JP5649164B2 - Tubular retaining device and method - Google Patents

Description

  The present invention relates to a tubular body retaining device and method, and more particularly, to a tubular body that can reliably prevent a tubular body inserted into a casing rod from being pulled out together with the casing rod when the casing rod is pulled out from the ground. The present invention relates to a retaining device and method.

  In order to strengthen the soft ground, a construction method is known in which a ground improvement chemical is injected into the ground using a double pipe composed of an outer pipe and an inner pipe. In this ground improvement method, after drilling the ground with a casing rod, the outer tube is inserted into the casing rod installed in the drilling hole, and then the casing rod is pulled out on the ground, leaving the outer tube in the ground. Set to a fixed state. Next, the inner pipe is inserted into the outer pipe, the ground improving chemical solution is supplied through the inner pipe, and the ground improving chemical liquid is infiltrated and injected into the ground from the discharge port provided in the outer pipe. An anchor is provided at the tip of the outer tube so that the outer tube is not pulled out together with the casing rod when the casing rod is pulled out.

  Various types of this anchor have been proposed (see, for example, Patent Documents 1 and 2). Patent Document 1 discloses an anchor formed by spring blades (blade members) spreading on the outer peripheral side of the outer tube. In Patent Document 2, an anchor having a wing member that can be folded (see FIG. 1A), an anchor using a weight (see FIG. 1B), and an anchor using a bag body that inflates by injecting fluid (FIG. 1). -C) is illustrated. In order to increase the pulling resistance, an anchor having a blade member spreading on the outer peripheral side of the outer tube and an anchor using an expanding bag body are excellent.

  In order to make these anchors function, first, the anchors need to protrude from the tip of the casing rod to be exposed in the ground. Therefore, after the outer tube is inserted into the casing rod, the anchor attached to the distal end portion of the outer tube is protruded from the distal end of the casing rod by pulling the casing rod upward to some extent. However, since the anchor is not functioning when the casing rod is first lifted upward, the outer tube may be lifted together with the casing rod at this time.

  Further, an apparatus for preventing the drain material from rising together by using water pressure has been proposed (see Patent Document 3). In this apparatus, a cylindrical body filled with water is installed on a casing pipe placed on the ground. In order to pressurize the drain material downward, the water pressure of the water filled in the cylinder is used. Therefore, in order to obtain a sufficient applied pressure, the cylinder needs to have an appropriate capacity. Therefore, it is disadvantageous to make the device compact, and if it is made compact, it becomes a complicated structure. Furthermore, if the filling amount of water is not sufficient, it is impossible to prevent the drain material from rising together, resulting in a problem of lack of stability.

JP-A-1-131715 JP-A-2005-42426 Japanese Patent Laid-Open No. 10-112456

  An object of the present invention is to provide a tubular body retaining device and method that can reliably prevent a tubular body inserted into a casing rod from being pulled out together with the casing rod when the casing rod is pulled out from the ground.

In order to achieve the above object, the tubular body retaining device of the present invention includes a drilling machine for press-fitting a casing rod into the ground, and then pulling out the casing rod press-fitted into the ground onto the ground, and a casing press-fitted into the ground. A retaining device for a tubular body comprising a presser rod that abuts against a rear end portion of the tubular body inserted into the rod, wherein the drilling machine has a rail portion and a carriage that moves along the rail portion, A water supply pipe having one end attached to the carriage, and a joint provided on the carriage so as to communicate with the water supply pipe and to which the casing rod is detachably attached, and the water supply pipe having a water stop cap the tube is provided, the pressing rod through the insertion hole of the opened branch pipe remove this water stopping cap by inserting the joint, the presser rod tip Together abuts the rear end portion of the tubular body, the rear end portion of the presser rod is characterized by being configured to be fixed to the drilling machine.

Here, it provided a stopper which is fixed in place fitted to the rail section, it is also possible to adopt a configuration to abut the rear end portion of the pressing rod to the stopper. It can also be set as the structure provided with the anchor fixed to the front-end | tip part of the said tubular body.

In the tubular body retaining method according to the present invention, after a casing rod is press-fitted into the ground by a drilling machine, the tubular body is inserted into the casing rod, and a presser rod is brought into contact with the rear end portion of the tubular body. A method of preventing the tubular body from being pulled out by pulling a casing rod onto the ground with a hole drilling machine in a state in which the movement of the body to the upper side of the ground is regulated. It has a moving carriage, a water supply pipe having one end attached to the carriage, and a joint said casing rod is removably attached together are provided on the carriage so as to communicate with the water supply pipe, the water shut-off in the water supply pipe It may be provided a branch pipe provided with a cap, after inserting the tube into the casing rods pressed into the ground, opening the insertion hole of the branch pipe by removing the water stopping cap, this Said presser rod is inserted into the joint through the insertion hole, is brought into contact with the tip portion of the presser rods to the rear end portion of the tube body, by fixing the rear end of the presser rod drilling machines, the tube The casing rod is attached to the joint in a state where movement of the body to the upper side of the ground is restricted, and then the carriage is moved backward to pull out the casing rod onto the ground.

Here, a stopper is fitted and fixed at a predetermined position of the rail portion, and the rear end portion of the presser rod is brought into contact with the stopper to fix the rear end portion of the presser rod to the hole drilling machine. You can also.

  According to the retaining device of the present invention, the drilling machine has a rail portion, a carriage that moves along the rail portion, a water supply pipe that has one end attached to the carriage, and a carriage that communicates with the water supply pipe. And a joint to which the casing rod is detachably attached, so if the presser rod is inserted into the joint, the tip of the presser rod is connected to the rear end of the tubular body inserted into the casing rod. It can be made to contact. Since the rear end portion of the presser rod is fixed to the drilling machine, the movement of the tubular body to the upper side of the ground is restricted by the presser rod. Therefore, when the casing rod press-fitted into the ground is attached to the joint, and then the carriage is moved backward, the casing rod is pulled out on the ground. it can. In this way, it is possible to reliably prevent the tubular body inserted into the casing rod from being pulled out together with the casing rod. Since the presser rod does not interfere with the forward and backward movements of the carriage, the casing rod can be pulled out smoothly.

  By using the tubular body retaining device of the present invention described above, the tubular body retaining method of the present invention can be implemented. Therefore, when pulling out the casing rod from the ground, it is possible to more reliably prevent the tube inserted into the casing rod from being pulled out together with the casing rod.

It is explanatory drawing which illustrates the whole outline | summary of the retaining device of this invention. It is explanatory drawing which illustrates the internal structure of a carriage. It is explanatory drawing which illustrates the front-end part of a presser rod. It is explanatory drawing which illustrates a stopper and a rod guide. It is explanatory drawing which illustrates the process of press-fitting a casing rod in the ground. It is explanatory drawing which illustrates the process of inserting an outer tube | pipe into a casing rod. It is explanatory drawing which illustrates the process of making a presser rod contact | abut to an outer tube | pipe, and setting. It is explanatory drawing which illustrates the process of pulling out a casing rod. It is explanatory drawing which illustrates the state which act | operated the anchor fixed to the front-end | tip part of an outer tube | pipe.

  Hereinafter, a tubular body retaining device and method according to the present invention will be described based on an embodiment in which a ground improvement chemical solution is injected into the ground using a double tube including an outer tube and an inner tube. In this embodiment, the outer pipe is a tubular body that is prevented from coming off.

  As illustrated in FIGS. 1 and 2, the retaining device 1 of the present invention includes a drilling machine 2 and a presser rod 9. The hole drilling machine 2 functions to press-fit the casing rod 12 into the ground, and then pull the casing rod 12 press-fitted into the ground onto the ground. The presser rod 9 functions to restrict the movement of the outer tube 13 inserted into the casing rod 12 press-fitted into the ground to the upper side of the ground.

  The hole drilling machine 2 has a rail portion 8 extending in one direction on a body 3 provided on a crawler-driven chassis, and a carriage 4 that moves along the rail portion 8. The rail part 8 is attached to the body 3 so that the inclination angle can be changed. The hole drilling machine 2 further includes an insertion guide portion 3a for guiding the casing rod 12 when the casing rod 12 is press-fitted into the ground.

  One end of a water supply pipe 7 is attached to the carriage 4. The other end of the water supply pipe 7 is connected to a water supply source. The carriage 4 is provided with a moving motor 4a, and a gear (pinion) fixed to the driving shaft of the moving motor 4a is engaged with a rack formed on the rail portion 8.

  The carriage 4 is further provided with a cylindrical joint 5 so as to communicate with the water supply pipe 7. The front end portion of the joint 5 is a female screw, and the rear end portion of the casing rod 12 that is a male screw is detachably attached. The front end of the casing rod 12 is a female screw so that the casing rods 12 can be detachably connected. Therefore, the required number of casing rods 12 can be connected to have a desired length. In addition, the front-end | tip part of the joint 5 can be made into an external thread, the rear-end part of the casing rod 12 can also be made into an internal thread, and a front-end | tip part can also be made into an external thread.

  The joint 5 is driven to rotate about an axis extending in the cylindrical axial direction. A water swivel 6 is interposed between the joint 5 and the water supply pipe 7. Therefore, even if the joint 5 rotates, the water supply pipe 7 is not twisted.

  In this embodiment, the water supply pipe 7 is provided with a branch pipe 7a. The branch pipe 7 a is provided with three flow paths toward the water supply source side, the joint 5 side, and the side opposite to the joint 5. An insertion hole 7 b is formed in the flow path that faces away from the joint 5. That is, the insertion hole 7b is formed on the extension line of the joint 5, and the branch pipe 7a is provided with a water-stop cap 7c that closes the insertion hole 7b. The presser rod 9 is configured to pass through the joint 5 through the insertion hole 7b opened by removing the water stop cap 7c.

As a reference form, in order to insert the presser rod 9 into the joint 5, not only such a branch pipe 7a but also other structures can be adopted. For example, the water supply pipe 7 may be connected to the water swivel 6 through a general detachable joint. In the case of this structure, the water supply pipe 7 is separated from the water swivel 6 by the detachable joint, and the presser rod 9 is inserted from the water swivel 6 and inserted through the joint 5.

  The front end portion of the presser rod 9 comes into contact with the rear end portion of the outer tube 13 inserted into the casing rod 12 press-fitted into the ground. In this embodiment, as illustrated in FIG. 3, the front end of the presser rod 9 is a contact cap 9 a that is externally fitted so as to cover the rear end portion of the outer tube 13. The presser rod 9 and the contact cap 9a may be separated or integrated. Since the presser rod 9 has a structure in which the ends of the presser rods 9 can be connected to each other, the required number can be added to the required length.

  As a material of the presser rod 9, metals such as general carbon steel and high tension steel, hard resin, and the like can be used. The outer diameter of the presser rod 9 is a size through which the insertion hole 7b, the water swivel 6 and the joint 5 can be inserted, and is, for example, about 15 mm to 23 mm. The contact cap 9 a can be made of the same material as the presser rod 9. As the material of the outer tube 13, vinyl chloride or the like is used.

  The outer diameter of the contact cap 9 is set smaller than the inner diameter of the casing rod 12, and the contact cap 9 a can smoothly pass through the casing rod 12. In addition, the specifications of the contact cap 9a are determined so as not to hinder the attachment / detachment of the casing rod 12 and the joint 5.

  The rear end portion of the presser rod 9 is detachably fixed to the hole drilling machine 2. Specifically, as illustrated in FIG. 4, a block-like stopper 10 that is fitted to the rack of the rail portion 8 and fixed at a predetermined position is provided. The rear end portion of the presser rod 9 is fixed to the hole drilling machine 2 by contacting a stopper 10 fixed to the rail portion 8.

  Since the stopper 10 is structured to be fitted to the rack of the rail portion 8, it can be moved in units of the rack pitch, which is advantageous for fixing the stopper 10 at a required position. Further, the stopper 10 can be easily attached to and detached from the rail portion 8. Other structures may be adopted as long as the rear end portion of the presser rod 9 can be fixed to the drilling machine 2.

  In order to prevent displacement and deformation of the presser rod 9, a rod guide 11 illustrated in FIG. 4 may be provided. The rod guide 11 is detachable by being fitted to the rack of the rail portion 8 in the same manner as the stopper 10. The guide rod 11 is provided with a through hole 11c through which the presser rod 9 is inserted. The guide rod 11 has a vertically divided structure including a base portion 11a fitted to the rail portion 8 and a cap portion 11b attached to the base portion 11a. The through hole 11c is formed on the mating surface of the base portion 11a and the cap portion 11b.

  Further, a groove extending in the longitudinal direction may be formed on the upper surface of the rail portion 8, and the presser rod 9 may be fitted into the groove. That is, instead of the illustrated guide rod 11, a groove extending on the upper surface of the rail portion 8 can also function as a guide rod.

  The outer tube 13 is not pulled out together with the casing rod 12 to the upper side of the ground, and the method for preventing the tubular body from being fixed in the ground is as follows.

  First, as illustrated in FIG. 5, the carriage 4 is retracted along the rail portion 8 and arranged at the rear end portion of the rail portion 8, and then the front end portion of the casing rod 12 is inserted into the insertion guide portion 3 a. Attach the rear end to the joint 5. In this state, the moving motor 4a is operated to move the carriage 4 forward along the rail portion 8, thereby press-fitting the casing rod 12 into the ground.

  In this case, the joint 5 is rotationally driven to press-fit into the ground while rotating the casing rod 12. In addition, water is supplied from the water supply pipe 7, and water is infiltrated into the ground from the tip of the casing rod 12 through the hollow portion of the joint 5 and the casing rod 12. Therefore, the insertion hole 7b of the branch pipe 7a is closed by the water stop cap 7c. The ground is loosened by the supplied water, making it easy to drill holes.

  After the casing rod 12 having a required length is press-fitted into the ground, the moving motor 4 a is operated to move the carriage 4 backward along the rail portion 8 and arrange it at the rear end portion of the rail portion 8. Then, as illustrated in FIG. 6, the outer tube 13 is inserted into the casing rod 12 from between the rear end of the casing rod 12 and the front end of the carriage 4 (joint 5). Since the outer tube 13 is structured such that the end portions can be connected to each other, the outer tubes 13 are sequentially added so as to have a required length, and inserted until the tip of the outer tube 13 reaches the tip of the casing rod 12. .

  Next, the casing rod 12 is pulled out from the ground, and the outer tube 12 is fixed in the ground. At this time, the water stop cap 7c of the branch pipe 7a is removed to open the insertion hole 7b. The carriage 4 is moved forward along the rail portion 8 and disposed at the tip portion of the rail portion 8.

  Then, as illustrated in FIG. 7, the presser rod 9 is inserted into the joint 5 through the insertion hole 7 b, and the front end portion of the presser rod 9 is brought into contact with the rear end portion of the outer tube 13. In this embodiment, the abutment cap 9 a is used to stably abut the distal end portion of the presser rod 9 against the rear end portion of the outer tube 13.

  The rear end portion of the presser rod 9 is brought into contact with a stopper 10 fitted and fixed at a predetermined position of the rail portion 8. As a result, the rear end portion of the presser rod 9 is fixed to the hole drilling machine 2, so that the outer tube 13 is in a state in which the upward movement of the outer tube 13 is restricted by the presser rod 9. And the rear-end part of the casing rod 12 is screwed together and attached to the front-end | tip part of the joint 5. As shown in FIG.

  Next, as illustrated in FIG. 8, the carriage 4 is moved backward along the rail portion 8, and the casing rod 12 is pulled out on the ground. When the carriage 4 is moved backward, the rod guide 11 that becomes an obstacle is sequentially removed from the rail portion 8. When a plurality of casing rods 12 are connected, the connection is released and removed one by one each time the carriage 4 is moved once from the front end portion of the rail portion 8 to the rear end portion (one stroke). .

  Since the movement of the outer tube 13 to the upper side of the ground is restricted by the presser rod 9, it is not pulled out of the ground together with the casing rod 12. Moreover, in the outer tube 13 provided with an anchor at the tip as in the prior art, the anchor does not function, and the outer tube 13 moves toward the upper side of the ground even when the casing rod 12 is first pulled up to the upper side of the ground. It will never become settled in the ground. In this way, the present invention reliably prevents the outer tube 13 (tube body) inserted into the casing rod 12 from being pulled out together with the casing rod 12 without using a complicated mechanism by skillfully using the hole drilling machine 2. it can. The presser rod 9 and the contact cap 9a do not interfere with the forward and backward movement of the carriage 4. Therefore, it is very advantageous to smoothly pull out the casing rod 12.

  Thereafter, the inner tube is inserted into the outer tube 13 fixed on the ground. Next, the ground improvement chemical solution is supplied through the inner tube, and the ground improvement chemical solution is infiltrated and injected into the ground from the discharge port provided in the outer tube 13.

  The retainer rod 9 can prevent the outer tube 13 from being pulled out regardless of whether or not the distal end of the outer tube 13 is anchored. However, the retaining device 1 of the present invention has the distal end of the outer tube 13 as illustrated in FIG. It can also be made into the specification provided with the anchor 14 attached to a part. In addition, the anchor 14 provided in the front-end | tip part of the outer tube | pipe 13 is not limited to the structure illustrated below.

  The anchor 14 includes a cylinder 19 attached to the front end of the outer tube 13, a water injection pipe 23 that is detachably connected to the rear end of the cylinder 19 via a connecting portion 22, and water in the cylinder 19 through the water injection pipe 23. Water pressure applying means for supplying W, a piston 20 that moves in the cylinder 19 to the cylinder tip side by the water pressure of the supplied water W, a pressing member 16 that moves to the cylinder tip side together with the piston 20, and a pressing member 16 The opening / closing blade 15 that extends in the cylinder outer peripheral direction and the water pressure sensor that detects the water pressure in the cylinder 19 are provided. An enlarged outflow portion 19a for allowing the water W in the cylinder 19 to flow out of the cylinder is provided at a predetermined position of the cylinder 19, and the opening / closing blade 15 is moved by the cylinder 20 until the piston 20 moves to the position where the outflow portion 19a is provided. It is configured to spread at a predetermined opening angle in the outer circumferential direction. A pair of holding plates 17 sandwiching the pressing member 16 up and down are fixed to the tip of the cylinder 19, and two opening / closing blades 15 are pivotally supported on the holding plate 17 by a support shaft 18.

  In the case of this specification, after the outer tube 13 is inserted into the casing rod 12 press-fitted into the ground and the anchor 14 is disposed at the lower end of the hole H, the anchor 14 is caused to function. Therefore, water W is supplied into the cylinder 19 through the water injection pipe 23 from the water pressure applying means. The pressure member 16 moves together with the piston 20 to the tip side of the cylinder 19 by the water pressure of the supplied water W. When the pressing member 16 moves, the guide protrusion 16a moves along the guide hole 17a. The pressing member 16 that moves to the distal end side of the cylinder 19 advances so as to separate the pair of opening / closing blades 15. When the opening / closing blade 15 is pressed by the pressing member 16, it rotates about the respective support shafts 18 and spreads in the outer peripheral direction of the cylinder 19 to exert an anchor function.

  When the piston 20 moves to the outflow portion 19a, the water W in the cylinder 19 flows out of the cylinder 19 from the gap between the seal member 21 and the outflow portion 19a. The water pressure in the cylinder 19 decreases due to the outflow of the water W, and this decrease in water pressure is detected by a water pressure sensor. Therefore, it can be grasped by the water pressure sensor that the piston 20 has moved to the outflow portion 19a and the opening / closing blade 15 has spread at a predetermined opening angle in the ground.

  After the decrease in the water pressure in the cylinder 19 is detected by the water pressure sensor, the casing rod 12 is pulled out on the ground. At this time, since the outer tube 13 is firmly held in the ground by the opening / closing blades 15 spreading at a predetermined opening angle in the ground, the outer tube 13 is not pulled out together with the casing rod 12. Thus, in order to prevent the outer tube 13 from being pulled out to the upper side of the ground, the presser rod 9 and the anchor 14 can be used.

  The present invention is not limited to the case where the outer tube 13 is inserted into the casing rod 12 (hole H) that is inclined and press-fitted into the ground and is fixed in the ground, but the casing rod 12 that is press-fitted vertically into the ground (the hole H). This can also be applied to the case where the outer tube 13 is inserted into the ground and fixed in the ground. Further, the present invention can be applied not only to fix the outer pipe 13 for injecting the ground improvement chemical solution into the ground but also to fix the pipe used for other construction in the ground. For example, in a cylindrical drain construction method, it can be applied to fix a cylindrical drain pipe in the ground.

DESCRIPTION OF SYMBOLS 1 Stopper device 2 Drilling machine 3 Body 3a Insertion guide part 4 Carriage 4a Movement motor 5 Joint 6 Water swivel 7 Water supply pipe 7a Branch pipe 7b Insertion hole 7c Water stop cap 8 Rail part 9 Presser rod 9a Contact cap 10 Stopper 11 Rod guide 11a Base portion 11b Cap portion 11c Through hole 12 Casing rod 13 Outer tube 14 Anchor 15 Opening / closing blade 16 Pressing member 16a Guide projection 17 Holding plate 17a Guide hole 18 Support shaft 19 Cylinder 19a Outflow portion 20 Piston 20a Concave groove 21 Seal Member 22 Connecting part 23 Water injection pipe

Claims (5)

A drilling machine that presses the casing rod into the ground, and then pulls the casing rod that is press-fitted into the ground onto the ground, and a presser rod that comes into contact with the rear end of the tubular body inserted into the casing rod press-fitted into the ground. A tubular body retaining device comprising the drilling machine, wherein the drilling machine communicates with a rail portion, a carriage that moves along the rail portion, a water supply pipe having one end attached to the carriage, and the water supply pipe. A branch pipe provided with a water stop cap on the water supply pipe, and an insertion of the branch pipe opened by removing the water stop cap. the pressing rod is inserted through the joint through holes, the tip portion of the presser rod abuts the rear end portion of the tubular body, the rear end of the presser rod There tubular body retaining device being characterized in that the arrangement is fixed to the drilling machine. The tubular body retaining device according to claim 1 , wherein a stopper that is fitted to the rail portion and fixed at a predetermined position is provided, and a rear end portion of the presser rod is brought into contact with the stopper. The tubular body retaining device according to claim 1, further comprising an anchor fixed to a distal end portion of the tubular body. After the casing rod is press-fitted into the ground by a drilling machine, the tube is inserted into the casing rod, and the press rod is brought into contact with the rear end of the tube to restrict the upward movement of the tube A method of preventing the tubular body from being pulled out by pulling the casing rod onto the ground using a hole drilling machine, wherein the hole drilling machine has a rail portion, a carriage that moves along the rail portion, and one end portion attached to the carriage. A water supply pipe and a joint that is provided in the carriage so as to communicate with the water supply pipe and to which the casing rod is detachably attached, and a branch pipe provided with a water stop cap is provided in the water supply pipe, after inserting the pipe into the casing rods pressed into the ground, opening the insertion hole of the branch pipe by removing the water stopping cap, the presser rod through the insertion hole The tube body is moved upward to the ground by inserting the joint so that the tip of the presser rod abuts the rear end of the tube and fixing the back end of the presser rod to the drilling machine. The tube rod is attached to the joint in a restricted state, and then the carriage is moved backward to pull out the casing rod onto the ground. And fixed stopper fitted in a predetermined position of the rail portion, by abutting the rear end of the pressing rod to the stopper, in claim 4 for fixing the rear end of the presser rod drilling machine The tubular body retaining method according to the description.

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