KR102268120B1 - PHC pile construction method using casing guide and removeable auxiliary pile - Google Patents

Abstract

The present invention relates to a method of constructing a PHC pile using a casing guide and a detachable auxiliary pile, capable of constructing a PHC pile by lowering the pile deeply from the ground up to a required depth through the combination of a plurality of auxiliary piles; enabling a top-down method for constructing a slab in a height direction of a steel-frame pillar after excavation; intruding a PHC pile into its regular position through a casing guide without causing the collapse and damage of a drilling hole; and improving construction safety by preventing the separation and displacement of a PHC pile for connection through a lifting safety pin when lifting up auxiliary piles. In accordance with a proper embodiment of the present invention, the method of constructing a PHC pile using a casing guide and a detachable auxiliary pile includes the following steps of: (a) installing a casing guide fixed to the ground, and constructing a drilling hole of a predetermined depth through the casing guide; (b) connecting a PHC pile with an auxiliary pile, and then, lifting up the same to insert the casing guide to embed the PHC pile into the drilling hole; (c) tipping the auxiliary pile, and then, inserting a steel-frame pillar into the PHC pile through the inside of the auxiliary pile; (d) injecting a filler into the PHC pile to synthetize the steel-frame pillar with the PHC pile; and (e) dismantling and withdrawing the auxiliary pile from the PHC pile after the filler is cured, and backfilling the drilling hole with soil.

Description

PHC pile construction method using casing guide and removeable auxiliary pile

The present invention relates to a method of constructing a PHC pile from the ground to a required depth. In particular, by combining a plurality of auxiliary terms, the PHC pile can be deeply lowered from the ground to the required depth and constructed, and after excavation, the slab along the height direction of the steel column It is possible to use the reverse drilling method to construct the PHC pile, and by using the casing guide, the PHC pile can be penetrated into the correct position without collapse or damage of the drilling hole, and the separation and separation of the PHC pile for the joint by the lifting safety pin when the auxiliary port is lifted is prevented. It relates to a construction method of a PHC pile using a casing guide and a removable auxiliary port to improve construction safety.

If the site is narrow and the excavation depth is deep, it is difficult for the driving equipment to enter, and the steel brace or reverse drilling method excavates while constructing temporary braces or underground structure slabs step by step. After the PHC pile is pre-constructed on the ground, the pile is cut and excavated.

In this case, to prevent the loss of the PHC pile, the auxiliary port is mounted on the PHC pile and the pile is constructed by hitting it with a hammer. has the disadvantage of falling.

In addition, in case of using auxiliary term at the site, the PHC pile is extended to the upper part and dynamic load test is performed, and the auxiliary term is sometimes used for this work. If pile construction is carried out according to the specified quality standards, serious problems such as subsidence of the building foundation may occur.

As the background technology of the present invention, there is Korean Patent Publication No. 2016-0053432 "Auxiliary pile 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 portion of the lower pile, and the auxiliary pile member is temporarily coupled to the upper portion 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 art 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 the construction is not economical 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 structure 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 excavate it in the reverse rudder section. This is to greatly reduce the construction cost of the pile.

However, in the background art, when the PHC file is lifted and inserted into the perforation hole, the perforation hole is collapsed or damaged, making it difficult to penetrate the PHC file. In addition, when the PHC pile is lifted, the risk of installation work increases due to the separation of the auxiliary port and the PHC pile, which may impair safety. In addition, there is a disadvantage in that the installation depth of the PHC file is limited because the auxiliary clause is a single unit.

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

The present invention is capable of constructing a PHC pile deep from the ground to the required depth by combining a plurality of auxiliary ports, and a reverse drilling method capable of constructing a slab along the height direction of a steel column after excavation is possible, and using a casing guide PHC pile using a casing guide and detachable auxiliary port that allows the PHC pile to penetrate into the correct position without collapse or damage of the drilling hole, and prevents separation and separation of the PHC pile for joints by the lifting safety pin when the auxiliary port is lifted, thereby improving construction safety The purpose is to provide a construction method of

A method of constructing a PHC pile using a casing guide and a removable auxiliary term according to an appropriate embodiment of the present invention comprises the steps of (a) fixing the casing guide to the ground, and constructing a drilling hole of a certain depth through the casing guide; (b) connecting the PHC pile and the auxiliary port in the service hole, lifting the casing guide, and inserting the PHC pile into the drilling hole; (c) after hitting the auxiliary term so that the PHC pile penetrates the supporting ground, inserting a steel column into the PHC pile through the inside of the auxiliary term; (d) injecting a filler into the PHC pile and synthesizing the steel column into the PHC pile; (e) dismantling and drawing the auxiliary term from the PHC pile after curing of the filler, and backfilling the hole with earth and sand in the drilling hole; characterized in that it comprises a.

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 equal to or larger than the outer diameter of the PHC pile, and is installed concentrically. 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 the step (b), a plurality of sub-terms are coupled and installed, and the combination of adjacent sub-terms is performed after the sub-term coupling key is inserted into the sub-term key coupling groove, and then the sub-term connecting bolt is inserted into the sub-term coupling key side bolt insertion hole. It is characterized in that it is made by inserting a screw into the fastening screw hole on the side of the auxiliary key coupling groove side.

In addition, in the 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 connection plate, and the high tension bolt fastening slot has a PHC pile side The expansion part into which the high tension bolt is inserted and a connection fixing part having a width smaller than the width of the expansion part and communicating with each other to connect and fix the head part of the high tension bolt are provided. In order to prevent it, it is characterized in that a screw hole for fastening the safety pin is formed for fastening the safety prevention pin.

In addition, in the step (b), the auxiliary term is characterized in that a centering choke having a conical guide matching the central axis with the PHC pile is further installed at the lower end thereof.

In addition, in the step (b), the PHC pile is positioned to face each other at the top thereof, has a lifting hole, and a pair of double lifting centering plates are further installed to align the concentric axis when combined with the auxiliary port. .

In addition, in the step (c), the lower end of the steel column is characterized in that it is installed down to the inner floor of the PHC pile.

In addition, in the step (c), the lower end of the steel column is installed to rise by a certain height from the inner floor of the PHC pile, and a plurality of shear connectors are further installed in a certain section of the lower end of the steel column.

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 casing guide and the detachable auxiliary term of the present invention, even when the construction site is narrow and the excavation depth is deep, a plurality of auxiliary ports are combined to lower the PHC pile from the ground to the required depth. . In addition, it is possible to use the reverse drilling method to construct the slab along the height direction of the steel column after excavation. In addition, by using the casing guide, the PHC pile can be penetrated in place without collapsing and breaking the drilling hole. In addition, the separation and separation of the PHC pile for joints by the lifting safety pin is prevented when the auxiliary port is lifted, and construction safety is improved.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea 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 1e are flowcharts of a construction method of a PHC pile using a casing guide 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 cross-sectional view of the lower end of the removable auxiliary term applied to the present invention.
Fig. 3b is a bottom view of Fig. 3a;
Figure 4a is a perspective view showing one form of a removable auxiliary claim applied to the present invention.
Fig. 4b is a longitudinal sectional view of Fig. 4a;
Fig. 4c is a plan view of Fig. 4b;
Fig. 4D is a bottom view of Fig. 4B;
Figure 5a is a perspective view of the coupling between the removable auxiliary port shown in Figure 3a.
Figure 5b is a coupling state diagram sequentially showing the coupling operation between the removable auxiliary term shown in Figure 3a.
Figure 6 is a sequential coupling state diagram of the detachable auxiliary claim in a state in which the centering choke is installed at the lower end of the removable auxiliary claim applied to the present invention.
Figures 7a and 7b is a sequential coupling state of the removable auxiliary port in a state in which the lifting and centering plate is installed on the top of the PHC pile applied to the present invention.
8A and 8B are construction flowcharts schematically showing a three-dimensional view of a construction method of a PHC pile using a casing guide and a removable auxiliary term according to an embodiment of the present invention.
9A and 9B are cross-sectional and three-dimensional views illustrating another installation state of a steel column.
Figure 10a is a perspective view of another coupling part between the auxiliary claims applied to the present invention.
Figure 10b is an exploded view in which the split segments for the upper and lower coupling rings and joints in the auxiliary claim shown in Figure 10a are disassembled;
Figure 10c is a longitudinal cross-sectional view of the coupling portion between the auxiliary terms shown in Figure 10a.
Fig. 10D is a plan cross-sectional view taken along line KK of Fig. 10C.

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, as shown in FIG. 1A , the casing guide 20 is fixedly installed in the ground 10 , and a drilling hole 11 of a predetermined depth is constructed through the casing guide 20 .

As shown in FIG. 2, the casing guide 20 has a guide hole on the upper surface of the casing support steel plate 201 and the casing support steel plate 201 having a guide hole 201a equal to or larger than the outer diameter of the PHC pile 30. 201a), the guide casing 202 having the same size as the inner diameter, being erected concentrically, and provided with a plurality of lifting holes 202a, is installed on the lower surface of the casing support steel plate 201 in multiple pieces to support the casing guide 20. It is configured to include a fixed pile 203 for ground penetration fixed to the ground.

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 The position of (30) becomes accurate, and it is possible to prevent collapse and breakage of the entrance side of the perforation hole (11).

Connection and salvage of the PHC file (30) and the subclause (50)

Then, as shown in FIG. 1b , after connecting the PHC pile 30 and the auxiliary port 50 , the casing guide 20 is inserted and the PHC pile 30 is inserted into the drilling hole 11 by lifting it. The PHC file 30 and the auxiliary term 50 may be connected in a separate service hall (not shown).

As shown in FIGS. 3A and 3B , the auxiliary term 50 has an auxiliary term connection plate 52 at the lower portion and is connected to the upper end of the PHC pile 30 . 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 is a PHC pile 30 side high tension bolt 32 is inserted. It has a width w2 smaller than the width w1 of the expansion part 521a and the expansion part 521a and communicates with each other and includes a connection fixing part 521b to which the head part of the high tension bolt 30 is connected and fixed. A safety pin fastening screw hole 521c for fastening the safety prevention pin 54 in order to prevent loosening of the high tension bolt 30 is formed in the outer peripheral section of the auxiliary port connection plate 52 in which the top 521b is formed.

Therefore, when the safety prevention pin 54 is fastened to the safety pin fastening screw hole 521c, the separation of the auxiliary port 50 from the PHC pile 30 is prevented during the lifting, and a safe lifting is performed.

Here, when the penetration of the PHC pile 30 deepens, as shown in FIGS. 4 and 5 , a plurality of auxiliary terms 50 may be combined and installed. At this time, the combination of the adjacent auxiliary terms (50 and 50) is after the auxiliary term coupling key 503 is inserted into the auxiliary term key coupling groove 501, the auxiliary term coupling key 503 side bolt insertion hole 504 to the auxiliary term connection bolt 510 ) can be made by inserting a screw into the fastening screw hole 502 on the side of the auxiliary key coupling groove 501 side.

Therefore, as shown in FIGS. 4A and 4D , 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.

In addition, as shown in FIG. 6 , the auxiliary term 50 may further include a centering choke 56 having a conical guide 561 matching the central axis with the PHC pile 30 at the lower end thereof. In this case, the auxiliary term 50 is easily connected to the PHC pile 30 through the centering choke 56 so that the central axis coincides, so that the lifting operation is performed quickly.

In addition, as shown in FIGS. 7A and 7B , the PHC pile 30 is positioned to face each other at the top thereof, and has a lifting hole 341 and a pair of lifting double centering plates to align the concentric axis when combined with the auxiliary term 50 ( 34) may be further installed. At this time, the lifting hole 341 may be automatically unlocked after being hung on the double lifting centering plate 34 using a well-known lifting ring.

Insertion of light and steel pillars (60) of the auxiliary term (50)

Then, as shown in FIG. 1d, after hitting the auxiliary port 50 so that the PHC pile 30 penetrates the supporting ground, the steel column 60 is inserted into the PHC pile 30 through the auxiliary port 50 inside.

In this process, the lower end of the steel column 60 may be installed down to the inner floor of the PHC pile 30 as shown in FIGS. 8A and 8B . In addition, as shown in FIGS. 9A and 9B , the lower end of the steel column 60 may be installed to rise from the inner floor of the PHC pile 30 by a certain height. At this time, it is preferable that the steel column 60 is further installed with a shear connector 601 in the buried section.

Synthesis of steel column (60) and PHC pile (30)

Then, as shown in FIG. 1d , the filler 70 is injected into the PHC pile 30 to synthesize the steel column 60 in the PHC pile 30 . The filler 70 may be mortar or grout.

Dismantling and backfilling of auxiliary term (50)

Next, after curing of the filler 70 , the auxiliary term 50 is disassembled and drawn from the PHC pile 30 , and the hole backfilling is performed with earth and sand in the drilling hole 11 .

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 20 is completed on the construction site, excavation is performed until the excavation is reached, and the foundation 200 is constructed at the lower end of the PHC pile 20 as shown in FIG. 1e, and then the The slab 210 is sequentially constructed upwards.

According to this construction method, even when the construction site is narrow and the depth of excavation is deep, a plurality of auxiliary ports can be combined to lower the PHC pile 20 from the ground to the required depth. 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 such, since the divided segment 57 for the joint has an arc-shaped structure, it is possible to obtain an effect that is 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
50: auxiliary term
60: steel column

Claims (9)

(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) connecting the PHC pile 30 and the auxiliary port 50 and then lifting the casing guide 20 to insert the PHC pile 30 into the drilling hole 11;
(c) after hitting the auxiliary term (50), inserting the steel column (60) into the PHC file (30) through the inside of the auxiliary term (50);
(d) injecting the filler 70 into the PHC pile 30 to synthesize the steel column 60 into the PHC pile 30;
(e) dismantling and drawing the auxiliary term (50) from the PHC pile (30) after curing of the filler (70), and backfilling the hole with soil in the drilling hole (11);
In the step (a), the casing guide 20 is a guide on the upper surface of the casing support steel plate 201, the casing support steel plate 201 having a guide hole 201a equal to or larger than the outer diameter of the PHC pile 30 is formed. The guide casing 202, which has the same size as the inner diameter of the hole 201a, is erected concentrically, and has a plurality of lifting holes 202a, is installed on the lower surface of the casing support steel plate 201 in plurality, and the casing guide 20 ) including a fixed pile 203 for ground penetration for fixing 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 expansion part 521a and the expansion part 521a into which the high tension bolt 32 on the side of the PHC pile 30 is inserted and communicates with each other. To prevent loosening of the high tension bolt 30 in the outer peripheral section of the auxiliary port connection plate 52 in which the connection fixing part 521b is provided to which the head part of the high tension bolt 30 is connected and fixed, and the connection fixing part 521b is formed. A screw hole 521c for fastening the safety pin for fastening the safety prevention pin 54 is formed,
The auxiliary term 50 is a PHC pile using a casing guide and a removable auxiliary term, characterized in that a centering choke 56 having a conical guide 561 matching the central axis with the PHC pile 30 is further installed at the bottom thereof. construction method. delete The method of claim 1,
In the step (b), a plurality of sub-terms 50 are coupled and installed, and the combination of adjacent sub-terms (50 and 50) is performed after the sub-term coupling key 503 is inserted into the sub-term key coupling groove 501, A casing guide and detachable type, characterized in that by inserting the auxiliary term connection bolt 510 into the auxiliary term coupling key 503 side bolt insertion hole 504 and screwing it into the auxiliary term key coupling groove 501 side fastening screw hole 502 Construction method of PHC pile using auxiliary terms. delete delete The method of claim 1,
In the step (b), the PHC pile 30 is positioned to face each other at its upper end, and has a lifting hole 341 and a pair of lifting centering plates 34 to align the concentric axis when combined with the auxiliary port 50. ) Construction method of PHC pile using a casing guide and a removable auxiliary port, characterized in that it is further installed. The method of claim 1,
In step (c),
The construction method of the PHC pile using a casing guide and a removable auxiliary port, characterized in that the lower end of the steel column 60 is installed down to the inner floor of the PHC pile 30 . The method of claim 1,
In step (c),
The lower end of the steel column 60 is installed to rise by a certain height from the inner floor of the PHC pile 30, and a plurality of shear connectors 601 are further installed in a certain section of the lower end of the steel column 60. Construction method of PHC pile using casing guide and detachable auxiliary port. 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 clause 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 casing guide and a removable auxiliary term, characterized in that the plurality of or more are circularly arranged and are respectively fastened to the upper coupling ring (55A) and the lower coupling ring (55B) with bolts (59A, 59B).

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