JPH01290894A - Laying change for existing covered conduit - Google Patents
Laying change for existing covered conduitInfo
- Publication number
- JPH01290894A JPH01290894A JP63120623A JP12062388A JPH01290894A JP H01290894 A JPH01290894 A JP H01290894A JP 63120623 A JP63120623 A JP 63120623A JP 12062388 A JP12062388 A JP 12062388A JP H01290894 A JPH01290894 A JP H01290894A
- Authority
- JP
- Japan
- Prior art keywords
- cutter
- existing
- covered conduit
- culvert
- excavator
- 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.)
- Granted
Links
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 239000004567 concrete Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 7
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract 5
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 17
- 150000003839 salts Chemical class 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Sewage (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、既設暗渠を掘進機を用いて掘削撤去しなが
ら、新設暗渠を敷設する既設暗渠の敷設替え工法に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for replacing an existing culvert, in which a new culvert is laid while the existing culvert is excavated and removed using an excavator.
シールド工法は暗渠の敷設のために広く採用されている
が、送水容量不足や強度劣化などによりその暗渠の再敷
設が必要となる。このため、従来は既設暗渠の切り廻し
を行い、流下する水を止めて、主に開削工法により新設
暗渠を敷設している＝〔発明が解決しようとする課題〕
しかしながら、かかる従来の既設暗渠の敷設替え工法に
あっては、既設暗渠を切廻しするための用地を確保する
必要があるほか、この切廻し作業に続く開削作業および
敷設替えの各工程が必要で、多大の工事費を要し、工期
が長びくという問題があった。また、開削工事では道路
の交通規制を必要とするため、交通渋滞を招くという問
題があった。The shield method is widely used for laying underdrains, but due to insufficient water supply capacity or deterioration of strength, the underdrains must be re-laid. For this reason, in the past, existing culverts were cut around to stop the water flowing down, and new culverts were laid mainly using the cut-and-cover method. In the re-laying method, it is necessary to secure land for cutting the existing culvert, and following the cutting work, excavation work and re-laying are required, which requires a large amount of construction cost. The problem was that the construction period was long. Additionally, since excavation work requires road traffic regulation, there is a problem in that it causes traffic congestion.
この発明はかかる従来の問題点に着目してなされたもの
であり、既設暗渠の崩落を生じることなく、安全かつ迅
速に掘削が行えるとともに、交通渋滞を招くことなく、
既設暗渠の敷設替えを安価かつ容易に行える既設暗渠の
敷設替え工法を得ることを目的とする。This invention was made by focusing on such conventional problems, and allows excavation to be carried out safely and quickly without causing the existing culvert to collapse, and without causing traffic congestion.
The purpose of this invention is to obtain a method for replacing existing culverts that can be done cheaply and easily.
この発明にかかる既設暗渠の敷設替え工法は、既設暗渠
内にこれの崩落を防止しながら移動、停止するとともに
、鉄筋切断用のカッタを有する支持装置を設け、上記掘
進機による掘進時または停止時に、上記支持装置を移動
させながら上記カッタにより既設暗渠の鉄筋を切断する
ようにしたものである。また、この発明の別の発明は、
掘進機のカッタフェイスにカッタビット、ディスクカッ
タおよびゲージカッタを設けて、上記カッタビットに土
砂の掘削を行わせ、ディスクカッタおよびゲージカッタ
に鉄筋およびコンクリートの破砕を行わせるようにした
ものである。この発明のさらに別の発明は、既設暗渠の
掘削により生じたコンクリート塩を、カッタフェイスの
中心部に設けた開口部を通して、Ｗｉ出装置により掘進
機外に搬出するようにしたものである。The method for replacing an existing culvert according to the present invention is to move and stop the existing culvert while preventing it from collapsing, and to provide a support device having a cutter for cutting reinforcing bars, so that when the excavator is excavating or stopping, , the reinforcing bars of the existing culvert are cut by the cutter while moving the support device. Moreover, another invention of this invention is
A cutter bit, a disc cutter, and a gauge cutter are provided on the cutter face of the excavator, and the cutter bit is used to excavate earth and sand, and the disc cutter and gauge cutter are used to crush reinforcing bars and concrete. Still another aspect of the present invention is that concrete salt produced by excavating an existing culvert is carried out of the excavator by a Wi extraction device through an opening provided in the center of the cutter face.
この発明における支持装置は既設暗渠内に移動。 The support device in this invention is moved into the existing culvert.
停止自在に設でされて、この既設暗渠を崩落しないよう
に支承しており、掘進機の掘進に並行して移動しながら
、カッタにより既設暗渠内の鉄筋を切断して、掘進機の
ｍ進を助ける。また、掘進機はカッタビットにより土砂
を掘削し、ディスクカッタにより既設暗渠のコンクリー
トおよび鉄筋の破砕、引き抜きを行う。さらに、カッタ
フェイスに設けた開口部は、掘削したコンクリート塩や
水を取り込んで、コンベア等により搬出させやすいよう
に機能し、シールド掘進効率を高める。It is installed so that it can be stopped freely and supports the existing culvert to prevent it from collapsing.While moving parallel to the excavation of the excavator, the cutter cuts the reinforcing bars in the existing culvert, allowing the excavator to move forward in meters. help. In addition, the excavator uses a cutter bit to excavate earth and sand, and a disc cutter to crush and pull out concrete and reinforcing bars in the existing culvert. Furthermore, the opening provided in the cutter face functions to take in the excavated concrete salt and water and easily transport it by a conveyor or the like, increasing shield excavation efficiency.
以下に、この発明の一実施例を図面について説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの発明の方法の実施に用いるシールド掘進装
置を一部切断して示すトンネル軸方向の縦断面図であり
、図において、ｌは地盤２内に敷設された。断面が円形
、焉蹄形、矩形などの既設暗渠であり、この既設暗渠１
内には自走用の飛引ジヤツキ３によって連結された２台
の支持装置４゜５が設けられている。また、支持装置４
には、既設暗渠１の鉄筋を軸方向および円周方向に切断
するためのカッタ６が複数設けられている。７はシール
ド推進装置の掘進機で、これのカッタフェイス８にはコ
ンクリート塩や掘削土砂を取り込んで、搬出装置として
のスクリューコンベア９に渡す開口部１０が設けられて
いる。１１は掘進機７によって掘削された孔内に、立坑
１２から推進敷設された。ヒユーム管などの断面が円形
の新設管、Ｉ３は立坑１２σ内壁に当接した反力受けと
しての支圧壁でこれと最後部の新設管１１との間に押輪
１４を介して複数の元押しジヤツキ１５が介装されてい
る６１６は掘進機７の方向制御ジヤツキ、１７はスクリ
ューコンベア９からのコンクリート塩や流状物をホッパ
ー１８や吸水口１９に受けて排水するホース、２０は立
坑１２の底部に排出した上記コンクリート塩２１などを
地上に運搬するクラムセルパケットである。２２は立坑
１２の底に溜った水を地上に排出する排水用のポンプで
ある。FIG. 1 is a partially cut away vertical cross-sectional view of a shield excavation device used in carrying out the method of the present invention in the tunnel axis direction, and in the figure, l is installed in the ground 2. The existing culvert has a circular, hoof-shaped, or rectangular cross section, and this existing culvert 1
Inside, two supporting devices 4 and 5 connected by a self-propelled flying jack 3 are provided. In addition, the support device 4
is provided with a plurality of cutters 6 for cutting the reinforcing bars of the existing culvert 1 in the axial direction and the circumferential direction. Reference numeral 7 denotes an excavator with a shield propulsion device, and its cutter face 8 is provided with an opening 10 for taking in concrete salt and excavated earth and sand and passing it to a screw conveyor 9 as a carrying-out device. 11 was propelled and laid from a vertical shaft 12 into a hole excavated by an excavator 7. A new pipe with a circular cross section, such as a Huum pipe, I3 is a bearing wall that serves as a reaction force that is in contact with the inner wall of the shaft 12σ, and between this and the new pipe 11 at the rear end, a plurality of main thrusters are connected via push rings 14. Reference numeral 616, in which the jack 15 is installed, is a directional control jack for the excavator 7; 17, a hose that receives concrete salt and fluids from the screw conveyor 9 into the hopper 18 and the water intake port 19 and drains the water; 20, the shaft 12; This is a clam cell packet that transports the concrete salt 21 and the like discharged to the bottom to the ground. 22 is a drainage pump that discharges water accumulated at the bottom of the shaft 12 to the ground.
第２図は上記支持装置４の概略を示すトンネル円周方向
の縦断面図であり、これが枠部材２５と、この枠部材２
５の上部に、油圧シリンダなどの支持手段２６によって
移動自在に支持したアーチ形の支保プレート２７と、枠
部材２５の側部に支持手段２８によって移動自在に支持
したグリッパ２９と、枠部材２５の下端に取付けられた
自走用そり３０とから構成されている６６は上記支保プ
レート２７の外側に突出するように設けられた鉄筋切断
用の上記カッタであり、その切断方向は自由に変えられ
るようになっている。なお、もう一方の支持装置５はカ
ッタ６が設けられないこと以外、支持装置４と基本的構
成は同一である。FIG. 2 is a vertical cross-sectional view in the tunnel circumferential direction showing an outline of the support device 4, and this shows the frame member 25 and the frame member 2.
An arch-shaped support plate 27 is movably supported on the upper part of the frame member 25 by a support means 26 such as a hydraulic cylinder; a gripper 29 is movably supported on the side of the frame member 25 by a support means 28; The cutter 66, consisting of a self-propelled sled 30 attached to the lower end, is the cutter for cutting the reinforcing bars, which is provided so as to protrude outside the supporting plate 27, and the cutting direction can be freely changed. It has become. Note that the other supporting device 5 has the same basic configuration as the supporting device 4 except that the cutter 6 is not provided.
第３図は掘進機７のカッタフェイス８を示す正面図であ
る。このカッタフェイス８の表面側には３個ずつのディ
スクカッタ３１、カッタビット３２およびゲージカッタ
３３がそれぞれ等間隔にＦＩｉ！ｆｆｌされている。FIG. 3 is a front view showing the cutter face 8 of the excavator 7. On the front side of this cutter face 8, three disk cutters 31, three cutter bits 32, and three gauge cutters 33 are arranged at equal intervals FIi! It has been ffl.
第４図は掘進機７付近を示す拡大縦断面図であり、この
図において、３４はカッタ旋回用の油圧モータである。FIG. 4 is an enlarged vertical sectional view showing the vicinity of the excavator 7, and in this figure, 34 is a hydraulic motor for rotating the cutter.
次に、第５図を見ながら動作について説明する。Next, the operation will be explained while referring to FIG.
まず、油圧モータ３４を作動してカッタフェイス８を慄
動し、上記ディスクカッタ３１およびゲージカッタ３３
により既設暗渠１の端面を掘削する。また、カッタビッ
ト３２により既設暗渠１周辺の土砂を掘削する。また、
この掘削動作に並行して、上記カッタ６によりその既設
暗渠１およびその内部の鉄筋を切断した後、既設暗渠１
内にある支持装置４の支保プレート２７およびグリッパ
２９を、しっかりと既設暗渠１の内壁に押し付けさせる
。さらに続いて他方の支持装置５の支保プレート２７お
よびグリッパ２９と内壁との接触圧を緩め、牽引ジヤツ
キ３を収縮させて、その支持装置５を、自走用そり３０
によって支持装置４に対し第５図（ａ）にしめすように
接近させる。そして、かかる状態で上記既設暗渠１の端
部をさらに掘削するように掘進機７を作動前進せしめて
、第５図（ｂ）に示すようにする。なお、この掘削作業
に並行して、後方の立坑１２に設置した元押しジヤツキ
１５により新設管１１を押し込み、これにより支圧壁１
３で反力をとりながら、掘進機７を推進させる。こうし
て、掘進機７が支持装置５に近づいたら掘削を一時停止
し、前方の支持装置４の既設暗渠１に対する上記保持を
緩め、さらに。First, the hydraulic motor 34 is activated to move the cutter face 8, and the disc cutter 31 and the gauge cutter 33 are moved.
Excavate the end face of the existing culvert 1. Also, the earth and sand around the existing culvert 1 is excavated using the cutter bit 32. Also,
In parallel with this excavation operation, the existing culvert 1 and the reinforcing bars inside it are cut by the cutter 6, and then the existing culvert 1 is cut.
The supporting plate 27 and gripper 29 of the supporting device 4 located inside are firmly pressed against the inner wall of the existing underdrain 1. Furthermore, the contact pressure between the support plate 27 and gripper 29 of the other support device 5 and the inner wall is relaxed, the traction jack 3 is contracted, and the support device 5 is moved to the self-propelled sled 30.
The support device 4 is approached as shown in FIG. 5(a). Then, in this state, the excavator 7 is operated and advanced so as to further excavate the end of the existing culvert 1, as shown in FIG. 5(b). In addition, in parallel with this excavation work, the new pipe 11 is pushed in by the main pushing jack 15 installed in the rear shaft 12, and thereby the bearing wall 1
3 to propel the excavator 7 while taking the reaction force. In this way, when the excavator 7 approaches the support device 5, the excavation is temporarily stopped, the above-mentioned holding of the front support device 4 to the existing culvert 1 is loosened, and further.
牽引ジヤツキ３を伸長させると同時にカッタ６による切
断を行いながら、この支持装置４を既設暗渠１内に前進
させる。この状態を第５図（ｃ）に示す。This support device 4 is advanced into the existing underdrain 1 while extending the traction jack 3 and cutting with the cutter 6 at the same time. This state is shown in FIG. 5(c).
次に、このように支持装置４の前進が完了したら、この
支持装置４の支保プレート２７およびグリッパ２９を既
設暗渠１の内壁に押圧させて、この支持装Ｗ４を既設暗
渠１内に保持させる。次に、他の支持装置５の支保プレ
ート２７およびグリッパ２９をその内壁から緩めてフリ
ーとなし、牽引ジヤツキ３を収縮させて、その支持装置
５を支持装置４側へ移動させて、第５図（ｄ）に示すよ
うにする。そして、再び掘進機７を作動して、既設暗渠
の掘削、新設管１１の継ぎ足しおよび推進を行い、第５
図（ａ）の状態および動作に戻る。Next, when the advance of the support device 4 is completed in this way, the support plate 27 and gripper 29 of this support device 4 are pressed against the inner wall of the existing underdrain 1, and this support device W4 is held within the existing underdrain 1. Next, the support plate 27 and gripper 29 of the other support device 5 are loosened from the inner wall thereof, and the traction jack 3 is retracted to move the support device 5 toward the support device 4, as shown in FIG. Do as shown in (d). Then, the excavator 7 is operated again to excavate the existing culvert, add and advance the new pipe 11, and
Return to the state and operation shown in Figure (a).
このように、支持装置４，５による既設暗渠１の保持お
よび移動と、掘進機７の掘削との相互作動を、所定のタ
イミングで互いに関連させて実施することにより、既設
暗渠１の敷設替えが効率的に実施できる。In this way, the holding and moving of the existing culvert 1 by the support devices 4 and 5 and the excavation by the excavator 7 are carried out in relation to each other at a predetermined timing, thereby making it possible to replace the existing culvert 1. Can be implemented efficiently.
なお、上記実施例では新設管１１を継ぎ足しながら既設
暗渠を敷設替えする場合について説明したが、−法覆工
としセグメントを布設することもできる。In the above embodiment, a case has been described in which an existing culvert is replaced while a new pipe 11 is added, but it is also possible to lay segments using a -method lining method.
また、上記開口部１０から取り込んだコンクリート塩は
、スクリューコンベアによって集められ。Further, the concrete salt taken in through the opening 10 is collected by a screw conveyor.
流体輸送、機械輸送、ズリ鋼車、かき寄せなどの残土搬
出手段を用いて、地上に搬出することができる。Surplus soil can be transported to the ground using fluid transportation, mechanical transportation, scraping steel trucks, raking, and other means of transporting surplus soil.
またさらに、既設暗渠１の掘進時または掘進停止時のい
ずれにも、カッタ６による鉄筋の切断を行うことができ
る。Furthermore, the cutter 6 can cut the reinforcing bars either when excavating the existing culvert 1 or when excavating is stopped.
以上のように、この発明によれば既設暗渠内にこれの崩
落を防止しながら移動、停止するとともに、鉄筋切断用
のカッタを有する支持装置を設け、上記掘進機による掘
進時または停止時に、上記支持装置を移動させながら、
上記カッタにより既設暗渠の鉄筋を切断するようにした
ので、上記既設暗渠の掘削時における動力負担を軽減で
き、掘進作業の効率化を図ることができ、工期の短縮化
、工事費の低減が図れるほか、切り廻しのための用地確
保がそれほど問題にならなくなるという効果がある。ま
た、従来の開削工法に比較して、道路の交通規制をする
必要がなくなり、交通渋滞の問題を避けることができる
とともに、コンクリート塩の掘削、撤去を容易に行える
等の効果がある。As described above, according to the present invention, a supporting device is provided that moves and stops inside an existing culvert while preventing it from collapsing, and has a cutter for cutting reinforcing bars, so that when the excavating machine excavates or stops, While moving the support device,
Since the cutter is used to cut the reinforcing bars of the existing culvert, the power burden during excavation of the existing culvert can be reduced, making the excavation work more efficient, shortening the construction period and reducing construction costs. Another effect is that securing land for cutting will become less of a problem. In addition, compared to the conventional cut-and-cover construction method, there is no need to regulate road traffic, thereby avoiding traffic congestion, and it also makes it easier to excavate and remove concrete salt.
また、この発明の別の発明によれば、掘進機のカツタフ
ェイスにカッタビット、ディスクカッタおよびゲージカ
ッタを設けて、上記カッタビットに土砂の掘削を行わせ
、上記ディスクカッタおよびゲージカッタに鉄筋および
コンクリートの破砕を行わせるようにしたので、カッタ
ビット、ディスクカッタおよびゲージカッタに土砂、コ
ンクリートおよび鉄筋の掘削をそれぞれ分担させて行わ
せることができ、鉄筋コンクリートの既設暗渠の掘削、
撤去をより効率的に行ねしめつる。この発明のさらに別
の発明によれば、既設暗渠の掘削により生じたコンクリ
ート塊を、カッタフェイスの中・心部に設けた開口部を
通して、搬出装置により掘進機外に搬出するようにした
ので、コンクリート塊の搬出を効率化でき、これによっ
てシールド掘進速度を上げることができる等の効果が得
られる。According to another aspect of the present invention, a cutter bit, a disc cutter, and a gauge cutter are provided on the cutter face of the excavator, the cutter bit excavates earth and sand, and the disc cutter and gauge cutter cut the reinforcing bar and the gauge cutter. Since the concrete is shredded, the cutter bit, disc cutter, and gauge cutter can be assigned to excavate earth, sand, concrete, and reinforcing bars, respectively, and can be used to excavate existing reinforced concrete culverts,
Make removal more efficient. According to still another aspect of the present invention, the concrete mass produced by excavating the existing culvert is carried out of the excavator by the carrying-out device through the opening provided in the center of the cutter face. Concrete lumps can be carried out more efficiently, which has the effect of increasing shield excavation speed.
第１図はこの発明の方法の実施に用いるシールド掘進装
置を示すトンネル軸方向の縦断面図、第２図は既設暗渠
内の支持装置を一部切断して示すトンネル円周方向の縦
断面図、第３図は掘進機のカッタフェイスを示す正面図
、第４図は第１図の要部を拡大して示す縦断面図、第５
図はシールド掘進装置による掘進動作を示す説明図であ
る。
１・・既設暗渠、４，５・・支持装置、６・・カッタ、
７・・掘進機、８・・カッタフェイス。
９・・搬出装置、１ｏ・・開口部、１１・・新設管。Fig. 1 is a vertical cross-sectional view in the tunnel axis direction showing a shield excavation device used to carry out the method of the present invention, and Fig. 2 is a longitudinal cross-sectional view in the tunnel circumferential direction showing a partially cut away support device in an existing culvert. , Fig. 3 is a front view showing the cutter face of the excavator, Fig. 4 is a vertical sectional view showing an enlarged main part of Fig. 1, and Fig. 5
The figure is an explanatory diagram showing the excavation operation by the shield excavation device. 1. Existing culvert, 4, 5. Support device, 6. Cutter,
7. Excavation machine, 8. Cutter face. 9. Unloading device, 1o. Opening, 11. New pipe.
Claims (1)
を敷設する既設暗渠の敷設替え工法において、上記既設
暗渠内にこれの崩落を防止しながら移動、停止するとと
もに、鉄筋切断用のカッタを有する支持装置を設け、上
記掘進機による掘進時または停止時に、上記支持装置を
移動させながら上記カッタにより既設暗渠の鉄筋を切断
するようにしたことを特徴とする既設暗渠の敷設替え工
法。 ２）掘進機のカッタフェイスにカッタビット、ディスク
カッタおよびゲージカッタを設けて、上記カッタビット
に土砂の掘削を行わせ、ディスクカッタおよびゲージカ
ッタにより鉄筋およびコンクリートの破砕を行わせるよ
うにしたことを特徴とする請求項１記載の既設暗渠の敷
設替え工法。 ３）既設暗渠の掘削により生じたコンクリート塊を、カ
ッタフェイスの中心部に設けた開口部を通して、搬出装
置により掘進機外に搬出するようにしたことを特徴とす
る既設暗渠の敷設替え工法。[Scope of Claims] 1) In a method for replacing an existing culvert by excavating and removing the existing culvert with an excavator and then laying a new culvert, a reinforcing bar is moved and stopped within the existing culvert while preventing it from collapsing. Laying of an existing culvert, characterized in that a support device having a cutter for cutting is provided, and the reinforcing bars of the existing culvert are cut by the cutter while moving the support device when the excavator excavates or stops. Replacement method. 2) A cutter bit, a disc cutter, and a gauge cutter are installed on the cutter face of the excavator, and the cutter bit is used to excavate earth and sand, and the disc cutter and gauge cutter are used to crush reinforcing steel and concrete. The method for replacing existing culverts according to claim 1. 3) A method for re-laying an existing culvert, characterized in that the concrete mass produced by excavating the existing culvert is carried out of the excavator by a carrying-out device through an opening provided in the center of the cutter face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63120623A JPH0730672B2 (en) | 1988-05-19 | 1988-05-19 | Reconstruction method of existing underdrain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63120623A JPH0730672B2 (en) | 1988-05-19 | 1988-05-19 | Reconstruction method of existing underdrain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01290894A true JPH01290894A (en) | 1989-11-22 |
| JPH0730672B2 JPH0730672B2 (en) | 1995-04-10 |
Family
ID=14790810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63120623A Expired - Fee Related JPH0730672B2 (en) | 1988-05-19 | 1988-05-19 | Reconstruction method of existing underdrain |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0730672B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458932A (en) * | 2020-10-29 | 2021-03-09 | 上海市政工程设计研究总院（集团）有限公司 | Non-cutoff connection method for single-hole water diversion box culvert |
-
1988
- 1988-05-19 JP JP63120623A patent/JPH0730672B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458932A (en) * | 2020-10-29 | 2021-03-09 | 上海市政工程设计研究总院（集团）有限公司 | Non-cutoff connection method for single-hole water diversion box culvert |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0730672B2 (en) | 1995-04-10 |
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