KR101727574B1 - Rotary penetration device of hydraulic jack type for circular pipe - Google Patents

Abstract

The present invention provides a hydraulic jack-expanded circular pipe rotating and inserting device capable of smoothly rotating and inserting a circular pipe, which is made of plastic or concrete vulnerable to distortional shear failure during rotation, into the ground while maintaining clamping force evenly generated in the inner wall of the pipe. According to an embodiment of the present invention, the clamp device for the rotational insertion of a circular pipe includes: a clamp operating head including a hollow head shaft having Z-axis passing through the center of rotation, a hydraulic unit installed in the upper part of the head shaft to generate oil pressure, and a clamp module connection flange installed in the lower part of the head shaft; and at least one clamp module combined with the clamp module connection flange to be directly connected with the head shaft of the clamp operating head, and clamping the circular pipe by being forcibly attached to the inner surface of the circular pipe as a rotational radius is expanded during the operation of the hydraulic unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rotary pipe penetration device,

The present invention relates to an apparatus for rotating a circular pipe into a ground, and more particularly to a circular pipe made of concrete or plastic which is susceptible to twisting shear fracture during rotation and smoothly rotating on the ground in a state in which the clamping force generated evenly on the inner wall is maintained. And more particularly, to a circular pipe rotary penetration apparatus of a hydraulic jack extension type which allows a hydraulic pipe to be inserted therein.

Generally, steel pipes used for construction of piles in construction or civil engineering are durable against twisting, but when the circular pipe (PHC pile, plastic sewer pipe, etc.) made of concrete or plastic material is pushed into the ground, tensile strength is weak and it is vulnerable to distortion .

Therefore, when a circular pipe such as a pile or a vertical pole is vertically penetrated to the ground surface, or when a tunnel is drilled horizontally with respect to the ground surface by a non-adherent method, a circular pipe such as a sewer pipe is inserted into the ground, or a circular pipe is slanted into the ground There arises a problem that a circular tube made of concrete or plastic material can not be applied.

That is, when a circular tube made of concrete or plastic material is rotated and held at the rear end of the circular tube, there is a large friction between the ground and the inner and outer walls of the circular tube, so that a large rotating force is required. Torsional failure occurs in a circular tube made of concrete or plastic material whose strength is much weaker than its compressive strength. For this reason, it is difficult to construct a concrete circular pipe which is vulnerable to torsional stress until now by the rotary penetration method.

As a background of the present invention, Korean Patent Registration No. 10-0994374 has proposed a 'rotationally-embedded file embedding apparatus and method thereof'. A cylindrical casing which is inserted in the hollow of the pile and whose upper end is coupled to the hinge, an excavation member rotatably press-fitted into the ground by the rotational force of the hover, and a lower portion The insertion portion of the casing and the connecting member is temporarily fixed, and therefore, the casing is rotated and excavated and the excavation member is fixed to the upper portion of the excavation member, When the member is inserted up to the selected depth and then the casing is pulled out, only the excavation member, the pile and the connecting member are buried in the ground, and the pile is easily buried.

However, in the background art of the former, because excavation is performed by the excavation member during excavation, there is a gap between the pile (or casing) and the perforation hole, and further grouting work is required. Also, since the excavation member and the connecting member, which are expected to have a considerable weight, are left on the ground after the installation, the installation cost increases. Also, while the background art of the former is a method of rotating the excavation member connected to the tip of the pile, the present invention differs in a manner of rotating the pile itself.

Another technology to be a background of the present invention is Korean Registered Patent Registration No. 10-0841735, which proposes a method of establishing a free piercing-free vibration-free screw pile based on rotation and indentation. This latter background technique has a problem that it is difficult to apply it to a conventional PHC file which does not have a spiral portion on the surface because it is a method of performing foundation work by forming a spiral portion on the surface of the pile. It is also difficult to apply to general sewer pipes made of plastic. Also, it is vulnerable to warp shear fracture because it holds and rotates the rear end of the screw made pile made of concrete material.

Korea Patent Registration No. 10-0994374 Korean Patent Registration No. 10-0841735

The present invention relates to a circular tube rotary penetration device of hydraulic jack extension type which is capable of smoothly rotating the circular tube made of concrete or plastic, which is susceptible to twisting shear fracture during rotation, to the ground while maintaining the clamping force generated evenly on the inner wall thereof The present invention has been made in view of the above problems.

According to a preferred embodiment of the present invention,

A rotary penetration apparatus used for rotational penetration of a circular tube,

A clamping mechanism provided with a flange for connecting a clamp module provided at the lower end of the hollow head shaft, a clamping mechanism provided at a lower end of the hollow head shaft, A head;

At least one clamp module which is fastened to the flange for connecting the clamp module and is directly connected to the hollow head shaft of the clamp driving head and is clamped by forcibly contacting the inner surface of the circular tube by expanding its diameter during operation of the hydraulic unit .

Further, in the above-described hydraulic unit,

A head housing mounted on an upper end of the hollow head shaft;

A battery mounted inside the head housing;

A hydraulic pump electrically connected to the battery and driven;

A solenoid valve connected to the discharge port side of the hydraulic pump to control the direction of the pressure oil;

And a controller electrically connected to the hydraulic pump and the solenoid valve, the controller having a communication unit for remote control from the outside.

Further, in the clamp module,

A clamp hollow shaft having a hollow and a predetermined length;

Upper and lower module connection plates mounted respectively at upper and lower ends of the clamp hollow shaft and having fastening holes at regular intervals in a circumferential direction;

A hydraulic jack arranged on the outer circumferential surface of the clamp hollow shaft so as to be arranged in an axial direction and circular shape so as to cause an operation stroke in a direction perpendicular to the Z axis and connected to the hydraulic pump through a hydraulic hose;

And a movable platen having an acupressure surface having the same curvature as that of the inner surface of the circular tube and connected to the operation rod of the hydraulic jack to closely contact the inner surface of the circular tube when the hydraulic jack is operated.

In addition, the hydraulic jack is further provided with a fixed bearing plate having a center axis of the clamp hollow shaft symmetrically opposite to the hydraulic jack, and having a bearing surface having the same curvature as the inner surface of the circular tube.

Further, the movable platen is further provided with a friction pad made of rubber.

Further, the fixing pad is further provided with a friction pad made of rubber.

Further, the at least one clamp module is characterized in that a plurality of bolts circularly arranged in the upper and lower module connection plates, which are brought into contact with each other, are inserted, and then they are coupled by fastening of the respective nuts.

According to the hydraulic jack extension type circular pipe rotary penetration apparatus of the present invention, the clamping force is maintained by the uniform pressure by the hydraulic jack method on the inner surface of the circular pipe during the rotation penetration, and a circular pipe made of concrete or plastic, It can smoothly penetrate the ground without breakage / fracture.

In addition, when the circular pipe rotary penetration apparatus of the present invention is applied to a concrete screw pile having a screw thread, noise and vibration are not generated, and holes larger than the pile diameter are drilled before the pile is inserted. The problem of reducing the frictional force of the main surface of the embedded pile is improved and the construction period is shortened. Of course, a concrete screw pile with thread can penetrate the ground with less torque.

In addition, since it is not necessary to drill the pore wall, it is not necessary to inject cement mortar to stabilize the pore wall during excavation, thus reducing the material cost.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
1 is a perspective view of a circular tube rotary penetration apparatus according to the present invention;
2 is a view showing a construction state of a circular pipe using the circular pipe rotary penetration apparatus of FIG. 1; FIG.
Figure 3 is a partially exploded perspective view of the upper head side of the circular tube rotary penetration apparatus of Figure 1;
Fig. 4 is an upper head side elevational view of the circular tube rotary penetration apparatus shown in Fig. 3; Fig.
5 is an exploded perspective view of a clamp module according to the present invention.
Fig. 6 is a cross-sectional view taken along the line AA in Fig. 2, and shows a state before the operation of the hydraulic jack.
Fig. 7 is a cross-sectional view taken along the line AA of Fig. 2, in which the circular tube is clamped during operation of the hydraulic jack;
Fig. 8 is an arrangement view of a hydraulic jack according to another embodiment of a clamp module applied to the present invention. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

As shown in FIG. 1, the circular tube rotary penetration apparatus 10 according to the present invention is used for rotational penetration of the circular tube 5. FIG. The circular pipe 5 includes, for example, a PHC pile installed vertically, a sewer pipe constructed horizontally, and the like. The sewer pipe may be made of synthetic resin including metal.

1 to 5, the circular tube rotary penetration apparatus 10 is composed of a clamp driving head 20 and at least one clamping module 30 directly connected to the clamping driving head 20. The number of the clamp modules 30 to be installed can be increased or decreased according to the length of the single circular pipe 5. [ The clamp drive head 20 may, for example, be connected to a drive of the auger drill rig to receive a rotational force.

The clamp drive head 20 includes a hollow head shaft 12 having a Z axis passing through a rotation center, an oil pressure unit 14 provided at an upper portion of the hollow head shaft 12 to generate a hydraulic pressure, And a flange 16 for connecting the clamp module provided at the lower end of the clamping module 12.

3, the oil pressure unit 14 includes a head housing 141 mounted on the upper end of the hollow head shaft 12, a battery 142 mounted inside the head housing 141, A solenoid valve 145 connected to the discharge port side of the hydraulic pump 143 for controlling the pressure oil direction and a communication unit 146a for controlling the pressure from the outside, A hydraulic pump 143 and a controller 146 electrically connected to the solenoid valve 145. The solenoid valve 145 is switched by receiving an electrical signal from the controller 146, and controls the discharge of the pressure oil according to the switching position. 2, the bottom surface of the head housing 141 has an area capable of transmitting the pressure input to the circular tube 5 when the circular tube rotary penetration apparatus 10 is inserted into the circular tube 5. [

Therefore, the hydraulic pump 143 can be driven and the direction of the solenoid valve 145 can be switched by communicating with the controller 146 using a remote controller not shown.

The clamp module 30 is directly connected to the hollow head shaft 12 of the clamp driving head 20. The clamp module 30 is radially expanded by the hydraulic jack 34 during the operation of the hydraulic unit 14 and is clamped by being brought into close contact with the inner surface of the circular tube 5 (see Figs. 6A and 6B).

The clamp module 30 includes a clamped hollow shaft 31 having a predetermined length and a plurality of fastening holes 32a and 33a formed at the upper and lower ends of the clamped hollow shaft 31 and spaced circumferentially at regular intervals Upper and lower module connecting plates 32 and 33 and a clamp hollow shaft 31 arranged on the outer circumferential surface of the clamp hollow shaft 31 in the circumferential direction and in the longitudinal direction so as to cause an operation stroke in a direction perpendicular to the Z axis, A hydraulic jack 34 connected to the hydraulic jack 34 via a hydraulic hose P and an oil pressure jack 34 connected to the operating rod 341 of the hydraulic jack 34 and having an oil pressure surface having the same curvature as the inner surface of the circular pipe 5, And a movable platen (35) which is in close contact with the inner surface of the circular tube (5) during operation.

Here, a well-known hydraulic coupling can be used for connection between the hydraulic hoses P provided between the clamp modules 30, and an opening / closing valve, not shown, is provided at a portion where the hydraulic coupling is connected to control the opening and closing of the hydraulic hose P can do.

The inner diameter of the clamp hollow shaft 31 is the same as that of the hollow head shaft 12 and the outer diameter thereof can be equal to or larger than that of the hollow head shaft 12.

A fixed bearing plate 37 may be further provided on the opposite side of the hydraulic jack 34 to have a symmetrical center axis of the clamp hollow shaft 31 and having a pressing surface having the same curvature as the inner surface of the circular tube 5. [ In this case, the movable pressure plate 35 and the fixed pressure plate 37 are brought into close contact with the inner surface of the circular tube 5 by the jack force of the hydraulic jack 34 as shown in Fig. 7, and clamping is performed between the clamp module 30 and the circular tube 5 Power is exercised. At this time, the outermost side of the fixed pressure roller 37 has the same radius of curvature as that of the inner surface of the circular tube 5. The fixed plate (37) is fixed to a platen fixing block (370) fixed to the outer circumferential surface of the clamp hollow shaft (31).

In the present embodiment, the hydraulic jack 34 and the fixed pressure plate 37 are provided on the outer circumferential surface of the clamp hollow shaft 31 at equal intervals with the same interval, but the present invention is not limited thereto. For example, it is also possible to have only the hydraulic jack 34 as shown in FIG. At this time, the hydraulic jacks 34 may be arranged in two to eight equidistant intervals on the circumference of the clamp hollow shaft 31.

On the other hand, the hydraulic jack 34 may further include a return spring S in the jack cylinder for returning the movable platen 35 upon release of the jacking force (clamping).

Further, a friction pad 36 made of rubber may be further provided on the outer surface of the movable platen 35. The friction pad 36 protects the inner wall of the circular pipe 5 made of concrete reinforcing bars at the time of clamping and at the same time prevents the movable pressure pipe 35 closely attached to the circular pipe 5 from being loose. Further, a friction pad 38 made of rubber may be further provided on the outer surface of the fixed pressure plate 37 to protect the inner wall of the circular pipe 5 and to increase frictional force.

Here, the one or more clamp modules 30 are inserted into the fastening holes 32c and 33c formed in the circular array on the upper and lower module connecting plates 32 and 33, And can be coupled by fastening of the nut N1.

A description will be given of a rotary penetration construction method of the circular pipe 5 using the circular pipe rotary penetration apparatus 10 constructed as described above.

First, as shown in FIG. 2, a circular pipe rotary penetration device 10 is inserted into the hollow of the circular pipe 5. As shown in FIG.

7, the movable pressure plate 35 and the fixed pressure plate (not shown) are mounted on the inner wall of the circular pipe 5 by operating the hydraulic pressure unit 14 mounted on the clamp module 30 by operating the hydraulic pressure unit 14 through the remote control. 37). At this time, the friction pads (36, 37) contact the inner wall of the circular tube (5) evenly.

Frictional force is then generated between the friction pads 36 and 37 and the inner wall of the circular pipe 5 to rotate the circular pipe 5 and the circular pipe 5, The tubular rotary intrusion device 10 is integrated and rotated in the ground 1.

At this time, since the circular tube rotary intrusion device 10 rotates in a state of being evenly adhered to the inner wall of the circular tube 5, the torsional stress is uniformly dispersed in the longitudinal direction of the circular tube 5. Therefore, the torsional stress can be prevented from being concentrated as compared with the conventional method in which the rear end of the circular tube 5 is held and rotated.

On the other hand, when the circular pipe 5 must be penetrated into the hard ground 1, a hollow shoe 6 having a hole at the center is attached to the tip of the circular pipe 5 as shown in Fig. 2, 10 is inserted into the hollow portion of the auger drill (2).

The auger drill 2 (or the earth drill) excavates the ground 1 ahead of the circular pipe 5 to form a free surface. When the circular pipe 5 is rotated, the hollow shoe 6 crushes the ground and advances. The outer soil of the hollow shoe 6 is pushed outward to increase the density of the soil around the circular pipe 5 to make the ground solid and the inner soil of the hollow shoe 6 to be pierced by the auger drill 2 The crushed gravel after being crushed by the auger drill 2 is pushed up on the rotating auger drill 2 and discharged to the outside of the circular pipe 5. [

Therefore, when the circular pipe rotary penetration apparatus 10 of the present invention is applied, the clamping force is maintained at an even pressure on the inner surface of the circular pipe 5 during the rotation penetration, and a circular pipe made of concrete or plastic, As shown in Fig. Also, the gravels are discharged on the inside of the circular pipe 5, and there is no gap between the circular pipe 5 and the excavation hole, and further grouting work becomes unnecessary.

In addition, when the circular pipe rotary penetration apparatus 10 of the present invention is applied to a concrete screw pile having a thread, noise and vibration are not generated, and holes larger than the pile diameter are drilled before the pile is inserted. The problem of reducing the frictional force of the main surface of the pile which is loosened and embedded is improved and the construction period is shortened. In addition, since it is not necessary to drill the pore wall, it is not necessary to inject cement mortar to stabilize the pore wall during excavation, thus reducing the material cost.

Of course, the circular pipe rotary penetration apparatus 10 can be applied to a pre-drilling method. In this case, after piercing a hole smaller than the pile diameter, the pile with the conical shoe is rotated and penetrated into the pore wall by using the circular pipe rotary penetration device (10), thereby increasing the frictional force .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

12: Hollow head shaft
14: Hydraulic unit
16: Flange for clamp module connection
20: clamp drive head
30: Clamp module
34: Hydraulic Jack
32, 33: upper and lower module connection plates
35: movable platen
37: Fixed pressure plate
36, 38: Friction pad

Claims (7)

A rotary penetration device used for rotational penetration of a circular tube (5)
A hollow head shaft 12 having a Z axis passing through the rotation center, an oil pressure unit 14 provided at the upper portion of the hollow head shaft 12 to generate a hydraulic pressure, A clamp driving head (20) provided with a flange (16) for clamp module connection;
And is connected to the clamp module connecting flange 16 and is directly connected to the hollow head shaft 12 of the clamp driving head 20. The circular tube 5 is connected to the clamping driving head 20, And one or more clamp modules (30) forcibly tightly contacting the inner surface of the clamp module (30).
The hydraulic unit (14) includes a head housing (141) mounted on the upper end of the hollow head shaft (12); A battery 142 mounted inside the head housing 141; A hydraulic pump 143 electrically connected to the battery 142 and driven; A solenoid valve 145 connected to the discharge port side of the hydraulic pump 143 to control the pressure oil direction; And a controller (146) having a communication unit (146a) for remotely controlling the hydraulic pump (143) and electrically connected to the solenoid valve (145);
The clamp module 30 has a hollow hollow shaft 31 having a predetermined length; Upper and lower module connecting plates (32, 33) mounted respectively at the upper and lower ends of the clamp hollow shaft (31) and having fastening holes (32a, 33a) circumferentially at regular intervals; And a hydraulic pump (143) connected to the hydraulic pump (143) via a hydraulic hose (P), wherein the hydraulic pump (143) is arranged on the outer circumferential surface of the clamp hollow shaft (31) (34); And is connected to the operating rod 341 of the hydraulic jack 34 and has a pressing surface of the same curvature as that of the inner surface of the circular tube 5. The movable pressure plate 34 is in close contact with the inner surface of the circular tube 5 during operation of the hydraulic jack 34, (35);
And a fixed bearing plate (37) having a bearing surface of the same curvature as that of the inner surface of the circular tube (5) with the central axis of the clamp hollow shaft (31) symmetrical to the hydraulic jack (34)
The one or more clamp modules 30 are inserted into the upper and lower module connecting plates 32 and 33 which are brought into contact with each other and a plurality of bolts B1 circularly arranged are inserted into the upper and lower module connecting plates 32 and 33, Hydraulic jack extension type circular tube rotary penetration device. delete delete delete The method according to claim 1,
Wherein the movable platen (35) is further provided with a friction pad (36) made of rubber. The method according to claim 1,
Wherein the fixed pressure plate (37) is further provided with a friction pad (38) made of rubber. delete

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