Tunnel roof air duct structure

Abstract

The utility model discloses a kind of tunnel top air duct structures, including tunnel and the air duct of being located at tunnel top, air duct is formed by a plurality of slot units splicing, slot unit includes prefabricated bottom plate and two prefabricated side plates, the two sides of prefabricated bottom plate are respectively with connecting plate, first installation groove is equipped on the outer wall of connecting plate, first bolt hole is communicated between first installation groove and the top surface of connecting plate, the bottom of the two sides of prefabricated side plate is respectively equipped with second installation groove, second bolt hole is communicated between second installation groove and the bottom surface of prefabricated side plate, the top of prefabricated side plate is fixedly connected with the top wall of tunnel, the butt joint of connecting plate and the bottom end of prefabricated side plate, each first installation groove and each second installation groove are one-to-one corresponding arrangement, each first bolt hole and each second bolt hole are one-to-one corresponding communication, connecting bolt is arranged in the first bolt hole and the second bolt hole of intercommunication, all. The tunnel top air duct structure of the utility model has short construction period, high efficiency, and can guarantee the connecting strength.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering technology, specifically to a tunnel roof ventilation duct structure. Background Technology

[0002] With the continuous development of underground engineering, the mileage of underground rail transit and vehicular tunnels is constantly increasing, requiring good ventilation conditions during use. Ventilation ducts are typically installed at the top of the tunnel, serving as crucial structural components of the ventilation system. Current technology often employs cast-in-place concrete structures, generally using two construction methods. One method involves pouring the ventilation duct structure first, followed by the roof slab concrete. This method impacts construction progress and makes it difficult to guarantee the project schedule. Furthermore, the low height of the ventilation duct structure makes dismantling the roof support frame erected within the duct difficult and resource-intensive. The other method involves constructing the main tunnel structure first, followed by the ventilation duct structure. This method presents significant challenges in controlling the quality of the ventilation duct concrete, requires the secondary erection of support frames for the ventilation duct structure, wastes materials, and increases costs.

[0003] Chinese patent application number 202411365554.1 discloses a box-type precast concrete rail-top ventilation duct and its construction method. The rail-top ventilation duct includes a left precast side plate, a right precast side plate, a precast bottom plate, and a precast top plate. The left and right precast side plates have corbels at their upper parts and inwardly extending horizontal side plate lugs at their bottoms. The precast top plate is supported and fixed by the corbels on both sides. The side plate lugs on both sides are connected to the precast bottom plate via post-cast strips. The joints of the top plate unit section or the bottom plate unit section are staggered with the joints of the side plate unit sections. In this box-type precast concrete rail-top ventilation duct, the side plate lugs on both sides are connected to the precast bottom plate via post-cast strips, resulting in a long construction period, low efficiency, and difficulty in ensuring connection strength. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a tunnel top ventilation duct structure that has a short construction period, high efficiency, and can guarantee connection strength.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A tunnel roof ventilation duct structure includes a tunnel and a ventilation duct located at the top of the tunnel. The ventilation duct is formed by sequentially splicing multiple trough-shaped units along the tunnel's extension direction. Each trough-shaped unit includes a precast base plate and two precast side plates. The base plate has upwardly extending connecting plates on both sides. The outer wall of each connecting plate has multiple first mounting grooves spaced apart along its length. First bolt holes communicate between the first mounting grooves and the top surface of the connecting plates. The bottom of each of the precast side plates has multiple second mounting grooves spaced apart along its length. The two mounting slots are connected to the bottom surface of the precast side panels by second bolt holes. The tops of the two precast side panels are fixedly connected to the top wall of the tunnel. The connecting plates on both sides of the precast bottom plate are respectively connected to the bottom ends of the two precast side panels. Each first mounting slot and each second mounting slot are arranged in a one-to-one correspondence. Each first bolt hole and each second bolt hole are connected in a one-to-one correspondence. Connecting bolts are passed through the connected first bolt holes and second bolt holes. The connecting bolts are clamped to the upper side wall of the first mounting slot and the lower side wall of the second mounting slot to fix the precast side panels and connecting plates.

[0006] As a further improvement to the above technical solution: The height of the first or second mounting groove is greater than the length of the connecting bolt.

[0007] Both the first and second mounting slots are filled with cement mortar.

[0008] The connecting plate is perpendicular to the precast base plate.

[0009] The connecting plate and the precast base plate are precast as a single unit.

[0010] A first flexible pad is sandwiched between the top surface of the connecting plate and the bottom surface of the prefabricated side plate.

[0011] A second flexible pad is sandwiched between adjacent precast base plates.

[0012] A third flexible pad is sandwiched between adjacent precast side panels.

[0013] The connecting plate is provided with a first reinforcing rib around each of the first mounting slots, and the prefabricated side plate is provided with a second reinforcing rib around each of the second mounting slots.

[0014] The precast side panels are fixedly connected to the structural steel bars at the top of the tunnel by pre-embedded steel bars.

[0015] Compared with the prior art, the advantages of this utility model are: The tunnel top ventilation duct structure of this utility model uses prefabricated side plates and connecting plates to be connected by prefabricated second mounting grooves, first bolt holes, and second bolt holes. The prefabricated side plates and connecting plates are fixed by connecting bolts passing through the first bolt holes and the second bolt holes and clamping them to the upper side wall of the first mounting groove and the lower side wall of the second mounting groove. This achieves a fixed connection between the prefabricated bottom plate and the two prefabricated side plates. Compared with the existing post-pouring strip connection, this method has a shorter construction period, higher efficiency, and can ensure connection strength. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the tunnel top ventilation duct structure of this utility model.

[0017] Figure 2 yes Figure 1 An enlarged structural diagram of point A.

[0018] Figure 3 This is a side view schematic diagram of the tunnel top ventilation duct structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the connection structure of the prefabricated side panels of the tunnel top ventilation duct structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the main structure of the prefabricated base plate of the tunnel top ventilation duct structure of this utility model.

[0021] Figure 6 This is a top view schematic diagram of the prefabricated base plate of the tunnel top ventilation duct structure of this utility model.

[0022] Figure 7 This is a schematic diagram of the reinforcing ribs of the tunnel top ventilation duct structure of this utility model.

[0023] The labels in the diagram represent: 1. Tunnel; 2. Groove unit; 21. Precast base plate; 22. Precast side plate; 221. Second mounting groove; 222. Second bolt hole; 223. Embedded steel bar; 23. Connecting plate; 231. First mounting groove; 232. First bolt hole; 3. Connecting bolt; 4. Cement mortar; 5. First flexible pad; 6. Second flexible pad; 7. Third flexible pad; 8. First reinforcing rib; 9. Second reinforcing rib. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Figures 1 to 7This invention illustrates an embodiment of a tunnel top ventilation duct structure. The tunnel top ventilation duct structure of this embodiment includes a tunnel 1 and a ventilation duct located at the top of the tunnel 1. The ventilation duct is formed by sequentially splicing multiple trough-shaped units 2 along the extension direction of the tunnel 1. Each trough-shaped unit 2 includes a prefabricated base plate 21 and two prefabricated side plates 22. The prefabricated base plate 21 has upwardly extending connecting plates 23 on both sides. The outer wall of the connecting plates 23 is provided with multiple first mounting grooves 231 spaced apart along the length direction. First bolt holes 232 communicate between the first mounting grooves 231 and the top surface of the connecting plates 23. The bottom of both sides of the prefabricated side plates 22 are provided with multiple second mounting grooves 22 spaced apart along the length direction. 1. A second bolt hole 222 is connected between the second mounting groove 221 and the bottom surface of the precast side plate 22. The top ends of the two precast side plates 22 are fixedly connected to the top wall of the tunnel 1. The connecting plates 23 on both sides of the precast bottom plate 21 are respectively connected to the bottom ends of the two precast side plates 22. Each first mounting groove 231 and each second mounting groove 221 are arranged in a one-to-one correspondence. Each first bolt hole 232 and each second bolt hole 222 are connected in a one-to-one correspondence. A connecting bolt 3 is passed through the connected first bolt hole 232 and second bolt hole 222. The connecting bolt 3 is clamped to the upper side wall of the first mounting groove 231 and the lower side wall of the second mounting groove 221 to fix the precast side plate 22 and the connecting plate 23.

[0029] In this tunnel's top ventilation duct structure, the precast side panels 22 and connecting plates 23 are connected correspondingly via precast second mounting grooves 221, first bolt holes 232, and second bolt holes 222. Connecting bolts 3 pass through the first bolt holes 232 and the second bolt holes 222 and are clamped to the upper side wall of the first mounting groove 231 and the lower side wall of the second mounting groove 221 to fix the precast side panels 22 and connecting plates 23. This achieves a fixed connection between the precast bottom plate 21 and the two precast side panels 22. Compared with the existing method of using post-cast strips for connection, this method has a shorter construction period, higher efficiency, and can ensure connection strength.

[0030] Furthermore, in this embodiment, the height of the first mounting groove 231 or the second mounting groove 221 is greater than the length of the connecting bolt 3. This facilitates the installation of the connecting bolt 3. Of course, in other embodiments, one side of the first bolt hole 232 and the second bolt hole 222 may be left open to allow the connecting bolt 3 to be inserted laterally.

[0031] Furthermore, such as Figure 2 As shown, in this embodiment, both the first mounting groove 231 and the second mounting groove 221 are filled with cement mortar 4. Preferably, the cement mortar 4 completely fills the first mounting groove 231 and the second mounting groove 221, and smooths the outer side.

[0032] Furthermore, such as Figure 1 , Figure 2 and Figure 5As shown, in this embodiment, the connecting plate 23 is perpendicular to the precast base plate 21. The connecting plate 23 and the precast base plate 21 are integrally precast.

[0033] Furthermore, such as Figure 2 As shown, in this embodiment, a first flexible pad 5 is sandwiched between the top surface of the connecting plate 23 and the bottom surface of the prefabricated side plate 22 to improve the sealing of the connection. Preferably, the first flexible pad 5 is a rubber pad.

[0034] Furthermore, such as Figure 6 As shown, in this embodiment, a second flexible pad 6 is sandwiched between adjacent precast base plates 21 to improve the sealing at the joint. Preferably, the second flexible pad 6 is a rubber pad.

[0035] Furthermore, such as Figure 3 As shown, in this embodiment, a third flexible pad 7 is sandwiched between adjacent prefabricated side panels 22 to improve the sealing at the joint. Preferably, the third flexible pad 7 is a rubber pad.

[0036] Furthermore, in this embodiment, the connecting plate 23 is provided with a first reinforcing rib 8 around each of the first mounting grooves 231, and the prefabricated side plate 22 is provided with a second reinforcing rib 9 around each of the second mounting grooves 221. Specifically, after the connecting bolts 3 are installed, the first reinforcing ribs 8 and the second reinforcing ribs 9 are tightened. On the one hand, the first reinforcing ribs 8 and the second reinforcing ribs 9 can increase the structural strength of the connecting plate 23 and the prefabricated side plate 22; on the other hand, they can increase the connection strength between the connecting plate 23 and the prefabricated side plate 22.

[0037] Furthermore, in this embodiment, the prefabricated side plate 22 is fixedly connected to the structural steel bars at the top of the tunnel 1 by pre-embedded steel bars 223.

[0038] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A tunnel roof ventilation structure, comprising a tunnel (1) and a ventilation duct disposed on the roof of the tunnel (1), characterized in that: The air duct is formed by sequentially splicing multiple trough-shaped units (2) along the extension direction of the tunnel (1). Each trough-shaped unit (2) includes a precast base plate (21) and two precast side plates (22). The precast base plate (21) has connecting plates (23) extending upward on both sides. The outer wall of the connecting plate (23) is provided with multiple first mounting grooves (231) spaced apart along the length direction. The first mounting grooves (231) are connected to the top surface of the connecting plate (23) with first bolt holes (232). The bottom of both sides of the precast side plate (22) is provided with multiple second mounting grooves (221) spaced apart along the length direction. The second mounting grooves (221) are connected to the bottom surface of the precast side plate (22) with first bolt holes (232). Two bolt holes (222), the top ends of the two prefabricated side plates (22) are fixedly connected to the top wall of the tunnel (1) respectively, the connecting plates (23) on both sides of the prefabricated bottom plate (21) are respectively connected to the bottom ends of the two prefabricated side plates (22), each of the first mounting grooves (231) and each of the second mounting grooves (221) are arranged in a one-to-one correspondence, each of the first bolt holes (232) and each of the second bolt holes (222) are connected in a one-to-one correspondence, and connecting bolts (3) are passed through the connected first bolt holes (232) and second bolt holes (222), and the connecting bolts (3) are clamped to the upper side wall of the first mounting groove (231) and the lower side wall of the second mounting groove (221) to fix the prefabricated side plate (22) and the connecting plate (23).

2. The tunnel roof ventilation duct structure according to claim 1, characterized in that: The height of the first mounting groove (231) or the second mounting groove (221) is greater than the length of the connecting bolt (3).

3. The tunnel roof ventilation duct structure according to claim 1, characterized in that: Both the first mounting groove (231) and the second mounting groove (221) are filled with cement mortar (4).

4. The tunnel roof ventilation duct structure according to claim 1, characterized in that: The connecting plate (23) is perpendicular to the precast base plate (21).

5. The tunnel roof ventilation duct structure according to claim 1, characterized in that: The connecting plate (23) and the precast base plate (21) are precast together.

6. The tunnel roof ventilation duct structure according to claim 1, characterized in that: A first flexible pad (5) is sandwiched between the top surface of the connecting plate (23) and the bottom surface of the prefabricated side plate (22).

7. The tunnel roof ventilation duct structure according to claim 1, characterized in that: A second flexible pad (6) is sandwiched between adjacent precast base plates (21).

8. The tunnel roof ventilation duct structure according to claim 1, characterized in that: A third flexible pad (7) is sandwiched between adjacent precast side panels (22).

9. The tunnel roof ventilation duct structure according to claim 1, characterized in that: The connecting plate (23) is provided with a first reinforcing rib (8) around each of the first mounting slots (231), and the prefabricated side plate (22) is provided with a second reinforcing rib (9) around each of the second mounting slots (221).

10. The tunnel roof ventilation structure according to any one of claims 1 to 9, characterized in that: The precast side plate (22) is fixedly connected to the structural steel bars at the top of the tunnel (1) by pre-embedded steel bars (223).

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