KR20190143204A - Joint for ultra high strength concrete pile - Google Patents

Abstract

The present invention relates to an ultra-high strength concrete pile joint capable of being applied to a joint part of an ultra-high strength concrete pile with increased support force and solving various problems of existing welding connection methods by forming a pile joint by combining a plurality of U-shaped support plates closely with the outer edge surface of a connection ring combined inside upper and lower plates spaced vertically. The ultra-high strength concrete pile joint for connecting ultra-high strength concrete piles comprises: upper and lower plates spaced vertically from each other and including a bolt coupling hole formed on a position corresponding to a PC nut formed on a concrete pile; a cylindrical connection ring connecting the insides of the upper and lower plates; and a plurality of support plates installed between the upper and lower plates. The support plates have a U-shape having a cross section with an open inside, so its inner end is attached to the outer edge surface of the connection ring.

Description

Joint for ultra high strength concrete pile

The present invention by applying a plurality of U-shaped support plate in close contact with the outer peripheral surface of the connection ring coupled to the upper and lower plates provided spaced up and down to form a pile joint, can be applied to the joint of the ultra-high strength concrete pile by improving pile bearing capacity It is about a super-high strength concrete pile joint that can solve various problems with the welding seam method.

When pile depth is longer than unit concrete pile length when constructing various structures, a plurality of concrete piles should be connected up and down.

Therefore, in the related art, the joint joints 3 and 3 'are joined to the top and bottom neighboring concrete piles 1 and 1' as shown in FIG. 1, and the welding joint method of welding the neighboring joint iron plates 3 and 3 'to each other. Was used a lot.

However, this welding joint method has a large variation in welding quality according to the skill of the operator, which limits the reliability of the quality. In addition, it takes a long time for welding of the joint, and there is a fear of causing air delay under the influence of weather and field conditions. In addition, due to factors such as professional welders, welding equipment, material costs can also be a factor of the increase in construction costs.

In addition, the welding site requires a non-destructive inspection by a specialized test institute at least once per 20 welded joints, and there is a problem in worker safety such as electric shock, harmful gas generation, and fire caused by spark generation due to the use of high voltage electricity.

Therefore, as shown in FIG. 2, a separate field welding is performed by using a pile joint 100 in which a cylindrical guide ring 111 and a support piece 112 are coupled between upper and lower flange portions 120 and 130. The use of bolted joints connecting upper and lower concrete piles by bolts without a process is increasing (Patent No. 10-0976563, etc.).

On the other hand, in recent years, the application of concrete piles using ultra-high strength concrete of 110MPa or more to increase the bearing capacity and reduce the number of piles is increasing.

However, since the strength of the concrete pile joint by the bolt joint method is lower than the strength of the concrete pile body, buckling occurs in the support piece 112 at a high load, such as a factor that does not properly exhibit the advantages of the actual ultra-high strength concrete pile. It's working.

In order to solve the above problems, the present invention is to join the concrete pile up and down by bolt fastening method, super high strength concrete pile joint that can overcome various problems of the upper and lower concrete pile joint by the conventional welding joint method To provide.

The present invention is to provide a very high-strength concrete pile joint that can withstand high loads can be applied to the joint of the ultra-high strength concrete pile.

The present invention according to a preferred embodiment relates to pile joints for interconnecting ultra-high strength concrete piles, each of which is formed in a circular band shape so that bolt fastening holes are formed at positions corresponding to PC nuts formed in concrete piles. An upper plate and a lower plate provided to be spaced apart from each other; A cylindrical connection ring interconnecting the inner side of the lower plate and the upper plate; And a plurality of support plates provided between the upper plate and the lower plate. Consisting of, the support plate is formed in a U-shape of the inner side of the cross-section to provide an ultra-high strength concrete pile joint, characterized in that the inner end is configured to be in close contact with the outer peripheral surface of the connection ring.

The present invention according to another preferred embodiment provides an ultra-high strength concrete pile joint, characterized in that the stiffener for supporting the upper plate and the lower plate is provided inside the support plate.

The present invention according to another preferred embodiment provides a super-high strength concrete pile joint, characterized in that the filler is filled in the interior of the support plate.

According to another preferred embodiment of the present invention, the stiffener is located on the connection ring side or the outer side, it provides an ultra-high strength concrete pile joint, characterized in that arranged in parallel with the connection ring.

According to another preferred embodiment of the present invention, at least one or more of the upper plate and the lower plate provides an ultra-high strength concrete pile joint, characterized in that the outer diameter is larger than the outer diameter of the concrete pile to be bonded.

According to the present invention, a pile joint may be configured by closely coupling a plurality of U-shaped support plates to the outer circumferential surface of the connection ring coupled to the upper and lower plates provided spaced up and down. Accordingly, the U-shaped support plate can increase the cross-sectional area of the pile joint to improve the bearing force, and the plate width thickness ratio is reduced by the U-shaped bent plate formed to increase the resistance to buckling. Therefore, it is able to withstand high loads sufficiently and can provide an ultra high strength concrete pile joint applicable to the joint of the ultra high strength concrete pile.

According to the present invention, after pre-assembly pile joint at the bottom of the upper concrete pile in the factory, it is possible to complete the joint of the upper and lower concrete piles by a simple process of bolting the pile joint to the top of the lower concrete pile in the field. Accordingly, it is possible to solve the problems of the conventional welding seam method, to ensure a uniform quality of the joint, and to improve the speed of the joint is economical because the construction time can be shortened.

1 is a side view showing a conventional welded upper and lower concrete pile.
Figure 2 is a perspective view showing a pile joint for bolting conventional upper and lower concrete piles.
Figure 3 is a perspective view showing the present invention ultra high strength concrete pile joint.
4 is a perspective view showing a coupling relationship of the present invention ultra-high strength concrete pile joint;
Figure 5 is a perspective view showing a connection state of the concrete pile by the present invention ultra-high strength concrete pile joint.
Figure 6 is a perspective view showing a part of the pile joint coupled to the stiffener inside the support plate.
7 is a perspective view showing a part of a pile joint filled with a filler in a support plate;
8 is a perspective view showing a part of a pile joint in which an injection hole is formed in an upper plate;
9 is a plan view showing a portion of the pile joint in which the upper plate or the lower plate protrudes out of the concrete pile;

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

Figure 3 is a perspective view showing a super high strength concrete pile joint of the present invention, Figure 4 is a perspective view showing a coupling relationship of the ultra high strength concrete pile joint of the present invention, Figure 5 is a concrete pile of the super high strength concrete pile joint of the present invention It is a perspective view which shows the connection state.

As shown in Figures 3 to 5, the present invention ultra high strength concrete pile joint relates to a pile joint (2) for interconnecting the ultra high strength concrete pile (1, 1 '), each formed in a circular band shape The upper plate 21 and the lower plate 22 which are spaced apart from each other vertically by being formed with bolt fastening holes 211 and 221 at positions corresponding to the PC nuts formed in the concrete piles 1 and 1 '; A cylindrical connection ring 23 for interconnecting the inner side of the lower plate 22 and the upper plate 21; And a plurality of support plates 24 provided between the upper plate 21 and the lower plate 22. It is configured as, the support plate 24 is characterized in that the inner end of the cross-section is formed in a U-shaped open so that the inner end is in close contact with the outer peripheral surface of the connection ring (23).

The present invention is to provide a very high-strength concrete pile joint capable of withstanding high load while joining the concrete pile (1, 1 ') up and down by bolt fastening method.

The present invention is for bolting the concrete pile (1, 1 ') without damage to the joint even when the joint of the ultra-high strength concrete pile (1, 1') of 110MPa or more.

The ultrahigh strength concrete pile joint of the present invention includes an upper plate 21 and a lower plate 22, a connection ring 23, and a support plate 24 provided to be spaced apart from each other up and down.

The upper plate 21 and the lower plate 22 are each formed in a circular band shape so that a predetermined space is formed therein.

The upper plate 21 and the lower plate 22 are formed with bolt fastening holes 211 and 221 at positions corresponding to the PC nuts formed in the concrete piles 1 and 1 '.

The upper plate 21 and the lower plate 22 may be fixed to the concrete piles 1 and 1 'by inserting the bolts B through the bolt fastening holes 211 and 221.

Each bolt (B) is bolted to the PC nut of the concrete pile (1, 1 ') through the bolt fastening holes (211, 221).

The connection ring 23 is to interconnect the inside of the lower plate 22 and the upper plate 21, it is configured in a cylindrical shape.

At this time, the inner circumferential surface diameter of the upper and lower plates 21 and 22 may be configured to be shorter than the inner circumferential surface diameter of the connection ring 23. That is, the inner circumferential surfaces of the upper and lower plates 21 and 22 are formed to protrude a predetermined length into the connection ring 23, so that the connecting ring 23 and the upper and lower plates 21 and 22 can be welded inside the connection ring 23. Can be configured to

The support plate 24 is provided with a plurality between the upper plate 21 and the lower plate 22.

The plurality of support plates 24 are disposed to be spaced apart from each other along the circumference of the connection ring 23.

Each support plate 24 is formed in a U-shape in which the inside of the cross section is open, and is configured such that the inner end thereof comes into close contact with the outer circumferential surface of the connecting ring 23.

When the support plate 24 is formed in a U-shape rather than a-character, the cross-sectional area of the pile joint 2 can be increased to improve the bearing force of the pile joint 2.

Furthermore, since the support plate 24 is bent in a U-shape to reduce the plate width thickness ratio, the resistance to buckling increases.

The U-shaped support plate 24 has an open inner end welded to the outer surface of the connection ring 23, the lower end and the upper end are in close contact with the lower plate 22 and the upper plate 21 are welded.

At this time, the support plate 24 may be provided in the same number as the number of bolt fastening holes (211, 221) formed in the upper and lower plates (21, 22).

That is, the support plate 24 is provided between the bolt fastening holes 211 and 221 of the upper plate 21 and the lower plate 22 so that the fastening space 25 may be formed between the adjacent support plates 24. Can be.

The tool may be inserted through the fastening space 25 to fasten the upper and lower plates 21 and 22 and the concrete piles 1 and 1 'with bolts B.

The pile joint 2 may be pre-assembled at the bottom of the upper concrete pile 1 'in the factory and brought into the site. Subsequently, by bolting the pile joint 2 to the top of the lower concrete pile 1 at the site, the joint of the concrete piles 1 and 1 'may be completed. Therefore, the construction time can be shortened and economical.

In addition, compared to the conventional welding joint method is not affected by operator skill or climatic conditions, it is convenient, and can be managed by the bolt torque value can ensure a uniform quality of the joint.

In addition, the upper and lower concrete piles (1, 1 ') by the bolt fastening method, so the joint speed is very fast and when the material is imported in the factory pre-fastening can significantly reduce the site construction time.

6 is a perspective view illustrating a part of a pile joint in which a stiffener is coupled to a support plate.

As shown in (a) and (b) of FIG. 6, a stiffener 26 supporting the upper plate 21 and the lower plate 22 may be provided in the support plate 24.

The stiffener 26 is installed in the transverse direction in the circumferential direction in Fig. 6 (a), it was installed in the longitudinal direction in the radial direction in Fig. 6 (b).

Both ends of the stiffener 26 may be welded to the inner surface of the support plate 24 (FIG. 6A).

Alternatively, the stiffener 26 may be welded to one end of the outer surface of the connection ring 23, the other end of the stiffener 26 to the inner surface of the support plate 24 (Fig. 6 (b)).

When the stiffener 26 is used, it is possible to greatly increase the resistance to buckling while using a thinner steel as the support plate 24.

As shown in FIG. 6A, when the stiffener 26 is located at the center of the support plate 24, the plate width thickness ratio of the support plate 24 is maintained while supporting the compressive load by the cross-sectional area of the stiffener 26 itself. It is effective in preventing buckling.

FIG. 7 is a perspective view illustrating a portion of a pile joint in which a filler is filled in a support plate, and FIG. 8 is a perspective view illustrating a pile joint in which an injection hole is formed in an upper plate.

As shown in FIG. 7 and FIG. 8, the filler 27 may be filled in the support plate 24.

When the concrete piles (1, 1 ') are composed of ultra-high strength concrete having a strength of 110 MPa or more, the amount of steel is excessive to completely transmit the strength of the concrete piles (1, 1') to the pile joint (2). Can be economically inferior.

Therefore, by utilizing the inner space of the U-shaped support plate 24 can be made to share the compressive force by filling the filler 27 inside the support plate 24.

The filler 27 may be composed of non-contraction mortar, epoxy, or the like.

In order to inject the filler 27 into the support plate 24, as shown in FIG. 8, an injection hole 212 may be formed in the upper plate 21 at a portion where each support plate 24 is positioned.

The U-shaped support plate 24 and the connection ring 23 restrains the inner filler 27 to improve compressive strength, and the inner filler 27 supports the support plate 24 and the coupling ring 23. The buckling of the support plate 24 or the connection ring 23 is prevented.

As illustrated in FIG. 7, the stiffeners 26 may be positioned at the connection ring 23 side or the outer side, and may be arranged to be parallel to the connection ring 23.

When the filler 27 is filled in the support plate 24 through the injection hole 212, the stiffener 26 may interfere with the injection and flow of the filler 27. Therefore, the stiffeners 26 may be disposed to be biased toward one side, which is the outer side of the connection ring 23 side or the support plate 24.

In this case, it is preferable that the stiffeners 26 are arranged on the outer side of the support plate 24 having a relatively small cross-sectional area to equalize the load distribution. However, when it is difficult to closely contact the stiffener 26 to the outer side inside the support plate 24 due to the bending radius of the support plate 24, the stiffener 26 can be installed close to the connection ring 23 side as shown in FIG.

9 is a plan view showing a portion of the pile joint in which the upper plate or the lower plate protrudes out of the concrete pile.

As shown in FIG. 9, at least one or more of the upper plate 21 and the lower plate 22 may be configured to be larger than the outer diameter of the concrete piles 1 and 1 ′ to which the outer diameter is bonded.

When the outer diameter of at least one of the upper plate 21 and the lower plate 22 is configured as an extended pile joint to protrude from the outer circumferential surface of the concrete pile (1, 1 '), it is possible to increase the bearing force by improving the frictional force of the principal surface in the drilling hole Can be.

In addition, since the outer circumferential surface of the upper plate 21 or the lower plate 22 can be configured to protrude from the outside of the support plate 24, welding (W) can be coupled to the outer circumference of the support plate 24 to support the support plate 24. The upper and lower plates 21 and 22 can be fixed more firmly.

1: concrete pile
2: pile joint
21: upper plate
211: bolt fastener
212 injection hole
22: lower plate
221: bolt fastener
23: connection ring
24: support plate
25: fastening space
26: Stiffener
27: filling material
B: bolt
W: welding

Claims (5)

To a pile joint (2) for interconnecting ultra-high strength concrete piles (1, 1 '),
The upper plate 21 is formed in the shape of a circular band, the bolt fastening holes (211, 221) are formed at a position corresponding to the PC nut formed in the concrete pile (1, 1 ') spaced apart from each other up and down and Lower plate 22;
A cylindrical connection ring 23 for interconnecting the inner side of the lower plate 22 and the upper plate 21; And
A plurality of support plates 24 provided between the upper plate 21 and the lower plate 22; Consisting of,
The support plate 24 is formed in a U-shape of the inner side of the cross section is an ultra-high strength concrete pile joint, characterized in that the inner end is configured to be in close contact with the outer peripheral surface of the connection ring (23).
In claim 1,
Ultra-high strength concrete pile joint, characterized in that the support plate 24 is provided with a stiffener (26) for supporting the upper plate 21 and the lower plate (22).
In claim 1,
Ultra-high strength concrete pile joint, characterized in that the filling material 27 is filled in the support plate 24.
In claim 2,
The stiffener (26) is located on the connection ring 23 side or the outer side, ultra-high strength concrete pile joint, characterized in that arranged in parallel with the connection ring (23).
In claim 1,
At least one or more of the upper plate 21 and the lower plate 22 is an ultra-high strength concrete pile joint, characterized in that the outer diameter is larger than the outer diameter of the concrete pile (1, 1 ') to be bonded.

Images