JP2023058064A - Joint method of steel pipe pile - Google Patents

Abstract

PURPOSE: To provide a joint method of steel pipe piles allowing a welding bogie to travel in a stable state and allowing homogeneous weldment quality to be achieved.CONSTITUTION: A joint method for welding a joint line between a first steel pipe pile and a second steel pipe pile using a weldment device to move in a circumferential direction along the outer periphery of the steel pipe piles, comprises steps of: attaching a doughnut-shaped travel guide plate in a horizontal state so as to surround the outer periphery of a part near an upper end of the first steel pipe pile at a position near a lower part of the joint line over the periphery; and making a weldment bogie of a specific structure travel on the outer periphery in the circumferential direction while magnetically attached on the outer periphery surface of the second steel pipe pile at a position higher than the joint line, as well as making the weldment bogie travel for weldment while checking its position by bringing a roller of a guide roller part into contact with an upper surface of the travel guide plate.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a method for connecting steel pipe piles, and more particularly to a method for welding joints using a welding carriage that moves circumferentially around the outer circumference of a steel pipe pile when adding vertical pile piping.

In the construction of vertical pile piping, etc., multiple steel pipes are prepared at the site, and the work is progressing while sequentially joining them by welding.
The welded connection of the steel pipe piles is performed by circumferentially welding the joint, which is the butted portion, in a state in which the upper end of the first steel pipe pile, which is the lower pile, and the lower end of the second steel pipe pile, which is the upper pile, are butted against each other. do.
During this circumferential welding, a running rail is attached to the outer periphery of the steel pipe pile, and the joint is welded while a welding carriage is run on this running rail (see, for example, Patent Documents 1 to 3). ).

JP-A-8-281483 Japanese Patent Application Laid-Open No. 2005-334916 Patent No. 4040076

In the techniques of Patent Documents 1 to 3, an annular traveling rail is attached to the outer circumference of the steel pipe in a state separated from the outer peripheral surface, and the welding torch is mounted on the welding carriage while traveling on the traveling rail. It is a configuration in which the seams are welded by.

However, in the techniques of Patent Documents 1 to 3, the weight of the welding carriage and the load during running are all applied, so it is necessary to have a high-strength running rail configuration that can withstand the weight and load of the welding carriage in the running state. In addition, the mounting strength of the running rail to the steel pipe pile is also required. If even one of these strength conditions is inadequate, the trajectory of the welding carriage will not be stable, causing fluctuations, and the welding torch to the seams will become unstable, resulting in poor welding quality. Not only is it stable, but there is also the problem of poor welding.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for connecting steel pipe piles that allows a welding carriage to travel in a stable state and to obtain uniform welding quality.

The present invention for solving the above problems has the following configuration.

1. A steel pipe pile that welds a joint between a first steel pipe pile and a second steel pipe pile that is connected to the top of the first steel pipe pile using a welding device that moves circumferentially around the outer circumference of the steel pipe pile. In connection method,
A donut-shaped travel guide plate is horizontally attached over the entire circumference so as to surround the outer periphery of the portion near the upper end of the first steel pipe pile that is near the bottom of the joint,
A welding carriage having the following configuration is caused to travel in the circumferential direction on the outer peripheral surface of the second steel pipe pile above the joint while being magnetically attracted to the outer peripheral surface, and a guide roller portion is provided on the upper surface of the travel guide plate. Welding by running the welding carriage while checking the position by contacting the roller,
A method for connecting steel pipe piles.
"Construction of Welding Cart"
A plurality of wheel portions which are mainly formed of magnets and which run and rotate while being magnetically attracted to the outer peripheral surface of the second steel pipe pile by the magnets, a driving mechanism for running and rotating the wheel portions, and a joint which is a welding point. and a guide roller portion for following the weld line by contacting a roller that freely travels against the travel guide plate.

2. Two rollers are provided, and these two rollers are configured to contact the travel guide plate at two locations spaced apart in the circumferential direction, and welding is performed by the welding torch portion at the position between the two locations where the rollers contact. 2. The method for connecting steel pipe piles according to the above 1, characterized in that the configuration is performed.

3. 3. The steel pipe according to 1 or 2 above, wherein the contact position of the roller with the travel guide plate is a position close to the outer peripheral surface of the steel pipe pile, which is a position near the inner periphery of the donut shape of the travel guide plate. How to connect piles.

4. The welding carriage has an outer peripheral guide roller portion separate from the guide roller portion, and the outer peripheral roller of the outer peripheral guide roller portion contacts the donut-shaped outer peripheral position of the traveling guide plate to freely travel. The method for connecting steel pipe piles according to any one of the above 1 to 3.

5. 5. The method for connecting steel pipe piles according to any one of 1 to 4 above, wherein the travel guide plate is a pair of half doughnut-shaped pieces.

6. The installation configuration of the doughnut-shaped travel guide plate is
The L-shaped vertical line portions of each of the plurality of upside-down L-shaped members are attached and fixed to a bendable long strip plate at arbitrary intervals, and the L-shaped horizontal lines of each of the plurality of upside-down L-shaped members are fixed. After winding and fixing the long belt-shaped plate around the outer peripheral surface of the first steel pipe pile so that the part faces outward and maintains horizontality, each L-shaped horizontal line part of a plurality of upside-down L-shaped members A donut-shaped travel guide plate is placed and fixed on the
The method for connecting steel pipe piles according to any one of 1 to 5 above, characterized by:

7. A long strip-shaped plate is wound around the outer peripheral surface of the first steel pipe pile, and a tightening member is further attached to the outer peripheral surface of the long strip-shaped plate or the outer side of the L-shaped vertical line part of the plurality of upside-down L-shaped members. 7. The method for connecting steel pipe piles according to 6 above, wherein the steel pipe pile is wound and fixed by tightening.

8. The installation configuration of the doughnut-shaped travel guide plate is
A plurality of L-shaped steel materials are fixed to the outer peripheral surface of the first steel pipe pile so that each L-shaped horizontal line portion faces outward and maintains horizontality, and a doughnut-shaped travel guide plate is placed on the L-shaped horizontal line portion. be configured to place and fix the
The method for connecting steel pipe piles according to any one of 1 to 7 above, characterized by:

In this specification, the “first steel pipe pile” refers to the steel pipe pile of the lower pile among the two connected steel pipe piles, and the lower end is connected to the upper end of this lower steel pipe pile. The steel pipe pile of the upper pile located above is called the "second steel pipe pile". Therefore, when the next steel pipe pile is connected to the upper part of the second steel pipe pile after the connection of these two piles is completed, the second steel pipe pile is set downward, so it is called the "first steel pipe pile". In other words, the next steel pipe pile becomes the upper pile, so it is called the “second steel pipe pile”.

ADVANTAGE OF THE INVENTION According to the invention shown in Claim 1, it is possible to provide a method for connecting steel pipe piles that allows the welding truck to travel in a stable state and to obtain uniform welding quality.

In particular, since the welding trolley is configured to travel while being magnetically attracted to the outer peripheral surface of the vertical pile pipe due to the magnetic attraction of the wheels formed from magnets, the weight of the welding trolley and the load during travel depend on the travel guide plate. Therefore, there is no need for a high-strength running rail and mounting structure as in Patent Documents 1 to 3 described above.
In addition, by making the rollers of the guide roller part of the welding truck contact the traveling guide plate attached to the outer peripheral surface of the steel pipe pile and making it move freely, the welding line is traced, so that the position of the welding truck is confirmed. Since it can be run accurately, it is possible to obtain accurate and uniform welding quality in a stable state.
Furthermore, since the rollers of the guide roller portion, the traveling guide plate with which the rollers abut, the seams to be welded, and the welding torch portion for welding the seams are close to each other, compared to a configuration in which these positions are far apart. can significantly reduce the deviation of the respective positional accuracies.
Furthermore, since the travel guide plate does not bear the weight of the welding trolley and the load during travel, the configuration of the travel guide plate and the attachment configuration to the steel pipe piles are sufficient with a simple configuration. It is also possible to use easily available and procurable members and remnants at low cost.
Furthermore, since the configuration of the travel guide plate and the configuration of attachment to the steel pipe pile are simple, it is sufficient to complete the welding of the joint between the first steel pipe pile and the second steel pipe pile, and the second steel pipe It becomes easy to relocate the travel guide plate when connecting the next steel pipe pile to the upper part of the pile.

According to the second aspect of the invention, the rollers of the guide roller portion abut on the travel guide plate at two locations, and welding is performed between these two locations. As a result, welding to the seam by the welding torch is stabilized, and stable welding quality can be obtained.

According to the third aspect of the invention, the rollers of the guide roller portion abut against the inner peripheral position of the travel guide plate, so that the welding carriage is close to the joint to be welded, resulting in high positional accuracy with respect to the joint.

According to the fourth aspect of the invention, the traveling position of the welding carriage can be confirmed also from the position of the traveling guide plate in the outer peripheral direction, so that the welding carriage can be made to travel more accurately. Therefore, accurate and uniform welding quality can be obtained in a more stable state.
Furthermore, even if there is a risk of derailment due to a weakening of the magnetic attraction force of the welding carriage due to a decrease in the magnetic force of the magnet, vibration, or other factors, the outer peripheral roller will not move from the outer peripheral position of the travel guide plate to the welding carriage. Since it is in a state where the is supported, it is possible to prevent or suppress derailment.

According to the fifth aspect of the invention, since the travel guide plate is in the shape of a pair of half donuts, it can be formed using a plate material that can be easily obtained and procured at a construction site or the like. be.

According to the sixth aspect of the invention, the travel guide plate is formed using members and offcuts that can be easily obtained and procured at construction sites, such as upside-down L-shaped members and bendable long belt-shaped plates. Therefore, it can be manufactured at low cost and easily.

According to the seventh aspect of the invention, when attaching the travel guide plate to the steel pipe pile, it is possible to use a fastening member such as a chain block that can be easily obtained and procured at a construction site or the like, so that it is low cost and easy. is.

According to the eighth aspect of the invention, the travel guide plate is made of L-shaped steel, which can be easily obtained and procured at a construction site or the like. can be done.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic front view which shows one Example of the connection method of the steel pipe pile which concerns on this invention. Schematic left side view of FIG. Schematic perspective view for explaining the structure of a travel guide plate used in the present invention. Schematic plan view for explaining an example of the installation configuration of the travel guide plate to the steel pipe pile (No. 1) Schematic plan view explaining an example of the installation configuration of the travel guide plate to the steel pipe pile (No. 2) Schematic plan view explaining an example of the installation configuration of the travel guide plate to the steel pipe pile (No. 3) Schematic plan view explaining an example of the installation configuration of the travel guide plate to the steel pipe pile (No. 4) Schematic front view of FIG. Schematic side view for explaining another example of the mounting configuration of the travel guide plate to the steel pipe pile Fig. 10 is a schematic left side view showing another embodiment of the method for connecting steel pipe piles according to the present invention using a welding truck having another configuration;

Next, a method for connecting steel pipe piles according to the present invention will be described in detail with reference to the accompanying drawings.

In the method for connecting steel pipe piles of the present invention, when proceeding with burying construction while longitudinally joining a plurality of steel pipes by welding in burying construction of vertical pile piping, etc., the upper end of the first steel pipe pile that becomes the lower pile and the upper The lower end of the second steel pipe pile that will be the pile is butted against each other, and the joint, which is the butted portion, is circumferentially welded. This circumferential welding is performed using various welding devices, but in the present invention, the welding carriage is configured to travel in the circumferential direction along the outer peripheral surface of the steel pipe pile in the vicinity of the joint.

As a specific configuration of the steel pipe pile connection method of the present invention, as shown in FIGS. 1 and 2,
In the configuration in which the joint 3 between the first steel pipe pile 1 and the second steel pipe pile 2 connected on the first steel pipe pile 1 is welded by the welding carriage 4,
A doughnut-shaped travel guide plate 5 is horizontally attached over the entire circumference so as to surround the outer periphery of the upper end portion of the first steel pipe pile 1 near the lower portion of the joint 3,
A welding carriage 4 having the following configuration is caused to travel in the circumferential direction on the outer peripheral surface of the second steel pipe pile 2 above the joint 3 while being magnetically attracted to the outer peripheral surface, and on the upper surface of the travel guide plate 5 Welding by running the welding carriage while checking the position by contacting the roller of the guide roller part,
is the main configuration.

The welding trolley 4 is composed mainly of magnets, and has a plurality of wheel portions 41 that run and rotate while being magnetically attracted to the outer peripheral surface of the second steel pipe pile 2 by the magnets, and a plurality of wheel portions 41 that run on the wheel portions 41. A drive mechanism (not shown) for rotation, a welding torch portion 42 for welding the seam 3 which is a welding portion, and a guide roller portion for following the welding line by bringing a roller 43A that freely travels into contact with the traveling guide plate 5. 43, and when the joint 3 is welded, it is configured to run on the outer peripheral surface of the second steel pipe pile 2 in the circumferential direction.

The welding carriage 4 is used, for example, for welding the joints 3 of the steel pipe piles 1 and 2 generally having a diameter of about 90 cm as the steel pipe piles 1 and 2. Specifically, the weight is about 5 kg, Preferably, it has a traction force of about 11 kg, a body size of about 250 mm in width, about 200 mm in length, about 230 mm in height, and a running speed of about 100 to 550 mm/min. Various power cords and the like connected to the welding carriage 4 are omitted in the drawings of this embodiment.

In addition, since the wheel portion 41 is mainly made of a magnet, and the steel pipe piles 1 and 2 are generally made of iron-based steel plates, the number of wheels is six in consideration of running stability and the like. Further, it is preferable that the running surfaces of these six wheels are covered with a rubber-based material.
In the case of the welding trolley 4 of this embodiment having the configuration described above, the attracting force of the magnet of the wheel portion 41 for magnetically attracting the steel pipe pile 2 is the sum of the plurality (six in this embodiment) of the wheel portions 41. It is preferably about 25 to 30 kg.

The welding torch part 42 is attached to the main body of the welding carriage 4 via an arm or the like so that the angle (horizontal angle, advance angle/retreat angle, etc.) and the distance to the joint 3, which is the welding point, can be adjusted. is preferably These adjustments are made by adjusting the welding torch part 42 according to the distance between the position of the welding carriage 4 magnetically attracted to the steel pipe pile 2 and the position of the joint 3, thereby moving the welding torch part 43 with respect to the joint 3. can be kept in an appropriate and accurate position, so that stable welding quality can be obtained.

In addition, as the welding configuration by the welding torch part 42, a known and commonly used welding method can be used without any particular limitation as a welding means used in this type of steel pipe pile connection method, and among them, general arc welding is preferably used. be able to.

The guide roller portion 43 is provided with two rollers 43A, and these two rollers 43A contact the travel guide plate 5 at two locations spaced apart in the circumferential direction. It is preferable that welding is performed by the welding torch portion 42 at a position between . According to such a configuration, the rollers 43A of the guide roller portion 43 are brought into contact with two points of the travel guide plate 5, and welding is performed between the two points. Therefore, welding to the seam 3 by the welding torch portion 42 is stabilized, and stable welding quality can be obtained.

Further, the contact position of the roller 43A of the guide roller portion 43 with the travel guide plate 5 is a position close to the outer peripheral surface of the first steel pipe pile 1, which is the position near the inner periphery of the donut shape of the travel guide plate 5. Preferably. The specific distance from the outer peripheral surface of the first steel pipe pile 1 to the contact position of the roller 43A is preferably about 3 to 105 mm, more preferably about 5 to 20 mm.

Furthermore, the guide roller portion 43 is arranged to extend the guide roller portion 43 and the outer circumference of the steel pipe pile 2 according to the distance such as the magnetic attraction traveling position of the welding carriage 4 to the steel pipe pile 2, the mounting position of the traveling guide plate 5, and the like. It is preferable that it is attached to the main body of the welding carriage 4 via an arm or the like so that the distance from the plane can be adjusted. With such a configuration, the roller 43A of the guide roller portion 43 can be brought into contact with the upper surface of the travel guide plate 5 in an appropriate and accurate state.

As the welding carriage 4 having the above configuration, for example, a commercially available welding carriage WEL-HANDY COMPACT manufactured by Koike Sanso Kogyo Co., Ltd. can be used as it is or by partially modifying it. In this embodiment, the number of wheels of the wheel portion 41 mainly formed of magnets is increased from four to two to make a total of six, thereby increasing the magnetic attraction force by 1.5 times and It has been remodeled to reduce the risk of derailment by changing from four to six.
Furthermore, the two additional wheel portions 41 are added at a position further away from the joint 3 than the two wheel portions 41 on the side away from the joint 3 among the original four wheel portions 41, so welding Since the increased magnetic attracting force is exerted at a position farther from the seam 3 which becomes hot due to the welding, it is possible to significantly prevent the decrease in magnetic force due to the heat effect during welding. Therefore, the welding carriage 4 can be made to travel in a more stable state magnetically attracted to the outer peripheral surface of the steel pipe pile 2 .

Next, a description will be given of the traveling guide plate 5 that follows the welding line by contacting the rollers 43A of the guide roller portion 43 of the welding carriage 4 while freely traveling.

As shown in FIGS. 6 and 7, the travel guide plate 5 preferably has a pair of half doughnut-shaped pieces. The traveling guide plate 5 is attached over the entire circumference so as to surround the outer periphery of the portion near the upper end of the first steel pipe pile 1 by the guide plate attachment member 6 shown in FIGS. As the travel guide plate 5, it is preferable to use plate materials that can be easily obtained at construction sites or the like, particularly kohan, which are members and offcuts that can be easily obtained at construction sites, because of low cost.

As shown in FIG. 3, the guide plate mounting member 6 is attached to a long belt-like plate 62 capable of bending vertical line portions 61A of each of a plurality of (eight in this embodiment) L-shaped members 61. It is fixedly mounted at intervals (equal intervals in this embodiment), and as shown in FIGS. 4 and 5, horizontal line portions 61B of each of the plurality of upside-down L-shaped members 61 face outward and maintain horizontality. After winding the long belt-shaped plate 62 around the outer peripheral surface of the first steel pipe pile 1 and fixing it, as shown in FIGS. A doughnut-shaped traveling guide plate 5 is placed and fixed on 61B.
With the guide mounting member 6 mounted and fixed to the first steel pipe pile 1 and the travel guide plate 5 placed, the level is checked with a level and if it is not level, the mounting position of the guide mounting member 6 to adjust.

As the upside-down L-shaped member 61 that constitutes the guide plate mounting member 6, it is possible to use a steel material generally used in this type of steel material construction site or the like, or a scrap material of the steel material, so that it is extremely easy to obtain.・Since it can be procured, it can be manufactured easily at low cost. Further, the upside down L-shaped member 6 is not limited to an integrally molded structure, and may be formed by two members such as a flat bar (flat plate) attached with an angle or the like to form an L shape.
For the long belt-shaped plate 62 as well, since it is possible to use steel materials and scraps of steel materials that are generally used at steel construction sites of this type, etc., it is extremely easy to obtain and procure, so low cost and easy can be manufactured to

As means for fixing the vertical line portion 61A to the elongated belt-like plate 62, various means such as welding, engagement, clamping, bolting, and adhesion can be used, but welding is preferable.
As means for fixing the travel guide plate 5 placed on the horizontal line portion 61B, various means such as welding, engagement, clamping, bolting, and adhesion can be used, but welding is preferable.

In order to wind and fix the long belt-shaped plate 62 around the outer peripheral surface of the first steel pipe pile 1, fixing means such as welding can be used. After connecting the lower end, it is not only necessary to remove it, but if the connection continues, such as connecting the lower end of the next steel pipe pile (not shown) to the upper end of the second steel pipe pile 2, it can be reused immediately. In order to make it possible, after the long belt-shaped plate 62 is wound around the outer peripheral surface of the first steel pipe pile 1, a plurality of upside-down L-shaped members 61 L It is preferable to wrap a tightening member 7 such as a chain block around the outer side of the vertical line portion 61A and tighten and fix it using a jack or the like. The tightening member 7 such as a chain block can be fastened and fixed easily and firmly, and can be easily removed.
Incidentally, the position where the tightening member 7 is wound may be the outer peripheral surface of the elongated belt-shaped plate 62 .

The welding carriage 4 having the above configuration is caused to travel in the circumferential direction on the outer peripheral surface of the second steel pipe pile 2 above the joint 3 while being magnetically attracted to the outer peripheral surface, and the upper surface of the travel guide plate 5 having the above configuration. According to the configuration in which the roller 43A of the guide roller portion 43 is brought into contact with the roller 43A of the guide roller portion 43 to perform welding while following the weld line, the welding carriage 4 travels in a state of being magnetically attracted to the outer peripheral surface of the second standing pile pipe 2 by magnetic attraction. Therefore, the weight of the welding carriage 4 and the load during travel are not applied to the travel guide plate 5, so the high-strength travel rail and the strength No high running rail mounting configuration is required.

In addition, by making the roller 43A of the guide roller portion 43 of the welding carriage 4 come into contact with the travel guide plate 5 attached to the outer peripheral surface of the first steel pipe pile 1 and cause it to travel freely, the weld line is traced. Since the traveling carriage 4 can be accurately traveled while checking the position of the travel locus, it is possible to obtain accurate and uniform welding quality in a stable state.

Further, the roller 43A of the guide roller portion 43, the travel guide plate 5 with which the roller 43A abuts, the seam 3 to be welded, and the welding torch portion 42 for welding the seam 3 are close to each other. The variation in positional accuracy of each can be significantly reduced compared to the distant configuration.

Furthermore, since the travel guide plate 5 is not subjected to the weight of the welding carriage 4 and the load during travel, a simple configuration of the travel guide plate 4 and the attachment configuration to the first steel pipe pile 1 are sufficient. Therefore, it is possible to use members and remnants that can be easily obtained and procured at construction sites or the like at low cost.
Furthermore, since the configuration of the traveling guide plate 5 and the configuration of attachment to the first steel pipe pile 1 are simple, it is sufficient to weld the joint 3 between the first steel pipe pile 1 and the second steel pipe pile 2. is completed, it becomes easy to move the travel guide plate 5 when connecting the next steel pipe pile.

When connecting steel pipe piles by the connection method of the present invention having the above-described configuration, there is a gap inside the joint 3 between the first steel pipe pile 1 and the second steel pipe pile 2 in order to prevent misalignment of the connection. As a preliminary preparation for welding a backing material such as an annular steel plate in advance, or for producing a weld back-beam at the joint 3 of the joint 3 between the upper end of the first steel pipe pile 1 and the lower end of the second steel pipe pile 2 In this type of connection method of steel pipe piles, there are no special restrictions on other work processes known and used in this type of steel pipe pile connection method, such as pulling a plate for the gap interval of the joint 3 and temporarily welding it, and then removing this plate. It goes without saying that this is also used in inventions.

As mentioned above, although the Example of the connection method of the steel pipe pile which concerns on this invention was described, this invention is not limited to the said structure, but can also take another aspect within the scope of this invention.

For example, the mounting structure of the donut-shaped travel guide plate 5 is not limited to the structure of the above-described embodiment, and as shown in FIG. In addition, it is fixed to the outer peripheral surface of the first steel pipe pile 1 through a temporary projection member 64 so as to maintain horizontality, and a doughnut-shaped travel guide plate is placed and fixed on the L-shaped horizontal line portion 63B. You can also
According to such a configuration, the traveling guide plate 5 is formed using the L-shaped steel material 63, which is a member and offcuts that can be easily obtained and procured at a construction site or the like, so that it can be manufactured easily at a low cost. .
In addition, it is preferable that one sheet of L-shaped horizontal line portion 63B is supported in a state of straddling the lower part of the butted portion of the circumferential direction end portions of the two travel guide plates 5 .

In addition, as shown in FIG. 10, the welding carriage 4 has an outer peripheral guide roller portion 44 separate from the guide roller portion 43, and the outer peripheral roller 44A of the outer peripheral guide roller portion 44 serves as a doughnut-shaped outer peripheral portion of the traveling guide plate 5. It is also possible to adopt a configuration in which it abuts on the directional position and moves freely.
According to such a configuration, the traveling position of the welding carriage 4 can be confirmed also from the position of the traveling guide plate 5 in the outer peripheral direction, so that the welding carriage 4 can be caused to travel more accurately. Therefore, accurate and uniform welding quality can be obtained in a more stable state.
Furthermore, even if there is a risk of derailment due to a weakening of the magnetic attraction force of the welding carriage 4 due to a decrease in the magnetic force of the magnets constituting the wheel portion 41, vibration during running, or other factors, the travel guide plate Since the welding carriage 4 is supported by the outer peripheral guide roller portion 44 from the position 5 in the outer peripheral direction, it is possible to prevent or suppress derailment.

1 First steel pipe pile 2 Second steel pipe pile 3 Joint 4 Welding truck 41 Wheel part 42 Welding torch part 43 Guide roller part 43A Roller 44 Peripheral guide roller part 44A Peripheral roller 5 Travel guide plate 6 Guide plate mounting member 61 Upside down L-shaped member 61A Vertical line portion 61B Horizontal line portion 62 Long strip plate 63 L-shaped steel material 63B Horizontal line portion 64 Temporary projecting member 7 Tightening member such as chain block

Claims (8)

A steel pipe pile that welds a joint between a first steel pipe pile and a second steel pipe pile that is connected to the top of the first steel pipe pile using a welding device that moves circumferentially around the outer circumference of the steel pipe pile. In connection method,
A donut-shaped travel guide plate is horizontally attached over the entire circumference so as to surround the outer periphery of the portion near the upper end of the first steel pipe pile that is near the bottom of the joint,
A welding carriage having the following configuration is caused to travel in the circumferential direction on the outer peripheral surface of the second steel pipe pile above the joint while being magnetically attracted to the outer peripheral surface, and a guide roller portion is provided on the upper surface of the travel guide plate. Welding by running the welding carriage while checking the position by contacting the roller,
A method for connecting steel pipe piles.
"Construction of Welding Cart"
A plurality of wheel portions which are mainly formed of magnets and which run and rotate while being magnetically attracted to the outer peripheral surface of the second steel pipe pile by the magnets, a driving mechanism for running and rotating the wheel portions, and a joint which is a welding point. and a guide roller portion for following the weld line by contacting a roller that freely travels against the travel guide plate. Two rollers are provided, and these two rollers are configured to contact the travel guide plate at two locations spaced apart in the circumferential direction, and welding is performed by the welding torch portion at the position between the two locations where the rollers contact. The method for connecting steel pipe piles according to claim 1, wherein the configuration is such that 3. The position of contact of the roller with the travel guide plate is a position close to the outer peripheral surface of the steel pipe pile, which is a position near the inner periphery of the donut shape of the travel guide plate, according to claim 1 or 2. How to connect steel pipe piles. The welding carriage has an outer peripheral guide roller portion separate from the guide roller portion, and the outer peripheral roller of the outer peripheral guide roller portion contacts the donut-shaped outer peripheral position of the traveling guide plate to freely travel. The method for connecting steel pipe piles according to any one of claims 1 to 3. The method for connecting steel pipe piles according to any one of claims 1 to 4, wherein the travel guide plate is a pair of half donut-shaped plates. The installation configuration of the doughnut-shaped travel guide plate is
The L-shaped vertical line portions of each of the plurality of upside-down L-shaped members are attached and fixed to a bendable long strip plate at arbitrary intervals, and the L-shaped horizontal lines of each of the plurality of upside-down L-shaped members are fixed. After winding and fixing the long belt-shaped plate around the outer peripheral surface of the first steel pipe pile so that the part faces outward and maintains horizontality, each L-shaped horizontal line part of a plurality of upside-down L-shaped members A donut-shaped travel guide plate is placed and fixed on the
The method for connecting steel pipe piles according to any one of claims 1 to 5, characterized by: A long strip-shaped plate is wound around the outer peripheral surface of the first steel pipe pile, and a tightening member is further attached to the outer peripheral surface of the long strip-shaped plate or the outer side of the L-shaped vertical line part of the plurality of upside-down L-shaped members. 7. The method for connecting steel pipe piles according to claim 6, wherein the steel pipe pile is wound and fixed by tightening. The installation configuration of the doughnut-shaped travel guide plate is
A plurality of L-shaped steel materials are fixed to the outer peripheral surface of the first steel pipe pile so that each L-shaped horizontal line portion faces outward and maintains horizontality, and a doughnut-shaped travel guide plate is placed on the L-shaped horizontal line portion. be configured to place and fix the
The method for connecting steel pipe piles according to any one of claims 1 to 7, characterized by:

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