JP6368584B2 - Foundation construction method - Google Patents

Description

  The present invention relates to a foundation construction method.

  A foundation construction method is known in which a steel foundation beam is installed on abandoned concrete via a spacer (a jig for fixing the foundation beam), and then a concrete slab is constructed by placing concrete on the abandoned concrete (for example, , See Patent Document 1). In the technique disclosed in Patent Document 1, by embedding a plurality of studs protruding from the lower surface of the steel foundation beam with the concrete for the foundation slab, the foundation slab and the steel foundation beam are embedded. Are joined.

Japanese Patent Laid-Open No. 11-229398

  In the technique disclosed in Patent Document 1, since the foundation slab and the steel foundation beam are joined together with the placement of the concrete for the foundation slab, the labor of joining the foundation slab and the steel foundation beam is reduced. . However, there is room for further improvement in order to improve the workability of the foundation slab.

  An object of the present invention is to improve the workability of a foundation slab in consideration of the above facts.

The foundation construction method according to the first aspect includes a foundation slab construction process for constructing a foundation slab having a joint, a foundation beam joining process for installing a steel foundation beam and joining the steel foundation beam and the joint. .

According to the foundation construction method according to the first aspect , after constructing a foundation slab having a joint in the foundation slab construction process, the steel foundation beam is joined to the joint in the foundation beam joining process. Therefore, when the foundation slab is constructed in the foundation slab construction process, the steel foundation beam does not become an obstacle, so that the construction performance of the foundation slab is improved.

  In addition, after the foundation slab is constructed, the steel foundation beam is joined to the joint in the foundation beam joining step, so that the steel foundation beam can be joined to the joint using the foundation slab as a scaffold. Therefore, it becomes easy to join the foundation slab and the steel foundation beam.

The foundation construction method according to the second aspect is the foundation construction method according to the first aspect , wherein in the foundation slab construction step, a slab side joining member as the joining portion is projected from the upper surface of the foundation slab, and the foundation In the beam joining step, the steel foundation beam from which the beam side joining member protrudes from the lower surface is disposed on the slab side joining member, and concrete is placed between the steel foundation beam and the foundation slab. The foundation slab and the steel foundation beam are joined.

According to the foundation construction method according to the second aspect , in the foundation slab construction process, the slab side joining member as the joining portion is projected from the upper surface of the foundation slab. Next, in the foundation beam joining process, the steel foundation beam with the beam-side joining member protruding from the lower surface is placed on the slab-side joining member, and concrete is placed between the steel foundation beam and the foundation slab. Join the slab and the steel foundation beam. Therefore, for example, an anchor for joining a steel foundation beam is not necessary, so that the labor for joining the foundation slab and the steel foundation beam is reduced.

The foundation construction method according to the third aspect is the foundation construction method according to the first aspect . In the foundation slab construction process, the foundation slab constitutes the foundation slab and the slab side joining member as the joining portion protrudes from the side surface. A plurality of precast floor slabs are installed with the side surfaces facing each other, and in the foundation beam joining step, the steel foundation beams are installed between the side surfaces of the adjacent precast floor slabs. The cement-based filler is filled, and the adjacent precast slabs are joined together, and the foundation slab and the steel foundation beam are joined.

According to the foundation construction method according to the third aspect , by constructing the foundation slab with a plurality of precast slabs, for example, it is not necessary to arrange the slab reinforcement of the foundation slab or to place concrete in the field. The workability of the foundation slab is improved.

  Further, in the foundation beam joining step, the cement-based filler is filled between the side surfaces in a state where the steel foundation beam is installed between the side surfaces of the adjacent precast slabs. Thereby, adjacent precast floor slabs are joined via a cement type filler and a slab side joining member, and a foundation slab is formed. Moreover, the formed foundation slab and the steel foundation beam are joined. Therefore, the foundation slab and the steel foundation beam can be easily joined.

  As described above, according to the foundation construction method according to the present invention, the workability of the foundation slab can be improved.

It is a longitudinal section showing the foundation constructed by the foundation construction method concerning a 1st embodiment of the present invention. (A) And (B) is a longitudinal cross-sectional view explaining the joining method of the foundation slab shown in FIG. 1, and a steel-frame foundation beam. (A) And (B) is a longitudinal section corresponding to Drawing 2 (A) and Drawing 2 (B) explaining a modification of a construction method of a foundation concerning a 1st embodiment, respectively. (A) And (B) is a longitudinal cross-sectional view explaining the construction method of the foundation which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the precast floor slab constructed by the foundation construction method which concerns on 3rd Embodiment of this invention, a steel-frame foundation beam, and a steel column. (A) And (B) is a longitudinal cross-sectional view explaining the construction method of the foundation based on 3rd Embodiment. It is a longitudinal cross-sectional view corresponding to FIG. 6 (A) explaining the modification of the construction method of the foundation which concerns on 3rd Embodiment.

  First, the first embodiment will be described.

  FIG. 1 shows a foundation (foundation structure) 10 constructed by the foundation construction method according to the present embodiment. The foundation 10 is a direct foundation formed on the ground 12, and is implemented as a floating foundation, for example. On this foundation 10, a structure (upper structure) (not shown) is constructed. The foundation 10 is not limited to a floating foundation, and may be another foundation.

  The foundation 10 includes a foundation slab (foundation base plate) 20, an outer peripheral foundation beam 22, a steel foundation beam 30, and a floor slab 40. The foundation slab 20 is formed of reinforced concrete. The foundation slab 20 is formed along a bottom surface 14A of an excavation recess 14 formed by digging the ground 12 into a concave shape. An outer peripheral foundation beam 22 is provided on the outer peripheral portion of the foundation slab 20.

  The outer peripheral foundation beam 22 is formed of reinforced concrete. The outer circumferential foundation beam 22 is formed in a frame shape along the outer circumferential portion of the foundation slab 20 and bears the earth pressure of the ground 12. A plurality of steel foundation beams 30 are arranged inside the outer circumferential foundation beam 22. The peripheral foundation beam 22 is not limited to reinforced concrete but may be steel.

  The plurality of steel frame foundation beams 30 are formed of H-shaped steel, and have a pair of upper and lower upper flange portions 30A and a lower flange portion 30B, and a web portion 30C that connects the upper flange portion 30A and the lower flange portion 30B. ing. These steel foundation beams 30 are joined in a lattice shape in plan view. The steel foundation beam 30 is not limited to the H-shaped steel, and may be, for example, an I-shaped steel, a C-shaped steel, a box steel, or the like. Further, the steel foundation beam 30 is not limited to the lattice shape, and for example, the steel foundation beam 30 may be appropriately thinned from the lattice shape, or may be triangular in plan view.

  Each steel foundation beam 30 is joined to the foundation slab 20 via a post-cast concrete projecting portion 24 projecting from the upper surface 20A of the foundation slab 20. The post-cast concrete projecting portion 24 will be described later.

  An end plate 32 is provided at the end of the steel foundation beam 30. A plurality of studs 34 are provided on the outer surface of the end plate 32, and the steel foundation beam 30 and the outer circumferential foundation beam 22 are joined by embedding these studs 34 in the outer circumferential foundation beam 22.

  In addition, the joining method of the edge part of the steel foundation beam 30 and the outer periphery foundation beam 22 can be suitably changed according to the structure classification of the outer periphery foundation beam 22. FIG. For example, when the outer peripheral foundation beam 22 is a steel frame, the end plate 32 may be omitted, and the end of the steel foundation beam 30 and the outer peripheral foundation beam 22 may be joined by welding or the like.

  A raising member 36 is provided on the upper flange portion 30 </ b> A of the steel foundation beam 30. The raising member 36 is formed in a cross-sectional hat shape having an upper opening, and is joined to the upper flange portion 30A of the steel foundation beam 30 by welding, bolts, or the like. A height H of the pit (underground space) 16 is secured by the raising member 36, the steel foundation beam 30, and the post-cast concrete projecting portion 24.

  A plurality of deck plates (not shown) are installed between the adjacent raising members 36, and a floor slab 40 is formed on these deck plates. The floor slab 40 is made of reinforced concrete and constitutes a floor on the first floor. The floor slab 40 is joined to the foundation slab 20 via a plurality of steel foundation beams 30. Thereby, a sandwich structure is constituted by the floor slab 40, the steel foundation beam 30, and the foundation slab 20. The raising member 36 can be omitted as appropriate.

  Next, an example of a construction method for the foundation 10 will be described.

  First, the basic slab construction process will be described. First, as shown in FIG. 1, the ground 12 is excavated into a concave shape to form an excavation concave portion 14. Next, as shown in FIG. 2A, a plurality of slab bars 26 are appropriately arranged in the excavation recess 14.

  Further, a plurality of slab side joint reinforcing bars 28 as slab side joining members are arranged at the joint portion with the steel foundation beam 30. Each slab-side joint reinforcing bar 28 is bent in a hat shape with the lower part opened, and the upper part 28U as a joint part is arranged so that the upper surface 20A of the basic slab 20 protrudes upward. In addition, the plurality of slab-side joint reinforcing bars 28 are arranged in a state of being spaced apart in the longitudinal direction of the steel foundation beam 30.

  Next, concrete for the foundation slab 20 is placed in the excavation recess 14 and cured. Thereby, the basic | foundation slab 20 with which the upper part 28U of the slab side joining reinforcing bar 28 protruded from the upper surface 20A is formed. In addition, the lower part 20L of the slab side joining reinforcing bar 28 is embedded in the foundation slab 20.

  Next, the foundation beam joining process will be described. First, the steel foundation beam 30 is installed above the slab side joint rebar 28, and the beam side joint stud 38 protruding downward from the lower flange portion 30B of the steel foundation beam 30 is seen from the side as an upper portion 28U of the slab side joint rebar 28. Wrap in. The steel foundation beam 30 is placed on the foundation slab 20 via a spacer (not shown). Moreover, the beam side joining stud 38 is an example of a beam side joining member.

  Next, the mold frame 41 is temporarily installed along both ends in the width direction of the lower flange portion 30B of the steel foundation beam 30, and the concrete for the post-cast concrete projecting portion 24 is placed in the mold frame 41 and cured. . Thereby, as shown in FIG. 2 (B), the post-cast concrete projecting portion 24 in which the beam side joining stud 38 and the slab side joining rebar 28 are embedded is formed. The steel foundation beam 30 and the foundation slab 20 are joined via the post-cast concrete projecting portion 24, the beam-side joining stud 38, and the slab-side joining reinforcing bar 28. The formwork 41 is appropriately removed after the post-cast concrete projecting portion 24 is formed.

  Next, the outer peripheral foundation beam construction process will be described. As shown in FIG. 1, on the outer periphery of the foundation slab 20, a not-shown formwork for the outer foundation beam 22 is temporarily installed, the beam main bars and the like are appropriately arranged, and concrete is placed to Form. At this time, by embedding the stud 34 protruding from the end plate 32 of the steel foundation beam 30 in the outer circumference foundation beam 22, the outer circumference foundation beam 22 and the steel foundation beam 30 are joined. The outer peripheral foundation beam 22 may be constructed in parallel with the steel foundation beam 30.

  Next, the floor slab construction process will be described. First, the raising member 36 is joined to the upper flange portion 30A of the steel foundation beam 30 by welding, bolts, or the like. The raising member 36 may be joined to the upper flange portion 30A of the steel foundation beam 30 in advance in a factory or the like.

  Next, a plurality of deck plates (not shown) are installed between the adjacent raising members 36, slab bars (not shown) are appropriately arranged on the deck plates, and concrete for the floor slab 40 is placed and cured. Thereby, the floor slab 40 on the first floor is formed, and the floor slab 40 and the foundation slab 20 are joined via the plurality of steel foundation beams 30 to form a sandwich structure. Further, pits 16 are formed between the floor slab 40 and the foundation slab 20.

  Next, the operation and effect of the first embodiment will be described.

  According to the foundation construction method according to the present embodiment, in the foundation slab construction process, the slab-side joining rebar 28 as a joint is protruded from the upper surface 20A of the foundation slab 20. Next, in the foundation beam joining process, the steel foundation beam 30 in which the beam-side joining stud 38 protrudes from the lower surface of the lower flange portion 30B is disposed on the slab-side joining reinforcement 28, and the steel foundation beam 30 and the foundation slab 20 Concrete is placed between the two to form a post-cast concrete projecting portion 24. Thus, the steel foundation beam 30 and the foundation slab 20 are joined via the post-cast concrete projecting portion 24, the beam-side joining stud 38, and the slab-side joining reinforcing bar 28.

  As described above, in the present embodiment, in the foundation slab construction process, after the foundation slab 20 in which the slab side joining rebar 28 protrudes from the upper surface 20A is constructed (constructed), in the foundation beam joining process, the steel frame is attached to the slab side joining reinforcing bar 28. The foundation beam 30 is joined. Therefore, when the slab reinforcement 26 of the foundation slab 20 is arranged or the concrete for the foundation slab 20 is placed, the steel foundation beam 30 does not become an obstacle, so that the workability of the foundation slab 20 is improved.

  In addition, after the foundation slab 20 is constructed in the foundation slab construction process, the steel foundation beam 30 is joined to the slab-side joining rebar 28 in the foundation beam joining process. 30 can be joined. Therefore, it becomes easy to join the foundation slab 20 and the steel foundation beam 30.

  Furthermore, in this embodiment, in the foundation slab construction process, the slab side joining rebar 28 is projected in advance from the upper surface 20A of the foundation slab 20, and the steel foundation beam 30 is joined to the slab side joining rebar 28. An anchor or the like for joining the bone foundation beam 30 can be omitted. Therefore, the labor of joining the foundation slab 20 and the steel foundation beam 30 is reduced.

  Moreover, the workability of the steel foundation beam 30 is improved by making the foundation beam (steel foundation beam 30) steel instead of reinforced concrete. Moreover, weight reduction of the foundation 10 can be achieved by using the steel-structured steel foundation beam 30. Therefore, it becomes easy to realize a floating foundation. Furthermore, by forming the pit 16 between the foundation slab 20 and the floor slab 40, the foundation 10 can be reduced in weight while effectively utilizing the underground space.

  Moreover, the foundation slab 20 and the floor slab 40 are joined through a plurality of steel foundation beams 30 to form a sandwich structure. Thereby, the rigidity and proof stress of the foundation 10 can be ensured, making the required cross-sectional area of the steel foundation beam 30 small. Therefore, the foundation 10 can be further reduced in weight.

  Next, a modification of the first embodiment will be described.

  In the said 1st Embodiment, although the example which provided the slab side joining reinforcement 28 as a junction part in the foundation slab 20 in the foundation slab construction process was shown, it does not restrict to this. For example, as shown in FIG. 3A, the base slab 20 may be provided with a joining plate 42 as a joining portion.

  Specifically, the joining plate 42 is formed in a plate shape by a steel plate or the like, and is disposed along the upper surface 20 </ b> A of the basic slab 20. A stud 44 embedded in the foundation slab 20 is provided on the lower surface 42 </ b> A of the joining plate 42.

  In this modification, for example, in the foundation slab construction process, the joining plate 42 is disposed so that the stud 44 wraps with the slab muscle 26 in a side view, and the concrete for the foundation slab 20 is hit to the lower surface 42A of the joining plate 42. Install and cure. Thereby, the stud 44 is embedded in the foundation slab 20, and the joining plate 42 and the foundation slab 20 are joined via the stud 44.

  Next, as shown in FIG. 3B, the lower flange portion 30B of the steel foundation beam 30 is placed on the joining plate 42 in the foundation beam joining step. Next, both end portions in the width direction of the lower flange portion 30B and both end portions in the width direction of the joining plate 42 are welded and joined.

  Thus, in this modification, by using the joining plate 42, it is not necessary to temporarily form a formwork or concrete for the post-cast concrete projecting portion 24 (see FIG. 2B). improves.

  The lower flange portion 30B of the steel foundation beam 30 and the joining plate 42 may be joined by a bolt or the like. Further, a deformed bar, an anchor or the like may be provided on the lower surface of the joining plate 42 instead of the stud 44. Furthermore, the shape of the joining plate 42 can be changed as appropriate.

  Moreover, in the said 1st Embodiment, although the example using the slab side joining reinforcement 28 as a slab side joining member was shown, it does not restrict to this. As the slab side joining member, for example, a deformed reinforcing bar or a stud may be used.

  Moreover, in the said 1st Embodiment, although the example using the beam side joining stud 38 as a beam side joining member was shown, it does not restrict to this. As the beam-side joining member, for example, a deformed bar may be used.

  Moreover, although the said 1st Embodiment showed the example which comprised the sandwich structure by the floor slab 40, the steel-frame foundation beam 30, and the foundation slab 20, the sandwich structure does not necessarily need to be comprised.

  Furthermore, in the said 1st Embodiment, although the example which formed the foundation 10 in the underground was shown, you may form the foundation 10 on the ground.

  Next, a second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, attaches | subjects and abbreviate | omits description suitably, and abbreviate | omits description also about the construction procedure similar to 1st Embodiment suitably.

  As shown in FIG. 4A, in the foundation 48 according to the second embodiment, a foundation slab 50 is constructed using a plurality of precast floor slabs 52. Specifically, the precast floor slab 52 is formed into a thin block shape from precast concrete. Inside the precast floor slab 52, a plurality of slab bars 54 and 56 are appropriately embedded in two horizontal directions. The slab reinforcement 56 as the slab side joining member protrudes from the side surface 52S of the precast floor slab 52.

  As will be described later, the protruding amount of the slab bar 56 at the upper end is shortened so that the lower portion of the steel foundation beam 30 can be easily inserted between the side surfaces 52S of the precast slab 52. On the other hand, the slab bars 56 at the lower end are overlapped, and a lap joint, a flare welded joint, or the like is possible.

  Here, in the second embodiment, a plurality of precast slabs 52 are installed on the bottom surface 14A of the excavation recess 14 in the foundation slab construction process. At this time, the adjacent precast floor slabs 52 are installed in a state in which the side surfaces 52S from which the slab reinforcement 56 protrudes face each other.

  Next, in the foundation beam joining step, the lower part of the steel foundation beam 30 is inserted between the side surfaces 52S of the adjacent precast floor slabs 52. In the present embodiment, a plurality of studs 58 are provided in two rows on the lower surface of the lower flange portion 30B of the steel foundation beam 30. These studs 58 increase the integrity of the steel foundation beam 30 and the foundation slab 50 and also function as a spacer for adjusting the installation height of the steel foundation beam 30.

  Next, a cement-type filler 60 such as mortar or grout is filled between the side surfaces 52S of the adjacent precast slabs 52 and cured. Thereby, the adjacent precast floor slabs 52 are joined together via the slab reinforcement 56 and the cement filler 60, and the foundation slab 50 is formed. Further, the lower portion of the steel foundation beam 30 is embedded in the cement filler 60, and the steel foundation beam 30 and the foundation slab 50 are joined via the cement filler 60 and the slab reinforcement 56. Thereafter, in the floor slab construction process, a floor slab 40 (see FIG. 1) is formed.

  Next, the operation and effect of the second embodiment will be described.

  According to the foundation construction method according to the present embodiment, by constructing the foundation slab 50 with a plurality of precast floor slabs 52, for example, the arrangement of the slab reinforcement 56 of the foundation slab 50 and the placement of concrete can be performed on site. Since it becomes unnecessary, the workability of the foundation slab 50 is improved. Furthermore, since the precast slab 52 is manufactured at a factory or the like, the construction period can be shortened while ensuring quality.

  Further, in the foundation beam joining step, the cement-based filler 60 is filled between the side surfaces 52S in a state where the lower portion of the steel foundation beam 30 is disposed between the side surfaces 52S of the adjacent precast floor slabs 52. Thereby, the adjacent precast floor slabs 52 are joined together via the slab reinforcement 56 and the cement filler 60, and the foundation slab 50 is formed. Further, the lower part of the steel foundation beam 30 is embedded in the cement filler 60, and the steel foundation beam 30 and the foundation slab 50 are joined via the slab reinforcement 56 and the cement filler 60. Therefore, the foundation slab 50 and the steel foundation beam 30 can be easily joined.

  Furthermore, by embedding the lower part of the steel foundation beam 30 in the cement-based filler 60, it is possible to increase the rigidity of the steel foundation beam 30 while reducing the labor for joining the foundation slab 50 and the steel foundation beam 30. . Therefore, since the required cross-sectional area of the steel foundation beam 30 can be reduced, the weight of the foundation 48 can be reduced.

  In the present embodiment, an example in which the slab muscle 56 is used as the slab side joining member is shown, but the present invention is not limited to this. As the slab side joining member, for example, a stud or a deformed reinforcing bar may be used.

  Next, a third embodiment will be described. In addition, the thing of the structure similar to 2nd Embodiment attaches | subjects the same code | symbol, attaches | subjects and abbreviate | omits description suitably, and abbreviate | omits description also about the construction procedure similar to 2nd Embodiment suitably.

  As shown in FIG. 5, in the third embodiment, an independent foundation-type foundation (independent foundation) 70 that supports a steel column 72 is formed using a plurality of precast floor slabs 82 and steel foundation beams 30. Specifically, the plurality of steel foundation beams 30 are joined in a cross shape in plan view. A steel column 72 is erected on the intersection of these steel foundation beams 30. The steel column 72 and the intersection of the steel foundation beam 30 are joined by bolts, welding, or the like (not shown).

  In this embodiment, the steel column 72 is formed of a square steel pipe, but the steel column 72 may be formed of a round steel pipe or H-shaped steel.

  Here, in the third embodiment, in the basic slab construction process, four precast floor slabs 82 are arranged vertically and horizontally on the ground 12 so that a cross joint 74 is formed in a plan view. At this time, the adjacent precast floor slabs 82 are installed in a state where the side surfaces 82S from which the slab reinforcement 56 protrudes face each other. In addition, in the case of the foundation 70 of an independent foundation type, you may abbreviate | omit the slab reinforcement 56 of an upper end suitably.

  Next, as shown in FIG. 6A, in the foundation beam joining step, the lower part of the steel foundation beam 30 joined in a cross shape in plan view is formed with a cross formed between the four precast floor slabs 82. Into the joint 74. The plurality of steel foundation beams 30 may be joined in a cross shape in plan view after being installed on the joint 74.

  Next, the cement filler 60 is filled between the side surfaces 82S of the adjacent precast slabs 82 and cured. Thereby, the adjacent precast floor slabs 82 are joined together via the slab reinforcement 56 and the cement filler 60, and the foundation slab 80 is formed. Further, the lower part of the steel foundation beam 30 is embedded in the cement-based filler 60, and the steel foundation beam 30 and the foundation slab 80 are joined via the cement-based filler 60 and the slab reinforcement 56. Thereby, the foundation 70 of the independent basic form is formed.

  In addition, after installing the steel foundation beam 30 on the joint 74, the steel column 72 may be installed on the steel foundation beam 30 and joined.

  Next, the operation and effect of this embodiment will be described.

  According to the present embodiment, the steel column 72 is supported by the plurality of steel foundation beams 30 joined in a cross shape in plan view and integrated with the foundation slab 80. Therefore, it is possible to reduce the weight of the foundation 70 while ensuring the support performance of the steel column 72.

  Further, when the steel column 72 is directly joined to the foundation slab 80, for example, it is necessary to embed an anchor bolt or the like for the steel column 72 in the foundation slab 80. In this embodiment, the steel column 72 is a steel foundation beam. It is joined to the foundation slab 80 through 30. Therefore, the steel column 72 can be joined to the steel foundation beam 30 by bolts, welding, or the like. Therefore, since it is not necessary to drive anchor bolts or the like for the steel column 72 into the foundation slab 80, the workability can be improved and the cost can be reduced.

  Next, a modification of the third embodiment will be described.

  In the said 3rd Embodiment, although the lower part of the steel foundation beam 30 was embedded in the cement-type filler 60, it was not restricted to this. For example, as shown in FIG. 7, the beam formation of the steel foundation beam 30 may be made lower than the precast floor slab 82, and the entire steel foundation beam 30 may be embedded in the cement-based filler 60.

  Moreover, in the modification shown by FIG. 7, the U-shaped reinforcing bar 84 is used as a slab side joining member. Moreover, the stud 86 which wraps with the U-shaped reinforcing bar 84 is protrudingly provided by the web part 30C of the steel foundation beam 30, and the integrity of the steel foundation beam 30 and the foundation slab 80 is improved.

  Moreover, although the example which made the foundation 70 the independent foundation form was shown in the said 3rd Embodiment, you may make the foundation 70 into a cloth foundation form or a solid foundation form, for example. Moreover, when the foundation 70 is made into a solid foundation type, the steel foundation beam 30 may be joined in a lattice shape in plan view as in the first embodiment.

  The first to third embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and the first to third embodiments and various modifications may be used in appropriate combination. Of course, the present invention can be carried out in various modes within the scope of the present invention.

10 Foundation 20 Foundation slab 28 Slab side joint reinforcement (slab side joint member)
30 Steel foundation beam 38 Beam side joint stud (beam side joint member)
48 foundation 50 foundation slab 52 precast floor slab 52S side face 56 slab reinforcement (slab side joint member)
60 Cement-based filler 70 Foundation 80 Foundation slab 82 Precast floor slab 82S Side surface 74 Joint

Claims (2)

Foundation slab construction process for constructing foundation slabs with joints,
After the foundation slab construction process, a foundation beam joining process of installing a steel foundation beam and joining the steel foundation beam and the joint part;
Equipped with a,
In the foundation slab construction process, the slab side joining member as the joining portion is projected from the upper surface of the foundation slab,
In the foundation beam joining step, the steel foundation beam from which the beam side joining member protrudes from the lower surface is disposed at a position away from the slab side joining member, and concrete is provided between the steel foundation beam and the foundation slab. To join the foundation slab and the steel foundation beam,
Method of constructing the foundation. Foundation slab construction process for constructing foundation slabs with joints,
After the foundation slab construction process, a foundation beam joining process of installing a steel foundation beam and joining the steel foundation beam and the joint part;
With
In the foundation slab construction process, a plurality of precast floor slabs constituting the foundation slab and projecting a slab side joining member as the joint from the side face are installed in a state where the side faces are opposed to each other.
In the foundation beam joining step, with the steel foundation beam installed between the side surfaces of the adjacent precast slabs, a cement filler is filled between the side surfaces, and the adjacent precast slabs are joined together. Joining the foundation slab and the steel foundation beam;
Foundation construction method.