JP2568807B2 - Carry-in device with movable closing wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device with a movable closing wall, and more particularly to a loading / unloading device with a movable closing wall provided in a thick wall in a nuclear facility or the like. Here, the thick wall is
It is a wall having a thickness sufficient to attenuate a shielding target such as radiation by a required amount, for example, a concrete wall having a thickness of about 1 meter. However, the present invention is not limited to concrete as this thickness or material.

[0002]

2. Description of the Related Art Referring to FIG. 8, in a building 1 such as a nuclear facility which requires a high degree of shielding for equipment, equipment installation rooms C1, C2,...
A similar thick wall 2 is provided between the indoor space L in contact with the entrance 10 of the building 1 and the equipment storage area. At the time of construction, an equipment entrance 3 penetrating through the thick wall 2 is appropriately provided, and the equipment is transported to the required installation position through these entrances 3. After the installation is completed, the equipment entrance 3 is completely closed as a continuous portion of the thick wall 2 by a special construction method such as post-cast concrete or a shield block in order to ensure safety.

[0003]

[Problems to be Solved by the Invention] However, as the operation results of the equipment are accumulated, the equipment is taken out of the installation rooms C1, C2,... Or, it became clear that it was necessary to carry in replacement equipment. For this carry-out and subsequent carry-in, a problem has been experienced in which the carrying-in entrance 3 once closed by the above-mentioned special construction method is re-opened, and then a huge amount of cost and labor is required for the work to close it again. In addition, this reopening / reclosure work inevitably involves dust generation, so protection of the equipment also required consideration of dust protection.

In order to avoid this problem, it is conceivable to close the carry-in entrance 3 with a movable door which can be easily opened and closed repeatedly.
The movable door having the same shielding performance as the thick wall 2 was extremely expensive and did not come into practical use.

Accordingly, it is an object of the present invention to provide a re-openable, movable closing-wall entrance apparatus having a considerable shielding performance for thick walls.

[0006]

In order to reopenably close the equipment entrance opening to the thick wall, the following conditions are required. (1) To have the same shielding performance as a thick wall, a considerable weight is required. (2) Remove linear gaps to prevent leakage of radiation and other shielding objects. (3) It has mobility for reopening.

As a result of repeated research and development of a wall body that simultaneously satisfies these conditions, the present inventors have previously developed a movable wall by combining a plurality of foldable partial wall bodies, and have applied for this patent application. It was disclosed in Hei 6-XXXXXX. However, while the partial walls are convenient for transportation and assembly, there is a trouble that the filler material must be filled in the gap between the adjacent partial walls when they are brought into contact with each other to close the entrance, so that the shielding is strengthened. . The present inventors have succeeded in solving this problem by using a single movable metal wall.

Referring to FIG. 1 and FIG. 2, an entrance apparatus with a movable closing wall according to the present invention is provided around a floor entrance 3 penetrating through a thick wall 2 having a high radiation attenuation capacity of a building 1 (see FIG. 8). Closely attached to the wall, top end surface 13 (see FIG. 2) and both side surfaces 4c, 4d
Frame 4 having an inner peripheral surface composed of a floor and a floor 15, an enlarged portion 9 in which one end of the frame 4 is enlarged in the direction of the top end surface 13 and the side surfaces 4 c and 4 d, and an enlarged portion 9 of the frame 4. A thick metal wall 5 having a fitting shape, a guide roller 18 mounted on the top surface of the wall 5, a heavy load roller device 22 mounted on the wall 5, and an upper edge of the enlarged portion 9 of the frame 4. The carry-in position and the carry-in entrance 3 which can be fitted to the thick wall 2 and the surface of the frame 4 and engaged with the guide rollers 18 of the wall 5 to fit the wall 5 to the enlarged frame 9 are completely formed. A guide rail 19 for guiding between an open position and a guide roller 19 of the wall body 5 is pierced in the carry-in / out direction on the top end surface 13a of the enlarged frame portion 9 in communication with the guide rail 19 so as to engage with the guide roller 18. And a guide groove 19a for guiding the wall 5 between the carry-in position and the closed position for closing the carry-in entrance 3 by being fitted into the enlarged portion 9 and the outer periphery of the wall 5 when fitted into the enlarged-frame portion 9 And a burying member 17 inserted between the inner peripheral surface of the frame enlarging portion 9, the entrance 3 is closed by the wall 5 and the burying member 17 in the closed position, and the removal of the burying member 17 and the removal of the wall 5 are performed. It is opened by transfer to the open position, and the wall 5 is made sufficiently thick to give the thick wall 2 a considerable radiation attenuating capability to the carry-in entrance 3 when closed.

Preferably, the frame 4 and the movable wall 5 are made of iron, and the filling metal 17 is formed by a combination of the liner plate 25 and the lead 6. Further referring to FIG. 7, the heavy load roller device 22 can be attached to the movable wall 5 by holding the parallel rollers 40 in a ring shape and connecting the both ends of the parallel rollers 40 to each other in an annular manner, and rotatably holding the parallel belt rollers. And a center plate 44 for carrying a large load. In order to enhance the shielding for the gap between the bottom surface of the wall 5 and the floor surface 15, FIG.
As shown in FIG.
An auxiliary member 20 in the width direction of the carry-in entrance 3 may be provided thereon.

[0010]

Referring to FIGS. 1 and 2, the enlarged portion 9 of the frame 4 is formed at the left end of the carry-in entrance 3 shown in FIG. 2, but is formed at the opposite end. No problem. When the carry-in port 3 is opened, the movable wall 5 is held at a position shown by a dashed line in FIG. In this case, the movable wall 5
The guide roller 18 mounted on the top surface of the frame 4 is engaged with the guide rail 19 fixed to the surface of the thick wall 2 and the top horizontal member 4h of the frame 4, so that the movable wall 5 is reliably and stably free standing. Is kept. Therefore, equipment (not shown) can pass freely through the entrance 3. The guide rail 19 in the illustrated example is detachably attached to the thick wall 2 and the frame 4 by a bracket 21, but may be fixed.

When closing the carry-in port 3, a heavy-load roller device is used.
22 is attached to the wall 5 so as to be movable in the direction of arrow M. If the bottom surface of the wall 5 is seated on the floor of the building when the entrance is opened, an appropriate receiving member (not shown) is attached to the wall 5 by screwing or the like, and a jack (not shown).
It is necessary to float the wall body 5 with. The means for floating the wall 5 in this way belongs to the known art. As shown in FIG. 7, for example, the heavy load roller device 22 is configured such that the ends of a plurality of parallelly arranged rollers 40 are connected to each other in an annular manner by a link 42 via a pin 41, and can be freely rotated on a load-bearing center plate 44. It can be attached to. The length of the ring of roller 40 is
It can be adjusted by the offset link 43. The center plate 44 is connected to the top plate 46 via the side plate 45. In the illustrated example, the top plate 46
Is attached to the wall 5 by a bolt (not shown) fitted into the bolt hole 47a, so that the weight of the wall 5 is reduced by the center plate 44 via the bracket 47, the top plate 46 and the side plate 45. Communicated to
The large number of rollers 40 rotate and move the wall 5 while supporting its weight. However, the heavy load roller device 22 used in the present invention
Is not limited to the structure of FIG. If the bracket 47 is connected to the top plate 46 via a suitable rotating shaft (not shown), the direction of movement of the wheel unit 22 can be switched between the thickness direction of the wall 5 and the width direction. Also, the wall 5
Can be driven by locking one end of a rope (not shown) from a suitable winch to the wall 5 and then winding the rope with the winch or any other suitable known method.

When the wall 5 moves to the carry-in position facing the carry-in entrance 3, the heavy-load roller device 22 that moves in the thickness direction of the thick wall 2 indicated by the arrow S, that is, in and out of the carry-in entrance 3, is shown in FIG. A)
Is attached to the movable wall 5 as shown by the solid line. Next, the wall 5 is fitted in the enlarged portion 9 of the frame 4 by moving in the direction of the arrow S, and between the outer peripheral surface of the wall 5 and the inner peripheral surface of the enlarged frame 9 and the floor surface 15. Insert the deposit 17.

When the wall 5 is closed, the outer peripheral surface of the wall 5 comes into contact with the bent edge of the enlarged portion 9 of the frame 4, so that the linear gap around the wall 5 is separated from the wall bottom 5n (FIG. 4). It is only between the floor 15. Since the filling metal 17 is filled in the gaps on the entire circumference of the wall 5, even if there are linear gaps only on the wall bottom surface 5n, radiation leakage from these gaps can be suppressed as a whole. The wall 5 has an integral structure made of a thick metal and has no gap. Therefore, if the thickness of the metal of the movable wall 5 is selected to be sufficient, it is expected that the thick wall 2 will be given a considerable radiation attenuation capability to the carry-in entrance 3 when closed.

The present inventors made the movable wall 5 of the embodiment of FIGS. 1 and 2 an integral thick iron having a thickness d (FIG. 2A) of about 30 cm, It has been theoretically confirmed that the iron can be made of iron, and by appropriately inserting the filling metal 17 between the wall body 5 and the frame body 4, the entrance 3 at the time of closing can be provided with the radiation shielding ability equivalent to the thick wall 2. .

[0015] Accordingly, the object of the present invention is to provide a "re-openable movable entrance wall-equipped entrance device having a considerable shielding performance for thick walls".

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of FIGS. 1 and 2, it is possible to remove all heavy-load roller devices 22 when the entrance 3 is closed. However, when the heavy load roller device 22 movable in the direction of the arrow M parallel to the surface of the thick wall 2 is not removed from the wall member 5 at the time of closing, the lower end of the vertical member 4a and / or 4b of the frame member 4 A load roller device receiving portion 22a (FIG. 3) can be provided. Further, in order to hold the wall 5 in the closed position, the wall 5 is fixed to the frame 4 by a wall fixing metal 23 and a fixing member 24 such as a bolt.
Can be fixed to the vertical members 4a and 4b, the top horizontal member 4h, and / or the floor surface 15. To stabilize the floor 15, floor members
15a may be attached by the stud dowel 11 so as not to move relative to the concrete structure on the building floor. The filling metal 17 in the illustrated example is composed of, for example, a liner plate 25 and a lead bristle 26 inserted between the bottom surface 5n of the movable wall body 5 and the floor surface 15. It is not limited to.

FIGS. 3 and 4 show an embodiment in which a concave portion is provided in the thick wall 2 at one end of the carry-in entrance 3 and a wall body 5 that moves therein is used. One end of the carry-in port 3 penetrating the thick wall 2 is enlarged toward the top end face and both side faces of the carry-in port, and is enlarged toward one side face beyond the width of the carry-in port to form a recessed portion at the carry-in end face. . The top horizontal member 4h, both side vertical members 4a, 4b and the plate-shaped thick wall side member 4k made of a metal material such as an iron plate are joined to the surface of the thick wall 2 in the recessed portion by welding or the like so that there is no gap. To form a metal frame 4. A top end surface 13a defined by the top horizontal member 4h inside the frame 4 (FIG. 4)
And an inner peripheral surface composed of the inner surfaces of the vertical members 4a and 4b on both sides (FIG. 3) and the floor surface 15, and a thick-wall-side end surface 4j defined by the thick-wall-side end member 4k is formed. Surface and thick wall side end surface 4j
Thus, the internal space of the frame 4 is determined. An opening 3 a (FIG. 4) communicating with the carry-in port 3 is formed in the thick wall side member 4 k, and a movable wall 5 made of a thick metal is disposed in the internal space of the frame 4. This wall body 5 has a closed end face 5s that abuts against the thick wall side end face 4j of the frame body 4.
(FIG. 4), the top surface 5m (FIG. 4) contacting the top end surface 13a of the frame 4, the bottom surface 5n contacting the floor surface 15, and the side surfaces contacting the inner surfaces of the vertical members 4a and 4b on both sides. It has an outer peripheral surface composed of 5p and 5q (FIG. 3).

When the wall 5 to which the heavy-load roller device 22 illustrated in FIG. 7 is attached is moved to the solid line position in FIG. 3, that is, the closed position, the closed end face 5s of the wall 5 becomes the opening of the thick wall side member 4k. The entrance 3 is closed by contacting the thick wall side end surface 4j of the peripheral edge 3a and closing the opening 3a. Between the outer peripheral surface of the wall 5 in the closed position and the inner peripheral surface of the frame 4, that is, between the top surface 5m of the wall 5 and the top end surface 13a of the frame 4, the side surface 5p of the wall 5 and the frame Vertical member 4a of body 4
Between the closed end face 5s along the side face 5q of the wall 5 and the thick wall side end face 4j of the frame 4 in contact therewith, and the bottom face 5n of the wall 5 and the floor If the burial 17 is inserted between each of them, the carry-in port 3 can be sealed. In this case, the gap between the top surface 5m and the side surface 5p of the wall 5 and the inner peripheral surface of the frame 4 opposed to the wall 5 is bent at the thick wall side end surface 4j. Radiation leakage from the gap between the frame 5 and the frame 4 can be suppressed.
When closed, the heavy load roller device 22 may be removed from the wall 5. As shown in FIG. 4, a fixing member 2 is provided between the top horizontal member 4 h of the frame 4 and the wall 5 and between the floor surface material 15 a and the wall 5.
The wall fixing bracket 23 may be attached by 4 to securely hold the wall 5 in the closed position.

When the entrance 3 is to be re-opened after the closing, the wall fixture 23 and the filling 17 are removed, the heavy load roller device 22 is attached to the wall 5, and a suitable winch (not shown) is used. Thus, the wall 5 is moved from the closed position indicated by the solid line in FIG. 3 to the open position indicated by the alternate long and short dash line in FIG.

FIGS. 5 and 6 show an embodiment in which an integral movable wall 5 made of a thick metal is pivotally supported rotatably. One of the entrance and exit ends of the carry-in entrance 3 penetrating through the thick wall 2 is enlarged in the direction toward the top end surface and in the direction toward both side surfaces to form a concave portion. The top horizontal member 4h, both side vertical members 4a and 4b, and the plate-shaped thick wall side member 4k, which are made of a metal material such as an iron plate and adhere to the surface of the thick wall 2 at the recessed portion, so that there is no gap by, for example, welding. The metal frame 4 is formed by bonding. An opening 3a (FIG. 6) communicating with the carry-in port 3 is formed in the thick wall side member 4k. Inside the frame 4, a top horizontal member
The inner peripheral surface consisting of the top end surface 13a determined by 4h (FIG. 6), the inner surfaces of the longitudinal members 4a and 4b on both sides (FIG. 5), and the floor surface 15 is determined.
The inner space of the frame 4 is determined by the inner peripheral surface and the thick wall end surface 4j defined by the thick wall end member 4k. A movable wall 5 made of a thick metal that can be fitted into the internal space of the frame 4 is provided. This wall 5
Has a closed end face 5s (FIG. 6) that can be in close contact with the thick wall side end face 4j of the frame body 4, and further has a top face 5 that contacts the top end face 13a of the frame body 4.
m (FIG. 6), the bottom surface 5n which contacts the floor surface 15, and the vertical members 4 on both sides.
It has an outer peripheral surface composed of side surfaces 5p and 5q (FIG. 5) that abut on the inner surfaces of a and 4b.

A hinge 6 composed of, for example, a hinge 30 with a frame and a hinge 31 with a wall connected by a pivot 7 is attached to the outer surface of one of the vertical members, in the illustrated example, the right vertical member 4b. The hinge 6 separates the thick wall 2 from the closed position shown by the solid line in FIG. 5A and the thick wall side end face 4j in which the wall body 5 is fitted into the internal space of the frame body 4 and is in close contact with the opening peripheral portion of the thick wall side end face 4j. 5 (A) along the surface of FIG. 5 (A) as long as it can be rotated between the open position and the position shown by the alternate long and short dash line, and is not limited to the illustrated example. Carry-in entrance 3
Is closed between the outer peripheral surface of the wall 5 and the inner peripheral surface of the frame 4 at the closed position, that is, between the top surface 5m of the wall 5 and the top end surface 13a of the frame 4, the side of the wall 5 5p ・ 5q and vertical member 4 of frame 4
Fillers 17 are inserted between the inner surfaces of a and 4b and between the bottom surface 5n of the wall 5 and the floor surface 15, respectively. For re-opening after the closure, the wall 5 may be rotated to the open position by the hinge after removing the filling 17. 6, the wall 5 in the closed position is fixed to the vertical side surface 14a of the frame 4 by the wall fixing bracket 23.
And / or fixed to 14b.

Preferably, the inner peripheral surface of the frame 4 is inclined such that the inner peripheral surface of the wall 4 is gradually reduced from the outer side to the inner side in the entrance direction of the carry-in port 3 so that the outer peripheral surface of the wall 5 can be in contact with the inclined inner peripheral surface of the frame 4. The thickness of the gap between the wall 5 and the frame 4 when closed is increased in the thickness direction to enhance the shielding effect.

[0023]

As described above in detail, the carrying-in device with a movable closing wall according to the present invention closes the carrying-in through a thick wall with high shielding performance, and relatively easily opens the once-closed carrying-in. It has the following remarkable effects.

(1) For plant equipment surrounded by a thick wall that requires a high degree of shielding, equipment for maintenance / replacement after the plant operation is started can be economically carried in through a carry-in entrance through the thick wall.
Enables removal and reduction of total plant cost. (2) The integral movable wall for closing the entrance can be attached to the frame so as to be re-openable, and the entrance is made into a unit, so that the on-site installation work period can be shortened. (3) Conventionally, work on peripheral devices had to be performed after completion of the resumption work due to scattering of debris and dust generation due to the resumption work of the carry-in entrance. Can be performed prior to or at the same time as the work for restarting the entrance. (4) It is not necessary to protect and cure peripheral equipment, which is essential for the conventional entrance reopening work. (5) Re-opening and re-closing of entrances for loading and unloading of equipment requiring high shielding is cheaper than expensive door installation and easier than sealing by concrete casting. Can be done quickly. (6) The function of the entrance closing part, for example, the shielding ability, airtightness, watertightness, seismic performance, etc. can be selected and designed to the optimum level according to the application. (7) There is no generation of concrete waste, etc., which has been a problem when the conventional entrance is restarted.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is a sectional view taken along line IIA-IIA in FIG. 1B and an explanatory view of an auxiliary shielding member.

FIG. 3 is an explanatory view of an embodiment of the present invention in which a concave portion is provided in a thick wall.

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

FIG. 5 is an explanatory view of an embodiment of the present invention using a rotary wall.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5 (B).

FIG. 7 is a perspective view of a heavy load roller device.

FIG. 8 is an explanatory diagram of a building having an equipment installation room surrounded by thick walls.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 2 Thick wall 3 Carry-in 4 Frame 5 Movable wall 6 Hinge 7 Pivot shaft 9 Enlarged part 10 Doorway 11 Stud dowel 13 Top end face 14a, 14b: Vertical side, 15 Floor 17 Filling 18 Guide roller 19 Guide Rail 20 Auxiliary shielding 21 Bracket 22 Heavy load roller device 23 Wall fixing bracket 24 Fixing member 25 Liner plate 26 Lead bristle 27 Bracket 30 Hinge with frame 31 Hinge with wall 40 Roller 41 Pin 42 Link 43 Offset link 44 Center plate 45 Side plate 46 Top plate 47 Mounting bracket.

Claims (10)

(57) [Claims] 1. A metal frame which is in close contact with a peripheral wall of an entrance on a floor penetrating through a thick wall and has an inner peripheral surface composed of a top end surface, both side surfaces, and a floor, and the frame at one end of the entrance. An enlarged portion whose inner peripheral surface is enlarged in the direction of the top end surface and both side surfaces, a thick metal movable wall shaped to fit into the enlarged portion, a guide roller provided on a top surface of the wall, and the wall A heavy-load roller device to be attached to the body, attached to the surface of the thick wall and the frame along the upper edge of the enlarged portion, and engaged with a guide roller of the wall to fit the wall to the enlarged portion; A guide rail that guides between a possible carry-in position and an open position where the carry-in port is completely opened; a guide rail that is communicated with the guide rail, is pierced in a top end surface of the enlarged portion in a carry-in / out direction, and A closure that engages a guide roller to fit the wall into the entrance position and the enlarged portion to close the entrance. And a guide groove for guiding between the closed position and the inner peripheral surface of the enlarged portion of the frame body. It is closed by a wall and the filling, and is opened by removing the filling and transferring the wall to an open position, so that the wall is sufficiently thick and the radiation attenuation ability corresponding to the thick wall at the time of closing is reduced. A loading entrance device with a movable closing wall provided at the loading entrance. 2. A concave portion of the surface of a thick wall formed by slightly expanding a peripheral edge of one end of a carry-in port on a floor surface penetrating through a thick wall toward a top end and both sides, and enlarging in one direction a width equal to or larger than the width of the carry-in port. Inner circumference formed of a top horizontal member, both side vertical members, a thick wall side end surface member, and a floor surface member, and a top end surface, both side surfaces, a thick wall side end surface, and a floor surface that are in close contact with the inner surface of the entrance portion and the concave portion. Metal frame having a surface, an opening formed in the thick-wall-side end member in communication with the carry-in port, a closed end surface that can be in close contact with a peripheral portion of the opening on the thick-wall-side end surface, and a peripheral surface in the frame A movable wall made of a thick metal having an outer peripheral surface capable of contacting the wall, a guide roller provided on the top of the wall, a heavy load roller device attached to the wall, and a wall pierced on a top end surface of the frame. To close the peripheral portion of the opening at the end face on the side of the thick wall by engaging with the guide roller of A guide groove for guiding between a chain position and an open position away from the opening, and between the outer peripheral surface of the wall and the inner peripheral surface of the frame at the closed position, and the closed end surface of the wall and the frame And a filling metal inserted between the end wall and the thick wall side end surface, wherein the carry-in entrance is closed by the wall body in the closed position and the filling metal, and the removal of the filling metal and transfer of the wall body to the open position. A loading / unloading device with a movable closing wall, which is opened to make the wall sufficiently thick and to give the thick wall considerable radiation attenuating ability to the loading port when closed. 3. An indentation of a thick wall surface formed by enlarging one end of a carry-in port on a floor surface penetrating a thick wall toward a top end surface and both side surfaces of the carry-in port, and closely attached to a surface of the thick wall in the recess portion. A metal frame having an inner peripheral surface composed of a top end surface, both side surfaces, a thick wall side end surface, and a floor surface formed by a top horizontal member, both side vertical members, a thick wall side end surface member, and a floor surface member; The thick wall side end member has an opening formed in communication with the carry-in port, a closed end surface that can be in close contact with the opening peripheral portion of the thick wall side end surface, and an outer peripheral surface that can contact an inner peripheral surface of the frame body. A movable wall made of a thick metal, which is attached to the outer surface of the vertical member on one side and separates the wall from a closed position where the wall is in close contact with the opening peripheral portion of the end on the thick side, and from the thick end of the frame. A hinge that rotates between an open position, and an outer peripheral surface of the wall body in the closed position. A burying pad inserted between the inner peripheral surface and the floor of the frame, wherein the carry-in entrance is closed by the wall at the closed position and the burying, and the removal of the burying and opening of the wall; A loading / unloading device with a movable closing wall, which is opened by rotation to a position to make said wall sufficiently thick and to give said thick wall considerable radiation attenuating ability to a loading entrance when closed. 4. The carrying-in device according to claim 1, 2 or 3, wherein the frame and the wall are made of iron. 5. A metal liner plate according to claim 1, 2 or 3, wherein said filler metal is inserted between an outer peripheral surface of said wall and an inner peripheral surface and a floor of said frame. And a loading / unloading device with a movable closing wall serving as lead hair. 6. The carry-in entrance according to claim 1, 2 or 3, wherein the carry-in entrance is provided on the floor surface adjacent to a filling metal inserted between a bottom surface of the wall body and a floor surface of the frame body. A loading / unloading device with a movable closing wall provided with an auxiliary shielding member in the width direction. 7. The carry-in entrance device according to claim 1, wherein
The heavy-load roller device is provided with a belt-shaped parallel roller in which both ends of the parallel roller are connected in an annular shape, and a load-bearing center plate that rotatably holds the belt-shaped parallel roller and can be attached to the movable wall body. A loading entrance device with a movable closing wall. 8. The carry-in device according to claim 1, wherein
A loading / unloading device with a movable closing wall, comprising a roller device receiving portion into which the heavy load roller device attached to the wall is fitted into the frame. 9. The carry-in entrance device according to claim 2, wherein
A loading / unloading device with a movable closing wall, comprising a wall fixing member for fixing a closed end surface of the wall at the closed position to a vertical member, a top horizontal member, and / or a floor surface of the frame. 10. The carry-in apparatus according to claim 3, wherein the inner peripheral surface of the frame is inclined so as to gradually decrease from the outside to the inside in the entrance direction of the carry-in port, and the outer peripheral surface of the thick metal wall body. Is a shape which can be brought into contact with the inclined inner peripheral surface of the frame body.