JP6586873B2 - Ground stabilization structure and ground stabilization method - Google Patents

Description

  The present invention relates to a ground stabilization structure provided as a means for suppressing the collapse of the ground and a ground stabilization method for suppressing the collapse of the ground.

  Conventionally, for example, a method for constructing a reinforced soil pile disclosed in Patent Document 1 has been proposed as one that enables excavation of the ground without making the ground unstable. Moreover, although it becomes a foundation for installing the solar cell panel etc. for photovoltaic power generation, a foundation structure indicated in patent documents 2 as what is piled in the ground and installed in land, for example Has been proposed.

  The method for constructing a reinforced soil pile disclosed in Patent Document 1 includes a core pipe in which a hole for feeding a filler is provided over the entire length, and a tip bit attached to the tip of the core pipe and provided with a circular flange And a plurality of blades extending in the radial direction provided on the distal end side of the flange portion, and opening a core pipe to which the distal end bit is attached to the ground while opening the back surface of the flange portion of the distal end bit The filling material is injected into the hole from the outlet hole.

  The foundation structure disclosed in Patent Document 2 has an angle with respect to the height direction, extends in different directions without interfering with each other, and has one end opened around the central portion on one side in the height direction and the other end. There are two or more through-holes that open on the other side in the height direction, and are installed in the land by driving piles that are respectively inserted into the through-holes into the ground, and formed in a bowl shape And a plurality of cylinders provided through the main body.

JP-A-2-8413 JP 2014-31700 A

  Here, the construction method of the reinforced soil pile disclosed in Patent Document 1 reaches the support layer across the potential slip surface of the ground in order to prevent the slope collapse that occurs due to the stability of the natural ground is impaired. The core pipe penetrates like this, and this core pipe has an anchor function. And the construction method of the reinforced soil pile disclosed by patent document 1 cuts a filler from the exit hole opened in the back surface of the collar part of a tip bit, in order to prevent the slip layer of the upper part of a slip surface from loosening. Inject into.

  However, in the construction method of the reinforced soil pile disclosed in Patent Document 1, since integration of the core pipe and the ground is important, it is necessary to insert the core pipe to the deep part of the support layer. At this time, in the construction method of the reinforced soil pile disclosed in Patent Document 1, in order to insert the core pipe to the deep part of the support layer, it is necessary to carry in a driving device such as a heavy machine. Since it is often difficult to carry in a driving device such as a heavy machine, the construction itself may be difficult.

  For this reason, in the construction method of the reinforced soil pile disclosed in Patent Document 1, in particular, the blades are formed by forming a plurality of blades on the flange portion of the tip bit attached to the tip of the core pipe and applying rotational torque. Ingenuity has been made to reduce the construction load by utilizing the reaction force. However, in the method for constructing a reinforced soil pile disclosed in Patent Document 1, by forming a plurality of blades on the tip bit, not only the processing degree of the tip bit is very high, but also the material cost and construction cost increase. In the first place, it becomes difficult to transport the core pipe having a plurality of blades formed on the tip bit to the site.

  In addition, the foundation structure disclosed in Patent Document 2 has a plurality of piles that are angled with respect to the height direction and extend in different directions without interfering with each other. It is not intended to prevent slope failure. For this reason, although the foundation structure disclosed by patent document 2 becomes a foundation structure for installing the solar cell panel etc. for photovoltaic power generation, it cannot suppress the collapse of the ground, such as a slope. It becomes.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to easily carry out large-scale heavy equipment etc. on the slope without requiring it. An object of the present invention is to provide a ground stabilization structure and a ground stabilization method capable of reliably suppressing ground collapse.

The ground stabilization structure according to the first aspect of the present invention is a ground stabilization structure provided as a means for suppressing the collapse of the ground, and a plurality of rod-shaped members embedded in the ground and a plurality of the rod-shaped members are connected to the ground surface. and a mounted bearing capacity plate, the plurality of the bar-like member, possess one main member embedded in the ground until the support layer of the ground, and a plurality of sub-members provided on the periphery of said main member, said The plurality of sub-members are connected to the bearing plate with their upper end portions spaced apart from each other, extending from each of the upper end portions toward the ground in different directions, approaching each other, and intersecting portions. And is formed so that the lower end portions of the crossing portions are spaced apart from each other, so that the crossing portion and the upper end portion are formed in a substantially frustum shape downward, and the crossing portion And the lower end It is formed in a substantially frustum shape orientation, characterized in that embedded in the ground.

  In the ground stable structure according to the second invention, in the first invention, the plurality of rod-shaped members are formed such that each of the sub members has a smaller cross-sectional dimension than the main member and a member length shorter. It is characterized by being embedded in the ground of the slip layer of the ground.

  The ground stabilization structure according to a third aspect of the present invention is the first aspect or the second aspect, wherein the plurality of rod-shaped members are any of a convex protrusion and a concave depression on the surface of the main member or the sub member. One or both are formed.

  In the ground stabilization structure according to a fourth aspect of the present invention, in any one of the first to third aspects, the support plate has a plurality of insertion holes through which the sub members are inserted, and upper ends of the sub members. The inner surface of each insertion hole is formed to be inclined in accordance with the inclination angle from the portion to the lower end portion and the direction in which each of the sub-members is embedded.

  The ground stabilization structure according to a fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the bearing plate protrudes from a bearing surface attached to the ground surface to form a protruding portion.

A ground stabilization method according to a sixth aspect of the present invention is a ground stabilization method for suppressing the collapse of the ground, comprising a supporting step of attaching a bearing plate to the ground surface, and connecting a plurality of rod-shaped members to the bearing plate. In the embedding process, first, a plurality of sub-members that are a part of the plurality of rod-shaped members are separated from each other with their upper ends spaced apart from each other at the position of the bearing plate. while if extending from the pressure plate in different directions towards the ground, to form a cross-section is brought closer to each other, as well as in a downward substantially pyramid shape between said intersections the upper end, further, the is extended from the intersection as the lower end of each spaced from each other, it embeds in the ground to be the be so that the upward substantially frustum shape between said intersections the lower end, then ground Obtaining reaction force from a plurality of sub-members embedded in Wherein the embedding one main member to be a part of the rod-shaped member in the ground.

  According to the first to sixth inventions, the plurality of sub-members are embedded while being inclined in different directions, so that a reaction force can be obtained when the main member is embedded in the ground, in order to obtain the reaction force. Therefore, the main member can be easily constructed even on a slope such as a steep slope or a narrow area without requiring large-scale heavy machinery.

  According to the first to sixth inventions, the construction of the main member is facilitated even on the slope, etc., so that the restriction on the construction load of the main member is reduced, and the main member is sufficiently embedded to the support layer of the ground. Therefore, it is possible to realize construction on a slope where a deeper slip surface is assumed.

  According to the first to sixth inventions, a plurality of sub-members are embedded while being inclined in different directions, so that the plurality of sub-members become entangled with the ground like a tree root system, and a plurality of sub-members like a tree root system. It becomes possible that the degree of restraint of the ground can be increased by the tangled sub-members being tangled with the ground.

  According to the first to sixth inventions, the main member and the plurality of main members can be used without carrying out complicated processing such as blades on the main member and without having to carry in large-scale heavy machinery on a slope or the like. The pile effect of the secondary member resists the pulling force, and it is possible to easily and surely suppress the slope failure of the ground while suppressing the material cost and construction cost required for construction.

  In particular, according to the third aspect of the present invention, one or both of the convex protrusions and the concave depressions are formed on the surface of the main member or the sub-member that becomes each rod-shaped member, whereby each main member or sub-member is formed. It becomes possible to improve the circumferential frictional force between the member or sub member and the ground.

  In particular, according to the fourth invention, the inner surface of the insertion hole of the bearing plate is formed to be inclined in accordance with the inclination angle of the sub member and the embedding direction, so that the inner surface of the insertion hole exhibits a guide function. Even in a construction site such as a slope where it is difficult to adjust the inclination angle and the embedding direction of the sub member, each sub member can be accurately constructed in various different directions.

  In particular, according to the fifth aspect of the present invention, each of the sub-members can be inserted into the insertion hole of the bearing plate by embedding each of the projecting portions to the vicinity of the ground surface with the bearing surface of the bearing plate being in contact with the ground surface. Since the supporting plate can be temporarily fixed to the ground surface at each projecting portion at a stage before insertion from above, it is possible to easily position the supporting plate and the sub member.

It is a perspective view which shows the slope in which the ground stable structure to which this invention is applied is provided. It is a perspective view which shows the ground stable structure to which this invention is applied. It is a front view which shows the several submember formed in the substantially drum shape of the ground stable structure to which this invention is applied. It is a top view which shows the some submember formed in the substantially drum shape of the ground stable structure to which this invention is applied. It is a front view which shows the some submember formed in the substantially C shape of the ground stable structure to which this invention is applied. It is an enlarged front view which shows the bearing plate of the ground stable structure to which this invention is applied. (A) is a front view showing a main member embedded so as to straddle the slip surface of the ground in the ground stable structure to which the present invention is applied, and (b) is a plurality of sub-resistors that resist the lifting of the slip layer. It is a front view which shows a member. (A) is a front view which shows the bearing process of the ground stabilization method to which this invention is applied, (b) is a front view which shows the submember embedded by the embedding process. (A) is a front view which shows the reaction force obtained at the embedding process of the ground stabilization method to which this invention is applied, (b) is a front view which shows the main member embedded to the support layer. (A) is a front view which shows the surrounding surface frictional force of a main member by the ground stable structure to which this invention is applied, (b) is a front view which shows the bending generate | occur | produced in the sub member. (A) is an enlarged front view showing a bar-shaped member having a surface that is formed in a substantially stable shape with a ground stable structure to which the present invention is applied, and (b) is an enlarged front view showing the bar-shaped member on which the protruding portion is formed. (C) is an enlarged front view which shows the rod-shaped member in which the hollow part was formed.

  Hereinafter, the form for implementing the ground stabilization structure 1 and the ground stabilization method to which this invention is applied is demonstrated in detail, referring drawings.

  The ground stable structure 1 to which the present invention is applied is provided to suppress the collapse of the ground. As shown in FIG. 1, for example, in order to suppress the slope collapse of the inclined ground such as a slope, It will be provided at multiple locations such as slopes.

  As shown in FIG. 2, the ground stable structure 1 to which the present invention is applied has a ground surface 8 a in which a plurality of rod-like members 2 embedded in the ground 8 and a plurality of rod-like members 2 are connected to the ground such as a slope. And a bearing plate 7 attached to the.

  As shown in FIG. 3, the plurality of rod-shaped members 2 include a main member 21 in which a steel pipe or the like is used, and a plurality of sub members 22 in which a bar steel or the like is used. The plurality of rod-shaped members 2 are provided with a plurality of sub-members 22 around the main member 21, for example, having one main member 21 and three sub-members 22. One main member 21 is provided at a substantially central position of 22.

  The main member 21 is formed so as to have a predetermined cross-sectional dimension and a member length. For example, the main member 21 has a cross-sectional dimension having a nominal diameter of about 50 mm to 100 mm and a length of about 5 m to 20 m. The sub-member 22 is formed to have a predetermined cross-sectional dimension and a member length, and has a cross-sectional dimension having a nominal diameter of about 25 mm to 30 mm and a member length having a length of about 2 m to 3 m, for example.

  The plurality of rod-like members 2 are formed such that the main member 21 and each of the sub members 22 continuously extend from the upper end 3 to the lower end 4 in a substantially linear shape. The main member 21 and each sub member 22 are provided with their upper end portions 3 protruding from the ground surface 8a and embedded in the ground 8 so that each lower end portion 4 reaches a predetermined depth. .

  Each sub member 22 is formed with a cross-sectional dimension smaller than that of the main member 21 and a shorter member length. Each sub member 22 is inclined at a predetermined inclination angle θ from a direction perpendicular to the ground surface 8 a, and the plurality of sub members 22 extend in different directions and are embedded in the ground 8. Each sub-member 22 extends from the upper end 3 to the lower end 4 and extends substantially linearly.

  The plurality of sub-members 22 are connected to the bearing plate 7 with their upper end portions 3 being spaced apart from each other, and extending from each of the upper end portions 3 toward the underground 8 so that the plurality of sub-members 22 are formed. Intersections 5 that are close to each other are formed. Further, the plurality of sub-members 22 are provided so as to be inclined from the intersecting portion 5 toward the deep portion 8b of the underground 8 so that the lower end portions 4 are separated from each other.

  The plurality of sub-members 22 are separated from each other at the upper end portions 3 and approach each other in the ground 8 to form a crossing portion 5, which expands substantially linearly from the crossing portion 5 toward the ground surface 8 a. To do. The plurality of sub-members 22 expand substantially linearly from the intersecting portion 5 toward the ground surface 8a, so that the range between the intersecting portion 5 and the upper end portion 3 is downward and the apex is disposed below. It has a substantially frustum shape.

  The plurality of sub-members 22 are close to each other to form the crossing portion 5, and the lower end portions 4 are separated from each other, and expand substantially linearly from the crossing portion 5 toward the deep portion 8 b of the underground 8. To do. The plurality of sub-members 22 expand substantially linearly from the intersecting portion 5 toward the deep portion 8b of the underground 8 so that the apex is arranged above the range between the intersecting portion 5 and the lower end portion 4. This is a generally upward frustum shape.

  The plurality of sub-members 22 have a substantially frustum shape in which the range between the intersecting portion 5 and the upper end portion 3 is downward, and a range in which the range between the intersecting portion 5 and the lower end portion 4 is upward has a substantially frustum shape. As a result, the intersection 5 is formed in a substantially drum shape with the narrowest width. At this time, the plurality of sub-members 22 are formed in a substantially drum shape in the ground 8, and a downward inclined surface 5 a is formed above the intersecting portion 5, and an upward inclined surface 5 b is formed below the intersecting portion 5. Is formed.

  In the plurality of sub-members 22, two or more sub-members 22 are embedded in the ground 8, and in particular, three or more sub-members 22 are embedded in the ground 8 and three or more sub-members 22. It is desirable that the crossing portions 5 are formed close to each other. As shown in FIG. 4, the plurality of sub-members 22 are inserted through the gap G formed so as not to contact each other.

  The plurality of sub-members 22 may be formed in a substantially drum shape as shown in FIG. 5 in addition to being formed in a substantially drum shape by forming the narrowest intersection 5. At this time, the plurality of sub-members 22 are inclined and extended in different directions and embedded in the underground 8, and continue from the upper surface 3 to the lower edge 4 from the ground surface 8 a toward the deep portion 8 b of the underground 8. Thus, it expands in a substantially linear shape.

  As shown in FIG. 4, for example, when the three sub members 22 are embedded, the support plate 7 is made of a steel material or the like formed in a substantially triangular shape. The support plate 7 is formed in a substantially triangular shape, and in particular, the upper end 3 of each sub member 22 is connected in the vicinity of each corner so that the upper end 3 of each sub member 22 is connected. They are separated from each other.

  As shown in FIG. 6, the support plate 7 is formed with a plurality of insertion holes 70 through which the upper end portions 3 of the main member 21 and the sub member 22 are inserted by penetrating a substantially triangular steel material or the like in the plate thickness direction. The In the support plate 7, for example, when one main member 21 and three sub members 22 are embedded, insertion holes 70 are formed at four locations according to the quantity of the rod-shaped members 2.

  In particular, when the through hole 70 is formed by penetrating a substantially triangular steel material or the like in the thickness direction, the inner surface 70a of each insertion hole 70 has a predetermined inclination from the vertical direction with respect to the ground surface 8a. Inclined at an angle θ. At this time, the pressure plate 7 is formed such that the inner surface 70a of each insertion hole 70 is inclined at a predetermined inclination angle θ in accordance with the inclination angle θ of each sub member 22, and each sub member In accordance with the direction of embedding 22, it is inclined in a predetermined direction.

  The pressure bearing plate 7 is attached such that a lower pressure bearing surface 7a formed in a substantially flat shape or the like is in contact with the ground surface 8a. The bearing plate 7 projects downward from the bearing surface 7a to form a plurality of projecting portions 71 such as a substantially rectangular shape. At this time, in the pressure bearing plate 7, each projecting portion 71 is embedded in the ground 8 to the vicinity of the ground surface 8a in a state where the bearing surface 7a on the lower surface is in contact with the ground surface 8a.

  For example, the pressure bearing plate 7 is formed with grooved portions 3 a extending in the circumferential direction at the upper end portions 3 of the respective rod-shaped members 2, and a pair of connecting members 30 are fitted to the grooved portions 3 a from both sides of the rod-shaped member 2. Then, the upper end portion 3 of the rod-shaped member 2 is sandwiched between the pair of connecting members 30 above the insertion hole 70. The support plate 7 is connected by the upper end portion 3 of each rod-like member 2 being sandwiched between a pair of connecting members 30.

  As shown in FIG. 7, the ground stabilization structure 1 to which the present invention is applied is provided in order to suppress the slope collapse of the slope such as a slope. The ground stable structure 1 to which the present invention is applied straddles a slip surface 80 that is a boundary between the slip layer 81 on the ground surface 8a side and the support layer 82 on the deep portion 8b side, particularly in a sloped ground such as a slope. Thus, the main member 21 such as a steel pipe is embedded in the underground 8.

  The main member 21 is embedded in the ground 8 up to the support layer 82 on the deep portion 8b side of the ground, so that the lower end portion 4 reaches the support layer 82 of the ground. The main member 21 is embedded so as to be substantially orthogonal to the ground surface 8a without being inclined from the vertical direction with respect to the ground surface 8a. Also good.

  Each sub-member 22 is inclined from the vertical direction with respect to the ground surface 8a, and does not reach the lower end portion 4 to the ground support layer 82, and is at a position shallower than the main member 21, and is a slip layer on the ground surface 8a side. It is embedded in the underground 8 up to 81. Each sub-member 22 may be embedded in the ground 8 up to the ground support layer 82 with the lower end 4 reaching the ground support layer 82.

  The ground stabilization method to which the present invention is applied includes, as shown in FIGS. 8 and 9, a supporting step of attaching the supporting plate 7 to the ground surface 8a, and a main member 21 and sub-members 22 that become a plurality of rod-shaped members 2. And an embedding step of burying in the underground 8 by connecting to the support plate 7.

  In the bearing step, as shown in FIG. 8A, the bearing plate 7 is installed on the inclined ground surface 8a such as a slope by bringing the bearing surface 7a on the lower surface of the bearing plate 7 into contact with the ground surface 8a. Attached. At this time, in the bearing step, the bearing plate 7 is pressed against the ground surface 8a, so that the projecting portion 71 is embedded in the ground 8 to the vicinity of the ground surface 8a, and the bearing plate 7 is temporarily fixed to the ground surface 8a. The

  In the embedding process, first, as shown in FIG. 8 (b), a plurality of sub-members 22 as a part of the plurality of rod-shaped members 2 are inserted into the insertion holes 70 of the bearing plate 7 attached to the ground surface 8a. Is done. At this time, in the embedding process, the plurality of sub-members 22 are inclined in different directions by being embedded in the underground 8 so as to extend in different directions.

  In the embedding process, the insertion plate 70 is formed by penetrating the support plate 7 in the plate thickness direction, and the sub member 22 is inserted from above the insertion hole 70. In the embedding process, in particular, as shown in FIG. 6, the inner surface 70 a of the insertion hole 70 of the bearing plate 7 is formed to be inclined in accordance with the inclination angle θ of the auxiliary member 22 and the embedding direction. A guide function for embedding the member 22 in a predetermined inclination angle θ and direction is exhibited.

  Next, in the embedding process, the upper end portion 3 of each sub member 22 is connected to the bearing plate 7 by a pair of connecting members 30 and the like. Next, in the embedding step, the main member 21 that is a part of the plurality of rod-like members 2 is inserted into the insertion hole 70 formed at a position substantially at the center of the bearing plate 7 from above the insertion hole 70. As shown to 9 (a), it is embedded in the underground 8 ahead of the lower end part 4 of the main member 21.

  In the embedding process, in particular, when the main member 21 is embedded in the ground 8 by extending the plurality of sub-members 22 inclining in different directions and being embedded in the ground 8, the plurality of sub-members 22 embedded in the ground 8. The reaction force R is obtained from the secondary member 22. For this reason, in the embedding process, the main member 21 can be embedded in the underground 8 using the small construction equipment 6 without using a large-scale heavy machine or the like.

  In the embedding process, reaction force R is obtained from the plurality of sub-members 22 embedded in the ground 8, the main member 21 is embedded in the ground 8 up to the ground support layer 82, and the small construction equipment 6 is removed. In the embedding step, finally, as shown in FIG. 9B, the lower end 4 of the main member 21 has reached the support layer 82 of the ground, as shown in FIG. Are connected to the bearing plate 7 to provide the ground stabilization structure 1 to which the present invention is applied.

  The ground stable structure 1 to which the present invention is applied, as shown in FIG. 10A, when a pulling force P in the vertical direction with respect to the ground surface 8a is applied, the upper end 3 to the lower end 4 of the main member 21 In a range, the main member 21 exerts a peripheral friction force F with the ground and resists the pulling force P. Furthermore, in the ground stable structure 1 to which the present invention is applied, each sub member 22 is inclined and extends in a substantially linear shape, so that a bending M occurs in each sub member 22 as shown in FIG. To do.

  In the ground stable structure 1 to which the present invention is applied, as shown in FIG. 10, the main member 21 exhibits a peripheral friction force F between itself and the ground, and a bending M is generated in each sub member 22. The bending force of the sub member 22 itself resists the pulling force P. Thereby, the ground stable structure 1 to which the present invention is applied can exhibit a large anchor resistance as compared with a structure that resists the pulling force P only by the peripheral friction force F with the ground.

  The ground stable structure 1 to which the present invention is applied has the effect that the plurality of sub-members 22 are embedded while being inclined in different directions, whereby the ground is expanded and compacted when the plurality of sub-members 22 are embedded, The effect of ensuring the resistance to the pulling force P by the friction and supporting pressure of the plurality of sub-members 22 is exhibited, and the plurality of sub-members 22 are entangled with the ground like a tree root system. Thereby, the ground stable structure 1 to which the present invention is applied can increase the degree of restraint of the ground by the plurality of sub-members 22 tangling to the ground like a tree root system.

  In the ground stable structure 1 to which the present invention is applied, the plurality of sub-members 22 are embedded so as to be inclined in different directions, whereby the plurality of sub-members 22 and the ground are locked to each other, as shown in FIG. As shown, a reaction force R is obtained when the main member 21 is embedded in the ground 8. Thereby, the ground stable structure 1 to which the present invention is applied does not require a large-scale heavy machine for obtaining the reaction force R, and the main member 21 can be applied even on a slope such as a steep slope or a narrow area. Is easy.

  The ground stable structure 1 to which the present invention is applied facilitates the construction of the main member 21 even on a slope or the like, thereby reducing the restriction on the construction load of the main member 21. At this time, since the ground stable structure 1 to which the present invention is applied can sufficiently incorporate the main member 21 up to the support layer 82 of the ground, the ground stable structure 1 can be constructed on a slope or the like where a deeper slip surface 80 is assumed. It can be realized.

  In the ground stable structure 1 to which the present invention is applied, since the main member 21 is sufficiently embedded up to the support layer 82 and the main member 21 exhibits the peripheral friction force F as shown in FIG. The main member 21 exhibits the pile effect. In addition, the ground stabilization structure 1 to which the present invention is applied has an effect that the ground is pushed and spread when the plurality of sub members 22 are embedded, and the pulling force P is applied to the pulling force P due to the friction and supporting pressure of the plurality of sub members 22. By exhibiting the effect of securing the resistance force, the sub-members 22 are entangled with the ground like a tree root system, so that the soil tension effect is exhibited.

  Thereby, the ground stable structure 1 to which the present invention is applied does not need to carry out complicated processing such as blades on the main member 21, and does not require large-scale heavy machinery or the like to be carried on the slope, etc. The pile effect of the main member 21 and the plurality of sub-members 22 resists the pulling force P, and it is possible to easily and reliably suppress the slope failure of the ground while suppressing the material cost and construction cost required for construction. It becomes possible.

  As shown in FIG. 3, the ground stable structure 1 to which the present invention is applied, for example, has a plurality of sub-members 22 formed in a substantially drum shape, so that the cross-section 5 of the plurality of sub-members 22 faces upward. The inclined surface 5a is formed. Thereby, the ground stable structure 1 to which the present invention is applied is particularly when the sliding layer 81 slides S by the downward inclined surface 5a being formed on the sliding layer 81 as shown in FIG. 7B. It is possible to resist the floating of the slip layer 81 generated in the above.

  Here, in the ground stable structure 1 to which the present invention is applied, as shown in FIG. 6, the insertion plate 70 is formed by penetrating the support plate 7 in the plate thickness direction, and the auxiliary member 22 is formed above the insertion hole 70. It is inserted. Further, in the ground stable structure 1 to which the present invention is applied, the inner surface 70a of the insertion hole 70 of the bearing plate 7 is inclined in accordance with the inclination angle θ of the auxiliary member 22 inserted into each insertion hole 70 and the embedding direction. It is formed.

  Thereby, in the ground stable structure 1 to which the present invention is applied, the inner surface 70a of the insertion hole 70 of the bearing plate 7 is inclined at a predetermined inclination angle θ and direction in accordance with the inclination angle θ of the sub member 22 and the embedding direction. As a result, the inner surface 70a of the insertion hole 70 exhibits a guide function, and each sub member can be used even on construction sites such as slopes where it is difficult to adjust the inclination angle θ of the sub member 22 and the embedding direction. It becomes possible to construct 22 accurately in various different directions.

  Further, the ground stabilization structure 1 to which the present invention is applied has the projecting portion 71 of the bearing plate 7 in the ground 8 to the vicinity of the ground surface 8a in a state where the bearing surface 7a of the bearing plate 7 is in contact with the ground surface 8a. It will be embedded. As a result, the ground stabilization structure 1 to which the present invention is applied is temporarily fixed to the ground surface 8a by the projecting portions 71 before the sub members 22 are inserted into the insertion holes 70 of the support plate 7. Therefore, it is possible to easily position the bearing plate 7 and the sub member 22.

  In the ground stable structure 1 to which the present invention is applied, as shown in FIG. 11 (a), the surface 2a of the main member 21 or the sub member 22 to be each rod-shaped member 2 is formed in a substantially smooth shape. Moreover, as shown in FIG.11 (b) and FIG.11 (c), the ground stable structure 1 to which this invention is applied has the projection part 26 or the hollow part 27 in the surface 2a of the main member 21 or the submember 22. As shown in FIG. May be.

  At this time, in the plurality of rod-like members 2, either one or both of the convex protrusions 26 and the concave depressions 27 are formed on the surface 2 a of the main member 21 or the sub member 22. For example, as shown in FIG. 11B, the rod-shaped member 2 is a weld bead provided in the circumferential direction on the surface 2 a of the main member 21 or the sub-member 22, and has a protruding portion 26 having a substantially circular shape or a substantially helical shape. Is formed. Further, for example, as shown in FIG. 11C, the rod-shaped member 2 is a dimple provided in the circumferential direction on the surface 2 a of the main member 21 or the sub-member 22, and has a substantially circular or substantially helical recess. 27 is formed.

  Thereby, the ground stable structure 1 to which the present invention is applied has either the convex protrusion 26 or the concave depression 27 on the surface 2a of the main member 21 or the sub member 22 to be each rod-shaped member 2 or By forming both, it becomes possible to improve the peripheral frictional force F between each main member 21 or sub member 22 and the ground.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, These are the technical aspects of this invention. The range should not be interpreted in a limited way.

1: Ground stable structure 2: Rod-like member 2a: Surface 21: Main member 22: Sub member 26: Projection part 27: Depression part 3: Upper end part 3a: Groove cutting part 30: Connecting member 4: Lower end part 5: Intersection part 5a : Downwardly inclined surface 5b: Upwardly inclined surface 6: Construction equipment 7: Bearing pressure plate 7a: Bearing pressure surface 70: Insertion hole 70a: Inner surface 71: Protruding portion 8: Underground 8a: Ground surface 8b: Deep portion 80: Slip surface 81 : Sliding layer 82: Support layer

Claims (6)

It is a ground stable structure provided as a means to suppress the collapse of the ground,
A plurality of rod-shaped members embedded in the ground, and a support plate attached to the ground surface by connecting the plurality of rod-shaped members;
A plurality of said bar-like member, possess one main member embedded in the ground until the support layer of the ground, and a plurality of sub-members which are provided around the main member,
The plurality of sub-members are connected to the bearing plate with their upper end portions spaced apart from each other, and approach each other while extending from each of the upper end portions toward the ground in different directions to intersect each other. And the lower end portions of the crossing portions are spaced apart from each other to form a substantially frustum shape downward between the crossing portion and the upper end portion. The ground stable structure is characterized by being formed in an upward substantially frustum shape between the portion and the lower end portion and embedded in the ground. The plurality of rod-shaped members are formed such that each of the sub-members is formed with a cross-sectional dimension smaller than that of the main member and with a shorter member length, and is embedded in the ground of the slip layer of the ground. The ground stable structure according to claim 1. 3. The plurality of rod-shaped members are formed with either one or both of a convex protrusion and a concave depression on the surface of the main member or the sub member. 4. Ground stable structure. The support plate is formed with a plurality of insertion holes through which the sub members are inserted, in accordance with the inclination angle from the upper end portion to the lower end portion of each sub member and the embedding direction of each sub member. The ground stable structure according to any one of claims 1 to 3, wherein an inner surface of each of the insertion holes is inclined. The ground supporting structure according to any one of claims 1 to 4, wherein the bearing plate protrudes from a bearing surface attached to the ground surface to form a protruding portion. A ground stabilization method to suppress the collapse of the ground,
A bearing step of attaching a bearing plate to the ground surface, and a burying step of connecting a plurality of rod-like members to the bearing plate and embedding them in the ground,
In the embedding step, first, the plurality of sub-members that are part of the plurality of rod-shaped members are different from each other from the bearing plate toward the ground so that the upper end portions thereof are separated from each other at the position of the bearing plate. while it extends in the direction to form a cross-section is brought closer to each other, the intersection and between said upper portion as well as in a downward substantially frustum shape, further, the lower end portion of each of said intersecting portion with each other to extend so as to be separated, embeds in the ground to be the be so that the upward substantially frustum shape between said intersections the lower end,
Next, a ground force is constructed by obtaining reaction forces from the plurality of sub-members embedded in the ground and embedding one main member that becomes a part of the plurality of rod-shaped members in the ground.

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