JP2010156178A - Foundation structure and foundation construction method for large-scale temporary structure such as temporary roof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation structure and a foundation construction method for a large-scale temporary structure such as a temporary roof suitably executable in a site where excavation is impeded or limited due to the presence of historic remains, historically important cultural properties or the like, and allowing demolition and removal work to be efficiently performed when removing the large-scale temporary structure. <P>SOLUTION: An earthen floor slab 2 and a column base support block 3 supporting a column base 10a of the temporary structure are integrally constructed of cast-in-place concrete on the ground 11, and a plurality of precast concrete blocks 4 for weights are installed at both sides of the column base support block 3. The column base support block 3 and the precast concrete blocks 4 for the weights are strained by a PC steel member 5 penetrating horizontally in common and formed as an integral structure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention belongs to the technical field of the foundation structure and foundation construction method of large-scale temporary structures such as bare roofs, and more specifically, a site where historic sites and historically important cultural properties are built and cannot be excavated, Or it is related with the gravity-type foundation structure which can be implemented suitably for the site where excavation is restricted, and can perform a disassembly and removal operation | work efficiently when removing the said temporary structure.

  When building a large-scale temporary structure such as a bare roof on a site where historic sites and historically important cultural properties cannot be excavated, or where excavation is restricted, the foundation of the temporary structure is Since it cannot be constructed by placing or excavating piles on the ground, it is common practice to construct a concrete foundation on the ground. Such a concrete foundation is inevitably large-scale, and is usually constructed by placing concrete on site (see, for example, Non-Patent Document 1).

  However, since the concrete foundation is large-scale, there is a problem that considerable labor and time are required for dismantling and removal work. In addition, most of the removed concrete foundation cannot be diverted, and there is an environmental problem that a large amount of industrial waste is produced. Furthermore, in addition to the noise problem during the concrete work, there is a fatal problem that the ground (site) may be damaged by vibration during the work.

  By the way, in recent years, various inventions related to a basic structure that can be easily removed and can be diverted are disclosed, assuming that they are removed in advance (see, for example, Patent Documents 1 and 2). .

As shown in FIGS. 1 to 3 of Patent Document 1, Patent Document 1 superposes rectangular (rectangular) shaped plates 8a to 8d in a cross-beam shape, and superimposes the superposed shaped plates 8a to 8d in the vertical direction. An invention relating to a basic structure of a multi-story parking apparatus is disclosed in which a plurality of bolts 9 that are penetrated are fastened with nuts to form an integrated base unit 7 side by side.
According to the present invention, the molded plates 8a to 8d can be easily removed by releasing the fastening state between the bolt 9 and the nut. Moreover, it can also be diverted.

As shown in FIGS. 1 and 2 of Patent Document 2, Patent Document 2 is a tower formed by stacking a plurality of rectangular precast concrete slabs 2 in a cross-girder shape and integrating a plurality of anchor bolts 4 therethrough. An invention related to a crane foundation is disclosed.
According to the present invention, the precast concrete slab 2 piled up in the form of a cross beam can be lifted and carried out as it is by a mobile crane or the like, so that it can be easily removed. Moreover, it can also be diverted.

Japanese Utility Model Publication No. 5-89726 Japanese Utility Model Publication No. 7-35540 “Foundation concrete (March)” by Suo Kokubunji Photography (http: // www5.ocn.ne.jp/~suoukoku/phpto04.html)

  The inventions according to Patent Documents 1 and 2 relate to the foundation structure for a multi-story parking device and a tower crane, both of which are intended for a small-scale foundation structure, and for the foundation structure of a large-scale temporary structure such as a bare roof. Is not applicable at all.

  The object of the present invention can be suitably applied to sites where historic sites and historically important cultural properties are built and cannot be excavated, or sites where excavation is restricted, and when removing large-scale temporary structures. The purpose is to provide a foundation structure and foundation construction method for large-scale temporary structures such as bare roofs that can efficiently perform dismantling and removal work.

  As means for solving the problems of the background art described above, the invention described in claim 1 is a basic structure of a large-scale temporary structure such as a bare roof, and a ground slab on the ground, and the temporary structure. A column base support block that supports the column base is integrally constructed with cast-in-place concrete, and a plurality of precast concrete blocks for weight are installed on both sides of the column base support block. The precast concrete block for laying is characterized by being made into an integral structure by being tensioned by a PC steel material penetrated in common in the horizontal direction.

  According to a second aspect of the present invention, in the basic structure of a large-scale temporary structure such as a bare roof according to the first aspect, a sand layer is formed on the ground, and the soil slab and the column base support are formed on the sand layer. It is characterized in that the block is constructed integrally with cast-in-place concrete.

  According to a third aspect of the present invention, in the basic structure of a large-scale temporary structure such as a bare roof according to the first or second aspect, a steel column that constitutes the temporary structure on the upper surface of the column base support block. The column base is placed, and a base plate provided at the lower end of the column base is fixed with an anchor bolt.

  According to a fourth aspect of the present invention, in the basic structure of a large-scale temporary structure such as a bare roof according to any one of the first to third aspects, the precast concrete block for the weight has a bottom slab. It is characterized in that it is fixed to the soil slab by passing through anchor bolts that are fixed vertically and vertically.

The invention described in claim 5 is a basic structure of a large-scale temporary structure such as a bare roof, wherein a plurality of precast concrete blocks for weight are installed side by side on the ground, and the precast concrete block for weight is , It is tensioned with the PC steel material penetrated in the horizontal direction and is made into an integral structure,
The column base of the temporary structure is placed on the upper surface of any one of the precast concrete blocks for weight, and a base plate provided at the lower end of the column base is fixed with an anchor bolt. And

  The invention described in claim 6 is a foundation construction method for a large-scale temporary structure such as a bare roof. On the ground, a soil slab and a column base support block that supports the column base of the temporary structure are provided. It is built in cast-in-place concrete, and multiple precast concrete blocks for weight are installed on both sides of the column base support block. The column base support block and the precast concrete block for weight are common in the horizontal direction. It is characterized by being made into an integral structure by being strained by a PC steel material penetrated through the steel plate.

The foundation structure and foundation construction method of a large-scale temporary structure such as a bare roof according to the present invention have the following effects.
1) Since the foundation structure can be constructed without excavating the ground at all, it can be suitably carried out on sites where historic sites and historically important cultural properties are built and cannot be excavated, or on sites where excavation is restricted.
2) Since the lower end of the foundation structure is a soil slab, the weight of the soil slab and the frictional force between the soil slab and the ground effectively act on the stability of the foundation structure, making the foundation structure rational and economical. Can be built.
3) Since the precast concrete block for weight is implemented in a size that can be sufficiently transported, it is convenient to carry, can be diverted, and does not become industrial waste. Moreover, it can respond by increasing / decreasing suitably according to the magnitude | size of the tensile resistance force requested | required of the foundation structure to construct | assemble, and is excellent in flexibility.
4) When dismantling / removing the foundation structure (temporary structure), the precast concrete block for weight that can be transported can be easily removed simply by releasing the tension state of the PC steel bar (PC steel material). Is excellent. In addition, dismantling / removal work can be done with almost no concrete pouring work, so noise problems during concrete pouring work can be solved, and the ground (site) can be damaged by vibration during the pouring work. Nor.
5) When a sand layer is formed on the ground and a soil slab is constructed on the sand layer, the soil slab can be removed easily (see Example 1 above).
6) When the column base of the column is mounted on the top surface of the column base support block, the foundation structure can be disassembled and removed more efficiently, and industrial waste can be further reduced. (See Example 2).
7) When the precast concrete block for weight is fixed to the soil slab with L-shaped anchor bolts, the tensile resistance of the foundation structure can be further improved (see Example 3).
8) When all the main parts of the foundation structure are constructed with precast concrete blocks for weighting, the foundation structure can be disassembled and removed more efficiently (see Example 4).

It is the elevation which showed roughly the whole structure of the bare roof (large-scale temporary structure) which covers the building A. A is an elevation view specifically showing a basic structure of a large-scale temporary structure according to the first embodiment, and B is a plan view thereof. A is an elevation view specifically showing a basic structure of a large-scale temporary structure according to the second embodiment, and B is a plan view thereof. A is an elevational view specifically showing the basic structure of a large-scale temporary structure according to Example 3, and B is a plan view thereof. A is an elevational view specifically showing a basic structure of a large-scale temporary structure according to Example 4, and B is a plan view thereof.

The present invention mainly provides a foundation structure for supporting a large-scale temporary structure such as a bare roof on a site where a historic site or historically important cultural property is built and cannot be excavated or a site where excavation is restricted Is an invention suitable for construction without excavation or pile driving. Furthermore, when removing the large-scale temporary structure, the invention is suitable for efficiently dismantling / removing the foundation structure.
Embodiments of a foundation structure and foundation construction method for a large-scale temporary structure such as a bare roof according to the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the entire structure of a bare roof (large-scale temporary structure) 10 covering a historically important building A such as a temple, shrine, and temple. FIG. 2 shows the foundation of the bare roof 10. Structure 1 is shown specifically.
In the basic structure 1 of the bare roof 10 according to the first embodiment, the soil slab 2 and the column base support block 3 that supports the column base portion 10a of the bare roof 10 are integrally formed on the ground 11 with cast-in-place concrete. A plurality of precast concrete blocks 4 for weight are installed on both sides of the column base support block 3, and the column base support block 3 and the precast concrete block 4 for weight are penetrated in common in the horizontal direction. The PC steel material 5 is tensioned to form an integral structure.

  The size and shape of the foundation structure 1 according to the present invention are appropriately changed in design according to the scale and shape of the bare roof 10 and eventually the building A. Incidentally, in the foundation structure 1 according to the first embodiment, the column bases 10a of a plurality of columns (steel columns) supporting the bare roof 10 that sufficiently covers the building A (substantially equal to the direction perpendicular to the paper surface of FIG. 1). (Arranged at intervals) is carried out in the form of being individually supported by the column base support block 3.

  As an example, the soil slab 2 is constructed of D13- @ 200 double cast-in-place concrete. The soil slab 2 according to the present embodiment is formed in a square shape as shown in FIG. 2 and is intermittently provided in the vertical direction on the paper surface of FIG. 1 according to the number of the columns. However, the present invention is not limited to this. It is also possible to carry out by integrally providing a large vast soil slab 2 which is common to a plurality of support columns supporting the bare roof 10 in the direction perpendicular to the paper surface of FIG. Incidentally, the soil slab 2 according to the illustrated example is about 500 × 500 cm in length and width and about 25 cm in height.

The column base support block 3 is constructed of cast-in-place concrete in the same manner as the soil slab. The column base support block 3 according to the present embodiment has a column base portion 10a of a support column installed on the upper surface of the constructed soil slab 2, and the column base portion 10a is fixed to the soil slab 2 with anchor bolts 6 or the like. After the bar arrangement, concrete is placed and installed. At this time, before placing concrete, a sheath pipe (PC steel material (PC steel rod) 5) is passed in advance, that is, in a portion concentrically arranged with the through-hole provided in the precast concrete block 4 for weight. (Not shown) are arranged in the horizontal direction.
The column base support block 3 according to the present embodiment is implemented in a rectangular parallelepiped shape having a size of about 160 × 90 cm in length and width and about 120 cm in height, but is not limited to this, and the size of the column to be used is, for example, The design is changed accordingly. However, since the basic structure 1 according to the present invention is mainly intended to efficiently perform dismantling / removal work, the column base support block 3 integrally formed with the soil slab 2 is constructed on a larger scale than necessary. This is not preferable in terms of dismantling / removal work, and is preferably performed on a scale that is sufficient to support the column base 10a of the column of the temporary structure 10. The rigidity required for the foundation structure 1 can be satisfactorily satisfied by appropriately adjusting the weight or quantity of the precast concrete blocks 4 for weights installed on both side surfaces of the column base support block 3, so that there is no particular problem.
Incidentally, the sheath tube is not an essential component. For example, a temporary member for forming a hole may be temporarily provided, and the temporary member may be removed after the concrete is placed to form a through hole. The following technical examples 2 and 3 have the same technical idea.

The precast concrete block 4 for weight (hereinafter may be abbreviated as “block 4”) is manufactured in a rectangular parallelepiped shape with a size of about 160 × 85 cm in length and width and about 120 cm in height, and the column base support block 3. Are placed in close contact with each other, and are arranged so that the upper surface and the side surface are substantially flush with each other. In addition, the block 4 is provided with a through-hole passing through the PC steel material 5 horizontally by driving a sheath tube, and the through-hole is formed with a through-hole (sheath tube) provided in the column base support block 3. Lined up to match.
In this embodiment, two blocks 4 are used and one block is installed on each side of the column base support block 3, but the present invention is not limited to this. It is possible to change the design flexibly according to the magnitude of the tensile resistance required for the foundation structure 1, such as using four blocks 4 and laying them side by side on both sides of the column base support block 3. . The following technical examples 2 and 3 have the same technical idea.

Thus, the column base support block 3 and the precast concrete block 4 for weight are laid in close contact in one direction, and are tensioned by the PC steel material 5 that penetrates them in common in the horizontal direction to form an integral structure. Is done. The PC steel material 5 according to the present embodiment is preferably a PC steel rod 5, but can be similarly implemented with a PC steel material such as a wire according to the structural design. The PC steel bar 5 is passed through the corresponding through holes provided in the column base support block 3 and the block 4, and both ends thereof are fixed and tensioned by the fixing tool 7, and by the tension of the PC steel bar 5 The column base support block 3 and the individual blocks 4 are joined by pressure bonding.
The PC steel bar 5 according to the present embodiment is provided with one step in the central portion when viewed from the front direction and provided in two rows with a good balance when viewed from the plane direction. It is not limited, For example, it can also implement by providing in two steps of upper and lower sides according to structural design. The PC steel bar 5 and the sheath tube can be fixed by filling with grout, or can be unbonded without filling with grout.

The basic structure 10 of the above-described large-scale temporary structure such as a bare roof is first cast on the ground 11 in a square shape when the earth slab 2 (for example, D13- @ 200 double) is viewed from the plane direction. Construction is performed using concrete, and a column base support block 3 that supports the column base portion 10a of the temporary structure 10 is also constructed and integrated with the cast-in-place concrete at the center of the upper surface of the soil slab 2. When the column base support block 3 is constructed, the column base portion 10a of a column (steel column) such as H-shaped steel or I-shaped steel is fixed to the upper surface of the soil slab 2 in addition to the reinforcement work. 6 and the like, and a sheath tube is disposed in the horizontal direction at a position that coincides with the through hole provided in the precast concrete block 4 for weight.
In addition, when constructing the soil slab 2 on the ground 11, a sand layer can be formed on the ground 11, and the soil slab 2 can be constructed on the sand layer, or abandoned concrete can be placed on the ground 11. After that, the soil slab 2 may be constructed.

After curing the soil slab 2 and the column base support block 3, precast concrete blocks 4 for weighting are provided on both side surfaces of the column base support block 3 in the through holes provided in the block 4 and the column base support block 3. Install the sheath tube in close contact with the provided sheath tube. The number of the blocks 4 may be three or more according to the required tensile resistance.
Thus, the column base support block 3 and the precast concrete block 4 for weight are laid in close contact in one direction, and the PC steel bar 5 is horizontally penetrated into these matching through holes to fix the fixing tool 7. The foundation structure 1 is constructed by establishing and introducing tension.

As explained above, according to the foundation structure and foundation construction method of a large-scale temporary structure such as a bare roof, the following effects are produced.
1) Since the foundation structure 1 can be constructed without excavating the ground 11 at all, it can be suitably carried out on sites where historic sites and historically important cultural properties cannot be excavated or where excavation is restricted .
2) Since the lower end of the foundation structure 1 is the soil slab 2, the weight of the soil slab 2 and the frictional force between the soil slab 2 and the ground 11 effectively act on the stability of the foundation structure 1. 10 can be constructed reasonably and economically.
3) The precast concrete block 4 for weight is sufficiently transportable, so it is convenient to carry, can be diverted, and does not become industrial waste. Moreover, it can respond by increasing / decreasing suitably according to the magnitude | size of the tensile resistance force requested | required of the foundation structure 1 to construct | assemble, and is excellent in flexibility.
4) When dismantling / removing the foundation structure 1 (temporary structure 10), the precast concrete block 4 for weight that can be transported can be easily removed simply by releasing the tension state of the PC steel bar 5, so workability is improved. Is excellent. In addition, since the dismantling / removal operation can be performed with almost no concrete turning work, the noise problem during the concrete turning work is eliminated, and there is no possibility of damaging the ground due to vibration during the turning work.
5) When a sand layer is formed on the ground 11 and the soil slab 2 is constructed and implemented on the sand layer, the soil slab 2 can be removed easily. When the soil slab 2 is constructed with a size of several tens of meters, it can be removed by cutting with a concrete cutter or the like into a size that is easy to remove.

FIG. 3 shows a foundation structure 21 according to the second embodiment. While the foundation structure 1 according to the first embodiment is implemented in a form in which the column base portion 10a of the column (steel column) is built in the column base support block 3, the foundation structure 21 according to FIG. The main difference is that the column base 10b is exposed.
That is, in the foundation structure 21 according to the second embodiment, the column base portion 10a of the column is placed on the upper surface of the column base support block 3, and the base plate 10b provided at the lower end of the column base portion 10a has the lower end portion. It is fixed with a long anchor bolt 8 fixed to the soil slab 2.
When constructing the column base support block 3 according to the foundation structure 21, the base plate 10b of the column base portion 10a is positioned at a predetermined height in addition to the bar arrangement operation and the sheath tube arrangement operation. After that, concrete is placed.

  Thus, according to the foundation structure 21 and the foundation construction method for a large-scale temporary structure such as a bare roof according to the second embodiment, in addition to the effects described in the above paragraph [0026], when the foundation structure 1 is disassembled and removed. Since the base plate 10b of the column base 10a of the support column can be easily detached from the column base support block 3 simply by removing the fixing tool of the anchor bolt 8, workability at the time of dismantling / removal can be further improved. Industrial waste can be further reduced.

  FIG. 4 shows a foundation structure 31 according to the third embodiment. The foundation structure 31 further improves the tensile resistance by fixing the precast concrete block 4 for weighting the foundation structure 21 according to the second embodiment with an L-shaped anchor bolt (L-shaped anchor bolt) 9. ing.

  The foundation structure 31 is raised on the soil slab 2 by embedding a bent portion of the L-shaped anchor bolt 9 when the soil slab 2 is constructed. The block 4 is manufactured by providing in the vertical direction a through hole through which the L-shaped anchor bolt 9 is passed in addition to a horizontal through hole through which the PC steel rod 5 is passed. Therefore, when the block 4 is installed on both side surfaces of the constructed column base support block 3, it is positioned through the L-shaped anchor bolts 9 in the through holes provided in the vertical direction, and then the column base support block 3 is positioned. And the base steel 31 is constructed | assembled by letting the PC steel bar 5 penetrate to the through-hole of the horizontal direction provided in the block 4 and fixing with the fixing tool 7, and introduce | transducing tension | tensile_strength. Incidentally, reference numeral 12 in FIG. 4 denotes a fixing member such as an angle member. By fixing the fixing member 12 with bolts in the vertical direction and the horizontal direction through bolts, the fixing property between the block 4 and the soil slab 2 can be improved. It is increasing.

  Thus, according to the foundation structure 31 and the foundation construction method for a large-scale temporary structure such as a bare roof according to Example 3, in addition to the effects described in the paragraph [0028] above, the tensile resistance of the foundation structure 10 is increased. Further improvement can be achieved. Further, when the base structure 1 is disassembled / removed, the block 4 can be easily detached from the soil slab 2 simply by removing the fixing tool of the L-shaped anchor bolt, so that dismantling / removing work can be performed without any trouble.

FIG. 5 shows a foundation structure 41 according to the fourth embodiment. The foundation structure 41 is formed by placing abandoned concrete (not shown) on the ground 11 and placing a plurality of precast concrete blocks 4 for weighting (five in the illustrated example) on the ground 11. The precast concrete block 4 is tensioned by a PC steel bar 5 penetrated in the horizontal direction to form an integral structure. Further, the column base 10a of the temporary structure 10 is placed on the upper surface of any one of the precast concrete blocks 4 for weight (center in the illustrated example), and provided at the lower end of the column base 10a. A base plate 10b is fixed with anchor bolts 8.
In addition, the support | pillar (column base part 10a) which concerns on this Example 4 is implemented with the steel box pillar. Moreover, although the said PC steel rod 5 is implemented by the total of two upper and lower two stages, of course, it is not limited to this, It can implement by one according to structural design, and it can implement also by three or more.

  Thus, according to the foundation structure 41 and the foundation construction method of a large-scale temporary structure such as a bare roof according to the fourth embodiment, the foundation structure 1 can be constructed without excavating the ground 11 at all. It can be suitably carried out on a site where important cultural properties are built and excavation is not possible, or on a site where excavation is restricted. Since the precast concrete block 4 for weight is sufficiently sized to be transported, it is convenient to carry, can be diverted, and does not become industrial waste. Moreover, it can respond by increasing / decreasing suitably according to the magnitude | size of the tensile resistance force requested | required of the foundation structure 1 to construct | assemble, and is excellent in flexibility. When dismantling / removing the foundation structure 1, the precast concrete block 4 for weight that can be transported can be easily removed simply by releasing the tension state of the PC steel bar 5, and the base plate 10b of the column base 10a of the column is Since it can be easily detached from the block 4, it is excellent in workability.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated examples, and includes a range of design changes and application variations that are usually made by those skilled in the art without departing from the technical idea thereof. I will mention that just in case.

DESCRIPTION OF SYMBOLS 1 Foundation structure 2 Drum slab 3 Column base support block 4 Precast concrete block for weight 5 PC steel (PC steel bar)
6 Anchor bolt 7 Fixing tool 8 Anchor bolt 9 L-shaped anchor bolt 10 Base roof (large-scale temporary structure)
10a Column base 10b Base plate 11 Ground 12 Fixing member 21, 31, 41 Foundation structure

Claims (6)

In the basic structure of large-scale temporary structures such as bare roofs,
A ground slab and a column base support block that supports the column base of the temporary structure are integrally constructed on the ground with cast-in-place concrete, and precast concrete for weight is provided on both sides of the column base support block. A plurality of blocks are installed, and the column base support block and the precast concrete block for weight are united with a PC steel material that is penetrated in common in the horizontal direction to form an integral structure, Basic structure of large-scale temporary structures such as   2. The bare roof according to claim 1, wherein a sand layer is formed on the ground, and the soil slab and the column base support block are integrally constructed of cast-in-place concrete on the sand layer. The basic structure of large-scale temporary structures.   A column base portion of a steel column constituting the temporary structure is placed on an upper surface of the column base support block, and a base plate provided at a lower end of the column base portion is fixed by an anchor bolt. A foundation structure of a large-scale temporary structure such as a bare roof according to claim 1 or 2.   The weight of the precast concrete block for weight is fixed to the soil slab by passing through an anchor bolt vertically fixed with a lower end fixed to the soil slab. The basic structure of large-scale temporary structures such as the bare roof described in 1. In the basic structure of large-scale temporary structures such as bare roofs,
A plurality of precast concrete blocks for weight are installed side by side on the ground, and the precast concrete block for weights is tensioned with a PC steel material penetrated in a horizontal direction to have an integrated structure,
The column base of the temporary structure is placed on the upper surface of any one of the precast concrete blocks for weight, and a base plate provided at the lower end of the column base is fixed with an anchor bolt. Basic structure of large-scale temporary structures such as bare roofs. In the foundation construction method of large-scale temporary structures such as bare roofs,
A ground slab and a column base support block that supports the column base portion of the temporary structure are integrally constructed on the ground with cast-in-place concrete, and precast concrete for weight is provided on both sides of the column base support block. A plurality of blocks are installed, and the column base support block and the precast concrete block for weight are united with a PC steel material that is penetrated in the horizontal direction in a single structure, Foundation construction method for large-scale temporary structures.

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