JP6752482B2 - Scaffolding platform for work - Google Patents

Description

The present invention relates to a work scaffold used for connecting cylinders, for example, a work scaffold suitable for assembling a shaft used in a caisson method.

For example, the caisson method is applied to construct large structures underwater or on soft ground. The caisson method is a method of constructing a structure by embedding a caisson, which is a large cylinder or box made of reinforced concrete or steel, in the ground. The caisson method includes an open caisson method and a pneumatic caisson method.

The open caisson method is a method in which a caisson is installed on the ground and the inside of the caisson is excavated by human power or an excavator while the caisson is subsided to construct a foundation structure. On the other hand, the pneumatic method is also called the submersible method, and uses a caisson in which the ceiling wall of the work room is provided above the cut at the lower end. This method is a method of constructing a foundation structure by sinking a caisson while performing excavation work with the underside of the ceiling wall of the work room as an airtight work room, and excavation work while sending compressed air to the work room to prevent inundation. It can be performed. When the amount of subsidence is deep, the upper caisson without the work room ceiling wall is added to the lower caisson as the excavation work progresses.

As described in Patent Document 1, a man shaft and a material shaft, that is, a connecting cylinder are attached to the upper side of the ceiling wall of the caisson work room. Man shafts are used to move workers back and forth between the ground and the work room, and material shafts are used to transport earth and sand excavated by workers and excavators to the ground.

Patent Document 2 describes a caisson method using a shaft having a double tubular structure in which a man shaft and a material shaft having a smaller diameter are coaxially combined, and between the man shaft and the material shaft. , A spiral staircase for workers is provided.

Japanese Unexamined Patent Publication No. 2004-183271 Japanese Unexamined Patent Publication No. 2006-291704

The man shaft and the material shaft described above have an inner diameter for the operator to move and guide the earth and sand, and are configured by connecting a plurality of cylinders, that is, shaft constituent cylinders. As described above, the man shaft and the material shaft are connected cylinders constructed by connecting a plurality of shaft constituent cylinders. When constructing a man shaft or material shaft in a caisson provided with a work ceiling wall, a plurality of shaft constituent cylinders are connected so that a man shaft or material shaft having a length corresponding to the vertical dimension of the caisson is constructed. Will be done. Further, when another caisson is added to the upper side of the lowermost caisson in order to sink the caisson deep into the ground, the shaft constituent cylinder of the man shaft and the material shaft is also connected to the uppermost shaft constituent cylinder.

In order to connect another shaft constituent cylinder to the upper side of the lower shaft constituent cylinder, a work scaffolding platform is required because the connecting work is performed by the operator. Conventionally, in order to perform this connection work, a work scaffolding platform is mounted on the work ceiling wall of the caisson, and the work scaffolding platform is made to stand on the floor surface of the work ceiling wall around the shaft. Is building. When the shaft is constructed close to the vertical wall of the caisson, the work scaffolding is also connected to the vertical wall.

For this reason, the work scaffolding platform is laid vertically along the man shaft and material shaft, and the work scaffolding platform becomes large, and the work after the installation work of the work scaffolding platform and the subsidence excavation work using the caisson is completed. It is not possible to easily remove the scaffolding platform. In addition, conventionally, the work scaffolding platform is a square frame body, and when the work scaffolding platform composed of the square frame body is arranged around the cylindrical man shaft or the material shaft, the work scaffolding platform and each of them are arranged. A gap is generated between the shaft and the shaft, and it is not possible to safely and easily connect the shaft constituent cylinders.

An object of the present invention is to improve the safety and workability of mounting work of a work scaffolding platform when constructing a connecting cylinder.

The work scaffolding platform of the present invention is used when a plurality of cylinders having a lower flange at the lower end and an upper flange at the upper end are connected in the vertical direction to construct a connecting cylinder. A first inner frame which is a work scaffolding platform and surrounds the cylinder through a gap in the cylinder, and a first extending outside the first inner frame along the first inner frame. A lower base with an outer frame, a second inner frame parallel to the first inner frame, and a second outer frame parallel to the first outer frame of the lower base. An upper base which is arranged above and is connected to the lower base by a connecting member to form a scaffolding base main body, and a cylinder provided on the upper base and the lower cylinder and the upper cylinder. A floor material on which an operator performing a connecting operation walks , a plurality of lower engaging members provided on the first inner frame so as to be retractable from the inner peripheral surface and engaged with the lower flange, and a second. A lower side that is provided so as to be freely retractable from the inner peripheral surface of the inner frame of the inner frame, has a plurality of upper engaging members that are abutted against the outer surface of the cylinder, and engages with the lower flange. The scaffolding base body is fastened to the cylinder by the engaging member and the upper engaging member that is abutted against the outer surface of the cylinder .

The work scaffolding platform has a scaffolding platform main body that is arranged so as to surround the tubular body and is attached to the lower flange of the tubular body. The scaffolding platform main body is provided with a flooring material for workers and is provided with a scaffolding platform. An engaging member that engages the main body with the cylinder is provided. As a result, the work scaffolding platform is attached to each cylinder, and when connecting a plurality of cylinders up and down, the worker who gets into the work scaffolding platform on the lower stage side sets the upper cylinder and the lower stage side. Can be connected to the cylinder. Since the work scaffolding platform is attached to the tubular body, it is not necessary to arrange the scaffolding platforms connected vertically around the connecting tubular body, and the tubular body can be easily connected. Therefore, it is possible to improve the workability of the work of attaching the work scaffolding platform when constructing the connecting cylinder. Moreover, since the work scaffolding platform can be mounted on the cylinder on the ground, the work of mounting the work scaffolding platform on the cylinder can be safely performed.

It is sectional drawing which shows an example of a caisson. It is a front view which shows the mounting work of the work scaffolding base to the shaft structure cylinder for constructing the man shaft and the material shaft shown in FIG. It is a perspective view which shows the scaffolding platform main body of the scaffolding platform for work. It is a front view which shows the state which the scaffolding stand and the handrail are attached to the shaft structure cylinder. It is a front view which shows the state which the shaft structure cylinder of the upper stage side is conveyed on the shaft structure cylinder body of a lower stage side. It is a front view which shows the state which connected the shaft structure cylinder of the upper stage side on the shaft structure cylinder body of a lower stage side. FIG. 6 is a view taken along the line AA in FIG. FIG. 6 is a view taken along the line BB in FIG. It is a perspective view which shows the state which the scaffolding base main body provided with a ladder is attached to the shaft structure cylinder. It is a top view which shows the scaffolding stand for work. (A) is a front view showing a state in which the handrail frame is assembled on the scaffolding base main body, and (B) is a front view showing a state in which the handrail having the handrail frame is assembled on the scaffolding base main body. It is a perspective view which shows the state which the work scaffolding stand was assembled by assembling the ladder and the handrail to the scaffolding stand main body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the caisson 10 has left and right vertical walls 11 and 12 and a work room ceiling wall 13 above the cut end of the lower end, each of which is a box body extending in the direction perpendicular to the paper surface. Both ends of the box are closed. FIG. 1 shows a state in which the caisson 10 is subsided in the ground A. A work space, that is, a work room 14 is formed under the ceiling wall 13 of the work room, and a worker or an excavator enters the work room 14 to excavate earth and sand, and the caisson 10 is carried out as the excavation work progresses. Is sunk.

A man shaft 15 and a material shaft 16 are attached to the upper side of the work room ceiling wall 13. The man shaft 15 is used for workers to move back and forth between the ground surface B and the work room 14, and a man lock 21 is provided at the upper end of the man shaft 15 for workers to stand by. A ladder 22 for going up and down between the waiting room and the working room 14 in the man lock 21 is provided on the man shaft 15. In addition, there is a form in which a spiral staircase is provided on the man shaft 15 instead of the ladder 22, and a form in which an elevator is provided on the man shaft 15 when the man shaft 15 is long.

Further, the material shaft 16 is used to guide the earth and sand when the earth and sand excavated by the worker or the excavator is conveyed to the ground surface B, and the earth and sand bucket 23 is hung vertically by the wire 24 inside. Can be lowered. The wire 24 is moved up and down by a crane or the like (not shown). An air supply pipe 25 is attached to the ceiling wall 13 of the work room in order to supply compressed air into the work room 14 from the ground side. The man shaft 15, the material shaft 16, and the like are attached to the caisson 10 in advance before the caisson method is performed. A method of constructing a structure in the ground using such a caisson 10 is called a pneumatic caisson method.

By excavating the earth and sand of the work room 14 and subsided the caisson 10 from the ground surface B to a predetermined depth, the caisson 10 constructs a foundation structure such as a tunnel in the ground. When the caisson 10 is subsided deeper so that the caisson 10 shown in FIG. 1 is below the ground surface, another upper caisson is added to the upper side of the caisson 10.

The man shaft 15 and the material shaft 16 are constructed by connecting a plurality of cylinders having a predetermined length, that is, the shaft constituent cylinders 30. The number of shaft constituent cylinders 30 constituting the man shaft 15 and the material shaft 16 is set according to the scale of the structure. By connecting the shaft constituent cylinders 30, the man shaft 15 and the material shaft 16, that is, the connecting cylinders are constructed.

2 and 4 to 8 show a man shaft 15 and a material shaft 16, that is, a shaft constituent cylinder 30 for constructing a connecting cylinder. The man shaft 15 and the material shaft 16 shown in FIG. 1 are formed by connecting a plurality of shaft-constituting cylinders 30 which are cylinders even if the cross-sectional shapes are substantially circular and the diameters are different from each other. The basic structure is the same.

As shown in FIG. 2, a lower flange 31 is provided at the lower end of the shaft constituent cylinder 30, an upper flange 32 is provided at the upper end, and the lower flange 31 and the upper flange 32 are shaft constituent cylinders. It protrudes outward in the radial direction of 30. A plurality of ribs 33 are fixed to the lower end of the outer peripheral surface of the shaft constituent cylinder 30, and the lower flange 31 is fixed to the lower end of the shaft constituent cylinder 30 by the ribs 33. Each rib 33 projects outward in the radial direction and extends in the vertical direction along the shaft constituent cylinder 30. Similarly, a plurality of ribs 34 are fixed to the upper end of the outer peripheral surface of the shaft constituent cylinder 30, and the upper flange 32 is fixed to the upper end of the shaft constituent cylinder 30 by the ribs 34. Since the connecting cylinder formed by connecting the shaft constituent cylinders 30 is vertically attached to the working room ceiling wall 13 of the caisson 10, the lower and upper ends of the shaft constituent cylinders 30 are the working room ceiling wall 13. Indicates the vertical position when attached to.

As shown in FIG. 7, the lower flange 31 is provided with a plurality of through holes 35, and the upper flange 32 is also provided with a similar through hole 35. Further, as shown in FIG. 2, the rib 33 for fixing the lower flange 31 to the shaft constituent cylinder 30 is provided with a mounting hole 36, and the upper flange 32 is fixed to the shaft constituent cylinder 30. Similarly, the rib 34 is also provided with a mounting hole 36.

FIG. 2 is a front view showing the work of attaching the work scaffolding base 40 to the shaft configuration cylinder 30 for constructing the man shaft 15 and the material shaft 16, and FIG. 3 shows the scaffolding base main body of the work scaffolding base. It is a perspective view.

The shaft constituent cylinder 30 is arranged on the ground surface B at a position away from the caisson 10 via the support member C. Under this state, the work scaffolding platform 40 is conveyed to the shaft constituent cylinder 30. The work scaffolding base 40 has a scaffolding base main body 43 including a lower base 41 and an upper base 42. As shown in FIG. 8, the lower base 41 has an annular first inner frame 44 having an inner diameter larger than the outer diameter of the lower flange 31 and the upper flange 32, and an inner frame outside the inner frame 44. It includes a first outer frame 45 extending along 44 and is substantially circular in plan view. As shown in FIG. 7, the upper base 42 includes a second inner frame 46 and a second outer frame 47, and the second inner frame 46 has substantially the same diameter as the first inner frame 44. The second outer frame 47 has substantially the same diameter as the first outer frame 45.

The first inner frame 44 and the second inner frame 46 are connected by a plurality of vertical rod-shaped connecting members 48 shown in FIGS. 2 and 3, and the first outer frame 45 and the second outer frame 47 are connected. Is also connected by a plurality of vertical rod-shaped connecting members 49. The first outer frame 45 and the second outer frame 47 are connected by an inclined connecting member 50. As shown in FIG. 7, the second inner frame 46 and the second outer frame 47 are connected by a plurality of rod-shaped connecting members 51 in the radial direction. A floor material 52 made of expanded metal or the like is provided on the upper surface of the upper base 42 provided with the inner frame 46, the outer frame 47, and the connecting member 51. The radial width dimension of the floor material 52, that is, the radial distance dimension between the inner frame 46 and the outer frame 47 is set to a dimension that allows the worker P to smoothly perform the connecting work. Each of the outer frames 45 and 47 has a substantially circular shape concentric with the substantially circular shaft configuration cylinder 30, but the respective outer frames 45 and 47 can be made of any shape such as an ellipse, an oval, and a polygon. It can be shaped.

The upper base 42 includes a plurality of connecting members 51 in addition to the inner frame 46 and the outer frame 47, and has sufficient strength for the worker P to perform the connecting work, and is therefore shown in FIG. As described above, the lower base 41 is not provided with the connecting rod member, but the connecting member 51 may be provided on the lower base 41. As shown in FIG. 8, a rod-shaped engaging member 53 is movably mounted on the lower base 41 in the radial direction, and each engaging member 53 is fixed to the lower base 41. It is slidably housed in a sheath tube, that is, a sleeve 54, and can freely appear and disappear toward the shaft-constituting cylinder 30 as a cylinder. Similarly, as shown in FIG. 7, a rod-shaped engaging member 53a is movably mounted on the upper base 42 in the radial direction, and each engaging member 53a is fixed to the upper base 42. It is slidably housed in the sheath tube, that is, the sleeve 54, and can freely appear and disappear toward the shaft-constituting cylinder 30 as a cylinder.

Six of the engaging members 53 and 53a are provided at equal intervals in the circumferential direction of the scaffolding base main body 43. However, the number of engaging members 53 is not limited to six, and any number can be used as long as it is at least three. Further, the scaffolding base main body 43 is formed by assembling two semicircular main body forming members so that the scaffolding base main body 43 can be easily assembled. However, the scaffolding base main body 43 may be formed by assembling more than the main body forming member, not limited to the two divisions.

In FIG. 2, the engaging members 53 and 53a are moved to project outward in the radial direction, and the inner ends of the engaging members 53 and 53a are retracted to or equal to the inner peripheral surfaces of the inner frames 44 and 46, respectively. Indicates the state. Under this state, the scaffolding base main body 43 is suspended by a wire 24a of a crane (not shown) and conveyed toward the shaft constituent cylinder 30. The scaffolding base main body 43 is suspended from the wire 24a and arranged outside the shaft constituent cylinder 30. At this time, both inner frames 44 and 46 of the scaffolding base main body 43 have a larger diameter than the upper flange 32 and surround the shaft constituent cylinder 30 with a gap, so that the scaffolding base main body 43 is surrounded by the shaft constituent cylinder 30. The scaffolding base main body 43 can be easily arranged outside the shaft constituent cylinder 30 without colliding with the upper flange 32 or the upper flange 32. Moreover, since the scaffolding base main body 43 can be mounted on the shaft-constituting cylinder 30 arranged on the ground surface B, the mounting work can be performed safely.

FIG. 4 shows a state in which the scaffolding base main body 43 is fixed on the lower flange 31 of the shaft constituent cylinder 30. Before the scaffolding base body 43 is fixed to the lower flange 31, each engaging member 53 has an inner peripheral surface of the first inner frame 44 toward the shaft constituent cylinder 30, as shown in FIG. It is projected and moved from. Therefore, when the scaffolding base body 43 is moved to the lowering limit position shown in FIG. 4 with respect to the shaft configuration cylinder 30, the engaging member 53 engages with the lower flange 31, and the scaffolding base main body 43 has a shaft configuration. It is fixed to the cylinder 30. Further, as shown in FIG. 4, each engaging member 53a is projected and moved from the inner peripheral surface of the second inner frame 46 toward the shaft constituent cylinder 30. As a result, the lower engaging member 53 is fixed to the lower flange 31. Further, the upper engaging member 53a abuts or abuts on the outer surface of the shaft constituent cylinder 30. In this way, when the scaffolding base body 43 is fastened by the upper and lower two-stage engaging members 53, 53a, the scaffolding base main body 43 is fastened to the shaft constituent cylinder 30 only by the lower engaging member 53. However, the scaffolding base main body 43 is fastened more firmly. The engaging member 53 shown in the figure has a structure in which it contacts the lower flange 31, but a slit may be provided at the tip of each engaging member 53 so that the rib 33 can be inserted into the slit.

As shown by the broken line in FIG. 4, the handrail 55 is attached to the outer peripheral portion of the scaffolding base main body 43. The handrail 55 is detachable from the scaffolding base body 43, and the scaffolding base body 43 is attached to the shaft constituent cylinder 30 as shown in FIG. 4 when the handrail 55 is attached to the scaffolding base main body 43. It is done under the condition. As a result, when the scaffolding base main body 43 is suspended from the shaft constituent cylinder 30 and conveyed, the handrail 55 is not attached to the shaft constituent cylinder 30, and the scaffolding base main body 43 is attached to the shaft constituent cylinder 30. The work can be done easily.

FIG. 9 is a perspective view showing a state in which the scaffolding base body provided with the ladder is mounted on the shaft constituent cylinder, and the ladder 38 is fixed to the inner frames 44 and 46, and the floor material 52 of the portion where the ladder 38 is provided. Is provided with an opening 39. In order to cover the opening 39, a hatch (not shown) is attached to the scaffolding base main body 43 so as to be openable and closable. By allowing the worker to pass through the opening 39 provided in the floor material 52 in this way, the worker can safely go up and down as compared with the form in which the ladder 38 is provided on the outer surface of the scaffolding platform main body 43. It can be carried out. Although the ladder 38 shown in FIG. 9 projects upward from the scaffolding platform main body 43, the ladder 38 may be attached to the scaffolding platform main body 43 so as to project downward.

FIG. 10 is a plan view showing the work scaffolding base 40, and a plurality of sheath pipes, that is, handrail receiving pipes 56 are provided on the upper base 42 of the scaffolding base main body 43 in order to support the handrail 55. Each handrail receiving pipe 56 is fixed to the outer surface of the outer frame 47 by welding or the like, and the scaffolding base main body 43 shown in FIG. 10 is provided with ten handrail receiving pipes 56. In FIG. 10, the handrail 55 is shown by a straight line for simplification.

The handrail 55 is attached to the scaffolding base main body 43 by alternately assembling the first handrail frame 57 and the second handrail frame 58 shown in FIG. 11 in the circumferential direction. The first handrail frame 57 has two connecting columns 61 and 62, which are attached to the handrail receiving pipe 56, respectively, and an upper rail 63 is provided between both connecting columns 61 and 62 parallel to each other. And the middle rail 64 are provided, and both connecting columns 61 and 62 are connected by the upper rail 63 and the middle rail 64. A skirting board 65, which is wider than the upper rail 63 and the middle rail 64, is attached to the lower end of the handrail frame 57 in order to prevent an object from falling from the floor material 52. A plurality of hooks 66 are attached to the respective connecting columns 61 and 62, and each hook 66 is provided with an attachment hole penetrating in the vertical direction.

The second handrail frame 58 includes auxiliary columns 67 and 68 parallel to each other, and both auxiliary columns 67 and 68 are attached with an upper rail 71, a middle rail 72, and a skirting board 73. .. Connecting pins 74 to be inserted into hooks 66 of the first handrail frame 57 are attached to both ends of the upper rail 71 and the middle rail 72. Therefore, as shown in FIG. 11 (A), the first handrail frame 57 is attached to the handrail receiving pipe 56 at intervals of the second handrail frame 58, and the first handrail frame 57 is located between the two first handrail frames 57. The handrail 55 can be assembled by arranging the handrail frame 58 of 2 and inserting the connecting pin 74 into the hook 66. FIG. 11 shows two first handrail frames 57 and one second handrail frame 58, with five first handrail frames 57 and five second handrail frames 58. As a result, the handrail 55 can be assembled.

FIG. 12 is a perspective view showing a state in which the work scaffolding platform 40 is assembled by assembling the ladder 38 and the handrail 55 to the scaffolding platform main body 43. The number of handrails 55 can be set to an arbitrary number according to the size of the scaffolding base main body 43, assuming that both handrail frames 57 and 58 have the same number. The handrail 55 is shown by a broken line in FIGS. 4 to 6 and a straight line in FIGS. 7 and 8, respectively, which are shown in a simplified manner.

As shown in FIG. 4, the scaffolding base main body 43 is attached to the shaft constituent cylinder 30, and the handrail 55 is attached to the scaffolding base main body 43, and the wire 24a is attached as shown in FIG. The shaft constituent cylinder 30 is connected to the upper side of the lower shaft constituent cylinder 30 (a) by a crane (not shown). The lower shaft configuration cylinder 30 (a) is already connected and fixed to the lower shaft configuration cylinder 30 (b).

For example, if the lowermost shaft configuration of the man shaft 15 shown in FIG. 1 is the shaft configuration cylinder 30 (b) shown in FIG. 5, the shaft configuration cylinder 30 (a) is already on the upper side thereof. In order to connect the shaft configuration cylinder 30 to the shaft configuration cylinder 30 (a), FIG. 5 shows the shaft configuration cylinder 30 being conveyed toward the shaft configuration cylinder 30 (a). Indicates the state. Assuming that the man shaft 15 shown in FIG. 1 is assembled by seven shaft constituent cylinders 30, seven shaft constituent cylinders 30 are sequentially connected to the work room ceiling wall 13 from the lower shaft constituent cylinder 30 to the upper shaft constituent cylinder 30. The man shaft 15 is assembled. When assembling the material shaft 16 by the shaft-constituting cylinder 30, a predetermined number of shaft-constituting cylinders 30 are connected to the ceiling wall 13 of the work room to assemble the material shaft 16.

FIG. 6 shows a state in which the shaft configuration cylinder 30 on the upper stage side is connected on the shaft configuration cylinder body 30 on the lower stage side.

In order to connect the upper shaft configuration cylinder 30 to the lower shaft configuration cylinder 30 (a), the upper flange 32 of the lower shaft configuration cylinder 30 (a) and the upper shaft configuration cylinder 30 are connected. The lower flange 31 of 30 is fastened with a bolt 75. The fastening work is manually performed by the worker P. At that time, the operator P penetrates the bolt 75 through the through hole 35 of the lower flange 31 and the upper flange 32 and screwes the nut 76 to the bolt 75 so that the shaft constituent cylinders 30 are vertically adjacent to each other. To concatenate. The worker P fastens both shaft constituent cylinders 30 by attaching bolts 75 at a plurality of places while walking on the floor material 52 of the work scaffolding platform 40. In FIG. 5, the shaft-constituting cylinder 30 (a) and the shaft-constituting cylinder 30 (b) on the lower stage side thereof are connected in the same manner. In addition, in FIGS. 1 and 5, reference numerals a and b are shown in parentheses in order to show the positional relationship between the upper and lower shaft constituent cylinders 30. Further, in FIGS. 7 and 8, the bolt 75 is not shown.

As described above, since the worker P who rides on the floor material 52 performs the connecting work of the shaft constituent cylinder 30 above the work scaffolding base 40 provided with the floor material 52, the operation of the worker P The position of the upper base 42 with respect to the lower base 41 is set in consideration of the property. When the worker P transfers from the lower work scaffolding platform 40 to the upper working scaffolding platform 40, a ladder 38 arranged between the vertically adjacent work scaffolding platforms 40 is used.

In this way, since the work scaffolding platform 40 is preliminarily attached to each of the shaft constituent cylinders 30, the scaffolding platform can be installed on the work room ceiling wall 13 or one of the vertical walls 11 and 12 as in the conventional case. There is no need to install scaffolding pedestals in the ceiling and to sequentially stack the scaffolding pedestals as the shaft constituent cylinders 30 are connected. As a result, the work of mounting the work scaffolding base 40 for constructing the man shaft 15 and the material shaft 16 as the connecting cylinder can be easily performed.

When removing the man shaft 15 and the material shaft 16 from the caisson 10, an operator gets into the work scaffolding base 40 of the shaft configuration cylinder 30 on the lower side of the uppermost shaft configuration cylinder 30 and removes the bolt 75. Perform the operation. In this way, when the upper and lower shaft constituent cylinders 30 are released from the fastening, the uppermost shaft constituent cylinder 30 is carried out of the caseon 10 by a crane, and the handrail 55 and the scaffolding stand are carried out from the shaft constituent cylinder 30. Perform the removal work with the main body 43. The ladder 38 is used when the worker descends to the shaft configuration cylinder 30 on the lower stage side. Since the shaft-constituting cylinder 30 in the state where the work scaffolding platform 40 is assembled can be transported to the outside from the caisson 10, the shaft-constituting cylinder 30 can be quickly transported to the outside. Since the work scaffolding base 40 can be removed from the shaft configuration cylinder 30 on the ground, the removal work can be safely performed. Further, other work on the caisson 10 after removing the man shaft 15 and the material shaft 16 can be started quickly.

In this way, it is possible to efficiently construct the foundation structure using the caisson method, and the work of mounting the work scaffolding base 40 when constructing the connecting cylinders such as the man shaft 15 and the material shaft 16. Properties and shaft configuration It is possible to improve the workability of removing the work scaffolding base 40 from the tubular body 30.

FIG. 1 shows a caseon 10 having a man shaft 15 and a material shaft 16, and a work scaffolding platform 40 is attached to both shafts, that is, a shaft configuration cylinder 30 of a connecting cylinder, but at least one of the shafts is configured. The work scaffolding base 40 can be attached to the shaft configuration cylinder 30. Further, the scaffolding platform 40 for work can be applied not only to the caisson method but also to the case of connecting the cylinders to assemble the connected cylinders. Further, the man shaft 15 and the material shaft 16 are not limited to having a substantially circular cross section, and can be connected to any shape such as an ellipse, a quadrangle, or a polygon by using the work scaffolding platform 40. It can be performed.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof. For example, as described in Patent Document 2, even when the man shaft and the material shaft have a double tubular structure, the work scaffolding platform 40 can be mounted on the outer shaft.

10 Cason 13 Work room Ceiling wall 14 Work room 15 Man shaft 16 Material shaft 22 Ladder 23 Earth and sand bucket 30 Shaft configuration Cylinder 31 Lower flange 32 Upper flange 35 Through hole 36 Mounting hole 40 Work scaffolding base 41 Lower base 42 Upper base 43 Scaffolding base body 44 First inner frame 45 First outer frame 46 Second inner frame 47 Second outer frame 52 Floor material 53, 53a Engagement member 54 Sleeve 55 Handrail 56 Handrail receiving pipe 57 1 handrail frame 58 2nd handrail frame 66 hook 74 connecting pin 75 bolt

Claims (5)

A work scaffolding platform used when constructing a connecting cylinder by connecting a plurality of cylinders having a lower flange at the lower end and an upper flange at the upper end in the vertical direction.
A lower group comprising a first inner frame that surrounds the cylinder through a gap and a first outer frame that extends outside the first inner frame along the first inner frame. With a stand
A second inner frame parallel to the first inner frame and a second outer frame parallel to the first outer frame are provided and arranged above the lower base to the lower base. The upper base, which is connected by connecting members to form the scaffolding base body,
A flooring material provided on the upper base and on which an operator who performs a connecting operation between the lower cylinder and the upper cylinder walks.
A plurality of lower engaging members that are provided on the first inner frame so as to be retractable from the inner peripheral surface and engage with the lower flange.
It has a plurality of upper engaging members that are provided so as to be freely retractable from the inner peripheral surface of the second inner frame and are abutted against the outer surface of the tubular body.
The scaffolding base body is fastened to the cylinder by the lower engaging member that engages with the lower flange and the upper engaging member that is abutted against the outer surface of the cylinder. Scaffolding platform for work. The work scaffolding platform according to claim 1, wherein a plurality of handrail receiving pipes are provided on the outer peripheral portion of the scaffolding platform main body, and the handrails are detachably provided on the handrail receiving pipes . In the work scaffolding platform according to claim 2, the scaffolding platform is arranged between a plurality of first handrail frames each having two connecting columns attached to the handrail receiving pipe and the two first handrail frames. A work scaffolding platform for assembling the handrail with a plurality of second handrail frames . In the work scaffolding platform according to any one of claims 1 to 3, the connecting cylinder is mounted on the upper side of the ceiling wall of the work room of the caisson and guides the man shaft on which the worker goes up and down and the earth and sand to the ground. A scaffolding platform for work, which is at least one of the material shafts to be used, and the cylinder is a shaft-constituting cylinder constituting the man shaft and the material shaft. The work scaffolding platform according to any one of claims 1 to 3 , wherein the tubular body has a substantially circular cross section, and the scaffolding platform main body is substantially circular in a plan view.

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