Positioning device for tunnel inverted arch steel bars

Abstract

The utility model discloses a positioning device for tunnel inverted arch reinforcing steel bars, which is respectively arranged at two arc-direction ends of an inverted arch template and comprises a channel steel base, a reinforcing steel bar protective layer thickness control steel pipe, a first reinforcing steel bar spacing positioning steel plate and a second reinforcing steel bar spacing positioning steel plate, the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are both located above the steel bar protective layer thickness control steel pipe and are each provided with a plurality of steel bar holes used for installing inverted arch steel bars at intervals in the length direction of the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate. And the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are fixed at the upper part of the channel steel base through opposite-penetrating bolts. The device has the advantages that positioning is accurate, displacement of the inverted arch steel bars and the longitudinal steel plate water-stop belts in the concrete pouring process is avoided, the distance and the row distance of the steel bars and the thickness of a steel bar protection layer can be guaranteed at the same time, and the positions of the longitudinal steel plate water-stop belts meet design and standard requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel invert construction, in particular to a positioning device for tunnel invert reinforcement. Background Art

[0002] Tunnel invert generally refers to the bottom part of the tunnel structure in the lower half of the tunnel secondary lining, which is generally interpreted as an arch that is tilted upward. Tunnel invert is generally a reinforced concrete structure. The function of tunnel invert: to form the whole tunnel with the secondary lining; waterproof, increase structural stability.

[0003] At present, since the tunnel invert is a concealed sub-project, workers are quite arbitrary in the construction of the invert, especially in the installation of the invert reinforcement. Most of them use flexible tie rods to position and tie the invert reinforcement. The invert reinforcement is not easy to be accurately positioned during positioning, and the labor input is large. At the same time, due to the insufficient rigidity of the tie rods and tying, the layer spacing and row spacing of the invert structure reinforcement deviate from the design size, which limits the structural force bearing capacity of the invert in the later operation, and the quality risk is high. Summary of the invention

[0004] The purpose of the utility model is to provide a positioning device for tunnel invert arch steel bars in accordance with the above-mentioned deficiencies of the prior art, which is composed of a channel steel base, a steel pipe for controlling the thickness of the steel bar protective layer, a first steel bar spacing positioning steel plate and a second steel bar spacing positioning steel plate, which can not only position the invert arch steel bars, but also fix the longitudinal steel plate waterstop.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A positioning device for tunnel inverted arch reinforcement, the positioning devices are respectively installed at the arc ends of the inverted arch template, the positioning device comprises a channel steel base, a steel pipe for controlling the thickness of a steel bar protective layer, a first steel bar spacing positioning steel plate and a second steel bar spacing positioning steel plate, the channel steel base is installed at the arc end of the inverted arch template and is arranged at intervals along the length direction of the inverted arch template, the steel pipe for controlling the thickness of a steel bar protective layer is installed at the arc end of the inverted arch template and is placed along the length direction of the inverted arch template, one side of the steel pipe for controlling the thickness of a steel bar protective layer is in close contact with the opening end of the channel steel base, and the other side is located Outside the inverted arch formwork, the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are placed along the length direction of the inverted arch formwork and are both located above the steel bar protective layer thickness control steel pipe. One side of the first steel bar spacing positioning steel plate is tightly attached to the open end of the channel steel base through a support leg. The first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are respectively provided with a plurality of steel bar holes for installing the inverted arch steel bars at intervals along their length directions. The first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are fixed to the upper part of the channel steel base by through bolts.

[0007] There are several groups of steel plate waterstop positioning bolts between the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate. Each group of the steel plate waterstop positioning bolts includes two relatively arranged steel plate waterstop positioning bolts. By adjusting the distance between the two steel plate waterstop positioning bolts on each group of the steel plate waterstop positioning bolts, it is used to clamp the longitudinal steel plate waterstop.

[0008] The steel plate waterstop positioning bolts are installed on the L-shaped parts at the lower parts of the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate.

[0009] Two relatively arranged long holes are opened on the channel steel base.

[0010] The through bolt includes a screw rod and four positioning nuts. The screw rod sequentially passes through the long holes at the upper part of the channel steel base, the screw holes on both sides of the first steel bar spacing positioning steel plate, and the screw holes on both sides of the second steel bar spacing positioning steel plate. The four positioning nuts are respectively arranged in pairs on both sides of the first steel bar spacing positioning steel plate and both sides of the second steel bar spacing positioning steel plate.

[0011] A number of threaded sleeves are arranged at intervals along the length direction of the steel bar protective layer thickness control steel pipe. The steel bar protective layer thickness control steel pipe and the channel steel base are connected through the cooperation of the threaded sleeve and the bolt. The bolt passes through the long hole at the lower part of the channel steel base and is threadedly connected with the threaded sleeve.

[0012] The diameter of the steel bar protective layer thickness control steel pipe is equal to the width of the support feet on the first steel bar spacing positioning steel plate. Half of the steel bar protective layer thickness control steel pipe is located on the invert formwork and the other half is located outside the invert formwork.

[0013] The advantages of the present utility model are: precise positioning, avoiding the displacement of the invert steel bars and the longitudinal steel plate waterstop during the concrete pouring process, and can ensure that the spacing, row spacing of the steel bars, the thickness of the steel bar protective layer, and the position of the longitudinal steel plate waterstop meet the design and specification requirements at the same time. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the positioning device for the invert steel bars of the present utility model;

[0015] Figure 2 It is an installation schematic diagram of the positioning device for the invert steel bars of the present utility model. Detailed Embodiment

[0016] The features of the present utility model and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments for the understanding of those skilled in the same industry:

[0017] As Figures 1-2 shown, the markings in the figure are respectively represented as:

[0018] Inverted arch formwork 1, channel steel base 2, long opening 2-1, steel bar cover thickness control steel pipe 3, first steel bar spacing positioning steel plate 4, second steel bar spacing positioning steel plate 5, support leg 6, steel bar hole 7, inverted arch steel bars 8, through bolts 9, screw rod 9-1, positioning nut 9-2, steel plate water stop positioning bolt 10, L-shaped part 11, threaded sleeve 12, bolt 13, screw rod hole 14.

[0019] Embodiment: As Figures 1-2As shown in the figure, this embodiment relates to a positioning device for the tunnel invert steel bars. The positioning device is respectively installed at the arc-shaped two ends of the invert formwork 1. The positioning device mainly includes a channel steel base 2, a steel bar cover thickness control steel pipe 3, a first steel bar spacing positioning steel plate 4 and a second steel bar spacing positioning steel plate 5. The channel steel base 2 is installed at the arc-shaped end of the invert formwork 1 and is provided with several at intervals along the length direction of the invert formwork 1. Two long openings 2-1 are arranged oppositely and vertically on the channel steel base 2. The steel bar cover thickness control steel pipe 3 is installed at the arc-shaped end of the invert formwork 1 and is placed along the length direction of the invert formwork 1. One side of the steel bar cover thickness control steel pipe 3 is closely attached to the open end of the channel steel base 2, and the other side is outside the invert formwork 1. Specifically, half of the steel bar cover thickness control steel pipe 3 is on the invert formwork 1 and the other half is outside the invert formwork 1. The distance of the part of the steel bar cover thickness control steel pipe 3 outside the invert formwork 1 (the radius of the steel bar cover thickness control steel pipe 3) is the thickness of the invert steel bar cover; several threaded sleeves 12 are arranged at intervals along the length direction of the steel bar cover thickness control steel pipe 3. The steel bar cover thickness control steel pipe 3 and the channel steel base 2 are connected through the cooperation of the threaded sleeve 12 and the bolt 13. The bolt 13 passes through the long opening 2-1 at the lower part of the channel steel base 2 and is threadedly connected with the threaded sleeve 12.The first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5 are arranged oppositely. Both the first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5 are of channel steel structure. Both the first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5 are placed along the length direction of the invert formwork 1 and are both located above the steel bar protection layer thickness control steel pipe 3. One side of the first steel bar spacing positioning steel plate 4 is closely attached to the open end of the channel steel base 2 through a support leg 6. The width of the support leg 6 on the first steel bar spacing positioning steel plate 4 is equal to the diameter of the steel bar protection layer thickness control steel pipe 3. A number of steel bar holes 7 are respectively arranged at intervals along the length direction of the first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5. The steel bar holes 7 are used for installing the invert steel bars 8. The first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5 are fixed to the upper part of the channel steel base 2 through through bolts 9. Specifically, the through bolt 9 includes a screw rod 9-1 and four positioning nuts 9-2. The screw rod 9-1 sequentially passes through the long through holes 2-1 in the upper part of the channel steel base 2, the screw holes 14 on both sides of the first steel bar spacing positioning steel plate 4, and the screw holes 14 on both sides of the second steel bar spacing positioning steel plate 5. The four positioning nuts 9-2 are respectively arranged in pairs on both sides of the first steel bar spacing positioning steel plate 4 and both sides of the second steel bar spacing positioning steel plate 5. In other words, the screw rod 9-1 sequentially passes through the long through hole 2-1 in the upper part of the channel steel base 2, the positioning nut 9-2 on one side of the first steel bar spacing positioning steel plate 4, the screw hole 14 on one side of the first steel bar spacing positioning steel plate 4, the screw hole 14 on the other side of the first steel bar spacing positioning steel plate 4, the positioning nut 9-2 on the other side of the first steel bar spacing positioning steel plate 4, the positioning nut 9-2 on one side of the second steel bar spacing positioning steel plate 5, the screw hole 14 on one side of the second steel bar spacing positioning steel plate 5, the screw hole 14 on the other side of the second steel bar spacing positioning steel plate 5, and the positioning nut 9-2 on the other side of the second steel bar spacing positioning steel plate 5. By adjusting the distance between the positioning nuts 9-2, the row spacing of the invert steel bars 8 can be controlled. The positioning nuts 9-2 are also used for fixing between the screw rod 9-1 and the steel bar spacing positioning steel plates (the first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5).

[0020] As Figures 1-2 shown, a number of groups of steel plate waterstop positioning bolts 10 are arranged between the first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5. Each group of steel plate waterstop positioning bolts 10 includes two relatively arranged steel plate waterstop positioning bolts 10. By adjusting the distance between the two steel plate waterstop positioning bolts 10 in each group of steel plate waterstop positioning bolts 10, it is used to clamp the longitudinal steel plate waterstop to prevent the longitudinal steel plate waterstop from shifting. In addition, the steel plate waterstop positioning bolts 10 are installed on the L-shaped parts 11 at the lower parts of the first steel bar spacing positioning steel plate 4 and the second steel bar spacing positioning steel plate 5.

[0021] As Figures 1-2As shown in the figure, the positioning device for the tunnel invert steel bars in this embodiment also has the following usage method:

[0022] 1. After the initial support of the tunnel invert is accepted as qualified, tie the steel bars on the outside of the invert, and at the same time install the second steel bar spacing positioning steel plate 5.

[0023] 2. Tie the steel bars on the inside of the invert, and at the same time install the first steel bar spacing positioning steel plate 4.

[0024] 3. Install the steel bar cover thickness control steel pipe 3, and tighten the bolts 13 on the channel steel base 2.

[0025] 4. Move the invert formwork 1 into position.

[0026] 5. Install the screw rod 9-1 and the positioning nut 9-2, rotate and adjust the spacing of the positioning nut 9-2 to control the row spacing of the inside and outside steel bars, and then fix them.

[0027] 6. Adjust the position and exposed height of the longitudinal steel plate waterstop, tighten the steel plate waterstop positioning bolt 10, and fix the position of the longitudinal steel plate waterstop.

[0028] The beneficial technical effects of this embodiment are as follows: precise positioning, avoiding the displacement of the tunnel invert steel bars and the longitudinal steel plate waterstop during the concrete pouring process, and can ensure that the spacing, row spacing of the steel bars, the steel bar cover thickness, and the position of the longitudinal steel plate waterstop meet the design and specification requirements at the same time.

[0029] Although the above embodiments have described in detail the concept and embodiments of the present invention with reference to the drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present invention without departing from the scope defined by the claims. Therefore, they are not elaborated here one by one.

Claims

1. A positioning device for tunnel invert reinforcement, characterized in that: The positioning devices are respectively installed at the arc ends of the inverted arch formwork, and the positioning devices include a channel steel base, a steel pipe for controlling the thickness of a steel bar protective layer, a first steel bar spacing positioning steel plate, and a second steel bar spacing positioning steel plate. The channel steel base is installed at the arc end of the inverted arch formwork and is provided with a plurality of steel bar holes spaced apart along the length direction of the inverted arch formwork. The steel pipe for controlling the thickness of a steel bar protective layer is installed at the arc end of the inverted arch formwork and is placed along the length direction of the inverted arch formwork. One side of the steel pipe for controlling the thickness of a steel bar protective layer is in close contact with the open end of the channel steel base, and the other side is located outside the inverted arch formwork. The first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are both placed along the length direction of the inverted arch formwork and are both located above the steel pipe for controlling the thickness of a steel bar protective layer. One side of the first steel bar spacing positioning steel plate is in close contact with the open end of the channel steel base through a support leg. The first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are respectively provided with a plurality of steel bar holes for installing inverted arch steel bars spaced apart along their length directions. The first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate are fixed to the upper part of the channel steel base by through bolts.

2. A tunnel invert reinforcement positioning device as claimed in claim 1, characterized in that: Several groups of steel plate waterstop positioning bolts are arranged between the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate, and each group of the steel plate waterstop positioning bolts includes two relatively arranged steel plate waterstop positioning bolts. By adjusting the distance between the two steel plate waterstop positioning bolts on each group of the steel plate waterstop positioning bolts, the longitudinal steel plate waterstop is clamped.

3. A tunnel invert reinforcement positioning device as claimed in claim 2, characterized in that: The steel plate water stop strip positioning bolts are installed on the L-shaped pieces at the lower parts of the first steel bar spacing positioning steel plate and the second steel bar spacing positioning steel plate.

4. A tunnel invert reinforcement positioning device as claimed in claim 1, characterized in that: The channel steel base is provided with two long openings arranged up and down relatively.

5. A tunnel invert reinforcement positioning device as claimed in claim 4, characterized in that: The through bolt includes a screw and four positioning nuts. The screw passes through the long opening on the upper part of the channel steel base, the screw holes on both sides of the first steel bar spacing positioning steel plate, and the screw holes on both sides of the second steel bar spacing positioning steel plate in sequence. The four positioning nuts are respectively arranged on both sides of the first steel bar spacing positioning steel plate and both sides of the second steel bar spacing positioning steel plate.

6. A tunnel invert reinforcement positioning device as claimed in claim 4, characterized in that: The steel pipe for controlling the thickness of the steel bar protective layer is provided with a plurality of threaded sleeves at intervals along its length direction. The steel pipe for controlling the thickness of the steel bar protective layer is connected to the channel steel base through the cooperation of the threaded sleeves and bolts. The bolts pass through the long opening at the lower part of the channel steel base and are threadedly connected with the threaded sleeves.

7. The positioning device for a tunnel invert reinforcement according to claim 1, characterized in that: The diameter of the steel pipe controlled by the thickness of the steel bar protective layer is equal to the width of the support leg on the first steel bar spacing positioning steel plate, and half of the steel pipe controlled by the thickness of the steel bar protective layer is located on the inverted arch formwork, and the other half is located outside the inverted arch formwork.

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