Tunnel Center

Abstract

This tunnel centering tool allows for easy on-site confirmation of the concrete placement level on both sides of the formwork, without the need to manually mark the concrete placement level with spray paint or other methods. [Solution] In a tunnel centering system equipped with a semicircular formwork 1 that forms a space S for pouring lining concrete between itself and the inner circumferential wall surface T1 of the tunnel, a plurality of floodlights 2 are provided on the outer circumference of both sides of the formwork 1 facing the inner circumferential wall surface T1, emitting point-like or linear light L extending in the longitudinal direction of the tunnel at predetermined intervals in the vertical direction of the tunnel. The light L projected onto the inner circumferential wall surface T1 of the tunnel generates an indicator of the lining concrete pouring level on the inner circumferential wall surface T1 of the tunnel.

Description

Technical Field

[0001] The present invention relates to a tunnel centering, and particularly to a tunnel centering that can easily confirm the placing balance of the lining concrete.

Background Art

[0002] A tunnel centering has a semi-circular formwork that forms a placing space for lining concrete between the inner peripheral wall of the tunnel. If the amount of concrete placed in the placing space is different on the left and right, there is a problem that the load received from the concrete becomes unbalanced and the formwork is distorted. On the other hand, for example, in Patent Documents 1 and 2, a concrete sensor using an optical sensor or a proximity switch is provided on the formwork to detect the placing level of the lining concrete. According to this, it is possible to detect the placing levels of the concrete on the left and right in the placing space and manage them so that they are equal on the left and right.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of using the above conventional concrete sensor, although it is good for collecting the detection signals output from the sensor to a central monitor or the like for centralized management, there is a demand to easily confirm the concrete placing levels on the left and right of the formwork from the work openings of the formwork or the like at the site. Therefore, conventionally, a line indicating the placing level has been drawn by spraying on the inner peripheral wall of the tunnel or the waterproof sheet covering it, but this work is a laborious work that uses the scaffolding of the tunnel centering or an aerial work vehicle.

[0005] Therefore, the present invention aims to solve these problems by providing a tunnel centering device that allows for easy on-site confirmation of the concrete placement level of the lining concrete on both sides of the formwork without the need to draw indicator lines for the placement level. [Means for solving the problem]

[0006] To achieve the above objective, the first invention provides a tunnel centering system comprising a semicircular formwork (1) that forms a space (S) for pouring lining concrete between itself and the inner circumferential wall surface (T1) of the tunnel. The system is provided with a plurality of light projection means (2) on both outer circumferences of the formwork (1) facing the inner circumferential wall surface (T1), which emit point-like or linear light (L) extending in the longitudinal direction of the tunnel at predetermined intervals in the vertical direction of the tunnel. The light (L) projected onto the inner circumferential wall surface (T1) generates an indicator of the lining concrete pouring level on the inner circumferential wall surface (T1).

[0007] In this first invention, point-like or linear light output from a light-transmitting means provided in the formwork is projected onto the inner circumferential wall surface of the tunnel, generating an indicator of the concrete lining level on the inner circumferential wall surface. This eliminates the need to draw indicator lines for the concrete lining level using spray paint or the like, as in the conventional method, allowing for easy on-site confirmation of the concrete lining level on both sides of the formwork.

[0008] In this second invention, the light-emitting means (2) is provided with different light-emitting colors.

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

[0010] In this third invention, the light-emitting means (2) is provided in such a way that multiple different light-emitting colors are repeated.

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

[0012] In this fourth invention, the light-emitting means (2) is also provided at multiple different positions along the longitudinal direction of the tunnel.

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

[0014] In this fifth invention, the light-emitting means (2) is provided inside the formwork (1) and emits the light (L) through a transmissive window (16) provided on the outer circumference of the formwork (1).

[0015] According to the fifth invention, the light-emitting means can be housed within the formwork and protected from the concrete being poured. In this case, by appropriately coloring the translucent window, the white light output from the light-emitting means can be changed to a different color, and the same effects as those of the second and third inventions can be obtained.

[0016] In this sixth invention, the light-transmitting means (2) is supported by a support means (231) so as to be rotatable in accordance with the inclination of the outer circumference of the formwork (1) and maintain a horizontal position.

[0017] According to the sixth invention, regardless of the vertical position of the semi-circular curved formwork, the light-transmitting means can always emit light horizontally.

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

[0019] As described above, with the tunnel centering system of the present invention, the pouring level of the lining concrete on both sides of the formwork can be easily confirmed on-site without the need to draw level indicator lines. [Brief explanation of the drawing]

[0020] [Figure 1] This is a front view of the left half of the formwork for the tunnel centering structure located inside the tunnel. [Figure 2] It is a vertical cross-sectional view of the projector installation part. [Figure 3] It is a horizontal cross-sectional view taken along line III-III of FIG. 2. [Figure 4] It is a vertical cross-sectional view of the projector installation part at a location where the skin plate of the formwork is close to vertical. [Figure 5] It is a vertical cross-sectional view of the projector installation part at a location where the skin plate of the formwork is inclined. [Figure 6] It is a vertical cross-sectional view of the projector installation part at a location where the skin plate of the formwork is further inclined.

Embodiments for Carrying Out the Invention

[0021] Note that 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] FIG. 1 shows a front view of the left half of the formwork 1 of the tunnel center located inside the tunnel T. A placing space S for placing secondary lining concrete (hereinafter simply referred to as lining concrete) is formed between the outer peripheral surface of the formwork 1 and the inner peripheral wall surface T1 of the primary lining concrete C covering the inner peripheral surface of the tunnel. The formwork 1 is symmetric about the left and right and is curved in a semi-arc shape following the inner peripheral wall surface T1. The following description will explain the structure of the left half of the formwork 1, but the right half has the same structure.

[0023] Formwork 1 consists of a top surface form 11, a side form 12 connected to its lower end, and an invert form 13 connected to the lower end of the side form 12. The top surface form 11 is supported so as to be able to move up and down on a movable trolley (gantry) (not shown), and the side form 12 and invert form 13 can be rotated inward and outward by the extension and retraction of jacks (not shown) installed between the movable trolley. The side form 12 and the top surface form 11 are provided with inspection openings 14 that can be opened and closed at appropriate positions in the height direction, and these inspection openings 14 are used to pour lining concrete into the pouring space S and to check the pouring level of the poured lining concrete.

[0024] Multiple floodlights 2 are provided on the formwork 1 at predetermined intervals in the vertical direction within a predetermined height range H on its outer perimeter. Here, the predetermined height range H is the range within which the pouring level of the lining concrete poured into the pouring space S is to be determined. Similarly, multiple floodlights 2 are provided at predetermined intervals in the vertical direction at different required positions along the longitudinal direction of the tunnel on the formwork 1.

[0025] A detailed vertical cross-sectional view of the floodlight 2 installation area is shown in Figure 2, and a horizontal cross-sectional view thereof is shown in Figure 3. An opening is made in the skin plate 15 that constitutes the surface of the formwork 1, and this is covered with a transparent acrylic plate to form a transparent window 16. The base plate 21 of the floodlight 2, which has an opening 211, is bolted to a mounting seat 151 provided on the back surface of the skin plate 15 around the transparent window 16, and a U-shaped cover plate 22 is attached to the base plate 21.

[0026] A U-shaped support 231 (Figure 3) is screw-fastened to the back plate 221 of the cover plate 22, and two rectangular parallel LED lamps 23 are positioned opposite the translucent window 16 so that the two lamps are at the same height, and are rotatably attached to the tip of the support 231. Suitable LED lamps for this purpose include, for example, the LBL-9005 model manufactured by Koito Manufacturing Co., Ltd. The light emitted from the pair of parallel lamp bulbs 232 (Figure 3) becomes a focused linear light of a certain length extending in the parallel direction, passes through the translucent window 16, and is sent out to the outside of the skin plate 15 (to the left in Figure 2).

[0027] As shown in Figure 1, the surface of the formwork 1 is formed in an arc shape, so the angle of the skin plate 15 is inclined more horizontally at higher positions. Therefore, as shown in Figures 4 to 6, by appropriately rotating the LED lamp 23 on the support 231 in accordance with the change in the inclination angle of the skin plate 15 to maintain a horizontal position, the focused linear light L output from the LED lamp 23 is always made to pass through the transmissive window 16 horizontally.

[0028] As shown in Figure 1, focused linear light L is emitted from each of the floodlights 2, which are provided at predetermined intervals in the vertical direction within a predetermined height range H in the concrete placement space S and also at multiple different positions in the longitudinal direction of the tunnel, through the transmissive window 16. This focused linear light L is projected onto the inner perimeter wall surface T1 of the tunnel (and further onto the waterproof sheet surface if a waterproof sheet is provided along it and covering its interior), drawing multiple horizontal lines on the inner perimeter wall surface T1 that extend at the same height in the longitudinal direction of the tunnel at different height positions. In this way, an indicator of the concrete lining placement level is generated on the inner perimeter wall surface T1 of the tunnel.

[0029] When pouring the lining concrete, the pouring level of the lining concrete on both sides of the formwork 1 can be easily checked on-site by looking at the above indicators through the appropriate inspection openings 14, without the need to draw level indicator lines with spray paint or the like as in the past.

[0030] If the focused linear light L emitted from the floodlight 2 is of different colors in the height direction, it becomes even easier to confirm the concrete pouring level. If the floodlight 2 has a limited range of colors, multiple different colors may be used, for example, red, green, blue, or a repeating pattern of red and blue. Furthermore, by appropriately coloring the translucent window 16, the same effect as described above can be obtained even if the floodlight 2 is a white light source. Furthermore, it is not necessarily required to use two LED lamps to generate a continuous linear indicator; a dotted line using spotlighting would also suffice. Floodlight 2 does not necessarily need to be installed at multiple different locations along the length of the tunnel; it can be installed at just one location along the length. Furthermore, the floodlight 2 does not necessarily have to be installed inside the formwork 1 via the transparent window 16. [Explanation of Symbols]

[0031] 1...Formwork, 16...Transparent window, 2...Floodlight (light-transmitting means), 231...Support (support means), L...Light, S...Concrete casting space, T...Tunnel, T1...Inner perimeter wall surface of the tunnel.

Claims

1. A tunnel centering device comprising a semicircular formwork that forms a space for pouring lining concrete between itself and the inner circumferential wall surface of a tunnel, wherein a plurality of light projection means are provided on the outer circumference of both sides of the formwork facing the inner circumferential wall surface of the tunnel, emitting point-like or linear light extending in the longitudinal direction of the tunnel at predetermined intervals in the vertical direction of the tunnel, and the light projected onto the inner circumferential wall surface of the tunnel generates an indicator of the lining concrete pouring level on the inner circumferential wall surface of the tunnel.

2. The tunnel centering according to claim 1, wherein the light-emitting means are provided with different light-emitting colors.

3. The tunnel centering according to claim 1, wherein the light-transmitting means is provided in a repeating manner with a plurality of different light-emitting colors.

4. The tunnel centering according to claim 1, wherein the light-emitting means is also provided at multiple different positions in the longitudinal direction of the tunnel.

5. The tunnel centering according to claim 1, wherein the light-emitting means is provided within the formwork and emits light through a transmissive window provided on the outer circumference of the formwork.

6. The tunnel centering according to claim 1, wherein the light-transmitting means is supported by a support means so as to be rotatable in accordance with the inclination of the outer circumference of the formwork, so as to maintain a horizontal position.

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