JP2022090740A - Conveyance mechanism and construction method - Google Patents

Abstract

To provide a conveying device capable of conveying a material even when there is no support structure above.SOLUTION: To provide a conveyance mechanism comprising a track part supported by a structural column and a conveyance device for conveying a material by traveling the track section.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transport mechanism and a construction method.

As a prior art, an electric hoist traveling on a rail fixed to the lower surface of a deck slab is disclosed as a transport device (Patent Document 1).

Japanese Unexamined Patent Publication No. 5-8991

In the above-mentioned conventional technique, when the work is performed in the construction area where there is no structure for supporting the rail above, the transport device cannot be installed. Therefore, it is necessary to use other transportation methods such as human power, and it is not possible to improve the efficiency of construction.

In view of the above problems, the present invention is to provide a transport device capable of transporting materials even when there is no support structure above.

In order to solve the above problems, the present invention provides, as one aspect, a transport mechanism including a track portion supported by a structural pillar and a transport device that travels on the track portion to transport materials.

According to the present invention, it is possible to provide a transport device that enables transport of materials even when there is no support structure above.

It is sectional drawing along the X-axis direction which shows the transport mechanism and structure which concerns on embodiment. It is a layout drawing of a transport mechanism and a structure which concerns on embodiment. It is a side view of the transport mechanism which concerns on embodiment. It is a top view of the transport mechanism which concerns on embodiment. FIG. 2 is a cross-sectional view of the transport mechanism according to the embodiment along the line VV. It is a partially enlarged view of FIG. It is an enlarged view of the vicinity of the hoist in the transport mechanism which concerns on embodiment, and shows (a) the side view by the X-axis direction view, and (b) the side view by the Y-axis direction view. FIG. 2 is a cross-sectional view of the transport mechanism according to the embodiment along the line VVV, showing a state after construction of the upper floor slab. It is sectional drawing of the transport mechanism which concerns on a modification. It is a side view of the transfer device which concerns on a modification.

The transport mechanism 1 according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 8. The transport mechanism 1 is installed inside the space S formed below the existing structure 9 having a pile foundation, and is mainly used for carrying in materials for constructing the structure 8.

The directions of the mechanisms, members, devices, etc. in the figure are defined as shown in FIG. 1 using horizontal X-axis and Y-axis orthogonal to each other. For parts, members, etc. that can be removed from the mechanism, device, etc., the direction is defined in the state of being assembled to the mechanism, device, etc.

The structure 8 has a pile 81 which is a cast-in-place pile and a structural pillar 82 extending vertically below the existing structure 9 provided with the pile 91. The structural Shinbashira 82 is a pillar supported by the pile 81, and the upper portion thereof extends upward from the upper portion of the pile 81. The structure 8 is a structure constructed by a reverse striking method, and after the construction of the structural pillar 82, an upper floor slab 83 (FIG. 8) supported and fixed to the upper end of the structural pillar 82 is constructed. The details of the structure and construction of the structure 8 will be described later.

The transport mechanism 1 is a mechanism for transporting materials necessary for the construction of the upper floor slab 83, and is installed above the structural pillar 82. As shown in FIGS. 1 and 2, the transport mechanism 1 includes a track portion 10 supported by the structural pillar 82 and a transport device 20 movably supported by the track portion 10.

As shown in FIGS. 3 and 4, the track portion 10 includes a support portion 11, a girder 12, and a rail 13.

The support portion 11 is a bundle material that supports the girder 12 and is assembled by joining a plurality of steel materials to each other. The lower portion of the support portion 11 is fixed to the upper end portion of the structural pillar 82, and the upper end portion fixes the girder 12. As the fixing method to the structural pillar 82 and the girder 12, any method such as bolt joining or welding joining may be adopted. Further, in the embodiment, the support portion 11 is composed of a plurality of angle steels, but members other than the angle steels may be used.

The girder 12 is a member that extends in the X-axis direction and supports the rail 13. The girder 12 is supported by the structural pillar 82 via the support portion 11 and is erected above the plurality of structural pillars 82. The lower portion of the girder 12 is fixed to the upper end portion of the support portion 11. The girder 12 has a vertical girder 12A, a horizontal girder 12B, and a pedestal 12C.

The vertical girder 12A and the horizontal girder 12B are steel materials extending in the X-axis direction and the Y-axis direction, respectively, and are joined to each other. Two vertical girders 12A are arranged in parallel so as to extend in the X-axis direction, and are fixed to the upper part of the support portion 11. A plurality of horizontal girders 12B are arranged at substantially equal intervals in the X-axis direction, and all of them are fixed to the lower part of the vertical girder 12A. As the joining method of the vertical girder 12A and the horizontal girder 12B, any method such as bolt joining or welding joining can be adopted.

Two pedestals 12C are laid in parallel on the upper part of the cross girder 12B. Specifically, the two pedestals 12C are fixed to the Y-axis direction ends of the cross girder 12B, respectively. The pedestals 12C are all H-shaped steels extending in the X-axis direction, and are installed so that the flanges are substantially horizontal. The pedestal 12C supports the rail 13 at the top of each.

Two rails 13 are laid in parallel on the upper surface of the pedestal 12C so as to extend in the X-axis direction. The rail 13 has a function of supporting the transport device 20 so as to be travelable and guiding the travel of the transport device 20 in the X-axis direction. Although rail steel is used for the rail 13 in this embodiment, H-shaped steel, I-shaped steel, or the like may be used.

As shown in FIGS. 3 to 7, the transport device 20 includes a carriage 21, a suspension girder 22, and a hoist 23.

The bogie 21 includes a main body portion 211 formed by assembling a shaped steel into a substantially rectangular parallelepiped shape, a roller 212, two motors 213 for driving the roller 212, and a lock mechanism 216 (FIGS. 3 to 6).

The rollers 212 are installed at a plurality of locations below the main body 211, and each is rotatably supported by the main body 211 (FIG. 3). The roller 212 has a flange and is arranged on the upper part of the rail 13. The roller 212 can roll on the rail 13.

As shown in FIGS. 3 and 4, the motor 213 is fixed to the lower part of the main body portion 211. The motor 213 can transmit the driving force to the roller 212 via a deceleration mechanism (not shown) and drive the motor 213 in rotation. As a result, the bogie 21 can travel on the rail 13.

The lock mechanism 216 is a member extending downward from the lower part of the main body portion 211, and the lower end portion thereof is located between the flanges of the pedestal 12C (FIG. 6). The lock mechanism 216 is provided at both ends of the main body 211 in the Y-axis direction. When the main body portion 211 is tilted, the lower end portion of the lock mechanism 216 comes into contact with the flange of the pedestal 12C. This prevents the dolly 21 from tipping over.

The suspension girder 22 includes two support members 221, a girder member 222, an upper roller 223, a lower roller 224, and two motors 225 (FIGS. 3 to 7). The hanging girder 22 corresponds to the arm portion in the present invention.

The support members 221 are all H-shaped steels extending in the Y-axis direction, and are fixed to the upper part of the main body portion 211 so that the flanges are substantially horizontal. The lower flange of the support member 221 supports the girder member 222.

The girder member 222 is a member formed by assembling a plurality of H-shaped steels extending in the X-axis direction and the Y-axis direction in a grid shape and joining them together. As shown in FIG. 4, the girder member 222 is formed in a substantially rectangular shape when viewed from above.

The upper roller 223 and the lower roller 224 are installed at three locations above the girder member 222 and at both ends and the central portion in the Y-axis direction, and each is rotatably supported by the girder member 222 (FIG. 6, FIG. 7). The upper roller 223 and the lower roller 224 hold the lower flange of the support member 221 up and down.

The motor 225 is installed in the vicinity of the upper roller 223 and above the girder member 222 (FIG. 7 (b)). The motor 225 is connected to the upper roller 223 via a reduction mechanism, and the upper roller 223 can be rotationally driven. When the motor 225 rotationally drives the upper roller 223, the upper roller 223 moves while rotating with respect to the support member 221, and the lower roller 224 also rolls with respect to the support member 221 following this. As a result, the girder member 222 can move in the Y-axis direction with respect to the support member 221. That is, the hanging girder 22 can be expanded and contracted in the Y-axis direction as shown by the white arrows in FIGS. 4 to 6 and 8.

The hoist 23 is arranged at a substantially central portion in the X-axis direction of the girder member 222 (FIG. 7 (b)). The hoist 23 is movably supported in the Y-axis direction with respect to the girder member 222, and includes a wire 231, a hook 232, a motor 233, a motor 234, and a roller 235 as shown in FIG. 7.

The hoist 23 can wind up and down the wire 231 by using the motor 233, and can move the hook 232 suspended from the wire 231 up and down. The material can be hung and held on the hook 232 either directly or via a wire rope or the like. The hook 232 corresponds to the holding portion in the present invention.

The motor 234 is installed in the vicinity of the roller 235 (FIG. 7). The motor 234 is connected to the roller 235 via a reduction mechanism, and the roller 235 can be rotationally driven. The roller 235 is arranged on the lower flange of the H-shaped steel constituting the girder member 222 (FIG. 7 (b)). The hoist 23 can travel between both ends of the girder member 222 in the Y-axis direction by rotationally driving the roller 235 using the motor 234.

<Process>
Using the transport mechanism 1 as an example of use, a process for constructing the structure 8 below the existing structure 9 will be described below.

(Installation of Shinbashira)
As the first step, the builder constructs the pile 81, which is a cast-in-place pile. First, an opening A is provided on the ground surface near the existing structure 9, and the lower part of the existing structure 9 is excavated. As a result, a space S for constructing the structure 8 and a ground surface G are formed below the existing structure 9 (FIG. 1).

Next, the builder constructs the pile 81 and the structural pillar 82. The structure and construction method of the pile 81 are appropriately selected according to the design conditions and the like. For example, the pile 81 may be made of reinforced concrete or steel pipe concrete. It is also possible to use the pile 81 as a steel pipe column and extend it upward to form a structural pillar 82. The structure of the structural column 82 is also appropriately selected, and examples thereof include steel columns, steel tube columns, columns of H-shaped steel, and steel columns in which H-shaped steel is assembled in a cross-shaped cross section. As an example, when the pile 81 is a cast-in-place pile made of reinforced concrete, the ground surface G is excavated, reinforcement is arranged in the excavation hole, the structural pillar 82 is built, and concrete is placed.

As a result of the construction, as shown in FIG. 1, the lower portion of the structural pillar 82 is fixed to the pile 81, and the upper portion of the structural pillar 82 protrudes upward from the ground surface G.

(Installation of transport mechanism)
As the next step, the builder installs the transport mechanism 1 according to the following procedure.

The builder erected the girder 12 above the Shinbashira 82. The girder 12 is installed below the existing structure 9 so as to pass between the piles 91 of the existing structure 9 and further below the opening A (FIG. 2). The transport mechanism 1 can be installed at a plurality of locations according to the size of the existing structure 9 and the shape of the work area. In this embodiment, as shown in FIG. 2, the transport mechanism 1 is installed at two places.

In the process of erection of the girder 12, the builder first assembles and fixes the support portion 11 on the top of the structural pillar 82 (FIGS. 3 and 4). Next, two vertical girders 12A are erected and fixed on the tops of the plurality of support portions 11, and then the horizontal girders 12B and the vertical girders 12A are assembled and joined to each other in a grid shape. In this way, as shown in FIGS. 3 and 4, the girder 12 is erected above the structural pillar 82.

The girder 12 may be erected by sequentially assembling the girder 12 above the support portion 11 as described above, or by installing the pre-assembled girder 12 on the upper part of the support portion 11. good. By using the horizontal girder 12B and the vertical girder 12A, the dolly 21 can be produced in a lightweight manner, and the installation workability and economy at the site can be improved.

Next, the builder lays the rail 13 on the upper part of the girder 12 and completes the assembly of the track portion 10. After laying the rail 13, the builder installs the transport device 20 on the rail 13. The installation of the transport device 20 may be performed by a method of installing the transport device 20 after assembly on the rail 13. Further, the transport device 20 may be installed by the method of sequentially assembling the carriage 21, the suspension girder 22, and the hoist 23 on the rail 13.

(Construction of upper floor slab)
Next, the builder constructs the upper floor slab 83. The materials necessary for constructing the upper floor slab 83 are carried in by the transport device 20. Specifically, the builder carries materials such as support 71, formwork 72 (FIGS. 5 and 6) and reinforcing bars from the opening A to the space S, and then uses the transport mechanism 1 to carry these materials. To the appropriate place. The unloading of the material to the space S is performed using, for example, a crane CR as shown in FIGS. 1 and 2.

When transporting materials, as shown in FIG. 5, the suspension girder 22 and the hoist 23 of the transport device 20 are expanded and contracted and moved in the Y-axis direction, and the hoist 23 winds and unwinds the wire 231. , Materials are unloaded and unloaded. Since the hanging girder 22 expands and contracts and the hoist 23 moves with respect to the girder member 222, the range in which the material can be unloaded and unloaded can be expanded. In addition, the hanging girder 22 can be shrunk during transportation to prevent interference with the pile 91 (right side of FIG. 5). The lock mechanism 216 prevents the transport device 20 from tipping over during unloading and unloading. Therefore, the transport device 20 has a high load performance as compared with a transport device without a lock mechanism.

The transport device 20 travels on the rail 13 and transports materials. Since the transport mechanism 1 is installed above the construction range of the upper floor slab 83, the material can be transported without interfering with the work such as bar arrangement work and formwork assembly. Since the track portion 10 is installed so as to pass below the opening A (FIGS. 1 and 2), the material carried in from the opening A can be easily unloaded and transported by the transport device 20. Is.

In the present embodiment, since the transport mechanism 1 is installed at two places, the builder divides the construction area into two work zones R1 and R2 centering on the place where the transport mechanism 1 is installed, and in the work zones R1 and R2. Construction can be done in parallel (Fig. 2). Therefore, the construction can be efficiently progressed.

As shown in FIGS. 3 and 4, the builder carries out the assembly of the support work 71 and the formwork 72, and the reinforcement arrangement. After that, concrete is placed and cured to construct the upper floor slab 83 (Fig. 8). The bucket may be conveyed by the conveying device 20 at the time of placing concrete.

After the construction of the upper floor slab 83, the transport device 20 is disassembled and carried out from the opening A. On the other hand, the ground below the upper deck 83 will be excavated, and the construction of the structure 8 under the upper deck 83 will be continued, including the construction of a new deck.

<Modification example>
In the embodiment, the two rails 13 laid on the upper part of the girder 12 are used as the tracks of the transport device 20. However, the present invention is not limited to such a configuration. As shown in FIG. 9, the monorail 13A may be used as the track and may be supported by the support portion 11A. If the rail 13 has a sufficient yield strength, the rail 13 may be directly mounted on the structural pillar 82.

In the embodiment, an assembly-type crane having a telescopic suspension girder 22 is used as the transport device 20, but other types of cranes such as a jib crane (FIG. 10) can also be used. Further, the structure may be such that there is no hanging girder 22 or jib, that is, the structure does not have an arm portion, and the material is directly placed and transported on the trolley 21.

In the embodiment, the structural pillar 82 supported the upper floor slab 83 at the upper end portion. The structure of the structure Shinbashira 82 is not limited to such a structure. Similar to the construction method and structure adopted in the general reverse striking method, in the region that does not interfere with the existing structure 9, it extends upward from the upper floor slab 83 and functions as a pillar, and can support and fix the floor slab. (Fig. 1, right side).

The upper floor slab 83 may have a structure other than the reinforced concrete structure, such as a steel frame structure or a reinforced steel frame concrete structure. The structure of the connection between the upper floor slab 83 and the structural pillar 82 is also appropriately selected according to the design conditions such as reinforced concrete and steel frame brackets.

<Effect>
In the above embodiment, the transport mechanism 1 includes a track portion 10 supported by the structural pillar 82, and a transport device 20 that travels on the track portion 10 to transport materials.

In the above configuration, the material can be efficiently transported by using the transport device 20, and the construction work can proceed. Without the transport mechanism 1, it is not possible to improve the efficiency of construction using other transport methods such as human power. On the other hand, in the above configuration, since the track portion 10 is supported by the structural pillar 82, a transport path can be secured even when there is no structure for supporting the track portion 10 above, and the construction can be efficiently progressed. It is possible.

In the above embodiment, at least a part of the track portion 10 is located below the existing structure 9 different from the structural pillar 82. Further, the track portion 10 is located between the piles 91 of the existing structure 9.

With the above configuration, it is possible to avoid interference with the existing structure 9 and efficiently transport the material below the existing structure 9. If there is no transport mechanism 1, it is necessary to proceed with formwork work from the farthest point from the opening A, which is the material entrance, whereas if the transport mechanism 1 is used, it is arbitrary along the track portion 10. Materials can be brought into the location and construction can be performed. It is possible to proceed with the construction at the same time regardless of the distance from the opening A in each of the construction zones R1 and R2, and it is possible to improve the construction efficiency and shorten the construction period. Even when the material entrance is limited in this way, it is possible to improve the efficiency of construction.

In the above embodiment, the track portion 10 is located above the structural pillar 82. Specifically, the structural pillar 82 supports the upper floor slab 83 at its upper end, and the track portion 10 is located above the structural pillar 82 and the upper floor slab 83.

In the above configuration, it does not interfere with the construction of the structure up to the upper end of the structural pillar 82. Therefore, the construction of the structure 8 such as the upper floor slab 83 can be efficiently progressed.

In the above embodiment, the track portion 10 has a rail 13 on which the transport device 20 travels, and a girder 12 composed of vertical girders 12A and horizontal girders 12B joined to each other.

In the above configuration, the lightweight girder 12 can be assembled with a simple configuration using the vertical girder 12A and the horizontal girder 12B. Therefore, the transport mechanism 1 can be easily installed. Installation workability and economy at the site are improved.

In the above embodiment, the transport device 20 includes a stretchable suspension girder 22, a wire 231 supported by the suspension girder 22, and a hook 232 suspended from the wire 231 which is a holding portion capable of holding materials. Have.

In the above configuration, the transport device 20 can be configured by a simple mechanism to be a device capable of holding and transporting materials. Since the suspension girder 22 can be expanded and contracted, the range in which the transport device 20 can be unloaded and unloaded can be expanded.

The construction method shown in the above embodiment includes a step of constructing a structural pillar 82, a step of installing a transport mechanism 1, a step of transporting materials using a transport device 20, and a structural pillar using the transported materials. It includes a step of constructing an upper floor slab 83 supported by the upper end portion of 82.

In the above construction method, the material can be efficiently transported by using the transport device 20, and the construction can proceed. Since the track portion 10 is supported by the structural pillar 82, it is possible to secure a transport path even when there is no structure for supporting the track portion 10 above, and it is possible to efficiently proceed with the construction.

1 Transport mechanism 10 Track section 20 Transport device 8 Structure 81 Pile 82 Structure Shinbashira 83 Upper floor slab 9 Existing structure 91 Pile

Claims (7)

The track part supported by the Shinbashira and
A transport mechanism including a transport device that travels on the track portion to transport materials. The transport mechanism according to claim 1, wherein at least a part of the track portion is located below an existing structure different from the structural pillar. The transport mechanism according to claim 1 or 2, wherein the track portion is located above the structural pillar. The structural pillar supports the deck at its upper end and
The transport mechanism according to claim 3, wherein the track portion is located above the structural pillar and the deck. The track portion is
The rail on which the transport device travels and
The transport mechanism according to any one of claims 1 to 4, further comprising a girder on which the rail is laid, which is composed of vertical girders and horizontal girders joined to each other. The transport device is
Stretchable arms and
The wire supported by the arm and
The transport mechanism according to any one of claims 1 to 5, further comprising a holding portion suspended from the wire and capable of holding a material. The process of constructing the above-mentioned Shinbashira and
The step of installing the transport mechanism according to any one of claims 1 to 6 and
The process of transporting materials using the transport device and
A construction method including a step of constructing a deck supported on the upper end of the structural pillar using the transported materials.

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