Round tunnel bottom arch support device

Abstract

The utility model relates to a circular tunnel bottom arch support device, which solves the problem that a fixed steel pipe support of a bottom curved surface concrete bottom plate is difficult in the erection of a circular tunnel top arch concrete pouring template bracket, a first channel steel is in a lower semicircular ring shape at a horizontal position, and two ends of the bottom plate are fixedly connected with the concrete bottom plate which is profiled by the first channel steel through a fastening device; a plurality of vertically upward second channel steels fixedly connected with the bottom plate are uniformly distributed on the bottom plate between the two fastening devices, the upper ends of the second channel steels are fixedly connected with the horizontal steel plate, and the vertical steel bars are fixedly connected with the upper surface of the horizontal steel plate. The utility model has the advantages of simple manufacture, strong bearing capacity, high stability, safety, reliability and convenience in installation and disassembly, and can be reused after being disassembled.

Description

Technical Field

[0001] The utility model relates to a water conservancy and hydropower engineering tunnel concrete construction device, in particular to a circular tunnel bottom arch support device. Background Art

[0002] In hydraulic tunnel projects, the support and stability of the circular tunnel bottom arch is an important part of ensuring the safety of the tunnel structure.

[0003] Conventional circular tunnel bottom arch support adopts embedded steel bars in the concrete bottom plate and steel pipe supports are set up on the steel bars. Since the concrete bottom plate is a circular curved surface, it is difficult for the steel pipe supports to be firmly fixed on the bottom plate. Therefore, the formwork support system has insufficient bearing capacity and poor stability, which poses a safety hazard. It is also easy to damage the original concrete bottom plate surface, resulting in more quality defects, affecting the quality of concrete construction and increasing the cost of subsequent repairs. Summary of the invention

[0004] The utility model aims to provide a circular tunnel bottom arch support device which has simple structure, strong bearing capacity, high stability, is easy to install and dismantle, and can be reused after disassembly.

[0005] The utility model is achieved in this way:

[0006] A circular tunnel bottom arch support device, wherein the first channel steel 1 is a lower semicircular ring in a horizontal position, and both ends of its bottom plate are fixedly connected by fastening devices 5 and a concrete bottom plate 6 that is shaped like the fastening devices 5, and a plurality of vertically upward second channel steels 2 fixedly connected thereto are evenly distributed on the bottom plate between the two fastening devices 5, the upper ends of the second channel steels 2 are fixedly connected to the horizontal steel plate 3, and the vertical reinforcement 4 is fixedly connected to the upper surface of the horizontal steel plate 3.

[0007] The fastening device 5 has embedded bolts 8 and connecting bolts 7 embedded in the concrete base plate. The upper end of the embedded bolt 8 is connected to the internal thread of the lower end of the connecting bolt 7. The lower end of the fastening bolt 11 is connected to the internal thread of the upper end of the connecting bolt 7. The fastening bolt 11 passes through the first channel steel 1, the reinforcing steel plate 9 and the high-strength nut 10. The reinforcing steel plate 9 is fastened by the high-strength nut 10 to fix the first channel steel 1 on the concrete base plate. The reinforcing steel plate 9 is welded to the first channel steel 1, the bottom end of the second channel steel 2 is welded to the bottom plate of the first channel steel 1, and the top end is welded to the horizontal steel plate 3. The steel bar 4 is welded on the top of the horizontal steel plate 3.

[0008] After the central drilling hole of the reinforcing steel plate 9 is aligned with the drilling hole of the first channel steel 1 , the reinforcing steel plate 9 is welded to the bottom plate of the first channel steel 1 around the periphery.

[0009] The beneficial effects of the utility model are:

[0010] The utility model can effectively prevent the circular tunnel bottom arch support device from displacement or sliding under load through the fastening device. At the same time, the steel plate 3 is horizontal, which can effectively ensure the stability of the steel pipe support and significantly improve the bearing capacity and safety stability of the overall device.

[0011] The device of the utility model has reasonable structural design, the required materials are relatively common in the market, the installation and disassembly are simple and quick, and the device can be reused after disassembly.

[0012] The utility model device can effectively reduce the damage to the surface of the original concrete bottom plate, the surface quality is good after the structure is formed, and the later repair cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural front view of the utility model.

[0014] Figure 2 for Figure 1 A partial top view of .

[0015] Figure 3 It is a cross-sectional view of the fastening device.

[0016] Figure 4 for Figure 3 Top view of the .

[0017] Meaning of symbols in the figure

[0018] Figure 1-4 In the middle: 1—the first channel steel, 2—the second channel steel, 3—the horizontal steel plate, 4—the vertical steel bar, 5—the fastening device, 6—the concrete base plate, 7—the connecting bolts, 8—the embedded screw rods, 9—the reinforcing steel plate, 10—the high-strength nuts, 11—the fastening bolts. DETAILED DESCRIPTION

[0019] A circular tunnel bottom arch support device, wherein the first channel steel 1 is a lower semicircular ring in a horizontal position, and both ends of its bottom plate are fixedly connected by fastening devices 5 and a concrete bottom plate 6 that is shaped like the fastening devices 5, and a plurality of vertically upward second channel steels 2 fixedly connected thereto are evenly distributed on the bottom plate between the two fastening devices 5, the upper ends of the second channel steels 2 are fixedly connected to the horizontal steel plate 3, and the vertical reinforcement 4 is fixedly connected to the upper surface of the horizontal steel plate 3. The fastening device 5 has embedded bolts 8 and connecting bolts 7 embedded in the concrete bottom plate. The upper end of the embedded bolt 8 is connected with the lower end of the connecting bolt 7 through internal threads. The lower end of the fastening bolt 11 is connected with the upper end of the connecting bolt 7 through internal threads. The fastening bolt 11 passes through the first channel steel 1, the reinforcing steel plate 9 and the high-strength nut 10. The reinforcing steel plate 9 is fastened by the high-strength nut 10 to fix the first channel steel 1 on the concrete bottom plate. The reinforcing steel plate 9 is welded to the first channel steel 1. The bottom end of the second channel steel 2 is welded to the bottom plate of the first channel steel 1, and the top end is welded to the horizontal steel plate 3. The top end of the horizontal steel plate 3 is welded to the steel bar 4. After the center drilling hole of the reinforcing steel plate 9 is aligned with the drilling hole of the first channel steel 1, the reinforcing steel plate 9 is welded to the bottom plate of the first channel steel 1 around.

[0020] The steps of making and installing this utility model are as follows:

[0021] 1. Fabrication of circular tunnel bottom arch support device

[0022] The first and second channel steels 1, 2, horizontal steel plate 3, vertical steel bar 4, and reinforcing steel plate 9 are processed and manufactured in the processing plant according to the size and shape of the design drawing. The center of the reinforcing steel plate 9 is drilled, and the first channel steel 1 is also drilled at the fastening position. The center drilled hole of the reinforcing steel plate 9 is aligned with the drilled hole of the first channel steel 1, and then welded and connected into a whole in the processing plant. The first channel steel 1 and the second channel steel 2, the second channel steel 2 and the horizontal steel plate 3, and the horizontal steel plate 3 and the vertical steel bar 4 are welded and connected into a whole on site. Among them, the first and second channel steels 1, 2 select the channel steel model according to the design requirements, the horizontal steel plate 3 and the reinforcing steel plate 9 are 12mm steel plates, and the vertical steel bar 4 is C18 round steel. The installation bolts 7, embedded screws 8, high-strength nuts 10, and fastening bolts 11 are purchased as finished products on the market according to demand. If there are no corresponding finished products on the market, they are processed in the processing plant according to the size of the design drawing.

[0023] The height and quality of all welds between the components of the circular tunnel bottom arch support device meet the design requirements to ensure that the welding is firm.

[0024] (II) Installation and removal of circular tunnel bottom arch support device

[0025] During the installation of the circular tunnel bottom arch support device, first, the embedded screw rod 8 is connected to the installation bolt 7 and then laid out and positioned according to the design position and embedded in the concrete bottom plate. After the bottom plate concrete is poured and the strength reaches the design or specification requirements, the device components processed in the processing plant are transported to the site by vehicle and manually carried to the working surface for installation. Then, the first channel steel 1 is drilled and aligned with the bolt hole of the installation bolt 7. After the fastening bolt 11 is passed through the drilled hole, the lower part of the fastening bolt 11 is connected to the installation bolt 7. The upper part of the fastening bolt 11 is fastened with a high-strength nut 10 to tighten the reinforcing steel plate 9 to fix the first channel steel 1 on the concrete bottom plate. Then, the second channel steel 2 is laid out and positioned according to the design position and then welded to the first channel steel 1. Then, the horizontal steel plate 3 is welded to the second channel steel 2, and the vertical steel bar 4 is welded to the horizontal steel plate 3. All the support systems are welded in sequence. After the first circular tunnel bottom arch support device is installed, the steps are repeated to install all circular tunnel bottom arch support devices. After all the devices are installed, the steel pipe support is put on the vertical steel bars 4 and placed on the horizontal steel plate 3, and finally the tunnel top arch concrete formwork support is erected.

[0026] The formwork support system and the circular tunnel bottom arch support device can only be removed after the concrete pouring is completed and the strength reaches the design or specification requirements. When removing the bottom arch support device, the channel steel 1 is disengaged from the concrete bottom plate by loosening the high-strength nut 10. The removed materials must be properly stored and must not be damaged. They must be circulated to the next warehouse for use or for later use.

Claims

1. The circular tunnel bottom arch support device is characterized by The first channel steel (1) is a lower semicircular ring in a horizontal position, and its two ends of the bottom plate are fixedly connected by a fastening device (5) and a concrete bottom plate (6) that is shaped like the fastening device (5). Between the two fastening devices, a plurality of vertically upward second channel steels (2) are evenly distributed and fixedly connected to the bottom plate of the first channel steel (1), the upper ends of the second channel steels are fixedly connected to the horizontal steel plate (3), and the lower ends of the vertical steel bars (4) are fixedly connected to the upper surface of the horizontal steel plate.

2. The circular tunnel bottom arch support device according to claim 1, characterized in that The fastening device (5) comprises an embedded bolt (8) and a connecting bolt (7) embedded in the concrete bottom plate, the upper end of the embedded bolt is connected to the lower end of the connecting bolt by an internal thread, the lower end of the fastening bolt (11) is connected to the upper end of the connecting bolt by an internal thread, the fastening bolt passes through the first channel steel, the reinforcing steel plate (9) and the high-strength nut (10), the reinforcing steel plate is welded to the first channel steel, the bottom end of the second channel steel is welded to the bottom plate of the first channel steel, the top end is welded to the horizontal steel plate, and the vertical steel bar is welded to the top of the horizontal steel plate.

3. The circular tunnel bottom arch support device according to claim 2, characterized in that: After the central drilling hole of the reinforcing steel plate (9) is aligned with the drilling hole of the first channel steel, the reinforcing steel plate is welded to the bottom plate of the first channel steel around its periphery.

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