JP2015221994A - Embankment reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embankment reinforcing structure capable not only of improving the overall strength of the embankment by connecting hold-down members with connection members, but also significantly enhancing the workability by placing the hold-down members almost linearly in the ground without connecting them by welding or other means, as well as significantly enlarging the reinforced area and being environment-friendly.SOLUTION: An embankment reinforcing structure 7 of the present invention is applied to an embankment having a first slope surface a and a second slope surface b, and includes a first hold-down member 1 and a second hold-down member 2 installed along the first slope surface a and the second slope surface b, and a plurality of connecting members 5, 6 that connect the first hold-down member 1 and the second hold-down member 2. The first hold-down member 1 and the second hold-down member 2 have slope surface parts Ca, Cb installed on the first slope surface a and the second slope surface b and embedded parts Ta, Tb buried in the ground, and the slope surface parts Ca, Cb are formed continuously with the embedded parts Ta, Tb, almost linearly.

Description

  The present invention relates to an embankment reinforcement structure applied to embankments such as river embankments, roads, and railways.

  Conventionally, due to the occurrence of a large-scale earthquake, even if the direct foundation board of the embankment built on the ground has been liquefied, it has been suspended even while allowing some deformation or collapse of the embankment itself. The embankment reinforcement structure disclosed by patent documents 1-3 is proposed for the purpose of not having it.

  For example, the embankment reinforcement structures disclosed in Patent Documents 1 and 2 are rooted in the ground where the balance of earth pressure is ensured by penetrating the embankment in the height direction at the shoulders of both slopes of the embankment. An underground steel wall as a sheet pile wall having a depth to be inserted is used.

  The embankment reinforcement structure disclosed in Patent Document 1 arranges underground steel wall bodies so that there are two rows in the continuous direction of the embankment, and connects the heads of these two rows of underground steel wall bodies with tie rods. It becomes the embankment reinforcement structure. The embankment reinforcement structure disclosed in Patent Document 1 suppresses the settlement of the embankment during an earthquake, and the underground steel wall body secures the embankment height as the embankment, thereby attempting to ensure the function as a dike. To do.

  The embankment reinforcement structure disclosed in Patent Document 3 focuses on reinforcement of the embankment itself, and a restraining member is installed on the two-way surface of the embankment, and two connecting members (tie rods) are connected to the restraining member. The connection structure is as described above, and tension may be introduced into this connecting member. Furthermore, the embankment reinforcement structure disclosed in Patent Document 3 proposes a structure in which a rooting member is separately placed on the butt and the holding member and the rooting member are joined by welding or the like.

  Since the embankment reinforcement structure disclosed in Patent Document 3 is provided with restraining members on both slopes of the embankment, it can be expected to suppress collapse of the embankment slope, and the restraining members are connected by a connecting member. Therefore, suppression of lateral deformation of the embankment itself can also be expected. Therefore, the embankment reinforcement structure disclosed in Patent Document 3 leads to the prevention of the deterioration of the proof stress of the underground steel wall body due to the collapse of the dike inner slope due to flooding during flooding and the scouring of the dike inner slope. Become.

JP 2003-13451 A JP 2011-214254 A JP 2008-25222 A

  However, as shown in FIG. 7, the embankment reinforcement structure 9 disclosed in Patent Document 1 increases the flow rate of the river K outside the bank and causes flooding, etc. When the surface flows, the slope of the embankment M may collapse and a secondary disaster may occur, and the dam inner slope will be scoured, resulting in a decrease in the yield strength of the underground steel wall body. There was a problem of fear.

  In response to these problems, for example, in the embankment reinforcement structure disclosed in Patent Document 2, a steel continuous wall body (steel sheet piles, etc.) is used as an oblique member on the inner slope of the embankment, and then against the embankment. A construction method in which a steel continuous wall body is inserted in the vertical direction with at least one shoulder is proposed. However, in the embankment reinforcement structure disclosed in Patent Document 2, since the heads of both steel continuous wall bodies (steel sheet piles, etc.) are not connected by tie rods, the embankment direct foundation board is liquefied when an earthquake occurs. There is a concern that the embankment slope of both sides will collapse and the center of the embankment (top edge section) will also collapse, for example, when a side flow occurs.

  For this reason, in the embankment reinforcement structure indicated by patent documents 2, since both embankment slope parts and embankment central part (top end section) may collapse, the settlement amount suppression effect of the whole embankment is notable. If there is a road surface at the top edge that cannot be expected, the top of the embankment will collapse due to the occurrence of an earthquake, and the road surface condition will be significantly worsened, making it impossible to pass emergency vehicles, etc. There was a problem that there was.

  Moreover, although the embankment reinforcement structure disclosed by patent document 3 is equipped with the control member installed in the slope of both sides of embankment, and the rooting member separately installed in the slope of both sides of embankment, Since the slope restraining member and the embedding member of the embankment of the embankment are constructed and installed independently, the construction time becomes very long due to the increased labor of on-site welding and the installation and placement of members. As a result, the construction cost becomes high.

  In addition, the embankment reinforcement structure disclosed in Patent Document 3 has a concern that the environmental load increases due to the continuation of the noise time during construction and the increase in carbon dioxide emission accompanying construction due to the construction time becoming longer. In addition, since the piercing member is driven in the vertical direction at the tail end, there is a problem that the area where the embankment reinforcement effect is obtained is also limited to the embankment.

  Furthermore, the embankment reinforcement structure disclosed in Patent Document 3 proposes a reinforcement structure in which the rooting member is placed obliquely toward the center of the embankment in addition to the reinforcement structure in which the rooting member is placed in the vertical direction. However, even in this reinforcing structure, although the effect of suppressing settlement in the vertical direction of the embankment can be expected, there is a problem that the region where the embankment reinforcing effect can be obtained is limited to the embankment.

  Therefore, the present invention is a structure in which the embankment is reinforced with a restraining member, the embedding of the embankment itself is suppressed, the workability is very excellent, the environment is friendly, and the embedding reinforcement area is significantly increased. An object is to provide a reinforcing structure.

  In order to solve the above-mentioned problem, the embankment reinforcement structure according to the first invention is an embankment reinforcement structure applied to a embankment having a first slope and a second slope, and the first slope. And a first restraining member and a second restraining member provided along the second slope, and a plurality of connecting members that connect the first restraining member and the second restraining member, The first restraining member and the second restraining member each have a slope portion disposed on the first slope and the second slope, and a root portion embedded in the ground, The slope portion and the root portion are continuously formed in a substantially straight line.

  The embankment reinforcement structure according to a second aspect of the present invention is the first aspect of the present invention, wherein the plurality of connecting members are substantially vertical cross sections with respect to the continuous direction of the embankment, and are a pair of the first restraining member and the second restraining member. A prestress in a tensile direction is introduced and provided over at least two upper and lower stages inside the sandwiched embankment.

  The embankment reinforcement structure according to a third aspect of the present invention is the embedding structure according to the second aspect, wherein the plurality of connecting members are such that the upper connecting members are covered with concrete, and prestress in the compression direction is introduced into the concrete covering the connecting members. It is characterized by being.

  The embankment reinforcement structure according to a fourth aspect of the present invention is the first aspect of the present invention, wherein the plurality of connection members are substantially vertical cross sections with respect to the continuous direction of the embankment, and are a pair of the first restraining member and the second restraining member. A crossing portion is formed that intersects at an intermediate portion inside the sandwiched embankment, and is provided with prestress in a tensile direction being introduced.

  The embankment reinforcement structure according to a fifth aspect of the present invention is any one of the first to fourth aspects of the present invention, wherein the restraining member is a steel sheet pile or a steel pipe sheet pile, and the steel sheet pile or the steel pipe sheet pile is in a continuous direction of the embankment. A plurality of the steel sheet piles or the steel pipe sheet piles adjacent to each other in the continuous direction of the embankment are connected to each other or provided at intervals.

  In the embankment reinforcement structure according to a sixth aspect of the present invention, in any one of the first to fifth aspects, the suppression member is formed with one or a plurality of water passage holes penetrating in a plate thickness direction in the root insertion portion. It is characterized by.

  The embankment reinforcement structure according to a seventh aspect of the present invention is the banking structure according to any one of the first to sixth aspects of the present invention, wherein the restraining member is a slip prevention member that protrudes toward the inside of the embankment at the slope portion, and the ground at the rooting portion. Any one or both of the stopper members protruding inward are provided.

  According to the first invention, both slopes of the embankment are protected by the restraining member, and the slope of the embankment can be prevented from collapsing during an earthquake or flood. Since the restraining member is driven in a straight line along the slope, there is no need for on-site welding or the like, and the construction time is shortened. As a result, the construction cost is very low. In addition, shortening the construction time can be expected to shorten the noise time during construction and to reduce carbon dioxide emissions associated with construction, leading to a reduction in environmental burden. Furthermore, since the restraining member is slanted in a substantially straight line, the cross-sectional area in the substantially vertical section in the continuous direction of the embankment surrounded by both restraining members increases, and the reinforcing region by the restraining member is significantly enlarged. be able to.

  According to the second invention, both slopes of the embankment are protected by the restraining member, and it is possible not only to suppress the collapse of the slope of the embankment during an earthquake or flood, but also to all or some of the connecting members. In order to give prestress, the embedding ground will be restrained and the effective stress will increase, leading to the suppression of collapse of the embankment itself.

  According to the third invention, the upper part of the connecting member has a prestressed concrete structure, and the restraining force by the lower connecting member increases the effective stress of the embankment internal ground, and in addition to suppressing collapse of the embankment itself, the upper connecting member is compressed.・ Because it can resist the acting force of bending, collapse of the embankment itself can be further suppressed. In addition, since the upper connecting member is covered with concrete, the alkali component of the concrete forms a passive film on the surface of the connecting member and exhibits a corrosion prevention function.

  According to the fourth aspect of the present invention, it is possible to cancel the restraining force in the vertical direction generated in the restraining member by introducing the prestress by crossing the connecting members, and the restraining member along the first slope and the second slope. Since the component force of the restraining force to be moved upward is reduced and eliminated, a larger prestress can be introduced into the connecting member. Further, even when the embankment road surface collapses due to an earthquake or the like, it is possible to prevent the connecting member from being exposed on the road surface and to prevent the emergency vehicle from being hindered.

  According to the fifth invention, since a plurality of restraining members are installed at intervals along the continuous direction of the embankment, the number of times of placing the restraining member is reduced, the construction time is shortened and the workability is improved, The amount of steel used for the restraining member can also be reduced. Moreover, since the suppressing member is driven at intervals, water permeability can be secured, and the embankment reinforcement structure that does not hinder the flow of groundwater on the embankment direct base plate can be obtained.

  According to the sixth aspect of the present invention, a water passage hole is formed in the base portion of the restraining member, and the water permeability can be ensured by the water passage hole. There can be no embankment reinforcement structure.

  According to the seventh aspect of the present invention, when prestress is introduced into the connecting member, the restraining force that moves the restraining member upward along the first slope and the second slope caused by the introduction of the prestress. In addition to the frictional force of the restraining member, it can be processed with the resistance force of the protruding shape of the slip prevention member, and the settlement of the vertical method of the embankment can be further suppressed.

  According to the present invention, not only can the strength of the whole embankment be increased by connecting the restraining member with the connecting member, but the restraining member can be made into one substantially straight line in the ground without joining the restraining member by welding or the like. By placing, it is possible to provide an embankment reinforcement structure that is extremely excellent in workability, significantly increases the reinforcement area, and is also environmentally friendly.

It is a schematic sectional drawing which shows the embankment reinforcement structure which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing which shows the embankment reinforcement structure which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing which shows the embankment reinforcement structure which concerns on 3rd Embodiment of this invention. It is a schematic perspective view which shows the embankment reinforcement structure which concerns on 4th Embodiment of this invention. (A) is a schematic sectional drawing which shows the modification of the embankment reinforcement structure to which this invention is applied, (b) is an expansion perspective view which shows the water flow hole of the suppression member. (A) is a schematic sectional drawing which shows the other modification of the embankment reinforcement structure to which this invention is applied, (b) is an expansion perspective view which shows the slip prevention member of the suppression member. It is a schematic sectional drawing which shows the embankment which has the conventional embankment reinforcement structure at the time of flooding by flood.

  Hereinafter, the form for implementing the embankment reinforcement structure 7 to which this invention is applied is demonstrated in detail, referring drawings.

  The embankment reinforcement structure 7 to which the present invention is applied is introduced into the embankment M constructed on the ground, for example, as a bank K dike. FIG. 1 shows a substantially vertical cross section with respect to the continuous direction of the embankment M in the embankment reinforcement structure 7 according to the first embodiment. Here, the embankment M is constructed by extending in a continuous direction across the left and right of the embankment M, and as shown in FIG. 1, the first slope a (the slope facing the river K) and the left and right of the embankment M, and A second slope b (a slope opposite to the river K) is formed.

  The embankment reinforcing structure 7 to which the present invention is applied includes a first restraining member and a second restraining member, a first restraining member, and a second restraining member provided along the first slope a and the second slope b. And a plurality of connecting members connecting the members. As the connecting member, tie rods 5, 6 and a PC steel rod are used.

  In the embankment reinforcing structure 7 to which the present invention is applied, steel sheet piles 1 and 2 such as a hat-shaped steel sheet pile having a substantially hat-shaped cross section are used as the first restraining member and the second restraining member. The embankment reinforcing structure 7 to which the present invention is applied is not limited to this, and as a first restraining member and a second restraining member, a U-shaped steel sheet pile having a substantially U-shaped cross section, a Z-shaped steel sheet pile having a substantially Z-shaped cross section, etc. Steel sheet piles 1 and 2 and steel pipe sheet piles are used, and these steel sheet piles 1 and 2 and steel pipe sheet piles may be used in combination as necessary.

  In the embankment reinforcing structure 7 to which the present invention is applied, the steel sheet pile walls 3 and 4 are constructed by connecting a plurality of steel sheet piles 1 and 2 in the continuous direction of the embankment M. The steel sheet piles 1 and 2 are a first slope a and a second slope b of the embankment M, and are separated from each other as the distance from the top edge U of the embankment M increases. The upper ends of the steel sheet piles 1 and 2 are positioned at a height that is near the height of the top edge U of the embankment M.

  The steel sheet piles 1 and 2 are roots that are embedded and embedded in the slopes Ca and Cb, which are arranged so as to contact the first slope a and the second slope b, and the local board 8 (the ground below the embankment). The slope portions Ca and Cb and the root insertion portions Ta and Tb are continuously formed in a substantially linear shape with the insertion portions Ta and Tb. The lengths of the root insertion portions Ta and Tb are long enough to ensure a balance of earth pressure acting on the slope portions Ca and Cb and the root insertion portions Ta and Tb. In consideration of the stability of the steel sheet pile walls 3 and 4 after placing, the steel sheet piles 1 and 2 preferably have the lengths of the roots Ta and Tb longer than the lengths of the slope portions Ca and Cb.

  The steel sheet pile walls 3 and 4 are constructed by connecting the steel sheet piles 1 and 2 adjacent in the continuous direction of the embankment M by fitting the joint portions of the steel sheet piles 1 and 2. The steel sheet pile walls 3 and 4 are not limited to this, and the steel sheet piles 1 and 2 adjacent to each other in the continuous direction of the embankment M are constructed with a predetermined interval in the continuous direction of the embankment M. May be. The steel sheet pile walls 3 and 4 are provided at a plurality of locations by connecting two or more steel sheet piles 1 and 2 in the continuous direction of the embankment M, and the steel sheet pile walls 3 and 4 at the plurality of locations are It may be provided with a predetermined interval in the continuous direction.

  In the embankment reinforcing structure 7 according to the first embodiment, a part or all of the steel sheet pile walls 3 and 4 installed on the first slope a and the second slope b are connected members. They are connected by some tie rods 5 and 6. The tie rods 5, 6 connect the upper and lower portions of the pair of steel sheet piles 1, 2 in the width direction X of the embankment M, respectively, and form a pair in a substantially vertical cross section with respect to the continuous direction of the embankment M. It is provided over at least two upper and lower stages inside the embankment sandwiched between the restraining member and the second restraining member, and is provided to connect a plurality of steel sheet piles 1 and 2 in the continuous direction of the embankment M.

  In the embankment reinforcement structure 7 to which the present invention is applied, the prestress in the tensile direction is introduced to all or a part of the tie rods 5 and 6 toward the outside in the width direction X of the embankment M, so that the width of the embankment M is increased. The restraining force toward the center in the direction X is sufficiently given to the embankment M. Thereby, as for the embankment reinforcement structure 7 to which this invention is applied, the effective stress inside the embankment sandwiched between the first restraining member and the second restraining member paired in the width direction X of the embankment M increases. In addition, the embankment M can exhibit sufficient shear strength, and the reinforcing effect of the entire embankment A can be obtained, and even if an earthquake occurs, the embankment M can be largely prevented from subsidence.

  Moreover, the embankment reinforcement structure 7 to which this invention is applied has the diagonal steel sheet pile walls 3 and 4 which connected the steel sheet piles 1 and 2 to the continuous direction of the embankment M, etc., and the 1st slope a and the 2nd slope b. This embankment M can be used as a dike. Thereby, the embankment reinforcement structure 7 to which the present invention is applied has an oblique steel sheet pile by arranging the steel sheet pile wall 4 along the second slope b even if the river K overflows during flooding. Since the second slope b is protected by the wall 4, it is possible to prevent the second slope b from collapsing due to the water flow that has overflowed.

  Moreover, the embankment reinforcement structure 7 to which the present invention is applied is such that the steel sheet piles 1 and 2 are inclined in a substantially straight line so that the cross section is substantially perpendicular to the continuous direction of the embankment M, and the width direction X of the embankment M The cross-sectional area D of the embankment and the local board 8 sandwiched between the first holding member and the second holding member that are paired with each other can be increased. Thereby, the embankment reinforcement structure 7 to which the present invention is applied ensures a wide area in which the steel sheet piles 1 and 2 are embedded in the local board 8 in the width direction X of the embankment M, so that the first restraining member and the first It becomes possible to expand the reinforcement region of the embankment M by the restraining member 2 and make the reinforcement of the embankment M sufficient.

  Furthermore, the embankment reinforcement structure 7 to which the present invention is applied has the slope portions Ca and Cb of the steel sheet piles 1 and 2 because the slope portions Ca and Cb and the root insertion portions Ta and Tb are continuously formed in a substantially straight line. Construction time can be shortened as what does not require joining work, such as on-site welding for connecting Nd and the penetration part Ta and Tb. As a result, the embankment reinforcement structure 7 to which the present invention is applied does not require on-site welding or the like, and the construction cost when the steel sheet piles 1 and 2 are provided on the embankment M can be made very inexpensive. In addition, since the construction time is shortened, it is possible to reduce the environmental load by shortening the noise time during construction and reducing the carbon dioxide emission accompanying the construction.

  Next, a second embodiment of the present invention will be described. FIG. 2 shows a substantially vertical cross section with respect to the continuous direction of the embankment M in the embankment reinforcement structure 7 according to the second embodiment. As shown in FIG. 2, the embankment reinforcing structure 7 according to the second embodiment has a substantially vertical cross section with respect to the continuous direction of the embankment M, and the embankment sandwiched between a pair of first restraining member and second restraining member. Inside, the tie rods 5 and 6 are crossed, and an intersection R of the tie rods 5 and 6 is formed at an intermediate portion such as a substantially center inside the embankment.

  In the embankment reinforcing structure 7 according to the second embodiment, a part or all of the steel sheet pile walls 3 and 4 installed on the first slope a and the second slope b are connected members. They are connected by some tie rods 5 and 6. The tie rod 5 connects the upper part of the steel sheet pile 1 and the lower part of the steel sheet pile 2, and the tie rod 6 connects the lower part of the steel sheet pile 1 and the upper part of the steel sheet pile 2, so that In the vertical cross section, the steel sheet piles 1 and 2 are provided in at least two upper and lower stages inside the embankment sandwiched between the pair of first restraining member and second restraining member, and in the continuous direction of the embankment M. Are provided to connect the two.

  The tie rods 5 and 6 are inclined in the width direction X of the embankment M, and a prestress in the tensile direction is introduced, so that the restraint force toward the center of the embankment M in the width direction X is sufficiently applied to the embankment M. It will be a thing. Since the tie rods 5 and 6 intersect at the intersection R, the tie rod 5 receives a restraining force directed downward from the upper portion of the steel sheet pile 1 and a restraining force directed upward from the lower portion of the steel sheet pile 2. Moreover, in the tie rod 6, a restraining force directed upward from the lower part of the steel sheet pile 1 acts, and a restraining force directed downward from the upper part of the steel sheet pile 2 acts.

  At this time, in the embankment reinforcement structure 7 according to the second embodiment, the binding force in the vertical direction of the steel sheet piles 1 and 2 acts on each of the tie rods 5 and 6, so that the height M in the height direction Y of the embankment M is increased. The binding force will cancel each other. In the embankment reinforcement structure 7 according to the second embodiment, the steel sheet piles 1 and 2 are moved upward along the first slope a and the second slope b by canceling out the restraining forces in the height direction Y of the fill M. It becomes possible to reduce or eliminate the component force of the binding force to be moved.

  The embankment reinforcement structure 7 according to the second embodiment reduces and extinguishes the component force of the binding force that attempts to move the steel sheet piles 1 and 2 upward along the first slope a and the second slope b. Therefore, a greater prestress in the tensile direction is introduced into the tie rods 5 and 6 without moving the steel sheet piles 1 and 2 along the first and second slopes a and b. be able to. Thereby, the embankment reinforcement structure 7 which concerns on 2nd Embodiment introduce | transduces the prestress of a bigger tension | tensile_strength into the tie rods 5 and 6, makes the embankment M exhibit sufficient shear strength, and reinforces the whole embankment A The effect can be remarkably improved.

  In the embankment reinforcing structure 7 according to the second embodiment, since the tie rods 5 and 6 intersect at the intersecting portion R, the intersecting portion R of the tie rods 5 and 6 is located at a deep position separated from the top end U of the embankment M. It will be provided. Thereby, the embankment reinforcement structure 7 according to the second embodiment is provided with the tie rods 5 and 6 at a deep position separated from the top end U of the embankment M, so that the embankment straight foundation board liquefies during an earthquake, and the embankment straight foundation board Even when the top flow U of the embankment M occurs and the top edge U of the embankment M collapses, the tie rods 5 and 6 are prevented from being exposed on the road surface of the top edge U of the embankment M. It is possible to ensure the passage of emergency vehicles on the road surface of the top end U of the vehicle.

  Next, the construction method of the embankment reinforcement structure 7 which concerns on 1st Embodiment and 2nd Embodiment is demonstrated.

  The construction method of the embankment reinforcement structure 7 to which the present invention is applied is as follows. First, the steel sheet piles 1 and 2 are placed on the local board 8 (in accordance with the first slope a and the second slope b of the existing or new embankment M. It will be placed in the ground below the embankment to penetrate to the desired depth. Next, the ground of the embankment M is excavated from the top U of the embankment M in the vertical direction using a backhoe or the like, and a space for providing the tie rods 5 and 6 is secured. If the steel sheet pile walls 3 and 4 are not self-supporting when excavating the embankment M, use temporary materials such as kerfs and belly on the upper part of the steel sheet pile walls 3 and 4 installed on both slopes. The steel sheet pile walls 3 and 4 are supported and made independent.

  Thereafter, the ends of the tie rods 5 and 6 are inserted into holes in the steel sheet piles 1 and 2 formed by drilling at the factory or on-site, and fixed using fixing nuts, box hardware, or the like (not shown). Is done. If there is a concern about the intrusion of water from the tie rod installation holes formed in the steel sheet piles 1 and 2, a box metal and a fixing nut are welded to the river side surface of the steel sheet pile 1 of the first slope a in advance. In this case, it is desirable to stop water in the hole for installing the tie rod (not shown).

  When high water pressure acts on a large river, etc., a temporary earth retaining wall is installed in the river to prevent the inflow of water from the river K and to fix the ends of the tie rods 5 and 6 Alternatively, the fixing operation of the end portions of the tie rods 5 and 6 can be performed at a time when the amount of river water is small, such as a drought time. In the case where the tie rods 5 and 6 are used by connecting a plurality of divided tie rods, turnbuckles (not shown) may be used at the joints between the divided tie rods.

  In the construction method of the embankment reinforcing structure 7 to which the present invention is applied, after the tie rods 5 and 6 are provided, when the ground of the embankment M is backfilled, the ground is sufficiently compacted. The construction method of the embankment reinforcing structure 7 to which the present invention is applied is that the fixing nut of the steel sheet pile 2 installed on the second slope b is finally tightened with a hydraulic torque wrench or the like so that prestress is applied to the tie rods 5 and 6. By being introduced, a compressive force is introduced into the internal ground of the embankment M, and a restraining force toward the center in the width direction X of the embankment M is given to the embankment M.

  Next, a third embodiment of the present invention will be described. As shown in FIG. 3, the embankment reinforcement structure 7 according to the third embodiment is similar to the embankment reinforcement structure 7 according to the first embodiment, and the steel sheet pile 1 along the first slope a and the second slope b. 2 are connected by tie rods 5 and 6. In the embankment reinforcement structure 7 according to the third embodiment, in particular, the upper connecting member is covered with the concrete C, and prestress in the compression direction is introduced into the concrete C covering the connecting member.

  In the embankment reinforcing structure 7 according to the third embodiment, the concrete C is placed around the upper tie rod 5, and the tie rod 5 into which the prestress in the tensile direction is introduced is covered with the concrete C. By releasing the prestress of the tie rod 5, prestress in the compression direction is introduced into the concrete C after curing, and the concrete C around the upper tie rod 5 becomes the prestressed concrete structure P. The embankment reinforcement structure 7 according to the third embodiment is such that the concrete C around the upper tie rod 5 becomes a prestressed concrete structure P, so that the tensile strength is borne on the tie rod 5 and the concrete C has a predetermined bending strength and compression. It will be possible to bear proof stress.

  The embankment reinforcing structure 7 according to the third embodiment exhibits resistance in the compression direction and the bending direction with the concrete C around the upper tie rod 5. The embankment reinforcing structure 7 according to the third embodiment not only increases the effective stress of the inner ground of the embankment M by the restraining force of the lower tie rod 6 but also compresses the concrete C around the upper tie rod 5 in the compression direction, bending It is possible to suppress the collapse of the embankment M by exerting the restraining force in the direction and remarkably improving the proof stress of the embankment M.

  Further, the embankment reinforcing structure 7 according to the third embodiment covers the upper tie rod 5 with concrete C to form a prestressed concrete structure P. Therefore, in addition to the tensile force and compressive force acting during an earthquake, embankment Since the bending force generated by the deformation of M and the deformation of the steel sheet pile walls 3 and 4 can be resisted, the deformation of the steel sheet pile walls 3 and 4 and the embankment M can be suppressed. Moreover, the embankment reinforcement structure 7 which concerns on 3rd Embodiment is that the upper tie rod 5 is coat | covered with concrete C, and forms a passive film in the surface of the tie rod 5 with the alkaline component of concrete C, such as steel materials The anticorrosive effect for the tie rod 5 can be exhibited.

  Next, the construction method of the embankment reinforcement structure 7 which concerns on 3rd Embodiment is demonstrated.

  As for the construction method of the embankment reinforcement structure 7 to which the present invention is applied, first, regarding the lower tie rod 6, the steel sheet pile 1, as in the construction method of the embankment reinforcement structure 7 according to the first embodiment and the second embodiment, After the placement of 2, the ground of the embankment M is excavated, and the lower tie rod 6 is fixed. Then, after filling back to the position which becomes the lower surface of the prestressed concrete structure P and sufficiently compacting the ground, the lower tie rod 6 is tightened with a fixing nut to introduce a compressive force to the internal ground of the embankment M.

  With respect to the upper tie rod 5, first, the fixing nut installed at the end of the tie rod 5 is tightened with a hydraulic torque wrench or the like before placing the concrete, and a pre-stress is applied to the tie rod 5 in the tensile direction. After the concrete is hardened, the fixing nut at the end of the tie rod 5 is loosened to release the prestress. At this time, in the construction method of the embankment reinforcement structure 7 to which the present invention is applied, the prestressed concrete structure P in which the upper tie rod 5 is covered with the concrete C is constructed on the upper part of the embankment M.

  At this time, the construction method of the embankment reinforcement structure 7 to which the present invention is applied can form the top end U of the embankment M by backfilling the upper part of the prestressed concrete structure P with earth and sand as shown in FIG. Not only this but the upper surface of the prestressed concrete structure P may form the top end U of the embankment M.

  The construction method of the embankment reinforcement structure 7 to which the present invention is applied can significantly strengthen the reinforcement of the upper part of the embankment M by constructing the prestressed concrete structure P, and the top end U of the embankment M by an earthquake or the like. Even when the road surface collapses, it is possible to prevent the upper tie rod 5 from being exposed on the road surface.

  Next, a fourth embodiment of the present invention will be described. As shown in FIG. 4, the embankment reinforcement structure 7 according to the fourth embodiment is similar to the embankment reinforcement structure 7 according to the first embodiment. Two slopes b are cast in a substantially straight line along the first slope a and the second slope b so as to be spaced apart from the top edge U of the embankment M. The upper ends of the sheet piles 1 and 2 are positioned at a height that is near the height of the top edge U of the embankment M.

  The embankment reinforcement structure 7 which concerns on 4th Embodiment provides the steel sheet pile walls 3 and 4 by providing the steel sheet piles 1 and 2 adjacent to the continuous direction of the embankment M at predetermined intervals in the continuous direction of the embankment M. Is to be built. In addition, the embankment reinforcement structure 7 according to the fourth embodiment is provided with steel sheet pile walls 3 and 4 at a plurality of locations by connecting two or more steel sheet piles 1 and 2 adjacent to each other in the continuous direction of the embankment M. A plurality of steel sheet pile walls 3 and 4 may be provided at predetermined intervals in the continuous direction of the embankment M.

  In the embankment reinforcement structure 7 according to the fourth embodiment, since the plurality of steel sheet piles 1 and 2 are placed at intervals in the continuous direction of the embankment M, the number of placement of the steel sheet piles 1 and 2 is reduced, The construction time required for placing the steel sheet piles 1 and 2 can be shortened. Moreover, since the embankment reinforcement structure 7 which concerns on 4th Embodiment can also reduce the usage-amount of the steel materials used for the steel sheet piles 1 and 2, it becomes possible to reduce a construction cost significantly.

  Since the embankment reinforcement structure 7 according to the fourth embodiment is embedded so that the plurality of steel sheet piles 1 and 2 reach the supporting ground and the like, the ground piles Ta and Tb of the steel sheet piles 1 and 2 are embedded in the ground. A water permeable layer may be arranged. In the embankment reinforcement structure 7 according to the fourth embodiment, a plurality of steel sheet piles 1 and 2 adjacent to each other in the continuous direction of the embankment M are provided with a predetermined interval therebetween, so Therefore, it is possible to reduce the environmental load by passing the groundwater in the permeable layer so as not to hinder the flow of the groundwater in the permeable layer.

  In addition, the construction method of the embankment reinforcement structure 7 which concerns on 4th Embodiment is the same as the construction method of the embankment reinforcement structure 7 which concerns on 1st Embodiment and 2nd Embodiment.

  The embankment reinforcement structure 7 to which the present invention is applied is shown in FIG. 5 in any of the first to fourth embodiments, the steel sheet pile 1, One or a plurality of water passage holes H penetrating in the thickness direction of the two plates can be formed. The water passage hole H is drilled in a substantially circular shape so that the insertion portions Ta and Tb of a hat-shaped steel sheet pile, a steel pipe sheet pile, a U-shaped steel sheet pile, a Z-shaped steel sheet pile, etc. penetrate in the thickness direction. Thus, they are formed at substantially equal intervals along the slope direction.

  Thereby, the embankment reinforcement structure 7 to which the present invention is applied shall ensure water permeability through the water flow holes H of the steel sheet piles 1 and 2 and not impede the flow of groundwater in the water permeable layer in the local board 8. Therefore, it is possible to prevent the surrounding ecosystem and environment from deteriorating and to reduce the environmental load.

  The embankment reinforcement structure 7 to which the present invention is applied includes the slopes Ca and Cb of the steel sheet piles 1 and 2 and the steel sheet pile 1 as shown in FIG. 6 in any of the first to fourth embodiments. One or a plurality of anti-slip members Z such as a stat diver may be provided in one or both of the two root insertion portions Ta and Tb. The slip-preventing member Z is provided so as to protrude from one side of the steel sheet piles 1 and 2 toward the inside of the embankment at the slopes Ca and Cb of the steel sheet piles 1 and 2, In Tb, the steel sheet piles 1 and 2 are provided so as to protrude from both sides or one side of the steel sheet piles 8 toward the local board 8.

  The embankment reinforcement structure 7 to which the present invention is applied is such that prestress is introduced into the tie rods 5 and 6 so that the component force of the restraining force directed upward along the first slope a and the second slope b is steel. It acts on the sheet piles 1 and 2. The embankment reinforcing structure 7 to which the present invention is applied is provided with a slip-preventing member Z on the steel sheet piles 1 and 2, so that the frictional resistance force along the first slope a and the second slope b of the steel sheet piles 1 and 2 is provided. In addition, since the resistance force due to the protruding shape of the slip prevention member Z is added, the component force of the restraining force acting on the steel sheet piles 1 and 2 along the first slope a and the second slope b is upward. On the other hand, it is possible to reliably resist. Moreover, the embankment reinforcement structure 7 to which this invention is applied WHEREIN: The shift prevention member Z provided in the steel sheet piles 1 and 2 exhibits resistance with respect to the dead weight of the embankment M, etc., and the height direction of the embankment M It becomes possible to reliably prevent the settlement of Y.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such embodiments. It is obvious that a person having ordinary knowledge in the technical field to which the present invention belongs can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

1, 2: Steel sheet pile (restraining member)
Ca, Cb: Slope part Ta, Tb: Root insertion part R: Crossing part H: Water flow hole Z: Non-slip member 3, 4: Steel sheet pile wall 5, 6: Tie rod (connection member)
7: Embankment reinforcement structure M: Embankment U: Top edge of embankment a: First slope b: Second slope A: Whole bank C: Concrete P: Prestressed concrete structure 8: Local board K: River X: Width direction Y : Height direction

Claims (7)

A embankment reinforcement structure applied to a embankment having a first slope and a second slope,
A plurality of connections connecting the first restraining member and the second restraining member, and a first restraining member and a second restraining member provided along the first slope and the second slope; With members,
The first restraining member and the second restraining member have a slope portion disposed on the first slope and the second slope, and a root portion embedded in the ground, The embankment reinforcing structure, wherein the slope portion and the root portion are continuously formed in a substantially straight line. The plurality of connecting members have a substantially vertical cross section with respect to the continuous direction of the embankment, and are stretched over at least two upper and lower stages inside the embankment sandwiched between the pair of the first restraining member and the second restraining member. The embankment reinforcing structure according to claim 1, wherein prestress in a direction is introduced and provided. 3. The embankment reinforcement according to claim 2, wherein the plurality of connecting members are such that the upper connecting members are covered with concrete, and prestress in the compression direction is introduced into the concrete covering the connecting members. Construction. The plurality of connecting members have a substantially vertical cross section with respect to the continuous direction of the embankment, and form an intersecting portion that intersects at an intermediate portion inside the embankment sandwiched between the pair of the first restraining member and the second restraining member. The embankment reinforcement structure according to claim 1, wherein prestress in a tensile direction is introduced and provided. As the restraining member, a steel sheet pile or a steel pipe sheet pile is used. The embankment reinforcement structure according to any one of claims 1 to 4, wherein the embankment reinforcement structure is connected or spaced apart. The embankment reinforcement structure according to any one of claims 1 to 5, wherein the holding member is formed with one or a plurality of water passage holes penetrating in a plate thickness direction in the root portion. The restraining member is provided with any one or both of an anti-slip member that protrudes toward the inside of the embankment at the slope portion and an anti-slip member that protrudes toward the ground at the rooting portion. The embankment reinforcement structure according to any one of claims 1 to 6.

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