Tunnel section evacuation platform loosening displacement integrated reinforcing device and construction method

Abstract

The invention discloses a tunnel section evacuation platform loosening displacement integrated reinforcing device and a construction method, and belongs to the technical field of tunnel safety engineering.The tunnel section evacuation platform loosening displacement integrated reinforcing device comprises supporting angle steel located at the lower end of an evacuation platform; the supporting angle steel is installed on the side portion of the bracket support, one side of the supporting angle steel is fixedly connected with the evacuation platform, and the other side of the supporting angle steel is fixedly connected with the side portion of the bracket support. The movement limiting steel plate is arranged on the side, close to the center of the tunnel, of the evacuation platform and fixedly connected with the end, close to the side of the center of the tunnel, of the supporting angle steel so as to prevent the platform plate of the evacuation platform from transversely moving outwards. The method effectively solves the problem of loosening and displacement of the tunnel section evacuation platform caused by vibration of a train and wind load in the subway operation process, achieves breakthrough progress compared with a construction method, has the advantages of being high in load performance, convenient to install, high in reliability and the like, and can be implemented and popularized in the later construction process.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel safety engineering, and in particular relates to a loose displacement integrated reinforcement device for a tunnel interval evacuation platform and a construction method. Background Art

[0002] With the development of cities, the flow of people is gradually increasing. In order to meet people's travel needs, urban rail transit facilities are expanding rapidly, especially subways, which play a pivotal role in the development of cities. In the operation of subways, for safety reasons, in the event of a fire or parking accident in the tunnel section, a safe evacuation platform for passengers to escape is required. Passengers can escape from the dangerous place where the accident occurred through the safe evacuation platform.

[0003] The evacuation platform is mainly composed of platform plates and corbel brackets. Traditional evacuation platform plates are mostly directly laid on the corbel brackets, lacking effective fixation. The vibration of trains and wind loads during subway operation will cause the evacuation platform plates to loosen and move.

[0004] In response to the loose displacement problem of the tunnel section evacuation platform, the existing construction technologies are mainly divided into two types: platform plate cutting and replacement and platform plate temporary reinforcement. The advantages and disadvantages are as follows:

[0005] 1. Platform board cutting and replacement

[0006] In order to solve the problems of insufficient longitudinal overlap length and lateral outward displacement of the evacuation platform panels, a platform panel cutting and replacement plan is adopted to restore the overlap length of the platform panels, thereby solving the problem of loose displacement of the platform panels.

[0007] Advantages: It solves the problem of loose displacement of platform board from the root.

[0008] Disadvantages: The cost of replacing the platform board is high, and cutting and moving are time-consuming and laborious.

[0009] 2. Temporary reinforcement of platform slab joints

[0010] Cement mortar is used to fill the joints around three sides of the evacuation platform board to achieve temporary reinforcement.

[0011] Advantages: easy construction.

[0012] Disadvantages: With the vibration and wind load caused during the operation of the subway, the cement mortar used to fill the joints will loosen and fall off, and the platform slab will continue to loosen and move, failing to solve the problem at its root.

[0013] Therefore, a reinforcement technology and device for the evacuation platform of the operating line is needed to effectively solve the problem of loose displacement of the evacuation platform in the tunnel section. Summary of the invention

[0014] In order to provide a method that can effectively solve the loose displacement problem of the tunnel interval evacuation platform, the present invention adopts the following technical solutions:

[0015] A loose displacement integrated reinforcement device for a tunnel interval evacuation platform, comprising:

[0016] A support angle steel, the support angle steel being located at the lower end of the evacuation platform; the support angle steel being installed on the side of the corbel bracket, wherein one side of the support angle steel is fixedly connected to the evacuation platform, and the other side is fixedly connected to the side of the corbel bracket; an end of the support angle steel close to the center of the tunnel is aligned with an end of the evacuation platform close to the center of the tunnel;

[0017] The movement limiting steel plate is arranged on the side of the evacuation platform close to the center of the tunnel and is fixedly connected to the end of the supporting angle steel close to the center of the tunnel to prevent the platform plate of the evacuation platform from moving laterally outward.

[0018] Furthermore, the supporting angle steel is an angle steel of L60×60×5mm, and the surface is treated by a hot-dip galvanizing surface treatment process.

[0019] Furthermore, the extension direction of the supporting angle steel is consistent with the extension direction of the evacuation platform toward the center of the tunnel.

[0020] Furthermore, the support angle steel and the evacuation platform, and the support angle steel and the side of the corbel bracket are fixedly connected by a plurality of self-tapping anchor bolts.

[0021] Furthermore, the self-tapping anchor bolt is an M8 self-tapping anchor bolt.

[0022] Furthermore, the displacement limiting steel plate is welded to an end portion of the supporting angle steel close to the center of the tunnel.

[0023] Furthermore, the displacement limiting steel plate is a 5mm steel plate, and the surface is treated by a hot-dip galvanizing surface treatment process.

[0024] A method for constructing a loose and displaced integrated reinforcement device for a tunnel interval evacuation platform, which is a construction method for constructing a loose and displaced integrated reinforcement device for a tunnel interval evacuation platform as described in any one of the above items, and the construction method comprises the following steps:

[0025] S10, structural surface cleaning

[0026] Simply clean the surface of the evacuation platform and the bracket structure to ensure that the surface is clean and flat;

[0027] S20, positioning drilling

[0028] The installation height should be positioned according to the on-site conditions. Use a marker to make drilling marks first to ensure that the angle steel flange elevation is flush with the bottom of the platform plate. Use a hand drill to drill holes on the bottom of the platform plate and the side of the corbel bracket. Clean the holes after drilling.

[0029] S30, contact surface filling and leveling

[0030] Before installing the integrated platform reinforcement connection device, the integrity of the evacuation platform and the bracket should be confirmed;

[0031] S40, installation of integrated platform plate reinforcement connection device

[0032] The integrated platform plate reinforcement connection device is composed of L60×60×5mm angle steel and 5mm steel plate welded together. After the steel plate and angle steel are sandblasted and rust-removed, they are hot-dip galvanized as a whole, and the galvanizing thickness is not less than 85μm;

[0033] S50, anchor reinforcement

[0034] The integrated platform reinforcement connector is connected and fixed with the side of the corbel bracket and the bottom of the platform plate by self-drilling anchor bolts; the anchor bolt spacing can be adjusted flexibly; the depth of the anchor bolt anchored into the corbel bracket shall not be less than 45mm, and the depth of the anchor bolt anchored into the evacuation platform panel shall not be less than 35mm;

[0035] S60, platform board joint treatment

[0036] Cement mortar is used to fill and grout the joints around three sides of the platform slab of the reinforced evacuation platform.

[0037] Beneficial effects:

[0038] The present invention effectively solves the loose displacement problem of the tunnel section evacuation platform caused by the vibration of the train and wind load during the operation of the subway, and has made a breakthrough compared with the construction method. It has the characteristics of strong load performance, easy installation, high reliability, etc., and can be implemented and promoted in future construction processes.

[0039] At the same time, the application of the loose displacement integrated reinforcement construction method of the tunnel interval evacuation platform provided by the present invention meets the use requirements after on-site comparison and analysis, improves the construction efficiency and saves engineering costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a loose displacement integrated reinforcement device for a tunnel interval evacuation platform provided by the present invention;

[0041] Figure 2 A schematic diagram of the installation position of the loose displacement integrated reinforcement device for the tunnel interval evacuation platform provided by the present invention;

[0042] Among them: 1. Support angle steel; 2. Limit movement steel plate; 3. Self-tapping anchor bolt; 4. Evacuation platform; 5. Corbel bracket. DETAILED DESCRIPTION

[0043] Example 1

[0044] refer to Figure 1-2 , a tunnel interval evacuation platform loose displacement integrated reinforcement device, comprising:

[0045] A support angle steel 1, which is located at the lower end of the evacuation platform 4; the support angle steel 1 is installed on the side of the corbel bracket 5, wherein one side of the support angle steel 1 is fixedly connected to the evacuation platform 4, and the other side is fixedly connected to the side of the corbel bracket 5; an end of the support angle steel 1 close to the center of the tunnel is aligned with an end of the evacuation platform 4 close to the center of the tunnel;

[0046] The movement limiting steel plate 2 is arranged on the side of the evacuation platform 4 close to the tunnel center and is fixedly connected to the end of the supporting angle steel 1 close to the tunnel center to prevent the platform plate of the evacuation platform 4 from moving outward laterally.

[0047] In this embodiment, the supporting angle steel 1 is an angle steel of L60×60×5 mm, and its surface is treated by hot-dip galvanizing.

[0048] In this embodiment, the extending direction of the supporting angle steel 1 is consistent with the extending direction of the evacuation platform 4 toward the center of the tunnel.

[0049] In this embodiment, the supporting angle steel 1 and the evacuation platform 4 , as well as the supporting angle steel 1 and the side of the corbel bracket 5 are fixedly connected by a plurality of self-tapping anchor bolts 3 .

[0050] Specifically, the self-drilling anchor bolt 3 is an M8 self-drilling anchor bolt 3 .

[0051] In this embodiment, the movement limiting steel plate 2 is welded to an end of the supporting angle steel 1 close to the center of the tunnel.

[0052] Specifically, the displacement limiting steel plate 2 is a 5 mm steel plate, and the surface is treated by a hot-dip galvanizing surface treatment process.

[0053] The integrated reinforcement device for loose displacement of a tunnel interval evacuation platform provided by the present invention solves the problem of loose displacement of the tunnel interval evacuation platform caused by the vibration of trains and wind loads during subway operation, and has the characteristics of strong load performance, easy installation, high reliability, etc.

[0054] Example 2

[0055] A method for constructing a loose and displaced integrated reinforcement device for a tunnel interval evacuation platform is provided in Example 1. The method comprises the following steps:

[0056] S10, structural surface cleaning

[0057] Simply clean the surface of the evacuation platform 4 and the bracket support 5 to ensure that the surface is clean and flat;

[0058] S20, positioning drilling

[0059] The installation height should be positioned according to the on-site conditions. Use a marker to make drilling marks first to ensure that the angle steel flange elevation is flush with the bottom of the platform plate. Use a hand drill to drill holes on the bottom of the platform plate and the side of the corbel bracket 5. Clean the holes after drilling.

[0060] S30, contact surface filling and leveling

[0061] Before installing the integrated platform plate reinforcement connection device, the integrity of the evacuation platform 4 plate and the corbel bracket 5 should be confirmed; if damage or other conditions that affect the safety of use are found, they should be reinforced, and serious damage should be replaced; if the gap in the local contact part is found to be large, measures such as filling with mortar, using wedge blocks or adjusting the flatness of the platform plate should be taken to ensure effective connection of the contact surface;

[0062] S40, installation of integrated platform plate reinforcement connection device

[0063] The integrated platform plate reinforcement connection device is composed of L60×60×5 (mm) angle steel welded with 5mm steel plate. After the steel plate and angle steel are sandblasted and derusted (rust removal grade Sa3), the whole is hot-dip galvanized, and the galvanizing thickness is not less than 85μm;

[0064] S50, anchor reinforcement

[0065] The integrated platform reinforcement connector adopts self-drilling anchor bolts 3 to connect and fix with the side of the corbel bracket 5 and the bottom of the platform plate; the spacing between anchor bolts can be adjusted appropriately and flexibly; the depth of anchor bolts anchored into the corbel bracket 5 shall not be less than 45mm, and the depth of anchor bolts anchored into the panel of the evacuation platform 4 shall not be less than 35mm;

[0066] Specifically, four M8 self-tapping anchor bolts 3 are used to connect and fix the side of the corbel bracket 5 and the bottom of the platform plate, and the anchor bolt grade is 5.6; the anchor bolt spacing is controlled at 8 cm, a total of three anchor bolts are shot, and four holes are reserved for the angle steel, which can be flexibly adjusted appropriately during the specific implementation process.

[0067] S60, platform board joint treatment

[0068] The platform slab of the evacuation platform 4 that has been reinforced is filled with cement mortar around three sides for grouting.

[0069] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A loose displacement integrated reinforcement device for a tunnel interval evacuation platform, characterized in that: include: A support angle steel, the support angle steel being located at the lower end of the evacuation platform; the support angle steel being installed on the side of the corbel bracket, wherein one side of the support angle steel is fixedly connected to the evacuation platform, and the other side is fixedly connected to the side of the corbel bracket; an end of the support angle steel close to the center of the tunnel is aligned with an end of the evacuation platform close to the center of the tunnel; The movement limiting steel plate is arranged on the side of the evacuation platform close to the center of the tunnel and is fixedly connected to the end of the supporting angle steel close to the center of the tunnel to prevent the platform plate of the evacuation platform from moving laterally outward.

2. The loose displacement integrated reinforcement device for the tunnel interval evacuation platform according to claim 1 is characterized in that: The supporting angle steel is an angle steel of L60×60×5mm, and the surface is treated by hot-dip galvanizing.

3. The loose displacement integrated reinforcement device for tunnel interval evacuation platform according to claim 1 is characterized in that: The extending direction of the supporting angle steel is consistent with the extending direction of the evacuation platform toward the tunnel center.

4. The loose displacement integrated reinforcement device for tunnel interval evacuation platform according to claim 3 is characterized in that: The supporting angle steel and the evacuation platform, as well as the supporting angle steel and the side of the corbel bracket are fixedly connected by a plurality of self-tapping anchor bolts.

5. The loose displacement integrated reinforcement device for tunnel interval evacuation platform according to claim 4 is characterized in that: The self-tapping anchor bolt is an M8 self-tapping anchor bolt.

6. The loose displacement integrated reinforcement device for tunnel interval evacuation platform according to claim 1 is characterized in that: The displacement limiting steel plate is welded to an end of the supporting angle steel close to the tunnel center.

7. The loose displacement integrated reinforcement device for tunnel interval evacuation platform according to claim 1 is characterized in that: The displacement limiting steel plate is a 5mm steel plate, and the surface is treated by a hot-dip galvanizing surface treatment process.

8. A method for strengthening the loose displacement of a tunnel evacuation platform, characterized in that: The construction method of the loose displacement integrated reinforcement device for the tunnel interval evacuation platform according to any one of claims 1 to 7 comprises the following steps: S10, structural surface cleaning Simply clean the surface of the evacuation platform and the bracket structure to ensure that the surface is clean and flat; S20, positioning drilling The installation height should be positioned according to the on-site conditions. Use a marker to make drilling marks first to ensure that the angle steel flange elevation is flush with the bottom of the platform plate. Use a hand drill to drill holes on the bottom of the platform plate and the side of the corbel bracket. Clean the holes after drilling. S30, contact surface filling and leveling Before installing the integrated platform reinforcement connection device, the integrity of the evacuation platform and the bracket should be confirmed; S40, installation of integrated platform plate reinforcement connection device The integrated platform plate reinforcement connection device is composed of L60×60×5mm angle steel and 5mm steel plate welded together. After the steel plate and angle steel are sandblasted and rust-removed, they are hot-dip galvanized as a whole, and the galvanizing thickness is not less than 85μm; S50, anchor reinforcement The integrated platform reinforcement connector is connected and fixed with the side of the corbel bracket and the bottom of the platform plate by self-drilling anchor bolts; the anchor bolt spacing can be adjusted flexibly; the depth of the anchor bolt anchored into the corbel bracket shall not be less than 45mm, and the depth of the anchor bolt anchored into the evacuation platform panel shall not be less than 35mm; S60, platform board joint treatment Cement mortar is used to fill and grout the joints around the three sides of the reinforced evacuation platform.

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