Tunnel Center

Abstract

To provide a tunnel center capable of easily checking the pouring level of lining concrete on the left and right sides of a form on site without the need for laborious drawing of an indicator of the pouring level of the lining concrete with a spray or the like. [Solution] In a tunnel center equipped with a semicircular formwork 1 that forms a space S for pouring lining concrete between it and the tunnel inner wall surface T1, a plurality of floodlights 2 that emit point-like or linear light L extending in the longitudinal direction of the tunnel at predetermined intervals are provided on both sides of the outer periphery of the formwork 1 facing the tunnel inner wall surface T1, and the light L projected onto the tunnel inner wall surface T1 generates an indicator of the pouring level of the lining concrete on the tunnel inner wall surface T1.

Description

[Technical Field]

[0001] The present invention relates to a tunnel center, and more particularly to a tunnel center that allows easy confirmation of the pouring balance of lining concrete. [Background technology]

[0002] The tunnel center is equipped with a semicircular formwork that forms a pouring space for the lining concrete between it and the tunnel's inner wall, and if the amount of concrete poured into the pouring space differs on the left and right, the load from the concrete becomes unbalanced, causing the formwork to distort.On the other hand, for example, Patent Documents 1 and 2 propose a method of installing concrete sensors using optical sensors or proximity switches in the formwork to detect the pouring level of the lining concrete, which makes it possible to detect the pouring level of the concrete on the left and right sides of the pouring space and manage it so that it is equal on both sides. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2018-035632 [Patent Document 2] Patent Publication No. 2020-133369 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while the above-mentioned conventional concrete sensor uses detection signals output from the sensor that can be collected on a central monitor or the like for centralized management, there is a demand for a way to easily check the concrete pouring level on the left and right sides of the formwork from the formwork access point on-site. Conventionally, this has been achieved by spray-painting lines to indicate the concrete pouring level on the tunnel's inner wall or the waterproof sheet covering it, but this is a time-consuming task that requires the use of tunnel center scaffolding or aerial work vehicles.

[0005] Therefore, the present invention solves such problems and aims to provide a tunnel center that allows the pouring level of the lining concrete on the left and right sides of the formwork to be easily confirmed on site without the need to take the time to draw indicator lines for the pouring level. [Means for solving the problem]

[0006] In order to achieve the above object, in the first invention, in a tunnel center having a semicircular formwork (1) that forms a pouring space (S) for lining concrete between itself and a tunnel inner wall surface (T1), Inside the wall A plurality of light projecting means (2) are provided at predetermined intervals in the vertical direction of the tunnel to project linear light (L) extending in the longitudinal direction of the tunnel, and Floodlight The means (2) is rotatably supported by a support means (231) so as to maintain a horizontal position according to the inclination of the outer periphery of the formwork (1), and the light (L) projected onto the inner circumferential wall surface (T1) of the tunnel generates an indicator of the pouring level of the lining concrete on the inner circumferential wall surface (T1) of the tunnel.

[0007] In the first invention, Floodlight The linear light output from the means is projected onto the inner wall surface of the tunnel, and an indicator of the pouring level of the lining concrete is generated on the inner wall surface, so that the pouring level of the lining concrete on the left and right sides of the formwork can be easily confirmed on site without the need for the time and effort of drawing an indicator line of the pouring level with a spray, etc. as in the past. Floodlight Even if we provide the means, Floodlight The light can be emitted horizontally from the means at all times.

[0008] In the second aspect of the present invention, the light projecting means (2) are provided with light emitting means of different colors.

[0009] According to the second invention, the pouring level of the lining concrete can be checked even more easily.

[0010] In the third aspect of the present invention, the light projecting means (2) is provided so that a plurality of light projecting means with different luminous colors are alternately provided.

[0011] According to the third invention, the pouring level of the lining concrete can be easily confirmed even when the light-emitting color of the light-projecting means is limited.

[0012] In the fourth aspect of the present invention, the light projecting means (2) is also provided at a plurality of different positions in the longitudinal direction of the tunnel.

[0013] According to the fourth invention, the pouring level of the lining concrete can be reliably confirmed over the entire longitudinal area of ​​the formwork.

[0014] In the fifth invention, the light projecting means (2) is provided within the formwork (1) and emits the light (L) through a transmission window (16) provided on the outer periphery of the formwork (1).

[0015] According to the fifth aspect of the present invention, the light-projecting means can be housed within a formwork to protect it from the concrete being poured. In this case, by appropriately coloring the transmission window, the white light output from the light-projecting means can be changed to a different color, thereby achieving the same effects as the second and third aspects of the present invention.

[0018] The symbols in parentheses above indicate, for reference, the correspondence with specific means described in the embodiments to be described later. [Effects of the Invention]

[0019] As described above, according to the tunnel center of the present invention, the pouring level of the lining concrete on the left and right sides of the formwork can be easily confirmed on site without the need to take the time to draw level indicator lines. [Brief explanation of the drawings]

[0020] [Figure 1] This is a front view of the left half of the formwork of the tunnel center located inside the tunnel. [Figure 2] FIG. 2 is a vertical cross-sectional view of a floodlight installation portion. [Figure 3] FIG. 3 is a horizontal cross-sectional view taken along line III-III in FIG. 2. [Figure 4] This is a vertical cross-sectional view of the floodlight installation area where the skin plate of the formwork is nearly vertical. [Figure 5] This is a vertical cross-sectional view of the floodlight installation area where the skin plate of the formwork is inclined. [Figure 6] A vertical cross-sectional view of the floodlight installation area where the skin plate of the formwork is further inclined. DETAILED DESCRIPTION OF THE INVENTION

[0021] The embodiments described below are merely examples, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

[0022] Figure 1 shows a front view of the left half of the formwork 1 of the tunnel center located inside tunnel T. A pouring space S into which the secondary lining concrete (hereinafter simply referred to as lining concrete) is poured is formed between the outer surface of formwork 1 and the inner wall surface T1 of the primary lining concrete C that covers the inner surface of the tunnel. Note that formwork 1 is symmetrical and curved in a semicircular arc following the inner wall surface T1, and the following explanation will focus on the structure of the left half of formwork 1, but the right half has a similar structure.

[0023] The formwork 1 is composed of a top form 11 at the top, a side form 12 connected to the bottom end of the top form 11, and an invert form 13 connected to the bottom end of the side form 12. The top form 11 is supported on a mobile cart (gantry) (not shown) so that it can be raised and lowered, and the side form 12 and invert form 13 can be rotated inward and outward by extending and retracting a jack (not shown) installed between the mobile cart. The side form 12 and the top form 11 are provided with inspection hatches 14 that can be opened and closed at appropriate positions in the height direction, and these inspection hatches 14 are used to pour the lining concrete into the pouring space S and to check the pouring level of the poured lining concrete.

[0024] A plurality of floodlights 2 are provided at predetermined intervals in the vertical direction on the formwork 1 within a predetermined height range H on the periphery. Here, the predetermined height range H is a range within which it is desired to know the pouring level of the lining concrete poured in the pouring space S. Furthermore, such floodlights 2 are similarly provided at a plurality of positions at predetermined intervals in the vertical direction at different required positions on the formwork 1 in the longitudinal direction of the tunnel.

[0025] A detailed vertical cross-sectional view of the installation area for floodlight 2 is shown in Fig. 2, and its horizontal cross-sectional view is shown in Fig. 3. An opening is made in skin plate 15 that forms the surface of formwork 1 and is covered with a transparent acrylic plate to form transmission window 16. A base plate 21 of floodlight 2, which has an opening 211, is fixed with bolts to mounting seat 151 provided on the back surface of skin plate 15 around the transmission window 16, and a cover plate 22 that is bent into a U-shape is attached to said base plate 21.

[0026] A U-shaped bracket 231 (Fig. 3) is screwed to the back plate 221 of the cover plate 22, and a rectangular parallelepiped two-lamp parallel-connected LED lamp 23 is arranged facing the transmission window 16 so that the two lamps are at the same height, and is rotatably attached to the tip of the bracket 231. An example of an LED lamp 23 that can be suitably used is model LBL-9005 manufactured by Koito Manufacturing Co., Ltd. Light output from a pair of parallel-connected lamp bulbs 232 (Fig. 3) becomes a convergent linear beam of a certain length extending in the parallel direction, passes through the transmission window 16, and is emitted outside the skin plate 15 (to the left in Fig. 2).

[0027] 1, the surface of the formwork 1 is formed in an arc shape, and therefore the angle of the skin plate 15 is tilted more horizontally as it increases. Therefore, as shown in Figures 4 to 6, by appropriately rotating the LED lamp 23 on the support 231 in accordance with changes in the tilt angle of the skin plate 15 and maintaining a horizontal position, the focused linear light L output from the LED lamp 23 can always pass through the transmission window 16 horizontally.

[0028] 1, each of the projectors 2 is installed at a predetermined vertical interval within a predetermined height range H within the pouring space S, and is also installed at multiple different positions along the length of the tunnel. The projectors 2 each emit focused linear light L through a transmission window 16, and this focused linear light L is projected onto the tunnel inner wall surface T1 (and onto the surface of a waterproof sheet, if one is installed along the tunnel inner wall surface T1 to cover the inside of the tunnel). This creates multiple horizontal lines on the tunnel inner wall surface T1, each at the same height and extending along the length of the tunnel at different heights. In this way, an indicator of the pouring level of the lining concrete is generated on the tunnel inner wall surface T1.

[0029] When pouring the lining concrete, the above indicators can be checked by looking through an appropriate inspection hatch 14, and the pouring level of the lining concrete on the left and right sides of the formwork 1 can be easily confirmed on site, without the need to take the time to draw level indicator lines with a spray or the like as in the past.

[0030] The pouring level can be checked more easily if the focused linear light L output from the floodlight 2 has different luminous colors in the height direction. If the luminous colors of the floodlight 2 are limited, multiple different colors, such as red, green, and blue, or a combination of red and blue, may be used. If the transmission window 16 is appropriately colored, the same effect as above can be obtained even if the projector 2 emits white light. Furthermore, it is not necessary to use two LED lamps to generate a continuous linear indicator, and a dotted line using spot light may also be used. The floodlights 2 do not necessarily have to be provided at a plurality of different positions in the longitudinal direction of the tunnel, but may be provided at one position in the longitudinal direction. Furthermore, the projector 2 does not necessarily have to be installed inside the formwork 1 through the transmission window 16 . [Explanation of symbols]

[0031] 1...Formwork, 16...Transmission window, 2...Floodlight ( Floodlight means), 231...supporting device (supporting means), L...light, S...casting space, T...tunnel, T1...tunnel inner wall surface.

Claims

1. In a tunnel center having a semicircular formwork that forms a space between itself and the inner wall surface of a tunnel for pouring lining concrete, a plurality of light-projecting means are provided on the inside of both outer walls of the formwork that face the inner wall surface of the tunnel, at predetermined intervals in the vertical direction of the tunnel, and the light-projecting means are supported by a support means so that they can rotate to maintain a horizontal position according to the inclination of the outer periphery of the formwork, and an indicator of the pouring level of the lining concrete is generated on the inner wall surface of the tunnel center.

2. 2. A tunnel center according to claim 1, wherein said light projecting means are provided with light emitting means of different colors.

3. 2. The tunnel center according to claim 1, wherein the light projecting means is provided so that a plurality of light projecting means with different luminous colors are alternately provided.

4. 2. The tunnel center according to claim 1, wherein the light projecting means is provided at a plurality of different positions in the longitudinal direction of the tunnel.

5. 2. A tunnel center according to claim 1, wherein the light projecting means is provided within the formwork and emits the light through a transmission window provided on the outer periphery of the formwork.

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