JP3707981B2 - Sliding wedge joint and segment piece - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure used for a segment used as a shield tunnel for water and sewerage, for example , and a segment piece having the joint .
[0002]
[Prior art]
For example, for a segment used as a shield tunnel, construction work is carried out while fastening segment pieces divided not only in the axial direction of the tunnel but also in the circumferential direction of the tunnel into the circumferential direction as well as the axial direction. I do. The applicant has already filed a patent application for the joint used for fastening in the circumferential direction (Japanese Patent Application No. 7-187351). In the joint according to this application, the male joint provided on the joint surface of one segment piece is fitted into the female joint provided on the joint surface of the other segment piece, and fastening is performed.
[0003]
An enlarged view of this joint is shown in FIG. That is, the male joint 101 has a substantially T-shaped cross section, and the female joint 103 has a groove 105 having a substantially T-shaped cross section so as to allow the male joint 101 to be inserted. The web portion 109 that supports the T-shaped flange portion 107 of the male joint 101 is shortened according to the direction in which the fitting proceeds (downward in the figure), and conversely, the T-shaped flange portion of the groove 105 of the female joint 103. Is thickened according to the direction of insertion.
[0004]
Due to the wedge effect of the two tapered shapes, the jaw portion 111 receives a compressive force when contact occurs due to insertion, and tension is generated in the web portion 109 as a reaction. Due to this tension, the joint surfaces of the two segment pieces are attracted with a sufficiently large force to be fastened.
Such a joint has advantages such that a large fastening force can be obtained, a bolt and a nut are not required, and a segment assembling operation is simplified.
[0005]
[Problems to be solved by the invention]
In order for the force necessary for fastening the above-mentioned joint to be firmly fastened, that is, the tension generated in the web portion 109, to obtain a value in the range necessary for the design, high dimensional accuracy is required for the joint. However, a design error and a mounting error occur in the male joint 11 and the female joint 13, and a slight error appears as a large tension error due to the wedge effect. For this reason, it was difficult to obtain a tension within the range necessary for the design. If the tension is too large compared with the tension required in the design, there is a possibility that the force required for insertion becomes too large and the fastening is not completed. Moreover, there is a possibility that the degree of stress introduced into the web portion exceeds the yield point or, in extreme cases, breaks.
The present invention has been made to solve the above problems, and an object of the present invention is to provide a sliding wedge joint capable of absorbing joint errors and a segment piece having the sliding wedge joint .
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, a first invention provides a male joint having a flange portion and a web portion having a substantially T-shaped cross section provided on one side of a joint, and the male joint provided on the other side of the joint. The contact force between the female joint having a groove that fits while moving the flange part and the web part, and the flange part of the male joint increases as the fitting of the flange part of the male joint proceeds in the groove. A contact portion having a tapered surface and disposed in a part of the groove; a sliding surface provided in the female joint and in contact with the contact portion; and holding the contact portion on the sliding surface , characterized in that the contact force in the direction of movement of the male joint and a holding section provided to cause the sliding of the contact portion on the sliding surface occurs and destruction increases beyond a predetermined value This is a sliding wedge joint.
[0007]
According to a second aspect of the present invention, the holding portion is configured by a shear key provided at the contact portion and causing the breakage, and a key groove provided on the sliding surface and fitted with the shear key. This is a sliding wedge-type joint.
[0008]
According to a third aspect of the present invention, the holding portion further comprises a hole provided in the contact portion and a shear pin inserted into the hole from the female joint and causing the breakage. It is a wedge-shaped joint.
[0009]
According to a fourth aspect of the present invention, the holding portion is screwed into the screw hole from the end portion of the female joint and a screw hole provided at a rear end portion of the contact portion with respect to the fitting direction of the male joint. The sliding wedge type joint is characterized by comprising a pulling pin that causes the fracture .
[0010]
According to a fifth aspect of the present invention, the segment piece further includes a concrete casing in which at least one of the female joint and the female joint of any one of the sliding wedge joints is attached to an end. is there.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
First, FIG. 2 is an overall perspective view of the shield segment 1 in which the joint according to this embodiment is used. Five segment pieces A1, A2, B1, B2, and K divided in the circumferential direction are fastened by the joint according to this embodiment, and the ring body 3 is formed. The ring body 3 is further fastened in the axial direction. The fastening between the ring bodies 3 is performed by another joint.
[0012]
FIG. 3 shows the structure of a joint for fastening the segment pieces B1, K, B2 constituting the shield segment 1 of FIG. 2 in the circumferential direction. These segment pieces B1, K, B2 are synthetic segments made of steel and concrete. Inside the concrete housing 5, a steel plate 9 provided with projections 7 for improving the biting with the concrete is arranged in the circumferential direction, and joints 11 and 13 are welded to both ends of the steel plate 9, and the concrete surface Exposed from.
[0013]
As shown in FIGS. 3, 1, and 5, the joint includes a male joint 11 and a female joint 13, both of which have a substantially T-shaped cross section and are designed to be fitted. The web portion 15 constituting the T-shape of the male joint 11 is shortened in the direction in which the insertion proceeds, that is, the substantially left direction in FIG. 3, and conversely, the T-shaped flange of the groove 17 of the female joint 13. The jaw part 19 which comprises a part becomes thick according to the direction in which insertion progresses. Since the male joint 11 and the female joint 13 each have a tapered shape as described above, when the insertion proceeds, the lower surface 21A of the flange portion 21 constituting the T-shape of the male joint 11 and the jaw of the female joint 13 The upper surfaces 19A of the portions 19 approach and come into contact with each other. In this way, the tapered shape (15) (19) provides a wedge effect during insertion, and secure fastening.
[0014]
One of these two contact portions, that is, in this embodiment, the contact portion 23 including the upper surface 19A of the jaw portion 19 of the female joint 13 is separated from the other portions and is slidable in the insertion direction. It has a simple structure. On the sliding surface 25 where the sliding separation is performed, a shear key 27 is formed on the contact portion 23 side, and a key groove 29 is formed on the other portion side of the jaw portion 19. The cross-sectional area of the shear key 27 is designed to withstand until the contact force accompanying the insertion exceeds a predetermined value, and to cause a breakage when exceeding the predetermined value.
[0015]
The contact portion 23 is temporarily bonded to the key groove 29 or the sliding surface 25 with an adhesive or the like to prevent the contact portion 23 from falling off during handling of the fastening operation. The same applies to other embodiments described later.
[0016]
FIG. 4 is a development view of the shield segment 1 in which the arrangement of the segment pieces A1, A2, B1, B2, and K is fastened. For each ring body 3, five types of segment pieces A1, A2, B1, B2, and K are provided. In the figure, M represents a male joint, and F represents a female joint.
[0017]
Among these segment pieces, the A1 type and the A2 type are both rectangular development views, and only the arrangement of the male joint M and the female joint F is different. Both the B1 type and the B2 type are trapezoids, and two corners of the trapezoid are right angles, and a straight side sandwiched between the right angles is a joint surface that contacts the A1 type or A2 type segment piece. The hypotenuses of the trapezoids of the B1 type and B2 type are joint surfaces that are in contact with the hypotenuse of the K type segment piece. This KA type is a trapezoid having two hypotenuses, and a pressure input is applied to the last of the five segment pieces to be pushed in and the ring body 3 is completed.
[0018]
Each ring body 3 is shifted by a predetermined amount in the circumferential direction, and this shifting is performed in a staggered manner. This staggered shift prevents the joint surfaces from aligning in a row and increasing the overall strength.
[0019]
(Effect of embodiment)
In FIG. 6, the operational effects of this embodiment will be described.
When the male joint 11 is fitted into the female joint 13 (FIG. 1A), the contact portion of the male joint 11 (the lower surface 21A of the flange portion 21) and the contact portion 23 of the female joint 13 (the upper surface 19A of the jaw portion 19). Approach each other and eventually come into contact with each other ((B) in the figure). As the insertion proceeds (FIG. 3C), the contact force increases, the web portion 15 of the male joint 11 slightly expands, and the jaw portion 19 of the female joint 13 slightly contracts. When the insertion further proceeds and the contact force increases beyond a predetermined value, the shearing force applied to the shearing key 27 exceeds the limit and breaks. Due to this breakage, the contact portion 23 of the female joint 13 starts sliding separation on the sliding surface 25, and the fitting continues while maintaining the above-described predetermined contact force, and the insertion to the predetermined position is completed in due course (the same figure). (D)).
[0020]
(Other embodiments)
It is desirable that the sliding surface 25 coincides with the insertion direction so that the sliding can be performed smoothly. In the above embodiment, the insertion direction and the joint surface 31 faced the same direction. If it demonstrates in FIG. 4, it was a coupling | joint provided in the joint surface between A1 type | mold and A2 type | mold of segment piece, between A1 type | mold and B1 type | mold, and between B2 type | mold and A2 type | mold.
[0021]
However, in other embodiments, for example, a joint provided on the joint surface between the K type and the B1 type in FIG. 4 or between the K type and the B2 type, the joint surface with respect to the insertion direction 33 as shown in FIG. Since 31 is inclined by an angle θ, in order to make the sliding surface 25 coincide with the insertion direction 33, the shape of the other portion 19 B excluding the contact portion 23 of the jaw portion 19 of the female joint 13 is an angle θ. It becomes a taper shape by the amount.
[0022]
In the above embodiment, the holding portion for holding the contact portion 23 on the female joint 13 is the shear key 27. However, in other embodiments, various holding members can be employed. It is.
[0023]
For example, as shown in FIG. 8, the shear pin 35 can be used. The shear pin 35 communicates with a through hole 37 that penetrates the side surface of the female joint 13 and a screw hole 39 that is opened on the side surface of the contact portion 23. The formed male screw 41 can be screwed. In this case, the cross-sectional area of the shear pin 35 is designed so that when the contact force increases beyond a predetermined level, the shear pin causes 35 shear failure.
[0024]
(Example)
An embodiment in which the embodiment using the shear pin 35 is implemented for fastening an actual segment will be described.
That is, the joint of this embodiment was applied to a segment for a sewer tunnel having a diameter of 3800 mm, a width of 1000 mm, and a thickness of 150 mm. The segment shape was a quadrilateral isosceles trapezoid, and the inclination θ of the joint surface with respect to the tunnel axis (insertion direction 33) was 1/50. Moreover, the joint between the rings which is not shown in figure was made into the insertion type pin joint.
[0025]
The tension to be introduced into the joint portion is about 25 tf when it is considered equivalent to the case of the conventional bolt type joint (M24 × 2 pieces, strength classification 8.8).
On the other hand, when the inclination of the joint surface is 1/50 in the laboratory experiment, between the fitting input F and the tension T of the web portion,
T = 3 · F
It has been confirmed that this relationship holds. Therefore, it is only necessary to break at 25/3 = 8.3 tf. If the shear pin method is used and two shear pins 35 are used per contact portion 23, the shear strength per shear pin is
8300kgf / (2x2) = 2080kgf
If a pin of strength category 8.8 is used as the shear pin, the required diameter d is d = 0.757 cm.
It becomes. In addition, a shear test of the material of the shear pin 35 was performed, and it was confirmed that when the diameter was 75 mm, shear fracture occurred at approximately 2080 kgf.
[0026]
The assembly order of the segments in which the joints of this embodiment are attached between the pieces is the same shape of the segment pieces with the same shape of an isosceles trapezoid, and after the two pieces are assembled every other piece, the remaining two pieces are installed. It was fastened by pushing between the pieces. It was confirmed that at about 8.3 tf per joint, the four shear pins 35 were simultaneously sheared and broken, and a predetermined tension was introduced into the joint. It was also confirmed that the strength was equivalent to that of the bolt type joint.
[0027]
In another embodiment, as shown in FIG. 9, the holding portion can be a pulling pin 43 that is broken by a pulling force. That is, an upright anchor portion 45 is provided at the end of the jaw portion 19 of the female joint 13 where the insertion is performed (inlet side), a through hole 47 in the insertion direction is formed in the anchor portion 45, and the contact portion A screw hole 49 in the fitting direction is formed at the rear end of 23, the pulling pin 43 is inserted in a state in which both are connected, and the male screw 51 formed at the tip of the pulling pin 43 is screwed. A flange 53 is formed at the rear end of the pull pin 43 and is locked to the anchor portion 45. In this case as well, when the contact force increases beyond a predetermined value, the pull pin 43 is broken by the pull force, and the contact portion 23 causes sliding separation along the sliding surface 25.
[0028]
Instead of the pulling pin 43, it is possible to employ another pulling member that causes breakage by a pulling force. That is, any member may be used as long as the material or shape is such that when the pulling force reaches a certain value, the material breaks with almost no deformation.
[0029]
As a reference example, the retaining portion as shown in FIG. 10, there is a structure in which a seat屈材55 resulting buckling broken by compressive forces. That is, a standing portion 57 is provided at the far end in the fitting direction in the jaw portion 19 of the female joint 13, and the buckling material 55 is disposed between the standing portion 57 and the tip of the contact portion 23. This buckling material has a cylindrical shape (FIG. 3C).
[0030]
However, the buckling material 55 may have any shape as long as it can cause buckling. For example, a plate material causing surface buckling may be used (FIG. (D)), or a rod material (FIG. (E)) causing column buckling may be used.
The buckling load that causes buckling failure is constant and can be easily obtained.
[0031]
In another embodiment, as shown in FIG. 11, it is also possible to provide fine wavy irregularities 59 on the sliding surface 25 and to fit each other. When the contact force exceeds a predetermined value, the fine unevenness 59 is broken and sliding separation occurs at the contact portion 23.
[0032]
In the above embodiment, the contact portion 23 where the sliding separation occurs on the sliding surface 25 is provided on the female joint 13 side. However, in other embodiments, on the male joint 11 side. It is also possible to provide it. That is, for example, the flange portion 21 of the male joint 11 is made thick so that sliding separation can occur due to the sliding surface formed in the fitting direction, and any one of the above-described various holding portions is attached to the sliding surface. It is possible to provide.
[0033]
Further, in the above first embodiment and the like (FIGS. 1, 6, 7, and 8), the joint is provided at substantially the entire length of the joint surface 31 (almost the entire length in the axial direction (insertion direction) of the tunnel). However, in other embodiments, it may be provided on a part of the joint surface 31 (FIGS. 9 and 11).
[0034]
【The invention's effect】
As described above, according to the first, second, third, fourth, or fifth invention, the fitting into the female joint proceeds, and the contact force accompanying the fitting exceeds a predetermined value due to the error of the joint. When it becomes larger, the holding portion breaks, and the contact portion slides on the sliding surface, thereby causing separation. By this sliding separation, the insertion can be completed while maintaining a predetermined contact force. Since the predetermined contact force can be maintained, an error in tension generated by the wedge effect is reduced, and a tension within a range necessary for design can be obtained. Thus, the joint error can be absorbed by the sliding separation on the sliding surface.
[Brief description of the drawings]
1A and 1B show a sliding wedge joint according to a first embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. 1B is an end view of the front side in the insertion direction of FIG. (D) is a perspective view showing the main part of (A).
2 is a perspective view of the entire shield segment fastened using the joint of FIG. 1. FIG.
3 is a perspective view showing a segment piece constituting the shield segment of FIG. 2. FIG.
FIG. 4 is a development view of FIG. 2;
5 is an overall schematic perspective view showing a state before the joint of FIG. 1 is inserted. FIG.
6A to 6D are diagrams showing the operation of FIG. 1A together with the insertion process.
7A and 7B show a second embodiment of the present invention, wherein FIG. 7A is a longitudinal sectional view, FIG. 7B is an end view on the front side in the insertion direction of FIG. It is an end view.
8A and 8B show a third embodiment of the present invention, in which FIG. 8A is a longitudinal sectional view, FIG. 8B is an end view on the front side in the insertion direction of FIG. The end view (D) is a perspective view showing the shear pin of (B).
9A and 9B show a fourth embodiment of the present invention, in which FIG. 9A is a longitudinal sectional view, FIG. 9B is an enlarged view of a main part of FIG. 9A, and FIG. .
FIG. 10 shows a reference example , (A) is a longitudinal sectional view (B) is an enlarged view of a main part of (A), (C) is a perspective view (B) showing a buckling material of (B), and FIG. The perspective view (E) which shows a buckling material is a perspective view which shows another buckling material.
11A and 11B show a fifth embodiment of the present invention, in which FIG. 11A is a longitudinal sectional view and FIG. 11B is an enlarged view of a main part of FIG.
FIG. 12 is an overall schematic perspective view showing a state before fitting of a joint showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield segment A1, A2, B1, B2, K Segment piece 3 Ring body 5 Concrete housing 7 Protrusion 9 Steel plate 11 Male joint 13 Female joint 15 Web part 17 Groove 19 Jaw part 21 Flange part 23 Contact part 25 Sliding surface 27 Shear Key 29 Key groove 31 Joint surface 33 Insertion direction 35 Shear pin 37 Through hole 39 Screw hole 41 Male screw 43 Pulling pin 45 Anchor part 47 Through hole 49 Screw hole 51 Male screw 53 Flange 55 Buckling material 57 Standing part 59 Fine irregularities

Claims (5)

A male joint having a flange portion and a web portion provided on one side of the joint and having a substantially T-shaped cross section;
A female joint having a groove which is provided on the other side of the joint and fits while moving the flange part and the web part of the male joint;
A contact portion disposed in a part of the groove having a tapered surface that increases a contact force with the flange portion of the male joint as insertion of the flange portion of the male joint proceeds in the groove;
A sliding surface provided on the female joint and in contact with the contact portion;
Holding the contacts on the sliding surface, resulting sliding of the contact portion and the contact force in the direction of movement of the male joint is caused and destruction increases beyond a predetermined value on said sliding surface A sliding wedge-type joint comprising: a holding portion provided to cause The said holding | maintenance part is comprised from the shear key which the said contact part and the said destruction generate | occur | produce, and the key groove which is provided in the said sliding surface and the said shear key is engage | inserted. 2. A sliding wedge-shaped joint according to 1. 2. The sliding wedge joint according to claim 1, wherein the holding portion includes a hole provided in the contact portion, and a shear pin inserted into the hole from the female joint and causing the fracture. . The holding portion includes a screw hole provided at a rear end portion of the contact portion with respect to a fitting direction of the male joint, and a tension pin screwed into the screw hole from the end portion of the female joint and causing the breakage. The sliding wedge type joint according to claim 1, wherein The segment piece, wherein at least one of the female coupling and the female joint has a concrete skeleton that is attached to an end portion of one of the sliding wedge-type joint according to claim 1 to claim 4.

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