JP4751819B2 - Non-open-cut soil improvement method directly under existing structures - Google Patents

Description

  The present invention relates to a non-cut soil improving method directly under an existing structure for easily improving the soil immediately under the existing structure, and particularly for purifying the contaminated soil.

  Conventionally, as shown in FIG. 27, there is a known non-open-cut soil improvement method directly under an existing structure for improving the soft ground layer 3 in the soil 2 located immediately below the existing structure 1 such as a building to a stable ground. (See, for example, Patent Document 1).

  In such a conventional apparatus, the ground surface of the one side surface 1a of the existing structure 1 is used as the start-side ground surface 4.

  A drill rod propulsion device 11 is placed on the start-side ground surface 4.

  And this drill rod propulsion apparatus 11 starts the drill rod 13 with which the drill head 12 was mounted | worn toward the reach | attainment side ground surface 5 located in the other side 1b of this existing structure 1 on the opposite side. It is configured.

  The drill head 12 has a built-in transmitter 14 that receives radio waves transmitted from the transmitter 14 on the ground and detects the depth and direction of the tip of the drill head 12. It is configured as follows.

  In addition, a signal for performing direction control is sent from the ground direction control device to the direction control mechanism via the receiver 15 provided in the drill head 12.

  After propelling the soft ground layer 3 directly below the existing structure 1 in the horizontal direction, the drill head 12 that has reached the reaching-side ground surface 5 is removed from the tip of the drill rod 13, and instead this drill rod One end of a flexible chemical injection pipe 8 such as a synthetic resin pipe is connected to the tip of 13.

  And the chemical | medical solution injection tube 6 connected integrally with this drill rod 13 is pulled back in the path | route which was excavated and propelled toward the said start side ground surface 4. FIG.

  The pulled back chemical solution injection pipe 6 is stopped in a state where a plurality of injection holes 6a formed in the central wall surface of the pipe are located in the soft ground layer 3 and is laid at a desired position.

  Next, using a supply hose 7, a chemical solution 10 such as a grout in the chemical solution tank 9 is pressure-injected into the chemical solution injection pipe 6 from the chemical solution supply device 8 placed on the arrival-side ground surface 5. The

  After the chemical solution injection tube 6 is filled, the chemical solution 10 is ejected into the soft ground layer 3 from the injection holes 6a around the chemical solution injection tube 6 located immediately below the existing structure 1.

  Next, the effect of the non-open-cutting soil improvement method directly under the existing structure of this conventional example will be described.

  In the conventional non-open-cutting soil improvement method directly under the existing structure constructed as described above, the chemical solution 10 ejected into the soft ground layer 3 is hardened in a state of being mixed with sand particles or the like in the soft ground layer 3. To do.

For this reason, it is not necessary to remove the existing structure 1, and the soft ground layer 3 in the soil 2 located directly under the existing structure 1 such as this building can be improved to a stable ground or the like.
Japanese Patent No. 3363099 (paragraphs 0017 to 0050, FIGS. 1 to 5)

  However, in the conventional non-open-cut soil improvement method directly under the existing existing structure, the transmitter 14 and the receiver 15 are built in the drill head 12, and the transmitter 14 and the receiver 15, A signal is transmitted / received to / from a transceiver such as a direction control device provided on the ground using radio waves or the like.

  For this reason, it is easy to be influenced by the disturbance of the electromagnetic waves around the existing structure 1, and it is difficult to specify the accurate depth and direction of the tip of the drill head 12.

  Further, a space for placing the drill rod propulsion device 11 is secured on the starting side ground surface 4 on the one side surface 1a of the existing structure 1, and a chemical solution is supplied to the reaching side ground surface 5 on the other side surface 1b. A space for placing the device 8 and the chemical tank 9 must be provided.

  In particular, the chemical solution injection pipe 6 is known to have a total length of about 50 m depending on the scale of the existing structure 1. These drill rod propulsion device 11, the chemical solution supply device 8, and the chemical solution tank 9 are also known. Is distributed on the start side ground surface 4 and the arrival side ground surface 5 on both sides of the existing structure 1, and the space for the work is increased, and it is difficult to say that the space efficiency is good. .

  Accordingly, the present invention has an object to provide a non-open-cut soil improvement method directly under an existing structure, in which the space efficiency of the work space is good and the soil improvement material can be accurately injected into a desired position in the ground. It is said.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the inside of the casing is hollow, the casing rod member is divided into a predetermined length and can be extended by connection, and the casing rod member The drill head member is provided with a front end mounting portion that is connected to a front end portion of the drilling direction and is mounted so that a front end surface of the drill plate member is inclined. By exchanging the direction of the plate member, the excavation step of controlling the traveling direction of the drill head member excavating the ground, and the rear end portion of the casing rod member, the front end portion of the subsequent other casing rod member Using a chemical injection pipe member to be inserted into the casing rod member toward the drill head member direction, the stretching step to be connected, and soil improvement A non-open-cut soil improvement method directly under an existing structure having an injecting step of injecting into the ground, and a stretching step of connecting a leading end portion of another casing rod member subsequent to the trailing end portion of the casing rod member Then, it is characterized by a non-open-cut soil improvement method directly under an existing structure that uses a three-dimensional measuring instrument to measure the position where the drill head member whose propulsion has been suspended temporarily in connection with the connection work.

  According to a second aspect of the present invention, in the extending step of connecting the rear end portion of the casing rod member to the front end portion of another subsequent casing rod member, the three-dimensional measurement is performed inside the casing rod member. A non-open-cut soil improvement method directly under an existing structure according to claim 1, wherein a tool is inserted to sequentially measure the arrival position of the drill head member in the ground.

  Further, according to a third aspect of the present invention, in the injection step, the tip portion of the chemical injection pipe member to be inserted into the casing rod member is attached to the excavation plate member attached to the drill head member. The chemical solution is directly injected into the ground from the tip portion of the chemical solution injection pipe member by abutting and detaching the excavation plate member from the front end mounting portion of the drill head member. It is characterized by a non-open-cut soil improvement method directly under existing structures.

  According to a fourth aspect of the present invention, in the injection step, after the excavation plate member is detached from the front end mounting portion of the drill head member, the drill head member and the casing rod member are injected with the chemical solution. The non-open-cut soil improving method directly under the existing structure according to claim 3, wherein the non-open-cut soil improving method is extracted from the periphery of the pipe member.

  And what was described in Claim 5 is the hollow inside inside formed in the said drill head member connected with the hollow inside of the said casing rod member by the imaging means provided in the said three-dimensional measuring device. 5. The rotation angle about the rotation axis about the axis of the drill head member is measured by imaging an angle confirmation mark provided on a part of the peripheral surface of the wall. 6. It is characterized by a non-open-cut soil improvement method directly under existing structures.

  Further, according to a sixth aspect of the present invention, there is provided a hollow inner inner side formed in the drill head member that is provided with a groove at the tip of the three-dimensional measuring instrument and communicates with the hollow inner portion of the casing rod member. 6. The rotation angle about the rotation axis about the axis of the drill head member is measured by engaging the groove with an angle confirmation mark protruding from the peripheral surface of the wall. It is characterized by a non-open-cut soil improvement method directly under the existing structure described in the above item.

  In the invention according to claim 1 configured as described above, in the extending process of the casing rod member divided into a plurality of parts, the reaching position in the ground of the drill head member in which the propulsion is temporarily stopped is associated with the connection work. A three-dimensional measuring instrument is used and measured.

  Since the casing rod member is divided into fixed lengths, the position where the drill head member reaches in the ground is connected to the rear end portion of the casing rod member and the front end portion of another subsequent casing rod member. By performing each operation to be performed, in the propulsion direction, the arrival position on the three-dimensional coordinate for each substantially constant traveling direction dimension is accurately detected.

  In addition, according to a second aspect of the present invention, a three-dimensional measurement is performed inside the casing rod member in an extending step of connecting a leading end portion of another subsequent casing rod member to the trailing end portion of the casing rod member. A tool is inserted, and the arrival position of the drill head member in the ground is sequentially measured.

  After the measurement, since the three-dimensional measuring instrument can be extracted from the inside of the casing rod member, when performing a drilling process by the drill head member, the three-dimensional measuring instrument is not affected by vibration or disturbance of radio waves. There is no fear of being given.

  For this reason, the arrival position is detected more accurately.

  Further, according to a third aspect of the present invention, in the injection step, a tip end portion of the chemical solution injection pipe member inserted into the casing rod member projects into the excavation plate member attached to the drill head member. When applied, the excavation plate member is detached from the front end mounting portion of the drill head member.

  For this reason, the chemical liquid can be directly injected into the ground directly from the tip of the chemical liquid injection pipe member, and the chemical liquid remains in the hollow space inside the casing rod member or the drill head member. There is no fear.

  In addition, by inserting the tip of the inserted pipe into the hollow space inside the casing rod member or drill head member, such as the tip of the chemical injection pipe member, and then pulling it back, Sampling of soil such as soil is possible.

  According to a fourth aspect of the present invention, in the injection step, after the excavation plate member is detached from the front end mounting portion of the drill head member, the drill head member and the casing rod member are injected with the chemical solution. It is extracted from the periphery of the pipe member.

  Since the drilling plate member is detached from the front end mounting portion of the drill head member, the drill head member and the casing rod member can be smoothly extracted without interfering with the distal end portion of the chemical injection pipe member. I can do it.

  For this reason, the drill head member and the casing rod member can be recovered on the ground and reused.

  And what was described in Claim 5 is the hollow inside inside formed in the said drill head member connected with the hollow inside of the said casing rod member by the imaging means provided in the said three-dimensional measuring device. An angle confirmation mark provided on a part of the peripheral surface of the wall is imaged, and a rotation angle about the axis of the drill head member as a rotation center is measured.

  Therefore, the traveling direction of the drill head member excavating in the ground is controlled by changing the orientation of the drill plate member with respect to the propulsion amount of the drill head member based on the measured rotation angle. It becomes possible.

  According to a sixth aspect of the present invention, there is provided a hollow interior formed in the drill head member that communicates a groove provided at a tip of the three-dimensional measuring instrument with the hollow interior of the casing rod member. Engage with an angle confirmation mark protruding from the peripheral surface of the inner wall.

  For this reason, since the rotation angle about the axis of the drill head member coincides with the rotation angle of the three-dimensional measuring instrument, by measuring the rotation angle of the three-dimensional measuring instrument, The rotation angle with the axis of the drill head member as the rotation center can be measured.

  Therefore, the traveling direction of the drill head member excavating in the ground can be further changed by changing the direction of the drill plate member relative to the propulsion amount of the drill head member based on the measured rotation angle. However, control becomes possible.

  Next, based on the drawings, a non-open-cut soil improving method directly under an existing structure according to the best mode for carrying out the present invention will be described.

  FIG. 1 thru | or FIG. 21 shows the non-open cut soil improvement construction method just under the existing structure of embodiment of this invention. In addition, the same code | symbol is attached | subjected and demonstrated about the same thru | or equivalent part as the said conventional.

  First, from the configuration, in the non-open-cut soil improvement method directly under the existing structure of this embodiment, the ground 15 in the soil 2 located directly under the existing structure 1 such as a building is improved. This is a non-open-cut soil improvement method directly under an existing structure for improving the ground when contaminated soil 16 is included.

  As shown in FIG. 1, a ground surface of one side 1 a of the existing structure 1 is used as a start side ground surface 4, and a drill rod propulsion device 11 is placed on the start side ground surface 4. Has been.

  As shown in FIG. 3, the drill rod propulsion device 11 includes a carriage 18 that can travel on the ground surface by a traveling device including a caterpillar 11 a and the like.

  A slide rail member 19 having racks 19 a and 19 a on the left and right side portions is provided on the upper surface side of the carriage 18 along the longitudinal direction over substantially the entire length of the carriage 18 in the front-rear direction.

  A rod propulsion device 20 and a pull-out carriage device 30 are mainly mounted on the slide rail member 19 so as to be slidable along the longitudinal direction.

  Among these, as shown in FIG. 4, the rod propulsion device 20 includes a guide roller member that contacts the upper and lower surfaces of the slide rail member 19 in a substantially hollow box-like moving box 20 a. 22 and 22 are provided.

  A pair of left and right moving motors 23, 23 are provided inside the moving box 20a.

  A controller (not shown) is connected to the moving motors 23 and 23, and the motor shafts 23a and 23a are driven to rotate by a control output signal from the controller.

  The motor shafts 23a, 23a of the moving motors 23, 23 are provided with pinion gears 24, 24 that mesh with the racks 19a, 19a of the slide rail member 19, respectively.

  The rod propulsion device 20 is configured to be slid along the slide rail member 19 by rotational driving of the motor shaft portions 23a and 23a of the moving motors 23 and 23.

  Further, the rod propulsion device 20 is provided with a bottomed substantially cylindrical rod receiving member 25 so as to be rotatable. The rod receiving member 25 is mounted with casing rod members 17 that are hollow and are divided into a predetermined length and can be extended by connection.

  That is, the rod receiving member 25 has a bowl-shaped concave portion 25a into which the rear end portion 17a of the casing rod member 17 is inserted as shown in FIG.

  The taper that enables the plurality of casing rod members 17 to be connected to the inner wall surface of the concave portion 25a by being threadedly engaged with a female screw portion 17d formed at the distal end portion 17c of the casing rod member 17. A female screw portion 25b is provided which is fixed by screwing a male screw portion 17b formed on the outer peripheral surface of the rear end portion 17a.

  An annular rack portion 25 c is formed on the outer peripheral surface of the rod receiving member 25 over the entire circumference.

  Furthermore, as shown in FIG. 4, a rotation drive motor 26 is provided inside the moving box 20a.

  The rotational drive motor 26 is configured to rotationally drive the motor shaft portion 26a by a rotation angle control output signal from a control unit (not shown).

  Further, a pinion gear 27 that meshes with an annular rack portion 25 c formed on the outer peripheral surface of the rod receiving member 25 is provided on the motor shaft portion 26 a of the rotary drive motor 26.

  Then, by rotating the motor shaft portion 26a of the rotation drive motor 26, the rotation of the drill head member 50 connected to the distal end portion 17c of the casing rod member 17 in the excavation direction with respect to the rod propulsion device 20 is rotated. The moving angle is adjusted while being rotationally driven, and the rod propulsion device 20 is moved along the slide rail member 19 so that the rear end portions 17a of these casing rod members 17 are pressed. And is configured to propel underground.

  In this embodiment, as shown in FIG. 7, the longitudinal length L1 of the casing rod member 17 is set to L1 = about 3 m. In addition, the outer diameter D1 of the front end portion 17c and the rear end portion 17a is about 200 mm, respectively, and the inner diameter dimension D2 of the hollow portion is set to be about 65 mm.

  Further, as shown in FIGS. 5 and 6, the pull-out carriage device 30 includes a carriage body 31 that is slidably mounted on the upper surface of the slide rail member 19 along the slide rail member 19, and Guide plate members 32, 32 provided along both side surfaces of the carriage body 31, and two upper and lower pairs of the guide plate members 32, 32, respectively, are provided so as to be freely rotatable, and slide rail members. Guide roller members 22 and 22 are provided on both upper and lower surfaces of 19 so as to be able to roll.

  A pair of left and right thrust hydraulic motors 34 are provided on the upper portion of the carriage body 31.

  A control unit (not shown) is connected to the thrust hydraulic motors 34 and 34, and the motor shaft units 34a and 34a are driven to rotate by a control output signal from the control unit.

  Further, pinion gears 35, 35 that respectively mesh with the racks 19 a, 19 a of the slide rail member 19 are provided on the motor shaft portions 34 a, 34 a of the thrust hydraulic motor 34.

  The pull-out carriage device 30 is slid along the slide rail member 19 by the rotational drive of the motor shaft portions 34a, 34a of the thrust hydraulic motor 34.

  Further, the pull-out carriage device 30 is placed on the upper surface of the plate-like pedestal 37 between the guide plate members 32, 32 in front of the carriage body 31, and the rear end portion 17a of the casing rod member 17 is provided. A gear box member 36 is provided for connecting and pulling out the casing rod members 17 from the ground as the pulling carriage device 30 moves.

  That is, the gear box member 36 has a central axis with respect to the receiving member 37 in which the female screw portion 37a for screwing the male screw portion 17b formed in the rear end portion 17a of the casing rod member 17 is formed. It has the rotating cylinder member 38 integrally formed as a common.

  Further, shaft hole portions 36c and 36d are formed in the front and rear wall surface portions 36a and 36b of the gear box member 36, respectively, and the substantially central portion and the rear end portion of the inserted rotating cylinder member 38 are rotated. The receptacle member 37 is slidably supported so as to be freely supported, and the receiving port member 37 protrudes forward from the front wall surface portion 36 a of the gear box member 36.

  Further, a reduction gear member 40 is integrally provided on the outer peripheral surface of the rotating cylinder member 38 and is configured to rotate with the rotation of the rotating cylinder member 38.

  The gear box member 36 is provided with a rotary hydraulic motor 39 above the shaft hole portion 36c of the front wall surface portion 36a.

  The rotary hydraulic motor 39 is configured such that the motor shaft portion 39a is rotationally driven by a rotational drive output signal from a control unit (not shown).

  Further, a pinion gear 41 that meshes with the reduction gear member 40 is provided on the motor shaft portion 39 a of the rotary hydraulic motor 39.

  The pull-out carriage device 30 is operated by the slide rail member while the casing rod member 17 and the drill head member 50 are rotated around the shaft by the rotational drive of the motor shaft portion 39a of the rotary hydraulic motor 39. The casing rod member 17 and the drill head member 50 can be pulled out from the ground to the ground by being moved along the arm 19.

  Next, the configuration of the drill head member 50 of this embodiment will be described in detail with reference to FIGS.

  First, the overall configuration will be described. In the drill head member 50 of this embodiment, as shown in FIG. 9, the length dimension in the longitudinal direction of the drill head member 50 is set to L2 = about 1.8 m. ing.

  The outer diameter D3 of the drill head member 50 is set to about 200 mm so as to be substantially the same as the outer diameter D1 of the front end portion 17c and the rear end portion 17a of the casing rod member 17.

  The rear end portion 50a has a taper shape substantially the same as the taper shape of the rear end portion 17a of the casing rod member 17, and a male screw portion 50b is formed on the outer peripheral surface. The member 17 is configured to be connectable by being screwed into the female screw portion 17d of the tip portion 17c in the digging direction.

  Further, the inner diameter D4 of the hollow portion inside the drill head member 50 is set to be about 65 mm.

  Further, the drill head member 50 is formed to be curved so that the central axis has a predetermined angle α = about 1 to 1.2 ° toward the front end 50d.

  A drilling plate member 60 is attached to the front end 50 d of the drill head member 50.

  This excavation plate member 60 has a plate body 62 having a substantially elliptical shape in plan view and a cylindrical plug body 61, and is mainly configured.

  Then, the front end mounting portion 50e of the front end portion 50d of the drill head member 50 inclines the end surface orthogonal to the axial direction so that the front end surface 62a of the plate body 62 is inclined (inclination angle = about 45-50). °) and is formed obliquely.

  For this reason, when this drill head member 50 is propelled in the ground, the earth pressure can press the front end surface 60a and change the propulsion direction of the drill head member 50.

  Therefore, in the excavation process, the rod propulsion device 20 excavates the ground by changing the direction of the excavation plate member 60 with respect to the propulsion amount of the drill head member 50 by the rotational drive of the rotary drive motor 26. The traveling direction of the drill head member 50 can be controlled.

  Further, the excavation plate member 60 is provided with a cylindrical plug body 61 fitted from the front end opening 50f in a hollow portion formed in the drill head member 50, and the plate main body 62 is The fasteners 63 and 63 are integrally fixed.

  The cylindrical plug body 61 is provided with a mud check valve 64.

  As shown in FIG. 11, the muddy water check valve 64 communicates the outlet side opening 64b to the outside through a lubricating liquid passage 64a formed through the cylindrical plug body 61 and the plate body 62. In addition, the casing rod member 17 and an inlet side opening 64c facing the hollow space inside the drill head member 50 are provided.

  Further, the mud check valve 64 is associated with the excavation work by the operation of the valve body 64d provided so as to be freely movable in the chamber 64e formed between the outlet side opening 64b and the inlet side opening 64c. Thus, the lubricating liquid flowing in from the inlet side opening 64c can be discharged to the outside from the outlet side opening 64b, and intrusion of external muddy water from the outlet side opening 64b is prevented. ing.

  In addition, ring-shaped seal members 65, 65 are provided around the cylindrical plug body 61 so as to be double.

  By the ring-shaped seal members 65, 65, the lubricating liquid in the hollow space inside the drill head member 50 is sealed so as not to leak to the outside.

  Further, in this embodiment, a plurality of pin receiving holes 50g... Are recessed and formed in the front end mounting portion 50e located at the peripheral edge of the front end opening 50f with a certain interval.

  Split pins 66 are respectively fitted in the pin receiving holes 50g in a half-inserted state.

  In the excavation plate member 60, pin holes 62b are formed at positions corresponding to the pin receiving members 50g.

  9 and 10, the projecting portions of the split pins 66 are inserted into and locked into the pin holes 62b, so that the front end surface of the plate body 62 of the excavation plate member 60 is obtained. The excavation plate member 60 is detachable so that 62a is parallel to the end surface of the front end mounting portion 50e and is inclined at a predetermined angle, for example, 25 ° to 45 ° with respect to the excavation direction. It is attached to.

  For this reason, in the excavation process to be described later, the direction of the excavation plate member 60 relative to the propulsion amount of the drill head member 50 is adjusted by rotating the rod receiving member 25 during propulsion using the rod propulsion device 20. The drill for excavating the ground by changing the direction of the earth pressure reaction force of the front end face 62a by changing the rotation angle of the drill head member 50 about the axis together with the casing rod member 17. The traveling direction of the head member 50 is configured to be controllable.

  Next, with respect to the effects of the non-open-cutting soil improvement method directly under the existing structure of this embodiment, using the flowchart shown in FIG. 17 and the schematic work diagrams shown in FIGS. It explains along.

  First, at Step 1 in FIG. 17, as shown in FIG. 18, the drill rod propulsion device 11 as a drill unit is installed on the start-side ground surface 4 existing on the one side surface 1 a of the existing structure 1.

  In Step 2, a female screw portion 17d formed at the tip portion 17c of the casing rod member 17 is screwed into a male screw portion 50b formed at the rear end portion 50a of the drill head member 50, and the length in the propulsion direction is increased. Accordingly, the female screw portion 17d formed at the front end portion 17c of the subsequent casing rod member 17 is appropriately screwed with the male screw portion 17b formed at the rear end portion 17a of the preceding casing rod member 17. Let them connect.

  At this time, as shown by a two-dot chain line in FIG. 3, the rod propulsion device 20 of the drill rod propulsion device 11 is brought close to the pulling carriage device 30 provided on the left side of the slide rail member 19 and retracted. In the retracted position, as shown in FIG. 4, the male threaded portion 17 b formed in the rear end portion 17 a of the casing rod member 17 located at the rearmost end is formed in the rod receiving member 25 of the rod propulsion device 20. The female screw part 25b is screwed and fixed.

  In Step 3, the drill head member 50 penetrates into the ground, and in Step 4, the moving motors 23 and 23 in the moving box body 20 a are driven to rotate so that the upper and lower surfaces of the slide rail member 19 are both upper and lower. The rod propulsion device 20 is slid to a position indicated by a solid line in FIG. 3 while rolling the guide roller members 22 and 22 that are in contact with each other so that the motor shaft portion 26a of the rotary drive motor 26 is moved. Drilling is performed by rotationally driving the rod receiving member 25 to rotate.

  In this embodiment, when the rod propulsion device 20 is slid to the position shown by the solid line in FIG. 3, the rear end portion 17a of the casing rod member 17 is pressed by the rod receiving member 25, The propulsive force required for excavation into the ground is given, and the drill head member 50 connected to the casing rod members 17 is also rotated by the rotational drive of the rotational drive motor 26.

  For this reason, the drill head member 50 can be easily propelled in the ground.

  In Step 5, until the propulsion proceeds 3 m, the process returns to Step 4 and continues drilling.

  In this embodiment, the movement length of the rod propulsion device 20 out of the total length of the slide rail member 19 coincides with the longitudinal length dimension L1 of the casing rod member 17 = about 3 m, It can be seen that the moving box 20a has advanced by 3 m by being propelled from the retracted position indicated by the two-dot chain line in FIG. 3 to the drilling end position positioned at the right side in the figure as indicated by the solid line.

  Then, when the propulsion has advanced by 3 m, the process proceeds to the next Step 6 and the drilling is stopped, and at Step 7, the three-dimensional measurement of the drill head member 50 in which the propulsion is temporarily stopped is started along with the connecting work. The

  In this embodiment, a three-dimensional measuring instrument 70 as shown in FIGS. 13 to 16 is used for three-dimensional measurement of the path propelled by the drill head member 50.

  In the position measurement of the drill head member 50 using the three-dimensional measuring instrument 70 of this embodiment, the rear end portion of the casing rod member 17 is at the drilling end position where the rod propulsion device 20 is located on the right side in FIG. Before performing the extending | stretching process which connects the front-end | tip part 17c of the other other casing rod member 17 to 17a, the said three-dimensional measuring device 70 is made into the hollow part inside from the rear-end part 17a side of the said casing rod member 17. 19 to reach the inside of the hollow portion in the drill head member 50 as shown in FIG.

  At this time, as shown in FIG. 1 or FIG. 13, the CCD camera 71 provided on the tip surface of the three-dimensional measuring instrument 70 is illuminated by the LED rides 72, 72 provided in the periphery, An angle confirmation mark 100 provided on the inner wall of the drill head member 50 is imaged (see FIGS. 1 and 2).

  The captured image data is displayed on the monitor 79 on the PC 78 via the cable 76 and the data logger 77 (see FIG. 1).

  An operator looks at the image of the monitor 79 on the PC 78 on which image data as shown in FIG. 2 is displayed, and when the angle confirmation mark 100 is displayed, the three-dimensional measuring instrument 70 It can be confirmed by visual recognition that the hollow portion inside the drill head member 50 has been reached.

  Next, the position of the drill head member 50 is measured by the three-dimensional measuring instrument 70.

  As shown in FIG. 14, the three-dimensional measuring instrument 70 of this embodiment has an outer diameter of about 60 mm in diameter and a total length of about 1.5 m, and measures the yaw angle θ2 around the Z axis that is the vertical rotation axis. A yaw angle sensor 73, a pitch angle sensor 74 for measuring the pitch angle θ1 around the Z1 axis that is the horizontal rotation axis, and a roll angle sensor 75 for detecting the roll angle α are configured using an acceleration sensor or the like. Yes.

  Then, using the measured three yaw angles θ2, pitch angle θ1 and roll angle α with respect to the reference point 101, the position of the tip end portion 70a is calculated and pulled out within the path every 1.5 m. By repeating the measurement, the bending of the excavated route can be detected.

  Further, in this embodiment, a hollow inner inner side formed in the drill head member 50 communicating with the hollow inner portion of the casing rod member 17 by a CDD camera 71 provided in the three-dimensional measuring instrument 70. An angle confirmation mark 100 provided on a part of the peripheral surface of the wall that coincides with the angle at which the cutter blade 67a at the tip is attached is imaged, so that the axis of the drill head member 50 is pivoted. The rotation angle can be easily measured.

  For this reason, the rotation provided in the rod propulsion device 20 so that the drill head member 50 advances in a desired direction when excavation is performed again after connecting the subsequent casing rod member 17. By rotating the drive motor 26, the direction in which the front end face 62a of the plate body 62 is inclined obliquely can be accurately changed.

  In Step 8, the extending process in which the rear end portion 17a of the subsequent casing rod member 17 is connected to the rear end portion 17a of the casing rod member 17, the drill head member 50 is directly below the existing structure 1. Excavation propulsion is repeated until a target position in the contaminated soil 16 is reached.

  In Step 9, the drill bit is released. That is, when the drill head member 50 reaches the target position, as shown in FIG. 20, the chemical liquid injection pipe member 80 is inserted from the rear end side of the most subsequent casing rod member 17, and FIG. As shown in FIG. 2, the tip 80a is abutted against the rear end surface 61a of the cylindrical plug body 61 of the excavation plate member 60 mounted on the drill head member 50, and the excavation plate member 60 is connected to the drill head member 50. Is detached from the front end mounting portion 50e.

  For this reason, in Step 10, the distal end portion 80a of the chemical solution injection pipe member 80 is directly inserted into the contaminated soil 16, and in the injection step described later, from the distal end portion 80a of the chemical solution injection pipe member 80, For example, a chemical solution (soil improving material) that neutralizes the contaminated soil can be injected into the ground.

  In Step 11, the pulling carriage device 30 of the drill rod propulsion device 11 is used, and only the drill head member 50 from which the casing rods 17 and the excavation plate member 60 are detached is collected.

  That is, the pulling carriage device 30 is moved on the slide rail member 19 of the drill rod propulsion device 11 shown in FIG. 3 in the vicinity of the rod propulsion device 20 on the right side in the drawing, and shown in FIGS. As described above, the male screw portion 17 b formed at the rear end portion 17 a of the most subsequent casing rod member 17 is screwed to the female screw portion 37 a of the receiving member 37 and fixed.

  Next, the thrust hydraulic motors 34 and 34 are driven to rotate, and the pulling carriage device 30 is moved along the slide rail member 19 in the left direction in FIG. As described above, the drill head member 50 and the casing rod members 17 are extracted from the periphery of the chemical injection pipe member 80.

  The drill head member 50 and the casing rod member 17 ... interfere with the distal end portion 80a of the chemical injection pipe member 80 because the excavation plate member 60 is detached from the front end mounting portion 50e of the drill head member 50. It can be extracted smoothly without any problems.

  At this time, the rotary hydraulic motor 39 is rotationally driven to apply a rotational force to the casing rod members 17 and the drill head member 50, whereby the pulling operation can be performed more easily.

  For this reason, the drill head member 50 and the casing rod members 17 are collected on the ground and reused.

  In this embodiment, in order to improve a wide range of contaminated soil 16, a plurality of the chemical solution injection pipe members 80... Left in the ground as shown in FIG. 23, the chemical solution 10 as a soil conditioner in the chemical solution tank 9 is supplied from the chemical solution supply device 8 placed on the starting-side ground surface 4 through the supply hose 7 to the chemical solution injection pipe member 80. ... pressure is injected into the interior, and the soil improvement work is completed at Step 13.

  In this embodiment, a path formed by excavation is accurately formed by the drill head member 50, so that a plurality of chemical solution injection pipe members 80. Even in the case of embedding, the soil can be improved with good chemical injection efficiency.

  As described above, in the non-open-cut soil improvement method directly under the existing structure of this embodiment, in the extending process of the casing rod member 17 divided into a plurality of pieces, the propulsion was temporarily stopped along with the connecting work. The arrival position of the drill head member 50 in the ground is measured using a three-dimensional measuring instrument 70.

  Since the casing rod member 17 is divided into a certain length, the position where the drill head member 50 reaches in the ground is moved to the rear end portion 17a of the casing rod member 17 and the other casing rod member 17 following it. By performing each operation for connecting the leading end portions 17c, in the propulsion direction, the arrival position on the three-dimensional coordinates for each substantially constant traveling direction dimension is accurately detected.

  Further, a three-dimensional measuring instrument 70 is inserted into the casing rod member 17 in an extending step of connecting the leading end portion 17c of the other casing rod member 17 to the rear end portion 17a of the casing rod member 17. Then, the reaching position of the drill head member 50 in the ground is sequentially measured.

  After the measurement, since the three-dimensional measuring instrument 70 can be extracted from the inside of the casing rod member 17, when performing the excavation process by the drill head member 50, the three-dimensional measuring instrument 70 is subjected to vibration and radio waves. There is no risk of being affected by disturbance.

  For this reason, the arrival position is detected more accurately.

  Further, in the injection step, the distal end portion of the chemical solution injection pipe member 80 inserted into the casing rod member 17 is disposed behind the cylindrical plug body 61 of the excavation plate member 60 attached to the drill head member 50. The excavation plate member 60 is separated from the front end mounting portion 50e of the drill head member 50 by being abutted against the end surface 61a.

  For this reason, the chemical solution 10 can be injected directly into the ground from the distal end portion 80a of the chemical solution injection pipe member 80 in the vicinity of the reaching position, and the hollow inside the casing rod member 17 or the drill head member 50 can be obtained. There is no possibility that the chemical solution 10 will remain in the space.

  Further, the tip of the pipe inserted into the hollow space inside the casing rod member 17 or the drill head member 50, such as the tip 80a of the chemical injection pipe member 80, is inserted into the ground, and again When pulled back, it becomes possible to sample soil in the ground such as contaminated soil.

  Further, in the injection step, after the excavation plate member 60 is detached from the front end mounting portion 50e of the drill head member 50, the drill head member 50 and the casing rod member 17 are removed from the periphery of the chemical injection pipe member 80. Extracted.

  The drill head member 50 and the casing rod member 17 interfere with the distal end portion 80a of the chemical solution injection pipe member 80 because the excavation plate member 60 is detached from the front end mounting portion 50e of the drill head member 50. And can be pulled out smoothly.

  For this reason, the drill head member 50 and the casing rod member 17 can be easily recovered on the ground and reused.

  Then, a CCD camera 71 provided in the three-dimensional measuring instrument 70 is used to provide a peripheral surface of the hollow inner inner wall formed in the drill head member 50 that communicates with the hollow interior of the casing rod member 17. The angle confirmation mark 100 provided in the part is imaged, and the rotation angle about the axis of the drill head member 50 is measured.

  For this reason, by changing the direction of the excavation plate member 60 with respect to the propulsion amount of the drill head member 50 based on the measured rotation angle, the traveling direction of the drill head member 50 excavating in the ground is changed. It becomes controllable.

  The drill rod propulsion device 11 and the chemical solution supply device 8 can be placed only on the starting side ground surface 4 on one side of the existing structure 1, and the chemical solution injection pipe 80 is also a long object. Construction can be performed using the same work space as the casing rod member 17.

  For this reason, the space efficiency is good, and it is not necessary to remove the existing structure 1 and the soil improvement material can be accurately injected into a desired position in the ground. Construction methods are provided.

  FIGS. 24 to 26 show a three-dimensional measuring instrument 170 used in the non-open-cutting soil improvement method directly under an existing structure of Example 1 of the embodiment of the present invention.

  In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as the three-dimensional measuring device 70 of the said embodiment.

  First, the differences in configuration will be mainly described. In the three-dimensional measuring instrument 170 according to the first embodiment, a single groove 70b is formed in the distal end portion 70 from the front end surface to the outer peripheral surface. .

  As shown in FIG. 26, the groove 70b is configured to engage with an angle confirmation mark 100 protruding from the peripheral surface of the hollow inner inner wall of the drill head member 50.

  In the engaged state, the rotation angle about the rotation axis of the drill head member is configured to coincide with the rotation angle of the three-dimensional measuring instrument 170.

  Next, the function and effect of Example 1 of this embodiment will be described.

  In the three-dimensional measuring instrument 170 of Example 1, in addition to the operational effects of the above embodiment, in order to confirm the position of the drill head member 50 in the ground, as shown in FIG. The three-dimensional measuring instrument 170 is inserted into the internal space of the drill head member 50 connected to the member 17.

  Then, the groove 70b formed in the distal end portion 70a of the three-dimensional measuring instrument 170 is engaged with the angle confirmation mark 100 that protrudes inward from the peripheral surface of the inner wall.

  For this reason, since the rotation angle of the drill head member 50 and the rotation angle of the three-dimensional measuring instrument 170 coincide with each other, by measuring the rotation angle of the three-dimensional measuring instrument 170, the drill head member It is possible to easily measure the rotation angle about the axis of the rotation.

  Therefore, the traveling direction of the drill head member 50 excavating the ground by changing the direction of the drilling plate member 60 with respect to the propulsion amount of the drill head member 50 based on the measured rotation angle can be further simplified. Can be controlled.

  Other configurations and operational effects are substantially the same as those of the above-described embodiment, and thus description thereof is omitted.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  That is, in the said embodiment, although the soil improvement material which neutralizes contaminated soil and improves the soil as a chemical | medical solution 10 was demonstrated and demonstrated as a soil improvement material, it is not restricted to this in particular, For example, Naturally, a chemical solution 10 such as grout for improving the soft ground layer 3 may be used.

  Further, in the embodiment, the columnar plug of the excavation plate member 60 in which the chemical solution injection pipe member 80 is inserted and the distal end portion 80a is attached to the drill head member 50 as shown in FIG. 61 is configured to be abutted against the rear end surface 61a of the drill head member 61 and to be detached from the front end mounting portion 50e of the drill head member 50. The front end portion or the front end portion of another rod-shaped member is abutted against the rear end surface 61 a of the cylindrical plug body 61 of the drilling plate member 60 mounted on the drill head member 50, and the front end mounting portion of the drill head member 50 The excavation plate member 60 may be detached from 50e.

FIG. 2 is a partial cross-sectional view for explaining the overall configuration and an enlarged cross-sectional view of a three-dimensional measuring instrument in a non-open-cut soil improvement method directly under an existing structure according to the best embodiment of the present invention. It is a top view which shows an example of a monitor screen by the non-open cutting soil improvement construction method directly under the existing structure of embodiment. It is a side view explaining the structure of the drill rod propulsion apparatus used for the non-open-cutting soil improvement construction method just under the existing structure of embodiment. It is an internal permeation | transmission partial cross section side view explaining the structure of a rod propulsion apparatus among the drill rod propulsion apparatuses used for the non-open-cutting soil improvement construction method just under the existing structure of embodiment. It is a top view explaining the structure of the extraction carriage apparatus among the drill rod propulsion apparatuses used for the non-open cutting soil improvement construction method directly under the existing structure of the embodiment. It is a partial cross section side view explaining the composition of an extraction carriage device among drill rod propulsion devices used for the non-open-cutting soil improvement construction method just under the existing structure of an embodiment. It is a partial cross section side view explaining the composition of the casing rod member used for the non-open cut soil improvement construction method just under the existing structure of an embodiment. It is a front view of the drill head member used for the non-open cutting soil improvement construction method just under the existing structure of embodiment. It is a longitudinal direction sectional view of the drill head member used for the non-open cutting soil improvement construction method just under the existing structure of an embodiment. It is a longitudinal cross-sectional view explaining a mode that a drilling plate member detaches | leaves with the drill head member used for the non-open cutting soil improvement construction method just under the existing structure of embodiment. It is a drill head member used for the non-open-cutting soil improvement method just under the existing structure of an embodiment, and explains the composition of the principal part, and is a longitudinal direction sectional view near the front end attachment part to which the excavation plate member is attached. It is a drill head member used for the non-open cutting soil improvement method just under the existing structure of an embodiment, the composition of the principal part is explained and it is a bottom view near the front end installation part with which the excavation plate member was installed. It is a side view of the three-dimensional measuring device used for the non-open-cut soil improvement construction method directly under the existing structure of the embodiment. It is a schematic diagram explaining the structure of the three-dimensional measuring device used for the non-open-cutting soil improvement construction method just under the existing structure of embodiment. It is a schematic diagram explaining the measurement principle of the three-dimensional measuring instrument used for the non-open-cutting soil improvement construction method just under the existing structure of embodiment. It is a schematic diagram explaining the measurement principle of the three-dimensional measuring instrument used for the non-open-cutting soil improvement construction method just under the existing structure of embodiment. It is a flowchart figure explaining a construction procedure by the non-open cutting soil improvement construction method just under the existing structure of embodiment. It is typical underground sectional drawing explaining a mode that excavation by a drill head is carried out by the non-open cutting soil improvement construction method directly under the existing structure of an embodiment. It is typical underground sectional drawing explaining a mode that the position of a drill head is measured with a three-dimensional measuring device by the non-open cutting soil improvement construction method just under the existing structure of embodiment. It is typical underground sectional drawing explaining a mode that an excavation plate member is made to detach | leave at the front-end | tip part of a chemical | medical solution injection pipe by the non-open cutting soil improvement construction method just under the existing structure of embodiment. It is typical underground sectional drawing explaining a mode that a drill head member and a casing rod member are pulled out by the non-open cutting soil improvement construction method just under the existing structure of an embodiment. It is typical underground sectional drawing explaining a chemical | medical solution injection | pouring pipe member being embed | buried in the underground by the non-open cutting soil improvement construction method directly under the existing structure of embodiment. It is typical underground sectional drawing explaining a mode that a chemical | medical solution is inject | poured using a chemical | medical solution injection | pouring pipe member by the non-open cutting soil improvement construction method directly under the existing structure of embodiment. It is the whole side view explaining the structure of the three-dimensional measuring device used for the non-open-cutting soil improvement construction method directly under the existing structure of Example 1 of embodiment. It is a three-dimensional measuring device used for the non-open cutting soil improvement method just under the existing structure of Example 1 of an embodiment, and is an enlarged top view explaining composition of a tip part. It is a longitudinal cross-sectional view which shows a mode that the three-dimensional measuring device was inserted in the drill head member by the non-open cutting soil improvement construction method just under the existing structure of Example 1 of an embodiment. It is a typical sectional view explaining the whole composition which requires work space on both sides of an existing structure by the non-open cut soil improvement construction method just under the existing structure of a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Drill rod propulsion apparatus 15 Ground 16 Contaminated soil 17 Casing rod member 20 Rod propulsion apparatus 30 Pull-out carriage apparatus 50 Drill head member 60 Drilling plate member 70 Three-dimensional measuring instrument 71 Imaging means 80 Chemical solution injection pipe member 80a Tip part 100 For angle confirmation Placemark

Claims (6)

The interior of the casing rod member is hollow, and is divided into a certain length and can be extended by connection. The casing rod member is connected to the tip of the casing rod member in the digging direction, and the front end surface of the digging plate member is inclined. The drill head that excavates in the ground by changing the direction of the excavation plate member with respect to the propulsion amount of the drill head member using a drill head member provided with a front end mounting portion mounted so as to be An excavation step for controlling the advancing direction of the member, an extending step for connecting a leading end portion of another subsequent casing rod member to the rear end portion of the casing rod member, and the casing rod toward the drill head member direction. An injection process for injecting a soil amendment material into the ground using a chemical injection pipe member to be inserted inside the member. A cutting soil improvement method,
In the extending step of connecting the tip of the subsequent casing rod member to the rear end of the casing rod member, the reaching position in the ground of the drill head member in which propulsion has been temporarily stopped is associated with the connecting operation. A non-open-cut soil improvement method directly under an existing structure, characterized by using a three-dimensional measuring instrument.   In the extending step of connecting the tip of the subsequent casing rod member to the rear end of the casing rod member, a three-dimensional measuring instrument is inserted into the casing rod member, and the ground of the drill head member is inserted. The non-open-cut soil improvement method directly under an existing structure according to claim 1, wherein the reaching position inside is sequentially measured.   In the injection step, the tip of the chemical solution injection pipe member inserted into the casing rod member is abutted against the excavation plate member mounted on the drill head member, and the excavation plate member is The chemical solution is directly injected into the ground from the tip end portion of the chemical solution injection pipe member by detaching from the front end mounting portion of the head member. Open soil improvement method.   In the injection step, the drilling plate member and the casing rod member are extracted from the periphery of the chemical injection pipe member after the excavation plate member is detached from the front end mounting portion of the drill head member. A non-open-cut soil improvement method directly under an existing structure according to claim 3.   An angle provided on a part of the peripheral surface of the hollow inner inner wall formed in the drill head member communicating with the hollow interior of the casing rod member by the imaging means provided in the three-dimensional measuring instrument 5. The rotation angle with the axis of the drill head member as a rotation center is measured by taking an image of the confirmation mark, and immediately below the existing structure according to claim 1. Non-open cut soil improvement method. An angle confirmation is provided by providing a groove at the tip of the three-dimensional measuring instrument and projecting from the peripheral surface of the hollow inner inner wall formed in the drill head member communicating with the hollow interior of the casing rod member. The existing structure according to any one of claims 1 to 5, wherein a rotation angle with the axis of the drill head member as a rotation center is measured by engaging the groove with a mark. Non-open cut soil improvement method directly under the object.

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