Kerb Height Raising Methodology

Written by Team Highway Correspondence

Updated on:

Kerb Height Raising Methodology

Let’s discuss the Kerb Height Raising Methodology.

During operations, the kerb height may drop below necessary levels. This may be due to:

  1. frequent pave­ment renewals,
  2. e­mbankment settling, or,
  3. Vehicle impacts cause damage.

To fix this, raising the curb height is critical.

To rectify the kerb height under good industry practice and for quality assurance, a procedure is needed. Also, as outlined in Schedule B of CA, under the project’s scope, the concessionaire’s commitment to appropriate quality in conformity with the specifications and standards. Consequently, a detailed method statement for raising curb height is essential.

This article will establish the procedures and methods for the Kerb Height Raising Method. It will collect the concessionaire’s input and observations on the methodology by the IE.

Letter 1: The Kerb Height Raising Methodology Submission.

The following is a sample draft letter format for submission of kerb height-raising methodology. The letter is submitted to the independent engineer. And I am requesting their review and approval of the Kerb Height Raising Methodology. The same has been adopted for the project highway.

To

The Highway Authority,

Subject: Submission of curb height-raising methodology.

Dear Sir,

On the project highway, an asphalt coating reduced the existing kerb height. So, we’ve got a method to bring the curb height back to normal. We’ll use a bond age called Nitobond EP, and we have a plan for raising the median and side kerb. Right now, the curb is under 225 mm.

This is for your kind information and approval, please.

Kerb Height Raising Methodology: 

1.0 General

This work will consist of constructing a cast-in site kerb with M20-grade concrete in the central median and toe. These are in accordance with the specified lines, levels, and dimensions, as well as MORT&H clause 408.

2.0 Purpose

The statement’s primary goal is to raise the median kerb, which BC’s top surface overlay has reduced to a height of 225 mm.

3.0 Material

  1. Concrete requires both coarse and fine aggregates, as well as natural sands.
  2. Cement
  3. Water
  4. Admixtures, bonding agents, curing compounds, etc.

4.0 Traffic Arrangements and Control

  1. We will divert traffic on the carriageway by providing traffic signs and implementing safety measures.
  2. Furthermore, we will place the necessary additional manpower and display boards to regulate traffic flow without causing any congestion, stagnation, or vehicle standstill, ensuring no mitigation occurs.

5.0 Tolerances

The vertical and horizontal tolerances for the true line and level will be +/- 6 mm, as per MORT&H clause 408.5.5.

The drawing for the relaying kerb is as follows:

Kerb Height Raising Methodology

Kerb Height Raising Methodology: Construction Procedure

  1. The task entails identifying sections of the project highway’s carriageway. That is where the height of the existing median kerb above the finished road level is less than 225 mm after the completion of overlay works.
  2. After identification of lengths or stretches, Chipping or dismantling of the kerb (50 mm) is necessary where raising the height of the median kerb or toe kerb is necessary. This will be above the finished road level. For this activity, we will use either mechanical or manual methods.
  3. After the activity at point No. 02 is completed, we will re-lay the kerb along the existing lines. Depending on the site situation, we will either construct the re-laying of the kerb using a kerb-laying machine or by hand.
  4. We will use the Nitobond EP bonding agent as an adhesive at the old median kerb joint. This application is after the chipping and before pouring concrete for the re-laying of the median kerb.
  5. Next, we will treat the concrete with a curing compound to allow it to cure.
  6. Additionally, provide the saw-cut grooves at an interval of 5 m, as specified in clause 408.5.3 of the MORT&H specification.

7.0 Kerb Painting

I will attend the curb pre-painting activities. The activities will include removing all peeling film from existing or old paint removal mechanisms using the appropriate tools and equipment. And duly cleaning the surface before the application of a new coat of paint over the kerb for durability, legibility, and reflectivity as per standards and good industry practices. And the curb painting pattern shall be as per IRC:35.

  • Manpower
  • Site Supervisor
  • Surveyor
  • QA/QC Engineer
  • Mason & Skilled Labour

Equipment, Tools, and Tackles: 8.0

  1. Tools and equipment for dismantling, chipping, and milling the existing median kerb are available. These tools and equipment include jackhammers, concrete cutters, and milling machines.
  2. Tippers to transport debris.
  3. Transit mixer and RMC plant.
  4. The kerb casting machine or shuttering material can be used as required.

9.0 Material

  1. Aggregates: coarse and fine aggregates; natural sand for concrete.
  2. Cement
  3. Water
  4. Admixtures, bonding agents, curing compounds, etc.

Kerb Height Raising Methodology: Nito Bond Application Procedure 

Surface preparation (1.0)

Attention to the substrate’s full and proper preparation is essential for complete repair adhesion.

1.1 Clean all surfaces and remove any dust, unsound materials, oil, paint, or grease.

1.2 Also, roughen the surfaces and remove any laitance. And expose the aggregates by any suitable means.

1.3 Additionally, thoroughly clean the concrete for any other contaminants. Instead, clean the exposed and straightened steel bars until they are uniformly bright. The repair edge should be hardened to provide a good mechanical key at the substrate interface.

2.0 Mixing

2.1 The concrete substrate primer shall be Nitobond EP.

2.2 Ensure that the Mitobond EP is thoroughly mixed.

2.3 To disperse any settlements, stir the “hardener” and “base” components separately before mixing.

2.4 After pouring the entire contents of the ‘hardener’ tin into the base tin, thoroughly mix the two materials for two minutes with a suitable slow-speed drill and mixing paddle to achieve a fully uniform color.

After scraping the sides of the tin, continue mixing for another 2 minutes.

Apply the Nitobond EP as soon as the mixing process is complete.

3.0 Application

3.1 Take care to ensure an unbroken coating.

3.2 Use a suitable brush to scrub Nitobond EP into the surface, ensuring an unbroken film.

3.3 Before placing the repair mortar (ovaries), let the coated substrate sit for two hours.

3.4 You can place the overlay at 40 degrees Celsius within 6 hours. If any doubts arise about temperature, make sure that Nitobond EP is still tacky by physical checking.

3.5 After applying Nitobond EP, make any necessary formwork corrections and secure them in place.

This is for your kind perusal and approval.

[Yours,] [Insert the name of the authorized person].

Note to Visitor

The above-stated procedure for the Nito bond serves as a sample format. The purpose is to make the necessary modifications to meet modern work procedures. And to regularly update specific adhesive manufacturing company guidelines about the product and material.

****************************************************************************************************************************************************************************************************************************************

Letter 2: Review and Observations on Kerb Height Raising Methodology.

Kerb Height Raising Methodology: Review and Observations: The following is a sample draft letter format for independent engineer review and observations on the submission of kerb height raising methodology.

To

The Concessionaire,

Subject: IE review observations and comments on the submitted kerb height-raising methodology.

Dear sir,

We have examined the methodology you provided in your letter. We would like to suggest some changes in the method statement, as outlined below.

Methodology for Re-laying the Kerb

Activity: Re-laying of the kerb

Observations on Kerb height raising methodology

The kerb-height-raising activity on Project Highway is shown in an image.

Kerb Height Raising Procedure and Methodology: Review of Observations

The selection of Kerb Height Criteria for Rectification is underway.

  1. We’ve looked at the information you provided. We believe the best next step is to adjust the curb height. Here are the guidelines to follow:.
    • You can cut the existing kerb’s height from 200mm to 225mm by 50mm. You can then rebuild it to a height of 225mm to align with the new BC overlay level.
    • where the present height of 150mm to 200mm of the existing kerb may be cut by 100mm. The existing kerb may be reconstructed to achieve a height of 225mm, taking into account the new BC overlay level.
    • Lastly, there’s the section of the kerb measuring 100mm to 150mm. Take off a whole 150 mm here. Then, rebuild it to reach a height of 225mm, taking into account the new BC overlay level.
  2. After the work is completed, you must submit the Action Taken Report for our review and records.
  3. Furthermore, we will re-lay the kerb along the lines of the existing kerb when the activity at point No. 02 is complete.
  4. Depending on the site conditions, we will either construct the kerb re-laying using a kerb-laying machine or by hand.
  5. After cutting or chipping the old median kerb, we will use the Nitobond EP bonding agent as an adhesive at the joint before pouring concrete for the new median kerb.
  6. Next, we will treat the concrete with a curing compound to allow it to cure.

Kerb Height Raising: Equipment, Tools, and Tackles.

  1. Tools and equipment, such as jackhammers, concrete cutters, and milling machines, are needed for the dismantling, chipping, and milling of the existing median kerb.
  2. Tippers are used to transport debris.
  3. Transit mixer and RMC plant.
  4. The kerb casting machine or shuttering material can be used as required.

Material

  1. Aggregates: coarse and fine aggregates; natural sand for concrete.
  2. Cement
  3. Water
  4. Admixtures, bonding agents, curing compounds, etc.

Kerb Height Raising Methodology: Conclusion

Therefore, please review and modify your submission before resubmitting it for approval. The submission also includes a drawing of the curb for relaying.

Thank you while ensuring our best services.

[Yours,]

[Insert the name of the authorized person]

Additionally, you can find various sample draft formats for highway operation and maintenance correspondence.

On Project Highway, you can find a sample draft letter format for joint site inspection notification to the concessionaire or contractor. Click here for more information.

Kerb Height Raising Methodology: FAQs

will update shortly

Leave a Comment