JP2015224534A - Ladder for building unit and suspension preparation method of building unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ladder for allowing an operator to properly get on a building unit.SOLUTION: When a projected corner unit 20A as a building unit is carried to a construction site from a factory by a truck T, preparation work for suspending the projected corner unit 20A by a heavy machine is executed at the construction site. This preparation work includes work for installing a ladder 41 in the projected corner unit 20A. The ladder 41 comprises a ladder body 42, an upper side abutting part 43 capable of abutting on a ceiling girder of the projected corner unit 20A and a lower side abutting part 44 capable of abutting on a floor girder. The upper side abutting part 43 is a hooking part hooked from above on the ceiling girder, and the lower side abutting part 44 is a projection part of projecting toward the thickness direction of the ladder body 42. The ladder 41 holds an installation state to the projected corner unit 20A, by hooking the upper side abutting part 43 on the ceiling girder, and also allowing the lower side abutting part 44 to abut on a side surface of the floor girder.

Description

  The present invention relates to a ladder for a building unit and a method for preparing for lifting a building unit using the ladder.

  As a building such as a house, there is a unit type building constructed by combining a plurality of building units. The unit type building is constructed by building units manufactured at a factory being transported to a building site by a truck, and the building unit is installed at the building site. When a building unit is installed at a construction site, the building unit is lifted by a heavy machine such as a crane with a hanging tool attached.

  As a method of attaching a hanging tool to a building unit mounted on a truck, there is a method in which an operator climbs on a truck or a building unit using a ladder. As a method of climbing onto a truck using a ladder, there are a method of mounting the ladder on a truck bed (see, for example, Patent Document 1), and a method of leaning a ladder standing on the ground against a building unit mounted on the truck. .

JP 2005-313887 A

  However, there is room for improvement in how to climb a building unit using a ladder. For example, in the method of mounting a ladder on a truck bed, since the relative position of the ladder to the building unit depends on the relative position of the building unit to the bed, it is difficult to transfer onto the building unit even if the ladder is used. The situation is likely to happen. Further, in the method of leaning the ladder standing on the ground against the building unit mounted on the truck, there is a concern that the space for standing the ladder cannot be secured around the truck when the truck is stopped in a narrow space.

  The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a ladder that allows an operator to properly ride on a building unit.

  Hereinafter, means and the like effective for solving the above-described problems will be described while showing functions and effects as necessary. In the following, for easy understanding, the corresponding configuration in the embodiment of the invention is appropriately shown in parentheses, but is not limited to the specific configuration shown in parentheses.

  The ladder for a building unit according to the first aspect of the invention is a building unit (building unit 20) having a column (column 21), a ceiling beam (ceiling beam 22), and a floor beam (floor beam 23) before being installed on a building site. In this state, the building unit ladder (ladder 41) is capable of moving up and down on the building unit from the outer peripheral side of the building unit. A ladder main body (ladder main body 42) connected by a tread bar 47), a hook portion (upper abutting portion 43) provided on the ladder main body and hookable on the building unit, and lower than the hook portion A protruding portion (lower contact portion 44) provided in a position and protruding in the thickness direction of the ladder main body, the hook portion being hooked on the ceiling beam, and the protruding portion on the floor beam By kicking abuts the side surface of the outer peripheral side of the building unit, characterized in that it is intended to be attached to the building unit.

  According to the first invention, since the ladder can be mounted on the building unit housing, the operator can ride on the building unit using the ladder regardless of the situation of the building unit. . For example, in a situation where a building unit is mounted on a truck bed, unlike the case where a ladder is mounted on the truck bed, the ladder is climbed to the building unit regardless of the relative position of the building unit to the truck bed. You can change. Further, even when the ladder cannot be set up on the ground or the like around the building unit, the ladder can be properly used by mounting the ladder on the building unit.

  Here, a building unit is generally a single object and a heavy object that is placed on a truck bed in a stable state, unlike an article that is generally transported together by a truck. Even if it is mounted only on the building unit without being mounted on the loading platform or standing on the ground, the mounting state of the building unit is unlikely to become unstable when the operator raises or lowers the ladder. For this reason, the operator can perform the raising / lowering operation | work of a ladder safely.

  In addition, when the ladder is mounted on the building unit, the hook is hooked on the ceiling beam and the protrusion is in contact with the side of the floor beam, so that the protrusion is caused by the load from the worker climbing the ladder. Is pressed against the side surface of the floor girder, so that the mounting state of the ladder to the building unit is properly maintained. For this reason, it is difficult for the situation that the installation state of the ladder becomes unintentionally unsuitable while the worker is moving up and down the ladder.

  As described above, the worker can properly ride on the building unit by attaching the ladder to the building unit.

  According to a second invention, in the first invention, the hook portion extends in the thickness direction of the ladder main body, and is overlapped with an upper overlap portion (upper overlap portion 62) overlapped with an upper surface of the ceiling beam. And an inner overlapping portion (inner overlapping portion 63) that overlaps the side surface of the ceiling unit on the inner peripheral side of the building unit.

  According to the second invention, in the state where the ladder is mounted on the building unit, the fact that the hooking portion is separated from the ceiling beam is regulated by the inner overlapping portion. Therefore, the safety when the operator raises and lowers the ladder. Can be increased. In addition, since the upper overlapping portion is superimposed on the ceiling beam, it is possible to prevent the ladder from being displaced up and down unintentionally while the operator is moving up and down the ladder.

  In a third invention, in the second invention, the building unit includes a support bracket (roof bracket 71) provided on the ceiling beam and capable of supporting a roof base material provided on the building unit. The support bracket has an upward extension (extension plate part 73) extending upward from the upper surface of the ceiling beam. In the hook, the hook is the ceiling beam. A storage part (storage part 43a) that stores the upper extension part when it is hooked on is formed by the upper overlapping part being recessed upward.

  According to the third invention, since the storage portion is formed in the hook portion of the ladder, even if the ceiling bracket of the building unit is provided with the support bracket for the roof base, the upward extension portion of the support bracket is provided. By storing in the storage portion of the hook portion, it is possible to avoid the deformation or breakage of the support bracket accompanying the attachment of the ladder. Therefore, it can suppress that the mounting position of the ladder with respect to a building unit is restrict | limited by a support bracket.

  According to a fourth invention, in any one of the first to third inventions, the ladder main body is disposed on an upper main body portion (upper main body portion 56) provided with the hook portion and below the upper main body portion. And a lower main body portion (lower main body portion 57) provided with the protruding portion, and the upper main body portion and the lower main body portion are connected to be separable or foldable. It is formed.

  According to the fourth invention, in the ladder main body formed by the plurality of main body portions, the hooking portion and the protruding portion are attached to different main body portions, so that the separation distance between the hooking portion and the protruding portion is set. In this case, it can be avoided that the distance is limited by the length of the main body. For this reason, it is possible to dispose the hooking portion and the protruding portion at an appropriate position on a ladder that is a building unit having a large height as a building unit. In addition, since the ladder body is separated or folded into a plurality of body parts, it is easy to carry the ladder together with the building unit.

  According to a fifth invention, in any one of the first to fourth inventions, a magnet (magnet) that holds the projecting portion in contact with the floor girder by being adsorbed by the floor girder. 54).

  According to the fifth invention, in a state where the ladder is mounted on the building unit, the state in which the protruding portion is in contact with the side surface of the floor beam is held by the magnet's attracting force, so the mounting state of the ladder is not intended. It is even less likely to become unsuitable.

  Here, in the ladder mounted on the building unit, the hooked portion hooked on the ceiling beam bears the load on the ladder, so the ladder is mounted even if the protruding portion does not bear the load. Is retained. Therefore, as in the present invention, by using the magnet, the mounting state of the ladder can be properly maintained even if priority is given to the ease of attaching and detaching the protruding portion to the floor beam rather than the load burden due to the protruding portion.

  In a sixth invention, in any one of the first to fifth inventions, the projecting portion includes an outer overlapping portion (outer overlapping portion 92) that contacts an outer peripheral side surface of the building unit in the floor beam. A lower overlapping portion (lower overlapping portion 94) that extends in the thickness direction of the ladder main body and overlaps the lower surface of the floor beam.

  According to the sixth invention, when the ladder is mounted on the building unit, the lower overlapping portion of the protruding portion is caught on the lower surface of the floor beam, so that the upper end portion of the ladder is separated from the ceiling beam. In this way, the ladder can be prevented from falling.

  A lifting preparation method for a building unit according to a seventh aspect of the invention is a lifting preparation method for a building unit which is performed as a preparation for lifting a building unit using a lifting tool (hanging tool 81), and is mounted on a truck bed. A mounting step of mounting the ladder according to claim 1 on a building unit, a step of riding an operator on the building unit with the ladder, and a step of mounting the hanging tool on the building unit by the worker, A step of lifting the unit with the lifting tool to float the building unit from the loading platform while the ladder is mounted, and the operator adjusts the balance of the building unit by changing the state of the lifting tool. And after the building unit is lowered, it is placed on the loading platform again, and after the worker gets off the building unit with the ladder. Characterized in that it comprises a step of removing the ladder from the building unit, and a step of lifting by said hanging member to move the building units from the loading platform.

  When a building unit mounted on a truck bed is lifted and installed on a construction site, it is difficult to install the building unit in an appropriate state if the building unit is not well balanced when lifted. For this reason, the building unit is temporarily lifted to the extent that it is separated from the truck bed, and the lifting of the building unit is adjusted in that state. However, when the ladder is mounted on the truck bed or when the ladder is standing on the ground, when the building unit is once lifted, the building unit may come into contact with the ladder or the ladder may fall down. Since there is a concern, it is necessary to perform the work of attaching and detaching the ladder before and after the work for adjusting the lifting balance.

  On the other hand, according to the seventh invention, in order to mount the ladder to the building unit in the mounting process, the worker rides on the building unit and attaches the hanging tool, the work of temporarily lifting the building unit, the building There is no need to attach or detach the ladder while performing various operations such as adjusting the lifting balance of the unit, or performing an operation in which the operator gets off the building unit using the ladder. Therefore, it is possible to reduce the work burden regarding the preparation work before lifting the building unit and the lifting work of the building unit.

  In the eighth invention, in the seventh invention, an outer wall portion (outer wall long side portion 35a, which forms the outer wall of the building when the building is built including the building unit is formed on the outer peripheral portion of the building unit. An outer wall short side portion 36a) and an indoor portion (indoor long side portion 35b, indoor short side portion 36b) disposed inside the building, and in the mounting step, the indoor portion of the building unit Is attached to the ladder.

  According to the eighth aspect of the invention, the ladder is attached to the indoor portion where the outer wall does not exist, so that the outer wall is not damaged when the ladder is attached. For this reason, since it is not necessary to perform the preparatory operation | work which attaches a curing sheet to a building unit or a ladder before attaching a ladder to a building unit, the work burden at the time of attaching a ladder to a building unit can be reduced.

  In a ninth invention, in the eighth invention, in the building unit formed in a rectangular parallelepiped shape, the indoor portion is provided in a state of being spanned between adjacent side portions, and the indoor portion includes the adjacent unit. Indoor pillars (indoor pillars 21B) are arranged as the pillars at the intersections of the matching side surface parts, and the suspension tools are suspension ropes (adjustment ropes 82, standard ropes) to which hooks that can be hooked on the building unit are connected. 83) and a plurality of the suspension ropes, the adjustment rope (adjustment rope 82) having a length adjustment portion (length adjustment portion 82b) capable of adjusting the length dimension of the suspension rope. In the mounting step, a hook connected to the adjustment cord among the plurality of hooks is hooked on an upper end portion of the indoor pillar.

  According to the ninth aspect of the present invention, in the suspension tool, since the plurality of suspension ropes include the adjustment ropes, the operator operates the length adjustment unit to increase or decrease the length of the adjustment ropes. The lifting balance of the unit can be easily adjusted.

  Here, when the building unit is lifted with the suspension rope hooked on the top end of the pillar, the load applied to the suspension rope hooked on the pillar in the indoor part is suspended on the pillar on the outer wall part side. It is assumed that it is smaller than the load applied to the cable. For this reason, since the load applied to the adjustment cable is minimized as a result of the adjustment cable being hooked on the indoor column as in the present invention, the length of the adjustment cable can be easily increased or decreased. it can.

Perspective view of a truck equipped with a protruding corner unit Longitudinal section of a truck equipped with a corner unit Ladder side view The figure for demonstrating the structure of an upper side contact part. The figure which shows the work procedure when lifting the protruding corner unit The figure which shows the hanging tool of the state with which the corner unit was attached Longitudinal section of a truck with a thin unit Schematic diagram of the building Perspective view showing the structure of the building unit Side view around the lower abutment of another ladder

  Hereinafter, an embodiment embodying the present invention will be described with reference to the drawings. In this embodiment, the ladder of the present invention is embodied as a ladder used when constructing a unit type building. First, the unit type building will be described with reference to FIGS. FIG. 8 is a schematic view of the building 10, and FIG. 9 is a perspective view showing the configuration of the building unit 20.

  As shown in FIG. 8, a building 10 such as a house includes a building body 12 provided on a foundation 11 and a roof portion 13 provided above the building body 12. The building body 12 has a first floor portion 14 as a lower floor portion and a second floor portion 15 as an upper floor portion. The roof portion 13 is a land roof (flat roof) and is provided for the second floor portion 15.

  The building 10 is constructed by connecting a plurality of building units 20 to each other, and is a two-story unit type building having a steel frame ramen structure. Each building unit 20 is formed in a rectangular parallelepiped shape as a whole. In the building 10, each of the first-floor portion 14 and the second-floor portion 15 has a plurality of building units 20, and the plurality of building units 20 in the second-floor portion 15 have an outer corner that forms an outer corner portion of the building 10. A unit 20A is included.

  As shown in FIG. 9, the projecting corner unit 20 </ b> A includes a column 21 arranged at four corners, a ceiling beam 22 connected to the upper end (finished finish) of the column 21, and the lower end (lower finish) of the column 21. ), And the pillars 21, the ceiling beams 22 and the floor beams 23 form a rectangular parallelepiped skeleton (frame). The column 21 is made of a square tube-shaped square steel. Further, the ceiling beam 22 and the floor beam 23 are made of channel steel having a U-shaped cross section, and are arranged toward the inside of the unit so that the groove opening sides face each other.

  In the protruding corner unit 20A, a plurality of small ceiling beams 25 are bridged at predetermined intervals between the large ceiling beams 22 that extend along the long side portion (girder surface) and face each other. Similarly, a plurality of floor beams 26 are bridged at predetermined intervals between the large floor beams 23 that extend along the long side portion and face each other. The ceiling beam 25 and the floor beam 26 extend in parallel to the ceiling beam 22 and the floor beam 23 on the short side (wife side) at the same interval. The ceiling beam 25 and the floor beam 26 are each made of lip groove steel. A ceiling member 28 is supported by the ceiling beam 25 and a floor member 29 is supported by the floor beam 26.

  In the projected corner unit 20A, a skeleton formed by the columns 21, the ceiling beams 22 and the floor beams 23 is a unit housing 31, and this unit housing 31 constitutes a building housing.

  In addition to the unit housing 31, the protruding corner unit 20 </ b> A has outer wall panels 32 and 33 attached to the unit housing 31. The outer wall panels 32 and 33 form the outer wall surface of the building 10, and are fixed to the large beams 22 and 23 in a state of being bridged between the ceiling large beam 22 and the floor large beam 23. Of the outer wall panels 32, 33, the first outer wall panel 32 extends in the longitudinal direction of the protruding corner unit 20A, and the second outer wall panel 33 extends in the short direction.

  The outer wall panels 32 and 33 have an outer wall base fixed to the unit housing 31 and an outer wall surface material provided on the outdoor side of the outer wall base. The outer wall base is a base frame having a plurality of long members such as runners and studs, and the outer wall surface material is an exterior material formed of a ceramic siding board or the like.

  The protruding corner unit 20A has a pair of long sides 35a and 35b and a pair of short sides 36a and 36b as side portions. Of the pair of long side portions 35a and 35b, the outer wall long side portion 35a including the first outer wall panel 32 forms an outer wall in a state where the building 10 is constructed, and does not include the first outer wall panel 32. 35b is arrange | positioned indoors in the state in which the building 10 was constructed | assembled. Similarly, of the pair of short side portions 36a and 36b, the outer wall short side portion 36a including the second outer wall panel 33 forms an outer wall in a state where the building 10 is constructed, and does not include the second outer wall panel 33. The short side part 36b is arrange | positioned indoors in the state in which the building 10 was constructed | assembled.

  In the outer peripheral part of the protruding corner unit 20A, the outer wall long side part 35a and the outer wall short side part 36a correspond to the outer wall part, and the indoor long side part 35b and the indoor short side part 36b correspond to the indoor part. In this case, the outer wall portion and the indoor portion are in a state of being spanned between adjacent side portions.

  In the projected corner unit 20A, the four columns 21 include the projected corner column 21A, the indoor long side portion 35b, and the indoor short side, which are arranged at the intersection (boundary portion) between the outer wall long side portion 35a and the outer wall short side portion 36a. The indoor pillar 21B arrange | positioned at the cross | intersection part with the part 36b is contained. In this case, the protruding corner column 21A is disposed at an intermediate position of the outer wall portion, and the indoor column 21B is disposed at an intermediate position of the indoor portion. The four columns 21 include boundary columns 21C and 21D arranged at the boundary between the outer wall portion and the indoor portion. The boundary column 21C is disposed at the boundary portion between the outer wall long side portion 35a and the indoor short side portion 36b, and the boundary column 21D is disposed at the boundary portion between the outer wall short side portion 36a and the indoor long side portion 35b. Yes.

  The protruding corner unit 20A has a roof panel in addition to the outer wall panels 32 and 33. The roof panel has a roof base material such as a roof beam and a field board, and a roof finishing material (roofing material) such as a folded plate material, and is connected to the outer wall panels 32 and 33 while being indoors. It is not disposed above the long side 35b and the indoor short side 36b. That is, the roof panel is not fixed to the ceiling beam 22 in the indoor long side portion 35b and the indoor short side portion 36b. This is to prevent the roof panel from hindering when the projecting corner unit 20A and the adjacent building unit 20 are connected by the unit housings 31.

  The building unit 20 is manufactured in a factory, and then transported from the factory to a building site by a truck or the like. At the construction site, the building unit 20 is lowered to an installation location by being lifted by a heavy machine such as a crane. In addition, the building unit 20 is conveyed from a factory to a construction site in the state covered with the protective sheet. The protective sheet is removed before the building unit 20 is lowered to the installation site at the construction site.

  Here, the case where the protruding corner unit 20A is mounted on the track T will be described with reference to FIGS. FIG. 1 is a perspective view of the track T on which the projected corner unit 20A is mounted, and FIG. 2 is a longitudinal sectional view of the track T on which the projected corner unit 20A is mounted. FIG. 2 shows a view of the longitudinal section of the track T as viewed from the front. Moreover, in FIG. 1, FIG. 2, the figure of the state in which the protection sheet was removed from the corner part 20A in the construction site is shown.

  As shown in FIGS. 1 and 2, the protruding corner unit 20 </ b> A is loaded on the loading platform T <b> 1 of the truck T. In the loading platform T1, the long side portions 35a and 35b of the protruding corner unit 20A extend in the traveling direction of the track T (longitudinal direction of the loading platform T1), the indoor short side portion 36b is disposed on the front side (seat side), and the outer wall The short side part 36a is arrange | positioned at the back side.

  Note that the loading platform T1 of the truck T is provided with a fixing hole for fixing the protruding corner unit 20A to the loading platform T1. The fixing hole is a recessed portion in which the loading plate forming the upper surface (mounting surface) of the loading platform T1 is recessed downward, and the protruding corner unit 20A is a protruding portion that protrudes downward from the column 21 or the floor beam 23. Is placed at a position to be inserted into the fixing hole. A fixing bolt is screwed into the convex portion of the protruding corner unit 20A through the bottom of the fixing hole from below the loading plate, and the protruding corner unit 20A is fixed to the loading platform T1 by this fixing bolt. For this reason, fixing of the protruding corner unit 20A to the loading platform T1 is released by removing the fixing bolt.

  At the construction site, after the truck T is stopped at a predetermined position, preparation work for lifting the protruding corner unit 20A is performed. This preparatory work includes the work of attaching the ladder 41 to the protruding corner unit 20A, and the operator can work in a state of riding on the protruding corner unit 20A by raising and lowering the ladder 41. It becomes possible. The ladder 41 is attached to the ceiling beam 22 and the floor beam 23 at the outer wall long side portion 35a of the protruding corner unit 20A.

  The ladder 41 includes a ladder main body 42 that allows the operator to move up and down, an upper contact portion 43 that contacts the ceiling beam 22 of the protruding corner unit 20A, and a lower contact portion 44 that contacts the floor beam 23. doing.

  The ladder main body 42 has a pair of struts 46 extending in the ascending / descending direction and a plurality of step bars 47 connecting the struts 46. Each of the columns 46 and the tread bar 47 is made of a metal material such as aluminum. The step bars 47 are arranged at predetermined intervals in the longitudinal direction of the columns 46. For example, the length dimension of each support | pillar 46 is 4.8 m, and the space | interval of the tread bar 47 is 30 cm.

  The upper contact portion 43 is a hook portion that can be hooked on the ceiling beam 22 from above, and the lower contact portion 44 is a protruding portion that protrudes in the thickness direction of the ladder body 42. Both the upper contact portion 43 and the lower contact portion 44 are attached to the respective columns 46 of the ladder body 42, and the upper contact portion 43 is disposed at a position near the upper end of the ladder body 42, The contact portion 44 is disposed at a position closer to the lower end of the ladder body 42 below the upper contact portion 43.

  The ladder body 42 includes an upper portion 42a that protrudes upward from the upper contact portion 43, a lower portion 42b that protrudes downward from the lower contact portion 44, and an upper portion 42a and a lower portion 42b. And an intermediate portion 42c disposed on the surface. The length dimension of the upper portion 42a is set to a size (for example, 90 cm) that can function as a handrail when an operator moves from the ladder 41 onto the protruding corner unit 20A. The length dimension of the lower part 42b is made smaller than the separation distance between the ground and the corner unit 20A, and the lower end part of the lower part 42b is arranged above the ground by a predetermined distance (for example, 20 cm). (For example, 90 cm).

  When the ladder 41 is attached to the protruding corner unit 20A, the ascending / descending direction is inclined with respect to the vertical direction. The angle of the ladder main body 42 with respect to the horizontal direction is set to a predetermined angle θ (for example, 75 degrees) at which an operator can safely raise and lower the ladder 41. In this case, the lower end portion of the ladder main body 42 is disposed at a position spaced laterally from the track T, while the upper end portion of the ladder main body 42 is disposed above the protruding corner unit 20A.

  The lower abutting portion 44 holds the ladder 41 at a predetermined angle with respect to the horizontal direction by abutting the tip of the lower abutting portion 44 against the outer surface of the floor girder 23 (the outer peripheral side surface of the protruding corner unit 20A). It will be. The lower abutting portion 44 includes a pair of abutting arm portions 51 attached to the ladder main body 42, a connecting portion 52 that connects the tip portions of the abutting arm portions 51, and the abutting arm portion 51. The supporting arm portion 53 is supported, and the tip end portion of the lower contact portion 44 is formed by the tip end portion of the contact arm portion 51 and the connecting portion 52. When the ladder 41 is mounted on the projecting corner unit 20 </ b> A, the connecting portion 52 extends in the longitudinal direction of the floor girder 23 in a state of being superimposed on the side surface of the floor girder 23.

  The auxiliary arm portion 53 extends obliquely upward from the intermediate portion of the contact arm portion 51 toward the ladder body 42, and is in a state of being bridged between the contact arm portion 51 and the column 46. In the column 46, the fixed position of the auxiliary arm portion 53 is arranged at a position higher than the fixed position of the contact arm portion 51. In this case, the auxiliary arm portion 53 supports the contact arm portion 51 from above against gravity.

  The lower contact portion 44 has a magnet 54 attached to the distal end portion of the contact arm portion 51. The magnet 54 is attracted to the side surface of the floor beam 23 by its magnetic force, so that the tip of the lower contact portion 44 can be held in contact with the floor beam 23. That is, it is possible to hold the ladder 41 in a state where it is mounted on the protruding corner unit 20A. The magnet 54 is disposed below the contact arm portion 51 and is attached to each of the pair of contact arm portions 51.

  The magnet 54 may be attached to the connecting portion 52 at the lower contact portion 44. In addition, the magnet 54 may be provided in the lower contact portion 44 so as to be attracted to the upper surface and the lower surface of the floor beam 23.

  Next, the ladder 41 will be described with reference to FIGS. FIG. 3 is a side view of the ladder 41, and FIG. 4 is a view for explaining the configuration of the upper contact portion 43. In FIG. 3, (a) shows a movement mode of the upper contact portion 43 and the lower contact portion 44, and (b) shows an exploded view of the ladder 41. 4A is an enlarged view of the vicinity of the upper abutting portion 43 of the ladder 41, and FIG. 4B is a perspective view of the vicinity of the upper end portion of the protruding corner column 21A of the protruding corner unit 20A.

  As shown in FIG. 3A, in the ladder 41, the lower contact portion 44 is foldable with respect to the ladder body 42, and the lower contact portion 44 is folded from the protruding state. Transition to the folded state. In the lower contact portion 44, the contact arm portion 51 is pivotally supported with respect to the support column 46, and the auxiliary arm portion 53 is pivotally supported with respect to the contact arm portion 51. . The auxiliary arm unit 53 is detachably fixed to the support column 46 by a fixing member or the like, and the fixing of the auxiliary arm unit 53 to the support column 46 is released, so that the contact arm unit 51 and the auxiliary arm unit 53 are fixed. It can be turned. The lower abutting portion 44 shifts to a folded state by shifting both the abutting arm portion 51 and the auxiliary arm portion 53 along the support column 46, and the auxiliary arm portion 53 is supported by a fixing member or the like. By being fixed to 46, the folded state is maintained.

  As shown in FIG. 3B, the ladder main body 42 has an upper main body portion 56 to which the upper contact portion 43 is attached and a lower main body portion 57 to which the lower contact portion 44 is attached. The main body portions 56 and 57 are detachably connected to each other by a connecting tool such as a bolt. The upper body portion 56 and the lower body portion 57 each have a pair of strut portions 56a and 57a, and the strut portion 56a of the upper body portion 56 and the strut portion 57a of the lower body portion 57 are connected. Thereby, the support | pillar 46 is formed. The pair of column portions 56 a and 57 a are connected by a step bar 47. Further, the connector has a gripping part such as a knob so that an operator can easily attach and detach the connector.

  In the support | pillar 46, the support | pillar parts 56a and 57a are mutually connected in the state piled up. In the upper main body portion 56, a support column portion 56a extends downward from the lowermost step bar 47, and a plurality of connection holes 56b are formed in the extended portion. In the lower main body 57, a support column 57a extends upward from the uppermost step bar 47, and a plurality of connection holes 57b are formed in the extended portion. The upper body portion 56 and the lower body portion 57 are configured such that the connecting members 56b and 57b are inserted into the connecting holes 56b and 57b so that the connecting holes 56b and 57b communicate with each other. It is connected.

  The upper body portion 56 and the lower body portion 57 have substantially the same length. Here, the ladder 41 is transported from the factory to the construction site by being placed on the truck T on which the corner unit 20A is mounted or on the truck on which the other building unit 20 is mounted. For this reason, even if the ladder 41 is large enough to be bridged between the ceiling beam 22 and the floor beam 23 of the protruding corner unit 20A, by dividing it into the upper main body 56 and the lower main body 57, In the truck bed in which the building unit 20 is mounted, it is possible to place the ladder 41 using the surplus portion.

  As shown in FIG. 4A, the upper contact portion 43 is formed in a U shape as a whole. The upper abutting portion 43 includes a base portion 61 attached to the column 46 (the column portion 56a of the upper body portion 56), an upper overlapping portion 62 that is superimposed on the upper surface of the ceiling beam 22 and an inner surface (outside surface) of the ceiling beam 22. And an inner overlapping portion 63 that is overlapped with the inner peripheral side surface of the corner unit 20A. The base portion 61, the upper overlapping portion 62, and the inner overlapping portion 63 are integrally formed of a hard material such as a metal material.

  The base portion 61 is opposed to the inner overlapping portion 63 with the upper overlapping portion 62 interposed therebetween, and is also an outer overlapping portion that is overlapped on the outer surface of the ceiling beam 22 (the outer peripheral side surface of the protruding corner unit 20A). . In the upper abutment portion 43, a recess 65 is formed by the base portion 61, the upper overlap portion 62, and the inner overlap portion 63, and the ceiling abutment 22 is inserted into the recess 65, so that the upper abutment portion 43 is attached to the ceiling. It will be caught by the big beam 22.

  The upper contact portion 43 has a protective layer 66 superimposed on the inner peripheral surface of the recess 65. The protective layer 66 is formed of rubber or a synthetic resin material so that the base portion 61, the upper overlapping portion 62, and the inner overlapping portion 63 do not directly contact the ceiling beam 22. Therefore, the protective layer 66 can suppress the ceiling beam 22 from being damaged by the hard portion of the upper contact portion 43.

  As shown in FIG.4 (b), the roof bracket 71 as a support bracket which supports a roof panel is attached to the ceiling large beam 22 of the exit corner unit 20A. The roof bracket 71 has a fixed plate portion 72 fixed to the upper surface of the ceiling beam 22 and an extending plate portion 73 as an upward extending portion extending upward from the fixed plate portion 72. . The roof bracket 71 is formed of a steel material such as an angle and has a pair of plate portions extending in a direction orthogonal to each other, one plate portion forms a fixed plate portion 72, and the other plate portion is an extended plate portion. 73 is formed. The roof panel is attached to the roof bracket 71 by fixing a roof beam to the upper end portion of the extension plate portion 73.

  As described above, in the protruding corner unit 20A in the state shipped from the factory, the roof panel is not fixed to the ceiling beam 22 of the indoor long side portion 35b, so the upper contact portion 43 is hooked on the ceiling beam 22. Is possible. However, in the indoor long side portion 35 b, the roof bracket 71 is exposed because the roof panel is not fixed to the ceiling beam 22, and when the upper contact portion 43 is hooked on the ceiling beam 22, the roof There is a concern that the bracket 71 may be an obstacle.

  On the other hand, the upper contact portion 43 is formed with a storage portion 43a for storing the extended plate portion 73 of the roof bracket 71. The storage portion 43 a is formed by the upper surface of the upper overlapping portion 62 being recessed upward in the recess 65, and has a size and shape that can store the extended plate portion 73 of the roof bracket 71. The protective layer 66 is not provided in the storage portion 43a. The storage portion 43a is shaped and arranged such that the load from the ladder 41 is applied to the ceiling beam 22 instead of the extension plate portion 73, and even if the protective layer 66 is not provided in the storage portion 43a, The extension plate portion 73 is not easily damaged by the upper overlapping portion 62. The storage portion 43 a is disposed at the end portion on the inner overlap portion 63 side in the upper overlap portion 62.

  When the upper contact portion 43 is hooked on the ceiling beam 22, the roof bracket 71 enters the recess 65 of the upper contact portion 43 together with the ceiling beam 22, and in particular, the extension plate portion 73 is stored in the storage portion 43 a. The In this case, the upper overlapping portion 62 is overlaid on the fixed plate portion 72 of the roof bracket 71 from above.

  In the building 10, the building unit 20 on the first floor portion 14 is a high unit having a height dimension larger than that of the building unit 20 such as the protruding corner unit 20 </ b> A of the second floor portion 15. In the high unit, the distance between the ceiling beam 22 and the floor beam 23 is larger than that of the protruding corner unit 20A. On the other hand, the ladder 41 is configured to be mounted on the high unit in addition to the protruding corner unit 20A.

  As shown in FIGS. 3A and 4A, in the ladder 41, the upper contact portion 43 is movable along the ladder body 42. The upper contact portion 43 is movable to the first position N1 and the second position N2 that is higher than the first position N1, and when the ladder 41 is mounted on the protruding corner unit 20A. Is arranged at the first position N1, and when the ladder 41 is mounted on the high unit, it is arranged at the second position N2.

  The upper contact portion 43 is detachably attached to the support column 46 in a state where the base portion 61 is overlapped with the outer surface of the support column 46. A plurality of mounting holes 46 a are provided in the support column 46 along the longitudinal direction thereof, and a predetermined number (for example, two) of mounting holes 61 a that can communicate with the mounting holes 46 a of the support column 46 are provided in the base portion 61. . The upper abutting portion 43 is attached to the support column 46 by inserting attachments such as bolts through the attachment holes 46a and 61a communicating with each other. The upper abutment portion 43 can be moved to the first position N1 and the second position N2 by removing the fixture. In the support column 46, the attachment hole 61a used for attaching the upper abutment portion 43 is the first one. Different ones are selected at the first position N1 and the second position N2. Note that the fixture has a gripping portion such as a knob so that an operator can easily attach and detach the fixture.

  Next, an operation procedure when lifting the protruding corner unit 20A from the loading platform T1 of the truck T will be described with reference to FIGS. 1 and 4 to 6. FIG. 5 is a diagram showing a work procedure when lifting the projected corner unit 20A, and FIG. 6 is a diagram showing the hanging tool 81 mounted on the projected corner unit 20A.

  As shown in FIG. 5A, the corner unit 20A is mounted on the truck T that has arrived at the construction site. In a state where the truck T is stopped at a predetermined position on the building site, the fixing of the protruding corner unit 20A to the loading platform T1 is released. Further, as shown in FIGS. 1 and 5B, a ladder 41 is mounted on the indoor long side portion 35b of the protruding corner unit 20A. In this case, for example, the ladder 41 is less likely to damage the outer wall panels 32 and 33 and the roof panel than when the ladder 41 is mounted on the outer wall long side portion 35a and the outer wall short side portion 36a. In addition, since the outer wall panels 32 and 33 and the roof panel are less likely to be obstructed when the ladder 41 is mounted, it is possible to avoid the ladder 41 from being unstable.

  Further, when the ladder 41 is mounted on the protruding corner unit 20A, the ladder 41 extends obliquely upward from the lower end toward the protruding corner unit 20A. In addition to the adsorption force to the floor beam 23, the lower contact portion 44 is pressed against the floor beam 23 by the load from the operator. For this reason, the situation where the lower contact portion 44 is separated from the floor beam 23 and the ladder 41 becomes unstable is less likely to occur.

  Then, as shown in FIG.5 (c), an operator climbs the ladder 41, gets on top of the exit corner unit 20A, and attaches the hanger 81 to the exit corner unit 20A. As shown in FIG. 6, the hanger 81 includes ropes 82 and 83 and a coupling ring 84 that couples the ropes 82 and 83, and the coupling ring 84 is connected to a heavy machinery hook that is suspended from a boom of the heavy machinery. It is used by hooking.

  Of the ropes 82 and 83, the adjustment rope 82 is a suspension rope whose length can be adjusted, and the fixed rope 83 is a suspension rope whose length cannot be adjusted. The adjustment rope 82 includes a rope main body 82a formed of a linear member such as a wire or a chain, and a length adjustment portion 82b such as a chain block. The length adjusting portion 82b is disposed at an intermediate position of the rope main body 82a, and the length dimension of the adjustment rope 82 can be increased or decreased by winding and unwinding the rope main body 82a. The standard rope 83 does not have the length adjusting portion 82b, and the length dimension of the standard rope 83 is set by the length dimension of the linear member.

  The length adjusting unit 82b is a length of the adjusting cord 82 by an operator operating an operation member such as a chain in a state where tension is applied, such as a state where the protruding corner unit 20A is lifted by the lifting tool 81. Adjustments can be made.

  A rope hook that can be hooked on the projecting corner unit 20A is attached to the tip of the ropes 82 and 83. As shown in FIG. 4B, in the exit corner unit 20A, a hook hole 86 that can hook a rope hook is provided at the upper end of each column 21 such as the indoor column 21B. The hook hole 86 penetrates the upper surface portion of the column 21 vertically.

  As shown in FIG. 6, the hanger 81 has two adjustment cords 82. Each adjustment cord 82 has one end connected to the coupling ring 84 and the other end connected to a rope hook. In addition, the hanging tool 81 has one standard rope 83. The standard rope 83 is inserted into the coupling ring 84 and is connected to the hooks at both ends thereof. For this reason, the standard rope 83 can be attached to the protruding corner unit 20 </ b> A in a state of being spanned over the hook holes 86 of the two pillars 21.

  In a state in which the lifting tool 81 is attached to the projecting corner unit 20A, the adjustment rope 82 is hooked on each of the indoor pillar 21B and the boundary pillar 21D arranged along the indoor long side part 35b, and arranged along the outer wall long side part 35a. A standard rope 83 is hooked on each of the protruding corner column 21A and the boundary column 21C.

  After attaching the lifting tool 81 to the protruding corner unit 20A, as shown in FIG. 5D, in order to adjust the lifting balance of the protruding corner unit 20A by the lifting tool 81, the protruding corner unit 20A is lifted from the loading platform T1. lift. In this state, the length dimension of the adjusting cord 82 is adjusted so that the protruding corner unit 20A is in a horizontal state.

  Here, in the exit corner unit 20A, the outer wall long side portion 35a and the outer wall short side portion 36a are heavier than the indoor long side portion 35b and the indoor short side portion 36b. It is assumed that it is biased toward the column 21A. Therefore, since the adjustment rope 82 is hooked on the indoor pillar 21B, the weight of the adjustment rope 82 to be lifted or lowered by the adjustment rope 82 is smaller than that in the case where the adjustment rope 82 is hooked to the protruding corner pillar 21A. However, the force required to operate the length adjustment unit 82b can be minimized.

  Since the standard rope 83 is inserted through the connecting ring 84, the distance between the protruding corner column 21A and the boundary column 21C with respect to the connecting ring 84 can be adjusted collectively. In this way, by hooking a single standard rope 83 on two adjacent pillars 21A and 21C, the hooks 81 are hooked at the four corners of the projecting corner unit 20A, so that the four adjusting ropes 82 are not used. However, it is possible to balance the protruding corner unit 20A during lifting.

  When the protruding corner unit 20A is lifted, in the truck T, the loading platform T1 rises with respect to the ground. When the exit corner unit 20A is mounted on the loading platform T1, the height position of the loading platform T1 is at H1, while when the exit corner unit 20A is spaced upward from the loading platform T1, the height of the loading platform T1 is increased by the suspension. The position rises to H2.

  Here, the work of adjusting the lifting balance of the protruding corner unit 20A is performed while the ladder 41 is mounted on the protruding corner unit 20A. Thereby, it is possible to save the labor of remounting the ladder 41 in order for the operator to get off the corner unit 20A. On the other hand, for example, if the ladder 41 is stood on the ground and leaned against the protruding corner unit 20A, there is a concern that the ladder 41 falls down as the protruding corner unit 20A is lifted. Further, if the lower contact portion 44 of the ladder 41 is in contact with the loading platform T1, the lower contact portion 44 is detached from the loading platform T1 as the protruding corner unit 20A is lifted, and the ladder 41 is moved to the protruding corner unit. There is concern about leaving from 20A.

  In addition, since the weight of the ladder 41 is sufficiently small with respect to the weight of the protruding corner unit 20A, whether or not the ladder 41 is attached does not easily affect the lifting balance of the protruding corner unit 20A.

  After adjusting the lifting balance of the protruding corner unit 20A, as shown in FIG. 5E, the protruding corner unit 20A is lowered and placed on the loading platform T1 again. Thereafter, the operator uses the ladder 41 to descend from the exit corner unit 20A and removes the ladder 41 from the exit corner unit 20A. And as shown in FIG.5 (f), the protruding corner unit 20A is lifted in the state where the balance was adjusted, and it installs on the building unit 20 of the 1st-floor part 14 in a construction site.

  Further, in the building 10, when a plurality of building units 20 include thin units 20 </ b> B that are thinner than the other building units 20, the thin units 20 </ b> B are also transported by the truck T and the ladder 41 is mounted. It will be. Here, the thin unit 20B will be described with reference to FIG. FIG. 7 is a longitudinal sectional view of the track T on which the thin unit 20B is mounted. The thin unit 20B is smaller in length in the short direction than other building units 20 such as the projected corner unit 20A, and the thin unit 20B is a half whose length is 1/2. There is a unit.

  As shown in FIG. 7, the thin unit 20B is placed almost at the center of the loading platform T1 in the width direction of the track T. In the thin unit 20B, the indoor long side portion 35b is disposed on the inner side of the loading platform T1. Yes. On the other hand, in the ladder 41, the lower contact portion 44 extends laterally from the ladder body 42, and the lower contact portion 44 is connected to the indoor long side portion in a state where the ladder body 42 is not caught on the loading platform T1. It abuts against the floor beam 23 of 35b. In this case, in the upper position of the loading platform T1, the side space of the thin unit 20B becomes a dead space, but the lower contact portion 44 can be brought into contact with the floor beam 23 using this dead space. it can. The separation distance (entry distance) of the floor beam 23 from the side end of the loading platform T1 is set to be smaller than the extension dimension of the lower contact portion 44 from the ladder body 42.

[Other Embodiments]
The present invention is not limited to the description of the above embodiment, and may be implemented as follows, for example.

  (1) In the above-described embodiment, the lower contact portion 44 of the ladder 41 is configured to be able to contact the side surface of the floor beam 23, but the lower contact portion 44 is added to the side surface of the floor beam 23. It is good also as a structure which can contact | abut at least one of the upper surface and lower surface of the floor big beam 23. FIG.

  For example, as shown to Fig.10 (a), it is set as the structure provided with the hook member 91 which the lower side contact part 44 catches on the floor large beam 23 in an up-down direction. The hook member 91 has an outer overlapping portion 92 that is overlapped with the outer surface of the floor beam 23, an upper overlapping portion 93 that is overlapped with the upper surface of the floor beam 23, and a lower overlapping portion 94 that is overlapped with the lower surface of the floor beam 23. doing. The hook member 91 is made of channel steel having a U-shaped cross section, the web of channel steel is used as the outer overlap portion 92, the upper flange is the upper overlap portion 93, and the lower flange is the lower overlap portion. 94.

  When the hook member 91 is hooked on the floor big beam 23, the floor big beam 23 enters the groove portion of the hook member 91. In this case, when the upper overlapping portion 93 is hooked on the upper surface of the floor girder 23, the ladder 41 can be prevented from falling down in a direction in which the upper end portion of the ladder 41 approaches the protruding corner unit 20A. Moreover, it can control that the ladder 41 falls in the direction in which the upper end part of the ladder 41 leaves | separates from the exit corner unit 20A because the lower side overlap part 94 is hooked on the lower surface of the floor beam 23. For these reasons, in the state where the hook member 91 is hooked on the floor beam 23, the displacement of the ladder 41 is restricted, so that the upper abutting portion 43 is difficult to be detached from the ceiling beam 22.

  In the configuration in which the lower contact portion 44 includes the hook member 91, the upper contact portion 43 is preferably pivotally supported with respect to the support column 46. Thus, after the upper contact portion 43 is hooked on the ceiling beam 22, the hook member 91 is placed on the floor beam 23 while the support 46 (ladder body 42) is rotated while the hooked state of the upper contact portion 43 is maintained. It becomes possible to hook. Thereby, the ladder 41 can be appropriately and reliably mounted on the building unit 20.

  Further, when the lower overlapping portion 94 of the lower contact portion 44 is inserted below the floor beam 23, the protruding corner unit 20A is placed on the loading platform T1 via a spacer such as wood. Is preferred.

  (2) In the above embodiment, when the ladder 41 is mounted on the protruding corner unit 20A, the contact arm portion 51 is in contact with the floor beam 23 as a part of the lower contact portion 44. Any part of the contact part 44 may abut against the floor beam 23. For example, as shown in FIG. 10B, the lower contact portion 44 has a pair of contact units 95 fixed to the ladder body 42 instead of the contact arm portion 51 and the auxiliary arm portion 53. In addition, the front end portions of the contact units 95 are connected by the connecting portion 52.

  In this configuration, the connecting portion 52 is formed of a plate material such as a plywood, and is fixed to each contact unit 95 with a screw or the like in a state where the plate surface is superimposed on the front end surface of the contact unit 95. When the connecting portion 52 comes into contact with the floor beam 23, the plate surface is overlapped with the side surface of the floor beam 23. The height dimension of the connecting portion 52 is substantially the same as the height dimension of the floor girder 23.

  The abutting units 95 are arranged in the longitudinal direction of the upper and lower arms 96 and 97 extending in the thickness direction of the ladder main body 42 in a state where they are vertically arranged. The first connecting portion 98 and the second connecting portion 99 that connect the arm portions 96 and 97 are provided. The upper arm portion 96, the lower arm portion 97, and the first connection portion 98 are formed of a long material such as wood, and the second connection portion 99 is formed of a plate material such as plywood.

  The arm portions 96 and 97 are connected by a first connection portion 98 in a state where their one ends are separated from each other, and are fixed to the column 46 via the first connection portion 98. The first connection part 98 is fixed to the outer side surface of the column 46 with screws or the like in a state of extending along the column 46. The arm portions 96 and 97 are connected by the second connection portion 99 in a state where the end portions on the opposite side to the first connection portion 98 are in contact with or close to each other. The second connecting portion 99 is fixed to the arm portions 96 and 97 with screws or the like in a state of being spanned on the side surfaces of the arm portions 96 and 97, and the connecting portion 52 includes the distal end surfaces of the arm portions 96 and 97 and In a state of being superimposed on the side end surface of the second connection part 99, the arm parts 96 and 97 and the second connection part 99 are fixed with screws or the like.

  In a state where the ladder 41 is mounted on the protruding corner unit 20A, the lower arm portion 97 extends in the horizontal direction, and the upper arm portion 96 extends obliquely downward from the support column 46 toward the floor beam 23. The arm portions 96 and 97 may both extend in the horizontal direction, or both may extend obliquely upward or downward.

  (3) In the above embodiment, the ladder 41 is mounted on the long side 35a of the outer wall of the projected corner unit 20A, but it may be mounted on the long side 35b and the short sides 36a, 36b. For example, when the ladder 41 is mounted on the indoor long side 35b, the ladder 41 is mounted on the first outer wall panel 32 or the roof in a state where the indoor long side 35b is mounted on the ceiling beam 22 and the floor beam 23. It is preferable that the mode is set so as not to contact the panel.

  (4) In the above-described embodiment, the ladder 41 attached to the protruding corner unit 20A extends obliquely upward toward the protruding corner unit 20A. However, the ladder 41 extends in the vertical direction. Also good. For example, the projecting dimension of the lower contact portion 44 from the column 46 is set to a size such that the separation distance of the column 46 with respect to the floor beam 23 is the same as the separation distance of the column 46 with respect to the ceiling beam 22. To do.

  (5) In the above embodiment, the ladder body 41 is configured such that the upper body portion 56 and the lower body portion 57 are separable. However, the body portions 56 and 57 may be folded. For example, the upper main body 56 and the lower main body 57 are connected to each other by a connecting member so as to be rotatable. Even in this case, the ladder 41 can be easily transported by a truck or the like by shifting the main body portions 56 and 57 to the folded state.

  (6) In the above-described embodiment, the upper main body 56 and the lower main body 57 are disposed adjacent to each other in the ladder 41, but an intermediate main body is disposed between the main bodies 56 and 57. May be. Moreover, the ladder 41 may be formed by one main body. In this case, both the upper contact portion 43 and the lower contact portion 44 are attached to one main body portion.

  (7) In the above embodiment, the hanging tool 81 has both the adjusting rope 82 and the standard rope 83, but may have either one.

  DESCRIPTION OF SYMBOLS 10 ... Building, 20 ... Building unit, 21 ... Pillar, 21B ... Indoor pillar, 22 ... Ceiling girder, 23 ... Floor girder, 35a ... Outer wall long side part constituting outer wall part, 35b ... Outer wall short side constituting outer wall part 36a ... Indoor long side part constituting the indoor part, 36b ... Indoor short side part constituting the indoor part, 41 ... Ladder, 42 ... Ladder body, 43 ... Upper contact part as a hook part, 43a ... Storage part 44 ... Lower contact portion as a protruding portion, 46 ... Post, 47 ... Tread, 54 ... Magnet, 56 ... Upper body portion, 57 ... Lower body portion, 62 ... Upper overlap portion, 63 ... Inner overlap portion , 71 ... Roof bracket as support bracket, 73 ... Extension plate part as upward extension part, 81 ... Suspension tool, 82 ... Adjustment line as suspension line, 82b ... Length adjustment part, 83 ... As suspension line Standard rope, 92 ... outer overlap portion, 94 ... lower overlap portion.

Claims (9)

It is a ladder for a building unit that can be moved up and down on the building unit from the outer peripheral side of the building unit in a state before the building unit having a pillar, a ceiling beam and a floor beam is installed on a building site. And
A ladder body in which a pair of struts are connected by a plurality of step bars;
A hook portion provided on the ladder body and hookable on the building unit;
A protrusion that is provided at a position lower than the hook and protrudes in the thickness direction of the ladder body;
With
The building is attached to the building unit by the hook being hooked on the ceiling beam and the projecting portion coming into contact with a side surface of the floor beam on the outer peripheral side of the building unit. Ladder for unit. The hook is
An upper overlapping portion that extends in the thickness direction of the ladder body and is overlapped with an upper surface of the ceiling beam.
An inner overlapping portion that extends downward from the overlapping portion and is overlapped with an inner peripheral side surface of the building unit in the ceiling beam.
The ladder for a building unit according to claim 1, wherein the ladder is provided. The building unit is
Provided on the ceiling beam, has a support bracket capable of supporting the roof base material provided on the building unit,
The support bracket has an upward extension extending upward from the upper surface of the ceiling beam.
In the hook portion, the storage portion that stores the upper extension portion when the hook portion is hooked on the ceiling beam is formed by the upper overlapping portion being recessed upward. The ladder for building units according to claim 2. The ladder body is
An upper body portion provided with the hook portion;
A lower body part disposed on the lower side of the upper body part and provided with the protruding part; and
4. The device according to claim 1, wherein the upper body portion and the lower body portion are connected to each other so as to be separable or foldable. 5. Ladder for the building unit described.   5. The magnet according to claim 1, wherein the projecting portion is provided with a magnet that holds the projecting portion in contact with the floor beam by being attracted to the floor beam. Ladder for building unit described in 1. The protrusion is
An outer overlapping portion in contact with the outer peripheral side surface of the building unit in the floor beam;
A lower overlapping portion extending in the thickness direction of the ladder main body and overlapping the lower surface of the floor beam,
The building unit ladder according to claim 1, wherein the building unit ladder is provided. A method for preparing a building unit to be lifted as a preparation for lifting a building unit using a lifting tool,
A mounting step of mounting the ladder according to claim 1 on the building unit mounted on a truck bed;
An operator rides on the building unit with the ladder, and the operator attaches the hoist to the building unit;
The building unit is lifted from the loading platform while the ladder is mounted by lifting the building unit with the suspension tool, and the operator changes the state of the suspension tool to balance the building unit. The preparation process,
Placing the building unit again on the loading platform by lowering the building unit, and removing the ladder from the building unit after the worker has descended from the building unit with the ladder;
A method for preparing a lifting of a building unit, comprising: The outer peripheral portion of the building unit includes an outer wall portion that forms an outer wall of the building when the building is built including the building unit, and an indoor portion that is arranged inside the building,
8. The building unit lifting preparation method according to claim 7, wherein, in the mounting step, the ladder is mounted on the indoor portion of the building unit. In the building unit formed in a rectangular parallelepiped shape, the indoor portion is provided in a state of being spanned between adjacent side portions, and the indoor portion is provided with an indoor column as the column at the intersection of the adjacent side portions. Is placed,
The suspension has a plurality of suspension ropes connected to hooks that can be hooked on the building unit,
The plurality of suspension ropes include an adjustment rope having a length adjustment unit capable of adjusting the length dimension of the suspension rope,
9. The building unit lifting preparation method according to claim 8, wherein in the mounting step, a hook connected to the adjustment cord among the plurality of hooks is hooked on an upper end portion of the indoor pillar.

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