Patent Application
20160017564
The present invention relates to improved devices and techniques for installing and erecting vertical posts, such as the type used to support overhead cables in, for instance, railway systems. However, the apparatus and techniques disclosed herein can be used in a variety of different situations including, but not limited to, street lighting, antennas, telegraph poles, flagpoles and other situations requiring a substantially vertical supporting member.
In electrified railway systems, there is a requirement to provide vertical support members to support the overhead cabling, which is used to provide electrical power to the locomotives. Often, there is a need to electrify existing track which has historically been used by diesel locomotives. This electrification work is costly, both in terms of the actual costs of the equipment and labour, but also in terms of what is known as ‘possession’, which refers to the time that use of the railway is restricted due to work being performed on it.
There is a desire to restrict the time taken for maintenance and other activities which reduce the time available for trains to run on the track.
Even in the case of newly-built track, there is a need to provide relatively quick, easy to install and reliable equipment, to speed up the overall commissioning process.
When overhead electrical cabling is provided, it is necessary to install overhead gantries and supports at intervals along the track. Typically, in the prior art, excavation of points along the track is required, so that a suitable post can be positioned in the hole created, using a crane, so that the post is held in position while the hole is back filled, usually with a concrete mix which, once solidified, holds the post securely in position.
This process is time-consuming and it can be difficult to ensure that the post is suitably vertical.
Embodiments of the present invention aim to address shortcomings in the prior art, whether mentioned herein or not.
According to the present invention there is provided an apparatus and method as set forth in the appended claims. Other features of the invention will be apparent from the dependent claims, and the description which follows.
For a better understanding of the invention, and to show how embodiments of the same may be carried into effect, reference will now be made, by way of example, to the accompanying diagrammatic drawings in which:
Embodiments of the present invention make use of a two stage process for installing vertical support posts, hereafter termed posts. The first stage involves driving a pile into the ground at the location selected for the post. This can be achieved using standard pile driving techniques, and can be performed at the trackside or from a suitable railway vehicle if possible.
The pile is driven to a depth suitable to support the post which is later inserted therein. In a typical railway installation, a post of height 5-6 meters is required and it is found that a pile driven to a depth of up to 16 metres, depending on geology and local conditions, is suitable. Different types of post may require different pile depths, and different ground characteristics may necessitate different pile depths or other properties.
The post 110 in this embodiment is in the form of an H-beam, but could be of any suitable profile, depending on the job it is to perform. The post is welded to lower end plate 130. In use, lower end plate 130 will sit at the bottom of the pile, which has been driven into the ground.
Pivotally mounted at a plurality of locations around the circumference of lower end plate 130 are pile-engaging members 150. In the embodiment shown, there are three such members (although only two are clearly visible in the figures—150a and 150b). These are located at 120° intervals around the circumference.
The pile engaging members 150 pivot under the action of linkage rods 140. The linkage rods are provided in pairs, such that a pair of linkage rods 140 are attached towards an upper end of the member 150 and extend upwardly towards adjusters 170. The adjusters 170 protrude through a top plate 120. In use, the top plate sits atop and is fastened to the exposed upper end of the pile 200 shown in
The post and clamp assembly 100 is lowered into the interior of the pile 200 such that the top plate 120 rests on the upper surface of the pile. The pile, when driven, was located substantially vertically, but due to ground variations, it may deviate a little from being truly vertical. However, the clamp mechanism 100 is arranged to compensate for any such deviations as will now be described.
The lower end plate 130 is dimensioned to fit inside the pile, with a clearance provided so that it is not a particularly tight fit. The inner diameter of the pile is typically 578 mm, with a wall thickness of 16 mm, and the outer diameter of the lower end plate is arranged to sit inside this, with a gap of at least a few millimetres, to allow flexibility of movement as will be described.
The top plate 120 is dimensioned such that its outer diameter substantially matches the outer diameter of the pile 200. The post 100 passes through a suitable aperture in the top plate. The aperture is dimensioned so that the post 100 passes through it easily with some room for lateral movement. In the embodiment shown, the aperture in the top plate 150 is generally ‘H’ shaped to correspond to the profile of the post 110.
Once positioned inside the pile, the top plate 120 is secured into position using bolts 180, which pass through apertures 160 in top plate 120. The bolts 180 engage with threaded bosses 220, which are arranged around the circumference of pile 200 in positions corresponding to the locations of apertures 160.
In this configuration, there will be a degree of unsteadiness and lateral movement of the post 100, since it is not yet clamped into position. In order to properly secure it and to ensure it is sufficiently vertical, the pile engaging member 150 must be positioned to firmly clamp the post into the correct position.
To adjust the position of the pile engaging members 150, the adjusters 170 are used. The adjusters comprise a threaded rod which is operatively connected to the linkage rods 140 and which further protrudes through the top plate 120. The threaded rod engages with a bolt. By turning the bolt, the threaded rod is effectively pulled upwards which exerts a turning moment on the pile engaging member 150.
By careful adjustment of the three adjusters 170, the post 100 can be re-positioned to be more substantially vertical. Increasing adjustment of a given adjuster will case the post to move in a corresponding direction. By providing a plurality of adjusters 170, the degree of fine tuning which is possible can be controlled. At least three adjusters are required.
The process by which the adjustment is performed may be iterative, in that each adjuster 170 may need to be adjusted more than once, preferably in a sequence, to ensure that the desired degree of adjustment is achieved.
Once the adjustment is complete, the nuts of the adjusters can be locked into position by the addition of a further lock-nut on the threaded bar.
The apparatus is constructed from steel of suitable dimensions to provide the necessary strength, in accordance with the size of the post to be supported. The various parts may be joined by welding if no relative movement is required, or by nuts and bolts if pivoting or rotation is required.
Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1202680.3 | Feb 2012 | GB | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/GB13/50345 | 2/14/2013 | WO | 00 |
