JP2015031148A - Device for both cavity volume inspection and uplift pressure removal, and method for installing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a measuring device which measures a cavity volume caused by ground subsidence below the lower surface of a top end coating concrete of an embankment, performs grout filling injection corresponding to the cavity volume, and has a performance of reinforcement and also a performance of removal of uplift pressure applied on a base surface of the embankment; and a method for installing the measuring device.SOLUTION: A device for both cavity volume inspection and uplift pressure removal includes: outer cylindrical bodies 18, 19, 20 installed in a top end coating concrete 3 of a bank body 1; cover bodies 29, 30 generally sealing upper end openings of the outer cylindrical body 18, 19, 20; settlement boards 24, 25 and check valves 27, 28 settled into the outer cylindrical bodies 18, 19, 20 following the settlement of the bank body soil 7. The cover bodies 29, 30 are blown away by compressed-air 14 generated inside the outer cylindrical body 18, 19, 20 caused by uplift pressure that an embankment 1 receives due to rise of a water level, and become detachable.

Description

  The present invention detects the cavitation phenomenon that occurs at the bottom of the top-coated concrete provided on the coast of the embankment in the field of civil engineering and the river levee body, reinforces the cavity part by grout filling, etc. It is related with the apparatus which prevents collapse of a dike, and its installation construction method by dissipating the lifting pressure which acts on a dam body base to the top end covering concrete upper part with the rise of tsunami.

  In principle, the embankment is made of soil, but the causes of the embankment collapse were water infiltration, water overflow, erosion, and base water leakage. In order to protect the dike from these factors, the surface of the dike body was covered with cast-in-place concrete or concrete secondary product blocks. Restoration work and related costs were required. In recent years, there has been a lot of torrential rain, which is said to be one phenomenon of global warming, and the sea level has risen. The recovery costs are also huge. As described above, in the past, it has been difficult to deal with ground subsidence and cavitation countermeasures in the bottom of a concrete civil engineering structure, and after repairs and damages have occurred in the structure, large repair costs have been spent each time. In other words, it was difficult to preliminarily measure how much subsidence and cavities were generated and proceeding in the ground of the structure, and the response was delayed.

  At present, when checking the embankment-covered concrete, there is a limit to the deformation confirmation that can be grasped visually. Therefore, inspections using a cavity monitoring hole, underground radar exploration, boring, batting, depth surveying, etc. are performed. Therefore, it was necessary to newly provide a cavity monitoring hole. However, this method has a large amount of preparation, implementation period, cost, and the fact that it takes a considerable amount of time to collect the results.

  For example, when observing the amount of ground subsidence under the bottom slab in large civil engineering structures (concrete and steel-concrete composite structures), excavate the ground near the structure, insert a telescopic measurement tube, and place the ground in the measurement tube. A ground subsidence measuring device that detects the position of a subsidence element with a subsidence meter that hangs from a ground and measures the depth with a measuring tape (see Patent Document 1). Drilling a vertical pile near the outside of the structure, inserting a metal tube into it and propelling it to the bottom of the structure bottom plate, inserting a micro camera into this metal tube and visually observing the image on the monitor,・ Investigation method for determining presence or absence of hollowing amount (see Patent Document 2). Insert a long member made of a non-magnetic material with flexibility to bend appropriately according to the settlement of the soft ground, and arrange electrical markers that are excited by energizing this long member at predetermined intervals. A method of measuring the amount of ground subsidence by inserting a measurement tube made of a non-magnetic material in parallel near a member, suspending a magnetic detector in the measurement tube, and measuring the magnetic field of the magnetic marker (see Patent Document 3). ). A stretchable tubular body is stretched in the gap between the outer cylinder and the inner cylinder that inscribes the outer cylinder to connect the outer cylinder and the inner cylinder, so that the movement of the inner cylinder becomes free and the land settlement measurement can be performed easily and quickly. A device that can grasp the ground subsidence and also serves as a grout injection hole (see Patent Document 4). In addition to grout holes, inspection holes that can be loaded with measuring instruments to measure ground subsidence, cavities, and groundwater levels are provided in concrete secondary products such as Xiamen, anchor pipes, underdrains, and on-site concrete structures. A ground settlement measurement method (see Patent Document 5) and the like have also been proposed. In particular, in Patent Document 4, a stretchable cylindrical body is stretched in a gap between an outer cylinder and an inner cylinder installed therein, and the outer cylinder and the inner cylinder are connected to freely move the inner cylinder. Therefore, a ground subsidence measuring and grout injection apparatus has been proposed that performs easy and quick ground subsidence measurement, appropriately grasps the ground subsidence status, and performs grouting operations quickly and accurately.

Japanese Examined Patent Publication No. 62-54924 Japanese Patent No. 3820652 Japanese Patent Publication No. 3-26729 Japanese Patent No. 3592190 JP 2010-90668 A

However, all of the above prior arts are intended for installation of concrete structures (for example, lock gates, lock pipes, sluices, etc.) and have been considered to the point that they also serve as ground subsidence measurement or grout injection holes. However, the coastal / river levee body or sloped levee body is subject to lifting pressure on the levee basement surface as the water level rises, which may eventually lead to the levee collapse, which should be eliminated. Absent.
The present invention is based on the above-mentioned conventional problems, and measures the amount of cavities due to ground subsidence on the bottom surface of the embankment covered concrete of the levee, performs grout filling injection according to the amount of the cavities, and raises the pressure applied to the levee foundation surface as well as reinforcing It is an object of the present invention to provide a measuring apparatus having a removal performance.

  For this reason, the pressure relief device for checking the cavity amount according to the present invention includes a cylinder installed in the top end covering concrete of the levee body, a lid that normally seals the upper end opening of the cylinder, and the cylinder. It is equipped with a sinking plate that sinks as the levee body sinks and a check valve, and the lid body is blown away by the compressed air generated inside the cylinder body by the lifting pressure that the levee body receives as the water level rises and can be detached It is said that it is said that it is said that it is the 1st characteristic, and the pressure removal apparatus for cavity amount inspection combined use. In addition, the installation method is to embed a ceiling plate covering concrete after embedding a circular settlement board with a lower part of the main body of the device and a detection rod in the levee body soil, and leveling the backfill material. It is characterized by. Furthermore, after laying and leveling the cracked stone, place a suction prevention sheet on the place where it has been lowered from the surface by a predetermined depth, install a cylindrical frame on it, install the main unit in the center of the same mold, A third feature is that the top end covering concrete is placed after the inside is filled with sand. Furthermore, the fourth feature is that a plurality of the above-mentioned cavity amount inspection / lifting pressure removal devices are installed at predetermined intervals on the bank body.

The present invention has the following excellent effects.
(1) By attaching and observing the apparatus of the present invention on the top-end concrete of a coastal / river embankment or a sloped embankment, early detection and countermeasures against the cavitation phenomenon are possible. Moreover, by dissipating the lifting pressure generated on the levee basement surface as the water level rises, collapse of the levee body can be prevented in advance.
(2) It is possible to easily observe the cavities due to the settlement of the bottom surface of the embankment-top covered concrete whenever necessary.
(3) In addition to fixed-point observation, in the event of storms and floods, earthquakes, tsunamis, storm surges, etc., fluctuations can be measured immediately after the end of the situation, and restoration according to the disaster situation can be performed quickly and accurately.
(4) The grout filling operation can be performed through the cylinder.

It is sectional drawing which shows typically the state which installed the amount-of-cavity inspection combined use lift removal apparatus which concerns on this invention in a dike (tide levee, a high tide lantern), and an inclined levee. It is an expanded sectional view which shows the state which installed the amount-of-cavity inspection and lift removal apparatus which concerns on this invention. It is sectional drawing which shows typically the operation state of the cavity amount inspection combined use lift removal apparatus which concerns on this invention. FIG. 2 is a structural diagram of a lift removal apparatus for use in both inspection and cavity volume according to the present invention. FIG. 3 is a structural diagram showing an example of a lid body and a check valve device of the lift amount removing apparatus for cavity amount inspection according to the present invention. It is structural drawing which shows the other example of the cover body and check valve apparatus of the cavity amount check combined use lift removal apparatus which concerns on this invention.

In the following, an embodiment in which the apparatus for removing lift for combined use of cavities according to the present invention is installed on a levee (sea tide embankment / high tide embankment) 1 and an inclined embankment 2 will be described with reference to the drawings. The same reference numerals are used for explanation.
The lift amount removal devices 15, 16, and 17 that are used for the inspection of the cavity amount are normally fitted with lids 29 and 30 at the upper ends of the cylinders 18, 19, and 20, so that the levee management vehicle / person can pass smoothly, When checking the amount of cavities and injecting the cloud, remove the lids 29 and 30. When the lifting pressure is generated, the pressure inside the levee body rises, and the lids 29 and 30 attached to the upper end of the device are blown off to dissipate the internal pressure. Have been to.

  FIG. 1 is a cross-sectional view showing a state in which cavities inspection and lift removal devices (hereinafter simply referred to as the same device) 15, 16, and 17 according to the present invention are installed on the levee 1 and the inclined levee 2, The lower layer of the top end covering concrete 3 is configured such that the backfill material 4 is spread on the upper layer of the dam body soil 7 and leveled. The lower part of the device 15 is embedded and installed in the dam body soil 7. Reference numeral 15 denotes an apparatus in which a circular settlement plate 24 with a detection body 26 is attached to the apparatus. Reference numerals 16 and 17 are apparatuses in which a square sinking plate 25 is attached to the apparatus.

  As for the inclined bank 2, as shown in FIG. 1 (B) and FIG. 1 (C), the configuration of the lower layer of the top cover concrete 3 is the case where the discarded concrete 6 is cast, and the case where the discarded concrete 6 is cast. May not have been. In the figure, the left half of the center line L indicated by the one-dot chain line shows the case where the walnut stone 5 and the backfill material 4 are laid, and the right half shows the case where the discarded concrete 6 and the backfill material 4 are laid. The circular settlement plate 24 at the lower end of the device 15 is embedded in the dam body soil 7, and the rectangular settlement plate 25 at the lower ends of the devices 16, 17 is embedded in the cracked stone 5 and placed on the surface of the backfill material 4. The main material of the device is made of stainless steel, steel and hard vinyl chloride, and the steel part is galvanized to enhance the rust prevention effect.

FIG. 2 is an enlarged cross-sectional view in which the devices 15, 16, and 17 are installed. As shown in FIG. 2A, the device 15 is installed in the bank main body soil 7 as an installation unit. After embedding a circular settlement plate 24 to which the lower part of the main body and the detection rod 26 are attached and spreading the backfill material 4, the top covering concrete 3 is placed. As shown in FIG. 2 (b-1) and FIG. 2 (c-1), in the devices 16 and 17, the left side is laid with a walnut stone 5 and then lowered by a predetermined depth (several centimeters) from the surface. The anti-suction sheet 9 is laid, the cylindrical frame 10 is installed thereon, the devices 16 and 17 are installed in the center of the mold, and the sand 11 is filled inside the mold, and then the top-coated concrete. 3 is cast.
In FIG. 2 (b-2) and FIG. 2 (c-2), after the backfilling material 4 is spread and leveled, the suction prevention sheet 9 is spread on the surface thereof. The cylindrical frame 10 is installed thereon, the apparatuses 16 and 17 are installed at the center of the mold, and then the top end concrete 3 is placed after the sand 11 is filled inside the mold.

  The devices 15, 16, and 17 installed in the procedure of FIG. 2 exhibit movements as shown in FIG. 3. The sinking plate 24 responds and begins to descend. Further, as shown in FIG. 1, the water level 8 rises and a lifting pressure 13 is generated in the dam body. The generated lifting pressure 13 rises and passes through the inner tube 21 of the subsidence measuring device attached to the circular subsidence plate 24, becomes compressed air 14, pushes up the check valve device 27, and the cover body with the momentum 29 is blown off. The lid body 29 that has been blown off is connected by a connecting chain 31 so as not to be lost. The devices 16 and 17 are operated in the same manner as the device 15 in the case where the descending operation occurs following the ground subsidence and the lifting pressure phenomenon occurs.

  As shown in FIG. 4, the apparatus 15 is provided with a subsidence measuring inner tube 21 in a device outer tube 18 and a circular subsidence plate 24 having a detection rod 26 attached to the lower end thereof. In measuring the amount of the cavity, the lid 29 at the upper end of the device outer tube 18 is removed, the release handle 32 of the check valve device 27 attached inside the device outer tube 18 is opened, a ruler is inserted, and the sinking device is inserted. The upper end of the measurement inner tube 21 is reached, and the amount of cavity is measured at the upper end of the apparatus 15.

  The lift pressure 13 passes through the inside of the subsidence device inspection inner tube 21, and the compressed air 14 pushes up the check valve device 27, and the lid body 29 is blown away by that force to dissipate the pressure. The skipped lid 29 is connected with a connecting chain 31 so as not to be lost. In addition, since the embankment management vehicle passes through the top surface of the top-end covering concrete 3 and a wheel load may be applied to the lid 29, the load bearing performance structure is adopted.

  The grout filling / injecting operation into the cavity can be performed by removing the lid 29 and performing the filling / injecting operation. A fixing bracket 33 is attached to the upper part of the outer cylinder pipes 18 and 19 of the apparatus, and is fastened to other support brackets so as not to move after completion of the apparatus installation. A circular rubber packing 34 is attached so that the apparatus 15 does not flood from the contact surface between the lower end of the apparatus outer tube 21 and the circular hole sinking plate 26 after the installation is completed.

  The device 16 has the same structure as 15, has a square squat plate 25 attached, and no detection rod 26 is attached. The lifting pressure 13 passes through the inside of the subsidence measuring instrument inner tube 22 and is dissipated on the top surface of the ceiling-covered concrete 3. The apparatus 17 has the same structure as that of 15, except that a square squat plate 25 is attached and no detection rod 26 is attached. A sinking measurement rod 23 is attached to the inside of the device outer tube 20 and fixed to a rectangular sinking plate 25. The square settlement plate 25 is provided with several lifting pressure release holes 37 so that the lifting pressure 13 easily stays in the outer cylinder tube 20 of the apparatus, and the contact surface between the apparatus outer cylinder tube 20 and the rectangular settlement plate 25. Is attached with a square rubber packing 35 for preventing water immersion.

  FIG. 5 is a structural diagram of the lid 29 and the check valve device 27 of the apparatus. The lid 29 blown off by the connecting chain 31 is tied to the devices 15 and 16 so as not to be lost. Since there is a possibility that the vehicle may pass over the lid 29, a load-bearing structure is provided, and a shock-absorbing rubber packing 40 is mounted when rainwater inundation prevention and wheel load are mounted. The check valve device 27 has a structure in which the elastic rubber plate 38 is fixed to the fixed plate 39 with screws 41 so that the compressed air 14 is easily removed, so that the check valve device 27 does not deform or move. FIG. 6 is a structural diagram of the lid body 30 and the check valve device 28 of the device 17, and is connected to the device 17 so as not to be blown off by the connecting chain 31 and lost. Since there exists a possibility that a vehicle may pass on the cover body 30, it is set as the load bearing structure.

1 dike
2 Inclined levee 3 Top cover concrete 4 Backing material 5 Split chestnut 6 Discrete concrete 7 Dike body soil 8 Water level 9 Suction prevention sheet 10 Cylindrical frame 11 Sand 12 Settling 13 Compressed air 15 Stainless steel hollow with detection rod Inspection and pressure relief device 16 Steel cavity amount inspection and pressure relief device 17 Hard vinyl chloride cavity amount inspection and pressure relief device 18 Equipment outer tube (stainless steel)
19 Equipment outer tube (steel galvanized)
20 Device outer tube (made of hard vinyl chloride)
21 Sinking device inspection inner tube (made of stainless steel)
22 Subsidence device inspection inner tube (steel galvanized)
23 Subsidence device inspection rod (steel galvanized)
24 circular sink plate 25 square sink plate 26 detection rod 27 check valve device 28 check valve device 29 for hard vinyl chloride device lid 30 hard cover device lid 31 for hard vinyl chloride connection chain 32 release handle 33 device body fixing bracket 34 Round rubber packing 35 Square rubber packing 36 Drain hole 37 Lifting pressure release hole 38 Elastic rubber plate 39 Fixing plate 40 Buffer rubber packing 41 Screw

Claims (4)

  A cylinder installed in the top-end concrete of an embankment or sloped bank, a lid that normally seals the upper end opening of the cylinder, and a subsidence plate that sinks with the subsidence of the levee soil in the cylinder A check valve, and the lid body is blown away by compressed air generated in the cylindrical body by a lifting pressure received by the bank due to a rise in the water level, and can be removed. Pressure relief device.   2. A cavity according to claim 1, wherein a circular settlement board with a lower part of the main body of the apparatus and a detection rod is embedded in the dam body soil, and a back cover material is spread and leveled, and then the top end covering concrete is placed. Installation method of pressure relief device for quantity inspection.   After laying and leveling the walnut stone, place the anti-suction sheet on the place where the depth is lowered from the surface, install a cylindrical frame on it, install the main body in the center of the same mold, and place it inside the mold 2. The method of installing a cavity pressure checking and pressure removing device according to claim 1, wherein the top end-covered concrete is cast after filling with sand.   4. The method for installing a cavity amount checking / combining pressure relief device according to claim 2, wherein a plurality of the cavity amount inspection / lifting pressure removing devices are installed on the bank body at predetermined intervals.

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