Task 3.1 Resubmission

11
BTEC HND in QUANTITY Surveying British College of Applied Studies TASK 03.1 Explore formwork arrangement needed for the construction of building elements (minimum 3 elements). proper sketches drawn by the student himself/herself of form work arrangement should be produced for each elements. Introduction This task depends on various types of formwork which are carried out during the time of construction. The necessity of doing form works in construction works. How it helps the work load? The areas where form works are needed during construction work. The type of form work used in the site selected and preparation of the form works for the required elements. Form work for the construction of building elements 01. Foundation Formwork Foundation formworks can be designed in various ways. Basically there is a difference between formwork for individual foundations, normally designed as socket foundations, and formwork for strip foundations. The type of design is dictated by the size, mainly by the height of the foundation formwork. The formwork for individual foundations is similar to column formwork and the formwork for strip foundations is similar to the formwork. Normally sheeting panels with formwork bearers in the form of walkers are used for foundation formwork. Individual foundations are also secured by means of walkers but of rim type. Bracing is by squared and round timbers as well as boards diagonally arranged. Tie wires as well as metal screws are used as formwork ties. Building Constriction Technology Page 1

description

bbbnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb

Transcript of Task 3.1 Resubmission

Page 1: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

TASK 03.1Explore formwork arrangement needed for the construction of building elements (minimum 3 elements). proper sketches drawn by the student himself/herself of form work arrangement should be produced for each elements.

IntroductionThis task depends on various types of formwork which are carried out during the time of construction. The necessity of doing form works in construction works. How it helps the work load? The areas where form works are needed during construction work. The type of form work used in the site selected and preparation of the form works for the required elements.

Form work for the construction of building elements

01. Foundation Formwork

Foundation formworks can be designed in various ways. Basically there is a difference between formwork for individual foundations, normally designed as socket foundations, and formwork for strip foundations. The type of design is dictated by the size, mainly by the height of the foundation formwork.

The formwork for individual foundations is similar to column formwork and the formwork for strip foundations is similar to the formwork.

Normally sheeting panels with formwork bearers in the form of walkers are used for foundation formwork. Individual foundations are also secured by means of walkers but of rim type.

Bracing is by squared and round timbers as well as boards diagonally arranged. Tie wires as well as metal screws are used as formwork ties.

Figure -1:- Foundation formwork1- Formwork sheeting 2- stool 3 –whaler 4 –post 5- thrust-boards 6 -concrete bottom 7 -tie wire

Building Constriction Technology Page 1

Page 2: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

02. Column Formwork

Similar to beam formworks, the sheeting of column formworks is prefabricated according to the column dimensions from sheeting boards connected by cover straps.

The sheeting panels are placed in a foot rim which is anchored in the soil by steel bolts.

The foot rim consists of double-nailed boards. The foot rim must be exactly measured-in because it is decisive for the exact location of the column. It has the same functions as the thrust-board for foundation or beam formwork.

When the sheeting panels have been inserted in the foot rim, vertical arch timbers are placed to take up the forces from the cover straps of the formwork sheeting.

Around the arch timbers, which have the function of whalers, column clamps of flat steel are clamped with wedges or a rim of boards is arranged similar to the foot rim. Additional formwork tiding by tie wires or steel screws is not necessary.

The distances of the clamps are specified in the formwork project. Normally they are approximately 700 mm.

The column in the formwork is laterally tied by diagonal board braces.

Figure -2:- Column formwork

Building Constriction Technology Page 2

Page 3: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

Figure -3:- Column formwork (horizontal section)

1- Formwork sheeting 2- cover strap 3 -clamps 4- arch timbers

A lateral cleaning hole is to be provided at the foot of the formwork for removal of any impurities in the form-work before the concrete is placed.

If a steel reinforcement is to be erected in the column formwork, two sides of the column only are to be provided with formwork first to permit easy erection of the reinforcement. After erection of the reinforcement, the remaining two sides of the column formwork can be mounted.

The two sides mounted first are to be arranged cornerwise to ensure provisional stability.

Check for verticalVertical of the formwork was checked by the using plump bob. That is the distance between the outer edge of the formwork and vertical string was taken. That distance was taken in bottom and top. For the exact vertical both top and bottom should be equal. It was checked in the four sides. If the two readings are different, then it can be corrected by tightening or releasing jacks reference to the bottom reading. Then the right angle at four sides was checked by using tri square.

Building Constriction Technology Page 3

Page 4: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

Formwork for beam and slab

Beams Formwork

The shuttering to concrete beams whether its reinforcement or not may be supported in a number of ways the three main methods are:-

Using timber props

Using a n adjustable steel props

Using scaffolding to support adjustable fork heads.

The shuttering to steel beam may be supported as described above but provided that the steelwork is properly anchored it may also be suspended from the steel work. In the site No11, Initium road, Dehiwala.

Material will use in my proposed site are, Plywood, Timber props, Tie rod, Split level, Plumb bob and Tape. Initially beam bottom will be made. Then the beam bottom will be fixed between two columns after that props will fix under the bottom of the beam. After that side boards will fix .then slab will laid on top of the beam. Galvanized iron pipe will be used between two side boards for the stabilization of the structure. Then tie rods will be used to fix the side board. Before tied the beam spacer blocks, which has the cross sectional dimensions of beam was fixed between two side boards .Finally beam will be aliened using string. And water tube level used to check the vertical alignment of the beam. Every 2’ to 2.5’ the timber props will use to shoring the beam and beam bottom.

Building Constriction Technology Page 4

200mm

200mm

Figure -4:- Vertical checking

Page 5: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

Building Constriction Technology Page 5

50mmX50mm timber (2”X4” inches)

15mm thicknesses ply wood

Figure -5:- Beam site board

Figure -6:- Bottom board of beam

50mm*50mm timber (2”X4”)

15mm thicknesses ply wood

Wall thickness 225mm (9”)

50mmX50mm timber (2”X4”)

Page 6: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

Building Constriction Technology Page 6

Figure -8:- 2.5Site board

15mm thicknesses timber

50mmX50mm timber (2”X4”)

Figure 7:- After fixing bottom board and side board

Column 225X 225mm

Timber props

Page 7: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

Figure -9:- Beam & Slab formwork at my site

Figure -10:- soffits of slab formwork at my site

03. Stairs Formwork

First and inclined 45oply wood is taken and from the slab level it is raised to the horizontal plywood which is used as the landing and then the basic components are used which is treads, rise and strings. The common form of construction is for treads and rises to be housed in to the strings. The housing should not be more than 12mm deep and tapered on the underside to allow wedges to be driven in order to ensure a tight joint on the face between the tread or riser and the string.

Building Constriction Technology Page 7

Page 8: Task 3.1 Resubmission

BTEC HND in QUANTITY Surveying British College of Applied Studies

The thickness of the tread and risers will depend upon the type and the width of the stairways. There are several methods of forming joint between treads and risers and the string. The riser should be strengthened by screws. Figure -37:- Stairs formwork

Figure -11:- Stairs formwork

Conclusion From this task the way of how to construct formwork in all the building is noted. The way of how to form formworks for a column, beam, slab and stairs are understood and how it is done in sites are clearly understood. While construction of the formwork the things which has to be taken under consideration are mention above these are the most important things to check while construction of these form works.

Building Constriction Technology Page 8