JP2002139194A - Heat retaining material for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a half-split type heat retaining material having irregularities on connecting faces to be integrated, facilitating the connecting work without causing a dislocation in an integrated state, and having a connecting face structure further improving a dew condensation preventing effect by meshing striped grooves with each other. SOLUTION: Irregularly formed lock mechanisms are arranged on individual connecting faces of the split bodies of the half-split heat retaining material formed with a synthetic resin foam body in this heat retaining material for a pipe. A plurality of stripped grooves communicated with the outside or communicated with tend sections without being communicated with the outside are formed at al or part of the connecting faces including the lock mechanisms, and the striped grooves are meshed with each other when the half-split heat retaining materials are connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe heat insulating material interposed between a pipe and a pipe support.

[0002]

2. Description of the Related Art When a pipe is supported by a pipe support, a heat insulating material is widely interposed between the two.

As a heat insulating material, a structure formed of a synthetic resin foam, a two-part type, and a structure in which a concave portion and a convex portion are formed on a joint surface of the two to unite, are disclosed in J.
No. 59-56476, JP-A-8-27797
No. 0, Design Registration No. 549239, and the like.

[0004]

As described above, a configuration is known in which the heat insulating material is of a two-part type, and a symmetrical uneven surface is formed on the joint surface between the two. Although the unevenness of the joint surface is effective in maintaining the heat insulating material in a cylindrical shape, the uneven surface of the conventional heat insulating material has a straight concave shape as disclosed in Japanese Patent Application Laid-Open No. 8-277970. Because it is a ridge or a ridge, a gap occurs at the time of plumbing construction, or
A deviation may occur due to the vibration of the pipe or the like from the state of being accurately combined. In order to prevent such displacement of the united state, it is necessary to provide a groove on the outer periphery of the heat insulating material and use a support having a band that fits the width of the groove. If the width of the groove and the width of the band do not exactly match, a deviation occurs in the united state of the heat insulating material.

Conventionally, the heat insulating material was attached to the pipe in the form of being divided into upper and lower parts. However, in the case of a hanging support type of pipe support, the heat insulating material divided into two bands is temporarily fixed in advance. It is convenient to improve the work efficiency, but in the case of the conventional insulation material of the joint surface structure,
As a result of the presence of the joint surfaces at the upper and lower positions, if dew condensation occurs on the joint surface of the heat insulating material, if the above-described misalignment occurs on the joint surface, the dew easily falls and the rust prevention of the piping It is not preferable from the viewpoint.

In view of the above, the present inventor has proposed a heat insulating material for pipes having a joint surface structure that does not cause a deviation in a united state in a heat insulating material which is a two-piece type and is provided with irregularities on the joint surface and united. This was previously proposed as Japanese Patent Application No. 11-17870.

[0007] The heat insulating material for piping according to the above-mentioned proposal is:
(1) A retaining mechanism formed by unevenness is arranged on each joint surface of the heat insulating material divided into two parts made of a synthetic resin foam. (2) Two parts made of a synthetic resin foam In each of the joining surfaces of the heat insulating material divided bodies formed in the above-mentioned manner, a locking mechanism including a convex portion and a concave portion is arranged so as to have a similar shape.

As a result of further research on the technology, the present inventor has developed a pipe heat insulating material that has been further improved so that the combined state is less likely to be displaced and the joining operation is easier. This was proposed as Japanese Patent Application No. 2000-232074.

[0009] The heat insulating material for piping according to the above-mentioned proposed improvement is:
(1) The locking mechanism of the above-mentioned prior art is configured to (1) gradually taper from the center to the end;
(2) An inclined surface is formed such that the convex portion of the locking mechanism becomes closer to the end portion as it becomes higher from the central portion, and the concave portion becomes closer to the end portion as it becomes deeper from the central portion. , Respectively.

[0010] It is an object of the present invention to improve the above two prior proposed techniques with the aim of improving the dew condensation preventing effect.

[0011]

The heat insulating material for piping according to the present invention is as follows. 1. In a heat insulating material for piping, in which a locking mechanism formed of irregularities is arranged on each bonding surface of a divided body of a heat insulating material formed into two parts by a synthetic resin foam, a joint surface including the locking mechanism is provided. In whole or in part, a plurality of grooves that communicate to the outside or to the end without communicating to the outside are formed, and when the heat insulating material divided into two is joined, the grooves are engaged with each other. Characteristic insulation material for piping.

2. In a heat insulating material for piping, in which a locking mechanism formed of irregularities is disposed on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam, a convex part and a concave part of the locking mechanism A plurality of grooves leading to the outside are formed on the surface of the, and when the heat insulating material divided into two is joined,
A heat insulating material for piping, characterized in that a groove on a surface of a convex portion and a groove on a surface of a concave portion are engaged with each other.

3. In a heat insulating material for piping, a locking mechanism including a convex portion and a concave portion is arranged on each of the joint surfaces of the heat insulating material divided into two parts by a synthetic resin foam so as to have a similar shape. A plurality of grooves leading to the outside are formed on the surfaces of the convex and concave portions of the locking mechanism,
A heat insulating material for piping, wherein when the heat insulating material divided into two is joined, the groove on the surface of the convex portion and the groove on the surface of the concave portion are engaged with each other.

4. In a heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is disposed on each joint surface of the heat insulating material divided into two parts made of a synthetic resin foam, In addition, a plurality of grooves extending to the outside are formed on the surfaces of the convex portion and the concave portion of the locking mechanism, and the heat insulating material divided into two parts is joined together, with the taper gradually tapering from the center to the end. In this case, the heat insulating material for piping has a configuration in which the groove on the surface of the convex portion is engaged with the groove on the surface of the concave portion.

[0015] 5. In a heat insulating material for piping, a locking mechanism including a convex portion and a concave portion is arranged on each of the joint surfaces of the heat insulating material divided into two parts by a synthetic resin foam so as to have a similar shape. In a heat insulating material for piping in which a locking mechanism formed by a convex portion and a concave portion is arranged, the locking mechanism is configured to gradually taper from a center to an end, and A plurality of grooves leading to the outside are formed on the surfaces of the convex and concave portions,
A heat insulating material for piping, wherein when the heat insulating material divided into two is joined, the groove on the surface of the convex portion and the groove on the surface of the concave portion are engaged with each other.

6. 6. The heat insulating material for piping as described in 4 or 5 above, wherein the locking mechanism is configured to gradually increase or decrease in depth from the center toward both ends.

[7] In a heat insulating material for piping, in which a locking mechanism formed by a convex portion and a concave portion is arranged on each joint surface of a divided body of a heat insulating material formed into two parts by a synthetic resin foam, the convex portion is located at the center. The recesses are formed so as to be closer to the end side as the height increases from the center and closer to the end side as the depth increases from the center, and the recesses are formed. A plurality of grooves leading to the outside are formed on the surfaces of the convex and concave portions of the stop mechanism, and when the heat insulating material divided into two is joined, the grooves on the convex surface and the grooves on the concave surface mesh with each other. A heat insulating material for piping, characterized in that:

[8] 8. The heat insulating material for piping according to the above item 7, wherein a locking mechanism comprising a convex portion and a concave portion is arranged on each of the joint surfaces so as to have a similar shape.

9. The heat insulating material for pipes according to the above item 7 or 8, wherein an inclined surface perpendicular to the inclined surface described in the above item 7 or 8 is provided.

[10] In a heat insulating material for piping, in which a locking mechanism formed of irregularities is disposed on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam, a convex part and a concave part of the locking mechanism A plurality of grooves are formed on the surface of the surface, and the grooves are connected to the ends without being connected to the outside. When the heat insulating material divided into two is joined, the grooves on the surface of the convex portion and the grooves on the surface of the concave portion are engaged with each other. A heat insulating material for piping, characterized in that:

11. In a heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is disposed on each joint surface of the heat insulating material divided into two parts made of a synthetic resin foam, A plurality of grooves are formed on the surfaces of the protrusions and the recesses of the locking mechanism, the grooves being connected to the ends without being connected to the outside. When the divided heat insulating material is joined, the groove on the convex surface and the concave surface

12. In a heat insulating material for piping, in which a locking mechanism formed by a convex portion and a concave portion is arranged on each joint surface of a divided body of a heat insulating material formed into two parts by a synthetic resin foam, the convex portion is located at the center. The recesses are formed so as to be closer to the end side as the height increases from the center and closer to the end side as the depth increases from the center, and the recesses are formed. On the surface of the convex portion and the concave portion of the stopping mechanism, a plurality of grooves are formed that communicate with the end without communicating with the outside. When the heat insulating material divided into two is joined, the groove of the convex portion surface and the concave surface of the concave portion are formed. A heat insulating material for piping, wherein the heat insulating material has a configuration in which the groove is engaged.

13. 13. The heat insulating material for piping according to the above item 12, wherein a locking mechanism comprising a convex portion and a concave portion is arranged on each of the joint surfaces so as to have a similar shape.

14. 14. The pipe heat insulating material according to the above item 12 or 13, wherein an inclined surface perpendicular to the inclined surface described in the above item 12 or 13 is provided.

[15] In a heat insulating material for piping, in which a locking mechanism formed of irregularities is disposed on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam, a convex part and a concave part of the locking mechanism A plurality of grooves are formed on the surface of the joining surface excluding the above, and when the heat insulating material divided into two is joined, the grooves on one joining surface and the grooves on the other joining surface are engaged. A heat insulating material for piping, characterized in that:

16. In a heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is disposed on each joint surface of the heat insulating material divided into two parts made of a synthetic resin foam, A plurality of grooves leading to the outside are formed on the surface of the joint surface excluding the convex and concave portions of the locking mechanism, and the heat insulating material is divided into two parts. A heat insulating material for piping, characterized in that when joined, the groove on one surface of the joining surface and the groove on the surface of the other joining surface engage with each other.

17. In a heat insulating material for piping, in which a locking mechanism formed by a convex portion and a concave portion is arranged on each joint surface of a divided body of a heat insulating material formed into two parts by a synthetic resin foam, the convex portion is located at the center. The recesses are formed so as to be closer to the end side as the height increases from the center and closer to the end side as the depth increases from the center, and the recesses are formed. A plurality of grooves leading to the outside are formed on the surface of the joining surface excluding the convex and concave portions of the stopping mechanism, and when the heat insulating material divided into two is joined,
A heat insulating material for piping, wherein a groove on one joint surface and a groove on the other joint surface mesh with each other.

18. 18. The heat insulating material for piping according to the above item 17, wherein a locking mechanism comprising a convex portion and a concave portion is arranged on each of the joint surfaces so as to have a similar shape.

19. 19. The pipe heat insulating material according to the above 17 or 18, wherein an inclined surface perpendicular to the inclined surface according to the above 17 or 18 is provided.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below. First, the embodiment shown in FIG. 1 will be described. The heat insulating material 10 of this embodiment is used when a pipe is suspended from a ceiling or the like by a pipe hanging bracket or the like. The heat insulating material 10 is formed of a heat-insulating synthetic resin foam such as urethane, and a pair of the same shape is used by being combined.
Each of the bonding surfaces 11 and 12 has a convex portion 13 and a concave portion 14.
Are arranged in a similar manner. Therefore, when the pair of divided heat insulating materials 10 are united, the projections 13 and the depressions 14 of the other divisional body become the concaves 14 and the projections 13 of the other divisionalization on the joining surfaces 11 and 12. The respective segments are fitted with each other, and the movement of each of the divided members in the arrow direction is restricted.

Grooves 13A and 14A communicating with the outside are formed on the surfaces of the convex portion 13 and the concave portion 14. When the heat insulating material 10 divided into two parts is joined, a plurality of grooves 1A on the surface of the convex portion 13 are formed.
3A and a plurality of grooves 14A on the surface of the concave portion 14 are configured to mesh with each other. In the present invention, the surface of the convex portion 13 includes three cases: a case where only the top portion is a flat portion; a case where only the side wall portion excluding the top portion is provided; The same applies to the surface of the concave portion 14.

According to the present invention, when the heat insulating material 10 is joined, the grooves 13A and 14A mesh with each other, so that the dew condensation preventing effect is improved.

As the grooves 13A and 14A, the uppermost surface of the convex portion 13 and the concave portion 1 as in the embodiment (A in FIG. 8) of this embodiment.
4 may be formed not only on the lowermost surface but also on a portion other than the uppermost surface and the lowermost surface, or may be formed on the entire joining surfaces 11 and 12 of the heat insulating material 10 as shown in FIG. 8B. Alternatively, it may be formed in a direction orthogonal to the modes of A and B in FIG. 8 (see C in FIG. 8) or may be formed in an oblique direction.

In the case of the aspect formed in the orthogonal direction, only the uppermost surface of the convex portion 13 and the lowermost surface of the concave portion 14
Since a configuration that leads to the outside cannot be achieved, it is preferable to form a groove on a portion other than the uppermost surface of the convex portion 13 and the lowermost surface of the concave portion 14. That is, in the present invention having the grooves leading to the outside, any structure may be used as long as the plurality of grooves 13A and 14A are connected to the outside and mesh at the time of joining, and the direction of the grooves is not limited to one direction. Alternatively, a plurality of directions may be mixed.

Next, a description will be given of the present invention having a groove leading to the end without leading to the outside. 13A ・ 1
As shown in FIG. 8D, FIG. 8D shows a mode 4A in which only the uppermost surface of the convex portion 13 and the lowermost surface of the concave portion 14 are formed and which is formed in a direction orthogonal to the above-mentioned mode of FIG. In this embodiment, the grooves 13A and 14A do not communicate with the outside in the joined state, but the uneven portions 13 and
14 are connected to each end.

Further, as an example of the present invention having a groove extending to the outside, the joining surface 11 excluding the entire convex portion 13 and the concave portion 14 is used.
FIG. 8E shows an embodiment in which the grooves 11A and 12A are formed in FIG.
And F. In these embodiments, the grooves 11A
The formation direction of the grooves of 12A, 13A and 14A may be formed in an oblique direction, or may be mixed in a plurality of directions.

The grooves 11A, 12A, 13A, 14
The number, width, height, or depth of A is not particularly limited, and various numerical values can be employed. Preferably, the width, height, or depth is about 0.5 mm. In addition, groove 11A
The shapes of the grooves 12A, 13A, and 14A are not limited to the straight lines shown in the figure, but may be curves such as wavy lines and zigzag shapes.

The grooves 11A, 12A,
13A and 14A have the same configuration in other embodiments described below.

In the illustrated embodiment, the projection 1 is used as a locking mechanism.
Although the two types of combination of 3 and the concave portion 14 are used, the number may be three or more.

Although not shown, the pipe hanging fitting is arranged such that its band portion is located on the concave surface portion 15 provided on the peripheral surface. In the present invention, since the united divided body does not move in the direction of the arrow due to the above-described locking mechanism, there may be a mismatch between the width of the band of the pipe hanging metal fitting and the width of the concave portion 15. .

In addition, a band portion (a pair) of a pipe hanging bracket.
In the embodiment in which the joints are temporarily fixed in advance with a double-sided adhesive tape or the like, the divided bodies are arranged so that the joining surface is not in the horizontal direction as shown in the figure but in the vertical direction.

The embodiment shown in FIG. 2 will be described. The heat insulating material 10 of this embodiment is used when a pipe is supported on a floor by a support band as a stationary type. The structure of the heat insulating material 10 is the same as that of the embodiment shown in FIG. 1 except that the bottom of one of the divided bodies is configured to be installed on the floor.

In the embodiment shown in FIG. 3, the protrusion 1 of the locking mechanism is used.
The arrangement position and shape of 3 and recess 14 are different from those of the other embodiments.

The embodiment shown in FIGS. 4 and 7 will be described. The locking mechanism of this embodiment is configured such that the convex portion 13 is gradually tapered and higher from the center to the end, and the concave portion 14 is gradually tapered from the center to the end. It is configured to be deep.

The projection 13 is formed so that it becomes closer to the end as it becomes higher from the center and the recess 14 becomes closer to the end as it becomes deeper from the center. Surface 15 is constituted. With this configuration, the joining operation of the divided bodies is further facilitated.

In the embodiment shown in the figures, the combination of the projection 13 and the recess 14 is used as the locking mechanism.
It may be divided or more.

The embodiment shown in FIG. 5 will be described. The heat insulating material 10 of this embodiment is used when a pipe is supported on a floor by a support band as a stationary type. The configuration of the heat insulating material 10 is the same as that of the embodiment shown in FIG. 4 except that the bottom of one of the divided bodies is configured to be installed on the floor.

In the embodiment shown in FIG. 6, the protrusion 1 of the locking mechanism is used.
The arrangement position and shape of 3 and recess 14 are different from those of the other embodiments. In addition, the inclined surface 1 is also provided on the side surfaces of the convex portion 13 and the concave portion 14.
5 'is provided.

[0049]

According to the heat insulating material of the present invention, the combined heat insulating material does not displace during piping work or due to vibration, etc. This facilitates the joining operation of the divided bodies, and furthermore, the engagement of the grooves further improves the effect of preventing dew condensation, thereby solving the problem described above.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a heat insulating material according to the present invention shown in claim 1;

FIG. 2 is a perspective view showing another embodiment of the heat insulating material according to the present invention shown in claim 1.

FIG. 3 is a perspective view showing another embodiment of the heat insulating material according to the present invention shown in claim 2;

FIG. 4 is a perspective view showing an embodiment of the heat insulating material according to the present invention shown in claim 3;

FIG. 5 is a perspective view showing another embodiment of the heat insulating material according to the present invention shown in claim 3;

FIG. 6 is a perspective view showing another embodiment of the heat insulating material according to the present invention shown in claim 4.

FIG. 7 is a plan view (A), a front view (B), a partially cutaway right side view (C), and a main part perspective view (D) of the heat insulating material divided body shown in FIG.

FIG. 8 is a plan view of one joint surface showing each aspect of the groove.

[Explanation of symbols]

 Reference Signs List 10-Insulation material 11-Joint surface 11A-groove 12-Joint surface 12A-groove 13-Protrusion of locking mechanism 13A-groove 14-Recess of locking mechanism 14A-groove 15, 15'-inclined surface 16-concave surface

Claims (19)

[Claims] 1. A heat insulating material for piping, wherein a locking mechanism formed by irregularities is disposed on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam. A plurality of grooves that communicate with the outside or the end without communicating with the outside are formed on all or a part of the bonding surface including, and when the heat insulating material divided into two is joined, the grooves engage with each other. A heat insulating material for piping, having a configuration. 2. A heat insulating material for a pipe, wherein a locking mechanism formed of irregularities is disposed on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam. A plurality of grooves leading to the outside are formed on the surface of the convex portion and the concave portion, and when the heat insulating material divided into two is joined, the groove on the convex portion and the groove on the concave surface are engaged. A heat insulating material for piping characterized by the following. 3. A pipe in which a locking mechanism composed of a convex portion and a concave portion is arranged on each of the joining surfaces of the heat insulator divided into two parts by a synthetic resin foam so as to have a similar shape. In the heat insulating material for use, a plurality of grooves leading to the outside are formed on the surfaces of the convex portion and the concave portion of the locking mechanism, and when the heat insulating material divided into two is joined, the groove on the convex portion surface and the concave surface of the concave portion are formed. A heat insulating material for piping, wherein the heat insulating material has a configuration in which the groove is engaged. 4. A heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is disposed on each joint surface of a heat insulating material divided into two parts by a synthetic resin foam.
The locking mechanism is configured such that it gradually tapers from the center to the end, and a plurality of grooves leading to the outside are formed on the surfaces of the protrusions and the recesses of the locking mechanism, so that the locking mechanism is divided into two. A heat insulating material for piping, wherein when the heat insulating material is joined, the groove on the surface of the convex portion and the groove on the surface of the concave portion engage with each other. 5. A pipe in which a locking mechanism composed of a convex portion and a concave portion is arranged on each of the joint surfaces of the heat insulating material divided into two parts by a synthetic resin foam so as to have a similar shape. In the heat insulating material for piping, in the heat insulating material for piping in which a locking mechanism formed by a convex portion and a concave portion is arranged, the locking mechanism is configured to gradually taper from the center toward the end, A plurality of grooves leading to the outside are formed on the surfaces of the protrusion and the recess of the locking mechanism, and when the heat insulating material divided into two is joined, the grooves on the surface of the protrusion mesh with the grooves on the surface of the recess. A heat insulating material for piping, having a configuration. 6. A heat insulating material for a pipe according to claim 4, wherein said locking mechanism is configured to be gradually higher or deeper from the center toward both ends. 7. A heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is disposed on each joint surface of a heat insulating material divided into two parts by a synthetic resin foam.
The convex portion is formed so as to be closer to the end side as it is higher from the central portion, and the concave portion is formed as an inclined surface by being formed closer to the end portion as it becomes deeper from the central portion. In addition, a plurality of grooves leading to the outside are formed on the surfaces of the protrusions and the recesses of the locking mechanism, and when the heat insulating material divided into two is joined, the grooves on the surface of the protrusions and the grooves on the surface of the recesses are formed. A heat insulating material for piping, wherein the heat insulating material is configured to mesh with the heat insulating material. 8. The heat insulating material for piping according to claim 7, wherein a locking mechanism comprising a convex portion and a concave portion is arranged on each of the joint surfaces so as to have a similar shape. 9. The heat insulating material for piping according to claim 7, wherein an inclined surface perpendicular to the inclined surface according to claim 7 or 8 is provided. 10. A heat insulating material for piping, wherein a locking mechanism formed of irregularities is disposed on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam. A plurality of grooves are formed on the surface of the convex portion and the concave portion which communicate with the end portion without communicating with the outside. When the heat insulating material divided into two is joined, the groove on the convex portion surface and the groove on the concave portion surface are formed. A heat insulating material for piping, wherein the heat insulating material is configured to mesh with the heat insulating material. 11. A pipe heat insulating material in which a locking mechanism formed by a convex portion and a concave portion is arranged on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam. The locking mechanism is configured to gradually taper from the center to the end, and a plurality of grooves are formed on the surfaces of the protrusions and the recesses of the locking mechanism without leading to the outside. When the heat insulating material divided into two parts is joined, the groove on the convex part surface and the concave part surface 12. A pipe heat insulating material in which a locking mechanism formed by a convex portion and a concave portion is arranged on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam. The convex portion is formed so as to be closer to the end side as it is higher from the central portion, and the concave portion is formed as an inclined surface by being formed closer to the end portion as it becomes deeper from the central portion. In addition, a plurality of grooves are formed on the surfaces of the protrusions and the recesses of the locking mechanism and communicate with the ends without communicating with the outside. A heat insulating material for piping, wherein the groove and the groove on the surface of the concave portion are engaged with each other. 13. The heat insulating material for piping according to claim 12, wherein a locking mechanism comprising a convex portion and a concave portion is arranged on each of the joint surfaces so as to have a similar shape. 14. A heat insulating material for piping according to claim 12, wherein an inclined surface perpendicular to the inclined surface according to claim 12 or 13 is provided. 15. A heat insulating material for piping, wherein a locking mechanism formed of irregularities is arranged on each joint surface of a heat insulating material divided into two parts made of a synthetic resin foam. A plurality of grooves are formed on the surface of the joint surface excluding the convex portion and the concave portion, and when the heat insulating material divided into two is joined, the groove on one joint surface surface and the groove on the other joint surface surface A heat insulating material for piping, wherein the heat insulating material is configured to mesh with the pipe. 16. A heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is disposed on each joint surface of a heat insulating material divided into two parts by a synthetic resin foam. The locking mechanism is configured to be gradually tapered from the center toward the end, and a plurality of grooves that communicate to the outside are formed on the surface of the joining surface excluding the convex and concave portions of the locking mechanism, A heat insulating material for piping, wherein when the heat insulating material divided into two is joined, the groove on one surface of the joining surface is engaged with the groove on the surface of the other joining surface. 17. A heat insulating material for piping, wherein a locking mechanism formed by a convex portion and a concave portion is arranged on each joint surface of a heat insulating material divided into two parts by a synthetic resin foam. The convex portion is formed so as to be closer to the end side as it is higher from the central portion, and the concave portion is formed as an inclined surface by being formed closer to the end portion as it becomes deeper from the central portion. In addition, a plurality of grooves leading to the outside are formed on the surface of the joint surface excluding the convex portion and the concave portion of the locking mechanism, and when the heat insulating material divided into two is joined, the groove on one surface of the joint surface is formed. And a groove on the surface of the other joint surface. 18. The heat insulating material for piping according to claim 17, wherein a locking mechanism comprising a convex portion and a concave portion is arranged on each of the joint surfaces so as to have a similar shape. 19. The heat insulating material for piping according to claim 17, wherein an inclined surface perpendicular to the inclined surface according to claim 17 or 18 is provided.