Introduction and use of tunnel lining trolley-RUILONG GROUP

The tunnel lining trolley is essential equipment used during the secondary lining phase of tunnel construction. This tool is specifically designed for building the concrete secondary lining of tunnel cavities. A concrete lining trolley is a crucial non-standard product utilized throughout the tunnel construction process. Key types of lining trolleys include simple lining trolleys, fully automatic hydraulic drilling rig walking trolleys, and net platform trolleys. The full hydraulic drilling rig lining trolleys can be categorized into various designs such as side arch type, full-round needle beam type, bottom mold needle beam type, and full-round shuttle type. These trolleys are widely employed in the construction of hydraulic tunnels and bridges to enhance slipform, lifting slipform, and casting processes.

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Waterproof Board Trolley

The tunnel lining trolley is necessary for the secondary lining during tunnel construction. It is specifically tailored for constructing the concrete secondary lining of tunnel cavities. The concrete lining trolley serves as an indispensable non-standard product in this phase of construction. The focus is on various types of trolleys, including simple lining, fully automated hydraulic drilling rig walking, and net platform. The full hydraulic drilling rig trolley design can be divided into several categories based on shape and functionality.

Preparation of Main Uses of Commodities

The full-round lining trolley is predominantly used at hydraulic tunnel construction sites where vertical joints in concrete construction are not permitted. It is typically utilized for larger spans of hydraulic tunnels.

The side top arch type and full-circle shuttle type trolleys are commonly used in road, railway tunnel, and underground cavern concrete secondary lining projects.

Product Category Introduction

The standard design scheme for these vehicles is a steel arch platform style that employs standardized combined steel formwork. Unlike fully automatic walking models, they rely on external driving force for movement while detaching the formwork, which is managed manually to enhance labor efficiency. This type of trolley is often used for short tunnel projects, particularly those requiring complex structural designs, frequent process changes, and strict adherence to technology standards. For instance, the Xiaojinkou double-arch tunnel on the Guangzhou-Zhouhui Expressway measures 200m in length and is strategically located at a circular curve transition section with an R=300m radius. Additionally, the tunnel incorporates a plane curve, presenting a hyperboloid shape. The design schema for its second lining utilizes a simple arch trolley, effectively addressing the challenges while minimizing project costs.

In simple trolley applications, concrete is mainly filled using manual labor, compared to more advanced designs like the small Jinkou simple lining trolley, which utilizes concrete delivery pump trucks. Enhanced bending stiffness is critical for these vehicles. Some simple lining trolleys feature comprehensive building formwork but still rely on screw jacks for mold removal, lacking full automation. Such vehicles typically fill concrete with delivery pumps. The widespread use of combined steel formwork in simple lining trolleys, often composed of sheet metal, necessitates careful design considerations around bending rigidity. The spacing of the steel arch frame must not be excessively large; if the length of the formwork is 1.5m, the average spacing of the steel arches should not exceed 0.75m. Vertical connections between formwork should be built between frames, enabling the efficient installation of formwork scaffold fasteners and hooks. When using stirring pumps for concrete infusion, a slower rate is preferred to prevent deformation of the combined steel formwork, particularly for second linings exceeding 500mm in thickness. Careful monitoring of the pouring process is essential to prevent issues such as mold explosions or vehicle deformation.

Analysis on the Design of Tunnel Lining Trolley

The tunnel lining trolley plays a critical role in the secondary lining process, essential for achieving the desired surface shape and dimensions of the tunnel construction. Tunnel lining trolleys are primarily constructed from steel, granting them necessary strength, rigidity, and shape retention.

In tunnel construction, the utilization of concrete for secondary lining is pivotal. With evolving demands, there are new expectations for higher quality and reduced construction time. This trend necessitates the integration of integral steel mold lining trolleys.

The Working Principle of the Tunnel Lining Trolley

The trolley is aligned with the excavation surface on both sides of the formwork. Since the outer contour of the tunnel lining trolley closely mirrors the tunnel’s inner contour, it can create a closed ring with the excavated surface. This allows for efficient concrete pouring to complete the tunnel lining process. In practice, the tunnel lining trolley undertakes several steps: erecting the form, correcting any deviations in center alignment, and securing the form. Ultimately, screws connect the formwork to the frame, facilitating concrete pouring to conclude the construction phases.

Technical Requirements for Tunnel Lining Trolley Design

The technical requirements for designing a tunnel lining trolley predominantly encompass three critical aspects:

(1) The external dimensions of the steel formwork must align with section specifications.

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(2) While in operation, the trolley's steel template mechanisms must complete locking, mold support, and demolding tasks efficiently.

(3) No unique requirements exist for the overall template length and the gantry traveling wheelbase.

Design of Tunnel Lining Trolley

During the design phase, it is crucial to consider the section size, trolley strength, stability, and rigidity post-concrete pouring.

1. Template System Design: The trolley’s formwork system consists of top and side molds. The initial steps involve determining hinge points and ensuring demolding space for the trolley while maintaining the rigidity of the system. Uniform dimensions in railway tunnel sections have been established, necessitating a design focus on the versatility of the top form.

2. Support System Design: The trolley's support system is designed to prevent inward deformation of the molds under pressure and to stabilize the entire formwork system. Adjustable and detachable supports are required, with provisions for possible width adjustments, often necessitating an elongated frame beam with segmented arch designs.

3. Hydraulic System Design: Incorporation of oil cylinders at both ends of the trolley, along with increased joint and tubing counts, is vital. Integration of a ten-link valve will enhance trolley working efficiency while reducing worker workloads.

This overview encapsulates the design considerations of tunnel lining trolleys. Given the advances in technology, it is expected that an increasing number of technical experts will contribute to their design. It is hoped that this article serves as a valuable reference for professionals in the field.

For further information, please visit Steel Tunnel Trolley for Construction (pt, ta, th).