JP2020002528A - Concrete placement system and concrete placement method - Google Patents

Abstract

To provide a concrete placement device capable of reducing labor during construction and performing construction with high quality, and a concrete placement method for using this concrete placing device.SOLUTION: A concrete placement device 2 comprises a movable carriage 4 movable in the tunnel axis direction, a branch pipe 5 mounted on the movable carriage 4, a force-feed pipe 6 for connecting a concrete pump and the branch pipe 5, and a pair of left and right driving pipes 7, 7 extending from the branch pipe 5 and each pipe 7 has one end connected to the branch pipe 5 and the other end arranged on the side of the tunnel.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a concrete placing device and a concrete placing method using the same.

When placing secondary lining concrete or side wall concrete or the like in a tunnel, concrete is placed between a formwork provided in the tunnel and a tunnel inner wall surface. When casting concrete, it is common for an operator to cast concrete into the casting section while moving the casting pipe. However, when concrete is poured into the concrete section one side at a time, the concrete pressure acting on the form may cause the form to be eccentric. When the mold is eccentric, the dimensional accuracy may be reduced.
For this reason, a construction method in which eccentricity of the formwork is suppressed by driving concrete evenly in the left and right directions has been adopted.
For example, in Patent Literature 1, a plurality of pressure feed pipes each including a main pipe extending from a concrete pump in the tunnel axial direction and branch pipes branching from the main pipe to both sides in the tunnel width direction are arranged at different positions in the tunnel longitudinal direction. Thus, a construction method of simultaneously driving left and right concrete is disclosed.
Patent Document 2 discloses a construction method in which one end is connected to a concrete pump and the other end uses a pressure-feeding pipe branched into a large number, and each other end is connected to an opening of a formwork at different positions in front, rear, left and right. A construction method is disclosed in which concrete is simultaneously poured into a casting section from a plurality of locations.

JP-A-2015-067949 JP 2001-28094 A

In the construction method of Patent Literature 1, concrete is driven into each pumping pipe by operating a plurality of concrete pumps, but it takes time to control the plurality of concrete pumps. In addition, if a space for disposing a plurality of concrete pumps cannot be secured, it cannot be adopted.
Further, in the construction method of Patent Literature 2, since the end of the pressure-feeding pipe branched into a plurality of parts needs to be arranged at different positions by the workers, the preparation work is troublesome. Also, at the time of pouring concrete, it is necessary to monitor the driving situation at each end of the pressure feed pipe, and it is necessary to arrange a large number of workers.
The present invention is intended to solve the above problems, and can reduce the labor at the time of construction, and, and a concrete casting device that can be performed with high quality, It is an object of the present invention to propose a concrete placing method using the concrete placing device.

In order to solve the above-mentioned problems, a concrete casting device according to the present invention includes a movable carriage movable in a tunnel axial direction, a branch pipe mounted on the movable carriage, and a pressure feed pipe connecting a concrete pump and the branch pipe. And a pair of left and right driving pipes extending from the branch pipe. The casting pipe has one end connected to the branch pipe and the other end disposed on the tunnel side.
Further, the concrete casting method of the present invention is to cast concrete between the formwork and the inner peripheral surface of the tunnel using the concrete casting device. The concrete placing method includes a step of moving the movable trolley and a step of placing concrete at the left and right simultaneously.
According to the concrete placing device and the concrete placing method, concrete can be easily driven into a predetermined location by moving the movable cart. In addition, since concrete can be poured simultaneously on the left and right sides, the pressure acting on the formwork is uniform, and the formwork is hard to be eccentric. In addition, since concrete can be cast at two places on the left and right, construction can be performed with a relatively small number of people.

  In addition, if a plurality of the concrete placing devices are arranged at intervals in the tunnel axis direction, while the concrete poured by one concrete placing device is cured, the other concrete placing device is used. Can be typed. This makes it possible to efficiently perform concrete placement continuously in the tunnel axial direction, and thus to shorten the overall construction period.

It is preferable that the concrete casting apparatus has a length that is equal to or longer than the length of the casting section corresponding to one casting cycle, and includes a movable gantry movable in the axial direction of the tunnel. In this case, the mobile trolley may be moved on the mobile gantry. If such a concrete casting device is used, concrete can be continuously driven into the gap between the formwork having an open top and the inner peripheral surface of the tunnel by piping a casting pipe from above. In addition, since the movable gantry has a length equal to or longer than the length of the casting section, concrete can be spread over the entire casting section by moving the branch pipe on the movable gantry.
Further, the concrete placing device may include a movable form that is movable in a tunnel axial direction, and the movable trolley may move on the movable form. According to such a concrete placing device, the work in other sections can be performed in parallel with the concrete placing, similarly to the case where the movable gantry is provided. Further, since the movable mold can be moved in the tunnel axis direction, the labor required for assembling the mold can be reduced.
In addition, if a pair of left and right support arms for supporting the casting pipe are provided, the casting pipe can be easily moved. Preferably, the support arm includes a traveling wheel.

ADVANTAGE OF THE INVENTION According to the concrete casting apparatus and the concrete casting method of the present invention, by moving the movable trolley in the axial direction of the tunnel, the labor required for piping during concrete casting is reduced, and the concrete is poured into a predetermined location easily. And it can be done with a small number of people. In addition, since concrete can be simultaneously poured into the left and right through the branch pipe, the pressure acting on the formwork is uniform, and the formwork is hard to be eccentric. As a result, it is possible to perform concrete placing work in a tunnel pit with a simple configuration and high quality.
In addition, the concrete casting device of the present invention includes a movable gantry or a movable form having a length equal to or longer than a casting section length corresponding to one casting cycle, so that the moving on the movable gantry or movable form can be performed. The bogie makes it possible to spread concrete throughout the casting section. In addition, since the installation of the concrete placing device is completed by moving the movable gantry or the movable formwork, workability is further improved.
Furthermore, the concrete casting method of the present invention, by arranging a plurality of the concrete casting devices at intervals in the tunnel axial direction, during curing of the concrete poured by one concrete casting device, the other Concrete can be driven using the concrete placing device of the present invention, and the construction period can be further shortened.

It is sectional drawing of the tunnel which concerns on embodiment of this invention. It is a top view showing the concrete placing device concerning the embodiment. It is a side view which shows the concrete casting apparatus. It is a front view showing the concrete placing device. It is a top view which shows a moving truck and a branch pipe. It is a longitudinal section showing an outline of a concrete placing method.

In the present embodiment, when a road tunnel is constructed, a case will be described in which side walls 12, 12 for erection of a floor slab 11 are formed in a tunnel of a tunnel 1. As shown in FIG. 1, the tunnel 1 of the present embodiment is formed by a shield method and has a circular cross section. The side walls 12 are respectively formed on the left and right of the tunnel 1. The outer surface (ground side surface) of the side wall 12 is formed in an arc shape along the inner wall surface (surface of the lining 13) of the tunnel 1, and the inner side surface of the side wall 12 is formed substantially vertical. . At the corner inside the upper end of the side wall 12 (on the other side wall 12 side), a step 14 for placing the end of the floor slab 11 is formed. The shape of the attachment portion between the floor slab 11 and the side wall 12 is not limited. Further, the side surface of the side wall 12 does not necessarily have to be vertical, and may be inclined. The cross-sectional shape of the tunnel 1 is not limited to a circle.
The left and right side walls 12, 12 are formed using the concrete placing device 2 shown in FIGS. The concrete casting device 2 of the present embodiment includes at least a movable form 3, a movable carriage 4, a branch pipe 5, a pressure feeding pipe 6, and a casting pipe 7.

The movable form 3 is movable in the tunnel axial direction inside the tunnel of the tunnel 1. The movable formwork 3 has a length equal to or longer than the casting section length corresponding to one casting cycle.
The movable form 3 of the present embodiment travels on a rail 31 laid on the bottom surface of the tunnel 1 as shown in FIG. The movable form 3 does not necessarily need to travel on the rails 31 and may travel on the bottom surface of the tunnel 1 or on lining concrete.
The movable frame 3 includes a gantry 32, a support 33 for supporting the gantry 32, a plurality of wheels 34, 34,... Provided at a lower end of the support 33, and a weir plate 35. That is, the movable mold 3 is a movable gantry (movable gantry) provided with a mold.

The gantry 32 is formed by combining a lining plate receiver 321 and a plurality of lining plates 322 as shown in FIGS. 3 and 4. The lining plate receiver 321 is a member that supports the lining plate 322, and is formed by combining steel materials. In this embodiment, an H-section steel is used. The material forming the lining plate receiver 321 is not limited, and may be, for example, a channel steel. The lining plate 322 is laid on the lining plate receiver 321. The lining plate 322 is continuously laid back and forth and right and left, and covers the upper surface of the concrete placing device 2.
The configuration of the gantry 32 is not limited. For example, a steel plate may be laid instead of the lining plate 322. Further, the lining plate receiver 321 may be configured by a girder and a girder support. As shown in FIGS. 2 and 3, a traveling rail 41 of the movable trolley 4 is laid on the gantry 32 (the lining plate 322).

The support 33 supports the gantry 32 from below, as shown in FIGS. The column 33 is made of H-shaped steel, and stands upright with respect to the gantry 32. In addition, the material which comprises the support | pillar 33 is not limited, For example, channel steel etc. may be sufficient. In addition, the column 33 may be expandable and contractible (height can be adjusted). In this embodiment, a plurality of pairs (18 pairs in this embodiment) of a pair of right and left columns 33, 33 are arranged in the tunnel axial direction. The plurality of columns 33 arranged side by side in the tunnel axial direction are connected via connecting members 331 and 332 at the lower end and the upper part. The connecting members 331 and 332 are made of an H-shaped steel disposed along the tunnel axial direction. In the present embodiment, the six columns 33 are connected by a pair of connecting members 331 and 332. In addition, a connection beam 333 is suspended between the upper connection members 331 adjacent to each other in the tunnel cross direction. That is, in the present embodiment, the twelve columns 33 arranged in the front, rear, left, and right form the unit 300 via the connecting members 331, 332 and the connecting beam 333. The concrete placing device 2 of the present embodiment has three units 300. The connecting members 331 and 332 and the connecting beam 333 may be provided as needed.
As shown in FIG. 3, among the plurality of columns 33 constituting the same unit 300, columns 33 adjacent to each other in the tunnel axis direction are connected via diagonal members (braces) 334. Note that the diagonal member 334 may be provided as needed, and may be omitted.

  The wheels 34 are attached to the lower connecting member 332 and run on the rails 31 as shown in FIGS. 3 and 4. In the present embodiment, the wheels 34 are arranged with respect to one connecting member 332 at an interval in the front and rear. That is, for one unit 300, four wheels 34, 34,... The number and arrangement of the wheels 34 are not limited. When the connecting member 332 is omitted, the wheel 34 may be directly attached to the column 33.

  The weir plate 35 is a plate material that forms a form when the side wall 12 is formed. As shown in FIG. 4, the weir plate 35 of the present embodiment is supported from the back side by a mounting member 351 projecting from the column 33 toward the tunnel wall surface, and is suspended by the gantry 32 by the suspending member 352. I have. The weir plate 35 is installed along the inner side surface of the side wall 12 via the mounting member 351. The material constituting the weir plate 35 is not limited as long as it has sufficient proof stress against the pressure at the time of placing the concrete. For example, a steel plate or a wooden plate may be used. Further, a reinforcing material (rib or lattice-like member) for reinforcement may be provided on the back surface (the surface opposite to the concrete casting surface) of the weir plate 35. The attachment member 351 is made of a member that can expand and contract, and the length of the protrusion from the support 33 can be adjusted. That is, the weir plate 35 is provided on the column 33 so as to be able to advance and retreat. Note that the attachment member 351 does not necessarily need to be able to expand and contract, and the extension length from the support 33 may be adjusted by shifting the fixing position with the support 33. In addition, the weir plate 35 does not necessarily need to be able to advance and retreat with respect to the column 33.

The movable trolley 4 moves along the tunnel axis direction on the upper surface of the movable mold 3. As shown in FIG. 2, a branch pipe 5 is mounted on the movable carriage 4. The movable trolley 4 of the present embodiment travels on a traveling rail 41 laid on the upper surface of the movable form 3. As shown in FIG. 5, the movable trolley 4 includes a main body 42 and a pair of support arms 43, 43 extending right and left from the main body 42.
The main body 42 is formed by combining steel materials. The material forming the main body 42 is not limited, but may be made of, for example, an H-shaped steel or a channel steel. The main body portion 42 is formed of a frame member 421 formed by combining steel materials, two front and rear cross members 422 and 422 laid at the center of the frame member 421 in the tunnel axial direction, and a front cross member 422. Diagonal members 423 and 423 provided in an inverted V-shape on the front side. The branch pipe 5 mounted on the movable trolley 4 is mounted on the horizontal members 422 and 422 and the diagonal members 423 and 423 of the main body 42. As shown in FIG. 4, wheels 44 running on the running rail 41 are attached to the lower surface of the main body 42. The wheels 44 are respectively attached to corners of the frame member 421 of the main body 42. The number and arrangement of the wheels 44 are not limited.

The support arms 43 support the left and right casting pipes 7, 7 as shown in FIGS. The support arm 43 is formed by combining steel materials. The material forming the support arm 43 is not limited, but may be made of the same material as the main body 42. On the lower surface of the support arm 43, traveling wheels 431 and 431 that can travel on the upper surface of the movable mold frame 3 (the lining plate 323) are provided. The traveling wheel 431 is provided on the lower surface of the support arm 43 at the tip of the support arm 43. Note that the number and arrangement of the traveling wheels 431 are not limited. Further, the traveling wheels 431 may be omitted.
The movable cart 4 is connected to a wire (not shown) extending from the winch 45. The winch 45 is provided on one end side of the traveling rail 41 laid on the upper surface of the movable mold frame 3 as shown in FIG. The wire extended from the winch 45 is hung around a pulley (not shown) provided at the other end of the traveling rail 41 and is attached to the movable trolley 4. The movable trolley 4 travels back and forth on the upper surface (on the travel rail 41) of the movable mold 3 by operating the winch 45.

  As shown in FIG. 5, the branch pipe 5 is a pipe material interposed between one pressure feed pipe 6 and a pair of left and right driving pipes 7. That is, the branch pipe 5 has a Y-shape in plan view, and one first pipe 51 and two second pipes 52 are connected to each other. The first conduit 51 is mounted on the horizontal members 422 and 422 of the main body 42. Each second conduit 52 is mounted on the diagonal member 423 of the main body 42. In the present embodiment, the second conduit 52 is fixed to the diagonal member 423 via a jig (not shown). The branch pipe 5 is not limited to a Y-shape, but may be a T-shape. The second conduit 52 does not necessarily need to be fixed to the diagonal member 423. The branch pipe 5 distributes the concrete supplied to the first pipeline 51 via the pressure feeding pipe 6 to the left and right second pipelines 52, 52 connected to the left and right casting pipes 7, 7, respectively. The left and right second pipelines 52 have the same inner diameter, and the concrete supplied from the first pipeline 51 is equally distributed to each second pipeline 52. Although the branch pipe 5 of the present embodiment is formed of a steel pipe, the material forming the branch pipe 5 is not limited, and may be, for example, a vinyl chloride pipe or a flexible pipe. Is also good.

  The pressure feed pipe 6 is a pipe extending from the concrete pump P (see FIG. 6) to the branch pipe 5. That is, the pumping pipe 6 is a transport path for pumping concrete from the concrete pump P to the branch pipe 5. At least a part of the pressure feed pipe 6 of the present embodiment is configured by a flexible pipe. That is, the pressure feeding pipe 6 follows the movement of the movable carriage 4 by bending or extending the flexible pipe. The configuration of the pressure feeding pipe 6 is not limited, and for example, a flexible pipe and a straight pipe may be combined, or may be configured only with a flexible pipe. In the present embodiment, an oblique member 424 for mounting the pressure feed pipe 6 on the rear corner of the frame member 421 of the main body 42 of the movable carriage 4 is provided. Note that the diagonal members 424 may be formed as needed.

  The casting pipe 7 extends left and right from the branch pipe 5 (second pipes 52, 52). One end of the casting pipe 7 is connected to the branch pipe 5 (second pipe 52), and the other end of the casting pipe 7 is disposed between the mold and the inner peripheral surface of the tunnel 1 (tunnel side portion). Is established. That is, the casting pipe 7 is a pipe for driving the concrete pumped through the pumping pipe 6 and the branch pipe 5 into a predetermined position. The casting pipe 7 according to the present embodiment has a distal end portion 71 formed of a flexible pipe, and the position of the concrete discharge port 72 can be adjusted. The configuration of the casting pipe 7 is not limited, and may be, for example, a flexible pipe having the entire length. A gate valve (gate valve) 73 is formed at the base end (end on the branch pipe 5 side) of the casting pipe 7. The gate valve 73 is used, for example, when the position of the concrete discharge port 72 is adjusted by temporarily stopping the discharge of concrete, or when the left and right concrete pouring amounts are adjusted. The type of the valve installed in the casting pipe 7 is not limited. Further, the valve (the gate valve 73) may be provided as needed, and may be omitted.

Next, a method of constructing the side wall 12 using the concrete placing device 2 of the present embodiment will be described.
First, the concrete placing device 2 (movable form 3) is installed at a predetermined position. When moving the movable mold frame 3, a gap is secured between the weir plate 35 and the inner wall surface of the tunnel 1 by retracting the weir plate 35 toward the column 33. When the movable formwork 3 is installed at a predetermined position, the dam 35 is extended (the mounting member 351 is extended), and the lower end of the dam 35 is brought into contact with the inner wall surface of the tunnel 1. At this time, a member that shields a gap between the weir plate 35 and the inner wall surface of the tunnel 1 may be provided at the lower end of the weir plate 35. When the crest plate 35 is set at a predetermined position, a wedge form (not shown) is set on the front end (the front end and the rear end as necessary) of the crevice plate 35. When the assembling of the formwork is completed by installing the wife formwork, concrete is poured between the dam 35 (formwork) and the inner peripheral surface of the tunnel 1. Specifically, a step of moving the movable trolley 4 and a step of placing concrete on the left and right simultaneously on the movable form 3 are performed. The concrete is poured until the upper surface of the concrete reaches a predetermined height in a state where the movable cart 4 is stopped at a predetermined position. At this time, the casting pipe 7 is inserted between the dam 35 and the inner wall surface of the tunnel 1 from the opening on the upper surface of the formwork. When the upper surface of the concrete reaches a predetermined height, the concrete placement is temporarily suspended, the movable trolley 4 is moved, and the placement is resumed. In this way, by repeatedly pouring the concrete and moving the movable trolley 4, the concrete is poured over the entire length of the formwork (the dam 35). The method of placing concrete is not limited. For example, the concrete may be poured while the movable cart 4 is always moved back and forth.

In the present embodiment, as shown in FIG. 6, two concrete placing devices 2, 2 are disposed at intervals in the axial direction of the tunnel. Then, during the curing of one of concreting device 2 segment B ₂ were pouring utilizing concrete, by utilizing the other concreting device 2, for pouring the concrete of the section A _2. That is, the concrete period is shortened by alternately using one concrete placing device 2 and the other concrete placing device 2 to place concrete. The number of concrete placing devices 2 used when constructing the same tunnel 1 is not limited.

If the concrete casting device 2 of the present embodiment is used, the concrete can be easily driven into a predetermined location by moving the movable formwork 3. That is, since the movable trolley 4 can be moved to the predetermined position on the movable form 3 and concrete can be poured at two places on the left and right, construction can be performed on the predetermined section with a relatively small number of people. In addition, since the movable trolley 4 is used, the casting pipe 7 can be easily moved. Furthermore, since the casting pipe 7 is supported by the support arm 43, there is no need for the worker to carry it.
In addition, since the movable mold 3 is used, the labor required for assembling and removing the mold can be significantly reduced.
By using a plurality of concrete placing devices 2, concrete placing continuously in the axial direction of the tunnel can be efficiently performed, and the overall construction period can be shortened.
The movable form 3 has a gate shape with the support 33 and the gantry 32, and a space through which vehicles and the like can pass is formed between the gantry 32 and the bottom of the tunnel. It is possible to move back and forth between the concrete placing devices 2 during the work performed. Therefore, even during concrete placement, work in another construction section can proceed, and as a result, the construction period can be shortened.

As described above, the embodiments according to the present invention have been described, but the present invention is not limited to the above-described embodiments, and each of the above-described components can be appropriately changed without departing from the spirit of the present invention.
The target tunnel 1 is not limited to a road tunnel, and may be, for example, a railway tunnel.
The application of the side wall 12 formed by the concrete placing device 2 and the concrete placing method is not limited. Further, the members formed by the concrete placing device 2 and the concrete placing method are not limited to the side walls 12 in the tunnel 1, and may be, for example, lining concrete.
Although the concrete casting device 2 of the embodiment has the movable form 3 provided with the weir board 35 (form), the concrete placing device 2 does not necessarily need to have the movable form 3. Absent. That is, the concrete casting device 2 may have a length equal to or longer than the length of the casting section corresponding to one casting cycle, and may include a movable gantry movable in the tunnel axial direction. At this time, the mobile trolley 4 is provided so as to be movable on the mobile gantry. Also, the formwork is to be installed separately from the concrete casting device 2.
The concrete casting device 2 does not necessarily need to have the movable form 3 or the movable gantry.
Further, the wheels 44 of the movable form 3 (moving frame) may be connected to a power source such as a motor. That is, the concrete placing device 2 may be able to run by itself.
In the above-described embodiment, the mobile trolley 4 is moved using the winch 45. However, the moving means of the mobile trolley 4 is not limited. For example, a power source such as a motor may be used. Good, or may be moved manually.

DESCRIPTION OF SYMBOLS 1 Tunnel 11 Floor slab 12 Side wall 2 Concrete placing device 3 Moving form (moving stand)
REFERENCE SIGNS LIST 31 rail 32 gantry 33 support 34 wheel 35 dam 4 moving trolley 41 running rail 42 main body 43 support arm 44 wheel 45 winch 5 branch pipe 6 pressure feed pipe 7 casting pipe

Claims (6)

A movable carriage that can move in the tunnel axis direction,
A branch pipe mounted on the movable trolley,
A pressure feed pipe connecting the concrete pump and the branch pipe,
A pair of left and right casting pipes extending from the branch pipe, and a concrete casting device,
The concrete casting device is characterized in that one end of the casting pipe is connected to the branch pipe, and the other end is disposed on the side of the tunnel. Equipped with a movable base that can move in the tunnel axis direction,
The movable gantry has a length equal to or longer than a casting section length corresponding to one casting cycle,
The concrete placing device according to claim 1, wherein the movable trolley is movable on the movable gantry. Equipped with a movable formwork that can move in the tunnel axis direction,
The concrete placing device according to claim 1, wherein the movable trolley is movable on the movable form. The movable trolley includes a pair of left and right support arms that support the casting pipe,
4. The concrete placing device according to claim 1, wherein the support arm includes a traveling wheel. 5. A concrete placing method for placing concrete between a formwork and an inner peripheral surface of a tunnel by using the concrete placing device according to any one of claims 1 to 4,
A method for placing concrete, comprising a step of moving the movable trolley and a step of placing concrete left and right simultaneously. A plurality of the concrete casting devices are arranged at intervals in the tunnel axial direction,
The concrete casting method according to claim 5, wherein concrete is poured by alternately using one of the concrete placing devices and the other concrete placing device.

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