WO2011023884A2

WO2011023884A2 - Pylon for producing an engineering structure

Info

Publication number: WO2011023884A2
Application number: PCT/FR2010/051715
Authority: WO
Inventors: Paul Poirier
Original assignee: Paul Poirier
Priority date: 2009-08-26
Filing date: 2010-08-13
Publication date: 2011-03-03
Also published as: WO2011023884A3; FR2949495A1; FR2949495B1

Abstract

The invention relates to a pylon (2) for producing an engineering structure, characterized in that it includes at least three masts (4, 5, 6, 7) distributed about a vertical central axis (A), each of said masts having an upper end and a lower end connected to the ground, said masts being connected together in the vicinity of the upper ends thereof, said upper ends being closer to each other than the lower ends, each of said masts being bowed with the concavity thereof facing said central axis, said pylon including at least three stays (8, 9, 10, 11), each of the masts being respectively connected to one of said stays extending from the vicinity of the upper end of the mast to the ground or to the lower end of the mast, wherein said pylon further includes a supporting device which supports said stays remotely from said masts, more remotely from the central axis than said masts, said pylon including a load connected to said masts.

Description

Pylon for the realization of works of art

Technical field of the invention

The present invention relates to a pylon for the construction of a structure.

State of the art

Many types of pylons for the realization of works of art have been proposed. Each type of pylon is designed according to the constraints of a given application.

A ferry bridge is a bridge in which pylons carry a high bridge, under which moves a nacelle. This type of bridge is particularly interesting in the estuary cities, because it allows a cohabitation between the maritime and river traffic with strong draft and the land traffic to cross the river. For this type of bridge, it is desirable that the high pylons have good wind resistance, are able to withstand a large payload, and have an optimal aesthetic, with high visual transparency.

However, the existing pylons do not respond satisfactorily to all these criteria, difficult to reconcile. The pylons metal structure, made with the technology used in particular for the Eiffel Tower, involve expensive maintenance and have little flexibility in torsion. Pylons in metal drums require large sections to resist buckling. The pylons in concrete drums have a massive character and are oversized to support, in addition to the payload, their significant weight.

Summary of the invention

A problem that the present invention proposes to solve is to provide a pylon which does not have at least some of the disadvantages of the aforementioned prior art. In particular, an object of the invention is to propose a pylon which has a good ratio between the payload that it can carry and its own weight.

The solution proposed by the invention is a pylon for the construction of a structure, of the type comprising at least three masts distributed around a central vertical axis, each of said masts having an upper end and a lower end, the latter being connected to the ground, said masts being connected together in the vicinity of their upper ends, said upper ends being closer to each other than said lower ends, said tower comprising at least three stay cables, each of said masts being respectively connected to one said stays extending from the vicinity of the upper end of the mast to the ground or the lower end of the mast, characterized in that each of said masts is arcuate with its concavity facing said central axis, in that said pylon comprises a holding device which maintains said stay cables at a distance from said masts, further from said central axis than said masts, and in that said tower comprises a load connected to said masts.

Thanks to these characteristics, in a plane defined by a mast and the associated stay, the buckling of the mast is determined by the balance of force between the load and the tension in the stay. We can therefore speak of a mast with controlled buckling. The masts being distributed around the central axis and connected together, the stability of the pylon is ensured. The masts must not have a large section to ensure the stability of the pylon. The pylon can therefore have a low self-weight compared to the load it supports.

Preferably, the masts are made of concrete and the cable guy wires.

Advantageously, said holding device comprises at least one yard extending between one of said poles and one of said stays.

According to one embodiment, at least one of said masts has a buckling of between 5% and 10%.

According to one embodiment, the pylon comprises four masts whose lower ends are arranged at the four corners of a rectangle.

The invention also proposes a bridge comprising two pylons carrying a bridge, at least one of said pylons being a pylon according to the invention above, wherein said load comprises said gateway. It may be for example a transhipment bridge.

Brief description of the figures

The invention will be better understood, and other objects, details, features and advantages thereof will become more apparent in the following description of a particular embodiment of the invention. the invention, given solely for illustrative and non-limiting, with reference to the accompanying drawings. On these drawings:

FIG. 1 is a perspective view of a bridge comprising two towers according to one embodiment of the invention, and FIG. 2 is a side view of one of the towers of FIG. 1.

Detailed description of an embodiment of the invention

Figure 1 shows, in perspective, a transhipment bridge 1 which comprises two pylons 2 carrying a bridge 3, and a nacelle. The nacelle is suspended at the bridge 3 and can move under the bridge 3.

The two pylons 2 are made identically. Below is described in more detail the right-hand pylon 2 of Figure 1, which is also shown, viewed from the side, in Figure 2.

The tower 2 comprises four poles 4 to 7. Each of the poles 4 to 7 has an upper end 14 and a lower end 15. The lower ends 15 are fixed to the ground, respectively to the four corners of a rectangle centered on a vertical axis A . In the vicinity of their upper ends 14, the masts 4 to 7 are interconnected. Thus, the masts 4 to 7 have a bow-bent shape, with a convexity turned away from the axis A.

Pylon 2 also includes four stays 8 to 11, each associated with one of the respective masts 4 to 7. For example, the stay 8 extends from the upper end 14 of the mast 4 to its lower end 15. Alternatively, the stay 8 could extend from the upper end 14 of the mast 4 to the ground, in the vicinity the lower end 15 of the mast 4. The stays 9 to 11 are connected in the same way to the masts 5 to 7, respectively.

The pylon 2 also comprises a holding device which keeps the stays 8 to 11 away from the masts 4 to 7. For example, the stay 8 is kept at a distance from the mast 4, the convex side of the mast 4, that is to say ie, the opposite of the axis A. It can therefore be said that the stay 8 is extradossed to the mast 4. Similarly, the stays 9 to 1 1 are extradossed to the masts 5 to 7, respectively.

It can be seen in Figure 2 that the aforementioned holding device is constituted by yards 12 of trapezoidal shape. More specifically, a first series of yards 12 each have a small base connected to the masts 4 and 5 and a large base connected to the stays 8 and 9. Each yard 12 is arranged substantially horizontally and has dimensions adapted to the distance mast-stay to maintain. A second series of yards 12 maintain the stays 10 and 1 1 away from the masts 6 and 7. Of course, alternatively, the holding device could be made differently, for example with yards of another form.

The bridge 3 is fixed to the masts 4 to 7 and thus exerts a load directed downwards, substantially centered on the axis A. In FIG. 2, this load is symbolized by the arrow 13.

We thus note that the masts 4 to 7 form a structure similar to a cross of ogives. The masts 4 to 7 are for example made of concrete and the cables 8 to 11 in wire ropes. The masts 4 to 7 have for example a height of 100 m and a diameter of 1.5 m.

Pylon 2 is able to carry a large payload, relative to its own weight. Indeed, thanks to the structure described above, the load represented by the arrow 13 tends to flamber the masts 4 to 7, that is to say, to accentuate their curvature. Conversely, the stays 8 to 11 exert a tension which tends to straighten the masts 4 to 7, that is to say to reduce their curvature. The balance of these forces gives each mast a controlled buckling in a plane defined by the mast and the stay. We can therefore speak of a mast with controlled buckling. Masts 4 to 7 must not have a large section to resist buckling. The buckling may for example be between 5% and 10%.

In addition, the masts being interconnected and oriented in four different directions, the stability of the pylon 2 is ensured in all directions.

Although the invention has been described in connection with a particular embodiment, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

The pylon described can be used in other structures than a ferry bridge. For example, other applications are a pylon for high-voltage line, a pylon for a cable car, a structure for a high-rise building, ...

A pylon with four masts has been described. However, the invention more generally relates to a pylon comprising at least three masts.

Claims

1. Pylon (2) for the construction of a structure, of the type comprising at least three masts (4, 5, 6, 7) distributed around a central vertical axis (A), each of said masts having one end upper (14) and a lower end (15) connected to the ground, said masts being interconnected in the vicinity of their upper ends, said upper ends being closer to each other than said lower ends, said tower comprising at least three stay cables (8, 9, 10, 11), each of said masts being respectively connected to one of said stay cables extending from the vicinity of the upper end of the mast to the ground or to the lower end of the mast, characterized in that each of said masts is arched with its concavity facing said central axis, in that said pylon comprises a holding device which keeps said stays at a distance from said masts further from said central axis than said masts, and in that said pylon comprises a load connected to said masts.

2. Pylon according to the preceding claim, wherein the masts are made of concrete and cable guy wires.

3. Pylon according to one of the preceding claims, wherein said holding device comprises at least one yard (12) extending between one of said masts and one of said stays.

4. Pylon according to one of the preceding claims, wherein at least one of said masts has a buckling of between 5% and 10%.

5. Pylon according to one of the preceding claims, comprising four masts whose lower ends are arranged at the four corners of a rectangle.

6. Bridge (1) comprising two pylons (2) carrying a bridge (3), at least one of said towers being a tower according to one of the preceding claims, wherein said load comprises said gateway.