JP2661302B2 - Grating floor construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a grating floor construction method used when constructing a skeleton grating floor of a structure.

[Conventional technology]

When constructing a framing floor of a structure, for example, a structure for accommodating a large boiler, first construct a skeleton of the structure by assembling steel columns, steel beams, etc., and then spread the required number of gratings. The construction method of building a grating floor was adopted. Hereinafter, this method will be described with reference to FIGS. 9 to 12.

As shown in FIG. 9, first, H
The steel columns 100 having a mold section are erected at predetermined intervals. next,
H-shaped steel girders 102 (also shown in FIG. 12) are lifted one by one by a lifting machine (not shown), and arranged between the steel columns 100 at a predetermined height, and each steel column 100 is bolted. Assemble to Then, the steel center beam 1 shown in FIG.
04, the steel beams 106 are lifted one by one by the above-described lifting machine in the order of the steel beams 106, and are assembled to the steel beams 102 by bolt joining (not shown) to construct a floor frame.

By repeating such steps using the above-described lifting machine, the steel column 100, the steel girder 102, and the steel beam 10
4. Assemble the steel beams 106 to construct the structural body 108.

In the state where the frame 108 of the structure of this example is constructed, the height dimension H (see FIG. 9) of the frame 108 of this structure is about 7 mm.
5m, width dimension W (see Fig. 9) is about 60m width, depth dimension L
(See Fig. 10) is about 100m long.

For the first time when the structural body 108 is constructed
A predetermined number of gratings 110 shown in FIG. 12 are lifted one by one by the hoisting machine, spread over each floor frame, and spot-welded or each steel frame girder 102, steel beam 104, so as not to be displaced by clips (not shown). It is assembled to the steel beam 106. As shown in FIGS. 12 (A) and (B), the grating 110 is formed in a predetermined shape by welding a plurality of flat plates 111 arranged in a grid at predetermined intervals.

FIG. 10 is a plan view showing, as an example, a state in which the required number of gratings 110 are laid on the floor frame of the third floor of the structural body 108 to form the grating floor 112.

[Problems to be solved by the invention]

However, according to the above construction method, the grating floor 11
Since the frame 108 of the structure is gradually built in a state where the building 2 is not built, the work for building the frame 108 of the structure gradually becomes an altitude work without the grating floor 112.

In addition, according to the above-described method, since each operation process must be performed in series, a long period of time is required.

Further, since each member is individually lifted sequentially using a hoist, the hoist has been occupied for a long time.

In consideration of the above facts, the present invention reduces the amount of work at a high place where a grating floor is not built on the structure body, and shortens the work period until the construction of the structure building the grating floor is completed on the structure body. The purpose is to obtain a grating floor construction method that can be performed.

[Means for Solving the Problems] The invention according to claim (1) is a grating floor construction method for constructing a grating floor on a skeleton of a structure having a plurality of pillars. After framing the girder assembled between the pillars into a substantially frame shape, arrange the middle beam and the small beam in the framework, and place a plurality of gratings so as to be bridged between these beams. A first grating block is configured, and a plurality of beams including a middle beam and a small beam are assembled to each other outside the frame of the structure, and then a plurality of gratings are placed so as to be bridged between the beams. By doing so, a second grating block adjacent to the first grating block is formed in a state after assembly, and then the first grating block is lifted so that a plurality of second grating blocks are not continuous with each other. By inserting between the columns and fixing the columns and the girders of the first grating block, a predetermined section of the grating floor is formed discontinuously, and then the section which is a discontinuous portion of the first grating block is formed. By inserting the second grating block and fixing the beam constituting the second grating block and the large beam of the first grating block,
It is characterized by building a grating floor.

[Action]

According to the invention described in claim (1), the first grating block and the second grating block are respectively formed outside the frame of the structure. In particular,
In the first grating block, after the girders assembled between the columns of the skeleton of the structure are framed so as to have a substantially frame shape, the middle beams and the small beams are arranged in the framework. A plurality of gratings are placed so as to be bridged between the beams, and are used as a first grating block. Further, in the second grating block, after assembling a plurality of beams including the middle beam and the small beam, a plurality of gratings are placed so as to be bridged between these beams, A second grating block adjacent to the first grating block in the assembled state is configured.

Next, the first grating block is lifted and inserted between the plurality of columns so as not to be continuous with each other, and the column and the large beam of the first grating block are fixed, so that a predetermined section of the grating floor is discontinuous. It is composed of Thereafter, the second grating block is inserted into a section which is a discontinuous portion of the first grating block, and the beam constituting the second grating block and the large beam of the first grating block are fixed, so that the grating is formed. The floor is built. That is, according to the present invention, in the state after assembly, the girder of the first grating block is also used as the girder of the second grating block.

According to the above construction method, since the construction work of the first grating block and the second grating block is performed outside the skeleton of the structure, the construction work of the first grating block and the second grating block is performed in the skeleton of the structure. It can be performed simultaneously with its own construction work. Furthermore, the construction work of the first grating block and the second grating block can be performed in advance before constructing the structural body itself. For this reason, the construction period for completing the construction of the grating floor on the skeleton of the structure is shortened.

In addition, according to the above-described method, when the height of the frame of the completed structure is high and the columns are sequentially increased with a plurality of joints, a grating floor is constructed every time the columns are erected for one node. It becomes possible. For this reason, the amount of work at a high place in a state where a grating floor is not constructed on the frame of the structure is reduced.

Furthermore, according to the above construction method, the first grating block having the girder is first assembled to the frame of the structure, so that the girder is installed between the columns earlier, and the strength of the structure is reduced earlier. It is possible to secure. In addition, as described above, since the second grating block has a configuration in which the girder of the first grating block is shared, it is possible to avoid overlapping of the girder as compared with a case in which both have independent girder. it can. That is, it is possible to ensure the design strength of the structure using the minimum necessary steel material.

Further, according to the above construction method, after the first grating block is firstly and discontinuously assembled, the second grating block is assembled to the discontinuous portion to construct a final grating floor. Because of the configuration, when assembling the second grating block (that is, when joining a plurality of beams including the middle beam and the small beam of the second grating block to the large beam of the first grating block). Is
The first grating block can be effectively used as a work scaffold. Therefore, the work of assembling the second grating block can be performed efficiently and safely.

〔The invention's effect〕

As described above, the grating floor construction method according to the present invention can construct a grating floor every time a column is erected, so that the amount of work at a high place in a state where the grating floor is not constructed on the skeleton of the structure is constructed. Has an excellent effect that it can be reduced.

Further, the grating floor construction method according to the present invention is the first method.
And the construction of the second grating block can be performed simultaneously with the construction of the frame itself of the structure. Further, the construction of the first and second grating blocks can be performed on the structure. Since it is also possible to carry out in advance before constructing the skeleton itself, there is an excellent effect that the construction period for completing the construction of the grating floor on the skeleton of the structure can be shortened.

Further, since the grating floor construction method according to the present invention has a configuration in which the first grating block is first assembled and then the second grating block is assembled by sharing the girder of the first grating block. In addition, the strength of the structure can be secured early, the design strength of the structure can be secured using the minimum necessary steel material, and the weight of the structure can be reduced. Has the effect.

Further, the grating floor construction method according to the present invention is the second method.
When assembling the above-mentioned grating block, the first grating block can be effectively used as a work scaffold, so that the work of assembling the second grating block can be performed efficiently and safely. Has excellent effects.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 8 is a schematic perspective view of the structural body 10. The frame 10 of the structure includes a plurality of steel columns 12 and steel beams 14 erected at predetermined intervals from a base portion (not shown).
The main part is constituted by. In this figure, the steel column 12 and the steel beam 14 on the outer peripheral portion of the frame 10 of the structure are shown.
Only shown.

In the frame 10 of this structure, a large boiler (not shown) suspended from a ceiling beam (not shown) is housed at a substantially central portion thereof.

In addition, a grating floor 16 is provided for each predetermined floor in the frame 10 of this structure. In this figure, 1
Only the grating floor 16A of the floor is indicated by a solid line, and the grating floors 16B and 16C of the second and subsequent floors are indicated by a two-dot chain line.

Hereinafter, the grating floor 16A on the first floor will be described in detail with reference to FIGS.

This grating floor 16A comprises a first grating block 18 shown in FIGS. 1 to 4 and a second grating block 20 shown in FIGS. 5 to 7.

First, the first grating block 18 will be described.

As shown in FIG. 1, a first grating block
Reference numeral 18 includes a pair of steel girders 22 arranged in parallel with each other, and a pair of steel girders 24 arranged perpendicular to the pair of steel girders 22 and parallel to each other. These steel girders 22, 24 are arranged so as to form a substantially rectangular frame shape in plan view. The longitudinal length of the steel girder 24 is
The length is set to be longer than the length of the steel beam 22 in the longitudinal direction.

As shown in FIG. 3, both the steel girders 22 and 24 are made of H-shaped steel, and the upper flanges 26 opposed to each other are formed.
A, 26B and lower flanges 28A, 28B.

Further, as shown in FIG. 1, between the longitudinal middle portions of the pair of steel girders 24, a horizontal middle girder 32 is extended in parallel with the steel girders 22, and is fixed by a bolt connection (not shown). In addition, a longitudinal center beam 30 is fixed by a bolt joint (not shown) between the horizontal center beam 32 and the intermediate portion in the longitudinal direction of the steel beam 22, and is bridged in parallel with the steel beam 24. Note that both the vertical center beam 30 and the horizontal center beam 32 are H-shaped steel.

In addition, between the steel girder 24 and the vertical middle girder 30, a steel girder 22
A plurality of small beams 34 are fixed by bolts (not shown) in parallel with each other at predetermined intervals. The small beam 34 is also an H-shaped steel, like the vertical center beam 30 and the horizontal center beam 32. In addition,
The number and position of the small beams 34 are changed as necessary according to the shape of the large boiler.

At the corners where the longitudinal ends of the steel girder 22 and the longitudinal ends of the steel girder 24 face each other, the lower flanges 28A and 28B are provided at positions where the steel girder 22 and the steel girder 24 are bridged.
A cradle 36 is disposed on the side of the cradle.

The pedestal 36 is made of a steel beam having an H-shaped cross section in the width direction, and has a length in the longitudinal direction that is about half of the length of the steel beam 22 in the longitudinal direction.

As shown in FIG. 1 to FIG.
A plurality of grating panels 38 are laid between the beams such as 2, 24, the vertical center beam 30, the horizontal center beam 32, and the small beam 34 so as to be bridged therebetween. These grating panels 38 are formed by arranging a plurality of flat plates 39 in a lattice shape and welding the joint ends thereof.
Adjacent grating panels 38 are joined by spot welding or clips (not shown).

The grating panel 38 placed at a position facing the cradle 36 has a hanging platform 40
Are placed corresponding to the receiving table 36 (see FIG. 2). The suspension base 40 has an H-shaped steel beam cross section in the width direction similarly to the receiving base 36, and has the same length in the longitudinal direction. In addition, a substantially rectangular hanging piece is provided on the surface on the side away from the grating panel 38 in the middle portion in the longitudinal direction of the hanging table 40.
42 is fixed. A circular hole 44 is formed in the suspending piece 42 at a substantially central portion thereof, and a wire 43 is connected to the suspending piece 42 when it is lifted by a hoisting machine 46 (see FIG. 4). A lifting hook 49 attached to the distal end of the wire 48 of the hoist 46 is engaged with the wire 43.

As shown in FIG. 2 and FIG. 3, coaxial circular holes (not shown) are formed in the suspension stand 40 and the receiving stand 36 at a plurality of locations, and are fastened by bolts 50 and nuts 52. There are a total of eight bolted positions sandwiching the steel beams 22 and 24 (see FIG. 2).

Next, the second grating block 20 is moved to the fifth grating block.
This will be described with reference to FIGS.

As shown in FIG. 5, the second grating block
Similarly to the first grating block 18, the beam 20 includes a plurality of beams, such as a steel beam girder 22, a vertical center beam 30, a horizontal center beam 32, and a small beam 34, and these beams are assembled together. I have. However, the steel girder 24 is a beam provided in the first grating block 18, and in order to show that the steel girder 24 is shared by the second grating block 20, FIG.
In the figure, the two-dot chain line is used. Therefore, when the second grating block 20 is configured, the steel beam girder 24 does not exist. The position of the small beam 34 is changed (see comparison with FIG. 1). In addition, the width of the horizontal middle beam 32 and the small beam 34 of the second grating block 20 in the width direction is slightly smaller than the width of the steel beam 22 in the width direction.

As shown in FIGS. 5 and 7, in the vicinity of both ends in the longitudinal direction of the steel girders 22, pedestal beams 54 are arranged on the lower flange 28A side. The pedestal / combined beam 54 is a steel beam having an H-shaped cross section in the width direction, and its longitudinal length is slightly larger than the longitudinal length of the steel beam 24 of the first grating block 18. Cradle combined beam 54
Spacers (not shown) are buried in gaps formed between the horizontal beam 32 and the small beams 34.

In addition, the upper flange 26A of the steel girders 22 and each longitudinal center beam 30,
A grating panel 38 is spread between the upper flanges of the horizontal center beam 32 and the small beam 34 in the same manner as the first grating block 18.

Grating panel 38 facing the cradle / combined beam 54
On the surface on the side separated from the cradle / combined beam 54, a suspension / combined beam 56 is placed at a position corresponding to the cradle / combined beam 54. The hanging beam 56 also has an H-shaped cross section in the same manner as the receiving beam 54, and its longitudinal length is substantially the same as the longitudinal length of the receiving beam 54.

As shown in FIGS. 5 to 7, hanging pieces 42 are fixed to the surface on the side separated from the pedestal serving beam 54 in the vicinity of both ends in the longitudinal direction of the serving base beam 56, respectively. Fifth
As shown in the figure, these hanging pieces 42 are positioned such that the direction orthogonal to the thickness direction is substantially the same as the diagonal direction of the second grating block 20.

As shown in FIG. 7, a plurality of coaxial circular holes (not shown) are formed in the suspension stand beam 56 and the cradle stand beam 54 at a plurality of locations, and fastened by bolts 50 and nuts 52. There are a total of eight bolted positions so as to sandwich the upper and lower flanges 26A and 28A of the steel girders 22 in the width direction, respectively (see FIGS. 5 to 7).

The first grating block 18 thus configured
And the second grating blocks 20 are alternately arranged to form the grating floor 16A of the first floor portion.

The grating floors 16B and 16C on the second and subsequent floors are constructed in the same configuration as the grating floor 16A on the first floor.

In the following, this embodiment is applied to the grating floor of the structural body 10.
16 will be explained through the construction procedure when constructing.

Here, the construction procedure is divided into an operation of constructing the structure body 10 itself and an operation of assembling the first and second grating blocks 18 and 20 outside the structure body 10.

Therefore, the operation of assembling the first and second grating blocks 18 and 20 will be described first.

In order to assemble the first grating block 18, first, the pedestals 36 are respectively arranged at positions that become corners when the steel girder 22 and the steel girder 24 are arranged in a frame shape.
Next, the steel girder 22 and the steel girder are attached to the upper flange of the cradle 36.
Place 24 in a frame. In addition, this steel girder
22, the vertical middle beam 30, the horizontal middle beam 32, and the small beam 34 are sequentially assembled to the steel beam 24 by bolting or the like. Thereafter, the required number of grating panels 38 are placed between the upper flanges of the steel girders 22, the steel girders 24, the vertical center beams 30, the horizontal center beams 32, and the small beams 34. At this time, the adjacent grating panels 38 are joined by spot welding or clips (not shown).

Next, the hanging table 40 is attached to the surface of the grating panel 38 facing the receiving table 36 on the side away from the receiving table 36.
Place it at the position corresponding to 36.

Finally, the suspension base 40 and the receiving base 36 are bolted and nuts
By fastening at 52, the first grating block
18 is completed. This first grating block 18 is placed on the ground floor 16 of each floor in the factory or on the ground at the construction site.
A, 16B, and 16C are manufactured in parallel with the construction work of the structure itself, which will be described later, in the number required for building.

Next, a procedure for assembling the second grating block 20 will be described.

As for the second grating block 20, the first grating
The assembling work is performed in substantially the same manner as the grating block 18. However, the beam 54 also serves as the cradle and the beam 56
Unlike the first grating block 18, the position where is disposed is near the both ends in the longitudinal direction of the steel girders 22. Further, in the second grating block 20, a spacer (not shown) is embedded between the horizontal center beam 32, the small beam 34, and the pedestal beam 54.

Similarly to the first grating block 18, the second grating block 20 has the same structure as the first grating block 18, for example, the number of sheets required for constructing the grating floors 16A, 16B, and 16C of each floor in the factory. Manufacture in parallel.

Next, an operation of constructing the structural body 10 itself will be described.

In order to construct the skeleton 10 of this structure, first, a basic portion (not shown) is constructed. Next, a plurality of steel columns 12 are erected at predetermined intervals. Further, a steel beam 14 is erected between the steel columns 12.

When the steel columns 12 on the first floor are erected, the suspension pieces 42 of the first grating block 18 are respectively connected with wires.
Connect 43. A hook 49 for lifting the wire 48 of the lifting machine 46 is locked to the wire 43. Thereafter, the first grating block 18 is lifted by operating the lifting machine 46 as shown in FIG. 4 and inserted every other between the steel columns 12 to fix the steel beams 22 and 24 to the steel columns 12. I do. After the fixing operation is completed, the receiving base 36 and the suspension base 40 are removed from the first grating block 18. As a result, a plurality of sections of the grating floor are built in the structural body 10 every other one.

Next, according to the same procedure, the second grating block 20 is inserted alternately with the first grating block 18 to fix the steel girder 22 to the steel column 12 and to construct the first grating already completed. The small beam 34 is fixed to the steel beam 24 of the block 18 by bolting. After the fixing operation is completed, the gantry 54 and the hanging beam 56 are removed from the second grating block 20. As a result, the second grating blocks 20 are inserted between the sections of the first grating blocks 18 constructed every other, and the grating floor 16A is constructed on the first floor portion of the structural body 10. Is done.

In this way, by providing two types of grating blocks, that is, the first grating block 18 and the second grating block 20 and arranging them alternately, the second grating block 20 is shared with the steel beam 24 of the first grating block 18. Can be assembled.

By repeating the above operations, the structure 10
The second and third floor grating floors 16B and 16C are constructed.

Here, for example, when working at the position of the grating floor 16C on the third floor shown in FIG. 8, the worker may use the grating floor 16C as a scaffold, so that the worker has no floor as in the prior art. In this state, it is not necessary to work using only the steel beam as a scaffold. Therefore, the worker does not need to perform work at high places without a floor.

Further, according to the above construction method, the on-site work for constructing the structural body 10 itself and the first and second grating blocks are performed.
The work of assembling 18, 20 can be performed separately and simultaneously. Accordingly, it is possible to significantly reduce the construction period required for constructing the skeleton 10 of the structure and constructing the grating floor 16 on the skeleton 10 of the structure as compared with the related art.

The operation of assembling the first and second grating blocks 18 and 20 may not be performed simultaneously with the operation of constructing the frame 10 of the structure, but may be performed in a factory in advance.

Furthermore, according to the above-mentioned construction method, the first grating block 18 having the steel girders 22, 24 precedes the frame of the structure.
Since the steel beams 22 and 24 are installed between the steel columns 12, it is possible to secure the strength of the structure at an early stage. In addition, as described above, the second grating block 20 includes the first grating block 18.
Since the steel girders 24 are commonly used, it is possible to avoid the overlap of the steel girders as compared with the case where the two are separately provided with the steel girders. That is, it is possible to ensure the design strength of the structure using the minimum necessary steel material.

Further, according to the above-described method, after the first grating block 18 is firstly and discontinuously assembled, the second grating block 20 is assembled to the discontinuous portion and the final grating floor 16 is formed. Because it is a configuration that is built,
When assembling the second grating block 20, the first grating block 18 can be effectively used as a working scaffold. For this reason, the work of assembling the second grating block 20 can be performed efficiently and safely.

Further, the first and second grating blocks 1
8 and 20 can be manufactured and assembled in a factory, so that the quality control of the product is easy and the quality can be improved.

In this embodiment, as shown in FIGS. 2 and 6, bolt holes (not shown) for connecting the receiving base 36 and the hanging base 40, the receiving base beam 54, and the hanging base beam 56 are formed. Although the holes are actually drilled only at locations where the bolts 50 actually penetrate, a spare hole may be drilled in advance at a position offset from the hole (not shown). This allows the bolt 50
Does not interfere with the flat plate 39 of the grating panel 38.

In the present embodiment, the substantially rectangular hanging piece 42 is formed on the hanging stand 36 and the hanging / combined beam 56, but the shape of the hanging piece 42 is not limited to the substantially rectangular shape and is used for lifting the lifting machine 46. Any shape can be applied as long as the hook 49 is locked.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first grating block according to the present embodiment, FIG. 2 is an enlarged plan view of a main portion showing the vicinity of a suspension stand in FIG. 1, and FIG. 3 is a view showing a state shown in FIG. FIG. 4 is an explanatory view showing an operation of inserting the first grating block into a steel column on the first floor, FIG. 5 is a plan view showing a second grating block according to this embodiment, and FIG. 5 is an enlarged plan view of a main part showing the vicinity of a suspension stand / beam in FIG. 5, FIG. 7 is a side view of the state shown in FIG. 6, and FIG. 8 is a state in which a grating floor is constructed on the frame of the structure. 9 to 12 are views according to the related art, FIG. 9 is a side view of a frame of the structure, FIG. 10 is a plan view showing an arrangement of a grating floor, and FIG. FIG. 12 is a plan view showing details of the grating floor, and FIG. 12 is an explanatory diagram of the grating. 10 …………………………………………………………………………………………………………………………………………………………… ……………………………………. ), 30 ... vertical beam, 32 ... horizontal beam, 34 ... beam, 38 ... grating panel.

Claims (1)

(57) [Claims] 1. A grating floor construction method for constructing a grating floor of a structure having a plurality of columns, wherein a girder to be assembled between the columns is substantially frame-shaped outside the structure of the structure. After arranging the frame, a middle beam and a small beam are arranged in the framework, and a plurality of gratings are placed so as to be bridged between the beams to form a first grating block. Outside, a plurality of beams including a middle beam and a small beam are assembled to each other, and then a plurality of gratings are placed so as to be bridged between these beams. Second adjacent to the block
Then, the first grating block is lifted and inserted between the plurality of columns so as not to be continuous with each other, and the first grating block and the first
By fixing the girder of the grating block to a predetermined section of the grating floor, the second grating block is inserted into a section serving as a discontinuous portion of the first grating block. A grating floor construction method, wherein a grating floor is constructed by fixing a beam constituting the grating block and a large beam of the first grating block.