JP5089730B2 - Seismic joint for manhole, its manufacturing method and mounting method - Google Patents

Description

  The present invention relates to an earthquake-resistant joint for manholes, a manufacturing method thereof, and an attaching method. More specifically, the present invention relates to an earthquake-resistant joint that connects a manhole and an embedded pipe, a manufacturing method thereof, and a method of attaching the earthquake-resistant joint to a manhole and an embedded pipe.

  Conventionally, the water stop treatment of the connecting portion between the manhole and the buried pipe has been performed by filling mortar or concrete. However, since mortar and concrete have a long curing time, a long time is required for construction. In addition, this method has a drawback that when an earthquake or ground subsidence occurs, a crack occurs in the connection portion, and leakage of sewage from the buried pipe or infiltration of groundwater into the buried pipe tends to occur.

  Therefore, in recent years, a flexible joint using a soft rubber material that can follow the displacement between the manhole and the buried pipe generated by an earthquake or ground subsidence has been proposed (for example, see Patent Document 1). For example, in the water-stopping flexible joint described in Patent Document 1, one end side is connected to the outer peripheral surface of the end portion of the tubular body by a band stopper, and the other end side is along the inner peripheral surface of the drilling hole opened in the peripheral wall of the manhole. It is fixed by an expansion band to be crimped.

  In the joint described in Patent Document 1, by extending the expansion band in the radial direction, the end of the flexible joint is pressed against the inner peripheral surface of the drilling hole of the manhole to stop water, and the other end is The tube is fastened and fixed with a band. Further, in this joint, in order to provide water tightness, a sealing material made of a butyl material or a water-swellable material is provided on the outer peripheral surface of the joint that is in contact with the drilling surface, and the water is crimped.

  On the other hand, for small manholes, flexible joints having a main body in a bellows shape have also been proposed (for example, see Patent Document 2). In the flexible joint described in Patent Document 2, it is easy to adjust the angle of the pipe by making the joint body bellows, and further, by providing a fin that closes the recess on the inner surface of the body, It is smooth.

  Furthermore, conventionally, a flexible joint provided with a bellows portion has been proposed as an earthquake-resistant joint (see, for example, Patent Documents 3 and 4). For example, in the joint described in Patent Document 3, a bellows portion is provided in a part of a flexible pipe joint used when connecting branch pipes to sewer pipes, in particular, branch pipes to a sewer main pipe. , To expand and contract in response to earthquake fluctuations.

  Further, in the connection structure described in Patent Document 4, a flexible joint made of an elastic body and provided with a cylindrical part and a bellows-like covering part, and a short pipe provided with a cylindrical crimping part and a tapered connection part. The mounting pipe is connected to the connection hole of the manhole through and. In this connection structure, the tube part of the flexible joint is inserted into the connection hole of the manhole, a short pipe is arranged inside, and a mounting pipe is inserted into the tapered connection part of the short pipe. In order to improve water tightness, earthquake resistance and sewage sulfidation.

JP 9-329277 A (Patent No. 3426435) JP 2001-90883 A JP-A-11-108280 JP 2002-038506 A

  However, the conventional techniques described above have the following problems. That is, in the water-stopping flexible joint described in Patent Document 1, in the event of an earthquake that causes a large shaking, the bands attached to the connecting portion between the flexible joint, the manhole body, and the tubular body are displaced. There is a problem that the tube body is easily detached from the manhole.

  In addition, the flexible joint described in Patent Document 2 is not directly connected to the manhole, but is incorporated in the middle of the drainage pipe so that the connecting portion between the pipes has flexibility, and the angle adjustment is facilitated. Is for. For this reason, this flexible joint has a problem that construction takes time. Furthermore, since the flexible joint described in Patent Document 2 has fins on the inner side, there is a problem that the structure is complicated and it is difficult to mold.

  On the other hand, although the joint described in Patent Document 3 is an earthquake-resistant joint, the saddle body connected to the sewage main pipe is formed of a material having no flexibility such as hard vinyl chloride, and therefore is inferior in earthquake resistance. There is a problem. In particular, in this joint, since the sewer main and the saddle body are fixed with an adhesive, if a large earthquake or ground subsidence occurs, a load is applied to this part, causing water leakage or infiltration of groundwater.

  Moreover, in the connection structure of patent document 4, since the manhole and the joint are fixed by crimping with a short pipe, the difference between the inner diameter of the connection hole provided in the manhole and the outer diameter of the short pipe is large. Then, there is a problem that the pressure bonding becomes insufficient and the mounting portion is loosened. On the contrary, if the size of the connection hole is small, a lubricant may be used when the short tube is inserted, but in this case, there is a problem that the short tube is easily pulled out when a pulling force is applied from the outside. In particular, when drilling is performed on site, the drilling size may be larger or smaller than planned, and such a connection structure is difficult to employ.

  Furthermore, in general, when manufacturing a flexible joint, a rubber joint body is formed by press molding using a mold, but as the diameter of the joint to be manufactured increases, the size of the mold also increases. Along with this, the molding pressure increases. For this reason, in the manufacture of a large-diameter joint, a great investment is required for equipment required for molding, and there is a problem that productivity is lower than that of a small-diameter joint.

  Therefore, the present invention mainly provides an earthquake-resistant joint for manholes, a method for manufacturing the same, and a method for attaching the same, which are excellent in water-stopping and earthquake resistance, and can be manufactured without reducing productivity even with large diameters. Objective.

The seismic joint for manhole according to the present invention is a joint for connecting a buried pipe having a diameter of 300 mm or more to a mounting hole drilled in the manhole body, and is inserted into the mounting hole, and is attached to the manhole body. A first annular portion to be fixed; a second annular portion in which the buried pipe is inserted and fixed to the buried pipe; and the manhole body provided between the first annular portion and the second annular portion. And an expansion / contraction part that is disposed outside the buried pipe and constitutes a flow path that communicates these, and the first annular part, the expansion / contraction part, and the second annular part are continuously and integrally formed. a formed cylindrical body, wherein the first annular portion, the recess for the water-swellable rubber attached to the outer surface, the recess for the extended band mounted on the inner surface are provided respectively, and said second annular The outer surface of the part is provided with a recess for attaching the tightening band. Ri, and extruded sheet material a tubular, and is formed by bonding the end surfaces facing each other.
In this invention, since the expansion-contraction part is provided between the 1st annular part and the 2nd annular part, it is excellent in earthquake resistance. Moreover, since it is fixed to the manhole and the buried pipe by the extension band and the tightening band, it is excellent in water-stopping and workability. Furthermore, since the sheet material is formed by cutting and bonding, the productivity is excellent.
In this earthquake-resistant joint, the outer diameter of the second annular portion may be smaller than the outer diameter of the first annular portion.
Moreover, the said expansion-contraction part can be made into the bellows structure in which the mountain fold and the valley fold were formed repeatedly, for example.
In that case, it is desirable that the expansion / contraction part can be extended by (L × 0.015) mm or more when the effective length of the buried pipe is L (mm).

Method of manufacturing a manhole for earthquake resistance joint according to the present invention, the mounting holes are drilled in the manhole body, a method of manufacturing a joint for diameter connecting more buried pipe 300 mm, by extrusion, A telescopic part is provided at the center in the width direction, a recess for mounting water-expandable rubber is provided on one side of one end, a recess for attaching an expansion band is provided on the other side, and tightened on one side of the other end A step of integrally forming a sheet material having a shape provided with a concave portion for attaching a band, a step of cutting the sheet material into a predetermined length, and the sheet material after cutting are attached to the water-expandable rubber the recess and the recess for the clamping band mounted on the outer surface side of the and towards the recess for extended band attached to the inner surface cylindrical, having a step of bonding the end surfaces facing each other, and the attachment hole Inserted and said manhole body A first annular portion to be fixed; a second annular portion in which the buried pipe is inserted and fixed to the buried pipe; and the manhole body provided between the first annular portion and the second annular portion. And the expansion / contraction part that is disposed outside the buried pipe and constitutes a flow path that communicates them, and the first annular part, the expansion / contraction part, and the second annular part are continuously and integrally formed. An earthquake-resistant joint of the formed cylindrical body is obtained.
In the present invention, a sheet material is formed by extrusion molding, and the end faces thereof are bonded to each other to form a substantially cylindrical joint. Therefore, the present invention is applicable to buried pipes having various calibers, and a conventional press Compared with molding, it is excellent in productivity.
In this production method, unvulcanized rubber can be extruded and the molded sheet material can be vulcanized.
Further, the end faces may be vulcanized and bonded.

The method for attaching an earthquake-resistant joint for manholes according to the present invention is provided on the outer surface of the first annular portion of a cylindrical earthquake-resistant joint having a first annular portion, a second annular portion, and a telescopic portion provided therebetween. After fitting the water-expandable rubber into the provided recess, the first annular portion is inserted into a mounting hole cut in the manhole body, and an extension band is attached to the recess provided on the inner surface of the first annular portion. Attaching and expanding the band to crimp and fix the first annular part in the attachment hole; and after inserting the end of the buried pipe into the second annular part, Attaching a tightening band to a recess provided on the outer surface, and fixing the second annular portion to the end of the buried pipe by tightening the band, and the expansion and contraction of the earthquake-resistant joint The part is arranged outside the manhole body and the buried pipe The manhole body and a flow path between the buried pipe through the earthquake resistance joint, communicating with the buried pipe and the manhole body.
In the present invention, since the manhole and the buried pipe are connected by the earthquake-resistant joint provided with the expansion and contraction part, the earthquake resistance and the water-stopping property are excellent. Moreover, since the expansion band is used for the connection with the manhole, even when drilled in the field, the connection work can be performed without reducing the water-stopping property.

  According to the present invention, the extruded sheet material is formed into a cylindrical shape, and the joints including the expansion and contraction portions are formed between the first annular portion and the second annular portion by bonding the opposing end surfaces to each other. Therefore, an earthquake-resistant joint excellent in water-stopping, earthquake resistance, and productivity can be obtained.

It is sectional drawing which shows the structure of the earthquake-resistant coupling of the 1st Embodiment of this invention. It is a partial cross section perspective view which shows the shape of the extruded sheet material. (A) And (b) is a perspective view which shows the method of manufacturing the earthquake-resistant coupling 10 shown in FIG. 1 from the sheet | seat material 20 shown in FIG. 2 in the order of the process. It is sectional drawing which shows the state which connected the manhole main body and the buried pipe with the earthquake-resistant coupling 10 shown in FIG. It is a perspective view which shows the method of fixing the earthquake-resistant coupling 10 to a manhole main body. It is a perspective view which shows the method of fixing the earthquake-resistant coupling 10 to a buried pipe.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. Note that the present invention is not limited to the embodiments described below.

  FIG. 1 is a cross-sectional view showing a configuration of a manhole seismic joint according to an embodiment of the present invention. The seismic joint for manholes of the present embodiment (hereinafter also simply referred to as seismic joint) is to connect a buried pipe having a diameter of 300 mm or more to the manhole body. As shown in FIG. An extendable part 3 is provided between the part 1 and the buried pipe side annular part 2.

[Manhole side annular part 1]
The manhole-side annular portion 1 is provided with a concave portion 5 for attaching an expansion band on the inner surface, and a concave portion 4 for attaching a water-expandable rubber at a position aligned with the concave portion 5 on the outer surface. In use, at least a portion where the recesses 4 and 5 are formed is inserted into an attachment hole provided in the manhole body and fixed from the inside by an extension band. Thus, by providing the recesses 4 and 5 at the position where the water-expandable rubber or the expansion band is mounted, it is possible to prevent the water-expandable rubber and the expansion band from being displaced or detached due to the shaking of the earthquake.

[Built-in pipe side annular part 2]
The buried pipe side annular portion 2 is provided with a recess 6 for attaching a fastening band on the outer surface, and when used, the buried pipe is inserted into the inside and fixed from the outside by the fastening band. Thus, by setting it as the structure which attaches a fastening band to the recessed part 6, it can prevent that a fastening band slips | deviates from a buried pipe by the shaking of an earthquake, or remove | deviates.

  Further, it is desirable that the inner surface of the buried pipe-side annular portion 2 is provided with a water-stopping projection 7 at least at a position aligned with the recess 6. Thereby, the water leak from a connection part can be prevented.

[Expandable part 3]
The expansion / contraction part 3 is a part that absorbs the shaking of the earthquake and the displacement of the ground and prevents the displacement and detachment from the manhole body and the buried pipe. For example, the expansion / contraction part 3 has a bellows structure in which mountain folds and valley folds are repeatedly formed. it can. At this time, the number of bellows folds (number of folds) can be appropriately selected according to the diameter, material, hardness, and the like of the joint, but is preferably at least 2 or more.

  The stretchable part 3 is preferably extendable by (L × 0.015) mm or more, where L (mm) is the effective length of the buried tube. As a result, even for level 2 earthquake motion, the permanent set of the ground can be absorbed, so that more excellent earthquake resistance can be obtained.

[Caliber]
The diameter of the earthquake-resistant joint 10 of this embodiment is not limited as long as a buried pipe having a diameter of 300 mm or more can be connected. For example, the inner diameter of the buried pipe-side annular portion 2 can be appropriately set according to the diameter of the buried pipe. it can. On the other hand, the outer diameter of the manhole-side annular portion 1 is desirably larger than the outer diameter of the buried pipe-side annular portion 2. Thereby, when attaching the earthquake-resistant joint 10 from the inside of a manhole through an attachment hole, a work can be performed more smoothly.

[Material]
Although the material which forms the earthquake-resistant joint 10 is not specifically limited, The rubber material excellent in the weather resistance and chemical resistance is suitable. Examples of such a rubber material include synthetic rubbers such as ethylene-propylene rubber (EPDM), chloroprene rubber (CR), and chlorosulfonated polyethylene (CSM). These rubber materials may contain a reinforcing agent such as carbon black, an inorganic filler, a softening agent, an anti-aging agent, a processing aid, a lubricant, a vulcanizing agent, and a vulcanization accelerator.

[Production method]
Next, the manufacturing method of the earthquake-resistant joint 10 of this embodiment is demonstrated. FIG. 2 is a partial cross-sectional perspective view showing the shape of the extruded sheet material. FIGS. 3A and 3B are perspective views showing a method of manufacturing the earthquake-resistant joint 10 shown in FIG. 1 from the sheet material 20 shown in FIG.

  The earthquake-resistant joint 10 of the present embodiment can be formed by forming the extruded sheet material 20 shown in FIG. 2 into a cylindrical shape and adhering opposing end surfaces. Specifically, first, it is extruded from a die of an extrusion molding machine, and an expansion / contraction part 3 is provided at the center in the width direction, a recess 4 for mounting a water-expandable rubber is provided on one surface of one end, and an expansion band is provided on the other surface. A sheet material 20 having a shape in which a concave portion 5 for mounting is provided and a concave portion 6 for tightening band mounting is provided on one surface of the other end portion is formed.

  When unvulcanized rubber is used as a raw material, the extruded sheet material 20 is then vulcanized. In that case, the method of vulcanization is not particularly limited, and a commonly used method can be applied. Specifically, (a) microwave vulcanization, (b) hot air vulcanization, (c) molten salt vulcanization and (d) heated can vulcanization can be applied, and these methods are used in combination. You can also

  For example, in the case of hot air vulcanization, a microwave vulcanizer and a hot air vulcanizer may be used in combination as a vulcanization tank. In this case, since the sheet material 20 can be heated from the inside by microwaves and the sheet material 20 can be heated from the outside by hot air, it is possible to vulcanize more efficiently by using these together. . Similarly, in the case of molten salt vulcanization, a microwave continuous vulcanizer and a molten salt vulcanizer can be used in combination as a vulcanization tank.

  The vulcanization conditions of the sheet material 20 are not particularly limited, and a conventionally known vulcanization accelerator or vulcanization aid can be used in combination.

  Next, the sheet material 20 is cut into a predetermined length in accordance with the size of the mounting hole of the manhole body and the pipe diameter of the buried tube, and thereafter, as shown in FIGS. 3 (a) and 3 (b) The material 20 is formed into a cylindrical shape, and opposite end surfaces are bonded to each other. The bonding method at that time is not particularly limited, and a method using an adhesive or the like can be applied, but vulcanization bonding is preferable from the viewpoint of bonding strength.

  Vulcanization adhesion is a method of vulcanization by heating and pressurizing in a state where unvulcanized rubber is filled or interposed on the adhesion surface of a vulcanized rubber sheet. In this vulcanization adhesion, it is desirable that the unvulcanized rubber used as an adhesive has the same composition as that of the sheet material 20 that is an adherend, and thus the end portions can be firmly bonded to each other. Also, before bonding, the adhesion surface can be improved by buffing the adhesion surface to remove dirt adhered to the rubber surface layer, increasing the area of the adhesion surface, and then vulcanizing and adhering. .

  This vulcanization adhesion can be performed using, for example, a press vulcanizer. At that time, the conditions for vulcanization adhesion can be bonded based on the vulcanization conditions of the unvulcanized rubber used as an adhesive, but the processing temperature is 150 to 170 ° C. and the processing time is 5 to 10 minutes. It is desirable to be. Thereby, since the unvulcanized rubber used as the adhesive is completely vulcanized, it can be integrated with the already vulcanized sheet material 20.

  Next, a method of using the earthquake-resistant joint 10 of the present embodiment, that is, a method of connecting the buried pipe to the manhole body using the earthquake-resistant joint 10 will be described. 4 is a cross-sectional view showing a state where the manhole body and the buried pipe are connected by the earthquake-resistant joint 10, FIG. 5 is a perspective view showing a method of fixing the earthquake-resistant joint 10 to the manhole body, and FIG. 6 is a earthquake-resistant joint. It is a perspective view which shows the method of fixing 10 to a buried pipe.

  As shown in FIG. 4, in the earthquake-resistant joint 10 of the present embodiment, first, water leakage due to fine uneven portions formed when the manhole is drilled in the recess 4 provided on the outer surface of the manhole-side annular portion 1. After fitting the water-expandable rubber 32 to prevent the manhole-side annular portion 1, the manhole-side annular portion 1 is inserted into a mounting hole cut in the manhole body 30. Then, as shown in FIG. 5, the extension band 33 is attached to the recess 5 provided on the inner surface of the manhole-side annular portion 1, and the extension band 33 is expanded using the extension jig 36. 10 is fixed to the manhole body 30 by pressure bonding.

  At this time, a spacer 35 made of stainless steel or the like may be disposed between the expansion pieces of the expansion band 33, that is, in a portion expanded by the expansion jig 36. Thereby, the expansion band 33 can be held in an expanded state.

  On the other hand, as shown in FIG. 6, the end portion of the embedded tube 31 is inserted into the embedded tube side annular portion 2, and the tightening band 34 is attached to the recessed portion 6 provided on the outer surface thereof. Then, by tightening the tightening band 34, the earthquake-resistant joint 10 is crimped to the buried pipe 31 and fixed. Thereby, the manhole body 30 and the buried pipe 32 communicate with each other via the earthquake-resistant joint 10. That is, the earthquake-resistant joint 10 constitutes a part of the flow path, and sewage flows through the inside thereof.

  As described in detail above, in the earthquake-resistant joint 10 of the present embodiment, since the expansion / contraction part 3 is provided between the manhole-side annular part 1 and the buried pipe-side annular part 2, ground distortion due to earthquake or ground subsidence is provided. Can be absorbed by the stretchable part 3. When this earthquake-resistant joint 10 is used, unlike the connection method described in Patent Document 4, a hard short pipe is not used, and the buried pipe is connected only through a flexible joint. It is possible to prevent displacement and disconnection of the connecting portion even for a large-scale earthquake with a large ground distortion.

  Moreover, in the earthquake-resistant joint 10 of this embodiment, since the groove | channel (recessed part 4,5,6) is provided in the position which mounts the water expansible rubber 32, the expansion band 33, and the fastening band 34, an earthquake and ground subsidence are carried out. When they occur, they can be prevented from shifting or coming off. With these configurations, the earthquake-resistant joint according to the present embodiment can obtain better earthquake resistance and water-stopping performance than before.

  Furthermore, since the earthquake-resistant joint 10 of the present embodiment is fixed to the manhole body 30 by crimping with the extension band 33 from the inside, even if the size of the mounting hole varies, the degree of tightening of the extension band 33 By adjusting, it is possible to prevent deterioration of the water stop performance. Thus, the earthquake-resistant joint 10 of this embodiment is excellent in workability.

  Furthermore, since the earthquake-resistant joint 10 of the present embodiment can be manufactured by cutting the sheet material 20 and adhering the ends so as to form a cylinder, it can be used for various diameters. Even a large-diameter product can be manufactured with high productivity. As described above, according to the present invention, it is possible to obtain an earthquake-resistant joint for manholes which is superior in water-stopping and earthquake resistance as compared with the conventional art and can be manufactured without reducing productivity even with a large diameter.

DESCRIPTION OF SYMBOLS 1 Manhole side cyclic | annular part 2 Buried pipe side cyclic | annular part 3 Expansion / contraction part 4, 5, 6 Concave part 7 Protrusion 10 Seismic joint 20 Sheet material 30 Manhole main body 31 Buried pipe 32 Water expansible rubber 33 Expansion band 34 Tightening band 35 Spacer 36 Expansion jig

Claims (8)

A joint for connecting a buried pipe having a diameter of 300 mm or more to a mounting hole drilled in the manhole body,
A first annular portion inserted into the mounting hole and fixed to the manhole body;
A second annular portion inserted into the buried pipe and fixed to the buried pipe;
An expansion / contraction part provided between the first annular part and the second annular part and disposed outside the manhole body and the buried pipe and constituting a flow path communicating the manhole body and the buried pipe And having
A cylindrical body in which the first annular portion, the stretchable portion and the second annular portion are continuously formed;
The first annular portion is provided with a recess for mounting a water-expandable rubber on the outer surface and a recess for mounting an expansion band on the inner surface,
And the recessed part for fastening band attachment is provided in the outer surface of the said 2nd annular part,
The extruded sheet material and cylindrical, Ma Nhoru for earthquake resistance joint formed by bonding end surfaces facing each other.   The seismic joint for manhole according to claim 1, wherein an outer diameter of the second annular portion is smaller than an outer diameter of the first annular portion.   The earthquake-resistant joint for manholes according to claim 1 or 2, wherein the stretchable portion has a bellows structure in which mountain folds and valley folds are repeatedly formed.   The earthquake-resistant joint for manholes according to claim 3, wherein the expansion / contraction part can extend (L x 0.015) mm or more when the effective length of the buried pipe is L (mm). . A method of manufacturing a joint for connecting a buried pipe having a diameter of 300 mm or more to a mounting hole drilled in a manhole body,
By extrusion molding , a stretchable part is provided at the center in the width direction, a recess for mounting a water-expandable rubber is provided on one surface of one end, and a recess for mounting an expansion band is provided on the other side, and the other end A step of integrally forming a sheet material having a shape provided with a concave portion for mounting a fastening band on one surface;
Cutting the sheet material into a predetermined length;
The sheet material after cutting is cylindrical with the concave portion for mounting the water-expandable rubber and the concave portion for mounting the fastening band on the outer surface side, and the concave portion for mounting the expansion band on the inner surface side. Adhering
A first annular portion inserted into the mounting hole and fixed to the manhole body; a second annular portion into which the buried pipe is inserted and fixed to the buried pipe; the first annular portion and the second annular portion; The first annular portion provided between the manhole main body and the buried pipe, and the expansion and contraction portion constituting a flow path communicating the manhole main body and the buried pipe. The manufacturing method of the earthquake-resistant joint for manholes which obtains the cylindrical earthquake-resistant joint in which the said expansion-contraction part and the said 2nd annular part were formed continuously .   6. The method for producing an earthquake-resistant joint for manholes according to claim 5, wherein unvulcanized rubber is extruded and the molded sheet material is vulcanized.   The method for producing an earthquake-resistant joint for manholes according to claim 5 or 6, wherein the end faces are vulcanized and bonded together. After fitting the water-expandable rubber into the concave portion provided on the outer surface of the first annular portion of the cylindrical earthquake-resistant joint provided with the first annular portion, the second annular portion, and the stretchable portion provided therebetween. The first annular portion is inserted into a mounting hole cut in the manhole body, an extension band is attached to a recess provided on the inner surface of the first annular portion, and the band is expanded to thereby expand the first annular portion. Crimping and fixing the part to the mounting hole;
After inserting the end portion of the buried pipe into the second annular portion of the earthquake-resistant joint , a fastening band is attached to a recess provided on the outer surface of the second annular portion, and the second annular portion is tightened by tightening the band. And crimping and fixing the part to the buried pipe end,
The expansion / contraction part of the earthquake-resistant joint is disposed outside the manhole body and the buried pipe to form a flow path between the manhole body and the buried pipe, and the manhole body via the earthquake-resistant joint. A method for attaching a seismic joint for manholes to communicate with the buried pipe.

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