Cast-in-place concrete insulation board system

Abstract

The utility model relates to the technical field of building materials, and discloses a cast-in-place concrete insulation board system, which comprises a board main body, a steel wire mesh, a connecting assembly, a deformed steel bar and a heat insulation assembly, the board main body is connected with the steel wire mesh through the connecting assembly, and the deformed steel bar is inserted on the connecting assembly. Along with movement of the deformed steel bar, after the deformed steel bar is completely inserted into the connecting pipe through adjustment of a trigger assembly, a pushing assembly and a closing assembly, two sets of heat insulation plates can close one end of the deformed steel bar, meanwhile, the other end of the deformed steel bar can be inserted into a heat insulation cap through movement, and a limiting rod is broken along with pressure generated by movement of the deformed steel bar; therefore, heat insulation protection treatment of the two ends of the deformed steel bar can be effectively completed after the deformed steel bar is installed, and the situation that the heat insulation cap needs to be disassembled frequently, the deformed steel bar needs to be inserted in a penetrating mode, and the heat insulation cap needs to be installed frequently is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of building materials, and more specifically to a cast-in-place concrete insulation board system. Background Art

[0002] Cast-in-place concrete insulation board is one of the most common building materials in the modern construction field. It is widely used on various building exterior walls due to its excellent thermal insulation and fire resistance.

[0003] The insulation board is usually composed of a board body, a limiter, a wire mesh, a threaded steel bar and an insulation cap, wherein the board body and the wire mesh are connected by a limiter, and the threaded steel bar can pass through the limiter and extend to the other end, so as to improve the overall connection strength during pouring, and the insulation cap is mainly installed at both ends of the threaded steel bar to reduce the heat conduction between the insulation layer and the concrete structure through the connecting parts and the threaded steel bar, further improve the thermal insulation performance of the insulation system, reduce the thermal bridge effect, prevent local heat loss or accumulation, and ensure the uniformity of the insulation effect.

[0004] During installation, the insulation cap is usually pre-installed on the limit piece. When installing the threaded steel bar on site, the insulation cap needs to be removed first, and then installed on the threaded steel bar after the installation is completed. As a result, it is necessary to frequently remove the insulation cap, insert the threaded steel bar and install the insulation cap, which greatly increases the work intensity and reduces the work efficiency. For this reason, we proposed a cast-in-place concrete insulation board system. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a cast-in-place concrete insulation board system to solve the problems of the cast-in-place concrete insulation board system.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a cast-in-place concrete insulation board system, including a board body, a steel wire mesh, a connecting assembly, threaded steel and a heat insulation assembly, the board body and the steel wire mesh are connected by a connecting assembly, the threaded steel is inserted into the connecting assembly, one end of the threaded steel extends through the connecting assembly to the other side of the board body, the heat insulation assembly is installed on the threaded steel inserted into the board body, the connecting assembly includes a clamping plate, a connecting pipe, a clamping mesh base plate and a clamping rib groove, the clamping plates are fixedly installed on the side walls of the board body at intervals, the connecting pipe is fixedly installed on the front side of the board body, and The rear end of the connecting tube passes through the clamping plate and the wall surfaces at the corresponding positions of the two groups of plate bodies and extends to the rear side of the plate body. The clamping mesh base plate is arranged at the front end of the wire mesh, and the position of the clamping mesh base plate corresponds to the position of the connecting tube. The clamping mesh base plate is fixedly installed on the side wall of the connecting tube. A clamping rib groove is provided at the end of the connecting tube away from the plate body. An extension tube is fixedly installed on the clamping plate of the rear group, and the position of the extension tube corresponds to the position of the connecting tube. The thermal insulation assembly includes a thermal insulation adjusting part and a thermal insulation set. The thermal insulation adjusting part is arranged on the end of the connecting tube away from the plate body, and the thermal insulation set is arranged on the end of the extension tube away from the plate body.

[0007] Preferably, the thermal insulation adjustment component includes an auxiliary ring plate, a closing component, a movable groove, a trigger component and a pushing component. The auxiliary ring plate is fixedly mounted on the side wall of the card net substrate away from the plate body. The closing component is arranged on the end of the connecting tube away from the plate body. Two groups of movable grooves are symmetrically opened on the side wall of the card net substrate close to the auxiliary ring plate. The movable grooves pass through the corresponding wall surface of the connecting tube and are connected with the interior of the connecting tube. The trigger component is arranged on the movable groove, and the pushing component is arranged between the closing component and the trigger component.

[0008] Preferably, the trigger member includes a moving block, an extrusion plate and an auxiliary spring. The moving block is arranged on the moving groove, and the moving block is inclined near one end of the connecting tube. The auxiliary spring is arranged inside the moving groove, and the two ends of the auxiliary spring are respectively connected to the moving block and the inner side wall of the moving groove. The extrusion plate is fixedly installed at the position of the moving block corresponding to the pushing member.

[0009] Preferably, the pushing member includes an adjusting plate, which is movably mounted on the inner side of the auxiliary ring plate through a movable shaft, and the extrusion plate and the closing member are both located on a side of the auxiliary ring plate close to the connecting pipe.

[0010] Preferably, the closing member comprises a heat insulation board, a telescopic rod, a connecting rod, a reset groove and a reset spring. The heat insulation board is divided into two groups, and the heat insulation board is in the shape of a semicircular block. The two groups of heat insulation boards are symmetrically arranged. The outer diameter of the heat insulation board is matched with the outer diameter of the connecting pipe, and the position of the heat insulation board and the position of the adjusting plate correspond to each other. A telescopic rod is fixedly installed on the outside of the connecting pipe corresponding to the position of the heat insulation board. The telescopic rod can be telescopically adjusted, and the position of the telescopic rod and the position of the adjusting plate correspond to each other. A reset groove is provided at the bottom of the heat insulation board corresponding to the position of the telescopic rod. A connecting rod is fixedly installed on one end of the telescopic rod away from the connecting pipe, and the connecting rod extends to the inner side of the reset groove away from the end of the telescopic rod. A reset spring is arranged inside the reset groove, and the two ends of the reset spring are respectively connected to the connecting rod and the side wall of the inner side of the reset groove close to the plate body.

[0011] Preferably, the thermal insulation kit includes a thermal insulation cap and a limiting rod. The thermal insulation cap is arranged on the side of the extension tube away from the clamping plate, and the thermal insulation cap is hollow on the side close to the extension tube. The inner diameter of the thermal insulation cap is matched with the outer diameter of the threaded steel bar. The limiting rod is arranged between the extension tube and the thermal insulation cap, and the two ends of the limiting rod are respectively connected to the wall surfaces at corresponding positions of the thermal insulation cap and the extension tube.

[0012] Preferably, a clamping ring is provided on the inner side of the thermal insulation cap.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. In the utility model, when installing the threaded steel bar, as the threaded steel bar moves, the trigger component, the pushing component and the closing component are adjusted so that the threaded steel bar is fully inserted into the connecting pipe, and then the two sets of insulation plates will close one end of the threaded steel bar. At the same time, the other end of the threaded steel bar will be inserted into the insulation cap by movement, and the pressure generated by the movement of the threaded steel bar will cause the limit rod to break, thereby completing the insulation treatment of the other end of the threaded steel bar. In this way, the insulation protection treatment of both ends of the threaded steel bar can be effectively completed after the threaded steel bar is installed, and the need to frequently remove the insulation cap, insert the threaded steel bar and install the insulation cap is effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the cast-in-place concrete insulation board system in the utility model;

[0016] Figure 2 For the utility model Figure 1 A local enlarged schematic diagram of the middle A;

[0017] Figure 3 It is a schematic diagram of the planar structure of the heat insulation adjustment member in the utility model;

[0018] Figure 4 For the utility model Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0019] Figure 5 It is a schematic diagram of the rear structure of the plate body in the utility model;

[0020] Figure 6 It is a partial cross-sectional structural schematic diagram of the heat insulation cap in the utility model.

[0021] Legend:

[0022] 1. Plate body; 2. Steel wire mesh; 3. Clamping plate; 4. Connecting pipe; 5. Clamping mesh base plate; 6. Auxiliary ring plate; 7. Clamping rib groove; 8. Heat insulation plate; 9. Adjusting plate; 10. Moving block; 11. Telescopic rod; 12. Connecting rod; 13. Extrusion plate; 14. Moving groove; 15. Auxiliary spring; 16. Reset groove; 17. Reset spring; 18. Extension tube; 19. Heat insulation cap; 20. Limiting rod; 21. Clamping ring. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific embodiments. However, people familiar with the art should understand that the detailed description given here in conjunction with the drawings is for better explanation, and the structure of the present invention necessarily exceeds these limited embodiments. For some equivalent replacement schemes or common means, they are no longer described in detail herein, but still fall within the scope of protection of the present application.

[0024] Figure 1 to Figure 6 It is the best embodiment of the utility model, and the following Figure 1 to Figure 6 The utility model is further described.

[0025] like Figure 1-Figure 6 As shown, a cast-in-place concrete insulation board system includes a board body 1, a steel wire mesh 2, a connecting assembly, threaded steel and a thermal insulation assembly. The material of the board body 1 includes but is not limited to extruded board, graphite extruded board, polystyrene board, and graphite polystyrene board. The board body 1 and the steel wire mesh 2 are connected by a connecting assembly, the threaded steel is inserted into the connecting assembly, and one end of the threaded steel extends through the connecting assembly to the other side of the board body 1, and the thermal insulation assembly is installed on the threaded steel inserted into the board body 1.

[0026] Furthermore, the connecting component includes a splint 3, a connecting tube 4, a mesh base plate 5 and a rib groove 7. The splints 3 are fixedly installed on the side walls of the plate body 1 at intervals, the connecting tube 4 is fixedly installed on the front side of the plate body 1, and the rear end of the connecting tube 4 passes through the splint 3 and the wall surfaces at corresponding positions of the two groups of plate bodies 1 and extends to the rear side of the plate body 1. The mesh base plate 5 is arranged at the front end of the wire mesh 2, and the position of the mesh base plate 5 and the position of the connecting tube 4 correspond to each other. The mesh base plate 5 is fixedly installed on the side wall of the connecting tube 4, and the mesh base plate 5 is installed on the wire mesh 2 through a "U"-shaped buckle. The plate body 1 and the wire mesh 2 are connected to each other through the connecting tube 4 and the mesh base plate 5, and a rib groove 7 is provided at the end of the connecting tube 4 away from the plate body 1.

[0027] In this embodiment, the "L" end of the threaded steel bar can be buckled through the rib groove 7.

[0028] Furthermore, an extension tube 18 is fixedly mounted on the rear group of clamping plates 3 , and the position of the extension tube 18 corresponds to the position of the connecting tube 4 .

[0029] In this embodiment, the extension tube 18 can be used to extend and support the threaded steel bar after installation, thereby improving the stability of the threaded steel bar during installation.

[0030] Furthermore, the heat insulation assembly includes a heat insulation adjustment piece and a heat insulation set piece. The heat insulation adjustment piece is arranged on the end of the connecting tube 4 away from the plate body 1 , and the heat insulation set piece is arranged on the end of the extension tube 18 away from the plate body 1 .

[0031] Furthermore, the heat insulation adjustment component includes an auxiliary ring plate 6, a closing component, a movable groove 14, a trigger component and a pushing component. The auxiliary ring plate 6 is fixedly mounted on the side wall of the card net substrate 5 away from the plate body 1. The closing component is arranged on the end of the connecting tube 4 away from the plate body 1. Two groups of movable grooves 14 are symmetrically opened on the side wall of the card net substrate 5 close to the auxiliary ring plate 6. The movable grooves 14 pass through the corresponding wall surface of the connecting tube 4 and are connected to the interior of the connecting tube 4. The trigger component is arranged on the movable groove 14, and the pushing component is arranged between the closing component and the trigger component.

[0032] In the present embodiment, after the threaded steel bar is inserted into the connecting tube 4, the side wall of the threaded steel bar is squeezed so that the trigger member is squeezed and triggered to adjust on the movable groove 14. The adjusting trigger member will drive the pushing member to adjust, so that the pushing member drives the closing member to adjust. The closing member will not close when the threaded steel bar is not fully inserted. When the threaded steel bar is fully inserted into the connecting tube 4, it will close with the assistance of the pushing member and the adjustment operation of the closing member.

[0033] Furthermore, the trigger member includes a moving block 10, an extrusion plate 13 and an auxiliary spring 15. The moving block 10 is arranged on the moving groove 14. The end of the moving block 10 close to the connecting tube 4 is inclined. The auxiliary spring 15 is arranged inside the moving groove 14. The two ends of the auxiliary spring 15 are respectively connected to the moving block 10 and the inner side wall of the moving groove 14. The extrusion plate 13 is fixedly installed at the position of the moving block 10 corresponding to the pushing member.

[0034] In this embodiment, by providing a moving block 10 with an inclined surface inside the connecting pipe 4 , when the threaded steel bar is inserted into the connecting pipe 4 , the moving block 10 can be effectively contracted and adjusted inside the moving groove 14 through the auxiliary spring 15 .

[0035] Furthermore, the pushing member includes an adjusting plate 9 , which is movably mounted on the inner side of the auxiliary ring plate 6 via a movable shaft, and the extrusion plate 13 and the closing member are both located on one side of the auxiliary ring plate 6 close to the connecting pipe 4 .

[0036] In this embodiment, the movement of the moving block 10 drives the extrusion plate 13 to push the adjustment plate 9, so that the other end of the adjustment plate 9 can be rotated and adjusted with the movable shaft as the axis point.

[0037] Furthermore, the closing member includes a heat insulation plate 8, a telescopic rod 11, a connecting rod 12, a reset groove 16 and a reset spring 17. The heat insulation plates 8 are divided into two groups, and the heat insulation plates 8 are semicircular blocks. The two groups of heat insulation plates 8 are symmetrically arranged. The outer diameter of the heat insulation plates 8 is adapted to the outer diameter of the connecting pipe 4, and the position of the heat insulation plates 8 corresponds to the position of the adjusting plate 9. A telescopic rod 11 is fixedly installed on the outer side of the connecting pipe 4 corresponding to the position of the heat insulation plate 8. The telescopic rod 11 can be telescopically adjusted. The position of the telescopic rod 11 corresponds to the position of the adjusting plate 9. A reset groove 16 is provided at the bottom of the heat insulation plate 8 corresponding to the position of the telescopic rod 11. A connecting rod 12 is fixedly installed at one end of the telescopic rod 11 away from the connecting pipe 4. The end of the connecting rod 12 away from the telescopic rod 11 extends to the inner side of the reset groove 16. A reset spring 17 is arranged inside the reset groove 16. The two ends of the reset spring 17 are respectively connected to the connecting rod 12 and the side wall of the inner side of the reset groove 16 close to the plate body 1.

[0038] In the present embodiment, when the end of the adjusting plate 9 away from the trigger member rotates with the movable axis as the axis point under the adjustment of the trigger member, the adjusting plate 9 will push the telescopic rod 11 so that the telescopic rod 11 drives the connecting rod 12 to contract inside the reset groove 16 through the reset spring 17. At this time, when the threaded steel is not fully inserted into the connecting pipe 4, it is restricted by the side wall of the threaded steel, so that the two groups of insulation boards 8 cannot be closed. When the threaded steel is fully inserted into the connecting pipe 4, the two groups of insulation boards 8 are not restricted by the threaded steel. After the connecting rod 12 moves in the reset groove 16, the elastic pressure generated on the reset spring 17 causes the two groups of insulation boards 8 to be closed by the elastic pressure.

[0039] Furthermore, the thermal insulation kit includes a thermal insulation cap 19 and a limiting rod 20. The thermal insulation cap 19 is arranged on the side of the extension tube 18 away from the clamp 3. The thermal insulation cap 19 is hollow on the side close to the extension tube 18. The inner diameter of the thermal insulation cap 19 is matched with the outer diameter of the threaded steel. The limiting rod 20 is arranged between the extension tube 18 and the thermal insulation cap 19. The two ends of the limiting rod 20 are respectively connected to the wall surfaces at the corresponding positions of the thermal insulation cap 19 and the extension tube 18. The limiting rod 20 is made of a material that is easy to break after being stretched.

[0040] In this embodiment, when one end of the threaded steel bar extends to the interior of the insulation cap 19 through the extension tube 18, and when the threaded steel bar is completely inserted into the interior of the insulation cap 19, as the threaded steel bar is pushed, the threaded steel bar will squeeze and push the insulation cap 19, so that the insulation cap 19 drives the limit rod 20 to pull and extend. When the limit rod 20 is subjected to the limit force, it will break. At this time, the insulation cap 19 is mounted on one end of the threaded steel bar and moves synchronously with the movement of the threaded steel bar.

[0041] Furthermore, a clamping ring 21 is provided on the inner side of the heat insulating cap 19 . The clamping ring 21 can be adjusted by compression deformation. The material of the clamping ring 21 includes but is not limited to rubber.

[0042] In this embodiment, the connection strength between the heat insulation cap 19 and the threaded steel bar can be enhanced by the clamping ring 21 .

[0043] The working principle and use process of this utility model:

[0044] When in use, after the insulation board is installed in the designated position, the threaded steel bar used to enhance the connection strength after pouring is inserted from the end of the movable groove 14 away from the plate body 1 through the movable groove 14, the plate body 1 and the extension tube 18 in sequence until the end of the threaded steel bar is buckled in the position in the clamping groove 7. At the same time, as the threaded steel bar is inserted, the threaded steel bar will squeeze the movable block 10 on the inner side of the connecting tube 4, so that the movable block 10 is contracted inside the movable groove 14 through the auxiliary spring 15, so that the extrusion plate 13 on the movable block 10 pushes the adjustment plate 9, so that the other end of the adjustment plate 9 rotates through the axis point, so that the adjustment plate 9 pushes the telescopic rod 11, so that the telescopic rod 11 is contracted and adjusted, and the telescopic rod 11 drives the connecting rod 12 is adjusted by the reset spring 17 on the inner side of the reset groove 16. When the threaded steel bar is not fully inserted, the two groups of insulation boards 8 cannot be closed due to the limitation of the side wall of the threaded steel bar. When the threaded steel bar is fully inserted into the connecting pipe 4, the reset spring 17 inside the reset groove 16 that has been compressed by the connecting rod 12 and the threaded steel bar no longer blocks the two groups of insulation boards 8. At the same time, when the threaded steel bar is being inserted and moved, the threaded steel bar is moved out through the extension tube 18 and inserted into the inner side of the insulation cap 19. As the threaded steel bar moves, the insulation cap 19 will drive the limit rod 20 to stretch until the limit rod 20 breaks. At this time, the insulation cap 19 will be mounted on the threaded steel bar and move to the specified position as the threaded steel bar moves.

[0045] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A cast-in-place concrete insulation board system, comprising a board body (1), a steel wire mesh (2), a connection assembly, threaded steel and a heat insulation assembly, wherein the board body (1) and the steel wire mesh (2) are connected via the connection assembly, the threaded steel is inserted into the connection assembly, one end of the threaded steel extends through the connection assembly to the other side of the board body (1), and the heat insulation assembly is installed on the threaded steel inserted into the board body (1), characterized in that: The connection assembly comprises a clamping plate (3), a connecting pipe (4), a clamping mesh base plate (5) and a clamping rib groove (7); the clamping plates (3) are fixedly installed at intervals on the side walls of the plate body (1); the connecting pipe (4) is fixedly installed on the front side of the plate body (1); and the rear end of the connecting pipe (4) passes through the clamping plate (3) and the wall surfaces at corresponding positions of the two sets of plate bodies (1) and extends to the rear side of the plate body (1); the clamping mesh base plate (5) is arranged at the front end of the steel wire mesh sheet (2); and the position of the clamping mesh base plate (5) and the position of the connecting pipe (4) correspond to each other. The card net base plate (5) is fixedly mounted on the side wall of the connecting tube (4); a card rib groove (7) is provided at one end of the connecting tube (4) away from the plate body (1); an extension tube (18) is fixedly mounted on a rear group of the clamping plates (3); the position of the extension tube (18) corresponds to the position of the connecting tube (4); the heat insulation assembly comprises a heat insulation adjustment part and a heat insulation set part; the heat insulation adjustment part is arranged on one end of the connecting tube (4) away from the plate body (1); and the heat insulation set part is arranged on one end of the extension tube (18) away from the plate body (1).

2. A cast-in-place concrete insulation board system according to claim 1, characterized in that: The heat insulation adjustment component comprises an auxiliary ring plate (6), a closing component, a movable groove (14), a trigger component and a push component. The auxiliary ring plate (6) is fixedly mounted on the side wall of the card net base plate (5) away from the plate body (1). The closing component is arranged at an end of the connecting tube (4) away from the plate body (1). Two groups of movable grooves (14) are symmetrically opened on the side wall of the card net base plate (5) close to the auxiliary ring plate (6). The movable grooves (14) penetrate the corresponding wall surface of the connecting tube (4) and are connected to the inside of the connecting tube (4). The trigger component is arranged on the movable groove (14), and the push component is arranged between the closing component and the trigger component.

3. A cast-in-place concrete insulation board system according to claim 2, characterized in that: The trigger member comprises a moving block (10), a pressing plate (13) and an auxiliary spring (15); the moving block (10) is arranged on the moving groove (14); one end of the moving block (10) close to the connecting pipe (4) is inclined; the auxiliary spring (15) is arranged inside the moving groove (14); two ends of the auxiliary spring (15) are respectively connected to the moving block (10) and the inner side wall of the moving groove (14); and the pressing plate (13) is fixedly mounted on the position of the moving block (10) corresponding to the pushing member.

4. A cast-in-place concrete insulation board system according to claim 3, characterized in that: The push member comprises an adjustment plate (9), the adjustment plate (9) being movably mounted on the inner side of the auxiliary ring plate (6) via a movable shaft, and the extrusion plate (13) and the closing member are both located on a side of the auxiliary ring plate (6) close to the connecting pipe (4).

5. A cast-in-place concrete insulation board system according to claim 4, characterized in that: The closing member comprises a heat insulation plate (8), a telescopic rod (11), a connecting rod (12), a reset groove (16) and a reset spring (17); the heat insulation plate (8) is in two groups, the heat insulation plate (8) is in the shape of a semicircular block, the two groups of heat insulation plates (8) are symmetrically arranged, the outer diameter of the heat insulation plate (8) is matched to the outer diameter of the connecting pipe (4), and the position of the heat insulation plate (8) and the position of the adjustment plate (9) correspond to each other; the outer side of the connecting pipe (4) is fixedly mounted with a telescopic rod (11) corresponding to the position of the heat insulation plate (8); the telescopic rod (11) can be telescopically adjusted, and the telescopic rod (11) can be telescopically adjusted. The position of the expansion joint (11) and the position of the adjustment plate (9) correspond to each other, a reset groove (16) is provided at the bottom of the heat insulation plate (8) corresponding to the position of the telescopic rod (11), a connecting rod (12) is fixedly mounted at one end of the telescopic rod (11) away from the connecting tube (4), the connecting rod (12) extends to the inner side of the reset groove (16) at one end away from the telescopic rod (11), a reset spring (17) is provided inside the reset groove (16), and two ends of the reset spring (17) are respectively connected to the connecting rod (12) and the side wall of the inner side of the reset groove (16) close to the plate body (1).

6. The cast-in-place concrete insulation board system according to claim 1, characterized in that: The heat insulation set comprises a heat insulation cap (19) and a limiting rod (20). The heat insulation cap (19) is arranged on a side of the extension tube (18) away from the clamping plate (3). The side of the heat insulation cap (19) close to the extension tube (18) is hollow. The inner diameter of the heat insulation cap (19) is matched with the outer diameter of the threaded steel bar. The limiting rod (20) is arranged between the extension tube (18) and the heat insulation cap (19). The two ends of the limiting rod (20) are respectively connected to the wall surfaces of the heat insulation cap (19) and the extension tube (18) at corresponding positions.

7. A cast-in-place concrete insulation board system according to claim 6, characterized in that: A clamping ring (21) is provided on the inner side of the heat insulation cap (19).

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