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Launching Gantry Crane

A segment launching gantry crane is primarily designed for lifting beam segments from transport vehicles and transporting them to the installation site, where they are then placed onto pre-constructed bridge piers. The construction method employed is known as precast segment assembly, where the beam is divided into several segments. These segments are prefabricated in a factory and transported to the bridge site for assembly. The construction process involves assembling the segments into a complete bridge structure by applying prestress.

Launching Gantry Crane Solution
Launching Gantry Crane Solution

Types of Launching Gantry Crane

When a launching gantry crane is specifically utilized for the construction method of assembling precast segments, it is referred to as a precast segment assembly launching gantry crane. This type of segment launching gantry crane plays a crucial role in efficiently and precisely assembling prefabricated segments to construct bridges.There are many types of segment launching gantry cranes. They can be divided according to the construction method and splicing method of beam blocks.

Types According to the Construction Method

There are two types of segmental assembly launching gantry cranes based on the launching gantry bridge construction method. They are whole span and balanced cantilever T-structure assembly method segmental assembly launching gantry crane.

Whole span Assembly Method Segmental Assembly Launching Gantry Crane

Construction Method

The whole-span segment beams are all suspended on the main load-bearing beam of the launching girder crane, and then placed on the bridge piers after tensioning and prestressing. In another way, it can be closed with the pier top block through cast-in-situ wet joints.

Whole Hole Assembly Method Segmental Assembly Launching Gantry Crane
Whole Span Assembly Method Segmental Assembly Launching Gantry Crane
Advantages of Whole Span Assembly Method Segmental Assembly Launching Gantry Crane

Efficient for shorter spans or projects where the entire bridge can be prefabricated as a single unit. Simplifies on-site construction as the pre-assembled bridge is lifted and launched in one operation. Suitable for simply supported or continuous beams with a span of less than 60 meters.

Balanced Cantilever T-structure Assembly Method Segmental Assembly Launching Gantry Crane

Construction Method

The balanced cantilever T-structure assembly method involves constructing the bridge incrementally from one or both abutments towards the center. The segments are added in a balanced manner on either side of the pier, creating a cantilever structure that gradually meets in the middle.

Balanced Cantilever T-structure Assembly Method Segmental Assembly Launching Gantry Crane
Balanced Cantilever T-structure Assembly Method Segmental Assembly Launching Gantry Crane
Advantages of Balanced Cantilever T-structure Assembly Method Segmental Assembly Launching Gantry Crane

Suitable for longer spans and projects where on-site assembly is preferred. Offers flexibility in adjusting the balance of construction on either side of the pier. Suitable for long-span continuous beams or continuous rigid frame bridges.

Types According to the Splicing Method of Beam Blocks

There are two types of segmental assembly launching gantry cranes based on the splicing method of beam blocks. They are wet joint and dry joint assembly method segmental assembly launching gantry crane.

Wet Joint Assembly Method Segmental Assembly Launching Gantry Crane

Splicing Method

In the wet joint assembly method, the joints or connections between the prefabricated beam segments are filled with wet or fresh concrete. This is typically done on-site, and the concrete in the joints is allowed to cure and bond with the adjacent segments.

Wet Joint Assembly Method Segmental Assembly Launching Gantry Crane
Wet Joint Assembly Method Segmental Assembly Launching Gantry Crane
Advantages of Wet Joint Assembly Method Segmental Assembly Launching Gantry Crane

Ensures a strong and durable connection between segments as the fresh concrete cures and bonds the segments together. Allows for adjustments and fine-tuning during the assembly process.

Dry Joint Assembly Method Segmental Assembly Launching Gantry Crane

Splicing Method

In the dry joint assembly method, the joints between the prefabricated beam segments are left open, without the use of wet concrete. The segments are usually designed with specialized dry joints that provide a secure connection without the need for additional filling.

Dry Joint Assembly Method Segmental Assembly Launching Gantry Crane
Dry Joint Assembly Method Segmental Assembly Launching Gantry Crane
Advantages of Dry Joint Assembly Method Segmental Assembly Launching Gantry Crane

Reduces the need for on-site concrete pouring, streamlining the assembly process. Minimizes the curing time, allowing for faster construction progress.

Models of Launching Gantry Crane For Sale

Aicrane has four models of launching gantry cranes for sale. They share several essential functionalities that make them versatile for segmental assembly and erection projects. These common features include their capability to handle the assembly and erection of segmental box girders with precision, accommodate various feeding methods such as tail bridge deck feeding and simultaneous under-bridge feeding, employ the whole-span construction methodology, and allow for low-position assembly and tensioning. These characteristics collectively contribute to the adaptability and efficiency of this heavy duty gantry crane in a wide range of bridge construction scenarios.

JP50-40 Launching Gantry Crane

The JP50-40 launching gantry crane is specifically designed to meet the demands of assembling and erecting segmental box girders with a span of up to 40m. Employing the whole-span construction methodology, this crane is characterized by its proficiency in low-level hanging assembly and low-level tensioning operations. With a remarkable rated lifting capacity of 50t, the JP50-40 is tailored for projects requiring precision and efficiency in the assembly of shorter span segments.

JP50-40 Launching Gantry Crane
JP50-40 Launching Gantry Crane

JP120-60 Launching Gantry Crane

The JP120-60 launching gantry crane stands out with its ability to handle the assembly and erection of single or double span segmental box girders with a span of up to 60m. It excels in erecting bridge girders for both head and tail spans, allowing for the self-assembly of the block. The crane’s distinctive T-structure symmetrical cable-stayed construction and the capability for in-place assembly and in-place tensioning highlight its versatility. With two main cranes boasting a combined lifting capacity of 120t, the JP120-60 is a robust solution for projects demanding precision and stability in the construction of longer span segments.

JP120-60 Launching Gantry Crane
JP120-60 Launching Gantry Crane
Technical Parameters   Values
Construction Method Segment prefabrication, incremental T assembly, edge-span suspension, self-erecting for block
Tensioning Method High-level tensioning followed by beam lowering
Maximum Bridge Span during Construction (m) Construction of whole span for spans below 60m
Maximum Segment Block Dimensions Length (m) * Width (m) * Height (m)
Maximum Segment Block Weight (t) 1000t/9 units
Bridge Erector Beam Feeding Method Feeding from the rear of the bridge with consideration for both above and below the bridge

JP150-50 Launching Gantry Crane

The JP150-50 launching gantry crane is tailored to meet the challenges of assembling and erecting 50m single-span whole-span segmental box girders directly at the pier top. It excels in erecting both head and tail spans, offering the self-assembly capability of block. This crane is also proficient in wet joint construction, enabling the construction of entire spans at low levels with low-position hanging assembly and tensioning. With a main crane featuring a rated lifting capacity of 150t, the JP150-50 is a reliable choice for projects requiring precise and efficient construction of shorter span segments.

JP150-50 Launching Gantry Crane
JP150-50 Launching Gantry Crane
Technical Parameters   Values
Construction Method Full suspension, on-site tensioning to form simply supported beams
Tensioning Method In-place tensioning
Maximum Bridge Span during Construction (m) 50m
Maximum Segment Block Dimensions Adaptable segment dimensions: Length 3.5m (max); Width 15.6m; Height 4m
Maximum Segment Block Weight (t) Maximum block weight: 102t (excluding rigging)
Bridge Erector Beam Feeding Method Feeding from below within the span or rear feeding

JP180-50 Launching Gantry Crane

The JP180-50 segment launching gantry crane is engineered to meet the demands of segmental beam erection for spans below 50m, incorporating tail bridge deck feeding and precision adjustment of segment block posture. Beyond assembly, it is capable of binding reserved reinforcement between segment blocks, installing templates, pouring wet joint concrete, and conducting whole-span tensioning to complete the entire span construction. Operating with low-position hanging and tensioning, the JP180-50, featuring one main crane with a rated lifting capacity of 180t, is a reliable solution for projects requiring meticulous construction below 50m span segments.

JP180-50 Launching Gantry Crane
JP180-50 Launching Gantry Crane
Technical Parameters   Values
Construction Method Whole span assembly
Tensioning Method Original in-place tensioning
Maximum Bridge Span during Construction (m) Construction of whole span for spans below 50m
Maximum Segment Block Dimensions Adaptable segment dimensions: Length 12m; Width 2m; Height 2.7m
Maximum Segment Block Weight (t) Maximum block weight: 1800t for 11 segments
Bridge Erector Beam Feeding Method Feeding from the rear of the bridge with consideration for both above and below the bridge

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Applications of Launching Gantry Crane

The launching girder crane finds diverse applications in the assembly of various bridge types, including railway bridges, highway bridges, and urban elevated structures, such as light rail and elevated roadways. Specifically, its applications can be summarized as follows:

  • Railway Bridge Segment Assembly: Segment launching gantry cranes are employed for the precise assembly of prefabricated segments in railway bridge construction. They lift and position beam segments, contributing to the efficient and accurate construction of railway bridges.
  • Railway Bridge Segment Assembly
    Railway Bridge Segment Assembly
  • Highway Bridge Segment Assembly: In the construction of highway bridges, launching gantry cranes play a vital role in the assembly of prefabricated segments. They lift and transport these segments to the designated installation points, facilitating the rapid and systematic construction of highway infrastructure.
  • Highway Bridge Segment Assembly
    Highway Bridge Segment Assembly
  • Urban Elevated Structures Segment Assembly: Launching gantry cranes are utilized for the assembly of prefabricated segments in the construction of urban elevated structures, including light rail tracks. These cranes assist in lifting and placing segments in a controlled manner, ensuring the seamless construction of elevated transportation infrastructure within cities.
Urban Elevated Structures Segment Assembly
Urban Elevated Structures Segment Assembly

In summary, the launching gantry crane serves as a versatile and essential tool in the construction of various types of bridges, contributing to the efficiency, precision, and safety of assembling prefabricated segments in railway, highway, and urban elevated projects.

Bridge Construction Solution

Aicrane is a professional lifting equipment manufacturer. We provide customized and combined solutions for different industry. For bridge construction industry, we can provide the combination of straddle carrier, hydraulic transporter and segment assembly launching gantry crane as a solution. They can be combined to transport the precast concrete beams from the prefab yard to construct site and then construct the bridge.

Hydraulic Transporter & Cross-line Straddle Carrier Crane Solution
Hydraulic Transporter & Cross-line Straddle Carrier Crane Solution

The tyre-based straddle carrier crane serves to efficiently handle and position prefabricated concrete beams in the prefab yard . This rubber tyred gantry crane helps to relocate beams, load them onto hydraulic transporters.

The hydraulic transporter can transport the concrete beams to the construction site. Depending on the bridge types, it can provide the beams for cross-line straddle carrier to build lower bridge like overpass. Or it can provide the beams for launching gantry crane to build higher bridge like railway bridge.

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Features of Prefabricated Segment Assembly Launching Gantry Crane

The prefabricated segment launching gantry crane has several notable features:

  • Minimal Impact on Traffic and Environment During Construction: The construction process using this gantry crane minimizes disruptions to traffic and the surrounding environment. Its efficiency in segment assembly contributes to a reduced impact on urban infrastructure and the environment.
  • Lightweight and Compact Segment Design for Easy Transportation: The prefabricated segments are characterized by their lightweight and compact dimensions, facilitating convenient transportation. This feature enhances logistical efficiency during the delivery of segments to the construction site.
  • Fast Assembly Construction Speed: The gantry crane enables rapid assembly construction, enhancing overall project efficiency. Its ability to quickly lift and position prefabricated segments contributes to accelerated construction timelines.
  • Reduction in Concrete Shrinkage and Creep After Installation: The use of this crane can significantly decrease the effects of concrete shrinkage and creep after bridge installation. This ensures the long-term stability and structural integrity of the constructed bridge.
  • Suitable for External Prestressing: The crane is well-suited for external prestressing, allowing for the reduction of beam cross-sectional dimensions and the optimization of material usage efficiency. This feature contributes to a more economical and resource-efficient construction process.

In summary, the prefabricated segment assembly launching gantry crane offers a combination of quality, efficiency, and environmental considerations, making it an ideal choice for constructing urban elevated bridges, where minimizing disruption and ensuring structural integrity are crucial considerations.

Main Components of Segment Assembly Launching Gantry Crane

The segment assembly launching gantry crane is composed of several main components, each serving a specific function in the efficient assembly of bridge segments. Here are the key components based on the information provided:

  • Machine Arm: The machine arm, or gantry structure, is a critical component that spans the width of the construction area. It provides the main framework and support for other components, allowing for horizontal movement along the bridge alignment.
  • Front Supporting Legs, Middle Supporting Legs, and Rear Supporting Legs: These supporting legs provide stability to the gantry crane during the lifting and positioning of bridge segments. They are strategically positioned to distribute the load and maintain balance during operation.
  • Lifting Trolley: The lifting trolley is responsible for raising and lowering the prefabricated bridge segments from the hydraulic transporter. It moves along the gantry structure and is equipped with the necessary mechanisms to hoist and position the segments accurately.
  • Suspension and Adjustment Beam System: This system includes components for suspending and adjusting the lifting equipment. It ensures proper alignment and balance during the lifting and transportation of bridge segments.
  • Support Leg Traction Mechanism: The support leg traction mechanism is responsible for moving and adjusting the supporting legs. This allows for fine-tuning the position of the gantry crane and ensures stability during different phases of the segment assembly process.
  • Hydraulic System: The hydraulic system provides the necessary power for various functions, such as lifting, adjusting, and moving components of the crane. It plays a crucial role in ensuring the smooth and controlled operation of the gantry crane.
  • Electrical System: The electrical system includes components such as control panels, sensors, and other electrical elements that manage and monitor the crane’s operations. It facilitates precise control, safety features, and communication between different crane components.
Main Component Design of JP 180-50 Launching Gantry Crane
Main Component Design of JP 180-50 Launching Gantry Crane

These components work in harmony to enable the segment assembly launching girder crane to lift, transport, and position prefabricated bridge segments with precision and efficiency during the construction process.

Advantages of Aicrane

Aicrane is a reliable crane manufacturer and lifting solution provider. Here are some of the advantages of Aicrane.

  • Customization Capabilities: Aicrane excels in providing customized crane solutions, collaborating closely with clients to understand unique challenges and offering tailor-made designs that enhance operational efficiency.
  • Engineering Expertise: A dedicated team of skilled engineers and technicians at Aicrane ensures a commitment to engineering excellence. This expertise enables the delivery of reliable, high-performance lifting solutions tailored to the specific needs of clients.
  • Aicrane Professional Engineers
    Aicrane Professional Engineers
  • Comprehensive Product Range: We offer a diverse product portfolio, including gantry cranes, overhead cranes, winch, marine travel lift and more. This comprehensive range allows us to cater to a wide spectrum of industries and applications, providing solutions for various lifting needs.
  • Customer-Centric Approach: Aicrane prioritizes customer satisfaction through effective communication, transparency, and collaboration throughout the project lifecycle. Our customer-centric approach ensures that clients receive personalized solutions and exceptional service.
  • service
    service engineers
  • Global Presence: With a worldwide presence, Aicrane serves clients globally, establishing ourself as a reliable and trusted partner in the lifting equipment industry. This international reach enables us to understand and meet the specific demands of different regions and industries.
Aicrane Subcompany in Uzbekistan
Aicrane Subcompany in Uzbekistan
Aicrane Subcompany in Indonesia
Aicrane Subcompany in Indonesia

In essence, Aicrane stands as a trusted industry leader, offering not only superior lifting equipment but also a commitment to innovation, customization, and customer satisfaction. Our advantages lie in our technical prowess, commitment to quality, and the ability to deliver comprehensive lifting solutions that address the unique challenges of diverse industries.

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    FEW TIPS

    1.Construction Method: T-symmetrical assembly or full-span assembly?

    2.Bridge Section Dimensions: L(m)*W(m)*H(m)?

    3.Maximum Bridge Span: (m)?

    4.Weight of Full-span Beam: (t)?

    5.Maximum Segment Block Dimensions: L(m)*W(m)*H(m)?

    6.Maximum Segment Block Weight: (t)?

    7.Number of Suspended Full-span Segment Blocks: ?

    8.Beam Feeding Direction: Behind the bridge or under the bridge?