JP2008069557A - Underground buried structure flotation restraining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of being unable to find a measure easy in construction and sure in the effect, though requiring the measure for preventing this hindrance, since this phenomenon becomes breaking of a lifeline and a hindrance to the passing of a rescue vehicle, though the phenomenon of floating an underground buried structure such as a manhole is conventionally frequently caused by an earthquake. <P>SOLUTION: This underground buried structure flotation restraining device is composed of an anchor 1 with a blade having an upper part blocked up in a cylindrical shape by a cover plate, fixing a boring advancing excavation blade 11 to the lower end, and fixing a spiral blade 6 to the outer periphery, respectively and anchored in the depth of sufficient ground strength by rotary jacking, and a structure fixing shaft 15 having the lower end fixed to an upper part of the anchor with a blade and having an upper part connected to the underground buried structure 10 being a fixing object. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an underground structure floating suppression device, and more particularly to an apparatus that can effectively prevent a phenomenon in which an underground structure such as a manhole is lifted due to an earthquake.

  In the case of many large-scale earthquakes that occurred in the past, underground structures such as manholes and underground water tanks have risen to the surface, and there is an urgent need to destroy and rescue lifelines such as sewers and waterworks It was causing a situation that obstructed traffic.

When the ground is loose and the groundwater level is high, this underground floating structure rises to an excess pore water pressure due to an increase in pore water pressure in the ground when an earthquake occurs. It is thought to be generated by pushing up the buried structure.
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  In the past, in order to prevent this floating phenomenon, a method of injecting and solidifying cement milk at the lower and lower ends of underground structures such as manholes to obtain resistance between the ground and the soil was repeatedly used. Due to the earthquake that occurred, the cement milk aged and peeled off and eventually became unable to withstand the earthquake, which was not a sufficient measure.

  In addition, multiple excess pore water pressure dissipation valves that are not opened by hydrostatic pressure but are opened only when excess pore water pressure is applied are installed at various locations on the peripheral wall of underground structures such as manholes. Although attempts have been made to reduce the rise of pore water pressure and suppress the floating of underground structures, it has not necessarily achieved a sufficient effect and could not be said to be a fundamental solution. .

  As a result of earnestly researching measures to prevent the phenomenon of floating underground structures that hinder lifeline destruction and rescue vehicle traffic in the event of an earthquake, the present inventor effectively prevented this phenomenon at low cost. The present inventors have succeeded in developing a convenient device that can be used, and are proposed here as the present invention.

  A winged anchor that has a cylindrical shape, the upper part is closed by a lid plate, the excavating blade for excavation is fixed to the lower end, and the spiral wing is fixed to the outer periphery, and is fixed to a sufficient depth of ground strength by rotary propulsion. And a structure fixing shaft that has a lower end fixed to the upper portion of the winged anchor and an upper portion connected to the underground structure to be fixed; The above problem has been solved.

  In the underground structure floating suppression apparatus according to the present invention, the winged anchor is rotated and propelled to a support layer having sufficient ground strength, fixed there, and the underground structure such as a manhole is fixed by the structure fixing shaft. By connecting the anchor with a wing, the underground structure is firmly fixed, and it can be applied to the existing facility as well as the new facility without any soil. It effectively prevents the rise of underground structures such as manholes caused by earthquakes, secures lifelines such as water and sewage systems and passages for rescue vehicles, and minimizes the expansion of damage caused by earthquakes. It has the effect that can be.

  Underground structure from winged anchor that is propelled and rotated to the stable support layer of the ground without earth excavation, and the underground structure to be fixed and the structure fixing shaft that connects the anchor with the wing. The greatest feature is in the construction of the levitation suppression device.

  FIG. 1 is a longitudinal sectional view of an embodiment of an underground structure floating suppression apparatus according to the present invention, and FIG. 2 is a bottom view thereof.

  In the figure, reference numeral 1 denotes an anchor with a wing, which is a main component of the underground structure floating suppression apparatus according to the present invention. The anchor has a cylindrical shape, the upper opening is a cover plate 2 on a circular plate, the lower opening A pair of digging blades 11 and 11 for digging are provided at the lower end of the steel cylinder 4 whose parts are respectively closed by the cover plate 3, as shown in FIG. 2. Are fixed to the peripheral wall 5 of the cylindrical body 4 so that the spiral blade 6 is wound around the peripheral wall 5. In the figure, reference numeral 12 denotes a holding plate for keeping the excavating blade 11 at a predetermined angle. 3 and 4, the excavation blade 11 has base portions 18 fixed to the peripheral wall 5 of the cylindrical body 4 at equal intervals, and the respective blade tips 19 protrude downward. Also good. In this case, if the excavating blade 11 is spaced from the lower end of the spiral blade 6 by about 1.5 times the diameter of the cylindrical body 4 and fixed below the excavating blade 11, the rotational propulsion of the spiral blade 6 becomes smoother. Vertical propulsion is also easier.

  A pair of locking arm members 8 and 8 projecting from the upper portion of the peripheral wall 5 of the cylindrical body 4 project in the lateral direction.

  On the other hand, reference numeral 15 in the figure denotes a structure fixing shaft, which is planted upward from the center of the cover plate 2 of the winged anchor 1 by appropriate means such as screwing and welding, and the upper part thereof is shown in FIG. As shown, it is fixed to the upper peripheral wall of the underground structure 10 such as a manhole through a fixing aid 9. The length of the structure fixing shaft 15 is such that the winged anchor 1 can be positioned at a predetermined depth with sufficient ground strength.

  Next, a method of using this embodiment will be described with reference to FIGS. As shown in FIG. 6, an engagement notch portion having an inner diameter larger than the outer diameter of the cylindrical body 4 and capable of locking the locking arm member 8 formed on the upper portion of the peripheral wall 5 of the winged anchor 1 at the lower end. The rotating rod 13 having 14 is prepared, the engaging arm members 8 and 8 are engaged with the notches 14 for engagement, the winged anchor 1 and the rotating rod 13 are connected, and the rotating rod 13 is rotated by appropriate means. Then, the winged anchor 1 is fixed at that position by rotating and propelling from the ground surface near the buried structure 10 to be fixed to a predetermined depth with sufficient ground strength without draining.

  When fixing of the winged anchor 1 is completed, the engagement notch portion 14 of the rotating rod 13 and the locking arm material 8 of the winged anchor 1 are disengaged, the rotating rod 13 is pulled out, and the winged anchor 1 is implanted. The upper part of the fixed structure fixing shaft 15 is firmly fixed to the upper part of the underground structure 10 such as a manhole through the fixing auxiliary tool 9. In FIG. 6, reference numeral 20 denotes sand. If the propulsion of the winged anchor 1 is performed while the sand 20 is supplied to the inner diameter side of the rotary rod 13, the rotary rod 13 is pulled out as shown in FIG. 5. In addition, since the sand 20 is filled in the propulsion path of the rotating rod 13, excess pore water at the time of the occurrence of the earthquake is absorbed in this portion, so that the ground holding force of the winged anchor 1 becomes stronger.

  Note that the locking arm member 8 for engaging the rotating rod 13 is not only provided outside the cylindrical body 4 but also opposed to the inner side of the cylindrical body 4 as shown in FIGS. 7 and 8. The locking arm member 8 ′ may be attached across the inner peripheral walls. In this case, a rotating rod 13 ′ having an outer diameter smaller than the inner diameter of the cylindrical body 4 is disposed inside the cylindrical body 4 as shown in FIG. 9. The engaging notch 14 ′ formed at the tip of the plug is engaged with the locking arm member 8 ′, and the winged anchor 1 is driven to rotate. In this case as well, the propulsion of the winged anchor 1 may be carried out while supplying sand to the inner diameter side of the rotating rod 13 '.

  In addition to the one shown in FIGS. 1 and 2, the spiral wing 6 has a pair of semicircular wings 16 and 16 at the lower end of the cylindrical body 4 as shown in FIGS. 10, 11 and 12. As shown in FIG. 13 and FIG. 14, the surface of the spiral wing 6 may be formed with ridges 17, and the ground soil on which the winged anchor 1 is to be propelled may be rotated. What is necessary is just to select suitably according to the magnitude | size of the anchor 1 with a wing | blade, the scale of the underground structure 10, etc.

  Further, as shown in FIG. 15, the peripheral edge of the spiral blade 6 may be bent upward to form the bent piece 7. By doing so, the earth and sand resistance of the spiral blade 6 is further increased.

  As described above, this underground buried structure levitation restraint device rotates and propels the winged anchor to a sufficient support layer with sufficient ground strength, fixes it there, and embeds underground structures such as manholes by the structure fixing shaft. It can be used to firmly fix objects, and can be constructed very easily without soil removal. It can be applied to existing facilities as well as new facilities, and underground structures such as manholes associated with earthquakes. This effectively prevents the phenomenon of rising, secures lifelines such as water and sewage systems and passages for rescue vehicles, and minimizes the expansion of damage caused by earthquakes.

  It can be widely used for aquariums, manholes and other underground structures in general.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of one Example of the underground buoyant structure floating suppression apparatus which concerns on this invention. Similarly, the bottom view seen from the bottom. Similarly, the longitudinal cross-sectional view of the Example in which the excavation blade 11 is being fixed to the surrounding wall 5 of the cylindrical body 4. FIG. Similarly, the bottom view seen from the bottom. Similarly, the explanatory view which showed the state actually used for fixation of a buried structure underground. Similarly, the side view of the state which engaged the rotating rod 13 with the anchor 1 with a wing | blade. Similarly, the longitudinal cross-sectional view of the Example in which locking arm material 8 'is formed inside the cylindrical body 4. FIG. The top view of the state which looked at the Example shown in FIG. 7 from upper direction. The side view of the state which engaged the rotating rod 13 'with the anchor 1 with a wing | blade shown in FIG. FIG. 3 is a side view in which a spiral blade 6 is drawn by cutting out a part of an embodiment in which a pair of semicircular blade bodies 16 and 16 are configured. The bottom view of the state which looked at the Example shown in FIG. 10 from the downward direction. The side view which looked at the Example shown in FIG. 10 from the position displaced 90 degrees lateral direction. The longitudinal cross-sectional view of the Example by which the protruding item | line 17 is formed in the spiral blade 6. FIG. The bottom view which looked at the Example shown in FIG. 13 from the downward direction. The side view which notched and depicted a part of sectional drawing in which the bending piece 7 is formed in the periphery of the spiral blade 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor with wing | blade 2 Lid plate 3 Lid plate 4 Cylindrical body 5 Peripheral wall 6 Spiral wing 7 Folding piece 8 Locking arm material 9 Fixing auxiliary tool 10 Underground structure 11 Excavation blade 12 Holding plate 13 Rotating rod 14 Notch for engagement 15 Shaft for fixing structure 16 Semi-circular wing body 17 ridge 18 base 19 cutting edge 20 sand

Claims (7)

A winged anchor that has a cylindrical shape, the upper part is closed by a lid plate, the excavating blade for excavation is fixed to the lower end, and the spiral wing is fixed to the outer periphery, and is fixed to a sufficient depth of ground strength by rotary propulsion. A shaft for fixing a structure, the lower end of which is fixed to the upper part of the winged anchor and the upper part is connected to the underground structure to be fixed; apparatus. 2. The underground buried structure floating restraint device according to claim 1, wherein the pair of triangular excavating blades are fixed with being inclined slightly in the opposite directions from the axis of the cylindrical body. 2. The underground buried structure floating restraint device according to claim 1, wherein the base portions of the plurality of excavation blades are fixed to the peripheral wall of the cylindrical body at intervals, and each blade tip protrudes downward. 2. The underground buried structure levitating suppression device according to claim 1, wherein the underground buried object is a manhole. The underground buoyant structure levitation restraint device according to claim 1, wherein the spiral wing is constituted by a pair of semicircular wing bodies fixed to the lower end of the cylindrical body so as to cross in an X shape. 2. The underground buried structure levitating suppression apparatus according to claim 1, wherein concentric ridges are formed on the surface of the spiral wing. 2. The underground buried structure floating restraint device according to claim 1, wherein a bent piece bent upward is formed at the periphery of the spiral wing.

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