JP2011247011A - Foundation construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation construction method capable of securing workability and suppressing deterioration of heat insulation properties.SOLUTION: A foundation comprises a foundation slab 10 made of steel-bar reinforced concrete, a steel foundation 2 formed on the foundation 10, and a foundation heat insulating material 40 that encloses the steel foundation 2. The foundation heat insulating material 40 comprises a slab insulating part 43 having a height slightly higher than the foundation slab 10 and a steel insulating part 44 that is connected with the slab insulating part 43 for covering an outer side of the steel foundation 2. A method for constructing the foundation comprises the steps of arranging bars of the foundation slab 10, assembling the steel foundation 2 above a position corresponding to the upper surface of the foundation slab 10, erecting the slab insulating part 43 to enclose the steel bars of the foundation slab 10 before or after assembling the steel foundation 2, placing concrete at least up to a vicinity of the upper end of the slab insulating part 43 to form the foundation slab 10, and then placing the steel insulating part 44 on the slab insulating part 43 so as to erect along the steel foundation 2.

Description

  The present invention relates to a foundation construction method for supporting an upper structure of a building such as a house.

  Cloth foundations with reinforced concrete foundation beams are known as foundations to support the superstructure of buildings. However, such cloth foundations require time and labor for construction work such as groundwork, reinforcement, formwork and anchor sets. Therefore, there is a demand from the field to improve the labor required for these. In order to meet such a demand, a structure using a steel frame as a foundation beam is known. For example, Patent Document 1 discloses a foundation structure in which a lower portion of an H-shaped steel is embedded in a foundation slab to use the H-shaped steel as a foundation beam. Is disclosed. Alternatively, Patent Literature 2 discloses a foundation structure in which H-shaped steel is fixed to a foundation slab via an anchor member. Moreover, in these foundation structures, it is necessary to consider the corrosion of the H-shaped steel caused by exposure to wind and rain, and as a countermeasure, a decorative cover is provided on the outer surface of the H-shaped steel.

  By the way, in order to give the thermal performance according to the room to the space under the first floor surrounded by the foundation structure, a structure in which the thermal insulation performance is given to the cloth foundation made of reinforced concrete is known. Application to a foundation structure equipped with

JP 2001-262586 A Japanese Patent Laid-Open No. 2003-268782 JP 2004-107974 A

  Although it is possible to start up the heat insulating material of patent document 3 from the side surface of the foundation slab below the steel material foundation of patent document 1 or patent document 2, in such a configuration, if the heat insulating material is started before the foundation slab is placed, In order to prevent the movement and swinging of the heat insulating material due to the load from the concrete placed in the concrete, the formwork needs to have the same level of resistance as the heat insulating material. There was a problem that the height of the frame was excessive. Not only that, when assembling the steel foundation before and after the concrete placement, not only these heat insulating materials and formwork get in the way of assembling the steel foundation, but the steel foundation hits the heat insulating material, As a result, there is a problem that the heat insulating material is damaged as early as in the construction stage. In addition, in the construction procedure of placing the concrete of the foundation slab and attaching the heat insulating material after assembling the steel foundation, a gap is generated between the heat insulating material and the foundation slab, and the heat insulation performance deteriorates due to the gap. There's a problem.

  This invention is made | formed in order to solve such a problem, and it aims at providing the construction method of the foundation which can suppress deterioration of heat insulation performance, ensuring workability | operativity.

(1) In order to solve the above problems, the specific configuration of the present invention is as follows.
A reinforced concrete foundation slab, a steel foundation formed on the foundation slab, and a foundation insulation body surrounding the steel foundation,
The foundation insulation is a foundation construction method comprising a slab insulation part slightly taller than the foundation slab and a steel insulation part connected to the slab insulation part and covering the outer surface of the steel foundation. And
After the reinforcement of the foundation slab, the steel material foundation is assembled upward from a position corresponding to the upper surface of the foundation slab, and the reinforcement of the foundation slab is surrounded before or after the steel foundation is assembled. Erected,
Concrete is cast to the vicinity of the upper end of the slab heat insulating part to form a foundation slab, and then
The steel material heat insulating portion is attached to the outer surface of the steel material foundation while being in contact with the slab heat insulating portion.
According to this, a slab heat insulation part can be installed before concrete placement of a foundation slab, and the gap between a foundation slab and a slab heat insulation part can be eliminated, and these can be stuck. Moreover, since the said slab heat insulation part is formed slightly taller than the foundation slab placement height, the formwork at the time of foundation slab placement may be as high as the slab insulation part. it can. For this reason, the workability of the foundation slab can be improved without hindering the movement of the worker who is working and the movement of other members and tools.

  Moreover, since a steel material heat insulation part can be attached at the appropriate timing after assembling a steel material foundation after completion of construction of a foundation slab, the said steel material heat insulation part does not become the hindrance of construction about a steel material foundation. Further, according to the above construction method, the steel heat insulation part is not left in a standing state prior to the assembling of the steel material foundation, so that the steel heat insulation part collides with other members, tools and workers under construction. In addition to preventing damage caused by the above, it is possible to suppress as much as possible the state in which the steel heat insulating part is exposed to ultraviolet rays from sunlight, so that deterioration of the steel heat insulating part due to the ultraviolet irradiation is significantly reduced or prevented. be able to.

(2) In view of this point, other specific configurations of the present invention are:
A reinforced concrete foundation slab, a steel foundation formed on the foundation slab, and a foundation insulation body surrounding the steel foundation,
The foundation insulation is a foundation construction method comprising a slab insulation part slightly taller than the foundation slab and a steel insulation part connected to the slab insulation part and covering the outer surface of the steel foundation. And
After the reinforcement of the foundation slab, surround the reinforcement of the foundation slab and set up a slab insulation part,
Concrete is cast to the vicinity of the upper end of the slab heat insulating part to form a foundation slab,
After the foundation slab is formed, the steel foundation is assembled on the upper surface of the foundation slab, and then
The steel material heat insulating portion is installed on the outer surface of the steel material base while being in contact with the slab heat insulating portion.
Thus, by installing the steel foundation after the steel foundation is assembled, the steel foundation covers the outer surface of the steel foundation, while the steel foundation rises up against the back surface of the steel foundation. The back surface can be hidden behind the steel base, whereby at least the exposure of the inner surface of the steel base is reduced as much as possible, and the ultraviolet deterioration of the inner surface is suppressed.

(3) Moreover, the said steel material heat insulation part is a flat heat insulation part which has a thickness equal to the space | interval between the finish heat insulation part mounted on the said slab heat insulation part, this finish heat insulation part, and the said steel material foundation. And
The installation of the steel insulation part is
The base heat insulating part is erected between the steel base and the slab heat insulating part, and then
It is preferable that the finish heat insulating part is placed on the upper end part of the slab heat insulating part in a state of leaning on the base heat insulating part.
According to this, the finish heat insulating part can be easily positioned by simultaneously contacting the base heat insulating part and the slab heat insulating part, and these heat insulating members can be installed very easily. Yes.

(4) Moreover, the space | interval between the said slab heat insulation part and a steel material foundation is equal to the space | interval between the said finishing heat insulation part and the said steel material foundation,
It is preferable that the said foundation | substrate heat insulation part is erected between these in the state inserted by the upper end part of the said slab heat insulation part, and the said steel material foundation.
According to this, the lower end portion of the base heat insulating portion can be fitted between the steel base and the slab heat insulating portion, the base heat insulating portion can be easily raised along the steel base, and the base heat insulating portion is prepared for installation. Thus, the workability can be further improved.

(5) Moreover, the said steel material heat insulation part has the length equivalent to the space | interval between the finish heat insulation part mounted on the said slab heat insulation part, this finishing heat insulation part, and the said steel material foundation, and the said finish heat insulation part A block-like spacer protruding on the back surface of
In the installation of the steel heat insulating part, it is preferable that the finish heat insulating material is positioned by bringing the tip of the spacer into contact with the steel base.
According to this, since the distance from the steel foundation of the finished heat insulation part is accurately maintained simply by placing the spacer against the steel foundation, the lower end part of the finished insulation part is slab slid by placing the spacer against the steel foundation. Not only can it be made to oppose the upper end part of a heat insulation part, but a finishing heat insulation part can be supported on a steel base through the said spacer.

  According to the foundation construction method of the present invention, it is possible to suppress deterioration of heat insulation performance while ensuring workability.

It is sectional drawing which shows 1st Embodiment of the foundation formed with the construction method of the foundation concerning this invention. It is a top view which shows the structural example of the beam of the part in which the horizontal brace was installed through the beating. It is a perspective view which shows the process of installing a beam. It is a perspective view which shows the process of installing a horizontal brace. (A)-(d) is a figure which shows the procedure which assembles a basic heat insulating body. It is a perspective view which shows the process of installing the member of a building in a beam. It is sectional drawing which shows 2nd Embodiment of the foundation formed with the construction method of the foundation concerning this invention. (A)-(d) is a figure which shows the construction procedure of the foundation of 2nd Embodiment.

  Hereinafter, the foundation formed by the foundation construction method according to the present invention and the foundation construction method will be described in detail based on the drawings.

(First embodiment)
1 to 6 show a first embodiment of the present invention. As shown in FIG. 1, the foundation structure of the present embodiment includes a foundation slab 10 formed as a reinforced concrete support, a steel foundation 2 assembled at the top of the foundation slab 10, the foundation slab 10 and the steel material. And a foundation insulator 40 that covers the foundation 2 from the outdoor side.

  Building A illustrated as an upper structure in the present embodiment is a two-story steel-frame industrialized house by a beam winning method having a 305 mm flat module. However, this is only a preferable application example, and the scope of application of the present invention is not limited thereto.

  In the building A, a pillar (hereinafter also referred to as a first-floor pillar) 50 provided on a foundation frame structure composed of a foundation slab 10 and a steel foundation 2 and standingly fixed on the steel foundation 2 (see FIG. 6). ), A second-floor beam arranged so as to connect the upper ends of the first-floor pillars 50, a second-floor pillar arranged on the second-floor beams, an R-floor large beam, and two adjacent pillars 50 Each of the members of the load-bearing elements 51 and the like installed in the plurality is selected from orthogonal reference lines (X-direction reference line, Y-direction reference line) (set to be an integral multiple of the module) ) It is arranged corresponding to the street and the basic frame is configured. Furthermore, in the building A, each floor is composed of floor panels made of ALC (Autoclaved Light-weight Concrete) supported by each floor beam, and each floor is constructed using the outer peripheral beam. An outer wall panel or an opening panel made of ALC or the like is attached to form an outer wall.

  As shown in FIG. 1, the foundation slab 10 which is a support body of this embodiment is entirely solid. In the foundation slab 10, the bar arrangement amount is calculated by regarding the range of the predetermined width corresponding to each of the above as a foundation beam capable of exhibiting proof strength against the ground reaction force (see FIGS. 3 and 4). . Of the basic slab 10, the area other than this is determined as a fixed slab with four sides receiving a ground reaction force, and the bar arrangement amount is determined.

  In this embodiment, the solid foundation type foundation slab 10 is illustrated, but is not limited to such a solid foundation type, for example, has a desired width according to the ground strength along the street. A footing type configuration can also be employed.

  In addition, the foundation slab 10 is formed with the upper end surface higher than the ground surface, and this prevents water from entering the space under the first floor of the building A that is on the indoor side of the foundation insulation 40. It becomes.

  The steel material foundation 2 includes a steel bundle 20 installed on the upper end surface of the foundation slab 10, a steel beam 30 supported by the bundle 20, and a steel horizontal brace 31 installed between the beams 30. And.

  The bundle 20 is placed on the upper surface of the foundation slab 10 and supports the beam 30. An anchor bolt 11 is embedded in the foundation slab 10 in advance, and a bundle 20 is joined and fixed to the upper end portion of the anchor bolt 11 with a nut or the like. The bundle 20 has a role of efficiently transmitting the load transmitted from the column (first floor column) 50 of the building A to the foundation slab 10 and is a first floor column standing on at least the large beam 30 (on the street). It is installed immediately below 50 and joined using a bolt hole in the lower flange of the middle part of the joint box 21 or the first-floor large beam 30 to support the first-floor large beam 30.

  Further, the bundle 20 has a lower flange 20b joined to the upper end portion of the anchor bolt 11, an upper flange 20a joined to the joint box 21, for example, and a cross section connecting these flanges 20a and 20b has a cross or cross, for example. The web 20c has a shape.

  As shown in FIG. 3, the bundle 20 is appropriately arranged on the outer peripheral portion (that is, the portion near the outer wall) and the inner peripheral portion (that is, the portion near the inside of the building A) of the building A. Among these, the bundle 20 arranged on the outer peripheral portion (outer street) has the same edge position of the upper flange 20a and the lower flange 20b on the outside of the building, and the lower flange 20b is more on the inside of the building than the upper flange 20a. It extends toward the inside of the building, and the extending-side web 20c has a shape (offset shape) formed so as to extend from the end edge of the upper flange 20a to the end edge of the lower flange 20b. In addition, at the entrance corner and the exit corner of the building A, the lower flange 20b extends from the upper flange 20a in two directions along the outer wall, and the extended web 20c extends from the edge of the upper flange 20a to the lower flange. A bundle 20 formed so as to extend toward the end edge of 20b is adopted.

  By using such an offset-shaped bundle 20, the load is distributed and transmitted to a wider range of the foundation slab 10, and a width that can be regarded as a foundation beam in structural calculation can be increased in the foundation structure. Yes.

  The beam 30 is made of, for example, an H-shaped steel (including a shaped steel called an I-shaped steel), and gusset plates 34 each having an L-shaped tip and having bolt holes formed at both ends in the longitudinal direction are joined by welding. (See FIG. 2, FIG. 3, etc.).

  It should be noted that the beam 30 is bridged not only between so-called large beams (first floor large beams) arranged on the street but also between the large beams installed to support the floor panel forming the first floor of the building A. Also included is a small beam 30 ′ (see FIG. 3). The small beam 30 'may be bridged between the large beam and another small beam 30'.

  As shown in FIG. 3, the upper flange 30a and the lower flange 30b of the beam 30 are provided with bolt holes 30d through which bolts for joining module columns are inserted at equal intervals based on the module. The bolt hole 30d is drilled so as to be located on the intersection of the plane-view reference line. In addition, bolt holes 30d through which bolts for joining other beams 30 are also inserted into the web 30c at regular intervals with a pitch based on the module. Furthermore, large diameter holes (for example, a diameter of 125 mm) 30e are formed in the web 30c of the beam 30 at predetermined intervals.

  As shown in FIGS. 2 and 3, when the ends of the beams 30 are joined together, a joint box 21 is used in this embodiment.

  The joint box 21 is configured by welding a square upper flange 21a and a lower flange 21b to upper and lower ends of a cross-shaped web 21c in plan view. When joining the beam 30 to the joint box 21, the two surfaces of the gusset plate 34 of the beam 30 are brought into contact with the two surfaces of the web 21c perpendicular to each other, and the bolt holes in the bent portion of the gusset plate 34 and the corresponding bolt holes. Bolts are inserted into the bolt holes of the joint box 21 and bolted.

  As shown in FIGS. 1 and 4, a horizontal brace (stiffener) 31 is installed on the floor construction surface of the first floor, and suppresses deformation of the beam 30 and the like during concrete placing work or the like. The horizontal brace 31 installed on the floor construction surface is a member for securing the in-plane rigidity of the first floor after the building is completed.

  In addition, as shown in FIG. 2, the horizontal brace 31 is attached near the upper end of the beam 30 via a fire hitting 35, thereby preventing the deformation of the beam 30 and the like, workability at the time of foundation formation, under the floor. Usability can be further improved.

  In addition to the horizontal brace 31 exemplified here, it is also possible to use a fire beam (fired base, fired metal) or the like as a stiffener.

  As shown in FIG. 6, the pillar 50 is disposed at the intersection of the street and the reference line perpendicular to the street, and the lower end portion is joined using the bolt hole 30 d of the upper flange 30 a of the middle portion of the joint box 21 or the large beam 30. The

  Further, the strength element 51 is bolted to the inner side surfaces of the two columns 50 arranged at a predetermined interval (for example, 610 mm, 915 mm, etc.). The load-bearing element 51 is constituted by a brace (cross frame), for example.

  As shown in FIG. 1, the foundation heat insulator 40 is continuously provided at the lower end portion of the outer wall of the building A, and the beam 30 which is located at the edge of the foundation slab 10 and the outer peripheral portion of the steel foundation 2. And from the outside air side.

  In the case of the present embodiment, the basic heat insulating body 40 includes a heat insulating portion 41 made of a plastic heat insulating material such as an extruded polystyrene foam or phenol foam, and a protective layer 42 applied to the outer surface of the heat insulating portion 41. ing.

  The heat insulating portion 41 includes a slab heat insulating portion 43 that is taller than the foundation slab 10 and a steel heat insulating portion 44 that is connected to the slab heat insulating portion 43 and covers the outer surface of the steel material foundation 2.

  The slab heat insulating portion 43 is formed in a flat plate shape that covers the upper end portion from the lower end portion of the side surface of the basic slab 10 and has a height protruding from the upper end portion.

  The steel heat insulating part 44 includes a finish heat insulating part 45 connected to the slab heat insulating part 43 and a flat base heat insulating part 46 having a thickness equal to the distance between the finish heat insulating part 45 and the steel material base 2. Yes.

  The base heat insulating part 46 has a height from the upper surface of the foundation slab 10 to the upper end surface of the beam of the steel material foundation 2. Moreover, it has thickness equal to the space | interval from the end surface of the foundation slab 10 which will be located in the same plane as the back surface of the finishing heat insulation part 45 to the outer surface of the steel-material foundation 2. Therefore, after assembling the foundation slab 10 and the steel material foundation 2, the lower surface of the foundation heat insulating portion 46 is brought into contact with the upper surface of the foundation slab 10, and the foundation heat insulation portion 46 is merely leaned against the beam of the steel material foundation 2. While the part 46 covers the outer surface of the steel base 2, the outer surface of the base heat insulating part 46 and the side surface of the foundation slab 10 are located on the same plane. Further, the base heat insulating portion 46 is erected along the steel base 2 so that the upper end portion and the midway portion are supported in the longitudinal direction of the beam 30 by the upper and lower flanges 30 a and 30 b of the beam 30 of the steel base 2. Will be.

  In addition, when the base heat insulating portion 46 is erected along the beam 30 of the steel base 2 in this way, the back surface of the base heat insulating portion 30 is covered with the steel base 2.

  The finish heat insulating portion 45 has the same thickness as the slab heat insulating portion 43 and is placed on the upper end surface of the slab heat insulating portion 43 so that the upper end surface is at the same position as the upper flange 30a of the beam 30 of the steel foundation 2. It is formed in a flat plate shape having a height. Further, the back surface of the finish heat insulating part 45 is attached in close contact with the side surface of the base heat insulating part 46, whereby the finish heat insulating part 45 is supported by the base heat insulating part 46 over the entire surface. As a result, it is supported by the beam 30 of the steel base 2 through the base heat insulating portion 46.

  The base heat insulating part 46, the slab heat insulating part 43, and the finish heat insulating part 45 are each laid out along the longitudinal direction of the beam 30, thereby forming the heat insulating part 41 of the basic heat insulating body 40. The joint between 46 and the joint between the slab heat insulating portion 43 and the finish heat insulating portion 45 are provided at positions shifted from each other, and the outer surface of the base heat insulating portion 46 is located behind the seam of the finish heat insulating portion 45. Become. Thereby, the airtightness is improved.

  Similarly, since the slab heat insulating part 43 is provided in a state protruding to a position above the upper surface of the basic slab 10, the base heat insulating part 46 is provided at the back of the joint between the finishing heat insulating part 45 and the slab heat insulating part 43. The outer side surface is located, and the airtightness is improved even at the joint.

  The base heat insulating part 46 is fixed to the finish heat insulating part 45 by pins 47 inserted from the outside of the finish heat insulating part 45.

  The pin 47 is made of a non-metallic material such as resin. Further, the pin 47 is generally provided with a head at one end of the shaft portion, but the pin 47 alone or a head that is remarkably smaller than the shaft portion may be employed. . As a result, when the pin 47 is pushed into the finish heat insulating portion 45, the pin 47 is hardly exposed on the surface of the finish heat insulating portion 45, thereby preventing the pin 47 from forming the protective layer 42. Can be avoided. In addition, the pin 47 of the present embodiment has a slightly uneven shape on the shaft portion, and thereby has a frictional resistance with the finish heat insulating portion 45 and is difficult to be pulled out.

  As a result, the base heat insulating portion 46 is connected to the finish heat insulating portion 45, and is not joined to the beam 30, but simply contacts.

  The protective layer 42 protects the surface of the heat insulating part 41 that will be exposed to the outside. In this embodiment, the slab heat insulating part 43 that is the surface of the heat insulating part 41 and the finish heat insulating part of the steel heat insulating part 44 are used. It is formed by plastering resin mortar over the entire surface of 45. Further, as the resin mortar is plastered on the outer surfaces of the slab heat insulating portion 43 and the finish heat insulating portion 45 which are the surfaces of the heat insulating portion 41, a reinforcing net or the like is provided at the joint portion between these heat insulating portions, and the waterproofness and strength are improved. It is also possible to adopt a configuration for improvement. Further, instead of the resin mortar, it is also possible to adopt a configuration in which a protective layer 42 is formed by sticking tiles, sidings, and the like as surface materials on the outer surfaces of the slab heat insulating portion 43 and the finish heat insulating portion 45.

  In addition, a metal fitting 53 that receives the lower end portion of the outer wall of the building A is attached to the upper end portion of the beam 30 in a state of protruding outward. The receiving metal object 53 reaches a position where the tip is slightly on the outdoor side with respect to the basic heat insulating body 40, and the upper part of the basic heat insulating material 40 is covered with the receiving metal object 53. Further, the tip end portion of the metal receiving piece 53 is bent downward, and the sealing material 54 is sandwiched between the tip end portion and the basic heat insulating body 40. Further, a sealing material is also interposed between the front end portion of the metal fitting 53 and the lower end portion of the outer wall.

Then, the construction procedure of the said foundation structure is demonstrated below.
As shown in FIG. 3, first, the ground is cut down (root cutting), and crushed stones 17 are spread and rolled. And a PC board is installed in the bundle position (position where the bundle 20 is installed) in the root cutting bottom. After fixing the fixing plate of the anchor bolt 11 to the PC plate, the anchor bolt 11 is fixed to the fixing plate.

  Subsequently, the reinforcing bars 12 are arranged. In this embodiment, the reinforcing bars 12 are densely arranged in a portion (a range of a predetermined width along the street) regarded as the foundation beam that receives the beam 30 of the steel foundation 2 according to the calculated arrangement amount. The

Thereafter, the bundle 20 is installed on the anchor bolt 11. First, a lower nut for temporarily supporting the bundle 20 is screwed into the anchor bolt 11, and the level (height) of the bundle 20 is adjusted. Subsequently, the anchor bolt 11 is inserted into the bolt hole of the lower flange 20b of the bundle 20, and the upper nut is further screwed to fix the bundle 20.
Subsequently, the beam 30 is placed on the bundle 20 and fixed using bolts and nuts.

  Thereafter, as shown in FIG. 4, a stiffener such as a horizontal brace 31 is attached to the first floor construction surface, and the diagonal dimension of the beam 30 is confirmed to adjust the position of the beam 30 (correction of distortion). As described above, it is preferable to install the horizontal brace 31 at a high position on the construction surface. However, if the level of the upper flange 30a of the beam 30 is exceeded, it will interfere with the laying of the floor panel forming the first floor. is necessary. For example, a procedure of adjusting the position of the beam 30 with a temporary horizontal brace and fixing it with the fire beam 30 or the like may be adopted.

  Then, as shown to Fig.5 (a), the slab heat insulation part 43 is stood up around the reinforcing bar already completed. At this time, the space | interval l between the back surface of this slab heat insulation part 43 and the reinforcing bar 12 is opened so that the cover thickness of the outermost reinforcing bar 12a can fully be ensured.

  Then, a formwork is installed in the outer side of the slab heat insulation part 43, and concrete is laid. In the present embodiment, concrete is placed in accordance with the lower end level of the bundle 20. Here, the upper end part of the slab heat insulation part 43 will protrude rather than the upper surface of the basic | foundation slab 10 (refer FIG.5 (b)). After that, the concrete is cured for several days.

  Then, as shown in FIG.5 (c), the base heat insulation part 46 is standingly arranged along the outer surface of the beam 30 of the steel-material foundation 2. As shown in FIG. Here, since the upper end portion of the slab heat insulating portion 43 protrudes from the upper surface of the foundation slab 10, the slab heat insulating portion 43 and the basic slab are disposed at the installation position of the base heat insulating portion 46 as shown in FIG. 10 and the guide part S by the steel material base 2 will be formed in a groove shape, and by fitting the lower end part of the base heat insulating part 46 to the groove shaped guide part S, the base heat insulating part 46 can be easily formed. It can be installed. Further, the outer surface of the base heat insulating portion 46 is the same as the side surface of the foundation slab 10 by leaning the base heat insulating portion 46 against the beam 30 in a state where the lower end portion of the base heat insulating portion 46 is fitted to the groove-shaped guide portion S. Or it will be located in substantially the same plane shape.

  Next, as shown in FIG. 5 (d), the steel base portion 44 is erected outside the steel base 2 while the finish heat insulating portion 45 is placed (contacted) on the slab heat insulating portion 43, and the heat insulating portion 41 is assembled. To go. At this time, the outer surface of the base heat insulating part 46 is located on the same or substantially the same plane as the end surface, and consequently the back surface of the slab heat insulating part 43, so that the finish heat insulating part 45 is placed on the upper end surface of the slab heat insulating part 43. By doing so, the said finishing heat insulation part 45 will be simultaneously supported by the base heat insulation part 46, and it becomes possible to install the finishing heat insulation part 45 stably by this. Thereafter, the pin 47 is inserted from the outer surface side of the finish heat insulating portion 45, and the base heat insulating portion 46 is fastened to the finish heat insulating portion 45. On the other hand, the finish heat insulation part 45 is merely placed on the slab heat insulation part 43, and the finish heat insulation part 45 and the slab heat insulation part 43 are not connected to each other. This facilitates the removal of the finish heat insulating portion 45 and facilitates repairs such as replacement of the finish heat insulating portion 45.

  Thereafter, a protective layer 42 is formed by plastering resin mortar on the surface of the slab heat insulating portion 43 which is the surface of the heat insulating portion 41 and the surface of the finish heat insulating portion 45 of the steel heat insulating portion 44, and the slab heat insulating portion 43 in contact with the ground is formed. Strength is given to the surface and the surface of the finish heat insulating part 45 exposed to the outside, and the joint between the heat insulating parts 43 and 45 is filled. As a result, the base heat insulator 40 is formed.

  The basic structure is completed by the above steps, and thereafter, as shown in FIG. 6, each part of the building A such as the column 50 and the load-bearing element 51 is sequentially assembled on the beam 30.

  According to the basic structure of the present embodiment, the slab heat insulating part 43 can be installed before the concrete slab 10 is placed, and the gap between the basic slab 10 and the slab heat insulating part 43 is eliminated, and these are brought into close contact with each other. It has become something that can be. Moreover, since the said slab heat insulation part 43 is formed taller than the placement height of the foundation slab 10, it is as high as the said slab insulation part 43 as a formwork at the time of foundation slab 10 placement. I can finish it. For this reason, the workability of the foundation slab 10 can be improved without hindering the movement of the worker who is working and the movement of other members and tools.

  Moreover, the steel heat insulation part 44 which forms the foundation heat insulation body 40 can be laid out by installing along the steel material foundation 2 after completion of construction of the foundation slab 10, and the foundation heat insulation body 40 The assembly is also easily performed. Since the steel material heat insulating portion 44 is assembled after the steel material foundation 2 is assembled, the steel material heat insulating portion 44 does not interfere with the construction of the steel material foundation 2.

  In addition, according to the above construction method, the steel heat insulation portion 44 is not left standing in the state of standing up prior to the assembling of the steel material foundation 2, but rises along the steel material foundation 2, so that the steel heat insulation portion 44 stands up in a stable state. Needless to say, since the steel heat insulating portion 44 is protected by the steel base 2, damage caused by the steel heat insulating portion 44 hitting other members, tools, and workers under construction is also suppressed. Further, the back surface of the base heat insulating portion 46 that is the back surface of the steel heat insulating portion 44 is protected by the steel material base 2 in this way, and the surface of the finish heat insulating portion 45 that becomes the surface of the steel heat insulating portion 44 is protected by the protective layer 42. The state in which the steel base 2 is exposed to ultraviolet rays from sunlight is suppressed as much as possible, and the deterioration of the steel heat insulating portion 44 at the construction stage due to the ultraviolet irradiation is also suppressed.

  Moreover, since the base heat insulating body 40 is itself supported by the steel base 2 and the base slab 10 over the entire surface, there is no significant difference in impact resistance depending on the part, and it is uniform against the shock. The strength is exhibited, damage such as cracking is suppressed as much as possible, and the heat insulating performance is maintained. Of course, since the heat insulating portion 41 is formed thick in this way, the heat insulating airtightness of the underfloor space is also improved.

(Second Embodiment)
The configuration of the second embodiment according to the present invention is different from the first embodiment in the configuration of the steel heat insulating portion 44 of the basic heat insulator 40 and part of the construction procedure, but the other configurations are the same as those in the first embodiment. Therefore, only different parts will be described, and the same configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment and description thereof is omitted.

  As shown in FIG. 7, the steel heat insulating portion 44 of the basic heat insulating body 40 of the present embodiment is equal to the finish heat insulating portion 45 connected to the slab heat insulating portion 43, and the interval between the finish heat insulating portion 45 and the steel base 2. A block-shaped spacer 48 having a length and protruding from the back surface of the finish heat insulating portion 45 is provided.

  The finish heat insulating portion 45 has the same thickness as the slab heat insulating portion 43 and is placed on the upper end surface of the slab heat insulating portion 43 so that the upper end surface is at the same position as the upper flange 30a of the beam 30 of the steel foundation 2. It is formed in a flat plate shape having a height.

  The spacer 48 is formed by molding the same material as the heat insulating plate 41 of the base heat insulator 40 into a block shape, and the width is substantially equal to the distance from the outdoor side surface of the web 30 c of the beam 30 to the side surface of the basic slab 10. Is formed.

  The spacer 48 is provided between the finishing heat insulating portion 45 of the steel heat insulating portion 44 and the beam 30 of the steel base 2, and the finishing heat insulating portion 45 is located at a position facing the upper end portion of the finishing heat insulating portion 45. It is being fixed to the said basic heat insulating body 40 with the pin 47 inserted from the outer side.

  As a result, the spacer 48 is connected to the finish heat insulating portion 45 of the steel heat insulating portion 44, and the protruding end portion of the spacer 48 is not joined to the web 30 c of the beam 30, but only abuts. It becomes.

Then, the construction procedure of the said foundation structure is demonstrated below.
The ground is cut down, the crushed stone 17 is laid down and rolled, the PC board is installed at the bundle position (position where the bundle 20 is installed) on the root cutting bottom, the anchor bolt 11 is fixed on the PC board, and then The process up to arranging the reinforcing bars of the foundation slab 10 is the same as in the first embodiment.

  After that, as shown in FIG. 8A, the slab heat insulating portion 43 is erected around the reinforcing bars that have already been arranged, and the mold is erected outside the slab heat insulating portion 43. And concrete is laid. In the present embodiment, concrete is placed in a state where the upper end edge of the slab heat insulating portion 43 is slightly below the upper end portion of the anchor bolt 11 (see FIG. 8B).

  Next, as shown in FIG. 8 (c), the bundle 20 is installed on the anchor bolt 11, and then the beam 30 is placed on the bundle 20, and these are fastened by bolts and nuts.

  Thereafter, a stiffener (not shown) such as a horizontal brace is attached to the first floor construction surface, and the beam 30 position is adjusted (distortion correction) by confirming the diagonal dimension of the beam 30.

  On the other hand, the spacer 48 is attached to the upper end part of the finishing heat insulation part 45 and the steel heat insulation part 44 is formed during the above procedure. In the attachment, one small edge surface of the spacer 48 is brought into contact with one side surface of the upper end portion of the finish heat insulating portion 45, and the pin 47 is inserted from the other side surface of the finish heat insulating portion 45 toward the spacer 48 in this state. . The pins 47 are inserted into a plurality of places, and thereby the spacers 48 are fixed to the finishing heat insulating portion 45.

  Thereafter, the steel base portion 44 is erected on the outside of the steel base 2 while the finishing heat insulating portion 45 is placed (contacted) on the slab heat insulating portion 43, and the heat insulating portion 41 is assembled. At this time, since the length of the spacer 48 is equivalent to the length from the side surface of the web 30c of the beam 30 to the end surface of the foundation slab 10, as shown in FIG. By installing the steel heat insulating portion 44 in the direction in which the tip of the spacer 48 is brought close to the web of the beam of the steel foundation 2, the position of the steel heat insulating portion 44 is accurately determined. In addition, the steel heat insulating portion 44 rises to the upper end portion of the slab heat insulating portion 43 while standing upright. Moreover, by installing in this way, the steel heat insulation part 44 will be supported also by the beam 30 of the steel base 2 via the spacer 48, and the starting state of the steel heat insulation part 44 is stably maintained. The

  By assembling the steel material heat insulating portion 44, the heat insulating portion 41 of the basic heat insulating body 40 is erected over the outer surfaces of the basic slab 10 and the steel material foundation 2. Thereafter, the remaining steps are the same as in the first embodiment, such as plastering resin mortar or the like on the surfaces of the steel heat insulating portion 44 and the slab heat insulating portion 43 to form the protective layer 42.

  According to this embodiment, the distance from the steel base 2 of the finishing heat insulation part 45 is correctly maintained by making the spacer 48 contact | abut to the steel base 2. FIG. In addition, by installing the lower end portion of the finish heat insulating portion 45 at the upper end portion of the slab heat insulating portion 43, the tip end portion of the spacer 48 can be brought into contact with the web of the beam of the steel base 2 and the position of the steel heat insulating portion 44 is Adjustment is almost unnecessary. Moreover, the support state of the steel material heat insulation part 44 will be formed with the said installation process. Thereby, the operator does not need to support the steel heat insulating part 44 by hand, and the work of starting the finishing heat insulating part 45 on the slab heat insulating part 43 can be performed very easily. Of course, since the steel heat insulating portion 44 is protected by the steel base 2, the steel heat insulating portion 44 is suppressed from being exposed to sunlight, and the ultraviolet deterioration during construction of the steel heat insulating portion 44 is sufficient. Will be suppressed.

  Further, as in the above-described embodiment, according to the present invention, the foundation thermal insulator 40 is configured to straddle both the foundation slab 10 and the steel foundation 2 arranged above and below, while the foundation slab 10 and the steel foundation are formed. It can be gradually assembled with the assembly of 2 and the degree of freedom of workability is improved.

The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention.
For example, after assembling the steel material foundation 2, it is also possible to adopt a configuration in which the steel material heat insulating portion 44 of the basic heat insulating body 40 is installed after the pillar 51 of the building A, the seismic element 52, the floor panel and the outer wall are installed. .

Moreover, after assembling the pillar 51 of the building 51, the seismic element 52, the receiving metal 53 of the outer wall, etc. to the steel foundation 2 in this way, it is possible to adopt a configuration in which the concrete of the foundation slab 10 is placed. Is possible.
It is also possible to adopt a configuration in which only the base heat insulating portion 46 of the steel heat insulating portion 44 is installed on the steel base 2 first, and the finishing heat insulating portion 45 is installed after the construction of the building A is completed to some extent. It is.

  Moreover, the foundation slab 10 can adopt a configuration in which only the outer portion is higher than the ground surface and the central portion is lower than the ground surface, or a configuration in which a water gradient is gently provided from the outer portion toward the ground surface. It is.

  In the above-described embodiment, the anchor bolt 11 is used as a method of fixing the bundle 20 to the foundation slab 10. However, instead of this, the bundle 20 may be fixed by an embedded nut and bolt. it can. When configured in this manner, there is no longer any restraint in the lateral direction of the bundle 20 by removing the bolts. For example, when moving or adding a pillar in accordance with an extension or reconstruction, the bundle 20 can be easily removed. it can.

2 Steel foundation 10 Foundation slab (support)
11 Anchor bolt 12 Reinforcing bar 13 Concrete 20 Bundle 30 Beam 30
31 Horizontal brace 40 Basic heat insulator 41 Heat insulating portion 42 Protective layer 43 Slab heat insulating portion 44 Steel heat insulating portion 45 Finish heat insulating portion 46 Base heat insulating portion 47 Pin 48 Spacer 46 Base heat insulating portion 50 Pillar 51 Strength element A Building

Claims (5)

A reinforced concrete foundation slab, a steel foundation formed on the foundation slab, and a foundation insulation body surrounding the steel foundation,
The foundation insulation is a foundation construction method comprising a slab insulation part slightly taller than the foundation slab and a steel insulation part connected to the slab insulation part and covering the outer surface of the steel foundation. And
After the reinforcement of the foundation slab, the steel material foundation is assembled upward from a position corresponding to the upper surface of the foundation slab, and the reinforcement of the foundation slab is surrounded before or after the steel foundation is assembled. Erected,
Concrete is cast to the vicinity of the upper end of the slab heat insulating part to form a foundation slab, and then
A foundation construction method comprising attaching the steel heat insulation portion to an outer surface of the steel material foundation while being in contact with the slab heat insulation portion. A reinforced concrete foundation slab, a steel foundation formed on the foundation slab, and a foundation insulation body surrounding the steel foundation,
The foundation insulation is a foundation construction method comprising a slab insulation part slightly taller than the foundation slab and a steel insulation part connected to the slab insulation part and covering the outer surface of the steel foundation. And
After the reinforcement of the foundation slab, surround the reinforcement of the foundation slab and set up a slab insulation part,
Concrete is cast to the vicinity of the upper end of the slab heat insulating part to form a foundation slab,
After the foundation slab is formed, the steel foundation is assembled on the upper surface of the foundation slab, and then
A foundation construction method, wherein the steel heat insulation portion is installed on an outer surface of the steel foundation while being brought into contact with the slab heat insulation portion. The steel material heat insulating portion includes a finish heat insulating portion placed on the slab heat insulating portion, and a flat base heat insulating portion having a thickness equal to a distance between the finish heat insulating portion and the steel material foundation,
The installation of the steel insulation part is
The base heat insulating part is erected between the steel base and the slab heat insulating part, and then
The foundation construction method according to claim 1 or 2, wherein the finish heat insulating portion is placed on an upper end portion of the slab heat insulating portion in a state where the finish heat insulating portion leans against the base heat insulating portion. The spacing between the slab insulation and the steel foundation is equal to the spacing between the finish insulation and the steel foundation,
The foundation construction method according to claim 3, wherein the base heat insulating portion is erected between the upper end portion of the slab heat insulating portion and the steel base in a state of being fitted between them. The steel heat insulating portion has a finish heat insulating portion placed on the slab heat insulating portion, and has a length equal to the interval between the finish heat insulating portion and the steel base, and protrudes from the back surface of the finishing heat insulating portion. Block-shaped spacers,
The foundation construction method according to claim 1 or 2, wherein the installation of the steel heat insulating portion is performed by positioning the finish heat insulating material by bringing a tip of the spacer into contact with a steel base.