JP6782095B2 - How to build a steel frame of a building - Google Patents

Description

The present invention relates to a method for constructing a steel frame member of a building.

Conventionally, in a steel-framed building, a steel frame may be constructed for each node with a plurality of layers of the building as one node (hereinafter referred to as a node stacking method). In this case, the steel frame is constructed for one section, and the steel frame members are temporarily fixed with temporary bolts. Next, the installation and distortion of the built-in steel frame are adjusted, and then the temporary bolt is replaced with the main bolt, and the main bolt is fully tightened to finally fix the steel frame member.

In the knot stacking method, in order to perform operations such as removing temporary bolts and attaching main bolts, a method of covering the work space where the steel frame is constructed with a protective wall such as a curing frame or an external scaffold has been proposed (Patent Document 1, 2).
For example, Patent Document 1 discloses an outer wall curing net device including a framed curing net, a mounting arm, and a support arm. In this outer wall curing net device, the mounting arm and the support arm are attached to the upper and lower steel frames of the work space, so that the work floor is surrounded by the framed curing net.
Further, Patent Document 2 discloses a curing device provided with a curing frame and a curing net. By supporting the upper and lower ends of this curing device from the pillar frame, the work floor is surrounded by a curing net.

Japanese Unexamined Patent Publication No. 6-193272 Japanese Unexamined Patent Publication No. 2001-140474

In the knot stacking method, the steel frame members in the construction span multiple layers, so it is necessary to raise the protective wall. However, if the protective wall is raised, the effect of wind pressure will increase, so the protective wall will be enlarged to increase rigidity. It was necessary to secure it, and as a result, the cost was high.

An object of the present invention is to provide a steel frame construction method capable of reliably curing a steel frame construction work at low cost when the steel frame construction method is performed by a knot laminating method.

The present inventors integrate two or three layers into one section, and after installing a girder in the entire section in advance, when the girder on the floor directly above the predetermined floor and the girder on the floor are finally tightened. In addition, by providing a protective wall only on the outer peripheral side surface of the work space, we focused on being able to reliably catch flying objects during construction work while limiting the curing range, and the steel frame construction method of the building of the present invention. I came up with the method.
The feature of the present invention is that it is not necessary to install a protective wall from the ground surface to the top floor, and the protective wall may be installed only on the floor where the final tightening work or welding work of the steel frame structural material is performed. In addition to being able to be constructed in a short time, even if a protective wall is constructed using a relatively lightweight curing frame, it is possible to catch flying and falling objects during work.

The method for constructing a steel frame of a building according to the first invention is a method for constructing a steel frame of a building for constructing a steel frame member, wherein a plurality of layers (for example, three layers) of the building are regarded as one section and a predetermined section is formed. A step of constructing a steel frame member of a pillar (for example, a pillar 10 described later) and a girder (for example, a girder 11 described later) in advance and temporarily fixing the built-in steel frame member (for example, step S1 described later). The lowermost layer (for example, the nth floor described later) of the predetermined section is used as a work space (for example, the work space S described later), and a protective wall (for example, the protective wall 20 described later) is provided on the outer peripheral side surface of the work space. A step of arranging, attaching the remaining steel member (for example, a beam described later) of the work space, and finally fixing the steel member together with the previously built steel member (for example, step S2 described later) and the work space. The layer directly above the new work space is used as a new work space, the protective wall is moved one step upward, the protective wall is placed on the outer peripheral side surface of the new work space, and the remaining steel members of the new work space are attached. It is characterized by comprising a step of repeating the work of main fixing together with the steel frame member built in advance from the lower layer to the upper layer (for example, steps S3 to S5 described later).

According to the present invention, a plurality of layers such as two or three layers of a building are used as one node to construct a steel frame member of a column and a girder of a predetermined node (knot stacking), and the steel frame member is temporarily bolted or the like. Fix it.
Next, the bottom layer of this predetermined node is used as a work space, a protective wall is arranged on the outer peripheral side surface of this work space, the remaining steel members of the work space are attached, and bolts are attached together with the steel members built in advance. It is finally fixed by final tightening or welding.
Next, the protective wall is moved up by one layer, the layer directly above the bottom layer is used as the work space, the remaining steel members of this work space are attached, and the bolt book is attached together with the previously built steel members. This is finally fixed by tightening or welding. The work of finally fixing the steel frame in this way is repeated from the lower layer to the upper layer.

Therefore, since the protective wall is arranged only on the side surface of the work space where the main fixing of the steel frame member is performed, it is not necessary to raise the protective wall, and the protective wall can be made into a simple structure, so that the steel frame construction work can be cured at low cost. it can.
In addition, when the steel member of the work space is permanently fixed, the work space is covered with a protective wall, which ensures work safety and prevents tools and construction materials from falling. it can.

In the method for constructing a steel frame of a building according to the second invention, the protective wall is provided on a wall portion (for example, a wall portion 22 described later) and a floor-level steel frame member (for example, the work space) provided on the wall portion. It is engaged with a first locking portion (for example, a first main bracket 23 described later) that is locked to a girder 11) described later, and a floor-level steel frame member provided on the wall portion and directly below the work space. A second locking portion (for example, a second main bracket 24 described later) to be stopped is provided, and the first locking portion and the second locking portion are each rotatably provided with the vertical direction as a rotation axis. It is characterized by being able to be.

According to the present invention, since the protective wall is locked to the steel frame member at two places above and below, the protective wall can be reliably supported. Further, since the locking portion has a rotatable structure, when the protective wall is moved upward, the locking portion is closed and stored, so that the protective wall can be smoothly moved.

The method for constructing a steel frame of a building according to the third invention is vertical between the upper end of the protective wall and a layer above the work space, and between the lower end of the protective wall and a layer below the work space. It is characterized in that a curing net (for example, a vertical curing net 38 described later) is provided.

According to the present invention, by attaching a vertical curing net to the upper and lower ends of the protective wall and covering the outer peripheral surface of the building under construction with the protective wall and the vertical curing net, it is possible to more reliably prevent the tools and construction materials from falling.

According to the present invention, since the protective wall is arranged only on the side surface of the work space for main fixing of the steel frame member, it is not necessary to install a high protective wall, and the protective wall can be made into a simple structure. Can be cured at low cost.

It is a front view of the protective wall used in the steel frame construction method which concerns on one Embodiment of this invention. FIG. 1 is a sectional view taken along the line AA and a sectional view taken along the line BB. It is a top view of the protective wall which concerns on embodiment. It is a top view of the joint part between the wall units of the protective wall which concerns on embodiment. It is a side view and the plan view of the 1st locking part of the protective wall which concerns on embodiment. It is a side view and the plan view of the 2nd locking part of the protective wall which concerns on embodiment. It is a side view and the plan view of the guide post of the protective wall which concerns on embodiment. It is a flowchart of the steel frame construction procedure by the steel frame construction method which concerns on embodiment. It is explanatory drawing of the steel frame construction procedure which concerns on embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of the protective wall 20 used in the steel frame construction method according to the embodiment of the present invention. FIG. 2A is a sectional view taken along the line AA of FIG. 1, and FIG. 2B is a sectional view taken along the line BB of FIG. FIG. 3 is a plan view of the protective wall 20.
In the steel frame construction method of the present invention, the steel frame construction of the above-ground portion 2 of the building 1 is performed using the protective wall 20. Specifically, instead of covering the entire outer peripheral surface of the steel frame member built in node units with a protective wall, only the outer peripheral surface of the floor of the work space is covered with the protective wall 20, and the steel frame construction member is finally tightened. Along with the work such as main fixing, the protective wall 20 is moved to the upper floor.
The above-ground portion 2 includes columns 10, girders 11, and small beams (not shown) as steel frame members.

The protective wall 20 is provided on the outer peripheral side surface of the n (n is a natural number of 2 or more) floors of the building 1 over the entire circumference, and a plurality of rectangular plate-shaped wall units 21 are arranged side by side in the horizontal direction. Each wall unit 21 serves as a plate-shaped wall portion 22 and a first locking portion that is provided on the wall portion 22 and is locked to a floor-level girder 11 on the nth floor, which is a work space S of the building 1. As a pair of first main brackets 23 and a second locking portion that is provided on the wall portion 22 and is locked to a floor-level girder 11 on the (n-1) floor that is directly below the work space S of the building 1. A pair of second main brackets 24 and a pair of guide posts 25 provided on the wall portion 22 and extending in the vertical direction are provided.

The wall portion 22 is a core material 30 which is a pair of H-shaped steels extending substantially parallel to the vertical direction, and a plurality of lightweight groove shapes provided in the pair of core materials 30 at predetermined intervals in the vertical direction and extending in the horizontal direction. A horizontal member 31 made of steel, a vertical member 32 which is a single pipe pipe provided in the horizontal member 31 at predetermined intervals in the horizontal direction and extending in the vertical direction, and a mesh attached to the horizontal member 31 and the vertical member 32. A sheet 33 is provided.

The pair of core members 30 are connected to each other by connecting members 34 which are a plurality of channel steels extending in the horizontal direction, and a brace 35 is provided between the pair of core members 30.
Further, at the lower end of the wall portion 22, a fall prevention plate 36 that can be opened and closed and a chain 37 that suspends and supports the fall prevention plate 36 are provided.
Further, a vertical curing net 38 is provided between the upper end of the protective wall 20 and the upper floor of the nth floor, and between the lower end of the protective wall 20 and the lower floor of the nth floor.

FIG. 4 is a plan view of the joint portion between the wall units 21.
Rubber plates 39 extending in the vertical direction are provided at both ends of the horizontal member 31 of the wall unit 21 in the horizontal direction, and the rubber plates 39 of the wall units 21 adjacent to each other are arranged so as to overlap each other.

FIG. 5A is a side view of the first main bracket 23, and FIG. 5B is a plan view of the first main bracket 23.
The first main bracket 23 transmits the vertical force and the horizontal force of the wall unit 21 to the girder 11 which is the structure of the building 1. The first main bracket 23 includes upper and lower two-stage mounting portions 40 attached to the core material 30 of the wall portion 22, and a locking portion 41 rotatably supported by these mounting portions 40.

The locking portion 41 has a substantially triangular frame shape when viewed from the side, and has a horizontal member 42 extending in the horizontal direction, a vertical member 43 extending upward from the base end side of the horizontal member 42, and an upper end and a horizontal member of the vertical member 43. A diagonal member 44 for connecting the tip of the 42 is provided.
Through holes 45 are formed in the tip portion and the intermediate portion of the horizontal member 42, respectively.
The locking portion 41 is connected to the lower mounting portion 40 on the base end side of the horizontal member 42, and is connected to the upper mounting portion 40 on the upper end side of the vertical member 43.

The mounting portion 40 and the locking portion 41 are connected by a bolt 46 extending in the vertical direction, and as shown in FIG. 3, the locking portion 41 uses the bolt 46 as a rotation axis with respect to the mounting portion 40. Rotate.
Further, through holes are provided in the overlapping portions of the mounting portion 40 and the locking portion 41, and the posture of the locking portion 41 with respect to the mounting portion 40 is fixed by inserting the rotation stop pin 48 into these through holes. You can do it.

A main bracket receiver 50 is provided on the girder 11 which is a structure of the building 1.
The main bracket receiving 50 includes a bracket receiving main body 51 extending upward from the girder 11, and a pair of plate-shaped holding portions 52 provided substantially parallel to each other on the upper portion of the main body 51 and sandwiching the horizontal member 42 of the first main bracket 23. And.

The first main bracket 23 is fixed to the main bracket receiver 50 by attaching the bolts 54 through the pair of holding portions 52 through the through holes 45 of the first main bracket 23.
At this time, the distance dimension of the wall unit 21 from the building 1 can be adjusted by appropriately selecting from the plurality of through holes 45 of the first main bracket 23.

FIG. 6 is a side view and a plan view of the second main bracket 24.
The second main bracket 24 transmits only the horizontal force of the wall unit 21 to the girder 11 which is the structure of the building 1. The second main bracket 24 includes a single mounting portion 40 mounted on the core member 30 of the wall portion 22, and a locking portion 41 rotatably supported by the mounting portion 40.
The locking portion 41 of the second main bracket 24 is different from the locking portion 41 of the first main bracket 23 in that it is composed of only the horizontal member 42.

7 (a) is a side view of the guide post 25, and FIG. 7 (b) is a plan view of the guide post 25.
The guide post 25 includes a cylindrical vertical member 60 provided on the horizontal member 31 of the wall portion 22 and extending in the vertical direction, and a cylindrical vertical member 61 arranged on the building 1 side of the vertical member and extending in the vertical direction. , A plate-shaped connecting member 62 for connecting the vertical members 60 and 61 to each other.

The girder 11 which is the structure of the building 1 is provided with extension portions 13 extending outward at predetermined intervals, and the guide post 25 is slid vertically on the extension portions 13. A guide 70 for holding the guide 70 is provided.
The guide 70 includes a guide bracket receiver 71 extending upward from the extension portion 13, and a guide bracket 72 attached to the upper portion of the guide bracket receiver 71 and extending horizontally toward the outside to hold the guide post 25 slidably. And.

The guide bracket 72 includes a bracket body 73 extending in the horizontal direction, and a substantially tubular holding portion 74 provided at the tip of the bracket body 73 and surrounding the vertical member 61 of the guide post 25.
A plurality of through holes 75 are formed in the bracket main body 73.

The guide bracket receiving 71 includes a bracket receiving main body 76 extending upward from the extending portion 13, a pair of plate-shaped holding portions 77 provided substantially parallel to each other on the upper portion of the bracket receiving main body 76 and sandwiching the guide bracket 72. To be equipped.

The guide bracket 72 is fixed to the guide bracket receiver 71 by attaching the bolt 79 through the pair of holding portions 77 through the through hole 75 of the guide bracket 72. At this time, the distance dimension of the wall unit 21 from the building 1 can be adjusted by appropriately selecting from the plurality of through holes 75 of the guide bracket 72.

Hereinafter, a procedure for constructing the above-ground portion 2 of the building 1 by the steel frame construction method of the present invention will be described with reference to the flowchart of FIG.

In the steel frame construction method of the present invention, the steel frame construction is performed with the three layers of the building 1 as one section.
This time, it is assumed that the steel frame construction of the p (p is a natural number) section is performed, and as an initial state, the steel frame construction up to the (p-1) section is completed.
In step S1, as shown in FIG. 9A, the columns 10 and girders 11 of the p-section are constructed, and the built-in columns 10 and girders 11 are temporarily fixed with temporary bolts.
In step S2, as shown in FIG. 9A, the nth floor, which is the lowest layer of the p-section, is set as the work space S, and the protective wall 20 is arranged on the nth floor. Next, on the nth floor, the remaining steel members such as girders are attached, and the temporary bolts are replaced with the main bolts and finally tightened together with the columns 10 and girders 11 built in advance. To do.

In step S3, as shown in FIG. 9B, the (n + 1) floor, which is the floor directly above the nth floor, is set as a new work space S, and the protective wall 20 is moved further upward by this (n + 1) floor. A protective wall 20 is placed on the floor. Next, on this (n + 1) floor, the remaining steel frame members such as girders are attached and fixed together with the girders 11 built in advance.

Here, the procedure for moving the protective wall 20 one layer upward is as follows.
That is, the wall units 21 constituting the protective wall 20 are lifted one by one by a tower crane (not shown).
First, the wall unit 21 is suspended and supported by a tower crane.
Next, the bolt 54 is removed to release the fixing of the main brackets 23 and 24 to the main bracket receiver 50. In addition, the fall prevention plate 36 is folded and the vertical curing net 38 is removed. Further, the guide bracket 72 is attached to the guide bracket receiver 71 of the girder 11 on the upper floor.

Next, the wall unit 21 is slightly lifted by the tower crane to release the holding of the main brackets 23 and 24 by the holding portion 52 of the main bracket receiving 50. In this state, the rotation stop pin 48 that fixed the posture of the main brackets 23 and 24 is removed, and the main brackets 23 and 24 are rotated and folded.

Next, the wall unit 21 is lifted by a tower crane. At this time, since the guide post 25 slides along the guide bracket 72, the distance dimension from the wall unit 21 to the building 1 is maintained.

Next, the main brackets 23 and 24 are rotated and opened, and the rotation stop pin 48 is attached to fix the postures of the main brackets 23 and 24.
Next, the wall unit 21 is suspended by a tower crane, and the main brackets 23 and 24 are sandwiched by the sandwiching portion 52 of the main bracket receiver 50.
Next, bolts 54 are attached to fix the main brackets 23 and 24 to the main bracket receiver 50. In addition, the fall prevention plate 36 is opened and the vertical curing net 38 is attached.

In step S4, as shown in FIG. 9C, the (n + 2) floor, which is the floor directly above the (n + 1) floor, is set as a new work space S, and the protective wall 20 is moved further upward by this (n + 2). ) Place a protective wall 20 on the floor. Next, on this (n + 2) floor, the remaining steel frame members such as girders are attached and fixed together with the columns 10 and girders 11 built in advance.
This completes the construction of the p-section steel frame.

In step S5, the above steps S1 to S4 are repeated from the lower layer to the upper layer.

According to this embodiment, there are the following effects.
(1) Since the protective wall 20 is arranged on the outer peripheral side surface of the work space S for main fixing of the steel frame member, it is not necessary to raise the protective wall, and the protective wall 20 can have a simple structure. Therefore, the steel frame construction work can be cured at low cost.
Further, when the steel frame members such as the columns 10, the girders 11, and the girders are actually fixed in the work space S, the work space S is covered with the protective wall 20, so that the safety of the work can be ensured and the protection is provided. The wall 20 can prevent tools and construction materials from falling.
Further, since the final tightening work and the welding work of the steel frame member can be performed within the curing frame by the protective wall 20, the safety of the steel frame work of the building 1 which is a steel frame system building can be ensured.

(2) Since the protective wall 20 is locked to the girder 11 at two places above and below by the main brackets 23 and 24, the protective wall 20 can be reliably supported. Further, since the main brackets 23 and 24 of the protective wall 20 have a rotatable structure, the main brackets 23 and 24 can be closed and stored when the protective wall 20 is moved upward, so that the protective wall 20 can be smoothly stored. Movement can be realized.
Further, by connecting the protective wall 20 with the girder 11 or the floor slab which is a steel frame member at different height positions of the building 1, the protective wall 20 is deformed by the seismic load while increasing the degree of fixation of the protective wall 20. Even when the above occurs, excellent deformation followability can be ensured by the rotation function of the main brackets 23 and 24.

(3) The total height of the building 1 to be constructed by attaching a vertical curing net 38 to the upper and lower ends of the protective wall 20 and covering the outer peripheral surface of the building 1 under construction with the protective wall 20 and the vertical curing net 38. It is possible to more reliably prevent the fall of tools and construction materials without providing a protective wall.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the range in which the object of the present invention can be achieved are included in the present invention.
Further, in the above-described embodiment, the protective wall 20 is provided over the entire circumference of the outer peripheral side surface of the work space S, but the present invention is not limited to this, and depending on the building, the protective wall is provided only on a part of the outer peripheral side surface of the work space. It may be provided. According to such a configuration, the degree of freedom in the steel frame construction work is increased, so that it is possible to provide a steel frame construction method according to the shape of the building.

1 ... Building 2 ... Above ground 10 ... Pillar 11 ... Girder 13 ... Extension 20 ... Protective wall 21 ... Wall unit 22 ... Wall 23 ... 1st main bracket (1st locking part) 24 ... 2nd main bracket ( 2nd locking part) 25 ... Guide post 30 ... Core material 31 ... Horizontal member 32 ... Vertical member 33 ... Mesh sheet 34 ... Connecting member 35 ... Brace 36 ... Fall prevention plate 37 ... Chain 38 ... Vertical curing net 39 ... Rubber plate 40 ... Mounting part 41 ... Locking part 42 ... Horizontal member 43 ... Vertical member 44 ... Diagonal member 45 ... Through hole 46 ... Bolt 48 ... Pin 50 ... Main bracket receiver 51 ... Main body 52 ... Holding part 54 ... Bolt 60 ... Vertical member 61 ... Vertical member 62 ... Connecting member 70 ... Guide 71 ... Guide bracket holder 72 ... Guide bracket 73 ... Bracket body 74 ... Holding part 75 ... Through hole 76 ... Bracket receiving body 77 ... Holding part 79 ... Bolt

Claims (2)

It is a method of building a steel frame of a building that builds a steel frame member.
A step of constructing a steel frame member of a column and a girder of a predetermined section in advance with a plurality of layers of the building as one section, and temporarily fixing the built-in steel frame member.
The bottom layer of the predetermined node is used as a work space, a protective wall is arranged on the outer peripheral side surface of the work space, the remaining steel frame members of the work space are attached, and the steel frame members built in advance are fixed together. Process and
The layer directly above the work space is used as a new work space, the protective wall is moved one layer upward, and the protective wall is placed on the outer peripheral side surface of the new work space, and the remaining steel members of the new work space are arranged. It is provided with a step of repeating the work of attaching and fixing together with the steel frame member built in advance from the lower layer to the upper layer .
The protective wall includes a wall portion, a first locking portion provided on the wall portion and locked to a floor-level steel member of the work space, and a first locking portion provided on the wall portion and directly below the work space. A second locking portion, which is locked to the floor-level steel member of the layer,
A method for constructing a steel frame of a building , wherein each of the first locking portion and the second locking portion is rotatably provided with a vertical direction as a rotation axis . Between the upper than the upper end and the working space of the protective wall, and, according to claim 1 wherein between the lower than the lower end and the working space of the protective wall, characterized in that the nutrient raw net is provided How to build a steel frame of a building described in.

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