JP4359928B2 - Construction method of columnar seismic isolation wall - Google Patents

Description

  The present invention cuts off or reduces vibrations generated from various vibration sources such as trains, automobiles, factories, construction machines, etc., and surrounding structures and living people, etc. The present invention relates to a method for constructing a columnar underground vibration barrier for constructing a vibration barrier that suppresses the influence on the road.

  In general, vibrations generated from various sources of vibration propagate through the ground, promote deterioration and fatigue of surrounding houses, etc., and give residents discomfort and physical and mental pain. There is a problem. For this reason, various methods for blocking and reducing vibration in the vibration propagation path have been developed.

  This type of conventional method involves digging a groove from the ground surface at a position where vibrations propagating in the ground are to be cut off, leaving the inside empty to prevent vibration propagation, As a material that absorbs vibration, there is a method of filling a lightweight material such as polystyrene foam or waste rubber chip.

However, it is necessary to fill the empty groove eventually, and it can be used for the temporary anti-vibration structure, but is not suitable for the permanent anti-vibration structure. In addition, in the construction method that fills lightweight materials, lightweight polystyrene foam and the like are lifted by the buoyancy action of groundwater, while rubber chips lack strength to support earth pressure in the ground, causing loosening and settlement of surrounding ground There are problems such as.

In view of such problems, as a conventional method that satisfies transportability, workability, stability of the ground after construction, etc., a relatively strong synthetic resin wire is entangled in a string shape, and the contact portion between the wires is By using a three-dimensional void structure with a porosity of 90% or more by integrating in a fused state, the outer periphery is covered with a filter made of a non-woven fabric that has water permeability but can block permeation of earth and sand. There is a construction method that fills a trench excavated from the ground surface to form an underground vibration barrier (for example, Patent Document 1).
JP 2001-317074 A

  In the conventional technique described above, a retaining wall and a supporting work for preventing the collapse of the side sediment when constructing the groove are necessary, and the construction cost is high and the construction is difficult in a narrow space. In addition, since the three-dimensional void structure is embedded in the groove, the elastic deformation rate as a whole increases, and the elastic modulus must be increased in consideration of the stability of the surrounding ground, and the vibration-proof performance is reduced. There was a problem.

  In view of such a conventional problem, the present invention can be easily constructed even in a narrow space, and can be constructed safely and economically with an underground anti-vibration wall having high anti-vibration performance. It was made for the purpose of providing a construction method.

In order to solve the conventional problems as described above and achieve the intended object, the feature of the invention described in claim 1 is that a cylindrical cylindrical void structure whose outer periphery is covered with a non-woven fabric having water permeability. A column-type underground that forms underground vibration-proof walls consisting of column rows by installing a large number of underground void structure columns that are formed by burying them vertically in the ground. A method for constructing a vibration isolating wall, wherein the earth and sand in the sheath tube is discharged while the sheath tube is inserted into the ground, and the pipe for filling the backfill material is passed through the cylindrical tubular void structure. A cylindrical void structure is inserted into the sheath tube, and then the slurry is passed through the pipe and below the lower end of the cylindrical void structure while pulling up the sheath tube with the cylindrical void structure remaining in the ground. by injecting Jo of backfill material, back filled on the outer periphery of the cylindrical void structure In tubular elements formula underground explosion isolating wall construction method of comprising the said filling the timber.

  The feature of the invention of claim 2 is that, in addition to the structure of claim 1, the cylindrical void structure is formed in a state in which a high elastic modulus synthetic resin wire is entangled in a string shape, and the contact of each wire The object is to use a part that is formed in a cylindrical shape by integrating the parts to have a porosity of 80% or more and having a through hole in the center.

  A feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the underground vibration isolation wall is formed by burying underground void structure columns in a staggered arrangement.

  According to a fourth aspect of the invention, in addition to the configuration of the first, second, or third aspect, the invention has a flat base portion that is in contact with the tip of the cylindrical gap structure, and is embedded in the base portion. A tip closing member having a pipe fitting hole into which a tip of a pipe for returning material injection is fitted, and a lateral backfilling material outlet through which a tip of the pipe fitted into the through hole communicates with a side surface; The cylindrical gap structure is used in a state where the upper surface of the base portion of the tip closing member is brought into contact with the lower end of the cylindrical gap structure and the lower end of the pipe for injecting the backfill material is fitted into the pipe fitting hole. Is to be inserted into the sheath tube.

  The feature of the invention described in claim 5 is that, in addition to the structure of claims 1 to 3 or 4, the lower end side outer periphery of the backfilling material injection pipe is directed downward with respect to the inner surface of the cylindrical void structure. The locking claw member to be stopped is fixed, and the locking claw member allows the pipe to be engaged with the cylindrical gap structure so that the pipe can be moved in the drawing direction but cannot be moved in the pushing direction. It is in.

  The present invention provides an underground void structure column formed by embedding a cylindrical tubular void structure whose outer periphery is covered with a non-woven fabric having water permeability as in claim 1 in a vertical direction in the ground. By installing a large number of horizontal vibration-isolating walls in the horizontal direction to form underground vibration-proof walls made up of columnar columns, vibrations that reach this underground void structure column are absorbed here, making the columnar columnar Most vibrations can be absorbed by disposing in the above.

  In addition, the underground void structure column, while inserting the sheath tube into the ground, discharges the earth and sand in the sheath tube, passes the pipe for filling backfill material into the cylindrical tubular void structure, and the tubular shape A void structure is inserted into the sheath tube, and then backfilled to the outer periphery of the tubular void structure through the pipe while pulling up the sheath tube with the tubular void structure remaining in the ground. By constructing it by filling it, it does not require a trench, unlike the conventional case, can be easily constructed with little labor, without the need for earth retaining work, and at the same time withdrawing the sheath tube, Therefore, it can be safely constructed without impairing the stability of the surrounding ground.

  As in claim 2, the cylindrical void structure is formed in a state in which a high elastic modulus synthetic resin wire is entangled in a string shape, and the contact portion of each wire is integrated to make the porosity 80% or more. In addition, by using a cylindrical shape having a through-hole at the center, vibration absorption efficiency is high, deformation with time is small, and stability of the surrounding ground after construction is not impaired. In addition, since it has a large porosity of 80% or more, and is a lightweight body having a through hole in the center and a high compression elastic modulus, it functions as a shock absorbing material that absorbs vibration and has high vibration isolation. An anti-vibration wall forming method is provided that has an effect and does not cause a rise or volume reduction due to underground water pressure or earth pressure.

  Furthermore, since the cylindrical void structure used is flexible in the extension direction, it can be easily handled even in confined spaces and places with limited heads, which is advantageous in construction and filled with backfill material because it is cylindrical. Pipes can be routed through the through-hole in the center, and the clearance between the inner surface of the sheath tube and the cylindrical gap structure can be reduced, so that a larger diameter cylindrical shape can be obtained even with the same sheath tube inner diameter. A void structure can be inserted, and a vibration-proof wall having a higher vibration-proof effect can be obtained.

  Furthermore, as in claim 3, by forming underground vibration isolation walls by embedding underground void structure pillars in a staggered arrangement, the gaps in the void structures in each region are sufficiently spaced for each construction. Even when installed, it can be installed in an arrangement that blocks most of the vibration that propagates in the horizontal direction. In addition, it is possible to arbitrarily construct the number of arrangements that can be adapted to the vibration and the characteristics of the ground and obtain a target vibration reduction effect.

  Furthermore, as in claim 4, a pipe fitting having a flat plate-like base portion that comes into contact with the tip of the cylindrical gap structure, and the tip of the backfill material injection pipe is fitted to the base portion The backfilling material injection pipe is clogged with earth and sand by using a tip closing member that has a hole and a lateral backfilling material outlet port that communicates with the end of the pipe fitted into the through hole on the side surface. Smooth backfilling is possible without causing damage.

  Furthermore, as in claim 5, a locking claw member that is locked downward with respect to the inner surface of the cylindrical gap structure is fixed to the outer periphery of the lower end portion side of the pipe for injecting the backfill material, The pipe allows the pipe to move in the pulling direction with respect to the cylindrical gap structure and is immovably engaged in the push-in direction. The work can be done while preventing the body from being lifted by the pipe.

  Next, embodiments of the present invention will be described based on examples shown in the drawings. In the figure, reference numeral 1 denotes a vibration source, which shows a railway as an example. Reference numeral 2 denotes a house that is affected by vibrations propagated from the vibration source 1 through the ground. Between this vibration source 1 and the house 2, the columnar underground vibration barrier 3 is constructed by the method according to the present invention.

  The columnar underground vibration-damping wall 3 is formed by forming a large number of underground void-structured columns 4, 4... Having a columnar shape for vibration isolation in the ground at predetermined intervals. As shown in FIG. 2, it is arranged in a three-row arrangement so that the whole is arranged in a staggered manner between each row.

  In order to enhance the vibration blocking effect, it is necessary that the specific gravity of the apparent underground wall body including all the arranged columns is sufficiently small with respect to the surrounding ground. Therefore, the distance between rows and the distance a between the underground void structure columns in each row are, in principle, smaller than the diameter D of each underground void structure column as shown in FIG. Also, determine the target vibration reduction level.

  In addition to the above-described three-row arrangement, two or four or more staggered arrangements may be used, although not shown in the figure. Further, in addition to the staggered arrangement, a plurality of rows of grids may be arranged as shown in FIG.

  Next, the structure of the interstitial void structure column 4 in each place and the construction method thereof will be described. FIG. 4 shows the underground void structure column 4 constructed according to the present invention, and reference numeral 10 in the figure denotes excavation excavated from the ground surface. A hole, 11 is a cylindrical void structure, 12 is a filter made of a water-permeable nonwoven fabric covering the outer periphery of the cylindrical void structure 11, and 13 is a backfill material.

  The cylindrical void structure 11 is a string-like three-dimensional solid body having a high void ratio of 80% or more, in which plastic linear materials having a high elastic modulus are entangled in a random arrangement and their contact portions are fused and integrated. It is a net-like body, which is formed in a cylindrical shape having a through hole 14 in the central portion. The filter 12 is made of a synthetic resin nonwoven fabric that allows water to pass therethrough but does not allow earth and sand to pass therethrough, and covers the entire outer periphery of the cylindrical void structure 11.

  A pipe lead-out member 15 is fixed to the lower end of the cylindrical gap structure 11. This is necessary when the underground void structure column 4 described later is formed. Further, an upper end closing tool 16 is fitted on the upper end of the cylindrical gap structure 11, and the upper side thereof is filled with backfill soil 17.

  In the underground void structure pillar 4, a backfilling material injection pipe 20 used at the time of creation described later is left. The pipe 20 has a steel pipe portion 20a having a predetermined length at a lower end portion, and a synthetic resin hose portion 20b is connected to and connected to the upper end thereof. The tip of the steel pipe portion 20a penetrates the filter 12 and protrudes downward, and is fitted to the pipe lead-out member 15 described above.

  This pipe lead-out member 15 has a flat plate-like base portion 15a that is in contact with the lower end of the cylindrical gap structure 11, and a steel pipe portion 20a is fixed to the base portion 15a so as to penetrate therethrough. A spacer member 15b having a U-shaped cross section is fixed upward on the lower surface of the portion 15a, the U-shaped interior serves as a backfill material lead-out path 15c, and both ends thereof are open on both side surfaces of the pipe lead-out member 15. It is a backfill material outlet. The lower end of the steel pipe portion 20a is opened at an intermediate height position in the center of the lead-out path 15c.

  A locking claw member 22 is fixed to the outer periphery of the steel pipe portion 20a. This latching claw member 22 is configured with an elastic plate material, and the tip 22a protrudes outward and downward, and this is elastically engaged with the inner peripheral surface of the cylindrical void structure 11, whereby the cylindrical void structure 11 is The steel pipe portion 20a is relatively moved downward in FIG. 4 but cannot be moved upward.

  Next, the construction work of the underground void structure column 4 configured as described above will be described. The drilling machine 30 shown in FIG. 5 is used. As shown in FIG. 5 (a), the hole drilling machine 30 pushes a sheath pipe 32 made of a cylindrical steel pipe into the ground along a vertically oriented leader 31, and pushes the inner earth and sand by water. Do. That is, although not shown in detail in the figure, the water injection hose is lowered together with the sheath pipe 32, and the sheath pipe 32 is pushed to excavate the earth and sand entering the inside by a jet water flow. As the water for excavation, the raised excavation water is stored in a water tank, and the mud soil settled and separated is circulated and used.

  After excavating to a desired depth in this way, the turbid water in the sheath tube 32 is replaced with fresh water with the sheath tube 32 left in the excavation hole 10, and then, as shown in FIG. The cylindrical void structure 11 is inserted into the sheath tube 32. At this time, the cylindrical void structure 11 is previously covered with the filter 12 and the backfilling material injection pipe 20 and the pipe outlet member 15 are set and inserted into the sheath tube 32, thereby the cylindrical void structure. The penetration of fresh water into the structure 11 is confirmed.

  Next, as shown in FIGS. 5 (a) and 6 (b), the sheath tube 32 is pulled out with the cylindrical void structure 11 left in the excavation hole 10, and the backfill material injection pipe is parallel to the pulling operation. A backfill material 13 is injected through 20. As the backfill material to be used, cement bentonite slurry is used which is mixed with cement and bentonite and hydrated into slurry. This backfilling material 13 is solidified by the hydration reaction of cement, and becomes the outer periphery covering of the underground void structure column 4.

It is sectional drawing which shows the column line type underground vibration proof wall installed by this invention. It is a top view which shows an example of arrangement | positioning of the underground space | gap structure pillar which comprises the column-column type underground vibration-proof wall shown in FIG. It is a top view which shows the other example of arrangement | positioning same as the above. It is a longitudinal cross-sectional view of the underground space | gap structure pillar shown in FIG. (A)-(c) It is a longitudinal cross-sectional view which shows the creation process of the void structure pillar in the same ground. It is an expanded sectional view which shows the backfill material injection | pouring state at the time of sheath tube extraction in the manufacturing process same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excitation source 2 House 3 Column-arranged underground vibration barrier 4 Underground void structure pillar 10 Excavation hole 11 Cylindrical space structure 12 Filter 13 Backfill material 14 Through-hole 15 Pipe lead-out member 15a Base part 15b Spacer member 15c Backfill material lead-out path 16 Upper end closing tool 17 Backfill soil 20 Backfill material injection pipe 20a Steel pipe part 20b Synthetic resin hose part 22 Locking claw member 22a Tip 30 Drilling machine 31 Leader 32 Sheath pipe

Claims (5)

A large number of underground void structure pillars formed by embedding a cylindrical tubular void structure whose outer periphery is covered with a water-permeable nonwoven fabric vertically in the ground, with horizontal intervals. It is a construction method of a columnar underground vibration barrier that forms an underground vibration barrier consisting of columnar columns by
While inserting the sheath tube into the ground, the earth and sand in the sheath tube is discharged, and the pipe for backfill material injection is passed through the cylindrical tubular void structure, and the cylindrical void structure is inserted into the sheath tube. By inserting and then injecting a slurry-like backfill material under the lower end of the cylindrical void structure through the pipe while pulling up the sheath tube with the cylindrical void structure remaining in the ground. , tubular elements formula underground explosion isolating wall construction method of comprising as characterized by filling the backfill material on the outer periphery of the cylindrical void structure.   The cylindrical void structure is formed in a state in which a high-modulus synthetic resin wire is entangled in a string shape, the contact portions of each wire are integrated to have a porosity of 80% or more, and a through hole is formed in the center. The method for constructing a columnar underground vibration-proof wall according to claim 1, wherein the columnar-shaped underground vibration-proof wall is used.   The method for constructing a columnar underground vibration barrier according to claim 1 or 2, wherein the underground vibration barrier is formed by embedding underground void structure columns in a staggered arrangement. It has a flat plate-like base portion that comes into contact with the tip of the cylindrical gap structure, and has a pipe fitting hole into which the tip of the pipe for injecting the backfill material is fitted, and the through-hole on the side surface. Using a tip closing member having a lateral backfilling material outlet port where the tip of the pipe fitted in the hole communicates, the base portion upper surface of the tip closing member is brought into contact with the lower end of the cylindrical void structure, The columnar underground structure according to any one of claims 1 to 3 , wherein the cylindrical void structure is inserted into the sheath pipe with the lower end of the backfilling material injection pipe fitted into the pipe fitting hole. How to build a vibration barrier. A locking claw member that is locked downward with respect to the inner surface of the cylindrical void structure is fixed to the outer periphery on the lower end side of the pipe for injecting the backfill material, and the pipe is connected to the cylindrical void structure by the locking claw member. The method for constructing a columnar underground vibration barrier according to any one of claims 1 to 4, wherein the columnar type underground vibration-proof wall according to any one of claims 1 to 4, wherein the columnar-type underground vibration-proof wall is configured to be movable in the pull-out direction and immovable in the push-in direction. .

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