Concrete Formwork Checklist at Construction Site during Concreting and Striking

Concrete formwork is a temporary supporting structure for concrete when it is placed at the construction site to keep the concrete in position and shape till it gets hardened.
Checks for formwork should be carried out before concreting, during concreting and after removal of formwork. Concrete formwork possesses both quality and safety threats. If the formwork is not right for the concrete and work is being done at height, it may cause safety issue.
Quality of concrete is affected when the formwork is not properly aligned, not leak proof etc. Proper storage of concrete formworks is also required to for cost economy of the project.
Concrete Formwork Checklist at Site:

Formwork Checklist for Walls:

Concrete Formwork Checklist for Walls
1. Ensure lateral bracings provided firmly supports the forms at all points of support.
2. Block out (stop end) braced to resist vertical and lateral loads.
3. Form panels are adequately braced and tied with each other.
4. Formwork corners shall be adequately tied to prevent leakage or bulging and spreading of concrete.
5. Ensure sufficient length is provided for wall ties and has sufficient strength and spacing as required.
Concrete Formwork Checklist
6. Check wales for proper proper spacing and joints between should be staggered from one tier to the next.
7. In double member wales, one member left continuous across the location of form ties.
8. Wall ties and bolts tightened properly.
9. In case double member wales is used, both wales should have identical depths.
10. Check for adequate lap between forms and previously cast concrete.
11. Ensure that grout leakage does not occur at joints between panels and joints between old concrete and panels above them.
12. Check the provision of resistance against uplift in case of sloping faces of concrete formwork.
13. Ensure experienced supervisor is available at site while installing the wall forms and while placing concrete.

Formwork Checklist During Concreting:

1. Before concreting commences ensure proper access for workers involved in placing, compacting and finishing concrete.
2. Presence of experienced supervisor keeping a continuous watch for any dangerous situation.
3. Adequate supply of spare props, clamps, bolts, wedges and skilled workers at site.
4. Alignment, camber, level and plumb (verticality) maintained while concreting is in progress.
5. Effective depth between top and bottom reinforcement not disturbed.
6. Cover of concrete around reinforcement steel maintained as specified.
7. Grout loss due to movement at joints and corrective action taken against it.
8. Loosening of wedges and fixings due to vibrations transmitted to the formwork and corrective action against it.
9. Spilt concrete and/or grout cleaned immediately.
10. All wooden spreaders, to hold vertical form faces apart, removed after placing concrete.
11. Wooden members for creating pockets eased before concrete sets fully.
12. Concrete pouring sequence as per that shown on formwork drawing (avoid eccentric loading).
13. Prevention of heaping of concrete and high impact drops from concrete buckets.
14. Rate of concreting within allowable limits as shown on working drawing or as assumed while designing the formwork against lateral pressures.
15. Proper bond between layers of concrete, in case concrete is placed in layers, by ensuring that needle vibrator while vibrating the top layer also penetrates the lower layer.
Concrete Formwork Checks During Concreting

Checklist During Formwork Striking (Stripping or Removal):

1. Formwork design and layout such that smooth striking of formwork in sequential manner is possible.
2. Strength of concrete capable of taking self weight and construction load on it.
3. Removal time to be ascertained depending on size, shape and span of the member, grade of concrete mix and its rate of gain of strength, type of cement, ambient temperature and weather conditions and extent of curing executed.
4. At the time of removal of side form, corners and edges not damaged.
5. Ties, clamps and wedges loosened and removed gradually.
6. Removal time in line with those specified in code of practice (IS 456- 2000).
7. Props in case of beams and slabs removed in stages from mid-span working outwards.
8. Bolts, nuts, clamps, wedges collected in a box and not dropped carelessly.
9. Use of crowbars to prise open forms avoided.
10. Formwork prised loose using wooden wedges.
11. Formwork carefully lowered and not dropped and damaged.
12. Panel faces should be carefully removed and lowered without them hitting the scaffold projections.
13. Panels placed on leveled surface after removal.
14. Nail projections hammered down.
15. Cordoning off the area below the location where formwork removal is proposed.
16. Presence of competent crane operator and foreman.

 Checklist for Cleaning and Storage of Formwork:

1. Formwork as soon as it is removed, cleaned with a stiff brush.
2. Dust, dirt, stubborn bits of concrete or grout removed.
3. Timber surface and uncoated ply coated with release agent before storing.
4. Steel form coated lightly with oil to prevent corrosion.
5. Damaged formwork sorted out and repaired before storage.
6. Depressions, nail holes repaired with suitable materials and lightly rubbed down to give smooth surface.
7. Panels and plywood sheets stored on a horizontally leveled floor.
8. Panels stored face to face to protect the surface.
9. Storage area protected from rain and moisture and well ventilated.
10. All formwork materials stacked off the ground.
11. Loose wailing, soldiers (struts) etc. stored with respective panels after numbering for proper match when reused.
12. Bolts, nuts, champs, pins, wedges, keys and ties stored in separate bins or boxes.

Comments

Post a Comment

Popular posts from this blog

40+ Construction Tools List with Images for Building Construction

Image
Construction tools list for building construction works such as concrete, brick masonry, leveling, wood works, floor works, slab works, brick laying, plastering etc. is provided. Every construction tool is necessary to achieve good results in the whole project. Along with these tools, the workers should also use some safety tools to prevent them from the unexpected accidents. Construction Tools List for Building Construction Some important construction tools and their uses are listed below: Bolster Boning rod Brick hammer Bump cutter/screed Chisel Circular saw Concrete mixer Cordless drill Crowbar Digging bar End frames Float Gloves Hand saw Helmet Hoe Iron pan Jack plane Ladder Line and pins Mason’s square Measuring box Measuring tape Measuring wheel Pick axe Plumb bob Plumb rule Polishers Putty knife Rammer Rubber Boots Safety glasses Safety helmet Sand screen machine Scratchers Sledge hammer Spade Spirit level Straight edge brushes Til
Read more

Building Materials properties and their Importance in Construction

Image
Building materials or construction materials are the major requirement in this modern age of technology. There are many types of building materials used for different construction works. Properties of Building Materials For a material to be considered as building material, it should have required engineering properties suitable for construction works. These properties of building materials are responsible for its quality and capacity and helps to decide applications of these material. Such properties of building materials are categorized as follows. Physical properties Mechanical properties Chemical properties Electrical properties Magnetic properties Thermal properties Physical Properties of Building Materials These are the properties required to estimate the quality and condition of the material without any external force. The physical properties of engineering materials are as follows. Bulk density Porosity Durability Density Density index Specific gravity
Read more

How to Prevent Errors During Setting Out Building Plan on Ground?

Image
Setting out building plan on ground is one of the most significant steps in building constructions and any errors at this stage would cause considerable problems, if it is not tackled immediately. Errors During Setting Out Building Plan on Ground There are different types of errors that might be made when a structure is set out for example gross errors, systematic errors and random errors. These errors should be prevented and there are some measures to tackle these issues. These measures will be discussed in the following sections. Fig.1: Setting Out of Building Plan on Ground Fig.2: Setting Out Building Plan on Ground How to Prevent Errors During Setting Out of Building? Following are the different types of control that should be carried out to prevent any errors during setting out building plan on ground: Good practice in office On site control Equipment and staff Checks Marking the ground Use of grid offset Good Practice in Office To successfully set
Read more

Factors Affecting Selection of Foundation for Buildings?

Image
Factors which affect selection of foundation for a building can be many from the soil conditions to the type of structure and loads from the building. All the factors are considered during selection of foundation for durable building construction. Factors Affecting Selection of Foundation Following are the factors which affect the selection of suitable foundations for building construction: Loads from building Type of soil Type of structures in neighborhood Type of foundations 1. Loads from Building The first factor considered is loads from building on the foundation. This load is a combination of dead load and imposed loads on the buildings. Other loads such as wind loads, earthquake loads, snow loads etc. are also considered based on location. The quantity of loads depends on the type of structure, number of floors and material of construction. As the number of floors increases, the dead load and imposed loads also increase. Choice of material for construction su
Read more

Ceiling types used in Building Construction and their Applications

Image
Various types of ceiling are used in building construction. Applications, aesthetics, advantages and disadvantages of these types of ceilings are discussed in this article. The ceiling of a building form one of the most important structural elements it terms of functionality as well as creativity which in turn bring good aesthetics to the building interior. This document would help you understand ceilings that in turn would help you understand the most suitable options while undertaking either repair or renovation work of our building interior. The ceiling gains a definition, ” A part of a building which encloses and is exposed overhead in a room, protected shaft or circulation space.” It helps us to create an enclosure and separation between spaces. They provide perfect lighting in the room by controlling diffusion of light. It also controls the sound around a room by making the room sound proof. It, therefore, stops the passage of sound between the rooms. Now ceiling also po
Read more

HOW TO DETERMINE DEPTH OF FOUNDATION

Image
Many factors affects the determination of depth of foundation. Calculation for foundation depth is done based on type of soil, ground water table, loads from structure, bearing capacity of soil and other factors. General factors to be considered for determining depth of foundation are: 1. Load applied from structure to the foundation 2. Bearing capacity of soil 3. Depth of water level below the ground surface 4. Types of soil and depth of layers in case of layered soil 5. Depth of adjacent foundation The minimum depth of foundation should be considered to ensure that the soil is having the required safe bearing capacity as assumed in the design. However, it is advised to carry out soil investigation before deciding on depth of foundation. Soil investigation report will suggest the foundation depth based on the type of structure, soil properties, depth of water table, and all other variable that should be considered. Soil investigation report provides bearing capacity of
Read more

WHAT IS VOLUME BATCHING OF CONCRETE AND HOW IT IS DONE IN FIELD?

Image
WHAT IS VOLUME BATCHING OF CONCRETE? Batching of concrete means measuring different ingredients of concrete (i.e. cement, sand, coarse aggregate and water) before mixing it. When this measurement is done on the basis of volume, we call it  Volume Batching . Below are mentioned some of important points to remember before adopting volume batching method in field. Volume batching is not a good method for measuring concrete materials. It is not applicable in case of reinforced concrete structure. This method of concrete batching may not be economical. It can be only used for unimportant concrete or for small concrete works. HOW VOLUME BATCHING IS DONE IN FIELD? Before batching concrete ingredients in terms of volume, we need to know two things. What is the relative proportion of concrete ingredients in terms of volume? What is the water-cement ratio? After knowing these two things you can proceed to batch concrete ingredients in field. The table shown below can be
Read more

Construction Project Management Softwares

Image
Construction PM Software A new wave of web and cloud apps are streamlining communication, simplifying document management, and improving efficiency in construction management.  Here are some of top construction management tools: Smartsheet Smartsheet  is a spreadsheet-inspired work management tool with robust collaboration and communication features. With pre-built construction templates, it’s easy to create a timeline, track progress, manage documents, and organize the details. Gantt charts are automatically created and auto-adjust every time a change is made, so you can share the most up-to-date timeline with team members or stakeholders. You can upload files from your computer, Google Drive, Box, Dropbox, Evernote, or add a web URL, creating a central repository for all project documentation and contracts. Team members can have discussions directly in the sheet and set reminders and alerts, so everyone is on the same page. And lastly, Smartsheet integrates with ot
Read more

Methods of underpinning, Procedure and Applications in Foundation Strengthening

Image
Underpinning is a method for repair and strengthening of building foundations. Underpinning methods, procedures and their applications in strengthening of different types of foundations is discussed in this article. There are situations where a failure in foundation or footing happens unexpectedly after the completion of whole structure (both sub and superstructure). Under such emergency situation, a remedial method has to be suggested to regain the structural stability. The  method of underpinning  help to strengthen the foundation of an existing building or any other infrastructure. These involve installation of permanent or temporary support to an already held foundation so that additional depth and bearing capacity is achieved. Selection of Underpinning Methods Underpinning methods are selected based on age of structure and types of works involved. Structure categories based on its age: Ancient Structures :Age greater than 150 years Recent Structures : Age between 5
Read more

Methods for Calculating Cost of Engineering Consultant Services

Image
here are several methods by which calculation of engineering consultant services cost can be carried out in construction. It is possible to employ various charging approach at different phase of the consultant services. The application of each method or combination of methods is dependent on nature, scope and complexity of the required engineering services. In this article, these charging consulting services are discussed. Following are the topics discussed for calculating cost of engineering services or consulting services in construction: What are the factors that affect the engineering service cost? Methods for charging engineering services What are the Factors that affect the Engineering Service Cost in Construction? There are various factors that control the cost of engineering services required for a specific project. These factors are outlined below: The conditions at project site. Degree of danger that may be encountered and exposure possibility. System of pr
Read more