Tunnel ventilation device for tunnel crossing mid-partition method multi-pilot tunnel excavation

Abstract

The utility model provides a tunnel ventilation device for tunnel crossing mid-partition method multi-pilot tunnel excavation. The tunnel ventilation device comprises an air supply assembly, a pipeline assembly, an air distribution assembly and an air supply assembly. The air supply assembly comprises a draught fan used for guiding air quantity and replacing air, and the draught fan is installed in the tunnel shield well. The pipeline assembly comprises a first air supply pipeline used for conveying air. The first air supply pipeline is connected with the draught fan and the air distribution assembly so that air at the draught fan can be conveyed into the air distribution assembly. The air distribution assembly at least comprises an air distribution box used for distributing air to each pilot tunnel in the tunnel, and the air distribution box is placed in each pilot tunnel in the tunnel; every two adjacent air separation boxes in the height direction of the pilot tunnels are connected and connected in series to be matched with the first air supply pipeline to form a channel which communicates with the pilot tunnels and is used for conveying air. The air supply assembly at least comprises a second air supply pipeline used for conveying the air quantity of the air separation box into all pilot tunnels in the tunnel. One end of the second air supply pipeline is connected with an air distribution box, and the other end follows the excavation of the tunnel face.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel ventilation, in particular to a tunnel ventilation device used for tunnel crossing partition wall method multi-guide tunnel excavation. Background Art

[0002] When the mining section between Xiamen University Baicheng Station and Zengcuo'an Station of the southern extension project of Xiamen Metro Line 3 was excavated, because the tunnel was underground and long, the heat generated by the concrete heat dissipation was not ventilated in such a closed environment, which would lead to an increase in the construction environment temperature and serious safety accidents. As the tunnel was continuously excavated and continued to advance deeper into the mountain, the temperature and humidity in the tunnel increased accordingly, which also threatened the health of the construction workers at all times. In order to ensure the safety of the construction work, it is necessary to build a ventilation system at the construction site to ensure the feasibility of the construction and form a safe and good construction site.

[0003] However, the ventilation system method of the Zhongyuan Tunnel in the tunnel excavation has obvious shortcomings. In the original plan, the air supply system is transported by the tunnel vault, and the air volume flows from the vault to the four guide tunnel chambers. In the actual operation process, the air replacement volume in each guide tunnel is low and the effect is not good. This easily leads to poor air quality and high temperature in the tunnel, which is not conducive to the production operations of construction workers and it is difficult to ensure the safety of the construction site. Utility Model Content

[0004] The main technical problem to be solved by the utility model is to provide a tunnel ventilation device for excavating multiple guide holes by using a partition wall method in a tunnel intersection, so that the air in each guide hole in the tunnel can be fully replaced.

[0005] In order to solve the above technical problems, the utility model provides a tunnel ventilation device for excavating multiple guide tunnels by the partition wall method in a tunnel intersection, comprising: an air supply component, a pipeline component, an air distribution component and an air supply component; the air supply component comprises a fan for guiding air volume and replacing air, and the fan is installed in the tunnel shield shaft; the pipeline component comprises a first air supply pipeline for conveying air volume; the first air supply pipeline connects the fan and the air distribution component so that the air volume at the fan is conveyed into the air distribution component; the air distribution component comprises at least one air distribution box for diverting air volume to each guide tunnel in the tunnel, and the air distribution box is placed in each guide tunnel in the tunnel; two adjacent air distribution boxes along the height direction of the guide tunnel are connected, and are connected in series with the first air supply pipeline to form a channel connecting each guide tunnel for conveying air volume; the air supply component comprises at least one second air supply pipeline for conveying the air volume of the air distribution box to each guide tunnel in the tunnel; one end of the second air supply pipeline is connected to the air distribution box, and the other end follows the excavation of the tunnel face.

[0006] In a preferred embodiment: the wind distribution box is provided with an air outlet for transmitting air volume.

[0007] In a preferred embodiment: the air distribution box is also provided with a partition plate for controlling the air output, and the partition plate is arranged at the air outlet.

[0008] In a preferred embodiment: the air distribution box is also provided with a connecting portion for connecting to the first air supply duct, and the connecting portion is located at the periphery of the air outlet.

[0009] In a preferred embodiment: the wind distribution assembly includes 4 wind distribution boxes, and the wind distribution boxes are made of welded steel.

[0010] In a preferred embodiment: the wind distribution box is arranged in the tunnel guide hole close to the arch wall.

[0011] In a preferred embodiment: the fan is a silent tunnel variable frequency axial flow fan, and the fan includes a support frame and a main unit.

[0012] In a preferred embodiment: the first air supply duct and the second air supply duct are PVC coated cloth positive pressure air belts.

[0013] Compared with the prior art, the technical solution of the utility model has the following beneficial effects:

[0014] 1. The utility model provides a tunnel ventilation device for excavating multiple pilot tunnels by using a partition wall method in a tunnel intersection. By arranging air distribution boxes in each pilot tunnel in the tunnel, the air distribution boxes are connected in series through a first air supply duct to form a channel connecting each pilot tunnel. A fan is provided at the tunnel shield shaft. The fan is used to guide air flow and replace air. The fan connects external air into the channel through the first air supply duct. The air supply component follows up with the excavation of the tunnel face and delivers the air flow in the channel to each pilot tunnel. In this way, the air in each pilot tunnel in the dark excavated tunnel can be fully replaced in a sealed environment to avoid serious production accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic elevation view of the tunnel ventilation device described in the preferred embodiment 1 of the utility model;

[0016] Figure 2 It is a top view of the tunnel ventilation device described in the preferred embodiment 1 of the utility model;

[0017] Figure 3 This is a schematic structural diagram of the wind distribution box described in the preferred embodiment 1 of the utility model. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "installed / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0021] Example 1

[0022] refer to Figure 1-Figure 3 The present embodiment provides a tunnel ventilation device for tunnel crossing and multi-guide tunnel excavation by partition wall method, comprising: an air supply component 1, a pipe component 2, an air sub-component 3 and an air supply component 4; the air supply component 1 comprises a fan for guiding air flow and replacing air, and the fan is installed in the tunnel shield shaft; the pipe component 2 comprises a first air supply pipe 21 for conveying air flow; the first air supply pipe 21 connects the fan and the air sub-component 3, so that the air flow at the fan is conveyed into the air sub-component 3; the air sub-component 3 at least comprises The invention comprises an air distribution box 31 for distributing the air volume to each guide tunnel in the tunnel, and the air distribution box 31 is placed in each guide tunnel in the tunnel; two adjacent air distribution boxes 31 along the height direction of the guide tunnel are connected, and are connected in series with the first air supply duct 21 to form a channel connecting each guide tunnel for conveying air volume; the air supply component 4 comprises at least one second air supply duct 41 for conveying the air volume of the air distribution box 31 to each guide tunnel in the tunnel; one end of the second air supply duct 41 is connected to the air distribution box 31, and the other end follows the excavation of the tunnel face.

[0023] In detail, in this embodiment, the tunnel ventilation device is suitable for tunnel construction projects that use the CDR method 4 to excavate the pilot tunnels. The tunnel ventilation device provides a suitable construction environment for the construction of each pilot tunnel in the tunnel. The air supply component 1 guides the air flow and replaces the air, provides air volume for each pilot tunnel in the tunnel, and then provides air volume to the four pilot tunnels after being diverted by the air distribution component 3. The air supply component 4 allows the air volume to reach the tunnel face directly, which significantly improves the air flow and air quality in the tunnel. The tunnel ventilation device can also be arranged at the tunnel entrance and connected to a temporary construction platform.

[0024] The air supply assembly 1 includes a fan for guiding air flow and replacing air, and the fan is installed in the tunnel shield shaft. The fan includes a support frame and a main unit. The fan is a silent tunnel variable frequency axial flow fan, and the fan model is: GSDF-BP-NO.12.5, 75kW, and the air volume is 1500-2300m 3 / min, which is suitable for this tunnel construction after ventilation calculation. In this embodiment, an axial flow fan is used to replace air, which produces low noise and can reduce the impact on the surrounding environment. The fan is connected to the air distribution box 31 of the air distribution component 3 through the first air supply duct 21, so that the air volume at the fan is transported into the air distribution box 31.

[0025] In this embodiment, the wind division component 3 includes four wind division boxes 31. It can be understood that the wind division component 3 includes at least one wind division box 31 for diverting the air volume to each guide tunnel in the tunnel. The four wind division boxes 31 are respectively located in the four guide tunnels. Preferably, the wind division box 31 is placed in the tunnel guide tunnel close to the arch wall. The wind division box 31 is made of 0.3mm Q235B steel by welding, and the size is 1.2m*1.2m*1.2m. The wind division box 31 is provided with an air outlet 311 and a partition plate 312. The air outlet 311 is used to transmit air volume. The partition plate 312 can control the size of the opening of the air outlet 311, and then control the air volume of the air outlet 311. The partition plate 312 is arranged at the position of the air outlet 311. The air distribution box 31 is also provided with a connecting portion 313, which is a 20 cm long steel cylinder and is welded to the periphery of the air outlet 311. The first air supply duct 21 of the duct assembly 2 connects the connecting portions 313 of two adjacent air distribution boxes 31, so that the air volume is transferred from the previous air distribution box 31 to the next air distribution box 31, ensuring the smooth transfer of the air volume in the channel. The connection between the connecting portion 313 and the first air supply duct 21 is also reinforced with steel wire.

[0026] The air supply assembly 4 includes at least one second air supply duct 41, and the second air supply duct 41 is used to transmit the air volume of the air distribution box 31 to each guide tunnel in the tunnel. One end of the second air supply duct 41 is connected to the connecting portion 313 of the air distribution box 31, and the other end is followed by the excavation of the tunnel face to ensure that the air in each guide tunnel in the tunnel is fully replaced. The second air supply duct 41 of the air supply assembly 4 is arranged along the direction of tunnel excavation. The second air supply duct 41 is connected to the connecting portion 313 with steel wire reinforcement to ensure the stability of the connection. In this embodiment, the first air supply duct 21 and the second air supply duct 41 are PVC coated cloth positive pressure air belts.

[0027] CRD construction, full name Cross-middle partition wall method, is a tunnel construction method suitable for soft strata, especially for controlling surface subsidence, and is generally used in urban subway construction. The CRD method is used to reserve core soil, and the large-section tunnel is divided into 4 relatively independent small caverns for construction. The CRD method follows the construction principle of "small division, short steps, short cycles, fast closure, frequent measurement, and strong support". From top to bottom, it is divided into blocks into rings, and the initial support is done in time as the excavation is carried out. After the settlement and convergence of the arch of the initial support structure are basically stable, the temporary middle partition wall and temporary invert in the initial support structure are removed from top to bottom, and then construction is carried out. The CRD method is suitable for excavation with a large span and strict control of surrounding rock settlement and deformation. When the CRD method is used for excavation, each step of the excavation is closed into a ring, which has the advantages of the step method and the double-side wall pilot method, which is conducive to the stability of the surrounding rock and ensures construction safety.

[0028] The above is only a preferred specific implementation method of the utility model, but the design concept of the utility model is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the utility model within the technical scope disclosed by the utility model shall be deemed to infringe the protection scope of the utility model.

Claims

1. A tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method, characterized in that: include: An air supply component, a pipeline component, an air distribution component and an air supply component; the air supply component includes a fan for guiding air volume and replacing air, and the fan is installed in a tunnel shield shaft; the pipeline component includes a first air supply pipeline for conveying air volume; the first air supply pipeline connects the fan and the air distribution component so that the air volume at the fan is conveyed into the air distribution component; the air distribution component includes at least one air distribution box for diverting air volume to each guide tunnel in the tunnel, and the air distribution box is placed in each guide tunnel in the tunnel; two adjacent air distribution boxes along the height direction of the guide tunnel are connected, and are connected in series with the first air supply pipeline to form a channel connecting each guide tunnel for conveying air volume; the air supply component includes at least one second air supply pipeline for conveying the air volume of the air distribution box to each guide tunnel in the tunnel; one end of the second air supply pipeline is connected to the air distribution box, and the other end follows the excavation of the tunnel face.

2. A tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 1, characterized in that: The air distribution box is provided with an air outlet for transmitting air volume.

3. A tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 2, characterized in that: The air distribution box is also provided with a partition plate for controlling the air output, and the partition plate is arranged at the air outlet.

4. A tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 2, characterized in that: The air distribution box is also provided with a connecting portion for connecting to the first air supply duct, and the connecting portion is located at the periphery of the air outlet.

5. The tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 1, characterized in that: The wind distribution assembly includes four wind distribution boxes, and the wind distribution boxes are made by welding steel.

6. A tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 1, characterized in that: The wind distribution box is arranged in the tunnel guide hole close to the arch wall surface.

7. A tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 1, characterized in that: The fan is a silent tunnel variable frequency axial flow fan, and the fan comprises a support frame and a main unit.

8. The tunnel ventilation device for tunnel intersection multi-hole excavation by partition wall method according to claim 1, characterized in that: The first air supply duct and the second air supply duct are PVC coated cloth positive pressure air belts.

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