KR102340773B1 - Connector of PHC piles and connection method of PHC pile using the same - Google Patents

Abstract

The present invention relates to a connector for a PHC pile and a connection method of a PHC pile by using the same, wherein a size of the connector is minimized when an upper PHC pile and a lower PHC pile are joined to each other to provide outstanding economic efficiency, make pile joining construction carried out readily and fast, and give excellent structural stability. The connector for a PHC pile according to the present invention comprises: a connection plate formed in a shape corresponding to a shape of an end portion of a PHC pile; a first anchor bolt composed of a head and a body to anchor the connection plate to the upper PHC pile; and a second anchor bolt composed of a head and a body to anchor the connection plate to the lower PHC pile by means of an anchor wedge, wherein the connection plate includes: a first bolt fastening unit consisting of a first head accommodating groove formed on a lower surface of the connection plate in order to accommodate a head of the first anchor bolt and a first through-hole narrower than the head of the first anchor bolt, which communicates with the first head accommodating groove to allow a body of the first anchor bolt to pass therethrough; and a second bolt fastening unit consisting of a second head accommodating groove formed on the top surface of the connection plate to be opened toward the outer side of the connection plate to accommodate a head of the second anchor bolt and a second through-hole which communicates with the second head accommodating groove to allow a head of the second anchor bolt to pass therethrough, wherein the first and second bolt fastening units are alternately formed. In addition, the head of first anchor bolt is tightly anchored on a lower surface of the first head accommodating groove and the anchor wedge inserted into the second head accommodating groove through an opened front surface of the second head accommodating groove is hooked on a lower part of the head of the second anchor bolt while the head of the second anchor bolt is inserted into the second head accommodating groove, thereby anchoring the second anchor bolt.

Description

Connector of PHC piles and connection method of PHC pile using the same}

The present invention relates to a PHC pile connector which minimizes the size of the connector at the time of joining the upper and lower PHC piles, thereby providing excellent economic feasibility, quick and easy pile joint construction, and excellent structural stability, and a PHC pile connecting method using the same.

Recently, PHC piles (pretentioned spun high strength concrete piles) have been widely used in the ready-made concrete pile construction method. PHC piles are manufactured by pre-stressing PC steel, then pouring concrete and centrifugally molding. By compensating for the defects of concrete weak in bending and tensile force, it has high loading capacity and impact resistance, as well as excellent economic efficiency and durability. have.

These PHC piles have a length limitation when manufacturing and transporting, so multiple piles are connected and used in the field.

In the past, welded joints were often used to join PHC piles on-site. However, since on-site welding is greatly affected by the skill of the operator and the on-site weather conditions, it is difficult to expect a homogeneous welding quality, it takes a lot of welding time, and there is a high risk of safety accidents due to high voltage electricity and welding sparks. In addition, since a weldable steel plate for welding must be separately installed at the end of the pile for welding, it may cause an increase in cost.

Accordingly, recently, as in Registered Utility Model No. 20-0345924, the proportion of mechanical joints for fastening separate connectors to upper and lower piles with bolts is increasing.

This bolt fastening method requires a predetermined space for fastening the bolt by inserting a tool. Therefore, the size of the connector becomes large, which in turn requires a large amount of steel, which is uneconomical. In addition, since the bolts must be fastened within a narrow space between the vertical reinforcing plates of the connector, it is difficult to secure a uniform fastening force as only manual tightening of the bolts is required. There is this.

In addition, although the strength of the PHC pile body has increased significantly in recent years due to the increase in the use of high-strength concrete, there is a limit to increasing the thickness of the vertical reinforcing plate of the connector. Therefore, the vertical reinforcing plate of the connector may cause buckling before reaching the maximum bearing capacity that the PHC pile body can support, which inevitably leads to an uneconomical design.

In addition, since compressive stress is mainly transmitted by the vertical reinforcing plate in this conventional connector, stress concentration occurs around the vertical reinforcing plate, and the acupressure stress is unevenly distributed at the end of the pile connection, which is structurally undesirable. can occur Accordingly, in order to evenly distribute the acupressure stress, the upper and lower connecting plates must be thickly formed.

In order to solve the above problems, the present invention minimizes the size of the connector at the time of joining the upper and lower PHC piles, so that the pile joint construction is quick and easy, and the construction of the pile joint is quick and easy, and the PHC pile connection method using the same is provided. would like to provide

The present invention according to a preferred embodiment is a connection plate formed in a shape corresponding to the end shape of the PHC pile to interconnect the upper and lower PHC piles; a first fixing bolt composed of a head and a body to fix the connection plate to the upper PHC pile; and a second fixing bolt composed of a head and a body to fix the connection plate to the lower PHC pile by a fixing wedge; A first head receiving groove formed on the lower surface of the connection plate to accommodate the head of the first fixing bolt in the connection plate and communicating with the first head receiving groove so that the body of the first fixing bolt is passed through The first bolt fastening part composed of a first through hole that is smaller in width than the head of the first fixing bolt and the second head accommodating formed on the upper surface of the connection plate so that the head of the second fixing bolt is received and opened to the outside of the connection plate Second bolt fastening portions are alternately formed with a groove and a second through hole communicating with the second head accommodating groove and through which the head of the second fixing bolt passes, and the head of the first fixing bolt is the lower surface of the first head receiving groove. The head of the second fixing bolt is inserted into the inside of the second head receiving groove, and the fixing wedge inserted into the second head receiving groove through the open front surface of the second head receiving groove is formed. It provides a PHC pile connector, characterized in that the second fixing bolt is fixed to the lower part of the head of the 2 fixing bolts.

The present invention according to another preferred embodiment provides a PHC pile connector, characterized in that a chamfer is formed at the lower inlet of the second through hole.

According to another preferred embodiment of the present invention, the shank of the second fixing bolt body has a larger diameter than the screw portion, and a washer plate for adjusting the height of the second fixing bolt head is provided between the upper surface of the lower PHC pile and the shank. It provides a PHC file connector, characterized in that.

The present invention according to another preferred embodiment is that the fixed wedge is formed in a U-shape in plan view by a pair of fixing wedges spaced apart in the width direction and comprising a fixing piece having an insertion groove formed therebetween and a connecting part connecting the rear end of the fixing piece. Features a PHC file connector.

The present invention according to another preferred embodiment provides a PHC file connector, characterized in that the insertion groove is formed to have an inlet width of the insertion groove smaller than the body diameter of the second fixing bolt so that the body of the second fixing bolt is force-fitted. .

The present invention according to another preferred embodiment provides a PHC pile connector, characterized in that a blocking protrusion for closing the open entrance of the second head receiving groove is protruded from the rear end of the upper surface of the connection part of the fixing wedge.

The present invention according to another preferred embodiment provides a PHC pile connector, characterized in that a support protrusion in close contact with the lower end of the upper PHC pile is protruded from the upper surface of the fixing piece at the position outside the head of the second fixing bolt.

The present invention according to another preferred embodiment provides a PHC pile connector, characterized in that the locking grooves are formed on both sides of the fixing wedge, and the locking protrusions hooked on the locking groove are protruded from both sides of the inner side of the second head receiving groove. do.

The present invention according to another preferred embodiment provides a PHC pile connector, characterized in that the second through hole is formed to be opened to the outside of the connection plate.

In the present invention according to another preferred embodiment, both side surfaces of the second head receiving groove are formed to be inclined so that the width becomes narrower toward the bottom, and both sides of the fixing wedge are inclined surfaces corresponding to the inclined surfaces of both sides of the second head receiving groove. It provides a PHC pile connector, characterized in that it is closely supported with each other.

The present invention according to another preferred embodiment provides a PHC pile connector, characterized in that rail grooves are formed on both sides of the second head receiving groove by sliding and inserting both ends of the fixing wedge.

The present invention according to another preferred embodiment relates to a PHC pile connection method using the PHC pile connector, (a) fixing the connection plate with a first fixing bolt to the bottom of the upper PHC pile, while fixing the connection plate to the top of the lower PHC pile Fastening the second fixing bolt so that the head is spaced apart from the upper surface of the lower PHC pile; (b) lifting the upper PHC pile in which the connection plate is fixed at the bottom and placing the head of the second fixing bolt at the top of the lower PHC pile so that the head of the second fixing bolt is inserted into the second head receiving groove of the connection plate; and (c) inserting a fixing wedge into the lower part of the head of the second fixing bolt through the second head receiving groove to fix the second fixing bolt to the connection plate; It provides a PHC file connection method using a PHC file connector, characterized in that it consists of.

According to the present invention, the PHC pile connector that can connect the PHC pile quickly and easily by combining the upper PHC pile with the connection plate coupled to the lower surface by the first fixing bolt and the lower PHC pile having the second fixing bolt coupled to the upper surface by the first fixing bolt And it is possible to provide a PHC file connection method using the same. In particular, by inserting a fixing wedge between the head of the second fixing bolt passing through the second through hole of the lower surface of the connection plate and the bottom surface of the second head receiving groove, the head of the second fixing bolt is strong so that the second through hole does not fall off. can be fixed firmly.

Accordingly, since the fixing bolt is fastened to the front end of the PHC pile before the PHC pile connection, the pile joint operation is very quick and easy.

In addition, since the stress is transmitted by the acupressure of the connecting plate, which has the same shape as the cross section of the PHC pile, the acupressure stress distribution is uniform, there is no stress concentration, there is no risk of buckling, and the full strength can be utilized even when using the high-strength PHC pile.

In addition, since the connecting plate can be configured in the shape of a thin ring plate, it is possible to precisely manufacture it by casting, etc., and it is economical because the number of members is small, so material management is easy, and the amount of steel can be minimized because of the thin thickness.

1 is a perspective view showing a connecting plate;
Fig. 2 is a cross-sectional view showing a portion A of Fig. 1;
Fig. 3 is a cross-sectional view showing a portion B of Fig. 1;
Figure 4 is a perspective view showing a connection plate coupled to the lower end of the upper PHC pile by a first fixing bolt.
5 is a cross-sectional view showing a process in which the connection plate is coupled to the upper part of the lower PHC pile by the second fixing bolt.
6 is a perspective view showing a fixed wedge;
7 is a plan view showing a state in which the fixed wedge is coupled.
Fig. 8 is a cross-sectional view showing a portion CC' of Fig. 7;
9 is a perspective view showing the upper and lower PHC piles coupled by the PHC pile connector of the present invention.
Fig. 10 is a perspective view showing a connection plate in which a groove portion is formed;
11 is a perspective view showing a coupling relationship between a fixing wedge and a connecting plate in which a support protrusion is formed.
Fig. 12 is a perspective view showing a coupled state of the embodiment shown in Fig. 11;
13 is a cross-sectional view illustrating a state in which the second fixing bolt is coupled in FIG. 12 .
14 is a perspective view illustrating a connection plate having one side of a second through hole open;
Fig. 15 is a bottom perspective view showing the coupling relationship between the connecting plate and the fixed wedge according to Fig. 14;
Figure 16 is a perspective view showing the coupling state of the connecting plate and the fixed wedge according to Figure 14.
17 is a cross-sectional view illustrating a state in which the second fixing bolt is coupled in the embodiment of FIG. 14;
Figure 18 is a perspective view showing the coupling relationship between the upper surface of the stepped portion inclined connection plate and the fixed wedge.
19 is a cross-sectional view illustrating a state in which the second fixing bolt is coupled in the embodiment of FIG. 18;
Fig. 20 is a perspective view showing the engagement relationship of the tapered fixed wedges;
21 is a cross-sectional view showing a state in which the second fixing bolt is coupled in the embodiment of FIG. 20;
22 is a bottom perspective view showing a coupling relationship between a connecting plate provided with a rail groove and a fixed wedge;
23 is a cross-sectional view showing a state in which the second fixing bolt is coupled in the embodiment of FIG. 22;
24 to 27 are diagrams showing step-by-step processes for a PHC pile connection method using the PHC pile connector of the present invention.

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

FIG. 1 is a perspective view illustrating a connection plate, FIG. 2 is a cross-sectional view illustrating a portion A of FIG. 1 , and FIG. 3 is a cross-sectional view illustrating a portion B of FIG. 1 . And Figure 4 is a perspective view showing the connection plate coupled to the lower end of the upper PHC pile by the first fixing bolt, Figure 5 is a cross-sectional view showing the process of coupling the connection plate to the upper end of the lower PHC pile by the second fixing bolt.

1 to 5, the PHC pile connector of the present invention is a connecting plate ( 2); A first fixing bolt (3) consisting of a head (31) and a body (32) for fixing the connection plate (2) to the upper PHC pile (1a); And a second fixing bolt (4) consisting of a head (41) and a body (42) to fix the connection plate (2) to the lower PHC pile (1b) by a fixing wedge (5); A first head receiving groove 211 formed on the lower surface of the connecting plate 2 so that the head 31 of the first fixing bolt 3 is accommodated in the connecting plate 2 and the first head receiving It communicates with the groove 211 and allows the body 32 of the first fixing bolt 3 to pass therethrough. A second head accommodating groove formed on the upper surface of the connection plate 2 to accommodate the first bolt fastening part 21 and the head 41 of the second fixing bolt 4 to be opened to the outside of the connection plate 2 . (221) and the second bolt fastening portion 22 communicated with the second head receiving groove 221 and composed of a second through hole 222 through which the head 41 of the second fixing bolt 4 penetrates. Alternately formed, the head 31 of the first fixing bolt 3 is closely fixed to the bottom surface of the first head receiving groove 211, and the head 41 of the second fixing bolt 4 is the second head The fixing wedge 5 inserted into the inside of the second head receiving groove 221 through the open front surface of the second head receiving groove 221 in the state inserted into the receiving groove 221 is the second fixing bolt ( It is characterized in that the second fixing bolt (4) is fixed by being caught on the lower part of the head (41) of 4).

The present invention minimizes the size of the connector at the time of joining the upper and lower PHC piles (1a, 1b) to provide a PHC pile connector with excellent economic feasibility, quick and easy pile joint construction, and excellent structural stability, and a PHC pile connecting method using the same will be.

Here, 'upper' and 'lower' are separated for convenience of description, and do not necessarily mean upper and lower portions of the PHC files 1a and 1b. Accordingly, it may be understood that the upper PHC file 1a means one PHC file, and the lower PHC file 1b means the other PHC file.

The present invention PHC pile connector is configured to include a connection plate (2), a first fixing bolt (3) and a second fixing bolt (4).

The connecting plate 2 is formed to have a shape corresponding to the shape of the end of the PHC piles 1a and 1b to be joined.

The connection plate 2 can be formed in a ring plate shape with a thin thickness to correspond to the end shape of the PHC piles 1a and 1b.

The upper surface of the connection plate 2 is in close contact with the lower end of the upper PHC pile 1a, and the lower surface is in close contact with the upper end of the lower PHC pile 1b.

The connection plate 2 is fixed to the upper PHC pile 1a and the lower PHC pile 1b with a plurality of first fixing bolts 3 and second fixing bolts 4, respectively.

The first fixing bolt 3 and the second fixing bolt 4 are composed of heads 31 and 41 and bodies 32 and 42, respectively.

The first fixing bolt 3 fixes the connection plate 2 to the upper PHC pile 1a, and the second fixing bolt 4 fixes the connection plate 2 to the lower PHC pile 1b.

The first fixing bolt 3 and the second fixing bolt 4 can be screwed into the PC nut or the end plate tapped hole at the ends of the PHC piles 1a and 1b.

The heads 31 and 41 of the first fixing bolt 3 and the second fixing bolt 4 may be hexagonal or circular, and in the case of the second fixing bolt 4, the It is preferable that the head 41 is circular in order to reduce play.

In the connection plate 2, a first bolt fastening part 21 to which the first fixing bolt 3 is coupled and a second bolt fastening part 22 to which the second fixing bolt 4 is coupled are alternately formed. .

2 and 4, the first bolt fastening portion 21 has a first head receiving groove formed on the lower surface of the connecting plate 2 so that the head 31 of the first fixing bolt 3 is accommodated. It communicates with the 211 and the first head receiving groove 211 and is composed of a first through hole 212 through which the body 32 of the first fixing bolt 3 passes.

The first through hole 212 is formed to have a width smaller than the head 31 of the first fixing bolt 3 , so that the head 31 is caught on the bottom surface of the first head receiving groove 211 .

The connection plate 2 is first fixed to the lower end of the upper PHC pile 1a by a first fixing bolt 3 .

The head 31 of the first fixing bolt 3 is closely fixed to the bottom surface of the first head receiving groove 211 .

The second fixing bolt 4 is bolted to the upper surface of the lower PHC pile 1b separately from the connection plate 2 .

At this time, the head 41 of the second fixing bolt 4 is fastened to be spaced apart from the upper surface of the lower PHC pile 1b by a predetermined height (FIG. 5(a)).

As shown in FIGS. 3 and 5 , the second bolt fastening part 22 to which the second fixing bolt 4 is coupled is a second through hole through which the head 41 of the second fixing bolt 4 passes. It is composed of a second head receiving groove 221 formed on the upper surface of the connection plate 2 so that the head 41 of the second fixing bolt 4 penetrated through the 222 and the second through hole 222 is accommodated. .

To this end, the second through hole 222 is formed in a circular shape, a slot type, or a slot type with one side open in plan view. In this case, the second through hole 222 is the head 41 of the second fixing bolt 4 . wider than that.

At this time, a stepped portion 225 is formed in the lower portion of the second head receiving groove 221, and the lower surface of the head 41 of the second fixing bolt 4 is spaced apart from the bottom surface of the stepped portion 225 by a predetermined distance ( Figure 5 (b)).

The second head receiving groove 221 is opened to the outside of the connection plate (2). In a state in which the head 41 of the second fixing bolt 4 is inserted into the second head receiving groove 221, the second fixing bolt ( 4) A fixing wedge 5 is inserted between the lower surface of the head 41 and the space spaced apart from the lower surface of the second head receiving groove 221 .

The fixing wedge 5 is caught on the bottom of the second head receiving groove 221 so that the head 41 of the second fixing bolt 4 does not fall into the second through hole 222 (FIG. 5 (c)). ).

That is, the fixing wedge 5 is caught on the lower part of the head 41 of the second fixing bolt 4 and the second fixing bolt 4 is fixed.

The tip of the fixing wedge 5 has a thin thickness so that the fixing wedge 5 can be easily inserted between the head 41 of the second fixing bolt 4 and the bottom surface of the second head receiving groove 221 it is preferable

A process in which the connection plate 2 is coupled to the upper portion of the lower PHC pile 1b by the second fixing bolt 4 will be described with reference to FIG. 5 .

First, the connection plate 2 is lowered from the upper part of the lower PHC pile 1b to which the second fixing bolt 4 is fastened to the upper surface as shown in FIG. 5 (a). Here, the connection plate 2 is already coupled to the lower surface of the upper PHC pile 1a by the first fixing bolt 3 .

Next, after passing through the second through hole 222 provided in the second bolt fastening part 22 of the connection plate 2, the second fixing bolt 4 passes through the second fixing bolt 4 as shown in FIG. 2 The fixing wedge 5 is inserted between the head 41 of the fixing bolt 4 and the bottom of the second head receiving groove 221 to connect the upper and lower PHC files 1a and 1b.

Accordingly, as shown in FIG. 5 (c), the fixing wedge 5 is caught on the bottom surface of the second head receiving groove 221, so the head 41 of the second fixing bolt 4 is connected to the second through hole ( 222) and is fixed without falling out.

In the conventional PHC pile connector, the connector was bolted to the lower PHC pile while the connector was fixed to the lower end of the upper PHC pile hung on the lifting equipment. Accordingly, the operation was very cumbersome, and there was a disadvantage of a large load burden. On the other hand, in the present invention, the fixing bolts 3 and 4 are fastened to the ends of the PHC piles 1a, 1b in advance before connecting the upper and lower PHC piles 1a and 1b to each other, so the fixing bolt fastening operation is very easy, and without a welding process It can be easily connected.

In addition, since the stress is transmitted directly by the acupressure of the connecting plate 2 formed in the same shape as the cross section of the PHC piles 1a and 1b, the acupressure stress distribution is very uniform, there is no stress concentration, there is no risk of buckling, and the proof strength is very Full strength can be utilized even when using a large high-strength PHC file.

In addition, since the connection plate 2, which is the main member of the PHC pile connector of the present invention, is formed in the shape of a thin ring plate, it can be precisely manufactured by casting without welding, etc., and material management is easy due to the small number of members. It is economical because discretion can be minimized.

As shown in FIG. 3 , a chamfer 223 may be formed at the lower inlet of the second through hole 222 .

For stable support of the second fixing bolt 4 by the fixing wedge 5, the width of the second through hole 222 is preferably formed as minimal as possible.

However, in the state where the connection plate 2 is fixed at the bottom, the upper PHC pile 1a suspended from the lifting equipment is lowered and the second fixing bolt 4 is inserted into the second through hole 222 of the lower surface of the connection plate 2 Since it should be inserted, if there is no play between the width of the second through hole 222 and the width of the second fixing bolt 4 head 41, the second fixing bolt 4 enters into the second through hole 222. it becomes difficult to do

Accordingly, the lower entrance of the second through hole 222 is enlarged so that the head 41 of the second fixing bolt 4 can easily enter the second through hole 222 to form a chamfer 223 at the lower edge. can do.

5, the shank 421 of the body 42 of the second fixing bolt 4 has a larger diameter than the screw portion 422, and the upper surface of the lower PHC pile 1b and the shank 421 are formed. A washer plate 6 for adjusting the height of the second fixing bolt 4 head 41 may be provided therebetween.

The present invention PHC pile connector inserts and fixes the fixing wedge 5 between the head 41 and the second head receiving groove 221 of the second fixing bolt 4, so the head of the second fixing bolt 4 ( 41) If the height is not maintained accurately, it may be difficult to secure a firm fixation.

Accordingly, it is necessary to maintain a constant length of the second fixing bolt 4 protruding to the upper end of the lower PHC pile 1b.

To this end, the diameter of the shank 421, shank portion of the body 42 of the second fixing bolt 4 is enlarged to form a larger diameter than the screw portion 422. By intervening, it is possible to accurately match the fastening depth of the second fixing bolt 4 to maintain a constant protrusion height of the second fixing bolt 4 .

6 is a perspective view showing a fixed wedge, FIG. 7 is a plan view showing a state in which the fixed wedge is coupled, and FIG. 8 is a cross-sectional view showing a portion C-C' of FIG.

As shown in Figures 6 to 8, the fixing wedge 5 is a pair of spaced apart in the width direction the rear end of the fixing piece 51 and the fixing piece 51 between which an insertion groove 53 is formed therebetween. It may be formed in a U-shape in plan view by being composed of a connecting portion 52 that connects.

The fixing wedge 5 can be configured to support the head 41 of the second fixing bolt 4 by inserting separate fixing pieces 51 on the left and right sides of the body 42 of the second fixing bolt 4, respectively. have.

Alternatively, the fixing wedge 5 may be formed in a U-shaped planar shape for stable insertion and support.

The fixing wedge 5 is the rear end of the fixing wedge 5 in a state in which the front end of the fixing piece 51 is inserted between the head 41 of the second fixing bolt 4 and the bottom surface of the second head receiving groove 221 . It can be completely inserted into the second head receiving groove 221 by hitting the outside of the connecting portion 52 of the tool or the like.

It is preferable that the outer surface of the connecting portion 52 is processed to be positioned on the same surface as the outer surface of the connecting plate 2 so that there is no portion protruding to the outside in a state in which the fixing wedge 5 is inserted.

When the fixing wedge 5 is inserted, the insertion groove 53 is the same as the body 42 of the second fixing bolt 4 so that the second fixing bolt 4 does not flow in the connection plate 2 . formed, and the outer surface of the fixing wedge 5 may be configured to be in close contact with the inner surface of the second head receiving groove 221 .

7, the insertion groove 53 has an inlet width of the insertion groove 53 so that the body 42 of the second fixing bolt 4 is pressed into the body of the second fixing bolt 4 ( 42) It can be formed smaller than the diameter.

In order to prevent the fixing wedge 5 from falling out after the fixing wedge 5 is inserted, the inlet width of the insertion groove 53 may be formed smaller than the diameter of the body 42 of the second fixing bolt 4 .

Accordingly, when the fixing wedge (5) is inserted, both sides of the fixing pieces (51) are slightly spread apart due to the elasticity of the fixing wedge (5), and after the insertion of the fixing wedge (5) is completed, the fixing pieces (51) are again By returning to the original position and caught on the body 42 of the second fixing bolt 4, the fixing wedge 5 can be fixed without being separated.

In order to absorb the elastic deformation generated when the fixing wedge 5 is inserted, the outer surface of the fixing piece 51 of the fixing wedge 5 at the position where the fixing wedge 5 is opened and the second head receiving groove ( A predetermined gap Δ may be formed between the inner surfaces of the 221 .

It is preferable that the width of the entry part 54 in front of the entrance of the insertion groove 53 is formed to be wider toward the outside so that the body 42 of the second fixing bolt 4 can easily enter.

9 is a perspective view showing the upper and lower PHC piles coupled by the PHC pile connector of the present invention.

6, 9, etc., at the rear end of the upper surface of the connection part 52 of the fixing wedge 5, a blocking protrusion 55 for closing the open entrance of the second head receiving groove 221 is formed to protrude. can

Since the thickness of the fixing wedge 5 is the same as the distance between the lower surface of the head 41 of the second fixing bolt 4 and the bottom surface of the second head receiving groove 221 , the total thickness of the second head receiving groove 221 . thinner than Accordingly, when the fixing wedge 5 is inserted and fixed in the second head receiving groove 221 , a space is formed on the upper surface of the fixing wedge 5 , and foreign substances may penetrate into this space.

Accordingly, in order to prevent foreign substances from entering the inside of the second head receiving groove 221 , a blocking protrusion 55 is formed at the rear end of the upper surface of the connecting portion 52 of the fixing wedge 5 to form the second head receiving groove 221 . Open entrances can be closed.

10 is a perspective view illustrating a connection plate in which a groove portion is formed.

10, the connection plate 2 may form a plurality of grooves 23 to a predetermined depth on the upper surface or the lower surface in order to save the amount of steel.

11 is a perspective view showing the coupling relationship between the fixing wedge and the connecting plate formed with the support protrusion, FIG. 12 is a perspective view showing the coupling state of the embodiment shown in FIG. 11, and FIG. 13 is the second in the embodiment of FIG. It is a cross-sectional view showing a state in which the fixing bolt is coupled.

11 to 13, on the upper surface of the fixing piece 51 outside the head 41 of the second fixing bolt 4, a support protrusion 56 that is in close contact with the lower end of the upper PHC pile 1a. may be formed to protrude.

A support protrusion 56 may be formed to protrude from the upper surface of the fixing piece 51 in order to maximize the pressure area inside the second head receiving groove 221 .

The support protrusion 56 may be configured to be at the same height as the upper surface of the connection plate 2 so as to be in close contact with the lower end of the upper PHC pile 1a.

The support protrusion 56 is formed outside the head 41 of the second fixing bolt 4 so as not to interfere with the second fixing bolt 4 .

The support protrusion 56 may be formed in a shape corresponding to the fixing piece 51, that is, a C-shape.

11 and 12 , the support protrusion 56 may be formed to be connected to the blocking protrusion 55 .

11 to 13 , the upper surface of the stepped portion 225 may be inclined downward toward the second fixing bolt 4 . In this case, it is possible to secure the maximum thickness of the point of the stepped portion 225 in contact with the inner surface of the second head receiving groove 221 to improve the resistance to shear while reducing the thickness of the entire member.

As shown in FIG. 11 , locking grooves 511 are formed on both sides of the fixing wedge 5, and on both sides of the inner side of the second head receiving groove 221, the locking protrusions caught by the locking grooves 511 ( 226) may be formed to protrude.

In another embodiment for preventing the fixing wedge 5 from falling out after the fixing wedge 5 is inserted, a locking groove 511 is formed on the outer surface of the fixing piece 51 of the fixing wedge 5, and the second The locking protrusions 226 to be inserted into the locking grooves 511 and hooked are formed on both inner side surfaces of the head receiving groove 221 , respectively.

When the fixing wedge 5 is inserted into the inside of the second head receiving groove 221 , the fixing pieces 51 on both sides are slightly compressed inward by the elasticity of the fixing wedge 5 . After completing the insertion of the fixing wedge (5), the fixing piece (51) returns to its original position and the locking protrusion (226) is caught in the locking groove (511).

Accordingly, the fixing wedge 5 can be fixed without being separated.

14 is a perspective view illustrating a connection plate in which one side of a second through hole is opened. And Figure 15 is a bottom perspective view showing the coupling relationship between the connecting plate and the fixed wedge according to Fig. 14, Figure 16 is a perspective view showing the coupling state of the connecting plate and the fixed wedge according to Fig. 14, Fig. 17 is of Fig. 14 It is a cross-sectional view showing a state in which the second fixing bolt is coupled in the embodiment.

In addition, FIG. 18 is a perspective view showing the coupling relationship between the connecting plate and the fixing wedge having an inclined upper surface of the stepped portion, and FIG. 19 is a cross-sectional view showing a state in which the second fixing bolt is coupled in the embodiment of FIG. 18 .

14 to 16 , the second through hole 222 may be formed to open to the outside of the connection plate 2 .

When the outside of the second through hole 222 is opened, coupling with the second fixing bolt 4 can be facilitated.

The width of the second through hole 222 is formed to be larger than the head 41 of the second fixing bolt 4 .

When the lower blocking protrusion 57 is formed at the rear end of the lower surface of the connection part 52 of the fixed wedge 5, the lower blocking protrusion 57 closes the open entrance of the second through hole 222, so the second through hole ( 222) it is possible to prevent foreign substances from entering the inside ( FIGS. 15 and 16 ).

In addition, as shown in FIGS. 15 and 17 , on the lower surface of the fixing piece 51 , a C-shaped protrusion inserted into the space between the shank 421 and the second through hole 222 of the second fixing bolt 4 . (58) can be formed to protrude.

The C-shaped protrusion 58 reinforces the fixing piece 51 , stably transmits the load of the second fixing bolt 4 , and prevents the flow of the second fixing bolt 4 .

18 and 19 , even when the outside of the second through hole 222 is opened, the upper surface of the stepped portion 225 may be inclined downward toward the second fixing bolt 4 .

Therefore, the thickness of the point of the stepped portion 225 in contact with the inner surface of the second head receiving groove 221 can be secured as much as possible.

20 is a perspective view showing the coupling relationship of the tapered fixing wedge, and FIG. 21 is a cross-sectional view showing a state in which the second fixing bolt is coupled in the embodiment of FIG. 20 .

20 and 21, both side surfaces of the second head receiving groove 221 are inclined so that the width becomes narrower toward the lower side, and both side surfaces of the fixing wedge 5 are the second head receiving groove ( 221) The inclined surfaces of both sides and corresponding inclined surfaces may be formed to closely support each other.

The inner surface of the second head accommodating groove 221 is cut so that the second head accommodating groove 221 as a whole has an upper and lower narrow shape without separately forming the stepped portion 225 inside the second head accommodating groove 221 . It can be formed with an inclined surface.

In addition, both side surfaces of the fixing wedge 5 may be formed in a tapered shape corresponding to the inner inclined surface of the second head receiving groove 221 .

Accordingly, the fixing wedge 5 inserted into the second head receiving groove 221 is caught on the inclined surface and does not come off to the lower side, and the second fixing bolt 4 can be fixed.

In this case, the opening at the bottom of the second head receiving groove 221 becomes the second through hole 222 .

22 is a bottom perspective view showing a coupling relationship between a connection plate provided with a rail groove and a fixing wedge, and FIG. 23 is a cross-sectional view showing a state in which the second fixing bolt is coupled in the embodiment of FIG.

22 and 23 , rail grooves 224 into which both ends of the fixing wedge 5 are slidably inserted may be formed on both sides of the second head receiving groove 221 .

By forming a rail groove 224 on the inner surface of the second head receiving groove 221 so that the fixing piece 51 of the fixing wedge 5 is inserted into the rail groove 224 and caught, the fixing wedge 5 is fixed. can be fixed

In this case, the second head receiving groove 221 and the second through hole 222 may be formed to have the same width.

In order to facilitate the insertion and sliding movement of the fixing wedge 5, the inner peripheral surface of the rail groove 224 and the outer surface of the fixing piece 51 may be formed to be round.

24 to 27 are diagrams illustrating a step-by-step process for a PHC pile connection method using the PHC pile connector of the present invention.

The method of concatenating PHC files using the PHC file connector of the present invention relates to a method of concatenating PHC files using the PHC file connector of the present invention described above with reference to FIGS. 1 to 23 .

In the PHC pile connection method using the PHC pile connector of the present invention, first, (a) fixing the connection plate 2 with the first fixing bolt 3 at the bottom of the upper PHC pile 1a, while the lower PHC pile 1b) Fasten the second fixing bolt 4 so that the head 41 is spaced apart from the upper surface of the lower PHC pile 1b at the upper end of the .

That is, as in FIG. 24 , by fixing the first fixing bolt 3 to the lower end of the upper PHC pile 1a through the first bolt fastening part 21 of the connection plate 2, the upper PHC pile 1a ) Fix the connection plate (2) at the bottom. At this time, the head 31 of the first fixing bolt 3 is closely fixed to the bottom surface of the first head receiving groove 211 .

And, as shown in FIG. 25, the second fixing bolt 4 is fixed to the upper end of the lower PHC pile 1b so that the protruding length is constant.

Next, (b) lift the upper PHC pile (1a) having the connection plate (2) fixed to the bottom so that the head 41 of the second fixing bolt (4) is connected to the second head receiving groove (2) of the connection plate (2) 221) It is positioned at the top of the lower PHC file (1b) to be inserted inside.

As shown in Figure 26, the upper PHC pile (1a) with the connection plate (2) fixed at the bottom is lifted with a lifting equipment and moved to the upper part of the lower PHC pile (1b), and then the upper PHC pile (1a) is lowered do.

At this time, the second fixing bolt 4 previously fastened to the upper end of the lower PHC pile 1b is inserted into the second through hole 222 of the connection plate 2 .

And (c) inserting the fixing wedge 5 into the lower part of the head 41 of the second fixing bolt 4 through the second head receiving groove 221 to connect the second fixing bolt 4 to the connecting plate 2 ) is fixed to

When the connection plate 2 is in close contact with the upper surface of the lower PHC pile 1b, the fixing wedge 5 is inserted through the second head receiving groove 221 of the connection plate 2 as shown in FIG. The head 41 of the second fixing bolt 4 is fixed by allowing the fixing piece 51 of the fixing wedge 5 to be inserted into the lower part of the head 41 of the second fixing bolt 4 .

Accordingly, the connection of the upper and lower PHC files 1a and 1b is completed.

1a, 1b: PHC file 2: Connection plate
21: first bolt fastening part 211: first head receiving groove
212: first through hole 22: second bolt fastening part
221: second head receiving groove 222: second through hole
223: chamfer 224: rail groove
225: step 226: locking protrusion
23: groove part 3: first fixing bolt
31: head 32: body
4: second fixing bolt 41: head
42: body 421: shank
422: threaded part 5: fixed wedge
51: fixed piece 511: engaging groove
52: connection part 53: insertion groove
54: entry part 55: blocking protrusion
56: support protrusion 57: lower blocking protrusion
58: C-shaped protrusion 6: washer plate

Claims (12)

a connection plate (2) formed in a shape corresponding to the end shape of the PHC pile (1a, 1b) to interconnect the upper and lower PHC piles (1a, 1b); A first fixing bolt (3) consisting of a head (31) and a body (32) for fixing the connection plate (2) to the upper PHC pile (1a); And a second fixing bolt (4) consisting of a head (41) and a body (42) to fix the connection plate (2) to the lower PHC pile (1b) by a fixing wedge (5); which consists of
The first head receiving groove 211 and the first head receiving groove 211 formed on the lower surface of the connecting plate 2 so that the head 31 of the first fixing bolt 3 is accommodated in the connecting plate 2 The first bolt fastening part ( 21) and the second head accommodating groove 221 formed on the upper surface of the connection plate 2 to accommodate the head 41 of the second fixing bolt 4 and open to the outside of the connection plate 2, and the The second bolt fastening portions 22 communicated with the second head receiving groove 221 and composed of a second through hole 222 through which the head 41 of the second fixing bolt 4 penetrates are alternately formed,
The head 31 of the first fixing bolt 3 is closely fixed to the bottom surface of the first head receiving groove 211,
The head 41 of the second fixing bolt 4 is inserted into the second head receiving groove 221 through the open front surface of the second head receiving groove 221 in the second head receiving groove 221 . ) PHC file connector, characterized in that the fixing wedge (5) inserted into the inside is caught on the lower part of the head (41) of the second fixing bolt (4) and the second fixing bolt (4) is fixed.
In claim 1,
A PHC pile connector, characterized in that a chamfer (223) is formed at the lower entrance of the second through hole (222).
In claim 1,
The shank 421 of the body 42 of the second fixing bolt 4 has a larger diameter than the screw portion 422, and between the upper surface of the lower PHC pile 1b and the shank 421 is a second fixing bolt 4 ) PHC pile connector, characterized in that the washer plate (6) for adjusting the height of the head (41) is provided.
In claim 1,
The fixing wedge 5 is composed of a fixing piece 51 in which a pair is spaced apart in the width direction and an insertion groove 53 is formed therebetween, and a connecting part 52 connecting the rear end of the fixing piece 51 in a planar view. PHC pile connector, characterized in that it is formed in a U shape.
In claim 4,
The insertion groove 53 is formed such that the entrance width of the insertion groove 53 is smaller than the diameter of the body 42 of the second fixing bolt 4 so that the body 42 of the second fixing bolt 4 is press-fitted. Characterized by the PHC file connector.
In claim 4,
A PHC pile connector, characterized in that a blocking protrusion (55) for closing the open entrance of the second head receiving groove (221) is protruded from the rear end of the upper surface of the connection part (52) of the fixing wedge (5).
In claim 6,
PHC pile connector, characterized in that the support protrusion 56 that is in close contact with the lower end of the upper PHC pile 1a is protruded from the upper surface of the fixing piece 51 located outside the head 41 of the second fixing bolt 4 .
In claim 1,
Locking grooves 511 are formed on both sides of the fixing wedge 5, and locking protrusions 226 caught in the locking grooves 511 are formed on both inner side surfaces of the second head receiving groove 221 to protrude. to the PHC file connector.
In claim 1,
The second through hole 222 is a PHC pile connector, characterized in that it is formed to be opened to the outside of the connection plate (2).
In claim 9,
Both side surfaces of the second head receiving groove 221 are inclined so that the width becomes narrower toward the bottom, and both sides of the fixing wedge 5 are inclined surfaces corresponding to the inclined surfaces of both sides of the second head receiving groove 221 . PHC pile connector, characterized in that it is closely supported with each other.
In claim 9,
PHC pile connector, characterized in that on both sides of the second head receiving groove (221), rail grooves (224) into which both ends of the fixing wedge (5) are slidably inserted are formed.
It relates to a PHC file connection method using the PHC file connector according to claim 1,
(a) While fixing the connection plate 2 with the first fixing bolt 3 at the lower end of the upper PHC pile 1a, the head 41 on the upper end of the lower PHC pile 1b is attached to the lower PHC pile 1b) Fastening the second fixing bolt (4) so as to be spaced apart from the upper surface of the;
(b) Lifting the upper PHC pile (1a) with the connection plate (2) fixed to the lower end so that the head 41 of the second fixing bolt (4) is inside the second head receiving groove (221) of the connection plate (2) Positioning at the top of the lower PHC file (1b) to be inserted into; and
(c) Insert the fixing wedge 5 into the lower part of the head 41 of the second fixing bolt 4 through the second head receiving groove 221 to connect the second fixing bolt 4 to the connecting plate (2) fastening to; A PHC file connection method using a PHC file connector, characterized in that it consists of.

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