End plate device for tunnel arch

Abstract

To provide an end plate device for a tunnel arch capable of greatly reducing the labor required for installing an end plate.SOLUTION: An end plate device 1 is installed at an end 53 of a formwork outer periphery 5 of a tunnel arch and defines a pouring space S for lining concrete between the formwork outer periphery 5 and a tunnel inner periphery T1, and comprises a retaining member 2 that is attached to the end 53 of the formwork outer periphery 5 and extends in the circumferential direction, and rectangular rods 3 and 4 that are held by the retaining member 2 and are arranged to be adjacent to each other so as to be able to move independently in the longitudinal direction. The rectangular rods 3 and 4 are advanced toward and abut against the tunnel inner periphery T1 to define the pouring space S.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a tunnel end plate device that defines a space for pouring lining concrete between the outer periphery of a tunnel center formwork and the inner periphery of a tunnel. [Background technology]

[0002] When forming a space for pouring secondary lining concrete between the outer periphery of the tunnel center formwork and the inner periphery of the tunnel, the entrance side of the pouring space is closed by the edge of the outer periphery of the formwork overlapping the inner periphery of the existing lining concrete, while the face side is closed by installing a side plate 9 as shown in Figure 13. The side plate 9 is generally made of a wide plate material, and such side plate 9 is inserted from the inside (bottom in Figure 13) between a side plate stopper 91 installed at the end of the formwork and then fixed by inserting a camber 92 between the side plate stopper 91. This type of structure is shown in Figure 5 of Patent Document 1. Furthermore, if necessary, a burr support 93 is installed between the end plate 9 and a support (not shown) installed at the end of the formwork 53 to support the back of the end plate 9 against the pressure of the concrete poured into the pouring space S. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2015-151774 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with conventional wide end plates, since the unevenness of the excavated surface appears on the inside of the tunnel after the first lining, it is necessary to check the excavation cross section each time and cut the end plate to a shape that matches the uneven cross section of the tunnel's inner periphery, which requires a great deal of labor. This problem becomes even more severe when burr catchers are used.

[0005] Therefore, the present invention is intended to solve such problems, and aims to provide a tunnel center end plate device that can significantly reduce the labor required to install end plates. [Means for solving the problem]

[0006] In order to solve the above problems, the first invention provides a gable plate device (1) that is installed at the end (53) of the formwork outer periphery (5) of a tunnel center and that defines and forms a pouring space (S) for lining concrete between the formwork outer periphery (5) and the tunnel inner periphery (T1), and that includes a retaining member (2) that is provided at the end (53) of the formwork outer periphery (5) and extends in the circumferential direction, and rectangular rod bodies (3, 4) that are held by the retaining member (2) and are provided adjacent to each other so that they can move independently of each other in the longitudinal direction, and each rectangular rod body (3, 4) advances toward and abuts against the tunnel inner periphery (T1) to define and form the pouring space (S).

[0007] According to the first invention, by appropriately advancing adjacent rectangular rods until their tips abut the inner surface of the tunnel, an end plate is formed that has a shape that follows the uneven cross-section of the tunnel's inner surface as a whole, eliminating the need to cut the tips of wide end plates as in the conventional method, and significantly reducing the effort required to install the end plates.

[0008] In the second aspect of the present invention, there are provided restricting members (31, 41) that allow adjacent rectangular rods (3, 4) to move independently in the longitudinal direction while restricting their mutual displacement in a direction perpendicular to the longitudinal direction.

[0009] According to the second invention, mutual shifting in the direction perpendicular to the longitudinal direction is reliably restricted, eliminating the need to install a burr support material to support the back of the end board as in the conventional method, further reducing the effort required to install the end board.

[0010] In the third aspect of the present invention, each of the rectangular rods 6 is formed into a shape that restricts its displacement in a direction perpendicular to its longitudinal direction. More specifically, for example, each of the rectangular rods 6 is formed by connecting a plurality of identical members 62, 63, 64 having convex portions 621, 631, 641 and concave portions 622, 632, 642 that restrict its displacement in a direction perpendicular to its longitudinal direction by fitting the convex portions 621, 631, 641 and concave portions 622, 632, 642 together in the longitudinal direction.

[0011] According to the third invention, the same effects as those of the second invention can be obtained.

[0012] In the fourth invention, adjacent rectangular rods (3, 4) are formed with long holes (32, 42) that penetrate through them and extend in the longitudinal direction, and a retaining plate (23) with a width shorter than the length of the long hole (32, 42) is installed and penetrates the long hole (32, 42).

[0013] According to the fourth invention, the retaining plate ensures the amount of movement of the rectangular rod body in the longitudinal direction while reliably restricting any shifting movement in a direction perpendicular to the longitudinal direction, thereby eliminating the need to install a burr support material to support the back of the end plate as in the conventional method, further reducing the effort required to install the end plate.

[0014] In the fifth aspect of the present invention, roller bodies (10) are provided whose outer circumferential surfaces are in sliding contact with the side surfaces of the rectangular rod bodies (3, 4) to advance them toward the tunnel inner circumferential surface (T1).

[0015] According to the fifth invention, when the roller body is rotated, the frictional force causes the multiple rectangular rods to advance simultaneously toward the tunnel's inner circumferential surface. Because the rectangular rods advance due to the frictional force between the outer surface of the rotating roller body and the rectangular rods, those that reach the tunnel's inner circumferential surface first stop there, and only those that have not yet reached the tunnel's inner circumferential surface advance further, pushing each rectangular rod into a shape that matches the uneven cross-section of the tunnel's inner circumferential surface. Because the rectangular rods can be advanced simultaneously, the installation work is shortened.

[0016] In the sixth aspect of the present invention, a driving means (8) is provided for moving the holding member (7) in a direction away from the end (53) of the outer periphery (5) of the formwork.

[0017] According to the sixth aspect of the present invention, by moving the holding member in a direction away from the edge of the outer periphery of the formwork, the rectangular bar can be easily peeled off from the end face of the poured concrete.

[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, the tunnel center end plate device of the present invention can significantly reduce the labor required to install the end plate. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 2 is a partial front view of the face side end of the outer periphery of the formwork of the tunnel center in the first embodiment of the present invention, where a side plate device is provided. [Figure 2] FIG. [Figure 3] 1A and 1B are front and side views of a rectangular rod body. [Figure 4] 1A and 1B are front and side views of a rectangular rod body. [Figure 5] FIG. 3 is a cross-sectional view taken along line VV in FIG. 2. [Figure 6] FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. [Figure 7] 10 is a cross-sectional view of the face-side end of the outer periphery of a formwork of a tunnel center, equipped with an end plate device according to a second embodiment of the present invention. FIG. [Figure 8] This is a cross-sectional view of the face side end of the outer periphery of the formwork of a tunnel center equipped with a side plate device. [Figure 9] FIG. 10 is an enlarged longitudinal sectional view of a part of a rectangular rod according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a front view of an end plate device according to a fourth embodiment of the present invention. [Figure 11] This is a cross-sectional view of the face side end of the outer periphery of the formwork of a tunnel center equipped with a side plate device. [Figure 12] FIG. 2 is a front view of the end plate device when the end plate device is in operation. [Figure 13] This is a cross-sectional view of the face-side end of the outer periphery of a tunnel center formwork equipped with a conventional end plate. 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] (First embodiment) 1 shows a partial front view of the face-side end 53 of the outer periphery of the formwork of the tunnel center. The face-side end 53 is arc-shaped along the inner periphery of the excavated tunnel T, and a plurality of end plate devices 1A, 1B, and 1C, which will be described in detail below, are installed at intervals around the circumferential direction of the face-side end 53.

[0023] Each end plate device 1A-1C has substantially the same structure, and the end plate device 1 shown in Fig. 2 comprises a retaining member 2 and a plurality of rectangular rods 3, 4 of a certain length that are held by the retaining member 2 and extend in the transverse direction (the perpendicular direction in this embodiment). In this embodiment, the rectangular rods 3, 4 are square rods, and their width dimensions are set so that when their end faces abut against the inner circumferential surface of the tunnel as described below, the gap with respect to the uneven cross section is within the allowable limit. Two types of rectangular rods 3, 4 are prepared as shown in Figs. 3 and 4, and these are held alternately adjacent to each other by the retaining member 2 (Fig. 2).

[0024] In the rectangular rod 3 shown in Fig. 3(1) in front view and Fig. 3(2) in side view, longitudinally extending grooves 31 are formed on the left and right side surfaces of the upper half of the tip, and a long hole 32 is formed in the lower half of the base end, penetrating to the left and right side surfaces. On the other hand, in the rectangular rod 4 shown in Fig. 4(1) in front view and Fig. 4(2) in side view, a long hole 42 of the same shape and position as the rectangular rod 42 is formed in the lower half of the base end, and a pin 41 is installed in one location on the upper half of the tip, penetrating in the width direction, with both ends of the pin 41 protruding from the left and right side surfaces. In such rectangular rods 3, 4, as shown in Fig. 2, both ends of the protruding pin 41 of the rectangular rod 4 enter and engage with the grooves 31 of the adjacent rectangular rod 3, restricting the upper half of the tips of the adjacent rectangular rods 3, 4 from shifting in a direction perpendicular to the longitudinal direction (a direction perpendicular to the plane of Fig. 2).

[0025] As shown in Figures 5 and 6, the retaining member 2 is equipped with an L-shaped angle bar 21 that clamps the square bars 3 and 4 between it and the face-side end 53 of the formwork periphery 5. Bolts 22 are inserted into through holes provided on both ends of the angle bar 21, and the bolts 22 are screwed, via spacers, into weld nuts 52 provided on the frame 51 at the face-side end 53, thereby holding the square bars 3 and 4 with an appropriate tightening force so that they can move in their longitudinal direction.

[0026] A retaining plate 23 having a width shorter than the length of the elongated holes 32, 42 of the rectangular rods 3, 4 (approximately half the length of the hole in this embodiment) is installed through the holes, and both end plate surfaces are positioned between parallel plates 241 of a retaining member 24 (Fig. 5), through which the bolts 22 pass. The retaining member 24 has a rectangular base plate 242 on which the parallel plates 241 are erected, and this base plate 242 abuts against the outer surface of the outermost rectangular rod 3, thereby holding down and positioning the multiple rectangular rods 3, 4 arranged side by side (Fig. 2). Such a retaining plate reliably prevents the lower halves of the base ends of the rectangular rods 3, 4 arranged side by side from shifting in a direction perpendicular to their longitudinal direction (a direction perpendicular to the plane of the paper in Fig. 2).

[0027] After the primary lining of tunnel T, in which the surface of the sprayed concrete is covered with a waterproof sheet, the inner periphery T1 of tunnel T has an uneven excavation surface, as shown in Figure 1. Therefore, the tip of the end plate that abuts against the inner periphery T1 must be shaped to match the cross-section of the inner periphery. In the end plate devices 1A-1C described above, as shown in Figure 1, adjacent rectangular rods 3 and 4 are advanced until their tips abut against the waterproof sheet on the inner periphery T1 of tunnel T. As a result, an end plate with a shape that matches the uneven cross-section of the tunnel inner periphery T1 is formed. As shown in Figures 5 and 6, a space S for pouring the secondary lining concrete is defined between the outer periphery 5 of the tunnel center formwork and the tunnel inner periphery T1. In the gaps between end plate devices 1A-1C, in which rectangular rods 3 and 4 of the same width are arranged side by side, end plates 9 of a conventional structure (see Figure 9) are installed, as shown in Figure 1.

[0028] According to the end plate devices 1A to 1C of this embodiment, there is no need to cut the end plate tip as in the conventional method, and each square rod body 3, 4 can withstand the pressure of the concrete injected into the pouring space S by means of the retaining plate 23 that penetrates the lower half of its base end and the pin body 41 and groove 31 that engage with each other in the upper half of the tip, so there is no need to install a burr support material to support the back of the end plate as in the conventional method.

[0029] (Second embodiment) A second embodiment of the present invention is shown in Figure 7. In this embodiment, a holding member 7 that holds a plurality of rectangular rods 6 similar to those of the first embodiment that make up the end plate device 1 is fixed to the tip of a rod 81 of a drive cylinder 8 that is provided at the face-side end 53 of the outer periphery 5 of the formwork of the tunnel center.

[0030] With this structure, after the secondary lining concrete C is poured into the casting space S partitioned and formed by the end plate device 1 and cured, the rod 81 is extended as shown in Figure 8 to move the retaining member 7 away from the face-side end 53, thereby making it possible to easily peel the rectangular rod body 6 from the end face of the poured concrete C.

[0031] In this embodiment, rubber (resin) caps 61 are attached to the ends of each rectangular rod 6 in a line to fill the gap between the end and the tunnel inner circumference T1. A similar structure can also be applied to the rectangular rods 3 and 4 of the first embodiment. Of course, a rubber cap 61 may be provided for each rectangular rod 3, 4, and 6. Also, scale plates may be attached in the longitudinal direction of the rectangular rods 3, 4, and 6, and the thickness of the secondary lining concrete may be measured based on the amount of advancement of the rectangular rods 3, 4, and 6.

[0032] (Third embodiment) In the first embodiment, the restricting member is constituted by the recessed groove 31 formed in the rectangular rod 3 and the pin 41 provided on the rectangular rod 4, and allows the rectangular rods 3, 4 to move independently in the longitudinal direction while restricting their mutual displacement in a direction perpendicular to the longitudinal direction. However, as shown in Figures 9(1), (2), and (3), the rectangular rod 6 may be configured such that multiple identical members 62, 83, and 64 are connected in the longitudinal direction by fitting their respective convex portions 621, 631, and 641 with their concave portions 622, 632, and 642, thereby restricting their displacement in a direction perpendicular to the longitudinal direction. It is needless to say that the shapes of the convex portions and concave portions are not limited to those exemplified in Figure 9.

[0033] (Fourth embodiment) In this embodiment shown in Figures 10 and 11, a roller body 10 is rotatably supported between both ends of the angle bar of the retaining member 2 of embodiment 1. The roller body 10 is made of a soft, elastic material or the like, and the outer surface of the roller body 10 is in sliding contact with the lower side surfaces of multiple rectangular rods 3, 4. When the roller body 10 is rotated by an impact wrench, motor, or the like, the resulting frictional force causes the multiple rectangular rods 3, 4 to advance simultaneously toward the tunnel inner surface T1.

[0034] Although the timing at which the rectangular rods 3, 4 come into contact with the uneven cross section of the tunnel inner surface T1 differs, the rectangular rods 3, 4 advance by friction with the outer surface of the rotating roller body 10, so that the rectangular rods 3, 4 that reach the tunnel inner surface T1 first stop there, and only the rectangular rods 3, 4 that have not yet reached the tunnel inner surface T1 advance further.

[0035] As a result, as shown in Figure 12, each of the rectangular rods 3, 4 is extruded into a shape that matches the uneven cross section of the tunnel inner surface T1, forming a gable plate that defines the space S for pouring the secondary lining concrete.

[0036] According to this embodiment, all of the rectangular rods 3, 4 held by the holding member 2 can be advanced simultaneously, thereby shortening the installation work. By reversing the rotation of the roller body 10 to retract each of the rectangular rods 3, 4 and bringing the base ends of all of the rectangular rods 3, 4 into contact with a stopper panel or the like (not shown), the state shown in Figure 10 is restored. [Explanation of symbols]

[0037] 1...end plate device, 2...retaining member, 23...retaining plate, 3...rectangular rod body, 31...groove, 32...long hole, 4...rectangular rod body, 41...pin body, 42...long hole, 5...formwork outer periphery, 53...end, 6...rectangular rod body, 62, 63, 64...same shaped members, 621, 631, 641...convex portion, 622, 632, 642...concave portion, 7...retaining means, 8...drive cylinder, 10...roller body, S...pouring space, T...tunnel, T1...tunnel inner surface.

Claims

1. A tunnel center end plate device is installed at the end of the outer periphery of the formwork of a tunnel center and defines a space for pouring lining concrete between the outer periphery of the formwork and the inner periphery of the tunnel, characterized in that it comprises a retaining member that is attached to the end of the outer periphery of the formwork and extends circumferentially, and a plurality of rectangular rod bodies that are held by the retaining member and are arranged adjacent to each other so that they can move independently of each other in their longitudinal direction, and each rectangular rod body advances toward and abuts against the inner periphery of the tunnel to define the pouring space.

2. A tunnel center end plate device as described in claim 1, wherein a regulating member is provided between the rectangular rod bodies to allow independent movement of adjacent rectangular rod bodies in the longitudinal direction while regulating mutual misalignment in a direction perpendicular to the longitudinal direction.

3. 2. The tunnel center end plate device according to claim 1, wherein each of the rectangular rods is formed into a shape that restricts displacement in a direction perpendicular to its longitudinal direction.

4. A tunnel center end plate device as described in claim 1, wherein adjacent rectangular rod bodies have long holes formed therethrough extending longitudinally, and a retaining plate having a width shorter than the length of the long hole is installed and penetrates the long hole.

5. 2. A tunnel center end plate device as described in claim 1, further comprising roller bodies whose outer surfaces slide against the side surfaces of the rectangular rod bodies to advance them toward the inner surface of the tunnel.

6. 2. The tunnel center end plate device according to claim 1, further comprising a driving means for moving the holding member in a direction away from the outer periphery of the formwork.

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