JP4448816B2 - Concrete pipe and propulsion method - Google Patents

Description

  The present invention relates to a concrete pipe used for constructing pipes in the ground and a propulsion method for constructing pipes in the ground.

  As a method for constructing a pipe rod in the ground, a propulsion method is known in which excavation is carried out while pushing the propulsion rod laterally into the ground from a vertical shaft erected in the ground. This is because a concrete pipe manufactured to a predetermined length at the factory is pushed in while being connected to the rear end of the propulsion pipe pushed in first, thereby constructing a pipe with the required length. It is going.

  Conventionally, most pipes constructed by such a propulsion method have a diameter of about 3 m or less. This is due to the fact that transportation becomes difficult when the diameter of the pipe body constructed at the factory and transported to the site exceeds 3 m. However, with the widespread use of common grooves in urban areas, it has become necessary to construct large-diameter pipes with the propulsion method. Therefore, it has been proposed to form a concrete segment having a shape obtained by dividing the tubular body into two in the circumferential direction, and to assemble these two halved concrete segments into a tubular body (see, for example, Patent Document 1). ). The concrete segment thus divided can be transported by a trailer or the like even if it has a large diameter.

In addition, in pipes constructed in the ground, it is often necessary to connect other pipes from the middle of the pipes, but it is difficult to connect other pipes directly to the pipes. Then, an underground structure such as a human hole (standing hole) is provided, and the underground structure is opened to connect the pipe with the propelling pipe to other pipes.
Therefore, in connecting pipes and other pipes, an underground structure is provided for connection, and by connecting through the underground structure, pipes made of steel with a large-diameter propulsion pipe are used. Requires a long construction period and high costs.

  Therefore, a tube body with an opening on the peripheral surface was created, and an opening was formed at the rear end of the propulsion pipe being constructed so that the tube body with a lid detachably attached to the opening was placed at the branch portion of the pipe rod. The pipe body is constructed by connecting the pipe bodies. Next, it has been proposed to excavate a narrow range corresponding to the diameter of the opening of the tubular body having the opening, and to remove the lid in a state where the lid is exposed and to connect another pipe line to the opening portion ( For example, see Patent Document 2). That is, although excavation is necessary, it becomes possible to connect another pipe line directly to the pipe without going through the underground structure, and the construction period can be shortened and the cost can be reduced.

JP 2004-183289 A JP 2004-019435 A

  By the way, a large force is applied to the tubular body under construction because it is pressed forward from the rear side. However, when a large-diameter opening is provided in the tubular body, the strength of the tubular body may be insufficient. It is very difficult to apply the construction method disclosed in Patent Document 2 to the above-described large-diameter propulsion pipe instead of the small-diameter propulsion pipe.

Further, when a large-diameter pipe body is constructed from a plurality of concrete segments as described above, a PC steel material (PC tension material) is arranged and tightened along the circumferential direction inside the concrete segment connected in a tubular shape. It is known that concrete segments are firmly connected to each other. Further, the PC tendon is inserted into a tubular sheath previously arranged in the concrete segment along the circumferential direction. In addition, a plurality of sheaths and PC tendon members are arranged at intervals in the axial direction, but are arranged at relatively short intervals in order to improve strength.
If an opening is provided in such a tubular body, the sheath into which the PC tendon is inserted is exposed, and the opening cannot be formed, or bonding using the PC tendon is not possible. It becomes difficult.

  The present invention has been made in view of the above circumstances, and it is possible to use a concrete pipe body having an opening even in a large-diameter propulsion pipe, and further, a pair of halved concrete segments are joined. It is an object of the present invention to provide a concrete pipe body and a propulsion method that can form an opening in a concrete pipe body and facilitate connection of other pipe lines to the propulsion pipe.

The concrete pipe body according to claim 1 has a necessary length by repeatedly pushing the propelling pipe into the ground in the lateral direction, connecting the pipe body to the rear end of the pushed propelling pipe and pushing it in. It is used in the propulsion method for constructing pipe rods, and an opening that communicates the inside and outside to connect other pipes to the peripheral surface is formed, and the opening is made of steel that forms the periphery of the opening. A concrete pipe body in which a frame body is attached and a steel lid segment for closing the opening is detachably attached to the steel frame body, and a pair of halved concrete segments are combined in a tubular shape In this state, the pair of concrete segments are joined together by tightening with a plurality of PC tendons arranged in the circumferential direction along the circumferential direction and spaced apart in the axial direction. The PC tension member is formed, and the opening portion is formed in one concrete segment of the pair of concrete segments, and the PC tension member disposed at a position passing through the opening portion of the PC tension member is surrounded by the opening portion. A fixing unit that is disposed in a state that is spaced apart in a direction corresponding to the opening, and that fixes the opening side end portion of the PC tendon disposed at a position passing through the opening on the steel frame. Are provided at positions sandwiching the opening, and PC tension members arranged at positions passing through the opening are fixed to the steel frame at two fixing portions sandwiching the opening of the steel frame. A portion excluding the openings of the pair of concrete segments is arranged along the circumferential direction in a state in which the pair of concrete segments is fixed, and the pair of concrete segments is tightened .

In the first aspect of the present invention, even if the opening is provided in the concrete pipe body, by attaching a steel frame having sufficient strength to the opening, the concrete pipe body based on the formation of the opening is provided. The decrease in strength can be compensated. Accordingly, even in a large-diameter propulsion pipe, another pipe line can be directly connected to the pipe body using a pipe body in which an opening is formed in advance, so that the construction period can be shortened and the cost can be reduced.
Moreover, the lid that closes the opening is also made of a steel lid segment, so that it can be easily attached to and detached from the steel frame, and the strength in the opening can be secured.

In addition , even if the concrete pipe body is made by joining a pair of halved concrete segments with a PC tendon, an opening can be formed and sufficient strength based on the strength of the steel frame body. The concrete segments can be joined together.
That is, in the PC tendon arranged at a position passing through the opening, the opening is made by cutting the opening at the position of the opening and fixing the opening side end to the fixing portion of the steel frame. Even if there is no PC tendon, the two concrete segments will be fastened to the PC tendon via the steel frame, so long as the steel frame has sufficient strength. The concrete segments can be joined to each other with sufficient strength, and the PC tendon and its sheath are not arranged in the opening.

In the propulsion method according to claim 2 , the propulsion pipe is pushed into the ground in the lateral direction, and the operation of connecting the pipe body to the rear end of the pushed propulsion pipe and pushing it in is repeated. upon building a, the tube body other conduit of said tube member is connected, the opening that communicates the inside and outside in order to connect the other pipe is formed on a peripheral surface, the opening A concrete pipe body in which a steel frame body forming a peripheral edge portion of the opening portion is attached, and a steel lid segment for closing the opening portion is detachably attached to the steel frame body, After the construction of the pipe rod, in the concrete pipe body having the opening, the steel lid segment is removed and the other pipe line is connected , and the pipe body includes a pair of halved concrete. Concrete pipe with segments joined in a tubular shape The pair of halved concrete segments are fitted in a tubular shape, and tightened with a plurality of PC tendons arranged in a line along the circumferential direction and spaced apart in the axial direction inside the pair of concrete segments. Thus, when a concrete pipe is formed by joining a pair of the concrete segments to one of the concrete segments constituting at least one of the concrete pipes, The opening provided with the steel frame is formed, and the PC tendon disposed at a position passing through the opening of the PC tendon is an interval corresponding to the opening in the circumferential direction at the opening. Two pieces arranged so as to sandwich the opening part of the PC tension material arranged at a position passing through the opening part. Fixing the PC tendon placed at a position passing through the opening to the steel frame by fixing the opening side end at two locations across the opening of the steel frame. In this state, a portion excluding the openings of the pair of concrete segments is arranged along the circumferential direction, and the concrete segments are tightened .

  In the third aspect of the invention, similarly to the first aspect of the invention, even in a large-diameter propulsion pipe, another pipe line can be directly connected to the pipe body using a pipe body in which an opening is formed in advance. Thus, the construction period can be shortened and the cost can be reduced.

In addition, as in the first aspect of the present invention, even if the concrete pipe is formed by joining a pair of halved concrete segments with a PC tendon, an opening can be formed, and steel can be formed. The concrete segments can be joined with sufficient strength based on the strength of the frame body.

  According to the concrete pipe body and the propulsion method of the present invention, it is possible to easily connect another pipe line directly to a pipe constructed by a large-diameter propulsion pipe.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
First, the concrete pipe body used for the propulsion method according to the embodiment of the present invention will be described.
The concrete pipe body for propulsion pipe (hereinafter also simply referred to as “pipe body”) 10 is formed by joining a pair of half-shaped concrete segments 12 and 13 and is used in the propulsion method. The method is the same as that of a tubular body integrally formed of concrete. That is, the pipe body (propulsion pipe) 10 is lifted by a crane, carried into the bottom of a vertical shaft erected in the ground, and then successively added to the rear end of the propulsion pipe pushed laterally. Then, the rear end of the joined pipe body 10 is further pushed by a jack or the like to push in the propulsion pipe, and this is sequentially extended to construct a pipe rod.

  In addition, in the tubular body 10 described in this example, an opening 1 is formed on the peripheral surface thereof so as to penetrate inside and outside in order to connect another pipe line to the constructed pipe rod. A tube body having the same structure as the tube body 10 is used except that the opening portion 1 and the structure related to the opening portion 1 are not provided. When the tube rod is constructed as described above, other tubes are used. A tube body 10 having an opening 1 is used only at a portion where a path is connected. In addition, the structure relevant to the opening part 1 which concerns on this invention shall be mentioned later, and demonstrates the structure similar to the normal pipe body of the pipe body 10 previously.

  The tube body 10 is provided with a collar (steel strip) 14 surrounding the end portion at the rear end side (the side pushed by the jack or the like, the left side in FIG. 2) protruding from the concrete main body 10a by a predetermined length. It has been. On the other hand, on the tip side (the side added to the propulsion pipe, the right side in FIG. 1), a small diameter portion 16 having an outer diameter smaller than the other is formed by a length substantially the same as the protruding length of the collar 14. When the pipe body 10 is added to the rear end of the propulsion pipe, the small-diameter portion 16 of the front pipe body 10 and the collar 14 of the rear pipe body 10 are fitted together, and a filler (grouting material or the like) is inserted between the gaps therebetween. ).

The pair of halved concrete segments 12 and 13 are provided with a structure for joining and configuring the tubular body 10 as described below.
As shown in FIGS. 1 and 4, the concrete segments 12 and 13 are each formed with a sheath 22 with an annular hole 20 that extends in the circumferential direction and opens to the circumferential end faces (joining surfaces 18 and 18). Thereby, when a pair of concrete segments 12 and 13 are joined, the corresponding annular holes 20 communicate with each other, and in this example, the circumferential holes 24 inserted through the pipe body 10 are arranged at intervals in the axial direction. Five are formed in the state. A part of the circulation hole 24 opens into a recess 26 on the inner peripheral surface of the concrete segment 13, and an anchor 28 is provided in the recess 26.

  The recesses 26 and the anchors 28 are all provided in the concrete segment 13 where the opening 1 is not provided, and the positions of the recesses 26 and the anchors 28 are in the left and right central portions along the circumferential direction of the concrete segment 13. Are arranged at positions slightly shifted from the left to the right and left, and the adjacent holes 24 are arranged differently from the left and right central portions to the right or left.

After joining the joint surfaces 18 and 18 of the concrete segments 12 and 13, a PC tension member 30 such as a PC steel material is inserted from the recess 26 into the circulation hole 24 (annular hole 20) and tightened with a jack or the like, By fixing to 28, the tension | tensile_strength between the joint surfaces 18 and 18 of the two concrete segments 12 and 13 and the circumferential direction is given.
Therefore, the PC tendons 30 are arranged side by side in the axial direction based on the arrangement of the circulation holes 24 formed by the sheath 22.
Further, after the PC tendon 30 is inserted and tightened, the sheath 22 into which the PC tendon 30 is inserted is filled with the filler.

  As will be described later, the sheath 22 that is disposed through the opening 1 of the concrete segment 12 is in a state where the sheath 22 is interrupted at the peripheral edge of the opening 1 and is configured by the sheath 22. The annular hole 20 (circular hole 24) is also cut off at the inner peripheral edge of the opening 1, and the opening 1 side end of the annular hole 20 is formed on the right and left inner peripheral surfaces of the opening 1 as will be described later. Is opened, and the end of the PC tendon inserted into the sheath 22 can be exposed from the inner peripheral surface of the opening 1.

Further, the PC tendon 30 is also interrupted at the inner peripheral edge of the opening 1, and the end of the PC tendon 30 on the left peripheral edge of the opening 1 and the PC on the right peripheral edge of the opening 1. The ends of the tendon are connected to a steel frame 40 to be described later, and the concrete segments 12 and 13 can be tightened between the PC tendons in a state of being interrupted at the opening 1 via the steel frame 40. ing.
That is, the PC tendon 30 arranged at a position passing through the opening 1 is fixed at two locations sandwiching the opening 1 of the steel frame 40 and the openings 1 of the pair of concrete segments 12 and 13. A portion excluding the portion is arranged along the circumferential direction so as to fasten the pair of concrete segments 12 and 13.

  The collar 14 is fixed so as to cover the half circumferences of the concrete segments 12 and 13 by embedding reinforcing bars welded to the collar 14 in the concrete. Concave portions are provided in the circumferential end portions of the concrete segments 12 and 13, and a backing material is disposed in the concave portions, and the end portions of the collar 14 are welded to connect the collars 14 to each other.

  As shown in FIG. 2, each of the facing joint surfaces 18 of the concrete segments 12 and 13 is provided with a recess 34 for receiving a shear key 32, and a common shear key 32, an adhesive, and the like are provided in these recesses 34. Is installed. The main purpose of these shear keys 32 is to apply a shear force acting between the joint surfaces 18 of the concrete segments 12 and 13 when propelling the pipe body 10 into the ground. Both ends are formed into a truncated cone-shaped pin shape made of a high-strength material, for example, a metal such as steel, a resin, or ceramics. Since the shear key 32 is also used for positioning when the concrete segments 12 and 13 are joined at the same time, the shear key 32 can easily enter the recess 34 by having a tapered truncated cone shape.

  In addition, each concrete segment 12, 13 is provided with injection holes penetrating inward and outward at positions 45 degrees from the left and right joint surfaces 18, 18, and the press-fitting of the propulsion pipe is completed. Thus, an injection hole for injecting a filler (backfill material) is formed between the propulsion tube and the ground from inside the propulsion tube (tubular body 10).

And the concrete segment 13 in which the opening part 1 which becomes the lower side in FIG. 1 is not formed is basically connected to other pipes except that the anchors 28 of all the PC tendons 30 are formed. It has the same configuration as a normal tubular concrete segment.
On the other hand, in the concrete segment 12 in which the upper opening 1 in FIG. 1 is formed, the anchor 28 of the PC tendon 30 is not formed, and the opening 1 and the members related to the opening 1 described below are Except for being provided, it has the same configuration as a concrete segment of a normal tubular body.

Below, the member related to the opening part 1 formed in the concrete segment 12 and the opening part 1 is demonstrated.
In order to connect other pipe lines to the concrete segment 12 at the left and right central portions along the circumferential direction of the concrete segment 12 (tube body 10) at the time of molding and to the front and rear central portions that warp in the axial direction. A rectangular opening 1 that communicates the inside and the outside is formed. Moreover, the opening part 1 is comprised from two sides along the axial direction of the concrete segment 12, and two sides along the circumferential direction. The length (curved length) along the circumferential direction of the opening 1 is, for example, about 1/3 of the length along the circumferential direction of the concrete segment 12 or slightly shorter than that. The length along the axial direction of the portion 1 is, for example, ½ of the length along the axial direction of the concrete segment 12 or slightly longer than that.

A steel frame 40 constituting the opening 1 is attached to the periphery of the opening 1 when the concrete segment 12 is molded. In addition, illustration of the steel frame 40 is abbreviate | omitted in FIG.
The steel frame body 40 has left and right side walls 41, 41 constituting two sides along the above-described axial direction of the opening 1, and front and rear side walls 42, 42 constituting two sides along the circumferential direction. The left and right side walls 41 and 41 and the front and rear side walls 42 and 42 are assembled in a rectangular frame shape to constitute the inner peripheral surface of the opening 1. The left and right side walls 41, 41 are along the radial direction of the tubular body 10, and are not parallel to each other, whereas the front and rear side walls 42, 42 are perpendicular to the axial direction. Are arranged parallel to each other.

  Further, the steel frame body 40 includes an outer peripheral surface of the concrete segment 12 and an outer peripheral surface of the concrete segment 12 so as to extend outward from the upper end and lower end of the left and right side walls 41, 41 and the front and rear side walls 42, 42, respectively. An upper frame plate portion 43 and a lower frame plate portion 44 extending along the inner peripheral surface are provided. The upper frame plate portion 43 (lower frame plate portion 44) has a rectangular opening whose inner peripheral side forms the upper end inner periphery (lower end inner periphery) of the opening 1, and surrounds the periphery of the opening. The frame is formed along the outer peripheral surface (inner peripheral surface) of the cylinder. The four corners of the upper frame plate portion 43 and the lower frame plate portion 44 are chamfered.

In addition, the upper frame plate portion 43 and the lower frame plate portion 44 are basically embedded in the concrete segment 12 by the thickness thereof, and the concrete exposed on the surface of the concrete segment 12 as with the collar 14. There is almost no step between the surface.
Moreover, the cross section of the part which comprises each piece of the steel frame 40 is U-shaped (channel shape) from the side wall 41, 41 or the side walls 42, 42, and the upper frame plate portion 43 and the lower frame plate portion 44. It has become. Further, the upper side is joined to the upper frame plate part 43 and the lower side is the lower side in the portion surrounded by the U shape from the side walls 41, 41 or the side walls 42, 42 and the upper frame plate part 43 and the lower frame plate part 44. The side of the opening 1 side is joined to the frame plate portion 44 and connected to the side walls 41, 41 or the side walls 42, 42, and a plurality of reinforcing ribs 45 along the radial direction of the concrete segment 12 (tube body 10) are side walls. 41 and 41 or the side walls 42 and 42 are arranged side by side along the length direction.

  Further, the reinforcing rib 45 has a 1/4 circular cutout at the corner where the side walls 41, 41 or the side walls 42, 42 and the upper frame plate 43 or the lower frame plate 44 are joined. In the molding of the concrete segment 12, the concrete sufficiently wraps around the corner.

  Moreover, the opening part 1 side edge part of the PC tendon material 30 arrange | positioned in the position which passes along the opening part 1 of the said PC tendon material 30 to the side walls 41 and 41 along an axial direction, respectively is a fixing tool (not shown). A plurality of fixing portions 47 to be fixed by the above are disposed. In this example, the PC tendons 30 are arranged side by side in the direction of five axes, and the PC tendons 30 arranged at the front and the back of the PC tendons 30 pass through the front and the back of the opening 1. The three PC tension members 30 inside the remaining front and rear PC tension members 30 are arranged so as to pass through the opening 1.

  In addition, since the PC tendon 30 is disposed in a state where it is interrupted at the opening 1, it does not actually pass through the opening 1. Further, the fixing portions 47 and 47 are provided on the left and right side walls 41 and 41, respectively, so that the fixing portions 47 and 47 are disposed at positions where the opening 1 is sandwiched therebetween. Further, the two end portions of the PC tension member 30 in the state of being interrupted at the opening portion 1 on the opening portion 1 side are respectively fixed to two fixing portions 47 and 47 arranged at positions sandwiching the opening portion 1.

  And the sheath 22 which forms the annular hole 20 (circular hole 24) will be arrange | positioned corresponding to arrangement | positioning of the above-mentioned PC tendon material 30. FIG. And as shown in FIG. 4 which is sectional drawing along the axial direction of the part of the opening part 1 of the concrete segment 12, it corresponds to arrangement | positioning of the sheath 22 in the side walls 41 and 41 along the left-right axial direction. The three fixing portions 47 are arranged at intervals in the axial direction. The fixing portion 47 is formed as a concave portion having a truncated pyramid shape that opens on a side surface of the side walls 41 and 41 on the opening portion 1 side, has a substantially square cross section, and has a wide opening side. The fixing unit 47 is disposed so as to spread from the respective sides of the square-shaped bottom plate 47a and the bottom plate 47a toward the opening side. It is formed in a square cup shape from four trapezoidal side plates 47b.

The bottom plate 47a is connected to the sheath 22 by welding or the like and has a hole communicating with the annular hole 20 in the sheath 22. The annular hole 20 is formed by the fixing portions 47 of the side walls 41 and 41 of the steel frame body 40. Is open. By exposing the end of the PC tension member inserted into the sheath 22 as described above from the opening of the bottom plate 47a of the fixing unit 47, the PC tension member is fixed to the steel frame 40 with a fixing tool (not shown). be able to.
Further, the side walls 41 and 41 and the side walls 42 and 42 of the steel frame body 40 have a plurality of screw holes (not shown) for fixing the steel lid segments 50 shown in FIG. Is provided.

The above-mentioned members constituting the steel frame body 40 are joined by welding, for example, and the steel frame body 40 thus made of steel is welded to the reinforcing bars arranged in the concrete segment 12. It is joined.
Such a steel frame 40 can sufficiently cope with a compressive force for press-fitting the propelling pipe and a pulling force when fastening the PC tendon 30 fixed to the steel frame 40 as described later. It is designed to have strength, and the concrete segment 12 (pipe 10) whose strength has been reduced by having the opening 1 can be sufficiently reinforced.

The steel lid segment 50 is for closing the opening 1 provided in the concrete segment 12, and has a circular arc plate shape as a shape corresponding to the opening 1.
The steel lid segment 50 is rectangular and curved in an arc shape, and when the opening 1 is closed, the steel cover segment 50 is in a state along the outer peripheral surface of the concrete segment 12, and the axial direction of the front plate 51 The side plates 52, 52 extending from the left and right side edges along the radial direction of the arc (concrete segment 12) to the back side, respectively, and the front and rear side edges along the circumferential direction of the front plate 51, respectively, in the axial direction Front and rear side plates 53, 53 extending in a direction orthogonal to the surface, a plurality of reinforcing ribs 54 arranged along the axial direction on the back surface of the front plate 51 and along the radial direction, and a circumferential direction on the back surface of the front plate 51 And a plurality of reinforcing ribs 55 arranged along a direction orthogonal to the axial direction.

And when the steel lid segment 50 is installed in the opening 1, the left and right side walls 41, 41 along the axial direction of the steel frame body 40, and the left and right side plates 52 along the axial direction of the steel lid segment 50, 52 is substantially in contact with the left and right sides, and the front and rear side walls 42 and 42 along the circumferential direction of the steel frame 40 and the front and rear side plates 53 and 53 along the circumferential direction of the steel lid segment 50 are formed. It will be in the state which contact | abutted overlapping substantially back and front.
In the opening 1, the distance between the left and right side walls 41, 41 along the radial direction along the axial direction is made of steel that becomes narrower toward the inner side (center side along the radial direction) of the concrete segment 12. In addition, the distance between the left and right side walls 42 of the steel lid segment 50 is also narrowed toward the inside. Therefore, when the steel lid segment 50 is installed in the opening 1 of the concrete segment 12 (tube body 10) from the outside of the pipe body 10, the steel lid segment 50 is placed on the left and right side walls 41, 41 of the steel frame body 40. When the left and right side walls 42, 42 come into contact with each other, the steel lid segment 50 cannot move further inward, and the steel lid segment 50 is set in the opening 1 of the tubular body 10.

  The left and right side plates 52, 52 and the front and rear side plates 53, 53 of the steel lid segment 50 are made of steel with the steel lid segment 50 set in the opening 1 of the tubular body 10 as described above. Bolt holes 56 are respectively formed at positions overlapping the plurality of screw holes formed in the left and right side walls 41 and 41 and the front and rear side walls 42 and 42 of the frame body 40, and the left and right side plates of the steel lid segment 50. 52, 52 and the front and rear side plates 53, 53 can be fastened, and the left and right side walls 41, 41 of the steel frame body 40 and the front and rear side walls 42, 42 can be fastened.

Further, the steel lid segment 50 is in a state in which the bolt holes 56 formed in the left and right side plates 52 and 52 and the front and rear side plates 53 and 53 are exposed to the inside based on the above-described configuration. Can be performed from the inside of the tube body 10.
When the steel lid segment 50 is installed in the opening 1 of the tubular body 10, the outer peripheral surface of the tubular body 10 and the outer peripheral surface of the front plate 51 of the steel lid segment 50 are substantially continuous arc surfaces.
Further, since the steel lid segment 50 has a structure having sufficient strength by the above-described reinforcing ribs 54, 55, etc., the steel lid segment 50 is disposed on the inner peripheral side of the steel frame body 40 and opened. By closing the portion 1, in addition to the reinforcement by the steel frame body 40 described above, the strength of the tube body 10 can be further reinforced.

Next, a propulsion method using the concrete pipe body 10 will be described.
First, the halved concrete segments 12 and 13 constituting the tubular body 10 are manufactured in a factory and transported to the site by a trailer or the like.
Next, a pedestal is installed near the vertical shaft into which the tubular body 10 is carried, and one concrete segment 13 in which the opening 1 is not formed among the halved concrete segments 12 and 13 on the pedestal, Place with the concave side facing up.

Next, the concrete segment 12 having the other opening 1 constituting the tubular body 10 is lifted with the concave side facing downward, and placed on one concrete segment 12 previously placed, from above, The joint surfaces 18 and 18 of both concrete segments 12 and 13 are matched.
Next, a PC tension member 30 such as a PC steel material is inserted in the circumferential direction of the concrete segments 12 and 13.
At this time, the PC tendon 30 arranged on the end side from the front and rear openings 1 as described above is installed so as to go around the tubular body 10 composed of the concrete segments 12 and 13, and from the periphery of the opening 1. The PC tension members 30 arranged on the inner side are divided into left and right two pieces, and the left and right PC tension members 30 are respectively described above from the openings of the left and right circumferential holes 24 of the recess 26 in which the anchors 28 are provided. The steel frame body 40 is inserted through the openings of the right and left fixing portions 47 across the opening 1.

Then, the opening 1 side end portion of the PC tension member 30 exposed from the opening of the fixing portion 47 of the steel frame body 40 is disposed in the fixing portion 47 of the steel frame body 40. That is, the PC tendon 30 arranged so as to go around the tubular body 10 through the opening 1 becomes two pieces due to the configuration in which the opening 1 is interrupted. The steel frame body 40 is fixed at a position sandwiching the opening 1 therebetween.
Then, the fixing tool for fixing the end portion of the PC tension member 30 to the fixing portion 47 and the PC tension member 30 are housed in the fixing portion 47 which is a concave portion, and on the inner peripheral surface side of the steel frame body 40. It does not protrude.

Next, after tightening the PC tendon 30 with a jack or the like, the two concrete segments 12 and 13 are firmly integrated by fixing to the anchor 28. Next, the filler 22 is filled into the sheath 22 through which the PC tendon 30 is inserted, and the filler is also filled into the fixing portion 47 that is a recess, and the fixing tool in the fixing portion 47 and the end of the PC tendon 30 are filled. The portion is buried in the fixing unit 47.
Next, the steel lid segment 50 is lifted with the concave side down, and in the opening 1 facing the upper side of the tubular body 10 formed by joining the concrete segments 12 and 13 as described above. Install. In this case, the steel lid segment 50 does not fall into the tube body 10 from the opening 1 due to the above-described configuration, and is in a state of being installed in the opening 1.

Next, the steel lid segment 50 and the steel frame body 40 are fastened from the inside of the tube body 10 with bolts.
Thereby, the tubular body 10 having the opening 1 and having the opening 1 closed by the steel lid segment 50 is assembled. In addition, when the concrete segments 12 and 13 are joined, a shear key is attached and the collar 14 is connected.

Next, this tubular body 10 is lifted by a crane and is carried into the bottom of a shaft erected in the ground.
Next, the tube body (propulsion tube) 10 is pushed into the ground while being connected to the rear end of the tube body 10 pushed in first. At this time, an ordinary tube body in which the opening 1 is not formed before and after the tube body 10 is disposed so that the tube body 10 is disposed at a position to which the other pipe line is connected. become.
The tube 10 is pushed into the ground by a jack provided between the bearing wall (reaction wall) of the shaft and the tube 10 that has been carried in, but the force acting on the tube 10 at this time On the other hand, even if the opening 1 is formed in the tube body 10, it can be sufficiently handled by being reinforced by the steel frame body 40.

Further, even if the two concrete segments 12 and 13 are fastened and joined with a plurality of PC tendons, the sheath 22 and the PC tendons are not exposed from the opening 1, and the two concretes have sufficient strength. The segments 12 and 13 can be joined together.
Then, after constructing a pipe rod by a propulsion pipe including the tubular body 10 having the opening 1, a portion of the tubular body 10 having the opening 1 is excavated from the ground or another underground structure, and the opening 1 The part is exposed, and the fastening of the bolt of the steel lid segment 50 is released from the inside of the pipe cage including the pipe body 10. Then, after removing the steel lid segment 50, another pipe line is directly connected to the opening 1 portion of the pipe rod.

As a result, an underground structure for connecting a pipe rod such as a human hole and another pipe line is provided at a connection portion of another pipe line, and the pipe rod and the other pipe line are connected via the underground structure. Therefore, it is possible to connect another pipe line directly to the pipe rod, and when connecting another pipe line to the pipe rod, the construction period can be shortened and the cost can be reduced.
In addition, this embodiment is an example and the magnitude | size etc. of the opening part 1 with respect to the tubular body 10 can be changed without the range permitted in intensity | strength.

It is sectional drawing orthogonal to the axial direction of the concrete pipe body used for the propulsion method concerning embodiment of this invention. It is a side view of the concrete pipe body. It is a top view of the concrete pipe body. It is sectional drawing along the axial direction of the concrete segment provided with the opening part which comprises the said concrete pipe body. A steel lid segment that closes the opening.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Opening part 10 Concrete pipe body 12 Half split concrete segment 13 Half split concrete segment 30 PC tension material 40 Steel frame 47 Fixing part 50 Steel lid segment

Claims (2)

The propulsion pipe is pushed into the ground in the horizontal direction, connected to the rear end of the pushed propulsion pipe, and the operation of pushing in is repeated, and is used in the propulsion method of constructing a pipe rod of the required length ,
In order to connect other pipe lines to the peripheral surface, an opening that communicates inside and outside is formed,
A steel frame that forms the peripheral edge of the opening is attached to the opening,
A concrete tube body in which a steel lid segment for closing the opening is detachably attached to the steel frame body ,
In a state where the pair of halved concrete segments are combined into a tubular shape, the inside of the pair of concrete segments is along the circumferential direction, and tightened with a plurality of PC tension members arranged side by side in the axial direction. Formed by joining a pair of concrete segments,
The opening is formed in one concrete segment of the pair of concrete segments,
The PC tendon disposed at a position passing through the opening of the PC tendon is disposed in a state of being spaced apart from the opening by a distance corresponding to the opening in the circumferential direction.
The steel frame body is provided with a fixing portion for fixing the opening side end portion of the PC tendon disposed at a position passing through the opening portion at a position sandwiching the opening portion, respectively.
The PC tendon disposed at a position passing through the opening is a pair of the concrete in a state where the PC tension member is fixed to the fixing portion of the steel frame at two fixing portions sandwiching the opening of the steel frame. A concrete tubular body characterized in that a portion excluding an opening of a segment is arranged along a circumferential direction to clamp a pair of the concrete segments . Upon the propelling tube laterally pushed into the ground, by repeating the operation of pushing by connecting the tube to the rear end of the propulsion tube is pushed, to build Kanmizo required length,
An opening communicating with the inside and outside of the tubular body to which the other conduit is connected is formed on the peripheral surface to connect the other conduit to the peripheral surface, and the opening includes the opening of the opening. Using a concrete pipe body to which a steel frame body that forms a peripheral portion is attached, and a steel lid segment that closes the opening is detachably attached to the steel frame body,
After constructing the pipe rod, in the concrete pipe body having the opening, in the propulsion method of removing the steel lid segment and connecting another pipe line ,
As the tubular body, a concrete tubular body in which a pair of halved concrete segments are joined in a tubular shape,
In a state where the pair of halved concrete segments are combined into a tubular shape, the inside of the pair of concrete segments is along the circumferential direction, and tightened with a plurality of PC tension members arranged side by side in the axial direction. When forming a concrete pipe by joining a pair of the concrete segments,
One of the concrete segments constituting at least one of the concrete pipes is formed with the opening having the steel frame,
The PC tendon arranged at a position passing through the opening of the PC tendon is arranged in a state of being spaced apart from the opening in the circumferential direction with an interval corresponding to the opening.
Fix the two opening side end portions arranged so as to sandwich the opening portion of the PC tendon disposed at a position passing through the opening portion at two positions sandwiching the opening portion of the steel frame body, respectively. By doing
PC tension members arranged at positions passing through the openings are arranged along the circumferential direction except for the openings of the pair of concrete segments in a state of being fixed to the steel frame, and the concrete segments are A propulsion method characterized by tightening .

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