JP2895430B2 - Flexible precast concrete perforated pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible precast concrete perforated pipe for flexibly connecting precast concrete perforated pipes and following relative displacement between the connected precast concrete perforated pipes.

[0002]

2. Description of the Related Art In the case of using a precast concrete perforated pipe as a conduit material of a common groove of an electric wire, the connection is generally simply rigidly connected by male and female butt connection or bolt connection.

[0003]

The conventional simple butt connection has problems such as insufficient water stoppage and displacement of the connection portion, and the bolt connection is rigid connection, so each precast concrete porous tube due to uneven settlement of the ground. Cannot follow the relative displacement between them, and there is a high risk of damage due to uneven settlement of the ground, earthquakes, large impacts, etc.
There is a need for improvement.

[0004] The present invention has been made in response to this demand, and even when a large relative displacement occurs between each precast concrete porous tube, a flexible precast concrete porous tube capable of being displaced following the relative displacement. It provides a tube.

[0005]

According to the present invention, there are provided (A) a plurality of through holes for a cable having a guide pipe housing portion having a larger hole diameter than the main body portion at an end portion on a connection end side, and a nut having a large hole diameter at one end. A pair of precast concrete perforated pipes having through holes for movement control bolts forming mounting holes are used as a set of two pieces (B) Insertion of guide pipes spanning the guide pipe storage portions of both precast concrete perforated pipes and both An elastic packing material is attached between the connecting end faces of the precast concrete perforated pipe. (C) A movement control bolt is inserted between the nut mounting holes of both the precast concrete perforated pipes, and both ends of the precast concrete perforated pipe are attached to the nut mounting holes with nuts. It is a flexible precast concrete perforated tube.

A first point of the present invention is that the connection end side of the cable through-hole of the precast concrete perforated pipe has a large hole diameter and a guide pipe housing portion is formed. A guide pipe is inserted so as to straddle the pipe, and an elastic packing material is attached between the connection end faces of the two precast concrete perforated pipes using the guide pipe. The second point is that
By connecting the two precast concrete perforated pipes with the movement control bolt, the relative displacement between the two is constrained to be within a certain range, and within that range, the precast concrete perforated pipe can be relatively displaced. This is the point where the relative displacement was restrained so as not to occur. Since the upper limit of the relative displacement between the two precast concrete perforated pipes connected in this manner is restricted, there is no possibility that the connection portion will be detached or damaged.

The flexible precast concrete perforated pipe of the present invention is assembled in a factory as a set of two precast concrete perforated pipes constituting the perforated pipe, transported to the site, laid in the middle of the general precast concrete perforated pipe, and laid in the middle. The flexible connection part of the concrete perforated pipe is constituted. For this reason, as each precast concrete porous tube constituting the flexible precast concrete porous tube of the present invention, one having the same length as the general precast concrete porous tube may be used, but approximately half of the general precast concrete porous tube. The design of conduits and flexible precast concrete perforated pipes are to ensure that the length of flexible precast concrete perforated pipes assembled using the same length is approximately the same as that of general precast concrete perforated pipes. It is preferable from the viewpoint of transportation.

The connection between the flexible precast concrete perforated pipe of the present invention and a general precast concrete perforated pipe is rigidly connected by bolt connection or the like as usual.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a flexible precast concrete perforated pipe of the present invention. FIG. 1 (a) is a longitudinal sectional view along an axial direction including a general precast concrete perforated pipe.
(B) is a BB sectional view of (a), and (c) is a CC sectional view including the general precast concrete porous tube of (b).

FIG. 2 shows an example of an assembly of a guide pipe and an elastic packing material mounted on a connecting portion of a flexible precast concrete perforated pipe of the present invention, wherein (a) is a front view,
(B) is a side view, (c) is a CC sectional view of (a).

FIG. 3 shows another example of an assembly of a guide pipe and an elastic packing material attached to a connecting portion of a flexible precast concrete perforated pipe of the present invention, wherein (a) is a front view,
(B) is a side view, (c) is a CC sectional view of (a).

The flexible precast concrete perforated pipe 1 of the present invention comprises two short-length precast concrete perforated pipes 2a and 2b. Each of the short and long precast concrete perforated pipes 2a and 2b has four cable through holes 3, two movement control bolt through holes 4, two connection bolt insertion holes 5, and a connection corresponding to the connection bolt insertion hole 5. A work notch 6 is provided. Cable through hole 3
Has a larger diameter than the cable through hole 3 to form a guide pipe housing 3a. One end of the movement control bolt through hole 4 has a larger diameter than the movement control bolt through hole 4 and has a nut mounting hole 4a. Is formed.

In this example, there are four cable through holes 3 and two movement control bolt through holes 4 and two connection bolt insertion holes 5.
However, depending on the size of the precast concrete perforated pipe, the cable through-hole 3 is usually 2 to 9 articles,
The through hole 4 for the movement control bolt and the connecting bolt insertion hole 5 are provided in 1 to 4 sections. It is preferable to provide an even number of the through holes 4 for the movement control bolts or the connecting bolt insertion holes 5 at the symmetric positions, and if one is provided, it is provided at the center.

FIG. 2 shows an elastic packing material 7 used in the present invention.
And the guide pipe 8 are assembled. The elastic packing material 7 is a circular plate corresponding to the position, number, and cross-sectional area of the cable through-holes 3 in an elastic plate such as rubber or urethane resin. The cutout of the above is used. The elastic plate may be a single elastic plate or a laminate of several elastic plates. It is preferable to use a laminated elastic body plate whose core is a medium soft elastic body and both sides are hard elastic bodies. The elastic packing material 7 has a thickness of 1 to 10 cm.
A relatively thick one is used.

FIG. 3 shows another elastic packing material 7 used in the present invention in a form assembled with a guide pipe 8. The elastic packing material 7 is formed in a hollow elastic plate at the position of the through hole 3 for a cable. , The number and the cross-sectional area are used. In this case, an air circulation hole 8a is formed in the guide pipe 8 so that air can flow between the hollow portion 7a of the elastic packing material 7 and the cable through hole 3.

The guide pipe 8 is made of an iron plate, plastic, hard rubber, or the like according to the hole diameter and depth of the guide pipe storage section 3a, and one end of the guide pipe 8 is inserted into the guide pipe storage section 3a of one of the short and long precast concrete porous tubes 2a. It is used by inserting and inserting an elastic packing material 7 around the projecting guide pipe 8, and then inserting the projecting portion of the guide pipe 8 into the guide pipe storage portion 3a of the other short-length precast concrete porous tube 2b. However, as shown in FIGS. 2 and 3, the elastic packing material 7 and the guide pipe 8 are assembled in advance, and one end of the guide pipe 8 is inserted into the guide pipe storage portion 3a of one of the short and long precast concrete porous tubes 2a. It is better to attach the guide pipe 8 and the elastic packing material 7 at one time by assembling the flexible precast concrete porous tube 1. It is simple and easy.

Referring to FIG. 1, an example of a construction procedure for manufacturing a flexible precast concrete perforated pipe 1 of the present invention by connecting two short and long precast concrete perforated pipes 2a and 2b, and a manufactured flexible pipe. An example of a construction procedure for connecting the precast concrete perforated pipe 1 to the general precast concrete perforated pipe 9 will be described.

(1) The short and long precast concrete perforated pipes 2a and 2b are placed adjacently on a workbench. The guide pipe 8 is inserted into the guide pipe storage portion 3a of the cable through hole 3 of the short and long precast concrete porous tube 2a.
The elastic packing material 7 is fitted around the projecting guide pipes 8. At this time, if necessary, an adhesive is applied to both surfaces of the elastic packing material 7 so that the elastic packing material 7
Of the short-length precast concrete perforated tube 2
b. When the hollow elastic plate shown in FIG. 3 is used as the elastic packing material 7, the mounting operation by this bonding is indispensable.

(2) The short-length precast concrete perforated pipe 2b is moved, and the guide pipe 8 projecting from the end face of the short-length precast concrete perforated pipe 2a is inserted into the guide pipe storage portion 3 of the short-length precast concrete perforated pipe 2b. The short-length precast concrete porous tube 2b is inserted into the short-length precast concrete porous tube 2b.
Press against a side. Both are connected so that the elastic packing material 7 is sandwiched between both end surfaces.

(3) The length of the short and long precast concrete perforated pipes 2a + the length of the short and long precast concrete perforated pipes 2b + the elastic packing penetrating both the short and long precast concrete perforated pipes 2a and 2b and the elastic packing material 7. A movement control bolt 10 which is shorter in thickness than the material 7 is inserted between the nut mounting holes 4a, and both ends thereof are fixed to the nut mounting holes 4a by nuts. Thereby, the elastic packing material 7 is sandwiched between the connecting end faces in a slightly compressed state.

(4) The connected flexible precast concrete perforated tube 1 is compressed to a predetermined length, and the temporary fixed steel plate 11 is connected to both short and long sides in such a manner as to straddle the side surfaces of both short-length precast concrete perforated tubes 2a and 2b. The precast concrete perforated pipes 2a and 2b are bolted together to hold the flexible precast concrete perforated pipe 1 at a predetermined length. At this time,
The elastic packing material 7 is sandwiched between the connecting end faces in a state of being moderately compressed, and both ends of the movement control bolt 10 are not fixed to the nut mounting holes 4a but are stored with play in the nut mounting holes 4a. I have.

By the above operation, the flexible precast concrete porous tube 1 of the present invention is manufactured.

The connecting portion of the flexible precast concrete perforated pipe 1 can be deformed not only in the axial direction but also in the direction perpendicular thereto by the deformation of the thick elastic packing material 7 interposed therebetween. It can be deformed in various directions.

(5) The flexible precast concrete perforated pipe 1 is transported to the site and installed adjacent to the general precast concrete perforated pipe 9 to be connected. A connecting bolt 13 is inserted between the connecting work notch 6 of each of the short and long precast concrete perforated pipes 2a and 2b and the bolt fixing hole 12 of the connecting end face, and one end of the connecting bolt 13 is connected with a common nut. And the other end with a bolt 14
Fixed to. One end of the connection bolt 13 inserted into the general precast concrete perforated pipe 9 is screwed into the free end of the long nut 14 to connect the flexible precast concrete perforated pipe 1 and the general precast concrete perforated pipe 9 via the long nut 14. Link. Temporarily fixed steel plate 11 after connection work
Is removed from the flexible precast concrete porous tube 1.

For connecting the flexible precast concrete perforated pipe 1 and the general precast concrete perforated pipe 9, in addition to the above-described method, a coupler is used instead of the long nut 14, and the connection is fixed to each bolt fixing hole 12. A method of connecting the ends of the bolts 13 with a coupler, instead of providing the connection bolt insertion holes 5 and the connection work notches 6,
A normal connection method such as a method in which a buried nut is buried in the connection end face of the flexible precast concrete perforated pipe 1 and one end of a connection bolt 13 of the general precast concrete perforated pipe 9 is screwed and connected to the buried nut. Adopted.

(A) The above-mentioned (4) at the time of manufacturing the flexible precast concrete perforated pipe 1 is omitted, and the flexible precast concrete perforated pipe 1 which has not been compressed is carried to the site, and the flexible precast concrete perforated pipe is manufactured. In the state where 1 is compressed, general precast concrete perforated pipe 9
(B) When the flexible precast concrete perforated tube 1 is manufactured, the nuts at both ends of the movement control bolt 10 are strongly tightened by the operation (3) described above when the elastic packing material 7 is formed.
Is transported to the site, and after installation, the nuts at both ends of the movement control bolt 10 are loosened to allow free play at both ends of the movement control bolt 10. May be provided. In short, flexible precast concrete perforated pipe 1
Each short and long precast concrete perforated pipe 2
The elastic packing material 7 is compressed to a moderate degree and held between the end surfaces of the a and 2b, and the short and long precast concrete perforated pipes 2a and 2b are connected by the movement control bolt 10 with some play. Just do it.

[0028]

The connection of the flexible precast concrete perforated pipe of the present invention is based on a thick elastic packing material interposed between the connecting end faces, and has a high flexibility corresponding to the deformation of the elastic packing material. The amount of deformation is limited to an appropriate amount or less by the movement control bolt. Therefore,
It is possible to cope with relative displacements in various directions and sizes within an appropriate amount range, and there is no danger of damage to the precast concrete porous tube main body and the packing material due to relative displacement due to uneven settlement or the like.

[Brief description of the drawings]

FIG. 1 shows an example of a flexible precast concrete perforated pipe of the present invention, wherein (a) is a longitudinal sectional view along the axial direction including a general precast concrete perforated pipe, and (b) is (a).
(C) is a CC cross-sectional view including the general precast concrete perforated pipe of (b).

FIGS. 2A and 2B show an example of an assembly of a guide pipe and an elastic packing material attached to a connection portion of a flexible precast concrete perforated pipe of the present invention, wherein FIG. 2A is a front view, FIG. (c) is a CC sectional view of (a).

3A and 3B show another example of an assembly of a guide pipe and an elastic packing material mounted on a connecting portion of a flexible precast concrete perforated pipe of the present invention, wherein FIG. 3A is a front view and FIG. (C) is a sectional view taken along the line CC of (a).

[Explanation of symbols]

1 ... flexible precast concrete perforated pipe, 2a, 2
b: short and long precast concrete perforated pipe, 3: through hole for cable, 3a: guide pipe storage section, 4 ...
Through holes for movement control bolts, 4a ... Nut mounting holes, 5 ...
... Connecting bolt insertion hole, 6 ... Notch for connecting work, 7 ...
Elastic packing material, 7a ... hollow hollow elastic plate, 8 ...
Guide pipe, 8a ... air flow hole, 9 ... general precast concrete perforated pipe, 10 ... movement control bolt,
11: Temporary steel plate, 12: Bolt fixing hole, 13: Connection bolt, 14: Long nut.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-9-65560 (JP, A) JP-A 62-19032 (JP, U) JP-A 63-50550 (JP, Y2) JP-A 45- 3221 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) H02G 9/00-9/12

Claims (1)

(57) [Claims] (A) A plurality of cable through-holes provided with a guide pipe housing portion having a larger hole diameter than the main body portion at a connection end side end portion, and a movement in which a nut attachment hole having a large hole diameter is formed at one end. (B) Inserting a guide pipe straddling the guide pipe storage portion of both precast concrete porous pipes and connecting between the connecting end faces of both precast concrete porous pipes. (C) A flexible precast concrete perforated pipe in which a movement control bolt is inserted between nut mounting holes of both precast concrete perforated pipes and both ends of which are mounted to the nut mounting holes by nuts.