JP2007224596A - Method of seismically reinforcing conduit embedded in cut and covered groove, and method of reinforcing interval between manhole and conduit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new method of seismically reinforcing a conduit inclusive of a manhole, laid in backfilled soil in a cut and covered groove for preventing the breakage and tilting fluctuation of the conduit caused by liquefaction caused by the rocking of the backfilled soil during a tremor of an earthquake or the like, and to provide a new method of reinforcing an area around the manhole. <P>SOLUTION: The method of seismically reinforcing the conduit embedded in the cut and covered groove is characterized in that, a hardener solution such as cement milk is injected into the backfilled soil on an existing or newly constructed conduit for the individual or shared use of water works/sewage work, electricity, telephone, in the cut and covered groove under the ground surface by strong injection pressure, and after hardening the hardener solution, rod-like or plate-like reinforcing bands that extend from the embedded soil and are deeply engaged with the natural ground on both sides of the same are arranged in a single or a plurality of upper and lower layers. Thus a boundary between the backfilled soil and the natural ground on each side is reinforced, and liquefaction inclusive of the separation of the backfilled soil is prevented, to thereby prevent the breakage etc. of the conduit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seismic reinforcement method for a pipe culvert embedded in a cut groove below the ground surface and a reinforcement method around a manhole, in particular, in a pipe tract including a manhole laid in the backfill soil in the cut groove. It is related to a seismic reinforcement method and a reinforcement method around a manhole that prevent the backfill soil from being broken and liquefied by shaking due to the vibration caused by the vibration of the pipe to prevent the pipe to be damaged or tilted. .

  There exists patent 3340147 gazette as this kind of technique. This publication describes that pressure water around a manhole laid under the ground surface is guided into the manhole to prevent the manhole from rising due to a liquefaction phenomenon.

Japanese Patent No. 3550392 and Japanese Patent Application Laid-Open No. 2004-316397 describe that a hardener liquid is injected at a high pressure into the ground with an injection pipe to strengthen the soil ground and the like.
Japanese Patent No. 3340147 Japanese Patent No. 3550392 Japanese Patent Application Laid-Open No. 2004-316397

  However, in the above technology, liquefaction of the backfill soil in the excavated trench, especially slip due to skin separation between the grounds on both sides, liquefaction due to vibration, damage to the pipe culvert caused by this slip, liquefaction, etc. There is a problem that there is a lack of description to prevent. There is no such consideration at present, as the backfill soil on the pipe lane should be strengthened in a consistent manner with natural grounds that have long-lasting natural hardness. Therefore, the backfilling soil easily resonates with earthquakes and other vibrations, divides from the natural ground, shakes and liquefies, and swayes the pipes up and down and left and right to cause division and the like. In addition, there is a problem that much time and cost are required to reinforce the conventional pipe lanes while blocking traffic on the pipe lanes.

  The present invention has a high injection pressure with an injection pipe inserted from the ground surface into backfill soil on individual or joint pipes for water and sewerage, electricity, telephone, etc. existing and newly installed in the excavation groove below the surface. Inject a hardener solution such as cement milk, wait for its solidification, and provide reinforcing strips such as rods and plates that deeply penetrate into the ground on both sides from the backfill soil in one or more layers above and below. In order to prevent the liquefaction of the backfill soil due to vibration such as an earthquake and the like by reinforcing the backfill soil including the boundary with It was made to solve.

  In the present invention, the excavated backfill soil straddles between the ground rocks on both sides by deeply digging into the ground rocks on both sides and injecting a hardener solution such as cement milk at a high pressure. Since a reinforcing band such as a bar or flat plate is formed and is reinforced by this reinforcing band, the backfill soil layer is eliminated from the natural ground and the backfill layer is also strengthened. Therefore, it will not be liquefied, and damage to the pipe canal can be prevented. In addition, since the conventional reinforcement work by blocking traffic is not necessary, the time for the reinforcement work can be greatly shortened, and the reinforcement cost can be reduced.

  High-pressure injection of hardener and solidification of the parts that are prone to water leakage, such as the connection between the manhole and pipe, prevents the formation of cavities due to water leakage, and easily fills with fillers when cavities occur This produces the effect that it can be backfilled.

  There is an effect that it can be strengthened by high-pressure injection of the hardener liquid in the backfill soil on the outer surface of the side hole of the manhole and under the bottom plate of the manhole.

The present invention provides 200 to 1000 kgf / cm ² by injection pipe from the surface to the backfill soil on individual or joint pipes for water and sewerage, electricity, telephone, etc., existing and newly installed in the excavation groove below the surface. Injecting a hardener solution such as cement milk with an ultra-high spray pressure that reaches a maximum, and then injecting it at different angles and deeply digging into the ground on both sides of the backfill soil. 1 and multiple layers of reinforcing bands, such as slabs and rods, are provided in the upper and lower layers, and the backfill soil is reinforced including the boundary between the grounds on both sides, and the burial with damage to the pipe culvert caused by earthquakes and other vibrations In order to prevent liquefaction of the return soil and to strengthen the part of the manhole that is prone to partial damage and water leakage by high-pressure injection of a hardener solution such as cement milk, so that the connection part is not damaged and water leakage does not occur. Even if it happens It can be easily backfilled.
The ground below the bottom plate of the manhole is also reinforced by high-pressure injection of a hardener solution.

  The embodiment will be described below using a sewer pipe laying between manholes. FIG. 1 is a plan view of a pipe dredging path 1, and the pipe dredging path 1 is laid in a shape connecting the manholes 3 at the bottom of an excavation groove 2 a dug down from the ground surface 2 to form a water channel. The pipe culvert 1 is provided with a large number of water collecting basins 5 near the branch pipe 4 and the ground surface. 6 is the backfill soil for the cut groove 2a, and 7 is the ground on both sides.

As shown in FIG. 2 from the ground surface 2, an injection pipe 8 is vertically placed in the backfill soil 6 on the pipe culvert 1 in the cut groove 2a, and the backfill soil 6 and the ground 7 are injected from the injection port 8a on the lower side surface. The cement milk or the asphalt hardener solution 9 is injected with a strong spray pressure toward the surface, specifically, an ultrahigh pressure spray pressure reaching 200 to 1000 kgf / cm ² . When the excavated backfill soil is wide and large, it is injected at a maximum pressure around 1000 kgf / cm ² . If the cement milk 9 or the like penetrates the backfilling soil 6 and penetrates 2m to 3m away and the width of the cut groove 2a is 3m, 1m to 2m will bite into the ground 7 on both sides. Next, the injection pipe 8 is rotated to change the angle of the injection port 8a, and the high pressure injection of injection cement milk or the like is sequentially repeated to form a radial rod-shaped skeleton, and the curing agent liquid 9 is filled so as to fill the space between the skeletons. Is solidified to form a reinforcing band 9a having a flat plate shape such as a circular shape or a rectangular shape in plan view. By first forming a strong radial rod-like skeleton, the injection pressure between the skeletons can be reduced somewhat, facilitating the work, and reducing the burden on the apparatus.

  As shown in FIGS. 3 and 4, the solidified reinforcing band 9 a is half-lengthed into the ground mountain 7 on both sides to strengthen the boundary between the ground and eliminate the risk of skin separation. In addition, since the backfilling soil 6 is pressed and reinforced, the backfilling soil 6 is prevented from liquefying without moving with the grounds on both sides even if vibration is caused by an earthquake or the like. Thus, the pipe culvert 1 in the backfill soil 6 is free from accidents such as rising and subsidence, inclination fluctuation, and breakage.

  In some cases, the injection pipe 8 is pulled out and moved to form a reinforcing band 9a in a wide area on the pipe dredging path 1. As shown in FIG. A fan-shaped reinforcing band 9 a that crosses the inside 6 and reaches the other natural ground 7 may be continuously formed. Further, as shown in FIG. 6, each reinforcing band 9a can be formed of a plurality of layers such as two upper and lower layers, and as shown in FIG. 7, the reinforcing band 9a is formed in the backfill soil 6 in a presser lid state. There is also.

  FIG. 8 shows an embodiment of a method for reinforcing a natural ground under the bottom slab of the manhole 3. The hardener liquid 9 is injected from the surface 2 into the natural ground 7 under the bottom slab to reinforce the natural ground 7 under the bottom slab. To do. This reinforcement prevents the manhole 3 from being lifted and levitated. Further, the cavity 10 or the like due to water leakage does not occur. Even when it occurs, the reinforcing band 9a is formed below as shown in FIG. 9 and the ground is strengthened, so that the filler can be easily and appropriately filled and backfilled. As shown in FIG. 10, the reinforcing band 9a may be formed by forming a vertical wall 9b, 9c on both sides to form a lower support shape having a U-shaped section view and a cover shape having the opposite shape. In addition, as shown in FIG. 11, a reinforcing band 9a may be formed over the entire length of the natural ground where there is a risk of water spillage below the pipe lane 1.

  FIG. 12 shows an example of reinforcement for preventing liquefaction by forming a rod-shaped reinforcing band 9d by high-pressure injection of a hardener liquid so as to dig deeply into the natural ground 7 at the four corners outside the side trunk of the manhole 3. It is.

  FIG. 13 shows another example of the shape of the reinforcing band, and the reinforcing band is formed by a single shape or a combination of these shapes according to the field situation.

  The present invention includes the surroundings of manholes on the existing and newly installed water and sewerage, electricity, telephone and other individual or joint pipes in the excavated trenches below the surface of the earth. It can be widely used as a method of preventing damage due to liquefaction and water leakage.

Top view showing an example of laying pipe pipes for sewerage Partially enlarged front view showing a state in which a flat reinforcing band is formed by injecting a hardener liquid from an injection pipe and deeply digging into the ground on both sides from the backfilling soil. Same side view Same overall plan view showing various examples of reinforcing band formation Partial plan view showing a reinforcing band in which a fan shape is continuously formed so as to cross the backfill soil on the pipe tract from one ground. Front view of an example in which pipe reinforcement bands are formed in two layers Side view showing an example of a reinforcing band formed in the backfill soil in the form of a presser lid Front view showing an example in which a reinforcing band is formed below the portion where water leakage between the manhole side hole and the pipe is easy to leak Front view showing the state of filling backfill when a cavity is created Front view showing an example of forming a lower support type reinforcing band having a U-shaped section view Front view showing an example in which a reinforcing band is formed under the entire length of the pipe lane Plan view showing an example in which rod-shaped reinforcement bands are formed at the four corners of the backfill soil outside the manhole (A) thru | or (h) is a figure which shows the example of formation of the reinforcement band of another shape

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 is pipe dredging path 2 is ground surface 2a is excavation groove 3 is manhole 4 is branch pipe 5 is water collecting tank 6 is backfilling soil 7 is ground pile 8 is injection pipe 8a is injection port 9 is hardening agent liquid 9a is reinforcement belt 9b 9c is a vertical wall-shaped reinforcing band 9d is a bar-shaped reinforcing band

Claims (3)

  A hardener solution such as cement milk is injected into the backfill soil on existing or newly installed water and sewerage, electricity, telephone and other individual or joint pipes in the underground excavation groove from the surface. Reinforcement strips such as rods, flat plates, and fan shapes that inject into high pressure and wait for its solidification to dip deeply into the ground on both sides from the backfill soil are provided in one or more layers above and below. An underground culvert embedded in a cut groove characterized by reinforcing the backfill soil layer including a boundary surface to prevent skin separation of the backfill soil and breakage of the pipe channel due to liquefaction Seismic reinforcement method for roads.   2. The seismic reinforcement method for a pipe culvert embedded in a cut groove according to claim 1, wherein a hardener solution is injected into the backfill soil on the outer surface of the side wall of the manhole and the ground part below the bottom slab by high-pressure injection.   Reinforcement method between the manhole and pipe reinforced by injecting a hardener liquid into the part where the water is easily leaked between the side hole of the manhole and the pipe reinforced.

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