Established in 2007, National Power Engineering Company (NPEC) is a dedicated steel fabrication and engineering company that offers tailor-made tunnel and bridge formwork solutions for the infrastructure, railway, highway, irrigation, hydroelectric, and underground construction industries. With structural engineering and project-specific design expertise, NPEC provides high-quality, reliable formwork systems for demanding construction applications.

Tunnel & Bridge Formwork Manufacturer – NPEC

NPEC provides engineering formwork and fixing systems. NPEC products include hydraulic tunnel formwork, railway tunnel formwork, bridge builder formwork, pier shutters, circular shutters, flat shutters, I-girder shutters, box-girder shutters, curb shutters, culverts, and chutes.

We can produce formwork to the specified geometry, size, lining pattern, construction methodology, and site conditions. NPEC has evolved from a bridge-shutter fabricator to a designer and fabricator of sophisticated tunnel formwork gantries. The company profile notes capabilities for tunnel formwork gantries up to 16 m high and 20 m wide. However, the current tunnel-gantry range is approximately 3.3 m to 20 m in diameter, depending on the project. 

While from standard shutters to complete bridge builders to specialised hydraulic tunnel formwork lining structures, NPEC offers fabricated products that are dimensionally precise, durable, and aligned with project schedules.

 

Formwork Solutions at a Glance

Formwork Solution	Application / Purpose
Hydraulic Tunnel Formwork	Tunnel lining and underground construction with hydraulic positioning and movement
Railway Tunnel Formwork	Railway and rail-related tunnel construction based on tunnel profile and lining requirements
Bridge Builder Formwork	Bridge construction and segmental bridge applications
Pier Shutters	Forming bridge piers and structural supports
Circular Shutters	Cylindrical and circular concrete structures
Flat Shutters	Flat concrete surfaces and structural components
I-Girder Shutters	I-girder fabrication and bridge construction
Box-Girder Shutters	Box-girder bridge components and structural concrete works
Kerb Shutters	Kerbs and edge construction
Culverts	Culvert and drainage structures
Chutes	Specialized concrete and material-transfer applications
Slip Form Shutters	Continuous or repetitive concrete construction requiring controlled shutter movement

 

Hydraulic Tunnel Formwork Systems

NPEC manufactures and supplies hydraulic tunnel formwork for Tunnel and Underground Lining applications, with a reliable, controllable operating system, precision-controlled positioning, and high-quality formwork/shuttering finishes. 

NPEC tunnel formwork solutions are based on the tunnel shape and the concrete lining task. NPEC certainly delivers all-mechanical or hydraulically driven lining formwork systems, or a combination of both, depending on the project's specific requirements. Our current range of tunnel-gantry formwork includes designs from around 3.3 m to 20 m in span with tailor-made tunnel profiles and applications.

Customised Hydraulic Tunnel Gantry Design

Every tunnel construction project is unique and can include a variety of diameters and cross-sectional sizes, lining thicknesses, excavation types, and available working space and environs. NPEC designs all our tunnel formwork and gantry systems based on your project specifications, rather than designing everything around a single standard.

Our designs include horseshoe-type tunnel gantries, modified horseshoe tunnel gantries, D-type tunnel gantries, Bell Mouth tunnel gantries, Cavern gantries, pocket-type gantries, T-junction gantries, Y-junction gantries, Mechanical tunnel formwork, Hydraulic tunnel formwork, Self-propelled hydraulic tunnel formwork, and mechanical and hydraulic combinations.

We also produce related underground construction equipment and support structures, such as TBM reaction frames, TBM cradles, and D-frames, designed to fit your specific project needs and local conditions.

 

Hydraulic Formwork for Different Tunnel Applications

Our tunnel formwork solutions can be engineered for all kinds of railway tunnels, highway tunnels, irrigation tunnels, hydroelectric and powerhouse tunnels, NATM projects, and several other underground infrastructure projects. NPEC's current project portfolio mostly consists of hydraulic tunnel gantries and formwork supplied for projects in West Bengal, Odisha, Himachal Pradesh, Uttarakhand, Mumbai, and other locations. 

For example, NPEC's completed-project archives include hydraulic tunnel gantries for the Rishikesh-Karnaprayag tunnel project, Sungal Tunnel, Lakhwar, Sevoke-Rangpo, and various other infrastructure projects. The present website archives the hydraulic tunnel gantries supplied for the Mumbai-Ahmedabad High Speed Rail project.

This project experience demonstrates NPEC's ability to manufacture large, technically challenging shuttering and gantry systems for underground construction.

 

Railway Tunnel Formwork 

Tunnel construction and lining railway tunnels demand formwork solutions that reliably maintain the tunnel section profile and support efficient production of tunnel lining concrete.NPEC's railway tunnel formwork is based on tunnel geometry, lining specifications, construction method, and operating conditions.

NPEC offers specialised tunnel construction formwork systems, including customised forms for tunneling and tunnel lining in rail and rail-related facilities. The tunnel-gantry application portfolio includes standard forms for producing railway tunnels, as well as specialised underground construction methods and applications. Currently, our tunnel-gantry strengths include rail tunnels as well as highway, irrigation, and hydroelectric tunnels.

 

Formwork for Railway Tunnel Construction

At times, the railway tunnel formwork system might have to cater to the following:

• Tunnel diameter and shape of cross section 

• Concrete lining thickness 

• Length of casting needed 

• Tunnel curve or shape of tunnel 

• Construction stage: hydraulic or mechanical shutter travel 

• Available work space on site 

• Conditions for moving and assembling on site 

• Repetition and cycle needs 

• How it fits with other tunnelling equipment

Because of NPEC's general arrangement and hydraulic design capability, the formwork system can be designed to these project parameters. This integrated approach can co-ordinate the structural frame, shuttering configuration, and hydraulic actuation system during manufacturing.

In addition, NPEC has installed tunnel formwork and gantry equipment for railway projects. Recent projects listed on the NPEC website include hydraulic tunnel gantries for the Mumbai-Ahmedabad High Speed Rail Project and the Sevoke-Rangpo New BG Line Project (two-shutter and single-traveller hydraulic tunnel formwork for 7.12 m dia. Tunnel).

 

Railway Tunnel Gantry and Lining Systems

For all kinds of railway tunnel projects, NPEC can seamlessly develop a system suited to the overall required lining process and tunnel profile. The main objective is to provide a formwork arrangement that allows the shutter to be positioned precisely for concrete placement and then moved for the next casting cycle. 

Depending on project specifications, NPEC can provide hydraulic or mechanical arrangements and specialised configurations for unique tunnel shapes. The company's strong ability to manufacture customised tunnel gantries makes the system well suited for projects where standard formwork dimensions may not be sufficient. 

 

Bridge Builder Formwork for Segmental Construction

NPEC supplies Bridge Builder Formwork and overall bridge builder fabrication solutions for any project specifications. Bridge Formwork includes: bridge builder formwork, pier shutters, circular shutters, flat shutters, I-girder shutters, box-girder shutters, kerb shutters, culverts and chutes. 

Bridge formwork manufacturing requires designing and manufacturing formwork with precise measurements. Even slight measurement differences can affect the shape, line, and level of the concrete, as well as the construction process. NPEC ensures fabrication accuracy and meets project requirements in bridge formwork manufacturing. 

 

Complete Bridge Builder Formwork Solutions 

NPEC also offers a complete range of fabricated shuttering components to assist bridge builders, including: 

• Bridge Builder Formworks 

• Pier Shutters 

• Circular Shutters 

• Flat Shutters 

• I-Girder Shutters 

• Box-Girder Shutters 

• Kerb Shutters 

• Culverts 

• Chutes 

The above products can be fabricated as per the drawings, dimensions, and construction specifications. According to the company website, a shuttering project for one of the client's Agucha mines involved fabricating a 9 m diameter by 6 m high circular shutter, with the delivered product carrying a 3 mm tolerance. 

 

Bridge Shutters for Different Structural Requirements

Different bridge types use different framing elements and concrete form configurations. A pier shutter, for example, may be quite different from an I-girder or box-girder shutter. Circular (or curved) formwork also shapes cylindrical or other curved structures. 

Flat formwork is used where flat concrete surfaces are necessary. NPEC's formwork manufacturing capability can be tailored to the specific needs of a particular application. This can include manufacturing bridge-related formwork and shutters, as well as supporting infrastructure like culverts or chutes.

The new project information NPEC supplied with this article also includes the company's work supplying and manufacturing I-girder shutters at Siliguri.

 

Slip Form Shutters – Design & Fabrication

Slip form shutters are used when continuous or repetitive concrete construction requires a controlled shuttering system. NPEC provides customised steel fabrication and shuttering solutions based on the project's geometry and construction requirements. 

Slip-form shutter design requires consideration of the intended concrete profile, structural loads, dimensional requirements, movement arrangement, access, and site conditions. With other NPEC formwork systems, fabrication can be developed seamlessly around project-specific drawings and specifications.

 

Customised Shutter Fabrication

NPEC's formwork capabilities extend beyond standard tunnel and bridge applications. At times, the current formwork portfolio includes circular, flat, pier, girder, curb, and specialized shutters, enabling the company to manufacture components for a wide range of civil and infrastructure requirements. 

Some of the recently completed projects that NPEC lists include the supply and fabrication of

• Pier trestle shutters in Assam; circular shutters in West Bengal 

• I-girder shutters in West Bengal; 

• Tetrahedron formwork in West Bengal

• Well Kerb shutters in West Bengal

• Shaft shutters in West Bengal

These projects demonstrate NPEC's experience fabricating unique shuttering geometries for specialised construction requirements.

NPEC Formwork Manufacturing Capabilities

In-house engineering and fabrication resources mostly support NPEC's formwork manufacturing capability. The company operates a 275,000-square-foot workshop, mostly equipped for large-scale engineering and fabrication work, with branches in Siliguri, Jaipur, and Visakhapatnam serving projects across India. 

NPEC was formed in 2007 as an engineering-services company through National Commerce House Pvt. Ltd., formed in 1941. According to NPEC's company profile, the company has fabricated around 30,000 mt, and has developed from bridge shutter fabrication into designing and fabricating tunnel formwork gantries.

This is an engineering, structural fabrication and machining company, allowing NPEC to manufacture proprietary formwork systems, where structural fabrication and engineering are critical.

 

Formwork Products Manufactured by NPEC

NPEC provides a diverse range of shuttering and formwork products for infrastructure and construction projects.

Formwork Product	Typical Application
Bridge Builder Formworks	It is required for Bridge construction and segmental applications
Pier Shutters	Required for Bridge piers and structural supports
Circular Shutters	Circular and cylindrical concrete structures
Flat Shutters	Flat concrete surfaces and structural components
I-Girder Shutters	Mostly required for I-girder fabrication and bridge construction
Box-Girder Shutters	Box-girder bridge components
Kerb Shutters	Kerb and edge construction
Culverts	Culvert and drainage structures
Chutes	Concrete and material transfer applications
Tunnel Formwork	Tunnel lining and underground construction
Hydraulic Tunnel Gantries	Mechanized tunnel lining operations
Mechanical Tunnel Formwork	Tunnel construction requiring mechanical movement

 

Why Choose NPEC for Tunnel and Bridge Formwork?

When choosing formwork for your infrastructure project, it's never just about recommending a steel shutter. A formwork system must conform to the profile, phasing, site access, and tolerances required. Our design, engineering and manufacturing teams collaborate to tailor-make your formwork system. 

Critical capabilities include the following.

Project-specific Engineering - We can develop formwork around the client's drawings, tunnel profile, dimensions, and construction method.

Hydraulic and Mechanical Systems - NPEC can manufacture fully hydraulic, mechanical, or combined systems, depending on the project requirements.

Large-format Fabrication - At times, the company's capabilities extend mostly to large tunnel gantries and specialised structural formwork.

Dimensional Accuracy - However, NPEC's Agucha mines circular-shutter project demonstrates fabrication to a stated +3mm tolerance for atleast a 9mmeter diameter and 6-meter-high shutter. 

Nationwide Project Capability - NPEC do operate from Siliguri, Jaipur, and Visakhapatnam and serves numerous projects across India.

Integrated Engineering Capability - NPEC certainly maintains structural and hydraulic design capabilities for all kinds of tunnel gantries and related systems.

 

Customised Tunnel & Bridge Formwork for Your Project

Powered by our in-house structural and hydraulic design teams, extensive manufacturing facilities, and experience in both tunnel and bridge projects, we can engineer a formwork system to your project's geometry, design, and construction specifications, and deliver it as a fabricated solution to ensure efficient delivery. 

From hydraulic tunnel formwork and railway tunnel formwork to bridge builder formwork and slip-form shutters, NPEC manufactures formwork solutions for challenging infrastructure projects. 

 

Frequently Asked Questions

 

What tunnel formwork products does NPEC produce?

NPEC produces to order a range of hydraulic, mechanical and combined tunnel formworks: horseshoe, modified horseshoe, D-shape, bell mouth, cavern, pocket, T-junction and Y-junction.

Does NPEC manufacture hydraulic tunnel formwork?

Yes. NPEC supplies and manufactures tailor-made formwork for flyover tunnels and port tunnels, and tailor-made tunnel gantries for tunnel construction, based on tunnel section, tunnel lining, and site conditions.

Does NPEC provide railway tunnel formwork?

Yes. NPEC supplies tunnel gantry and formwork systems for rail tunnel construction and has executed projects related to railway infrastructure, such as the Mumbai-Ahmedabad High Speed Rail project and the Sevoke-Rangpo New BG Line project.

What bridge formwork products does NPEC manufacture?

NPEC produces Bridge Builder Formworks, pier shutters, circular shutters, flat shutters, I-girder shutters, box-girder shutters, kerb shutters, culverts and chutes.

Can NPEC fabricate customized shutters?

Yes. NPEC has manufactured shutters to project-specific dimensions and specifications. The website currently lists the following types of custom circular, pier, I-girder, well curb, and shaft shutter projects.