Protective net of railway tunnel portal lateral opening buffer structure

Abstract

The utility model discloses a protective net of a lateral opening buffer structure of a railway tunnel portal, which comprises two protective nets, the opening end of a tunnel opening section is provided with a horn mouth inverted cutting section, two sides of the opening section are respectively provided with dynamic openings, and the two protective nets are respectively connected in the two dynamic openings; the protective net comprises an angle steel frame, a plurality of longitudinal steel bars and a plurality of vertical steel bars, and the longitudinal steel bars and the vertical steel bars are connected to the inner side of the angle steel frame. The protective net further comprises a piece of vertical angle steel and three pieces of longitudinal angle steel. The three pieces of longitudinal angle steel are arranged on the inner side of the angle steel frame at equal intervals, and the vertical angle steel is vertically arranged on the inner side of the angle steel frame. The utility model aims to overcome the defects in the prior art, and provides the protective net for the lateral opening buffer structure of the railway tunnel portal, so that the operation safety of a tunnel is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of protective nets of railway tunnel portal lateral opening buffer structure. BACKGROUND

[0002] On high-speed railway, when high-speed train suddenly enters tunnel with limited clearance from open space, air in front of train is compressed to generate microbar, which is called "aerodynamic effect".

[0003] In order to alleviate the degree of sudden change of train operation space condition, reduce the effect of microbar, and improve passenger comfort, the existing buffer structure with larger clearance area than effective area of tunnel clearance (i.e. clearance area above rail top surface in lining inner contour) is set at portal.

[0004] Generally, the opening position of the buffer structure is set at vault, but when there are dangerous rockfall above the vertical slope of portal, it will bring safety hazard to tunnel operation with vault opening; small animals, sundries and floating objects may enter tunnel from opening structure, so a protective net of railway tunnel portal lateral opening buffer structure is proposed to solve the above problems. UTILITY MODEL CONTENT

[0005] The utility model aims to overcome the defects of the prior art and provide a protective net of railway tunnel portal lateral opening buffer structure, which ensures the operation safety of tunnel.

[0006] To achieve the above object, the utility model provides the following technical scheme: a protective net of railway tunnel portal lateral opening buffer structure, comprising two protective nets, a trumpet mouth inverted section is arranged at the opening end of tunnel opening section, two dynamic openings are arranged at both sides of the opening section, and two protective nets are connected in two dynamic openings respectively.

[0007] The protective net comprises an angle steel frame, a plurality of longitudinal steel bars and a plurality of vertical steel bars, and the plurality of longitudinal steel bars and the plurality of vertical steel bars are connected inside the angle steel frame.

[0008] Preferably, the protective net further comprises one vertical angle steel and three longitudinal angle steels; the three longitudinal angle steels are equidistantly arranged inside the angle steel frame, and the vertical angle steel is vertically arranged inside the angle steel frame.

[0009] Preferably, a plurality of connecting steel plates are connected to the outside of the angle steel frame, embedded bolts are arranged around the inner wall of the dynamic opening, and the connecting steel plates are connected with the embedded bolts.

[0010] Preferably, a secondary lining structure of tunnel is arranged from the tunnel opening section to the inside of tunnel.

[0011] Preferably, a deformation joint is arranged between the secondary lining structure of the tunnel and the tunnel opening section.

[0012] Preferably, the dynamic opening is a square hole.

[0013] Compared with the prior art, the protective net of the railway tunnel opening lateral opening buffer structure has the advantages that: the dynamic openings are arranged on the two sides of the tunnel opening section, and the protective net is connected in the dynamic openings; the protective net can block foreign matters from entering the tunnel, thereby ensuring the operation safety of the tunnel; and the protective net has simple structure, convenient construction and strong adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the technical scheme of the present application, and do not constitute a limitation on the present application. In the drawings:

[0015] Fig. 1 Fig. 1 is an installation position schematic view of the protective net of the railway tunnel opening lateral opening buffer structure of the present application;

[0016] Fig. 2 Fig. 2 is a schematic view of the protective net of the present application;

[0017] Fig. 3 Fig. 3 is a connection detail view of the protective net of the present application.

[0018] In the drawings: 1, trumpet mouth inverted cut section; 2, opening section; 3, dynamic opening; 4, secondary lining structure of the tunnel; 5, deformation joint; 6, protective net; 6-1, angle steel frame; 6-2, longitudinal steel bar; 6-3, vertical steel bar; 6-4, connecting steel plate; 6-5, pre-buried bolt; 6-6, vertical angle steel; 6-7, longitudinal angle steel. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] Please refer to Figs. 1-3A protective net of a railway tunnel opening lateral opening buffer structure, comprising two protective nets 6, a trumpet mouth inverted section 1 is arranged at an opening end of a tunnel opening section 2, two dynamic openings 3 are respectively arranged at two sides of the opening section 2, and the two protective nets 6 are respectively connected in the two dynamic openings 3; the dynamic opening 3 is a square hole. The trumpet mouth inverted section 1 and the opening section 2 are integrally poured, and C35 reinforced concrete is adopted. The dynamic opening 3 is 4 m in height, 4 m in length, 2.3 m in bottom edge distance from a groove top surface, and 1 m in outer edge distance from a boundary line of the trumpet mouth inverted section and the opening section.

[0021] Specifically, the exposed part of the open-cut construction section of the buffer structure is brushed with penetration crystalline waterproof paint, and EVA waterproof boards are laid on the arch wall of the filled part. A 10-20 mm M10 cement mortar leveling layer is applied inside the waterproof board, and a 100 mm thick fine stone concrete protective layer is applied outside the waterproof board before backfilling.

[0022] Specifically, the protective net 6 comprises an angle steel frame 6-1, a plurality of longitudinal steel bars 6-2 and a plurality of vertical steel bars 6-3, the plurality of longitudinal steel bars 6-2 and the plurality of vertical steel bars 6-3 are connected to the inner side of the angle steel frame 6-1. The protective net 6 further comprises a vertical angle steel 6-6 and three longitudinal angle steels 6-7; the three longitudinal angle steels 6-7 are equidistantly arranged on the inner side of the angle steel frame 6-1, and the vertical angle steel 6-6 is vertically arranged on the inner side of the angle steel frame 6-1. A plurality of connecting steel plates 6-4 are connected to the outer side of the angle steel frame 6-1, and embedded bolts 6-5 are arranged around the inner wall of the dynamic opening 3, and the connecting steel plates 6-4 are connected with the embedded bolts 6-5.

[0023] Specifically, the protective net 6 is a 25 mm (10x10 cm) diameter steel protective net, and the protective net is fixed around the concrete opening structure by angle steels, bolts and the like for convenient maintenance.

[0024] Specifically, the angle steel frame 6-1 is a No. 10 angle steel (L100x100x10). The longitudinal angle steels 6-7 are No. 5 angle steels (L50x50x5), and three are equidistantly arranged; the vertical angle steel 6-6 is a No. 5 angle steel (L50x50x5), and one is arranged at the middle position.

[0025] Specifically, the longitudinal steel bars 6-2 and the vertical steel bars 6-3 are both 25 mm diameter steel bars, and the spacing is 100 mm. The length is determined according to the size of the opening structure, and each node is resistance welded. The longitudinal steel bars and the vertical steel bars are welded with the angle steel frame 6-1, and the welding length is not less than 50 mm, and double-sided welding is adopted.

[0026] Specifically, the embedded bolts 6-5 are embedded with two M24 bolts at an interval of 1 m around the opening structure, with a buried depth of 200 mm and an exposed length of 40 mm, and a connecting steel plate 6-4 is added, which is 180x120x5 mm in size.

[0027] Specifically, the protective net 6 is produced in a factory and is galvanized in the factory; the metal products such as the reinforcing steel bars, the steel plates, the angle steels, the bolt ends and the nuts must be hot galvanized, the hot galvanizing should meet the provisions of JT / T281, and the average thickness of the galvanized layer should not be less than 0.061mm. After the protective net is processed, it is welded with the connecting steel plate 6-4 on site, and the height of the weld is not less than 5mm.

[0028] Specifically, after the construction is completed, the bolt head and the nut are coated with epoxy zinc-rich anti-rust paint, the anti-rust paint contains not less than 65% of zinc, the dry film thickness of the anti-rust paint is not less than 250um, the toning epoxy enamel is the topcoat, and the dry film thickness of the toning epoxy enamel is not less than 150um; attention should be paid to the protection of the galvanized metal products during the construction, and the galvanized layer should not be damaged.

[0029] Specifically, the tunnel secondary lining structure 4 is arranged between the tunnel opening section 2 and the inner side of the tunnel. The deformation joint 5 is arranged between the tunnel secondary lining structure 4 and the tunnel opening section 2. The distance between the deformation joints 5 is 2cm.

[0030] The protective net of the railway tunnel opening side hole buffering structure is characterized in that the dynamic hole 3 is arranged on each side of the tunnel opening section 2, and the protective net 6 is connected in the dynamic hole 3; the protective net 6 can block the foreign matters from entering the tunnel, and ensures the operation safety of the tunnel; and the protective net has simple structure, is convenient to construct and has strong adaptability.

[0031] Finally, it should be noted that: the above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, the technical scheme recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A protective screen for a railway tunnel portal lateral opening buffer structure, characterized in that, The utility model provides a tunnel opening section (2) and the tunnel inside are provided with tunnel secondary lining structure (4), the tunnel secondary lining structure (4) and the tunnel opening section (2) between setting deformation joint (5), the utility model discloses a tunnel opening section (2) including two protective nets (6), the opening end of the opening section (2) is provided with a trumpet mouth inverted section (1), both sides of the opening section (2) are provided with dynamic opening (3) respectively, two protective nets (6) are connected in two dynamic openings (3) respectively. The protective net (6) includes an angle steel frame (6-1), a plurality of longitudinal steel bars (6-2) and a plurality of vertical steel bars (6-3), and the plurality of longitudinal steel bars (6-2) and the plurality of vertical steel bars (6-3) are connected to the inner side of the angle steel frame (6-1).

2. The protective screen for railway tunnel portal lateral opening buffer structures according to claim 1, characterized in that, The protective net (6) further includes a vertical angle steel (6-6) and three longitudinal angle steels (6-7), the three longitudinal angle steels (6-7) are equidistantly arranged on the inner side of the angle steel frame (6-1), and the vertical angle steel (6-6) is vertically arranged on the inner side of the angle steel frame (6-1).

3. The protective screen for railway tunnel portal lateral opening buffer structures according to claim 1, characterized in that, The outer side of the angle steel frame (6-1) is connected to a plurality of connecting steel plates (6-4), the inner wall of the dynamic opening (3) is provided with embedded bolts (6-5) around, and the connecting steel plates (6-4) are connected to the embedded bolts (6-5).

4. The protective screen for railway tunnel portal lateral opening buffer structures according to claim 1, characterized in that, The tunnel opening section (2) to the tunnel inside is provided with a tunnel secondary lining structure (4).

5. The protective screen for railway tunnel portal lateral opening buffer structures according to claim 4, characterized in that, The tunnel secondary lining structure (4) and the tunnel opening section (2) are provided with a deformation joint (5) between them.

6. The protective screen for railway tunnel portal lateral opening buffer structures according to claim 4, characterized in that, The dynamic opening (3) is a square hole.

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