JP4231346B2 - Tightening tool used for lightweight embankment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a binding tool used in a lightweight embankment method.
[0002]
[Prior art]
A light-weight embankment method using a resin foam block such as an expanded polystyrene (EPS) block as a light-weight embankment method is known as one of embankment methods on soft ground or landslide land. This construction method is widely used in various civil engineering works because it exhibits excellent effects in terms of cost reduction for ground improvement, shortening the construction period, and improving earthquake resistance. FIG. 9 is an example of a structure by a lightweight embankment method (see Patent Document 1: Japanese Patent Application Laid-Open No. 2003-74060), and an H-section steel 2 on the slope side of an existing ground where an existing road 1 is formed at the top. The EPS block 4 is piled up as a lightweight embankment material between the H-section steel 2 and the supporting ground 3 to form a lightweight embankment layer having a predetermined height. After that, the necessary reinforcement 5 is placed on the stacked EPS block 4 and concrete is cast to a predetermined thickness to construct a concrete floor slab 6. The tip of the anchor 7 embedded and fixed on the supporting ground 3 is connected to the concrete floor. Connect to plate 6 to improve stabilization. And the process of forming the road layer 10 by the roadbed 8, asphalt pavement 9, etc. on the concrete floor slab 6 like a normal civil engineering work is performed. In addition to the concrete slab 6, an intermediate concrete slab (not shown) may be provided.
[0003]
When constructing a lightweight embankment layer by arranging a large number of resin foam blocks in the left-right direction and the up-down direction, a binding tool is used to connect and stabilize the resin foam blocks adjacent in the left-right and up-down directions. Is often used. FIG. 10 is an example of a binding tool used in the lightweight embankment method (see Patent Document 2: Japanese Patent Laid-Open No. 11-6226). The binding tool 20 has a large number of insertion pieces 22a and 22b on the periphery of the flat substrate 21. It is bent toward both sides. The back surface of the resin foam block disposed on the upper stage with respect to the upward insertion piece 22b of the binding tool 20 by stabilizing the mutual insertion block by inserting a downward insertion piece 22a into the surface of the resin foam block adjacent to the left and right By piercing the side, the resin foam blocks positioned above and below are stabilized. For the uppermost resin foam block group, a binding tool having only a downward insertion piece 22a is usually used.
[0004]
[Patent Document 1]
JP2003-74060A [Patent Document 2]
Japanese Patent Laid-Open No. 11-6226
[Problems to be solved by the invention]
As shown in FIG. 10, the conventional fastener is formed by simply bending a large number of insertion piece portions formed integrally with the periphery of the flat substrate downward or upward at 90 degrees. The connecting portion between the inserted piece and the substrate (the base portion of the inserted piece) is linear. Therefore, the strength of the base part of the insertion piece is not sufficient, and depending on the physical property value of the resin foam block that is the driving destination, the stress applied to the tip of the insertion piece during driving causes deformation at or near the base part of the insertion piece. There was a case. The insertion piece itself has a flat plate shape and has a low resistance to bending and twisting, so that the above deformation tends to occur.
[0006]
FIGS. 11a and 11b schematically show a typical example when such a deformation occurs. In FIG. 11a, the force acting on the vertically inserted insertion piece 22a is affected by the insertion piece 22a, the substrate 21, and the like. The vicinity of the connecting portion (the base portion of the insertion piece) cannot be withstood, and the portion 25 is bent. In FIG. 11b, since the intrusion angle of the insertion piece 22a is not vertical, the insertion piece 22a enters obliquely with deformation, and a fold 26 is generated in the middle. For this reason, the bent portion 25 and the bent portion 26 become an obstacle, and the driving amount of the binding tool 20 becomes insufficient, and a gap S is generated between the surface of the resin foam block 4 and the substrate 21 of the binding tool 20. Can happen.
[0007]
If the resin foam blocks are stacked in multiple stages with such a gap S left, when a heavy article such as a concrete floor slab or a roadbed is installed on the lightweight embankment layer, the gap is caused by the load. Since it is buried, the subsidence of the light-weight embankment layer will occur more than necessary. When such subsidence occurs, it may be necessary to perform repair work on the roadbed or the like, which is not preferable.
[0008]
The bending part and the bent part of the base part of the insertion piece of the binding tool as described above tend to occur even when the operator performs driving preparation work at the construction site, and when used as it is, there is a gap as described above. Since it contributes to the repair work, in order to avoid it, work to correct the bent part and the bent part before driving is required. Even if it is corrected vertically, it is not easy to completely avoid the bending 25 and the bent portion 26 as shown in FIGS. If a thick material (metal plate) is used, the above disadvantages can be avoided. However, it is heavier and more expensive and is not a practical solution.
[0009]
The present invention has been made in view of the circumstances as described above, and a deformation that causes a gap between the resin foam block after driving is performed at the time of driving or during preparation work. An improved lightweight embankment binding tool that can effectively prevent subsidence caused by the tightening tool from occurring in the stacked lightweight embankment layer as much as possible. The purpose is to provide.
[0010]
[Means for Solving the Problems]
The binder used in the lightweight embankment method according to the present invention is a binder used in a lightweight embankment method in which a plurality of insertion pieces to be inserted into a resin foam block that is a lightweight embankment are formed on one side or both sides of a flat substrate. And the cross-sectional shape of the direction parallel to the board | substrate of an insertion piece is made into shapes other than a straight line at the connection part of this insertion piece and a board | substrate at least. Examples of the shape other than the straight line include a polygonal line shape, a curved line shape, or a combination of a broken line shape and a curved line shape.
[0011]
In the above-described binding tool, the base of the insertion piece, that is, the cross-sectional shape of the insertion piece at the connection portion between the insertion piece and the board is a shape other than a straight line, for example, a broken line shape, a curved shape, or a combination of a broken line shape and a curved shape Since the cross-sectional shape of the connecting portion is linear, it exhibits a high resistance to a lateral load acting on the insertion piece and does not easily deform. When the cross-sectional shape is continuous up to the distal end side of the insertion piece, it is further difficult to deform, including deformation of the insertion piece itself.
[0012]
Therefore, even if a load in an irregular direction is applied to the insertion piece or its vicinity during the preparation work or driving operation, the bending angle of the insertion piece with respect to the board does not easily change. The vertical bending posture is maintained, and there is no occurrence of bending or bending in the vicinity of the base as in the conventional binding tool. Thereby, when the binding tool is driven into the resin foam block, it is possible to reliably avoid a gap between the flat substrate and the surface of the resin foam block, and the two are in close contact with each other.
[0013]
Therefore, in a lightweight embankment in which resin foam blocks are stacked in multiple stages using the binding tool according to the present invention, when a heavy object such as a concrete floor slab or a roadbed is installed on the lightweight embankment, the amount of subsidence is the initial design value. The need for repair work on the roadbed is greatly reduced.
[0014]
The present invention has a plurality of plugs inserted into a resin foam block, which is a lightweight embankment, on one surface side of a flat substrate as another type of connecting tool (second-type fastening tool) used in a lightweight embankment method that can solve the same problem. This is a binding tool in which an insertion piece of a book is formed, and a protrusion that functions as a spacer is formed on the other side of the reinforcing bar for the concrete floor slab, and is parallel to the substrate of the insertion piece Also disclosed is a binding tool for use in a lightweight embankment method in which the cross-sectional shape in any direction is a shape other than a straight line at least at the connection portion between the insertion piece and the substrate.
[0015]
In the lightweight embankment method, a concrete slab is constructed at the top or middle position of the lightweight embankment layer. In making a concrete slab, a spacer is arranged on the surface of a resin foam block which is a lightweight embankment layer, a reinforcing bar is arranged thereon, and then concrete is placed. In addition to the operation of arranging the spacers, an operation of driving a binding tool provided with an insertion piece to stabilize adjacent resin foam blocks is also performed. The binding tool of the second embodiment is also intended to simplify the work when constructing the concrete slab.
[0016]
That is, in the lightweight embankment method, when stacking the resin foam block groups from the lowermost stage to the uppermost stage, in order to stabilize the resin foam blocks adjacent to each stage, the binding tool according to the first aspect of the present invention is used. Or using a conventionally known binding tool as shown in FIG. Of course, they may be stacked in multiple stages without using such a binding tool. The resin foam blocks adjacent to each other in the uppermost resin foam block group are struck with the fastening device of the second form so as to straddle the contact surface, and the resin foam blocks of each other are in a stable posture. To do. Since the board portion of the insertion piece has a strong strength and does not easily bend or bend, the flat plate-like board of the fastening tool is in close contact with the surface of the resin foam block after being driven. Similarly, the required number of fasteners are driven into the required location.
[0017]
When constructing a concrete floor slab, the necessary reinforcing bars are arranged using the “protrusions that function as spacers” formed in the second-type binding device driven in as described above. Work to place a separate spacer as in the conventional method by setting the height of the protrusion to such a level that the reinforcing bars placed in the concrete slab to be constructed can take the desired cover It is possible to finish arranging the required number of reinforcing bars by using the protrusions without performing the above. This greatly simplifies the work. Also, the protrusion that functions as a spacer is formed on a flat substrate with the required bottom area, so that even if the operator gets on the protrusion or the reinforcing bar during the bar arrangement work, the binding tool will sink. No, the required cover is secured stably. After finishing the necessary bar arrangement work, the concrete slab is completed by placing concrete in the same manner as in the conventional method. Of course, this aspect can also be used when constructing an intermediate concrete slab.
[0018]
In a preferred mode of the second embodiment of the binding tool, a recess for accommodating a reinforcing bar is formed at the upper end of the protrusion that functions as a spacer. By providing such a depression, the reinforcing bar can be temporarily fixed stably, and the bar arrangement operation can be stabilized and the arrangement of the bar can be prevented from being disturbed when placing concrete. .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a binding tool used in a lightweight embankment method according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an intermediate product 50A in an example of a first form of a binding tool according to the present invention, and FIG. 2 is a perspective view showing the binding tool 50 manufactured from the intermediate product 50A as viewed from above. The intermediate product 50A is a single flat plate-like body as a whole, and is made by punching from a metal plate having a thickness of about 1 to 2 mm. As shown in the figure, the intermediate product 50 </ b> A has a flat plate-like substrate 52 having bulged portions 51, 51 at the center of the upper side and the lower side, and a large number of insertion pieces 53 formed on the periphery of the substrate 52.
[0020]
The intermediate product 50A is applied to an appropriate press machine, and the peripheral insertion piece 53 is bent downward at an angle of 90 degrees. At that time, bending is performed so that the shape at the connection portion 54 of the insertion piece 53 and the substrate 52 does not become one linear shape. 1 and 2, the connecting portion 54 is formed in a shape in which two straight lines 54 a and 54 b intersect at a predetermined angle, and the shape continues to the tip of the insertion piece 53. That is, the cross-sectional shape of the insertion piece 53 in the direction parallel to the substrate 52 is a polygonal line shape composed of the same two straight lines 54a and 54b from the connection portion 54 to the tip of the insertion piece 53 and the substrate 52. ing.
[0021]
By adopting such a shape, it is possible to give a strong strength to at least the connection portion of the insertion piece 53 with the substrate 52, and even if an irregular external force is applied, it is easily bent or bent in the vicinity of the connection portion 54. Will not occur. Therefore, after the driving, it is possible to drive the binding tool 50 into the resin foam block 4 without generating the gap S as shown in FIG. Although not shown in the drawings, a binding tool obtained by bending a part of the insertion pieces 53 upward may be used.
[0022]
FIG. 3 is a plan view showing an intermediate product 60A in another example of the first form of the binding device according to the present invention, and FIG. 4 is a perspective view showing the binding device 60 manufactured from the intermediate product 60A as viewed from above. is there. Again, the intermediate product 60A is a single flat plate-like body as a whole, and is made by punching from a metal plate having a thickness of about 0.5 to 2 mm. The intermediate product 60 </ b> A includes a rectangular substrate 62 and a large number of insertion pieces 63 a and 63 b formed on the periphery of the substrate 62. Insertion pieces 63a and 63b having substantially the same shape are formed on one side of the substrate 62 so as to be separable by an intermediate line 64, and the distal end sides of the insertion pieces 63a and 63b have an uneven shape.
[0023]
The intermediate product 60A is applied to a suitable press, and one insertion piece 63a is bent upward and the other insertion piece 63b is bent downward at an angle of 90 degrees. At that time, the connecting pieces 65 of the insertion pieces 63a and 63b and the substrate 62 are bent upward and downward so that the shape of the connection portion 65 is substantially the same as the concave and convex shape at the tip of the insertion piece. Thereby, the cross-sectional shape of each insertion piece 63 in the direction parallel to the substrate 62 is substantially the same polygonal line shape from the connection portion 65 to the tip of the insertion piece 63 with the substrate 62. Also in this aspect, it is possible to give a strong strength to the connection portion between the insertion piece 63 and the substrate 62, and even when an irregular external force is applied, no bending or bending portion is generated in the vicinity of the connection portion 65. In this example, since the tip of the insertion piece 63 has an uneven shape, the initial driving operation is facilitated compared to a flat tip surface.
[0024]
FIG. 5 is a perspective view seen from above showing still another example of the first form of the binding device according to the present invention. In the binding tool 70, the shape of the connecting portions 75 of the insertion pieces 73a and 73b and the substrate 72 is a curved shape, and the shape continues to the tip of the insertion piece 73. Moreover, the front-end | tip of insertion piece 73a, 73b is linear form. The other structure is the same as that of the binding tool 60 shown in FIGS. Although not shown, the connecting portion between the insertion piece and the substrate may be a combination of the curved shape shown in FIG. 5 and the polygonal line shape shown in FIG.
[0025]
FIG. 6 is a perspective view of the binding device 501 in the second embodiment of the binding device according to the present invention as seen from above. The binding device 50 shown in FIG. The protrusion 56 which functions as a spacer with respect to the reinforcing bar is different in that it protrudes in the direction opposite to the insertion piece 53. The protrusion 56 is formed by raising four substrate portions a sandwiched between the two cuts 55 and 55 at a required upper angle by using the cut 55, and a recess 57 at the tip thereof. Is formed. Such a protrusion 56 can be formed at the same time as the driving piece 53 is bent. What is necessary is just to set the height of the protrusion 56 suitably in consideration of the thickness of the concrete floor slab to be constructed.
[0026]
FIG. 7 is a perspective view showing the binding device 502 in another example of the second configuration of the binding device according to the present invention as seen from above. The binding tool 502 and the binding tool 501 shown in FIG. 6 are configured such that the upper end surface of the protrusion 56a that functions as a spacer with respect to the reinforcing bar for the concrete floor slab formed at the center of the substrate 52 is a flat surface. There is a difference in that a plurality of concave grooves 57a are formed so as to intersect at 90 degrees. The concave groove 57a is used for arranging reinforcing bars of a concrete floor slab. The protrusion 56a having such a flat surface and a concave groove can be easily punched out from the substrate 52 by press working.
[0027]
FIG. 8 partially shows an example of a lightweight embankment structure constructed using the second binding tool 502 according to the present invention. In the same manner as described with reference to FIG. 9, resin foam blocks 4 such as foamed polystyrene blocks are stacked in multiple stages to form a lightweight embankment layer. In the stacking of the resin foam block groups from the lowermost stage to the uppermost stage, in order to stabilize the resin foam blocks 4 adjacent to each stage, the binding of any one of the first forms shown in FIGS. The tool 50 or an appropriate binding tool is used to bind each other.
[0028]
On the surface of the uppermost resin foam block 4a, the insertion piece 53 is inserted into the block 4a so as to straddle the contact surfaces of the resin foam blocks adjacent to each other. It strikes and the attitude | position of the resin foam block 4a of both adjacent is stabilized. Thereafter, the reinforcing bars 5 for the concrete slab 6 are arranged using the concave grooves 57a formed at the upper ends of the “projections 56a functioning as spacers” of the respective binding tools 502, and the concrete is placed in that state. Thus, the concrete slab 6 is constructed. On the constructed concrete slab 6, a step of forming a road layer 10 by a roadbed 8, asphalt pavement 9, etc. is performed in the same manner as in the conventional method.
[0029]
As described above, the binding device 502 that is struck to stabilize the posture of the resin foam block 4a is formed on the substrate 52 in addition to the strength of the root portion being strong and stable driving. Since the protrusion 56a can be used as it is as a spacer when the reinforcing bar 5 for the concrete floor slab is disposed, the operation for making the concrete floor slab 6 is greatly simplified. Further, the binding tool 502 has a flat substrate 52 having a large plane area, which is located on the surface of the resin foam block 4a, so that the binding tool 502 is on the reinforcing bar 5 arranged by the operator or the binding tool 502. Even if it rides on, the binding tool 502 does not sink into the resin foam block 4a, and there is an advantage that the distance between the reinforcing bar 5 and the resin foam block 4a can be kept constant. Instead of the binding tool 502, the illustrated binding tool 501 can be used in the same manner. In addition, the binding tool of this form can be similarly used when constructing an intermediate concrete floor slab (not shown).
[0030]
【The invention's effect】
As described above, the binding tool used in the lightweight embankment method according to the present invention has a strengthened strength at the base portion of the insertion piece, that is, the connection portion between the insertion piece and the substrate, and against a lateral load acting on the insertion piece. High resistance and not easily deformed. Therefore, even if a load in an irregular direction is applied to the insertion piece or the vicinity thereof during the preparation operation or the driving operation, a bending portion or a bent portion is generated in the vicinity of the base portion as in the conventional fastening tool. There is nothing. Thereby, when a binding tool is driven into the resin foam block, it is possible to reliably avoid a gap between the flat substrate and the resin foam block surface. For that purpose, the initial design of the amount of settlement of the lightweight embankment layer that occurs when heavy objects such as concrete floor slabs and roadbeds are installed on the lightweight embankment layer in which resin foam blocks are stacked in multiple stages using binding tools. Therefore, the need to perform repair work on the roadbed is greatly reduced.
[0031]
When using the binding device of the second aspect, the work for stabilizing the uppermost resin foam block group and the work for arranging the reinforcing bar spacer when making the concrete floor slab can be performed simultaneously. Therefore, the work can be greatly simplified. Furthermore, since the tying tool does not sink inadvertently after the arrangement, it is possible to reliably ensure the covering of the reinforcing bars on the concrete floor slab.
[Brief description of the drawings]
FIG. 1 is a plan view showing an intermediate product of an example of a first form of a binding tool according to the present invention.
2 is a top perspective view showing a binding device manufactured from the intermediate product shown in FIG. 1. FIG.
FIG. 3 is a plan view showing an intermediate product of another example of the first form of the binding device according to the present invention.
4 is a perspective view showing a binding device manufactured from the intermediate product shown in FIG. 3 as seen from above. FIG.
FIG. 5 is a top perspective view showing still another example of the first form of the binding device according to the present invention.
FIG. 6 is a top perspective view showing an example of a second form of a binding tool according to the present invention.
FIG. 7 is a top perspective view showing another example of the second embodiment of the binding device according to the present invention.
FIG. 8 is a schematic cross-sectional view partially showing an example of a light-weight embankment structure constructed using the binding tool of the second embodiment according to the present invention.
FIG. 9 is a cross-sectional view showing an example of a structure by a lightweight embankment method.
FIG. 10 is a view showing an example of a binding tool used in a lightweight embankment method.
FIG. 11 is a diagram for explaining inconveniences when a conventional binding tool is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 4 ... Resin foam block, 4a ... Uppermost resin foam block, 5 ... Reinforcing bar for concrete floor slab, 6 ... Concrete floor slab, 50, 60, 70, 501, 502 ... Fastener according to the present invention, 50A , 60A: Intermediate product, 52: Flat substrate, 53: Insertion piece, 54, 65, 75 ... Insertion piece and substrate and connection part, 56, 56a ... Projection functioning as a spacer, 57 ... Concave part at the upper end of the projection

Claims (2)

A fastening tool used in a lightweight embankment method in which a plurality of insertion pieces to be inserted into a resin foam block, which is a lightweight embankment, is formed on one side or both sides of a flat substrate, and is a direction parallel to the substrate of the insertion piece The cross-sectional shape is a polygonal line shape at the connecting portion between the insertion piece and the substrate , and the polygonal line shape continues to the tip of the insertion piece . On one side of the flat board, a plurality of insertion pieces to be inserted into a resin foam block, which is a lightweight embankment, are formed, and on the other side, a function as a spacer is provided for the reinforcing bars for concrete floor slabs. It is a binding tool used in a lightweight embankment method in which a projection that fulfills the function is formed, and a recess for accommodating a reinforcing bar is formed at the upper end of the projection that serves as a spacer, and is parallel to the substrate of the insertion piece A binding tool for use in a lightweight embankment method, characterized in that a cross-sectional shape in any direction is a polygonal line shape at a connection portion between the insertion piece and the substrate , and the polygonal line shape continues to the tip of the insertion piece .

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