JPH0612054Y2 - Concrete block for manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete block for manholes, such as a cubic block, a straight wall block, or a swash wall block, which is used when constructing an assembled manhole.

[Prior Art] Recently, an assembly type manhole constructed by stacking a black block, a straight wall block, a swash wall block, etc. has been developed. Then, in this type of manhole, embedded nuts are embedded in the joint ends of each block at equal intervals, and adjacent to the screw holes of the embedded nuts opened at the joint ends of each block. A well-known method is one in which bolts are screwed from the other block side to tightly join the blocks.

By the way, the body block and straight wall block used for this type of manhole are molded in a horizontal posture like a fume pipe, so after removing the mold, one end side is lifted with a crane etc. for a stable vertical posture. Need to wake up. Also,
When you take it out of the factory or when you bring it to the site, or
It is indispensable to move by lifting when arranging it at a required place on site. With this type of system, however, a hanging metal fitting is connected to the embedded nut via a bolt during such a lifting operation, and a hanging wire is hooked on these hanging metal fittings.

[Problems to be solved by the invention] However, such an embedded nut is provided near the inner circumference of each of the blocks in order to correspond to the location of the connection box or the like embedded in the other block to be joined. It is generally buried. Therefore, a large tilting force may be applied to the embedded nut when the block is connected to the embedded nut via a bolt and the block or the like is lifted or raised from the sideways posture. As a result, the embedded nut and the concrete structure are separated from each other, which may cause rattling of the embedded nut. In particular, when a large force acts on the embedded nut in the direction of the center of the block, the inner peripheral portion of the relatively thin block is often lost.

In order to deal with such a problem, in addition to the embedded nut embedded on the joint surface side of the block, an embedded nut dedicated to lifting is embedded on the outer peripheral surface of the block has also been developed. In that case, the number of insert parts increases, the mold becomes complicated, and molding becomes troublesome.

The present invention aims to solve all of the above problems.

[Means for Solving Problems] The present invention takes the following means in order to achieve such an object. That is, the concrete block for a manhole according to the present invention has an embedded nut embedded in a concrete structure with a tip end surface having a screw hole exposed at a joining end, and is fixed to a portion near the tip of the embedded nut. A tubular shape having an anchor bar embedded in the concrete structure as a whole, the anchor bar having a U-shape.
A central portion curved in a letter shape is wound around and fixed to a portion on the inner peripheral surface side of the block on the outer periphery of the embedded nut, and both legs of the anchor bar extending from the central portion to the outer peripheral surface side of the block are parallel to the joint end. In addition to extending, the distal end portions of both leg portions are further bent by approximately 90 ° so as to hang down to a portion located below the lower end of the embedded nut.

[Operation] With such a structure, the tilting force that acts on the embedded nut when lifting or pulling up the block or straight wall block is fixed to the vicinity of the tip of the nut. The whole can be dispersed by the anchor streak embedded in the concrete structure. As a result, when hoisting those blocks, force is concentrated from the embedded nut to a specific location on the block, causing a defect at that location, or peeling between the embedded nut and the concrete structure. It is possible to effectively prevent such troubles. That is, since the central part of the anchor bar is wound and fixed to the embedded nut and both legs are composed of a part parallel to the joint surface and a part substantially parallel to the outer peripheral surface, the pulling force upward and the side It has a high drag force against both the tilting force toward one side.

Moreover, since the central portion of the anchor bar curved in a U shape is wound around the inner peripheral surface of the block at the outer periphery of the embedded nut, the welding between the embedded nut and the anchor bar is temporarily incomplete.
Even if the welded part may come off during the suspending work, the anchor bar can continue to limit at least the fall of the embedded nut toward the inner peripheral surface of the block. Therefore, it is possible to effectively prevent a problem that the welded joint between the embedded nut and the anchor bar is disengaged during the suspending operation and the inner peripheral surface side of the thin block is broken.

Also, since the tip parts of both legs are hung below the lower end of the nut, it is possible to weld to the main bar normally embedded in the concrete structure. Will be more secure.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The manhole 1 shown in FIG. 1 comprises a plurality of concrete blocks, that is, a bottom block 2 and a cubic block 3.
And the straight wall block 4 and the slanted wall block 5 are sequentially stacked. More specifically, the bottom block 2
Is a disc-shaped material that is laid on the stone base 6 through the mortar layer 7, and has an annular joint end 2a on the outer peripheral edge of the upper surface thereof.
And a positioning projection 2b is provided in an annular shape on the outer peripheral edge of the joining end 2a.

The rectangular block 3 has a cylindrical shape in which the lower end portion is fitted inside the protrusion 2b of the bottom slab block 2 and the downward joint end 3a is joined to the upward joint end 2a of the bottom slab block 2. The pipe 8 constituting the sewer is connected to a required portion of the peripheral wall. And this body block 3
An invert 11 having an inverted arch-shaped groove 9 continuous with the pipe 8 is placed at the bottom of the inside.

In addition, the straight wall block 4 has a downward joining end 4a.
It is formed of a cylindrical body mounted on the body block 3 by abutting the upwardly-facing joint end 3b of the body block 3.

The slanted wall block 5 is mounted on the straight wall block 4 with its downward joint end 5a abutting against the upward joint end 4b of the straight wall block 4, and has an eccentric upper end. It is formed in the shape of a cylindrical head cylinder.

A receiving frame 13 that holds the lid 12 in an openable and closable manner is mounted on the upward joint end 5b of the slanted wall block 5 via an adjusting ring 14 made of concrete and a plurality of adjusting rubbers 15, and the receiving frame bolt It is fixed using 16.

In this way, the bottom slab block 2 and the tubular concrete blocks 3, 4, 5 according to the present invention are stacked to construct the manhole 1.
3, 4 and 5 are embedded nuts 17 having screw holes 17a,
The embedded nut 17 is provided with an anchor streak 18 fixed to a portion 17b near the tip of the embedded nut 17.

More specifically, embedded nuts 17 each having a screw hole 17a are vertically embedded on the upper end side of each of the blocks 2, 3, 4, and 5 at three equiangular intervals on the circumference.
The tip surface 17c is exposed at the upward joining ends 2b, 3b, 4b, 5b of the blocks 2, 3, 4, 5.
Then, the tip vicinity portion 17b of each of these embedded nuts 17
Anchor streak 18, which is entirely embedded in concrete structure, is fixed to this.

The anchor streak 18 is of a rebar shape, and has a central portion 18a curved in a U shape and a portion 17b near the tip of the embedded nut 17.
It is wound around the inner peripheral surfaces 3d, 4d, 5d of the block on the outer periphery thereof and is fixed by welding along the location 17b. Then, the both leg portions 18d, 18e side thereof are made parallel to the joint ends 2a, 3b, 4b, 5b of the blocks 2, 3, 4, 5 and extended in the respective outer peripheral surfaces 2c, 3c, 4c, 5c. At the same time, it is further bent approximately 90 ° in the vertical direction, and the tips 18d, 18e of both leg portions 18b, 18c thereof are
Is hung down to a portion located below the lower end 17d of the embedded nut 17.

On the other hand, at the three places on the downward joint ends 3a, 4a, 5a side of the body block 3, the straight wall block 4, and the swash wall block 5 corresponding to the embedded nut 17 and the anchor streak 18, respectively, there are made of iron. A box 19 for connection is buried. The box 19 is of a casing type having openings on the inner peripheral surfaces 3d, 4d, 5d of the rectangular block 3, the straight wall block 4, and the slanted wall block 5, and the outer surface of the end wall 19a of each box 3, 4, 5 ,.
Of the connecting bolts 21 are exposed at the joint ends 3a, 4a, and 5a of the connecting hole 21a, and the through holes 19 of the connecting bolts 21 are formed at substantially the center of the end wall 19a.
b is provided. An anchor 22 for firmly embedding the box 19 in each of the blocks 3, 4, 5 is fixed to the outer surface of the other end wall 19c of the box 19 by welding.

When the manhole 1 is constructed by connecting the slab block 2, the rectangular block 3, the straight wall block 4, the sloping wall block 5 and the like having the above-mentioned configuration, each of the upward joining ends 2
Each block is mounted while fitting the protrusions 25 annularly provided on the downward joint ends 3a, 4a, 5a into the sealing grooves 24 annularly provided on a, 3b, 4b. When tightening the adjacent blocks 2, 3, 4, 5 together, the bolts 21 should be tightened with the washer 23 interposed between the end wall 19a of each box 19 and the head 21a of the bolt 21. To firmly connect each block,
After that, each box 19 is filled with mortar 26.

As described above, the bottom block 2, the black block 3,
The manhole 1 is constructed by stacking the straight wall blocks 4, the slanted wall blocks 5, etc., but these blocks 2, 3, 4, 5 produced in the factory are raised or brought into the site. Then, when stacking sequentially, it can be moved as follows. For example, a bolt 27 is screwed into a screw hole 17a of each embedded nut 17 arranged on the joint end 3b side of the metal block 3, and a hanging metal fitting 28 such as a U-shaped hook connected to the bolt 27 is used. Connect the wires collected at the upper center part of the body block 3 to the body block 3
Will be raised or lifted. And
In this way, the straight wall block 4, the swash wall block 5, etc. are also lifted.

With such a structure, when the body block 3, the straight wall block 4, the swash wall block 5, etc. are lifted or raised, they are buried on the respective joint ends 3b, 4b, 5b. The tilting force acting on the embedded nut 17 can be dispersed and relaxed by the anchor muscles 18. As a result, when the blocks 3, 4, 5 and the like are lifted or pulled up from the tilted state, the tilting force or the like causes
It is possible to effectively prevent chipping that easily occurs on the inner peripheral surfaces 3d, 4d, and 5d side, or rattling of the embedded nut 17 due to separation of the embedded nut 17 from the concrete structure.

Moreover, the central portion 18 of the anchor muscle 18 curved in a U shape
a is the inner peripheral surface 3 of the block on the outer periphery of the embedded nut 17.
Since it is wound around the a, 4a, and 5a sides, even if the welding of the embedded nut 17 and the anchor bar 18 is incomplete and the welded part may come off during the suspending work, The anchor lines 18 can continue to limit the tilting of the embedded nut 17 in the directions of the block inner peripheral surfaces 3a, 4a, 5a. Therefore, the welding connection between the embedded nut 17 and the anchor bar 18 is released during the suspending work, and the thin inner peripheral surface 3 of the block is removed.
It is possible to effectively prevent the problem that the d, 4d, and 5d sides are destroyed.

Also, due to the anchor muscles 18 fixed to the embedded nut 17,
The embedded nut 17, the anchor muscle 18, and each block 2,
Since the bondability with the concrete structure forming 3, 4, 5 is improved, the tightening force when connecting the adjacent blocks to each other through the bolts 21 can be improved, and the positional displacement between the blocks can be prevented. It is also possible.

In this embodiment, the anchor bar 18 is firmly fixed to the embedded nut 17 by welding, and the legs 18b and 18c of the anchor bar 18 are joined to the joint ends 2a, 3b, 4 and 4.
Since it is bent in a vertical direction from a direction parallel to b and 5b, the embedded nut 17 can be reliably supported even when a vertical force or a tilting force acts on the embedded nut 17. Has become. That is, the anchor muscle 18
Does not exert a great resistance against the force acting in the axial direction, but if the legs 18b and 18c are bent as described above, the external force can be applied to the embedded nut 17 from any direction. Even if it acts, it is impossible that the axial force acts on the entire anchor muscle 18 at the same time. for that reason,
It is possible to exert high nut support strength. Moreover, since the tips 18d and 18e of the two leg portions 18b and 18c are hung below the lower end of the nut 17, the tips 18d and 18e are welded to a main bar (not shown) that is usually embedded in the concrete structure. Of course, it is possible to do so, and of course, the embedded nut 17 can be more reliably supported by doing so.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention.

[Advantages of the Invention] As described above in detail, in the present invention, the anchor bar entirely embedded in the concrete structure is provided in the vicinity of the tip of the embedding nut having the screw hole and embedded in the concrete structure. Since it is fixed, even if a slight tilting force acts on the embedded nut, it is possible to obtain a reliable and stable joint state between the concrete structure forming the manhole and the embedded nut. It is possible to effectively and effectively prevent the concrete block from falling off when moving or the like.

In particular, in the present invention, since the inner peripheral surface of the embedded nut is wrapped by the central portion of the anchor bar curved in a U shape, it is assumed that the embedded nut and the anchor bar are welded during suspension work. Even if it comes off, it is possible to continue to limit the tilting of the embedded nut in the direction of the block inner peripheral surface by its anchor streak, effectively preventing damage to the thin block inner peripheral surface portion. Is something that can be done.

In addition, since the anchor muscle of the present invention has the curved shape as described above, it exerts a high resistance against both the pulling force in the vertical direction and the tilting force to the side. Yes, it becomes possible to reliably support the embedded nut.
Moreover, since the tip portions of both legs of the anchor bar are hung below the lower end of the nut, it is possible to weld to the main bar that is normally embedded in the concrete structure, and the embedded nut support Can be made more reliable.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a manhole, FIG. 2 is an enlarged view of a main part, and FIG. 3 is a perspective view showing the main part. 1 ... Manhole, 2 ... bottom plate block 2a ... joint edge, 2b ... projection 2c ... outer peripheral surface, 3 ... body block 3a, 3b ... joint end, 3c ... block outer peripheral surface 3d .... Inner surface of block 4 ... Straight wall block, 4a, 4b ... Joining end 4c ... Outer surface of block 4d ... Inner peripheral surface of block 5 ... Slanted wall block, 5a, 5b ... Joining end 5c ... Outer circumference of block Surface 5d …… Inner surface of block 6 …… Kuriishi foundation, 7 …… Flat mortar 8 …… Tube, 9 …… Groove 11 …… Invert, 12 …… Lid body 13 …… Receiving frame, 14 …… Adjustment ring 15… … Adjustment rubber, 16 …… Receiving frame bolt 17… Embedded nut, 17a… Screw hole 17b… Near tip, 17c… Tip surface 17d… Lower end, 18… Anchor streak 18a… Center part 18b, 18c ... legs 18d, 18e ... tip 19 …… Box, 19a, 19c …… End wall 19b …… Through hole, 21 …… Bolt 22 …… Anchor, 23 …… Washer 24 …… Seal groove, 25 …… Ridge 26 …… Mortar, 27 …… Bolt 28 ... Hanging bracket

Claims (1)

[Scope of utility model registration request] 1. An embedding nut embedded in a concrete structure by exposing a front end surface having a screw hole to a joint end, and an embedding nut fixed to the vicinity of the tip of the embedding nut so that the whole is in the concrete structure. A cylindrical concrete manhole block having embedded anchor bars, wherein a central portion of the anchor bar curved in a U shape is wound around a portion on the inner peripheral surface side of the block on the outer circumference of the embedded nut. Firmly fixed,
Both leg portions of the anchor bar extending from the central portion to the outer peripheral surface side of the block are extended in parallel to the joint end, and the tip portions of the both leg portions are further bent by approximately 90 ° to make the anchor nut be lower than the lower end of the embedded nut. A concrete block for manholes, which is hung down to the part located below.