JP2019090301A - Shield segment joint member - Google Patents

Abstract

To provide a precast concrete product joint member that provides excellent workability and is capable of being manufactured at low costs.SOLUTION: An insertion member 340 includes: an insertion part 341 capable of being inserted into a reception engaging unit; a continuous connection part provided continuously to the insertion part 341; and an insertion engaging part 341A provided on the outside of the insertion part 341. An engaging surface part and the insertion engaging part 341A are set to be in a relation in which the engaging surface part and the insertion engaging part have a predetermined interference amount in a direction appropriately perpendicular to an insertion direction. The reception engaging unit's diameter is extended by interference between the engaging surface part and the insertion engaging part 341A at the time of inserting the insertion member 340 and is reduced by elastic force of an elastic member at the time of the interference being released. The reception engaging unit's inner peripheral surface and the insertion engaging part 341A's outer peripheral surface individually have an engaging surface appropriately perpendicular to a direction in which the insertion member 340 is pulled out. Both appropriately perpendicular engaging surfaces are engaged with each other.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a shield segment joint member for joining a plurality of shield segments, in particular, for bringing shield segments, which are two members to be joined, close to each other in a direction perpendicular to their joining surfaces and joining them together. The invention relates to a suitable shield segment joint member.

  Patent Document 1 describes a joint constituted by a female lever fixed to one member and having a push rod, and a male pin fixed to the other member and having a split. In this joint, the male pin is pushed out by pushing the rod provided inside the male pin and pushed out and fixed to the inner surface of the female pin (paragraph of Patent Document 1) 0031 to 0033, Fig. 2). In addition, Patent Document 1 also describes a joint having the same configuration as that described above, but having a weir provided at the tip of a push rod (paragraph 0043 of Patent Document 1, FIG. 5).

  Patent Document 2 describes a joint constituted by a female member fixed to one member and having an insertion hole, and a male member fixed to the other member and having a cutting line. In this joint, when the conical body is set at the distal end of the male member and pushed into the insertion port, the conical body pushes the male member by pushing the distal end of the conical body by the top plate of the female member. The male member is frictionally fixed between the cone and the inner surface of the female member (paragraphs 0008, 0010 of reference 2).

JP, 2010-236348, A JP, 2015-172320, A JP, 2009-114746, A

  In the joint by the inclined bolt described in Patent Document 1, it is necessary to fasten the bolt while maintaining the state in which the two members are accurately positioned, and there is a problem that the construction is complicated. In addition, there is a problem that the shape is complicated and the manufacturing cost is high.

  With the joints described in the cited documents 2 and 3, since the two members can be joined by moving the joining faces of the two members in the direction perpendicular to the joining face from the opposite state, inclined bolts are used. Construction is better than when used. However, there is a problem that the shape is complicated and the manufacturing cost is high.

  So, in this invention, it is an object of the present invention to provide a joint member for a shield segment which is excellent in manufacturability because the bonding load is small, the workability is good and the cost is low.

  The present invention for solving the above problems has a receiving member embedded in a first precast member made of concrete, and an insertion member embedded in a second precast member made of concrete, and the insertion into the receiving member In the shield segment joint member capable of joining the first precast member and the second precast member by inserting and fitting the member, the receiving member communicates with the opening into which the insertion member is inserted. The insertion member includes a surrounding member having an engagement portion receiving space formed by an inner circumferential surface, and a plurality of divided bodies accommodated in the engagement portion receiving space, having an engagement surface portion, and divided in the circumferential direction, A receiving engagement unit having an opening into which the connector is inserted, and a wound elastic member disposed in a winding state on the receiving engagement unit and holding the receiving engagement unit in an expandable manner And the insertion member has an insertion portion which can be inserted into the receiving and engaging unit, a connecting portion provided in series in the insertion portion, and an insertion engaging portion provided outside the insertion portion. The engagement surface portion and the insertion engagement portion are set to have a predetermined interference amount in a direction substantially perpendicular to the insertion direction, and the reception engagement unit is configured to insert the insertion member. The diameter is increased by the interference between the engagement surface portion and the insertion engagement portion, and when the interference is released, the diameter is reduced by the elastic force of the elastic member, and the inner peripheral surface of the receiving engagement unit, Each of the outer peripheral surfaces of the insertion engagement portion has an engagement surface substantially perpendicular to the pulling direction of the insertion member, and the substantially perpendicular engagement surfaces are engaged with each other.

  In the joint member for a shield segment according to the present invention, the surrounding member has a predetermined eccentricity allowance gap capable of eccentrically storing the receiving and engaging unit with respect to any radial direction. It has an inward flange portion having a space and having an opening larger than the outer diameter of the insertion engaging portion and smaller in diameter than the outer diameter of the receiving engaging unit, The coupling unit is contracted toward the insertion direction for centering guide which guides the axial center of the receiving and engaging unit to coincide with the axial center of the insertion portion inserted into the opening into which the insertion portion is inserted. A guide surface having a diameter, and the insertion of the insertion portion allows the axial center of the insertion portion and the axial center of the receiving and engaging unit to spontaneously coincide with each other to absorb an insertion position error of the insertion member It is characterized in that

  Further, in the joint member for a shield segment of the present invention, the surrounding member is screwed and embedded in the anchor in a state where the receiving and engaging unit is stored in the engaging portion receiving space, the first precast The outer end surface of the inward flange portion exposed from the member has an engagement recess engageable with a tool for screwing and / or unscrewing the enclosing member, and the inward flange portion It is characterized by having an outer peripheral surface diameter-reduced toward the back side of the insertion direction of the said insertion part from the said outer end surface side.

  Furthermore, in the joint member for a shield segment of the present invention, the receiving and engaging unit is covered by a waterproof film capable of closing the opening.

  According to the present invention, high tensile strength can be exhibited while being able to be manufactured at extremely low cost and bonding with extremely low load, and joint members can be rusted even by rain water or the like due to product storage outdoors. It is possible to provide a joint member for a shield segment which can be prevented and which can absorb insertion position deviation and has good workability.

FIG. 1 is a cross-sectional view of a receiving member with an anchor. FIGS. 2A to 2C illustrate components of the receiving member. FIG. 3 is a cross-sectional view of the insertion member. FIG. 4 is an end view of the surrounding part which comprises the receiving member. FIG. 5 is a cross-sectional view of the engaging portion that constitutes the receiving member. 6 (A) and 6 (B) are diagrams for explaining the winding spring constituting the engaging portion. FIGS. 7A and 7B are diagrams for explaining the split cores constituting the engaging portion. FIGS. 8A and 8B are diagrams for explaining an engagement portion covered by a rustproof film. FIG. 9 is a cross-sectional view of a state in which the insertion member is inserted into the receiving member provided with the anchor. FIG. 10 is a view for explaining the centering function of the engaging portion. FIGS. 11A and 11B are diagrams for explaining a state in which the axial center position of the insertion member inserted into the engaging portion is deviated from the axial center position of the anchor. 12 (A) and 12 (B) are diagrams showing the insertion completed state in which the axial center position of the insertion member is inserted into the engaging portion in a state of being shifted from the axial center position of the anchor. FIG. 13 is a view for explaining the case where the surrounding portion is removed from the embedded receiving member.

  The joint member for a shield segment in the present invention includes a receiving member embedded in a first precast concrete member made of precast concrete, and an insertion member embedded in a second precast member which is a concrete product. Here, examples of the shape of the first precast member and the second precast two member include shapes such as a curved plate shape, a columnar shape, and a block shape.

  Next, the receiving member will be described. FIG. 1 is a longitudinal cross-sectional view of the receiving member 300 attached to the anchor 330. The receiving member 300 comprises a separately formed enclosure 310 and a receiving engagement 320.

  The surrounding portion 310 is configured such that the anchor 330 is detachably screw-engaged with the end on the back side. The anchor 330 has an externally threaded end portion 331, as shown in the longitudinal sectional view of FIG. 2 (A). The anchor 330 is fixed to the surrounding portion 310 by being screwed from the end face side, and the end face 331A of the anchor 330 forms the end face of the engagement portion receiving space 311. Ribs 332 are provided on the outer peripheral surface of the anchor 330. Also, a recess 333 is provided at the distal end of the anchor 330 so as to secure a space for accommodating the distal end of the insertion member 340 inserted into the receiving member 300.

  Incidentally, instead of providing the recess 333 at the distal end of the anchor 330, a sleeve member is interposed between the distal end of the anchor 330 and the receiving engagement portion 320, and the distal end of the insertion member 340 is accommodated by the sleeve member. You may secure a space for Also, the sleeve member can be integral with the receiving and engaging portion 320.

  As shown in the longitudinal sectional view of FIG. 2C, the surrounding portion 310 is formed of a cylindrical body forming a cylindrical engaging portion receiving space 311 having a diameter Db larger than the outer diameter Da of the receiving engaging portion 320. Thus, the receiving and engaging portion 320 shown in the longitudinal sectional view of FIG. 2B can be accommodated in the engaging portion receiving space 311.

  The surrounding portion 310 is smaller than the outer diameter Da of the receiving and engaging portion 320, and an opening 312 having a diameter Dd larger than the outer diameter Dc of the inserting and engaging portion 341A of the insertion member 340 shown in the longitudinal sectional view of FIG. The inward flange portion 313 thus provided is provided at the other end, and the insertion engagement portion 341A of the insertion member 340 can be inserted into the engagement portion receiving space 311 through the opening portion 312.

  The inward flange portion 313 is provided perpendicularly to the peripheral wall of the surrounding portion 310, but stress concentrates on the corner portion where the corner portion continuous with the peripheral wall is erected at a right angle, so the corner portion is continuous in a curved surface Thus, the stress concentrated on the corner portion is dispersed to improve the durability. Of course, the present invention is not limited to this, and the inward flange portion 313 may be formed in a tapered shape so that the inner circumferential surface has a substantially conical or funnel shape.

  The opening portion 312 of the surrounding portion 310 is formed in a circular shape centered on the axial center position of the anchor 330 and the surrounding portion 310 connected by screwing, and the axial center position of the insertion member 340 to be inserted is shifted. The guide member 313 has a conical guide surface 313A for guiding the distal end of the insertion member 340 in the center direction.

  Further, as shown in FIG. 4, in the inward flange portion 313, an engagement concave portion 315 into which a tool for screwing the surrounding portion 310 coupled by screwing to the anchor 330 is opened is opened. It is radially formed from the portion 312 toward the outer periphery. The engagement concave portion 315 is communicated with the outer peripheral edge to prevent the flow into the engagement concave portion 315 when the green concrete flows in the mold at the time of embedding the surrounding portion 310 and the like in concrete. It may be a groove or a hole which is not formed.

  Furthermore, the surrounding portion 310 is formed in a tapered shape so that the outer peripheral surface decreases in diameter from the front end side to the rear end side. That is, the surrounding portion 310 is formed so as to gradually increase in diameter along the axial direction from the anchor 330 side.

  As shown in FIG. 3, the insertion member 340 is integrated with the insertion portion 341 inserted into the insertion portion receiving space 321B (see FIG. 5) of the receiving member 300 shown in FIG. A connecting portion 342 is provided. The insertion portion 341 is provided with an insertion engagement portion 341A having an engagement surface which is perpendicular to the axial direction on the outer peripheral surface and an engagement surface portion in which an inclined surface which is inclined to decrease in diameter toward the tip end is repeatedly formed. It is done.

  The tip of the insertion portion 341 is processed into a truncated cone shape having an inclined surface 343 for insertion guide, and further, a hole 344 into which a hexagonal wrench, for example, a tool for screwing the insertion member 340 is inserted It is provided at the center of the tip. Of course, the insertion portion 341 and the connecting portion 342 may be integrally formed into one member or separately formed and integrally provided by welding or the like. A rib 342A is provided on the outer peripheral surface of the connecting portion 342.

  As shown in the cross sectional view of FIG. 5, the receiving and engaging portion 320 is integrally formed by resiliently pressing the outer peripheral side of the three divided cores 321 each having a fan-shaped cross section by the winding spring 322 and restricting the position. It consists of a cylindrical body with a substantially cylindrical shape. Of course, needless to say, the resilient pressing force by the winding spring 322 may be generated only when the position-controlled three divided cores 321 are expanded in diameter and the relative position changes. .

  The wound spring 322 is formed in a substantially cylindrical shape having an inner diameter smaller than the outer diameter of a cylinder formed by arranging three divided cores 321 in the circumferential direction, and in the state where the diameter is enlarged against the elastic force By storing and arranging the divided cores 321, the three divided cores 321 are arranged in a wound state. When the resilient biasing force acts only at the time of diameter expansion, the outer diameters of the three split cores 321 and the outer diameter of the winding spring 322 may be set to substantially match.

  For example, as shown in the end view of FIG. 6 (A) and the side view of FIG. 6 (B), the winding spring 322 curves a plate-like spring material into a cylindrical shape so that the side edges overlap. And has a locking piece 322A in which one side edge is bent inward. When the side edges of the wound spring 322 are overlapped when wound around the split core 321, the diameter of the gap becomes different, and the balance of the pressing force acting on the outer periphery of the split core 321 is deteriorated. Therefore, the winding spring 322 is expanded in diameter in the state of being wound around the split core 321 as shown in FIG. 5 so that the end portions do not overlap.

  The three split cores 321 on which the winding spring 322 is wound are elastically pressed at the outer peripheral side in a state of being positionally restricted in the circumferential direction by the locking pieces 322A and positionally restricted. On the other hand, the receiving and engaging portion 320 is formed of a substantially cylindrical tubular body integrated so as to be able to expand in diameter.

  Here, as shown in the end view of FIG. 7A and the cross sectional view of FIG. 7B, the three split cores 321 constituting the receiving and engaging portion 320 basically have a central angle of about 120. The cylinder has a cross-sectional shape of a fan-like shape, and is a configuration in which the cylinder is divided into three in the circumferential direction, but it is not limited to this. Even if it is divided into two, it is divided into four or more It is also good. The side surfaces of the split core 321 in the circumferential direction are cut by the thickness t of the locking piece 322A.

  The scraping amount corresponding to the thickness t of the locking piece 322A is scraped by only one of the three split cores 321 in the receiving and engaging portion 320 shown in FIG. The central angles may be made to coincide by equally dividing the amount of reduction corresponding to the thickness t and cutting all three divided cores 321.

  When using a locking piece 322A in which a plate-like spring material is bent along the entire length of the side edge, it is necessary to make the central angle of at least one of the three split cores 321 smaller than 120 °. However, if the locking piece 322A is formed by bending a part of the entire length of the side edge of the plate-like spring material, the position regulating function in the circumferential direction by the locking piece 322A can be secured. In this case, a groove corresponding to the locking piece 322A may be formed in at least one or more of the split cores 321, and all of the three split cores 321 have a fan-shaped cross section having a basic central angle of 120 °. It can be done. Of course, the locking piece 322A at the circumferential end of the winding spring 322 is not necessarily provided, and if not provided, the arrangement of the split core relative to the winding spring 322 can not be phased, but The central angle can also be set to 120 °.

  The inner peripheral surface of the cylindrical body of the receiving and engaging portion 320 formed of a cylindrical tubular body constituted by three divided cores 321 wound with the winding spring 322 has the outer shape of the insertion engaging portion 341 of the insertion member 340. It has an accommodating space 321B which is a matching engagement surface 321A and is surrounded by the engagement surface 321A. The three split cores 321 have an engagement surface perpendicular to the axial direction, which becomes the engagement surface portion 321A, in the surface corresponding to the inner peripheral surface of the cylinder, and the diameter decreases from the joint surface side toward the back side An inclined surface which is inclined as described above is repeatedly formed.

  The surrounding portion 310 is screwed to the anchor 330 in a state where the receiving and engaging portion 320 is accommodated in the engaging portion receiving space 311 as shown in FIG. 1.

  The receiving and engaging portion 320 is disposed in the engaging portion receiving space 311 so as to be movable or eccentrically by being accommodated in a cylindrical engaging portion receiving space 311 having a diameter Db larger than its outer diameter Da. Be done.

  Then, the receiving and engaging portion 320 guides the axial center of the receiving and engaging portion 320 to the opening 320A in which the insertion portion 341 of the insertion member 340 is inserted so as to coincide with the axial center of the insertion portion 341 to be inserted. There is a guide surface having a diameter decreasing toward the insertion direction for centering guide, and insertion of the insertion portion 341 causes the axial center of the insertion portion 341 and the axial center of the receiving engagement portion 320 to coincide spontaneously and insert The insertion position error of the member 340 can be absorbed. Here, the guide surface of the opening 320A is provided so as to form a conical inclined surface 320B which decreases in diameter along the direction of insertion, but is not particularly limited. It may be made.

  In the inclined surface 320 B provided in the opening 320 A of the receiving and engaging portion 320, the axial center position of the insertion member 340 inserted into the engaging portion receiving space 311 via the opening 312 of the surrounding portion 310 corresponds to the anchor 330. When the distal end portion of the insertion member 340 is inserted into the opening 320A of the receiving and engaging portion 320 in the eccentric state out of the axial center position, the receiving and engaging portion 320 is moved, and the inserting member 340 It functions as a guide for aligning the opening position of the inserted receiving engagement portion 320 with the axial center position of the insertion member 340

  Further, the receiving and engaging portion 320 in the receiving member 300 is entirely covered with an anticorrosion film 325 which can be broken by the insertion of the insertion member 340, whereby the anticorrosion treatment is performed.

  Here, in the steel receiving and engaging portion 320, when moisture in the air comes in contact with the surface, an electrical reaction starts with air dissolved in the moisture, and iron is gradually ionized and dissolved in the moisture. After that, the ionized iron is combined with hydroxide ions in the moisture to become iron hydroxide and appear as rust on the surface of the metal, which may deteriorate the durability.

  In particular, there is a risk that deterioration due to rust may progress when stored in a field condition, but the receiving engagement portion 320 is subjected to an anticorrosion treatment to prevent deterioration due to rust. Durability performance can be secured.

  Here, as shown in FIG. 8A, the insertion member 340 is inserted into the opening portion 312 formed in the inward flange portion 313 of the surrounding portion 310 integrated with the anchor 330 by screwing. As shown in FIG. 8 (B), the distal end of the front end is inserted into the engaging portion receiving space 311 in the surrounding portion 310 through the opening portion 312, thereby the engaging portion receiving space 311 of the surrounding portion 310. The anticorrosion film 325 covering the receiving and engaging portion 320 housed inside is pierced and inserted into the insertion portion receiving space 321 B of the receiving and engaging portion 320.

  As described above, the receiving and engaging portion 320 in the receiving member 300 is integrated so as to be able to expand in diameter against the elastic force of the winding spring 322 by the three split cores 321 around which the winding spring 322 is wound. Since the cylindrical portion is formed as a cylindrical body, the distal end of the insertion portion 341 of the insertion member 340 is expanded by being inserted into the insertion portion receiving space 321B of the receiving and engaging portion 320.

  That is, in the three divided cores 321 whose positions are restricted by the resilient tightening force by the resilient force of the winding spring 322, the tip end of the insertion portion 341 of the insertion member 340 is the insertion portion reception of the receiving engagement portion 320 When inserted into the space 321B, the three split cores 321A are wound around the spring by the engagement surface portion on the engagement portion side of the reception engagement portion 320 interfering with the engagement surface portion on the insertion member 340 side. It moves against the elastic clamping force due to the elastic force of 322 and is in a state of diameter expansion, and the apex of the engagement surface on the insertion member 340 side is the apex of the engagement surface on the reception engagement part 320 side. Interference with the engaging surface portion on the insertion member 340 side is released, and the three split cores 321A are resiliently resilient due to the resilient force of the winding spring 322. Back to the diameter by It becomes a state. As a result, as shown in FIG. 9, the end of the insertion portion 341 of the insertion member 340 can be easily inserted to the end position of the back of the insertion portion receiving space 321B with an extremely small insertion load (for example, 0.3 kN or less) it can.

  In the insertion portion 341 of the insertion member 340 whose distal end is inserted to the end position of the insertion portion reception space 321B, the outer peripheral surface of the reception engagement portion 320 is elastically restricted by the elastic force of the winding spring 322. By the diameter reduction state, the insertion engagement portion 341A reliably engages with the engagement surface portion 321A of the reception engagement portion 320.

  The tip of the insertion portion 341 of the insertion member 340 is inserted into the insertion portion reception space 321B of the reception engagement portion 320 stored in the engagement portion reception space 311 of the surrounding portion 310, and the anticorrosion film 325 is broken. Since it is covered with the anticorrosion film 325 up to the above, deterioration due to rust does not occur during the storage period, and predetermined durability can be exhibited.

  The opening 312 formed in the inward flange 313 of the surrounding portion 310 has a conical guide surface 313A, and the diameter of the tip of the insertion portion 341 of the insertion member 340 is reduced. Since the conical inclined surface 343 is provided, the inward direction of the surrounding portion 310 integrated with the anchor 330 by screwing the tip end of the insertion portion 341 of the insertion member 340 integrated with the connecting portion 342 by screwing. When the axial center of the insertion portion 341 is out of the center of the opening portion 312 when inserted into the opening portion 312 formed in the flange portion 313, the insertion portion is provided at the tip of the insertion portion 341 of the insertion member 340 The inclined surface 343 is guided by the guide surface 313A of the opening 312 on the inward flange portion 313 side. Therefore, the tip of the insertion portion 341 of the insertion member 340 can be easily inserted into the opening 312 on the inward flange portion 313 side.

  Furthermore, in the insertion portion receiving space 321B of the surrounding portion 310 in which the tip end of the insertion portion 341 of the insertion member 340 is inserted through the opening portion 312 on the inward flange portion 313 side, the receiving engagement portion 320 is in the radial direction. Since it is provided movable or eccentrically, and is provided on the conical inclined surface 320B at the opening 320A of the receiving engagement portion 320, the tip of the insertion member 340 to the opening 320A of the receiving engagement portion 320 The conical inclined surface 320B is guided to the opening 320A of the receiving / engaging portion 320 by the inclined surface 343 provided at the tip of the insertion portion 341 of the insertion member 340 with the insertion of the part, and the diameter of the receiving / engaging portion 320 The position of the opening of the receiving and engaging portion 320 where the insertion member 340 is inserted can be made to coincide with the axial position of the insertion member 340 by automatically moving in the direction.

  That is, since the receiving member 300 has an inner circumferential surface of rotational symmetry with respect to the axial center of the insertion member 340 inserted into the receiving engagement portion 320, the receiving member 300 has a radial direction from the axial center position of the anchor 330. In any orientation, the insertion of the insertion member 340 has a self-centering function of aligning the axial center of the insertion member 340 with the axial center of the receiving engagement portion 320.

  The insertion member 340 is shown in FIG. 10 when it is inserted into the storage space 311 via the opening portion 312 of the surrounding portion 310 in a state where the axis S1 position coincides with the axis S2 position of the anchor 330. As described above, the insertion is completed in a state in which the receiving and engaging portion 320 is automatically aligned to a position having an equal space around the periphery in the storage space 311. When the insertion is completed, the distal end of the insertion member 340 inserted into the receiving member 300 is accommodated in the space secured by the recess 333 provided at the distal end of the anchor 330.

  Also, as shown in FIG. 11A and FIG. 11B, with the position of the axial center S1 of the insertion member 340 deviated from the axial center S2 position of the anchor 330, through the opening 312 of the surrounding portion 310. When it is inserted into the storage space 311, as shown in FIG. 12B, the opening position of the receiving engagement portion 320 is made to coincide with the axial center position of the inserted insertion member 340, and the engagement portion Insertion is completed in a state in which the receiving and engaging portion 320 is automatically aligned to a position state having an uneven space around the inside of the storage space 311.

  11A, 11B, and 12B show states where the axial center S1 position of the insertion member 340 deviates below the axial center S2 position of the anchor 330 on the paper surface. It is shown.

  FIG. 12A shows the insertion completed state in the case where the axial center S1 position of the insertion member 340 is deviated to the upper side of the axial center S2 position of the anchor 330 on the paper surface.

  Accordingly, even when the axial center S1 position of the insertion member 340 inserted into the storage space 311 through the opening of the surrounding portion 310 is in an eccentric state deviated from the axial center S2 position of the anchor 330, The insertion member 340 can be easily inserted into the insertion portion receiving space 321 B of the receiving engagement portion 320 housed in the engaging portion receiving space 311.

  By the way, the surrounding portion 310 in the receiving member 300 engages the tool in the inward flange portion 313 and the engagement concave portion 315 radially formed from the opening portion 312 to the outer periphery, and the axial center of the anchor 330 is obtained. By rotating the surrounding portion 310 in the forward direction, it can be screwed into engagement with the anchor 330.

  Further, in a state where the receiving and engaging portion 320 is accommodated in the engaging portion receiving space 311, the surrounding portion 310 screwed to the anchor 330 engages a tool to the engaging concave portion 315 and the shaft of the anchor 330 It is also possible to unscrew and remove from the anchor 330 by rotating the surrounding portion 310 in a reverse direction.

  When the receiving member 300 is used, the surrounding portion 310 connected by screwing to the anchor 330 is embedded in the concrete body by the precast together with the anchor 330 while the receiving engaging portion 320 is accommodated in the engaging portion receiving space 311. Be done.

  In the construction site or factory, after the receiving member 300 is embedded together with the anchor 330, the receiving engaging portion 320 stored in the engaging portion receiving space 311 of the surrounding portion 310 is damaged or disposed in the opposite direction. As shown in FIG. 13, the inward flange portion 313 having the opening portion 312 for inserting the insertion member 340 is also before the completion of the insertion of the insertion member 340 even when a defect such as the case of having been detected is found. In addition, since the outer surface is exposed, it is possible to stop the insertion operation of the insertion member 340, remove the receiving member 300 from the anchor 330, replace the receiving engagement portion 320, or the like.

  In addition, the surrounding portion 310 of the receiving member 300 has a tapered outer peripheral surface 310A in which the outer diameter of the end on the inward flange portion 313 side is larger than the outer diameter of the end on the opposite side to the inward flange portion 313. Therefore, even after implantation, it can be easily removed from the anchor 330 by rotating the surrounding portion 310 in the opposite direction about the axis of the anchor 330 using the tool 500. .

  In this manner, the surrounding portion 310 is exposed to the outside surface of the inward flange portion 313 exposed in a state of being screwed and embedded in the anchor 330 in a state in which the receiving engagement portion is accommodated in the engagement portion receiving space 311. There is an engagement recess for unlocking into which the tool 500 for screwing the surrounding portion 310 can be inserted, and the outer diameter on the inward flange portion 313 side than the outer diameter on the opposite side to the inward flange portion 313 By having the tapered outer circumferential surface 310A having a large diameter, the tool 500 can be easily screwed off and can be removed from the anchor 330 even in a state of being screwed and embedded in the anchor 330.

  It should be noted that, instead of the radially-formed engagement concave portions 315, a plurality of engagement concave portions are concentrically distributed around the opening portion 312 of the inward flange portion 313 in a radial direction. It is also good. Further, instead of the engagement concave portions, concave portions of various shapes adapted to the tool such as grooves or round holes may be provided.

  DESCRIPTION OF SYMBOLS 300 Receiving member, 310 surrounding part, 310A outer peripheral surface of surrounding part, 311 engaging part receiving space, opening of surrounding part, 313 inward flange part, 313A guide surface, 315 engaging concave part, 320 receiving engaging engagement Part, opening of 320A receiving engagement part, 320B inclined surface, 321 divided core, 321A engaging surface part, 321B insertion part receiving space, 322 wound spring (biasing means), 322A locking piece, 325 rustproof film, 330 Anchor, 333 recessed portion, 340 insertion member, 341 insertion portion, 341A insertion engagement portion, 343 inclined surface

Claims (4)

The receiving member which is embedded in the first precast member made of concrete, and the insertion member which is embedded in the second precast member made of concrete, and the insertion member is inserted into and fitted to the receiving member. In a joint member for shield segment capable of joining a first precast member and the second precast member,
The receiving member is
A surrounding member in which an engagement portion receiving space communicating with the opening into which the insertion member is inserted is formed by an inner peripheral surface;
A receiving and engaging unit having an engaging surface portion, comprising a plurality of circumferentially divided divisions, housed in the engaging portion receiving space, and having an opening into which the insertion member is inserted;
A wound elastic member disposed in a wound state on the receiving engagement unit and holding the receiving engagement unit in an expandable manner;
The insertion member is
An insert that can be inserted into the receiving and engaging unit;
A connecting portion provided in series in the insertion portion;
And an insertion engaging portion provided outside the insertion portion,
The engagement surface portion and the insertion engagement portion are set to have a predetermined interference amount in a direction substantially perpendicular to the insertion direction,
The diameter of the receiving and engaging unit is increased by the interference between the engaging surface portion and the inserting and engaging portion when the insertion member is inserted, and the diameter is reduced by the elastic force of the elastic member when the interference is released. And
The inner peripheral surface of the receiving and engaging unit and the outer peripheral surface of the insertion engaging portion each have an engaging surface substantially perpendicular to the withdrawal direction of the insertion member, and the substantially perpendicular engaging surfaces A joint member for a shield segment characterized in that: The enclosing member has the engaging portion receiving space having a predetermined eccentricity allowance gap capable of eccentrically accommodating the receiving and engaging unit with any radial direction, and the insertion engaging portion And an inward flange portion having an opening portion set larger than the outer diameter of the housing and smaller than the outer diameter of the receiving and engaging unit,
The receiving and engaging unit is inserted in the insertion direction for guiding a centering axis of the receiving and engaging unit so as to coincide with the axis of the inserting portion in the opening where the insertion portion is inserted. Has a guiding surface that reduces in diameter towards
By the insertion of the insertion portion, the axial center of the insertion portion and the axial center of the receiving and engaging unit are made to spontaneously coincide with each other to absorb an insertion position error of the insertion member. The joint member for a shield segment according to claim 1. The surrounding member is
The outer end surface of the inward flange portion exposed from the first precast member in a state in which the receiving and engaging unit is screwed and embedded in the anchor in a state in which the receiving and engaging unit is accommodated in the engaging portion receiving space It has an engagement recess which can be engaged with a tool for screwing and / or unscrewing the member;
The joint member for a shield segment according to claim 2, further comprising: an outer peripheral surface whose diameter decreases from the outer end surface side of the inward flange portion toward the rear side in the insertion direction of the insertion portion.   The joint member for a shield segment according to any one of claims 1 to 3, wherein the receiving and engaging unit is covered by a waterproof film capable of closing the opening.

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