Inflatable rubber tire, skeleton and plug assembly for coating of cast pipes

Abstract

The application provides an inflatable rubber tire, a skeleton and a plug device for pipe coating. The inflatable rubber tire comprises a rubber tire body, an inflation nozzle, a pull ring belt and at least one air hole. The skeleton comprises an L-shaped component, a U-shaped component and a fender. The plug device comprises the inflatable rubber tire and the skeleton. When the skeleton and the inflatable rubber tire are used in combination for pipe coating, the coating on the inner wall of the end face of the pipe can be prevented from being stuck off.

Description

TECHNICAL FIELD

[0001] The present application relates to an inflatable rubber bladder for lining a cast pipe, a skeleton adapted for the inflatable rubber bladder, and a plug device comprising the skeleton and the inflatable rubber bladder. BACKGROUND

[0002] In the production of cast pipes (cast iron pipes), it is often necessary to form a lining on the inner wall thereof in order to prolong the service life of the cast pipe and the cleanliness of the conveyed medium. One common practice is to apply a cement lining having a thickness of 2 mm or more. Typically, a plug device is used to seal the two ends of the cast pipe; cement is then injected into the cast pipe, and, by means of high-speed rotation of the cast pipe, the cement slurry is caused to form a cement lining having a uniform thickness, a certain degree of hardness and adhesion on the inner wall of the cast pipe by centrifugal force, and water is possibly separated out during this process; finally, the plug device is removed, and the separated water is discharged.

[0003] However, for a long time, during the removal of the plug device, the cement applied to the end face of the cast pipe has often been stuck off. Therefore, it is often necessary for the on-site staff to manually re-patch the cement lining to ensure the integrity of the cement lining on the inner wall of the cast pipe. This not only prolongs the working time of the coating operation and is inefficient, but also causes the on-site environment to be contaminated by the cement and other working media due to manual patching, increasing the difficulty of subsequent cleaning work. In addition, the adhesion of the cement lining to the inner wall of the cast pipe is also affected by such post-patching.

[0004] Therefore, it is urgent to provide a rubber bladder, a skeleton and a plug device to prevent or at least reduce the sticking off of the cement on the end face of the cast pipe, reduce the labor burden and maintain the cleanliness of the working site environment. SUMMARY

[0005] The present application aims to provide an inflatable rubber bladder for lining a cast pipe, a skeleton adapted for the inflatable rubber bladder, and a plug device comprising the skeleton and the inflatable rubber bladder, which is at least in one aspect advantageous over the prior art.

[0006] To this end, the present application provides, in one aspect, an inflatable rubber bladder for lining a cast pipe, adapted to cooperate with a skeleton to form a plug device, the inflatable rubber bladder comprising:

[0007] a tire body having a substantially L-shaped cross-section and being hollow inside, the tire body comprising a forming wall, an expanding wall and a contact wall connected to each other, wherein the forming wall is adapted to fit into a pipe, the expanding wall is adapted to be expandable within a skeleton, the contact wall is adapted to contact the skeleton, and wherein the expanding wall comprises a first portion and a second portion, the angle between the inner surfaces of the two portions is less than 90 degrees, and wherein the first portion of the expanding wall is connected to the forming wall at one end and to the second portion of the expanding wall at the other end, the second portion of the expanding wall extends substantially along the axis;

[0008] a gas inlet connected to the tire body for inflating an inflation medium into the inside of the inflatable tire to inflate the inflatable tire;

[0009] a pull ring band located on the inner wall of the tire body and defining a first chamber and a second chamber respectively, the first chamber extends substantially along the axial direction, the second chamber extends substantially along the radial direction, the pull ring band is used to limit the axial expansion of the forming wall to maintain the angle of the forming wall and prevent the pull ring from falling off; and

[0010] at least one vent hole distributed on the pull ring band and configured to communicate the first chamber and the second chamber.

[0011] Optionally, the at least one vent hole is further configured such that, when inflated, both the first chamber and the second chamber can be fully inflated, and when deflated, both the first chamber and the second chamber can be fully deflated.

[0012] Optionally, the tire body further comprises at least one anti-slip ring configured on the forming wall to ensure that the pull ring is tightly secured on the pipe;

[0013] Optionally, the tire body further comprises at least one anti-slip rib.

[0014] Optionally, the tire body further comprises at least one sealing ring configured on the first portion of the expanding wall.

[0015] In another aspect, the present application can comprise a skeleton for pipe coating, adapted to cooperate with an inflatable tire to form a plug device, the skeleton comprising an accommodation portion defining an accommodation space,

[0016] and wherein the accommodation portion comprises: an L-shaped part and a U-shaped part opposite to each other and a limiting step connecting the two, wherein the L-shaped part extends beyond the U-shaped part in the axial direction, and wherein the L-shaped part comprises a third segment of the L-shaped part located on the outer side in the axial direction, the U-shaped part comprises a third segment of the U-shaped part located on the outer side in the axial direction, and the limiting step connects the inner surface of the third segment of the L-shaped part and the inner surface of the third segment of the U-shaped part;

[0017] Furthermore, the L-shaped component of the frame is provided with a through hole that can communicate with the outside atmosphere, and the U-shaped component of the frame is provided with at least one breathing hole that can communicate with the outside atmosphere.

[0018] Optionally, the frame further includes a mudguard having a connecting section and a shielding section, wherein the mudguard is connected to the receiving portion via the connecting section, and the shielding section is configured as a closed portion or has an opening for supplying a cement-injecting pipe into the casting pipe.

[0019] Optionally, the limiting step is configured such that the angle formed with the inner surface of the third section of the L-shaped component is 90 degrees.

[0020] Optionally, the limiting step is configured to form an angle greater than 90 degrees with the inner surface of the third section of the L-shaped component of the U-shaped component.

[0021] This application also includes, in another aspect, a plugging device for lining cast pipes, comprising: the aforementioned inflatable rubber tire and the aforementioned skeleton, wherein the receiving space of the skeleton is adapted to receive the tire body of the inflatable rubber tire, the through hole of the skeleton is configured to allow an inflation nozzle of the inflatable rubber tire to pass through it, the inflatable rubber tire has a first non-inflated state and a second inflated state, and wherein...

[0022] Before inflation, in its first state, the inflatable rubber tire body fits into the L-shaped component of the frame, and an expansion cavity is defined between the second part of the expansion wall and the inner surface of the U-shaped component of the frame. This expansion cavity defines the standard expansion and contraction path of the inflatable rubber tire.

[0023] During inflation, the tire body expands, and the second part of the expansion wall deforms precisely along a first direction having axial and radial components within the defined expansion path until it fits tightly against the inner surface of the U-shaped component, causing the expansion cavity to disappear. The inflatable tire is then in its second state.

[0024] After deflation, the inflatable rubber tire returns to its first state, the tire body retracts, and the second part of the expansion wall separates from the inner surface of the U-shaped component of the skeleton, reforming the expansion cavity.

[0025] Optionally, in the first state, the contact wall of the tire body is tightly fitted to the inner surface of the L-shaped component of the skeleton;

[0026] Optionally, at least a portion of the limiting step abuts against a second portion of the expansion wall.

[0027] Optionally, the plug device is configured to fit the spigot or socket of the cast pipe.

[0028] Therefore, the application provides a plug device, which forms an inflatable cavity between the inflatable rubber and the skeleton, so that the forming wall of the inflatable rubber still expands and contracts in the normal path under the action of air pressure, thereby preventing the cement coating of the inner wall of the casting pipe from being stuck by the plug device, and also having the advantages of reducing labor cost, high efficiency, preventing the deterioration of the on-site operation environment, and the like. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A partial cross-sectional view of a casting head device according to an embodiment of the application is shown, in which the inflatable rubber is in a first state;

[0030] Figure 2 A partial cross-sectional view of a casting head device according to an embodiment of the application is shown, in which the inflatable rubber is in a second state;

[0031] Figure 3 A partial cross-sectional view of a skeleton according to an embodiment of the application is shown;

[0032] Figure 4 A partial cross-sectional view of an inflatable rubber according to an embodiment of the application is shown;

[0033] Figure 5A -B shows another embodiment of the inflatable rubber according to the application, in which the inflatable rubber has an anti-slip ring and a sealing ring; and

[0034] Figure 6 Other possible embodiments of the construction of the breathing hole are shown. DETAILED DESCRIPTION

[0035] Some possible embodiments of the application are described below with reference to the accompanying drawings. It should be noted that the drawings are not drawn to scale. Some details can be exaggerated in order to clearly show the features, and some non-essential details are omitted.

[0036] It should be noted that in the present application, the terms "axial" and "radial" are defined with respect to the direction of the casting pipe, which is oriented with the center axis of the casting pipe. "Axial" and "radial" are used descriptively (only indicate the relative direction of the components) and are not limiting in any way (i.e., do not specify a particular direction). The terms "axial inner side" and "axial inward" refer to the direction towards the casting pipe. The terms "radial inner side" and "radial inward" refer to the direction towards the axis of the casting pipe.

[0037] As Figure 1 shown, the application discloses an inflatable rubber 2 suitable for a skeleton, a skeleton 3 suitable for the inflatable rubber 2, and a plug device 1 comprising the skeleton 3 and the inflatable rubber 2.

[0038] AsFigure 1 and Figure 4 As shown in FIG. 1, an inflatable tire 2 of the present disclosure is shown. The inflatable tire 2 includes a tire body 20. The tire body 20 is generally L-shaped in cross-section and can be made of any suitable material with stretchability, including but not limited to rubber. The interior of the tire body 20 is hollow to accommodate an inflation medium, including but not limited to air. The inflatable tire 2 includes a pull loop 21 inside the tire body 20. The material of the pull loop 21 can be rubber or any other suitable material. The pull loop 21 divides the interior of the tire body 20 into a first chamber 22 and a second chamber 23, where the first chamber 22 extends generally axially and the second chamber 23 extends generally radially. The pull loop 21 has at least one vent hole 24 distributed thereon. The at least one vent hole 24 communicates the first chamber 22 and the second chamber 23. The size and / or shape of the at least one vent hole 24 can be any suitable size and shape. In the case of two or more vent holes 24, the size and / or shape of each vent hole 24 can be the same or different. The tire body 20 includes a shaping wall 201, an inflation wall 202, and a contact wall 203 connected to each other. The shaping wall 201 is adapted to the cast tube 5. The inflation wall 202 is adapted to be inflated within the skeleton 3. The contact wall 203 is adapted to contact the skeleton 3. The shaping wall 201 is adapted to the socket 51 of the cast tube 5. An inflation valve 26 can be mounted on the contact wall 203 of the inflatable tire 2. An inner end of the inflation valve 26 can be located on the inner surface of the first chamber 22 (as shown in FIG. 1) or the second chamber 23 (not shown). Accordingly, the inflation medium can be filled into the first chamber 22 or the second chamber 23 of the inflatable tire 2 via the inflation valve 26 and inflate it. Because the vent hole 24 communicates the first chamber 22 and the second chamber 23, accordingly, the second chamber 23 or the first chamber 22 is also inflated. During the inflation process, the pull loop 21 is stretched to keep the angle and shape of the shaping wall 201 of the inflatable tire 2 substantially constant. Figure 1

[0039] As shown in FIG. 1, an inflatable tire 2 of the present disclosure is shown. The inflatable tire 2 includes a tire body 20. The tire body 20 is generally L-shaped in cross-section and can be made of any suitable material with stretchability, including but not limited to rubber. The interior of the tire body 20 is hollow to accommodate an inflation medium, including but not limited to air. The inflatable tire 2 includes a pull loop 21 inside the tire body 20. The material of the pull loop 21 can be rubber or any other suitable material. The pull loop 21 divides the interior of the tire body 20 into a first chamber 22 and a second chamber 23, where the first chamber 22 extends generally axially and the second chamber 23 extends generally radially. The pull loop 21 has at least one vent hole 24 distributed thereon. The at least one vent hole 24 communicates the first chamber 22 and the second chamber 23. The size and / or shape of the at least one vent hole 24 can be any suitable size and shape. In the case of two or more vent holes 24, the size and / or shape of each vent hole 24 can be the same or different. The tire body 20 includes a shaping wall 201, an inflation wall 202, and a contact wall 203 connected to each other. The shaping wall 201 is adapted to the cast tube 5. The inflation wall 202 is adapted to be inflated within the skeleton 3. The contact wall 203 is adapted to contact the skeleton 3. The shaping wall 201 is adapted to the socket 51 of the cast tube 5. An inflation valve 26 can be mounted on the contact wall 203 of the inflatable tire 2. An inner end of the inflation valve 26 can be located on the inner surface of the first chamber 22 (as shown in FIG. 1) or the second chamber 23 (not shown). Accordingly, the inflation medium can be filled into the first chamber 22 or the second chamber 23 of the inflatable tire 2 via the inflation valve 26 and inflate it. Because the vent hole 24 communicates the first chamber 22 and the second chamber 23, accordingly, the second chamber 23 or the first chamber 22 is also inflated. During the inflation process, the pull loop 21 is stretched to keep the angle and shape of the shaping wall 201 of the inflatable tire 2 substantially constant. Figure 1 Figure 3 ​​The diagram shows the skeleton 3 disclosed in this application. The skeleton 3 is generally rigid. The skeleton 3 may include a receiving portion 31. The receiving portion 31 defines a receiving space 4. The receiving portion 31 may include an L-shaped member 311, a U-shaped member 312, and a limiting step 313. The L-shaped member 311 and the U-shaped member 312 are configured opposite to each other. The L-shaped member 311 includes a third segment 311c of the L-shaped member located axially outward. The U-shaped member 312 includes a third segment 312c of the U-shaped member located axially outward. The limiting step 313 connects the third segment 311c of the L-shaped member and the third segment 312c of the U-shaped member. The angle formed by the limiting step 313 and the inner surface of the third segment 311c of the L-shaped member 311 can be 90 degrees, and the angle formed by the limiting step 313 and the inner surface of the third segment 312c of the U-shaped member 312 can be greater than 90 degrees. The L-shaped member extends beyond the U-shaped member in an axially inward direction.

[0040] In one implementation, such as Figure 3 As shown, the L-shaped component 311 includes a first segment 311a, a second segment 311b, and a third segment 311c. The second segment 311b extends in a generally parallel axial direction and includes two opposite ends in the axial direction. The first segment 311a is connected to one axially inner end of the second segment 311b and extends radially inward for a certain distance. In one embodiment, the angle between the inner surfaces of the first segment 311a and the second segment 311b is 90 degrees; in another embodiment, the angle between the inner surfaces of the first segment 311a and the second segment 311b is less than 90 degrees. The third segment 311c is connected to the other axially outer end of the second segment 311b and extends radially inward for a certain distance and connects to the U-shaped component 312, wherein, viewed in the radial direction, this distance is longer than the distance extended by the first segment 311a. In one embodiment, the frame 3 includes a through hole 316. The through hole 316 can be arranged in the third section 311c.

[0041] In one embodiment, the U-shaped component 312 can include a first section 312a, a second section 312b, and a third section 312c. The second section 312b extends substantially in an axial direction, and includes two ends opposite in the axial direction. The first section 312a is connected to one end of the second section 312b on the axial inner side, and extends a distance in a radially outward direction. The included angle between the inner surface of the first section 312a and the inner surface of the second section 312b is less than or equal to 90 degrees. The third section 312c is connected to the other end of the second section 312b on the axial outer side at one end thereof, and is connected to the L-shaped component 311 at the other end thereof by a limiting step 313. The included angle between the inner surface of the third section 312c of the U-shaped component 312 and the inner surface of the second section 312b thereof can be greater than 90 degrees. The included angle between the inner surface of the third section 312c of the U-shaped component 312 and the inner surface of the third section 311c of the L-shaped component 311 can be greater than 90 degrees.

[0042] In the case where the inflatable rubber tire 2 is used in cooperation with the framework 3, the inflatable rubber tire 2 is embedded in the accommodation space 4 defined by the framework 3. The forming wall 201 is not in contact with the framework 3. The contact wall 203 is in contact with and / or closely fitted to the inner surface of the L-shaped component 311 of the framework 3. The expansion wall 202 is connected to the forming wall 201 at one end; the expansion wall 202 is connected to the contact wall 203 at the other end. The expansion cavity 41 is defined by the inner surface of the U-shaped component 312 and the inflatable rubber tire 2.

[0043] The framework 3 further includes a through hole 316 and at least one breathing hole 317. The through hole 316 is provided to be adapted for the penetration of an inflation valve in the case where the inflatable rubber tire 2 is used in cooperation with the framework 3, while not affecting the close fitting between the rubber tire body 20 and the framework 3. One end of the at least one breathing hole 317 is arranged at the inner surface of the U-shaped component 312, and communicates the expansion cavity 41 and the outside atmosphere, so that the air pressure in the expansion cavity 41 is always balanced with the outside atmospheric pressure.

[0044] In one embodiment of the present application, optionally, the framework 3 can further include a fender 32. The fender 32 can be of any suitable and / or suitable configuration for a specific application known in the art, which can include a connecting section (which can have a certain slope (for example, for large size cast pipes) or be formed as a whole in the same plane (for example, for small size cast pipes)) and a shielding section. The fender 32 can be connected to the accommodation portion 31 through the connecting section. The shielding section can be fully closed or have an opening for the inside of the cast pipe (5) for the entry and exit of the distribution pipe for injecting cement.

[0045] As Figure 1 and Figure 2As shown, the plug device 1 of the present disclosure is shown, which comprises the skeleton 3 and the inflatable rubber tire 2. The features of the inflatable rubber tire 2 and the features of the skeleton 3 are as described above. The method of using the plug device 1 is described in detail below.

[0046] First, the inflatable rubber tire 2 is inserted into the accommodating space 4 defined by the L-shaped component 311 and the U-shaped component 312 of the accommodating portion 31 of the skeleton 3. The relative positions of the inflatable rubber tire 2 and the skeleton 3 are adjusted so that the inflation nozzle 26 passes through the through hole 316 of the skeleton 3 and the outer end of the inflation nozzle 26 is exposed to the outside atmosphere, so that the contact wall 203 of the tire body 20 is fitted to the inner surface of the L-shaped component 311 of the skeleton 3, so that at least part of the expansion wall 202 is defined with the inner surface of the U-shaped component 312 to form an expansion cavity 41, wherein at least part of the limiting step 313 abuts against the second part 202b of the expansion wall 202. In this way, the remaining part of the forming wall 201 and the expansion wall 202 is exposed and visible. In this way, the inflatable rubber tire 2 is in a first state (non-inflated state).

[0047] Then, the plug device 1 is externally inserted into the spout 51 of the casting pipe 5, so that the forming wall 201 is fitted to the spout 51. Then, the inside of the tire body 20 is filled with expansion medium through the inflation nozzle 26, so that the forming wall is further fastened to the spout 51 of the casting pipe 5; at the same time, the expansion wall 202 expands regularly in the path defined by the inner surface of the U-shaped component 312, the expansion cavity 41 gradually shrinks until it disappears, and the expansion wall 202 gradually fits closely to the inner surface of the U-shaped component 312. Specifically, the first part 202a of the expansion wall 202 slides into the U-shaped component 312 and fits to the inner surface of the axial inner side of the U-shaped component 312; the second part 202b of the expansion wall 202 fits to the inner surface of the radial inner side and the axial outer side of the U-shaped component 312. In this way, the plug device is fastened to the spout 51 of the casting pipe 5. In this way, the inflatable rubber tire 2 reaches a second state (inflated and expanded state).

[0048] In one embodiment of the present application, the fender 32 of the skeleton 3 has an opening, through which a cloth pipe for cement injection can be inserted into the casting pipe 5. Next, the casting pipe 5 with the plug device 1 fastened thereto is rotated at high speed along its central axis by a power device. By centrifugal action, the cement slurry is uniformly coated on the inner wall of the casting pipe 5, gradually forming a cement inner lining layer 52 with certain hardness and adhesion. In this process, the inflatable rubber tire 2 is in the second state (inflated and expanded state).

[0049] Finally, after the cement lining 52 is completely formed, the inflation medium in the inflatable bladder 2 is released (deflated), the expansion wall 202 is properly retracted in the path defined by the inner surface of the U-shaped member 312, the expansion cavity 41 is re-established and gradually enlarged, and the expansion wall 202 is separated from the inner surface of the U-shaped member 312. Specifically, the first portion 202a of the expansion wall 202 slides out of the U-shaped member 312 and is separated from the inner surface of the inner axial side of the U-shaped member 312; the second portion 202b of the expansion wall 202 is separated from the inner surface of the inner radial side and the inner axial side of the U-shaped member 312. In this way, the expansion cavity 41 is re-established. In this way, the inflatable bladder 2 returns to the first state.

[0050] Since one end of the at least one breathing hole 317 is arranged at the inner surface of the U-shaped member 312, the expansion cavity 41 and the outside atmosphere are communicated, so that the air pressure in the expansion cavity 41 is always balanced with the outside atmospheric pressure, thereby avoiding the suction of working medium (such as separated water and / or un-solidified cement slurry) in the expansion cavity 41 during the deflation process, which affects the service life of the plug device 1 and / or increases the labor burden.

[0051] Now, the plug device 1 can be conveniently removed from the casting pipe spout 51 without sticking the cement lining 52.

[0052] In one embodiment, the forming wall 201 includes a first portion 201a, a second portion 201b and a third portion 201c connected in sequence.

[0053] The first portion 201a of the forming wall extends substantially in the axial direction. When the plug device 1 is installed to the casting pipe 5, the first portion 201a of the forming wall 201 fits to the outer surface of the casting pipe 5. When the inflatable bladder 2 is inflated, the first portion 201a of the forming wall applies pressure inwardly in the radial direction, so that the first portion 201a of the forming wall abuts and tightly fits to the outer surface of the casting pipe.

[0054] The second portion 201b of the forming wall is shaped to fit the chamfered shape of the casting pipe port. When the plug device 1 is installed to the casting pipe 5, the second portion 201b of the forming wall fits to the chamfered surface of the casting pipe 5. When the inflatable bladder 2 is inflated, the second portion 201b of the forming wall abuts and tightly fits to the chamfered surface of the casting pipe.

[0055] The third portion 201c of the forming wall is shaped to fit the shape of the end surface of the casting pipe. When the plug device 1 is installed to the casting pipe 5, the third portion 201c of the forming wall fits to the end surface of the casting pipe 5. When the inflatable bladder 2 is inflated, the third portion 201c of the forming wall contacts the end surface of the casting pipe 5 and applies pressure in the axial inward direction, so that it abuts and tightly fits to the end surface of the casting pipe.

[0056] In one embodiment, the expansion wall 202 comprises a first portion 202a, a second portion 202b and a third portion 202c.

[0057] The first portion 202a of the expansion wall is connected to the forming wall 201 at one end and to the second portion 202b of the expansion wall at the other end (i.e. corner A). The included angle between the outer surface of the first portion 202a and the outer surface of the second portion 202b can be 90 degrees. The corner A can push against the inner surface of the first segment 312a of the U-shaped member when the plug device 1 is installed to the casting pipe 5. When the inflatable bladder 2 is inflated in the condition that the plug device 1 is installed to the casting pipe 5, the corner A is guided along the inner surface of the first segment 312a of the U-shaped member by sliding, forcing the expansion wall 202 to deform until the expansion cavity 41 disappears.

[0058] The second portion 202b of the expansion wall extends substantially axially or substantially parallel to the inner surface of the second segment 202b of the U-shaped member. The second portion 202b is connected to the first portion 202a of the expansion wall at one end (i.e. corner A) and to the third portion 202c of the expansion wall at the other end. Generally, the included angle between the outer surface of the second portion 202b of the expansion wall and the outer surface of the third portion 202c of the expansion wall is greater than 90 degrees. The second portion 202b is at a distance from the inner surface of the second segment 312b of the U-shaped member when the plug device 1 is installed to the casting pipe 5 which is not yet inflated. When the inflatable bladder 2 is inflated, the second portion 202b of the expansion wall deforms in a first direction having axial and radial components, constantly approaching the inner surface of the second segment 312b of the U-shaped member until closely fitting.

[0059] The third portion 202c of the expansion wall is connected to the second portion 202b at one end and to the contact wall 203 at the other end. Generally, the included angle between the outer surface of the third portion 202c of the expansion wall and the outer surface of the contact wall 203 is greater than 90 degrees. The end of the third portion 202c of the expansion wall (connected to the contact wall) abuts against the limiting step 313 when the plug device 1 is installed to the casting pipe 5, whether inflated or not. When the inflatable bladder 2 is inflated, the third portion 202c of the expansion wall deforms in a first direction having axial and radial components until the expansion cavity 41 disappears and the third portion 202c of the expansion wall closely fits to the third segment 312c of the U-shaped member.

[0060] It is noted that the above-mentioned "first direction having axial and radial components" refers to the direction axially inward and radially inward of the telescopic path defined by the expansion cavity 41.

[0061] In one embodiment, the contact wall 203 comprises a first portion 203a, a second portion 203b and a third portion 203c.

[0062] The first portion 203a of the contact wall extends substantially in a direction to fit the inner surface of the first section 311a of the L-shaped member. The first portion 203a is connected to the shaped wall 201 at one end and to the second portion 203b of the contact wall at the other end. The first portion 203a contacts the first section 311a of the L-shaped member when the plug device 1 is installed to the casting pipe 5. The first portion 203a exerts pressure to the first section 311a of the L-shaped member to fit tightly thereon when the inflatable rubber bladder 2 is inflated.

[0063] The second portion 203b of the contact wall extends substantially in a direction to fit the inner surface of the second section 311b of the L-shaped member. The second portion 203b of the contact wall is connected to the first portion 203a of the contact wall at one end and to the third portion 203c of the contact wall at the other end. The second portion 203b contacts the second section 311b of the L-shaped member when the plug device 1 is installed to the casting pipe 5. The second portion 203b exerts pressure to the second section 311b of the L-shaped member to fit tightly thereon when the inflatable rubber bladder 2 is inflated.

[0064] The third portion 203c of the contact wall extends substantially in a direction to fit the inner surface of the third section 311c of the L-shaped member. The third portion 203c of the contact wall is connected to the second portion 203b of the contact wall at one end and to the expansion wall 202 at the other end. The third portion 203c contacts the third section 311c of the L-shaped member when the plug device 1 is installed to the casting pipe 5. The third portion 203c exerts pressure to the third section 311c of the L-shaped member to fit tightly thereon when the inflatable rubber bladder 2 is inflated.

[0065] In the embodiments of the present application, the vent hole 24 communicates the first chamber 22 and the second chamber 23, so that both the first chamber 22 and the second chamber 23 can be fully inflated when inflated, and both the first chamber 22 and the second chamber 23 can be fully deflated when deflated.

[0066] In the embodiments of the present application, the pull ring band 21 restricts the expansion of the shaped wall 201 in the axial direction, and helps to make the expansion wall 202 expand or retract in the path restricted by the U-shaped member 312 as described above, to prevent the risk of sticking to the cement lining layer 52.

[0067] In the embodiments of the present application, when the inflatable rubber bladder 2 is used in cooperation with the framework 3, the contact wall 203 of the rubber bladder body 20 that contacts the inner surface of the third section 311c of the L-shaped member of the framework 3 always (in both the first state and the second state) fits tightly to the inner surface of the third section 311c of the L-shaped member of the framework 3, regardless of whether the inflatable rubber bladder 2 is inflated or deflated.

[0068] In the embodiments of the present application, the limiting step 313 always abuts against the second part 202b of the inflation wall 202 when the inflatable rubber tire 2 is used in cooperation with the skeleton 3, regardless of whether the inflatable rubber tire 2 is inflated or deflated.

[0069] As shown in Figure 5A -B, in another embodiment of the present application, the rubber tire body 20 of the inflatable rubber tire 2 can further comprise at least one anti-slip ring 204a and optionally at least one anti-slip rib 204b. The at least one anti-slip ring 204a is arranged on the shaped wall 201, preferably on the first part 201a of the shaped wall 201. The at least one anti-slip ring 204a is distributed radially around the pipe axis, and when inflated, the at least one anti-slip ring 204a provides space to prevent the shaped wall 201 from being wrinkled due to inflation, thereby affecting the close fit between the rubber tire and the pipe.

[0070] Optionally, the inflatable rubber tire can further comprise at least one anti-slip rib 204b. The at least one anti-slip rib 204b is distributed axially, connected to the at least one anti-slip ring 204a at one end and connected to the first part 201a of the shaped wall at the other end. In one embodiment, as shown in Figure 5A the outer surface of the anti-slip rib 204b can be in the same cylindrical or conical surface as the outer surface of the first part 201a of the shaped wall, as shown in Figure 5A the partial enlarged view I in Figure 5B In another embodiment, as shown in Figure 5B the outer surface of the anti-slip rib 204b can be in the same cylindrical or conical surface as the outer surface of the first part 201a of the shaped wall, as shown in Figure 5B the partial enlarged view I in

[0071] As shown in Figure 5A -B, in yet another embodiment of the present application, the rubber tire body 20 of the inflatable rubber tire 2 can further comprise at least one sealing ring 205. The at least one sealing ring 205 can be arranged on the first part 202a of the inflation wall 202 to prevent the inflation cavity 41 from sucking in working media such as precipitated water and / or cement that is not coated on the inner wall of the pipe 5 during the process of returning the inflatable rubber tire 2 from the second state to the first state after deflation.

[0072] In the embodiments of the present application, the inflatable rubber tire 2 can be disposable or reusable. This can depend on, for example, the material constituting the inflatable rubber tire 2, the manufacturing process, and the application purpose.

[0073] In other embodiments of the present application, one end of the breathing hole 317 can be located on the inner surface of the U-shaped part 312 of the skeleton 3, and the other end can be located at any suitable position of the skeleton 3 leading to the atmosphere, such as Figure 6 The embodiments shown are not limited to being located on the same side as the through hole 316 for the inflation nozzle 26.

[0074] In embodiments of the present application, the inflation nozzle 26 can be one or more. Accordingly, the through hole 316 is configured to suit the number and shape of the inflation nozzle 26.

[0075] In embodiments of the present application, as an alternative to the limiting step 313, the limiting step 313 can be shaped as a fixing groove. The end of the contact wall 203 to be fitted to the inner surface of the third section 311c of the L-shaped part of the skeleton 3 and radially innermost has a fixing ring cooperating therewith. The purpose of fastening (fitting) is achieved by the cooperation of the fixing groove and the fixing ring.

[0076] In embodiments of the present application, the inflation medium inside the inflatable rubber tire 2 can be any gas suitable for the needs of the specific scenario, including but not limited to air and / or inert gases such as nitrogen. In some cases, the inflation medium is not limited to gas, but also includes, for example, liquid. Accordingly, the inflation nozzle 26 described in the present application is not limited to being used to fill gas, but can be used as a device for filling any suitable inflation medium.

[0077] In embodiments of the present application, the rubber tire can also include other chambers (such as a third chamber, etc.) in addition to the first chamber 22 and the second chamber 23, which can be used to further maintain the angle of the formed wall and prevent the displacement of the rubber tire body 20.

[0078] Although the cement lining is exemplified in the present application, the scope of application of the present application is not limited to the cement lining.

[0079] Although the socket end of the cast pipe is exemplified in the present application, the skeleton 3, the inflatable rubber tire 2 and the plug device 1 of the present application can also be used for the bell end of the cast pipe.

[0080] Although the skeleton 3, the inflatable rubber tire 2 and the plug device 1 of the present application are described in the embodiment of the cast pipe, the scope of application of the skeleton 3, the inflatable rubber tire 2 and the plug device 1 of the present application is not limited to the cast pipe, but also to other pipe materials similar to the cast pipe that need to be sealed.

[0081] Although the present application is described herein with reference to specific embodiments, the scope of the present application is not limited to the details shown. Various modifications can be made to these details without departing from the essential principles of the present application.

Claims

1. An inflatable rubber sleeve (2) for coating a cast pipe (5), adapted to cooperate with a skeleton (3) to form a plug device (1), the inflatable rubber sleeve (2) comprising: a rubber sleeve body (20) having a generally L-shaped cross-section and being hollow inside, the rubber sleeve body (20) comprising a forming wall (201), an expanding wall (202) and a contact wall (203) connected to each other, wherein the forming wall (201) is adapted to fit the cast pipe (5), the expanding wall (202) is adapted to be inflatable within the skeleton (3), the contact wall (203) is adapted to contact the skeleton (3), and wherein the expanding wall (202) comprises a first portion (202a) and a second portion (202b) having inner surfaces with an included angle less than 90 degrees, and wherein the first portion (202a) of the expanding wall is connected to the forming wall (201) at one end and to the second portion (202b) of the expanding wall at the other end, the second portion (202b) of the expanding wall extending substantially along an axis; at least one anti-slip ring (204a) arranged on the forming wall (201), the at least one anti-slip ring (204a) providing a space to prevent the forming wall (201) from being wrinkled due to inflation of the expanding wall when inflated; an inflation nozzle (26) connected to the rubber sleeve body (20) for inflating an inflation medium into the inflatable rubber sleeve (2) to inflate the inflatable rubber sleeve (2); a pull ring band (21) located on an inner wall surface of the rubber sleeve body (20) and defining a first chamber (22) and a second chamber (23) respectively, the first chamber (22) extending substantially along an axial direction, the second chamber (23) extending substantially along a radial direction, the pull ring band (21) being used to limit the axial expansion of the forming wall (201) to maintain the angle of the forming wall and to facilitate the expansion or retraction of the expanding wall (202) in a path limited by a U-shaped part (312) of the skeleton (3) to prevent the plug device (1) from falling off; and at least one vent hole (24) distributed on the pull ring band (21) and configured to communicate the first chamber (22) and the second chamber (23).

2. The inflatable rubber tire (2) according to claim 1, wherein, The at least one vent hole (24) is further configured such that, when inflated, both the first chamber (22) and the second chamber (23) can be fully inflated, and when deflated, both the first chamber (22) and the second chamber (23) can be fully deflated.

3. The inflatable rubber tire (2) according to claim 1, wherein, The rubber sleeve body (20) further comprises at least one anti-slip rib (204b) distributed along the axial direction and connected to the at least one anti-slip ring (204a) at one end thereof.

4. The inflatable rubber tire (2) of claim 1, wherein, The rubber sleeve body (20) further comprises at least one sealing ring (205) arranged on the first portion (202a) of the expanding wall (202).

5. A skeleton (3) for coating a cast pipe (5), adapted to cooperate with the inflatable rubber sleeve (2) according to any one of claims 1-4 to form a plug device (1), the skeleton (3) comprising an accommodating portion (31) defining an accommodating space (4), And wherein, The accommodating portion (31) comprises: an L-shaped component (311) and a U-shaped component (312) opposite to each other, and a limiting step (313) connecting the two, wherein the L-shaped component (311) extends beyond the U-shaped component (312) in the axial direction, and wherein the L-shaped component (311) comprises an axially outer third section (311c) of the L-shaped component, the U-shaped component (312) comprises an axially outer third section (312c) of the U-shaped component, and the limiting step (313) connects the inner surface of the third section (311c) of the L-shaped component and the inner surface of the third section (312c) of the U-shaped component; And wherein a through hole (316) capable of communicating with the atmosphere outside is arranged on the L-shaped component (311) of the skeleton (3), and at least one breathing hole (317) capable of communicating with the atmosphere outside is arranged on the U-shaped component (312) of the skeleton (3).

6. The skeleton (3) according to claim 5, further comprising: A mudguard (32) having a connecting section and a shielding section, wherein the mudguard (32) is connected to the accommodating portion (31) through the connecting section, and the shielding section is configured as a closed section or has an opening for supplying a cloth pipe for injecting cement into the casting pipe (5).

7. The skeleton (3) according to claim 5, wherein The limiting step (313) is configured to form an angle of 90 degrees with the inner surface of the third section (311c) of the L-shaped component (311) of the L-shaped component.

8. The skeleton (3) according to claim 7, wherein The limiting step (313) is configured to form an angle greater than 90 degrees with the inner surface of the third section (312c) of the U-shaped component (312) of the U-shaped component.

9. A plug device (1) for lining a pipe (5), comprising: The inflatable tire (2) of any one of claims 1 to 4 and the skeleton (3) of any one of claims 5 to 8, wherein the accommodating space (4) of the skeleton (3) is adapted to receive the tire body (20) of the inflatable tire (2), the through hole (316) of the skeleton (3) is configured to be suitable for the inflation nozzle (26) of the inflatable tire (2) to pass therethrough, the inflatable tire (2) has a first state of non-inflation and a second state of inflation expansion, and wherein, Before inflation, the inflatable tire (2) is in the first state, the tire body (20) is fitted into the L-shaped component (311) of the skeleton (3), and the second portion (202b) of the expansion wall (202) defines an expansion cavity (41) with the inner surface of the U-shaped component (312) of the skeleton (3), the expansion cavity defines a specified expansion path of the inflatable tire (2), When inflated, the tire body (20) expands, the second portion (202b) of the expansion wall (202) expands and deforms in the specified expansion path in a first direction having axial and radial components until it closely fits the inner surface of the U-shaped component (312), the inflatable tire (2) is in the second state, and After deflation, the inflatable tire (2) returns to the first state, the tire body (20) retracts, the second portion (202b) of the expansion wall (202) separates from the inner surface of the U-shaped component (312) of the skeleton (3), and the expansion cavity (41) is reformed.

10. A plug device (1) according to claim 9, wherein In said first condition, the contact wall (203) of the tyre body (20) is tightly fitted to the inner surface of the L-shaped portion (311) of the carcass (3).

11. A plug device (1) according to claim 10, wherein At least a portion of the limiting step (313) abuts against the second portion (202b) of the expansion wall (202).

12. A plug device (1) according to claim 9, said plug device (1) being configured to fit into a spigot (51) or a socket of a casting tube (5).

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