JP2021173077A - Construction method of overhanging slab - Google Patents

Abstract

To reduce cost and improve workability by properly securing a work traffic line.SOLUTION: A construction method of an overhanging slab fixes a slab member 1 to a structure 2 in a state of outwardly overhanging from the structure 2. A base end side portion of the slab member 1 comprises an upwardly extending rising portion 12. The construction method performs: a temporary fixing step of connecting the rising portion 12 of the slab member 1 and an extension member 31 extending from a support member 21 toward the inside of the structure 2 by a connection material 41 in a state where the base end side portion of the slab member 1 is mounted on the support member 21 at the structure 2 side, to temporarily fix the slab member 1 to the structure 2; and a final fixing step of joining the temporarily fixed slab member 1 and structure 2 side by pouring of concrete, to finally fix the slab member 1.SELECTED DRAWING: Figure 6

Description

The present invention relates to a method for constructing a protruding slab in which a slab member is fixed to a structure in a protruding state in which the slab member is projected outward from the structure.

In the above-mentioned method of constructing a pop-out slab, a temporary fixing step of temporarily fixing the slab member to a structure such as a building and a slab in which the slab member temporarily fixed by placing concrete and the structure side are integrated and slabbed. A main fixing step of actually fixing the member is performed (see, for example, Patent Document 1).

In the construction method described in Patent Document 1, a projecting portion projecting from the base end side of the slab member to the structure side is provided. Therefore, in the temporary fixing step, the projecting portion disposed at the base end side portion of the slab member The portion is connected to a beam or the like on the structure side, and the tip end side portion of the slab member is received and supported by a temporary support such as a support arranged on the lower side thereof.

Special Fair 3-48970 Gazette

However, in the construction method described in Patent Document 1, a temporary support work must be arranged below the tip end side portion of the slab member, and the concrete placed in the main fixing step performed after the temporary fixing step. It is necessary to support the tip end side portion of the slab member until it hardens. Therefore, not only the temporary support work must be arranged, but also the temporary support work must be arranged for a long period of time, which makes it difficult to secure the work flow line, which leads to an increase in cost and a decrease in workability. become.

In view of this situation, a main object of the present invention is to provide a method for constructing a pop-out slab, which can appropriately secure a work flow line, reduce costs, and improve workability.

The first characteristic configuration of the present invention is a method of constructing a pop-out slab in which a slab member is fixed to a structure in a pop-out state in which the slab member is projected outward from the structure.
The base end side portion of the slab member is provided with a rising portion extending upward.
In a state where the base end side portion of the slab member is placed on the support member on the structure side, the rising portion of the slab member and the extension member extending inward from the support member are connected to each other. Temporary fixing step of connecting with and temporarily fixing the slab member to the structure,
The point is to perform the main fixing step of joining the slab material temporarily fixed by placing concrete and the structure side to finally fix the slab member.

According to this configuration, in the temporary fixing step, the rising portion on the slab member side and the extension member on the structure side are connected by a connecting material in a state where the base end side portion of the slab member is placed on the support member. Therefore, the slab member can be appropriately temporarily fixed to the structure by utilizing the pulling force of the connecting member without disposing a temporary support for supporting the tip end side portion of the slab member. Therefore, the temporary support work can be omitted, the work flow line can be appropriately secured, the cost can be reduced, and the workability can be improved.

The second characteristic configuration of the present invention is that the connecting material is configured so that its length can be adjusted.

According to this configuration, the position (height) of the tip side portion of the slab member can be adjusted by adjusting the length of the connecting member, and the position (height) of the tip end side portion of the slab member is desired. The position can be adjusted to the position (desired height).

In the third characteristic configuration of the present invention, a beam arranged in a state of being aligned with the support member and a reinforcing member rigidly joined over the support member and the beam are provided on the inner side of the structure.
The reinforcing member is provided as the extension member, and the connecting member is connected to the reinforcing member.

Since the slab member is placed on the support member, it is conceivable that the support member is twisted (curved downward) due to the load of the slab member or the like. Therefore, according to this configuration, a reinforcing member rigidly joined over the support member and the beam is provided. Since the reinforcing member extends in a direction orthogonal to the support member from the vicinity of the load acting point of the slab member mounted on the support member, it is possible to prevent twisting from acting on the support member. Moreover, since the connecting member is connected to the reinforcing member, the reinforcing member can be used as a member for temporarily fixing the slab member, and the cost can be reduced and the configuration can be simplified.

In the fourth characteristic configuration of the present invention, a plurality of the slab members are provided in a state of being arranged adjacent to each other in the length direction of the support member.
The extension member is arranged at a position corresponding to a boundary portion of adjacent slab members, and two connecting members connected to rising portions of the adjacent slab members are connected to each other.

According to this configuration, the connection target of the two connecting members connected to the rising portions of the adjacent slab members is an extension member arranged at a position corresponding to the boundary portion of the adjacent slab members. As a result, two adjacent slab members can be temporarily fixed by using one extension member, cost can be reduced and the configuration can be simplified, and the extension member can be placed at an appropriate position. By disposing the slab members, the two adjacent slab members can be temporarily fixed in a stable posture.

In the fifth characteristic configuration of the present invention, the support member is provided with an engaged member at a position where the slab member is scheduled to be arranged, and the base end side portion of the slab member is engaged with the engaged member. Equipped with flexible engaging members
In the temporary fixing step, the engaging member of the slab member is engaged with the engaged member of the support member, and the base end side portion of the slab member is placed on the support member.

According to this configuration, in the temporary fixing step, when the base end side portion of the slab member is placed on the support member, the engaging portion of the slab member is engaged with the engaged member of the support member, so that the support member It becomes easier to perform the positioning work and the mounting work of the slab member with respect to the slab member, and the workability can be improved.

Side view with the pop-out slab installed Floor plan with the pop-out slab installed The figure which shows the process of placing a slab member on a support member Enlarged side view of the main part with the slab member mounted on the support member Enlarged plan view of the main part with the slab member mounted on the support member Side view showing the temporary fixing process Perspective view showing the connection state by the connecting material in the temporary fixing process. Perspective view showing the connection state by the connecting material in the temporary fixing process. Perspective view showing the connection point between the connecting material and the building in the middle of this fixing process.

An embodiment of a method for constructing a pop-out slab according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the construction method of this pop-out slab is to fix the slab member 1 to the building 2 in a pop-out state in which the slab member 1 is projected outward from the building 2 (corresponding to a structure). The method.

The slab member 1 is made of, for example, precast concrete, is formed in an L shape in a side view as shown in FIG. 1, and is formed in a horizontally long rectangular shape in a plan view as shown in FIG. ing. As shown in FIG. 1, the slab member 1 has a protruding portion 11 extending from the proximal end side (right side in FIG. 1) to the tip end side (left side in FIG. 1) and an upper portion above the proximal end side portion of the protruding portion 11. A rising portion 12 extending to the side is provided. The protruding portion 11 of the slab member 1 exists on the outer side of the building 2 with respect to the outer wall line A of the building 2 and is provided so as to function as an eave, and the rising portion 12 of the slab member 1 is the eaves thereof. It is provided to function as a parapet extending upward from the protruding portion 11 as a slab. The protruding portion 11 is formed in an inclined shape in which the upper surface portion thereof is located on the lower side toward the tip side. The rising portion 12 is formed in the shape of an upright wall extending upward at the base end side end portion of the protruding portion 11.

The slab member 1 is provided with a fixing portion 13 (for example, an anchor bar), and the slab member 1 is fixed to the building 2 by fixing the fixing portion 13 to the cast-in-place concrete slab 3. The fixing portion 13 is formed in an L shape that extends from the upper side to the lower side in the rising portion 12 of the slab member 1 and then is bent inward of the building 2. A part of the fixing portion 13 is embedded in the slab member 1, a portion other than the embedded portion protrudes from the slab member 1 and extends inward of the building 2, and a portion protruding from the slab member 1 is a concrete slab. It is fixed in 3.

As shown in FIGS. 1 and 2, a support member 21 (for example, a support beam) for supporting the slab member 1 is provided at the outer end of the building 2, and the slab member 1 is mounted on the support member 21. It is provided in a state where it can be placed. As shown in FIG. 2, a plurality of slab members 1 are provided adjacent to each other in the length direction of the support members 21, and the support members 21 support the plurality of slab members 1.

In this embodiment, as shown in FIG. 1, the slab member 1 is not directly mounted on the support member 21, but the load receiving portion of the slab member 1 is placed on the mounting portion forming member connected to the support member 21. 14 (for example, a bolt) is placed so that the load of the slab member 1 is applied to the support member 21.

The rib plate 22 and the plate 23 are connected to the support member 21 as a mounting portion forming member, and the mounting portion that directly receives the load of the slab member 1 is from the upper end portion (upper flange 21a) of the support member 21. Is also arranged one step above.

The rib plate 22 includes a first rib plate 22a that extends over the upper and lower flanges 21a and 21b of the H-shaped steel that is the support member 21, and a second rib plate 22b that extends upward from the upper flange 21a. .. The plate 23 is provided with a first plate 23a extending horizontally from the upper flange 21a to the outer side of the building 2 and a second plate 23b extending horizontally with the upper ends of the second rib plates 22b connected to each other. There is.

In this way, the mounting portion that directly receives the load of the slab member 1 is the second plate 23b that is arranged one step above the upper flange 21a of the support member 21. Further, by arranging the rib plate 22 and the plate 23, the support member 21 is arranged on the inner side of the outer side end portion of the building 2 in the inner / outer direction (left-right direction in FIG. 1) of the building 2. ing.

In this embodiment, the rib plate 22 and the plate 23 as the mounting portion forming member are arranged, but the load receiving portion 14 of the slab member 1 is supported without the rib plate 22 and the plate 23 being arranged. It can also be placed on the upper flange 21a of 21 so that the load of the slab member 1 acts directly on the support member 21.

The load receiving portion 14 (bolt) of the slab member 1 is supported by the support bracket 15 as shown in FIGS. 4 (A) and 5. A part of the support bracket 15 is embedded in the slab member 1 and supported by the slab member 1, and a load is received at a portion protruding from the base end surface portion (inner end surface portion of the building 2) of the slab member 1. The unit 14 is provided. The load receiving portion 14 is configured so that the height (position) in the vertical direction with respect to the support bracket 15 can be adjusted by screwing the screws. By adjusting the height of the load receiving portion 14 in the vertical direction, the lower end portion of the load receiving portion 14 is brought into contact with the second plate 23b, and the load receiving portion 14 is placed on the second plate 23b.

As shown in FIG. 2, the building 2 has a column-beam frame having a column 4 and a first beam (girder) 5. On the inner side of the building 2, pillars 4 are arranged in the longitudinal direction of the support member 21 at intervals of a predetermined span, and the first beam 5 is provided so as to extend over the pillars 4.

As for the beams, as shown in FIG. 2, not only the first beam 5 extending between the columns 4 but also a plurality of beams such as the second to fifth beams 6 to 9 are provided. The second beam 6 (small beam) is provided between the first beam 5 and the support member 21 in a state of being arranged in parallel with the first beam 5 on the side approaching the support member 21. The third beam 7 (girder) extends in a direction orthogonal to the first beam 5 and is provided in a state extending over the column 4 and the second beam 6. The fourth beam 8 (small beam) extends in a direction orthogonal to the first beam 5 and is provided in a state extending over the second beam 6 and the support member 21. The fifth beam 9 (small beam) extends in a direction orthogonal to the first beam 5 and is provided in a state extending over the first beam 5 and the support member 21.

As shown in FIG. 2, an extension member 31 (beam) extending in a direction orthogonal to the support member 21 is provided at a position corresponding to the boundary portion of the adjacent slab member 1. As shown in FIGS. 1 and 2, the extension member 31 is rigidly joined (for example, welded or bolted) to the first beam 5 and the support member 21 in a state extending over the first beam 5 and the support member 21. ), And is configured as a reinforcing member to reinforce the support member 21.

As a method of constructing the pop-out slab, a temporary fixing step of temporarily fixing the slab member 1 to the building 2 and a main fixing step of temporarily fixing the slab member 1 to the building 2 by placing concrete are sequentially performed to perform the slab. The member 1 is fixed to the building 2. Hereinafter, the temporary fixing step and the main fixing step will be described.

(Temporary fixing process)
In the temporary fixing step, as shown in FIG. 6, the rising portion 12 and the extending member 31 of the slab member 1 are placed in a state where the base end side portion of the protruding portion 11 of the slab member 1 is placed on the support member 21. Is connected by a connecting member 41 to temporarily fix the slab member 1 to the building 2.

As shown in FIG. 3, the slab member 1 is weighted by a heavy machine such as a crane, the slab member 1 is moved to the planned arrangement position of the support member 21, and the slab member 1 bounces as shown in FIG. The base end side portion of the protrusion 11 is placed on the support member 21 via the rib plate 22 and the plate 23. As described above, in this embodiment, since the mounting portion forming member is composed of the rib plate 22 and the plate 23, the load receiving portion 14 of the slab member 1 is mounted on the second plate 23b. The slab member 1 is placed on the support member 21. Incidentally, as shown in FIG. 3, a deck plate 32 is arranged at a place where concrete is placed in the main fixing step, but in FIG. 6, the deck plate 32 is omitted.

In this embodiment, the rib plate 22 and the plate 23 are connected to the support member 21, and the mounting portion of the slab member 1 is arranged one step above the support member 21, as shown in FIG. The lower end of the concrete slab 3 (arrangement position of the deck plate 32) is also arranged one step above the support member 21. Therefore, the rib plate 22 and the plate 23 are also connected to the second beam 6 arranged on the inner side of the building 2 one by one from the support member 21, and the lower end portion of the concrete slab 3 (arrangement of the deck plate 32). The installation position) is also arranged one step above the second beam 6.

As shown in FIG. 3, the support member 21 is provided with a pair of left and right engaged members 33 at positions where the slab member 1 is scheduled to be arranged, while the support member 21 is located at the proximal end side of the protruding portion 11 of the slab member 1. Is provided with a pair of left and right engaging members 34 that can be engaged with each of the pair of left and right engaged members 33. Therefore, in the temporary fixing step, as shown in FIGS. 4B and 5, the engaging member 34 of the slab member 1 is engaged with the engaged member 33 of the support member 21, and the slab member 1 is ejected. The base end side portion of the portion 11 is placed on the support member 21. As a result, due to the engagement between the engaged member 33 and the engaging member 34, the slab member 1 in the length direction of the support member 21 and the inside / outside direction of the building 2 with respect to the planned arrangement position of the support member 21. The position is being adjusted. By moving the slab member 1 downward from the upper side with respect to the support member 21, the engaged member 33 and the engaging member 34 are engaged with each other.

As shown in FIGS. 4B and 5, the engaged member 33 is provided with two L-shaped upright wall portions in a plan view (see FIG. 5), and the two upright wall portions are spaced apart from each other. Are arranged apart from each other. As shown in FIGS. 4 and 5, a gap is provided between the second plate 23b and the slab member 1 in the inside / outside direction of the building 2 (horizontal direction in FIG. 4 and vertical direction in FIG. 5). A closing plate 35 is provided.

As shown in FIGS. 4B and 5, the engaging member 34 includes a first engaging member 34a, a support member 34b, and a second engaging member 34c. The first engaging member 34a is formed of an L-shaped plate-like body in a side view, and is provided so as to be able to come into contact with the inner side portion of the building 2 of the engaged member 33. The second engaging member 34c is made of a plate-like body, and is provided so as to be able to come into contact with the outer side portion of the building 2 in the engaged member 33. In the engaging member 34, the supporting member 34b is located between the two standing wall portions of the engaged member 33, and the first engaging member 34 is engaged in the inside / outside direction of the building 2 (the left-right direction in FIG. 4 and the up-down direction in FIG. 5). The engaged member 33 is engaged with the engaged member 33 in a state where the engaged member 33 is sandwiched between the member 34a and the second engaging member 34c. The support member 34b is composed of a rod-shaped body extending in the inward and outward directions of the building 2, and supports the building 2 in a state of penetrating the first engaging member 34a and the second engaging member 34c. In the support member 34b, the outer side portion of the building 2 is embedded in the slab member 1 and supported by the slab member 1, and the first engaging member 34a is located at the portion protruding from the slab member 1 to the inward side of the building 2. And a second engaging member 34c is provided.

When mounting the slab member 1 on the support member 21, not only the position of the support member 21 is adjusted in the length direction of the support member 21 and the inside / outside direction of the building 2 with respect to the planned arrangement position of the support member 21, but also the position of the slab member 1 is adjusted. The posture is adjusted and the position of the slab member 1 in the vertical direction (height) is also adjusted.

On the support member 21 side, as shown in FIGS. 1 and 4 (A), a contact member 36 (bolt) capable of contacting the base end surface portion (inner end surface portion of the building 2) of the slab member 1 is provided. It is equipped. Therefore, the posture of the slab member 1 is adjusted (tilt adjustment) by abutting the contact member 36 against the base end surface portion of the slab member 1. By abutting the abutting member 36 against the base end surface portion of the slab member 1, the slab member 1 can be adjusted to an appropriate installation posture in which the protruding portion 11 extends in the horizontal direction and the rising portion 12 extends in the vertical direction. can.

The abutting member 36 is connected to the second rib plate 22b and is provided in a posture extending in the horizontal direction (inside and outside of the building 2). In the slab member 1, an L-shaped contact plate 37 is embedded in a portion to which the contact member 36 is to be applied.

Regarding the position adjustment of the slab member 1 in the vertical direction (height), as shown in FIG. 4A, the load receiving portion 14 of the slab member 1 moves up and down with respect to the support bracket 15 by screwing the screws. The height (position) in the direction can be adjusted freely. Therefore, when the load receiving portion 14 of the slab member 1 is placed on the second plate 23b, the slab member in the vertical direction (height) is adjusted by adjusting the height of the load receiving portion 14 in the vertical direction. The position of 1 is being adjusted.

In this way, as shown in FIG. 6, the position of the support member 21 is adjusted in the length direction of the support member 21, the inside / outside direction of the building 2, and the vertical direction (height) with respect to the planned arrangement position of the support member 21. Further, when the slab member 1 is placed on the support member 21 with the posture adjusted, the rising portion 12 of the slab member 1 and the extension member 31 are connected by the connecting member 41.

A building-side connecting portion 42 (hardware) is provided on the upper portion of the extension member 31, and a slab member-side connecting portion 43 (hardware) is provided on the rising portion 12 of the slab member 1. The connecting member 41 is composed of, for example, a chain block or the like, and is connected in a tense state (tensile state) over the building side connecting portion 42 and the slab member side connecting portion 43. The length of the connecting member 41 is adjustable. Thereby, by adjusting the length of the connecting member 41, the position (height) of the tip side portion of the slab member 1 can be adjusted, and the position (height) of the tip end side portion of the slab member 1 can be adjusted to a desired position. It can be adjusted to (desired height). Incidentally, in FIG. 7, the intermediate portion of the connecting member 41 is shown in a simplified manner.

As described above, the extension member 31 provided with the building-side connection portion 42 is arranged at a position corresponding to the boundary portion of the adjacent slab member 1 as shown in FIGS. 2 and 7. Therefore, as shown in FIG. 7, two connecting members 41 connected to the rising portions 12 of the adjacent slab members 1 are connected to one extending member 31. The rising portion 12 of each of the adjacent slab members 1 is provided with a slab member side connecting portion 43, and the connecting member 41 is connected to each of the two slab member side connecting portions 43. Each of the two connecting members 41 is connected to one building-side connecting portion 42 provided in the extension member 31. An adjacent connecting portion 44 extending over the rising portion 12 of the adjacent slab member 1 is provided, and the adjacent slab member 1 is connected by the adjacent connecting portion 44. Incidentally, as shown in FIG. 7, a deck plate 32 is arranged at a place where concrete is placed in the main fixing step.

(Main fixing process)
In this fixing step, as shown in FIG. 1, the concrete slab 3 is constructed in a state where the slab member 1 temporarily fixed by placing concrete and the building 2 are joined.

As shown in FIG. 8, since the rising portion 12 of the slab member 1 and the extension member 31 are connected by the connecting member 41 by performing the temporary fixing step, this connecting state is maintained in the main fixing step. The concrete is being poured as it is. Therefore, after the reinforcing bars 51 are arranged, the filling 52 is filled in the portion corresponding to the upper part of the building side connecting portion 42 of the extension member 31, and concrete is cast. As a result, the concrete slab 3 can be constructed by placing concrete while maintaining the connected state in which the rising portion 12 of the slab member 1 and the extending member 31 are connected by the connecting member 41. As shown in FIG. 9, an open space 53 in which concrete does not exist is formed at a portion corresponding to the upper part of the building side connection portion 42 of the extension member 31. Therefore, after the concrete is hardened, the connecting member 41 is removed from the building side connecting portion 42 through the open space 53, and the open space 53 is filled with concrete or the like by post-construction. Incidentally, in FIGS. 8 and 9, the intermediate portion of the connecting member 41 is shown in a simplified manner.

[Another Embodiment]
Other embodiments of the present invention will be described.
It should be noted that the configurations of the respective embodiments described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the extension member 31 is rigidly joined to the first beam 5 and the support member 21 to also serve as a reinforcing member for reinforcing the support member 21, but the extension member 31 is Separately, a reinforcing member rigidly joined to the first beam 5 and the support member 21 may be provided.

(2) In the above embodiment, the two connecting members 41 connected to the rising portions 12 of the adjacent slab members 1 are connected to one extending member 31, but the rising portions 12 of the slab member 1 are connected to the two connecting members 41. The number of connecting members 41 to be connected to one extending member 31 can be appropriately changed, such as connecting one connected connecting member 41 to one extending member 31.

1 Slab member 2 Building (structure)
5 1st beam (girder)
12 Rising part 21 Support member 31 Extension member (reinforcing member)
33 Engagement member 34 Engagement member 41 Connecting material

Claims (5)

In the construction method of the pop-out slab in which the slab member is fixed to the structure in the pop-out state in which the slab member is popped out from the structure.
The base end side portion of the slab member is provided with a rising portion extending upward.
In a state where the base end side portion of the slab member is placed on the support member on the structure side, the rising portion of the slab member and the extension member extending inward from the support member are connected to each other. Temporary fixing step of connecting with and temporarily fixing the slab member to the structure,
A method of constructing a pop-out slab in which a slab material temporarily fixed by placing concrete and a structure side are joined to perform a main fixing step of fixing the slab member. The method for constructing a pop-out slab according to claim 1, wherein the connecting material has an adjustable length. On the inner side of the structure, a beam arranged alongside the support member and a reinforcing member rigidly joined over the support member and the beam are provided.
The method for constructing a pop-out slab according to claim 1 or 2, wherein the reinforcing member is provided as the extension member and the connecting member is connected. A plurality of the slab members are provided so as to be arranged adjacent to each other in the length direction of the support member.
3. The method for constructing a pop-out slab according to any one item. The support member is provided with an engaged member at a position where the slab member is scheduled to be arranged, and the base end side portion of the slab member is provided with an engaging member capable of engaging with the engaged member. ,
In the temporary fixing step, the engaging member of the slab member is engaged with the engaged member of the support member, and the base end side portion of the slab member is placed on the support member. The method for constructing a pop-out slab according to any one of 4.

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