JP4954041B2 - Precast member joint and precast member provided with the joint - Google Patents

Description

  The present invention relates to a precast member such as a tunnel lining segment, a lining plate, a paving slab, or a tank wall, for improving the efficiency of joining work, improving workability, making the precast member surface deficient and economical. The present invention relates to the structure of the joint and the precast member provided with the joint, and is particularly effectively applied to a small precast member such as a small diameter tunnel lining segment.

  Conventionally, the segment connection method used in the shield method is often coupled by bolts. Therefore, 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 etc. opens on the inner surface side) Therefore, there is a disadvantage that secondary lining is necessary.

  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 so that the secondary lining can be omitted, bolt joints are unnecessary, and assembly is automated and labor-saving. (For example, refer to Patent Documents 1 to 3).

  However, since there are various problems to be solved even in these buried type joint structures, joints of precast members that can solve these problems have been developed (see Patent Document 4). According to the invention of Patent Document 4, in a buried joint structure, it is possible to easily cope with manufacturing errors and assembly errors while ensuring a compact structure without dimensional constraints, and to securely engage male and female joints. Thus, a precast member joint excellent in workability and economy that can sufficiently resist pull-out force and shear force on the joint surface is obtained.

  FIG. 5A shows an example of the basic structure of the invention of Patent Document 4. The male joint 11 protrudes from an anchor portion 12 such as a deformed steel bar embedded in the precast member and the joint surface of the precast member. 1-stage or 2-stage reduced-diameter portions 14 are formed on the outer peripheral surface of the protrusion 13. The female joint 21 is composed of an anchor portion 22 and a head portion 23 embedded in the precast member. The head portion 23 is a hollow portion that opens to the joint surface of the precast member and into which the protruding portion 13 of the male joint 11 is fitted. 28 is formed. Further, an annular groove 24 is formed on the inner surface of the head portion 23 at a position corresponding to the reduced diameter portion 14 in a state where the protruding portion 13 enters and fits, and the inner diameter in the contracted state is formed in the annular groove 24. An annular spring 25 is mounted as an annular elastic member which is smaller than the outer diameter of the protruding portion 13 and can be elastically expanded and contracted in the radial direction.

  When the male joint 11 is inserted into the female joint 21, the protruding portion 13 basically enters while expanding the annular spring 25, and further enters, so that the annular spring 25 is fitted into the reduced diameter portion 14. The annular spring 25 straddles the annular groove 24 and the reduced diameter portion 14 to resist the pulling force acting on the joint portion. In addition, the annular spring 25 can be held in a diameter-expanded state in advance by the diameter-enlarged holding tool 27 attached to the inner diameter side of the annular spring 25.

JP 2000-248898 A JP-A-8-296396 JP 2001-90485 A JP 2003-155896 A

  When the joint structure of Patent Document 4 described above is applied to a small precast member such as a small-diameter tunnel lining segment, the male joint and the female joint are also small, so FIG. 5 (b) As shown in FIG. 3, since the width of the annular groove 24 provided in the female joint 21 is reduced, a cutting tool (bored grooving bite) H with a long blade edge must be used for cutting the groove. There is a high risk of breakage such as breakage, and there are problems such as a major obstacle when mass-producing products.

  The present invention is intended to solve the above-described problems, and even in a small joint of a small precast member such as a small-diameter tunnel lining segment, a female joint can be manufactured using an annular groove and an annular spring. It is an object of the present invention to provide a precast member joint and a precast member including the joint that can be mass-produced at a low cost with a small joint.

The joint of the precast member according to claim 1 of the present invention is 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 on the other precast member. The male joint has a rod-like protrusion that protrudes from the joint surface of the one precast member, and a reduced diameter portion is formed on the outer peripheral surface of the protrusion. 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, An annular elastic member that can elastically expand and contract In joint precast member being,
The female joint is divided into a cylindrical head body provided with the annular groove and a rod-like anchor body connected to the head body. The head body is hollow on the joint surface side with the annular groove interposed therebetween. A hole (inlet portion of the hollow part) is formed, and on the opposite side, an enlarged hole having a hole diameter larger than the hole diameter of the hollow part hole and smaller than the hole diameter of the annular groove is formed. Has a hollow hole (internal part of the hollow part), and the head body and the anchor body are integrated by inserting the end of the anchor body into the enlarged hole of the head body, thereby integrating the head body and the anchor body. A hollow portion and an annular groove are formed by the anchor body and the anchor body.

  As shown in FIGS. 1 and 2, the present invention divides a female joint of a buried type annular groove / annular spring type joint structure into two members and combines them to form a female joint. It is. In addition, the head is divided into a cylindrical head body having an annular groove and a rod-shaped anchor body. The head body is provided with an enlarged hole on the anchor body side of the annular groove, and the annular groove for cutting is shallowed by the enlarged hole. The enlarged hole is used as a mounting hole for the anchor body, and an annular groove having a predetermined depth is formed by pairing the head body and the anchor body.

  When manufacturing the head body, after cutting the hollow hole and the enlarged hole, the annular groove is cut at the bottom of the enlarged hole, but the depth of the annular groove is reduced by the enlarged hole. A cutting tool with a short cutting edge (boring groove cutting tool) can be used for cutting (see Fig. 2), the risk of cutting tool damage is greatly reduced, and mass production of small female joints with a small groove width is possible. It becomes.

  The end of the anchor body is fitted into the enlarged hole of the head body, and the head body and the anchor body are joined by fillet welding between the head body end surface and the anchor body outer peripheral surface (see FIG. 1 (a)). Alternatively, a female screw is cut into the enlarged hole, a male screw is cut at the end of the anchor body, and the screws are joined (see FIG. 1B). In addition, bonding with an adhesive may be used. A deep annular groove is formed by the shallow bottom groove of the integrated head body and the distal end surface of the anchor body, and a hollow portion into which the protrusion of the male joint is inserted is formed by the hollow hole of the head body and the hollow hole of the anchor body. Is done. For the head body and the anchor body, reinforced plastic, ceramics or the like is used in addition to metal by casting or forging.

The joint of the precast member according to claim 2 of the present invention is the joint of the precast member according to claim 1, wherein the outer peripheral surface of the end portion on the head body side of the anchor body has a length corresponding to the length of the enlarged hole. The reduced-diameter shaft portion is formed, the reduced-diameter shaft portion is inserted into the enlarged hole, and a side wall surface on one side of the annular groove is configured by the end surface on the head body side of the reduced- diameter shaft portion. It is a joint of members.

  By locking the stepped portion of the reduced diameter shaft portion provided at the end of the anchor body to the end surface of the head body, the side wall surface on one side of the annular groove can be easily formed by the tip surface of the reduced diameter shaft portion. it can. Here, an annular groove can be formed with high precision by providing a counterbore as an allowance for the manufacturing error of the head on the locking end surface of the head.

  The joint of the precast member according to claim 3 of the present invention is the joint of the precast member according to claim 1 or 2, wherein the anchor body of the female joint is a deformed steel bar. It is a joint. An anchor body can be obtained simply by processing the attachment portion to the enlarged hole at the end of the deformed steel bar, and an inexpensive and small female joint can be obtained.

  The joint of the precast member according to claim 4 of the present invention is the joint of the precast member according to any one of claims 1 to 3, wherein the male joint has a rod shape at the tip of the anchor portion made of deformed steel bar. It is a joint of the precast member characterized by the above-mentioned protrusion part being provided. An inexpensive and small male joint can be obtained.

  A precast member according to claim 5 of the present invention is a precast member in which a plurality of female joints according to any one of claims 1 to 3 are installed on a joint surface.

  It is possible to apply a buried type annular groove / annular spring female joint to a precast member such as a relatively small tunnel lining segment, lining plate, paving plate, or storage wall. In a relatively small precast member joint, it is possible to improve the efficiency of the joining work, improve the workability, make the surface of the precast member defect-free and make it economical.

  (1) The female joint of the buried groove type annular groove / annular spring joint structure is divided into two parts, the head body and the anchor body, and the head body is provided with an enlarged hole on the anchor body side of the annular groove. Since the annular groove is made shallower, it is possible to use a blade with a short cutting edge to cut the annular groove, greatly reducing the risk of blade damage, and mass production of small female joints with a small groove width. Can be realized.

  (2) The enlarged hole of the head can be used as the mounting hole of the anchor body, and a small female joint can be manufactured at low cost.

  (3) Embedded type annular groove / annular spring type female joints can be used for relatively small precast members, making joining work more efficient, improving workability, eliminating precast member surfaces and reducing economy Can be achieved.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a partial sectional view showing an example of a female joint of the present invention. FIG. 2 is a cross-sectional view showing an example of each part of the female joint of the present invention. FIG. 3 is a perspective view showing an example of the fitting operation between the female joint and the male joint of the present invention. FIG. 4 is a cross-sectional view sequentially illustrating the joining operation of the precast member by the female joint and the male joint of the present invention.

  As shown in FIGS. 1 and 3, the joint of the precast member includes a male joint 11 and a female joint 21. As shown in FIG. 3, the male joint 11 has a protruding portion 13 formed at the tip of the anchor portion 12, and as shown in FIG. 1, the female joint 21 basically comprises an anchor portion 22 and a head portion 23. An annular groove 24 and a hollow portion 28 are formed in the head portion 23. As shown in FIG. 4, the male joint 11 is embedded in the precast member so that the protruding portion 13 protrudes from the joint surface of the precast member, and the female joint 21 is flush with the joint surface of the precast member. It is embedded in the precast member.

(1) Structure of the present invention In the present invention, as shown in FIGS. 1 and 2, the female joint 21 is divided into a disk-shaped head body 31 and a rod-shaped anchor body 32, and each is manufactured separately. The combined female joint 21 is obtained. The head 23 is constituted by the joint body 31 and the joint end of the anchor body 32. Further, as will be described in detail later, the head body 31 is provided with an enlarged hole 33, the annular hole 24 for cutting is shallowed by the enlarged hole 33, and the enlarged hole 33 is used as an attachment hole for the anchor body 32. The shallow bottom groove 24a of the head body 31 and the distal end surface 24b of the anchor body 32 form an annular groove 24 having a small groove width and a deep groove depth. The head body 31 and the anchor body 32 may be made of metal by casting or forging, reinforced plastic, ceramics, or the like.

(2) Female Joint Head and Anchor Body As shown in FIGS. 1 and 2, the head body 31 is formed with an annular groove 24 at substantially the center in the axial direction, and the joint surface of the hollow portion 28 on the joint surface side. A hollow hole 28a constituting the inlet portion on the side is formed, and an enlarged hole 33 having a hole diameter larger than the hole diameter of the hollow hole 28a and smaller than the hole diameter of the annular groove 24 is formed on the anti-joint surface side (anchor body side).

  When manufacturing the head body 31, for example, as shown in FIG. 2 (a), a disc having a predetermined thickness is bored from one side to form a hollow hole 28a, and from the opposite side to the hollow hole 28a. The enlarged hole 33 is formed by boring, and then the bottom of the enlarged hole 33 is bored to form the bottom groove 24 a of the annular groove 24. Since the bottom groove 24a is shallow due to the enlarged hole 33, a boring groove cutting tool H with a short cutting edge can be used, the risk of damage to the blade is greatly reduced, and the width of the annular groove 24 is small. Can be mass-produced. In the illustrated example, finally, an annular groove 24 having a semi-oval cross section with a groove width of about 4 to 5 mm and a groove depth of about 8 to 9 mm is obtained.

  As shown in FIG. 2 (a), the anchor body 32 uses a deformed steel bar in the illustrated example, and the inner portion of the hollow portion 28 on the side opposite to the joint surface is formed at the end of the joint surface side (head body side). The bottomed hollow part hole 28b which comprises is formed. As shown in FIG. 1, when the head body 31 and the anchor body 32 are combined, the hollow portion 28 is formed by the hollow portion hole 28 a of the head body and the hollow portion hole 28 b of the anchor body that are located across the annular groove 24. Configure as follows. A mold fixing screw hole 34 is formed at the bottom of the hollow hole 28b.

  Further, as shown in FIG. 2 (a), the outer peripheral surface at the end of the anchor body 32 on the joint surface side has an outer diameter slightly smaller than the diameter of the enlarged hole 33 and smaller than the outer diameter of the anchor body 32. The reduced diameter shaft portion 35 is formed, and the reduced diameter shaft portion 35 is fitted into the enlarged hole 33, screwed, or bonded, whereby the anchor body 32 is assembled to the head body 31. The length of the reduced diameter shaft portion 35 is matched with the length of the enlarged hole 33, and when the stepped portion 35a is locked to the rear surface of the head body 31, as shown in FIG. A side wall surface 24b on one side of the annular groove 24 is configured.

  Further, as shown in FIG. 2 (b), a counterbore 36 is formed on the rear surface of the head body 31. The counterbore 36 absorbs manufacturing errors of the head body 31, and all the dimensions A, B, and C are obtained. The dimensions can be processed with high accuracy.

  In FIG. 1A, the rear surface of the head body 31 and the outer peripheral surface of the anchor body 32 are joined by the fillet weld 40, and the head body 31 and the anchor body 32 are integrated. Thus, a hollow portion 28 into which the protruding portion 13 of the male joint 11 is fitted and inserted, and an annular groove 24 in which an annular spring 25 as an annular elastic member is mounted are formed in the head portion 23 of the female joint 21.

  As shown in FIG. 1 (b), a male screw can be cut into the reduced diameter shaft portion 35, a female screw can be cut into the enlarged hole 33, and integrated by screw joining. In addition, bonding with an adhesive may be used.

(3) Male Joint As shown in FIG. 3, in the male joint 11, for example, a deformed steel bar is used for the anchor portion 12, and a reduced diameter portion 14 is formed on the rod-like protruding portion 13. Further, the tip of the protruding portion 13 is processed into a tapered shape so that the centering and the like can be performed smoothly. The reduced diameter portion 14 and the annular groove 24 are made to coincide with each other in a state in which the protruding portion 13 enters and fits into the hollow portion 28.

  The male joint anchor portion 12 and the female joint anchor body 32 are made of deformed steel bars, and the resistance to pulling is ensured by increasing the adhesion force to the concrete through the sash. Not limited to this, it is possible to secure the pulling resistance force by providing a huge portion at the rear end of the round bar member.

(4) Annular spring As shown in FIG. 2 (c), the annular spring 25 is formed by connecting the ends of a coil spring, for example, in a ring shape, and incorporating a core member 26 in the coil cross section if necessary. Is done. In the illustrated example, the annular spring 25 is a core made of carbon steel having a cross-sectional shape formed into an oval shape using a coil spring of a stainless steel wire for a spring, and a cross-sectional shape being an oval shape inside and a planar shape being a sector shape. Four 26 are arranged.

  Such an annular spring 25 can be elastically expanded and contracted in the radial direction, and in the contracted state, the inner diameter is smaller than the outer diameter of the projecting portion 13 of the male joint and is substantially equal to the outer diameter of the reduced diameter portion 14. It is larger than the hole diameter of the hollow portion 28 and smaller than the hole diameter of the annular groove 24 of the female joint. The width of the annular spring 25 is slightly smaller than the groove width of the reduced diameter portion 14 and the annular groove 24.

  Therefore, when the protruding portion 13 of the male joint enters while pushing the annular spring 25 widened, the annular spring 25 expands the outer diameter in the annular groove 24, and when further entered, the annular portion 25 is annularly connected to the reduced diameter portion 14. The spring 25 is fitted by the reduced diameter, and the annular spring 25 straddles the annular groove 24 and the reduced diameter portion 14 to resist the pulling force acting on the joint portion.

  The core member 26 is a member that prevents the annular spring 25 from being greatly deformed and displaced or removed from the annular groove 24 of the female joint when a pulling force is applied to the joint portion. The core material 26 can be divided into several parts along the circumference of the annular spring 25 so that the expansion and contraction associated with the expansion and contraction of the annular spring 25 is not restricted.

  The cross-sectional shapes of the annular spring 25 and the core member 26 are not limited to the oval shape shown in the drawings, but may be a circle, an ellipse, a rectangle, or the like. Various materials can also be used.

  Here, when the male joint pushes the annular spring 25 in the radial direction, the annular spring 25 may be detached from the annular groove 24. In this case, as shown in FIG. 3, an enlarged diameter holding tool 50 for holding the annular spring 25 in an expanded state in advance is used. In the illustrated example, the diameter expanding holder 50 is a type in which a cylindrical one is disposed through the hole in the annular spring 25, and is pushed out to the bottom of the hollow portion 28 by the tip of the protruding portion 13 of the male joint. It is released from the enlarged diameter holder 50 and enters the reduced diameter portion 14 of the male joint.

  In the joint as described above, as shown in FIG. 4, the male joint 11 and the female joint 21 are respectively embedded in the joint portion of the precast members 1 and 1 such as a pair of tunnel lining segment members to be joined, By pressing the precast member 1 on the male joint side with a jack or the like, the protruding portion 13 of the male joint 11 enters the hollow portion 28 of the female joint 21, and the diameter-enlarged holder 50 is placed at the bottom of the hollow portion 28. Extruding and the annular spring 25 enters the reduced diameter portion 14 of the protruding portion 13. In a state where the pair of precast members and the joint surfaces of the members 1 and 1 are in contact with each other, the annular spring 25 straddles the annular groove 24 and the reduced diameter portion 14 and resists a pulling force acting on the joint portion.

  Needless to say, the present invention is not limited to the illustrated examples. Further, the present invention is effectively applied to a relatively small precast member such as a tunnel lining segment, a lining plate, a paving plate, or a storage wall.

FIG. 1 is a partial cross-sectional view showing an example of a female joint of the present invention, where (a) is a case of welding joint and (b) is a case of screw joint. It is an example of each part of the female joint of the present invention, (a) is an exploded sectional view of the female joint, (b) is a sectional view of the head of the female joint, (c) is a sectional view and a plan view of the annular spring, It is the top view and end view of a core material. It is a perspective view which shows the example of fitting operation | movement of the female joint and male joint of this invention. It is sectional drawing which shows in order the joining operation | movement of the precast member by the female joint and male joint of this invention. It is an example of the conventional coupling | joint, (a) is a perspective view, (b) is sectional drawing which shows the female joint and the cutter for groove processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Precast member 11 ... Male joint 12 ... Anchor part 13 ... Protrusion part 14 ... Reduced diameter part 21 ... Female joint 22 ... Anchor part 23 ... Head part 24 ... Ring groove 24a ... Bottom groove 24b ... Side wall surface 25 ... Ring spring 26 ... Core 27 ... Expanded diameter holder 28 ... Hollow part 28a ... Hollow part hole (inlet part)
28b ... Hollow hole (inner part)
DESCRIPTION OF SYMBOLS 31 ... Head body 32 ... Anchor body 33 ... Expansion hole 34 ... Screw hole 35 for mold fixing ... Reduced diameter shaft part 35a ... Step part 36 ... Counterbore 40 ... Fillet weld 50 ... Diameter expansion holder

Claims (5)

A male joint provided at a joint position of one precast member to be joined is fitted to a female joint provided on the other precast member and joined, and the male joint is connected to the one precast member. A rod-shaped projecting portion projecting from the joint surface of the member, and a reduced diameter portion is formed on the outer peripheral surface of the projecting portion; the female joint opens to the joint surface of the other precast member; The protruding portion of the joint has a cylindrical head portion that is fitted into an inner hollow portion, and the inner surface of the head corresponds to the reduced diameter portion in a state where the protruding portion of the male joint is fitted. An annular groove is formed at a position where the annular groove has an inner diameter in a contracted state smaller than the outer diameter of the protruding portion of the male joint, and an annular elastic member that can be elastically expanded and contracted in the radial direction is attached to the annular groove. In the joint of the precast member
The female joint is divided into a cylindrical head body provided with the annular groove and a rod-like anchor body connected to the head body. The head body is hollow on the joint surface side with the annular groove interposed therebetween. An enlarged hole is formed on the opposite side, the hole diameter being larger than the hole diameter of the hollow hole and smaller than the hole diameter of the annular groove, and a hollow hole is formed at the end of the anchor body on the head body side. The hollow portion and the annular groove are formed by the head body and the anchor body by inserting the end of the anchor body side into the enlarged hole of the head body and integrating the head body and the anchor body. A joint of precast members characterized by the above. The joint of the precast member according to claim 1, wherein a reduced diameter shaft portion having a length corresponding to the length of the enlarged hole is formed on the outer peripheral surface of the end portion on the head body side of the anchor body, A joint for a precast member, wherein a reduced diameter shaft portion is inserted, and a side wall surface on one side of the annular groove is constituted by an end surface on the head body side of the reduced diameter shaft portion.   The joint of the precast member according to claim 1 or 2, wherein the anchor body of the female joint is a deformed steel bar.   The precast member joint according to any one of claims 1 to 3, wherein the male joint is provided with a rod-like protrusion at the tip of an anchor portion made of a deformed steel bar. Joints for members.   A precast member in which a plurality of female joints according to any one of claims 1 to 3 are installed on a joint surface.

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