JP2021105263A - Structure for raising levee and construction method of structure for raising levee - Google Patents

Abstract

To provide a structure for raising a levee allowing installation operation to be easily carried out on a levee whose top end width is too narrow to install a large crane.SOLUTION: A structure 100 for raising a levee is provided with a base plate 10 formed in a plate-like shape made of reinforced concrete, and standing wall blocks 20 stacked on a required width area along one of peripheral edges of the base plate 10 and for forming a standing wall 30, wherein the required width area in the base plate 10 is formed on a projected part 16 projecting in a height direction of the base plate 10, and reinforcement bars 18 projectedly arranged upward from a top surface of the projected part 16, and steel bar through holes 22 to insert the reinforcement bars 18 from a top surface to a bottom surface and a communication part 24 communicating the steel bar through holes 22 and a pair of side surfaces in the bottom surface are formed in the standing wall block 20.SELECTED DRAWING: Figure 13

Description

The present invention relates to a method for constructing a levee raising structure and a levee raising structure. More specifically, the present invention relates to a levee raising structure and a levee raising structure capable of easily performing levee raising work. Regarding the method.

The existing levee may be raised by continuously arranging precast concrete levee raising structures at the top of the existing levee along the extension direction of the levee. As such a precast concrete embankment raising structure, for example, a configuration as disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 2018-178644) is known.

JP-A-2018-178644 (Claim 1, paragraph 0019-0023, FIGS. 6-8, etc.)

The structure for raising the embankment disclosed in Patent Document 1 has a considerable weight because the bottom plate and the upright wall are integrally formed as shown in FIG. 14, and is suitable for installation work on the top end of the embankment. A large crane is required. If the top width of the embankment to be raised is sufficiently secured, a large crane can be installed and the construction can be carried out without any problem. However, it is often difficult to install a large crane at a site where the top width of the embankment to be raised cannot be sufficiently secured, 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 sites where it can be done.

The present invention is for solving the above problems, and is a structure for raising an embankment and an embankment that can be easily installed even if the embankment has a narrow top 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 includes a bottom plate formed of reinforced concrete in a plate shape, and an upright wall block that is stacked on a required width portion along one of the outer peripheral edges of the bottom plate to form an upright wall. The required width portion in the above is formed in a protruding portion protruding from the upper surface of the bottom plate in the height direction, and a reinforcing bar is projected upward from the upper surface of the protruding portion. A structure for raising a levee, characterized in that a reinforcing bar insertion hole for penetrating the reinforcing bar from the upper surface to the lower surface and a communication portion for communicating the reinforcing bar insertion hole and a pair of side surfaces are formed on the lower surface. It is a thing.

As a result, the structure for raising the embankment can be divided into a bottom plate part and an upright wall part, so that it is not necessary to install a large crane, and even if the embankment has a narrow top width, the raising work can be easily performed. Can be done.

Further, it is preferable that the upright wall block is formed by an immediate demolding form.

As a result, the weight of the upright wall block can be reduced, and the work of stacking the upright wall block on the bottom plate can be facilitated.

Further, it is preferable that both ends of the communication portion are provided with reinforcing bar insertion recesses formed over the upper surface and the lower surface and through which the reinforcing bar is inserted.

As a result, it is possible to form a space for inserting the reinforcing bar in the contact portion with the adjacent upright wall blocks in the same number of stacking stages, and it is possible to further enhance the integrity of the bottom plate and the upright wall.

Further, it is preferable that the reinforcing bar protrudes at a height corresponding to the number of stacked stages of the upright wall block.

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

Further, at the top end of the embankment, the bottom plate is installed so that the protruding portion 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. The step and the upright wall block in the levee raising structure according to claim 1 or 2 are stacked in a state where the reinforcing bar projecting from the protruding portion at the protruding portion is inserted into the reinforcing bar insertion hole. The bottom plate and the upright wall block are formed by a step of stacking upright wall blocks that is repeated until the number of stacking steps of the upright wall blocks reaches the required number of stacking steps, and by filling the reinforcing bar insertion holes and the communication portion with a filling material. There is an invention of a method for constructing a structure for raising a levee, which is characterized by having an integration process for integration.

As a result, the structure for raising the embankment can be divided into a bottom plate part and an upright wall part, so that it is not necessary to install a large crane, and even if the embankment has a narrow top width, the raising work can be easily performed. Can be done.

Further, at the top end of the embankment, the bottom plate is installed so that the protruding portion of the bottom plate in the embankment raising structure according to any one of claims 1 to 3 is installed in parallel with the rebar on the river side. The step and the upright wall block in the levee raising structure according to claim 3 were inserted into the reinforcing bar insertion hole and the reinforcing bar insertion recess, respectively, with the reinforcing bar projecting from the protruding portion at the protruding portion. By stacking in a state and repeating the process of stacking the upright wall blocks until the number of stacking steps of the upright wall blocks reaches the required number of stacking steps, and filling the reinforcing bar insertion holes, the communication portions, and the reinforcing bar insertion recesses with a filling material. There is also an invention of a method for constructing a structure for raising a levee, which comprises an integration step of integrating the bottom plate and the upright wall block.

As a result, the structure for raising the embankment can be divided into a bottom plate part and an upright wall part, so that it is not necessary to install a large crane, and even if the embankment has a narrow top width, the raising work can be easily performed. Can be done. In addition, a space for inserting reinforcing bars can be formed in the contact portion with the adjacent upright wall blocks in the same number of stacking stages, and the integrity between the bottom plate and the upright wall can be enhanced.

Further, the projecting height of the reinforcing bar from the protruding portion is set to a height corresponding to the required number of stacking stages, and in the standing wall block stacking step, the position of the upper end portion of the reinforcing bar is the protruding portion. It is preferable that the process is repeated until it fits in the reinforcing bar insertion hole of the upright wall block stacked in the above.

This facilitates the work of stacking the upright wall blocks.

In the present invention, since the structure for raising the embankment can be divided into a bottom plate portion and an upright wall portion, it is not necessary to install a large crane, and even an embankment having a narrow top width can be easily raised. It can be carried out. In addition, the upright wall blocks stacked on the bottom plate are surely integrated with each other, and the embankment can be safely raised.

It is a front view of the bottom plate in the structure for raising embankment of this embodiment. It is a top view of the bottom plate in the structure for raising embankment of this embodiment. It is a right side view of the bottom plate in the structure for raising embankment of this embodiment. It is a left side view of the bottom plate in the structure for raising embankment of this embodiment. It is a front view of the upright wall block in the structure for raising embankment of this embodiment. It is a top view of the upright wall block in the structure for raising embankment of this embodiment. It is a right side view of the upright wall block in the structure for raising embankment of this embodiment. It is a left side view of the upright wall block in the structure for raising embankment of this embodiment. It is explanatory front view which shows the construction state of the structure for raising embankment of this embodiment. It is explanatory front view which shows the construction state of the structure for raising embankment of this embodiment. It is explanatory front view which shows the construction state of the structure for raising embankment of this embodiment. It is explanatory front view which shows the construction state of the structure for raising embankment of this embodiment. It is explanatory front view which shows the construction state of the structure for raising embankment of this embodiment. It is explanatory drawing of the prior art.

Hereinafter, the present invention will be described in detail based on the embodiments. 1 to 4 are explanatory views of a bottom plate constituting the embankment raising structure in the present embodiment. 5 and 8 are explanatory views of an upright wall block constituting the embankment raising structure in the present embodiment. The structure 100 for raising the embankment in the present embodiment is a standing wall formed by stacking the bottom plate 10 formed in a plate shape and a required width portion along one of the outer peripheral edges of the bottom plate 10 to form the standing wall 30. A block 20 is provided.

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 in the present embodiment, the length of the first outer peripheral edge 12 on the side where the upright wall 30 is formed (river side) faces the first outer peripheral edge 12. It is formed in a substantially trapezoidal planar shape formed 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.

The required width range along the first outer peripheral edge 12 on the upper surface of the bottom plate 10 is formed in the protruding portion 16 which protrudes in the height direction in the length direction of the first outer peripheral edge 12 and whose upper surface forms a flat horizontal plane. .. By providing such a protruding portion 16, the stacking position of the upright wall block 20 on the bottom plate 10 can be clarified. Further, the upright wall block 20 can be easily stacked in the direction orthogonal to the upper surface of the bottom plate 10 (top 210 of the embankment 200; see FIG. 12), and the workability can be improved.

From the upper surface of the projecting portion 16, a part of the reinforcing bars 18 of the reinforced concrete of the bottom plate 10 is projected upward at a plurality of positions at required intervals. By burying a part of the reinforcing bar 18 in the width direction of the bottom plate 10 in this way, the pull-out strength of the reinforcing bar 18 can be significantly increased. Further, the protruding height of the reinforcing bar 18 from the protruding portion 16 can be appropriately adjusted according to the stacking height of the upright 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 of two-thirds or more of the height of the fourth-stage upright wall block 20, which is the uppermost stage. As a result, the operator can determine the necessity of further stacking the standing wall blocks 20 by confirming the height position of the upper end of the reinforcing bars 18 after stacking the standing wall blocks 20, and the stacking process of the standing wall blocks 20 is easy. become.

The upright wall block 20 in this embodiment is made of unreinforced concrete. Of the side surfaces of the upright wall block 20 that are the upright surfaces, the upright surface on the road side, which is the inner side surface of the side surface parallel to the installation extension of the embankment raising structure 100, can be formed as a decorative surface. Further, if the upright surface 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 at the time of flood can be smoothed. On the contrary, 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 made in a good landscape.

Reinforcing bar insertion holes 22 for inserting the reinforcing bars 18 of the bottom plate 10 penetrating from the upper surface to the lower surface are formed in the upright wall block 20 at a plurality of positions at required intervals in the length direction. Of the side surfaces of the upright wall block 20, a pair of side surfaces (both ends of the communication portion 24, which will be described later) orthogonal to the installation extension direction of the embankment raising structure 100 are reinforced with the opening surface of the reinforcing bar insertion hole 22 halved. The insertion recess 22A may be formed over the upper surface and the lower surface of the upright wall block 20. Reinforcing bar insertion recesses 22A formed at both ends of the upright wall block 20 adjacent to the installation extension direction of the embankment raising structure 100 are abutted to form an insertion hole similar to the reinforcing bar insertion hole 22.

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 surface side opening is larger than the opening area (opening width) of the lower surface side opening. You can also do it. By adopting the form of the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A, the standing wall block 20 can be manufactured by the immediate demolding formwork, and the weight of the standing wall block is reduced, which makes the installation work easier. Can be facilitated. When the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A are filled with the filling 28 (FIG. 13) represented by mortar or the like, the filling 28 exposed to the upper surface side opening of the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A. It is advantageous in that the adhesion portion between the upper side and the upright wall block 20 is increased.

Further, on the lower surface of the upright wall block 20, a communication portion 24 is formed which communicates the reinforcing bar insertion recesses 22A facing each other and the reinforcing bar insertion holes 22 provided between them. In the present embodiment, a semicircular groove is used as the communication portion 24, but the specific shape of the communication portion 24 is not particularly limited. The filling 28 filled in the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A is also filled in the communication portion 24. As a result, the upright wall block 20 and the reinforcing bar 18 can be integrated, and the upright wall blocks 20 adjacent to each other in the installation extension direction of the embankment raising structure 100 can be integrated, and the strong upright wall 30 (embankment raising structure) can be integrated. The thing 100) can be assembled.

Further, on the upper surface of the upright wall block 20 in the present embodiment, a positioning protrusion 26 for aligning the stacking position of the upright wall block 20 is arranged. The positioning protrusion 26 in the present embodiment is formed to have a width dimension and a height dimension so that the end surface of the positioning protrusion 26 can be fitted to the outer peripheral edge of the opening in the width direction of the communication portion 24. A fitting recess with the end face of the positioning protrusion 26 may be formed on the outer peripheral edge of the opening in the width direction of the communication portion 24.

Subsequently, the construction method of the embankment raising structure 100 in the present embodiment will be described with reference to FIGS. 9 to 13. As shown in FIG. 9, the builder shapes the top 210 of the existing embankment 200 to be raised, constructs the foundation crushed stone 220 and the leveling concrete 230, and lays the mortar 240 on the leveling concrete 230. Lay (top shaping process). Depending on the state of the top 210, at least one of the foundation crushed stone 220, the leveled concrete 230 and the mortar 240 may be omitted. Next, as shown in FIG. 10, a precast reinforced concrete bottom plate 10 is installed at a predetermined position on the floor mortar 240 (bottom plate installation step). Here, the protruding portion 16 of the bottom plate 10 is installed 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 significantly lighter than the weight 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.

As shown in FIG. 1, the bottom plates 10 adjacent to each other in the installation extension direction of the embankment raising structure 100 are for fastening to the connecting tool J embedded in the front surface and the back surface of the bottom plate 10 with their parts exposed. It 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, the gap (not shown) in the left-right direction with respect to the installation extension direction may be adjusted. When a gap is formed between the adjacent bottom plates 10, it is preferable to fill the gap portion with the filling material 28 (connecting portion gap processing step).

Next, as shown in FIG. 11, the upright wall block 20 is installed on the protruding portion 16 of the bottom plate 10. At this time, the upright wall block 20 is in a state in which the reinforcing bar 18 standing up from the protruding portion 16 is inserted into the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A. The upright wall blocks 20 of the second and subsequent stages can be stacked by fitting the positioning protrusion 26 of the upright wall block 20 located on the lower side and the communication portion 24 formed on the lower surface of the upright wall block 20. good. In this way, 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 portion of the reinforcing bar 18 projecting from the projecting portion 16 is set to a height that matches the required number of stacking steps of the standing wall block 20, the labor saving process for stacking the standing wall block can be achieved. Specifically, as shown in FIG. 12, if the position of the upper end portion of the reinforcing bar 18 protruding from the protruding portion 16 of the bottom plate 10 fits in the reinforcing bar insertion hole 22 of the stacked standing wall block 20, the standing wall block 20 Has reached the predetermined number of stages, and the process of stacking the standing wall blocks is completed.

Subsequently, as shown in FIG. 13, the operator fills the filling material 28 such as mortar from the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A. As a result, the reinforcing bar 18 inserted into the reinforcing bar insertion hole 22 and the reinforcing bar insertion recess 22A and the standing wall block 20 are integrated, and the standing wall blocks 20 adjacent to each other in the length direction are integrated via the communication portion 24. Performed (integration process). Further, when the embankment raising structure 100 has a curved portion in the installation extension direction, a formwork for the connecting joint portion is installed outside the curved portion on the river side of the embankment 200, and a water stop seal (if necessary). (Not shown) may be arranged to fill the filler 28 (connecting seam processing step).

As described above, it is possible to construct the embankment raising structure 100 in which the upright wall 30 formed by the plurality of upright wall blocks 20 is integrated with the bottom plate 10. After the construction of the embankment raising structure 100 is completed, as shown in FIG. 13, an embankment M (bottom plate embankment process) is placed on the bottom plate 10 and a pavement (paving process) is separately placed on the bottom plate 10 or on the embankment M. You can also do it.

Although the method of constructing the embankment raising structure 100 and the embankment raising structure 100 in the present embodiment has 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 may be made of cast-in-place reinforced concrete. By constructing the bottom plate 10 with cast-in-place reinforced concrete, it becomes possible to construct the embankment raising structure 100 using a small crane capable of lifting the upright wall block 20. That is, the present invention can be applied even if the top end 210 is a very narrow embankment 200.

Further, although the embodiment in which the height of the reinforcing bar 18 projecting from the upper surface of the protruding portion 16 of the bottom plate 10 is matched with the number of stacking stages of the upright wall block 20 to be stacked on the bottom plate 10, the protruding portion 16 of the reinforcing bar 18 is described. The height of protrusion from the upper surface is not particularly limited. If the height of the reinforcing bars 18 is insufficient during the stacking work of the upright wall blocks 20, the reinforcing bars 18 can be added based on a known reinforcing bar connecting method. On the contrary, when the protruding height of the reinforcing bar 18 is extra, mark the height position of the reinforcing bar 18 according to the number of stacking steps of the standing wall block 20 and stack the standing wall block 20. Reinforcing bars 18 can also be cut after the work is completed or before the stacking work.

Further, in the above embodiment, after stacking the standing wall blocks 20 having a predetermined number of steps on the bottom plate 10, the reinforcing bar insertion holes 22 are filled with the filling material 28 to construct the standing wall 30 integrated with the bottom plate 10. , Not limited to this form. The filling 28 can be filled in the reinforcing bar insertion hole 22 for each number of stacking stages of the upright wall block 20.

Furthermore, in the above embodiment, the embodiment using the upright wall block 20 formed of unreinforced concrete formed by the immediate demolding form is described, but the upright wall block 20 is formed of precast reinforced concrete. You can also. This increases the weight of the upright wall block 20, but since it is lighter than the bottom plate 10, it does not adversely affect the installation work. Since the weight of the upright wall 30 can be increased, it is convenient in that a sturdy embankment raising structure 100 can be constructed.

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

10 bottom plate,
12 1st outer peripheral edge, 14 2nd outer peripheral edge, 16 protrusion, 18 reinforcing bar,
20 Standing wall block,
22 Reinforcing bar insertion hole, 22A Reinforcing bar insertion recess,
24 communication part, 26 positioning protrusion, 28 filling,
30 Standing wall,
100 Embankment raising structure,
200 embankment,
210 Top,
220 foundation crushed stone, 230 leveled concrete, 240 mortar,
J connector, M embankment

Claims (7)

The bottom plate formed in the shape of a plate made of reinforced concrete,
An upright wall block that is stacked on a required width portion along one of the outer peripheral edges of the bottom plate to form an upright wall is provided.
The required width portion of the bottom plate is formed in a protruding portion protruding from the upper surface of the bottom plate in the height direction, and a reinforcing bar is projected upward from the upper surface of the protruding portion.
The upright wall block is formed with a reinforcing bar insertion hole for penetrating the reinforcing bar from the upper surface to the lower surface and a communication portion for communicating the reinforcing bar insertion hole and the pair of side surfaces on the lower surface. A characteristic structure for raising the embankment. The levee raising structure according to claim 1, wherein the upright wall block is formed by an immediate demolding formwork. The structure for raising a levee according to claim 1 or 2, wherein both ends of the communication portion are provided with reinforcing bar insertion recesses formed over the upper surface and the lower surface through which the reinforcing bar is inserted. The embankment raising structure according to any one of claims 1 to 3, wherein the reinforcing bar projects at a height corresponding to the number of stacked steps of the upright wall block. A bottom plate installation step of installing the protrusion of the bottom plate in the structure for raising the embankment according to any one of claims 1 to 3 at the top of the embankment in parallel with the shoulder line on the river side. ,
The upright wall block in the levee raising structure according to claim 1 or 2 is stacked in a state where the reinforcing bar projecting from the protruding portion is inserted into the reinforcing bar insertion hole in the protruding portion, and the standing wall is stacked. The standing wall block stacking process, which is repeated until the number of stacking stages of the blocks reaches the 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 communication portion with a filling.
A method of constructing a structure for raising a levee, which is characterized by having. A bottom plate installation step of installing the protrusion of the bottom plate in the structure for raising the embankment according to any one of claims 1 to 3 at the top of the embankment in parallel with the shoulder line on the river side. ,
The upright wall block in the structure for raising the embankment according to claim 3 is stacked in a state in which the reinforcing bar projecting from the protruding portion at the protruding portion is inserted into the reinforcing bar insertion hole and the reinforcing bar insertion recess, respectively. , The standing wall block stacking process repeated until the number of stacking stages of the standing wall blocks reaches the 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, the communication portion, and the reinforcing bar insertion recess with a filling material.
A method of constructing a structure for raising a levee, which is characterized by having. The protruding height of the reinforcing bar from the protruding portion is set to a height corresponding to the required number of stacking stages.
The embankment according to claim 5 or 6, wherein the step of stacking the upright wall blocks is repeated until the position of the upper end portion of the reinforcing bar fits in the reinforcing bar insertion hole of the upright wall block stacked on the protruding portion. How to build a structure for raising.

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