JP3081805B2 - Concrete pipe joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for joining concrete pipes to each other.

[0002]

2. Description of the Related Art As one type of septic tank, as shown in FIG. 1, a diameter of 900 to 6,000 mm and a height of 1,000 mm.
There is a septic tank 10 in which a plurality of concrete pipes 11 are superposed and joined together. In the septic tank 10, the respective overlapping surfaces 11a and 11b of the concrete pipes 11 are formed in steps, and these steps are fitted to each other and polymerized.
The concrete pipes 11 are joined to each other by fixing the overlapped surface by an appropriate means. The septic tank 1
0 is buried in the soil in an upright state.

In FIG. 1, reference numeral 12 denotes a pipe for a submerged pipe method (discharge pipe), and a disc-shaped concrete base 13 is attached to the lowermost concrete pipe 11 joined to the discharge pipe 12. It is fixed. Also, in FIG.
Reference numeral 14 denotes a reinforced concrete slab that covers the upper end of the uppermost concrete pipe 11.

[0004]

Incidentally, since the recent Great Hanshin Earthquake, in the septic tank of this type, a high joint strength is required at the joint between the concrete pipes 11. In order to cope with this, a method of firmly joining the concrete pipes 11 to each other with a connection fitting such as a bolt 21 is considered. However, the concrete pipes are firmly fastened and fixed via the bolts 21 at their overlapping portions. A joining means and a joining structure that facilitate joining work such as hole alignment for inserting a bolt for joining into the engaging hole have not been proposed.

Accordingly, it is an object of the present invention to provide a joint structure capable of firmly joining concrete pipes constituting a superposed pipe structure such as a septic tank by an easy joining operation.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a concrete pipe joint structure in which a plurality of concrete pipes are overlapped in the axial direction. A work recess opening in the side peripheral surface at a position separated by a predetermined amount in the longitudinal direction from the overlapping surface, and a guide that gradually expands from the recess to the overlapping surface and opens to the overlapping surface side. A hole, and a bolt buried at the base end side of the other concrete pipe at the base end side, protruding in the axial direction from the overlapped surface, facing the guide hole, and passing the bolt through the guide hole. And the concrete pipes are joined at the overlapping portion by a fastening force of a nut screwed to a tip of the bolt and the bolt.

In the joint structure, the guide hole of the one concrete pipe may be formed by a synthetic resin guide member embedded in the overlapping portion of the concrete pipe. The member has a conical cylindrical shape that gradually opens toward an overlapping surface side opening, one end of which is open to the recess of the one concrete pipe and the other end has an opening that opens to the overlapping surface of the concrete pipe. Can be employed.

In the joining structure, a guide member having an outward flange portion at a position away from the front end of the one end opening by a predetermined distance is employed as the guide member. The surface is exposed to the concave portion of the one concrete pipe, and the distal end of the guide member is projected into the concave portion, and the metal guide plate is fitted to the distal end portion of the guide member. A nut may be fastened to a tip portion of a bolt penetrating the member, and the overlapping portion of the two concrete pipes may be joined while the plate is sandwiched between the outward flange portion of the guide member and the nut.

In the joint structure, an anchor member having a reinforcing bar embedded in the one concrete pipe may be used as the plate. In addition,
The guide member is a thermoplastic resin such as polyethylene and polyvinyl chloride resin, a thermosetting resin such as polyester, a fiber-reinforced synthetic resin in which reinforcing fibers such as glass fibers are blended with these,
Metals such as aluminum and steel, and structural materials such as ceramics can be used.

[0010]

According to the joint structure of the present invention, when each concrete pipe is superimposed, a bolt embedded in the other concrete pipe is inserted into a guide hole provided in one concrete pipe. Can be polymerized. In this case, the guide hole has a large diameter on the side where the bolt is inserted and a small diameter on the protruding side, so that it is easy to insert the bolt into the guide hole, and each concrete pipe is accurately positioned by the action of the guide hole and the bolt. Polymerized.

[0011] As a result of this superimposition operation, the tip of the bolt embedded in the other concrete pipe penetrates through the guide hole and projects into the recess provided in the one concrete pipe, and a nut is easily screwed into the tip of the protruding bolt. By screwing the nut, the overlapping portions of both concrete pipes are tightened and joined firmly. As described above, by employing the joining structure, a large structure in which a plurality of concrete pipes such as a septic tank of this type are superimposed can be firmly joined by an easy joining operation.

In the joint structure according to the present invention, if the guide hole of one concrete pipe is formed by a guide member made of synthetic resin, the tip of the bolt is inserted into the guide hole when the bolt embedded in the other is inserted into the guide hole. There is no damage to the bolts even if they contact or slide against the inner peripheral wall of the concrete pipe, and the damage to the bolts does not affect the joining work between the concrete pipes.

Further, in the joining structure, a guide member having an outward flange portion at a position away from the front end of the one end side opening by a predetermined amount is adopted as the guide member, and the surface of the outward flange portion of the guide member is provided. While exposing to the recess of one concrete pipe, the tip of the guide member is projected into the recess, and the guide member is penetrated in a state where a metal plate is fitted to the tip of the guide member. If the nut is screwed onto the tip of the bolt to be clamped, and the plate is sandwiched between the outward flange portion of the guide member and the nut, the overlapping portions of the two concrete pipes are tightened and joined together. Is applied to the overlapping portion of the two concrete pipes via the metal plate, so that a stronger connection can be achieved.

In this case, if an anchor member having a reinforcing bar buried in one of the concrete pipes is adopted as the metal plate, the connection between the two concrete pipes is further strengthened.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 schematically shows a septic tank 10 in which concrete pipes are joined to each other by employing a joining structure according to the present invention. Have been. The septic tank 10 is formed by stacking a plurality of cylindrical concrete pipes 11 having a predetermined diameter and a predetermined length in a plurality of stages, and via mounting bolts 21 at a plurality of locations in the circumferential direction of the overlapping portion of each concrete pipe 11. Are joined to each other.

In the overlapping portion of each concrete pipe 11, as shown in FIG. 3, the lower end overlapping surface 11a is formed as a step portion whose outer peripheral side protrudes downward, and the upper end overlapping surface 11b is formed on the inner peripheral portion. The side is formed as a step projecting upward, and these steps are fitted together and overlapped. FIGS. 2 and 3 are enlarged views of a portion indicated by an arrow A in FIG. 1, and a recess opening to the inner peripheral side at a position higher by a predetermined amount from the lower end side overlapping surface 11 a in the overlapping portion of each concrete pipe 11. 11c is formed, and a plurality of guide members 22 are buried at predetermined positions in the circumferential direction at a portion between the lower end side overlapping surface 11a and the recess 11c in the overlapping portion.

The guide member 22 is made of a synthetic resin such as polyvinyl chloride or the like. As shown in FIGS. 2 to 5, the lower end side opening 22a is oblong and the upper end side opening 22b is circular. Shaped guide body 22c, an oval lower end side outward flange portion 22d provided at the lower end of the guide body 22c, and an oval upper end side outer flange portion provided at the upper end of the guide body 22c and having a smaller diameter than the lower end side outward flange portion 22d. Part 22e
And a cylindrical portion 22f protruding from the upper surface of the upper end side outward flange portion 22e by a predetermined length. The lower end side opening part 22a and the upper end side opening part 22b are located concentrically in the up-down direction.

The guide body 22c is not limited to a circular shape but may have another shape such as a polygon. Further, the guide member 22 is not limited to a synthetic resin, and may be made of a structural material such as a metal such as aluminum and steel, and a ceramic. Also,
The guide member may be integrally formed in the mold, may be a combination of components, or may be a plate member attached. Further, a coating may be applied to the surface of the guide member in order to impart corrosion resistance. In such a guide member 22, the lower end side outward flange portion 22d is connected to the guide body 22c.
Is formed slightly longer than a half circumference at the peripheral edge of the lower end side opening 22a, and an upward flange 22g protruding upward from the front edge is formed. An arcuate portion 22h extending downward is formed from a portion of the lower end side opening 22a of the guide body 22c where the lower end side outward flange portion 22d is not formed, and a lower end of the arcuate portion 22h is formed at a lower end of the arcuate portion 22h. An outward flange portion 22i is formed.

When the guide member 22 is buried in the overlapping portion of the concrete pipe 11, the lower end side outward flange portion 2 is provided.
The lower surface of 2d is exposed on the lower surface of lower end side overlapping surface 11a, the lower surface of lower end side outward flange portion 22i is also exposed on the lower surface of lower end side overlapping surface 11a, and the upper surface of upper end side outward flange portion 22e is recessed. It is exposed on the bottom surface of 11c, and the cylindrical portion 22f protrudes upward from the bottom surface of the recess 11c by a predetermined height. In this buried state, the inside of the guide main body 22c is a guide hole 22j, the guide hole 22j is opened to the lower end through the lower end opening 22a, and is inserted into the recess 11c through the upper end opening 22b and the cylindrical portion 22f. It is open.

In the concrete pipe 11, a metal anchor member 23 is buried in the overlapping portion of the concrete pipe 11 in a state of being fitted on the outer periphery of the cylindrical portion 22f of the guide member 22. The anchor member 23 includes a flat plate portion 23a, a pair of inclined portions 23b projecting outwardly and upward from both ends of the plate portion 23a, and a pair of inclined portions 23b.
b, and a reinforcing bar 23c that projects in the same inclined shape. The anchor member 23 is fitted to the outer periphery of the cylindrical portion 22f of the guide member 22 through a through hole 23d formed in the plate portion 23a.
3a is received by the outer flange portion 22e on the upper end side of the guide member 22 and is exposed to the concave portion 11c.
And a reinforcing bar 23c are embedded in the concrete pipe 11.

On the other hand, in the overlapping portion of the concrete pipe 11,
The base end of the mounting bolt 21 is buried. The plurality of mounting bolts 21 are buried at predetermined intervals in the circumferential direction, and penetrate upward through the upper overlapping surface 11b of the concrete pipe 11 and protrude by a predetermined length. Each mounting bolt 21
It faces the upper opening 22b of each guide member 22, and is located corresponding to each guide member 22.

When the concrete pipes 11 are joined to each other, the joint structure shown in FIGS. 2 and 3 is obtained.
The joint between the concrete pipes 11 is strong, and the joining operation is easily performed. In order to join the concrete pipes 11, the concrete pipes 11 are first superposed one after another. When the concrete pipes 11 are superposed, the guide body 2 of each guide member 22 embedded in one concrete pipe 11 is used.
Each bolt 21 embedded in the other concrete pipe 11 is inserted into 2c and polymerized. In this case, in the guide hole 22j of the guide member 22, the lower end side opening 22a, which is the insertion side of the bolt 21, has a large diameter, and the upper end side opening 22b, which is the protruding side, and the cylindrical portion 22f have a small diameter. Insertion of the bolt 21 into the guide member 22 is easy, and the concrete pipes 11 are accurately positioned and overlapped by the action of the guide member 22 and the mounting bolt 21.

As a result of this superimposition operation, the tip of the mounting bolt 21 embedded in the other concrete pipe 11 penetrates through the guide hole 22j of the guide member 22, and projects into the recess 11c provided in the one concrete pipe 11. The nut 24a can be easily screwed to the tip of the mounting bolt 21 thus formed. By screwing the nut 24a, the overlapping portion between the concrete pipes 11 is tightened as shown in FIGS. And is firmly joined. Note that reference numeral 24b in the figure denotes a washer.

As described above, if the joining structure is adopted,
Each concrete pipe 1 constituting a septic tank 10 of this type
1 can be firmly joined to each other by an easy joining operation, and a guide hole 22 of one concrete pipe 11 can be provided.
Since j is composed of the guide member 22 made of synthetic resin, the tip of the mounting bolt 21 abuts or slides on the inner peripheral wall of the guide hole 22j when the mounting bolt 21 embedded in the other side is inserted into the guide member 22. The mounting bolts 21 are not damaged even when they come into contact with each other, and the damage of the mounting bolts 21 does not affect the joining work between the concrete pipes 11.

In the joining structure, a guide member having an upper end side outward flange portion 22e in an upper end side opening portion 22b of the guide body 22c is adopted as the guide member 22, and the upper end side outward flange portion of the guide member 22 is adopted. The surface of 22e is exposed to the recess 11c of the one concrete pipe 11, and the cylindrical portion 22f on the distal end side of the guide member 22 is projected into the recess 11c, thereby forming the cylindrical portion 22f of the guide member 22.
With a metal anchor member 23 fitted in the nut, a nut 2 is attached to the tip of a mounting bolt 21 that penetrates the guide member 22.
4a, the anchor member 23 is sandwiched between the upper end side outward flange portion 22e of the guide member 22 and the nut 24a, and the overlapping portion between the concrete pipes 11 is tightened and joined. Is applied to the overlapping portion between the two concrete pipes 11 via the anchor member 23, so that a stronger connection can be achieved.

The anchor member 23 has a welded reinforcing bar 23c, and the reinforcing bar 23c is embedded in one of the concrete pipes 11, so that the connection between the two concrete pipes 11 is further strengthened.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a septic tank employing a joint structure according to the present invention.

FIG. 2 is an enlarged vertical sectional front view of a joint portion indicated by an arrow A in FIG. 1 in the same septic tank.

FIG. 3 is an enlarged longitudinal side view of the joint.

FIG. 4A is a longitudinal sectional front view of a guide member employed in the joint structure, and FIG. 4B is a bottom view of the guide member.

FIG. 5 is a longitudinal sectional side view (a) and a plan view (b) of the guide member.

[Explanation of symbols]

10 ... septic tank, 11 ... concrete pipe, 11a ... lower end side superposed surface, 11b ... upper end side superposed surface, 11c ... recess 11c,
12: Waste pipe, 13: Concrete base, 14: Concrete slab, 21: Mounting bolt, 22: Guide member, 22a: Lower opening, 22b: Upper opening, 2
2c: guide body, 22d: lower end side outward flange, 2
2e: upper end side outward flange portion, 22f: cylindrical portion, 22g ...
Upward flange portion, 22h: arc-shaped portion, 22i: lower end side outward flange portion, 22j: guide hole, 23: anchor member,
23a: plate portion, 23b: inclined portion, 23c: rebar,
23d: Through-hole.

Claims (6)

(57) [Claims] 1. A concrete pipe joining structure in which a plurality of concrete pipes are superposed in the axial direction, and a superposed portion of one of the concrete pipes superposed on each other is disposed at a position in a longitudinal direction from the superposed surface. A work recess that opens on the side peripheral surface at a fixed distance away portion, and a guide hole that gradually expands and extends from the recess to the overlap surface and opens to the overlap surface, and the other concrete The overlapping portion of the tube is provided with a bolt buried on the base end side and protruding the overlapping surface in the axial direction and facing the guide hole, and the bolt is made to pass through the guide hole and project into the recess, A joint structure between concrete pipes, wherein the two concrete pipes are joined at an overlapping portion by a tightening force of a nut screwed to a tip of the bolt and the bolt. 2. A concrete structure according to claim 1, wherein the guide hole of said one concrete pipe is formed by a guide member embedded in the overlapping portion of said concrete pipe. Joint structure. 3. A joint structure between concrete pipes according to claim 2, wherein said guide member is made of synthetic resin or metal. 4. The joint structure according to claim 2, wherein the guide member has one end opening at one end opening to the recess of the one concrete pipe, and the other end has an overlapping surface of the concrete pipe. A concrete tube joining structure, characterized in that the concrete pipes are formed in a conical cylindrical shape having an overlapping surface side opening that opens to the opening and gradually expanding toward the overlapping surface side opening. 5. The joining structure according to claim 4, wherein the guide member has an outward flange portion at a predetermined distance from the tip of the eye in the one end side opening, and the surface of the outward flange portion of the guide member has The guide member is exposed in the recess of the one concrete pipe, and the tip of the guide member protrudes into the recess, and a metal plate is fitted to the tip of the guide member. A nut is screwed to the tip of a bolt that penetrates the joint, and the overlapping portion of the concrete pipes is tightened and joined while the plate is sandwiched between the outward flange portion of the guide member and the nut. A joint structure between concrete pipes. 6. A joint structure between concrete pipes according to claim 5, wherein said plate is formed on an anchor member having a reinforcing bar embedded in said one concrete pipe. .