JPH0593428A - Cut-off method of vibration - Google Patents

Abstract

PURPOSE:To carry out cut-off execution of vibration in a residential district by boring a hole in the ground on a propagation path of vibration caused by street traffic and a railway or construction work, etc., and injecting buffer solution into the hole. CONSTITUTION:A boring rod 2 of a boring device 1 is inserted in the ground on a propagation path of vibration in a district generating a vibration pollution to bore a hole 3 up to a certain depth. After that, a buffer solution having urethane system chemical 4 as the constitutional characteristic is supplied to the boring rod 2 through a high pressure pump 5 and is injected into the ground from around the front end of the boring rod 2. Then, the buffer solution is injected from around the front end of the boring rod 2 while pulling up the boring rod 2. The progress of work injecting the buffer solution from around the front end of the boring rod 2 is continued until the front end of the boring rod 2 is drawn up around the ground surface. When the buffer solution having the urethane system chemical 4 as the constitutional characteristic is injected, the buffer solution becomes a sponge-like object, and a buffer wall 6 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for isolating vibrations, and more particularly to a method for isolating vibrations of traffic such as roads and railways and vibrations generated during construction work.

[0002]

2. Description of the Related Art Conventionally, the following techniques are known as methods for artificially and forcibly reducing the vibration in a place where the vibration source cannot be sufficiently separated. The main vibration propagating on the ground surface is cut by digging a groove on the ground surface on the vibration propagation path. Alternatively, a construction method is known in which an underground wall made of concrete or the like or a sheet pile is driven into the ground to absorb vibration.

[0003]

SUMMARY OF THE INVENTION The conventional vibration isolation method described above avoids carrying in heavy machinery for digging trenches in the ground surface, driving underground walls and sheet piles into the ground, and disturbing the ground. I can't. When cutting a groove by digging a groove on the ground surface, in order to reduce the amplitude of the vibration passing through the groove to half the amplitude of the vibration before passing through the groove, the depth of the groove should be 1/4 or more of the wavelength λ of the vibration. Must be done and requires a considerable amount of deep excavation. Therefore, it is difficult to construct in a narrow place where houses are densely packed. In addition, disposal of excavated earth and sand generated by digging a trench on the ground surface requires a great deal of work.

When the vibration is damped by the underground wall made of concrete or the buffer wall made of sheet pile, the characteristic of the vibration propagation from the soil in which the vibration propagates the underground wall made of concrete or the buffer wall made of the sheet pile. Impedance ρV
The material must have a small (ρ: density, V: propagation velocity). However, since the density ρ of concrete or sheet pile material is higher than the density ρ of soil, it is not possible to expect a vibration damping effect by the underground wall or sheet pile made of concrete or the like. Further, since the vibration propagation characteristic impedance ρV of the ground differs depending on the ground on which the vibration propagates, it is necessary to change the vibration propagation characteristic impedance ρV of the buffer wall according to the ground to be constructed and the wavelength of vibration. Therefore, an object of the present invention is to easily perform construction in a narrow place where houses are densely arranged, and to obtain a characteristic impedance ρ of vibration propagation.
It is possible to create a cushioning material that can select a wide range of V, and to provide a method of blocking vibration of traffic and construction pollution that has a large vibration damping effect.

[0005]

The present invention is directed to road traffic,
In areas where vibrations are caused by railways or construction work, the ground of the vibration propagation path is drilled with a boring device, and a urethane-based chemical solution is injected into the holes by the injection method to buffer it. A method for isolating vibration is provided, which is characterized by creating a wall.

[0006]

According to the method for blocking vibration of traffic and construction pollution of the present invention, a cushioning material having a constitutional feature of urethane chemicals in the propagation path of vibration in an area where vibration pollution occurs due to road traffic, railway or construction work. Inject. When a shock-absorbing material characterized by a urethane-based chemical solution is injected, a sponge-like object is created, which serves as a shock-absorbing material with a small characteristic impedance ρV for vibration propagation, and forms a highly vibration-proof wall to reduce vibration propagation. ..

[0007]

The present invention will be described in more detail with reference to the embodiments shown in the drawings. However, this does not limit the present invention. FIG. 1 is a cross-sectional view for explaining a vibration isolation method according to an embodiment of the present invention. The boring device 1 is a device that can easily perform drilling work to a relatively deep position. The boring rod 2 is a part of the boring device 1 for making a hole. The hole 3 is a hole drilled by the boring rod 2. The urethane-based chemical liquid 4 is a buffer material that is characterized by the constitution of the urethane-based chemical liquid, and when injected into the ground, a sponge-like object is created, and the urethane-based chemical liquid serves as a buffer material having a small characteristic impedance of vibration. The high-pressure pump 5 is a pump for sending the urethane chemical liquid 4 to the boring rod 2 and injecting the urethane chemical liquid 4 into the ground from near the tip of the boring rod 2. The buffer wall 6 is a wall formed by pouring the urethane chemical liquid 4 into the ground to form a sponge-like object.

Next, the procedure for creating the vibration isolation method according to the present invention will be described. First, in a region where vibration pollution occurs due to road traffic, railroads, construction work, etc., drilling work is performed on a vibration propagation path. The boring rod 2 of the boring device 1 is inserted into the ground to dig a hole 3 to a predetermined depth. If the depth of the hole 3 is not more than ¼ of the wavelength λ of the vibration to be cut off, which is expected or observed,
It is not possible to reduce the vibration amplitude to less than half by this vibration isolation method. In addition, the vibration characteristic impedance of the ground is measured during the boring operation by the boring device 1. Then, a cushioning material having a constitutional characteristic of a urethane-based chemical solution, which is adapted to the vibration characteristic impedance ρV of the ground, is manufactured. The cushioning material is sprayed from near the tip of the boring rod 2 inserted to the deepest part of the hole 3. Further, while pulling up the boring rod 2, the cushioning material is sprayed from near the tip of the boring rod 2. The step of injecting the cushioning material from the vicinity of the tip of the boring rod 2 is continued until the tip of the boring rod 2 is pulled up to the vicinity of the ground surface. In the above steps, the cushioning material ejected into the ground becomes a sponge-like object, and a part of the cushioning wall 6 is formed. The buffer wall 6 is completed by repeating the above steps by gradually moving the position for drilling.
As described above, according to the present invention, since a large-scale heavy machine is not required for construction, construction can be easily performed in a narrow place where houses are densely formed, and a cushioning material capable of widely selecting the characteristic impedance ρV of vibration propagation is created. It is possible to provide a method of blocking vibration of traffic and construction pollution that has a large vibration damping effect.

FIG. 2 is a plan view for explaining the injection direction of the cushioning material and the shape of the cushioning wall 6 in one embodiment of the present invention.
As shown in FIG. 2 (), the cushioning material is jetted into the ground symmetrically with respect to the hole 3a. As shown in FIG. 2 (), the cushioning material injecting place 8a becomes a sponge-like object, and a part of the cushioning wall 6 is formed. As shown in FIG. 2 (), the hole 3b is drilled again in the injection direction 7b of the cushioning material in FIG.
The cushioning material is sprayed into the ground toward a and symmetrically with respect to the hole 3b. The buffer wall 6 is completed by repeating the above process and FIG. 2 () to FIG. 2 (). FIG. 3 is a plan view of the buffer wall 6 constructed by the vibration isolation method according to the embodiment of the present invention. The buffer wall 6 is shown in FIGS.
It is a wall provided in the ground constructed by the construction method described in. As shown in FIG. 3, the buffer wall 6 is installed on the vibration propagation path between the vibration source 9 and the building structure 11. The vibration wave 10a emitted from the vibration source 9 is attenuated by the buffer wall 6, and the amplitude of the vibration wave 10b passing through the buffer wall 6 is the vibration wave 10a.
Is less than half the amplitude of. Therefore, the buffer wall 6 can prevent vibration pollution and the like due to the vibration wave 10 a emitted from the vibration source 9.

FIG. 4 is a sectional view of the buffer wall 6 constructed by the vibration isolation method according to the embodiment of the present invention.
Assuming that the wavelength of the vibration 10a generated from the vibration source 9 is λ and the depth of the buffer wall 6 is L, if L> 1 / 4λ (1), the amplitude of the vibration 10b passing through the buffer wall 6 is the vibration 10a. Cannot be less than half the amplitude of. Further, let ρ be the density of soil that the vibration 10a propagates at this time, V be the propagation velocity of the vibration 10a, and let ρ ′ be the density of the buffer wall 6 and V ′ be the velocity that the vibration propagates in the buffer wall 6. The buffering effect cannot be obtained unless ρV>ρ'V'(2). Since the buffer wall 6 constructed by the vibration isolation method according to the present invention can satisfy the above equations (1) and (2), the vibration isolation method having a large vibration isolation effect such as traffic and construction pollution can be used. Can be provided.

[0011]

According to the method for isolating vibrations such as traffic and construction pollution of the present invention, a large-scale heavy machine is not required for construction, and therefore construction in a narrow space such as densely packed houses can be easily performed. Further, since the boring device is used for the drilling, it is possible to easily drill a relatively deep position. Further, since the urethane chemical liquid is used as the buffer material, a wide variety of buffer materials having the characteristic impedance ρV of vibration propagation adapted to the region can be prepared by blending the urethane chemical liquid and the substances of other components. Therefore, it is possible to provide a method for blocking vibration such as traffic and construction pollution, which has a great effect of damping the vibration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view for explaining a vibration isolation method according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating the injection direction of the cushioning material and the shape of the cushioning wall in the embodiment of the present invention.

FIG. 3 is a plan view of a buffer wall constructed by a vibration isolation method according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of a buffer wall constructed by a vibration isolation method according to an embodiment of the present invention.

[Explanation of symbols]

 1 Boring Device 2 Boring Rod 3 Hole 4 Urethane Chemical Solution 5 High Pressure Pump 6 Buffer Wall 7 Buffer Injection Direction 8 Buffer Injection Site 9 Vibration Source 10 Vibration Wave 11 Building Structure

Claims (1)

[Claims] 1. In a region where vibration is caused by road traffic, railroad, construction work, etc., a hole is bored by a boring device on the ground of the propagation path of the vibration, and a urethane type chemical solution is used as a buffer in the hole. A vibration isolation method characterized by injecting a material by a jetting method to create a buffer wall.