JP2007197975A - Structure and method for connecting pile head part and precast girder together - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for connecting a pile head part and a precast girder together, which has good constructibility and high strength, and a method for connecting them together. <P>SOLUTION: A hole 11, which has such a shape as to be widened toward an end, from one side of the precast girder 1 to the other side subject to the insertion of the pile 9, is formed in the place, to which the pile head part 91 is to be connected, of the precast girder 1; the pile head part 91 is loosely fitted into the hole 11; and the precast girder 1 and the pile head part 91 are connected together by means of a filler 8. In this case, a pipe body 2A with an exterior wall surface shape corresponding to the shape of the interior wall surface 11c of the hole 11 is mounted in the hole 11; a dowel bar 3 is mounted on the pipe body 2A; a part 3a protruding to the outside of the dowel bar 3 is embedded in a precast floor slab 1; and a part 3b protruding to the inside of the dowel bar 3 is embedded in the filler 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a connection structure between a pile head and a precast girder and a connection method thereof.

  The connection structure between the pile head and the foundation of the superstructure (girder and floor slab) is roughly divided into rigid and pin connections depending on the degree of fixation. There is also an intermediate bond structure. For example, the rigid coupling structure embeds the pile diameter in the foundation of the upper structure and further strengthens the connection strength by the pile head reinforcing bars embedded in both the pile head and the foundation. When a rigid connection structure is applied, the bending moment generated at the head of the pile is transmitted to the foundation of the superstructure, so the structure of the foundation connected to the pile (such as bar arrangement and foundation thickness) It is necessary to have a structure that can resist the bending moment transmitted from the pile head in addition to the generated bending moment. However, the greatest merit of the rigid coupling structure is that the horizontal displacement of the pile head can be reduced because the pile is firmly bound to the foundation. Therefore, for example, the connection structure between the piles that support one of the infrastructure facilities, such as bridges and bridge girders, and piles is designed / constructed using the rigid connection structure described above in accordance with the Road Bridge Specification (Japan Road Association). Is generally performed.

  On the other hand, the pin coupling structure is an extremely simple connection structure in which, for example, about 10 cm of the pile head is embedded in the foundation. Therefore, the bending moment generated in the pile head is not transmitted to the foundation, and the bending moment is There is no need to design the foundation in consideration of the above. However, even if it is a pin coupling structure, a pile head reinforcing bar may be arranged at the pile head. On the other hand, since the pile head is not firmly restrained by the foundation, there is a demerit that the horizontal displacement of the pile head becomes larger than that of the rigid coupling structure. Therefore, such a pin coupling structure is applied to a structure that does not need to strictly reduce the horizontal displacement of the pile head, such as a general building or a house.

  As mentioned above, when connecting the pile head and the foundation of the superstructure with a rigid connection structure, it is necessary to embed the pile head in the foundation to the extent of the pile diameter and to install a pile head reinforcement . Therefore, it is necessary to avoid the interference between the pile head and the foundation reinforcement. Bending the foundation reinforcement in the interference section or cutting the foundation reinforcement in the interference section so as to surround the pile head. An operation of separately providing reinforcing bars for reinforcing the portion is unavoidable. Furthermore, there is also a concern that the foundation concrete may be poorly wrapped due to a complicated arrangement of bars at the connection between the pile head and the foundation.

  For the above reasons, the workability from the pile construction to the foundation construction is reduced and the construction period is delayed, and the connection between the pile head and the foundation is accompanied by concerns about the quality deterioration of the connection between the pile and the foundation. Improvements in structure and connection methods were sought. As such an improvement technique, a technique for precasting a foundation such as a girder of a superstructure or a floor slab has been applied. In this method, concrete girders and floor slabs are manufactured in advance at a factory or the like (precast girders, precast floor slabs), and precast members are installed on piles already installed in a construction yard.

  By the way, patent document 1 can be mentioned as a prior art regarding the connection structure of a concrete precast member, and a pile head, and its construction method. In this technique, a cylindrical metal plate is embedded in a precast member, and a concrete pile is inserted and installed in the cylindrical metal plate.

On the other hand, there is a structure in which a steel girder and a pile are connected instead of a concrete precast member. For example, Patent Document 2 can be cited as a conventional technique related to the connection structure between the steel girder and the pile head. In this connection structure, a cylindrical pile insertion part is provided at the point of a cross-girder-shaped steel girder, and a steel girder is inserted by inserting a pile into this cylindrical part and filling the cylindrical part with mortar or concrete. And integration with piles.
JP 2003-27418 A JP 2002-146704 A

  According to the connection structure between the precast member and the pile head disclosed in Patent Document 1 and the connection structure between the steel girder and the pile head disclosed in Patent Document 2, after securing sufficient strength in the connection portion The workability can be improved. However, since the hole provided in the precast member into which the pile head is inserted or the hole provided in the steel girder is cylindrical, high positioning accuracy is required when inserting the pile into the cylinder, The actual insertion work is extremely difficult. In order to avoid such difficulties when inserting piles, there is a measure to set the hole diameter inside the cylinder large, but in that case, the amount of filler to be filled in the cylinder will increase, resulting in workability. It also leads to a decline.

  The present invention has been made in view of the above-mentioned problems, has good workability when connecting the precast girder and the pile head, and further, the pile head and the precast girder having a high-strength connection structure. It is an object to provide a connection structure and a connection method thereof.

  In order to achieve the above object, the connection structure between the pile head and the precast girder according to the present invention is a connection structure between the pile head and the concrete precast girder, and the pile head is connected to the precast girder. A hole having a divergent shape is formed from one surface of the precast girder toward the other surface on the side where the pile is inserted, and the pile head is loosely fitted in the hole and a filler. The precast girder and the pile head are connected at.

  The precast girder is made of reinforced concrete or prestressed concrete, and the shape of the girder can be selected from appropriate shapes such as a rectangular or trapezoidal cross section. Further, a state in which a plurality of digits are previously assembled in a well digit may be used. Moreover, the pile used as the object of the connection structure of this invention is the whole piles, such as a steel pipe pile, a PHC pile, a PC pile, a cast-in-place RC pile, and an H steel pile.

  The precast girder has a hole into which the pile head is inserted (freely fitted). The shape of the hole is shaped so as to expand from the upper surface of the precast girder toward the lower surface on the side where the pile is inserted, that is, the size of the hole increases downward. As an embodiment of the shape of the hole, an appropriate shape can be selected as long as the shape is divergent toward the lower surface of the precast girder, such as a truncated cone shape and a truncated pyramid shape. In addition to the form in which the hole penetrates from the upper surface to the lower surface of the precast girder, the upper surface is closed, and a hole having a divergent shape is formed in the middle to the lower surface of the girder. The form which provided the filling port of may be sufficient.

  In a state where the pile head is embedded in a hole having a wide shape at the end of the precast girder, a filling material such as mortar or concrete is filled in the hole, and the pile material and the precast girder Are integrated. In addition, the connection structure of the present invention can be formed by filling / curing the filler after installing the pile head reinforcing bars on the pile head.

  As an advantage that the hole for the pile head loosely fitting formed in the precast girder is not cylindrical, but shaped in a divergent shape from the upper surface to the lower surface of the girder, the strength of the connecting portion is improved, Improvement of workability can be mentioned. Specifically, by making the hole in a divergent shape, the adhesion area between the pile head and the inner wall surface of the hole and the inner wall surface of the hole becomes wider compared to a cylindrical hole, Therefore, the adhesion strength is increased. That is, it is possible to easily increase the adhesion strength depending on the shape of the hole, and it is not necessary to use a high-performance filler having a high adhesion strength. Furthermore, since the inner wall shape of the hole is wedge-shaped in longitudinal section with respect to the punching shear of the pile against vertical load, the fracture line at the time of punching shear and the inner wall line of the hole are orthogonal or substantially orthogonal As a result, the shear strength can be improved.

  In addition, when inserting the pile head into the hole while hanging the precast girder, the initial hole size is relatively large, so it is possible to set a wide tolerance for construction errors during insertion Thus, the workability at the time of pile head insertion construction is greatly improved. In addition, while absorbing the construction error at the time of pile head insertion, the shape of the hole is reduced toward the top, so the pile head is fixed to the predetermined hole of the hole while guiding the pile head on the inner wall surface of the hole. Can be positioned. Therefore, in addition to improving workability, it is possible to ensure high positioning accuracy between the pile head and the hole.

  Moreover, the preferable embodiment of the connection structure between the pile head and the precast girder according to the present invention is the connection structure between the pile head and the precast girder, and the inner wall surface of the hole matches the shape of the inner wall surface. A tubular body having an outer wall surface shape is attached, a first convex portion is formed on the outer wall surface of the tubular body, and a second convex portion is formed on the inner wall surface of the tubular body, The first convex portion is embedded in the inner wall surface of the hole of the precast girder.

  In the connection structure of the present invention, the strength of the connection portion is further increased by reinforcing the hole with a tubular body having an outer wall surface shape that matches the shape of the inner wall surface of the hole formed in the precast girder. Here, a steel pipe can be used, for example.

  Protrusions having an appropriate shape are attached to the outer wall surface and the inner wall surface of the tube. The convex portion provided on the outer wall surface is integrated with the precast girder while being embedded in the concrete of the precast girder. On the other hand, the convex portion provided on the inner wall surface of the tubular body increases its connection strength when the filler and the tubular body are integrated after the pile head is loosely fitted inside the tubular body. It leads to.

  Here, as the shape of the convex portion, a gibber line can be used. The connection strength can be further increased by using a stud gibber with a head as the gibber muscle. The gibber is fixed to the inner and outer wall surfaces of the pipe by welding, etc., and when producing the precast girder, the concrete is placed with the pipe installed in the hole position. Integrate the tube. Moreover, the method of screwing the gibber muscle where the thread groove was cut into the bolt hole drilled previously may be sufficient.

  Further, as the shape of the convex portion, it is possible to apply a form in which a plurality of ring-shaped steel bars are attached to the inner and outer wall surfaces of the tubular body at intervals, or a form in which one continuous steel bar is helically attached to the wall surface. .

  Furthermore, as a more preferred embodiment, the connection strength of the connecting portion is further increased by attaching the above-mentioned gibel muscles and spiral or ring-shaped protrusions to the outer wall surface of the pile head loosely fitted in the hole. It becomes possible. Here, when the applied pile is, for example, a steel pipe pile, a plurality of bolt holes are drilled in the pile head of the steel pipe pile, and after the pile head is installed in the hole of the precast girder, It is also possible to fill / cure the filler by screwing or fitting bolts or dowel bars.

  After forming the connection structure between the precast girder and the pile head described above, an appropriate superstructure is constructed on the precast girder (for example, a precast girder assembled in a cross girder shape). The connection structure between the superstructure and the precast girder is preferably bolted via an anchor plate. The structure of the superstructure is arbitrary, such as a building, a condominium, a water and sewage facility, and a bridge abutment.

  As described above, according to the connection structure between the pile head and the precast girder of the present invention, and the structure including such a connection structure, the connection strength of the connection structure is significantly increased as compared with the conventional connection structure. In addition, the workability can be improved and the construction period can be shortened.

  In addition, as another embodiment, there is a connection structure between a pile head and a steel girder formed like a cross girder. The steel pipe into which the pile is inserted is attached to the grade point of this well, and the shape of at least the inner wall surface of the steel pipe is formed in a divergent shape from the upper end toward the lower end on the side where the pile is inserted. The pile head is loosely fitted in the steel pipe, and the precast girder and the pile head are connected by a filler.

  Even in the above-described form, the inner wall shape of the steel pipe into which the pile head is loosely fitted is a shape that spreads downward toward the bottom, so that the workability can be improved and the strength of the connecting portion can be increased as described above. It is.

  In the above connection structure, a plurality of steel girders are assembled in a cross-girder shape, and after pile heads are loosely fitted in the respective steel pipes provided at the respective points, the filling material is filled / filled in the respective steel pipes. Cured to form a connection structure. As described above, since the size of the hole below the steel pipe is set to be large, some steel pipes and pile heads are also used when loosely fitting multiple pile heads to the steel pipes of each grade of the cross beam. It is possible to extremely reduce the possibility that the part may interfere and become loosely fitted.

  Further, on the inner wall surface of the steel pipe, a convex portion protruding into the steel pipe can be formed. As the form of the convex portion, the above-described gibber streaks, ring-shaped or spiral streaks (bars), etc. is there.

  As still another embodiment, there is a connection structure between a pile head and a precast floor slab. In this mode, among the precast floor slabs, at a plurality of locations to which the pile heads are connected, holes having a divergent shape similar to the above are formed from one side of the precast floor slab toward the other side where the pile is inserted. The pile heads corresponding to the respective holes are loosely fitted, and the precast floor slab and the pile heads of the plurality of piles are connected by the filler.

  Furthermore, the method for connecting the pile head and the precast girder according to the present invention is that the precast girder is connected to the pile head from one side of the precast girder to the other side on the side where the pile is inserted. A method of connecting a pile head and a precast girder, in which a hole having a divergent shape is formed toward the first step, the first step of installing the pile on the target ground, and a pile receiving material for receiving the precast girder A second step of installing on the head, a third step of placing the lower surface of the precast girder on the receiving material while loosely fitting the pile head into the hole of the precast girder, and a pile head on the receiving material It comprises a fourth step of attaching the convex portion to the first portion and a fifth step of filling the inside of the hole with a filler.

  When the pile head is loosely fitted in the hole of the precast girder with the convex portion attached in advance to the pile head, the convex portion becomes an obstacle and the workability is lowered. Later, a receiving material is attached to the pile head, the pile head is loosely fitted in the hole of the precast girder, and the precast girder is placed on the receiving material. After that, for example, an operator enters the hole, attaches the receiving material as a scaffold, attaches appropriate convex parts such as gibber bars and bolts to the outer wall surface and inner / outer wall surface of the pile head, and then fills the hole with filler / It is to be cured.

  According to the construction method of the present invention, it is possible to construct a connection structure with good workability, because the hole for pile head loose fitting formed in the precast girder has a diverging shape downward.

  As can be understood from the above description, according to the connection structure between the pile head and the precast girder of the present invention, and the connection method thereof, the hole into which the pile head is loosely fitted has a divergent shape from the upper surface toward the lower surface. By being molded, it is possible to widen the construction tolerance when loosely fitting the pile head into the hole, and the loosely fitted pile head is above the hole along the inner wall surface of the hole. Since it is guided, in addition to improving workability, positioning accuracy between the hole and the pile head can be improved. Moreover, according to the connection structure of the pile head of the present invention and the precast girder, and its connection method, the pile head and the foundation (precast girder), such as the punching shear strength of the pile and the adhesion strength with the pile head, etc. The connection strength can be increased.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a structure having a connection structure between a pile head and a precast girder according to the present invention, and FIG. 2 is a view taken along arrow II-II in FIG. ing. 3 to 5 are perspective views showing an embodiment of the tubular body, and FIG. 6 is a cross section of another embodiment of a connection structure between a pile head having the tubular body of FIG. 3 and a precast girder. Each figure is shown. FIG. 7 is a perspective view showing an embodiment of a connection structure between a pile head and a precast floor slab, and FIG. 8 shows an embodiment of a connection structure between the pile head and a steel girder. Each perspective view is shown. The illustrated structure is a bridge supported by a steel pipe pile, but the structure having a connection structure between the pile head of the present invention and a precast girder is not limited to the illustrated embodiment. Of course. Moreover, the applied pile is not limited to the illustrated steel pipe pile, and other specifications such as PHC pile, PC pile, H steel pile, cast-in-place RC pile are also objects of the present invention. Of course.

  FIG. 1 shows that a plurality of concrete precast girders 1, 1,... Supported by steel pipe piles 9, 9 are arranged in the longitudinal direction of the bridge, and an upper girder A is installed between the precast girders 1, 1. Further, a structure 100 is shown in which a roadway B made of concrete or asphalt having a predetermined road structure above the upper beam A or a combination thereof is provided. Here, the pile head 91 of the steel pipe pile 9 is loosely fitted in the hole 11 formed in the precast girder 1, and the pile 8 is filled / cured in the hole 11, whereby the pile head A connection structure 10 between 91 and the precast girder 1 is formed.

  The construction method of installing steel pipe piles 9, 9, ... in the river can be carried out by towing the steel pipe piles and using a hoist ship for driving the piles, extending a temporary jetty from both sides of the river, and piles from above the jetty Can also be placed.

  2 is a view taken in the direction of arrows II-II in FIG. The connection structure 10 between the pile head 91 and the precast girder 1 shown in the figure is a structure of a connection portion between one concrete precast girder 1 and the pile heads 91 and 91 of the two steel pipe piles 9 and 9. . This precast girder 1 is formed with two holes 11, 11 for loosely fitting the pile heads in a divergent shape from the upper surface to the lower surface of the precast girder 1 at two locations where the pile heads 91, 91 are connected. . The hole 11 includes an upper opening 11a, a lower opening 11b, and a truncated conical inner wall surface 11c. On the other hand, a steel receiving material 92 for receiving the precast girder 1 is attached to the pile head 91 of the steel pipe pile 9 that is loosely fitted in the hole 11, and the pile head 91 above the receiving material 92 is attached. , A plurality of gibber muscles 93, 93,... Are attached. As a method for attaching the gibber bar 93, there is a method in which a through hole (not shown) is drilled in the pile head 91 in advance, and the diver bar 91 is fitted into this hole. The gibber muscle 91 may be a headed gibber muscle (not shown). In a state where the pile head 91 is loosely fitted into the hole 11 by a predetermined length, for example, about the pile diameter, the filler 8 such as mortar, concrete, and resin is filled / cured from the upper opening 11a. A partition plate 94 for the filler 8 is attached inside the steel pipe pile 9.

  Here, the shape of the inner wall surface of the hole 11 and its dimensions can be set as appropriate according to the diameter of the pile head 91, the embedding length, construction tolerance, and the like. For example, when the pile head 91 is loosely fitted in the hole 11, it is essential that a gap that can be filled with the filler 8 is formed between the upper end of the pile head 91 and the inner wall surface 11 c of the hole 11. In addition, it is necessary to set the dimensions such that the dowel bar 93 attached to the pile head 91 does not interfere with the inner wall surface 11c. Moreover, when the pile head 91 is loosely fitted in the hole 11, the size of the lower opening 11 b is preferably set to a size that does not impair the workability. Further, the line of the inner wall surface 11c having a divergent shape is an angle orthogonal to the shear fracture line when the pile head 91 is punched and sheared, for example, when the shear fracture line is 45 degrees, the line of the inner wall surface 11c is also By setting to about 45 degrees, the shear strength during punching shear can be further increased.

  In the illustrated embodiment, the upper opening 11a is provided. However, the upper surface of the precast beam 1 may have a shape in which only a relatively small opening for filling the filler 8 is perforated.

  3 to 5 show embodiments of hollow, frustoconical tubular bodies, each having an outer surface shape coinciding with the inner wall surface 11c of the hole 11 of the precast girder 1. Each tubular body can be formed of, for example, a steel material.

  The tube 2A shown in FIG. 3 is attached to the side wall so that the dowels 3, 3,... Protrude from the inner and outer walls of the wall, and the portion 3a protruding from the outer wall surface is in the hole 11 of the precast girder 1. It has an effect of increasing the connection strength between the tubular body 2A and the precast beam 1. On the other hand, the portion 3b protruding from the inner wall surface has an effect of increasing the adhesion strength (connection strength) between the filler 8 filled therein and the tube body 2A.

  On the other hand, a tubular body 2B shown in FIG. 4 has a plurality of ring-shaped steel bars 4a,... 4b,. As with the pipe body 2A, the steel bar 4a attached to the outer wall surface is embedded in the precast girder 1, and the steel bar 4b attached to the inner wall surface increases the connection strength with the filler 8. .

  Further, the tubular body 2C shown in FIG. 5 has helical steel bars 5a,..., 5b,.

  FIG. 6 shows a connecting structure 10A between the precast girder 1 and the pile head, in which the tubular body 2A is integrally attached to the hole 11 among the tubular bodies described above. An outer projecting portion 3 a of the gibber muscle 3 attached to the tube body 2 A is embedded in the precast beam 1, and an inner projecting portion 3 b is embedded in the filler 8 filled in the hole 11. By adopting such a configuration, all of the connection strength between the pile head 91 and the filler 8, the connection strength between the filler 8 and the tubular body 2A, and the connection strength between the tubular body 2A and the precast girder 1 are obtained. As a result, the connection strength of the connection structure 10A between the pile head 91 and the precast girder 1 can be increased.

Next, the construction method of the connection structure of the above-mentioned pile head and the precast girder will be outlined.
First, a predetermined number of steel pipe piles (here, two steel pipe piles for one precast girder) are installed at predetermined positions on the target ground. As for the installation method of steel pipe piles, a known construction method such as a driving method, an embedding method, a digging method or the like can be applied in consideration of the ground characteristics of the target ground and the influence on the surrounding environment.

  When the installation of the steel pipe pile is completed, next, a receiving material for receiving the precast girder is installed at a predetermined position (level) of the pile head. The receiving material is preferably attached after the pile installation is completed. When installing the receiving material, if the pile is installed on the opposite shore, build a scaffold and the worker drops the receiving material having an opening from the top of the pile head on the scaffold and welds it at a predetermined position. There is a method in which a ring-shaped receiving material is prepared, and the ends are welded so as to coincide with each other on the pile peripheral surface and are also attached by welding to the pile peripheral surface. On the other hand, when installing the receiving material on the pile standing on the river, it can be installed using a work boat or a jetty extending from the riverbank.

  After installing the receiving material on the pile head, the lower surface of the precast beam is placed on the receiving material while loosely fitting the pile head into the hole of the precast beam. In this work as well, when installing a precast girder on a pile installed on the opposite shore, a method of installing a crane boom from the ground and hanging the precast girder from the tip of the boom, and a temporary pier were constructed. If there is, there is a method of hanging a precast girder from a crane on the pier.

  After temporarily placing the precast girder on the receiving material, this time the worker enters the hole in the precast girder and attaches the gibber bar to the pile head. A hole for penetrating the gibber muscle is drilled in the pile head in advance, the gibber muscle is penetrated through this hole, and if necessary, the pile head and the gibber muscle are welded, or both When the thread groove is cut, the installation work of the gibber is performed by screwing the gibber into the hole.

  After the installation of the gibber bar is completed, a filler is filled into the hole from the upper opening of the hole, and the connection structure is completed after the hardening is completed.

According to the construction method of the present invention, the lower opening area of the hole for the pile head loose fitting formed in the precast girder is set wide, and therefore the pile head is loosely fitted in the hole formed in the precast girder. The tolerance for construction is widened. On the other hand, since the cross-sectional dimension of the inner wall surface of the hole becomes smaller upward, the upper end of the pile head is positioned with high accuracy at a predetermined level after being guided by the inner wall surface of the hole, and therefore high. Workability can be realized.

  FIG. 7 is a view showing a connection structure 10 </ b> B between the pile head 91 and the precast floor slab 6. The pile heads 91, 91,... Of, for example, four steel pipe piles 9, 9,... Installed in advance on the target ground are loosely fitted into the diverging holes 61, 61,. Then, similarly to the case of the precast girder described, the connecting structure 10B is formed by filling / curing the filler 8 inside. Of course, an embodiment in which a tubular body as shown in FIGS. 3 to 5 is integrally embedded in the hole 61 may be used. On the precast floor slab 6, an arbitrary structure such as a building or various public facilities is constructed.

  On the other hand, FIG. 8 shows a steel pipe 2D attached to each grade of a steel well 7 in which steel girders 71, 71,. The connection structure 10C formed by loosely fitting is shown. The steel girder 71 can be a hollow square steel pipe or H-shaped steel, or a form in which concrete is filled in the square steel pipe. .. Are attached to the inner wall surface of the tubular body 2D, and the filler 8 is filled / cured therein. The filler 8 is filled from the filling port 2D1 at the top of the tube body 2D. An appropriate structure is also constructed on the steel well 7.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

The side view which showed one Embodiment of the structure provided with the connection structure of the pile head and precast girder of this invention. II-II arrow line view of FIG. The perspective view which showed one Embodiment of the tubular body. The perspective view which showed other embodiment of the tubular body. The perspective view which showed other embodiment of the tubular body. Sectional drawing of other embodiment of the connection structure of the pile head provided with the pipe body of FIG. 3, and a precast girder. The perspective view which showed one Embodiment of the connection structure of a pile head and a precast floor slab. The perspective view which showed one Embodiment of the connection structure of a pile head and a steel girder.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Precast girder, 11 ... Hole, 11a ... Upper surface, 11b ... Lower surface, 11c ... Inner wall surface, 2A, 2B, 2C ... Tubular body, 3 ... Givel bar, 4a, 4b ... Ring-shaped steel bar, 5a, 5b ... Spiral Steel bar, 6 ... Precast slab, 7 ... Steel well girder, 71 ... Steel girder, 8 ... Filler, 9 ... Steel pipe pile, 10, 10A, 10B, 10C ... Connection structure, 100 ... Structure

Claims (6)

It is a connection structure between a pile head and a concrete precast girder,
Of the precast girders, a hole having a diverging shape is formed from one surface of the precast girders toward the other surface on the side where the piles are inserted, at a place where the pile head is connected. A connection structure between a pile head and a precast girder, wherein the pile head is loosely fitted and the precast girder and the pile head are connected by a filler. In the connection structure of the pile head according to claim 1 and the precast girder,
A tubular body having an outer wall surface shape that matches the shape of the inner wall surface is attached to the inner wall surface of the hole, and a first convex portion is formed on the outer wall surface of the tubular body. A connection structure between a pile head and a precast girder, characterized in that a second convex part is formed on the inner wall surface, and the first convex part is embedded in the inner wall surface of the hole of the precast girder .   The connection structure between a pile head and a precast girder according to claim 2, wherein the convex portion is a gibber line.   The connection structure between a pile head and a precast girder according to claim 2, wherein the convex portion is formed in a ring shape or a spiral shape on a wall surface of the tubular body.   5. A connection structure between a pile head and a precast girder according to any one of claims 1 to 4, wherein a convex portion is formed on at least an outer wall surface of the pile head inserted into the hole. In the connection method between the pile head and the precast girder, the precast girder is connected to the pile head at the location where the pile head is connected from one side of the precast girder toward the other side where the pile is inserted. Is a method of connecting the pile head and the precast girder,
A first step of installing the pile on the target ground, a second step of installing a receiving material for receiving the precast girder on the pile head, and the precast girder while loosely fitting the pile head into the hole of the precast girder A third step of placing the lower surface of the pile on the receiving material, a fourth step of attaching a convex portion to the pile head on the receiving material, a fifth step of filling the inside of the hole with a filling material, A method of connecting a pile head and a precast girder characterized by comprising:

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