KR20130000681A - Apparatus and method for measuring multi-layer underground settlement - Google Patents

Abstract

PURPOSE: A device and a method for measuring the underground subsidence of each layer are provided to minimize artificial errors and measurement errors by automatically measuring or monitoring and to measure an occurrence pattern and the accumulation of the subsidence by continuously monitoring. CONSTITUTION: A device for measuring the underground subsidence of each layer comprises anchors(10-1,10-2,10-3), a non-flexible connection materials, behavior guide pipes(12-1,12-2,12-3), load cells(20-1,20-2,20-3), and a data logger(30). The anchors are inserted into a subsidence measuring hole(1) at different depths based on a ground surface and fixed on the ambient ground of the subsidence measuring hole with a fixing member at different heights. The non-flexible connection material is connected to the each anchor. The behavior guide pipes protect the non-flexible connection material so that the non-flexible connection material is moved by the anchor. The load cell is installed on the ground and connected to the non-flexible connection material, thereby detecting tensile force respectively applied to the non-flexible connection material from the anchors. The data logger converts data measured by the load cells into display displacement or subsidence displacement. The subsidence of each layer is measured base on the tensile force applied to the load cell through the non-flexible connection material in the subsidence of the anchors.

Description

Floor subsidence measurement apparatus and method {APPARATUS AND METHOD FOR MEASURING MULTI-LAYER UNDERGROUND SETTLEMENT}

The present invention relates to a floor subsidence measurement apparatus and method, and more particularly, to provide a reliable measurement value of the subsurface subsidence quantitatively, continuously and simply, and at the same time the floor subsidence measurement device to enable remote automatic measurement And to a method.

The application and application range of settlement measurement is displacement measurement due to settlement or elevation of foundation ground, displacement measurement of retaining walls and bridges, displacement measurement of embankment and force dam, and displacement measurement of soft ground.

In general, the settlement measurement method used a method of drilling a drilling hole into the ground, placing a magnetic force device in each excavation hole, and measuring the settlement amount with a vernier caliper or a conventional instrument by manual operation. .

In this case, it is cumbersome to measure the relative settlement between the initial value and the measured value by manual measurement using a vernier caliper or conventional instrument, and it is difficult to trust the measured value due to the operator's measurement error.

On the other hand, other conventional layered sedimentation system according to the prior art to form a hole in the ground, and then insert a reference rod equipped with a plurality of layered sedimentation system into the hole so that the lower end of the reference rod (usually equipped with a press-fitted steel pipe) is supported on the support layer. Afterwards, the settlement of the depth at which the floor-based settlement is located is measured. After the floor settling system is inserted into the perforation, it becomes active in the surrounding ground. In this state, the floor settling system moves with the surrounding ground, and measures the depth of settlement of the corresponding depth by measuring the movement of the floor settling system with respect to the reference rod. You can do it. This is because the driving equipment must be configured so that the sinking system is slid in the ground, there is a problem that the drive equipment is buried in the ground is not possible to reuse, such as an electric element is buried in the ground.

The present invention is to solve the problems as described above, to make it possible to easily obtain a reliable measurement value and continuous change of the underground settlement, and to allow remote automatic measurement, and to reuse expensive load cells, etc. An object of the present invention is to provide a device and a method for measuring underground subsidence.

Ground level settlement measurement device for each floor according to the present invention for achieving the object as described above, is inserted into different depths when the ground surface to the settlement measurement hole formed in the ground and the ground around the settlement measurement hole through the fixing means A plurality of anchors fixed at different heights on the anchor; An inelastic connecting member connected to each of the plurality of anchors; A long inner tube protecting the non-stretchable connector to behave by the anchor; A plurality of load cells installed on the ground and connected to the non-stretchable connector to detect tensile force applied to the non-stretchable connector from the anchor; And a data logger converting the data measured by the load cell into a display and settlement displacement, and measuring the layer-based settlement based on the tensile force applied to the load cell through the non-stretchable connector upon settlement of the anchor. do.

According to the present invention, there is provided a method for measuring underground settlement by floors, comprising: a first step of drilling a settlement measurement hole at a predetermined depth in the ground; A second step of inserting and installing a plurality of anchors at different depths in the settlement measuring hole formed through the first step, and installing a plurality of load cells to be connected to the anchor via a non-stretchable connection material on the ground; A third step of synthesizing the anchor integrally with the ground after fixing the anchor to the ground around the settlement measuring hole; And a fourth step of detecting the tensile force applied to each of the load cells through the anchor and converting the displacement into settlement displacement based on the tensile force.

According to the ground level settlement measurement device and method according to the present invention, it is possible to minimize the artificial error and measurement error that can occur in the existing measurement method through automatic measurement and monitoring, and to generate the settlement of continuous data measurement through continuous monitoring The pattern and cumulative amount can be measured.

In addition, when the load cell is installed on the ground and does not require settlement measurement, the load cell can be dismantled and reused, and only the inexpensive anchors and connecting materials are embedded, and the anchor is fixed without driving equipment, thereby greatly reducing the cost.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram of the layered underground settlement measurement apparatus by this invention.
2 is a view showing an example of operation by the floor ground subsidence measuring apparatus according to the present invention.
3 is a graph showing a load-strain curve as a result of a wire-rope tensile test.
4 is a standard curve graph for load-strain curves measured as a result of 5m, 10m, and 15m non-stretch wire-rope tensile tests.

As shown in FIG. 1, the floor-based underground settlement measuring apparatus according to the present invention includes first to third anchors 10-1, 10-2, and 10-3 inserted into the ground in multiple stages (different heights) ( In the drawing, three are shown as an example), and the first to third anchors 10-1, 10-2, and 10-3 generate the tensile force by subsidence of the ground and receive the tensile force and detect the first to third ones. By converting the tensile force detected by the third load cell (20-1, 20-2, 20-3), the first to third load cells (20-1, 20-2, 20-3) and this tensile force to displacement It consists of a data logger 30 to be displayed, the first to third anchors (10-1, 10-2, 10-3) are settled together by the settlement of the ground corresponding (same depth (layer)) Tensile force is applied to the first to third load cells 20-1, 20-2, and 20-3, respectively, and the displacement of the layered settlement is calculated based on the tensile force detected at this time.

The first to third anchors 10-1, 10-2, and 10-3 are installed at different depths in the settlement measuring hole 1 bored in the ground to measure the settlement of each layer of the ground, which is described later. Is determined by the length of (11-1,11-2,11-3).

In the present invention, the first to third anchors 10-1, 10-2, and 10-3 should be settled together with the ground, that is, the first to third anchors 10-1, 10-2, and 10-3. Must be fixed to the ground of the same depth (layer) independently, and fillers (such as concrete) were applied. When the filling material 40 is poured and cured inside the settlement measuring hole 1, the first to third anchors 10-1, 10-2, and 10-3 are synthesized integrally with the ground through the filling material 40 to be grounded. It sinks with the ground. That is, in the present invention, the filler 40 does not perform a function of reinforcing the ground, but instead of fixing the first to third anchors 10-1, 10-2, 10-3 to the ground and cracking the ground. The first to third anchors (10-1, 10-2, 10-3) is to induce to sink with the ground.

Accordingly, the first to third anchors 10-1, 10-2, and 10-3 may be fixed in a manner other than the filler 40, for example, fixed to the ground around the settlement measuring hole 1. It may be anchored through means. The fixing means is a spike formed to be anchored in the ground formed radially in the anchor fixing portion and the circumference of the anchor fixing portion to which the first to third anchors (10-1, 10-2, 10-3) are fixed, respectively. Can be configured.

The first to third anchors 10-1, 10-2, and 10-3 may have any structure capable of performing the above functions, and may be ready-made.

The first to third load cells 20-1, 20-2, and 20-3 are independently connected to the first to third anchors 10-1, 10-2, and 10-3, respectively. The tensile force generated by the settlement of the anchors 10-1, 10-2, 10-3 is detected, respectively.

The first to third load cells 20-1, 20-2, and 20-3 are installed on the ground through the load cell plate 50.

The load cell plate 50 includes a plate-shaped mounting part 51 on which the first to third load cells 20-1, 20-2, and 20-3 may be mounted.

In addition, in order to protect the first to third load cells 20-1, 20-2, and 20-3 mounted on the mounting unit 51, the mounting unit 51 includes a cover 52 covering the mounting unit 51. It can be installed to open and close. In addition, when the ground is soft, collapse may occur during the filling process of the filler 40 from the drilling of the settlement measuring hole 1, and a casing may be installed in the settlement measuring hole 1 to prevent this. The casing 53 may be a single piece, but may be integrally formed at the bottom of the mounting portion 51 of the load cell plate 50 to facilitate handling (storage, transportation, construction, etc.).

The first to third anchors 10-1, 10-2, 10-3 and the first to third load cells 20-1, 20-2, and 20-3 are non-stretchable connectors, for example, the first to third It is connected by three steel wires (11-1, 11-2, 11-3). The stretchable connecting member has a tensile force caused by the settlement of the first to third anchors 10-1, 10-2, and 10-3 by its own stretching to the first to third load cells 20-1, 20-2, and 20-3. Cannot be transferred to). In other words, the non-stretchable connecting member is not limited to the steel wire, everything that can perform the above-described function is possible.

At this time, the first to third steel wires (11-1, 11-2, 11-3) interfere with the filling filler 40 of the first to third anchors (10-1, 10-2, 10-3). The inner tube 12-1, 12-2, 12-3 is inserted into the inner tube 12-1, 12-2, and 12-3 during the first to third periods so that they can be tensioned. The first to third steel inner tubes 12-1, 12-2, and 12-3 have first to third steel wires 11-1, 11-2, and 11-3 to the first to third anchors 10. It is made of a diameter that can be tensioned by the settlement of -1,10-2,10-3, provided that the filler 40 is sealed or formed to an appropriate diameter so as not to flow.

The first to third inner tube 12-1, 12-2, 12-3 is preferably destroyed during the settlement of the filling material 40, for example, a plurality of unit pipes are connected through a coupler The unit tube may be configured to be separated from the coupler when the filler 40 is settled.

The connection structure between the first to third load cells 20-1, 20-2, and 20-3 and the first to third steel wires 11-1, 11-2, and 11-3 is a first to third load cell. Any structure in which a tensile force can be transmitted to (20-1,20-2,20-3) is possible, provided that the first to third load cells 20-1,20-2,20-3 are first It is preferable to be connected to be separated from the third steel wire (11-1,11-2,11-3).

When the first to third anchors 10-1, 10-2, and 10-3 are settled, the first to third load cells 20-1, 20-2, and 20-3 should not be settled but must maintain the installation position. To this end, the slab 60 may be built on the ground surface. The slab 60 is made of concrete and can be formed in various forms such as site casting, precast block, and the rod plate 50 is fixed to the upper surface.

The data logger 30 is electrically connected to the first to third load cells 20-1, 20-2, and 20-3, and the first to third load cells 20-1, 20-2, and 20-3. The tensile force measured at each can be displayed, and this tensile force can be converted and displayed as the settlement displacement amount.

The data logger 30 is representative of a monitoring system, and data transmission is performed through an internet network or a CDMA type modem so as to enable remote monitoring and control at a distance from a settlement measurement site.

The ground level settlement measurement method according to the present invention is as follows.

(S10) Settlement hole perforation.

Drill the settlement measuring hole 1 in the ground using equipment such as Auger.

(S20) Settlement measurement device.

The settlement measurement device according to the present invention is provided in the settlement measurement hole 1.

The first to third anchors 10-1, 10-2, and 10-3 are installed in the settlement measuring hole 1. The first to third anchors 10-1, 10-2, and 10-3 are installed at different depths through the first to third steel wires 11-1, 11-2, and 11-3. For example, the first anchor 10-1 is 5 m, the second anchor 10-2 is 10 m, and the third anchor 10-3 is provided to a depth of 15 m.

The load cell plate 50 is installed on the ground surface (installed on the slab 60 when the slab 60 is applied), and the first to third load cells 20-1, 20-2, and 20-3 are loaded on the load cell plate 50. ) And the first to third anchors 10-1, 10-2, and 10-3, and are electrically connected to the data logger 30. When installing the first to third load cells (20-1, 20-2, 20-3) should be installed to enable the filling of the filler 40, which is a subsequent process.

(S30) Fill the settlement instrument.

The filling material 40 is placed inside the settlement measuring hole 1 to wait for curing.

The filler 40 seals the settlement measuring hole 1 and fixes the first to third anchors 10-1, 10-2, and 10-3.

(S40) Settlement measurement.

In the initial state in which the first to third anchors 10-1, 10-2, and 10-3 are installed, no tensile force is applied to the first to third load cells 20-1, 20-2, and 20-3.

The data logger 30 receives and stores the tensile force in real time from the first to third load cells 20-1, 20-2, and 20-3.

In this state, for example, as shown in FIG. 2, when settlement occurs in the ground around the third anchor 10-3 (called third ground layer A), the third ground layer A is settled by settlement. Anchor 10-3 is the third filling layer (40-3) of the filler 40 (where the section of the third layer (A) and the third filling layer (40-3) is to help understand) and Settle together.

When the third anchor 10-3 is settled, the third steel wire 11-3 is tensioned, and thus, a tensile force is applied to the third load cell 20-3 through the third steel wire 10-3.

The data logger 30 converts the tensile force measured by the third load cell 20-3 into settlement displacement and displays it. The first and second anchors 10-1 and 10-2 will not be settled if the ground other than the third strata A is not settled, so that the manager in the remote control station can display information displayed through the data logger 30. It can be confirmed that the settlement occurred in which strata.

As described above, even when the ground corresponding to the depth of the first anchor 10-1 and the second anchor 10-2 is settled, the measurement can be performed. Therefore, the ground-based settlement of the ground can be measured and confirmed.

3 is a graph showing a load-strain curve as a result of a non-elastic connector (wire-rope) tensile test. When the length of the non-elastic connector is changed, the difference in load and displacement measured by the degree of tension of the non-elastic connector is different. appear. For a more accurate comparison, the load-displacement curve is converted into a load-strain curve, and a graph is shown. The measured load-strain curve is shown in FIG. 3.

FIG. 5 is a standard curve for load-strain curves measured as a result of 5m, 10m, and 15m non-stretch wire-rope tensile tests.

Polynomial Equation

- 0.0004575143943

+ 2.839682655E-006

- 5.849029844E-009

Y = 0.05673644772 + 0.06584865316

-0.0004575143943

+ 2.839682655E-006

-5.849029844E-009

)를 이용하여 하중에 따른 침하량(지반변위:

)을 하기의 식을 통해 계산할 수 있다. That is, the displacement amount (strain: ε) measured from the measured load (kg) of the measurement system installed in the field using the standard curve and the installed wire-rope length information (depth of installation :

Settlement according to the load ()

) Can be calculated by the following equation.

Ground displacement (Δℓ) = displacement (ε) ㅧ depth of installation (ℓ),

Displacement (ε) = Ground Displacement (Δℓ) / Installation Depth (ℓ)

If the wire-rope installed at the site uses a different one from the one used in this experiment, the displacement according to the settlement can be calculated using the above empirical formula through the tensile test of the used wire-rope.

1: settlement meter,
10-1,10-2,10-3: first to third anchors
20-1,20-2,20-3: first to third load cells
30: data logger, 40: filler
50: load cell plate, 60: slab

Claims (6)

A plurality of anchors (10-1, 10-) inserted into different depths based on the ground surface in the settlement measuring hole (1) formed in the ground and fixed at different heights to the ground around the settlement measuring hole through fixing means 2,10-3);
An inelastic connecting member connected to each of the plurality of anchors;
A long inner tube protecting the non-stretchable connector to behave by the anchor;
A plurality of load cells (20-1,20-2,20-3) installed on the ground and connected to the non-stretchable connector to detect tensile force applied from the anchor to the non-stretchable connector, respectively;
Including the data logger 30 for converting the data measured by the load cell to the display and settlement displacement, to measure the layer-based settlement based on the tensile force applied to the load cell through the non-elastic coupling member when the anchoring Floor underground settlement measurement device characterized in that. The method according to claim 1, wherein the fixing means is a ground subsidence measuring device that is the filling material (40) to be cured in the interior of the settlement measuring hole. The load cell plate of claim 1 or 2, further comprising a load cell plate supported on the ground and on which the load cell is mounted, wherein the load cell plate extends at a bottom of the load cell mount unit 51 and the bottom of the load cell mount unit on which the load cell is mounted. Floor underground settlement measurement device comprising a casing (53) inserted into a measurement hole to protect the settlement measurement hole. 4. The underground settlement measurement system for floors according to claim 3, further comprising a slab (60) formed on the ground surface and supporting the load cell plate. A first step of drilling the settlement measuring hole 1 to a predetermined depth in the ground;
Insert and install a plurality of anchors (10-1, 10-2, 10-3) at different depths in the settlement measuring hole formed through the first step, so as to be connected to the anchor via a non-stretchable connection on the ground A second step of installing a plurality of load cells 20-1, 20-2, and 20-3;
A third step of synthesizing the anchor integrally with the ground after fixing the anchor to the ground around the settlement measuring hole;
And a fourth step of detecting the tensile force applied to the load cell through the anchor and converting the tensile force into settlement displacement. The method of claim 5, wherein in the fourth step,
Ground displacement (Δℓ) = displacement (ε) ㅧ depth of installation (ℓ)
The ground subsidence measurement method, characterized in that to convert the tensile force into settlement ground displacement through the above formula.

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