JPS60152702A - Unequal sinking preventing method of rear surface build-up soil of structure - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 この発明は、道路建設の分野において、特に橋台の背面
、あるいはボックスカルノ（−ト、マンホール等地中構
造物の上部に施工された盛土（盛土地盤）の不同（又は
局部、以下同じ。）沈下防止工法に係り、さらにいえば
、長い帯状の補強板をサンドイッチ状に盛土中に施工す
ることによる不同沈下防止工法に関する。DETAILED DESCRIPTION OF THE INVENTION This invention is particularly useful in the field of road construction, where unevenness (or The present invention relates to a construction method for preventing subsidence (local (hereinafter the same)), and more specifically to a method for preventing uneven subsidence by constructing long strip-shaped reinforcing plates in a sandwich-like manner in the embankment.

（従来技術） 道路建設における盛土の設計施工において困難なことは
、橋台、カルバートなど沈下の少ない構造物と盛土との
接続部の段差の問題である。(Prior Art) A difficult problem in the design and construction of embankments in road construction is the problem of differences in level between the embankment and structures with little subsidence, such as bridge abutments and culverts.

即ち、盛土を十分締固めても、剛な基礎をもった構造物
よシも盛土の沈下が多く、両者間に段差を生ずる。路面
に段差を生ずると、車両の通行上非常な障害となる。That is, even if the embankment is sufficiently compacted, the embankment will tend to settle more often than structures with rigid foundations, creating a level difference between the two. When a difference in level occurs on the road surface, it becomes a serious obstacle to the passage of vehicles.

そこで従来、上記障害を防ぐ対策としては、接続部の盛
土に特に精選した材料を用いて沈下量を減らすとか、基
礎地盤に高度の安定処理な施す、などの方法が実施され
た。Conventionally, measures to prevent the above-mentioned problems have been implemented, such as using specially selected materials for embankments at connection areas to reduce the amount of settlement, and applying highly stable treatments to the foundation ground.

その他に、例えば橋台施工の場合には、第１図に示した
とおり、橋台１の背面に施工した盛土２の表面に、沈下
が一定に落着くあたりＬまで踏掛板３，３を敷設すると
共に踏掛板３の下に摩擦杭４・・・を打ち込んで道路横
断面形の不同沈下、ガタつきを防止していた。図中５は
橋桁である。踏掛板３は、盛土２の沈下の進行にともな
い、その板厚を補正（交換）する。In addition, for example, in the case of abutment construction, as shown in Figure 1, stepping boards 3, 3 are laid on the surface of the embankment 2 constructed on the back of the abutment 1 up to L when the subsidence stabilizes. Friction piles 4 were driven under the stepping boards 3 to prevent uneven settlement and rattling of the cross section of the road. 5 in the figure is the bridge girder. The thickness of the stepping board 3 is corrected (replaced) as the embankment 2 continues to sink.

しかし、この方法の場合は、摩擦杭４の打ち込み、ある
いは踏掛板３の敷設に要する費用、工数が多くかかる欠
点があった。However, this method has the drawback that driving the friction piles 4 or laying the stepping boards 3 requires a large amount of cost and man-hours.

次に、ボックスカルバートを施工した場合は、第２図に
示したとおり、ボックスカルバート５が支持杭８，８で
支えられている（但し１．ボックスカルバートが硬い支
持地盤上に施工され支持杭の無い場合もある。）関係上
、ボックスカルバート６の直上部分の盛土７ａの沈下は
制限されるが、側方周辺部分の盛土７ｂは沈下するに任
せた状態となる。このため、道路横断面形は、第２図中
に点線で図示した如く、ボックスカルバート６が局部的
に浮き上がった状態（ガタついだ状態）となる欠点があ
った。Next, when a box culvert is constructed, as shown in Figure 2, the box culvert 5 is supported by the support piles 8, 8 (However, 1. The box culvert is constructed on a hard support ground and the support piles are (In some cases, there is no such thing.) For this reason, the sinking of the embankment 7a directly above the box culvert 6 is restricted, but the embankment 7b around the sides is allowed to sink. For this reason, the cross-sectional shape of the road has the disadvantage that the box culvert 6 is partially raised (shaky) as shown by the dotted line in FIG.

（発明の目的） そこで、この発明の目的は、盛土地盤における構造物背
面ないし構造物まわシの地盤の沈下を緩和し、地盤の沈
下、変形を略一定に落着かせ、あるいは局部的に浮き上
がった状態となる構造物に悪い影響を及ばずことを防止
できる構造物背面盛土の不同沈下防止工法を提供するこ
とにある。(Objective of the Invention) Therefore, the object of the present invention is to alleviate the ground subsidence of the back of the structure or around the structure in the embankment, to stabilize the subsidence and deformation of the ground to a substantially constant level, or to prevent the ground from rising locally. To provide a construction method for preventing uneven settlement of back embankment of a structure, which can prevent the uneven settlement of the back embankment of a structure without having a bad influence on the structure.

（発明の開示） 上記目的を達成するために、この発明の構造物背面盛土
の不同沈下防止工法は、構造物背面盛土の施工に際して
、一端を構造物に連結した帯状の補強板を、盛土中に所
定のピッチで略水平に、かつ、盛土のゆるみ範囲の外側
まで届く長さのものとして敷設し、盛土の締固めと補強
板の敷設とをくり返し、補強板をサンドイッチ状に盛土
中に施工する工程で構成されている。(Disclosure of the Invention) In order to achieve the above object, the method for preventing uneven settlement of the back embankment of a structure according to the present invention is such that when constructing the back embankment of a structure, a strip-shaped reinforcing plate connected to the structure at one end is inserted into the embankment. The reinforcement plates are laid approximately horizontally at a predetermined pitch and long enough to reach the outside of the loose area of the embankment, and the reinforcement plates are sandwiched into the embankment by repeating compaction of the embankment and laying of reinforcing plates. It consists of the following steps.

（作用効果） つまり、盛土中にサンドイッチ状に施工された補強板は
、いわば盛土の補強鉄筋のような働きをするのである。(Function and Effect) In other words, the reinforcing plates constructed in the form of a sandwich in the embankment act like reinforcing bars for the embankment.

即ち、土と補強板との間に働く摩擦によって補強板は常
に引張状態におかれ、盛土構造体に補強板の強度と配置
の密度に比例した見か妙の粘着力を付与し増大させ、構
造物とその背面盛土との一体化が達成される。In other words, the reinforcement plates are always kept in tension due to the friction acting between the soil and the reinforcement plates, giving and increasing the apparent adhesion force to the embankment structure that is proportional to the strength of the reinforcement plates and the density of their placement. Integration of the structure and its back embankment is achieved.

その結果背面盛土地盤の極端な沈下、変形が緩和、抑制
されるのである。As a result, extreme subsidence and deformation of the back embankment ground is alleviated and suppressed.

従って、踏掛板は１．０〜２．０ｍぐらいの小さいもの
とすることができ、コスト低減に寄与する。あるいは地
中構造物上部の路面が浮き上がった状態で残るというよ
うな悪影響を抑えることができる。Therefore, the stepping board can be made as small as about 1.0 to 2.0 m, contributing to cost reduction. Alternatively, it is possible to suppress negative effects such as the road surface above the underground structure remaining in a raised state.

その上、背面盛土の施工において、補強板が決められた
層ごとに水平に敷かれているため、必然的に盛土はその
層厚になるように水平に薄層転圧することになり、その
結果、極めて整然とした管理しやすい盛土施工ができる
のである。Furthermore, when constructing the back embankment, reinforcing plates are laid horizontally in predetermined layers, so the embankment inevitably has to be rolled horizontally into thin layers to achieve the specified layer thickness. This allows embankment construction to be carried out in an extremely orderly and easy-to-manage manner.

次に、第３図以下に示した実施例を説明する。Next, the embodiment shown in FIG. 3 and subsequent figures will be described.

（＃Ｅ１の実施例） 第３図と第４図において、１紘橋台、２は橋台背面の盛
土、３は盛土表面に敷設した踏掛板、５は橋桁、１０・
・・は盛土２中にサンドイッチ状に施工した長い帯状の
補強板である。(Example of #E1) In Figures 3 and 4, 1 is the abutment, 2 is the embankment on the back of the abutment, 3 is the stepping board laid on the surface of the embankment, 5 is the bridge girder, 10.
... is a long strip-shaped reinforcing plate constructed in the form of a sandwich in the embankment 2.

補強板１０としては、盛土２の沈下防止に必要な程度の
引張強度を有し、盛土２との摩擦抵抗が十分に大きく、
かつ、盛土２とのなじみの良いたわみ性と十分な耐久性
を有する材質、通常は市販の亜鉛メッキ平鉄板ないし平
鋼板が使用される。しかし、場合によってはプラスチッ
クシートないしフィルム（織布、不織布の別を問わず、
ネット状部材でもよい。）が使用される。補強板１０は
、亜鉛メッキの施されていない平鋼板の場合は耐用年数
を考えた錆代を含めた厚さのものとする。また、補強板
１００幅は５０寵〜１００　ｍｓぐらいで、橋台１から
盛土材のゆる＋範囲の外側所定範囲にまで届く長さのも
のとされている。必要により、補強材１０の表面に盛土
材との粘着力の増大を図るための粗面加工あるいは突起
物付与などの処理を施しておく。The reinforcing plate 10 has a tensile strength necessary to prevent the embankment 2 from sinking, has a sufficiently large frictional resistance with the embankment 2,
In addition, a material having good flexibility and sufficient durability that is compatible with the embankment 2, usually a commercially available galvanized flat iron plate or flat steel plate, is used. However, in some cases, plastic sheets or films (whether woven or non-woven)
A net-like member may also be used. ) is used. If the reinforcing plate 10 is a flat steel plate that is not galvanized, it should have a thickness that includes a rust allowance in consideration of its service life. Further, the width of the reinforcing plate 100 is approximately 50 mm to 100 ms, and is long enough to reach from the abutment 1 to a predetermined area outside the loose area of the embankment material. If necessary, the surface of the reinforcing material 10 is subjected to processing such as roughening or adding protrusions in order to increase the adhesion to the embankment material.

この補強板１０を施工する鉛直間隔は、橋台１背面の埋
戻し工に一般に使用されている締固め一層の仕上シ高さ
３０ｃｒｎ以下という基準よシ、６０ｃｍ以下に施工す
ることにより、基準値に盛土２を１層あるいは２層で締
固めることができる。また、補強板１０の第３図に見ら
れる水平方向の間隔離、橋台１の躯体施工時の型わく間
隔６０ｃｔ＊程度を基準として施工する。The vertical spacing at which the reinforcing plates 10 are constructed is 60 cm or less, which is the standard value of 30 crn or less for the single-layer compaction finish commonly used for backfilling the back of the abutment 1. The embankment 2 can be compacted in one layer or two layers. In addition, construction is carried out based on the horizontal spacing of the reinforcing plate 10 shown in FIG. 3, and the mold frame spacing of about 60 ct* when constructing the frame of the abutment 1.

補強板１０の施工要領としては、第５図のとおり、予め
橋台１の背面に補強板１０の施工ピッチにアングル等の
取付金具１１をホールインアンカー１２で取シ付は固定
（又は予め埋−込んでおいてもよい。）しておき、これ
に補強板１０の基端をボルト１３で連結し敷設する。As shown in Fig. 5, the installation procedure for the reinforcing plate 10 is to fix (or bury) the mounting brackets 11 such as angles on the back of the abutment 1 at the construction pitch of the reinforcing plate 10 with hole-in anchors 12 in advance. ), and then connect the base end of the reinforcing plate 10 to this with bolts 13 and lay it down.

この場合、補強板の敷設高さで盛土を締め固めた後、そ
の上に補強板１０を敷設し、その後ブルドーザ等によシ
補強板１０を傷めないように基準値に盛土をまき出し、
転圧締め固めを行なう。この作業をくり返して施工する
。In this case, after compacting the embankment at the laying height of the reinforcing plate, the reinforcing plate 10 is laid on top of it, and then the embankment is rolled out to the standard value so as not to damage the reinforcing plate 10 using a bulldozer or the like.
Perform rolling compaction. Repeat this process to build.

なお、盛土２の撒き出し敷き均し作業は橋台１の背面か
ら行ない、急激な方向転換等で補強板１０を傷つけるこ
とのないように施工する。The work of spreading and leveling the embankment 2 is carried out from the back side of the abutment 1, taking care not to damage the reinforcing plate 10 due to a sudden change in direction or the like.

橋台ｌの背面際の幅１．５ｍぐらいの範囲の締固めは人
力で行ない、空隙等を残さない様十分に施工する。Compaction of an area approximately 1.5 m wide at the back of the abutment l will be done manually, and the compaction will be done thoroughly so as not to leave any gaps.

かくして、盛土２の撒き出し敷き均し作業と補強板１０
の敷設作業とをくり返し、補強板１０をサンドイッチ状
に盛土２中に施工してゆく。In this way, the work of spreading and leveling the embankment 2 and the reinforcing plate 10
The reinforcing plate 10 is constructed in the embankment 2 in the form of a sandwich by repeating the laying operation.

従って、補強板１０と盛土２との間に働く摩擦によって
補強板１０は常時引張状態におかれ、″盛土２には補強
板１０の引張強度と配置の密度に比例した見かけの粘着
力を付与し増大せしめる。しかも橋台１と盛土２との一
体化によシ、盛土地盤の極端な沈下を抑えることができ
るので、ひいては踏掛板３を１．０ｍ〜２．０　ｍ程度
のごく小さいものとすることができ、コスト低減にも寄
与するのである。Therefore, the reinforcing plate 10 is always kept in tension due to the friction acting between the reinforcing plate 10 and the embankment 2, and the embankment 2 is given an apparent adhesive force proportional to the tensile strength of the reinforcing plate 10 and the arrangement density. Moreover, by integrating the abutment 1 and the embankment 2, it is possible to suppress the extreme settlement of the embankment ground, so the stepping board 3 can be made very small, about 1.0 m to 2.0 m. This also contributes to cost reduction.

また、補強板１０が決められた層ごとに水平に敷かれて
いるため、必然的に盛土２はその層厚になるように水平
に薄層転圧することとなる。Moreover, since the reinforcing plates 10 are laid horizontally in predetermined layers, the embankment 2 is necessarily rolled horizontally into thin layers so as to have the same layer thickness.

その結果、極めて整然とした管理し易い盛土施工を行な
えるのである。As a result, embankment construction can be carried out in an extremely orderly and easy-to-manage manner.

（第２の実施例） 第６図と第７図において、６はボックスカルバート、７
は盛土地盤、８は支持杭、１０・・・拡補強板である。(Second embodiment) In Figures 6 and 7, 6 is a box culvert, 7 is a
8 is the embankment ground, 8 is the support pile, and 10 is the expansion reinforcement plate.

この場合にも、補強板１０は、ボックスカルバート６０
両側に略対称な配置で、一端をボックスカルバート６に
連結し、盛土地盤７のゆるみ範囲の外側へ所定範囲まで
届く長さのものとして、かつ、埋戻し工に一般に実施さ
れている締固め一層の仕上シ高さ３０ａ＋＋以下とい）
基準の鉛直間隔で略水平に敷設し、補強板１０をサンド
イッチ状に盛土中に施工している。Also in this case, the reinforcing plate 10 is the box culvert 60
It has a substantially symmetrical arrangement on both sides, connects one end to the box culvert 6, and is long enough to reach a predetermined area outside the loosened area of the embankment ground 7, and is designed to be compacted evenly, which is generally carried out in backfilling work. (finish height 30a++ or less)
The reinforcing plates 10 are laid approximately horizontally at standard vertical intervals, and the reinforcing plates 10 are constructed in the form of a sandwich in the embankment.

従って、盛土地盤７に補強板１０の引張強度と配置の密
度に比例した見かけの粘着力を付与し増大せしめる。′
また、ボックスカルバート６と盛土地盤７との一体化に
より盛土地盤７の極端な沈下を抑え、即ち、第６図中に
点線で図示した如く一定範囲に落着いた沈下で車両の通
行に支障となる段差を生ずることは々いのである。Therefore, an apparent adhesive force proportional to the tensile strength and arrangement density of the reinforcing plate 10 is imparted to the embankment base 7 and increased. ′
In addition, the integration of the box culvert 6 and the embankment base 7 prevents extreme settling of the embankment base 7. In other words, as shown by the dotted line in Figure 6, the subsidence settles within a certain range and becomes a hindrance to vehicle traffic. There are many differences in level.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の橋台背面盛土の不同沈下防止工法の施工
図を示す断面図、第２図はボックスカルバートの施工断
面図、第３図はこの発明に係る橋台背面盛土の不同沈下
防止工法の施工図を示す水平断面図、第４図は同前の垂
直断面図、第５図は補強板と橋台との連結構造を示す断
面図、第６図はこの発明に係るボックスカルバートに係
る不同沈下防止工法の施工図の水平断面図、第７図は同
前の垂直断面図である。 発　明　者　新　藤　勝　士 発明者　渕　章　雄 発　明　者　高　野　尚　人 発　明　者　大　森　秀　高 山　願　人　株式会社　物中土木 １浄 代　理　人　弁理士　高　雄次ｎ、：　士、；、）−１
−Ｌ 第１図 第２図 第３図 第５図 第６図 第７図Fig. 1 is a cross-sectional view showing the construction drawing of the conventional method for preventing uneven settlement of the back embankment of an abutment, Fig. 2 is a cross-sectional view of the construction of a box culvert, and Fig. 3 is a construction diagram of the method of preventing uneven settlement of the back embankment of an abutment according to the present invention. Fig. 4 is a horizontal sectional view showing the construction drawing, Fig. 4 is a vertical sectional view of the same, Fig. 5 is a sectional view showing the connection structure between the reinforcing plate and the abutment, and Fig. 6 is the uneven settlement of the box culvert according to the present invention. A horizontal cross-sectional view of the construction drawing of the prevention construction method, and FIG. 7 is a vertical cross-sectional view of the same. Inventor Katsushi Shindo Inventor Akira Fuchi Inventor Takashi Takano Inventor Hide Omori Ganto Takayama Mononaka Doboku 1st Agent Patent attorney Yuji Taka -1
-L Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7

Claims (1)

【特許請求の範囲】[Claims] （１）構造物背面盛土の施工に際し、一端を構造物に連
結した帯状の補強板を、盛土中に所定４のピッチで略水
平に、かつ、盛土のゆるみ範囲の外側へ届く長さのもの
として敷設し、盛土の締固めと補強板の敷設とをくシ返
して補強板をサンドイッチ状に盛土中に施工しているこ
とを特徴とする構造物背面盛土の不同沈下防止工法。(1) When constructing an embankment on the back of a structure, place a strip-shaped reinforcing plate connected to the structure at one end approximately horizontally in the embankment at a predetermined pitch of 4, and with a length that reaches outside the slack range of the embankment. A construction method for preventing uneven settlement of the back embankment of a structure, characterized in that the reinforcement plates are constructed in the embankment in the form of a sandwich by reversing the compaction of the embankment and the laying of the reinforcing plates.