Concrete distribution device

Abstract

To provide a concrete distribution device which can realize smooth concrete supply and reduction of piping space by minimizing the number of curved parts of a concrete discharge pipe.SOLUTION: A concrete distribution device comprises a cylindrical housing 2 having connecting holes 21 at multiple positions on its outer periphery, to which concrete discharge pipes 68 are connected, and a cylindrical valve body 4 that is rotatably accommodated within the housing 2 with its inner and outer peripheries in contact and has a connecting hole 41 at one position on its outer periphery that leads to a connecting pipe 42 to which concrete supply pipes 63, 64 are connected. One end of the connecting pipe 42 is connected to the connecting hole 41 in the valve body 4, and the other end is positioned on the rotation axis O of the valve body 4 and is connected to the concrete supply pipes 63, 64 so as to be rotatable relative to them about the pipe axis, so that when the valve body 4 is rotated to a predetermined position, the concrete supply pipes 63, 64 are selectively connected to one of the concrete discharge pipes 68.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a concrete distribution device, and more particularly to a concrete distribution device suitable for distributing and supplying lining concrete into a concrete pouring space formed outside a tunnel center. [Background technology]

[0002] One example of this type of concrete distribution device is shown in Patent Document 1. In this device, multiple connection holes are provided in the upright face plate, and concrete discharge pipes that reach required locations on the periphery of the tunnel center are connected to these connection holes, while a concrete supply pipe (pressure pipe) is connected to a rotating plate that rotates in an upright position along the face plate, so that when the rotating plate rotates to a predetermined position, the concrete supply pipe and one of the concrete discharge pipes are selectively connected. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3138077 Summary of the Invention [Problem to be solved by the invention]

[0004] The concrete pouring space formed outside the tunnel center is formed to have an arc-shaped cross section between it and the inner circumference of the tunnel, and in order to supply concrete into this concrete pouring space sequentially from both sides below the tunnel center, most of the concrete discharge pipes extending from the concrete distribution device to the above-mentioned pouring space are directed to different positions in the vertical direction. In this case, in order to ensure smooth concrete supply, it is necessary to ensure that the curved parts of the concrete discharge pipes have a sufficient radius of curvature, and it is desirable to minimize the number of curved parts.

[0005] However, in the conventional concrete distribution device, the concrete discharge pipe extends horizontally from the upright face plate, so it is necessary to bend it upward or downward along the way. This is not only disadvantageous for smooth concrete supply, but also poses the problem of making it difficult to secure piping space if the radius of curvature of the bend is increased to enable smooth concrete supply.

[0006] Therefore, the present invention aims to solve such problems and to provide a concrete distribution device that can minimize the number of curves in the concrete discharge pipe, thereby achieving smooth concrete supply and reducing piping space. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the first invention comprises a cylindrical housing (2) having connecting holes (21) at multiple positions on its outer periphery, to which concrete discharge pipes (68) are connected, and a cylindrical valve body (4) that is rotatably accommodated within the housing (2) with its inner and outer peripheries in contact and has a connecting hole (41) at one position on its outer periphery that leads to a connecting pipe (42) to which concrete supply pipes (63, 64) are connected, one end of the connecting pipe (42) being connected to the connecting hole (41) of the valve body (2) and the other end being positioned on the rotation axis (O) of the valve body (4) and connected to the concrete supply pipes (63, 64) so ​​as to be rotatable relative to them around the pipe axis, and when the valve body (4) is rotated to a predetermined position, the concrete supply pipes (63, 64) and one of the concrete discharge pipes (68) are selectively connected.

[0008] In the first invention, the connecting holes for connecting the concrete discharge pipes are provided on the outer periphery of the cylindrical housing, so many concrete discharge pipes can be extended upward or downward almost directly without large bends, allowing for smooth concrete supply. In addition, the piping space can be reduced because the concrete discharge pipes do not have to bend at a large radius. Furthermore, compared to the above-mentioned conventional device in which multiple connecting holes are provided on an upright face plate, the entire device can be made more compact even when the same number of connecting holes for connecting the concrete discharge pipes are provided.

[0009] In the second aspect of the present invention, the connecting pipe (42) is curved beyond the rotation axis (O) at a predetermined radius of curvature (R), and then curves in the opposite direction at a predetermined radius of curvature (R).

[0010] According to the second invention, even if the radius of curvature is increased to allow the concrete to flow smoothly, the housing does not need to be made larger in diameter, and the concrete distribution device can be maintained in a compact shape.

[0011] In the third aspect of the present invention, a driving means (5) is provided for rotationally driving the valve body (4).

[0012] 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]

[0013] As described above, the concrete distribution device of the present invention can reduce the number of curved sections in the concrete discharge pipe, thereby enabling smooth concrete supply. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a partial cross-sectional plan view of a concrete distribution device according to a first embodiment. [Figure 2] FIG. 2 is a partial cross-sectional side view of a concrete distribution device. [Figure 3]FIG. 1 is a front view of the housing of the concrete dispensing device. [Figure 4] FIG. 1 is an overall front view of a tunnel center with a concrete distribution device installed. [Figure 5] FIG. 1 is an overall plan view of a tunnel center with a concrete distribution device installed. [Figure 6] FIG. 10 is a perspective view of a concrete distribution device according to a second embodiment, seen from the front side. [Figure 7] FIG. 2 is a perspective view of the concrete distribution device as seen from the rear side. [Figure 8] FIG. 2 is a partial cross-sectional side view of a concrete distribution device showing a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0015] 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.

[0016] (First embodiment) Fig. 1 shows a partially sectional plan view of the concrete distribution device 1, and Fig. 2 shows a partially sectional side view thereof. Fig. 3 is a front view of the housing 2 of the concrete distribution device with the motor 5 removed, as seen from the direction of the arrow in Fig. 1.

[0017] In Figure 1, the concrete distribution device 1 has a cylindrical housing 2 (Figure 3), the sides of which are fixed to a base frame 3. The base frame 3 is fixed to the frame of the tunnel center, as will be described later. The outer periphery of the housing 2 is provided with a plurality of connecting holes 21 (seven in this embodiment) at equal intervals around the periphery, excluding the portion fixed to the base frame 3. Connecting pipes 22 of the same diameter protrude outward from these connecting holes 21. Each connecting pipe 22 is connected to a concrete discharge pipe that leads to a concrete supply port provided at each location in the tunnel center, as will be described later.

[0018] One opening of the housing 2 is closed by a cover plate 23 with a circular hole 231 formed in the center, and a closed cylindrical valve element 4 is inserted into the housing 2 from the other opening. The outer periphery of the valve element 4 contacts the inner periphery of the housing 2, and the valve element 4 is rotatable within the housing 2 concentrically with its axis O.

[0019] A connecting hole 41 (Fig. 2) is formed at one circumferential location on the outer periphery of the valve element 4, to which one end of a connecting pipe 42 of the same diameter, which has entered the valve element 4, is connected from the inside. The connecting pipe 42 extends from inside the valve element 4 to outside the housing 2, passing over the rotation axis of the valve element 4 (the axis O of the housing 2), while curving to maintain a sufficiently large radius of curvature R to enable the smooth flow of ordinary viscous concrete. It then curves in the opposite direction while maintaining the same radius of curvature R, and its other end is positioned so that its opening center coincides with the axis O. With this structure, compared to when the connecting pipe 42 is curved only from one side as shown in Fig. 8, the outer diameter of the housing 2 can be kept small, thereby making the entire concrete distribution device 1 more compact, even when a sufficiently large radius of curvature R is maintained. The radius of curvature R on one side and the opposite side do not necessarily have to be the same.

[0020] In Figure 2, the outer periphery of the other end of the connecting pipe 42 is held by a sliding bearing 32 provided at the tip of a support leg 31 protruding from the base bracket 3, and the other end is connected to a concrete supply pipe leading from a concrete pump, as described below, so as to be able to rotate relatively around the pipe axis (axis center O).

[0021] A motor 5 is installed on the base frame 3, and the tip of a drive shaft 53 connected to the output shaft of the motor 5 via a gearbox 51 and a coupling 52 is coupled to the center of the circular end face of the valve body 4 through a circular hole 231 in the housing 2. As a result, when the motor 5 is rotated, the valve body 4 rotates accordingly, and the connecting hole 41 of the valve body 4 aligns with one of the connecting holes 21 in the housing 2, and the concrete supply pipe is selectively connected to one of the concrete discharge pipes via the connecting pipes 42, 22.

[0022] When the valve element 4 rotates, the connecting pipe 42 also rotates (indicated by the dashed line in Figure 1), but because the center of the opening at the other end coincides with the rotation axis O of the valve element 4, the other end does not move left or right or up or down, but rotates relative to the axis of the concrete supply pipe connected to it. The fact that the concrete supply pipe is connected to the specified concrete discharge pipe, that is, that the connecting hole 41 of the valve element 4 coincides with the specified connecting hole 21 of the housing 2, can be determined by controlling the rotation of a sensor and target (not shown) provided in the rotating part, or by counting the number of forward and reverse rotations of the motor 5, etc.

[0023] 4 and 5 show an overall front view and an overall plan view, respectively, of a tunnel center 6 in which two of the above-mentioned concrete distribution devices 1A and 1B are installed. The concrete distribution devices 1A and 1B have the same structure, and their base frames 3 are fixed to frames 61 and 62 of the tunnel center 6, respectively, and are installed at left and right positions in the width direction within the tunnel center 6. Concrete supply pipes 63 and 64 connected to the connecting pipes 42 (Fig. 5) of each concrete distribution device 1A and 1B are respectively connected to a pair of outlet pipes 651 and 652 of a concrete changeover valve 65 provided at one longitudinal end of the tunnel center 6. The inlet pipe 653 of the concrete changeover valve 6 is connected to a concrete pump (not shown) via a main concrete supply pipe 66.

[0024] The concrete switching valve 65 can switch between a state in which the inlet pipe 653 is connected to both outlet pipes 651, 652, or a state in which the inlet pipe 653 is connected to either one of the outlet pipes 651, 652, by moving the internal valve body.The switching is performed depending on the concrete injection situation into the concrete pouring space S (Figure 4) formed in an arc shape outside the tunnel center 6, and concrete is supplied to both or either of the concrete distribution devices 1A, 1B via concrete supply pipes 63, 64 connected to the outlet pipes 651, 652.

[0025] A concrete discharge pipe 68 is connected to each connecting pipe 22 (Fig. 4) of the pair of concrete distribution devices 1A, 1B, leading to a concrete supply port 67 provided on the outer periphery of the tunnel center 6. Here, it is not necessarily necessary to connect the concrete discharge pipes 68 to all connecting pipes 22; as shown in Fig. 4, in this embodiment, concrete discharge pipes 68 are connected to all connecting pipes 22 in the concrete distribution device 1B, but concrete discharge pipes 68 are connected only to the required number of connecting pipes 22 in the concrete distribution device 1A.

[0026] As mentioned above, in order to supply concrete into the concrete pouring space S sequentially from both sides below, most of the concrete supply ports 67 are provided at different positions in the vertical direction, as shown in Figure 4, and most of the concrete discharge pipes 68 extending from the concrete distribution devices 1A, 1B to the concrete supply ports 67 are directed in the vertical direction.

[0027] In the concrete distribution devices 1A and 1B of the present invention, the connecting pipes 22 (and the connecting holes 21 of the housing 2 from which they protrude) that connect the concrete discharge pipes 68 are provided on the outer periphery of the housing 2, so that many of the concrete discharge pipes 68 can be extended almost directly to the concrete supply ports 67 above or below without having to bend significantly. This allows for smooth concrete supply, and also makes it easier to secure piping space because there are no bends with large radii of curvature. Furthermore, compared to the above-mentioned conventional devices that have multiple connecting holes in an upright face plate, the entire device can be made more compact even when the same number of connecting holes are provided to connect the concrete discharge pipes.

[0028] The valve body of the concrete distribution device does not necessarily have to be rotated by a motor; for example, it may be rotated by converting linear motion into rotary motion using a rack and pinion system, or by manual power.

[0029] (Second embodiment) An example of a concrete distribution device 7 for use with high-fluidity concrete or medium-fluidity concrete, which are special low-viscosity concretes, is shown in Figures 6 and 7. Figure 6 is a perspective view of the concrete distribution device 7 seen from the front, and Figure 7 is a perspective view of it seen from the back. The concrete distribution device 7 has a partially cut cylindrical housing 8, and the housing 8 is fixed to the frame 601 of the tunnel center 6 at its partially cut circular portion.

[0030] Multiple (three in this embodiment) connecting pipes 71 are protruding outward at equal intervals from the outer periphery of the housing 8, and each connecting pipe 71 is connected to a concrete discharge pipe 68 that leads to concrete supply ports installed at various locations in the tunnel center 6.

[0031] A cylindrical valve element 9 (Fig. 6) is inserted into the housing 8. The outer periphery of the valve element 9 contacts the inner periphery of the housing 8, and the valve element 9 is rotatable concentrically with its axis within the housing 8. A connecting hole (not shown) is formed in one circumferential position on the outer periphery of the valve element 9, and one end of a connecting pipe 81 (Fig. 6) of the same diameter that is inserted into the valve element 9 is connected to this hole from the inside.

[0032] ) Since the connecting pipe 81 is made of high-fluidity concrete or the like, its shape may be curved only from one side as shown by reference numeral 42 in Figure 8, and the radius of curvature R can be made sufficiently small. Therefore, the outer diameter of the housing 8 does not become larger than necessary.

[0033] In Figure 6, the outer periphery of the other end of the connecting pipe 81 is held by a sliding bearing 32 provided on the frame 601 of the tunnel center 6, and a concrete supply pipe 63 leading from a concrete pump is connected to the other end so that it can rotate relatively around the pipe axis.

[0034] Meanwhile, a drive cylinder 10 is mounted in a vertical position on a bracket 602 (Fig. 7) erected on a frame 601 of the tunnel center 6, and the tip of a rod 101 extending from the lower end of the drive cylinder 10 is connected to a link piece 103 attached to the outer periphery of a drive shaft 102. The tip of the drive shaft 102 is connected to the center of a valve body 9 inside the housing 8, and when the rod 101 of the drive cylinder 10 is advanced or retreated, the drive shaft 102 (and valve body 9) rotates forward or backward by a predetermined angle in response, and the connecting hole of the valve body 9 aligns with one of the connecting holes in the housing 8, so that the concrete supply pipe 63 is selectively connected to one of the concrete discharge pipes 68 via the connecting pipes 81, 71. [Explanation of symbols]

[0035] 1, 1A, 1B, 7...concrete distribution device, 2, 8...housing, 21...connecting hole, 4, 9...valve body, 41...connecting hole, 42, 81...connecting pipe, 5...motor (driving means), 6...tunnel center, 63, 64...concrete supply pipe, 68...concrete discharge pipe, 10...driving cylinder (driving means), O...rotating shaft

Claims

1. A concrete distribution device comprising: a cylindrical housing having connecting holes at multiple positions on its outer periphery, to which concrete discharge pipes are connected; and a cylindrical valve body rotatably accommodated within the housing with its inner and outer peripheries in contact and having a connecting hole at one position on its outer periphery that leads to a connecting pipe to which a concrete supply pipe is connected, one end of the connecting pipe being connected to the connecting hole in the valve body and the other end being positioned on the rotation axis of the valve body and connected to the concrete supply pipe so as to be rotatable relative to the pipe axis, and when the valve body is rotated to a predetermined position, the concrete supply pipe and one of the concrete discharge pipes are selectively connected to each other.

2. 2. The concrete distribution device according to claim 1, wherein the connecting pipe is curved beyond the rotation axis with a predetermined radius of curvature and then curved in the opposite direction with a predetermined radius of curvature.

3. 3. The concrete distribution device according to claim 1, further comprising a driving means for rotationally driving the valve body.

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