JP6529241B2 - Building foundation structure and construction method of building foundation structure - Google Patents

Description

  The present invention relates to a building foundation structure configured by supporting a foundation beam by footing, and a method of constructing the building foundation structure.

  There is a building foundation structure configured by supporting a steel foundation beam by footings provided on the foundation bottom. For example, Patent Document 1 discloses a cloth foundation provided with a foundation footing made of reinforced concrete and a steel foundation beam made of H-shaped steel installed on the upper surface of the foundation footing.

  However, in such a building foundation structure, it is necessary to change the level of the upper surface of the foundation beam without changing the thickness of the footing or the beam formation of the foundation beam in order to provide a step on the floor slab supported by the foundation beam. In some cases, steps must be formed on the base bottom. For this reason, there is a concern that the construction efficiency of the building may be reduced by forming a step on the bottom of the foundation. For example, complex drilling operations must be performed to form steps on the foundation bottom, and it is difficult to move heavy equipment on the foundation bottom having steps.

JP 2001-146752 A

  In view of such facts, it is an object of the present invention to change the level of the upper surface of the foundation beam supported by the footing without changing the thickness of the footing and the beam formation of the foundation beam and forming no step on the foundation bottom. Do.

  According to the invention of the first aspect, there is provided a first footing portion provided on a foundation bottom, a steel first foundation beam having a lower portion embedded in the first footing portion and supported by the first footing portion, and And a force transmission means provided on a first foundation beam for transmitting a vertical force acting on the first foundation beam to the first footing portion.

  In the invention of the first aspect, the first force transmission from the lower end surface of the first foundation beam to the first footing portion and the force transmission from the first foundation beam to the first footing portion by the force transmission means (1) Much of the vertical force acting on the foundation beam can be transmitted to the first footing part, thereby suppressing the decrease in the vertical support force of the first footing part by embedding the first foundation beam in the first footing can do. For example, vertical support performance substantially equivalent to the case of mounting the first foundation beam on the upper surface of the first footing portion can be exhibited by the first footing portion.

  Thus, by changing the depth of embedding the lower portion of the first foundation beam in the first footing portion, the thickness of the first footing portion and the beam formation of the first foundation beam are not changed, and a step is formed in the foundation bottom Otherwise, the level of the top surface of the first foundation beam supported by the first footing portion can be changed.

  Moreover, since a level | step difference is not formed in a foundation bottom, construction efficiency of a building can be improved. For example, the amount of excavated soil at the bottom of the foundation can be reduced, and it is not necessary to perform complicated digging work to form a step at the bottom of the foundation, and compared to forming steps at the bottom of the foundation, Heavy equipment can be moved easily.

  The invention according to the second aspect is the building foundation structure according to the first aspect, wherein the second footing portion provided on the foundation bottom and the second footing portion are supported by the second footing portion, and the upper surface is different from the upper surface of the first foundation beam. And a second base beam made of steel having a height.

  In the invention of the second aspect, the thickness of the first footing portion and the beam configuration of the first foundation beam are not changed, and no step is formed in the foundation bottom (the upper surface is the foundation bottom at a certain level). An elevation difference can be made between the top surface and the top surface of the second foundation beam. Thereby, a floor level difference can be formed in the floor slab provided on the 1st foundation beam and the 2nd foundation beam.

  Also, a floor slab provided on the first foundation beam and the second foundation beam by using the first footing section and the second footing section having the same thickness, and the first foundation beam and the second foundation beam having the same beam configuration. Floor step can be formed.

  The invention of a third aspect relates to the method of constructing a building foundation structure according to the first or second aspect, comprising: supporting the first foundation beam by a support member installed on the foundation bottom; and concrete on the foundation bottom And placing the support member and the lower portion of the first foundation beam in the concrete to form the first footing portion.

  In the invention of the third aspect, the construction of the first footing section is carried out simultaneously with the construction of the section 0 of the building, in the middle of the construction of the section 0 of the building, or after the construction of the section 0 of the building is completed. Can. Also, for example, in the case where the first footing portion is formed of concrete, it is possible to construct a section 0 section of the building without waiting for the hardening of the concrete. That is, the construction of Section 0 of the building can be performed without being greatly influenced by the construction of the first footing portion. By these, construction efficiency of a building can be improved.

  Since the present invention is configured as described above, it is possible to change the level of the upper surface of the foundation beam supported by the footing without changing the thickness of the footing and the beam formation of the foundation beam and forming no step on the foundation bottom.

It is a front view showing a building foundation structure concerning an embodiment of the present invention. It is a front view which shows the support structure of the beam by footing which concerns on embodiment of this invention. It is a front view which shows the construction method of the building foundation structure concerning the embodiment of the present invention. It is a front view showing the variation of the force transmission means concerning the embodiment of the present invention. It is a front view showing the variation of the force transmission means concerning the embodiment of the present invention. It is a front view showing the variation of the force transmission means concerning the embodiment of the present invention. It is a front view showing the variation of the building foundation structure concerning the embodiment of the present invention. It is a front view which shows the variation of the supporting structure of the beam by the footing which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, a building foundation structure according to an embodiment of the present invention and a method of constructing the building foundation structure will be described.

  In the front view of FIG. 1, a foundation structure of the building 10 of the present embodiment (hereinafter, referred to as “building foundation structure 12”) is shown. The building foundation structure 12 includes a reinforced concrete footing 14 as a first footing portion, a beam 16 as a first foundation beam, a reinforced concrete footing 18 as a second footing portion, and a beam 20 as a second foundation beam. Is configured.

  The beam 16 is composed of a beam end member 22 and a beam member 24 which are H-shaped steel and are equal in beam formation. The beam 20 is constituted by a beam end member 26 and a beam member 28 which is made of H-shaped steel and whose beam configuration is equal to that of the beam end member 22.

  Beam central part which beam member 28 and beam member 24 were united by shifting beam member 28 and beam member 24 up and down by the level difference of the upper surface of beam 20 and the upper surface of beam 16 The beam end member 26, the beam center member 30, and the beam end member are formed by bolting the beam end members 26, 22 to the left and right ends of the beam central member 30 by the splice plates 32, 34, respectively. 22 forms one foundation beam 36 integrated. The left and right end portions of the beam central member 30 and the beam end members 26 and 22 may be joined by on-site welding.

  As shown in the front view of FIG. 2, the footing 14 is installed on the base bottom 38. The end of the beam 16 is joined to the connection of the steel column 40 supported by the footing 14 and a plurality of beams are extended from the column 40 in four directions, and the lower part is embedded in the footing 14 and is fixed to the footing 14. It is supported.

  A plurality of headed studs 44 as force transmitting means are attached to the lower part of the web 42 of the beam 16 embedded in the footing 14 so as to be embedded in the footing 14. Headed studs 44 transmit the vertical force acting on beam 16 to footing 14.

  As shown in FIG. 1, the footing 18 is installed on the base bottom 38. A plurality of beams 20 are connected to the connection of a steel column 46 supported by the footing 18 and extended in four directions from the column 46, and the beam 20 is placed on the upper surface of the footing 18 to be a footing 18. It is supported by The thicknesses of the footing 14 and the footing 18 are the same.

  On the foundation beam 36, a reinforced concrete floor slab 48 is provided. That is, the beams 16, 20 support the floor slab 48.

  By mounting the beam 20 on the upper surface of the footing 18 and embedding the lower end portion of the beam 16 in the footing 14, the upper surface of the beam 20 is at a height different from the upper surface of the beam 16 (in this example, the upper surface of the beam 20 is It is higher than the upper surface of the beam 16 and forms a step near the center of the foundation beam 36. Thus, the floor level difference 50 is formed on the floor slab 48.

  Next, a construction example of the footing 14 is shown as a front view of FIGS. 3A to 3C as a method of constructing a building foundation structure.

  First, as shown in FIG. 3 (a), the beam end member 22 is supported by the jacks 54 as support members installed on the foundation bottom 38, so that the beam member 52 is placed at a predetermined position above the foundation bottom 38. Place. The beam member 52 is configured to have a column 40 and beam end members 22 which are provided with a plurality of projecting ends in four directions from the column 40 by joining end portions to connection portions of the column 40. The support member may be a temporary material or may be a member integrally provided with the beam member 52.

  Next, as shown in FIG. 3B, a method of erecting a section 0 of the building 10 is performed, such as forming the foundation beam 36 by joining the beam central member 30 (beam member 24) to the beam end member 22. In FIG. 3 (b), a situation is shown in which the beams 16 are supported by the jacks 54 installed on the foundation bottom 38. If the weight is about zero, it can be sufficiently supported by a temporary support member (in this example, the jack 54).

  Next, as shown in FIG. 3 (c), after the construction of Section 0 of the building 10 is completed, a formwork (not shown) is built on the foundation bottom 38, and rebars (in the built formwork ( Not shown). Then, concrete U is cast on the foundation bottom 38 in the formwork, and the lower portions of the jack 54 and the beam 16 are embedded in the concrete U to form the footing 14.

  Next, as shown in FIG. 3C, a floor slab 48 is formed on the foundation beam 36.

  In this example, although the concrete casting for forming the footing 14 was performed after the construction of the section 0 of the building 10 was completed, the concrete casting for forming the footing 14 was It may be performed simultaneously with the construction of Section 0 of the building 10, may be performed on the way of construction of Section 0 of the building, or may be performed after the construction of Section 0 of the building 10 is completed. For example, in FIG. 3C, if a joint that bolt-bonds the beam end member 22 and the beam central member 30 (beam member 24) by the splice plates 32 and 34 is positioned outside the footing 14 After the concrete casting is performed to form the footing 14, the construction work of joining the beam central member 30 to the beam end member 22 can be performed.

  Further, the footing 18 can be applied by a method substantially similar to that described with reference to FIGS. 3 (a) to 3 (c). In this case, the lower part of the beam 20 is not embedded in the concrete U at the time of placing concrete in FIG. 3 (c).

  Next, the operation and effects of the building foundation structure according to the embodiment of the present invention and the method of constructing the building foundation structure will be described.

  In the building foundation structure 12 of the present embodiment, as shown in FIG. 2, the force transmission from the lower end face of the beam 16 to the footing 14 and the force transmission from the beam 16 to the footing 14 by the headed stud 44 Thus, the vertical force acting on the beam 16 can be transmitted to the footing 14. Also, the vertical force transmitted from the beam 16 to the footing 14 by the headed stud 44 is mainly transmitted to a portion of the footing 14 above the lower end surface of the beam 16.

  Therefore, it is possible to bear much of the vertical force acting on the beam 16 in a wide range of the footing 14. Also, compared to the building foundation structure in which the headed stud 44 is not provided (the vertical force acting on the beam 16 is transmitted to the footing 14 only by the supporting force transfer from the lower end surface of the beam 16 to the footing 14) The vertical force transmitted by the supporting force transmission from the lower end face of the beam 16 to the footing 14 can be reduced, thereby preventing the punching failure in the footing 14.

  As a result, it is possible to suppress the decrease in the vertical supporting force of the footing 14 due to the beam 16 being embedded in the footing 14. For example, the vertical support performance substantially equivalent to the case where the beam 16 is placed on the upper surface of the footing 14 can be exerted on the footing 14. In addition, the footing 14 with a small thickness can have high vertical supporting force.

  Further, in the building foundation structure 12 of the present embodiment, as described above, sufficient vertical support performance can be exhibited even if the beam 16 is embedded in the footing 14, so as shown in FIG. By changing the depth of embedding the lower part of 16 into the footing 14, the thickness of the footing 14 and the beam configuration of the beam 16 are not changed, and no step is formed in the base bottom 38 (base bottom 38 with a certain level of upper surface) , The level of the upper surface of the beam 16 supported by the footing 14 can be changed.

  Furthermore, in the building foundation structure 12 of the present embodiment, as shown in FIG. 1, no step is formed in the foundation bottom 38, so that the construction efficiency of the building 10 can be improved. For example, the amount of excavated soil in the foundation bottom 38 can be reduced, and it is not necessary to perform complicated digging work to form steps on the foundation bottom 38, and compared to forming steps on the foundation bottom 38, The heavy equipment can be easily moved on the base bottom 38.

  Further, in the building foundation structure 12 of the present embodiment, as shown in FIG. 1, the thickness of the footing 14 and the beam configuration of the beam 16 are not changed, and no step is formed in the foundation bottom 38 (the upper surface is a certain level of foundation At the bottom 38), it is possible to make a difference in height between the upper surface of the beam 16 and the upper surface of the beam 20. Thereby, the floor level difference 50 can be formed in the floor slab 48 provided on the beam 16 and the beam 20.

  Furthermore, in the building foundation structure 12 of the present embodiment, as shown in FIG. 1, the footing 14 and the footing 18 of the same thickness, and the beam 16 and the beam 20 having the same beam form The floor level difference 50 can be formed on the floor slab 48 provided on the

  Moreover, in the construction method of the building foundation structure of the present embodiment, as shown in FIGS. 3A to 3C, simultaneously with the construction of Section 0 of the building 10, in the middle of the construction of Section 0 of the building 10. Alternatively, construction of the footing 14 can be performed after the construction of the section 0 of the building 10 is completed. Also, for example, in the case where the footing is formed of concrete as in the present embodiment, it is possible to construct the section 0 section of the building without waiting for the hardening of the concrete. That is, the construction of Section 0 of the building can be performed without being greatly influenced by the construction of the footing. By these, construction efficiency of a building can be improved.

  The embodiments of the present invention have been described above.

  In the present embodiment, as shown in FIG. 2, the head-mounted stud 44 as a force transmission means is attached to the lower part of the web 42 of the beam 16. However, the head-mounted stud 44 is embedded in the footing 14. It may be attached to the lower portion or the lower flange 56 of the web 42 of the beam 16 as described. For example, as shown in the front view of FIG. 4, a headed stud 44 may be attached to the upper surface of the lower flange 56 of the beam 16 made of H-section steel, or as shown in the front view of FIG. Headed studs 44 may be attached to the lower surface of the lower flange 56 of the beam 16.

  The force transmitting means may be any means capable of transmitting the vertical force acting on the beam 16 to the footing 14. For example, as shown in the front view of FIG. 6, a bearing plate 58 attached to the web 42 of the H-shaped steel beam 16 and brought into contact with the upper surface of the footing 14 may be used as the force transmitting means.

  When the force transmitting means is the head stud 44 shown in FIG. 4 or the bearing plate 58 shown in FIG. 6, the vertical force transmitted from the beam 16 to the footing 14 by the head stud 44 or the bearing plate 58 is the beam 16 in the footing 14. Is mainly transmitted to the upper part of the lower end surface. Therefore, much of the vertical force acting on the beam 16 can be transferred from the lower end face of the beam 16 to the footing 14, and from the beam 16 to the footing 14 by the headed stud 44 and the bearing plate 58. Thus, it is possible to bear in a wide range of the footing 14 and thereby to suppress a reduction in the vertical support force of the footing 14 due to the beam 16 being embedded in the footing 14. For example, the vertical support performance substantially equivalent to the case where the beam 16 is placed on the upper surface of the footing 14 can be exerted on the footing 14.

  Furthermore, in the present embodiment, as shown in FIG. 1, the beam 20 is placed on the upper surface of the footing 18 and the lower end of the beam 16 is embedded in the footing 14 to obtain the upper surface of the beam 20 and the upper surface of the beam 16 In this example, the lower end of the beam 16 is embedded in the footing 14 and the lower end of the beam 20 is embedded in the footing 18 so that the height between the upper surface of the beam 16 and the upper surface of the beam 20 is different. May be different. In this case, the beam 20 is provided with force transmitting means such as the head stud 44 and the bearing plate 58. When the lower end portion of the beam 16 is embedded in the footing 14 and the lower end portion of the beam 20 is embedded in the footing 18, either the upper surface of the beam 16 or the upper surface of the beam 20 may be higher.

  Further, in the present embodiment, as shown in FIG. 1, the beam 20 is placed on the upper surface of the footing 18 and the lower end of the beam 16 is embedded in the footing 14 so that the upper surface of the beam 20 and the upper surface of the beam 16 An example is shown in which the floor level difference 50 is formed in the floor slab 48 by making the height of the floor different, but as shown in the front view of FIG. 7 and the front view of FIG. The floor level difference 50 is formed in the floor slab 48 by making the heights of the upper surfaces of the beam 64 and the beam 66 which are H-shaped steels which are provided substantially horizontally and which are configured to be substantially horizontally extend. You may do so. Here, the lower end of the right end of the beam 64 as the first foundation beam is embedded in the footing 14, the lower end of the left end of the beam 64 is embedded in the footing 18, and the beam 66 is arranged floating from the footings 14, 18. , And the heights of the upper surfaces of the beams 64 and 66 are made different. Further, by providing a steel floor support receiving member 68 on the beam 64, the position at which the floor level difference 50 is formed is adjusted.

  Furthermore, in the present embodiment, as shown in FIG. 1, the footing 14 and the footing 18 have the same thickness, but the thicknesses of the footing 14 and the footing 18 may be different.

  Moreover, in this embodiment, as shown in FIG. 1, the example in which the beams 16 and 20 were respectively supported by the footings 14 and 18 that constitute the independent footing foundation was shown, but the building foundation structure of the present embodiment and the buildings The construction method of the foundation structure can also be applied to a cloth foundation in which the footing 14 and the footing 18 are integrated.

  Furthermore, in the present embodiment, as shown in FIG. 1, an example is shown in which the beam formation of the beam 16 and the beam 20, the beam end member 22 and the beam member 24, and the beam end member 26 and the beam member 28 are equal. The beam configurations of the beam 16 and the beam 20, the beam end member 22 and the beam member 24, and the beam end member 26 and the beam member 28 may be different.

  Moreover, in this embodiment, as shown in FIG. 1, although the example which made the beams 16 and 20 the H-shaped steel beam was shown, the beams 16 and 20 should just be beams made of steel. For example, the beams 16 and 20 may be beams made of shaped steel other than H-shaped steel.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments in any way, and it goes without saying that the present invention can be practiced in various aspects without departing from the scope of the present invention.

12, 72 Building Foundation Structure 14 Footing (1st Footing Section)
16, 64 beam (1st foundation beam)
18 footing (2nd footing part)
20 Beam (2nd foundation beam)
38 Foundation bottom 44 headed studs (force transfer means)
54 Jack (supporting member)
58 Bearing plate (force transmission means)
U concrete

Claims (2)

A first footing portion provided on the bottom of the foundation;
A first foundation beam made of steel having a lower portion embedded in the first footing portion and supported by the first footing portion;
Force transmitting means provided on the first foundation beam for transmitting a vertical force acting on the first foundation beam to the first footing portion ;
A second footing portion provided on the foundation bottom and having the same thickness as the first footing portion;
The first foundation beam and the beam structure are equal, and the first foundation beam is placed on the upper surface of the second footing section, or the first foundation beam has a depth different from the embedding depth of the first foundation beam in the first footing section. (2) A second foundation beam made of steel supported by the second footing section by embedding the lower portion in the second footing section, and whose upper surface has a height different from that of the upper surface of the first foundation beam,
Building foundation structure that have a. In the method of constructing a building foundation structure according to claim 1 ,
Supporting the first foundation beam by a support member installed on the foundation bottom;
Placing concrete on the bottom of the foundation and embedding the lower portion of the support member and the first foundation beam in the concrete to form the first footing portion;
How to build a building foundation structure.