TW201500619A - Sheath conduit structure - Google Patents

Abstract

The purpose of the present invention is, in a sheath conduit in which a PC steel member is inserted and that is filled with grout, to prevent corrosion of the PC steel member caused by bleed water by isolating the bleed water, which is produced inside the conduit when the grout cures, or allowing the same to escape. This sheath conduit (1) comprises connection sites (12) where ends of sheaths (10) are coupled and fixed via a joint member (11). In the connection site (12), a connecting tube (21) of the joint member (11) is fit around and fixed to the end of the sheath (10) by screwing together a ridge (15) of the sheath (10) and a projection (25) of the joint member (11) while the outer peripheral face (16) of the ridge (15) and the inner circumferential face (26) of the projection (25) are in partial contact with each other, and a water discharge channel (30) for guiding bleed water, which is produced inside the conduit when grout (4) cures, to the exterior of the conduit is formed between the end of the sheaths (10) and the connecting tubes (21) of the joint members (11).

Description

Casing pipe structure

The present invention relates to a casing pipe structure embedded in a concrete structure such as a PC beam bridge, in which a PC steel for introducing a pre-stress to the concrete structure is inserted. Also, the inside of the casing pipe is filled with cement slurry.

In general, in the case of a construction of a prestressed concrete structure such as a PC girder bridge manufactured by a post-tension method, a casing pipe is buried in the concrete structure to tension the PC steel inserted in the pipe. Thereby, the compressive force (prestress) as its reaction force is introduced into the concrete structure. Then, a cement slurry which is a mixture of silicate cement, water, a mixture, and the like is filled in a pipe through which PC steel is inserted, and is hardened to protect the PC steel from corrosion.

When filling the cement slurry, it is necessary to densely fill the pipe without a gap. For example, if air is left in the pipeline and the air remains in the unfilled portion of the pipe, dew condensation occurs in this portion, which constitutes a major cause of corrosion of the PC steel, and the strength of the concrete structure is lowered.

For this reason, it has been proposed to have a structure in which the ends of the sleeve are connected and fixed by a joint member having a discharge cylinder, and the exhaust pipe is connected to the exhaust pipe of the joint member. The air is discharged to the outside of the pipe (for example, refer to Patent Document 1). In addition, it is proposed Structure: The ends of the sleeve are connected and fixed by a joint member with a sensor, and the filling condition (with or without residual air) in the pipeline is confirmed by the sensor of the joint member ( For example, refer to Patent Document 2).

Prior art document patent document

Patent Document 1: Japanese Laid-Open Patent Publication No. 2003-321900

Patent Document 2: Japanese Laid-Open Patent Publication No. 2005-188101

As described above, various measures have been taken for the air remaining in the pipe when the cement slurry is filled, but the main cause of the corrosion of the PC steel is the bleeding generated in the pipe when the cement slurry is hardened. That is, the bleeding water remaining in the pipeline is in direct contact with the PC steel, or the condensation generated in the void portion after the bleeding is evaporated and the PC steel is in contact with it, causing corrosion of the PC steel, thereby causing a decrease in the strength of the concrete structure. . However, the current situation is that no countermeasures have been taken for such bleeding in the pipeline when the cement slurry is hardened.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for suppressing corrosion of PC steel caused by bleeding when the bleeding slurry generated in the pipeline is hardened or the bleeding water is isolated during the hardening of the cement slurry.

The casing pipe structure of the invention is characterized in that the casing pipe 1 is embedded in the concrete structure 2, in which the PC steel 3 for introducing prestressing force into the concrete structure 2 is inserted. And the inside of the casing pipe 1 is filled with a cement slurry 4, and the casing pipe 1 is provided with a connection The connecting portion 12 is formed by connecting and fixing the ends of the sleeve 10 through the joint member 11, and the sleeve 10 is a spiral bellows, and the spiral bellows is bulged in a radially outward direction. The ridges 15 are spirally formed at equal pitches in the axial direction, and both end portions of the joint member 11 have a connecting tubular portion 21, and the ridges 25 of the connecting tubular portion 21 that bulge in the radially outward direction are equidistant in the axial direction. The top surface has a spiral shape, and an axial cross-sectional shape of the outer peripheral surface 16 of the ridge 15 is different from an axial cross-sectional shape of the inner peripheral surface 26 of the ridge 25 at the joint portion 12, the ridge The outer peripheral surface 16 of the portion 15 is partially in contact with the inner peripheral surface 26 of the ridge 25, and the rib 15 is screwed with the ridge 25 to externally engage the connecting tubular portion 21 of the joint member 11. Attached to the end of the sleeve 10, a drainage path 30 is formed between the end of the sleeve 10 and the connecting barrel portion 21 of the joint member 11, the drain path 30 being used to harden the cement slurry 4 The bleeding generated in the pipeline is guided outside the pipeline.

In addition, another casing pipe structure of the present invention is characterized in that the casing pipe 1 Embedded in the concrete structure 2, in which the PC steel 3 for introducing prestressing force into the concrete structure 2 is inserted, and the inside of the casing pipe 1 is filled with the cement slurry 4, The casing line 1 is provided with a connecting portion 12 which is connected and fixed to the ends of the sleeve 10 by a joint member 11, which is a spiral bellows, the spiral bellows The ridges 15 bulging in the radially outward direction are spirally formed in the axial direction with equal pitch, and the joint members 11 have connecting barrel portions 21 at both ends thereof, and bulge in the radially outward direction of the connecting barrel portion 21 The ridge 25 is spirally formed in an axially equal pitch, and the axial cross-sectional shape of the outer peripheral surface 16 of the ridge 15 is different from the axial cross-sectional shape of the inner peripheral surface 26 of the ridge 25 in the axial direction. The connecting portion 12, the outer peripheral surface 16 of the rib 15 is partially in contact with the inner peripheral surface 26 of the rib 25, and the rib 15 is screwed with the ridge 25 to thereby join the joint The connecting barrel portion 21 of the member 11 is externally fixed to An isolation space 31 is formed between the end of the sleeve 10 and the connecting cylinder portion 21 of the joint member 11 at the end of the sleeve 10, and the partition space 31 is used for the tube when the cement slurry 4 is hardened. The bleeding produced in the road is isolated.

In addition, an angle along the spiral direction is formed on the outer peripheral surface 16 of the ridge 15 The portion 16c at the joint portion 12, the corner portion 16c of the rib 15 is in line contact with the inner peripheral surface 26 of the ridge 25, and the rib 15 is screwed with the ridge 25 .

Further, the casing pipe 1 is buried in a meandering state in the up and down direction. In the concrete structure 2, the connection portion 12 is provided in the vicinity of at least the top 1a of the casing pipe 1. Further, a confirmation member for confirming the filling state of the cement slurry 4 is provided in the intermediate portion 20 of the joint member 11, and the confirmation member is for discharging the air in the pipeline to the outside of the pipeline. Any of the exhaust cylinders 40, 41, the sensor 50 for detecting the presence or absence of residual air in the pipeline, the insertion cylinder 60 for inserting a camera for photographing the state inside the pipeline, or by their Combined composition.

According to the casing pipe structure of the present invention, since the drainage path is formed at the joint portion which is connected and fixed to the end portion of the sleeve through the joint member, it is possible to pass through the drain passage in the pipeline when the cement slurry is hardened. The generated bleeding water is discharged to the outside of the pipeline, and corrosion of the PC steel material due to bleeding can be suppressed, and the strength of the concrete structure can be maintained well for a long period of time.

Further, according to another bushing pipe structure of the present invention, since the space is formed at the joint portion where the joint between the ends of the bushing is fixed by the joint member, the pressure of the cement slurry before hardening is When the cement slurry is hardened, the bleeding water generated in the pipeline is pressed outside the pipeline to be located (inflow) into the isolation space, thereby inhibiting direct contact between the bleeding water and the PC steel. As a result, corrosion of the PC steel material due to bleeding can be suppressed, and the strength of the concrete structure can be favorably maintained for a long period of time.

Moreover, when forming a drain or isolation space, it is only ensured in the casing The end portion and the connecting tubular portion of the joint member to which the fitting is attached and formed form a gap between the drainage path and the isolation space, and a special mechanism and a dedicated member are not required, and the structure can be simplified.

In addition, by connecting the outer peripheral surface of the rib of the end of the sleeve to the joint member The inner peripheral faces of the ridges of the tubular portion are partially in contact with each other, and the ribs are screwed with the ridges, thereby ensuring drainage between the end portion of the sleeve and the connecting barrel portion of the joint member to which the outer fitting is fixed. The gap between the road and the isolated space. Therefore, the connecting barrel portion of the joint member can be externally fitted and fixed to the end portion of the sleeve in a stable state (without obstructing the external fitting), and at the same time, the drainage path and the isolation space are formed, and since the ribs and the protrusions are screwed at the thread Since the frictional resistance at the time is small, the operability at the time of external fitting and fixing can be improved, and it is easy to connect and fix the end portions of the sleeve by the joint member.

In addition, when the thread is screwed into the ridge and the ridge, the corner of the ridge and the ridge are made The inner circumferential surface is in contact with each other, so that the drainage path and the isolation space can be reliably formed, and the frictional resistance can be further reduced, thereby improving the operability at the time of external fixation.

In addition, by at least the top of the casing line that travels in the up and down direction A connection portion where the drainage path and the isolation space are formed is provided in the vicinity, so that the bleeding which is likely to collect near the top of the casing pipe can be efficiently captured and discharged to the outside of the pipe or placed in the isolation space.

In addition, by placing various functional components in the middle of the joint member, residual By implementing countermeasures against the air in the piping, corrosion of the PC steel material can be reliably prevented, and reliability can be improved.

1‧‧‧ casing line

1a‧‧‧near the top of the casing line

1b‧‧‧near the slope of the casing line

1c‧‧‧near the bottom of the casing line

2‧‧‧Concrete structure

3‧‧‧PC steel

4‧‧‧Cement slurry

10‧‧‧ casing

11‧‧‧Connector parts

12‧‧‧Connecting parts

15‧‧ ‧ ribs

16‧‧‧The outer perimeter of the rib

16a‧‧‧Outer top

16b‧‧‧Outside

16c‧‧‧ corner

17‧‧‧Outer bottom

20‧‧‧Intermediate part of the joint part

21‧‧‧Connected tube

22‧‧‧Cone face

25‧‧‧

26‧‧‧ Inner circumference of the ridge

Top surface within 26a‧‧

26b‧‧‧ inside

27‧‧‧ inside bottom

30‧‧‧Drainage road

31‧‧‧Isolated space

40‧‧‧Exhaust

41‧‧‧Exhaust

42‧‧‧Protruding

50‧‧‧ sensor

60‧‧‧insert tube

61‧‧‧Protruding

70‧‧‧Closed parts

Fig. 1 is a longitudinal sectional view showing a structure of a casing pipe according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of a joint portion.

Fig. 3 is a longitudinal sectional view of a main part of a joint portion.

Fig. 4 is a front elevational view showing the sleeve and the joint member.

Fig. 5 is a front elevational view showing a joint member having an exhaust cylinder.

Fig. 6 is a front elevational view showing a joint member having an exhaust cylinder.

Fig. 7 is a front elevational view showing a joint member having a sensor.

Fig. 8 is a front elevational view showing a joint member having an insertion cylinder.

Fig. 9 is a longitudinal sectional view of a main part of a connecting member in a casing piping structure of another embodiment.

Fig. 10 is a longitudinal sectional view showing a main part of a connecting member in a casing piping structure of still another embodiment.

Hereinafter, embodiments of the invention will be described in detail with reference to the drawings. The casing pipe structure of one embodiment of the invention is applicable to construction of a prestressed concrete structure such as a PC girder bridge manufactured by a post-tension method.

As shown in FIG. 1 and FIG. 2, the casing pipe 1 is embedded in the concrete structure 2, and a PC steel 3 for introducing a pre-stress to the concrete structure 2 is inserted into the casing pipe 1 and Further, the inside of the casing line 1 is filled with the cement slurry 4. Further, as the cement slurry 4, a general cement slurry composed of a mixture of silicate cement, water, a mixture, or the like is used.

The casing pipe 1 is embedded in the concrete in a meandering direction in the up and down direction. In the structure 2, a connection portion 12 is provided in the vicinity 1a of the top of the casing pipe 1, and the connection portion 12 is connected and fixed to the ends of the casing 10 by the joint member 11. Then, at the joint portion 12, measures for discharging the bleeding water generated in the pipe when the cement slurry 4 is hardened are discharged to the outside of the pipe. Further, the joint portion 12 may be provided not only in the vicinity of the top portion 1a of the casing pipe 1, but also in the vicinity of the inclined portion 1b between the top vicinity 1a and the bottom portion 1c, or may be provided in the vicinity of the bottom portion 1c.

As shown in FIG. 2 and FIG. 4, the sleeve 10 is a spiral corrugated tube made of polyethylene resin. The rib 15 which is bulged in the radially outer direction of the spiral bellows is spirally formed in the axial direction at the same pitch. Further, the material of the sleeve 10 is not necessarily limited to a polyethylene resin, and may be another synthetic resin.

As shown in FIG. 3, the outer peripheral surface 16 of the rib 15 of the sleeve 10 includes: along the axial direction a flat outer peripheral surface 16a having a narrow width; and a pair of outer portions extending in a radially inward direction from both end portions in the longitudinal direction (spiral direction) of the outer top surface 16a Side 16b. A continuous state is formed between the outer peripheral faces 16 of the ridges 15 adjacent in the axial direction by a flat outer bottom surface 17 in the axial direction. Further, the cross-sectional shape of the ridge 15 in the axial direction is uniform over the entire length direction (spiral direction).

The joint member 11 is made of polyethylene resin, as shown in Fig. 2 and Fig. 4, the joint portion The intermediate portion 20 of the member 11 is formed in a substantially straight cylindrical shape, and both end portions of the joint member 11 are spiral corrugated connecting tubular portions 21 that are externally fitted and fixed to the end portion of the sleeve 10, and the intermediate portion 20 and the connecting tubular portion 21 are tapered. The face 22 is connected. In addition, the raw material of the joint member 11 is not limited to a polyethylene resin. So other synthetic resins.

On the connecting cylinder portion 21 of the joint member 11, a bulging bulging in the radially outward direction 25 is helical in shape in the axial direction. The ridges 25 of the connecting cylinder portion 21 are formed at substantially the same pitch as the ribs 15 of the sleeve 10 to allow the ridges 15 to enter the inside thereof. As shown in FIG. 3, the inner peripheral surface 26 of the ridge 25 includes: a flat inner width surface 26a having a wide width along the axial direction; and, from the length direction (spiral direction) along the inner top surface 26a. The state in which both end portions are expanded in the radially inward direction extends the pair of inner side faces 26b. The inner peripheral surface 26 of the ridges 25 adjacent in the axial direction forms a continuous state by the inner bottom surface 27, and the inner bottom surface 27 projects in the radial direction and is curved. Further, the cross-sectional shape of the ridge 25 in the axial direction is uniform over the entire length direction (spiral direction).

Comparing the ridge 15 of the sleeve 10 with the ridge 25 of the joint member 11, the rib 15 The cross-sectional shape of the outer peripheral surface 16 in the axial direction is different from the cross-sectional shape of the inner peripheral surface 26 of the ridge 25 in the axial direction. Specifically, the outer top surface 16a of the rib 15 is narrower than the inner top surface 26a of the ridge 25, and the angle of the outer side surface 16b of the rib 15 with respect to the axial direction (about 45 degrees) is larger than the inner side of the ridge 25 The angle of 26b with respect to the axial direction (about 60 degrees) is small.

Moreover, as shown in FIG. 2, at the joint portion 12, by making the sleeve 10 convex The strip 15 is screwed with the ridge 25 of the joint member 11 to press the tip end portion of the sleeve 10 onto the tapered surface portion 22 of the joint member 11, thereby fitting the joint barrel portion 21 of the joint member 11 to the sleeve 10 On the end.

In this case, because of the axial cross-sectional shape of the outer peripheral surface 16 of the rib 15 Since the axial cross-sectional shapes of the inner circumferential surfaces 26 of the strips 25 are different from each other, they do not overlap each other but form a state of partial contact. Therefore, the ends of the sleeve 10 are stabilized by the joint member 11 The state connection is fixed, and a gap continuous in the spiral direction is ensured between the end of the sleeve 10 and the connecting cylinder portion 21 of the joint member 11. Further, the gap which is continuous in the spiral direction constitutes a drain path 30 for guiding the bleeding generated in the pipe when the grout 4 is hardened to the outside of the pipe.

Generally, when the cement slurry 4 is filled into the casing line 1, it is pressurized by a pump or the like. The cement slurry 4 is injected into the pipeline. After the cement slurry 4 is injected, the pressurization of the pump or the like is released, but the cement slurry 4 in the pressurized state in the pipeline is filled and maintained at a high pressure (one atmosphere or more). When the cement slurry 4 is hardened, if bleeding occurs in the pipeline, the bleeding water is discharged from the pipeline maintained in the high pressure through the drainage passage 30 to the pipeline. Thereby, corrosion of the PC steel material 3 by bleeding can be suppressed, and the strength of the concrete structure 2 can be maintained favorably for a long period of time.

5 to 8 show a modification of the joint member 11. In the middle of these joint parts 11 The functional portion 20 is provided with various functional portions as members for confirming the filling condition of the cement slurry 4. Further, these are examples, and for example, the joint member 11 having various functional parts in combination may be used.

The intermediate portion 20 of the joint member 11 shown in Figs. 5 and 6 is provided with a protruding portion As the exhaust pipes 40 and 41 of the functional parts, the exhaust pipe connected to the exhaust pipes 40 and 41 can discharge the air remaining in the pipe when the grout 4 is filled to the outside of the pipe.

In addition, in the joint member 11 shown in FIG. 5, the intermediate portion 20 of the joint member 11 A projection 42 projecting in the radially inward direction is formed between the connecting cylinder portion 21, and the tip end portion of the sleeve 10 is in a state in which the connecting cylinder portion 21 of the joint member 11 is externally fitted and fixed to the end portion of the sleeve 10. It is pressed against the projection 42 of the joint member 11.

In addition, the diameter of the left and right connecting cylinders 21 of the joint member 11 shown in Fig. 6 is not Similarly, the intermediate portion 20 that connects them is formed into a tapered shape, and the connecting tubular portion of the joint member 11 is formed. The tip end portion of the sleeve 10 is pressed against the intermediate portion 20 of the joint member 11 in a state where the outer fitting is fixed to the end of the sleeve 10.

A sensor 50 as a functional portion is mounted on the intermediate portion 20 of the joint member 11 shown in Fig. 7, and the sensor 50 can detect the presence or absence of residual air in the conduit.

An insertion tube 60 as a functional portion is protruded from the intermediate portion 20 of the joint member 11 shown in Fig. 8, and a small camera such as a CCD camera is inserted into the insertion tube 60, whereby the state inside the tube can be imaged. Further, the joint member 11 is formed with a projection 61 projecting in the radially inward direction between the intermediate portion 20 and the connection cylinder portion 21, and is externally fitted and fixed to the end portion of the sleeve 10 at the joint cylinder portion 21 of the joint member 11. In the upper state, the tip end portion of the sleeve 10 is pressed against the projection 61 of the joint member 11.

Fig. 9 shows the main part of the joint portion 12 of the casing pipe structure of the other embodiment. In the casing pipe structure, the shape of the inner circumferential surface 26 of the ridge 25 on the side of the joint member 11 is different from that of the embodiment shown in Fig. 3 described above. In other words, the cross-sectional shape of the inner circumferential surface 26 of the ridge 25 on the joint member 11 side in the axial direction is formed in a substantially arc shape. Further, in a state in which the connecting tubular portion 21 of the joint member 11 is externally fitted and fixed to the end portion of the sleeve 10, the corner portion 16c of the ridge 15 (the boundary between the outer top surface 16a and the outer side surface 16b of the outer peripheral surface 16) Partly) is in line contact with the inner peripheral surface 26 of the ridge 25, and the rib 15 is screwed with the ridge 25, and is formed in the spiral direction between the end of the sleeve 10 and the connecting cylinder portion 21 of the joint member 11. Continuous drainage path 30. In addition, other structures are the same as those of the embodiment shown in FIG.

Figure 10 shows the main part of the joint 12 of the casing pipe structure of yet another embodiment. In the casing pipe structure, at the end portion of the connecting cylinder portion 21 of the connecting member 11, the connecting portion of the sleeve 10 and the joint portion 11 of the joint member 11 is passed through the closing member 70 of a plastic tape or the like. The opening portion of the gap (drainage path 30) is closed, and the gap is different from the casing pipe structure of the above embodiment in that the gap is used as the isolation space 31 for moving the bleeding water and isolating the bleeding water. .

The above-mentioned isolation space 31 is open to the inside of the pipeline and seals the end of the pipeline outside. The closed spiral shape space is therefore not filled by the high viscosity cement slurry 4, and only the low viscosity bleeding water is pressurized from the pipeline to the pipeline maintained in the high pressure by injecting the cement slurry under pressure. It is located in (inflow) to the isolated space 31. Therefore, similarly to the above-described embodiment, it is possible to suppress corrosion of the PC steel material 3 caused by bleeding, and it is possible to maintain the strength of the concrete structure 2 well for a long period of time. In addition, other structures are the same as those of the embodiment shown in FIG. Further, the above configuration can also be applied to the embodiment shown in FIG. 4, and the same operational effects can be obtained.

The present invention is not limited to the above embodiment, and can of course be within the scope of the present invention. Various modifications and changes are made to the above embodiments.

For example, as the outer peripheral surface 16 of the rib 15 on the side of the sleeve 10 and/or the joint portion The inner peripheral surface 26 of the ridge 25 on the side of the piece 11 has a shape in which the outer peripheral surface 16 of the ridge 15 and the inner peripheral surface 26 of the ridge 25 are different from each other, and when the ridge 15 and the ridge 25 are screwed together, The outer peripheral surface 16 of the ridge 15 is in partial contact with the inner peripheral surface 26 of the ridge 25, and a drainage path 30 continuous in the spiral direction is formed between the end of the sleeve 10 and the connecting cylinder 21 of the joint member 11 or The isolated space 31 may have a shape other than the above embodiment. Further, the tapered surface portion 22 of the above embodiment can realize the function of allowing the rotation of the joint member 11 (idling) and suppressing the sleeve before the outer peripheral surface 16 of the ridge 15 comes into contact with the inner peripheral surface 26 of the ridge 25 The tip end portion of 10 is excessively screwed into the joint member 11. However, it is not necessarily limited to a tapered surface, and may be replaced by a protrusion or the like.

2‧‧‧Concrete structure

3‧‧‧PC steel

4‧‧‧Cement slurry

10‧‧‧ casing

11‧‧‧Connector parts

12‧‧‧Connecting parts

15‧‧ ‧ ribs

20‧‧‧Intermediate part of the joint part

21‧‧‧Connected tube

22‧‧‧Cone face

25‧‧‧

30‧‧‧Drainage road

Claims (6)

A casing pipe structure in which a casing pipe (1) is embedded in a concrete structure (2), and a prestressing force is introduced into the casing pipe (1) for introducing the concrete structure (2) PC steel (3), and the inside of the casing pipe (1) is filled with a cement slurry (4), which is characterized in that a connection portion is provided in the casing pipe (1) (12) The connecting portion (12) is formed by connecting and connecting the ends of the sleeve (10) through the joint member (11), the sleeve (10) is a spiral bellows, and the radial diameter of the spiral bellows The ribs (15) bulging in the outward direction are spirally formed in the axial direction with equal pitch, and the joint portions (11) have connecting barrel portions (21) at the both ends thereof, and the diameter of the connecting barrel portions (21) The ridge (25) bulging in the outward direction is spirally formed in the axial direction, and the axial cross-sectional shape of the outer peripheral surface (16) of the rib (15) and the inside of the ridge (25) The axial cross-sectional shape of the circumferential surface (26) is different, and at the joint portion (12), the outer peripheral surface (16) of the ridge (15) and the inner peripheral surface (26) of the ridge (25) Partially in contact, and the rib (15) and the ridge (25) are snail Rotating so that the connecting barrel portion (21) of the joint member (11) is externally fixed on the end of the sleeve (10) at the end of the sleeve (10) and the joint member (11) A drainage path (30) is formed between the connection cylinders (21) for guiding the bleeding generated in the pipeline when the cement slurry (4) is hardened to the outside of the pipeline. A casing pipe structure in which a casing pipe (1) is embedded in a concrete structure (2), and a prestressing force is introduced into the casing pipe (1) for introducing the concrete structure (2) PC steel (3), and the inside of the casing pipe (1) is filled with a cement slurry (4), which is characterized in that a connection portion is provided in the casing pipe (1) (12) The connecting portion (12) is formed by connecting and connecting the ends of the sleeve (10) through the joint member (11), the sleeve (10) is a spiral bellows, and the radial diameter of the spiral bellows The ridges (15) bulging in the outward direction are spirally formed in the axial direction, and the joint members (11) have connecting barrel portions (21) at the both ends thereof, and the direction of the connecting barrel portions (21) a bulge (25) bulging in a radially outer direction is spirally formed in an axially equal pitch, an axial cross-sectional shape of the outer peripheral surface (16) of the rib (15) and the ridge (25) The axial cross-sectional shape of the inner peripheral surface (26) is different, and at the joint portion (12), the outer peripheral surface (16) of the ridge (15) and the inner peripheral surface of the ridge (25) (26) Partially contacting, and the rib (15) is screwed with the ridge (25) to externally fix the connecting barrel portion (21) of the joint member (11) to the sleeve ( At the end of 10), at the end of these sleeves (10) and the joint part (11) An isolation space (31) is formed between the joint portions (21) for isolating the bleeding generated in the pipeline when the cement slurry (4) is hardened. The casing pipe structure according to claim 1 or 2, characterized in that a corner portion (16c) along a spiral direction is formed on an outer peripheral surface (16) of the ridge (15), a connecting portion (12), a corner portion (16c) of the rib (15) is in line contact with an inner peripheral surface (26) of the ridge (25), and the rib (15) and the ridge (25) Thread screwing. The casing pipe structure according to any one of claims 1 to 3, characterized in that the casing pipe (1) is embedded in the concrete structure in a meandering state in the up and down direction (2) The connecting portion (12) is provided in the vicinity of at least the top of the casing line (1) (1a). The casing pipe structure according to any one of claims 1 to 4, characterized in that, in the intermediate portion (20) of the joint member (11), a confirmation member is provided, the confirmation member facing the cement slurry (4) The filling status is confirmed. The casing pipe structure according to claim 5, characterized in that the confirmation member is an exhaust pipe (40) (41) for discharging air in the pipe to the outside of the pipe, for detecting the pipe A sensor (50) having residual air in the road, an insertion cylinder (60) for inserting a camera for photographing a state in the pipeline, or a combination thereof.