shoring / lintel information required re extending opening 2

[blueflame]

we are contemplatine extending a door opening by 2 feet the existing lintel is a catnic steel type how do we shore the inside buildibng and the outside wall to allow removeal of the existing lintel and insertion of a new longer deeper lintle?
thanks for attention

 

[dik]

I've often spec'd using 2x dimensioned lumber through bolted on either side to temporarily support the existing masonry. Depending on the opening size and proximity of existing openings this might be appropriate for your use.

Dik

 

[blueflame]

thanks
i was thinking of shoring internally the room with a wall plate a floor plate and 4x2" struts every 3 ft about 1 ft from the wall face
but it is a cavity wall so i was worried about supporting the external wall

eventually i will be leaving a horizontal bearer timber in place to allow me to position temporary spider beams over a proposed glass roofed conservatory so allowing safe boarded access to aircon equipment etc
so this bolted beam may assist in that
i can remove the inner beam after lintle in place and secure the bolts within the recess of the wall and decorate over.
suggestions?
regards larry

 

[jike]

This is normally "means and methods" which is determined by the contractor. I would advise the designing engineer to avoid specifying this. Our insurance underwriter normally cautions against getting involved in this type of work.

That having been said, the most common way I see contractors shoring for lintel installation is with wood or steel needle beams (thru the wall) perhaps every 4 feet on center with posts on the inside and outside the wall.

 

[stevenl]

If you have some wall height left above the opening, I have used a pair of opposing steel angles, each inserted into a horizontal cut to the masonry joint. In my application the angles (sized for DL) were retained and welded to the new lintel, reducing the lintel's size.

My first post, trust it reaches you.

 

[blueflame]

thanks for dvice i only have space on outside wall as lintel already encroaches upon ceiling area inside room
i was under the impression that taking the weight of the ceiling / floor in the room with the existing opening would allow work to be carried out but i now understand that the weight is actually the wall and not necessarily the floor area.
i assume therefore that the openings for the needles must be quite large
i was hoping to utilise 50mm steel scaffold poles as pinns every 2 feet perhaps
thereby limiting structural damage to surrounding

regards larry

 

[jike]

The holes for the needle beams only need to be slightly larger then the beam cross section itself to place it thru the wall.

 

[blueflame]

thanks for info i am away in thailand for 2 weeks from today for an operation / holiday will attend to works upon return
have spoken to partner in crime and he has suggested a combination of ideas
ie internally a scaffold board floor and ceiling plate with acrow jacks supporting and then load sharing timber beam across floor of room above. needles to rest on load sharing beams.
externaly beams supported by acrow jacks.
overall lintel length will be 3.6 m