Structural Requirements AT The Historic Ships Workshop ...

Structural Requirements

AT

The Historic Ships Workshop National Museum of the Royal Navy

Rev A

Project: xxx

1

Project: NMRN Historic Ships Workshop Ref: 220408

Date: November 2020

CONTENTS

1. INTRODUCTION

2. BASIS OF DESING

3. INVESTIGATIONS

4. TEMPORARY WORKS

Appendix A – MNP Mark up indicating timber cabin structures

Appendix B – MNP Mark up indicating loads applied to mezzanine

Appendix C – MNP Mark up indicating new lintels

Report prepared by:

________________________

David Rafferty MEng (Hons) CEng MIStructE

Associate Director

Project: xxx

2


Date: November 2020

1. INTRODUCTION

This document sets out the structural philosophy and site requirements for the works to provide a new Historic Ships Workshop for the Museum of the Royal Navy at Portsmouth. The new facility is contained within the first bay of the Grade II* Rope House, constructed in 1771. The interior of the building was reconstructed in 1960. No structural fixings or interventions are allowed in the original external walls of the building. A new proprietary steel mezzanine is to be provided, along with timber cabins, both at ground level and on the mezzanine. 2. Basis of Design 2.1 Mezzanines

The mezzanine is to be designed for a variable load of 3.5kN/m2. The mezzanine is to be used for general office space and other light duty uses. The stability of the proprietary structure will be derived from cross bracing and no lateral loads are to be applied to the surrounding masonry.

An existing freestanding masonry wall within the space is to be retained. This wall is currently restrained by a series of timber joists spanning from the wall the external façade of the building. These joists will be removed to accommodate the new mezzanine. The new mezzanine must be designed and constructed such that:

1) A horizontal restraint is provided to the top of the freestanding wall. 2) The installation sequence should account for the temporary stability of the

freestanding wall after the existing joists are removed and before the mezzanine is complete.

The new mezzanines is to be supported off of the existing concrete floor slab of the workshop.

Unfactored line loads resulting from the installation of the timber cabins are provided on a mark up by MNP. The supplier of the mezzanine must incorporate these loads into their design. 2.2 Timber Cabins The cabins are intended as freestanding enclosures. The roofs of the cabins are designed to support only occasional maintenance access and light services (lighting and small power distribution) only. They must not be used for the storage of materials or to suspend equipment or machinery.

Stability is provided by the ply sheathing and OSB roof deck. Where the polycarbonate cladding is provided the studs are intended to cantilever from the top of the ply cladding to the roof. The cabins are to be fixed back to the existing internal masonry walls only.

Project: xxx

3


Date: November 2020

3. Investigations

To facilitate the new installations the following investigation is to be completed by the appointed contractor in the first week of their possession of the site.

3.1 Workshop Floor

Holes Should be drilled to ascertain the thickness of the workshop floor slab. The junction of the existing freestanding wall and the floor slab should also be investigated.

4. Temporary Works

The design of temporary works is the responsibility of the main contractor and should comply with the relevant standards, including the provision of a suitable temporary works coordinator. The contractor’s attention is drawn in particular to two areas of temporary works:

1) The temporary stability of the existing freestanding wall.

2) The temporary stability of the timber cabins. Until the cladding and roof deck is complete the overall stability of the structures will require temporary bracing or propping.

605b-WD-10-000

Proposed Bay 1 Overview

Drawing Number

Drawn Checked Scale Date Revision

Drawing Title

Dannatt, Johnson ArchitectsUnit 1 The Wireworks, 77 Great Suffolk Street, London SE1 0BUTelephone (020) 7357 7100 Fax (020) 7357 7200

Drawing Status

RevisionsDate By CommentsNo.

NATIONAL MUSEUM OF THE ROYAL NAVYHISTORIC SHIPS WORKSHOP

ST DJ Aug 2020 P041:100@A1

- 25.08.2020 ST Issued for Discussion

TENDER

Entrance SpaceG01

Corridor 1G06

Existing StairES1

Office 1G07

Office 2G08

Workshop 02G09

Machine RoomG10

PlantG11

Workshop 01G14

Power to workbenches from crane columns

D-E

S1-

X1

D-G06-X1

D-G

08-X

1

D-G07-X1

D-G

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D-ES1-X2

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Laminating facilityG13

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D-G13-03

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D-G14-X2

D-G14-X1

D-G

01-X

1

D-G

02-X

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Stair 2G12

FURNITURELAYOUT ASEXISTING


D-G10-02 D-G12-02

D-G15-02

D-G

15-0

1

Painters BayG15

drain

water supply

rad

soil

rad

waste

drain

SANDER

Ground Floor PlanScale: 1:1001

D-M

05-0

2

Existing StairES1 Hall

M02

KitchenM04

Office 3M05

Hot Desk SpaceM06

Mezzanine StoreM07D-M05-03

D-M06-01

D-M

11-X

1

D-E

S1-

X3

D-M

05-X

1

Office 04M11

D-M

10-0

1

Stair 3S2

D-M04-X1

Mezzanine / First FloorScale: 1:1002

N

2M0M 10M

Existing StairES1

Roof AccessS01

Meeting RoomS02

Office 5S03


Stair 3S3

Fire

rate

win

dow

?

D-S

02-X

1

D-ES1-X4 D-S

03-X

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Second FloorScale: 1:1003

02.11.2020 STP01 Issued for Planning

02.11.2020 STP02 Reissued for Tender

20.01.2021 STP03 Scope reduction sign off

17.03.2021 STP04 Scope Reduction

P04

P04

P04 P04

P04

P04

MNPStructural Comments for TimberBoxesDR 10/11/20Rev D 25/3/21

Minimum solid lengthof wall at ends to be2.6m (i.e. each sideto be 1.3m)

150x50 C24 studs at 600mm c/c (locateddirectly below each ceiling joist). Provide 3Nonoggins evenly spread below polycarbonatecladding. Sheathing to be the equivalent of9mm OSB board on outside face generally. Sheathing required to both faces on end walls.Sole Plate to be fixed down into floor slab withM12 resin anchor at 600mm c/c.

Provide doubled upcripple studs at eitherside of opening,supporting lintelformed from pair of200x75 joists.

Provide Finnjoist 300-58 I-section joistsat 600mm c/c, located directly abovesupporting stud. Provide full depthblocking at supports and 3 sets of fulldepth noggins or herringbone strutsevenly spaced over span. Joists to support a 18mm ply deck.

Ceiling StructuresJoists and walls supportingceilings are designed for nominalmaintenance access only andlight services (i.e. lights and smallpower distribution). They mustnot be used as floors or storage,nor should equipment besuspended from them

100x50 C24 studs at up to 600mm c/c (locateddirectly below each ceiling joist). Providenoggins at 3No noggins evenly spread. Sheathing to be the equivalent of 9mm OSBboard on outside face generally.

First stud fixed to internalwall to provide stability tonew structure.

Provide Finnjoist 220-58 I-section joists at600mm c/c, located directly abovesupporting stud. Provide full depth blockingat supports and 3 sets of full depth nogginsor herringbone struts evenly spaced overspan. Joists to support a 18mm ply deck or similar.

In first 3m provide fulldepth noggins at 1mc/c.

No vertical joint in plycladding to end walls

Fix head of new wall toexisting internalmasonry wall.

New stud wall fixed toedge of existingmasonry wall

Provide Finnjoist 220-58 I-section joists at600mm c/c, located directly abovesupporting stud. Provide full depth blockingat supports and 3 sets of full depth nogginsor herringbone struts evenly spaced overspan. Joists to support a 18mm ply deck or similar.

First stud fixed to internalwall to provide stability tonew structure.

100x50 C24 studs at 600mm c/c (locateddirectly below each ceiling joist). Provide 3Nonoggins evenly spread below polycarbonatecladding. Sheathing to be the equivalent of9mm OSB board on outside face generally. Sheathing required to both faces on end walls.Sole Plate to be fixed down into floor slab withM12 resin anchor at 600mm c/c.

605b-WD-10-000


Drawing Number


Drawing Title


Drawing Status



ST DJ Aug 2020 P041:100@A1


TENDER

Entrance SpaceG01

Corridor 1G06

Existing StairES1

Office 1G07

Office 2G08

Workshop 02G09

Machine RoomG10

PlantG11

Workshop 01G14


D-E

S1-

X1

D-G06-X1

D-G

08-X

1

D-G07-X1

D-G

11-X

2

D-ES1-X2

D-G01-X2

D-G

11-X

1


D-G

13-0

1

D-G13-03

D-G

13-0

2

D-G

12-0

1

D-G

10-0

1

D-G14-X2

D-G14-X1

D-G

01-X

1

D-G

02-X

2

Stair 2G12



D-G10-02 D-G12-02

D-G15-02

D-G

15-0

1

Painters BayG15

drain

water supply

rad

soil

rad

waste

drain

SANDER


D-M

05-0

2


M02

KitchenM04

Office 3M05

Hot Desk SpaceM06


D-M06-01

D-M

11-X

1

D-E

S1-

X3

D-M

05-X

1

Office 04M11

D-M

10-0

1

Stair 3S2

D-M04-X1


N

2M0M 10M

Existing StairES1

Roof AccessS01

Meeting RoomS02

Office 5S03


Stair 3S3

Fire

rate

win

dow

?

D-S

02-X

1

D-ES1-X4 D-S

03-X

1






P04

P04

P04 P04

P04

P04

MNPLine Loads on ProprietaryMezzanineDR 10/11/20Rev A 25/3/21

Key to Line LoadsLoads are un-factored

Permanent Load = 2.85kN/mVariable Load = 1.5kN/m

Permanent Load = 1.5kN/mVertical load due to horizontal load = 0.75kN/m

Permanent Load = 3.8kN/mVariable Load = 2.5kN/m

605b-WD-10-000


Drawing Number


Drawing Title


Drawing Status



ST DJ Aug 2020 P041:100@A1


TENDER

Entrance SpaceG01

Corridor 1G06

Existing StairES1

Office 1G07

Office 2G08

Workshop 02G09

Machine RoomG10

PlantG11

Workshop 01G14


D-E

S1-

X1

D-G06-X1

D-G

08-X

1

D-G07-X1

D-G

11-X

2

D-ES1-X2

D-G01-X2

D-G

11-X

1


D-G

13-0

1

D-G13-03

D-G

13-0

2

D-G

12-0

1

D-G

10-0

1

D-G14-X2

D-G14-X1

D-G

01-X

1

D-G

02-X

2

Stair 2G12



D-G10-02 D-G12-02

D-G15-02

D-G

15-0

1

Painters BayG15

drain

water supply

rad

soil

rad

waste

drain

SANDER


D-M

05-0

2


M02

KitchenM04

Office 3M05

Hot Desk SpaceM06


D-M06-01

D-M

11-X

1

D-E

S1-

X3

D-M

05-X

1

Office 04M11

D-M

10-0

1

Stair 3S2

D-M04-X1


N

2M0M 10M

Existing StairES1

Roof AccessS01

Meeting RoomS02

Office 5S03


Stair 3S3

Fire

rate

win

dow

?

D-S

02-X

1

D-ES1-X4 D-S

03-X

1






P04

P04

P04 P04

P04

P04

MNPStructural Comments for Structural OpeningsDR 29/10/20Rev A 26/3/21

LintelsUnless noted otherwise all lintels areto be from Naylors Fair faced range. Lintels have minimum 30min fireresistance and are suitable forpainting.Minimum bearing 150mmIf alternative lintels are to be providedthe contractor must provide sufficientinformation to confirm that thecapacity and overall performance ofthe alternative is at least equal to thespecified product.

Form new opening (3.1m approx). withpair of Faced R9 lintels.Note weight of each lintel isapproximately 180kg

Form new opening (2.2m approx). with Faced R9 lintel.Note weight of lintel is approximately180kg

Form new door opening withpair of Faced R6 lintels

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