JP6576230B2 - Rotating cap, ready-made pile burying device, pile foundation construction method - Google Patents

Description

  The present invention relates to a rotating cap used for constructing a pile foundation structure in which a pile with a hollow pile diameter is embedded in a pile hole filled with a mixture of a pile periphery fixing liquid and excavated earth and sand, and a ready made cap having the same. The present invention relates to a pile embedding device and a method for constructing the pile foundation structure using the ready-made pile embedding device.

  There is a pre-boring method as one of the construction methods for constructing a pile foundation structure with a pre-made pile with a hollow pile inside. This method involves excavating the ground with an earth auger or the like to provide a hole in the pile, and using this soil cement-like material obtained by stirring and mixing the root-solidifying solution or the pile circumference fixing liquid, or these and the excavated soil. The ready-made pile is buried in the pile hole filled with these fillers.

  The laying of the ready-made pile is connected to the pile head and the driving unit of the pile driving machine through a rotating cap, and the pre-made pile is inserted into the pile hole filled with the filling while rotating the ready-made pile. Done.

  The rotating cap is hollow and has a cylindrical shape with an open bottom, and a notch that can engage with a protrusion provided on the outer peripheral surface of the pile head to suspend and hold the pile on the outer peripheral side surface of the cylinder. One having a part is common.

  Some of them have various ingenuity depending on the purpose, such as those equipped with a pile head fixing jig so that ready-made piles can be buried accurately, and those that have a pile head processing function so that pile head processing can be performed reliably. There is also. There exists patent document 1 as an example of the former.

  The thing of patent document 1 is "in the internal diameter of the hollow part of the said foundation pile toward the lower end side of this foundation pile cap main body from the upper end obstruction | occlusion part of the cylindrical foundation pile cap main body fitted by the outer periphery of a pile head. A pile head fixing jig made of a rod-shaped elastic body having a corresponding outer diameter and shorter than the axial length of the cylindrical foundation pile cap body is suspended so as to be coaxial with the foundation pile cap body. The foundation pile cap.

  There exists patent document 2 as an example of the latter. The thing of patent document 2 has "a hollow shaft part for connecting with a pile driving machine in the upper part, a lower part of the said hollow shaft part which has a pile holding part which hold | pastes the pile head of a ready-made pile in a lower part. It is a “rotary cap with a pile head processing function” in which a nozzle capable of discharging the thinning liquid into the hollow portion of the ready-made pile is attached in the base of the rotary cap so as to communicate with the portion.

  On the other hand, when PHC piles are used as ready-made piles, in order to strengthen the connection with the pile head and footing in the upper pile, concrete may be placed inside the pile diameter of the pile head in the upper pile. Has been done.

  FIG. 9 shows this, and as shown in FIG. 9 (a), an existing pile is filled in the pile hole 3 filled with the filling 6 by the mixture of the pile circumference fixing liquid and the excavated earth and sand using the conventional rotating cap 41. After the filling 6 is hardened, the filling 6 filled in the pile diameter inside 29 of the pile head of the upper pile 4 is removed by the duplex scoop 43 or the like as shown in FIG. Thereafter, as shown in (c), concrete 44 is placed in the inside 29 of the pile diameter from which the filler 6 has been removed to reinforce the pile head. If necessary, before placing the concrete 44, a reinforcing bar having a reinforcing reinforcing bar and a connecting reinforcing bar with a footing is installed (not shown).

  Various measures have been taken to seismically strengthen the pile head of the upper pile. Patent Document 3 is an example of this, and in this example, an outer pipe (steel pipe) is arranged on the outer periphery of the pile head of a ready-made pile to reinforce the pile head with a double pipe structure.

JP 2009-238881 A JP 2001-336147 A JP 2001-107356 A

  When trying to perform seismic reinforcement of the upper pile with the ready-made pile, the method of placing concrete inside the pile head pile diameter in the upper pile as described above may be seismic reinforcement because the pile head becomes stronger, Since the filler shown in (b) is cured, it is difficult to remove the filler, and the concrete placing construction shown in (c) also takes time and cost.

  In the method of reinforcing a pile head using an outer pipe (steel pipe) as shown in Patent Document 3, the construction becomes complicated, and the outer pipe (steel pipe) and the construction work require time and cost.

  The present invention is a pile foundation in which a hollow ready-made pile having a hollow pile diameter is embedded in consideration of the above-described problems, and a pile foundation in which at least an upper pile or an upper pile pile is subjected to earthquake-proof reinforcement An object of the present invention is to provide a method for constructing a pile foundation structure that can be constructed easily without greatly changing the construction method of a conventional pile foundation structure or increasing the construction process.

  As a result of intensive studies to achieve the above object, the present inventors have filled the inside of the pile diameter of the upper pile, etc., if at least the purpose is to provide seismic reinforcement of the upper pile or the pile head of the upper pile. It is possible to use cement milk instead of concrete, and by adding a cement milk discharge function to the rotating cap used for embedding ready-made piles, the upper pile and upper The present invention has been completed by finding that seismic reinforcement can be applied to pile heads and the like of piles.

  One of the inventions related to the rotating cap of the present application is a rotating cap used when embedding a hollow ready-made pile in a pile hole provided in the ground, and the rotating cap has an open bottom and an upper bottom in the center. The rod has an upper bottom surface with an opening that can be moved up and down, and a cylindrical rotating cap body provided with holding means for holding the hollow ready-made pile, and upward from the upper bottom surface of the rotating cap body A tube body that is an outer tube of the rod that is erected integrally with the rotating cap body, and the tube body includes a connecting means that can be detachably connected to the rod. It is a rotating cap.

  The rotary cap of the present invention is provided with a holding means for holding a hollow ready-made pile as in the prior art, and a rod (discharge liquid supply rod) for injecting discharge liquid into the pile diameter of the hollow ready-made pile. The structure can be used in combination.

  The rotating cap according to the present invention is formed by integrating a rotating cap body and a tubular body that is an outer tube of a rod.

  The rotating cap main body is a cylindrical thing provided with the holding means for holding the same hollow ready-made pile as before, and the lower bottom part is opened. The holding means holding or lifting a hollow ready-made pile. As said holding means, the notch part provided in the outer peripheral side surface of the cylinder of the said rotation cap main body which can engage with the protrusion provided in the outer peripheral surface of the pile head of the said hollow ready-made pile is mentioned, for example. By engaging (or fitting) the notch and the protrusion, the pile can be grasped and suspended.

  As described above, the rotating cap body has an open bottom surface but an upper bottom surface having an upper bottom surface. In the center of the upper bottom surface, an opening is provided through which the rod can be moved up and down. By having this opening, the hollow ready-made pile can be used in combination with a rod for injecting discharge liquid into the pile diameter (discharge liquid supply rod). A ready-made pile embedding device having a mechanism for injecting the discharge liquid into the pile diameter inside the hollow ready-made pile can be easily obtained.

  In addition, the rod (discharge liquid supply rod) is provided with a drilling rod provided with a discharge port that can discharge (inject, spray) discharge liquid (cleaning water, cement milk, etc.) into a pile hole, for example, An injection tube equipped with the discharge port.

  The tubular body is erected integrally with the rotating cap body from the upper bottom surface of the rotating cap body upward. When both the rotating cap main body and the pipe body are made of steel, the integration thereof is performed by, for example, welding.

  The tubular body is provided to be an outer tube of the rod when the rod is inserted into the opening of the rotating cap body. By providing such an outer pipe, simultaneous rotation of the rotating cap and the rod, and rotation of the rod alone are possible, respectively, so that the pile diameter of the pile holding the pile can be filled with cement milk, the pile diameter It is easy to discharge the mixture of pile periphery fixing liquid and excavated sediment that has been filled inside, and the quality of the cement milk filling is improved. The pile falls into the excavation hole or moves horizontally when filling with cement milk. There are various merits such as preventing the occurrence of the problem, and adjusting the position of the hollow ready-made pile buried after filling with the cement milk.

  The inner diameter of the tube is equal to or greater than the diameter of the rod joint (joint portion) at which the inner surface of the tube does not contact the outer surface of the rod joint, and the tube length of the tube is about 1 m to 15 m. The tube body is provided with connection means that can be detachably connected to the rod. The rod referred to here is the above-mentioned discharge liquid supply rod or Yatco rod (intermediate rod from the rotary drive device).

  Examples of the connecting means include means such as “a pin is inserted into a hole of a tubular body and connected to a pin fixing portion of a rod”. The connecting means is not particularly limited as long as the tube body and the rod rotate coaxially by the connection.

  This rotating cap can also be used when laying a lower pile or middle pile in the construction of a pile foundation with hollow ready-made piles, but in particular, by combining with a discharge liquid supply rod for discharge liquid such as cement milk, Can be effectively used to bury and bury cement milk inside the pile diameter of the upper pile.

  Another one of the inventions of the present application is that a hollow ready-made pile is embedded in a pile hole filled with a mixture of a pile periphery fixing liquid and excavated earth and sand, and the inside of the pile diameter of the hollow ready-made pile as an embedded upper pile Is an off-the-shelf pile embedding device equipped with the cement milk discharge port used when constructing a pile foundation structure filled with cement milk, which can be inserted into the rotating cap and the opening of the rotating cap. It is a ready-made pile embedding apparatus characterized by having a discharge liquid supply rod.

  As a pile foundation structure in light of the above-mentioned object of the present invention, a hollow ready-made pile is embedded in a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and the hollow ready-made pile as an embedded upper pile A pile foundation structure filled with cement milk can be considered inside the pile diameter.

  This pile foundation structure is a structure of a pile foundation made of hollow ready-made piles built in the ground as the foundation of an upper structure such as a building or footing.

  The pile hole in which the hollow ready-made pile is buried is formed by a conventional method by an excavator such as an earth auger. The shape and dimensions of the pile hole are not particularly limited. For example, a straight shape, an expanded bottom portion, or a node shape.

  As in the prior art, the pile hole is filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and a ready-made pile having a hollow pile diameter is embedded before the mixture does not harden. The bottom of the pile hole may be filled with a root-setting liquid or a mixture of the root-setting liquid and excavated earth and sand instead of the mixture. The pile circumference fixing liquid and the root hardening liquid may be those conventionally used, and these types are not particularly limited.

  The kind of the ready-made pile with a hollow pile diameter embedded in the pile hole is not particularly limited. Examples thereof include concrete piles such as PC piles, PHC piles, and PRC piles, synthetic piles such as RC piles, steel pipe piles, and joint piles. In many cases, the pile of the pile foundation in the present invention is formed by connecting a plurality of piles such as an upper pile and a lower pile, an upper pile, a middle pile, and a lower pile by joints. In some cases, it is used as a single pile without a joint. The upper pile includes this single pile.

  The above pile foundation structure consists of a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and a pre-made pile with a hollow inside of the pile diameter is embedded. And the inside of the pile diameter of the hollow ready-made pile as the middle pile or lower pile is filled with the mixture and hardened. The inside of the pile diameter of the hollow ready-made pile 20 m or less from the upper end of the upper pile of the buried ready-made pile has a structure in which cement milk is filled and hardened. By adopting such a structure, the seismic reinforcement of the upper pile or the pile head of the upper pile, which is the object of the present invention, can be achieved.

  The reason why the filling range of the cement milk is set to 20 m or less from the upper end of the upper pile of the above-described ready-made pile is that this range is the range of the main bending moment and shearing force that acts on the pile during an earthquake. The cement milk filling range is not limited to the upper pile part because it is inside the pile diameter of the ready-made pile at 20 m or less from the upper end of the upper pile of the buried pile. Depending on the pile length, the filling range may extend to the inside of the middle pile or the pile diameter of the lower pile, and such a pile foundation structure is also included in the scope of the present invention.

  The above-mentioned cement milk is obtained by adding water to any one of various cements such as ordinary Portland cement, Portland cement such as early-strength Portland cement, mixed cement such as blast furnace cement, and eco-cement, and knead it at a water cement ratio of 50 to 150%. Is.

  If necessary, chemical admixtures such as anti-breeding agents and water reducing agents, cement admixtures such as activated silica powder, and expansion materials may be added. Moreover, since the excavated earth and sand and the pile circumference fixing liquid may be mixed in the cement milk at the time of filling construction, the cement milk including those containing these contaminants is referred to as cement milk.

The cured product of the cement milk preferably has a uniaxial compressive strength of 5 to 65 N / mm ² . By setting the strength within this range, the adhesion strength between the concrete in the pile body and the cement milk filled in the pile diameter in the hollow ready-made pile is improved, so the pile body and the cement milk behave integrally with external forces such as shaking. And sufficient seismic performance can be secured. The strength exceeding 65 N / mm ² is an excessive quality, and when it is attempted to obtain this, the strength may be improved, but the construction may become difficult or the cost may be increased.

  In order to obtain the uniaxial compressive strength in the above range, for example, cement milk in an amount more than that required for filling a predetermined filling range is injected into the filling range, and the mixture of the pile circumference fixing liquid and excavated earth and sand is mixed. The cement milk may be replaced with cement milk as much as possible, or the cement milk may be poured into the filling range after pretreatment for removing the mixture existing in the predetermined filling range with washing water.

  The ready-made pile embedding device of the present invention can be effectively used to construct the above-mentioned pile foundation structure in light of the above-described object of the present invention.

  One of the inventions related to the ready-made pile embedding device of the present application is that the hollow ready-made pile is embedded in a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and the hollow ready-made pile as an embedded upper pile A pile built-in device having the cement milk discharge port used when constructing a pile foundation structure filled with cement milk inside the pile diameter, the rotation cap and the opening of the rotation cap described above It is a ready-made pile embedding apparatus characterized by having a discharge liquid supply rod which can be inserted into the pipe.

  This ready-made pile embedding device has the above-described rotating cap of the present invention and a discharge liquid supply rod that can be inserted into the opening of the rotating cap. The rotating cap and the discharge liquid supply rod do not always exist integrally, and both are used in combination when the pile foundation structure is constructed, and are removable.

  The rotating cap is as described above. The discharge liquid supply rod is similar to a rod used in an excavator such as an earth auger, and can discharge (spray) discharge liquid such as cement milk and cleaning water on the tip of the rod and / or the side of the rod. An outlet (including a nozzle) is provided. The discharge port is not particularly limited as long as the discharge liquid has a diameter and shape that can be ejected at a low pressure to a high pressure. It may be the same as the conventional discharge port provided on the rod of the earth auger.

  It is preferable that the discharge port is a nozzle and the tip of the nozzle has a structure in which the discharge liquid can be ejected in various directions at different angles or simultaneously, since the above-described cement milk can be filled efficiently.

  The discharge liquid supply rod is hollow inside, and a supply pipe for supplying the discharge liquid to the discharge port is arranged. This supply pipe may be the same as the conventional supply pipe provided on the rod of the earth auger.

  When the pile diameter of the pile to be buried is small, the diameter (inner diameter) inside the pile diameter is small, so that instead of the rod, a mere injection tube having the discharge port at the tip or the tip and the outer surface of the tube is preferable. . In the present invention, the injection pipe including the injection pipe is referred to as a discharge liquid supply rod.

  The length of the discharge liquid supply rod is preferably 1 to 20 m. Within this range, it is easy to attach the cap, rod and head to the standard length leader of the pile driver, and it is easy to insert the head and rod into the pile diameter. Injection into the pile diameter is easy. As mentioned above, the length of the cement milk filling range may be longer than the pile length of the upper pile, in which case the length of the discharge liquid supply rod is longer than the pile length of the upper pile and filled. Also good. As described above, in the pile foundation structure according to the present invention, cement milk is filled into the pile diameter inside the pre-made pile at 20 m or less from the upper end of the upper pile of the pre-made pile, so that the total length of the discharge liquid supply rod It is not necessary to lengthen (including those in which a plurality of rods are connected) longer than 20 m.

  The discharge liquid supply rod (excluding the injection pipe) is a drilling head having a discharge liquid discharge port at a tip portion via a joint portion, or a drilling rod having the drilling head, a stirring blade, and a discharge liquid discharge port Is preferably attached. If there is a stirring blade, the mixture inside the pile diameter can be eliminated, or the mixture remaining in the pile diameter and the cement milk can be easily stirred, and the quality of the filled cement milk can be ensured and the strength, quality, etc. Variation can be reduced. In the present invention, the excavating head or the rod to which the excavating rod is attached is referred to as a discharge liquid supply rod.

  The stirring blade is of a blade shape, a screw type (spiral type), or the like. Of these, a screw type (spiral type) is preferable. If it is this, since the filling (mixture of pile circumference fixing liquid and excavation earth and sand) with which the inside of the pile diameter of a hollow ready-made pile was filled will be easy to discharge | emit on the ground, injection | pouring of cement milk will become easy. The size of the stirring blade is preferably equal to or less than the diameter of the following drilling head, and the installation position of the stirring blade is not particularly limited, and a plurality of blades may be at arbitrary positions, but one of them is directly above the drilling head. It is desirable to be near the joint.

  Moreover, it is preferable that the tip of the discharge liquid supply rod (excluding the injection pipe) is provided with an excavation head having a discharge liquid discharge port. By rotating the excavation head, the mixture of the uncured pile circumference fixing liquid and the excavation earth and sand filled in the pile diameter is easily excavated and pushed upward, so that the mixture can be easily removed. .

  This excavation head is the same as that attached to the tip of the earth auger. For example, there is an excavation claw at the tip, and a spiral plate of half or more turns is attached.

  In addition to the stirring blade and the excavation head, the excavation rod is provided with a discharge port for discharge liquid as necessary. The installation position of the discharge port is the same as the position provided on the excavation head and the stirring rod in the conventional earth auger. As described above, if the excavation head or the excavation rod is provided with the discharge port, it is not always necessary to provide the discharge port on the rod above the excavation rod in the discharge liquid supply rod.

  In addition to the above-mentioned discharge liquid supply rod, when the pile diameter of the prefabricated pile to be embedded is small, the discharge liquid supply rod is connected to an injection pipe provided with a discharge liquid discharge port at the tip part or the tip part and the outer surface part of the pipe. You can also If the injection pipe is used, the inside of the pile diameter of the cement milk can be filled even if the inside diameter of the pile is small by considering the position of the discharge port, the injection pressure of the cement milk, the injection angle, etc. Become.

  When constructing the pile foundation structure using the ready-made pile embedding device of the present invention, the tube body (outer tube) is fixed in order to prevent the pile from dropping into the pile hole and preventing the horizontal pile core from shifting. Is preferred.

  The fixing method is not particularly limited, but from the viewpoint of workability, it is preferable that the ready-made pile burying device is provided with a tube fixing means.

  This tubular body fixing means exists separately from the rotating cap and the discharge liquid supply rod, and when the pile foundation structure is constructed using the ready-made pile embedding device, the rotation cap and the discharge liquid supply Used in combination with a rod.

  This tube fixing means includes, for example, a fixing plate having a position adjusting means and a receiving base for the fixing plate, a wire used by being attached to the leader, and a fixing jig attached to the leader.

  Among them, a fixing plate including a position adjusting means and a pedestal for the fixing plate is preferable because it is easy to hold the pile horizontally and can hold the pile weight on the ground, so that the stability is high. The cradle is made of, for example, two H-shaped steels, and is used by being installed so as to be parallel to the ground. The fixing plate provided with the position adjusting means is plate-shaped and has a specification in which the bracket can be attached to an arbitrary position. The position adjusting means is, for example, a jack and a bracket so that the pile is horizontal and the fixing plate is horizontal. Height adjustment is performed. By providing the position adjusting means, it becomes easy to fix the pile head position at the planned position.

  One of the inventions related to the method for constructing a pile foundation structure of the present application is that a hollow ready-made pile is buried in a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and at least a part of the inside of the pile diameter of the upper pile Or it is the construction method of the pile foundation structure which builds the pile foundation structure in which all the cement milk is filled, Comprising: When burying the said hollow ready-made pile as an upper pile at least, either of the said Claims 2-7 Using the ready-made pile embedding device according to one item, the discharge fluid supply rod of the ready-made pile embedding device is inserted into the opening of the rotary cap body, and the discharge fluid supply rod and the intermediate rod from the rotation drive device The rotating cap and the discharge liquid supply rod or the intermediate rod are connected by the connecting means of the tubular body, and the holding hand provided on the rotating cap body. By holding the hollow ready-made pile, the hollow ready-made pile is buried by self-spinning rotation, the upper pile is installed in the pile hole, the tubular body is fixed by the tubular body fixing means, and the connection is completed after the upper pile installation is completed. The connection by means is released and the discharge liquid supply rod or the intermediate rod is removed from the tube body, and the discharge liquid supply rod is used as an upper pile, and the hollow ready-made pile has a predetermined position toward the lower pile inside the pile diameter. The cemented milk is discharged from the discharge port while raising and lowering the discharge liquid supply rod while holding the hollow ready-made pile as an upper pile by the holding means of the rotating cap body, and the hollow ready-made The pile foundation structure is constructed by filling a predetermined range inside the pile diameter of the pile with cement milk to construct the pile foundation structure.

  The pile foundation structure to be built by this construction method is that a hollow ready-made pile is buried in a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and at least partly or entirely inside the pile diameter of the upper pile. A specific pile foundation structure such as a pile foundation structure filled with cement milk, the details of which are as described above.

  In the construction method of the present invention, when at least a hollow ready-made pile as an upper pile is embedded, any of the above-mentioned ready-made pile embedding apparatuses of the present invention is used. The details of these ready-made pile embedding devices are as described above.

  In the construction method of the present invention, first, a pile hole filled with a mixture of pile fixing liquid and excavated earth and sand is formed by a conventional method using an excavator such as an earth auger. Next, before the mixture hardens, a hollow ready-made pile other than the upper pile is embedded in the pile hole by a conventional method.

  When burying hollow ready-made piles as lower piles or middle piles, a conventional ready-made pile burying device (rotating cap) may be used, but the rotating cap of the present invention described above, or as described above, You may use the ready-made pile burying apparatus of this invention. The embedding method is performed according to the conventional method or the embedding method of the present invention used when embedding the hollow ready-made pile as an upper pile described later.

  When embedding a hollow ready-made pile as an upper pile, first, the discharge liquid supply rod in the ready-made pile embedding apparatus of the present invention is inserted into the opening of the rotary cap body and rotated with the discharge liquid supply rod. An intermediate rod (a rod disposed immediately above the discharge liquid supply rod) from the drive device is connected via a joint portion, and the rotating cap and the discharge liquid supply rod are connected by the connecting means provided in the tube body. Or the said intermediate | middle rod is connected, the assembly of the ready-made pile burying apparatus of this invention and attachment to a rod are performed.

  And the said hollow ready-made pile is hold | maintained by the said holding means provided in the said rotation cap main body of the said ready-made pile embedding apparatus of this invention, this hollow ready-made pile is embed | buried by self-spinning rotation, and an upper pile is installed in the said pile hole To do. The discharge liquid supply rod has a shape inserted into a pile diameter inside the hollow ready-made pile (upper pile).

  Next, in order to prevent the pile from dropping into the pile hole and the horizontal displacement of the pile core, the tube is fixed to the cradle by holding the bracket with a jack by the tube fixing means.

  After completion of the upper pile installation, the connection by the connecting means is released, and the discharge liquid supply rod or the intermediate rod is detached from the tube body, and the discharge liquid supply rod is removed from the upper pile to the lower pile. You can move up and down freely.

  Thereafter, the discharge liquid supply rod that can be raised and lowered freely up and down by releasing the connection is inserted deeper into a predetermined position toward the lower pile inside the pile diameter of the hollow ready-made pile as the upper pile, While holding the hollow ready-made pile as an upper pile by the holding means of the rotating cap body (while holding the buried foundation pile), the discharge liquid supply rod is lifted and lowered from the discharge port provided in the excavation head or the like Cement milk is discharged, and a predetermined range inside the pile diameter of the hollow ready-made pile such as an upper pile is filled with cement milk.

  As described above, in the construction method of the present invention, the filling of cement milk is performed while holding the hollow ready-made pile as the upper pile by the holding means of the rotating cap body (while holding the buried foundation pile). The effect of preventing the pile from falling into the pile hole and preventing horizontal misalignment of the pile is produced.

  The filling of cement milk is not limited to a part or all of the inside of the pile diameter of the upper pile, the inside of the pile diameter from the upper pile to the middle pile, or the pile diameter from the upper pile to the lower pile You may go to a predetermined range inside. In the method for constructing a pile foundation structure according to the present invention, when filling the cement milk, the length of the intermediate rod or the discharge liquid supply rod is increased as necessary, or a plurality of auxiliary rods (auxiliary intermediate rods, auxiliary By connecting the discharge liquid supply rod, auxiliary excavation rod, etc.) and extending the overall length of the rod, the discharge liquid supply rod can be filled so as to reach the inside of the pile diameter of the middle pile and the lower pile. .

  The cement milk is filled in the process by raising and lowering the discharge liquid supply rod up and down once or a plurality of times. If the excavation head or the excavation rod is attached to the tip of the discharge liquid supply rod, the pile circumference fixing liquid and the excavation filled inside the pile diameter while the discharge liquid supply rod is raised and lowered up and down Mixture with earth and sand is easy to eliminate.

  Moreover, you may perform discharge of the cement milk from the said discharge outlet of the said discharge liquid supply rod (filling into the pile diameter inside of a hollow ready-made pile) after pre-processing the pile diameter inside of the said hollow ready-made pile.

  For example, as the discharge liquid supply rod, a rod provided with the excavation head and a stirring blade is used, and before the cement milk is discharged, the mixture filled in the pile diameter by the excavation head and the stirring blade is put on the ground. A pretreatment such as discharging may be performed, and then a cement milk filling operation may be performed.

  Alternatively, a pretreatment such as cleaning the inside of a predetermined range of the pile diameter filled with cement milk by ejecting high-pressure washing water while raising and lowering the discharge liquid supply rod attached to the distal end of the excavation rod, Thereafter, a filling operation of cement milk may be performed. Patterns for performing such preprocessing are also included in the scope of the present invention.

  The discharge port for the discharge liquid, such as cement milk, is provided at one of the tip, the side, and both the tip and the side of the discharge liquid supply rod. When the excavation head is attached to the tip of the discharge liquid supply rod, the discharge port can be provided only in the excavation head. Moreover, when the excavation rod with an excavation head is attached to the front-end | tip part of a discharge liquid supply rod, a discharge port can also be provided only in the side surface of an excavation head and an excavation head and an excavation rod.

  The discharge liquid such as cement milk and washing water is discharged at an appropriate pressure of low to high pressure as necessary. The low pressure mentioned here is a pressure of about 2 MPa, and the high pressure is a pressure of about 18 MPa. Usually, it is a discharge pressure (injection pressure) of about 2 MPa when cement milk is discharged from the head or rod of the earth auger when the pile hole is formed. When the pressure is too low, the filling efficiency of the cement milk is deteriorated, and the quality of the filled cement milk is deteriorated due to a large amount of mixing of the mixture.

  The injection direction of the cement milk is preferably horizontal to slightly downward. In this direction, the cement milk can be easily pushed up, so that the cement milk can be smoothly filled inside the pile diameter up to the vicinity of the pile head.

  Another aspect of the invention relating to the rotating cap of the present application is a rotating cap used when a hollow ready-made pile is embedded in a pile hole provided in the ground, and the rotating cap has an upper bottom portion and a lower bottom portion opened. The upper end portion has a connecting portion with an auger joint member, and the lower end portion is provided with a holding means for holding the hollow ready-made pile. It has a connecting part that can be detachably attached to the upper end part of the cap body, the lower bottom part is opened, and the upper base part has an opening diameter larger than the outer diameter of the auger rod mounting part for attaching the rod to the auger in the center. A rotary cap having an opening and a cylindrical auger joint member for connecting the rotary cap body to the auger.

  When the pile diameter of the hollow ready-made pile is large (for example, the outer diameter of the pile is 600 mm or more), the rotary cap is attached to the tip of a rod (discharge liquid supply rod or excavation rod) inserted into the rotary cap body. It is used when the outer diameter of the rod is increased by having a large-diameter excavation head or having a spiral type stirring blade on the outer surface of the rod.

  This rotary cap is roughly composed of a vertically long cylindrical rotary cap main body having an open upper and lower bottom and a cylindrical auger joint member that can be detachably attached to the upper end of the rotary cap main body.

  The shape of the rotating cap main body is, for example, a cylindrical shape having a dimensional ratio of horizontal (outer diameter of the cylinder): vertical (length of the cylinder) = 1: 1 to 1:50. This is because the rod is accommodated in the pipe body, and if it is within the above dimensional ratio, it can be attached to a leader of a general pile construction machine, which is preferable. The outer diameter of the cylinder of the rotating cap body is not limited and limited according to the outer diameter of the hollow ready-made pile to be embedded, but is, for example, 350 to 1250 mm.

  A connecting portion for connecting (mounting) an auger joint member is provided at the upper end of the rotating cap body. The connecting portion includes, for example, a plurality of pin holes provided on the outer periphery of the rotating cap body for connecting the auger joint member with a connecting pin.

  Moreover, the lower end part is equipped with a holding means for holding the hollow ready-made pile. This holding means is the same as that provided in the conventional cylindrical rotary cap, for example, the rotary cap main body that can engage with the protrusion provided on the outer peripheral surface of the pile head of the hollow ready-made pile. The notch part provided in the outer peripheral side surface of this cylinder is mentioned. By engaging (or fitting) the notch and the protrusion, the pile can be grasped and suspended. In addition, the said holding | maintenance is hold | gripping or lifting a hollow ready-made pile.

  The auger joint member connected (mounted) above the rotating cap body is a cylindrical connecting member for directly attaching the rotating cap body to the auger, the lower bottom portion is opened, and the rotating cap body is disposed at the lower end portion. Of the rotating cap body having an opening having an opening diameter larger than the outer diameter of the rod mounting portion of the auger for mounting the rod to the auger at the center. It is a cap. The connecting part has a form corresponding to the form of the connecting part of the rotating cap body.

  In addition, since the auger joint member has an upper end connected to the auger and a lower end connected to the rotating cap body, the shape corresponds to the size and form of the connecting part of the auger and the connecting part of the rotating cap body. ing.

  In addition, since the rotary cap of the present invention has a ready-made pile embedding device of the present invention by attaching a rod such as a discharge liquid supply rod to the auger and combining it with the rod, the upper base of the auger joint member has a rod in the center. An opening having an opening diameter larger than the outer diameter of the rod mounting portion of the auger for mounting on the auger is provided. By setting the auger joint member in such a form, the auger joint member can be easily attached to the auger.

  Another one of the inventions related to the ready-made pile embedding device of the present application is that the hollow ready-made pile is embedded as a pile pile filled with a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and the hollow pre-made pile as an embedded upper pile A pile built-in device having the cement milk discharge port used when constructing a pile foundation structure filled with cement milk inside the pile diameter of the pile, It is the ready-made pile embedding apparatus characterized by having said rotating cap shown as one and the discharge liquid supply rod installed in the vertical axis direction in the center of this rotating cap.

  The pile foundation structure is as described above. The ready-made pile embedding device is composed of the above-described rotating cap shown as another invention related to the rotating cap of the present application and a discharge liquid supply rod installed in the longitudinal axis direction in the center of the rotating cap, and these are constructed. Sometimes used in combination.

  The rotating cap is as described above. The discharge liquid supply rod is also as described above, but is different from the discharge liquid supply rod in the above-mentioned pre-made pile embedding device in that an injection tube type is not used. The uppermost portion of the discharge liquid supply rod is mounted on the rod mounting portion of the auger, and is inserted through the central shaft portion of the rotary cap body.

  In the discharge liquid supply rod of this ready-made pile embedding device, the excavation head provided with the discharge liquid discharge port or the excavation head and the spiral type stirring blade and the discharge liquid discharge port through the joint at the tip part Is preferably attached. As described above, even if the discharge liquid supply rod includes a drilling rod having a drilling head or a spiral type stirring blade, the cylindrical space of the rotating cap body is wide, so that the inserted discharge liquid supply rod can be easily moved up and down. .

  Further, in the discharge liquid supply rod of this ready-made pile embedding device, it is preferable that a spiral type stirring blade is also provided on the outer surface of the discharge liquid supply rod, and excavation provided with a discharge liquid discharge port at the tip portion. If the head is attached, the discharge liquid supply rod is similar to a drilling rod having a spiral type stirring blade and a discharge liquid discharge port. Therefore, by providing a spiral type stirring blade on the outer surface of the discharge liquid supply rod, the discharge liquid supply rod can be changed to one having a part of the function of the excavation rod.

  Moreover, it is preferable that this ready-made pile embedding apparatus has a rotation cap main body fixing means for fixing the rotation cap main body in the rotation cap.

  Even when constructing the pile foundation structure using this ready-made pile embedding device of the present invention, the rotary cap body is fixed in order to prevent the pile from falling into the pile hole and preventing horizontal pile core displacement. Is preferred. The fixing method is not particularly limited, but from the viewpoint of workability, it is preferable that the ready-made pile embedding device is provided with a rotating cap body fixing means.

  The rotating cap body fixing means corresponds to the above-described tube fixing means, and this fixing means is also present separately from the rotating cap and the discharge liquid supply rod, and uses the ready-made pile embedding device. The pile foundation structure is used in combination with the rotating cap and the discharge liquid supply rod.

  This rotating cap body fixing means is also the same as the above-described tube fixing means, for example, a fixing plate provided with a position adjusting means and a cradle for the fixing plate, a wire used attached to a leader, It is a fixing jig.

  Also in the rotating cap main body fixing means, like the above-described tube fixing means, a rotating plate including a fixing plate provided with a position adjusting means and a receiving base for the fixing plate is preferable from the viewpoint of workability.

  The cradle is made of, for example, two H-shaped steels, and these are used by setting them in parallel with a pile on the ground. The fixing plate provided with the position adjusting means has a hole, and the position adjusting means adjusts the height of the fixing plate by holding a bracket attached to the fixing plate with a jack, for example. By providing the position adjusting means, it becomes easy to fix the pile head position to the planned position.

  Another aspect of the invention relating to the method for constructing a pile foundation structure of the present application is that a hollow ready-made pile is buried in a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and at least inside the pile diameter of the upper pile. A method for constructing a pile foundation structure for constructing a pile foundation structure partially or wholly filled with cement milk, and at least when burying the hollow ready-made pile as an upper pile, the ready-made pile embedding device of the present application Using the above-mentioned ready-made pile embedding device described as another one of the inventions according to the invention, mounting the discharge liquid supply rod of the pre-made pile embedding device to the rod mounting portion of the auger and attaching the rotating cap body to the auger joint It is connected to the auger via a member, the hollow ready-made pile is held by the holding means provided on the rotary cap body, and the hollow ready-made pile is buried by self-spinning rotation and installed in the pile hole up to the upper pile. The rotation cap body is fixed by the rotation cap body fixing means, and after the installation of the upper pile, the connection between the auger joint member and the rotation cap body is released with the auger joint member being attached to the auger, and the cement Adjust the length of the discharge liquid supply rod so that milk can fill a predetermined range inside the pile diameter of the hollow ready-made pile, and lower this discharge liquid supply rod to the inside of the pile diameter of the hollow ready-made pile as an upper pile. Cement milk is discharged from the discharge port while inserting the discharge liquid supply rod up and down while holding the hollow ready-made pile as the upper pile by the holding means of the rotating cap body, and deeper into a predetermined position toward the pile. The pile foundation structure is constructed by filling a predetermined range inside the pile diameter of the hollow ready-made pile with cement milk. It is a method for constructing a foundation structure.

  This construction method uses a cylindrical rotating cap body and an auger joint member as the rotating cap of the ready-made pile embedding apparatus, and the ready-made pile embedding apparatus using the rotating cap composed of the above-mentioned cylindrical rotating cap body and tube. Although it is different from the construction method using, there is no big difference in the basic process of construction.

  In this construction method, the pile foundation structure and the ready-made pile burying device are as described above. In the construction method of the present invention, first, a pile hole filled with a mixture of pile fixing liquid and excavated earth and sand is formed by a conventional method using an excavator such as an earth auger. Next, before the mixture hardens, a hollow ready-made pile other than the upper pile is embedded in the pile hole by a conventional method.

  When burying hollow ready-made piles as lower piles or middle piles, a conventional ready-made pile burying device (rotating cap) may be used, but the rotating cap of the present invention described above, or as described above, You may use the ready-made pile burying apparatus of this invention. The embedding method is performed according to the conventional method or the embedding method of the present invention used when embedding the hollow ready-made pile as an upper pile described later.

  When embedding a hollow ready-made pile as an upper pile, first, the discharge liquid supply rod of the ready-made pile embedding device is attached to the rod mounting portion of the auger and the rotating cap body is attached via the auger joint member. The ready-made pile burying device is installed in a state where it is connected to the auger on the pile head of the hollow ready-made pile by holding the hollow ready-made pile by the holding means provided on the rotary cap body. To do.

  Next, the hollow ready-made pile is self-rotated by an auger drive device and buried to a predetermined position, and a foundation pile installed in a pile hole is obtained by connecting from a lower pile to an upper pile, and the rotating cap body is It fixes by the said rotation cap main body fixing means, and it is made to prevent the fall of the pile to a pile hole and a horizontal pile core shift | offset by a rotation cap main body.

  After the installation of the upper pile, the connection between the auger joint member and the rotary cap body is released with the auger joint member attached to the auger so that the rod such as the discharge liquid supply rod can operate independently from the rotary cap. . The reason why the auger joint member remains attached to the auger is to facilitate the lifting and rotation of the rod and the recovery of the rod and the ready-made pile burying device.

  Then, the length of the discharge liquid supply rod is adjusted by connecting one or a plurality of discharge liquid supply rods so that the cement milk can fill a predetermined range inside the pile diameter of the hollow ready-made pile.

  Thereafter, the discharged liquid supply rod whose length has been adjusted is inserted deeper into a predetermined position toward the lower pile inside the pile diameter of the hollow ready-made pile as the upper pile, and as the upper pile by the holding means of the rotating cap body While holding the hollow ready-made pile (that is, holding the entire foundation pile from the upper pile to the lower pile), the cement liquid is discharged from the discharge port while raising and lowering the discharge liquid supply rod, and the hollow ready-made pile The pile foundation structure is constructed by filling a predetermined area inside the pile diameter with cement milk.

  Since the discharge liquid supply rod and the rotary cap main body are separated, the buried pile can be held and the discharge liquid supply rod can be moved up and down within the pile diameter independently. The reason why the pile buried by the holding means is kept is to prevent the pile from dropping into the pile hole and to prevent the horizontal displacement of the pile core.

  When filling with a predetermined range of cement milk inside the pile diameter is completed, remove the discharge liquid supply rod added to adjust the length, and connect the rotating cap body and the auger joint member again, The discharge liquid supply rod (that is, the ready-made pile burying device) is pulled up to the ground.

  According to the method for constructing a pile foundation as described above, the pile foundation structure is constructed using a large-diameter hollow ready-made pile, or the pile foundation structure using a wide stirring blade such as a screw type stirring blade. It becomes easy to build.

  In this pile foundation construction method, the cement milk filling range, the cement milk filling method, the pretreatment inside the pile diameter, the installation form of the discharge port, and the discharge method for the discharge liquid of cement milk, etc. This is the same as described in the method of building the pile foundation shown.

  When the rotating cap of the present invention is used, when building an earthquake-resistant pile foundation structure in which a pile head reinforced by embedding a hollow ready-made pile is reinforced, the embedded hollow ready-made pile is held by the rotating cap. Cement milk can be easily filled inside the pile diameter of the hollow ready-made pile. Since the hollow ready-made pile is held by the rotating cap, the cement milk can be filled without damaging the hollow ready-made pile, and the position adjustment of the pile after filling becomes easy.

  Moreover, the ready-made pile embedding device of the present invention includes the rotating cap and the discharge liquid supply rod, and the rotation cap and the discharge liquid supply rod are detachably connected to each other. The pile and the discharge liquid supply rod can be integrated and separated, and the pile can be efficiently removed from the pile peripheral fixing liquid and the excavated earth and sand filled inside the pile diameter of the hollow ready-made pile. It becomes possible to fill the inside of the diameter with high-quality cement milk.

  Furthermore, according to the method for constructing a pile foundation structure of the present invention, the pile foundation structure can be easily constructed without greatly changing the conventional method for constructing a pile foundation structure or increasing the construction process. The pile foundation using hollow ready-made piles can be made earthquake resistant without significantly increasing construction costs.

It is a figure which shows an example of the pile foundation structure which is going to build with the construction method of this invention. It is a figure which shows an example of the rotation cap of this invention. It is a figure which shows an example of the ready-made pile burying apparatus of this invention. It is a figure which shows the example of the form of the ready-made pile burying apparatus of this invention which consists of a rotation cap which consists of a rotation cap main body and a tubular body, and a discharge liquid supply rod. (A) is an example using a discharge liquid supply rod with a drilling head having a discharge port at the tip and a drilling rod provided with a stirring blade, and (b) is a drilling head having a discharge port at the tip and a spiral type stirring blade. (C) is an example using a discharge liquid supply rod attached with an injection tube having a discharge port at the tip. It is a figure which shows an example of the construction method of the pile foundation structure of this invention using the said ready-made pile burying apparatus of this invention. (A) After burying a lower pile and a middle pile in a pile hole filled with a mixture of a root hardening liquid, a pile circumference fixing liquid, and excavated earth and sand, the ready-made pile embedding apparatus of the present invention shown in FIG. 4 (a) is used. Figure (b) shows the laying of the upper pile (after laying the foundation pile consisting of the lower pile, the middle pile and the upper pile), and the pipe body of the ready-made pile laying device as the cradle for the tube fixing means Fig. 4C is a view of releasing the connection between the tube body and the discharge liquid supply rod by removing the rotation fixing pin and fixing the tube body to the upper pile (bottom pile embedded in the rotation cap body of the rotation cap) (The foundation pile consisting of a pile, middle pile, and upper pile) is held and the tip of the discharge fluid supply rod is fixed at a predetermined position inside the pile diameter of the hollow ready-made pile (upper pile, etc.) while the tube is fixed by the tube fixing means. Until the inside of the pile diameter is filled with cement milk. Fig. 5D is a diagram in which the discharge liquid supply rod is moved up and down as appropriate to fill a predetermined range inside the pile diameter with cement milk, and Fig. 5E is a diagram illustrating the cement milk being applied to the predetermined range inside the pile diameter. After filling is completed, the tube body (rotating cap) and the discharge liquid supply rod are connected again by a rotation fixing pin, and the ready-made pile burying device of the present invention is pulled up and collected on the ground. It is a figure which shows another example of the rotation cap of this invention. It is a figure which shows another example of the ready-made pile burying apparatus of this invention, and uses the rotation cap which consists of a rotation cap main body and an auger joint member shown in the said FIG. (A) is a figure which shows the basic composition of this ready-made pile embedding apparatus, (b) is a figure which shows the structure of the ready-made pile embedding apparatus suitable for implementation. It is a figure which shows another example of the construction method of the pile foundation structure of this invention using the said ready-made pile burying apparatus of this invention. (A) is a ready-made pile embedding device of the present invention of the type shown in FIG. 7 (b) after embedding a lower pile and an intermediate pile in a pile hole filled with a mixture of a root hardening liquid, a pile periphery fixing liquid and excavated earth and sand. Figure (b) shows the upper pile piled up (after the foundation pile consisting of the lower pile, middle pile and upper pile is buried), and fixed the rotary cap body of the ready-made pile burying device. (C) The rotating cap body is fixed by setting it on the cradle of the means, and the connection between the rotating cap body and the auger joint member is released with the auger joint member attached to the auger, and the discharge liquid supply rod is added. ) Holds the upper pile embedded in the rotating cap body of the rotating cap (the foundation pile consisting of the lower pile, the middle pile and the upper pile) and holds the rotating cap body fixed by the rotating cap body fixing means, A certain discharge liquid supply Insert the tip of the rod (excavation rod) to a predetermined position inside the pile diameter of a hollow ready-made pile (upper pile, etc.) and inject cement milk from the discharge port of the discharge liquid supply rod to fill the inside of the pile diameter The figure which started, (d) is the figure which raises / lowers a discharge liquid supply rod suitably, and is filling the predetermined range inside the said pile diameter, (e) is the cement milk to the predetermined range inside the said pile diameter. After the filling is completed, the added discharge liquid supply rod is removed, and the rotary cap body and the auger joint member are connected again by the connecting pin, and the ready-made pile burying device of the present invention is pulled up and recovered on the ground. . It is a figure which shows an example of the conventional pile head reinforcement method. (A) is a diagram in which a pre-made pile is embedded in a pile hole filled with a mixture of a mixture of pile circumference fixing liquid and excavated earth and sand using a conventional rotating cap, The figure which removes the filling with which the inside of the pile diameter of a pile head is removed, (c) is a figure which shows the pile foundation which reinforced the pile head by placing concrete inside the pile diameter from which the filling was removed. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

  FIG. 1 is a diagram showing an example of a pile foundation structure 1 to be constructed by the construction method of the present invention. In this example, a pile hole 3 is provided in the ground 2, and a pile made of hollow ready-made piles (SC pile, PRC pile, PHC pile, etc.) composed of an upper pile 4 and a lower pile 5 is buried in the pile hole 3. Yes.

  In this example, the bottom of the pile hole at the bottom of the pile is filled with a root hardening liquid 7 made of cement milk. Filling the pile hole bottom with the root-setting liquid is preferable in order to strengthen the pile hole bottom, but it is not always necessary to fill the pile hole bottom. Between the pile hole peripheral wall above the pile hole bottom and the outer surface of the pile, and inside the pile diameter inside the lower pile 5 and part inside the pile diameter inside the upper pile 4 is a soil made of a mixture 6 of the pile circumference fixing liquid and excavated soil Filled with cementitious material.

The pile circumference fixing liquid is cement milk, and the mixing ratio of the pile circumference fixing liquid and the excavated earth and sand is pile circumference fixing liquid: excavated earth and sand = 1: 9 to 9: 1. It is preferable to adjust the type and composition of the pile circumference fixing liquid so that the hardening uniaxial compressive strength of the mixture 6 of the pile circumference fixing liquid and excavated earth and sand is about 0.1 to 3.0 N / mm ² . Cement milk is a slurry of a cement composition in which a cement admixture such as slag, a viscosity modifier such as bentonite, a chemical modifier such as a flow modifier, and a strength enhancer is added to cement slurry.

The pile milk inside the pile head of the upper pile 4 is filled with cement milk 8. In this example, only the pile head of the upper pile 4 is used, but the entire pile diameter inside the upper pile 4 or the inside of the pile diameter extending from the upper pile 4 to the lower pile 5 may be filled. The cured product obtained by curing the cement milk 8 preferably has a uniaxial compressive strength of 5 to 65 N / mm ² . By making it in this range, it is possible to obtain the seismic reinforcement effect without greatly deteriorating the workability and without significantly increasing the cost.

  The filling range of the cement milk 8 is preferably at least the inside of the pile diameter of the hollow ready-made pile at 20 m or less from the upper end of the upper pile 4 of the hollow ready-made pile. The reason why 20 m or less is preferable is that this range is the range of the main bending moment and shear force acting on the pile during an earthquake. When the pile length of the pile foundation exceeds 20 m, the filling range of the cement milk 8 may be set to a range exceeding 20 m as long as there is no problem in construction labor and construction cost.

  If the pile foundation constructed below the building or footing is the pile foundation structure 1 of the present invention as described above, the pile upper portion that is liable to be damaged such as buckling due to a large earthquake becomes strong, so that the pile having earthquake resistance The foundation is obtained.

  FIG. 2 is a view showing an example of the rotating cap 9 of the present invention. The rotating cap 9 includes a cylindrical rotating cap body 10 having a lower bottom open, and an outer tube of a rod that is integrally installed with the rotating cap body 10 by welding upward from the upper bottom surface of the rotating cap body 10. It consists of the tube 11 which becomes.

  The upper bottom portion of the rotating cap body 10 has an upper bottom surface (not shown) having an opening at the center where the rod can be moved up and down. A notch 12 is provided below the rotating cap body 10. This notch 12 constitutes a holding means for holding the hollow ready-made pile. The notches 12 and protrusions provided on the pile heads are engaged to suspend and hold the pile.

  On the upper and lower portions of the tube body 11, there are provided rotation fixing pins 13 as connection means so that the rotation cap 9 can be detachably connected to a rod inserted into the rotation cap 9. The rotation fixing pin 13 enables an integral behavior and a separation behavior of the rotation cap 9 and the rod.

  Moreover, in this example, the position adjustment fixing plate 14 as a fixing plate provided with the position adjustment means which comprises a tube fixing means with the form as shown in the figure is provided in the outer surface of the pipe body 11. As shown in FIG. As shown in the figure, the position adjustment fixing plate 14 is provided with a plurality of holes for height adjustment in the vertical direction, and in combination with the cradle, the hole is fixed so that the pile head position is fixed at the planned position. It is used by attaching a bracket to the bracket and adjusting the bracket with a jack.

  FIG. 3 is a diagram showing an example of the ready-made pile burying device 15 of the present invention. This ready-made pile embedding device 15 is composed of a rotating cap 9 and a discharge liquid supply rod 16, and is set as shown in the figure when in use. The rotating cap 9 is the same as that shown in FIG. 2, and the details are as described in FIG.

  The discharge liquid supply rod 16 has a double pipe structure in which an inner pipe serving as a discharge pipe for transporting the discharge liquid is installed, and discharge liquid such as cement milk can be fed to the discharge port. On the outer surface of the discharge liquid supply rod 16, a stirring blade having a size that does not come into contact with the discharge port or the inner surface of the tube can be provided as necessary.

  Further, a joint portion 17 is provided at the upper end of the discharge liquid supply rod 16 to be connected to an intermediate rod or other discharge liquid supply rod from the rotary drive device, and another discharge liquid supply rod or excavation is provided at the lower end. A joint 18 for attaching a rod or excavation head is provided. For example, if a drilling head having a discharge port is attached to the joint portion 18 at the lower end, the discharge liquid supply rod 16 with the drilling head is obtained.

  The discharge liquid supply rod 16 is inserted into the rotary cap 9 as shown in the figure, and is connected to the rotary cap 9 by a rotation fixing pin 13 to constitute a ready-made pile embedding device 15.

  FIG. 4 is a diagram showing an example of a form of the ready-made pile burying device 15 according to the present invention, which includes the rotating cap 9 including the rotating cap body 10 and the tube body 11 and the discharge liquid supply rod 16. (A) is an example using the excavation head 20 having the discharge port 19 at the tip and the discharge liquid supply rod 16 to which the excavation rod 22 having the stirring blade 21 is attached, and (b) is the excavation head having the discharge port 19 at the tip. 20 shows an example using a discharge liquid supply rod 16 to which an excavation rod 22 having a spiral type stirring blade 23 is attached, and FIG. 5C shows a discharge liquid supply rod 16 to which an injection pipe 24 having a discharge port 19 at the tip is attached. It is an example used.

  The ready-made pile burying apparatus 15 in FIG. 3A is provided with a drilling rod 22 having a drilling head 20 having a discharge port 19 below and a stirring blade 21 as a discharge liquid supply rod 16 of the ready-made pile burying apparatus 15 shown in FIG. It is a thing. The excavation rod 22 is provided with an inner pipe serving as a discharge liquid transport pipe therein, and therefore the discharge liquid supply rod 16 having an excavation head 20 having a discharge port 19 at the tip and a stirring blade 21 on the outer surface. In other words. This ready-made pile embedding device 15 is suitably used when the filling length is short.

  The ready-made pile burying device 15 in FIG. 3B is a drilling rod provided with a drilling head 20 having a discharge port 19 below and a spiral type stirring blade 23 as a discharge liquid supply rod 16 of the ready-made pile burying device 15 shown in FIG. 22 is attached. The excavation rod 22 is provided with an inner pipe serving as a discharge pipe for the discharge liquid, and thus has an excavation head 20 having a discharge port 19 at the tip, and a stirring blade 21 and a spiral type stirring blade 23 on the outer surface. In other words, the discharge liquid supply rod 16 is provided.

  As described above, the discharge liquid supply rod used in the present invention is a discharge liquid supply rod as long as it is a rod having only a discharge liquid feeding function. In addition to the above functions, the discharge liquid supply rod has a drilling function or a drilling function and a stirring function. If it is equipped, it becomes a drilling rod, and if it has only a stirring function, it becomes a stirring rod. In the present application, a rod having a discharge liquid feeding function is referred to as a discharge liquid supply rod. However, an excavation head connected to the tip of the discharge liquid supply rod is integrated, and the excavation rod and the agitation rod are connected. Those integrated with each other may be referred to as a discharge liquid supply rod.

  The ready-made pile embedding device 15 of (b) is suitably used when the filling length is long and the pile diameter is 600 mm or more. The ready-made pile embedding device 15 in (c) has an injection pipe 24 attached to the lower side as the discharge liquid supply rod 16 of the ready-made pile embedding device 15 shown in FIG. In this example, a discharge port 19 having an open / close lid is provided at the tip of the injection tube 24. The discharge port 19 is not limited to the tip, and may be provided on the outer surface of the injection tube 24 as necessary. The discharge port 19 is closed until the cement milk is filled because the opening / closing lid 25 is provided. However, when the cement milk is fed, the lid opens, so that foreign matter can be prevented from being mixed, and high quality cement milk can be filled. This ready-made pile embedding device 15 is suitably used when the pile diameter is 500 mm or less.

  Drawing 5 is a figure showing an example of the construction method of pile foundation structure 1 of the present invention using the above-mentioned ready-made pile embedding device 15 of the present invention. (A) is the ready-made product of the present invention shown in FIG. 4 (a) after burying the lower pile 5 and the middle pile 26 in the pile hole 3 filled with the root hardening solution 7 or the mixture 6 of the pile periphery fixing solution and excavated earth and sand. The figure which embeds the upper pile 4 using the pile burying apparatus 15, (b) is after burying to the upper pile 4 (after burying the foundation pile which consists of the lower pile 5, the middle pile 26, and the upper pile 4), the ready-made pile burying apparatus 15 tube bodies 11 are set on the cradle 28 of the tube body fixing means 27 to fix the tube body 11, and the rotation fixing pin 13 is removed to release the connection between the tube body 11 and the discharge liquid supply rod 16. FIG. 4C shows the upper pile 4 (the foundation pile composed of the lower pile 5, the middle pile 26, and the upper pile 4) embedded by the rotary cap body 10 of the rotary cap 9, and holds the tubular body 11 with the tubular body fixing means 27. The tip of the discharge liquid supply rod 16 is inserted into a predetermined position in the inside 29 of the pile diameter of the hollow ready-made pile (the upper pile 4 etc.) while being fixed by The figure which started the cement milk 8 injecting from the discharge outlet of the said discharge liquid supply rod 16, and having filled the pile diameter inside 29 with the cement milk 8, (d) raises / lowers the discharge liquid supply rod 16 suitably, and the said pile diameter FIG. 9E is a diagram in which the cement milk 8 is filled in a predetermined range of the inside 29, and (e) shows that the pipe body 11 is again inserted by the rotation fixing pin 13 after the filling of the cement milk 8 into the predetermined range of the pile diameter inside 29 is completed. (Rotary cap 9) and the discharge liquid supply rod 16 are connected, and the ready-made pile embedding device 15 of the present invention is pulled up and collected on the ground.

  In the construction method of the pile foundation structure of the present invention, as shown in (a), the lower pile 5 and the middle pile 26 are filled in the pile hole 3 filled with the mixture 6 of the root hardening liquid 7 or the pile periphery fixing liquid and the excavated earth and sand. Then, the upper pile 4 is buried using the ready-made pile burying device 15 of the present invention.

When burying the lower pile 5 and the middle pile 26, it is not always necessary to use the ready-made pile burying device 15 of the present invention, and the conventional rotary cap or the aforementioned rotary cap 9 of the present invention may be used.
The ready-made pile embedding device 15 is composed of the rotating cap body 10 and the tube body 11 and the discharge liquid supply rod 16 as described above, and when the upper pile 4 is embedded in the pile hole 3, it is shown in the figure. Then, the pile head of the upper pile 4 is gripped and lifted (held).

  In this example, the discharge liquid supply rod 16 is formed by connecting a drilling rod 22 having a drilling head 20 at the tip, but is not necessarily limited thereto.

  By connecting the tube body 11 and the discharge liquid supply rod 16 with the rotation fixing pin 13, the rotation cap and the discharge liquid supply rod 16 are connected and integrated, and the rotation driving device above the discharge liquid supply rod 16. When the rotary cap rotates forward via the intermediate rod 30 and the discharge liquid supply rod 16, the upper pile 4 held by the rotary cap body 10 is self-rotated and buried.

  When the upper pile 4 is buried (after the foundation pile composed of the lower pile 5, the middle pile 26 and the upper pile 4 is buried), as shown in (b), the tubular body 11 of the ready-made pile embedding apparatus 15 is replaced with the tubular body fixing means 27. The tube 11 (rotary cap) is fixed to the cradle 28 and the rotation fixing pin 13 is removed to release the connection between the tube 11 and the discharge liquid supply rod 16. By releasing the connection, the rotating cap and the rod function independently.

  As described above, the present invention is characterized in that the pile foundation structure is constructed by properly using the integral behavior and the separation behavior of the rotating cap and the rod. At this stage, the upper pile 4 is held by the fixed rotation cap 9.

  As the tube fixing means, there are a wire used for attaching to the leader, a fixing jig, and the like. The tube fixing means 27 in this example is provided on the outer surface of the H receiving base 28, the jack 31, the bracket 32, and the tube 11. The tubular body 11 is fixed on the ground by holding a bracket 32 attached to the position adjustment fixing plate 14 with a jack 31 and adjusting the position.

  Since the tube body 11 constitutes a part of the rotation cap, the rotation cap is fixed by fixing the tube body 11. The tubular body 11 is fixed because the fixed direction can prevent the pile from falling into the pile hole and can prevent the horizontal displacement of the pile core.

  By releasing the connection, the discharge liquid supply rod 16 can freely move up and down the inner diameter 29 of the pile, such as the upper pile 4, and is embedded by the rotating cap body 10 of the rotating cap as shown in (c). While holding the upper pile 4 (the basic pile made up of the lower pile 5, the middle pile 26, and the upper pile 4) and fixing the tubular body 11 by the tubular body fixing means 27, the tip of the discharge liquid supply rod 16 is a hollow ready-made pile ( The pile pile 29 is inserted to a predetermined position within the pile diameter inside 29 and the cement milk 8 is injected from the discharge port of the discharge liquid supply rod 16 to start filling the pile diameter inside 29 with the cement milk 8.

  If necessary, as described above, the mixture 6 of the pile circumference fixing liquid and the excavated earth and sand in the pile diameter inside 29 of the filling range of the cement milk 8 is removed, or the inside of the pile diameter inside 29 is pressurized water. Pretreatment such as washing with may be performed.

  The filling of the cement milk 8 into the pile diameter inside 29 is performed by ascending and descending the discharge liquid supply rod 16 as appropriate as shown in FIG. In this example, the whole pile diameter inside 29 of the upper pile 4 is filled, but from a part of the pile diameter inside 29 of the upper pile 4 or the pile diameter inside 29 or the upper pile 4 extending from the upper pile 4 to the middle pile 26. The filling range of the cement milk 8 such as the pile diameter inside 29 across the lower pile 5 is not particularly limited. It is designed appropriately from the viewpoint of construction cost and seismic reinforcement.

As shown in (e), after the cement milk 8 is filled at least in a predetermined range of the pile diameter inside 29 of the upper pile 4, the tube body 11 (rotary cap 9) and the discharge liquid supply rod 16 are again fixed by the rotation fixing pin 13. And the above-mentioned ready-made pile burying device 15 of the present invention is pulled up to the ground and recovered.
The pile foundation structure 1 according to the present invention is completed when the root hardening liquid 7, the mixture 6 of the pile periphery fixing liquid and the excavated earth and sand, the cement milk 8 in the pile diameter inside 29, and the like are cured. In this example, the pile hole 3 has a straight shape, and the pile to be embedded is also a straight pile. However, the pile hole 3 is not limited to these, and the pile hole 3 has an enlarged portion such as a bottom expanded portion. Or, if the pile is a hollow ready-made pile, it may be a deformed pile such as an enlarged diameter pile or a node pile.

  As described above, according to the method for constructing a pile foundation structure of the present invention, the pile foundation structure 1 can be easily constructed without greatly changing the construction method of the conventional pile foundation structure or increasing the construction process. It is possible to achieve earthquake resistance of pile foundations using hollow ready-made piles without complicating construction or significantly increasing construction costs.

  FIG. 6 is a view showing another example of the rotating cap 9 of the present invention. The rotation cap 9 includes a vertically long cylindrical rotation cap body 35 and a cylindrical auger joint member 36. As shown in the drawing, the vertically long cylindrical rotary cap body 35 and the cylindrical auger joint member 36 are detachably connected by a connecting pin 37. The reason why the rod is detachable is to facilitate mounting / removal of the rod to / from the auger and insertion of the rod into the rotary cap body 35.

  The connection between the two is not limited to such a connection means, and may be performed by a connection means such as a hook or a screw.

  Examples of the connecting pin 37 include a connecting bolt and a perforated pin. This rotation cap 9 is suitably used when the pile diameter is 600 mm or more and the filling range is long.

  As shown in the drawing, the rotating cap body 35 is a vertically long cylindrical shape with an upper bottom portion and a lower bottom portion opened, and the lower portion is similar to the rotating cap body 10 described above to grip the upper portion of the pile. The notch 12 which comprises the holding means of this pile is provided.

  Further, a connecting hole (connecting portion) for connecting to the auger joint member 36 by a connecting pin 37 is provided at the upper end of the rotating cap body 35 as shown in the figure. Further, a position adjustment fixing plate 14 that constitutes a rotating cap body fixing means is provided on the outer surface of the rotating cap body 35, similarly to the rotating cap body 10 described above.

  In this example, the auger joint member 36 is a cap (lid) of the rotary cap body 35 that is formed of a cylinder having a substantially trapezoidal longitudinal section. The longitudinal section is substantially trapezoidal because the auger joint member 36 is a connecting member that connects the auger and the rotary cap body 35, so that the upper end portion matches the size of the connecting portion of the auger and the lower end portion is This is because it is adapted to the dimensions of the connecting portion of the rotating cap body 35. Therefore, the auger joint member 36 is not necessarily limited to the shape shown in the figure, and is determined by the shape and dimensions of the auger connecting portion and the connecting portion of the rotating cap body 35.

  The auger joint member 36 has a connecting hole (connecting portion) that can be detachably attached to the upper end portion of the rotating cap body 35 by a connecting pin 37 at the lower end portion, the lower bottom portion is opened, and the upper bottom portion is a rod at the center. Has an opening with an opening diameter larger than the outer diameter of the rod mounting portion of the auger (not shown). Therefore, the image of the auger joint member 36 in this example is like a pan lid having an opening at the center of the upper base.

  FIG. 7 is a view showing another example of the ready-made pile embedding device 15 of the present invention, which uses a rotating cap comprising the rotating cap body 35 and the auger joint member 36 shown in FIG. (A) is a figure which shows the basic composition of this ready-made pile burying apparatus 15, (b) is a figure which shows the structure of the ready-made pile burying apparatus 15 suitable for implementation.

  The ready-made pile burying device 15 basically includes a rotating cap including a rotating cap body 35 and an auger joint member 36 and a discharge liquid supply rod 16, and is set and used as shown in FIG.

  The rotating cap is as described in FIG. The discharge liquid supply rod 16 is the same as the discharge liquid supply rod 16 of FIG. 3, but a larger diameter than the discharge liquid supply rod 16 shown in FIG. 3 can be used if necessary.

  The discharge liquid supply rod 16 has a double pipe structure in which an inner pipe serving as a discharge pipe for transporting the discharge liquid is installed, and discharge liquid such as cement milk can be fed to the discharge port. A laterally extending stirring blade such as a spiral type stirring blade or bar can be provided on the outer surface of the discharge liquid supply rod 16 as necessary.

  Further, a joint portion 17 is provided at the upper end of the discharge liquid supply rod 16 to be connected to an intermediate rod or other discharge liquid supply rod from the rotary drive device, and another discharge liquid supply rod or excavation is provided at the lower end. A joint 18 for attaching a rod or excavation head is provided. For example, if a drilling head having a discharge port is attached to the joint portion 18 at the lower end, the discharge liquid supply rod 16 with the drilling head is obtained.

  In this example, the position adjustment fixing plate 14 constituting the rotation cap main body fixing means is provided on the outer surface of the rotation cap main body 35. However, the position adjustment fixing plate 14 is indispensable because it is unnecessary depending on the rotation cap main body fixing means. It is not a requirement.

  In this ready-made pile burying device 15, it is preferable to use the discharge liquid supply rod 16 to which a drilling head having a discharge port or a drilling rod having a discharge port is attached at the lower end. Among them, as shown in (b), a drilling rod 22 having a drilling head 20 is attached to the lower end, and a spiral type stirring blade 23 is provided on the entire outer surface of the drilling rod 22 and the discharge liquid supply rod 16. The one using the liquid supply rod 16 is preferable because it can easily remove the earth and sand inside the pile diameter.

  The excavation rod 22 can be regarded as the discharge liquid supply rod 16 having the excavation head 20 attached to the tip and the spiral type agitating blade 23 provided on the entire outer surface. The head 20 may be attached and a spiral type stirring blade 23 may be provided on the entire outer surface.

  Thus, the discharge liquid supply rod can be provided with not only a discharge liquid feeding function but also a drilling function or a drilling function and a stirring function.

  FIG. 8 is a diagram showing another example of the method for constructing the pile foundation structure 1 of the present invention using the above-described ready-made pile embedding device 15 of the present invention. (A) is the present invention of the type shown in FIG. 7 (b) after the lower pile 5 and the middle pile 26 are buried in the pile hole 3 filled with the root hardening liquid 7 or the mixture 6 of the pile periphery fixing liquid and the excavated earth and sand. The figure which embeds the upper pile 4 using the ready-made pile embedding apparatus 15 of FIG. 1, (b) is after burying to the upper pile 4 (after burying the foundation pile which consists of the lower pile 5, the middle pile 26, and the upper pile 4), ready-made pile The rotating cap body 35 of the burying device 15 is set on the receiving base 28 of the rotating cap body fixing means 38 to fix the rotating cap body 35, and the rotating cap body 35 and the auger joint are attached with the auger joint member 36 attached to the auger 39. The figure which cancels | releases connection with the member 36, and adds the discharge liquid supply rod 16, (c) is the upper pile 4 (it consists of the lower pile 5, the middle pile 26, and the upper pile 4 embedded with the rotation cap main body 35 of a rotation cap. Rotating cap book holding foundation pile) 35, the tip of the discharge liquid supply rod 16 (excavation rod 22) with the excavation head 20 at the lower end is fixed at a predetermined position within the pile diameter inside 29 of the hollow ready-made pile (upper pile 4 or the like). FIG. 4D is a diagram in which the cement milk 8 is injected from the discharge port of the discharge liquid supply rod 16 and the pile diameter inside 29 starts to be filled with the cement milk 8. FIG. FIG. 5E is a diagram illustrating filling the cement milk 8 into a predetermined range of the pile diameter inside 29, and (e) shows the discharge liquid supply rod 16 added after the filling of the cement milk 8 into the predetermined range of the pile diameter inside 29 is completed. Is removed, and the rotating cap body 35 and the auger joint member 36 are connected again by the connecting pin 37, and the ready-made pile burying device 15 of the present invention is pulled up to the ground and recovered.

  In the construction method of the pile foundation structure of the present invention, as shown in (a), the lower pile 5 and the middle pile 26 are filled in the pile hole 3 filled with the mixture 6 of the root hardening liquid 7 or the pile periphery fixing liquid and the excavated earth and sand. Then, the upper pile 4 is buried using the ready-made pile burying device 15 of the present invention.

  When burying the lower pile 5 and the middle pile 26, it is not always necessary to use the ready-made pile burying device 15 of the present invention, and the conventional rotating cap or the rotating cap 9 of the present invention shown in FIG. 6 may be used. .

  The ready-made pile embedding device 15 is composed of the rotation cap composed of the rotation cap body 35 and the auger joint member 36 and the discharge liquid supply rod 16 as described above, and when embedding the upper pile 4 in the pile hole 3, as shown in FIG. Set as shown and grip and lift (hold) the pile head of the upper pile 4.

  In this example, the discharge liquid supply rod 16 has the excavation head 20 at the tip and is provided with a spiral type stirring blade 23 on the outer surface, so it can be regarded as the excavation rod 22 with the excavation head 20 at the tip. it can.

  The rotating cap composed of the rotating cap body 35 and the auger joint member 36 connected by the connecting pin 37 is directly attached to the auger 39. Further, the discharge liquid supply rod 16 is mounted on the rod mounting portion 40 of the auger 39. In this manner, the ready-made pile burying device 15 of the present invention is directly attached to the auger 39, and the upper pile 4 gripped by the rotary cap body 35 is self-sunk when the auger 39 rotates and the rotary cap rotates forward. It rotates and is buried in the pile hole 3.

  When the upper pile 4 is buried (after the foundation pile consisting of the lower pile 5, the middle pile 26 and the upper pile 4 is buried), as shown in (b), the rotation cap body 35 of the ready-made pile embedding device 15 is fixed to the rotation cap body. The rotating cap body 35 is fixed by being set on the cradle 28 of the means 38, and the connecting pin 37 is removed while the auger joint member 36 is attached to the auger 39 to connect the rotating cap body 35 and the auger joint member 36. To release. By releasing the connection, the rotating cap and the rod function independently, and the additional discharge liquid supply rod 16 can be connected as shown in the figure.

  As described above, this method of the present invention is also characterized in that the pile foundation structure is constructed by properly using the integral behavior and the separation behavior of the rotating cap and the rod. At this stage, the upper pile 4 remains held by the fixed rotation cap body 35.

  The rotating cap body fixing means includes a wire attached to the leader and a fixing jig. The rotating cap body fixing means 38 in this example is similar to the above-described tube fixing means 27, and includes the H receiving base 28 and the jack 31. And the bracket 32 and the position adjustment fixing plate 14 provided on the outer surface of the rotation cap body 35. The rotation cap body 35 holds the bracket 32 with a jack 31 and adjusts the position to be fixed on the ground. The reason why the rotation cap body 35 is fixed is that the fixed direction can prevent the pile from falling into the pile hole, prevent the horizontal pile core from shifting, and the like.

  By releasing the connection, the discharge liquid supply rod 16 can freely move up and down the inside 29 of the pile diameter such as the upper pile 4. Therefore, as shown in (c), the upper pile 4 embedded by the rotary cap body 35. The tip (excavation head 20) of the discharge liquid supply rod 16 is held while holding the rotary cap main body 35 by the rotary cap main body fixing means 38 while holding (the foundation pile consisting of the lower pile 5, the middle pile 26, and the upper pile 4). A hollow ready-made pile (such as the upper pile 4) is inserted up to a predetermined position within the pile diameter inside 29, and the cement milk 8 is sprayed from the discharge port of the discharge liquid supply rod 16 (in this example, the discharge port of the excavation head 20). The inside of the pile diameter 29 is started to be filled with the cement milk 8.

  If necessary, as described above, the mixture 6 of the pile circumference fixing liquid and the excavated earth and sand in the pile diameter inside 29 of the filling range of the cement milk 8 is removed, or the inside of the pile diameter inside 29 is pressurized water. Pretreatment such as washing with may be performed. In this example, since the spiral type stirring blade 23 is provided from the excavation rod to the discharge liquid supply rod (to all discharge liquid supply rods), the pretreatment is facilitated.

  The filling of the cement milk 8 into the pile diameter inside 29 is performed by ascending and descending the discharge liquid supply rod 16 as appropriate as shown in FIG. In this example, the whole pile diameter inside 29 of the upper pile 4 is filled, but from a part of the pile diameter inside 29 of the upper pile 4 or the pile diameter inside 29 or the upper pile 4 extending from the upper pile 4 to the middle pile 26. The filling range of the cement milk 8 such as the pile diameter inside 29 across the lower pile 5 is not particularly limited. It is designed appropriately from the viewpoint of construction cost and seismic reinforcement.

  As shown in (e), after filling cement milk 8 in a predetermined range of at least the pile diameter inside 29 of the upper pile 4, the added discharge liquid supply rod 16 is removed and attached to the auger 39 by the connecting pin 37 again. The auger joint member 36 and the rotary cap main body 35 are connected to each other, and the original discharge liquid supply rod 16 (excavation rod 22) is connected to the rod mounting portion 40 of the auger 39 so that the ready-made pile embedding device 15 of the present invention is placed on the ground. Pull up and collect.

  The pile foundation structure 1 according to the present invention is completed when the root hardening liquid 7, the mixture 6 of the pile periphery fixing liquid and the excavated earth and sand, the cement milk 8 in the pile diameter inside 29, and the like are cured. In this example, the pile hole 3 has a straight shape, and the pile to be embedded is also a straight pile. However, the pile hole 3 is not limited to these, and the pile hole 3 has an enlarged portion such as a bottom expanded portion. Or, if the pile is a hollow ready-made pile, it may be a deformed pile such as an enlarged diameter pile or a node pile.

  As described above, according to another pile foundation structure construction method of the present invention, even a large-diameter pile can be used without greatly changing the conventional pile foundation structure construction method or increasing the construction process. Since the pile foundation structure 1 can be easily constructed, the pile foundation using the hollow ready-made piles can be made earthquake resistant without complicated construction or significantly increasing the construction cost.

  DESCRIPTION OF SYMBOLS 1 ... Pile foundation structure, 2 ... Ground, 3 ... Pile hole, 4 ... Upper pile, 5 ... Lower pile, 6 ... Mixture of pile circumference fixing liquid and excavated earth and sand, 7 ... Root-setting liquid, 8 ... Cement milk, 9 Rotating cap, 10 Rotating cap body, 11 Pipe body, 12 Notch, 13 Rotation fixing pin, 14 Position adjusting fixing plate, 15 Pile burying device, 16 Discharge liquid supply rod, 17 Joint part, 18 ... Joint part, 19 ... Discharge port, 20 ... Excavation head, 21 ... Agitation blade, 22 ... Excavation rod, 23 ... Spiral type stirring blade, 24 ... Injection pipe, 25 ... Opening / closing lid, 26 ... Medium pile 27 ... Tube fixing means, 28 ... Receiving base, 29 ... Inside the pile diameter, 30 ... Intermediate rod, 31 ... Jack, 32 ... Bracket, 33 ... Leader, 34 ... Heavy machinery, 35 ... Rotating cap body, 36 ... Auger joint Member 37 ... connecting pin 38 ... times Cap body fixing means 39 ... auger, 40 ... rod mounting portion 41 ... conventional rotary cap, 42 ... rod, 43 ... double scoop, 44 ... concrete, 45 ... bucket

Claims (14)

A rotating cap used when a hollow ready-made pile is embedded in a pile hole provided in the ground, the rotating cap having an opening that allows the lower bottom to be opened and the upper bottom to be moved up and down in the center. A cylindrical rotating cap body having a bottom surface and provided with a holding means for holding the hollow ready-made pile, and standing upright with the rotating cap body upward from the upper bottom surface of the rotating cap body And a connecting means that can be detachably connected to the rod, and a tube fixing means is formed on the outer surface of the tube. A rotation cap characterized in that a position adjustment fixing plate as a fixing plate provided with position adjustment means is provided . A pile foundation structure in which a hollow ready-made pile is buried in a pile hole filled with a mixture of pile periphery fixing liquid and excavated earth and sand, and inside the pile diameter of the hollow ready-made pile as an embedded upper pile, cement milk is filled The prefabricated pile embedding device provided with the discharge port for cement milk used when constructing the prefabricated pile, wherein the prefabricated pile embedding device has an opening that allows the lower base to be opened and the upper base to be vertically moved up and down. A cylindrical rotating cap body having a certain upper bottom surface and provided with holding means for holding the hollow ready-made pile, and integrally with the rotating cap body upward from the upper bottom surface of the rotating cap body A rotating cap provided with a connecting means that can be detachably connected to the rod, and an upper end that can be inserted into the opening of the rotating cap. Prefabricated pile embedded device, characterized in that it comprises a discharge liquid supply rod with joint for coupling the intermediate rod or other ejection liquid supply rod from the rotary drive device.   The discharge liquid supply rod includes a drilling head provided with a discharge liquid discharge port through a joint portion at a tip portion, or a drilling rod provided with the drilling head, a stirring blade, and a discharge liquid discharge port provided as necessary. The ready-made pile embedding apparatus according to claim 2, wherein the pre-built pile embedding apparatus is attached.   The ready-made pile embedding apparatus according to claim 3, wherein a part or all of the stirring blade of the excavation rod is of a spiral type.   4. The ready-made pile according to claim 2, wherein the discharge liquid supply rod is an injection pipe provided with a discharge liquid discharge port at a tip portion or a tip portion and an outer surface portion of the tube. Buried equipment.   The ready-made pile embedding device according to any one of claims 2 to 5, wherein the pre-made pile embedding device has a tube fixing means for fixing the tube in the rotating cap. .   The prefabricated pile burying apparatus according to claim 6, wherein the tubular body fixing means comprises a fixing plate provided with a position adjusting means and a cradle for the fixing plate.   Build a pile foundation structure in which a hollow ready-made pile is embedded in a pile hole filled with a mixture of pile circumference fixing fluid and excavated earth and sand, and at least a part or all of the inside diameter of the upper pile is filled with cement milk It is a construction method of a pile foundation structure, Comprising: When burying the said hollow ready-made pile as an upper pile at least, using the ready-made pile burying apparatus as described in any one of the said Claims 2-7, this ready-made pile burying The discharge liquid supply rod of the apparatus is inserted into the opening of the rotary cap body, and the discharge liquid supply rod and the intermediate rod from the rotation drive device are connected via a joint portion, and the connecting means of the tube body The rotary cap and the discharge liquid supply rod or the intermediate rod are connected, and the hollow ready-made pile is held by the holding means provided in the rotary cap body. Buried by sinking and installing the upper pile in the pile hole, fixing the tubular body by the tubular body fixing means, releasing the connection by the connecting means after completion of the upper pile installation, The intermediate rod is removed from the tubular body, and the discharge liquid supply rod is inserted deeper into a predetermined position toward the lower pile inside the pile diameter of the hollow ready-made pile as the upper pile, and the holding means of the rotating cap body The cement milk is discharged from the discharge port while raising and lowering the discharge liquid supply rod while holding the hollow ready-made pile as an upper pile, and a predetermined range inside the pile diameter of the hollow ready-made pile is filled with the cement milk And the said pile foundation structure is constructed, The construction method of the pile foundation structure characterized by the above-mentioned.   A rotating cap used when a hollow ready-made pile is embedded in a pile hole provided in the ground, wherein the rotating cap is open at the upper and lower bottoms, and at the upper end is a connecting portion with an auger joint member A cylindrical rotating cap body provided with a holding means for holding the hollow ready-made pile at the lower end portion, and a connecting portion that can be detachably attached to the upper end portion of the rotating cap body at the lower end portion The lower bottom portion is open and the upper bottom portion has an opening with an opening diameter larger than the outer diameter of the rod mounting portion of the auger for mounting the rod on the auger in the center, for connecting the rotating cap body to the auger And a cylindrical auger joint member.   A pile foundation in which a hollow ready-made pile is embedded in a pile hole filled with a mixture of pile fixing liquid and excavated earth and sand, and inside the pile diameter of the hollow ready-made pile as an embedded upper pile, cement milk is filled A ready-made pile embedding device provided with a discharge port for the cement milk used when constructing a structure, wherein the rotation cap according to claim 9 and a discharge liquid supply installed in the longitudinal direction at the center of the rotation cap An off-the-shelf pile burying device comprising a rod.   The above-mentioned discharge liquid supply rod is equipped with a drilling head equipped with a discharge liquid discharge port or a drilling head, a spiral type stirring blade and a discharge liquid discharge port through a joint at the tip The ready-made pile embedding apparatus according to claim 10, wherein a spiral type stirring blade is also provided on an outer surface of the discharge liquid supply rod.   The ready-made pile embedding device according to claim 10 or 11, wherein the pre-made pile embedding device has a rotating cap body fixing means for fixing the rotating cap body in the rotating cap.   The ready-made pile embedding apparatus according to claim 12, wherein the rotating cap body fixing means includes a fixing plate having a position adjusting means and a cradle for the fixing plate. Build a pile foundation structure in which a hollow ready-made pile is embedded in a pile hole filled with a mixture of pile circumference fixing fluid and excavated earth and sand, and at least a part or all of the inside diameter of the upper pile is filled with cement milk It is a construction method of a pile foundation structure, Comprising: When burying the said hollow ready-made pile as an upper pile at least, using the ready-made pile burying apparatus as described in any one of the said Claims 10-13, this ready-made pile burying The discharge liquid supply rod of the apparatus is mounted on the rod mounting portion of the auger, the rotating cap body is connected to the auger via the auger joint member, and the hollow is held by the holding means provided on the rotating cap body. Holding the ready-made pile, burying the hollow ready-made pile by self-sink rotation and installing it in the pile hole up to the upper pile, fixing the rotating cap body by the rotating cap body fixing means, After the pile installation is completed, the connection between the auger joint member and the rotary cap body is released while the auger joint member is attached to the auger so that the cement milk can fill a predetermined range inside the pile diameter of the hollow ready-made pile. Adjust the length of the discharge liquid supply rod, and insert the discharge liquid supply rod deeper into a predetermined position toward the lower pile inside the pile diameter of the hollow ready-made pile as the upper pile, Cement milk is discharged from the discharge port while raising and lowering the discharge liquid supply rod while holding the hollow ready-made pile as an upper pile by a holding means, and a predetermined range inside the pile diameter of the hollow ready-made pile is set as cement milk. The pile foundation structure is constructed by filling the pile foundation structure with a pile.

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