Inflatable tires, frames and plugging devices for cast pipe lining

Abstract

The present application provides an inflatable rubber tire, a frame and a plugging device for cast pipe lining. The inflatable rubber tire includes: a rubber tire body, an inflation nozzle, a pulling ring and at least one vent. The frame includes an L-shaped component, a T-shaped component and a fender. The plugging device includes an inflatable rubber tire and a frame. When the frame and the inflatable rubber tire are used in conjunction with cast pipe lining, the coating on the inner wall of the end face of the cast pipe can be prevented from being stuck off, and the end face angle of the lining layer can be made smaller.

Description

Technical Field

[0001] The present application relates to an inflatable rubber tire for casting pipe lining (especially suitable for casting pipe lining with a small end face angle of the lining layer), a frame suitable for the inflatable rubber tire and a plugging device including the frame and the inflatable rubber tire. Background Art

[0002] In the production process of cast pipes, in order to extend the service life of the cast pipes and the cleanliness of the conveying medium, it is often necessary to form a lining layer on the inner wall. A common practice is to apply a cement coating with a thickness of more than 2 mm. Usually, a plugging device is used to seal both ends of the cast pipe; then cement is injected into the cast pipe, and after the high-speed rotation of the cast pipe, the centrifugal effect is used to make the cement slurry gradually form a cement coating with uniform thickness, certain hardness and adhesion on the inner wall of the cast pipe. Water may precipitate in this process; finally, the plugging device is disassembled and removed, and the precipitated water is released.

[0003] However, for a long time, in the process of disassembling and removing the plug device, the plug often sticks off the cement coated on the end face of the cast pipe. Therefore, on-site workers are often required to manually repair the cement coating to ensure the integrity of the cement lining coated 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 polluted by cement and other working media due to manual repair, increasing the difficulty of subsequent cleaning work. In addition, the adhesion of the cement coating and the inner wall of the cast pipe manufactured by this later repair is also affected. In some cases, it is possible that the end face angle that requires the lining layer is smaller.

[0004] Therefore, it is urgent to provide a rubber tire, a skeleton and a plug device to prevent or at least reduce the cement from sticking off the end face of the cast pipe, reduce the manpower burden and keep the work site environment clean, and also meet the requirement of a smaller angle of the end face of the lining layer. Summary of the invention

[0005] The present application aims to provide an inflatable rubber tire for casting pipe lining, a frame suitable for the inflatable rubber tire and a plugging device including the frame and the inflatable rubber tire, which is advantageous over the prior art in at least one aspect.

[0006] To this end, the present application provides, in one aspect, an inflatable rubber tire for cast pipe lining, suitable for cooperating with a skeleton to form a plugging device, the inflatable rubber tire comprising:

[0007] A rubber tire body, which has a substantially L-shaped cross section and is hollow inside, the rubber tire body comprising a forming wall, an expansion wall and a contact wall connected to each other, and a fixing ring connected to the connection between the contact wall and the expansion wall, wherein the forming wall is suitable for casting the pipe, the expansion wall is adapted to be able to expand within the frame, the contact wall is adapted to contact the frame, and wherein the expansion wall comprises a first part, a second part, a third part, a fourth part and a fifth part connected in sequence, the second part and the third part are connected at a corner;

[0008] An inflation nozzle connected to the tire body and used to inflate an inflation medium into the inflatable tire to inflate the inflatable tire;

[0009] A pulling ring, which is located on the inner wall surface of the rubber tire body and defines a first chamber and a second chamber respectively, the first chamber extends substantially in the axial direction, the second chamber is substantially V-shaped, and the pulling ring is used to limit the axial expansion of the molding wall to maintain the angle of the molding wall and prevent the plugging device from falling off; and

[0010] At least one vent hole distributed on the pulling ring and configured to communicate the first chamber with the second chamber;

[0011] And wherein, when not inflated, the angle between the outer surface of the third portion of the expansion wall and the outer surface of the fourth portion of the expansion wall is less than 90 degrees, and when inflated, the angle gradually increases as the second chamber expands.

[0012] Optionally, the rubber tire body further comprises at least one anti-slip ring, which is arranged on the molding wall to ensure that the plugging device is fastened to the casting pipe;

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

[0014] Optionally, the angle between the outer surface of the first portion of the expansion wall and the outer surface of the second portion of the expansion wall is greater than 90 degrees.

[0015] Optionally, the outer surface of the second part of the expansion wall extends basically axially, and wherein, in the uninflated state, the angle between the outer surface of the second part of the expansion wall and the outer surface of the third part of the expansion wall is less than 90 degrees, and the angle gradually increases with inflation.

[0016] In another aspect, the present application provides a framework for cast pipe lining, which is suitable for cooperating with an inflatable rubber tire to form a plugging device, wherein the framework includes a receiving portion defining a receiving space, wherein the receiving space includes a fixing groove,

[0017] and wherein the accommodating portion comprises: an L-shaped member and a T-shaped member connected to each other at one end, wherein in the axial direction, the L-shaped member extends beyond the T-shaped member, and wherein the T-shaped member comprises a first section extending substantially in the radial direction and a second section extending substantially in the axial direction connected to each other, and a protrusion located on the second section and extending radially outward, the protrusion defining an axial inner side surface of the fixing groove;

[0018] and wherein the first section of the T-shaped member comprises a first surface extending generally axially and a second surface extending generally radially, the radial outer end of which is connected to the axial outer end of the first surface, and the second section of the T-shaped member comprises a first surface extending generally axially, the axial inner end of which is connected to the radial inner end of the second surface of the first section,

[0019] And wherein, a through hole which can communicate with the outside atmosphere is arranged on the L-shaped part of the frame, and at least one breathing hole which can communicate with the outside atmosphere is arranged on the T-shaped part of the frame.

[0020] Optionally, the frame further comprises: a fender connected to the receiving portion, which is configured to be closed or have an opening for supplying a distribution pipe for injecting cement into the casting pipe.

[0021] The present application provides a plugging device for cast pipe lining in another aspect, comprising any of the above-mentioned inflatable tires and any of the above-mentioned frames, wherein the accommodating space of the frame is adapted to receive the tire body of the inflatable tire, the through hole of the frame is configured to be suitable for the inflation nozzle of the inflatable tire to penetrate therethrough, the fixing groove is configured to be suitable for the fixing ring, the inflatable tire has a first non-inflated state and a second inflated state, and wherein,

[0022] Before inflation, the inflatable rubber tire is in a first state, the rubber tire body is fitted into the L-shaped part of the frame, and defines an expansion cavity between the rubber tire body and the T-shaped part of the frame, wherein the expansion cavity defines a standard expansion and contraction path of the inflatable rubber tire.

[0023] When inflated, the tire body expands, the first part, the second part and the third part of the expansion wall expand and deform along the second direction that is substantially axial, the fourth part of the expansion wall and the fifth part of the expansion wall expand and deform in a regular manner along the first direction that is axial and radially inward in the defined telescopic path until they are closely fitted to the inner surface of the T-shaped component, so that the expansion cavity disappears, and the inflatable tire is in the second state, and

[0024] After deflation, the inflatable rubber tire returns to the first state, the rubber tire body retracts, and the fourth and fifth parts of the expansion wall are separated from the T-shaped component of the frame to re-form the expansion shape.

[0025] Optionally, in the second state, the third portion of the expansion wall fits tightly against the first surface of the first section of the T-shaped component, the fourth portion of the expansion wall fits tightly against the second surface of the first section of the T-shaped component, and the fifth portion of the expansion wall fits tightly against the first surface of the second section of the skeleton.

[0026] Optionally, the fixing ring is further configured such that when the inflatable tire is used in conjunction with the frame, the fixing ring is fastened in the fixing groove regardless of being in the first state or the second state.

[0027] Optionally, in the uninflated state, the corner portion pushes against the first surface of the first section of the T-shaped member, and during inflation, the corner portion slides along the first surface of the first section of the T-shaped member and is guided to force the expansion wall to deform.

[0028] Therefore, the present application provides a plugging device, which forms an expansion cavity between the inflatable rubber tire and the frame, so that the molded wall of the inflatable rubber tire can still expand and contract in a standardized path under the action of air pressure, thereby preventing the cement coating on the inner wall of the cast pipe from being stuck to the plugging device, and also has many advantages such as reducing labor costs, high efficiency, and preventing deterioration of the on-site working environment; in addition, the present application can also meet the requirements of a smaller end face angle of the coating layer and when the inflatable rubber tire is deflated and removed from the plugging device, the inflatable rubber tire can be accurately reset in the rigid frame to ensure that the expansion cavity is re-formed. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0032] Figure 4 A partial cross-sectional view showing an embodiment of an inflatable tire according to the present application; and

[0033] Figure 5A -B shows another embodiment of the inflatable tire according to the present application, wherein the inflatable tire has an anti-slip ring. DETAILED DESCRIPTION

[0034] Some feasible implementations of the present application are described below with reference to the accompanying drawings. It should be noted that the drawings are not drawn to scale. Some details may be enlarged for clear display, and some unnecessary details are omitted.

[0035] It should be noted that in this application, the terms "axial" and "radial" are defined relative to the direction of the casting tube, oriented with respect to the central axis of the casting tube. The use of "axial" and "radial" is descriptive (only indicating the relative direction of the components) and is not limiting in any way (i.e., not specifying a specific direction). The terms "axially inside" and "axially inward" refer to the direction toward the casting tube. The terms "radially inside" and "radially inward" refer to the direction toward the axis of the casting tube.

[0036] like Figure 1 As shown, the present application discloses an inflatable rubber tire 2 suitable for a skeleton, a skeleton 3 suitable for the inflatable rubber tire 2 , and a plugging device 1 including the skeleton 3 and the inflatable rubber tire 2 .

[0037] like Figure 1 and Figure 4 As shown, an inflatable tire 2 disclosed in the present application is shown. The inflatable tire 2 includes a tire body 20. The tire body 20 can be made of any suitable material with expansion and contraction capabilities, including but not limited to rubber. The interior of the tire body 20 is hollow to accommodate an expansion medium, and the expansion medium includes but is not limited to air. The inflatable tire 2 includes a pulling ring 21 inside the tire body 20. The material of the pulling ring 21 can be rubber or any other suitable material. The pulling ring 21 divides the interior of the tire body 20 into a first chamber 22 and a second chamber 23, wherein the first chamber 22 extends approximately axially, and the cross-section of the second chamber 23 is approximately V-shaped, extending approximately radially and axially, respectively. At least one vent 24 is distributed on the pulling ring 21. The at least one vent 24 connects the first chamber 22 and the second chamber 23. The size and / or shape of the at least one vent 24 can be any suitable size and shape. In the case where there are two or more vents 24, the size and / or shape of each vent 24 can be the same or different. The tire body 20 includes a forming wall 201, an expansion wall 202 and a contact wall 203 connected to each other. The forming wall 201 is suitable for the cast pipe 5. The expansion wall 202 is adapted to be able to expand in the skeleton 3. The contact wall 203 is adapted to contact the skeleton 3. The forming wall 201 is adapted to be a socket 51 for the cast pipe 5. An inflation nozzle 26 can be installed on the contact wall 203 of the inflatable tire 2. One end of the inflation nozzle 26 inside can be located in the first chamber 22 (such as Figure 1The inner surface of the first chamber 22 or the second chamber 23 (not shown) or the second chamber 23 (not shown) of the inflatable tire 2 is formed. Accordingly, the expansion medium can be filled into the first chamber 22 or the second chamber 23 of the inflatable tire 2 through the inflation nozzle 26 and expand it. Because the vent hole 24 communicates with the first chamber 22 and the second chamber 23, the second chamber 23 or the first chamber 22 is also expanded accordingly. During the expansion process, the pulling ring band 21 is tightened to keep the angle and shape of the molding wall 201 of the inflatable tire 2 substantially constant.

[0038] The rubber tire 2 disclosed in the present application may further include a fixing ring 206. The fixing ring 206 is connected to the connection between the contact wall 203 and the expansion wall 202. The material of the fixing ring 206 can be any suitable material, which can be the same as or different from the material of the contact wall 203 and / or the expansion wall 202.

[0039] like Figure 1 and Figure 3 As shown, the skeleton 3 disclosed in the present application is shown. 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 component 311, a T-shaped component 312, and a protrusion extending in a radially outward direction on the T-shaped component 312. The L-shaped component 311 and the T-shaped component 312 are connected to each other. The L-shaped component 311 includes a third section 311c of the L-shaped component located axially outside. The T-shaped component 312 includes a second section 312b extending approximately in the axial direction. The third section 311c of the L-shaped component and the second section 312b of the T-shaped component are connected to each other. In the axially inward direction, the L-shaped component extends beyond the T-shaped component.

[0040] The accommodation space 4 may include a fixing groove 313', which is matched with the fixing ring 206 of the inflatable tire 2. The axial inner surface of the fixing groove 313' is defined by a protrusion located on the T-shaped component 312.

[0041] In one embodiment, if Figure 3As shown, the L-shaped component 311 includes a first section 311a, a second section 311b and a third section 311c. The second section 311b extends along a direction substantially parallel to the axial direction, and the second section 311b includes two opposite ends in the axial direction. The first section 311a is connected to one end of the axial inner side of the second section 311b and extends a certain distance in the radial inward direction. In one embodiment, the angle formed by the inner surface of the first section 311a and the inner surface of the second section 311b is 90 degrees; in another embodiment, the angle formed by the inner surface of the first section 311a and the inner surface of the second section 311b is less than 90 degrees. The third section 311c is connected to the other end of the axial outer side of the second section 311b, extends a certain distance in the radial inward direction and is connected to the T-shaped component 312, wherein, in the radial direction, the distance is longer than the distance extended by the first section 311a. In one embodiment, the skeleton 3 includes a through hole 316. The through hole 316 may be disposed in the third section 311 c .

[0042] In one embodiment, the T-shaped component 312 may include a first section 312a and a second section 312b. The first section 312a includes a first surface 312a1 extending substantially in the axial direction and a second surface 312a2 connected thereto extending substantially in the radial direction and located in the axial inner side. The second section 312b includes a first surface 312b1 extending substantially in the axial direction and located in the radial outer side. A protrusion extending radially outward is provided near the axial outer side of the first surface 312b1 of the second section 312b. The protrusion defines the surface of the axial inner side of the fixing groove 313'. The second section 312b extends substantially in the axial direction, and the second section 312b includes two opposite ends in the axial direction. The first section 312a is connected to one end of the axial inner side of the second section 312b and extends a certain distance in the radial outward direction. The angle between the second surface 312a2 of the first section 312a and the first surface 312b1 of the second section 312b is equal to or slightly greater than 90 degrees. The second section 312b is connected at the other end to the L-shaped member 311. An angle between the first surface 312b1 of the second section 312b of the T-shaped member 312 and the inner surface of the third section 311c of the L-shaped member 311 may be greater than 90 degrees.

[0043] When the inflatable tire 2 is used in conjunction with the skeleton 3, the inflatable tire 2 is embedded in the accommodating space 4 defined by the skeleton 3. The molding wall 201 does not contact the skeleton 2. The contact wall 203 contacts and / or fits tightly to the inner surface of the L-shaped component 311 of the skeleton 3. The expansion wall 202 is connected to the molding 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 tire body 20 and the inner surface of the T-shaped component 312. The skeleton 3 also includes a through hole 316 and at least one breathing hole 317. The through hole 316 is configured to be suitable for the passage of the inflation nozzle when the inflatable tire 2 and the skeleton 3 are used in conjunction, while not affecting the tight fit between the tire body 20 and the skeleton 3. One end of the at least one breathing hole 317 is arranged at the inner surface of the T-shaped component 312, connecting 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 frame 3 may further include a mudguard 32. The mudguard 32 may be any suitable configuration and / or arrangement known in the art and / or suitable for a specific application, and may include a connecting section (which may have a certain slope (for example, for large-sized cast pipes) or be formed as a whole in the same plane (for example, for small-sized cast pipes)) and a shielding section. The mudguard 32 may be connected to the accommodating portion 31 via the connecting section. The shielding section may be closed or may have an opening for the distribution pipe for injecting cement to enter and exit the cast pipe (5).

[0045] like Figure 1 and Figure 2 As shown, the plugging device 1 disclosed in the present application is shown, which includes the frame 3 and the inflatable rubber tire 2. The features of the inflatable rubber tire 2 and the features of the frame 3 are as described above. The following describes in detail the method of using the plugging device 1.

[0046] First, the inflatable tire 2 is inserted into the accommodation space 4 defined by the L-shaped part 311 and the T-shaped part 312 of the accommodation part 31 of the skeleton 3. The relative positions of the inflatable 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 matched to the inner surface of the L-shaped part 311 of the skeleton 3, so that at least part of the expansion wall 202 and the surface 312a2, 312b1 of the T-shaped part 312 define the expansion cavity 41, wherein the fixing ring 206 of the inflatable tire 2 is fastened in the fixing groove 313' defined by the skeleton. In this way, the remaining parts of the molding wall 201 and the expansion wall 202 except the at least part are exposed and visible. In this way, the inflatable tire 2 is in the first state (non-inflated state).

[0047] Then, the plugging device 1 is inserted into the socket 51 of the casting pipe 5, so that the molding wall 201 fits into the socket 51. Then, the expansion medium is filled into the tire body 20 through the inflation nozzle 26, so that the molding wall is further fastened to the socket 51 of the casting pipe 5; at the same time, a part of the expansion wall 202 is standardizedly expanded in the telescopic path defined by the surfaces 312a2 and 312b1 of the T-shaped component 312, and the expansion cavity 41 gradually shrinks until it disappears, and the part of the expansion wall 202 gradually fits tightly to the surfaces 312a2 and 312b1 of the T-shaped component 312. The remaining part of the expansion wall 202 except the part extends axially and abuts against the first surface 312a1 of the first section 312a of the T-shaped component in the radial direction. In this way, the plugging device is fastened to the socket 51 of the casting pipe 5. In this way, the inflatable tire 2 reaches the second state (inflated state).

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

[0049] Finally, after the cement liner 52 is formed, the expansion medium in the inflatable tire 2 is released (deflated), the expansion wall 202 is retracted in a standardized manner in the telescopic path defined by the surfaces 312a2 and 312b1 of the T-shaped member 312, the expansion cavity 41 is regenerated and gradually enlarged, and the expansion wall 202 is separated from the surfaces 312a2 and 312b1 of the T-shaped member 312. In this way, the expansion cavity 41 is re-formed. In this way, the inflatable tire 2 returns to the first state.

[0050] Since one end of at least one breathing hole 317 is arranged on the surface 312a2, 312b1 of the T-shaped component 312, connecting the expansion cavity 41 and the external atmosphere, the air pressure in the expansion cavity 41 is always balanced with the external atmospheric pressure, thereby avoiding the expansion cavity 41 from sucking in working media (such as precipitated water and / or unsolidified cement slurry) during the deflation process, which affects the service life of the plugging device 1 and / or increases the manpower burden.

[0051] Now, the plug device 1 can be easily removed from the cast pipe socket 51 without the cement lining layer 52 being stuck off.

[0052] In one embodiment, the molding wall 201 includes a first part 201a, a second part 201b and a third part 201c connected in sequence. The first part 201a of the molding wall extends substantially in the axial direction. When the plug device 1 is installed to the cast pipe 5, the first part 201a of the molding wall 201 is matched to the outer surface of the cast pipe 5. When the inflatable rubber tire 2 is inflated, the first part 201a of the molding wall applies pressure inwardly in the radial direction so that the first part 201a of the molding wall abuts against and fits closely to the outer surface of the cast pipe. The second part 201b of the molding wall is formed into a chamfered shape that matches the cast pipe port. When the plug device 1 is installed to the cast pipe 5, the second part 201b of the molding wall is matched to the chamfered surface of the cast pipe 5. When the inflatable rubber tire 2 is inflated, the second part 201b of the molding wall abuts against and fits closely to the chamfered surface of the cast pipe. The third part 201c of the molding wall is formed into a shape that matches the end face of the cast pipe. When the plugging device 1 is installed on the cast pipe 5, the third portion 201c of the molded wall fits into the end face of the cast pipe 5. When the inflatable rubber tire 2 is inflated, the third portion 201c of the molded wall contacts the end face of the cast pipe 5 and applies pressure in the axial inward direction, so that it abuts against and fits tightly against the end face of the cast pipe.

[0053] In one embodiment, the expansion wall 202 includes a first portion 202a, a second portion 202b, a third portion 202c, a fourth portion 202d, and a fifth portion 202e that are sequentially connected.

[0054] The first portion 202a is connected to the molding wall 201 at one end and to the second portion 202b of the expansion wall at the other end. The angle between the outer surface of the first portion 202a and the outer surface of the second portion 202b can be slightly greater than 90 degrees. When the inflatable tire 2 is inflated, the first portion 202a of the expansion wall expands and moves along the second direction in the substantially axial direction until the expansion cavity 41 disappears, and substantially maintains its angle with the molding wall 201.

[0055] The outer surface of the second part 202b extends substantially in the axial direction. The second part 202b is connected to the first part 202a of the expansion wall at one end and is connected to the third part 202c of the expansion wall at the other end (i.e., corner A). Generally, in an uninflated state, the angle between the outer surface of the second part 202b of the expansion wall and the outer surface of the third part 202c of the expansion wall is less than 90 degrees, and as the inflation expands, the angle gradually increases to greater than 90 degrees. When the plugging device 1 is installed to the cast pipe 5 and has not been inflated, the corner A where the second part 202b is connected to the third part 202c can be pushed against the first surface 312a1 of the first section 312a of the T-shaped component. When the inflatable tire 2 is inflated, the corner portion (A) slides and is guided along the first surface (312a1) of the first section of the T-shaped component, forcing the expansion wall (202) to deform. At the same time, the second portion 202b of the expansion wall expands and deforms along a second direction in a substantially axial direction until the expansion cavity 41 completely disappears; the 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 gradually increases, from less than 90 degrees to greater than 90 degrees.

[0056] The third part 202c of the expansion wall is connected to the second part 202b at one end (i.e., corner A) and connected to the fourth part 202d of the expansion wall at the other end. Generally, in the uninflated state, the angle between the outer surface of the third part 202c of the expansion wall and the outer surface of the fourth part 202d of the expansion wall is less than 90 degrees, and in the inflated state, it gradually increases to more than 90 degrees. When the plugging device 1 is installed on the cast pipe 5, the corner A of the third part 202c of the expansion wall connected to the second part 202b can be pushed against the first surface 312a1 of the first section 312a of the T-shaped member. When the inflatable tire 2 is inflated, the corner A slides on the first surface 312a1, and the other end of the third part 202c of the expansion wall connected to the fourth part 202d gradually approaches the connection between the first surface 312a1 of the first section 312a of the T-shaped component and the second surface 312a2 until they overlap. At the same time, the third part 202c of the expansion wall expands and deforms in the second direction along the substantially axial direction, so that the third part 202c of the expansion wall fits tightly to the first surface 312a1 of the first section 312a of the T-shaped component; the angle between the outer surface of the third part 202c of the expansion wall and the outer surface of the fourth part 202d of the expansion wall gradually increases, from less than 90 degrees to greater than 90 degrees.

[0057] It should be noted that the above-mentioned "substantially axial second direction" refers to the axial inward direction defined by the first surface 312a1 of the first section of the T-shaped component, with the taper of the axis as the generatrix being no greater than 10°, and optionally no greater than 5°. The taper may diverge from the axial inward direction or the axial outward direction.

[0058] The fourth part 202d is connected to the third part 202c at one end thereof and to the fifth part 202e at the other end. Generally, in the uninflated state, the angle between the outer surface of the fourth part 202d and the outer surface of the fifth part 202e is less than 90 degrees, and in the inflated state, it gradually increases to equal to or greater than 90 degrees. When the plugging device 1 is installed on the cast pipe and not inflated, the fourth part 202c does not contact any part of the skeleton 3. When the inflatable rubber tire 2 is inflated, the fourth part 202c expands and deforms roughly along the first direction having axial and longitudinal components until it contacts and fits tightly to the second surface 312a2 of the first section of the T-shaped component, and at the same time, the angle between the outer surface of the fourth part 202d and the outer surface of the fifth part 202e gradually increases from less than 90 degrees to equal to or greater than 90 degrees.

[0059] The fifth part 202e is connected to the fourth part 202d at one end and to the contact wall 203 at the other end. The fifth part 202e extends substantially parallel to the first surface 312b1 of the second section of the T-shaped member. A fixing ring 206 is connected to one end of the fifth part 202e connected to the contact wall 203. When the plugging device 1 is installed on the cast pipe and not yet inflated, the fifth part 202e does not contact any part of the frame 3; the fixing ring 206 is fastened in the fixing groove 313' defined by the frame. When the inflatable tire 2 is inflated, the fifth part 202e expands and moves radially inward, and the end of the fifth part 202e connected to the contact wall 203 abuts against the protrusion above the fixing groove 313', and the end of the fifth part 202e connected to the fourth part 202d expands and moves until it coincides with the connection between the second surface 312a2 of the first segment and the first surface 312b1 of the second segment of the skeleton, and at the same time, the fifth part 202e expands and deforms along a first direction having axial and radial components, so that the expansion cavity 41 completely disappears.

[0060] It should be noted that the above “first direction having axial and radial components” refers to the direction of the telescopic path defined by the expansion cavity 41 axially inward and radially inward.

[0061] In one embodiment, the contact wall 203 includes a first portion 203a, a second portion 203b, and a third portion 203c connected in sequence. The first portion 203a extends substantially along the direction of the inner surface of the first section 311a of the L-shaped component. The first portion 203a is connected to the molding wall 201 at one end and is connected to the second portion 203b of the contact wall at the other end. When the plug device 1 is installed to the cast pipe 5, the first portion 203a contacts the first section 311a of the L-shaped component. When the inflatable tire 2 is inflated, the first portion 203a applies pressure to the first section 311a of the L-shaped component to fit closely thereon. The second portion 203b of the contact wall extends substantially along the direction of the inner surface of the second section 311b of the L-shaped component. The second portion 203b of the contact wall is connected to the first portion 203a of the contact wall at one end and is connected to the third portion 203c of the contact wall at the other end. When the plugging device 1 is installed to the cast pipe 5, the second part 203b contacts the second section 311b of the L-shaped component. When the inflatable tire 2 is inflated, the second part 203b applies pressure to the second section 311b of the L-shaped component to fit closely thereon. The third part 203 of the contact wall extends substantially in a direction that fits the inner surface of the third section 311c of the L-shaped component. The third part 203c of the contact wall is connected to the second part 203b of the contact wall at one end and to the expansion wall 202 at the other end. When the plugging device 1 is installed to the cast pipe 5, the third part 203c contacts the third section 311c of the L-shaped component. When the inflatable tire 2 is inflated, the third part 203c applies pressure to the third section 311c of the L-shaped component to fit closely thereon.

[0062] In the embodiment of the present application, the vent hole 24 connects the first chamber 22 and the second chamber 23, so that when inflated, the first chamber 22 and the second chamber 23 can both be fully expanded, and when deflated, the first chamber 22 and the second chamber 23 can both be fully retracted.

[0063] In the embodiment of the present application, the pulling ring band 21 limits the expansion of the forming wall 201 in the axial direction, which helps to make the expansion wall 202 expand or retract properly in the telescopic path limited by the T-shaped component 312 as described above, so as to prevent the cement lining layer 52 from being stuck off.

[0064] In an embodiment of the present application, when the inflatable tire 2 is used in conjunction with the frame 3, the contact wall 203 of the tire body 20 that contacts the inner surface of the third section 311c of the L-shaped component of the frame 3 always (in both the first state and the second state) fits tightly against the inner surface of the third section 311c of the L-shaped component of the frame 3, regardless of whether the inflatable tire 2 is inflated or deflated.

[0065] In the embodiment of the present application, when the inflatable tire 2 is used in conjunction with the frame 3, the fixing ring 206 of the inflatable tire 2 is always (in both the first state and the second state) fastened in the fixing groove 313' of the frame 3, regardless of whether the inflatable tire 2 is inflated or deflated.

[0066] like Figure 5A -B, in another embodiment of the present application, the tire body 20 of the inflatable tire 2 may further include 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 molding wall 201, preferably on the first part 201a of the molding wall 201. The at least one anti-slip ring 204a is distributed radially with the casting pipe axis as the center. When inflated, the at least one anti-slip ring 204a provides space to prevent the molding wall 201 from wrinkling due to expansion, thereby affecting the close fit between the tire and the casting pipe.

[0067] Optionally, the inflatable tire may further include at least one anti-slip rib 204b. The at least one anti-slip rib 204b is distributed along the axial direction, connected to the at least one anti-slip ring 204a at one end, and connected to the first portion 201a of the molding wall at the other end. Figure 5A As shown, the outer surface of the anti-slip rib 204b may not be in the same cylindrical or conical surface as the outer surface of the first portion 201a of the molding wall, but may be in a cylindrical or conical surface located at a certain distance radially outward relative to the molding wall, such as Figure 5A As shown in the partial enlarged view I; in another embodiment, as Figure 5B As shown, 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 portion 201a of the molded wall, such as Figure 5B The anti-slip ring 204a and / or the anti-slip rib 204b are used to ensure that the plug device 1 is fastened to the cast pipe 5 and is not easy to fall off even when the cast pipe 5 rotates at a high speed.

[0068] In the embodiment of the present application, the inflatable rubber tire 2 can be disposable or reusable, which may depend on, for example, the material constituting the inflatable rubber tire 2, the manufacturing process and the application purpose.

[0069] In other embodiments of the present application, one end of the breathing hole 317 can be located on the surface of the defined accommodating space 4 of the T-shaped component 312 of the skeleton 3, and the other end can be opened at any suitable position of the skeleton 3 leading to the outside atmosphere, and is not limited to being located on the same side as the through hole 316 for the inflation nozzle 26.

[0070] In the embodiment of the present application, there may be one or more inflation nozzles 26 . Accordingly, the through hole 316 is configured to be suitable for the number and shape of the inflation nozzles 26 .

[0071] In the embodiment of the present application, the inflation medium filled in the inflatable tire 2 can be any gas suitable for the specific scene, including but not limited to air and / or inert gas 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 for filling gas, but can be used for filling any suitable inflation medium.

[0072] In the embodiment of the present application, the tire may further include other chambers (such as a third chamber, etc.) in addition to the first chamber 22 and the second chamber 23 , which may be used to further maintain the angle of the molding wall and prevent the tire body 20 from shifting.

[0073] Although cement lining is taken as an example in the present application, the application scope of the present application is not limited to cement lining.

[0074] Although the skeleton 3, inflatable rubber tire 2 and plugging device 1 of the present application are described in the present application by taking the use of the socket of the cast pipe as an example, the skeleton 3, inflatable rubber tire 2 and plugging device 1 of the present application can also be used for the socket of the cast pipe.

[0075] Although the skeleton 3, inflatable rubber tire 2 and plugging device 1 of the present application are described in the embodiment of the cast pipe, the application scope of the skeleton 3, inflatable rubber tire 2 and plugging device 1 of the present application is not limited to cast pipes, and can also be used in other pipes similar to cast pipes that need to be sealed.

[0076] 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 may be made to these details without departing from the basic principles of the present application.

Claims

1. An inflatable rubber tire for casting pipe lining, suitable for cooperating with a frame (3) to form a plugging device (1), wherein: The frame (3) comprises a T-shaped component (312), wherein the T-shaped component (312) is configured such that: when inflated, a portion of the expansion wall (202) of the inflatable tire (2) can be attached to the T-shaped component (312), and when not inflated, the expansion wall (202) is separated from the T-shaped component (312), wherein the inflatable tire (2) comprises: The tire body (20) has a substantially L-shaped cross section and is hollow inside. The tire body (20) includes a molding wall (201), an expansion wall (202) and a contact wall (203) connected to each other, and a fixing ring (206) connected to the connection between the contact wall (203) and the expansion wall (202). The forming wall (201) is configured to adapt to the casting pipe (5), the expansion wall (202) is adapted to be able to expand within the frame (3), and the contact wall (203) is adapted to contact the frame (3). And wherein the expansion wall (202) comprises a first part (202a), a second part (202b), a third part (202c), a fourth part (202d) and a fifth part (202e) connected in sequence, wherein the first part (202a) is connected to the molding wall (201) at an angle at one end and is connected to the second part (202b) of the expansion wall at the other end at an angle slightly greater than 90 degrees, the second part (202b) and the third part (202c) are connected at a corner (A), the fourth part (202d) is connected to the third part (202c) at one end at an angle less than 90 degrees in an uninflated state and is connected to the fifth part (202e) at the other end at an angle less than 90 degrees in an uninflated state, and the fifth part (202e) is connected to the contact wall (203) at an angle at the other end; An inflation nozzle (26) connected to the tire body (20) and used to inflate an inflation medium into the inflatable tire (2) to inflate the inflatable tire (2); A pulling ring (21) is located on the inner wall surface of the rubber tire body (20) and defines a first chamber (22) and a second chamber (23) therewith, the first chamber (22) extending approximately in the axial direction, and the second chamber being approximately V-shaped. The pulling ring (21) is used to limit the axial expansion of the molding wall (201) to maintain the angle of the molding wall and prevent the plugging device (1) from falling off; and at least one vent hole (24) distributed on the pulling ring (21) and configured to communicate the first chamber (22) and the second chamber (23); And wherein, when not inflated, the angle between the outer surface of the third part (202c) of the expansion wall and the outer surface of the fourth part (202d) of the expansion wall is less than 90 degrees, and when inflated, the angle gradually increases as the second chamber (23) expands.

2. The inflatable tire according to claim 1, wherein: The rubber tire body (20) further comprises at least one anti-slip ring, which is arranged on the molding wall (201) to ensure that the plugging device (1) is fastened to the casting pipe (5); The rubber tire body (20) also includes at least one anti-slip rib.

3. The inflatable tire according to claim 1, wherein: The angle between the outer surface of the first portion (202a) of the expansion wall (202) and the outer surface of the second portion (202b) of the expansion wall (202) is greater than 90 degrees.

4. The inflatable tire according to claim 1, wherein: The outer surface of the second part (202b) of the expansion wall (202) extends basically axially, and wherein, in the uninflated state, the angle between the outer surface of the second part (202b) of the expansion wall and the outer surface of the third part (202c) of the expansion wall is less than 90 degrees, and the angle gradually increases with inflation.

5. A framework for coating a cast pipe (5), suitable for cooperating with an inflatable rubber tire (2) according to any one of claims 1 to 4 to form a plugging device (1), the framework (3) comprising a receiving portion (31) defining a receiving space (4), the receiving space (4) comprising a fixing groove (313'), And among them, The accommodating portion (31) comprises: an L-shaped component (311) and a T-shaped component (312) connected to each other at one end, wherein the L-shaped component (311) extends beyond the T-shaped component (312) in the axial direction, and wherein the T-shaped component (312) comprises a first section (312a) connected to each other and extending substantially in the radial direction and a second section (312b) extending substantially in the axial direction, and a protrusion located on the second section (312b) and extending radially outward, wherein the protrusion defines an axial inner side surface of the fixing groove (313'); And wherein the first section (312a) of the T-shaped component (312) includes a first surface (312a1) extending substantially axially and a second surface (312a2) extending substantially radially, and its radial outer end is connected to the axial outer end of the first surface (312a1), and the second section (312b) of the T-shaped component (312) includes a first surface (312b1) extending substantially axially, and its axial inner end is connected to the radial inner end of the second surface (312a2) of the first section (312a), Furthermore, a through hole (316) that can communicate with the outside atmosphere is provided on the L-shaped part (311) of the frame (3), and at least one breathing hole (317) that can communicate with the outside atmosphere is provided on the T-shaped part (312) of the frame (3).

6. The skeleton according to claim 5, further comprising: A fender (32) connected to the receiving portion (31) is configured as a closed structure or has an opening for supplying a distribution pipe for injecting cement into the casting pipe (5).

7. A plugging device for coating a cast pipe (5), comprising: The inflatable tire (2) according to any one of claims 1 to 4 and the skeleton (3) according to any one of claims 5 to 6, 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 allow the inflation nozzle (26) of the inflatable tire (2) to pass therethrough, the fixing groove (313') is configured to be suitable for the fixing ring (206), the inflatable tire (2) has a first non-inflated state and a second inflated state, and wherein, Before inflation, the inflatable rubber tire (2) is in a first state, the rubber tire body (20) is fitted into the L-shaped part (311) of the frame (3), and defines an expansion cavity (41) between the rubber tire body (20) and the T-shaped part (312) of the frame (3), wherein the expansion cavity (41) defines a standardized expansion and contraction path of the inflatable rubber tire (2). When inflated, the tire body (20) expands, the first part (202a), the second part (202b) and the third part (202c) of the expansion wall (202) expand and deform along a second direction that is substantially axial, the fourth part (202d) of the expansion wall (202) and the fifth part (202e) of the expansion wall (202) expand and deform in a regular manner along a first direction that is axially and radially inward in the defined telescopic path until they are tightly fitted to the inner surface of the T-shaped component (312), and the inflatable tire (2) is in a second state, wherein the first direction refers to the axially inward and radially inward direction of the telescopic path defined by the expansion cavity (41), the second direction refers to the axially inward direction defined by the first surface (312a1) of the first section of the T-shaped component that extends substantially axially and has a taper of no more than 10° with the axis as the generatrix, and After deflation, the inflatable tire (2) returns to the first state, the tire body (20) retracts, the fourth part (202d) and the fifth part (202e) of the expansion wall (202) are separated from the T-shaped part (312) of the frame (3), and the expansion cavity (41) is re-formed.

8. The plugging device according to claim 7, wherein: In the second state, the third portion (202c) of the expansion wall fits tightly against the first surface (312a1) of the first section of the T-shaped component, the fourth portion (202d) of the expansion wall fits tightly against the second surface (312a2) of the first section of the T-shaped component, and the fifth portion (202e) of the expansion wall fits tightly against the first surface (312b1) of the second section of the skeleton.

9. The plugging device according to claim 7, wherein: The fixing ring (206) is further configured such that: when the inflatable rubber tire (2) is used in conjunction with the frame (3), the fixing ring (206) is fastened in the fixing groove (313') regardless of being in the first state or the second state.

10. The plugging device according to claim 7, wherein: In the uninflated state, the corner portion (A) pushes against the first surface (312a1) of the first section of the T-shaped component, and during the inflation process, the corner portion (A) slides along the first surface (312a1) of the first section of the T-shaped component and is guided, forcing the expansion wall (202) to deform.

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