Bottom plate lining structure of diversion tunnel

Abstract

The utility model discloses a diversion tunnel bottom plate lining structure which comprises a bottom plate layer constructed by concrete, a cushion layer constructed by rock ballast is tightly attached to the lower side of the bottom plate layer, closed ends with strip-shaped structures are arranged on the two sides of the bottom plate layer, a plurality of drainage holes are evenly formed in the bottom plate layer, and the drainage holes are communicated with drainage pipes. According to the diversion tunnel bottom plate lining structure, in-situ backfilling utilization of rock ballast in the tunnel is achieved; according to the lining structure, excavated rock ballast serves as a cushion material of bottom plate concrete, the excavated rock ballast and the bottom plate concrete are poured into an integrated scum concrete structure, and after pouring is completed, the concrete and the rock ballast on the lower portion are integrated, so that the structural requirement of tunnel bottom plate lining is met, and rock ballast materials excavated in a tunnel can be digested on site.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy engineering design and relates to a bottom plate lining structure of a water diversion tunnel. Background Art

[0002] At present, the water diversion system in hydropower projects and pumped storage projects has the characteristics of long lines, deep burial depth, complex geological conditions, and tight construction period. Over-excavation often occurs during the construction process. After tunnel excavation, most of the slag is crushed and screened to make dam building materials or aggregates or materials of cemented sand and gravel and piled up in the slag dump. However, the amount of tunnel slag, especially the slag amount of large-scale projects, is huge. The transportation of slag and the disposal of huge amounts of slag are not only engineering problems, but also affect environmental protection, soil and water conservation, and later operation safety.

[0003] At present, in addition to strengthening support measures, for the over-excavated parts of the tunnel floor, the over-excavated part is usually removed first, and backfilled with low-grade concrete or concrete of the same grade as the tunnel lining. The transportation of slag in the tunnel and the construction progress of the over-excavated parts often restrict the subsequent lining progress, and even affect the construction progress of the entire project, while increasing the project investment.

[0004] Therefore, the existing technology has the problems of large amount of waste slag in the excavation and support of the water diversion tunnel and slow bottom plate lining speed. Utility Model Content

[0005] The utility model aims to provide a water diversion tunnel bottom plate lining structure, which solves the problems of large amount of waste slag and slow bottom plate lining speed in the prior art for water diversion tunnel excavation support.

[0006] The technical solution adopted by the utility model is that the bottom plate lining structure of the water diversion tunnel includes a bottom plate layer constructed of concrete, a cushion layer constructed of slag is tightly attached to the lower side of the bottom plate layer, closed end heads with strip-shaped structures are arranged on both sides of the bottom plate layer, a plurality of drainage holes are evenly arranged on the bottom plate layer, and the drainage holes are connected to drainage pipes.

[0007] The utility model is also characterized in that:

[0008] The drainage pipe passes through the cushion layer and the end face is in contact with the bottom plate layer.

[0009] A number of crack-limiting bars are evenly arranged in the bottom plate layer, and both sides of the cushion layer are fixedly connected to the closed ends.

[0010] The crack-limiting reinforcement is fixedly connected to the upper end of the anchor reinforcement, and the anchor reinforcement is composed of a number of steel bars fixedly connected.

[0011] A number of construction joints are evenly arranged on the bottom plate layer and are arranged parallel to the closed ends, and the construction joints are filled with water stop strips.

[0012] The beneficial effects of the utility model are as follows: the bottom plate lining structure of the water diversion tunnel realizes the on-site backfilling of the slag in the tunnel, reduces the waste slag and increases the speed of the bottom plate lining. The utility model uses the excavated slag as the cushion material of the bottom plate concrete, and casts it with the bottom plate concrete to form an integrated slag concrete structure. After the casting is completed, the concrete and the lower slag are integrated, which not only meets the structural requirements of the tunnel bottom plate lining, but also can digest the excavated slag in the tunnel on-site. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the bottom plate lining structure of the water diversion tunnel of the utility model;

[0014] Figure 2 It is a top view of the bottom plate lining structure of the water diversion tunnel of the utility model.

[0015] In the figure, 1, bottom plate layer; 2, cushion layer; 3, water stop strip; 4, drainage hole; 5, anchor bar; 6, crack limiting bar; 7, drainage pipe; 8, closed end; 9, construction joint. DETAILED DESCRIPTION

[0016] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0017] The bottom lining structure of the water diversion tunnel, such as Figure 1 As shown, it includes a bottom plate layer 1 constructed of concrete, a cushion layer 2 constructed of slag is tightly attached to the lower side of the bottom plate layer 1, closed ends 8 with strip-shaped structures are arranged on both sides of the bottom plate layer 1, and a plurality of drainage holes 4 are evenly arranged on the bottom plate layer 1, and the drainage holes 4 are connected to drainage pipes 7. The drainage pipe 7 passes through the cushion layer 2 and the end face is attached to the bottom plate layer 1. A plurality of crack-limiting bars 6 are evenly arranged in the bottom plate layer 1, and the closed ends 8 are fixedly connected to both sides of the cushion layer 2. The crack-limiting bars 6 are fixedly connected to the upper ends of the anchor bars 5, and the anchor bars 5 are composed of a plurality of steel bars fixedly connected. As shown in FIG. Figure 2 As shown, a plurality of construction joints 9 arranged parallel to the closed end 8 are evenly arranged on the bottom plate layer 1, and the construction joints 9 are filled with water stop strips 3.

[0018] In the bottom lining structure of the water diversion tunnel, the bottom slab layer 1 is poured with concrete, and the poured cement slurry penetrates into the lower cushion layer 2. The upper and lower layers of the structure reinforce each other and are integrated into a slag concrete structure, which jointly bears the load in the tunnel and meets the requirements of anti-floating, impact resistance, wear resistance and stress and strain; the cushion layer 2 uses the slag from the tunnel excavation to backfill and level, which reduces the amount of slag waste and speeds up the construction progress. It also plays the role of isolating, transitioning and leveling the bedrock surface, providing a good foundation for the upper concrete lining; a waterstop 3 is buried in the construction joint 9 to avoid leakage channels; the drainage holes 4 and the crack-limiting bars 6 are set to resist the lifting damage to the bottom slab caused by external water pressure and grouting; the closed end 8 is on the bottom slab layer 1 and the cushion layer 2.

[0019] Example 1

[0020] like Figure 1-2 As shown, this embodiment proposes a water diversion tunnel bottom lining structure, including a bottom slab layer 1 constructed of concrete, a cushion layer 2 constructed of slag tightly attached to the lower side of the bottom slab layer 1, closed end heads 8 with strip-shaped structures are arranged on both sides of the bottom slab layer 1, and a plurality of drainage holes 4 are evenly arranged on the bottom slab layer 1, and the drainage holes 4 are connected to drainage pipes 7.

[0021] Example 2

[0022] like Figure 1-2 As shown, this embodiment proposes a water diversion tunnel bottom lining structure, including a bottom slab layer 1 constructed of concrete, a cushion layer 2 constructed of slag tightly attached to the lower side of the bottom slab layer 1, closed ends 8 with strip-shaped structures are arranged on both sides of the bottom slab layer 1, and a plurality of drainage holes 4 are evenly arranged on the bottom slab layer 1, and the drainage holes 4 are connected to drainage pipes 7. The drainage pipes 7 pass through the cushion layer 2 and the end faces are attached to the bottom slab layer 1. A plurality of crack limiting ribs 6 are evenly arranged in the bottom slab layer 1, and the closed ends 8 are fixedly connected to both sides of the cushion layer 2.

[0023] Example 3

[0024] like Figure 1-2 As shown, this embodiment proposes a water diversion tunnel bottom lining structure, including a bottom slab layer 1 constructed of concrete, a cushion layer 2 constructed of slag tightly attached to the lower side of the bottom slab layer 1, closed end heads 8 with strip-shaped structures are arranged on both sides of the bottom slab layer 1, and a plurality of drainage holes 4 are evenly arranged on the bottom slab layer 1, and the drainage holes 4 are connected to drainage pipes 7.

[0025] The drainage pipe 7 passes through the cushion layer 2 and the end face is in contact with the bottom plate layer 1. A plurality of crack limiting ribs 6 are evenly arranged in the bottom plate layer 1, and the two sides of the cushion layer 2 are fixedly connected to the closed end 8. The crack limiting ribs 6 are fixedly connected to the upper end of the anchor rib 5, and the anchor rib 5 is formed by a plurality of steel bars fixedly connected. A plurality of construction joints 9 are evenly arranged on the bottom plate layer 1 and arranged parallel to the closed end 8, and the construction joints 9 are filled with water stop strips 3.

[0026] The construction steps of the above embodiment are:

[0027] Step 1: Complete the excavation and initial support of the tunnel, and clean the bottom excavation surface;

[0028] Step 2: Carry out the construction of the cushion layer 2, laying, rolling and compacting as required, and ensure that the slag particles in the cushion layer 2 are uniform as a whole, without the phenomenon of segregation and enrichment of coarse and fine materials;

[0029] Step 3: burying the drainage holes 4 and anchor bars 5;

[0030] Step 4: Tie the crack-limiting reinforcement 6, fix and bury the drainage pipe 7 and the water stop 3;

[0031] Step 5: After acceptance, pour the bottom plate layer 1;

[0032] Step 6: Finally, cast the closed ends 8 at both ends.

Claims

1. The bottom lining structure of the water diversion tunnel is characterized by: The invention comprises a bottom plate layer (1) constructed of concrete, a cushion layer (2) constructed of slag being closely attached to the lower side of the bottom plate layer (1), closed end heads (8) having a strip-shaped structure are arranged on both sides of the bottom plate layer (1), a plurality of drainage holes (4) are evenly arranged on the bottom plate layer (1), and the drainage holes (4) are connected to drainage pipes (7).

2. The water diversion tunnel bottom lining structure according to claim 1, characterized in that: The drainage pipe (7) passes through the cushion layer (2) and its end surface is in contact with the bottom plate layer (1).

3. The water diversion tunnel bottom lining structure according to claim 2, characterized in that: A plurality of crack limiting ribs (6) are evenly arranged in the bottom plate layer (1), and both sides of the cushion layer (2) are fixedly connected to closed ends (8).

4. The water diversion tunnel bottom lining structure according to claim 3, characterized in that: The crack-limiting bar (6) is fixedly connected to the upper end of the anchor bar (5), and the anchor bar (5) is composed of a plurality of steel bars fixedly connected.

5. The water diversion tunnel bottom lining structure according to claim 4, characterized in that: A plurality of construction joints (9) arranged parallel to the closed end heads (8) are evenly arranged on the bottom plate layer (1), and the construction joints (9) are filled with water stop strips (3).

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