Highway Tunnel Trolley

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Brand:Lijian

Min. Order:1 Set/Sets

Transportation:Ocean,Land

Packaging:According to customers request

Supply Ability:40 days after receive the order

Place of Origin:China

Productivity:T/Year

Working Principle of Tunnel Lining Trolley First of all you should know the structure of the trolleyHydraulic and mechanical can be selected. After analysis and comparison, the hydraulic type has low requirements for rigidity of the trolley frame,...

Tunnel Trolley ing trolley working principle

 

The tunnel lining trolley is the equipment that must be used in the secondary lining of the tunnel construction process, and is used for the lining construction of the inner wall of the tunnel. It is an indispensable non-standard product for secondary lining during tunnel construction. It mainly consists of simple lining trolley, hydraulic automatic walking lining trolley and grid lining trolley. The hydraulic lining trolley can be further divided into a side arch type, a round needle beam type, a bottom mold needle beam type, a round through type and the like. Lifting slipforms, jacking slipforms and overturning are also commonly used in hydraulic tunnels and bridge construction.

The specific models of the tunnel two-lined trolleys are divided into various types. Under normal circumstances, the tunnels can be divided into two types: the ordinary two-line trolleys, the ordinary highway two-line trolleys, and the expressway double-line. Trolley, expressway three-line trolley, ordinary railway single-line trolley, high-speed railway trolley, water conservancy and hydropower diversion tunnel trolley, mine roadway trolley, subway lining trolley, and inner and outer mold lining trolley.

According to the specific lining length of the tunnel two-liner, it can be divided into: 6 meters, 9 meters, 12 meters, 15 meters, etc., the length of the second lining, the length of the tunnel for the actual construction is the length of the tunnel. standard.

Available in hydraulic and mechanical versions. After analysis and comparison, the hydraulic type frame has low rigidity requirements, flexible structure and light weight, low processing requirements and high elevation requirements for laying tracks during construction. It is easy to use, but has high self-locking requirements for hydraulic cylinders. The hydraulic cylinders in the lining are not. Allow retraction. The mechanical type is the opposite. Since several motors need to drive several screw drives, the coaxiality of each drive shaft is high, and the frame must have a large rigidity, the structure size is accurate, due to the heavy structure and high processing requirements. Moreover, because the lead screw is synchronous (not like hydraulic transmission, each hydraulic cylinder can be synchronized or single-acting), when the track elevation error (each point is not at the same level) is large, it will directly affect the position of the template, thus affecting the quality of the lining. .

After the analysis and comparison, the hydraulic transmission scheme is adopted, and the hydraulic cylinder adopts hydraulic lock and balance valve to make the hydraulic cylinder self-locking; at the same time, the screw mechanism is used for mechanical locking, and the support of the template is strengthened to ensure that the template does not return when lining Shrink, no deformation. Practice has proved that the lining trolley is hydraulically reasonable and is the development direction.

The tunnel lining trolley is the construction equipment for pouring the secondary lining concrete of the tunnel. It cooperates with other auxiliary machinery, which can reduce the labor force, improve the mechanization rate of the second lining construction of the tunnel, improve the construction progress, and has low input cost, firm structure, convenient operation and tunnel. The molding surface is good, and so on, it is widely used in highway, railway, water conservancy and hydropower, municipal, anti-military and other engineering construction.

According to the tunnel project, the lining trolley is divided into a side arch type, a straight wall variable section side arch type, a mutant face type, a round needle beam type, a round through line type and the like. According to the actual needs of users, the hydraulic self-propelled, hydraulic drag type, mechanical steel formwork, simple combination formwork and other types can be selected by motor. The length of the trolley can be selected from 6 meters, 7.5 meters and 9 meters depending on the length of the tunnel and the construction period. 10.5 meters, 12 meters, etc.

To sum up: the specific model of the tunnel two-lined trolley is based on the bending dimension and section size of the actual construction structure.

Detailed introduction of tunnel lining trolley

The entire mass of the tunnel lining trolley is transmitted to the supporting organization through the steel mold of the trolley, and then to the portal frame. The lining concrete is in a solid-liquid state. Large vertical pressure and lateral pressure are generated on the top and side, and a large buoyancy occurs together. When the buoyancy exceeds the straight pressure and the weight of the trolley, the trolley will float up. It will not work normally.

In order to deal with this technical problem, after careful calculation, optimized planning, and reasonable selection of each supporting position. That is, the lower longitudinal beams inside the mast are supported on the ground to prevent the side pressure from causing the mast columns to retract, and there are several horizontal supports on the outer side of the mast and the longitudinal beams of the side form, at the upper beam and the upper longitudinal beam of the mast. Several straight supports are selected (the top hydraulic cylinders are arranged on the horizontal part of the gantry at both ends, and the center is a straight supporting screw), which is uniformly distributed in the longitudinal direction of the trolley.

 

The hydraulic cylinder is determined by hydraulic lock, and the supporting screw is used for mechanical determination, which ensures that the hydraulic cylinder will not retract and the template will not be deformed during the lining construction. Tunnel lining trolley: Lining formwork trolley (referred to as trolley) is the construction equipment for pouring the secondary lining concrete of the tunnel. Cooperating with other auxiliary machinery, it can greatly reduce the labor force, improve the mechanization efficiency of the second lining construction of the tunnel, and improve the construction progress. It has investment It has the advantages of low cost, reliable structure, convenient operation, and good tunnel forming surface. Therefore, it is widely used in the construction of highways, railways, hydropower, municipal, national defense, and other projects.

The tunnel lining trolley is a special equipment that must be used in the secondary lining of the tunnel construction process, and is used for the concrete lining construction of the inner wall of the tunnel. In the construction of hydraulic tunnels and bridges, lifting slipforms, jacking slipforms and overturning forms are also commonly used. The tunnel lining trolley is a special equipment that must be used in the secondary lining of the tunnel construction process, and is used for the concrete lining construction of the inner wall of the tunnel.

 

The tunnel lining trolley adopts hydraulic transmission, which simplifies the structure of the trolley frame and reduces the weight. At the same time, it also improves the flexibility and diversity of the structure. After the analysis and comparison of various trolley frame structure schemes, the strength calculation and optimization select 9m four doors. With a 12m main portal structure, its structural weight is reduced by more than 40% compared with the mechanical type, and the production cost is reduced by more than 25%.

The steel mold is the working device of the tunnel lining trolley. Its appearance quality and dimensional accuracy directly determine the quality of the concrete lining. At the same time, it is also a difficult part to process. A reasonable processing and welding process has been formulated, and special assembled welded tires have been designed and processed. Die to ensure the accuracy of the overall dimensions, minimize welding distortion, and ensure that the outer surface is smooth and free of defects such as unevenness.

In order to control the misalignment of adjacent templates, the stabilizing pins of interference fit are used to fix the connecting plates of adjacent templates as a whole, which effectively controls the problem of misalignment of adjacent templates caused by the gap between the bolt holes.

Brief Introduction of Tunnel Lining Trolley

Brief Introduction of Tunnel Lining Trolley

 

 

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The tunnel lining trolley is a special equipment that must be used in the secondary lining of the tunnel construction process, and is used for the concrete lining construction of the inner wall of the tunnel. Concrete lining trolley is an indispensable non-standard product for secondary lining during tunnel construction. It mainly includes simple lining trolley, fully hydraulic automatic walking lining trolley and grid-frame lining trolley. Full hydraulic lining trolley can be divided into side-top arch type, full circle needle beam type, bottom mold needle beam type, full circle travel type, etc. In the construction of hydraulic tunnels and bridges, lifting slipforms, jacking slipforms and overturning forms are also commonly used.

Product Usage

The full-circle lining jumbo is often used in hydraulic tunnel construction. The tunnel is not allowed to have longitudinal joints for concrete construction. It is generally used when the hydraulic tunnel has a large span

Use full-circle travel type; side-top arch lining trolley is the most common application, often used in the construction of concrete secondary lining of highway, railway tunnel and underground cavern.

 

Product Classification Introduction

Simple

The trolley is generally designed as a steel arch type, using a standard combined steel template, without automatic walking, using external power to drag, and the detachment template is all manually operated, which is labor-intensive. This type of lining trolley is generally used for short tunnel construction, especially for tunnel concrete lining construction with complex plane and space geometry, frequent process conversion, and strict process requirements. Its advantages are more obvious. The second tunnel reinforced concrete lining adopts a simple arch frame design, which solves these problems well, and at the same time, the engineering cost is low. Most of the simple trolleys use artificial concrete pouring, and the simple lining trolley is filled with concrete conveying pump trucks, so the rigidity of the trolley should be particularly strengthened. Some simple lining trolleys also use integral steel formwork, but they still use threaded rods and do not move automatically. This type of trolley is generally filled with concrete delivery pump trucks. Simple lining trolleys generally use combined steel formwork. Combined steel formwork is generally made of thin plates.

 

The rigidity of the steel formwork should be considered in the design process, so the spacing between steel arches should not be too large. If the length of the steel formwork is 1.5m, the average spacing between the steel arches should not be greater than 0.75m, and the longitudinal joint of the steel formwork should be set between the push and the push to facilitate the installation of formwork fasteners and formwork hooks. If the pump is used for infusion, the infusion speed should not be too fast, otherwise it will cause deformation of the composite steel formwork, especially when the lining thickness is greater than 500mm, the infusion speed should be slowed down. Be careful when capping and pouring. Pay attention to the pouring of concrete at all times to prevent the concrete pouring after filling, otherwise it will cause mold explosion or deformation of the trolley.

 

Full hydraulic

It is mainly used in the construction of medium and long tunnels, with high requirements for construction progress and concrete surface quality. This type of lining trolley is designed as an integral steel formwork, hydraulic cylinders to be released from the vertical mold, and supported by screw rods during construction, electric reducer automatic walking or cylinder stepping automatic walking, all are filled with concrete conveying pump trucks. Most lining trolleys are of this type. When designing this type of lining trolley, in the case of meeting the clearance requirements, the installation position of the lower part of the oblique support inside the mast should be considered, as close as possible to the lower part of the column, so that it can bear the best force. The portal beam should be high enough, not less than 400mm for conventional railway tunnels, and not less than mm for highway tunnels. The minimum adjustment distance between the end face of the formwork and the door frame is not less than 250mm, otherwise it will cause difficulty in overlapping the front and rear lining sections.

 

 

When using this type of lining trolley, it should be noted that the laying height difference of the running rails on both sides is not more than 1%, otherwise it will cause the deformation of the screw jack and the jacking cylinder. When lining a tunnel with a ramp, in order to adjust the lining elevation, the height difference between the front and rear ends of the trolley will be caused, and the end face of the formwork and the end face of the gantry will not be parallel, which will cause a large horizontal force to be formed between the formwork and the gantry. The supporting screw rod between the template and the mast is misplaced, causing damage to the jack and the cylinder. Therefore, in the design, full consideration should be given to the restraint structure or adjustment system of the horizontal component caused by the height difference between the front and rear. When positioning the vertical mold, a rail clamp must be installed, and the foundation screw jack, the gantry jack and the template jack must be tightened. If necessary, other measures can be used to reinforce the position of the arch foot of the lower mold so that the gantry is fully stressed. May be small to prevent mold running and mast deformation.

 

Grid

Compared with the traditional lining trolley, the structure of the grid-frame lining trolley has been greatly changed. In the construction of the traditional lining trolley, the trolley's mast is a stress-bearing part, and it is subject to greater lateral pressure, which produces unequal deformations with the rigidity of the mast, and it is not suitable for direct work in tunnels with large transverse and longitudinal slopes , It has high requirements on the working environment, otherwise it will cause the overall deformation and damage of the trolley. The main frame of the grid-type lining trolley is a non-stressed part during construction. The support of the formwork is the ground screw jack of the side mold arch foot. The main frame is only stressed during the process of removing the standing form and walking. The force is vertically downward, there is no side pressure, and the mast is designed with sufficient rigidity according to the weight of the trolley to prevent deformation. When constructing or walking in a tunnel with a ramp, whether it is a horizontal slope or a longitudinal slope, the height can be adjusted by the jacking cylinder at the lower part of the mast, so that the entire trolley is in a horizontal state, and the entire trolley does not have forward tilting force.

 

And the roll force ensures the overall stability of the trolley. Because the trolley completely eliminates the screw jacks used for support, the trolley is simple to locate and can be adjusted to the lining geometric position very quickly, saving a lot of manpower and material resources, improving work efficiency, shortening the work cycle period, and correspondingly saving engineering cost.

In order to ensure the rigidity and strength of the top arch formwork, the upper frame is designed as a grid-type rod structure to make it bear the best force and the formwork will not be deformed and displaced during the lining process.

 

 

The weakest link in the entire trolley is the lower template and the lower die supporting diagonal rod. Therefore, when designing the lower template, the force of the lower die should be fully calculated, and the width and thickness of the arc plate should be widened as much as possible. The supporting diagonal rod must pass The stable calculation of the pressure rod ensures that the inclined rod has sufficient rigidity and strength, so that it will not deform and bend during use and cause mold running. In the calculation process, the influence of concrete lining thickness, slump, pouring speed, aggregate size and whether it is reinforced concrete should be fully considered. The screw jack at the top of the arch foot of the lower mold is the main force-bearing part. When the entire template is below the center line of the lining circle, it is completely supported by it. Therefore, its structure and rigidity should be considered in the design. In use, the jack must be firmly pressed against the ground, and no looseness is allowed. If necessary, it can be reinforced with other parts as an auxiliary support to prevent the mold from running and the trolley from shifting downward. It should be noted that, as the longitudinal positioning of the trolley, the rail clamp and the foundation screw jack must be tightened, clamped and secured to the rail, especially when lining the ramp.

 

This type of lining trolley is mainly used for the construction of large-span tunnels and underground caverns. If the traditional full hydraulic lining trolley is adopted, the design of the mast is difficult to meet the requirements of use, and the mast is deformed and damaged. First of all, the mast beam is twisted and deformed, which eventually leads to mold running. If the beam is heightened, the vertical beam, the lower longitudinal beam, and the oblique support section of the end face are enlarged, unnecessary waste will be caused. However, the use of a grid-type lining trolley can overcome the above difficulties. Since this type of lining trolley is for large-span construction, its operability should be considered when designing, and its working ladder and working walkway should be able to easily reach every working position.

 

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