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Formwork for tall building.
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P.K.Mallick
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PostPosted: Mon Nov 19, 2012 2:13 am    Post subject: Formwork for tall building. Reply with quote

Will somebody please explain the shuttering details for concreting of floor beams and slabs in highrise building subjected to sudden gust wind ? I had asked this question in forum earlier but did not receive a proper reply.
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P.K.Mallick
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PostPosted: Sun Nov 25, 2012 9:14 am    Post subject: Re: Formwork for tall building. Reply with quote

I have once suffered due to gust wind when the shuttering plates flew away for a normal 5 storied building. This issue has bothered me lot and I am yet to learn how to carry out shuttering work against gust wind. Will somebody teach ?
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suraj
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PostPosted: Sun Nov 25, 2012 11:04 am    Post subject: Formwork blowing away Reply with quote

Formwork blowing away<xml><o></o>
1       Dear Eng Mallick
It is very common that during high winds say 80 to 120 km, there could be certain chances that formwork blow away, when it is partly completed<o></o>

2       Not only, on 5 stories building work, but also, at ground, this can happen<o></o>
3       Very often, fabricated plates do fly away, which happened with me also, when foundation sides fell in to basement trench from ground sides over trench<o></o>
4       But from installed or erected/fixed locations, there are no such chances, since tie bolting is arranged within walls & columns<o></o>
5       Every member should immediately, be completed with formwork erection, so that once it is installed, it would remain intact<o></o>
6       Formwork is generally, fabricated either using plywood or wooden planks or steel plates<o></o>
7       Even propriety formwork do not have such resistance, until installed in place duly connected or tied<o></o>
8       Formwork for vertical members at whatever height should be carried out with full precaution to prevent falling after blowing<o></o>
9       On external sides, scaffolding has to be erected in all cases, which should be designed in such a way that formwork falling is obstructed<o></o>
10  Formwork sides placing in should immediately, follow with its nail connections & initial bolting<o></o>
11  It has been noticed that on sites, generally, fabricated panels or even plywood is left without connections, which is always susceptible to blowing during heavy winds<o></o>
12  Formwork for beams bottom/soffit is placed & sides are not placed in immediately, just for reinforcing bars placement, which gives way for accidents<o></o>
13  Should that be a case, beam sides should be tied up at top & supported at bottom to avoid such blowing incidents<o></o>
14  Columns formwork may not pose such state, since once closed, no movement out of placement can occur<o></o>
15  It applies to walls formwork also, once tied up & temporarily supported<o></o>
16  Since suspended slabs or other slabs consume considerable time for working relevant formwork, precautions should be resorted to immediately, after plywood is placed on prepared battens’ grids of propriety system base<o></o>
17  No loose fabricated pieces should be left in areas subject to winds<o></o>
18  No smaller cut out pieces of wood should be left on site to avoid their blowing by winds<o></o>
19  In case, there is no way out not to keep out of site fabricated members, an attempt should be made to stack all properly & held at certain points to avoid flying<o></o>
20  Fabricated members should never be kept vertical or leaning to walls unattended<o></o>
21  Fabricated sides may not cause many issues due to facts that all these full height members are considerably heavy for erection or fixing purpose, while steel panels of full form size too are considerably, heavy requiring crane erection purpose<o></o>
22  During high winds pouring concrete is not allowed, but formwork requires full intact & once disturbing storm passes, all parameters pertinent to formwork should be re checked<o></o>
23  Small height of pour, when concrete pump is used for concrete pour should be avoided<o></o>
24  Concrete should be poured in height 3.5 to 4 m or even more if vibrator use does not question its proper & effective use<o></o>
25  Working platform for pouring do cause issue to fall during winds, since site personnel do not care about its stiffness & stability<o></o>
26  Safety requirements demand that all requirements pertinent safety must be met, for formwork, temporary as well as preparatory activities  <o></o>
27  Always cup lock system or equivalent should be included for temporary & preparatory installation support<o></o>
28  Scaffolding system should properly be braced along as well as connected or anchored to certain part of structure & never be free standing at ground<o></o>
29  Many instances have been reported collapse of formwork due to so many causes, which could be avoided professionally<o></o>
30  During dusty as well as stormy weather conditions, no high level work should be carried out from safety view point<o></o>
31  It is site personnel including project engineers to keep watch on weather conditions & site working, so that it remains under prosecution controls safely<o></o>
32  There are no specific methods pertinent raised question, which mathematically or otherwise, respond to raised query<o></o>
<o> </o>
<o> </o>

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P.K.Mallick
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PostPosted: Sun Nov 25, 2012 11:51 am    Post subject: Re: Formwork blowing away Reply with quote



No,certainly I am not looking for any mathematical solution.The coastal belt of India is always prone to gust wind particularly in rainy season and sometimes in summer season. Now many tall structures are coming up in India. In my place ,Bhubaneswar , there are many tall buildings under construction , particularly a 40 storied by Unitech. I just wonder how these shuttering have been fabricated against gust wind which is common.When the construction is on in a populated place ,we certainly can not leave it like that.
Warm Regards.


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PostPosted: Sun Nov 25, 2012 12:05 pm    Post subject: Formwork Reply with quote

Formwork<xml><o></o>
1       No requirement to leave system like this<o></o>
2       Propriety systems are used for all members, manufactured using heavy steel members in all profiles<o></o>
3       Such members are well connected at bottom, middle & at tops at tenable spacing in both directions<o></o>
4       Even, after all such stringent provisions, it acts only, once has been fixed<o></o>
5       Such systems are often used in gulf coastal areas<o></o>
6       Site controls shall be required everywhere<o></o>
7       Scheduling & repetitions of formwork require planning<o></o>
8       Systems are charted out for fabrications & site installation based on demanded design requirements<o></o>

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P.K.Mallick
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PostPosted: Sun Nov 25, 2012 5:09 pm    Post subject: Re: Formwork Reply with quote

suraj wrote:
Formwork<xml><o></o>
1       No requirement to leave system like this<o></o>
2       Propriety systems are used for all members, manufactured using heavy steel members in all profiles<o></o>
3       Such members are well connected at bottom, middle & at tops at tenable spacing in both directions<o></o>
4       Even, after all such stringent provisions, it acts only, once has been fixed<o></o>
5       Such systems are often used in gulf coastal areas<o></o>
6       Site controls shall be required everywhere<o></o>
7       Scheduling & repetitions of formwork require planning<o></o>
8       Systems are charted out for fabrications & site installation based on demanded design requirements<o></o>


Sir
Will you please suggest names of some manufacturers who are manufacturing these type shuttering well connected at bottom,middle and top?
Warm Regards.

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PostPosted: Mon Nov 26, 2012 8:11 am    Post subject: Formwork vendors Reply with quote

Formwork Vendors

  1. I have dealt with professional formwork manufacturers namely DOKA & RMD in particular, who are considered at international business operation
  2. PERI is also, considered very good vendor, which girders I used long back
  3. There are so many others low profile companies everywhere
  4. I dealt with KHK also, long back, but not sure about their performance
  5. Formwork technology has been advancing very fast & newer systems have erupted frequently including all requirements
  6. But, cost impact is very high should it be procured from professional vendor
  7. Professional vendor studies all drawings & requirements based on which, recommendations are suggested to client
  8. Recommendations could be whether to purchase or to higher
  9. All erection drawings with engineering calculations are provided specifically, for meeting all requirements for approval issues
  10. Third party certifications regarding installation is also, conducted when safety pertinent erected members being a question mark
  11. I presume that you are well aware about such vendors

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sivavadivelan
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PostPosted: Wed Nov 28, 2012 7:46 am    Post subject: Reply with quote

We generally use scaffolding arrangement with coupler pipes as grid of spacing 1.00m to 1.500m C/c. The scaffolding arrangements are anchored to the vertical columns with Pipe bracing rigidly at equal intervals.

We always ensure that the shuttering plates are always well secured with scaffolding.

Regards


M.Sivavadivelan
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PostPosted: Wed Nov 28, 2012 4:12 pm    Post subject: Reply with quote

sivavadivelan wrote:
We generally use scaffolding arrangement with coupler pipes as grid of spacing 1.00m to 1.500m C/c. The scaffolding arrangements are anchored to the vertical columns with Pipe bracing rigidly at equal intervals.

We always ensure that the shuttering plates are always well secured with scaffolding.

Regards


M.Sivavadivelan


Will you please attach some sketches showing critical connections in shuttering of beams and slabs which would resist gust wind ?
Warm Regards.

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PostPosted: Tue Dec 04, 2012 5:56 pm    Post subject: Reply with quote

http://ctbuh.org/TallBuildings/VideoLibrary/ConferenceVideos/2010_Mumbai_T5_Gnida/tabid/2145/language/en-GB/Default.aspx/

A video on form work to Tall Buildings presented by Juergen Gnida, Head Key Projects, PERI Gmbh, Germany at the 2010 Mumbai Conference may be found in the above link. This presentation throws light on the ACS & RCS developed by Peri - the core systems used in a High-rise project. While the ACS self-climbing system is the optimal formwork scaffolding for external and internal for highrise, the RCS is particularly used for external sides of highrises. The climbing protection panel for skeleton structures is one of most distinctive feature of the system.
Run Time: 19:50

Regards,
NS
P.K.Mallick wrote:
sivavadivelan wrote:
We generally use scaffolding arrangement with coupler pipes as grid of spacing 1.00m to 1.500m C/c. The scaffolding arrangements are anchored to the vertical columns with Pipe bracing rigidly at equal intervals.

We always ensure that the shuttering plates are always well secured with scaffolding.

Regards


M.Sivavadivelan


Will you please attach some sketches showing critical connections in shuttering of beams and slabs which would resist gust wind ?
Warm Regards.
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