JP2006104850A - Overhang roadway block and construction method of the overhang roadway making use of the block - Google Patents

Overhang roadway block and construction method of the overhang roadway making use of the block Download PDF

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JP2006104850A
JP2006104850A JP2004295359A JP2004295359A JP2006104850A JP 2006104850 A JP2006104850 A JP 2006104850A JP 2004295359 A JP2004295359 A JP 2004295359A JP 2004295359 A JP2004295359 A JP 2004295359A JP 2006104850 A JP2006104850 A JP 2006104850A
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overhanging
block
retaining wall
roadway
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JP4468133B2 (en
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Takayuki Otsuki
隆行 大月
Shuji Ono
修司 小野
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Landes Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an overhang roadway block and a construction method of an overhang roadway making use of the block capable of lessening traffic restrictions as much as possible, easily and simply carrying out adjustment of an uneven step/level between both blocks continuously executed within a short construction period of time and improving durability/safety after the construction work. <P>SOLUTION: In the overhang roadway block 11 used for widening the existing road constructing a road side edge of a retaining wall, one end side in the the direction of a long side of an approximately plate-like body is made as an overhang section 2, the other side is made as a weight section 3, while a body plane side is substantially formed in a flat surface, a mounting section 4 to the retaining wall top surface is provided between the overhang section 2 and the weight section 3 in a body bottom side and, at the same time, the weight section 3 is thickly and integrally formed so that the bottom of the weight section 3 is located downward from the bottom of the mounting section 2 to provide height adjusting means 32 and 41 to the mounting section 4 and the bottom of the weight section 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、路側縁が擁壁で構築された道路において、既設擁壁側に張り出すように道路を拡幅するために用いられる張出車道ブロックと、このブロックを用いた張出車道の施工方法に関する。なお、ここにいう擁壁には、水路を構成する側壁のように、道路の端縁に立設される壁状の構造物を含む。   The present invention relates to an overhanging road block that is used to widen a road so that the road side edge is built up with a retaining wall, and projects over the existing retaining wall, and a method for constructing the overhanging road using the block About. In addition, the retaining wall here includes a wall-like structure standing on the edge of the road, such as a side wall constituting the water channel.

山間部の狭幅道路や河川に沿った道路など、路側縁の一方側又は両側が擁壁で構築された道路の場合、交通量増加等により道路幅を拡げる必要が生じたときには、プレキャストタイプの張出コンクリートブロックが用いられることが多い。例えば、特許文献１では、既設の擁壁を最大限に利用しつつ拡幅工事に伴う交通遮断を最小限に抑えるために、下面に結合部を設けたプレキャスト張出ブロックを用い、当該張出ブロックを既設擁壁の天端に対してゴムパッド等の緩衝体を介して固定する一方、張出ブロックの道路面側の下面にカウンターウエイトを設けることとした道路の拡幅工法が提案されている。   In the case of roads that are constructed with retaining walls on one or both sides of the roadside edge, such as narrow roads in the mountains and roads along rivers, when it is necessary to widen the road width due to increased traffic, etc. Overhang concrete blocks are often used. For example, in patent document 1, in order to minimize the traffic interruption accompanying widening construction while utilizing the existing retaining wall to the maximum, a precast overhanging block provided with a connecting portion on the lower surface is used. A road widening method has been proposed, in which a counterweight is provided on the lower surface of the overhanging block on the road surface side, while fixing to the top end of the existing retaining wall through a cushioning body such as a rubber pad.

より具体的には、まず既設擁壁の現行道路内側部分を掘削し、既設擁壁の天端に緩衝体となるゴムパッドを敷設して、このゴムパッドを介しながら、既設擁壁の天端と、搬入した張出ブロックの結合部とをアンカーボルトで固定する。次いで現行道路側に突出している張出ブロックの端部下面にカウンターウエイトをアンカー鋼材によって取り付けた後、路面を敷設舗装して拡幅工事が完了するとされている。   More specifically, first, the current road inner portion of the existing retaining wall is excavated, a rubber pad serving as a buffer is laid on the top edge of the existing retaining wall, and the top edge of the existing retaining wall is inserted through this rubber pad, Fix the connecting part of the overhanging block with the anchor bolt. Next, after the counterweight is attached to the lower surface of the end of the projecting block projecting to the current road side with anchor steel, the road surface is laid and paved to complete the widening work.

一方、こうした張出ブロックは、道路の拡幅工事のみならず、造成宅地等の傾斜面を有効利用する目的でも使用されている。例えば、特許文献２では、側面視クランク状に屈曲したブロックからなり、拡張片の基部に当たる定置部材部分を擁壁上端部に載置するとともに、造成地側にあって地表面より一段低くなった維持部材部分に重しを載せることにより設置される有効利用地拡張用ブロックが提案されている。   On the other hand, these overhanging blocks are used not only for widening roads but also for the purpose of effectively using inclined surfaces such as built-up housing land. For example, in Patent Document 2, it is composed of a block bent in a crank shape when viewed from the side, and a stationary member portion that hits the base of the expansion piece is placed on the upper end of the retaining wall, and is one step lower than the ground surface on the side of the building. An effective use area expansion block that is installed by placing a weight on the maintenance member has been proposed.

このブロックにおいても、先の張出ブロックとほぼ同様に、擁壁より内側部分を掘削して維持部材用の空間を確保し、擁壁の天端に載置したブロックの維持部材に必要に応じてアースアンカーを設けた後、重しを載せてからブロックの上に庭土をかぶせることにより拡幅工事が完了するとされている。   Also in this block, almost the same as the overhanging block above, the space inside the retaining wall is secured by excavating the inner part from the retaining wall, and if necessary for the retaining member of the block placed on the top end of the retaining wall After installing the ground anchor, the widening work is completed by placing a weight and then covering the block with garden soil.

特開２００３−１１９７０３号公報（請求項１及び２、[0023]、図１）JP 2003-119703 A (claims 1 and 2, [0023], FIG. 1) 特開平８−８５９５２号公報（請求項１、図１及び図２）JP-A-8-85952 (Claim 1, FIG. 1 and FIG. 2)

しかしながら、前記特許文献１に記載された張出ブロックでは、既設擁壁の天端に対してゴムパッドを介して直接に載置固定する施工方法を用いているため、既設擁壁の天端が現行道路の路面より低い場合は問題なく施工できるものの、両者が同一レベルに設定されている道路に施工した場合には、掘削対象とならなかった路面との段差を防止するために道路全面を掘削し再舗装しなくてはならない不都合があった。また、施工された張出ブロックは既設擁壁の天端とアンカーボルトで連結されているのみであるから、経年変化や外圧等によってアンカーボルトが断裂し、既設擁壁の外方へ滑落するおそれもあった。さらに、複数個の張出ブロックを連続施工する場合、ブロック間の高低段差をなくすのが困難であるという欠点もあった。   However, the overhanging block described in Patent Document 1 uses a construction method in which it is placed and fixed directly via a rubber pad with respect to the top end of the existing retaining wall. If it is lower than the road surface, it can be constructed without problems, but if both are constructed on the same level of road, the entire road is excavated to prevent a difference from the road surface that was not targeted for excavation. There was an inconvenience that had to be repaved. In addition, since the constructed overhanging block is only connected to the top end of the existing retaining wall with an anchor bolt, the anchor bolt may be torn due to secular change or external pressure, etc., and may slide off the existing retaining wall. There was also. Furthermore, when a plurality of overhanging blocks are continuously constructed, there is a drawback that it is difficult to eliminate the height difference between the blocks.

一方、前記特許文献２に記載されたブロックでは、施工時には側面視クランク状をした定置部材が既設擁壁の天端内側位置と掛合するので、ブロック自体の滑落は確実に防止されることになるものの、やはり既設擁壁の天端に直接載置する方法を用い、仕上げとして新たな庭土をブロック上面に厚くかぶせるよう構成されているため、施工後には庭土の地表面高さが相当程度上昇してしまう不都合があった。また、施工されたブロックの転倒防止を図るため、維持部材に重しとして多数個の砕石を載せることが記載されており、この砕石を新規張出部分のカウンターウエイトとして機能させるよう構成されているが、個々に分離した砕石では、土圧による抵抗力を十分に活かせないし、工数が増加する不都合があった。さらに、複数個のブロックを連続施工する場合、ブロック相互を鋼板製又は合成樹脂製の連結プレートを用い、該連結プレートをアンカーボルトで固定することが予定されているが、やはりブロック間の高低段差をなくすのは困難であったし、連結プレートの耐久性にも疑問が残る。   On the other hand, in the block described in Patent Document 2, a stationary member having a crank shape when viewed from the side engages with a position at the top end of the existing retaining wall, so that sliding of the block itself is reliably prevented. However, since it is configured to cover the top of the block with new garden soil as a finish using the method of placing directly on the top edge of the existing retaining wall, the ground surface height of the garden soil is considerable after construction. There was an inconvenience of rising. Moreover, in order to prevent the fall of the constructed block, it is described that a large number of crushed stones are placed as weights on the maintenance member, and this crushed stone is configured to function as a counterweight for a new overhanging portion. However, the individual crushed stones have the inconvenience that the resistance due to earth pressure cannot be fully utilized and the number of man-hours increases. Furthermore, when a plurality of blocks are continuously constructed, it is planned that the blocks are made of steel plates or synthetic resin connecting plates, and the connecting plates are fixed with anchor bolts. It was difficult to eliminate this, and the durability of the connecting plate remains a question.

しかるに、本発明では、施工時の交通制限を可能なかぎり少なくし、連続施工したブロック間の段差・レベル調節が容易で、簡易かつ短い工期で施工することができ、また、施工後の耐久性・安全性を高めることができる張出車道ブロックと、当該ブロックを用いた張出車道の施工方法の提供を課題とするものである。   However, in the present invention, traffic restrictions during construction are reduced as much as possible, level difference and level adjustment between continuously constructed blocks is easy, construction can be performed in a simple and short construction period, and durability after construction is also achieved. -It is an object to provide an overhanging road block that can enhance safety and a construction method of the overhanging road using the block.

前記所期の課題解決を図るため、本発明では、路側縁が擁壁で構築された道路を擁壁外側方向に拡幅するために用いられる張出車道ブロックとして、概略平板状をした本体の長辺方向一端側を張出部、他端側をウエイト部とし、本体平面側を実質的に平坦面に形成する一方、本体底面側には、前記張出部とウエイト部の間に擁壁頂面への載置部を設けるとともに前記ウエイト部の底面が載置部の底面より下方に位置するようにウエイト部を厚肉かつ一体的に形成して、前記載置部と前記ウエイト部の底面に高さ調節手段を設けた。   In order to solve the desired problem, in the present invention, as the overhanging road block used for widening a road whose road side edge is constructed of a retaining wall in the outward direction of the retaining wall, the length of the main body having a substantially flat plate shape is used. One end side in the side direction is an overhanging portion, the other end side is a weight portion, and the flat surface of the main body is formed as a substantially flat surface, while the bottom surface of the main body has a retaining wall top between the overhanging portion and the weight portion. The mounting portion and the bottom surface of the weight portion are formed integrally with the weight portion so that the mounting portion is provided on the surface and the bottom surface of the weight portion is positioned below the bottom surface of the mounting portion. Is provided with a height adjusting means.

張出車道ブロックの全体形状を概略平板状とすることで工事路面の掘削深度を浅く抑制しつつ、肉厚かつ一体的に形成されたウエイト部を転倒抵抗モーメントを生じさせるために必要かつ十分なカウンターウエイトとして機能させながら、ウエイト部から載置部に至る段差部分によって既設擁壁頂部との係合を図ったのである。   Necessary and sufficient to produce a tipping resistance moment in the thick and integrally formed weight part while keeping the excavation depth of the construction road surface shallow by making the overall shape of the overhang road block into a generally flat plate shape While functioning as a counterweight, engagement with the existing retaining wall top portion was attempted by a step portion from the weight portion to the placement portion.

ウエイト部の底面には、配筋を突設することができる。高さ調節され隣接するブロック同士のレベルを合わせて設置された張出車道ブロックの底面側にも現場においてコンクリートが打設されることになるので、ウエイト部底面から突設された配筋と現場打ちコンクリートが一体化することにより、カウンターウエイトとしてのウエイト部の重量をより増大させることができ、大型車両通行時の荷重にも対応できるようになる。   A bar arrangement can be provided on the bottom surface of the weight portion. Since concrete will be placed on the bottom side of the overhanging road block that has been adjusted to match the level of adjacent blocks, the bar arrangement and the site projecting from the bottom of the weight part By integrating the cast concrete, the weight of the weight portion as the counterweight can be further increased, and it is possible to cope with the load when passing a large vehicle.

前記張出車道ブロックの載置部とウエイト部の底面に設ける高さ調節手段は、載置部における短辺方向に２カ所とウエイト部の底面に１カ所の計３カ所に設けて、天端を除去した既設擁壁頂部２カ所と掘削した道路面１カ所の３点支持とすることができるが、この調節手段としては、ブロック平面から底面に垂直貫通させたボルトの進退を利用したものが好適に用いられる。   The height adjusting means provided on the mounting portion of the overhanging road block and the bottom surface of the weight portion are provided at a total of three locations, two in the short side direction of the mounting portion and one on the bottom surface of the weight portion. This can be supported at three points by two existing retaining wall tops and one excavated road surface, but this adjustment means uses the advancing and retreating of the bolts vertically penetrated from the block plane to the bottom. Preferably used.

前記張出車道ブロックにおける張出部の先端には、実質的に平坦面に形成されたブロック平面側に仕上げ舗装を敷設する際の便宜を図るべく、短辺方向に仕上げ舗装の仕切壁を立設することができる。この仕切壁を仕上げ舗装面より高く設定しておけば、仕切壁を路面排水ブロックと兼用させ、アスカーブの代替として機能させることができるし、さらに必要に応じて仕切壁の一部に排水用の切り欠きを設けるよう構成してもよい。なお、仕切壁は、仕上げ舗装時の転圧作業において転圧機が干渉しないように、道路内側の壁面をやや外方に傾斜させておくとよい。   At the end of the overhanging section of the overhanging road block, a finishing pavement partition wall is provided in the short side direction for convenience when laying the finishing pavement on the block flat surface formed on a substantially flat surface. Can be set. If this partition wall is set higher than the finished pavement surface, the partition wall can also be used as a road surface drainage block, functioning as an alternative to as curve, and if necessary, a part of the partition wall can be used for drainage. You may comprise so that a notch may be provided. In addition, as for a partition wall, it is good to incline the wall surface inside a road a little outward so that a compactor may not interfere in the compaction work at the time of finishing pavement.

また、前記張出車道ブロックにおける張出部の先端には、防護柵装着部を配設することができる。防護柵装着部は、防護柵の支柱を嵌入立設するための穴を備えたもので、張出車道ブロックの短辺を長く設定する場合には間隔をあけながら複数箇所に設けてもよいが、１個のブロックに１箇所のみ設け、複数個のブロックを連続設置した際に所定間隔を保つようにすることもできるほか、防護柵装着部を設けたブロックと防護柵装着部を設けない床版のみのブロックの２種類の張出車道ブロックを提供することにより、床版のみのブロックを用いる個数によって防護柵の支柱間ピッチを調整することが可能となる。   In addition, a protective fence mounting portion can be provided at the tip of the overhang portion of the overhang road block. The protective fence mounting part is equipped with a hole to insert and stand the protective fence column, and when setting the short side of the overhanging road block long, it may be provided at multiple places with intervals between It is possible to keep only a certain interval when a plurality of blocks are continuously installed, and a block with a protective fence mounting part and a floor without a protective fence mounting part. By providing two types of overhanging roadway blocks, which are block-only blocks, it is possible to adjust the pitch between the columns of the protective fence according to the number of blocks using only the floor plates.

前記張出車道ブロックには、本体のウエイト部から載置部に至る長孔を穿設するとともに、ウエイト部の長辺方向両端面において、隣接設置される張出車道ブロックとの連結用凹部を設けて、前記長孔を貫通し両連結用凹部間に連続する配筋用透孔を穿設することにより、コンクリート打設充填作業の容易化と連続設置された張出車道ブロックの強固な一体化が図られることになる。   The overhanging road block is provided with a long hole extending from the weight part of the main body to the mounting part, and at the both end surfaces in the long side direction of the weight part, there are recesses for connection with the overhanging roadway block installed adjacently. By providing a through hole for bar arrangement that penetrates the long hole and is continuous between both connecting recesses, the concrete placement and filling work is facilitated and the continuous overhanging road block is firmly integrated. Will be achieved.

以上のような張出車道ブロックを用いて、本発明に係る張出車道の施工方法では、既存道路における拡幅側車道のみを掘削するとともに既設擁壁の天端を除去し、掘削路面上に連続載置した複数個の張出車道ブロックを高さ調節手段により均して、張出車道ブロックと既設擁壁頂面及び掘削路面との隙間にコンクリートを打設した後、張出車道ブロック上に仕上げ舗装を行うこととした。   In the construction method of the overhanging road according to the present invention using the overhanging road block as described above, only the widening side roadway in the existing road is excavated and the top end of the existing retaining wall is removed and continuously on the excavation road surface. After leveling the plurality of overhanging road blocks placed by the height adjustment means and placing concrete in the gap between the overhanging road block and the existing retaining wall top surface and the excavation road surface, on the overhanging road block It was decided to finish pavement.

また、前記本体に長孔を穿設し、さらに連結用凹部との間に連続する配筋用透孔を穿設した張出車道ブロックを用いた場合における張出車道の施工方法では、既存道路における拡幅側車道のみを掘削するとともに既設擁壁の天端を除去し、既設擁壁の頂部に弾性型枠を配設しながら掘削路面上に連続載置した複数個の張出車道ブロックを高さ調節手段により均し、配筋用透孔内に鉄筋を挿通した後に張出車道ブロックの長孔及び連結用凹部から張出車道ブロックと既設擁壁頂面及び掘削路面との隙間にコンクリートを打設し、次いで張出車道ブロック上に仕上げ舗装を行うこととした。   Further, in the construction method of the overhanging road in the case of using the overhanging road block in which a long hole is drilled in the main body and a continuous penetration hole is formed between the connecting recess, Excavating only the wide side roadway at the top, removing the top end of the existing retaining wall, and placing a plurality of overhanging road blocks continuously placed on the excavation road surface while disposing an elastic formwork on the top of the existing retaining wall After leveling by means of height adjustment means and inserting the reinforcing bar into the reinforcing bar penetration hole, the concrete is put into the gap between the extended road block, the existing retaining wall top surface and the excavation road surface from the long hole of the extended road block and the connecting recess. It was decided to place it and then finish pavement on the overhanging road block.

本発明に係る張出車道ブロックでは、概略平板状をした薄型本体を採用したので、既設擁壁天端の除去量を最小限にとどめながら、拡幅工事の際における掘削深度を浅く抑制することができる。また、ウエイト部に至るまで一体成型されたブロックを掘削路面上に載置施工すると、ウエイト部から載置部に至る底面側の段差部分が既設擁壁頂部と係合するとともに、ウエイト部の後端が埋設土による強い土圧を受け、場合によってはウエイト部の底面から突設された配筋が現場打設コンクリートと一体化することになるので、掘削地盤や既存擁壁へのアンカー固定等を要することなく、施工された張出車道ブロックの転倒安全性を高めることができる。   In the overhanging road block according to the present invention, a thin plate body having a substantially flat plate shape is adopted, so that the excavation depth during the widening work can be suppressed to a shallow level while minimizing the removal amount of the existing retaining wall top. it can. In addition, when the block that is integrally molded up to the weight part is placed on the excavation road surface, the stepped part on the bottom side from the weight part to the placement part engages with the top of the existing retaining wall, and the rear of the weight part. The end is subjected to strong earth pressure due to the buried soil, and in some cases, the bar arrangement that protrudes from the bottom of the weight part will be integrated with the concrete placed on site, so anchoring to the excavated ground or existing retaining wall, etc. Therefore, it is possible to improve the safety of overturning of the overhanging road block constructed.

さらに、ウエイト部を肉厚に形成することで本体長さを短くし、ブロック施工部分を片側車線内に納めることができるので、片側車線が工事対象とならない場合には拡幅工事中もその供用を確保して、交通制限を可能なかぎり少なくすることができる。また、３カ所に設けた高さ調節手段によって、３点支持による安定載置と、隣接する張出車道ブロック相互間の段差・レベル調節の容易化が図られる。   In addition, by forming the weight part thick, the length of the main body can be shortened and the block construction part can be placed in one side lane, so if one side lane is not subject to construction, it can be used even during widening work Secure and limit traffic restrictions as much as possible. In addition, the height adjusting means provided at three places facilitates stable placement by three-point support and adjustment of steps and levels between adjacent overhanging road blocks.

さらにまた、実質的に平坦面に形成された本体平面側は仕上げ舗装も容易であるし、工事対象とならなかった車線側との連続性も確保し易いほか、仕上げ舗装の仕切壁によって舗装面の見切りや路面排水性の確保が容易であるし、道路側を傾斜面として形成した仕切壁は転圧作業の妨げにもならない。また、張出部の先端に防護柵装着部を備えたブロックを床版のみのブロックとは別に提供することにより、床版のみのブロックについては軽量化を図ることができるし、防護柵装着部を備えたブロック間に介在させる床版のみのブロックの個数によって、防護柵の支柱間ピッチを変更することができる。   Furthermore, the main body flat side formed on a substantially flat surface is easy to finish paving, and it is easy to ensure continuity with the lane side that was not the target of construction, and the paving surface is made by the partition wall of the finishing paving. The partition wall formed with the road side as an inclined surface does not interfere with the rolling work. In addition, by providing a block with a protective fence mounting part at the end of the overhanging part separately from the block only for the floor slab, the block only for the floor slab can be reduced in weight, and the protective fence mounting part The pitch between the columns of the protective fence can be changed by the number of blocks of only the floor slab interposed between the blocks provided with.

そして、本発明に係る張出車道の施工方法によれば、既存道路における拡幅対象側の車道のみを掘削するだけでよいし、掘削部分に連続載置した張出車道ブロック同士を、場合により鉄筋を配しながら、コンクリート打設による一体化を図った後に張出車道ブロックを載置した車道のみに仕上げ舗装を行えばよく、地盤等へのアンカー固定や張出部分への補強等を不要にしたために、簡易かつ短い工期で施工することが可能となった。   And according to the construction method of the overhanging road according to the present invention, it is only necessary to excavate only the roadway on the widening target side in the existing road, and the overhanging roadway blocks continuously placed on the excavation part may be rebars depending on the case. It is only necessary to finish the pavement only on the roadway on which the overhanging roadway block is placed after integrating by concrete placement, and it is not necessary to fix the anchor to the ground etc. or to reinforce the overhanging part Therefore, it became possible to construct with a simple and short construction period.

以下、図面に従って本発明を詳細に説明する。図１は本発明に係る張出車道ブロックの一例を示した斜視図であり、図２は同ブロックの平面図、図３は同ブロックの正面図、図４は同ブロックの左側面図、図５は同ブロックの右側面図、図６は同ブロックの底面図、図７は同ブロックのＡ−Ａ断面図、図８は同ブロックのＢ−Ｂ断面図である。これらの図に示されるように、本発明に係る張出車道ブロック11は、平面視横長長方形で概略平板状をした本体の長辺方向左側を張出部２とし、右側をウエイト部３として、本体の平面側を実質的に平坦面に形成する一方、本体の底面側は、前記張出部２とウエイト部３との間を載置部４としている。   Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a perspective view showing an example of an overhanging road block according to the present invention, FIG. 2 is a plan view of the block, FIG. 3 is a front view of the block, FIG. 4 is a left side view of the block, FIG. 5 is a right side view of the block, FIG. 6 is a bottom view of the block, FIG. 7 is an AA sectional view of the block, and FIG. 8 is a BB sectional view of the block. As shown in these drawings, the overhanging road block 11 according to the present invention has a horizontally long rectangular shape in a plan view and the left side in the long side direction of the main body as the overhanging portion 2, and the right side as the weight portion 3. The plane side of the main body is formed to be a substantially flat surface, while the bottom surface side of the main body has a mounting portion 4 between the protruding portion 2 and the weight portion 3.

載置部４は、本発明に係る張出車道ブロックの施工時には、既存道路において路側縁に構築されている擁壁頂部に位置することになる部位であり、これより左側に位置している張出部２が実質的な拡幅部分となるわけである。前記載置部４には高さ調節手段としての調節ボルト41が短辺方向２カ所に間隔をおいて設けられている。これら２カ所の調節ボルト41は、いずれも上下方向に貫通した透孔42内に螺入されて、ブロック平面側からの回転操作によりブロック底面側において上下方向に進退可能に構成されている。   The mounting part 4 is a part that will be located at the top of the retaining wall constructed at the roadside edge on the existing road when the overhanging road block according to the present invention is constructed. The protruding portion 2 becomes a substantially widened portion. The mounting portion 4 is provided with adjusting bolts 41 as height adjusting means at intervals at two locations in the short side direction. Each of these two adjustment bolts 41 is screwed into a through hole 42 penetrating in the vertical direction, and is configured to be able to advance and retract in the vertical direction on the block bottom surface side by a rotation operation from the block plane side.

一方、前記ウエイト部３は、その底面が載置部４の底面より下方に位置するように、厚肉かつ本体と一体的に形成されている。したがって、載置部４からウエイト部３に至る境目部分には段差31が形成されることになり、施工時にはこの段差31によって既設擁壁頂部との係合が図られ、安易な脱落が防止される。また、ウエイト部３の端縁寄りには高さ調節手段としての調節ボルト32が配設されており、前記載置部４に設けられた２カ所の調節ボルト41とともに張出車道ブロックを３点支持することになる。なお、ウエイト部３における調節ボルト32は、ブロックの後端付近にあるために回転操作が容易であることから、ウエイト部３を貫通させることなく、ウエイト部３の底面側より突設させるにとどめている。   On the other hand, the weight part 3 is thick and formed integrally with the main body so that the bottom surface thereof is located below the bottom surface of the mounting part 4. Therefore, a step 31 is formed at the boundary portion from the placing portion 4 to the weight portion 3, and at the time of construction, the step 31 is engaged with the top of the existing retaining wall, thereby preventing easy dropout. The Further, an adjustment bolt 32 as a height adjusting means is disposed near the edge of the weight portion 3, and three overhanging roadway blocks are mounted together with the two adjustment bolts 41 provided in the mounting portion 4. I will support it. Since the adjustment bolt 32 in the weight portion 3 is near the rear end of the block and is easy to rotate, the adjustment bolt 32 is protruded from the bottom surface side of the weight portion 3 without penetrating the weight portion 3. ing.

張出部２の先端平面側には、短辺方向となる先端縁に沿った仕切壁21が立設されている。この仕切壁21の高さは、仕上げ舗装面に一致するように設定しておいてもよいし、より高く設定してアスカーブ代替として機能させてもよく、また、一部に排水用の切り欠きを設けてもよいことは既に述べたとおりである。なお、仕上げ舗装を行う転圧機が接触しないように、仕切壁21は道路側をやや傾斜させている。   A partition wall 21 is erected on the front end flat surface side of the overhang portion 2 along the front end edge in the short side direction. The height of the partition wall 21 may be set so as to match the finished pavement surface, or may be set higher to function as an as-curve substitute. As described above, may be provided. It should be noted that the partition wall 21 is slightly inclined on the road side so that the compacting machine for finishing paving does not come into contact.

ウエイト部３から載置部４にかけては、ブロック本体の短辺方向ほぼ中央部分において長孔33が穿設されるとともに、ウエイト部３の長辺方向両端面には連結用凹部34, 34が、それぞれ側縁を切り欠いたように設けられ、さらに前記長孔33を貫通し両連結用凹部34, 34に至るよう連続した２本の配筋用透孔35, 35が穿設されている。これら長孔33や連結用凹部34、配筋用透孔35は、ブロック全体の重量軽減に貢献するほか、隣接設置される張出車道ブロックとの間に架け渡すように配筋用透孔35, 35内に鉄筋を挿通してからコンクリートを打設することによって、設置した張出車道ブロック同士の一体化を実現するのである。   From the weight part 3 to the mounting part 4, a long hole 33 is bored at a substantially central part in the short side direction of the block body, and connection concave parts 34, 34 are provided at both end faces in the long side direction of the weight part 3. There are provided two through-holes 35 and 35 for bar arrangement which are provided so as to cut out the side edges, and continue through the long hole 33 to reach both the connecting recesses 34 and 34. These long holes 33, connecting recesses 34, and reinforcing bar penetration holes 35 contribute to weight reduction of the entire block, and the reinforcing bar penetration holes 35 are bridged between adjacent overhanging road blocks. , 35, by inserting the reinforcing bars into the concrete, and then placing the concrete, it is possible to integrate the overhanging roadway blocks installed.

図９は、本発明に係る張出車道ブロックの他の例を示した斜視図であり、図10は同ブロックの平面図、図11は同ブロックの正面図、図12は同ブロックの左側面図、図13は同ブロックの底面図、図14は同ブロックのＣ−Ｃ断面図である。本例の張出車道ブロック12は、張出部２の先端に防護柵装着部22が配設されていることと、ウエイト部３の底面に配筋６が突設されていることを除けば、先の図１等の例の張出車道ブロック11と基本構成は同一である。すなわち、張出部２の先端には、防護柵の支柱が嵌入立設されることになるほぼ垂直な穴221が穿設された防護柵装着部22が設けられている一方、ウエイト部３の底面には、長辺方向２カ所に並列するように、正面視コ字形をした配筋６が配設されており、これら防護柵装着部22と配筋６が先の図１等に示した床版のみからなる張出車道ブロック11に付加された形態となっている。   9 is a perspective view showing another example of the overhanging road block according to the present invention, FIG. 10 is a plan view of the block, FIG. 11 is a front view of the block, and FIG. 12 is a left side view of the block. FIG. 13 is a bottom view of the block, and FIG. 14 is a sectional view taken along the line CC of the block. The overhanging road block 12 of this example is except that the protective fence mounting portion 22 is disposed at the tip of the overhanging portion 2 and that the reinforcing bar 6 is protruded from the bottom surface of the weight portion 3. The basic configuration is the same as the overhanging road block 11 in the example of FIG. That is, at the tip of the overhanging portion 2, there is provided a protective fence mounting portion 22 in which a substantially vertical hole 221 into which a support fence post is inserted and erected, while the weight portion 3 A bar arrangement 6 having a U-shape in front view is arranged on the bottom surface so as to be parallel to two places in the long side direction. The guard fence mounting portion 22 and the bar arrangement 6 are shown in FIG. It is a form added to the overhanging road block 11 consisting only of a floor slab.

図15は、本発明に係る張出車道ブロックの施工例を擁壁側からみた概略側面図である。先の図１等に示した床版のみの張出車道ブロック11を挟むように、先の図９等に示した防護柵装着部22を備えた張出車道ブロック12を交互に設置したもので、防護柵支柱51とガードレール52とからなる防護柵５が設置されている状態が示されている。本例では床版のみの張出車道ブロック11を１個とし、防護柵支柱51間ピッチを狭く設定しているが、床版のみの張出車道ブロック11を２個以上連続設置すれば、防護柵支柱51間ピッチを広く設定することができるわけである。   FIG. 15 is a schematic side view of a construction example of the overhanging road block according to the present invention as seen from the retaining wall side. The overhanging road block 12 having the protective fence mounting portion 22 shown in the previous FIG. 9 etc. is alternately installed so as to sandwich the overhanging road block 11 of only the floor slab shown in the previous FIG. The state where the protective fence 5 composed of the protective fence column 51 and the guard rail 52 is installed is shown. In this example, there is only one overhanging roadway block 11 with a floor slab and the pitch between the guard fence columns 51 is set narrow. However, if two or more overhanging roadway blocks 11 with only a floor slab are installed continuously, protection will be provided. That is, the pitch between the fence posts 51 can be set widely.

次に、前記張出車道ブロックを用いた張出車道の施工方法について説明する。図16は、拡幅施工対象となる既存道路の概略横断面図である。この例の既存道路Ｒは、図中右側の路側縁が切り通し面Ｋであり、図中左側の路側縁がコンクリート製の擁壁Ｃとなっている。例えば既存道路Ｒの幅員が４mである場合、普通車同士の対向は可能であるが、一方又は双方が大型車となると対向できない道路ということになる。なお、既設の擁壁Ｃは、例えば水路の側壁であっても何ら変わりはなく、本発明では、こうした擁壁Ｃの外側方向に対して道路を拡幅するものである。   Next, the construction method of the overhanging road using the overhanging road block will be described. FIG. 16 is a schematic cross-sectional view of an existing road to be widened. In the existing road R in this example, the roadside edge on the right side in the figure is a cut-through surface K, and the roadside edge on the left side in the figure is a retaining wall C made of concrete. For example, when the width of the existing road R is 4 m, ordinary cars can face each other, but if one or both become large cars, the roads cannot face each other. The existing retaining wall C is not changed even if it is a side wall of a water channel, for example. In the present invention, the road is widened with respect to the outer direction of the retaining wall C.

図17は、既存道路における拡幅側車道を掘削し、既設擁壁の天端を除去した状態を示す概略横断面図である。前記幅員４mの既存道路Ｒを１ｍ拡幅する場合、本発明に係る前記張出車道ブロックを敷設するために、拡幅側の車線R1のみを掘削するとともに既設の擁壁Ｃの天端を除去する。本発明に係る張出車道ブロックは、その張出部２のカウンターウエイトとして機能させるウエイト部３を一体成型で厚肉に形成することによって、ブロックの長辺方向の長さを拡幅側の車道内に収まる長さに設定しているので、反対側車線R2については掘削工事を行う必要がなく、片側車線R2を供用したまま拡幅工事を継続することができる。   FIG. 17 is a schematic cross-sectional view showing a state in which the wide side roadway in the existing road is excavated and the top end of the existing retaining wall is removed. When the existing road R having a width of 4 m is widened by 1 m, only the widened lane R1 is excavated and the top end of the existing retaining wall C is removed in order to lay the overhanging road block according to the present invention. In the overhanging road block according to the present invention, the weight part 3 that functions as a counterweight of the overhanging part 2 is formed integrally to be thick, so that the length in the long side direction of the block is increased in the wide roadway. Therefore, it is not necessary to perform excavation work for the opposite lane R2, and the widening work can be continued while the one lane R2 is in use.

図18は、張出車道ブロックを敷設している状態を示した概略横断面図である。掘削した車線R1の掘削路面上に基礎砕石CRを敷き均し、擁壁Ｃの除去した天端部分における外縁付近に弾性型枠Ｆを設置した後に、張出車道ブロック12を敷設していく。床版のみからなり防護柵装着部22を有しない前記張出車道ブロック11の場合も同様に敷設する。弾性型枠Ｆとしては、帯状のゴム又はスポンジ等が好適に用いられる。   FIG. 18 is a schematic cross-sectional view showing a state in which an overhanging road block is laid. After laying the foundation crushed stone CR on the excavated road surface of the excavated lane R1, and installing the elastic formwork F in the vicinity of the outer edge at the top end portion where the retaining wall C is removed, the overhanging road block 12 is laid. In the case of the overhanging road block 11 which is composed only of a floor slab and does not have the protective fence mounting portion 22, it is laid in the same manner. As the elastic mold F, a belt-like rubber or sponge is preferably used.

引き続き、連続設置された張出車道ブロック12のレベル調節を行う。図19に示されるように、レベル調節は、天端を除去した擁壁Ｃ上の２カ所と、ブロック後端寄りウエイト部３の底面に１カ所の計３カ所配設された調節ボルト32, 42の進退によって行われ、同時に、配筋用透孔35内や必要により大型車両対策として設けられた配筋６内に挿通するように、短辺方向に適当本数の鉄筋を挿入した後、長孔33や連結用凹部34からコンクリートを打設し、連続設置した張出車道ブロック１と既設擁壁Ｃの頂面や掘削路面との隙間にコンクリートを充填し、ブロック同士の一体化を図る。   Subsequently, the level of the overhang road block 12 continuously installed is adjusted. As shown in FIG. 19, the level adjustment is performed by adjusting bolts 32, which are arranged in three places, two places on the retaining wall C from which the top end is removed and one place on the bottom face of the weight portion 3 near the rear end of the block. After inserting an appropriate number of rebars in the short side direction so as to be inserted into the reinforcing bar penetration hole 35 and, if necessary, the reinforcing bar 6 provided as a measure for large vehicles, Concrete is cast from the holes 33 and the connecting recesses 34, and concrete is filled in the gap between the continuously installed overhanging road block 1 and the top surface of the existing retaining wall C or the excavation road surface, and the blocks are integrated.

次いで、設置された張出車道ブロック12の周辺空間の埋め戻しと、仕上げ舗装を行う。図20は、設置された張出車道ブロック12の平面側に仕上げ舗装を施した状態を示した概略横断面図である。仕上げ舗装は、ブロック先端に立設された仕切壁21の天端に揃えておこなってもよいし、仕切壁21をアスカーブ代替とする場合には仕切壁21の天端より控えた位置まで行えばよい。最後に、防護柵５を設置することにより張出車道の施工が完了する（図21）。   Next, the surrounding space of the installed overhangway block 12 is backfilled and finish paving is performed. FIG. 20 is a schematic cross-sectional view showing a state in which finish pavement is applied to the flat side of the overhang road block 12 installed. Finishing pavement may be done in line with the top of the partition wall 21 standing at the end of the block. Good. Finally, the construction of the overhang road is completed by installing the protective fence 5 (FIG. 21).

本発明に係る張出車道ブロックの一例を示した斜視図である。It is the perspective view which showed an example of the overhanging road block based on this invention. 図１の例の張出車道ブロックの平面図である。It is a top view of the overhanging road block of the example of FIG. 図１の例の張出車道ブロックの正面図である。It is a front view of the overhanging road block of the example of FIG. 図１の例の張出車道ブロックの左側面図である。It is a left view of the overhanging road block of the example of FIG. 図１の例の張出車道ブロックの右側面図である。It is a right view of the overhanging road block of the example of FIG. 図１の例の張出車道ブロックの底面図である。It is a bottom view of the overhanging road block of the example of FIG. 図１の例の張出車道ブロックのＡ−Ａ断面図である。It is AA sectional drawing of the overhanging road block of the example of FIG. 図１の例の張出車道ブロックのＢ−Ｂ断面図である。It is BB sectional drawing of the overhanging road block of the example of FIG. 張出部の先端に防護柵装着部を設けた、本発明に係る張出車道ブロックの他の例を示した斜視図である。It is the perspective view which showed the other example of the overhanging road block based on this invention which provided the protection fence mounting part in the front-end | tip of the overhanging part. 図９の例の張出車道ブロックの平面図である。It is a top view of the overhanging road block of the example of FIG. 図９の例の張出車道ブロックの正面図である。It is a front view of the overhanging road block of the example of FIG. 図９の例の張出車道ブロックの左側面図である。It is a left view of the overhanging road block of the example of FIG. 図９の例の張出車道ブロックの底面図である。It is a bottom view of the overhanging road block of the example of FIG. 図９の例の張出車道ブロックのＣ−Ｃ断面図である。It is CC sectional drawing of the overhanging road block of the example of FIG. 本発明に係る張出車道ブロックの施工例を擁壁側からみた概略側面図である。It is the schematic side view which looked at the construction example of the overhanging road block concerning this invention from the retaining wall side. 拡幅施工対象となる既存道路の概略横断面図である。It is a schematic cross-sectional view of the existing road used as widening construction object. 既存道路における拡幅側車道を掘削し、既設擁壁の天端を除去した状態を示す概略横断面図である。It is a schematic cross-sectional view which shows the state which excavated the wide side roadway in the existing road, and removed the ceiling end of the existing retaining wall. 張出車道ブロックを敷設している状態を示した概略横断面図である。It is the schematic cross-sectional view which showed the state which has laid the overhanging road block. コンクリートを打設して張出車道ブロック同士の一体化を図っている状態を示した概略横断面図である。It is the general | schematic cross-sectional view which showed the state which aims at integration of the overhanging roadway blocks by placing concrete. 設置された張出車道ブロックの平面側に仕上げ舗装を施した状態を示した概略横断面図である。It is the schematic cross-sectional view which showed the state which gave the finishing pavement to the plane side of the overhanging road block installed. 防護柵を設置し、張出車道の施工工事が完了した状態を示した概略横断面図である。It is the schematic cross-sectional view which showed the state which installed the protection fence and completed the construction work of the overhanging roadway.

符号の説明Explanation of symbols

２ 張出部
３ ウエイト部
４ 載置部
５ 防護柵
６ 配筋
11 床版のみの張出車道ブロック
12 防護柵装着部を設けた張出車道ブロック
31 段差
32 調節ボルト
33 長孔
34 連結用凹部
35 配筋用透孔
41 調節ボルト
42 透孔
51 防護柵支柱
52 ガードレール
Ｃ 擁壁
ＣＲ 基礎砕石
Ｆ 弾性型枠
Ｋ 切り通し面
Ｒ 既存道路 2 Overhanging part 3 Weight part 4 Placement part 5 Guard fence 6 Reinforcement
11 Overhang road block with floor slab only
12 Overhang road block with protective fence mounting part
31 steps
32 Adjustment bolt
33 Slotted hole
34 Connection recess
35 Bar arrangement holes
41 Adjustment bolt
42 Through-hole
51 Guard fence support
52 Guardrail C Retaining wall CR Foundation crushed stone F Elastic formwork K Cutting surface R Existing road

Claims (8)

路側縁が擁壁で構築された道路を擁壁外側方向に拡幅するために用いられる張出車道ブロックであって、概略平板状をした本体の長辺方向一端側を張出部、他端側をウエイト部とし、本体平面側を実質的に平坦面に形成する一方、本体底面側には、前記張出部とウエイト部の間に擁壁頂面への載置部を設けるとともに前記ウエイト部の底面が載置部の底面より下方に位置するようにウエイト部を厚肉かつ一体的に形成して、前記載置部と前記ウエイト部の底面に高さ調節手段を設けてなる張出車道ブロック。 A roadway block used to widen a road whose roadside edge is constructed of a retaining wall in the outward direction of the retaining wall, with one end side in the long side direction of the roughly flat main body being the overhanging part and the other end side The weight of the weight portion is formed on the bottom surface of the main body, while a mounting portion on the top surface of the retaining wall is provided between the protruding portion and the weight portion on the bottom surface side of the main body. The overhanging road, in which the weight portion is formed thick and integrally so that the bottom surface of the mounting portion is positioned below the bottom surface of the mounting portion, and the height adjusting means is provided on the bottom surface of the mounting portion and the weight portion. block. ウエイト部の底面より配筋が突設されてなる請求項１記載の張出車道ブロック。 The overhanging road block according to claim 1, wherein reinforcing bars project from the bottom surface of the weight portion. 高さ調節手段が、載置部における短辺方向に２カ所とウエイト部の底面に１カ所の計３カ所設けられていることを特徴とする請求項１又は２いずれかに記載の張出車道ブロック。 The overhanging road according to claim 1 or 2, wherein the height adjusting means is provided in three places, two places in the short side direction of the placing section and one place on the bottom surface of the weight section. block. 張出部が、その先端において短辺方向に仕上げ舗装の仕切壁が立設されたものである請求項１ないし３いずれかに記載の張出車道ブロック。 The overhanging road block according to any one of claims 1 to 3, wherein the overhanging portion has a finish pavement partition wall standing in the short side direction at the tip thereof. 張出部が、その先端に防護柵装着部が配設されたものである請求項１ないし４いずれかに記載の張出車道ブロック。 The overhanging road block according to any one of claims 1 to 4, wherein the overhanging portion is provided with a protective fence mounting portion at a tip thereof. 本体にはウエイト部から載置部に至る長孔が穿設されるとともに、ウエイト部の長辺方向両端面には隣接設置される張出車道ブロックとの連結用凹部が設けられて、前記長孔を貫通し両連結用凹部間に連続する配筋用透孔が穿設されていることを特徴とする請求項１ないし５いずれかに記載の張出車道ブロック。 The main body is provided with a long hole extending from the weight portion to the mounting portion, and at both end surfaces in the long side direction of the weight portion, there are provided recesses for connection with the overhanging roadway block that is installed adjacently. The overhanging road block according to any one of claims 1 to 5, wherein a through-hole for reinforcing bar arrangement is formed through the hole and continuous between both connecting recesses. 既存道路における拡幅側車道のみを掘削するとともに既設擁壁の天端を除去し、掘削路面上に連続載置した複数個の張出車道ブロックを高さ調節手段により均して、張出車道ブロックと既設擁壁頂面及び掘削路面との隙間にコンクリートを打設した後、張出車道ブロック上に仕上げ舗装を行うことを特徴とする請求項１ないし６いずれかに記載の張出車道ブロックを用いた張出車道の施工方法。 Excavate only the wide side roadway on the existing road, remove the top end of the existing retaining wall, level the multiple overhanging road blocks continuously placed on the excavation road surface by the height adjusting means, and overhang the roadway block The overhanging road block according to any one of claims 1 to 6, wherein concrete is placed in the gap between the top surface of the existing retaining wall and the excavation road surface, and then finish paving is performed on the overhanging road block. The construction method of the overhang road used. 既存道路における拡幅側車道のみを掘削するとともに既設擁壁の天端を除去し、既設擁壁の頂部に弾性型枠を配設しながら掘削路面上に連続載置した複数個の張出車道ブロックを高さ調節手段により均し、配筋用透孔内に鉄筋を挿通した後に張出車道ブロックの長孔及び連結用凹部から張出車道ブロックと既設擁壁頂面及び掘削路面との隙間にコンクリートを打設し、次いで張出車道ブロック上に仕上げ舗装を行うことを特徴とする請求項６に記載の張出車道ブロックを用いた張出車道の施工方法。 A plurality of overhanging road blocks continuously excavated on the excavation road surface while excavating only the wide roadway on the existing road, removing the top end of the existing retaining wall, and arranging an elastic formwork on the top of the existing retaining wall After adjusting the height by means of height adjustment and inserting the reinforcing bar into the through hole for bar arrangement, from the long hole of the overhanging road block and the recess for connection to the gap between the overhanging road block, the top surface of the existing retaining wall and the excavation road surface 7. The construction method of the overhanging road using the overhanging road block according to claim 6, wherein concrete is placed and then finish paving is performed on the overhanging road block.
JP2004295359A 2004-10-07 2004-10-07 Overhangway block and method for constructing overhangway using the block Active JP4468133B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006265857A (en) * 2005-03-22 2006-10-05 Landes Co Ltd Overhanging roadway block, and method of constructing overhanging roadway using the block
JP2010174475A (en) * 2009-01-28 2010-08-12 Daiwa-Cres Co Ltd Structure for widening road
KR101772940B1 (en) * 2015-03-05 2017-08-30 전종환 Precast concrete retaining wall

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006265857A (en) * 2005-03-22 2006-10-05 Landes Co Ltd Overhanging roadway block, and method of constructing overhanging roadway using the block
JP4700987B2 (en) * 2005-03-22 2011-06-15 ランデス株式会社 Overhangway block and method for constructing overhangway using the block
JP2010174475A (en) * 2009-01-28 2010-08-12 Daiwa-Cres Co Ltd Structure for widening road
JP4726260B2 (en) * 2009-01-28 2011-07-20 大和クレス株式会社 Overhang sidewalk structure
KR101772940B1 (en) * 2015-03-05 2017-08-30 전종환 Precast concrete retaining wall

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