JP5160521B2 - Synthetic segment - Google Patents

Description

  The present invention relates to a segment used as a lining structure for a shield method, and more particularly to a composite segment having a composite structure of steel and concrete.

  In the shield construction method in which a tunnel is constructed with a shield machine underground, a cylindrical tunnel is constructed by interconnecting arc-shaped segments in the circumferential direction and the tunnel axis direction as the shield machine digs.

  As a segment used for the shield method, three types are known: an RC segment (a reinforced concrete segment), a steel segment, and a composite segment having a composite structure of steel and concrete.

  The RC segment is a segment that is frequently used from the viewpoint of cost and anticorrosion properties, but even when large bending or shearing is applied, the amount of reinforcing bars that can be placed is limited due to the placement of the reinforcement and concrete. (Generally about 1.2% of the tensile reinforcement ratio) In reality, it can only be dealt with by increasing the member thickness. Further, in the sharp curve portion, there is a problem that an excessive pressing force acts due to the jack reaction force of the shield machine, and the concrete is cracked or chipped. On the other hand, the synthetic segment has an advantage that the manufacturing cost is increased, but the thickness can be reduced, and the drilling diameter can be reduced, the amount of excavated soil can be reduced, and the construction period can be shortened.

  As the simplest structure, the synthetic segment has a structure in which a reinforcing bar is placed in a steel shell composed of a main girder, a joint plate, and a skin plate, and then concrete is filled, as shown in Patent Document 1 below. However, in the case of such a synthetic segment, there was a problem that the steel shell and the internal reinforced concrete were not integrated and resisted against earth pressure and water pressure.

  Therefore, in Patent Document 2 below, a steel plate having a main girder, a joint plate, a skin plate, and a vertical rib having an opening is installed with a bar-shaped steel material crossing the vertical rib, and filled with filled concrete. In the composite segment, the vertical ribs are assembled and welded on the skin plate where the main girder is temporarily placed at a predetermined mounting position, and then the bar-shaped steel material is inserted into the vertical ribs, and the members composed of the skin plate, the vertical ribs, and the bar-shaped steel material are inserted. Finally, a synthetic segment is proposed in which the member is formed into a main girder, and the outer shell consisting of a joint plate, a skin plate and vertical ribs are integrally formed by welding, and concrete is placed inside the formed outer shell. .

  Also, in Patent Document 3 below, a composite segment is provided in which embedded fittings are provided on the joint surfaces of the segments to engage and join the segments, and the fittings and the main structural material of the segment body are joined by welding or bolts. Thus, a synthetic segment using a plurality of protrusions or striped ridged steel sheets as the main structural material has been proposed.

  Furthermore, in the following Patent Document 4, the main girder plate installed along the circumferential direction of the tunnel, the joint plate installed along the axial direction of the tunnel, and the main girder plate and the joint plate are installed on the natural ground side. In a synthetic segment in which a plurality of main reinforcements and shear reinforcements are installed in a steel shell consisting of a back plate and filled with concrete, the main reinforcement is installed along the circumferential direction of the tunnel, The end portion of the main reinforcing member is fixed to the joint plate by engaging the engaging portion and the fixing portion formed on the end portion of the main reinforcing member and the inner side portion of the joint plate, respectively. A synthetic segment is proposed in which the section and the fixing section are formed in a substantially T-shaped section and a substantially lip-shaped section, respectively. Here, as the main reinforcing material, a reinforcing bar, a deformed reinforcing bar, a perforated steel plate, a striped steel plate, and a steel plate with a rhombus projection are used.

  In the following Patent Document 5, the steel shell 2 is curved in a substantially arc shape and is provided with a pair of first steel materials provided on two opposite sides of the outer peripheral surface, and two sides that are curved in a substantially arc shape and are opposed to the inner peripheral surface. A synthetic segment (first synthetic segment) having a pair of second steel materials provided on the outer surface, the end surfaces of the first and second steel materials being exposed to the outside and forming a seal groove, and the first and second steel materials The third steel material and the fourth steel material are arranged inside or separated from each other, and the third steel material and the fourth steel material are connected by lattice, concrete is placed inside the steel shell, and the skin is formed on the outer peripheral surface. A composite segment (second composite segment) in which plates are welded has been proposed.

Japanese Patent Laid-Open No. 2002-21489 JP 2006-159581 A JP-A-9-32491 Japanese Patent No. 3893848 JP 2006-249814 A

  However, as in the synthetic segment shown in Patent Document 2 described above, a bar-shaped member (rebar) is arranged as a main steel material, which requires a large number of arrangements and takes a lot of time and labor to manufacture, and also increases the weight of the steel material. However, there were problems such as increased production costs.

  In Patent Document 3, a steel plate with protrusions or striped ridges is used as the main steel material, but there is a problem that the section rigidity is low and the segment thickness is increased.

  Furthermore, the above-mentioned Patent Document 4 is provided with a main reinforcing material and a shear reinforcing material in a steel shell, and the main reinforcing material is coupled to a joint plate, so that the steel and concrete can be integrated. is there. However, the installation of the shear reinforcement member arranged in the thickness direction so as to connect the main reinforcement member and the skin plate takes a lot of labor and time, and there is a problem that the production cost increases.

  The first synthetic segment of the so-called built-up structure shown in Patent Document 5 can reduce the manufacturing cost because the amount of steel used can be reduced, but the adhesion between the first and second steels and concrete ( Integrity) cannot be secured, and the structural strength is insufficient for external forces. Moreover, the yield strength in the direction of the distribution bar cannot be ensured. In addition, the second synthetic segment has a structure in which the third steel material and the fourth steel material are arranged inside the first and second steel materials by being connected or separated, and each is connected by a connecting member such as a lattice material. , The integrity with concrete is ensured and the structural strength is sufficient, but the amount of steel of the third and fourth steel materials increases, and the steel material covering the entire surface of the joint between rings is used as the main girder. There was a large difference between the amount of steel and the case, and there was a problem that the manufacturing cost could not be substantially reduced.

  Therefore, the main problem of the present invention is that, in a composite segment having a composite structure of steel and concrete, the production cost is particularly low and the economy is excellent, and by integrating the steel and concrete, the steel and concrete can be integrated. It is an object of the present invention to provide a synthetic segment capable of sufficiently exhibiting the strength characteristics and capable of sufficiently thinning.

In order to solve the above-mentioned problem, as the present invention according to claim 1, as the main girder arranged along the circumferential direction of the tunnel on both side surfaces, the ends of the main girder are connected to each other at both ends, and in the tunnel axial direction. In the synthetic segment formed by placing and filling the joint plate placed along the concrete,
The main girder is a divided main girder separated into an outer peripheral side steel material arranged on the outer peripheral surface side and an inner peripheral side steel material arranged on the inner peripheral surface side, and at a position adjacent to the main girder. And the main steel material is arranged along the tunnel circumferential direction inside the concrete,
The main girder and the main steel material are arranged separately, and the outer peripheral side steel material and the inner peripheral side steel material constituting the divided main girder are arranged at predetermined intervals in the tunnel circumferential direction on the back side, and a plate oriented plane so as to face the tunnel circumferential direction, and characterized in that it is directly connected by a concave notch forms a U-shape when viewed strip made of oriented steel sheet outward only A composite segment is provided.

In the invention according to the first aspect, together with the main beam is and the outer steel disposed on the outer peripheral surface, the divided main beam separated into an inner peripheral side steel which is disposed on the inner peripheral surface side, the A main steel material is disposed along the circumferential direction of the tunnel at a position adjacent to the main beam and inside the concrete, and the main beam and the main steel material are separately disposed.
The outer peripheral side steel material and the inner peripheral side steel material are arranged at a predetermined interval in the tunnel circumferential direction on the back side, and oriented with the plate surface facing the tunnel circumferential direction, and are U-shaped in plan view. And a structure in which the concave notch is directly connected only by a strip made of a steel plate oriented outward.

  Therefore, the amount of steel used can be reduced by making the main girder a divided main girder, and the production cost can be reduced. The divided main girders are arranged at a predetermined interval in the circumferential direction of the tunnel and oriented with the plate surface facing the circumferential direction of the tunnel, forming a U-shape in plan view and the concave notch portion on the outside Since the strips are connected to each other by strips made of steel plates oriented toward each other, the plate surfaces of the strips function as concrete bearing surfaces, and as a structural system that resists bending moment even without diagonal materials In addition to being established, the integrity with the concrete can be sufficiently secured, so that a structure capable of reliably resisting external force by the cooperative action of the concrete and the main girder is obtained. Furthermore, since steel materials are respectively arranged on the outer peripheral side and the inner peripheral side, it is possible to prevent cracking and chipping of concrete during transportation and assembly.

  As the strip, a steel plate that is U-shaped in plan view and oriented with the concave notch facing outwards ensures distance from the side of the segment and prevents cracking of the concrete due to insufficient thickness. become able to.

  As the present invention according to claim 2, the joint plate is a split joint plate separated into an outer peripheral side steel material arranged on the outer peripheral surface side and an inner peripheral side steel material arranged on the inner peripheral surface side. A synthetic segment according to Item 1 is provided.

  The invention according to claim 2 is a split joint plate separated into an outer peripheral side steel material arranged on the outer peripheral surface side and an inner peripheral side steel material arranged on the inner peripheral surface side for the joint plate. is there. Thereby, the reduction of the further steel material usage-amount can be aimed at.

  As the present invention according to claim 3, there is provided the composite segment according to any one of claims 1 and 2, wherein the strips are connected by a reinforcing bar or a steel material arranged in the tunnel axis direction.

  In the invention described in claim 3, the strips are connected to each other by a reinforcing bar or a steel material arranged in the tunnel axis direction. By connecting the strips with reinforcing bars or steel materials arranged in the tunnel axis direction, the integrity of the concrete is further secured, and the yield strength in the direction of the reinforcing bars is secured.

  The synthetic segment according to any one of claims 1 to 3, wherein seal grooves are formed on the outer surface of the outer peripheral side steel material and the outer surface of the inner peripheral side steel material of the main girder and the joint plate as the present invention according to claim 4. Is done.

  In the invention described in claim 4, seal grooves are formed on the outer surface of the outer peripheral side steel material and the outer surface of the inner peripheral side steel material of the main girder and the joint plate. Thereby, the clearance gap between synthetic segments can be sealed and water leakage etc. can be prevented.

  The synthetic segment according to any one of claims 1 to 3, wherein a seal groove is formed in a concrete surface between the outer peripheral side steel material and the inner peripheral side steel material of the main girder and the joint plate as the present invention according to claim 5. Is provided.

  In the invention described in claim 5, a seal groove is formed on the concrete surface between the outer peripheral side steel material and the inner peripheral side steel material of the main girder and the joint plate. As a result, the sealing process on the divided main beam can be omitted, and a seal groove can be easily formed by placing concrete.

As the present invention according to claim 6, synthetic segment according to any one of claims 1 to 5, the reinforcing bars are arranged along the tunnel circumferential direction is provided.

Invention described in claim 6 is that the reinforcing bars are arranged along the tunnel circumferential direction. By arranging the reinforcing bars, high strength reduction and thinning of the segment is possible.

As the present invention according to claim 7, synthetic segment of claim 1, wherein the main steel material made of the shaped steel are connected to the joint plate is provided.

Invention of the seventh aspect, the main steel material made of the shaped steel is intended for coupling with the joint plate. By connecting the main steel material to the joint plate, it improves the rigidity of the joint plate, stress transfer tunnel circumferential direction becomes smooth.

  As a present invention according to claim 8, there is provided a composite segment according to any one of claims 1 to 7, wherein a skin plate is installed so as to cover the outer surface side of the main girder and the joint plate.

  The invention according to claim 8 is a synthetic segment in which a skin plate is installed so as to cover the outer surface side of the main girder and the joint plate. In this case, concrete is filled in a steel shell composed of the main girder, the joint plate, and a skin plate.

  As described above in detail, according to the present invention, in the composite segment having a composite structure of steel and concrete, the production cost is particularly low and the economy is excellent. In addition, by integrating the steel material and the concrete, the strength characteristics of the steel material and the concrete can be sufficiently exhibited, and the thickness can be sufficiently reduced.

It is tunnel sectional drawing constructed | assembled by the synthetic | combination segment. It is a partial skeleton perspective view (the 1) of synthetic segment S concerning the present invention. It is a skeleton perspective view (the 2) of synthetic segment S concerning the present invention. It is a skeleton figure from the inner surface of the synthetic segment which concerns on this invention. (A) is a VV arrow view of FIG. 4, (B) is the BB arrow view. (A) is the VI-VI line arrow figure of FIG. 4, (B) is the BB line arrow figure. (A) is the VII-VII arrow directional view of FIG. 4, (B) is the BB arrow directional view. It is a principal part enlarged view which shows the other example of seal groove formation.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, in the shield method of building a tunnel with a shield machine, the arc-shaped segments S1 to S9 are connected to each other in the circumferential direction and the tunnel axis direction along with the excavation by the shield machine. A cylindrical tunnel is constructed.

  As these segments S1 to S9, the synthetic segments according to the present invention are preferably used.

  As shown in FIGS. 1 to 3, the composite segment S connects the main girders 1 and 1 arranged on both side surfaces along the tunnel circumferential direction and the ends of the main girders 1 and 1 at both ends. And a steel shell comprising joint plates 2 and 2 arranged along the tunnel axis direction and a skin plate 3 installed so as to cover the outer surfaces of the main girders 1 and 1 and the joint plates 2 and 2. K is filled with concrete C.

  This will be described in more detail below.

  As shown in FIG. 5A, the main girder 1 is divided into an outer peripheral side steel material 1A disposed on the outer peripheral surface side and an inner peripheral side steel material 1B disposed on the inner peripheral surface side. While being a main girder, the outer peripheral side steel material 1A and the inner peripheral side steel material 1B are arranged at predetermined intervals in the tunnel circumferential direction, and are oriented with the plate surface facing the tunnel circumferential direction 4, 4... The strip 4 is a steel plate having a U-shape in plan view, and is firmly connected by welding or the like on the back side of the outer peripheral steel material 1A and the inner peripheral steel material 1B.

  The main girder 1 is provided with an inter-ring joint 5 between the outer peripheral steel material 1A and the inner peripheral steel material 1B with an interval in the tunnel circumferential direction. Specifically, as shown in FIG. 4, a male joint 5A is provided on one side surface, a female joint 5B is provided on the other side surface, and the tunnel shaft is coupled by coupling the male joint 5A and the female joint 5B. A composite segment S is joined in the direction.

  On the concrete surface between the outer peripheral steel material 1A and the inner peripheral steel material 1B, concave seal grooves 4a and 4b are formed in two upper and lower stages. When the synthetic segment S is assembled in the shield machine, water leakage or the like is prevented by filling the sealing grooves 4a and 4b with a sealing material.

  On the other hand, as shown in FIG. 5 (B), the joint plate 2 was also separated into an outer peripheral side steel material 2A disposed on the outer peripheral surface side and an inner peripheral side steel material 2B disposed on the inner peripheral surface side. Divided joint plate. The concrete between the outer peripheral side steel material 2A and the inner peripheral side steel material 2B is provided with joints for connecting segments in the tunnel circumferential direction (not shown), and concave seal grooves 4c and 4d are formed in two upper and lower stages. Has been.

  The outer circumferential side steel material 1A and the inner circumferential side steel material 1B of the main girder 1 are arranged along the tunnel radial direction at a predetermined interval in the tunnel circumferential direction and oriented with the plate surface facing the tunnel circumferential direction. Are connected to each other by the strips 4. As the band plate 4, a rectangular steel plate can be used, but as shown in FIG. 6 (B), a U-shape is formed in a plan view with the concave notch k facing outward. It is desirable to use a steel plate oriented in the direction. By making it U-shaped, it is possible to secure a distance from the side surface of the segment and prevent cracking of concrete due to insufficient thickness.

  For example, when a lattice member is used as a member for connecting the outer peripheral side steel material 1A and the inner peripheral side steel material 1B, it is possible to connect firmly and rigidly, but the amount of steel material used increases. Therefore, problems such as time-consuming production will occur. On the other hand, as in this embodiment, when the plate surfaces are connected by the strips 4, 4... Oriented with the plate surfaces facing the tunnel circumferential direction, only the strip plate 4 needs to be connected, so the amount of steel used is reduced. It can be greatly reduced, and the strips 4 and 4 function as bearing surfaces for the concrete filled in the middle, so that even if there is no diagonal material, it is established as a structural system that resists bending moments. To come. In addition, the unity with the concrete can be ensured, and a structure that can reliably resist the external force by the cooperative action of the concrete and the main girder.

  As shown in FIG. 6B, the strips 4 and 4 facing in the tunnel axis direction are connected to a position closer to the inner peripheral surface by reinforcing bars 6 (or steel materials) arranged in the tunnel axis direction. As a result, the integrity of the concrete is further ensured, and the proof stress in the direction of the reinforcing bar is ensured. It is desirable that the ends of the reinforcing bars 6 be bent in a U-shape to secure a fixing margin and to smoothly transmit the stress from the inter-ring joint 5.

In the space between the skin plate 3 and the reinforcing bar 6, it is desirable to dispose a main steel material and / or reinforcing bar made of shaped steel along the tunnel circumferential direction. In the illustrated example, as shown in FIG. 6, a total of three main steel members 7 made of H-section steel are arranged in the center and in the left and right positions, and as shown in FIG. 7, six main bars 8 </ b> A and surround these. Two reinforcing bar rods 8 composed of stirrup muscles 8B are arranged. Both end portions of the main steel material 7 are connected by a flat plate 9 to an outer peripheral steel material 2A and an inner peripheral steel material 2B constituting the joint plate 2, respectively. By disposing the main steel material or reinforcing bar made of the shape steel inside the segment, the strength of the segment can be increased and the thickness can be reduced.
Further, by connecting the main steel material 7 to the joint plate 2, the rigidity of the joint plate 2 is improved and the stress transmission in the tunnel circumferential direction is smooth.

[Other examples]
(1) In the above embodiment, the concave seal grooves 4a and 4b are formed on the concrete surface between the outer peripheral side steel material 1A and the inner peripheral side steel material 1B of the main girder 1 in two steps, as shown in FIG. As described above, the seal grooves 1a and 1b can be formed on the outer surface of the outer peripheral steel material 1A and the outer surface of the inner peripheral steel material 1B. The same applies to the joint plate 2.
(2) In the above embodiment, the skin plate 3 installed so as to cover the outer surfaces of the main girders 1 and 1, the joint plates 2 and 2, and the main girders 1 and 1 and the joint plates 2 and 2. Although the concrete shell C is filled in the steel shell K, the skin plate 3 can be omitted and the outer surface can be a concrete surface.

  S ... Synthetic segment, 1 ... Main girder, 1A, 2A ... Outer steel, 1B / 2B ... Inner steel, 2 ... Joint plate, 3 ... Skin plate, 4 ... Strip plate, 5 ... Joint between rings, 6 ... Reinforcing bar, 7 ... Main steel, 8 ... Reinforcing bar, 9 ... Flat plate, K ... Steel shell

Claims (8)

The main girder arranged along the circumferential direction of the tunnel on both side surfaces and the ends of the main girder are connected to each other at both ends, and a joint plate arranged along the tunnel axial direction is arranged to cast concrete. In the synthetic segment filled,
The main girder is a divided main girder separated into an outer peripheral side steel material arranged on the outer peripheral surface side and an inner peripheral side steel material arranged on the inner peripheral surface side, and at a position adjacent to the main girder. And the main steel material is arranged along the tunnel circumferential direction inside the concrete,
The main girder and the main steel material are arranged separately, and the outer peripheral side steel material and the inner peripheral side steel material constituting the divided main girder are arranged at predetermined intervals in the tunnel circumferential direction on the back side, and a plate oriented plane so as to face the tunnel circumferential direction, and characterized in that it is directly connected by a concave notch forms a U-shape when viewed strip made of oriented steel sheet outward only The composite segment to be   The synthetic segment according to claim 1, wherein the joint plate is a split joint plate separated into an outer peripheral side steel material arranged on the outer peripheral surface side and an inner peripheral side steel material arranged on the inner peripheral surface side.   The synthetic segment according to claim 1, wherein the strips are connected to each other by a reinforcing bar or a steel material arranged in the tunnel axis direction.   The synthetic segment according to any one of claims 1 to 3, wherein seal grooves are formed on an outer surface of the outer peripheral side steel material and an outer surface of the inner peripheral side steel material of the main girder and the joint plate.   The synthetic segment according to any one of claims 1 to 3, wherein a seal groove is formed on a concrete surface between the outer peripheral side steel material and the inner peripheral side steel material of the main girder and the joint plate. Synthesis Segment according to any of claims 1 to 5, the reinforcing bars are arranged along the tunnel circumferential direction. Synthesis segment of claim 1, wherein the main steel material made of the shaped steel are connected to the joint plate.   The synthetic segment according to any one of claims 1 to 7, wherein a skin plate is installed so as to cover an outer surface side of the main beam and the joint plate.

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