Self-propelled reaction frame and construction method

Abstract

To provide a self-propelled reaction force frame that can be suitably installed and removed without using temporary piles or the like and can efficiently perform press-fitting work.SOLUTION: A self-propelled reaction force frame that receives the reaction force when a pile is press-fitted into the ground with a pile press-fitting / pulling machine comprises: a frame portion having a fixing portion for fixing the pile press-fitting / pulling machine; and a crawler provided integrally with the frame portion via a crawler frame. The frame portion and the crawler frame can be integrally self-propelled by driving the crawler. Further, the pile press-fitting / pulling operation can be performed by the pile press-fitting / pulling machine with the frame portion, the crawler frame, and the crawler integrally connected.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a self-propelled reaction frame used in the pile jacking method. And construction method It relates to.

Background Art

[0002] As a method of driving and embedding various piles (jacked piles) such as steel pipes and steel sections into the ground, the upper end of an existing pile embedded in the ground in advance is grasped by a clamp to obtain reaction force, and a chuck holding the pile is lifted and lowered, so that new piles are sequentially jacked into positions adjacent to the existing pile. A construction technique is known. Also, by the same method, a construction technique is known in which the upper end of an existing pile is grasped by a clamp to obtain reaction force, and the chuck holding another existing pile is lifted to pull out and remove the pile from the ground.

[0003] The pile jacking and extraction machine used for such construction has a saddle fixed to an existing pile via a plurality of clamps, and a slide frame that can move in the front-rear direction with respect to the saddle. A mast rotatably mounted on the slide frame is attached with a chuck that can be lifted and lowered. Known piles used include, for example, steel sheet piles, steel pipe sheet piles, steel pipe piles, and concrete piles. Then, the chuck is positioned at a predetermined position with respect to the saddle, and the pile to be jacked or extracted at the predetermined position is grasped by the chuck, and the chuck is lifted and lowered along the mast to jack in or extract the pile.

[0004] In the construction using such a pile jacking and extraction machine, the upper end of an existing pile that has already been jacked in is grasped by a clamp provided on the lower surface of the saddle to obtain reaction force, and the chuck holding the pile is lifted and lowered, so that new piles are sequentially jacked into positions adjacent to the existing pile. However, when initially jacking in the pile (during initial jacking), since there is no pile for taking reaction force yet, a reaction frame has conventionally been used.

[0005] For example, Patent Document 1 discloses a technique in which a reaction frame is pressed against the ground using a self-propelled device at the time of initial jacking or the like to obtain a reaction force and the initial steel pile is jacked in. Further, Patent Document 2 discloses a steel pipe pile jacking device equipped with a grounding self-propelled means for pile driving work under an elevated structure or the like. According to the techniques disclosed in such Patent Documents 1 and 2, it is possible to achieve improvements in efficiency such as shortening of the construction time and stable construction in a narrow construction site.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in the technique described in the above Patent Document 1, in a device in which the self-propelled device, the reaction frame, and the pile jacking / pulling machine are separately configured, at the time of initial jacking in pile jacking / pulling construction, a method is adopted in which the reaction frame is pressed against the ground to obtain a reaction force and the first initial steel pile is jacked in. Therefore, a configuration in which the gantry part is pressed against the ground using an arm is adopted, and there are concerns about problems such as complication of the mechanism and time required for installation of the reaction frame.

[0008] In addition, in the technology described in Patent Document 2, a self-propelled means for the track is also provided in combination with the self-propelled means for grounding, and there are problems such as a complicated device configuration and an increase in cost. Further, since the device configuration is complicated, there are problems such as difficulty in construction when it is difficult to install a reaction frame at the press-in position of the initial steel pile, and problems such as time-consuming installation of the reaction frame and low construction efficiency. For example, when there are overhead obstacles at the press-in position of the initial steel pile, it is not possible to install a pile press-in / pull-out machine and a reaction frame at the press-in position of the initial steel pile. Therefore, it is necessary to install a reaction frame at a location without overhead obstacles, press in temporary piles from there, and press in the main pile (initial steel pile) to a predetermined position via these temporary piles. Patent Document 2 is a technology related to an apparatus for driving a pile, and does not disclose a technical idea of obtaining a reaction force using a reaction frame during the initial press-in of pile press-in / pull-out construction, and it cannot be said that sufficient solutions for cases where it is difficult to install a reaction frame are disclosed.

[0009] In view of the above circumstances, an object of the present invention is to provide a self-propelled reaction frame that can suitably install and remove a reaction frame without using temporary piles or the like, and can efficiently perform a press-in operation. And construction method is to provide.

Means for Solving the Problems

[0010] To achieve the above object, according to the present invention, there is provided a self-propelled reaction frame that receives a reaction force when a steel pipe pile is rotationally pressed into the ground by a pile press-in / pull-out machine, the self-propelled reaction frame including a frame portion having a fixing portion for fixing the pile press-in / pull-out machine, and a crawler integrally provided on the frame portion via a crawler frame, wherein the frame portion and the crawler frame are integrally self-propelled by driving the crawler, and pile press-in / pull-out construction by the pile press-in / pull-out machine is possible in a state where the frame portion, the crawler frame, and the crawler are integrally connected, The self-propelled reaction frame is provided with a reaction arm having a predetermined length extending in a rod shape protruding forward or backward of the self-propelled reaction frame. When a moment is generated for the self-propelled reaction frame fixed with the pile press / puller to rotate, the reaction arm having a predetermined length extending in a rod shape abuts against the outer peripheral surface of one or more existing piles, and by obtaining a reaction force only for the rotational moment generated with the rotational press-in of the steel pipe pile from the existing pile, it is configured to be able to prevent the self-propelled reaction frame fixed with the pile press / puller from rotating, and the tip of the reaction arm can be prevented from contacting the ground characterized in that it is configured to be movable in the vertical direction, a self-propelled reaction frame is provided.

[0011] One or more fixing holes are formed in the fixing part, and a spacer member for making the shape of the fixing hole correspond to the clamp shape of the pile jacking and pulling-out machine may be detachably provided.

[0012] In a state where the pile jacking and pulling-out machine is fixed to the gantry part, a weight member of a predetermined weight and a bracket member for attaching the weight member may be detachably provided on the chuck frame of the pile jacking and pulling-out machine.

[0013] One end of the reaction arm may be attached to the crawler frame of the self-propelled reaction frame

[0014] In a state where the pile press / puller is fixed to the gantry portion, the power source of the crawler may be configured to use the power source of the pile press / puller

[0015] Further, according to the present invention, there is provided a construction method of performing pile jacking and pulling-out construction with the pile jacking and pulling-out machine by using the self-propelled reaction frame described above. The pile jacking and pulling-out machine includes a chuck for gripping the steel pipe pile, and while gripping the steel pipe pile with the chuck and rotating it, the pile jacking and pulling-out construction of the steel pipe pile is performed by raising and lowering the chuck. In the pile jacking and pulling-out construction, the reaction arm is brought into contact with the outer peripheral surface of the existing pile. A construction method is provided, characterized in that a reaction force only for the rotational moment generated in the pile press / puller and the self-propelled reaction frame with the rotational press-in of the steel pipe pile is obtained from the existing pile

Effect of the Invention

[0016] According to the present invention, it is possible to suitably install and remove the reaction frame without using a temporary pile or the like, and it is possible to efficiently perform the jacking operation.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted. In this specification, the front of the pile press / puller indicates the side that grips the pile to be pressed in during pile pressing in the entire apparatus. For example, in the side view such as FIG. 1 below, the right side of the apparatus is taken as the front of the pile press / puller. As the pile to be pressed in, steel pipe piles, U-shaped steel sheet piles, hat-shaped steel sheet piles, concrete piles, various steel shapes, etc. can be considered, but in this embodiment, it will be described as a steel pipe pile.

[0019] (Schematic Configuration of Pile Press / Puller) FIG. 1 is a schematic side view of a pile press / puller 1 according to an embodiment of the present invention. As shown in FIG. 1, the pile press / puller 1 includes a saddle 10 that constitutes a main body (base portion), and a plurality of clamps 11 provided below the saddle 10. The clamp 11 has a function of fixing the saddle 10 by gripping an existing pile or a fixing portion set on the rear side of a reaction force base 2 described later by driving a hydraulic cylinder (not shown), and taking the reaction force of the press-in.

[0020] Further, a slide frame 12 that is slidable in the front-rear direction with respect to the saddle 10 is provided on the upper portion of the saddle 10. A mast 20 serving as a swivel base is configured to be rotatable with respect to the slide frame 12 around the central portion of the slide frame 12. The rotation of the mast 20 is performed by a rotation drive source (not shown), such as a motor, provided on, for example, the lower surface side of the mast 20.

[0021] A chuck frame 25 and a chuck 26 are arranged in front of the mast 20. The slide frame 12 serves as the base portion of the mast 20. When the slide frame 12 moves in the front-rear direction on the upper surface of the saddle 10, the mast 20, the chuck frame 25, and the chuck 26 move integrally in the front-rear direction. Further, the chuck frame 25 and the chuck 26 move up and down integrally by the telescopic operation of the main cylinder 30. The chuck 26 is configured to be rotatable on the lower surface of the chuck frame 25.

[0022] The chuck 26 is provided with an opening (not shown) for inserting the steel pipe pile U in the vertical direction and chuck jaws (not shown) for gripping the steel pipe pile U passed through the opening. The chuck jaws are composed of a movable jaw and a fixed jaw, and the movable jaw and the fixed jaw are configured to be able to approach and separate from each other when the movable jaw is driven by a cylinder (not shown). Using the chuck 26 having such a configuration, the steel pipe pile U is gripped and released during press-fitting or the like. The pile press-fitting and pulling-out machine 1 according to the embodiment of the present invention is configured as a so-called rotary press-fitting type pile press-fitting and pulling-out machine that rotates the steel pipe pile U while gripping it with the chuck 26 and raises and lowers the chuck 26 by the operation of the main cylinder 30 in that state to perform the press-fitting of the steel pipe pile U.

[0023] (Schematic configuration of the reaction frame) FIG. 2 is a schematic view of the reaction frame 2 according to the embodiment of the present invention, where (a) is a schematic side view and (b) is a schematic plan view. As shown in FIG. 2, the reaction frame 2 includes a frame portion 40 constituting the main body, crawler frames 42 on both side surfaces of the frame portion 40, and crawlers 45 for traveling fixed to the frame portion 40 via the crawler frames 42. As shown in FIG. 2(b), between the frame portion 40 and the crawler frame 42, the connection ends of the crawler frame 42 are sandwiched with respect to the connection portions 46 located on the four sides of the frame portion 40 in a plan view, and fixation is performed using a fixing mechanism 47 such as a cylinder. Further, the crawler frame 42 is formed with protruding portions 42a protruding in both side directions of the reaction frame 2, and the crawler frame 42 and the crawler 45 are fixed by inserting and fixing the protruding portions 42a into predetermined positions of the crawler 45. That is, the frame portion 40, the crawler frame 42, and the crawler 45 are detachable from each other, and when all members are fixed, the reaction frame 2 is integrally configured to be substantially U-shaped in a plan view. Here, regarding the configuration of the reaction frame 2, the fact that the frame portion 40, the crawler frame 42, and the crawler 45 are "integrally" configured does not necessarily mean that each member is always integrally configured. For example, during the travel of the device, each member is connected by the function of the fixing mechanism 47, and it also includes the concept that each member is in a removed state when the device is not in use (for example, during transportation).

[0024] A power relay portion 48 that conducts to a traveling drive mechanism (not shown) such as a motor of the crawler 45 is installed in the frame portion 40, and a connection line 49 connected to a power source is provided in the power relay portion 48. In the center of the frame portion 40, a fixing portion 50 for gripping the clamp 11 of the pile jacking / pulling machine 1 is configured. The configuration of the fixing portion 50 can be arbitrarily designed according to the shape and configuration of the clamp 11. In the form of FIG. 2, the fixing portion 50 is configured with two circular fixing holes 52 (52a, 52b).

[0025] The pedestal part 40 is preferably made of metal with a predetermined weight or more, and in combination with the weights of the crawler frame 42 and the crawlers 45, it is preferable that the total weight of the reaction pedestal 2 is configured to be a predetermined weight or more. The total weight of the reaction pedestal 2 is preferably designed based on the relationship between the total weight of the apparatus when connected to the pile press / puller 1 and the required reaction force determined based on the type of the ground to be pressed and the piles to be pressed (i.e., construction conditions).

[0026] (Connection structure between the pile press / puller and the reaction pedestal) As described above with reference to FIGS. 1 and 2, the pile press / puller 1 and the reaction pedestal 2 configured as such are connected and fixed to each other using the clamp 11 and the fixing part 50. FIG. 3 is a schematic explanatory view regarding the connection between the pile press / puller 1 and the reaction pedestal 2, where (a) is a schematic view at the time of connection, (b) is a schematic side view, and (c) is a schematic plan view. In FIG. 3, the pile press / puller 1 is illustrated by a two-dot chain line, and the reaction pedestal 2 is illustrated by a solid line.

[0027] As shown in FIG. 3(a), when connecting the pile press / puller 1 and the reaction pedestal 2, the pile press / puller 1 is lifted by a general crane R, and the pile press / puller 1 is lowered to a predetermined upper position of the reaction pedestal 2 arranged at a predetermined position. That is, under the airspace restriction where there are aerial obstacles or the like, it may be difficult to perform the work using the crane R.

[0028] Subsequently, as shown in FIG. 3(b), in a state where the pile press / puller 1 is installed on the upper surface of the reaction pedestal 2, a part of the plurality of clamps 11 provided on the pile press / puller 1 grips the fixing holes 52a and 52b of the pedestal part 40, thereby connecting the pile press / puller 1 and the reaction pedestal 2. In a state where the pile press / puller 1 and the reaction pedestal 2 are connected, the chuck 26 of the pile press / puller 1 is configured to be positioned in the gap part of the reaction pedestal 2 that is substantially U-shaped in plan view, and the steel pipe pile U is gripped by the chuck 26. At this time, it is preferable that the overall center of gravity position of the pile press / puller 1 and the reaction pedestal 2 is designed to be in the vicinity of the steel pipe pile U gripped by the chuck 26.

[0029] At the initial jacking-in stage of the pile jacking and extraction construction, as shown in Fig. 3, in a state where the pile jacking and extraction machine 1 is connected to the reaction frame 2, a reaction force is obtained from the self-weights of the pile jacking and extraction machine 1, the reaction frame 2, and the steel pipe pile U (see Fig. 1), and a process of jacking in the steel pipe pile U held by the chuck 26 is adopted. Further, in a state where the pile jacking and extraction machine 1 and the reaction frame 2 are connected, as shown in Fig. 3(b), due to the connection of the connection line 49 via the power relay part 48, as the power source of the crawler 45, a hydraulic source or the like (not shown) which is the power source of the pile jacking and extraction machine 1 is used, and the power source of the pile jacking and extraction machine 1 such as the main cylinder 30 and the power source of the crawler 45 may be commonly used.

[0030] (Schematic configuration of the weight member) As described with reference to Fig. 3, in a state where the pile jacking and extraction machine 1 is connected onto the reaction frame 2, a weight member 60 of a predetermined weight can be attached. Figs. 4 to 6 are schematic explanatory views of the configuration with the weight member 60 attached, Fig. 4 being a schematic side view, Fig. 5 being a schematic plan view, and Fig. 6 being a schematic front view.

[0031] As shown in Figs. 4 to 6, the weight member 60 is installed on both sides thereof via bracket members 62 so as to be close to the chuck frame 25 above the chuck 26 of the pile jacking and extraction machine 1. In the present embodiment, the weight member 60 has a configuration having left and right weights 60a and 60b.

[0032] The weight member 60 is detachable and is installed as needed, for example, when the reaction force is insufficient from the self-weights of the pile jacking / pulling machine 1, the reaction force frame 2, and the steel pipe pile U during the initial jacking of the pile jacking / pulling construction. The weight member 60 is preferably composed of a metal having a weight of a predetermined weight or more, and is designed so that the total weight with the weights of the pile jacking / pulling machine 1 and the reaction force frame 2 becomes a predetermined value or more. As an example, when the total weight of the entire apparatus required depending on the construction conditions (ground conditions, type of jacked pile, etc.) is 100 t, the weight of the gantry part 40 is 40 t, and the weight of the pile jacking / pulling machine 1 is 30 t, the weight of the weight member 60 is designed to be 30 t or more. The required weight and the magnitude of the reaction force to be obtained during the pile jacking / pulling construction vary depending on the construction conditions. When the weights of the pile jacking / pulling machine 1 and the reaction force frame 2 are determined, the weight of the entire apparatus is adjusted by appropriately adjusting the weight of the weight member 60.

[0033] In addition, in FIGS. 4 to 6, the case where the weight member 60 is installed in proximity to the chuck frame 25 via the bracket member 62 is illustrated, but the position where the weight member 60 is installed can be arbitrarily designed. For example, the weight member 60 may be provided on the gantry part 40 or the crawler frame 42. Further, in the present embodiment, the installation of the weight member 60 may be performed in a place without an overhead restriction, and a process such as self-running to the construction site (for example, the jacking position of the initial steel pile) after the installation of the weight member 60 can be adopted.

[0034] (Function and effect) As described above, according to the pile jacking / pulling machine 1 and the reaction force frame 2 according to the present embodiment described with reference to FIGS. 1 to 6, since the reaction force frame 2 is a self-propelled type provided with the crawlers 45, the reaction force frame 2 can be easily installed and removed regardless of the location of the initial jacking place of the pile jacking / pulling construction. In particular, even in a place where it was conventionally difficult to install the reaction force frame, such as when there are overhead obstacles at the jacking position of the initial steel pile (under overhead restrictions), the reaction force frame 2 can be easily installed, and the jacking operation can be efficiently performed.

[0035] In the conventional ground-mounted gantry, a method such as arranging a pile for weight on both sides of the gantry to press the gantry against the ground to obtain the jacking reaction force of the initial steel pile was adopted. At that time, an installation location for arranging the pile for weight and the like was required near the gantry, and the gantry installation area tended to be excessive. On the other hand, in the reaction gantry 2 according to the present embodiment, only the space provided with the crawlers 45 on both sides of the gantry part 40 becomes the installation area, so the entire installation area is narrowed compared to the conventional case, and it is possible to easily cope with narrow places and the like.

[0036] In addition, since the reaction gantry 2 is self-propelled, it can be operated in a state where the gantry part 40, the crawlers 45, etc. are integrated regardless of whether the pile jacking and extraction machine 1 is moving or jacking. Therefore, complicated operations such as movable adjustment and separation of the device configuration can be reduced, and work efficiency can be improved, such as being able to perform construction immediately after traveling.

[0037] In addition, under construction conditions where existing piles are already installed during pile jacking and extraction construction, the reaction gantry 2 according to the present embodiment is used, and the pile jacking and extraction machine 1 and the reaction gantry 2 are connected and self-propelled to install the pile jacking and extraction machine 1 in a form of obtaining reaction force from the existing pile and perform pile jacking and extraction construction. In addition, the construction using the reaction gantry 2 according to the present embodiment is not limited to the continuous execution of steel pipe piles or the continuous wall construction by fitting joint sheet piles, and can also be applied to the construction of single piles (jacking of only one pile) or skip pile construction with a space between piles. In particular, during skip pile construction, the distance between piles can be efficiently constructed by self-propelling in a state where the pile jacking and extraction machine 1 and the reaction gantry 2 are connected.

[0038] In addition, in this embodiment, at the initial jacking-in stage of the pile jacking and extraction construction, reaction force is obtained by the self-weight of the gantry part 40 of the reaction force gantry 2 and the weight of the weight member 60 installed as required. Therefore, operations such as jacking-in and pulling-out of temporary piles for obtaining reaction force are unnecessary, and shortening of the construction period and improvement of work efficiency can be achieved. In addition, loading of the conventional weight piles is unnecessary, and installation and removal are easier compared to the conventional ground-type reaction force gantry, so workability is improved.

[0039] In addition, the reaction force gantry 2 according to this embodiment is configured such that the power source during self-propulsion can be shared with the power source of the pile jacking and extraction machine 1. Thereby, the reaction force gantry 2 can be self-propelled without separately providing a power source or the like, and simplification of the device and cost reduction can be realized. In the reaction force gantry 2 according to this embodiment, the gantry part 40, the crawler frame 42, and the crawler 45 are integrally used during construction, but these are configured to be detachable. Therefore, when each member such as the gantry part 40, the crawler frame 42, and the crawler 45 is transported individually, for example, during non-construction, each member can be transported separately, and improvement of transportation efficiency and the like can be achieved. Particularly when using a large pile jacking and extraction machine, there is a concern that the vehicle width during transportation and the like will increase, but such problems are solved by transporting various members such as the crawler 45 separately.

[0040] As described above, an example of the embodiment of the present invention has been described, but the present invention is not limited to the illustrated form. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the idea described in the claims, and it is naturally understood that those also belong to the technical scope of the present invention.

[0041] In the above embodiment, it was described that the pile jacking and extraction machine 1 is fixed to the gantry portion 40 via the clamp 11 and the reaction gantry 2 is connected to the pile jacking and extraction machine 1. However, the connection between the pile jacking and extraction machine 1 and the reaction gantry 2 may be performed by different means. For example, in the above embodiment, with reference to FIG. 1, it was explained that the pile jacking and extraction machine 1 has a configuration including a saddle 10, a clamp 11, a slide frame 12, a mast 20, a chuck 26, etc. However, these members constituting the pile jacking and extraction machine 1 may be disassembled in some cases. In such a case, a reaction gantry equipped with crawlers may be connected to the pile jacking and extraction machine with the clamp 11 removed. As a connection method in this case, a method of providing screw holes as fixing parts on the gantry portion and fixing the saddle of the pile jacking and extraction machine to the screw holes with screws is exemplified. Further, a reaction gantry equipped with crawlers may be connected to the configuration with the lower structure (saddle 10 and clamp 11) of the pile jacking and extraction machine 1 removed. As a connection method in this case, a method of providing a groove for fitting the slide frame on the gantry portion and fitting and fixing the slide frame of the pile jacking and extraction machine to the groove is exemplified.

[0042] Also, in the above embodiment, the configuration of connecting the pile jacking and extraction machine 1 to the upper part of the reaction gantry 2 was described (see FIG. 3). However, it is also possible to connect other devices to the reaction gantry 2. For example, as a device used in pile jacking and extraction construction, a clamp crane is known, which is a device that grips a pile with a clamp, raises and lowers the pile over a wide range in the height direction, and assists the construction of the pile jacking and extraction machine 1. By connecting this clamp crane to the reaction gantry 2 and making it self-propelled, work can be carried out using the clamp crane even in cases where it is difficult to perform work with a general crane under airspace restrictions. For example, it is useful when transferring the clamp crane to an existing pile (completed pile) under airspace restrictions.

[0043] Also, various modifications can be considered for the configuration of the reaction gantry 2. Hereinafter, with reference to the drawings, a modification of the present invention regarding the reaction gantry 2 will be described.

[0044] (Modification 1) For example, in the above-described embodiment, the configuration in which the fixing holes 52a and 52b are provided at two locations of the fixing portion 50 in the reaction force pedestal 2 has been described, but the present invention is not limited thereto. Specifically, the number of fixing holes provided in the fixing portion 50 may be one or three. FIG. 7 is a schematic view showing a modification of the fixing portion 50 and is a schematic plan view of the reaction force pedestals 2a and 2b according to a modification of the present invention. Regarding each component shown in FIG. 7, some components having the same functional configuration are denoted by the same reference numerals as those in FIGS. 1 to 6 in the above-described embodiment and are shown, and the description thereof is omitted.

[0045] As shown in FIG. 7(a), for example, only one fixing hole 50c may be provided in the fixing portion 50, or as shown in FIG. 7(b), fixing holes 50d to 50f may be provided at three locations of the fixing portion 50. With such a configuration, when connecting the pile jacking / pulling machine 1 to the reaction force pedestals 2a and 2b, a plurality of types of pile jacking / pulling machines can be connected, so that the versatility of the reaction force pedestal is enhanced. For example, in view of the fact that the pedestal portion 40 and the crawler 45 are detachable, efficient construction can be performed by using pedestal portions having different configurations of the fixing portion 50 for each of a plurality of types of pile jacking / pulling machines.

[0046] (Modification 2) Also, in the above-described embodiment, nothing has been said about the diameter of the fixing hole 52 (52a, 52b) of the pedestal portion 40, but the diameter of the fixing hole 52 may be configured to be arbitrarily changed (reduced in diameter) by the spacer member 70. FIG. 8 is a schematic explanatory view according to a modification of the pedestal portion 40 of the present invention. Also in FIG. 8, some components having the same functional configuration are denoted by the same reference numerals as those in FIGS. 1 to 6 in the above-described embodiment and are shown, and the description thereof is omitted.

[0047] As shown in Fig. 8, in this modification, a cylindrical spacer member 70 is installed inside the fixing hole 52. The installation of the spacer member 70 may be carried out by any means as long as it can be fixed to the fixing hole 52. For example, it may be fixed by screwing around the fixing hole 52, threading the spacer member 70 itself, or by a locking mechanism for preventing rotation. By installing this spacer member 70, the hole diameter of the fixing hole 52 can be reduced. It is known that the clamp corresponding diameters of the pile jacking and pulling out machine for press-fitting the steel pipe pile U have various values according to the steel pipe pile diameter to be press-fitted and the like. According to this modification, by installing the spacer member 70, the diameter of the fixing hole 52 can be reduced to an arbitrary diameter, and even for reaction frames with the same gantry part 40, they can be used corresponding to various clamp corresponding diameters. That is, by commonly using the gantry part 40 constituting the reaction frame, reduction of members and the like can be achieved.

[0048] In this modification, as an example, the spacer member 70 for reducing the diameter of the fixing hole 52 has been described by taking the pile to be press-fitted as a steel pipe pile. However, even when the pile to be press-fitted is another type of pile, a spacer member having the same effect can be installed. For example, even when the clamp shape of the pile jacking and pulling out machine 1 is a clamp for hat-shaped steel sheet piles other than the clamp for steel pipe piles, it can be easily corresponded by switching the spacer member to a suitable one. That is, a suitable spacer member for making the configuration of the fixing hole 52 correspond to the clamp shape of the pile jacking and pulling out machine may be installed in the fixing hole 52 provided in the fixing part 50 of the gantry part 40.

[0049] (Modification 3) In addition to the configuration of the reaction frame 2 described in the above embodiment, when existing piles are installed in front of or behind the reaction frame 2, a reaction arm may be further provided as a reaction force means for obtaining reaction force from the existing piles. FIG. 9 is a schematic explanatory view regarding the reaction arm, and is a (a) schematic plan view and (b) schematic side view when the reaction arm 80 is provided in the reaction frame 2c according to this modification. In FIG. 9 as well, some components having the same functional configuration are shown with the same reference numerals as those in FIGS. 1 to 6 in the above embodiment, and the description thereof is omitted.

[0050] As shown in FIG. 9, in the reaction frame 2c according to this modification, in front of the crawler frame 42, a reaction arm 80 having a predetermined length protruding forward of the apparatus is provided via a connecting member such as a pin. As shown in the drawing, the reaction arm 80 is configured to be able to contact the side surface (outer peripheral surface) of the existing steel pipe pile U1. As described above, in the construction by the pile press-in / pull-out machine 1 (not shown in FIG. 9), the steel pipe pile U is rotated while being gripped by the chuck 26, and in that state, the chuck 26 is lifted and lowered by the operation of the main cylinder 30, so that the so-called rotary press-in method for performing the press-in of the steel pipe pile U is used. At that time, due to the rotational torque accompanying the rotation of the chuck 26, a rotational moment is generated for the connected pile press-in / pull-out machine 1 and the reaction frame 2c. In this modification, by providing the reaction arm 80, even when a rotational moment is generated for the connected pile press-in / pull-out machine 1 and the reaction frame 2c, by obtaining reaction force from the existing steel pipe pile U1 via the reaction arm 80, it is possible to prevent the pile press-in / pull-out machine 1 and the reaction frame 2c from rotating.

[0051] Also, due to the weight of the reaction arm 80, the weight of the entire apparatus integrally configured as the reaction frame 2c increases, and it becomes possible to take a larger reaction force during the pile press-in / pull-out construction. Furthermore, the reaction arm 80 can also be fixed to the existing steel pipe pile U1 with a pin or the like. By fixing the reaction arm 80 to the existing steel pipe pile U1, it becomes possible to more efficiently obtain the reaction force during the pile press-in / pull-out construction.

[0052] Here, the configuration of the reaction force arm 80 where it is provided at one location in front of the crawler frame 42 has been illustrated and described. However, the configuration of the reaction force arm 80 is not limited to this. For example, the reaction force arm 80 may be provided at two or more locations, or a configuration may be adopted where a plurality of reaction force arms 80 are provided at one or more locations. Thereby, more reaction force can be obtained from the reaction force arm 80. Further, the tip of the reaction force arm 80 may be configured to be movable in the vertical direction so as to prevent the tip of the reaction force arm 80 from contacting the ground during the self-propulsion of the reaction force base 2c even when there is a step on the ground or the ground is inclined.

[0053] (Modification Example 4) In addition to the configuration of the reaction force base 2 described in the above embodiment, when one or more existing piles are installed in front of or behind the reaction force base 2, a reaction force member as a reaction force means for obtaining reaction force from the one or more existing piles may be further provided. FIG. 10 is a schematic explanatory view regarding the reaction force member 90, and is a (a) schematic plan view and (b) schematic side view when the reaction force member 90 is provided in the reaction force base 2d according to this modification example. Also in FIG. 10, some components having the same functional configuration are denoted by the same reference numerals as those in FIGS. 1 to 6 in the above embodiment and are illustrated, and the description thereof is omitted.

[0054] As shown in Fig. 10, in the reaction frame 2d according to this modification, a reaction member 90 protruding forward of the apparatus is provided in front of the crawler frame 42. The reaction member 90 is composed of two extension members 91 (91a, 91b) extending forward from the crawler frames 42 on both sides of the reaction frame 2d, and gripping members 92 (92a, 92b) provided at two positions so as to span between these two extension members 91a, 91b. In this modification, when one or more existing piles (here, two existing piles U2, U3) are installed in front of the reaction frame 2d, pile jacking and extraction work is performed in a state where the existing piles are gripped by the gripping members 92 of the reaction member 90. Thereby, even when a rotational moment occurs in the pile jacking and extraction machine 1 and the reaction frame 2c connected as in the above Modification 3, by obtaining reaction force from the existing piles U2, U3, it is possible to prevent the pile jacking and extraction machine 1 and the reaction frame 2c from rotating. In addition, by configuring the reaction member 90 with a metal having a predetermined weight, the weight of the entire apparatus integrally configured with the reaction frame 2d increases, and it becomes possible to take a larger reaction force during pile jacking and extraction work.

[0055] Here, although the configuration of gripping two existing piles U2, U3 as the configuration of the reaction member 90 is illustrated and described, the configuration of the reaction member 90 is not limited to this. For example, the number of existing piles gripped by the reaction member 90 may be any number of one or more.

[0056] Further, as a reference modification of the present embodiment, for each side portion of the saddle of the pile jacking and extraction machine with the clamp removed and the slide frame with the lower structure (saddle and clamp) of the pile jacking and extraction machine removed, it is also conceivable to directly attach the crawler frame by means such as welding and screwing.

Industrial Applicability

[0057] The present invention can be applied to a self-propelled reaction frame used in the pile jacking method. And construction method It can be applied.

Explanation of Reference Numerals

[0058] 1…Hydraulic Insertion and Extraction Machine 2…Reaction Frame 10…Saddle 11…Clamp 12…Slide Frame 20…Mast 25…Chuck Frame 26…Chuck 30…Main Cylinder 40…Frame Part 42…Crawler Frame 45…Crawler 48…Power Relay Part 49…Connection Line 50…Fixing Part 52…Fixing Hole 60…Weight Member 62…Bracket Member 70…Spacer Member 80…Reaction Arm 90…Reaction Member U…Steel Pipe Pile

Claims

1. A self-propelled reaction frame for receiving reaction force when a steel pipe pile is rotationally pressed into the ground by a pile pressing / pulling machine, comprising: a frame portion having a fixing portion for fixing the pile pressing / pulling machine; a crawler integrally provided to the frame portion via a crawler frame; and the frame portion and the crawler frame are integrally self-propelled by driving of the crawler, and pile pressing / pulling construction by the pile pressing / pulling machine is possible in a state where the frame portion, the crawler frame, and the crawler are integrally connected, the self-propelled reaction frame is provided with a reaction arm having a predetermined length extending in a rod shape protruding forward or backward of the self-propelled reaction frame, when a moment for rotation of the self-propelled reaction frame with the pile pressing / pulling machine fixed occurs, the reaction arm having a predetermined length extending in a rod shape abuts against the outer peripheral surface of one or more existing piles, and by obtaining reaction force against only the rotational moment generated with the rotational pressing of the steel pipe pile from the existing pile, it is configured to be able to prevent the self-propelled reaction frame with the pile pressing / pulling machine fixed from rotating, A self-propelled reaction frame, characterized in that a tip of the reaction arm is configured to be vertically movable so as to prevent contact with the ground.

2. The self-propelled reaction frame according to claim 1, characterized in that one or more fixing holes are formed in the fixing portion, and a spacer member corresponding to the clamp shape of the pile pressing / pulling machine is detachably provided in the fixing hole.

3. The self-propelled reaction frame according to claim 1, characterized in that in a state where the pile pressing / pulling machine is fixed to the frame portion, a weight member of a predetermined weight and a bracket member for attaching the weight member are detachably provided to a chuck frame of the pile pressing / pulling machine.

4. The self-propelled reaction frame according to claim 1, characterized in that one end of the reaction arm is attached to a crawler frame of the self-propelled reaction frame.

5. The self-propelled reaction frame according to claim 1, characterized in that in a state where the pile pressing / pulling machine is fixed to the frame portion, a power source of the crawler is configured to use a power source of the pile pressing / pulling machine.

6. A construction method of performing pile pressing / pulling construction with the pile pressing / pulling machine, using the self-propelled reaction frame according to any one of claims 1 to 5, wherein the pile pressing / pulling machine includes a chuck for gripping the steel pipe pile. While gripping and rotating the steel pipe pile by the chuck, the pile driving / extracting construction of the steel pipe pile is performed by raising and lowering the chuck. In the pile driving / extracting construction, the reaction arm is brought into contact with the outer peripheral surface of the existing pile, and the reaction force against only the rotational moment generated in the pile driving / extracting machine and the self-propelled reaction gantry due to the rotational press-in of the steel pipe pile is obtained from the existing pile. A construction method characterized by this.

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