Bolt tightening management system for assembling pile driver

Abstract

To provide a fastening management system capable of performing fastening management of a bolt for pile driver assembly.SOLUTION: A bolt tightening management system for pile driver assembly, which manages a tightened state of a bolt at a connection point (flange connection part) where members of a component (leader) of a pile driver are connected to each other in assembly work of the pile driver at a construction site, the bolt tightening management system comprising: A torque wrench 54 includes an acquisition part 58 for acquiring fastening position information from an identification tag 53 stuck corresponding to a position of a bolt hole of a connection part, and transmits fastening completion information generated by fastening a bolt to set torque to a fastening management device 52 in association with the fastening position information. The tightening management apparatus 52 includes a display unit 60, a storage unit 61 that stores tightening work plan information for setting a connection point between members, and a control unit 62 that causes the display unit 60 to display, as visually confirmable tightening management information, a relationship between tightening position information and tightening completion information with respect to the tightening work plan information.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a tightening management system for bolts used in assembling pile drivers, and more particularly to a tightening management system for managing the tightening state of bolts that connect components of leaders and backstays. [Background technology]

[0002] A three-point support pile driver includes, as its components, long structures such as a leader and a backstay that supports the leader (see, for example, Patent Document 1). The leader and backstay are transported in lengths suitable for transportation, so when assembling them at the construction site, multiple components of various lengths placed in front of the base machine are connected together (so-called ground assembly), and then the leader is erected on the base machine using a pendant rope and a derricking rope that are stretched across the tip of the leader (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-25526 [Patent Document 2] Japanese Patent Application Publication No. 2019-27046 Summary of the Invention [Problem to be solved by the invention]

[0004] When assembling long structures like those mentioned above, bolts are used to connect the components together, and a torque wrench (designated tool) is used to check whether the bolts are tightened to the specified torque. However, this type of checking work raises concerns that a bolt that needs to be checked may be overlooked due to the structure of the connection points, where many bolts are arranged circumferentially. Furthermore, while it is possible to have a site manager present during the checking work, keeping in mind the possibility of human error, this would be time-consuming and labor-intensive.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a tightening management system that can manage the tightening of bolts for assembling pile drivers. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a pile driver assembling bolt tightening management system for managing the tightening status of bolts at connection points that connect components of a pile driver during assembly work at a construction site, the system comprising: an identification tag that is affixed to a bolt hole at the connection point and that stores tightening position information that identifies the bolt hole position; and an acquisition unit that acquires the tightening position information from the identification tag, and associates tightening completion information generated by tightening the bolt to a set torque with the tightening position information and stores it in the base of the pile driver. and a torque wrench that transmits the information to a tightening control device mounted on the machine, and the component is a reader that is erected so as to be able to rise and fall on the base machine, and the reader connects multiple cylindrical members coaxially, and the connection points of the members are fastened using multiple bolts, and the tightening control device is characterized by having a display unit, a memory unit that stores tightening work plan information that sets the connection points of the members, and a control unit that causes the display unit to display the relationship between the tightening position information and the tightening completion information relative to the tightening work plan information as visually confirmable tightening control information.

[0007] In addition, the tightening management device has a judgment unit that judges whether the tightening state of multiple bolts at the connection points between the components is in a tightening completion state in which all bolts are tightened to the set torque, and the control unit is characterized in that when the judgment unit determines that the tightening completion state is not reached, it performs control to regulate the raising and lowering movement of the leader.

[0008] Furthermore, the tightening management device is characterized by including an external storage device that acquires the tightening position information and the tightening completion information from the tightening management device, and the tightening completion information includes the tightening date and time.

[0009] In addition, the components include a backstay that supports the leader, and the backstay connects multiple cylindrical members coaxially, and the connection points between the members are fastened using multiple bolts. [Effects of the Invention]

[0010] According to the pile driver assembly bolt tightening management system of the present invention, the torque wrench used to tighten the bolts that connect the constituent parts of the leader acquires tightening position information from the identification tag corresponding to the position of the bolt hole, and transmits tightening completion information generated by tightening the bolts to the set torque in association with the tightening position information. This is then received by the tightening management device, which displays the relationship between the tightening position information and the tightening completion information relative to the tightening work plan information on the display unit as visually confirmable tightening management information.This allows third parties such as operators and users other than the assembly worker to visually confirm the tightening status of the bolts at the connection points while maintaining the conventional standard work procedures, contributing to safety, quality, and improved working conditions in the on-site environment specific to pile construction.

[0011] Furthermore, if the judgment unit determines that the tightening is not complete, it controls the leader's raising and lowering operation, thereby avoiding dangers caused by imperfect connections and further improving safety. Furthermore, the system is equipped with an external storage device and includes the tightening date and time in the tightening completion information, meeting the need for evidence regarding the pile driver's assembly status. Furthermore, it can handle various combinations of components in the diverse field environments in which pile drivers are used, and can track the tightening history for connections that are not usually disconnected, thereby improving traceability under user management. In addition, since the backstay is included in the tightening status management, tightening management information can be created using the same process flow as tightening work to connect the leader's components. This allows for a series of controls, such as display and judgment, making it particularly effective as a system applied to three-point support pile drivers. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a side view of a pile driver to which a system showing an embodiment of the present invention is applied; [Figure 2] FIG. 10 is an explanatory diagram of the connection points that connect the constituent members of the leader and backstay to each other. [Figure 3] FIG. 10 is a side view showing the state of the pile driver when the leader is connected. [Figure 4] FIG. 10 is a side view showing the state of the pile driver before the leader is raised. [Figure 5] FIG. 10 is a side view showing the connection points between the leader members. [Figure 6] 6 is a cross-sectional view taken along the line VI-VI in FIG. 5. [Figure 7] FIG. 10 is a side view showing the connection points of the stay members. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 10 is a diagram showing an outline of the system. [Figure 10] FIG. 10 is a diagram showing the display of tightening management information. DETAILED DESCRIPTION OF THE INVENTION

[0013] 1 to 10 show one embodiment of the system for managing bolt tightening for assembling pile drivers of the present invention, and the pile driver 11 to which the system shown in this embodiment is applied has a base machine 14 formed by rotatably mounting an upper rotating body 13 on a lower traveling body 12 equipped with crawlers, as shown in Fig. 1. The upper rotating body 13 has a winch mounting section (not shown) mounted in the center of the machine frame on which various winch devices including a hoisting winch, a main hoisting winch, and an auxiliary hoisting winch are mounted, a cab 15 on the right side where the operator sits, and a power unit 16 on the left side on which an engine, hydraulic pump, etc. are mounted.

[0014] A leader bracket 19 to which a leader 17 and front jacks 18, 18 are attached is provided at the front of the upper rotating body 13. A raisable gantry 20 is provided above the rear of the upper rotating body 13, and a counterweight 21 is mounted at the rear end of the upper rotating body 13, with rear jacks 22, 22 and stay mounting portions 23, 23 provided on both sides of the frame on which the counterweight 21 is mounted.

[0015] The leader 17 comprises a cylindrical fixed leader 24 pivotally supported on the leader bracket 19 so as to be swingable in the front-rear and left-right directions, and a cylindrical rotating leader 25 coaxially and rotatably erected on the fixed leader 24, with a stay holder 26 provided in the middle to rotatably hold the rotating leader 25. A hoisting rope 27 from the hoisting winch is connected to the rear of the stay holder 26 via a pendant rope 28, and the upper ends of a pair of left and right backstays 29, 29 erected on the stay mounting portions 23, 23 are also connected to the stay holder. The rotating mechanism of the leader 17 can be seen, for example, in the structure disclosed in Patent Document 1.

[0016] A main hoisting guide sheave 31 that guides the main hoisting rope 30 from the main hoisting winch and an auxiliary hoisting guide sheave 33 that guides the auxiliary hoisting rope 32 from the auxiliary hoisting winch are provided on the upper surface of the leader bracket 19. The ropes 30, 32 rise from the main hoisting guide sheave 31 and the auxiliary hoisting guide sheave 33, pass behind the leader 17, and hang down to the front of the leader 17 via an intermediate guide sheave 34 attached to the stay holder 26 and a top sheave 35 attached to the upper end of the leader 17. The tip of the main hoisting rope 30 is attached to an auger (not shown) that can move up and down along the front surface of the leader 17, and the tip of the auxiliary hoisting rope 32 is attached to a lower guide (not shown).

[0017] The hoisting rope 27 rises upward from the hoisting winch, passes through a guide sheave 36 provided at the top end of the gantry 20, and is wound multiple times around multiple sheaves in a middle sheave block 37 and multiple sheaves in a gantry sheave block 38 provided at the top end of the gantry 20. By driving the hoisting winch, the leader 17 can be raised or lowered via the hoisting rope 27, middle sheave block 37, and pendant rope 28.

[0018] The rotary leader 25 is made up of multiple cylindrical leader members connected coaxially, and is divided into a lower leader member 39 connected to the top of the fixed leader 24, an intermediate leader member 40 connected to the top of the lower leader member 39, and an upper leader member 41 connected to the top of the intermediate leader member 40.Furthermore, the intermediate leader member 40 is divided into an intermediate first leader member 40a, an intermediate second leader member 40b, and an intermediate third leader member 40c.

[0019] As shown in FIGS. 5 and 6 , each leader member has a connection point (flange connection portion) 42 formed by abutting annular flanges 42a, 42a corresponding to the cross-sectional shape of the leader 17 at adjacent portions, and fastened using a plurality of bolts 43 and nuts 44. Each connection point 42 has the same structure, with the same shape of the flanges 42a, the same size of the bolt holes 42b, and the same circumferential pitch. In this embodiment, 24 bolt holes 42b (bolt hole numbers A1 to A24) are provided at equal intervals for each connection point 42. That is, 24 bolts 43 are used to fasten the connection points 42. The connection points 42 formed in this manner can be rearranged to accommodate a plurality of leader members of various lengths by removing the bolts 43 and nuts 44 and releasing the flange connection.

[0020] The backstay 29 is made up of multiple cylindrical stay members connected coaxially and is formed separately from a stay cylinder (hydraulic cylinder) 45, an intermediate stay member 46 connected to the upper part of the stay cylinder 45, and an upper stay member 47 connected to the upper part of the intermediate stay member 46, and the intermediate stay member 46 is further formed separately from a first intermediate stay member 46a, a second intermediate stay member 46b, and a third intermediate stay member 46c. The two backstays 29, 29 that make up a pair on the left and right can adjust the tilt of the leader 17 in the front-to-rear and left-to-right directions by the extension and contraction of the stay cylinders 45, 45 while supporting the leader 17 from the rear.

[0021] As shown in FIGS. 7 and 8 , each stay member has a connection point (flange connection portion) 48 formed by abutting annular flanges 48a, 48a corresponding to the cross-sectional shape of the backstay 29 at adjacent portions, and fastened using multiple bolts 49 and nuts 50. Each connection point 48 has the same structure, with the same shape of the flanges 48a, the same size of the bolt holes 48b, and the same circumferential pitch. In this embodiment, ten bolt holes 48b (bolt hole numbers B1 to B10) are provided at equal intervals for each connection point 48. That is, ten bolts 49 are used to fasten the connection points 48. The connection points 48 formed in this manner can be reassembled to combine multiple stay members of various lengths by removing the bolts 49 and nuts 50 to release the flange connection.

[0022] In order to meet the size and weight transportation restrictions of this three-point support pile driver 11, components such as the leader 17, backstay 29, and counterweight 21 are separated from the upper rotating body 13 and transported separately, and then assembled and used at the construction site. In this case, the division method (transportation unit or reassembly unit) of long structures such as the leader 17 and backstay 29 is determined taking into account transportability and assembly at the construction site. For example, as shown in FIG. 2, when dividing the leader 17, division points are provided between the fixed leader 24 and the lower leader member 39 and between the intermediate second leader member 40b and the intermediate third leader member 40c. On the other hand, when dividing the backstay 29, division points are provided between the intermediate second stay member 46b and the intermediate third stay member 46c. These division points become connection points 42, 48 between the components during the assembly of the pile driver 11 at the construction site.

[0023] When the pile driver 11 is delivered to the construction site, the leader 17 and backstay 29 are placed in front of the base machine 14 and assembled on the ground, as shown in Figure 3. After that, the backstay 29 is temporarily assembled with the upper stay member 47 connected to the stay holder 26, as shown in Figure 4, and the stay cylinder 45 at the lower end is placed in a free state. Then, the pendant rope 28 connected to the back of the leader 17 is connected to the derrick rope 27 via the middle sheave block 37, and the derrick rope 27 is wound up by the derrick winch via the gantry 20, thereby erecting the leader 17 and backstay 29 on the base machine 14 (Figure 1).

[0024] Incidentally, when assembling the leader 17 and backstay 29, a torque wrench (designated tool) has traditionally been used to check whether the bolts 43, 49 are tightened to the specified torque. However, this type of checking process raises concerns that a bolt may be overlooked due to the large number of bolts 43, 49 arranged at equal intervals circumferentially at the connection points 42, 48. Furthermore, while it is possible to have a site manager present during the checking process to prevent human error, this would require time and effort. Therefore, in order to improve the safety, quality, and working environment of the site environment specific to pile construction, a tightening management system has been developed that can manage the tightening of bolts used in pile driver assembly.

[0025] 9 shows a schematic configuration of the tightening management system 51. The tightening management system 51 is generally configured to include a tightening management device 52 mounted on the base machine 14 of the pile driver 11, a plurality of identification tags 53 (see FIGS. 5 to 8) that are affixed to correspond to the positions of the bolt holes 42b, 48b (bolt hole numbers A1 to A24, B1 to B10) of the connection points 42, 48 and that store tightening position information that identifies the positions of the bolt holes 42b, 48b, a torque wrench 54 that associates tightening completion information generated by tightening the bolts 43, 49 to a set torque with the tightening position information and transmits it to the tightening management device 52, and an external storage device including a server (for example, a cloud server) 55 that acquires various information from the tightening management device 52 and a removable medium such as a USB memory 56.

[0026] In the network configuration between the various devices, the torque wrench 54 and the tightening management device 52 are connected, for example, by short-range wireless communication using a communication module built into the device. An example of a short-range wireless communication standard is Bluetooth (registered trademark). Meanwhile, wireless communication is performed between the tightening management device 52 and the server 55 in accordance with a communication standard such as LTE. The server 55 provides a management site that can be accessed by an information terminal 57 using, for example, a web browser. Examples of the information terminal 57 include a personal computer in a management facility (for example, a construction management company) far from the construction site, and a tablet terminal or smartphone carried by a site worker or manager.

[0027] The identification tag 53 is a metal, outdoor-compatible wireless tag (so-called passive RFID tag) and is affixed to the outer peripheral surfaces of the flanges 42a, 48a in the immediate vicinity of the bolt holes 42b, 48b, for example, on the outer circumferential surface of the flanges 42a, 48a, radially outward from the reader (radially outward from the backstay) with respect to the positions of the bolt holes 42b, 48b, as shown in Figures 5 and 7. The identification tag 53 stores the names of the component members and the bolt hole numbers A1 to A24, B1 to B10 as fastening position information that identifies the positions of the bolt holes 42b, 48b.

[0028] The names of the constituent members distinguish between the upper (one end) flanges 42a, 48a and the lower (other end) flanges 42a, 48a that form the connection points 42, 48. For example, at the connection point 42 between the fixed leader 24 and the lower leader member 39, the lower leader member 39 side is given the name "lower leader lower side" (see also FIG. 10(a)). This name "lower leader lower side," i.e., the name of the constituent member, is unique identification information that does not change even if the connection destination is a different member. The name of the constituent member can include the length of the member, for example, "5.8 m leader lower side." Furthermore, if there are multiple members of the same length and no distinction is required, these members can be given the same name.

[0029] The bolt hole numbers A1 to A24 and B1 to B10 are aligned uniformly among the multiple coaxially arranged connection points 42, 48. For example, at each connection point 42 of the leader 17, as shown in Fig. 6, the bolt hole numbers A1 at the top are numbered clockwise in the order A2, A3, ..., A24, with the ascent / descent path of the auger (not shown) positioned directly below (the bottom of Fig. 6). In this embodiment, the hole numbers on both the upper and lower flanges of the constituent members are numbered clockwise when viewed from above to below the leader 17, so that the hole numbers on the upper and lower flanges match at the connection points.

[0030] The torque wrench 54 is a preset torque wrench capable of tightening the bolts 43, 49 to a preset torque. Although not shown, the head (spanner-shaped or socket-shaped) and rod (handle) are configured to rotate relative to each other, and a torque limiter is built in. When the bolt tightening torque of the head reaches the set torque, the restriction by the torque limiter is released, the head and rod rotate relative to each other, and the head snaps against the rod, producing a clicking sound. This allows the operator to intuitively confirm that the bolts 43, 49 have been tightened in response to the operation of the torque wrench 54.

[0031] The circuit configuration of the torque wrench 54 mainly includes a control circuit section, a power supply section (e.g., a battery), an acquisition section (e.g., an RFID sensor) 58 that acquires tightening position information from the identification tag 53, and a detection section 59 that detects when the set torque has been reached. The detection section 59 is, for example, a microswitch that detects rotation of the head section (neck breakage). The control circuit section is equipped with a clock function that acquires information regarding the tightening date and time (current time) in response to the on-activation of the microswitch. Furthermore, the antenna position of the acquisition section 58 is considered so that the strength of the radio waves emitted toward the identification tag 53 is high when the head section of the torque wrench 54 is set (usually set on the nut 44, 50 side), and the range of the radio waves is also narrowed.

[0032] The tightening management device 52 is installed, for example, integrally with a construction management device (not shown) in the driver's cab 15, and is generally configured to mainly include a display unit 60 (for example, a touch panel display) with a display screen, a memory unit 61 in which tightening work plan information for setting the connection points 42, 48 is stored, a control unit 62 that displays the relationship between tightening position information and tightening completion information for the tightening work plan information on the display unit 60 as visually verifiable tightening management information (information in tabular form) as shown in Figures 10(a) to (c), respectively, and a judgment unit 63 that judges whether the tightening states of the multiple bolts 43, 49 for the connection points 42, 48 are all in a tightening completion state in which they have been tightened to the set torque.

[0033] The tightening work plan information is input into a computer in the office in advance based on a construction plan created based on which components will be connected together during the assembly work of the pile driver 11 at the construction site, and includes the names of the components, bolt hole numbers A1 to A24, B1 to B10, bolt specifications, tightening torque, etc. as items related to the connection points 42, 48. The created tightening work plan information is then uploaded to the server 55 with the pile driver 11 model number, construction date, etc. added.

[0034] Furthermore, when the determining unit 63 determines that the tightening is not complete, the control unit 62 controls to restrict the hoisting operation of the leader 17. The tightening completion state refers to a state in which tightening completion information, including the tightening torque and tightening date and time, is associated with the component names and bolt hole numbers A1-A24, B1-B10 set in the tightening work plan information. In other words, the tightening completion information obtained using the torque wrench 54 is used as a flag to determine the tightening completion state. Here, the operation of the leader 17 is restricted, for example, by providing a control valve (electromagnetic switching valve) 64 in the hydraulic circuit that drives the hoisting winch, and when it is determined that the tightening is not complete, the control unit 62 issues a restriction signal to the control valve 64, thereby controlling to maintain the hydraulic supply to the hoisting winch in a restricted state (Fig. 9).

[0035] In the tightening management system 51 constructed in this manner, when the tightening management device 52 is turned on and started up, the basic program is executed and a login screen is displayed on the display unit 60. Here, when the user logs in to the system and selects a work target from the menu screen, a communication connection with the server 55 is established, for example, and the tightening work plan information is downloaded.

[0036] The tightening work plan information sets the names of the constituent parts, for example, as in the division method shown in Figure 2, by combining "lower leader lower side" and "fixed leader" (Figure 10(a)) as names corresponding to the connection point 42 between the lower leader member 39 and the fixed leader 24, "intermediate third leader lower side" and "intermediate second leader upper side" (Figure 10(b)) as names corresponding to the connection point 42 between the intermediate third leader member 40c and the intermediate second leader member 40b, and "intermediate third stay lower side" and "intermediate second stay upper side" (Figure 10(c)) as names corresponding to the connection point 48 between the intermediate third stay member 46c and the intermediate second stay member 46b.

[0037] The tightening status of the bolts 43, 49 is checked collectively for each connection point 42, 48. Specifically, with the torque wrench 54 turned on, the bolts 43, 49 are tightened in order according to the work standard. When the bolt tightening torque of the head reaches the set torque, that is, when the detection unit 59 detects it (turns on the microswitch), the acquisition unit 58 emits a radio wave (Fig. 9).

[0038] Here, two identification tags 53, 53 adjacent to each other in the bolt axial direction (left-right direction in FIGS. 5 and 7), which is the direction in which the bolts 43, 49 are tightened, receive radio waves from the acquisition unit 58 and generate electricity, and use the power thus obtained to emit radio waves indicating tightening position information including a common bolt hole number (e.g., A1). As a result, the acquisition unit 58 receives radio waves indicating the tightening position information from each identification tag 53, 53 and acquires that information. In the control circuit unit, when the detection unit 59 detects (turns on the microswitch), it generates the tightening torque (set torque) and tightening date and time (current time) as tightening completion information, and associates this information with the tightening position information (the names of the components (e.g., "lower leader below" and "fixed leader") and the bolt hole number (e.g., A1)) and transmits it to the tightening management device 52 (FIG. 9).

[0039] The tightening management device 52 receives various information from the torque wrench 54 and displays the tightening management information on the display unit 60 in a table format as shown in FIG. 10. In this case, control is performed to display the display target (tightening management information) for the connection points 42, 48 in a list or individually in response to touch panel operations on the display screen. The display content includes the tightening completion status and tightening date and time corresponding to each bolt hole number A1 to A24, B1 to B10. Therefore, if a bolt is left untightened, the display content (character string) that should be displayed corresponding to the bolt hole number, such as "Complete," "tightening torque (kN·m)," and "date and time," is missing, making it possible to visually determine that a bolt has been left untightened (see, for example, bolt hole number A3 in FIG. 10(b)). Furthermore, if a bolt is left untightened, the determination unit 63 determines that the tightening completion state has not been reached, and control is performed to restrict the raising and lowering operation of the reader 17.

[0040] The tightening management information created in this way is stored in the memory unit 61 of the tightening management device 52, and then, for example, a copy thereof is uploaded to the server 55 and stored in a database on the network, where the information is registered and updated, i.e., the tightening status is managed. This allows the worker to check the work status by making an inquiry from an information terminal (e.g., a tablet terminal) 57 that he or she carries. Furthermore, when transferring the tightening management information to a USB memory 56, the site manager can bring the USB memory 56 containing the tightening management information to the management office and transfer the data to an information terminal (e.g., a personal computer) 57, thereby making it possible to check the tightening management information for any purpose, such as verifying the work status.

[0041] In this way, according to the pile driver assembly bolt tightening management system 51 of the present invention, the torque wrench 54 used in tightening the bolts 43 that connect the constituent parts of the leader 17 acquires tightening position information from the identification tag 53 that corresponds to the position of the bolt hole 42b (bolt hole numbers A1 to A24), and transmits tightening completion information generated by tightening to the set torque in association with the tightening position information. This is received by the tightening management device 52, and the relationship between the tightening position information and the tightening completion information relative to the tightening work plan information is displayed on the display unit 60 as visually confirmable tightening management information. Therefore, while maintaining the conventional standard work procedures, it becomes possible to visually confirm the tightening status of the bolts 43 at the connection points 42, which contributes to improving the safety, quality, and working environment of the site environment specific to pile construction.

[0042] Furthermore, if the determination unit 63 determines that the tightening is not complete, the system controls the leader 17 to restrict its raising and lowering operation, thereby avoiding dangers caused by imperfections in the connection points 42 and further improving safety. Furthermore, the system is equipped with external storage devices 55, 56, and the tightening completion information includes the tightening date and time, thereby meeting the need for evidence regarding the assembly status of the pile driver 11. Furthermore, the system can accommodate various combinations of components in the diverse field environments in which the pile driver 11 is used, and can track the history of when tightening work (or tightening records) was performed for connection points 42 that are not usually disconnected, thereby improving traceability under user management. In addition, since the backstay 29 is included in the tightening status management targets, tightening management information can be created using the same processing flow as for tightening work to connect the components of the leader 17. This allows for a series of controls, such as display and judgment, making the system particularly effective as a system applied to a three-point support pile driver 11.

[0043] The present invention is not limited to the above-described embodiment, and the tightening control device constituting the system may be used as an add-on to an existing construction control device. Furthermore, while the tightening control information is displayed in a table format in the embodiment, this is merely an example, and any information may be displayed in a tabular format as long as it allows for relative comparison of each type of information. For example, graphical information including images of cross sections of component parts (see Figures 6 and 8) may be displayed. Furthermore, the torque wrench may be equipped with a tightening torque detection function, and the specifications and placement of the identification tag may be modified as appropriate depending on the conditions of use. In addition, control based on the judgment results may include operational restrictions and the issuance of alarms (sound or light) to alert the worker. [Explanation of symbols]

[0044] 11...pile driver, 12...lower running body, 13...upper rotating body, 14...base machine, 15...operator's cab, 16...power unit, 17...leader, 18...front jack, 19...leader bracket, 20...gantry, 21...counterweight, 22...rear jack, 23...stay mounting part, 24...fixed leader, 25...rotating leader, 26...stay holder, 27...deployment rope, 28...pendant rope, 29...backstay, 30...main hoisting rope, 31...main hoisting guide sheave, 32...auxiliary hoisting rope, 33...auxiliary hoisting guide sheave, 34...intermediate guide sheave, 35...top sheave, 36...guide sheave, 37...middle sheave block, 38...gantry sheave block, 39...lower leader member, 40...intermediate leader member, 40a...intermediate first ri leader member, 40b...second intermediate leader member, 40c...third intermediate leader member, 41...upper leader member, 42...connection point, 42a...flange, 42b...bolt hole, 43...bolt, 44...nut, 45...stay cylinder, 46...intermediate stay member, 46a...first intermediate stay member, 46b...second intermediate stay member, 46c...third intermediate stay member, 47...upper stay member, 48...connection point, 48a...flange, 48b...bolt hole, 49...bolt, 50...nut, 51...tightening management system, 52...tightening management device, 53...identification tag, 54...torque wrench, 55...server, 56...USB memory, 57...information terminal, 58...acquisition unit, 59...detection unit, 60...display unit, 61...storage unit, 62...control unit, 63...determination unit, 64...control valve

Claims

1. A pile driver assembly bolt tightening management system that manages the tightening state of bolts at connection points that connect components of a pile driver during assembly work of the pile driver at a construction site, an identification tag that is affixed to the connection portion in correspondence with the position of a bolt hole and stores fastening position information that identifies the position of the bolt hole; and a torque wrench that includes an acquisition unit that acquires the tightening position information from the identification tag, and that associates tightening completion information generated by tightening the bolt to a set torque with the tightening position information and transmits the information to a tightening management device mounted on a base machine of the pile driver. The component is a leader that is erected on the base machine in a foldable manner, The leader is made by connecting a plurality of cylindrical members coaxially, and fastening the connection points of the members together using a plurality of bolts, The tightening management device includes: A display unit; a storage unit that stores fastening work plan information that sets the connection points between the members; A tightening management system for bolts used in assembling pile drivers, characterized by having a control unit that displays on the display unit the relationship between the tightening position information and the tightening completion information relative to the tightening work plan information as visually confirmable tightening management information.

2. the tightening management device has a determination unit that determines whether or not the tightening states of the plurality of bolts at the connection points between the members are all in a tightening completion state in which they are tightened to a set torque, The tightening management system for bolts for assembling pile drivers according to claim 1, characterized in that the control unit performs control to restrict the raising and lowering operation of the leader when the judgment unit determines that the tightening is not complete.

3. an external storage device that acquires the fastening position information and the fastening completion information from the fastening management device; 2. The system for managing bolt tightening for assembling pile drivers according to claim 1, wherein the tightening completion information includes tightening date and time.

4. The components include a backstay that supports the leader; A bolt tightening management system for assembling pile drivers as described in any one of claims 1 to 3, characterized in that the backstay connects multiple cylindrical members coaxially, and the connection points between the members are fastened using multiple bolts.

Images