JP7330464B2 - Insulation structure for cylindrical pipes - Google Patents

Description

In the present invention, a semicircular heat-insulating member divided into two in the circumferential direction of the cylindrical pipe is provided on the outer periphery of the cylindrical pipe through which the low-temperature fluid flows, in the circumferential direction of the cylindrical pipe in a state where the end surfaces are butted against each other. The present invention relates to a cylindrical pipe heat insulating structure provided in a state in which a pair of adjacent heat insulating member end portions are connected by a long connecting member along the axial direction of the cylindrical pipe at each of two opposing locations.

Such a heat insulating structure for a cylindrical pipe insulates the cylindrical pipe by covering the outer circumference of the cylindrical pipe through which a low-temperature fluid such as LNG or LPG flows with a heat insulating member. A plurality of layers (for example, two layers or three layers) are covered with a heat insulating member.
When the cylindrical pipe is covered with a plurality of layers, heat insulating members having different diameters are provided in a state of being concentrically superimposed.

As a conventional example of a heat insulating structure for a cylindrical pipe, a pair of heat insulating member ends connected by a connecting member are provided with groove-shaped engaging portions for engaging the connecting member, and the cylindrical pipe is formed from the end face of the heat insulating member end portion. The recessed groove portion recessed in the circumferential direction is formed in a form provided with a locking groove portion recessed radially outward of the cylindrical pipe on the radially outer side portion of the cylindrical pipe of the recessed groove portion, and the connecting member However, there is one in which the cross-sectional shape is formed so as to have a main body connecting portion that engages with the recessed grooves of the pair of ends of the heat insulating member, and a pair of locking connecting portions that engage with the locking grooves. (See Patent Document 1, for example).

JP 2016-194368 A

Cylindrical pipes are generally formed in a state in which connecting flanges are provided at both ends, and a plurality of cylindrical pipes are flange-connected to form a flow path through which a low-temperature fluid flows. In some cases, the connecting flange portion of the cylindrical pipe is connected to a valve such as an on-off valve.
When the heat insulating member is attached to the outer peripheral portion of the cylindrical pipe, the heat insulating member having a predetermined length in the axial direction of the cylindrical pipe is sequentially attached from one end to the other end of the cylindrical pipe. Become.

That is, in a state where the semicircular heat insulating members, which are divided into two in the circumferential direction of the cylindrical pipe at a location adjacent to one end of the cylindrical pipe, are arranged in the circumferential direction of the cylindrical pipe with their end faces facing each other, While moving the long connecting member in the longitudinal direction, the heat insulating member is fitted (inserted) into the recessed grooves formed in the ends of the pair of heat insulating members, and then the heat insulating member that has been completely fitted. At a location adjacent to the cylindrical pipe, the semicircular heat insulating members divided in the circumferential direction of the cylindrical pipe are arranged in the circumferential direction of the cylindrical pipe with the end faces facing each other, and in that state, a long length While moving the connecting member in the longitudinal direction, the heat insulating member is attached (inserted) by engaging (inserting) into recessed grooves formed in the ends of the pair of heat insulating members, respectively, from one end to the other end of the cylindrical tube. It will be done in order.

However, when the heat insulating member is mounted sequentially from one end of the cylindrical pipe toward the other end, and finally the heat insulating member is mounted at a location adjacent to the other end of the cylindrical pipe, the other end of the cylindrical pipe Since the flanges of the part block the recessed grooves formed in the ends of the pair of heat insulating members, the flanges become an obstacle, and the pair of heat insulating members are moved while moving the long connecting member in the longitudinal direction. It becomes impossible to engage (insert) the recessed grooves formed in the respective ends of the member.

That is, in order to engage (insert) the long connecting member into the recessed grooves formed in the pair of ends of the heat insulating member while moving in the longitudinal direction, it is necessary to A space corresponding to the length of the connecting member is required at the side portion, but when the heat insulating member is attached to the portion adjacent to the other end of the cylindrical pipe, the length of the connecting member is required for the flange. It becomes impossible to secure a space equivalent to

Incidentally, a gap is formed between the flange of the other end of the cylindrical tube and the heat insulating member, and the long connecting member is bent to engage with the recessed grooves formed on the ends of the pair of heat insulating members. (Insertion) is conceivable, but in this case, there is a risk that the long connecting member will break and cannot be engaged (inserted) into the recessed groove.

For this reason, as shown in FIGS. 17 and 18, each of a pair of heat insulating member end portions at a location where the end surfaces of the semicircular heat insulating member P divided in the circumferential direction of the cylindrical pipe 1 face each other is provided with a cylindrical heat insulating member. It is conceivable to form a stepped fitting portion Z having a stepped shape along the radial direction of the tube 1 . Incidentally, FIGS. 17 and 18 illustrate the case where the heat insulating members are mounted in three layers.

However, in this case, since the number of types of heat insulating members P having stepped fitting portions Z increases, manufacturing and management become complicated. Even if they are fitted together, the fitting is likely to be disengaged, and there is a problem that it is difficult to attach the heat insulating member P favorably.
In other words, the stepped fitting portions Z at the ends of the pair of heat insulating members are basically held in the fitted state by frictional force in the fitted state, so the fitting is likely to come off. is.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a connecting member even if there is no space corresponding to the length of the connecting member on one side of the cylindrical pipe in the axial direction of the heat insulating member. An object of the present invention is to provide a heat insulating structure for a cylindrical pipe in which a member can be mounted in a state in which it is difficult to disengage from the heat insulating member.

In the heat insulating structure for a cylindrical pipe of the present invention, a semicircular heat insulating member, which is divided into two in the circumferential direction of the cylindrical pipe, is attached to the outer peripheral portion of the cylindrical pipe through which the low-temperature fluid flows, with the end faces of the cylindrical pipe facing each other. At each of the two opposing locations located in the circumferential direction of the pipe, a pair of adjacent ends of the heat insulating member are connected along the axial direction of the cylindrical pipe by a long connecting member. and its characteristic configuration is
A groove-shaped engaging portion with which the connection member engages with each of the pair of ends of the heat insulating member at one side of the two opposing portions is provided in the radial direction of the cylindrical tube at the end of the heat insulating member. The cut portion obtained by cutting the inner portion of the cylindrical pipe along the circumferential direction of the cut portion is recessed radially outward of the cylindrical pipe into the radially outer side portion of the cylindrical pipe of the cut portion. formed in a form comprising a recess for
The connecting member at one of the two opposing locations has a cross-sectional shape that is engaged with the cut portion of each of the pair of ends of the heat insulating member, and a pair of engagement recesses. is formed in a form comprising a locking projection of
Along the tangential direction of the cylindrical tube from the end face as a groove-shaped engaging portion that the connecting member engages with each of the pair of the heat insulating member end portions at the other side of the two opposing locations The concave recessed portion is formed so that each of the inner surface and the outer surface aligned along the radial direction of the cylindrical tube is a flat surface along the tangential direction of the cylindrical tube,
The connecting member at the other of the two opposing locations is formed to have a cross-sectional shape having flat surfaces along the inner and outer surfaces of the recessed portions of the pair of ends of the heat insulating member. in the point.

Incidentally, the tangential direction of the cylindrical pipe mentioned above is the tangential direction of the cylindrical pipe at the opposing position where the end surfaces of the pair of heat insulating members are positioned in a state of facing each other.

That is, a pair of adjacent ends of the heat insulating member are connected by a connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end surfaces of the heat insulating member divided into two parts facing each other. To do so, for example, the following procedure can be used.
First, each of the engaging portions formed at both ends of one side of a pair of semicircular heat insulating members divided into two has a main body portion, a connection member having a locking convex portion, and a flat surface. Engaging shaped connecting members. Incidentally, the connection member having the body portion and the locking projection is engaged with the engaging portion formed as a cutaway portion having the locking recess, and the connection member having a shape having a flat surface extends from the end face of the cylindrical tube. It engages with an engaging portion that is formed as a recess that is recessed in the tangential direction.

After that, the heat insulating member on one side, which is engaged with the connecting member having the main body portion, the connecting member having the locking protrusion, and the connecting member having a shape having a flat surface, is attached to the outer peripheral portion of the cylindrical pipe.
Next, first, the engaging portion formed on one end side of the heat insulating member on the other side with respect to the connection member including the main body portion and the locking projection portion, that is, formed as a cutaway portion having a locking concave portion. The engaging portion is moved from a position corresponding to the outside of the cylindrical pipe in a direction of approaching the cylindrical pipe and engaged.

Next, with respect to the connection member having a shape having a flat surface, it is formed as an engaging portion formed on the other end side of the heat insulating member on the other side, that is, formed as a recessed portion recessed from the end face in the tangential direction of the cylindrical pipe. The engaging portion to be engaged is moved in the tangential direction of the cylindrical pipe at the opposite position where the end surfaces of the pair of heat insulating members are opposed to each other.

In such a procedure, a pair of adjacent heat insulating member end portions are connected to the connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end faces of the two divided heat insulating members facing each other. By connecting them together, even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical tube, the connecting member can be attached.

Moreover, in a state in which the engaging portion formed as the cut portion having the locking recess is engaged with the connection member having the main body portion and the locking projection, the locking projection becomes the locking recess. By locking the main body portion, the connecting member having the locking convex portion and the engaging portion are less likely to be disengaged.
Further, in a state in which the connecting member having a shape having a flat surface is engaged with the engaging portion formed as a recessed portion recessed from the end face in the tangential direction of the cylindrical pipe, for example, the heat insulating member Even if an attempt is made to make a rotational movement around the engaging portion of the connecting member provided with the locking convex portion, the recessed portion is arranged along the radial direction of the cylindrical pipe and is formed on a flat surface along the tangential direction of the cylindrical pipe. Flat surfaces along the inner and outer surfaces of the recessed portion of the connection member having a flat surface are brought into contact with the side surfaces and the outer surface, respectively, thereby preventing the rotational movement of the connection member. It becomes difficult to disengage the connecting member having a shape having a surface and the engaging portion.

In short, according to the cylindrical pipe heat insulating structure of the present invention, the connecting member can be engaged with the heat insulating member even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical pipe. It can be worn in a state where it is difficult to remove.

In the heat insulating structure for a cylindrical pipe of the present invention, a semicircular heat insulating member, which is divided into two in the circumferential direction of the cylindrical pipe, is attached to the outer peripheral portion of the cylindrical pipe through which the low-temperature fluid flows, with the end faces of the cylindrical pipe facing each other. At each of the two opposing locations located in the circumferential direction of the pipe, a pair of adjacent ends of the heat insulating member are connected along the axial direction of the cylindrical pipe by a long connecting member. and its characteristic configuration is
A groove-shaped engaging portion with which the connection member engages is formed on each of the pair of ends of the heat insulating member at the two opposing locations, and the inner portion of the end portion of the heat insulating member in the radial direction of the cylindrical tube is provided. The cut portion cut along the circumferential direction of the cylindrical tube is provided with a locking recess that is recessed radially outward of the cylindrical tube on the radially outer side portion of the cut portion of the cylindrical tube. formed,
The connecting member at the two opposing locations has a cross-sectional shape of a body portion that engages with the respective cut portions of the pair of ends of the heat insulating member and a pair of locking projections that engage with the locking concave portion. The point is that it is formed in a form comprising

That is, a pair of adjacent ends of the heat insulating member are connected by a connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end surfaces of the heat insulating member divided into two parts facing each other. To do so, for example, the following procedure can be used.
First, a connecting member having a body portion and a locking projection is engaged with each of the engaging portions formed at both ends of one side of a pair of semicircular heat insulating members divided into two.

After that, the heat insulating member on one side is attached to the outer peripheral portion of the cylindrical tube, with both ends of the connection member having the main body portion and the engaging protrusions engaged with each other.
Subsequently, first, an engaging portion formed on one end side of the heat insulating member on the other side with respect to one of the pair of connection members including the main body portion and the locking convex portion, that is, the cutting portion provided with the locking concave portion The engaging portion formed as a portion is engaged while being moved in a direction to approach the cylindrical pipe from a position corresponding to the outside of the cylindrical pipe.

Next, the engaging portion formed on the other end side of the heat insulating member on the other side of the other of the pair of connection members comprising the main body portion and the locking projection portion, that is, the cut portion having the locking concave portion is moved from a position corresponding to the outside of the cylindrical pipe in a direction of approaching the cylindrical pipe to engage.

Incidentally, when moving the engaging portion formed on the other end side of the heat insulating member on the other side in the direction of approaching the cylindrical pipe from a position corresponding to the outside of the cylindrical pipe, the heat insulating member on the other side must be moved. Since the cylindrical tube is elastically deformed so as to expand and contract along the radial direction, it is advantageous if the diameter of the heat insulating member is larger than the height of the locking protrusion.

In such a procedure, a pair of adjacent heat insulating member end portions are connected to the connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end faces of the two divided heat insulating members facing each other. By connecting them together, even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical tube, the connecting member can be attached.

Moreover, in a state in which the engaging portion formed as the cut portion having the locking recess is engaged with the connection member having the main body portion and the locking projection, the locking projection becomes the locking recess. By locking the main body portion, the connecting member having the locking convex portion and the engaging portion are less likely to be disengaged.

In short, according to the cylindrical pipe heat insulating structure of the present invention, the connecting member can be engaged with the heat insulating member even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical pipe. It can be worn in a state where it is difficult to remove.

In the heat insulating structure for a cylindrical pipe of the present invention, a semicircular heat insulating member, which is divided into two in the circumferential direction of the cylindrical pipe, is attached to the outer peripheral portion of the cylindrical pipe through which the low-temperature fluid flows, with the end faces of the cylindrical pipe facing each other. At each of the two opposing locations located in the circumferential direction of the pipe, a pair of adjacent ends of the heat insulating member are connected along the axial direction of the cylindrical pipe by a long connecting member. and its characteristic configuration is
At each of the pair of ends of the heat insulating member at the two opposing locations, recessed portions recessed from the end faces along the tangential direction of the cylindrical pipe are formed as groove-shaped engaging portions with which the connecting member engages. , formed in a form in which each of the inner surface and the outer surface aligned along the radial direction of the cylindrical tube is a flat surface along the tangential direction of the cylindrical tube,
The connecting members at the two opposing locations are formed to have a cross-sectional shape with flat surfaces along the inner and outer surfaces of the recessed portions of the pair of ends of the heat insulating member ,
The connecting member formed in a shape having a flat surface is formed of an elastically deformable material, and the engaging portion on one side of a pair of engaging portions that engage the adjacent recessed portions of the connecting member is provided with: The point is that a slit is formed to separate the engaging portion in the radial direction of the cylindrical tube .

Incidentally, the tangential direction of the cylindrical pipe mentioned above is the tangential direction of the cylindrical pipe at the opposing position where the end surfaces of the pair of heat insulating members are positioned in a state of facing each other.

That is, a pair of adjacent ends of the heat insulating member are connected by a connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end surfaces of the heat insulating member divided into two parts facing each other. To do so, for example, the following procedure can be used.
First, a connecting member having a shape having a flat surface is engaged with each of the engaging portions formed at both ends of one side of a pair of semicircular heat insulating members divided into two.

After that, the heat insulating member on one side is attached to the outer peripheral portion of the cylindrical pipe, the connecting member having a shape having a flat surface being engaged with both ends thereof.
Subsequently, the heat insulating member on the other side is moved so as to approach the cylindrical pipe, and the heat insulating member on the other side is connected to the connection member having a flat surface that is engaged with both ends of the heat insulating member on the one side. The engaging portions formed at both ends of the members, that is, the engaging portions formed as recessed portions recessed from the end faces in the tangential direction of the cylindrical tube, are positioned with the end faces of the pair of heat insulating members facing each other. It is engaged while being moved in the tangential direction of the cylindrical tube at the opposing location.

In such a procedure, a pair of adjacent heat insulating member end portions are connected to the connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end faces of the two divided heat insulating members facing each other. By connecting them together, even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical tube, the connecting member can be attached.

Moreover, in a state in which the connecting member having a shape having a flat surface is engaged with the engaging portion formed as a recessed portion recessed from the end face in the tangential direction of the cylindrical pipe, for example, the heat insulating member is placed on one side. Each of the inner surface and the outer surface formed on a flat surface aligned along the radial direction of the cylindrical tube of the recessed portion and along the tangential direction of the cylindrical tube , the flat surface along the inner and outer surfaces of the recessed portion of the connecting member having a flat surface contacts, and the rotational movement is prevented, etc., so that the connection of the shape having a flat surface The engagement between the member and the engagement portion becomes difficult to disengage.

In short, according to the cylindrical pipe heat insulating structure of the present invention, the connecting member can be engaged with the heat insulating member even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical pipe. It can be attached in a state where it is difficult to remove.
Further, a slit separating the engaging portions in the radial direction of the cylindrical tube is provided on one side of the engaging portions of the pair of engaging portions that engage the adjacent recessed portions of the connection member formed in a shape having a flat surface. is formed, for example, the engaging portion of the pair of engaging portions of the connecting member where the slit is not formed is engaged with the engaging portion of the heat insulating member to be mounted first of the pair of heat insulating members. so that the engaging portion of one of the pair of heat insulating members to be mounted later is engaged with the engaging portion of the pair of engaging portions of the connecting member in which the slit is formed. By doing so, the engaging portion can be engaged with the engaging portion while elastically deforming the engaging portion in which the slit is formed.
That is, when the engaging portion formed with the slit is pressed so as to be sandwiched in the radial direction, the formation of the slit can reduce the width of the cylindrical tube along the radial direction. The engaging portion of the heat insulating member is preferably engaged with the engaging portion where the slit is formed while elastically deforming the engaging portion formed with the slit so as to reduce the width along the radial direction of the cylindrical tube. be able to.
Incidentally, the width along the radial direction of the cylindrical tube of the engaging portion where the slit is formed should be slightly larger than the width between the inner and outer surfaces of the recess forming the engaging portion. Therefore, when the engaging portion of the heat insulating member is engaged with the engaging portion in which the slit is formed, the inner surface and the outer surface of the recessed portion forming the engaging portion are engaged with the engaging portion in which the slit is formed. By increasing the contact pressure with the mating portion, it is possible to make it difficult to come off.
In short, according to the characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention, the engaging portion of the heat insulating member to be mounted later of the pair of heat insulating members is formed with the slit of the pair of engaging portions of the connecting member. It is possible to satisfactorily engage with the engaging portion that is present.
In the heat insulating structure for a cylindrical pipe of the present invention, a semicircular heat insulating member, which is divided into two in the circumferential direction of the cylindrical pipe, is attached to the outer peripheral portion of the cylindrical pipe through which the low-temperature fluid flows, with the end faces of the cylindrical pipe facing each other. At each of the two opposing locations located in the circumferential direction of the pipe, a pair of adjacent ends of the heat insulating member are connected along the axial direction of the cylindrical pipe by a long connecting member. and its characteristic configuration is
At each of the pair of ends of the heat insulating member at the two opposing locations, recessed portions recessed from the end faces along the tangential direction of the cylindrical pipe are formed as groove-shaped engaging portions with which the connecting member engages. , formed in a form in which each of the inner surface and the outer surface aligned along the radial direction of the cylindrical tube is a flat surface along the tangential direction of the cylindrical tube,
The connecting members at the two opposing locations are formed to have a cross-sectional shape with flat surfaces along the inner and outer surfaces of the recessed portions of the pair of ends of the heat insulating member,
The connecting member formed in a shape having a flat surface is formed of an elastically deformable material, and the engaging portions are provided in each of a pair of engaging portions that engage with the adjacent recessed portions of the connecting member. The point is that a slit is formed to separate the cylindrical tube in the radial direction.
Incidentally, the tangential direction of the cylindrical pipe mentioned above is the tangential direction of the cylindrical pipe at the opposing position where the end surfaces of the pair of heat insulating members are positioned in a state of facing each other.
That is, a pair of adjacent ends of the heat insulating member are connected by a connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end surfaces of the heat insulating member divided into two parts facing each other. To do so, for example, the following procedure can be used.
First, a connecting member having a shape having a flat surface is engaged with each of the engaging portions formed at both ends of one side of a pair of semicircular heat insulating members divided into two.
After that, the heat insulating member on one side is attached to the outer peripheral portion of the cylindrical pipe, the connecting member having a shape having a flat surface being engaged with both ends thereof.
Subsequently, the heat insulating member on the other side is moved so as to approach the cylindrical pipe, and the heat insulating member on the other side is connected to the connection member having a flat surface that is engaged with both ends of the heat insulating member on the one side. The engaging portions formed at both ends of the members, that is, the engaging portions formed as recessed portions recessed from the end faces in the tangential direction of the cylindrical tube, are positioned with the end faces of the pair of heat insulating members facing each other. It is engaged while being moved in the tangential direction of the cylindrical tube at the opposing location.
In such a procedure, a pair of adjacent heat insulating member end portions are connected to the connecting member at each of the two opposing locations located in the circumferential direction of the cylindrical tube with the end faces of the two divided heat insulating members facing each other. By connecting them together, even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical tube, the connecting member can be attached.
Moreover, in a state in which the connecting member having a shape having a flat surface is engaged with the engaging portion formed as a recessed portion recessed from the end face in the tangential direction of the cylindrical pipe, for example, the heat insulating member is placed on one side. Each of the inner surface and the outer surface formed on a flat surface aligned along the radial direction of the cylindrical tube of the recessed portion and along the tangential direction of the cylindrical tube , the flat surface along the inner and outer surfaces of the recessed portion of the connecting member having a flat surface contacts, and the rotational movement is prevented, etc., so that the connection of the shape having a flat surface The engagement between the member and the engagement portion becomes difficult to disengage.
In short, according to the cylindrical pipe heat insulating structure of the present invention, the connecting member can be engaged with the heat insulating member even if there is no space corresponding to the length of the connecting member on one side of the heat insulating member in the axial direction of the cylindrical pipe. It can be attached in a state where it is difficult to remove.
In addition, a slit separating the engaging portions in the radial direction of the cylindrical tube is formed in each of the pair of engaging portions that engage with the adjacent recessed portions of the connection member formed in a shape having a flat surface. Therefore, one engaging portion of the pair of engaging portions in the connecting member is engaged with the engaging portion of the heat insulating member to be mounted first of the pair of heat insulating members, or the engaging portion of the pair of heat insulating members is mounted after It is possible to satisfactorily engage the engaging portion of the heat insulating member to be attached with the remaining engaging portion of the pair of engaging portions of the connecting member.
That is, when the engaging portion formed with the slit is pressed so as to be sandwiched in the radial direction, the formation of the slit can reduce the width of the cylindrical tube along the radial direction. The engaging portion of the heat insulating member is preferably engaged with the engaging portion where the slit is formed while elastically deforming the engaging portion formed with the slit so as to reduce the width along the radial direction of the cylindrical tube. be able to.
By the way, by making the width along the radial direction of the cylindrical tube of the engaging portion where the slit is formed slightly larger than the width between the inner surface and the outer surface of the concave portion forming the engaging portion, , when the engaging portion of the heat insulating member is engaged with the engaging portion in which the slit is formed, the engagement in which the slit is formed with the inner side surface and the outer side surface of the recessed portion forming the engaging portion The contact pressure with the part can be increased to make it difficult to come off.
In short, according to the characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention, it is possible to satisfactorily engage the engaging portion of the heat insulating member with the pair of engaging portions of the connecting member.

A further characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention is that the connection member formed in a shape having a flat surface is made of an elastically deformable material, and engages with the adjacent concave portion of the connection member. A slit is formed in the engaging portion on one side of the pair of engaging portions to separate the engaging portions in the radial direction of the cylindrical tube.

That is, a slit that separates the engaging portions in the radial direction of the cylindrical tube is provided on one side of a pair of engaging portions that engage adjacent recessed portions in the connection member formed in a shape having a flat surface. is formed, for example, the engaging portion of the pair of engaging portions of the connecting member where the slit is not formed is engaged with the engaging portion of the heat insulating member to be mounted first of the pair of heat insulating members. so that the engaging portion of one of the pair of heat insulating members to be mounted later is engaged with the engaging portion of the pair of engaging portions of the connecting member in which the slit is formed. By doing so, the engaging portion can be engaged with the engaging portion while elastically deforming the engaging portion in which the slit is formed.

That is, when the engaging portion formed with the slit is pressed so as to be sandwiched in the radial direction, the formation of the slit can reduce the width of the cylindrical tube along the radial direction. The engaging portion of the heat insulating member is preferably engaged with the engaging portion where the slit is formed while elastically deforming the engaging portion formed with the slit so as to reduce the width along the radial direction of the cylindrical tube. be able to.

Incidentally, the width along the radial direction of the cylindrical tube of the engaging portion where the slit is formed should be slightly larger than the width between the inner and outer surfaces of the recess forming the engaging portion. Therefore, when the engaging portion of the heat insulating member is engaged with the engaging portion in which the slit is formed, the inner surface and the outer surface of the recessed portion forming the engaging portion are engaged with the engaging portion in which the slit is formed. By increasing the contact pressure with the mating portion, it is possible to make it difficult to come off.

In short, according to a further characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention, the slit of the pair of engaging portions of the connecting member forms the engaging portion of the heat insulating member to be mounted later among the pair of heat insulating members. It is possible to satisfactorily engage with the engaging portion that is already engaged.

A further characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention is that the connection member formed in a shape having a flat surface is made of an elastically deformable material, and engages with the adjacent concave portion of the connection member. A slit is formed in each of the pair of engaging portions to separate the engaging portions in the radial direction of the cylindrical tube.

That is, a pair of engaging portions of the connecting member formed in a shape having a flat surface, which engage with the adjacent recessed portions, are each formed with a slit separating the engaging portions in the radial direction of the cylindrical tube. Therefore, one engaging portion of the pair of engaging portions in the connecting member is engaged with the engaging portion of the heat insulating member to be mounted first of the pair of heat insulating members, or the engaging portion of the pair of heat insulating members is mounted after It is possible to satisfactorily engage the engaging portion of the heat insulating member to be attached with the remaining engaging portion of the pair of engaging portions of the connecting member.

That is, when the engaging portion formed with the slit is pressed so as to be sandwiched in the radial direction, the formation of the slit can reduce the width of the cylindrical tube along the radial direction. The engaging portion of the heat insulating member is preferably engaged with the engaging portion where the slit is formed while elastically deforming the engaging portion formed with the slit so as to reduce the width along the radial direction of the cylindrical tube. be able to.

By the way, by making the width along the radial direction of the cylindrical tube of the engaging portion where the slit is formed slightly larger than the width between the inner surface and the outer surface of the concave portion forming the engaging portion, , when the engaging portion of the heat insulating member is engaged with the engaging portion in which the slit is formed, the engagement in which the slit is formed with the inner side surface and the outer side surface of the recessed portion forming the engaging portion The contact pressure with the part can be increased to make it difficult to come off.

In short, according to the further characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention, it is possible to satisfactorily engage the engaging portion of the heat insulating member with the pair of engaging portions of the connecting member.

A further characteristic configuration of the heat insulating structure for a cylindrical pipe according to the present invention is that a plurality of heat insulating members having a cylindrical shape and different diameters are formed on the outer peripheral portion of the cylindrical pipe by the semicircular heat insulating member divided into two. The wall is provided in a state of forming a plurality of layers.

That is, since the outer peripheral portion of the cylindrical pipe is covered with a plurality of heat insulating walls provided in a state of forming a plurality of layers, the cylindrical pipe can be appropriately insulated.

In short, according to the further characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention, the cylindrical pipe can be appropriately insulated.

A further characteristic configuration of the heat insulating structure for a cylindrical pipe according to the present invention is adjacent in the axial direction of the cylindrical pipe to an installation location of the semicircular heat insulating member connected by the connecting member on the outer peripheral portion of the cylindrical pipe. A pair of arc-shaped heat insulating members divided in the circumferential direction of the cylindrical tube are arranged in adjacent pairs at each of a plurality of opposing points located in the circumferential direction of the cylindrical tube with their end faces facing each other. provided in a state in which the ends of the heat insulating member are connected by a long connecting member along the axial direction of the cylindrical tube,
A recessed groove recessed from the end face in the circumferential direction of the cylindrical tube is provided as an engaging groove of the connecting member in each of the pair of ends of the heat insulating member connected by the connecting member. is formed in a configuration in which a locking groove recessed radially outward of the cylindrical tube is provided on the radially outer side of the cylindrical tube,
The connecting member has a cross-sectional shape including a body connecting portion that engages with the recessed grooves of the pair of ends of the heat insulating member, and a pair of locking connecting portions that engage with the locking grooves. It is at the point where it is formed.

That is, when a heat insulating member having a predetermined length in the axial direction of the cylindrical pipe is sequentially mounted from one end to the other end of the cylindrical pipe, the portion adjacent to the one end of the cylindrical pipe or the portion of the cylindrical pipe At the point away from the other end, an arc-shaped heat insulating member connected by a connecting member is attached, and finally, at the point adjacent to the other end of the cylindrical tube, it is connected by a connecting member. By attaching the semicircular heat insulating member, the heat insulating member can be appropriately attached over the entire length of the cylindrical pipe.

By the way, in order to attach an arc-shaped heat insulating member connected by a long connecting member to the outer periphery of a cylindrical pipe, the arc-shaped heat insulating members divided in the circumferential direction of the cylindrical pipe are attached to each other. In a state in which the cylindrical pipes are arranged in the circumferential direction in a combined state, the long connecting members are moved in the longitudinal direction and engaged (inserted) into the engaging grooves formed in the ends of the adjacent heat insulating members. Therefore, a heat insulating member is attached.

As the engagement grooves formed at the ends of the heat insulating member connected by the connecting member, recessed grooves recessed in the circumferential direction of the cylindrical pipe from the end surface of the heat insulating member are formed in the cylindrical tube of the recessed grooves. The radially outer side portion of the pipe is formed in a form having a locking groove recessed radially outwardly of the cylindrical pipe. Since it is formed in a form provided with a body connecting portion that engages with the recessed groove portion and a pair of locking connecting portions that engage with the locking groove portion, the locking groove portion is locked by the locking connecting portion. As a result, since the adjacent heat insulating members can be connected appropriately, when the heat insulating member is cooled by the low-temperature fluid flowing inside the cylindrical pipe, the heat shrinkage of the heat insulating member causes the gap between the end faces of the adjacent cross-sectional members. It is possible to suppress the appearance of a large gap in the cylindrical pipe and appropriately insulate the cylindrical pipe.

In short, according to the further characteristic configuration of the cylindrical pipe heat insulating structure of the present invention, the heat insulating member can be appropriately mounted over the entire length of the cylindrical pipe in a state in which the cylindrical pipe can be properly insulated.

A further characteristic configuration of the heat insulating structure for a cylindrical pipe of the present invention is formed in a cylindrical shape with different diameters by a plurality of arc-shaped heat insulating members connected to the outer peripheral portion of the cylindrical pipe by the connecting member. A plurality of heat insulating wall portions are provided in a state of forming a plurality of layers.

That is, a plurality of heat insulating wall portions formed in a cylindrical shape with different diameters by arc-shaped heat insulating members connected by a connecting member form a plurality of layers on the outer peripheral portion of the cylindrical pipe. Because it is provided, the cylindrical tube can be better insulated.

In short, according to the further characteristic configuration of the heat insulating structure for cylindrical pipes of the present invention, the cylindrical pipe can be insulated more appropriately.

[Fig. 2] is a vertical cross-sectional view showing a mounted state of a heat insulating member. [FIG. 2] is a cutaway perspective view showing a mounted state of a heat insulating member and a semicircular heat insulating member. 1 is a view taken along line III-III in FIG. 1; FIG. 2 is a view taken along line IV-IV in FIG. 1; FIG. [FIG. 2] is an exploded perspective view showing the relationship between a connecting member and a heat insulating member; [FIG. 2] is a front view showing the relationship between a connecting member and a semicircular heat insulating member; 1] is a perspective view of a connecting member. [FIG. [Fig. 2] is a perspective view showing a mounting form of a connecting body. 1] is an enlarged perspective view of a connecting body. [FIG. [Fig. 10] is a front view showing a mounting form of the semicircular heat insulating material of the second embodiment. [Fig. 10] is a perspective view showing a connecting member of a second embodiment; [Fig. 10] is a front view showing a mounting form of the heat insulating member of the third embodiment. [Fig. 10] is a front view showing the relationship between the semicircular heat insulating member and the connecting member of the third embodiment; [Fig. 10] is a front view showing a mounting configuration of the semicircular heat insulating member of the third embodiment. [FIG. 12] is a perspective view showing a connecting member of a third embodiment; [FIG. 12] is a front view showing a mounting configuration of a semicircular heat insulating member according to a fourth embodiment; [ Fig. 10] Fig. 10 is a front view showing a mounting form of a heat insulating member of a comparative example. [ Fig. 10] Fig. 10 is an exploded perspective view showing a mounting form of a heat insulating member of a comparative example.

[First embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.
(Overall configuration of heat insulating structure)
As shown in FIGS. 1 and 2, a cylindrical pipe 1 through which a low-temperature fluid such as LNG or LPG flows is provided, and a plurality of heat insulating members made of urethane foam formed by foaming urethane resin are provided on the outer peripheral portion of the cylindrical pipe 1. P are mounted in a state of being aligned in the circumferential direction and the axial direction of the cylindrical tube 1 .

The plurality of heat insulating members P extend in an arc shape (semicircular shape in this embodiment) along the circumferential direction of the cylindrical pipe 1 while having a constant thickness in the radial direction of the cylindrical pipe 1. A long base material having a long axial length is cut into a predetermined length in the axial direction of the cylindrical tube 1 .
As shown in FIG. 5, in the following description, the surface on the radially outer side of the heat insulating member P is defined as an outer surface 3, the surface on the radially inner side is defined as an inner surface 4, and the surfaces at both ends in the circumferential direction are defined as end surfaces. 5, and side surfaces 6 on both sides in the axial direction.

In this embodiment, the heat insulating member P is mounted so as to form a three-layer heat insulating wall.
That is, as the heat insulating member P, a large heat insulating member PL having the largest diameter, an intermediate heat insulating member PM having an intermediate diameter, and a small heat insulating member PS having the smallest diameter are provided (see FIGS. 3 and 4).
Incidentally, when the heat insulating members P are stacked, the outer surface 3 of the large-diameter heat insulating member PL is positioned on the outermost side, and the inner surface 4 of the large-diameter heat insulating member PL and the outer surface 3 of the intermediate-diameter heat insulating member PM have the same diameter. The inner surface 4 of the intermediate-diameter heat insulating member PM and the outer surface 3 of the small-diameter heat-insulating member PS are arranged in the same diameter, and the inner surface 4 of the small-diameter heat-insulating member PS is arranged in the same diameter as the outer peripheral surface of the cylindrical pipe 1. become.

Both ends of the cylindrical pipe 1 are provided with flanges F, and the flanges F of the adjacent cylindrical pipes 1 are connected with bolts to form a flow path for flowing the low-temperature fluid.
The plurality of heat insulating members P are sequentially mounted from one end to the other end of the cylindrical pipe 1, and are adjacent to one end of the cylindrical pipe 1, adjacent to the other end of the cylindrical pipe 1, And it will be attached to a location corresponding to between them.

The form in which the heat insulating members P are arranged in the axial direction of the cylindrical tube 1 is the same as the form in which the small diameter heat insulating member PS with the smallest diameter is arranged and the form in which the large diameter heat insulating member PL with the largest diameter is arranged. The form in which the intermediate-diameter heat insulating members PM are arranged is different.
That is, the small-diameter heat insulating member PS, the intermediate-diameter heat insulating member PM, and the large-diameter heat insulating member PL are formed so that the length along the axial direction of the cylindrical tube 1 becomes a basic length (for example, 1 m).

As for the small-diameter heat-insulating member PS and the large-diameter heat-insulating member PL, the heat-insulating member P having a basic length is arranged from one end to the other end of the cylindrical tube 1, while the intermediate-diameter heat-insulating member PM is: After arranging the insulating member P of half the basic length (for example, 0.5 m) at one end of the cylindrical tube 1, the insulating member P of the basic length is arranged toward the other end of the cylindrical tube 1. configured to line up.

At a location adjacent to the other end of the cylindrical pipe 1, the axial lengths of the small-diameter heat insulating member PS, intermediate-diameter heat insulating member PM, and large-diameter heat insulating member PL are equal to the axial length of the cylindrical pipe 1. It will be determined accordingly.
However, the axial lengths of the small-diameter heat insulating member PS, intermediate-diameter heat-insulating member PM, and large-diameter heat-insulating member PL, which are mounted at locations adjacent to the other end of the cylindrical pipe 1, are equal to the space for mounting the connecting member 7 described later. is configured to be 1 m or longer in order to form a

In addition, regarding the intermediate-diameter heat insulating member PM, since the intermediate-diameter heat insulating member PM having a length of half the basic length (for example, 0.5 m) is installed at a location adjacent to one end of the cylindrical pipe 1, the cylindrical pipe 1 , the axial length of the small-diameter heat insulating member PS and the large-diameter heat insulating member PL differs from the axial length of the intermediate-diameter heat insulating member PM.
In this embodiment, the axial length of the intermediate-diameter heat insulating member PM is half the basic length (for example, 0.5 m) of the axial lengths of the small-diameter heat-insulating member PS and the large-diameter heat insulating member PL. length plus the length of

Furthermore, at an intermediate position excluding a position adjacent to one end of the cylindrical pipe 1 and a position adjacent to the other end of the cylindrical pipe 1, the heat insulating members P are arranged side by side in the circumferential direction of the cylindrical pipe 1 (hereinafter referred to as basic However, the configuration in which the heat insulating members P are arranged in the circumferential direction of the cylindrical pipe 1 at a location adjacent to the other end of the cylindrical pipe 1 (hereinafter abbreviated as the end mounting structure) is As opposed to the basic mounting configuration, the basic mounting configuration and the end mounting configuration will now be described sequentially.

Incidentally, the portion between the flange F of the cylindrical pipe 1 and the heat insulating member P is filled with a heat insulating material D such as glass wool, and the portion corresponding to the upper portion of the flange F of the cylindrical pipe 1 has a basic mounting configuration In the same configuration as , arc-shaped flange heat insulating members Q are installed in two layers.

(basic mounting configuration)
In the basic mounting configuration, as shown in FIG. 3, a plurality of arcuate (semicircular in this embodiment) heat insulating members P divided in the circumferential direction of the cylindrical tube 1 are arranged with their end faces facing each other. At each of a plurality of opposing locations located in the circumferential direction of the cylindrical tube 1, a pair of adjacent ends of the heat insulating member are connected along the axial direction of the cylindrical tube by a long connecting member 7 (see FIG. 5). It is provided on the outer peripheral portion of the cylindrical tube 1 in a state.
Incidentally, the length of the connecting member 7 is formed to be the same length as the length of the heat insulating member P in the axial direction, and like the heat insulating member P, the connecting member 7 is made of urethane resin.

As shown in FIGS. 3 and 5, each of the ends of a pair of heat insulating members connected by the connecting member 7 is recessed from the end face in the circumferential direction of the cylindrical tube as an engaging groove portion U of the connecting member 7. The recessed groove portion 8 is formed to have a locking groove portion 8a recessed radially outwardly of the cylindrical pipe 1 on the radially outer side portion of the cylindrical pipe 1 of the recessed groove portion 8 .

The connecting member 7 has a main body connecting portion 7A that engages with the recessed groove portions 8 of the pair of ends of the heat insulating member and a pair of locking connecting portions 7a that engages with the locking groove portion 8a. It is formed in a form of provision.

Therefore, in the basic mounting configuration, the semicircular heat insulating member P is arranged on the outer peripheral portion of the cylindrical pipe 1 in the circumferential direction of the cylindrical pipe 1, and the connecting member 7 is moved in the longitudinal direction (the axial direction of the cylindrical pipe 1). ), the heat insulating member P is attached to the outer peripheral portion of the cylindrical tube 1 by inserting the pair of heat insulating member ends in such a manner that they are engaged with the recessed grooves 8 (FIG. 5). reference).

Specifically, first, the small-diameter heat insulating member PS is attached to the outer peripheral surface of the cylindrical pipe 1, then the intermediate-diameter heat insulating member PM is attached to the outer peripheral surface of the small-diameter heat insulating member PS, and finally the large-diameter heat insulating member PL is attached. , is mounted on the outer peripheral surface of the intermediate-diameter heat insulating member PM.
In this way, when the small-diameter heat insulating member PS, the intermediate-diameter heat insulating member PM, and the large-diameter heat insulating member PL are mounted, a plurality of arc-shaped (two A plurality of (three) heat insulating wall portions formed in a cylindrical shape with different diameters from the heat insulating member P (semicircular) are provided in a state of forming a plurality of layers.

In addition, the phases in the circumferential direction of the cylindrical tube 1 must be different by 90 degrees between the facing portions of the small-diameter heat insulating member PS where the end faces face each other and the facing positions of the intermediate-diameter heat insulating member PM where the end faces face each other. Similarly, the opposing portions of the intermediate-diameter heat insulating member PM with their end faces facing each other and the opposing portions of the large-diameter heat insulating member PL with their end faces facing each other have phases in the circumferential direction of the cylindrical pipe 1. are different by 90 degrees, and a small-diameter heat insulating member PS, an intermediate-diameter heat insulating member PM, and a large-diameter heat insulating member PL are mounted.

(end-mounted configuration)
In the end mounting configuration, as shown in FIG. 4, the semicircular heat insulating member P, which is divided into two in the circumferential direction of the cylindrical tube 1, is divided into two semicircular portions in the circumferential direction of the cylindrical tube 1. It will be used as a heat insulating member PA.
Then, in each of the two opposing locations where the heat insulating member P is located in the circumferential direction of the cylindrical tube 1 with the end faces facing each other, the end portions of the adjacent pair of heat insulating members are extended along the axial direction of the cylindrical tube. It is provided on the outer peripheral portion of the cylindrical tube 1 in a state of being connected by a long connecting member B. As shown in FIG.
Incidentally, the connecting member B is formed to have the same length as the heat insulating member P in the axial direction, and the connecting member B, like the heat insulating member P, is made of urethane resin.

Recessed portions recessed along the tangential direction of the cylindrical tube 1 from the end surface 5 as groove-shaped engaging portions V with which the connection member B engages with the pair of ends of the heat insulating member at the two opposing locations. 10 is formed such that an inner surface 10u and an outer surface 10g, which are arranged along the radial direction of the cylindrical tube 1, are flat surfaces along the tangential direction of the cylindrical tube 1, respectively.
Incidentally, the tangential direction of the cylindrical pipe 1 in this description means the tangential direction of the cylindrical pipe 1 at the opposing position where the end faces 5 of the pair of heat insulating members P are placed in contact with each other.

6, the recessed portion 10 is formed by cutting out a lateral side portion 8b positioned laterally of the locking groove portion 8a in the recessed groove portion 8 in the basic mounting configuration. .
That is, in the present embodiment, the heat insulating member P having the recessed groove portion 8 is formed. In the basic mounting configuration, the heat insulating member P is used as it is. A rectangular recessed portion 10 is formed by cutting a lateral portion 8b located laterally of the locking groove portion 8a, and the heat insulating member P having the recessed portion 10 thus formed is formed into a semicircular heat insulating member. It will be used as PA.

Then, the connecting members B at the two opposing locations are formed to have square cross-sectional shapes having flat surfaces along the inner surface 10u and the outer surface 10g of the recessed portions 10 of the pair of end portions of the heat insulating members. It is configured as an elongated rectangular body 11 .
Incidentally, since the corners of the square-shaped recessed portion 10 are formed in an arc shape, the cross-sectional shape of the elongated square body 11 is, in detail, a square shape with rounded corners.

Further, in the present embodiment, the elongated rectangular body 11 having a rectangular cross-sectional shape is formed of an elastically deformable material (urethane resin). As shown in FIG. 7, slits 12 are formed in each of the pair of engaging portions 11A for separating the engaging portions 11A in the radial direction of the cylindrical tube.
Incidentally, the long rectangular body 11 has a thickness of about 15 mm, and the slit 12 is formed with a width of about 2 mm.

Therefore, in the end mounting configuration, the heat insulating member P is mounted on the outer circumference of the cylindrical tube 1 by the following procedure.
First, a pair of semicircular heat insulating members P (semicircular heat insulating members PA) divided into two are provided with recessed portions 10 formed at both ends of one of the heat insulating members P (semicircular heat insulating members PA). 11.
Incidentally, when the elongated rectangular body 11 is engaged with the recessed portion 10, the elongated rectangular body 11 is engaged (inserted) into the recessed portion 10 while being moved in the longitudinal direction. is moved in the recessing direction of the recessed portion 10 to engage with the recessed portion 10 .

After that, the heat insulating member P (semicircular heat insulating member PA) on one side with which the elongated rectangular body 11 is engaged is attached to the outer peripheral portion of the cylindrical tube 1 in a state of being abutted thereon.
Subsequently, the heat insulating member P on the other side is moved so as to approach the cylindrical tube 1, and the heat insulating member P on the other side is moved to the long rectangular body 11 engaged with both ends of the heat insulating member P on the one side. The recesses 10 formed at both ends of the member P are moved in the tangential direction of the cylindrical tube 1 at the opposite positions where the end faces 5 of the pair of heat insulating members P are mated to engage with each other.

Specifically, first, the small-diameter heat insulating member PS is attached to the outer peripheral surface of the cylindrical pipe 1, then the intermediate-diameter heat insulating member PM is attached to the outer peripheral surface of the small-diameter heat insulating member PS, and finally the large-diameter heat insulating member PL is attached. , is mounted on the outer peripheral surface of the intermediate-diameter heat insulating member PM.
In this way, when the small-diameter heat insulating member PS, the intermediate-diameter heat insulating member PM, and the large-diameter heat insulating member PL are mounted, a semicircular heat insulating member P (semicircular A plurality of (three) heat insulating walls formed in a state of being cylindrical and having different diameters in the heat insulating member PA) are provided in a state of forming a plurality of layers.

Further, as in the basic mounting configuration, the opposing portions of the small-diameter heat insulating member PS with their end faces facing each other and the opposing portions of the intermediate-diameter heat insulating member PM with their end faces facing each other are positioned around the cylindrical pipe 1. The phases in the directions are made to differ from each other by 90 degrees. A small-diameter heat insulating member PS, an intermediate-diameter heat insulating member PM, and a large-diameter heat insulating member PL are mounted in a form in which the phases in the circumferential direction of the cylindrical pipe 1 are different from each other by 90 degrees.

(Regarding insulation reinforcement configuration)
In this embodiment, a heat insulation reinforcing structure is provided to reinforce heat insulation between a plurality of heat insulating members P attached to the outer peripheral surface of the cylindrical tube 1, that is, between adjacent heat insulating members P. As shown in FIG.
That is, the plurality of heat insulating members P attached to the outer peripheral surface of the cylindrical pipe 1 are cooled and shrunk by the low-temperature fluid flowing inside the cylindrical pipe 1. As a result, the adjacent heat insulating members P Since there is a risk that a gap will be formed between them and the insulation performance will deteriorate, a heat insulation reinforcing structure is provided to reinforce the insulation performance.

The heat insulation reinforcement structure is provided for the heat insulation wall formed by the small diameter heat insulation member PS and the intermediate diameter heat insulation member PM, and for the heat insulation wall formed by the large diameter heat insulation member PL. The inner side reinforcing structure and the outer side reinforcing structure will be sequentially described below. 1 to 6, illustration of the heat insulating reinforcing structure is omitted.

(inner side reinforcement configuration)
As shown in FIG. 8, the inner side reinforcing structure is applied to a portion where the end faces 5 of a pair of heat insulating members P arranged in the circumferential direction of the cylindrical tube 1 are placed in contact with each other. A tape (moisture-proof butyl tape) 13 is attached, and a pair of hooks are attached to the adjacent heat insulating members P in the portion where the side surfaces 6 of the heat insulating members P arranged in the axial direction of the cylindrical tube 1 are placed against each other. It is configured to mount a connecting body W having a stop portion Wa.

A description will be given of the structure in which the connecting body W is attached to the adjacent heat insulating member P. The connecting body W provided with the pair of locking portions Wa is arranged adjacent to the axial direction of the cylindrical tube 1 as a pair of small diameter The heat insulating member PS and the pair of intermediate-diameter heat insulating members PM arranged adjacent to each other are inserted radially inwardly of the cylindrical tube 1 separately.
The pair of small-diameter heat insulating members PS and the pair of intermediate-diameter heat insulating members PM arranged adjacent to each other in the axial direction of the cylindrical pipe 1 are formed in a plurality of layers (three layers) on the outer peripheral portion of the cylindrical pipe 1. A pair of heat insulating members P which form an inner heat insulating wall in the radial direction of the cylindrical pipe 1 and are arranged adjacent to each other in the axial direction of the cylindrical pipe 1 among the heat insulating walls.

In the present embodiment, as shown in FIG. 9, the connecting body W is provided with locking portions Wa at both ends in the width direction of the bendable belt-shaped member 14, and the connecting body W includes a pair of It is mounted in a state of being wrapped around the outer surface of the heat insulating member P.
That is, the belt-like member 14 is made of, for example, a tarpaulin, which is a vinyl-based material in which a polyester fiber fabric is sandwiched between soft synthetic resin films, and the belt-like member 14 is made of synthetic resin and formed into a sharp locking structure. Part Wa is attached.

Therefore, since the belt-shaped member 14 has no adhesiveness, after the belt-shaped member 14 is wound around the outer surface portion of the pair of heat insulating members P, the narrow tape 15 having adhesiveness is wound around the wound belt-shaped member 14 to obtain the belt-shaped member. 14 is configured to suppress detachment.

(outer side reinforcement configuration)
As shown in FIG. 8, the outer side reinforcing structure is a strip-shaped first leakage prevention body having adhesiveness in a state of straddling a pair of large-diameter heat insulating members PL arranged adjacent to each other in the axial direction of the cylindrical tube 1. 16 are adhered, and at each of a plurality (two) of opposing locations where end faces 5 of a plurality (two) of large-diameter heat insulating members PL aligned in the circumferential direction of the cylindrical tube 1 are aligned with each other, the cylindrical tube In this configuration, a second adhesive belt-like leak prevention member 17 is adhered so as to straddle a pair of large-diameter heat insulating members PL that are adjacent to each other in the circumferential direction.

Incidentally, as is clear from the above description, the heat insulating wall formed by the large-diameter heat insulating member PL corresponds to the outermost heat insulating wall in the radial direction of the cylindrical tube 1 among the plurality (three) of heat insulating walls. It will be.

Furthermore, in the present embodiment, the third leak-preventing body 18 having stickiness is adhered to the entire outer peripheral surface of the large-diameter heat insulating member PL to improve the heat insulating performance.
The first leak-preventing body 16, the second leak-preventing body 17, and the third leak-preventing body 18 are, for example, a rubber-based material having excellent adhesion to a support made of aluminum foil and glass cloth bonded together. It is configured using a tape (ALGC tape) to which an adhesive is applied.

Incidentally, as for the order of adhering the first leak-preventing body 16, the second leak-preventing body 17, and the third leak-preventing body 18, the third leak-preventing body 18 is first adhered, and then the third leak preventive body 18 is adhered. First, the second leak-preventing member 17 is attached, and finally the first leak-preventing member 16 is attached.

[Second embodiment]
Next, a second embodiment will be described. This second embodiment differs from the first embodiment in the form of the slits 12 formed in the elongated rectangular body 11, and the rest of the configuration is the same as that of the first embodiment. Since it is the same as the embodiment, only the parts different from the first embodiment will be explained, and the explanation of the same configuration as the first embodiment will be omitted.

As shown in FIGS. 10 and 11, in the second embodiment, only one of the pair of engaging portions 11A of the elongated rectangular body 11 is provided with a cylindrical tube at the engaging portion 11A. 1 radially separating slits 12 are formed.
That is, in the first embodiment, the slits 12 are formed in each of the pair of engaging portions 11A of the long rectangular body 11, but in the second embodiment, one side of the pair of engaging portions 11A is formed. The difference from the first embodiment is that the slit 12 is formed only in the engaging portion 11A.

In the second embodiment, first, of a pair of semicircular heat insulating members P (semicircular heat insulating member PA) divided into two, recessed portions 10 are formed at both ends of one heat insulating member P. , the engaging portion 11A in which the slit 12 is not formed is engaged when the elongated rectangular body 11 is engaged.
Incidentally, when the elongated rectangular body 11 is engaged with the recessed portion 10, the elongated rectangular body 11 is engaged (inserted) into the recessed portion 10 while being moved in the longitudinal direction. is moved in the recessing direction of the recessed portion 10 to engage with the recessed portion 10 .

After that, the heat insulating member P on one side, with which the elongated rectangular body 11 is engaged, is attached to the outer peripheral portion of the cylindrical tube 1 in such a state as to be brought into contact therewith.
Subsequently, the heat insulating member P on the other side is moved so as to approach the cylindrical tube 1, and the slits 12 are formed in the elongated rectangular body 11 engaged with both ends of the heat insulating member P on the one side. The recessed portions 10 formed at both ends of the heat insulating member P on the other side with respect to the engaging portion 11A are positioned in a state where the end surfaces 5 of the pair of heat insulating members P face each other. Engage while moving in the tangential direction.

[Third embodiment]
Next, a third embodiment will be described. This third embodiment differs from the first embodiment in the configuration of the connecting member B in the end-mounted configuration, and the rest of the configuration is different from the first embodiment. Since it is the same, the parts different from the first embodiment will be explained, and the explanation of the same configuration as the first embodiment will be omitted.

In the above-described first embodiment, the outer diameter of the cylindrical tube 1 is about 30 mm, whereas in the third embodiment, the outer diameter of the cylindrical tube 1 is about 300 mm. A member P is formed in an arc shape of 90 degrees.

In the basic mounting configuration of the third embodiment, as shown in FIG. 12, as in the first embodiment, the heat insulating member P is connected by the connecting member 7, and a plurality of layers (three layers) are provided. It is mounted to form an insulating wall.

13 and 14, the semicircular heat insulating member PA, which is divided into two in the circumferential direction of the cylindrical tube 1, is formed in the shape of an arc of 90 degrees. The two heat insulating members P are connected by the connecting member 7 used in the basic mounting configuration.

That is, the semicircular heat insulating member PA, which is divided into two in the circumferential direction of the cylindrical pipe, has a pair of adjacent heat insulating members at each of the two opposing locations located in the circumferential direction of the cylindrical pipe 1 with the end faces facing each other. The member ends are provided in a state of being connected by a long connecting member B along the axial direction of the cylindrical tube 1 .

A groove-shaped engaging portion V with which the connection member B engages is formed on each of the pair of end portions of the heat insulating member at one of the two opposing portions as described above. A rectangular cut portion 20 obtained by cutting the inner side portion of the cylindrical pipe 1 along the circumferential direction is provided on the radially outer side of the cylindrical pipe 1 of the cut portion 20 radially outward of the cylindrical pipe 1 It is formed in a form provided with recessed engagement recesses 20a.

In addition, the groove-shaped engaging portion V with which the connecting member B engages with the pair of end portions of the heat insulating member at the other side of the two opposing locations is provided in the same manner as in the above-described first embodiment. , the recessed portion 10 recessed from the end surface 5 along the tangential direction of the cylindrical tube 1 flattens each of the inner surface 10u and the outer surface 10g aligned along the radial direction of the cylindrical tube 1 along the tangential direction of the cylindrical tube 1. It is formed in the form of a surface.
Incidentally, the tangential direction of the cylindrical pipe 1 in this description means the tangential direction of the cylindrical pipe 1 at the opposing position where the end faces 5 of the pair of heat insulating members P are placed in contact with each other.

As shown by the phantom line in FIG. 13, the rectangular cutout portion 20 cuts the lower side portion 8c positioned below the recessed groove portion 8 (inner side in the radial direction of the cylindrical tube 1) in the basic mounting configuration. By doing so, it is formed in a form in which the locking groove portion 8a is used as the locking concave portion 20a.
Further, as shown by the phantom line in FIG. 13, the recessed portion 10 is a lateral portion of the recessed groove portion 8 in the basic mounting configuration located laterally of the locking groove portion 8a, as in the first embodiment described above. It is formed by excising 8b.

In other words, in the present embodiment, the heat insulating member P is formed with the recessed groove portion 8, and the heat insulating member P is used as it is in the basic mounting configuration.
In the end mounting configuration, the lower side portion 8c positioned below the recessed groove portion 8 positioned at the end of one of the pair of heat insulating members P connected by the connecting member 7. is cut off to form a cut portion 20, and the lateral side portion 8b located on the lateral side of the locking groove portion 8a in the recessed groove portion 8 located at the end portion of the heat insulating member P on the other side is cut off. A pair of heat insulating members P in which the shaped recessed portion 10 is formed and the cutout portion 20 and the recessed portion 10 thus formed are used as the semicircular heat insulating member PA.

As shown in FIG. 15, the connecting member B at one side of the two opposing portions has a rectangular cross-sectional shape that engages with the rectangular cutout portions 20 of the pair of ends of the heat insulating members. An elongated M-shaped member 21 having an M-shaped cross-section is formed to include a main body portion 21A and a pair of locking projections 21a that engage with the locking concave portion 20a.

In addition, the connecting member B at the other side of the two facing locations has a cross-sectional shape that corresponds to the inner surface 10u and the outer surface 10g of the recessed portion 10 of the pair of heat insulating member ends, as in the first embodiment. It is configured as an elongated rectangular body 11 formed in a rectangular shape having a flat surface along it.

In this third embodiment, a pair of adjacent heat insulating members are placed at two opposing locations located in the circumferential direction of the cylindrical pipe 1 with the end faces of the semicircular heat insulating member PA divided into two parts facing each other. In order to connect the ends with the connecting member B, the following procedure is performed.
First, the long M-shaped member 21 and the long rectangular body are attached to the engaging portions V formed at both ends of the semicircular heat insulating member PA on one side of the pair of semicircular heat insulating members PA divided into two. 11.
That is, the elongated M-shaped member 21 is engaged with the engagement portion V formed as the rectangular cutout portion 20 having the locking recess 20a, and the elongated rectangular body 11 is moved from the end face in the tangential direction of the cylindrical tube. It engages with an engaging portion V formed as a recessed portion 10 recessed into.

After that, the semicircular heat insulating member PA on one side with which the elongated M-shaped member 21 and the elongated rectangular body 11 are engaged is attached to the outer peripheral portion of the cylindrical tube 1 in a state of contact therewith.
Next, first, as an engaging portion V formed on one end side of the semicircular heat insulating member PA on the other side with respect to the long M-shaped member 21, that is, as the cut portion 20 having the locking concave portion 20a, The formed engaging portion V is engaged while being moved from a position corresponding to the outside of the cylindrical tube 1 in a direction to approach the cylindrical tube 1 .

Next, the engaging portion V formed on the other end side of the semicircular heat insulating member PA on the other side with respect to the elongated rectangular body 11, that is, the end surface 5 is recessed in the tangential direction of the cylindrical tube 1. The engaging portion V formed as the recessed portion 10 is moved in the tangential direction of the cylindrical tube 1 at the opposite position where the end faces of the pair of semicircular heat insulating members PA face each other while being engaged. .

In such a procedure, a pair of adjacent heat insulating member ends are located at each of the two opposing locations located in the circumferential direction of the cylindrical tube 1 with the end surfaces of the semicircular heat insulating member PA divided into two parts facing each other. By connecting the parts with the connecting member B, the connecting member can be attached even if there is no space corresponding to the length of the connecting member B on one side of the cylindrical pipe 1 in the axial direction of the semicircular heat insulating member PA. It will be possible.

Incidentally, in the basic mounting configuration, when the connecting member 7 is removed and the heat insulating member P is disassembled for inspection of the cylindrical pipe 1, etc., there is a risk that the portion of the heat insulating member P where the recessed groove portion 8 is formed may be damaged. In such a case, the lower side portion 8c located on the lower side of the recessed groove portion 8 is cut to form a cut portion 20, and instead of the connecting member 7, a long M-shaped member 21 is used for heat insulation. You may make it connect the member P.

[Fourth Embodiment]
Next, a fourth embodiment will be described. This fourth embodiment differs from the third embodiment in the configuration of the connection member B in the end-mounted configuration, and the rest of the configuration differs from the third embodiment. Since it is the same, the different parts from the third embodiment will be explained, and the explanation of the same configuration as the third embodiment will be omitted.

That is, the semicircular heat insulating member PA, which is divided into two in the circumferential direction of the cylindrical tube 1, connects two heat insulating members P formed in an arc shape of 90 degrees with the connecting member 7 used in the basic mounting configuration. It is composed by
That is, the semicircular heat insulating member PA, which is divided into two in the circumferential direction of the cylindrical pipe, has a pair of adjacent heat insulating members at each of the two opposing locations located in the circumferential direction of the cylindrical pipe 1 with the end faces facing each other. The member P is provided in a state of being connected by a long connecting member B along the axial direction of the cylindrical tube 1 .

A groove-shaped engaging portion V with which the connection member B engages is formed on each of the pair of ends of the heat insulating member at the two opposing locations, and the inner portion of the end portion of the heat insulating member in the radial direction of the cylindrical tube 1 is formed. A rectangular cut portion 20 cut along the circumferential direction of the cylindrical pipe 1 is recessed radially outward of the cylindrical pipe 1 into the cut portion 20 on the radially outer side of the cylindrical pipe 1. It is formed in a form having a concave portion 20a.

In other words, in the present embodiment, the heat insulating member P is formed with the recessed groove portion 8, and the heat insulating member P is used as it is in the basic mounting configuration.
In the end-mounting configuration, the cutout portion 20 is formed by cutting the lower side portion 8c positioned below the recessed groove portion 8 positioned at both ends of the pair of heat insulating members P connected by the connecting member 7. Then, a pair of heat insulating members P having such cutout portions 20 are used as semicircular heat insulating members PA (see FIG. 13).

The connection members B at the two opposing locations are engaged with the engaging recesses 20a and the main body portion 21A having a rectangular cross-sectional shape that engages with the rectangular cutout portions 20 of the pair of ends of the heat insulating member. An elongated M-shaped member 21 having an M-shaped cross-section including a pair of locking protrusions 21a is formed (see FIG. 15).

In this fourth embodiment, a pair of adjacent heat insulating members are provided at each of the two opposing locations located in the circumferential direction of the cylindrical tube 1 with the end surfaces of the semicircular heat insulating member PA divided into two parts facing each other. In order to connect the ends with the connecting member B, the following procedure is performed.
First, the elongated M-shaped member 21 is engaged with each of the engaging portions V formed at both ends of the semicircular heat insulating member PA on one side of the pair of semicircular heat insulating members PA divided into two. do.
That is, the elongated M-shaped member 21 is engaged with the engagement portion V formed as a rectangular cut-out portion 20 having the locking recess 20a.

After that, the semicircular heat insulating member PA on one side, which is engaged with the long M-shaped member 21 , is mounted in contact with the outer peripheral portion of the cylindrical tube 1 .
Next, first, with respect to one of the pair of elongated M-shaped members 21, there is provided an engaging portion V formed on one end side of the semicircular heat insulating member PA on the other side, that is, an engaging concave portion 20a. The engaging portion V formed as a rectangular cut portion 20 is moved from a position corresponding to the outside of the cylindrical tube 1 in a direction of approaching the cylindrical tube 1 and engaged.

Next, with respect to the long M-shaped member 21 on the other side, an engaging portion V formed on the other end side of the semicircular heat insulating member PA on the other side, that is, a rectangular shape provided with the locking concave portion 20a The engaging portion V formed as the cut portion 20 of is moved from a position corresponding to the outside of the cylindrical tube 1 in a direction of approaching the cylindrical tube 1 and engaged.

Incidentally, when moving the engaging portion V formed on the other end side of the semicircular heat insulating member PA on the other side from a position corresponding to the outside of the cylindrical pipe 1 in a direction approaching the cylindrical pipe 1, , the semicircular heat insulating member PA on the other side is elastically deformed so as to expand and contract along the radial direction of the cylindrical pipe 1 .

In such a procedure, a pair of adjacent heat insulating member ends are located at each of the two opposing locations located in the circumferential direction of the cylindrical tube 1 with the end surfaces of the semicircular heat insulating member PA divided into two parts facing each other. By connecting the parts with the connecting member B, the connecting member can be attached even if there is no space corresponding to the length of the connecting member B on one side of the cylindrical pipe 1 in the axial direction of the semicircular heat insulating member PA. (See FIG. 16).

[Another embodiment]
Other embodiments are listed below.
(1) In the above-described embodiment, the case where the heat insulating member P is divided into two semicircles along the circumferential direction of the cylindrical tube 1 and the case where it is divided into four has been exemplified. , the heat insulating member P may be divided into three or five or more sections along the circumferential direction of the cylindrical tube 1. In addition, in the end mounting configuration, the heat insulating member P may be divided in the circumferential direction of the cylindrical tube 1. A semicircular heat insulating member PA may be formed by dividing the sheet into an even number of 6 or more along the line and connecting them.

(2) In the above embodiment, the case where the heat insulating member P is mounted on the outer peripheral portion of the cylindrical pipe 1 by the basic mounting structure and the end mounting structure was exemplified. It may be implemented in a form in which the heat insulating member P is mounted depending on the mounting configuration.

(3) In the above embodiment, the connection member B and the connection member 7 and the heat insulation member P are made of the same material, but the connection member B and the connection member 7 and the heat insulation member P are made of different materials. may be formed.

(4) In the above embodiment, the material of the heat insulating member P is urethane resin, but the material of the heat insulating member P is not limited to this. For example, the material of the heat insulating member P may be a synthetic resin such as polyethylene resin or nitrile rubber (NBR), or a natural resin such as natural rubber (NR). Similarly, the connection member B and the connection member 7 may be made of synthetic resin such as polyethylene resin or nitrile rubber (NBR), or natural resin such as natural rubber (NR).

(5) In the above embodiment, the case where three layers of heat insulation walls are formed as a plurality of layers of heat insulation walls on the outer peripheral portion of the cylindrical pipe 1 was exemplified. In addition, four or more layers of heat insulating walls may be formed.

(6) In the above embodiment, the case where the slits 12 are formed in the elongated rectangular body 11 as the connection member B is illustrated, but the formation of the slits 12 may be omitted.

(7) In the above embodiment, the connecting member B having a flat surface that engages with the recessed portion 10 having the inner side surface 10u and the outer side surface 10g is configured as an elongated rectangular body 11 having a rectangular cross section. However, the cross-sectional shape of the connecting member B having flat surfaces can be changed in various ways, such as forming the connecting member B having flat surfaces into an elongated body formed into a convex shape that gradually tapers on both end sides of the cross-sectional shape.

It should be noted that the configurations disclosed in the above embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

1 Cylindrical tube 5 End surface 7 Connecting member 7a Locking connecting part 8 Recessed groove part 8a Locking groove part 10 Recessed part 12 Slit 20 Cutting part 20a Locking concave part 21A Main body part 21a Locking convex part B Connecting member P Heat insulating member PA Semicircular heat insulating member U Engagement groove V Engagement portion

Claims (9)

A semicircular heat-insulating member, which is divided into two in the circumferential direction of the cylindrical pipe through which the low-temperature fluid flows, is positioned in the circumferential direction of the cylindrical pipe with the end surfaces of the cylindrical pipe facing each other. A cylindrical pipe heat insulating structure provided in a state where a pair of adjacent heat insulating member end portions are connected by a long connecting member along the axial direction of the cylindrical pipe at each of the opposing locations,
A groove-shaped engaging portion with which the connection member engages with each of the pair of ends of the heat insulating member at one side of the two opposing portions is provided in the radial direction of the cylindrical tube at the end of the heat insulating member. The cut portion obtained by cutting the inner portion of the cylindrical pipe along the circumferential direction of the cut portion is recessed radially outward of the cylindrical pipe into the radially outer side portion of the cylindrical pipe of the cut portion. formed in a form comprising a recess for
The connecting member at one of the two opposing locations has a cross-sectional shape that is engaged with the cut portion of each of the pair of ends of the heat insulating member, and a pair of engagement recesses. is formed in a form comprising a locking projection of
Along the tangential direction of the cylindrical tube from the end face as a groove-shaped engaging portion that the connecting member engages with each of the pair of the heat insulating member end portions at the other side of the two opposing locations The concave recessed portion is formed so that each of the inner surface and the outer surface aligned along the radial direction of the cylindrical tube is a flat surface along the tangential direction of the cylindrical tube,
The connecting member at the other of the two opposing locations is formed to have a cross-sectional shape having flat surfaces along the inner and outer surfaces of the recessed portions of the pair of ends of the heat insulating member. Insulated structure for cylindrical pipes. A semicircular heat-insulating member, which is divided into two in the circumferential direction of the cylindrical pipe through which the low-temperature fluid flows, is positioned in the circumferential direction of the cylindrical pipe with the end surfaces of the cylindrical pipe facing each other. A cylindrical pipe heat insulating structure provided in a state where a pair of adjacent heat insulating member end portions are connected by a long connecting member along the axial direction of the cylindrical pipe at each of the opposing locations,
A groove-shaped engaging portion with which the connection member engages is formed on each of the pair of ends of the heat insulating member at the two opposing locations, and the inner portion of the end portion of the heat insulating member in the radial direction of the cylindrical tube is provided. The cut portion cut along the circumferential direction of the cylindrical tube is provided with a locking recess that is recessed radially outward of the cylindrical tube on the radially outer side portion of the cut portion of the cylindrical tube. formed,
The connecting member at the two opposing locations has a cross-sectional shape of a body portion that engages with the respective cut portions of the pair of ends of the heat insulating member and a pair of locking projections that engage with the locking concave portion. A cylindrical pipe insulation structure formed in a form comprising: A semicircular heat-insulating member, which is divided into two in the circumferential direction of the cylindrical pipe through which the low-temperature fluid flows, is positioned in the circumferential direction of the cylindrical pipe with the end surfaces of the cylindrical pipe facing each other. A cylindrical pipe heat insulating structure provided in a state where a pair of adjacent heat insulating member end portions are connected by a long connecting member along the axial direction of the cylindrical pipe at each of the opposing locations,
At each of the pair of ends of the heat insulating member at the two opposing locations, recessed portions recessed from the end faces along the tangential direction of the cylindrical pipe are formed as groove-shaped engaging portions with which the connecting member engages. , formed in a form in which each of the inner surface and the outer surface aligned along the radial direction of the cylindrical tube is a flat surface along the tangential direction of the cylindrical tube,
The connecting members at the two opposing locations are formed to have a cross-sectional shape with flat surfaces along the inner and outer surfaces of the recessed portions of the pair of ends of the heat insulating member ,
The connecting member formed in a shape having a flat surface is formed of an elastically deformable material, and the engaging portion on one side of a pair of engaging portions that engage the adjacent recessed portions of the connecting member is provided with: A heat insulating structure for a cylindrical pipe , wherein a slit is formed to separate the engaging portion in the radial direction of the cylindrical pipe . A semicircular heat-insulating member, which is divided into two in the circumferential direction of the cylindrical pipe through which the low-temperature fluid flows, is positioned in the circumferential direction of the cylindrical pipe with the end surfaces of the cylindrical pipe facing each other. A cylindrical pipe heat insulating structure provided in a state where a pair of adjacent heat insulating member end portions are connected by a long connecting member along the axial direction of the cylindrical pipe at each of the opposing locations,
At each of the pair of ends of the heat insulating member at the two opposing locations, recessed portions recessed from the end faces along the tangential direction of the cylindrical pipe are formed as groove-shaped engaging portions with which the connecting member engages. , formed in a form in which each of the inner surface and the outer surface aligned along the radial direction of the cylindrical tube is a flat surface along the tangential direction of the cylindrical tube,
The connecting members at the two opposing locations are formed to have a cross-sectional shape with flat surfaces along the inner and outer surfaces of the recessed portions of the pair of ends of the heat insulating member,
The connecting member formed in a shape having a flat surface is formed of an elastically deformable material, and the engaging portions are provided in each of a pair of engaging portions that engage with the adjacent recessed portions of the connecting member. A heat insulating structure for a cylindrical pipe, wherein a slit is formed to separate the cylindrical pipe in a radial direction . The connecting member formed in a shape having a flat surface is formed of an elastically deformable material, and the engaging portion on one side of a pair of engaging portions that engage the adjacent recessed portions of the connecting member is provided with: 2. The heat insulating structure for a cylindrical pipe according to claim 1 , wherein a slit is formed to separate the engaging portion in the radial direction of the cylindrical pipe. The connecting member formed in a shape having a flat surface is formed of an elastically deformable material, and the engaging portions are provided in each of a pair of engaging portions that engage with the adjacent recessed portions of the connecting member. 2. The heat insulating structure for a cylindrical pipe according to claim 1 , wherein a slit is formed to separate the cylindrical pipe in the radial direction. A plurality of heat insulating walls formed in a cylindrical shape with different diameters by the semicircular heat insulating member divided into two are provided in a state of forming a plurality of layers on the outer peripheral portion of the cylindrical tube. The heat insulating structure for cylindrical pipes according to any one of claims 1 to 6 . It is divided into a plurality of parts in the circumferential direction of the cylindrical pipe at a position adjacent to the installation position of the semicircular heat insulating member connected by the connecting member on the outer peripheral portion of the cylindrical pipe in the axial direction of the cylindrical pipe. A pair of adjacent heat insulating member ends are arranged in the axial direction of the cylindrical pipe at each of a plurality of opposing locations located in the circumferential direction of the cylindrical pipe with the end surfaces of the arc-shaped heat insulating members facing each other. provided in a state of being connected by a long connecting member along the
A recessed groove recessed from the end face in the circumferential direction of the cylindrical tube is provided as an engaging groove of the connecting member in each of the pair of ends of the heat insulating member connected by the connecting member. is formed in a configuration in which a locking groove recessed radially outward of the cylindrical tube is provided on the radially outer side of the cylindrical tube,
The connecting member has a cross-sectional shape including a body connecting portion that engages with the recessed grooves of the pair of ends of the heat insulating member, and a pair of locking connecting portions that engage with the locking grooves. The heat insulating structure for a cylindrical pipe according to any one of claims 1 to 7 , wherein the heat insulating structure is formed. A plurality of heat insulating wall portions formed in a cylindrical shape with different diameters by the plurality of arc-shaped heat insulating members connected by the connecting member form a plurality of layers on the outer peripheral portion of the cylindrical tube. 9. The heat insulating structure for a cylindrical pipe according to claim 8 , wherein the heat insulating structure is provided in a state that

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