JP2018119336A - Reinforced structure of embankment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforced structure of embankment which can easily prevent the collapse of a wall body by using a wall body composed of a sheet pile or the like.SOLUTION: A reinforced structure of embankment comprises a wall body 4 installed at intervals inside embankment 2 provided on the ground 100, and a support member 5 erected between the pair of wall bodies 4. The support member 5 and the wall body 4 are connected with a tie rod 6, respectively. The tie rod 6 includes a fixture 7 having U shape threadedly engaged with the support member, and a tie rod body 8 which has, at its end, an engaging portion 8a having a through hole through which the fixture can be inserted and slidably and rotatably connected along the fixture in a state where the fixture is inserted. The support member 5 has a pair of fixing holes 12 arranged at different height positions on both fixing surfaces opposed to the wall body and for inserting fixing the fixture. The fixing holes 12 provided on respective fixing surfaces 5a are provided so that their arrangement direction is reversed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an embankment reinforcement structure using a tie rod which is suitably used for embankment reinforcement such as a bank.

  In order to reinforce embankments such as rivers and harbor embankments, wall sheets such as sheet piles are installed on the ground so that they face each other at a predetermined interval, and tie rods are placed between the walls. An embankment reinforcement structure in which walls are connected to each other is known.

  For example, in Patent Document 1 (Japanese Patent Laid-Open No. 11-229372), wall bodies are installed on both sides of a natural ground to be reinforced, a horizontal hole is drilled in the natural ground, a guide pipe is installed, In the tie rod construction method in which a bulge is installed on the outer surface of the body and both ends of the tie rod inserted through the guide tube are fixed, the tie rod is made flexible and the bulge of the position corresponding to the end of the guide tube of one wall body A tie rod characterized in that a guide bend pipe is installed on the outer surface, one tie rod is bent through 90 ° through the guide bend pipe and continuously inserted into two holes, and both ends of the tie rod are fixed by a fixing tool. The construction method is disclosed.

  In this Patent Document 1, the wall body is configured by connecting a plurality of sheet piles, and an erection material that reinforces the wall surface is provided in a substantially horizontal direction so as to straddle the plurality of sheet piles. The structure which connects timbers with a tie rod is adopted.

JP-A-11-229372

  However, in the method of Patent Document 1 or the like, since a set of tie rods is connected, a wall body such as a sheet pile to be placed is buried to a sufficient depth in order to sufficiently reinforce the natural ground. There was a need to do. Here, the wall body constructed by connecting sheet piles and the like in the length direction is a long member that continues along the length direction of the embankment and the like, and the work of inserting these wall bodies deeply into the ground Had the problem of becoming a big deal.

  Therefore, the technical problem to be solved by the present invention is to provide an embankment reinforcement structure that can easily prevent the wall body from collapsing using a wall body composed of a sheet pile or the like.

  In order to solve the above technical problem, the present invention provides an embankment reinforcing structure having the following configuration.

According to the first aspect of the present invention, the pair of wall bodies installed at intervals inside the embankment provided on the ground, and the wall body is erected between the pair of wall bodies inserted into the ground. In the reinforcement structure of the embankment in which the strut member and the wall body are respectively connected by tie rods,
The tie rod has a U-shaped fixing tool screwed to the support member and an engaging portion having a through-hole through which the fixing tool can be inserted, and the fixing tool is inserted. And a tie rod body that is slidably and rotatably coupled along the fixture.
The support member has fixing holes arranged obliquely on both fixing surfaces facing the pair of wall bodies and into which the leg portions of the fixture are inserted, and is provided on both the fixing surfaces. The fixing hole is provided so that the arrangement direction is opposite to each other, and provides a reinforcing structure for embankment.

  According to a second aspect of the present invention, there is provided the embankment reinforcing structure according to the first aspect, wherein the tie rod fixing member is screwed to the support member so that a central axis is common.

  According to a third aspect of the present invention, the column member includes a fixing plate attached along the fixed surface and having an insertion hole provided in the same array as the fixed hole. Or the embankment reinforcement structure of a 2nd aspect is provided.

According to the fourth aspect of the present invention, four fixing holes of the support member are arranged in a lattice shape at positions corresponding to each other on both fixing surfaces,
Any one of the first to third aspects is characterized in that the fixing tool is inserted into a fixing hole positioned obliquely to each of the fixing surfaces and fixed in a state of passing through both the fixing surfaces. Provide embankment reinforcement structure.

  According to a fifth aspect of the present invention, there is provided the embankment reinforcing structure according to any one of the first to fourth aspects, wherein the support member is formed of an H-shaped rope.

  According to the present invention, since the wall body and the column member are connected by the tie rod, the wall body can be firmly supported by the column member without deeply inserting the wall body continuous in the length direction into the ground. it can. Further, the support members are provided so that the fixing holes for inserting the tie rod fixing tools are obliquely arranged on both sides, and the arrangement direction is reversed on the front and back sides. The individual arrangement direction means a direction in which the fixing holes of the front and back fixing surfaces are viewed from either one of the front and back fixing surfaces. Thus, by reversing the arrangement direction of the fixing holes, the tension of the tie rods provided on the front and back sides is applied coaxially, the tension applied to the support member is offset, and an uneven load is not applied. Thereby, an extra external force does not reach a support | pillar member, but a banking can be reinforced firmly.

  Further, since the tie rod is composed of a U-shaped fixture and a tie rod main body that is slidably and rotatably connected to the fixture, the tie rod is displaced in the vertical and horizontal directions due to an external force applied to the wall body. Even so, the connected state can be maintained without the tie rod body being displaced and damaged.

It is a schematic diagram which shows the internal structure of the embankment which employ | adopted the embankment reinforcement structure concerning embodiment of this invention. It is a top view which shows a tie rod and a steel sheet pile fixed structure. It is a side view which shows a tie rod and a steel sheet pile fixed structure. It is a top view which shows a tie rod and a retaining pile fixed structure. It is a side view which shows a tie rod and a retaining pile fixed structure. It is a figure which shows a tie rod, a storage pile, and arrangement | positioning structure seen from the fixed surface side.

  Hereinafter, the embankment reinforcing structure according to the embodiment of the present invention will be described with reference to the drawings.

  Drawing 1 is a mimetic diagram showing the internal structure of the embankment which adopted the embankment reinforcement structure concerning the embodiment of the present invention. The embankment 1 is formed by embankment 2 on the riverbed ground 100 and forms a bank protection. The left side in the figure where the ground 100 is raised is the land side, and the opposite side is the river side.

  Inside the embankment 2, a wall body 4 made of a steel sheet pile 3 is driven at a predetermined interval, and a retaining pile 5 is provided between the wall bodies 4. The steel sheet piles 3 are placed on the riverbank ground 100, and a plurality of the steel sheet piles 3 are connected by joints 3a formed on both edges in the width direction to constitute the wall body 4. The reserve pile 5 corresponds to an example of the support member of the present invention, and is composed of an H-shaped rope. A tie rod 6 is stretched between the wall body 4 and the holding pile 5.

  Since the wall body 4 composed of the steel sheet piles 3 needs to be placed while connecting the plurality of steel sheet piles 3, it takes a lot of time for installation on the ground 100, while the retaining pile 5 has a predetermined interval. Since each of them is arranged independently, it is less troublesome to place and is placed deeper than the wall 4.

  The tie rod 6 is formed by engaging a U bolt 7 as a fixture fixed to the flange 5a of the retaining pile 5 which is an example of a fixing surface of the present invention, and a tie rod body 8 fixed to the steel sheet pile 3. Yes.

  FIG. 2 is a plan view showing a structure for fixing a tie rod and a steel sheet pile, and FIG. 3 is a side view showing a structure for fixing a tie rod and a steel sheet pile. On the surface (outer surface) of the wall 3 of the wall body 4 formed of a plurality of steel sheet piles 3 on the side where the retaining pile 5 is not provided (outer surface), a bellows formed of two channel steels 9 and 9 is installed. Has been. In the state in which the outer surfaces of the webs of the two channel steels 9 and 9 face each other, the flanges of both the channel steels 9 and 9 are screwed to the surface of the web 3b of the steel sheet pile 3 by the fixing screw 10. Has been.

  At the attachment position of the tie rod 6 of the steel sheet pile 3, one through hole is provided at a position corresponding to the gap 9 a between the two erected channel steels 9, 9. A fixing plate 11 is disposed on the outer surface of the flange of the two grooved steels 9 and 9 that are erected. The fixing plate 11 is provided with one through hole 11a at a position corresponding to the gap between the two grooved steels 9 and 9 which are erected, and is screwed to the erection. One end of the tie rod body 8 is inserted through the through hole of the steel sheet pile 3, the gap 9 a between the two groove steels 9 and 9, and the through hole 11 a of the fixing plate 11 in order, and the outside of the groove steel 9 and 9. Protruding. A nut 12 is screwed to an end portion 8 a of the tie rod body 8 that penetrates the fixing plate 11 and protrudes toward the outer surface of the steel sheet pile 3.

  FIG. 4 is a plan view showing a structure for fixing the tie rod and the retaining pile 5, and FIG. 5 is a side view showing the structure for fixing the tie rod and the retaining pile. The reserve pile 5 is formed of H-shaped steel, and is installed on the steel sheet pile 3 with the outer surface of the flange 5a facing. The surface of the flange of the retaining pile 5 constitutes a fixed surface of the tie rod, and four through holes are respectively provided in a lattice shape at the mounting position of the tie rod 6 on the fixed surface. In addition, as shown in FIG. 1, in this embodiment, the retaining pile 5 and the steel sheet pile 3 are connected with the tie rod 6 at two upper and lower portions, and four through holes are provided at the connection positions of the respective tie rods. It is done.

  On the inner surface of each flange, four through holes 5h are formed so as to open on both sides of the web 5b. The four through-holes 5h are symmetrical with respect to the central axis of the retaining pile 5, and are arranged in a lattice form so as to form two rows and two rows. The four through-holes formed in the fixing surface 5a are used for fixing by inserting the leg portions of the U-bolt 7 as a pair of two diagonally arranged holes.

  A fixing plate 13 provided with four through holes is disposed on the fixed surface 5 a of the reserve pile 5. The four through holes 13h of the fixing plate 13 have the same arrangement as the through holes 5h provided in the fixed surface 5a, and are provided at positions corresponding to the through holes 5h.

  The two legs of the U-bolt 7 include two through-holes 13h of the fixing plate 13 located on the insertion side, two through-holes 5h formed on the fixing surface 5a of the flange on the insertion side and the back side, and the back side The two through holes 13h arranged obliquely of the fixing plate 13 are sequentially inserted and protruded to the surface side of the fixing plate 13. A nut 14 is screwed to the end portions 7b of the two straight portions of the U bolt 7 protruding outside the fixing plate 13.

  That is, the U bolts 7 and 7 connected to the tie rods inserted from both sides of the storage pile 5 through the fixing number 13 are supported by one flange of the storage pile 5. Thereby, it acts so that the external force applied via both the tie rods 6 may cancel each other in one flange. Therefore, excessive external force is not applied to the reserve pile 5 and damage such as deformation can be prevented.

  As shown in FIG. 6, the U bolts 7 are arranged in a lattice shape, and the retaining bolts are arranged in two through holes 5h in which the positions of the curved portions of both U bolts 7 are arranged in an oblique direction. 5 is inserted from both sides of the pile 5, so that the position of the curved portion 7c corresponding to the central axis of the two U bolts 7 located on both sides of the retaining pile 5 is, for example, on one straight line so that the opposite tension is balanced. It is attached to be located. Thereby, it is prevented that the external force biased to the reserve pile reaches.

  The tie rod body 8 has a flat portion 8b as an engaging portion formed by pressing on one end side of the steel rod, and a through hole is formed at the center of the flat portion 8b. The through hole of the flat portion 8 b of the tie rod body 8 is inserted through a U bolt 7 fixed to the retaining pile 5. Thereby, the flat part 8b located at one end of the tie rod main body 8 is slidable in the horizontal direction along the curved part 7c of the U bolt 7 and can be rotated around the curved part 7c of the U bolt 7. Thus, it is engaged with the U bolt 7.

  Inside the wall formed by the steel sheet pile 3, earth and sand are thrown to an altitude higher than the bottom of the riverbank, which is the ground on which the steel sheet pile 3 is placed. Thereby, the force which goes to the outer side of the wall body 4 acts on the wall body 4 by the balance of the earth pressure and water pressure of a riverbank, and the earth pressure and groundwater pressure of a land side. The wall body 4 is stably held by receiving the force acting on the wall body with the tie rod 6 and supporting it with the reserve pile 5.

  The steel sheet pile 3 may be inclined outward in the vertical plane due to ground subsidence, landslide, or the like, and rotational displacement in the vertical plane may occur. Here, the flat portion 8b of the tie rod main body 8 that engages with the U bolt 7 fixed to the retaining pile 5 rotates around the curved portion 7c of the U bolt 7, so that the tie rod main body 8 becomes the steel sheet pile 3 It takes a posture according to the rotational displacement of. Therefore, it is possible to prevent a bending stress from being generated in the tie rod body 8 to prevent breakage, and to prevent further inclination of the steel sheet pile 3.

  Further, a horizontal force may act on the steel sheet pile 3 due to ground subsidence or landslide. Here, the flat portion 8 b of the tie rod body 8 is engaged with the U bolt 7 fixed to the retaining pile 5 so as to be slidable and rotatable along the curved portion 7 of the U bolt 7. Accordingly, the flat portion 8b of the tie rod body 8 slides and rotates in a direction corresponding to the force in the horizontal direction, and substantially only the tension acts on the tie rod body 8. Thus, bending stress is prevented from being generated in the tie rod body 8, and damage to the tie rod body 8 is prevented. Further, since the flat portion 8b of the tie rod body 8 slides and rotates in a direction corresponding to the horizontal force, and the tie rod body 8 takes a posture corresponding to the horizontal force, the tie rod body 8 is a steel sheet pile. The horizontal force acting on 3 can be transmitted to the reserve pile 5. Therefore, the horizontal displacement of the steel sheet pile 3 can be prevented.

  Further, even when a horizontal force is applied to the retaining pile 5, the flat portion 8b of the tie rod body 8 slides and rotates along the curved portion 7c of the U bolt 7, so that the tie rod body 8 is moved horizontally. Take a posture according to your power. Therefore, it is possible to prevent bending stress from being generated in the tie rod body 8 to prevent breakage, and to prevent horizontal displacement of the storage pile 5.

  Even when the steel sheet pile 3 is displaced so as to form a rotation angle with respect to the retaining pile 5, the flat portion 8b of the tie rod body 8 slides and rotates along the curved portion 7c of the U bolt 7, It takes a posture according to the rotation angle of the tie rod body 8. Therefore, it is possible to prevent a bending stress from being generated in the tie rod body 8 to prevent breakage, and to prevent displacement of the steel sheet pile 3.

  Thus, according to the reinforcement structure of the embankment concerning this embodiment, even if the displacement of the steel sheet pile 3 and the reserve pile 5 arises, both connection by the tie rod 6 is maintained. Moreover, since the storage pile 5 is driven deeply with respect to the steel sheet pile 3, even if the displacement of the steel sheet pile 3 occurs, the reinforcement by the storage pile 5 is maintained and the collapse of the wall body can be prevented.

  Further, according to the tie rod mounting structure of the present embodiment, the U bolts 7 and 7 are fixed to both fixing surfaces of the retaining pile 5 facing the steel sheet pile 3, and the tie rod main body 8 is flat to these U bolts 7 and 7. Since the part 8b is engaged, even if the steel sheet pile 3 and the retaining pile 5 are installed with the normals of the surfaces facing each other being inclined, the tie rod 6 can be passed over with a high degree of freedom. Moreover, since the number of parts of the tie rod 6 can be reduced as compared with the conventional case, the time for attaching the tie rod 6 can be reduced, and consequently, the construction cost of the revetment can be reduced.

  In the tie rod mounting structure of the present embodiment, the U bolts 7 and 5 are fixed to both the retaining pile 5, but the U bolt may be fixed to both the steel sheet pile 3 and the retaining pile 5.

  Further, the number of tie rod bodies attached to one U bolt is not limited to one, and a plurality of tie rod bodies can be inserted through one U bolt. In this case, it is preferable to design so that the resultant force of the tension applied to the plurality of tie rod bodies is balanced with the tension applied to the counterpart tie rod body.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can implement in another various aspect. For example, in the above-described embodiment, four through holes 5h are provided corresponding to the fixing surface of the flange portion of the retaining pile 5, but there are two through holes that are arranged obliquely at different height positions. However, the arrangement direction of the two through holes can be provided so as to be opposite to each other on the fixed surfaces on both sides.

  Further, the reserve pile 5 may not be an H-shaped rope, and can be widely used as long as it has a surface facing the steel sheet pile to which the U bolt is attached, such as a cylindrical member, on the front and back sides. .

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2 Embankment 3 Steel sheet pile 4 Wall body 5 Retaining pile 5h Through-hole 6 U-bolt of tie rod 7 8 Tie rod main body 9 Channel steel 10 Fixing screw 11 Fixing plate 13 Fixing plate 14 Nut 100 Ground

Claims (5)

A pair of wall bodies installed at intervals inside the embankment provided on the ground, and a column member that is inserted into the ground and is erected between the pair of wall bodies, the column member In the reinforcement structure of the embankment in which the wall body is connected with a tie rod,
The tie rod has a U-shaped fixing tool screwed to the support member and an engaging portion having a through-hole through which the fixing tool can be inserted, and the fixing tool is inserted. And a tie rod body that is slidably and rotatably coupled along the fixture.
The support member has fixing holes arranged obliquely on both fixing surfaces facing the pair of wall bodies and into which the leg portions of the fixture are inserted, and is provided on both the fixing surfaces. The embankment reinforcement structure, wherein the fixing holes are provided so that the arrangement directions are opposite to each other.   2. The embankment reinforcement structure according to claim 1, wherein the fixing tool of the tie rod is screwed to the support member so that a central axis is common.   The embankment reinforcing structure according to claim 1, wherein the support member includes a fixing plate attached along the fixing surface and having an insertion hole provided in the same array as the fixing hole. . Four fixing holes of the support member are arranged in a lattice shape at positions corresponding to each other on both fixing surfaces,
The said fixing tool is inserted in the fixing hole located diagonally of each said fixing surface, and is fixed in the state which penetrated both said fixing surfaces, It is any one of Claim 1 to 3 characterized by the above-mentioned. The embankment reinforcement structure described.   The embankment reinforcement structure according to any one of claims 1 to 4, wherein the support member is formed of an H-shaped rope.

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