JP2008045367A - Ground consolidation construction method and ground-subsidence correction construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reinforce only a ground to be reinforced without having an adverse effect on a peripheral ground regarding a ground-subsidence correction construction method. <P>SOLUTION: In the ground-subsidence correction construction method reinforcing a foundation for a building, a pipe 2 is inserted into the ground 1 to be improved, water 3 as a high-pressure water current is injected from the front end section of the pipe and the peripheral ground is crushed and water 3 as the high-pressure water current is recovered while the crushed soil and sand 4 of the crushed ground is recovered. In the ground-subsidence correction construction method, the volume of a space 5 formed to the ground is measured previously, and the space 5 is filled with fillers capable of controlling a curing time, a strength and a viscosity by a pressure pump. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention, for example, in a relatively light wooden or steel-based house, when a building is constructed on soft ground, there is a risk that the ground will sink due to subsequent secular change, and the building may be inclined. The present invention relates to a ground consolidation method and a ground subsidence correction method for reinforcing the foundation of a building and stopping ground subsidence.

  Conventionally, when the ground is soft, the building tilts or the ground sinks due to secular change. In addition, there is a phenomenon that the building tilts due to the water drawing at the adjacent building construction site and the ground collapse. In such a case, there are a case where a pile-shaped body is created by an injection ground improvement method and a case where the ground is strengthened by press-fitting an injection material into a void in the ground. Moreover, when restoring a sunken building, there is a method of moving the building temporarily, driving piles to a solid ground, building a new foundation, and returning the building to its original state.

Since the construction method to move the building is expensive, in recent years, without moving the building, dig the bottom of the foundation of the building, install the pile with the reaction force of the building with a jack, and modify the building from the foundation There are many. In this case as well, a large number of holes are required around the building. On the other hand, as a construction method with a small amount of excavation of the ground, there is a restoration method for the subsidence board by ground injection. In this method, an appropriate depth is specified near the foundation creation site or near the foundation of the modified building, an injection pipe is inserted into the ground pillar, high pressure chemical is ejected from the insertion pipe, the ground is expanded, and the ground is There is known a method of raising and correcting uneven settlement of a building on the ground or creating a pile (see Patent Document 1).
JP 2005-273137 A

  However, in the above-mentioned ground injection method, the amount of ground expansion and the amount of uneven settlement of the building on the ground do not match, the ground does not swell reliably, and the injection material flows and unexpected parts rise, , Damage to the ground, high-pressure chemicals flow in the weak direction of the ground, so expansion management is impossible, the strength of the solidified solid of the injected chemicals cannot be obtained sufficiently, the garden of the neighboring house rises, etc. There are problems such as giving. The ground subsidence correction method according to the present invention has been proposed in order to solve such problems.

  The gist for solving the above problems of the ground subsidence correction method according to the present invention is to reinforce the foundation of the building, and a pipe is inserted into the ground to be improved, and the tip portion of the pipe Water is sprayed as a high-pressure water stream, the surrounding ground is pulverized, and the ground soil that has been pulverized together with the recovery of the water is recovered, and the volume of the space formed in the ground is measured in advance, and the space In addition, a filler capable of managing the solidification time, strength, and viscosity is filled with a pressure pump.

In the space formed in the ground, when there is a crack penetrating into the ground from the surface of the space, the space is filled with crushed earth or sand or bentonite solution to close the crack, and then the sealed space It also includes press-fitting a fluid to be solidified into the container.
The gist of the ground consolidation method according to the present invention is that the ground is formed by inserting a pipe into the ground, injecting water as a high-pressure water stream from the tip of the pipe, pulverizing the surrounding ground, and pulverizing with the recovery of the water. The volume of the space formed in this ground is measured in advance, and the space is filled with a filler capable of managing solidification time, strength and viscosity with a pressure pump.

According to the ground consolidation method and ground subsidence correction method of the present invention, the formation of the space in the ground is managed and the bottom is filled with fluid, so that the secondary ground can be obtained without adversely affecting the surrounding ground. A disaster can be reliably prevented. Then, by creating an underground space portion in advance and creating a pressure reservoir, a high expansion force is exhibited at a low pressure.
In addition, since the fluid filled in the space can be managed, it is easy to secure the amount of uplift of the ground and the place of reinforcement, and the restoration due to the ground expansion of the building in the state of uneven settlement becomes easy.
Furthermore, since various spaces can be formed in the ground, various and multi-shaped piles can be constructed, and a pile suitable for the ground to be reinforced can be formed.
Since the fluid that fills the space does not flow around, the environmental measures are improved, there is no adverse effect on neighboring surrounding areas, gypsum is easy, and the cost can be reduced. Since the construction machine used in this construction method is also small and light, it can be easily moved in a narrow place, can be transported by a person, can be easily installed, and the construction period can be shortened.

  As shown in FIG. 1, the ground consolidation method and the ground settlement correction method according to the present invention are as follows. First, if there is a risk that the building constructed on the soft ground may be inclined due to secular change, etc. The pipe 2 is inserted into the ground 1 to be improved. Water 3 is jetted as a high-pressure water stream from the tip 2a of the pipe 2. As a result, the ground around the tip 2a is pulverized, and the ground crushed earth and sand 4 that has been pulverized together with the recovery of the water 3 and has come out on the ground is recovered by an above-ground earth and sand recovery device (not shown).

  The pipe 2 may be a double pipe. In that case, the inner pipe is an injection pipe for water 3, and the space between the outer pipe is a collection pipe for recovered water and crushed earth and sand. . Further, the crushed earth and sand 4 is not simply collected, but the volume of the crushed earth and sand 4 is measured by the earth and sand collecting device.

  Thereby, the volume of the space 5 formed in the ground 1 is measured in advance. Next, as shown in FIG. 2, the space 5 is filled with a filler 6 such as a chemical solution capable of managing the solidification time, strength, and viscosity with a pressure pump. The filling amount is the volume of the measured space 5.

  In the space 5 formed in the ground 1, as shown in FIG. 1 (B), when there is a crack 7 penetrating from the surface of the space 5 into the ground, the ground earth or bentonite solution is added to the ground 5 or the bentonite solution. The space 5 is filled to close the crack 7. After that, the filler 6 to be solidified is press-fitted into the sealed space 5 and filled. Thus, the sealed space 5 is expanded in the ground 1 as shown in FIG. 2 and reinforced so as not to sink.

  Next, as shown in FIGS. 3A and 3B, the space 5 is continuously formed by gradually pulling up the water 3 while injecting the high-pressure water stream 3 from the pipe 2.

  Then, as shown in FIG. 4A, the continuous space 5 is filled with the filler 6 and expanded from the bottom of the space 5. And it expands to the upper part of the said space 5, as shown in FIG.4 (B). Thereby, since the ground 1 was reinforced and strengthened, the settlement of a building or the ground can be prevented.

  As another embodiment of the present invention, as shown in FIG. 5 (A), a pipe 2 is inserted obliquely into the ground 1 to inject water 3 at a high pressure to form a space 5, and then a filler. 6 is press-fitted and expanded. Thereby, the sinking foundation 8 etc. are lifted and corrected. FIG. 2B is also for expanding the space 5 by inserting the pipe 2 obliquely into the ground 1.

  Further, as shown in FIG. 6 (A), the water 3 is ejected from the pipe 2 in one direction at a high pressure to form a space 5, and a filler 6 is press-fitted into the space 5 to be expanded. is there. As shown in FIG. 6 (B), the space 2 is formed by injecting water 3 of a high-pressure water flow in multiple stages with the pipe 2 inserted obliquely into the ground 1. And the filler 6 is press-fitted and expanded in the spaces 5, 5,... Formed in multiple stages, and construction can be performed with the expansion pressure lowered. As shown in FIG. 6 (C), this also forms the spaces 5 in a multistage manner, and can suppress the pressure input of the filler 6 to each space 5 to reduce the expansion pressure, so that the ground reliably This is a method of expanding 1.

It is explanatory drawing (A) which shows the procedure of the ground consolidation method and ground settlement correction method which concern on this invention, and explanatory drawing (B) which shows a mode that the space 5 was made in the ground. It is explanatory drawing which press-fits the filler 6 in the space 5, is filled, and the space 5 is expanded. It is explanatory drawing (A) which shows a mode that the space 5 is continuously formed to the upper part in the ground 1, and explanatory drawing (B) of the state which the space 5 was made. It is explanatory drawing (A) which shows a mode that the filler 6 is press-fitted in the space 5, and expands from the bottom part of the space 5, and explanatory drawing (B) of the state expanded to the upper part. An explanatory view (A) showing a state in which the pipe 2 is inserted obliquely into the ground 1 to form a space 5 and a filler 6 is press-fitted to expand the ground 1 and an explanatory view showing another embodiment (B) ). The other examples in the ground consolidation method and the ground subsidence correction method according to the present invention are shown. Water 3 is injected from the pipe 2 in any one direction to form a space 5 and a filler 6 is press-fitted there. Explanatory drawing (A) which shows a mode that it fills and expands, and explanatory drawing which shows a mode that the space 5 is similarly formed in multiple stages in the up-and-down direction, the expansion pressure of the filler 6 is lowered, and the ground is reliably expanded. B) and (C).

Explanation of symbols

1 ground,
2 pipes,
3 water,
4 crushed earth and sand,
5 space,
6 Filling material,
7 cracks,
8 Basics.

Claims (3)

This is a method to reinforce the foundation of the building. A pipe is inserted into the ground to be improved, water is injected from the tip of the pipe as a high-pressure water stream, the surrounding ground is crushed, and the water is recovered and crushed. Collecting the ground crushed earth and sand, measuring the volume of the space formed in this ground in advance, and filling the space with a filler capable of managing the solidification time, strength and viscosity with a pressure pump;
Land subsidence correction method characterized by In the space formed in the ground, if there is a crack that penetrates into the ground from the surface of the space, the crack is filled with crushed earth or sand or bentonite solution, and then the sealed space is filled. Press-fitting the filler to be solidified,
The ground subsidence correction method according to claim 1. A pipe is inserted into the ground, water is sprayed from the tip of the pipe as a high-pressure water stream, the surrounding ground is crushed, and the ground soil that has been crushed along with the recovery of the water is collected and formed on this ground Measuring the volume of the space formed in advance, and filling the space with a filler capable of managing solidification time, strength and viscosity with a pressure pump;
A ground consolidation method characterized by

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