KR20080013236A - Bored precast pile for foundation and mold forming bored precast pile - Google Patents

Abstract

An embedded pile for the foundation of a building is provided to heighten adhesive strength by forming a stepped hanging projection on the outer circumferential surface of a main pile body, thereby preventing the relative movement of an embedded pile and grout. An embedded pile for the foundation of a building comprises a main pile body(10) embedded in a perforated hole formed downward in the ground where a building structure is to be constructed, provided with a hollow(11) and fixed with plural reinforcing bars(12) between the inner circumferential surface and the outer circumferential surface of the main pile body, and a hanging projection(20) formed to be stepped and projected from the outer circumferential surface of the main pile body and placed around the main pile body in the type of a ring to increase the adhesive strength of the main pile body and grout placed in the perforated hole.

Description

Bored precast pile for foundation and mold forming bored precast pile}

1 is a schematic configuration diagram of a conventional SIP method.

Figure 2 is a schematic perspective view of the embedded pile for civil and building foundations according to the first embodiment of the present invention.

3 is a schematic cross-sectional view showing a state of use of the embedded pile for civil and building foundation shown in FIG.

4 is a schematic cross-sectional view taken along the line IV-IV of FIG. 3.

5 is a schematic cross-sectional view showing a state of use of the embedded pile for civil and building foundations according to a second embodiment of the present invention.

Figure 6 is a schematic perspective view of the embedded pile for civil and building foundations according to a third embodiment of the present invention.

Figure 7 is a schematic perspective view of the embedded pile for civil and building foundations according to a fourth embodiment of the present invention.

8 is a schematic perspective view of the formwork for manufacturing the pile pile according to a preferred embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view taken along line VII-VII of FIG. 8.

<Explanation of symbols for the main parts of the drawings>

100 ... Piles pile for civil and building foundations 10 ... Pile bodies

11 ... hollow 12 ... rebar

20,40 ... Jams 30 ... Jams

31,32,33 ... hanging bar 50,60 ... hanging groove

200 ... formwork for manufacturing pile 210 ... formwork body

211 ... Charging part 220 ... Hanging jaw forming part

c ... grout material h ... drilled hole

r ... concrete

The present invention relates to a buried pile for civil engineering and building foundation for strengthening the ground on which structures such as a building are to be built, and a formwork for manufacturing a buried pile for manufacturing the buried pile.

In order to build a structure such as a building, first, a foundation work must be performed on the ground. Various construction methods are used for this foundation work, but since the 1990s, civil cases such as ground vibration and noise caused by pile foundation driving have surged, and after excavating the ground, cement milk is produced through the auger head. Was injected to the ground, the slime was measured, a ready-made pile was purchased, and a method of curing the cement milk was applied. These methods have the advantage that they can be installed with low noise and low vibration, so they are frequently applied in civil engineering and building foundation works. In particular, the application of the SIP (soil cement injected precast pile) method has been popularized. The SIP method is shown in FIG. Referring to Figure 1, the SIP method is a cement with a continuous wing or auger (auger) attached to the wing (auger) having a diameter of about 100mm larger than the pile diameter (a, b) and then cement milk in the excavation hole ( Cement milk) is injected (c), and the pile is inserted (d) by pressure and slugging (drop, if necessary) and the final pile tip treatment (e) method of constructing the pile.

However, in the SIP method, there is a problem of weakening the required bearing capacity of the pile so that the adhesion strength between the embedded pile and cement milk is weak. Cement milk is filled and cured between the outer circumference of the embedded pile and the wall surface of the perforated hole and inside the hollow embedded pile. There is a problem that the bearing capacity of the pile is weakened by moving relative to the milk.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a buried pile for civil and building foundations whose structure is improved not only to increase adhesion between cement milk and buried pile but also to be manufactured very economically.

In addition, another object of the present invention is to provide a formwork for manufacturing piles for manufacturing the embedded piles with increased adhesion.

The embedding pile for civil and building foundations according to the present invention for achieving the above object, the pile body is formed in one direction as being embedded with a grout in a drilling hole formed by drilling the ground downward; And a locking portion formed stepwise with respect to an outer circumferential surface of the pile body and disposed along a circumference of the pile body in a direction intersecting with respect to a longitudinal direction of the pile body.

According to the present invention, the locking portion is a locking projection protruding with respect to the outer circumferential surface of the pile body or a recess groove inserted concavely with respect to the outer circumferential surface, and the locking portion is preferably disposed in a ring shape or a spiral shape along the circumference of the pile body. .

In addition, according to the present invention, the pile body is hollow and provided with a hollow portion therein, a plurality of which is disposed on a plane intersecting with respect to the longitudinal direction of the pile body, both ends of which are fixed to both sides of the inner peripheral surface of the pile body, respectively. It is preferable to further include a catching net in which the catching bars are arranged to cross each other.

Forming pile manufacturing dies according to the present invention for achieving the above another object is to manufacture the embedded pile to be embedded with the grout in the drilling hole formed by drilling the ground in the downward direction, long in one direction A hollow formwork body having a filling part formed therein to be formed to fill the material of the embedding pile; And a step forming portion formed stepwise with respect to the inner circumferential surface of the formwork body and disposed along a circumference of the formwork body in a direction intersecting with the longitudinal direction of the formwork body.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail with respect to the pile for civil engineering and building foundation and formwork for manufacturing pile according to the preferred embodiment of the present invention.

Figure 2 is a schematic perspective view of the embedded pile for civil and building foundation according to the first embodiment of the present invention, Figure 3 is a schematic cross-sectional view showing a state of use of the embedded pile for civil and building foundation shown in Figure 2, Figure 4 Is a schematic sectional view taken along the line IV-IV of FIG.

2 to 4, the embedding pile 100 for civil and building foundations according to the first embodiment of the present invention has a pile body 10 and the engaging portion.

The pile body 10 is embedded in the drilling hole (h) excavated downward in the ground (g) to be built structures, such as buildings, is formed long in one direction. In the first embodiment, the pile body 10 is hollow and has a hollow portion 11 provided therein. For example, a PHC pile (prestressed high strength concrete pile) may be used. In addition, a reinforcing bar 12 is inserted between the inner circumferential surface and the outer circumferential surface of the pile body 10. This reinforcing bar 12 is made of a rebar or PC (PC) steel wire material. This reinforcing bar 12 is formed long along the longitudinal direction of the pile body (10). A plurality of reinforcing bars 12 are disposed spaced apart from each other by a predetermined angular interval along the circumferential direction of the pile body 10. In the present embodiment, eight reinforcing bars are illustrated for convenience of description but 11 are generally disposed.

The locking portion is for increasing the attachment force between the pile body 10 and the grout material (c, grout) embedded together in the drilling hole (h). The locking portion is stepped with respect to the outer circumferential surface of the pile body 10, which means that the locking portion is formed in a direction crossing with respect to the longitudinal direction of the pile body (10). The locking portion may be in various forms according to the embodiment, and in the first embodiment, the locking portion is provided in the form of the locking jaw 20. The locking jaw 20 is formed to protrude with respect to the outer circumferential surface of the pile body 10 in a direction intersecting with the longitudinal direction of the pile body 10. The catching jaw 20 is disposed in a ring shape along the circumference of the pile body 10. The latching jaw 20 may be coupled to the pile body 10 separately, but is preferably formed integrally with the pile body 10 as in the present embodiment. On the other hand, the ring-shaped locking jaw 20 is spaced apart from each other along the longitudinal direction of the pile body 10 is disposed. In the present exemplary embodiment, the locking jaw 20 has been described and illustrated as being disposed along the longitudinal direction of the pile body 10, but this may vary in various ways depending on the length of the pile body 10. However, the locking jaw 20 is preferably disposed at the lower end than the upper end of the pile body (10). This is because the lower end of the pile body 10 is where the load is concentrated, so that the supporting force is increased when the grout material c and the pile body 10 have high adhesion strength. On the other hand, the protruding length of the locking jaw 20 is formed to about 5% of the diameter of the pile body (10). For example, in the case of the pile body 10 having a 400 mm diameter, the protruding length of the locking jaw 20 is about 15 mm to 25 mm. Drilling holes (h) to excavate to purchase the 400mm diameter pile most widely used in civil engineering and building foundations to form a diameter of about 500mm, so when the protruding length of the locking jaw 20 is too large This is because problems can arise. In addition, if the protruding length of the locking jaw 20 is formed too small, the effect of increasing the adhesion strength with the grout material c is not large.

On the other hand, the hook portion 30 is provided in the hollow portion 11 of the pile body (10). The catching network 30 is for increasing the attachment strength between the grout material c filled in the hollow portion 11 of the pile body 10 and the inner circumferential surface of the pile body 10. The catching net 30 is formed by a plurality of catching bars 31, 32, and 33 arranged in a cross direction. These engaging bars 31, 32, 33 are arranged on a plane intersecting with respect to the longitudinal direction of the pile body 10, respectively. In the present embodiment, the three catching bars 31, 32, and 33 are disposed on parallel planes, respectively, and are disposed to be vertically adjacent to each other along the longitudinal direction of the pile body 10. That is, as shown in FIGS. 3 and 4, a locking bar indicated by reference numeral 31 is disposed below the catching network 30, and a locking bar indicated by reference numeral 32 crosses each other on the locking bar of reference numeral 31 in the center. Stacked in the direction to be adjacent to each other, and the upper side is the engaging bar indicated by the reference number 33 is laminated on the reference bar 32, but is disposed in the direction intersecting with the other engaging bars (31, 32). Both ends of the catching bars 31, 32, and 33 are respectively fixed to both sides of the inner circumferential surface of the pile body 10. More specifically, the reinforcing bars 12 and the PC steel wire are fixed by a ring connection or soldering method. do. In this embodiment, the engaging bars 31, 32, 33 are made of a reinforcing material or so-called PC steel wire material. On the other hand, as described above, the catching network 30 consisting of a plurality of catching bars 31, 32, 33 are arranged in a plurality of spaced apart from each other along the longitudinal direction of the pile body 10, the lower end of the pile body 10 It is preferably arranged in. In addition, in this embodiment, the arrangement position of the catching net 30 is shown to be the same as the arrangement position of the catching jaw 20, but is not necessarily limited thereto, and is arranged in various ways, such as between the catching jaws 20. Can be set.

If the embedded pile 100 for civil and building foundations having the above configuration is embedded in the drilled hole (h) in which the grout material (c) is injected, the grout material (c) is the hollow portion 11 of the pile body (10) And is filled between the embedded pile 100 and the wall surface of the drilling hole (h). As shown in Figure 3, the grout material (c) is wrapped around the locking jaw (20) and the catching net (30) to prevent the relative movement between the embedded pile 100 and the grout material (c) and consequently embedded pile The effect of increasing the adhesive strength between and the grout material occurs. Grout material (c) may be used in various forms such as mortar, cement milk, concrete.

Hereinafter, the second to fourth embodiments of the present invention will be described. In the second to fourth embodiments, only the shape of the locking portion is different from that of the first embodiment, and other configurations such as the pile body 10 and the locking net 30 are all the same, and only the shape of the locking portion is detailed. Explain it.

In the second embodiment of the present invention, the locking portion is formed in the shape of the locking groove 40. 5 is a schematic cross-sectional view showing a state of use of the embedded pile for civil and building foundations according to a second embodiment of the present invention. Referring to FIG. 5, the locking groove 40 is formed in a concave shape with respect to the outer circumferential surface of the pile body 10. In addition, the locking groove 40 is arranged in an annular shape along the circumferential direction of the pile body 10, like the locking jaw 20 of the first embodiment, a plurality of spaced apart from each other along the longitudinal direction of the pile body 10 Dogs are placed. The insertion depth of the locking groove 40 is set to approximately 10mm to 20mm. If the insertion depth is too deep, the strength of the pile body 10 may be lowered, and if too low, the effect of increasing the adhesion strength is reduced.

In the first and second embodiments of the present invention, the locking portions are arranged in an annular shape, but in the third and fourth embodiments of the present invention, the locking portions are arranged in a spiral shape. 6 is a schematic perspective view of the embedded pile for civil and building foundations according to the third embodiment of the present invention, Figure 7 is a schematic perspective view of the embedded pile for civil and building foundations according to the fourth embodiment of the present invention.

6 and 7, in the third and fourth embodiments, the locking portion is disposed helically along the circumference of the pile body 10. In the third embodiment, the spiral locking portion is formed as the locking step 50 as in the first embodiment, whereas in the fourth embodiment, the locking groove 60 is formed as in the second embodiment. The protruding length of the locking step 50 of the third embodiment and the insertion depth of the locking groove 60 of the fourth embodiment are the same as those of the first and second embodiments, respectively.

In the second to fourth embodiments, as in the first embodiment, the grout material is hardened in a state in which the grating material and the locking part are wrapped, thereby preventing relative movement between the embedded pile 100 and the grout material, and consequently, the embedded pile and the grout. The effect of increasing the adhesion strength between the ashes occurs.

So far, the pile body 10 has been described and illustrated as being hollow, but it is not necessarily limited thereto, and a non-hollow ready-made concrete pile may be used.

The locking jaw 20, the locking groove 30, and the like have been described and illustrated as being continuously arranged in an annular or spiral shape along the outer circumferential surface of the pile body 10, but is not necessarily limited thereto. It may be intermittently arranged along the circumferential direction of).

Hereinafter, the formwork for manufacturing pile pile according to a preferred embodiment of the present invention for achieving the other object will be described in detail. Formwork for manufacturing the pile 100 for civil engineering and building foundation of the same configuration as the first embodiment is shown in Figures 8 and 9. 8 is a schematic perspective view of a formwork for forming piles according to a preferred embodiment of the present invention, and FIG. 9 is a schematic sectional view taken along line VII-VII of FIG. 8.

8 and 9, the formwork 200 for manufacturing the pile pile includes a formwork body 210 and a step forming portion.

The form body 210 is to form the pile body 10 of the buried pile 100 is formed long in one direction, the filling portion that can be filled with the material of the pile body 10 in the hollow form 211 is provided. The outer circumferential surface of the pile body 10 is shaped by the inner circumferential surface of the form body 210. On the other hand, when forming a hollow pile body, the form body 210 is mounted to a separate rotary device (d). That is, as shown in FIG. 8, when the form body 210 rotates at a high speed by the rotating device d, the material r of the pile body 10 in the charging unit 211, that is, concrete, rotates. When it is in close contact with the inner circumferential surface of the formwork body 210 by the centrifugal force and the concrete is cured in this state, the hollow pile body 10 is formed. The part shown with the virtual line of FIG. 9 is the part corresponding to the inner peripheral surface of the pile main body 10. FIG. In addition, when the reinforcing bar 12 and the catching net 30 is assembled in advance and placed in the charging unit 211 of the form body 210, the reinforcing bar 12 is hardened in the state where the concrete is hardened in the embedded state The pile body 10 as in the first to fourth embodiments is manufactured.

The step forming portion has a step with respect to the inner circumferential surface of the form body 210, that is, is formed in a direction crossing with respect to the longitudinal direction of the form body 210. In addition, the step forming portion is disposed along the circumference of the form body (210). The step forming portion is for forming the locking portion of the embedded pile 100, and has a shape corresponding to the shape of the locking portion. That is, in the case of manufacturing the locking projections 20 and 50 protruding from the locking portion as in the first and third embodiments, the step forming portion may have the inner circumferential surface of the form body 210 as shown in FIG. 9. It has a shape of the locking step forming portion 220 inserted concave. On the other hand, in the case of manufacturing the recessed portion into the recessed recessed grooves 40 and 60, as in the second and fourth embodiments, the step forming portion is formed with a recessed groove projecting convexly with respect to the inner circumferential surface of the form body 210. It will have a wealth (not shown) form. In addition, although the step forming portion is shown in a ring shape in FIGS. 8 and 9, the step forming portion is spirally formed along the inner circumferential surface of the form body 210 in order to make the engaging portion having the same shape as in the third and fourth embodiments. Is placed.

On the other hand, the annular engaging portion is arranged in a plurality of spaced apart from each other along the longitudinal direction of the embedded pile 100, correspondingly a plurality of annular stepped portion is also spaced apart along the longitudinal direction of the formwork body 210 is disposed. .

When manufacturing the pile 100 for civil and building foundations by the formwork 200 formed as described above, the stake body 100 and the engaging portion without taking the complicated way of manufacturing the engaging portion to combine the pile body separately There is an advantage that can be formed integrally very easily. In addition, the locking net 30 can be coupled to the hollow portion of the embedded pile 100 very easily.

As described above, the embedding pile for civil and building foundations according to the present invention has the effect of preventing the relative movement between the embedded pile and the grout material to increase the attachment strength by forming a locking portion having a step on the outer peripheral surface of the pile body have.

In addition, there is an advantage that the manufacturing pile can be manufactured very simply and economically by manufacturing the buying pile using the formwork for manufacturing the pile pile according to the present invention.

Claims (15)

A pile body formed in one direction as being embedded with a grout in a drilling hole formed by drilling the ground in a downward direction; And The hook portion is formed in a direction intersecting with respect to the longitudinal direction of the pile body so as to have a step with respect to the outer peripheral surface of the pile body; is disposed along the circumference of the pile body; and the adhesion strength between the pile body and the grout material Landfill pile for civil and building foundations, characterized in that the increase. The method of claim 1, The hook portion is a civil engineering and building foundation embedded pile, characterized in that the locking projection protruding with respect to the outer peripheral surface of the pile body. The method of claim 1, The hook portion is a civil engineering and building foundation embedded pile, characterized in that the engaging groove is inserted concave with respect to the outer peripheral surface of the pile body. The method according to claim 2 or 3, The latching portion is spaced apart from each other along the longitudinal direction of the pile body, The hook portion for civil and building foundations, characterized in that each engaging portion is disposed in a ring shape along the circumference of the pile body. The method according to claim 2 or 3, The latching jaw is embedded pile for civil engineering and building foundation, characterized in that disposed on the lower end of the pile body. The method according to claim 2 or 3, The hook portion is a civil engineering and building foundation embedded pile, characterized in that arranged spirally around the pile body. The method of claim 1, The pile body is hollow and provided with a hollow inside thereof, Civil engineering, characterized in that it further comprises a catching net disposed on a plane intersecting with respect to the longitudinal direction of the pile body, the both ends of the engaging bar is arranged to cross each other fixed to both sides of the inner circumferential surface of the pile body and Recessed pile for building foundation. The method of claim 7, wherein A plurality of hook bars forming the hook net is civil engineering and building foundation embedded pile, characterized in that disposed adjacent to each other along the longitudinal direction of the pile body. The method of claim 7, wherein The hook network is embedded pile for civil engineering and building foundation, characterized in that a plurality of spaced apart from each other along the longitudinal direction of the pile body. The method of claim 7, wherein Between the inner circumferential surface and the outer circumferential surface of the pile body is inserted a reinforcing bar elongated along the longitudinal direction of the pile body, the reinforcing bars are arranged a plurality of spaced apart a predetermined angle interval along the circumferential direction of the pile body, Both ends of the engaging bar is a pile for civil and building foundations, characterized in that fixed to the reinforcing bars respectively. In the formwork for manufacturing piles for manufacturing embedded piles to be embedded with grout in the drilling hole formed by drilling the ground downward, A hollow formwork body which is formed in one direction and is provided with a filling part inside so that the material of the embedded pile can be filled; And Formed pile manufacturing die comprising: a step forming portion formed in a direction crossing with respect to the longitudinal direction of the form body so as to have a step with respect to the inner peripheral surface of the form body disposed along the circumference of the form body. The method of claim 11, The step forming portion is embedded pile manufacturing die, characterized in that the locking jaw forming portion is inserted concave with respect to the inner peripheral surface of the formwork body. The method of claim 11, The step forming portion is embedded pile manufacturing dies, characterized in that the locking groove forming portion protruding with respect to the inner peripheral surface of the formwork body. The method according to claim 12 or 13, The step forming portion is formed a plurality of spaced apart from each other along the longitudinal direction of the formwork body, each step forming portion is formed for manufacturing pile piles, characterized in that arranged in a ring-shaped along the circumference of the form body. The method according to claim 12 or 13, The step forming portion is formed for forming piles, characterized in that arranged spirally along the circumference of the formwork body.

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