Long tunnel lining bottom plate elevation protection layer control device

Abstract

The utility model discloses a long tunnel lining bottom plate elevation protection layer control device which is provided with a height adjusting structure and a bottom plate steel reinforcement framework, the height adjusting structure comprises an adjusting bolt and a nut, a concrete cushion block is arranged above the adjusting bolt, the nut is connected with the bottom steel reinforcement framework in a welded mode, and concrete is poured above the device. A plurality of height adjusting structures are arranged on a bottom plate steel reinforcement framework, the height adjusting structures are arranged in a quincunx shape, the distance between every two adjacent height adjusting structures is 1-5 m, a concrete cushion block is arranged on each height adjusting device, and each height adjusting device is adjusted according to construction requirements. And the elevation of a long tunnel lining bottom plate and the thickness of a protective layer meet the requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a device for controlling the elevation protection layer of a lining bottom plate of a long tunnel. Background Art

[0002] A water diversion tunnel project is an engineering project used to bring water from one place to another. This type of project is usually used to solve the problem of water shortage or uneven distribution to ensure the effective use and supply of water resources. It is usually characterized by long water transmission lines, small cross-sections, small slopes, complex geological conditions, high technical requirements, and great construction difficulty. The initial support of the tunnel is mostly a mesh sprayed concrete structure, and the lining is mostly a reinforced concrete structure. The lining concrete is the last construction process, and the quality of concrete pouring is high.

[0003] During the construction of the tunnel lining bottom plate, it is necessary to meet the design slope requirements of 1 / 3000~1 / 1000, as well as the quality requirements of elevation ±1cm and ±1 / 4×net protective layer thickness. However, it is difficult to control the bottom plate elevation and the thickness of the steel bar protective layer during concrete pouring, which can easily lead to uneven bottom plates and excessive steel bar protective layer thickness. The rectification cost is high and the cycle is long. In addition, when water seepage occurs in the tunnel or construction water is not pumped out in time, water will accumulate on the bottom plate in the tunnel, affecting traffic in the tunnel and reducing construction efficiency. Utility Model Content

[0004] At least one of the purposes of the present utility model is to provide a device for controlling the elevation and protective layer of a long tunnel lining bottom plate in order to overcome the problems existing in the above-mentioned prior art, which can provide control points when pouring concrete, solve the problem of difficult control of the pouring elevation and protective layer of the tunnel bottom plate lining concrete, ensure that the construction quality meets the requirements, reduce the cost risk of bottom plate rectification, and improve construction efficiency.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model includes the following aspects.

[0006] A device for controlling the elevation protective layer of the bottom plate of a long tunnel lining is characterized in that it includes a concrete pad, a height adjustment structure and a bottom plate steel reinforcement frame, the height adjustment structure includes an adjusting bolt and a nut, the nut is fixedly arranged on the bottom plate steel reinforcement frame, the adjusting bolt is movably connected to the nut, and the concrete pad is arranged on the top of the adjusting bolt.

[0007] Preferably, an opening is provided in the middle of the concrete pad, the head of the adjusting bolt is a hexagonal head, the hexagonal head is provided with an opening that passes through two opposite surfaces of the hexagonal head, the concrete pad and the adjusting bolt are connected by galvanized steel wire, and the galvanized steel wire passes through the opening of the concrete pad and the opening of the adjusting bolt respectively.

[0008] Preferably, the bottom plate steel bar framework includes transverse structural steel bars and longitudinal structural steel bars. The longitudinal structural steel bars are perpendicular to the transverse structural steel bars, and the transverse structural steel bars are welded to the longitudinal structural steel bars.

[0009] Preferably, the transverse structural steel bars are parallel to the upper end surface of the nut, and the transverse structural steel bars and the longitudinal structural steel bars are welded to the upper end surface of the nut.

[0010] Preferably, the transverse structural steel bars are welded to the upper end surface of the nut, and the longitudinal structural steel bars are welded to the side surface of the nut.

[0011] Preferably, the longitudinal structural steel bars are parallel to the upper end surface of the nut, and the longitudinal structural steel bars are welded to the upper end surface of the nut.

[0012] Preferably, a structural concrete surface is formed above the concrete cushion block. A structural steel bar protection layer is formed between the bottom plate steel bar framework and the structural concrete surface. The thickness h of the structural steel bar protection layer is 20 - 50 mm; the diameters d of the transverse structural steel bars and the longitudinal structural steel bars are both 5 - 10 mm.

[0013] Preferably, the height dimension of the concrete cushion block is less than h.

[0014] Preferably, the length L of the adjusting bolt is: L >= h + 2d + (30 - 100 mm).

[0015] Preferably, it includes a plurality of height adjusting structures. The plurality of height adjusting structures are arranged in a plum blossom shape on the bottom plate steel bar framework, and the distance between adjacent height adjusting structures is 1 - 5 m.

[0016] In summary, due to the adoption of the above technical solutions, the present utility model has at least the following beneficial effects:

[0017] By setting the elevation protection layer control device for the lining bottom plate of the long tunnel, the elevation of the bottom plate and the thickness of the steel bar protection layer are accurately controlled, avoiding phenomena such as uneven bottom plate and excessive thickness of the steel bar protection layer. The rectification cost is small and the efficiency is high, ensuring that the design slope requirements and the quality requirements of the net protection layer are met. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the elevation protection layer control device for the lining bottom plate of the long tunnel according to the exemplary embodiment of the present utility model.

[0019] Reference numerals in the figure: 1 - concrete cushion block, 2 - structural concrete surface, 3 - adjusting bolt, 4 - galvanized steel wire, 5 - nut, 6 - transverse structural steel bar, 7 - longitudinal structural steel bar. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, so as to make the purpose, technical solution and advantages of the present utility model more clear and understandable. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] Referring to Figure 1 , the elevation protection layer control device for the lining floor slab of a long tunnel in an exemplary embodiment of the present utility model includes concrete pads 1, a height adjustment structure, and a floor slab steel bar framework. The height adjustment structure includes adjustment bolts 3 and nuts 5. The nut 5 is fixedly arranged on the floor slab steel bar framework, and the adjustment bolt 3 is movably connected to the nut 5. The concrete pad 1 is arranged on the top of the adjustment bolt 3; a hole is drilled in the middle of the concrete pad 1; the head of the adjustment bolt 3 is a hexagonal head, and the opening of the adjustment bolt 3 penetrates through two opposite surfaces of the hexagonal head; galvanized steel wires 4 are respectively passed through the concrete pad 1 and the adjustment bolt 3 to firmly connect the concrete pad 1 and the adjustment bolt 3 and prevent deviation. A nut 5 used in cooperation with the adjustment bolt 3 is arranged on the adjustment bolt 3; the floor slab steel bar framework includes transverse structural steel bars 6 and longitudinal structural steel bars 7. The diameters of the transverse structural steel bars 6 and the longitudinal structural steel bars 7 are both d (5 - 10 mm); the transverse structural steel bar 6 is arranged on the upper end surface of the nut 5, and the transverse structural steel bar 6 is parallel to the upper end surface of the nut 5; the longitudinal structural steel bar 7 is perpendicular to the transverse structural steel bar 6, and multiple longitudinal structural steel bars 7 are parallel to each other. The transverse structural steel bar 6 and the longitudinal structural steel bar 7 are welded and connected, and both ends of the transverse structural steel bar 6 and the longitudinal structural steel bar 7 are arranged in the concrete layer; the transverse structural steel bar 6 and the longitudinal structural steel bar 7 do not contact the adjustment bolt 3.

[0022] After the elevation protection layer control device for the lining floor slab of the long tunnel is erected, concrete is poured above the device, and a structural concrete surface 2 is formed above the concrete pad 1. A structural steel bar protection layer is formed between the transverse structural steel bar 6 and the structural concrete surface 2, and the thickness of the structural steel bar protection layer is h (20 mm - 50 mm). The height dimension of the concrete pad 1 should be less than h; the length L of the adjustment bolt 3 should be greater than or equal to h + 2d + (30 - 100 mm).

[0023] The nut 5 is fixed to the bottom plate steel bar framework. The nut 5 can be welded to the transverse structural steel bar 6 or the longitudinal structural steel bar 7. The nut 5 can also be arranged at the connection position of the transverse structural steel bar 6 and the longitudinal structural steel bar 7, with its side surface welded to the longitudinal structural steel bar 7 and the top surface welded to the transverse structural steel bar 6 to improve the connection stability. The rotation adjusting bolt 3 is used to adjust the elevation of the surface 2 of the structural concrete and the control points of the thickness of the structural steel bar protection layer. When controlling the elevation of the lining bottom plate of a long tunnel, multiple height adjusting structures can be arranged on the bottom plate steel bar framework, and the multiple height adjusting structures are arranged in a plum blossom shape, with the distance between adjacent height adjusting structures being 1-5 m. After setting the concrete cushion blocks 1 on each height adjusting device, according to the construction requirements, each height adjusting device can be adjusted respectively, so that the elevation of the lining bottom plate of the long tunnel and the thickness of the protection layer meet the requirements.

[0024] The above is only a detailed description of the specific implementation mode of the present utility model, rather than a limitation to the present utility model. Various substitutions, modifications and improvements made by those skilled in the relevant technical fields without departing from the principle and scope of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A device for controlling the elevation protective layer of a long tunnel lining bottom plate, characterized in that: The invention comprises a concrete pad (1), a height adjustment structure and a bottom plate steel reinforcement frame, wherein the height adjustment structure comprises an adjustment bolt (3) and a nut (5), wherein the nut (5) is fixedly arranged on the bottom plate steel reinforcement frame, the adjustment bolt (3) is movably connected to the nut (5), and the concrete pad (1) is arranged on top of the adjustment bolt (3).

2. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 1 is characterized in that: The concrete pad (1) is provided with an opening in the middle, the head of the adjusting bolt (3) is a hexagonal head, and the hexagonal head is provided with an opening that passes through two opposite surfaces of the hexagonal head. The concrete pad (1) and the adjusting bolt (3) are connected by a galvanized steel wire (4), and the galvanized steel wire (4) passes through the opening of the concrete pad (1) and the opening of the adjusting bolt (3), respectively.

3. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 1 is characterized in that: The bottom plate reinforcement skeleton comprises transverse structural reinforcements (6) and longitudinal structural reinforcements (7), wherein the longitudinal structural reinforcements (7) are perpendicular to the transverse structural reinforcements (6), and the transverse structural reinforcements (6) and the longitudinal structural reinforcements (7) are connected by welding.

4. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 3 is characterized in that: The transverse structural steel bar (6) is parallel to the upper end surface of the nut (5), and the transverse structural steel bar (6) and the longitudinal structural steel bar (7) are welded to the upper end surface of the nut (5).

5. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 3 is characterized in that: The transverse structural steel bar (6) is welded to the upper end surface of the nut (5), and the longitudinal structural steel bar (7) is welded to the side surface of the nut (5).

6. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 3 is characterized in that: The longitudinal structural steel bar (7) is parallel to the upper end surface of the nut (5), and the longitudinal structural steel bar (7) is welded to the upper end surface of the nut (5).

7. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 3 is characterized in that: A structural concrete surface (2) is formed above the concrete pad (1), a structural steel bar protective layer is formed between the bottom plate steel bar skeleton and the structural concrete surface (2), and the thickness h of the structural steel bar protective layer is 20 to 50 mm; the diameter d of the transverse structural steel bars (6) and the longitudinal structural steel bars (7) are both 5 to 10 mm.

8. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 7 is characterized in that: The height dimension of the concrete pad (1) is smaller than h.

9. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to claim 7 is characterized in that: The length L of the adjusting bolt (3) is: L>=h+2d+(30-100mm).

10. The device for controlling the elevation protective layer of the long tunnel lining bottom plate according to any one of claims 1 to 9, characterized in that: It comprises a plurality of height adjustment structures, which are arranged in a plum blossom shape on the bottom plate steel reinforcement frame, and the spacing between adjacent height adjustment structures is 1-5m.

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