Prefabricated cut-and-cover highway tunnel cross-passage structure and construction method therefor

Abstract

Disclosed is a prefabricated cut-and-cover highway tunnel cross-passage structure, relating to the technical field of tunnel construction. The tunnel cross-passage structure comprises a cross passage transversely connected between a left-bore passage and a right-bore passage, wherein a smoke exhaust passage in communication with both the left-bore passage and the right-bore passage is provided at a top of the cross passage, and a smoke exhaust duct is mounted within the smoke exhaust passage; a plurality of filter plate sets are mounted side by side within the smoke exhaust duct, wherein each filter plate set comprises two filter plates respectively mounted on two opposite inner walls of the smoke exhaust duct, a notch is provided between each filter plate and the inner wall of the smoke exhaust duct, and two filter plates in the same filter plate set are arranged in a staggered configuration to form a zigzag smoke exhaust passageway; branch ducts in communication with the smoke exhaust duct and the cross passage are provided on the smoke exhaust duct, the plurality of branch pipes are arranged below the filter plates in a one-to-one correspondence manner, and a collection container is detachably mounted within the branch ducts. The present invention allows for particulate matter in smoke to be filtered out by means of filter plates while the smoke passes through a smoke exhaust duct, with the filtered particulate matter deposited into a collection container, thereby facilitating discharge after collection.

Description

A cross passage structure for open-cut prefabricated tunnels in highways and its construction method Technical Field

[0001] This invention belongs to the field of tunnel construction technology, specifically relating to a cross passage structure for a prefabricated open-cut highway tunnel and its construction method. Background Technology

[0002] A tunnel cross passage is a structure connecting two parallel tunnels. During construction, it is excavated from the side of one tunnel to the side of another, thus forming the tunnel cross passage. The cut-and-cover method is a traditional construction method for tunnels and underground engineering. Its main steps include: first, excavating a foundation pit or trench from the ground surface down to the design elevation; then, constructing the main structure and waterproofing work in the foundation pit; and finally, backfilling the earthwork to restore the surface.

[0003] For long or ultra-long tunnels, smoke exhaust ducts are needed to quickly remove smoke from the tunnel into the driving lanes during disasters such as fires. For example, the multi-functional cross passage structure and construction method for tunnels disclosed in prior art (CN 113818901 B) reduces the risks during tunnel construction and operation by using a smoke exhaust cross passage structure with equal cross-sections. However, due to the large amount of dust inside the tunnel, the process of exhausting smoke through the exhaust duct using fans can easily cause dust accumulation in the exhaust duct or block the fans, affecting the exhaust efficiency.

[0004] Therefore, it is necessary to propose a cross passage structure for prefabricated open-cut tunnels on highways and its construction method to solve the above problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a cross passage structure for prefabricated open-cut tunnels for highways and its construction method, in order to solve the problem in the prior art that dust accumulation in the exhaust duct or blockage of the fan during the process of exhausting flue gas from the exhaust duct by the fan, thereby affecting the exhaust effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a cross passage structure for a prefabricated open-cut highway tunnel, comprising a cross passage connecting a left-line passage and a right-line passage. A smoke exhaust passage, communicating with both the left and right-line passages, is located at the top of the cross passage. A smoke exhaust pipe is installed within the smoke exhaust passage, and multiple sets of filter plates are installed side-by-side within the smoke exhaust pipe. Each filter plate set includes two filter plates installed on opposite inner walls of the smoke exhaust pipe, with a notch between the filter plates and the inner wall of the smoke exhaust pipe. Two filter plates in the same set are staggered to form a zigzag smoke passage. Branch pipes connecting the smoke exhaust pipe and the cross passage are provided on the smoke exhaust pipe, with multiple branch pipes corresponding to each filter plate below the filter plates. A collection box is detachably installed within each branch pipe.

[0008] Furthermore, the top of the filter plate is inclined in the opposite direction to the flue gas flow direction.

[0009] Furthermore, a guide plate is provided inside the collection box. The end of the guide plate near the filter plate is rotatably connected to the inner wall of the collection box. The end of the guide plate away from the filter plate is inclined in the direction away from the exhaust pipe, and a gap is provided between the end of the guide plate away from the filter plate and the inner wall of the collection box.

[0010] Furthermore, locking blocks for fixing the guide plate are slidably installed on both opposite side walls inside the collection box. The locking blocks are provided with a bayonet that cooperates with the second end of the guide plate. The bayonet can lock or unlock the guide plate by connecting or disengaging from it.

[0011] Furthermore, each of the two opposite side walls inside the collection box is provided with a sliding groove, the extension direction of the sliding groove is consistent with the inclination direction of the guide plate, the locking block is slidably installed in the sliding groove, and a spring is fixedly connected between the locking block and the inner wall of the sliding groove.

[0012] A construction method for a cross passage structure of a prefabricated open-cut highway tunnel includes the following steps:

[0013] S1: After the main tunnel excavation is completed, precast tunnel components for the left and right tunnels are erected. The precast tunnel components are precast as a whole. Multiple precast tunnel components are spliced ​​along the extension direction of the left or right tunnel to form the left or right tunnel. The precast tunnel components located at the cross passages are provided with notches that cooperate with the cross passages. The steel reinforcement in the precast tunnel components is provided with clearance notches.

[0014] S2: Constructing prefabricated components for the transverse passage, wherein the prefabricated components for the transverse passage are fitted with the gap near the gap, and multiple prefabricated components for the transverse passage are spliced ​​together along the extension direction of the transverse passage to form a transverse passage, wherein the prefabricated components for the transverse passage have reserved openings corresponding to the branch pipes one by one.

[0015] S3: Install the exhaust pipe, and insert the branch pipes on the exhaust pipe into the reserved openings respectively;

[0016] S4: Backfill the earthwork above the exhaust pipe to the ground level to complete the construction of the cross passage structure.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention allows dust to be filtered out of the flue gas as it flows through the exhaust pipe. The filtered dust falls into a collection box for easy collection and discharge, preventing dust accumulation in the exhaust pipe that could affect the exhaust efficiency or cause fan blockage. Furthermore, compared to a closed baffle, the filter plate does not change the exhaust pipe channel area, thus having a low impact on exhaust efficiency. The notch design allows flue gas to continue flowing even when the filter plate is blocked.

[0019] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0021] Figure 1 is a schematic diagram of the tunnel structure according to an embodiment of the present invention;

[0022] Figure 2 is a schematic cross-sectional view of the exhaust pipe according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of the collection box structure according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of the splicing of the tunnel prefabricated component and the cross passage prefabricated component according to an embodiment of the present invention.

[0025] The following are the markings in the attached diagram: left channel 1, right channel 2, horizontal channel 3, exhaust pipe 4, filter plate 5, notch 6, branch pipe 7, collection box 8, guide plate 801, slide 802, locking block 9, bayonet 901, spring 902. Detailed Implementation

[0026] As shown in Figures 1-4, the present invention provides a cross passage structure for a prefabricated open-cut highway tunnel, comprising: a cross passage 3 transversely connecting the left-line passage 1 and the right-line passage 2; a smoke exhaust passage is provided at the top of the cross passage 3, the smoke exhaust passage is connected to the left-line passage 1 and the right-line passage 2; a smoke exhaust pipe 4 is installed in the smoke exhaust passage; multiple sets of filter plates 5 are installed side by side in the smoke exhaust pipe 4; each set of filter plates 5 includes two filter plates 5 respectively installed on the inner walls of opposite sides of the smoke exhaust pipe 4; a notch 6 is provided between the filter plates 5 and the inner wall of the smoke exhaust pipe 4; two filter plates 5 in the same set of filter plates 5 are staggered to form a zigzag smoke passage; a branch pipe 7 is provided on the smoke exhaust pipe 4 to connect the smoke exhaust pipe 4 and the cross passage 3; multiple branch pipes 7 are arranged one-to-one below the filter plates 5; and a collection box 8 is detachably installed in the branch pipe 7.

[0027] In this scheme, fireproof curtains are installed at the connection points of the left channel 1 and the right channel 2 with the horizontal channel 3. When the smoke is drawn in by the fan, the smoke passes through the smoke exhaust pipe 4 and is filtered by the filter plate 5 to remove dust from the smoke, causing the dust to fall into the collection box 8. The dust is then removed by disassembling the collection box 8.

[0028] This design allows the flue gas to pass through the filter plate 5 during its flow within the exhaust pipe 4, filtering out dust particles. The filtered dust falls into the collection box 8 for easy collection and discharge, preventing dust accumulation in the exhaust pipe 4 from affecting the flue gas discharge effect or causing fan blockage. Furthermore, compared to a closed baffle, the filter plate 5 does not change the channel area of ​​the exhaust pipe 4, thus having a low impact on exhaust efficiency. The notch 6 ensures that flue gas continues to flow even when the filter plate 5 is blocked.

[0029] In one embodiment of the present invention, the top of the filter plate 5 is inclined in the opposite direction to the flue gas flow direction. This facilitates dust settling as the flue gas passes through the filter plate 5.

[0030] In one embodiment of the present invention, a guide plate 801 is provided on the collection box 8. The first end of the guide plate 801 is rotatably connected to the inner wall of the collection box 8, and the second end of the guide plate 801 is inclined in a direction away from the exhaust pipe 4. A gap is provided between the second end of the guide plate 801 and the inner wall of the collection box 8 so that dust can slide down along the guide plate 801 and fall into the collection box 8 from the gap.

[0031] In this scheme, the dust falling from the filter plate 5 slides down through the guide plate 801 and falls into the collection box 8 through the gap, so as to prevent the dust from flowing back from the collection box 8 into the exhaust pipe 4 due to the negative pressure when the fan is drawing air.

[0032] In one embodiment of the present invention, locking blocks 9 for fixing the guide plate 801 are slidably installed on both opposite side walls inside the collection box 8. The locking blocks 9 are provided with a bayonet 901 that cooperates with the second end of the guide plate 801. The bayonet 901 can lock or unlock the guide plate 801 by connecting or disengaging from the guide plate 801.

[0033] In this design, the locking block 9 is U-shaped. When the locking block 9 is slid to connect the buckle 901 with the guide plate 801, the guide plate 801 cannot rotate, so as to fix the guide plate 801 and prevent the guide plate 801 from shaking due to negative pressure. When the locking block 9 is slid to disengage the buckle 901 from the guide plate 801, the guide plate 801 can rotate, so as to open the collection box 8 and pour out the dust inside.

[0034] In one embodiment of the present invention, the two opposite side walls of the collection box 8 are provided with sliding grooves 802, the extension direction of the sliding grooves 802 is consistent with the inclination direction of the guide plate 801, the locking block 9 is slidably installed in the sliding grooves 802, and a spring 902 is fixedly connected between the locking block 9 and the inner wall of the sliding grooves 802.

[0035] In this solution, a spring 902 is provided to ensure stability when the guide plate 801 is locked, and to prevent the locking block 9 from sliding down in the tilt direction and disengaging from the guide plate 801.

[0036] A construction method for a cross passage structure of a prefabricated open-cut highway tunnel includes the following steps:

[0037] S1: After the main tunnel excavation is completed, as shown in Figure 4, precast tunnel components 10 for the left tunnel 1 and the right tunnel 2 are erected. The precast tunnel components 10 are precast as a whole. The precast tunnel components 10 located at the cross tunnel 3 are provided with a notch 11 that cooperates with the cross tunnel 3. The steel reinforcement avoidance notch 11 is provided in the precast tunnel components 10.

[0038] S2: Erect a prefabricated cross passage component 12, which is fitted with a notch 11. The prefabricated cross passage component 12 has a reserved opening 13 corresponding to the branch pipe 7.

[0039] S3: Install the exhaust pipe 4, and insert the branch pipes 7 on the exhaust pipe 4 into the reserved openings respectively;

[0040] S4: Backfill the earthwork above the exhaust pipe 4 to the ground level to complete the construction of the cross passage structure.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A highway open cut fabricated tunnel cross passage structure comprising a cross passage transversely connected between a left line passage and a right line passage, characterized in that: The top of the transverse channel is provided with a smoke exhaust channel that communicates with both the left and right channels. A smoke exhaust pipe is installed in the smoke exhaust channel, and multiple sets of filter plate groups are installed side by side in the smoke exhaust pipe. Each filter plate group includes two filter plates installed on the inner walls of opposite sides of the smoke exhaust pipe. There is a gap between the filter plate and the inner wall of the smoke exhaust pipe. The two filter plates in the same set are staggered to form a zigzag smoke channel. The smoke exhaust pipe is provided with branch pipes that connect the smoke exhaust pipe and the transverse channel. Multiple branch pipes are arranged one-to-one below the filter plates. A collection box is detachably installed in each branch pipe.

2. The highway open cut fabricated tunnel cross passage structure according to claim 1, characterized in that: The top of the filter plate is inclined in the opposite direction to the flue gas flow direction.

3. The highway open cut fabricated tunnel cross passage structure according to claim 1, characterized in that: The collection box is equipped with a guide plate. The end of the guide plate near the filter plate is rotatably connected to the inner wall of the collection box. The end of the guide plate away from the filter plate is inclined in the direction away from the exhaust pipe, and there is a gap between the end of the guide plate away from the filter plate and the inner wall of the collection box.

4. The highway open cut fabricated tunnel cross passage structure according to claim 1, characterized in that: Locking blocks for fixing the guide plate are slidably installed on both opposite side walls inside the collection box. The locking blocks are provided with a bayonet that cooperates with the second end of the guide plate. The bayonet can lock or unlock the guide plate by connecting or disengaging from it.

5. The highway open cut fabricated tunnel cross passage structure according to claim 1, characterized in that: The collection box has grooves on both opposite side walls. The extension direction of the grooves is consistent with the inclination direction of the guide plate. The locking block is slidably installed in the groove, and a spring is fixedly connected between the locking block and the inner wall of the groove.

6. A construction method of a highway open cut fabricated tunnel cross passage structure according to any one of claims 1 to 5, characterized in that, Includes the following steps: S1: After the main tunnel excavation is completed, precast tunnel components for the left and right tunnels are erected. The precast tunnel components are precast as a whole. Multiple precast tunnel components are spliced ​​along the extension direction of the left or right tunnel to form the left or right tunnel. The precast tunnel components located at the cross passages are provided with notches that cooperate with the cross passages. The steel reinforcement in the precast tunnel components is provided with clearance notches. S2: Constructing prefabricated components for the transverse passage, wherein the prefabricated components for the transverse passage are fitted with the gap near the gap, and multiple prefabricated components for the transverse passage are spliced ​​together along the extension direction of the transverse passage to form a transverse passage, wherein the prefabricated components for the transverse passage have reserved openings corresponding to the branch pipes one by one. S3: Install the exhaust pipe, and insert the branch pipes on the exhaust pipe into the reserved openings respectively; S4: Backfill the earthwork above the exhaust pipe to the ground level to complete the construction of the cross passage structure.

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