JP3904779B2 - Ground improvement type anchor method and ground improvement combined drilling machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground improvement type anchor construction method for constructing an anchor in an anchor hole subjected to a predetermined ground improvement, and a ground improvement combined type drilling machine having a function as a ground improvement machine.
[0002]
[Prior art]
As an anchor method for constructing anchor bodies on so-called soft ground such as sand layers and clay soil layers, for example, a predetermined ground improvement is applied to the anchor hole, and a predetermined range including at least this ground improvement zone is set as the anchor length A so-called ground improvement type anchor method for constructing an anchor body is known.
[0003]
In such an improved ground anchor method, a predetermined length anchor hole is preliminarily drilled in the target ground using the casing pipe of the hole drilling machine as in the normal anchor method. And in the known ground improvement type anchor construction method, after preliminary drilling, under high pressure injection such as ground improvement material by injection rod inserted into the casing pipe, the ground improvement is applied to a specific range of the anchor hole bottom, The anchor body is constructed by reshaping the anchor hole in this ground improvement area.
[0004]
An example of this type of ground improved anchor method is, for example, Japanese Patent No. 2807869 (Japanese Patent Laid-Open No. 09-184137).
[0005]
[Problems to be solved by the invention]
The work process in the known ground improvement type anchor method generally includes a preliminary drilling process for drilling an anchor hole, a ground improvement process for improving the ground with a ground improvement material, and an anchor body creation process for creating an anchor body. Can be divided roughly. Usually, the preliminary drilling of the anchor hole and the anchor body are each performed by the drilling machine, and the rotating means for rotating the injection rod and the pressure feeding means for pumping the ground improvement material etc. into the injection rod are provided. The ground improvement is performed by the ground improvement machine provided.
[0006]
As described above, in the known ground improvement type anchor method, different machines, that is, respective dedicated machines are used in the preliminary drilling process, the anchor body creation process, and the ground improvement process. And since these machines are usually installed in the same place on the ground surface, in the known ground improvement type anchor construction method, it is necessary to replace the machine for each work process.
[0007]
In other words, in the known ground improvement type anchor method, it is necessary to replace the machine at each work process, and this machine replacement requires a considerable amount of time, which increases the work time and thus the construction efficiency. Inevitable decrease in
[0008]
Further, in the known ground improvement type anchor method, the anchor hole is merely preliminarily drilled using the casing pipe.
[0009]
In the case of drilling in the casing pipe, drilling water is generally used, and mud water, slime and the like generated thereby are usually discharged outside through the outer peripheral surface of the casing pipe. However, if the muddy water is discharged from the outer peripheral surface of the casing pipe to the outside, the muddy water may be absorbed and permeated into the peripheral surface ground of the casing pipe. Occurrence of turbulence of the ground due to comminution and partial collapse is likely to accompany conventional preliminary drilling on soft ground.
[0010]
And in the conventional preliminary drilling of an anchor hole, since muddy water tends to accumulate in the bottom part of an anchor hole, it is easy to accompany the generation | occurrence | production of the ground disturbance etc. also from this point.
[0011]
Here, in the known ground improvement type anchor method, the drilling length of the anchor hole is recognized based on the number of casing pipes added and the remaining scale, etc., and the ground improvement status is determined by measuring the flow rate and pressure of the ground improvement material. I know. And, in the work with the known drilling machine and ground improvement machine, since these construction conditions were measured artificially, the number of personnel required for the work inevitably increased, and this artificial measurement There is a risk that workability may be reduced due to a human error caused by this.
[0012]
Furthermore, in order to leave a work record, these measurement results must be copied and recorded on a dedicated recording sheet, memo sheet, etc., so that the complexity of data management is also difficult with known drilling machines or ground improvement machines It is inevitable.
[0013]
An object of the present invention is to provide a ground improvement type anchor construction method that enables preliminary drilling of an anchor hole, ground improvement, and construction of an anchor body without replacement of a machine.
[0014]
In addition, this ground improvement type anchor construction method can be appropriately performed, and the structure can be simplified, the machine itself can be reduced in size, and the ground improvement combined drilling machine that enables easy data management. Providing is another object of this invention.
[0015]
[Means for Solving the Problems]
In order to achieve this object, according to the ground improved anchor method of the present invention, the protruding form of the inner rod with respect to the casing pipe in which the nozzle provided on the peripheral surface of the leading end protrudes from the drilling tool at the leading end of the casing pipe. As a drilling form with a double drilling tube, it is fixedly maintained in the advancing and retracting direction. Then, the drilling water is injected from the nozzle of the inner rod at a predetermined pressure, and the rotation of the double drilling tube in the form of the drilling and the integrated advance is accompanied by the predetermined injection of the drilling water. Then, the anchor hole is once drilled to the expected depth, and a predetermined ground improvement material is sprayed from the nozzle of the inner rod under a high-pressure spray higher than the spray pressure of the drilling water instead of the drilling water. The ground improvement is performed in this retreat range by the integral rotation of the drilling tube in the form of a drilling hole with high-pressure injection of the ground improvement material and the integral retraction from the anchor hole bottom to a predetermined position.
[0016]
Next, after holding the casing pipe at the rear end position of the ground improvement zone and collecting only the inner rod under its retreat, before hardening the ground improvement material, the casing pipe is moved to the inside of the grout material. It is advanced again to the anchor hole bottom with pumping. Then, after further pressure injection of the grout material by the grout hose inserted up to the tip of the casing pipe, an uncurtain dong is inserted and arranged in the casing pipe, and the casing pipe is recovered under its retraction, then the anchor Tendon is tense and settled.
[0017]
Moreover, in the ground improvement combined type drilling machine of this invention, the single slide body is arrange | positioned along the slide guide extended linearly under the predetermined | prescribed moving means so that a slide is possible. And, as a substantially pipe-shaped body that allows the rear end of the casing pipe to be connected and held by a connecting tool at the front end, a body pipe assembled with a water swivel as a part thereof, and an inner rod are inserted and penetrated Each slide body is provided with a body rod that is assembled and formed with a water swivel at its rear end as a hollow, substantially rod-shaped body that can be gripped by a gripping tool at the tip.
[0018]
The main body pipe is disposed on the slide body so as to be rotatable under the corresponding rotation driving means. On the other hand, the main body rod that rotates integrally with the main body pipe by the corresponding rotation driving means is supported by the slide body via the predetermined advancing / retreating driving means so as to be able to move forward and backward with respect to the penetrating main body pipe. In addition to being able to support the casing pipe so that it can rotate and move forward and backward, a casing pipe support means formed so as to be able to hold the casing pipe forward and backward is also arranged at the front end of the slide guide. And installing a gripping means for the inner rod formed so as to be able to grip the inner rod so that the inner rod cannot be moved back and forth at the front end portion of the slide guide at the rear position of the support means, thereby providing a double drilled tube, The casing can be integrally moved forward and backward by a single slide body, and can be rotated integrally under the synchronous drive of the rotation driving means, and the casing can be moved only by the main body rod by the advance / retreat driving means. It is possible to ensure that only the inner rod is retracted from the pipe.
[0019]
Moreover, the ground improvement combined type drilling machine according to the present invention measures a predetermined item necessary at the time of drilling an anchor hole and at the time of ground improvement by a corresponding measuring device as needed, and appropriately measures the measurement result by an excavation recording device. Display and recording are possible.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0021]
As shown in FIG. 1 and FIG. 2 (B), the ground improvement combined type drilling machine 10 according to the present invention uses a double drilling pipe 16 comprising a combination of a casing pipe 12 and an inner rod 14. It is formed as a drilling machine capable of so-called double pipe drilling. In this hole drilling machine 10, a single slide body 18 is slidably disposed on a linear slide guide 20, and a main body pipe 22 capable of holding the casing pipe 12, and an inner rod Main body rods 24 that can hold 14 are respectively disposed on the slide bodies.
[0022]
As can be seen from FIG. 1, the slide guide 20 is formed as a rail-shaped guide body extending in a straight line, and is tilted with respect to the machine body 26 having the traveling means 25 and the like via, for example, the support arm 28 and the like. In general, it is connected and supported so as to be swingable between a horizontal position and an upright position. The slide body 18 is configured and arranged so that it can be slid in the front-rear direction (left-right direction in the figure) on the slide guide 20 by a moving means (not shown) having a combination of an oil motor and a chain. It is installed.
[0023]
The main body pipe 22 capable of holding the casing pipe 12 is, for example, an abbreviation having a pipe body as a base, a connector 30 capable of connecting the rear end of the casing pipe at the tip, and a water swivel 32 at a part thereof. It is assembled and formed as a pipe-shaped body. The main body pipe 22 is disposed on the slide body 18 so as to be rotatable by the corresponding rotation driving means 34.
[0024]
Here, in the present invention, the main body rod 24 capable of holding the inner rod 14 is based on a hollow rod body that allows the inner rod to be inserted and penetrated, and the gripping tool 36 that grips the inner rod is the tip thereof. The part is assembled and formed as a substantially rod-shaped body having a water swivel 38 at its rear end.
[0025]
The main body rod 24 is slidably penetrated in the axial direction with respect to the main body pipe 22, and the main body pipe is driven by the corresponding rotation driving means 40 capable of synchronously rotating with the rotation driving means 34 of the main body pipe. And a predetermined advancing / retreating drive means 42 is arranged and connected to the slide body 18 so as to be capable of advancing / retreating in the axial direction with respect to the main body pipe.
[0026]
As the rotation drive means 34, 40, for example, a combination of a drive mechanism such as a motor and a rotation mechanism can be used in the same manner as in the prior art, and as the advance / retreat drive means 42, for example, an oil motor or a hydraulic cylinder, etc. Is available.
[0027]
In this configuration, since both the main body pipe 22 and the main body rod 24 are disposed with respect to the single slide body 18, the main body pipe, and the slide of the slide body on the slide guide 20 The main body rod is moved forward and backward integrally. Further, since the rotation driving means 34 of the main body pipe and the rotation driving means 40 of the main body rod can be synchronously driven, the integral rotation operation of the main body pipe 22 and the main body rod 24 is based on this synchronous rotation driving. Can be secured easily.
[0028]
Furthermore, since the main body rod 24 is connected to the slide body 18, and eventually the main body pipe 22 via the advance / retreat driving means 42, the main body rod is independently attached to the main body pipe while being disposed on the single slide body 18. Can be secured.
[0029]
Further, as shown in FIG. 1, the hole drilling machine 10 of the present invention includes a support means 43 for a casing pipe and a grip means 44 for an inner rod at the front end portion of the slide guide 20.
[0030]
The support means 43 is configured to be capable of holding the casing pipe 12 so as to be rotatable and advanceable / retractable, and to be capable of holding the advancement / retraction movement disabled by a predetermined switching operation, for example. By providing the support means 43, stable forward and backward movement of the casing pipe 12 held by the main body pipe 22 can be easily secured, and the casing pipe can be fixed in a state in which the holding by the main body pipe is released. It is possible to ensure proper gripping by this support means.
[0031]
The gripping means 44 is formed so as to be capable of gripping the inner rod 14 so as not to move forward and backward, and is disposed at a rear position of the support means 43. The gripping means 44 is configured as a movable body that can be retracted to a position that does not hinder the arrangement of the casing pipe 12, such as a lower position (see FIG. 2B).
[0032]
The ground improved anchor method of the present invention using the ground improved combined drilling machine 10 will be described below together with the operation of the drilling machine.
[0033]
First, preliminary drilling of the anchor hole is performed on the target ground (soft ground) 45 (see FIG. 2A).
[0034]
In the preliminary drilling process of the anchor hole, as shown in FIG. 2 (B), a double drilled pipe 16 comprising a casing pipe 12 and an inner rod 14 is used, and the casing to the connector 30 of the main pipe is used. The double drilled tube is attached to the slide body 18 under the connection of the rear end of the pipe and the grip of the inner rod rear end by the gripper 36 of the main body rod.
[0035]
The single unit of the double drilling pipe 16, that is, the casing pipe 12 and the inner rod 14, is usually about 1.5 m in length, and is used by sequentially adding according to the drilling depth. The casing pipe 12 arranged at the top has a drill bit 46 such as a ring bit at the tip, and the leading inner rod 14 has a nozzle 48 at a part of the peripheral surface of the tip. , Each used.
[0036]
Here, as can be seen from FIGS. 2 (A) and 2 (B), in the present invention, the nozzle 48 at the tip is forward (to the left in the figure) from the ring bit (excavator) 46 at the tip of the casing pipe. The protruding form of the inner rod 14 with respect to the casing pipe 12 is defined as a drilling form in the double drilling pipe 16, and is fixedly maintained in the forward / backward direction on the slide body 18.
[0037]
In the drilling machine 10 of the present invention, the front limit position of the main body rod 24 with respect to the main body pipe 22 is defined and set in advance as a drilling position for maintaining the double drilling pipe 16 in its drilling configuration. .
[0038]
As shown in FIGS. 2 (A) and 2 (B), in the preliminary drilling step of the anchor hole, the drilling water is supplied from the inlet 38a of the water swivel 38 through the main body rod 24 by a pump means or the like. The inner rod 26 is pressure-fed and supplied, and is injected at a predetermined pressure in a radial direction centered on the inner rod from the nozzle 48 at the tip of the inner rod. Then, the casing pipe 12 and the inner rod 14 are integrally rotated in the same direction by the synchronous rotation driving of the rotation driving means 34 and 40 while the predetermined pressure injection of the drilling water 50 from the nozzle 48 is performed, and FIG. As shown in (A) and (B), the casing pipe and the inner rod are integrally moved forward with respect to the ground 45 under the slide of the slide body 18 with respect to the slide guide 20, so that the drilling water and the outer casing are obtained. Under the combination with the ring bit 46 at the tip, the anchor hole 52 is once drilled to a predetermined depth L as shown in FIG.
[0039]
Here, as described above, the drilling of the anchor hole is performed with the addition of the casing pipe 12 and the inner rod 14.
[0040]
For example, as shown in FIG. 3B, the casing pipe 12 and the inner rod 14 are removed from the main body pipe 22 and the main body rod 24 at the position before the slide body 18 slides with respect to the slide guide 20, respectively. ), The slide body is once moved rearward after the preceding casing pipe and inner rod are gripped by the support means 43 and the gripping means 44, respectively. As can be seen from FIG. 4B in addition to FIG. 4A, at the rear position of the slide body 18, the next-stage casing pipe 12 and the inner rod 14 are respectively connected to the preceding-stage casing pipe and inner casing. Connection of the front end to the rod, and connection of the rear end to the main body pipe 22 and the main body rod 24, and mounting under gripping, as in the above-described work process, integral rotation by the rotation drive means 34, 40, The drilling of the anchor hole 52 is sequentially advanced under the advance by the slide body 18.
[0041]
Further, in such a drilling hole by the casing pipe 12 and the inner rod 14, that is, a double pipe drilling hole, for example, as shown by an arrow in FIG. , And slime and the like are returned toward the rear end of the double holed tube 16 through a gap 53 formed between the casing pipe and the inner rod, that is, through a discharge passage defined in the casing pipe. Then, the muddy water and the like returned through the discharge path (gap) 53 in the casing pipe passes through the discharge port 32a of the water swivel 32 of the main body pipe to the outside of the casing pipe, that is, the double bored pipe 16. It is discharged (see FIG. 2 (A)).
[0042]
That is, according to the double pipe drilling using such a double drilled pipe 16, mud water, slime, etc. generated by using the drilled water are discharged without passing through the outer peripheral surface of the casing pipe 12. Therefore, further softening around the casing pipe due to muddy water or the like can be prevented, and ground disturbance such as ground subsidence and ground collapse due to this softening can be reliably suppressed. And, since muddy water and the like (mud) returned through the discharge channel 53 in the casing pipe is discharged to the outside of the double bored tube 16 through the water swivel discharge port 32a, By connecting a hose, etc., the mud can be easily treated, and the mud does not run down to the work ground, etc., and the mud of the scaffold is reliably prevented, so the workability is improved. The
[0043]
Further, in the present invention, since the protruding form of the inner rod 14 with respect to the casing pipe 12 is defined as the drilling form in the double drilling pipe 16, muddy water generated by the injection of the drilling water 50 is anchored. Since it is immediately discharged from the discharge path 53 in the casing pipe without staying in the hole 52, the ground disturbance due to the use of the drilled water is reliably suppressed.
[0044]
The step of drilling the anchor hole 52 up to the planned depth L shown in FIG. 3A as described above is the preliminary drilling step of the anchor hole in the ground improved anchor method of the present invention. And in this invention, a ground improvement process is performed continuously to this preliminary drilling process.
[0045]
As shown in FIG. 3 (A), also in this ground improvement process, the double drilled pipe 16 is maintained in the same drilling form as the preliminary drilling. Then, instead of the drilling water 50 used for the preliminary drilling, a predetermined ground improvement material, for example, cement milk is pumped and supplied into the inner rod 14, and a high-pressure injection higher than the injection pressure of the drilling water is supplied. Then, the ground improvement material 54 is sprayed in the radial direction from the nozzle 48 of the inner rod, as shown by a one-dot chain line in FIG. 3 (A) and 3 (B), the casing pipe 12 in the form of drilling, the inner rod 14, that is, the double drilling pipe 16, is integrated by moving the slide body 18 backward. It is retracted to a predetermined position with general rotation (see FIG. 5A).
[0046]
In other words, as shown in FIG. 5 (A), in this ground improvement process, a range L1 in which the double drilled pipe 16 is retreated from the bottom of the anchor hole in its drilling form is the ground improvement area in the ground 45. Created.
[0047]
Each time the double-drilled pipe 16 is retracted, the number of double-drilled pipes corresponding to the retracted length, i.e., the casing pipe 12 and the inner rod 14, is changed each time in the reverse procedure. It is removed (see the dashed line arrow in FIG. 4A).
[0048]
After the ground improvement by the ground improvement material 54, for example, with the slide body 18 stopped, the casing pipe 12 is held at the ground improvement end position as shown in FIG. Recover under a setback.
[0049]
Retraction and recovery of only the inner rod 14 from the inside of the casing pipe 12 is performed under the movement of the main body rod 24 by the advance / retreat driving means 42. For example, it is assumed that the positions of the slide body 18 and the main body rod 24 shown in FIG. 4B are the initial positions in a state where the casing pipe 12 is held at the ground improvement end position. Then, from such a state, the advancing / retreating drive means 42 is operated, and the main body rod 24 is once retracted together with the inner rod 14 as shown in FIG. 6 (A), and the gripping of the inner rod 14 by the gripping tool 36 is released. Later, as shown in FIG. 6 (B), the main body rod is moved forward relative to the inner rod, and the inner rod is moved back and forth repeatedly by holding the inner rod again at the forward position of the main body rod and moving backward. By sequentially pulling the rod backward, the inner rod can be extracted from the casing pipe 12, that is, recovered.
[0050]
After the inner rod 14 is pulled out and recovered from the casing pipe 12 and before the ground improvement material 54 is hardened, the casing pipe is pumped with the grout material 56 to the inside thereof as shown in FIG. 7 (A). Then, it is advanced again to the bottom of the anchor hole 52.
[0051]
Needless to say, the advancement of the casing pipe 12 is performed under the slide (advance) of the slide body 18 with respect to the slide guide 20, and the casing pipes may be sequentially added according to the depth. This is the same as the preliminary drilling step.
[0052]
Here, although the ground improvement within a predetermined range was performed by the ground improvement material 54, the ground improvement area L1 is composed of a mixture of the ground improvement material and mud, etc., so the purity of the ground improvement material is high. However, it may be accompanied by a decrease in the curing strength. Therefore, when the casing pipe 12 is re-advanced, if the grout material 56 is pumped and injected into the ground improvement area L1 through the casing pipe 12, the hardening material in the ground improvement area is added by adding the grout material to the ground improvement material. Therefore, the hardening strength in the ground improvement area, that is, the certainty of the ground improvement is improved.
[0053]
Next, an anchor body creation process is performed. First, as shown in FIG. 7 (B), a predetermined grout hose 58 is inserted up to the tip of the casing pipe 12, and the grout for increasing the purity of the grout material in the casing pipe through the grout hose. The material 56 is further pressure injected into the casing pipe. Then, before the grout material 56 is cured, as shown in FIG. 8 (A), a predetermined uncurtain dong 60 is inserted and arranged in the casing pipe 12, and the casing pipe is repetitively moved forward and backward. Under this condition, the pipe is removed and recovered, and as shown in FIG. 8B, after the casing pipe is recovered, the uncurtain dong 60 is tensioned and fixed by a predetermined fixing device 62, thereby improving the ground improvement area. An anchor body 64 with a fixing length L1 is constructed and constructed.
[0054]
The uncurtain dong 60 used in such an improved ground anchoring method preferably has a structure having a center riser 66 capable of opening and closing as shown in FIGS. 8 (A) and 8 (B). Since this type of center riser 66 can be expanded from the closed position under a predetermined biasing force, the diameter of the anchor hole 52 changes, that is, the ground improvement type anchor method that is expanded in the ground improvement region L1. Even so, the centerer functions effectively. Since the uncurtain dong 60 is securely held substantially at the center position of the anchor hole 52 due to the diameter increase of the center riser 66, high reinforcement strength for the ground can be easily secured.
[0055]
As described above, in the ground improved anchor method of the present invention, the double drilling pipe 16 comprising the casing pipe 12 and the inner rod 14 is used, and the drilling water 50 is sprayed from the nozzle 48 of the inner rod. Thus, the preliminary drilling of the anchor hole 52 is performed, and the ground improvement is performed by spraying a ground improvement material 54 from the nozzle of the inner rod in place of the drilling water. In other words, without changing the inner rod 14, it is only necessary to appropriately switch the spray material injected from the nozzle 48, so the transition from the preliminary drilling process of the anchor hole to the ground improvement process does not involve replacement of the machine itself. Yes.
[0056]
As described above, according to the ground improved type anchor method of the present invention, it is not necessary to replace the machine at each work process, and therefore, by omitting the time for replacing the machine, the work time can be shortened and the work efficiency can be improved. I can be sure.
[0057]
Further, in the ground improved anchor method of the present invention, the preliminary drilling of the anchor hole 52 is performed by the double pipe drilling, and the drilling form of the double drilled pipe 16 at that time is changed to the inner for the casing pipe 12. The protruding form of the rod 14 is defined. According to this, in addition to the effect of the double pipe drilling that can suppress the disturbance of the ground due to the generation of muddy water and the like and the workability is improved by facilitating the muddy water treatment, It is possible to reliably and easily further prevent ground disturbance due to the use of drilling water by draining muddy water generated by injection of 50 immediately without staying in the anchor hole 52. Become.
[0058]
And, according to the ground improvement combined type drilling machine 10 of the present invention, there is a configuration capable of appropriately performing the above ground improvement type anchor method without causing unnecessary movement of the machine and without causing an increase in size or the like. It can be easily secured.
[0059]
For example, as a drilling machine capable of double pipe drilling, for example, a boring machine using a double header drill disclosed in Japanese Patent Laid-Open No. 06-221075 can be used. However, this known drilling machine (boring machine) has a structure in which individual moving means having a certain size or more move straight on the same base, so that the moving range of the moving means is sufficient. Therefore, it is inevitable to increase the length of the base and thus the size of the machine itself.
[0060]
On the other hand, since the ground improvement combined type drilling machine 10 of the present invention has a configuration in which both the main body pipe 22 and the main body rod 24 are disposed on a single slide body 18, the entire range of the slide guide 20 is wide. , The moving range of the main body pipe and the main body rod. That is, according to the present invention, the movement range of both the main body pipe 22 and the main body rod 24 can be secured sufficiently long without causing the slide guide 20 to be long.
[0061]
Therefore, the size of the machine itself can be easily reduced without reducing the range of the main pipe 22 and the main body rod 24.
[0062]
Since the slide body 18 is single and the configuration of the moving means for that is simplified, the overall configuration can be simplified sufficiently by reducing the number of parts.
[0063]
Furthermore, since the main body pipe 22 and the main body rod 24 are integrally moved forward and backward by the slide of the single slide body 18, the integral movement of the casing pipe 12 and the inner rod 14 is ensured appropriately and easily. It becomes possible.
[0064]
Further, in the hole drilling machine 10 of the present invention, the rotation driving means 34 of the main body pipe and the rotation driving means 40 of the main body rod can rotate synchronously, so that the casing pipe 12 and the inner rod 14 rotate integrally. Can be easily secured.
[0065]
And, in this drilling machine 10, because the front limit position of the main body rod 24 relative to the main body pipe 22 is defined and set in advance as a drilling position for maintaining the double drilling pipe 16 in its drilling configuration, This drilling configuration can be easily set without complicating operations, and deviations during drilling operations can be reliably prevented according to this configuration. Therefore, the anchor hole in the ground improvement anchor method is used. Therefore, preliminary drilling and ground improvement can be reliably and easily performed.
[0066]
That is, according to the hole drilling machine 10, although the ground improved anchor method of the present invention can be appropriately performed, the configuration can be simplified and the machine itself can be sufficiently downsized.
[0067]
By the way, in the preliminary drilling work of the anchor hole by a general drilling machine, the drilling length of the anchor hole is recognized by the number of connected casing pipes and the remaining scale, etc., and the ground improvement work by the ground improvement machine, etc. Has grasped the ground improvement situation by measuring the flow rate, pressure, etc. of the ground improvement material with a dedicated measuring instrument provided for each individual pump means. In other words, in the known drilling machine and ground improvement machine, these construction conditions were measured artificially, so not only the number of personnel required for the work inevitably increased, but also workability due to human error. It also invites a decline.
[0068]
In addition, in order to leave a work record, these measurement results must be recorded with a memo or the like, so that complicated data management is also unavoidable with known drilling machines or ground improvement machines. Yes.
[0069]
Therefore, in the drilling machine 10 of the present invention, predetermined items necessary for drilling the anchor hole 52 and ground improvement are measured as needed by a corresponding measuring instrument (not shown), and the measurement results are shown in FIG. The excavation recording device 68 as shown in FIG.
[0070]
The excavation recording device 68 is formed, for example, as an assembly of various measuring instruments 70, and is configured to be able to output, display, and record the measurement results obtained by the measuring instruments on the display 72 and the printer 74.
[0071]
Items to be measured by the excavation recording device 68 include, for example, anchor hole depth, drilling speed, drilling water, ground improvement material, flow rate per minute, pressure, and total flow rate, as well as date and time. The construction number can be exemplified.
[0072]
Note that the depth of the anchor hole and the drilling speed are measured by measuring the number of rotations and the rotation speed of the oil motor provided in the moving means for the slide body 18 and per minute of drilling water and the like. The flow rate, pressure, and total flow rate are respectively determined by monitoring the detection means provided in each pump means.
[0073]
In addition, the excavation recording device 68 can be easily recognized in an integrated manner with an operation panel (not shown) provided with operation means for performing various operations of the drilling machine 10 or when the operation panel is operated. It is provided with respect to the machine main body 26 of the drilling machine in the position or the like (see FIG. 1).
[0074]
By providing such a drilling recording device 68 in the drilling machine 10, it is sufficient for the operator to perform work based on the recognition of the measurement values in this drilling recording device, so that human errors are reliably reduced. In addition, the number of workers can be surely reduced.
[0075]
The excavation recording device 68 keeps measurement records of various items, and can be recorded and output on a predetermined recording sheet 76 by the printer 74. Therefore, if this record is attached to a daily work report or the like, the work data can be transmitted. , Preservation is obtained accurately. In other words, the data management of the work data becomes easy, and the work data can be clarified reliably and easily according to the excavation recording device 68.
[0076]
The above-described embodiments are for explaining the present invention, and do not limit the present invention. All modifications, alterations, and the like within the technical scope of the present invention are included in the present invention. It goes without saying that it is done.
[0077]
【The invention's effect】
As described above, according to the ground improved anchor method according to the present invention, the double hole drilling pipe used for the preliminary drilling of the anchor hole is used in the form as it is for the ground improvement. The transition from the drilling process to the ground improvement process can be performed without replacement of the machine itself. And since the replacement of the machine for each work process is not required, the reduction of the work time and the improvement of the construction efficiency can be ensured by omitting the replacement time of the machine.
[0078]
In addition, the preliminary drilling of the anchor hole is performed by the double pipe drilling hole, and the drilling form of the double drilled pipe at that time is defined as the protruding form of the inner rod with respect to the casing pipe. It is possible to immediately discharge muddy water or the like generated by jetting without being retained in the anchor hole. Therefore, further prevention of ground disturbance due to the use of drilling water can be reliably and easily performed.
[0079]
And according to the ground improvement combined use type drilling machine of this invention, since it is the structure which has arrange | positioned both the main body pipe and the main body rod in the single slide body, without causing the slide guide to become long, the main body The movement range of both the pipe and the main body rod can be expanded sufficiently.
[0080]
Therefore, the size of the machine itself can be easily reduced without reducing the range of movement of the main body pipe and the main body rod.
[0081]
Since the slide body is single and the configuration of the moving means for that is simplified, the overall configuration can be simplified sufficiently by reducing the number of parts.
[0082]
Further, since the main body pipe and the main body rod are integrally moved forward and backward by the slide of the single slide body, the integral forward and backward movement of the casing pipe and the inner rod can be ensured appropriately and easily.
[0083]
In the present invention, since the rotation driving means of the main body pipe and the rotation driving means of the main body rod can rotate synchronously, the integral rotation of the casing pipe and the inner rod can be easily ensured.
[0084]
That is, according to the ground improvement combined type drilling machine of the present invention, although the ground improvement type anchor construction method of the present invention can be appropriately performed, the structure can be simplified and the machine itself can be downsized sufficiently. I can take off.
[0085]
If the foremost position of the main body rod with respect to the main body pipe is defined and set in advance as a drilling position for maintaining the double drilled pipe in its drilling configuration, this drilling can be performed without complicating operations. Since the configuration can be easily set, and deviation during drilling work can be reliably prevented according to this configuration, the preliminary drilling of the anchor hole and the ground improvement in the ground improvement anchor method are more reliable, and Easy to do.
[0086]
The ground improvement type drilling machine according to the present invention measures the predetermined items necessary at the time of drilling anchor holes and at the time of ground improvement with a corresponding measuring device as needed, and displays the measurement results as appropriate by an excavation recording device. It is possible to record.
[0087]
According to this configuration, since it is sufficient for the operator to perform work based on the recognition of the measurement value by the excavation recording apparatus, human error is surely reduced, and the reduction of work personnel is ensured. I can be taken.
[0088]
And since this excavation recording device keeps measurement records of various items, it can be recorded and output on a predetermined recording sheet by a printer, so if this record is attached to the daily work report etc., the work data can be transmitted and stored Accurately obtained. That is, the data management of the work data becomes easy, and the work data can be clarified reliably and easily according to the excavation recording apparatus.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a ground improvement combined type drilling machine according to the present invention.
FIG. 2 is a schematic process diagram in a preliminary drilling process in the ground improvement type anchor method according to the present invention, and a schematic operation diagram of a corresponding ground improvement type drilling machine corresponding thereto;
FIG. 3 is a schematic process diagram in a preliminary drilling process in a ground improvement type anchor construction method, and a schematic operation diagram of a ground improvement combined type drilling machine corresponding thereto;
FIG. 4 is a schematic operation diagram of the ground improvement and type drilling machine before the double-drilled pipe is added (after removal) and in the added state of the double-drilled pipe.
FIG. 5 is a schematic process diagram in the ground improvement process in the ground improvement type anchor method.
[Fig. 6] Fig. 6 is a schematic operation view of the ground improvement and combination type drilling machine, showing when the inner rod is pulled out.
FIG. 7 is a schematic process diagram in the ground improvement process in the ground improvement type anchor method, and a schematic process diagram in the anchor body creation process.
FIG. 8 is a schematic process diagram in an anchor body building process in the ground improvement type anchor method.
FIG. 9 is a schematic perspective view of the excavation recording apparatus.
[Explanation of symbols]
10 Ground improvement combined use excavator
12 Casing pipe
14 Inner rod
16 Double drilled pipe
18 Slide body
20 Slide guide
22 Body pipe
25 Body rod
32,38 Water swivel
34,40 Rotation drive mechanism
42 Advance and retreat drive
43 Support means
44 Gripping means
68 Drilling recorder

Claims (3)

The protruding form of the inner rod relative to the casing pipe with the nozzle provided on the peripheral surface of the tip protruding from the drilling tool at the tip of the casing pipe is fixedly maintained in the advancing and retracting direction as a drilling form in the double drilling pipe. ,
Drilling water at a predetermined pressure from the nozzle of the inner rod, and with the predetermined pressure injection of this drilling water, the integral rotation of the double drilling tube in the form of drilling, and the integral advancement Then, the anchor hole is once drilled to the expected depth, and a predetermined ground improvement material is sprayed from the nozzle of the inner rod under a high-pressure spray higher than the spray pressure of the drilling water instead of the drilling water. The ground improvement is given to this retreat range by the integral rotation of the drilling tube in the form of drilling with high-pressure injection of this ground improvement material, and the integral retraction from the anchor hole bottom to a predetermined position,
After holding the casing pipe at the rear end position of the ground improvement zone and collecting only the inner rod under its retreat, before hardening the ground improvement material, the casing pipe is pumped with grout material inside. At the same time, it is advanced again to the bottom of the anchor hole, and after further pressure injection of the grout material by the grout hose inserted to the tip of the casing pipe, an uncurtain dong is inserted and arranged in this casing pipe, and the casing pipe is moved backward. An improved anchor construction method in which the uncurtain dong is tensioned and settled after being collected under the ground. It is a ground improvement and combined type drilling machine capable of double pipe drilling using a double drilling pipe consisting of a combination of a casing pipe and an inner rod,
A linearly extending slide guide;
A single slide body slid along the slide guide by a predetermined moving means;
As a substantially pipe-shaped body that allows the rear end of the casing pipe to be connected and held by a connecting tool at its front end, it is assembled and formed with a water swivel in a part thereof, and can be rotated under the corresponding rotational drive means. A main body pipe disposed on the slide body;
A hollow substantially rod-shaped body that can be inserted and penetrated through the inner rod and can be gripped by a gripping tool at the tip is assembled with a water swivel at the rear end thereof, and the main body pipe is formed by a corresponding rotational drive means. A body rod supported by the slide body via a predetermined advancing / retreating drive means so as to be rotated integrally with the body pipe and capable of advancing / retreating with respect to the penetrating body pipe;
In addition to being able to support the casing pipe so that it can rotate and move forward and backward, it is also possible to hold the casing pipe so that it cannot move forward and backward, and the casing pipe support means disposed at the front end of the slide guide. When;
Gripping means for the inner rod formed so as to be able to grip the inner rod so as not to move forward and backward, and disposed at the rear end of the support means at the front end of the slide guide;
The double-drilled tube can be moved forward and backward integrally by a single slide body, and can be rotated integrally under the synchronized driving of the rotary drive means, and the main body by the forward / backward drive means Under the forward and backward movement of only the rod, it is possible to ensure the backward movement of only the inner rod with respect to the casing pipe,
A ground improvement and combination type drilling machine capable of measuring predetermined items necessary for drilling an anchor hole and ground improvement with a corresponding measuring device as needed, and displaying and recording the measurement results as appropriate by an excavation recording device. The ground improvement and combined drilling machine according to claim 2, wherein the double drilling pipe can be set and held in its drilling configuration at a position before and after the main body rod advances and retreats with respect to the main pipe.

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