JP5805547B2 - Road reinforcement structure and reinforcement method - Google Patents

Description

  The present invention relates to a road reinforcing structure and a reinforcing method.

  On roads (including on-premise roads), ensuring the passage of emergency vehicles such as fire engines and ambulances at the time of an earthquake, especially immediately after the earthquake, is extremely important in preventing the spread of earthquake damage. However, in past earthquakes, steps and irregularities are generated on the road surface, and a situation that hinders emergency vehicle traffic has occurred. In order to prevent the occurrence of such a road step or unevenness, it is effective to provide a reinforcing body having bending rigidity below the road surface. As the reinforcing body having bending rigidity, for example, the technique of Patent Document 1 below can be used. In Patent Document 1, it is proposed that a flexible hose is attached to a flexible sheet and laid on the ground, and a mortar is filled in a cloth hose to form a cylindrical rigid reinforcement. Yes.

  This rigid reinforcing body has bending resistance because the cured mortar has compression resistance and the hose has tensile resistance. In addition, because the hose's tensile resistance also acts in the circumferential direction of the hose, the hose does not loosen on the compression side of the bend and the mortar is restrained. There is little decrease. Therefore, if this rigid reinforcing body is installed in the road floor or the road bed, the level difference and unevenness of the road surface can be suppressed. As a general construction method, for example, after arranging a plurality of rigid reinforcement bodies on the ground, a crushed stone layer is constructed as a roadbed, and an asphalt mixture is further constructed to complete the pavement. Instead of the cloth hose in the above sentence, a hose or a cylindrical member other than cloth (paper, synthetic resin, metal, wood, bamboo, etc.) may be used.

Japanese Patent No. 3729169

  The rigid reinforcement body of patent document 1 is proposed as a method for reinforcing the surface layer of mud-like soft ground. Strengthening roads as a countermeasure against earthquakes requires higher strength than soft ground reinforcement. In order to enhance the effect of suppressing the level difference and the unevenness, it is effective to increase the bending rigidity per unit depth in the arrangement direction. Therefore, it is desirable to arrange the rigid reinforcements as closely as possible. In particular, the method of arranging the rigid reinforcing bodies in close contact with each other with zero spacing (hereinafter referred to as “contact arrangement”) is the most effective. (Furthermore, it is conceivable to arrange in multiple layers in the vertical direction.) In the case of the close-contact arrangement, the upper and lower sides are completely isolated by the rigid reinforcement, so the sheet used in the method of Patent Document 1 is omitted. Also good.

  In the normal construction method in which granular materials such as earth and sand and crushed stone are spread and compacted, it becomes more difficult to fill the lower surface of the rigid reinforcement body with granular material as the arrangement interval of the rigid reinforcement bodies becomes narrower. There may be a gap left on the lower surface side of the body due to insufficient filling (case 1). In particular, in the close contact arrangement, a space that is not filled with anything remains below the rigid reinforcement (case 2).

  In case 1, there is a concern that after the construction is completed, the granular material falls from above into the gap that remains due to insufficient filling, causing a road surface depression. In addition, when the lower ground below the rigid reinforcement body is a ground with a large gap such as a rock crushing embankment, after the construction is completed, the granular material may fall into the gap in the lower ground, which may similarly cause road surface depression. . In this way, the phenomenon that the granular material falls downward after the completion of the construction is hereinafter referred to as “dropping of the granular material”.

  In Case 2, load transmission from the rigid reinforcement body to the ground is limited to the ground contact portion at the lower end of the rigid reinforcement body, and the rigid reinforcement body, pavement, and traffic loads all act on the installation section. There is a possibility that the reinforcing body will bite into the ground and sink, leading to the sinking of the road surface.

  In addition, as described above, the incomplete filling of the granular material around the rigid reinforcement body causes a problem that the adhesion between the rigid reinforcement body and the ground is weak, and sliding is likely to occur. There is a problem that the road surface unevenness tends to occur in the arrangement direction. As described above, in order to use the rigid reinforcing body as a countermeasure for steps and unevenness, there are problems of preventing the granular material from dropping, preventing the rigid reinforcing body from biting into the ground, and integrating the rigid reinforcing bodies.

  In view of this problem, according to the present invention, in reinforcement of a road in which reinforcing bodies are arranged, prevention of dropping of granular material, prevention of biting of the reinforcing body into the ground, and further integration of the reinforcing bodies can be achieved. An object is to provide a reinforcing structure and a reinforcing method.

  The road reinforcement structure of the present invention includes a plurality of reinforcement bodies arranged in the basement of the road and extending in a predetermined direction, and a reinforcement body fixing portion that fixes the positional relationship between the reinforcement bodies in the arrangement direction. The body includes a first bag body extending in a predetermined direction, and a first compression resistor formed by filling the first bag body with a first fluid filler. The reinforcing body fixing portion has a second compression resistor formed by filling the second fluid filler between the reinforcing bodies.

  According to this reinforcing structure, the second compression resistor exists between the plurality of reinforcing bodies. Since the second compression resistor is formed by filling the second fluid filler between the reinforcing members, the second fluid filling is performed in accordance with the shape of the gap between the reinforcing members. Sufficient material is distributed. Therefore, according to this reinforcement structure, the clearance gap between reinforcement bodies can be filled appropriately. As a result, it is possible to prevent the granular material from dropping, prevent the reinforcement body from biting into the ground, and further integrate the rigid reinforcement bodies.

  The reinforcing body fixing portion is formed by filling the second fluid filler in the gap between the plurality of reinforcing bodies inside the second bag body that houses the plurality of reinforcing bodies, and the second bag body. It is good also as having the 2nd compression resistor made.

  According to this reinforcing structure, since the plurality of reinforcing bodies are accommodated in the second bag body, by injecting the second fluid filler into the second bag body, between the reinforcing bodies. The fluid filler is properly distributed, and the gap between the reinforcing bodies is appropriately filled with the second compression resistor. In addition, since the second fluid filler is filled in the second bag body, it is possible to avoid the fluid filler from penetrating into the lower layer.

  The reinforcing body fixing portion is inserted between the reinforcing bodies, the second bag body extending substantially parallel to the reinforcing bodies, and the second bag body is filled with the second fluid filler. It is good also as having the 2nd compression resistor formed in this way, and the binding body which binds reinforcement bodies in the sequence direction.

  According to this reinforcing structure, by injecting the second fluid filler into the second bag body between the reinforcing bodies, the second bag body swells in accordance with the shape of the gap between the reinforcing bodies, The gap between the reinforcing bodies is appropriately filled by the second compression resistor.

  Moreover, the road exists on the discontinuous structure boundary line which is a boundary line between discontinuous underground structures, and a reinforcement body is good also as extending in the direction which crosses a discontinuous structure boundary line. When the road is on a discontinuous structure boundary line, a road step is likely to occur along the discontinuous structure boundary line during an earthquake or the like. Therefore, by installing the reinforcing body so as to cross the boundary line of the discontinuous structure, it is possible to appropriately suppress the generation of a road surface step during an earthquake.

  Specifically, the second fluid filler may be made of a curable material, and the second compression resistor may be formed by curing the second fluid filler.

  The road reinforcement method of the present invention includes a bag body installation step of installing a plurality of first bag bodies extending in a predetermined direction on a ground below a road, and a first bag body inside the first bag body. A first bag filling step for filling the fluid filler, a gap filling step for filling the gap between the first bag bodies with the second fluid filler after the first bag filling step, and a first And a roadbed forming step of placing a roadbed material on the bag body to form a roadbed below the road. According to this method, the above-described road reinforcement structure can be efficiently constructed.

  The road reinforcement method of the present invention includes a bag body installation step in which a second bag body containing a plurality of first bag bodies extending in a predetermined direction is placed on the ground below the road, After the first bag filling step of filling the inside of the bag body with the first fluid filler and the first bag filling step, the first bag body is inserted into the gap between the first bag bodies inside the second bag body. A second bag body filling step of filling the fluid filler of 2 and a roadbed forming step of placing a roadbed material on the second bag body to form a roadbed under the road, To do. According to this method, the above-described road reinforcement structure can be efficiently constructed.

  In the road reinforcing method of the present invention, a plurality of first bags extending in a predetermined direction and second bags disposed between the first bags are arranged substantially in parallel. A bag body installation step that is installed on the ground below the road in a bundled state, a first bag body filling step that fills the inside of the first bag body with a first fluid filler, and a first bag body filling After the step, a second bag filling step of filling the second bag body with the second fluid filler, and a roadbed material under the road by placing the roadbed material on the first and second bag bodies And a roadbed forming step of forming According to this method, the above-described road reinforcement structure can be efficiently constructed.

  The road reinforcing method according to the present invention includes a recess forming step for forming a recess in the ground below the road, and a plurality of first bags extending in a predetermined direction in a state in which the plurality of first bags are arranged substantially in parallel. After the bag body installation step, the first bag body filling step for filling the first bag body with the first fluid filler, and the first bag body filling step, the concave portion is used as a mold frame. A recess filling step of filling the gap between the first bag bodies with the second fluid filler inside and a roadbed for placing a roadbed material on the first bag body to form a roadbed under the road And a forming step. According to this method, the above-described road reinforcement structure can be efficiently constructed.

  Further, in the bag body installation step, a sheet may be laid on the inner side surface of the recess, and in the recess filling step, the second fluid filler may be filled into the inner space partitioned by the sheet. According to this configuration, it is possible to prevent the fluid filler from penetrating from the inner side surface of the recess to the ground below.

  In the first bag body filling step, each first bag body is filled with the first fluid filler so that adjacent first bag bodies are in contact with each other, and the first bag bodies are in contact with each other. A tubular member communicating between the space above the portion and the space below the contact portion is sandwiched between the adjacent first bag bodies, and in the recess filling step, the tubular member is passed through the tubular member than the contact portion. The second fluid filler may be injected into the lower space. When the first bags filled with the fluid filler are in contact with each other, the fluid filler is less likely to reach the space below the contact portion. Therefore, by installing the tubular member, the fluid filler can be efficiently injected into the space below the contact portion through the tubular member.

  Specifically, the second fluid filler may be made of a curable material.

  According to the road reinforcement structure and the reinforcement method of the present invention, in reinforcement of a road in which reinforcement bodies are arranged, prevention of dropping of granular materials, prevention of biting of the reinforcement bodies into the ground, and further integration of the reinforcement bodies are achieved. be able to.

It is sectional drawing which shows the reinforcement structure of the road which concerns on 1st Embodiment of this invention. FIG. 2 is a perspective view showing a positional relationship between a reinforcing layer and a box culvert in the reinforcing structure of FIG. 1. It is a perspective view which shows the bag body unit used for construction | assembly of the reinforcement structure of FIG. It is sectional drawing which shows the reinforcement structure of the road which concerns on 2nd Embodiment of this invention. It is a top view of the reinforcement layer of the reinforcement structure of FIG. It is sectional drawing which shows the binding state of the reinforcement bodies in the reinforcement structure of FIG. It is sectional drawing of the reinforcement layer constructed | assembled by the reinforcement method of 3rd Embodiment. (A) is a top view of the reinforcement part in the middle process of the reinforcement method of 3rd Embodiment, (b) is the sectional drawing. It is sectional drawing which shows the modification of the reinforcement layer of FIG. It is a top view of the reinforcement part which shows the modification of the reinforcement method shown in FIG. It is XI-XI sectional drawing of the reinforcement part shown in FIG. It is sectional drawing which shows the other reinforcement structure to which this invention is applied.

  Hereinafter, embodiments of a road reinforcing structure and a reinforcing method according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a road reinforcement structure 1 that reinforces a road 100 according to a first embodiment of the present invention. The direction orthogonal to the paper surface of FIG. 1 is the traveling direction of the road 100. The road 100 passes over the box culvert 103 buried underground. An embankment layer 3 by backfilling is provided on the box culvert 103, and a reinforcement layer 5 for reinforcing the road 100 is provided on the embankment layer 3. Further, a roadbed 7 is provided on the reinforcing layer 5, and an asphalt pavement 9 is provided on the roadbed 7.

  As shown in FIG. 2, the road 100 extends across the box culvert 103. In FIG. 2, the embankment layer 3, the roadbed 7, and the asphalt pavement 9 are not illustrated in order to facilitate understanding of the positional relationship between the road 100 and the box culvert 103. In the underground structure under the road 100, the underground structure portion without the box culvert 103 and the underground structure portion with the box culvert 103 are discontinuously changed in the traveling direction of the road 100. As in this example, a boundary line between discontinuous underground structures is called a “discontinuous structure boundary line”. In the present embodiment, the edge portion 103a of the box culvert 103 corresponds to a discontinuous structure boundary line.

  The subsidence of the underground structure portion without the box culvert 103 and the underground structure portion with the box culvert 103 are different in the ground subsidence state at the time of the earthquake. Steps and irregularities are likely to occur along the edge portion 103a. In this way, when the road 100 exists across the discontinuous structure boundary line, it is necessary to suppress the steps and unevenness of the road 100 that occur along the discontinuous structure boundary line during an earthquake. Therefore, the reinforcing layer 5 described above has a function of suppressing the generation of a road 100 step and unevenness particularly in the edge portion 103a. Here, it is assumed that the road 100 extends in a direction orthogonal to the edge portion 103a.

  Hereinafter, a specific structure of the reinforcing layer 5 will be described. As shown also in FIG. 2, the reinforcing layer 5 is embedded in the basement of the road 100 so as to extend in the traveling direction of the road 100. The reinforcing layer 5 has a plurality (five in the present embodiment) of reinforcing bodies 21 extending substantially parallel to each other in the traveling direction of the road 100. The reinforcing bodies 21 have, for example, a cylindrical shape with a diameter of about 20 cm, and are arranged in the transverse direction of the road 100 at intervals of about 0 to 20 cm. The reinforcing body 21 has an elongated bag body (first bag body) 21a elongated in the traveling direction and a compression resistor (first compression resistor) 21b formed inside the elongated bag body 21a. doing. The elongate bag body 21a is made of a material that allows air to pass through without passing through a first fluid filler described later, and is made of, for example, a polyester woven fabric. The compression resistor 21b is formed by injecting and filling a first fluid filler into the elongated bag 21a.

  The reinforcing layer 5 includes a large bag body (second bag body) 22a that surrounds all of the plurality of reinforcing bodies 21 together. And the clearance gap between each reinforcement body 21 inside the large bag body 22a is filled up with the compression resistor (2nd compression resistor) 22b. The compression resistor 22b is formed by injecting and filling the second fluid filler into the gaps between the reinforcing bodies 21 inside the large bag body 22a. For the large bag body 22a, a material that allows air to permeate without allowing the second fluid filler to permeate is selected. The large bag body 22a and the compression resistor body 22b constitute a reinforcing body fixing portion 22 that fixes the positional relationship between the reinforcing bodies 21 in the arrangement direction (transverse direction of the road 100).

  The “compressive resistor” means an object made of a material that resists compressive stress. For example, examples of the compression resistor include hardened mortars. As the first fluid filler that forms the compression resistor 21b and the second fluid filler that forms the compression resistor 22b, a fluid curable material (for example, mortars) may be used. A filler that does not contain a solidifying material (for example, a mixture of sand and water) may be employed. Further, the first fluid filler and the second fluid filler may be the same or different from each other.

  Below, the case where curable materials, such as mortars, are used as an example is demonstrated as a 1st and 2nd fluid filler. That is, the compression resistor 21b is formed by injecting, filling, and curing a fluid curable material inside the elongated bag 21a. The compression resistor 22b is formed by injecting, filling, and curing a fluid curable material into the gaps between the reinforcing bodies 21 inside the large bag body 22a.

  Then, the reinforcement method of the road 100 which builds the above reinforcement layers 5 is demonstrated.

(Bag unit preparation process)
First, as shown in FIG. 3, a bag body unit 23 is prepared in which a plurality of elongate bag bodies 21a are housed inside a large bag body 22a. The said bag body unit 23 is laid on the embankment layer 3 (FIG. 1) along the extending direction of the road 100 (bag body setting process). At this time, as for both the large bag body 22a and the elongate bag body 21a, the one end part side of the longitudinal direction is opened, and the other end part side is obstruct | occluded. In FIG. 3, the elongate bag body 21 a is depicted as a cylindrical shape in order to facilitate understanding of the structure, but actually, the bag body unit 23 before the curable material is injected is crushed by its own weight. The entire cage has a flat sheet shape. Each elongate bag body 21a may be joined to the inner surface of the large bag body 22a by a method such as stitching, tying with a string, or adhesion in order to prevent displacement. In this case, it is preferable to form the joint portions of the elongated bag body 21a and the large bag body 22a as a plurality of points with an appropriate interval, rather than forming the joint portion so as to extend in the traveling direction of the road 100.

(Long bag filling process)
Subsequently, a fluid curable material (first fluid filler) is pressurized and injected into the inside of each elongated bag body 21a from the opening side of each elongated bag body 21a (first bag body filling step). At this time, since it is not necessary for the end portions of the respective elongated bag bodies 21a to be opened, they are closed in advance, leaving only an injection port having a size capable of injecting a curable material. By injecting the curable material, each elongated bag body 21a swells in a cylindrical shape. Further, since air remaining inside the elongated bag body 21a passes through the elongated bag body 21a and is discharged to the outside, the entire elongated bag body 21a is filled with a curable material. After the injection is completed, the injection port at the end of the elongated bag body 21a is closed by adhesion, stitching, welding, pressure bonding, or other methods. Then, the curable material poured into each elongated bag body 21a is cured by allowing to stand for a predetermined time (first curing step). The compression resistor 21b is formed when the curable material in each elongate bag 21a hardens | cures.

(Large bag filling process)
Subsequently, a fluid curable material (second fluid filler) is injected under pressure from the opening side of the large bag body 22a into the large bag body 22a (gap filling process, second bag body filling process). At this time, since it is not necessary for the end portion of the large bag body 22a to be completely open, the large bag body 22a is closed in advance, leaving only an injection port of a size that allows injection of the curable material. The injected curable material is filled in a gap between the elongated bag bodies 21a inside the large bag body 22a. Moreover, since the air remaining inside the large bag body 22a passes through the large bag body 22a and is discharged to the outside, the entire large bag body 22a is filled with a curable material. The large bag 22a may not be made of a gas-permeable material, and an exhaust port may be provided at a position farthest from the injection port. As described above, if the joint portion between the elongated bag body 21a and the large bag body 22a is formed as a plurality of points spaced at appropriate intervals, the movement of the curable material is hardly hindered at the joint portion, and the curability is reduced. The material is easy to spread throughout. After the injection is completed, the injection port at the end of the large bag 22a is closed by adhesion, stitching, welding, crimping, or other methods.

  It should be noted that the fact that the curable material has been injected into the entire large bag body 22a (there is no air remaining inside) means that a sudden rise in pressure inside the large bag body 22a is detected or the large bag body 22a is made of a gas-permeable material. If not, it can be confirmed by detecting the outflow of the curable material from the exhaust port. If the injection pressure is increased too much at the completion of the injection, the upper surface of the large bag body 22a may swell in an arc shape, so that the pressure is reduced as necessary or excessive curable material is discharged.

  Thereafter, the curable material injected into the large bag body 22a is cured by allowing to stand for a predetermined time (second curing step). When the curable material in the large bag body 22a is cured, the compression resistor 22b is formed.

  In addition, you may perform a large bag body filling process after the elongate bag body filling process, before the curable material inject | poured into each elongate bag body 21a hardens | cures. In this case, in order to prevent deformation of the filled elongated bag body 21a, the injection into the large bag body 22a is performed while maintaining the pressure in the elongated bag body 21a, and the injection pressure to the large bag body 22a is set. The pressure in the elongated bag body 21a needs to be equal to or lower than the pressure.

  Then, a roadbed material is laminated | stacked on the large bag body 22a, and the roadbed 7 (FIG. 1) is formed (roadbed formation process). And the asphalt pavement 9 is formed on the roadbed 7, and the reinforcement structure of the road 100 is completed. As the roadbed material forming the roadbed 7, for example, a granular material such as crushed stone, gravel, slag, recycled aggregate, sand, or a mixture of these materials with a stabilizing material such as cement, lime, asphalt, or the like is employed.

  According to the structure and the reinforcing method of the reinforcing layer 5 as described above, in the formation of the compression resistor 22b, a fluid curable material is injected into the large bag body 22a, thereby forming a gap between the reinforcing bodies 21. In addition, the curable material is sufficiently spread, and the gap between the reinforcing bodies 21 is appropriately filled with the compression resistor 22b. In particular, when the reinforcing bodies 21 having a cylindrical shape are arranged at a narrow interval, it is difficult to fill the lower half of the gap between the reinforcing bodies 21 with the filler from above. On the other hand, according to the structure of the reinforcing layer, a fluid curable material is pressure-injected into the large bag body 22a so that the curable material is appropriately placed in the gap between the reinforcing bodies 21 with good workability. Can be spread.

  By appropriately filling the gap between the reinforcing bodies 21 with the curable material, after the reinforcement layer 5 is completed, the reinforcing bodies 21 move in the horizontal direction, or the reinforcing bodies bite into the ground below and the road surface sinks. And the possibility that the ground above the reinforcing layer 5 such as the roadbed 7 sinks and the road surface collapses is reduced.

  Further, in the reinforcing layer 5, since the bending rigidity due to the compressive strength of the compression resistor 22b and the tensile strength of the large bag body 22a is added in addition to the bending rigidity of the reinforcing body 21 itself, the reinforcing effect of the road 100 is obtained. improves.

  Further, since the formation of the reinforcing body fixing portion 22 is mainly intended to eliminate the gap between the reinforcing bodies 21, the curable material forming the compression resistor 22b is lower than the curable material forming the compression resistor 21b. It may be quality (compression strength and compression rigidity are small). However, a high-quality material may be used as the curable material forming the compression resistor 22b. In this case, the above-described effect of improving the bending rigidity of the reinforcing layer 5 can be further enhanced. Moreover, since the curable material for filling up the clearance gap between reinforcement bodies 21 is inject | poured inside the large bag body 22a, it can avoid that a curable material osmose | permeates the embankment layer 3. FIG.

  Moreover, since the reinforcement body 21 is a structure surrounded by the reinforcement body fixing | fixed part 22, the reinforcement body 21 does not contact the embankment layer 3 grade | etc., Directly. As a result, there is little abrasion and damage of the reinforcement body 21, and durability of the reinforcement body 21 improves.

  It is possible to omit the reinforcing body 21 and to inject the curable material into the large bag body 22a and harden it to form the reinforcing layer. However, in this case, a means for adjusting the height of the reinforcing layer is required, which is complicated. It is. Further, when the reinforcing layer is bent, the large bag body 22a and the compression resistor are peeled off on the compression side, and the large bag body 22a may be loosened. For this reason, when the compression resistor is compressed and broken, the compression resistor is not restrained, and the crushed compression resistor is deformed. Further, the yield strength on the compression side is lost and the bending displacement increases, and as a result, the function of reinforcing the road 100 by the reinforcing layer is not exhibited. Therefore, in the configuration in which the reinforcing body 21 is omitted, it is considered that the reinforcing function of the road 100 is not sufficiently exhibited. On the other hand, in the reinforcing body 21 having a circular cross section, the elongate bag body 21a and the compression resistor 21b are not easily separated even on the compression side when bending occurs, and the loss of the proof stress on the compression side as described above occurs. Since it is difficult, the reinforcement function of the road 100 by a reinforcement layer is fully exhibited.

  As a result, according to the reinforcing structure 1 and the reinforcing method of the road 100, in the reinforcement of the method in which the reinforcing bodies 21 are arranged, the granular material constituting the roadbed 7 is prevented from dropping, and the reinforcing body 21 is prevented from biting into the ground. Integration of the reinforcing bodies 21 can be achieved.

(Second Embodiment)
A reinforcement structure 51 and a reinforcement method for a road 150 according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In the reinforcing structure 51 of the present embodiment, the same or equivalent components as those of the above-described reinforcing structure 1 are denoted by the same reference numerals, and redundant description is omitted. FIG. 4 is a cross-sectional view of the road reinforcing structure 51 that reinforces the road 150, and the direction orthogonal to the paper surface of FIG. 4 is the traveling direction of the road 150. FIG. 5 is a plan view of the reinforcing layer 55 included in the reinforcing structure 51, and FIG. 6 is a cross-sectional view illustrating only two adjacent reinforcing bodies 21 included in the reinforcing layer 55.

  As shown in FIG. 4, the reinforcing structure 51 of this embodiment includes a reinforcing layer 55 instead of the reinforcing layer 5 of the first embodiment. The reinforcing layer 55 includes a plurality (five in the present embodiment) of reinforcing bodies 21 including elongated bags 21a and compression resistors 21b. Furthermore, the reinforcing layer 55 includes a fixing portion 32 having a mountain-shaped cross section that is inserted in a lower portion between the reinforcing bodies 21 and extends substantially parallel to the reinforcing bodies 21. The fixing portion 32 includes a small bag body (second bag body) 32a thinner than the elongated bag body 21a, and a small compression resistor formed by filling and curing a curable material (for example, mortar) inside the small bag body 32a. (Second compression resistor) 32b. For the sachet 32a, a material that allows air to permeate without allowing the fluid curable material to permeate is selected, and it is made of, for example, a polyester woven fabric.

  Further, in the reinforcing structure 51, as shown in FIGS. 5 and 6, a binding band (binding body) 33 for binding two or more adjacent reinforcing bodies 21 and the fixing portion 32 is attached to each reinforcing body 21. It has been. Due to the tensile strength of the binding band 33, the adjacent reinforcing bodies 21 are prevented from moving away from each other. The fixing part 32 and the binding band 33 constitute a reinforcing body fixing part that fixes the positional relationship between the reinforcing bodies 21 in the arrangement direction (the crossing direction of the road 150).

  Then, the reinforcement method of the road 150 which builds the above reinforcement layers 55 is demonstrated.

(Bag unit preparation process)
First, the embankment layer in a state in which a plurality of elongate bag bodies 21 a extending in the traveling direction of the road 150 and the small bag bodies 32 a arranged between the elongate bag bodies 21 a are arranged substantially in parallel and bound by a tie band 33. Install on 3 (bag body installation process). At this time, the small bag body 32a is disposed directly below the gap along the gap between the adjacent elongated bag bodies 21a, and is disposed so as to overlap below the two adjacent elongated bag bodies 21a. At this time, the elongated bag body 21a and the small bag body 32a are both in a state in which one end side in the longitudinal direction is opened and the other end side is closed. Since the elongate bag body 21a and the small bag body 32a are before the curable material is injected, the elongate bag body 21a and the small bag body 32a are actually crushed by their own weight and form a flat sheet shape as a whole. Each elongated bag body 21a and each small bag body 32a may be joined to the binding band 33 by a method such as stitching, tying with a string, or adhesion in order to prevent displacement.

(Long bag filling process)
Subsequently, a fluid curable material is injected under pressure from the opening side of each elongated bag body 21a into each elongated bag body 21a (first bag filling step). At this time, since it is not necessary for the end portions of the respective elongated bag bodies 21a to be opened, they are closed in advance, leaving only an injection port having a size capable of injecting a curable material. By injecting the curable material, each elongated bag body 21a swells in a cylindrical shape. Further, since air remaining inside the elongated bag body 21a passes through the elongated bag body 21a and is discharged to the outside, the entire elongated bag body 21a is filled with a curable material. After the injection is completed, the injection port at the end of the elongated bag body 21a is closed by adhesion, stitching, welding, pressure bonding, or other methods. Then, the curable material poured into each elongated bag body 21a is cured by allowing to stand for a predetermined time (first curing step). The curable material in each elongate bag body 21a is cured, whereby the compression resistor 21b is formed and the reinforcing body 21 is formed.

(Packet filling process)
Subsequently, a fluid curable material is pressurized and injected into the inside of the pouch body 32a from the opening side of the pouch body 32a (gap filling process, second bag filling process). At this time, since it is not necessary that the end portions of the pouch bodies 32a are all open, the pouch body 32a is closed in advance, leaving only an injection port having a size capable of injecting the curable material. The sachet 32a infused with the curable material swells into a shape along the lower cylindrical surface of the reinforcing body 21. Further, since air remaining inside the pouch body 32a passes through the pouch body 32a and is discharged to the outside, the entire pouch body 32a is filled with a curable material. Further, the presence of the binding band 33 can also prevent the spacing between the reinforcing bodies 21 from being expanded due to the expansion of the small bag body 32a. After the injection is completed, the injection port at the end of each pouch 32a is closed by adhesion, stitching, welding, pressure bonding, or other methods. Thereafter, the curable material injected into the sachet 32a is cured by allowing to stand for a predetermined time (second curing step). When the curable material in the small bag body 32a is cured, the compression resistor 32b is formed, and the fixing portion 32 is formed.

  Note that the fact that the curable material has been injected into the entire pouch body 32a (there is no air remaining inside) can be confirmed by detecting a rapid increase in the pressure inside the pouch body 32a. If the injection pressure into the sachet body 32a is increased too much, the reinforcing body 21 may be deformed or displaced, or the sachet body 32a may be pulled out above the reinforcing body 21 due to pressurization. It is preferable to use the lowest possible injection pressure.

  In addition, you may perform a small bag body filling process after the elongate bag body filling process, before the curable material inject | poured into each elongate bag body 21a hardens | cures. In this case, in order to prevent deformation of the filled elongate bag body 21a, the injection into the pouch body 32a is performed while maintaining the pressure in the elongate bag body 21a, and the injection pressure into the pouch body 32a is set. The pressure in the elongated bag body 21a needs to be equal to or lower than the pressure.

  Then, the roadbed 7 is formed by laminating crushed stones on the respective elongated bag bodies 21a and the respective small bag bodies 32a (roadbed forming step). And the asphalt pavement 9 is formed on the roadbed 7, and the reinforcement structure of the road 150 is completed.

  According to the structure and the reinforcing method of the reinforcing layer 55 as described above, in the formation of the fixing portion 32, a fluid curable material is injected under pressure into the pouch body 32a, so that the lower portion of the gap between the reinforcing bodies 21 is provided. Since the small bag body 32a swells in accordance with the shape, the gap between the reinforcing bodies 21 is appropriately filled with the fixing portion 32. In particular, when the reinforcing bodies 21 having a cylindrical shape are arranged at a narrow interval, it is difficult to fill the lower half of the gap between the reinforcing bodies 21 with the filler from above. On the other hand, according to the structure of the reinforcing layer 55, by pressurizing and injecting a fluid curable material into the inside of the small bag body 32a, it is buried in the lower part of the gap between the reinforcing bodies 21 with good workability. The fixed part 32 having a shape can be formed. The upper part of the gap between the reinforcing bodies 21 can be easily filled with crushed stone in the step of forming the roadbed 7.

  When the lower part of the gap between the reinforcing bodies 21 is appropriately filled with the fixing portion 32, the reinforcing bodies 21 move in the horizontal direction after the reinforcement layer 55 is completed, or the reinforcing bodies bite into the ground below and the road surface. The possibility that the ground will sink or the ground above the reinforcing layer 55 such as the roadbed 7 will sink and the road surface collapses is reduced.

  Further, in the reinforcing layer 55, the bending rigidity due to the compressive strength of the compression resistor 32b and the tensile strength of the small bag body 32a is added in addition to the bending rigidity of the reinforcing body 21 itself. improves.

  As a result of the above, according to the reinforcing structure 51 and the reinforcing method of the road 150, in the reinforcement of the method of arranging the reinforcing bodies 21, the granular material constituting the roadbed 7 is prevented from dropping, and the reinforcing body 21 is prevented from biting into the ground. Integration of the reinforcing bodies 21 can be achieved.

  In addition, since the formation of the fixing portion 32 is mainly intended to eliminate the gap between the reinforcing bodies 21, the curable material forming the compression resistor 32b has a lower quality than the curable material forming the compression resistor 21b ( Compression strength and compression rigidity may be small). However, a higher quality material may be used as the curable material forming the compression resistor 32b. In this case, the above-described effect of improving the bending rigidity of the reinforcing layer 5 can be further enhanced. Moreover, since the curable material for filling up the clearance gap between reinforcement bodies 21 is inject | poured into the inside of the small bag body 32a, it can avoid that a curable material permeates into the embankment layer 3. FIG.

  In addition, since the formation of the fixing portion 32 is mainly intended to fill the lower portion of the gap between the reinforcing bodies 21, the diameter of the small bag body 32a needs to be larger than the diameter necessary for filling the lower portion of the gap. is there. Furthermore, it is good also as a diameter which can fill the upper part of the clearance gap between reinforcement bodies 21 to the upper end height of the reinforcement body 21. FIG.

(Third embodiment)
Then, the reinforcement structure 201 and the reinforcement method of the road 200 which concern on 3rd Embodiment of this invention are demonstrated, referring FIGS. In the reinforcing structure 201 of the present embodiment, the same or equivalent components as those of the reinforcing structure 1 described above are denoted by the same reference numerals and redundant description is omitted. FIG. 7 is a cross-sectional view of the reinforcing layer 205 constructed by the reinforcing method of the present embodiment. The direction orthogonal to the paper surface of FIG. 7 is the traveling direction of the road 200. Fig.8 (a) is a top view in the middle process of the reinforcement method of this embodiment, FIG.8 (b) is the sectional drawing. In addition, the embankment layer 3 exists in the layer under the reinforcement layer 205, and the box culvert 103 exists under the embankment layer 3, but those structures are as 1st Embodiment (refer FIG. 1). 7 to 11, detailed illustration of the embankment layer 3 and the box culvert 103 is omitted.

  As shown in FIG. 7, the reinforcing structure 201 of the present embodiment includes a reinforcing layer 205 instead of the reinforcing layer 5 of the first embodiment. The reinforcing layer 205 includes a plurality (five in this embodiment) of reinforcing bodies 21 and a compression resistor 222b that fixes the reinforcing bodies 21 to each other. The compression resistor 222b is formed by curing a curable material (second fluid filler) filled in a gap between the reinforcing bodies 21. The compression resistor 222b constitutes a reinforcing body fixing portion that fixes the positional relationship between the reinforcing bodies 21 in the arrangement direction (the crossing direction of the road 200).

  Then, the reinforcement method of the road 200 which builds the above reinforcement layers 205 is demonstrated. The reinforcing method of the present embodiment includes a recess forming process, a bag body installing process, a bag body filling process, a recess filling process, and a roadbed forming process, which will be described below.

(Recess formation process)
At the stage where the embankment layer 3 is provided on the box culvert 103 in the ground 230 below the planned reinforcement of the road 200, as shown in FIGS. 8 (a) and 8 (b), above the embankment layer 3. A concave portion 231 having a rectangular shape in plan view is formed. The recess 231 may be formed in the embankment layer 3.

(Bag body installation process)
Subsequently, as shown in FIGS. 8A and 8B, a plurality (five in this embodiment) of elongated bags 21 a are installed inside the recess 231. In this case, the elongated bag bodies 21a extend in the traveling direction of the road 200 and are arranged substantially parallel to each other.

(Bag filling process)
Next, a curable material (first fluid filler) is filled into the elongated bag body 21a. The filling method is the same as in the first embodiment. Thereafter, the curable material injected into each elongated bag body 21a is cured by allowing to stand for a predetermined time. When the curable material in each elongated bag 21a is cured, the compression resistor 21b is formed, and the reinforcing body 21 is formed.

(Recess filling process)
Next, a curable material (second fluid filler) is filled in the gap between the elongated bag bodies 21a inside the recess 231 using the recess 231 as a mold. Then, the curable material with which the recessed part 231 was filled is hardened by leaving still for predetermined time. When the curable material is cured, a compression resistor 222b is formed as shown in FIG.

(Roadbed formation process)
Thereafter, the roadbed 7 is formed by laminating crushed stones on the respective elongated bag bodies 21a and the respective small bag bodies 32a. And the asphalt pavement 9 is formed on the roadbed 7, and the reinforcement structure of the road 200 is completed.

  According to this reinforcing structure, the compression resistor 222b exists between the reinforcing bodies 21. Since the compression resistor 222b is formed by filling a fluid curable material between the reinforcing bodies 21, the curable material is sufficiently formed in accordance with the shape of the gap between the reinforcing bodies 21. Go around. Therefore, according to this reinforcement structure, the clearance gap between the reinforcement bodies 21 can be filled appropriately. As a result, it is possible to prevent the granular material constituting the roadbed 7 from falling down, prevent the reinforcing body 21 from biting into the ground, and further integrate the reinforcing bodies 21 together.

  As shown in FIG. 9, in the bag installation process, a sheet 233 (for example, a water-impervious sheet) is laid on the inner surface 231 a of the recess 231, and in the recess filling process, an inner space partitioned by the sheet 233. It is good also as filling a curable material. According to this structure, it can suppress that a sclerosing | hardenable material osmose | permeates into the ground below (for example, embankment layer 3) from the inner surface of the recessed part 231. FIG.

  Moreover, as shown in FIG.10 and FIG.11, in a bag body filling process, a curable material may be filled so that the side surfaces (reinforcing bodies 21) of the adjacent elongate bag body 21a may contact. In this case, it is difficult for the curable material to reach the space 233 (FIG. 11) below the contact portion between the reinforcing bodies 21. Therefore, the tubular member 235 that communicates the space above the contact portion of the elongated bag body 21a and the space 233 below the contact portion is sandwiched and installed between the adjacent elongated bag bodies 21a. In the recess filling step, a curable material is injected from above the reinforcing body 21 into the space 233 through the tubular member 235. Thereafter, the tubular member 235 may be removed or may remain. Thus, the curable material can be efficiently injected into the space 233 below the contact portion between the reinforcing bodies 21 through the tubular member 235. According to this reinforcing method, since the small bag body 32a or the large bag body 22a as used in the first or second embodiment can be omitted, the economy is excellent.

  In the case where the side surfaces of the reinforcing body 21 are in contact with each other, a curable material may be injected into the space 233 from the end 237 (FIG. 10) side of the reinforcing body 21. In this case, the curable material flows from the end side of the reinforcing body 21 in the extending direction of the reinforcing body 21, so that the space 233 is filled with the curable material.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to the said embodiment, You may change in the range which does not change the summary described in each claim. For example, in the embodiment, the reinforcing bodies 21 are arranged in one horizontal row, but as shown in FIG. 12, the reinforcing bodies 21 are stacked in multiple layers (two layers in the example of FIG. 12) in the large bag body 22a. The present invention can also be applied to the case where the multilayered reinforcing member 21 is formed in the vertical direction. Further, in the embodiment, since the road extends orthogonally to the discontinuous boundary line (edge portion 103), the example in which the reinforcing bodies are arranged in the traveling direction of the road has been described. It is not limited to such a mode. That is, when the discontinuous boundary line obliquely intersects the road traveling direction, or when the discontinuous boundary line is parallel to the road traveling direction, the extending direction of the reinforcing body is the discontinuous boundary line. It is preferable to install a reinforcing body so as to intersect (preferably so as to be orthogonal).

  In the embodiment, an example of a discontinuous underground structure has been described using an underground structure in which the box culvert 103 is embedded, but the present invention is not limited to this. The present invention can be applied to a case where a road crosses an underground structure that is more rigid than the ground such as reinforced concrete other than the box culvert. In particular, when the underground structure is supported by a solid formation such as a pile or a direct foundation, a step during an earthquake is likely to occur, and the present invention is particularly preferably applied. Further, when the ground improvement is applied to the road body and the roadbed, the ground improvement portion is unlikely to sink, so that a step is likely to occur at the end of the ground improvement portion during an earthquake. By applying the present invention to the end portion of such a ground improvement portion, it is possible to reduce the possibility of a road step.

  Further, the present invention can be applied even when there is no discontinuous underground structure boundary as in the embodiment. For example, during an earthquake, a part of the ground (road body) may collapse, resulting in a road step at the boundary between the collapsed part and the uncollapsed part. At this time, there may be a case where uneven settlement occurs in the collapsed portion. In addition, even if the ground does not collapse, the ground may subsidize due to shaking by an earthquake. Even in such a case, by applying the present invention to the road, it is possible to reduce the possibility that a step is generated on the road.

DESCRIPTION OF SYMBOLS 1,51,201 ... Reinforcement structure, 21 ... Reinforcement body, 21a ... Elongate bag body (1st bag body), 21b ... Compression resistance body (1st compression resistance body), 22 ... Reinforcement body fixing | fixed part, 22a ... Large bag (second bag), 22b ... compression resistor (second compression resistor), 32 ... fixing part (reinforcing body fixing part), 32a ... small bag (second bag), 32b ... compression Resistor (second compression resistor), 33... Binding band (bundling body, reinforcing body fixing portion), 100, 150, 200... Road, 103a. (Second compression resistor, reinforcing body fixing portion) 231... Recessed portion, 233... Sheet, 233.

Claims (12)

A plurality of reinforcement bodies arranged in the basement of the road and extending in a predetermined direction;
A reinforcing body fixing portion for fixing the positional relationship between the reinforcing bodies in the arrangement direction,
The reinforcing body is
A first bag extending in the predetermined direction;
A first compression resistor formed by filling the inside of the first bag body with a first fluid filler,
The reinforcing body fixing part is
A road reinforcement structure comprising a second compression resistor formed by filling a second fluid filler between the reinforcements. The reinforcing body fixing part is
The second bag for housing the plurality of reinforcing bodies;
The second compression resistor formed by filling a gap between the plurality of reinforcing bodies inside the second bag body with the second fluid filler. The road reinforcing structure according to Item 1. The reinforcing body fixing part is
A second bag inserted between the reinforcements and extending substantially parallel to the reinforcements;
The second compression resistor formed by filling the second bag body with the second fluid filler; and
The road reinforcing structure according to claim 1, further comprising: a binding body that binds the reinforcing bodies together in the arrangement direction. The road exists on a discontinuous structure boundary line that is a boundary line between discontinuous underground structures,
The road reinforcement structure according to any one of claims 1 to 3, wherein the reinforcing body extends in a direction crossing the discontinuous structure boundary line.   The second fluid filler is made of a curable material, and the second compression resistor is formed by curing the second fluid filler. The road reinforcement structure according to claim 1. A bag body installation step of installing a plurality of first bag bodies extending in a predetermined direction on the ground below the road;
A first bag filling step of filling the first bag body with a first fluid filler;
After the first bag body filling step, a gap filling step of filling the second fluid filler in the gap between the first bag bodies,
A roadbed forming step of placing a roadbed material on the first bag body to form a roadbed under the road, and a road reinforcing method. A bag body installation step of installing a second bag body containing a plurality of first bag bodies extending in a predetermined direction on the ground below the road;
A first bag filling step of filling the first bag body with a first fluid filler;
After the first bag filling step, a second bag filling step of filling the second fluid filler in the gap between the first bag bodies inside the second bag,
And a roadbed forming step of placing a roadbed material on the second bag body to form a roadbed below the road. The ground below the road in a state in which a plurality of first bags extending in a predetermined direction and a second bag disposed between the first bags are arranged in parallel and bound together A bag installation process to be installed in
A first bag filling step of filling the first bag body with a first fluid filler;
After the first bag body filling step, a second bag body filling step of filling the second bag body with a second fluid filler,
And a roadbed forming step of placing a roadbed material on the first and second bag bodies to form a roadbed under the road. A recess forming step for forming a recess in the ground below the road;
A bag body installation step of installing the plurality of first bag bodies extending in a predetermined direction in the recess in a state of being arranged substantially in parallel;
A first bag filling step of filling the first bag body with a first fluid filler;
After the first bag filling step, the recess filling step of filling the gap between the first bag bodies with the second fluid filler inside the recess using the recess as a mold,
A roadbed forming step of placing a roadbed material on the first bag body to form a roadbed under the road, and a road reinforcing method. In the bag installation step, a sheet is laid on the inner surface of the recess,
The road reinforcing method according to claim 9, wherein, in the recess filling step, the second fluid filler is filled into an inner space partitioned by the sheet. In the first bag filling step,
While filling each said 1st bag body so that adjacent said 1st bag bodies may contact, the space above the contact part of said 1st bag bodies A tubular member that communicates with the space below the contact portion, and sandwiched between the adjacent first bag bodies,
In the recess filling step,
The road reinforcing method according to claim 9 or 10, wherein the second fluid filler is injected into a space below the contact portion through the tubular member. The road reinforcing method according to any one of claims 6 to 11, wherein the second fluid filler is made of a curable material.

Images