JP6554341B2 - Construction method of foundation pile - Google Patents

Description

  The present invention relates to a method for constructing a foundation pile using a crane device that hangs a suspended object such as an excavator such as a hammer grab or a hydro grab, a casing tube, a reinforcing bar, etc., particularly in a building or a tunnel. The present invention relates to a method for constructing foundation piles in a narrow and low-flying place.

  In foundation pile construction work at a construction site, excavation work is performed using an excavator that combines a crane and a swivel boring machine. More specifically, the casing tube suspended by a crane is pushed into the soil while being swirled by a boring machine which is a press-in machine, and the soil in this casing is all-casing to be excavated by a hammer grab suspended by the crane. The construction method is used.

In this all-casing construction method, first, a clamp device, a swing motor, a hydraulic cylinder and the like provided in the boring machine are operated by a hydraulic device. The casing tube suspended from the crane is inserted into the press-fitting machine, clamped by a clamp device, and pushed into the soil by a hydraulic cylinder while being rotated by a swing motor. Next, the hammer grab suspended from the crane is used to excavate the inside of the casing tube, and the soil that has been excavated is discharged to a place away from the casing tube.

  The drilling operation with this hammer grab is performed by releasing the winch from a certain height and dropping it after lowering the suspended hammer grab into the casing tube. Due to this fall, the shell opened at the tip of the hammer grab is pierced into the soil, and when the winch is rolled up from this state, the shell is closed and the shell is rolled up with earth and sand held inside.

  The drilling in the casing tube by the hammer grab is repeated until the insertion of the casing tube and the digging by the hammer grab reach a predetermined depth while axially joining the casing tube.

  And after excavating to a predetermined depth, a hammer grab is removed from a crane, a slime process is performed as needed, and the rebar cage suspended with the crane is inserted in the excavated hole (excavation hole).

  Next, set a transport pipe (for example, Toremi pipe) for placing ready-mixed concrete in the excavation hole containing the rebar cage, and pull out the casing tube with the boring machine while placing ready-mixed concrete. Then, piles are completed in the soil as the ready-mixed concrete hardens. The foundation pile construction work is completed by the completion of the placing of the ready-mixed concrete and the pulling out of the casing tube.

  In the above-described foundation pile creation process, a wide open space is required to perform work because various devices such as a hammer grab and a casing tube are suspended from a high place by a crane. For this reason, there existed a problem that the said excavator cannot be used in the place with a roof, or a place with height restrictions, such as a tunnel.

  As a means to improve this, excavation is possible by moving the carriage in the horizontal direction along the rails of the horizontal frame that has the rails on the base machine that can run on its own, so that casing tubes and H steel can be transferred. An apparatus is disclosed in Patent Document 1 (Japanese Patent No. 4747193) and Patent Document 2 (Japanese Patent No. 5290463).

  This transfer device is placed on a self-propelled carriage and moves to a narrow work place with a limited sky. Then, a carriage with a hammer grab or the like suspended at the tip is slid horizontally along the rail, excavated from above a predetermined excavation site, and the carriage is moved to remove the excavation at a location away from the excavation site. Discard the soil.

  Moreover, the apparatus of patent document 1 is equipped with the excavation base part for press-fitting a casing tube in a base machine, and can excavate the inside of a casing tube with a hammer grab, press-fitting a casing tube by the said excavation base part. Have been described.

Japanese Patent No. 4747193 Japanese Patent No. 5290463

  The excavation apparatus described in each of the above patent documents includes a rail that extends in the horizontal direction and a carriage that moves along the rail so that the work can be efficiently performed even in a low-empty working space. A wire connected to a suspended object such as a hammer grab is taken out from the carriage, and the carriage is moved to above the excavation hole, which is a work area, to perform the work.

  However, with these devices, the carriage can only move horizontally along the rail, so it is necessary to wind up the winch or move the frame itself up and down in order to raise and lower the suspension. there were. Since the frame is fixed above the excavation hole by the outrigger, the work involving the raising and lowering of the frame is very complicated.

  Moreover, since the apparatus of patent document 1 fixes the rail to the base machine provided with the digging pedestal part, after press-fitting the casing tube to the ground, the field can be moved until the casing tube is removed. However, since the carriage can be moved only in the horizontal direction in this state, the suspended object can be moved only within the movable range of the carriage. For this reason, the equipment and materials used in each process of the all-casing method must be carried using different heavy equipment every time it is changed, and heavy equipment is complicated in a narrow work space. It was accompanied by.

  Further, in the above apparatus, the distance between the winch that winds the wire and the carriage changes with the movement of the carriage, so the length of the hanging wire taken out from the carriage also changes. That is, the suspended object rises when the carriage moves distally from the winch, and the suspended object descends when the carriage moves closer to the winch.

  These problems cause the suspended object to come into contact with surrounding equipment, etc., cause damage to the device, and the movement of the carriage during the work and the winding operation of the winch of the wire connecting the suspended object. Can be resolved by interlocking the However, there has been a problem that operation control for operating the carriage and winch in an interlocking manner becomes complicated.

For the above reasons, the device described in the above-mentioned patent document cannot carry large heavy machinery due to the limitation of empty heads, and construction in a narrow work space where small heavy machinery is complicated is dangerous and it is difficult to ensure safety. It was .

  Therefore, the technical problem to be solved by the present invention is to easily and safely construct a foundation pile in one stop by using a single crane device from erection of the casing to extraction of the casing after placing the concrete. It is to provide the construction method of the foundation pile by the all casing construction method which makes it possible.

  The present invention provides the following foundation pile construction method in order to solve the above technical problems.

According to the foundation pile building method of the present invention, a boom in which a wire having a connection fitting for connecting a suspended object is extended from the tip is attached to a base machine so that it can extend and contract in a substantially horizontal direction, and the boom is moved around a vertical axis. A method of constructing a foundation pile using a crane device configured to be pivotable,
Moving the casing tube suspended by the crane device to a predetermined position, and pressing the casing tube into the ground at the position;
Drilling the inside of the casing tube pressed into the ground by an excavator suspended by the crane device;
Suspending a reinforcing steel basket in the crane device and building it in the drilling hole by operating the base machine;
Characterized in that it comprises a step of moving from the predetermined position by the operation of the base machine suspended by the casing tube being pulled along with the pouring of the concrete to be Da設inside the drilling said crane unit And

In the present invention, wherein the step of drilling is a soil discharge excavated by the excavator, lifting the drilling outside by pulling of the excavator, disposal outside of the boring by the swing and telescopic said boom can do.

Furthermore, the boom is
A first arm having a first wire sheave near the tip;
A second arm provided so as to be movable back and forth along the first arm and having a second wire sheave in the vicinity of the tip;
A slider movably provided along the first arm;
Meshing means provided on the slider and the first and second arms and meshing with each other to extend and retract the second arm with movement of the slider;
An intermediate wire sheave provided on the slider;
Driving means for moving the slider;
The wire used is wound around the intermediate wire sheave midway between the first wire sheave and the second wire sheave.

The boom is
A detection member disposed at a position along the wire on the lower side of the tip of the boom, and detection means for detecting that the connection fitting is in contact with the detection member,
When the detection means detects that the connection fitting is in contact with the detection member, the winding speed of the wire can be reduced.

  According to the present invention, a boom provided in a telescopic manner is arranged in a substantially horizontal direction, and a base machine mounted so as to be able to swivel around a vertical axis is used to press fit a casing tube, excavate, embed a rebar cage, concrete Since each process of pulling out the casing tube involved in casting is performed by one device, it is not necessary to suspend the parts and devices used in each process from a high place, and it is possible to omit the labor of replacing the devices.

  Therefore, it is easy to operate suspended objects in a low-headed and narrow space, and it is easy to change the equipment and materials used in each process of the all-casing method by moving the base machine and boom. A crane device can be used in the process.

  In addition, the boom includes a first arm and a second arm, and a boom that expands and contracts the arm by sliding a slider that includes meshing means that mesh with each other is used. Further, since the wire is wound so as to be taken out from the second arm through the intermediate wire sheave provided on the slider from the first wire sheave provided at the tip of the first arm, the first wire sheave and the intermediate wire sheave of the slider are respectively connected to the first wire sheave. The length of the wire up to the wire sheave and the second arm extraction position does not change. That is, when the slider approaches the first wire sheave, the distance between the intermediate wire sheave and the second arm take-out position increases, so that both cancel each other.

Therefore, the suspended object does not move up and down with the expansion and contraction of the arm. According to this configuration, it is possible to prevent the vertical movement of the hanging object due to the expansion and contraction of the arm during the operation of putting the hanging object in and out of the slight gap between the press fit machine of the casing tube and the space upper surface. In addition, it is possible to reduce the labor of construction in a narrow work space.

  Moreover, a crane apparatus can make replacement of a suspending apparatus, components, etc. easy by moving / swinging in combination with expansion and contraction of a boom in each process of creation of a foundation pile. Therefore, it is not necessary to use a plurality of small heavy machinery or the like, and the creation of the foundation pile can be easily and safely performed in one stop by using one crane device.

It is a side view showing the composition of the crane apparatus used in the creation method of the foundation pile concerning a 1st embodiment of the present invention. It is a top view which shows the structure of the crane apparatus of FIG. It is a front view of the telescopic boom of FIG. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is sectional drawing equivalent to FIG. 4 of the telescopic boom in the extended state. It is a flowchart which shows the process of foundation pile construction by an all casing construction method. It is a side view which shows typically the operation state of the erection process of a casing tube. It is a side view which shows typically the operation state of an excavation and earth removal process. It is a top view which shows typically the operation state of an excavation / earth removal process. It is a side view which shows the structure of the crane apparatus using the telescopic boom which concerns on 2nd Embodiment of this invention. It is sectional drawing in the XII-XII line of FIG. It is a front view which shows the structure of a reduction gear mechanism typically. It is a side view showing composition of a reduction gear mechanism typically. It is operation | movement explanatory drawing of the deceleration mechanism of FIG. It is operation | movement explanatory drawing of the deceleration mechanism in the state following FIG. It is operation | movement explanatory drawing of the deceleration mechanism in the state of a continuation of FIG. It is a side view which shows typically the structure of the crane apparatus concerning the modification of this invention.

  Hereinafter, a crane apparatus used in a method of creating a foundation pile according to an embodiment of the present invention will be described with reference to the drawings. The crane apparatus 1 is equipped with a telescopic boom 10 and connects suspended objects to the connection fittings 15L and 15R. As a connection thing, each apparatus used in each process of an all casing construction method, for example, hydrograb 36 (refer to Drawing 9) etc., can be connected.

  FIG. 1 is a side view showing a configuration of a crane apparatus using a telescopic boom according to a first embodiment of the present invention. FIG. 2 is a plan view showing the configuration of the crane apparatus of FIG. FIG. 3 is a front view of the telescopic boom of FIG. A low skyhead crane apparatus (hereinafter referred to as a crane apparatus) 1 according to the present embodiment has a configuration in which a telescopic boom 10 is installed via a frame 4 on a pedestal portion 3 provided in a base machine 2 capable of traveling. It is. In addition, in FIGS. 1-6, description of the suspended | suspended object connected with the connection metal fittings 15L and 15R is abbreviate | omitted.

  The base machine 2 can use a heavy machinery vehicle for construction work. A frame 4 is placed on the upper surface of the pedestal portion 3 that is configured to be rotatable about a vertical axis with respect to the wheel portion W of the base machine 2. The pedestal unit 3 is provided with the operation unit 5 of the heavy machine vehicle, and operates the base machine 2 and a telescopic boom 10 described later.

  The frame 4 is disposed on the pedestal portion 3, and is configured to be vertically movable with respect to the support frame 4 a and the support frame provided on the pedestal portion 3 in the vertical direction, and supports the telescopic boom 10. And a frame 4b. The support frame 4a and the support frame 4b are connected by two links 4c, and these form a well-shaped link. A hydraulic cylinder 4d starting from the pedestal 3 is connected to the support frame 4b, and the support frame 4b is driven in the vertical direction in parallel with the support frame 4a by expansion and contraction thereof.

  The crane apparatus 1 according to the present embodiment can be used in a building such as a warehouse or a garage where the work space in the sky is limited, or in a tunnel or under an overhead. For this reason, in the state which raised the support frame 4b to the maximum, the height H from the ground surface of the telescopic boom 10 mounted in the base machine 2 is set within 5 m at the maximum.

  The telescopic boom 10 includes a first arm 11 connected to the support frame 4b and a second arm 12 that slides along the first arm 11 so as to be able to advance and retreat. As a result, the telescopic boom is configured to be extensible and contractible in a substantially horizontal direction, and the base material portion 3 pivots about the vertical axis with respect to the wheel portion W, whereby any desired horizontal surface can be obtained in the telescopic boom expansion and contraction range. The suspended object can be moved to the position.

  The telescopic boom 10 has two lines of wires WL and WR so that two suspended objects can be suspended, and connection fittings 15L and 15R are provided at the ends of the respective wires. Further, on both side surfaces of the telescopic boom 10, hose reels 13 for winding cables such as hydraulic hoses for operating suspended items attached to the respective connection fittings 15L, 15R are provided, and A hose sheave 14 for guiding cables to a suspended object is provided at the tip of the two arms 12, but these descriptions may be omitted in the following drawings.

  The first arm 11 is horizontally supported by being connected to the support frame 4 b at an intermediate portion. The first arm 11 has a substantially U-shaped cross section, and a pair of left and right first wire sheaves 16L and 16R are provided at the lower end of the tip, and left and right wire winches 17L and 17R are provided at the lower end of the rear end.

  The left and right wire winches 17L and 17R wind the respective wires WL and WR for suspending the suspended object around the reel, and drive them independently to feed and rewind the wires WL and WR.

  The first wire sheaves 16 </ b> L and 16 </ b> R are fixed to the distal end side of the first arm 11 via the attachment member 18. A pair of left and right load cells 19 are provided between the attachment member 18 and the first wire sheaves 16L and 16R, respectively. In order to detect whether the load of the suspended article is overloaded to the telescopic boom 10, the wire Measure the tension of WL and WR.

  The central region of the first arm 11 is provided with a bottom wall 11b that protrudes downward from the other portions, and the upper surface of the bottom wall 11b has a first arm 11 as shown in FIG. A rack member 20 extending in the longitudinal direction is provided. A rack 21 is provided on the upper surface of the rack member 20.

  The second arm 12 is telescopically provided on the first arm 11. A first guide roller 22 for supporting the lower surface of the second arm 12 and guiding the sliding of the second arm 12 is provided at the tip of the first arm 11. Further, a second guide roller 24 that moves along a guide 23 provided on the inner surface 11 s of the first arm 11 is provided at the rear end of the second arm 12. The second arm 12 can move smoothly along the first arm 11 by the first guide roller 22 and the second guide roller 24, and the length of the telescopic boom 10 expands and contracts.

  A beam member 12u is provided in the rear area of the second arm 12, and a rack member 25 provided downward from the beam member 12u is provided. The rack member 25 extends in the longitudinal direction of the second arm 12 and is provided to face the rack member 20 of the first arm 11. A rack 26 is provided on the lower surface of the rack member 25.

  The second arm 12 is provided with a slider 27. The slider 27 has a configuration in which two plate members 28 are arranged to face each other in parallel. Guide rollers 29 are provided in front and rear of the outer surface of each plate member 28 (see FIG. 2). The guide roller 29 is fitted into a guide 30 provided on the inner side surface 12 s of the second arm 12 so that the slider 27 can move smoothly along the second slider 12.

  A hydraulic cylinder 31 provided at the rear end of the first arm 11 is connected to the slider 27, and the slider 27 moves along the second slider 12 as the piston 31 p of the hydraulic cylinder 31 expands and contracts. .

  A pinion 32 is provided between the plate members 28 of the slider 27. The pinion 32 meshes with the rack 21 of the first arm and the rack 26 of the second arm. When the slider 27 is pushed out to the front end side of the first arm 11 by the extension of the hydraulic cylinder 31, the pinion 32 that meshes with the rack 21 of the first arm rotates, and the second rack 26 that meshes with the pinion 32 rotates the second. The arm 12 is pushed forward. Therefore, as a whole, the telescopic boom 10 extends the total length of the moving distance of the slider in the first arm 11 and the moving distance of the second arm 12 relative to the slider (see FIG. 6).

  On the other hand, when the slider 27 is returned to the rear end side of the first arm 11 by the reduction of the hydraulic cylinder 31, the second arm 12 is similarly engaged with the first arm 11 by the rack 26 meshed with the rotation of the pinion 32. It is returned backward to. Accordingly, the telescopic boom 10 is reduced.

  The slider 27 is provided with intermediate wire sheaves 33L and 33R, respectively. The intermediate wire sheaves 33L and 33R wind the respective wires WL and WR sent from the first wire sheaves 16L and 16R, and send them to the second wire sheaves 34L and 34R provided at the tip of the second arm 12. . That is, each of the wires WL and WR extends from the left and right wire winches 17L and 17R to the first wire sheaves 16L and 16R in the front end direction, and is wound around the first wire sheaves 16L and 16R to the intermediate wire sheaves 33L and 33R. And wound around the intermediate wire sheaves 33L and 33R and sent to the second wire sheaves 34L and 34R. Further, as described above, the connection fittings 15L and 15R are connected to the ends of the wires WL and WR.

  Therefore, when the telescopic boom 10 has a constant length, the left and right wire winches 17L and 17R are independently driven to connect to the wires WL and WR taken out from the tip of the second arm 12. The metal fittings 15L and 15R move up and down.

  At the tip of the second arm 12, limit switches 35L and 35R are provided below the second wire sheaves 34L and 34R. When the wires WL and WR are wound up, the connection fittings 15L and 15R come into contact with the limit switches 35L and 35R, and the winding upper limit positions of the connection fittings 15L and 15R are detected. An example of the detection mechanism of the limit switches 35L and 35R will be described later, but is not limited to this embodiment. The positions of the connection fittings 15L and 15R until the connection fittings 15L and 15R come into contact with the second wire sheaves 34L and 34R. The configuration is not particularly limited as long as it can detect.

  On the other hand, the case where the length of the telescopic boom 10 changes while the left and right wire winches 17L and 17R are not driven is examined. As shown in FIGS. 4 and 6, when the telescopic boom 10 is extended, the slider 27 is moved toward the first wire sheaves 16L and 16R by a distance corresponding to half the extension distance of the second arm 12 with respect to the first arm 11. Moving. That is, the distance between the first wire sheaves 16L and 16R and the intermediate wire sheaves 33L and 33R is shortened.

  Further, since the extension distance of the second arm 12 with respect to the first arm 11 is twice the relative movement distance of the rack 26 meshing with the pinion 32, the distance between the intermediate wire sheaves 33L and 33R and the second wire sheaves 34L and 34R is the second distance. The length is increased by a distance corresponding to half of the extension width of the arm 12.

  As a result, even if the telescopic boom 10 is extended, the distance between the first wire sheaves 16L and 16R and the intermediate wire sheaves 33L and 33R is reduced, and the distance from the intermediate wire sheaves 33L and 33R to the second wire sheaves 34L and 34R is increased. The winding length of the wires WL and WR from the first wire sheaves 16L and 16R to the second wire sheaves 34L and 34R does not change. Therefore, even if the length of the telescopic boom 10 changes, the height positions of the connecting fittings 15L and 15R do not change.

  The crane apparatus 1 according to the present embodiment equipped with the telescopic boom 10 having the above-described configuration can be suitably used for foundation pile creation work using an all casing method in a low-headed and narrow site.

  For example, public transport infrastructure such as railways built nationwide has been aging structurally over time, and reinforcement and repair of its structural strength is required. In addition, there is a background that the demand for earthquake resistance of public transport infrastructure built under the old earthquake-resistant design standards is increasing rapidly in preparation for a large earthquake that is expected in the future. In particular, it is necessary to construct foundation piles in an environment where there is a high demand and importance for reinforcement and seismic retrofitting of existing viaducts, and where there are low heads and existing support legs under the existing viaducts. is there.

As shown in FIG. 7, it is necessary to perform six steps to create a high-quality foundation pile. That is, the digging position is determined, the casing tube is suspended by a crane, and is erected in the ground by a press machine (# 1). Casing tube, and are both combined predetermined lengths and like an anchor multiple ones Hajaku, Tatekomu to the desired depth. Next, excavation and earth removal are repeated until the desired depth is reached with a hydrograb inside the casing tube, and a hole for placing a pile is drilled (# 2). Next, when a slime is generated in which water and drilling waste mixed in the hole at the time of drilling are mixed, the slime is removed by sucking up the slime with a pump (# 3). If a pile is driven in a state where the slime remains, the pile will stand on the slime between the pile and the ground, and sufficient support force cannot be exhibited.

  Furthermore, the rebar cage suspended by the crane is lowered and built in the drilling hole (# 4). As the reinforcing bar basket, one having a predetermined height dimension is used, and a plurality of reinforcing bar baskets are used in combination in accordance with the depth of drilling. Next, the concrete is placed between the tremi into which the concrete is poured to form a pile (# 5). With the progress of concrete placing, the casing tube is pulled out by a crane, and after the concrete placing is completed, all the casing tubes are pulled out and removed (# 6).

  Since these processes use different heavy machinery, it is virtually impossible to suspend all heavy machinery with a large crane. Moreover, since it is necessary to hold down a casing tube by a press-fit machine in all processes from construction to extraction of a casing tube, a press-fit machine will be arranged around a perforation. For this reason, predetermined equipment is also arranged around the drilling hole, and work such as replacement of heavy machinery at the time of switching the process becomes complicated.

  That is, carrying out these steps in a narrow and low-blank work space results in the construction site being complicated by using a plurality of small heavy machines because large heavy machines can not be brought in due to the limitation of empty heads, and construction efficiency is reduced. Deteriorating, leading to longer construction periods and increased costs. In addition, construction in a narrow work space where heavy machinery is complicated is dangerous and it is difficult to ensure safety.

  The crane apparatus according to the present embodiment solves the above problems in the foundation pile creation process, and enables the foundation pile to be created easily and safely in one stop.

  FIG. 8 is a side view schematically showing an operation state of the process of constructing the casing. In the casing tube erection step (# 1), a press-fitting machine 81 for pushing the casing tube 80 is installed in advance at the excavation site. Then, the casing tube 80 is suspended as a suspended object on the connection fittings 15L and 15R of the crane apparatus 1, and the casing tube 80 is moved above the press-fitting machine by moving the crane apparatus or adjusting the length of the telescopic boom 10. It is lowered afterward and inserted into the press-fitting machine 81. The press-fit machine 81 builds on the ground while rotating the casing tube in the axial direction. The casing tubes are connected and adjusted in length, and the operation of connecting the casing tubes to a target depth is repeated.

  9 and 10 are diagrams schematically showing an operation state of the excavation / soil removal step (# 2). In the excavation and earth removal process, the hydrograb 36 is connected as a suspended object to the connecting brackets 15L and 15R of the crane apparatus. The crane apparatus 1 according to the present embodiment can vertically and horizontally move the hydro grab 36 without changing the height of the entire apparatus by adopting a configuration in which the telescopic boom 10 is supported in the horizontal direction. . That is, as described above, the hydrograb 36 is moved up and down by winding the wires WL and WR, and the telescopic boom is extended and contracted (arrow 90) and held substantially horizontally on the ground as shown in FIGS. The hydrograb 36 is moved to the periphery including the position immediately above the casing tube 80 by the pivoting of the pedestal 3 (arrow 91). In these cases, the hydrograb 36 does not move up and down even when the telescopic boom 10 is expanded and contracted. Therefore, in the case of using suitably in a building such as a warehouse or garage with limited working space in the sky or in a tunnel, etc., the vertical control of the hydro grab 36 can be performed only by the left and right wire winches 17L and 17R. Hydrograb position control is easy.

  The hydro grab 36 is suspended in the casing tube 80 by the telescopic boom 10, grabs the soil in the casing tube 80 by closing the shell at the bottom of the excavation hole, and then moves out of the tube and discharges it out of the tube.

  In the slime treatment process (# 3), a slime treatment device for discharging slime in the excavation hole is connected as a suspended object to the connecting brackets 15L and 15R of the crane device, and the suction part is lowered to the inside of the drilling hole. The slime inside the drilling hole is discharged to the outside. The suction part of the slime treatment device has a built-in pump, which is used by being suspended at a depth where the slime exists.

  In the reinforcing bar cage building step (# 4), a holder for hanging the reinforcing bar basket as a suspended object is connected to the connecting brackets 15L and 15R of the crane device, and the reinforcing bar basket is inserted into the drilling hole.

  In the concrete placing step (# 5) and the casing tube drawing step (# 6), a holding tool for suspending the tremi tube and the casing tube for placing concrete on the connecting brackets 15L and 15R of the crane device, respectively. Connect, and pull out the casing tube with a crane as the concrete placement progresses. In these steps, the toremi pipe is inserted into the borehole, concrete is poured from the lower side, and the casing tube of the portion into which the concrete is poured by the press-in machine is pulled out. The withdrawn casing tube is disconnected, suspended by a crane device and moved to a predetermined position.

  Thus, according to the crane apparatus concerning this embodiment, all processes are attained by exchanging a suspended object, without using a dedicated apparatus in each process. Further, even when the telescopic boom is extended and contracted, the connection fittings 15L and 15R do not move up and down, so that the work in each process becomes easy.

Second Embodiment
FIG. 11 is a side view showing a configuration of a crane apparatus using a telescopic boom according to the second embodiment of the present invention. 12 is a cross-sectional view taken along line XII-XII of FIG. A low-headed crane apparatus (hereinafter referred to as a crane apparatus) 40 according to the present embodiment has a configuration in which a telescopic boom 41 is installed via a frame 42 on a pedestal 3 provided in a base machine 2 capable of traveling. It is. Since the crane apparatus 40 concerning this embodiment has a part common with the crane apparatus 1 concerning 1st Embodiment, description is abbreviate | omitted about the said common part and description is advanced centering on difference.

  A heavy machine vehicle for construction work is used as the base machine 2, and the configuration of a frame 42 that connects the telescopic boom 41 and the base machine 2 is different. The frame 42 is disposed on the pedestal portion 3, and is configured to be vertically movable with respect to the support frame 42 a and the support frame 42 a provided vertically on the pedestal portion 3, and supports the telescopic boom 41. And a support frame 42b. The support frame 42a and the support frame 42b are connected by two links 42c, and these form a well-shaped link. A hydraulic cylinder 42d starting from the pedestal 3 is connected to the support frame 42b, and the support frame 42b is driven in the vertical direction in parallel to the support frame 42a by expansion and contraction thereof.

  At the upper end of the support frame 42b, a horizontal frame 42e provided in a substantially horizontal direction is provided. The horizontal frame 42e is configured to be able to measure the moment of the load applied to the telescopic boom 41 while being connected to the first arm 43.

  The first arm 43 is provided with a front leg portion 45f and a rear leg portion 45r that are configured as a pair of left and right. The rear leg 45r is pivotally mounted about the horizontal frame 42e and the rotary shaft 46. The front leg 45f is provided with a guide 45a at its lower end, and is inserted into the horizontal frame 42e so that it can move up and down as a whole when the telescopic boom 41 pivots about the rotary shaft 46. There is.

  A connecting plate 47 is provided below the front leg portion 45 f, and the connecting plate 47 is connected to the load cell 48. The load cell 48 can measure the moment applied to the telescopic boom 41 by measuring the load applied to the front leg portion 45f, and the moment that changes with expansion and contraction of the telescopic boom 41 and the load due to the suspended object are excessive for the telescopic boom 41. It is used to detect whether it becomes a load and to keep the base machine 2 in a stable state.

  A rack support beam 49 is provided on the front leg 45f and the rear leg 45r, and the rack support beam 49 includes a bar-shaped rack member 20a extending along the first arm 43 below the first arm 43. Is provided. A rack 21 is provided on the top surface of the rack member 20a.

  In order to support the second arm 44 provided in a nested manner in the first arm 43, the tip of the first arm 43 supports the lower surface of the second arm 44 and guides the sliding of the second arm 44. A first guide roller 22 is provided for this purpose.

  A beam member 44u is provided in the rear region of the second arm 44, and a rack member 25a provided downward from the beam member 44u is provided. The rack member 25 a extends in the longitudinal direction of the second arm 44 and is provided to face the rack member 20 of the first arm 43. A rack 26 is provided on the lower surface of the rack member 25a.

  The two racks 21 and 26 provided so as to face each other mesh with a pinion provided on the slider, and perform telescopic boom 41 expansion and contraction. That is, as in the first embodiment, the slider is connected to a hydraulic cylinder provided behind the first arm 43 and moves along the first arm 43 as the hydraulic cylinder expands and contracts. When the slider moves, the second arm 44 is expanded and contracted by the pinion provided on the slider, and the telescopic boom 41 is expanded and contracted.

  Further, as in the first embodiment, the sliders are each provided with an intermediate wire sheave. The intermediate wire sheave is wound around the wires WL and WR sent from the first wire sheaves 16L and 16R and sent to the side of the second wire sheaves 34L and 34R provided at the tip of the second arm 44. That is, each of the wires WL and WR extends from the left and right wire winches 17L and 17R to the first wire sheaves 16L and 16R in the front end direction, and is wound around the first wire sheaves 16L and 16R to the intermediate wire sheaves 33L and 33R. Is further wound around the intermediate wire sheave and sent to the second wire sheaves 34L and 34R. Further, as described above, the connection fittings 15L and 15R are connected to the ends of the wires WL and WR.

  As a result, even if the telescopic boom 41 is extended, the distance between the first wire sheaves 16L, 16R and the intermediate wire sheaves 33L, 33R is reduced, and the distance from the intermediate wire sheaves 33L, 33R to the second wire sheaves 34L, 34R is increased. The winding length of the wires WL and WR from the first wire sheaves 16L and 16R to the second wire sheaves 34L and 34R does not change. Accordingly, in the telescopic boom 41 according to the present embodiment, the height positions of the connection fittings 15L and 15R do not change even if the length of the telescopic boom 41 changes, as in the telescopic boom 10 according to the first embodiment.

  In the telescopic boom 41 according to the present embodiment, the second wire sheaves 34L and 34R provided at the tip of the second arm 44 are provided with a speed reduction mechanism at the time of winding the wire. In the reduction mechanism, when the wire wound at a high speed of 40 m / min or more is wound and approaches the second wire sheaves 34L and 34R, the connecting fittings 15L and 15R collide with the tip of the second arm 44 at a high speed. This is to prevent the second arm from being damaged or the boom tip from coming into contact with an upper structure (such as a roof or a lower surface of a viaduct) due to a reaction reaction.

  FIG. 13 is a front view showing the configuration of the speed reduction mechanism. FIG. 14 is a side view schematically showing the configuration of the speed reduction mechanism. 13 and 14 show a speed reduction mechanism for the right wire WR, and the left wire WL has a similar configuration in a bilaterally symmetrical manner.

  The speed reduction mechanism used in the crane device of the present embodiment is provided with an unbalance wheel 50R provided coaxially with the rotation shaft 34a of the second wire sheaves 34L, 34R. The unbalance wheel 50R is provided in a state of being close to and parallel to the second wire sheave 34R, and is disposed between the left and right second wire sheaves 34L and 34R in the present embodiment.

  A weight wire 52R having a tip connected to the detection weight 51R is wound around the unbalance wheel 50R. The detection weight 51R corresponds to an example of the detection member of the present invention, is configured in a cylindrical shape, and a wire WR is loosely fitted in the lumen.

  The unbalance wheel 50R is partially provided with a thin portion 53R in order to be configured with a partially different weight balance in the circumferential direction. In the state where no external force is applied, the unbalance wheel 50R and the detection weight 51R, as shown in FIGS. 13 and 14, the weight wire 52R is extended to the maximum by the weight of the detection weight 51R, and the thin portion 53R portion Is designed to be located below.

  Further, a deceleration detection piece 54R is provided on the periphery of the unbalanced wheel 50R, and a deceleration sensor 55R for detecting the deceleration detection piece 54R is provided in proximity to the unbalanced wheel 50R. The deceleration sensor 55R corresponds to an example of the detection means of the present invention. As shown in FIGS. 13 and 14, when the unbalance wheel 50R is in a state in which the weight wire 52R is extended, the deceleration sensor 55R detects the deceleration. The piece 54R is provided at a detectable position.

  As shown in FIG. 16, the limit switch 35R is connected to a link 56R, and a stop detection piece 57R provided at the tip of the link is configured to be detachable from the stop sensor 58R.

  Next, the detection operation of the deceleration control performed by the deceleration mechanism will be described. As shown in FIGS. 13 and 14, when the connection fittings 15L and 15R are lowered, the detection weight 51R is lowered to the maximum and the deceleration sensor 55R is not supported by the connection fitting 15R as described above. The deceleration detection piece 54R is detected. It should be noted that the feeding length of the weight wire 52R needs to be less than or equal to the entire circumference of the unbalance wheel 50R, and is preferably about 1 m at the maximum although it depends on the size of the unbalance wheel 50R.

  In a state where the deceleration sensor 55R detects the deceleration detection piece 54R (see FIG. 14), the wire winch 17R winds up the wire based on a signal from the operation unit 5 of the vehicle without performing deceleration control.

  As shown in FIG. 15, when the connection fitting 15R ascends and contacts the detection weight 51R as shown by the arrow 92 by winding the wire WR, the connection fitting 15R is pushed up from below (see arrow 93), unbalance The wheel 50R is pivoted to the right in the figure so that the thin portion 53R, which is a lightweight portion, is on the top (see arrow 94). As a result, the deceleration sensor 55R does not detect the deceleration detection piece 54R. When the signal from the deceleration sensor 55R is received, the wire winch 17R performs deceleration control, decelerates to a preset winding speed, and winds the wire WR.

  In this state, as shown in FIG. 16, the stop detection piece 57R is close to the stop sensor 58R, and when the detection signal of the stop detection piece 57R from the stop sensor 58R continues, the wire winch 17R is slow. Continue winding. Further, when limit switch 35R is pushed upward as shown by arrow 95 as shown in FIG. 17 by winding of wire WR, the direction in which stop detection piece 57R separates from stop sensor 58R via link 56R (arrow 96) and the stop sensor 58R detects the operation. When the stop sensor 58R detects the movement of the stop detection piece 57R, the wire winch 17R that has received the signal stops the winding operation.

  As described above, the crane device according to the present embodiment is equipped with the speed reduction mechanism, so that the high-speed winding of the wires WL and WR can be achieved even in a low-headed crane device in which the tip of the boom is short from the upper end of the casing tube 80. to enable. Further, since the connection fittings 15L and 15R do not move up and down as the telescopic boom 10 expands and contracts, the positions of the connection fittings 15L and 15R are detected at positions farther from the second wire sheaves 34L and 34R located at the tip of the boom. Also, false detection of the stop of the winding operation is reduced.

  As explained above, according to the crane apparatus concerning this embodiment, the crane operation | work with a low head can be made easy by employ | adopting the structure of said telescopic booms 10 and 41. FIG. That is, according to the telescopic booms 10 and 41, the first arm and the second arm which are provided to be extendable and retracted, and a slider provided with meshing means that mesh with each other is slid to extend and contract the arm. The wire is wound so as to be taken out of the second arm from the first wire sheave provided at the tip of the first arm via the intermediate wire sheave provided at the slider, so that the intermediate wire sheave of the slider and the first wire sheave are each And the length of the wire to the taking-out position of the 2nd arm hardly changes. Therefore, the suspended object hardly moves up and down with the expansion and contraction of the arm. Therefore, the operation of the suspended object in a low space and narrow space can be facilitated, and the equipment and materials used in each process of the all-casing construction method can be changed to use the crane apparatus in each process. it can.

  The present invention is not limited to the above embodiment, and can be practiced in various other aspects. For example, the boom used in the crane apparatus according to the present embodiment is not limited to those described in FIG. 2 to FIG. 4, and as shown in FIG. In addition, there is no particular limitation on the support frame configuration that attaches the boom to the base machine so that it can extend and contract in a substantially horizontal direction. Even in this case, it is preferable to use a telescopic boom that does not cause vertical movement of the suspended object due to expansion and contraction. However, the present invention is not limited to this.

  Also, the drive mechanism of the rack and pinion with the slider used to extend and retract the first arm and the second arm can extend and retract the second arm by the mechanism provided on the slider by moving the slider to the first arm As long as it is comprised, the attachment position and structure of each member are not specifically limited.

  Although the hydraulic cylinder connecting the rear end of the first arm and the slider is used to drive the slider, the present invention is not limited to this configuration, and the slider can be moved along the first arm It may be a drive mechanism.

DESCRIPTION OF SYMBOLS 1,40 Crane apparatus 2 Base machine 3 Base part 4, 42 Frame 4a, 42a Post frame 4b, 42b Support frame 4c, 42c Link 4d, 42d Hydraulic cylinder 5 Operation part 10, 41 Telescopic boom 11, 43 First arm 12, 44 Second arm 13 Hose reel 14 Hose sheaves 15L, 15R Connecting brackets 16L, 16R First wire sheaves 17L, 17R Left and right wire winches 18 Mounting members 19, 48 Load cells 20, 20a, 25, 25a Rack members 21, 26 Rack 22 First guide Rollers 23, 30 Guide 24 Second guide roller 27 Slider 28 Plate member 29 Guide roller 31 Hydraulic cylinder 32 Pinion 33L, 33R Intermediate wire sheaves 34L, 34R Second wire sheaves 35L, 35R Limit switch 36 Hydrograb 42e Horizontal frame 45a Guide 45f Front leg 45r Rear leg 46 Rotating shaft 47 Connecting plate 49 Rack support beam 50R Unbalance wheel 51R Detection weight 52R Weight wire 53R Thin part 54R Deceleration detection piece 55R Deceleration sensor 56R Link 57R Stop detection Piece 58R Stop sensor 80 Casing tube 81 Press-in machine

Claims (5)

Using a crane device that is configured to attach a boom having a connecting bracket for connecting a suspended object from the tip thereof to a base machine so that the boom can be extended and contracted in a substantially horizontal direction, and the boom can be turned around a vertical axis. A method of creating foundation piles,
Moving the casing tube suspended by the crane device to a predetermined position, and pressing the casing tube into the ground at the position;
Drilling the inside of the casing tube pressed into the ground by an excavator suspended by the crane device;
Suspending a reinforcing steel basket in the crane device and building it in the drilling hole by operating the base machine;
Characterized in that it comprises a step of moving from the predetermined position by the operation of the base machine suspended by the casing tube being pulled along with the pouring of the concrete to be Da設inside the drilling said crane unit How to create foundation piles. Wherein the step of drilling is characterized in that said soil discharge excavated by the excavator, lifting the drilling outside by pulling of the excavator, is discarded to the outside of the boring by the swing and telescopic said boom The method of creating a foundation pile according to claim 1.   The method for creating a foundation pile according to claim 1 or 2, wherein the boom is configured such that the connection fitting provided on the wire drawn from the tip does not move up and down along with the expansion and contraction. The boom is
A first arm having a first wire sheave near the tip;
A second arm provided so as to be movable back and forth along the first arm and having a second wire sheave in the vicinity of the tip;
A slider movably provided along the first arm;
Meshing means provided on the slider and the first and second arms and meshing with each other to extend and retract the second arm with movement of the slider;
An intermediate wire sheave provided on the slider;
Driving means for moving the slider;
The foundation wire creation method according to claim 3, wherein the wire is wound around the intermediate wire sheave in the middle of the first wire sheave and the second wire sheave. The boom is
A detection member disposed at a position along the wire below the tip end of the boom, and detection means for detecting that the connection fitting has come into contact with the detection member;
The foundation pile creation method according to any one of claims 1 to 4, wherein when the detection means detects that the connection fitting comes into contact with the detection member, the winding speed of the wire is reduced. .

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