JP2006193939A - Permeable lining member for water collection tunnel, and construction method for water collection tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permeable lining member for a water collection tunnel capable of preventing clogging by soil from occurring in a permeable part during construction. <P>SOLUTION: This permeable lining member as a permeable segment 11 forming the outer shell of the water collection tunnel 10 for taking in underwater 9 from an outer peripheral surface side comprises a porous permeable part 16 exposed to the outer peripheral surface side. A biodegradable or water soluble filler 18 is filled in the holes in the permeable part 16. The permeable segment 11 is manufactured by drying after impregnating the liquefied filler 18 into the permeable part 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a water permeable covering member for a water collecting tunnel that can take in groundwater from the outer peripheral surface side, and a method for constructing a water collecting tunnel using the water permeable covering member.

  2. Description of the Related Art Conventionally, a water collection tunnel 1 constructed to take in and use seawater and groundwater accumulated in the ground (see Patent Documents 1 to 3, etc.).

  As shown in FIG. 9, the water collecting tunnel 1 is a tunnel formed in a cylindrical shape by combining a plurality of arc-shaped water permeable segments 2, and the water permeable segments 2 take in groundwater from the outer peripheral surface side. A portion 2a and water conduits 2b,... For communicating the water permeable portion 2a with the inside of the tunnel are provided.

  The water permeable portion 2a is made of porous porous concrete, and the groundwater on the outer peripheral surface side of the tunnel soaks into the water permeable portion 2a and is taken into the water collecting tunnel 1 through the water conduits 2b,. It is.

  The water permeable segment 2 configured in this manner has a porous structure in which the water permeable portion 2a has a lower strength than normal concrete. Therefore, a reinforcing technique such as arranging a reinforcing plate (not shown) in the water permeable portion 2a. Is disclosed in Patent Document 2 and the like.

  On the other hand, in such a water collection tunnel 1, since groundwater penetrates into the water permeable portion 2a and flows into the tunnel through the water conduit 2b simultaneously with the installation, the end portion of the water conduit 3b as shown in FIG. A lid portion 3c is attached to the main body so that water does not flow into the tunnel during construction.

However, this lid part 3c must be removed at any time, and in order to prevent water from flowing into the tunnel at the same time as the removal, the outer peripheral surface of the water permeable part 3a is covered with a biodegradable sheet 4 as shown in FIG. The covered technique is disclosed in Patent Document 3.
JP 2001-279733 A (FIG. 5, paragraphs 0002 to 0004) JP-A-11-148150 (FIGS. 1, 2, 0002 to 0010) JP 2003-268814 A (FIG. 1, paragraphs 0002 to 0016)

  However, the above-described water collection tunnel 1 is constructed by combining the water permeable segments 2,... Inside the excavation hole excavated by a shield excavator (not shown), and the outer periphery of the water collection tunnel 1 is backfilled with low water permeability. Since it will be covered with a material (not shown), the backfilling material may enter the hole of the water permeable portion 2a and cause clogging.

  In particular, when the water collection tunnel 1 is constructed by a propulsion method in which a water-permeable propulsion pipe (not shown) having a water-permeable portion 2a such as the water-permeable segment 2 is pushed out from the tunnel well into the ground with a hydraulic jack, the water-permeable portion 2a Since the water-permeable propelling pipe moves while the outer peripheral surface of the water and the surrounding ground are in contact with each other, the earth and sand pressed against the porous water-permeable portion 2a are clogged in the hole, causing clogging. May not be secured.

  When constructing a tunnel by such a propulsion method, even when the outer peripheral surface of the water permeable portion 3a is covered with a biodegradable sheet 4 as shown in FIG. 10, when the water permeable segment 3 is pushed into the ground, Since there is a risk of peeling or shifting due to friction, it is difficult to say that clogging can be reliably prevented.

  Furthermore, when constructing a tunnel by the shield method or propulsion method, if the digging reaction force of the digging machine acts on the permeable covering member such as a segment, the permeable lining member has a structure that can withstand this digging reaction force. Need to be reinforced.

  Accordingly, the present invention provides a water permeable covering member for a water collection tunnel in which clogging due to earth and sand does not occur in the water permeable portion during construction, and a digging reaction force of the excavator that does not act on the water permeable covering member. It aims to provide a method for constructing a water tunnel.

  In order to achieve the above object, the invention according to claim 1 is a lining member that forms an outer shell of a water collecting tunnel that takes in groundwater from the outer peripheral surface side, and is a porous member exposed to the outer peripheral surface side. The water-permeable lining member for a water collection tunnel is provided with a water-permeable portion, and a hole of the water-permeable portion is filled with a biodegradable or water-soluble clogging material.

  Further, the water permeable covering member for a water collecting tunnel according to claim 1, wherein the water permeable covering member according to claim 1 is produced by infiltrating the liquid clogging material into the water permeable portion and then drying it. It is characterized by being.

  Further, the invention according to claim 3 is a cutter head for excavating a natural ground and supporting the earth pressure on the front surface, and one end connected to the back surface of the cutter head for driving the cutter head, and the other end is driven. In the construction method of the water collection tunnel which uses the excavator which has the shaft part connected to the part, and the water-permeable covering member for the water collection tunnel according to claim 1 or 2, The cutter head is rotated by operating and rotating the cutter head to excavate a natural ground, and the tip of the tunnel is formed using the water-permeable covering member partly or entirely, the cutter head The tunnel is stretched using the water-permeable covering member behind the tip until the tip reaches a predetermined length by pushing the tip from behind and pushing the tip into the ground. And pulling the cutter head, and fitting the fitting portion provided on the back surface of the cutter head to the annular shielding portion provided along the inner peripheral surface of the tip portion, thereby Shielding and preventing the cutter head from rotating in a direction opposite to that during excavation, and separating the front and rear of the shaft portion by rotating the shaft portion in the direction opposite to that during excavation, and the shaft on the drive unit side It is the construction method of the water collection tunnel which collects a part.

  And the method of Claim 4 builds a shaft from the ground surface around the building toward the ground, and constructs a plurality of water collecting tunnels from the inside of the shaft below the building. It is the construction method of the water collection tunnel described in 1.

  In the invention of claim 1 configured as described above, the pores of the porous water-permeable portion are filled with a biodegradable or water-soluble clogging material in advance.

  For this reason, when placing the water-permeable covering member, earth and sand cannot enter the holes of the water-permeable portion, and after being placed in the ground, the clogging is caused by microorganisms or groundwater existing in the ground. Since the material is decomposed or dissolved, the water collecting function can be exhibited.

  Further, according to the second aspect of the present invention, filling is performed by allowing the clogging material in liquid form to permeate the water permeable portion, and the clogging material filled by drying is prevented from flowing out.

  For this reason, the water-permeable covering member with which the clogging material was filled can be manufactured easily.

  Furthermore, the invention according to claim 3 constructs a water collecting tunnel using an excavator that secures the propulsive force of the cutter head via a shaft portion that rotates the cutter head.

  For this reason, the digging reaction force of the cutter head hardly acts on the water-permeable covering member forming the outer shell of the tunnel, and the water-permeable covering member is configured to have a strength capable of withstanding earth pressure and water pressure. Therefore, the manufacturing cost can be reduced.

  Furthermore, since most of the shaft portion can be recovered after use, it can be reused for construction of other water collecting tunnels, which is economical.

  And the method of Claim 4 construct | assembles a some water collection tunnel from the inside of the vertical shaft constructed | assembled around the building under the said building.

  For this reason, even if a strong earthquake that causes liquefaction of the lower ground of the building occurs, groundwater can flow into the water collection tunnel and suppress the increase in pore water pressure, thus preventing the occurrence of liquefaction. it can.

  Moreover, even after the building is constructed, a water collection tunnel can be constructed as a measure for preventing liquefaction.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG.1 and FIG.2 has shown the perspective view of the water collection tunnel 10 by this Embodiment. Here, FIG. 1 shows a cut perspective view in which a plurality of water collecting tunnels 10,... Are constructed in the underground 13 below the building 12 from the shaft 14 constructed adjacent to the building 12. It is.

  As shown in FIG. 2, the water collecting tunnel 10 is formed in a cylindrical shape by combining a plurality of arc-shaped water permeable segments 11,.

  That is, the water collection tunnel 10 shown in FIG. 2 has a cylindrical shape of unit length constituted by four water permeable segments 11,..., And four cylinders are connected in the extending direction of the water collection tunnel 10. Is. Here, the four seams appearing in the circumferential direction of the cylindrical shape of each unit length are arranged so as to be shifted so as not to be continuous in the extending direction of the water collection tunnel 10.

  Further, the water permeable segment 11 is formed by a water permeable portion 16 made of a porous material such as porous concrete and a frame portion 15 that accommodates the water permeable portion 16. The frame portion 15 is made of, for example, reinforced concrete.

  And the porous concrete of this water permeable part 16 has the structure where the flow velocity which the sand part and fine grain part of a surrounding natural ground do not flow out is obtained.

  The water permeable segment 11 only needs to have a structure that allows the groundwater 9 to permeate from the outer peripheral surface side to the inner peripheral surface side. For example, the water permeable segment 11 is formed in the structure shown in FIG. Here, FIG. 3 shows sectional views of the two types of water-permeable segments 11A and 11B cut along the line AA in FIG.

  Here, in the water permeable segment 11A shown in FIG. 3A, a substantially rectangular parallelepiped or arc-shaped water permeable portion 16A is accommodated in a recess provided in the arc-shaped frame portion 15A, and the water conduit 17a is connected to the water permeable portion 16A. A water passage in the direction of the inner and outer surfaces of the water permeable segment 11A is formed. For this reason, the groundwater 9 which has permeated from the surface of the water permeable portion 16A on the upper side (tunnel outer peripheral surface side) of the figure is discharged to the lower side of the figure (inside the tunnel) through the water conduit 17a.

  The water guide pipe 17a is a cylindrical pipe member, and a plurality of holes (not shown) can be provided on the peripheral surface in contact with the water permeable portion 16A. Moreover, the cover part 17b is attached to the edge part inside the tunnel of the water conduit 17a, and the water leak to the tunnel inside construction is prevented.

  Further, fixing rust preventive reinforcing bars 17c, 17c and the like are projected on the side surface of the water conduit 17a to fix the water conduit 17a to the water permeable segment 11A. Further, in such a water permeable segment 11A, a load is mainly received by the frame portion 15A, and therefore, reinforcing is performed by densely arranging reinforcing bars.

  Moreover, the water permeable segment 11B shown in FIG.3 (b) has the frame part 15B which has the opening part formed in the rectangular parallelepiped shape or the circular arc shape, and the water permeable part 16B formed by placing porous concrete in the opening part. It is comprised by.

  Here, by forming a recess in the inner peripheral surface of the opening of the frame portion 15B, the frame portion 15B and the water permeable portion 16B can be firmly coupled. Further, the frame portion 15B is reinforced by densely arranging reinforcing bars.

  The water permeable segment 11B configured in this way has a water passage route formed by continuously forming the water permeable portion 16B in the inner and outer surface directions, so that the groundwater 9 can pass therethrough.

  Note that the frame portion 15B can be formed by placing concrete with a reinforcing bar around a porous concrete water-permeable portion 16B previously packed with a plugging material 18 described later.

  Innumerable holes constituting the porous portion of the water permeable portion 16 provided in the water permeable segment 11 of the present embodiment are filled with a biodegradable or water-soluble clogging material 18 before being installed in the ground 13.

  This plugging material 18 includes guar gum, β-1,3-glucan, cellulose thickeners such as carboxymethylcellulose (CMC) and water-soluble methylcellulose, polyvinyl alcohol (PVA), starch paste, salt, sugar, starch syrup, Biodegradable or water-soluble materials such as soap are used.

  Such a clogging material 18 is liquefied as shown in FIG. 4, for example, and is filled in the holes of the water permeable portion 16 by immersing the water permeable segment 11 therein. And the clogging material 18 can be fixed to the hole of the water permeable part 16 by drying the water permeable segment 11 pulled up from the liquid.

  Further, depending on the material of the clogging material 18 or the size of the hole of the water permeable portion 16, the clogging material 18 may not sufficiently penetrate through the immersion, so that the liquid clogging material 18 is added from the surface of the water permeable portion 16. It can be filled by pressure filling or by reducing the pressure of the back surface of the water permeable portion 16 to suck the clogging material 18 on the surface.

  For example, when carboxymethyl cellulose is filled as the plugging material 18, the function as the plugging material is lowered by being decomposed by microorganisms existing there after being installed in the underground 13, and the water-soluble carboxymethylcellulose is washed away by the groundwater 9. Therefore, the permeation performance of the water permeable portion 16 can be recovered with the passage of time in the underground 13.

  Moreover, when it is desired to restore the water permeability of the water permeable part 16 at an early stage, a decomposition accelerator such as cellulose-degrading enzyme, cellulase, or novasum is injected into the water permeable part 16 filled with the plugging material 18 to promote the decomposition. You can also.

  FIG. 5 shows an excavating machine 19 used for construction of the water collecting tunnel 10 of the present embodiment. This excavator 19 includes a cutter head 20 for excavating a front ground, a cylindrical hood portion 19 provided to cover the rear thereof, and one end at the back of the cutter head 20 for rotating the cutter head 20. Are provided on the back of the cutter head 20, the shaft 22 having the other end connected to the drive unit 26, the spiral blade 23 formed on the outer periphery of the shaft 22 to discharge excavated soil, and the like. And a fitting portion 25 to which the shaft portion 22 is joined.

  The cutter head 20 is provided with a cutter bit (not shown) for excavation on the front surface of a circular face plate. By rotating the cutter head 20, the front ground is cut and the excavation surface and the excavation surface are excavated. We support so that earth and sand do not collapse.

  Moreover, the hood part 21 is arrange | positioned in the back of the cutter head 20, and the cutter head 20 is connected in the state which can rotate. Furthermore, the inner diameter of the hood portion 21 is formed slightly larger than the outer diameter of the water collection tunnel 10 so that the assembled water collection tunnel 10 can be accommodated therein.

  A frusto-conical fitting portion 25 is provided at the center of the back surface of the cutter head 20, and a screw groove is formed on the peripheral surface thereof. The fitting portion 25 is to be fitted into the central opening 24a of the annular shielding portion 24 (see FIG. 5) provided at the tip portion 10a of the tunnel after the water collecting tunnel 10 is constructed. On the inner peripheral surface, a screw groove that is screwed with a screw groove provided in the fitting portion 25 is formed. These screws are formed so as to be screwed together when the shaft portion 22 is rotated in the direction opposite to the rotation direction during excavation.

  The shaft portion 22 includes a front shaft portion 22a and a rear shaft portion 22b. When the cutter head 20 is prevented from rotating, the shaft portion 22 rotates from the front shaft portion 22a to the rear shaft. It connects by the reverse screw part 22c so that the part 22b may be cut | disconnected (refer FIG. 6).

  Further, the rear shaft portion 22b is extended to a desired length by adding a unit-length member that cannot be rotated with a pin or the like in accordance with the excavation.

  A spiral blade portion 23 is attached to the shaft portion 22, and the earth and sand excavated and taken into the tunnel is conveyed toward the tunnel wellhead by the blade portion 23.

  A portion of the blade portion 23 attached to the front shaft portion 22a is formed in a size that can pass through the central opening portion 24a (see FIG. 5).

  Further, the shaft portion 22 is connected to a drive portion 26 that is a power source for rotation. When the drive portion 26 is operated, the cutter head 20 is rotated by the rotation of the shaft portion 22, and the ground in front is rotated. While being cut, the earth and sand taken into the tunnel is conveyed in the direction of the tunnel wellhead by the rotation of the blade portion 23.

  As shown in FIG. 5, the drive unit 26 is configured to be slidable in the tunnel extending direction along a rail 26b laid on a pedestal 26a.

  Next, the construction method of the water collecting tunnel 10 will be described, and the operation of this embodiment will be described.

  First, as shown in FIG. 1, a shaft 14 is constructed in the underground 13 adjacent to the building 12. And the water collection tunnel 10 is constructed | assembled from the inside of the shaft 14 as shown in FIG.

  The drive unit 26 is installed in the shaft 14, the excavator 19 is assembled, and the drive unit 26 is operated to start the excavator 19 from the shaft 14 toward the underground 13.

  At the time of excavation, an excavating additive is injected from the front surface of the cutter head 20 to excavate the excavated earth and sand by plastic fluidization. Further, a water stop packing 14 a is provided at the periphery of the opening of the shaft 14 from which the excavator 19 is started, and an ejection prevention device (not shown) is provided at the inner opening of the water collecting tunnel 10 so that the inside of the shaft 14 The groundwater 9 and earth and sand are prevented from flowing into the ground. Further, the hood portion 21 prevents the ground near the cutter head 20 from collapsing.

  Further, the tip end portion 10a of the water collecting tunnel 10 is assembled inside the shaft 14 by the water permeable segments 11,..., Pushed out into the ground 13 by the hydraulic jacks 27,.

  And in order to further excavate the natural ground ahead by the excavating machine 19, the shaft part 22 is added inside the shaft 14, and the excavation is continued.

  In order to feed the distal end portion 10a to the excavated hole thus drilled, an extended portion 10b having a length corresponding to the width of the water permeable segment 11 is assembled at the rear end of the distal end portion 10a, and the rear end is added by the hydraulic jacks 27,. The tip 10a and the extending portion 10b are pushed out toward the cutter head 20 by pressing.

  The water collecting tunnel 10 having a predetermined length as shown in FIG. 5 is constructed by repeating the excavation of the excavator 19, the assembly of the extending portion 10b of unit length, and the extrusion by the hydraulic jacks 27,. .

  These operations can be sequentially performed in conjunction with the excavation of the excavator 19, but can also be performed collectively after the excavation of the excavator 19 is advanced to some extent.

  After the water collecting tunnel 10 is constructed, the cutter head 20 is pulled toward the annular shielding portion 24 while rotating the shaft portion 22 in the direction opposite to that during excavation. In this way, the fitting portion 25 that rotates integrally with the cutter head 20 is inserted into the central opening 24 a and screwed into the annular shielding portion 24.

  Further, when the fitting portion 25 is screwed into a predetermined position of the annular shielding portion 24, the rotation is prevented, and the front shaft portion 22a joined to the fitting portion 25 does not further rotate. When the rotation in the same direction is further continued in this state, the rear shaft portion 22b is cut off. At this time, water is stopped by a mechanical check valve inside the front shaft portion 22a.

  And when earth and sand remain in a tunnel, the back shaft part 22b is collect | recovered, rotating the back shaft part 22b in the same direction as the time of excavation, and discharging the earth and sand inside a tunnel.

  FIG. 6 is a view showing a cross section of the front shaft portion 22a recovered from the rear shaft portion 22b and left in the tunnel and the periphery of the tip portion 10a of the water collection tunnel 10.

  As shown in FIG. 6, the front end of the water collection tunnel 10 is blocked by the cutter head 20, the annular shielding part 24 and the fitting part 25.

  As described above, according to the construction method of the water collecting tunnel 10 of the present embodiment, the driving force required for the excavation by the cutter head 20 can be obtained from the shaft portion 22, and therefore the excavation reaction acting on the water permeable segment 11 is performed. The power is small.

  Further, since the water collection tunnel 10 pushed out by the hydraulic jacks 27,... Is pushed out into the excavation hole cut by the cutter head 20, there is almost no obstruction in the traveling direction, and the water collection tunnel 10 is collected with a small propulsive force. The tunnel 10 can be pushed out into the ground 13.

  Thus, since the load which acts on the water-permeable segment 11 during construction can be suppressed to the minimum, it is not necessary to reinforce the water-permeable segment 11 excessively, and the manufacturing cost can be suppressed.

  Furthermore, since the hole of the water permeable part 16 of the water permeable segment 11 is filled with the clogging material 18 in advance, even when the underground 13 is propelled, earth and sand hardly enter the porous hole.

  And since this clogging material 18 is decomposed | disassembled or melt | dissolved by the microbe or groundwater 9 which exists in the underground 13, the permeation | transmission performance recovers with progress of time, and the desired water collection function can be exhibited. Furthermore, when it is desired to restore the water permeability of the water permeable part 16 at an early stage, a decomposition accelerator such as a cellulose degrading enzyme, cellulase, or novasum can be injected.

  Further, the water permeable segment 11 can be easily manufactured by infiltrating the liquid clogging material 18 into the water permeable portion 16 and drying it.

  Furthermore, since the rear shaft portion 22b can be recovered after the water collection tunnel 10 is constructed, it can be reused for construction of other water collection tunnels 10,.

  Then, by constructing a plurality of collecting tunnels 10,... From the inside of the shaft 14 constructed around the building 12 below the building 12, the ground below the building 12 is strong such that the ground is liquefied. Even if an earthquake occurs, the groundwater 9 flows into the water collection tunnel and the increase in pore water pressure can be suppressed, so that the occurrence of liquefaction can be prevented.

  Moreover, since the construction work of the water collection tunnel 10 for preventing such liquefaction can be performed after construction of the building 12, it can be easily applied to the existing building 12.

  Hereinafter, Example 1 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the said embodiment, although the case where the water-permeable segment 11 which made one part the water-permeable part 16 as a water-permeable covering member was used was demonstrated, as shown in FIG. The case where the water-permeable segment 31 in which the whole outer peripheral surface was formed with the water-permeable part is used is demonstrated.

  The water permeable segment 31 is formed in a semicircular shape, and is formed integrally with a semicircular reinforced concrete concrete segment 32 to form a cylindrical water collecting tunnel 30.

  In this way, the upper half of the water collecting tunnel 30 is formed by the water permeable segments 31,... And the lower half is formed by the non-permeable concrete segments 32,. The groundwater 9 can be efficiently transported to a predetermined position without returning to the ground 13 again.

  Thus, since the water permeable part can be arbitrarily provided in a part or the entire circumference of the water collecting tunnel 30, for example, the water permeable segment 11 used in the above-described embodiment can be used only in the upper half part of the tunnel. .

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, Example 2 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the above-described embodiment, the case where a plurality of water collecting tunnels 10,... Are constructed from one shaft 14 has been described. However, in this second embodiment, as shown in FIG. The case where the shafts 42A and 42B are constructed and connected between them by the water collecting tunnel 40 will be described.

  Dams, dams, dikes, etc. have a long extension distance, so if you try to prevent liquefaction by constructing a conventional vertical water collection well on the liquefied ground near such structures, Inefficient because it must be built.

  Therefore, in the second embodiment, a plurality of shafts 42A and 42B are constructed at intervals along the embankment and the like, and the ground water 9 at a desired position is efficiently drained by connecting between them by a horizontal water collecting tunnel 40. Let

  Here, in one shaft 42A, a pumping pump 43 and a drain pipe 44 are installed, and when the water pressure of the groundwater 9 rises due to an earthquake or the like, the groundwater 9 corresponding to the rise is discharged to the collecting tunnel 40. The groundwater 9 should be easily infiltrated.

  In addition, the groundwater 9 can be lowered to a predetermined water level in advance to improve the ground where liquefaction hardly occurs.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment and Example 1, the case where the cylindrical water collecting tunnels 10 and 30 are constructed has been described. However, the present invention is not limited to this, and an arbitrary shape such as an elliptical shape, a rectangular shape, a polygonal shape, etc. A water collecting tunnel having a shape of can be constructed, and a water-permeable lining member having a flat plate shape, an L-shaped cross-sectional view, or a curved surface may be used in accordance with the shape.

  Moreover, in the said embodiment, although the frame part 15 was formed with reinforced concrete, it is not limited to this, A steel frame part can also be formed combining a steel plate, a shape steel, etc.

  Furthermore, in the said embodiment and Example 1, although the outer shell of the water collection tunnels 10 and 30 was formed combining the some segment as a water-permeable covering member, it is not limited to this, A pipe diameter is In the case of being small, a water collecting tunnel can be constructed by using a cylindrical water permeable propulsion pipe having a water permeable portion as a water permeable covering member.

  And if the pipe diameter is up to about 200 mm, the water collecting tunnel 10 can be constructed by directly propelling the water permeable propulsion pipe in the underground 13 without using the excavator 19.

  Moreover, in the said embodiment and Example, although the water collection tunnel 10,30,40 which has arrange | positioned the water-permeable covering member in the full length was demonstrated, it is not limited to this, It is necessary to take in the groundwater 9 It may be a water collecting tunnel in which only a portion of the permeable lining member is disposed, and the other portion may be a non-permeable piping tunnel for transporting the taken-in ground water 9.

  Furthermore, in the said embodiment, although the thread groove was provided in order to make the fitting part 25 and the cyclic | annular shielding part 24 fit by screwing, it is not limited to this, For example, the fitting part 25 is a wharf. It may be formed into a quadrangular pyramid shape or a plate shape, and inserted into the central opening 24a formed in the same shape so as to be fitted to prevent rotation.

  And in the said embodiment, although excavation was performed with the excavation machine 19 provided with the hood part 21, it is not limited to this, The hood part 21 can also be abbreviate | omitted depending on the soil to dig.

  Moreover, in the said embodiment, although the earth and sand excavated by providing the blade | wing part 23 in the outer periphery of the shaft part 22 was carried out, it is not limited to this, It excavated by the belt conveyor etc. without providing the wing | blade part 23. It can also transport earth and sand.

  Moreover, in the said embodiment, although the water permeable part 16 was comprised with the porous concrete, it is not limited to this, For example, if it is a porous member provided with the hole which groundwater 9 can permeate | transmit, with an open cell member etc. There may be.

  Furthermore, in the said embodiment, although the clogging material 18 was made into the liquid state and permeate | transmitted the water permeable part 16, it is not limited to this, The powdery or solid clogging material 18 is the surface of the water permeable part 16 It is also possible to fill the porous holes by rubbing into the pores.

It is a cut perspective view explaining the whole structure of the water collection tunnel of the best embodiment of the present invention. It is a perspective view explaining the structure of the water collection tunnel of the best embodiment of this invention. It is the sectional view on the AA line of Drawing 2, (a) is a sectional view of one example showing composition of a water permeable part which arranged a water guide pipe, and (b) is a water permeable part formed only with porous concrete. It is sectional drawing of the other Example which showed the structure. It is a perspective view explaining the filling method of the clogging material to a water-permeable segment. It is sectional drawing explaining the construction method of the water collection tunnel of the best embodiment of this invention. It is sectional drawing which showed the water collection tunnel of the state which cut | disconnected the rear shaft part. It is a perspective view explaining the structure of the water collection tunnel of Example 1. FIG. It is sectional drawing explaining the structure of the water collection tunnel of Example 2. FIG. It is a perspective view explaining the structure of the conventional water collection tunnel. It is sectional drawing explaining the structure of the water collection tunnel which has arrange | positioned the conventional biodegradable sheet | seat.

Explanation of symbols

9 Groundwater 10 Catchment tunnel 10a Tip part 10b Extension part 11 Permeable segment (permeable lining member)
DESCRIPTION OF SYMBOLS 12 Structure 13 Underground 14 Vertical shaft 16 Water-permeable part 18 Clogging material 19 Excavator 20 Cutter head 22 Shaft part 22a Front shaft part 22b Rear shaft part 24 Annular shielding part 25 Fitting part 26 Drive part 30,40 Catchment tunnel 31 , 41 Permeable segment (permeable lining material)

Claims (4)

  A lining member that forms an outer shell of a water collecting tunnel that takes in groundwater from the outer peripheral surface side, and includes a porous water permeable portion exposed on the outer peripheral surface side, and a hole of the water permeable portion is biodegradable or A water-permeable lining member for a water collection tunnel, which is filled with a water-soluble clogging material.   The water permeable covering member for a water collection tunnel according to claim 1, wherein the clogging material in a liquid state is permeated into the water permeable portion and then dried. A digging having a cutter head for excavating natural ground and supporting the earth pressure on the front surface, and a shaft portion having one end connected to the back surface of the cutter head and the other end connected to a drive unit for rotating the cutter head. In the construction method of the water collection tunnel using the machine and the water-permeable covering member for the water collection tunnel according to claim 1 or 2,
Rotating the cutter head by rotating the shaft portion by operating the drive unit to excavate natural ground,
Form the tip of the tunnel using the water-permeable lining member partly or all around,
While excavating the cutter head, the tip is pushed into the ground by pressurizing the tip from behind,
Build an extended part of the tunnel using the water-permeable lining member behind the tip until it reaches a predetermined length,
By pulling the cutter head and fitting a fitting portion provided on the back surface of the cutter head into an annular shielding portion provided along the inner peripheral surface of the tip portion, the end of the tunnel is shielded and the Prevents the cutter head from rotating in the opposite direction to when digging,
A method for constructing a water collecting tunnel, wherein the shaft part is rotated in a direction opposite to that during excavation to separate the front and rear of the shaft part and collect the shaft part on the drive part side. 4. A water collecting tunnel according to claim 3, wherein a shaft is constructed from the surface around the building toward the ground, and a plurality of water collecting tunnels are constructed from the inside of the shaft below the building. How to build.

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