JP3373488B2 - Road construction - Google Patents

Road construction

Info

Publication number
JP3373488B2
JP3373488B2 JP2000248315A JP2000248315A JP3373488B2 JP 3373488 B2 JP3373488 B2 JP 3373488B2 JP 2000248315 A JP2000248315 A JP 2000248315A JP 2000248315 A JP2000248315 A JP 2000248315A JP 3373488 B2 JP3373488 B2 JP 3373488B2
Authority
JP
Japan
Prior art keywords
road
soil cement
soil
columnar
constructed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP2000248315A
Other languages
Japanese (ja)
Other versions
JP2001073305A (en
Inventor
哲彦 三浦
和之 藤川
章 浜武
英樹 田中
厚生 福田
茂 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Tenox Corp
Tenox Kyusyu Corp
Original Assignee
Mitsubishi Materials Corp
Tenox Corp
Tenox Kyusyu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp, Tenox Corp, Tenox Kyusyu Corp filed Critical Mitsubishi Materials Corp
Priority to JP2000248315A priority Critical patent/JP3373488B2/en
Publication of JP2001073305A publication Critical patent/JP2001073305A/en
Application granted granted Critical
Publication of JP3373488B2 publication Critical patent/JP3373488B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、軟弱地盤上に盛土
により構築された道路構築体に関する。
TECHNICAL FIELD The present invention relates to a road structure constructed by embankment on soft ground.

【0002】[0002]

【従来の技術】埋土層や沖積層の層厚が厚い軟弱地盤上
に盛土により道路構築体を構築する場合は、図4に示す
ように浅層地盤改良を施して剛性を高めた改良地盤を路
床とし、その上に盛土により各種砕石などからなる路盤
を設け、その上を舗装した道路構築体が一般的である。
(本明細書では、路盤と舗装とを分離せず、両者を合わ
せて道路舗装という。)そして、時には改良地盤の下層
に更に摩擦杭を設けて圧密による沈下を抑制している。
2. Description of the Related Art When constructing a road structure by embankment on soft ground with a large thickness of buried soil or alluvium, improved ground with improved rigidity by shallow ground improvement as shown in FIG. Is generally used as a roadbed on which a roadbed made of various crushed stones is provided by embankment and the road structure is paved on it.
(In the present specification, the roadbed and the pavement are not separated, but the two are collectively referred to as road pavement.) At times, friction piles are further provided in the lower layer of the improved ground to suppress settlement due to consolidation.

【0003】[0003]

【発明が解決しようとする課題】道路構築体の路床には
盛土による静的荷重とともに交通による動的荷重が負荷
され、これらが合成されて路床に伝達される。そのた
め、改良の程度が十分でない場合には静的荷重による圧
密沈下には十分耐えられても、その数倍の動的荷重には
耐えられず、道路構築体が動的荷重により圧密沈下し続
けることとなる。一方、地盤を十分に改良すれば、動的
荷重による圧密沈下を抑制することは勿論可能である
が、地盤改良の程度と動的荷重による圧密沈下の抑制効
果との関連が十分に把握されていないため、圧密沈下を
抑制しようとするあまり、過剰に地盤改良をして無用な
工期の長さ、無駄な工費の支出を招くことが多かった。
The roadbed of the road structure is subjected to a static load due to embankment and a dynamic load due to traffic, which are combined and transmitted to the roadbed. Therefore, if the degree of improvement is not sufficient, even if it can withstand consolidation settlement due to static load, it will not be able to withstand several times that dynamic load, and road construction will continue to undergo consolidation settlement due to dynamic load. It will be. On the other hand, if the ground is sufficiently improved, it is of course possible to suppress consolidation settlement due to dynamic load, but the relationship between the degree of ground improvement and the effect of suppressing consolidation settlement due to dynamic load is well understood. Since there is no such thing, it is often attempted to suppress consolidation settlement, resulting in excessive ground improvement resulting in unnecessary construction period and unnecessary construction cost.

【0004】[0004]

【課題を解決するための手段】本発明は、その上に構築
される道路構築体の動的荷重による圧密沈下を実質的に
なくするための効率的な地盤改良について検討した結果
なされた発明である。
SUMMARY OF THE INVENTION The present invention has been made as a result of a study on efficient ground improvement for substantially eliminating consolidation settlement of a road structure constructed thereon due to a dynamic load. is there.

【0005】即ち、本発明は、道路基礎の軟弱地盤に、
平面配置を格子状配置または非接触形千鳥配置として平
面視改良率20〜60%で構築されたソイルセメント柱
状体と、その上に敷設された固結材を混合して固結した
改良土壌と、上部に構築された道路舗装からなり、ソイ
ルセメント柱状体の先端から道路舗装面までの高さが4
m以上であることを特徴とする道路構築体である。そし
て、平面配置が格子状配置の場合は格子間隔がソイルセ
メント柱状体の上端から道路舗装面までの高さの2倍以
下に設定され、平面配置が非接触形千鳥配置の場合は隣
接する2本のソイルセメント柱状体の間隔がソイルセメ
ント柱状体の上端から道路舗装面までの高さの2倍以下
に設定されている。
That is, the present invention is applied to soft ground of a road foundation,
A soil cement columnar body constructed with a lattice arrangement or a non-contact staggered arrangement in a plane view improvement rate of 20 to 60%, and an improved soil obtained by mixing and consolidating a solidifying material laid thereon. , Consisting of road pavement built on the top, the height from the tip of the soil cement pillar to the road pavement surface is 4
It is a road structure characterized by being m or more. If the planar arrangement is a grid-like arrangement, the lattice spacing is set to not more than twice the height from the upper end of the soil cement pillar to the road pavement surface, and if the planar arrangement is a non-contact staggered arrangement, two adjacent The distance between the soil cement pillars of the book is set to be twice the height from the upper end of the soil cement pillars to the road paving surface.

【0006】深層地盤の改良にソイルセメント柱状体の
形成、浅層地盤の改良に固結材で固結した改良土壌の敷
設という組み合わせを採用する際には、ソイルセメント
柱状体の長さ+浅層改良土壌(路床)の厚さ+道路舗装
の厚さ、が動的荷重による圧密沈下抑制のための大きな
条件であり、この値が4m以上となると動的荷重による
圧密沈下を実質的になくすることができる。更に、ソイ
ルセメント柱状体は平面視改良率20〜60%の範囲で
形成すれば十分であり、改良率を殊更高める必要はな
い。
[0006] When the combination of forming soil cement pillars for the improvement of deep ground and laying the improved soil solidified with a solidifying material for improving the shallow ground is adopted, the length of the soil cement pillar + the shallow The thickness of the layer-improved soil (roadbed) + the thickness of road pavement is a large condition for suppressing consolidation settlement due to dynamic load, and when this value is 4 m or more, consolidation settlement due to dynamic load is substantially It can be lost. Further, it is sufficient to form the soil cement columnar body in the range of improvement rate of 20 to 60% in plan view, and it is not necessary to further increase the improvement rate.

【0007】本発明においては上記のソイルセメント柱
状体の長さ+浅層改良土壌(路床)の厚さ+道路舗装の
厚さ、の値は4m以上である必要はあるが、大きくして
もさほど動的圧密沈下の抑制効果は大きくならない。し
かし、大きくなればそれだけ静的圧密沈下の抑制効果は
大きくなる。通常、ソイルセメント柱状体の長さは3〜
5mに、浅層改良土壌の厚さは0.5〜1mに、道路舗
装の厚さは10〜50cmに設定され、ソイルセメント
柱状体の先端から道路舗装面までの高さが4〜7mに設
定される。
In the present invention, the value of the length of the soil cement columnar body + the thickness of the shallow layer improved soil (roadbed) + the thickness of the road pavement is required to be 4 m or more, but it should be increased. The effect of suppressing dynamic consolidation settlement is not so great. However, the larger the effect, the greater the effect of suppressing static consolidation settlement. Normally, the length of soil cement column is 3 ~
5 m, the thickness of the shallow layer improved soil is set to 0.5 to 1 m, the thickness of the road pavement is set to 10 to 50 cm, and the height from the tip of the soil cement columnar body to the road pavement surface is set to 4 to 7 m. Is set.

【0008】本発明で深層地盤改良のために構築される
ソイルセメント柱状体は動的荷重による地盤の側方流動
を防止することも目的としているが、平面配置を格子状
配置もしくは非接触形千鳥配置として、平面視改良率を
できるだけ低く抑える。平面視改良率20〜60%の範
囲においては格子状配置を採用した場合、格子間隔がソ
イルセメント柱状体の上端から道路舗装面までの高さの
2倍以下であれば、静的荷重、動的荷重はソイルセメン
ト柱状体の確実に伝達され、十分地盤の側方流動を防止
することが可能である。
The soil cement columnar body constructed for improving the deep ground in the present invention is also intended to prevent lateral flow of the ground due to a dynamic load, but the plane arrangement is a lattice arrangement or a non-contact staggered arrangement. As a layout, the improvement rate in plan view is kept as low as possible. When the grid-like arrangement is adopted in the range of 20 to 60% in plan view improvement, if the grid interval is less than twice the height from the upper end of the soil cement columnar to the road pavement surface, static load and dynamic The static load is reliably transmitted to the soil cement columnar body, and it is possible to prevent lateral flow of the ground sufficiently.

【0009】非接触形千鳥配置を採用した場合も同様に
道路軸方向およびそれに直交する方向に隣接する2本の
ソイルセメント柱状体の間隔がソイルセメント柱状体の
上端から道路舗装面までの高さの2倍以下であれば、静
的荷重、動的荷重はソイルセメント柱状体の確実に伝達
され、十分地盤の側方流動を防止することが可能であ
る。
Also in the case where the non-contact staggered arrangement is adopted, the distance between two soil cement columns adjacent to each other in the axial direction of the road and the direction orthogonal thereto is also the height from the upper end of the soil cement columns to the pavement surface of the road. 2 times or less, the static load and the dynamic load are reliably transmitted to the soil cement columnar body, and it is possible to sufficiently prevent the lateral flow of the ground.

【0010】以上は、道路を構築する基礎地盤中に埋設
構造物がない場合であるが、道路の構築に際しては、暗
渠などの既設地下構造物の上を横断する場合や道路の構
築に先行して暗渠などの既設地下構造物を敷設し、その
後、その上を横断して道路を構築する場合が多い。そし
て、この地下構造物は通常は支持層に到達する支持杭に
よって支持されており、沈下することはなく、沈下して
もごく少ない。この殆ど沈下しない地下構造物の上を横
断して構築した道路に動的荷重による圧密沈下が発生す
ると、地下構造物の上の部分とそれに隣接する部分とで
道路上に段差を生ずることとなり、交通上危険である。
The above is the case where there is no buried structure in the foundation ground for constructing the road, but when constructing the road, it is necessary to cross over existing underground structures such as underdrain or precede the construction of the road. In many cases, existing underground structures such as underdrains are laid and then roads are constructed by crossing over them. And this underground structure is normally supported by the support piles that reach the support layer, and it does not sink, and even if it sinks, it is very small. When consolidation subsidence due to a dynamic load occurs on a road constructed across an underground structure that hardly subsides, a step will occur on the road between the upper part of the underground structure and the part adjacent to it. It is a traffic hazard.

【0011】本発明はかかる段差の発生の解消にも利用
される。即ち、地下構造物の近傍にはソイルセメント柱
状体の先端から路盤舗装面までの高さを4m以上とした
長いソイルセメント柱状体が構築され、この地下構造物
から離れるに従って段々に短いソイルセメント柱状体が
構築されることによって、地下構造物の近傍では圧密沈
下が極力抑制され、離れるに従って徐々にある程度の圧
密沈下が許容されるという対策を採る。この場合でも、
段差解消工法は効率的で経済的である必要があるので、
地下構造物近傍の地盤改良の諸条件、即ち、構築される
ソイルセメント柱状体の平面配置、格子状配置の場合の
格子間隔、非接触形千鳥配置の場合の隣接するソイルセ
メント柱状体の間隔、平面視改良率、浅層改良土壌の配
合条件などは上記の道路全長にわたって改良する場合と
同じ条件が適用され、ただ、地下構造物から離れるに従
って段々ソイルセメント柱状体の長さが短くなる点が異
なる。
The present invention is also used to eliminate the occurrence of such a step. That is, in the vicinity of the underground structure, a long soil cement columnar body having a height from the tip of the soil cement columnar body to the roadbed pavement surface of 4 m or more is constructed, and the soil cement columnar column is gradually shortened as the distance from the underground structure is increased. By constructing the body, the settlement will be suppressed as much as possible in the vicinity of the underground structure, and a certain degree of consolidation settlement will be allowed as the distance increases. Even in this case,
Since the step difference elimination method needs to be efficient and economical,
Various conditions for ground improvement near the underground structure, namely, the plane arrangement of the soil cement columns to be constructed, the lattice spacing in the case of a lattice arrangement, the spacing of the adjacent soil cement columns in the case of non-contact staggered arrangement, The same conditions as in the case of improvement over the entire length of the road described above are applied to the plan view improvement rate, the mixing condition of the shallow layer improved soil, etc. However, the point that the length of the soil cement columnar becomes gradually shorter as it goes away from the underground structure. different.

【0012】[0012]

【発明の実施の形態】以下、図面を参照しながら、本発
明を詳細に説明する。図1は本発明の道路構築体の断面
図であり、(a)は一般部の道路軸に直交する方向の断
面図、(b)は地下構造物横断部の道路軸方向の断面図
である。図2は本発明および従来の道路構築体の圧密沈
下量と時間との関係を示すグラフである。図3はソイル
セメント柱状体の平面配置の例を示し、(a)は格子状
配置の1例、(b)は非接触形千鳥配置の1例である。
図4は若干異なった2つの従来の道路構築体の道路軸に
直交する方向の断面図である。
DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of a road structure of the present invention, (a) is a sectional view in a direction orthogonal to a road axis of a general part, and (b) is a sectional view in a road axis direction of an underground structure crossing part. . FIG. 2 is a graph showing the relationship between the consolidation settlement amount and time of the road construction of the present invention and the conventional road construction. FIG. 3 shows an example of a plane arrangement of soil cement columnar bodies, (a) is an example of a grid-like arrangement, and (b) is an example of a non-contact staggered arrangement.
FIG. 4 is a cross-sectional view of two slightly different conventional road constructions in a direction orthogonal to the road axis.

【0013】図1(a)を参照して、施工手順を交えな
がら、本発明の一般部の道路構築体の例を説明する。
With reference to FIG. 1 (a), an example of the road construction of the general part of the present invention will be described, together with the construction procedure.

【0014】(1)対象軟弱地盤を若干掘削し、通常の
ソイルセメント柱工法で径80cmのソイルセメント柱
状体1を、非接触形千鳥配置で、ピッチ200cm(道
路軸方向、直交方向とも)で平面視改良率25%で構築
する。ソイルセメント柱状体1の長さは350cmとす
る。ソイルセメント柱状体を構築するが、その長さが短
い場合として、工区によりソイルセメント柱状体1の長
さを200cmとする。
(1) The target soft ground is slightly excavated, and the soil cement columnar body 1 having a diameter of 80 cm is arranged in a non-contact staggered manner at a pitch of 200 cm (both in the axial direction of the road and in the orthogonal direction) by an ordinary soil cement pillar construction method. Constructed with a planar view improvement rate of 25%. The soil cement columnar body 1 has a length of 350 cm. Although the soil cement columnar body is constructed, if the length is short, the length of the soil cement columnar body 1 is set to 200 cm depending on the construction section.

【0015】(2)掘削土および他所より搬送してきた
土砂にセメント系固結材を混合した浅層改良土壌層11
を70cmの厚さに敷設する。
(2) Shallow layer improved soil layer 11 in which cement-based cement is mixed with excavated soil and earth and sand transported from another place
Is laid to a thickness of 70 cm.

【0016】(3)粒度調整砕石層15を10cmの厚
さに敷設し、その上を5cmの厚さのアスファルトーコ
ンクリート16で舗装する。
(3) The particle size adjusting crushed stone layer 15 is laid to a thickness of 10 cm, and the asphalt concrete 16 having a thickness of 5 cm is laid on it.

【0017】以上で本発明による一般部道路の構築は完
了し、ソイルセメント柱状体の先端から道路舗装面まで
の高さが435cmの道路構築体が構築される。ソイル
セメント柱状体を構築しても、その長さが短い200c
mの場合はソイルセメント柱状体の先端から道路舗装面
までの高さが285cmとなる。
As described above, the construction of the general road according to the present invention is completed, and the road construction in which the height from the tip of the soil cement columnar body to the road pavement surface is 435 cm is constructed. Even if a soil cement columnar body is constructed, its length is short, 200c
In the case of m, the height from the tip of the soil cement columnar body to the road pavement surface is 285 cm.

【0018】図1(b)の地下構造物横断部の場合に
は、上記(1)のソイルセメント柱状体1の長さを35
0cmから200cmまで数段階で段階的に減らす点以
外は上記と同様に施工する。
In the case of the underground structure crossing portion shown in FIG. 1 (b), the length of the soil cement columnar body 1 in (1) above is set to 35.
The construction is performed in the same manner as described above except that it is gradually reduced from 0 cm to 200 cm in several steps.

【0019】図2は各種の道路構築体の経過時間と沈下
量の関係を表す時間沈下曲線であり、l−本発明の場
合、m−ソイルセメント柱状体は構築されるがソイルセ
メント柱状体の先端から道路舗装面までの高さが285
cmの場合、n−図4(b)で示す従来の道路構築体の
場合、を示す。
FIG. 2 is a time settlement curve showing the relationship between the elapsed time and the amount of settlement of various road constructions. In the case of 1-the present invention, m-soil cement columnar bodies are constructed, but those of soil cement columnar bodies. The height from the tip to the road pavement surface is 285
In the case of cm, n-in the case of the conventional road construction shown in FIG.

【0020】グラフから明らかなように、供用開始まで
の静的荷重による沈下量はいずれも小さく有意差は認め
られない程度であるが、供用開始後の動的荷重による沈
下量は大きな差を生じ、本発明の道路構築体の動的荷重
による圧密沈下抑制の効果が大きいことがわかる。因み
に、ソイルセメント柱状体が構築されても、その長さが
短い場合は、従来の浅層地盤を十分に改良した場合と動
的荷重による圧密沈下抑制効果に大差がないことがわか
る。
As is clear from the graph, the settling amount due to the static load until the start of service is small and no significant difference is recognized, but the settlement amount due to the dynamic load after the start of service has a large difference. It is understood that the effect of suppressing the consolidation settlement by the dynamic load of the road structure of the present invention is great. By the way, even if the soil cement columnar body is constructed, if the length is short, there is no great difference in the consolidation settlement suppression effect by the dynamic load as compared with the case where the conventional shallow ground is sufficiently improved.

【0021】図3はソイルセメント柱状体の平面配置に
関連して格子状配置の場合の格子間隔および非接触形千
鳥配置を採用した場合の隣接する2本のソイルセメント
柱状体の間隔を説明するもので、(a)に示すように格
子間隔は格子が長方形の場合は長い方の間隔dが格子間
隔である。また、(b)に示すように隣接する2本のソ
イルセメント柱状体の間隔は、非接触形千鳥配置のピッ
チが道路軸方向とそれと直交方向とで異なる場合は長い
方の間隔d′が柱状体間隔である。
FIG. 3 illustrates the grid spacing in the case of the grid-like arrangement and the space between two adjacent soil cement pillars in the case of adopting the non-contact staggered arrangement in relation to the plane arrangement of the soil-cement pillars. As shown in (a), when the lattice is rectangular, the longer lattice spacing is the lattice spacing. Further, as shown in (b), the distance between two adjacent soil cement columnar bodies is such that when the pitch of the non-contact staggered arrangement is different between the road axial direction and the direction orthogonal thereto, the longer distance d'is columnar. It is a body interval.

【0022】[0022]

【発明の効果】本発明は深層地盤の改良にソイルセメン
ト柱状体の形成、浅層地盤の改良に固結材で固結した改
良土壌の敷設という組み合わせを採用し、かつ、平面配
置を格子状配置または非接触形千鳥配置としてソイルセ
メント柱状体の格子間隔または隣接するソイルセメント
柱状体の間隔をソイルセメント柱状体の上端から道路舗
装面の2倍以下として平面視改良率20〜60%でソイ
ルセメント柱状体が構築され、さらに、浅層改良土壌
(路床)の厚さ+道路舗装の厚さ、の値が4m以上とさ
れることにより、深層地盤の改良面積が少ないのにもか
かわらず、動的荷重による圧密沈下の抑制が可能とな
る。この結果、低工費で効率的な構築が可能な道路構築
体となる。
INDUSTRIAL APPLICABILITY The present invention employs a combination of formation of soil cement columnar bodies for improvement of deep ground and laying of improved soil solidified with a solidifying material for improvement of shallow ground, and the plane arrangement is grid-like. As a non-contact or staggered arrangement, the grid spacing of soil cement pillars or the spacing between adjacent soil cement pillars is not more than twice the road pavement surface from the top of the soil cement pillars. Despite the fact that the cement pillars are constructed and the value of the thickness of the shallow layer improved soil (roadbed) + the thickness of the road pavement is 4 m or more, the improvement area of the deep ground is small. It is possible to suppress consolidation settlement due to dynamic load. As a result, the road structure can be constructed efficiently with low construction cost.

【0023】また、殆ど沈下しない既設地下構造物上を
横断して構築された道路構築体の場合、道路基礎の軟弱
地盤に埋設されている地下構造物の近傍にはソイルセメ
ント柱状体の先端から路盤舗装面までの高さを4m以上
とした長いソイルセメント柱状体が構築され、この地下
構造物から離れるに従って段々に短いソイルセメント柱
状体が構築されているという構造を採用し、かつ、該ソ
イルセメント柱状体の平面配置は格子状配置または非接
触形千鳥配置とし格子間隔または隣接する2本のソイル
セメント柱状体の間隔をソイルセメント柱状体の上端か
ら道路舗装面までの高さの2倍以下として平面視改良率
20〜60%とされ、その上に敷設された改良土壌は固
結材を混合して固結したものであり、さらに、その上に
道路舗装が構築されていることにより、沈下しない既設
地下構造物上を横断する道路構築体に発生していた段差
の発生を防止することが可能になる。
In addition, in the case of a road structure constructed by crossing over an existing underground structure that hardly sinks, near the underground structure buried in the soft ground of the road foundation, from the tip of the soil cement columnar body. A structure is adopted in which a long soil cement columnar body having a height to the roadbed pavement surface of 4 m or more is constructed, and a shorter soil cement columnar body is constructed gradually with increasing distance from the underground structure, and the soil is used. Planar arrangement of cement pillars shall be a grid arrangement or non-contact staggered arrangement, and the lattice spacing or the interval between two adjacent soil cement pillars should be less than twice the height from the top of soil cement pillars to the road paved surface. The improvement rate is 20 to 60% in plan view, and the improved soil laid on it is solidified by mixing the solidifying material, and the road pavement is constructed on it. By that, it is possible to prevent the generation of steps that occurred on the road construct to traverse the existing underground structure Butsujo not sink.

【0024】即ち、既設地下構造物の近傍では圧密沈下
を極力抑制し、離れるに従って徐々にある程度の圧密沈
下を許容する。この結果、低工費で効率的な構築が可能
な道路構築体となる。
That is, the consolidation settlement is suppressed as much as possible in the vicinity of the existing underground structure, and a certain degree of consolidation settlement is gradually allowed as it goes away. As a result, the road structure can be constructed efficiently with low construction cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の道路構築体の断面図であり、(a)は
一般部の道路軸に直交する方向の断面図、(b)は地下
構造物横断部の道路軸方向の断面図である。
FIG. 1 is a cross-sectional view of a road structure of the present invention, in which (a) is a cross-sectional view in a direction orthogonal to a road axis of a general part, and (b) is a cross-sectional view in a road axis direction of an underground structure crossing part. is there.

【図2】本発明および従来の道路構築体の圧密沈下量と
時間との関係を示すグラフである。
FIG. 2 is a graph showing the relationship between consolidation settlement amount and time of the road construction of the present invention and the conventional road construction.

【図3】ソイルセメント柱状体の平面配置の例を示し、
(a)は格子状配置の1例、(b)は非接触形千鳥配置
の1例である。
FIG. 3 shows an example of a plane arrangement of a soil cement columnar body,
(A) is an example of a grid-like arrangement, and (b) is an example of a non-contact staggered arrangement.

【図4】若干異なった2つの従来の道路構築体の道路軸
に直交する方向の断面図である。
FIG. 4 is a cross-sectional view of two slightly different conventional road constructions in a direction orthogonal to the road axis.

【符号の説明】[Explanation of symbols]

1・・ソイルセメント柱状体、2・・支持杭、3・・暗
渠、11・・セメント系固結材乾式混合浅層改良土壌
層、12・・生石灰乾式混合浅層改良土壌層、13・・
Fe石灰乾式混合浅層改良土壌層、14・・クラッシャ
ーラン層、15・・粒度調整砕石層、16・・アスファ
ルトーコンクリート層。
1 ・ ・ Soil cement pillars, 2 ・ ・ Support piles, 3 ・ ・ Dark, 11 ・ ・ Cement-based cement dry mixed shallow layer improved soil layer, 12 ・ ・ Quick lime dry mixed shallow layer improved soil layer, 13 ・ ・
Fe-lime dry mixed shallow layer improved soil layer, 14 ・ ・ Crusher run layer, 15 ・ ・ Grade size controlled crushed stone layer, 16 ・ ・ Asphalt concrete layer.

───────────────────────────────────────────────────── フロントページの続き (73)特許権者 591072949 東京鋪装工業株式会社 東京都千代田区外神田2丁目4番4号 (72)発明者 三浦 哲彦 佐賀県佐賀市本庄町大字末次850−4 (72)発明者 藤川 和之 福岡県北九州市八幡西区永犬丸南町1− 7−5 (72)発明者 浜武 章 福岡県春日市弥生1丁目82番地 サンア イシティライフ春日3−311号 (72)発明者 田中 英樹 福岡県大牟田市甘木380−2 (72)発明者 福田 厚生 東京都港区赤坂6丁目13番7号 株式会 社テノックス内 (72)発明者 吉田 茂 東京都港区赤坂6丁目13番7号 株式会 社テノックス内 (56)参考文献 特開 平5−287723(JP,A) 特開 平7−305337(JP,A) 特開 平9−217336(JP,A) 特開 平7−109732(JP,A) 特開 平8−151629(JP,A) 特開 平6−306847(JP,A) 特開 平5−59717(JP,A) (58)調査した分野(Int.Cl.7,DB名) E01C 3/04 E02D 3/12 102 ─────────────────────────────────────────────────── ─── Continuation of front page (73) Patent holder 591072949 Tokyo Fuso Kogyo Co., Ltd. 2-4-4 Sotokanda, Chiyoda-ku, Tokyo (72) Inventor Tetsuhiko Miura 850-4 Suetsugu, Honjo-cho, Saga-shi, Saga ( 72) Inventor Kazuyuki Fujikawa 1-7-5 Nagainumaranami-cho, Hachimansai-ku, Kitakyushu, Fukuoka Prefecture (72) Inventor Takeaki Hama 1-82 Yayoi, Kasuga-shi, Fukuoka Sunai City Life 3-311 Kasuga (72) Invention Person Hideki Tanaka 380-2 Amagi, Omuta City, Fukuoka Prefecture 72-72 Inventor Kosei Fukuda 6-13-7 Akasaka, Minato-ku, Tokyo Tenox, Inc. (72) Inventor Shigeru Yoshida 6-13 Akasaka, Minato-ku, Tokyo No. 7 Within Tennox Co., Ltd. (56) Reference JP-A-5-287723 (JP, A) JP-A-7-305337 (JP, A) JP-A-9-217336 (JP, A) JP-A-7 109732 (JP, A) JP flat 8-151629 (JP, A) JP flat 6-306847 (JP, A) JP flat 5-59717 (JP, A) (58) investigated the field (Int.Cl. 7 , DB name) E01C 3/04 E02D 3/12 102

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 道路基礎の軟弱地盤に構築されたソイル
セメント柱状体と、その上に敷設された浅層改良土壌
と、上部に構築された道路舗装とからなる道路構築体で
あって、該ソイルセメント柱状体は平面配置が格子状配
置とされたものであり、その格子間隔はソイルセメント
柱状体の上端から道路舗装面までの高さの2倍以下であ
り、平面視改良率が20〜60%であり、該浅層改良土
壌は固結材を混合して固結されたものであり、ソイルセ
メント柱状体の先端から道路舗装面までの高さが4m以
上であることを特徴とする道路構築体。
1. A road construction body comprising a soil cement columnar body constructed on soft ground of a road foundation, a shallow layer improved soil laid on the soil cement columnar body, and a road pavement constructed above. The soil cement pillars are arranged in a grid pattern in a plan view, and the grid spacing is not more than twice the height from the upper end of the soil cement pillars to the road pavement surface, and the improvement factor in plan view is 20 to 60%, the shallow layer improved soil is solidified by mixing a solidifying material, and the height from the tip of the soil cement columnar body to the road pavement surface is 4 m or more. Road structure.
【請求項2】 道路基礎の軟弱地盤に構築されたソイル
セメント柱状体と、その上に敷設された浅層改良土壌
と、上部に構築された道路舗装とからなる道路構築体で
あって、該ソイルセメント柱状体は平面配置が非接触形
千鳥配置とされたものであり、その隣接する2本のソイ
ルセメント柱状体の間隔はソイルセメント柱状体の上端
から道路舗装面までの高さの2倍以下であり、平面視改
良率が20〜60%であり、該浅層改良土壌は固結材を
混合して固結されたものであり、ソイルセメント柱状体
の先端から道路舗装面までの高さが4m以上であること
を特徴とする道路構築体。
2. A road construction body comprising a soil cement columnar body constructed on a soft ground of a road foundation, a shallow layer improved soil laid on the soil cement columnar body, and a road pavement constructed above. The soil cement pillars are arranged in a non-contact staggered layout, and the distance between two adjacent soil cement pillars is twice the height from the top of the soil cement pillars to the road pavement surface. It is below, the planar view improvement rate is 20 to 60%, the shallow layer improved soil is solidified by mixing a solidifying material, and the soil from the tip of the soil cement columnar body to the road pavement surface is high. A road construction body having a length of 4 m or more.
【請求項3】 道路基礎の軟弱地盤に埋設されている沈
下の少ない地下構造物の上を横断して道路基礎の軟弱地
盤に構築された道路構築体であって、道路基礎の軟弱地
盤に埋設されている沈下の少ない地下構造物の近傍には
ソイルセメント柱状体の先端から路盤舗装面までの高さ
を4m以上とした長いソイルセメント柱状体が、該地下
構造物から離れるに従って段々に短いソイルセメント柱
状体が、構築されているとともに、該ソイルセメント柱
状体の平面配置は格子状配置であり、格子間隔がソイル
セメント柱状体の上端から道路舗装面までの高さの2倍
以下であり、平面視改良率20〜60%であり、その上
に敷設された改良土壌は固結材を混合して固結したもの
であり、さらに、該地下構造物および改良土壌の上に道
路舗装が構築されていることを特徴とする道路構築体。
3. A road structure constructed on the soft ground of the road foundation by traversing over an underground structure with less subsidence buried in the soft ground of the road foundation, which is buried in the soft ground of the road foundation. A long soil cement columnar body having a height from the tip of the soil cement columnar body to the roadbed pavement surface of 4 m or more in the vicinity of the underground structure with little subsidence is gradually shortened as the distance from the underground structure is increased. The cement columnar body is constructed, and the plane arrangement of the soil cement columnar body is a lattice-like arrangement, and the lattice spacing is not more than twice the height from the upper end of the soil cement columnar body to the road pavement surface, The improvement rate in plan view is 20 to 60%, and the improved soil laid on it is a mixture of solidifying materials and solidified, and road pavement is constructed on the underground structure and the improved soil. Been A road structure characterized by being present.
【請求項4】 道路基礎の軟弱地盤に埋設されている沈
下の少ない地下構造物の上を横断して道路基礎の軟弱地
盤に構築された道路構築体であって、道路基礎の軟弱地
盤に埋設されている沈下の少ない地下構造物の近傍には
ソイルセメント柱状体の先端から路盤舗装面までの高さ
を4m以上とした長いソイルセメント柱状体が、該地下
構造物から離れるに従って段々に短いソイルセメント柱
状体が、構築されているとともに、該ソイルセメント柱
状体の平面配置は非接触形千鳥配置であり、隣接する2
本のソイルセメント柱状体の間隔がソイルセメント柱状
体の上端から道路舗装面までの高さの2倍以下であり、
平面視改良率20〜60%であり、その上に敷設された
改良土壌は固結材を混合して固結したものであり、さら
に、該地下構造物および改良土壌の上に道路舗装が構築
されていることを特徴とする道路構築体。
4. A road structure which is constructed on the soft ground of the road foundation by traversing over an underground structure with little subsidence buried in the soft ground of the road foundation, which is buried in the soft ground of the road foundation. A long soil cement columnar body having a height from the tip of the soil cement columnar body to the roadbed pavement surface of 4 m or more in the vicinity of the underground structure with little subsidence is gradually shortened as the distance from the underground structure is increased. As the cement columns are constructed, the plane arrangement of the soil cement columns is a non-contact staggered arrangement, and the two adjacent
The distance between the soil cement pillars of the book is less than twice the height from the upper end of the soil cement pillars to the road paving surface,
The improvement rate in plan view is 20 to 60%, and the improved soil laid on it is a mixture of solidifying materials and solidified, and road pavement is constructed on the underground structure and the improved soil. Road structure characterized by being.
JP2000248315A 2000-08-18 2000-08-18 Road construction Expired - Lifetime JP3373488B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000248315A JP3373488B2 (en) 2000-08-18 2000-08-18 Road construction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000248315A JP3373488B2 (en) 2000-08-18 2000-08-18 Road construction

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP30429995A Division JP3224503B2 (en) 1995-11-22 1995-11-22 Road construction method

Publications (2)

Publication Number Publication Date
JP2001073305A JP2001073305A (en) 2001-03-21
JP3373488B2 true JP3373488B2 (en) 2003-02-04

Family

ID=18738244

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000248315A Expired - Lifetime JP3373488B2 (en) 2000-08-18 2000-08-18 Road construction

Country Status (1)

Country Link
JP (1) JP3373488B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007211542A (en) * 2006-02-13 2007-08-23 Mitsubishi Heavy Ind Ltd Antiseismic structure of quaywall, and its construction method and device
CN101962929B (en) * 2010-11-05 2013-03-20 华中科技大学 Novel method for processing soft soil subgrade by pile-supporting reinforcing technology
CN103614955B (en) * 2013-11-25 2016-03-16 中国电力工程顾问集团西南电力设计院有限公司 A kind of processing method of soft soil foundation construction road
CN105926391B (en) * 2016-06-12 2018-08-17 西南交通大学 A kind of curb method for widening of existing railway roadbed
JP2019039144A (en) * 2017-08-22 2019-03-14 公益財団法人鉄道総合技術研究所 Foundation structure of structure, and foundation method of structure
CN110258500B (en) * 2019-06-28 2021-03-02 中国二十冶集团有限公司 Method for filling high liquid limit soil in soft foundation area

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2539119B2 (en) * 1991-09-04 1996-10-02 鹿島建設株式会社 Structure of improved ground
JP2577518B2 (en) * 1992-04-03 1997-02-05 次郎 藤増 Construction method of foundation ground such as road on soft ground
JP3251381B2 (en) * 1993-04-27 2002-01-28 株式会社フジタ Liquefaction countermeasures for underground structures
JP2842771B2 (en) * 1993-10-13 1999-01-06 株式会社テノックス Knotted soil cement column construction equipment
JPH07305337A (en) * 1994-05-13 1995-11-21 Haseko Corp Method for reinforcing self-supported earth retaining wall, and earth retaining wall
JPH08151629A (en) * 1994-11-28 1996-06-11 Nippon Dezaia Kk Improving construction method for ground
JP3624514B2 (en) * 1996-02-09 2005-03-02 株式会社フジタ Liquefaction countermeasure method by deep mixing method

Also Published As

Publication number Publication date
JP2001073305A (en) 2001-03-21

Similar Documents

Publication Publication Date Title
JP3653083B2 (en) Road construction method
JPH10317307A (en) Construction method for road
JP5187143B2 (en) Structure to prevent unevenness and eruption due to liquefaction
JP3373488B2 (en) Road construction
CN210066390U (en) Punishment structure suitable for deep weak soil roadbed
JP5067307B2 (en) Road deformation prevention structure and road deformation prevention method
CN109183539A (en) A kind of soft soil roadbed construction method
RU2394959C1 (en) Road surface structure
JP3224503B2 (en) Road construction method
KR101028387B1 (en) Blocks For Subbase And Road Paving Method With The Same Blocks
RU2422581C1 (en) Method to repair and construct arterial highways
JP5150519B2 (en) Iso-sink base plate structure
JPWO2016038688A1 (en) Structure and method for construction, reinforcement, widening and raising of embankments for passing vehicles
JP2006322284A (en) Backfilling material such as plasticizing processing soil and grade separated crossing construction method using the backfilling material
KR100698587B1 (en) The improved pavement
CN210395006U (en) Municipal administration road bed with prevent soil erosion and water loss
JP3881916B2 (en) Method for reducing settlement of soft ground
JP2001073307A (en) Water permeable pavement structure
CN210238175U (en) Road bed for municipal road engineering design
CN210238176U (en) Road subgrade settlement treatment device
JPH0765315B2 (en) Embankment structure
US845910A (en) Road construction.
CN111501459B (en) Roadbed structure of mountain road and construction method thereof
CN213708982U (en) A reinforced structure and road bed for ground
CN214168616U (en) Road of urban trunk road node

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20021112

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

S631 Written request for registration of reclamation of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313631

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081122

Year of fee payment: 6

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081122

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081122

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081122

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111122

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111122

Year of fee payment: 9

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111122

Year of fee payment: 9

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111122

Year of fee payment: 9

S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111122

Year of fee payment: 9

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313117

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141122

Year of fee payment: 12

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141122

Year of fee payment: 12

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

EXPY Cancellation because of completion of term
S531 Written request for registration of change of domicile

Free format text: JAPANESE INTERMEDIATE CODE: R313531

R360 Written notification for declining of transfer of rights

Free format text: JAPANESE INTERMEDIATE CODE: R360

R370 Written measure of declining of transfer procedure

Free format text: JAPANESE INTERMEDIATE CODE: R370