JPH10168917A - Caisson prefabricated manhole and execution method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caisson prefabricated manhole and an execution method thereof, in which a bottom plate block can be fixed easily, surely and firmly and a construction period is shortened while construction cost can be reduced and which can be executed even at the place of spring water. SOLUTION: In the caisson prefabricated manhole, at least one cylindrical block 4 is placed on the top face of a cylindrical cutting-edge block 1 and connected and fixed integrally with the cutting-edge block 1, a bottom plate block 12 having an inclined plane, in which a peripheral surface is expanded downwards, is inserted into the lower section of the cutting-edge block 1, and waterproofing is executed to a wedge-shaped opening section 21 formed by the periphery of the bottom plate block 12 and the lower inner circumferential surface of the cutting-edge block 1. Connecting fittings 22 consisting of an angle material are placed on the periphery of the top face of the bottom plate block 12, and bolts 26, 26, 27 screwed to buried metal fittings 2, 15 buried to the bottom plate block 12 and the cutting-edge block 1 are inserted from the bolt inserting holes 25a, 25a, 24a of the perpendicular planes 25 and horizontal planes 24 of the connecting fittings 22 and the bottom plate block 12 is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting point, a meeting point, a crossing point, a branching point, etc. of an underground line used when laying a transmission line, a distribution line, a communication line, etc. underground. Perforated doors for inspection and repair, etc. More specifically, caisson-type manholes using prefabricated blocks manufactured under complete quality control at factories and their construction methods It is about.

[0002]

2. Description of the Related Art Conventionally, a human hole is provided at a starting point of an underground line used for burying a transmission line, a distribution line, a communication line and the like. As the human hole, a prefabricated underground structure disclosed in Japanese Patent Publication No. 49857/94 as shown in FIGS. This prefabricated underground structure
A vertical fixing bracket 41 and an inclined fixing bracket 42 are embedded in the lowermost prefabricated block 40 to be stacked, and a bottom plate prefabricated block 43 having a size just inserted into the lowermost prefabricated block 40 is attached to the lowermost prefabricated block 40. A waterproofing treatment 44 is applied to the inside of the prefabricated block 40 and fitted.
Bolts 45 and 46 are inserted from the upper surface side and the inner surface side of the lowermost prefabricated block 40, and the fixing brackets 41 and 42 are inserted.
, And a bottom plate prefabricated block 43 is attached to the lowermost prefabricated block 40 while ensuring watertightness.

In this prefabricated underground structure, when the bottom plate prefabricated block 43 is fixed, the bolt 46 is inserted into the inclined hole 47.
And screwed into the inclined fixing fitting 42, but since the inclined fixing fitting 42 is not visible, it is difficult to screw the bolt 46 into the inclined fixing fitting 42, it takes time to mount, and the workability is poor. In particular, if mud or sand enters the inclined hole 47 due to spring water or the like, it may not be sufficiently tightened and may not be assembled. Also, since the lowermost prefabricated block 40 is larger than the block 48 placed thereon,
Since loosening of the outer soil occurs, it is necessary to inject a chemical solution to solidify the outer soil. Further, since the structure depends only on the strength of the bolt, there was a concern about durability. After the mounting, all the reaction forces acting on the bottom plate prefabricated block 43 are applied to the bolts 46 and the bottom plate prefabricated block 4
There was a possibility that the concrete at the bolt fixing portion of No. 3 might be damaged by pulling.

On the other hand, when a caisson prefabricated manhole is constructed, spring water is generated depending on the soil properties of the ground, and countermeasures are required. As a conventional spring water countermeasure, a chemical liquid is injected to stop the water. Injection method. A pneumatic method that stops compressed water by sending compressed air into a caisson hole. Underwater concrete method that excavates underwater, places underwater hardened concrete, makes temporary bottom plate and stops water. We use a well point method to lower the water level in the construction area by hitting a water suction pipe around the caisson hole, but all said that special equipment and tools were required, which increased construction costs and significantly increased construction time. There was a problem.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and the bottom plate block can be easily and securely fixed firmly to shorten the construction period. In addition, an object of the present invention is to provide a caisson prefabricated manhole and a construction method thereof that can be easily performed in construction cost reduction and construction at a spring location.

[0006]

As a means for solving the above-mentioned problems and achieving the object, according to the present invention, at least one cylindrical block is mounted on the upper surface of a cylindrical blade block. The bottom plate block is connected and fixed integrally with the block, and the bottom plate block having an inclined surface whose peripheral surface expands downward is inserted into the lower part of the blade port block, and is formed by the periphery of the bottom plate block and the lower inner peripheral surface of the blade port block. A waterproofing treatment is applied to the wedge-shaped opening, and a connection fitting made of an angle material is placed on the peripheral edge of the upper surface of the bottom plate block, and a bolt that is screwed with the buried fitting embedded in the bottom plate block and the blade block is vertically connected to the connection fitting. Developed a caisson prefabricated human hole configured to fix the bottom plate block by inserting it through the bolt insertion hole on the surface and the horizontal surface,
Adopted.

According to the present invention, in the caisson prefabricated human hole configured as described above, the blade block has an inclined surface inclined from the inside to the outside on the inner surface and an inclined surface inclined from the outside to the inside at a small angle. The caisson prefabricated human hole and the bottom plate block, which are provided with a cutting edge having an outer surface, are divided into at least two parts so that a water collecting basin is formed in one of the bottom plate blocks, and a drainage pump is fitted into the water collecting basin. The caisson prefabricated manhole which is composed of was developed and adopted.

Further, in the present invention, a hole having a predetermined size is excavated in the ground, a cylindrical cutting block is placed in the hole, and at least one cylindrical block is placed on the upper surface thereof. After being connected and fixed integrally with the blade port block, excavating the soil at the bottom from the inside of the cylindrical block and sinking it to a predetermined position by its own weight, and leveling the bottom ground to a horizontal plane, the bottom plate block divided at least into two parts A caisson prefabricated manhole construction method characterized in that when spring water is inserted inside the caisson prefabricated manhole, the spring water is discharged by a drainage pump fitted to the water collecting basin provided on one bottom plate block Developed and adopted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. Reference numeral 1 denotes a tubular prefabricated blade block having a rectangular planar shape, as shown in an enlarged view in FIG. The tip portion is coated with concrete with a steel plate 1a so as to sufficiently receive the impact force received at the time of sinking. To facilitate sinking of the tip portion, the inner surface of the cutting edge is set to about 55 from the inside to the outside. It is formed on an inclined surface 1b that is inclined at an angle of ° to 65 °. Also, in order to prevent loosening of the outer soil of the cutting edge and eliminate gaps even in soils with a lot of pebbles, the outer surface of the cutting edge is formed on an inclined surface 1c which is inclined inward at an angle of about 5 ° from the outside to the inside. To form a sharpened shape.

Reference numeral 2 denotes burying metal fittings embedded in recesses 3 formed at predetermined intervals on a lower inner peripheral surface of the blade opening block 1, and two burying metal fittings are vertically embedded. It is screwed.

Reference numeral 4 denotes a cylindrical block mounted on the upper surface of the blade port block 1, which is made of the same prefabricated shape and the same size as the blade port block 1. The blade block 1 and the cylindrical block 4
As shown in FIGS. 1, 3, and 5, bolt holes 5, 5, 5,... Drilled at predetermined locations on the upper end face of the blade block 1 and drilled at predetermined locations on the lower end face of the tubular block 4. The bolt holes 6, 6, 6,... Are aligned with each other, a bolt 9 is inserted through a recess 7 provided on the joint surface, and a nut 10 is screwed into the recess 8 to be integrally joined. Numeral 11 is a circular hole for inserting the end of the underground pipeline formed on both side walls of the blade block 1 and the cylindrical block 4.

Reference numeral 12 denotes a rectangular prefabricated bottom plate block which fits into the lower inner surface of the blade block 1, and is divided into a left block 12a and a right block 12b, and as shown in FIGS. The peripheral surfaces of 12a and 12b are formed on an inclined surface 13 expanding downward, and round holes 14 are formed in the peripheral portion at appropriate intervals.
An embedding fitting 15 is embedded in the round hole 14.

Reference numeral 16 denotes a water collecting basin having a tapered circular hole whose diameter becomes smaller toward the lower surface provided on one side end of the right block 12b. When spring water is generated, drainage as illustrated in FIG. A pump 17 is provided to drain water. Further, after no spring water is generated or after the spring water is generated and drained, a trapezoidal water collecting basin cover plate 18 is fitted into the water collecting basin 16 and formed by the water collecting basin cover plate 18 and the peripheral side surface of the water collecting basin 16. Water expansion packing 19a
After filling with inflatable mortar 19b and waterproofing,
Furthermore, it is closed with a holding mortar 20.

Reference numeral 21 denotes an opening formed by a lower inner peripheral surface of the blade port block 1 and a peripheral portion of the bottom plate block 12. The opening 21 is formed in a wedge shape. As in the case of waterproofing, the water-expandable packing 21a is pushed in and the expansible mortar 21b is filled to perform a waterproofing treatment.

Reference numeral 22 denotes a connection fitting made of a horizontally long angle material, which connects and fixes the bottom plate block 12 and the blade block 1 to each other. As shown in FIG. 7, the connecting bracket 22 has a short one provided with ribs 22a and 22b at predetermined intervals used for a front central part, a rear central part and both side parts, and a left and right part of a front part and a left and right part of a rear part. Ribs 22a, 22b, 2 used for
There is a long one provided with 2c, which is placed on the periphery of the bottom plate block 12. However, a void 23 having no connection metal fitting 22 is formed in the square part, and the expandable mortar 21b is filled from the void 23. You. And each rib 22
a, 22b and 22c, a vertically elongated bolt insertion hole 24a in the horizontal plane 24 and a horizontally elongated bolt insertion hole 25 in the vertical plane 25.
a, 25a are respectively formed, and the insertion holes 24
The bolts 26, 27, 27 are inserted from a, 25a, 25a and screwed with the above-mentioned buried metal fittings 2, 15.

Next, the method of construction will be described with reference to FIGS. 12 to 19. In order to confirm the existence of underground pipes such as water pipes, sewage pipes, gas pipes, etc. in advance at a man-made hole, a vertical hole 28 is dug by hand. Keep it. Prior to test digging, lightweight steel sheet pile 29
Is driven around the upright hole 28 and the steel sheet pile 29
The top of is slightly deeper than the ground. The size of the test excavation hole 28 is slightly larger than the depth, length, and width of the caisson prefabricated manhole. This standing hole 2
8 is then backfilled with backfill soil (high quality soil) 30, but at that time, as described above, the upper end of the steel sheet pile 29 does not come out on the road surface, so that the time for installation and the cost of construction can be reduced.

The backfill soil 30 at the place where the backfilling was performed is excavated again to the place where the test excavation was performed, and the cutting hole block 1 is installed in the upright hole 28. The cylindrical block 4 is placed on the upper surface of the blade block 1 and the blade block 1 and the cylindrical block 4 are placed.
The bolts 5 and 6 pierced at predetermined positions on the joint surface are aligned with each other, the bolt 9 is inserted through the recess 7 and the nut 1 is inserted through the recess 8.
0 is screwed and joined integrally. (See FIG. 1).

The bottom soil is excavated with an excavator from the inside of the blade block 1 and the cylindrical block 4 integrated with each other, and is settled to a predetermined position by its own weight. Insert and roll. At this time, the blade block 1
More pressure is applied to the edge of the blade to fill up to a predetermined position. After that, sand 32 is put in and sufficiently pressed to form a horizontal surface. When spring water is generated during this operation, a submersible pump (not shown) is inserted into the inside of the tubular block to discharge the spring water to the outside.

After that, the left and right bottom plate blocks 12a and 12b divided into two parts are housed in the lower inner peripheral surface of the blade port block 1. However, since they are divided into two parts and are small, even if they are not crane trucks, they can be backhoeed. There is convenience that can cope. Since the left and right bottom plate blocks 12a, 12b are formed on the inclined surface 13 whose peripheral surface expands toward the lower surface, the gap formed between the lower inner peripheral surface of the blade port block 1 becomes a wedge-shaped opening 21, The water-swelling packing 21a is pushed into the tip of the opening 21. (See FIGS. 1 and 4).

Thereafter, the connecting fitting 22 is connected to the bottom plate block 12.
And the bolt insertion hole 24a drilled in the horizontal plane 24 of the connection fitting 22 matches a position matching the buried fitting 15 buried in the round hole 14 around the bottom plate block 12 and the lower part of the blade port block 1. Bolt insertion holes 25a, 25a drilled in the vertical surface 25 of the connection fitting 22 are aligned with positions matching the embedded fitting 2 embedded in the recess 3 on the inner peripheral surface, and the bolts 26, 27, 27 are inserted and embedded. It is screwed and fixed to the fittings 2, 2, and 15. At this time, the bolt holes 24a formed in the horizontal surface 24 are vertically long, and the bolt holes 25a, 25a formed in the vertical surface 25 are horizontally long holes. And the bolts 26, 27, 27 can be easily screwed together.

When the connection fitting 22 is fixed, the expandable mortar 21b is press-fitted from a void 23 in the square portion of the bottom plate block 12 where the connection fitting 22 is not provided, and is filled into and joined to the opening 21 formed in the periphery. .

If the spring water still appears to occur, the drain pump 17 is placed in the water collecting basin 16 and sucked through a suction port 17a formed in the lower part.
Drain spring water through c. If no spring water is generated or even a small amount of water is generated, the drainage pump 17 fitted to the water collecting basin 16 is removed, and the detachable handle portions 18a and 18a attached to the upper surface of the water collecting basin cover plate 18 are removed. The catch 18a is fitted to the catch basin 16.

As described above, since the water collecting basin cover plate 18 is formed in a trapezoidal shape, when it is inserted into the water collecting basin plate 16, a wedge-like shape is formed between the water collecting basin cover plate 18 and the inner surface of the water collecting basin 16. An opening 19 is formed, the wedge-shaped opening 19 is filled with a water-expandable packing 19a and an inflatable mortar 19b, and a waterproofing treatment is performed. I do. Thereafter, the top plate block 33 is placed on the upper surface of the cylindrical block 4 and the neck block 34 is attached, whereby the human hole is completed.

In the above-described embodiment, the description has been made of an example including the blade port block and the cylindrical block, and the example in which the bottom plate block is also divided into two. However, the present invention is limited to these embodiments. However, it is obvious that various design changes can be made without departing from the gist of the invention, without departing from the gist of the invention.

[0025]

As described above, according to the caisson prefabricated human hole of the first aspect of the present invention, the opening formed by the peripheral side of the bottom plate block and the lower inner peripheral surface of the blade block is wedge-shaped. Since the wedge-shaped opening is waterproofed, a sufficient waterproofing force can be obtained, and at the same time, the portion is fixed by holding the connecting member of the angle material. A strong reaction force is obtained on the bottom plate block with strong adhesion. In addition, the reaction force is transmitted to the lower inner peripheral surface of the blade port block by the wedge effect, thereby reducing the force applied to the connection fitting and the bolt and improving the water stopping power.

According to the caisson prefabricated manhole of the second aspect, even if the construction site is a place where loosening such as soil with a lot of pebbles is likely to occur, the loosening of the outer soil of the cutting edge is prevented and the body becomes tight. Therefore, a sufficient supporting force can be obtained.

Further, according to the caisson prefabricated human hole according to the third aspect, the bottom plate block is reduced in size, which facilitates handling during construction, and can be handled by a backhoe without using a truck crane. Charter costs can be reduced. In addition, since a drainage basin in which a drainage pump can be installed is provided, it can sufficiently cope with a spring.

According to the method for constructing a caisson prefabricated human hole according to claim 4, drainage and water stoppage can be easily performed even at a spring location, so that the installation work of the bottom plate block can be performed easily and reliably. Underground manhole of 4m, width 1.7m, height 2.4m, earth covering 2m is installed in 6 hours, can be backfilled, and the construction period is completed in one day even if preparation and cleanup are put in. It can be shortened and the construction cost can be halved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a caisson prefabricated human hole of the present invention.

FIG. 2 is a plan view taken along line AA of FIG. 1;

FIG. 3 is a vertical sectional side view of a caisson prefabricated human hole of the present invention.

FIG. 4 is an enlarged vertical sectional front view of a main part of the present invention.

FIG. 5 is an enlarged sectional view of a portion B in FIG. 1;

FIG. 6 is a plan view of a bottom plate block.

FIG. 7 is a front view of the connection fitting.

FIG. 8 is a sectional view taken along line CC of FIG. 7;

FIG. 9 is a plan view of a water collecting pot cover plate.

FIG. 10 is a front view of a water collecting pot cover plate.

FIG. 11 is a front view of a drain pump.

12 to 19 are explanatory diagrams showing construction examples.

FIG. 20 is a longitudinal sectional front view of a conventional example.

FIG. 21 is an enlarged vertical sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blade block 2, 15 Buried metal fitting 4 Cylindrical block 12 Bottom plate block 13 Inclined surface 16 Water collecting basin 17 Drain pump 21 Opening 21a Water swelling packing 21b Expandable mortar 22 Connection metal fitting 24 Horizontal plane 24a, 25a Bolt insertion hole 25 Vertical plane 26, 27, 27 bolt 28 vertical hole

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 20, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroo Oe 3-3-22 Nakanoshima, Kita-ku, Osaka City Inside Kansai Electric Power Co., Inc. (72) Inventor Katsutoshi Kimura 3-2-222, Nakanoshima, Kita-ku, Osaka Kansai Inside Electric Power Company (72) Inventor Ichiro Kobayashi 5-14-10 Nishitenma, Kita-ku, Osaka City Kinki Concrete Industry Co., Ltd. (72) Inventor Shizuhiro Nakata 5-14-10, Nishitenma, Kita-ku, Osaka Kinki Inside Concrete Industry Co., Ltd. (72) Inventor Akihiro Miyatake 5-14-10, Nishitenma, Kita-ku, Osaka-shi Inside Kinki Concrete Industry Co., Ltd. (72) Yoshihisa Thin Blade 5-14-10, Nishitenma, Kita-ku, Osaka-shi Kinki Concrete Industry Co., Ltd.

Claims (4)

[Claims] An at least one cylindrical block is mounted on an upper surface of a cylindrical blade block, and is integrally connected and fixed to the blade block. A bottom plate block having an inclined surface whose peripheral surface expands downward is connected to the blade block. And waterproofing the wedge-shaped opening formed by the periphery of the bottom plate block and the lower inner peripheral surface of the blade block, and connecting the angle bracket to the upper surface of the bottom plate block. A caisson prefabricated person that is configured to fix the bottom plate block by inserting bolts that are placed on the periphery and screwed with the buried metal fittings embedded in the bottom plate block and the blade block from the bolt insertion holes in the vertical and horizontal planes of the connection metal fittings. Hole. 2. The cutting edge block according to claim 1, wherein the cutting edge block has a cutting surface having an inclined surface inclined from inside to outside on the inner surface, and a cutting surface having an inclined surface inclined at a small angle from outside to inside on the outer surface. Caisson prefabricated manhole. 3. The caisson prefabricated structure according to claim 1, wherein the bottom plate block is divided into at least two parts, one of the bottom plate blocks is formed with a water collecting basin, and the drainage pump is fitted into the water collecting basin. Human hole. 4. An excavation hole of a predetermined size is excavated in the ground, a cylindrical cutting block is placed in the standing hole, and at least one cylindrical block is placed on the upper surface thereof to form a cutting block. They are connected and fixed together, excavate the soil at the bottom from the inside of the tubular block, sink it to a predetermined position by its own weight, level the bottom ground to a horizontal plane, and insert the bottom plate block at least divided into two. A caisson prefabricated manhole construction method characterized in that when a spring is formed, a drainage pump fitted to a water collecting basin provided on one of the bottom plate blocks discharges the spring water to perform the construction.