Shoring and reshoring footing formwork foundation

Part1
Yi GAO z5125713
Yifan Zhan z
Baoheng Chen z
Construction practise being studied: Formwork

Part1

Four categories for form systems (ACI,2005).

● Disposable forms which can be assembled on the jobsite.● Prefabricated conventional forms that can be reused.● Manufactured modular panel forms.

Reference
ACI, 2005. The Contractor’s Guide to Qaulity Concrete Construction. Michigan: American Concrete Institute.

Hurd, M., 2005. Formwork for Concrete, Seventh Edition. Michigan: American Concrete Institute.

(This is the 'Select' step.)
Outline in a concise way the practice that you are studying.

Method/Performance Observed

The design of vertical formwork observed on the construction is exactly shown on Figure 2 and the cross section part is displayed on Figure 3. Studs are made up of 95mm x 47mm timber LVL’s to support the sheathing and wales are made up of double 95mm x 47mm timber LVL’s to provide support for the studs. Form ties are installed through forms to resist the concrete pressure bursting. By the observation, the total height of this formwork is 3.35m. A 300mm thick, 12.5m long, 3m high wall is poured into this formwork with a pump having a delivery rate at the nozzle of 25m^3/hr. Assume the concrete density is 2400kg/m^3 and concrete temperature at the placement is 25C. The concrete uses GB cement and has no retarders or super plasticizing admixtures. Therefore, the design pressure envelope for this concrete wall is 67.35kPa.

Purpose-what is achieved
Concrete formwork is a temporary structure providing the support to freshly concrete until it can
support the imposed load by itself.

Is it necessary?

Long term alternative: Wall formwork reuse, which will reduce the cost of formwork.

What?

(c) The formwork wall is around the whole formwork project.

It is the same location with preceding and succeeding activities.

a) The construction site is under a

construction needs a high rise

reinforce the concrete walls,

b) Concrete wall should have the

Where else could it be done?

the distance of transportation from material sources to formwork
location can be reduced to
improve work efficiency.

design safety and working safety.

Then, build the formwork and

The sequence is fixed.

Scaffolding and protective railing are necessary to be erected when working on high level before

References
Ling, Y. Y. & Leo, K., 2000. Reusing timber formwork: importance of workmen's efficiency. Building and Environment Vol 35, pp. 135 - 143.

Include in the appendices the summarised data and observations that you have collected, and anything else that you consider is relevant to what you have said and done earlier.