GB2447224A

GB2447224A - Portable solid loq wall cabin assembled on a steel or timber chassis

Info

Publication number: GB2447224A
Application number: GB0707449A
Authority: GB
Inventors: David Copley
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-03-08
Filing date: 2007-04-18
Publication date: 2008-09-10
Also published as: GB0707449D0; GB2447224A8; GB0704463D0

Abstract

A chassis comprises of a pair of longitudinal frame members, which are disposed parallel to and spaced from each other. A plurality of transverse supports are connected between and at spaced intervals along the length of the longitudinal members. Attachable lifting stubs made of universal I beam steel may be attached at corner and mid sections of the chassis at predetermined points, slings may then be attached to the stubs by lifting eyes. Preferably a lifting beam allows a crane to lift the unit with control using slings so that it can be transported. Timbers may be fixed to the chassis in order to attach a log cabin them upon. The chassis is preferably placed on a concrete block ring foundation with a damp proof course. Services may be passed through the chassis. In use the chassis supports a portable, pre-fabricated, log cabin.

Description

24 224 Descri tion Solid lo wall cabin assembled on a steel or timber

chassis to comply with the 1960 & 1968 Caravan & Mobile Homes Act The present invention proposes the assembly of a log cabin on a base frame chassis to meet the Acts, a chassis provides a base for a log cabin to be assembled on and once constructed allows the caravan to be transported from one place to another.

What I produce is essentially a caravan that is built to the 1960/1968 Caravan Act in solid logs, a "Log Cabin". To meet the Act I have designed a base frame chassis that carries a log cabin unit and enables it to be lifted for transportation. The log cabin is built within the constraints of the Acts, taking into account such things as size of a unit and other issues such as the weight of a unit which the chassis supports.

The base frame chassis is usually made of two longitudinal frame members of universal I beam steel or timber and supporting cross-members or transverse supports usually formed from lengths of universal I beam steel or timber which are bolted together to form a load bearing framework at predetermined sizes thereof. The chassis frame supports the body of the log cabin, the size of the I beam steel or timber chassis frame is determined by a structural engineer who calculates the specification required for each unit.

Single steel sections are galvanised or pre-treated before assembly to provide long time resistance to corrosion and then welded together before the cabin is assembled.

Similarly, timber can be freated and protected before assembly.

Attachable lifting stubs made of universal I beam steel are attached at corner and mid sections of the chassis at predetermined points. Slings are then attached to the stubs by Lifting eyes. A lifting beam allows a crane to lift the unit with control using slings. This makes the unit compliable within the regulations set out below: * Definition of a caravan A caravan' is defined in Statute as follows: 1960 Act 1. CARAVAN' means any structure designed or adapted for human habitation which is capable of being moved from one place to another (whether by being towed or by being transported on a motor vehicle or trailer). -a--

Constraints Dimensions when assembled exceed any of the following limits, namely: 1. Length: (exclusive of any drawbar): 60 feet (18,288 metres).

2. Width: 20 feet (6,096 metres).

3. Overall height of living accommodation (measured internally from the floor at the lowest level to the ceiling at the highest level: 10 feet (3,048 metres).

Other considerations 1. Weight: a unit can be up to circa 40 tonnes.

References to drawings Figure 1 Shows a Loa cabin chassis that a log cabin is assembled on. This chassis can be made out of steel or timber Figure 1 shows the construction of the chassis which can be manufactured from universal I beam steel or timber(1). This would be assembled on a blockwork, brick, concrete or similar level foundation(2). To protect the logs from moisture ingress a damp proof course is placed below and on top of the chassis(3). Attachable stubs are fitted for lifting purposes(5,6 & 7). A lifting eye enables a sling to be attached to the chassis and lifting beam(8) 1 -Chassis sub frame. Universal I beam steel or timber in size required by engineer la -Longitudinal Member lb -Transverse member 2 -Block work (Newton block, brick or concrete or similar level base) on foundation 3-Construction timber of log cabin 4-Damp Proof Course (DPC) -Lifting stub 6 -Mid stub (fig 6) 7 -Corner stub (fig 7) 8 -Lifting eye

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Figure 2 Shows a cross section of the I Beam chassis 1 -Chassis sub frame. Universal I beam steel or timber in size determined by structural engineer la -Longitudinal Member lb -Transverse member 2 - Block work (Newton block, brick, concrete or similar level base) on foundation 3 -Construction timber of log cabin 4-Damp Proof Course (DPC) Figure 3 Shows a elan view of the chassis and where Lifting stubs (mid and corner) can be attached as required to lift the chassis and unit.

Figure 3 shows typical locations for the lifting stubs(5,6 & 7) which are positioned along the chassis as determined by the structural engineer. These positions may vary with the size and weight of unit to be lifted.

-Lifting stub 6 -Mid stub (fig 6) 7 -Corner stub (fig 7) 8 -Lifting eye Figure 4 Shows a cross section of a chassis with attached Lifting stub with lifting eve Figure 4 shows a typical lifting stub which is attached to the main chassis with high tensile bolts through the end plate. These stubs can be removed whilst the chassis and lodge are in their resting place location and be refitted when the lodge requires moving.

1-Chassis sub frame. Universal I beam steel or timber in size determined by structural engineer 2 -Block work (Newton Block/Brick or similar level base) on foundation 3 -Construction timber of log cabin 4-Damp Proof Course -Lifting stub 8 -Lifting eye 9 -End plate (fig 5) -Slings -*-Figure 5 Shows a cross section of an End Plate of chassis that a Lifting Stub is bolted to for lifting a chassis I -Chassis sub frame. Universal I beam steel or timber in size required by engineer Ia -Longitudinal Member 1 b -Transverse member 2 -Block work (Newton block, brick, concrete or similar level base) on foundation 9 -End plate Figure 6 Shows a DIan view of Mid Lifting Stub detail 1 -Chassis sub frame. Universal I beam steel or timber in size required by engineer la -Longitudinal Member lb-Transverse member 2 -Block work (Newton block, brick, concrete or similar level base) on foundation -Lifting stub 8 -Lifting eye 9 -End plate (fig 5) Figure 7 Shows a elan view of Corner Lifting Stub detail 1 -Chassis sub frame. Universal I beam steel or timber in size required by engineer la -Longitudinal Member lb -Transverse member 2 -Block work (Newton Block/Brick or similar level base) on foundation -Lifting stub 8-Lifting eye 9-End plate (fig 5) Figure 8 Shows Lo cabin construction on chassis The bottom logs(3) are attached to the chassis(1) by methods including screws and bolts.

1 -Chassis sub frame. Universal I beam steel or timber in size required by engineer 2 -Block work (Newton block, brick, concrete or similar level base) on foundation 3 -Construction timber of log cabin 4-Damp Proof Course Figure 9 Shows lifting method of chassis Figure 9 shows the main lifting beams(12) and stubs(5,6 & 7) attached to slings(10) which in turn are attached to the lifting crane.

1 -Chassis sub frame. Universal I beam steel or timber in size required by engineer 2 -Block work (Newton Block/Brick or similar level base) on foundation 3 -Construction timber of tog cabin 4-Damp Proof Course -Lifting stub 6 -Mid stub (fig 6) 7 -Corner stub (fig 7) 8-Lifting eye 9 -End plate (fig 5) -Stings 11 -Shackles 12-Lifting beam 13-Window 14 -Door 15-Main roof beam 16 -Roof Construction 17-Floor 18 -Foundation -c;-Typical Calculations Lifting Beams Total load of cabin: -Approx 400kn 4no lifting beams = I OOkn per beam Maximum span of lifting beam = 4500mm Load per sling = 100/6 = l7kn Allow 25% for lifting surge = 17 x 1.25 = 22kn Therefore BM =22 x 4.5/4 = 25knM Use 406 x 178 x 54 UB L/RVV = 4500/38.5 = 117 D/T = 402.6/1 0.9 = 37 pbc ICOn/mm2 Therefore M/Z = 25 x 106/ 925 x i= 27n/mm2 <100 Check deflection = 1 x 22 x 4.53x 103x iüi 48 x 21 x 104 x 18526 x = 1mm Use 406 x 178 x 54 UB -17'-

Claims

Claims 1. A chassis for use with log homes or similar unit built under

the Caravan Sites and Control of Development Act 1960 and the Caravan Sites Act 1968.
2. A chassis according to claim 1, comprising of a pair of longitudinal frame members which are disposed parallel to and spaced from each other, supported by a plurality of transverse supports connected between the longitudinal members at spaced intervals along the length thereof which give support to internal walls.
3. A chassis according to claim 2, where each transverse support is connected at each end to a respective one of the longitudinal frame members by means of a mounting point which bolts the support to the longitudinal member.
4. A chassis according to claim 3, where attachable mid and corner lifting stubs can be attached by bolts to the main longitudinal frame members, which enables the chassis and log cabin to be lifted using a lifting beam suspended from a crane by slings that are attached to lifting eyes on the stubs.
5. A chassis according to claim 4, where all of the single component parts of the chassis can be galvanised or otherwise treated to prevent corrosion prior to assembly of the chassis and log cabin.
6. A chassis according to claim 5, where the bottom log of construction timber can be bolted with fixing devices to the chassis which attaches the log cabin to the chassis.
7. A chassis according to claim 6, where the chassis sits on top of a pre-laid nng foundation of Newton concrete blocks, bricks or concrete which provides an even, flat, level surface.
8. A chassis according to claim 7, where a Damp Proof Course can be laid between the foundation and chassis and also top of the chassis and the first log of construction timber to prevent water ingress.
9. A chassis according to claim 8, where the chassis and log cabin can be assembled on site, or off site and moved by transport to its final resting place.
10. A chassis according to claim 9, where the services (water, gas, electric, TV, phone, drains, etc) can be passed and fastened within the chassis and exit through the foundation at specific points.