Joint structures, pipes, and protective members

Abstract

The present invention provides a joint structure that can prevent or suppress the insertion support portion from coming out of the groove when the insertion port is inserted, and that can suppress the sealing member from coming out of the receiving port when a water pressure load occurs. [Solution] The joint structure 1 comprises an insertion opening 20 of the joining pipe W20, a receiving opening 10 of the pipe to be joined W10, a sealing member 30, and a protective member 50. The sealing member 30 has a sealing body portion 31 and an insertion support portion 32. The sealing body portion 31 has a contact portion 311. The protective member 50 has a holding portion 51 that engages with and is held by the flange 13, an end face covering portion 52 that covers the opening end face 14 of the receiving opening 10, and a cover portion 53 that extends in one axial direction between the outer circumferential surface 22 of the insertion opening 20 of the joining pipe W20 and the inner circumferential surface 11 of the receiving opening 10 of the pipe to be joined W10, and overlaps with at least a part of the insertion support portion 32 when viewed radially.

Description

Technical Field

[0001] The present invention relates to a joint structure including an insertion port of a pipe and a receiving port of a joined pipe joined to the pipe, a pipe including a protective member, and a protective member.

Background Art

[0002] There is known a sealing member that is used in a joint structure including an insertion port of a pipe and a receiving port of a joined pipe joined to the pipe, and seals between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port. As such a sealing member, for example, Patent Document 1 discloses a rubber ring including a heel portion that fits and engages in a locking groove formed on the peripheral surface of a rubber ring arrangement recess of the receiving port, and a valve portion that is compressed between the peripheral surface of the rubber ring arrangement recess and the outer peripheral surface of the insertion port to generate a sealing surface pressure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, the joining of pipes has been performed manually by workers entering the excavation trench. Therefore, from the viewpoints of cost reduction, shortening of the construction period, and suppression of variations in construction quality, it has been demanded to automate the pipe joining operation by a working machine. In automating the pipe joining operation with a working machine, a larger opening dimension of the receiving port is more workable because the insertion port can be inserted into the receiving port without precise alignment. On the other hand, the larger the opening dimension of the receiving port, the larger the gap between the opening-side end portion of the receiving port and the outer peripheral surface of the insertion port.

[0005] In a joint structure with a large gap between the opening end of the socket and the outer surface of the insertion end, the dimension of the groove on the opening side of the socket in the inner surface of the socket becomes smaller, making it easier for the insertion support part to come out of the groove when the insertion end is inserted. As a result, when a hydraulic load is generated, the sealing member may come out of the socket.

[0006] The object of the present invention is to provide a joint structure and protective member that can prevent or suppress the insertion support portion from coming out of the groove when the insertion port is inserted, and that can suppress the sealing member from coming out of the receiving port when a water pressure load occurs. [Means for solving the problem]

[0007] A joint structure according to one embodiment of the present invention comprises a pipe slit, a receiving end of a pipe to be joined to the pipe by insertion of the pipe slit from its opening, a sealing member made of an elastic material that seals the space between the outer circumferential surface of the pipe slit and the inner circumferential surface of the receiving end of the pipe to be joined, and a protective member that protects the sealing member. The receiving end has a flange located on the outer circumferential surface of the opening end of the receiving end, and a groove extending in the circumferential direction on its inner circumferential surface. The sealing member has an annular sealing body portion compressed radially by the outer circumferential surface of the slit and the inner circumferential surface of the receiving end, and an insertion support portion connected at the receiving end of the sealing body portion on the receiving end opening side and inserted into the groove of the receiving end. The sealing body portion has a contact portion located at the receiving end of the sealing body portion on the receiving end opening side. The protective member has a retaining portion that engages with and is held by the flange, an end-face covering portion connected to the retaining portion and covering the open end face of the receiving port, and a cover portion connected to the end-face covering portion and extending in one axial direction between the outer circumferential surface of the insertion port of the pipe and the inner circumferential surface of the receiving port of the pipe to be joined, to a position that overlaps with at least a part of the insertion support portion when viewed radially (first configuration).

[0008] In the above configuration, the cover portion extends axially between the outer circumferential surface of the insertion opening of the pipe and the inner circumferential surface of the receiving opening of the pipe to be joined, to a position where it overlaps with at least a part of the insertion support portion when viewed in the radial direction.

[0009] According to the above configuration, it is possible to prevent or suppress the insertion support portion from coming out of the groove when the insertion port is inserted. Furthermore, if the sealing member deforms toward the opening side of the receiving port due to a hydraulic load occurring toward the opening side of the receiving port, the contact portion will come into contact with the cover portion connected to the radially inner end of the holding portion. This prevents the sealing member from moving toward the opening side of the receiving port beyond the cover portion.

[0010] Therefore, it is possible to prevent or suppress the insertion support part from coming out of the groove when the insertion port is inserted, and it is also possible to suppress the sealing member from coming out of the receiving port when a water pressure load occurs.

[0011] In the first configuration, the inner diameter of the socket in the portion located in the axial direction relative to the groove is smaller than the inner diameter of the portion located in the axial direction relative to the groove (second configuration).

[0012] According to the above configuration, the insertion end of the pipe can be easily inserted into the receiving end of the pipe to be joined. This makes the joining process more efficient.

[0013] A pipe according to one embodiment of the present invention has a socket, and a connecting pipe having a slit is joined to the connecting pipe by being inserted into the socket. The pipe comprises a sealing member made of an elastic material that seals the space between the outer circumferential surface of the slit of the connecting pipe and the inner circumferential surface of the socket, and a protective member that protects the sealing member. The socket has a flange located on the outer circumferential surface of the opening end of the socket, and a groove extending in the circumferential direction on its inner circumferential surface. The sealing member has an annular sealing body portion that is compressed radially by the outer circumferential surface of the slit and the inner circumferential surface of the socket when the slit of the connecting pipe is joined to the socket of the pipe, and an insertion support portion that is connected radially outward at the end of the sealing body portion on the opening side of the socket and is located within the groove of the socket. The sealing body portion has a contact portion located at the end of the sealing body portion on the opening side of the socket. The protective member has a retaining portion that engages with and is held by the flange, an end-face covering portion connected to the retaining portion and covering the open end face of the socket, and a cover portion connected to the end-face covering portion and overlapping at least a part of the seal body portion when viewed in the axial direction of the pipe. The cover portion is configured to bend between the outer circumferential surface of the insertion portion of the connecting pipe and the inner circumferential surface of the socket of the pipe when the insertion portion of the connecting pipe is inserted into the socket of the pipe (third configuration).

[0014] In the above configuration, the cover portion overlaps at least a part of the seal body portion when viewed in the axial direction of the pipe. Therefore, it is possible to prevent or suppress the adhesion of foreign matter to the seal member between the time the connecting pipe is lowered into the groove in which the pipe is placed and the time it is joined to the pipe.

[0015] Furthermore, in the above configuration, when the insertion end of the connecting pipe is inserted into the receiving end of the pipe, the cover portion bends between the outer surface of the insertion end of the connecting pipe and the inner surface of the receiving end of the pipe. Therefore, when the insertion end of the connecting pipe is joined to the receiving end of the pipe, the cover portion is positioned between the outer surface of the insertion end of the connecting pipe and the inner surface of the receiving end of the pipe.

[0016] Therefore, with the above configuration, if the sealing member deforms toward the opening side of the receiving port due to a hydraulic load occurring toward the opening side of the receiving port, the contact portion will come into contact with the cover portion. This prevents the sealing member from moving toward the opening side of the receiving port beyond the cover portion. Thus, when a hydraulic load occurs, it is possible to prevent the sealing member from coming out of the receiving port.

[0017] In the third configuration, the cover portion has an inclined surface whose inner diameter decreases towards one side in the axial direction (fourth configuration).

[0018] According to the above configuration, when the insertion end of the connecting pipe is inserted into the receiving end of the pipe, the inclined surface of the cover portion can guide the connecting pipe radially inward. This makes the joining process more efficient.

[0019] In the third or fourth configuration, the cover portion extends in a bent state as the insertion opening of the connecting pipe is inserted into the receiving opening of the pipe, and in the radial direction, it overlaps with at least a part of the insertion support portion (fifth configuration).

[0020] This makes it more preferable to prevent the sealing member from moving towards the opening of the socket beyond the cover portion. Therefore, when a hydraulic load occurs, it is more preferable to prevent the sealing member from coming out of the socket.

[0021] A protective member according to an embodiment of the present invention is attached to an opening-side end portion of a receiving port of a joined pipe to which a joining pipe having an insertion port is inserted and joined in the receiving port, and protects an annular seal member attached to an inner peripheral surface of the joined pipe. The protective member includes a holding portion that is engaged and held by a flange located on an outer peripheral surface of the opening-side end portion of the receiving port, an end surface covering portion that is connected to the holding portion and covers an opening end surface of the receiving port, and a cover portion that is connected to the end surface covering portion. The cover portion is configured to cover a part of the opening of the receiving port in a state where the holding portion is held by the flange of the joined pipe, and to bend between an outer peripheral surface of the insertion port of the joining pipe and an inner peripheral surface of the receiving port of the joined pipe when the insertion port of the joining pipe is inserted into the receiving port of the joined pipe (sixth configuration).

[0022] In the above configuration, the cover portion covers a part of the opening of the receiving port in a state where the holding portion is held by the flange of the joined pipe. Therefore, it is possible to prevent or suppress foreign matter from adhering to the seal member between the time when the joining pipe is lowered into the groove in which the joined pipe is disposed and the time when it is joined to the joined pipe.

[0023] Further, the cover portion bends between an outer peripheral surface of the insertion port of the joining pipe and an inner peripheral surface of the receiving port of the joined pipe when the insertion port of the joining pipe is inserted into the receiving port of the joined pipe.

[0024] Therefore, when a hydraulic pressure load occurs after joining of the joining pipe and the joined pipe, it is possible to prevent an annular seal member disposed between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port from coming out of the receiving port.

Advantages of the Invention

[0025] A joint structure according to one embodiment of the present invention comprises a pipe slit, a receiving end of a pipe to be joined to the pipe by insertion of the pipe slit from its opening, a sealing member made of an elastic material that seals the space between the outer circumferential surface of the pipe slit and the inner circumferential surface of the receiving end of the pipe to be joined, and a protective member that protects the sealing member. The receiving end has a flange located on the outer circumferential surface of the opening end of the receiving end, and a groove extending in the circumferential direction on its inner circumferential surface. The sealing member has an annular sealing body portion compressed radially by the outer circumferential surface of the slit and the inner circumferential surface of the receiving end, and an insertion support portion connected at the receiving end of the sealing body portion on the receiving end opening side and inserted into the groove of the receiving end. The sealing body portion has a contact portion located at the receiving end of the sealing body portion on the receiving end opening side. The protective member has a retaining portion that engages with and is held by the flange, an end-face covering portion connected to the retaining portion and covering the open end face of the receiving port, and a cover portion connected to the end-face covering portion and extending in one axial direction between the outer circumferential surface of the insertion port of the pipe and the inner circumferential surface of the receiving port of the pipe to be joined, to a position that overlaps with at least a part of the insertion support portion when viewed radially.

[0026] The pipe according to an embodiment of the present invention includes a sealing member composed of an elastic member that seals between the outer peripheral surface of the insertion port of the joining pipe and the inner peripheral surface of the receiving port, and a protection member that protects the sealing member. The receiving port has a flange located on the outer peripheral surface of the opening-side end of the receiving port and a groove extending in the circumferential direction on the inner peripheral surface. When the insertion port of the joining pipe is joined to the receiving port of the pipe, the sealing member has an annular sealing main body portion that is radially compressed by the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port, and an insertion support portion that is connected radially outward at the end portion of the sealing main body portion on the receiving port opening side and is located in the groove of the receiving port. The sealing main body portion has a contact portion located at the end portion of the sealing main body portion on the receiving port opening side. The protection member has a holding portion that is engaged with and held by the flange, an end face covering portion that is connected to the holding portion and covers the opening end face of the receiving port, and a cover portion that is connected to the end face covering portion and overlaps at least a part of the sealing main body portion when viewed in the axial direction of the pipe. The cover portion is configured to bend between the outer peripheral surface of the insertion port of the joining pipe and the inner peripheral surface of the receiving port of the pipe when the insertion port of the joining pipe is inserted into the receiving port of the pipe.

[0027] The protection member according to an embodiment of the present invention has a holding portion that is engaged with and held by a flange located on the outer peripheral surface of the opening-side end of the receiving port of the pipe to be joined, an end face covering portion that is connected to the holding portion and covers the opening end face of the receiving port, and a cover portion that is connected to the end face covering portion. The cover portion covers a part of the opening of the receiving port in a state where the holding portion is held by the flange, and is configured to bend between the outer peripheral surface of the insertion port of the joining pipe and the inner peripheral surface of the receiving port of the pipe to be joined when the insertion port of the joining pipe is inserted into the receiving port of the pipe to be joined.

[0028] Thereby, it is possible to prevent or suppress the insertion support portion from coming out of the groove when the insertion port is inserted, and it is possible to suppress the sealing member from coming out of the receiving port when a water pressure load occurs.

Brief Description of the Drawings

[0029] [Figure 1] Figure 1 is a cross-sectional view showing a schematic configuration of a joint structure according to an embodiment of the present invention. [Figure 2] Figure 2 is a schematic cross-sectional view showing the state before the insertion port 20 is inserted into the receiving port 10. [Figure 3] Figure 3 is a partial cross-sectional perspective view showing the schematic configuration of the protective member before the pipe to be joined is joined to the connecting pipe. [Figure 4] Figure 4 shows the state in which the cover portion bends when the insertion end of the connecting pipe is inserted into the receiving end of the pipe to be connected. [Modes for carrying out the invention]

[0030] The following describes each embodiment with reference to the drawings. In each drawing, the same parts are denoted by the same reference numerals, and the description of those parts will not be repeated. Note that the dimensions of the components in each drawing do not faithfully represent the dimensions of the actual components or the dimensional ratios of each component.

[0031] Furthermore, in the following explanation, the terms “support,” “connection,” and “holding” (hereinafter referred to as “support, etc.”) include not only cases where members are directly supported, etc., by each other, but also cases where they are supported, etc., through other members. In other words, in the following explanation, the terms “support, etc.” include both direct and indirect support, etc., between members.

[0032] (Joint structure) Figure 1 is a schematic cross-sectional view showing the general configuration of a joint structure 1 according to an embodiment of the present invention. Figure 2 is a schematic cross-sectional view showing the state before the insertion of the socket 20 into the socket 10. Note that the joint structure 1 shown in Figures 1 and 2 is symmetrical with respect to the central axis P.

[0033] Referring to Figures 1 to 4, the joint structure 1 comprises an insertion port 20 of the connecting pipe W20, a receiving port 10 of the pipe to be connected W10, a sealing member 30, a protective member 50, and a locking ring 91.

[0034] The pipe to be joined W10 and the joining pipe W20 are, for example, water pipes. The pipe to be joined W10 and the joining pipe W20 may be pipes other than water pipes, such as sewer pipes, agricultural water pipes, or gas pipes. The pipe to be joined W10 and the joining pipe W20 may be ductile cast iron pipes, other metal pipes, or resin pipes. In the joint structure 1, the central axis of the joining pipe W20 and the central axis P of the pipe to be joined W10 coincide.

[0035] (Socket) The socket 10 is joined to the connecting pipe W20 by the insertion port 20 of the connecting pipe W20 being inserted through the opening 101. The socket 10 has a flange 13 located on the outer circumferential surface 12 of the opening end of the socket 10. The socket 10 has a lock ring groove 111, an insertion support groove (groove) 112, and a seal body groove 113 on its inner circumferential surface 11. The insertion support groove 112 is located on the socket opening side of the seal body groove 113. Also, the seal body groove 113 is located on the socket opening side of the lock ring groove 111.

[0036] The locking ring groove 111 is an annular groove extending around the entire circumference on the inner circumferential surface 11 of the socket 10. A locking ring 91 is positioned within the locking ring groove 111. The locking ring 91 positioned within the locking ring groove 111 restricts the axial movement of the connecting pipe W20 so that the insertion end 20 of the connecting pipe W20, which is inserted into the socket 10 of the pipe to be connected W10, does not come out of the socket 10. The configuration of the locking ring groove 111 and the locking ring 91 can employ known technologies, so their description is omitted.

[0037] The insertion support groove 112 is an annular groove extending around the entire circumference on the inner circumferential surface 11 of the receiving opening 10. The insertion support portion 32 of the sealing member 30 is positioned within the insertion support groove 112.

[0038] Of the socket 10, the inner diameter D1 of the portion 121 located in the axial direction relative to the insertion support groove 112 is smaller than the inner diameter D2 of the portion 122 located in the axial direction relative to the insertion support groove 112.

[0039] The groove 113 for the seal body is an annular groove extending around the entire circumference on the inner circumferential surface 11 of the receiving opening 10. A portion of the seal body 31 of the seal member 30 is located within the groove 113 for the seal body.

[0040] (Insertion port) The insertion port 20 has an insertion port projection 24 at its end on the side of the opening 201. The insertion port projection 24 protrudes radially outward from the outer circumferential surface 22 of the insertion port 20. When the pipe to be joined W10 and the joining pipe W20 are joined, the insertion port projection 24 of the joining pipe W20 is positioned on one axial side with respect to the lock ring 91 attached to the inner circumferential surface 11 of the receiving port 10 of the pipe to be joined W10. The insertion port projection 24 comes into contact with the lock ring 91 when the joining pipe W20 moves axially toward the opening side of the pipe to be joined W10. This prevents the insertion port 20 from coming out of the receiving port 10.

[0041] (Sealing material) The sealing member 30 is positioned between the inner circumferential surface 11 of the receiving end 10 and the outer circumferential surface 22 of the insertion end 20. The sealing member 30 is an annular member whose central axis coincides with or is parallel to the central axis P of the pipe to be joined W10. The sealing member 30 is made of an elastic material. The sealing member 30 seals the space between the outer circumferential surface 22 of the insertion end 20 of the joining pipe W20 and the inner circumferential surface 11 of the receiving end 10 of the pipe to be joined W10.

[0042] The sealing member 30 has a sealing body portion 31 and an insertion support portion 32.

[0043] The seal body portion 31 is compressed radially by the outer circumferential surface 22 of the insertion port 20 and the inner circumferential surface 11 of the receiving port 10. The seal body portion 31 is annular in shape. The seal body portion 31 extends axially from the position of the insertion support groove 112 to the position of the seal body groove 113 between the outer circumferential surface 22 of the insertion port 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving port 10 of the pipe to be connected W10. A portion of the seal body portion 31 is located within the seal body groove 113.

[0044] The seal body portion 31 has a contact portion 311 located at the end of the seal body portion 31 on the receiving port opening side.

[0045] The insertion support portion 32 is connected to the end of the seal body portion 31 on the receiving opening side and is inserted into the insertion support portion groove 112 of the receiving opening 10.

[0046] In the sealing member 30, an inside corner is formed by the contact portion 311 of the sealing body portion 31 and the inner circumferential surface of the insertion support portion 32.

[0047] (Protective material) The protective member 50 protects the sealing member 30. The protective member 50 is made of, for example, an annular resin member. Figure 3 is a partial cross-sectional perspective view showing the schematic configuration of the protective member 50 before the pipe to be joined W10 is joined to the joining pipe W20. The protective member 50 has a holding portion 51, an end face covering portion 52, and a cover portion 53.

[0048] The retaining portion 51 is held in place by engaging with the flange 13. The retaining portion 51 is U-shaped and bends to cover the flange 13.

[0049] The end face covering portion 52 is connected to the other axial side of the holding portion 51 and extends radially inward to cover the open end face 14 of the receiving opening 10.

[0050] The cover portion 53 is connected to the end face covering portion 52 at its radially inner end. More specifically, the base end of the cover portion 53 is connected to the end face covering portion 52. The cover portion 53 is located between the outer circumferential surface 22 of the insertion opening 20 of the joining pipe W20 and the inner circumferential surface 11 of the receiving opening 10 of the pipe to be joined W10. The cover portion 53 is configured in an annular shape.

[0051] As shown in Figure 3, before the pipe to be joined W10 is joined to the joining pipe W20, the inner circumferential surface of the cover portion 53 is a tapered inclined surface in which the inner diameter decreases towards one side in the axial direction.

[0052] Referring to Figures 1 and 2 in addition to Figure 3, the cover portion 53 overlaps at least a part of the seal body portion 31 when viewed in the axial direction of the pipe to be joined W10. The cover portion 53 is configured to bend between the outer circumferential surface 22 of the insertion port 20 of the joining pipe W20 and the inner circumferential surface 11 of the receiving port 10 of the pipe to be joined when the insertion port 20 of the joining pipe W20 is inserted into the receiving port 10 of the pipe to be joined W10. The cover portion 53 may have reinforcing lines or notches arranged at predetermined intervals in the circumferential direction. The reinforcing lines may be cuts or grooves. This allows the cover portion 53 to bend easily in the axial direction. The cover portion 53 does not necessarily have to have reinforcing lines or notches.

[0053] Furthermore, the cover portion 53 is bent relative to the end face covering portion 52 when the insertion opening 20 of the connecting pipe W20 is inserted into the receiving opening 10 of the pipe to be connected W10. Also, the tip portion of the cover portion 53 extends to a position where it overlaps with at least a part of the insertion support portion 32 when viewed radially. Note that the tip portion of the cover portion 53 may be in contact with the contact portion 311 of the seal body portion 31, or it may be separated from the contact portion 311 in the other axial direction.

[0054] In the above configuration, the cover portion 53 extends axially between the outer circumferential surface 22 of the insertion opening 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving opening 10 of the pipe to be connected, to a position where it overlaps with at least a part of the insertion support portion 32 when viewed radially.

[0055] Therefore, with the above configuration, it is possible to prevent or suppress the insertion support portion 32 from coming out of the insertion support portion groove 112 when the insertion port 20 is inserted.

[0056] Furthermore, if the sealing member 30 deforms toward the opening side of the receiving port 10 due to a hydraulic load being generated in a direction toward the opening side of the receiving port 10, the contact portion 311 of the sealing body portion 31 will come into contact with the tip portion of the cover portion 53, which is connected to the radially inner end of the end face covering portion 52. This prevents the sealing member 30 from moving toward the opening side of the receiving port 10 beyond the cover portion 53.

[0057] Therefore, it is possible to prevent the insertion support part 32 from coming out of the groove 112 for the insertion support part when the insertion port 20 is inserted, and to prevent the sealing member 30 from coming out of the receiving port 10 when a water pressure load occurs.

[0058] (Method of joining the socket and the receiving end) Next, with reference to Figures 1, 2, and 4, a joining method for joining the insertion port 20 and the receiving port 10 to which the protective member 50 is attached will be described. Figure 4 shows the state in which the cover portion 53 bends when the insertion port 20 of the joining pipe W20 is inserted into the receiving port 10 of the pipe to be joined W10.

[0059] Referring to Figure 2, first, a lubricant 33 is applied to the sealing member 30 placed on the inner circumferential surface 11 of the receiving opening 10, and the protective member 50 is placed on the opening end of the receiving opening 10.

[0060] The lubricant 33 is applied to the receiving side of the seal body portion 31 of the sealing member 30. The inner circumferential surface of the cover portion 53 is a tapered inclined surface in which the inner diameter decreases towards one side in the axial direction. The cover portion 53 covers the outer circumferential end of the opening 101 of the receiving end 10. Therefore, when viewed in the axial direction of the pipe W10 to be joined, the cover portion 53 overlaps with at least a part of the seal body portion 31.

[0061] Therefore, it is possible to prevent or suppress the adhesion of foreign matter to the sealing member 30 between the time the connecting pipe W20 is lowered into the groove where the pipe to be connected W10 is located using a work machine or the like, and the time it is joined to the pipe to be connected W10.

[0062] Next, the central axes P of the connecting pipe W20 and the pipe to be connected W10 are aligned relative to each other, and the connecting pipe W20 is moved in one axial direction relative to the pipe to be connected W10.

[0063] Next, referring to Figure 4, when the insertion port 20 is inserted into the receiving port 10 through the opening 101 of the receiving port 10, the opening end of the insertion port 20 contacts the inclined surface of the cover portion 53. As a result, the insertion port 20 is guided radially inward by the inclined surface of the cover portion 53. Alternatively, the insertion port 20 may be inserted into the receiving port 10 while the end face covering portion 52 of the protective member 50 is pressed against the opening end face 14 of the receiving port 10 using a holding jig.

[0064] Thus, when the insertion port 20 of the connecting pipe W20 is inserted into the receiving port 10 of the pipe to be joined W10, the inclined surface of the cover portion 53 guides the connecting pipe W20 radially inward into the pipe to be joined W10. Therefore, when aligning the connecting pipe W20 and the pipe to be joined W10 using a work machine or the like, a slight misalignment can be tolerated. This makes the alignment of the connecting pipe W20 and the pipe to be joined W10 during the joining work more efficient.

[0065] When the insertion port 20 is further inserted in one axial direction, the cover portion 53 of the protective member 50 deforms and bends between the insertion port projection 24 of the insertion port 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving port 10 of the pipe to be connected W10. Consequently, the tip portion of the cover portion 53 moves radially outward. As a result, the tip portion of the cover portion 53 is positioned so as to overlap with at least a part of the insertion support portion 32 when viewed radially.

[0066] When the insertion port 20 is inserted further axially than the seal body portion 31 of the seal member 30, the seal member 30 will attempt to move in one axial direction as the insertion port 20 moves. When the seal body portion 31 attempts to move in one axial direction, a force acts radially inward from the seal body portion 31 to the insertion support portion 32.

[0067] In contrast, in the above configuration, the tip of the cover portion 53 is positioned to overlap with at least a part of the insertion support portion 32 when viewed radially, thus preventing the insertion support portion 32 from moving radially inward.

[0068] Therefore, with the above configuration, when the insertion opening 20 is further inserted in one axial direction, the insertion support portion 32 can be prevented from coming out of the groove.

[0069] Furthermore, by positioning the tip of the cover portion 53 so as to overlap with at least a part of the insertion support portion 32 when viewed radially, it is more preferable to suppress the sealing member 30 from moving towards the opening 101 of the receiving port 10 relative to the cover portion 53. Therefore, when a hydraulic load occurs, it is more preferable to suppress the sealing member 30 from coming out of the receiving port 10.

[0070] Furthermore, with the cover portion 53 of the protective member 50 bent as described above, the receiving end portion of the seal body 31, to which the lubricant has been applied, is exposed in the axial direction. As a result, when the insertion opening 20 moves to one side in the axial direction, the receiving end portion of the seal body 31, to which the lubricant has been applied, comes into contact with it. This allows the insertion opening 20 to be smoothly inserted into the receiving end 10.

[0071] The seal body 31 is compressed by the outer circumferential surface 22 of the insertion port 20 and the inner circumferential surface 11 of the receiving port 10, and the insertion port 20 is further inserted in one axial direction until the insertion port projection 24 passes over the lock ring 91, thereby completing the joining of the insertion port 20 and the receiving port 10. This seals the space between the inner circumferential surface 11 of the receiving port 10 and the outer circumferential surface 22 of the insertion port 20. As a result, a joint structure 1 as shown in Figure 1 is obtained.

[0072] As described above, the pipe to be joined with the protective member W10 is a pipe that has a receiving opening 10 and is joined to the joining pipe W20 by inserting the joining pipe W20, which has a spigot opening 20, into the receiving opening 10. The pipe to be joined with the protective member W10 includes a sealing member 30 made of an elastic material that seals the space between the outer circumferential surface 22 of the spigot opening 20 of the joining pipe W20 and the inner circumferential surface 11 of the receiving opening 10, and a protective member 50 that protects the sealing member 30. The receiving opening 10 has a flange 13 located on the outer circumferential surface of the opening end of the receiving opening 10, and an insertion support groove 112 extending in the circumferential direction on the inner circumferential surface 11. The sealing member 30 has an annular sealing body portion 31 that is compressed radially by the outer circumferential surface 22 of the insertion port 20 and the inner circumferential surface 11 of the receiving port 10 when the insertion port 20 of the joining pipe W20 is joined to the receiving port 10 of the pipe to be joined W10, and an insertion support portion 32 that is connected radially outward at the end of the sealing body portion 31 on the opening 101 side of the receiving port 10 and is located within the insertion support groove 112 of the receiving port 10. The sealing body portion 31 has a contact portion 311 located at the end of the sealing body portion 31 on the receiving port opening side. The protective member 50 has a holding portion 51 that engages with and is held by the flange 13, an end face covering portion 52 that is connected to the holding portion 51 and covers the opening end face 14 of the receiving port 10, and a cover portion 53 that is connected to the end face covering portion 52 and overlaps with at least a part of the sealing body portion 31 when viewed in the axial direction of the pipe to be joined W10. The cover portion 53 is configured to bend between the outer circumferential surface 22 of the insertion opening 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving opening 10 of the pipe to be connected when the insertion opening 20 of the connecting pipe W20 is inserted into the receiving opening 10 of the pipe to be connected W10.

[0073] In the above configuration, the cover portion 53 overlaps with at least a part of the seal body portion 31 when viewed in the axial direction of the pipe to be joined W10. Therefore, it is possible to prevent or suppress foreign matter from adhering to the seal member 30 between the time the joining pipe W20 is lowered into the groove where the pipe to be joined W10 is located and the time it is joined to the pipe to be joined W10.

[0074] Furthermore, in the above configuration, when the insertion port 20 of the connecting pipe W20 is inserted into the receiving port 10 of the pipe to be connected W10, the cover portion 53 bends between the outer circumferential surface 22 of the insertion port 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving port 10 of the pipe to be connected W10. Therefore, when the insertion port 20 of the connecting pipe W20 is connected to the receiving port 10 of the pipe to be connected W10, the cover portion 53 is positioned between the outer circumferential surface 22 of the insertion port 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving port 10 of the pipe to be connected W10.

[0075] Therefore, with the above configuration, if the sealing member 30 deforms toward the opening side of the receiving port 10 due to a hydraulic load being generated toward the opening side of the receiving port 10, the contact portion 311 will come into contact with the cover portion 53. This prevents the sealing member 30 from moving toward the opening side of the receiving port 10 beyond the cover portion 53. Thus, when a hydraulic load is generated, it is possible to prevent the sealing member 30 from coming out of the receiving port 10.

[0076] Furthermore, as described above, the protective member 50 is attached to the open end of the receiving end 10 of the pipe to be joined, which is into which the connecting pipe W20 having the insertion opening 20 is inserted and joined, and protects the annular sealing member 30 attached to the inner circumferential surface 11 of the pipe to be joined W10. The protective member 50 has a holding portion 51 that engages with and is held by a flange 13 located on the outer circumferential surface 12 of the open end of the receiving end 10, an end face covering portion 52 connected to the holding portion 51 and covering the open end face of the receiving end 10, and a cover portion 53 connected to the end face covering portion 52. The cover portion 53 is configured to cover a part of the opening 101 of the receiving end 10 while the holding portion 51 is held by the flange 13 of the pipe to be joined W10, so that when the insertion end 20 of the joining pipe W20 is inserted into the receiving end 10 of the pipe to be joined W10, it bends between the outer circumferential surface 22 of the insertion end 20 of the joining pipe W20 and the inner circumferential surface 11 of the receiving end 10 of the pipe to be joined W10.

[0077] In the above configuration, the cover portion 53 covers a part of the opening 101 of the receiving end 10 while the holding portion 51 is held by the flange 13 of the pipe to be joined W10. Therefore, it is possible to prevent or suppress foreign matter from adhering to the sealing member 30 between the time the joining pipe W20 is lowered into the groove where the pipe to be joined W10 is located and the time it is joined to the pipe to be joined W10.

[0078] Furthermore, when the insertion opening 20 of the connecting pipe W20 is inserted into the receiving opening 10 of the pipe to be connected, the cover portion 53 bends between the outer surface 22 of the insertion opening 20 of the connecting pipe W20 and the inner surface 11 of the receiving opening 10 of the pipe to be connected.

[0079] Therefore, when a hydraulic load occurs after joining the connecting pipe W20 and the pipe to be joined W10, the annular sealing member 30, which is positioned between the outer circumferential surface 22 of the insertion opening 20 and the inner circumferential surface 11 of the receiving opening 10, can be prevented from coming out of the receiving opening 10.

[0080] As described above, the inner diameter D1 of the portion 121 of the socket 10 located on one side in the axial direction relative to the insertion support groove 112 is smaller than the inner diameter D2 of the portion 122 located on the other side in the axial direction relative to the insertion support groove 112.

[0081] According to the above configuration, the insertion port 20 of the connecting pipe W20 can be easily inserted into the receiving port 10 of the pipe to be joined W10, which is joined to the connecting pipe W20 by the work machine. This makes the joining work more efficient.

[0082] Furthermore, since the cover portion 53 can seal the space between the outer circumferential surface 22 of the insertion port 20 and the inner circumferential surface 11 of the receiving port 10, even if the receiving port 10 has a structure with a large inner diameter of the opening 101 that is easy to handle by the work machine, displacement of the sealing member 30 can be prevented when inserting the insertion port 20 and when water pressure is applied. In this way, it is possible to achieve both increased efficiency by the work machine and prevention of displacement of the sealing member 30.

[0083] (Other embodiments) Although embodiments of the present invention have been described above, the embodiments described above are merely examples for carrying out the present invention. Therefore, the invention is not limited to the embodiments described above, and it is possible to carry out the invention by appropriately modifying the embodiments described above without departing from the spirit of the invention.

[0084] In the above embodiment, an inside corner is formed in the sealing member 30 by the contact portion 311 of the sealing body portion 31 and the inner circumferential surface of the insertion support portion 32. However, an inside corner does not have to be formed. The sealing body portion may cover the radially inward side of the insertion support portion.

[0085] In the above embodiment, the inner diameter D1 of the portion 121 located on one side in the axial direction from the insertion support groove 112 is smaller than the inner diameter D2 of the portion 122 located on the other side in the axial direction from the insertion support groove 112. However, the inner diameter of the portion located on one side in the axial direction from the insertion support groove may be larger than the inner diameter of the portion located on the other side in the axial direction from the insertion support groove.

[0086] In the above embodiment, when the insertion port 20 of the connecting pipe W20 is joined to the receiving port 10 of the pipe to be joined, the cover portion 53 is located between the outer circumferential surface 22 of the insertion port 20 of the connecting pipe W20 and the inner circumferential surface 11 of the receiving port 10 of the pipe to be joined. However, the cover portion may be compressed radially by the outer circumferential surface of the insertion port and the inner circumferential surface of the receiving port. In addition, the cover portion may be stretched in the axial direction as a result.

[0087] In the above embodiment, before the pipe to be joined W10 is joined to the joining pipe W20, the cover portion 53 has an inclined surface whose inner diameter decreases towards one side in the axial direction. However, the cover portion may have an inclined surface whose inner diameter increases towards one side in the axial direction. The cover portion may extend parallel to the central axis. From another point of view, the cover portion may be pre-bent in the axial direction parallel to the central axis.

[0088] In the above embodiment, the protective member 50 is made of, for example, an annular resin member. However, the protective member does not have to be annular. At least one of the holding portion, end face covering portion, or cover portion of the protective member may be arc-shaped. The protective member may also be made of a metal member. Furthermore, the holding portion does not have to be U-shaped.

[0089] In the above embodiment, before the pipe to be joined W10 is joined to the joining pipe W20, the cover portion 53 overlaps at least a part of the seal body portion 31 when viewed in the axial direction of the pipe to be joined W10. That is, in the above embodiment, the cover portion 53 covers a part of the opening 101 of the receiving port 10. However, the cover portion may overlap at least a part of the seal body portion when viewed in the axial direction. The cover portion may cover the entire seal body portion when viewed in the axial direction. [Industrial applicability]

[0090] The present invention can be used in a joint structure comprising a pipe socket, a receiving end of a pipe to be joined to the pipe, and an annular sealing member that seals the space between the outer circumferential surface of the pipe socket and the inner circumferential surface of the pipe to be joined. [Explanation of Symbols]

[0091] 1: Joint structure 10: Socket 101 :Aperture 11: Inner surface 111: Groove for lock ring 112: Groove for insertion support section 113: Groove for seal body 12: Outer surface 121, 122: part 13: Flange 14: Opening end surface 20: Socket 201 :Aperture 22: Outer surface 24: Insertion port protrusion 30: Sealing material 31: Seal body 311: Contact Department 32:Insert support section 33: slippery 50: Protective parts 51: Maintaining Department 52: End face covered part 53 :Kalbabbe 91 :ロックリング D1: inner diameter D2: inner diameter W10: Connected tube W20: Connecting pipe

Claims

1. The opening of the tube, The insertion end of the aforementioned pipe is inserted through the opening, and the receiving end of the pipe to be joined is joined to the aforementioned pipe, A sealing member made of an elastic material seals the space between the outer circumferential surface of the insertion opening of the aforementioned pipe and the inner circumferential surface of the receiving opening of the pipe to be joined, A protective member that protects the sealing member, Equipped with, The aforementioned socket is, A flange located on the outer circumferential surface of the opening end of the aforementioned socket, It has grooves extending in the circumferential direction on its inner surface, The sealing member is An annular seal body portion is compressed radially by the outer circumferential surface of the insertion opening and the inner circumferential surface of the receiving opening, An insertion support portion connected to the end of the seal body portion on the receiving opening side and inserted into the groove of the receiving opening, It has, The seal body portion has a contact portion located at the end of the seal body portion on the receiving opening side, The protective member is A retaining portion that engages with and is held by the flange, An end-face covering portion connected to the holding portion and covering the open end face of the receiving opening, A cover portion connected to the end face covering portion, extending in one axial direction between the outer circumferential surface of the insertion opening of the pipe and the inner circumferential surface of the receiving opening of the pipe to be joined, to a position where it overlaps with at least a part of the insertion support portion when viewed radially, Having, Joint structure.

2. In the joint structure described in claim 1, The receiving opening has an inner diameter in the portion located on one side of the axial direction relative to the groove that is smaller than the inner diameter in the portion located on the other side of the axial direction relative to the groove. Joint structure.

3. Having a socket, A pipe that is joined to the connecting pipe by inserting the connecting pipe having an insertion port into the receiving port, A sealing member made of an elastic material seals the space between the outer circumferential surface of the insertion opening of the connecting pipe and the inner circumferential surface of the receiving opening, A protective member that protects the sealing member, Equipped with, The aforementioned socket is, A flange located on the outer circumferential surface of the opening end of the aforementioned socket, It has grooves extending in the circumferential direction on its inner surface, The sealing member is When the insertion end of the connecting pipe is joined to the receiving end of the pipe, an annular seal body portion is compressed radially by the outer surface of the insertion end and the inner surface of the receiving end, An insertion support portion is connected radially outward at the end of the seal body portion on the receiving opening side and is located within the groove of the receiving opening, It has, The seal body portion has a contact portion located at the end of the seal body portion on the receiving opening side, The protective member is A retaining portion that engages with and is held by the flange, An end-face covering portion connected to the holding portion and covering the open end face of the receiving opening, A cover portion connected to the end face covering portion and, when viewed in the axial direction of the pipe, overlapping at least a part of the seal body portion, It has, The cover portion is configured to bend between the outer surface of the insertion end of the connecting pipe and the inner surface of the receiving end of the pipe when the insertion end of the connecting pipe is inserted into the receiving end of the pipe. tube.

4. In the pipe according to claim 3, The cover portion has an inclined surface whose inner diameter decreases towards one direction in the axial direction. tube.

5. In the pipe according to claim 3 or claim 4, The cover portion extends in a bent state, as the insertion opening of the connecting pipe is inserted into the receiving opening of the pipe, to a position where it overlaps with at least a part of the insertion support portion when viewed radially. tube.

6. A protective member that is attached to the opening end of the receiving end of a pipe to be joined, into which a connecting pipe having a socket is inserted and joined, and which protects an annular sealing member attached to the inner circumferential surface of the pipe to be joined, A retaining portion that engages with and is held by a flange located on the outer circumferential surface of the opening end of the aforementioned socket, An end-face covering portion connected to the holding portion and covering the open end face of the receiving opening, The cover portion connected to the end face covering portion, It has, The aforementioned cover portion is With the holding portion held by the flange of the pipe to be joined, it covers a part of the opening of the socket and is configured to bend between the outer surface of the socket of the joining pipe and the inner surface of the socket of the pipe to be joined when the insertion end of the joining pipe is inserted into the socket of the pipe to be joined. Protective material.

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