JP2009013650A - Joint metal for segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint metal for a segment which can be easily manufactured to reduce cost, and can be manufactured in various sizes while reducing equipment cost for manufacturing to the utmost. <P>SOLUTION: This joint metal for joining the adjacent segments to each other comprises female joints 20 which are arranged near the joint surface of the segment, and a male joint which is fitted into the female joints 20 arranged in the adjacent segments in such a manner as to face each other so as to connect the female joints 20. The female joints 20 and/or the male joint have/has a laminated structure of a thin plate 22a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a joint fitting for a segment for constructing a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them together.

Generally, as a method for constructing a tunnel, a so-called shield method is known in which a plurality of concrete segments are connected to each other on the inner surface side of a drilling hole, and a cylindrical wall body is constructed in the axial direction of the drilling hole. Yes. Moreover, what uses the coupling metal fitting described in patent document 1-patent document 3, for example as a joining structure which can join the said segments easily is known. This is done by embedding a C-shaped female joint at positions facing each other on the joint surfaces of adjacent segments, and fitting an H-shaped male joint into a pair of these female joints. Both ends of the joint are engaged with two female joints, respectively, so that these segments are attracted to each other.
Japanese Patent Laid-Open No. 11-236797 JP 2001-98894 A JP 2003-3793 A

 By the way, such joint fittings are generally manufactured by casting, and various sizes of fittings are prepared depending on required applications and strengths. In the production, it is necessary to prepare a plurality of molds according to various sizes. However, the cost and labor for producing and managing these molds are increased, and the time for melting and solidifying is required for the production of fittings. As a result, the process management effort also increases. Therefore, the product price of the fitting is increased. The problem was how to perform these easily and in a short time to reduce the price of the fittings.

 The present invention has been made in view of the above problems, and it is possible to easily manufacture joint fittings to reduce the price, and to manufacture various sizes while suppressing equipment costs for manufacturing as much as possible. An object is to provide a joint fitting of a possible segment.

 In order to achieve the above object, the present invention proposes the following means. That is, the present invention is a fitting for joining adjacent segments, and is fitted to a female joint disposed in the vicinity of the joining surface of the segments and the female joint disposed opposite to the adjacent segments. And a male joint for connecting these female joints. These female joints and / or male joints have a laminated structure of thin plates.

  According to the fitting according to the present invention, the female fitting and / or the male fitting is manufactured by laminating thin plates. Therefore, the fitting can be easily obtained by producing and laminating the thin plates by pressing or the like. Can be manufactured. Further, according to this production, it is possible to manufacture in a short time since no melting / solidification time is required unlike casting. Also, by increasing / decreasing the number of layers, the strength can be increased / decreased according to the application and size of the fittings, so there is no need to prepare various types of molds and manufacture various types of fittings. , Equipment costs can be minimized.

  In the fitting according to the present invention, the female joint includes a block having a laminated structure of thin plates and a locking portion for locking the male joint, and the male joint has a main body having a laminated structure of thin plates; And a flange for engaging the female joint. According to this, since the laminated structure of thin plates can be manufactured by pressing or the like, the joint fitting can be manufactured in a short time and at low cost.

 In the joint fitting of the present invention, a through hole is provided in the thin plate of the male joint, and a flange for engaging with the female joint may be passed through the through hole. According to this, since the flange can be accurately positioned on the male joint, it can be firmly and reliably joined to the female joint to be engaged. Moreover, since the through hole is provided in advance by press working or the like when manufacturing the thin plate, the through hole can be formed simply by laminating these thin plates, and the through hole is processed from the thick plate state. Compared with machining accuracy, machining time is shortened. Further, since the flange is supported by the inner surface of the through hole, the strength of the flange is increased, and the strength is sufficiently secured while suppressing the number of welding points for fixing the flange as small as possible. Therefore, it is not necessary to firmly weld the flange, and the manufacturing time can be shortened. Further, since the strength is increased, application to a heavy structure is also possible.

  In the joint fitting of the present invention, a steel bar may be provided instead of the flange. According to this, since the segment is engaged with and joined to the female joint by the steel bar of the male joint, the material cost for manufacturing the male joint can be further reduced.

 In the joint fitting of the present invention, the female joint may be welded with an anchor bar extending into the segment. According to this, since the anchor bars necessary for securing the joint strength between the female joint and the segment can be easily attached to the female joint, it is necessary to perform threading for screwing as in the prior art. No time and cost for production can be reduced.

  In the joint fitting of the present invention, the female joint is provided with a notch portion for locking the anchor bar, and the anchor bar may be formed in a U shape or an L shape. According to this, since the anchor bar is locked and fixed to the notch part of the female joint, the notch part is effective for the tensile stress that the anchor bar receives from the female joint when joining the segments. Take it. Therefore, the joint strength between the female joint and the anchor bar can be further improved.

  In the joint fitting of the present invention, the female joint is provided with a through hole for locking the anchor bar, and the anchor bar may be formed in a U shape or an L shape. According to this, since the anchor bar is locked and fixed to the through hole of the female joint, the through hole effectively absorbs the tensile stress that the anchor bar receives from the female joint when joining the segments. Take it. Therefore, the joint strength between the female joint and the anchor bar can be further improved.

 In the joint fitting of the present invention, an anchor portion extending into the segment may be integrally formed on the thin plate of the female joint. By laminating these thin plates to form a block, using this block to form a female joint and placing it in the segment, the anchor portion that protrudes into this segment will firmly hold this female joint in the segment. To fix. According to this, it is not necessary to weld the anchor bar to the female joint, and the anchor portion is formed simultaneously with the press working or the like when manufacturing the thin plate, so no special processing step is required. Productivity can be improved.

 According to the fitting according to the present invention, it is possible to provide a segment fitting that can be manufactured in various sizes while reducing the cost by simplifying the production of the fitting and minimizing the equipment cost. can do.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a schematic cross-sectional view showing a joint fitting according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, FIG. 3 is a plan view showing a female joint, and FIG. FIG. 5 is a perspective view showing a male joint, and FIGS. 6 and 7 are schematic cross-sectional views showing a joint metal fitting procedure. 8 is a perspective view showing a modification of the male joint, FIGS. 9 to 12 are views showing a modification of the female joint and the anchor bar, and FIG. 13 is a front view showing a modification of the thin plate of the female joint. It is.

 1 and 2, a segment 1 is a concrete segment 1 formed in a rectangular shape in a plan view and a circular arc shape in a side view, and the joint surfaces 2 at the end portions in the circumferential direction of the adjacent segments 1 are connected to each other. By joining, the ring which comprises a cylindrical wall body in an excavation hole is constructed | assembled. In FIG. 1, an arrow C indicates the circumferential direction of the ring, and an arrow O indicates the axial direction of the cylindrical wall body. The left side in the axial direction O in FIG. 1 indicates the face side that is the excavation side where the shield machine or the like is disposed, and the right side in the axial direction O indicates the wellhead side that is the tunnel entrance side.

 Two pairs of joint fittings 10 are provided in the vicinity of the joint surface 2 so as to be separated from each other in the axial direction O, and are respectively formed as a well-side joint fitting 10a and a face-side joint fitting (not shown). These two pairs of fittings are formed on the joint surface 2 with the same structure. A joint fitting 10 shown in FIG. 1 is a pair of wellhead side joint fittings 10a, and a face side joint fitting (not shown) having the same structure as this pair is provided on the face side in the axial direction O so as to be separated.

 These two pairs of fittings are provided, and the adjacent segments 1 are sequentially joined to the existing cylindrical wall body toward the wellhead side in the axial direction O, thereby forming a ring, A wall-like body is being constructed. Moreover, the arrow D in FIG. 2 has shown the radial direction of this cylindrical wall body.

 As shown in FIG. 1, the joint fitting 10 (10 a) connects a pair of female joints 20 embedded in concrete on the side of each joint surface 2 of adjacent segments 1 and these female joints 20. And a male joint 30 for the purpose.

 As shown in FIG. 1 and FIG. 2, in the pair of female joints 20, the female joint of one segment 1 is a leading female joint 20a, and the female joint of the other segment 1 is a fitting-side female joint. The mold joint 20b is used. Each of the female joints 20a, 20b has a C-shaped cross section and extends in a cylindrical shape in the axial direction O, and is spaced apart in the longitudinal direction of the locking portion 21 so as to wrap around the outer peripheral side of the locking portion 21. And two blocks 22 having a C-shaped cross section. These female joints 20a and 20b are arranged slightly inclined with respect to the joint surface 2 as shown in FIG.

 As shown in FIG. 2, the locking portion 21 has a locking surface 21 a on the inner peripheral surface on the opening side of the C-shaped cross section. As shown in FIG. 1, the locking surface 21 a is inclined with respect to the joint surface 2 and disposed in the segment 1. The inclination of the locking surface 21a is set to 1/20 with respect to the joint surface 2. Further, as shown in FIGS. 2 to 4, two nuts 23 are provided in the longitudinal direction of the locking portion 21 on the outer surface of the bottom surface 21 b on the side opposite to the opening side of the locking portion 21 having the C-shaped cross section. They are spaced apart and fixed. On the bottom surface 21b, through holes 21c are provided at positions where the nuts 23 are fixed. These nuts 23 are provided to engage the bolts extending from the mold when the segment 1 is manufactured, position and fix the female joint 20 in the mold with high accuracy, and place concrete.

 The space formed on the inner peripheral side of the C-shaped cross section of the locking portion 21 is an engagement space 21d. The engagement space 21d is opened at one end in the longitudinal direction to form an opening 21e, and the other end is closed to form a closed portion 21f. Further, as shown in FIG. 2, the locking portion 21 is embedded in the segment 1 in a state where the opening side of the C-shaped cross section faces the joining surface 2 and the engagement space 21 d and the joining surface 2 are communicated with each other. Has been.

 As shown in FIGS. 2 to 4, the block 22 is formed by laminating a plurality of C-shaped thin plates 22 a in the longitudinal direction of the locking portion 21 and joining them together. In the present embodiment, for example, two blocks 22 each having a thickness of 27 mm are provided by stacking six thin plates 22 a having a thickness of 4.5 mm. The block 22 is disposed and fixed to the locking portion 21 so as to be in contact with the outer surface of the two separated nuts 23. The positions where these blocks 22 are arranged are arranged so that they are located near both ends of the flange 31 when the female joint 20 is fitted to a flange 31 of a male joint 30 described later.

 The locking portion 21 is manufactured by using an extruded material having a C-shaped cross section or by bendering a steel plate. The block 22 is manufactured by laminating thin plates 22a manufactured by pressing steel plates. And the latching | locking part 21 and the block 22 are mutually joined by welding. Further, as shown in FIG. 2, the block 22 is provided with anchor bars 24 made of steel bars on both end surfaces on the outer side in the radial direction D along the longitudinal direction in which these end surfaces are formed. It extends in. The block 22 and the anchor bar 24 are welded and joined to each other. By means of the anchor bars 24, the female joint 20 is firmly fixed to the concrete constituting the segment 1.

 In the state where the respective female joints 20a and 20b are embedded in the segment 1, as shown in FIG. 1, a hole-like insertion port 3 for inserting the male joint 30 is opened in the joint surface 2. It is formed and is arranged near the opening 21e. The insertion port 3 and the engagement space 21d communicate with each other through the opening 21e.

 On the other hand, as shown in FIG. 5, the male joint 30 is formed by laminating a plurality of rectangular thin plates 30a and joining them together. In the present embodiment, for example, four thin plates 30a having a thickness of 4.5 mm are stacked to form a thickness of 18 mm. Each thin plate 30a has two rectangular through-holes 30b formed at the same location, and these through-holes 30b communicate with each other in a stacked state. The two through holes 30b are formed to be inclined so as to gradually approach each other from the one side end face 30c of the thin plate 30a toward the other side end face 30d.

 Further, flanges 31 each having a rectangular parallelepiped shape are fitted into the two through holes 30b. The flange 31 has substantially the same cross-sectional shape as the through hole 30 b, is fitted into the through hole 30 b, and is joined by spot welding 32. Further, the flange 31 is disposed in the through hole 30b with protruding ear portions 31a having substantially equal lengths on one side and the other side in the through direction. The inner surfaces of the ear portions 31a facing each other of these two flanges 31 are engaging surfaces 31b. These engaging surfaces 31b are formed to be symmetrical with each other so as to be symmetric, and the inclination gradient is set to 1/20.

 As shown in FIG. 5, a reaction force application member 33 is disposed below the side end face 30d so as to extend in a direction substantially perpendicular to the side end face 30d. This reaction force imparting member 33 is formed by fitting a round bar made of a soft material such as lead into the inside of a cylindrical body made of a steel pipe or the like, and is formed on the side end face 30d of the cylindrical body. When a pressing force is applied from the end on the opposite side to the side end surface 30d, a reaction force can be applied to the pressing force.

 Further, another pair of face side joint fittings (not shown) formed on the same joint surface 2 as the pair of joint fittings 10 (10a) is also formed with the same structure as the joint fitting 10 (10a), It is spaced apart on the face side in the axial direction O.

 Next, the joining of the segments 1 using the joint fitting 10 configured as described above will be described. In order to join the adjacent segments 1 to each other, first, as shown in FIG. 6, one flange 31 arranged on the side close to the reaction force applying member 33 of the male joint 30 in advance in one segment 1, The reaction force applying member 33 is inserted into the insertion port 3 so as to face the closing portion 21f. And this flange 31 is moved to the vicinity of the center in the longitudinal direction of the engagement space 21d of the front female joint 20a and arranged. Then, the other flange 31 of the male joint 30 is disposed so as to protrude outward from the joint surface 2.

 Next, as shown in FIG. 7, the other flange 31 protruding outward is inserted into the insertion port 3 of the other segment 1, and the joining surfaces 2 of the respective segments 1 are butted together. In this state, when the other segment 1 is moved to the wellhead side in the axial direction O (the right side in FIG. 7), the flange 31 inserted into the insertion port 3 of the other segment 1 is moved to the other segment 1. It is made to arrange | position to the engagement space 21d of the fitting side female joint 20b arrange | positioned. Then, when the other segment 1 is moved until it comes into contact with a cylindrical wall body (not shown) provided on the wellhead side, as shown in FIG. 1, the leading side female joint 20a and the fitting side female joint 20b Are arranged opposite to each other with the joint surface 2 interposed therebetween.

 At the time of this joining, the male joint 30 is pushed by the end opposite to the side end face 30d of the reaction force application member 33 being in contact with the inner surface of the closing part 21f of the front female joint 20a. Since it receives pressure and takes a reaction force on this surface, it is stably placed in the engagement space 21d and is pushed into the pair of female joints 20a and 20b in a well-balanced manner.

 As shown in FIG. 1, the two flanges 31 are fitted in the respective engagement spaces 21 d to connect the pair of female joints 20 a and 20 b, and the locking surfaces 21 a of the respective locking portions 21. The engaging surface 31b is engaged with the. Since the respective engaging surfaces 21a and engaging surfaces 31b have the same gradient, the female joints 20a and 20b are attracted to each other and the segments 1 are connected to each other while the engagement is firmly performed between the surfaces. Are to be joined.

 In addition, although this joining was demonstrated using the well-end side joint metal fitting 10a, it is supposed that it is performed by the same procedure simultaneously with this well-end side joint metal fitting 10a also about the joining of the face side joint metal fitting not shown. These joint fittings cooperate to join adjacent segments 1 to each other.

  According to the joint fitting 10 of the embodiment of the present invention, the block 22 of the female joint 20 is manufactured by laminating a plurality of thin plates 22a and joining them together, and the male joint 30 has a main body portion. It is formed by a laminated structure of thin plates 30a and is manufactured by joining them together. Therefore, these fittings 10 can be easily manufactured by manufacturing and laminating these thin plates 22a and 30a by press working or the like. Further, according to this production, it is not necessary to have a time for melting and solidifying by casting as in the prior art, so that it can be produced in a short time. Also, by increasing / decreasing the number of layers, the strength can be increased / decreased according to the application and size of the joint fitting 10, so it is necessary to prepare various types of molds and produce various types of joint fittings as before. The equipment cost can be kept as low as possible.

 Further, each of the plurality of thin plates 30a of the male joint 30 is provided with a through hole 30b, and the flange 31 is fitted and disposed in the through hole 30b. Therefore, the flange 31 is attached to the male joint 30 with high accuracy. It can be positioned and can be firmly and securely joined to the female joint 20 to be engaged. Further, since the through hole 30b is provided in advance by press working or the like when manufacturing the thin plate 30a, the through hole 30b can be formed simply by laminating these thin plates 30a. Compared to machining, machining accuracy is improved and machining time is shortened.

 Further, in order to support the flange 31 on the inner surface of the through hole 30b, the flange 31 may be spot welded to such an extent that the flange 31 is not moved in the penetrating direction. Sufficiently secured. Therefore, the manufacturing time of the male joint 30 can be shortened, and the strength is increased, so that it can be applied to a heavy structure.

 Further, since the anchor joint 24 extending into the segment 1 is welded and joined to the female joint 20, there is no need to perform threading for screwing as in the prior art, and the anchor joint 24 is connected to the female joint 20. 20 can be easily attached, and the time and cost required for production can be reduced.

 As described above, according to the joint fitting 10 of the segment 1 in the present embodiment, it is possible to manufacture various sizes while simplifying the manufacturing to reduce the price and minimizing the equipment cost. Is possible.

 The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the present embodiment, the flange 31 is passed through the male joint 30, but the present invention is not limited to this as long as it can be engaged with the pair of female joints 20. FIG. 8 shows a first modification of the present embodiment, in which a plurality of round bars 34 having the same diameter are used instead of the flange 31. Then, the axes of these round bars 34 are arranged on the same straight line, these straight lines are inclined so as to have the same gradient as the engaging surface 31b, and the shape of the through hole is a round hole 30e. 34 is fitted and joined and fixed. Further, the steel bar is not limited to the round steel bar 34, and a bar steel having another shape such as a square steel or an elliptical steel may be used. According to this, the material cost for manufacturing the male joint 30 can be further reduced.

  Moreover, what is shown in FIG.9 and FIG.10 is the 2nd modification of this embodiment, the notch part 25 is provided in the block 22 of the female coupling 20, and the anchor reinforcement | strength 24a is made into U shape like a figure. It is formed and locked to the notch 25, and these are fixed to each other. According to this, since the anchor bar 24a is locked and fixed to the notch 25, the notch 25 receives the tensile stress that the anchor bar 24a receives from the female joint 20 when the segment 1 is joined. Take it effectively. Therefore, the joint strength between the female joint 20 and the anchor muscle 24a can be further improved. In the second modification, the anchor bars 24a may be formed in an L shape.

  FIG. 11 and FIG. 12 show a third modification of the present embodiment. A plurality of through holes 26 are provided through the block 22 of the female joint 20 in the laminating direction of the thin plates 22a. L-shaped anchor bars 24b are respectively inserted into the through holes 26 and fixed to each other. Here, the direction in which the anchor muscles 24b are penetrated is preferably arranged so as to alternately change the direction from one to the other, or from the other to the other. According to this, since the anchor bar 24b is locked and fixed to the through hole 26, the through hole 26 is effective for the tensile stress that the anchor bar 24b receives from the female joint 20 when the segment 1 is joined. Take it. Therefore, the joint strength between the female joint 20 and the anchor bar 24b can be further improved. Further, since these anchor bars 24b are arranged so as to alternately change their orientations, the tensile stress is evenly received and the joint strength is further increased. In this third modification, the anchor bars 24b may be bent after being inserted into the through holes 26 and formed into a U shape.

 FIG. 13 shows a fourth modification of the present embodiment. The thin plate 22a is formed in a substantially Y shape as shown in the figure, and protrudes from a substantially C-shaped engagement main body portion 22b. An anchor portion 22c extending in the direction is provided. And if these thin plates 22a are laminated | stacked, the block 22 is formed, and if the female coupling 20 is formed using this block 22 and it arrange | positions in the segment 1, the anchor part 22c which protrudes in this segment 1 will be extended, The female joint 20 is firmly fixed in the segment 1. According to the fourth modified example, it is not necessary to weld the anchor bar to the female joint 20, and the anchor portion 22c is formed simultaneously with the press working or the like when the thin plate 22a is manufactured, so that a special processing step is required. Therefore, the productivity of the female joint 20 can be improved.

 In the present embodiment, the two blocks 22 of the female joint 20 are spaced apart from each other in the longitudinal direction of the locking portion 21. However, the present invention is not limited to this, and three or more blocks 22 are spaced apart. Alternatively, as shown in FIG. 9 and FIG. 11, the number of the blocks 22 may be increased by increasing the number of the thin plates 22a to be stacked.

 In the present embodiment, the reaction force application member 33 is formed so as to fit a round bar made of a soft material such as lead inside a cylindrical body made of a steel pipe or the like. For example, an elastic member made of a spring member or the like is incorporated in the tube of two bottomed cylindrical bodies to be fitted, and the reaction force is generated by the urging force of the elastic member. You may comprise so that it may give. Moreover, you may comprise so that two cylindrical bodies which consist of a steel pipe etc. may be fitted by interference fit, and reaction force may be provided.

 In the present embodiment, the segment 1 is made of concrete. However, the present invention is not limited to this. For example, the present invention may be applied to various segments such as a ductile segment, a steel segment, and a composite segment of ductile and concrete. Moreover, the material of the joint metal fitting 10 should just be a material which can be joined by welding etc., and the material is not limited.

  In the above-described embodiment, the laminated structure of thin plates is adopted for both the male joint 30 and the female joint 20, but this laminated structure may be adopted for only one of them.

It is a schematic sectional drawing which shows the coupling metal fitting which concerns on one Embodiment of this invention. It is the II-II sectional view taken on the line in FIG. It is a top view which shows a female type | mold joint. It is a side view which shows a female type | mold joint. It is a perspective view which shows a male type | mold joint. It is a schematic sectional drawing which shows the joining procedure of a coupling metal fitting. It is a schematic sectional drawing which shows the joining procedure of a coupling metal fitting. It is a perspective view which shows the modification of a male type | mold joint. It is a side view which shows the modification of a female type | mold joint and an anchor muscle. It is a front view which shows the modification of a female type | mold joint and an anchor muscle. It is a side view which shows the modification of a female type | mold joint and an anchor muscle. It is a front view which shows the modification of a female type | mold joint and an anchor muscle. It is a front view which shows the modification of the thin plate of a female type | mold joint.

Explanation of symbols

1 segment 2 joint surface 10 joint fitting 20 female joint 21 locking part 22 block 22a thin plate 22c anchor part 24 anchor bar 24a anchor bar 24b anchor bar 25 notch part 26 through hole 30 male joint 30a thin board 30b through hole 31 flange 34 Round steel

Claims (8)

A joint fitting for joining adjacent segments,
A female joint disposed in the vicinity of the joint surface of the segment, and a male joint that is fitted to the female joint disposed opposite to each adjacent segment to connect the female joints,
These female fittings and / or male fittings have a laminated structure of thin plates. The female joint includes a block having a laminated structure of the thin plates, and a locking portion for locking the male joint,
The joint fitting according to claim 1, wherein the male joint includes a main body having a laminated structure of the thin plates, and a flange for engaging the female joint. A through hole is provided in the thin plate of the male joint,
The joint fitting according to claim 2, wherein the flange is passed through the through hole.   The fitting according to claim 2 or 3, wherein a steel bar is provided instead of the flange.   The joint fitting according to any one of claims 1 to 4, wherein an anchor bar extending into the segment is welded to the female joint. The female joint is provided with a notch for locking the anchor muscle,
The joint fitting according to claim 5, wherein the anchor bar is formed in a U shape or an L shape. The female joint is provided with a through hole for locking the anchor muscle,
The joint fitting according to claim 5, wherein the anchor bar is formed in a U shape or an L shape.  The joint fitting according to any one of claims 1 to 4, wherein an anchor portion extending into a segment is integrally formed on the thin plate of the female joint.

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