JPS6062335A - Wooden column base-buried foundation - Google Patents

Abstract

PURPOSE:To meet a design reference for a wooden column base-buried foundation by a method in which specific fitting parts are fixed to underground concrete beams in grid-like trench under the ground, and a concrete layer of a downwardly facing bowl form is formed below the specific fitting parts. CONSTITUTION:A grid-like trench 4 is formed of a grid-arranged broken cobble stone layer 1 and adjacent upheaved gravel layers 3 at a given depth below the ground's surface. In the trench 4, a concrete underground beam 2 is formed at a lower level than the upper end face of the layers 3, and a column base fitting part 6 having a fixing portion 61 on its lower end and a column base insertion space 63 and the joint 66 of brace S on its upper part is fixed to the upside of the beam 2. A concrete layer 5 is also formed over the periphery exclusive of the upper end of the part 6 and the upsides of the beam 2 and the layers 3, and an air vent (not illustrated) is formed in the layer 5. The wooden structure, therefore, can meet a structural type under a design standard even when sleeper, etc., is omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a novel structure of a "wooden column base embedded foundation" developed in connection with Japanese Patent Application No. 126558/1983, which has already been filed by the applicant. It is related to.

In the already developed invention, the column base fixing members are fixed on the foundation installed at a predetermined depth below the ground surface, and each column base fixing member is connected and fixed with a connecting material, and then the stud base is fixed. By forming a concrete layer on the outside of the member, underground beams, and a dirt floor, a large number of downward-facing bowl-shaped parts are realized on the lower surface of the poured concrete layer, while the column base fixing member is firmly installed within the poured concrete layer. As a result, the wooden column inserted and erected into the column base insertion space of the column base fixing member has almost the same structural strength as if it were rigidly connected to the same foundation, and the cross section of the column is, for example, 21 ( By employing wooden columns with a large cross section of approximately Ell11 square, it became possible to realize a wooden structure that did not require any braces (pressing).

However, the design standards for wooden structures in Japan are such that as long as the framework structural members are made of wood, braces, flint foundations, flint beams, etc. must be used to conform to the predetermined structural type. Since the structure is such that a building permit is not obtained, the wooden structure invented in Japanese Patent Application No. 12655B/1987 cannot be widely provided to the world as a building that has received a building permit (however, In order to obtain a building permit, it would be a different matter to formally adopt braces, flint beams, etc. that are completely unnecessary in terms of structural strength. We are actively collecting experimental data from institutions.

The present invention is based on the technical idea of the previous invention, on the premise that it can clear the current design standards, but attempts to simplify it slightly and change the structural form to become a bottle structure. It is something.

The details of the configuration will be described below based on a typical embodiment of the invention shown in the drawings.

That is, the basic structure of the present invention is to form the split stone layer 1 in a grid-like arrangement at a predetermined depth below the ground surface, for example, about 250 tnm, and to form a unit grid of the grid formed by a portion of the split stone layer 1. G, G...
In each case, a raised gravel bed layer filter, filter, etc., which also serves as a formwork for forming the underground beam 2, is formed in a bulky manner. The above-mentioned split stone layer 1 and the adjacent raised gravel bed layer 6. A dirt floor sheet 9, for example, a synthetic resin sheet, etc., is laid in the grid groove 4 formed by B, or concrete is poured directly without laying it, and the height is lower than the upper end surface of the gravel bed layer 6. Approximately 3QQ from the top of layer 1
The underground beam 2 is formed at a height of approximately s+a and approximately 80 to 100 feet below the upper end surface of the raised gravel bed layer 6.

When forming the underground beam 2 by pouring concrete, anchor bolts 7.7...
In addition to installing a predetermined number of anchor bolts 7, etc., in preparation for fixing and arranging column base fixing members 6, 6, etc., which will be described later, if necessary, these anchor bolts 7. 7.
. . . reinforcing bars 21° 21 . . . which serve both as positioning members and reinforcement members for the underground beam 2 are arranged in advance. 22 in the figure is level distortion correct mortar.

On the upper surface of the underground beam 2 formed lower than the raised gravel bed layer 6, anchor bolts 7.
7... The column base fixing member 6 is arranged and fixed. The column base fixing member part 61 has a structure in which the upper part is formed between the column base insertion space 6 and the press joint part 66, and as shown in the embodiment, the fixing part 61 is made of, for example, a flat steel plate or other strong material. Anchor bolt 7 on a certain plate
A cylindrical steel member with a hollow portion corresponding to the cross section of the column base is erected on the top surface of the insertion opening 6'2, 6'2..., and integrated into the column base for insertion. Try to realize six spaces. Near the upper end of the cylindrical steel material and other members constituting this column base insertion space 66, a column base connecting portion 64 for inserting and fixing the wooden column base C, for example, a bolt hole for inserting a fixing bolt, is provided. A wooden column pedestal C is formed and inserted into the column pedestal fixing part A 96 through the fixing bolt 65.
will be connected and fixed to the foundation.

On the other hand, the press joint 66 formed at the upper end of the column pedestal fixing member B is integrally attached to the outside near the upper end of the column pedestal fixing member B, as in the embodiment shown in the fourth layer. In addition to this, the fixed bolt shown as one embodiment of the column base connecting portion 64 described above is also possible. In the figure, S indicates a press.

Incidentally, the column base insertion space 66 of the column base fixing member 6 is realized not only by the cylindrical steel material shown above, but also by welding four flat steel plates bent into an L shape, although not shown in the flat diagram. It is possible to adopt a hollow cylindrical shape, a hollow cylindrical shape, or any other structure that can realize a hollow cross section.

After the column base fixing member 6 is fixed to the upper surface of the underground beam 2 in this way, the column base fixing member 6 is cast over the outer periphery except for the upper end of the column base fixing member B, the upper surface of the underground beam 2, and the upper surface of the raised gravel bed layer 3. After forming the concrete layer 5 and leveling its upper surface, if necessary, apply a mortar finish (not shown) and directly install tumble joists (not shown) to finish the flooring. Alternatively, as in the illustrated embodiment, it can be used directly as a concrete floor surface. Therefore, it becomes possible to omit not only the foundation but also most of the structural members such as flint foundations, bundling, roots, and daihiki that could not be omitted with conventional floor assembly structural members. In the figure, 53 indicates reinforcing reinforcing bars or lath materials.

In this way, since the joists are placed directly on the top surface of the poured concrete layer 5, a waterproof structure is installed within the poured concrete layer 5 in order to prevent the influence of moisture from the poured concrete layer 5. Alternatively, a ventilation opening 8 may be formed as in the illustrated embodiment.

This ventilation port 8 is formed, for example, as follows. In other words, a concrete surface 51 is formed which is one step lower than the surface of the cast concrete layer 51 located at the outermost side in the splitting. By forming an inclined groove or a cutout groove reaching the top surface and installing a grille 81, it is possible to realize a simple ventilation opening 8 as shown in FIG. 5. However, it is possible to realize a more complete ventilation opening 8. If so, if a lattice-shaped groove 82 is formed on the top surface of the poured concrete layer 5 so that the ventilation holes 8, 8... are connected, the joists can be arranged. Ventilation is also reliably ensured in areas where there is a risk of the structure becoming closed due to the construction of the concrete, and the influence of moisture from the 8 surfaces of the poured concrete layer can be almost completely eliminated.

The column-base embedded foundation of the present invention formed as described above has the following structural features: (1) It has an anchorage part in the middle of the underground beam, and is somewhat shallow in terms of concrete embedment depth. Although this is a column base fixing member, it is used in combination with a press to ensure that the column base of the wooden column is embedded and fixed in the poured concrete layer, so it is not as resistant to external forces, especially earthquakes, as it was before. The foundation and superstructure were separated and destroyed.1. Although it is a simple structure in which the foundation plate is omitted and underground beams are formed directly on the cracked stones, the foundation structure as a whole is shaped like a single plate. In addition to being sturdy, almost like a solid foundation, many downward facing bowl-shaped parts are formed on the lower surface, making it a foundation structure that is extremely resistant to crustal deformation during earthquakes, especially quicksand phenomena. Thick underground beams arranged in a grid pattern run between each pillar base reinforced by the pillars, completely preventing individual horizontal movement and uneven settlement of the wooden pillars. Even though it is possible to omit all so-called floor assembly structural members such as flint foundations, bundles, and root girders, an extremely sturdy undercarriage structure can be realized in terms of structural strength. ■Columns, beams, girders, etc. By adopting large cross-section members, for example around 210fil and 11 squares, as frame structural materials, members such as studs can be omitted, reducing the amount of wood used as a whole, and making it much easier to process and assemble. ■The frame structure is completely isolated from the ground, completely preventing damage from pests such as termites, and preventing moisture from spreading from the ground, effectively preventing corrosion and deterioration. be able to.

In addition, in terms of construction, the following work can proceed simply by digging the entire contour according to the planar shape of the building at once using a backhoe or other machine, eliminating the need for complex shaping work as in the past. , construction efficiency is greatly improved; ■ By adopting a raised gravel bed layer, most of the formwork for foundation work can be omitted, reducing the cost of consumables such as formwork and separators. Not only is it no longer necessary, but the labor of assembling and disassembling formwork is saved, which saves on various work costs and shortens the construction period. Unlike conventional techniques, it is possible to reliably form a layer of poured concrete with extremely simple work; ■The amount of concrete poured may be slightly larger than that using conventional technology; The increase in the raw material cost of the concrete used is more than compensated for by the reduction in costs, etc., and the surface of the poured concrete can be used as a flat work surface after the specified curing period has passed, and the framework structure The construction of the column can be carried out efficiently and safely (allowing the entry of crane trucks, etc.), The construction work can be done quickly and safely because it can stand on its own temporarily (however, there is no risk of it falling over and is completely safe). Therefore, by predetermining the column division into a fixed grid, the frame structural members or the members attached thereto can be unitized into beam units or column units, or in some cases, into three-dimensional grid units. It is extremely easy to create a prefabricated architectural style.

In terms of other functions, the Nige gravel bed layer is thickly raised as a formwork for forming underground beams and forming many downward bowl-shaped parts under the poured concrete layer. In addition to increasing the strength of the floor within the grid surrounded by beams, the synergistic work with the gravel and the air layer in the gaps improves the heat retention function of the same area, making it possible to use a floor heating and cooling system. It has a number of features that could not be achieved with the basic structure of wooden buildings, such as cloth foundations or cloth foundations combined with independent foundations. This, along with the inventions that have already been filed, must be highly evaluated as a basic structure for increasing the structural strength of wooden buildings and reducing construction costs.

[Brief explanation of the drawing]

The drawings show one of the typical embodiments of the present invention, and FIG. 1 is a basic plan view showing the entire structure, and FIG. 2 is a cross-sectional view taken along line A-A in FIG. An enlarged sectional view, FIG. 6 is a perspective view of the column base fixing member, FIG. 4 is a perspective view showing another embodiment of the column base fixing member, and FIG. 5 is a cross section taken from B to B in FIG. FIG. 6 is a basic plan view showing another embodiment of the ventilation port. 1... Split stone layer, 2... Underground beam, 6... Raised gravel l; IF! , A..., Gerrid Encounter, et al. 00. Placed concrete layer, 6... Column base fixing member, C... - Wooden column base, G... Grid, S... Press. Procedural amendment (method) February 24, 1980 1, Indication of the case 1988 Patent TH Kei No. 171977 2, Title of the invention Wooden column foot embedded foundation 3, Relationship with the person making the amendment Patent application Person 4, Agent (1) Change the name of the invention in the specification to “wooden column foot embedded foundation”
Correct to.

Claims (1)

[Scope of Claims] 1. A layer of split stone laid in a grid-like arrangement at a predetermined depth below the ground surface, and a bulky, underground beam-forming formwork within the unit grid surrounded by the portion where the layer of split stone is laid. A cast concrete underground beam lower than the upper end surface of the raised gravel bed layer is formed in the grid-like groove formed by the raised gravel bed layer. The column pedestal fixing member formed in the wooden column pedestal insertion space and the press joint is fixed and arranged, and the outside of the column pedestal fixing member except for the upper end,
and a wooden column-base embedded foundation in which a cast concrete layer having a predetermined thickness and a number of downward bowl-shaped portions is formed over the top surface of underground beams and the top surface of a raised gravel bed layer. 2. The column base fixing member includes a flat steel plate for anchoring onto the underground beam, a cylindrical steel member that is erected and integrated on the flat steel plate for anchorage, and has a column base connecting portion and a press joint at the upper end. A wooden pedestal embedded foundation according to claim 1, which is formed by: 3. A patent claim in which a concrete casting surface is formed on the outer side of the column base fixing member located at the outermost position, which is one step lower than the top surface of the poured concrete layer, and a ventilation opening is formed using the stepped portion between the two. A wooden column base embedded foundation according to items 1 and 2. 4. A ventilation groove is formed on the upper surface of the inner cast concrete layer of the outermost column base fixing member, and each ventilation opening is made continuous by the ventilation groove. Embedded wooden column foundation.