JP3981659B2 - Branch line type windbreak - Google Patents

Description

  In order to prevent wind, dust, sand, etc., the present invention attaches a wind-proof material for wind-proof, dust-proof, sand-proof, etc., such as steel plate folded plates, resin nets, etc. between a plurality of pillars fixed to the ground to form a wind-proof wall It relates to the structure of windbreak walls.

The windbreak wall structure to protect the protected objects such as structures, crops, and dusty deposits from strong winds includes windproof, dustproof, and sandproofing between multiple steel frames fixed to the foundation constructed on the ground. For this reason, a windshield is installed. In addition, as a small-scale support structure with a height of about 6 m for agriculture, a structure in which a plurality of horizontal protrusions are attached to the base of the support and the tip of the horizontal protrusion and the top of the support are connected with a wire is known. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 7-7384

  However, in the conventional windbreak wall structure, it is necessary to install the windbreak wall to a higher position in order to further enhance the windbreak effect that protects the object to be protected from strong winds. As the wind blows stronger at higher positions, the foundation structure and support structure to support it must be strengthened, and the material cost and construction cost to construct the support can be reduced. It had the problem of becoming expensive.

Moreover, in the windbreak wall structure shown in patent document 1, in order to resist the tensile force of the wire which increases when the wind load which a windbreak wall surface receives becomes large, in order to apply to a large-scale support | pillar structure about 20 m high. In addition to the need to deepen the depth of the horizontal protrusions attached to the struts, the joints between the horizontal protrusions and the struts must be strengthened to resist large overturning moments, and the struts are built It has the problem that the material cost and construction cost for doing it become expensive.
An object of this invention is to provide the windbreak wall which can aim at reduction of the material cost for construction of a support | pillar and foundation structure, and construction cost.

  In order to solve the above-mentioned problem, the first aspect of the present invention is a windbreak wall composed of a pillar and a windbreak material attached between the pillars, and a pillar foundation constructed on the ground at regular intervals, on both sides of the pillar foundation row. Anchor foundation installed at equal distance from two adjacent pillar foundations at the same interval as the pillar foundation, underground beam connecting each anchor foundation and nearest pillar foundation, and 4 directions from each pillar It is characterized in that a tension member for connecting the upper part of the support column and the anchor base is installed.

  The second aspect of the invention is characterized in that, in the windbreak wall structure of the first aspect of the invention, a tensile material is installed in a range of the upper third of the support column.

  The third invention is characterized in that in the windbreak wall structure of any one of the first and second inventions, an initial tension is introduced into the tensile material.

  The fourth invention is characterized in that, in the windbreak wall structure according to any one of the first to third inventions, the tensile material is a tie rod.

  According to a fifth aspect of the present invention, in the windbreak wall structure according to any one of the first to fourth aspects of the present invention, the windproof material is a windproof net capable of moving up and down.

According to the configuration of the present invention, most of the wind load received by the windbreak wall passes through the two wind-side tensile materials and acts as a pulling force and a horizontal force to the anchor foundation on the windward side. Since it can be resisted by the frictional force of the bottom of the foundation, the depth of penetration may be shallow, and the strut can be made thinner because the burden of wind load is reduced. In addition, by connecting the pillar foundation and each anchor foundation with underground beams, and by using the anchor foundations between adjacent pillars as well, the horizontal force is the frictional force of all anchor foundation bottoms via the underground beams. Since it is possible to bear the burden, it is not necessary to increase the strength of the strut and foundation structure for installing the windproof material, and it is possible to reduce the material cost and construction cost for the construction of the strut and foundation structure. Can be planned.
By making the installation position of the tensile material lower than the top of the support column, the buckling length of the support column can be reduced and the member strength can be greatly evaluated. By setting the range, the stress intensity ratio at the upper part of the tensile material where the bending moment is superior and the lower part where the compressive force is superior are almost equal, so the struts are thinner than when installing in other ranges. can do.
By introducing the initial tension into the tensile material, it is possible to suppress the deformation of the support column itself and also to suppress the deflection of the leeward side tensile material, and thus it is possible to stabilize the behavior at the time of the load action.
In addition, by using a tie rod as the tensile material, extension of the tensile material due to creep or the like can be suppressed, so that the behavior at the time of loading can be stabilized.
By making the windproof material a windproof net that can be raised and lowered, for example, when a strong wind such as approaching a typhoon, the wind load imposed by lowering the windproof material can be reduced, and destruction / damage due to overloading of the structure can be avoided. As a result, the structure design can be simplified.

An embodiment of the present invention will be described with reference to the drawings.
The branch-type windbreak wall 1 of the present invention is a concrete support foundation 2, a concrete anchor foundation 3, a support foundation 2 and an anchor foundation 3 constructed on the ground at predetermined intervals (every fixed interval) of about 10 m to 20 m. Concrete or steel underground beam 4 that connects the two, steel column 5 having a height of about 20 m and a thickness of about 400 mm that is erected on the column foundation 2, and a thick beam that connects the anchor foundation 3 and the upper portion of the column 5. The tension member 6 has a length of about 30 mm to 50 mm.

  More specifically, the center of each of the concrete column foundations 2 is constructed on the ground so as to be located on the same straight line, and each column foundation 2 forms a column foundation column in a linear arrangement. Anchor bases 3 are provided at the same intervals as the column bases 2 and at a distance from the linearly arranged base rows in the lateral direction and at an equal distance from the adjacent column bases 2. And the column base 2 closest to the column base 4 are integrally connected by the underground beam 4, and the column upper portion and the anchor foundation 3 are directed in the four directions from the columns 5 toward the anchor foundation 3 from the top of each column 5. Are connected by a tension member 6.

  In the branch type windbreak wall 1 configured as described above, most of the wind load received by the windbreak wall passes through the two wind-up tensile members 6 and the pulling force and horizontal force to the windward anchor foundation 3 are obtained. However, since the anchor foundation 3 can be resisted by the anchor foundation weight of the anchor foundation 3 and the friction force of the anchor foundation bottom surface of the anchor foundation 3, the anchor foundation 3 may have a shallow depth of penetration, and the column 5 is also free of wind load. Since the burden is reduced, it can be made thinner.

  Further, in the branch line type windbreak wall 1 configured as described above, since the support foundation 2 and each anchor foundation 3 are integrally connected by the intermediate beams 4 in each place, the plane X shape centering on the support foundation 2 is formed. It is possible to form a continuous base structure in which two flat X-shaped base structures that are adjacent to each other in series are integrally connected to each other at the two anchor bases 3, and the anchor bases 3 can be shared by the adjacent struts 5. Therefore, the horizontal force can be borne by the frictional force of the bottom surface of all anchor foundations via the underground beam 4, so that the strength of the pillar 5 and the foundation structure for installing the windbreak material 7 can be obtained. Therefore, the material cost and the construction cost for constructing the support column 5 and the foundation structure can be reduced.

  The tension member 6 is made of a tie rod, and an initial tension is introduced. The tension member 6 is installed so that one end of the tension member 6 is connected from the upper end of the support column 5 to the upper third of the support column 5 (in the illustrated case). The one end of the tension member 6 is connected to the position of about 1/3 of the length of the support column from the upper end of the support column 5). 7 is installed to form a windproof wall 8.

  As described above, by making the installation position of the tension member 6 lower than the uppermost part of the column, the buckling length of the column 5 can be reduced (shortened), and the member strength can be greatly evaluated. By making the installation position of the range of the upper third of the support column 5, the stress intensity ratio in the support column part above the tensile material 6 where the bending moment is excellent and the support column part where the compression force is excellent are almost equal. Therefore, the column 5 can be made thinner than the case where it is installed so that one end of the tension member 6 is connected to the other range of the column 5.

By introducing the initial tension to the tension member 6, it is possible to suppress the deformation of the column 5 itself and also to suppress the deflection of the leeward side tension member 6, so that the behavior at the time of wind load action can be stabilized.
As described above, by using the tension member 6 as a tie rod, the extension of the tension member 6 due to creep or the like can be suppressed, so that the behavior at the time of wind load action can be stabilized.

The windproof material 7 may be of a type that is raised and lowered up and down according to the wind speed. It is economical because it can reduce the wind load that is borne by lowering the windbreaker during strong winds such as when a typhoon is approaching, avoiding damage and damage due to overloading of the structure, and simplifying the structure.
In addition, although illustration is abbreviate | omitted as a mechanism which raises / lowers the wind-proof material 7 with respect to the support | pillar 5, various raising / lowering mechanisms which use the winding machines, such as a winch, while using conventionally well-known wind-proof material raising rope etc. In addition, the lift drive device may be attached to the column 5.

The figure which shows one Embodiment of this invention

Explanation of symbols

1: branch line type windbreak wall 2: support foundation 3: anchor foundation 4: underground beam 5: support 6: tensile material 7: windproof material 8: windproof wall

Claims (5)

In a windbreak wall made up of struts and a windbreak material attached between the struts, strut foundations constructed on the ground at regular intervals, and two struts adjacent to each other at the same intervals as the strut foundations on both sides of the strut foundation row Install anchor foundations installed at equidistant positions from the foundation, underground beams that connect each anchor foundation and the nearest support foundation, and tension members that connect the upper part of the support and the anchor foundation in four directions from each support. A windbreak characterized by 2. The windbreak wall according to claim 1, wherein a tensile member is installed in a range of the upper third of the support column. The windbreak wall according to claim 1, wherein an initial tension is introduced into the tensile material. The windbreak wall according to any one of claims 1 to 3, wherein the tensile material is a tie rod. The windbreak wall according to any one of claims 1 to 4, wherein the windbreak material is a windproof net that can be raised and lowered.

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