KR102071981B1 - Pullout resistant ring pile - Google Patents

Abstract

The present invention relates to a pullout-resistant ring pile. According to the present invention, since a ring plate spirally combined with the outer edge surface of a pile body is formed to be inclined outward upward in a cross section, the support force of a pile as well as the point bearing force can be enhanced while the bending rigidity of the ring plate can be increased. The present invention comprises: a hollow pile body; a plurality of ring plates spirally combined with the outer edge surface of the pile body and spaced in a vertical direction; and a joint nut installed in the upper part of the pile body, and having a polygonal outer edge surface and a female screw thread formed on the inner edge surface. The ring plates are formed to be inclined outward upward at an angle of 3-5° in a cross section to make an outer end of a transverse section upward in order to form a dome shape of which the center is convex downward. The diameter of a ring plate located on the upper side is larger than the diameter of a ring plate located on the lower side. A guide groove is formed in a spiral direction on at least one of the upper and lower surfaces of the ring plates, a cutting ring protrudes from an outer end of the lower surface in a spiral direction along the outer edge of the lower surface, a cutting blade is formed at a starting end of the ring plates, and the pile body includes an inlet formed on the position of the ring plates.

Description

Pullout resistant ring pile {Pullout resistant ring pile}

The present invention forms a ring plate that is spirally coupled to the outer circumferential surface of the pile main body to be inclined upwardly outward in cross section, thereby increasing the bending strength of the ring plate and increasing the bending rigidity of the ring plate. It is about.

The helical pile 10 is a spiral screw plate 12 'coupled to the outer circumferential surface of a hollow pipe-shaped pile body 11 spaced apart from each other, and the support layer rotates to puncture the ground. It is incorporated until (FIG. 1).

The helical pile 10 is exerted by the tip bearing force by the extended area of the screw plate 12 'and the main surface friction force of the pile body 11, and can resist not only a compressive load but also a tensile force. Can be used.

The helical pile has the advantage that the construction is quick and easy because the ground drilling and indentation is made at the same time. In addition, it is eco-friendly because there is no soil, and there is little room for civil complaints because there is no noise and vibration.

In addition, the helical pile has the advantage that ground disturbance is minimized when constructing soft ground.

On the other hand, as described above, the helical pile exhibits a tip bearing force by a large area of the screw plate. However, as shown in FIG. 2, since the conventional helical pile is formed so that the screw plate 12 ′ is horizontal in cross section, there is a possibility of bending deformation of the screw plate 12 ′ due to the pulling force when used for drawing resistance. There is a limit to securing bearing capacity.

KR 10-1238124 B1

In order to solve the above problems, the present invention is to provide a pull-out resistance ring file that can secure the holding capacity of the pull-up resistance file.

The present invention according to a preferred embodiment relates to a pull-out resistance ring pile that is intrusive without cutting by cutting the ground according to the pile rotation, a plurality of spaced apart in the vertical direction by being spirally coupled to the hollow pile body, the outer peripheral surface of the pile body The outer circumferential surface is formed in a polygon, and the inner circumferential surface is formed of a joint nut formed with a female thread on the inner circumferential surface, and the ring plate is 3 upwardly outward in cross section so that the outer end is upward in cross section. It is formed to be inclined at an angle of ~ 5 ° to form a dome shape convex to the bottom, the diameter of the ring plate located on the upper is formed larger than the diameter of the ring plate located on the lower, at least any one of the lower surface and the upper surface of the ring plate At least one guide groove is formed in a spiral direction, the ring A cutting ring protrudes in a spiral direction along the outer edge of the lower surface of the lower surface of the sheet, a cutting edge is formed at the start side end of the ring plate, and an injection hole is formed at the ring plate position at the pile body. Provides a pull out resistance ring file.

delete

delete

delete

delete

According to the present invention, it is possible to provide a pull-out resistance ring pile in which a ring plate spirally coupled to an outer circumferential surface of the pile body is formed to be inclined upwardly outward in cross section.

Accordingly, the upper ground of the ring plate is constrained, so the bearing strength of the ground itself is increased, so that the tip bearing force is increased by the pressure of the ring plate when the pull force is applied to the pile, and the ground reaction force can be supported not only by the flexural rigidity of the ring plate but also by the surface strength There is improved bearing capacity.

In addition, compared to the screw plate of the conventional helical pile horizontally compared to the same thickness, the cross-sectional secondary moment is increased to improve the bending rigidity, it is economical because the thickness of the ring plate can be thinned

1 is a view showing a state in which a conventional helical pile is constructed.
Figure 2 is a perspective view showing the shape of a screw plate provided in a conventional helical pile.
3 is a perspective view showing the present invention pull resistance ring pile.
4 is a perspective view showing a specific shape of the ring plate.
5 is a perspective view showing an injection hole formed in a pile body ;
6 is a perspective view showing a ring plate with a cutting ring;
FIG. 7 is a bottom perspective view showing the ring plate shown in FIG. 6. FIG.
Figure 8 is a perspective view showing a ring plate formed with a guide groove.
9 is a perspective view showing the present invention pull resistance ring pile with a joint nut.
10 is a diagram illustrating a coupling relationship between a pull-out resistance ring file and a steel pipe file.
11 is a cross-sectional view showing a coupling relationship between a joint nut and a head plate.
12 is a perspective view of the pull-out resistance ring pile of the present invention as the diameter of the ring plate becomes smaller toward the bottom.

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

3 is a perspective view showing the pull-out resistance ring pile of the present invention, Figure 4 is a perspective view showing a specific shape of the ring plate.

As shown in FIG. 3 and the like, the pull-out resistance ring pile of the present invention relates to a pull-out resistance ring pile that is intrusive without cutting by cutting the ground according to the pile rotation. The hollow pile body 11 and the pile body 11 It is coupled to the outer circumferential surface is provided on the ring plate 12 and the upper end of the pile main body 11 is provided in a plurality spaced apart in the vertical direction, the outer circumferential surface is formed in a polygon, the inner circumferential surface of the joint nut (13) The ring plate 12 is formed to be inclined at an angle of 3 to 5 ° upward in the cross section so that the outer end portion is upward in a cross section so as to form a dome shape in which the center is convex downward, and a ring plate positioned at an upper portion thereof. The diameter of 12 is greater than the diameter of the ring plate 12 located below.

The present invention is to provide a pull-out resistance ring pile (1) capable of stably securing the tip bearing capacity of the helical pile.

The pull-out resistance ring pile 1 of the present invention includes a pile body 11 and a ring plate 12.

The pile body 11 is to be formed inside the hollow, high strength steel pipe can be used.

The ring plate 12 is helically coupled to the outer circumferential surface of the pile body 11, and a plurality of ring plates 12 are provided to be spaced apart from each other in the vertical direction.

The plurality of ring plates 12 are each independently coupled to the pile main body 11, and preferably 2 to 5 are provided in the pile main body 11.

Each ring plate 12 is coupled to the pile main body 11 so as to rotate one rotation (360 °) along the outer circumferential surface of the pile main body 11, and is formed spirally.

Accordingly, in the case of pile penetration, the ground is cut according to the rotation of the pile so that the pile can be inserted without soiling.

In addition, by using drilling equipment such as pile driver or backhoe, it is possible to rotate intrusion up to a support layer of N value of 50 or more.

The ring plate 12 is formed to be inclined upwardly outward in cross section (FIG. 4).

That is, the ring plate 12 is formed in a concave center as a whole to form a dome shape convex downward.

Accordingly, since the upper ground of the ring plate 12 is restrained when the drawing force is applied to the pile, the bearing strength of the ring plate 12 is increased, so that the bearing force of the ring plate 12 is increased. And unlike the conventional helical pile which supports the ground reaction force only by the bending rigidity of the screw plate, the present invention can support the ground reaction force not only by the bending rigidity of the ring plate 12 but also by the in-plane force, so that the bearing force is improved.

In addition, the cross section secondary moment is increased compared to the existing screw plate horizontally arranged to the same thickness, the bending rigidity is also improved.

Therefore, when the tip support force by the ring plate 12 is increased, and the tip support force is the same, the thickness of the ring plate 12 can be reduced, thereby minimizing the amount of steel.

In addition, since the ring plate 12 itself is convexly formed downward, the present invention has a low ground resistance when the pile is indented, and is advantageous in securing the verticality of the pile.

The lower end of the ring plate 12, that is, the starting end, may have a sharp cutting edge (not shown) to facilitate ground cutting.

As shown in FIG. 4, the ring plate 12 may be configured to be inclined at an angle of 3 to 5 ° upward in cross section.

When the angle θ of the ring plate 12 upward is less than 3 °, the effect of improving the tip bearing capacity against the pull resistance is minimal.

When the angle θ formed by the ring plate 12 upward is more than 5 °, the planar projection area of the ring plate 12 is reduced to reduce the support area. Accordingly, the tip bearing force by the ring plate 12 is reduced. Therefore, it is rather uneconomical to increase the amount of steel to secure support.

5 is a perspective view illustrating an injection hole formed in a pile body.

As illustrated in FIG. 5, the injection hole 111 may be formed in the pile main body 11 so that the grout material may be filled in the disturbed ground around the pile penetration.

Since ground disturbance occurs most around the ring plate 12, the injection hole 111 is preferably formed at the ring plate 12 position.

The grout material injected through the injection hole 111 is filled in the pile body 11 after being grouted on the surrounding ground. Accordingly, the buckling of the pile main body 11 can be prevented and the compressive strength can be increased.

6 is a perspective view showing a ring plate with a cutting ring, and FIG. 7 is a bottom perspective view showing the ring plate shown in FIG. 6.

As illustrated in FIGS. 6 and 7, the cutting ring 121 may protrude in a helical direction along the outer surface of the lower surface of the ring plate 12.

The cutting ring 121 may protrude downward along the outer edge of the ring plate 12.

Since the cutting ring 121 cuts the lower ground during pile rotation penetration, pile rotation penetration is easy.

Since the cutting ring 121 first penetrates into the ground and is firmly supported in the transverse direction, it is easy to secure verticality.

In addition, the cutting ring 121 protruding from the lower portion of the ring plate 12 prevents the soil of the lower portion of the ring plate 12 from leaking out of the ring plate 12. Accordingly, ground disturbance and relaxation due to the cutting of the ring plate 12 can be minimized.

8 is a perspective view illustrating a ring plate in which a guide groove is formed.

As shown in FIG. 8, a guide groove 122 may be formed in at least one of a lower surface and an upper surface of the ring plate 12 in a helical direction.

In general, since the ground is heterogeneous, a resistance deviation may occur depending on the state of the ground during the rotation of the ring plate 12, so that the rotation of the ring plate 12 may be difficult to maintain the verticality of the pile itself off the path. have.

Therefore, by forming the guide grooves 122 in the helical direction on the upper or lower surface or the upper and lower surfaces of the ring plate 12, so that the ring plate 12 is moved along the rotation path to mesh with the ground contacting the guide grooves 122 Can be configured.

Accordingly, it is easy to ensure verticality when the file is entered.

In addition, the ground can be moved only in the spiral direction of the ring plate 12 and at the same time can be prevented from flowing out of the ring plate 12, it is possible to minimize the ground loosening.

9 is a perspective view showing the present invention pull resistance ring pile with a joint nut, Figure 10 is a view showing a coupling relationship between the pull resistance ring file and the steel pipe pile, Figure 11 is a coupling relationship of the joint nut and the head plate. It is sectional drawing which shows.

As shown in FIG. 9, FIG. 10, and the like, an outer circumferential surface of the upper end of the pile body 11 may be formed in a polygon, and an inner nut may be provided with a joint nut 13 having a female thread.

When the depth of the support layer is deep, the joint nut 13 may be coupled to the upper portion of the pile body 11 so as to join another steel pipe pile 2 to the upper portion of the pull-out resistance ring pile 1.

The joint nut 13 may be formed in a polygonal outer circumferential surface to be rotatable or fixed by gripping with a tool.

A female thread is formed on the inner circumferential surface of the joint nut 13 so that the threaded bolt 21 formed on the outer circumferential surface thereof can screw the steel pipe pile 2 coupled to the bottom and the pull-out resistance ring pile 1 of the present invention.

When the joint nut 13 is fixed to the pile main body 11 by screwing, cross-sectional loss is inevitable because a thread is formed on the outer circumferential surface of the pile main body 11 to be fastened.

Therefore, the joint nut 13 is preferably rotated at a high speed in contact with the pile main body 11 to be joined by friction welding which is pressed by frictional heat of the contact surface.

In this case, it is not necessary to process the thread separately in the pile main body 11, there is no cross-sectional loss, and manufacture and construction are very simple.

In addition, such friction welding can minimize the heat affected zone, is economical, and does not require the finishing of the pressure contact surface.

In addition, it is easy to join the dissimilar steel materials, and the joining is easy even when the steel types of the joint nut 13 and the pile main body 11 are different.

As shown in FIG. 11, a head plate 14 for fixing the pile in the foundation may be coupled to the upper portion of the fitting nut 13 as well as the steel pipe pile 2.

It is not necessary to fix the head plate 14 in the case of a compressed file, but in the case of a tension file, the head plate 14 should be fixed to the file body 11.

A ring-shaped coupling groove 141 may be formed at the bottom of the head plate 14 so that the upper end of the coupling nut 13 is inserted and screwed.

12 is a perspective view of the pull-out resistance ring pile of the present invention such that the diameter of the ring plate decreases downward.

Since the ground becomes harder toward the lower side, the lower ring plate 12 can exert a large bearing force even in a narrow area.

Therefore, as shown in FIG. 12, the diameter of the ring plate 12 positioned below the pile main body 11 is smaller than the diameter of the ring plate 12 positioned above, thereby saving steel materials. can do.

1: ring file
11: file body
111: injection hole
12: ring plate
121: cutting ring
122: guide groove
13: joint nut
14: tofu plate
141: coupling groove
2: steel pipe file
21: joint bolt

Claims (5)

It is related to the pull-out resistance ring pile that is cut through the ground according to the rotation of the pile, without penetration
It is provided on the upper end of the hollow pile main body 11, the ring plate 12 is provided in a plurality of spaced apart in the vertical direction to be spirally coupled to the outer peripheral surface of the pile main body 11 and the outer peripheral surface Is formed of a polygon, the inner circumferential surface is composed of a joint nut 13 formed with a female thread,
The ring plate 12 is formed to be inclined at an angle of 3 to 5 ° upward in the cross section so that the outer end in the cross section is upward to form a dome shape with the center convex downward.
The diameter of the ring plate 12 located at the top is formed larger than the diameter of the ring plate 12 located at the bottom,
At least one of the lower surface and the upper surface of the ring plate 12 is formed with a guide groove 122 in the helical direction, the cutting ring 121 at the outer end of the lower surface of the ring plate 12 in the spiral direction along the outer surface of the lower surface Is formed to protrude into
Cutting edge is formed at the end of the start side of the ring plate 12,
Pull-out resistance ring pile, characterized in that the inlet opening 111 is formed in the ring body (12) in the pile body (11). delete delete delete delete

Images