JP3249057B2 - Filter system for manhole wellhead - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a starting shaft and a reaching shaft in a propulsion method.

[0002]

2. Description of the Related Art Conventionally, when constructing a manhole, a shaft is usually provided and earth retaining work is performed by a steel sheet pile method, a lightweight steel sheet pile method, a wood sheet pile method, an H steel horizontal sheet pile method, a liner plate method, or the like. After the excavation, the foundation concrete is poured in, a chemical solution is injected for the purpose of stopping water, the earth and sand near the pit is solidified to prevent the inflow, and then the propulsion work is performed to reduce the sewer pipeline. After the installation, the manhole has been installed.

However, in the above manhole construction method,
In addition to the cost and time required for chemical injection work, earth and sand excavated in the propulsion work on the ground into which chemical liquid has been injected needs to be treated as industrial waste in order to prevent contamination of groundwater by the chemical liquid. On the other hand, if there is no chemical liquid injection work, there is a problem that earth and sand flow in from the wellhead and the nearby ground collapses, so that the propulsion work itself becomes difficult.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to reduce the cost and time required for propulsion work by eliminating the need for chemical solution injection work, to reduce industrial waste, and to prevent the ground near the wellhead from sinking. Is the subject.

[0005]

Therefore, the present invention is based on the premise that the manhole frame block itself is directly buried in the ground by rocking press-fitting or rotation to simplify the construction, and the filter material is used as the filter material. It is characterized in that although provided at the wellhead, although there is inflow of water, the above problem is solved by a technical concept that prevents inflow of earth and sand and facilitates propulsion work. Therefore, the invention of claim 1 is configured to include a cylindrical manhole skeleton block, an annular member coupled to a peripheral end of the manhole skeleton block, and a wellhead provided in the manhole skeleton block. A manhole pit filter device applied to a manhole, comprising: an annular fixing member fixed to the wellhead; a water stopping member provided on the fixing member; and a water stopping member provided in front of the water stopping member. Thus, a filter device for a manhole wellhead, comprising a water-permeable filter member. The “manhole frame block” is generally preferably made of concrete or the like. In general, the "annular member" is preferably made of steel or the like, and is used to connect the manhole skeleton blocks. It is generally preferable that the “headhole” is formed in a circular shape . Generally, the “fixing member” is preferably made of steel or the like, and is for fixing the “water blocking member”.
During the propulsion work, “water-stopping material” causes sediment containing water contained below the ground (hereinafter referred to as groundwater) to enter the manhole.
Is intended to prevent the entry immersion is generally a preferred rubber. The “permeable filter member” is made of a material having the property of being able to prevent inflow of earth and sand, although there is inflow of groundwater.
Paper, sponge, cloth, wire mesh, mat and the like are suitable.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a filter device 3 for a manhole 1 according to an embodiment will be described with reference to FIGS.
First, the manhole 1 shown in FIGS. 1 and 2 includes a first manhole skeleton block 2, an intermediate manhole skeleton block 5, and an intermediate manhole skeleton block 5, which are connected to and communicate with the small propulsion pipes 4a and 4b via the filter device 3. Building block 5
And a final manhole skeleton block 6 which is vertically joined to the upper part of the frame. Each skeleton block is connected by Gaidoko' motor 2 6, 56. As shown in FIG. 2, a seal 9c is provided on each joint surface.
At the bottom of the first manhole skeleton block 2, a foundation underwater concrete 7 is cast, and an invert 8 is placed thereon. The connection casing 67 is detachably connected to the intermediate manhole skeleton block 5, and is detached in the final step of the manhole construction work so that the earth and sand are backfilled.

The first manhole frame block 2 shown in FIGS. 1 and 2 has a steel blade-shaped member 21 fitted and fixed to the lower end of an annular concrete block 20, and a steel annular member at the upper end edge. 22 are fitted and fixed. In the intermediate manhole frame block 5, steel annular members 51 and 52 are fitted and fixed to the upper and lower ends of the concrete block 50, respectively. Final manhole frame 6
Are an adjustment block 61 vertically connected to the upper end of the intermediate manhole frame block 5, a side block 60 vertically connected to the upper end of the adjustment block 61, and a bolt and nut (not shown) on the upper end of the side block 60. The receiving frame 62 is fixed with a washer, and the lid 68 is detachable from the receiving frame 62. A step 69 is provided on the inner peripheral surface of the final manhole frame block 6. Step 69
Is installed in the final stage of the manhole construction work, and is installed only in the upper half.

The first manhole frame block 2 shown in FIGS. 3 (a) to 3 (d) will be described.
8 are vertically fixed (welded) at predetermined intervals, and are buried and integrated with the peripheral edge of the lower end portion of the annular concrete block 20. Similarly, the steel annular member 2
Reinforcing bars 28 as reinforcing bars are vertically fixed (welded) to the inner peripheral surface of the concrete block 2 at predetermined intervals, and they are buried and integrated with the periphery of the upper end of the concrete block 20. At the lower end of the blade-shaped member 21, a plurality of saw teeth are arranged circumferentially. The lower end of the concrete block 20 has a tapered inner peripheral surface in order to reduce the resistance at the time of rocking press-fitting. Ring member 22
Wedge-shaped male guide cotter 2 symmetrically arranged at the upper end
3 and 24 are projected upward, and two female guide cotters 25 and 26 are recessed downward. The male guide cotters 23 and 24 and the female guide cotters 25 and 26 are alternately arranged, are convenient for alignment, are hard to come off, and easily transmit a strong swinging pressure. Each is provided with a bolt mounting hole 27, and the displacement of the guide cotter can be prevented by the bolt and nut. The above elements of the first manhole frame 2 are manufactured integrally in the manhole manufacturing process.

FIGS. 4 to 6 show a filter device 3 which is a characteristic configuration of the present embodiment. As shown in FIG. 5, two round through holes 29 are formed in the first manhole body block 2 at positions symmetrical to the wall of the first manhole body block 2 in the horizontal direction, and the filter devices 3 are respectively formed in the through holes 29 in the manufacturing process. They are fixed together. Since the filter device 3 is incorporated in the first manhole body block 2 in advance, there is water inflow at the time of mirror cutting at the start of the small-diameter propulsion construction method, but the earth and sand do not enter the manhole. It is possible to carry out a small caliber propulsion work. As shown in FIGS. 4 to 6, the filter device 3 is fixed to the inner wall of the through hole 29 and closes the through hole 29. The filter device 3 includes a cylindrical fixing bracket 31 formed by welding two flanges 30a and 30b inside at predetermined intervals,
A disc-shaped rubber in which a predetermined number (for example, six) of bolt insertion holes 32 are drilled at predetermined intervals between the flanges 30a and 30b, and a bolt insertion hole 33 is provided between the flanges 30a and 30b. Plate 34, and between the rubber plate 34 and the flange 30b, the bolt insertion hole 35
Are provided, and a steel protection plate 38 provided inside the flange 30b and provided with a bolt insertion hole 37 is provided. Then, bolts 39a are inserted into the bolt insertion holes 32, 33, 35, 37.
Through, and tighten and fix with the tightening nut 39b,
The through hole 29 is sealed.

A further characteristic feature is that the rubber plate 34
A filter member 70 is provided on the front surface of the device, and its front surface is exposed to the outside, and its rear surface is strongly fixed to the flange 30a with an adhesive. The presence of the filter member 70 prevents groundwater from flowing into the manhole 1 from the ground, but prevents the ground from sinking, despite the inflow of groundwater. Therefore, when installing the small-diameter propulsion pipe, it is not necessary to inject a chemical solution, the cost and the construction period can be halved, and industrial waste can be eliminated. Here, as a specific example of the filter,
For example, there are many examples such as a laminate of coconut skin, a straw-filled one, a laminate of water-resistant paper, a thick cloth, a laminate of fine wire mesh, and a thick mat. In addition, each said element is integrally manufactured in a manhole manufacturing process, and the filter device 3 is previously attached to the first manhole frame 2 .

Next, the construction procedure of the manhole 1 according to the present embodiment will be briefly described. This is performed by directly burying the manhole body block itself in the ground by rocking press-fitting or rotating (turning) or the like. The simplification is the main purpose, and the details are disclosed in the invention of Japanese Patent Application No. 7-240859 of the present applicant ( see Japanese Patent Application Laid-Open No. 9-6020 ). (1) The first manhole frame block 2 is pressed into the ground by a rocking press machine (not shown). (2) The first manhole skeleton block 2 and the intermediate manhole skeleton block 5 are connected. (3) A block in which the first manhole frame block 2 and the intermediate manhole frame block 5 are united is pressed into the ground by a rocking press machine (not shown). (4) The intermediate manhole skeleton block 5 and the final manhole skeleton block 6 are connected. (5) The first manhole skeleton block 2 and the intermediate manhole skeleton block 5 are buried underground by a rocking press machine (not shown).
And a block in which the final manhole skeleton block 6 is united. (6) At the bottom of the first manhole skeleton block 2, a foundation underwater concrete 7 is cast, and an invert 8
Is installed. (7) Remove the tightening nut 39b, remove the protection plate 38, and tighten again with the tightening nut 39b. (8) When the propulsion work is performed by the propulsion pipe, as shown in FIG. 7, the propulsion work of the fore-edge propulsion pipes 4a and 4b is performed. If the connecting casing 67 of FIG. The manhole 1 shown is completed.

The operation and effect of this embodiment are as follows. The construction period is shortened by directly burying each manhole frame block. Further, the chemical solution injection work for the propulsion work is not required, and the cost and the construction time of the propulsion work are reduced. Halved, and industrial waste can be eliminated.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many technical solutions may be provided without departing from the technical spirit of the present invention. Of course, modifications can be made.
As an example, in the embodiment, the rear surface of the filter member 70 is strongly fixed to the flange 30a with an adhesive,
The filter member 70 is fixed to the flange 30a by using various fittings such as fixing it with the flange 30a or a ring-shaped fitting extending from the fixing fitting 31 from the front side.
It is also possible to achieve the same effect by changing to fixing to.

[0014]

According to the first aspect of the present invention, in the propulsion method, the injection of a chemical solution is not required, the cost and period of the propulsion work can be reduced, industrial waste can be reduced, and the ground near the wellhead can be prevented from sinking. The effect of this is that the industrial use value is great.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional perspective view of a manhole in a state after a manhole skeleton block is connected and buried in the ground.

FIG. 2 is a longitudinal sectional view of the manhole.

3 (a) is a flat plane view of the first manhole skeleton block, (b) is a front view of the female guide cotter, (c) is a front view of a first manhole skeleton block, (d) the first manhole skeleton FIG. 3 is a partial vertical sectional view of a block.

FIG. 4 is a partially enlarged view of the vicinity of the filter device taken along the line AA in FIG.

FIG. 5 is a sectional view taken along line BB of FIG. 3 (c).

6 is a partially enlarged view of the vicinity of the filter device of FIG.

FIG. 7 is a vertical cross-sectional view showing the vicinity of a filter device of a manhole, showing a state of propulsion work.

[Explanation of symbols]

1 manhole 2 first manhole skeleton block 3 filter device 4a, 4b small propulsion tube 5 intermediate manhole skeleton block 6 last manhole skeleton block 7 basic water concrete 8 inverted 70 filter over member

Claims (1)

(57) [Claims] 1. A manhole comprising a cylindrical manhole body block, an annular member coupled to a peripheral end of the manhole body block, and a wellhead provided in the manhole body block. A filter device for a manhole wellhead, comprising: an annular fixing member fixed to the wellhead; a water-stopping member provided on the fixing member; and a water-permeable filter disposed in front of the water-stopping member. A filter device for a manhole wellhead, comprising a member.