JP5489940B2 - Working scaffold structure in shaft, construction method of working scaffold structure, and scaffold mounting structure - Google Patents

Description

  The present invention relates to a working scaffold structure in which a horizontal working scaffold is interposed between the lifting and lowering traps in a shaft including a spiral lifting and lowering trap attached to the inner wall of a shaft having a circular cross section constructed using a liner plate. In particular, the present invention relates to a working scaffold structure in a vertical shaft suitable for application to a drainage well for preventing landslides, a method for constructing a working scaffold structure, and a scaffold mounting structure.

Fig. 1 shows the general structure of a vertical shaft (collecting well) 1 constructed using a liner plate as a collecting well for collecting groundwater and flowing it to a river or the like in a place where landslides are likely to occur. The liner plate 2 as shown in FIG.
Fig. 2 (b) explains the installation situation of this type of drainage well 1. On the slope where landslides are likely to occur, the drainage well 1 having an inner diameter of 3.5m, etc., and a depth appropriate to the ground situation is installed. Then, a plurality of water collecting pipes 3 for collecting water are connected to the water collecting well 1 and one drain pipe 4 for flowing into a river or the like. The slip surface is indicated by a broken line 5.

  In the drainage well 1 having a circular cross section constructed using the liner plate 2, generally, a spiral elevating trap that extends from the upper end edge of the shaft to the vicinity of the bottom spirally along the inner wall is provided. The lifting trap schematically shown in FIG. In this kind of drainage well 1, when performing an inspection work such as whether the water collecting pipe 3 normally performs the water collecting function without clogging or the like, and when it is impossible to check from the lifting / lowering trap 6, the position of the water collecting pipe 3 Therefore, it is necessary to take measures such as providing a horizontal working scaffold.

As a conventional structure in which a working scaffold is provided in a shaft constructed of a liner plate, for example, there is a liner plate scaffold disclosed in Patent Document 1.
This liner plate scaffold has a structure in which a plurality of scaffold plates of the same size are connected to the inner wall in the circumferential direction to form an inward hook shape (FIGS. 7 and 8 of Patent Document 1).
In Patent Document 1, as shown in FIGS. 1 to 4, mounting holes 9 for receiving bolt heads or nuts joining the flange portions of the upper and lower liner plates to the arms 2 fixed to the scaffolding plate 1 are provided. The mounting member 3 having the mounting portion 4 is rotatably mounted, and the flange portions of the upper and lower liner plates bolted to each other are sandwiched between the mounting portion 4 of the mounting member 3 and the arm 2 on the scaffolding plate side. In this structure, the scaffolding plate is attached to the flange portion of the liner plate, and the scaffolding plate can be easily attached and detached.
In addition, this liner plate scaffold is applied in the deep foundation method as an example, and is used for the work of bar arrangement work when arranging bars at high positions starting from the bottom in a shaft made of liner plates. Used as a scaffold, repeated mounting and removal.

  In addition, “Patent Standing and Standing Scaffold Assembly / Removal Method” in Patent Document 2 is a method in which a working scaffold is provided in a shaft that is also constructed of a liner plate. The work scaffolding (two semicircular scaffolds 7 and the padding panel 9 in FIG. 1 of Patent Document 2) can be safely assembled and installed at a predetermined height position inside the shaft. . In Patent Document 2, the work scaffold can be engaged (hanged) on the inner wall side by simply hooking the claw portion provided on the peripheral edge of the work scaffold on the inner wall side of the shaft, and the work scaffold is simply a crane. It has a structure that can be removed by lifting it up.

JP 7-1111092 JP 2008-133596 A

The working scaffold (liner plate scaffold) of the above cited reference 1 is spirally raised and lowered as described in the embodiment applied to the deep foundation method in which concrete is filled inside after construction and is no longer a vertical shaft. It is not suitable for the work platform of a shaft with a trap. That is, in the case of a semi-permanent work scaffold for inspection work of the drainage well and the like, the attachment / detachment is not repeated, so that a special structure that is easily attached / detached as in the cited document 1 becomes useless and expensive. In addition, since a working scaffold having a completely different structure from that of the lifting and lowering trap is provided, the overall work becomes complicated and the cost increases.
In addition, a work scaffold that occupies the entire section of the shaft, such as the work scaffold of Cited Document 2, cannot be used as a semi-permanent work scaffold for inspection work of the drainage well.
In the case of the cited document 2, it is described in the embodiment applied to the drainage well, and therefore, it is assumed that the work scaffold is provided with a spiral staircase (helical lifting trap). Since a working scaffold having a completely different structure from the above is provided, the overall work becomes complicated and the cost increases.

  The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and works horizontally on a vertical shaft such as a drainage well equipped with a spiral lifting trap attached to the inner wall of a vertical cross-section shaft constructed using a liner plate. When installing a scaffolding, make the lifting and lowering traps and the work scaffolding common or related, so that the construction of the work scaffolding minimizes the complexity of the structure, and the construction is inexpensive and efficient. It is an object of the present invention to provide a working scaffold structure in a vertical shaft, a construction method for the working scaffold structure, and a scaffold mounting structure.

According to the first aspect of the present invention for solving the above-mentioned problem, a horizontal work scaffold is provided in the middle of the lifting and lowering trap in the shaft having a spiral lifting and lowering trap attached to the inner wall of the shaft having a circular cross section constructed using a liner plate. An intervening work scaffold structure,
The elevating trap has a plurality of short traps each having a plurality of steps extending toward the shaft center and having a substantially trapezoidal shape in plan view with two sides extending toward the shaft center when viewed from above. The trap is attached to the inner wall of the shaft in a spiral arrangement,
As the plurality of short traps, N types (N ≧ 3) having different side trapping angles of the substantially trapezoidal shape in plan view are used,
The working scaffold has N types of planar trapezoidal shapes in plan view, each having two side edges toward the shaft center when viewed from above and having side edge angles equal to the N kinds of side edge angles of the short trap. The N types of short scaffolds are connected in the horizontal direction and attached to the inner wall of the shaft.

  Claim 2 is the work scaffold structure according to claim 1, wherein one of the N types of short-sized traps of the lifting and lowering traps has a substantially trapezoidal shape in plan view having two sides as viewed from above all toward the shaft center. This is a short trap with a landing, in which a rectangular landing with two sides toward the center of the shaft is integrally provided at the lower end of the short trap structure.

  According to a third aspect of the present invention, in the work scaffold structure according to the first or second aspect, the upper first work scaffold and the lower second work scaffold having different installation height positions, and the first and second work scaffolds. And a lifting / lowering trap for connecting the two work scaffolds, and a total of the side sandwiching angles of the respective short scaffolds constituting the first work scaffold and each of the second work scaffolds. It is characterized in that the total of the short side scaffolding and the sum of the side sandwiching angles is 360 °.

  Claim 4 is the working scaffold structure according to any one of claims 1 to 3, wherein the vertical shaft is vertically attached with vertical reinforcing members at a plurality of locations spaced in the circumferential direction of the inner wall. A short scaffold having a notch for avoiding interference with the vertical reinforcing member is used as one of the N kinds of short scaffolds having a substantially trapezoidal shape in plan view.

  Claim 5 is the working scaffold structure according to claim 2, wherein the vertical shaft is provided with vertical reinforcing members vertically attached at a plurality of locations spaced in the circumferential direction of the inner wall of the shaft. Is arranged at the position of the vertical reinforcing member in a manner that does not interfere with the vertical reinforcing member, and as one of the N types of short scaffolds having a substantially trapezoidal shape in plan view, interference with the vertical reinforcing member It is characterized in that a short scaffold having a notch for avoiding is used.

  A sixth aspect of the present invention is the working scaffold structure according to any one of the first to fifth aspects, wherein the shaft is a catchment well.

The invention according to claim 7 constructs the working scaffold structure according to claim 3 for the existing shaft having a spiral existing lifting trap attached to the inner wall of the shaft having a circular cross section constructed by using the liner plate. A construction method of a working scaffolding structure,
The first one or more short scaffolds are formed in a manner adjacent to the lower end of the remaining upper raising / lowering trap that is removed from the inner wall of the middle one or more short traps of the spiral existing raising / lowering trap. A mode in which one end of the working scaffold is installed on the inner wall of the shaft, and the other end of the first working scaffold is adjacent to the upper end of the connecting lifting / lowering trap formed by using the one or more short traps removed. Then, a connecting lifting / lowering trap is installed on the inner wall of the shaft, and one end of the second working scaffold is installed on the inner shaft of the second working scaffold in a mode adjacent to the lower end of the connecting lifting / lowering trap. The shaft is characterized in that the other upper end of the remaining lower lifting trap is adjacent to the other end.

The invention of claim 8 is a scaffolding structure for attaching each short scaffold constituting the work scaffold to the inner wall of the shaft in the work scaffold structure in the shaft of any one of claims 1 to 7,
A short scaffold is fixed to the upper surface of the bracket with the base end attached to the inner wall of the shaft,
The bracket includes a horizontal member whose base end side is attached to the shaft inner wall and whose tip side extends in the shaft center direction, and whose upper end side is fixed to the tip end side of the horizontal member and the base end side is attached to the shaft inner wall below the base end side of the horizontal member. Made of diagonal material,
The mounting portion for attaching the base end side of the horizontal material or the diagonal material to the inner wall of the shaft,
A mounting member having a bolt hole with a downward projecting portion at the other end of the portion that is fixed to the base end side of the horizontal member or the diagonal member and extends horizontally to the shaft inner wall side;
A metal fitting that extends horizontally toward the inner wall of the shaft and has an upward projecting portion at its end and a bolt hole;
A horizontal T-shaped section formed by a horizontal portion and a vertical portion, and the horizontal portion includes a horizontal T-shaped member fixed to the flange with a bolt that joins the flanges of the upper and lower liner plates;
It is a structure in which the base end side of the horizontal member or the diagonal member is attached to the shaft inner wall by sandwiching the vertical portion of the laterally T-shaped member from above and below with the attachment member and the metal fitting, and tightening both attachment members with attachment bolts and nuts. It is characterized by that.

  According to a ninth aspect of the present invention, in the scaffold mounting structure according to the eighth aspect, the bracket is arranged at a central axis position of a side sandwich angle of the short scaffold.

  According to a tenth aspect of the present invention, in the scaffold mounting structure according to the eighth aspect, the brackets are arranged on both sides sandwiching the central axis position of the side sandwiching angle of the short scaffold.

  The eleventh aspect of the present invention is the scaffold mounting structure according to any one of the eighth to tenth aspects, wherein the height between the mounting member and the bracket is slightly smaller than the vertical dimension of the transverse T-shaped member. It is characterized in that a seat is interposed and tightened with a mounting bolt that passes through the spacer.

When installing multiple elongate traps on a shaft inner wall in a spiral arrangement and installing an elevating trap, the side trapping angle of the trapezoidal trapezoidal short trapezoidal plan view due to restrictions imposed by the structure of the shaft inner wall (outer structure) However, in order to improve the workability, it is desirable to reduce the types of short wraps (types of side sandwiching angles) as much as possible.
If only spiral elevating traps are used, by arranging multiple types of short traps in a combination of fixed patterns, the number of components (short traps) can be reduced as much as possible, and workability is also good. It is relatively easy to make.
However, for example, when installing a horizontal work scaffold in a drainage well, the location where the work scaffold is required is often case-by-case, so the structure for installing the work scaffold tends to be complicated. It is. In particular, it is not always easy to make a structure in which the spiral lifting / lowering trap and the horizontal work scaffold are smoothly connected, and the number of types of scaffold components is as small as possible and the workability is good.
However, in the present invention, the working scaffold is configured by connecting a short platform with a substantially trapezoidal shape in plan view, and the type of the side pinching angle of the short scaffold is defined as the type of the side pinching angle of the lifting trap as viewed from above. By making it the same, it is possible to obtain a working scaffold structure in which the spiral elevating trap and the horizontal work scaffold are smoothly connected, and there are few types of scaffold components (short scaffolds) and the workability is good. .

As will be described later, the present invention is particularly effective when applied to an existing shaft having only an elevating trap and no work scaffold, but it is also effective to adopt it to a new shaft.
That is, for example, in the method of installing a work scaffold using a plurality of scaffolding plates of the same size as in Patent Document 1, when installing a work scaffold in the middle of a lift trap in an existing shaft, It is difficult to leave most of the work as it is. On the other hand, if it is designed differently when installed in a new shaft and when installed in an existing shaft, the design itself becomes complicated, construction management also becomes complicated, and many unnecessary work increases, Workability is also lowered.
Considering that there are many cases where it is necessary to install a working scaffold in an existing shaft with an elevating trap, the effect of applying the present invention to a new shaft is sufficiently great.

  In the case of a vertical shaft using a liner plate, vertical reinforcing members may be provided at a plurality of positions in the circumferential direction of the inner wall of the vertical shaft. However, as in claims 4 and 5, the vertical reinforcing members have notches that avoid interference with the vertical reinforcing members. By using a short scaffold, it is not necessary to impair the workability of the work scaffold installation in such a shaft.

According to the third aspect of the present invention, the lifting and lowering traps on the upper side of the upper first work scaffold and the lifting and lowering traps on the lower side of the lower second working scaffold include the first and second work scaffolds. When it does not exist, it occupies most of the normal lifting and lowering traps that continue from the top of the shaft to the vicinity of the bottom (excluding the connecting lifting and lowering traps).
Therefore, even in the case of a shaft that requires a working scaffold, at least with respect to the lifting and lowering trap, it is possible to cope with a shaft that has only the lifting and lowering trap with a design with little change. Therefore, workability is also good, which is convenient in various respects including procurement of members.

According to the construction method of the working scaffold structure according to claim 7, when it is necessary to install a horizontal working scaffold in an existing shaft having only a spiral raising / lowering trap, all the existing lifting / falling traps are used. Thus, the work scaffold can be installed, and the construction when installing the work scaffold in the existing shaft having only the lifting and lowering traps can be extremely simplified, and the construction cost can be greatly reduced.
In that case, most of the existing lifting and lowering traps are used as they are and some of them are relocated, but the number of lifting and lowering traps to be transferred can be reduced as much as possible, so that the construction is simple and the construction cost can be greatly reduced.

According to the scaffold attachment structure of claim 8, the short scaffold is attached to the shaft inner wall with a bracket made of a horizontal material and an oblique material, and the attachment to the shaft inner wall can be realized with a simple and compact structure.
In addition, since the base end of the bracket is attached to the shaft inner wall using the bolts for joining the flange joints of the upper and lower liner plates, the bracket can be attached to the shaft inner wall with a simple and compact structure. it can.
For example, when mounting a bracket placed at the center line axis position of the side pinching angle of a short scaffold using the bolts for joining the flange joints of the upper and lower liner plates, The positional relationship in the vertical direction of the shaft is not constant, and a deviation occurs. However, since the vertical part of the lateral T-shaped member is sandwiched between the upper and lower mounting members on the bracket side and tightened with bolts, the upper and lower mounting members on the bracket side are arranged circumferentially with respect to the lateral T-shaped member. It can slide. Therefore, the short scaffold can be attached to an arbitrary place without being restricted by the position of the bolt for flange joining.

  According to the eleventh aspect of the present invention, since the structure is such that a bolt-shaped spacer is interposed between the mounting member and the metal fitting and the height is slightly smaller than the vertical dimension of the laterally-shaped T-shaped member, the bolt is tightened. Is realized.

BRIEF DESCRIPTION OF THE DRAWINGS The general structure of a drainage well which is a vertical shaft targeted in an embodiment of the present invention will be described. (A) is a sectional view of the drainage well and (b) is a plan view schematically shown. (A) is a perspective view which shows the structure of the liner plate used for the catchment well of FIG. 1, (b) is explanatory drawing of the installation condition of a catchment well. It is a figure for demonstrating the Example which constructs | assembles the working scaffold structure of this invention to the existing shaft (collection well) which has a raising / lowering lap | lap, It expands the inner wall surface of the existing shaft before constructing the work scaffold It is the inner wall surface development shown. It is a figure explaining the point which transfers a part of middle of a raising / lowering trap when constructing a working scaffold structure in the existing shaft of Drawing 3A. It is a figure explaining the shaft (collecting well) provided with the working scaffold structure of one Example of this invention which constructed | assembled the working scaffold structure in the existing shaft of FIG. 3A, and expanded and showed the inner wall surface of the shaft It is an inner wall surface development view. It is the top view which showed only the raising / lowering lap | lap | top and the work scaffold above the P position of FIG. 3C, and the work scaffold on the left side from the P position of the shaft which showed the inner wall surface development view in FIG. 3C. It is the top view which showed only the raising / lowering trap and the work scaffold of the shaft which showed the inner wall surface development view in FIG. 3C, the right side from the P position of FIG. 3C and the depth P position or less. Of the three types of short-sized traps constituting the lifting traps in the shaft, A-type short-sized traps are shown, (A) is a front view, (B) is a cross-sectional view taken along line A-A in (B), (C). (A) is a BB cross-sectional view of (a), (d) is a CC cross-sectional view of (a). Of the three types of short-sized traps constituting the lifting trap in the vertical shaft, B-type short-sized traps are shown, (A) is a front view, (B) is a cross-sectional view taken along DD of (A), and (C). (Ii) is an EE cross-sectional view of (a), and (d) is an FF cross-sectional view of (a). Of the three types of short-sized traps constituting the lifting trap in the vertical shaft, C-shaped short-sized traps are shown, (B) is a front view, (B) is a cross-sectional view taken along line D'-D 'in (B), C) is a cross-sectional view taken along the line E'-E 'of (a), and (d) is a cross-sectional view taken along the line F'-F' of (a). Of the three types of short scaffolds that constitute the work scaffolds in the shaft, the A 'type short scaffolds are shown, (A) is a plan view, (B) is a rear view of (A), and (C) is It is the figure seen diagonally from the right side of (a). Of the three types of short scaffolds that make up the working scaffold in the shaft, B 'type short scaffolds are shown, (A) is a plan view, (B) is a rear view of (A), and (C) is It is the figure seen diagonally from the right side of (a). Of the three types of short scaffolds that constitute the work scaffolds in the shaft, the c 'type short scaffolds are shown, (A) is a plan view, (B) is a rear view of (A), and (C) is It is the figure seen diagonally from the right side of (a). FIG. 5 is an enlarged view of a portion of one A-shaped short trap in FIG. 4 (however, the direction is changed, and a part of the attachment to the inner wall of the shaft is partially omitted). (A), (b), (c) is a figure explaining the pattern of the attachment part employ | adopted as the upper part and lower part of a short length trap when attaching an A-type short length trap to a shaft inner wall, respectively. An example of the attachment part which attaches a short length trap to a shaft inner wall is shown, (A) is a detailed view of an example of the attachment part about G part or G 'part of FIG. 12, (B) is H of (A). Sectional drawing (enlarged view of portion J in FIG. 13 (a)), (c) is a view showing an embodiment when the upper end of the column is attached to the inner wall of the shaft (enlarged view of portion K in FIG. 13 (a)). is there. It shows another example of a mounting part for attaching a short length tapping to the inner wall of a shaft, (A) is a detailed view of another example mounting part (however, the upper end part of the column) about G part or G 'part of FIG. (B) is a cross-sectional view taken along line H'-H 'in (A) (enlarged view of part M in FIG. 13 (C)), and (C) is a diagram showing an embodiment in which the lower end of the column is attached to the inner wall of the shaft ( FIG. 14 is an enlarged view of a portion N in FIG. It is a figure for demonstrating the structure which attaches a short scaffold to a shaft inner wall, and is equivalent to the figure which extracted a part of FIG. FIG. 17 shows an embodiment of a scaffold mounting structure for mounting a short scaffold to a vertical shaft inner wall, and is a cross-sectional view of FIG. 16, for example, the II cross section (the bracket width center line position cross section). (A) is a plan view showing only the horizontal member of the bracket in the scaffold attachment structure of FIG. 17, (B) is a plan view of the lower end portion of the diagonal member of the bracket and the attachment member fixed thereto. FIG. 18A is a plan view showing only the transverse T-shaped member in FIG. 17, and FIG. 18B is a side view of FIG. (A) is a plan view showing only the L-shaped bracket in FIG. 17, (B) is a side view of (A). According to the scaffold mounting structure described in FIGS. 16 to 20, it is a diagram illustrating that there is a degree of freedom in the mounting position of the bracket to the shaft inner wall (that is, the mounting position of the short scaffold to the shaft inner wall). It is a figure explaining the case where the position of a horizontal T-shaped member comes to the position of the end surface plate mutually joined of the liner plate adjacent to the circumferential direction. It is sectional drawing which shows the bolt junction part of the adjacent short scaffolds in FIG.

  Hereinafter, a working scaffold structure, a construction method for a working scaffold structure, and a scaffold mounting structure in a vertical shaft embodying the present invention will be described with reference to the drawings.

FIG. 1 illustrates a general structure of a drainage well 1 which is a vertical shaft targeted in an embodiment of the present invention. FIG. 1A is a longitudinal sectional view schematically showing the drainage well (vertical shaft) 1. (B) is a schematic plan view.
As described above, the drainage well 1 is a civil engineering structure provided to collect groundwater in a place where landslides are likely to occur and flow it to a river or the like. The circular well plate 2 shown in FIG. It is constructed by connecting in the direction and vertical direction. As shown in FIG. 2 (b), a plurality of water collecting pipes 3 for collecting water are connected to the water collecting well 1, and a single drain pipe 4 for flowing into a river or the like is connected. . The sliding surface 5 is indicated by a broken line.

The liner plate 2 has circumferential flanges 2b formed by bending steel plates at both ends in the corrugated direction of the arc-shaped corrugated steel plate portion 2a, and end plates of separate members are provided at both ends in the direction orthogonal to the corrugated direction. It has a vertical flange 2c fixed by welding. 2d shows the bolt hole for joining the circumferential flanges 2b of the liner plate 2 adjacent up and down.
A plurality of liner plates 2 are joined by bolting the vertical flanges 2c to form a ring, and the circumferential flanges 2b of the liner plates 2 adjacent to each other are bolted together to form a cylindrical shaft (collecting well) 1 Build up. In general, after assembling the top of the shaft (for the first 1 to 3 rings), backing and fixing the surrounding area, the drilling and assembly are repeated, and the liner plate is added to the bottom. Construct shaft 1
Further, normally, a reinforcing ring 7 made of an H-shaped steel having an arc shape like the liner plate 2 is interposed between the liner plates 2 adjacent to each other at an appropriate interval in the height direction. In this embodiment, vertical reinforcing members 8 made of H-shaped steel are provided at four locations spaced by 90 ° in the circumferential direction as reinforcing members in the vertical direction with respect to the liner plate.

FIG. 3C is an exploded view of the inner wall surface of the shaft (collecting well) 1 having the working scaffold structure according to the embodiment of the present invention, and FIG. 4 is an expanded view of the inner wall surface in FIG. 3C. FIG. 5 is a plan view showing only the lifting platform and the working scaffold above the P position and the working scaffold on the left side of the P position of the shaft 1, FIG. 5 is the lifting trap and the working at the right side from the P position and below the depth P position. It is the top view which showed only the scaffold.
This embodiment is provided with a spiral elevating trap 6 that extends from the upper end edge of the shaft to the vicinity of the bottom on the inner wall of the shaft, like an existing shaft (collection well) 1 ′ whose inner wall development is shown in FIG. 3A. This is a case where a horizontal work scaffold is constructed in the middle of an elevating trap for the existing shaft 1 'having no horizontal work scaffold.

The raising / lowering trap of the example of illustration has substantially three types of short type traps 11, 12, and 13 of A type, B type, and C type provided spirally.
The structure of the A-type short trap 11 is shown in FIG. FIG. 6 (a) is a front view of the short-sized trap 11. FIG. 6 (b) is a sectional view taken along the line AA in FIG. 6 (A), FIG. It is -C sectional drawing.
The main body 11a of the short turret 11 includes a vertical column 11b on the wall side and a vertical column 11b ′ on the vertical shaft center side, an inclined column 11c on the wall surface side whose upper ends are fixed to the vertical columns 11b and 11b ′, and a vertical column center side. In the illustrated example, the inclined column 11c ′ is fixed between the inclined columns 11c and 11c ′. In the illustrated example, the step 11d is a lower member that connects the vertical columns 11b and 11b ′ and the vicinity of the lower ends of the inclined columns 11c and 11c ′. 11e, 11e ′, and a lower end member 11f for connecting the lower ends of both vertical columns 11b, 11b ′.
An attachment member 14 for attaching the upper end of the short trap 11 to the wall surface is fixed to the upper end of the vertical column 11b on the wall surface side, and the lower end of the short trap 11 is respectively attached to the lower ends of the vertical column 11b and the inclined column 11c on the wall surface side. Attachment members 15 and 16 for attaching the lower end portion to the wall surface are fixed. Each attachment member 14, 15, 16 has bolt holes 14b, 15b, 16b for attachment, and has downward bent portions 14a, 15a, 16a at the tips.
A handrail 17 is attached to the inclined column 11c 'on the shaft side.
The wall-side lower member 11e is longer than the shaft center-side lower member 11e ', and the step 11d and the lower end member 11f are in the shaft center direction.
With the above configuration, the main body 11a of the short trap 11 has two sides of the same length in the illustrated example as viewed from above, as shown in FIGS. 6 (d), 4 and 5, etc. It has a pedestal shape.
The side nip angle of the two sides of the short trap 11 that forms an isosceles trapezoid when viewed from above is 20.25 °.

The structure of the B-shaped short trap 12 is shown in FIG. FIG. 7 (a) is a front view of the short tapping 12; (b) is a cross-sectional view taken along the line DD of (a); (c) is a cross-sectional view taken along the line EE of (a); It is -F sectional drawing.
The short trap 12 is different in size from the short trap 11 shown in FIG. 6 but has the same basic structure. That is, the main body 12a of the short tapping 12 includes a wall surface side vertical column 12b and a vertical shaft center side vertical column 12b ', a wall surface side inclined column 12c and a vertical shaft center side inclined column 12c', step 12d, and lower members 12e and 12e. The basic structure is the same, including a lower end member 12f and the like, and also including an attachment member 14 at the upper end, attachment members 15 and 16 at the lower end, a handrail 17, and the like.
However, the number of steps in step 12d is four and the height is short,
As seen from above, the short side trapping angle of this short trapezoid 12 that has an isosceles trapezoidal shape with two sides of the same length toward the shaft center is 13.5 °. The dimensions are different.

The structure of the C-shaped short trap 13 is shown in FIG. FIG. 8 (a) is a front view of the short trap 13, and FIG. 8 (b) is a sectional view taken along the line D'-D 'of FIG. 8 (A), FIG. It is F'-F 'sectional drawing of a).
The C-shaped short trap 13 has a structure in which a landing 18 is attached to the lower end of a B-shaped trap portion (short trap structure) 20.
The B-type trap portion 20 has almost the same structure as the B-type short trap 12 described with reference to FIG. 7, and the number of steps 12d is four, and each of them has an equal length of 2 toward the shaft center when viewed from above. The B-side trapping portion 20 having an isosceles trapezoidal shape with side edges has a side-side sandwiching angle of 13.5 °. However, the vertical struts 12b and 12b ′ are extended downward (lower extensions are indicated by m and m ′). Further, a lower end member 12g is fixed between the lower end portions of the inclined columns 12c and 12c ′.
The landing 18 has a plate 18b fixed to the upper surface of a trapezoidal frame 18a having two sides of the same length toward the center of the shaft, and the side surface of the trapezoidal frame 18a is welded to the B-shaped trapping portion 20 side, and a trapezoidal shape. The frame 18 a is supported by a support structure 19 provided at the lower part of the B-type trap portion 20. Note that the shape of the landing 18 is not necessarily a trapezoidal shape having two sides having the same length, but is a square.
The support structure 19 includes lower extensions m and m ′ of the vertical struts 12b and 12b ′ of the B-type trap portion 20, a lower end member 13f fixed between the lower ends of the lower extensions m and m ′, and the lower extension. The diagonal material 19a etc. which extend diagonally from the lower end part of the parts m and m 'are included. An attachment member 15 to the wall surface is also fixed to the lower end of the downward extension m. The side surface of the trapezoidal frame 18a is bolted to the lower end member 12g on the B-type trap portion 20 side.
The side sandwiching angle of the landing 18 viewed from above the trapezoidal frame 18a is 22.5 °, and when combined with the side sandwiching angle of the B-shaped trapping portion 20, it is 36 °.
3A, FIG. 3B, FIG. 3C, FIG. 4, FIG. 5, etc., the B-type trap portion 20 of the C-type short trap 13 is shown as b, and the landing 18 portion is shown as c (C type = “b + c” type).

As shown in FIGS. 3C, 4, and 5, the short trap 13 with the C-shaped landing is arranged corresponding to the position of the vertical reinforcing member 8, and the landing 18 is a vertical reinforcing member. 8 is provided in a manner that does not interfere with 8.
In the shaft having the vertical reinforcing member 8 as in the embodiment, in general, as a separation type trap for avoiding interference with the vertical reinforcing member 8 protruding from the inner surface of the shaft, the landing place as in the embodiment in the position of the vertical reinforcing member 8 A short tapping 13 is attached. Therefore, the position of the short trap 13 with the landing is determined in advance due to the presence of the vertical reinforcing member 8. For this reason, a horizontal work scaffold is usually connected from this landing, so when a work scaffold is installed in the middle of the lift trap, there is a restriction on the arrangement of the short traps for the lift trap below the work scaffold. There is a problem. As will be described later, the present invention does not cause such a restriction.

  3A and 3C, the shortest trap 11 at the uppermost part of the lifting and lowering trap is illustrated so as not to reach the upper end edge of the shaft for easy understanding of the present invention. Instead of the A-type short trap 11 itself described, the vertical struts 11b, 11b 'of the A-type short trap 11 are extended upward, and a plurality of steps 11d are fixed between the extended vertical struts to form a vertical trap. Is used so that it can be easily descended from the top edge of the shaft. When the uppermost short-length trap provided with the vertical trap on the A-type short-length trap 11 is regarded as another type, four types of short-length traps are used as the lifting and lowering traps.

It is provided with an existing shaft 1 'as shown in FIG. 3A, that is, with an existing elevating trap 6' in which three types of short traps 11, 12, and 13 of A, B, and C are spirally connected. A construction method in the case where a horizontal work scaffolding is provided in an existing shaft 1 'that does not have a suitable work scaffold will be described below.
In this embodiment, the openings of the plurality of water collecting pipes 3 on the wall surface of the vertical shaft (collecting well) 1 are in a positional relationship as shown in the figure with respect to the existing lifting trap 6 '. This is a case where a horizontal work scaffold for performing the inspection work is installed in the middle of the lifting trap so as to be smoothly connected to the lifting trap.
In the existing elevating trap 6 ', the short traps are installed in the order of A, A, B, C (= b + c), A, A, B, C (= b + c), A, A from the top.
In addition, since the side nip angle of each short lap is A = 20.25 °, B = b = 13.5 °, and c = 22.5 °, the side nip angle of A, A, B, C (= b + c) is The combined side edge angle is 20.25 x 2 + 13.5 x 2 + 22.5 = 90 °. When four combinations of A, A, B, and C (= b + c) are installed, it becomes 360 ° (1 round). The pattern is the same for each round of the spiral.
Of the existing elevating traps 6 ', in the example shown in the figure, three short traps A, A, B (upper C and lower C) in the vicinity of the height position of ten water collecting pipes 3 arranged horizontally. 3 short laps between the two are removed from the shaft inner wall. The three short traps that have been removed are shown shifted laterally in FIG. 3B (the three short traps to be removed are only described and not attached in that position).
Then, the upper A in the removed position is moved to the right in FIG. 3B by the width S corresponding to “A + A + B + C” from the original position in the circumferential direction as shown by the arrow (indicated by a two-dot chain line). Connect the removed B under A. The two short traps A and B serve as a connecting lifting trap 6B.
Further, the second A from above is lowered obliquely as shown by an arrow (indicated by a two-dot chain line) and connected to the lower C.

  The first working scaffold 41 installed between the upper end of the transferred lifting / lowering trap 6B and the lower end of the upper lifting / lowering trap 6A, and the lower end of the connecting lifting / lowering trap 6B and the lower lifting / lowering trap 6C. The structure of the short scaffold used for each second work scaffold 42 installed between the upper ends will be described.

Each of the two work scaffolds 41 and 42 corresponds to the three types of short traps 11, 12, and 13 of A, B, and C (= b + c) and corresponds to A ′ and B ′ ( = B ′), c ′, three kinds of short scaffolds 21, 22, and 23 are used.
The structure of the A′-type short scaffold 21 is shown in FIG. 9A is a plan view of the short scaffold 21, FIG. 9B is a view from the upper side of FIG. 9A (view from the inner wall side of the shaft), and FIG. 9C is an oblique view from the right side of FIG. FIG.
The structure of the B′-type short scaffold 22 is shown in FIG. 10 (a) is a plan view of the short scaffold 22, (b) is a view of (a) seen from the shaft inner wall side (upper side in the figure), and (c) is a view seen obliquely from the right side of (a). is there.
The structure of the c′-type short scaffold 23 is shown in FIG. 11 (a) is a plan view of the short scaffold 23, (b) is a view of (a) seen from the inner wall side (upper side in the figure), and (c) is a view seen obliquely from the right side of (a). is there.

That is, the short scaffold A ′ shown in FIG. 9 corresponds to the short trap A, and the short scaffold B ′ shown in FIG. For the short trap C with a landing, the short scaffold b ′ (= B ′) of FIG. 10 is used as the short scaffold corresponding to the B-shaped trap portion 20 shown by b, and corresponds to the landing 18 shown by c. A dedicated short scaffold c ′ shown in FIG. 11 is used as the short scaffold. That is, the short scaffolding b ′ (= B ′) and the short scaffolding c ′ are used corresponding to the short turlap C with a landing.
Each of the short scaffolds A ′, B ′ (= b ′) and c ′ is an isosceles trapezoid having an isosceles trapezoidal shape having two sides of the same length in the illustrated example as viewed from above and going toward the shaft center. For example, scaffold plates 21b, 22b, and 23b such as expanded metal are welded and fixed to the upper surfaces of the frames 21a, 22a, and 23a. In addition, it can replace with an expand and a striped steel plate, a flat steel plate, and other members can be used. Further, in each case, a handrail 26 for preventing falling is attached to the shaft side of the shaft.
Side scaffolding angle of short scaffold A 'is 20.25 °, the same as that of short trap A, and side scaffolding angle of short scaffold B' (= b ') is 13.5 °, same as that of short trap B, short scaffold c
The side sandwiching angle of 'is 22.5 ° which is the same as the part c of the landing 18 of the short trap C.
Bolt holes 24 for connecting adjacent short scaffolds with bolts are provided on the side surfaces of the left and right sides of each short scaffold A ′, B ′ (= b ′), c ′. A bolt hole 25 for fixing the short scaffolds A ′ and B ′ to the bracket 61 (described later) with bolts is provided at the center of the short scaffolds A ′ and B ′ (the central axis position of the side pinching angle). The short scaffolding c ′ has bolt holes 25 for fixing the short scaffolding c ′ to the two brackets 61 with bolts on both sides (both sides sandwiching the central axis of the side sandwiching angle).

Using the above-mentioned three types of short scaffolds 21, 22, and 23, A ′, B ′ (= b ′), and c ′, the upper end of the transferred lifting / lowering trap 6B and the lower end of the upper / lower lifting trap 6A In the meantime, the first work scaffold 41 is installed as shown in FIG. 3C. This first work scaffold 41 corresponds to the region S1 of four middle short traps A, A, B, and C (= b + c) in FIG. 3A as viewed from above, and includes A, A, B, and b. , C are arranged in the order of A ′, A ′, B ′, b ′, c ′.
That is, the short scaffolding A ′ is disposed corresponding to the short trap A, the short scaffold B ′ is disposed corresponding to the short trap B, and the short scaffold b ′ (corresponding to the b portion of the short trap C with a landing). = B ′) and a short scaffold c ′ corresponding to the c portion of the short trap C. The correspondence between them, that is, the correspondence between A and A ′, B and B ′, b and b ′, and c and c ′, is such that the sandwiching angle (side sandwiching angle) of the two sides toward the shaft center is the same. They are in an equal relationship.

Next, as shown in FIG. 3C, a second work scaffold 42 is installed between the lower end of the transferred lifting / lowering trap 6B and the upper end of the lower lifting / lowering trap 6C.
The second work scaffold 42 is composed of three kinds of A ′, B ′ (= b ′) and c ′, a total of 15 short scaffolds A ′, b ′ following the lower end of the connecting lifting trap 6B. , C ′ / A ′, A ′, B ′, b ′, c ′ /
A ', A', B ', b', c '/ A', B 'are connected in this order.
The second working scaffold 42 has three types (A ′, B ′ (= b ′), c ′) and five short scaffolds as A ′, A ′, B ′, b as the basic arrangement. Although the order is ', c', an existing short-length trap that is moved as a connecting lifting / lowering trap 6B in order to set the height of the second work scaffold 42 to an appropriate height with respect to the water collecting pipe 3 Since A and B are not A and A, the order of the short scaffolds at both ends of the second work scaffold 42 is changed from the basic order. It should be noted that the position exchange between A ′ and B ′ in the middle of A ′, A ′, B ′, b ′, and c ′ does not destroy the overall arrangement pattern, but the installation state of the structure on the inner wall The position exchange may be performed according to the above.
The sum of the sum of the side pinching angles of the respective short scaffolds constituting the first working scaffold 41 and the sum of the side pinching angles of the respective short scaffolds constituting the second working scaffold 42 is 360 °. In other words, when the first and second work scaffolds 41 and 42 are combined, it becomes one round of the inner wall of the shaft.

  As described above, when it becomes necessary to install a horizontal work scaffold in the existing shaft 1 'having only a spiral lift trap, the work is performed using all the existing lift traps 6'. Scaffolds can be installed. Therefore, it is possible to greatly simplify the construction in the case where the working scaffold is installed in the existing shaft having only the lifting and lowering traps, and the construction cost can be greatly reduced. In that case, most of the existing lifting and lowering traps 6 'are used as they are, and some of them will be relocated, but the lifting and lowering traps to be moved can be reduced as much as possible. Can be cheap.

In the description of the work scaffold structure described above, it has been described that a horizontal work scaffold is constructed on an existing shaft having only a spiral lift trap. However, when a shaft is newly constructed, the work scaffold is used together with the lift trap. Even when a scaffold is provided, this work scaffold structure can naturally be applied.
Even in that case, since the type of the side pinching angle of the short scaffolding that constitutes the work scaffold is the same as the type of the side pinching angle of the short length trapping that constitutes the lifting trap, It is possible to obtain a working scaffold structure in which the scaffolds are smoothly connected, the number of types of scaffold components (short scaffolds) is small, and the workability is good.
Further, in the method of installing a work scaffold using a plurality of scaffold plates of the same size as in Patent Document 1, for example, when a work scaffold is installed in the middle of an elevator trap in an existing shaft, the existing elevator trap It is difficult to leave most of the work as it is. On the other hand, if it is designed differently when installed in a new shaft and when installed in an existing shaft, the design itself becomes complicated, construction management also becomes complicated, and many unnecessary work increases, Workability is also lowered. Considering that there are many cases where it is necessary to install a working scaffold in an existing shaft with an elevating trap, the present invention is sufficiently effective when applied to a new shaft.

The structure which attaches a short length tapping to a shaft inner wall is demonstrated.
Since the attachment structures of the three types of short-type traps 11, 12, and 13 of A-type, B-type, and C-type are the same, the short-type trap 11 of type A will be described. In addition, the short trap 13 with a C-shaped landing place fixes the B-type trap portion 20 to the inner wall of the shaft.
FIG. 12 is an enlarged view of a portion of one A-type short trap 11 in FIG. 4 (however, the direction is changed and a part of the attachment to the inner wall of the shaft is partially omitted).
This short turlap 11 is attached to the inner wall of the shaft in the form of (a), (b), or (c) in FIG.
FIG. 14 shows a case where the short trap 11 is attached to the bolted flange portion 2 b of the upper and lower liner plates 2, and FIG. 15 shows a portion where the H-shaped steel reinforcing ring 7 is interposed between the flanges 2 b of the upper and lower liner plates 2. The case where it attaches to the flange 7a of the said reinforcement ring 7 is shown.

14 (b) is an enlarged view of the attachment portion (J portion) at the lower end of FIG. 13 (a), and FIG. 14 (a) is a plan view of FIG. 14 (b).
For attaching the short trap 11 to the circumferential flange 2b of the liner plate 2, the mounting member 15 (or 16) fixed to the lower end surface of the vertical column 11b (or the inclined column 11c) on the shaft inner wall side, and one end side A long and substantially rectangular mounting plate 51 having a round bolt hole 51a and a long bolt hole 51b on the other end side, a pipe-shaped spacer 52, a mounting bolt 53 and a nut 54 are used.
One end of the elongate mounting plate 51 is placed on the circumferential flange 2b on which the adjacent upper and lower liner plates 2 are overlapped, and fastened together with the circumferential flange 2b with bolts 28 and nuts 29 for flange joining.
A spacer 52 is interposed between the mounting plate 51 and the mounting member 15 (or 16) fixed to the lower end surface of the column 11b (or 11c), and the mounting bolt 53 is connected to the long hole 51b and the spacer 52 of the mounting plate 51. The bolts 15b (or 16b) of the mounting member 15 (or 16) are passed through the bolt holes 15b (or 16b), and the nuts 54 are screwed together to tighten the lower ends of the columns 11b (or 11c) to the bolts of the circumferential flange 2b of the liner plate 2. It attaches to a junction part (part of bolt 28 for flange joining).
In this case, since the mounting plate 51 has a certain length and the bolt hole 51b is a long hole, the position of the vertical column 11b (or the inclined column 11c) of the short trap 11 is the position of the bolt 28 for flange bonding of the liner plate. However, even if it is slightly deviated in the circumferential direction, it can be dealt with by changing the angle of the mounting plate 51 as shown in FIG.
When the attachment member 14 at the upper end of the vertical column 11b of the short trap 11 is attached to the inner wall of the shaft, the structure is basically the same, and FIG. 14 (c) is an enlarged view of the attachment portion (K portion) at the upper end of FIG. ).

FIG. 15 (b) is an enlarged view of the attachment portion (M portion) at the upper end of FIG. 13 (c), and FIG. 15 (a) is a plan view of FIG. 15 (b). The reinforcing ring 7 is disposed between the circumferential flanges 2b of the upper and lower liner plates 2 adjacent to each other, and is fixed integrally with the upper and lower circumferential flanges 2b by bolts 28 and nuts 29 for joining the flanges.
For attaching the short trap 11 to the reinforcing ring 7, the mounting member 14 fixed to the upper end surface of the vertical column 11b on the inner wall side of the shaft and the L-shaped cross-section having an upward bent portion 55a are formed, and the bolt hole 55b is provided. An L-shaped metal fitting 55, a pipe-like spacer 56 similar to the above, a mounting bolt 57 and a nut 58 are used.
The mounting member 14 fixed to the upper end of the vertical column 11b of the short trap 11 is placed on the upper edge of the flange 7a on the shaft center side of the reinforcing ring 7, and the flange 7a is sandwiched between the L-shaped bracket 55 and the mounting member 14. In this manner, the spacer 56 is disposed so as to be in contact with the lower end of the flange 7a, and a spacer 56 is interposed between the mounting member 14 and the L-shaped bracket 55, and the mounting bolt 57 is connected to the bolt hole 55b of the L-shaped bracket 55 and the spacer 56. The upper end of the column 11b is attached to the flange 7a of the reinforcing ring 7 by passing the bolt 58 through the bolt hole 14b of the mounting member 14 and screwing and tightening the nut 58.
In this case, the flange 7a of the reinforcing ring 7 is sandwiched between the upper mounting member 14 and the lower L-shaped metal fitting 55 and fastened with the mounting bolt 57 and the nut 58, and can be slid with respect to the reinforcing ring 7. From the above, there is no restriction on the position of the mounting member 14 in the circumferential direction of the shaft, and therefore, the column 11b of the short trap 11 can be attached to an arbitrary position of the reinforcing ring 7.
When this attachment structure is adopted and the attachment member 15 (16) at the lower end of the vertical support 11b (or the inclined support 11c) of the short trap 11 is attached to the flange 7a of the reinforcing ring 7, the structure is basically the same. The structure shown in FIG. 15C is an enlarged view of the attachment portion (N portion) at the lower end of FIG.

The scaffold attachment structure 70 for attaching the respective short scaffolds 21, 22, and 23 of the work scaffold to the inner wall of the shaft will be described.
FIG. 16 is an enlarged view of the short scaffolds 21, 22, and 23 of A ′ type, b ′ type (= B ′ type), and c ′ type in FIG.
Any scaffold mounting structure 70 uses the bracket 61 shown in FIG.
The two short scaffolds 21 and 22 of A ′ type and B ′ (= b ′) type are attached with a bracket 61 at one position of the central axis position of the side sandwiching angle.
The c′-type short scaffold 23 is attached with brackets 61 at two locations on both sides of the central axis position of the side pinching angle.
The bracket 61 for attaching the short scaffold has a horizontal member 62 whose proximal end is attached to the shaft inner wall and whose distal end extends in the shaft central direction, and whose upper end is fixed to the distal end of the horizontal member 62 and whose proximal end is the proximal end of the horizontal member 62. The slanting member 63 is attached to the inner wall of the shaft below the shaft.
The attachment part 60 which attaches the base end side of the said horizontal material 62 or the diagonal material 63 to a shaft inner wall is demonstrated.
The mounting portion 60 includes a mounting member 64 (or 64 ′), an L-shaped metal fitting 65, a lateral T-shaped member 69, a spacer 66, a mounting bolt 67, and a nut 68.
As shown in FIGS. 18A and 18B, the mounting member 64 (or 64 ′) is a portion whose one end is fixed to the base end side of the horizontal member 62 or the diagonal member 63 and extends horizontally to the shaft inner wall side. The other end has a downward bent portion 64a, has an L-shaped cross section, and has a bolt hole 64b.
As shown in FIG. 19, the horizontal T-shaped member 69 has a horizontal T-shaped cross section with a vertical portion 69a and a horizontal portion 69b. The vertical portion 69a serving as a rail is a single flat horizontal plate, but the horizontal portion 69b to be attached to the circumferential flange 2b is two substantially square plates welded and fixed to the vertical portion 69a with a gap w. The bolt hole 69c is made in each horizontal part 69b.
As shown in FIG. 20, the L-shaped metal fitting 65 has an L-shaped cross-sectional shape that extends horizontally toward the inner wall of the shaft and has an upward bent portion 65a at its end, and has a bolt hole 65b.
A pipe-shaped spacer 66 is interposed between the mounting member 64 and the L-shaped metal fitting 65, and the vertical portion 69 a on the distal end side of the lateral T-shaped member 69 is connected to the mounting member 64 and the L-shaped metal fitting 65. In the state of being sandwiched from above and below, the bolts 64b of the mounting member 64, the spacers 66, and the bolts 65b of the L-shaped metal fittings 65 are passed through the bolts 64b and the bolts 65b, and the nuts 68 are screwed together.
The adjacent short scaffolds are opened on the side surfaces of the side frames of the isosceles trapezoidal frames 21a, 22a, and 23a of the short scaffold, as shown in FIG. 23, for example, in the case where the short scaffold 21 and the short scaffold 22 are adjacent to each other. The bolts 24 are connected by connecting bolts 72 inserted through the bolt holes 24.

According to the mounting portion 60 described above, when the mounting bolt 67 is not strongly tightened, the mounting member 64, the spacer 66, and the L-shaped metal fitting 65 on the bracket 61 side are placed against the sideways T-shaped member 69 serving as a rail. As shown by a two-dot chain line in FIG. 21, the distance between the bolt holes of the circumferential flange 2b of the liner plate 2 (that is, the distance between the bolts 28 for flange joining) can slide in the circumferential direction. Therefore, the bracket 61 can be attached to an arbitrary place without being restricted by the position of the flange joining bolt 28. Thereby, each short scaffold which comprises a work scaffold can be connected without a gap in a horizontal direction.
In addition, the mounting portion 60 includes a mounting portion 64 (64 ') and an L-shaped metal fitting 65 sandwiching a vertical portion 69a of a laterally facing T-shaped member 69 fixed to the flange joint portion of the liner plate, and has a laterally T-shaped height. Since the structure is such that a bolt-like spacer 66 slightly smaller than the dimension of the vertical portion 69a of the member 69 is interposed and bolted, a firm mounting structure is obtained while being compact and simple.

In the case of the c′-type short scaffold 23, as shown in FIG. 16, it is attached with brackets 61 shown in FIG. 17 at two locations on both sides of the central axis position of the side-side pinching angle.
In the case of the short scaffold 23, since it is at the position of the vertical reinforcing member 8, a rectangular groove-shaped notch 71 is provided to avoid interference with the vertical reinforcing member 8. The notch 71 has a flat bar as a frame material.

  As shown in FIG. 22, the gap w between the two lateral portions 69b of the laterally facing T-shaped member 69 is such that the position of the bracket 61 is an end plate (vertical flange) where the liner plates 2 adjacent to each other in the circumferential direction are joined to each other. ) When it comes close to 2c, it is possible to fix the transverse T-shaped member 69 to the circumferential flange 2b across the end face plate 2c.

When either the horizontal member 62 or the diagonal member 63 of the bracket 61 comes to the position of the reinforcing ring 7, it is possible to use the flange of the reinforcing ring 7 made of H-shaped steel instead of using the transverse T-shaped member 69. it can. In this case, a spacer having a thickness obtained by adding the flange thickness and the web thickness of the H-shaped steel is interposed on the lower surface of the mounting member 64 ′ on the oblique member 63 side, thereby interposing the H interposed between the circumferential flanges 2 b. The height adjustment associated with the use of the shape steel (reinforcing ring 7) may be performed.
As described above, since the short scaffold is basically attached to the flange joint portion of the liner plate, it can also be adopted for a liner plate shaft without the reinforcing ring 7.

By the way, most of the wells made of liner plates have a diameter of 3.5 m. On the other hand, the interval between the bolt holes of the circumferential flange of the liner plate is set to 157 mm. When this is combined to form a shaft having a diameter of 3.5 m, the number of bolt holes in one circumference of the circumferential flange is 70.
When the vertical reinforcing members 8 are provided as in the water collecting wells of the embodiment, they are often arranged at intervals of 90 ° in the circumferential direction as in the embodiment. In that case, the number of bolt holes existing between the vertical reinforcing members 8 in the circumferential direction is 70 ÷ 4 = 17.5, which is a fraction.
For this reason, in the vertical shaft provided with the vertical reinforcing member 8, when attaching the short laps of the lifting and lowering laps to the flange joints of the upper and lower liner plates using the joining bolts, the positions and the positions of the columns 11b and 11c of the short laps are joined. The positional relationship between the two bolts 28 is not constant, for example, as shown in FIG.
Therefore, in this embodiment, as shown in FIG. 14, the positions of the short trapezoidal columns 11 b and 11 c that are displaced from the columns 11 b and 11 c are attached by using the connection plate 51 having the long holes 51 b for mounting. It can be adapted to the bolt 28 for use.
In the case of an elevating trap, the mounting structure using the mounting plate 51 is such that the load weight on each short trap is not so large, the short trap is attached to the inner wall of the shaft at three upper and lower positions, and the distance between the upper and lower mounting portions is There is no problem in strength because it is large (two or three liner plates above and below).
However, in the case of working scaffolds, it is usually necessary to set a larger load weight, and when mounting with one bracket is adopted, only two upper and lower positions can be mounted, and the vertical distance Is a small structure (one liner plate) and the like, a structure having a greater load resistance than the mounting structure using the mounting plate 51 is desirable.
The above-described scaffold mounting structure 70 meets such a requirement.
In addition, since the bolts 28 are used to fasten the circumferential flange 2b of the liner plate 2 at two locations, the stress can be fixed in two locations without being concentrated at one location on the circumferential flange 2b.

In the embodiment, it is assumed that the work scaffold is mainly used for the inspection work of the water collecting pipe. However, the work scaffold can be used for various inspection works, and is not limited to the inspection work. The use is not limited.
Moreover, it can apply not only to a drainage well but to various vertical shafts made from a liner plate.
In addition, both the short trap and the short scaffold in the present invention have an isosceles trapezoidal shape having two sides of the same length toward the shaft center when viewed from above, but it is not necessary to be an isosceles trapezoid and there is no problem. It does not prevent changing the shape in the range. In addition, if the upper base and the lower base of the trapezoid are arcuate, a fan shape is obtained, but such a shape is not disturbed.

1 Catchment well (vertical shaft)
1 '(No working scaffold) Existing drainage well (vertical shaft)
2 Liner plate 2a Corrugated steel plate part 2b Circumferential flange 2c Vertical flange (end plate)
3 Drainage pipe 4 Drain pipe 5 Sliding surface 6 Lifting trap 6A (from the lifting lifter / trap) Upper lifter / trap 6B Connecting lifter trap 6C (From the lifting lifter / tap) Lower lifter trap 6 'Existing lifter trap 7 Reinforcement Ring (H-shaped steel)
7a Flange 8 Vertical reinforcement member (H-section steel)
11 A-type short traps 11a, 12a, 13a Main bodies 11b, 12b, 13b Vertical columns 11b ', 12b', 13b '(on the shaft inner wall side) Vertical columns 11c, 12c, 13c (on the shaft inner wall side) Inclined struts 11c ', 12c', 13c 'Inclined struts 11d, 12d, 13d (at the shaft center side) Steps 11e, 11e', 12e, 12e ', 13e, 13e' Lower members 11f, 12f, 13f Lower end member 12 B-type short lap 12g Lower end member 13 C-type (= “b + c” -type) short wrap (short wrap with landing)
14 mounting members 15 and 16 (at the upper end of the short trap) mounting members 14a, 15a and 16a downward bent portions 14b, 15b and 16b bolt holes 17 handrail 18 landing 18a trapezoidal frame 18b plate 19 support structure 19a Diagonal member 20 B type trap part m, m ′ (for short turlap with landing (C type)) Lower extension part 12f (for vertical supports 12b, 12b ′ of B type trap part) Lower end member 21 A ′ type short scaffold 22 B 'type (= b' type) short scaffold 23 c 'type short scaffolds 21a, 22a, 23a Trapezoidal frames 21b, 22b, 23b Scaffold plates (expanded metal)
24 Bolt hole 25 (for joining short scaffolds) Bolt hole 26 Handrail 28 Bolt 29 (for flange joining of liner plate) Nut 41 First work scaffold 42 Second work scaffold 51 Mounting plate 51a Bolt hole (Round hole)
51b Bolt hole (long hole)
52, 56 Spacers 53, 57 Mounting bolts 54, 58 Nut 55 L-shaped bracket 55a Upward bent portion 55b Bolt hole 56 Spacer 57 Mounting bolt 58 Nut 60 Mounting portion 61 Bracket 62 Horizontal material 63 Diagonal materials 64, 64 ' Member 64a downward bent portion 64b bolt hole 65 L-shaped metal fitting 65a upward bent portion 65b bolt hole 66 spacer 67 mounting bolt 68 nut 69 sideways T-shaped member 69a vertical portion 69b horizontal portion w (between two horizontal portions) 69c Bolt hole 70 Scaffold mounting structure 71 Notch 72 Connection bolt

Claims (11)

A working scaffold structure in which a horizontal working scaffold is interposed in the middle of the lifting trap in the shaft having a spiral lifting trap attached to the inner wall of the shaft having a circular cross section constructed using a liner plate,
The elevating trap has a plurality of short traps each having a plurality of steps extending toward the shaft center and having a substantially trapezoidal shape in plan view with two sides extending toward the shaft center when viewed from above. The trap is attached to the inner wall of the shaft in a spiral arrangement,
As the plurality of short traps, N types (N ≧ 3) having different side trapping angles of the substantially trapezoidal shape in plan view are used,
The working scaffold has N types of planar trapezoidal shapes in plan view, each having two side edges toward the shaft center when viewed from above and having side edge angles equal to the N kinds of side edge angles of the short trap. A working scaffold structure in a shaft, comprising the N types of short scaffolds connected in the horizontal direction and attached to the inner wall of the shaft.   One of the N types of short-length traps of the lifting and lowering traps is the center of the vertical shaft at the lower end of the short trapezoidal structure having a substantially trapezoidal shape in plan view, each having two sides facing the vertical shaft center when viewed from above. The working scaffold structure in a shaft according to claim 1, wherein the structure is a short trap with a landing that is integrally provided with a quadrangular landing with two sides facing toward the center.   An upper first work scaffold and a lower second work scaffold, the installation height positions of which are different from each other; and a connecting lifting / lowering trap for connecting the first and second work scaffolds. In addition, the total of the side pinching angles of the respective short scaffolds constituting the first working scaffold and the sum of the side pinching angles of the respective short scaffolds constituting the second working scaffold is 360 °. The working scaffold structure in a vertical shaft according to claim 1 or 2.   In the case where the vertical reinforcing member is vertically attached to a plurality of locations spaced in the circumferential direction of the inner wall of the vertical shaft, as one type of the N types of short trapezoidal short-form scaffolds in plan view, The working scaffold structure in a shaft according to any one of claims 1 to 3, wherein a short scaffold having a notch for avoiding interference with the vertical reinforcing member is used.   When the vertical reinforcement member is vertically attached to a plurality of locations spaced in the circumferential direction of the inner wall of the shaft, the landing part in the short trap with the landing part does not interfere with the vertical reinforcement member. A short scaffold having a notch for avoiding interference with the vertical reinforcing member is used as one kind of the N kinds of the substantially trapezoidal short scaffolds in a plan view while being arranged at the position of the vertical reinforcing member. The working scaffold structure in a vertical shaft according to claim 2, wherein:   The said shaft is a catchment well, The working scaffold structure in the shaft of any one of Claims 1-5 characterized by the above-mentioned. Construction of a working scaffold structure for constructing a working scaffold structure according to claim 3 for an existing shaft having a spiral lifting elevator attached to an inner wall of a shaft having a circular cross section constructed using a liner plate A method,
The first one or more short scaffolds are formed in a manner adjacent to the lower end of the remaining upper raising / lowering trap that is removed from the inner wall of the middle one or more short traps of the spiral existing raising / lowering trap. A mode in which one end of the working scaffold is installed on the inner wall of the shaft, and the other end of the first working scaffold is adjacent to the upper end of the connecting lifting / lowering trap formed by using the one or more short traps removed. Then, a connecting lifting / lowering trap is installed on the inner wall of the shaft, and one end of the second working scaffold is installed on the inner shaft of the second working scaffold in a mode adjacent to the lower end of the connecting lifting / lowering trap. A construction method of a working scaffold structure in a vertical shaft, characterized in that an upper end of the remaining lower lifting trap is adjacent to the other end. In the working scaffold structure in the shaft of any one of Claims 1-7, It is a scaffold attachment structure which attaches each short length scaffold which comprises a working scaffold to a shaft inner wall,
A short scaffold is fixed to the upper surface of the bracket with the base end attached to the inner wall of the shaft,
The bracket includes a horizontal member whose base end side is attached to the shaft inner wall and whose tip side extends in the shaft center direction, and whose upper end side is fixed to the tip end side of the horizontal member and the base end side is attached to the shaft inner wall below the base end side of the horizontal member. Made of diagonal material,
The mounting portion for attaching the base end side of the horizontal material or the diagonal material to the inner wall of the shaft,
A mounting member having a bolt hole with a downward projecting portion at the other end of the portion that is fixed to the base end side of the horizontal member or the diagonal member and extends horizontally to the shaft inner wall side;
A metal fitting that extends horizontally toward the inner wall of the shaft and has an upward projecting portion at its end and a bolt hole;
A horizontal T-shaped section formed by a horizontal portion and a vertical portion, and the horizontal portion includes a horizontal T-shaped member fixed to the flange with a bolt that joins the flanges of the upper and lower liner plates;
It is a structure in which the base end side of the horizontal member or the diagonal member is attached to the shaft inner wall by sandwiching the vertical portion of the laterally T-shaped member from above and below with the attachment member and the metal fitting, and tightening both attachment members with attachment bolts and nuts. Scaffolding mounting structure characterized by that.   The scaffold mounting structure according to claim 8, wherein the bracket is disposed at a central axis position of a side sandwich angle of the short scaffold.   The scaffold mounting structure according to claim 8, wherein the brackets are arranged on both sides sandwiching the position of the central axis of the side sandwich angle of the short scaffold. A pipe-shaped spacer having a height slightly smaller than the vertical dimension of the transverse T-shaped member is interposed between the mounting member and the metal fitting, and tightened with a mounting bolt that passes through the spacer. The scaffold mounting structure according to any one of claims 8 to 10.

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