JP2004238863A - Lightweight banking construction and construction method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a side wall 8 from being damaged by the compression and settlement of a lightweight banking part 5, and to efficiently construct the side wall 8 by using a simple material, in a lightweight banking construction wherein the side wall 8 is provided along the side surface of the banking part 5 wherein synthetic resin foams 3 are stacked. <P>SOLUTION: The side wall 8 is constructed by being supported by the lightweight banking part 5 in a state wherein a clearance is left between the side wall 8 and the side surface of the banking part 5 so that the banking part 5 can be displaced relatively downward with respect to the side wall 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a lightweight embankment structure having a side wall for protecting a lightweight embankment portion along a side surface of a lightweight embankment portion in which synthetic resin foams are stacked, and a construction method thereof.
[0002]
[Prior art]
Conventionally, as a lightweight embankment structure provided with side walls along the sides of the lightweight embankment portion in which the synthetic resin foam is stacked, after constructing the lightweight embankment portion, the reinforcement is applied from the side surface of the lightweight embankment portion to the upper surface, It is known that after temporarily installing a formwork outside the reinforcing bars provided on the side of the lightweight embankment, concrete covering the reinforcing bars is poured and the concrete side walls are integrated with the upper concrete floor slab. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-7-34471
[Problems to be solved by the invention]
By the way, in the case of the above-mentioned conventional lightweight embankment structure, the side wall is formed integrally with the upper concrete floor slab and the lightweight embankment portion. For this reason, for example, when a road is formed on a lightweight embankment, if the lightweight embankment is compressed and sunk by the load of a passing vehicle or the like, the side wall cannot follow the depression and causes cracks or deformation. In addition, the side surface of the lightweight embankment bulges outward due to its compression and settling, and being pushed by this also causes cracks and deformation of the side wall.
[0005]
On the other hand, the side wall in the conventional lightweight embankment structure is generally constructed as a strong one in consideration of the earth pressure applied to the side wall. For example, when constructing a lightweight embankment for a road on a slope, the H steel that has been driven into the valley is keyed into the hill and an anchor is driven into the hill and pulled with a wire to reinforce the earth pressure resistance. A concrete panel is fitted between the H steel. For example, the side walls are fixed by being fixed.
[0006]
However, in recent years, it has become clear that when a lightweight embankment is formed by stacking synthetic resin foams, almost no earth pressure is applied to the side walls as long as the stacking can be performed stably. For this reason, when constructing a lightweight embankment by stacking synthetic resin foams, large heavy machinery and a strong scaffold are required for construction.The strong side walls as in the past are not only wasteful but also have a large own weight. However, there is also a problem that the inertia force becomes large during an earthquake, and that consideration must be given to earthquake resistance.
[0007]
The present invention has been made in view of the above-mentioned conventional problems, and in a lightweight embankment structure in which side walls are provided along side surfaces of a lightweight embankment portion in which synthetic resin foams are stacked, It is an object of the present invention to prevent damage and to efficiently construct the side wall with a simple material.
[0008]
[Means for Solving the Problems]
To this end, the present invention provides a lightweight embankment structure in which side walls are provided along side surfaces of a lightweight embankment portion in which synthetic resin foams are stacked, wherein a gap is formed between the side surface of the lightweight embankment portion and the side wall. The present invention also provides a lightweight embankment structure in which the side wall is supported by the lightweight embankment portion in a state where the lightweight embankment portion can be shifted downward relative to the side wall.
[0009]
According to the present invention, a support fitting attached to a synthetic resin foam constituting the lightweight embankment protrudes from a side surface of the lightweight embankment, and the support and the side wall are connected with play at least in an upward direction. is being done,
The support fitting is sandwiched and attached between the upper and lower synthetic resin foams, and at least on one side, a stopper that defines an end face position of the synthetic resin foam stacked on the support fitting or a mark indicating the end face position is provided. Having
The support fitting has a vertically protruding claw portion, and this claw portion is pierced by upper and lower synthetic resin foams,
An intermediate concrete floor slab is sandwiched between the synthetic resin foams constituting the lightweight embankment portion, and a support bracket attached to the intermediate concrete floor slab protrudes from the side surface of the lightweight embankment portion. And are connected with play in the vertical direction,
The side wall is composed of a large number of panel materials connected vertically and horizontally, and each panel material is supported by a support,
Is included as a preferable embodiment.
[0010]
Further, the present invention provides a method for constructing a lightweight embankment structure in which side walls are provided along side surfaces of a lightweight embankment portion in which synthetic resin foams are stacked. At the same time as constructing and attaching the panel material to this support fitting with play at least in the upward direction, the construction of the lightweight embankment, the mounting of the support fitting and the attachment of the panel material to the support fitting are performed in parallel. It is possible to leave a gap between the side wall of the lightweight embankment and the side wall composed of a number of panel materials that are supported in the vertical and horizontal directions, and the lightweight embankment can be shifted downward relative to the side wall Another object of the present invention is to provide a method for constructing a lightweight embankment structure characterized by being constructed in a proper state.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a sectional view showing an example of a lightweight embankment structure according to the present invention, FIG. 2 is an enlarged sectional view around a support fitting shown in FIG. 1, and FIG. 3 is a perspective view of the support fitting.
[0013]
The lightweight embankment structure of this example is for constructing a road or the like along a slope such as a mountainous area, and a lower concrete floor slab 2 is formed on a flat surface of a ground 1 formed by excavating the slope. The synthetic resin foam 3 is stacked thereon. Further, an intermediate concrete floor slab 4 is sandwiched between the stacked synthetic resin foams 3 at appropriate intervals in the height direction, and the lightweight embankment portion 5 is formed by the synthetic resin foam 3 and the intermediate concrete floor slab 4. It is configured. An upper concrete floor slab 6 is formed on the lightweight embankment 5. Reference numeral 7 denotes a backfill soil which fills a gap between the synthetic resin foam 3 at the mountain side end and the ground 1 at the mountain side.
[0014]
The lower concrete floor slab 2 is provided to reinforce and level the surface of the ground 1 on which the synthetic resin foam 3 is piled up. And can be formed by casting concrete. When the ground 1 is strong or the pile height of the synthetic resin foam 3 is low, the lower concrete floor slab 2 is omitted because the surface of the ground 1 is merely leveled with sand or earth and sand. Can be.
[0015]
As the synthetic resin foam 3 stacked on the lower concrete floor slab 2, those having excellent strength and water resistance are preferable, and for example, polystyrene foam, polyethylene foam, polyurethane foam and the like can be used. In particular, polystyrene foam is preferred.
[0016]
As the synthetic resin foam 3, a block-shaped molded product is usually used, but may be obtained by in-situ foaming. In the case of in-situ foamed synthetic resin foam 3, the stacked state of synthetic resin foam 3 can be obtained by repeatedly injecting the undiluted solution and foaming and curing to form a plurality of layers. However, from the viewpoint of workability, the above-mentioned block-like one is preferable. The block-shaped synthetic resin foam 3 may be formed by extrusion molding or bead foam molding, but is preferably formed by extrusion foaming in terms of strength.
[0017]
The intermediate concrete slab 4 is provided for stabilizing the stacked state of the synthetic resin foam 3 and reinforcing the load by dispersing the load. The intermediate concrete slab 4 is provided with reinforcing bars on the synthetic resin foam 3 stacked to a predetermined intermediate height. It can be formed by casting concrete. The intermediate concrete floor slab 4 is interposed as needed, and can be omitted when the pile height of the synthetic resin foam 3 is not so high.
[0018]
The upper concrete floor slab 6 forms a road surface, protects the synthetic resin foam 3 from the impact of a passing vehicle, and disperses the load. After forming the lightweight embankment 5 to a required height, It can be formed by arranging reinforcement on the topmost synthetic resin foam 3 and casting concrete.
[0019]
On the other hand, the side wall 8 is formed along the side surface exposed to the valley side of the lightweight embankment portion 5. The side wall 8 is for protecting the exposed synthetic resin foam 3 from sunlight, fire, wind and rain, etc., and is formed so as to cover the exposed surface on the valley side of the lightweight embankment 5.
[0020]
The side wall 8 is formed by connecting a large number of panel materials 9 vertically and horizontally, leaving a gap between the side wall 8 and the lower concrete floor slab 2 extending to the valley side. From the side of the lightweight embankment 5. Each of the panel members 9 forming the side wall 8 extending vertically and horizontally is supported by a support fitting 10 projecting from a side surface of the lightweight embankment portion 5. In addition, even when the lower concrete floor slab 2 is omitted, it is preferable to form a foundation on the ground 1 directly below the side wall 8 with concrete in order to facilitate connection with the lower end of the side wall 8. In this example, the lower concrete floor slab 2 is formed also as this foundation.
[0021]
As shown in FIGS. 2 and 3, the main part of the support fitting 10 has an L-shape in which a distal end of a long plate-shaped support piece 11 is bent upward to form a mounting piece 12. Further, a claw portion 13 protruding up and down is provided at a rear end portion of the support piece 11, and a plate-like stopper 14 protruding upward is provided at an intermediate portion of the support piece 11. As shown in FIG. 2 in particular, the support fitting 10 has the rear portion of the support piece 11 sandwiched between the upper and lower synthetic resin foams 3 and is attached by piercing the claws 13 into the upper and lower synthetic resin foams 3. ing.
[0022]
The support fitting 10 pierces the lower synthetic resin foam 3 with the downward claw portion 13 and temporarily fixes the lower synthetic resin foam 3, and loads the upper synthetic resin foam 3 from above to apply a load, thereby forming the upward claw portion 13. Is pierced into the upper synthetic resin foam 3 and sandwiched between the upper and lower synthetic resin foams 3 to be localized. If the stopper 14 is provided, the end face position can be defined when the upper synthetic resin foam 3 is overlapped, and the work becomes easier. When the stopper 14 is projected downward at an intermediate portion of the support piece 11 as shown by a broken line in FIG. 3, the downward claw portion 13 is pierced into the lower synthetic resin foam 3 to be temporarily fixed. Positioning is facilitated. The stopper 4 can be provided either upward or downward, or both. However, the work can be easily performed by simply providing a positioning mark such as a line indicating the end face position instead of the upward stopper 4. Can be
[0023]
FIG. 2 shows a state in which the support fitting 10 is attached to the synthetic resin foam 3. However, when the lightweight embankment 5 includes the intermediate concrete floor slab 4 as in the example shown in FIG. It can also be attached to the intermediate concrete floor slab 4. For attachment to the intermediate concrete floor slab 4, for example, as shown in FIG. 1, after temporarily fixing on the lower synthetic resin foam 3 in the same manner as described above, concrete is poured onto the lower surface and the intermediate concrete This can be performed by forming the floor slab 4. Further, the mounting of the support fitting 10 to the intermediate concrete floor slab 4 is performed using, for example, a bolt buried with the tip protruding from the intermediate concrete floor slab 4, or the rear part of the support piece 11 is filled with the intermediate concrete floor slab 4. It can also be carried out by burying it in a thickness and projecting the front part of the support piece 11 and the mounting piece 12 from the side end surface of the intermediate concrete floor slab 4.
[0024]
As shown in FIGS. 2 and 3, the mounting piece 12 of the support fitting 10 has a vertically long oblong hole 15. In particular, as shown in FIG. 2, a mounting bolt 16 that penetrates the panel material 9 constituting the side wall 8 from the outer surface side passes through the oblong hole 15 with play at the top. The mounting bolt 16 is fixed to the panel member 9 by a fastening nut 17 screwed from the inner surface side of the panel member 9. A washer 18 is inserted into the tip of the mounting bolt 16 protruding from the oblong hole 15, and a connection nut 19 is further screwed in to connect the mounting bolt 16 to the mounting piece 12 of the support fitting 10.
[0025]
Since each panel material 9 constituting the side wall 8 is supported by the lightweight embankment portion 5 via the support fitting 10 and the mounting bolt 16 as described above, the panel material 9 shifts to the mountain side and the valley side to the left and right or falls. Fixed against. However, since the mounting bolt 16 penetrates the oblong hole 15 of the mounting piece 12 with play at the top, the lightweight embankment portion 5 is compressed and settles, and the mounting piece 12 of the support fitting 10 moves downward. However, the structure is such that the position of the mounting bolt 16 is merely shifted to the upper end side of the oval hole 15 and a load is not applied to the side wall 8. That is, the side wall 8 is supported by the lightweight embankment 5 in a state where the lightweight embankment 5 can be shifted downward relative to the side wall 8. The side wall 8 can be prevented from being damaged by a downward load. Even if the synthetic resin foam 3 of the lightweight embankment 5 is compressed and its valley-side end face bulges outward, a gap is formed between the lightweight embankment 5 and the side wall 8. It is also possible to prevent the side wall 8 from being pushed to the valley side and damaged by the protrusion.
[0026]
As the panel material 9 constituting the side wall 8, for example, a precast concrete plate or the like can be used. However, if the keystone plate or the deck plate is used in a horizontally long state, it is economical. By reducing the inertial force of the vehicle, the earthquake resistance can be improved. Further, as the panel member 9, a plate member having a lath net attached to the outer surface side of a plate member made of wood, iron, light metal, or the like may be used, and after attaching the lath net surface, mortar may be sprayed on the lath net surface to finish the panel.
[0027]
The support fitting 10 in the above example has the claw portions 13 projecting up and down, but the claw portions 13 may be only those facing downward. However, in order to easily obtain a stable mounting state of the support fitting 10, it is preferable to provide the claw portions 13 in both upper and lower directions. The length of the support piece 11 of the support fitting 10 can be adjusted according to the required mounting strength of the support fitting 10 because the longer the support piece 11 is, the easier it is to obtain a strong mounting state of the support fitting 10. When the length of the support piece 11 of the support fitting 10 is increased, the claw portion 13 may be provided at an intermediate portion thereof, or the claw portion 13 may be provided at a plurality of locations.
[0028]
As shown in FIG. 1, in the upper concrete floor slab 6 in the present example, the valley side protrudes up to the side wall 8 so that the road width can be maximized. A gap is provided between the projecting lower surface of the upper concrete floor slab 6 and the top surface of the side wall 8 so as not to press the upper end of the side wall 8. This gap can be closed by a joint capable of absorbing at least the movement of the upper concrete floor slab 6 in a downward direction, an elastic packing capable of compressive deformation, or the like. In addition, since the upper concrete floor slab 6 is not protruded above the side wall 8, it is possible to prevent the upper concrete floor slab 6 from pressing the top of the side wall 8 due to the compression settlement of the lightweight embankment 5.
[0029]
When constructing the lightweight embankment structure according to the present invention, the lightweight embankment portion 5 is constructed while sequentially attaching the supporting metal fittings 10 to necessary places, and the panel material 9 is sequentially attached to the supporting metal fittings 10 to construct the lightweight embankment portion 5. It is preferable that the mounting of the supporting member 10 and the mounting of the panel member 9 to the supporting member 10 are performed in parallel. Particularly when constructing the high lightweight embankment 5, if the side wall 8 is constructed after the construction of the lightweight embankment 5, the valley side construction must be performed from above the constructed high lightweight embankment 5, and in some cases, the scaffolding However, if the side wall 8 is constructed in parallel with the construction of the lightweight embankment portion 5 as described above, the installation of such a scaffold can be omitted or minimized. Construction becomes possible.
[0030]
As the support fitting 10, one as shown in FIG. 4 can also be used. In the support fitting 10 shown in FIG. 4, a pin hole 20 is provided in the support piece 11 instead of the claw portion 13 (see FIG. 3), and the mounting pin 21 is connected to the lower synthetic resin foam through the pin hole 20. 3 (see FIG. 2). The mounting pin 21 may be a rod-shaped body with a sharp pointed head or a peg-shaped body. However, a pin having a return portion to make it difficult to pull out or a screw-type body that is easily detachable is preferable. In FIG. 4, the same symbols as those in FIG. 3 indicate the same members or parts.
[0031]
At the time of mounting the support fitting 10, as shown in FIG. 5, a receiving groove 22 having a depth corresponding to the thickness of the support piece 11 of the support fitting 10 is provided on the upper surface of the lower synthetic resin foam block 3. When the support piece 11 of the support fitting 10 is placed in the receiving groove 22, unevenness in thickness (height) caused by sandwiching the support fitting 10 between the synthetic resin foams 3 can be prevented.
[0032]
Further, as shown in FIG. 6, the depth of the groove 22 for accommodating the support piece 11 of the support fitting 10 is made larger than the thickness of the support piece 11, and the support piece 11 is accommodated in the receiving groove 22 so as to be supported. By temporarily fixing the fixing member 10 with the claw 13 and then pouring the fixing concrete 23 into the receiving groove 22, the mounting strength of the support fitting 10 to the synthetic resin foam 3 can be improved. In this case, the stopper 14 can function as a trough-side formwork when the fixing concrete 23 is poured into the receiving groove 22.
[0033]
【The invention's effect】
The present invention is as described above, and has the following effects.
[0034]
(1) Since the lightweight embankment can be shifted downward relative to the side wall, even if the lightweight embankment compresses and sinks over time, the lightweight embankment and the side wall only shift relatively up and down. No load is applied to push down the side wall. Further, since a gap is formed between the side surface of the lightweight embankment portion and the side wall, even if the lightweight embankment portion is compressed and the side surface bulges outward, the side wall is not pressed by this. Therefore, it is possible to prevent the side wall from being damaged due to the compression settlement of the lightweight embankment.
[0035]
(2) Since the side wall is supported by the lightweight embankment, there is no need for a strong structural member to be self-supporting, and the side wall can be weighed, so that the side wall can have a small inertial force during an earthquake. It is possible to improve the performance.
[0036]
(3) As described above, since a strong structural member is not required for the side wall, it can be easily constructed without using a heavy machinery.
[0037]
(4) A general-purpose material such as a keystone plate or a deck plate can be used as a constituent material of the side wall, and the cost can be significantly reduced.
[0038]
(5) The side wall can be constructed in parallel with the construction of the lightweight embankment portion, and the construction of the side wall can be efficiently performed with the installation of the scaffold omitted or minimized.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an example of a lightweight embankment structure according to the present invention.
FIG. 2 is an enlarged cross-sectional view around a support fitting shown in FIG.
FIG. 3 is a perspective view of a support fitting shown in FIG. 1;
FIG. 4 is a perspective view showing another example of the support fitting.
FIG. 5 is a cross-sectional view showing another example of a state in which a support fitting is attached to a synthetic resin foam constituting a lightweight embankment.
FIG. 6 is a cross-sectional view showing still another example of a state in which a support bracket is attached to a synthetic resin foam constituting a lightweight embankment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground 2 Lower concrete slab 3 Synthetic resin foam 4 Intermediate concrete slab 5 Light-weight embankment part 6 Upper concrete slab 7 Backfill soil 8 Side wall 9 Panel material 10 Supporting bracket 11 Supporting piece 12 Mounting piece 13 Claw part 14 Stopper 15 Oval hole 16 Mounting bolt 17 Tightening nut 18 Washer 19 Connection nut 20 Pin hole 21 Mounting pin 22 Receiving groove 23 Concrete for fixing

Claims (7)

In a lightweight embankment structure in which a side wall is provided along a side surface of a lightweight embankment portion in which synthetic resin foams are stacked, a gap is formed between the side surface of the lightweight embankment portion and the side wall, and the lightweight embankment portion is positioned relative to the side wall. A lightweight embankment structure, characterized in that the side wall is supported by the lightweight embankment in a state where the embankment can be shifted downward. On the side surface of the lightweight embankment, a support fitting attached to a synthetic resin foam constituting the lightweight embankment protrudes, and that the support fitting and the side wall are connected with play at least in the upward direction. The lightweight embankment structure according to claim 1, wherein: The support fitting is sandwiched and attached between the upper and lower synthetic resin foams, and at least on one side, a stopper that defines an end face position of the synthetic resin foam stacked on the support fitting or a mark indicating the end face position is provided. The lightweight embankment structure according to claim 2, wherein the embankment has a lightweight embankment structure. The lightweight embankment structure according to claim 2 or 3, wherein the support fitting has a vertically protruding claw portion, and the claw portion is pierced by upper and lower synthetic resin foams. An intermediate concrete floor slab is sandwiched between the synthetic resin foams constituting the lightweight embankment portion, and a supporting bracket attached to the intermediate concrete floor slab protrudes from a side surface of the lightweight embankment portion. The light-weight embankment structure according to claim 1 or 2, wherein the two are connected with play in the vertical direction. The lightweight embankment structure according to any one of claims 1 to 5, wherein the side wall is formed of a large number of panel members connected vertically and horizontally, and each panel member is supported by a support. In a construction method of a lightweight embankment structure having side walls provided along side surfaces of a lightweight embankment portion in which synthetic resin foams are stacked, the lightweight embankment portion is constructed while attaching a support metal fitting protruding to the side surface of the lightweight embankment portion. By attaching the panel material to the bracket with play at least upward, the construction of the lightweight embankment, the mounting of the support bracket and the mounting of the panel material to the support bracket are performed in parallel, supported by the support bracket, up, down, left and right The side wall composed of a large number of panel materials connected to the side wall of the lightweight embankment, leaving a gap between the side wall and the lightweight embankment that can be shifted downward relative to the side wall. Construction method of lightweight embankment structure characterized by the following.

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