JP2007154466A - Windbreak structure, windbreak method, windbreak reconstruction method, and passage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a windbreak structure against strong winds blowing through the inside of a piloti without interfering with traffic. <P>SOLUTION: At least the leeward end of the piloti 11 laterally penetrating the ground part of the building 10 is provided with a hanging wall 12 to cover the upper part of the piloti 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a windbreak structure and a windbreak method for a passage that penetrates a ground portion of a building.

In a high-rise building or the like, a passage (hereinafter referred to as a piloty) provided to penetrate the ground floor in the horizontal direction is often provided. When an outdoor wind hits a building having such a piloty, a pressure difference is generated between the windward side and the leeward side of the building, so that a strong wind blows through the piloty.
As a structure for preventing such a strong wind blowing through the piloty, for example, Patent Document 1 discloses a windbreak in which a support frame is installed on the ground portion on the windward side of the piloty, and a climbing evergreen tree is made to cover the support frame. The structure is described.
Japanese Patent No. 2686858

  However, since the windbreak structure described above installs the support frame on the ground part of the piloty, there is a possibility that the passage in the piloty may be hindered. The present invention has been made in view of such problems, and an object of the present invention is to provide a method for preventing wind blowing through the piloty without obstructing traffic.

  The windbreak structure of the present invention is a structure for windbreaking a passage that penetrates the ground part of a building, and an upper blocking member is provided at least at an end portion on the leeward side of the passage so as to block an upper portion of the passage. It is characterized by. Here, it is preferable that the upper blocking member is provided at the windward and leeward ends of the passage. According to said wind-proof structure, the wind which blows through a channel | path can be wind-blocked, without disturbing passage.

  Moreover, the said upper obstruction | occlusion member may be installed so that the lower end may be 2 m or more and 5 m or less in height from the floor surface of the said channel | path. The upper closing member may be a hanging wall. By setting the height of the hanging wall from the floor of the passage to 2 m or more and 5 m or less, a more effective windbreak effect can be obtained without obstructing passage of the passage.

  Further, the present invention is a method for preventing wind from passing through a ground portion of a building, wherein an upper blocking member provided so as to close the upper portion of the passage is provided at least at an end portion on the leeward side of the passage. A windproof method characterized by the above.

  Further, the present invention is a remodeling method for windproofing a passage that penetrates the ground portion of an existing building in the lateral direction, and at least an end portion on the leeward side of the passage is provided with a member that covers the upper portion of the passage. It shall include a windbreak reconstruction method characterized by providing. Furthermore, this invention shall include the channel | path which penetrated the ground part of a building provided with said windbreak structure.

  According to the present invention, it is possible to prevent the wind blowing through the piloty without obstructing traffic.

Hereinafter, an embodiment of a windproof method of the present invention will be described in detail with reference to the drawings.
When an outdoor wind hits a building 10 having a piloty 11 that penetrates the ground height in the horizontal direction as shown in FIG. 1, a pressure difference is generated between the windward side and the leeward side of the pill 10, so that the wind blows into the piloty 11. . At this time, since the cross-sectional area of the piloty 11 is small with respect to the surface area of the building 10, the wind concentrates on the piloty 11, and a phenomenon in which strong wind blows into the piloty 11 occurs. As an example, the inventors conducted a simulation by numerical analysis assuming a piloty having a height of 7 m and a width of 10 m provided in a building having a height of 100 m and a width of 40 m. The maximum wind speed at a position of 5 m was about 2.7 times the wind speed on the ground when there was no building.

  In the conventional wind-proof method, based on the idea of preventing a person passing on the ground from being exposed to strong winds, a method has been used in which an obstacle that allows wind to blow through, such as planting, is provided on the ground. However, since the piloty 11 has a function as a passage, it is preferable that there is no obstacle to traffic. Therefore, in the windproof method of the present embodiment, as shown in FIG. 2, the hanging wall 12 covers the upper part of the passage at the windward side (right side in FIG. 2) and the leeward side (left side in FIG. 2) of the piloty. It was decided to provide. Such a hanging wall 12 can be provided by renovating an existing building's piloty without being provided in advance when a building having a piloty is newly constructed.

  In FIG. 2, the hanging wall 12 is provided at the windward and leeward ends of the piloty 11, but the inventors have performed simulations by numerical analysis described later on the leeward end of the piloty 11. It is preferable that only the drooping wall is provided, and that the drooping wall 12 is provided so that the lower end thereof reaches 2 m or more and 5 m or less from the piloty floor surface regardless of the height and width of the piloty 11. I found out.

Hereinafter, the simulation by numerical analysis performed by the inventors will be described in detail.
<Analysis 1>
First, in order to examine the position where the drooping wall is provided, a simulation by numerical analysis was performed for the conditions in which the drooping wall was provided at different positions in the depth direction of the piloty, and the speed in the piloty was compared. In this study, for each condition, a piloty with a height of 7 m and a width of 10 m provided in a building with a height of 100 m and a width of 40 m is targeted.

  In this study, Condition 1 in which the drooping wall is provided at both the entrance (windward side) and the exit (leeward side), Condition 2 in which the drooping wall is provided only at the entrance, Condition 3 in which the drooping wall is provided only at the exit, For the condition 4 in which the hanging wall is provided in the center of the depth direction of the piloty, a simulation is performed when the hanging wall has a hanging dimension of 1 m, 2 m, 3 m, 4 m, and 5 m, and the height within the piloty is 1.5 m. The maximum wind speed was calculated. In addition, as a comparison object, a simulation by numerical analysis was also performed in the same manner with respect to conditions where no windbreak countermeasures were taken.

  FIG. 3 is a graph showing the relationship between the drooping dimension of the drooping wall and the ratio of the maximum wind speed at a height of 1.5 m and the wind speed at a height of 100 m (hereinafter referred to as the maximum wind speed ratio) in the piloty of each condition. . FIG. 4 is a graph showing the relationship between the drooping dimension of the drooping wall and the reduction rate of the maximum wind speed ratio in each condition (hereinafter referred to as the wind speed reduction rate) with respect to the maximum wind speed ratio when no windbreak countermeasures are taken. . In the figure, the wind speed reduction rate is described so that the wind speed reduction rate becomes larger in the lower part of the graph. When the wind speed reduction ratio is located above 0%, the maximum wind speed increases compared to the condition where no wind protection measures are taken. The lower the position, the greater the wind speed reduction effect.

As shown in FIGS. 3 and 4, it can be seen that in any of the conditions 1 to 4, the maximum wind speed ratio decreases and the wind speed reduction effect increases as the drooping dimension of the drooping wall is increased.
Here, when comparing the positions where the drooping walls are provided, as shown in FIG. 3, the condition 2 where the drooping wall is provided at the entrance and the condition 4 where the drooping wall is provided at the center in the depth direction are as follows. The maximum wind speed ratio is larger than the condition 1 provided and the condition 3 provided only with the hanging wall at the outlet. In particular, when the drooping dimension of the drooping wall in condition 2 and condition 3 is 3 m or less, the maximum wind speed ratio is large, and as shown in FIG. 4, the wind speed reduction effect at this time is 0% or less (that is, the wind speed increases). is doing). This is thought to be because if a drooping wall is provided at the center or at the entrance, the cross section of the portion through which the wind blown into the piloty can pass by the drooping wall becomes small, and the wind concentrates on this portion. .

On the other hand, in the condition 1 in which the drooping wall is provided at the inlet and the outlet and the condition 3 in which the drooping wall is provided at the outlet, the wind speed reduction effect is 0% or less regardless of the drooping dimension of the drooping wall. The maximum wind speed ratio is smaller than the conditions 2 and 4 in the drooping dimensions of all the drooping walls (that is, the windproof effect is large).
As described above, it was confirmed from this experiment that the windproof effect in the piloty can be obtained by providing the drooping wall at least on the leeward side of the piloty, more preferably on both the leeward side and the windward side.

<Analysis 2>
Next, in order to quantitatively grasp the influence of the drooping dimension of the drooping wall on the windbreak effect, the drooping wall blockage rate and the height of the drooping wall lower end with respect to the ground are changed for the three conditions described below. The experiment was conducted.

  In this experiment, the condition A with a piloty height of 7 m and a width of 10 m, the condition B with a piloty height of 14 m (twice the condition A) and a width of 10 m (equal to the condition A), and a piloty height of 9 1.9m (√2 times condition A) and width 14.4m (√2 times condition A), the ratio of the drooping wall to the entire section of the piloty (hereinafter referred to as the blockage rate) is changed. Then, simulation by numerical analysis was performed.

FIG. 5 is a graph showing the relationship between the blockage rate and the maximum wind speed ratio, and FIG. 6 is a diagram showing the relationship between the blockage rate and the wind speed reduction effect. In addition, since the piloties of the conditions A to C are different in shape and the maximum wind speed ratio is different in the condition where no drooping wall is provided, the wind speed reduction rate of the conditions A to C is different from the drooping wall of each shape. Calculation is based on the maximum wind speed ratio under conditions that are not provided.
As shown in FIGS. 5 and 6, under all conditions, there is a tendency that the blocking rate increases and the maximum wind speed ratio decreases (that is, the windproof effect increases). However, even if the blockage rate is constant, if the shape of the piloty is different, the wind speed reduction effect is different, so it is difficult to quantitatively grasp the wind speed reduction effect based on the blockage rate.

  Therefore, for the conditions A to C used in the above experiment, simulation was performed by numerical analysis by changing the height of the lower end of the hanging wall with respect to the piloty floor. FIG. 7 is a graph showing the relationship between the height of the lower end of the hanging wall relative to the pilotity floor and the maximum wind speed ratio, and FIG. 8 shows the relationship between the height of the lower end of the hanging wall relative to the piloty floor and the wind speed reduction effect. It is a graph which shows.

  As shown in FIG.7 and FIG.8, in all conditions, the tendency for the maximum wind speed ratio to become small is seen, so that the height of the drooping wall lower end with respect to a floor surface becomes low. Furthermore, when each condition is compared, if the height of the lower end of the hanging wall with respect to the floor surface is equal, the maximum wind speed ratio is substantially equal regardless of the size of the piloty. Similarly, the windproof reduction effect is substantially constant under all conditions as long as the height of the hanging wall from the piloty floor is equal, regardless of the size of the piloty. Thus, it can be seen that the windproof effect changes according to the height of the lower end of the hanging wall relative to the piloty floor.

  Here, as a comparative example, as a typical example of windbreak countermeasures using planting, numerical values are given for the case where five plants with a height of 5 m and 11 plants with a height of 3 m are provided on the windward side of the piloty. When the simulation by analysis was performed, the wind speed reduction effect in the conditions which provided planting was 0.90. For this reason, in order to acquire the windproof effect equivalent to or more than the case where planting is provided, it is understood that the height from the bottom surface of the drooping wall should be 5 m or less. Moreover, when taking into consideration that a person passes a piloty, the height of a preferable drooping wall lower end is 2 m or more.

  As described above, according to this experiment, the windbreak effect by the drooping wall is determined mainly by the height of the lower end of the drooping wall relative to the floor surface, regardless of the height and width of the piloty. In particular, the height of the lower end of the drooping wall is 2 m. As mentioned above, in the range of 5 m or less, it was confirmed that the windbreak effect by a drooping wall was more than the windbreak effect provided by planting.

As described above, according to the windproof method of the present embodiment, since the hanging wall is provided at the end of the piloty, the inside of the piloty can be windproofed without obstructing the passage in the piloty. And if this drooping wall is provided at least at the leeward side of the piloty, more preferably at the windward and leeward end portions, the wind can be effectively prevented. Moreover, the wind speed reduction effect more than the wind-proof countermeasure by the conventional planting is acquired by making the height of the lower end of a drooping wall into 2 m or more and 5 m or less with respect to a piloty floor surface.
In the above description, the piloty is provided only inside the building. However, the present invention is not limited to this, and the piloty 11 extends in an arcade form from one side or both sides of the building 10 as shown in FIG. In such a case, an excellent windproof effect can be obtained by providing a drooping wall that covers the upper part of the piloty at least on the leeward end of the piloty 11.
In the present embodiment, the hanging wall is provided at the entrance and exit of the piloty. However, the present invention is not limited to this, and the upper part of the entrance and exit of the piloty may be closed by, for example, a plate material.

It is a figure which shows the building which has pilotity. It is a figure which shows the drooping wall provided in the piloty of this embodiment. It is a graph which shows the relationship between the drooping dimension of a drooping wall, and the maximum wind speed ratio. It is a graph which shows the relationship between the drooping dimension of a drooping wall, and a wind speed reduction effect. It is a figure which shows the relationship between the obstruction | occlusion rate of a piloty, and the maximum wind speed ratio. It is a figure which shows the relationship between the obstruction | occlusion rate of a piloty, and a wind speed reduction effect. It is a graph which shows the relationship between the height of the lower end of the drooping wall with respect to the floor surface of a piloti, and the maximum wind speed ratio. It is a graph which shows the relationship between the height of the lower end of the drooping wall with respect to the floor surface of a piloti, and a wind speed reduction effect. It is a figure which shows the building which has the piloty extended in arcade form.

Explanation of symbols

10 Building 11 Piloty 12 Hanging wall

Claims (7)

It is a structure that prevents wind from passing through the ground part of the building,
A windproof structure characterized in that an upper closing member is provided at at least an end portion on the leeward side of the passage so as to close an upper portion of the passage.   The windbreak structure according to claim 1, wherein the upper blocking member is provided at the windward and leeward ends of the passage.   The windproof structure according to claim 1 or 2, wherein the upper closing member is provided such that a lower end thereof has a height of 2 m or more and 5 m or less from the floor surface of the passage.   The windproof structure according to any one of claims 1 to 3, wherein the upper closing member is a hanging wall. A method of preventing wind from passing through the ground part of a building,
A windproof method, wherein an upper closing member provided so as to close an upper portion of the passage is provided at an end portion on the leeward side of the passage. A renovation method for windproofing a passage that penetrates the ground part of an existing building in the lateral direction,
A windproof remodeling method, wherein a member is provided at least at an end portion on the leeward side of the passage so as to block an upper portion of the passage. The passage which penetrates the ground part of the building provided with the windproof structure according to any one of claims 1 to 4.

Images