JP2006159581A - Combined segment and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a combined segment constituted by integrating an internal reinforced concrete structure and an outer shell from an aspect of strength. <P>SOLUTION: Rod-shaped steel materials 4 are installed on a steel shell equipped with main beams 1, joint plates 5, a skin plate 3 and longitudinal ribs 2 having opening parts 7 so as to cross longitudinal ribs 2 and the steel shell is filled with padding concrete 6 to form a combined segment. In this combined segment, the longitudinal ribs 2 are incorporated in and welded to the skin plate 3 on which the main beams 1 are temporarily placed at predetermined attaching positions, the rod-shaped steel materials 4 are subsequently inserted in the longitudinal ribs 2 to form a member composed of the skin plate 3, the longitudinal ribs 2 and the rod-shaped steel materials 4, this member is integrally molded along with the outer shell composed of the main beams 1 and the joint plates 5, the skin plate 3 and the longitudinal ribs 2 by welding and concrete 6 is cast in the formed outer shell. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a segment used as a lining body in a shield tunnel and a method for manufacturing the segment, and more particularly to a synthetic segment formed by covering a reinforced concrete structure with a steel plate or the like and integrating the same.

  In the method of manufacturing a composite segment having a reinforced concrete structure inside, for example, as shown in Patent Document 1, a plate having a surface arranged on the outer surface of the tunnel among the outer shells of the segments constituting the outer six surfaces is used. An outer shell composed of the remaining five plates is first manufactured, and then a reinforcing bar is placed in the inner space formed by the outer shell, and then the remaining one surface of the outer shell is attached to the first five surfaces. A method is known in which concrete is cast from an injection hole that is finally covered in a part of the outer shell over a surface outer shell.

  In this method, the inner reinforced concrete structure and the outer shell are integrated by attaching protrusions to the outer shell plate. However, in this technology, the reinforcing bars arranged inside and the outer shell are not directly connected, and the projection on the surface of the plate forming the outer shell is in contact with the concrete, and the segment is subjected to a bending load as an external force. When acting, the internal reinforced concrete structure and the outer shell are integrated to resist the external force, and the entire segment is not integrated in strength.

  Further, as disclosed in Patent Document 2, a manufacturing method in which a reinforcing bar is placed on a vertical rib integrated with a main girder that is a part of an outer shell is disclosed. Reinforcement has the effect of improving the strength of the inner periphery of the concrete and avoiding cracking and falling off of the concrete, but if a bending moment occurs in the segment due to soil water pressure, etc., the arc-shaped reinforcement is pulled. There is a risk that the concrete inside the tunnel covering the rebar will fall off trying to be straight.

As a method for producing a synthetic segment in which an internal reinforced concrete structure and an outer shell are integrated in a strong manner, Patent Document 3 discloses in advance a rod-shaped steel material 4 in openings 7 of a plurality of vertical ribs 2 as shown in FIG. Arranged to construct a ladder-like member consisting of bar steel 4 and vertical rib 2, placed in a steel shell consisting of main girder 1 and joint plate 5, and fixed both ends of vertical rib 2 to main girder 1 by welding Finally, a method is shown in which the peripheral edge of the skin plate 3 is welded and fixed to the main girder 1 and the joint plate 5. According to this method, since the bar-shaped steel material 4 is restrained by the vertical ribs 2, the bar-shaped steel material does not come out of the concrete even when a load is applied to the segment, and a combined segment is obtained in a strong manner.
Japanese Patent Laid-Open No. 9-228787 JP-A-8-277698 JP-A-2004-270276

  In the conventional techniques described above, in the manufacturing methods as described in Patent Documents 1 and 2, the reinforcing bars disposed inside do not hinder segment production and can be easily accommodated in the outer shell. When used as a segment, there is a problem that the internal reinforced concrete 6 and the outer shell are not integrated and resist the load generated by the earth water pressure.

  In addition, in the manufacturing method as disclosed in Patent Document 3, the internal reinforced concrete structure and the outer shell function as a structure that resists external force by integrating with the rod-shaped steel material 4 disposed inside the steel shell during the manufacturing of the steel shell. There is a problem that the rib 2 becomes an obstacle and the torch of the welding robot does not reach the welding point and cannot be put on the automatic production line. Also, it is a work within a narrow range even for manual welding, and the work efficiency is extremely bad. It was a problem.

  All the steel shells consisting of the skin plate 3, the vertical rib 2, the main girder 1, the joint plate 5, and the outer edge side bar-shaped steel material 15 are first fully welded so that all welding can be performed by the welding robot. Several methods for inserting the rod-shaped steel material 14 have been tried.

  In a state where the inner edge side bar-like steel material 14 does not exist in the steel shell inner space, there is an advantage that the torch 24 (see FIG. 11c) of the welding robot can reach all the welding locations. However, as shown in FIG. 2, when the rod-like steel material 14 on the inner edge side is inserted into the steel shell later, when the rod-like steel material 4 is inserted from the opening of the longitudinal rib 2 closest to the joint plate 5. And the joint plate 5 interfere with each other, and there is a problem that the rod-shaped steel material 14 cannot be passed through the longitudinal rib 2 beyond that.

  As one method for solving the above-mentioned problem, an attempt has been made to cut out a part of the longitudinal rib 2, but there is a problem that the proof strength of the longitudinal rib 2 against the rod-like steel material 4 is insufficient. As another method, a method of making a hole for inserting the bar-like steel material 4 in the joint plate 5 or notching a part of the joint plate 5 and attaching the notched portion later by welding has been tried. However, there are still problems such as loss of performance as a segment from the viewpoint of water-stopping and anti-corrosion properties, increasing the number of welding points, making it difficult to ensure dimensional accuracy, increasing the number of places that cannot be processed by robot welding, and increasing processing effort. Remained.

The present invention provides a method for manufacturing a synthetic segment that solves the above-described problems, enables main welding to be performed by a welding robot, reduces processing labor, improves productivity, and reduces costs. Objective.
Another object of the present invention is to provide a synthetic segment manufacturing method and a synthetic segment that can reduce the amount of welding shrinkage and improve the dimensional accuracy required for the segment.

  In order to solve the above-described problem, the synthetic segment manufacturing method is configured as follows.

  In the synthetic segment manufacturing method of the first invention, a main girder, a joint plate, a skin plate, and a steel shell having one or more vertical ribs having an opening, and a rod-shaped steel material at the opening of the vertical rib. In a synthetic segment manufacturing method that is installed crossed and filled with filled concrete, after the main ribs and skin plates are welded together, the bar steel is inserted into the openings of the vertical ribs, and then the steel shell is integrated. And filling with filled concrete at the end, and welding is performed so that the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width To do.

  In the synthetic segment manufacturing method of the second invention, the main girder, the joint plate, the skin plate, and the steel shell having one or more vertical ribs having an opening, and the rod-shaped steel material in the opening of the vertical rib. In a method of manufacturing a composite segment that is installed crossed and filled with filled concrete, the main girder is temporarily welded to the skin plate, the longitudinal ribs with openings are permanently welded to the skin plate, and the bar steel is longitudinally welded. Insert the rib through the opening of the rib and temporarily weld the joint plate to at least one of the main girder or skin plate, then skin plate and main girder, skin plate and joint plate, vertical rib and main girder, and main girder and joint The steel shell is integrated into the steel shell by final welding, and finally the concrete is placed inside the steel shell. The total length of the welded portion of each vertical rib with the skin plate is 5% of the segment width. More than 65% Characterized by welding so as to fully.

In the synthetic segment manufacturing method of the third invention, the main girder, the joint plate, the skin plate, and the steel shell having one or more vertical ribs having an opening, and the rod-shaped steel material in the opening of the vertical rib. In a method of manufacturing a synthetic segment that is installed crossing and filled with filled concrete,
The main girder, vertical rib, one joint plate, and skin plate are tack welded to each other, and the main girder's deflection prevention width stopper is the closest to the remaining joint plate from the remaining joint plate mounting position. The main girder, vertical rib, joint plate on one side, and skin plate are welded to the main girder between the mounting positions of the main girder, and then the width stopper for preventing deflection of the main girder is removed. The remaining joint plate after either step of inserting the rod-shaped steel material into the opening of the rib, or removing the width stopper for preventing deflection of the main girder after inserting the rod-shaped steel material into the opening of the longitudinal rib Has a process of placing concrete inside the steel shell,
It welds so that the sum total of the length of the welding part with the skin plate in each vertical rib may be 5% or more and less than 65% of the segment width.

In the synthetic segment manufacturing method of the fourth invention, the main girder, the joint plate, the skin plate, and the steel shell having one or more vertical ribs having an opening, and the rod-shaped steel material in the opening of the vertical rib. In a method of manufacturing a synthetic segment that is installed crossing and filled with filled concrete,
The main girder, vertical rib, one joint plate, and skin plate are tack welded to each other, and the main girder's deflection prevention width stopper is the closest to the remaining joint plate from the remaining joint plate mounting position. After installing the main girder, the vertical rib, the joint plate on one side, and the skin plate between the main girders between the mounting positions of the steel plate, the rod-shaped steel material is inserted into the opening of the vertical rib, and then After the remaining joint plates are fully welded, the main girder deflection prevention width stopper is removed to form an integrated steel shell, and finally the concrete is placed inside the steel shell,
It welds so that the sum total of the length of the welding part with the skin plate in each vertical rib may be 5% or more and less than 65% of the segment width.

In the synthetic segment manufacturing method of the fifth invention, the main girder, the joint plate, the skin plate, and the steel shell having one or more vertical ribs having an opening, and the rod-shaped steel material at the opening of the vertical rib. In a method of manufacturing a synthetic segment that is installed crossing and filled with filled concrete,
The main girder, vertical rib, one joint plate, and skin plate are tack welded to each other, and a steel rod is inserted into the vertical rib having a concave opening on the inner edge of the tunnel, and the fixing steel plate is attached so as to close the concave opening. After the main welding to the vertical rib, the main girder, the vertical rib, one joint plate, and the skin plate are each main welded to form an integrated steel shell, and finally there is a step of placing concrete inside the steel shell. And
Before welding the fixing steel plate to the longitudinal rib, the main girder is temporarily welded to the skin plate by expanding the inner side of the main girder by the welding shrinkage of the longitudinal rib due to welding of the fixing steel plate
It welds so that the sum total of the length of the welding part with the skin plate in each vertical rib may be 5% or more and less than 65% of the segment width.

  In the synthetic segment manufacturing method of the sixth invention, in the invention of any one of the first to fifth inventions, when the rod-shaped steel material is inserted into the synthetic segment steel shell, the synthetic segment steel shell is assembled and cured. It mounts on the positioner which can be angle-adjusted with a tool, is fixed, and after adjusting a positioner to a predetermined angle, rod-shaped steel materials are inserted in the steel shell for synthetic segments.

  In the synthetic segment of the seventh invention, a steel beam having one or more longitudinal ribs having a main girder, a joint plate, a skin plate, and an opening, and a rod-shaped steel material intersecting the opening of the longitudinal rib. A synthetic segment that is installed and filled with filled concrete, wherein the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width.

  In the present invention, tack welding is defined as spot welding (for example, a total weld length of about 20 mm) for temporarily fixing when assembling members to form a segment, and is different from the spot welding in terms of joint strength. Welding is defined as welding with the specifications described in the design drawings.

According to the present invention, it is possible to make the main welding work by the welding robot in a place where the rod-shaped steel material and the vertical rib are arranged densely and densely and the main welding cannot be performed by the welding robot, and the processing labor is greatly increased. Can reduce the productivity of synthetic segments and reduce costs.
Furthermore, the amount of welding between the skin plate and the longitudinal rib can be reduced, and in addition to reducing the welding time and cost, the amount of welding shrinkage can be reduced, so that the dimensional accuracy required for the segment is also improved. .

  Hereinafter, the manufacturing method of the synthetic segment of this invention is demonstrated.

  In the present invention, as shown in the production procedure flow of FIG. 3, the main welding of the steel shell is performed after the longitudinal rib and the skin plate are finally welded and the rod-shaped steel material is inserted so as to intersect the longitudinal rib. This manufacturing method makes it possible to perform robot welding of the main welding, which is difficult with this manufacturing method, and it is possible to manufacture an efficient synthetic segment that can reduce manufacturing time and cost.

Embodiments of the first invention are shown below.
As shown in FIG. 11, the skin plate 3 is placed on the boat-shaped jig 12 (see FIG. 12) (see FIG. 11 a), and the main girder 1 is placed on the skin plate 3 with a scale 23, etc. Temporarily fix and set the jig 12 (see FIG. 11b). The main beam 1 and the skin plate 3 are temporarily welded. Next, the longitudinal ribs 2 are sandwiched between the main girders 1 and finally welded to the skin plate 3 (see FIGS. 11c and 11d), and then the bar-shaped steel material 4 is inserted into the longitudinal ribs 2 (see FIG. 11d). After inserting the rod-shaped steel material 4, the joint plate 5 is set in a jig and temporarily welded (see FIG. 11 e). After the entire steel shell is taken out of the jig, the main girder 1 and the joint plate 5 are finally welded, 1 and the longitudinal rib 2 are finally welded, and the periphery of the skin plate 3 is finally welded to the main girder 1 and the joint plate 5.

  In general, a steel segment that is structurally different from a synthetic segment receives the jacking force of the shield machine by the vertical rib 2, so that the accuracy of the installation position (street) of the vertical rib 2 becomes important. If the mounting position accuracy is poor, it will cause buckling of the main girder 1, vertical rib 2 and skin plate 3 when jacking force is applied. In the method of attaching the vertical rib 2 to the skin plate 3 in advance, the accuracy of the vertical rib 2 required for the steel segment is affected by the cutting accuracy of the skin plate 3, the bending accuracy, the mounting position of the vertical rib 2 and the angle. It cannot be secured.

  However, in the synthetic segment, the concrete thrust 6 is responsible for the jack thrust, so the accuracy of the mounting position of the vertical rib 2 may be rough, and the vertical rib 2 is first attached to the skin plate 3 by the main welding first. Will not cause any trouble.

Detailed assembly procedures of one embodiment of the first, second and sixth inventions are shown in the following (1) to (6).
(1) The members of the skin plate 3 and the main girder 1 are arranged in the assembly jig, the main girder 1 is fixed to the jig with a scale 2323, etc., and the skin plate 3 and the main girder 1 are tack welded. As the assembly jig, work efficiency is improved by using a ship-shaped jig having a curvature so that the work can be performed downward.

  As shown in FIG. 12, the structure of the hull-shaped jig 12 is such that a plurality of skin plate setting girders 25 are spaced between main girder temporary fixing plate members 26 arranged at the same level in parallel at intervals. Are arranged in parallel with each other so that the upper surface is located at a lower level than the upper surface of the plate member 26, and are integrated by a steel connecting member 27 disposed over them so as to be integrally connected to each other. The girder 25 having the same curvature as the steel shell of the synthetic segment to be formed is laid on the lower end, and the skin plate 3 can be installed on the arc inner edge side (upper surface side) of the girder 25 To do. It is preferable to arrange two or more rows of girders 25 in the boat-shaped jig 12 so that the skin plate 3 can be received stably without bending. A plate member 26 for temporarily placing the main girder 1 on both sides in the arc direction is attached in parallel to the above-described girder member 25 for installing the skin plate.

  The distance between the main girder temporary fixing plate members 26 is a predetermined segment width interval (the main girder 1 on both sides) so as to cover the main girder 1 on both sides of the segment steel shell so that the final shape of the segment can be accurately performed within the dimensional tolerance. (External surface distance). The main girder temporary fixing plate 26 is preliminarily marked with the position where the vertical rib 2 is arranged in order to increase the work efficiency, and when the vertical rib 2 is installed in the steel shell, the manufacturing accuracy is ensured and the main girder 1 is secured. An auxiliary jig 28 is formed so as to straddle the main girder temporary fixing plate members 26 on both sides so that the auxiliary jig 28 can be vertically fixed to the main girder temporary fixing plate members 26 on both sides. Is installed using an appropriate detachable fixing bracket (not shown), the vertical rib 2 is arranged on the skin plate 3 along the auxiliary jig 28, and the skin plate 3 and the vertical rib 2 are welded. . The vertical rib 2 can be attached to the main girder 1 vertically by using the auxiliary jig 28 for setting the vertical rib installed perpendicularly to the main girder 1.

(2) The main welding of the vertical rib 2 and the skin plate 3 is performed in a temporary assembly jig.
As shown in FIG. 6, the main welding method is staggered intermittent welding in which the longitudinal ribs 2 are shifted in the longitudinal direction on both sides of the longitudinal ribs 2, with a good balance evenly on both sides of the longitudinal ribs 2 and the segment width direction. Although it is preferable for the stability of the structure to arrange the welding location, it may be a parallel intermittent welding in which the welding positions are the same on both sides of the vertical rib 2 or may be a welding of only one side of the vertical rib 2. Welding may be performed over the entire length of the contact area between the vertical rib 2 and the skin plate 3, but since the influence of strain generated after welding becomes large, the manufacturing accuracy tends to deteriorate, and the processing cost increases. Is preferred to avoid.

  If the main welding of all the members is performed in the assembled boat-shaped jig 12, the exclusive time of the jig 12 is increased by the welding time, and the production efficiency is deteriorated. In order to secure the production amount, the number of jigs 12 is increased and the cost is increased, so that the steel shell is temporarily attached in the jig 12 for temporary assembly, and the main welding is performed by taking out from the jig 12. . In the composite segment, the jack thrust is received by the concrete 6 and the vertical rib 2 does not receive the jack thrust and the degree of fixation to the skin plate 3 may be low. The welding length may be small, and even if this part is fully welded in the jig 12 during temporary assembly, the time required for the jig 12 is short. The effect on cost is small without increasing the number of jigs 12.

In order to increase the working efficiency, it is preferable to perform welding of the skin plate 3 and the vertical rib 2 by a robot. The welding robot has a shape with an arm, and a torch 24 shown in FIG. 11 is fixed to the tip of the arm.
(3) The rod-shaped steel materials 4 (14, 15) on the inner and outer circumferences are inserted into the assembled boat-shaped jig 12.
(4) When the rod-shaped steel material 4 (14, 15) is inserted into the assembled boat-shaped jig 12, the jig 12 is attached to the positioner 11 shown in FIG. 8, and the posture of the jig 12 is changed so that it can be easily inserted. Also good.

  The positioner 11 is provided with a support 32 having a support 32 in which a support 32 is vertically attached to a substrate 31 installed on a horizontal plane, a turntable 33 is rotatably attached to the support 32, and a base end is attached to the turntable 33. The cradle 29 is supported. The cradle 29 can be set at an arbitrary angle by rotating the turntable 33. The hull jig 12 is fixed to the cradle 29 by means of detachable fixing means such as bolts and nuts (not shown). Since the hull jig 12 is loaded on the cradle 29, the curvature of the cradle 29 is the same as that of the hull jig 12. It is desirable to make them equal. Further, as a method of rotating the cradle 29 at a predetermined position, a method using a driving device such as a motor or a manual method may be used. For example, the turntable 33 is rotatably supported by the support 32, a drive device or a manual handle is attached to the support 32, and a fixed internal gear is meshed with the drive pinion in the turntable 32. You may make it rotate.

(5) The joint plate 5 is assembled in the jig 12, and tack welding is performed.
(6) The temporarily assembled segment is taken out from the assembly jig 12 and main welding is performed.
Because there are places where welding is difficult due to the structure of the jig 12 for temporary assembly, and there are places where welding is not possible, such as the outer periphery welding of the skin plate 3 with the boat-type jig 12, all of the segments must be taken out of the jig 12 It cannot be welded. In addition, if all the main welding is performed in the temporary assembly jig 12, the segments may be deformed due to welding shrinkage and cannot be removed from the jig 12. It is better to avoid that.

  When a full-scale steel shell assembly test was conducted, it was confirmed that all welding was possible with a welding robot, and that the production time of the steel shell could be achieved to the same extent as the conventional steel segment. The angle of the positioner 11 is such that the skin plate 3, the main girder 1, and the longitudinal rib 2 are temporarily welded, and when the joint plate 5 is incorporated and the main plate is welded to the skin plate 3, the ship-shaped jig 12 is welded downward. It was confirmed that the work load could be reduced by inclining sideways by 90 degrees about the longitudinal direction of the segment (see FIG. 8c) when the rod-shaped steel material 4 was inserted, with the inner edge side with curvature facing upward.

  Generally, in order to integrate the vertical rib 2 and the skin plate 3 in the steel segment, as shown in FIGS. 7 (a) and 7 (b), as shown in FIGS. In order to secure a total weld length of 65% or more of the segment width, it is shown in the tunnel standard specification (Japan Society of Civil Engineers) and the shield standard segment (Japan Sewerage Association).

  On the other hand, the functions of the longitudinal ribs 2 in the composite segment are only a) to prevent the rod-shaped steel material 4 from coming out from the inside of the segment, and b) to resist the shearing force in the tunnel radial direction as a tensile material. It is not necessary to be firmly integrated with the plate 3, and the welding length per vertical rib 2 between the vertical rib 2 and the skin plate 3 can be realized as a member at least as compared with a general steel segment. And found that it may be less than 65% of the segment width.

  If the vertical ribs 2 are not welded to the skin plate 3 at all, the skin plate 3 may protrude unevenly when the concrete 6 is placed, or the skin plate 3 may bend when the segments are transported, and workability of the skin plate 3 may be reduced. Since there is a fear, it is necessary to secure 5% or more with respect to the segment width which is a welding amount of about the tack welding as the welding length of at least the vertical rib 2 and the skin plate 3.

  In order to ensure the high deformation performance by secondary design of the segment, the vertical rib 2 and the skin plate 3 are formed for the purpose of increasing the integrity of the skin plate 3 and the vertical rib 2 and increasing the restraining effect of the filling concrete 6. What is necessary is just to ensure 10% or more as a ratio with respect to the segment width of welding length. Considering economic efficiency, it is preferable to make it about 10 to 30%. Furthermore, in addition to economical efficiency, when considering the workability and the viewpoint of distortion prevention by welding, it is most preferable that the content be 10 to 20%. After the segments temporarily assembled as described above are main-welded, as shown in FIG. 1, the filled concrete 6 is filled so as to embed the rod-shaped steel material 4, thereby producing the synthetic segment 13. Therefore, the synthetic segment 13 as shown in FIG. 1 is produced in the same manner as in the prior art except that the synthetic segment manufacturing procedure and the welded portion length of the vertical rib 2 with the skin plate 3 are different from the conventional case.

Next, an embodiment related to the third and fourth inventions of a system in which one of the joint plates 5 is retrofitted using the width stoppers 8 and 9 as shown in FIGS. In addition, since it is the same as that of the said embodiment except the point which uses the width | variety stoppers 8 and 9, and attachment of a joint plate at the end of an assembly, the same part uses the said description and mainly demonstrates a different part. To do.
The case where the width stop material 8 as shown in FIG.
(1) The main girder 1, the longitudinal rib 2, the joint plate 5 on one side, and the skin plate 3 member are placed in an assembly jig and tack welding is performed.
(2) A simple width stop member 8 is installed in the joint portion opened on the opposite side in order to secure the segment width dimension. The attachment may be tack welding, or may be mechanically fixed with a scale.
(3) Take out the temporarily assembled segment from the assembly jig and perform the first main welding.
(4) After the main welding is finished, the rod-shaped steel material 4 is inserted. As the width stop material 8, it is preferable to provide an opening for inserting the rod-shaped steel material 4 in advance so that the rod-shaped steel material 4 can be inserted. However, when the plate material is used as the width stop material 8, the width before the rod-shaped steel material 4 is inserted. The stop material 8 is removed, and then the rod-shaped steel material 4 is inserted into the vertical rib 2.
(5) Install the remaining joint plates and perform the second main welding.

  When the first main welding is performed, there is no bar-like steel material 4 on the inner surface of the segment, so that the workability of welding is good. As the width stopper 8, it is preferable to use a steel plate having a height similar to that of the joint plate 5 in order to prevent the deflection of the main girder 1 uniformly from the inner edge side to the outer edge side of the main girder 1.

  Further, the width stopper 8 may be attached from the outside of both the main girders 1 as shown in FIG. 5 instead of being sandwiched between the main girders 1 as described above. In this case, in the step (4) in the case where the width stopper material 9 is sandwiched between the main girders 1, when the rod-shaped steel material 4 is inserted, the width stopper material 9 is left without being removed, and the width in the step (5). If the remaining joint plate 5 is welded while the stopper 9 is used, the deformation of the free end portion of the main girder 1 that occurs when the width stopper 9 is removed can be prevented.

Next, an embodiment according to the fifth invention is shown in the following (1) to (4) with reference to FIG. 9, FIG. 10, FIG. 13 and FIG. In addition, since it is the same as that of the said embodiment except considering the welding shrinkage allowance of the vertical rib which generate | occur | produces when the fixing steel plate 16 is welded to the vertical rib, the same part uses the said description and is a different part. Is mainly explained.
(1) The main girder 1, skin plate 3 and vertical rib 2 are temporarily assembled in the boat-shaped jig 12 and the main girder 1 and vertical rib 2 and skin plate 3 and main girder 1 and vertical rib 2 are tack welded. . Considering the welding shrinkage allowance of the vertical ribs generated when the fixing steel plate 16 is welded to the vertical ribs, as shown in FIG. In the final state after welding the fixing steel plate 16 to the vertical rib 2, the width of the segment is welded in advance so that it is within ± 1.5 mm as defined in the steel segment of the standard segment for shield construction (Japan Sewerage Association). It is desirable to actually verify the shrinkage allowance and confirm the allowable error of the expansion width h18 on the inner peripheral side of the main beam 1.

(2) Insert the outer peripheral side bar-shaped steel material 15.
(3) The joint plate 5 is set in the ship-shaped jig 12 (positioned at a predetermined position and tack welded), the segment main body is taken out from the ship-shaped jig 12, and the segment main body (the main girder 1 and the vertical rib 2 Main welding, main welding of the main girder 1 and the joint plate 5, and main welding of the skin plate 3 and the main girder 1, the joint plate 5, and the vertical rib 2) are performed.

(4) After the rod-shaped steel material 14 is fitted into the concave opening 7a on the inner peripheral side of the vertical rib 2, as shown in FIG. 9 (b) or FIGS. 13 (a) to (c), the fixing steel plate 16 is covered. Install by welding. When the welding of the fixing steel plate 16 and the longitudinal rib 2 is performed, the interval between the main girder 1 on the inner peripheral side is reduced due to welding contraction, and the inner and outer peripherals are designed to satisfy a predetermined segment width dimension. Since the outer peripheral side is restrained by the skin plate 3 welding first, even if the fixing steel plate 16 is welded to the inner peripheral side, the width dimension does not change.

  As a method of attaching the fixing steel plate 16 to the longitudinal rib 2, it is preferable from the viewpoint of ease of processing that the rod-shaped steel material 14 is attached to the side surface of the longitudinal rib 2 as shown in FIGS. As shown in FIG. 14, it may be mounted on the end of the vertical rib 2 and fixed by welding.

  Using a test piece of actual size (segment width 1200mm, girder height 250mm), the welding length per vertical rib 2 between the vertical rib 2 and the skin plate 3 of the composite segment is 15% of the segment width. The time and the distortion correction time due to welding were reduced by about 1/5 compared to the conventional case, and the total manufacturing time of the steel shell was halved compared to when the conventional welding time was 65% or more. In addition, the reduction in weld length improves the accuracy of the width of the steel shell, and there is no deviation from the dimensional tolerance specified in the standard segment for shield construction (Japan Sewerage Association). -Strain correction after welding of the vertical ribs 2 is no longer necessary. In addition, in order to investigate the influence on the structural strength performance due to the decrease in weld length, a single bending test and a jack thrust test were performed using the above-mentioned test specimens, but the test specimens exceeded the design load in both tests. It showed proof strength, and the skin plate 3 did not protrude out of the plane and buckled up to the design load, and it was confirmed that there was no influence on the weld strength reduction in terms of structural strength.

  Regarding the segment manufacturing method of the structure using the fixed steel plate 16 according to the fifth invention, a shrinkage allowance experiment previously provided on the inner side 21 of the main girder before welding the steel plate using a full-size test piece (segment width 1200 mm, girder height 250 mm) Carried out. As a result, as shown in FIG. 13 (b), the steel plate to be attached to the vertical rib 2 is 4.2mm when welding with a groove 6mm + fillet 4mm, and only with a fillet 4mm as shown in FIG. 13 (c). In the case of welding, it can be seen that welding shrinkage occurs at the position 21 in the inner edge side of the 3.1 mm segment width direction main girder. It was confirmed that the width dimension of the segment after welding to the vertical rib 2 was within a predetermined accuracy.

It is the perspective view which abbreviate | omitted a part which shows the structure of a synthetic | combination segment. It is the figure which showed the example which bar-shaped steel materials and a joint board interfere and cannot insert bar-shaped steel materials. It is the figure which showed the manufacture procedure flowchart of the synthetic segment which concerns on this invention. It is the figure which showed the example using the width stop material which concerns on this invention. It is the figure which showed the example using the width | variety stopper material of the shape covered from the outer side of the main beam which concerns on this invention. It is the figure which showed an example of the main welding of the vertical rib of the synthetic | combination segment which concerns on this invention, and a skin plate. It is the figure which showed an example of the main welding of the longitudinal rib and skin plate of the conventional steel segment. (A)-(c) is the figure which showed the utilization method of the positioner based on this invention. It is the figure which showed an example of the vertical rib (b) which attaches the vertical rib (a) only for drilling which concerns on this invention, and a fixing steel plate. It is the figure which showed the raising of the main girder at the time of using the fixing steel plate which concerns on this invention. (A)-(e) is the figure which showed an example of the manufacturing method of the synthetic segment which concerns on this invention. It is the figure which showed the hull form jig | tool which concerns on this invention. It is the figure which showed the example (when a fixing steel plate is attached to the side surface of a vertical rib) which attached the fixing steel plate which concerns on this invention to the vertical rib. It is the figure which showed the example (when attaching a fixing steel plate on the edge part of a vertical rib) and attaching the fixing steel plate which concerns on this invention to the vertical rib.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main girder 2 Vertical rib 3 Skin plate 4 Bar-shaped steel material 5 Joint plate 6 Filled concrete 7 Opening part for insertion of vertical steel bar-shaped steel material 7a Recessed opening 8 Width stop material (when arranged between main beams)
9 Width stop material (when placed so as to surround from the outside of the main beam)
10 Welded part of skin plate and vertical rib 11 Positioner 12 Assembly ship type jig (or temporary assembly jig)
13 Composite segment 14 Inner edge side bar-shaped steel material 15 Outer edge side bar-shaped steel material 16 Fixed steel plate 17 Vertical rib (type using fixed steel plate)
18 Raised Height When Using Fixed Steel Plate 19 Segment Normal Width 20 Segment Width After Expanding Inner Edge Side Main Girder 21 Segment (Main Girder) Inner Edge Side 22 Segment (Main Girder) Outer Edge Side 23 Welding robot torch 25 Girder for installing the skin plate on the inner side of the hull jig 26 Main plate for temporarily fixing the main girder outside the hull jig 27 Connecting material for the girder for setting the skin plate of the hull jig and the main girder temporary fixing plate 28 Auxiliary jig for setting longitudinal ribs 29 Positioner hull jig pedestal 30 Welded part between fixing steel plate and vertical rib 31 Positioner substrate 32 Positioner column 33 Positioner turntable 34 Welding welding of fixing steel plate 35 Fixing steel plate groove 35 Fillet welding

Claims (7)

A steel plate with one or more vertical ribs with a main girder, joint plate, skin plate, and opening is installed to cross the opening of the vertical ribs and filled with concrete. In the method for producing a synthetic segment,
After the main welding of the vertical rib and the skin plate, the rod-shaped steel material is inserted into the opening of the vertical rib, and then the steel shell is integrated and finally filled with filled concrete,
A synthetic segment manufacturing method, wherein welding is performed such that the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width. A steel plate with one or more vertical ribs with a main girder, joint plate, skin plate, and opening is installed to cross the opening of the vertical ribs and filled with concrete. In the method for producing a synthetic segment,
Temporarily weld the main girder to the skin plate, fully weld the vertical rib with the opening to the skin plate, insert the bar steel material into the opening of the vertical rib, and connect the joint plate to at least one of the main girder or the skin plate Temporarily welded, and then the steel plate and main girder, skin plate and joint plate, vertical rib and main girder, and main girder and joint plate were welded together to form an integrated steel shell, and finally the concrete inside the steel shell. Having a process of placing,
A synthetic segment manufacturing method, wherein welding is performed such that the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width. A steel plate with one or more vertical ribs with a main girder, joint plate, skin plate, and opening is installed to cross the opening of the vertical ribs and filled with concrete. In the method for producing a synthetic segment,
The main girder, vertical rib, one joint plate, and skin plate are each assembled by tack welding, and the main girder's deflection prevention width stopper is closest to the remaining joint plate from the mounting position of the remaining joint plate. Installed across the main girders between the installation positions of the vertical ribs, and after main welding the main girders, vertical ribs, joint plate on one side, and skin plate, respectively, removed the width stoppers for preventing deflection of the main girders. Remained after either step of inserting the rod-shaped steel material into the opening of the longitudinal rib later, or removing the width stopper for preventing the main girder from being inserted after the insertion of the rod-shaped steel material into the opening of the longitudinal rib The joint plate is welded and integrated into a steel shell, and finally the concrete is placed inside the steel shell,
A synthetic segment manufacturing method, wherein welding is performed such that the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width. A steel plate with one or more vertical ribs with a main girder, joint plate, skin plate, and opening is installed to cross the opening of the vertical ribs and filled with concrete. In the method for producing a synthetic segment,
The main girder, vertical rib, one joint plate, and skin plate are assembled by tack welding, and the main girder's deflection prevention width stopper is closest to the remaining joint plate from the mounting position of the remaining joint plate. Installed between the main girders between the installation positions of the vertical ribs, and after welding the main girders, the vertical ribs, the joint plate on one side, and the skin plate, respectively, insert a bar-shaped steel material into the opening of the vertical ribs, Then, after the remaining joint plate is fully welded, the width stop material for preventing deflection of the main girder is removed to form an integrated steel shell, and finally a step of placing concrete inside the steel shell,
A synthetic segment manufacturing method, wherein welding is performed such that the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width. A steel plate with one or more vertical ribs with a main girder, joint plate, skin plate, and opening is installed to cross the opening of the vertical ribs and filled with concrete. In the method for producing a synthetic segment,
The main girder, vertical rib, one joint plate, and skin plate are tack welded to each other, and a steel rod is inserted into the vertical rib having a concave opening on the inner edge of the tunnel, and the fixing steel plate is attached so as to close the concave opening. After the main welding to the vertical rib, the main girder, the vertical rib, one joint plate, and the skin plate are each main welded to form an integrated steel shell, and finally there is a step of placing concrete inside the steel shell. And
Before welding the fixing steel plate to the longitudinal rib, the main girder is temporarily welded to the skin plate by expanding the inner side of the main girder by the welding shrinkage of the longitudinal rib due to welding of the fixing steel plate
A synthetic segment manufacturing method, wherein welding is performed such that the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width.   When inserting the rod-shaped steel material into the steel shell for the synthetic segment, place the steel shell for the synthetic segment on the positioner with adjustable angle together with the assembly jig, and adjust the positioner to a predetermined angle. The method for producing a synthetic segment according to any one of claims 1 to 4, wherein the bar-shaped steel material is inserted into a steel shell for the synthetic segment after the process.   A steel plate with one or more vertical ribs with a main girder, joint plate, skin plate, and opening is installed to cross the opening of the vertical ribs and filled with concrete. A combined segment, wherein the total length of the welded portion of each vertical rib with the skin plate is 5% or more and less than 65% of the segment width.

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