【０００１】
【発明の属する技術分野】
本発明は、コンクリート製の管路の補修又は更生において、耐蝕性内周面を形成すると共に、管壁を補強する管路補修更生工法に関する。
【０００２】
【従来の技術】
従来、下水管渠等の地中に敷設されたコンクリート製の管路の補修においては、例えば、図７に示すように、多数の突起（アンカー）が外周側に固設された筒形の柔軟性を有するシート状部材３を管路１の内周側に挿入し、シート状部材３の内周側に水等の加圧液体７を充填してシート状部材３を膨らませ、その状態でシート状部材３の外周側にセメント質物質組成物９を注入して固化させ、シート状部材３の外周側の突起をセメント質物質組成物９中に埋め込むようにしてシート状部材３を付着させ、シート状部材３により耐蝕性内周面を形成している。
【０００３】
【発明が解決しようとする課題】
上述の工法では、シート状部材３の外周側に注入されるセメント質物質組成物９により管路１のヒビ割れ等を封鎖することができるが、地上に敷設されたコンクリート製の管路の補修、更生などにおいては、管壁の補強が必要な場合があり、上述のシート状部材３、セメント質物質組成物９のみでは補強が十分でないという問題があった。
【０００４】
本発明は、このような従来の問題に鑑み、耐蝕性内周面を形成すると共に、管壁を補強する管路補修更生工法の提供を目的としたものである。
【０００５】
【課題を解決するための手段】
上述の如き従来の問題を解決し、所期の目的を達成するための本発明の特徴は、コンクリート製の管路の内周側に鉄筋カゴを設置し、前記鉄筋カゴの内周側に多数の連通孔が開けられた筒形のネット状部材を設置し、前記ネット状部材の内周側に前記連通孔に比して幅太の多数の突起が外周側に固設された筒形の柔軟性を有するシート状部材を挿入し、前記シート状部材の内周側に加圧気体又は加圧液体を充填して前記シート状部材を膨らませた状態で、前記シート状部材の外周側にセメント質物質組成物を注入して固化させることにある。
【０００６】
【発明の実施の形態】
次に本発明の実施の形態を図１〜図６について説明する。
【０００７】
図において、１１はコンクリート製の円筒形の管路、３は型枠を構成すると供に耐蝕性内周面を形成する筒形のシート状部材、１３は管壁を補強する円筒形の鉄筋カゴ、１５はシート状部材３と鉄筋カゴ１３間に介在してシート状部材３の挿入作業を円滑にする円筒形のネット状部材である。
【０００８】
シート状部材３は、挿入作業が容易なように、高密度ポリエチレン等の合成樹脂材をもって柔軟に形成されており、また、付着力を向上させるため、図５、図６に示すように、筒状のシート本体４の外周面に多数の突起（アンカー）５、５…が千鳥配置に固設され、突起５は先端部が根元部に比して幅太な傘状に成形されている。
【０００９】
また、ネット状部材１５は、図４に示すように、合成樹脂材、金属材料等をもって、シート状部材３に比して剛性が大きく円筒形を保持するように形成されており、ネット状部材１５には、モルタル等のセメント質物質組成物９が通過可能なように、多数の連通孔１６、１６…が表裏に貫通して開けられ、連通孔１６は、シート状部材３の突起５が引っ掛からないように、突起５の先端部に比して幅細に成形されている。
【００１０】
シート状部材３、鉄筋カゴ１３、ネット状部材１５等により管路１１の補修、更生を行うには、まず、管路１１の内周面表層の劣化部分を破砕除去した後に、図１に示すように、管路１１の内周側に鉄筋カゴ１３をスペーサー等を介して所定位置に設置し、更に、鉄筋カゴ１３の内周側にネット状部材１５を設置する。
【００１１】
そして、図２に示すように、シート状部材３を、折り畳んだ状態で管路１１の一方側から送り込みつつ他方側から引っ張るようにして、ネット状部材１５の内周側に挿入する。即ち、鉄筋カゴ１３とシート状部材３との間にはネット状部材１５が介在し、更に、ネット状部材１５の連通孔１６、１６…は幅細であるので、シート状部材３は、外周側の多数の突起５、５…が鉄筋カゴの鉄筋やネット状部材１５の連通孔１６、１６…に引っ掛かることなく、円滑に挿入される。
【００１２】
次に、図３に示すように、シート状部材３の内周側に水等の加圧液体７を充填してシート状部材３を円筒形に膨らませて、この状態でシート状部材３の外周側にモルタル等のセメント質物質組成物９を注入して、鉄筋カゴ１３及びシート状部材３の突起５、５…をセメント質物質組成物９中に埋め込む。そして、セメント質物質組成物９の固化後、加圧液体７を排出する。
【００１３】
このように、シート状部材３を加圧液体７を介して円筒形に保持することによってシート状部材３を設置容易な型枠として用いることができ、また、ネット状部材１５の連結孔１６、１６…を介してセメント質物質組成物９を連通させることによってシート状部材３を好適に付着させることができるので、鉄筋カゴ１３による管壁の補強とシート状部材３による耐蝕性内周面の形成とを効率的に行うことができる。
【００１４】
【発明の効果】
上述のように、本発明に係る管路補修更生工法は、管壁を補強する鉄筋カゴと、型枠を構成すると共に耐蝕性内周面を形成するシート状部材との間に、多数の連通孔を有するネット状部材を介在させ、ネット状部材の連通孔をシート状部材の突起に比して幅細にすることによって、シート状部材の挿入作業を容易に行うことができると共に、鉄筋カゴとシート状部材の突起とをセメント質物質組成物中に好適に埋設することができ、耐蝕性内周面の形成と管壁の補強とを効率的に行うことができる。
【図面の簡単な説明】
【図１】 本発明に係る管路補修更生工法の実施の形態であって、第１工程を示す横断面図である。
【図２】 本発明に係る管路補修更生工法の実施の形態であって、第２工程を示す横断面図である。
【図３】 本発明に係る管路補修更生工法の実施の形態であって、第３工程を示す横断面図である。
【図４】 図３中のネット状部材の展開図である。
【図５】 図３中のシート状部材の展開図である。
【図６】 図５のＡ−Ａ線による断面図である。
【図７】 従来の管路補修工法の一例を示す横断面図である。
【符号の説明】
３ シート状部材
４ シート本体
５ 突起（アンカー）
７ 加圧液体（水）
９ セメント質物質組成物（モルタル）
１１ 管路
１３ 鉄筋カゴ
１５ ネット状部材
１６ 連通孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe repair / rehabilitation method for forming a corrosion-resistant inner peripheral surface and reinforcing a pipe wall in repair or rehabilitation of a concrete pipe.
[0002]
[Prior art]
Conventionally, in the repair of concrete pipes laid in the ground, such as sewer pipes, for example, as shown in FIG. 7, a cylindrical flexible structure in which a number of protrusions (anchors) are fixed on the outer peripheral side. The sheet-like member 3 having the properties is inserted into the inner peripheral side of the conduit 1, and the sheet-like member 3 is inflated by filling the inner peripheral side of the sheet-like member 3 with a pressurized liquid 7 such as water. The cementitious material composition 9 is injected and solidified on the outer peripheral side of the sheet-like member 3, and the sheet-like member 3 is adhered so that the protrusions on the outer peripheral side of the sheet-like member 3 are embedded in the cementitious material composition 9. The sheet-like member 3 forms a corrosion-resistant inner peripheral surface.
[0003]
[Problems to be solved by the invention]
In the above construction method, the cementitious material composition 9 injected into the outer peripheral side of the sheet-like member 3 can block cracks and the like in the pipe 1, but repairs the concrete pipe laid on the ground. In rehabilitation and the like, there is a case where the reinforcement of the tube wall is necessary, and there is a problem that the reinforcement is not sufficient only by the above-described sheet-like member 3 and the cementitious material composition 9.
[0004]
The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a pipe repair / rehabilitation method for reinforcing a pipe wall while forming a corrosion-resistant inner peripheral surface.
[0005]
[Means for Solving the Problems]
The feature of the present invention for solving the conventional problems as described above and achieving the intended purpose is that a reinforcing steel basket is installed on the inner peripheral side of a concrete pipe, and a large number are provided on the inner peripheral side of the reinforcing steel basket. A cylindrical net member having a communication hole is installed, and a plurality of protrusions that are wider than the communication hole are fixed on the outer peripheral side on the inner peripheral side of the net member. Insert a flexible sheet-like member, fill the inner peripheral side of the sheet-like member with pressurized gas or liquid, and inflate the sheet-like member, and cement the outer peripheral side of the sheet-like member Injecting and solidifying the material composition.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS.
[0007]
In the figure, 11 is a concrete cylindrical conduit, 3 is a cylindrical sheet-like member that forms a corrosion-resistant inner peripheral surface while forming a mold, and 13 is a cylindrical reinforcing bar that reinforces the pipe wall. , 15 is a cylindrical net-like member that is interposed between the sheet-like member 3 and the reinforcing bar basket 13 and facilitates the insertion work of the sheet-like member 3.
[0008]
The sheet-like member 3 is formed flexibly with a synthetic resin material such as high-density polyethylene so that the insertion operation is easy, and in order to improve the adhesive force, as shown in FIGS. A large number of projections (anchors) 5, 5... Are fixed in a staggered manner on the outer peripheral surface of the sheet-like sheet body 4, and the projections 5 are formed in an umbrella shape whose tip portion is wider than the root portion.
[0009]
Further, as shown in FIG. 4, the net-like member 15 is formed of a synthetic resin material, a metal material, or the like so as to have a larger rigidity than the sheet-like member 3 and to hold a cylindrical shape. In FIG. 15, a large number of communication holes 16, 16... Are opened through the front and back so that the cementitious material composition 9 such as mortar can pass through, and the communication holes 16 are formed by the protrusions 5 of the sheet-like member 3. It is formed narrower than the tip of the protrusion 5 so as not to get caught.
[0010]
In order to repair and rehabilitate the pipe line 11 with the sheet-like member 3, the reinforcing bar basket 13, the net-like member 15, etc., first, after deteriorating the deteriorated portion of the inner peripheral surface layer of the pipe line 11, it is shown in FIG. As described above, the reinforcing bar basket 13 is installed at a predetermined position on the inner peripheral side of the conduit 11 via a spacer or the like, and the net-like member 15 is further installed on the inner peripheral side of the reinforcing bar basket 13.
[0011]
Then, as shown in FIG. 2, the sheet-like member 3 is inserted into the inner peripheral side of the net-like member 15 so as to be pulled from the other side while being fed from one side of the pipe line 11 in a folded state. That is, the net-like member 15 is interposed between the reinforcing bar basket 13 and the sheet-like member 3, and the communication holes 16, 16... Of the net-like member 15 are narrow. The plurality of protrusions 5 on the side are smoothly inserted without being caught by the reinforcing bars of the reinforcing bar cage or the communication holes 16 of the net-like member 15.
[0012]
Next, as shown in FIG. 3, the sheet-like member 3 is filled with a pressurized liquid 7 such as water on the inner peripheral side thereof to expand the sheet-like member 3 into a cylindrical shape, and in this state, the outer periphery of the sheet-like member 3 A cementitious material composition 9 such as mortar is injected on the side, and the reinforcing bars 13 and the projections 5, 5... Of the sheet-like member 3 are embedded in the cementitious material composition 9. Then, after the cementitious material composition 9 is solidified, the pressurized liquid 7 is discharged.
[0013]
Thus, by holding the sheet-like member 3 in a cylindrical shape via the pressurized liquid 7, the sheet-like member 3 can be used as an easy-to-install formwork, and the connecting hole 16 of the net-like member 15, Since the sheet-like member 3 can be suitably attached by communicating the cementitious material composition 9 through 16..., The reinforcement of the tube wall by the reinforcing bar basket 13 and the corrosion-resistant inner peripheral surface by the sheet-like member 3. Formation can be performed efficiently.
[0014]
【The invention's effect】
As described above, the pipe repair and rehabilitation method according to the present invention has a large number of communication paths between the reinforcing bar that reinforces the pipe wall and the sheet-like member that forms the mold and forms the corrosion-resistant inner peripheral surface. By inserting a net-like member having a hole and making the communication hole of the net-like member narrower than the protrusion of the sheet-like member, the sheet-like member can be easily inserted and the reinforcing bar cage And the projection of the sheet-like member can be suitably embedded in the cementitious material composition, and the formation of the corrosion-resistant inner peripheral surface and the reinforcement of the tube wall can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first step in an embodiment of a pipeline repair and rehabilitation method according to the present invention.
FIG. 2 is a cross-sectional view showing a second step in the embodiment of the pipe repair and rehabilitation method according to the present invention.
FIG. 3 is a cross-sectional view showing the third step in the embodiment of the pipe repair and rehabilitation method according to the present invention.
4 is a development view of the net-like member in FIG. 3. FIG.
5 is a development view of the sheet-like member in FIG. 3. FIG.
6 is a cross-sectional view taken along line AA in FIG.
FIG. 7 is a cross-sectional view showing an example of a conventional pipeline repair method.
[Explanation of symbols]
3 Sheet-like member 4 Sheet body 5 Projection (anchor)
7 Pressurized liquid (water)
9 Cementitious material composition (mortar)
11 Pipe 13 Reinforcing bar 15 Net-like member 16 Communication hole
