JP5658096B2 - Pile structure and its construction method - Google Patents

Description

  The present invention relates to a pile structure and a construction method thereof.

  Conventionally, as described in the following Patent Document 1, as a technique in such a field, a jig having a plurality of guide members capable of penetrating a pile and a connecting member disposed between the guide members, A pile structure for connecting piles with this jig is known. In this pile structure, a jig is buried in advance and the pile is inserted into a guide member of the jig, thereby positioning the pile.

  Moreover, as described in Patent Document 2 below, a pile structure is known that includes a plurality of hollow steel pipes and a connecting material that connects the steel pipes, and a pile is inserted into the steel pipe. In this pile structure, a block body constituted by four steel pipes is installed at a breakage point of a river embankment and the block body is supported by inserting the pile into the steel pipe. Further, a concave portion is provided in the vertical direction on the side surface of the steel pipe, and a water shielding plate is attached to the concave portion.

JP 2007-170076 A Japanese Patent Laid-Open No. 2000-144677

  In the pile structure described in Patent Document 1 described above, a jig is embedded in the ground in order to determine the placement position of the pile, and in the pile structure described in Patent Document 2, a block body installed in advance. In order to support the pile, the pile is inserted into the steel pipe. Thus, the jig or the block body is not provided for the purpose of reinforcing the pile. Therefore, the strength as a pile structure was insufficient. Moreover, when installing a jig and a block body beforehand, since the construction precision is calculated | required, the excavation work was inevitably required.

  An object of the present invention is to provide a pile structure that does not require excavation work and can secure sufficient strength, and a method for constructing the pile structure.

Pile structure according to the present invention is a pile structure formed by connecting a plurality of piles each other provided in the ground, a plurality of piles are parallel to each other, it is buried in the ground with two of the plurality of piles and a connector for connecting the piles to each other, coupling includes a coupling part two piles are connected to the two cylindrical portions of penetrations, respectively it, two cylindrical portions, A plurality of connecting tools are used, the plurality of piles are respectively penetrating through the plurality of cylindrical portions, and the plurality of cylindrical portions are respectively coupled to the plurality of piles. Features.

According to this pile structure, a plurality of piles parallel to each other are connected by a connector embedded in the ground. Here, the plurality of cylindrical portions of the coupler are respectively coupled to the plurality of piles. Therefore, sufficient strength can be secured as a pile structure. Also, at the time of construction, after laying a plurality of piles in the ground, it is only necessary to embed the connecting tool so that these piles penetrate through the cylindrical portion, so that excavation work is required for burying the connecting tool. There is no need for excavation work.
Moreover, the space | interval holding | maintenance part for making a cylindrical part and the centerline of a pile correspond may be provided in the inner surface of the cylindrical part.
Further, the lower end of the connecting portion may be tapered.
Moreover, the lower end of the cylindrical part may be tapered.

  Here, a plurality of connecting tools are provided, and the connecting portions of the connecting tools are rectangular plates extending in parallel to the axes of the plurality of cylindrical portions, and the plurality of connecting portions are close to each other in the axial direction. It is good also as the aspect arrange | positioned. In this case, the earth retaining wall can be formed by the rectangular plate-like connecting plates arranged close to each other. Thus, a connection part can be utilized also as a sheet pile.

  Moreover, a connection part is good also as an aspect which can be expanded-contracted in the direction which several piles space apart. In this case, even if there is a slight construction error in the plurality of piles, the plurality of piles can be penetrated through the tubular portion by slightly expanding and contracting the connecting portion in the direction in which the piles are separated from each other. The connection tool is buried without hindrance. Therefore, the workability is improved.

  The method for constructing a pile structure according to the present invention is a method for constructing a pile structure in which a plurality of piles provided in parallel to each other in the ground are connected to each other, and includes a plurality of tubular portions and a plurality of tubular portions. In a state where a plurality of piles provided in the ground penetrate each of a plurality of cylindrical portions of a connector having a connection portion that connects each other, a step of pushing the connector into the ground, and a plurality of piles And a step of coupling a plurality of cylindrical portions to each other.

  According to this method for constructing a pile structure, the connector is pushed into the ground in a state where a plurality of piles provided parallel to each other in the ground have penetrated the tubular portion of the connector. Therefore, there is no need for excavation work for burying the coupler, and excavation work is not necessary. Furthermore, since the several cylindrical part of the coupling tool pushed in in the ground is respectively couple | bonded with respect to several piles, the intensity | strength as a pile structure is fully securable.

  ADVANTAGE OF THE INVENTION According to this invention, when installing the coupling tool for improving the intensity | strength and rigidity of a pile structure, excavation work is unnecessary and it can ensure sufficient intensity | strength.

It is a perspective view showing a 1st embodiment of a pile structure concerning the present invention. It is a perspective view which shows the coupling tool in FIG. It is sectional drawing perpendicular | vertical to the axial direction of a pile. (A)-(c) is a figure which shows the various forms of the expansion-contraction mechanism of a connection part. It is a figure which shows the construction method of the pile structure of FIG. (A) And (b) is sectional drawing which shows the coupling | bonding method of the cylindrical part with respect to a pile, (c)-(f) is a figure which shows the various forms of the grout filling bag. It is a perspective view of the tunnel to which 2nd Embodiment of a pile structure is applied. (A) is a figure which shows the coupling tool used for the pile structure of FIG. 7, (b)-(d) is a figure which shows the construction procedure of the tunnel of FIG. It is a perspective view of a box culvert to which a third embodiment of a pile structure is applied. (A)-(c) is a figure which shows the construction procedure of the box culvert of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[First Embodiment]
As shown in FIG. 1, the pile structure 1 is a structure serving as a foundation for supporting pillars and the like constructed on the ground in a viaduct provided for a structure such as a railway or a road structure. The pile structure 1 is constructed in the ground. Illustrations of ground structures and pillars are omitted.

  The pile structure 1 includes a plurality of circular piles 2 provided in the ground, and connectors 3 and 4 that connect the plurality of piles 2 to each other. The pile structure 1 is a pile underground connection structure including a pile 2 and connecting tools 3 and 4 as underground beams. The pile structure 1 has a configuration that allows construction with minimum construction restrictions even when there is a structure in service on the ground. Specifically, the construction can be performed without any trouble even when the railway line in business is elevated. The pile structure 1 is a structure that is excellent in workability and can construct underground beams at low cost.

  The plurality of piles 2 are straight piles arranged in the vertical direction D1 and extending substantially parallel to each other. The axis L1 of each pile 2 extends in the vertical direction D1. The plurality of piles 2 are arranged in a lattice shape in plan view, for example. The pile 2 is made of concrete. As the pile 2, for example, a prestressed high-strength concrete (PHC) pile or a cast-in-place pile can be applied. If the pile 2 is a PHC pile, the surface is smooth and the diameter is relatively small, which is suitable.

  In addition, the pile 2 is not restricted to the case made from concrete, For example, a steel pipe can also be applied. The pile 2 may be a cast-in-place pile using a steel pipe. Concretely, after inserting the steel pipe, the concrete is cast to make the surface cylindrical, and the steel pipe is installed as a mouth pipe (or stand pipe) to prevent the collapse of the sediment at the hole during excavation. The structure which left the steel pipe after casting may be sufficient.

  The connecting tools 3 and 4 as underground beams connect the piles 2 by connecting both ends in the horizontal direction to the two piles 2. Each of the couplers 3 and 4 extends in the horizontal direction and functions as a horizontal beam. In the example shown in FIG. 1, the direction in which the connector 3 is arranged and the direction in which the connector 4 is arranged are orthogonal to each other.

  The connector 3 includes two cylindrical sockets (cylindrical portions) 6 and 6 through which each of the two piles 2 penetrates, and a thin plate-like connecting plate (connecting portion) 7 that connects the sockets 6 and 6 together. have. The connector 4 includes two cylindrical sockets (cylindrical portions) 8 and 8 through which each of the two piles 2 penetrates, and a thin plate-like connecting plate (connecting portion) that connects the sockets 8 and 8 together. 9. The connector 3 and the connector 4 are alternately attached so as to overlap in the vertical direction D <b> 1, and one stake 2 passes through the socket 8 of the connector 4 and the socket 6 of the connector 3 alternately. doing.

  The socket 6 of the connector 3 is arranged such that its axis L2 (see FIG. 2) substantially coincides with the axis L1 of the pile 2. Further, the socket 6 is coupled to the pile 2 via a mortar 12 (see FIG. 3) or the like. In the same manner, the socket 8 of the connector 4 is arranged so that the axis thereof substantially coincides with the axis L1 of the pile 2 and is coupled to the pile 2 via a mortar or the like. The piles 2 and the connecting plates 7 and 9 are rigidly connected by these sockets 6 and 8.

  As described above, the couplers 3 and 4 have a so-called G-shaped joint structure in which the beams are joined to the two piles 2 and 2 in one horizontal direction. In other words, each of the couplers 3 and 4 has two rating points at both ends in the horizontal direction. In addition to the G-shaped joint structure, the cruciform joint structure is a cross-shaped joint structure in which beams are joined in two horizontal directions, or a beam is joined in three or four directions. There is a bonded structure. Thus, although it can also be set as the structure which has a beam (connection part) extended in two or more directions per connection tool, from the viewpoint of the simplification of a structure and workability, it is one like connection tools 3 and 4. A configuration having beams (connecting portions) only in the direction is preferable.

  The connection plate 7 of the connector 3 extends along a vertical plane including the axes L1 and L1 of the piles 2 and 2 at both ends. In the same manner, the connecting plate 9 of the connecting tool 4 extends along a vertical plane including the axes L1 and L1 of the piles 2 and 2 at both ends. In other words, the connecting plates 7 and 9 extend in the direction in which the piles 2 are separated from each other (the direction between the supports) and in the vertical direction. The connecting plates 7 and 9 have a thin plate shape having a long cross section in the vertical direction, thereby resisting an external force acting in the direction of each support. In the pile structure 1, the angle formed by the connection plate 7 of the connection tool 3 and the connection plate 9 of the connection tool 4 is 90 degrees. Even so, the rigidity is maintained. In the present embodiment, the case where the angle formed by the connecting plate 7 and the connecting plate 9 is 90 degrees is described. However, a plurality of piles are arranged in a staggered manner in a plan view, and the plurality of connecting plates form a triangular shape. Even when piles are connected to each other, rigidity is maintained against external forces in all directions.

  At the tip, that is, the lower end of each pile 2, a spherical rooting portion 11 for increasing the supporting force is formed. These root hardening parts 11 are formed by injection | pouring of cement milk etc.

  Hereinafter, the connectors 3 and 4 will be described more specifically. Since the sockets 6 and 8 have the same configuration, the socket 6 will be described in the following description. The socket 6 is made of, for example, ultra high-strength fiber reinforced concrete (UFC) reinforced with high-strength spiral reinforcing bars. The socket 6 may be made of a steel pipe or UFC that does not include a reinforcing bar. The socket 6 has strength and rigidity capable of transmitting the cross-sectional force (such as bending moment, shearing force, and axial force) of the connecting plate 7 to the pile 2. As shown in FIG. 2, the lower end portion 6a of the socket 6 has a tapered shape in which the outer diameter is reduced and the thickness is reduced toward the lower side. The socket 6 having such a configuration is configured to reduce press-fit resistance during construction. The socket 6 is not limited to a cylindrical shape, and may have a square, polygonal, or circular cross section, or a water droplet shape with a part of the circumference sharpened.

  As shown in FIG. 3, the inner diameter of the socket 6 is larger than the diameter of the pile 2. A cylindrical space is formed between the socket 6 and the pile 2, and the mortar 12 is filled in the space. Four flat bars 13 are secured to the inner peripheral surface of the socket 6 to maintain a distance from the surface of the pile 2. The flat bar 13 is for making the axis L2 of the socket 6 substantially coincide with the axis L1 of the pile 2, that is, for arranging the socket 6 concentrically with the pile 2. The flat bar 13 extends in the direction of the axis L2 of the socket 6 (see FIG. 2), and the lower end portion 13a (see FIG. 5) has a taper in which the protruding length from the inner peripheral surface of the socket 6 is shortened downward. It has a shape. When the socket 6 is made of a steel pipe and the connecting plate 7 is made of a steel plate, the flat bar 13 functions as a reinforcing rib against welding of the connecting plate 7 by welding the flat bar 13.

  The connecting plate 7 of the connecting tool 3 is made of UFC, for example. The connecting plate 7 may be made of steel plate, reinforced concrete, or UFC reinforced with reinforcing steel or steel. As shown in FIG. 2, the lower end portion 7 a of the connecting plate 7 has a tapered shape in which the thickness is reduced toward the lower side. In other words, the connecting plate 7 has a shape in which the lower side is sharp like guillotine. As described above, the thin plate-like connecting plate 7 having such a configuration is configured to resist an external force acting in the direction of the support and to reduce press-fit resistance during construction.

  As shown in FIG. 1, the connecting plate 9 of the connector 4 has an expansion / contraction mechanism 10 that can expand and contract in a direction in which the piles 2 and 2 are separated from each other. The telescopic mechanism 10 is configured to transmit a shearing force acting in the vertical direction D1. The connection plate 9 is different from the connection plate 7 of the connection tool 3 in that it has an expansion / contraction mechanism 10, and the material, shape, and the like are the same as those of the connection plate 7. Needless to say, the coupler 3 may be provided with an expansion / contraction mechanism. The expansion / contraction mechanism 10 may be provided as necessary. If unnecessary, the telescopic mechanism 10 can be omitted.

  As shown in FIG. 4A, the connecting plate 9 is divided into two in the horizontal direction D <b> 2, and includes one plate member 14 and the other plate member 15. The plate material 14 and the plate material 15 are abutted and joined in the horizontal direction D2. Tapered comb teeth portions 14b and 15b are provided at the joining end portions of the plate material 14 and the plate material 15. The comb teeth portion 14b and the comb teeth portion 15b are fitted, and the fitting portion is surrounded by a cylindrical member 16 made of, for example, a steel plate. A gap between the cylindrical member 16, the comb tooth portion 14b, and the comb tooth portion 15b is filled with cement grout injected from the ground via the hose 17. The tubular member 16 prevents the transmission of the shearing force due to the displacement of the tapered comb-tooth portions 14b and 15b in the vertical direction D1 when a shearing force is applied to the plate members 14 and 15. Yes. Desirably, sponge rubber or the like for preventing leakage of cement grout is appropriately disposed between the cylindrical member 16 and the comb teeth portions 14b and 15b.

  The comb-tooth portion 14b and the comb-tooth portion 15b are fitted with some play and can be expanded and contracted in the horizontal direction D2 when the cement grout is not filled during construction. The expansion and contraction mechanism 10 is constituted by the comb teeth portions 14b and 15b forming such a comb tooth structure. According to the expansion and contraction mechanism 10, even when the construction error of the piles 2 occurs, that is, when the piles 2 are slightly inclined to the letter C or the reverse letter C, the piles 2 can be formed without any trouble. On the other hand, the connector 4 can be attached. In other words, the construction error of the pile 2 can be absorbed by the expansion / contraction mechanism 10. In addition, it is good also as a comb-tooth part with fixed width instead of a taper shape.

  As the expansion / contraction mechanism, in addition to the expansion / contraction mechanism 10 described above, various modifications can be employed. For example, as shown in FIG. 4B, a pentagonal columnar convex portion 18b protruding in the horizontal direction D2 is provided at the tip of one of the two divided plate members 18, and a convex portion is provided at the tip of the other plate member 19. You may provide the pentagonal columnar recessed part 19b in which 18b is inserted. By the convex portion 18b and the concave portion 19b forming such a tenon structure, an expansion / contraction mechanism 10A that can expand and contract in the horizontal direction D2 can be configured.

  Further, as shown in FIG. 4 (c), a thin plate portion 20b having a half plate thickness is provided at the tip of one of the two divided plate members 20, and the plate thickness is halved at the tip of the other plate member 21. The thin plate portion 21b may be provided, and the thin plate portion 20b and the thin plate portion 21b may be overlapped in the thickness direction. Further, the thin plate portions 20b and 21b are penetrated in the thickness direction, and the long holes 20c and 21c are formed in the thin plate portions 20b and 21b in the horizontal direction D2, and the pins 22 are inserted into the portions where the long holes 20c and 21c communicate with each other. It is good also as composition to do. The elongated holes 20c and 21c and the pins 22 can constitute an expansion / contraction mechanism 10B that can expand and contract in the horizontal direction D2.

  Although not shown in the drawings, in the telescopic mechanism 10A and the telescopic mechanism 10B, as in the telescopic mechanism 10, a tubular member 16 and a hose 17 are provided, and cement grout is injected into the tubular member 16 from the ground. It is desirable to fill the gap between the fitting portions.

  Then, the construction method of the pile structure 1 is demonstrated.

  As shown in FIG. 5, the pile 2 is first placed or constructed in the ground. In addition, this process is abbreviate | omitted when the pile 2 is already provided. Next, the two piles 2 are respectively penetrated through the two sockets 6 of the coupler 3, and the coupler 3 is pushed into the ground with the pile 2 penetrating the socket 6. Here, using the pile 2 already provided in the ground as a guide, the connector 3 is pushed into the ground without requiring excavation work.

  More specifically, reaction force is taken by a reaction force device 25 fixed to the upper end of the pile 2, and the upper end is fixed to the reaction force device 25 and is connected by two hydraulic jacks 23 installed on both sides of the pile 2. The tool 3 is press-fitted downward in the vertical direction D1. Here, the lower press-fit steel pipe 24A, the intermediate press-fit steel pipe 24B, and the upper press-fit steel pipe 24C are appropriately added in the vertical direction D1 depending on the depth at which the connector 3 is buried. Bolts or the like are provided between the lower press-fit steel pipe 24A and the intermediate press-fit steel pipe 24B, and between the intermediate press-fit steel pipe 24B and the upper press-fit steel pipe 24C, and the steel pipes are joined together. The lower end of the lower press-fit steel pipe 24 </ b> A and the upper end of the socket 6 are not coupled to each other and are brought into pressure contact with each other.

  In the process of press-fitting the connector 3, high-pressure water is injected from the tip 26a through the press-fit hose 26 extending from the ground to the vicinity of the lower end 6a of the socket 6, thereby disturbing the ground near the lower end 6a. , Facilitating the setting of the connector 3.

Here, since the lower end portion 6a of the socket 6 and the lower end portion 7a of the connecting plate 7 are tapered as described above, the press-fit resistance of the connecting tool 3 is reduced. These lower end portions 6a and 7a constitute press-fit resistance reducing means. Moreover, since the lower end part 13a of the flat bar 13 has a tapered shape, the pile 2 is prevented from being damaged when the connector 3 is press-fitted.

  When the connector 3 is press-fitted into a predetermined position, high-pressure water is injected into the socket 6 through the press-fitting hose 26 to clean the outer peripheral surface of the pile 2 and the inner peripheral surface of the socket 6. Furthermore, the mortar is filled in the gap between the pile 2 and the socket 6 through the press-fitting hose 26 and is cured. Thereby, the two sockets 6 are each couple | bonded with respect to the two piles 2, and a score part is formed. The press-fit steel pipes 24A to 24C are drawn out to the ground. In addition, you may provide an unevenness | corrugation in the surface of the pile 2 previously in order to prevent deviation | shift in the perpendicular direction D1.

  The pile structure 1 shown in FIG. 1 is constructed by repeating the press-fitting process and the coupling process in each of the connectors 3 and 4. In embedment of the connector 4, after the connector 4 is press-fitted into a predetermined position, the cement grout is press-fitted into the expansion / contraction mechanism 10 by the hose 17 (see FIG. 4A), and the connector plate 9 is integrated. To do.

  As shown in FIGS. 6 (a) to 6 (c), the grout filling bag 27 may be attached in advance to the inner peripheral surface of the socket 6 when the socket 6 (or the socket 8) is coupled to the pile 2. desirable. Specifically, as shown in FIGS. 6A and 6C, four rectangular plate-shaped grout filling bags 27 are arranged between the flat bars 13, and each grout filling bag 27 A press-fitting hose is connected to each of the injection nozzles 32 attached to the upper end, and after the socket 6 is press-fitted to a predetermined position, grout such as mortar or resin is press-fitted from the ground.

  By sending the grout into the four grout filling bags 27 with equal pressure, a uniform tensile stress is generated in the socket 6 in the circumferential direction as shown in FIG. Produces a uniform compressive stress in the radial direction. Since the material of the pile 2 and the socket 6 is high strength, the pile 2 and the socket 6 can sufficiently withstand the stress generated by the press-fitting of the grout, and the grout is filled in the grout filling bag 27 with a relatively high pressure. Can be sent. By using the grout filling bag 27 in this way, the gap between the pile 2 and the socket 6 can be filled with a hard material, and sufficient rigidity at the point portion can be ensured. Furthermore, cleaning in the socket 6 is not necessary.

  In addition to the four grout filling bags 27 described above, various modifications can be adopted as the grout filling bag. For example, as shown in FIG. 6 (d), a plate-shaped grout filling bag 28 rounded over the entire circumference may be used. This is effective when a flat bar is not attached. Further, as shown in FIG. 6E, a cylindrical grout filling bag 29 may be used. Moreover, as shown in FIG.6 (f), you may use the tube-shaped grout filling bag 31 wound helically. In this case, the flat bar may be spirally welded to the inner peripheral surface of the socket 6. When any of the above grout filling bags is used, since the bag is deflated and thin when the socket 6 is press-fitted, there is no resistance to press-fitting.

  According to the pile structure 1 of this embodiment described above, the plurality of piles 2 parallel to each other are connected by the connecting tools 3 and 4 embedded in the ground, and each of the two sockets 6 of the connecting tools 3 and 4. , 8 are respectively coupled to the two piles 2. Therefore, sufficient strength is secured as a pile structure. Moreover, at the time of construction, after providing the plurality of piles 2 in the ground, it is only necessary to embed the connecting tools 3 and 4 so as to penetrate the sockets 6 and 8. Excavation work is not required for burial, and excavation work is unnecessary.

  Moreover, since the connection tool 4 which has the expansion-contraction mechanism 10 can be expanded-contracted in the direction which several piles 2 space apart, even if it is a case where there is a slight construction error in several piles 2, piles 2 are separated. When the connecting plate 9 slightly expands and contracts in the direction to be connected, the plurality of piles 2 can be passed through the socket 8, and the connecting tool 4 can be buried without any trouble. Thereby, the improvement of workability is achieved.

  Normally, the pillars in the superstructure such as viaducts are arranged on the same plane as the pile 2, so that the inertial force of the superstructure during earthquakes and horizontal forces such as braking loads on vehicles and trains are subject to the bending resistance of the pillars. Is transmitted to the pile structure 1. At this time, the bending moment in the vicinity of the pile head can be relaxed by providing the connectors 3 and 4 as underground beams. By relaxing the bending moment in this way, an increase in pile diameter and an increase in the amount of reinforcing bars can be prevented, and a pile structure 1 that is low in cost and excellent in workability is realized. Moreover, the connection plates 7 and 9 also improve the horizontal rigidity of the entire structure. Furthermore, the connection plates 7 and 9 contribute to the suppression of the uneven settlement of the pile 2.

  Furthermore, according to the construction method of the pile structure 1 of the present embodiment, the plurality of piles 2 provided in parallel with each other in the ground pass through the sockets 6 and 8 of the couplers 3 and 4, Since 4 is pushed into the ground, excavation work for burying the couplers 3 and 4 is unnecessary. Further, since the plurality of sockets 6 and 8 of the couplers 3 and 4 pushed into the ground are respectively coupled to the plurality of piles 2, strength as a pile structure is sufficiently ensured.

  In addition, even when the construction yard is close to the upper structure in service, or when a new structure is constructed immediately above the construction yard, the coupling tool 3 as an underground beam without excavation work. 4 can be provided, so that subsidence and movement of an upper structure such as a railroad track can be suppressed. It can also be built only at night.

  Furthermore, even when the ground stiffness suddenly changes in the vicinity of the boundary between the liquefied layer and the non-liquefied layer, such as during an earthquake, the diameter of the pile can be reduced by providing the connecting tools 3 and 4 as underground beams. You don't have to be thick. Moreover, even if the ground rigidity sudden change portion is deep in the ground, the underground beam can be constructed by press-fitting the connectors 3 and 4.

[Second Embodiment]
FIG. 7 is a perspective view of a tunnel to which the second embodiment of the pile structure is applied. The pile structure 1A of the present embodiment shown in FIG. 7 is different from the pile structure 1 of the first embodiment shown in FIG. 1 in that the tunnel T extends on both the left and right sides of the tunnel T instead of the plurality of piles 2. A point provided with a plurality of piles 40 arranged side by side in the direction D3, and a point provided with a connecting tool 41 serving as an underground beam and a sheet pile instead of the connecting tools 3 and 4.

  In the tunnel T constructed using the pile structure 1A, two pile structures 1A extending in the vertical direction D1 on both the left and right sides of the tunnel T and extending in the extending direction D3 of the tunnel T are constructed. Each pile structure 1A is provided with a bottom plate support bracket 44 and a top plate support bracket 46 that protrude toward the other pile structure 1A facing each other. A bottom plate 47 is placed on the bottom plate support bracket 44, and a top plate 48 is placed on the top plate support bracket 46, and the pile structure 1 </ b> A is positioned between the bottom plate 47 and the top plate 48. A middle pillar 49 is provided. With such a structure, the first space S1 and the second space S2 extending in the extending direction D3 are formed.

  More specifically, as shown to Fig.8 (a), the connection tool 41 of 1 A of pile structures is a thin plate which connects two cylindrical sockets (cylindrical part) 42 and 42, and sockets 42 and 42 mutually. And a connecting plate 43 (connecting portion). The socket 42 is coupled to the pile 40 in the same manner as in the pile structure 1. The connecting plate 43 has a rectangular plate shape, and the length H of the connecting plate 43 in the vertical direction D1, that is, the axial direction D1, is twice the length h of the socket 42 in the axial direction D1. The lower end portion 43a of the connecting plate 43 has a tapered shape with a thickness that is reduced toward the bottom in order to reduce press-fit resistance.

  And as shown in FIG.8 (b), among the several piles 40 arranged in parallel by the extending direction D3, the 1st pile 40 and the 2nd pile 40 adjacent to it are the one connection tool 41 first. By connecting the second pile 40 and the third pile 40 adjacent thereto by another connecting tool 41, the socket 42 of one connecting tool 41 and the socket 42 of the other connecting tool 41 are connected to each other. Are adjacent in the axial direction D1 of the second pile 40 without interfering with each other. By alternately providing one connecting tool 41 and another connecting tool 41 for the first to third piles 40, the sides of the plurality of connecting plates 43 are combined between these piles 40. The connecting plates 43 can be arranged in a staggered manner with no gaps. That is, the plurality of rectangular plate-like connection plates 43 connect the piles 40 to each other and are arranged close to each other in the axial direction D1.

  At the time of construction of the tunnel T, after constructing the pile structures 1A and 1A as shown in FIG. 8 (b), a plurality of connecting plates 43 arranged side by side without any gap between the piles 40 become earth retaining walls, and the pile structure The ground between 1A and 1A can be excavated. Then, as shown in FIGS. 8C and 8D, the bottom plate 47, the top plate 48, and the middle column 49 are sequentially installed to form spaces S1 and S2. In the tunnel T, the pile structures 1A and 1A are used not as temporary structures but as permanent structures. Thereby, rationalization, such as shortening of a construction period and the reduction of temporary members, is achieved. In addition, when the proof strength as a wall member is insufficient only by 1 A of pile structures, a frame can also be constructed inside and it can also be set as a synthetic wall.

  According to the pile structure 1A of the present embodiment, the same effects as the pile structure 1 can be obtained, and the rectangular plate-like connection plates 43 of the connection tool 41 are arranged in close proximity to each other. A retaining wall is formed. Thus, the connection plate 43 can be used not only as a horizontal beam but also as a sheet pile.

[Third Embodiment]
FIG. 9 is a perspective view of a box culvert to which the third embodiment of the pile structure is applied. The pile structure 1B of the present embodiment shown in FIG. 9 is different from the pile structure 1A of the second embodiment shown in FIG. 7 in that the body 54 of the box culvert C is surrounded instead of the plurality of piles 40. A point provided with a plurality of columnar horizontal piles 50 extending in the extending direction D4 of the box culvert C and a point provided with a connector 51 for connecting the horizontal piles 50 in place of the connector 41. The connector 51 has two cylindrical sockets 52 and a rectangular plate-shaped connector plate 53, and has the same configuration as the connector 41 of the pile structure 1A. These couplers 51 also serve as underground beams and sheet piles.

  At the time of construction of the box culvert C, as shown in FIG. 10 (a), a rectangular parallelepiped shaft 60 is first formed in the ground, and then the pile 50 is extended in the extending direction D4 of the box culvert C, for example, horizontally. Is disposed. Here, the horizontal pile 50 is pushed in from the side wall of the vertical shaft 60 toward the ground. Further, as shown in FIG. 10B, in the same manner as the pile structures 1 and 1 </ b> A, the horizontal pile 50 is used as a guide to push in the connecting tool 51, and the horizontal piles 50 are connected by the connecting tool 51. Next, as shown in FIG. 10C, a plurality of connecting plates 53 arranged side by side without any gap between the horizontal piles 50 become earth retaining walls, and the excavation space S <b> 5 surrounded by the horizontal piles 50 can be excavated. it can. And as shown in FIG. 9, the main body 54 of the box culvert C is constructed inside the pile structure 1B, and the first space S3 and the second space S4 are formed. Also in this box culvert C, the pile structure 1B is used not as a temporary structure but as a permanent structure. Thereby, rationalization, such as shortening of a construction period and the reduction of temporary members, is achieved.

  According to the pile structure 1B of the present embodiment, the same effects as the pile structures 1 and 1A can be obtained, and the box culvert C can be constructed by a non-open-cut propulsion method. Even when the pile is provided in a horizontal direction or a direction inclined at a predetermined angle from the horizontal direction, high rigidity can be realized and a retaining wall can be formed and used.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment. For example, in the above-described embodiment, the case where the lower ends of the cylindrical portion and the connecting portion are formed in a tapered shape has been described. However, it may not be formed in a tapered shape. Moreover, a connection part is not restricted to the case where it is plate shape, For example, a cross-sectional circle and a rectangular column shape may be sufficient, and a cylinder shape may be sufficient. Further, the plurality of piles is not limited to being provided in the vertical direction or the horizontal direction, and may be provided in a direction that forms an angle with the vertical direction or the horizontal direction.

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... Pile structure, 2 ... Pile, 3, 4 ... Connection tool, 6, 8 ... Socket (tubular part), 7, 9 ... Connection plate (connection part), 40 ... Pile, 41 ... Connection tool 42 ... Socket (cylindrical part), 43 ... Connecting plate, 50 ... Horizontal pile (pile), 51 ... Connector, 52 ... Socket (cylindrical part), 53 ... Connecting plate, L1 ... Axis of pile, L2 ... Socket axis.

Claims (9)

A pile structure in which a plurality of piles provided in the ground are connected to each other,
The plurality of piles parallel to each other;
A connector that is buried in the ground and connects two piles of the plurality of piles,
The connector comprises two cylindrical portions, wherein the two piles are penetrations, respectively it, and a connecting portion connecting the two cylindrical portions,
A plurality of the connecting tools are used,
Each of the plurality of piles penetrates the plurality of cylindrical portions,
A plurality of said cylindrical parts are respectively couple | bonded with respect to these piles, The pile structure characterized by the above-mentioned.   The pile structure according to claim 1, wherein an interval holding portion is provided on an inner surface of the cylindrical portion so as to match a center line of the cylindrical portion and the pile.   The pile structure according to claim 1 or 2, wherein a lower end of the connecting portion has a tapered shape.   The pile structure according to any one of claims 1 to 3, wherein a lower end of the cylindrical portion has a tapered shape. The connecting portion of the connector with has a rectangular plate shape extending in parallel to a plurality of axes of the tubular portion,
The pile structure according to any one of claims 1 to 4 , wherein the plurality of connecting portions are arranged close to each other in the axial direction. The pile structure according to any one of claims 1 to 5, wherein the connecting portion can be expanded and contracted in a direction in which the plurality of piles are separated from each other. A pile structure in which a plurality of piles provided in the ground are connected to each other,
The plurality of piles parallel to each other;
A connector that is buried in the ground and connects the plurality of piles,
The connector has a plurality of cylindrical portions through which each of the plurality of piles penetrates, and a connecting portion that connects the plurality of cylindrical portions,
The plurality of cylindrical portions are respectively coupled to the plurality of piles,
The connecting portion of the connector is a rectangular plate extending in parallel with the axis of the plurality of cylindrical portions,
Pile structure plurality of the connecting portions, characterized by being disposed close to each other in the axial direction. A pile structure in which a plurality of piles provided in the ground are connected to each other,
The plurality of piles parallel to each other;
A connector that is buried in the ground and connects the plurality of piles,
The connector has a plurality of cylindrical portions through which each of the plurality of piles penetrates, and a connecting portion that connects the plurality of cylindrical portions,
The plurality of cylindrical portions are respectively coupled to the plurality of piles,
The connecting portion, the pile structure you wherein the plurality of piles to each other is extendable in a direction away. A construction method of a pile structure in which a plurality of piles provided in parallel with each other in the ground are connected,
In the state where the plurality of piles provided in the ground have penetrated each of the plurality of tubular portions of the connector having a plurality of tubular portions and a connecting portion that connects the plurality of tubular portions. Pushing the connector into the ground;
Combining the plurality of cylindrical portions with the plurality of piles, respectively.
The construction method of the pile structure characterized by including.

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