JP2011001739A - Method and scaffolding device for installing spiral staircase for vertical shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scaffolding device for installing a spiral staircase for a vertical shaft, which enables the spiral staircase to be easily and safely installed on the inner peripheral surface of the vertical shaft.SOLUTION: This scaffolding device includes: a travelable scaffolding base 1 which is installed on the ground; a scaffolding body 3 in which a plurality of steps of treadboards 3c are spirally provided on a main column 3a at almost the same spiral pitch as that of the spiral staircase; a first hanging means 12 which is provided on the scaffolding base, and which makes the scaffolding body ascendably/descendably hung in the vertical shaft 2; and a first lifting means 13 which is hung travelably on an annular guide rail 10 provided on the scaffolding base, and which carries the spiral staircase 20 into the vertical shaft in the state of hanging it. Even in the case of the vertical shaft which connects deep underground facilities 5 and the ground together, the spiral staircase can be installed on the inner peripheral surface of the vertical shaft without the erection of huge steel pipe scaffolding in the vertical shaft.

Description

  The present invention relates to a shaft staircase installation method for installing a spiral staircase on an inner peripheral surface of a shaft connecting an underground facility such as a common groove and the ground, and an installation scaffold device.

In recent years, a common ditch has been constructed as a facility for burying lifelines such as electricity, telephone, water supply, gas, etc., underground such as roads.
The common groove is an effective means for improving the aesthetics of the ground because cables such as electricity and telephones that have been laid on the ground up to now by power poles can be laid together underground.
In addition, pipes such as water and gas can be stored together in a common ditch so that pipes can be laid and maintained without digging up the road, so a common ditch is installed in the basement of high-traffic roads such as urban areas. Therefore, it has the advantage of eliminating traffic congestion due to construction.
On the other hand, since many facilities such as subways have already been built under the main roads in urban areas, when constructing a new common ditch, either avoid the subway facilities or go further down the subway facilities. Many of the co-grooves constructed in recent years are deep underground facilities.

In addition, underground facilities such as common trenches are connected to the ground by vertical shafts that are excavated in the vertical direction. When laying lifelines or maintaining lifelines in underground facilities, construction and maintenance are required from the vertical shafts. Incoming / outgoing materials and workers are going in and out.
For this reason, a working spiral staircase is installed in advance on the inner peripheral surface of the shaft (for example, Patent Document 1).
In Patent Document 1, in paragraph (0006) of the detailed description of the invention, “a spiral staircase arranged in a vertical shaft that communicates between a ground facility and an underground facility is known. This conventional spiral staircase is known. Consists of two spiral staircases from the ground facility to the underground facility along the inner peripheral surface of the shaft, and the spiral staircase is used for descending and the spiral staircase is used exclusively for ascending. There is a spiral staircase installed in the shaft.

Although the method for installing the spiral staircase on the inner peripheral surface of the shaft is not specifically described in Patent Document 1, the pipe scaffold is assembled from the inner bottom of the shaft to the ground after the shaft leading to the underground facility is constructed. In general, the method of installing the spiral staircase over the entire length of the shaft by receiving the unit member of the spiral staircase suspended from the ground on the pipe scaffolding and repeatedly attaching it to a predetermined position on the inner peripheral surface of the shaft It has been adopted.
However, with this method, in the case of a vertical shaft that connects a deep underground facility and the ground, the pipe scaffold to be assembled in the vertical shaft is also long, so it requires a lot of man-hours to assemble and disassemble the pipe scaffold, The construction period takes a long time and the work is performed at a high place.

In order to solve such a problem, for example, cited reference 2 describes a scaffold for deep foundation work that enables high-altitude work without assembling a pipe scaffold from the bottom of a shaft to the ground.
The scaffold for deep foundation work described in the cited document 2 is a structure in which a support arm is previously attached to the inner peripheral surface of the shaft, and a disk scaffold suspended from above the shaft is attached to the support arm. Since it is not necessary to assemble the pipe scaffolding to the ground, it is economical, and since there is no fear of the operator falling, there are effects such as high safety.

JP-A-6-313319 Japanese Utility Model Publication No. 6-87557

However, in the scaffold for deep foundation work described in Patent Document 1, it is necessary to attach the disk scaffold to each of the plurality of stages of support arms attached to the inner peripheral surface of the shaft, and to remove the disk scaffold and the support arms after the work is completed. For this reason, the conventional problems that require a lot of man-hours for assembling and removing the disk scaffolding and the supporting arm, which is uneconomical and takes a long construction period, have not been solved.
Also, when used as a scaffold for installing the spiral staircase on the inner peripheral surface of the shaft, the disk scaffold cannot interfere with the spiral staircase after the installation of the spiral staircase, so the disk scaffold cannot be suspended in the shaft, There is a problem that it becomes difficult to use the scaffold for maintenance or the like.
This invention was made in order to improve this problem, and it aims at providing the installation method and installation scaffold apparatus of the spiral staircase for shafts which can install a spiral staircase easily and safely in the internal peripheral surface of a shaft. Is.

  The installation method of the spiral staircase for shafts according to the present invention is a method for installing a spiral staircase for shafts in which a spiral staircase divided into a plurality of parts is installed on the inner peripheral surface of a shaft connecting an underground facility such as a common groove and the ground. A first suspension provided on a scaffolding base installed on the ground is provided with a scaffolding body in which a plurality of steps are spirally provided on the main pillar so that the spiral pitch is substantially the same as the spiral pitch of the spiral staircase. A step of suspending the scaffolding body, a step of suspending the scaffold main body to a predetermined position in the vertical shaft by the first suspension means in a state where the operator is on the tread, and a second suspension means provided on the scaffolding frame. The process of suspending the spiral staircase into the shaft and carrying it in, and the worker on the tread board receiving the spiral staircase, positioning it on the inner peripheral surface of the shaft, and fixing the spiral staircase to a predetermined position on the inner peripheral surface by fixing means And fixing the scaffold body From the process of raising or lowering the scaffold main body to the installation position of the next spiral staircase and the process of hanging the spiral staircase into the shaft and carrying it in, the scaffold main body is moved to the installation position of the next spiral staircase A spiral staircase is sequentially installed over the entire inner peripheral surface of the shaft by repeating the steps up and down.

By the above method, even in the case of a shaft that connects a deep underground facility and the ground, it is not necessary to assemble a long pipe scaffold in the shaft, so the number of man-hours required for assembly and dismantling of the pipe scaffold is reduced and the construction period is greatly increased. The cost can be reduced because the pipe scaffold is unnecessary.
In addition, since it is not necessary to work at heights such as when using pipe scaffolding, the installation work of the spiral staircase can be performed safely, and the spiral body in the shaft can be turned by turning the scaffolding body after the installation of the spiral staircase in the shaft. Since the scaffold body can be suspended in the shaft without causing the scaffold body to interfere with the stairs, the scaffold device can be used for work or maintenance in the underground facility.

  The installation method of the spiral staircase for shafts of this invention installs a landing place between each spiral staircase by carrying in suspension by alternately hanging the spiral staircase and the landing place by the second suspension means.

  According to the method, a landing can be easily installed between the spiral stairs.

  The vertical staircase installation device for a vertical shaft of the present invention is a vertical staircase for a vertical shaft in which a plurality of divided spiral stairs are sequentially installed on the inner peripheral surface of a vertical shaft that connects an underground facility such as a common groove and the ground. A scaffold device for installation, which is a scaffolding platform that is installed on the ground and that has a multi-step spiral plate on the main column so that the spiral pitch is substantially the same as the spiral pitch of the spiral staircase. And a first suspension means that is provided on the scaffolding frame and that suspends the scaffolding body in the shaft so as to be movable up and down, and is suspended on an annular guide rail provided on the scaffolding frame, and is suspended in the shaft. It is comprised from the 2nd lifting means to suspend and carry in a spiral staircase.

With the above configuration, even in the case of a vertical shaft that connects a deep underground facility and the ground, it is not necessary to assemble a long pipe scaffolding in the vertical shaft. The cost can be reduced because the pipe scaffold is unnecessary.
In addition, since it is not necessary to work at heights such as when using pipe scaffolding, the installation work of the spiral staircase can be performed safely, and the spiral body in the shaft can be turned by turning the scaffolding body after the installation of the spiral staircase in the shaft. Since the scaffold body can be suspended in the shaft without causing the scaffold body to interfere with the stairs, the scaffold device can be used for work or maintenance in the underground facility.

  The scaffolding device for installing a spiral staircase for shafts according to the present invention is provided with a plurality of stepping plates formed in a fan shape around a main column in a spiral shape so that a step is generated, and a safety fence is provided at least on the bottom stepping plate. It is set.

  With the above-described configuration, the entire tread is in a state of closing the shaft, and a safety fence is erected on the bottom tread so that there is no fear of falling into the shaft even if an operator accidentally steps off the tread.

  The scaffolding device for installing a spiral staircase for shafts according to the present invention is provided with a turning means between the tip of a rope suspended from the first lifting means and the upper end of the main column.

  With the above configuration, when the scaffold body is turned in the shaft, the scaffold body can be easily turned and at the same time, the rope can be prevented from being twisted.

  The scaffold device for installing a vertical staircase for shafts according to the present invention is provided with guide means that abuts the inner peripheral surface of the shaft when the scaffold body is moved up and down in the shaft on the outer periphery of the tread.

  Due to the above configuration, when an operator gets on the scaffolding body, when the scaffolding body is lifted or lowered while the worker is on the scaffolding body, or when the worker is on the scaffolding body, the load is offset on the scaffolding body. Even if the guide acts, the guide means abuts against the inner peripheral surface of the shaft and supports the unbalanced load, so the scaffold body does not tilt or swing unstably, and this ensures high safety during work. In addition, by using a caster or the like made of a rubber roller as the guide means, the inner peripheral surface of the shaft is not damaged by the outer peripheral portion of the tread.

  The scaffolding device for installing a spiral staircase for shafts according to the present invention includes a scaffold lifting operation means for operating the first suspension means wirelessly or by wire to raise and lower the scaffold body at a position where the scaffold body can be easily operated, and a spiral staircase. Remote operation means for operating the second suspension means to be carried in by radio is provided.

  With the above configuration, the operability of the second suspending means, which is more frequently operated than the first suspending means, can be improved, and a plurality of cables do not hang down in the shaft, so the cables are accidentally cut. Accidents such as accidents can be prevented.

  According to the installation method of the spiral staircase for shafts of the present invention, even in the case of a shaft connecting a deep underground facility and the ground, there is no need to assemble a long pipe scaffold in the shaft, so the assembly and disassembly of the pipe scaffold In addition to reducing the number of man-hours required for the construction, the construction period can be drastically shortened and the cost of the pipe can be reduced because the pipe scaffolding is not necessary.

It is a front view which shows the scaffold apparatus for installation of the spiral staircase for shafts which becomes embodiment of this invention. It is a top view which shows the scaffold apparatus for installation of the spiral staircase for shafts which becomes embodiment of this invention. It is an arrow view from the A direction of FIG. It is a perspective view of the scaffold main body which comprises the scaffold apparatus for installation of the spiral staircase for shafts which becomes embodiment of this invention. It is an enlarged front view of the scaffold main body which comprises the scaffold apparatus for installation of the spiral staircase for shafts which becomes embodiment of this invention. It is an arrow view from the B direction of FIG. It is an enlarged view in C circle of FIG. It is explanatory drawing which shows the installation method of the spiral staircase for shafts which becomes embodiment of this invention. It is explanatory drawing of a spiral staircase installed by the installation method of the spiral staircase for shafts which becomes embodiment of this invention.

Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a state in which a scaffold main body 3 is suspended in a shaft 2 from a scaffold base 1 installed on the ground, and shows a state in which a spiral staircase 20 has already been installed to the top.
The shaft 2 shown in FIG. 1 has, for example, an inner diameter of φ3,500 or φ3,900, and is almost vertical from the ground surface 4 until it reaches an underground facility 5 (see FIG. 9) such as a joint groove installed underground. The inner periphery of the shaft 2 is lined with a concrete wall 2a.

As shown in FIGS. 1 and 2, the scaffold base 1 installed on the ground is composed of pillars 1a arranged substantially vertically at the four corners, an upper reed 1b connecting between the upper ends of the respective pillars 1a, A cross-shaped support rod 1c having an outer end fixed substantially at the middle portion of the rod 1b, a lower horizontal rod 1d connecting the lower ends of the columns 1a, and each column 1a and upper and lower horizontal beams 1b and 1d are formed. The side brace 1e provided in an oblique direction to reinforce the quadrilateral to be formed and the upper side brace 1f provided on the diagonal of the quadrilateral formed by the upper horizontal rib 1b are formed into a substantially cubic frame structure as a whole. Yes.
On the lower part of the scaffold 1, wheels 7 are provided so as to be positioned at the lower ends of the respective pillars 1 a, and on the rails 8 laid on the ground surface 4 so as to sandwich the ground side opening 2 b of the shaft 2, The scaffolding platform 1 is placed via these wheels 7, and the entire scaffolding platform 1 can be moved on the rail 8 by the wheels 7.
In addition, you may enable it to make the scaffold main body 1 self-propelled by driving the wheel 7 with drive means like an electric motor.

In addition, a plurality of, for example, four outriggers 9 project from the lower portion of each column 1a in a direction perpendicular to the traveling direction of the scaffold 1.
The outrigger 9 is for fixing the scaffold base 1 to the ground surface 4 and is a substantially L-shaped leg portion 9a projecting from the outer surface of each column 1a and a screw projecting downward from the distal end side of the leg portion 9a. The shaft 9b includes a ground plate 9c provided below the screw shaft 9b, and the upper end side of the screw shaft 9b is screwed substantially perpendicularly to the tip of the leg portion 9a.

On the other hand, a guide rail 10 composed of an annular portion 10a and a linear carry-in portion 10b extending in a tangential direction of the annular portion 10a is fixed horizontally to the lower surface of the support rod 1c of the scaffold base 1, and the annular portion 10a. A first suspending means 12 made of an electric chain hoist or the like is attached to the lower surface of the central portion of the support rod 1c located at the center.
The annular portion 10a of the guide rail 10 is formed so that the diameter thereof is slightly smaller than the inner diameter of the shaft 2, and the leading end side of the carry-in portion 10b that extends in the tangential direction from the annular portion 10a is in the set-up direction described later The front end portion is supported by a support frame 1h projecting in the horizontal direction from the upper reed 1b.
A second suspension means 13 made of a self-propelled electric chain hoist or the like is suspended from the guide rail 10.
The second suspension means 13 is provided with a traveling roller 13a that rolls on the guide rail 10, and is capable of traveling along the guide rail 10 by the traveling roller 13a. By suspending one unit of the spiral staircase 20 divided into a plurality of split staircases 20 on a hook 13c provided at the tip of a rope 13b made of a chain suspended from the spiral staircase 20, the spiral staircase 20 can be carried in one unit at a time. Yes.

The first suspension means 12 attached to the center portion of the support rod 1c is suspended from the support plate 1g projecting from the lower surface of the center portion of the support rod 1c, and is suspended from the first suspension means 12. A hook 12b is provided at the tip of the rope 12a made of a chain.
A suspension plate 15a of the turning means 15 provided at the upper end of the scaffold body 3 is suspended from the hook 12b.
The scaffold body 3 is provided with a main pillar 3a made of, for example, a steel pipe in the vertical direction, and a turning means 15 is provided at the upper end of the main pillar 3a.
By turning the scaffold body 3 suspended in the shaft 2 via the rope 12a suspended from the first suspension unit 12 when the scaffold body 3 is swung in the shaft 2 by human power, While preventing the rope 12a from being twisted, the scaffold body 3 can be easily turned. As shown in FIG. 5, a ring is provided below the locking plate 3b fixed to the upper end of the main column 3a. A rotating plate 15b is provided.

The rotating plate 15b is rotatably fitted to the outer peripheral portion of the main pillar 3a, and a low friction having a slipperiness such as Teflon (registered trademark) between the upper surface of the rotating plate 15b and the lower surface of the locking plate 3b. One or a plurality of plates 16 are interposed so as to reduce the frictional resistance when the scaffold body 3 turns.
A suspension plate 15a protrudes from the upper surface of the rotating plate 15b so as to avoid the locking plate 3b fixed to the upper end of the main column 3a, and the suspension hole 15c formed in the suspension plate 15a has a first hole 15c. A hook 12b provided at the tip of the rope 12a suspended from the suspending means 12 is detachably engaged.

The main pillar 3a of the scaffold body 3 is provided with a plurality of steps 3c so as to go around the main pillar 3a almost at an interval in the vertical direction.
As shown in FIG. 3, each tread 3c is formed in a fan shape with the main pillar 3a as the center (required), and the center side end of each tread 3c is on the outer peripheral surface of the main pillar 3a as shown in FIG. It is fixed to draw a spiral.
Each step board 3c is provided substantially horizontally so that steps are formed at regular intervals in the vertical direction. When the scaffold body 3 is suspended in the shaft 2, the outer peripheral edge of each step plate 3c and the inner peripheral surface of the shaft 2 are provided. The radius of each tread 3c is set so that a gap of about 100 mm, for example, is generated between them.
As a result, even if an operator rides on the step board 3c of the scaffold body 3, there is no fear of the operator dropping from the gap between the inner peripheral surface of the shaft 2 and the outer surface of the step board 3c, and the uppermost step board 3c A safety shelf 3d is erected on the lower tread 3c, so that even if an operator steps off the tread 3c during work, it does not fall further below the shaft 2 from the lowest level of the tread 3c.

A plurality of guide means 17 are provided for each of the treads 3c on the outer periphery of the treads 3c with intervals in the circumferential direction.
As shown in FIG. 7, for example, a caster having a rubber roller 17 a is used as the guide means 17, and when the scaffold body 3 is moved up and down in the shaft 2, the rubber roller 17 a of the guide means 17 is applied to the inner peripheral surface of the shaft 2. It touches and guides the raising and lowering of the scaffold body 3 and at the same time prevents the scaffold body 3 from damaging the inner peripheral surface of the shaft 2 by preventing the tread 3c from directly contacting the inner peripheral surface of the shaft 2 It can be done.

On the other hand, a cable 18 is suspended from the first suspension means 12 so that the scaffold body 3 can be lifted and lowered from the scaffold body 3 suspended in the shaft 2.
The cable 18 has such a length that the length is not short even when the scaffold body 3 is lowered to the lowermost part of the shaft 2, and the distal end side of the cable 18 enters the main column 3a from the upper surface opening of the main column 3a. Has been introduced.
On the outer peripheral surface of the main column 3a, a scaffold lifting / lowering operation means 19 composed of an on / off switch is provided at a position that is easy for an operator on the tread 3c to operate. The distal end portion of the cable 18 led out to the outside of the main column 3a from the through hole 3e is connected to the scaffold lifting operation means 19.
The lifting / lowering operation means 19 is provided with a raising button 19a and a lowering button 19b. When the lifting button 19a is pressed, the first hanging means 12 raises the scaffold body 3 and when the lowering button 19b is pressed, 1 The suspension means 12 lowers the scaffold main body 3, and when the pressing of the up button 19a or the lower button 19b is released, the scaffold main body 3 is stopped at that position.

As shown in FIG. 5, the middle portion of the cable 18 suspended downward from the main pillar 3a of the scaffold main body 3 is U-turned upward in the middle, and the turning means 15 provided on the upper part of the main pillar 3a. The suspension plate 15a is provided with a cable guide 21 for guiding the cable 18 so as not to contact the inner peripheral surface of the main pillar 3a.
The cable guide 21 includes a substantially U-shaped bracket 21a projecting from the side surface of the suspension plate 15a. A groove 21b is rotatably supported by the cable guide 21 between the groove 21b and the U-shaped portion of the bracket 20a. When the scaffold main body 3 moves up and down in the shaft 2, the cable 18 is prevented from being worn by sliding contact with the inner peripheral surface of the main pillar 3a. The other end side of the rope 12a that circumvents the suspended first suspending means 12 is also suspended from the first suspending means 12.

Similarly to the cable 18, the rope 12 a has a length that does not become insufficient even when the scaffold body 3 is lowered to the lowest part of the shaft 2, and the leading end of the rope 12 a is provided on the suspension plate 15 a of the turning means 15. It is introduced into the main pillar 3a of the scaffold body 3 through the cable guide 22 formed.
Similar to the cable guide 21, the rope guide 22 is supported by a substantially U-shaped bracket 22a so that a groove wheel 22b is rotatably supported. The rope guide 22 passes through the U-shaped portion of the groove wheel 22b and the bracket 22a so that the rope is the main pillar 3a. When the scaffold body 3 is moved up and down, the cable guide 22 guides the cable so that the cable does not come into contact with the inner peripheral surface of the main pillar 3a. Both wear and noise caused by sliding contact with the peripheral surface are prevented.
As shown in FIG. 5, the intermediate portion of the rope 12a hanging downward from the main pillar 3a of the scaffold body 3 is U-turned upward in the middle, and then the tip portion is bound to the lower portion of the main pillar 3a. ing.

On the other hand, a hook 13c is attached to one end side of the rope 13b made of a chain suspended from the second suspending means 13, and the slinging rope 24 attached to the spiral staircase 20 is engaged with the hook 13c, so that the second The spiral staircase 20 is suspended in the shaft 2 by the suspension means 13.
The rope 13a of the second suspending means 13 has a length that does not become deficient even when the spiral staircase 20 is suspended to the lowermost part of the shaft 2 like the rope 12a suspended from the first suspending means 12. The other end side of the rope 13a suspended from the second suspension means 13 is suspended below the shaft 2 through the gap formed between the treads 3c of the scaffold body 3 on the inner peripheral surface of the shaft 2. .

Further, since the second suspending means 13 is operated more frequently than the first suspending means 12, the second suspending means 13 can be operated by a remote operation means 25 such as a remote controller capable of controlling all operations by wireless remote operation. It has become.
That is, an operator who rides on the footboard 3c of the scaffold main body 3 operates the remote control means 25 with his / her hand so that the second suspension means 13 travels on the guide rail 10 to a desired position, or the hook 13c The hanging up and down operation of the suspended spiral staircase 20 can be performed.
The main pillar 3a of the scaffold body 3 is provided with a plurality of locking rings 27 for hooking a safety band 26 worn by an operator, and the safety band 26 and the hook 26a are hooked on the locking ring 27. By hooking, it is possible to prevent the operator from falling down.

Next, a method of sequentially installing the spiral staircase 20 divided into a plurality of parts in the shaft 2 using the constructed scaffold for staircase installation of the shaft will be described with reference to FIGS.
In installing the spiral staircase 20, the scaffold base 1 is first moved to a setup place (not shown) installed at a position away from the ground opening 2b of the shaft 2, and is suspended from the first suspension means 12 at the setup place. The scaffold body 3 is suspended through a hook 12b provided at the tip of the rope 12a.
When the scaffold body 3 is set on the first suspending means 12, the scaffold base 1 is moved in the direction of the shaft 2, and the scaffold base 1 is stopped at a position where the center of the shaft 2 and the center of the scaffold base 1 coincide.
As a result, the scaffold main body 3 is suspended from the center of the shaft 2, so that the screw shaft 9 b of the outrigger 9 is rotated at this position, and the ground plate 9 c provided at the lower end of the screw shaft 9 b is attached to the ground surface 4. To ground.
Thereafter, the screw shaft 9b is further rotated to lift the entire scaffold frame 1 to a state where the wheel 7 is lifted from the rail 8, whereby the scaffold frame 1 is fixed to the ground surface 4 by the outrigger 9.

Next, in this state, the scaffold main body 3 is lowered into the shaft 2 by the first suspending means 12, and when the uppermost step board 3 c reaches almost the same height as the ground surface 4, the scaffold main body 3 is stopped, and the spiral staircase 20 The number of workers required for the installation of the platform board on the footboard 3c of the scaffold body 3.
Even when an unbalanced load is applied to the scaffold main body 3 when the operator gets in, the rubber roller 17a of the guide means 17 provided on the outer peripheral portion of each tread plate 3c of the scaffold main body 3 lowered into the vertical shaft 2 is the inner peripheral surface of the vertical shaft 2 Since the scaffold main body 3 does not tilt, the entire tread 3c is in a state of closing the shaft 2, and the safety fence 3d is erected on the bottom tread 3c. There is no fear of falling into the shaft 2 even if the operator accidentally steps off the tread 3c.
When an operator gets into the scaffold main body 3, the hook 26 a of the safety belt 26 worn by each worker is hooked on a locking ring 27 protruding from the main column 3 a, and then on the outer peripheral surface of the main column 3 a. The lowering button 19 b of the provided scaffold lifting operation means 19 is operated, and the scaffold body 3 is lowered into the shaft 2 by the first suspension means 12.

And if the scaffold main body 3 reaches the vicinity of the lowest part of the shaft 2, the scaffold main body 3 is stopped, and the attachment position of the spiral staircase 20 installed in the lowest part is confirmed.
Thereafter, a wireless communication means (not shown) such as a transceiver is used to contact a worker on the ground and request the loading of the spiral staircase 20.
An operator on the ground moves the second suspension means 13 toward the loading portion 10b side of the guide rail 10 while the scaffold body 3 is lowered into the shaft 2, and the second suspension means at the setup location. The spiral staircase 20 installed at the lowermost stage is hung on the hook 13 b provided at the tip of the 13 ropes 13 a using the sling rope 24.
And if the communication of the carrying in from the operator who got on the scaffold main body 3 is received by radio, the 2nd suspending means 13 will be moved to the shaft 2 direction, and the lowermost spiral staircase 20-1 from the ground opening 2b of the shaft 2 will be shown. Is carried into the shaft 2.
Upon receiving a notification of completion of delivery from the worker on the ground, the worker on the scaffold main body 3 operates the remote control means 25 for controlling the operation of the second suspension means 13 to search the second suspension means 13. The spiral staircase 20 suspended from the strip 13a is lowered into the shaft 2.

The spiral staircase 20 is divided into a plurality of parts, a pair of left and right side plates 20a that are spirally bent along the inner peripheral surface of the shaft 2, and a substantially fan-shaped step plate 20b that is horizontally mounted between the side plates 20a. A plurality of mounting holes (not shown) are previously drilled in the outer side plate 20a in contact with the inner peripheral surface of the shaft 2 with a space in the longitudinal direction.
When the spiral staircase 20-1 installed at the lowermost stage is lowered by the second suspending means 13 and reaches the lowermost part of the shaft 2, a plurality of workers riding on the treads 3c are connected to the upper and lower parts of the spiral staircase 20-1. In the state of supporting, the second hanging means 13 finely adjusts the vertical movement, and when the spiral staircase 20-1 reaches a predetermined position, the descent is stopped.

In this state, the outer side plate 20a is brought into contact with the inner peripheral surface of the shaft 2 and the position of the mounting hole drilled in the side plate 20a is marked on the inner peripheral surface of the shaft 2, but is suspended by the second suspension means 13 When the position of the lowermost spiral staircase 20-1 lowered is shifted in the circumferential direction of the shaft 2, the remote operation means 25 causes the second suspension means 13 to self-propell along the guide rail 10, and the circumferential direction Correct the misalignment.
Then, when a fixed hole (not shown) is drilled in the marked inner peripheral surface of the shaft 2 using an electric tool such as an electric drill, the outer side plate 20a of the spiral staircase 20 is again brought into contact with the inner peripheral surface of the shaft 2. Then, in a state where the mounting hole of the side plate 20a and the fixing hole of the inner peripheral surface of the shaft 2 are positioned, a fixing means (not shown) such as a chemical anchor (registered trademark) is inserted from the mounting hole, and the outside of the spiral staircase 20 The side plate 20 a is fixed to the inner peripheral surface of the shaft 2.

When the installation of the lowermost spiral staircase 20-1 is completed, the scaffold main body 3 is raised to install the next spiral staircase 20-2. At this time, the spiral staircase 20- already installed on the inner peripheral surface of the shaft 2 is used. Since the scaffold main body 3 is stopped at the intermediate position 1, if the scaffold main body 3 is lifted as it is, the scaffold main body 3 and the installed spiral staircase 20-1 interfere to prevent the scaffold main body 3 from rising. Become.
However, since the scaffold body 3 is manufactured in advance so that the spiral pitch of the spiral staircase 20 and the spiral pitch of the footboard 3c of the scaffold body 3 are substantially the same, the scaffold body 3 is gradually raised by the first suspension means 12. Thus, an operator riding on the tread 3c rotates the scaffold main body 3 by human power while pushing the inner peripheral surface of the shaft 2 so that the tread 3c of the scaffold main body 3 does not interfere with the spiral staircase 20.

That is, if the spiral staircase 20 installed on the inner peripheral surface of the shaft 2 is a female screw formed on a nut, for example, and the main pillar 3a of the scaffold body 3 is a bolt, the tread 3c is a male screw of a bolt screwed into the female screw. For example, by rotating the bolt body 3 and rotating the scaffold body 3 so as to remove the bolt, the spiral staircase 20-1 installed on the inner peripheral surface of the shaft 2 and the tread 3c do not interfere with each other. The main body 3 can be raised.
When the scaffold main body 3 reaches the vicinity of the upper end of the spiral staircase 20-1 already installed, the scaffold main body 3 is stopped, and in order to install the second spiral staircase 20-2, first, the lowermost spiral staircase 20-1 When the operator on the ground is wirelessly communicated to carry the landing 20c installed between the second spiral staircase 20-2 and the landing 20c is lowered to a predetermined position by the second suspension means 13, the lowest spiral A landing 20c is installed horizontally above the stairs 20-1.
When the installation of the landing 20c is completed, the second spiral staircase 20-2 is installed on the inner peripheral surface of the shaft 2 in the same manner as when the lowermost spiral staircase 20-1 is installed.

Thereafter, the same operation is repeated to sequentially install the spiral staircase 20 and the landing 20c up to the uppermost spiral staircase 20-n as shown in FIG. By alternately repeating the loading operation of the spiral staircase 20 and the landing 20c by the second suspending means 13, the spiral staircase 20 is installed on the inner peripheral surface of the shaft 2 leading to the deep underground facility without installing a pipe scaffold. Will be able to.
Also, during the installation work of the spiral staircase 20, workers gathered in one direction of the scaffold main body 3, or one worker supported the spiral staircase 20, so that an uneven load was concentrated in one direction of the scaffold main body 3. Even in this case, since the guide means 17 provided on the outer peripheral surface of each tread 3c abuts on the inner peripheral surface of the shaft 2 and bears an unbalanced load, the scaffold main body 3 tilts or swings unstablely in the shaft 2. Since it does not move, the worker can continue working safely without feeling uneasy.

The above has described the installation method in the case where the spiral staircase 20 is installed from the bottom of the shaft 2, that is, the position closest to the underground facility 5, but from the top of the shaft 2, that is, from the opening 2 b side opened to the ground surface 4 You may make it install the spiral staircase 20 to the lowest side of the shaft 2 sequentially.
In this case, when all the spiral staircases 20 have been installed, the scaffold main body 3 is positioned at the lowermost spiral staircase 20, but the shaft 2 is turned by manually turning the scaffold main body 3 while raising the scaffold main body 3. The scaffold main body 3 can be raised without causing the spiral staircase 20 and the scaffold main body 3 installed on the inner peripheral surface of the scaffold to interfere with each other, and the scaffold main body 3 can be recovered from the shaft 2.

  In addition, when the scaffold main body 3 is moved up and down in the shaft 2 for the purpose of maintaining the spiral staircase 20 where the spiral staircase 20 is installed, an operator who gets on the scaffold main body 3 turns the scaffold main body 3 manually. Thus, the scaffold main body 3 can be raised and lowered in the vertical shaft 2 without interfering with the spiral staircase 20 installed on the inner peripheral surface of the vertical shaft 2 and the scaffold main body 3, and not only when installing the spiral staircase 20, The scaffold body 3 can also be used during the maintenance of the spiral staircase 20 and the maintenance of the underground facility.

  In the above-described embodiment, the case where the electric chain hoist is used for the first and second suspension means 12 and 13 has been described. The reason is that a long wire rope that can correspond to the full length of the deep shaft 2 is used. Since there is no electric hoist that can be wound on the market, an electric chain hoist whose length can be freely extended is used. If the depth of the underground facility 5 is relatively shallow, an electric hoist using a wire rope should be used. Of course, the first and second suspension means 12 and 13 may be used.

DESCRIPTION OF SYMBOLS 1 Scaffolding frame 2 Vertical shaft 3 Scaffolding body 3a Main pillar 3c Tread 5 Subterranean facility 10 Guide rail 12 First suspension means 12a Strip 13 Second suspension means 15 Turning means 17 Guide means 19 Scaffolding raising / lowering operation means 25 Remote operation means

Claims (7)

  A method for installing a spiral staircase for a shaft, in which a spiral staircase divided into a plurality of parts is installed on the inner peripheral surface of a shaft connecting an underground facility such as a common ditch and the ground, substantially the same as the spiral pitch of the spiral staircase A step of suspending a scaffold body in which a plurality of steps are spirally provided on a main pillar so as to have a spiral pitch on a first suspension means provided on a scaffolding base installed on the ground, and working on the steps A step of suspending the scaffold main body to a predetermined position in the shaft by the first suspension means, and the spiral staircase in the shaft by the second suspension means provided on the scaffolding frame. A step of suspending and carrying, and an operator on the tread board receives the spiral staircase carried in, positions it on the inner peripheral surface of the shaft, and places the spiral staircase at a predetermined position on the inner peripheral surface by a fixing means. Fixing step and said foot From the step of raising or lowering the scaffold main body to the installation position of the spiral staircase to be installed next while turning the main body, and the step of hanging and carrying the spiral staircase into the shaft, the spiral staircase to be installed next A method of installing a spiral staircase for shafts, wherein the spiral staircase is sequentially installed on the entire inner peripheral surface of the shaft by repeating the process of raising or lowering the scaffold main body to an installation position.   The installation method of the spiral staircase for shafts according to claim 1, wherein a landing is installed between the spiral stairs by alternately suspending and carrying in the spiral stairs and landing by the second suspension means.   A scaffolding device for installing a spiral staircase for shafts that sequentially installs a plurality of spiral staircases on the inner peripheral surface of a shaft that connects an underground facility such as a common ditch and the ground. A flexible scaffold, a scaffold main body in which a plurality of steps are spirally provided on a main column so as to have a spiral pitch substantially the same as the spiral pitch of the spiral staircase, and the scaffold main body provided on the scaffold base The first suspending means for suspending up and down in the vertical shaft and the annular guide rail provided on the scaffolding frame, and the spiral staircase is suspended and carried in the vertical shaft. A scaffolding device for installing a spiral staircase for shafts comprising a second lifting means.   The shaft spiral according to claim 3, wherein a plurality of treads formed in a fan shape are provided in a spiral shape around the main pillar so that a step is generated, and a safety fence is erected at least on the bottom tread. Scaffolding device for stair installation.   The scaffolding device for installing a spiral staircase for shafts according to claim 3 or 4, wherein swiveling means is provided between the tip of the rope suspended from the first lifting means and the upper end of the main pillar.   The installation of the spiral staircase for shafts according to any one of claims 3 to 5, wherein guide means for abutting the inner peripheral surface of the shaft when the scaffold main body is raised and lowered in the shaft is provided on the outer periphery of the tread. Scaffolding device.   A scaffold lifting operation means for operating the first suspension means wirelessly or by wire to raise and lower the scaffold body at a position where the scaffold body is easy to operate, and a second suspension means for carrying the spiral staircase wirelessly. A scaffolding device for installing a spiral staircase for shafts according to any one of claims 3 to 6, further comprising a remote control means operated by the shaft.

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