Tunnel form for arch concrete

Abstract

To provide a tunnel form for arch concrete that allows sufficient monitoring and vibrator operation from an inspection port when feeding concrete into a concrete casting space.SOLUTION: A concrete casting space S, of which one end S1 is closed by the end Ch1 of existing secondary lining concrete Ch and the outer circumferential end 111 of the tunnel form for arch concrete 1, is formed with the tunnel inner periphery T1, and a concrete feeding port 21 opening into the concrete casting space S is provided on the top of the outer periphery 112 of the tunnel form for arch concrete 1, at a distance from the end S1 toward the other end of the concrete casting space S, and an inspection port 22 is provided on the top of the outer periphery 112 of the tunnel form for arch concrete 1, at a distance from the concrete feeding port 21 toward the other end of the concrete casting space S, and an air tube 3 is provided as a dam member on the top of the outer periphery 111 of the tunnel form for arch concrete 1 between the concrete feeding port 21 and the inspection port 22, which can advance outward toward the tunnel inner periphery T1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tunnel center, and more particularly to a tunnel center having a concrete supply port and an inspection port on the outer periphery that open into a concrete pouring space. [Background technology]

[0002] 16 shows an enlarged vertical cross section of the outer periphery of the tunnel center 1, with the outer peripheral end 111 on the wellhead side of the formwork 11 of the tunnel center 1 coming into contact with the face-side end Ch1 of the existing secondary lining concrete, thereby forming a concrete pouring space S between the tunnel inner periphery T1 and one end S1 on the wellhead side closed. A concrete supply port 21 of the concrete supply pipe 2 opens at the top of the outer peripheral surface 112 of the formwork 11 facing the concrete pouring space S, at a position away from the one end S1 towards the other end on the face side. An inspection hatch 22 is provided at a position further away from the concrete supply port 21 towards the face side. Patent Document 1 shows the use of an airbag to stop water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 5-148885 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional tunnel center 1 described above, when concrete Cn is supplied into the concrete pouring space S from the concrete supply port 21 as shown in Figure 16, the supplied concrete Cn often does not sufficiently fill one end S1 of the concrete pouring space S near the end Ch1 of the existing secondary lining concrete Ch, creating a cavity ho. To monitor this and to insert a vibrator Vb into the supplied concrete Cn to ensure sufficient filling and compaction, a worker M must look into the concrete pouring space S through the inspection hatch 22. However, because the supplied uncompacted concrete Cn also flows toward the inspection hatch 22, it was necessary to close the inspection hatch 22 without sufficient monitoring or operation of the vibrator Vb.

[0005] Therefore, the present invention aims to solve such problems and to provide a tunnel center that allows sufficient monitoring and vibrator operation from an inspection hatch when supplying concrete into the concrete pouring space. [Means for solving the problem]

[0006] In order to achieve the above object, in the present invention, a concrete pouring space (S) having one end (S1) closed by an end (Ch1) of an existing secondary lining concrete (Ch) and an outer peripheral end (111) of a tunnel center (1) is formed between the end (Ch1) of the existing secondary lining concrete (Ch) and the tunnel inner periphery (T1), and a concrete supply port (21) opening into the concrete pouring space (S) is provided on the outer periphery of the tunnel center (1) at a distance from the one end (S1) toward the other end of the concrete pouring space (S). An inspection hatch (22) is provided at the top of the outer periphery (111) of the tunnel center (1) at a distance from the concrete supply port (21) toward the other end of the concrete pouring space (S), and weir members (3, 3A, 3B, 3C, 5, 6) are provided at the top of the outer periphery (111) of the tunnel center (1) between the concrete supply port (21) and the inspection hatch (22) so as to be able to advance outward toward the inner periphery (T1) of the tunnel.

[0007] In the present invention, even when concrete is supplied from the concrete supply port into the concrete pouring space, the supplied concrete is blocked by the weir member and prevented from flowing toward the inspection hatch. Therefore, a worker looking out from the inspection hatch can observe the condition of the supplied concrete from above the weir member or through a gap formed in the weir member itself, and if necessary, can insert a vibrator into the supplied concrete through the gap to promote filling of the concrete at one end of the concrete pouring space.

[0008] In a preferred embodiment, the weir member is an air tube (3, 6) that advances a predetermined distance toward the inner periphery (T1) of the tunnel when inflated.

[0009] In a more preferred embodiment, a plurality of the air tubes (3A, 3B) are stacked, and the uppermost air tube (3B) is pressed against the inner periphery (T1) of the tunnel.

[0010] In another preferred embodiment, a pair of uppermost air tubes (3C) are provided, each shorter than half the length of the lower air tube (3A), and the uppermost air tubes (3C) of the pair are stacked on both ends of the lower air tube (3A), forming a gap (G) between the pair of uppermost air tubes (3C) and the inner circumference (T1) of the tunnel.

[0011] In yet another preferred embodiment, both end portions (62) of the air tube (6) are shaped so that when inflated, they extend farther outward toward the inner periphery of the tunnel than the middle portion (61) of the air tube (6) and press against the inner periphery of the tunnel.

[0012] In another preferred embodiment, the weir member is a weir plate (5) that extends a predetermined distance from inside the tunnel center (1) toward the tunnel inner periphery (T1) on the outside.

[0013] Furthermore, if the above-mentioned dam member is an air tube, it does not need to be manufactured, sold, transferred, etc. as a single unit with the tunnel center, but can be manufactured, sold, transferred, etc. as a separate dam member for the tunnel center equipped with an air vent valve, etc.

[0014] 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]

[0015] As described above, the tunnel center of the present invention equipped with a weir member allows for sufficient monitoring and vibrator operation from the inspection hatch when supplying concrete into the concrete pouring space. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is an enlarged vertical cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member in a first embodiment of the present invention. [Figure 2] FIG. 10 is an enlarged cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member. [Figure 3] 10 is an enlarged vertical cross section of the outer periphery of a tunnel center provided with an air tube as a dam member in a second embodiment of the present invention. [Figure 4] FIG. 10 is an enlarged cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member. [Figure 5] 10 is an enlarged vertical cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member in a third embodiment of the present invention. [Figure 6] FIG. 10 is an enlarged cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member. [Figure 7] 10 is an enlarged vertical cross section of the outer periphery of a tunnel center provided with an air tube as a dam member in a fourth embodiment of the present invention. [Figure 8] FIG. 10 is an enlarged cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member. [Figure 9] 10 is an enlarged vertical cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member in a fifth embodiment of the present invention. [Figure 10] FIG. 10 is an enlarged cross-sectional view of the outer periphery of a tunnel center provided with an air tube as a dam member. [Figure 11] FIG. 2 is a side view of the air tube in a deflated state. [Figure 12] FIG. 2 is a plan view of the air tube in a deflated state. [Figure 13] FIG. 2 is a side view of the air tube in an inflated state. [Figure 14] 10 is an enlarged vertical cross section of the outer periphery of a tunnel center provided with a dam plate as a dam member in a sixth embodiment of the present invention. [Figure 15] This is an enlarged cross-sectional view of the outer periphery of a tunnel center provided with a dam plate as a dam member. [Figure 16] This is an enlarged vertical cross section of the outer periphery of a conventional tunnel center. DETAILED DESCRIPTION OF THE INVENTION

[0017] 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.

[0018] (First embodiment) Fig. 1 shows an enlarged longitudinal section of the outer periphery of the tunnel center, and Fig. 2 shows an enlarged cross-section of the outer periphery of the tunnel center. In Fig. 1, the outer peripheral end 111 on the portal side of the formwork 11 of the tunnel center 1 contacts the face-side end Ch1 of the existing secondary lining concrete Ch, thereby forming a concrete pouring space S between the tunnel inner periphery T1 and one end S1 on the portal side, which is closed. A concrete supply port 21 of the concrete supply pipe 2 opens at the top of the outer periphery 112 of the formwork 11 facing the concrete pouring space S, at a position away from the one end S1 toward the other end on the face side. An inspection hatch 22 is provided at a position further away from the concrete supply port 21 toward the face side.

[0019] In this embodiment, an air tube 3 serving as a dam member is provided between the concrete supply port 21 and the inspection hatch 22. The air tube 3 is a long cylinder, for example, about 1500 mm long, and is provided so as to extend in the width direction along the outer periphery 112 of the formwork 11 (FIG. 2), and extends to both sides of the inspection hatch 22 in approximately the same length, with the inspection hatch 22 in the center, at a position forward (toward the entrance of the tunnel). An air supply pipe 31 leading to an air pump (not shown) is connected to the air tube 3.

[0020] When compressed air is supplied to the air tube 3 from the air pump, its cross section expands from a flat, deflated state to a circular shape as shown in Figure 1, and the air tube 3 is advanced outward from the outer periphery 112 of the formwork 11 toward the tunnel inner periphery T1. The height of the advanced air tube 3 at this time (i.e., the outer diameter of the air tube 3) is set to a height that allows a worker M sticking his head out from the inspection hatch 22 to check the condition of the concrete Cn being supplied from the concrete supply port 21 into the concrete pouring space S, and also creates a gap G between the air tube 3 and the tunnel inner periphery T1 that is large enough to allow a vibrator Vb to be inserted into the supplied concrete Cn.

[0021] In this embodiment, stopper plates 4 that can advance from within the formwork 11 into the concrete pouring space S are provided behind both sides of the air tube 3, and the back of the air tube 3 abuts against the advanced stopper plates 4. If necessary, the air tube 3 is also moored to the stopper plates 4 to prevent it from shifting position due to the pressure or buoyancy of the supplied concrete Cn.

[0022] In this structure, when concrete Cn is supplied into the concrete pouring space S from the concrete supply port 21 as shown in Figure 1, the supplied concrete Cn is blocked by the air tube 3 and prevented from flowing in the direction of the inspection hatch 22. A worker M sticks his head out of the inspection hatch 22 and observes the condition of the supplied concrete Cn through the gap G that appears above the air tube 3, and if necessary, can insert a vibrator Vb into the supplied concrete Cn through the gap G to promote the filling of the concrete Cn.

[0023] After confirming that the concrete Cn has been sufficiently filled near the end Ch1 of the existing secondary lining concrete Ch, the air tube 3 is released and the stopper plate 4 is pulled into the formwork 11. The air is released from the air tube 3, causing it to contract and be housed in the formwork 11 through the inspection hatch 22, and the door of the inspection hatch 22 is closed. During this time, the fluidity of the concrete Cn, which has been compacted by the vibrator Vb, has decreased, so even if the air tube 3 is contracted and removed, the concrete Cn will not enter the inspection hatch 22.

[0024] (Second embodiment) In this embodiment, as shown in Figures 3 and 4, air tubes 3A and 3B similar to those described in the first embodiment are stacked in two tiers, one above the other, and inflated into a circular shape, with the outer surface of the upper air tube 3B pressed against the inner periphery T1 of the tunnel. As a result, the two tiers of air tubes 3A and 3B are sandwiched between the outer periphery 112 of the formwork 11 and the inner periphery T1 of the tunnel, and the air tubes are positioned without displacement against the pressure and buoyancy of the concrete supplied from the concrete supply port into the casting space. The rest of the structure is the same as in the first embodiment.

[0025] If a cylindrical pipe is placed in the longitudinal center of the air tubes 3A, 3B before inflating them, and then both air tubes 3A, 3B are inflated, a circular peephole H (Fig. 4) will be formed in the center. This peephole H allows a worker M to look out from the inspection hatch 22 and observe the condition of the supplied concrete Cn (Fig. 3), and if necessary, he can insert a vibrator Vb into the supplied concrete Cn through the peephole H to promote the filling of the concrete Cn.

[0026] Each of the air tubes 3A, 3B used in this embodiment may be shaped so that a semicircular recess 32 is formed on the central side surface in the longitudinal direction when inflated, and the semicircular recesses 32 may be stacked facing each other to form a circular peephole H in the center, as shown in Fig. 4. In this embodiment, the peephole H does not necessarily have to be circular.

[0027] (Third embodiment) In this embodiment, as shown in Figures 5 and 6, a stopper plate 4 similar to that described in the first embodiment is provided behind the air tubes 3A, 3B stacked in two tiers, and the backs of the air tubes 3A, 3B abut against this stopper plate 4. The other structures are the same as those of the second embodiment.

[0028] According to this structure, the air tubes 3A, 3B can be positioned more reliably without being displaced against the pressure and buoyancy of the supplied concrete Cn. The air tubes are not limited to two-tiered arrangement, but may be three or more tiered.

[0029] (Fourth embodiment) This embodiment is shown in Figures 7 and 8. In this embodiment, small air tubes 3C are stacked on both ends of the air tube 3A, and the outer peripheries of these air tubes 3C are pressed against the inner periphery T1 of the tunnel. This allows the entire air tubes 3A and 3C to be positioned without displacement against the pressure and buoyancy of the concrete Cn supplied from the concrete supply port 21 into the casting space S. The other structures are the same as those of the first embodiment.

[0030] According to the structure of this embodiment, a gap G is created between the center of the air tube 3A and the tunnel inner circumference T1, so that a worker M sticking his head out from the inspection hatch 22 can observe the condition of the supplied concrete Cn through the gap G, and if necessary, can insert a vibrator Vb into the supplied concrete Cn through the gap G to promote filling of the concrete Cn.

[0031] (Fifth embodiment) This embodiment is shown in Figures 9 and 10. In this embodiment, an air tube 6 serving as a weir member is also installed between the concrete supply port 21 and the inspection hatch 22, as in the previous embodiments. When the air tube 6 is inflated, its two ends 62, which are folded back and overlap the middle section 61, are pressed against the tunnel inner circumference T1. This positioning ensures that the air tube 6 is positioned without shifting against the pressure and buoyancy of the concrete Cn supplied from the concrete supply port 21 into the casting space S. A worker M peeking out from the inspection hatch 22 can observe the condition of the supplied concrete Cn through the gap G formed between the tunnel inner circumference T1 and the middle section 61. If necessary, the worker M can insert a vibrator Vb through the gap G into the supplied concrete Cn to expedite the filling of the concrete Cn. The remaining structure is the same as that of the first embodiment.

[0032] 11 to 13 show the details of the air tube 6. Fig. 11 is a side view of the air tube 6 in a deflated state, and Fig. 12 is a plan view thereof. The air tube in a deflated state is a flat, long rectangular body of a constant width, and both end portions 62 thereof are folded back onto a middle portion 61. An air supply pipe 63 for supplying compressed air is connected to the center of the side surface of the middle portion 61.

[0033] When compressed air is supplied from the air supply pipe 63, the air tube 6 expands, and the long middle section 61 extends into a plate shape of a predetermined thickness as shown in Figure 13, and at the same time, the folded end sections 62 advance upward and expand to a predetermined thickness while overlapping on the middle section 61. If the air supply pipes 63 can be connected to the end sections 62 as well so that air is supplied to the middle section 61 at the same time, the end sections 62 can be expanded quickly.

[0034] Such an air tube 6 is installed in a deflated state at a predetermined position on the outer periphery 112 of the formwork of the tunnel center 1 from the inspection hatch 22, and by supplying compressed air to it and causing it to expand, it functions as a dam member between the concrete supply port 21 and the inspection hatch 22 as shown in Figure 9.

[0035] (Sixth embodiment) In this embodiment, unlike the above-described embodiments, a dam plate 5 is provided as a dam member, as shown in Figures 14 and 15. In Figure 14, a dam plate 5 is provided between a concrete supply port 21 and an inspection hatch 22 provided at the top of a formwork 11 of a tunnel center 1, with its upper end 51 extending a required amount from within the formwork 11 into the concrete pouring space S.

[0036] The dam plate 5 is a rectangular plate as shown in Figure 15, and has a width greater than that of the inspection hatch 22. A drive cylinder 52 is provided inside the formwork 11 facing downward, and the tip of its rod 521 is connected to the center of the lower edge of the dam plate 5. As a result, when the rod 521 of the drive cylinder 52 is contracted, the dam plate 5 is raised as shown in the figures, and its upper end 51 is advanced into the concrete pouring space S. The rest of the structure is the same as in the first embodiment.

[0037] The concrete Cn supplied from the concrete supply port 21 into the concrete pouring space S is blocked by the dam plate 5 extending into the concrete pouring space S, and is prevented from flowing in the direction of the inspection hatch 22. A worker peeking out from the inspection hatch 22 can observe the condition of the supplied concrete Cn through the gap G that has formed above the dam plate 5, and, if necessary, can insert a vibrator through the gap G into the supplied concrete Cn to promote the filling of the concrete Cn.

[0038] After confirming that the concrete Cn has been sufficiently filled, the rod 521 of the drive cylinder 52 is extended to retract the dam board 5 into the formwork 11 until its upper end 51 is flush with the outer periphery of the formwork 11 and store it therein.

[0039] (Other embodiments) In each of the above embodiments, the cross-sectional shape of the air tube does not necessarily have to be circular. In the fifth embodiment, both ends that are folded over the middle section in a deflated state can be secured with hook-and-loop fasteners or the like. The fastening by hook-and-loop fasteners is automatically released when the tube is deformed by inflation. Note that both ends of the air tube do not necessarily have to be folded over the middle section; for example, both ends may be formed into a shape that protrudes from the tube body and then inflated. [Explanation of symbols]

[0040] 1...tunnel center, 11...formwork, 111...outer peripheral end of tunnel center, 112...outer peripheral of tunnel center, 21...concrete supply port, 22...inspection hatch, 3, 3A, 3B, 3C...air tube (dam member), 5...dam plate (dam member), 6...air tube, 61...middle part, 62...end, Ch...existing secondary lining concrete, Ch1...end of existing secondary lining concrete, Cn...supplied concrete, S...concrete pouring space, S1...one end of concrete pouring space, T1...inner periphery of tunnel.

Claims

1. A concrete pouring space, one end of which is closed by the end of the existing secondary lining concrete and the outer end of the tunnel center, is formed between the inner circumference of the tunnel, and a concrete supply port, which opens into the concrete pouring space, is provided at the outer periphery of the tunnel center, spaced from the one end toward the other end of the concrete pouring space, and an inspection hatch is provided at the outer periphery of the tunnel center, spaced from the concrete supply port toward the other end of the concrete pouring space, and a dam member, which can advance outward toward the inner circumference of the tunnel, is provided at the outer periphery of the tunnel center between the concrete supply port and the inspection hatch.

2. 2. A tunnel center according to claim 1, wherein the weir member is an air tube that advances outward toward the inner periphery of the tunnel by a predetermined amount when inflated.

3. 3. The tunnel center according to claim 2, wherein a plurality of the air tubes are stacked, and the uppermost air tube is pressed against the inner periphery of the tunnel.

4. 4. A tunnel center as described in claim 3, wherein a pair of uppermost air tubes are provided, each shorter than half the length of the lower air tube, and the pair of uppermost air tubes are stacked on both ends of the lower air tube, respectively, to form a gap between the pair of uppermost air tubes and the inner circumference of the tunnel.

5. 3. A tunnel center according to claim 2, wherein both ends of the air tube are shaped so that when inflated, they extend farther outward toward the inner periphery of the tunnel than the middle portion of the air tube and press against the inner periphery of the tunnel.

6. 2. The tunnel center according to claim 1, wherein the weir member is a weir plate that extends outward from the inside of the tunnel center toward the inner periphery of the tunnel by a predetermined amount.

7. A dam member for a tunnel center that is installed on the outer periphery of a tunnel center between a concrete supply port and an inspection port, the dam member being constructed from an air tube, and both ends of the air tube being shaped so that when expanded, they can advance further than the middle part of the air tube and be pressed against the inner periphery of the tunnel.

8. A tunnel center dam member as described in claim 7, wherein both end portions of the air tube are folded onto the middle portion, and when inflated, both end portions are overlapped onto the middle portion of the air tube and can expand and advance to be pressed against the inner circumference of the tunnel.

9. A dam member used in a tunnel center in which a concrete pouring space, one end of which is closed by the end of the existing secondary lining concrete and the outer circumferential end of the tunnel center, is formed between the inner periphery of the tunnel, and a concrete supply port opening into the concrete pouring space is provided at the outer periphery of the tunnel center at a distance from the one end toward the other end of the concrete pouring space, and an inspection hatch is provided at the outer periphery of the tunnel center at a distance from the concrete supply port toward the other end of the concrete pouring space, and the dam member for the tunnel center is composed of an air tube that is installed at the outer periphery of the tunnel center between the concrete supply port and the inspection hatch and can advance outward a predetermined amount toward the inner periphery of the tunnel when it expands.

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