JP2013049960A - Base structure of square base material and fixing metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a square base material 13 and a fixing metal fitting 2 themselves, to keep build levelness of the square base material 13, and to improve earthquake resistance of the entire wall base by adopting the square base material 13 to a ceiling and the wall base, horizontally disposing and supporting an end of the square base material 13 between studs 12 without directly abutting it using an insertion type fixing metal fitting 2, and elastically receiving and absorbing vibrations of the studs 12 due to an earthquake or the like by the fixing metal fitting 2.SOLUTION: The fixing metal fitting 2 comprises an insertion support part 21 to be inserted to the end of the square base material 13, and a stud attaching part 22 planarly abutted to the stud 12 and provided with a fixing piece 221 whose distal end side is extended from the square base material 13. Both support pieces 212 formed at the insertion support part 21 are pressed to an inner periphery of the square base material 13 to control falling prevention and enable support allowing insertion deviation. By a bend part 223 formed at the stud attaching part 22, falling prevention of the support piece 212 is controlled and vibrations of the stud 12 are absorbed.

Description

  The present invention relates to a ceiling or wall foundation structure that forms an indoor opening such as a lintel of a door or an inspection port, which is configured by using a lightweight steel foundation material that is horizontally placed between standing studs. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base structure and a fixing bracket of a square base material in which a square base material is adopted as a material and an end portion thereof is connected to a stud.

  In general, indoor wall bases such as door lintels and inspection openings are supported by upper and lower runners (ceiling runners and base runners) arranged on the ceiling frame and floor slab, and upper and lower ends between the runners. It is constructed by a base material composed of a plurality of studs standing at predetermined intervals in the horizontal direction and a horizontal base material disposed vertically and horizontally between the studs. As these base materials, lightweight grooved steel (channel material) formed of a thin plate of about 0.6 to 0.8 mm, lightweight square material (hollow material) and the like are employed.

By the way, conventionally, when fixing the horizontal base material of a lintel part between studs, as shown in patent document 1 (refer FIG. 5), the edge part of a channel-type lintel material (5) is notched and both sides are made. The remaining piece is used as a narrow piece (9), which is inserted into the stud (vertical frame 4) with the opening side facing upward, and directly fixed to the screw (10).
Further, as shown in Patent Document 2 (see FIG. 7), a channel-type lintel (horizontal frame member 9) is connected between studs (vertical frame members 6 and 6) at both ends via connecting fittings (10). It is known to be fixed to.

  However, since these all adopt a joint structure in which the stud and the end portion of the lintel (horizontal base material) are integrated and firmly connected and fixed, the indoor wall base such as the lintel portion, As mentioned above, a thin, lightweight steel base material is used, and the base material itself is easily deformed by shaking such as an earthquake. Especially when the stud and the lateral base material vibrate simultaneously, they are firmly integrated. As a result, the end of the horizontal base material itself is deformed due to the stress load applied to the joint, and the horizontal level of the horizontal base material is lost. There is a problem that the opening and closing of the door is hindered, and the earthquake resistance is inferior, and because it is a wall base, the repair work of the deformed base material cannot be easily performed.

JP 2007-308968 A Japanese Utility Model Publication No. 05-003417

  The present invention was devised to eliminate the above-mentioned problems, using a thin lightweight steel base material, and a ceiling or wall base structure in which the end of the base material is connected and fixed to a stud. However, there is no fixed structure that connects the base material end with the stud, and the square base material is adopted as the base material, and the square base material is used by using the insertion-type fixing bracket that is fixed to the stud. It is possible to receive and support by inserting it into the joint structure so that the edge of the square base material does not directly contact the stud, so that installation errors can be absorbed and the vibration of the stud due to earthquake etc. can be elasticized by the fixing bracket. To prevent the deformation of the edge of the square base material and the deformation of the fixing bracket itself, to maintain the support function by the fixing bracket, to maintain the installation level of the square base material, and to the ceiling And improve the earthquake resistance of the entire wall base. And to provide a wall base structure and mounting brackets rectangular base material that can.

In order to solve the above-described problems, the base structure of the square base material of the present invention is erected with a predetermined distance in the horizontal direction with the runners arranged vertically and the upper and lower ends supported between the runners. A plurality of studs, a cylindrical square base material that is horizontally mounted between the studs, and a fixing bracket that fixes the square base material to the stud. In a base structure comprising a wall base, when fixing the square base material to the stud via the fixing bracket, the fixing bracket is inserted into the cutting edge of the square base material and the square base material is inserted. An insertion-type insertion support portion that supports the stud, and a stud attachment portion that has a fixing piece that abuts against the stud and has a distal end extending from the square base material. Standing up in a reverse C-shape upward from both sides of the face piece and the base piece The square base material is expanded to be wider than the width of the square base material, and both side corners in the square base material are formed to have support pieces that receive and receive at the tip portions, while the stud mounting portions are A rising piece bent upward in an L shape from the base piece between the support pieces, and a bent portion bent between the support pieces between the rising piece and the fixed piece. The square base material is inserted into the square base material with both the support pieces sandwiched between them, and the inner periphery of the square base material is pressed against the inner periphery to prevent it from coming off, and the insertion support portion is inserted into the square base material. The fixed piece is screw-fixed to the stud in a state where the displacement is allowed and supported, and the two support pieces are prevented from falling at both ends by the bent portion, and the stud vibration is elastically received and absorbed. The support function of the insertion support part is attached so as to be maintained. It is intended to.
In addition, in order to solve the above problems, the square base material fixing bracket of the present invention is erected with a predetermined interval in the lateral direction so as to constitute a ceiling / wall base such as a lintel portion of a door or an inspection port. A fixing bracket that is attached to a stud and supports both ends of a cylindrical rectangular base material that is horizontally mounted between the studs, and the fixing bracket is inserted into the cutting edge of the square base material. And an insertion-type insertion support portion that supports the square base material, and a stud mounting portion that has a fixed piece that abuts against the stud and has a distal end extending from the square base material. The support part is a base surface piece and is bent upward from both sides of the base surface piece so as to be bent upward and widen wider than the width of the square base material. The stud mounting part is formed in a front part with a support piece for supporting and receiving at the tip part. A rising piece that is bent upward in an L shape from a base piece between the two supporting pieces, and a bent portion that is bent between the two supporting pieces between the rising piece and the fixed piece. The fixing bracket is inserted into the square base material by sandwiching both the support pieces, and is pressed against the inner periphery of the square base material to prevent it from coming off, and the insertion support portion It is possible to support by allowing insertion displacement with respect to the square base material of the above, the bent portion, the both supporting pieces at the both ends thereof to prevent the support pieces from falling down, and the vibration of the stud is elastically received and absorbed, The support function of the insertion support part is configured to be maintained.

Since the present invention is configured as described above, a thin steel lightweight steel base material is used, and the end portion of the base material is connected to and fixed to the stud. A square base material is used as the base material to be inserted, and the insertion support part (both support pieces) of the fixing bracket is pressed against the inner periphery of the base material so that it can be prevented from coming off. It is only necessary to fix the fixing piece exposed from the base material to the stud with screws, and not only the fixing work can be done easily, but also the fixing metal can be inserted into the square base material and joined, so that installation errors are absorbed. However, it is not necessary to cut the length of the square base material with a strict abutting dimension, it is possible to cut it slightly shorter, simplifying the fixing work, ceiling and wall base Improve workability and efficiency during construction It is possible.
Moreover, even after the construction, even if the stud vibrates due to an earthquake or the like, the stud mounting part and both support pieces are independent, and the bent part restricts both support pieces from falling over at both ends. In addition to not impairing the repressing function to the inner periphery of the square base material, it also elastically receives the vibration of the stud in the horizontal direction of the square base material cut short and absorbs the insertion misalignment. In addition, the vibration of the stud with respect to the front and rear direction of the ceiling and the wall base can be made between the base piece and the lower inner peripheral face and between the support piece and the lateral inner wall face. By the action of the elastic restoring force of the support piece in the gap direction, swinging with tilting is made in the front-rear direction (the direction around the horizontal cylinder core), so that the vibration of the stud can be absorbed without being directly transmitted. As a result, the stress load on the joint portion is reduced and rattling is prevented, the deformation of the square base material end and the fixing bracket (insertion support portion) is prevented, and the support function can be maintained. Permanent installation accuracy of the square base material can be maintained, and the earthquake resistance of the entire ceiling and wall base can be improved, thereby contributing to the maintenance of structural quality characteristics.

  Hereinafter, a base structure and a fixing metal fitting of a square base material which exemplifies embodiments of the present invention as preferred embodiments will be described in detail with reference to the drawings. Needless to say, the present invention is not limited to the base structure of the above-described conventional indoor wall opening and ceiling opening, but can be applied to other construction steel base material structures including partition walls.

  FIG. 1 is a bracket for fixing a square base material according to an embodiment of the present invention, FIG. 2 is an overall view of a main part of a lintel forming an opening of an indoor door, and FIG. It is an AA arrow line view of FIG. 2 explaining a moving space. As shown in these drawings, the fixing metal fitting 2 uses a thin steel plate material of about 0.6 mm, and has a runner 11 arranged vertically and upper and lower ends supported between the runners 11 in a predetermined lateral direction. Insertion that is attached to a plurality of studs 12 that are erected at intervals, and that supports both ends of a cylindrical rectangular base material 13 that is horizontally placed between the studs 12 by inserting them into the cut edge. It is composed of a built-in insertion support portion 21 and a stud mounting portion 22 having a fixing piece 221 that is abutted against the stud 12 and has a distal end extending from the square base material 13, and is integrally formed in an L shape as viewed from the side. It is press-molded. In addition, the square base material 13 is formed with two reinforcing ribs 131 on the upper and lower sides that protrude inside the cylinder.

  The stud 12 in this embodiment uses the same member as the square base material 13, and the stud 12 and the square base material 13 are assembled flush with each other so that a frame member such as a door frame can be easily installed. . In addition, the wall base of the lintel portion 10 is further erected on the upper surface of the square base material 13 laid horizontally between the studs 12 by using the fixing bracket 2 and a plurality of square base materials 13 are erected. The wall base structure is supported by the runner 11. When forming an inspection port (not shown), the square base material 13 is horizontally placed with a predetermined opening interval between the studs 12 in the vertical direction, and each of the opposing square base materials 13 is provided. It is desirable that the fixing bracket 2 is inserted so that the fixing piece 221 is on the outer side and is not disposed on the inner side of the opening.

  The insertion support portion 21 has a base surface piece 211 that is in contact with the convex rib 131, and is bent upward from both sides of the base surface piece 211 in a reverse C shape so that it is slightly larger than the width of the square base material 13. It is formed to have a support piece 212 that is widened and supports the corners on both sides in the square base material 13 at the tip part. When inserted into the mold base material 13, both support pieces 212 are restored and pressed against the inner peripheral surface (both inner wall surfaces) of the square base material 13 so as to be able to oscillate and maintain a state where the retaining is restricted, and In addition, it can be detachably mounted including insertion displacement.

Furthermore, when the support piece 212 is inserted into the square base material 13, the internal dimensions of the square base material 13 (the inner dimensions ( The base piece 211 and the convex rib 131, which are substantially matched to the in-cylinder dimensions), are formed with a fitting tolerance with a slight gap (play).
That is, the insertion support portion 21 includes a space S1 formed between the base surface piece 211 that contacts the convex rib 131 and the lower inner peripheral surface including play of the convex rib 131, and the support piece 212 and the lateral side. There is a space S2 formed between the side inner peripheral surface (inner wall surface), and the rectangular base material 13 can swing by the elastic restoring force of the support piece 212 in the space S1 direction and the space S2 direction. When the ceiling or wall base is subjected to vibration such as an earthquake in the front-rear direction, the square base material 13 is swung in the front-rear direction (tilting around the horizontal cylinder core), and the stud 12 directly vibrates. It is not transmitted.
The space S1 formed between the base surface piece 211 and the lower inner peripheral surface (inner wall surface) is formed by using the convex rib 131, but a convex member may be interposed separately, Convex ribs may be provided on the base surface piece 211. When the square base material 13 having no convex ribs 131 is used, a large amount of play is required. Anything that can be secured is acceptable.

  The square base material 13 is set to have a thickness of 0.6 mm of the two fixing brackets 2 attached between the studs 12, that is, slightly shorter than the width between the fixing pieces 221. Since the end portion of the inserted rectangular base material 13 is supported by the insertion support portion 21 while absorbing the installation error, the insertion width dimension is strictly defined at this time. However, it is possible to absorb an installation error (cutting error) of the square base material 13 within a range in which it can be supported and received firmly, and it can be shifted in the horizontal direction. Note that a C-type base material may be used in place of the square base material 13, and any shape that can be supported and received by the support piece 212 may be used.

  The stud mounting portion 22 has a rising piece 222 that is bent upward from a base piece 211 between the two supporting pieces 212 in a side view and is supported between the rising piece 222 and the fixed piece 221. It is interposed between the pieces 212 (inside the cylinder) and has a bent portion 223 that is bent 90 degrees in a side view and bent. That is, the stud attachment portion 22 has a fixed piece 221 and a rising piece 222 that are brought into contact with the stud 12, and a bent portion 223 as a non-surface contact area with respect to the stud 12, and one bent piece is a width of the rising piece 222. It is set to approximately the same width.

  The bending area of the bent portion 223 is formed with a bending width (approximately 3/5 width) wider than 1/2 of the cutting edge from the upper end of the inner periphery (inner wall) of the square base material 13. It is set to about 2/5 width. In addition, although the bending part 223 was bent in the shape of a character, it is needless to say that it may be an arbitrary shape such as a curved shape. In addition, the bent portion 223 regulates the falling of the two support pieces into the inside 212 at both ends, and elastically receives and absorbs the vibration when the stud 12 is shaken due to an earthquake or the like. It has a function of preventing transmission to the square base material 13, and the support function of the insertion support portion 21 can be maintained.

  Now, the stud 12 illustrated in FIG. 4 will be described based on a state in which the stud 12 is swayed in the horizontal direction (right side). However, since the stud attachment portion 22 and the support piece 212 are formed independently, the bent portion 223 has elasticity, and the fixed piece 221 is separated from the end of the square base material 13. Thus, the vibration is absorbed and the transmission to the rising piece 222 is eased.

In the left fixing bracket 2, the screw-fixed fixing piece 221 is tilted inward by receiving the vibration stress of the stud 12, but the upper end corner of the support piece 212 is brought into contact with the stud 12 and becomes a fulcrum. The load that separates 222 (including the lower surface of the screw fixing portion of the fixing piece 221) from the surface of the stud 12 works. At this time, the bending portion 223 of the stud mounting portion 22 is elastically extended, and the support piece 212 is tilted. Further, it tilts inward and acts to absorb the vibration and relieve the load on the support piece 212. Further, since the square base material 13 is cut to be shorter than the width between the fixed pieces 221 so as to be inserted and displaced in the left and right direction, the square base material 13 is swung while being displaced when the stud 12 is vibrated. The vibration can be absorbed by the joint action with H.223, the deformation of the fixing bracket 2 is prevented, and the installation level of the square base material 13 is maintained.

  In the embodiment of the present invention configured as described above, when the ceiling or wall base is constructed, the end portion of the square base material 13 is horizontally fixed between the studs 12 via the fixing bracket 2. However, the fixing metal fitting 2 is inserted into the cutting edge of the square base material 13 to support the square base material 13 and the insertion support portion 21 that is abutted against the stud 12 and the tip side is square. The insert support portion 21 includes a base surface piece 211 and an inverted C shape upward from both sides of the base surface piece 211. While being bent up and widened wider than the inner width of the square base material 13, it is formed with support pieces 212 that support and receive both side corners in the square base material 13 at the tip. The stud mounting portion 22 is located above the base surface piece 211 between the support pieces 212. The fixing piece 2 is formed with a rising piece 222 that is bent in an L-shape and a bent portion 223 that is bent between the rising piece 222 and the fixing piece 221 and between the support pieces 212. Is inserted into the square base material 13 with both support pieces 212 sandwiched between them, and is elastically pressed against the inner peripheral surface (inner wall surface) of the square base material 13 to prevent it from coming off, and the insertion support portion 21. It is possible to support the rectangular base material 13 by allowing insertion displacement thereof, and the bent portion 223 restricts both the support pieces 212 from falling at both ends thereof, and elastically receives and absorbs the vibration of the stud 12. The support function of the insertion support portion 21 can be maintained.

  When the fixing bracket 2 is configured in this manner, a thin steel base material made of lightweight steel is used, and the end portion of the base material is placed between the studs 12 while being a ceiling or a wall base structure that is connected and fixed to the stud 12. Since the square base material 13 is adopted as the base material, and the insertion support portion 21 (both support pieces 212) of the fixing bracket 2 is elastically pressed to the inner periphery (inner wall) thereof, it can be inserted in a state where it is prevented from coming off, so that welding is possible. Even if it is not screwed, it does not fall out during the work and can be supported without rattling, and it is only necessary to screw the fixing piece 221 exposed from the square base material 13 to the stud 12, and the fixing work is easy. In addition to being able to do this, the fixing bracket 2 can be inserted and joined to the square base material 13 so that it can be supported while absorbing the installation error, and the length of the square base material is strictly abutted. Must be cut by dimensions Without, can be slightly shorter cut and will, to simplify the fixing work, it is possible to improve the workability and efficiency at the ceiling or wall base construction.

  Moreover, even after the construction, even if the stud 12 vibrates due to an earthquake or the like, the stud mounting portion 22 and the both support pieces 212 are independent, and the bent portion 223 collapses both support pieces at both ends thereof. Not only is the compression function to the inner periphery (inner wall) of the square base material impaired, but the stud vibration in the horizontal direction of the square base material is elastically received and cut short. It is possible to absorb the square base material that has been inserted while allowing an insertion shift. In addition, the vibration of the stud in the front-rear direction of the ceiling or wall base is caused between the base piece 211 and the lower inner peripheral surface (inner wall surface) and between the support piece 212 and the lateral inner peripheral surface (inner wall surface). The square base material 13 is swung with tilting in the front-rear direction (the direction around the horizontal cylinder core) by the action of the elastic restoring force of the support piece 212 in the direction of each gap (space S1 and space S2) formed in Thus, the vibration of the stud 12 can be absorbed without being directly transmitted. As a result, the stress load on the joint portion is reduced and the occurrence of rattling is prevented, the deformation of the end portion of the square base material 13 and the fixing bracket 2 (insertion support portion 21) is prevented, and the support function is maintained. Therefore, the permanent installation accuracy of the square base material 13 can be maintained, and the earthquake resistance of the entire ceiling and wall base can be improved, thereby contributing to the maintenance of the structural quality characteristics.

  In addition, the bent portion 223 is bent between the rising piece 222 and the fixed piece 221 so as to be substantially square in the side view (inner side of the cylinder) between the support pieces 212. When the insertion support portion 21 is inserted, the inclined surface inclined downward from the fixed piece 221 is inserted without being obstructed by the upper convex rib 131 formed on the rectangular base material 13. In addition to the above, it is possible to restrict the falling of the two support pieces into the inside 212 at both ends thereof.

  Further, the insertion support portion 21 is formed between the base surface piece 211 and the lower inner peripheral surface (inner wall surface) of the square base material 13, and the inner peripheral surface (inner wall surface) of the support piece 212 and the square base material 13. Are inserted so as to be swingable by the elastic force of the support piece 212, so that a smooth insertion set to the square base material 13 can be performed. When the ground is subjected to vibration such as an earthquake in the front-rear direction, the square base material 13 is swung in the front-rear direction (tilting around the horizontal cylinder core) to absorb the vibration of the stud 12 so that it is not transmitted directly. It has become.

  Further, the stud 12 is formed of the same member as the square base material 13, and the wall base of the lintel portion 10 is on the upper surface of the square base material 13 laid across between the studs 12. Further, a plurality of square base materials 13 are erected by using the fixing bracket 2, and the ceiling and wall base of the inspection port are fixed brackets in which the square base materials 13 are inserted at both ends thereof. Since the two fixed pieces 221 are arranged opposite to each other and are horizontally mounted with a predetermined interval between the studs, the studs 12 and the square base material 13 to be horizontally mounted are arranged. Further, the upright square base material 13 can be assembled flush with each other, the fixed piece 221 is not arranged on the inner peripheral side thereof, and the wall surface board can be fitted flush with the door frame or inspection port. Work to attach the frame member while biting the frame with spacer (end material) Reduce, the improved efficiency can be attached accurately Ken.

In addition, since the fixing bracket 2 is formed by bending a single plate member by pressing, there is an advantage that the manufacturing cost of the fixing bracket 2 can be reduced and an inexpensive fixing bracket 2 can be provided.

It is a fixture for a square base material, (A) is a plan view, (B) is a plan view, (C) is a side view, and (D) is a sectional view. It is a principal part front view which shows the usage example to the base | substrate structure which forms the lintel part of a fixing metal fitting. It is AA sectional drawing of FIG. 2 explaining the rocking | fluctuation space of a square-shaped base material. It is operation | movement explanatory drawing of the fixing metal fitting which shows the state in which the stud shook in the horizontal direction (right side).

10 lintels 11 runners 12 studs 13 square base materials 131 convex ribs 2 fixing brackets 21 insertion support portions 211 base pieces 212 support pieces 22 stud mounting portions 221 fixing pieces 222 rising pieces 223 bent portions S1 space (gap)
S2 space (gap)

Claims (8)

A runner disposed above and below, a plurality of studs standing at predetermined intervals in the horizontal direction with the upper and lower ends supported between the runners, and a cylindrical square that is horizontally mounted between the studs In the base structure that constitutes the ceiling and wall base such as the lintel part of the door and the inspection port with the base material and the fixing bracket that fixes the square base material to the stud,
When fixing the square base material to the stud via the fixing bracket, the fixing bracket is inserted into the cutting edge of the square base material, and an insertion-type insertion support portion that supports the square base material; And a stud mounting portion having a fixing piece that is abutted against the stud and whose tip side extends from the square base material, and
The insertion support part has a base surface piece and is bent upward from both sides of the base surface piece so as to be folded upward and widened to be wider than the square base material width. While having a corner and a support piece for supporting and receiving at the tip,
The stud mounting portion is bent in the space between the two support pieces between the rising piece and the fixed piece, and the rising piece bent upward in an L shape from the base piece between the two supporting pieces. And having a bent portion to be formed,
The square base material is inserted into the square base material with both the support pieces sandwiched between them, and the inner periphery of the square base material is elastically pressed to prevent it from coming off, and the insertion support portion is allowed to be inserted with respect to the square base material. In this state, the fixed piece is screw-fixed to the stud, the both bent portions prevent the both support pieces from falling down, and the stud vibration is elastically received and absorbed. A base structure of a square base material, wherein the support function of the insertion support part is attached so as to be maintained. Cylindrical square base material that is mounted on studs that stand up at predetermined intervals in the horizontal direction so as to form ceilings and wall bases such as door lintels and inspection openings. Fixing brackets that support both ends of the
The fixing metal fitting is inserted into a cutting edge of the square base material to support the square base material, and an insertion-type insertion support portion that is abutted against the stud and the tip side extends from the square base material. With a stud mounting part having a fixed piece to be taken out,
The insertion support part has a base surface piece and is bent upward from both sides of the base surface piece so as to be folded upward and widen wider than the square base material width. While having a corner and a support piece for supporting and receiving at the tip,
The stud mounting part is bent in the space between the two support pieces between the rising piece and the fixed piece, and the rising piece bent upward in an L shape from the base piece between the two supporting pieces. And having a bent portion to be formed,
The fixing metal fitting is inserted into the square base material by sandwiching both the support pieces so as to be elastically pressed to the inner periphery of the square base material to prevent it from coming off, and the square base of the insertion support portion It is possible to support by allowing insertion displacement with respect to the material, and the bent portion restricts both the support pieces from falling at both ends thereof, and elastically receives and absorbs the vibration of the stud, and A bracket for fixing a square base material, characterized in that the support function can be maintained.   The base structure and the fixing bracket of the square base material according to claim 1 or 2, wherein the bent portion is bent into a square shape.   4. The insertion support portion according to claim 1, wherein the insertion support portion is between the base surface piece and a lower inner peripheral surface of the square base material, and between the support piece and the inner peripheral surface of the square base material. A base structure and a fixing bracket of a square base material, which are inserted so as to be swingable by the elastic force of a support piece through a space formed therebetween.   5. The base structure and fixing bracket of a square base material according to claim 1, wherein the stud is formed of the same member as the square base material.   6. The wall base of the lintel portion according to claim 1, wherein a plurality of square base materials are further formed on the upper surface of the square base material horizontally disposed between the studs using the fixing bracket. A base structure and a fixing bracket of a square base material, characterized by being constructed upright.   In any one of Claims 1 thru | or 6, the ceiling and wall foundation | substrate of the said inspection port arrange | position the fixed piece of the said fixing metal fitting inserted in the both ends part back to the outside, and the said square-shaped base material is the said, A base structure and a fixing bracket of a square base material, wherein the base structure is configured to be horizontally installed with a predetermined interval between studs.   8. A base structure and a fixing bracket for a square base material according to claim 1, wherein the fixing bracket is formed by bending a single plate member.