KR101021302B1 - Pile for underground foundation working and construction method thereof - Google Patents

Abstract

PURPOSE: A pile for foundation work and a construction method thereof are provided to appropriately cope with the change of the construction length by securely connecting steel pile to the top of the concrete pile buried in the ground. CONSTITUTION: A pile for foundation work comprises a concrete pile(10), a steel pipe pile(20), and a pile binding member(30). The concrete pile comprises a reinforcement cap, a front shoe, a reinforcing bar, a spiral wire, and a reinforcing band. The steel pipe pile is combined on the top of the concrete pile. The steel pipe pile comprises a hollow part, a furrower, a diaphragm, and a guide rib. The pile binding member unites the concrete pile and the steel pipe pile. The pile binding member comprises a binding bar and a cutoff plate.

Description

Pile for underground foundation working and construction method

The present invention relates to a pile file for foundation work and a construction method thereof, and more particularly, a steel pipe pile is provided on the upper portion of a hollow concrete pile to enhance horizontal stress on the outside, and the composite pile is firmly connected to the upper structure. The present invention relates to a foundation pile and a method of construction thereof providing a stable foundation structure.

Generally, pile construction is to install the structure on the upper part of the ground.
In order to ensure sufficient bearing capacity in response to the load conditions of the structure.

Ground that is not secured is usually called soft ground, and the pile construction method is to be installed before the installation of the structure in order to transfer the load of the structure to the support layer evenly and safely.

Pile construction method is to hit the concrete pile or steel pipe pile made in the factory with a diesel hammer, hydraulic hammer, etc., or to drill and install the ground first.

On the other hand, the length of the pile is selectively used according to the depth of the ground. Concrete piles and steel pipe piles are made to have a maximum length of 15m due to the limitation of transportation.

However, some construction sites require pile lengths of several tens of meters in excess of 15m, depending on the ground conditions.

The stress applied to the pile by the structure can be divided into horizontal and vertical forces. The horizontal force is maximized within about 10m from the ground surface.

Therefore, even if the length of the pile is long because the depth of the foundation is deep, the lower part of the pile acts only a vertical force, so even a concrete pile with low strength that can withstand horizontal loads can exhibit sufficient strength, and the upper portion close to the ground surface. In many cases, the horizontal force is generated and the concrete pile cannot provide sufficient strength.

To this end, steel pile piles with high shear strength are used as upper piles installed on the surface of the surface where the lateral forces are largely applied, and concrete piles with relatively weak shear strength are simultaneously applied to the part with a deeper depth from the surface where the horizontal forces are less applied. It may also be formed in a configuration.

In the method of connecting two or more steel pipe piles and concrete piles in this way, a method of constructing a welded joint or a non-welded joint between piles has already been disclosed by Korean Patent Nos. 720946 and 798647.

However, the construction of connecting the upper steel pipe pile and the concrete pile pile has a problem that can not properly cope with the length of the pile in accordance with the change of the ground conditions.

In other words, if the length of the pile is longer than expected, the length of the upper steel pipe pile should be too long. On the contrary, if the pile length is shortened, structural problems may occur.The difference between the cross-sectional area of the steel pipe pile and the cross-sectional area of the concrete pile is large. Concentration of stress is generated at the portion where the pile and the concrete pile are coupled, which causes problems such as breakage or cracking in the concrete pile and deformation of the steel pipe pile.

In addition, in the process of joining the foundation of the pile and the pile head after the construction of the pile, it has been suggested to form a fastening hole in the concrete pile in order to connect the concrete pile and the steel pipe pile, but this is not only impossible to work on the actual site. There is a problem that it is impossible to form a fastening hole in the concrete pile itself.

In order to solve this problem, additional piles are installed around the piles, the heads of the piles are greatly expanded, or concrete is filled in the piles, but the reinforcing cost is a significant economic burden. In addition to the uneconomical problems, it is difficult to provide piles of various lengths according to the ground conditions, and the mutual coupling force between the concrete pile and the steel pipe pile is low, so that it is difficult to expect the efficiency of reinforcement.

Accordingly, the present invention is to improve the above problems, the present invention is to ensure that the steel pipe pile is connected to the upper portion of the concrete pile embedded in the ground, the upper end of the steel pipe pile to be firmly connected to the foundation of the structure of the construction length The main purpose is to provide a file for the foundation construction and its construction method that can respond appropriately to changes.

In another aspect, the present invention is to provide a file for the construction of the foundation and its construction method to improve the construction, economics and construction quality by using a variety of thickness of the steel pipe pile, and to enable reinforcement of the problem pile. .

In accordance with the above object of the present invention, the construction pile, the upper end of the body having a vertically hollow hollow ring-shaped reinforcement cap is coupled, the lower end is coupled to the tip shoe, the body is a plurality of reinforcement vertically The excavation, the outer side of the reinforcing reinforcement is a spiral wire is excreted, the upper end or the lower end of the body or the upper end and the lower end of the ring-shaped connection plate that can be welded or welded at the same time is provided so that at least one concrete connected A file; It is coupled downward from the top of the concrete pile to have a predetermined width larger than the outer diameter of the concrete pile, and at the bottom portion to form an inverted triangular shape of the top plate so as to minimize the resistance to soil, and along the inner circumferential surface of the top plate Is provided with a ring-shaped diaphragm to cope with the change in surface curvature of the outer circumferential surface of the concrete pile while preventing the intrusion of soil between the outer circumferential surface of the concrete pile, the upper and middle inner surfaces of the height of the concrete pile along the main surface respectively A steel pipe pile configured to radially form a plurality of guide ribs so as to maintain a constant distance from an outer circumferential surface thereof; A plurality of binding bars, one end of which is screw-connected to an upper end of the outer circumferential surface of the steel pipe pile, is provided in the upper portion of the combination of the concrete pile and the steel pipe pile, and placed in the hollow upper portion of the concrete pile It is configured as a pile binding member for binding between the concrete pile and the steel pipe pile provided with a blocking plate for screwing the other end of the binding bar while preventing the concrete from flowing into the lower portion.

In the above configuration, the concrete pile has a lower end portion provided with a tip shoe, and an upper portion provided with a ring-shaped connecting plate capable of welding or welding without welding, and an upper portion and a lower portion having a ring shape with welding or non-welding joints. It is provided as a connecting plate provided with at least one central pile provided in accordance with the construction height, and a ring-shaped connecting plate that can be welded or welded at the lower end only, the upper portion is configured as an upper pile to be provided with a reinforcing cap Formation is also possible.

Further, in the above configuration, the binding bar of the pile binding member allows the portion located above the combination of the concrete pile and the steel pipe pile to be separable, and the socket is screwed between the separated both ends to manipulate the socket. By the length adjustment is possible.

On the other hand, the construction method of the foundation construction pile of the present invention comprises the steps of preparing a concrete pile suitable for the length to be constructed; Using the concrete pile to drive the ground to a certain depth on the ground; Driving the steel pipe pile formed to have a larger inner diameter from the upper end of the concrete pile such that the upper end thereof matches the upper end of the concrete pile; One end of the outer side from the top of the combination of the concrete pile and the steel pipe pile is screwed from the outer circumferential surface and the outside of the steel pipe pile, and the other end is connected to the pile binding member for screwing to the blocking plate located in the hollow of the concrete pile Steps; Filling cement milk between the concrete pile and the steel pipe pile to harden; The concrete is poured over the upper part of the pile assembly protruding to the upper part of the ground and the upper part of the blocking plate which is provided in the hollow of the concrete pile, and then cured so that a firm coupling between the concrete pile and the steel pipe pile is achieved. will be.

In the above concrete pile is composed of a short length lower pile, one or more middle pile and the upper pile so that the lower pile, the central pile and the upper pile at the construction position of the ground is sequentially buried by the driving.

In the above, the lower pile and the central pile, the central pile and the central pile or the central pile and the upper pile are connected by welding between the ring-shaped connecting plate of each end during the driving process.

In the above, the lower pile and the central pile, the central pile and the central pile or the central pile and the upper pile are connected by bolting between the ring-shaped connecting plate of each end.

The present invention according to the above-described configuration and method is according to the condition of the ground to be constructed in the field of concrete piles consisting of a single ready-made concrete pile or a lower pile and a plurality of pile piles and a plurality of pile piles Allows for construction in suitable and varying lengths.

In addition, the present invention is to be a sufficient reinforcement for the stress in the horizontal direction while the reinforcement is made by the cement milk is filled between the concrete pile and the steel pipe pile without making a thick thickness of the steel pipe pile coupled to the concrete pile.

In particular, it is easy to bury the steel pipe pile, and to provide a stable and solid foundation pile construction by increasing the binding force with the concrete pile.

1 is a vertical cross-sectional view showing an embodiment configuration of the foundation construction file according to the present invention,
2 is an exploded cross-sectional view separating the configuration of FIG.
Figure 3 is an enlarged cross-sectional view showing the configuration of the lower end of the steel pipe pile according to the present invention,
Figure 4 is a cross-sectional view applying another embodiment of the concrete pile applied to the present invention,
5 is an exploded cross-sectional view illustrating the concrete pile of FIG. 4;
Figure 6 is an enlarged cross-sectional view of the main portion illustrating the connection between the bolts between the concrete piles according to another embodiment of the present invention,
7 is a structural diagram showing another embodiment in which the binding bar of the pile binding member according to the present invention is adjustable;
8 is a process flow diagram illustrating a construction process of the drive type according to the present invention,
Figure 9 is a cross-sectional view showing a state of pile construction for foundation work constructed in accordance with the present invention.

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

1 is a vertical cross-sectional view illustrating an embodiment configuration of the foundation construction pile according to the present invention in a separated state, Figure 2 is a combined cross-sectional view of FIG.

The present invention is largely composed of a combination of the concrete pile 10 and the steel pipe pile (20).

As shown in the embodiment of the present invention, the concrete pile 10 is to be molded in accordance with the construction length of the ground.

The concrete pile 10 has a hollow 12 along the center of the body 11, the upper end portion is a ring-shaped reinforcement cap 13 is coupled, the lower end portion 14 is configured to be coupled to the tip shoe (14).

That is, the reinforcing cap 13 is a configuration for protecting the upper end of the concrete pile 10 during the driving, the shape is formed in the ring shape in the same as the horizontal cross section of the body 11 at the upper end of the body 11, the tip shoe ( 14 is configured to close the hollow 12 in order to prevent the inflow of soil into the hollow 12 from the lower end of the body 10 or to open the pile end to open the fixing hole at the tip of the construction hole Can be formed.

However, it is more preferable that the closed tip shoe 14 is formed so that the portion covering the hollow 12 is curved upward.

The plurality of reinforcing bars 15 are vertically disposed in the concrete body 11, and the spiral iron wires 16 are disposed outside the reinforcing bars 15.

The reinforcing bars 15 are reinforcing bars vertically disposed on concentric circles along the ring-shaped body 11, and the reinforcing bars 15 are usually buried in three or more.

At this time, the reinforcing reinforcing bar 15 is secured to be secured to the upper end and the lower end side reinforcement cap 13 and the tip shoe 14 of the body 11 while being formed as a larger size.

Spiral iron wire 16 is configured to be wound around the outer side of the reinforcing bar 15 in a spiral shape so that the reinforcing bar 15 can be stably maintained at the time of concrete molding.

Therefore, the reinforcing bar 15 and the spiral wire 16 are formed as reinforced concrete while allowing both ends to be fixed between the reinforcing cap 13 at the upper end and the tip shoe 14 at the lower end before placing the concrete when forming the body 11. It is a configuration to be molded.

On the other hand, the concrete pile 10 of the present invention is preferably provided with a reinforcing band 17 to a predetermined height on the outer peripheral surface of the upper end and the lower end.

In particular, the upper end of the reinforcing cap 13 may be formed of only a cylindrical reinforcing band 17 without a ring-shaped end plate.

The concrete pile 10 is to be coupled to the steel pipe pile 20 from the top.

The steel pipe pile 20 forms a vertically penetrated hollow 21 with a diameter to accommodate the concrete pile 10, and from the upper end of the concrete pile 10 to cover a certain height of the concrete pile 10. It is a configuration that is combined downward on the outer circumference.

The lower end of the steel pipe pile 20 is to be coupled to the top plate 22 having an inverted triangle cross-sectional shape so as to minimize the resistance with the soil.

In other words, the top plate 22 so that the sharp edge portion of the tip is located at the lower end so that the steel pipe pile 20 can be more easily buried while minimizing the resistance of the soil when inserted into the ground.

The inner circumferential surface of the top plate steel pipe pile 20 of the top plate 22 is provided with a ring-shaped diaphragm 23 to prevent the intrusion of soil between the outer circumferential surface of the concrete pile 10.

That is, as the steel pipe pile 20 is embedded into the ground, soil on the ground side may flow through the space spaced between the concrete pile 10 and the concrete pile 10, and the soil flows through the top plate 22. It is preferable to be blocked by the diaphragm 23 at the top of the top plate 22.

The diaphragm 23 has a ring-shaped accommodation ring 230 having a U-shaped cross section to be opened inward as shown in FIG. 3, and the outer circumferential surface flexion change of the concrete pile 10 while being inserted into the accommodation ring 230. It can be made as a finishing material 231 to properly respond to.

At this time, the finish material 231 in contact with the surface of the outer peripheral surface of the concrete pile 10 is most preferably made of a material such as urethane, synthetic resin or synthetic rubber.

In addition, the hollow 21 of the steel pipe pile 20 is provided with a plurality of guide ribs 24 along the main surface to support the upper and middle inner circumferential surface to maintain a constant distance from the outer circumferential surface of the concrete pile 10.

Therefore, it is most preferable that the finishing material 231 of the guide rib 24 and the diaphragm 23 from the upper portion of the hollow 21 in the steel pipe pile 20 is formed so as to have an inner diameter close to the outer circumferential surface of the concrete pile 10.

Unlike the configuration of the embodiment described above, the concrete pile 10 of the present invention may be provided in a plurality of configurations.

4 is a cross-sectional view to which another embodiment of the concrete pile applied to the present invention is applied, and FIG. 5 is a separated cross-sectional view illustrating the concrete pile of FIG. 4.

As shown in the drawing, the other embodiment of the present invention is made of the concrete pile 10 and the steel pipe pile 20.

However, in another embodiment of the present invention, the concrete pile 10 is divided into a lower pile 10a, a middle pile 10b, and an upper pile 10c, and thus a middle pile between the lower pile 10a and the upper pile 10c ( According to the number of 10b), it is possible to fit the required construction length.

That is, the concrete pile 10 in the present embodiment is divided into a lower pile 10a, a middle pile 10b, and an upper pile 10c.

First of all, the lower pile (10a) is to be provided with a tip shoe 14 in the lower end, and the upper end is to be provided with a ring-shaped connecting plate 18 is weldable.

And the central pile (10b) is connected to the ring-shaped connecting plate 18, which can be welded to the upper end and the lower end, but the upper pile (10c) ring-shaped connecting plate 18 is weldable to the lower end only To be provided, the upper end to be provided with a reinforcing cap (13).

Therefore, the concrete pile 10 in the present embodiment can be formed to the required construction length by welding as many as the number of the central pile 10b between the lower pile 10a and the upper pile 10c. do.

The connection portion of the concrete pile 10 formed by the combination of the lower pile 10a, the middle pile 10b, and the upper pile 10c may be connected by bolting fastening as shown in FIG. .

Meanwhile, the steel pipe pile 20 connected to the concrete pile 10 is configured to surround the outer upper portion of the concrete pile 10 and is the same as the configuration in the above-described embodiment.

That is, the lower end is provided with a top plate 22 to minimize the resistance of the soil when inserted into the ground, so that the sharp edge of the tip is located at the bottom, and the top of the top plate 22 has a ring-shaped diaphragm ( 23) is formed, and the upper and middle lengths of the hollow 21 to be formed as a plurality of guide ribs 24 along the main surface to maintain a constant distance from the outer peripheral surface of the concrete pile (10).

Meanwhile, in the configuration of the present invention, the pile binding member 30 is provided at the upper end of the coupling structure combining the concrete pile 10 and the steel pipe pile 20.

Pile binding member 30 is composed of a plurality of binding bars 31 and the plate blocking plate 32, the double binding bar 31 is a P-shaped shape of the hollow 11 of the concrete pile 10 And the outer circumferential surface of the steel pipe pile 20.

At this time, the blocking plate 32 of the plate is provided with an outer diameter close to the inner diameter of the hollow 11 at a predetermined height from the upper end of the hollow 11 of the concrete pile 10, one end of the binding bar 31 is the blocking plate 32 The other end of the binding bar 31 is screwed to the upper end of the outer circumferential surface of the steel pipe pile 20 in the upper portion of the combination of the concrete pile 10 and the steel pipe pile 20.

On the other hand, the pile binding member 30 of the present invention as shown in Figure 7 so that the portion located on the upper portion of the combination of the concrete pile 10 and the steel pipe pile 20 of the binding bar 31 is provided with a detachable configuration The length to the radial side can be finely adjusted by screwing the part which was made by the socket 33. FIG.

Referring to the method for constructing the foundation file of the present invention according to the above configuration on the ground in more detail as follows.

When looking at the construction method of the basic construction file here, the construction method is largely divided into two types, which can be seen as a driving method and a landfill method. The rudder method refers to the construction method by hitting the head of the pile with a heavy hammer during the construction of the pile, and the embedding method refers to the method of first inserting the pile into the drilled hole after constructing the hole at the position where the pile will be constructed.

8 is a construction flowchart of the driving method according to the present invention.

First, prepare a concrete pile 10 suitable for the length to be constructed.

The concrete pile 10 uses ready-made products already manufactured at the factory as the length to be constructed.

However, the concrete pile 10 may be provided in one configuration to the maximum length that can be transported as a construction unit, but the lower pile (10a) and the plurality of central pile (10b) and the upper pile (10c) of shorter length ), A configuration in which a plurality of files are connected may be provided in one construction unit.

Concrete piles made of these short length piles are connected by non-welding such as welding or bolting on site, respectively, so that construction can be performed.

On the other hand, the method of embedding the concrete pile 10 in the ground can be made into a normal driving method and a buried type.

The crushing method is constructed by hitting the upper end of a single concrete pile 10 by using heavy equipment such as a hammer, or the concrete pile 10 composed of a plurality of piles is one or more central piles ( 10b) and the upper pile (10c) to be embedded by hitting while sequentially welding or bolting.

In particular, the concrete pile (10) consisting of a plurality of piles are buried in the ground from the lower pile (10a) while the central pile (10b) to the upper end of the lower pile (10a) partially protruded from the ground by welding or bolting The central pile 10b or the upper pile 10c is sequentially connected to the upper portion which is integrally connected and hits the upper portion of the central pile 10b that is connected again, and is partially exposed to the upper part of the ground of the central pile 10b. Welded or bolted to be buried sequentially by driving.

On the other hand, in addition to the burying of concrete pile piles, reclamation should be preceded by digging construction holes with a certain depth and diameter using heavy equipment such as excavators (screw augers) in the ground where concrete piles 10 will be buried. .

The concrete pile 10 is to be buried in such a way that it is lifted by a crane to be inserted into the construction hole.

When the insertion of the concrete pile 10 is completed, the steel pipe pile 20 is inserted from the upper portion while wrapping the outer side of the concrete pile 10.

Since the steel pipe pile 20 has an inner diameter larger than the outer diameter of the concrete pile 10, and the bottom plate 22 is provided in the shape of an inverted triangle so that the sharp portion of the tip is located at the bottom thereof, the steel pipe pile 20 is provided from the upper portion of the concrete pile 10. It can be buried safely with minimal resistance to soil soil.

Since the steel pipe pile 20 is usually formed within 10 meters, it is most preferable to be buried to a depth of 10 meters, but the upper end is positioned at the same height as the upper end of the concrete pile 10.

The steel pipe pile 20 is a concrete pile while the concrete pile 10 is buried in any way, whether driven or buried, the steel pipe pile 20 is spaced at regular intervals by the concrete pile 10 and the guide ribs 24 Since it is coupled in a shape surrounding the outside of the 10, the upper portion of the concrete pile 10 to be stably supported against the impact from the outside by a certain height.

When the steel pipe pile 20 is buried by guide ribs 24 formed between the concrete pile 10 and the steel pipe pile 20 in the upper and middle portions of the hollow 21 of the steel pipe pile 20. A space of a certain width is formed.

When the filling of the concrete pile 10 and the steel pipe pile 20 is completed, the pile binding member 30 provided in the upper portion of the hollow 12 of the concrete pile 10 in the concrete pile 10 and the steel pipe pile 20 in the upper part of the ground. By the concrete pile 10 and the steel pipe pile 20 to be connected.

That is, Figure 9 is a cross-sectional view showing a pile construction state according to the present invention, the outer end of the binding bars 31 provided with a plurality of pile binding members 30 are fastened to the outer peripheral surface of the upper end of the steel pipe pile 20, respectively The inner ends, which are screwed through the holes, and which are positioned in the hollow 12 of the concrete pile 10 of the binding bars 31, are each screwed into the blocking plate 32 which is located on the upper side in the hollow 12. To be combined.

In this case, the binding bars 31 are positioned between the concrete pile 10 and the steel pipe piles 20 so that the length thereof can be adjusted by the socket 33 and the concrete pile 10 and the steel pipe pile 20 can be adjusted. Make sure to respond accordingly.

When the pile binding member 30 is connected in this way, the cement milk 40 is filled between the concrete pile 10 and the steel pipe pile 20, that is, between the outer circumferential surface of the concrete pile 10 and the inner circumferential surface of the steel pipe pile 20. Be sure to

The cement milk 40 thus filled is no longer flowed downward by the diaphragm 23 provided at the lower end of the steel pipe pile 20. The steel pipe pile 20 is firmly connected.

In addition, the cement milk 40 thus filled has a function of reinforcement so that the concrete pile 10 can be more safely maintained against the impact that is exerted from the outside of the steel pipe pile 20.

Therefore, it is possible to maintain a strong support force in the ground (60), so that the reinforcement is made even more than the composite pile is combined with the steel pipe pile to the upper end of the concrete pile to be recently proposed.

On the other hand, including the upper end of the pile formed to project a certain height upward from the ground 60 in the state in which the pile binding member 30 is connected to the hollow 12, the block plate 32 of the concrete pile 10 is provided When the concrete 50 is placed in a predetermined area, the concrete pile 10 and the steel pipe pile 20 are more firmly bound to maintain stable supporting force.

As described above, according to the present invention, since the depth and length can be freely adjusted according to the state of the ground 60, construction management is convenient.

In addition, since the thickness of the steel pipe pile 20 needs to be changed in consideration of the stress applied to the pile, economical design and construction are possible.

In particular, the present invention is capable of stable reinforcement in response to various construction defects that may occur during construction.

10: concrete file
11: body
12: hollow
13: reinforcement cap
14: Tip shoe
15: rebar
16: spiral wire
17: reinforcement band
18: connecting plate
20: steel pipe file
21: hollow
22: topboard
23: barrier
230: receiving ring
231: finish
24: guide rib
30: file binding member
31: Binding Bar
32: blocking plate
40: cement milk
50: pour concrete
60: ground

Claims (7)

A ring-shaped reinforcement cap 13 is coupled to an upper end of the body 11 having a vertically penetrating hollow 12, a tip shoe 14 is coupled to a lower end thereof, and a plurality of vertically to the body 11. Reinforcing bar 15 is excreted, spiral reinforcing wire 16 is disposed outside the reinforcing bar 15, the upper end or the lower end of the body 11 or the upper end and the bottom can be welded or welded at the same time A concrete pile 10 connected to one or more so that the ring-shaped connecting plate 18 is provided;
It has a hollow 21 having a predetermined width larger than the outer diameter of the concrete pile 10, is coupled downward from the upper portion of the concrete pile 10, the bottom portion of the top plate (inverted triangular shape) so as to minimize the resistance with the soil ( 22) and the surface circumference of the outer circumferential surface of the concrete pile 10 can be responded to while preventing the intrusion of soil between the outer circumferential surface of the concrete pile 10 along the inner circumferential surface of the top plate 110. A ring-shaped diaphragm 23 is provided, and a plurality of guide ribs 24 are formed radially to maintain a constant distance from the outer circumferential surface of the concrete pile 10 along the upper surface and the inner circumferential surface of the middle height, respectively. A steel pipe pile 20;
The concrete pile 10 and the plurality of binding bars 31 are provided in the shape of the P-shaped in the upper portion of the combination of the steel pipe pile 20, the one end is screwed to the upper end of the outer peripheral surface of the steel pipe pile 20, and the concrete The concrete is provided with a blocking plate 32 provided at an upper portion of the hollow 12 of the pile 10 so that the other end of the binding bar 31 is screwed while preventing the pouring concrete to be poured into the lower portion thereof. Pile binding member 30 for binding between the pile (10) and the steel pipe pile (20);
Foundation construction file. The lower pile (10a) of claim 1, wherein the concrete pile (10) is provided with a tip shoe (14) at the lower end, and the upper pile is provided with a ring-shaped connecting plate (18) capable of welding or welding without welding. The upper end and the lower end are provided with a ring-shaped connecting plate 18 which can be welded or welded to each other so that at least one of the central pile 10b is provided according to the construction height, and only the lower end is welded or welded to the ring. Foundation connection pile provided with a connecting plate 18 of the shape, the upper end portion 10c to be provided with a reinforcing cap (13). The method of claim 1, wherein the binding bar 31 of the pile binding member 30 is a portion located above the combination of the concrete pile 10 and the steel pipe pile 20 to be separated, separated between both ends As the socket 33 is screwed to the foundation construction pile so that the length can be adjusted by the operation of the socket (33). Preparing a concrete pile 10 suitable for the length of construction;
Using the concrete pile (10) to drive the ground to a predetermined depth on the ground;
Driving the steel pipe pile 20 formed to have a larger inner diameter from the upper portion of the concrete pile 10 so that the upper portion thereof matches the upper portion of the concrete pile 10;
One end of the outer side from the upper portion of the combination of the concrete pile 10 and the steel pipe pile 20 is screwed from the outer peripheral surface and the outside of the steel pipe pile 20, the other end in the hollow 12 of the concrete pile 10 Connecting a plurality of binding bars 31 to be screwed to the blocking plate 32 located;
Filling cement milk (40) between the concrete pile (10) and the steel pipe pile (20) to harden;
Curing after the concrete 50 is poured over the upper part of the pile assembly protruding into the upper part of the ground 60 and the upper part of the blocking plate 32 provided in the hollow 12 of the concrete pile 10. To make a firm coupling between the concrete pile (10) and the steel pipe pile (20);
Pile construction method for foundation construction that pile construction is carried out by. The method according to claim 4, wherein the concrete pile 10 is composed of a lower length pile (10a), at least one of the central pile (10b) and the upper pile (10c) of the lower pile (10a) and the construction position of the ground (60) A pile construction method for foundation work, in which a central pile (10b) and an upper pile (10c) are buried sequentially by driving. The method of claim 5, wherein the lower pile (10a) and the central pile (10b), the central pile (10b) and the central pile (10b) or the central pile (10b) and the upper pile (10c) is ring-shaped connection of each end in the driving process Pile construction method for foundation work to be connected by welding between plates (18). The method of claim 5, wherein the lower pile (10a) and the central pile (10b), the central pile (10b) and the central pile (10b) or the central pile (10b) and the upper pile (10c) is ring-shaped connection of each end in the driving process Pile construction method for foundation work to be connected by bolting between plates (18).

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