JP2006070518A - Geogrid reinforcing method - Google Patents

Geogrid reinforcing method Download PDF

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JP2006070518A
JP2006070518A JP2004253717A JP2004253717A JP2006070518A JP 2006070518 A JP2006070518 A JP 2006070518A JP 2004253717 A JP2004253717 A JP 2004253717A JP 2004253717 A JP2004253717 A JP 2004253717A JP 2006070518 A JP2006070518 A JP 2006070518A
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geogrid
embankment
reinforcing
wall surface
plate shape
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Itsuo Sakashita
五男 坂下
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Geosystem Co Ltd Japan
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Geosystem Co Ltd Japan
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the forward fall of a wall surface caused by curliness and sag of a geogrid and to provide easy and low-cost connection work to a wall surface material in a reinforced soil structure using a mesh-sheet like banking reinforcing geogrid. <P>SOLUTION: The banking reinforcing geogrid of roll shape is cut in predetermined length and spread in plate shape, and reinforcing pins are arranged one by one in an extending direction at both right and left ends in the width direction of the surface to bind the geogrid into plate shape, thus eliminating the curliness and sag of the geogrid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、コンクリートやブロックおよび鋼製枠などで形成された壁面を有する補強土構造物の、盛土を補強するため盛土内部に敷設される盛土補強用ジオグリッドの補強方法に関する。   The present invention relates to a method for reinforcing a geogrid reinforcement geogrid laid inside a embankment to reinforce an embankment of a reinforced earth structure having a wall surface formed of concrete, a block, a steel frame, or the like.

補強土構造物を構築するにあたり、盛土補強用ジオグリッドは図7に示すように鉛直方向に間隔をあけて壁面材と連結された状態で盛土内部に敷設される。従来の技術では、たとえばロール状で施工現場へ搬入された盛土補強用ジオグリッドを現場作業員が現場ヤードにおいて必要な長さに切りそろえてコンクリートパネルやブロックおよび鋼製枠の壁面材に連結して敷設するという手段が考えられた(例えば、特許文献1参照)。   When constructing the reinforced earth structure, the geogrid for embankment reinforcement is laid inside the embankment in a state of being connected to the wall surface material with a space in the vertical direction as shown in FIG. In the conventional technology, for example, a geogrid for embankment reinforcement brought into the construction site in roll form is cut to the required length in the site yard and connected to the wall material of concrete panels, blocks, and steel frames. The means of laying was considered (for example, refer patent document 1).

特開2004−19249号公報(第7頁、第1図)Japanese Unexamined Patent Publication No. 2004-19249 (page 7, FIG. 1)

特許文献1によると、盛土補強用ジオグリッドを壁面材と連結させたのち、巻きグセのあるジオグリッドを平板状にせしめ盛土の背面側へ緊張させた状態で固定ピンをジオグリッド背面最端部の横材に係止する状態で盛土層に打ち込み固定していた。   According to Patent Document 1, after connecting the geogrid for embankment reinforcement with the wall material, the geogrid with winding gussets is flattened, and the fixed pin is placed at the back end of the embankment, and the fixing pin is at the rearmost end of the geogrid. It was driven into the embankment layer and fixed in a state of being locked to the cross member.

解決しようとする問題点は、盛土補強用ジオグリッドを施工直前に所定の長さに切断し盛土内部に敷設、盛土背面側へ緊張させた状態で固定ピンを盛土層に打ち込み固定するような従来からの手段では、敷設した段階では巻きグセやたるみが残り、またこのような現象を解消するためにジオグリッドを背面側へ緊張させた状態で固定ピンをジオグリッド背面最端部の横材に係止するように盛土内に打ち込む方法を取ってはいるが、現実には人力で緊張し巻きグセやたるみを解消させることは困難であり、たとえば重機や機械を使用するにしてもジオグリッドと連結された壁面が動く恐れがある。すなわちジオグリッドを確実に緊張させることは困難であり、緊張されていないジオグリッドが盛土内部に敷設されている状況においては壁面に作用する土圧によりジオグリッドに引張力が作用し、巻きグセやたるみの部分が延伸され壁面が前方へ傾きひいては補強土構造物が崩壊に至ることも懸念される。また、現場における切断手間や巻きグセによる連結の手間に作業時間を要し、工事費のコストアップにつながっている。   The problem to be solved is that a geogrid for embankment reinforcement is cut to a predetermined length just before construction, laid inside the embankment, and fixed by driving a fixing pin into the embankment layer in a tensioned state on the back side of the embankment In the method of, the winding pinch and sagging remain at the stage of laying, and in order to eliminate such a phenomenon, the fixing pin is applied to the cross member at the back end of the geogrid with the geogrid tensioned to the back side. Although it takes a method of driving into the embankment so as to lock, in reality it is difficult to eliminate tension and sagging due to human power, even if you use heavy machinery and machinery, There is a risk that the connected walls will move. In other words, it is difficult to reliably tension the geogrid, and in a situation where an unstrained geogrid is laid inside the embankment, a tensile force acts on the geogrid due to earth pressure acting on the wall surface, There is also a concern that the sagging portion is stretched and the wall surface tilts forward and the reinforced earth structure collapses. In addition, it takes time to cut the work on the site and to connect by winding hoses, leading to an increase in construction costs.

そこで、このような不都合を解消すべく、本発明は、盛土補強用ジオグリッドを施工現場に搬入する以前に、ジオグリッドを所定の長さに切断して平板状に敷きならした状態でその表面の幅方向左右両端部に1本づつの補強ピンを延長方向に配置し結束して板状にせしめることを特徴とする。   Therefore, in order to eliminate such inconveniences, the present invention is designed in such a manner that the geogrid is cut into a predetermined length and laid flat before the embankment reinforcing geogrid is brought into the construction site. One reinforcing pin is arranged in the extending direction at both the left and right ends of the width direction, and is bound into a plate shape.

本発明によれば、盛土補強用ジオグリッド22を所定の長さに切断して平板状に敷きならした状態でその表面の幅方向左右両端部に1本づつの補強ピン31を延長方向に配置して番線32等で結束して板状にせしめることで巻きグセやたるみが解消され、この状態で施工現場に搬入し壁面材21と連結し盛土23内部に敷設することで、ジオグリッド22のたるみが解消し、たるみによる壁面の変形を抑止し安全で確実な補強土構造物11が構築されるとともに、施工現場における作業手間を省力化し工事費のコストダウンが図れる利点がある。   According to the present invention, the reinforcing grids 31 are arranged in the extending direction, one at each of the widthwise left and right ends of the surface of the embankment reinforcing geogrid 22 cut into a predetermined length and laid flat. Then, bundling and sagging are eliminated by bundling them with a wire 32 or the like to bring them into a plate shape, and in this state, they are brought into the construction site, connected to the wall surface material 21 and laid inside the embankment 23, so that the geogrid 22 The sagging is eliminated, the deformation of the wall surface due to sagging is suppressed, and a safe and reliable reinforced earth structure 11 is constructed. In addition, there is an advantage that labor can be saved at the construction site and construction costs can be reduced.

ロール状の盛土補強用ジオグリッド24を所定の長さに切断して平板状に敷きならしその表面の幅方向左右両端部に1本づつの補強ピン31を延長方向に配置し結束して板状にせしめ、ジオグリッド22の巻きグセやたるみを解消することに実現した。   The roll-shaped embankment reinforcing geogrid 24 is cut to a predetermined length and laid out in a flat plate shape, and one reinforcing pin 31 is arranged in the extending direction at the left and right ends of the surface in the extending direction and bound together. This was achieved by eliminating the tangling and sagging of the geogrid 22.

以下、本発明の実施例を図面に基づいて説明する。
図2はロール状の盛土補強用ジオグリッド24を示す斜視図である。
工場で製造された盛土補強用ジオグリッド22はロール24の状態で製品となる。幅は約1.0m、長さは各品番により違っており約30〜100mのものが直径約0.35〜0.4mのロール状に形成される。このようなロール形状は人力で小運搬が可能な重量、およそ30kg程度を目安として形状を決定している。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 is a perspective view showing a roll-shaped embankment reinforcing geogrid 24.
The embankment reinforcing geogrid 22 manufactured in the factory becomes a product in the state of the roll 24. The width is about 1.0 m, and the length varies depending on each product number. About 30 to 100 m is formed in a roll shape having a diameter of about 0.35 to 0.4 m. Such a roll shape is determined based on a weight that can be transported by human power, about 30 kg.


図3は盛土補強用ジオグリッドの22一部を示す平面図である。
盛土補強用ジオグリッド22は、一方向に延びる縦材41と縦材41とは異なる方向に延びる横材42により形成され、可撓性を有し、たとえばポリエチレンから成る。具体的には、ポリエチレンを用いて成型して板状の素材を形成し、この素材を厚み方向に挿通する挿通孔44をたとえばパンチングによって形成して格子状態を得り、このような格子状態を軟化点以上かつ融点未満の温度に加熱し、前記挿通孔44を広げるように一方向に引張り、格子の状態にジオグリッド22が形成される。さらにポリエチレンにカーボンを含有することによって紫外線の内方への浸透を防ぎ紫外線劣化を防止するようにしてもよい。

FIG. 3 is a plan view showing a portion 22 of the geogrid for embankment reinforcement.
The embankment reinforcing geogrid 22 is formed of a vertical member 41 extending in one direction and a cross member 42 extending in a different direction from the vertical member 41, has flexibility, and is made of, for example, polyethylene. Specifically, a plate-like material is formed by molding using polyethylene, and a lattice state is obtained by forming, for example, punching through holes 44 through which this material is inserted in the thickness direction. Heating to a temperature above the softening point and below the melting point, pulling in one direction to widen the insertion hole 44, the geogrid 22 is formed in a lattice state. Furthermore, by containing carbon in polyethylene, penetration of ultraviolet rays into the inside may be prevented and ultraviolet degradation may be prevented.

図4は盛土補強用ジオグリッド22の表面に補強ピン31を結束させた状態を示す平面図、図5は同じ状態を示す断面図である。
盛土補強用ジオグリッド22を所定の長さに切断して平板状に敷きならす。敷きならしたジオグリッド22の表面に幅方向の両側端部に1本づつ、長さ方向にジオグリッド22とほぼ同じ長さの補強ピン31を配置し番線32などで結束する。このとき補強ピン31に使用する材料は鉄筋、塩ビ管、鋼管、薄板など安価で軽量、適度な剛性を有するものであればよい。
FIG. 4 is a plan view showing a state in which reinforcing pins 31 are bundled on the surface of the geogrid 22 for embankment reinforcement, and FIG. 5 is a cross-sectional view showing the same state.
The embankment reinforcing geogrid 22 is cut into a predetermined length and laid out flat. Reinforcing pins 31 having the same length as the geogrid 22 are arranged on the surface of the geogrid 22 laid on the surface of the geogrid 22, one on each side end in the width direction, and tied together with a number 32. At this time, the material used for the reinforcing pin 31 may be any material such as a reinforcing bar, a polyvinyl chloride pipe, a steel pipe, or a thin plate that is inexpensive, lightweight, and has an appropriate rigidity.

補強ピン31をジオグリッド22に固定させる手段としては番線や結束線を用いるほかに、Cリンガーと呼ばれる大型ホッチキスを用いれば容易に結束することが可能である。   As a means for fixing the reinforcing pin 31 to the geogrid 22, in addition to using a number wire or a binding wire, it is possible to easily bind it by using a large stapler called a C ringer.

また、盛土補強用ジオグリッド22と補強ピン31を結束するにあたっては、ジオグリッド22を延長方向に緊張させておくことが望ましい。   Further, when the embankment reinforcing geogrid 22 and the reinforcing pin 31 are bound, it is desirable that the geogrid 22 is tensioned in the extending direction.

次に、短い幅の盛土補強用ジオグリッド22を用いた場合の補強方法を図面に基づいて説明する。
図6は短い幅の盛土補強用ジオグリッド22の表面に補強ピン31を結束させた状態を示す平面図である。
盛土補強用ジオグリッド22は1.0mを標準幅としているが、使用するケースや箇所などによって短い幅のジオグリッドを使用するケースが発生する。短い幅のジオグリッドに関しては図5に示すように補強ピン31を中央付近に1本配置して結束すれば十分である。
Next, a reinforcing method when the short-width embankment reinforcing geogrid 22 is used will be described with reference to the drawings.
FIG. 6 is a plan view showing a state in which the reinforcing pins 31 are bound to the surface of the short embankment reinforcing geogrid 22.
The embankment reinforcing geogrid 22 has a standard width of 1.0 m. However, there are cases where a short-width geogrid is used depending on the case and location used. For a short-width geogrid, it is sufficient to place and bind one reinforcing pin 31 near the center as shown in FIG.

図1は板状の盛土補強用ジオグリッド22を壁面材21に連結させた状態を示す斜視図である。

以上のようにして、板状に形成された盛土補強用ジオグリッド22を施工現場へ搬入し板状のまま壁面材21と連結させることで、施工現場でジオグリッド22に緊張を与えず、また固定ピンを使用せずともジオグリッド22は巻きグセやたるみが解消されており、これらの影響による壁面の変形を解消することができた。
FIG. 1 is a perspective view showing a state in which a plate-shaped embankment reinforcing geogrid 22 is connected to a wall material 21.

As described above, the embankment reinforcing geogrid 22 formed in a plate shape is brought into the construction site and connected to the wall surface material 21 in a plate shape, so that the geogrid 22 is not tensioned at the construction site, Even without using a fixing pin, the winding and sagging of the Geogrid 22 are eliminated, and the deformation of the wall surface due to these effects can be eliminated.

特に、壁面がコンクリートパネル構造の補強土構造体11では壁面の前倒れによる変形が顕著であることから、ジオグリッド22敷設時の巻きグセやたるみの解消は重要であり、本発明により問題とする課題を解決するものである。   In particular, in the reinforced soil structure 11 having a concrete wall structure, since the deformation due to the forward tilting of the wall surface is remarkable, it is important to eliminate winding sag and sagging when the geogrid 22 is laid, which is a problem according to the present invention. It solves the problem.

網シート状の盛土補強材ジオグリッド22を用いた補強土構造体11のジオグリッド敷設に関して、ロール状の盛土補強材ジオグリッド24を所定の長さに切断して平板状に敷きならし、その表面の幅方向左右両端部に1本づつの補強ピン31を延長方向に配置し結束して板状にせしめることでジオグリッド22の巻きグセやたるみを解消することに実現し、この状態で施工現場に搬入させ壁面材21と連結し盛土23内部に敷設することで、巻きグセやたるみによる壁面の変形を抑止し安全で確実な補強土構造物が構築されるとともに、施工現場における作業手間を省力化し工事費のコストダウンが可能となり低コストの補強土構造体を提供することができる。   Regarding the geogrid laying of the reinforced soil structure 11 using the net-like embankment reinforcing material geogrid 22, the roll-like embankment reinforcing material geogrid 24 is cut into a predetermined length and laid out in a flat plate shape. The reinforcing pins 31 are arranged in the extending direction at the left and right ends of the surface in the width direction and tied together to form a plate shape. By bringing it into the work site and connecting it with the wall surface material 21 and laying it inside the embankment 23, a deformation of the wall surface due to winding gaze and sagging is suppressed, and a safe and reliable reinforced earth structure is constructed. It is possible to save labor and reduce construction costs, and to provide a low-cost reinforced soil structure.

本発明の実施の一形態を示す斜視図である。It is a perspective view which shows one Embodiment of this invention. 本発明のロール状の盛土補強材ジオグリッドを示す斜視図である。It is a perspective view which shows the roll-shaped embankment reinforcement geogrid of this invention. 本発明の盛土補強用ジオグリッドの一部を示す平面図である。It is a top view which shows a part of the geogrid for embankment reinforcement of this invention. 本発明の実施の一形態を示す平面図である。It is a top view which shows one Embodiment of this invention. 本発明の実施の一形態を示す断面図である。It is sectional drawing which shows one Embodiment of this invention. 本発明の短い幅のジオグリッドを用いた場合の形態示す平面図である。It is a top view which shows the form at the time of using the short-width geogrid of this invention. 従来の盛土補強用ジオグリッドを用いた補強土構造体の全体図である。It is a general view of the reinforced soil structure using the conventional embankment for embankment reinforcement.

符号の説明Explanation of symbols

11 補強土構造体
21 壁面材
22 盛土補強用ジオグリッド
23 背面盛土
24 ロール状の盛土補強用ジオグリッド
31 補強ピン
32 番線
41 縦材
42 横材
43 連結金具
44 挿通孔
DESCRIPTION OF SYMBOLS 11 Reinforced soil structure 21 Wall material 22 Geogrid for embankment reinforcement 23 Back embankment 24 Rolled embankment geogrid 31 Reinforcement pin 32 No. 41 Vertical material 42 Horizontal material 43 Connecting metal fitting 44 Insertion hole

Claims (1)

盛土を補強するために盛土内に鉛直方向に間隔をあけて敷設する盛土補強用ジオグリッドであって、ロール状のジオグリッド補強材を所定の長さに切断して敷きならしその表面の幅方向左右両端に1本づつの補強ピンを延長方向に配置し結束して板状にせしめることを特徴とするジオグリッドの補強方法。   In order to reinforce the embankment, the embankment is a geogrid for embankment reinforcement that is laid in the embankment at intervals in the vertical direction. A reinforcing method of a geogrid, characterized in that one reinforcing pin is arranged in the extending direction at both left and right ends of the direction and bound to form a plate shape.
JP2004253717A 2004-09-01 2004-09-01 Geogrid reinforcing method Pending JP2006070518A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014091982A (en) * 2012-11-05 2014-05-19 Maeda Kosen Co Ltd Reinforcement material
CN107524159A (en) * 2017-01-19 2017-12-29 湖南大学 A kind of hybrid reinforced soil retaining wall

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014091982A (en) * 2012-11-05 2014-05-19 Maeda Kosen Co Ltd Reinforcement material
CN107524159A (en) * 2017-01-19 2017-12-29 湖南大学 A kind of hybrid reinforced soil retaining wall
CN107524159B (en) * 2017-01-19 2019-07-19 湖南大学 A kind of hybrid reinforced soil retaining wall

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