JP2009114694A - Segment connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment connection structure which connects between mutually opposed segments via connection fittings, wherein the segment connection structure brings about cost reduction of component parts. <P>SOLUTION: According to the segment connection structure, the male connection fitting 13 arranged on a connection end face 12 of one of the segments 11 consists of a long nut 17, and a hole-in anchor 18 screwed into the long nut 17, which hole-in anchor 18 is formed of a male screw portion 19 screwed and coupled to the long nut 17, a reaming portion 21 protruded from the contact end face 12, and a reaming wedge 22 inserted into a front end of the reaming portion 21. Then the female connection fitting 16 is formed of an engaging fitting 20 arranged in a contact end face 15 of the other segment 14. When the reaming wedge 22 is butted against a bottom portion 24 of the engaging fitting 20, a peripheral portion of the reaming portion 21 is engaged with an internal peripheral protrusion 23 of the engaging fitting 20, and exerts drawout strength. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical concrete segment used for constructing a cylindrical structure such as an underground tunnel or a shaft, or a divided concrete segment obtained by dividing the cylindrical concrete segment into a plurality of circumferential directions (hereinafter referred to as these segments). Concrete segments are simply referred to as “segments”).

  In the conventionally known segment connection structure, the structure of the connection fitting is simple and low-cost, while there is one disclosed in the following patent document as one that can exert a strong coupling force.

  The connection structure in this case is such that the tip of the steel rod inserted into one segment protrudes from the connection end surface, and a wedge receiving hole is provided at the tip of the protruding portion, and a plurality of cuts are made in the peripheral wall of the wedge receiving hole. Are provided in the axial direction. The male side connection portion is configured by inserting the tip end portion of the wedge member into the wedge receiving hole. Further, a joint receiving hole for receiving the tip of the steel rod is provided on the connection end surface of the other segment, thereby forming a female side connection.

In order to connect adjacent segments using the connection structure described above, the wedge member is joined by inserting the male side connection part of one segment into the female side connection part of the other segment and applying an impact in the insertion direction. At the same time as colliding with the bottom of the receiving hole, the peripheral wall of the wedge receiving hole is expanded at the notch portion and locked to the inner peripheral wall of the joint receiving hole. This connects both segments.
JP-A-8-210095

  The conventional segment connection structure is advantageous in that the number of parts is small, the cost is low, and the workability is good.

  However, the connection structure described above needs to be manufactured with high accuracy so that the distance between the connection end faces becomes constant when the wedge member contacts the bottom surface of the joint receiving hole. If the accuracy is low, a large gap may remain between both connection end faces when the wedge member is pushed in and the wedge receiving hole is expanded. Conversely, the connection end face may come into contact before the wedge receiving hole is completely expanded, resulting in incomplete connection.

  In addition, the connection structure has a connection end surface in which the outer peripheral surface of the wedge receiving hole in an expanded state destroys the concrete on the inner surface of the joint receiving hole when a large external force acts in the direction of separating the segments due to an earthquake or the like. There may be gaps between them, and there is a disadvantage that water leaks from the gaps.

  Accordingly, an object of the present invention is to provide a segment connection structure that eliminates the inconveniences described above while being low in cost.

  In order to solve the above-described problems, the present invention is configured so that, as shown in FIGS. 1A and 1B, a male-side connection fitting 13 provided on the connection end surface 12 of one segment 11 and the other segment 14. The segment connection structure in which the segments 11 and 14 are connected to each other by the female-side connection fitting 16 provided on the connection end surface 15 is a premise of the invention.

  The male connection fitting 13 is composed of a long nut 17 inserted into one segment 11 and opened to the connection end face 12, and a hole-in anchor 18 screwed to the open end of the long nut 17. The hole-in anchor 18 includes a male screw portion 19 screwed to the long nut 17, a widening portion 21 provided at an end opposite to the male screw portion 19 and protruding from the connection end surface 12, and its widening portion. It is comprised from the expansion wedge 22 inserted in the front-end | tip part of 21. As shown in FIG. The widening wedge 22 is partially inserted with its narrow end on the inside facing the widening portion 21.

  The female connection fitting 16 includes a locking fitting 20 inserted into the other segment 14 and opened to the connection end face 15. An inner peripheral ridge 23 that engages with the outer peripheral portion of the expanding portion 21 is provided on the inner peripheral surface of the locking fitting 20, and a bottom portion 24 on which the expanded wedge 22 abuts is provided on the inner bottom surface. In the state where the expanded wedge 22 is pushed in by collision with the bottom portion 24 and the expanded portion 21 is expanded to be locked to the inner peripheral ridge 23, the two connection end faces 12, 15 are mutually connected. It is the structure which contacts.

  The bottom portion 24 of the locking fitting 20 can be constituted by a hollow set screw 33 screwed into the bottom side screw hole 38 of the locking fitting 20. Further, it is desirable that an elastic sealing material 36 is interposed between the connection end faces 12 and 15.

The invention according to the segment connection structure having the above configuration has the following effects.
(1) Since a general-purpose type hole-in anchor 18 constituting the expanded portion 21 of the male connection fitting 13 can be used, the cost of the constituent members can be reduced.
(2) If the hole-in anchor 18 is removed at the time of transporting the segment 11 and attached at the construction site, there is no projecting object at the time of transport, which is convenient in handling the segment 11.
(3) By adjusting the screwing amount of the hole-in anchor 18 with respect to the long nut 17, the protruding length of the expanded portion 21 can be set accurately, and a highly accurate connection structure can be provided.
(4) After the connection, even if an external force acting in the direction of separating the two acts between the segments 11 and 14, the seal is held by the expansion and contraction of the elastic sealing material 36 interposed between the connection end surfaces 12 and 15, and water leakage is prevented. Can be prevented.
(5) By forming the bottom portion 24 by screwing the hollow set screw 33 into the bottom-side screw hole 38 of the locking fitting 20, it is possible to reduce the cost of the constituent members as compared with the case where the bottom portion is formed by welding.
(6) By adjusting the screwing amount of the hollow set screw 33 before placing the concrete, the length from the connection end surface 15 to the bottom 24 (hollow set screw 33) of the locking metal fitting 20 can be set accurately. it can.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The segments to be connected in the case of the first embodiment are the cylindrical segments 11 and 14 as shown in FIG. 2A and the cylindrical concrete segment as shown in FIG. 2B. May be divided into a plurality of segments 11 ′ and 14 ′ in the circumferential direction. In the following description, the connection structure of the cylindrical concrete segments 11 and 14 will be described, but the same applies to the case of the split concrete segments 11 'and 14'.

  As shown in FIG. 1A, the connection ends 12 and 15 of the segments 11 and 14 and the inner peripheral surfaces of the segments 11 and 14 are covered with reinforcing steel plates 25 and 26, respectively.

  Openings 27 are provided in the reinforcing steel plate 25 constituting the connection end surface 12 of one segment 11 at a predetermined interval in the circumferential direction. One end surface of the long nut 17 is welded to the inner surface of the opening 27, and the long nut 17 is opened to the connection end surface 12. A closing bolt 28 is screwed into the inner end of the long nut 17 to prevent the concrete from entering the long nut 17.

  The male screw portion 19 of the hole-in anchor 18 is inserted from the opening 27 and is screwed into the screw hole 17 a of the long nut 17. An expanded portion 21 provided at the other end of the hole-in anchor 18 protrudes from the connection end surface 12 to the outside. The long-side nut 17, the bolt 28, and the hole-in anchor 18 constitute the male connection fitting 13.

  At the time of forming the segment 11, the long nut 17 is welded to a predetermined position on the inner surface of the connection end surface 12 of the reinforcing steel plate 25, and a bolt 28 is screwed into the distal end portion of the long nut 17 to close it. A closing plug (not shown) is screwed into the end of the long nut 17 from the opening 27, and then concrete is placed using the reinforcing steel plate 25 as a mold. Thereby, the long nut 17 and the bolt 28 are insert-molded into the segment 11.

  A single-side groove 30 a for sealing is provided on the outer peripheral portion of the connection end surface 12 of the segment 11.

  The hole-in anchor 18 has a male screw portion 19 at one end of a steel rod and an expanded portion 21 at the other end. As shown in FIG. 1 (b), the expanding portion 21 has a plurality of slits 31 that reach the bottom surface of the wedge hole 29 from the tip of the wedge hole 29 opened at the tip of the other end of the steel rod. It is provided at a place. In addition, a plurality of circumferential grooves are provided on the outer peripheral surface at a required interval, whereby the uneven surface 32 is formed.

  A tapered expanded wedge 22 is partially inserted into the open end portion of the wedge hole 29 with the narrow side end thereof facing inward. The expanded wedge 22 is inserted and held with a force that does not exert an expanding force and does not fall off. The protruding length from the expanding portion 21 in the state of being held in this way is indicated by a (see FIG. 1A), and the length from the connection end surface 12 to the tip of the expanding wedge 22 is indicated by A. The protrusion length A can be accurately obtained by adjusting the screwing amount of the male screw portion 19 into the long nut 17.

  As shown by the alternate long and short dash line in FIG. 1B, the expanded portion 21 is expanded when the expanded wedge 22 is pushed into the wedge hole 29 so that the slit 31 is expanded and the expanded portion 21 expands in a tapered shape. Opened.

  A female connection fitting 16 corresponding to the male connection fitting 13 is provided on the connection end face 15 of the other segment 14. The female connection fitting 16 includes a locking fitting 20 welded to the inner surface of an opening 39 provided in the reinforcing steel plate 26 of the connection end face 15 and a hollow set screw 33 constituting the bottom 24 of the locking fitting 20. As with the segment 11, it is inserted into the segment 14.

  An opening-side screw hole 34 that communicates with the opening 39 is formed inside the locking fitting 20, and a bottom-side screw hole 38 that communicates with the opening-side screw hole 34 is provided at the opposite end. It is done. The hollow set screw 33 is screwed into the bottom side screw hole 38.

  An inner peripheral ridge 23 is provided in contact with the open-side screw hole 34 on the inner peripheral surface of the engagement fitting 20 between the open-side screw hole 34 and the bottom-side screw hole 38, and the inner peripheral ridge 23 and the bottom portion are further provided. An expansion recess 35 is provided between the side screw holes 38.

  By adjusting the screwing amount of the hollow set screw 33, the distance B from the connection end face 15 to the bottom 24 (hollow set screw 33) can be set accurately.

  The inner diameter of the open side screw hole 34 is formed larger than the outer diameter of the hole-in anchor 18. The inner diameter of the inner circumferential ridge 23 is formed to have a size substantially equal to the outer diameter of the hole-in anchor 18 within a range in which the expanded portion 21 can pass. Further, the expanding recess 35 is formed to have an inner diameter comparable to the diameter of the open-side screw hole 34. The length of the expanding recess 35 in the axial direction is the same as the protruding length a of the expanding wedge 22.

  In addition, the one side groove | channel 30b facing the said one side groove | channel 30a for a seal | sticker is provided also in the outer peripheral part of the connection end surface 15 of this segment 14. FIG. As in the case of the segment 11, the closing plug is screwed into the open-side screw hole 34 when the concrete is placed during the production of the segment 14.

  The segment 11 provided with the male connection fitting 13 and the segment 14 provided with the female connection fitting 16 are configured as described above. Next, the operation will be described.

  The segment 11 can be transported to the construction site with the hole-in anchor 18 attached in advance. If it is attached at the construction site, the expanded portion 21 does not protrude from the end face of the segment 11 during transportation, which is convenient for handling.

  When connecting both the segments 11 and 14, the protruding length A of the expanded portion 21 is the length B to the bottom 24 (hollow set screw 33) of the locking bracket 20 and the extended length of the expanded wedge 22. The length (A = B + a + c) is set by adding a and the thickness c of the elastic sealing material 36 when compressed (see FIG. 3B).

  When performing the connection work, the elastic sealing material 36 is attached in a range surrounding the outer periphery of all the openings 27 or 39 belonging to the connection end surface 12 or 15 in advance in any one of the connection end surfaces 12 and 15.

  Thereafter, the expanding portion 21 of the male connection fitting 13 is expanded from the opening 39 of the female connection fitting 16 through the screw hole 34 of the locking fitting 20 while bringing both the connection end faces 12 and 15 closer to each other. Insert until the side end surface contacts the hollow set screw 33 (see arrow in FIG. 1A, see FIG. 3A). In the state where the tip of the expanded wedge 22 is in contact with the hollow set screw 33, there is a gap a + c between the connection end faces 12 and 15, and the relationship of A = B + a + c is satisfied.

  Further, in the state of FIG. 3A, the exposed portion of the expanded wedge 22 enters the range of the expanded recess 35. At this time, a radial gap b exists between the outer diameter surface of the expanded wedge 22 and the inner diameter surface of the expanded recess 35.

  Further, when an external force is applied to both the segments 11 and 14 so as to advance the connection, the expanded wedge 22 is pushed by the hollow set screw 33. As a result, the expanded portion 21 is expanded radially outwardly within the range of the radial gap b at the slit 31, and the irregular surface 32 of the outer diameter surface is engaged with the inner peripheral ridge 23. (See FIG. 3B). The pulling force of both segments 11 and 14 is generated and connected by the engaging force.

  At the same time, the connection end faces 12 and 15 are closest to each other, and the elastic sealing material 36 is compressed flat (the thickness at the time of compression is indicated by c, see FIG. 3B). In the “claims”, the mutual relationship between the connection end faces 12 and 15 in a state where the elastic sealing material 36 is compressed to the thickness c is referred to as “the connection end faces 12 and 15 abut against each other”.

  In the above state, the connection end faces 12 and 15 are sealed by the elastic sealing material 36 to prevent water leakage from the inside to the outside. Moreover, the one side groove | channels 30a and 30b approach both, and the one sealing groove | channel 30 is formed. A packing 37 is attached to the seal groove 30 (see FIG. 4A) to prevent intrusion of earth and sand from the outside.

  A strong external force acting in the direction of separating both the segments 11 and 14 due to an earthquake or the like acts on the segments 11 and 14 and shifts to the locking position of the expanded portion 21 with respect to the inner peripheral ridge 23 as shown in FIG. When the gap between the connection end faces 12 and 15 spreads, the elastic seal member 36 expands to maintain the sealing action between the connection end faces 12 and 15. Further, when an external force in the approaching direction is applied from the state in which the connection end faces 12 and 15 are expanded as described above, the elastic seal member 36 is compressed following this to maintain the sealing action.

  In this way, the connection portion flexibly responds to the action of the external force on the segments 11 and 14 and maintains the sealing action.

  When the elastic sealing material 36 is not used (c = 0), “the connection end faces 12 and 15 abut against each other” in the claims means literally abut or substantially abut. .

(A) Partially exploded sectional view of Example 1, (b) Partially enlarged sectional view of the same as above (A) Exploded perspective view of cylindrical segment same as above, (b) Disassembled perspective view of divided segment same as above (A) Partial sectional view in the middle of connection, (b) Partial sectional view after connection, same as above (A) Partially enlarged cross-sectional view after connection as in the above, (b) Partially enlarged cross-sectional view of the deformed state of the connecting portion as in the above

Explanation of symbols

11, 11 'Segment 12 Connection end face 13 Male connection fitting 14, 14' Segment 15 Connection end face 16 Female connection fitting 17 Long nut 17a Screw hole 18 Hole-in anchor 19 Male thread portion 20 Locking bracket 21 Expanding portion 22 Expanding Wedge 23 Inner peripheral ridge 24 Bottom 25 Reinforced steel plate 26 Reinforced steel plate 27 Opening 28 Bolt 29 Wedge 29 Seal groove 30a, 30b One-side groove 31 Slit 32 Uneven surface 33 Hollow set screw 34 Open-side screw hole 35 Expanded recess 36 Elastic seal Material 37 Packing 38 Bottom side screw hole 39 Opening

Claims (4)

A segment is formed by a male connection fitting (13) provided on the connection end face (12) of one segment (11) and a female connection fitting (16) provided on the connection end face (15) of the other segment (14). (11, 14) In the segment connection structure for connecting each other,
The male connection fitting (13) is screwed to a long nut (17) inserted into one segment (11) and opened to the connection end face (12), and an open end of the long nut (17). The hole-in anchor (18) comprises a male screw part (19) screwed to the long nut (17) and an end opposite to the male screw part (19). And an expanded portion (21) protruding from the connection end face (12) and an expanded wedge (22) inserted at the tip of the expanded portion (21). The expanded wedge (22) The narrow side tip is partially inserted toward the inside of the widened portion (21), and the female side connection fitting (16) is inserted into the other segment (14) and opened to the connection end surface (15). The locking bracket (20) has an outer peripheral portion of the expanded portion (21) on the inner peripheral surface thereof. An inner peripheral ridge (23) is provided, and a bottom (24) against which the expanded wedge (22) abuts is provided on the inner bottom surface. The expanded wedge (22) is caused by a collision with the bottom (24). When both the connecting end faces (12, 15) are brought into contact with each other in a state of being engaged with the inner peripheral protrusion (23) by being pushed in and the expanding portion (21) is expanded. Segment connection structure.   The expanded portion (21) of the hole-in anchor (18) is provided with a wedge hole (29) having a required length in the axial direction from the front end surface thereof, and a plurality of slits (31) are formed on the peripheral wall of the wedge hole (29). 2. The segment connection according to claim 1, wherein an uneven surface is formed by a plurality of circumferential grooves formed on an outer peripheral surface of the expanded portion. Construction.   The bottom portion (24) of the locking metal fitting (20) is constituted by a hollow set screw (33) screwed into a bottom screw hole (38) of the locking metal fitting (20). 3. The segment connection structure according to 1 or 2.   The segment connection structure according to any one of claims 1 to 3, wherein an elastic sealing material (36) is interposed between connection end faces (12, 15) of the segments (11, 14).

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