JP6468969B2 - Verification method and verification equipment for underground wall construction - Google Patents

Description

  The present invention relates to a verification method for confirming that the construction of an underground wall is properly constructed, and a verification device used therefor.

In creating the underground wall, the applicant should first create the underground wall in order to suppress cutting and improving areas that do not need to be cut or improved for the purpose of creating the underground wall. Drill a boring hole to the area, insert an injection device into the drilled boring hole, inject the jet containing the improvement material from the injection device rotating in the same direction, cut the in-situ soil, The in-situ soil is mixed and agitated to improve the region where the underground wall is to be created. In the case of the improvement, the improvement material is included when the longitudinal region of the underground wall to be created is improved. When the jet cutting distance is increased to improve the region in the direction perpendicular to the underground wall to be created, the jet cutting distance including the improvement material is shortened, so that one section of the underground wall is An underground wall that can form an underground solid body with a roughly rectangular cross section It proposed a growth method (see Patent Document 1).
In such a technique (Patent Document 1), when improving the longitudinal direction region of the underground wall to be created, the rotational speed of the injection device is decreased to improve the region perpendicular to the underground wall to be created. When doing so, the rotational speed of the injection device is increased.

The above-described conventional technique (Patent Document 1) is a very useful technique, but an injection device is provided in order to create an underground solid body having a substantially rectangular cross section, which is a section of the underground wall. When the rod is rotated (improved), it is necessary to change the rotation speed at a predetermined position (a position where the central angle with respect to the center of the boring hole into which the cutting device is inserted is a predetermined angle). If the position (circumferential direction position, center angle, or rotation speed switching timing) for changing the rotation speed of the injection device is not accurate, a submerged solid unit with a rectangular cross section, which is a section of the underground wall, is created. I can't do it. If an underground solid body having a substantially rectangular cross section cannot be formed, the area that does not need to be cut or improved for underground wall formation will be cut and improved, and This is because the required width dimension cannot be secured.
Therefore, in order to create an underground solid body having a substantially rectangular cross section, which is a section of the underground wall, according to the above-described prior art (Patent Document 1), the rotational speed (or angular velocity) of the injection device is required prior to the creation. Must be switched accurately at a predetermined position (circumferential position, center angle, or rotational speed switching timing). And it is desirable that such confirmation is performed visually.
However, no verification technique that enables such confirmation (particularly visual confirmation) has been proposed.

JP 2012-97550 A

  The present invention has been proposed in view of the above-mentioned problems of the prior art, and when the underground wall is constructed, the rotational speed (or angular speed) of the injection device is a predetermined position (circumferential position, central angle, or rotational speed). It is an object of the present invention to provide an underground wall creation verification method that can visually confirm that the switching has been performed accurately at the speed switching timing, and an underground wall creation verification device used therefor.

The underground wall construction verification method of the present invention includes a rotating plate (1), a sensor (2: for example, a proximity switch), and the like, prior to connecting the injection device to a rotational drive source (20: including, for example, a spindle). Connecting the rotating shaft (4) of the test device (10, 11) having a display device (3: light emitting device such as a display lamp),
On the rotating plate (1) of the verification device (10, 11), circumferential position display means (1A: symbol such as an arrow) corresponding to the position of the injection nozzle of the injection device is displayed. The sensor (2) of (10, 11) indicates that the circumferential position display means (1A: for example, an arrow, etc.) of the rotating plate (1) has reached a predetermined circumferential position (P1, P2, P3, etc.). It is configured to detect and transmit the information to the display device (3) (has a function), and the display device (3) has the circumferential position display means (1A: for example, an arrow). It is configured to display that it has reached a predetermined position in the circumferential direction (P1, P2, P3, etc.) from the sensor (2) (for example, if it is a display lamp, it emits light). (Having a function), the predetermined position (P , P2, P3, etc., ...) is the same as the position to switch the rotational speed of the injection device (angular velocity),
The rotary drive source (20) is actuated to rotate the rotating plate (1) of the verification device (10, 11), and the circumferential position display means (1A: symbol such as an arrow) is the predetermined position. A step of visually recognizing that the rotational speed (angular speed) of the rotating plate (1) (or the rotating shaft 4) changes when reaching (P1, P2, P3, etc.);
After the step of visual recognition, the rotation drive source (20) is stopped, the rotation shaft (4) of the test device (10, 11) is removed from the rotation drive source (20), and the injection device is turned into the rotation drive source (20). Connecting to,
It is characterized by having.

The underground wall construction verification method of the present invention is a step of detecting the rotation angle (for example, θ101, θ102, θ103, etc.) and the rotation angular velocity (for example, v101, v102, v103) of the rotating plate (1) (for example, to the encoder 6). And a step of determining and displaying the characteristics of the detected rotation angle and rotation angular velocity of the rotating plate (1) and a step of determining based on the displayed characteristics of the rotation angle and rotation angular velocity of the rotating plate (1). It is preferable to have it.
And the underground wall construction verification method of the present invention is a method of drilling a boring hole up to an area where the underground wall is to be constructed, inserting an injection device into the drilled borehole, and rotating from the injection device rotating in the same direction. A jet containing the improvement material is jetted to cut the in-situ soil, and the improvement material and the in-situ soil are mixed, and the region where the underground wall is to be formed is improved by stirring, and the improvement is made at the time of the improvement. When improving the longitudinal region of the underground wall, the cutting distance of the jet containing the improving material should be increased, and when improving the region perpendicular to the underground wall to be created, the improving material should be used. It is preferably performed prior to the execution of the underground wall construction method for shortening the cutting distance of the included jet.

In the underground wall construction method carried out after the underground wall construction verification method of the present invention, when improving the longitudinal region of the underground wall to be constructed, the rotational speed of the injection device is slowed to create the underground wall. When improving the region in the direction orthogonal to the underground wall to be made, the rotation speed of the injection device is increased, and the rotation speed of the injection device is changed to three types during the half rotation of the injection device (switching of the rotation speed is 4). Preferably).
Here, it is preferable that the mechanism for rotating the injection device used in the underground wall construction method implemented after the underground wall construction verification method of the present invention is driven by an electric motor (for example, an electric motor).

The underground wall creation verification device (10, 11) according to the present invention is used in the underground wall creation verification method (the underground wall creation verification method according to any one of claims 1 to 3). In the wall building verification device,
A rotating plate (1), a sensor (2: for example, a proximity switch), a display device (3: for example, a light emitting device such as a display lamp), and a rotating shaft (4);
The rotating shaft (4) is configured to be detachable from a rotation driving source (20) of the injection device,
Circumferential position display means (1A: symbol such as an arrow) corresponding to the position of the injection nozzle of the injection device is displayed on the rotating plate (1) of the verification device (10, 11),
The sensor (2) of the verification device (10, 11) is such that the circumferential position display means (1A, for example, an arrow) of the rotating plate (1) reaches a predetermined circumferential position (P1, P2, P3, etc.). A function of detecting the detection (function of detecting that the detected part 2A is close) and a function of transmitting the detection to the display device (3),
The display device (3) displays when the circumferential position display means (1A: for example, an arrow etc.) has reached a predetermined circumferential position (P1, P2, P3, etc.) from the sensor (2). (For example, if the display lamp emits light)
The predetermined positions (P1, P2, P3, etc.) in the circumferential direction are the same as the positions at which the rotation speed (angular speed) of the injection device should be switched.

  In the underground wall construction verification device (10, 11) of the present invention, a detection device for detecting the rotation angle (for example, θ101, θ102, θ103, etc.) and the rotation angular velocity (for example, v101, v102, v103) of the rotating plate (1). (6: For example, an encoder) and a display device (30) for determining and displaying characteristics of the detected rotation angle and rotation angular velocity of the rotating plate (1) are preferably provided.

Moreover, in the underground wall construction test | inspection apparatus (10, 11) of this invention, it is preferable that the said sensor (2) is provided in the circumferential direction several position.
In this specification, the term “test” does not mean “measurement”. It has implications regarding “whether or not (construction) can be permitted”.

  According to the verification method and the verification apparatus (10, 11) of the present invention having the above-described configuration, the injection device is connected to the rotary drive source (20), and the injection device is rotated while the section of the underground wall is rotated. By conducting a test prior to creating a submerged rectangular solid body, it is possible to create a subsurface solid rectangular solid section, which is a section of the underground wall, by rotating the spraying device. It can be visually confirmed beforehand.

That is, prior to the construction of the underground wall, the verification device (10, 11) of the present invention is attached to the rotational drive source (20), and the rotational plate (1) of the verification device (10, 11) by the rotational drive source (20). ), The circumferential position display means (1A, for example, a symbol such as an arrow) corresponding to the position of the injection nozzle of the injection device also rotates. Then, when the circumferential position display means (1A) reaches the position (P1, P2, P3, etc .: predetermined position) at which the rotation speed (angular speed) of the injection device should be switched (when the detected part 2A is close to the sensor 2). That is detected by the sensor (2) of the verification device (10, 11), and the display device (3) displays (the circumferential position display means 1A has reached the predetermined positions P1, P2, P3, etc.) (For example, the display lamp emits light).
The rotary drive source (20) is configured to form an underground solid body having a substantially rectangular cross section, which is a section of the underground wall, by the injection device, so that the predetermined position (P1, P2, P3, etc .: rotation speed of the injection device ( Since it has a function of changing the rotational speed (angular speed) when it comes to the position where the angular speed) is to be switched, the rotating plate (1) is displayed simultaneously with the display by the display device (3) (for example, light emission of the display lamp). Rotational speed (angular speed) of changes.

If an operator connects the injection device to the rotation source (20) by observing the change in the rotation speed (angular velocity) of the rotating plate (1), the operator moves the injection device at a predetermined position (P1, P2, P3, etc.). The rotational speed (angular speed) can be switched, so that it is possible to visually confirm that an underground solid body having a substantially rectangular cross section, which is a section of the underground wall, can be formed.
In other words, according to the present invention, it is simulated that the rotational speed (angular speed) of the injection device “changes the angular speed at a desired angle (position corresponding to the center angle)” in the previous stage of underground wall creation. It is possible. Those skilled in the art can easily understand that such simulation is very important in the construction of the underground wall construction method.
In addition, in the present invention, the rotation angle (for example, θ101, θ102, θ103, etc.) and the rotation angular velocity (for example, v101, v102, v103) of the rotation plate (1) are detected (for example, the encoder 6), and the detected rotation plate is detected. If the characteristics of the rotational angle and rotational angular velocity of (1) are determined and displayed and judged based on the characteristics of the displayed rotational angle and rotational angular velocity of the rotating plate (1), the desired thickness (minimum thickness t ) And length (the length in the left-right direction of one section in FIGS. 6A to 6D), whether or not an underground solid body having a substantially rectangular cross section can be created before construction. Can be checked or calibrated.

In the test apparatus (10, 11) used in the present invention, if the sensor (2) is provided at a plurality of positions in the circumferential direction, the rotational speed (angular speed) is determined in a plurality of stages (for example, three stages in half rotation). Even if it fluctuates, it detects that the circumferential position display means (1A: symbol such as an arrow) has reached each time and displays it on the display device (3) (for example, emission of a display lamp). I can do it.
In addition, even if there are a plurality of types of underground wall thicknesses (minimum thickness t: corresponding to a predetermined center angle), it is possible to cope with them. If the center angle (for example, the angle θ in FIG. 3 and the angle θ101 in FIG. 6A) corresponding to the position of the sensor is large, the underground wall minimum thickness (t) is increased.
On the other hand, if the central angle θ corresponding to the position of the sensor (for example, the angle θ in FIG. 3 or the angle θ101 in FIG. 6A) is small, the underground wall minimum thickness (t) becomes thin.

It is explanatory drawing which shows the outline | summary of the test | inspection apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the function of the test | inspection apparatus which concerns on embodiment. It is explanatory drawing which shows the function of the modification of the test | inspection apparatus which concerns on embodiment. It is a flowchart which shows the outline | summary of the construction procedure of embodiment. It is a characteristic view for demonstrating the necessity of a test | inspection. It is explanatory drawing explaining the construction procedure which produces | generates the underground solid body of a cross-section outline rectangle.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, in order to facilitate understanding of the illustrated embodiment, a method for creating an underground wall having a substantially rectangular planar shape disclosed in Japanese Patent Application Laid-Open No. 2012-97550 will be briefly described below.
As shown in FIG. 6, in order to create an underground wall having a substantially rectangular planar shape, construction is performed by injecting two jets in a straight line from the injection device 100 into the ground in opposite directions. Is done. The construction is performed in the order of steps (a), (b), (c), (d), and (e).

In the step (a), two (a pair of) jets are jetted in the substantially longitudinal direction of the continuous wall W (see the step (e)) to be formed from the spray device 100, and fan-shaped regions 101 and 101A (shown by hatching). The ground in the area) is cut and mixed with the solidified material to improve. The center angle of the regions 101 and 101A is indicated by the reference sign θ101. In the step (a), the cutting distance (reaching distance) of the jet is the longest, the rotation angular velocity of the injection device 100 is indicated by the arrow v101, and the rotation direction is as indicated by the arrow v101.
In FIG. 6, the symbol t indicates the thickness (necessary thickness) required for the continuous wall to be created.
In the step (b), the fan-shaped regions 102 and 102A (regions indicated by hatching) are improved by the jet as the rotational angular velocity v102 of the injection device 100. In step (b), the central angle of the region 102 to be improved is indicated by the symbol θ102.

In the step (c), the fan-shaped regions 103 and 103A (regions indicated by hatching) in a direction orthogonal to the substantially longitudinal direction of the continuous wall W to be formed are improved by a jet. In step (c), the cutting distance (reaching distance) of the jet is the shortest, and the rotational angular velocity of the injection device 100 is v103. The central angle of the region 103 is indicated by reference sign θ103.
In the step (d), fan-shaped regions 104 and 104A (regions indicated by hatching) between the regions 103 and 103A improved in the step (c) and the regions 101A and 101 improved in the step (a) by a jet. Make improvements. The rotational angular velocity of the injection device 100 in step (d) is v102, which is the same as in step (b). The central angle of the region 104 is θ102, which is the same as the central angle of the region 102 improved in the step (b).

In FIG. 6, the rotational speed (angular speed v) of the injection device 100 is increased or decreased to adjust the cutting distance (reach distance) of the jet, and the jet flow is reduced by reducing the rotational speed (angular speed v) of the injection device 100. The cutting distance (reach distance) is increased. And the cutting distance (reaching distance) of a jet is shortened by making the rotational speed (angular velocity v) of the injection device 100 faster.
The three types of rotational angular velocities, the rotational angular velocity v101 in step (a) in FIG. 6, the rotational angular velocity v102 in steps (b) and (d), and the rotational angular velocity v103 in step (c) are:
The relationship is v101 <v102 <v103.

When the improvement of the regions 101, 101A, 102, 102A, 103, 103A, 104, 104A is completed by the steps (a) to (d), the injection device 100 is raised by a predetermined depth, and the steps (a) to ( d) is repeated, and the ground is improved as a planar columnar solid as shown in FIG. 6E for a predetermined region in the depth direction (region K1).
Next, steps (a) to (d) are repeated for other portions of the continuous wall W to be formed (for example, the regions K2 and K3 in FIG. 6E), and the improved region is set in the vertical direction. Stretch.
In this way, a continuous underground wall W can be created.

In order to improve the region where the planar shape is substantially rectangular as shown in FIGS. 6D and 6E, in steps (a) to (d), at a predetermined position (center angle θ of the injection device 100). The rotational angular velocity v of the injection device 100 is switched.
Specifically, in the step (a) of FIG. 6, the jet direction of the jet flow from the jet device 100 is rotated by the center angle θ101 starting from P4A and P4 in the fan-shaped regions 101 and 101A, and the end point (P1, When P1A) is reached, the rotational angular velocity of the injection device 100 is switched from v101 to v102.

Similarly, in each step (b) to (d) of FIG. 6, when the injection direction of the injection device 100 reaches the end points (P2, P2A) of the regions 102 and 102A, the rotational angular velocity of the injection device 100 is v102. To v103 (step (b)), and when the injection direction of the injection device 100 reaches the end points (P3, P3A) of the regions 103 and 103A, the rotational angular velocity of the injection device 100 is changed from v103 to v102. (Step (c)).
Furthermore, when the injection direction of the injection device 100 reaches the end points (P4, P4A) of the regions 104 and 104A, the rotational angular velocity of the injection device 100 is switched from v102 to v101 (step (d)).

FIG. 5 is a characteristic diagram of the center angle θ-rotation angular velocity v of the injection device, and shows a planned value with a dotted line and an actual measurement value with a solid line. Here, when a hydraulic motor is used as the mechanism for rotating the injection device, the characteristic delays with respect to the desired characteristic (planned value in FIG. 5) due to oil leakage, valve response delay, etc. Occurring (actually measured values in FIG. 5), there are cases where the rotational angular velocity does not fluctuate even when the nozzle of the injection device reaches a predetermined position or center angle. In such a case, it becomes impossible to form an underground solid body having a substantially rectangular cross section, and there is a risk of improving an area that does not need to be improved. Or the area | region which should be improved is not improved and there exists a possibility that it may become impossible to ensure the width dimension (required thickness t: refer FIG. 6) requested | required of an underground wall.
On the other hand, in the illustrated embodiment, the injection device is rotated by an electric motor, and the characteristics as planned values indicated by the dotted line in FIG. 5, that is, characteristics without time delay can be achieved by feedback control. Here, the rotational angular velocities (coordinates on the vertical axis) v101, v102, v103 and the central angle or the rotation angle (coordinates on the horizontal axis or the range of the horizontal axis) θ101, θ102, θ103 in FIG. 5 are the steps shown in FIG. These are the position (rotation angle) at which the angular velocity changes and the rotation angular velocity when implemented.

Here, in the construction of the underground wall, characteristics as planned values indicated by the dotted lines in FIG. 5 can be realized, that is, the rotational speed (for example, the rotational angular speed) is switched at a predetermined position (for example, the central angle of the injection device). There is a demand for visual confirmation.
In order to respond to a request for visual confirmation, in the verification device according to the illustrated embodiment, the rotational speed (rotational angular velocity) of the injection device is set at a predetermined position (center angle of the injection device) before the construction by the injection device. It can show that it switches. In other words, by using the verification apparatus according to the illustrated embodiment, it is possible to perform a simulation before the underground wall is constructed.

In FIG. 1 showing the outline of the illustrated embodiment, an inspection apparatus, generally designated by reference numeral 10, has a rotating shaft 4, and the rotating shaft 4 is attached to and detached from a rotation drive source 20 (spindle) of an injection device (not shown). Can be installed freely. The rotational drive source 20 is rotationally driven by an electric motor (for example, an electric motor). Here, the spindle 20 (when an unillustrated injection device is connected) is configured such that when the injection nozzle of the injection device reaches a predetermined position (position where the rotation speed or angular velocity of the injection device should be switched), the rotation speed (angular velocity) is switched. It is configured. A configuration in which the rotational speed (angular speed) is switched at a predetermined position is known and can be assembled using a commercially available product.
In FIG. 1, reference numeral 30 denotes a display device, which receives a detection signal (a detection signal of a rotation angle and a rotation speed) from the encoder 6 via a detection signal line S1, and has a rotation angle as shown in FIG. It has a function to determine the characteristics of angular velocity. The control device denoted by reference numeral 40 has a function of controlling the rotation of the spindle 20 (or the rotation of the rotating plate 1) according to desired characteristics (for example, the characteristics indicated by the dotted line in FIG. 5). The rotation control signal is sent to the spindle 20 via the control signal line S2.

As described above, an injection device (not shown) is connected to the spindle 20 and rotated before the formation of an underground solid body having a substantially rectangular cross section. By connecting the shaft 4) and simulating that the rotation speed (rotational angular speed) of the injection device is switched at a predetermined position, the injection device that performs the cross-section substantially rectangular underground solid body formation is verified.
The rotating plate 1 is fixed to the lower end of the rotating shaft 4 of the verification device 10 by a conventionally known method in such a manner that the rotating center of the rotating shaft 4 coincides with the rotating center of the rotating plate 1. Therefore, the rotating plate 1 rotates integrally with the spindle 20 and the rotating shaft 4.
On the upper surface of the rotating plate 1, a circumferential position display means 1A (for example, an arrow: see FIG. 3) is provided at a circumferential position corresponding to the position of the spray nozzle of the spray device.
Further, a detected portion 2A detected by the proximity switch 2 is provided in the vicinity of the outer peripheral edge portion of the rotating plate 1 in the direction of the arrow as the circumferential position display means 1A.

In FIG. 2, a predetermined position display plate 5 is installed below the rotating plate 1 of the test apparatus 1 in parallel with the rotating plate 1 and at a predetermined interval from the rotating plate 1. It is detachably installed on either.
The predetermined position display board 5 is provided with proximity switches 2 (sensors) at a plurality of predetermined positions P1, P2, P3, P4, P1A, P2A, P3A, and P4A (see FIG. 2) in the circumferential direction. A display device 3 (for example, a display lamp) is provided adjacent to the outside of the proximity switch 2 in the radial direction.

The proximity switch 2 includes a detected portion 2A (provided at the arrow position as the circumferential position display means 1A in FIG. 1) provided on the rotary plate 1 at predetermined positions P1, P2, P3, P4 in the circumferential direction. It has a function of detecting arrival at P1A, P2A, P3A, and P4A, and a function of transmitting the detection to each display device 3 via a signal transmission line S3 (see FIG. 1).
In order to prevent the complexity of the illustration, the rotating plate 1, the circumferential position display means 1A (see FIG. 3), and the detected portion 2A are not displayed in FIG.
The detected portion 2 </ b> A provided on the rotating plate 1 moves along a circle C (indicated by a one-dot chain line in FIG. 2) connecting the installation positions (that is, predetermined positions) of the proximity switch 2 by the rotation of the rotating plate 1.

When the rotating plate 1 rotates and the detected portion 2A provided on the rotating plate 1 reaches the position of the proximity switch 2 of the predetermined position display plate 5, the detected switch 2A of the proximity switch 2 of the predetermined position display plate 5 Detecting the arrival, the detection signal is transmitted to the display device 3 (for example, a display lamp) via the signal transmission line S3 (see FIG. 1).
When the detection signal is transmitted from the proximity switch 2, the display device 3 displays that fact by, for example, light emission (lighting).

Here, predetermined positions P1, P2, P3, P4, P1A, P2A, P3A, and P4A at which the proximity switch 2 is provided on the predetermined position display plate 5 are circumferential directions in which the rotational speed (angular speed) of an injection device (not shown) is to be switched. It is the same as the position. That is, it is provided for the same purpose as P1, P2, P3, P4, P1A, P2A, P3A, and P4A described with reference to FIG. In other words, the proximity switch 2 is provided at a predetermined position in the circumferential direction where the rotational speed (angular speed) is to be changed, in a number corresponding to the number of the predetermined positions or the number of types of the rotational speed (angular speed).
An encoder 6 is installed in connection with the rotating shaft 4, and the encoder 6 has a function of detecting the rotation angle and rotation angular velocity of the rotating plate 1.

  When performing the verification work, when the rotation shaft 4 of the verification device 10 is connected to the spindle 20 and the spindle 20 is driven to rotate the rotation shaft 4 of the verification device 10, the rotating plate 1 also rotates integrally. And the to-be-detected part 2A (corresponding to the nozzle of the injection device) provided at the arrow position as the circumferential position display means 1A of the rotating plate 1 is a predetermined position P1, P2 of the proximity switch 2 of the predetermined position display plate 5. , P3, P4, P1A, P2A, P3A, P4A, the display device 3 (display lamp) emits light (lights up). At the same time, the rotational speed (angular speed) of the spindle 20 changes, and the rotational speed (angular speed) of the rotating plate 1 changes.

As described in FIG. 6, the rotational angular velocity changes from v101 to v102 at the predetermined positions P1 and P1A, the rotational angular velocity changes from v102 to v103 at the predetermined positions P2 and P2A, and the rotational angular velocity at the predetermined positions P3 and P3A is v103. From v102 to v101 at predetermined positions P4 and P4A.
Here, the operator (verifier) can visually check that the rotation speed (angular speed) fluctuates when the display lamp 3 emits light (lights up). At this stage, it is confirmed that the angular velocity changes (switches) at a predetermined position (center angle).

The verification method by the verification apparatus 10 described with reference to FIGS. 1 and 2 is a schematic cross-sectional view that is a section of the underground wall while the injection apparatus is connected to the rotary drive source 20 (spindle) and the injection apparatus is rotated. This is done prior to building the rectangular underground wall.
In addition, when constructing the underground wall after verification, the injection device is inserted into the borehole drilled to the area where the underground wall is to be constructed, and the improvement material is included from the injection device rotating in the same direction. The area where the underground wall should be created is improved by jetting a jet and cutting the in situ soil, mixing the improver and the in situ soil, and stirring.

In such improvement, as described with reference to FIG. 6, in the case where the region in the substantially longitudinal direction is improved, the cutting distance of the jet including the improving material is lengthened, and the approximate length of the underground wall to be created is increased. When the region in the direction orthogonal to the direction is improved, the cutting distance of the jet including the improving material is shortened.
In the underground wall construction method, when improving the longitudinal region of the underground wall to be constructed, the rotational speed (angular velocity) of the injection device is decreased, and the region perpendicular to the underground wall to be constructed When improving this, the rotational speed (angular velocity) of the injection device is increased. For example, as shown in FIG. 6, the rotation speed (angular velocity) of the injection device changes (switches) to three types (v101, v102, v103) while the injection device rotates halfway.

Here, a mechanism (spindle 20) for rotating an injection device (not shown) is driven by an electric motor (for example, an electric motor).
As described above with reference to FIG. 5, unlike the case where a hydraulic motor is used, in the illustrated embodiment, since it is rotationally driven by an electric motor (for example, an electric motor), for example, by performing feedback control, a time delay is achieved. It has been confirmed by the inventor's experiment that a desired center angle θ-rotational angular velocity characteristic can be obtained without causing the above.

Next, the construction procedure of the embodiment will be described based on the flowchart of FIG.
First, in step S1, the rotating shaft 4 of the test apparatus 10 is connected (mounted) to the spindle 20.
In the next step S <b> 2, the spindle 20 is rotated, and the rotating plate 1 is rotated via the rotating shaft 4 of the verification device 10.

In step S3, the detected portion 2A (circumferential position display means 1A) provided on the rotating plate 1 reaches the position (predetermined position) of the proximity switch 2 of the predetermined position display plate 5, and the detected portion of the rotating plate 1 is detected. When the part 2A reaches a predetermined position or rotates by a central angle corresponding to the predetermined position, the display lamp 3 emits light (lights up). The person who performs the verification visually checks whether or not the rotation speed (angular speed) of the rotating plate 1 changes (switches) when the display lamp 3 emits light (lights up).
As described above, the proximity switch 2 is provided at a plurality of predetermined positions P1, P2, P3, P4, P1A, P2A, P3A, and P4A, and every time the detected portion 2A reaches a plurality of predetermined positions, It is confirmed whether or not the rotational speed (angular speed) of the rotating plate 1 changes, and the verification work is performed. In the illustrated embodiment, the injection device (not shown) changes the rotational speed (angular speed) to, for example, three types (three kinds of rotational speeds or angular speeds v101, v102, v103) when improving one generally rectangular region. ing.
Although not clearly shown, in step S3, the display device 30 determines the characteristics of the rotation angle and the angular velocity as shown in FIG. 5 based on the rotation angle and the rotation angular velocity detected by the encoder 6, and displays them. Displayed on a display or the like.

In step S3, when it can be confirmed that the rotation speed (angular speed) of the rotating plate 1 changes when the display lamp 3 emits light (lights up) (step S3 is “Yes”), the process proceeds to step S4. On the other hand, if it cannot be confirmed that the rotation speed (angular speed) of the rotating plate 1 changes when the display lamp 3 emits light (lights up) (step S3 is “No”), the process proceeds to step S6.
In step S4, based on the rotation angle θ-angular velocity v characteristic of the rotating plate 1 determined by the display device 30 (see FIG. 5), the position at which the rotating speed of the rotating plate 1 has changed (rotation angle θ: example in FIG. 6). Then, it is determined whether or not the rotation angles θ101, θ101 + θ102, θ101 + θ102 + θ103) and the rotation speed (angular speed: v101, v102, v103 in the example of FIG. 6) are appropriate. This determination can be made by, for example, an operator. Further, the rotation angles (θ101, θ101 + θ102, θ101 + θ102 + θ103 in the example of FIG. 6) and the rotation angular velocities (v101, v102, v103 in the example of FIG. 6) that the rotation angular velocity of the rotating plate 1 is changed by automatic control are appropriate. It is also possible to determine whether or not.

If it is determined in step S4 that the rotational speed has changed and the rotational speed is appropriate (step S4 is Yes: if both step S3 and step S4 are Yes), the process proceeds to step S5. It is determined that the result is “pass”. Then, the process proceeds to step S7.
On the other hand, if it is determined in step S4 that the rotational speed has changed and the rotational speed is not appropriate (No in step S4), the process proceeds to step S6, where it is determined that the “verification result is rejected”. To do. In other words, if any one of step S3 and step S4 is “No”, it is determined that the test is unacceptable.
In step S7 (when it is determined that “the test result is acceptable”), the rotation of the spindle 20 is stopped and the test is ended. And the test | inspection apparatus 10 is removed from the spindle 20, and an injection apparatus is connected to the spindle 20 after that. And it progresses to step S8 and constructs underground wall creation.

The verification method and the verification apparatus 10 according to the illustrated embodiment are, for example, a simulation that the rotational speed (angular speed) of the injection device “changes the rotational angular speed at a desired angle (a position in the circumferential direction corresponding to the central angle)”. The simulation is very useful in the construction of underground walls.
According to the verification method and the verification device 10 according to the embodiment shown in FIGS. 1, 2, and 4, the injection device is connected to the rotary drive source 20 (spindle), and the injection device is rotated while the ground wall is rotated. By creating an underground solid body with a roughly rectangular section, which is a section, an underground solid section with a roughly rectangular section, which is a section of the ground wall, is created by rotating the spraying device by performing an inspection. It can be visually confirmed beforehand whether or not it is possible.
According to the illustrated embodiment, it is possible to visually confirm that the rotational speed (angular speed) of the injection device “changes the angular speed at a desired angle (position corresponding to the center angle)”. Prior to the construction of the underground wall construction, it is possible to perform the simulation that “if the injection device (not shown) is rotated, the angular velocity changes at a desired position”.

Furthermore, according to the illustrated embodiment, since the mechanism (spindle 20) for rotating the injection device is driven by an electric motor (for example, an electric motor), unlike the case where a hydraulic motor is used, the underground wall of the injection device is used. Can be reliably ensured the width dimension required for the underground wall by rotating the injection device with the center angle θ-rotational angular velocity characteristics without time delay.
And, as described above, prior to the creation of the underground wall, a simulation that the injector can be rotated by the center angle θ-rotational angular velocity characteristic without time delay and the width dimension required for the underground wall can be reliably secured. Can be done.

Next, a modification of the illustrated embodiment will be described with reference to FIG.
In the modified example of FIG. 3, similarly to the embodiment of FIGS. 1 and 2, the predetermined position display plate 5 has a plurality of predetermined positions P1, P2, P3, P4, P1A, P2A, P3A, and P4A in the circumferential direction. Each proximity switch 2 is provided, and when the detected portion 2A (corresponding to the nozzle of the ejection device) of the rotating plate 1 reaches a predetermined position, the proximity switch 2 at the predetermined position is detected and the display device 3 is turned on. At the same time, the rotation speed of the spindle 20 changes, and the rotation speed of the rotating plate 1 changes.
However, in the modification of FIG. 3, many proximity switches 2 are provided at small intervals in the circumferential direction as compared to FIG. 2. 3 is displayed in a state rotated 90 ° counterclockwise with respect to FIG.

Also in FIG. 3, as shown in FIG. 1, an arrow (circumferential position display means 1 </ b> A) is displayed on the rotating plate 1 of the verification device 11 at a position corresponding to a nozzle of an injection device (not shown), and the radius A detected portion 2A is provided in the vicinity of the outer edge portion in the direction and at the position of the arrow 1A.
A predetermined position display plate 15 is installed below the rotary plate 1 and is detachably installed on any of the above-ground parts. The predetermined position display board 15 is provided with a proximity switch 2 (indicated by hidden lines) and a display device 3 at a plurality of predetermined positions in the circumferential direction.

The number of proximity switches 2 and display devices 3 in FIG. 3 is much larger than that of the embodiment of FIGS.
In the embodiment of FIGS. 1 and 2, the required thickness t of the underground consolidated body having a substantially rectangular cross section is set to only one type.
On the other hand, in the modification of FIG. 3, the predetermined position for switching the rotational speed (angular speed) of the injection device is changed to another position in the circumferential direction from the position shown in the embodiment of FIGS. By changing), the thickness t (see FIG. 6) and the length (the length in the left-right direction of one section of FIGS. 6A to 6D) of the underground wall having a substantially rectangular cross section can be changed. I can do it.
For example, in FIG. 3, the predetermined positions P1, P4, P1A, and P4A in FIGS. 1 and 2 can be changed to circumferential positions P11, P41, P1A1, and P4A1, respectively. As a result, the central angle corresponding to the creation of the longitudinal section of the generally rectangular section is expanded from θ1 to θ2, and the underground wall having the generally rectangular section having a large minimum thickness t can be created.

On the other hand, when the predetermined positions P1, P4, P1A, P4A are changed to the circumferential positions P12, P42, P1A2, P4A2, respectively, the center angle corresponding to the longitudinal construction of the cross-sectional outline rectangle decreases from θ1 to θ3, An underground wall having a rectangular shape with a minimum (thickness) small (thin) cross section can be formed.
In this way, in the modification of FIG. 3, a plurality of predetermined positions for providing the proximity switch 2 are provided at small intervals in the circumferential direction, thereby setting a plurality of types of dimensions of the minimum thickness t of the underground wall to be created. Can be tested.
The configurations and operational effects of the modification of FIG. 3 other than those described above are the same as those of the embodiment of FIGS.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Rotary plate 1A ... Display means 2 ... Sensor (proximity switch)
2A ... detected part 3 ... display device (display lamp)
4 ... Rotating shafts 5, 15 ... Predetermined position display plate 6 ... Encoders 10, 11 ... Testing device 20 ... Rotation drive source (spindle)
30 ... Display device 40 ... Control device

Claims (5)

Prior to connecting the injection device to the rotational drive source, the step of connecting the rotating shaft of the test device having a rotating plate, a sensor and a display device,
The rotating plate of the verification device has a circumferential position display means corresponding to the position of the injection nozzle of the injection device, and the sensor of the verification device has a circumferential position display means of the rotating plate at a predetermined position in the circumferential direction. Is detected and transmitted to the display device, and the display device is notified from the sensor that the circumferential position display means has reached a predetermined position in the circumferential direction. It is configured to display sometimes, and the predetermined position in the verification device is the same as the position where the rotation speed of the injection device should be switched,
Activating the rotational drive source, rotating the rotating plate of the verification device, and visually recognizing that the rotational speed of the rotating plate changes when the circumferential position display means reaches the predetermined position;
A step of stopping the rotational drive source after the step of visually recognizing, removing the rotational shaft of the verification device from the rotational drive source, and connecting the injection device to the rotational drive source;
An inspection method for building underground walls, characterized by comprising:   The step of detecting the rotation angle and rotation angular velocity of the rotating plate, the step of determining and displaying the characteristics of the detected rotation angle and rotation angular velocity, and the characteristics of the displayed rotation angle and rotation angular velocity of the rotating plate The verification method for underground wall construction of Claim 1 which has the process to judge based on.   Boring holes are drilled to the area where the underground wall is to be built, an injection device is inserted into the drilled borehole, and a jet containing the improvement material is injected from the injection device rotating in the same direction to in situ. When the improvement material and in-situ soil are mixed, the region where the underground wall is to be created is improved by stirring and the longitudinal region of the underground wall to be improved is improved during the improvement. In order to improve the area in the direction perpendicular to the underground wall to be created by increasing the cutting distance of the jet containing the improvement material, the underground wall construction should be made to shorten the cutting distance of the jet containing the improvement material. The verification method for underground wall construction according to any one of claims 1 and 2, which is performed prior to execution of the construction method. In the verification apparatus for underground wall construction used with the verification method for underground wall construction of any one of Claims 1-3,
A rotating plate, a sensor, a display device, and a rotating shaft;
The rotation shaft is configured to be detachable from a rotation drive source of the injection device,
A circumferential position display means corresponding to the position of the injection nozzle of the injection device is displayed on the rotating plate of the verification device,
The sensor of the verification device has a function of detecting that the circumferential position display means of the rotating plate has reached a predetermined position in the circumferential direction, and a function of transmitting the detection to the display device,
The display device has a function to display when the fact that the circumferential position display means has reached a predetermined position in the circumferential direction is transmitted from the sensor,
The underground wall construction verification device, wherein the predetermined position in the circumferential direction is the same as the position at which the rotation speed of the injection device should be switched.   5. An underground wall construction test according to claim 4, comprising a detection device for detecting the rotation angle and rotation angular velocity of the rotating plate, and a display device for determining and displaying characteristics of the detected rotation angle and rotation angular velocity of the rotating plate. apparatus.

Images