JP4588232B2 - Installation method of water barrier in shield tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for installing a water blocking wall in a shield tunnel, and in particular, when a heavy rain or flood is temporarily stored in the tunnel during the construction of the shield tunnel, the water blocking wall is easily installed. The present invention relates to a method for installing a water blocking wall in a shield tunnel that can be used.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, when constructing a sewerage work or the like by a shield method, heavy rain or flood during the construction period is sometimes discharged into the tunnel and temporarily stored. In that case, when the shield excavator is submerged, the electrical equipment and wiring section or control section of the shield excavator break down and become unusable. A great deal of money and time is spent on repairing and checking the machine, which increases the construction cost.
[0003]
Furthermore, the use of a shield excavator with waterproofing increases the construction cost, and is a wasteful equipment when water is not stored.
[0004]
In addition, there is also a construction that constructs a water-impervious wall such as a concrete structure that receives water pressure on the front surface of the joint bolt of the joint segment of the tunnel provided with a load receiver of a reinforced concrete structure with a shear block with threaded holes is there. However, this construction method has a problem that the number of processed parts is large and man-hours are required.
[0005]
Therefore, the technology to be solved in order to obtain a method for installing the water blocking wall in the shield tunnel that can easily install or remove the water blocking wall in the tunnel under construction of the shield tunnel and reduce the construction cost. The present invention aims to solve this problem.
[0006]
The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a water blocking wall for temporarily storing rainwater in a tunnel during construction of a shield tunnel composed of segments. In the installation method,
A receiving frame that is adjacent to the inside of the main girder of the segment and protrudes a predetermined length from the main girder into the tunnel is provided, and after the receiving frame is fixed to the main girder, a water blocking wall is provided on the front surface of the receiving frame. How to install a water blocking wall in a shield tunnel
And invention of Claim 2 is,
When installing the water stop wall to said receiving frame, a bolt screwed into the bag nut from該止water wall side with securing the cap nut on the back of the receiving frame, placing the cut-off wall in receiving frame A method for installing a water blocking wall in the shield tunnel according to claim 1 ,
In the invention according to claim 3 , a protrusion is provided on the water stop wall mounting surface side of the receiving frame, and a water stop rubber is fixed to the tip of the protrusion, and the water stop wall facing the protrusion is provided. also disposed waterproofing rubber therein, there is provided a in waterproofing wall installation method to shield tunneling according to claim 1 or 2, wherein Ru is adhered to該止water rubber together by bolting.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view of a steel segment 1, in which arc-shaped main girders 2 and 2 that serve as inter-ring joint plates are arranged at predetermined intervals, and both ends of the main girders 2 and 2 are arranged in a circumferential direction. 1 piece segment 1 is manufactured by connecting longitudinal ribs 4, 4 and 4 at predetermined intervals in the middle part, and attaching an arcuate skin plate to the outer periphery. Has been.
[0008]
Now, as shown in FIGS. 4 and 5, after excavating the natural ground G with a shield excavator (not shown), a plurality of the segments 1, 1. A cylindrical shield tunnel T is constructed by assembling a plurality of in the tunnel axis direction. At that time, water W caused by heavy rain or the like may be temporarily discharged from the wellhead side into the shield tunnel T and stored, and at this time, the water W is arbitrarily selected so as not to flow to the face where the shield excavator is located. Water blocking walls 12a, 12b, and 12c are provided at the locations. The water blocking walls 12a, 12b, and 12c are supported through a receiving frame 5 attached to the segment 1.
[0009]
The receiving frame 5 is made of a steel plate, and the lower portion thereof is cut in advance along the longitudinal ribs 4, 4, 4 on the inner surface of the segment 1 and the inner surfaces of the joint plates 3, 3 at both ends as shown in FIG. The upper part is formed by projecting a predetermined length into the shield tunnel T so as to be a pressure receiving part of the water blocking walls 12a, 12b, 12c, and the lower part is inserted adjacent to the inside of the main girder 2 and then segmented. The bolts 9, 9,... Described later are inserted into the bolt holes 6, 6 ... during fastening between the rings, and the main girder 2 and the receiving frame 5 are fastened. Further, the mounting bolt holes 7, 7... For the water blocking walls 12a, 12b, 12c are opened in the protruding portion at the upper portion of the receiving frame 5. Thereafter, the contact end portion 8 of the lower portion of the receiving frame 5 with the segment 1 is welded to the inner surface of the segment 1 in order to ensure complete water blocking.
[0010]
The receiving frame 5 is sequentially formed into a ring shape together with the assembly of the segments 1, 1... In the circumferential direction, and simultaneously on the circumference as shown in FIG. Installation of the receiving frame ring is completed.
[0011]
Next, a second embodiment will be described with reference to FIG. The receiving frame 10 for attaching the water blocking walls 12a, 12b, 12c is a main girder 2 of the adjacent segments 1, 1 between the segment rings when assembling the other segment 1 to the tunnel axial direction side of the existing segment 1. , Sandwiched between the two. The receiving frame 10 is made of a steel plate, the lower part is adapted to the curvature of the segment 1, and the upper part protrudes a predetermined length into the shield tunnel T so as to be a pressure receiving part of the water blocking walls 12a, 12b, 12c. Form.
[0012]
Further, mounting bolt holes 7, 7... For the water blocking walls 12a, 12b, 12c are opened in the protruding portion at the top of the receiving frame 10. Further, when the receiving frame 10 is sandwiched between the main girders 2 and 2 of the segments 1 and 1, a water swelling type rubber seal (see FIG. .. Are inserted into the bolt holes 6, 6..., Which will be described later, and the main girders 2, 2 and the receiving frame 10 are bolted together with tightening torque. To stop the water. Further, after the bolts of the receiving frame 10 are fastened, the receiving frame 10 may be welded to the inner surfaces of the segments 1 and 1.
[0013]
In addition, the method of clamping the receiving frame 10 between the segments is not limited to the steel segment shown in FIG. Can be used in Although not shown, the main girder of the segment where the water blocking wall is attached may be extended by the height of the pressure receiving portion of the water blocking wall to form a receiving frame.
[0014]
Next, the installation method of the water blocking walls 12a, 12b, and 12c will be described with reference to FIGS. Now, the water blocking walls 12a, 12b, 12c are formed of steel plates and are divided into three parts in order to adjust the weight in consideration of carrying-in to the site, assembly, and the like. First, as shown in FIG. 3A, after fixing the receiving frame 5 to the main girder 2, a waterproof gasket 11 is attached to the entire surface of the receiving frame 5 to which the water blocking walls 12a, 12b, 12c are attached. To do. In the upper part of the receiving frame 5, bolt holes 7, 7... For attaching the water blocking walls 12a, 12b, 12c are opened.
[0015]
Next, as shown in FIG. 3 (b), a water blocking wall 12 c divided on the well opening side of the receiving frame 5 is disposed and fastened to the receiving frame 5 with bolts 13, 13. Further, the upper part fastens a reinforcing member 14 (described later) and the water blocking wall 12c with bolts 15, 15,. Since the water blocking walls 12a, 12b and 12c are divided into three parts as described above, it is necessary to join and reinforce the divided parts. Now, it is assumed that an H-shaped steel material is used as the reinforcing member 14 as shown in FIG. As shown in FIG. 5, the H-shaped steel material 14 has a flange surface mounted on the face plate of the water blocking walls 12a, 12b, 12c on the wellhead side, and is arranged between the receiving frames 5, 5, The water blocking walls 12a, 12b, 12c and the H-shaped steel material 14 are fastened at 15.
[0016]
FIG. 4 is a transverse sectional view of the shield tunnel T showing the installation state of the water blocking walls 12a, 12b, and 12c, and FIG. 5 is a vertical sectional view of the water blocking walls 12a, 12b, and 12c. The receiving frame 5 is formed in a ring shape on the inner surface of the shield tunnel T formed in a cylindrical shape by the segments 1, 1... And the receiving frame 5 and the segments 1, 1. In addition, water blocking walls 12a, 12b, and 12c that are divided in parallel in the vertical direction from the center of the cross section of the shield tunnel T are respectively arranged, and the receiving frame 5 is provided with bolts 13 and divided portions. The bolts 15 are fastened to the H-shaped steel members 14 and 14 to install the water blocking walls 12a, 12b and 12c.
[0017]
Further, a work manhole 18 is provided between the reinforcing member 14 of the lower water blocking wall 12c and the receiving frame 5 in order to cope with an emergency work or an emergency situation. As shown in FIG. 5, the manhole 18 is provided with a circular hole having a predetermined size in the steel plate of the water blocking wall 12c, and a cylinder having a flange portion on the wellhead side is welded to the hole, and the flange portion The steel plate 19 is attached with bolts 20 to form.
[0018]
Since the water blocking walls 12a, 12b, and 12c are installed during the construction of the shield tunnel T, the bolts of the receiving frame 5 and the divided portion must be fastened from the wellhead side. Therefore, the cap nuts 16, 16... Are fixed in advance from one side to the back surface (face side) of the receiving frame 5 at the bolt fastening position and the back surfaces (face side) of the water blocking walls 12a, 12b, 12c of the divided portion. The bolt tightening work is made easy.
[0019]
FIG. 6 (a) is a detailed sectional view of the divided part of the water blocking walls 12b and 12c. As described above, the cap nut 16 is welded to the back side of the water blocking walls 12b and 12c, and the reinforcing material is used. 14, the waterproof rubber packings 17, 17 are sandwiched between the flange portions 14, and the bolts 15, 15 are inserted from the reinforcing material 14 side and screwed into the cap nut 16. Further, a holding steel plate (not shown) may be sandwiched between the water-stopping rubber packings 17 and 17 and the flange portion of the reinforcing member 14 so as to perform bolt fastening evenly.
[0020]
FIG. 6B shows a joint between the receiving frame 5 and the water blocking wall 12c. As described above, the cap nut 16 is fixed to the back surface of the receiving frame 5 and the bolt 13 is inserted from the water blocking wall 12c side. And screwed into the cap nut 16. Therefore, the bolt fastening by the cap nut can be easily done from one side, and the bolt fastening operation can be shortened. The cap nut may be fixed only to the last part to be assembled depending on the situation at the site, and the other part may be bolted with a normal nut.
[0021]
Next, the precast water blocking walls 21a and 21b will be described with reference to FIGS. FIG. 7 is a transverse cross-sectional view of the shield tunnel T showing how the precast water blocking walls 21a and 21b are attached, and FIG. 8 is a vertical cross sectional view of the precast water blocking walls 21a and 21b. The precast water blocking walls 21a and 21b are divided into two parts by horizontally forming a dividing part 22 at the central part of the shield tunnel T. In addition, a reinforcing member 24 is disposed in an arc shape on the outer peripheral portion of the precast water blocking walls 21a and 21b on the receiving frame 5 side, and a reinforcing member 23 is disposed horizontally on the split portion 22 in the central portion. The reinforcing member 24 and the reinforcing member 23 in the horizontal portion are welded and integrated with reinforcing members 25, 25, 25 arranged vertically at predetermined intervals. As shown in FIG. 8, the reinforcing members 23, 24, and 25 are made of, for example, channel steel, and the flange portions are used in the cross-sectional width direction of the precast water blocking walls 21a and 21b.
[0022]
Further, a double steel plate system is adopted in which steel plates 34, 34 are welded to both outer surfaces in the width direction of the reinforcing members 23, 24, 25 to have an inner space. Further, handles 36, 36... Are welded to places on one side of the outer steel plate 34 of the reinforcing members 25, 25. Furthermore, a manhole 31 is provided between the reinforcing members 25 of the lower water blocking wall 21b. In the manhole 31, the steel plates 34, 34 are formed in a cylindrical shape with a predetermined size on the face side and the wellhead side, flange portions are formed at the tip portions, and lid plates 32, 33 are formed at the flange portions, respectively. Is completed by bolt fastening.
[0023]
Next, a water stopping method between the precast water blocking walls 21a and 21b, the dividing portion 22 and the receiving frame 5, and the precast water blocking walls 21a and 21b will be described. First, as shown in FIG. 9, an inverted U-shaped groove 26 is provided in the steel plate 34 on the receiving frame 5 side so that the opening is directed to the receiving frame 5 side. The groove 26 is formed of a steel plate in a direction along the back surface of the web of the reinforcing member 24 and a steel plate arranged in parallel with the steel plate 34, and a waterproof rubber 27 is embedded therein. On the other hand, a protrusion 28 is provided on the mounting surface side of the precast water blocking wall of the receiving frame 5 facing the groove 26, and a water blocking rubber is fixed to the tip of the protrusion 28. A bolt 29 is protruded from the inside of the steel plate 34 near the upper portion of the groove 26, and the head of the bolt 29 is fixed to the steel plate 34 in advance.
[0024]
As shown in FIG. 8, the groove 26 is provided horizontally along the reinforcing members 23, 23 of the divided portion 22, and the waterproof rubber 27, 27 is embedded therein. The bolts 29 and 29 are also fixed in advance to the steel plate 34 in the vicinity of the groove 26 as described above. The bolts 29, 29... Are inserted into the bolt holes 7 of the receiving frame 5, and the protrusions 28 are inserted into the water blocking rubber 27 in the grooves 26, and the nuts 30 are inserted from the back of the receiving frame 5. And the precast water blocking wall 21b is installed on the receiving frame 5. Further, a splicing steel plate 35 is disposed on the groove 26 side in the vicinity of the divided portion 22, and the steel plate 34 and the splicing steel plate 35 are fastened by the bolt 29 and the nut 30.
[0025]
Therefore, as shown in FIG. 10, when the precast water blocking wall 21 b is installed on the receiving frame 5, the water blocking rubbers fixed to the distal ends of the water blocking rubber 27 and the protrusions 28 are connected to each other. The bolt 29 and the nut 30 are brought into close contact with each other, and a highly reliable water stop performance is obtained. Further, since the bolts 29, 29... Are fixed to the steel plate 34 in advance, one side installation from the wellhead side of the precast water blocking walls 21a, 21b can be easily performed.
[0026]
Next, the water stop doors 50, 55, and 63 will be described with reference to FIGS. FIG. 11A is a transverse cross-sectional view of the shield tunnel T showing the installation state of the open / close type water stop doors 50, 50, and a shear steel wheel 53 as a construction vehicle, a worker, etc. in the center of the shield tunnel T. Is provided with a rectangular opening O. In the cross section of the tunnel other than the opening O, partition walls 40, 40... Made of steel plates are fixedly provided on the entire circumference of the segment 1. Further, reinforcing steel materials 42a and 42b made of H-shaped steel material are installed horizontally on the back surface of the partition walls 40, 40 along the upper and lower sides of the opening O, and are fixed to the segment 1. Further, reinforcing steel members 41b and 41b made of H-shaped steel material are erected vertically along the opening portion O on the rear surfaces of the left and right partition walls 40 and 40 of the opening portion O, and are fixed to the reinforcing steel materials 42a and 42b. . Further, reinforcing steel members 41c, 41c made of H-shaped steel material are arranged on the vertical upper extension of the reinforcing steel materials 41b, 41b, and reinforcing steel materials 41a, 41a made of H-shaped steel material are also arranged on the vertical lower extension, The reinforcing steel members 42b and 42a and the segment 1 are fixed.
[0027]
In addition, a joint pipe 43 for jointing a ventilation pipe is previously welded to the steel plate of the partition wall 40 between the upper portion of the opening O and the segment 1, and the ventilation pipe is connected to the steel plate before and after the partition wall 40. Enable joints. Also, between the left side of the opening O and the segment 1, joint pipes 45, 45 for jointing a water supply pipe, a backfill injection pipe A, a backfill injection pipe B, a mud pipe and a water distribution pipe from above. Are welded to the steel plate so that the pipes can be jointed from the front and rear of the partition wall 40. Further, a cable pipe 44 through which a high-voltage cable, a low-voltage cable, a communication cable, and an instrument cable are inserted is welded to the steel plate between the right side of the opening O and the segment 1.
[0028]
The joint pipes 43, 45... And the cable pipe 44 are protruded from the partition wall 40 in the front-rear direction by a predetermined length and welded to the steel plate. The inside of the cable pipe 44 through which each cable is inserted is cement-based. Thicken with materials and plaster to completely close the gap in the tube. Further, rails 46 and 46 on which a shear steel wheel 53 or the like travels are laid at predetermined intervals on the reinforcing steel material 42a below the opening O. The rails 46 and 46 have a structure that can be easily removed so as not to obstruct the opening and closing of the water stop door 50 described later. Further, a steel scaffolding plate 47 serving as a worker passage is laid on the right side of the reinforcing steel material 42a, and a handrail column 48 is erected on the rail side of the steel scaffolding plate 47 so that the worker passage, the construction vehicle, Safety compartment.
[0029]
Next, joint portions 51, 51... Are attached to the left and right partition walls 40 on the well opening side of the opening O to attach open / close-type water stop doors 50, 50. The joint portions 51, 51... Are provided at three positions at equal intervals on the left and right sides to support the water stop doors 50, 50 and to be connected to the water stop doors 50, 50 with vertical pins (not shown). As shown in FIG. 11B, it is formed so that it can be rotated horizontally. Further, a waterproof rubber seal 52 is attached to the entire periphery of the opening O on the side where the waterproof doors 50, 50 are attached. Furthermore, the front end portions 50a and 50b of the water stop doors 50 and 50 are formed in an uneven shape so that they can be fitted at the center of the opening O when closed, and a water stop rubber (not shown) is formed in one recess. Stick and stop the water.
[0030]
Accordingly, the water stop doors 50 and 50 are opened as shown in FIG. 11 (b) during normal construction to allow construction vehicles and the like to pass through and temporarily enter the shield tunnel T due to heavy rain or the like. When water W is stored, the water stop doors 50 and 50 are closed. Reference numeral 49 in the figure denotes a ladder for upper work such as connection of a ventilation pipe.
[0031]
Next, FIG. 12A is a cross-sectional view of the shield tunnel T showing the installation state of a rectangular water stop door 55 that can be attached to and detached from the partition walls 40 around the opening O, and FIG. ) Shows a cross-sectional view of the hoe of FIG. The method of forming the partition walls 40, 40... And the reinforcing steel materials 41a, 41b, 41c, 42a, 42b is the same as that shown in FIG. The joint pipes 43, 45... And the cable pipe 44 are installed in the same positions as those described above, and the description thereof will be omitted.
[0032]
Bolt holes are opened at equal intervals around the entire circumference of the partition wall 40 in the vicinity of the opening O, and the opening O is closed by the water stop door 55 and at the same position on the outer periphery of the water stop door 55. Bolts 56, 56... Are inserted into the drilled bolt holes to fasten the water stop door 55 to the partition wall 40. During normal construction, the water stop door 55 is removed to allow construction vehicles and the like to pass.
[0033]
The water stop door 55 is installed in such a manner that a transport carriage 57 having the water stop door 55 mounted horizontally is positioned at the opening O, and then lifted vertically by a chain block 58 provided in the upper segment 1. After the lower part of the water stop door 55 is placed on the positioning guard plate 54, the water stop door 55 is bolted to the partition walls 40, 40.
[0034]
Next, another water stop door 63 will be described with reference to FIG. 13A shows a cross-sectional view of the shield tunnel T, and FIG. 13B shows a vertical cross-sectional view of the shield tunnel T. The opening O is formed to have a size that allows the steel wheels 64, 64 to pass through double lines, and the partition walls 61, 61... Are fastened with bolts to a ring-shaped receiving frame 60 fixed to the segment 1. In addition, one of hinge portions 62, 62, 62 that can rotate the water stop door 63 in the vertical direction is fixed to the partition wall 61 on the upper side of the opening O, and the other is connected to the water stop. Secure to the door 63. The illustrated hinge portions 62, 62, 62 are provided at three positions at equal intervals in the horizontal direction to support the water stop door 63.
[0035]
At the time of normal construction, as shown in FIG. 13 (b), the lower part of the water stop door 63 is rotated by the hinges 62, 62, 62 with a chain block 58 provided in the upper segment 1, and then suspended. When the water stop door 63 is used, the chain block 58 is lowered so that the water stop door 63 is applied to the entire circumference of the opening O of the partition walls 60, 60. Close contact. It should be noted that the sleepers 59, 59... And the rails 46, 46.
[0036]
Thus, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.
[0037]
【The invention's effect】
As described above, the invention according to claim 1 is provided with a water stop wall in the receiving frame that is adjacent to the inside of the main girder of the segment and protrudes from the main girder into the tunnel. The water blocking wall can be easily installed at any position in the tunnel, and can be easily removed and diverted to other positions.
[0039]
In addition to the effect of the invention of the first aspect, the invention according to claim 2 has a cap nut fixed to the back surface of the receiving frame, and a bolt is screwed into the cap nut from the water blocking wall side. Since the water blocking wall is installed, the bolt fastening operation can be shortened and the water blocking wall can be easily installed on one side of the receiving frame.
[0040]
In addition to the effect of the invention described in claim 1 or 2, the invention described in claim 3 is provided with a protrusion on the receiving frame, a waterproof rubber is fixed to the tip of the receiving frame, and a water blocking wall facing the protrusion is provided. Since the water-stopping rubber is also disposed inside and the water-stopping rubbers are brought into close contact with each other by bolt fastening, the water-stopping between the receiving frame and the water-stopping wall is surely performed.
[0042]
Thus, it is an invention that has various remarkable effects, such as being able to install a water blocking wall easily and efficiently during construction of a shield tunnel and reducing the construction cost. is there.
[Brief description of the drawings]
FIG. 1 is a perspective view of a segment showing an embodiment of the present invention and having a receiving frame attached to a main beam of the segment.
FIG. 2 is a perspective view of a segment in which a receiving frame is attached between the segments.
FIG. 3A is a perspective view of a segment showing a state in which a water-stopping rubber packing is attached to a receiving frame.
(B) The perspective view which shows the installation state of a water stop wall.
(C) The perspective view which shows the installation state of the reinforcing material of a division part.
FIG. 4 is a cross-sectional view of a shield tunnel showing an installation state of a water blocking wall.
5 is a cross-sectional view taken along the line II in FIG. 4;
6A is a detailed view of a portion B in FIG. 5;
(B) C detailed view of FIG.
FIG. 7 is a cross-sectional view of a shield tunnel showing the installation state of a precast water blocking wall.
8 is a sectional view of the knee of FIG.
FIG. 9 is a partially cutaway longitudinal sectional view showing a state before the precast water blocking wall is installed.
FIG. 10 is a partially cutaway longitudinal sectional view showing a completed state of the precast water blocking wall.
FIG. 11 (a) is a cross-sectional view of the shield tunnel showing the installation state of the water stop door.
(B) The top view which shows the open state of a water stop door.
FIG. 12A is a transverse cross-sectional view of a shield tunnel showing an installation state of another water stop door.
(B) The ho-ho sectional view of FIG.
FIG. 13A is a cross-sectional view of a shield tunnel showing a state where still another water stop door is installed.
(B) The longitudinal cross-sectional view of the shield tunnel which shows the installation state of a water stop door.
[Explanation of symbols]
1 Segment 2 Main girder 5, 10 Receiving frame 12a, 12b, 12c Water blocking wall 13, 15 Bolt 16 Cap nut 21a, 21b, 21c Precast water blocking wall 27 Water blocking rubber 28 Projection 29 Bolt 40, 61 Partition 50, 55, 63 Water stop door O Opening T Shield tunnel W Water

Claims (3)

In the method of installing a water blocking wall to temporarily store rainwater in the tunnel under construction of a shield tunnel composed of segments,
A receiving frame that is adjacent to the inside of the main girder of the segment and protrudes a predetermined length from the main girder into the tunnel is provided, and after the receiving frame is fixed to the main girder, a water blocking wall is provided on the front surface of the receiving frame. A method of installing a water blocking wall in a shield tunnel characterized by installing When installing the water stop wall to said receiving frame, a bolt screwed into the bag nut from該止water wall side with securing the cap nut on the back of the receiving frame, placing the cut-off wall in receiving frame The method for installing a water blocking wall in a shield tunnel according to claim 1 . A protrusion is provided on the water stop wall mounting surface side of the receiving frame, and a water stop rubber is fixed to the tip of the support frame , and a water stop rubber is also disposed inside the water stop wall facing the protrusion. , according to claim 1 or 2 shield tunnel in waterproofing wall installation method of wherein Rukoto brought into close contact with該止water rubber together by bolting.

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