
As the construction of the bridge proceeds the components for providing a pier structure are transported along the bridge structure, the components are stored temporarily on the construction girder and then are moved to the end of the construction girder supported by the leg for installation.
The pier structure may include piles which may either constitute the pier structure themselves with pile caps being placed on them for supporting the deck structure or else they may form the foundation for construction of pier structures in other ways. The deck structure may comprise a plurality of beams arranged to span between support members mounted on the newly provided pier structure.
It may be preferable to provide a bracing strut which is temporary installed in a manner such as to assist an existing pier structure of the bridge structure carry horizontal loads imparted to it as a result of the forces necessary to advance the construction girder.
It may be mentioned that the leg may be provided with a foot which is selected in accordance with the condition of the ground on which the foot will rest while supporting the construction girder. Thus in shallow seas where the bottom is soft and muddy a particularly broad foot will be necessary to achieve the necessary support while on rocky
surfaces a narrow foot can be used.
The invention may also provide apparatus for use in extending a bridge structure over ground not provided with supporting piers, said apparatus comprising a construction girder arranged to be supported on a portion of the bridge structure which is to be extended in a manner such that the construction girder can be advanced so as to project beyond the end of the bridge structure as a cantilever, means for advancing the construction girder so that it extends beyond the end of the bridge structure as a cantilever the construction girder having at or near the cantilever end a leg arranged to be lowered so that it reaches the ground, means for lowering the leg so that it rests on the ground and supports the construction girder, together with means for providing at least one pier structure for supporting the cantilever end of the construction girder and for ultimately supporting a deck structure of the bridge structure, means for raising the leg and allowing the construction girder to rest on such a newly-provided pier structure, and means for providing at least part of the deck structure extending on to the newly provided pier structure alongside the construction girder.
The aperture may include means for providing a further part of the deck structure in the position occupied by the construction girder.
The preferred embodiments of the invention furthermore provide apparatus for carrying out the preferred embodiments of the method of this invention.
The invention will be more fully described, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a side elevation of apparatus in accordance with this invention shown in the process of extending a bridge structure,
Figure 2 is a plan view of the apparatus and bridge structure shown in Figure 1,
Figure 3 is a cross sectionar elevation of the construction girder and bridge structure shown in Figure 1 (on sectionA--A of
Figure 1) on a larger scale,
Figure 4 is a front elevation of the construction girder shown in Figure 1,
Figure 5 shows the construction girder and bridge structure of the preceding figures schematically in a series of five steps which illustrate sequentially one cycle in the process of extending the bridge structure,
Figure 6 is a side elevation of apparatus in accordance with an alternative embodiment of the invention and a bridge structure, and
Figure 7 is a plan view of the apparatus shown in Figure 6.
Referring to the drawings, as shown in
Figures 1, 2, 3 and 4 the construction girder is a long plate girder extending from its rearmost end 1 to its advance end 2, the girder being strongly braced and trussed. The construction girder comprises a part extending from the rearward end 1 to a position indicated at 3 which is arranged to overlap with the bridge superstructure which in this example is basically constituted by box girders 4 which span the distance between the piers 5 of the bridge substructure which are constituted by the piles which are driven into the sea bottom 6. The average sea level is indicated by the line 7. The piles 5 are completed by means of pile caps 8 upon which the box girders 4 rest.
The construction girder is shown at a stage in the process of extending the bridge structure immediately prior to advancing the construction girder so as to project beyond the bridge substructure as a cantilever.
The end 2 of the construction girder carries two legs 9 in the manner shown, each leg having a foot lOa for resting on the sea bottom which in this case is presumed to be a fairly soft mud.
Further devices to be used in making the bridge structure include primarily a crane 10 which rides on the construction girder 1-2, two beam gantries 11 and 12, a pile guide 13, a pile hammer 14 and carrier bogies 16.
A crane 10 is used both for advancing the construction girder and for lowering the legs 9 as well as for other general duties particularly transporting the piles 5 from their storage position as indicated at 5a on the construction girder to the position at which they are driven, transporting the pile guide, the hammer and other components. The beam gantries are used for moving up the bridge superstructure beams 4 after they have been transported on the carrier bogies 16 up to the rearward end 1 of the construction girder, the beam gantries taking them to a position from which they can be lowered onto the pile caps 8.
Turning to a more detailed description, the bridge substructure piers are constituted by pairs of piles 5, each pair comprising two piles 5 with a pile cap 8 over the top, and the pairs of piles being spaced forty metres apart. However every third pair of piles is provided with a third bracing pile 5b to provide stiffness in a longitudinal direction.
Each of the pile caps supports the bridge superstructure box girders 4. In addition the pile caps 8 temporarily carry rollers 18 from which the construction girder rolls, suitable rails 46 being provided on an underneath surface of the construction girder for this purpose.
The construction girder 1-2 is entirely enclosed by the bracing struts and ties in the portion 3-2 but separates to two parallel arms in the portion 1-3 so as to permit the overlapping of the bridge superstructure. The arms of the portion 1-3 also carry piles indicated here as 5a which will later be moved up by the crane 10 for placing as next pair of piles for the substructure. In this example the construction girder also comprises prestressed strands 19 passing over a tower 20 to provide additional stiffness and strength to the advance end of the construction girder for when it is cantilevered. The two parallel arms of the portion 1-3 of the construction girder are provided with a tail brace 20a which may be temporarily erected during the advancing of the construction girder as a brace for these portions.However the tail brace 20a is not essential and alternative arrangements could be provided for. The advance end of the construction girder carries platforms 21 for the support of the legs 9.
A fixed point 22 is provided on each pile cap 8, being the second last constructed pile cap in the view of figure 1 for connection of the cable 23 which passes over a sheave 24 which is fixed to the construction girder near the position 3, the end of the cable 23 being connected to the hoist 23 of the crane 10.
This is for the purpose of advancing the construction girder which is done with the motors of the crane 10, raising the hoist 25 and thereby moving the sheave 24 towards the fixed point 22, thereby advancing the construction girder. The crane moves with the construction girder. A further pair of cables (not shown in figures 1 and 2) is provided for connection to the cable 23 which is then released from the fixed point 22, these cables extending to sheaves 27 in the region of the legs 9 and extending over further sheaves 28 downwardly to sheaves 29 located at the bottom of each leg 9 with the axis of the sheave 29 in each case-coinciding with the line of action of the centre of weight of each each leg, the cables then extending upwardly to a fixed point on the construction girder.
In this way the crane 10 can be employed to lower the legs 9 and raise them. Each of the legs 9 however is further provided with hydraulic jacking means so as to take part of the weight of the construction girder onto the legs and to raise the construction girder up to the correct level at its advance end 2.
These comprise hydraulic jacks 30 acting on plates 31 which are welded to the legs in a manner analogous to the teeth of a rack extended along the length of the legs. The jacks 30 operate jacking plates 32. A set of two hydraulic rams and one jacking plate is located on each side of each leg and the jacking plates 32 are alternatively engaged with the plates 31 and disengaged with them so as to progressively jack up the construction girder on the legs 9. During each return stroke of the hydraulic cylinders 30 a locking plate 33 is provided on each side of each leg to take the strain when the jacking plates 32 are disengaged. A suitable mechanism (not shown) is used for moving the jacking plates 32 and the locking plates 33 into and out of engagement with the plates 31 which serve as teeth along the length of the legs 9.A lowermost plate 31a is provided on each leg 9 for locking the legs in the raised position.
The crane 10 rides along rails 35 on the construction girder, located directly over the plates 36 which constitute the main structural
components of the construction girder. The
crane can thus ride along the full length of
1-2 of the construction girder. The beam
gantries 11 and 12 also ride on the rails 35
whereas the bogies 16 ride on rails 36 which
are provided on the bridge superstructure box
girders 4. The roadway area 37 of each box
girder 4 is used for normal wheel type of
transport for bringing up the piles 5a. A pier
bracing strut 38 is shown in Figure 2 stowed
against the side of the construction girder.
This will be placed in position between piles
5 of adjacent piers in order to provide bracing
in those cases when the cable 23 is fixed to
the point 22 on a pair of piles which do not
have a longitudinal bracing pile Sb.
The method will be described in relation
to Figure 5 in which five illustrations are
used to illustrate successive stages of one
cycle of the method. The sea bottom 6 and
the sea level 7 are again shown with bridge
substructure comprising piles 5 and Sa driven
into the sea bottom at suitable distance. For
example, in a particular application, the piles
may be driven twenty metres into the sea
bottom. Each of the pairs of piles has the
pile cap 8 placed on it.The bridge super
structure has been basically erected by the
provision of the box girders 4 up the stage
shown in Figure 5 > (a). The construction girder
1-2 rests on the pile caps 8, overlapping
a part of the bridge superstructure 4 and
carrying on it the crane 10, the power hammer
14, pile guide 13, legs 9 and gantries 11 and
12 as well as other constructional equipment
and components for building the bridge which
are not shown. Additional piles 5a are shown
resting on the construction girder 1-2. At
this stage the crane hoist 25 is connected to
the cable 23 which passes over a sheave 24
which is fixed to the construction girder 1-2, the end of the cables 23 being fixed to the
pile cap 8 at the fixed point 22.The crane
10 is then operated raising the hoist 25 and thereby advancing the construction girder to
the position shown in Figure 5(b). As will be
seen the advance end 2 of the construction
girder projects beyond the bridge substructure as a cantilever. With the legs 9 in the initial raised position as shown by the broken lines
9' in Figure 5(b) the legs are lowered to the position 9. This supplies support to the end 2 of the construction girder 1-2. Near the opposite end 2 of the construction girder construction which extends the superstructure of the bridge is proceeding: bogies 16 are bringing up a bridge box girder 4 towards the gantries 11 and 12.When the legs 9 have been lowered and have been firmly jacked into the bottom 6 of the sea so as to properly take the part of the weight of the construction girder the crane 10 is used to bring the pile guide 13 and the power hammer 14 up to the end 2 of the construction girder as is shown in Figure 5(c). Also the crane 10 then brings the pile Sa and places it in the pile guide 13. At the same time the superstructure box girder 4 is being transferred from the bogies 16 to -rhe gantries 11 and 12 in the manner shown.
As shown in Figure 5(d) the pile 5a is being driven into the sea bottom 6 and the gantries 11 and 12 have brought the new box girder 4 up to a position from which it can be lowered onto the pile caps 8; the crane 10 is meanwhile busy bringing up further equipment such as additional piles and the like.
In Figure 5(e) the position is shown which corresponds to the position shown in Figure 5(a) but advanced one span along. This thus completes one cycle of the construction which is then about to commence so as to build another span of the bridge structure.
Naturally many other operations proceed,
but the above describes the main operations in the process.
Figures 6 and 7 illustrate one alternative adaptation of the invention where the bridge being constructed differs from that shown in the preceding figures primarily in that the piers are not formed by the piles themselves but are built on top of a piled foundation and
in that the girders of the bridge are not a
single box girder but a set for example of
five prestressed concrete beams. Thus corres
ponding items are illustrated with the same
reference numerals as in the preceding figures
and the description hereunder will concentrate
mainly on the features of difference. The con
struction girder 1-2 again has the portion
1-3 which is to overlap with the at least partly constructed bridge superstructure.
Thus as will be seen particularly in Figure
7 the five superstructure beams 4a, 4b, 4c,
4d and 4e have been placed on the bridge
piers 5' which are in turn built upon any
suitable number of piles 5" driven into the
sea bottom 6. The portion 1-3 of the con strucrion girder comprises two parallel arms
which are located between rhe bridge beams
4b, 4c and 4c, 4d. Again a track 35 runs
throughout the length 1-2 of the construction
girder upon which the crane 10 may run.
Again as an example of a potential variation
instead of the two beam gantries 11 and 12
a structure is provided comprising towers 40
which support transverse gantry beams 41
upon which a longitudinal movable beam 42
located by means of suitable wheels running
on tracks on the beams 41. The beam 42 is
used to lower hoists for the purpose of lifting,
moving and placing the bridge beams 4a, 4b,
4c and 4e. The towers 40 are made high
enough so that the crane 10 can pass under
the structure, at least when its jib is not raised
to its full height.
WHAT WE CLAIM IS:
1. A method of extending a bridge structure
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (29)
1-3 which is to overlap with the at least partly constructed bridge superstructure.
Thus as will be seen particularly in Figure
7 the five superstructure beams 4a, 4b, 4c,
4d and 4e have been placed on the bridge
piers 5' which are in turn built upon any
suitable number of piles 5" driven into the
sea bottom 6. The portion 1-3 of the con strucrion girder comprises two parallel arms
which are located between rhe bridge beams
4b, 4c and 4c, 4d. Again a track 35 runs
throughout the length 1-2 of the construction
girder upon which the crane 10 may run.
Again as an example of a potential variation
instead of the two beam gantries 11 and 12
a structure is provided comprising towers 40
which support transverse gantry beams 41
upon which a longitudinal movable beam 42
located by means of suitable wheels running
on tracks on the beams 41. The beam 42 is
used to lower hoists for the purpose of lifting,
moving and placing the bridge beams 4a, 4b,
4c and 4e. The towers 40 are made high
enough so that the crane 10 can pass under
the structure, at least when its jib is not raised
to its full height.
WHAT WE CLAIM IS:
1. A method of extending a bridge structure
over ground not provided with supporting
piers, said method comprising the steps of
placing a construction girder on a portion of
the bridge structure which is to be extended,
advancing the construction girder so as to
project beyond the end of the bridge structure
as a cantilever, the construction girder having
at or near the cantilever end a leg arranged
to be lowered so that it reaches the ground,
lowering the leg until it rests on the ground
and supports the construction girder, provid
ing at least one pier structure on the ground
in a position to support the cantilever end
of rhe construction girder and for ultimately
supporting a deck structure of the bridge
structure, raising the leg out of contact with
the ground and allowing the construction
girder to rest on the newly provided pier
structure, and thereafter providing at least
part of the deck structure extending on to
the newly provided pier structure alongside
the construction girder.
2. A method as claimed in Claim 1,
including the steps of moving the construction
girder from alongside said part of the deck
structure, and thereafter providing a further
part of the deck structure in the position from
which the construction girder has been moved.
3. A method as claimed in Claim 2, wherein
the construction girder is moved from along
side said part of the deck structure by
advancing the construction girder so as to project beyond the end of said part of the deck structure as a cantilever.
4. A method as claimed in Claim 3,
including the step of lowering the leg until
it rests on the ground, followed by the sub
sequent steps defined in Claim 1 to provide a further extension of the bridge structure.
5. A method as claimed in any preceding claim, wherein the construction girder is
advanced by a crane located in a position on the bridge structure remote from the cantilevered end of the construction girder using a cable joined to the crane hoist.
6. A method as claimed in Claim 5, wherein
the cable passes from the crane hoist over a sheave fixed to the construction girder and extends to a pier structure at a position in advance of the position of the sheave on the construction girder.
7. A method as claimed in any preceding claim, wherein the leg is lowered and raised by a crane located in a position on the bridge structure remote from the cantilevered end of the construction girder using a cable extending from the crane hoist via sheaves to the position of the leg, where the cable is suitably connected.
8. A method as claimed in any preceding claim, wherein components for providing a pier structure are transported along the bridge structure, the components are stored temporarily on the construction girder and are then moved to the end of the construction girder supported by the k - for installation.
9. A method as claimed in any preceding.
claim wherein the pier structure comprises piles upon which a pile cap is supported, upon which the deck structure is subsequently supported.
10. A method as claimed in any preceding claim, wherein the deck structure, comprises a plurality of beams arranged to span between support members mounted on the newly provided pier structure, and the beams and support members are transported to the construction girder and then moved along the construction girder to positions from which they can then be lowered on to the newly provided pier structure.
11. A method as claimed in any preceding claim, wherein as a step preliminary to the advancing of the construction girder, a bracing strut is temporarily installed in a manner such as to assist an existing pier structure of the bridge structure carry horizontal loads imparted to it as a result of the forces necessary to advance the construction girder.
12. A method as claimed in any preceding claim wherein as a step preliminary to lowering the leg a foot is selected for the leg and attached, the selection being in accordance with the condition of the ground on which the foot will rest while supporting the construction girder.
13. A method of extending a bridge structure substantially as herein described.
14. A bridge structure extended by the method claimed in any one of the preceding claims.
15. An apparatus for use in extending a bridge structure over ground not provided with supporting piers, said apparatus comprising a construction girder arranged to be supported on a portion of the bridge structure which is to be extended in a manner such that the construction girder can be advanced so as to project beyond the end of the bridge structure as a cantilever, means for advancing the construction girder so that it extends beyond the end of the bridge structure as a cantilever the construction girder having at or near the cantilever end a leg arranged to be lowered so that it reaches the ground, means for lowering the leg so that it rests on the ground and supports the construction girder, together with means for providing at least one pier structure for supporting the cantilever end of the construction girder and for ultimately supporting a deck structure of the bridge structure, means for raising the leg and allowing the construction girder to rest on such a newly-provided pier structure, and means for providing at least part of the deck structure extending on to the newly provided pier structure alongside the construction girder.
16. An apparatus as claimed in Claim 15, including means for providing a further part of the deck structure in the position occupied by the construction girder.
17. An apparatus as claimed in Claim 15 or Claim 16, wherein the means for advancing the construction girder include a crane arranged to ride along the length of the construction girder.
18. An apparatus as claimed in any one of
Claims 15 to 17, wherein the means for advancing the construction girder include a cable, cable connection points on the construction girder and on the deck structure
arranged for connection of the cable, one of the connection points including a sheave
arranged so that the cable can be tensioned
to shorten the distance between the connection
points and so advance the construction girder.
19. An apparatus as claimed in Claim 18,
wherein the cable is connected to a hoist of a
crane mounted on the construction girder and
is arranged to be tensioned by the crane.
20. An apparatus as claimed in Claim 18
of Claim 19, wherein the sheave is mounted on the construction girder.
21. An apparatus as claimed in any one of
Claims 15 to 20, wherein the means for raising and lowering the leg comprises a cable connected to the leg.
22. An apparatus as claimed in Claim 21, wherein the cable is connected via suitably placed sheaves to a hoist of a crane, so that the crane may be operated to raise and lower the leg.
23. An apparatus as claimed in any one of
Claims 15 to 22, wherein the means for providing at least part of the deck structure include a gantry crane arranged to lift and to support a deck structure unit arranged to span two adjacent pier structures, and to lower the deck structure unit into position on the pier structures, the gantry being supported on the construction girder.
24. An apparatus as claimed in any one of
Claims 15 to 23, wherein the construction girder also provides temporary storage space for components of at least one pier structure.
25. An apparatus as claimed in any one of Claims 15 to 24, including at least one pier structure bracing strut arranged to assist an existing pier structure carry horizontal loads imparted to it when the construction girder is advanced.
26. An apparatus as claimed in any one of
Claims 15 to 25, wherein the leg is provided with a foot at its lower end arranged to rest on the ground, and removably connected to the leg.
27. Apparatus substantially as hereinbefore described with reference to Figures 1 to 4 of the accompanying drawings.
28. Apparatus substantially as hereinbefore described with reference to Figures 6 and 7 of the accompanying drawings.
29. A bridge structure extended by using the apparatus claimed in any one of Claims 15 to 28.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA765834A ZA765834B (en) | 1976-09-29 | 1976-09-29 | Improvements in and relating to constructional techniques with particular reference to bridges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1563239A true GB1563239A (en) | 1980-03-19 |
Family
ID=25570783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB43210/76A Expired GB1563239A (en) | 1976-09-29 | 1976-10-18 | Bridge constructional techniques |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU506063B2 (en) |
| GB (1) | GB1563239A (en) |
| ZA (1) | ZA765834B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2520718A1 (en) * | 1982-02-03 | 1983-08-05 | Montcocol | Gantry for construction of temporary bridge - has vertically sliding cross-member with adjustable length actuated by jack |
| NL1008009C2 (en) | 1998-01-12 | 1999-07-13 | Heerema Elevated Infrastructur | Method for the construction of a track at a distance above ground level for rail transport, road transport or the like, and track obtained by applying the method. |
| NL1012565A1 (en) | 1999-07-12 | 2001-01-15 | Heerema Elevated Infrastructur | Method for the construction of a track for rail transport, road transport or the like, and track obtained by applying the method. |
-
1976
- 1976-09-29 ZA ZA765834A patent/ZA765834B/en unknown
- 1976-10-15 AU AU18747/76A patent/AU506063B2/en not_active Expired
- 1976-10-18 GB GB43210/76A patent/GB1563239A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2520718A1 (en) * | 1982-02-03 | 1983-08-05 | Montcocol | Gantry for construction of temporary bridge - has vertically sliding cross-member with adjustable length actuated by jack |
| NL1008009C2 (en) | 1998-01-12 | 1999-07-13 | Heerema Elevated Infrastructur | Method for the construction of a track at a distance above ground level for rail transport, road transport or the like, and track obtained by applying the method. |
| NL1012565A1 (en) | 1999-07-12 | 2001-01-15 | Heerema Elevated Infrastructur | Method for the construction of a track for rail transport, road transport or the like, and track obtained by applying the method. |
Also Published As
| Publication number | Publication date |
|---|---|
| AU506063B2 (en) | 1979-12-13 |
| AU1874776A (en) | 1978-04-20 |
| ZA765834B (en) | 1977-10-26 |
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