JPH10183624A - Reinforcing fill-up wall employing retaining wall block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase effect of reinforcement for a fill-up wall constructed in steepness, and to effectively prevent deformation from occurring to the fill-up wall. SOLUTION: Base blocks are laid on a created ground or a consolidated foundation BC, being arranged in the direction intersecting at a right angle the section of a fill-up wall, and a retaining wall block 11 is placed thereon. Then, a fill-up layer G'1 attaining in a height at an attachment hole of the retaining wall block 11 is formed with fill-up materials G spread and compacted. A beltlike reinforcing member 4, connected with a tensile force-giving metal 5 to the attachment hole of each of the retaining wall blocks 11 , is laid on the fill-up layer G'1 . Then, a second retaining wall block 12 is placed on the retaining wall block 11 , and a second fill-up layer G'2 is formed. With similar works repeated successively, a fill-up foundation in a specified height is created. After consolidation, settlement and deformation are ceased at the fill-up foundation, tensile force is given to the beltlike reinforcing member 4 with a nut 52 of the tensile fiorce-giving metal 5 screwed up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced embankment wall method for reinforcing an embankment wall to create an embankment having a steep wall surface in earthwork involving cutting and embankment work.

[0002]

2. Description of the Related Art In earthworks such as a mountainous area, a road near a city, a river embankment, and the like, the work is carried out while maintaining a balance between cut and embankment in a planned area. That is, from the embankment strength exerted by compacting and consolidating the edge slope of the embankment to the required density, the slope required to satisfy the predetermined safety factor, or depending on the soil material of the embankment material It is constructed to have an empirically determined gradient.

That is, in order to ensure the stability of the embankment, it is necessary to make the embankment wall at the end part a gentle slope to a certain extent. The amount of embankment material will also increase. Therefore, even if the land area is the same, the available area of the embankment top surface is increased as much as possible, or the land is effectively used to save the land area for creating the embankment having the required top surface area, or the embankment material can be saved. In recent years,
There is an increasing number of cases in which the reinforcing embankment wall construction method for steepening the embankment wall is applied by increasing the strength of the embankment wall against slip failure by using a reinforcing material and improving the stability thereof.

Conventionally, as a method for forming a steep reinforced embankment wall, as shown in FIG. 16, for example, as shown in FIG. 16, reinforced concrete or reinforced concrete connected to a band-shaped reinforcing material b such as a zinc iron plate buried in an embankment G is used. The tail armer method of forming a reinforcing embankment wall by stacking a panel wall a made of a metal plate along the embankment wall or a sandbag stacked along the embankment wall by a grid net-like reinforcing material made of a polymer material or a chemical A construction method (not shown) in which a reinforcing embankment wall is formed by winding with a cloth-like reinforcing material made of fiber is employed.

[0005]

However, a dedicated panel wall, such as that employed in the tail arming method, fills the embankment material during construction and fills the embankment wall in accordance with an increase in the height of the embankment. The band-shaped reinforcing material b is displaced with the consolidation deformation of the embankment G during the development process,
Along with this, the panel wall a may be displaced or inclined, and the load received after construction (load of a structure constructed on the embankment, seismic force, etc. When the embankment is a road) Is the load caused by traffic or vibration.) Even if the entire embankment is deformed due to traffic, it tends to give a visual impression without stability. In addition, in the reinforced embankment wall construction method of stacking sandbags, when the sandbags are stacked, the soil inside the sandbags must be sufficiently compacted so that it is not easily deformed, or local deformation of the embankment wall will occur as the embankment rises. And
There is a problem that large deformation occurs even after the completion of the formation.
In addition, in these conventional methods, since the frictional force generated by the relative displacement between the wall reinforcing material such as a panel wall body or a sandbag and the embankment material erected on the inside thereof is based on a reinforcing principle, the embankment embankment to which the embankment is laid is somewhat limited. It is pointed out that the effective reinforcing effect of the wall reinforcing material cannot be exerted unless it is deformed to the maximum.

SUMMARY OF THE INVENTION The present invention has been made under the above circumstances, and the technical problem thereof is to increase the effect of reinforcing a steep embankment wall so that the deformation of the embankment wall can be effectively prevented. It is to prevent.

[0007]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the reinforcing embankment wall construction method using the retaining wall block according to the present invention,
In the construction of an embankment consisting of a plurality of embankment layers, a required number of retaining wall blocks are assembled on a portion serving as an embankment wall when embankment of an embankment layer having a predetermined thickness, and the upper surface of the embankment layer is substantially orthogonal to the embankment wall. A plurality of belt-like reinforcing members are laid in the direction in which the bolts pass through the mounting holes of the retaining wall block, and a nut that is screwed to the outer end of each of the retaining wall blocks is provided through a tensioning metal fitting. The band-shaped reinforcing material is connected to the embankment, and the band-shaped reinforcing material is buried in the embankment by embankment of the upper embankment layer of the embankment layer, and the band-shaped reinforcement in the embankment is tightened by tightening a nut in the tensile force applying bracket. The material is given a tensile force, and the reaction force is used to forcibly displace the embankment and the retaining wall block to increase the embankment strength.

The tensile force applied to the belt-like reinforcing material is typically applied after the formation of the embankment is completed and the consolidation of the embankment converges. However, the deformation of the embankment during the embankment increases. When the retaining wall block is displaced or tilted, a tensile force is applied to the band-shaped metal fitting by a tensile force-imparting metal fitting to correct the arrangement of the retaining wall blocks.

As the belt-like reinforcing material, a large frictional force can be obtained by contacting the embankment material over a wide range, such as a band-like cloth or a net made of a polymer material, or a metal plate, and the ground strength is large. Those that are less likely to corrode in the interior are preferred. Further, preferably, the connecting rod is engaged over the respective tensile force applying brackets of the plurality of retaining wall blocks adjacent to each other, and the plurality of band-shaped reinforcing members are connected to the tensile force applying bracket via the connecting rods. Is done. In this way, the laying intervals of the belt-shaped reinforcing members can be set arbitrarily regardless of the arrangement intervals of the respective pulling force applying brackets connected to the retaining wall block.

[0010]

1 to 3 show embankments formed by a reinforced embankment wall method using a retaining wall block according to the present invention. FIG. 1 is a front view, and FIG. 2 is FIG. II-
FIG. 3 is a schematic vertical sectional view taken along line II ′, and FIG. 3 is a schematic horizontal sectional view taken along line III-III ′ of FIG. In these figures, the reference symbol B is the foundation,
G indicates the embankment formed on the formation base B.

The embankment G has a height H by embedding embankment layers G ′ _{1 to} G ′ _n having a layer thickness ΔH formed by processes such as dispensing and compacting the embankment material G ″ in order from the bottom. The embankment wall, which has been formed and has a steep slope close to vertical, has a large number of retaining wall blocks 1, a base block 2 at its lower end and an upper end, and a cap block 3 on its foundation compaction BC. In a layered stack (stacked form in which the vertical joint is located at the middle in the horizontal direction of the block above or below), a retaining wall W is constructed.
Between the embankment layers G ′ _{1 to} G ′ _{n having the} layer thickness ΔH, the band-shaped reinforcing members 4 extending in a direction perpendicular to the intersection line between the retaining wall W and the horizontal plane are spaced at intervals of the horizontal direction ΔL. Each of the belt-shaped reinforcing members 4 is buried,
Are connected to mounting holes 15 of each retaining wall block 1 described later.

As shown in a perspective view of FIG. 4, the retaining wall block 1 is made of reinforced concrete, and has a horizontally long rectangular shape in front view. On the upper surface, a ridge 11 extending in the center in the thickness direction is formed. On the lower surface, a ridge 12 corresponding to the ridge 11 is formed. The ridge 11 on the upper surface and the retaining wall stacked thereon are formed. The concave stripes 12 on the lower surface of the block 1 are fitted to each other (see FIGS. 6, 7 and the like). A pair of left and right front recesses 13 is formed in the front portion of the retaining wall block 1, and a steel reinforcing plate 14 is fixed to the front of the thin portion formed by the front recess 13, and the center of the front recesses 13, 13 is formed. At the mounting holes 15
Has been established.

The retaining wall block 1 has the front recess 13,
13 and a drain hole 16 is opened between them.
Some of the drain holes 16 do not exist. In order to form a layered stack as shown in FIG. Is a half of the lateral width of the retaining wall block 1 shown in FIG. 4 and has only one front recess 13 and one mounting hole 15 prepared.

As shown in FIG. 3, assuming that the distance between the centers of the left and right mounting holes 15 in the retaining wall block 1 is Lw, the distance from the center of the left mounting hole 15 to the left end of the retaining wall block 1 is as follows. The distance from the center of the right mounting hole 15 to the right end of the retaining wall block 1 is both Lw / 2.
That is, the lateral width of the retaining wall block 1 is equivalent to 2 Lw, and when the retaining wall blocks 1 are connected in the horizontal direction, the mounting holes 15 of the adjacent retaining wall blocks 1 are arranged at intervals Lw. In addition, by connecting the band-shaped reinforcing member 4 to each of the mounting holes 15 via the tensile force-imparting metal fitting 5, the band-shaped reinforcing member 4 is connected.
In the horizontal direction corresponds to the distance Lw between the mounting holes 15.

Base block 2 and cap block 3
Is made of reinforced concrete as shown in FIG. 5, and has a width similar to that of the retaining wall block 1 but a height smaller than that of the retaining wall block 1. On the upper surface of the base block 2, a ridge 21 to be fitted with the concave ridge 12 on the lower surface of the retaining wall block 1 is formed.
On the lower surface, a concave ridge 31 is formed to be fitted with the convex ridge 11 on the upper surface of the retaining wall block 1.

As shown in FIG. 6, the band-shaped reinforcing member 4 is made of a cloth-like sheet or net 4 'made of a polymer fiber material having a required tensile strength, or a band-shaped steel plate 4 as shown in FIG. The steel plate 4 "is used.
In the case of the band-shaped reinforcing member 4 made of, for example, it is also preferable to form a punching metal having a number of small holes for increasing the frictional force due to the engagement with the embankment material G ″, or to apply anticorrosive coating to the surface. Width La and length Lb of reinforcement 4
(See FIG. 3) is set so that when a tensile force is applied by the tensile force applying bracket 5, a large frictional force that does not allow the strip-shaped reinforcing member 4 to be pulled out is exerted between the embankment material G ″. .

When the belt-shaped reinforcing member 4 is made of a sheet or a net 4 ′, a tensioning metal fitting 5 for connecting the reinforcing member 4 to the retaining wall block 1 is, for example, attached to the retaining wall block 1 as shown in FIG. An eyebolt 51 into which a shaft portion 51a is inserted into the hole 15, a nut 52 screwed to an outer end of the shaft portion 51a of the eyebolt 51 protruding from the mounting hole 15 to the front side, and the nut 52 and a retaining wall. A washer 53 is interposed between the front recess 13 of the block 1 and the reinforcing plate 14. Belt-like reinforcing material 4 made of sheet or net 4 '
The connecting ring 41 is attached to the folded portion 4a at one end thereof, and the connecting ring 41 is connected to the tension applying metal fitting 5 by passing through the loop portion 51b at the inner end of the eyebolt 51.

When the belt-shaped reinforcing member 4 is made of a steel plate 4 ", a tensioning metal fitting 5 for connecting the reinforcing member 4 to the retaining wall block 1 is attached to the retaining wall block 1 as shown in FIG. Bolt 5 into which shaft portion 51a is inserted into hole 15
4, a nut 52 screwed to the outer end 54a of the bolt 54 projecting from the mounting hole 15 to the front side, and the nut 52 and the reinforcing plate 14 of the front recess 13 of the retaining wall block 1.
, A U-shaped fitting 56 fixed to the inner end 54b of the bolt 54 by a nut 55 or integrally provided by welding or the like, and the facing of the U-shaped fitting 56 And a connecting shaft 57 driven between the ends 56a and 56b. Strip reinforcement 4 made of steel plate 4 "
Has a connecting hole 42 at one end thereof, and pulls the connecting shaft 57 through the connecting hole 42 at the end of the band-shaped reinforcing member 4 located between the opposed ends of the U-shaped bracket 56 to pull the connecting shaft 57. It is connected to the force giving metal fitting 5.

Since the belt-shaped reinforcing member 4 composed of the sheet or the net 4 'shown in FIG. 6 can be freely deformed, it can easily follow the relative displacement between the embankment G and the retaining wall block 1 due to the consolidation settlement. On the other hand, in the case of the band-shaped reinforcing member 4 made of the steel plate 4 ″ shown in FIG.
By forming a slide joint between the base members 6a and 56b so as to be vertically displaceable along the connection shaft 57,
A follow-up operation to the displacement is enabled.

The tensioning member 5 is rotated by rotating the nut 52 in the tightening direction, so that the eyebolt 51 is rotated.
Alternatively, the bolt 54 receives a thrust in the direction in which it protrudes toward the front side, and applies a pulling force to the belt-like reinforcing member 4 to forcibly generate a relative displacement between the embankment material G ″ and the reaction force thereof, thereby retaining the retaining wall. The block 1 is pressed against the wall of the embankment G. Therefore, the retaining wall block 1 (retaining wall W) is firmly fixed to the embankment wall, and the loose displacement of the embankment wall is prevented, and the strength is reduced. Be improved.

In each of the connection forms shown in FIG. 3, FIG. 6 or FIG. 7, the belt-shaped reinforcing member 4 is connected to each of the mounting holes 15 of the retaining wall block 1 via the tensile force fitting 5. As shown in FIG. 8, a plurality of tensile force-imparting metal fittings 5 are passed through a connecting rod 43, such as a reinforcing bar or a steel rod, having a length that straddles the loop part 51 b (or U-shaped metal fitting 56) of the eyebolt 51. The connection may be performed by passing the connecting rod 43 through the end of the belt-shaped reinforcing member 4.
In this case, by alternately passing the loop portion 51b (or the U-shaped bracket 56) of the eyebolt 51 and the folded end portion of the band-shaped reinforcing member 4, the arrangement interval ΔL of the band-shaped reinforcing member 4 can be reduced by the mounting hole of the retaining wall block 1. Although the distance substantially corresponds to the interval Lw of 15 (the arrangement interval of the tensile force applying metal members 5), a plurality of belt-shaped reinforcing members 4 may be passed between the support positions of the adjacent tensile force applying metal members 5. For this reason, the arrangement interval ΔL of the belt-shaped reinforcing members 4 can be freely set regardless of the interval Lw between the mounting holes 15.

Hereinafter, referring to FIGS. 9 to 13, the process of forming the embankment G shown in FIGS. 1 to 3 by the reinforcing embankment wall method using the retaining wall block according to the present invention will be described in order. explain.

First, as shown in FIG. 9, an embankment land to be laid is prepared to form a substantially horizontal laid foundation B, on which the water flowing from the surrounding ground can be quickly drained. If necessary, a lower drainage layer D having an appropriate thickness is formed by laying a material having good drainage properties such as gravel or crushed stone. In addition, in the case where the portion of the formation base B which is a supporting position for the retaining wall W shown in FIGS. 1 to 3 is insufficient in rigidity, the formation base B is subjected to the load of the retaining wall W at this portion. In order not to cause excessive settlement, foundation stones BC are laid, as necessary, by laying chestnut stone or further throwing concrete BC over the chestnut stone.

Next, as shown in FIG. 10, a plurality of base blocks 2 are laid in a row at a predetermined position on the formation base B or on the hardened foundation compaction BC in a direction orthogonal to the cross section of the drawing. a plurality of retaining wall blocks 1 ₁ of the first stage on the pile in a row. At this time, the upper surface of the ridge 21 of the base block 2, the lower surface of the concave 12 of the retaining wall block 1 ₁ is fitted to each other, each retaining wall block 1 _1, 1 ₁
The vertical joint between the base blocks 2 and 2 is set at an intermediate position between the vertical joints. Further, as retaining wall blocks 1 ₁ the stacked no or fall tilting, previously installed in advance temporary member 6 when piled performs temporary support thereby.

Next, as shown in FIG.
Creation base B or lower drainage layer D in the area on the back side of ₁
The embankment material G "is sprinkled with a spout thickness of, for example, about 30 cm, spread out with a bulldozer or the like, and then rolled with a vibrating roller or the like. by repeating the compaction work required number, as shown in FIG. 12, approximately the first stage of the embankment layer G of thickness reaches the height of the first-stage retaining wall block 1 ₁ the mounting holes 15 _'1 To form

[0026] Next, as shown in FIG. 13, respectively attached to a tensile force applying fitting 5 into the mounting holes 15 of each retaining wall block 1 _1, limbal 51b or U-shaped eye bolts 51 of the tensile force applying fitting 5 at one end A belt-like reinforcing material 4 connected to a metal fitting 56 is provided on the upper surface of the embankment layer G ′ _{1 by} the retaining wall block 1.
Lay in the direction perpendicular to ₁ . Connecting method of retaining wall blocks 1 ₁ tensile force application fitting 5 and the strip reinforcement 4 for is as previously described in FIGS. 3 and 6-8.
When a sheet or a net 4 ′ is used as the belt-shaped reinforcing member 4, it is necessary to lay it in a state where it is appropriately pulled so as not to be loosened as much as possible.

[0027] After laying the strip-like reinforcing material 4, as shown in FIG. 14, on a plurality of retaining wall blocks 1 ₁ of the first stage, pile retaining walls blocks 1 ₂ of the second stage in a row . In this case, ridges 1 of the upper surface of the retaining wall block 1 ₁ of the first stage
1 with the lower surface of the concave 12 of the second stage of the retaining wall block 1 ₂ is fitted to each other, the second-stage retaining wall block 1 _2, 1 vertical joints between ₂ first-stage retaining wall blocks 1 _1, an intermediate position of the longitudinal joint spacing between 1 _1, i.e. made to be a position substantially corresponding to the vertical joints between the base block 2, 2 thereunder. In addition, the temporary member 6 is previously set to the second-stage retaining wall block 1.
It is extended to the height where temporary support of ₂ is possible.

Next, as shown in FIG. 15, the operation of distributing and compacting the embankment material G ″ on the first-stage embankment layer G ′ ₁ is repeated a required number of times, thereby substantially retaining the second-stage embankment. 'to form a _2. in other words the second stage of the embankment layer G' embankment layer G of the second stage layer thickness reaches the height of the mounting hole 15 of the wall block 1 ₂ thickness ΔH of _2, retaining wall block those corresponding to the vertical width of one. and thereby, beltlike reinforcement 4 is embedded between the fill layer G _'1 and G' _2, the frictional force between the fill material G "is given.

As described above, the stacking of the retaining wall block 1, the embankment of the embankment material G ", and the laying of the belt-like reinforcing material 4 are sequentially repeated, as shown in FIGS. The embankment G having a height H is created.The uppermost stage of the retaining wall W is formed by stacking cap blocks 3. Further, as the retaining wall block 1, drainage from the embankment material G ″ to be compacted is used. The one with the drain hole 16 for opening and the one without it are piled up at appropriate intervals,
A drainage pipe (not shown) is inserted into the drainage hole 16 when the embankment layer up to that height is formed so that drainage can be performed.

In the process of forming the embankment G, the retaining wall blocks 1 ₁ , 1 ₂ ,. The slack etc. which occur in this belt-shaped reinforcing material 4 in the ground are
The tension is applied to the belt-shaped reinforcing member 4 by appropriately rotating the nut 52 of the tension-applying metal fitting 5 exposed in front of the retaining wall blocks 1 ₁ , 1 ₂ ,.

After the formation of the embankment G is completed, when the consolidation settlement and the deformation due to the drainage of the pore water converge, the nuts 52 of the tensioning metal fittings 5 exposed to the front of each retaining wall block 1 of the retaining wall W. Is rotated in the tightening direction to apply a tensile force to the band-shaped reinforcing member 4 to forcibly apply a relative displacement between the band-shaped reinforcing member 4 and the embankment material G ″, thereby exhibiting a sufficient frictional force between the two. As a result, a large reinforcing effect on the embankment wall is obtained, and subsequent deformation of the embankment G is effectively suppressed.

By tightening the nut 52, the belt-shaped reinforcing member 4
After applying a tensile force to the nut 52, the nut 52 is prevented from corroding by filling the front concave portion 13 of each retaining wall block 1 of the retaining wall W with a mortar or other solidifying material as necessary.

In the illustrated embodiment, the embankment wall is formed almost vertically, but it is needless to say that the present invention can be applied to a case where the embankment wall is a slope. In addition, the shape of the details of the retaining wall block 1 and the tension applying metal fitting 5 and the like are not particularly limited to the illustrated forms.

[0034]

According to the present invention, the following effects are realized. (1) A large reinforcing force can be developed by forcibly giving a relative displacement between the band-shaped reinforcing material and the embankment material after the consolidation settlement and deformation of the entire embankment generated after embankment formation has converged. (2) The displacement and displacement of the retaining wall block during the construction of the embankment, or the slack of the underground belt-like reinforcement can be corrected at any time. (3) For the reasons described in (1) above, an embankment with steep wall surfaces can be created and the land can be used effectively.

[Brief description of the drawings]

FIG. 1 is a partial front view of an embankment showing an embodiment of the present invention.

FIG. 2 is a schematic partial vertical sectional view of the embankment cut along the line II-II ′ of FIG. 1;

FIG. 3 is a schematic partial horizontal sectional view of the embankment cut along the line III-III ′ of FIG. 1;

FIG. 4 is a perspective view of a retaining wall block used in the embodiment.

FIG. 5 is a perspective view of a base block and a cap block used in the embodiment.

FIG. 6 is a cross-sectional perspective view showing a connection state with a retaining wall block in a case where the belt-shaped reinforcing member is made of a sheet or a net in the embodiment.

FIG. 7 is a cross-sectional perspective view showing a connection state with a retaining wall block in a case where the belt-shaped reinforcing member is made of a steel plate in the embodiment.

FIG. 8 is a schematic partial horizontal cross-sectional view showing a state in which the retaining wall block and the belt-like reinforcing material are connected using a connecting rod in the embodiment.

FIG. 9 is a vertical cross-sectional view showing a step of leveling a land to be embanked and forming a formation base in the embodiment.

FIG. 10 is an explanatory diagram showing a state where the first-stage retaining wall blocks are stacked in the embodiment.

FIG. 11 is an explanatory view showing a process of forming the first-stage embankment layer.

FIG. 12 is an explanatory view showing a completed state of the first-stage embankment layer.

FIG. 13 is an explanatory view showing a state in which a belt-like reinforcing material is laid on the first-stage embankment layer and connected to a retaining wall block.

FIG. 14 is an explanatory view showing a state where a second-stage retaining wall block is stacked on the first-stage retaining wall block.

FIG. 15 is an explanatory diagram showing a state in which a second-stage embankment layer is formed on the first-stage embankment layer.

FIG. 16 is an explanatory view showing an example of a conventional reinforcing embankment wall method.

[Explanation of symbols]

1,1 _1, 1 ₂ a retaining wall block 15 mounting holes 4 beltlike reinforcement 4 'sheet or net 4 "steel 43 connecting rod 5 tensile force imparted brackets 51 eyebolt 52, 55 nut 54 bolt G embankment ground G' ₁ ~G ' _n embankment layer G "embankment material

Claims (3)

[Claims] 1. A step of assembling a required number of retaining wall blocks on a portion serving as an embankment wall when embankment of an embankment layer having a predetermined thickness in forming an embankment including a plurality of embankment layers; A plurality of belt-like reinforcing materials are laid in a direction substantially orthogonal to the embankment wall, and a bolt passing through a mounting hole of the retaining wall block and a nut screwed to an outer end of each of the retaining wall blocks are provided. A step of connecting the band-shaped reinforcing material via a tensile force-imparting metallization, and a step of embedding the band-shaped reinforcing material in an embankment by embankment of an upper embankment layer of the embankment layer; and A timely application of a tensile force to the belt-like reinforcing material in the embankment. A reinforced embankment wall method using a retaining wall block. 2. A reinforced embankment method using a retaining wall block according to claim 1, wherein the belt-shaped reinforcing material is selected from a band-shaped cloth, a net or a metal plate made of a polymer material. 3. The connecting rod according to claim 1, wherein the connecting rod is locked over the tensile force-imparting metal fittings provided on each of the plurality of retaining wall blocks adjacent to each other. A reinforced embankment wall construction method using a retaining wall block, wherein the method is connected to the tensile force-imparting fitting via the connecting rod.