JP3256727B2 - Dynamic ground grasp system for soft ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for grasping the dynamics of a soft ground, which is capable of accurately determining the dynamics of the soft ground so as to accurately judge the termination of settlement of the soft ground.

[0002]

2. Description of the Related Art When installing structures, such as houses, water and sewage systems, retaining walls, and paved roads, and embankments on soft ground, if these structures and embankments are installed before the subsidence of the ground is completely completed, the softness will increase. Since the ground has a very low bearing capacity, it cannot support the loads of these structures and the embankment, causing uneven settlement, and as a result, the structures and the embankment on the soft ground are damaged. This can lead to more than just damage to structures and embankments, but also to catastrophes involving human life.

[0003] For this reason, the installation of structures and embankments on soft ground has been carried out after the subsidence of the ground has been completely completed. At this time, the termination of settlement of the soft ground was determined by measuring the behavior of the settlement meter. In addition, in order to ensure reliability, materials were collected by boring, and analysis such as a strength test was performed. In some cases, termination was determined based on the results of the analysis.

[0004]

However, when judging the end of settlement of soft ground only by measuring the behavior of a settlement meter, the measurement involves an artificial error and accurate measurement is performed. It is difficult to determine the end of subsidence, and it is difficult to determine the settlement end.Moreover, even if it is soft ground, there are various types, the depth and the stratum are different, so for example, the amount of subsidence has decreased. It was too reckless and dangerous to judge the termination based solely on the behavior of the sinkometer.

[0005] Collection and analysis of data by drilling is a very effective means for judging the termination of settlement of soft ground. However, collecting and analyzing materials by boring requires a large amount of money, and therefore, the places where boring investigation can be performed are limited.

[0006] Under such circumstances, when a structure or embankment is to be installed on a soft ground, a support pile or the like is previously poured into the ground for safety and the structure or embankment is installed thereon. That method was adopted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object of grasping the dynamics of a soft ground with high accuracy so that it is possible to accurately determine the termination of settlement of the soft ground. The purpose is to provide.

[0008]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 comprises means for grasping an overburden load on soft ground, means for grasping the amount of ground subsidence due to the overburden load, The gist of the present invention is a system for grasping the dynamics of soft ground, which comprises means for grasping the amount of condensed water drained due to land subsidence and means for grasping the temperature of water drained from the ground.

According to a second aspect of the present invention, there is provided an airtight sheet covering a surface layer of a soft ground, a water pipe connected to a vacuum pump previously installed in the soft ground, Drain material which is cast at a predetermined interval in the soft ground and has an upper end connected to the water pipe, and a pressure gauge installed in the soft ground and / or on the soft ground surface layer, and is covered with the airtight sheet. The dynamics of soft ground characterized by measuring the degree of vacuum in soft ground and / or the surface of soft ground under negative pressure through a water pipe and drain material connected to a vacuum pump with a pressure gauge The grasping system was the gist.

[0010] In a third aspect of the present invention, the means for grasping the amount of settlement of the soft ground comprises a measuring water pipe installed on the soft ground, and water is supplied to the measuring water pipe via a connecting pipe. And a water supply storage pipe to be installed in a place where the ground does not fluctuate, which is maintained at the same predetermined water level as the storage water pipe, and the measurement water storage pipe, the settlement of the measurement water storage pipe accompanying the settlement of the soft ground. The gist of the present invention is a system for grasping the dynamics of soft ground, wherein a terminal for measuring a change in the water level or the water pressure of the measuring water storage pipe is installed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a dynamic ground grasping system according to the present invention will be described in detail. This dynamic comprehension system is based on the top load on soft ground, the amount of ground subsidence due to the top load, the amount of condensed water drainage due to the subsidence of the ground,
It is a system that can grasp the dynamics of soft ground accurately and reliably by grasping the temperature of water drained from the ground.

There is a close relationship between the above-mentioned pile load, the amount of land subsidence, and the amount of drainage of consolidation water. That is, the settlement of the soft ground occurs due to the load applied to the soft ground, and the settlement speed of the soft ground changes according to the magnitude of the load.
In addition, there is a relationship between the amount of drainage of condensed water and the amount of subsidence of the ground, that is, "amount of drainage + amount of subsidence = volume of soft ground".
In addition, the measurement of the temperature of the drained water is performed to check whether the water is consolidation water from the ground caused by consolidation dehydration and to grasp an accurate drainage amount.

[0013] As described above, by grasping the upper-layer load, the ground subsidence amount, and the drainage amount of the condensed water, which have a close relationship with each other, the termination of the subsidence which has been judged only based on the conventional subsidence amount of the ground can be further improved. It will be possible to judge accurately and accurately.

As means for grasping the overhead load on the soft ground, for example, as shown in FIG. 1, an airtight sheet 11 covering the surface layer of the soft ground A and a vacuum pump 13 previously installed in the soft ground A are used. The water pipe 12 to be connected and the drain material 14 which is placed at a predetermined interval in the soft ground A and is connected to the water pipe 12 at the upper end thereof, and is installed in the soft ground A and / or on the surface layer of the soft ground A. And a pressure gauge R.

The airtight sheet 11 may be made of a synthetic resin sheet, a sheet obtained by laminating a synthetic resin film on the surface of a fiber base material, or the like.
It is made of a material through which air cannot pass, and covers the soft ground A with this. When the vacuum pump 13 is operated in this state, the negative pressure from the vacuum pump 13 passes through the water collecting tank 15 and is connected to the water pipe. 12 to soft ground A
The surface layer is in a negative pressure state. Furthermore, when the surface layer of the soft ground A is in a negative pressure state, a difference is generated between the surface pressure of the soft ground A and the pore water pressure in the soft ground A, and the pressure difference causes the soft ground A to be formed in the soft ground A by the drain material 14 such as a paper drain material. Water and air are sucked into the soft ground A surface layer through the vertical drainage wall, and drained to the drainage tank 16 through the water pipe 12 and the water collection tank 15 that are in contact with the upper end of the drain material 14. As a result, the inside of the soft ground A is in a negative pressure state, and the degree of vacuum increases.

[0016] The atmospheric pressure acts as a load on the soft ground, which has become substantially vacuum, and is suppressed. The load applied to the soft ground A can be grasped by measuring the degree of vacuum with the pressure gauge R installed in the soft ground A and / or the surface layer of the soft ground A. The pressure gauge R for measuring the degree of vacuum may be either a pressure gauge or a barometer.

As means for grasping the settlement amount of the soft ground, as shown in FIG. 2, a water storage pipe 20 for measurement installed on the soft ground A, and a connecting pipe 21 connected to the water storage pipe 20 for measurement.
And a water supply storage pipe 22 installed at a location where there is no ground fluctuation maintained at the same predetermined water level as that of the measurement water storage pipe 20.

The size and shape of the measuring water storage pipe 20 and the water supply water storage pipe 22 are arbitrary. These tubes 20, 2
The water stored in the storage tank 2 has been subjected to prevention of evaporation and freezing, and the water supply storage pipe 22 has a measurement storage pipe 20.
Water is supplied from a water storage tank 24 by a pump (not shown) so that the water level becomes the same as the water level, and excess water overflows from a return port 23 formed in the water supply water storage pipe 22 and is discharged from the water storage tank 24. Is to be returned to. In addition, a water level measuring terminal or a water pressure measuring terminal T is installed in the measuring water storage pipe 20.

Then, when the measuring water storage pipe 20 subsides as the soft ground A subsides, water is supplied from the water supply water storage pipe 22 via the connecting pipe 21 so that the water level is the same. As a result, the water level (hydraulic pressure) of the measuring water storage pipe 20 rises. By measuring this with the water level measuring terminal or the hydraulic pressure measuring terminal T, the amount of settlement can be measured.

According to the means for grasping the amount of settlement of the soft ground, the amount of rise of the soft ground can be measured and grasped. That is, when the soft ground A rises, the measuring water storage pipe 20 also rises accordingly. When the measuring water storage pipe 20 rises, water is returned to the water supply water storing pipe 22 via the connecting pipe 21 so that the water level is the same. As a result, the water level (hydraulic pressure) of the measuring water storage pipe 20 decreases. By measuring this with the water level measuring terminal or the hydraulic pressure measuring terminal T, the amount of rise of the ground can be measured and grasped. .

As described above, the amount of drainage of the condensed water accompanying the settlement of the ground is determined by sucking the water into the surface of the soft ground A through the vertical drain wall formed in the soft ground A by the drain material 14 such as the paper drain material. Out, drain material 1
4 The amount of consolidation water in the soft ground A drained to the drainage tank 16 through the water pipe 12 and the water collection tank 15 in contact with the upper end may be measured, and the water amount measuring means is arbitrary.

The purpose of grasping the temperature of the water discharged from the ground is to confirm whether or not the water is condensed water, whereby the amount of discharged water can be accurately grasped. Confirmation of condensed water is based on the temperature difference between condensed water and surface water.

The measurement and grasp of the data of the pile load, the amount of subsidence of the ground, the amount of drainage of the condensed water, and the temperature of the condensed water by the dynamic ground grasping system of the present invention can be performed in real time. It can also be performed every predetermined time or every predetermined period.

In addition, the data of the pile load, the amount of subsidence of the ground, the amount of drainage of the condensed water, the temperature of the condensed water and the temperature of the condensed water are measured and grasped by the system for grasping the dynamics of the soft ground according to the present invention. They can be used together. In this case, the dynamics of the soft ground can be grasped with higher accuracy, which is preferable.

[0025]

According to the system for grasping dynamics of soft ground according to the first aspect of the present invention, data having an intimate relationship among the pile load, ground subsidence, consolidation water drainage, and consolidation water temperature are measured. Then, by grasping, the termination of settlement, which has been determined only by the conventional amount of settlement of the ground, can be more accurately and accurately determined. Further according to this system,
Since the strength of soft ground and the measurement accuracy of residual settlement are dramatically improved, it is possible to determine not only the timing of installation of structures and embankments, but also the form of structures and embankments, the processing method of foundation ground,
It is also possible to plan countermeasures for sloped houses.

According to a second aspect of the present invention, there is provided a system for grasping dynamics of a soft ground, an airtight sheet covering a surface of the soft ground, a water pipe connected to a vacuum pump previously installed on the surface of the soft ground, Drain material is installed at a predetermined interval to the upper end of the drainage pipe connected to the water pipe, and a pressure gauge is installed in the soft ground and or on the soft ground surface layer,
For a soft ground covered with the airtight sheet and placed in a negative pressure state through a water pipe and a drain material connected to a vacuum pump and / or a soft ground in which the degree of vacuum of the soft ground surface layer is measured by a pressure gauge. The use of the pile load grasping means makes it possible to measure and grasp the pile load on the soft ground with higher accuracy.

According to a third aspect of the present invention, there is provided a system for grasping dynamics of a soft ground, wherein a water storage pipe is provided on the soft ground A, and water is supplied to the water storage pipe via a connecting pipe. And a water supply storage pipe to be installed in a place where the ground does not fluctuate, which is held at the same predetermined water level as the water storage pipe, and the measurement water storage pipe is caused by the settlement of the measurement water storage pipe accompanying the settlement of the soft ground. Since the means for grasping the amount of subsidence of the ground due to the overburden load in which a terminal for measuring the change in the water level or water pressure of the measuring water storage pipe is adopted, the subsidence amount is measured and grasped with higher accuracy. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an upper layer load grasping means for a soft ground in the soft ground dynamics grasping system of the present invention.

FIG. 2 is a schematic diagram showing means for grasping the amount of settlement of soft ground in the system for grasping dynamics of soft ground according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Airtight sheet 12 ... Water pipe 13 ... Vacuum pump 14 ... Drain material 20 ... Measuring water storage pipe 22 ... Water supply water storage pipe R ... Pressure gauge T ... A terminal for measuring the change in water level or water pressure of the measuring water storage pipe A A: Soft ground

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 1/00

Claims (3)

(57) [Claims] A means for ascertaining an overburden load on soft ground, a means for ascertaining the amount of ground subsidence due to the overburden load,
A system for grasping the dynamics of soft ground, comprising: means for grasping the amount of condensed water drained due to land subsidence, and means for grasping the temperature of water discharged from the ground. 2. An airtight sheet covering a surface layer of the soft ground, a water pipe connected to a vacuum pump previously installed on the surface layer of the soft ground,
Drain material which is cast at a predetermined interval in the soft ground and has an upper end connected to the water pipe, and a pressure gauge installed in the soft ground and / or on the soft ground surface layer, and is covered with the airtight sheet. 2. A vacuum gauge for measuring the degree of vacuum in the soft ground and / or the surface of the soft ground placed in a negative pressure state through a water pipe and a drain material connected to a vacuum pump, using a pressure gauge. Dynamic soil dynamics grasp system. 3. The submerged amount grasping means of the soft ground includes a measuring water storage pipe installed on the soft ground and water supplied to the measuring water pipe through a connecting pipe, and is the same as the measuring water pipe. A water supply storage pipe to be installed in a place where the ground does not fluctuate, which is held at a predetermined water level, and the measurement water storage pipe due to the sinking of the measurement water storage pipe caused by the subsidence of the soft ground. The dynamic ground grasp system according to claim 1, further comprising a terminal for measuring a change in water level or water pressure of the pipe.