Drainage system of large-section water delivery tunnel

Abstract

The drainage system is characterized in that a drainage plate is laid on the inner side of a shield segment in the length direction of the tunnel, the drainage plate is an arc-shaped plate located on the upper portion of the inner wall of the shield segment and provided with a 240-degree central angle, an isolation drainage layer is formed, and the space between the drainage plate and a lining steel pipe is filled with self-compacting concrete. A tunnel portal ring beam surrounding the drainage plate is arranged on the side, located on the tunnel portal, of the shield segment, a whole circle of water collecting grooves are formed in the outer side face of the tunnel portal ring beam, the water collecting grooves are aligned with the outer end of the drainage plate in a buckled mode, and the bottom of each water collecting groove is connected to a main drainage pipe through three vertical branch drainage pipes. And the drainage main pipe is connected to a water-collecting well at the working well bottom plate through a drainage ditch to form a drainage system. 2% drainage gradient is formed from the drainage main pipe to the drainage ditch to the water collecting well; the drainage structure is safe and reliable, the drainage plate drainage measure is adopted, the problem of drainage behind the tunnel structure wall is effectively solved, and reference can be provided for similar projects.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy project construction, in particular to a large-section tunnel drainage system. Background Art

[0002] During the construction of water conveyance tunnels, many large-diameter circular working wells need to be built. With the development of my country's economy, more and more water conservancy projects have been built in recent years, especially during the construction of water conveyance tunnels, many large-section tunnels need to be built. In order to meet the water pressure requirements, this type of tunnel lining usually adopts a structure that combines lining steel pipes and self-compacting concrete. In previous construction, there are usually two types of tunnel waterproofing processes. One is to grout behind the wall of the pipe segment to make the wall of the pipe segment dense and form a water-blocking channel; the other is to set pads and water-expanding rubber strips at the joints of the pipe segments, fill the caulking materials, and reduce the amount of water seepage. Even so, there is often water seepage in the tunnel. Therefore, it is urgent to propose a drainage system for large-section water conveyance tunnels to effectively discharge the seepage water out of the tunnel and into the water collection well, and finally discharge it to the surrounding water pipe network system. Utility Model Content

[0003] In view of the above-mentioned prior art, the utility model provides a drainage system for a large-section water conveyance tunnel, which can effectively discharge the seepage water in the tunnel out of the tunnel.

[0004] In order to solve the above technical problems, the utility model proposes a drainage system for a large-section water conveyance tunnel, the large-section water conveyance tunnel involved includes an inner lining steel pipe and a shield segment, the outer surface of the inner lining steel pipe is provided with a stiffening rib, and the bottom of the inner lining steel pipe is provided with a long driving lane along the length direction of the tunnel; a drainage board is laid on the inner wall of the shield segment along the length direction of the tunnel, the drainage board is an arc-shaped plate located on the upper part of the inner wall of the shield segment, the central angle of the arc-shaped plate is 240°, and self-compacting concrete is filled between the drainage board and the inner lining steel pipe, and the shield segment is provided with a portal ring beam surrounding the drainage board on one side of the tunnel portal, the outer side surface of the portal ring beam, the outer side surface of the self-compacting concrete and the outer side surface of the drainage board are in the same plane P, and the outer side surface of the drainage board is in the same plane P. A full circle of annular water collection troughs is provided on the plane P, and the position of the water collection trough is arranged in alignment with the outer end of the drainage board. Anchor bars are provided on the side walls of the water collection trough. Three vertical drainage branch pipes are provided at the bottom of the water collection trough. The three vertical drainage branch pipes are evenly distributed within a range of 90° with a central angle symmetrical to the central facade of the tunnel. The lower ends of the three vertical drainage branch pipes are connected to a drainage main pipe, the drainage main pipe is connected to a drainage ditch, and the drainage ditch is connected to a water collection well. The drainage ditch and the water collection well are both arranged at the bottom plate of the working well, and the drainage slope from the drainage main pipe to the drainage ditch and from the drainage ditch to the water collection well is 2%; the above-mentioned drainage board, water collection trough, drainage branch pipe, drainage main pipe, drainage ditch and water collection well are connected in sequence to form a drainage system.

[0005] Furthermore, the drainage system of the large-section water conveyance tunnel described in the utility model, wherein:

[0006] The side wall of the water collection trough is composed of an inner plate and an outer plate, which are located on the side away from the drainage plate. The inner plate and the outer plate are connected by a closing plate to form an annular water collection trough with an opening facing plane P.

[0007] The drain board is composed of a flame-retardant drain board and a non-flame-retardant drain board overlapped with each other. The drain board made of flame-retardant material is pasted on the welding annular seam of the lining steel pipe, and the drain board made of non-flame-retardant material is pasted on the non-annular seam of the lining steel pipe.

[0008] The outer side surface of the shield segment is provided with an annular embedded steel plate, and the portal ring beam is welded and fixed to the embedded steel plate by anchor bars; a rubber water stop strip that swells when exposed to water is pasted at the welding point, and the rubber water stop strip is coated with a retarding expansion agent; positioning bars for fixing the rubber water stop strip are welded on the main steel bars of the portal ring beam.

[0009] The anchoring bars arranged on the side wall of the trough include 8 anchoring bars welded evenly distributed on the inner plate and the outer plate of the trough in the circumferential direction of the trough, and are used to be anchored in the outer concrete poured later.

[0010] The diameter of the anchor bar is 20 mm, and the length of a single bar is 750 mm.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model is safe and reliable, adopts drainage measures, effectively solves the drainage problem behind the tunnel structure wall, and can provide a reference for similar projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a simplified structural diagram of the water delivery tunnel in the utility model;

[0014] Figure 2 It is a schematic plan view of the overall structure of the drainage system of the large-section water conveyance tunnel of the utility model;

[0015] Figure 3 yes Figure 2 Schematic diagram of the cross section at the AA sectioning position;

[0016] Figure 4 yes Figure 3 A partial schematic diagram of the

[0017] Figure 5 yes Figure 4 Schematic diagram of the cross section of the middle BB sectioning location;

[0018] Figure 6 yes Figure 5 A partial enlarged view of part C in the middle.

[0019] In the figure:

[0020] 1-Lined steel pipe 11-Strengthening rib 2-Self-compacting concrete

[0021] 31-drainage board 32-water collection tank 321-anchor bar

[0022] 322-Inner plate of water collecting tank 323-Outer plate of water collecting tank 33-Drainage branch pipe

[0023] 34- Drainage main 35- Drainage ditch 36- Water collection well

[0024] 4- shield segment 5- driving lane 6- portal ring beam

[0025] 61- Anchor bar 62- Embedded steel plate 63- Rubber water stop strip

[0026] 64-Positioning rib 7-Working well bottom plate DETAILED DESCRIPTION

[0027] The utility model proposes a drainage system for water seepage in a large-section water supply tunnel. The large-section water supply tunnel involved in the utility model includes an inner lining steel pipe 1 and a shield segment 4. The outer surface of the inner lining steel pipe 1 is provided with a stiffening rib 11. In order to facilitate vehicles to enter the tunnel for maintenance work during operation, a long driving lane 5 is provided at the bottom of the inner lining steel pipe 1 along the length of the tunnel. A drainage board 31 is laid on the inner wall of the shield segment 4 along the length of the tunnel to form an isolation drainage layer. The drainage board 31 is an arc-shaped plate located on the upper part of the inner wall of the shield segment 4. The central angle of the arc-shaped plate is 240°. The space between the drainage board 31 and the inner lining steel pipe 1 is filled with self-compacting concrete 2, such as Figures 1 to 6 As shown. The drain board 31 is composed of a flame retardant drain board and a non-flame retardant drain board overlapped with each other. The flame retardant drain board is used for the welded circumferential seam of the lining steel pipe 1, and the non-flame retardant drain board is used for the non-circumferential seam of the lining steel pipe 1. The corresponding glue can be used to stick to the welded circumferential seam and non-circumferential seam of the lining steel pipe 1. In this embodiment, the inner diameter of the lining steel pipe 1 is 4.8 meters and the thickness is 0.02 meters. The height of the stiffening rib 11 is 0.12 meters. The thickness of the self-compacting concrete layer 2 is 0.3 meters. The outer diameter of the shield segment 4 is 6 meters and the thickness is 0.3 meters. The width of the carriageway 5 is 2.5 meters and the height is 0.35 meters.

[0028] The shield segment 4 is provided with a portal ring beam 6 surrounding the drainage board 31 on one side of the tunnel portal. The outer side surface of the portal ring beam 6, the outer side surface of the self-compacting concrete 2 and the outer side surface of the drainage board 31 are in the same plane, which is denoted as plane P. A full circle of annular water collecting trough 32 is provided on plane P. The position of the water collecting trough 32 is arranged to be aligned with the outer end of the drainage board 31. The side wall of the water collecting trough 32 is composed of an inner plate 322 and an outer plate 323 of the water collecting trough, and is located on the side away from the drainage board 31. The inner plate 322 and the outer plate 323 of the water collecting trough are connected by a closing plate, thereby forming an annular water collecting trough 32 with an opening facing plane P.

[0029] Anchor bars 321 are arranged outside the side wall of the water collecting trough 32, and three vertical drainage branches 33 are arranged at the bottom of the water collecting trough 32. The three vertical drainage branches 33 are evenly distributed within a range of 90° with a central angle symmetrical to the central elevation of the tunnel. Figure 3 and Figure 4As shown, the lower ends of the three vertical drainage branches 33 are connected to a drainage main pipe 34, the drainage main pipe 24 is connected to a drainage ditch 35, the drainage ditch 35 is connected to a water collection well 36, the drainage ditch 35 and the water collection well 36 are arranged at the bottom plate 7 of the working well, and the drainage main pipe 34 to the drainage ditch 35 and the drainage ditch 35 to the water collection well 36 have a drainage slope of 2%; the above-mentioned drainage board 31, water collection trough 32, drainage branch pipe 33, drainage main pipe 34, drainage ditch 35 and water collection well 36 are connected in series in sequence to form a drainage system, as shown in FIG. Figures 2 to 6 shown.

[0030] In the utility model, the outer side of the shield segment 4 is provided with an annular embedded steel plate 62, and the portal ring beam 6 is welded and fixed to the embedded steel plate 62 through anchor bars 61; a rubber water stop strip 63 that swells when exposed to water is pasted at the welding point, and the rubber water stop strip 63 is coated with a slow expansion agent. At the same time, after the slow expansion agent is firmly pasted, a positioning rib 64 for fixing the rubber water stop strip 63 is welded on the main steel bar of the portal ring beam 6, such as Figure 5 and Figure 6 shown.

[0031] The anchoring bars arranged outside the side wall of the water collecting tank 32 include 8 anchoring bars 321 which are evenly distributed and welded on the inner plate 322 and the outer plate 323 of the water collecting tank in the circumferential direction of the water collecting tank. In this embodiment, the diameter of the anchoring bars 321 is 20 mm, and the length of a single bar is 750 mm, which is used to be anchored in the outer concrete poured later. Figure 6 As shown, the side of the water collecting tank is in a closed state to prevent water from overflowing. In this embodiment, the eight inner and outer anchor bars are respectively arranged in the corresponding radial directions, such as Figure 3 and Figure 4 shown.

[0032] The construction process of this utility model is:

[0033] The drain board 31 in this embodiment is composed of two layers of materials, a convex shell type drain board and a polyethylene foam board, and the peel strength should not be less than 0.8N / mm. During construction, a tooling platform is used to install the drain board 31. First, the surface of the shield segment 4 in the area where the drain board 31 needs to be bonded is cleaned, and there is no rainwater, debris, etc. on the surface. Glue is applied within the range of 240° between the convex shell surface of the drain board 31 and the upper center angle of the shield segment 4, and the drain board 31 is directly bonded to the shield segment 4 immediately to ensure that it does not fall off before and during the pouring of the self-compacting concrete.

[0034] First, remove the negative ring segments at the portal. The order of removal is to remove the upper segments first, then the lower segments. After the removal is completed, set up the operating frame. Then carry out the reinforcement binding, formwork installation, concrete pouring and maintenance of the portal ring beam 6. During the reinforcement binding process, all anchor bars 61 are accurately welded to the embedded steel plates 62 of the shield segments 4. After the anchor bars 61 are welded, the positioning bars 64 are welded. The water-expandable waterproofing strips that have been pasted are not damaged during welding, and the welding quality must meet the relevant requirements; when pouring concrete, use the hopper + chute method to enter the warehouse. The entire portal ring beam 6 concrete pouring is completed at one time, and no construction joints are generated, ensuring that it is tightly attached to the end wall of the tunnel portal after the formwork is removed and firmly connected. Finally, the water collection trough 32 and the drainage pipe (including the vertical drainage branch pipe 33 and the drainage main pipe 34) are installed. The water collection trough 32 is made of S30408 ​​stainless steel with a wall thickness of 6mm. The whole ring is divided into four equal blocks and manufactured in advance in the factory. Eight U-shaped anchor bars 321 with a diameter of 20mm are welded on the inside and outside of the water collection trough 32. The anchor bars 321 are arranged at intervals of 45° along the circumferential direction. The water collection trough 32 is fixed to the side of the tunnel ring beam 6 to collect the seepage near the drainage plate 31; all the drainage pipes in this embodiment are made of S30408 ​​stainless steel with a wall thickness of 4mm. During construction, three U-shaped anchor bars 321 are welded at the bottom of the left and right tunnel water collection troughs. Drainage branch pipes 33, three drainage branch pipes 33 at the bottom are merged into one drainage main pipe 34, and the drainage main pipe 34 merges into the drainage ditch 35 with a 2% transverse slope, and then merges into the water collection well 36 at the bottom plate position with a 2% longitudinal slope.

[0035] Although the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the guidance of the utility model, ordinary technicians in this field can make many improvements and changes without departing from the purpose of the utility model, all of which are within the protection of the utility model.

Claims

1. A drainage system for a large-section water conveyance tunnel, the large-section water conveyance tunnel comprising a lining steel pipe (1) and a shield segment (4), the outer surface of the lining steel pipe (1) being provided with a stiffening rib (11), and the bottom of the lining steel pipe (1) being provided with a through-length carriageway (5) along the length direction of the tunnel; characterized in that: A drainage board (31) is laid on the inner wall of the shield segment (4) along the length direction of the tunnel. The drainage board (31) is an arc-shaped board located at the upper part of the inner wall of the shield segment (4). The central angle of the arc-shaped board is 240 degrees. Self-compacting concrete (2) is filled between the drainage board (31) and the inner lining steel pipe (1). The shield segment (4) is provided with a tunnel portal ring beam (6) surrounding the drainage board (31) on one side of the tunnel portal. The outer side surface of the tunnel portal ring beam (6), the outer side surface of the self-compacting concrete (2) and the outer side surface of the drainage board (31) are on the same plane P. A full-circle annular water collecting trough (32) is provided on the plane P. The position of the water collecting trough (32) is arranged to be aligned with the outer end of the drainage board (31). Anchor bars are provided on the side wall of the water collecting trough (32). Three vertical drainage branch pipes (33) are arranged at the bottom of the trough (32). The three vertical drainage branch pipes (33) are evenly distributed in a range of 90° with a central angle symmetrical to the central elevation of the tunnel. The lower ends of the three vertical drainage branch pipes (33) are connected to a drainage main pipe (34). The drainage main pipe (34) is connected to a drainage ditch (35). The drainage ditch (35) is connected to a water collection well (36). The drainage ditch (35) and the water collection well (36) are both arranged at the bottom plate (7) of the working well. The drainage main pipe (34) to the drainage ditch (35) and the drainage ditch (35) to the water collection well (36) all have a drainage slope of 2%. The above-mentioned drainage board (31), water collection trough (32), drainage branch pipe (33), drainage main pipe (34), drainage ditch (35) and water collection well (36) are connected in sequence to form a drainage system.

2. The drainage system for a large-section water conveyance tunnel according to claim 1, characterized in that: The side wall of the water collecting trough (32) is composed of an inner plate (322) and an outer plate (323) of the water collecting trough, and is located on a side away from the drainage plate (31). The inner plate (322) and the outer plate (323) of the water collecting trough are connected by a closing plate, thereby forming an annular water collecting trough (32) with an opening facing the plane P.

3. The drainage system for a large-section water conveyance tunnel according to claim 1, characterized in that: The drain board (31) is composed of a flame retardant drain board and a non-flame retardant drain board overlapped with each other, the flame retardant drain board is adhered to the welding annular seam of the lining steel pipe (1), and the non-flame retardant drain board is adhered to the non-annular seam of the lining steel pipe (1).

4. The drainage system for a large-section water conveyance tunnel according to claim 1, characterized in that: The outer side surface of the shield segment (4) is provided with an annular embedded steel plate (62), and the portal ring beam (6) is welded and fixed to the embedded steel plate (62) via anchor bars (61); a rubber water stop strip (63) that swells when exposed to water is pasted at the welding point, and the rubber water stop strip (63) is coated with a slow expansion agent; and positioning bars (64) for fixing the rubber water stop strip (63) are welded to the main steel bars of the portal ring beam (6).

5. The drainage system for a large-section water conveyance tunnel according to claim 2, characterized in that: The anchoring bars arranged outside the side wall of the water collecting trough (32) include 8 anchoring bars (321) welded evenly distributed on the inner plate (322) and the outer plate (323) of the water collecting trough in the circumferential direction of the water collecting trough, and are used to be anchored in the outer concrete poured later.

6. The drainage system for a large-section water conveyance tunnel according to claim 5, characterized in that: The diameter of the anchor bar (321) is 20 mm, and the length of a single bar is 750 mm.

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