JP3946501B2 - Precast member joint and precast member provided with the joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a precast member such as a tunnel lining segment, a lining plate, a paving plate, or a wall for a storage tank, for improving the efficiency of joining work, improving workability, making the precast member surface free of defects and making it economical. The present invention relates to a joint structure and a precast member including the joint.
[0002]
[Prior art]
Conventionally, the segment connection method used in the shield method is often coupled by bolts. For this reason, it takes time to align the bolts, the bolts need to be tightened, the hardware is exposed and rust prevention is required, the segment inner surface is not smooth (the joint box opens on the inner surface side, etc.) Therefore, there is a disadvantage that secondary lining is necessary.
[0003]
On the other hand, various joint structures have been developed in which the joint is embedded in the segment body, the inner surface is smoothed and the secondary lining can be omitted, and bolt joining is not required, and the assembly is automated and labor-saving. Yes.
[0004]
For example, in Japanese Patent Laid-Open No. 2000-248898, a bar-shaped male joint projecting from a joint surface is provided with an enormous portion and a neck constriction, fitted to a female joint that opens to the joint surface, and an engagement provided on the female joint. A joint structure is described in which the claws are engaged with the enormous portion of the male joint.
[0005]
In this joint structure, the engaging claws biased by the spring are provided so as to be able to advance and retreat into the engaging cylinder of the female joint from the direction perpendicular to the insertion direction of the male joint, and the male joint is inserted while pushing back the engaging claws. After that, the engaging claw is fitted into the constricted portion under the neck, and is engaged with the enormous portion of the male joint.
[0006]
For the manufacturing errors of precast members such as segments, misalignment of male and female joints due to construction errors, gaps between precast members, and backlash, a slight gap is provided in the male joint insertion direction between multiple engaging claws. A structure that can be dealt with by shifting a proper engagement position by a predetermined amount is described.
[0007]
Japanese Patent Application Laid-Open No. 8-296396 discloses a structure in which a rod-shaped male joint protruding from a joint surface is fitted to a female joint opened to the joint surface, and the male joint has a tapered guide portion and a guide portion facing backward from the guide portion. A locking portion consisting of a tapered surface that is reduced in diameter is formed, and a tapered hole is formed in the female joint to increase the diameter in the insertion direction of the male joint, and the insertion direction of the male joint is set with a spring on the inner peripheral surface of the tapered hole. By arranging a plurality of wedge plate groups biased in opposite directions and inserting the male joint into the female joint, the plurality of wedge plates engage between the tapered surface of the male joint and the tapered hole of the female joint. Thus, a structure that resists the pulling force acting on the joint is described.
[0008]
In addition, there is described a structure that can cope with misalignment of male and female joints, etc., with the clearance of the through hole of the fixing bracket that fixes the male joint with a nut and the spring washer that is elastically deformed by tightening the nut. ing.
[0009]
Similarly, in Japanese Patent Laid-Open No. 2001-90485, in a structure in which a rod-shaped male joint protruding from a joint surface is fitted to a female joint opened to the joint surface, a guide taper portion is provided at the tip of the male joint. A pair of engagement members formed with a reduced diameter portion behind the taper portion and capable of rotating by engagement of the sliding concave portion and the sliding convex portion at one end in the housing formed inside the cylindrical female joint. After the stop member and these locking members are sandwiched from the outside, a plate spring that urges inward is incorporated, and after the tapered portion of the male joint is inserted in resistance to the urging force of the plate spring, the reduced diameter portion of the male joint A structure is described in which a pair of locking members urged inward by the urging force of the leaf spring is held between the two members to resist the pulling force acting on the joint.
[0010]
[Problems to be solved by the invention]
In the case of the joint structure described in Japanese Patent Laid-Open No. 2000-248898, it is possible to deal with manufacturing errors and assembly errors by providing a gap between the positions of the engaging claws. There are advantages that workability is improved, roundness is easily ensured, and water stoppage at the joint position can be secured.
[0011]
However, since the space for storing the engaging claws and springs extends greatly in the radial direction of the female joint, the dimensions of the female joint as a whole, especially the diameter, increase, and the female and engaging claws can be accommodated respectively. There is a problem that the manufacturing cost of the joint is high.
[0012]
In addition, since the diameter of the female joint head is increased, problems with dimensional constraints such as contact with a water-stopping material and the like attached to the joint surface, and covering with concrete arise.
[0013]
The joint structure described in Japanese Patent Laid-Open No. 8-296396 has a structure that absorbs manufacturing errors and assembly errors mainly on the male joint side, but if there is misalignment when the male joint is inserted into the female joint, the wedge plate group Do not engage uniformly, and there is a possibility of causing play such as positional displacement between the wedge plates.
[0014]
In addition, error absorption on the male joint side is performed by a through hole or a spring washer through which the nut is passed in connection with tightening of the nut, so there is a problem of loosening of the nut and a large cross-section fixing bracket is required on the male joint side. Thus, there are disadvantages such as the problem of dimensional constraints on the male joint side.
[0015]
The joint structure described in Japanese Patent Laid-Open No. 2001-90485 is a structure in which a pair of locking members are opened and closed using the biasing force of a leaf spring, and the reduced diameter portion of the male joint is clamped. Since the joint is point-contacted in a cross section perpendicular to the axial direction of the male joint, it is difficult to obtain a sufficient clamping force, and there is a drawback in that the joint is liable to be loosened and the axial displacement cannot be dealt with.
[0016]
In addition, the misalignment between male and female joints can be fitted to some extent due to backlash, but strong fastening cannot be expected, ensuring roundness when applied to tunnel lining, etc. It is difficult to ensure water-stopping.
[0017]
The present invention is intended to eliminate the drawbacks of the prior art as described above, and can easily cope with manufacturing errors and assembly errors while ensuring a compact structure with no dimensional constraints, and can securely connect male and female joints. Provided is a precast member joint excellent in workability and economy that can sufficiently resist pull-out force and shearing force on the joint surface, and a precast member provided with the joint, and the segment of the segment used by the precast member for the shield method In some cases, it is an object to provide a joint structure that is advantageous for earthquakes by increasing the tensile deformation capacity of the joint as necessary.
[0018]
[Means for Solving the Problems]
  In the joint of the precast member according to claim 1 of the present application, the male joint provided at the joint position of one precast member to be joined is fitted and joined to the female joint provided at the joint position of the other precast member. In the joint of the precast member, the male joint has a rod-like protrusion that protrudes from the joint surface of the one precast member, a reduced diameter portion is formed on the outer peripheral surface of the protrusion, and the female joint is The male joint has a cylindrical head that opens into the joint surface of the other precast member, and the protruding portion of the male joint is fitted into an inner hollow portion. An annular groove is formed at a position corresponding to the reduced diameter portion in a state where the portion is fitted, and the annular groove has an inner diameter in a contracted state smaller than the outer diameter of the protruding portion of the male joint, Annular elasticity that can elastically expand and contract It is mounted woodThe annular elastic member is an annular spring in which both ends of the coil spring are annularly connected.It is characterized by this.
[0019]
The joint of the present invention is an automatic joint type joint in which a male / female joint is embedded in a segment body, and basically, the joining of the joints of the precast members can be completed only by pressing the precast member.
[0020]
In the joint of the present invention, when the male joint is inserted into the female joint, the male joint basically enters while expanding the annular elastic member mounted in the annular groove of the female joint in the radial direction, and further enters. The annular elastic member fits into the reduced diameter part of the male joint by going, and the annular elastic member has a structure that resists the pulling force by straddling the annular groove of the female joint and the reduced diameter part of the male joint. .
[0021]
  As described above, in the case of the conventional automatic joint, a large space extending in the joint radial direction for connecting the male and female joints is required, and the problem of dimensional constraints, etc. has occurred.Is a ringElastic memberUsing an annular spring that has a predetermined performance while maintaining the cross-sectional shape and can be manufactured relatively inexpensively,Since the resistor itself is a tensile load resistor applied to the joint, the structure is simple, and the joint is compact and economical.
  As the material of the annular spring, spring steel such as spring steel, hard steel wire, piano wire, and stainless steel wire for spring, or engineering plastics can be used. Join and form the whole into an annular shape.
[0022]
As materials for the male joint and the female joint, those made of metal, reinforced plastic, ceramics, etc. can be used, and other materials having the required strength are not particularly limited.
[0023]
A second aspect of the present invention is the case of the joint of the precast member according to the first aspect, wherein the reduced diameter portion of the male joint and the annular groove of the female joint are each provided in two or more stages.
[0024]
According to a third aspect of the present invention, in the joint of the precast member according to the second aspect, a predetermined gap amount is provided between the interval between the reduced diameter portions and the interval between the annular grooves.
[0025]
Later, as will be described in detail in the section of the embodiment of the present invention, in the case of providing a plurality of reduced diameter portions and annular grooves, by setting a set gap amount in consideration of a segment manufacturing error, an assembly error, etc. At least one of the annular elastic members attached to the annular groove is brought into close contact with the reduced diameter portion of the male joint and reliably engaged, and can exert a large resistance against a pulling force or the like.
[0029]
  Claim4Claims1, 2 or 3In the precast member joint according to the present invention, a core material obtained by dividing a ring into a plurality of coils is inserted in the coil of the annular spring.
[0030]
If the cross-section of the wire forming the coil spring is large or the material is hard, the annular spring itself can resist the pulling force acting on the joint, but the cross-section of the wire can be increased in order to improve the radial expansion / contraction performance. If it is small or the material is relatively soft, the annular spring will be deformed by the pulling force, and the pulling deformation amount will be excessive even if it is detached from the annular groove of the female joint or the reduced diameter part of the male joint. there is a possibility.
[0031]
In such a case, by inserting a core material having a predetermined strength into the coil, the core material can resist and prevent the annular spring from coming off. The reason for dividing the core material into a plurality is to cope with expansion and contraction of the annular spring.
[0032]
In order to increase resistance to the pulling force acting on the joint, it is desirable that the inner diameter of the coil and the diameter of the core are substantially equal, but in consideration of earthquake resistance, slight displacement between precast members during an earthquake is allowed. In some cases, it is also effective to provide a slight gap (for example, 1 to 2 mm) between the inner diameter of the coil and the outer diameter of the core material.
[0033]
  Claim5Claims 1 and 2Or 3In the joint of the precast member according to the present invention, a shear for resisting a shear force acting on the annular elastic member in the joint fitting direction on the outer periphery of the cross section of the annular elastic memberresistanceThis is a case where a plurality of members are intermittently attached along the circumferential direction.
[0034]
  This shearresistanceThe function of the member is claimed4The core material is substantially the same as the core material in FIG. 1, except that the core material is housed in the cross section of the coil spring, whereas the core material is mounted outside the cross section of the annular elastic member. In this case, the entire circumference of the annular elastic member may be surrounded. For example, only a part that engages with the inner diameter side of the annular elastic member as shown in FIG. 12 described later in the section of the embodiment of the invention. It may be installed in.
[0035]
Also in this case, as in the case of the core material, the annular elastic member can be expanded and contracted by dividing into a plurality along the circumferential direction. Moreover, since it mounts on the outer side of the cross section, the annular elastic member to be mounted is not limited to a hollow section like the annular spring.
[0036]
  Claim6Are claims 1 to5In the joint of the precast member according to any one of the above, the annular elastic member is held in a state in which the diameter of the annular elastic member has been expanded by a predetermined amount on the inner diameter side of the annular elastic member, and the protruding portion of the male joint is inserted. This is a case where an annular diameter expanding holder that is pushed forward in the joint fitting direction is attached.
[0037]
As described above, in the joint according to the present invention, basically, when the male joint is inserted into the female joint, the male joint enters while radially expanding the annular elastic member mounted in the annular groove of the female joint. However, when the male joint pushes the annular elastic member radially in the radial direction, the rigidity or deformation performance of the annular elastic member is increased. Depending on the case, there is a possibility that the annular elastic member is detached from the annular groove.
[0038]
  Therefore, the claim6In the invention according to the present invention, the annular elastic member is held in a state where the diameter of the annular elastic member has been expanded in advance by the diameter expansion holder, and the male joint pushes the diameter expansion holder toward the back side of the female joint so that the ring elastic member becomes the diameter expansion holder. So that it enters the reduced diameter part of the male joint. In this case, strictly speaking, a case in which the male joint pushes in only the diameter expanding holder without expanding the diameter of the annular elastic member is included.
[0039]
In the case where the annular elastic member has one stage, the diameter expanding holder is usually one, but in the case where the annular elastic member has a plurality of stages (usually up to two stages), one or a plurality are used. The case where the annular elastic member is expanded and held is also included.
[0040]
The material is not particularly limited, such as metal, plastic, wood, etc. If there is room on the back side of the female joint, it may be pushed into the back side of the female joint, and if there is no space available It may be crushed by insertion of a male joint.
[0041]
  Claim7The precast member according to claim 1 is provided on the joint surface.6A plurality of the male joints or female joints of the joint of the precast member according to any one of the above are installed.
[0042]
As a precast member, the present invention mainly targets a segment for a shield method, but is not limited thereto, a reinforced concrete structure, a steel reinforced concrete structure, a steel concrete composite structure, a steel structure filled with concrete, a spheroidal graphite cast iron structure, and the like It can be applied to precast members having various structures and various uses.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described by taking a reinforced concrete segment (hereinafter referred to as “segment”) for the shield method shown in FIG. 1 and FIG.
(1) Overall structure
As shown in FIG. 1, the segment 1 as a precast member is connected to the male joint 11 and the female joint 21 as inter-ring joints connecting the segments 1 in the tunnel axial direction, and the segment connecting the segments 1 in the tunnel circumferential direction. A male joint 31 and a female joint 41 as an inter-joint are embedded, and the inner surface of the segment 1 is smooth without a missing portion such as a bolt box.
[0044]
In addition, the joint of the precast member used as the object of this invention consists of the male joint 11 and the female joint 21 as a joint between rings in this embodiment.
[0045]
The assembly of segment 1 can be fastened only by pressing the new segment 1a against the existing segment 1 with an erector and shield jack, so there is no need for fastening with bolts, etc., making the joining work more efficient and improving workability In addition to improving work safety, it is also possible to improve economy because it is not necessary to fill the bolt box (see FIG. 2).
(2) Male joint 11
As shown in FIG. 3, the male joint 11 includes an anchor portion 12 embedded in the segment 1 and a protruding portion 13 protruding from the side surface (joint surface) of the segment 1, and the protruding portion 13 has one stage (not shown). Alternatively, a two-stage reduced diameter portion 14 is formed as illustrated. Further, the tip of the protruding portion 13 is processed into a tapered shape so that the centering can be smoothly performed (see FIG. 4).
[0046]
The illustrated male joint 11 is an example in which the tip of the deformed reinforcing bar is machined, but may be made of metal such as casting or forging, or made of reinforced plastic or ceramics.
[0047]
In the example shown in the figure, since the resistance force to the tensile force is expected from the adhesion force between the deformed reinforcing bar and the concrete, the concrete embedding portion as the anchor portion 12 has a rod shape with the same cross section, but it is obtained by casting, forging, etc. In the case of metal, reinforced plastic, ceramics, or the like, an enormous portion can be formed as in the illustrated rear end portion of the female joint 21 to ensure pulling resistance.
(3) Female joint 21
As shown in FIG. 3, the female joint 21 is embedded with the anchor portion 22 so that the head portion 23 is located on the side surface of the segment 1, so that the protruding portion 13 of the male joint 11 can be coupled to the head portion 23. It has a hollow cylindrical shape that opens on the side of the segment 1.
[0048]
As with the male joint 11, the female joint 21 may be made of metal by casting or forging, reinforced plastic, ceramics, or the like.
[0049]
When the male joint 11 enters and joins the female joint 21, a corresponding number of annular grooves 24 are formed at positions corresponding to the reduced diameter portions 14 of the male joint 11. An annular spring 25 as an elastic member is set (see FIG. 4).
[0050]
When the reduced diameter portion 14 of the male joint 11 has two stages, the relationship between the interval between the reduced diameter portions 14 and the interval of the annular groove 24 of the female joint 21 can be determined as follows, for example.
[0051]
That is, in FIG. 7 (case 1) and FIG. 8 (case 2), the distance from the segment side surface (inter-ring joint surface) to the front end of the first reduced diameter portion 14a of the male joint 11 is L._m1, L is the distance from the side of the segment to the front end of the second reduced diameter portion 14b of the male joint._m2, L is the distance from the side of the segment to the back end of the first annular groove 24a of the female joint._f1, L is the distance from the side of the segment to the back end of the second annular groove 24b of the female joint._f2When
L_m1≒ L_f1If set to L_m2≒ L_f2+ G (Case 1)
L_m1≒ L_f1If + g is set, L_m2≒ L_f2-G (Case 2)
(Here, g is the set gap amount considering segment manufacturing error, assembly error, etc.)
Thus, even when there is a manufacturing error or an assembly error of the segment, the first locking portion (the first annular groove 24a and the first reduced diameter portion 14a) or the second without causing an excessive opening. Engagement can be ensured at any of the locking portions (second annular groove 24b and second reduced diameter portion 14b).
[0052]
That is, in the case of FIG. 7 (Case 1), when there is no or very little assembly error and the new segment can be abutted and joined to the existing segment, the first locking portion (see FIG. 7 (a)) causes the assembly error. Can be engaged with each other at the second locking portion (see FIG. 7B).
[0053]
Here, the saving fee g₁7 (a) to FIG. 7 (a), when the male joint 11 enters the female joint 21, an annular spring 25, which will be described later, is engaged with the second locking portion. A retreat space for preventing the entry, g₁It is desirable to set as ≈g. Further, the retraction allowance g at the second locking portion of the male joint 11₁The reason why the gentle slope is formed from the retracted position toward the side surface of the segment is that the male joint 11 is inserted into the first locking portion of the female joint 21 at the initial stage when the male joint 11 enters the female joint 21, which will be described later. When the annular spring 25 is once accommodated in the second engaging portion of the male joint 11 and subsequently the male joint 11 enters the female joint 21, the annular spring 25 moves over the gentle slope and finally the male joint. 11 to be accommodated in the first locking portion, so as to make the movement smooth.
[0054]
In the case of FIG. 8 (Case 2), when there is no or very little assembly error and the new segment can be abutted and joined to the existing segment, the second locking portion (see FIG. 8 (a)) causes an assembly error. Can be engaged with each other at the second locking portion (see FIG. 8B). Here, the retraction allowance g is added to the first locking portion of the male joint 11.₁Is provided for the same reason as in FIG. 7 (case 1).
[0055]
Thus, even if the penetration depth of the male joint 11 changes with respect to the female joint 21, any one of the annular springs 25 arranged in two stages engages with the reduced diameter portion 14 of the male joint 11. .
(4) Annular spring 25 (annular elastic member)
As an example of the annular elastic member set in the annular groove 24 of the female joint 21, an annular spring 25 can be used. In the example of FIG. 9, the coil spring is connected in an annular shape, and the core member 26 is provided in the coil cross section as necessary. Built-in.
[0056]
The annular spring 21 is provided in at least one stage and, if necessary, a plurality of stages according to the number of the annular grooves. As the material of the annular spring 21, spring steel such as spring steel, hard steel wire, piano wire, and stainless steel wire for spring, engineering plastics, and the like can be used. The cross-sectional shape is generally circular, but is not limited to this, and may be oval, rectangular, oval, or the like. Moreover, the cross-sectional shape of the wire used as the material of the annular spring 21 is not particularly limited, such as a circle or a rectangle.
[0057]
The core material 26 is used as necessary. When the male joint 11 is inserted into the female joint 21 or when a pulling force is applied to the joint portion, the annular spring 25 is greatly deformed and the female joint 21 is used. This is a member for preventing the annular groove 24 from being displaced or detached in some cases, and is made of a metal or other member having an appropriate rigidity.
[0058]
As a specific material of the core material 26, for example, a steel material for a spring such as a large-diameter iron wire, a spring steel, a hard steel wire, a piano wire, a stainless steel wire for a spring, ceramics, or the like can be used depending on the application. The cross-sectional shape can be selected from circular, elliptical, rectangular, oval, etc. according to the cross-sectional shape of the annular spring.
[0059]
The core member 26 is divided into several parts along the circumference of the annular spring 25, and is configured not to restrain the expansion and contraction associated with the diameter expansion and contraction of the annular spring 25. The cross sections of the annular spring 25 and the core member 26 are not limited to a circle as shown in FIGS. 13A to 13C, and may be an ellipse, a rectangle, an oval, or the like.
[0060]
Regarding the relationship between the inner dimension of the annular spring 25 and the outer dimension of the core material 26, it is considered that there is a case where it is almost in close contact and a case where an arbitrary (1-2 mm) clearance is provided. is there.
[0061]
That is, as shown in FIGS. 14A to 14C, the outer dimension of the core material 26 built in is slightly smaller than the inner dimension of the annular spring 25, and a clearance is provided between the spring and the core material 26. In the event of an earthquake, the effect of cushioning between the spring and the core material increases the joint's ability to absorb tensile deformation, absorbs displacement in the tunnel axis direction, and can respond to earthquakes.
[0062]
Alternatively, the core material 26 incorporated in the annular spring 25 can be omitted, and the tensile deformation absorption capacity of the joint portion can be enhanced by the cushioning effect (deformation of the cross section of the spring) of the spring to cope with an earthquake.
[0063]
Next, a method for manufacturing and assembling the annular spring 25 will be described.
In the example of FIG. 10, the annular spring 25 is processed into a linear coil spring having a required length, one end of the coil spring is squeezed and inserted into the other end in a state where it is screwed back by a required amount. The annular spring 25 is manufactured by connecting the ends by releasing and screwing in the return amount.
[0064]
In the example of FIG. 11, what was processed into the linear coil spring is couple | bonded using the screw fastening member 25a which formed the external thread screwed together to this coil spring.
[0065]
When the both ends of the annular spring 25 have a circular cross section as shown in FIG. 11, the screw fastening member 25a is screwed into one end of the annular spring 25 for the entire length of the screw, and the other end of the annular spring 25 is Can be coupled by a method in which the screw is unscrewed by approximately half the screw length, and the screw is unscrewed by the unscrewed amount.
[0066]
Alternatively, as another method, the screw fastening member 25a can be forcedly pushed into both ends of the annular spring 25 from the axial direction, and the coil spring can be connected while expanding the cross section of the coil spring. The latter method can be applied to an ellipse, a rectangle or an oval shape in which the cross section of the annular spring 25 is not circular. It is also possible to easily connect the both ends of the annular spring by brazing and soldering.
[0067]
Thus, the linear coil spring can be easily formed into an annular shape, and the inner diameter dimension of the formed annular spring 25 is equal to or slightly smaller than the outer diameter dimension of the reduced diameter portion 14 of the male joint 11. Set the spring length and screw length.
[0068]
When earthquake resistance is not required, an annular elastic member having a structure as shown in FIG. 12 can be used as another form.
[0069]
This is because the shear resistance member 26a corresponding to the core member 26 divided into several portions along the circumference in the embodiment of FIG. 9 is mounted on the outer side of the annular spring 25, in this example, on the inner diameter side, and the pulling force on the side surface of the annular spring 25 The structure is such that the deformation of the annular spring 24 against the above is suppressed. In this case, the shear resistance member 26a is directly engaged with the reduced diameter portion 14 of the male joint 11, and the annular spring 25 is attached to the outer circumference.
(5) Diameter expansion holder 27
In the female joint 21 shown in FIGS. 4 to 6, a first diameter-enlarged holding tool 27 a and a second diameter-expanded holding tool 27 b are attached to the first annular spring 25 a and the second annular spring 25 b, respectively.
[0070]
The enlarged diameter holder 27 (27a, 27b) has an outer diameter dimension slightly smaller than an inner diameter dimension of the female joint 21 and a tip portion formed in a taper shape. The annular groove 24 (24a, 27b) of the female joint 21 is formed. The annular spring 25 (25a, 25b) set to 24b) is held in an enlarged diameter.
[0071]
Further, the outer diameter dimension of the first enlarged diameter holder 27a is slightly smaller than the inner diameter dimension of the second enlarged diameter holder 27b that is formed hollow. In FIGS. 4 to 6, the first annular spring 25a and the second annular spring 25b are mounted with the respective enlarged diameter holders 27a and 27b. However, the first annular spring 25a and the second annular spring 25b are expanded. You may use the one diameter expansion holder which carries out diameter maintenance.
(6) Coupling method
As a first embodiment of the joint coupling method according to the present invention, a joint coupling process will be described with reference to FIGS.
[0072]
It is assumed that the segments are assembled so that the female joint 21 is disposed on the end face on the axial face side of the existing segment. And the segment which should be newly couple | bonded approaches from the face side of a tunnel toward a wellhead side, and aligns.
[0073]
At that time, the male joint 11 of the new segment has a protruding portion 13 protruding, and the protruding tip is tapered, so that positioning and insertion can be easily performed, and the tip of the male joint 11 is When entering the female joint 21, the alignment function works, and the perfect circle assembly performance of the segment is improved.
[0074]
Thereafter, when the segment is pushed by the jack, the protruding portion 13 of the male joint 11 is inserted into the female joint 21, and the first diameter-expanded holding tool 27 a in which the distal end portion of the male joint 11 is mounted inside the female joint 21. , The first annular spring 25a is released from the first diameter-enlarged holding tool 27a, gets over the tapered surface at the tip of the male joint 11, and condenses to the first-stage reduced diameter part (second reduced diameter part) 14b. .
[0075]
In the present embodiment, the first enlarged diameter holding tool 27a is made slightly smaller in diameter than the second enlarged diameter holding tool 27b, and as the first enlarged diameter holding tool 27a is pushed, the first enlarged diameter holding tool 27a is placed inside the second holding tool 27b. Stored (see FIG. 5).
[0076]
Further, when the segment is pushed by the jack, the distal end portion of the male joint 11 pushes in the second expanded diameter holding tool 27b in which the first expanded diameter holding tool 27a is accommodated, and the second annular spring 25b is expanded in the second diameter. It is released from the holder 27b, gets over the tapered surface at the tip of the male joint 11, and condenses to the first-stage reduced diameter portion (second reduced diameter portion) 14b, and the first annular spring 25a becomes the second reduced diameter portion 14b. Overcoming the taper surface at the rear, it is condensed into a second-stage reduced diameter portion (first reduced diameter portion) 14a (see FIG. 6).
[0077]
FIG. 15 (a) shows the first and second diameter-enlarged holders 27a and 27b, the first and second reduced diameter portions 14a and 14b of the male joint 11, and the female joint when the gap between the segments is pushed to g. FIG. 15 (b) shows the positional relationship between the first and second annular grooves 24a and 24b and the first and second annular springs 25a and 25b of FIG. As described above, the second annular spring 25a on the back side is in close contact with the outer periphery of the second reduced diameter portion 14b.
[0078]
In addition, when there is one diameter expanding holder, the empty space portion 28 on the back side of the female joint 21 is made deep enough to accommodate the diameter expanding holder, or it is difficult to secure that depth, or it is more economical as shallow depth. In order to achieve this, it is possible to manufacture the expanded diameter holder with a thin steel plate that buckles, or with a plastic or a piece of wood that breaks down.
[0079]
Further, with respect to the shearing force acting on the joint, an enlarged root portion 13 a is formed at the base of the protruding portion 13 of the male joint 11, and the enlarged root portion 13 a comes into contact with the inner surface of the opening on the joint surface side of the female joint 21. Since it can counter with the contact pressure resistance force, it can respond also to a big shear force.
[0080]
As mentioned above, although embodiment of this invention was demonstrated about the reinforced concrete segment for shield methods, as mentioned above, the precast member used as the application object of this invention is not limited to this, steel-framed reinforced concrete structure, steel concrete composite structure, concrete Of course, it can be applied to segments such as steel structures filled with steel and spheroidal graphite cast iron structures, and can also be applied to various plate-like or block-like precast members other than segments, and the joining direction is not particularly limited. It is optional depending on the use of the precast member.
[0081]
【The invention's effect】
In the case of the conventional automatic joint, a large space extending in the joint radial direction for connecting the male and female joints is required, and there is a problem of dimensional constraints, but in the present invention, the annular elastic member itself made of a spring or the like is the joint. Therefore, the structure is simple and the joint is compact and economical.
[0082]
In addition, after the male joint has entered while expanding the annular elastic member, the annular elastic member fits into the reduced diameter portion of the male joint and comes into close contact with each other. In addition, it is possible to easily deal with assembly errors and the like.
[0083]
Since the joint of the present invention is a type in which the male and female joints are embedded in the segment body, secondary lining or the like can be omitted by forming the inner surface smoothly.
[0084]
Furthermore, by providing a clearance between the annular spring and the core material built in it or omitting the core material, it is possible to easily and economically provide a structure advantageous for earthquakes by increasing the tensile deformation capacity of the joint. Can do.
[0085]
In addition, basically by simply pressing the precast members, the joints between the precast members can be completed, and there is no need for accessories such as bolts. The time can be greatly reduced and the work safety is high.
[Brief description of the drawings]
FIG. 1 is a transparent perspective view showing an embodiment in which a joint of the present invention is applied to a segment used in a shield method.
FIG. 2 is a transparent perspective view showing how segments are joined in the embodiment of FIG. 1;
3 is a transparent perspective view of a joint portion in a joined state in the embodiment of FIG.
4 is a perspective view showing the positional relationship between the male and female joints before joining in the embodiment of FIG. 1 (the female joint is a cross section).
5 is a perspective view showing the positional relationship of the male and female joints during joining in the embodiment of FIG. 1 (the female joint is a cross section).
6 is a perspective view (female joint is a cross section) showing a positional relationship between the male and female joints when the joining is completed in the embodiment of FIG.
FIG. 7 is an explanatory diagram of these positional relationships (case 1) for absorbing assembly errors when the reduced diameter portion of the male joint and the annular groove of the female joint are provided in two stages.
FIG. 8 is an explanatory diagram of these positional relationships (case 2) for absorbing assembly errors when the reduced diameter portion of the male joint and the annular groove of the female joint are provided in two stages.
FIG. 9 is a perspective view showing an embodiment of an annular elastic member mounted in an annular groove of a female joint.
FIG. 10 is a perspective view for explaining an example of a method for forming an annular elastic member to be attached to the annular groove of the female joint.
FIG. 11 is a perspective view for explaining another example of a method for forming an annular elastic member mounted in an annular groove of a female joint.
FIG. 12 is a perspective view showing another embodiment of the annular elastic member mounted in the annular groove of the female joint.
FIG. 13 is a cross-sectional view showing a modification of the cross-sectional shape of the annular elastic member.
FIG. 14 is a cross-sectional view showing another modification of the cross-sectional shape of the annular elastic member.
15 is a cross-sectional view showing the positional relationship of each member in the final fitting state of the male and female joints in the embodiment of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Segment, 1a ... Newly provided segment, 11 ... Male joint (inter-ring joint), 12 ... Anchor part, 13 ... Projection part, 13a ... Expansion root part, 14 ... Reduced diameter part, 14a ... 1st reduced diameter part, 14b ... 2nd reduced diameter part, 21 ... Female joint (inter-ring joint), 22 ... Anchor part, 23 ... Head, 24 ... Annular groove, 24a ... 1st annular groove, 24b ... 2nd annular groove, 25 ... Annular spring, 25a ... 1st annular spring, 25b ... 2nd annular spring, 26 ... Core material, 26a ... Shear resistance member, 27 ... Expanding holder, 27a ... 1st expanding holder, 27b ... 2nd expanding holder, 28 ... Empty room part, 29 ... Screw fastening member, 31 ... Male joint (inter-segment joint), 41 ... Female joint (inter-segment joint)

Claims (7)

In a joint of a precast member that joins a male joint provided at a joint position of one precast member to be joined to a female joint provided at a joint position of the other precast member, the male joint is the one of the one It has a rod-like protrusion that protrudes from the joint surface of the precast member, a reduced diameter portion is formed on the outer peripheral surface of the protrusion, and the female joint opens to the joint surface of the other precast member, The protruding portion of the male joint has a cylindrical head portion that is fitted into an inner hollow portion, and the reduced diameter portion in a state where the protruding portion of the male joint is fitted to the inner surface of the head portion; An annular groove is formed at a corresponding position, and an annular elastic member that has an inner diameter in a contracted state is smaller than an outer diameter of the protruding portion of the male joint and can be elastically expanded and contracted in the radial direction is attached to the annular groove. and, said annular elastic member, carp Joint precast member, characterized in that the ends of the spring is an annular spring which is connected to the annular.   The joint of the precast member according to claim 1, wherein the reduced diameter portion of the male joint and the annular groove of the female joint are provided in two or more stages.   The joint of the precast member according to claim 2, wherein a predetermined gap amount is provided between the interval between the reduced diameter portions and the interval between the annular grooves. The joint of the precast member according to claim 1, 2, or 3, wherein a core material obtained by dividing the ring into a plurality of rings is inserted into the coil of the annular spring. A plurality of shearing resistance members for intermittently attaching a shearing force acting on the annular elastic member in a joint fitting direction to the annular elastic member in a joint fitting direction are intermittently attached along the circumferential direction. The joint of the precast member as described in 1, 2 or 3 . On the inner diameter side of the annular elastic member, the annular elastic member is held in a state in which the diameter has been expanded by a predetermined amount in advance, and the annular joint that is pushed forward in the joint fitting direction by inserting the protruding portion of the male joint is inserted. The joint of the precast member according to any one of claims 1 to 5, wherein an expanded diameter holding tool is mounted. A precast member in which a plurality of male joints or female joints of the joint of the precast member according to any one of claims 1 to 6 are installed on a joint surface.

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