JP7323931B2 - Embankment raising structure and construction method of embankment raising structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure for raising embankment and a method for constructing a structure for raising embankment, and more particularly, construction of a structure for raising embankment and construction of a structure for raising embankment that facilitates embankment raising work. Regarding the method.

In some cases, the existing embankment is raised by continuously disposing precast concrete embankment raising structures at the crest position of the existing embankment along the extension direction of the embankment. As such a precast concrete embankment raising structure, for example, a configuration as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2018-178644) is known.

Japanese Patent Application Laid-Open No. 2018-178644 (claim 1, paragraphs 0019-0023 of the specification, FIGS. 6-8, etc.)

As shown in FIG. 14, the embankment raising structure disclosed in Patent Document 1 is considerably heavy because the bottom plate and the standing wall are integrally formed, and it is difficult to install the embankment on the crest of the embankment. A large crane is required. As long as the crest width of the embankment to be raised is sufficiently secured, a large crane can be installed, so construction can be carried out without any problems. However, it is often difficult to install a large crane at a site where the crest width of the embankment to be raised cannot be secured sufficiently, and a structure for raising the embankment as disclosed in Patent Document 1 is adopted. There is a problem that there are restrictions on the site where it can be done.

The present invention is intended to solve the above problems, and a structure for raising a bank and a bank that can be easily installed even on a bank with a narrow crest width where it is difficult to install a large crane. An object of the present invention is to provide a method for constructing a structure for raising.

That is, the present invention comprises a plate-shaped bottom plate made of reinforced concrete, and standing wall blocks that are stacked in a required width along one of the outer peripheral edges of the bottom plate to form a standing wall, and the bottom plate The required width portion in is formed in a projection projecting in the height direction from the upper surface of the bottom plate, and a reinforcing bar projects upward from the upper surface of the projection, and the standing wall block has: A structure for raising embankment, characterized by comprising a reinforcing bar insertion hole through which the reinforcing bar is inserted through from an upper surface to a lower surface, and a communicating portion that communicates with the reinforcing bar insertion hole and a pair of side surfaces on the lower surface. It is a thing.

As a result, the structure for raising the embankment can be divided into the bottom plate portion and the standing wall portion, so installation of a large crane becomes unnecessary, and the embankment can be easily raised even if the crest width is narrow. can be done.

In addition, it is preferable that the standing wall block is formed by an immediate removal formwork.

As a result, the weight of the upright wall blocks can be reduced, and the work of stacking the upright wall blocks on the bottom plate can be made easier.

Further, it is preferable that reinforcing bar insertion recesses formed over the upper surface and the lower surface and through which the reinforcing bars are inserted are provided at both end portions of the communicating portion.

As a result, it is possible to form a space for inserting reinforcing bars in the abutting portions of the adjacent standing wall blocks in the same stacking level, thereby further enhancing the integrity of the bottom plate and the standing wall.

In addition, it is preferable that the reinforcing bars protrude with a height corresponding to the number of stacked wall blocks.

As a result, the number of stacked wall blocks to be stacked on the bottom plate can be easily grasped, and the embankment raising work can be carried out more easily.

Further, at the crest of the embankment, the projecting part of the bottom plate in the embankment raising structure according to any one of claims 1 to 3 is installed in parallel with the shoulder line on the river side. a step of stacking the upright wall blocks in the embankment raising structure according to claim 1 or 2 in a state in which the reinforcing bars projecting from the protrusion are inserted into the reinforcing bar insertion holes at the protrusion; The bottom plate and the standing wall block are stacked by repeating the step of stacking the standing wall blocks until the number of stacked tiers of the standing wall blocks reaches a required number of tiers, and filling the reinforcing bar insertion hole and the communicating portion with a filler. There is an invention of a method for constructing a structure for raising embankment characterized by having an integration step of integrating.

As a result, the structure for raising the embankment can be divided into the bottom plate portion and the standing wall portion, so installation of a large crane becomes unnecessary, and the embankment can be easily raised even if the crest width is narrow. can be done.

Further, at the crest of the embankment, the projecting part of the bottom plate in the embankment raising structure according to any one of claims 1 to 3 is installed in parallel with the shoulder line on the river side. and a step of inserting the reinforcing bars protruding from the protruding portion into the reinforcing bar insertion hole and the reinforcing bar insertion recess, respectively, in the upright wall block of the embankment raising structure according to claim 3. a step of stacking upright wall blocks until the number of stacked tiers of the upright wall blocks reaches the required number of tiers; An integration step of integrating the bottom plate and the upright wall block is also provided.

As a result, the structure for raising the embankment can be divided into the bottom plate portion and the standing wall portion, so installation of a large crane becomes unnecessary, and the embankment can be easily raised even if the crest width is narrow. can be done. In addition, spaces for inserting reinforcing bars can also be formed in the abutting portions of the adjacent standing wall blocks in the same stacking level, so that the integrity of the bottom plate and the standing walls can be enhanced.

Further, the height of the reinforcing bars protruding from the protruding portion is set to a height corresponding to the required number of stacking stages, and in the erecting wall block stacking step, the position of the upper end portion of the reinforcing bars is set to the protruding portion. Preferably, it is repeated until it fits into the reinforcing bar insertion hole of the standing wall block stacked up.

This facilitates the work of stacking upstanding wall blocks.

In the present invention, since the embankment raising structure can be divided into the bottom plate portion and the standing wall portion, the installation of a large crane becomes unnecessary, and the embankment can be easily raised even if the crest width is narrow. It can be carried out. Also, the upright wall blocks piled up on the bottom plate are reliably integrated with each other, so that the embankment can be raised safely.

It is a front view of the bottom plate in the embankment raising structure of this embodiment. It is a top view of the bottom plate in the embankment raising structure of this embodiment. It is a right view of the bottom plate in the embankment raising structure of this embodiment. It is a left view of the bottom plate in the embankment raising structure of this embodiment. It is a front view of the standing wall block in the embankment raising structure of this embodiment. It is a top view of the standing wall block in the embankment raising structure of this embodiment. It is a right view of the standing wall block in the embankment raising structure of this embodiment. It is a left side view of an upright wall block in the embankment raising structure of this embodiment. It is an explanatory front view showing the construction situation of the embankment raising structure of the present embodiment. It is an explanatory front view showing the construction situation of the embankment raising structure of the present embodiment. It is an explanatory front view showing the construction situation of the embankment raising structure of the present embodiment. It is an explanatory front view showing the construction situation of the embankment raising structure of the present embodiment. It is an explanatory front view showing the construction situation of the embankment raising structure of the present embodiment. It is explanatory drawing of a prior art.

The present invention will be described in detail below based on embodiments. 1 to 4 are explanatory diagrams of the bottom plate that constitutes the embankment raising structure according to the present embodiment. 5 to 8 are explanatory diagrams of the upright wall blocks constituting the embankment raising structure in this embodiment. The embankment raising structure 100 in the present embodiment includes a bottom plate 10 formed in a plate shape, and an upright wall 30 which is stacked in a required width portion along one of the outer peripheral edges of the bottom plate 10 to form an upright wall 30. a block 20;

The bottom plate 10 in this embodiment is made of precast reinforced concrete. As shown in FIGS. 1 to 4, in the bottom plate 10 of the present embodiment, the length of the first outer peripheral edge 12 on the side (river side) where the standing wall 30 is formed faces the first outer peripheral edge 12. It is formed in a substantially trapezoidal planar shape longer than the second outer peripheral edge 14 . By adopting such a trapezoidal bottom plate 10, it becomes easy to deal with a curve in the installation extension direction of the embankment raising structure 100. As shown in FIG.

The required width range along the first outer peripheral edge 12 on the upper surface of the bottom plate 10 is formed in a protruding portion 16 which protrudes in the height direction in the length direction of the first outer peripheral edge 12 and has a flat upper surface forming a horizontal surface. . By providing such protrusions 16, the stacking position of the standing wall blocks 20 on the bottom plate 10 can be clarified. In addition, it becomes easier to stack the upright wall blocks 20 in the direction orthogonal to the upper surface of the bottom plate 10 (the crest 210 of the embankment 200; see FIG. 12), so that workability can be improved.

From the upper surface of the protruding portion 16, a part of the reinforcing bars 18 of the reinforced concrete of the bottom plate 10 protrude upward at a plurality of locations with required intervals. By partially embedding the reinforcing bars 18 in the width direction of the bottom plate 10 in this way, the pulling strength of the reinforcing bars 18 can be greatly increased. Also, the height of the reinforcing bars 18 protruding from the projecting portion 16 can be appropriately adjusted in accordance with the stacking height of the standing wall blocks 20 stacked on the bottom plate 10 . The height position of the upper end of the reinforcing bar 18 in the present embodiment is set to a height position equal to or more than two thirds of the height of the upright wall block 20 on the fourth tier, which is the highest tier. Thus, by confirming the height position of the upper end of the reinforcing bar 18 after stacking the standing wall blocks 20, the operator can determine whether or not to stack the standing wall blocks 20 further, thereby facilitating the stacking process of the standing wall blocks 20. become.

The standing wall block 20 in this embodiment is made of plain concrete. Of the side surfaces that are the upright surfaces of the upright wall blocks 20, the upright surfaces on the road side, which are the inner side surfaces of the side surfaces parallel to the installation extension of the embankment raising structure 100, can be formed as decorative surfaces. Further, if the upright surface of the upright wall block 20 on the river side, which is the outer side surface of the upright wall block 20, is formed as a smooth surface as in the present embodiment, the flow of water can be made smooth during a flood. Conversely, if the upright surface of the upright wall block 20 on the river side is formed as a rough surface (decorative surface), the appearance of the embankment raising structure 100 can be improved.

The upright wall block 20 is formed with a plurality of reinforcing bar insertion holes 22 extending from the upper surface to the lower surface and through which the reinforcing bars 18 of the bottom plate 10 are inserted at predetermined intervals in the longitudinal direction. Among the side surfaces of the standing wall block 20, a pair of side surfaces (both ends of the communication portion 24 described later) perpendicular to the installation extension direction of the embankment raising structure 100 are provided with reinforcing bars whose opening surfaces of the reinforcing bar insertion holes 22 are half open. The insertion recess 22A may be formed over the upper and lower surfaces of the upright wall block 20 . A through-hole similar to the reinforcing-bar through-hole 22 is formed by abutting the reinforcing-bar through-holes 22A formed at both ends of the standing wall blocks 20 adjacent in the installation extension direction of the embankment raising structure 100.

Further, as shown in FIG. 5, the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A are formed so that the opening area (opening width) of the upper side opening is larger than the opening area (opening width) of the lower side opening. You can also By adopting such a form of the reinforcing bar insertion holes 22 and the reinforcing bar insertion recesses 22A, it is possible to manufacture the erecting wall block 20 by immediate demolding, and the weight of the erecting wall block is reduced, making the installation work easier. can be made easier. When the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A are filled with a filling 28 (FIG. 13) represented by mortar or the like, the filling 28 is exposed at the top side opening of the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A. and the upper standing wall block 20 is increased.

In addition, on the lower surface of the upright wall block 20, communicating portions 24 are formed that communicate with the opposing reinforcing bar insertion recesses 22A and the reinforcing bar insertion holes 22 provided therebetween. In the present embodiment, a semicircular groove body is used as the communicating portion 24, but the specific shape of the communicating portion 24 is not particularly limited. The communication portion 24 is also filled with the filler 28 that fills the reinforcing bar insertion holes 22 and the reinforcing bar insertion recesses 22</b>A. As a result, it is possible to integrate the standing wall blocks 20 and the reinforcing bars 18 and to integrate the standing wall blocks 20 adjacent to each other in the installation extension direction of the embankment raising structure 100. Object 100) can be assembled.

Positioning projections 26 for aligning the stacking positions of the standing wall blocks 20 are provided on the upper surfaces of the standing wall blocks 20 in this embodiment. The positioning projection 26 in the present embodiment is formed to have a width dimension and a height dimension that allow the end surface of the positioning projection 26 to be fitted to the outer peripheral edge of the opening in the width direction of the communicating portion 24 . A recess for fitting with the end surface of the positioning protrusion 26 may be formed in the outer peripheral edge of the opening in the width direction of the communicating portion 24 .

Next, a method for constructing the embankment raising structure 100 according to the present embodiment will be described with reference to FIGS. 9 to 13. FIG. As shown in FIG. 9, the builder shapes the crest 210 of the existing embankment 200 to be raised, constructs the foundation crushed stone 220 and leveling concrete 230, and lays mortar 240 on the leveling concrete 230. Laying (top shaping process). Depending on the condition of the crown 210, at least one of the basic crushed stone 220, leveling concrete 230, and floor mortar 240 may be omitted. Next, as shown in FIG. 10, the bottom plate 10 made of precast reinforced concrete is installed at a predetermined position on the floor mortar 240 (bottom plate installation step). Here, the projecting portion 16 of the bottom plate 10 is placed on the floor mortar 240 in a state substantially parallel to the shoulder line of the embankment 200 . Since the weight of the bottom plate 10 is much lighter than that of the conventional product, the installation work of the bottom plate 10 can be performed by a truck with a crane or a backhoe capable of crane work.

In addition, the bottom plates 10 adjacent to each other in the installation extension direction of the embankment raising structure 100 are connected to connectors J embedded in the front and rear surfaces of the bottom plate 10 with parts thereof exposed as shown in FIG. They can be connected using bolts (not shown) (bottom plate connecting step). If there is a curved portion in the installation extension direction of the embankment raising structure 100, a gap (not shown) in the horizontal direction with respect to the installation extension direction may be adjusted. If a gap is formed between the adjacent bottom plates 10, it is preferable to fill the gap with a filler 28 (connecting portion gap processing step).

Next, as shown in FIG. 11, the upright wall block 20 is installed on the projecting portion 16 of the bottom plate 10 . At this time, the upright wall block 20 is in a state in which the reinforcing bars 18 standing up from the projecting portions 16 are inserted through the reinforcing bar insertion holes 22 and the reinforcing bar insertion recesses 22A. The second and subsequent standing wall blocks 20 can be stacked by fitting the positioning projections 26 of the lower standing wall blocks 20 with the communicating portions 24 formed on the lower surfaces of the standing wall blocks 20. good. In this manner, the standing wall blocks 20 are repeatedly stacked until the required number of stacking stages is reached (standing wall block stacking step).

If the height position of the upper end of the reinforcing bar 18 projecting from the projecting portion 16 is set to a height corresponding to the required number of stacking stages of the standing wall blocks 20, the work of stacking the standing wall blocks can be saved. Specifically, as shown in FIG. 12, when the upper end of the reinforcing bar 18 protruding from the projecting portion 16 of the bottom plate 10 fits into the reinforcing bar insertion hole 22 of the piled upright wall block 20, the upright wall block 20 has reached the predetermined number of stages, and the erecting wall block stacking process is completed.

Subsequently, as shown in FIG. 13, the worker fills the filler 28 such as mortar from the reinforcing bar insertion holes 22 and the reinforcing bar insertion recesses 22A. As a result, the reinforcing bars 18 inserted through the reinforcing bar insertion holes 22 and the reinforcing bar insertion recesses 22A are integrated with the upright wall blocks 20, and the vertical wall blocks 20 adjacent to each other in the longitudinal direction are integrated with each other via the communicating portions 24. (integration process). In addition, when the embankment raising structure 100 has a curved portion in the installation extension direction, a formwork for the connecting joint is installed outside the curved portion on the river side of the embankment 200, and if necessary, a water stop seal ( (not shown) may be provided and filled with the filler 28 (connection seam processing step).

As described above, the embankment raising structure 100 in which the standing wall 30 formed by the plurality of standing wall blocks 20 is integrated with the bottom plate 10 can be constructed. After the construction of the embankment raising structure 100 is completed, as shown in FIG. can also be done.

Although the embankment raising structure 100 and the construction method of the embankment raising structure 100 according to the present embodiment have been described above, the technical scope of the present invention is not limited to the above embodiments. For example, in the above embodiment, the bottom plate 10 is made of precast concrete, but the bottom plate 10 can also be made of cast-in-place reinforced concrete. By constructing the bottom plate 10 with cast-in-place reinforced concrete, it is possible to construct the embankment raising structure 100 using a small crane capable of lifting the upright wall blocks 20 . That is, the present invention can be applied even to the embankment 200 having a very narrow crest 210 .

Also, an embodiment has been described in which the height of the reinforcing bars 18 protruding from the upper surface of the projecting portion 16 of the bottom plate 10 is matched to the number of stacked wall blocks 20 stacked on the bottom plate 10, but the projecting portions 16 of the reinforcing bars 18 The protrusion height from the upper surface is not particularly limited. If the height of the reinforcing bars 18 is insufficient during the work of stacking the standing wall blocks 20, the reinforcing bars 18 can be added based on a known reinforcing bar connection method. On the contrary, if the reinforcing bar 18 has an extra height, the reinforcing bar 18 is marked at a height corresponding to the number of stages of the standing wall blocks 20 to be stacked. It is also possible to cut the reinforcing bars 18 after the work is finished or before the stacking work.

Furthermore, in the above embodiment, after stacking the standing wall blocks 20 in a predetermined number on the bottom plate 10, the reinforcing bar insertion holes 22 are filled with the filler 28 to construct the standing wall 30 integrated with the bottom plate 10. , but not limited to this form. The filling of the filler 28 into the reinforcing bar insertion holes 22 can also be performed for each stage of the standing wall blocks 20 stacked.

Furthermore, in the above embodiment, the configuration using the standing wall block 20 made of plain concrete formed by the immediate demolding formwork has been described, but the standing wall block 20 may be made of precast reinforced concrete. can also Although this increases the weight of the standing wall block 20, since it is lighter than the bottom plate 10, it does not adversely affect the installation work. Further, since the weight of the standing wall 30 can be increased, it is advantageous in that a sturdy embankment raising structure 100 can be constructed.

In the above embodiment, the existing embankment 200 is raised, but the present invention can also be applied to a newly constructed embankment 200 . In addition, the embankment raising structure 100 according to the present invention can also adopt a form in which the above-described embodiments and various modifications are appropriately combined.

10 bottom plate,
12 first outer peripheral edge, 14 second outer peripheral edge, 16 protrusion, 18 reinforcing bar,
20 standing wall blocks,
22 reinforcing bar insertion hole, 22A reinforcing bar insertion recess,
24 communicating portion, 26 positioning protrusion, 28 filling,
30 standing wall,
100 embankment raising structure,
200 Embankment,
210 top,
220 base crushed stone, 230 leveled concrete, 240 bed mortar,
J connector, M embankment

Claims (7)

a bottom plate formed in a plate shape from reinforced concrete;
an upright wall block that is stacked in a required width portion along one of the outer peripheral edges of the bottom plate and forms an upright wall,
The required width portion of the bottom plate is formed in a projection projecting in the height direction from the top surface of the bottom plate, and a reinforcing bar projects upward from the top surface of the projection,
The upright wall block is formed with a reinforcing bar insertion hole through which the reinforcing bar is inserted through from the upper surface to the lower surface, and a communicating portion that communicates the reinforcing bar insertion hole with the pair of side surfaces on the lower surface. Characteristic embankment raising structure. 2. The embankment raising structure according to claim 1, characterized in that said standing wall blocks are formed by a quick stripping formwork. 3. The embankment raising structure according to claim 1 or 2, characterized in that reinforcing bar insertion recesses formed over the upper surface and the lower surface and through which the reinforcing bars are inserted are provided at both end portions of the communicating portion. The embankment raising structure according to any one of claims 1 to 3, characterized in that said reinforcing bars protrude with a height corresponding to the number of stacked stages of said standing wall blocks. a bottom plate installation step of installing the protruding portion of the bottom plate of the structure for raising the embankment according to any one of claims 1 to 3 at the crest of the embankment parallel to the shoulder line on the river side; ,
3. The upright wall blocks in the embankment raising structure according to claim 1 or 2 are piled up in a state in which the reinforcing bars projecting from the protrusion are inserted into the reinforcing bar insertion holes in the protrusion, and the upright wall a rising wall block stacking process that is repeated until the number of stacking stages of blocks reaches a required number of stacking stages;
an integration step of integrating the bottom plate and the upright wall block by filling the reinforcing bar insertion hole and the communicating portion with a filler;
A method for constructing a structure for raising an embankment, comprising: a bottom plate installation step of installing the protruding portion of the bottom plate of the structure for raising the embankment according to any one of claims 1 to 3 at the crest of the embankment parallel to the shoulder line on the river side; ,
4. The upright wall blocks in the embankment raising structure according to claim 3 are piled up in a state in which the reinforcing bars projecting from the protrusion are inserted into the reinforcing bar insertion hole and the reinforcing bar insertion recess, respectively. , a step of stacking upstanding wall blocks, which is repeated until the number of stacked tiers of the upright wall blocks reaches a required number of tiers;
an integration step of integrating the bottom plate and the upright wall block by filling the reinforcing bar insertion hole, the communicating portion, and the reinforcing bar insertion recess with a filler;
A method for constructing a structure for raising an embankment, comprising: The height of the reinforcing bars protruding from the projecting portion is set to a height that matches the required number of stacked stages,
7. The embankment according to claim 5 or 6, wherein the step of stacking the standing wall blocks is repeated until the position of the upper end of the reinforcing bar is accommodated in the reinforcing bar insertion hole of the standing wall block stacked on the projecting portion. A method for constructing a structure for raising the height.

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