JP7684364B2 - Self-propelled reaction stand and construction method - Google Patents

Description

The present invention relates to a self-propelled reaction stand used in a pile driving method and a construction method thereof .

A known construction technique for driving and burying various types of steel pipe piles, shaped steel piles, and other piles (press-in piles) into the ground is to grip the top end of an existing pile that has already been embedded in the ground with a clamp to generate a reaction force, and then raise and lower the chuck holding the pile, thereby pressing in a new pile in sequence into a position adjacent to the existing pile. In addition, a construction technique is known in which, using a similar method, the top end of an existing pile is gripped with a clamp to generate a reaction force, and the chuck holding other existing piles is raised to pull and remove them from the ground.

The pile driving and extraction machine used in this construction has a saddle that is fixed to the existing pile via multiple clamps, and a slide frame that can move back and forth relative to the saddle, and a mast that is rotatably attached to the slide frame has a chuck that can be raised and lowered. Known piles that can be used include steel sheet piles, steel pipe sheet piles, steel pipe piles, and concrete piles. The chuck is positioned at a predetermined position relative to the saddle, and the pile to be driven in or extracted at the predetermined position is gripped by the chuck, and the chuck is raised and lowered along the mast to drive in or extract the pile.

In construction using this type of pile driving and extraction machine, the upper end of the existing pile that has already been driven in is gripped with a clamp attached to the underside of the saddle to provide a reaction force, and the chuck holding the pile is raised and lowered to drive new piles in succession in positions adjacent to the existing piles. However, when driving in a pile for the first time (initial driving in), there is no pile to provide a reaction force, so a reaction stand has traditionally been used.

For example, Patent Document 1 discloses a technology in which a self-propelled device is used to press a reaction frame against the ground surface during initial pressing, etc., to obtain a reaction force and perform initial pressing of a steel pile. Patent Document 2 discloses a steel pipe pile pressing device equipped with a self-propelled means for grounding for pile driving work under elevated roads, etc. The technologies disclosed in Patent Documents 1 and 2 can improve efficiency by shortening construction time, and can achieve stable construction in small construction sites.

Japanese Patent Application Publication No. 9-125388 Japanese Patent Application Publication No. 11-310921

However, the technology described in Patent Document 1 above is configured as a device in which the self-propelled device, reaction force base, and pile driving/pulling machine are separate, and during the initial driving of the pile driving/pulling work, the reaction force base is pressed against the ground surface to obtain a reaction force and drive in the first initial steel pile. As a result, the system uses an arm to press the base part against the ground surface, which raises concerns about problems such as the complexity of the mechanism and the time required to set up the reaction force base.

In addition, the technology described in the above Patent Document 2 is configured to provide a self-propelled means for track in addition to the self-propelled means for grounding, which causes problems such as a complicated device configuration and increased costs. In addition, because the device configuration is complicated, problems such as construction being difficult when it is difficult to install a reaction frame at the driving position of the initial steel pile, and problems such as low construction efficiency due to the time it takes to install the reaction frame. For example, if there is an obstacle in the air at the driving position of the initial steel pile, it is not possible to install a pile driving and extraction machine and a reaction frame at the driving position of the initial steel pile. Therefore, it is necessary to take a process of installing a reaction frame in a place without obstacles in the air, driving temporary piles from there, and driving the main pile (initial steel pile) into a specified position via the temporary piles. The above Patent Document 2 is a technology related to a device for driving piles, and does not disclose the technical idea of using a reaction frame to obtain a reaction force and driving in the pile during the initial driving in and out of the pile driving and extraction construction, and it cannot be said that a solution to the problem of difficult installation of a reaction frame is fully disclosed.

In view of the above circumstances, an object of the present invention is to provide a self-propelled reaction stand and construction method that enables the reaction stand to be installed and removed preferably without using temporary piles, etc., and enables pressing-in work to be carried out efficiently.

In order to achieve the above object, according to the present invention, there is provided a self-propelled reaction force stand that receives a reaction force when a steel pipe pile is rotary driven into the ground by a pile driving/pulling machine, the self-propelled reaction force stand comprising a base unit having a fixing part for fixing the pile driving/pulling machine, and a crawler that is integrally provided to the base unit via a crawler frame, the base unit and the crawler frame are capable of self-propelling as a whole by driving the crawler, and pile driving/pulling construction is possible by the pile driving/pulling machine with the base unit, the crawler frame and the crawler being integrally connected , and the self-propelled reaction force stand has a front or rear portion at the front of the self-propelled reaction force stand. a reaction arm of a predetermined length extending like a rod protruding from the top of the pile driving/pulling machine is provided, and when a moment occurs that causes the self-propelled reaction stand to rotate, the reaction arm of the predetermined length extending like a rod abuts against the outer peripheral surface of one or more existing piles, and a reaction force against only the rotational moment generated by the rotational driving of the steel pipe pile is obtained from the existing piles, thereby making it possible to prevent the self-propelled reaction stand to which the pile driving/pulling machine is fixed from rotating, and the tip of the reaction arm is configured to be freely movable in the vertical direction to prevent it from contacting the ground .

The fixing portion may be provided with one or more fixing holes, and a spacer member may be provided in a removable manner to match the shape of the fixing holes to the clamp shape of the pile driving/pulling machine.

When the pile driving/pulling machine is fixed to the mounting base, a weight member of a predetermined weight and a bracket member for mounting the weight member may be detachably provided on the chuck frame of the pile driving/pulling machine.

One end of the reaction arm may be attached to a crawler frame of the self-propelled reaction base.

The power source of the crawler may be configured to use the power source of the pile driving/pulling machine when the pile driving/pulling machine is fixed to the base portion.

Furthermore, according to the present invention, there is provided a construction method for performing pile driving-in and extraction construction with the pile driving-in and extraction machine using the self-propelled reaction stand described above, wherein the pile driving-in and extraction machine is provided with a chuck for gripping the steel pipe pile, and the steel pipe pile is rotated while being gripped by the chuck, and the pile driving-in and extraction construction of the steel pipe pile is performed by raising and lowering the chuck, and in the pile driving-in and extraction construction, the reaction arm is brought into contact with the outer peripheral surface of the existing pile, and as the steel pipe pile is rotated and driven in, a reaction force only against the rotational moment generated in the pile driving-in and extraction machine and the self-propelled reaction stand is obtained from the existing pile.

According to the present invention, it is possible to conveniently install and remove the reaction frame without using temporary piles, etc., and it is possible to carry out the pressing work efficiently.

1 is a schematic side view of a pile driving/pulling machine according to an embodiment of the present invention. FIG. 1 is a schematic diagram of a reaction force stand according to an embodiment of the present invention; FIG. 13 is a schematic explanatory diagram regarding the connection between the pile driving/pulling machine and the reaction stand. FIG. 13 is a schematic side view of a configuration in which a weight member is attached. FIG. 13 is a schematic plan view of a configuration in which a weight member is attached. FIG. 13 is a schematic front view of a configuration in which a weight member is attached. 13 is a schematic diagram showing a modified example of the fixing portion. FIG. FIG. 13 is a schematic explanatory diagram of a modified example of the pedestal portion. FIG. 4 is a schematic explanatory diagram of a reaction arm. FIG. 4 is a schematic explanatory diagram of a reaction member.

The following describes an embodiment of the present invention 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 duplicated description will be omitted. In this specification, the front of the pile driving and extraction machine refers to the side of the entire device that grips the pile to be driven in when driving in the pile. For example, in the side view of FIG. 1 below, the right side of the device is the front of the pile driving and extraction machine. In addition, possible piles to be driven in include steel pipe piles, U-shaped steel sheet piles, hat-shaped steel sheet piles, concrete piles, various types of steel, etc., but in this embodiment, the piles will be described as steel pipe piles.

(Outline of the pile pressing and pulling machine)
Fig. 1 is a schematic side view of a pile driving/pulling machine 1 according to an embodiment of the present invention. As shown in Fig. 1, the pile driving/pulling machine 1 includes a saddle 10 constituting a main body (base portion), and a plurality of clamps 11 provided under the saddle 10. The clamps 11 have a function of fixing the saddle 10 by gripping an existing pile or a fixing portion set on the rear side of a reaction stand 2 (described later) by driving a hydraulic cylinder (not shown), and taking up the reaction force of the driving.

A slide frame 12 is provided on top of the saddle 10, and is slidable in the front-rear direction relative to the saddle 10. A mast 20, which serves as a rotating base, is configured on the slide frame 12 so as to be rotatable relative to the slide frame 12, centered on the center of the slide frame 12. The mast 20 is rotated by a rotary drive source (not shown), such as a motor, provided, for example, on the underside of the mast 20.

The chuck frame 25 and chuck 26 are arranged in front of the mast 20. The slide frame 12 serves as the base of the mast 20. As the slide frame 12 moves in the front-rear direction on the top surface of the saddle 10, the mast 20, chuck frame 25, and chuck 26 move forward and backward together. In addition, the chuck frame 25 and chuck 26 move up and down together as a unit due to the extension and retraction action of the main cylinder 30. The chuck 26 is configured to be rotatable on the underside of the chuck frame 25.

The chuck 26 is provided with an opening (not shown) through which the steel pipe pile U is inserted in the vertical direction, and chuck claws (not shown) for gripping the steel pipe pile U that has been passed through the opening. The chuck claws are composed of a movable claw and a fixed claw, and the movable claw is driven by a cylinder (not shown), so that the movable claw and the fixed claw can be moved toward and away from each other. The chuck 26 having such a configuration is used to grip and release the steel pipe pile U during pressing in, etc. The pile pressing-in and extraction machine 1 according to the embodiment of the present invention is configured as a so-called rotary pressing-in type pile pressing-in and extraction machine, in which the steel pipe pile U is pressed in by rotating the chuck 26 while gripping it, and raising and lowering the chuck 26 by operating the main cylinder 30 in that state.

(Outline of reaction stand configuration)
2A and 2B are schematic diagrams of the reaction pedestal 2 according to the embodiment of the present invention, in which (a) is a schematic side view and (b) is a schematic plan view. As shown in FIG. 2, the reaction pedestal 2 includes a pedestal unit 40 constituting a main body, crawler frames 42 on both sides of the pedestal unit 40, and crawlers 45 for running that are fixed to the pedestal unit 40 via the crawler frames 42. As shown in FIG. 2B, between the pedestal unit 40 and the crawler frame 42, the connection end of the crawler frame 42 is sandwiched with respect to connection parts 46 located on the four sides of the pedestal unit 40 in a plan view, and the connection is performed using a fixing mechanism 47 such as a cylinder. In addition, the crawler frame 42 is formed with protruding parts 42a that protrude in both sides of the reaction pedestal 2, and the protruding parts 42a are inserted and fixed in predetermined positions of the crawlers 45, thereby fixing the crawler frame 42 and the crawlers 45. That is, the mount unit 40, crawler frame 42, and crawlers 45 are detachable from one another, and when all the members are fixed, the reaction force mount 2 is integrally configured to have a substantially U-shape in plan view. Here, with regard to the configuration of the reaction force mount 2, the mount unit 40, crawler frame 42, and crawlers 45 being "integrally" configured does not necessarily mean that the respective members are always integrally configured, but is a concept that also includes a case where, for example, when the device is traveling, the respective members are connected by the function of the fixing mechanism 47, and when the device is not in use (for example, when it is being transported, etc.), the respective members are detached.

The base unit 40 is provided with a power relay unit 48 that is connected to a travel drive mechanism (not shown) such as a motor of the crawler 45, and the power relay unit 48 is provided with a connection line 49 that connects to a power source. A fixing unit 50 for gripping the clamp 11 of the pile driving and extraction machine 1 is configured in the center of the base unit 40. The configuration of the fixing unit 50 can be designed arbitrarily depending on the shape and configuration of the clamp 11, but in the form shown in Figure 2, the fixing unit 50 is configured with two circular fixing holes 52 (52a, 52b).

The mounting unit 40 is preferably made of metal having a predetermined weight or more, and the total weight of the reaction mounting unit 2, when combined with the weight of the crawler frame 42 and crawler 45, is preferably configured to be a predetermined weight or more. The total weight of the reaction mounting unit 2 is preferably designed based on the relationship between the total weight of the device when connected to the pile driving and extraction machine 1 and the required reaction force determined based on the ground to be driven and the type of pile to be driven (i.e., the construction conditions).

(Connection configuration between pile driving and extraction machine and reaction stand)
The pile driving/pulling machine 1 and the reaction force frame 2, which are configured as described above with reference to Figures 1 and 2, can be connected and fixed to each other using a clamp 11 and a fixing part 50. Figure 3 is a schematic explanatory diagram regarding the connection between the pile driving/pulling machine 1 and the reaction force frame 2, where (a) is a schematic diagram when connected, (b) is a schematic side view, and (c) is a schematic plan view. In Figure 3, the pile driving/pulling machine 1 is shown by a two-dot chain line, and the reaction force frame 2 is shown by a solid line.

As shown in FIG. 3(a), when connecting the pile driving/pulling machine 1 and the reaction frame 2, the pile driving/pulling machine 1 is lifted by a general crane R and lowered to a predetermined position above the reaction frame 2 that is placed in a predetermined position. In other words, it may be difficult to perform work using the crane R under overhead restrictions due to the presence of overhead obstacles, etc.

Next, as shown in FIG. 3(b), when the pile driving and extraction machine 1 is installed on the upper surface of the reaction frame 2, some of the clamps 11 provided on the pile driving and extraction machine 1 grip the fixing holes 52a, 52b of the frame part 40, thereby connecting the pile driving and extraction machine 1 and the reaction frame 2. When the pile driving and extraction machine 1 and the reaction frame 2 are connected, the chuck 26 of the pile driving and extraction machine 1 is configured to be located in the gap of the reaction frame 2, which is approximately U-shaped in a plan view, and the steel pipe pile U is gripped by the chuck 26. At this time, it is preferable to design the overall center of gravity of the pile driving and extraction machine 1 and the reaction frame 2 to be near the steel pipe pile U gripped by the chuck 26.

At the initial pressing-in of pile pressing-in and extraction work, the pile pressing-in and extraction machine 1 and the reaction frame 2 are connected as shown in FIG. 3, and the steel pipe pile U held by the chuck 26 is pressed in by obtaining a reaction force from the weight of the pile pressing-in and extraction machine 1, the reaction frame 2, and the steel pipe pile U (see FIG. 1). In addition, when the pile pressing-in and extraction machine 1 and the reaction frame 2 are connected, as shown in FIG. 3(b), a hydraulic source (not shown) that is the power source of the pile pressing-in and extraction machine 1 is used as the power source of the crawler 45 by connecting the connection line 49 via the power relay unit 48, and the power source of the pile pressing-in and extraction machine 1 such as the main cylinder 30 and the power source of the crawler 45 may be used in common.

(Schematic configuration of weight member)
In the state where the pile driving-in and extraction machine 1 is connected to the reaction stand 2 as described with reference to Fig. 3, a weight member 60 of a predetermined weight can be attached. Figs. 4 to 6 are schematic explanatory diagrams of the configuration in which the weight member 60 is attached, with Fig. 4 being a schematic side view, Fig. 5 being a schematic plan view, and Fig. 6 being a schematic front view.

As shown in Figures 4 to 6, the weight member 60 is installed above the chuck 26 of the pile driving/pulling machine 1, close to the chuck frame 25, via bracket members 62 on both sides. In this embodiment, the weight member 60 is configured with left and right weights 60a, 60b.

The weight member 60 is detachable and is installed as necessary, for example, when the reaction force from the pile driving-in and extraction machine 1, the reaction force stand 2, and the weight of the steel pipe pile U is insufficient during the initial driving-in of the pile driving-in and extraction work. The weight member 60 is preferably made of a metal having a weight of a predetermined weight or more, and is designed so that the total weight, when combined with the weight of the pile driving-in and extraction machine 1 and the reaction force stand 2, is a predetermined value or more. As an example, if the total weight of the entire device required by the work conditions (ground conditions, type of driving-in pile, etc.) is 100t, the weight of the stand part 40 is 40t, and the weight of the pile driving-in and extraction machine 1 is 30t, the weight of the weight member 60 is designed to be 30t or more. The required weight, the magnitude of the reaction force to be obtained during the pile driving-in and extraction work, varies depending on the work conditions, and when the weight of the pile driving-in and extraction machine 1 and the reaction force stand 2 is fixed, the weight of the entire device is adjusted by appropriately adjusting the weight of the weight member 60.

Note that although Figures 4 to 6 show the case where the weight member 60 is installed close to the chuck frame 25 via the bracket member 62, the position where the weight member 60 is installed can be designed arbitrarily. For example, the weight member 60 may be provided on the mounting unit 40 or the crawler frame 42. In this embodiment, the weight member 60 may be installed in a location with no overhead restrictions, and after the weight member 60 is installed, a process can be adopted in which the weight member 60 moves to the construction site (for example, the initial steel pile pressing position).

(Action and Effect)
According to the pile driving-in and extraction machine 1 and the reaction frame 2 of this embodiment described above with reference to Figures 1 to 6, the reaction frame 2 is self-propelled with the crawlers 45, so that the reaction frame 2 can be easily installed and removed regardless of the location of the initial driving-in of the pile driving-in and extraction construction. In particular, even in a location where it was difficult to install a reaction frame in the past, such as where an overhead obstacle exists at the driving-in position of the initial steel pile (under an overhead restriction), the reaction frame 2 can be easily installed, and driving-in work can be efficiently performed.

In addition, in conventional ground-mounted stands, weight piles were placed on both sides of the stand to press the stand against the ground, and an initial steel pile press-in reaction force was obtained. In that case, a space for placing the weight piles was required near the stand, and the stand installation area tended to be excessive. On the other hand, in the reaction stand 2 of this embodiment, the installation area is limited to the space where the crawlers 45 are installed on both sides of the stand part 40, so the overall installation area is smaller than before and it can be easily adapted to narrow places.

In addition, because the reaction support 2 is self-propelled, the support 40, crawler 45, etc. can be operated in an integrated state regardless of whether the pile driving/pulling machine 1 is moving or being driven in. This reduces the need for complicated work such as moving adjustments and separation of the device configuration, and improves work efficiency by allowing construction to begin immediately after driving.

In addition, under construction conditions where existing piles have already been installed when pile driving-in and extraction construction is performed, the reaction force frame 2 according to this embodiment can be used, and the pile driving-in and extraction machine 1 and the reaction force frame 2 can be self-propelled while connected, and the pile driving-in and extraction machine 1 can be installed in a manner that obtains a reaction force from the existing pile, and pile driving-in and extraction construction can be performed. In addition, construction using the reaction force frame 2 according to this embodiment is not limited to the continuous construction of steel pipe piles or the construction of continuous walls by fitting joint-type sheet piles, but can also be applied to the construction of single piles (driving in only one pile) and the construction of jump piles with a gap between the piles. In particular, when constructing jump piles, the pile driving-in and extraction machine 1 and the reaction force frame 2 can be self-propelled while connected to each other to reduce the distance between the piles, allowing the construction of jump piles to be performed efficiently.

In addition, in this embodiment, during the initial pressing-in of the pile pressing-in and pulling-out construction, the reaction force is generated by the weight of the mounting part 40 of the reaction force mount 2 and the weight of the weight member 60 that is installed as necessary. Therefore, there is no need to press in or pull out temporary piles to generate the reaction force, shortening the construction period and improving work efficiency. In addition, there is no need to load weight piles, as was previously used, and installation and removal are easier than with conventional ground-mounted reaction force mounts, improving workability.

In addition, the reaction force stand 2 according to this embodiment is configured so that the power source during self-propelling can be shared with the power source of the pile driving and extraction machine 1. This allows the reaction force stand 2 to be self-propelled without the need for a separate power source, simplifying the device and reducing costs. In the reaction force stand 2 according to this embodiment, the stand unit 40, crawler frame 42, and crawler 45 are used as an integrated unit during construction, but these are configured to be freely detachable. Therefore, during non-construction, such as when each component such as the stand unit 40, crawler frame 42, and crawler 45 is transported individually, each component can be transported separately, improving transportation efficiency. In particular, when using a large pile driving and extraction machine, there is a concern that the vehicle width during transportation will be large, but this problem is eliminated by transporting various components such as the crawler 45 separately.

Although one embodiment of the present invention has been described above, the present invention is not limited to the illustrated form. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

In the above embodiment, the pile driving and extraction machine 1 is fixed to the frame 40 via the clamp 11, and the pile driving and extraction machine 1 and the reaction frame 2 are connected to each other. However, the pile driving and extraction machine 1 and the reaction frame 2 may be connected to each other by different means. For example, in the above embodiment, the pile driving and extraction machine 1 is configured to include the saddle 10, the clamp 11, the slide frame 12, the mast 20, the chuck 26, etc., as described with reference to FIG. 1. However, each of these components constituting the pile driving and extraction machine 1 may be disassembled. In such a case, the reaction frame equipped with crawlers may be connected to the pile driving and extraction machine configured with the clamp 11 removed. In this case, an example of the connection method is to provide a hole for screwing as a fixing part in the frame and fix the saddle of the pile driving and extraction machine to the hole for screwing with a screw. In addition, the reaction frame equipped with crawlers may be connected to the configuration in which the lower structure (saddle 10 and clamp 11) of the pile driving and extraction machine 1 is removed. In this case, an example of a connection method is to provide a groove in the mounting part for fitting a slide frame as a fixed part, and then fit the slide frame of the pile driving and extraction machine into the groove to fix it.

In the above embodiment, the configuration in which the pile driving and extraction machine 1 is connected to the top of the reaction frame 2 has been described (see FIG. 3), but it is also possible to connect other devices to the reaction frame 2. For example, a clamp crane is known as a device used in pile driving and extraction construction, which grasps the pile with a clamp, raises and lowers the pile over a wide range in the vertical direction, and assists construction by the pile driving and extraction machine 1. By connecting this clamp crane to the reaction frame 2 and making it self-propelled, work can be performed using the clamp crane even when work using a general crane is difficult due to overhead restrictions. For example, it is useful when transferring the clamp crane to an existing pile (completed pile) due to overhead restrictions.

In addition, various modifications can be made to the configuration of the reaction stand 2. Below, we will explain modifications of the present invention related to the reaction stand 2 with reference to the drawings.

(Variation 1)
For example, in the above embodiment, the reaction force pedestal 2 has fixing holes 52a and 52b at two locations on the fixed portion 50, but the present invention is not limited to this. Specifically, the fixing holes on the fixed portion 50 may be one or three. Fig. 7 is a schematic diagram showing a modified example of the fixed portion 50, and is a schematic plan view of the reaction force pedestals 2a and 2b according to the modified example of the present invention. Note that, for each component shown in Fig. 7, 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 their description will be omitted.

As shown in FIG. 7(a), for example, the fixing part 50 may have only one fixing hole 50c, or as shown in FIG. 7(b), the fixing part 50 may have three fixing holes 50d-50f. With this configuration, when connecting the pile driving-in and extraction machine 1 to the reaction force stands 2a and 2b, multiple types of pile driving-in and extraction models can be connected, increasing the versatility of the reaction force stand. For example, considering that the stand 40 and the crawler 45 are detachable, efficient construction can be performed by using stand parts with different configurations of the fixing part 50 for multiple types of pile driving-in and extraction models.

(Variation 2)
In the above embodiment, no reference is made to the diameter of the fixing holes 52 (52a, 52b) of the mount unit 40, but the diameter of the fixing holes 52 may be arbitrarily changed (reduced) by the spacer member 70. Fig. 8 is a schematic explanatory diagram of a modified example of the mount unit 40 of the present invention. Note that in Fig. 8, some components having the same functional configuration are denoted by the same reference numerals as in Figs. 1 to 6 in the above embodiment, and description thereof will be omitted.

As shown in FIG. 8, in this modified example, a cylindrical spacer member 70 is installed inside the fixing hole 52. The installation of the spacer member 70 may be performed by any means as long as it can be fixed to the fixing hole 52. For example, it may be fixed by screws around the fixing hole 52, threading the spacer member 70 itself, or a locking mechanism for preventing rotation. The installation of this spacer member 70 can reduce the diameter of the fixing hole 52. It is known that the clamp-compatible diameter of the pile pressing and extracting machine that presses in the steel pipe pile U has various values depending on the diameter of the steel pipe pile to be pressed in. According to this modified example, the installation of the spacer member 70 can reduce the diameter of the fixing hole 52 to an arbitrary diameter, and even if the reaction stand has the same stand part 40, it can be used to correspond to various clamp-compatible diameters. In other words, by using the stand part 40 that constitutes the reaction stand in common, it is possible to reduce the number of members.

In this modified example, the spacer member 70 that reduces the diameter of the fixing hole 52 has been described assuming that the pile to be pressed in is a steel pipe pile, but a spacer member with the same effect can be installed when the pile to be pressed in is of another type. For example, even if the clamp shape of the pile pressing-in and extraction machine 1 is a hat-shaped steel sheet pile clamp other than a steel pipe pile clamp, this can be easily accommodated by switching to a suitable spacer member. That is, a suitable spacer member may be installed in the fixing hole 52 provided in the fixing part 50 of the mounting part 40 to make the configuration of the fixing hole 52 correspond to the clamp shape of the pile pressing-in and extraction machine.

(Variation 3)
In addition to the configuration of the reaction pedestal 2 described in the above embodiment, when existing piles are installed in front of or behind the reaction pedestal 2, a reaction arm may be further provided as a reaction means for obtaining a reaction force from the existing pile. Figure 9 is a schematic explanatory diagram of the reaction arm, and (a) is a schematic plan view and (b) is a schematic side view of a reaction pedestal 2c according to this modification example in which a reaction arm 80 is provided. Note that in Figure 9, some components having the same functional configuration are illustrated with the same reference numerals as those in Figures 1 to 6 in the above embodiment, and their description will be omitted.

9, in the reaction stand 2c according to this modification, a reaction arm 80 of a predetermined length that protrudes forward of the device is provided in front of the crawler frame 42 via a connecting member such as a pin. As shown in the figure, the reaction arm 80 is configured to be able to abut against the side (outer peripheral surface) of the existing steel pipe pile U1. As described above, in the construction using the pile driving and extraction 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 raised and lowered by the operation of the main cylinder 30 to drive the steel pipe pile U in, a so-called rotary driving method is used. At that time, a rotational moment is generated in the connected pile driving and extraction machine 1 and reaction stand 2c due to the rotational torque associated with the rotation of the chuck 26. In this modified example, by providing a reaction arm 80, even if a rotational moment occurs in the connected pile driving/pulling machine 1 and reaction stand 2c, the reaction force can be obtained from the existing steel pipe pile U1 via the reaction arm 80, preventing the pile driving/pulling machine 1 and reaction stand 2c from rotating.

In addition, the weight of the reaction arm 80 increases the weight of the entire device that is integrally configured as the reaction stand 2c, making it possible to generate a larger reaction force during pile pressing and extraction work. 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 generate the reaction force more efficiently during pile pressing and extraction work.

Note that, although the configuration of the reaction arm 80 has been illustrated and described here as being provided at one location in front of the crawler frame 42, the configuration of the reaction arm 80 is not limited to this. For example, the reaction arm 80 may be provided at two or more locations, or a configuration in which multiple reaction arms 80 are provided at one or multiple locations. This allows more reaction force to be obtained from the reaction arm 80. In addition, the tip of the reaction arm 80 may be freely movable in the vertical direction, so that the tip of the reaction arm 80 can be prevented from contacting the ground when the reaction stand 2c is self-propelled even if there is a step on the ground or the ground is inclined.

(Variation 4)
In addition to the configuration of the reaction pedestal 2 described in the above embodiment, when one or more existing piles are installed in front of or behind the reaction pedestal 2, a reaction member may be further provided as a reaction means for obtaining a reaction force from the one or more existing piles. Figure 10 is a schematic explanatory diagram of the reaction member 90, and (a) is a schematic plan view and (b) is a schematic side view of the reaction pedestal 2d according to this modification example when the reaction member 90 is provided. Note that in Figure 10, some components having the same functional configuration are illustrated with the same reference numerals as those in Figures 1 to 6 in the above embodiment, and their description will be omitted.

10, in the reaction stand 2d according to this modification, a reaction member 90 is provided in front of the crawler frame 42, protruding forward of the device. The reaction member 90 is composed of two extension members 91 (91a, 91b) extending forward from each of the crawler frames 42 on both sides of the reaction stand 2d, and gripping members 92 (92a, 92b) provided at two locations 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 stand 2d, pile pressing and extraction construction is performed with the existing piles gripped by the gripping members 92 of the reaction member 90. As a result, even if a rotational moment occurs between the pile driving-in and extraction machine 1 and the reaction frame 2c connected in the same manner as in the above-mentioned modified example 3, the reaction force can be obtained from the existing piles U2 and U3, preventing the pile driving-in and extraction machine 1 and the reaction frame 2c from rotating. In addition, by constructing the reaction member 90 from a metal having a predetermined weight, the weight of the entire device formed integrally with the reaction frame 2d increases, making it possible to obtain a larger reaction force during pile driving-in and extraction construction.

Note that, although the configuration of the reaction member 90 has been illustrated and described here as gripping two existing piles U2 and U3, the configuration of the reaction member 90 is not limited to this. For example, the reaction member 90 may grip either one or multiple existing piles.

As a reference variation of this embodiment, it is also possible to directly attach the crawler frame to the saddle of the pile driving/pulling machine with the clamp removed, or to the side portions of the slide frame of the pile driving/pulling machine with the lower structure (saddle and clamp) removed, by means of welding, screws, etc.

The present invention can be applied to a self-propelled reaction stand and a construction method used in the pile driving method.

Reference Signs List 1...Pile pressing and extraction machine 2...Reaction stand 10...Saddle 11...Clamp 12...Slide frame 20...Mast 25...Chuck frame 26...Chuck 30...Main cylinder 40...Stand section 42...Crawler frame 45...Crawler 48...Power relay section 49...Connection line 50...Fixing section 52...Fixing hole 60...Weight member 62...Bracket member 70...Spacer member 80...Reaction arm 90...Reaction member U...Steel pipe pile

Claims (6)

A self-propelled reaction stand that receives a reaction force when a steel pipe pile is rotated and driven into the ground by a pile driving and pulling machine.
A stand part having a fixing part for fixing the pile driving and pulling machine;
A crawler is provided integrally with the base unit via a crawler frame,
The base unit and the crawler frame are capable of self-propelling together by driving the crawlers, and
The pile pressing and extraction work can be performed by the pile pressing and extraction machine with the mounting unit, the crawler frame, and the crawler integrally connected,
The self-propelled reaction stand is provided with a reaction arm of a predetermined length extending in a rod shape protruding forward or backward from the self-propelled reaction stand,
When a moment occurs that rotates the self-propelled reaction stand to which the pile driving-in and extraction machine is fixed, the reaction arm of a predetermined length extending like a rod abuts against the outer peripheral surface of one or more existing piles, and a reaction force against only the rotational moment generated by the rotational driving of the steel pipe pile is obtained from the existing pile, thereby making it possible to prevent the self-propelled reaction stand to which the pile driving-in and extraction machine is fixed from rotating,
A self-propelled reaction stand, characterized in that the tip of the reaction arm is configured to be freely movable in the vertical direction so as to prevent contact with the ground . The self-propelled reaction stand described in claim 1, characterized in that one or more fixing holes are formed in the fixing part, and a spacer member is provided in a removable manner to match the shape of the fixing hole to the clamp shape of the pile driving and extraction machine. The self-propelled reaction stand described in claim 1, characterized in that when the pile driving and extraction machine is fixed to the stand, a weight member of a predetermined weight and a bracket member for mounting the weight member are detachably attached to the chuck frame of the pile driving and extraction machine. The self-propelled reaction stand described in claim 1, characterized in that one end of the reaction arm is attached to a crawler frame of the self-propelled reaction stand. The self-propelled reaction stand described in claim 1, characterized in that the power source of the crawler is configured to use the power source of the pile driving and extraction machine when the pile driving and extraction machine is fixed to the stand part. A construction method for performing pile driving and extraction construction using the self-propelled reaction stand according to any one of claims 1 to 5 with the pile driving and extraction machine,
The pile driving and extraction machine is provided with a chuck for gripping the steel pipe pile,
The steel pipe pile is rotated while being gripped by the chuck, and the chuck is raised and lowered to perform pile pressing and extraction of the steel pipe pile,
This pile driving/pulling construction method is characterized in that the reaction arm is abutted against the outer peripheral surface of the existing pile, and a reaction force is obtained from the existing pile only against the rotational moment generated in the pile driving/pulling machine and the self-propelled reaction stand as the steel pipe pile is rotated and driven in.

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