KR100781676B1 - Two-step supporting pile and construction method thereof - Google Patents

Abstract

The present invention is a pile buried in the ground to reinforce the strength of the foundation or ground, by providing a middle enlarged portion having a larger outer diameter between the leading end and the rear end by distributing the support force in two stages to maximize the supporting effect and The present invention relates to a construction method of two-stage supporting piles, which is applied by a direct drilling method that also combines excavation on the cross ground.

The present invention is a pile embedded in the ground to reinforce the strength of the foundation or the ground, the front end; An intermediate magnification portion extending from the tip portion and having an outer diameter greater than that of the tip portion; And a rear end portion extending from the middle enlarged portion and having an outer diameter smaller than the outer diameter of the middle enlarged portion.

In addition, the present invention is to embed the two-stage support pile in the ground to reinforce the foundation or to strengthen the strength of the ground, (a) excavating the ground and filling the filler larger than the diameter of the middle enlarged portion of the two-stage support pile; (b) inserting a two-stage support pile into the excavation ground; And (c) fixing the distal end portion of the two-stage support file by beating the two-stage support file to provide a construction method of the two-stage support file.

Two-stage support, pile, direct hitting, excavation, bearing capacity

Description

Two-step supporting pile and construction method

1 is a view showing a conventional head-extension file.

2 is a conceptual diagram of a two-stage support file according to the present invention.

3 is a cross-sectional view of an embodiment of a two-stage support pile according to the present invention.

4 and 5 is a view showing an embodiment of a two-stage support pile according to the present invention and a construction method thereof.

6 and 7 are views showing another embodiment of the two-stage support pile according to the present invention and a construction method thereof.

<Description of the symbols for the main parts of the drawings>

10: two-stage support file 11: tip

12: middle enlargement portion 13: rear end portion

20: filling material

E1: first soft layer E2: intermediate layer

E3: second soft layer E4: support layer

The present invention relates to a two-stage support pile and its construction method, and more particularly, by providing an intermediate enlarged portion having a larger outer diameter between the leading end and the rear end as a pile embedded in the ground to reinforce the strength of the foundation or the ground. The present invention relates to a two-stage supporting pile which maximizes the supporting effect by dispersing the supporting force in two stages, and a construction method of two-stage supporting piles which is applied by the direct drilling method that combines excavation on the cross ground.

In general, designation is performed to reinforce the foundation or to strengthen the strength of the ground in order to safely support the foundation of the structure. Designated construction is divided into compaction designation (rubble designation, sand designation, gravel designation), raft designation, peer designation, (ready-made) pile designation, in-place concrete pile designation, and the load, ground condition and construction conditions of the structure. And so on. The double pile designation is the most commonly used method. The pile pile is embedded in the ground so that the load capacity is exerted by the tip bearing capacity of the pile tip and the friction bearing force of the pile side.

Pile designation is divided into direct drilling method and excavation method according to the construction method. The direct tactic method is a method of forcing a pile into the ground by striking the file and then hitting it from above. When the pile shaft is forcibly inserted by driving energy, the pile shaft is infiltrated by pushing the soil around, and thus the external bearing capacity of the pile is good. However, it is difficult to vertically penetrate and is limited to the ground of the soft layer. As a result, there is a disadvantage in construction that it is difficult to apply to downtown.

Excavation method is the method of digging the ground in advance with the excavator and then inserting the pile (of course, it is possible to fix only the tip of the pile with a solid material such as cement grout, or to fix the whole pile by filling the concrete and filling material). It is widely used because it solves construction problems. However, since the piles infiltrated by the excavation method are excavated after the ground is excavated larger than the diameter of the pile, they do not exert great side frictional force and mainly exert only the end support force. Therefore, the excavation method loses the peripheral frictional force compared to the direct drilling method. can do.

On the other hand, in general, the pile is used to produce a material such as steel, concrete material in a single shape. In recent years, however, a head extension file as shown in FIG. 1 has been proposed to improve the bearing capacity of a single shape file. The head extension pile is a pile in which the diameter of the tip portion is enlarged by mounting a reinforcing part having a diameter larger than the diameter of the pile part, and the tip bearing force is increased by expanding the ground area between the tip surface and the ground.

However, such a head-expanded pile has a problem that, when the construction is applied by the direct stroke method, the driving energy is dispersed and the penetration of the pile is not easy, and when the construction is applied by the excavation method, excavation is performed. By infiltrating the pile, it is to be struck and settled on the support layer.

The present invention has been made to improve the above-mentioned conventional problems, the support force is doubled by providing an intermediate enlarged portion having a larger outer diameter between the leading end and the rear end as piles buried in the ground to reinforce the strength of the foundation or ground. The purpose is to provide a two-stage support pile that can be distributed to maximize the support effect.

Another object of the present invention is to provide a two-stage support pile and a construction method thereof, which is advantageous for fixing the pile, while the ground is compacted at the time of excavation after excavation by providing an intermediate enlarged portion while leaving the tip portion intact.

Another object of the present invention is to provide a method for constructing a two-stage support pile that can be applied to the intermediate support layer by applying the two-stage support pile to the intersecting ground as a direct support method.

The present invention for achieving the above object is a pile buried in the ground to reinforce the strength of the foundation or ground, the front end; An intermediate magnification portion extending from the tip portion and having an outer diameter greater than that of the tip portion; And a rear end portion extending from the middle enlarged portion and having an outer diameter smaller than the outer diameter of the middle enlarged portion.

In addition, the present invention is to embed the two-stage support pile in the ground to reinforce the foundation or to strengthen the strength of the ground, (a) excavating the ground and filling the filler larger than the diameter of the middle enlarged portion of the two-stage support pile; (b) inserting a two-stage support pile into the excavation ground; And (c) fixing the distal end portion of the two-stage support file by beating the two-stage support file to provide a construction method of the two-stage support file. At this time, as the ground hardens, the first soft layer, the middle layer, the second soft layer, and the support layer are sequentially formed from the ground surface, but the first soft layer and the second soft layer can be directly piled, but the middle layer and the support layer are piles of the pile. In the case of the cross ground composed of hardened hard to direct, the tip portion of the two-stage support pile has a length greater than the second soft layer thickness, the step (a) is made up to the intermediate layer, the step (c) is a two-stage support pile Directly hitting the tip end portion of the two-stage support pile through the second weak layer, and may be made by stepping to settle in the support layer.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

2 is a conceptual view of the two-stage support pile according to the present invention, the two-stage support pile 10 of the present invention, as shown in the middle portion of the leading end portion 11 and the rear end portion 13 with an outer diameter larger than these ( 12) is characterized in that it is configured to be provided. In other words, in order to increase the bearing capacity, the tip portion is enlarged in the related art, but in the present invention, the tip portion 11 is left as it is and the middle portion is enlarged to form a step. As a result, the pile bearing force can be distributed to the tip portion 11 and the intermediate enlarged portion 12.

Figure 3 is a cross-sectional view of an embodiment of a two-stage support pile according to the present invention, showing a method of manufacturing the two-stage support pile as two separate members.

Figure 3 (a) is a pile made of concrete, after the head is extended to produce a pile like a file, such as a head extension 11 is produced by the end portion 11, the expanded head is an intermediate enlarged portion 12 ) In order to connect the middle enlarged portion 12 and the tip portion 11, the inside portion of the middle enlarged portion 12 is manufactured as a step, and the tip portion 11 is configured to be accommodated at the step of the middle enlarged part 12.

Figure 3 (b) is a file made of steel pipe, the steel plate of a predetermined thickness formed with wedges on both sides is made to connect two separate steel pipe, the steel plate is the intermediate enlarged portion 12 soon. The wedge of the steel plate is arranged to be received in two separate steel pipes, respectively, and then the steel plate and the steel pipe are welded to each other. As a result, one steel pipe becomes the leading end portion 11 and the other steel pipe around the steel plate. Becomes the rear end 13 to complete the two-stage support pile 10 of the present invention.

Of course, the structure as shown in Figure 3 (b) can be produced with a concrete pile. In other words, when manufacturing a concrete pile, a reinforcement plate is added to the front end of the concrete pile, and the reinforcement plate is extended from the front end to produce a head extension pile, and the head extension pile and the concrete pile (head extension pile) After the reinforcing plate is arranged to abut each other and then welded to the reinforcing plate is a two-stage support file of the structure as shown in FIG. The two-stage supporting piles will be the intermediate enlargement soon as the reinforcement plate serves as the steel plate.

4 to 7 illustrate an embodiment of a two-stage support pile and a construction method thereof, wherein the two-stage support piles 10 of FIGS. 4 and 5 respectively have a length of the tip portion 11 and an intermediate enlargement at the tip portion 11. The construction of the two-stage support pile of FIGS. 6 and 7 is divided according to the form of the straight line, respectively.

The two-stage support pile 10 of FIG. 4 is an example in which the length of the tip portion 11 is short (approximately 10 to 50 cm), and is formed to be inclined from the tip portion 11 to the intermediate enlarged portion 12.

The two-stage support pile 10 of this type is advantageous when compared to a conventional head extension pile when applied to an excavation method on a general ground. This is because, after injecting the pile after drilling, the pile is settled on the support layer by beating the pile, because as shown in FIG. 5, the tip portion 11 will be firmly fixed to the supporting layer while consolidating the ground. That is, since the remaining soil is easy to remain in the excavated ground and the support layer may be nonuniform on the other hand, when the two-stage support pile 10 is struck, the distal end portion 11 and the middle enlarged portion 12 consolidate the support layer together with the remaining soil. As a result, the tip portion 11 is fixed to the support layer. Considering the fixing of the tip portion 11, it is preferable that the two-stage support pile 10 applied to the excavation method is adopted so that the intermediate enlarged portion 12 is formed to be inclined at the tip portion 11 as shown in FIG. This is because the front end portion 11 can be easily settled on the ground while acting as a wedge.

As a result, the tip portion 11 and the middle enlarged portion 12 are buried in the ground while forming a step, and since the tip portion 11 and the intermediate enlarged portion 12 are also grounded with the ground, the supporting force is the tip portion 11 and the middle enlarged portion. The support effect of the pile, which will be distributed to (12), is improved.

Construction by the excavation method is excavated with an excavator as shown in FIG. 5, filling the filler 20 in the excavation ground, and then infiltrating the pile, followed by the pile to settle on the support layer. However, since the filler 20 may be lost while going through the above process, in this case, the filler 20 is additionally replenished in the excavation ground after the batter so as to finish tightly.

The two-stage support pile of FIG. 6 has a long length of the tip portion 11 and is formed to extend vertically from the tip portion 11 to the intermediate enlarged portion 12. The two-stage support pile 10 of this type can be advantageously applied when applied to a mixed method that combines an excavation method and a direct drilling method on the intersecting ground as shown in FIG. That is, the rear end portion 13 and the middle enlarged portion 12 are to be penetrated into the excavated section, the front end portion 11 is to be penetrated by direct hit. As a result, the tip portion 11 of the direct stroke section will exhibit the frictional support of the side together with the tip bearing force, and the intermediate enlargement portion 12 of the excavation section will also exert the tip bearing force against the ground in the middle of the ground. It is expected that the bearing capacity of the pile will be distributed and become more effective.

Coasts and landfills cannot be formed in such a way that as the depth deepens on the surface, the hardness is shallower than the depth, and hardness is likely to form as discontinuous ground. That is, as shown in FIG. 7A, the first soft layer E1, the middle layer E2, the second soft layer E3, and the support layer E4 are sequentially formed from the ground surface according to the hardness. ) And the second soft layer (E3) can be piled directly, but the intermediate layer (E2) and the support layer (E4) can be made of hardness that is difficult to direct pile. In such an intersecting ground, it will be difficult to construct a pile by a direct punching method due to the presence of an intermediate layer (E2), and even the excavation method alone requires a large amount of equipment. Thus, in the present invention, as shown in FIG. 6, the front end portion 11 prepares a two-stage support pile 10 having a length greater than or equal to the thickness of the second soft layer E3, and the excavation is performed up to the intermediate layer E2, and then two support piles ( 10), it is proposed to penetrate the tip portion 11 of the two-stage support pile through the second weak layer E2, and then to fix it to the supporting layer E4.

As a result, the intermediate magnification part 12 will also settle in the intermediate layer E2, so that the intermediate layer E2 will serve as an intermediate support layer supporting the intermediate magnification part 12. Further, if settlement occurs, the intermediate magnification part 12 is It acts as a locking jaw caught in the intermediate layer (E2) serves to suppress the settlement. In consideration of the role of the intermediate enlargement portion 12, the two-stage support pile 10 applied to the mixing method is preferably formed so that the intermediate enlargement portion 12 is perpendicular to the front end portion 11 as shown in FIG. .

Construction by the mixing method is excavated with an excavator as shown in FIG. 7, filling the filler 20 in the excavation ground, and then infiltrating the pile, followed by direct pile and beating again to settle in the support layer (E4). . However, since the filler 20 may be lost while going through the above process, in this case, the filler 20 is additionally replenished in the excavation ground after the batter so as to finish it tightly.

According to the present invention as described above, by maximizing the supporting effect by dispersing the support force in two stages by providing an intermediate enlarged portion having a larger outer diameter between the leading end and the rear end as a pile embedded in the ground to reinforce the strength of the foundation or ground I can do it. In addition, by arranging the intermediate enlargement part with the tip part intact, the ground is settled at the time of excavation and the tip part is settled and it is expected to be advantageous for the file settlement. A solid layer of hardening may be used as an intermediate support layer.

Claims (3)

As a pile buried in the ground to reinforce the strength of the foundation or ground, Tip; An intermediate magnification portion extending from the tip portion and having an outer diameter greater than that of the tip portion; And, A rear end portion extending from the middle enlarged portion and having an outer diameter smaller than that of the middle enlarged portion; Two-stage support file, characterized in that configured to include. In claim 1, The intermediate enlarged portion is a two-stage support pile, characterized in that inclined in the width direction from the leading end or continues vertically. In embedding the two-stage support pile of claim 1 or 2 in the ground to reinforce the foundation or reinforce the strength of the ground, (A) excavating the ground larger than the diameter of the middle enlarged portion of the two support pile and filling the filler; (b) inserting the two-stage support pile of claim 1 or 2 into the excavated ground; And, (c) fixing the leading end of the two-stage support file by beating the two-stage support file; Construction method of a two-stage support file, characterized in that comprises a.

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