JP7615359B2 - Prefabricated track structure and construction method for rail transit built-in pump room section - Google Patents

Description

The present invention relates to the technical field of rail transit, and in particular to a prefabricated track structure and construction method for a section of rail transit with an integrated pump room.

Currently, the pump room sections of rail transit systems mainly use cast-in-place concrete trackbeds, which results in poor construction quality, high labor costs, slow construction speed, and poor retention accuracy of the water passage pipes. As a result, water puddles frequently occur, the trackbed generally has low durability, is prone to chipping, cracks, and voids, and requires a very large amount of maintenance and repair work after operation.

Therefore, in view of the above deficiencies, the designers of the present invention have conducted extensive research and design, and by combining their many years of experience and achievements in the related industry, have researched and designed a prefabricated track structure and construction method for a pump room section built into a rail transit system, thereby overcoming the above deficiencies.

The present invention aims to provide a prefabricated track structure and construction method for a pump room section built into rail transit that can effectively solve the conventional technical problems of conventional cast-in-place track structures for built-in pump room sections, which have problems such as low construction quality, high labor costs, and slow construction speed, as well as low retention accuracy of water passage pipes, resulting in frequent occurrence of water puddles, generally low durability of the trackbed, prone to defects such as chipping, cracks, and voids, and a very large amount of maintenance and repair work after operation.

In order to achieve the above object, the present invention provides a prefabricated track structure for a pump room section with built-in rail traffic, which includes a rail, a fastener, a prefabricated I-shaped track slab, and a filling adjustment layer from top to bottom, the rail is fixed to the upper surface of the prefabricated I-shaped track slab by fasteners on both sides, and a filling adjustment layer is provided below the prefabricated I-shaped track slab,
The prefabricated I-shaped track slab includes a rail support and a prefabricated slab which are integrally formed, the plane of the prefabricated I-shaped track slab is an I-shaped structure, the middle is connected by a beam, and both ends of the middle beam are U-shaped openings, thereby forming a U-shaped water collection pit in the middle, the cross section of the prefabricated I-shaped track slab is polygonal, the lower surfaces on both sides are provided with a slope structure to enhance adaptability to the tunnel cross section, and a filling adjustment layer is injected between the bottom of the prefabricated I-shaped track slab and the shield segment.

A lifting casing is provided on each side of the prefabricated I-shaped track slab.

A drain cover plate is provided on the top surface of the U-shaped opening in the prefabricated I-shaped track slab for patrol personnel to walk on or for personnel to evacuate in an emergency.

Sealing waterproof material is provided at both the joints between the prefabricated I-shaped track slab and the filling adjustment layer, and at the joints between the filling adjustment layer and the shield segment.

Water passage pipes are pre-embedded in the bottom of the filling adjustment layer under the intermediate beam of the prefabricated I-shaped track slab to interconnect each U-shaped water collection pit.

Reinforcing bars are retained or embedded in the bottom of the prefabricated I-shaped track slab.

The filling adjustment layer is made of steel fiber reinforced crushed sand concrete, self-compacting concrete, or special mortar.

The water passage pipe is circular or polygonal.

In the prefabricated I-shaped track slab prefabrication step 1, the track slab grinding, rebar binding, and concrete pouring for the prefabricated slab are completed in the factory, and the track slab is cured after the prefabrication is completed to form a high-precision prefabricated I-shaped track slab;
A transportation and hanging step 2 in which the prefabricated I-shaped track slab is transported to a rail laying work surface and roughly placed;
Step 3: Fine-tuning the prefabricated I-shaped track slab;
A prefabricated I-shaped track slab positioning and fixing step 4, in which the prefabricated I-shaped track slab finely adjusted to a predetermined position is supported and fixed by shoring;
Step 5 of pre-embedding rebar binding and water passage pipes;
Step 6: installing formwork around the self-contained pump pit at the bottom of the track slab;
Step 7 of pouring concrete into the filling adjustment layer and maintaining it;
A fastener installation step 8;
Rail installation step 9;
A construction method for a prefabricated track structure for a pump room section with built-in rail transit is further disclosed, which includes an ancillary construction step 10.

As can be seen from the above, the prefabricated track structure and construction method for a pump room section of a rail transit system of the present invention have the following advantages:

1. The proposed prefabricated "I"-shaped track slab and construction method for the trackbed-embedded pump room section will significantly reduce the amount of rebar binding and concrete pouring required.

2. It has the characteristics of a simple construction process, low work burden, high construction accuracy, high construction efficiency, and excellent durability, and solves various defects and problems of on-site built-in pump room track structures.

3. It can effectively replace the conventional cast-in-place built-in pump room trackbed, and is in line with the current trend of rail transit toward environmental friendliness, high efficiency and reduced disruption, bringing great social benefits.

Details of the invention can be found in the following description and drawings.

FIG. 1 shows a front view of a prefabricated track structure for a section of a rail transit system with a built-in pump room according to the present invention. FIG. 2 shows a top view of the present invention.

Referring to Figures 1 and 2, the prefabricated track structure for a pump room section of a rail transit system of the present invention is shown.

The prefabricated track structure for the pump room section with built-in rail transit includes, from top to bottom, a rail 1, fasteners 2, a prefabricated I-shaped track slab 3, and a filling adjustment layer 7. The rail 1 is fixed to the upper surface of the prefabricated I-shaped track slab 3 by fasteners 2 on both sides, and a filling adjustment layer 7 is provided below the prefabricated I-shaped track slab 3. The prefabricated I-shaped track slab 3 includes a rail support and a prefabricated slab that are integrally molded. The plane of the prefabricated I-shaped track slab 3 is an I-shaped structure (see the plan view of Figure 2), the middle is connected by a beam, and both ends of the middle beam are U-shaped openings, thereby forming a U-shaped water collection pit 8 in the middle. The cross section of the prefabricated I-shaped track slab 3 is polygonal, and the lower surfaces on both sides are provided with a slope structure to enhance adaptability to the tunnel cross section.

The prefabricated I-shaped track slabs 3 are connected by beams and have an external shape similar to an I-shape, and the filling adjustment layer 7 is cast only at the bottom of the I-shaped structure and not within the range of the U-shaped openings at both ends of the beams, allowing equipment such as water pumps to be installed within the range of the U-shaped structure.

A filling adjustment layer 7 is injected between the bottom of the prefabricated I-shaped track slab 3 and the shield segment, and the filling adjustment layer 7 is made of steel fiber reinforced crushed sand concrete.

A lifting casing 5 is provided on each side of the prefabricated I-shaped track slab 3 to secure the prefabricated I-shaped track slab 3.

A drain cover plate 4 is provided on the top surface of the U-shaped opening of the prefabricated I-shaped track slab 3 for patrol personnel to walk through or for personnel to evacuate in an emergency.

A sealing waterproof material 6 is provided at both the joints between the prefabricated I-shaped track slab 3 and the filling adjustment layer 7, and at the joints between the filling adjustment layer 7 and the shield segment.

Water passage pipes 9 are pre-embedded in the bottom of the filling adjustment layer 7 under the intermediate beam of the prefabricated I-shaped track slab 3 to interconnect each U-shaped water collection pit 8.

Reinforcing bars can be retained or embedded in the shield segment area at the bottom of the prefabricated I-shaped track slab 3, improving connectivity between the track bed and the shield segment.

The filling adjustment layer may be made of materials with excellent fluidity, such as steel fiber reinforced crushed sand concrete, self-compacting concrete, and special mortar.

The side or top surface of the prefabricated I-shaped track slab 3 is provided with a lifting casing or other device for lifting or fixing the track slab.

The water passage tube may be circular or polygonal.

The construction method for the prefabricated track structure for the pump room section of the rail transit system of the present invention mainly includes the following steps:

Step 1: Prefabrication of the prefabricated I-shaped track slab 3. The track slab is ground with a grinding stone, rebar is tied, and the prefabricated slab concrete is poured in the factory. After the prefabrication is complete, the track slab is cured to form a high-precision prefabricated I-shaped track slab 3.

Step 2: Transportation and hoisting. The prefabricated I-shaped track slab 3 is transported to the construction site using a car, and then the prefabricated I-shaped track slab 3 is transported to the rail laying work surface using a slab transport vehicle. After being transported to the rail laying work surface, rough placement is performed.

Step 3: Fine-tuning the prefabricated I-shaped track slab 3. A small gantry crane is used to fine-tune the prefabricated I-shaped track slab 3.

Step 4: Positioning and fixing the prefabricated I-shaped track slabs 3. The prefabricated I-shaped track slabs 3 that have been finely adjusted to their designated positions are supported and fixed with shoring. Each prefabricated I-shaped track slab 3 has four or more support points installed as necessary.

Step 5: Binding of rebars and pre-embedding of water passage pipes 9. After the binding of rebars is completed, the water passage pipes are pre-embedded in the beams of the prefabricated I-shaped track slab 3.

Step 6: Install formwork around the built-in pump pit at the bottom of the track slab. After the prefabricated I-shaped track slab 3 is fixed, the pump pit formwork for the built-in pump room section is installed.

Step 7: Pouring concrete for the filling adjustment layer 7 and maintaining it. After removing the water that has accumulated at the bottom of the slab, the filling adjustment layer 7 is poured, and when the strength of the filling adjustment layer 7 reaches a specified strength, the support device for the prefabricated slab that was erected in step 4 is removed.

Step 8: Installing the fasteners. Once the filling adjustment layer 7 has reached a predetermined strength, the upper fasteners are installed in the following order: lower elastic backing plate of the iron backing plate → iron backing plate → elastic backing plate under the rail.

Step 9: Installing the rails. A tracked transport vehicle is used to transport the rails to the work surface, which then unloads and distributes the rails to the mounting points. The rails are then moved into the rail receiving grooves of the fastener's steel backing plate, and the fastener components, such as gauge blocks, connecting bolts, and clips, are installed.

Step 10: Ancillary construction. After construction of the main structure is completed, waterproofing material is applied inside the pump pit and a drain cover plate is installed on the top.

As can be seen, this invention is applicable to the field of rail transit, replacing the traditional cast-in-place built-in pump room trackbed, and has the characteristics of a simple construction process, fast construction speed, high construction accuracy, low work burden, high aesthetics, and excellent durability, etc., which is in line with the current trend of rail transit toward environmental friendliness, high efficiency, and reduced interference, and brings great social benefits.

As should be clear, the above description and explanations are illustrative and are not intended to limit the disclosure, application, or uses of the present invention. Although the embodiments shown in the drawings have been described, the present invention is not limited to the specific best conventional embodiment for carrying out the invention described in the examples and embodiments shown in the drawings, and the scope of the present invention includes all embodiments falling within the scope of the above specification and the appended claims.

Claims (6)

A method for constructing a prefabricated track structure for a section of a pump room built into a rail transit system, comprising the steps of:
Prefabricated I-shaped track slab prefabrication step 1, in which rebar binding and concrete pouring for the prefabricated slab are completed in the factory, and the track slab is cured after prefabrication is completed to form a high-precision prefabricated I-shaped track slab;
A transportation and hanging step 2 in which the prefabricated I-shaped track slab is transported to a rail laying work surface and roughly placed;
Step 3: Fine-tuning the prefabricated I-shaped track slab;
A step 4 of positioning and fixing the prefabricated I-shaped track slabs, which are finely adjusted to a predetermined position, is performed by using supports to support and fix the prefabricated I-shaped track slabs, in which four or more support points are provided on each prefabricated I-shaped track slab;
After the rebar bundling is completed, a rebar bundling and water passage pipe pre-embedding step 5 is performed in which the water passage pipe is pre-embedded in the beam of the prefabricated I-shaped track slab;
Step 6: installing formwork around the self-contained pump pit at the bottom of the track slab;
After removing the water that has accumulated at the bottom of the slab, a filling adjustment layer is poured. When the strength of the filling adjustment layer reaches a predetermined strength, a concrete injection and maintenance step 7 of the filling adjustment layer is performed to remove the support points of the prefabricated slab erected in step 4;
The installation sequence is the elastic backing plate under the iron backing plate → the iron backing plate → the elastic backing plate under the rail, which is the fastener installation step 8.
a rail installation step 9 of transporting the rails to a work surface using a track transport vehicle, lowering and distributing the rails to the attachment points by the transport vehicle, moving the rails into the rail receiving grooves of the steel backing plate of the fastener, and installing fastener members such as gauge blocks, connection bolts, and clips;
A construction method for a prefabricated track structure for a rail transit built-in pump room section, comprising:
The specific structure includes, from top to bottom, a rail, fasteners, a prefabricated I-shaped track slab, and a filling adjustment layer, the rail is fixed to the upper surface of the prefabricated I-shaped track slab by fasteners on both sides, and a filling adjustment layer is provided below the prefabricated I-shaped track slab.
The prefabricated I-shaped track slab includes a rail support and a prefabricated slab that are integrally formed; the plane of the prefabricated I-shaped track slab is an I-shaped structure, the middle is connected by a beam, and both ends of the middle beam are U-shaped openings, thereby forming a U-shaped water collection pit in the middle; the cross section of the prefabricated I-shaped track slab is polygonal, and the lower surfaces on both sides are provided with a slope structure to enhance adaptability to the tunnel cross section; and a filling adjustment layer is injected between the bottom of the prefabricated I-shaped track slab and the shield segment;
The filling adjustment layer is cast only under the I-shaped structure, and is not cast within the range of the U-shaped openings at both ends of the beam, so that equipment can be installed within the range of the U-shaped structure;
A prefabricated track structure construction method for a pump room section built into rail traffic, characterized in that a water passage pipe for connecting each U-shaped water collection pit to each other is embedded in the bottom of the filling adjustment layer under the intermediate beam of the prefabricated I-shaped track slab in advance, and the filling adjustment layer is made of steel fiber reinforced crushed sand concrete or self-compacting concrete. The method for constructing a prefabricated track structure for a pump room section with built-in rail transit, as described in claim 1, characterized in that a lifting casing is provided on each side of the prefabricated I-shaped track slab. The method for constructing a prefabricated track structure for a pump room section with built-in rail transit system, as described in claim 1, characterized in that a drainage cover plate is provided on the top surface of the U-shaped opening of the prefabricated I-shaped track slab for patrol personnel to walk on or for personnel to evacuate in an emergency. The construction method for a prefabricated track structure for a pump room section with built-in rail transit system, as described in claim 1, characterized in that a sealing waterproof material is provided at both the joint between the prefabricated I-shaped track slab and the filling adjustment layer, and at the joint between the filling adjustment layer and the shield segment. The construction method for a prefabricated track structure for a pump room section with built-in rail transit, as described in claim 1, characterized in that reinforcing bars are retained or embedded in the bottom of the prefabricated I-shaped track slab. The method for constructing a prefabricated track structure for a pump room section with built-in track transportation, as described in claim 1, characterized in that the water passage pipe is circular or polygonal.

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