JP2948512B2 - Substructure protection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a base structure for a building, a road or other above-ground structure, and a base structure for a bridge or other floating structure. Ground flow, or the water flow in which the substructure is located, i.e., a structure that protects against tidal or river flows.

[0002]

2. Description of the Related Art A device for preventing permanent deformation of a buried object due to liquefaction of the ground, in which a buried object buried in a liquefied ground on an inclined base and supported on the base via a pile foundation is formed in a streamlined manner, is proposed. (JP-A-1-102129). And, for example, in the case of a pier with a strong current, the pier may be formed to have an elliptical cross section, but this is also considered to be based on the same concept as the invention according to the above proposal.

[0003]

SUMMARY OF THE INVENTION The resistance to ground or water flow is reduced by streamlining or elliptical burials in the ground or substructures such as underground or underwater piers. Yes, but it cannot prevent the forces of the flow itself from being applied to the substructure. In addition, in the above technology, since the base structure is formed in a streamlined or elliptical shape, for example, if the flow due to liquefaction of the ground, that is, the effect of the flow is ignored, the strength of the pier itself is sufficient. However, it does not address the need to protect existing piers that can be used from the effects of flow due to liquefaction of the ground. Similarly, the piers themselves are strong enough to ignore the effects of tidal currents, and thus cannot address the need to protect existing piers that can withstand use from water flow.

[0004] The present invention provides a construction for protecting a substructure that can eliminate the effects of flow applied to the substructure in the ground or underwater and can be applied to existing substructures.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a structure for protecting a substructure in the ground or in water where the ground or water may flow from upstream to downstream from the flow. It has a wall and two side walls. 2 above
The two branch walls are arranged upstream of the substructure so that their shapes in plan view become divergent from the upstream side to the downstream side, and are supported by the underground support ground. Each of the side walls extends downstream from the downstream end of the branch wall along the substructure, and is supported by an underground support ground.

[0006] According to a preferred aspect, the branch wall is reinforced by a plurality of pile foundations driven into the support ground and a column connecting the pile foundations. According to another preferred embodiment, the diverting wall is a wall foundation driven into the supporting ground and reinforced with its own rigidity.

[0007]

When a ground flow occurs in the ground or a water flow occurs in the water, the flow acts on the protection structure but does not substantially affect the substructure. That is, the flow is diverted and split at the two diverging walls of the structure, and then flows along the two side walls, but since the structure is independent of the substructure, the flow is substantially to the substructure. Does not work.

[0008] Since the flow does not act on the substructure, the horizontal acting force exerted by the flow on the substructure can be neglected or considered small in the design of the substructure.
This makes it possible to reduce the scale of the substructure. That is, when the foundation structure is a pile foundation structure, the number of pile foundations can be reduced, and when the foundation structure is a wall foundation structure, the cross section of the wall can be reduced. Thereby, the cost required for constructing the substructure can be reduced.

[0009] Since the structure has two diverging walls whose shape in plan view is divergent from the upstream side to the downstream side, it is possible to reduce the acting force of the flow acting on the structure,
The size of the construct can be minimized.

When the foundation structure is in the ground, a dividing wall composed of a pile foundation and a column or a dividing wall composed of a wall foundation can be used. On the other hand, when the substructure is underwater, it is convenient to use a diversion wall consisting of the pile foundation and the column.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The substructure to be protected by the structure according to the invention is in the ground or in the water where water can flow from upstream to downstream. If the substructure is new, it can be protected by the structure, regardless of whether it is existing. When the soft sandy ground is sloping or dammed by a flexible cut-off or revetment, the ground flows from upstream to downstream as the ground liquefies. That is, when the ground is sloping, the ground flows from the upper side to the lower side of the slope, and when the ground is dammed by a cutoff or revetment, the ground flows toward a cutoff or revetment. On the other hand, the flow of water from upstream to downstream is attributable to tidal currents in the harbor due to the ebb and flow of the tide and to the natural flow of the river.

Therefore, the substructure at the place where the above-mentioned flow may occur is protected by the structure according to the present invention. It is preferable that the two flow dividing walls of the construction are arranged so that their shapes in plan view become divergent from the upstream side to the downstream side, and are connected to each other on the upstream side. Side walls extend downstream along the substructure from the downstream end of each branch wall. As a result, the substructure is surrounded on three sides by two branch walls and two side walls. Furthermore, in places where the flow is expected to be faster, it is preferable to arrange a wraparound wall downstream of the substructure to surround the four sides of the substructure, so that the upstream and the In places that are opposite to each other, it is preferable that the downstream side of the substructure is surrounded by two distribution walls similar to the distribution walls. The branch wall and the side wall are formed by driving a sheet pile into the supporting ground. In this case, a plurality of pile foundations are driven into the supporting ground, and the heads of these pile foundations are connected by pillars to reinforce the branch wall. The diversion wall can also be formed from a wall foundation that has been driven into the supporting ground. In this case, the dividing wall is reinforced by its own rigidity. The side walls can be wall-based or formed of sheet pile.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, which show a first embodiment, a structure 10 flows through a substructure 14 in the ground where ground 12 may flow from upstream to downstream. And two diversion walls 16 and two side walls 18. Furthermore, it is preferable to provide a wraparound wall 20.

As shown in FIG. 5A, the ground 12
It is a soft sandy ground that is inclined on the supporting ground 22, and the strength of the ground is rapidly reduced during an earthquake, and a liquefaction phenomenon that behaves like a liquid is likely to occur. The flow A of the ground 12 due to this liquefaction exerts a force on the substructure 14. As shown in FIG. 5 (b), even when the soft sandy ground 24 on the supporting ground 22 is dammed by a deadline or a revetment 26, the flow of the ground 24 due to the liquefaction phenomenon at the time of the earthquake. B exerts a force on the substructure 14.

The foundation structure 14 is a foundation of a building or other structure, on which a building or other structure is constructed. Therefore, protecting the substructure 14 with the building 10 is important in preventing the function of the building or other structures from being impaired. Since the structure 10 is independent from the substructure 14, the structure 10 can be constructed without any trouble whether the substructure 14 is existing or newly provided.

The two dividing walls 16 of the building 10 are formed so that their shapes in plan view become divergent from the upstream side to the downstream side, and are connected to each other on the upstream side. It is arranged further upstream and is supported by the underground support ground 22. The two dividing walls 16 need to have a length equal to or greater than the entire width of the substructure 14 when projected on the upstream side of the substructure 14 facing the flow A of the ground. It is not necessary that the other diverging wall be symmetrical. The flow A of the ground 12 is divided by the two dividing walls 16 and distributed to the side of the substructure 14.

The dividing wall 16 is a sheet pile in the embodiment shown, but prior to the driving of the sheet pile,
A required number of pile foundations 30 are arranged so as to conform to the divergent shape of the sheet pile and are driven into the support ground 22. afterwards,
The pillar 32 is welded to the head of the pile foundation 30, and the pile foundations 30 are connected to each other. The driving of the sheet pile is performed after the driving of the pile foundation 30 and before the connection of the columns 32 or after the coupling of the columns 32, and the sheet pile is reinforced with the pile foundation 30 and the columns 32.

The side wall 18 extends downstream from the downstream end of each of the branch walls 16 along the substructure 14 and is supported by an underground support ground 22. The side wall 18 is, in the embodiment shown, a sheet pile, covering the entire portion of the substructure 14 lateral to the flow A. The side wall 18 receives the resistance of the flow of the ground 12 distributed by the branch wall 16, but does not directly receive the force of the flow itself. Therefore, it is not necessary to reinforce the side wall 18 with a pile foundation.

A wrap prevention wall 20 is connected to the side wall 18. When the flow A of the ground 12 is fast, there is a possibility that the ground passing through the side wall 18 may wrap around to the downstream side of the substructure 14, but if the wrap-around preventing wall 20 is provided in the building 10,
Damage to the substructure 14 due to the wraparound of the ground can be prevented.

Referring to FIGS. 3 and 4, which illustrate a second embodiment, a structure 40 flows from a stream A through a substructure 14 in the ground where the ground 12 may flow from upstream to downstream. It is provided with two diversion walls 42 and two side walls 44 for protection. In this case as well, the sneaking prevention wall 46 is used.
It is preferable to provide As shown in FIG. 5A, the ground 12 is a soft sandy ground and a support ground 22.
The one that is inclined above. In this embodiment, a detailed description of the substantially same structure as the above embodiment will be omitted.

The two dividing walls 42 of the building 40 are formed so that the shape thereof in plan view becomes divergent from the upstream side to the downstream side, and they are connected to each other on the upstream side. It is a wall foundation located further upstream and supported by an underground support ground 22. This wall foundation is reinforced in the embodiment shown by a support wall 48. Since the rigidity of the wall foundation itself is large, the wall foundation reinforces itself without providing the support wall 48. However, depending on the size of the foundation structure 14, the length of the branch wall 42 is increased. , It is preferable to reinforce it with the support wall 48.

The side wall 44 is a wall foundation that extends downstream from the downstream end of each of the branch walls 42 along the substructure 14 and is supported by the underground support ground 22. As described above, the side wall 44 can be formed of a sheet pile because it only receives the resistance of the flow of the ground 12.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a protection structure for a substructure according to the present invention.

FIG. 2 is a front view of the substructure protection structure shown in FIG. 1;

FIG. 3 is a plan view of another embodiment of the substructure protection structure according to the present invention.

FIG. 4 is a front view of the protection structure for the substructure shown in FIG. 3;

FIG. 5 shows the ground that may flow,
(A) and (b) show different places.

[Explanation of symbols]

 10, 40 Building 12, 24 Ground 14 Substructure 16, 42 Dividing wall 18, 44 Side wall 20, 46 Deflection prevention wall 22 Support ground 30 Pile foundation 32 Post

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hitoshi Murata 1043 Shimoyama, Onigabo, Oji, Tsukuba-shi, Ibaraki 1 Inside Kumagaya Gumi Technical Research Institute Co., Ltd. 1043-1 Shimoyama 1 Inside Kumagaya Gumi Technical Research Institute Co., Ltd. (72) Inventor Noriaki Sendou 1043 Shimoyama Ogika-kubo Tsukuba City, Ibaraki Prefecture 1 Inside Kumagaya Gumi Technical Research Institute Co., Ltd. (JP, A) JP-A-5-140955 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E02D 31/10 E02D 27/34

Claims (3)

(57) [Claims] Claims: 1. A structure for protecting a substructure located in the ground or in water, in which ground or water may flow from upstream to downstream, from a flow, comprising: Two distribution walls, which are arranged upstream of the substructure so that their shapes in plan view become divergent from the upstream side to the downstream side, and are supported by an underground support ground; And a sidewall extending downstream along the substructure from a downstream end of the substructure and supported by underground support ground. 2. The protection structure for a substructure according to claim 1, wherein the branch wall is reinforced by a plurality of pile foundations driven into the support ground and a column connecting the pile foundations. . 3. The protection structure for a substructure, wherein the branch wall is a wall foundation driven into the supporting ground and reinforced with its own rigidity.