JPS6035649Y2 - manhole - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a prefabricated manhole constructed by stacking a plurality of concrete blocks such as frame blocks, straight wall blocks, and inclined wall blocks.

This type of manhole is constructed by, for example, placing a chestnut foundation or the like at the bottom of excavated ground, laying a bottom slab block on top of this foundation, and placing a frame block, straight wall block, slanted wall block, etc. on top of this bottom slab block. It is generally constructed by stacking a plurality of concrete blocks, and then the blocks are backfilled with soil for use.

However, recent backfilling work is carried out using heavy equipment such as bulldozers, and therefore, during the work, unilateral earth pressure tends to act on the stacked blocks.

Therefore, unless the blocks are firmly joined to each other, there is a problem in that the blocks may become misaligned during backfilling work.

To deal with such inconveniences, for example, a plurality of stacked blocks may be tightly connected using a plurality of PC steel members penetrating from their upper ends to their lower ends.

However, when one of the blocks is a diagonal wall block as described below, it is difficult to simply pass through multiple PC steel members, and such a connection structure cannot be adopted. This is the current situation.

This invention was developed with a focus on these circumstances.
A passage extending continuously from the upper block to the lower block is provided in the concrete structure of the plurality of blocks to be connected, and the outer peripheral surface or the inner peripheral surface of the upper block and the lower block are communicated with the passage. Recesses are respectively provided, a connecting member is inserted into the passageway with each end thereof protruding into each recess, and each end of the connecting member is secured with a fastener disposed within each recess. Connecting means fixed in each of these concave portions are employed, and at positions corresponding to the steeply sloped portions of the diagonal wall block, only the cylindrical blocks present below the diagonal wall block are tightly connected by the connecting means. , by configuring the diagonal wall block and the cylindrical block to be tightly connected by the connecting means at a plurality of locations other than the steeply sloped portion, despite having the diagonal wall block, To provide a manhole in which each block can be firmly and easily connected to each other, and in which inconveniences such as displacement between blocks during backfilling work can be reliably prevented.

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

The manhole 1 shown in FIG. 1 is constructed by sequentially stacking a plurality of concrete blocks, that is, a bottom block 2, a frame block 3, straight wall blocks 4 and 5, and an inclined wall block 6.

To be more specific, the bottom block 2 is placed on the chestnut stone foundation 7,
It is a disc-shaped material laid with a mortar layer 8 interposed therebetween, and a positioning protrusion 2a is annularly protruded from the outer peripheral edge of its upper surface.

Further, the frame block 3 has a cylindrical shape with a lower end fitted inside the protrusion 2a of the bottom plate block 2,
Pipes 9 constituting a sewer system or the like are connected to required locations on the surrounding wall.

An invert 11 having an inverted arch-shaped groove 10 continuous to the v9 is placed at the bottom of the star block 3.

Further, the straight wall blocks 4 and 5 are connected to the frame block 3.
They are cylindrical bodies set to have the same diameter as , and are sequentially placed on the body block 3 with their axes aligned with each other.

Further, the slanted wall block 5 is placed on the straight wall block 5 with its lower end joint surface abutted against the upper end joint surface of the straight wall block 5, and the upper end side is eccentric. It is formed into a cylindrical body having a substantially truncated conical shape.

A receiving frame 13 for holding the lid 12 in an openable and closable manner is placed on the joint surface of the upper end of the slanted wall block 6 via a concrete adjustment ring 14 and a plurality of adjustment rubbers 15. and is fixed using receiving frame bolts 16.

In such a manhole 1, the inclined wall block 6
Only the cylindrical block 3.4.5 is tightly connected by the connecting means 31 at a position corresponding to the steeply inclined part 6a, and the inclined wall block 6 and the cylindrical block are connected at a plurality of positions other than the steeply inclined part 6a. The blocks 3, 4, and 5 are tightly connected by connecting means 32, respectively.

Therefore, this connecting means 32 connects a plurality of blocks to be connected, for example, the frame block 3, the straight wall block 4, and the like.
, 5 and the inclined wall blocks 6 are provided with a passage 17 extending continuously from the upper block 6 to the lower block 3.

Then, the upper block 6 and the lower block 3
A concave portion 18 communicating with the passage 17 is provided on the outer circumferential surface of each of the tubes.

Specifically, corrugated metal boxes 19 are buried in the outer peripheral surfaces of the blocks 3 and 6, and the inside of each box 19 is the recess 18, and the end wall of each box 19 is provided with the recess. A through hole 19a is provided to communicate the portion 18 and the passage 17, respectively.

Then, a connecting member, for example, a PC steel wire 21 having threaded portions 21a, 21a at both ends thereof is inserted into the passage 17 such that the threaded portions 21a, 21a protrude into the respective recessed portions 18, 1a. The P
Both ends of the C steel wire 21 are connected to the concave portions 1 of each of the blocks 3 and 6.
8.18, respectively.

The detailed assembly order of this connection structure is as follows.

First, the PC@ wire 21 is inserted into the passage 17 through the auxiliary passage 23, and the lower end side threaded portion 21 of the PC wire 21 is inserted into the passage 17 through the auxiliary passage 23.
a into the recessed part 18 of the body block 3, and the upper end side threaded part 21a is inserted into the recessed part 18 of the inclined wall block 6.
position within.

After fitting the anchor plates 24.24 to the threaded portions 21a, 21a, the nuts 22.22 are screwed together and temporarily tightened.

Next, the tension rod 25 having a threaded portion 25a at its tip is inserted, and the threaded portion 25a is caused to protrude into the recessed portion 18 of the slanted wall block 6.

Then, the threaded portion 25a of this tension rod 25 and the front PC steel wire 2
1 is connected to the upper end side threaded portion 21a of 1 through a turnbuckle-shaped connector 26.

Next, the tension bar 25 is pulled upward using a pressing tool 27 such as a hydraulic jack to apply a required tension to the PC steel wire 21, and in this state, the upper end side screw of the PC steel wire 21 is Tighten the nut 22 screwed onto the part 21a to permanently fix it (
(See Figure 3).

After that, the connector 26 is removed and the tension bar 2 is removed.
The work is completed by extracting 5.

Therefore, on the pCf$4 line 21, the upper 21 lock 3,
The connections 4, 5, and 6 are performed at a plurality of locations spaced apart at required intervals in the circumferential direction.

In addition, in the part where the inclined wall block 6 forms a steep slope (see the left end part in FIG. 1), only the frame block 3 and the straight wall blocks 4 and 5 are made of PCG similar to the PC steel wire 21.
They are connected using a line 21'.

That is, the connecting means 31 provided at a position corresponding to the steeply inclined part 6a of the inclined wall block 6 is connected from the upper block 5 to the lower block 3 within the concrete structure of the frame block 3 and the straight wall blocks 4 and 5. A continuous passageway 17 is provided.

Then, the upper block 5 and the lower block 3
A concave portion 18 communicating with the passage 17 is provided on the outer circumferential surface of each of the tubes.

Then, insert the PC steel wire 21' into the passage 17,
A nut 22 is fixed to this PC steel wire 21' in the same manner as described above.

If it has such a configuration, the PC steel wire 21...
Since a plurality of blocks 3.4.5°6 are interconnected by 21', each block 3,4,5.6
Even if an unbalanced load acts on blocks 3, 4, 5.
6 do not deviate from each other in the shear direction.

Therefore, during the backfilling work, each of the blocks 3, 4, 5,
Even if lateral pressure may act on block 6, each block 3,
There is no risk of misalignment between 4, 5, and 6.

In addition, the PC steel wires 21..., 21' are provided as reinforcing materials within the concrete structure of each block 3, 4, 5.6, so for example, the PC steel wires 21..., 21' It is possible to obtain a higher connection strength than when connecting blocks using a connection plate attached to the surface, and the desired number of blocks 3, 4 can be obtained by simply attaching nuts 22 and 22 at both ends. , 5°6 can be connected at the same time, making assembly easy.

In addition, if it is like this, each block 3.4.5.6 can be connected in a state where it is strongly tightened in the direction toward each other as described above, so each block 3.4.
．． Another advantage is that the sealing function at the joint between 5 and 6 can be easily enhanced.

Moreover, at the position corresponding to the steeply inclined part 6a of the inclined wall block 6, only the cylindrical block 3°4.5 existing below this inclined wall block 6 is connected by the PCf14 line 21', and the steeply inclined part 6a Since the inclined wall block 6 and the other blocks 3, 4.5 are connected at multiple locations other than the Block 3゜4, 5.
6 can be tightened.

In other words, although the manhole includes slanted wall blocks 6, each block 3, 4, 5.6 is connected to the PC steel wire 2.
1.21' allows for a reliable tight connection.

In addition, by making the number of block connection stages different in the positions corresponding to the steeply inclined portions 6a of the slanted wall block 6 in this manner, the inconvenience of mounting the slanted wall block 6 in the wrong direction will not occur.

Therefore, block 2,
The inclined wall block 6 can be mounted on the 3.4 in the designed orientation without error.

Therefore, it is also possible to improve the workability of assembling the manhole.

In addition, in the above embodiment, a case was explained in which the connecting member was a PC steel wire and the fastener was a nut, but it goes without saying that the present invention is not limited to such a thing, and the gist of the present invention is not limited to this. Various modifications are possible without departing from the above.

For example, other examples of the connecting member include PC steel bars and regular reinforcing bars.

Furthermore, it goes without saying that the number of blocks connected by a common connecting member is not limited to 3 or 4; for example, 2
The number may be five or more.

Furthermore, the recessed portion may be provided not only on the outer peripheral surface of the block but also on the inner peripheral surface.

Further, a water-stopping rubber material or the like may be interposed between the joint surfaces of each block as necessary.

Because the present invention has the above-mentioned configuration, it is possible to easily and accurately connect multiple blocks including slanted wall blocks, and it is possible to reliably avoid the inconvenience of misalignment between blocks during backfilling work. It is possible to provide a manhole that can prevent the above.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing the main parts, and FIG. 3 is an explanatory view for explaining an assembly method. 1... Manhole, 3... Block (
<body flock), 4, 5... block (straight wall block), 6... block (slanted wall block),
17... Passage, 18... Recessed portion, 21
...Connecting member (PC steel wire), 22...
Fastening device (Natsuto).

Claims (1)

[Scope of utility model registration request] A diagonal wall block, which has a substantially truncated conical shape with an eccentric upper end and has a steeply sloped part of the peripheral wall, is stacked on top of multiple concrete cylindrical blocks such as frame blocks and straight wall blocks. In the manhole to be constructed, only the cylindrical block is tightly connected by a connecting means at a position corresponding to a steeply sloped portion of the sloped wall block, and the sloped wall block and the cylinder are connected at multiple locations other than the steeply sloped portion. shaped blocks are tightly connected by connecting means, and each connecting means creates a passageway extending continuously from the upper block to the lower block in the concrete structure of the plurality of blocks to be connected. established,
A concave portion communicating with the passage is provided on the outer circumferential surface or the inner circumferential surface of the upper block and the lower flock, respectively, and a connecting member is inserted into the passage with each end thereof protruding into each of the concave portions. The manhole is characterized in that each end of the connecting member is fixed in each of the concave portions by a fastener provided in each of the concave portions.