JP5147985B2 - Structure of contact part between underground structural member and earth retaining wall - Google Patents

Description

  The present invention relates to an abutment structure between an underground structural member and a retaining water barrier, and mainly a segment installed in the ground as a tunnel lining material and a retaining water wall constructed in contact with the segment. It is applied to the contact part.

  After excavating the tunnel in parallel, when constructing an underground structure by widening the opposite inner side, a retaining wall is constructed between the tunnels by a freezing method, and the inner side is excavated to have an arbitrary cross-sectional shape. A construction method of an underground structure for constructing an underground space is known.

  For example, as shown in FIG. 11A, after the shield holes 20 and 20 are dug in parallel by the shield method, the earth retaining water wall 21 made of frozen soil is constructed in an arch shape between the shield holes 20 and 20. A construction method for an underground structure is known in which the widened portion 22 that is continuous with the shield hole 20 is constructed by excavating the inside thereof (see Patent Document 1).

  In this type of construction method, a large earth pressure and water pressure act from the outside of the above-mentioned earth retaining wall 21 during construction, and this earth pressure and water pressure are applied to the lining material (segment) of the shield hole 20 and the earth retaining wall. It acts as a large axial force and shearing force on the contact portion (a) with the water wall 21.

  The design of the abutting portion (a) is carried out on the assumption that the frosting (shearing) force against the segment of the earth retaining wall (21) resists mainly the shearing force acting on the abutting portion (i). The (shear) force was not sufficient as a shear resistance force, and was theoretically unclear.

  In addition, there are many cases where grease or a backfilling material adheres to the segments, and there is a possibility that the freezing force may be further reduced due to the existence of ice itself in which the water in the voids is frozen.

  Therefore, for example, as shown in FIG. 11B, the applicant projects a shearing force transmission member 24 made of a steel bar or the like at the contact portion a between the segment 23 and the retaining water retaining wall 21. Although the method was developed, the shear force transmission member 24 protrudes by penetrating the segment 23 from the inside of the segment 23 and press-fitting into the end 21 a of the earth retaining water wall 21.

JP-A-4-281990 JP 2004-156379 A

  However, since a large earth pressure and water pressure are constantly acting on the contact portion A, there is a problem that the shear force transmitting member 24 cannot be smoothly press-fitted into the earth retaining water wall 21 side. In addition, a special press-fitting device is required to press-in the shear force resistance member 24 by pushing a large earth pressure and water pressure.

  In addition, it may be pushed back due to a press-fitting device failure or work mistake. If pushed back, high-pressure groundwater may flow into the tunnel along with earth and sand, causing a catastrophe, which is a problem in construction safety. was there.

  The present invention has been made to solve the above-described problems, and a shearing force transmission member is provided from the underground structural member side to the retaining water blocking wall side at the contact portion between the underground structural member and the retaining water blocking wall. It is an object of the present invention to provide a contact portion structure between an underground structural member and an earth retaining water wall that can be smoothly and safely press-fitted and protruded.

  The contact portion structure between the underground structural member and the retaining water retaining wall according to claim 1 includes a shield hole having a segment having a main girder, a joint plate, and a vertical rib as a covering material, and a segment of the shield hole. An underground structure constructed by projecting a shearing force transmission member through the segment from the inside of the shield hole and projecting into the earth retaining water wall at a contact portion with the earth retaining water wall constructed in contact In the contact portion structure between the member and the earth retaining water wall, the shear force transmitting member is formed of a threaded bolt, and is attached to a screw hole of an attachment hardware fixed to the main girder, joint plate or vertical rib of the segment. It is characterized by being attached by screwing.

  In the present invention, a shear force transmitting member is attached from the inside of the shield hole to a contact portion between a shield hole having a segment as a lining material and an earth retaining water wall constructed in contact with the segment of the shield hole. When penetrating and projecting into the earth retaining water wall, a shearing force transmitting member is formed from a threaded bolt and screwed into a screw hole of an attachment hardware welded to the main girder, joint plate or vertical rib of the segment. By attaching them together, the shearing force transmitting member can be projected smoothly and safely without being pushed back by earth pressure or water pressure into the earth retaining water wall from the inside of the segment. In addition, workability is facilitated by press-fitting while rotating the shearing force transmission member using a wrench or the like.

  As the shearing force transmission member, for example, a threaded bolt, specifically, a hexagon head bolt or a hexagon socket head bolt can be used, and its diameter, length, quantity, pitch, etc. are arbitrary according to design conditions. Can be set to In addition, since conventional screws such as hexagon head bolts and hexagon socket head bolts can be used as threaded bolts, it is extremely economical and can be easily press-fitted using a wrench or the like.

  Furthermore, by forming the tip of the shear force transmission member into a conical shape or a pyramid shape, the shear force transmission member can be smoothly press-fitted into a hard earth retaining water wall and protruded. The segment can be a steel segment, an RC segment, a PC segment, or the like.

  The contact portion structure between the underground structural member and the earth retaining water wall according to claim 2 is the contact portion structure between the underground structure member and the earth retaining water wall according to claim 1, wherein the mounting hardware is: It is formed from a threaded sleeve or a long nut having a screw hole on the inner periphery.

  The contact portion structure between the underground structural member according to claim 3 and the earth retaining water wall is the contact portion structure between the underground structure member and earth retaining water wall according to claim 1 or 2, A fixed hardware for fixing the shearing force transmitting member is attached to the inside.

  In the present invention, when the shear force transmission member is press-fitted into the end portion of the earth retaining water wall, the fixed hardware is used as a reaction force receiver against the earth pressure or the water pressure, so that the shear force transmission member is It is possible to press-fit smoothly and safely without being pushed back to the end by earth pressure or water pressure, and to firmly fix the shearing force transmission member after press-fitting so that it is not pushed back by a fixed hardware. .

  In this case, the shape and structure of the fixed hardware are not particularly limited as long as the shear force transmitting member has a strength and a structure that is not pushed back by earth pressure or water pressure.

  The contact portion structure between the underground structural member and the earth retaining water wall according to claim 4 is the contact portion between the underground structure member and the earth retaining water wall according to claim 1. In the structure, the mounting hardware has a screw hole on the front end side and a through hole communicating with the screw hole on the rear end side, and one or more water-stopping materials are attached to the flat portion of the through hole in a ring shape. It is characterized by. The water-stopping material in this case is not limited as long as the water-stopping between the shearing force transmitting member and the threaded sleeve can be ensured, but a water-swellable water-stopping material is preferable.

  The contact portion structure between the underground structural member according to claim 5 and the earth retaining water wall is the contact portion structure between the underground structure member and earth retaining water stop wall according to claim 4, A plurality of shear force transmission members are attached in the axial direction.

  According to the present invention, a male screw part formed on a shear force transmitting member is attached to the underground structural member at a contact portion between the underground structural member and the earth retaining water wall. Since it is screwed into the screw hole and protrudes from the inside of the underground structural member into the earth retaining water wall, the shear force transmitting member is inserted into the earth retaining water wall from the inside of the segment. Thus, it is possible to project smoothly and safely without being pushed back.

  Further, since the shear force transmitting member can be press-fitted while being rotated using a wrench or the like, the workability is good, and further, conventional parts such as threaded bolts can be used for the shear force transmitting member. Therefore, it has an effect such as being economical.

The underground structure which consists of a shield hole and a earth retaining water stop wall is shown, (a) is sectional drawing which shows the whole, (b) is a top view of a segment. It is an expanded sectional view of the contact part a of the earth retaining water stop wall and segment in FIG. It is sectional drawing which shows the structure of the attaching part of a dowel. It is sectional drawing which shows the structure of the attaching part of a dowel. It is sectional drawing which shows the structure of the attaching part of a dowel. It is sectional drawing which shows the structure of the attaching part of a dowel. (A), (b) is sectional drawing which shows the structure of the attaching part of a dowel. (A), (b) is sectional drawing which shows the structure of the attaching part of a dowel. It is sectional drawing which shows the structure of the attaching part of a dowel. (A), (b) is an expanded sectional view in FIG. 9 which shows the structure of the attachment part of a water stop material. (A) is sectional drawing which shows the whole underground structure which consists of a shield hole and a earth retaining water wall, (b) shows the structure of the contact part of the conventional earth retaining water wall and a segment (a FIG.

  1 to 3 show the structure of the abutting portion between the steel segment and the earth retaining water wall as an embodiment of the abutting portion structure between the underground structural member and the earth retaining water wall according to the present invention. It is shown.

  In the figure, two shield holes 1 and 1 are dug in parallel, and the earth retaining water stop wall 2 is constructed in an arch shape on the upper side and the lower side between the shield holes 1 and 1. The ground of the shield holes 1 and 1 is covered with a steel segment 3.

  Further, the earth retaining water wall 2 is predetermined by laying a freezing pipe 4 in an arch shape in the ground between the shield holes 1 and 1 and circulating a refrigerant in the freezing pipe 4 to freeze the ground around the pipe. Built to a thickness of. Both end portions 2 a and 2 a of the earth retaining water stop wall 2 are in contact with the outer peripheral surface of the steel segment 3.

  A plurality of shearing force transmission members (hereinafter referred to as “divel”) 5 are provided from the steel segment 3 side to the earth retaining water stop wall 2 at the contact portion a between the end 2a of the earth retaining water stop 2 and the steel segment 3. Projected on the side.

  The steel segment 3 has a predetermined thickness of filled concrete 3e (hereinafter referred to as "concrete layer 3e") made of mortar or concrete inside the segment body consisting of the main beam 3a, joint plate 3b, vertical rib 3c and skin plate 3d. It is comprised by filling.

  A plurality of gibber mounting hardware 6 (hereinafter referred to as “mounting hardware 6”) for mounting the diver 5 is embedded in the concrete layer 3e.

  A threaded sleeve having a screw hole on the inner periphery is used for the mounting hardware 6, and the mounting hardware 6 is attached to the main girder 3 a, the joint plate 3 b, and the vertical rib 3 c, respectively. The vertical ribs 3c are embedded at predetermined intervals in the longitudinal direction. Each attachment metal 6 is fixed to the segment body by welding to the main beam 3a, the joint plate 3b or the vertical rib 3c and the skin plate 3d.

  Threaded bolts are used for the dowel 5, and the dowel 5 is attached to the screw hole of the attachment hardware 6 by screwing from the inside to the outside of the segment 3. The male screw portion 5a of the gibber 5 passes through the screw hole of the attachment metal 6 and the skin plate 3d of the segment main body, and the tip portion 5b projects into the end portion 2a of the earth retaining water stop wall 2 by a predetermined length.

  A water stop nut 7 is screwed into the male screw portion 5 a of the gibber 5. Further, a reinforcing washer 8 is concentrically embedded in the concrete layer 3e outside the fitting 6 and a water stop material 9a made of rubber or the like is attached to the end of the fitting 6 and the reinforcing washer 8. .

  And the water stop nut 7 is fastened so that the water stop material 9 may be strongly compressed from above. Further, a water-stopping material 9 b is filled between the male screw portion 5 a of the diver 5 and the female screw portion of the water-stop nut 7, and further, a water-stop material 9 c is provided between the bolt head 5 c and the water-stop nut 7. Intervened.

  In such a configuration, due to the shearing force at the abutting portion a between the both ends 2a, 2a of the earth retaining water stop wall 2 and the steel segment 3 (skin plate 3d), the resistance force of the frozen soil against the diver 5 resist.

  Further, the peeling force at the contact portion a is resisted by a pull-out resistance force (fixing force) to the earth retaining water stop wall (frozen soil) 2 of the dowel 5.

  In this case, the necessary frosting (shearing) force and frosting resistance can be obtained by appropriately setting the length, diameter, pitch, number, and the like of the dowels 5.

  FIG. 4 shows another embodiment of the present invention. In FIG. 3, a gibber fixing bracket 10 (hereinafter referred to as “fixed hardware 10”) for fixing the diver 5 is attached to the inside of the segment body.

  The fixed hardware 10 is formed in a U-shaped or hat-shaped shape that opens to the skin plate 3d side of the segment main body, and a through hole 10b through which the male screw portion 5a of the dowel 5 passes is formed in the web portion 10a. The through hole 10 b corresponds to the screw hole of the mounting hardware 6.

  The fixed hardware 10 formed in this way is attached to the main girder 3a, joint plate 3b or vertical rib 3c of the segment body together with the mounting hardware 6, and predetermined in the longitudinal direction of the main girder 3a, joint plate 3b and vertical rib 3c. Several are installed at intervals. And it is attached by welding to the main girder 3a, the joint plate 3b or the vertical rib 3c and the skin plate 3d, respectively.

  The bevel 5 passes through the through hole 10b of the web portion 10a of the fixed hardware 10, is screwed into the screw hole of the mounting metal 6, and passes through the skin plate 3d of the segment body. And the front-end | tip part 5b of the dowel 5 protrudes to the outer side of the skin plate 3d, and protrudes in the edge part 2a of the earth retaining water stop wall 2 for a predetermined length.

  A loosening prevention nut 11 is screwed into the male screw portion 5a of the gibber 5. The loosening prevention nut 11 is tightened so as to strongly press the inside of the web 10 a of the fixed hardware 10.

  By being configured in this way, when the dowel 5 is press-fitted into the end 2a of the retaining water stop wall 2, the fixed hardware 6 is used as a reaction force receiver against earth pressure or water pressure acting on the contact portion A. The bevel 5 can be easily press-fitted into the earth retaining water wall 3 side. Further, after the press-fitting, the diver 5 can be firmly fixed so as not to be pushed back by earth pressure or water pressure.

  FIGS. 5 to 9 also show other embodiments of the present invention. FIG. 5 shows a particularly simplified structure. In the example of FIG. The bolt head 5c is strongly compressed to achieve water-stopping between the male screw portion 5a of the gibber 5 and the mounting hardware 6. Other configurations are substantially the same as those of the embodiment described with reference to FIG.

  FIG. 6 is an example in which the water stoppage between the gibber 5 and the mounting hardware 6 is particularly improved. In the embodiment described in the example of FIG. 5, the end of the mounting hardware 6 (inside the segment 3) A storage recess 12 having an inner diameter larger than the outer diameter is formed, a water stop material 9a made of rubber or the like is attached in the storage recess 12, and the bolt head of the dowel 5 after being press-fitted into the earth retaining water stop wall 2 side. The part 5c is accommodated. In this case, it is desirable that the bolt head 5c of the dowel 5 has a hexagonal hole.

  7 (a) and 7 (b) show a particularly improved water-stopping property between the dowel 5 and the mounting hardware 6. In the embodiment described in the example of FIG. A filling recess 13 having an inner diameter larger than the outer diameter of the fitting 6 is formed on the outer side, and the filling recess 13 is filled with a water stop agent 9d. In this way, the water stoppage between the bevel 5 and the mounting hardware 6 is enhanced.

  7A shows a type in which after the segment 3 is assembled, the filling recess 13 is filled with a viscous water stop material 9d, and the water stop material 9d is embedded in the concrete layer 3e near the fitting 6. The water-stopping material 9d may be filled either before or after press-fitting the diver 5 into the earth retaining water-stop wall 3 side.

  FIG. 7B shows that the recess 13 is pre-filled with the water stop material 9d before assembling the segment 3, and after the segment 3 is assembled, the gibber 5 is press-fitted so as to break through the filler 9d to the earth retaining water stop wall 3 side. In any type, the periphery of the male screw portion 5a is sealed in the filling recess 13 by the water-stopping material 9d, so that the water-stopping property between the dowel 5 and the mounting hardware 6 is enhanced.

  8 (a) and 8 (b) are designed to increase the water stoppage between the gibber 5 and the mounting hardware 6 by a particularly simple method, and FIG. 8 (a) is the embodiment described with reference to FIG. A water-stopping agent 9e is filled between the male screw portion 5a of the diver 5 and the screw hole of the mounting bracket 6.

  Further, FIG. 8 (b) shows that in the embodiment described with reference to FIG. 5, the water stop agent 9e is filled around the male screw portion 5a of the mounting bell 6 at the front end side portion of the mounting bracket 6. The water stoppage between the mounting hardware 6 is enhanced.

  The water-stopping material 9e is injected from the inside of the segment 3 through a tube 14 embedded in the concrete layer 3e near the fitting 6 and the water-stopping material 9e is filled with the earth 5 This is performed after being pressed into the retaining water wall 3 side.

  9 (a) and 9 (b) show a further simplification of the water-stopping structure, in which a screw hole is formed only in a certain range on the front end side as the mounting hardware 6, and the rear end side portion is formed as a through hole. The water stop material 15 is attached to the smooth part of the through-hole in the shape of a ring. Moreover, the half screw bolt in which the external thread part 5a was formed only in the fixed range by the side of the front end is used for the jivel 5. FIG.

  Further, the water stoppage between the dowel 5 and the mounting hardware 6 is achieved by a waterstop member 15. As shown in FIGS. 10A and 10B, one water stop material 15 or a plurality of water stop materials 15 may be attached at predetermined intervals in the axial direction of the dowel 5. Moreover, the water stop material 15 may be attached to the shaft portion on the side of the dowel 5.

  Next, the construction procedure will be briefly described based on the embodiment of FIG. 4. First, the shield holes 1 and 1 are dug in parallel. Next, the freezing tube 4 is inserted in an arch shape from one shield hole 1 side to the other shield hole 1 side.

  Then, the refrigerant is circulated through the freezing tube 4 to freeze the ground around the freezing tube 4 over a certain range. Thus, it is possible to construct the earth retaining wall 2 that continues in an arch shape between the shield holes 1 and 1.

  In this case, both end portions 2a, 2a of the retaining water retaining wall 2 are brought into contact with the surface of the skin plate 3d of the steel segment 3 installed as a covering material for the shield holes 1, 1.

  Further, the gibber 5 is screwed into the fitting 6 and press-fitted from the inside of the steel segment 3 to the earth retaining water wall 2 side. And the front-end | tip part 5b of the dowel 5 is penetrated in the outer side of the skin plate 3d of the steel segments 3, and it press-fits into the edge part 2a of the earth retaining water stop wall 2. FIG. Then, the bevel 5 is fixed to the steel segment 3 by welding or the like so as not to be pushed back by earth pressure or water pressure.

  Further, the gibber 5 is attached to the segment 3 in advance when the shield holes 1 and 1 are dug (however, the tip of the gibber 5 is attached so that it does not protrude from the surface of the skin plate 3d). , 1 After digging, build frozen soil (earth retaining wall 2). In short, the Giber 5 is pushed into the ground before freezing the ground.

  According to the present invention, a shear force transmitting member is smoothly and safely press-fitted from the underground structural member side to the earth retaining water wall side at the contact portion between the underground structural member and the earth retaining water wall and protrudes. Can do.

1 Shield hole 2 Earth retaining wall 3 Segment (underground structural member)
4 Freezing tube 5 Giber (shear force transmission member)
6 Mounting hardware (Givel mounting hardware)
7 Water stop nut 8 Reinforced washer 9a Water stop material
9b Water stop material 9c Water stop material
9d Water-stopping material 10 Fixed hardware (Gibel fixed hardware)
DESCRIPTION OF SYMBOLS 11 Loosening prevention nut 12 Storage recessed part 13 Filling recessed part 14 Tube 15 Water stop member 20 Shield hole 21 Earth retaining water stop wall 22 Widening part 23 Segment

Claims (5)

  A shear force transmitting member is shielded at a contact portion between a shield hole using a segment having a main girder, a joint plate and a vertical rib as a lining material, and a retaining water blocking wall constructed in contact with the segment of the shield hole. In the structure of the contact portion between the underground structural member and the earth retaining water wall configured by penetrating the segment from the inside of the hole and projecting into the earth retaining water wall, the shear force transmitting member is An underground structural member and a clasp that are formed from a threaded bolt and are screwed into a threaded hole of a fitting that is fixed to the main girder, joint plate, or vertical rib of the segment. Abutment structure with water wall.   The contact structure between the underground structural member and the earth retaining water wall according to claim 1, wherein the mounting hardware is formed of a threaded sleeve or a long nut. Abutment structure with water wall.   In the contact part structure between the underground structural member and the earth retaining water wall according to claim 1 or 2, a fixing hardware for fixing the shearing force transmission member is attached to the inside of the segment. Abutting structure between the underground structural member and the retaining water retaining wall.   The contact structure between the underground structural member and the earth retaining water wall according to any one of claims 1 to 3, wherein the mounting hardware is a through hole communicating with the screw hole on the front end side and the screw hole on the rear end side. A structure of a contact portion between the underground structural member and the earth retaining water stop wall, wherein one or a plurality of water stopping materials are attached to the flat portion of the through hole in a ring shape.   5. The underground structure member according to claim 4, wherein a plurality of water blocking materials are attached in the axial direction of the shear force transmission member. Abutment structure between the dam and the retaining water wall.

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