JP2009062762A - Burying apparatus for soil-improving drain pile, and burying method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burying apparatus for a drain pile formed of crushed stones with bearing power effective in improving the soft ground. <P>SOLUTION: The burying apparatus for the drain pile comprises a pipe casing C in which a plurality of inside filling material discharge ports 13 and consolidation cam faces 14 are alternately distributed and formed at a tapered conical bit B1, and a pipe rod R in which tapered conical faces 32 serving as on-off valves for the inside filling material discharge ports 13 are formed correspondingly at a tapered conical bit B2. The tapered conical bits B1, B2 are engaged with each other to close the inside filling material discharge ports 13 with the tapered conical faces 32 when a key pin 6 on the pipe casing C side is inserted and locked into an upper end position 28a of a vertical groove part in a key groove 28 of almost L-shape on the pipe rod R side, and to open the inside filling material discharge ports 13 when the key pin 6 is replaced and locked into a horizontal groove part 28b in the key groove 28. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drain pile burying apparatus for improving soft ground and a burying method using the same.

In order to improve the soft ground of the building, the pipe casing (steel pipe) is rotated and excavated to the expected depth of the ground. At the same time as lifting, it is discharged into the excavation hole, and the construction method of burying the drain pile made of the embedded material is known, and the following patent document proposes that an opening / closing mechanism is provided at the tip (lower end) of the casing. Has been.
JP 58-189408 A Japanese Patent Laid-Open No. 3-5516 JP 7-279152 A JP-A-8-232255

  However, in the construction apparatus for crushed stone drain piles disclosed in Japanese Patent Application Laid-Open No. 58-189408, (b) even if the mechanism for closing the tip lid (3A) of the hollow tube (3) is unknown, It is inevitable that the opening and closing pivot portion with respect to the tip of the empty tube (3) will be damaged at an early stage, resulting in poor durability. (B) Since the projecting rod (4) is linearly moved up and down by repeatedly pushing the aggregate, the impact force is repeatedly applied. It is easy to collapse and it is difficult to keep the hole diameter constant. (C) When the hollow tube (3) is pulled up, the hollow tube (3) is rotated in the reverse direction. Therefore, the forward / reverse rotation drive device (5) is required, and the above-described protruding rod (4) ) Impact drive device (7) is also necessary, and the construction apparatus is complicated and expensive.

  Next, in the press-fitting mechanism such as crushed stone described in Japanese Patent Laid-Open No. 3-5516, even though the lifting mechanism (11) of the rotating shaft (4 ′) is unnecessary, (a) the cone-shaped tip shoe (8 ′ The hinge pin (12) is easily damaged. (B) In addition, in the case of the opening / closing mechanism using the hinge pin (12), a sharp and large excavation blade cannot be installed on the surface of the tip shoe (8 '), and the excavation force of the ground is inferior. (C) A screw (3 ″) having a tapered taper envelope surface (13) of the screw (3 ′) is built in the tip of the casing pipe (1 ′), and the insert is inserted by the rotational pressing force. Extrusion and extension of the tip shoe (8 ') is open, so that the required configuration is significantly complicated and specialized. (D) Rotation of the casing (1 ′) with respect to the rotation axis (4 ′) of the screw (3 ′) (3 ″) as well as the rotation drive device (6) (7) with respect to the pipe body (2 ′). A drive device (5) is also required.

  Further, in the drain pile forming apparatus disclosed in Japanese Patent Application Laid-Open No. 7-279152, even if the spiral blade (2a) is provided on the tip opening / closing lid (6) of the hollow tube (1), In addition to the motor (5) for rotationally driving the hollow tube (1), a cylinder (9) for raising and lowering the pipe rod (10) is also required, which is also complicated and expensive. (B) The vibrator (11) attached to the lower end of the pipe rod (10) is vibrated after the improvement material (17) is compacted, but the vibrator (11) has a hole diameter of the excavation hole. Compared to the extremely small product, the improved material (17) cannot be compacted efficiently, and there is a risk that the excavation hole will eventually collapse. (C) The pipe rod (10) is moved up and down, and the arm ring (12) opens and closes the open / close lid (6). However, the protruding lever (13) is mounted in a pivotal state. From here, it is inevitable to break early.

  Further, in the soft ground improvement device described in JP-A-8-232255, (a) the bottom cover (15) composed of two halves (15a) is pivotally attached to the outer pipe (5) at its upper end. Since it is only being done, it is easy to break early from here. (B) Well, the bottom lid (15) is an inverted cone that is opened by its own weight and only closed by receiving earth pressure, so it is impossible to excavate the ground reliably and efficiently. is there. (C) In addition to the motor (9) that rotationally drives the outer pipe (5), a hydraulic cylinder (4) that moves the inner pipe (2) up and down and a vibro flot (13) are also required, making it complicated and specialized To do. Then, the vibration of the vibro flot (13) may also cause the excavation hole to collapse later.

  The present invention aims to drastically solve such various problems, and in order to achieve the object, in claim 1, a spiral blade functioning as a screw auger on the outer peripheral surface as an embedding device for a drain pile for ground improvement A pipe casing of a certain length, which is shaped as a tapered conical bit having a hollow cross-section substantially V-shaped,

  As the connecting head plug, the upper end portion of the pipe casing that hangs along the rotation axis of the pipe casing is inserted and fitted into the pipe casing, and the rotation input shaft projects integrally upward from the center of the head plate. The lower end portion of the pipe casing comprises a corresponding constant length pipe rod shaped as a tapered cone bit having a substantially V-shaped cross section that can mesh with the tapered cone bit of the pipe casing,

  In the tapered conical surface of the tapered conical bit in the pipe casing, at least a pair of facing insertion material discharge ports and a plurality of compacting cam surfaces interposed between adjacent ones are arranged in an overall radially symmetrical distribution type. Forming and applying the same helical twist as the spiral blade to the compacting cam surface,

  Similarly, the key pin is integrally projected inward from the vicinity of the upper end of the outer peripheral surface of the pipe casing,

  The tapered conical surface of the tapered conical bit in the pipe rod is branched as a plurality of on-off valves that engage with the filling material discharge port on the pipe casing side, and a plurality of excavating blades project integrally outward from the tapered conical surface. As well as

  Similarly, a substantially L-shaped keyway is cut out on the outer peripheral surface of the connecting head plug in the pipe rod,

  When the key pin on the pipe casing side is inserted and locked at the upper end position of the vertical groove portion in the key groove, the filling material discharge port on the pipe casing side is blocked by the tapered conical surface on the pipe rod side. ,

  Similarly, when the key pin is replaced and locked at the horizontal end position of the horizontal groove portion in the key groove, the filling material discharge port is defined to be opened by the rising of the pipe rod.

  Further, in claim 2, the pipe rod bearing tube is fixedly supported on the rotation axis of the pipe casing by a plurality of support stays extending in a staggered arrangement in the alternating radial direction,

  The intermediate height position of the pipe rod is supported by the bearing tube so as to be movable up and down.

  In claim 3, from the midway height position of the key groove cut out in the connecting head plug of the pipe rod, an inverted L-shaped key pin extraction groove is cut out in a communication opening state,

  A proximal joint tube that hangs down integrally from the head plate of the connecting head plug, a distal joint tube that hangs up integrally from a connecting reinforcing bar having a tapered conical surface that forms a tapered cone bit, It is characterized in that it is detachably connected from a middle indirect hand tube interposed therebetween.

  According to a fourth aspect of the present invention, the diameter of the tapered conical bit, which is independent of the pipe casing itself, extends in a circular arc shape in plan view to the base end attachment ring portion of the pipe casing corresponding to the compaction cam surface. While welding multiple overhanging flanges,

  To the support base ring attached to and integrated with the tip of the pipe casing, correspondingly projecting the projecting flange of the same size and planar shape as the projecting flange on the tapered cone bit side,

  In a stacked state in which the overhanging flanges bite each other, the plurality of vertical fixing bolts are detachably joined and integrated.

  According to a fifth aspect of the present invention, an excavating blade provided with the same helical twist is integrally projected outward from a compaction cam surface of a tapered conical bit in a pipe casing.

  Further, in claim 6, an emergency lock pin in a state where the filling material discharge port on the pipe casing side is closed by the tapered conical surface on the pipe rod side is welded to the vicinity of the upper end portion of the outer peripheral surface of the pipe casing. The pin insertion port tube is inserted and locked in a freely detachable manner into a lock pin receiving hole formed corresponding to the outer peripheral surface of the connecting head plug in the pipe rod.

  On the other hand, in claim 7, as a drain pile burying method by using the burying device described in claim 1, a lifting platform that is moved up and down along the pipe rod side rotation input shaft along the leader of the ground improvement construction machine is provided. Connected and integrated with the rotational drive source equipped in a removable manner.

  First, the key pin on the pipe casing side is inserted and locked to the upper end position of the vertical groove portion in the key groove on the pipe rod side, and the insertion material discharge port on the pipe casing side is engaged with the tapered conical surface on the pipe rod side. Keep it closed,

  The pipe casing and the pipe rod, which are connected and integrated through the key pin, are rotated and driven downward in the spiraling direction of the spiral blade, and the soft ground is excavated by the both tapered cone bits,

  In the excavation process, the burrs for gravel, gravel, gravel, etc. are received by themselves from the hopper for inserting the inserts into the inside of the pipe casing.

  Once the drilling hole of the expected depth has been created in the ground, the key pin is moved in the key groove by pulling up only the pipe rod and rotating it with respect to the pipe casing stopped in the fixed state in the drilling hole. Replace and lock to the horizontal end position of the horizontal groove, and keep the filling material discharge port on the pipe casing side open,

  The pipe casing and the pipe rod, which are still connected and integrated via the key pin, are rotated and driven in the same direction as during the excavation, and then pulled up by a constant stroke, so that the pipe casing and the pipe rod are sequentially released from the inside of the pipe casing. The inside insert material to be to be loosened by the excavating blade on the pipe rod side, and the action of pressing down and compacting by the compression cam surface on the pipe casing side is repeated,

  At the final point of time when the tapered cone bit on the pipe casing side is pulled up to the ground surface, a drain pile made of a filling material is embedded and integrated in the excavation hole.

  According to the above configuration of the first aspect, the pipe casing and the pipe rod suspended along the rotation axis thereof are maintained in a connected state capable of rotating together via the former key pin and the latter key groove. Therefore, it is possible to embed a drain pile for soft ground improvement using the only rotational drive source equipped on the ground improvement construction machine, and the configuration required as a burying device is extremely simple. There is an effect that can be provided inexpensively.

  Moreover, the lower end portion of the pipe casing and the corresponding lower end portion of the pipe rod are each shaped as a tapered cone bit that can be engaged with each other, and the tapered cone bit on the pipe casing side has an overall radial symmetrical distribution type. The plurality of filling material discharge ports formed and arranged can be opened and closed with a plurality of corresponding tapered conical surfaces branched into tapered cone bits on the pipe rod side as opening / closing valves.

  And if the key pin on the pipe casing side is inserted and locked to the upper end position of the vertical groove portion in the key groove on the pipe rod side, the insert material discharge port is blocked by the tapered conical surface on the pipe rod side, If the key pin is replaced and locked to the horizontal end position of the horizontal groove portion in the key groove, the filling material discharge port is opened.

  For this reason, the open / close state of the filling material discharge port is surely and stably maintained, and in combination with the mechanism rich in rigidity, there is no risk of early breakage from such an open / close portion, and the durability is remarkably improved. Excellent.

  In addition, between adjacent adjoining material discharge ports that are distributed in the tapered conical bit on the pipe casing side is formed as a compacting cam surface for compacting the confining material, and on the compacting cam surface as a screw auger. Since a spiral twist similar to that of a functioning spiral blade is given, a plurality of excavating blades are also projected from the tapered conical surface on the pipe rod side that serves as the on-off valve for the filling material discharge port. Therefore, the excavation of the ground can be performed reliably and efficiently. In addition, the above-mentioned compaction cam surface pushes and compresses the insert material by twisting rotation, and vibration force cannot be applied. There is also an effect that the hole diameter can be kept constant.

  In that case, if the configuration of claim 2 is adopted, the lifting and lowering action of the pipe rod can be performed more smoothly and stably by the bearing pipe on the pipe casing side, and the taper side on the pipe casing side is further reduced. There is an effect that the conical bit and the tapered conical bit on the pipe rod side can be maintained in an accurate biting state.

  If the structure of Claim 3 is employ | adopted, a pipe rod can be extracted and disassembled from a pipe casing, and since the pipe rod can also be disassembled finely, operations such as maintenance, inspection and replacement can be performed conveniently. effective.

  In particular, if the configuration of claim 4 is adopted, the pipe casing itself and its tapered conical bit can be disassembled, and a large projecting flange projecting from the boundary between the two can be used to remove earth and sand when excavating the ground. The insert material pressed against the wall surface and compacted by the compaction cam surface can be prevented from escaping upward, and can also be pressed to prevent the wall surface of the drilling hole from collapsing when the pipe casing is pulled up.

  If the configuration of claim 5 is adopted, the excavation blade projecting from the consolidation cam surface on the pipe casing side, together with the excavation blade projecting from the tapered conical surface on the pipe rod side, further excavates the ground. There is an effect that can be performed smoothly and efficiently.

  Furthermore, if the configuration of claim 6 is adopted, it is necessary to fix and lock the filling material discharge ports distributed in the tapered cone bit on the pipe casing side in a closed state by the tapered cone surface on the pipe rod side. In the event of an emergency, it can be dealt with by inserting and locking the emergency lock pin, which helps to improve convenience.

  On the other hand, according to the burying method of claim 7, by using the burying device of claim 1, the pipe casing and the pipe rod are integrally rotated in the screwing direction of the spiral blade, thereby excavating the ground. Subsequent compaction of the filling material can be carried out reliably and conveniently, the rotation direction does not change even during the pulling process, and it is not necessary to reversely rotate, so there is an effect that is simple and sufficient as a rotation drive source, Excellent durability.

  In the following, the present invention will be described in detail with reference to the drawings. As shown in the overall views of FIGS. 1 to 8, the burial pile for ground improvement has an excavation hole (S) G) a pipe casing (sheath tube) (C) and a pipe rod (core) (R) that hangs along the axis of rotation thereof, and corresponding tapered cone bits (R) that bite each other ( B1) (B2) is assembled so that it can be opened and closed.

  The above main constituent members of the present invention will be described with an example of specific numerical values. First, the pipe casing (C) has a certain length (about 5.6 m), a diameter (about 38 cm) and a thickness (about about The spiral blade (1) which maintains a fixed pitch (about 50 cm) is integrally projected on the outer peripheral surface. The protruding height of the spiral blade (1) is about 3 cm, and a drilling hole (G) having a hole diameter of about 40 cm and a depth (L) of about 6 m can be created.

  In addition, the spiral blade (1) exhibits a driving force during excavation and functions as a screw auger, thereby discharging the excavated earth and sand to the ground surface. At that time, it is preferable to set the shape of the spiral blade (1) as a tapered triangle or trapezoid as shown in the figure so that the earth and sand are difficult to adhere, and even if attached, it is easy to drop.

  (2) is a radial filling material receiving opening distributed in the outer peripheral surface of the pipe casing (C) as a large number interposed between the spiral blades (1), and the filling material (3) Due to the fact that the particle size of natural crushed stone, gravel, gravel, slag, etc. used is about 2 to 4 cm, it opens in the shape of an ellipse elongated in the vertical direction with a diameter of about 10 to 25 cm.

  Further, (4) is a pipe rod bearing tube fixedly supported through a plurality of support stays (5) to a substantially intermediate height position in the pipe casing (C), and the pipe rod (R) can be moved up and down. I take charge of it. In this case, the plurality of support stays (5) are projected in a staggered state in an alternating staggered arrangement from the pipe rod bearing pipe (4) in the radial direction, and are pipe casings from the filling material receiving port (2). The filling material (3) received in (C) does not cause clogging or bridging in the interior.

  (6) is a square cylindrical or square-shaped key pin which is positioned near the head (upper end) of the pipe casing (C) and is welded in an inserted state from the outer peripheral surface thereof. The pipe rod (R) and the pipe casing (C) are kept in a connected state in which the pipe rod (R) and the pipe casing (C) can be rotated together by engaging with a key groove cut out in a connecting head plug described later in (R).

  Further, (7) is a lock pin insertion tube that is welded outwardly to the outer peripheral surface of the pipe casing (C) at a position lower than the key pin (6). The conical bit of the pipe rod (R) and the pipe casing (C) is tapered by inserting and locking an emergency lock pin (8) into a lock pin receiving hole, which will be described later, opened corresponding to the connecting head plug of R). (B2) (B1) can be fixedly locked in a closed state.

  In that case, the emergency lock pin (8) itself has not only the lock hole (9) in use but also the spare hole (10) when not in use formed in parallel therewith. The retaining pin (11) is replaced with a skewered state from the mouthpiece (7), and the lock pin (8) can be attached and moored as shown in FIGS. ing.

  On the other hand, the tapered conical bit (B1) of the pipe casing (C) is shaped as a generally hollow cross section substantially V-shaped, including its sharp cone (12), as is apparent from FIGS. Yes. In addition, a pair of facing filling material discharge ports (13) facing each other are cut out in a substantially fan shape on the tapered conical surface excluding the cone portion (12).

  From the pipe casing (C), the medium filling material (3) once received from the medium filling material receiving port (2) to the inside (E) excavation hole (G) from the pair of medium filling material discharge ports (13) ) Can be released by itself. (Α) indicates the tapered cone angle, and (β) indicates the notch opening degree of each filling material discharge port (13), both of which are approximately 70 degrees.

  And as a result of notching such a pair of filling material discharge port (13) to the tapered conical surface of the tapered cone bit (B1), a portion relatively remaining with this (the filling material discharge port (13) ) Are adjacent to each other as a pair of compression cam surfaces (14) facing each other, and the tapered conical surface is provided with a helical twist similar to that of the spiral blade (1).

  That is, the portion of the tapered conical surface of the tapered conical bit (B1) remaining as a surface area larger than the notch opening area of the insert material discharge port (13) is the pipe casing (C) shown in FIGS. When rotating in the excavation direction indicated by the arrow (A), the excavated earth and sand and the medium-filled material (3) discharged from the medium-filled material discharge port (13) are pushed down in the diameter direction (lateral direction) and tightened downward. It is shaped so that it can function as a consolidation cam surface (14) that can be hardened. It goes without saying that the compacting cam surface (14) of the tapered conical bit (B1) can exert the same driving force as the spiral blade (1) when excavating the ground (E).

  In the illustrated embodiment, the compaction cam surface (14) and the filling material discharge port (13) are distributed in a pair of allocation states facing the tapered conical surface of the tapered conical bit (B1). For example, when the pipe casing (C) has a large diameter, these pipe casings (C) may be distributed as three or more radial symmetrical types.

  Further, the tapered cone bit (B1) of the illustrated embodiment is separated and independent from the pipe casing (C) itself, as is apparent from FIGS. On the outer peripheral surface of the base end mounting ring portion (15) having the same diameter as the pipe casing (C), only a certain angle range (γ) (about 110 degrees) corresponding to the compaction cam surface (14) is provided. A pair of opposing flanges (16) having an arc shape in plan view are welded. The said cone-tip part (12) is also separately welded in the insertion state to the center of a tapered conical surface. (17) is a key groove that opens upward and is notched in the cone tip (12).

  (18) is a support base ring welded to the tip of the pipe casing (C), and its outer peripheral surface has an arc of the same size as the overhanging flange (16) on the tapered cone bit (B1) side. Formed overhanging flanges (19) are also welded as opposed pairs.

  Then, in such a stacked state where both the projecting flanges (19) on the pipe casing (C) side and the both projecting flanges (16) on the tapered cone bit (B1) side are engaged, a plurality of vertical fixing bolts ( 20) and is detachably joined and integrated. The pipe casing (C) and the tapered cone bit (B1) can be disassembled by removing the fixing bolt (20) from the biting surface. (W) is a constant band width (about 7 cm) in which the two overhanging flanges (16) and (19) are joined, and (H) is also a constant height (about about 2.cm) protruding from the outer peripheral surface of the pipe casing (C). 5 cm).

  That is, the overhanging flanges (16) and (19) in the joined state have a constant height (H) and a width (W) from the boundary between the pipe casing (C) and the tapered cone bit (B1). When the ground (E) is excavated, the earth and sand are pressed against the wall surface of the excavation hole (G) and the filling material (3) compacted by the compaction cam surface (14) does not escape upward. When the pipe casing (C) is pulled up, the wall surface of the excavation hole (G) is pressed so as not to collapse so that the hole diameter can be kept constant.

  In that case, of the both ends of the overhanging flanges (16) and (19) adjacent to the opening edge of the filling material discharge port (13), the direction of excavation rotation in the pipe casing (C) (A) It is preferable that the one end edge part which becomes the front side is sharpened as a tapered inclined surface (21) in plan view as shown in FIGS. The projecting flange (16) on the tapered cone bit (B1) side is preferably edged as a tapered inclined surface (22). This is because the resistance during excavation can be reduced.

  Next, the pipe rod (R) is made up of a plurality of steel pipes having a constant diameter (about 8 cm) and a thickness (about 1.5 cm), and the pipe rod (R) substantially corresponds to the pipe casing (C) as shown in FIGS. The length (upper end) is formed as a connecting head plug (23) with the pipe casing (C), while the tip end (lower end) is the pipe casing ( C) Shaped as a tapered conical bit (B2) that can open and close the filling material discharge port (13) on the side.

  Furthermore, as shown in FIGS. 14 and 15, the connecting head plug (23) of the pipe rod (R) has a constant diameter (about 35.6 cm) and a length to be inserted into the pipe casing (C). (Approx. 55 cm) and thickness (approx. 1.5 cm) of steel pipe. From the center of the flat head plate (24), the rotary input shaft (25) faces upward, and the proximal joint pipe (26) faces downward. As shown in FIG. (27) is a plurality of support stays for fixing and supporting the proximal joint pipe (26).

  (28) is a key groove cut out on the outer peripheral surface of the connecting head plug (23), which is substantially L-shaped when viewed from the front as shown in FIGS. A substantially inverted L-shaped key pin extraction groove (29) that opens downward is also cut out in a communicating state. Reference numeral (30) denotes a lock pin receiving hole formed on the outer peripheral surface of the connection head plug (23) independently of the key groove (28), and receives the emergency lock pin (8). .

  When excavating the ground (E), the key pin (6) on the pipe casing (C) side is inserted and locked into the upper end position (28a) of the vertical groove portion in the key groove (28) as shown in FIGS. On the other hand, when the insert material (3) is subsequently discharged into the excavation hole (G), the key pin (6) on the pipe casing (C) side also has a horizontal groove portion in the key groove (28) as shown in FIG. The horizontal end position (28b) is replaced and locked. (Y) shows the vertical distance (about 25 cm) between the upper end position (28a) of the vertical groove and the horizontal end position (28b) of the horizontal groove.

  On the other hand, the tapered conical bit (B2) of the pipe rod (R) is, as is apparent from FIGS. 16 to 19, a proximal end insertion ring portion (31) inserted into the pipe casing (C) and fitted therein, And a pair of tapered conical surfaces (32) facing each other and projecting downward as a substantially V-shaped cross section, and the tapered conical surfaces (32) branched as a pair of the conical material discharge port (on the pipe casing (C) side) By engaging with 13), they function as these on-off valves.

  (33) is a plurality of excavating blades that project integrally outward from the tapered conical surface (32) branched as a pair of facing on-off valves, and preferably have a triangular pyramid shape. A helical twist similar to that of the spiral blade (1) and the compacting cam surface (14) on the pipe casing (C) side is given, so that the propulsive force at the time of excavation can also be exhibited.

  It should be noted that it is desirable that the plurality of excavating blades (33a) protrude from the compacting cam surface (14) on the pipe casing (C) side as shown by the chain lines in FIGS. The tapered conical surface (32) that forms the tapered conical bit (B2) of the pipe rod (R) is also branched into three or more of the radial symmetrical arrangement type according to the number of allocation of the filling material discharge ports (13). It is possible that

  (34) is a horizontal connecting reinforcing bar that fixes and supports a pair of opposing tapered conical surfaces (32) branched as an on-off valve of the filling material discharge port (13) at the tip of the cone. The key protrusion (35) suspended from the portion is inserted and fitted into the key groove (17) of the cone portion (12) of the tapered cone bit (B1) on the pipe casing (C) side so as to be freely inserted and removed. , To keep the alignment state.

  Similarly, (36) is a tip joint tube that is integrally suspended upward from the center of the connection reinforcing bar (34) and hangs down from the center of the head plate (24) in the connection head plug (23). Corresponding to the proximal joint tube (26).

  (37) is a middle-indirect hand tube (R) of the pipe rod (R) held by the pipe rod bearing tube (4) on the pipe casing (C) side, and includes the proximal joint tube (26) and the distal joint tube ( 36) is detachably connected and can be disassembled so that maintenance, inspection, replacement, and the like can be performed.

  That is, the vertical joint between the proximal joint pipe (26) and the middle joint pipe (37) and the vertical joint between the middle joint pipe (37) and the distal joint pipe (36) are both shown in FIGS. The insertion shaft (38) and the receiving socket (39) are inserted and fitted to each other in a freely detachable manner, and a retaining pin (40) is inserted into the fitting portion.

  Therefore, the tapered conical bit (B1) on the pipe casing (C) side is removed from the pipe casing (C) by extracting the fixing bolt (20), and the pipe rod (R) is in the connected state. When the pin (40) is pulled out, the tapered conical bit (B2) of the pipe rod (R) is moved downward from the pipe casing (C), and the connecting head plug (23) of the pipe rod (R) is pulled out of the groove. According to (29), both can be extracted and disassembled upward from the pipe casing (C).

  As described above, the proximal insertion ring portion (31) of the tapered conical bit (B2) in the pipe rod (R) is inserted and fitted into the pipe casing (C). The outer peripheral surface of the part (31) is provided with a draft angle, and the inner peripheral surface is provided with a taper-inclined slope surface (41) for guiding the fall of the insert material (3).

  In addition, a number of air vent holes (42) are also distributed in the proximal insertion ring portion (31), and in combination with the draft angle of the outer peripheral surface, the tapered conical bit ( B2) is adsorbed to the tapered conical bit (B1) of the pipe casing (C), preventing the possibility of resistance and obstacles during the lifting operation.

  20 to 25 show the state of use of the present invention, and (M) is a power shovel, backhoe, pile driving machine, building pole car, or other suitable construction machine that is installed and fixed on the construction site for ground improvement. It is equipped with a relatively short leader support base (44), a traveling crawler (45), an outrigger (46), etc., which are operated by a hydraulic cylinder (43) so as to be undulating and rotatable.

  (47) is a fixed long leader attached and fixed to the leader support base (44), which is not shown in the figure, but has an endless transmission chain and its rotation drive motor built-in, A lift guide rail is also installed along this.

  (48) is a lifting platform that is connected and integrated with the transmission chain and moves up and down along the lifting guide rail of its leader (47). This includes a rotary drive source (49) comprising a hydraulic motor or an electric motor. (Only the housing is shown) is assembled and integrated.

  Further, (50) is a filling material injection hopper fixedly supported at the lower end of the leader (47), and the escape through hole (51) of the pipe casing (C) is provided at the bottom of the funnel. Is formed. However, the hopper (50) may be fixedly supported on the outer peripheral surface of the pipe casing (C) so as to surround at least the uppermost filling material receiving port (2). An annular elastic sealing material (52) made of a rubber tire, rubber plate, or the like as shown in FIG. 26 is fitted in the bottom of 50) in a stacked state to prevent leakage of the insert material (3) and scraping action of earth and sand. It is desirable to manage

  Therefore, in using the ground improvement drain pile embedding device according to the present invention, the pipe rod (R) is connected to the motor output shaft of the rotational drive source (49) via a chucking mechanism (not shown). The rotary input shaft (25) is detachably connected and integrated, and the operation is performed according to the following process sequence.

  That is, the key pin (6) of the pipe casing (C) suspended from the rotary drive source (49) of the elevator (48) through the through hole (51) of the hopper (50) is connected to the pipe as shown in FIGS. Inserted into the upper end position (28a) of the vertical groove portion of the key groove (28) cut out in the connecting head plug (23) on the rod (R) side and set, and the tapered conical bit on the pipe rod (R) side While the branched conical surface (32) branched from (B2) keeps the filling material discharge port (13) opened to the tapered conical bit (B1) on the pipe casing (C) side closed, the hopper (50 ), A medium-filling material (3) (preferably natural crushed stone) having water permeability and supporting force is introduced as shown in FIG.

  Then, the pipe rod (R) and the pipe casing (C), which are connected and integrated via the key pin (16), are firstly connected to the rotary drive source (49) by the arrow (A) in FIGS. The spiral blade (1) shown in the figure is rotationally driven in the screwing direction and then lowered, pushed from the ground surface of the soft ground (E), and begins to excavate as shown in FIGS.

  In the excavation process, the spiral blade (1) of the pipe casing (C), the consolidation cam surface (14) of the tapered cone bit (B1), and the excavating blade (33) of the tapered cone bit (B2) in the pipe rod (R) are propelled. The earth and sand excavated from the ground (E) are loosened by the excavating blade (33) and pushed into the wall surface of the excavation hole (G) by the compaction cam surface (14), and then tightened. Sediment (residual soil) remaining without being solidified is discharged to the ground surface by the spiral blade (1).

  In that case, if adopting a configuration in which the projecting flanges (16) and (19) are projected from the boundary between the pipe casing (C) and the tapered conical bit (B1), the earth and sand are removed from the excavation hole (G). There is an advantage that the hole diameter of the excavation hole (G) can be secured stably and stably by being pressed against the wall surface.

  On the other hand, the filling material (3) in the hopper (50) passes through the pipe casing (C) from the many filling material receiving ports (2) distributed in the outer peripheral surface as the pipe casing (C) is lowered. ) Will be accepted by itself.

  Eventually, the pipe casing (C) is pushed in from the ground surface to the planned design depth (L) as shown in FIG. 23, and it is confirmed that the support force is obtained by the formation of the tapered cone bit (B1). At the point of time, excavation of the ground (E) is finished, and the rotation of the pipe rod (R) and the pipe casing (C) is temporarily stopped. The depth (L) of the formed excavation hole (G) is, for example, about 6 m as described above.

  Furthermore, the bearing capacity (consolidation degree) in the formation is confirmed from the numerical value displayed on the digital recording part (not shown) of the construction machine (M) such as the rotational torque acting on the rotational drive source (49). can do.

  At the end of such excavation, the pipe casing (C) is stopped in a fixed state in the excavation hole (G) unless a forced rotational driving force is applied thereto. (R) is lifted by a fixed distance (Y) (about 25 cm) by the lifting platform (48) and rotated slightly in the direction indicated by the arrow (A) in FIGS. As shown in FIG. 6, the key pin (6) is replaced to the horizontal end position (28b) of the horizontal groove portion in the key groove (28) cut out in the connecting head plug (23) on the pipe rod (R) side. To do.

  Then, as is apparent from FIG. 6, the tapered cone bit (B2) on the pipe rod (R) side floats from the tapered cone bit (B1) on the pipe casing (C) side, and the tapered cone bit (B1). The filling material discharge port (13) cut out in the opening is opened.

  Therefore, the pipe casing (C) and the pipe rod (R), which are also connected and integrated via the key pin (6), are rotated in the direction of the same arrow (A) as in the excavation, As shown in FIG. 24, it is repeatedly lifted up by a predetermined stroke (S) (about 20 to 30 cm) as shown in FIG.

  That is, every time the pipe is pulled up, the filling material (3) in the pipe casing (C) is sequentially dropped and discharged from the filling material discharge port (13) to the excavation hole (G) of the ground (E). The released filling material (3) is pressed and compacted in the diametrical direction (lateral direction) and downward by the compaction cam surface (14) of the tapered conical bit (B1) on the pipe casing (C) side, Such an action is sequentially repeated.

  In particular, if a configuration in which an overhanging flange (16) (19) is overhanging from the boundary between the pipe casing (C) and its tapered conical bit (B1) is adopted, the hollow can be compacted by the consolidation cam surface (14). It is possible to prevent the material (3) from escaping upward by the overhanging flanges (16) and (19), and press the pipe casing (C) so as not to collapse the pipe casing (C). There is also an effect that can raise.

  Even in such a process, the degree of compaction of the filling material (3) is displayed on the digital recording unit (not shown) of the construction machine (M) such as the rotational torque acting on the rotational drive source (49). Since it can be confirmed from the numerical value, the pipe casing (C) and the pipe rod (R) may be pulled up every time the numerical value is confirmed (a constant reaction force is obtained).

  Then, when the tapered conical bit (B1) of the pipe casing (C) reaches the ground surface as shown in FIG. 25, the burying of the drain pile (P) made of the filling material (3) is completed in the ridge. FIG. 27 shows an improved ground obtained as a foundation of a house by embedding a large number of such drain piles (P) in a distribution state at a required interval.

It is a front view which shows the burial | buried apparatus of the drain pile concerning this invention. FIG. 2 is a cross-sectional front view of FIG. 1 showing a closed state of the filling material discharge port. It is an enlarged slope view which extracts and shows a part of FIG. FIG. 4 is an enlarged bottom view of FIG. 3. It is an expanded sectional view which follows the 5-5 line of FIG. It is a cross-sectional front view corresponding to FIG. 2 which shows the open state of a filling material discharge port. FIG. 7 is an enlarged sectional view taken along line 7-7 in FIG. It is an expanded sectional view which follows the 8-8 line of FIG. It is a slope view which extracts and shows the tapered cone bit of a pipe casing. FIG. 10 is an enlarged front view of FIG. 9. It is an enlarged bottom view of FIG. 12 is a sectional view taken along line 12-12 of FIG. It is an expanded sectional view which follows the 13-13 line of FIG. It is a front view which shows the decomposition | disassembly state of a pipe casing and a pipe rod. It is a front view which shows the assembly state of FIG. It is a front view which extracts and shows the tapered cone bit of a pipe rod. FIG. 17 is a side view of FIG. 16. FIG. 18 is a cross-sectional view taken along line 18-18 in FIG. 16. FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. 17. It is explanatory drawing which shows the attachment preparation state to a construction machine. It is explanatory drawing which shows the excavation action process of a ground. It is explanatory drawing which shows the excavation action process of the ground following FIG. It is explanatory drawing which shows the creation completion state of a digging hole. It is explanatory drawing which shows the raising action process from FIG. It is explanatory drawing which shows the embedding completion | finish state of a drain pile. It is an expanded sectional view which shows the positional relationship of a pipe casing and a filling material injection | throwing-in hopper. It is explanatory drawing which shows the ground improvement state of the house by embedding of a drain pile.

Explanation of symbols

(1) · Spiral blade (2) · Filling material receiving port (3) · Filling material (4) · Bearing tube (5) · Support stay (6) · Key pin (7) · Lock pin insertion tube (8 ) · Lock pin (9) · Lock hole (10) · Spare hole (11) · Retaining pin (12) · Cone tip (13) · Filling material discharge port (14) · Consolidation cam surface (15) · Base end mounting ring (16) (19), Overhang flange (17), Key groove (18), Support base ring (20), Fixing bolt (21) (22), Tapered slope surface (23), Connection Head plug (24), head plate (25), rotary input shaft (26), proximal joint tube (27), support stay (28), keyway (28a), upper end position (28b), lateral end position (29 ) ・ Extraction groove (30) ・ Lock pin receiving hole (31) ・ Base Insertion ring part (32), tapered conical surface (33) (33a), excavation blade (34), connecting reinforcement bar (35), key protrusion (36), tip joint pipe (37), middle indirect hand pipe (38) -Insertion shaft (39)-Receiving socket (40)-Retaining pin (41)-Tapered inclined surface (42)-Air vent hole (43)-Hydraulic cylinder (44)-Leader support base (45)-Crawler ( 46) ・ Outrigger (47) ・ Leader (48) ・ Elevator (49) ・ Rotation drive source (50) ・ Hopper (51) ・ Through hole (52) ・ Elastic seal material (A) ・ Rotation direction (B1) ( B2) ・ Tapered cone bit (C) ・ Pipe casing (E) ・ Ground (G) ・ Drilling hole (M) ・ Construction machinery (R) ・ Pipe rod (α) ・ Tapered cone angle (β) Exit cutout Degree

Claims (7)

A tapered cone bit (B1) having a spiral blade (1) functioning as a screw auger on the outer peripheral surface and a large number of filling material receiving ports (2) radially opening and distributed, and having a substantially V-shaped cross section with a hollow lower end. ) Pipe casing (C) of a certain length shaped as
The upper end portion of the pipe casing (C) that hangs along the rotation axis is a connecting head plug (23) that is inserted and fitted into the pipe casing (C), and the center portion of the head plate (24). The rotary input shaft (25) is integrally projected upward and the lower end is shaped as a tapered conical bit (B2) having a substantially V-shaped cross section that can mesh with the tapered conical bit (B1) of the pipe casing (C). A corresponding fixed length pipe rod (R),
On the tapered conical surface of the tapered conical bit (B1) in the pipe casing (C), at least a pair of filling material discharge ports (13) facing each other and a plurality of compacting cam surfaces (14) interposed between the adjacent conical material discharge ports (13). , Forming an overall radial symmetrical distribution type assignment, giving the consolidation cam surface (14) the same helical twist as the spiral blade (1),
Similarly, the key pin (6) is integrally projected inward from the vicinity of the upper end of the outer peripheral surface of the pipe casing (C),
The tapered conical surface (32) of the tapered conical bit (B2) in the pipe rod (R) is branched as a plurality of on-off valves that engage with the filling material discharge port (13) on the pipe casing (C) side, and the taper is tapered. A plurality of excavating blades (33) are integrally projected outward from the conical surface (32),
Similarly, a substantially L-shaped keyway (28) is cut out on the outer peripheral surface of the connecting head plug (23) in the pipe rod (R),
When the key pin (6) on the pipe casing (C) side is inserted and locked into the upper end position (28a) of the vertical groove portion in the key groove (28), the filling material discharge port on the pipe casing (C) side (13) is blocked by the tapered conical surface (32) on the pipe rod (R) side,
Similarly, when the key pin (6) is replaced and locked to the horizontal end position (28b) of the horizontal groove portion in the key groove (28), the filling material discharge port (13) is opened by the rise of the pipe rod (R). A ground improvement drain pile embedding device characterized in that it is determined to be. The pipe rod bearing pipe (4) is fixedly supported on the rotation axis of the pipe casing (C) by a plurality of support stays (5) protruding in a staggered arrangement in the alternating radial direction,
The drainage pile burying apparatus for ground improvement according to claim 1, wherein the bearing pipe (4) is supported so that the intermediate height position of the pipe rod (R) can be raised and lowered. From an intermediate height position of the key groove (28) cut out in the connection head plug (23) of the pipe rod (R), an inverted L-shaped key pin extraction groove (29) is cut out in a communication opening state,
A proximal joint pipe (26) that integrally hangs the pipe rod (R) from a head plate (24) of the connecting head plug (23), and a tapered conical surface (32) that forms a tapered cone bit (B2). A single joint is detachably connected from a tip joint pipe (36) that is vertically suspended from the connection reinforcing bar (34) and a middle indirect hand pipe (37) interposed between the top and bottom of the joint pipe. Item 1. A drain pile burying device for ground improvement according to Item 1. An angle range (γ) corresponding to the compression cam surface (14) of the tapered conical bit (B1), which is independent from the pipe casing (C) itself, to the proximal end mounting ring portion (15) for the pipe casing (C). While welding a plurality of large overhanging flanges (16) extending only in a circular arc shape in plan view,
An extension flange (19) having the same size and planar shape as the extension flange (16) on the side of the tapered conical bit (B1) is attached to the support base ring (18) which is attached and integrated with the tip of the pipe casing (C). Are welded correspondingly,
The ground pile for drainage improvement according to claim 1, wherein the overhanging flanges (16) (19) are detachably joined and integrated by a plurality of vertical fixing bolts (20) in a stacked state where the overhanging flanges (16) (19) are engaged with each other. Buried equipment.   The excavating blade (33a) provided with the same helical twist is integrally projected outward from the consolidation cam surface (14) of the tapered conical bit (B1) in the pipe casing (C). The burial device for drain piles for ground improvement according to claim 1.   The emergency lock pin (8) in the state in which the filling material discharge port (13) on the pipe casing (C) side is closed by the tapered conical surface (32) on the pipe rod (R) side is connected to the pipe casing (C). From the lock pin insertion tube (7) welded in the vicinity of the upper end of the outer peripheral surface to the lock pin receiving hole (30) formed corresponding to the outer peripheral surface of the connecting head plug (23) in the pipe rod (R), The drain pile embedding device for ground improvement according to claim 1, wherein the drain pile is inserted and locked freely. Using the embedding device according to claim 1, a lifting platform (48) that moves the rotary input shaft (25) on the pipe rod (R) side along the leader (47) of the ground improvement construction machine (M). ) And the rotary drive source (49) equipped with
First, the key pin (6) on the pipe casing (C) side is inserted and locked into the upper end position (28a) of the vertical groove portion in the key groove (28) on the pipe rod (R) side, and the pipe casing (C) side The inside-filling material discharge port (13) is kept closed by a tapered conical surface (32) on the pipe rod (R) side that engages with this,
The pipe casing (C) and the pipe rod (R), which are connected and integrated via the key pin (6), are rotationally driven in the screwing direction (A) of the spiral blade (1) and lowered. , Excavating the soft ground (E) with both tapered cone bits (B1) (B2),
During the excavation process, the inside insert (3) such as crushed stone, gravel, and gravel is passed through the inside insert receiving port (2) of the pipe casing (C) from the insert hopper (50). receiving,
When the excavation hole (G) having the planned depth (L) has been created in the ground (E), the pipe rod is fixed to the pipe casing (C) stopped in a fixed state in the excavation hole (G). By pulling up and rotating only (R), the key pin (6) is replaced and locked to the horizontal end position (28b) of the horizontal groove portion in the key groove (28), so that the center of the pipe casing (C) is Keep the filler discharge port (13) open,
The pipe casing (C) and the pipe rod (R), which are also connected and integrated through the key pin (6), are driven to rotate in the same direction (A) as in the excavation, while maintaining a certain stroke (S ) By pulling up one by one, loosening and acting by the excavating blade (33) on the side of the pipe rod (R) the unfilled material (3) that will be sequentially released from the inside of the pipe casing (C), and pipe Repeat the action of pressing and tightening in the diametrical direction and downward by the compaction cam surface (14) on the casing (C) side,
At the final point of time when the tapered cone bit (B1) on the pipe casing (C) side is pulled up to the ground surface, the drain pile (P) made of the insert material (3) is embedded and integrated in the excavation hole (G). An underground construction method for drainage piles for ground improvement.

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