JP2006144415A - Steel pipe pile joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steel pipe pile joint capable of exhibiting strong drag to twisting force as well as bending force compared with a conventional one. <P>SOLUTION: The steel pipe pile joint for connecting the rear end of a first steel pipe pile to the front end of a second steel pipe pile is provided with an outer joint pipe with the one-end side inner peripheral surface fixed beforehand to the front end outer peripheral surface of the second steel pipe pile by welding and with the other end side having a sleeve part into which the rear end part of the first steel pipe pile is inserted along the inner peripheral surface; two pairs of through holes provided in the respectively facing positions in two directions orthogonally to each other in the radial direction of the outer joint pipe; two pairs of through holes of the same shape formed in the respective positions coinciding with the two pairs of through holes of the outer joint pipe in the inserted state of the first steel pipe pile into the sleeve; and two pairs of washer members fitted into the respective through holes of the outer joint pipe and first steel pile in the vertically overlapping coincident state to regulate the mutual axial movement of the joint pipe and steel pipe pile. The respectively opposed washer members of the two pairs of washer members are fixed in cross shape to each other by one or more through bolts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steel pipe pile joint that can be used, for example, in a rotary boring device for soil sampling.

  In recent years, when a building is constructed on soft ground such as a landfill site, the number of cases in which steel pipe piles are buried deeply and foundation reinforcement is increasing. This steel pipe pile can be lengthened by adding and can cope with a long depth.

  As an actual steel pipe pile construction method, a pile hole is dug in the ground with a rotary boring device or the like, and a steel pipe pile of a predetermined length is inserted into the pile hole while being added at the construction site. This addition was performed by connecting the ends of steel pipe piles by welding, but the welding work at the site takes time and the excavation work is delayed, so it is easier to connect the steel pipe without welding at the construction site. Steel pipe pile joints that can add piles are increasingly used.

As this steel pipe pile joint, the structure of pin-fixing the edge parts of a steel pipe pile via a joint pipe is mentioned. For example, when the inner joint pipe fixed to the end of one steel pipe pile and the outer joint pipe fixed to the end of the other steel pipe pile are overlapped, the pin insertion holes formed in both are matched. There are some which connect steel pipe piles by inserting a fixing pin into an insertion hole. When the steel pipe pile is raised, there is a pipe that connects two steel pipe piles by connecting the joint pipes fixed to the end of the other steel pipe pile by pin fixing (for example, see Patent Document 1).
JP 2001-11850 A

  The steel pipe pile as described above is required to have strong resistance against external force at the joint part due to problems such as earthquake resistance. However, in the conventional joint as described above, the resistance against the bending force is large due to the overlapping portion of the joint pipes, whereas the connection between them depends only on the fixing pin where the twist stress tends to concentrate. The resistance against the twisting force is relatively weak at the pin fixing portion.

  In view of the above problems, an object of the present invention is to provide a steel pipe joint that can exert stronger resistance against twisting force as well as bending force than in the past.

  In order to achieve the above object, a steel pipe pile joint according to the first aspect of the present invention is a steel pipe pile joint that connects the rear end of the first steel pipe pile and the front end of the second steel pipe pile, and has an inner peripheral surface on one end side. Is an outer joint pipe having a sleeve portion which is welded and fixed in advance to the outer periphery of the front end of the second steel pipe pile and into which the rear end portion of the first steel pipe pile is inserted along the inner peripheral surface on the other end side. And two pairs of through-holes provided at opposing positions in two directions orthogonal to the radial direction of the outer joint pipe, and the outer side of the first steel pipe pile inserted into the sleeve portion. Two pairs of through-holes of the same shape formed at positions overlapping with the two pairs of through-holes of the joint pipe, and the respective penetrations of the outer joint pipe and the first steel pipe pile in a mating state overlapping each other vertically Two pairs of washer members that fit into the holes and restrict the axial movement of the joint pipe and the steel pipe pile. Et two pairs of washer member is to washer member facing each other each of which is fixed in a cross shape in one or more through bolts.

  A steel pipe pile joint according to a second aspect of the present invention is the steel pipe pile joint according to the second aspect, wherein the washer member has a long shape extending in the axial direction of the steel pipe pile, and two or more through bolts The members facing each other are fixed together.

  In the present invention, the rear end of the first steel pipe pile is inserted into a sleeve portion provided on the other end side of the outer joint pipe whose inner peripheral surface on one end side is welded and fixed in advance to the outer periphery of the front end of the second steel pipe pile. In the inserted state of the pair of through-holes provided at the two opposing positions in the two directions perpendicular to the radial direction of the joint pipe of the sleeve portion and the sleeve portion of the first steel pipe pile, A washer member is fitted into each through-hole in a fitting state in which two pairs of through-holes of the same shape formed at each corresponding position overlapping with the two pairs of through-holes overlap each other, and the washers face each other. Since the addition of the first and second steel pipe piles is completed by fixing the members in a cross shape with one or more through bolts, the sleeve part and the rear end of the first steel pipe pile are completed at the joint part. The overlapping area with the part provides sufficient anti-bending force and at the same time two pairs There is an effect that the conventional obtained also strong anti-twisting force that can not be obtained by the configuration for fixing the cross-shaped with a bolt through the gold members together.

  The steel pipe pile joint of the present invention is welded and fixed in advance to the outer periphery of the front end of the second steel pipe pile on the inner peripheral surface on one end side of the outer joint pipe having the sleeve portion on the other end side. The rear end of the first steel pipe pile is inserted into the sleeve part, and the sleeve part and the rear end of the first steel pipe pile are fixed with a washer member and a through bolt. Further, this washer member corresponds to the two pairs of through holes provided at the respective opposing positions in the two directions orthogonal to the radial direction of the outer joint pipe, and the insertion state of the first steel pipe pile in the sleeve portion. The through hole formed at the position is fitted in the fitting hole made up of each of the upper and lower through holes in a mated state where they overlap each other, and the axial movement of the steel pipe piles is restricted, and one or more The washer members facing each other with the through bolts are fixed in a cross shape, and the addition of the first steel pipe resistance and the second steel pipe resistance is completed.

  According to such a steel pipe joint of the present invention, on the construction site, the outer side fixed in advance to the front end of the second steel pipe hole so that the through holes respectively corresponding to the rear end of the first steel pipe pile overlap each other. It is possible to connect the first and second steel pipe piles in a short time by a simple operation of fitting the sleeve portion of the joint pipe, fitting the washer members into these through holes, and fixing the opposing washer members with bolts. In addition, when an external force is applied to each joint portion, a strong resistance is exerted in the overlapping region of the sleeve portion against the bending force, and at the same time, at two opposing positions perpendicular to the joint pipe radial direction. The concentration of twisting stress can be better dispersed by one or more through bolts that fix the washer members in a cross shape, and a strong anti-twisting force is exhibited.

  In the steel pipe joint according to the present invention, if two pairs of washer members are fixed in a cross shape with at least one through bolt, a sufficiently strong anti-twisting force can be exhibited compared to the conventional case, but a stronger anti-bending force. When it is desired to obtain, it is desirable that the washer member and each through hole have a long shape extending in the steel pipe pile axial direction. In this case, if each washer member is fixed with two or more through bolts along the longitudinal direction according to its long shape, a stronger anti-twisting force can be obtained.

  Note that the two pairs of washer members are fixed in a cross shape orthogonal to each other in the radial direction by through bolts inserted into bolt insertion holes formed in the washer member. The bolt end that passes through one of the opposing washer members can be fastened with a nut on the other washer member side, but the through bolts that intersect in the joint pipe between the orthogonal pairs are set at positions that do not interfere with each other. Since there is a need, the two pairs of washer members used in one joint become two sets of two types in which the positions of the bolt insertion holes are different between each pair.

  The steel pipe pile joint according to the present invention is used when a predetermined number of steel pipe piles are sequentially added according to the desired embedding depth. What is necessary is just to prepare in common what the outer joint pipe in which the through-hole was formed in the position was fixed by welding, and the through-hole was formed in the position corresponding to a front-end part.

  Also, depending on the method of embedding steel pipe piles, usually by rotary bowling, the next steel pipe pile may be added to the slowly rotating steel pipe pile, and the sleeve part is fitted to the rear end of the steel pipe pile. Therefore, the diameters of the inner periphery of the sleeve portion and the outer periphery of the rear end of the first steel pipe pile can be relatively easily moved relative to each other around the axis. It is desirable to have a slight dimensional difference.

  Further, the rear end portion of the first steel pipe pile and the sleeve portion on the second steel pipe pile side, for example, the sleeve portion at a predetermined position with respect to each other so that the positioning can be easily completed in a short time. Positioning means may be provided for forming each of the concaves and convexes and the rail structure to be fitted with the insertion.

  As a steel pipe pile joint according to one embodiment of the present invention, FIG. 1 shows a case where a washer member having an elongated shape extending in the axial direction and fixed by two through bolts is used. Fig.1 (a) is a schematic diagram explaining each component site | part of this steel pipe pile joint in the state before the joint of the 1st and 2nd steel pipe pile, (b) is the addition of the 1st and 2nd steel pipe pile. It is a schematic longitudinal cross-sectional view which shows this steel pipe joint in the completion state.

  This steel pipe pile joint 1 is for connecting the front end of the second steel pipe pile 30 to be added to the rear end thereof to the first steel pipe pile 20 previously inserted into the pile hole. The first steel pipe pile 20 and the second steel pipe pile 30 have a common configuration and are sequentially added. Accordingly, in each of the plurality of steel pipe piles prepared at the construction site, the outer joint pipe 2 is welded and fixed to the outer periphery of the front end in advance at the inner peripheral surface of the one end side, and the other end side sleeve part 3 of the outer joint pipe 2 is secured to the rear end part. It becomes the insertion part 4 inserted in the inside.

  The sleeve portion 3 of the outer joint pipe 2 is fitted with a washer member (10a, 10b, 13a, 13b) having a long shape, which will be described later, at predetermined positions facing each other in two directions perpendicular to the joint pipe radial direction. Two pairs of through-holes (5a, 5b and 6a, 6b) are formed.

  On the other hand, the insertion portion 4 of the first steel pipe pile 20 is in the corresponding position overlapping with the two pairs of through holes (5a, 5b and 6a, 6b) of the outer joint pipe 2 in the inserted state in the sleeve portion 3. Two pairs of through-holes (7a, 7b and 8a, 8b) having the same shape are formed, and the corresponding through-holes are arranged vertically when the rear end portion of the first steel pipe pile 20 is inserted into the sleeve portion 3. In a matched state overlapping with each other, two pairs, a total of four fitting holes 9 for fitting the washer members (10a, 10b, 13a, 13b) are obtained.

  By fitting the washer members (10a, 10b, 13a, 13b) into the two pairs of fitting holes 9, the relative movement in the axial direction of the first steel pipe pile 20 and the second steel pipe pile 30 is restricted. The first steel pipe pile 20 and the third steel pipe pile are formed by fixing the two pairs of washer members (10a and 10b, 13a and 13b) facing each other in a cross shape with two through bolts 12 each. 30 is completed.

  Each washer member (10a, 10b and 13a, 13b) is formed with a bolt insertion hole (11, 14) for passing the through bolt 12 and fastening with a nut, but between the two pairs of washer members, The positions of the bolt insertion holes (11, 14) are set so that the positions of the bolt insertion holes (11, 14) can be shifted in the joint pipe radial direction so that the through bolts 12 can cross each other without interfering with each other in the joint pipe.

  In the steel pipe pile joint 1 according to the present embodiment as described above, the second through-holes corresponding to the insertion portions 4 provided at the rear end portion of the first steel pipe pile 20 overlap each other at the construction site. The sleeve portion 3 of the outer joint pipe 2 fixed in advance to the front end of the steel pipe hole 30 is fitted, and the washer members (10a, 10b and 13a, 13b) corresponding to the fitting holes 9 consisting of the through-holes overlapping these upper and lower are fitted. The first and second steel pipe piles (20, 30) can be successively added in a short time by a simple operation that does not require welding in the field of fixing the opposing washer members with the bolts 12 together. it can.

  At the same time, when an external force is applied to each joint portion, a strong resistance is exerted in the overlapping region of the sleeve portion 3 against the bending force, and at the same time, the two opposing directions perpendicular to each other in the radial direction of the joint pipe 3 are provided. The through bolts 12 that fix the washer members in a cross shape at each position can disperse the concentration of twisting stress well and exert a strong anti-twisting force. Since the washer member has a long shape extending in the axial direction of the steel pipe pile, the washer member has a stronger anti-bending force, and the opposing washer members are fixed in a cross shape by two through bolts 12 respectively. Thus, the twisting stress can be better dispersed and the anti-twisting force can be exhibited.

  Further, the steel pipe pile joint of the present invention is not necessarily limited to the configuration in which the long washer members as described above are fixed with a plurality of through bolts, and may sufficiently satisfy the required strength. For example, the structure which fixes washer members which oppose with one through bolt may be sufficient. An example of such a configuration is as shown in FIG.

  That is, a circular washer member 37 having a bolt insertion hole 38 at the center, for example, which is not a long shape, is placed on the outer periphery of the front end of the insertion portion 24 and the second steel pipe pile 31 formed from the rear end portion of the first steel pipe pile 21. Two pairs of circular through-holes (35, 36 and 27, 28) facing each other in two directions perpendicular to the joint pipe radial direction formed in the sleeve portion 33 of the outer joint pipe 32 fixed by welding are mutually corresponding penetrations. The holes are fitted in fitting holes 29 obtained in a matching state in which the holes overlap each other, and the circular washer members 27 facing each other with a single through bolt 39 are fixed in a cross shape.

  In this case, by shifting the positions of two pairs of circular through holes (35, 36 and 27, 28) orthogonal to each other in the joint pipe axis direction, the shape of the through hole and the washer member 37 and the position of the bolt insertion hole 38 are the same. Can be common.

  In addition, in the steel pipe pile joint of the present invention, various shapes can be adopted as the shape of the washer member and the through hole as long as it is not difficult to manufacture, and the number of through bolts and bolt insertion ports is three or more. This is also conceivable, and is not particularly limited to the configuration shown in the above embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the steel pipe pile joint by one Example of this invention, (a) is a schematic diagram explaining each structure site | part of this steel pipe pile joint in the state before the 1st and 2nd steel pipe pile joint, (B) is a schematic longitudinal cross-sectional view which shows this steel pipe joint in the completion state of the addition of the 1st and 2nd steel pipe pile. The steel pipe pile joint at the time of using the washer member of the shape different from FIG. 1 is shown, (a) is a schematic diagram explaining each component part of this steel pipe pile joint in the state before the joint of the 1st and 2nd steel pipe pile (B) is a schematic longitudinal cross-sectional view which shows this steel pipe joint in the completion completion of the addition of the 1st and 2nd steel pipe pile.

Explanation of symbols

1: Steel pipe pile joint 2, 32: Outer joint pipe 3, 33: Sleeve part 4, 24: Insertion part (rear end part of first steel pipe pile)
5a, 5b, 6a, 6b: Through-hole (sleeve-side elongated shape)
7a, 7b, 8a, 8b: Through-hole (insertion side long shape)
9, 29: fitting holes 10a, 10b, 13a, 13b: washers (long shape)
11, 14: Bolt insertion hole 12: Through bolt 20, 21: First steel pipe pile 27, 28: Circular through hole (insertion portion side)
30, 31: Second steel pipe pile 35, 36: Circular through hole (sleeve side)
37: Circular washer member

Claims (2)

In the steel pipe pile joint that connects the rear end of the first steel pipe pile and the front end of the second steel pipe pile,
One end side inner peripheral surface is previously welded and fixed to the front end outer periphery of the second steel pipe pile, and the other end side has a sleeve portion into which the rear end portion of the first steel pipe pile is inserted along the inner peripheral surface. An outer fitting tube,
Two pairs of through holes provided at opposing positions in two directions perpendicular to the radial direction of the outer joint pipe;
Two pairs of through-holes of the same shape formed at each position overlapping the two pairs of through-holes of the outer joint pipe in the state of insertion into the sleeve portion of the first steel pipe pile;
Two pairs of washer members for fitting in the respective through-holes of the outer joint pipe and the first steel pipe pile, which are in a matched state overlapping each other, and restricting axial movement of the joint pipe and the steel pipe pile; With
These two pairs of washer members are steel pipe pile joints in which the facing washer members are fixed in a cross shape with one or more through bolts.   2. The steel pipe pile joint according to claim 1, wherein the washer member has a long shape extending in the axial direction of the steel pipe pile, and opposite members are fixed by two or more through bolts.

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