KR102267641B1 - PHC pile construction method using joint PHC pile and detachable auxiliary pile - Google Patents

Abstract

The present invention provides a construction method of a PHC pile using a joining PHC pile and a detachable auxiliary pile which can couple a plurality of auxiliary piles to construct a PHC pile if a construction site is narrow and an excavation depth is deep, insert the PHC pile without damage and collapse of a drilling hole, and guarantee safety without detachment when lifting the PHC pile. According to a proper embodiment of the present invention, the construction method of a PHC pile using a joining PHC pile and a detachable auxiliary pile comprises: (a) a step of fixing and installing a casing guide on the ground, and constructing a drilling hole of a prescribed depth through the casing guide; (b) a step of joining a PHC pile and a joining PHC pile by welding, connecting an auxiliary pile to the PHC pile, and then lifting the auxiliary pile to pass through the casing guide to insert the PHC pile into the drilling hole; (c) a step of lightly striking the auxiliary pile and then inserting a steel frame column through the auxiliary pile to support the steel frame column on the joining PHC pile; (d) a step of injecting a filling material into the joining PHC pile to combine the steel frame column with the joining PHC pile; and (e) a step of detaching and drawing the auxiliary pile from the joining PHC pile after the filling material is cured, and backfilling the drilling hole with soil.

Description

Construction method of PHC pile using joint PHC pile and detachable auxiliary port {PHC pile construction method using joint PHC pile and detachable auxiliary pile}

The present invention relates to a method of constructing a PHC pile from the ground to a required depth. In particular, a PHC pile can be constructed without limiting the depth of excavation by allowing a plurality of auxiliary terms to be combined, and the PHC pile can be constructed without collapse and damage of the drilling hole. It relates to a construction method of a PHC pile for joints and a PHC pile using a detachable auxiliary port, which allows penetration and ensures safety without separation when the PHC pile is lifted.

When it is difficult to occupy the adjacent land and excavate to a depth of 3 or more stories underground, the steel brace method must first construct a PHC pile due to the interference of the brace and then excavate it while cutting the pile. After constructing the pillar part foundation pile for reverse drilling using the PRD, RCD, BARRETTE method, etc., install the steel frame (including the reinforcing bar mesh) in the deep part and pour the concrete. while proceeding with the construction.

In the case of pre-construction of PHC piles on the ground, in order to prevent loss of PHC piles, after dropping the PHC piles to a predetermined position by free fall, the existing auxiliary ports are mounted on the PHC piles and the piles are constructed by hitting them with a hammer. This has a disadvantage in that the construction proceeds in a state that is not integrated with the PHC pile, and the reliability of driving energy transmission and bearing capacity confirmation is lowered, and longitudinal cracks of the PHC pile are generated due to eccentricity during driving. In addition, if an existing auxiliary port needs to be used at the site, a dynamic load test is performed by extending the PHC pile to the upper part, and the main construction company uses the existing auxiliary port after free-falling the PHC pile to a predetermined depth. Since the construction conditions of the construction are different from those of the main construction, if the pile construction is performed according to the quality standards set by the city, serious problems such as subsidence of the building foundation and repair and reinforcement construction costs due to longitudinal cracks may occur.

As the background technology of the present invention, there is Korean Patent Publication No. 2016-0053432 "Auxiliary pile construction method and pile assembly used therein" (Patent Document 1). In the background art, 'perforating step of forming a drilling hole; The intermediate member is coupled to the upper part of the lower pile, and the auxiliary pile member is temporarily coupled to the upper part of the intermediate member to manufacture a pile assembly, wherein the cross-sectional center of the lower pile and the cross-sectional center of the auxiliary pile member are located on the same line. Assembly manufacturing step to be temporarily fixed in the state; Assembly installation step of inserting the pile assembly into the drilling hole; Reinforcing the lower end of the pile assembly by driving the auxiliary pile member into the drilling hole; An auxiliary pile removing step of removing the auxiliary pile member from the intermediate member and removing it from the drilling hole; proposes 'auxiliary pile construction method comprising a.

However, the background technology has a problem in that the reliability of the driving energy transmission and bearing capacity confirmation is lowered because the workability is lowered due to the need for an intermediate member for the connection, and it is uneconomical and the integrated construction is not performed.

As another technology that is the background of the present invention to solve this problem, as Korea Patent Registration No. 10-1766165, 'a method for constructing a pile for back hitting using a detachable auxiliary term and a reverse punching method using the same' (Patent Document 2) is proposed. has been In the reverse drilling method, the large-diameter PHC pile that supports the working load and the structural load of the basement floor is connected and constructed by connecting the detachable auxiliary port, and the steel column is inserted into the removable auxiliary port to connect it with the PHC pile, and then excavation work is carried out in the reverse rudder section. This is to greatly reduce the construction cost of the pile.

However, in the background art, the PHC pile is lifted and inserted into the drilling hole, the steel frame is mounted on the upper PHC pile, and the inside of the upper PHC pile is filled with cement concrete or grout material and cured. There is a high probability that the center of gravity position will deviate. In addition, when the PHC pile is salvaged, the risk of installation work increases due to the separation of the auxiliary port and the PHC pile, which may harm safety. In addition, there is a disadvantage that the installation depth of the PHC file is limited because the auxiliary term is a single unit.

Korean Patent Publication No. 2016-0053432 Korean Patent Registration No. 10-1766165

In the present invention, when a PHC pile needs to be constructed on the ground by allowing a plurality of auxiliary terms to be combined, the PHC pile can be installed at a predetermined position even when the depth of excavation is deep, and the PHC pile can be placed in the correct position to minimize the core error. The purpose of this is to provide a PHC pile construction method using a PHC pile for joints and a detachable auxiliary port to ensure safety without separation when lifting the PHC pile.

The construction method of a PHC pile for joints and a PHC pile using a removable auxiliary term according to an appropriate embodiment of the present invention includes the steps of (a) fixing a casing guide to the ground, and constructing a drilling hole of a certain depth through the casing guide; ; (b) joining the PHC pile and the PHC pile for the joint by welding, connecting the auxiliary term to the PHC file for the joint, and lifting it, inserting the inside of the casing guide and inserting the PHC file into the drilling hole; (c) after hitting the auxiliary port, inserting a steel column through the inside of the auxiliary port to support the PHC pile for joint; (d) injecting or pouring filler into the PHC pile for joints, and synthesizing the steel columns into the PHC pile for joints; (e) after curing the filler, dismantling and drawing the auxiliary term from the PHC pile for joints, fixing the upper part of the steel column to the casing guide so as not to move during backfilling, and backfilling the hole; characterized in that it includes.

In addition, in step (a), the casing guide has an inner diameter of the same size as the guide hole on the upper surface of the casing support steel plate and the casing support steel plate having a guide hole slightly larger than the outer diameter of the casing for drilling and the outer diameter of the tip of the casing, and is concentrically axial. It is characterized in that it includes a guide casing in which a plurality of lifting holes are formed, and a plurality of fixed piles for ground penetration that are installed on the lower surface of the casing support steel plate to fix the casing guide to the ground.

In addition, in step (b), a plurality of auxiliary terms are coupled and installed, and in the coupling portion between adjacent auxiliary terms, the auxiliary term coupling key on one side is inserted into the auxiliary term key coupling groove on the other side, and then the auxiliary term coupling key side bolt is inserted It is characterized in that the auxiliary term connection bolt is inserted into the hole and is screwed into the auxiliary term key coupling groove side fastening screw hole.

In addition, in step (b), the auxiliary term has an auxiliary term connection plate at the bottom, and high tension bolt fastening slots arranged in the circumferential direction at regular intervals are formed on the auxiliary term connecting plate, and the high tension bolt fastening slot is PHC for joints The drilling slot portion into which the pile side high tension bolt is inserted and the fixed slot portion having a width smaller than the width of the expansion slot portion and communicating with each other to connect and fix the head of the high tension bolt, but in the section of the outer peripheral surface of the auxiliary port connection plate in which the fixing slot portion is formed, the high tension bolt It is characterized in that a fastening hole for coupling the safety pin is formed in order to couple the lifting safety pin to prevent loosening.

In addition, in the step (b), a plurality of auxiliary terms are coupled and installed, and in the coupling part between adjacent auxiliary terms, the upper coupling ring is coupled to the upper auxiliary term and fixed by welding, and the lower coupling ring is fixed by welding to the lower auxiliary term. After these are positioned to face each other, a plurality of split segments for joints are arranged in a circular arrangement on the outer peripheral surfaces of the upper coupling ring and the lower coupling ring, and are respectively fastened to the upper coupling ring and the lower coupling ring with bolts.

According to the construction method of the PHC pile using the PHC pile for joints and the detachable auxiliary term of the present invention, the PHC pile can be constructed without limitation of the depth of excavation by configuring so that a plurality of auxiliary terms can be combined. In addition, since the casing guide is installed and construction is performed, the PHC pile can be penetrated into the correct position to minimize the core-center error of the PHC pile, and the safety pin is used in the auxiliary port to ensure the safety without deviation when the PHC pile is lifted.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited to the matters described in the accompanying drawings It should not be construed as being limited.
1A to 1H are flowcharts of a PHC pile construction method using a PHC pile for joints and a removable auxiliary term according to an embodiment of the present invention.
Figure 2 is a perspective view of the casing guide applied to the present invention.
Figure 3a is a perspective view showing one form of a removable auxiliary term applied to the present invention.
Fig. 3b is a longitudinal sectional view of Fig. 3a;
Fig. 3c is a plan view of Fig. 3b;
Fig. 3D is a bottom view of Fig. 3B;
Figure 4a is a perspective view of the coupling between the removable auxiliary port shown in Figure 3a.
Figure 4b is a coupling state diagram sequentially showing the coupling operation between the removable auxiliary term shown in Figure 3a.
Figure 5a is a cross-sectional view of the lower end of the removable auxiliary term applied to the present invention.
Figure 5b is a bottom view of the auxiliary term connecting plate shown in Figure 5a.
Figure 6a is a perspective view of another coupling part between the auxiliary claims applied to the present invention.
Figure 6b is an exploded view of the split segment for the upper and lower coupling rings and joints in the auxiliary claim shown in Figure 6a.
Figure 6c is a longitudinal cross-sectional view of the coupling portion between the auxiliary terms shown in Figure 6a.
Fig. 6d is a plan cross-sectional view taken along line KK of Fig. 6c;

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto.

Installation and drilling of the casing guide (20)

First, after the casing guide 20 is installed in the ground 10 , the drilling hole 11 drilled to a predetermined depth through the casing guide 20 is constructed. The casing guide 20 improves the construction quality by guiding the insertion position of the PHC pile 30 (shown in FIG. 1B ) to be installed in the casing and the drilling hole 11 used for casing drilling.

As shown in FIG. 2, the casing guide 20 is a casing support steel plate 201 having a guide hole 201a having a slightly larger outer diameter or casing tip bit beam, and a guide hole 201a on the upper surface of the casing support steel plate 201. ), the guide casing 202 having an inner diameter of the same size as the concentric axis, and having a plurality of lifting holes 202a formed therein, is installed on the lower surface of the casing support steel plate 201, and the casing guide 20 is installed in the ground. It is configured to include a fixed pile 203 for ground penetration fixed to the.

In this way, the casing guide 20 is firmly fixed to the set position through the fixed pile 203 for ground penetration, so that the central axis of the drilling hole 11 and the central axis of the guide casing 202 are always aligned with the PHC file that is post-constructed After the position of (30) becomes accurate, the steel frame for the reverse drilling method is mounted and cured inside the upper PHC pile 40 for joints, the auxiliary port 50 is drawn out, and the steel frame is backfilled by fixing the upper part of the steel frame to the casing guide 20. can prevent core movement.

Bonding of the PHC pile (40) for joints and the coupling and lifting of the auxiliary term (50)

Next, the PHC pile 30 and the PHC pile 40 for joints are joined by welding in a service hole not shown as in FIG. 1B . The service hole is a hole drilled more than one place in the ground 10 to facilitate the coupling between the PHC pile 30 and the PHC pile 40 for the joint and the coupling between the PHC pile 40 and the auxiliary term 50 for the joint. .

As shown in Fig. 1b, the PHC pile 40 for joints has a connection steel plate 41 installed at its lower portion and joined to the upper end of the PHC pile 30 by full perimeter welding, and a high tension bolt 42 is installed thereon. has

Thereafter, as shown in FIG. 1b , the auxiliary term 50 is connected to the PHC pile 40 for jointing, and then the casing guide 20 is inserted and the PHC pile 30 is inserted into the drilling hole 11 .

Here, as shown in FIGS. 3 and 4 , when the installation depth of the PHC pile 30 is deep, a plurality of auxiliary terms 50 may be combined and installed. At this time, in the coupling portion between the adjacent auxiliary terms (50 and 50), the auxiliary term coupling key 503 on one side is inserted into the auxiliary term key coupling groove 501 on the other side, and then the auxiliary term coupling key 503 side bolt insertion hole 504. The auxiliary term connection bolt 510 is inserted and is screwed into the auxiliary term key coupling groove 501 side fastening screw hole 502 . At this time, the auxiliary term key coupling groove 501 is formed to be equal to or deeper than the height of the head of the auxiliary term connection bolt 510, so that after the auxiliary term connection bolt 510 is fastened, it does not protrude to the outer peripheral surface of the auxiliary term 50.

Accordingly, as shown in FIGS. 3A and 3B , the auxiliary term 50 installed in the middle is formed at a predetermined interval on the outer peripheral surface of one end thereof, and the auxiliary term key coupling groove 501 and the auxiliary term key coupling groove 501 are formed on the side of the fastening screw hole 502 ) is provided, and an auxiliary term coupling key 503 formed at regular intervals in the circumferential direction on the other end surface thereof, and a bolt insertion hole 504 penetrating through each auxiliary term coupling key 503 side are provided.

On the other hand, the auxiliary term 50 located on the lowermost side in this step has an auxiliary term connection plate 52 to be connected to the PHC pile 40 for the joint at the lower portion as shown in FIGS. 5a and 5b. A high tension bolt fastening slot 521 arranged in the circumferential direction at regular intervals is formed in the auxiliary term connection plate 52, and the high tension bolt fastening slot 521 has a high tension bolt 42 on the PHC file 40 side for joints. It has a width w2 smaller than the width w1 of the inserted expansion slot part 521a and the expansion slot part 521a and is in communication with each other and a fixed slot part 521b to which the head of the high tension bolt 42 is connected and fixed. However, in the outer peripheral section of the auxiliary port connection plate 52 in which the fixing slot portion 521b is formed, the safety pin coupling hole 521c is formed to couple the lifting safety pin 54 to prevent the high tension bolt 42 from loosening. have.

Therefore, in this process, the lifting of the PHC pile 30 may be fastened to the safety pin coupling hole 521c of the auxiliary port 50 in the form of a screw for the lifting safety pin 54 .

Here, it is preferable that a driving cushion material (not shown) is installed on the auxiliary port connection plate 52 to suppress driving noise and prevent damage to the head of the PHC pile due to driving impact.

Installation of light and steel pillars (60) of the auxiliary port (50)

Then, as shown in FIG. 1c, after hitting the auxiliary term 50 so that the PHC pile 30 penetrates the supporting ground, as shown in FIG. 1d, the steel column 60 is inserted through the auxiliary term 50, as shown in FIG. It is supported on the pile (40).

Synthesis of steel column (60) and PHC pile (40) for joints

Then, as shown in FIG. 1e, the filler 70 is injected into the PHC pile 40 for joints, and the steel column 60 is synthesized in the PHC pile 40 for joints. The filler 70 may be mortar or grout.

Dismantling, drawing and backfilling of auxiliary term (50)

Next, as in FIG. 1f , after curing the filler 70 , the auxiliary term 50 is disassembled and drawn from the PHC pile 40 for joints, and the hole backfilling is performed with earth and sand in the drilling hole 11 as shown in FIG. 1g .

According to this sequential construction sequence, the PHC pile 20 is located at each planned position on the construction site, and is supported on the support layer in a state embedded in the construction site.

After that, when the construction of the PHC pile 30 is completed on the construction site, excavation is performed until the excavation is reached as shown in FIG. 1h , and then the foundation 200 is constructed at the lower end of the PHC pile 30 , and then the The slab 210 is sequentially constructed upwards.

According to this construction method, even when the construction site is narrow and the excavation depth is deep, the PHC pile 30 can be lowered from the ground to the required depth for construction. In addition, after excavation, a reverse drilling method capable of constructing a slab along the height direction of the steel column 60 is possible. In addition, by using the casing guide 20, it is possible to penetrate the PHC pile 30 into the correct position without collapse and damage of the perforation hole 11.

In addition, when the auxiliary port 50 is lifted, separation and separation of the PHC pile 40 for joints by the lifting safety pin 54 is prevented, so that construction safety is improved.

On the other hand, in the present invention, a plurality of auxiliary terms 50 are coupled and installed as shown in FIGS. 6a to 6d in the bonding step of the PHC pile 40 for joints and the coupling of the auxiliary terms 50, and adjacent auxiliary terms 50 and 50 ), the upper coupling ring 55A coupled to the upper auxiliary term 50 and fixed by welding and the lower coupling ring 55B which is coupled to the lower auxiliary term 50 and fixed by welding are positioned so as to face each other, and then the upper On the outer peripheral surfaces of the coupling ring (55A) and the lower coupling ring (55B), a plurality of split segments (57) for the joint are arranged in a circular shape, so that the upper coupling ring (55A) and the lower coupling ring (55B) are respectively bolted (59A, 59B) It can be constructed and fastened with

The upper coupling ring (55A) and the lower coupling ring (55B) are made of steel and have the same structure and have a circular coupling jaw 551 to be coupled to the inner circumferential surface of the auxiliary term (50). In addition, the upper coupling ring 55A and the lower coupling ring 55B have a circularly arranged screw hole 552 for screwing the bolts 59A and 59B on the outer circumferential surface. The divided segment 57 for the joint is made of steel. The joint segment 57 has an arc-shaped structure having the same radius of curvature as the outer circumferential surface of the upper coupling ring 55A or the lower coupling ring 55B, the radius of curvature of the inner circumferential surface. In this embodiment, three of the divided segments 57 for the joint are combined to form a circle, but two or three or more may be combined.

As described above, since the divided segment 57 for the joint has an arc-shaped structure, it is possible to obtain the effect of being automatically formed on one central axis when the auxiliary terms 50 and 50 are combined.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art can make various modifications and modified inventions without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The present invention is not limited by such variations and modifications, but only by the claims appended hereto.

20: casing guide
30: PHC file
40: PHC file for joint
50: auxiliary term
60: steel column

Claims (5)

(a) fixing the casing guide 20 to the ground 10, and constructing a drilling hole 11 of a certain depth through the casing guide 20;
(b) The PHC pile 30 and the PHC pile 40 for joints are joined by welding, and the auxiliary term 50 is connected to the PHC file 40 for joints and then lifted and the inside of the casing guide 20 is inserted. and inserting the PHC pile 30 into the perforation hole 11 by making it;
(c) after hitting the auxiliary port (50), inserting the steel column (60) through the auxiliary port (50) and placing it on the PHC file (40) for joints;
(d) injecting or pouring the filler 70 into the PHC pile 40 for the joint, and synthesizing the steel column 60 to the PHC pile 40 for the joint;
(e) After curing the filler 70, the auxiliary port 50 is dismantled from the PHC pile 40 for joints, and the upper part of the steel column 60 is fixed to the casing guide 20 so as not to move during backfilling, and the backfilling is performed. including;
In the step (a), the casing guide 20 is a casing support steel plate 201 having a guide hole 201a slightly larger than the outer diameter of the casing for drilling and the outer diameter of the tip of the casing, and a guide hole on the upper surface of the casing support steel plate 201 The guide casing 202 having the same size as the inner diameter of (201a), erected concentrically, and provided with a plurality of lifting holes 202a, is installed in a plurality on the lower surface of the casing support steel plate 201, and the casing guide 20 Includes a fixed pile 203 for ground penetration for fixing the to the ground,
In the step (b), the auxiliary term 50 has an auxiliary term connection plate 52 at the lower portion, and high tension bolt fastening slots 521 arranged in the circumferential direction at regular intervals are formed in the auxiliary term connection plate 52. There is, the high tension bolt fastening slot 521 has a width (w2) smaller than the width (w1) of the drilling slot part 521a and the drilling slot part 521a into which the high tension bolt 42 on the side of the PHC pile 40 side for the joint is inserted. and a fixed slot portion 521b that communicates with each other to connect and fix the head portion of the high tension bolt 42, but the auxiliary port connection plate 52 in which the fixed slot portion 521b is formed. Loosening of the high tension bolt 42 A method of constructing a PHC pile using a PHC pile for joints and a detachable auxiliary port, characterized in that a fastening hole 521c for coupling a safety pin is formed in order to couple the lifting safety pin 54 for preventing delete The method of claim 1,
In the step (b), a plurality of sub-terms 50 are coupled and installed, and in the coupling portion between the adjacent sub-terms 50 and 50, one sub-term coupling key 503 is provided on the other side, and the other sub-term key coupling groove 501. After being inserted into, the auxiliary term connection bolt 510 is inserted into the auxiliary term coupling key 503 side bolt insertion hole 504 and screwed into the auxiliary term key coupling groove 501 side fastening screw hole 502, characterized in that Construction method of PHC pile for joint and PHC pile using detachable auxiliary term. delete The method of claim 1,
In the step (b), a plurality of auxiliary terms 50 are coupled and installed, and at the coupling portion between adjacent auxiliary terms 50 and 50, the upper coupling ring 55A is coupled to the upper auxiliary term 50 and fixed by welding; After the lower coupling ring 55B coupled to the lower auxiliary term 50 and fixed by welding is positioned to face each other, the split segment 57 for the joint is located on the outer peripheral surface of the upper coupling ring 55A and the lower coupling ring 55B. A method of constructing a PHC pile using a PHC file for joints and a detachable auxiliary term, characterized in that a plurality of or more are arranged in a circle and are respectively fastened to the upper coupling ring (55A) and the lower coupling ring (55B) with bolts (59A, 59B).

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