JP7483496B2 - Scaffolding support pipe insertion method - Google Patents

Description

The present invention relates to a construction method for inserting scaffolding support pipes into the interior of large cylindrical structures, such as radiant sections constructed above converters in steelworks, so as to penetrate the cylindrical structures horizontally.

When inspecting or repairing the inside of a large tubular structure such as the radiant section or dust collection duct constructed above a steelworks converter or a large factory chimney, a work platform scaffold is set up inside the tubular structure, but before setting up this work platform scaffold, pipes to support the work platform must be erected horizontally inside the tubular structure.

On the other hand, examples of prior art that may be related to the present invention include the "scaffolding mechanism for work inside a vertical water-cooled duct" described in Patent Document 1 and the "intra-duct scaffolding mechanism" described in Patent Document 2.

The "scaffolding mechanism for work inside a vertical water-cooled duct" described in Patent Document 1 is a removable scaffolding mechanism for use inside a vertically installed water-cooled duct, in which a rod-shaped object serving as a scaffold is inserted horizontally into the inner tube of the water-cooled duct, and through holes having guide portions for further insertion from the inner tube to the outer tube are provided in the outer tube and inner tube of the water-cooled duct, a pair of support tubes are provided that protrude outside the outer tube of these through holes, and another pair of support tubes are provided that protrude outside the other through holes by similarly providing other through holes at positions at the same height as the through holes, and a rod-shaped object longer than the span of the pair of support tubes is inserted into the pair of support tubes and through holes from the outside of the outer tube of the water-cooled duct, and the rod-shaped object protruding outside the support tubes is fixed from the outside.

The "intra-duct scaffolding mechanism" described in Patent Document 2 is an intra-duct scaffolding mechanism for setting up scaffolding in a duct that requires a ladder-like scaffolding for workers to move around inside the duct, and is made up of multiple rod-shaped bodies that can be freely formed into scaffolding and are formed to be shorter than the inner diameter of the duct, and multiple scaffolding attachment means that can freely engage or fix the multiple rod-shaped bodies inside the duct. The rod-shaped bodies are provided with locking parts that can be engaged with the scaffolding attachment means, and the multiple scaffolding attachment means are arranged facing the inside of the duct so that the rod-shaped bodies can be installed at predetermined positions at predetermined intervals, and the rod-shaped bodies are configured to be freely engaged and detached from the scaffolding attachment means.

JP 2010-126979 A JP 2001-140570 A

The "scaffolding installation mechanism for work inside vertical water-cooled ducts" described in Patent Document 1 and the "intra-duct scaffolding mechanism" described in Patent Document 2 are excellent in their respective technical fields, but since Patent Documents 1 and 2 do not describe the construction method of inserting a rod-shaped object into a duct, it is not possible to use them in work such as the present invention, where a scaffolding support pipe is inserted into a large cylindrical structure.

The problem that this invention aims to solve is to provide a scaffolding support pipe insertion method that allows the safe and efficient insertion of scaffolding support pipes into large cylindrical structures.

The first scaffolding support pipe insertion method according to the present invention is a method of inserting a scaffolding support pipe so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the scaffolding support pipes,
A step of disposing a guide roller in one of the through holes to clamp the scaffolding support pipe so as to be movable in the longitudinal direction;
Fixing an extension pipe to the base end of the scaffolding support pipe;
A step of inserting the tip end side of the scaffolding support pipe into an internal space of the cylindrical structure via the guide roller and one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
and exposing the tip of the scaffolding support pipe to the outside of the other through hole.

The second scaffolding support pipe insertion method according to the present invention is a method of inserting a scaffolding support pipe so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the scaffolding support pipes,
A step of disposing a guide roller in one of the through holes to clamp the scaffolding support pipe so as to be movable in the longitudinal direction;
A step of connecting an extension pipe to the base end of the scaffolding support pipe in a state in which the extension pipe can be inserted and removed from the inside of the scaffolding support pipe in the longitudinal direction;
A step of inserting the tip end side of the scaffolding support pipe into an internal space of the cylindrical structure via the guide roller and one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
and exposing the tip of the scaffolding support pipe to the outside of the other through hole.

The third scaffolding support pipe insertion method according to the present invention is a method of inserting a scaffolding support pipe so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the scaffolding support pipes,
A step of disposing a guide roller in one of the through holes to clamp the scaffolding support pipe so as to be movable in the longitudinal direction;
A step of disposing a support means for supporting the scaffolding support pipe so as to be movable in a longitudinal direction at a position outside the cylindrical structure and away from the guide roller;
a step of inserting a guide pipe into the scaffolding support pipe from a base end of the scaffolding support pipe placed on the support means, and clamping the tip end of the guide pipe protruding from the tip end of the scaffolding support pipe with the guide roller;
A step of moving the scaffolding support pipe along the guide pipe toward the guide roller and inserting it into the internal space of the cylindrical structure through one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
and exposing the tip of the scaffolding support pipe to the outside of the other through hole.

The fourth scaffolding support pipe insertion method according to the present invention is a method of inserting a scaffolding support pipe so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the scaffolding support pipes,
Fixing an extension pipe to the base end of the scaffolding support pipe;
A step of inserting a tip end side of the scaffolding support pipe into an internal space of the tubular structure through one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
and exposing the tip of the scaffolding support pipe to the outside of the other of the through holes.

The fifth scaffolding support pipe insertion method according to the present invention is a method of inserting a scaffolding support pipe so as to communicate with at least a pair of through holes opened in a peripheral wall of a bottomed tubular structure in a state in which the inner space of the bottomed tubular structure is sandwiched between the scaffolding support pipes,
A step of disposing an internal support means on a bottom surface of the bottomed cylindrical structure, the internal support means supporting the scaffolding support pipe so as to be movable in a longitudinal direction within the bottomed cylindrical structure;
A step of inserting a tip end side of the scaffolding support pipe into an internal space of the bottomed tubular structure through one of the through holes;
a step of moving the scaffolding support pipe supported by the internal support means toward the other through hole;
and exposing the tip of the scaffolding support pipe supported by the internal support means to the outside of the other through hole.

The present invention provides a scaffolding support pipe insertion method that allows the safe and efficient insertion of scaffolding support pipes into large cylindrical structures.

FIG. 1 is a schematic process diagram showing the construction process of the scaffolding support pipe insertion method according to the first embodiment of the present invention. 2A is a side view showing a scaffolding support pipe insertion structure formed by the scaffolding support pipe insertion method shown in FIG. 1 , and FIG. 2B is a plan view of the scaffolding support pipe insertion structure. FIG. 5 is a schematic process diagram showing the construction process of the scaffolding support pipe insertion method according to the second embodiment of the present invention. 4A is a side view showing a scaffolding support pipe insertion structure formed by the scaffolding support pipe insertion method shown in FIG. 3, and FIG. 4B is a plan view of the scaffolding support pipe insertion structure. FIG. 11 is a schematic process diagram showing the construction process of the scaffolding support pipe insertion method according to the third embodiment of the present invention. 6A is a side view showing a scaffolding support pipe insertion structure formed by the scaffolding support pipe insertion method shown in FIG. 5, and FIG. 6B is a plan view of the scaffolding support pipe insertion structure. FIG. 11 is a schematic process diagram showing the construction process of the scaffolding support pipe insertion method according to the fourth embodiment of the present invention. 8A is a side view showing a scaffolding support pipe insertion structure formed by the scaffolding support pipe insertion method shown in FIG. 7, and FIG. 8B is a plan view of the scaffolding support pipe insertion structure. FIG. 13 is a schematic process diagram showing the construction process of the scaffolding support pipe insertion method according to the fifth embodiment of the present invention. 10A is a side view showing a scaffolding support pipe insertion structure formed by the scaffolding support pipe insertion method shown in FIG. 9, and FIG. 10B is a plan view of the scaffolding support pipe insertion structure.

Below, we will explain the scaffolding support pipe insertion method, which is an embodiment of the present invention, based on Figures 1 to 10.

First, a scaffolding support pipe insertion method according to a first embodiment of the present invention will be described with reference to Figures 1 and 2. As shown in Figures 1(a) to (d), the scaffolding support pipe insertion method according to this embodiment is a method in which a scaffolding support pipe 5 is inserted through a pair of through holes 3, 4 that are opened in the peripheral walls 1a, 1b of a large cylindrical structure 1, such as a radiant section constructed on top of a converter in a steelworks, so as to communicate with each other across the internal space 2 of the cylindrical structure 1.

As shown in FIG. 1(a), through holes 3, 4 are opened in the peripheral walls 1a, 1b of the cylindrical structure 1, and cylindrical protrusions 3a, 4a communicating with the through holes 3, 4 are provided on the peripheral walls 1a, 1b around the through holes 3, 4. The openings 3a, 4b of the protrusions 3a, 4a are closed by closing plates 6a, 6b, respectively. In addition, a guide roller unit 7 is attached via a hinge 8 to the outer periphery of the protrusion 3a of one of the through holes 3 near the opening 3b. The guide roller unit 7 has multiple rotating rollers 7a, 7b arranged in parallel at a predetermined distance in the vertical direction. During converter operation, the guide roller unit 7 is on standby in a state (open state) away from the closing plate 6a that closes the opening 3b, as shown in FIG. 1(a).

When starting the work of inserting the scaffolding support pipe 5, as shown in Figure 1 (b), the closing plate 6a that was blocking the opening 3b on one side of the through-hole 3 is removed, and then the guide roller unit 7 is rotated around the hinge 8 and set so that the guide roller unit 7 covers the opening 3b. In addition, the closing plate 6b that was blocking the opening 4b on the other side of the through-hole 4 is also removed, exposing the opening 4b.

As shown in FIG. 1(b), a socket 5c with a larger diameter than the outer diameter of the base end 5b and an extension pipe 5d with a smaller diameter than the inner diameter of the base end 5b are welded in series to the base end 5b of the scaffolding support pipe 5 near the guide roller unit 7 on the outside of the peripheral wall 1a, and are integrated with the scaffolding support pipe 5.

Next, as shown in FIG. 1(c), the tip 5a of the scaffolding support pipe 5 is inserted between the rotating rollers 7a, 7b of the guide roller unit 7, and multiple workers M1, M2 work together to support the extension pipe 5d that is integrated with the scaffolding support pipe 5 while pushing the entire scaffolding support pipe 5 toward the guide roller unit 7. When the tip 5a of the scaffolding support pipe 5, which is moving through the internal space 2 toward the through hole 4, reaches a position a predetermined distance D (e.g., 1 m) from the through hole 4, the pushing operation is temporarily stopped.

Next, worker M3, who is waiting outside the opening 4b on the through hole 4 side, holds the base end 9b of the auxiliary pipe 9, which has a tip 9a whose outer diameter is smaller than the inner diameter of the tip 5a of the scaffolding support pipe 5, and inserts the tip 9a from the opening 4b through the through hole 4 into the internal space 2, and inserts the tip 9a of the auxiliary pipe 9 into the tip 5a of the scaffolding support pipe 5, which is waiting at a position a predetermined distance D away from the through hole 4.

Next, while worker M3 holds the base end 9b of the auxiliary pipe 9, workers M1 and M2 push the extension pipe 5d toward the guide roller unit 7, and the entire scaffolding support pipe 5 moves toward the through-hole 4, with the tip 5a of the scaffolding support pipe 5 swallowing up the tip 9a side of the auxiliary pipe 9.

After this, as shown in FIG. 1(d), when the tip 5a of the scaffolding support pipe 5 is exposed from the opening 4b of the protrusion 4a on the through-hole 4 side, the movement of the scaffolding support pipe 5 is stopped, and the auxiliary pipe 9 is removed from the tip 5a of the scaffolding support pipe 5, completing the insertion of the scaffolding support pipe 5. Note that in the process shown in FIG. 1(d), the socket 5c exposed on the outside of the guide roller unit 7 also functions as a stopper.

The scaffolding support pipe insertion method shown in Figure 1 allows a scaffolding support pipe 5 to be inserted into the peripheral walls 1a, 1b of a large cylindrical structure 1, such as a radiant section constructed on top of a converter in a steelworks, so as to communicate with a pair of through holes 3, 4 that are opened in opposing positions across the internal space 2 of the cylindrical structure 1. This scaffolding support pipe insertion method also allows the formation of a scaffolding support pipe insertion structure in which the base end 5b of the scaffolding support pipe 5 is exposed from one of the through holes 3 and the tip end 5a is exposed from one of the through holes 4, as shown in Figure 2.

In this way, the scaffolding support pipe insertion method shown in Figures 1(a) to (d) allows the work of inserting a scaffolding support pipe 5 into a large cylindrical structure 1 to be carried out safely and efficiently.

In addition, the scaffolding support pipe insertion method shown in Figure 1 has the following advantages:
(1) The scaffolding support pipes can be inserted and erected without the need for workers to enter the inside of the cylindrical structure.
(2) By adding an extension pipe and an auxiliary pipe to the scaffolding support pipe, insertion operability is improved and the scaffolding support pipe can be safely inserted to the end.
(3) By supporting the weight of the scaffolding support pipes with guide rollers, the weight of the scaffolding support pipes borne by workers can be reduced.
(4) Resistance when inserting the scaffolding support pipe is reduced, making it possible to insert it smoothly.
(5) It becomes easier to control the insertion direction of the scaffolding support pipe.

Next, we will explain the scaffolding support pipe insertion method, which is the second embodiment of the present invention, based on Figures 3 and 4.

As shown in FIG. 3(a), through holes 3, 4 are provided in the peripheral walls 1a, 1b of the cylindrical structure 1, and cylindrical protrusions 3a, 4a that communicate with the through holes 3, 4 are provided on the peripheral walls 1a, 1b around the through holes 3, 4. The openings 3a, 4b of the protrusions 3a, 4a are closed by closing plates 6a, 6b, respectively.

Next, as shown in FIG. 3(b), the closing plate 6a that was blocking the opening 3b on one side of the through-hole 3 is removed, and then the guide roller unit 7 is rotated around the hinge 8 and set so that the guide roller unit 7 covers the opening 3b. Also, the closing plate 6b that was blocking the opening 4b on the other side of the through-hole 4 is removed, exposing the opening 4b.

As shown in FIG. 3(b), a socket 5c and a short pipe member 5f, each having a larger diameter than the outer diameter of the base end 5b, are welded to the base end 5b of the scaffolding support pipe 5, which is disposed near the guide roller unit 7 on the outer side of the peripheral wall 1a. A bolt 5e that can advance and retreat toward the axis of the short pipe member 5f is screwed to the outer periphery of the short pipe member 5f. Since the inner diameter of the socket 5c and the short pipe member 5f is larger than the outer diameter of the extension pipe 5d, the extension pipe 5d can be inserted through the short pipe member 5f and the socket 5c and stored on the base end 5b side inside the scaffolding support pipe 5. The extension pipe 5d stored on the base end 5b side inside the scaffolding support pipe 5 can be fixed in position by tightening the bolt 5e.

When starting the work of inserting the scaffolding support pipe 5, as shown in Figure 3 (b), loosen the bolt 5e and pull out the extension pipe 5d housed inside the base end 5b side of the scaffolding support pipe 5 in a direction away from the short pipe member 5f, and then tighten the bolt 5e to fix it in that state.

Next, the tip 5a of the scaffolding support pipe 5 is inserted between the rotating rollers 7a, 7b of the guide roller unit 7, and multiple workers M1, M2 work together to support the extension pipe 5d that is integrated with the scaffolding support pipe 5 while pushing the entire scaffolding support pipe 5 toward the guide roller unit 7. After this, the work shown in Figure 3(c) is performed, which is the same as the work described based on Figure 1(c).

After this, as shown in FIG. 3(d), when the tip 5a of the scaffolding support pipe 5 is exposed from the opening 4b of the protrusion 4a on the through-hole 4 side, the movement of the scaffolding support pipe 5 is stopped, the auxiliary pipe 9 is detached from the tip 5a of the scaffolding support pipe 5, the bolt 5e is loosened, the extension pipe 5d is inserted (stored) into the inside of the scaffolding support pipe 5 from the short pipe member 5f side, and the bolt 5e is tightened to fix the extension pipe 5d, completing the insertion work of the scaffolding support pipe 5.

By using the scaffolding support pipe insertion method shown in Figure 3, a scaffolding support pipe 5 can be inserted so as to communicate with a pair of through holes 3, 4 that are opened in the peripheral walls 1a, 1b of a large cylindrical structure 1 in a state in which they face each other across the internal space 2 of the cylindrical structure 1. In addition, by using this scaffolding support pipe insertion method, it is possible to form a scaffolding support pipe insertion structure in which the base end 5b of the scaffolding support pipe 5 is exposed from one of the through holes 3 and the tip end 5a is exposed from one of the through holes 4, as shown in Figure 4.

In this way, the scaffolding support pipe insertion method shown in Figures 3(a) to (d) allows the work of inserting a scaffolding support pipe 5 into a large cylindrical structure 1 to be carried out safely and efficiently.

The scaffolding support pipe insertion method shown in Figure 3 has the same advantages as the scaffolding support pipe insertion method shown in Figure 1 described above, but also has the advantage that the extension pipe can be stored inside the scaffolding support pipe, ensuring sufficient working space around it.

Next, we will explain the third embodiment of the present invention, the scaffolding support pipe insertion method, based on Figures 5 and 6.

As shown in FIG. 5(a), a support means for supporting the scaffolding support pipe 5 so that it can move in the longitudinal direction is disposed at a location away from the closing plate 6a that closes the opening 3b of the protruding portion 3a of one of the through holes 3. The support means includes a plurality of horizontal bars 11a, 11b arranged in a direction intersecting with the insertion direction of the scaffolding support pipe 5, a support post 10 erected vertically at a location away from the horizontal bar 11a, and a guide pipe 12 arranged above the horizontal bars 11a, 11b in a direction intersecting with the horizontal bars 11a, 11b. The base end 12b of the guide pipe 12 is fixed to the support post 10 via a connecting member 13.

As shown in FIG. 5(a), the scaffolding support pipe 5 is placed on the horizontal bars 11, 12. At this time, the guide pipe 12 penetrates the inside of the scaffolding support pipe 5, and its tip 12a is exposed from the tip 5a of the scaffolding support pipe 5. In addition, a socket 5c with a diameter larger than the outer diameter of the base end 5b is welded to the base end 5b of the scaffolding support pipe 5.

When starting the work of inserting the scaffolding support pipe 5, as shown in Figure 5 (b), the closing plate 6a that was blocking the opening 3b on one side of the through-hole 3 is removed, and then the guide roller unit 7 is rotated around the hinge 8 and set so that the guide roller unit 7 covers the opening 3b. Also, the closing plate 6b that was blocking the opening 4b on the other side of the through-hole 4 is removed, exposing the opening 4b.

Furthermore, the tip 14a side of the extension pipe 14 is inserted and clamped between the rotating rollers 7a, 7b of the guide roller unit 7, and the tip 14a is caused to protrude into the internal space 2 through the through hole 3, and in this state, the base end 14b of the extension pipe 14 is welded to the tip 12a of the guide pipe 12.

Next, as shown in FIG. 5(c), workers M1 and M2 work together to move the entire scaffolding support pipe 5 along the longitudinal direction of the guide pipe 12 toward the through hole 3, and the tip 5a of the scaffolding support pipe 5 is inserted into the internal space 2 of the cylindrical structure 1 via the through hole 3 while the guide pipe 12 and extension pipe 14 remain in that position. When the tip 5a of the scaffolding support pipe 5 reaches a position a predetermined distance D away from the through hole 4, the insertion operation is temporarily stopped.

Next, worker M3, who is waiting outside the opening 4b on the through hole 4 side, holds the base end 9b of the auxiliary pipe 9, which has a tip 9a whose outer diameter is smaller than the inner diameter of the tip 5a of the scaffolding support pipe 5, and inserts the tip 9a from the opening 4b through the through hole 4 into the internal space 2, and inserts the tip 9a of the auxiliary pipe 9 into the tip 5a of the scaffolding support pipe 5, which is waiting at a position a predetermined distance D away from the through hole 4.

Next, while worker M3 holds the base end 9b of the auxiliary pipe 9, workers M1 and M2 push the base end 5b side of the extension pipe 5 towards the guide roller unit 7, and the entire scaffolding support pipe 5 moves towards the through-hole 4 with the tip 5a of the scaffolding support pipe 5 swallowing up the tip 9a side of the auxiliary pipe 9.

After this, as shown in FIG. 5(d), when the tip 5a of the scaffolding support pipe 5 is exposed from the opening 4b of the protrusion 4a on the through-hole 4 side, the movement of the scaffolding support pipe 5 is stopped, and the auxiliary pipe 9 is detached from the tip 5a of the scaffolding support pipe 5, and the insertion of the scaffolding support pipe 5 is completed.

By using the scaffolding support pipe insertion method shown in Figure 5, a scaffolding support pipe 5 can be inserted so as to communicate with a pair of through holes 3, 4 that are opened in the peripheral walls 1a, 1b of a large cylindrical structure 1 in a state in which they face each other across the internal space 2 of the cylindrical structure 1. In addition, by using this scaffolding support pipe insertion method, it is possible to form a scaffolding support pipe insertion structure in which the base end 5b of the scaffolding support pipe 5 is exposed from one of the through holes 3 and the tip end 5a is exposed from one of the through holes 4, as shown in Figure 6.

In this way, the scaffolding support pipe insertion method shown in Figures 5(a) to (d) allows the work of inserting a scaffolding support pipe 5 into a large cylindrical structure 1 to be carried out safely and efficiently.

In addition, the scaffolding support pipe insertion method shown in Figure 5 has the same advantages as the scaffolding support pipe insertion method shown in Figure 1 described above, and in addition, it has the following advantages.
(1) Since the number of points supporting the weight of the scaffolding support pipe is increased, the weight of the scaffolding support pipe felt by the worker is reduced, improving insertion operability.
(2) Even when there is not enough space to insert the scaffolding support pipes, it is possible for a small number of people to insert them.

Next, we will explain the fourth embodiment of the present invention, the scaffolding support pipe insertion method, based on Figures 7 and 8.

As shown in FIG. 7(a), through holes 3, 4 are provided in the peripheral walls 1a, 1b of the cylindrical structure 1, and cylindrical protrusions 3a, 4a that communicate with the through holes 3, 4 are provided on the peripheral walls 1a, 1b around the through holes 3, 4. The openings 3a, 4b of the protrusions 3a, 4a are closed by closing plates 6a, 6b, respectively.

Next, as shown in FIG. 7(b), the closing plates 6a, 6b that closed the openings 3a, 4b of the protruding parts 3a, 4a in FIG. 7(a) are removed to expose the openings 3a, 4a. The scaffolding support pipe 5 is placed near the opening 3b on the outside of the peripheral wall 1a. A socket 5c with a larger diameter than the outer diameter of the base end 5b and an extension pipe 5d with a smaller diameter than the inner diameter of the base end 5b are welded in series to the base end 5b of the scaffolding support pipe 5, and are integrated with the scaffolding support pipe 5.

Next, as shown in FIG. 7(c), the tip 5a of the scaffolding support pipe 5 is inserted into the internal space 2 via the opening 3b and through-hole 3, and multiple workers M1 and M2 work together to support the extension pipe 5d that is integrated with the scaffolding support pipe 5 while pushing the entire scaffolding support pipe 5 toward the other through-hole 4. When the tip 5a of the scaffolding support pipe 5 reaches a position a predetermined distance D (e.g., 1 m) from the through-hole 4, the pushing operation is temporarily stopped.

Next, worker M3, who is waiting outside the opening 4b on the through hole 4 side, holds the base end 9b of the auxiliary pipe 9, which has a tip 9a whose outer diameter is smaller than the inner diameter of the tip 5a of the scaffolding support pipe 5, and inserts the tip 9a from the opening 4b through the through hole 4 into the internal space 2, and inserts the tip 9a of the auxiliary pipe 9 into the tip 5a of the scaffolding support pipe 5, which is waiting at a position a predetermined distance D away from the through hole 4.

Next, while worker M3 holds the base end 9b of the auxiliary pipe 9, workers M1 and M2 push the extension pipe 5d toward the through-hole 3, and the entire scaffolding support pipe 5 moves toward the through-hole 4, with the tip 5a of the scaffolding support pipe 5 swallowing up the tip 9a side of the auxiliary pipe 9.

After this, as shown in FIG. 7(d), when the tip 5a of the scaffolding support pipe 5 is exposed from the opening 4b of the protrusion 4a on the through-hole 4 side, the movement of the scaffolding support pipe 5 is stopped, and the auxiliary pipe 9 is detached from the tip 5a of the scaffolding support pipe 5, and the insertion of the scaffolding support pipe 5 is completed.

By using the scaffolding support pipe insertion method shown in Figure 7, a scaffolding support pipe 5 can be inserted so as to communicate with a pair of through holes 3, 4 that are opened in the peripheral walls 1a, 1b of a cylindrical structure 1 in a state in which they face each other across the internal space 2 of the cylindrical structure 1. In addition, by using this scaffolding support pipe insertion method, a scaffolding support pipe insertion structure can be formed in which the base end 5b of the scaffolding support pipe 5 is exposed from one of the through holes 3 and the tip end 5a is exposed from one of the through holes 4, as shown in Figure 8.

In this way, the scaffolding support pipe insertion method shown in Figures 7(a) to (d) allows the work of inserting the scaffolding support pipe 5 into the large cylindrical structure 1 to be carried out safely and efficiently.

In addition, the scaffolding support pipe insertion method shown in Figure 7 has the following advantages:
(1) The scaffolding support pipe can be installed without the worker having to enter the inside of the cylindrical structure. (2) By adding an extension pipe and an auxiliary pipe, insertion operability is improved and the scaffolding support pipe can be safely inserted all the way to the end.

Next, we will explain the fifth embodiment of the present invention, the scaffolding support pipe insertion method, based on Figures 9 and 10.

As shown in FIG. 9(a), through holes 3, 4 are provided in the peripheral walls 1a, 1b of the cylindrical structure 1, and cylindrical protrusions 3a, 4a that communicate with the through holes 3, 4 are provided on the peripheral walls 1a, 1b around the through holes 3, 4. The openings 3a, 4b of the protrusions 3a, 4a are closed by closing plates 6a, 6b, respectively.

Next, as shown in FIG. 9(b), the closing plates 6a, 6b that were blocking the openings 3a, 4b of the protrusions 3a, 4a in FIG. 9(a) are removed to expose the openings 3a, 4a. The tip 15a of the scaffolding support pipe 15 is inserted into the internal space 2 via the opening 3b and the through hole 3. Worker M3 is waiting near the opening 4b, and worker M4 is waiting in the internal space 2 of the cylindrical structure 1 with a pipe holder 16. The tip of the pipe holder 16 is Y-shaped.

Next, as shown in FIG. 9(c), worker M4 supports the tip 15a of the scaffolding support pipe 15 inserted into the internal space 2 from below using the pipe holder 16, and while maintaining this position, workers M1 and M4 work together to move the entire scaffolding support pipe 15 toward the through-hole 4.

Next, as shown in FIG. 9(d), when the tip 15a of the scaffolding support pipe 15 is exposed from the opening 4b on the through-hole 4 side, worker M3 waiting outside the opening 4b holds the tip 5a of the scaffolding support pipe 15 in his hand and adjusts the position of the scaffolding support pipe 15 in cooperation with worker M1 who is outside the opening 3b on the through-hole 3 side.

After this, as shown in FIG. 4(d), when the tip end 15a of the scaffolding support pipe 15 is exposed from the opening 4b on the through-hole 4 side and the base end 15b is exposed from the opening 43b on the through-hole 3 side, the insertion of the scaffolding support pipe 15 is completed.

By using the scaffolding support pipe insertion method shown in Figure 9, a scaffolding support pipe 15 can be inserted so as to communicate with a pair of through holes 3, 4 that are opened in the peripheral walls 1a, 1b of a cylindrical structure 1 in a state in which they face each other across the internal space 2 of the cylindrical structure 1. In addition, by using this scaffolding support pipe insertion method, a scaffolding support pipe insertion structure can be formed in which the base end 15b of the scaffolding support pipe 15 is exposed from one of the through holes 3 and the tip end 15a is exposed from one of the through holes 4, as shown in Figure 10.

In this way, the scaffolding support pipe insertion method shown in Figures 9(a) to (d) allows the work of inserting a scaffolding support pipe 5 into a large cylindrical structure 1 to be carried out safely and efficiently.

In addition, the scaffolding support pipe insertion method shown in Figure 9 has the following advantages:
(1) No additional equipment or materials, such as a special jig for the insertion hole or an auxiliary pipe, are required; the scaffolding support pipe itself can be inserted.
(2) Even when the working space around the cylindrical structure is narrow or when the number of workers is small, the scaffolding support pipes can be inserted safely and reliably.

The scaffolding support pipe insertion method described based on Figures 1 to 10 is an example of the scaffolding pipe insertion method according to the present invention, and the scaffolding pipe insertion method according to the present invention is not limited to the scaffolding support pipe insertion method according to the embodiment described above.

The scaffolding support pipe insertion method of the present invention can be widely used in the construction of work floor scaffolding that is installed when inspecting or repairing the inside of large cylindrical structures such as radiant sections and dust collection ducts constructed above converters in steelworks, or large chimneys in factories.

REFERENCE SIGNS LIST 1 Cylindrical structure 1a, 1b Peripheral wall 2 Internal space 3, 4 Through hole 3a, 4a Protruding portion 3b, 4b Opening 5, 15 Scaffolding support pipe 5a, 12a, 14a, 15a Tip portion 5b, 12b, 14b, 15b Base portion 5c Socket 5d, 14 Extension pipe 5e Bolt 5f Short pipe member 6a, 6b Closing plate 7 Guide roller unit 7a, 7b Rotating roller 8 Hinge 9 Auxiliary pipe 10 Support 11a, 11b Horizontal bar 12 Guide pipe 13 Connecting member 16 Pipe holder M1, M2, M3, M4 Worker

Claims (4)

A construction method in which a scaffolding support pipe is inserted so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the through holes,
A step of disposing a guide roller in one of the through holes to clamp the scaffolding support pipe so as to be movable in the longitudinal direction;
Fixing an extension pipe to the base end of the scaffolding support pipe;
A step of inserting the tip end side of the scaffolding support pipe into an internal space of the cylindrical structure via the guide roller and one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
A scaffolding support pipe insertion method comprising a step of exposing the tip of the scaffolding support pipe to the outside of the other through hole. A construction method in which a scaffolding support pipe is inserted so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the through holes,
A step of disposing a guide roller in one of the through holes to clamp the scaffolding support pipe so as to be movable in the longitudinal direction;
A step of connecting an extension pipe to the base end of the scaffolding support pipe in a state in which the extension pipe can be inserted and removed from the inside of the scaffolding support pipe in the longitudinal direction;
A step of inserting the tip end side of the scaffolding support pipe into an internal space of the cylindrical structure via the guide roller and one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
A scaffolding support pipe insertion method comprising a step of exposing the tip of the scaffolding support pipe to the outside of the other through hole. A construction method in which a scaffolding support pipe is inserted so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the through holes,
A step of disposing a guide roller in one of the through holes to clamp the scaffolding support pipe so as to be movable in the longitudinal direction;
A step of disposing a support means for supporting the scaffolding support pipe so as to be movable in a longitudinal direction at a position outside the cylindrical structure and away from the guide roller;
a step of inserting a guide pipe into the scaffolding support pipe from a base end of the scaffolding support pipe placed on the support means, and clamping the tip end of the guide pipe protruding from the tip end of the scaffolding support pipe with the guide roller;
A step of moving the scaffolding support pipe along the guide pipe toward the guide roller and inserting it into the internal space of the cylindrical structure through one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
A scaffolding support pipe insertion method comprising a step of exposing the tip of the scaffolding support pipe to the outside of the other through hole. A construction method in which a scaffolding support pipe is inserted so as to communicate with at least a pair of through holes opened in a peripheral wall of a cylindrical structure in a state in which the inner space of the cylindrical structure is sandwiched between the through holes,
Fixing an extension pipe to the base end of the scaffolding support pipe;
A step of inserting a tip end side of the scaffolding support pipe into an internal space of the tubular structure through one of the through holes;
Moving the scaffolding support pipe toward the other through hole;
A step of inserting an auxiliary pipe from the outside of the other through hole and connecting it to the tip of the scaffolding support pipe;
A step of guiding the tip of the scaffolding support pipe toward the other through hole by the auxiliary pipe;
A scaffolding support pipe insertion method comprising a step of exposing the tip of the scaffolding support pipe to the outside of the other through hole.

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