JP2001226999A - Vibration shielding wall and its constructing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a vibration shielding wall, comprising a single wall body, to demonstrate a sufficient vibration shielding effect while the vibration shielding wall is constructed at a large depth without requiring discharge of sediment, independent of a ground condition. SOLUTION: Columnar bodies 2 and 2' where a vibration shielding material is molded into a column are inserted, in parallel, in the wall body of a soil cement 3. An endless chain 17 comprising a cutting blade 18 is allowed to traverse underground while circulating around a cutter post 12, while a solidifying liquid is discharged from the lower end part of the cutter post 12 or near a ground surface to construct the wall body of the soil cement 3. Before the soil cement 3 is solidified, the columnar bodies 2 and 2' are inserted, in parallel, in the soil cement 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration blocking wall for blocking vibration propagating in the ground, and a method of constructing the same.

[0002]

2. Description of the Related Art Conventionally, as a vibration isolating wall for isolating vibrations in the ground, a trench of an empty moat having no filling has been used.
It has been proposed to fill a groove with a vibration-insulating material such as rubber or foamed plastic as disclosed in Japanese Patent Application Laid-Open No. 63-97728 and Japanese Patent Application Laid-Open No. 63-97728.

[0003]

In this case, in order to effectively block vibrations, it is necessary to construct a barrier wall deep underground. There is a limit to the depth of the groove to be constructed, as this is not the case and the greater the depth of the groove, the more easily the walls of the groove collapse. In particular, only a shallow groove can be constructed under the ground condition that easily collapses, and a satisfactory vibration isolation effect cannot be obtained with a single vibration isolation wall.

For this reason, in order to obtain a sufficient vibration shielding effect, it is necessary to construct at least two vibration shielding walls at intervals as in Japanese Patent Application Laid-Open No. 63-97728. The area occupied by the site has expanded, and it is not possible to respond to limited sites. In addition, both in the case of a hollow trench and in the case of filling the trench with a vibration-blocking material, the earth and sand must be discharged to the ground in order to construct a vibration-blocking wall. In addition, extra work steps and places are required, and as described above, the depth of the vibration isolation wall that can be constructed is limited depending on the ground conditions. Can not expect.

[0005] In view of the above background, the present invention proposes a vibration isolation wall which can exhibit a sufficient vibration isolation effect even though it is a single wall body, and which can be easily constructed without discharging earth and sand, and a construction method thereof. Things.

[0006]

According to the first aspect of the present invention, a columnar member formed by shaping a vibration-isolating material into a columnar shape is inserted side by side into a soil cement wall, so that a single wall is sufficient. In addition to exhibiting a vibration blocking effect, it is possible to complete construction without discharging earth and sand.

The columnar body may be formed, for example, by bundling an elongated vibration-insulating material into a columnar shape, or by surrounding the vibration-insulating material with a net or a water-permeable geotextile as described in claim 2. Is done. For the latter column, for example, a granular or finely cut or crushed form of vibration damping material is used, and since the material itself is fine, the effect of adhering to soil cement is enhanced.

In any case, the vibration isolating material is inserted in parallel into the soil cement wall as a columnar body, so that it is securely fixed in the soil cement wall together with solidification of the soil cement, Can be arranged evenly over the entire depth, so that the vibration isolation effect is exerted over the entire depth. In particular, in the case of the second aspect, since the geotextile having netting or water permeability has an advantage of good adhesion to the soil cement, the fixing effect on the soil cement wall is high.

The vibration isolating material is integrated with the soil cement over the entire depth of the wall, so that a single wall can be used to isolate the vibration over the entire depth and the entire length of the wall. In order to exhibit the effect, a sufficient vibration shielding effect can be expected while suppressing the occupied area as the vibration shielding wall.

Since the vibration isolation wall is constructed by inserting the columnar body's vibration isolation material into the soil cement wall, the ratio of the vibration isolation material to the total volume of the vibration isolation wall increases. The vibration blocking effect of the vibration blocking material on the vibration blocking wall is enhanced.

In addition, since the vibration isolation wall is not a groove but a soil cement wall, a vibration isolation wall at a large depth can be constructed regardless of the ground conditions. By changing the value, the degree of the vibration blocking effect can be freely controlled.

In addition, since the vibration isolating wall is mainly made of soil cement, it can be constructed by the procedure of stirring and mixing the solidified material and the earth and sand without discharging the earth and sand unlike the case of forming a groove. Alternatively, a processing place or the like becomes unnecessary, and the construction is simplified, and the construction efficiency is improved.

The stirring / mixing process is performed not only by rotating and mixing by rotation of a drilling rod having stirring blades, but also by circulating an endless chain mounted around the cutter post. In the former case, the vibration isolating wall is formed in a continuous shape with overlapping cylinders, and in the latter case, the vibration isolating wall is formed in a continuous shape with a constant width.

Examples of the material that can be used as the vibration isolation material include foamed plastics such as styrene foam and olefin foam, and rubber materials used for tires, belts and the like. When the vibration-blocking material itself is bundled and formed into a columnar shape, it is formed by directly bundling a rubber material having a length, such as rubber for a belt conveyor, and does not need to be cut or crushed.

In the case of the second aspect, the above-mentioned material is used, for example, cut or crushed into a size of about one to several centimeters square or one to several centimeters in diameter. In these cases, the size of the cut or crushed vibration-insulating material is not particularly limited. However, in order to exhibit the vibration-isolating performance while ensuring ease of construction, about 1 to 5 cm square or 1 mm in diameter. A size of about 5 cm is most preferred.

[0016] In addition to the above examples, the vibration-isolating material has a granular shape.
Styrofoam beads having a small diameter, crushed discarded styrofoam products, and cut rubber materials such as discarded tires and belt conveyors are also used. If the discarded product is used as a vibration isolation material, not only will the waste be disposed of, but also the waste will be effectively used.

In the second aspect, the net or geotextile surrounding the vibration-insulating material only needs to have water permeability, such as a net made of fibers such as polyethylene, polyester, or polypropylene; In addition to knitting, a resin grid or a resin net is used.

The vibration isolating wall is traversed in the ground while circulating the endless chain having the cutting blade around the cutter post, and is solidified from the lower end of the cutter post or from the vicinity of the ground surface. The soil cement wall is constructed by discharging a material liquid, and before solidification of the soil cement wall, a columnar body made of a vibration isolation material is inserted into the soil cement wall while being juxtaposed.

According to the fourth aspect of the present invention, since the columnar body of the vibration isolating material is inserted into the soil cement in which the original soil constituent material, such as earth and sand, is mixed with the solidifying material liquid on the spot, the entire amount of earth and sand is ground. No need to discharge. In addition, the construction part of the vibration isolation wall does not become hollow, and the filled soil cement balances the earth pressure on the wall surface, so that it is possible to construct to a deep depth.

In this case, there is a possibility that the soil cement corresponding to the volume of the columnar body may overflow due to the insertion of the columnar body into the soil cement. In such a case, it is expected that the soil cement will be constructed prior to the construction of the vibration isolation wall. After removing a volume of earth and sand corresponding to the amount of overflow to the ground, a vibration isolation wall is constructed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vibration isolating wall 1 according to the present invention is constructed by inserting a columnar body 2 formed of a vibration isolating material into a columnar shape as shown in FIG. You. In FIG. 1- (a), reference numeral 4 denotes a stratum where vibration does not propagate.

FIG. 3 shows a case in which a columnar body 2 'is formed by bundling an elongated vibration isolating material such as a waste belt conveyor rubber 7 shown in FIG. 2- (c), and FIG. , (B)
2 shows a case where the columnar body 2 is formed by surrounding a vibration-insulating material 9 obtained by finely cutting or crushing a waste tire 5 or a waste foamed styrene product 6 with a net or a geotextile 8 having water permeability.

The net or geotextile 8 is continuous in the circumferential direction as shown in FIGS. 1 (a) and 4 and has a cylindrical shape with both ends or one end open, and a fastener 10 or the like as shown in FIG. There is a tubular shape whose side can be freely opened and closed, and when both ends and one end are open, the open end is closed as shown in FIG. 1- (a) by a binding string as shown in FIG. Figure 1
(b) shows the cross section of (a), and (c) shows the cross section when the columnar body 2 'shown in FIG. 3 is used.

FIG. 6 shows an example of a construction apparatus 11 used for constructing the wall of the soil cement 3 and the vibration isolating wall 1, and FIG. 7 shows details of a tip portion of the cutter post 12 in FIG. The installation device 11 is an endless chain with a cutter post 12 and a free-circular mounting around it, with a cutting blade 18 on the outer periphery.
An excavating device 13 composed of 17; a frame 15 for supporting the excavating device 13 so as to be able to traverse the main body of the construction device 11;
It has a traversing device 25 for traversing the 13.

A discharge port 19 for discharging a solidifying material liquid is provided at the lower end of the cutter post 12 or near the ground surface. As shown in FIG.
In the case of being located at the lower end portion, the solidified material liquid is supplied from the ground to the discharge port 19 through the pipe 20. The solidifying material liquid is, for example, a solidified material such as various cements or gypsum which is made into a milk state together with water.

The frame 15 is connected to a leader post 14 for guiding the excavator 13 to move up and down. The excavator 13 moves along the frame 15 together with the leader post 14 when traversing, and moves along the leader post 14 when ascending and descending. Go up and down.
The frame 15 is also connected with a traversing device 25 such as a plurality of hydraulic jacks for causing the rig 13 to traverse with the leader post 14, and the other end of the traversing device 25 is connected to the cutter post 12 or the like of the digging device 13. You.

When the traversing device 25 is a hydraulic jack, the excavator 13 and the leader post 14 are moved with respect to the frame 15 by extending or contracting the stroke of the hydraulic jack while keeping the construction device 11 main body stationary. The ground is excavated and the soil cement 3 is constructed by circulating the endless chain 17 around the cutter post 12 while simultaneously discharging the solidifying material liquid.

After the excavator 13 and the leader post 14 have moved a fixed distance, the stroke of the hydraulic jack is contracted or extended while the excavator 13 and the like are kept stationary with respect to the ground, and the caterpillar 16 of the construction device 11 is moved. The movement of the main body of the construction apparatus 11 is completed by moving the hydraulic jack relative to the excavator 13 and the like in the opposite direction in accordance with the contraction speed of the hydraulic jack. The wall of the soil cement 3 is continuously constructed by repeating the movement of the excavator 13 and the like by the traversing device 25 and the movement of the construction device 11 main body. The movement of the excavator 13 and the like and the movement of the construction apparatus 11 main body are performed in either of the right and left directions in FIG.

FIG. 8 shows that prior to the construction of the wall of the soil cement 3, the soil excavated at the surface portion having a volume corresponding to the amount of overflow to the ground expected due to the construction is removed.
Although the case where 21 is formed is shown, even when the preceding excavation groove 21 is not formed, the wall of the soil cement 3 is constructed in the manner shown in FIG. 9. The earth and sand removed here does not contain a solidifying material such as cement, so that it is easy to dispose.

After the excavator 13 is set at the construction start position of the wall of the soil cement 3, the excavator 13 is inserted into the ground while circulating the endless chain 17 around the cutter post 12, as shown in FIG. . Thereafter, the wall of the soil cement 3 is constructed by discharging the solidifying material liquid from the lower end portion of the cutter post 12 or the discharge port 19 near the ground surface at the same time as the excavator 13 is traversed.

After the construction of the wall of the soil cement 3, FIG.
As shown in FIG. 11, before the soil cement 3 is solidified, the columnar bodies 2 and 2 ′ formed by shaping the above-mentioned vibration isolation material into columns are inserted into the wall of the soil cement 3 while being arranged in parallel. When the wall of the soil cement 3 is vertical as shown, the columns 2, 2 'are inserted substantially vertically, but this is not necessary.

The insertion of the pillars 2 and 2 'is performed, for example, by using a steel pressing jig 22 having a U-shaped cross section as shown in FIG. 10, or by using an endless chain 17 as shown in FIG. This is done by: In the case of FIG. 10, as shown in FIG. 12- (a), an anchor 24 such as a plate is connected to the lower end of the columnar body 2 or 2 'by a wire 23 or the like, and the anchor 24 is pushed in and locked to the lower end of the jig 22. By pushing the pushing jig 22 into the soil cement 3 in the folded state, the columnar bodies 2, 2 ′ are inserted into the soil cement 3. After that, the pushing jig 22 is pulled up to leave the columnar bodies 2 and 2 ′ in the soil cement 3 and the pushing jig 22 is collected. FIG.
(B) shows (a) viewed from the anchor 24 side.

The pushing and pulling of the pushing jig 22 is performed by using a heavy machine, and the pushing jig is pushed into the endless chain 17.
This is performed by connecting a part of the 22 and utilizing the positive and negative circulation of the endless chain 17. In Fig. 10-Fig. 12, fine cutting,
Alternatively, a columnar body 2 formed by surrounding a crushed vibration-blocking material 9 with a net or a geotextile 8 having water permeability is used, but a columnar body formed by bundling and shaping an elongated vibration-blocking material. 2 'is similarly implemented.

[0034]

According to the first and second aspects of the present invention, the pillars formed by shaping the vibration insulating material into pillars are inserted side by side into the wall of the soil cement, so that the solidification of the soil cement and the fixing to the wall of the soil cement are ensured. It is possible to dispose evenly over the entire depth of the soil cement wall, and to exert the vibration isolation effect over the entire depth while suppressing the occupied area as a vibration isolation wall with a single wall. be able to.

In particular, by enclosing the vibration-insulating material with a net or a geotextile having water permeability, the adhesiveness with the soil cement is good, so that the fixing effect on the soil cement wall is high. In addition, since the vibration isolation wall is mainly made of soil cement, it can be constructed by the procedure of agitation and mixing of the solidified material and earth and sand, without the need to discharge earth and sand as in the case of forming a groove. In addition to eliminating the necessity, construction is simplified and construction efficiency is improved.

In addition, since the vibration-blocking wall is formed by inserting the columnar-shaped vibration-blocking material into the soil cement wall, the ratio of the vibration-blocking material to the entire volume of the vibration-blocking wall increases. Therefore, the vibration blocking effect of the vibration blocking material on the vibration blocking wall is enhanced.

According to a second aspect of the present invention, the vibration insulating material is surrounded by a net or a geotextile having water permeability.
If you use a crushed styrofoam product discarded as a vibration isolation material in the above, or cut rubber material such as discarded tires and belt conveyors, not only will waste be treated, It also makes effective use of waste.

According to a fourth aspect of the present invention, the endless chain having the cutting blade is traversed in the ground while being circulated around the cutter post, and at the same time, the solidifying material liquid is discharged from the cutter post to construct a soil cement wall. Before the solidification of the wall, a column made of a vibration-insulating material is inserted into the soil-cement wall while inserting it in parallel, so that the vibration-insulating wall is constructed.Therefore, it is not necessary to discharge the entire amount of earth and sand to the ground.
Since the construction portion of the vibration isolation wall does not become hollow, it is possible to construct the vibration isolation wall to a deep depth.

[Brief description of the drawings]

FIG. 1 (a) is an elevation view showing a columnar body inserted into a soil cement wall, (b) is a cross-sectional view of (a), and (c) is another columnar body inserted. It is the cross-sectional view which showed the situation.

FIGS. 2 (a) to 2 (c) are perspective views showing raw materials of a vibration isolation material.

FIG. 3 is a perspective view showing a columnar body formed by bundling the raw materials of the vibration isolation material without cutting them.

FIG. 4 is a perspective view showing a columnar body formed by cutting a raw material of a vibration-blocking material and surrounding the material with a net or geotextile.

5 is a perspective view showing a case where a fastener is attached to a side surface of the net or the geotextile shown in FIG. 4;

FIG. 6 is an elevation view showing the construction apparatus.

FIG. 7 is an elevational view showing details of a tip portion of the cutter post of FIG. 6;

FIG. 8 is a perspective view showing a state where a preceding excavation groove is formed.

FIG. 9 is a perspective view showing how a soil cement wall is constructed by the excavator.

FIG. 10 is a perspective view showing a state in which a columnar body is inserted using a pushing jig.

FIG. 11 is a perspective view showing how a columnar body is inserted using an excavator.

12A is a perspective view showing an example of connection between a pushing jig and a columnar body, and FIG. 12B is a perspective view showing the opposite side of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vibration isolation wall, 2, 2 '... Column-shaped body, 3 ... Soil cement, 4 ... Stratum in which vibration does not propagate, 5 ... Waste tire, 6 ... Waste expanded styrene product, 7 ... Waste belt Conveyor rubber, 8 ... geotextile, 9 ... vibration isolation material, 10 ... fastener, 11 ... construction equipment, 12 ...
Cutter post, 13… Excavator, 14… Leader post, 15… Frame, 16… Caterpillar, 17… Endless chain, 18… Cutting blade, 19… Discharge port, 20… Pipe,
21: advance digging groove, 22: pushing jig, 23: wire, 24: anchor, 25: traversing device.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shiro Tanamura 2-8-8 Hikaricho, Kokubunji, Tokyo Metropolitan Institute of Technology (72) Inventor Masayuki Kanda 2-8-8 Hikaricho, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor Satoshi Takizawa 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Within the Railway Technical Research Institute (72) Inventor Kosei Fukuda 6-13-7 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. (72) Inventor Yoji Shitomi 6-13-7 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. (72) Inventor Shigeru Yoshida 6-13-7 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. (72 ) Inventor Shuji Kami 6-13-7 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. (72) Inventor Hideki Kimura 6 Akasaka, Minato-ku, Tokyo Chome 13-7 Tenox Co., Ltd.

Claims (4)

[Claims] 1. A vibration isolating wall in which a columnar body formed of a vibration isolating material in a columnar shape is inserted in parallel into a soil cement wall. 2. The vibration isolation wall according to claim 1, wherein the columnar body is formed by surrounding the vibration isolation material with a net or a geotextile having water permeability. 3. The vibration isolating wall according to claim 1, wherein the vibration isolating material is at least one of a foamed plastic and a rubber material. 4. An endless chain having a cutting blade is circulated in the ground while being circulated around a cutter post, and at the same time, a solidifying material liquid is discharged from a lower end portion of the cutter post or near the ground surface to lay the soil cement wall. And a method of constructing a vibration isolation wall in which, before the soil cement wall is solidified, a columnar body formed by shaping a vibration isolation material into a columnar shape is inserted into the soil cement wall while being arranged in parallel.