Deeply-buried central ditch transition structure of single-line cold region tunnel and construction method

Abstract

The invention belongs to the field of underground engineering, and particularly relates to a single-line cold region tunnel deeply-buried center ditch transition structure and a construction method.The transition structure comprises a starting section, a middle section and an ending section, the middle section is longitudinal transition ditches arranged along the two sides of a tunnel, and the gradient j% of the longitudinal transition ditches is smaller than the gradient i% of tunnel longitudinal slopes; the initial section comprises an initial inspection well chamber arranged on one side, the bottom of the tunnel and a rectangular culvert connected with the deep-buried central ditch, tunnel side ditches on the two sides are connected with the rectangular culvert through pre-buried drainage pipes, and initial points of the two longitudinal transition ditches are located on the two sides of the bottom of the rectangular culvert respectively. The ending section comprises ending inspection well chambers and transverse transition ditches which are arranged on the two sides, ending points of the longitudinal transition ditches are located in the two ending inspection well chambers respectively, and the transverse transition ditches are connected with the longitudinal transition ditches and the tunnel side ditches. Not only can cold-proof measures be reasonably implemented, but also the operation and maintenance requirements can be met.

Description

Technical Field

[0001] The present invention belongs to the field of underground engineering, and particularly relates to a transition structure and construction method for a deep-buried central drainage ditch in a single-track cold region tunnel. Background Art

[0002] In China, the cold regions cover a wide area and there is a strong demand for transportation. As an effective way to cross mountains and hills, tunnel engineering has been widely used in cold region transportation construction. When setting a deep-buried central drainage ditch in a single-track cold region tunnel, the water collected in the deep-buried central drainage ditch in the high-end portal section needs to be introduced into the side ditch. Due to the large elevation difference and the complex structure at the side ditch of the single-track tunnel, the introduction is difficult. Therefore, other anti-freezing measures with poor effects are usually adopted instead of the deep-buried central drainage ditch in the high-end portal section of the single-track tunnel, and the anti-freezing effect is often not good. Therefore, how to reasonably set a transition structure for the deep-buried central drainage ditch in the high-end section of a single-track cold region tunnel has become an important issue to solve tunnel freezing damage. Summary of the Invention

[0003] The purpose of the present invention is to provide a transition structure and construction method for a deep-buried central drainage ditch in a single-track cold region tunnel, which is used to solve the problems of difficult water introduction from the deep-buried central drainage ditch in the high-end portal section of a single-track cold region tunnel into the side ditch or poor anti-freezing effect.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A transition structure for a deep-buried central drainage ditch in a single-track cold region tunnel, with tunnel side ditches on both sides of the tunnel, includes a starting section, a middle section, and an ending section. The middle section is a longitudinal transition drainage ditch arranged along both sides of the tunnel, and the slope j% of the longitudinal transition drainage ditch is less than the slope i% of the tunnel longitudinal slope, and ends when the bottom elevation of the longitudinal transition drainage ditch is higher than the bottom elevation of the tunnel side ditch.

[0006] Further, the starting section includes a starting inspection well chamber arranged on one side, a rectangular culvert connecting the tunnel bottom and the deep-buried central drainage ditch. The tunnel side ditches on both sides are connected to the rectangular culvert through pre-buried drain pipes, and the starting points of the two longitudinal transition drainage ditches are respectively located on both sides of the bottom of the rectangular culvert.

[0007] Further, the ending section includes ending inspection well chambers arranged on both sides and a transverse transition drainage ditch. The termination points of the longitudinal transition drainage ditches are respectively located in the two ending inspection well chambers, and the transverse transition drainage ditch connects the longitudinal transition drainage ditch and the tunnel side ditch.

[0008] Further, inspection wells are provided in both the starting inspection well chamber and the ending inspection well chamber.

[0009] Further, the center of the bottom of the rectangular culvert is higher than both sides of the bottom, and its slope is 1%.

[0010] Furthermore, the slope of the transverse transition water channel is 2%.

[0011] A construction method for the transition structure of the deep-buried central water channel in a single-track cold-region tunnel. The construction of the starting section includes the following steps:

[0012] S1: Determine the reasonable depths of the starting inspection well and the rectangular culvert in combination with the depths of the deep-buried central water channel and the longitudinal transition water channel;

[0013] S2: After the rectangular culvert, the starting inspection well chamber, and the starting inspection well are excavated synchronously with the tunnel, and all initial supports are constructed synchronously;

[0014] S3: Construct the secondary lining of the rectangular culvert and the inspection well, and reserve holes for the drain pipe, the deep-buried central water channel, and the longitudinal transition water channel.

[0015] S4: After the secondary lining of the rectangular culvert and the inspection well reaches the required strength, construct the secondary lining of the tunnel and the starting inspection well chamber, the invert filling, and the water channel cable trough.

[0016] Furthermore, the construction of the ending section includes the following steps:

[0017] S1: Determine the reasonable depth of the ending inspection well in combination with the depth of the longitudinal transition water channel;

[0018] S2: After the ending inspection well chamber and the ending inspection well are excavated synchronously with the tunnel, and all initial supports are constructed synchronously;

[0019] S3: Construct the secondary lining of the ending inspection well and the inspection well chamber, and reserve a hole for the transverse transition water channel; S4: After the secondary lining of the ending inspection well and the inspection well chamber reaches the required strength, construct the secondary lining of the tunnel, the invert filling, and the water channel cable trough, and construct the transverse transition water channel.

[0020] Compared with the prior art, the present solution has the following beneficial technical effects:

[0021] By designing a transition structure and a construction method for the deep-buried central water channel in a single-track cold-region tunnel, the present invention first converges the water in the high-end deep-buried central water channel and the tunnel side ditch into the rectangular culvert, then introduces it into the longitudinal transition water channel with a slope smaller than the longitudinal slope of the tunnel, and finally introduces it into the longitudinal ditches on both sides of the tunnel through the low-end inspection well chamber and the transverse transition water channel, effectively solving the problem of setting a deep-buried central water channel in the high-end portal section of a single-track cold-region tunnel. It can not only ensure the reasonable implementation of the cold protection measures but also meet the requirements of operation and maintenance and inspection, thereby improving the cold protection performance and operation safety of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a longitudinal sectional view of the transition structure in an embodiment of the present invention;

[0023] Figure 2Schematic plan view of the transition structure in the embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the starting section structure;

[0025] Figure 4 Schematic diagram of the middle section structure;

[0026] Figure 5 Schematic diagram of the ending section structure.

[0027] Reference numerals: 1 - tunnel side ditch, 2 - longitudinal transition water ditch, 3 - starting inspection well chamber, 4 - rectangular culvert, 5 - drain pipe, 6 - ending inspection well chamber, 7 - transverse transition water ditch, 8 - deeply buried central water ditch. Detailed implementation manners

[0028] The present invention will be further described below in conjunction with the drawings and embodiments.

[0029] Embodiment:

[0030] As Figure 1 , Figure 2 shown, a transition structure for a deeply buried central water ditch of a single-track cold region tunnel includes a deeply buried central water ditch 8, a tunnel side ditch 1, a drain pipe 5, a longitudinal transition water ditch 2, a transverse transition water ditch 7, a rectangular culvert 4, a starting inspection well, a starting inspection well chamber 3, an ending inspection well and an ending inspection well chamber 6.

[0031] It is divided into a starting section, a middle section and an ending section.

[0032] As Figure 3 shown, for the starting section structure of the transition, by arranging a starting inspection well chamber 3 on one side, the wellhead of the starting inspection well is placed on the surface of the chamber floor, and a rectangular culvert 4 is arranged at the bottom of the tunnel to collect the flowing water in the deeply buried central water ditch 8. At the same time, the flowing water in the tunnel side ditch 1 is introduced into the rectangular culvert 4 through the drain pipe 5. Finally, the collected water is dispersed to the two longitudinal transition water ditches 2 on both sides through a 1% slope at the bottom of the rectangular culvert 4 and led downstream. During operation, maintenance personnel can enter the rectangular culvert from the inspection well to clean and maintain the deeply buried central water ditch 8 and the longitudinal transition water ditch 2.

[0033] As Figure 4 shown, for the middle section structure of the transition, the collected water is drained through the two longitudinal transition water ditches 2. The slope j% of the longitudinal transition water ditch 2 is less than the longitudinal slope i% of the tunnel, and it ends when the bottom elevation of the longitudinal transition water ditch 2 is higher than the bottom elevation of the tunnel side ditch 1.

[0034] As Figure 5As shown in the figure, for the transition end section structure, by setting end inspection well chambers 6 on both sides of the tunnel, the wellheads of the end inspection wells are placed on the surface of the chamber floor. The inspection wells on both sides are used to converge the flowing water in the longitudinal transition water channel 2 and introduce it into the tunnel side ditch 1 through the transverse transition water channel 7 with a slope of 2%. During operation, maintenance personnel can clean and maintain the longitudinal transition water channel 2 and the transverse transition water channel 7 through the inspection wells.

[0035] The construction method of the starting end structure of the buried central water channel transition in a single-track cold region tunnel includes the following steps:

[0036] S1: Combining the depths of the buried central water channel 8 and the longitudinal transition water channel 2, determine the reasonable depths of the starting inspection well and the rectangular culvert 4.

[0037] S2: After the rectangular culvert 4, the starting inspection well chamber 3, and the starting inspection well are excavated synchronously with the tunnel, and all initial supports are constructed synchronously.

[0038] S3: Construct the secondary lining of the rectangular culvert 4 and the inspection well, and reserve the holes for the drain pipe 5, the buried central water channel 8, and the longitudinal transition water channel 2.

[0039] S4: After the secondary lining of the rectangular culvert 4 and the inspection well reaches the strength, then construct the secondary lining of the tunnel and the starting inspection well chamber 3, the inverted arch filling, and the water channel cable trough.

[0040] The construction method of the transition end structure of the buried central water channel in a single-track cold region tunnel includes the following steps:

[0041] S1: Combining the depth of the longitudinal transition water channel 2, determine the reasonable depth of the end inspection well.

[0042] S2: After the end inspection well chamber 6 and the end inspection well are excavated synchronously with the tunnel, and all initial supports are constructed synchronously.

[0043] S3: Construct the secondary lining of the end inspection well and the inspection well chamber, and reserve the hole for the transverse transition water channel 7.

[0044] S4: After the secondary lining of the end inspection well and the inspection well chamber reaches the strength, then construct the secondary lining of the tunnel, the inverted arch filling, and the water channel cable trough, and construct the transverse transition water channel 7.

[0045] The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A deep-buried central water ditch transition structure for a single-line cold region tunnel, with tunnel side ditches (1) on both sides of the tunnel, characterized in that: The tunnel comprises a starting section, a middle section and an ending section. The middle section is a longitudinal transition ditch (2) arranged along both sides of the tunnel. The slope j% of the longitudinal transition ditch (2) is less than the slope i% of the longitudinal slope of the tunnel. The tunnel ends when the bottom elevation of the longitudinal transition ditch (2) is higher than the bottom elevation of the tunnel side ditch (1).

2. The deep-buried central water ditch transition structure of a single-track cold region tunnel according to claim 1 is characterized by: The starting section comprises a starting inspection well cavern (3) arranged on one side, a rectangular culvert (4) connected to a deep-buried central ditch (8) at the bottom of the tunnel, tunnel side ditches (1) on both sides connected to the rectangular culvert (4) via pre-buried drainage pipes (5), and the starting points of two longitudinal transition ditches (2) are respectively located on both sides of the bottom of the rectangular culvert (4).

3. The deep-buried central water ditch transition structure of a single-track cold region tunnel according to claim 2 is characterized by: The end section comprises an end inspection well chamber (6) and a transverse transition ditch (7) arranged on both sides, the end points of the longitudinal transition ditch (2) are respectively located in the two end inspection well chambers (6), and the transverse transition ditch (7) connects the longitudinal transition ditch (2) and the tunnel side ditch (1).

4. The deep-buried central water ditch transition structure of a single-track cold region tunnel according to claim 3 is characterized by: Inspection wells are provided in both the starting inspection well chamber (3) and the ending inspection well chamber (6).

5. The deep-buried central water ditch transition structure of a single-track cold region tunnel according to claim 4 is characterized by: The bottom center of the rectangular culvert (4) is higher than the two sides of the bottom, and its slope is 1%.

6. The deep-buried central water ditch transition structure of a single-track cold region tunnel according to claim 4 is characterized by: The slope of the transverse transition ditch (7) is 2%.

7. A construction method for a deep-buried central ditch transition structure of a single-track cold region tunnel as claimed in any one of claims 1 to 6, characterized in that: The construction of the initial section includes the following steps: S1: Determine the reasonable depth of the starting inspection well and the rectangular culvert (4) based on the depth of the deep-buried central ditch (8) and the longitudinal transition ditch (2); S2: After the rectangular culvert (4), the initial inspection well cavern (3), the initial inspection well and the tunnel are excavated simultaneously, all initial supports are constructed simultaneously; S3: construct secondary lining of the rectangular culvert (4) and the inspection well, and reserve holes for the drainage pipe (5), the deep-buried central ditch (8) and the longitudinal transition ditch (2). S4: After the secondary lining of the rectangular culvert (4) and the inspection well reaches the required strength, the secondary lining of the tunnel and the starting inspection well cavern (3), the filling of the invert and the ditch cable trough are constructed.

8. The construction method of the deep-buried central ditch transition structure of a single-track cold region tunnel according to claim 7 is characterized in that: The construction of the end section includes the following steps: S1: Determine the reasonable depth of the end inspection well in combination with the depth of the longitudinal transition ditch (2); S2: After the inspection well chamber (6) is completed, the inspection well and tunnel are excavated synchronously, and all initial supports are constructed synchronously; S3: Complete the secondary lining of the inspection well and the inspection well cavern, and reserve holes for the transverse transition ditch (7); S4: After the secondary lining of the inspection well and the inspection well chamber reaches the required strength, the secondary lining of the tunnel, the filling of the invert and the cable trough are constructed, and the transverse transition ditch (7) is constructed.

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