JP2012017571A - Installation structure of stress distribution slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation structure of stress distribution slabs which has earthquake resistance and is easy to construct.SOLUTION: Concrete slabs 20 are provided on a plurality of foamed resin blocks 10 which are substantially in a rectangular parallelepiped shape and construct a civil engineering structure by being arranged at a construction site. The concrete slabs 20 have through holes 20A and are transported to the construction site in the previously molded state. Fixtures 21 are inserted into the foamed resin blocks 10 via the through holes 20A to suppress the horizontal displacement between the concrete slabs 20 and the foamed resin blocks 10.

Description

  The present invention relates to an installation structure of a stress distribution plate, and more particularly to an installation structure of a stress distribution plate provided on a plurality of foamed resin blocks constituting a civil engineering structure by being arranged at a construction site.

  A construction method using a foamed resin block made of lightweight foamed polystyrene as a civil engineering material is conventionally known as an “EPS (Expanded Poly-Styrol) construction method”. This foamed polystyrene material can exhibit the merit of being lightweight when providing a civil engineering structure on soft ground. Moreover, since the said material has self-supporting property, it is possible to reduce the man-hour of retaining wall construction and earth retaining work significantly. As a result, according to the EPS method, it is possible to shorten the construction period (early recovery at the time of a disaster), reduce the construction cost, and the like.

  In addition, as a prior art regarding an EPS construction method, the thing of the following patent documents 1 and 2 etc. are mentioned, for example.

JP-A-5-33348 JP 2007-308882 A

  In the EPS method, it is necessary to provide a stress distribution plate on the foamed resin block for dispersing wheel loads and the like. When the EPS method is adopted, the construction period can be shortened and the construction cost can be shortened as described above. However, in order to effectively realize these, it is necessary to perform the above-described stress distribution plate installation work efficiently. is there. On the other hand, it is also required to secure earthquake resistance as a civil engineering structure.

  In the invention described in Patent Document 1, since concrete is cast on site, it cannot sufficiently meet the shortening of the construction period required in an emergency such as disaster recovery. On the other hand, in the invention described in the cited document 2, it is shown that the concrete floor slab is constructed at the factory (that is, precast), but the structure for preventing misalignment between the concrete floor slab and the foamed resin block is realized. Therefore, it is not always clear whether or not the countermeasure for preventing the deviation at the time of the earthquake is sufficient, that is, whether the earthquake resistance is sufficient.

  This invention is made | formed in view of the above problems, and the objective of this invention is providing the installation structure of the stress dispersion | distribution plate which has earthquake resistance and is easy to construct.

  The installation structure of the stress distribution plate according to the present invention is an installation structure of a stress distribution plate which has a substantially rectangular parallelepiped shape and is provided on a plurality of foamed resin blocks constituting a civil engineering structure by being arranged at a construction site. The structure has a through-hole, a stress distribution plate that is transported to the construction site in a pre-molded state, and is inserted into the foamed resin block through the through-hole and is substantially orthogonal to the main surface of the stress distribution plate And a fixture having a check portion that suppresses a horizontal shift between the stress dispersion plate and the foamed resin block and makes it difficult to come out of the foamed resin block. The plate-like portion in the fixture includes a first portion extending in a first direction in the horizontal direction and a second portion extending in a direction substantially orthogonal to the first portion.

  Further, in the above installation structure, the fixture can be fixed to the stress distribution plate by filling the through hole after inserting the fixture.

  According to the present invention, it is possible to obtain an installation structure of a stress distribution plate that has earthquake resistance and is easy to construct.

It is a figure which shows an example of the civil engineering structure by an EPS construction method. It is a figure which shows the installation structure of the stress distribution version which concerns on one embodiment of this invention. It is a figure which shows the through-hole provided in the stress distribution plate | version | printing included in the installation structure shown in FIG. It is a figure which shows the fixing tool inserted in the through-hole shown in FIG. It is a figure which shows the modification of the shape of the fixing tool shown in FIG. It is a figure which shows the modification of arrangement | positioning of the fixing tool in the installation structure shown in FIG. It is a figure which shows the further modification of arrangement | positioning of the fixing tool in the installation structure shown in FIG.

  Embodiments of the present invention will be described below. Note that the same or corresponding portions are denoted by the same reference numerals, and the description thereof may not be repeated.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified.

  FIG. 1 is a diagram illustrating an example of a civil engineering structure including a stress distribution plate installation structure according to the present embodiment. As shown in FIG. 1, this civil engineering structure is a banking structure formed on the ground, and includes a foamed resin block 10, a concrete floor slab 20 provided on the foamed resin block, and a concrete floor slab 20. The roadbed 30 provided on the roadbed and the pavement 40 provided on the roadbed 30 are included. Filling materials 50 are provided on both sides of the foamed resin block 10, the concrete floor slab 20, the roadbed 30 and the pavement 40.

  Each of the foamed resin blocks 10 has a rectangular parallelepiped shape. The foam resin block 10 is a lightweight member formed of foamed polystyrene, and each member can be carried manually. The foamed resin block 10 is molded in advance at a factory, and is conveyed to the construction site in a molded state. Therefore, construction at the construction site is easy.

  As described above, since the foamed resin block 10 is very light, when the embankment structure as shown in FIG. 1 is formed on the soft ground, the ground improvement can be omitted or simplified. It is also possible to shorten the construction period. The foamed resin block 10 is laminated over a plurality of layers at the construction site.

  Next, the function of the concrete slab 20 will be described. As shown in FIG. 1, the wheel load applied on the pavement 40 reaches the stress distribution plate 20 in a state of being distributed according to the thickness of the pavement 40 and the roadbed 30. The concrete floor slab 20 transmits a load to the foamed resin block 10 in a more uniform state. Thereby, deformation of the foamed resin block 10 due to stress concentration occurring in a part of the foamed resin block 10 is suppressed.

  One of the major advantages of the EPS method is the shortening of the construction period. Thereby, effects, such as early restoration at the time of a disaster and reduction of a construction cost, can be acquired. On the other hand, in order to give the concrete floor slab 20 a predetermined strength, a period for curing the concrete is necessary, and when the concrete is placed on the construction site, this curing period shortens the construction period. There is concern about hindering. In particular, when an emergency is required, such as during a disaster recovery, shortening the construction period may be a top priority issue.

  On the other hand, in the present embodiment, the concrete floor slab 20 is not a site-casting but a factory-installed precast floor slab, so that the construction period can be further shortened compared to the site-casting. However, in this case, since the foamed resin block 10 and the concrete floor slab 20 are separately placed, there is a concern that the concrete floor slab 20 may “displace” with respect to the foamed resin block 10 during an earthquake.

  Thus, there is a demand for a structure that can achieve both earthquake resistance and ease of construction (shortening the construction period, etc.). The installation structure according to the present embodiment meets such a demand.

  FIG. 2 is a view showing an installation structure of the concrete floor slab 20 according to the present embodiment. As shown in FIG. 2, the concrete floor slab 20 according to the present embodiment is a precast floor slab that is molded in advance in a factory and then carried to a construction site, and each has a through hole 20 </ b> A. . And the fixing tool 21 is each inserted in 20 A of through-holes, and the fixing tool 21 inserted in the foamed resin block 10 is fixed to the inner wall of the through-hole 20, and thereby the foamed resin block 10, the concrete floor slab 20, Are fixed to each other.

  FIG. 3 is an enlarged view of the periphery of the through hole 20A. As shown in FIG. 3, the through hole 20 </ b> A has a cross shape. Note that the cross of the through hole 20A is formed so as to extend in the short side direction (arrow DR1 direction) and the long side direction (arrow DR2 direction) of the upper surface of the concrete floor slab 20 having a rectangular shape.

  4A and 4B are diagrams showing the fixture 21 inserted into the through hole 20A, where FIG. 4A is a top view, FIG. 4B is a side view, and FIG. 4C is a perspective view.

  Referring to FIG. 4, fixture 21 has a cross shape corresponding to the cross of through hole 20A. More specifically, the fixture 21 has a first flat surface portion 21 </ b> A that extends in the short side direction of the concrete floor slab 20 and a second flat surface portion 21 </ b> B that extends in the long side direction of the concrete floor slab 20.

  Furthermore, the fixture 21 has a saw-like check portion 21 </ b> C that makes it difficult to come out after being inserted into the foamed resin block 10. The fixing tool 21 is fixed to the concrete floor slab 20 by backfilling the through hole 20A after being inserted into the through hole 20A.

  By providing such a fixture 21, a horizontal force acting on the concrete floor slab 20 at the time of an earthquake can be transmitted to the foamed resin block 10 via the fixture 21. Here, with respect to the horizontal force in the short side direction (arrow DR1 direction) of the concrete floor slab 20, the second plane portion 21B orthogonal to the arrow DR1 mainly opposes, and the long side direction (arrow DR2) of the concrete floor slab 20 The first plane portion 21A orthogonal to the direction of the arrow DR2 is mainly opposed to the horizontal force in the direction). Thus, since the fixture 21 has a plane portion extending in two directions orthogonal to each other, a horizontal force in an arbitrary direction can be efficiently transmitted to the foamed resin block 10.

  The shape of the fixture 21 is not limited to the cross shape as shown in FIG. 4, and may be an L shape as shown in FIG. Further, it may be a hollow square tube shape or a saddle shape. In any case, the fixture 21 has a first flat surface portion 21 </ b> A extending in the short side direction of the concrete floor slab 20 and a second flat surface portion 21 </ b> B extending in the long side direction of the concrete floor slab 20. The outer shape of the fixture 21 is formed only by a straight line and does not have a curved portion. By doing in this way, it can suppress that the fixing tool 21 slips with respect to the concrete floor slab 20. FIG.

  The through holes 20A and the fixtures 21 are typically arranged in a staggered manner as shown in FIG. 2, but for example, as shown in FIG. 6, the through holes 20A along the outer periphery of the concrete floor slab 20 It is also possible to arrange the fixtures 21 and, as shown in FIG. 7, it is also possible to arrange the through holes 20A and the fixtures 21 in a matrix. Furthermore, the extending directions of the first plane portion 21A and the second plane portion 21B do not necessarily need to be matched with the short side direction and the long side direction of the concrete floor slab 20, for example, as shown in the example of FIG. A cross shape rotated 45 degrees with respect to the short side direction and the long side direction of the plate 20 may also be used.

  The above contents are summarized as follows. That is, the present embodiment relates to an installation structure of the concrete floor slab 20 provided on the plurality of foamed resin blocks 10 that have a substantially rectangular parallelepiped shape and are arranged on the construction site to constitute the civil engineering structure. . The structure has a through hole 20A, and is inserted into the foam resin block 10 through the concrete floor slab 20 as a “stress distribution plate” that is conveyed to the construction site in a pre-formed state, and the through hole 20A. It has first and second flat portions 21A and 21B as “plate-like portions” extending in a direction substantially orthogonal to the main surface of the concrete floor slab 20, and the concrete floor slab 20 and the foamed resin block 10 And a fixture 21 that suppresses a horizontal shift therebetween. The first plane portion 21A extends in the arrow DR1 direction, and the second plane portion 21B extends in the arrow DR2 direction orthogonal to the arrow DR1 direction.

  Instead of the concrete floor slab 20 described above, a steel plate or a resin plate can be used. In short, if it is harder than the foamed resin portion 1, it is possible to exhibit the above-described stress dispersion function by appropriately adjusting the thickness and the like.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 10 Foam resin block, 20 Concrete floor slab, 20A Through-hole, 21 Fixing tool, 21A 1st plane part, 21B 2nd plane part, 21C Check part, 30 Roadbed, 40 Pavement, 50 Embankment material.

Claims (1)

It has a substantially rectangular parallelepiped shape, and is an installation structure of a stress distribution plate provided on a plurality of foamed resin blocks constituting a civil engineering structure by being arranged at a construction site,
A stress distribution plate having a through hole and conveyed to the construction site in a pre-formed state;
A plate-like portion that is inserted into the foamed resin block through the through hole and extends in a direction substantially orthogonal to the main surface of the stress dispersion plate, and the stress dispersion plate and the foam resin block A fixture having a check portion that suppresses horizontal displacement between the foamed resin blocks and prevents the foam resin block from coming off,
The plate-shaped portion includes a first portion extending in a first direction in the horizontal direction and a second portion extending in a direction substantially orthogonal to the first portion. .

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