JP2015200156A - Floor pit structure and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor pit structure in which PC floor slabs can be easily removed according to a change in a production line, a floor pit layout can be changed easily at low cost by changing a direction of beam members that support the PC floor slabs, and damage of the PC floor slabs can be prevented by supporting the PC floor slabs at two sides.SOLUTION: A floor pit structure includes: pillar members 2 stood on a pit base and arranged in longitudinal and horizontal directions with constant intervals; beam members 3 each joined to an upper end surface 2a of the pillar member 2 and arranged in such a manner that the extending direction aligns with the longitudinal direction Y; and PC floor slabs 4 installed by mounting support ends 4a of opposing two sides thereof across the beam members 3 neighboring in the arranging direction. The beam member 3 has a plate 5 having a cross shape in plane view provided in a protruding manner, for regulating a horizontal movement of the PC floor slabs 4, and the PC floor slab 4 has, on the lower surface, notched parts 41 which are gently fitted to the plates 5. Further, a grout material 7 is filled in a gap between the notched part 41 and the plate 5.

Description

  The present invention relates to a floor pit structure provided in a space of a predetermined area, for example, in a factory or the like, and a construction method thereof.

Conventionally, as a floor pit structure provided in a production facility such as a factory, for example, a plurality of pillar materials are erected on a pit bottom in an underground portion as described in Patent Document 1, and a girder material and a PC floor slab are formed by these pillar materials. Or the structure which supports a rail etc. from the downward direction is known.
As a structure for supporting the PC floor slab with pillars or girders in this way, a structure that supports the four corners of the PC floor slab is common, and the load received by the PC floor slab is balanced by the support portions at the four corners. It has a structure to bear.

JP 2004-316100 A

However, the conventional floor pit structure as described above has the following problems.
That is, in the floor pit of a production facility or the like, the production line may be greatly changed when changing the parts to be produced. In such a case, a large-scale layout change work such as rebuilding the entire facility or changing the range including the floor around the floor pit to match the production line will increase the construction cost. Moreover, there was a problem that the construction period was long.

  Further, in the case of a four-point support structure that supports the four corners of the PC floor slab, the load is applied to the PC floor slab at a partial point. There is room for improvement in that respect.

The present invention has been made in view of the above-mentioned problems. For example, along with a change in the production line, the PC floor slab can be easily removed, and the direction of the girder supporting the PC floor slab is changed. It is an object of the present invention to provide a floor pit structure and a method for constructing the floor pit structure that can easily and inexpensively change the floor pit layout.
Another object of the present invention is to provide a floor pit structure capable of preventing the PC floor slab from being damaged by using the PC floor slab as a two-side support, and a method for constructing the same.

  In order to achieve the above object, a floor pit structure according to the present invention is a floor pit structure provided in a space of a predetermined width, and is erected on a pit bottom board and arranged at regular intervals in the vertical and horizontal directions. A column member, and a girder joined to the upper end surface of the column member and arranged in one of the vertical and horizontal directions so as to extend in the extending direction, and two opposite sides are adjacent to each other in the arrangement direction. A precast concrete floor slab installed by being placed on the girders, wherein the girders are provided with positioning members for restricting horizontal movement of the precast concrete slab. .

  The floor pit structure construction method according to the present invention is the floor pit structure construction method described above, wherein the beam member is fixed to an upper end surface of the column member, and the beam member is arranged in any of the vertical and horizontal directions. The step of arranging the longitudinal direction in one direction, the step of providing the positioning member on the girder and restricting the movement of the precast concrete floor slab in the horizontal direction, and the opposing two of the precast concrete floor slab And a step of installing each side by placing the side on the girder adjacent in the arrangement direction.

In the present invention, since the horizontal movement of the precast concrete floor slab is restricted by the positioning member with respect to the girders, and the precast concrete floor slab is placed in a state of being positioned at a desired position, the precast concrete floor slab is replaced with the girder. Can be easily attached to or removed from the material. Therefore, it is possible to efficiently perform construction such as changing the specifications of the girders and changing to a precast concrete slab with a different weight.
And since the column members are arranged at regular intervals in each of the vertical and horizontal directions, the arrangement direction of the beam members can be changed in the horizontal and vertical directions only by removing the beam members from the column members. It becomes possible to change to either direction. Therefore, for example, there is an advantage that it is not necessary to perform large-scale construction such as changing the entire floor pit as in the past even when changing the arrangement direction of the girders in the floor pit due to a change in the production line of the factory. .

  Moreover, it becomes a 2 side support structure which supports the 2 sides of a precast concrete floor slab with a girder material, is supported by a line instead of a point, and the horizontal movement of each precast concrete floor slab is regulated by a positioning member provided on the girder material. Therefore, the horizontal load of the precast concrete slab at the time of the earthquake can be transmitted to the beam member through the positioning member, and the occurrence of relative displacement in the horizontal direction with respect to the beam member can be prevented.

  Further, in the floor pit structure according to the present invention, the positioning member is a convex portion protruding from the upper surface of the beam member, and the lower surface of the precast concrete floor slab is gently fitted to the convex portion. It is preferable that a concave portion to be combined is provided, and a solidification material is filled in a gap between the concave portion and the convex portion in a state where the concave portion is fitted to the convex portion.

  In the present invention, the concave portion of the precast concrete floor slab can be fitted to the convex portion fixed to the girder in a state having a moderate gap, and within the range of the gap formed between the concave portion and the convex portion. It is possible to align the precast concrete slab by moving it. Therefore, it is possible to improve the mounting accuracy of the precast concrete slab. And after positioning, since the said clearance gap is filled with the solidification material, a girder and a precast concrete slab can be fixed via a convex part.

  Further, in the floor pit structure according to the present invention, the convex portion is provided in a portion located on the pillar member of the beam member, and the convex portion is a plan view in which the vertical member and the cross member are crossed. It is preferable that the cross member has a cross shape and one of the longitudinal member and the transverse member extends in the longitudinal direction of the beam member.

  In this case, it becomes possible to arrange a cross-shaped convex portion at the intersection of the four precast concrete floor slabs arranged, and by forming a concave portion at the corner of the precast concrete floor slab, Can be shared with precast concrete slabs. Therefore, it is possible to perform horizontal positioning with respect to the four precast concrete floor slabs with one cross-shaped convex portion, and it is possible to reduce the number of members of the convex portion, thereby reducing the cost. Can do.

  Further, in the floor pit structure according to the present invention, a plurality of buffer plates are interposed between the beam member and the precast concrete floor slab at intervals along the longitudinal direction of the beam member. Is preferred.

  In this case, the two opposite sides of the precast concrete slab are not placed directly on the upper surface of the girder and have a buffering effect by interposing a buffer plate. It is possible to reduce the burden of the load on the (mounting portion) and to suppress the occurrence of breakage.

  Moreover, it is preferable that the floor pit structure which concerns on this invention is filled with the solidification material between the said buffer plates between the said beam material and the said precast concrete floor slab.

  In this case, the space between the girder and the two sides of the precast concrete slab can be filled with the buffer plate and the solidified material without a gap. Thereby, the load concerning a precast concrete floor slab can be more reliably supported by two sides.

According to the floor pit structure of the present invention and the construction method thereof, for example, with the change of the production line, the precast concrete floor slab can be easily removed, and the direction of the girder supporting the precast concrete floor slab is changed. The floor pit layout can be changed easily and at low cost.
Moreover, according to the floor pit structure of the present invention and the construction method thereof, the precast concrete floor slab is supported on two sides, so that the precast concrete floor slab can be prevented from being damaged.

It is the perspective view which showed the floor pit structure by embodiment of this invention. It is the perspective view which expanded a part of floor pit structure shown in FIG. It is a top view which shows a part of floor pit structure, Comprising: It is a figure which shows the state before mounting a PC floor slab on a girder. It is an enlarged view of the plate part shown in FIG. It is an AA arrow directional view shown in FIG. It is an enlarged view which shows the fitting structure of the plate shown in FIG. 5, and the notch part of PC floor slab. It is a BB arrow directional view shown in FIG. It is a figure which shows the structure of PC floor slab, Comprising: (a) is the top view seen from the downward | lower direction, (b) is a side view.

  Hereinafter, a floor pit structure and a construction method thereof according to embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the floor pit structure 1 according to the present embodiment includes, for example, a floor of a room 11 and a floor under a floor having a space of a predetermined width for producing a product in a factory 10 having a production line. A pit portion 12 is formed.
Here, in the present embodiment, the chamber 11 has a rectangular shape in plan view, the width direction (short side direction) is defined as the horizontal direction X, and the longitudinal direction is defined as the vertical direction Y.

  As shown in FIG. 2, the floor pit structure 1 is erected on the pit bottom 12 a and is arranged at regular intervals in each of the horizontal direction X and the vertical direction Y orthogonal to each other in the horizontal plane. A column member 2 and a girder member 3 made of steel beams that are joined to and erected on the upper end surface 2a (see FIGS. 4 and 5) of the column member 2 and arranged in the longitudinal direction along the longitudinal direction Y. And a precast concrete floor slab (hereinafter referred to as a PC floor slab 4) constructed by placing each of the two opposing support ends 4a, 4a on the adjacent girders 3, 3 in the arrangement direction, I have.

The column member 2 is made of reinforced concrete (RC), is formed in a square shape in a cross-sectional view, is integrally placed on the pit bottom 12a, and has the same arrangement interval in both the horizontal direction X and the vertical direction Y (see FIG. L1 and L2) shown in FIG. All of the upper end surfaces 2a of the plurality of column members 2, 2,... Have the same height (level).
The dimensions and arrangement intervals L1 and L2 of the column members 2 are the shape and weight of the PC floor slab 4, the weight of equipment / equipment that runs or is installed on the PC floor slab 4, the height of the floor pit portion 12, etc. It is set appropriately according to the conditions. In the present embodiment, for example, a cross section having a side of 70 cm is employed.
Four anchor bolts 21 (see FIG. 5) projecting from the upper end surface 2a are embedded in the column 2. Using this anchor bolt 21, the girder 3 is detachably fixed by bolt fastening.

  As shown in FIGS. 3 to 5, the girder 3 is an H-section steel having a width of 30 cm smaller than the side dimension of the pillar material 2 and a height of 40 cm in this embodiment, and the length dimension is, for example, The length of the column material 2 is three spans. That is, when the arrangement intervals L1 and L2 (see FIG. 2) of the column members 2 are 4 m, the beam member 3 is a beam member 3 having a length dimension of 12 m. In addition, there is no restriction | limiting in the length of the girder 3, and it can set arbitrarily.

The beam member 3 is detachably fixed to the upper end surface 2a of the column member 2 by bolt fastening. Specifically, as shown in FIG. 5, the anchor bolt 21 embedded in the beam 2 and protruding from the upper end surface 2 a is inserted through the bolt hole (not shown) formed in the lower flange 31 of the beam 3. The nut 22 is tightened and fixed.
The girder 3 can change the longitudinal direction from, for example, the vertical direction Y to the horizontal direction X by removing the nut 22 from the pillar material 2.

  As shown in FIGS. 3 to 6, a plate 5 (convex) is fixed to the upper surface 3 a of the beam member 3 by welding at a portion located on the column member 2 of the beam member 3, and the surface direction is directed in the vertical direction. Part, positioning member). The plate 5 has a cross shape in a plan view in which the vertical member 51 and the horizontal member 52 cross each other, and the longitudinal direction of the vertical member 51 is arranged in the longitudinal direction of the beam member 3 (that is, the vertical direction Y). ing. The cross-shaped plate 5 is disposed at the intersection of the four PC floor slabs 4 arranged, and serves as a positioning member shared by the four PC floor slabs 4.

  As shown in FIG. 8 (a), the PC floor slab 4 has a square shape in plan view, and the support ends 4a and 4a located at one opposing side edge are on the upper surface 3a of the beam member 3, respectively. 6 and a rubber plate 6 (buffer plate) shown in FIG. As shown in FIGS. 1 and 3, a plurality of PC floor slabs 4 are arranged without gaps in the horizontal direction X and the vertical direction Y, and each support end 4 a is linear in a region half the width of the beam member 3. It is placed and supported from below.

  Note that the PC floor slab 4 may be manufactured locally, for example, at the time of construction of the floor pit structure 1, or may be manufactured at a production factory other than the local site and carried into the local site. Further, the PC floor slab 4 can be provided with a facility outlet and an air conditioning opening (not shown).

  As shown in FIGS. 5 and 6, the rubber plate 6 is a thin plate having a thickness of about 10 mm, for example, and a plurality of rubber plates 6 (see FIG. 5) with an appropriate interval in the extending direction of the beam 3 on the upper surface 3a of the beam 3. 3 is arranged between the column members 3 and 3.

  As shown in FIGS. 8 (a) and 8 (b), on the lower surface 4 b of the four corners of the PC floor slab 4, there are cutout portions 41 (concave portions) that can be fitted to the aforementioned plate 5 with a moderate spacing. Is formed. The notch 41 is continuously cut out over two surfaces forming the corner of the PC floor slab 4, and the depth of cut is set to be at least larger than ½ of the thickness dimension of the plate 5. With such dimensions, as shown in FIG. 6, the recesses formed by facing the notch portions 41, 41 of the adjacent PC floor slabs 4, 4 are fitted into the plate 5, and the PC The floor slab 4 is positioned in the horizontal direction.

  In the state where the notch 41 is fitted to the plate 5, the gap between the notch 41 and the plate 5 is filled with the grout material 7 (solidifying material) as shown in FIG. As the grout material 7, for example, non-shrink mortar is used.

  Further, between the rubber plates 6 and 6 on the upper surface 3a of the girder 3, an unshrinkable mortar material 8 (solidifying material) which is the same material as the grout material 7 is placed over the entire surface, and the PC floor slab 4 It is fixed in close contact with the support end 4a of the lower surface 4b.

Next, the construction method of the floor pit structure 1 having the above-described configuration will be described in detail based on the drawings.
First, as shown in FIG. 1, the floor pit portion 12 is excavated at a predetermined position, and concrete is placed on the side wall and the bottom wall to construct an outer wall portion 13 composed of a frame material for forming the chamber portion 11. To do. Next, a plurality of pillar members 2, 2,... Are erected on the pit bottom 12a of the floor pit portion 12 by concrete placement. At this time, the column members 2 are arranged at regular intervals along the horizontal direction X and the vertical direction Y in the pit bottom 12a. Also, as shown in FIG. 5, anchor bolts 21 are embedded in the upper end surface 2a of the column member 2, and the bolt tip side is projected from the upper end surface 2a. In the present embodiment, four anchor bolts 21 are embedded for each column member 2.

  Then, in a different process, for example, at the site or factory, as shown in FIG. 3, a cross-shaped plate 5 is welded to a predetermined position of the upper surface 3a of the beam member 3 in plan view. At this time, the extending direction of the longitudinal member 51 is arranged in the length direction of the beam member 3. Further, a rubber plate 6 is fixed to a predetermined position on the upper surface 3a of the girder 3 by adhesion.

  Next, as shown in FIG. 5, the girder 3 is fixed to the upper end surface 2 a of the column member 2. Specifically, the lower flange 31 of the beam member 3 is inserted into the anchor bolt 21 protruding from the upper end surface 2a of the column member 2, and the nut 22 is tightened and fixed. At this time, since the girder 3 is only fixed to the column 2 by bolt fastening, it has a structure that can be easily attached and detached.

  And the non-shrink mortar 8 is put in the area | region between the rubber plates 6 and 6 in the upper surface 3a of the girder material 3 after installing on the pillar material 2. FIG. At this time, the height of the non-shrink mortar material 8 is set slightly higher than the height of the rubber plate 6. As a result, when the PC floor slab 4 is placed, the variation in the height of placement is eliminated, and the non-shrinkable mortar 8 is uniformly filled with no gap between the PC floor slab 4 and the girders 3. In addition, when placing the non-shrinkable mortar material 8, it is preferable to place a backer or the like around the place of placement in order to prevent the material from flowing out.

  Next, the opposing support ends 4 a and 4 a (see FIG. 3) of the PC floor slab 4 are placed on the girders 3 via rubber plates 6, respectively. Then, four PC floor slabs 4 fitted to the cross-shaped plate 5 are arranged. At this time, the notch 41 of the PC floor slab 4 is fitted to the plate 5 and a gap is formed between the notch 41 and the plate 5 in this fitted state, so that the grout material 7 is filled into the gap and solidified. . When the grout material 7 and the non-shrink mortar material 8 are solidified, the mounting of the PC floor slab 4 is completed.

Thereby, the plurality of PC floor slabs 4, 4,... Are arranged without gaps in the horizontal direction X and the vertical direction Y, and the floor pit structure 1 of the present embodiment is constructed.
The floor pit part 12 constructed in this way can be used as equipment and infrastructure supply space, and can contribute to the improvement of flexibility. Thereby, the facilities arrange | positioned on the floor surface on the PC floor slab 4 can be decreased, a production space can be ensured, and the space can be effectively used.

Next, the effect | action of the floor pit structure mentioned above is demonstrated in detail based on drawing.
In the floor pit structure 1 of the present embodiment, as shown in FIGS. 3, 5, and 7, the horizontal movement of the PC floor slab 4 is restricted by the plate 5 with respect to the girders 3 and is positioned at a desired position. Therefore, the PC floor slab 4 can be easily attached to or removed from the girder 3. Therefore, it is possible to efficiently perform construction such as changing the specifications of the girder 3 or changing to a PC slab having a different weight.

  Since the column members 2 are arranged at regular intervals in each of the vertical and horizontal directions, the arrangement direction of the beam members 3 can be changed to the horizontal direction only by removing the beam members 3 from the column members 2. It is possible to change the direction to either X or Y. Therefore, for example, even when the arrangement direction of the girders 3 in the floor pit portion 12 shown in FIG. There is an advantage of not having to do it.

  Further, the floor pit structure 1 of the present embodiment has a two-side support structure in which the two support ends 4a and 4a of the PC floor slab 4 are supported by the girders 3, and is supported by lines instead of dots, and each PC. Since the horizontal movement of the floor slab 4 is regulated by the plate 5 provided on the beam member 3, the horizontal load of the PC floor slab 4 at the time of the earthquake is transmitted to the beam member 3 through the plate 5 (and the grout material 7). Therefore, it is possible to prevent the relative displacement in the horizontal direction with respect to the beam member 3 from occurring.

  Furthermore, in the present embodiment, the notch 41 of the PC floor slab 4 can be fitted into the plate 5 fixed to the girder 3 with a moderate gap between the notch 41 and the plate 5. It is possible to perform alignment by moving the PC floor slab 4 within a gap formed between them. Therefore, the mounting accuracy of the PC floor slab 4 can be improved. And after positioning, since the grout material 7 is filled in the said clearance gap, the girder material 3 and the PC floor slab 4 can be fixed via the plate 5.

  Furthermore, in the present embodiment, it becomes possible to arrange the cross-shaped plate 5 at the intersection of the four PC floor slabs 4 arranged, and by forming the notches 41 at the corners of the PC floor slab 4. The plate 5 can be shared by the four PC floor slabs 4. Therefore, it is possible to perform horizontal positioning with respect to the four PC floor slabs 4 with one cross-shaped plate 5, and it is possible to reduce the number of members of the plate 5, thereby reducing the cost. Can do.

  Further, in the case of the present embodiment, the two opposite sides (support ends 4a) of the PC floor slab 4 are not placed directly on the upper surface 3a of the beam member 3, and the rubber plate 6 is interposed. Therefore, it is possible to reduce the load of the load on the support portion (mounting portion) of the PC floor slab 4 and to suppress the occurrence of breakage.

  Furthermore, in this embodiment, the space between the girder 3 and the two sides of the PC floor slab 4 is filled with the rubber plate 6 and the non-shrinkable mortar material 8 without any gap, so that the load applied to the PC floor slab 4 can be more reliably ensured Can be supported by the support ends 4a and 4a on two sides.

As described above, in the floor pit structure and the construction method thereof according to the present embodiment, the PC floor slab 4 can be easily removed, for example, along with the change of the production line, and the girders that support the PC floor slab 4 By changing the direction of 3, the floor pit layout can be changed easily and at low cost.
Moreover, in this Embodiment, there exists an effect which can prevent the failure | damage of PC floor slab 4 by making PC floor slab 4 2 side support.

As mentioned above, although the embodiment of the floor pit structure and the construction method thereof according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the gist thereof. In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with known constituent elements.
For example, in the present embodiment, the cross-shaped plate 5 is provided in plan view, and is shared by the four PC floor slabs 4, but is not limited to this shape. For example, a plate 5 (convex portion) may be provided for each PC floor slab 4, and a concave portion such as a notch formed in the PC floor slab 4 can be set to a shape corresponding to the shape of the convex portion. .

  In the present embodiment, the rubber plate 6 is inserted between the PC floor slab 4 and the girder 3 and further filled with a non-shrink mortar material 8 (solidifying material). The configuration is not limited. For example, the rubber plate 6 and the non-shrink mortar material 8 may be omitted, and the support end 4 a of the PC floor slab 4 may be directly placed on the girder 3. The point is that the PC floor slab 4 is placed on the girder 3 and the horizontal movement is restricted by the positioning member fixed to the girder 3 such as the plate 5 as in the present embodiment. .

  In addition, as a fixing method of the beam member 3 and the column member 2, bolt fastening using the anchor bolt 21 embedded in the column member 2 is used. It is also possible to adopt means.

DESCRIPTION OF SYMBOLS 1 Floor pit structure 2 Column material 2a Upper end surface 3 Girder material 3a Upper surface 4 PC floor slab (precast concrete floor slab)
4a Support end 5 Plate (convex part, positioning member)
6 Rubber plate (buffer plate)
7 Grout material (solidification material)
8 Non-shrink mortar (solidified material)
12 Floor pit part 12a Pit bottom board 21 Anchor bolt 41 Notch part (concave part)
X Horizontal direction Y Vertical direction

Claims (6)

A floor pit structure provided in a space of a predetermined area,
Pillars that are erected on the bottom of the pit and arranged at regular intervals in the vertical and horizontal directions,
A girder joined to the upper end surface of the column member and arranged in one of the vertical and horizontal directions with the extending direction oriented,
A precast concrete floor slab constructed by placing each of the two opposing sides on the girder adjacent to each other in the arrangement direction;
With
A floor pit structure, wherein the girder is provided with a positioning member for restricting horizontal movement of the precast concrete slab. The positioning member is a protrusion protruding from the upper surface of the girder,
The lower surface of the precast concrete slab is provided with a concave portion that is gently fitted to the convex portion,
2. The floor pit structure according to claim 1, wherein a solidified material is filled in a gap between the concave portion and the convex portion in a state where the concave portion is fitted to the convex portion. The convex portion is provided in a portion located on the column member of the beam member,
The convex portion has a cross shape in a plan view in which the vertical member and the horizontal member intersect each other, and the extending direction of one of the vertical member and the horizontal member is arranged toward the longitudinal direction of the beam member. The floor pit structure according to claim 2, wherein the floor pit structure is provided.   4. A plurality of buffer plates are interposed between the beam member and the precast concrete floor slab at intervals along the longitudinal direction of the beam member. The floor pit structure according to claim 1.   The floor pit structure according to claim 4, wherein a solidifying material is filled between the buffer plates between the girder and the precast concrete slab. A method for constructing a floor pit structure according to any one of claims 1 to 5,
Fixing the girder to the upper end surface of the pillar material, and arranging the girder in the longitudinal direction in any one of the vertical and horizontal directions; and
Providing the positioning member on the girder and regulating the movement of the precast concrete slab in the horizontal direction;
A step of installing each of the two opposite sides of the precast concrete floor slab on the girder adjacent to each other in the arrangement direction;
A method for constructing a floor pit structure characterized by comprising:

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