JP2001020276A - Ground condition detecting apparatus for use in jet-type complex agitating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure an advanced distance of the front end of high-pressure jet under the ground, and to confirm the shape and structure of a hardened structure which has been executed, in a jet-type complex agitating method in which the high-pressure jet containing a hardener is injected from a location near an agitating blade edge into the ground, and then the hardener and ground soil are mixed and agitated to carry out soil improvement. SOLUTION: A radius measuring means formed of a cylinder 4 and a piston 5 is arranged in parallel with one of agitating blades 2. After formation of an area in which high-pressure jet 10 containing a hardener, and ground soil have been mixed and agitated, the agitating blade 2 having the radius measuring means arranged in parallel therewith is moved to the area, and the cylinder 4 and the piston 5 are extended under the ground in a radial direction by controlling oil pressure on the ground. At this time, based on fluctuations of reaction from the ground soil received by the piston 5 (determined based on a change in oil pressure) and measurement of a front end location 6 of the piston 5, an advanced distance of the front end of the high-pressure jet 10 under the ground is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground condition detecting apparatus including a measurement of a reaching distance of a high-pressure jet (including a solidified material) jet in the ground in a jet-type combined stirring method.

[0002]

2. Description of the Related Art A means for improving the ground strength by supplying and mixing a solidified material into the ground to form a solidified structure by using a jet stirring method in addition to the mechanical stirring method is known.

[0003] In this type of construction method, a ground is stirred by rotating a stirring blade attached to a rotary excavation shaft, and fluid is supplied into the ground from a nozzle opened at a predetermined location from the base of the stirring blade to the blade tip. A jet structure is used to mix the solidified material and the ground soil by jetting and create a solidified structure in the ground within the range.At this time, the required amount of the solidified material is supplied and they are evenly distributed. It is possible to at least guarantee that the range of the rotation trajectory of the stirring blade is the outer edge position of the solidified structure when trying to confirm the area of the solidified structure created in the ground on the assumption that it is mixed with Even in the past, the reach of the outward high-pressure jet jet in the ground fluctuates depending on the soil properties, soil properties (strength, water content, void ratio), etc. To do
In view of the safety factor, measures such as applying an unnecessarily high pressure to the jet fluid or securing a large supply of the solidifying material were taken, so that economic construction was difficult.

[0004] Therefore, a method has been proposed (see Japanese Patent Publication No. Hei 7-30551) which can surely control the reach of the jet jet in the ground and solves the above-mentioned disadvantages. That is, at least one pair of stirring blades is provided in the axial direction with respect to the excavation rotation axis, and jet jets containing solidified material from the outward nozzles provided at the respective stirring blade ends are mutually crossed in the ground outside the stirring blade ends. Set to intersect, specify the reach of the jet in the ground by concentrating the energy of the jet jet at the location, supply of solidification material, limit the mixing range, the solidification structure to be constructed The solidified structure construction control method that determines the outer peripheral edge,
That is it.

[0005] According to the construction method, if the direction of the jet jet of the outward nozzle provided on the stirring blade is adjusted and its intersection position is specified, the reach of the jet jet in the ground is determined, and the excavation rotation axis is determined. It is said that economical construction of a solidified structure having a desired radius becomes possible.

By the way, when constructed by the above method,
Even if the supply conditions of the solidified material are kept constant, it is not specified how far in the ground the solidified material actually reaches and the solidified structure is formed. Under unusual conditions, it is possible to see the certainty but not to see the certainty. In a small-scale experiment, the construction results under the required conditions were excavated from the ground,
Although the shape and structure of the solidified structure can be measured and compared with design conditions, such measurement requires a large amount of expense as the object becomes large. Furthermore, in the case of a scale that is usually constructed, actual measurement of a solidified structure to be formed is practically impossible.

[0007] Further, it is not possible to excavate an object one by one during the construction, and to actually measure and confirm the object. Nevertheless, in the above-mentioned construction method, a request to specifically detect the reaching distance of the jet jet containing the solidified material in the ground is often made not only by the construction requester but also by the contractor in terms of construction management. ing. That is, if the specific reaching distance of the jet jet in the ground is known, it is possible to control the supply pressure and the supply amount of the solidified material in accordance therewith.
Furthermore, when newly strengthening the ground in the vicinity of the existing underground structure (including the solidified structure), there is no gap between the existing underground structure and the area of the newly constructed structure,
A requirement that the two should not be too close to each other or that they should not be unnecessarily close to each other is often demanded from the viewpoint of economical construction.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention
In addition to solving the above-mentioned problems inherent in the conventional means, the conventional request sent to this type of construction method is fulfilled as much as possible, and, during construction, if necessary, the reach distance of the jet jet in the ground or To provide a ground condition detection (including measurement of the distance of a jet jet) device in a jet-type combined stirring method capable of measuring a close position without a time lag and collecting information necessary for construction management on the ground. With the goal. Another object of the present invention is to visually display the construction state in the ground, specifically identify the shape and structure of the solidified structure, and confirm the accuracy and reliability of the construction. Alternatively, it is intended to provide means for detecting a positional relationship of a new construction area with respect to an existing underground structure.

[0009]

Means for Solving the Problems In order to achieve the above object, the present invention comprises the following constituent elements. (1) Consisting of a mechanical stirring blade mounted radially with respect to the rotary excavation axis and a jet nozzle installed outwardly near the end of the stirring blade, rotating the excavation axis and injecting into the ground from the jet nozzle. In the jet-type combined stirring and excavating apparatus in which the tip of the high-pressure jet stream to reach a predetermined position outside the stirring area of the stirring blade to supply and mix the solidified material into the ground, For one thing,
A cylinder piston that expands and contracts in the radial direction is juxtaposed, and a front end of the cylinder piston extends at least over a required distance or a rotation locus of an arrival point in the ground at the tip of the high-pressure jet stream, and the cylinder piston is extended. Measure the fluid pressure of the pressure fluid to be moved and
Rotational excavation of the position of the front end of the cylinder / piston in the ground based on the movement of the wire linked to the displacement of the cylinder / piston or the supply capacity of the pressurized fluid supplied to the cylinder / piston, based on the situation change of the ground soil where the front end of the piston faces. A ground condition detection device in the jet-type combined stirring method that can measure the radius length from the shaft.

[0010] (2) At least one pair of mechanical stirring blades are installed in at least a pair of radial directions apart from each other in the axial direction with respect to the rotary excavation shaft, and the jet nozzles are respectively installed outwardly near the ends of the stirring blades. Inject from jet nozzle 2
In a jet-type combined stirring / digging apparatus in which two high-pressure jet streams intersect at a predetermined position in the ground outside the stirring area of the stirring blade to supply and mix the solidified material into the ground, On one of the wings, a radially extending and retractable cylinder / piston is juxtaposed, and the front end of the cylinder / piston extends at least beyond the rotation locus of an intersection in the ground of each of the high-pressure jet flows, and the cylinder / piston (1) The ground condition detecting device in the jet-type combined stirring method according to the above (1), wherein a change in the condition of the ground soil facing the front end can be measured.

(3) The jet type combined stirring method according to the above (1) or (2), wherein the cylinder / piston is mounted on the side following the excavation rotation direction of the stirring blade or inside the stirring blade. Ground condition detection device. (4) The cylinder / piston is double-acting and has a telescopic structure, and the length when fully retracted is almost the same as or slightly shorter than the radial length of one stirring blade. The ground condition detecting apparatus in the jet-type combined stirring method according to any one of the above (1) to (3), comprising:

[0012]

DETAILED DESCRIPTION OF THE INVENTION A drill shaft having a radially mounted mechanical stirring blade and a high pressure jet nozzle provided at least in the outward direction near the stirring blade end is rotated to reach a desired depth in the ground. While the ground is stirred by the stirring blades while excavating, the excavation axis is moved in the axial direction while reversing, and a fluid is supplied to the ground from a high-pressure jet nozzle or the like over a required depth, and the solidified material is ground by spraying. Ground mixed with soil to form a solidified structure in the area where the mechanical stirring blades reach or where the high pressure jet flow reaches or where the mechanical stirring blades reach and the high pressure jet flow reach In the improvement method of

After supplying or agitating water or solidified material to the ground by means of a high-pressure jet jet, a stirring blade provided with a cylinder / piston is set at a desired depth in the treated ground to determine a rotation phase angle. If it is stopped and the working fluid is supplied to the cylinder / piston to extend it, water or solidified material is injected into the ground from a high-pressure jet nozzle, and the mixed and mixed region has the soil characteristics and soil properties of the ground, Since the physical properties are different from the ground soil where the tip of the high-pressure jet flow could not reach, the movement resistance of the front end of the piston facing the ground fluctuates around the boundary of the area,
By measuring the position of the piston front end from the excavation axis at that time, the reaching distance in the ground of the high-pressure jet flow in the rotational phase angle direction at that depth, that is, the radius of the solidified structure or the like is concretely determined. Measurement can be performed, and materials for construction management can be obtained on the ground without time lag.

In the above-described measurement, the excavation axis is rotated intermittently as necessary to measure the reaching distance of the tip of the high-pressure jet in each direction angle in the ground, and the excavation axis is moved up and down in the axial direction. For the desired depth of the ground, the required number of times and measurement are performed in the same manner as described above. In addition, when constructing a new structure adjacent to the existing solidified structure, check whether the tip of the high-pressure jet flow has reached the outer periphery of the existing structure, and check whether the periphery of the new solidified structure is the existing solidified structure. It can be checked whether it is installed in connection with the structure or has a gap. Next, a preferred embodiment of the present invention will be described with reference to the drawings.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the agitation of a ground condition detection (including the measurement of the reach of a jet jet) device in a jet type combined stirring method including a stirring blade having a cylinder / piston mounted on a side that follows the excavation rotation direction in the device of the present invention. Perspective view of one embodiment of a wing,
FIG. 2 is a side view and a plan view of a main part of a ground condition detecting device in a jet-type combined stirring method shown partially cut away,
FIG. 2 is a diagram showing a cross section and operation of a cylinder / piston constituting a main part of the device. In FIG. 1, a stirring blade 2 provided axially symmetrically with respect to a rotary excavation shaft 1 and in a radial direction, along a trailing-side blade edge 3 with respect to the excavation traveling direction, and
Cylinder pistons 4 and 5 are attached in parallel with the longitudinal direction of the stirring blade 2.

In the drawing, the front of the agitating blade 2 rotating counterclockwise (in the direction of excavation) in the traveling direction is formed in the shape of a cutting blade on the lower side. When the agitating blade 2 rotates counterclockwise in the ground, rotary excavation is performed. A force for moving the shaft 1 downward and a digging force are generated to stir the ground soil. The trailing-side wing edge 3 with respect to the digging advance direction edge of the wing 2 is formed with a cutting edge on the upper side, and when the stirring blade 2 rotates in the reverse direction (clockwise), the force for moving the rotary excavation shaft 1 upward, Therefore, a force for pulling out from the ground is generated, and the ground soil is agitated. The cylinder / piston (radius length measuring or ground condition detecting means) 4 and 5 are used for excavation rotation of the rotary excavation shaft 1.
Attached along the blade edge 3 on the trailing side with respect to the advancing edge of the stirring blade 2 and in parallel with the longitudinal direction of the blade 2, the resistance received from the ground as much as possible during the excavating operation of the excavating shaft 1 is reduced. As described above, it is fixed to the stirring blade 2 via the cylinder 4 so as not to hinder the excavation function of the stirring blade 2.

The figure shows a case where the radius length measuring means 4 and 5 are reduced to the shortest length. The total length of the radius length measuring means 4 and 5 and the radial length of the stirring blade 2 (single blade) are shown. Are almost identical,
At least the extension side front end of the piston 5 is disposed slightly inside the radial end of the stirring blade 2, that is, disposed closer to the rotary excavation axis 1. Piston 5
The extension-side front end of the surface is perpendicular to the extension (stroke) direction so that the radius measuring means 4 and 5 receive a required resistance (reaction force) according to the condition of the ground when extending in the radial direction. 6
It has. Piping 7 to 9 connected to cylinder 4
Is a supply of a pressurized fluid for operating the radius measuring means 4 and 5,
2 (a) and 2 (b), it extends upward along the outer peripheral surface of the rotary excavation shaft 1 and is connected to a swivel joint 11 provided on the excavation shaft 1. .

A predetermined pressure oil is supplied to and discharged from the radius measuring means 4 and 5 through a pipeline connected to the swivel joint 11 via a hydraulic unit 12, a flow meter 13 and hydraulic hoses 14 to 16 installed on the ground surface. And control its operation. By measuring the supply amount or discharge amount and the pressure of the pressure fluid when the radius measuring means 4 and 5 are operated,
At this time, the position of the extension side end face 6 of the piston 5 in the ground and the state of the ground soil can be measured. In addition, about the position in the ground of the extension side end surface 6 of the piston 5 mentioned above,
If mechanical means, for example, a wire connected to the piston end face 6 is extended along the rotary excavation axis 1 to the ground surface and the wire portion is graduated, the graduation of the wire drawn in with the movement of the piston 5 can be obtained. Can be estimated from the ground surface how far the position of the extension-side end face 6 is away from the axis of the excavation shaft 1.

Returning to FIG. 1, the radius measuring means 4 and 5 attached to the stirring blade 2 are disposed at the forward edge of the blade 2 when the rotary excavation shaft 1 is rotated in the reverse direction. Although it is inevitable to receive frictional resistance (reaction force) from the ground, the ground soil is already agitated during excavation and is disturbed, so it can only withstand a relatively small reaction force compared to that of new ground soil Is fine. In order to protect the radius measuring units 4 and 5 from the flow resistance of the ground, there is a method of suspending and storing the length measuring units 4 and 5 inside the outer periphery of the stirring blade 2.

In the figure, a high pressure jet 10 is
This is a fluid containing a solidified material as a main component, which is injected and supplied into the ground from a jet nozzle 17 mounted outwardly near the other end of the stirring blade 2 provided in line symmetry with respect to the axis. In the example, while excavating shaft 1 and stirring blade 2 are reversed, they are injected into the ground outward and diagonally downward from the end of stirring blade 2. Another high-pressure jet jet (not shown) is simultaneously injected into the ground from a nozzle provided at another end of the stirring blade 2 and supplied, and the direction of the jet jet is determined by the high-pressure jet jet 10 and the predetermined level in the ground. It is set so that it intersects at the position. There may be a choice to set the direction of the intersecting high-pressure jets 10, 10 in a direction that assists the stirring blade 2 in reverse or forward rotation. In short, a combined stirring method is performed in which a solidified structure in which a stirring region by the high-pressure jet jet 10 is set outside the stirring region of the ground by the stirring blades 2. An example of the construction method and the operation method of the present measurement or ground condition detection device will be described later with reference to FIGS.

Referring to FIG. 2, FIG. 2 shows a main part of an apparatus for implementing the above-mentioned combined stirring method. FIG. 2 (a) shows a hydraulic unit for mainly controlling radius measuring means 4 and 5 remotely. 12 and the pressure oil switching valve and the supply amount of the pressure oil,
Means 13 for measuring fluctuations in oil pressure, display / recording means, and flexible conduits 14-16 for supplying and recirculating pressure oil
FIG. 4 is a partial side view of a radius measuring device including: a pressure oil supply amount is measured to measure a position of the end face 6 of the piston 5 in the ground (a radial distance from a rotary excavation axis) and a hydraulic pressure fluctuation. And the change in the condition of the soil at that location
Each has a function to detect.

A swivel joint 11 is used to connect the ends of the pressure oil supply and return lines 14 to 16 and the pipes 7 to 9 attached to the rotary excavation shaft 1 with each other. That is, while the hydraulic unit 12 and its control means are of the stationary surface type, the rotary excavating shaft 1 rotates and moves in the vertical direction during operation.
For the supply and return lines 14-16 of the pressure oil connected to the swivel joint 11 attached to the, a pressure-resistant flexible tube having a sufficient length is used. 2 (b) and (c)
1A and 1B are a side view and a plan view of a stirring blade portion in the radius measurement device shown in a perspective view in FIG.
Members given the same reference numerals as in FIG.
This is the same as the description and name described above.

In FIG. 2 (c), when the rotary excavating shaft 1 excavates the ground, the excavating shaft 1 and the stirring blade 2 radially attached to the coaxial shaft 1 rotate in the direction of the arrow, that is, counterclockwise. . The piston 5 of the radius measuring means attached to the trailing edge 3 side of the stirring blade 2 is provided so as to expand and contract in the radial direction with respect to the excavation axis 1. During the stirring / mixing operation of the ground or at an appropriate time, the high-pressure jet jet 10 containing the solidified material is supplied from a nozzle 17 provided outwardly near the end of the stirring blade 2 provided symmetrically with the stirring blade 2 provided with the distance measuring means. Radiates into the ground.

Returning to FIG. 2 (b), the outer periphery (surface) 18 of the area where the ground is agitated by the rotation and agitation of the agitating blade 2 substantially coincides with the agitating blade 2 end, but at the same time, the agitating blade 2 end A high-pressure jet jet injected into the ground obliquely downward from the vicinity,
The rotation locus in the ground at the intersection with the high-pressure jet jet that is injected obliquely upward from the vicinity of the other stirring blade tip (not shown) (the rotary excavation axis 1 is also rotating) is the excavation axis 1
In contrast, the surface denoted by reference numeral 19, which is radially away from the end of the stirring blade 2, is indicated for convenience. The stirring blade 2
(Without the nozzle 17 or the measuring means 4, 5)
A plurality of pairs may be provided apart from each other in the axial direction of the rotary stirring shaft 1.

Accordingly, the ground indicated by the distance x between the outer peripheral surface 18 and the ground surface 19 in the area where the ground is agitated by the rotation and agitation of the agitating blade 2 is transferred from the rotating agitating blade 2 to the high-pressure jet stream. The ground soil is agitated by the cross-jet portion including the solidified material supplied and supplied to form a region where the solidified material is mixed with the ground soil. The region changes with the passage of time to form a solidified structure, but the soil properties and properties immediately after stirring and mixing differ from those of the original ground 20 outside the ground surface 19.

Now, in the state shown in the figure, when the pressure oil is supplied / discharged from the surface of the ground to the cylinder 4 side of the radius measuring means via the hydraulic pipes 7 to 9 to extend the piston front end face 6 radially into the ground. The flow resistance from the ground soil received by the end face 6 is at least the flow resistance from the ground after reaching the ground surface 19 and penetrating into the original ground 20 while moving in the region x of the cross jet portion, and after entering the y. There is a difference between the two depending on changes in the ground condition. If the position in the ground of the piston front end face 6 when the flow resistance from the ground fluctuates from the ground, that is, the radial radial distance from the rotary excavation axis is known from the ground, the cross jet of the high-pressure jet is It is possible to confirm what distance the stirring ground has reached based on specific numerical values. Therefore, the stroke of the piston front end face 6 of the injection radius measuring means is at least
It is configured to extend only the distance x + y.

FIG. 3 shows a sectional operation view of one embodiment of the cylinder pistons 4 and 5 of the radius measuring means mounted along the blade length of the stirring blade 2, which is provided with a two-stage type extension mechanism. (A) The stroke is the shortest contracted state, that is, almost the same length as the blade length of the stirring blade 2, and (b) the stroke is
Where the first stage is extended, (c) the stroke is the first stage has been extended and the second stage is extended, (d)
The stroke shows a state where the first stage and the second stage have both been extended, and the end face 6 of the piston 5 has moved to a position farthest from the rotary stirring shaft. The cylinder / pistons 4 and 5 of the above-mentioned injection radius measuring means also adopt a double-acting structure, and control the supply and discharge of pressurized oil from the ground to the state shown in FIG. Shrink and displace. Although the illustrated cylinder / pistons 4 and 5 comprise a three-port two-stage extension mechanism, depending on the structure, they operate with a two-port two-stage extension mechanism.
possible.

The structure and operation will be described with reference to FIG. 3. In FIG. 3A, the cylinder 4 has pressure oil supply / discharge holes (ports) A and B at its base and end, respectively.
C are provided and communicate with the spaces H and J in the cylinder 4, respectively. A piston 51 that reciprocates and slides in the inner cylinder of the cylinder 4 is used as a base. A hollow rod 52 that extends and slides outward from the end of the cylinder 4 and a double cylinder that is concentric with the rod 52 are formed. The first-stage piston rod formed by connecting the center rods 53 is fitted to the cylinder 4, and the port A of the cylinder 4 is inserted into a space H surrounded by the inner cylinder and the piston 51. The ports B and C communicate with a space J defined by the cylinder 4 and the piston 51 and the rod 52, respectively. FIGS. 3C and 3D show the piston 51.
In the mutual positional relationship of each member in the above (described later)
A through hole C1 for communicating the space K with the port C;
A through hole B1 communicating the space B and the port B surrounded by 3 is formed independently of each other.

Further, the through hole B1 is always in communication with the space J through the small hole s. A piston 54 reciprocatingly sliding between the inner surface of the hollow rod 52 of the first stage piston rod and the outer peripheral surface of the center rod 53 is used as a base end, and a hollow extending and sliding outward from the end of the rod 52 is formed on the piston 54. A second-stage piston rod formed by connecting rods 55 is fitted to the hollow rods 52 and 53, and a space K [surrounded by the inner base of the rod 52 and the piston 54 formed at that time. 3 (c)] and the port C (in relation to each other in FIGS. 3 (c) and 3 (d)), the through hole C1 is provided in the piston 51 as described above. .

A cylindrical space exists between the inner peripheral surface of the hollow rod 55 and the outer peripheral surface of the center rod 53, and is thereby surrounded by the inner cylinder of the rod 52, the piston 54 and the outer peripheral surface of the rod 55. The space L and the space M in the rod 55 communicate with each other through a small hole m formed in a cylindrical wall near the base of the rod 55. The operation principle of the injection distance measuring means having the configuration as described above will be described below.

(1) Extending operation In FIG. 3A, the pressure oil supplied from the port A fills the space H in the cylinder 4 and pushes out the piston 51.
It operates to extend the first-stage piston rod outward (see FIG. 3B). At the same time, the pressure oil filling the space J is discharged from the ports B or C or the ports B and C. Here, ports A and B,
The state of the pressure oil flowing through C is controlled by a pipeline switching device provided on the ground.

As can be seen from FIG.
When 1 reaches the end of the cylinder 4 and the first-stage piston rod has been extended, the through-hole C1 and the port C provided in the piston 51 and the through-hole B1 and the port B communicate with each other. Then, the pipeline switching device is operated to close the port A and supply the pressure oil from the port C.
The flow space K is expanded through the port C1 provided in the first stage 1 and the piston 54 is moved to operate so that the second stage piston rod extends outward. At the same time, the space L
The internal pressure oil flows into the space M through the fine holes m formed in the cylindrical wall of the rod 55, returns to the port B through the through holes B1 provided in the piston 51, and is discharged [FIG. 3 (c)]. At this time, the small hole s provided in the piston 51 is closed by the inner wall of the cylinder 4.

FIG. 3D shows a state in which the space K is expanded, the piston 54 is moved to the final stroke, and the second stage piston rod is extended outward to the maximum. Even at that time, the pores m drilled in the cylindrical wall of the rod 55
Needs to communicate between the space L and the space M, the hole m must be located close to the piston 54 (see FIG. 3D). Here, the front end face 6 of the piston rod is at least a distance x + y from the reduced position.
It is required to have a stroke that moves only.

Normally, the ground condition detection is designed to measure during the extension stroke of the second stage piston rod. During the extension stroke of the second stage piston rod, the extension side end surface 6 of the piston 5 reaches the ground surface 19 and the end surface 6
When the reaction force (resistance) of the ground soil applied to the ground increases, the pressure of the supplied pressure oil changes before and after the resistance to overcome the resistance and extend the extension-side end face 6 of the piston 5. By comparing the oil pressure change timing with the amount of oil supplied to the piston cylinders 4 and 5 at that time, how far the extension side end face 6 of the piston 5 is away from the rotary excavation axis at the oil pressure change timing. Can be measured based on the measuring instrument 13 installed on the ground surface. How far the extension side end face 6 of the piston 5 was from the rotary excavation axis was determined by measuring the volume of pressure oil discharged up to that time.
Of course, it can be measured.

(2) Reduction operation In FIG. 3D, based on the operation of the pipeline switching device on the ground, port B is connected to the oil supply port and port C is connected to the oil discharge circuit.
The pressure oil supplied to the port B flows into the space M through the through hole B1 of the piston 51, enters the space L through the small hole m formed in the cylindrical wall of the rod 55, and pushes down the piston 54,
Move the second stage piston rod in the direction to shrink. At this time, since the space K communicates with the port C via the through hole C1, the pressure oil in the space K is discharged outside through the port C serving as a discharge circuit.

In FIG. 3C, the port B of the pressure oil supply line and the port C of the pressure oil discharge line function to move the second stage piston rod in the direction of contraction, and the piston 54 comes into contact with the piston 51. When the port C1 provided in the piston 51 is closed, the pipeline switching device is operated, and the port A communicates with the discharge pipeline. In FIG. 3B, the pressure oil supplied from the pressure oil supply pipe port B is the piston 5
When the piston rod of the first stage is moved in the direction of contraction through the small hole s formed in the hole 1 and the piston rod of the first stage is moved in the direction of contraction, the pressure oil supply pipe port B and the space J are directly communicated with each other, Is discharged from the port A, the first stage piston rod returns to the original position. FIG. 3A shows the relative positions of the members in the reduced state.

FIG. 4 is a schematic view showing the excavation and intrusion process of the rotary stirring shaft 1 in the cross-jet type combined stirring method, in which (a) guides the excavation stirring device to a predetermined position on the ground,
When the leader and the rotary excavation shaft 1 are arranged perpendicular to the surface of the ground, in the figure, the upper end of the rotary excavation shaft 1 is provided on a stirrer that is guided by the leader and slides up and down, and is provided radially near the lower end. A plurality of stirring blades 2 are mounted in a plurality of stages. In this embodiment, a cylinder 4 as a radius measuring means is attached along one of the stirring blades 2. Further, nozzles 17, 17 are respectively provided outward at ends of a pair of stirring blades 2, 2 provided in the vertical axis direction of the rotary excavating shaft 1, and high-pressure jets from the pair of nozzles 17, 17 are provided. Jet stream 1
0 is adjusted so as to intersect in a predetermined space radially outside the end of the stirring blade 2.

In FIG. 4 (b), after setting the excavating and stirring device at a predetermined position, the stirrer is operated to lower the rotary excavating shaft 1, the stirring blades 2 and 2 along the leader while rotating in the excavation direction. , Stirring blades 2 and 2 provided near the lower end of the drilling shaft 1
Is penetrating and excavating into the ground. At that time, the solidified material is discharged and supplied into the ground from near the lower surfaces of the advanced stirring blades 2 and 2,
This is mixed and stirred with the original ground to create a solidified structure. The boundary between the agitation region of the original ground and the original ground is indicated by a plane 18. FIG. 4 (c) shows a situation where the above-mentioned operation (b) has been advanced and the stirring blades 2 and 2 have been completely penetrated to the predetermined (design) depth of the excavated ground, and then the fixed-position stirring is being performed. The ground having a constant radius around the rotary excavation axis 1 has a columnar structure in which the original ground soil and the solidified material are mixed and stirred by the rotation of the stirring blades 2 and 2.

FIG. 5 (a) shows a step of pulling out the rotary excavating shaft 1, and at least a pair of nozzles 17 and 1 provided at the tip thereof while rotating the stirrer and rotating the stirring blades 2 and 2 respectively.
High-pressure jet jet mixed with air and solidified material from 7
The rotary excavation shaft 1 is pulled out while jetting 0 and 10 and crossing in a predetermined ground radially outward from the end of the stirring blade 2. In this step, the columnar structure having a larger diameter is obtained by mixing and agitating the original ground soil and the solidified material placed in the jet along the spiral rotation trajectory of the jet flow intersection in a region radially outward from the surface 18. Is formed.

The outer peripheral surface of the columnar structure in the ground is usually
It is considered to be the rotation trajectory of the intersection of the jet jet. A boundary surface between the mixing / stirring region and the original ground is referred to as a ground surface 19 (see FIG. 2B). However, unlike the place where the mechanical stirring such as the stirring blades 2 and 2 is performed, the boundary soil is agitated and mixed with the original ground soil by the jet jets 10 and 10 containing the solidified material. It is not certain that the trajectory of the jet jet intersection is located in the ground as designed. Because it is formed in the ground during construction, it cannot be seen through.

FIGS. 5B and 5C show the above-mentioned boundary ground surface 1.
9 shows the radius measurement process, and after continuing the process of FIG.
Again, the stirrer is rotated in the penetration direction, and the stirring blades 2 and 2 are sunk to a predetermined depth. Supply and communicate with the cylinder 4 and piston 5 of
The piston 5 extends in the radial direction. At this time, since the movement resistance of the piston 5 is different between the mixing / stirring area x and the original ground, the fluctuation of the supply oil pressure and the position of the piston front end 6 at that time are measured on the ground surface. I do. The position of the boundary ground plane 19, that is, the distance from the rotary excavation axis 1 to the ground plane 19, the area x
The size of can be confirmed.

At a rotation angle 0 of the rotary excavation shaft 1,
After measuring the radius of the boundary ground surface 19, rotate the rotary excavation shaft 1 by 90 °, and similarly set the boundary ground surface 1
9 and then turn 90 ° to measure the radius of the boundary ground plane 19, and then rotate the rotary excavation axis 1 90 ° to turn the boundary ground plane 1
Measuring the radius of 9 means that all the shapes of the agitation / mixing region x between the original ground soil and the solidified material by the cross jet jet at the depth of the measuring device could be measured. If necessary, in the depth direction of the stirring / mixing region x,
By applying the measuring means in a plurality of stages, it is possible to grasp the whole picture of the solidified structure formed vertically in the ground.

FIG. 5 (d) shows that in the step of pulling out the rotary excavating shaft 1, the agitator is rotated in the reverse direction to rotate the stirring blades 2 and 2, while the air and the high pressure solidify from a pair of nozzles 17 and 17 provided at the tip thereof. A jet jet mixed with the material is jetted and intersected in the ground, and along the rotation locus of the intersection, a mixing / stirring area of the original ground and the solidified material is formed, and the jet is jetted at a required depth. FIG. 3 illustrates an example in which injection and supply of the jet are stopped to form a solidified structure having a step in the ground.

At a rotation angle 0 of the rotary excavation shaft 1,
After measuring the radius of the boundary ground surface 19, rotate the rotary excavation shaft 1 by 90 °, and similarly set the boundary ground surface 1
9 and then turn 90 ° to measure the radius of the boundary ground plane 19, and then rotate the rotary excavation axis 1 90 ° to turn the boundary ground plane 1
Measuring the radius of 9 means that all the shapes of the agitation / mixing region x between the original ground soil and the solidified material by the cross jet jet at the depth of the measuring device could be measured. If necessary, in the depth direction of the stirring / mixing region x,
By applying the measuring means in a plurality of stages, it is possible to grasp the whole picture of the solidified structure formed vertically in the ground.

FIG. 5 (d) shows that in the step of pulling out the rotary excavating shaft 1, the agitator is rotated in the reverse direction to rotate the stirring blades 2 and 2, and a pair of nozzles 17 and 17 provided at the tip end thereof form air and solidified material. A high-pressure jet jet is ejected and intersects in the ground to form a mixing / stirring area with the original ground soil and solidified material along the rotation locus of the intersection, and at the required depth, FIG. 3 illustrates an example in which injection and supply of the jet are stopped to form a solidified structure having a step in the ground.

[0046]

The invention of the present application has the above-described structure, and when the solidified structure under the ground is widely constructed by using the jet-type composite agitation method, the outward injection from near the end of the agitation blade. Distance in the ground at the tip of the high-pressure jet jet, that is, the range of the agitation / mixing area of the high-pressure jet jet containing the ground soil and the solidified material can be arbitrarily measured during construction, and data on construction management in the above method To collectively and economically enable the implementation of the design items according to the characteristics of the ground based on the measurement results, to improve the reliability of the combined stirring method, and to improve the construction quality based on the method Provided is an injection distance measuring device for a high-pressure jet jet in a combined stirring method.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a rotary stirring blade portion in a device for measuring a jet distance of a high-pressure jet jet of a high-pressure jet jet in a ground condition detecting device of the present invention.

FIG. 2 is a side view showing only a main part of an embodiment of an apparatus for measuring a jet distance of a high-pressure jet jet in a jet type combined stirring method of the present invention, and a plan view of a rotary stirring blade portion.

FIG. 3 is an operation sectional view of a cylinder / piston constituting a radius length measuring means of the injection distance measuring device of the present invention.

FIG. 4 is an explanatory diagram showing a digging progress of a jet-type combined stirring method using a mixing and stirring device provided with the injection distance measuring device of the present invention.

FIG. 5 is an explanatory diagram showing a stirring / mixing and measurement process of a jet-type composite stirring method using a mixing / stirring device provided with a jet distance measuring device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary excavation axis 2 Stirring blade 3 Follower side stirring blade edge 4 Cylinder 5 Piston 6 Piston extension end face 7-9 Hydraulic piping 10 High pressure jet jet 11 Swivel joint 12 Hydraulic unit 13 Measuring device 14-16 Flexible pressure oil pipeline 17 Nozzle 18 Boundary area surface 19 Boundary ground surface

Continued on the front page F-term (reference) 2D040 AB05 BA02 BA08 BD05 DA11 DA12 DA16 EA18 EA21 GA00 2F051 AA06 AB02 AB06 AC01 AC09 BA01 2F069 AA15 AA38 BB40 DD16 DD25 GG04 GG15 GG39 GG51 GG56 JJ04 JJ11 Q05 MM10

Claims (4)

[Claims] 1. A mechanical stirring blade radially attached to a rotary excavation shaft and a jet nozzle installed outwardly near the end of the stirring blade. In the jet-type combined stirring and excavating apparatus in which the tip of the high-pressure jet stream to be injected to the outside reaches the predetermined position outside the stirring area of the stirring blade to supply and mix the solidified material into the ground, One of the wings is a cylinder that expands and contracts in the radial direction.
A piston is juxtaposed, and a front end of the cylinder / piston extends at least over a required distance or a rotation locus of a reaching point in the ground at the tip of the high pressure jet stream, and a fluid pressure of a pressure fluid for moving the cylinder / piston The cylinder and piston in the ground are measured by measuring the change in the condition of the ground soil where the front end of the cylinder / piston faces, by moving the wire linked to the displacement of the cylinder / piston or by supplying the pressure fluid supplied to the cylinder / piston. The ground condition detection device in the jet-type combined agitation method, which can measure the radius length from the rotary excavation axis at the front end position. 2. A method according to claim 1, further comprising at least one pair of radially mounted mechanical stirring blades spaced apart from each other in the axial direction with respect to the rotary excavation shaft, and jet nozzles installed outwardly near the stirring blade ends. The two high-pressure jets jetted from the nozzle intersect at a predetermined position in the ground outside the stirring area of the stirring blade to supply the solidified material into the ground.
In a jet-type combined agitation and excavation apparatus designed to be mixed, one of the agitating blades may include a radially expanding / contracting cylinder,
Pistons are juxtaposed, and the front end of the cylinder / piston extends at least beyond the rotation locus of the intersection of the high-pressure jet flows in the ground, and the state change of the ground soil facing the front end of the cylinder / piston can be measured. The ground condition detecting apparatus according to claim 1, wherein the ground state is detected by the jet-type combined stirring method. 3. The ground condition detecting device according to claim 1, wherein the cylinder / piston is mounted on a side following the excavation rotation direction of the stirring blade or inside the stirring blade. 4. The cylinder / piston is double-acting and has a telescopic structure, the length of which when fully retracted is approximately equal to or slightly less than the radial length of one stirring blade. The ground condition detecting device in the jet-type combined stirring method according to any one of claims 1 to 3, which is short.