Press-feeding pipe unit, installation method, and installation system

Abstract

To provide a simple device allowing installation of concrete.SOLUTION: A press-feeding pipe unit arranged inside of a slide form includes a plurality of press-feeding pipes connected to each other along the inner periphery of the slide form, wherein the plurality of press-feeding pipes includes at least one branch pipe. The branch pipe includes: a main pipe part making concrete flow in the inner peripheral direction of the slide form; a branch pipe part branching from the main pipe part to make the concrete flow to a concrete installation port of the slide form; and a switching member for switching a concrete flowing direction either to the main pipe part side or the branch pipe part side at the branched part of the main pipe part and the branch pipe part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a pressure pipe unit, a concrete driving method, and a concrete driving system. [Background technology]

[0002] To line the inner surface of a tunnel with concrete, a sliding center (mobile center) that can move in the longitudinal direction of the tunnel (back and forth) is inserted into the tunnel, and a concrete pouring space is formed between the arch-shaped formwork installed on the sliding center and the inner surface of the tunnel, and concrete pumped by a concrete pump is poured into the pouring space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-179985 Summary of the Invention [Problem to be solved by the invention]

[0004] The tunnel lining device described in Patent Document 1 includes a center that is arranged to form a gap between the inner wall surface of the tunnel and has multiple openings, and a pressure pipe that pressure-feeds the concrete to be poured in the gap to the pouring position. The pressure pipe includes at least two systems among a piping switching pouring system, a manipulator-type pouring system, and a fixed-type pouring system in order to change the pouring height as the top surface of the poured concrete rises. Such a system is large-scale. For this reason, a simpler device is required. [Means for solving the problem]

[0005] The pressure transport pipe unit of the present disclosure is a pressure transport pipe unit provided inside a slide center and includes a plurality of pressure transport pipes connected to each other along the inner circumference of the slide center, the plurality of pressure transport pipes including at least one branch pipe, the branch pipe including a main pipe section that causes the concrete to flow toward the inner circumference of the slide center, a branch pipe section that branches off from the main pipe section and causes the concrete to flow toward the concrete pouring port of the slide center, and a switching member for switching the flow direction of the concrete to either the main pipe section side or the branch pipe section side at the branching portion between the main pipe section and the branch pipe section.

[0006] The present disclosure can be realized not only as a pressure-transfer pipe unit having the above-described characteristic configuration, but also as a concrete pouring method using the pressure-transfer pipe unit, and a concrete pouring system provided with a slide center and the pressure-transfer pipe unit. Effect of the Invention

[0007] According to the present disclosure, concrete can be poured using simple equipment. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a front view showing an example of a concrete pouring system according to embodiment 1. [Diagram 2] 1 is a side view and a plan view showing an example of a concrete pouring system according to embodiment 1. [Diagram 3] FIG. 2 is a schematic diagram showing an example of a pressure pipe unit. [Figure 4] 1 is a schematic diagram showing an example of a branch pipe portion of a ceiling branch pipe. FIG. [Diagram 5] FIG. 2 is a schematic diagram showing an example of a branch pipe. [Figure 6] 1 is a flowchart showing an example of a concrete pouring method according to embodiment 1. [Figure 7] FIG. 11 is a side view showing an example of a concrete pouring system according to embodiment 2. [Figure 8]10 is a flowchart showing an example of a concrete pouring method according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Overview of the embodiment of the present disclosure> Below, an overview of the embodiments of the present disclosure will be listed and described.

[0010] (1) The pressure pipe unit according to this embodiment is a pressure pipe unit provided inside a slide center, and includes a plurality of pressure pipes connected to each other along the inner circumference of the slide center, and the plurality of pressure pipes include at least one branch pipe, and the branch pipe includes a main pipe section that causes concrete to flow toward the inner circumference of the slide center, a branch pipe section that branches off from the main pipe section and causes the concrete to flow toward the concrete pouring port of the slide center, and a switching member that switches the flow direction of the concrete to either the main pipe section side or the branch pipe section side at the branching portion between the main pipe section and the branch pipe section. This allows concrete to be poured using a simple device.

[0011] (2) In the above (1), the main pipe section may include a first main pipe section upstream of the branching section and a second main pipe section downstream of the branching section, and the second main pipe section may be connected to the first main pipe section and detachable from the first main pipe section, thereby making it easy to clean the branching pipe including the switching member.

[0012] (3) In the above (1), the plurality of pressure pipes may further include flexible piping that connects the plurality of pressure pipes and is configured to be freely bendable, whereby the slide center can be extended and retracted with the pressure pipe unit attached to the slide center.

[0013] (4) In the above (1), the portion of the main pipe downstream of the branch portion is located radially inward of the slide center from the branch pipe, and the switching member does not block the flow of the concrete on the branch pipe side, but may switch the flow of the concrete on the main pipe side to either blocking or guiding it. This makes it possible to switch the flow of concrete using a switching member with a simple structure.

[0014] (5) In the above (1), the at least one branch pipe may include a ceiling branch pipe arranged in a ceiling portion of the slide center, and the branch pipe portion of the ceiling branch pipe may further include an opening / closing member for switching between blocking or guiding the flow of the concrete in the branch pipe portion. This allows concrete to be poured into the ceiling portion of the slide center without gaps.

[0015] (6) A concrete pouring method according to the present embodiment is a concrete pouring method using the pressure pipe unit according to any one of (1) to (5) above, comprising the steps of: pouring the concrete from a first pouring port defined below in a state where a switching member of a first branch pipe defined below is switched to the branch pipe side and a switching member of a second branch pipe defined below is switched to the main pipe side; and pouring the concrete from a second pouring port defined below in a state where a switching member of the second branch pipe defined below is switched to the branch pipe side when the concrete has been poured up to the height of the first pouring port. First pouring port: concrete pouring port located lower than the second pouring port, second pouring port: concrete pouring port located higher than the first pouring port, first branch pipe: branch pipe whose branch trunk is inserted into the first pouring port, second branch pipe: branch pipe whose branch trunk is inserted into the second pouring port. This allows concrete to be poured using a simple device.

[0016] (7) The concrete pouring system according to this embodiment is a concrete pouring system provided with a slide center and a pressure pipe unit provided inside the slide center, the pressure pipe unit includes a plurality of pressure pipes connected to each other along the inner circumference of the slide center, the plurality of pressure pipes include at least one branch pipe, the branch pipe includes a main pipe section that causes the concrete to flow toward the inner circumference of the slide center, a branch pipe section that branches off from the main pipe section and causes the concrete to flow to a concrete pouring port of the slide center, and a switching member for switching the flow direction of the concrete to either the main pipe section side or the branch pipe side at the branching portion between the main pipe section and the branch pipe section. This allows concrete to be poured with a simple device.

[0017] (8) In the above (7), a ceiling pressure pipe unit for flowing concrete to the ceiling part on the tunnel entrance side of the slide center is further provided, and the ceiling pressure pipe unit including a ceiling branch pipe is connected to the upstream side of the pressure pipe unit, and the ceiling branch pipe includes a main pipe part for flowing concrete to the pressure pipe unit, a branch pipe part branching from the main pipe part for flowing the concrete to the entrance side ceiling pouring port defined below, and a switching member for switching the flow direction of the concrete to either the main pipe side or the branch pipe side at the branching part between the main pipe part and the branch pipe part. Entrance side ceiling pouring port: A concrete pouring port in the ceiling part on the tunnel entrance side of the slide center. This allows dense concrete to be poured.

[0018] [Terminology definition] The definitions of terms used in this application are as follows: -Slide centre: A movable arch-shaped formwork for pouring concrete into the tunnel walls. · Pouring space: The space formed between the slide centre and the inner surface of the tunnel where concrete is poured. · Portal: The part where a tunnel enters or exits the ground. · Face: The most advanced part of a tunnel excavation. Hinge: A component that connects components together. It uses pins and other elements to prevent movement up, down, left, and right, but allows for free rotation. Pipe joint: A component that firmly fastens pipes together, for example by tightening a flange-shaped part provided at the opening of a pipe. · Bent pipe: A pipe that curves and allows concrete to flow. It is shaped like the katakana character "ノ". ·Jack: A mechanical device that lifts heavy objects vertically or moves them in a specific direction. It is driven by hydraulics, gears, screws, etc.

[0019] <Embodiment 1> FIG. 1 is a front view showing an example of an overview of the concrete pouring system according to the first embodiment. Fig. 2 is a schematic diagram showing an example of an overview of the concrete pouring system according to embodiment 1. Fig. 2(a) is a side view of the concrete pouring system, and Fig. 2(b) is a plan view of the concrete pouring system. The present disclosure will now be described with reference to the drawings.

[0020] [1-1. Overall configuration of the concrete pouring system] In Fig. 1, the concrete pouring system 1 includes a slide center 2 and a pressure pipe unit 3. The slide center 2 forms a pouring space 5 between itself and the inner circumferential surface of the tunnel, into which unhardened concrete for lining is poured. The pressure pipe unit 3 is provided inside the slide center, and includes a plurality of pressure pipes connected to each other along the inner periphery of the slide center. The pressure pipe unit 3 guides the concrete to be pumped to the pouring space 5.

[0021] The concrete pouring system 1 can run on rails 13a laid on the floor surface inside the tunnel 6. The concrete pouring system 1 moves sequentially a predetermined distance from the tunnel entrance side (left side of Fig. 2) to the face side (right side of Fig. 2) and is fixed. The fixed concrete pouring system 1 is configured to form a concrete pouring space 5 (see Fig. 1). In this specification, the tunnel longitudinal direction (extension direction) is sometimes referred to as the front-rear direction, the tunnel width direction is sometimes referred to as the left-right direction, and the tunnel height direction is sometimes referred to as the up-down direction. The tunnel entrance side in the tunnel longitudinal direction is sometimes referred to as the front side, and the face side is sometimes referred to as the rear side.

[0022] In this embodiment, two sets of concrete pump trucks 21 and concrete mixer trucks 22 are used. The first set is stopped at the face side, and the second set is stopped at the tunnel mouth side. The concrete mixer truck 22 transports pre-prepared concrete to the tunnel construction site. The concrete pump truck 21 receives concrete from the concrete mixer truck 22 and pumps it to the pouring system 1. The first end of the pressure pipe 23 is connected to the concrete pump truck 21, and the second end is connected to the pressure pipe unit 3. The two sets of concrete pump trucks 21 and concrete mixer trucks 22 may start pumping concrete at the same time. The concrete is poured evenly into the pouring spaces 5 on the left and right in FIG. 1, and the slide center 2 is prevented from being distorted unevenly in the left and right directions of the tunnel 6.

[0023] The number of pairs of concrete pump truck 21 and concrete mixer truck 22 may be one pair. In the case of one pair, a Y-shaped pipe (not shown) for dividing the concrete to the pressure pipe units 3 arranged on the left and right in Fig. 1 is connected to the second end of pressure pipe 23. Then, pressure pipe unit 3 is connected to the downstream opening of the Y-shaped pipe. This is to pour concrete evenly into pouring spaces 5 on the left and right in Fig. 1.

[0024] The concrete pump truck 21 and the concrete mixer truck 22 can pour concrete twice as fast and take half the time compared to one set. The construction period for pouring concrete for the entire tunnel can be shortened with two sets compared to one set. However, since two sets are larger than one set, it is best to decide whether to use one set or two sets depending on the size of the tunnel for pouring concrete.

[0025] Next, details of each component of the concrete pouring system will be described.

[0026] [1-2. Slide center configuration] The slide center 2 is formed on a cross-sectional arc that is approximately aligned with the inner circumferential surface 7a of the tunnel. The slide center 2 has a length of, for example, 10 m in the front-to-rear direction of the tunnel, and is installed so as to cover the inner circumferential surface 7a, spaced apart, for example, by 30 cm from the inner circumferential surface 7a. By installing the slide center 2, a pouring space 5 is formed between the outer circumferential surface 7b of the slide center 2 and the inner circumferential surface 7a of the tunnel. The pouring space 5 is filled with concrete 8.

[0027] The slide centre 2 is equipped with a form panel 17 which forms the inner periphery of the concrete 8. The form panel 17 is formed of a plate material several millimeters thick, for example a steel plate material. The outer periphery 7b of the form panel 17 is, for example, processed to have a matte finish. For example, the matte finish is achieved by applying a paint containing ceramic. The matte finish is achieved in order to prevent the release agent from flowing. The release agent is applied to the outer periphery 7b which comes into contact with the concrete 8, in order to make it easier to remove the form panel 17 from the frame after the concrete has hardened.

[0028] The slide center 2 also includes an upper portion 15a that molds the top portion of the concrete 8, side portions 15b that are connected to both ends of the upper portion 15a and mold the side wall portions of the concrete 8, and a lower end portion 15c that is connected to the lower end of the side portion 15b and molds the lower end portion of the side wall portion of the concrete 8. A hinge 15d connects the upper portion 15a to the side portion 15b. Similarly, a hinge 15d connects the side portion 15b to the lower end portion 15c.

[0029] The upper part 15a of the slide center 2 is supported by a plurality of jacks 16a provided on the base part 13c of the gate-shaped dolly 13b so as to be movable up and down. The side part 15b is connected to the gate-shaped dolly 13b by a plurality of jacks 16b provided on the outer surface of the support 19, and the hinge 15d connects the upper part 15a and the side part 15b. Therefore, by extending and retracting the jacks 16b, the side part 15b rotates around the hinge 15d, enabling it to extend and retract in the width direction.

[0030] The lower end 15c of the slide center 2, like the side portion 15b, is connected to the gate-shaped cart 13b by a jack 16c provided on the outer surface of the support 19, and a hinge 15d connects the side portion 15b and the lower end 15c. Therefore, by extending or retracting the jack 16c, the lower end 15c rotates around the hinge 15d, and the slide center 2 can be extended or retracted in the radial direction.

[0031] In this way, the slide center 2 is connected and supported to the gate-shaped cart 13b by a plurality of jacks (support members) 16a, 16b, 16c provided on the upper surface of the base portion 13c and the outer surface of the support pillar 19, etc., and the entire slide center 2 can be raised and lowered relative to the gate-shaped cart 13b and can be expanded and contracted in the width direction by expanding and contracting each of the jacks 16a, 16b, 16c. This allows the form panel 17 to be removed from the hardened concrete after the concrete has hardened.

[0032] A plurality of pouring openings 11b are formed in the upper portion 15a and the side portion 15b of the formwork panel 17 in the circumferential direction of the slide center 2. A lid 12 is provided in each pouring opening 11b so as to be able to open and close. The pouring openings 11b are used for multiple purposes, such as for pouring concrete 8 into the pouring space 5, for inspecting the pouring state, and for inserting a compaction vibrator (not shown) into the pouring space 5. After the concrete has been poured, when the pouring opening 11b is closed by the lid 12, the lid 12 functions as a part of the formwork for the poured concrete.

[0033] A flat plate portion 13d may be provided on the upper portion of the gate-shaped cart 13b. The flat plate portion 13d has approximately the same length as the slide center 2 in the front-rear direction, and has a length approaching the vicinity of the slide center 2 in the left-right direction. The flat plate portion 13d has a thickness and structure corresponding to the load applied from above.

[0034] [1-3. Composition of the pressure pipe unit] The pressure pipe unit 3 is provided inside the slide center. The pressure pipe unit includes a plurality of pressure pipes connected to each other along the inner circumference of the slide center, and the plurality of pressure pipes include at least one branch pipe. The branch pipe includes a main pipe section that causes the concrete to flow toward the inner circumference of the slide center, a branch pipe section that branches off from the main pipe section and causes the concrete to flow toward the concrete pouring port of the slide center, and a switching member that switches the flow direction of the concrete to either the main pipe section side or the branch pipe section side at the branching portion between the main pipe section and the branch pipe section.

[0035] As shown in FIG. 1, the pressure pipe unit 3 is provided on the radial inside of the slide center, and is fixed to the form panel 17 by a support member while being spaced from the form panel 17. The pressure pipe unit includes a plurality of pressure pipes connected to each other along the inner circumference of the slide center. The plurality of pressure pipes includes at least one branch pipe, and may also include connecting pipes, vent pipes, and flexible pipes. Each component of the pressure pipe unit 3 is made of iron, for example. The branch pipe includes a main pipe section, a branch pipe section, and a switching member, and switches the flow of concrete. The connecting pipe is a pipe that connects the branch pipes and others to each other. The vent pipe is a pipe that changes the direction of the flow of concrete. The flexible pipe connects between the pressure pipes and is configured to be freely bendable.

[0036] FIG. 3 is a schematic diagram showing an example of the right half of the schematic of the pressure pipe unit 3. FIGS. 3(a), (b), (c), and (d) are diagrams showing the configuration of the pressure pipe unit 3 and the removal state in the concrete pouring method described below. The left half of the pressure pipe unit 3 has a configuration obtained by inverting the configuration shown in FIG. 3. In the example shown in FIG. 3, the pressure pipe unit 3 includes branch pipe units 31a, 31b, and 31c. Each of the branch pipe units 31a, 31b, and 31c includes a branch pipe 32 and vent pipes 33 and 34 from upstream to downstream. The branch pipe units 31a, 31b, and 31c are connected in series.

[0037] A vent pipe 36 is connected to the downstream opening of the vent pipe 34 of the most downstream branch pipe unit 31a. The branch pipe unit 31a and the branch pipe unit 31b are connected via a flexible pipe 37. A connection unit 31d is connected to the upstream opening of the most upstream branch pipe unit 31c. The connection unit 31d connects the downstream opening of the pressure pipe 23 to the upstream opening of the branch pipe unit 31c. The upstream opening of the pressure pipe 23 is connected to the concrete pump vehicle 21. The connection unit 31d includes a vent pipe 31d1, a connection pipe 31d2, and a vent pipe 31d3, and each member is connected in series. Each member is connected by pipe joints 35a, 35b, 35c, 35d, 35e, and 35f. As a result, these pressure pipes are connected from the concrete pump vehicle 21 to the vent pipe 34 of the most downstream branch pipe unit 31a, and can function as a single pressure pipe.

[0038] The vent pipe 33 connected downstream to the branch pipe side of each of the branch pipe units 31a, 31b, and 31c is inserted into a pouring port formed in the form panel 17. In addition, the vent pipe 36 connected to the main pipe side of the branch pipe unit 31a is also inserted into a pouring port formed in the form panel 17. Although an example in which the vent pipe is inserted into the pouring port has been described, this is not limiting, and for example, the downstream opening of the branch pipe part of the branch pipe or the downstream opening of the main pipe part may be inserted into the pouring port. In addition, the main pipe part of the branch pipe 32 and the vent pipe 34 may be configured as one unit.

[0039] Fig. 4 is a schematic diagram showing an example of a branch pipe portion of a ceiling branch pipe. Fig. 4(a) is a front view, and Fig. 4(b) is a side view. The branch pipe 32 of the most upstream branch pipe unit 31c is a ceiling branch pipe arranged in the ceiling part of the slide center. The branch pipe portion of the ceiling branch pipe may further include an opening and closing member that switches between blocking or guiding the flow of the concrete in the branch pipe portion.

[0040] In the example of Fig. 4, the opening / closing member 41 is provided on the vent pipe 33 that extends the downstream opening portion of the branch pipe section 52 downstream. The downstream opening portion of the vent pipe 33 may be connected to the form panel 17. When the downstream opening portion of the vent pipe 33 is connected to the form panel 17, the connection portion may be configured so that concrete does not leak from the connection portion. For example, the downstream opening portion of the vent pipe 33 may be welded to the upper portion 15a of the form panel 17, or may be fixed to the form panel 17 by a fixing member such as a bolt or a packing.

[0041] The opening / closing member 41 is driven by, for example, a hydraulic cylinder 42. When the hydraulic cylinder 42 retracts, the opening / closing member 41 moves downward in Fig. 4 to guide the flow of concrete, and the pressure-fed concrete is discharged into the pouring space 5. On the other hand, when the hydraulic cylinder 42 extends, the opening / closing member 41 moves upward in Fig. 4 to block the flow of concrete, and the pressure-fed concrete is not discharged into the pouring space 5. At the same time, the opening / closing member 41 closes the pouring port.

[0042] The opening / closing member 41 that closes the pouring port may be configured to function as a formwork when poured concrete solidifies, as part of the formwork panel 17. Specifically, for example, the surface of the opening / closing member 41 that functions as a formwork is formed to have a surface shape that conforms to the formwork panel 17. This makes it possible to prevent concrete filled in the pouring space 5 in the ceiling portion from flowing out of the pouring port. In addition, if the branch pipe 32 of the branch pipe unit 31c is configured to be removable from the vent pipe 33, the removed branch pipe 32 can also be easily washed.

[0043] [1-4. Branch pipe] Fig. 5 is a schematic diagram showing an example of the appearance of a branch pipe. Fig. 5(a) is a front view of the branch pipe, Fig. 5(b) is a side view of the branch pipe when the flow direction of concrete is switched to the branch pipe side, and Fig. 5(c) is a side view of the branch pipe when the flow direction of concrete is switched to the main pipe side. The branch pipe 32 includes a main pipe section 51, a branch pipe section 52, and a switching member 53.

[0044] [Main section] The main pipe section makes the concrete flow in the inner circumferential direction of the slide center. As shown in Fig. 5(b) and (c), the main pipe section 51 has a slightly curved shape following the circumferential shape of the slide center 2. The main pipe section is, for example, a cylindrical pipe with a diameter of 10 cm to 20 cm. Also, as shown in Fig. 5(a), the main pipe section 51 has a straight shape when the slide center 2 is viewed from the center of the tunnel. As described above, the three branch pipe units 31c are connected in series, so the main pipe sections included in the branch pipe units function as a single pressure pipe as a whole. As a result, the main pipe section makes the concrete flow in the inner circumferential direction of the slide center.

[0045] The main pipe section 51 includes a first main pipe section 51a located upstream of a branch section 54 defined below, and a second main pipe section 51b located downstream of the branch section 54. The second main pipe section 51b may be connected to the first main pipe section 51a and configured to be removable from the first main pipe section 51a. By removing the second main pipe section 51b from the first main pipe section 51a, a switching member described below is exposed, making it possible to easily clean the switching member. In addition, the inside of the vent pipe 34 connected downstream is also exposed, making it possible to easily clean the vent pipe 34. Branch section: The section of a branch pipe where the branch pipe branches off from the main pipe.

[0046] [Branch pipe section] The branch pipe section 52 branches off from the main pipe section 51 and allows concrete to flow into the concrete pouring port of the slide center. As shown in Fig. 1, Fig. 5(b) and Fig. 5(c), the branch pipe section 52 has a shape that branches out from the branching section 54 toward the outside in the radial direction of the slide center 2. For example, the shape from the upstream opening of the first main pipe section 51a to the downstream opening of the branch pipe section 52 has a gentle curve so that the pumped concrete does not stagnate. The part downstream of the branching section of the main pipe section is located radially inside the slide center from the branch pipe section.

[0047] [Switching parts] The switching member 53 is a member for switching the flow direction of concrete to either the main pipe section 51 side or the branch pipe section 52 side at the branch section 54 between the main pipe section 51 and the branch pipe section 52. As shown in Figures 5(b) and (c) , the switching member 53 is disposed at the branch section 54. The switching member 53 has, for example, a gate member 53a, a rotation support member 53b, and a handle member 53c.

[0048] The gate member 53a is a member for switching the flow direction of concrete to either the main pipe section 51 side or the branch pipe section 52 side. In the example shown in FIG. 5, the switching member 53 is configured not to block the flow of concrete on the branch pipe section 52 side, but to switch the flow of the concrete on the main pipe section 51 side to either blocking or guiding it. Since the second main pipe section 51b is located below the branch pipe section 52, concrete with a high specific gravity is guided to the main pipe section side when the switching member 53 guides the flow of concrete to the main pipe section 51 side, even if the switching member 53 does not block the flow of concrete on the branch pipe section side. On the other hand, when the switching member 53 blocks the flow of concrete to the main pipe section 51 side, the flow of concrete is guided to the branch pipe section 52 side. In this way, the flow of concrete can be switched by a simple switching structure that blocks or guides the flow of concrete on the main pipe section 51 side.

[0049] The gate member 53a has a shape that blocks the flow of the concrete on the main pipe section 51 side, for example a shape that follows the cross-sectional shape of the main pipe section 51, specifically a circular flat plate shape. One end portion of the outer periphery of the gate member 53a is supported by a rotation support member 53b. The gate member 53a is configured to be rotatable around the rotation support member 53b.

[0050] The handle member 53c is connected to the gate member 53a. The handle member 53c can rotate around the rotation support member 53b to rotate the gate member 53a. When the gate member 53a is in the position shown in FIG. 5(b), the gate member 53a closes the main pipe section 51 and blocks the flow of concrete. On the other hand, when the gate member 53a is in the position shown in FIG. 5(c), the gate member 53a opens the main pipe section 51, the gate member 53a does not block the flow of concrete, and the switching member 53 guides the flow of concrete to the main pipe section side. The handle member 53c may be rotated by hand, or by a hydraulic cylinder or an electric actuator.

[0051] In the example of FIG. 5, the rotation support member 53b is disposed on the outer periphery of the main pipe section 51. The position at which the rotation support member 53b is disposed is not limited to this, and as an example, the rotation support member 53b may be disposed at the center of the main pipe section 51 when viewed from a direction perpendicular to the flow of concrete. In this case, the rotation support member 53b supports the center of the gate member 53a along the plane of the flat-plate-shaped gate member 53a. In other words, when the plane of the flat-plate-shaped gate member 53a is viewed vertically, the member formed by the gate member 53a and the rotation support member 53b has a butterfly-like shape.

[0052] In the example of Fig. 5, the gate member 53a is rotated, but this is not limiting, and the gate member 53a may be moved in a direction perpendicular to the flow of concrete. In this case, instead of the rotation support member 53b and the handle member 53c, a moving member (not shown) for moving the gate member 53a is connected to the gate member 53a. The moving member inserts the gate member 53a into the main pipe portion 51 so as to close the main pipe portion 51. On the other hand, the moving member pulls out the gate member 53a from the main pipe portion 51 so as to open the main pipe portion 51.

[0053] [1-5. Flexible piping] The flexible pipe 37 connects a plurality of pressure pipes and is configured to be freely bendable. The flexible pipe 37 is, for example, a hose configured to withstand the pressure of pumping concrete, and is, for example, a hose in which high-strength fibers are woven into a cylindrical shape and the inside and outside of the envelope-shaped fibers are covered with rubber for protection. Alternatively, the flexible pipe 37 is a bellows-shaped metal pipe.

[0054] The flexible pipe 37 connects, for example, between the branch pipe unit 31b and the branch pipe unit 31a. Specifically, the flexible pipe 37 connects between the downstream opening of the vent pipe 34 of the branch pipe unit 31b and the upstream opening of the branch pipe 32 of the branch pipe unit 31a. As shown in Fig. 1, the flexible pipe 37 is disposed in a position near the hinge 15d of the slide center 2. This allows the slide center 2 to extend and retract in the left-right direction with the pressure feed pipe unit 3 attached to the slide center 2.

[0055] When removing the form panel 17, the multiple jacks (support members) 16a, 16b, 16c provided on the upper surface of the base portion 13c of the slide center 2 and the outer surface of the support 19 are extended and retracted to reduce the entire slide center 2 in the width direction relative to the gate-shaped dolly 13b and lower it. At this time, the form panel 17 rotates around the hinge 15d as the center of rotation. The flexible piping 37 makes it possible to deform the slide center 2 while the pressure feed pipe unit 3 is fixed to the slide center 2, and the form panel 17 can be easily removed from the form. Furthermore, the flexible piping 37 is located near the hinge 15d of the slide center 2, making it possible to deform the slide center 2 more easily. The flexible piping 37 may also be freely extended and retracted in the direction in which the concrete is guided. This makes it possible to deform the slide center 2 more easily.

[0056] [1-6. Pouring method] 6 is a flow chart showing an example of a concrete pouring method, which describes a method of pouring concrete into the space between the inner circumferential surface of the tunnel and the outer circumferential surface of the formwork.

[0057] [Step S01] First, the slide center 2 is installed in the tunnel 6. After the installation of the slide center 2 is completed, the process proceeds to step S02.

[0058] [Step S02] Next, a pressure pipe unit 3 as shown in Fig. 3(a) is installed inside the slide centre 2. The pressure pipe unit includes at least one branch pipe, but also includes a connecting pipe, a vent pipe and a flexible pipe, and these components are fixed sequentially to predetermined positions inside the slide centre by fixing members. The fixing members are, for example, column-shaped metal members. When installing the pressure pipe unit 3, a pressure pipe 23 is also installed. The pressure pipe 23 is a pressure pipe that connects the pressure pipe unit 3 and the concrete pump truck 21. After installing the pressure pipe unit 3, proceed to step S03.

[0059] [Step S03] Next, the first pouring is performed. In the first pouring, concrete is poured into the pouring space 5 from the lowest pouring port defined below. When performing the first pouring, all the switching members 53 are switched to a direction that guides the flow of concrete to the main pipe side. Hereinafter, switching the switching members 53 to a direction that guides the flow of concrete to the main pipe side is sometimes referred to as "switching the switching members 53 to the main pipe side", and switching the switching members 53 to a direction that guides the flow of concrete to the branch pipe side is sometimes referred to as "switching the switching members 53 to the branch pipe side". Then, after the concrete mixer truck 22 that transports the unhardened concrete that has been prepared in advance arrives at the slide center 2, pouring begins. As a result, as shown by the arrow in FIG. 3(a), the pumped concrete is discharged from the vent pipe 36 and poured into the pouring space 5. When pouring, the poured concrete may be vibrated by a vibrator to degas it. After starting pouring, proceed to step S04. The lowest concrete pouring port: A concrete pouring port provided at the lowest position in the circumferential direction of the slide center 2 into which the vent pipe 36 of the pressure pipe unit 3 is inserted.

[0060] [Step S04] Next, it is determined whether the poured concrete has been poured up to the pouring hole where the concrete is being poured. For example, it is determined whether the concrete has been poured up to the pouring hole by monitoring with a security camera, visual inspection, or a sensor from a pouring hole above the pouring hole where the concrete is being poured. If it is determined that the concrete has not been poured up to the pouring hole (NO in step S04), the process returns to step S03 and the pouring of the concrete continues. On the other hand, if it is determined that the concrete has been poured up to the pouring hole (YES in step S04), the process proceeds to step S05.

[0061] [Step S05] Next, the first switching is performed to switch the most downstream switching member 53 in which concrete is being poured to the branch pipe side. In the first switching, the switching member 53 is first switched to the branch pipe side. When switching, the pumping of concrete may be temporarily stopped. This is to prevent the work performed in step S05 from being hindered. Next, after the concrete in the vent pipe 36 is discharged into the pouring space 5, the second main pipe section 51b of the branch pipe unit 31a is removed from the pumping pipe unit 3 as shown in FIG. 3(b). Next, the vent pipe 36 is pulled out from the lowest pouring port, and the lid body 12 of the lowest pouring port is closed. The closed lid body 12, as a part of the formwork panel 17, functions as a formwork when the poured concrete solidifies. Next, the inside of the vent pipe 36, the inside of the removed second main pipe section 51b, and the exposed switching member 53 are washed. This is to prevent the remaining concrete from solidifying and hardening. After the switching member 53 is switched to the branch pipe side, the process proceeds to step S06.

[0062] [Step S06] Next, the second pouring is performed. In the second pouring, concrete is poured into the pouring space 5 from the first pouring port defined below. As shown by the arrow in Fig. 3(b), the pumped concrete is discharged from the vent pipe 33 of the branch pipe unit 31a and poured into the pouring space 5. After the pouring of concrete starts, proceed to step S07. First concrete pouring port: A concrete pouring port into which the vent pipe 33 connected to the downstream opening of the branch pipe section 52 is inserted and which is provided at a position higher than the lowest concrete pouring port.

[0063] [Step S07] Next, it is determined whether the poured concrete has been poured up to the pouring hole where the concrete is being poured. If it is determined that the concrete has not been poured up to the pouring hole (NO in step S07), the process returns to step S06 and continues pouring the concrete. On the other hand, if it is determined that the concrete has been poured up to the pouring hole (YES in step S07), the process proceeds to step S08.

[0064] [Step S08] Next, a second switching is performed in which the replacement member 53 of the branch pipe unit 31b one upstream from the branch pipe unit 31a in which concrete is being poured is switched to the branch pipe side. In the second switching, the switching member 53 is first switched to the branch pipe side. Then, as in step S05, the second main pipe section 51b is removed, the vent pipe 33 is pulled out, the lid 12 of the pouring port is closed, and the vent pipe 33 and the like are cleaned. After the switching member 53 has been switched to the branch pipe side, the process proceeds to step S09.

[0065] [Step S09] Next, the third pouring is performed. In the third pouring, concrete is poured into the pouring space 5 from the second pouring port defined below. As shown by the arrow in Fig. 3(c), the pumped concrete is discharged from the vent pipe 33 of the branch pipe unit 31b and poured into the pouring space 5. After the pouring of concrete starts, proceed to step S10. Second pouring port: A concrete pouring port into which the vent pipe 33 connected to the downstream opening of the branch pipe section 52 is inserted and which is provided at a higher position than the first pouring port.

[0066] [Step S10] Next, it is determined whether the poured concrete has been poured up to the pouring hole where the concrete is being poured. If it is determined that the concrete has not been poured up to the pouring hole (NO in step S10), the process returns to step S09 and continues pouring the concrete. On the other hand, if it is determined that the concrete has been poured up to the pouring hole (YES in step S10), the process proceeds to step S11.

[0067] [Step S11] Next, a third switching is performed in which the replacement member 53 of the branch pipe unit 31c one unit upstream of the branch pipe unit 31b being cast, in other words the most upstream branch pipe unit 31c, is switched to the branch pipe side. In the third switching, the switching member 53 is first switched to the branch pipe side. Then, as in step S05, the second main pipe section 51b is removed, the vent pipe 33 is pulled out, the lid 12 of the casting port is closed, and the vent pipe 33 and the like are cleaned. After the switching member 53 has been switched to the branch pipe side, the process proceeds to step S12.

[0068] [Step S12] Next, the fourth pouring is performed. In the fourth pouring, concrete is poured into the ceiling part of the pouring space 5 from the third pouring port defined below. As shown by the arrow in Fig. 3(d), the pumped concrete is discharged from the vent pipe 33 of the branch pipe unit 31c and fills the ceiling part in the pouring space 5. After the pouring of concrete starts, proceed to step S13. Third concrete pouring port: A concrete pouring port into which the vent pipe 33 connected to the downstream opening of the branch pipe section 52 is inserted and which is closer to the ceiling in the circumferential direction of the slide center 2 than the second concrete pouring port, in other words, is provided at a position closest to the ceiling.

[0069] [Step S13] Next, it is determined whether the ceiling of the pouring space 5 has been filled with the poured concrete. Whether the ceiling of the pouring space 5 has been filled is determined, for example, by whether concrete has leaked out from a hole provided at the highest position of the formwork that covers the face side of the slide center 2. If it is determined that concrete has not been poured up to the pouring hole (NO in step S13), the process returns to step S12 and pouring of concrete continues. On the other hand, if it is determined that concrete has been poured up to the pouring hole (YES in step S13), the process proceeds to step S14.

[0070] [Step S14] Next, the fourth switching is performed. In the fourth switching, the pumping of concrete is stopped, and the opening / closing member 41 provided on the vent pipe 33 connected to the branch pipe portion side of the branch pipe 32 of the most upstream branch pipe unit 31c is switched to the side that blocks the flow of concrete. The opening / closing member 41 blocks the flow of concrete and closes the pouring port at the same time. After the fourth switching is performed, proceed to step S15.

[0071] [Step S15] Next, the slide center 2 is left stationary for a predetermined period until the poured concrete solidifies. After the predetermined period has elapsed, the process proceeds to step S16.

[0072] [Step S16] Next, the form panel 17 is removed from the frame. To remove the form panel 17, a plurality of jacks (support members) 16a, 16b, 16c provided on the upper surface of the base portion 13c of the slide center 2 and on the outer surface of the support 19 are extended and contracted to reduce the entire form panel 17 in the width direction relative to the gate-shaped cart 13b and lower it. After the form panel 17 is removed from the frame, proceed to step S17.

[0073] [Step S17] Next, the slide center 2 is moved to the next work area and installed. After the slide center 2 is installed in the next work area, the process returns to step S03, and concrete is poured in the next work area. After concrete pouring is completed in all work areas, the series of operations ends.

[0074] It should be noted that the above steps may be omitted, added, or the order of execution may be changed within the scope of the effects of the embodiments of the present disclosure.

[0075] [1-7. Summary] As described above, according to the present disclosure, concrete can be poured using a simple device. In addition, the pouring location can be easily switched by a simple method of switching the switching member 53 from downstream to the branch pipe side in order. This makes it possible to reduce the work time. In addition, because it is a simple device, it is possible to reduce the work time for its installation, movement, and removal.

[0076] <Embodiment 2> FIG. 7 is a side view showing an example of an overview of the concrete pouring system according to the second embodiment. The present disclosure will now be described with reference to the drawings.

[0077] 2-1 Problems of the Second Embodiment The second embodiment is different from the first embodiment in that it further includes a ceiling pressure pipe unit 71 connected to the mouth side of the ceiling part of the slide center 2, but otherwise is the same as the first embodiment. In step 12 of the first embodiment, the ceiling part of the slide center 2 is poured. When pouring the ceiling part of the slide center 2, concrete is poured from a pouring port provided in the center of the slide center 2 in the tunnel longitudinal direction. However, since concrete does not have the same fluidity as water, there is a possibility that the concrete will not reach the mouth side and face side of the ceiling part of the slide center 2. FIG. 7(a) shows this state. In the pouring space 5 of the ceiling part of the slide center 2, the concrete 72 takes the form of a mountain peak near the pouring port, but as it progresses to the mouth side and face side, the concrete may drop like a mountain foot, and a void 73 may remain. The second embodiment is intended to fill the void 73 with concrete.

[0078] [2-2 Configuration of ceiling pressure pipe unit] In the second embodiment, as shown in FIG. 7(a), the ceiling pumping pipe unit 71 is provided in the middle of the pumping pipe 23 upstream of the pumping pipe unit 3. The ceiling pumping pipe unit 71 includes a branch pipe 71a, a connection pipe 71b, and a vent pipe 71c. The branch pipe 71a has the same configuration as the branch pipe 32. The upstream opening of the branch pipe 71a is connected to the pumping pipe 23. The downstream opening of the branch pipe 71a on the main pipe side is connected to the pumping pipe unit 3. The branch pipe side opening of the branch pipe 71a is connected to the upstream opening of the vent pipe 71c via the connection pipe 71b. The downstream opening of the vent pipe 71c is connected to the ceiling part of the slide center 2 by welding or the like. The vent pipe 71c includes an opening / closing member 71d. The opening / closing member 71d has the same configuration as the opening / closing member 41.

[0079] When guiding concrete to the pressure pipe unit 3 side, the switching member of the branch pipe 71a of the ceiling pressure pipe unit 71 is switched to the direction of guiding the concrete to the main pipe side. On the other hand, when guiding concrete to the ceiling part of the slide center 2, the switching member of the branch pipe 71a of the ceiling pressure pipe unit 71 is switched to the side that prevents the flow of concrete on the main pipe side and guides the concrete to the branch pipe side (FIG. 7(b)).

[0080] The opening / closing member 71d included in the vent pipe 71c of the ceiling pumping pipe unit 71 is switched to a direction for guiding the concrete when pouring the concrete into the ceiling part of the slide center 2 (FIG. 7(b)). On the other hand, when finishing pouring the concrete into the gap 73, the opening / closing member 71d is switched to a side for preventing the flow of the concrete and for closing the downstream opening part of the vent pipe 71c (FIG. 7(c)).

[0081] [2-3. Pouring method] 8 is a flowchart showing an example of a concrete pouring method in embodiment 2. In embodiment 2, steps S01 to S12 and steps S15 to S17 are the same as those in embodiment 1, so their explanations are omitted, and steps S21 to S25 will be explained.

[0082] [Step S21] After starting pouring concrete from the third pouring port into the ceiling of the pouring space 5 in the fourth pouring in step 12, the process proceeds to step S21. In step S21, it is determined whether the poured concrete has been poured into the ceiling of the pouring space 5 up to a predetermined height, for example, as defined below. Whether the concrete has been poured up to the predetermined height is determined, for example, by monitoring the poured concrete through a hole in a formwork that blocks the face side of the slide center 2. If it is determined that the concrete has not been poured up to the predetermined height (NO in step S21), the process returns to step S12 and continues pouring the concrete. On the other hand, if it is determined that the concrete has been poured up to the predetermined height (YES in step S21), the process proceeds to step S22. Predetermined height: The height of the concrete that allows the concrete to pass through the opening made by the concrete shaped like the top of a mountain and the inner surface 7a of the tunnel 6 in the casting space 5 in the ceiling part of the slide center 2.

[0083] [Step S22] Next, the fifth switching is performed. In the fifth switching, when it is determined in step S21 that the concrete has been poured to a predetermined height, the opening and closing member 41 provided on the vent pipe 33 connected to the branch pipe section side of the branch pipe 32 of the most upstream branch pipe unit 31c is first switched to the side that blocks the flow of concrete. The opening and closing member 41 blocks the flow of concrete and closes the pouring port at the same time. Next, the switching member of the branch pipe 71a of the ceiling pressure-feeding pipe unit 71 is switched to the side that guides the concrete to the branch pipe section side. Next, the opening and closing member 71d that has been preventing the flow of concrete and closing the opening is switched to the side that guides the concrete. Note that in step S22, the pressure-feeding of the concrete may be interrupted once. After the opening and closing member 71d is switched to the side that guides the concrete, the process proceeds to step S23.

[0084] [Step S23] Next, the fifth pouring is performed. In the fifth pouring, concrete is poured from the downstream opening of the vent pipe 71d of the ceiling pressure pipe unit 71. As shown by the arrow in FIG. 7(b), the pumped concrete is discharged from the downstream opening of the vent pipe 71d of the ceiling pressure pipe unit 71, and fills the gap 73 in the ceiling part of the pouring space 5. After the pouring of concrete starts, proceed to step S24.

[0085] [Step S24] In step S24, it is determined whether the poured concrete has filled the gap 73 in the ceiling portion of the pouring space 5. Whether the gap 73 has been filled is determined, for example, by whether the poured concrete has leaked out from a hole in a formwork that covers the face side of the slide center 2. If it is determined that the gap 73 has not been filled (NO in step S24), the process returns to step S23 and the pouring of concrete continues. On the other hand, if it is determined that the gap 73 has been filled (YES in step S24), the process proceeds to step S25.

[0086] [Step S25] Next, the sixth switching is performed. In the sixth switching, when it is determined in step S24 that the concrete has filled the voids 73 (FIG. 7(c)), first, pumping of the concrete is stopped. Next, the opening / closing member 71d, which had been switched to the side that guides the flow of the concrete, is switched to the side that blocks the flow of the concrete and closes the opening. After the opening / closing member 71d has been switched to the side that blocks the concrete, the process proceeds to step S15, and the slide center 2 is left stationary for a predetermined period until the poured concrete solidifies.

[0087] [2-4. Summary] As described above, in the second embodiment, the gap 73 that may occur in the ceiling portion of the slide center 2 is filled with concrete, and dense concrete can be poured.

[0088] [3. Note 1] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is defined by the claims rather than the above-described embodiments, and includes the meaning equivalent to the claims and all modifications within the scope thereof. [Explanation of symbols]

[0089] 1. Pouring system 2 Slide Center 3 Pressure Pipe Unit 5 Casting space 6. Tunnel 7a Inner surface 7b Outer surface 8. Concrete 11b pouring hole 12 Lid 13a Rail 13b Gate type cart 13c Base part 13d Flat plate part 15a Upper 15b Side 15c Bottom end 15d Hinge 16a, 16b, 16c Jack (support member) 17 Formwork Panel 19 Posts 21 Concrete pump truck 22 Concrete mixer truck 23 Pressure Pipe 31a, 31b, 31c Branch pipe unit 31d Connection unit 31d1, 31d3 Vent pipe 31d2 Connection piping 32 Branch Pipe 33, 34, 36 Vent pipe 35a, 35b, 35c, 35d, 35e, 35f Pipe joint 37 Flexible piping 41 Opening and closing members 42 Hydraulic cylinder 51 Main pipe section 51a 1st main pipe section 51b 2nd main pipe section 52 Branch pipe section 53 Switching parts 53a Gate member 53b Rotational support member 53c Handle material 54 Branching section 71 Ceiling pressure pipe unit 71a Branch pipe 71b Connection pipe 71c Vent pipe 71d Opening and closing parts 72 Concrete 73 void

Claims

1. A pressure pipe unit provided inside a slide center, a plurality of pressure pipes connected to each other along an inner circumference of the slide center; the plurality of pressure pipes includes at least one branch pipe; The branch pipe includes a main pipe section that causes concrete to flow in the inner circumferential direction of the slide center, a branch pipe section that branches off from the main pipe section and causes the concrete to flow toward a concrete pouring port of the slide center, and a switching member that switches the flow direction of the concrete to either the main pipe section side or the branch pipe section side at a branching portion between the main pipe section and the branch pipe section. Pressure pipe unit.

2. the main pipe portion includes a first main pipe portion upstream of the branching portion and a second main pipe portion downstream of the branching portion, 2. The pressure-feeding pipe unit according to claim 1, wherein the second main pipe section is connected to the first main pipe section and is configured to be detachable from the first main pipe section.

3. The plurality of pressure pipes include The pressure pipe unit according to claim 1 , further comprising a flexible pipe that connects the plurality of pressure pipes and is configured to be freely bendable.

4. a portion of the main pipe downstream of the branched portion is located radially inward of the slide center relative to the branch pipe portion, The pressure pipe unit according to claim 1 , wherein the switching member does not block the flow of the concrete on the branch pipe side, but switches the flow of the concrete on the main pipe side to either blocking or guiding the flow of the concrete on the main pipe side.

5. The at least one branch pipe includes a ceiling branch pipe disposed in a ceiling portion of the slide center, 2. The pressure pipe unit according to claim 1, wherein the branch pipe section of the ceiling branch pipe further includes an opening / closing member that switches between blocking and guiding the flow of the concrete in the branch pipe section.

6. A method for pouring concrete using the pressure pipe unit according to any one of claims 1 to 5, A step of switching a switching member of a first branch pipe defined below to the branch pipe side and switching a switching member of a second branch pipe defined below to the main pipe side, and pouring the concrete from a first pouring port defined below; When the concrete is poured up to the height of the first pouring port, the step of pouring the concrete from a second pouring port defined below in a state where the switching member of the second branch pipe is switched to the branch pipe side; A method of casting comprising: First pour hole: A concrete pour hole located lower than the second pour hole. Second pour hole: A concrete pour hole located higher than the first pour hole First branch pipe: A branch pipe whose trunk is inserted into the first pouring hole Second branch pipe: A branch pipe whose trunk is inserted into the second pouring port

7. Slide center and A concrete pouring system comprising: a pressure pipe unit provided inside the slide center; The pressure pipe unit includes: a plurality of pressure pipes connected to each other along an inner circumference of the slide center; the plurality of pressure pipes includes at least one branch pipe; The branch pipe includes a main pipe section that causes concrete to flow in the inner circumferential direction of the slide center, a branch pipe section that branches off from the main pipe section and causes the concrete to flow toward a concrete pouring port of the slide center, and a switching member that switches the flow direction of the concrete to either the main pipe section side or the branch pipe side at a branching portion between the main pipe section and the branch pipe section. Pouring system.

8. A ceiling pressure pipe unit for flowing concrete to a ceiling portion on the tunnel entrance side of the slide center is further provided. The ceiling pressure pipe unit including the ceiling branch pipe is connected to the upstream side of the pressure pipe unit, The ceiling branch pipe includes a main pipe section that flows concrete to the pressure pipe unit, a branch pipe section that branches off from the main pipe section and flows the concrete to a ceiling pouring port on the wellhead side defined below, and a switching member for switching the flow direction of the concrete to either the main pipe section side or the branch pipe side at the branching portion between the main pipe section and the branch pipe section. A casting system according to claim 7. Concrete pouring hole on the tunnel entrance side ceiling: A concrete pouring hole on the ceiling part on the tunnel entrance side of the slide center.

Images