JP4533202B2 - Windbreak - Google Patents

Description

The present invention forms windproof wall surfaces by attaching windproof materials for windproof, dustproof, sandproof, etc., such as steel plate folded plates, resin nets, etc., between multiple pillars fixed to the ground for windproof, dustproof, sandproof, etc. It relates to the structure of windbreak walls.

The windbreak wall structure for protecting structures, crops, granular deposits and other objects to be protected from strong winds is to prevent wind, dust, and sand between multiple steel frames fixed to the foundation constructed on the ground. It is known to install windproof material. 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. Not only does the area increase, but the wind blows stronger at higher positions, so the foundation structure and support structure to support it must be strengthened, and the material and construction costs to build the support Has 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 in order to resist a large overturning moment, and the struts are constructed. 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.

The inventors of the present invention previously described in Japanese Patent Application No. 2003-349715, a column foundation constructed on the ground at regular intervals, and two column foundations adjacent to each other at the same interval as the column foundations on both sides of the column foundation row. Install anchor foundations installed at equidistant positions from each other, underground beams that connect each anchor foundation and 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 patent application has been filed for a branch-type windbreak structure.

In the above-mentioned patent, because the foundation structure is such that the support foundation and anchor foundation are connected by underground beams and the wind load is processed throughout the foundation, the frictional force on the side on which the pulling force acts decreases as the wind load to be processed increases. The anchor foundation becomes larger to prevent damage, the beam bending becomes larger because the large bending moment is handled by the underground beam, and it is necessary to dig deeper to build the foundation, resulting in higher material costs and construction costs. There was a case.

Therefore, the present invention proposes an improved technique of the patent.

The first aspect of the present invention is a windbreak wall provided with struts erected at appropriate intervals and a windbreaker attached between the struts, a strut foundation fixed to a lower end portion of the struts, and a column of the strut foundations And an anchor foundation installed continuously in parallel with the column of the column foundations, and a plurality of tensile members for connecting the column upper part and the anchor foundation in four directions from the columns. It is characterized by.
In addition, the second invention is characterized in that, in the first invention, the tensile material is extended in a direction substantially orthogonal to the plan view .

The third invention is characterized in that in the windbreak wall of the first or second invention, at least one anchor foundation is also used as a quay foundation.

  According to a fourth aspect of the present invention, in the windbreak walls according to the first to third aspects of the invention, the support foundation is a pile foundation, and the pile foundation and the support pillar are integrally coupled.

According to a fifth aspect of the present invention, in the windbreak wall according to the first to fourth aspects of the present invention, the tensile material is connected to a range of the upper third of the support column.

According to a sixth aspect of the present invention, in the windbreak wall according to the first to fifth aspects of the present invention, the tensile material is a tie rod.

According to a seventh aspect of the present invention, in the windbreak wall of the first to sixth aspects of the invention, the windproof material is a windproof net that can be raised and lowered.

  According to the configuration of the present invention, most of the wind load acting on the windbreak wall between the single pillars acts as a pulling force and a horizontal force on the windward anchor foundation via the windward tensile material. If an anchor foundation with a rectangular cross-section is constructed in parallel with the row, it can be resisted by the weight of the anchor foundation and the frictional force of the bottom surface. Cost can be reduced. On the other hand, if the height of the foundation is increased, the depth of penetration will be deepened, but the installation space for the foundation can also be reduced.

  Further, by applying most of the load to the tensile material, the strut can be made thinner and the strut base can be made smaller.

Moreover, since a large pushing force acts on the support foundation, if the ground is weak, the direct foundation may fall short of strength. In that case, a pile is required, but footing can be omitted by adopting a one-pillar-one-pile structure.

Furthermore, the anchor foundation can also be used as a quay foundation when building a windbreak along the sea. The quay foundation serves to prevent waves from directly hitting the land and to prevent the land-side sediment from collapsing to the sea, but it should be designed so that it can be used in consideration of the load acting on the windbreak wall. Therefore, material costs and construction costs can be reduced compared to separate construction.

Further, by lowering the installation position of the tensile material from 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 it as the range of 3, the stress intensity ratio in the lower part where the bending moment is excellent becomes substantially equal, so that the column can be made thinner than the case where it is installed in another range.

Further, by introducing the initial tension to the tensile material, it is possible to suppress the deformation of the support column itself and to suppress the deflection of the leeward side tensile material, so that the behavior during the load operation can be stabilized.

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.

Furthermore, by making the windproof material a windproof net that can be moved up and down, for example, when a strong wind such as when a typhoon is approaching, the wind load that is borne by lowering the windproof material can be reduced, and destruction and damage due to overloading of the structure can be avoided. As a result, the strength of the structure can be reduced.

  Hereinafter, as a best mode for carrying out the present invention, a windbreak wall in which a windbreak material is attached to form a windbreak wall will be described in detail with reference to the drawings.

  A so-called branch line type windbreak wall 1 to which the present invention is applied is, for example, as shown in FIG. 1, a steel column 4 having a height of about 20 m and a thickness of about 400 mm that is projected at predetermined intervals of about 10 m to 20 m. A concrete support foundation 2 fixed to the lower end of the support pillar 4, a concrete anchor foundation 3 constructed continuously in parallel with the columns of the support foundation 2, and the anchor foundation 3 and the upper part of the support 4 Are provided with a tensile member 5 having a thickness of about 30 mm to 50 mm and a windbreak wall 6 attached to the column 4.

Each concrete foundation 2 made of concrete is an independent direct foundation of about 2 m square, and disperses the load on the wide bottom surface and transmits it to the ground against the pushing force caused by the wind load acting on the pillar 4. The support bases 2 are continuously constructed so as to be positioned on a straight line, and constitute a column of the support foundations 2.

The concrete anchor foundation 3 is a continuous direct foundation having a width of about 3 m. The concrete anchor foundation 3 is connected to the column 4 by tensile members 5 pulled in four different directions from the upper part of each column 4, and wind loads acting from the tensile members 5 are applied. Resists the pulling force and horizontal force caused by the self-weight and frictional force of the bottom of the foundation. The anchor foundation 3 is disposed on each side of the column of the support foundation 2.

The tension member 5 is stretched so that one end side is connected by the anchor base 3 and a tensile force is applied to the support column 4 connected on the other end side. The tension member 5 may be connected in any angular direction as long as the tension member 5 is stretched so that a tensile force is applied to the column 4 from four different directions.

  In the branch line type windbreak wall 1 configured as described above, most of the wind load acting on the windbreak wall surface between the single support posts passes through the windward tension member 5 and the weight and foundation of the anchor foundation 3 on the windward side. Although it resists by the frictional force of the bottom surface, it is possible to reduce the construction cost by lowering the height of the foundation to reduce the depth of penetration. On the other hand, if the height of the foundation is increased, the depth of penetration will be deepened, but the installation space for the foundation can also be reduced. Further, by applying most of the load to the tensile material, the strut can be made thinner and the strut base can be made smaller.

  The tension member 5 may be a wire or a tie rod and may be connected to a range of 1/3 height from the upper part of the support column 4. A steel plate folded plate or a resin net having an opening ratio of about 40% between the support columns 4. Windproof material 6 such as the above may be installed to form a windproof wall.

  Windproof material 6. You may make it the form opened / closed up and down according to a wind speed. The wind load that is borne by lowering the windbreaker during strong winds such as when a typhoon is approaching reduces the damage and damage caused by overloading of the structure, and also reduces the strength of the structure, further improving economy. It becomes possible. At this time, you may make it comprise the wind-proof material 6 with what is called a wind-proof net.

  FIG. 2 shows another embodiment of the windbreak wall 1 to which the present invention is applied.

  In the example shown in FIG. 2, a so-called one-pillar one-pile type pile foundation 2 a is provided as an alternative to the above-described pillar foundation 2. In this pile foundation 2a, a steel pipe that is slightly larger than the column 4 and the pile 11 is arranged outside the joint between the column 4 and the pile 11, and protrusions such as stud bolts are attached to the outer surface of the column 4 and the inside of the steel pipe. It is effective in terms of construction cost if it is used when the inside is arranged and filled with concrete, and it is used when the ground is soft and the strength is insufficient on the direct foundation.

  FIG. 3 shows still another embodiment of the windbreak wall 1 to which the present invention is applied.

  In the example shown in FIG. 3, the anchor foundation 3 is also used as the quay foundation 7. The quayside foundation 7 is composed of a sheet pile 12 and a slant pile 13 for resisting a side pressure received from the ground on the land side, and a concrete foundation 14 for joining them at the upper part. The structure is such that the water pressure generated by the waves and tides coming from the sea cancels the lateral pressure from the ground. If the tension member 5 of the windbreak wall 6 is connected to the quay foundation 7, the tensile force acting on it will be Since it acts in the same direction of the land as water pressure, it can also function as an anchor foundation. If the foundation strength is insufficient, reinforcement can be used. When installing in contact with a quay, if this form is adopted, the construction cost can be reduced.

  FIG. 4 shows a configuration in which the anchor foundation 3 is also used as the quay foundation 7 and a so-called one-pillar and one-pile type pile foundation 2a is provided. Even in this configuration, it is needless to say that the same effect as described above can be obtained.

It is a figure which shows one Embodiment of the windbreak wall to which this invention is applied. It is a figure which shows the example which comprised the windbreak wall to which this invention was applied by what is called a 1 pillar 1 pile type. In the windbreak wall to which this invention is applied, it is a figure for demonstrating about the case where an anchor foundation is combined with a quayside foundation. In the windbreak wall to which this invention is applied, it is a figure for demonstrating about the example which can also use an anchor foundation also as a quayside foundation, employ | adopting a pillar 1 pile type.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Windbreak wall 2 Column foundation 2a Pile foundation 3 Anchor foundation 4 Column 5 Tensile material 6 Windbreak material 7 Quay foundation

Claims (7)

In a windbreak wall comprising struts erected at appropriate intervals and a windbreak material attached between the struts,
A strut foundation fixed to the lower end of the strut;
On both sides of the column foundation column, anchor foundations installed continuously in parallel with the column column column,
A windbreak wall comprising a plurality of tension members connecting the upper part of the support and the anchor foundation in four directions from each support. The tensile material is extended in a direction substantially orthogonal to the plan view.
The windbreak wall according to claim 1 . The windbreak wall according to claim 1 or 2 , wherein at least one anchor foundation is also used as a quay foundation. The above-mentioned support foundation is a pile foundation,
The windbreak wall according to any one of claims 1 to 3, wherein the pile foundation and the support column are integrally coupled. 5. The windbreak wall according to claim 1 , wherein the tensile material is connected to a range of an upper third of the support column. The windbreak wall according to any one of claims 1 to 5 , wherein the tensile material is a tie rod. The windbreak wall according to any one of claims 1 to 6 , wherein the windbreak material is a windbreak net that can be raised and lowered.

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