JP3850765B2 - Steel pipe pile burial method and steel pipe pile body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel pipe pile embedding method in which a steel pipe pile inserted and arranged in a pile hole in the ground is embedded by consolidation of a consolidated material filled in the pile hole, and the steel pipe pile body.
[0002]
[Prior art]
As a method of embedding and fixing a steel pipe pile as a kind of ready-made pile used for foundation work of a building in a pile hole in the ground, a solidified material filled in the pile hole, for example, grout such as cement milk It is generally known that materials are consolidated together around a steel pipe pile.
[0003]
By the way, the load acting on this type of steel pipe pile mainly includes indentation load, horizontal load, and pull-out load, and the supporting force for these loads is the adhesion force of the consolidated material adhering around the steel pipe pile. Depends mainly on. However, since the outer peripheral surface of a general steel pipe pile is smooth and the frictional force generated there is small, the adhesion of the consolidated material to the steel pipe pile can be achieved by simply consolidating the consolidated material around the steel pipe pile. In other words, sufficient support for steel pipe piles cannot be ensured.
[0004]
In view of this, usually, the steel pipe pile peripheral surface is subjected to processing for increasing the frictional force, and the support force in the ground is strengthened under the increased adhesion of the consolidated material.
[0005]
[Problems to be solved by the invention]
Examples of the process for increasing the adhesion of the consolidated material to the steel pipe pile include, for example, a plurality of reinforcing bars wound in the circumferential direction at spaced positions and fixed, or a single reinforcing bar wound in a spiral shape. And the like that are fixed by the above are known. However, since the welding operation in the circumferential direction is likely to be complicated and the work efficiency is poor, an increase in cost due to the processing itself is inevitable.
[0006]
Moreover, in a well-known construction method, the horizontal supporting force in the steel pipe pile is obtained by filling the consolidated material over almost the entire length of the pile hole and solidifying it around the entire length of the steel pipe pile. However, in such a configuration, since it is necessary to perform an adhesion strengthening process on the entire length of the steel pipe pile, the amount of expensive steel pipe pile used increases, and from this point, the cost increases. .
[0007]
An object of the present invention is to provide a steel pipe pile embedding method capable of ensuring a high support force for a steel pipe pile despite being inexpensive, and a steel pipe pile body suitable for the method.
[0008]
[Means for Solving the Problems]
In order to achieve this object, according to the steel pipe pile embedding method according to claim 1 of the present invention, a deformed pile having a frictional force-enhanced outer shape, which is separate from a steel pipe pile having a smooth outer peripheral surface , A steel pipe pile body that is integrally connected to the top of the steel pipe pile and at least a packer that can be expanded in the weft direction around the top part of the steel pipe pile is formed on the ground by digging down . Inserted from the deformed pile into the pile hole. Then, the packer placed around the head part of the steel pipe pile is pressed against and pressed against the peripheral surface of the pile hole under the expansion in the weft direction accompanying the injection of the injection material into the inside of the pile, and the expansion of this packer Thus, the fixing material is closed and regulated on the bottom side of the pile hole, and the consolidated material is filled and consolidated under pressure injection by an injection hose arranged outside the steel pipe pile.
[0009]
Moreover, the steel pipe pile body according to claim 2 of the present invention is formed with a hollow steel pipe pile having a smooth outer peripheral surface and a frictional force enhancing outer shape different from that of the steel pipe pile. A deformed pile integrally connected on the same axis, a packer integrally disposed around the head portion of the steel pipe pile, and expanded at least in the weft direction under the injection of the injection material into the inside thereof, Distributing a discharge port on the side of the deformed pile from the packer, equipped with an injection hose arranged outside the steel pipe pile, and by expanding the packer after insertion into the pile hole, the pile hole bottom side from this packer, It is possible to stipulate the closure as the fixing length for the ground.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0011]
As shown in FIGS. 1 and 2, in the steel pipe pile body 10 according to the present invention, a deformed pile 14 having a frictional force-enhancing outer shape different from the cross-sectional outer shape of the steel pipe pile is integrally formed at the head of the steel pipe pile 12. And a packer 18 that is expanded in the weft direction under injection of the injection material 16 is integrally disposed around a part of the steel pipe pile.
[0012]
The steel pipe pile 12 used in the steel pipe pile body 10 is a hollow steel pipe similar to the conventional one. For example, a threaded joint 20, that is, a male screw 20-1, and a female screw 20-2 are provided at each end. Is provided. A deformed pile 14 having a frictional force-enhancing outer shape, for example, a non-circular cross-sectional outer shape, is integrally connected to the head of the steel pipe pile 12 via a screw joint 20.
[0013]
The deformed pile 14 is formed, for example, as a deformed steel pile in which a plurality of, for example, eight small-diameter rebars 24, for example, are fixed along the length direction of the cylindrical steel material 22 having substantially the same diameter as the steel pipe pile 12. The upper end of the steel pipe pile 12 is arranged and connected on the same axis via the male screw 20-1.
[0014]
As the cylindrical steel material 22 forming the deformed pile 14, for example, it is desirable to use a closed-bottomed cylindrical body closed at either end, and in this embodiment, the bottom, that is, the bottom at the bottom in the figure. This cylindrical steel material is embodied as having .
[0015]
For example, a packer 18 as a substantially donut-shaped bag body is integrally wrapped around a part of the steel pipe pile 12, specifically, a part near the head, by sticking or the like.
[0016]
The packer 18 is a cloth packer made of a woven fabric that can expand at least in the weft direction, that is, in the diametrical direction, and an injection material 16 such as cement is injected into the bag by an injection tube 26 having a tip inserted into the bag body. By injecting and solidifying grout material such as milk, it is possible to expand in the weft direction, that is, in the diameter direction.
[0017]
As can be seen from FIG. 1, the steel pipe pile embedding method according to the present invention is the inside of a pile hole 30 having a required diameter and a required depth formed by digging the ground 28 with the steel pipe pile body 10 assembled in this way. This is done by inserting and arranging.
[0018]
Excavation formation of the pile hole 30 with respect to the ground 28 is not the intent of the present invention, and it is sufficient to use a drilling machine, for example, a double pipe drilling hole, etc., as in the prior art. A detailed description of the process is omitted here.
[0019]
And in this invention, the above-mentioned steel pipe pile body 10 is inserted and arranged from the deformed pile 14 into the pile hole 30 of the ground, and after the insertion, the injection pipe 26 is inserted into the packer 18 around the head portion of the steel pipe pile. Injecting material 16 is injected through this, and this packer is pressed against and crimped to the circumferential surface of the pile hole under the expansion in the weft direction.
[0020]
In addition, since the injection of the injection material 16 into the packer 18 is a pressure injection with a predetermined pressure, the pressure contact and the pressure bonding to the circumferential surface of the pile hole are surely performed. And since this packer 18 is a bag made of a woven fabric having sufficient flexibility, the degree of adhesion is maintained sufficiently high by surface deformation according to the irregularities of the peripheral surface of the pile hole.
[0021]
As can be seen from FIG. 1, in this configuration, due to the expansion of the packer 18, the bottom region of the pile hole 30 from the packer is closed and defined as the fixing length portion L <b> 1 whose upper end is closed. In the present invention, the fixing length L1 is filled with the solidified material 34 under the pressure injection by the injection hose 32 disposed outside the steel pipe pile 12, and the consolidation is performed. Thus, a consolidated body 34 of the consolidated material is formed in the fixed length of the closed portion including the periphery of the deformed pile 14 (see FIG. 2).
[0022]
In addition, as a solidification material used here, grout materials, such as cement milk, can be illustrated, and the solidification body by this is usually called a concrete trunk.
[0023]
As described above, the steel pipe pile embedding method according to the present invention inserts and arranges the steel pipe pile body 10 in which the deformed pile 14 is arranged at the head of the steel pipe pile 12 in the pile hole 30, so that it is fixed in the pile hole. The frictional force with the consolidated solid body (concrete trunk) 34 is surely increased. In the present invention, in addition to increasing the frictional force due to the outer shape of the deformed pile 14, in order to inject a consolidated material (grouting material) under a predetermined high pressure around the deformed pile, The adhesion strength of the consolidated material, that is, the consolidated body 34 to the irregularly shaped pile is surely enhanced. Further, since the adhesion of the consolidated body 34 to the circumferential surface of the pile hole 30 is reliably strengthened by the pressure injection of the consolidated material, according to the present invention, the steel pipe pile body 10 to the ground 28 and eventually the steel pipe The supporting force of the pile 12 is surely strengthened.
[0024]
And since the solidified body 34 formed by the pressure injection of this solidified material does not easily deform, even if the load from the steel pipe pile 12 acts on this consolidated body intensively, It is possible to sufficiently maintain the function of reliably transmitting to the ground. Therefore, according to this invention, embedding of the steel pipe pile 12 with a high supporting force can be performed reliably.
[0025]
Further, in the present invention, since the consolidated material is only injected under pressure into the fixing length portion L1 closed and defined by the packer 18, the steel pipe pile 12 located on the upper portion thereof, that is, on the opening side of the pile hole 30 is used. It is no longer necessary to apply frictional force-enhancing processing to the peripheral surface of. That is, no additional processing is required for the steel pipe pile 12, and a normal steel pipe can be used as the steel pipe pile, so that the amount of expensive steel pipe pile used can be reliably reduced.
[0026]
The deformed pile 14 exemplified in this embodiment is formed by fixing a plurality of small-diameter rebars 24 along the length direction on the peripheral surface of the cylindrical steel material 22, so that the processing itself is easy and inexpensive. It can be done.
[0027]
Therefore, according to the present invention, it is possible to sufficiently ensure a high supporting force in the steel pipe pile 12 despite being inexpensive.
[0028]
Furthermore, in the present invention, the packer 18 is integrally arranged around the top portion of the steel pipe pile 12, and this is pressed against and pressed against the peripheral surface of the pile hole 30 under expansion. The supporting force can be secured even higher. And, since this packer 18 has a center riser function or a spacer function for holding the steel pipe pile body 10, that is, the steel pipe pile 12, in the approximate center of the pile hole 30, its positioning effect is further improved. The
[0029]
And according to the steel pipe pile body 10 of the present invention, the steel pipe pile embedding method can be appropriately performed, and it is possible to easily contribute to the cost reduction and the enhancement of the supporting force.
[0030]
In this embodiment, the caking material is pressure-injected only into the fixing length portion L1 that is blocked by the packer 18, but if necessary, the so-called upper portion of the packer is a so-called A freezing material may be filled around the free length.
[0031]
According to such a configuration, since the support force against horizontal load is further enhanced, it is particularly effective when the formation of the fixing long portion L1 has a low reliability.
[0032]
In this embodiment, the steel pipe pile body 10 is embodied in the case where the steel pipe pile 12 is a single body, but it is possible to add the steel pipe pile according to the depth of the pile hole 30.
[0033]
Here, in the above-described embodiment of the present invention, the deformed pile 14 is embodied as a deformed pile 14 in which a plurality of small-diameter rebars 24 are arranged on the peripheral surface of the cylindrical steel material 22. Since the cross-sectional outer shape is different from the cross-sectional outer shape of the steel pipe pile 12, it is sufficient if it has a peripheral surface shape having a large adhesive force or an outer surface shape, and is not limited to this. For example, FIG. 3, a deformed rod pile 114 in which a substantially disc-shaped stopper plate 36 is integrally combined with the tip of a single rod 34, and a plurality of spaced apart juxtapositions as shown in FIG. A deformed rod pile 214 or the like in which a single substantially disc-shaped stopper plate 40 is integrally combined with the tips of the four rods 38 may be used as a deformed pile connected to the top of the steel pipe pile 12. .
[0034]
Even in such a configuration, it is possible to reliably increase the adhesion of the consolidated material to the deformed piles 114 and 214, that is, the consolidated body 34. Therefore, the same effects as those of the above embodiment are sufficiently ensured in these cases. It becomes possible.
[0035]
In the embodiments of the present invention, a steel pipe pile 12 and profiled piles 14, but embodying as being integrally connected by screw joint 20, steel pipe piles, integrally connected between profiled piles However, the present invention is not limited to this, and may be connected to each other under joints of other configurations or welding.
[0036]
However, if the threaded joint 20 is used for the connection between the steel pipe pile 12 and the deformed pile 14, the connection becomes easy and the operation itself can be simplified. And if it is the screw type joint 20, since it can utilize also for the extension of the steel pipe pile 12, the versatility will be taken.
[0037]
The above-described embodiments are for explaining the present invention, and do not limit the present invention. All modifications, alterations, and the like within the technical scope of the present invention are included in the present invention. It goes without saying that it is done.
[0038]
【The invention's effect】
As described above, according to the steel pipe pile embedding method according to the present invention, since the steel pipe pile body in which the deformed pile is arranged at the head of the steel pipe pile is inserted and arranged in the pile hole, it is consolidated and formed in the inside thereof. In addition to the increased frictional force due to the outer surface shape of this deformed pile, the consolidated body is pressurized and injected under a predetermined high pressure around the deformed pile. For this reason, the adhesion strength of the consolidated material, that is, the consolidated body to the deformed pile is surely enhanced. Furthermore, since the pressure injection of this consolidated material also surely strengthens the adhesion of the consolidated body to the peripheral surface of the pile hole, according to the present invention, the bearing capacity of the steel pipe pile body and consequently the steel pipe pile to the ground Will definitely be strengthened.
[0039]
And since the consolidated body formed by pressure injection of this consolidated material does not easily deform, even if the load from the steel pipe pile acts on this consolidated body, it is surely ensured. It is possible to sufficiently maintain the function of transmitting to the ground. Therefore, according to this invention, embedding of the steel pipe pile with a high supporting force can be performed reliably.
[0040]
Further, in the present invention, since the consolidated material is merely injected under pressure into the fixing length portion closed and regulated by the packer, no additional processing is required for the steel pipe pile. That is, as this steel pipe pile, a normal steel pipe can be used, and the usage-amount of an expensive steel pipe pile can be reduced reliably.
[0041]
Therefore, according to the present invention, it is possible to sufficiently ensure a high supporting force in the steel pipe pile despite being inexpensive.
[0042]
Furthermore, in this invention, the packer is integrally arranged around the head portion of the steel pipe pile, and this is pressed and crimped to the peripheral surface of the pile hole under expansion. Power can be secured even higher. And since this packer has the steel pipe pile body, ie, the center riser function or spacer function which hold | maintains a steel pipe pile in the approximate center of a pile hole, the certainty of the construction is further improved by the positioning effect.
[0043]
And according to the steel pipe pile body of this invention, the said steel pipe pile embedding construction method can be performed appropriately, and it becomes possible easily to fully contribute to the cost reduction and reinforcement of a bearing capacity.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing a steel pipe pile burying method according to the present invention.
FIG. 2 is a partially perspective schematic perspective view of a steel pipe pile body according to the present invention.
FIG. 3 is a partially broken schematic perspective view showing a modified example of a modified pile.
[Explanation of symbols]
10 Steel pipe pile
12 Steel pipe pile
14 Profile pile
18 Packer
30 Pile hole
34 Consolidation

Claims (2)

It is a steel pipe pile burying method in which a steel pipe pile is inserted and placed in a pile hole formed by digging the ground , and this steel pipe pile is buried in the ground under the consolidation of the consolidated material filled in the pile hole.
Separately from a steel pipe pile with a smooth outer peripheral surface, a deformed pile with a frictional force-enhanced outer shape is integrally connected to the top of the steel pipe pile, and at least a packer that can expand in the weft direction is connected to the steel pipe pile. The steel pipe pile body, which is formed by arranging it around the top part of the steel, is inserted and placed from the deformed pile into the pile hole formed in the ground by digging down ,
The above-mentioned packer placed around the top of the steel pipe pile is pressed against and pressed against the peripheral surface of the pile hole under the expansion in the weft direction as the injection material is injected into the pile, and the expansion of this packer A steel pipe pile burying method in which the solidified material is filled and consolidated under pressure injection with an injection hose placed outside the steel pipe pile inside the fixed length defined by the bottom of the pile hole. A hollow steel pipe pile with a smooth outer peripheral surface ;
A deformed pile formed with a frictional force-enhancing profile different from that of the steel pipe pile and integrally connected to the head of the steel pipe pile on the same axis;
A packer that is integrally disposed around the leading portion of the steel pipe pile and that is expanded at least in the weft direction under the injection of the injection material therein;
An injection hose arranged outside the steel pipe pile with a discharge port on the side of the shaped pile from the packer;
A steel pipe embedded in a pile hole formed by digging up the ground, which allows the bottom of the pile hole to be closed from the packer as a fixed length to the ground by expansion of the packer after insertion into the pile hole Pile body.

Images