KR20200013275A - A device that can be separated after entering a PHC pile using a steel pipe - Google Patents

Abstract

The present invention relates to a foundation construction method using a pretensioned spun high strength concrete (PHC) pile embedment technique after pre-excavation. A steel pipe connector is used to an upper end part of a lower PHC pile to connect a steel pipe to the surface of the ground, an upper steel pipe is extended to be able to be separated on a position corresponding to a foundation bottom, so the upper steel pipe can be withdrawn by being turned and separated from the lower PHC pile after pipe embedment. Therefore, costs and periods for foundation construction can be reduced with easier trench work. Moreover, in the case of an existing PHC pile embedment technique, since a PHC pile is embedded from the surface of the ground up to a foundation bottom, the exposed PHC pile needs to be cut off and discarded for trench work, which can lead to environment pollution and a higher material cost, but the foundation construction method can reduce environment pollution and material costs, and an upper steel pipe is turned to be separated from a PHC pile and withdrawn to install the PHC pile from a pile support layer necessary for a foundation of a building up to a foundation bottom.

Description

A device that can be separated after entering a PHC pile using a steel pipe}

The present invention relates to a method of embedding a prefabricated spun high strength concrete pile (PHC pile) and a basic construction method using the same, after which the upper steel pipe can be pulled out, and more specifically, the lower PHC pile and the upper steel pipe are combined. The present invention relates to a PHC pile embedding method and a basic construction method using the same, wherein the pile is formed to be separated from the lower PHC pile after entering, and the upper steel pipe is pulled out after the upper steel pipe is drawn out during the foundation construction.

In general, the building can be safely maintained only if the supporting power of the foundation is secured. In other words, in the case of soft ground, settlement of the upper or deep part of the foundation ground has a great influence on the safety of the building built on it, so all buildings must have sufficient support for the foundation ground to support the construction.

If the ground supporting the foundation is soft ground, the pile foundation reinforcement method is used to secure the bearing capacity. Among the foundation reinforcement methods, the pre-rigged PHC pile embedding method is used.

On the other hand, PHC pile is a hollow high strength concrete pile made of centrifugal force and is made by introducing prestress by pretensioning method. PHC pile is characterized by excellent bending resistance, resistance to vertical force and horizontal force. As it is possible to construct by using the pre-excavation method, it is widely used to construct the structure on the soft ground.

The above-mentioned pre-excavation PHC pile embedding method refers to a method of forming a support pile as a final hit by injecting the PHC pile to the support layer after pre-excavation and cement paste injection from the ground surface.

Therefore, if the building has a basement, the foundation is deep at the ground surface. In this case, the required PHC piles from the ground surface to the pile support layer should be purchased.

When the above method is used, the file is protruded during the destruction, and thus the work efficiency is greatly reduced, and the file waste is generated by removing unnecessary files secured for accessing the file to the bottom of the foundation, thereby affecting environmental pollution.

Therefore, in the present invention, when the building foundation is deep, the foundation bottom is deep at the ground surface. In this case, PHC piles are purchased after pre-excavation at the ground surface, and unnecessary PHC files are inserted from the ground surface to the base bottom, and the files should be removed when the ground is destroyed.

In addition, the file is protruded when digging, the work efficiency is greatly reduced.

By removing unnecessary files secured for accessing piles up to the bottom of the foundation, pile waste is generated, which affects environmental pollution.

In order to overcome this problem, there is a need for a method of locating only the required PHC pile length on the foundation of the building. Therefore, it is necessary to secure the required bottom PHC pile length from the base of the building to the pile support layer and to secure the bottom PHC pile to the foundation. After buying piles combined with connecting steel pipes, a device is needed to remove the steel pipes.

The present invention, which achieves the object as described above, and performs a task for eliminating the conventional defects, is associated with the lower PHC pile is embedded in the drilling hole excavated from the ground surface to the pile support layer, the PHC pile can be pulled out Upper steel pipe; The PHC pile is connected to the lower PHC pile from the base bottom to the pile support layer; The upper steel pipe is an upper steel pipe extending from the upper end of the lower PHC pile to be coupled to the ground from the ground surface to the base bottom; And a steel pipe connecting device and a steel pipe that are detachably connected by turning the upper steel pipe from the upper end of the lower PHC pile.

Here, the upper steel pipe may be connected to the steel pipe according to the base bottom depth.

In addition, if the upper steel pipe and the steel pipe connection device are removed after the pile is embedded, the lower PHC pile embedded from the pile support layer to the base bottom is covered with a protective cap to prevent soil from entering the center portion, and connecting bolts to each PC nut position. And insert the connecting bolt fixed to the lower PHC file into the locking groove of the connecting plate of the steel pipe connecting device and turn to the small groove of the locking groove so that the lower PHC file and the steel pipe connecting device and the upper steel pipe can be combined. It is characterized by.

The present invention described above is a steel pipe, which can be pulled out of the upper steel pipe, PHC pile coupled with the steel pipe connection

And according to the basic construction method using the same, by using a steel pipe connecting device at the upper end of the lower PHC pile to form a detachable extension of the upper steel pipe at a position corresponding to the base bottom by turning the upper steel pipe during the foundation construction to separate and pull out from the lower PHC pile By doing so, it is possible to more easily carry out the digging work, thereby reducing the construction cost and air for the basic construction.

In addition, according to the lower PHC pile combined with the drawable steel pipe and the basic construction method using the same, the upper steel pipe of the present invention can reduce other environmental pollution in the disposal after removal of the PHC pile to be buried from the ground surface to the base bottom when applying the existing method Has the effect.

1 is a pre-excavation (a) to drill a drilling hole 10 using a drilling equipment to explain the PHC pile embedding method according to the present invention; step PHC pile 100 and the protective cap 400, steel pipe connecting device ( 200), the steel pipe 500 is coupled to the purchase (b); at the bottom of the foundation base to remove the steel pipe 500 coupled with the steel pipe connection device 200, and remove only the PHC pile 100 and the protective cap 400 based Embedded in the bottom (c); step according to the step of forming the foundation (d) on the PHC pile 100 from the base,
Figure 2 is an exploded view for explaining the connection between the steel pipe connecting device 200, the steel pipe 500 to the PHC pile 100 and the protective cap 400 in accordance with the present invention,
3 is a perspective view of the PHC pile 100, the protective cap 400, the steel pipe connection device 200, the steel pipe 500 according to the present invention,
4 is a cross-sectional view of the PHC pile 100 and the steel pipe connection device 200 of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description for clearly describing the present invention will be omitted.

1 is a line drilling (a) through the drilling hole 10 as a drilling rig to explain the PHC pile embedded method applied to the steel pipe connection device 200 according to the present invention; steel pipe 500 to the step steel pipe connection device 200 ) Is combined PHC pile 100 (b); at the bottom of the step base steel pipe 500 coupled with the steel pipe connecting device 200 removed by removing the PHC pile embedded (c); A diagram illustrating a basic forming step (d),

2 is an exploded view showing a steel pipe 500, a steel pipe connection device 200, a protective cap 400 and a PHC pile 100, which the upper steel pipe 500 can be drawn according to an embodiment of the present invention.

Referring to Figures 1 and 2, this embodiment is basically an upper steel pipe connected to the lower PHC pile 100 and the steel pipe connecting device 200 is embedded in the drilling hole 10 excavated from the ground surface to the pile support layer 500; It is configured to include a lower PHC pile 100 coupled with the pullable upper steel pipe (500).

The lower PHC pile is a part installed in the depth from the base bottom depth to the pile support layer of the above-mentioned drilling hole 10 during the foundation construction, and mainly injects cement paste after pre-excavation (a) in the soft ground section and the steel pipe 500 is The connected PHC file 100 is entered.

The upper steel pipe 500 is extended from the upper end of the lower PHC pile 100 is installed from the ground surface to the base bottom.

In addition, the steel pipe connecting device 200 is fastened and connected to the upper end of the lower PHC pile 100 to form the upper steel pipe 500 extending from the upper end of the lower PHC pile 100 and together with the lower side. Combined lower PHC pile 100 and the upper steel pipe 500 is inserted into the drilled hole 10 integrally embedded and the upper steel pipe 500 is separated from the lower PHC pile 100 in the digging step, and the upper side To be withdrawn.

Referring to (e) in FIG. 3, the PC nut 110 is configured in the PHC file 100, and when the connecting bolt 300 is fastened, (g) the thermal bolt 300 is fixed to the PHC file as in a perspective view. Can be formed.

Referring to FIG. 3 (f), the protective cap 400 is formed of a circular plate through which the locking groove 410 is drilled.

Referring to FIG. 3 (h), the steel pipe connection device 200 includes a connection plate 210 having a locking groove 211 that can be engaged with the connection bolt 300 fixed to the upper end of the PHC pile 100. ; When the pile is inserted, the reinforcing steel plate 212 is welded so as to transfer the impact load to the PHC pile 100 at the time of hitting the steel pipe 500 with a hammer to put the pile into a putty, and when connecting the PHC pile 100. A guide steel pipe 220 slightly larger in diameter than the PHC pile serving as a guide; Consists of a joint 213 that can be connected to the steel pipe 500 and the bolt.

Referring to (i) in FIG. 3, the steel pipe 500 is composed of a steel pipe 500 and a steel pipe connection device 200 or a joint 213 that can be connected with a bolt to extend the steel pipe 500.

Referring to Figure 4 is a cross-sectional view of the PHC pile 100 and the steel pipe connection device 200 is combined.

As such, by using the steel pipe connecting device 200 at the upper end of the lower PHC pile 100, the upper steel pipe 500 is formed to be detachably extended at a position corresponding to the base bottom, and the pile is embedded and the upper steel pipe 500 is turned. By separating out from the lower PHC pile, it prevents the PHC pile from interfering with the conventional digging work so that the excavation work can be done more easily and easily, and the withdrawal without cutting the upper end of the conventional PHC pile By recycling the steel pipe connection device 200 and the upper steel pipe 500, it is possible to reduce the environmental pollution by reducing material costs and disposal due to the removal of PHC files.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications or changes can be made within the scope of the present invention and the accompanying drawings. It should be considered to be within the scope.

a: pre-excavation stage b: steel pipe embedding stage combined with PHC pile
c: Purchasing PHC file from the base bottom d: Forming step into the PHC file
e: Insert the connecting bolt into the PHC file PC nut f: Protective cap with a locking groove in the circular plate
g: Connecting bolt to PHC file and protective cap h: Steel pipe connection
100: PHC file 110: PC nut
200: steel pipe connecting device 210: connecting plate
211: engaging plate engaging groove 212: reinforcing steel plate
213: Fitting 220: Guide steel pipe
300: Connecting bolt 400: Protective cap
410: protective cap locking groove 500: steel pipe

Claims (4)

A steel pipe connecting device 200 and an upper steel pipe 500 coupled to the lower PHC pile 100 installed in the drilling hole 10 pre-excavated from the ground surface to the pile supporting layer;
An upper steel pipe (500) extending from an upper end of the lower PHC pile (100) and connected to the base bottom depth from the ground surface; At this time, the upper steel pipe 500 is a steel pipe having a joint 213 to adjust the length of the steel pipe 500 according to the depth from the ground surface to the base bottom; The upper steel pipe is coupled to the connection bolt 300 fixed to the upper end of the lower PHC pile 100, the upper steel pipe 500 is coupled to the steel pipe connecting device 200 from the upper end of the lower PHC pile 100 ( And a steel pipe extension member which is detachably connected by turning 500). The steel pipe connection device 200 of claim 1, wherein the steel pipe 500 coupled with the PHC pile 100 is embedded in the drilling hole 10, and the PHC pile 100 and the steel pipe 500 are detachable. According to claim 1, wherein the steel pipe 500 coupled to the PHC pile 100 is embedded in the drilling hole 10, the soil after separating the PHC pile 100 and the steel pipe 500, PHC pile 100 hollow portion Protective cap (400) to prevent inflow The method of claim 1, wherein the steel pipe 500 coupled to the PHC pile 100 is embedded in the drilling hole 10, the joint device 213 to enable the length adjustment of the steel pipe 500 from the ground surface to the base bottom is Steel pipe (500)

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