JP7029954B2 - Duct connection structure - Google Patents

Description

The present invention relates to a duct connecting structure for connecting a piping base member of a piping duct for protecting a pipe and a joint base member of a joint duct.

The duct is used to protect pipes such as water supply pipes and hot water supply pipes. The length and orientation of such piping are set according to the layout of the equipment and the like. The duct is constructed so that the length and orientation of the duct can be adjusted to the set length and orientation of the pipe by connecting the duct for fitting to the duct for piping.

Specifically, a state in which the piping base member of the piping duct and the joint base member of the fitting duct are connected to a mounting surface such as a wall surface or ceiling surface on which the piping is arranged via an engagement mechanism. Fix it with a screw.

By the way, the engaging mechanism for connecting the piping duct and the joint duct is formed so as to protrude outward in the pipe axial direction at both ends of the joint base member in the pipe axial direction and to be separated from the mounting surface by a predetermined distance. It is composed of a protruding portion and a pipe axial end portion of a piping base member that can be inserted between the protruding portion and the mounting surface, and is a protruding portion of the joint base member fixed to the mounting surface. The joint base member and the piping base member are connected in a state where the pipe axial end is inserted between the pipe and the mounting surface (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 11-82867

However, in the configuration of Patent Document 1, the joint base members are first arranged at a plurality of positions on the mounting surface on which the joints are arranged, and the joint base members are placed between adjacent joint base members for piping later. In the case of a construction procedure such as arranging a base member, both ends of the piping base member must be inserted between the protruding portion and the mounting surface of each fitting base member while bending the piping base member. .. Therefore, in the case of a short size in which the piping base member cannot be bent, it may not be possible to connect the piping base member between the joint base members, and early improvement is desired.

In view of the above situation, the present invention is intended to provide a duct connecting structure capable of reliably connecting a piping base member and a joint base member.

The duct connection structure of the present invention connects the pipes to the pipe base member mounted on the mounting surface of the duct for piping that protects the pipes arranged along the mounting surface in order to solve the above-mentioned problems. It is a duct connecting structure for connecting a joint base member attached to the mounting surface of a joint duct that protects the joint by an engagement mechanism, and the engagement mechanism is the piping duct and the joint duct. It is provided on the base member of one of the ducts, and is provided on the protruding portion that protrudes outward along the pipe axis direction of the one duct and the back surface that faces the mounting surface of the base member of the other duct. It is characterized in that the protruding portion includes an engaged portion that engages with the back surface side in the plate thickness direction.

According to the present invention, when the other base member is engaged and connected between one adjacent base member mounted on the mounting surface at a predetermined distance, the other base member is adjacent to each other. By fitting between the base members of the above, the protruding portion provided on one base member and the engaged portion provided on the back surface of the other base member engage with each other in the plate thickness direction on the back surface side. By this engagement, it is possible to prevent the other base member from moving in the direction of separating from one base member in the plate thickness direction, and the piping base member and the joint base member are securely connected. be able to.

Further, in the duct connecting structure of the present invention, the protruding portions may be provided at both ends of the joint base member in the pipe axis direction, and the engaged portions may be provided at the piping base member.

As described above, by providing the protruding portions at both ends of the joint base member in the pipe axial direction, the joint base member is first attached to a plurality of mounting surfaces at a predetermined distance from each other, and then for adjacent joints. In a construction procedure such as connecting a base member for piping between base members, the base members can be reliably connected to each other.

Further, the duct connecting structure of the present invention is a recess in which the engaged portion is recessed from the back surface side of the base member of the other duct toward the front surface side, and the protruding portion is recessed in the recess. It may be configured to be fitted so that the outer surface of the protrusion and the inner surface of the recess are engaged in the plate thickness direction.

As described above, the protrusion can be covered with the other base member by fitting the protrusion into the recess and engaging the outer surface of the protrusion and the inner surface of the recess in the plate thickness direction.

According to the present invention, the protruding portion provided on one base member and the engaged portion provided on the back surface of the other base member engage with each other in the plate thickness direction on the back surface side, whereby the base member for piping and the joint are joined. It is possible to provide a connecting structure of a duct that can be reliably connected to a base member.

It is a front view which shows the state which engaged and temporarily fixed the piping duct between two joint ducts. It is a front view of the main part which shows the state which the piping duct is engaged with the end part of one of the joint ducts. FIG. 2 is a cross-sectional view taken along the line III-III in FIG. It is sectional drawing which shows the state just before becoming the state of FIG. It is a perspective view of the duct for a joint. It is a bottom view of a duct for a joint. FIG. 6 is a sectional view taken along line VII-VII in FIG. It is a perspective view of the duct for piping. It is sectional drawing which shows another form of the duct for piping. (A) Front view of a main part showing a state in which a piping duct is engaged with one end of a joint duct having a different engagement structure, (b) is a sectional view taken along line XX in FIG. 10 (a). Is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, two linear horizontal fluid pipes 1 and 2 juxtaposed vertically are connected to the left ends of the two linear fluid pipes 1 and 2 which are connected downward via L-shaped joints 3 and 4. The fluid pipes 5 and 6 are connected. Then, it is connected to a piping duct 7 or 8 for protecting by covering these two fluid pipes 1, 2 or 3, 4 and two joints 3, 4 and two joints 3, 4. A duct connecting structure is shown with joint ducts 9, 10 for protecting the ends of the fluid pipes 1, 2, 5, and 6. The lower portion of the joint duct 9 at the right end of FIG. 1 is the same as that of the left side, and the figure and description are omitted. One of the two fluid pipes 1 and 2 may be a hot water supply pipe through which hot water flows, and the other may be a water supply pipe through which water flows, but both may be hot water supply pipes or both may be water supply pipes. May be good. The joint ducts 9 and 10 may be configured to protect only the two joints 3 and 4.

Since the two joint ducts 9 and 10 have the same configuration, if one joint duct 10 is described, as shown in FIG. 5, the joint duct 10 has a mounting surface such as a wall surface or a ceiling surface (FIG. In 1), there are two joints 3, 4 and two joints 3 between the joint base member 11 fixed to the wall surface W and the joint base member 11 attached to the joint base member 11 by engagement. , 4 has a joint cover member 12 that forms a storage space for housing a part of the fluid pipes 1, 2, 5, and 6. The joint base member 11 and the joint cover member 12 are made of various synthetic resins.

As shown in FIGS. 5 and 6, the joint base member 11 includes an L-shaped plate-shaped joint main body 11A having a flat upper surface 11a and both ends in the pipe axial direction of the outer peripheral edge of the joint main body 11A. First standing walls 11B and 11B for forming two connection ports X1 and X2 are formed in the joint cover member 12. Each of the first standing walls 11B is configured so that the central portion is configured to have the same height and both end portions located on both sides in the width direction of the central portion are curved so as to be located upward toward the end side. A second standing wall 11C bent in an L shape is formed on the outer edge of the outer peripheral edge of the joint main body 11A, and an L-shaped bent second standing wall 11C having a length shorter than that of the second standing wall 11C is formed on the inner edge. Three standing walls (not shown) are formed. It should be noted that the outer end faces of the first standing walls 11B and 11B have a plurality of (two in FIG. 5) to prevent a loud noise from being generated due to surface contact at the time of contact with the end face of the piping base member 22. The protrusions 11T and 11T are provided.

In addition, the first to fifth dents upward in a total of five locations in the longitudinal direction of each of the two straight portions located on both sides of the curved portion of the bottom surface of the second standing wall 11C. Recessed grooves 13, 14, 15, 16 and 17 are formed. Between the first concave groove 13 formed in the curved portion of the first to fifth concave grooves 13 to 17 and the third concave groove 15 formed at the end of one straight portion, and the first concave groove. The first engaging claws 20 and 20, which will be described later, are engaged with the second concave groove 14 and the fourth concave groove 16 located between the 13 and the fifth concave groove 17 formed at the end of the other straight portion, respectively. .. Further, a sixth concave groove 18 recessed upward is formed in the curved portion of the bottom surface of the third standing wall. Two second engaging claws 21 and 21 described later are engaged with the sixth concave groove 18. In addition, in FIG. 6, a plurality of elongated holes B1 ... Through which the screw penetrates (four in FIG. 6) are formed.

Further, as shown in FIGS. 3 to 5, protrusions 19 protruding outward along the pipe axis direction are provided at both ends of the joint base member 11 in the pipe axis direction, that is, at each of the first standing walls 11B and 11B. It is integrally formed. The protruding portion 19 is a linear rod-shaped member extending along the pipe axis direction from the widthwise central portion of the end in the pipe axis direction of the joint base member 11, and will be described later as shown in FIG. It includes a main body portion 19A configured to enter the recess 25 which is a locked portion and fit into the recess 25, and a neck portion 19C extending downward to the lower end of the main body portion 19A. The protruding portion 19 and the recess 25, which is a locked portion described later, form an engaging mechanism for connecting the piping ducts 7 and 8 and the joint ducts 9 and 10. Therefore, the outer surface of the protrusion 19 and the inner surface of the recess 25, which will be described later, engage with each other in the plate thickness direction. The main body portion 19A is formed in an arc shape from both ends in the width direction of the first portion 19a having a rectangular cross-sectional shape and the first portion 19a having the same width from the lower end to the upper end side, and is a circle at the upper end. A second portion 19b in which a V-shaped elongated groove 19 m extending over the entire pipe axis direction is formed in the central portion of the arcuate surface in the width direction is provided. The neck portion 19C is formed to have a width dimension smaller than the width dimension of the main body portion 19A, and corner portions 19s and 19s are formed at both ends in the width direction of the lower end of the first portion 19a, and the corner portions 19s and 19s will be described later. By engaging with the protrusions 25T and 25T, the protrusion 19 is held in the recess 25.

As shown in FIGS. 5, 6 and 7, the joint cover member 12 is L-shaped and flat in a plan view so as to form the two connection ports X1 and X2 with the first standing walls 11B and 11B. It includes a plate-shaped top wall 12A, an L-shaped outer wall 12B extending downward from the outer peripheral edge of the top wall 12A, and an L-shaped inner side wall 12C extending downward from the inner peripheral edge of the top wall 12A. At the lower part of the inner surface of the substantially central portion in the length direction of each of the two straight portions located on both sides of the curved portion of the outer side wall 12B, the second concave groove 14 and the fourth concave groove 16 are connected to the base member 11 for fitting. The first engaging claws 20, 20 that engage in the thickness direction (vertical direction) are integrally formed. Further, in the lower part of the inner surface of the substantially central portion in the length direction of each of the two straight portions located on both sides of the curved portion of the inner side wall 12C, the sixth concave groove 18 is formed in the thickness direction (upper and lower) of the joint base member 11. The second engaging claws 21 and 21 that engage in the direction) are integrally formed.

Each first engaging claw 20 includes a rectangular plate portion 20A having a flat upper surface and a plurality of ribs 20B (six in FIG. 6) that support the plate portion 18A from below. As shown in FIG. 7, the rib 20B is configured in a triangular shape that tapers toward the lower side. Similar to the first engaging claw 20, each of the second engaging claws 21 has a parallel quadrilateral plate portion 21A having a flat upper surface and a plurality of plate portions 21A that support the plate portions 21A from below (four in FIG. 6). Rib 21B and. Each rib 21B is inclined with respect to the inner surface of the inner side wall 12C. Each rib 21B is configured in a triangular shape that tapers toward the lower side.

As shown in FIGS. 8 and 9, the piping duct 7 engages with a piping base member 22 fixed to a mounting surface (wall surface in FIG. 1) W such as a wall surface or a ceiling surface, and a piping base member 22. The pipe cover member 23 is detachably attached to the pipe base member 22 to form a storage space for accommodating the two fluid pipes 1 and 2. The piping base member 22 and the piping cover member 23 are made of various synthetic resins.

The piping base member 22 is a straight and plate-shaped piping main body 22A having a flat upper surface 22a, and the piping base member 22 at both ends in the width direction (direction orthogonal to the pipe axial direction) of the piping main body 22A. The claw receiving portions 22B and 22B as engaged portions that project upward in the thickness direction and engage with the third engaging claws 35 and 35 of the piping cover member 23 described later are integrally formed. Further, since the piping base member 22 and the piping cover member 23 are long, they are formed by extrusion molding. At the time of extrusion molding, the claw receiving portions (engaged portions) 22B and 22B provided in the piping base member 22 and the third engaging claws (engaging portions) 35 and 35 provided in the piping cover member 23 may be formed at the same time. There are advantages that can be done. Further, a recess 25 is provided on the back surface of the piping main body 22A facing the mounting surface W at the center in the width direction. The concave portion 25 is an engaged portion recessed inside the convex portion 24 formed so as to project from the back surface side of the piping main body 22A toward the front surface side.
Therefore, by engaging the protruding portion 19 with the recess 25 in the plate thickness direction from the back surface side, the joint base member 11 and the piping base member 22 can be connected to each other with respect to the joint base member 11. It is possible to prevent the piping base member 22 from moving in a direction in which the pipe base member 22 is separated in the plate thickness direction. Although the recess 25 is formed over the entire length direction of the piping base member 22, it may be formed only at both ends of the piping base member 22.

At both ends in the width direction at the bottom surface side (rear surface side facing the mounting surface W) of the recess 25, protrusions 25T projecting inward are formed over the entire length direction of the piping base member 22. By engaging the corner portions 19s and 19s of the main body portion 19A constituting the protruding portion 19 with the upper end surfaces of the protrusions 25T and 25T, the protruding portion 19 is prevented from moving from the recess 25 to the outside. .. That is, it prevents the piping base member 22 from moving in the direction of being separated from the joint base member 11 in the plate thickness direction.

Each claw receiving portion 22B includes a vertical plate portion 26 extending upward from the widthwise end of the piping main body 22A, a first horizontal plate portion 27 protruding inward in the horizontal direction from the upper end of the vertical plate portion 26, and a first horizontal plate. It includes an inclined plate portion 28 extending diagonally upward from the inner end of the portion 27 toward the outside in the width direction, and a second horizontal plate portion 29 projecting outward in the horizontal direction from the upper end of the inclined plate portion 28. In FIG. 9, the tip of the third engaging claw 35, which will be described later, engages with the boundary portion between the inclined plate portion 28 and the second horizontal plate portion 29, and the piping cover member 23 with respect to the piping base member 22. Is fixed. One of the pair of left and right leg portions 37, 37 (outside) of the support members 36, 36 that support the fluid pipes 1 and 2, which will be described later in the piping main body 22A, the vertical plate portion 26, and the first horizontal plate portion 27, respectively. It constitutes a first locking recess 30 for locking and supporting the leg 37 (located in).

Further, a pair of horizontal plate portions 31, 31 protruding outward in the width direction from both ends in the width direction of the upper end of the convex portion 24 of the gate shape are integrally formed. A pair of left and right leg portions 37, 37 of the support members 36, 36 that support the fluid pipes 1 and 2, which will be described later, by the piping main body 22A, the horizontal plate portions 31, 31 and the side wall portions 24A, 24A of the convex portion 24, respectively. The second locking recesses 32, 32 for locking and supporting the other leg portion 37 are configured.

Further, plate-shaped holding portions 33, 33 projecting upward are integrally formed on the upper surface of the gate-shaped convex portion 24. As shown in FIG. 9, a partition plate 34 for dividing the accommodation space of the piping duct 7 into two spaces in the width direction is sandwiched between the holding portions 33 and 33. The partition plate 34 includes a plate-shaped vertical plate portion 34A facing upward, and a horizontal plate portion 34B bent from the upper end of the vertical plate portion 34A toward one of the two spaces (on the left side in FIG. 9). ing. By providing the horizontal plate portion 34B, when an impact force is applied to the top wall portion 23A of the piping cover member 23, the horizontal plate portion 34B receives the impact force and absorbs a part of the impact force to cover the piping. It is possible to prevent the member 23 from being damaged. Further, by providing the vertical plate portion 34A of the partition plate 34 to divide the space into two spaces, it is possible to suppress a decrease in the hot water supply temperature of the hot water supply pipe accommodated in one of the narrowed spaces.

The piping cover member 23 includes a plate-shaped top wall portion 23A having a flat top surface and a pair of plate-shaped side wall portions 23B that are curved so as to bulge outward from both ends in the width direction of the top wall portion 23A and then hang down. , 23B, and.

A third engaging claw 35, which is an engaging portion that engages with the claw receiving portion 22B, is integrally formed on the lower portion of the inner surface of each side wall portion 23B. Each third engaging claw 35 is formed over the entire longitudinal direction of the piping cover member 23, and is composed of a linear plate-shaped portion extending diagonally upward toward the inside. As described above, the third engaging claw 35 engages with the boundary portion between the inclined plate portion 28 and the second horizontal plate portion 29, and engages the piping cover member 23 with the piping base member 22. It is fixed by.

As shown in FIG. 9, a pair of support members 36, 36 for supporting the fluid pipes 1 and 2 in a state of being separated from the upper surface of the piping base member 22 by a predetermined distance can be engaged with and detached from the piping base member 22. It is attached to. As described above, each of the support members 36 is a pair of legs 37, 37 that are engaged and fixed to the first locking recess 30 and the second locking recess 32 formed in the piping base member 22. A vertical portion 38, 38 extending upward from the inner end of the leg portions 37, 37, a pair of curved portions 39, 39 curved so as to bulge outward from the upper end of the piping cover member 23, and the curved portion. An arc-shaped connecting portion 40 that connects 39, 39 to each other and abuts on the outer surface of the fluid pipe 1 or 2, and a fluid pipe that is formed in an arc shape so as to be continuous from both ends in the width direction of the connecting portion 40 and bulge downward and outward. It is provided with holding portions 41, 41 for sandwiching and holding both sides of 1 or 2 in the width direction.

Next, the construction procedure will be described. As shown in FIG. 1, the plurality of joint base members 11 and 11 having the above configuration (two in FIG. 1) are fixed to the wall surface W at a distance corresponding to the length of the piping base member 22. Subsequently, in the construction procedure in which the piping base member 22 is later arranged between the two joint base members 11 and 11 by engagement, one of the joint base members 11 (on the left side in FIG. 1) is provided. A recess 25, which is an engaged portion formed at both ends of the piping base member 22, is formed on the protruding portion 19 and the protruding portion 19 provided on the other (right side of FIG. 1) joint base member 11 to have a plate thickness on the back surface side. A recess 25 that engages in the direction, that is, opens on the back surface of the piping base member 22 facing the wall surface W, is provided on the back surface side of the piping base member 22 on the protruding portions 19 and 19 of the left and right joint base members 11 and 11. By engaging, the piping base member 22 and the left and right joint base members 11 and 11 can be securely connected. At this time, as shown in FIG. 4, the protrusions 25T and 25T of the recess 25 of the piping base member 22 come into contact with the protrusions 19 to move the piping base member 22 while expanding the opening of the recess 25. Then, as the protrusions 25T and 25T pass through the corners 19s and 19s, they are fitted into the main body 19A of the protrusion 19 in the recess 25, and as shown in FIG. 3, the outer surface of the protrusion 19 and the recess 25 The inner surface engages in the plate thickness direction. After engaging, it is possible to prevent the piping base member 22 from moving in the direction of separating from the two joint base members 11 and 11 in the plate thickness direction, and the piping base member 22 is temporarily fixed. Is completed.

After the temporary fixing of the piping base member 22 is completed, the piping base member 22 is fixed to the wall surface W with a fixing tool such as a screw, and then the joints 3, 4 and the fluid pipes 1, 2, 5, 6 are used for piping. After being housed in the base member 22 and the joint base member 11, the piping cover member 23 and the joint cover member 12 are fixed to the piping base member 22 and the joint base member 11 by engagement to end the work. ..

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

In the above embodiment, the L-shaped joint ducts 9 and 10 are used, but a T-shaped joint duct may be used, or a linear joint duct used when extending the length of the duct. May be.

Further, in the above-described embodiment, the joint base member 11 is provided with the protruding portion 19, and the piping base member 22 is provided with the engaged portion 25. However, as shown in FIGS. 10A and 10B, the piping is provided. The base member 22 may be provided with a protrusion 22T, and the base member 11 for a joint may be provided with a recess 11H which is an engaged portion. The recess 11H is a recess opened on the surface side opposite to the wall surface W by the protrusion 11D protruding outward along the pipe axis direction from the central portion in the width direction of the joint base member 11. Further, the protruding portion 22T includes a main body portion 42 having a triangular cross-sectional shape (any shape such as a rectangular shape or a circular shape), and a neck portion 43 having a width narrower than that of the main body portion 42. Covering portions 22H and 22H that cover both sides of the protruding portion 11D of the joint base member 11 when the joint base member 11 and the piping base member 22 are connected are provided on both sides of the piping base member 22 in the width direction. There is.

Further, in the above-described embodiment, the joint base member 11 is provided with one protrusion 19, but the joint base member 11 or the piping base member 22 is provided with a plurality of protrusions and engages with the plurality of protrusions. The same number of engaged portions may be provided in the piping base member 22 or the joint base member 11.

Further, in the above-described embodiment, the piping base member 22 and the piping cover member 23 are fixed by engagement, but the piping base member 22 and the piping cover member 23 may be fixed by a fixing tool such as a screw. good. Similarly, the joint base member 11 and the joint cover member 12 may be fixed with a fixing tool such as a screw.

1,2 ... Fluid pipe, 3,4 ... Fitting, 5,6 ... Fluid pipe, 7,8 ... Piping duct, 9,10 ... Fitting duct, 11 ... Fitting base member, 11A ... Fitting body, 11B ... 1st standing wall, 11C ... 2nd standing wall, 11H ... recess, 11T ... protrusion, 11a ... top surface, 12 ... joint cover member, 12A ... top wall, 12B ... outer wall, 12C ... inner side wall, 13, 14, 15, 16, 17, 18 ... 1st to 6th concave grooves, 18A ... plate part, 19 ... protruding part, 19A ... main body part, 19C ... neck part, 19a ... 1st part, 19b ... 2nd part, 19m ... long groove , 19s ... Corner, 20 ... First engaging claw, 20A ... Plate, 20B ... Rib, 21 ... Second engaging claw, 21A ... Plate, 21B ... Rib, 22 ... Piping base member, 22A ... Piping Main body, 22B ... Claw receiving part, 22H ... Covering part, 22T ... Protruding part, 22a ... Top surface, 23 ... Piping cover member, 23A ... Top wall part, 23B ... Side wall part, 24 ... Convex part, 24A ... Side wall part , 25 ... recess (engaged portion), 25T ... protrusion, 26 ... vertical plate portion, 27 ... horizontal plate portion, 28 ... inclined plate portion, 29 ... second horizontal plate portion, 30 ... first locking recess, 31 ... Horizontal plate portion, 32 ... Second locking recess, 33 ... Holding portion, 34 ... Partition plate, 34A ... Vertical plate portion, 34B ... Horizontal plate portion, 35 ... Third engaging claw, 36 ... Support member, 37 ... legs, 38 ... vertical parts, 39 ... curved parts, 40 ... connecting parts, 41 ... holding parts, 42 ... main body parts, 43 ... neck parts, B1 ... long holes, W ... wall surfaces, X1, X2 ... connection ports

Claims (4)

A pipe base member mounted on the mounting surface of a piping duct that protects pipes arranged along the mounting surface, and a fitting base mounted on the mounting surface of a fitting duct that protects joints connecting pipes to each other. It is a duct connection structure for connecting members with an engagement mechanism.
The engaging mechanism is provided on the base member of one of the duct for piping and the duct for fitting, and has a protruding portion protruding outward along the pipe axis direction of the one duct and the other. It is provided on the base member of the duct and includes an engaged portion with which the protruding portion engages in the plate thickness direction.
The protruding portion and the engaged portion are engaged in the plate thickness direction, and the protruding portion is held by the engaged portion, so that the base member of the other duct is held against the base member of the other duct. A duct connection structure characterized by preventing members from moving in a direction away from each other in the plate thickness direction . A pipe base member mounted on the mounting surface of a piping duct that protects pipes arranged along the mounting surface, and a fitting base mounted on the mounting surface of a fitting duct that protects joints connecting pipes to each other. It is a duct connection structure for connecting members with an engagement mechanism .
The engaging mechanism is provided on the base member of one of the duct for piping and the duct for fitting, and has a protruding portion protruding outward along the pipe axis direction of the one duct and the other. It is provided on the base member of the duct and includes an engaged portion with which the protruding portion engages in the plate thickness direction.
One of the protruding portion and the engaged portion has a protrusion, and the protrusion abuts on the other of the protruding portion and the engaged portion in the plate thickness direction to form the duct of the one. A duct connecting structure characterized in that the base member of the other duct is prevented from moving in a direction away from the base member in the plate thickness direction . The engaged portion is a recess recessed so as to open toward the front surface or the back surface of the base member of the other duct, and the protrusion is configured to fit in the recess. The duct connecting structure according to claim 1 or 2, wherein the outer surface of the protrusion and the inner surface of the recess are engaged with each other in the plate thickness direction. A pipe base member mounted on the mounting surface of a piping duct that protects pipes arranged along the mounting surface, and a fitting base mounted on the mounting surface of a fitting duct that protects joints connecting pipes to each other. It is a duct connection structure for connecting members with an engagement mechanism.
The engaging mechanism is provided on the base member of one of the duct for piping and the duct for fitting, and has a protruding portion protruding outward along the pipe axis direction of the one duct and the other. It is provided on the base member of the duct and includes an engaged portion with which the protruding portion engages in the plate thickness direction.
The engaged portion is a recess opened on the front surface side or the back surface side of the base member of the other duct, and the protrusion is a main body portion configured to fit in the recess and the main body portion. With a neck formed to a width smaller than the width of the main body,
A duct connecting structure , wherein the opening side end portion of the recess is configured to engage a corner portion formed at a boundary portion between the main body portion and the neck portion .

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