KR101727573B1 - Rotary penetration device of wedge extended type for circular pipe - Google Patents

Abstract

The present invention provides a wedge-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 a proper 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 multipoint pressurizing unit having a pressurizing stroke for clamping with operational force of the hydraulic unit; and at least one clamp module directly combined with the head shaft of the clamp operating head, and clamping the circular pipe by being attached to the inner surface of the circular pipe as a rotational radius is expanded by a wedge method during the operation of the hydraulic unit.

Description

[0001] The present invention relates to a wedge-

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, smoothly rotates on the ground in a state of maintaining clamping force generated evenly on the inner wall thereof The present invention relates to a circular tube rotary penetration apparatus of a wedge expansion type for allowing a user to penetrate a circular tube.

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 wedge expansion type circular pipe rotary penetration device for smoothly rotating a circular pipe made of concrete or plastic, which is susceptible to twisting shear fracture during rotation, to the ground while maintaining a 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 clamping device used for rotational penetration of a circular tube,

And a hydraulic pressure unit that is installed on the upper portion of the hollow head shaft and generates a hydraulic pressure; and a clamp drive unit that is provided with a multipoint pressure unit having a pressurizing stroke necessary for clamping by an operating force of the hydraulic unit, A head;

And at least one clamp module directly connected to the hollow head shaft of the clamp driving head and expanding its diameter by the wedge method during operation of the hydraulic unit to closely contact the inner surface of the circular tube to perform clamping .

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 hydraulic cylinder connected to the hydraulic pump and generating a driving force in a direction parallel to the Z axis;

A solenoid valve installed in a line connecting the hydraulic pump and the hydraulic cylinder to control the operation direction of the hydraulic cylinder;

And a controller electrically connected to the solenoid valve and having a communication unit for remotely controlling the solenoid valve from the outside.

In addition, the multi-

A head side module connection plate fixedly installed at a lower end of the hollow head shaft and having a plurality of pusher guide slots formed at regular intervals in a circumferential direction;

A multi-point pressurizing ram coupled to the outer diameter portion of the hollow headshaft so as to be slidable in the Z-axis direction and receiving the driving force of the hydraulic cylinder;

And a pusher having one end abutting the lower surface of the multipoint pressure ram and the other end inserted into the pusher guide slot.

Further, in the clamp module,

A clamp hollow shaft in which a plurality of inner wedge guide grooves are circularly arranged on an outer peripheral surface;

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

An inner wedge block coupled to the inner wedge guide groove and circularly arranged on the outer circumferential surface of the clamp hollow shaft so as to be movable in a direction parallel to the Z axis and having a plurality of inner wedges projecting radially outward;

And an outer expanding block having an outer wedge that is in contact with the inner wedge and is extended in a radially outward direction when the inner wedge block is moved down while being fitted to the inner wedge block to expand a radius thereof.

A spring retaining ring inserted into the upper and lower outer circumferential surfaces of the clamp hollow shaft;

And a return spring having one end fixed to the outer circumferential surface of the spring retaining ring at regular intervals and the other end fixed to the outer expanding block to exert a returning force after expanding and moving the outer expanding block.

In addition, a friction pad made of rubber is further provided on an outer surface of the outer expansion block.

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.

In addition, an outer expansion block rotating plate positioned between the adjacent outer expansion blocks and transmitting rotational force to the outer expansion block is integrally formed on the outer circumferential surface of the clamp hollow shaft.

According to the wedge expansion type circular pipe rotary penetration apparatus of the present invention, the clamping force is maintained by the uniform pressure by the wedge method on the inner surface of the circular pipe at the time of rotation penetration, and a circular pipe made of concrete or plastic which is particularly vulnerable to warp shear failure 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.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view of a circular tube rotary penetration apparatus according to the present invention, together with a circular tube constructed and associated therewith; FIG.
FIG. 1B is a view showing a construction state of a circular pipe by the circular pipe rotary penetration apparatus of FIG. 1A; FIG.
2 is a perspective view of an upper head side of a circular tube rotary penetration apparatus according to the present invention.
Figure 3 is a front view of Figure 2;
FIG. 4 is a partially exploded perspective view of a clamp driving head and a clamp module applied to a circular pipe rotary penetration apparatus according to the present invention. FIG.
5 is a sectional view taken along line AA in Fig. 3;
6A is a sectional view taken along the line BB of Fig. 3;
FIG. 6B is an operational view of a circular tube rotary penetration device clamping a circular tube in the sectional view of FIG. 6A. FIG.
7 is a perspective view of a clamp module applied to a circular tube rotary penetration apparatus according to the present invention.
8 is a sectional view taken along the line CC in Fig.
9 is a perspective view of an inner wedge block and an outer expansion block applied to a circular tube rotary penetration apparatus according to the present invention.
10 is a perspective view of a clamp module with an outer expansion block rotating plate according to the present invention.
11 is a cross-sectional view taken along line DD of Fig.
12 is an exploded perspective view of 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 pipe rotary penetration apparatus 10 according to the present invention is used, for example, for rotational penetration of a circular pipe 5 such as a PHC pile installed vertically and a sewer pipe constructed horizontally. 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 driving head 20 includes a hollow head shaft 12 having a Z axis passing through the center of rotation, an oil pressure unit 14 provided at the upper portion of the hollow head shaft 12 to generate a hydraulic pressure, Point pressing unit 16 having a pressing stroke required for clamping by the operating force of the multi-point pressing unit 16 is provided.

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 cylinder 144 connected to the hydraulic pump 143 and having an operating rod linearly moving in a vertical direction parallel to the Z axis and a hydraulic cylinder 144 connected to the hydraulic pump 143 and the hydraulic cylinder 144 A solenoid valve 145 installed in the pipeline for controlling the hydraulic cylinder 144 and a communication unit 146a for remotely controlling the solenoid valve 145. The solenoid valve 145 is electrically connected to the solenoid valve 145, And a controller 146 connected thereto. The solenoid valve 145 is switched by receiving an electrical signal from the controller 146 and controls the operating direction of the hydraulic cylinder 144 according to the switching position. At this time, when the circular tube rotary penetration apparatus 10 is inserted into the circular tube 5 as shown in FIG. 1B, the bottom surface of the head housing 141 has an area capable of transmitting pressure input to the circular tube 5.

Therefore, by controlling the operating direction of the hydraulic cylinder 144 by communicating with the controller 146 using a remote controller not shown, a thrust can be generated in the multipoint pressure unit 16 to be described later.

The multipoint pressure unit 16 includes a head side module connection plate 161 fixed to the lower end of the hollow head shaft 12 and having a plurality of pusher guide slots 161a formed at regular intervals in the circumferential direction, A multipoint pressing ram 162 slidably movably coupled to the outer diameter portion of the head shaft 12 to receive the operating force of the hydraulic cylinder 144 through the push rod 164, And a pusher 163 connected to the lower surface of the pressing ram 162 and the other end inserted into the pusher guide slot 161a.

The head-side module connecting plate 161 is a disk-shaped portion directly connected to the clamp module 30. The multi-point pressing ram 162 is formed in a cylindrical shape to be smaller than the outer diameter of the head side module connecting plate 161. The pusher 163 has a rectangular cross-section in the axial direction, but is not limited to this cross-sectional shape. For example, it may be circular or other polygonal cross-section.

Accordingly, when the multi-point pressurizing unit 16 receives the thrust by the operating force of the hydraulic cylinder 144, the multi-point pressing ram 162 moves downward from the outer circumferential surface of the hollow head shaft 12, The pusher 163 moves downward simultaneously. The downward movement of the pusher 163 causes an expansion radius of the clamp module 30. [

The clamp module 30 is directly connected to the hollow head shaft 12 of the clamp driving head 20. The clamping module 30 is radially expanded by the wedge method in the operation of the oil pressure unit 14, and is clamped by being in close contact with the inner surface of the circular tube 5 (see Figs. 6A and 6B).

The clamp module 30 includes a clamp hollow shaft 31 in which a plurality of inner wedge guide grooves 31a are arranged in a circular shape on the outer circumferential surface thereof and a clamp hollow shaft 31 which is mounted on the upper and lower ends of the clamp hollow shaft 31, Upper and lower module connecting plates 32 and 33 each having pusher guide slots 32a and 33a and a pair of inner wedge guide grooves 31a which are slidably engaged with the inner wedge guide grooves 31a and circularly arranged on the outer peripheral surface of the clamp hollow shaft 31, An inner wedge block (34) having a plurality of inner wedges (341) mounted movably in parallel with the axis and protruding in a radially outward direction and an outer wedge (351) interfaced with the inner wedge (341) An outer expansion block 35 that moves in a radially outward direction when the inner wedge block 34 is moved downward to expand the outer diameter of the clamp module 30 in a state where the inner wedge block 34 is fitted with the sliding groove 352, Configuration including 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. The inner wedge block 34 is constructed in the same number as the pusher 163 and the inner wedge block 34 is constructed and arranged directly below the pusher 163 in order to receive the thrust of the pusher 163. [ The inner wedge 341 and the outer wedge 351 are interlaced with each other at the same wedge angle. The wedge angle may range from 15 ° to 45 °, but may be increased or decreased beyond this range.

8, when the inner wedge block 34 receives the thrust S of the pusher 163 and moves downward, the inner wedge 341 descends downward along the outer wedge 351, All of the outer wedges 351 can not move downward by the lower module connecting plate 33 and widen in the radial lateral force P to expand the entire outer diameter. The clamping force of the clamping module 30 is exerted by all the outer wedges 351 in such a manner that the outer wedges 351 are forcedly in contact with the inner surface of the circular tube 5 as shown in FIG.

The spring clamping ring 37 is inserted into the upper and lower outer circumferential surfaces of the clamp hollow shaft 31 and has one end fixed to the outer circumferential surface of the spring clamping ring 37 at regular intervals and the other end fixed to the outer expanding block And a return spring (38) fixed to the outer side expansion block (35) and exerting a returning force after the expansion of the outer side expansion block (35).

Further, a friction pad 36 made of rubber may be further provided on the outer surface of the outer side expansion block 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 outer expansion block 35 adhered to the circular pipe 5 from being loose.

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 to be brought into contact with each other, 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. 1B, the circular pipe rotary penetration apparatus 10 is inserted into the hollow of the circular pipe 5.

5b, the outer expansion block 35 installed in the clamp module 30 is extended in the radial direction by operating the oil pressure unit 14 through the remote control, 35) side friction pad 36 are brought into close contact with each other.

At this time, the friction pads 36 provided to the circularly arranged plurality of outer expansion blocks 35 of the circular pipe rotary penetration apparatus 10 uniformly contact the inner wall of the circular pipe 5. [

A friction force is generated between the friction pad 36 and the inner wall of the circular pipe 5 so that the circular pipe 5 and the circular pipe rotary penetration device 10 are integrated .

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.

1B, a hollow shoe 6 having a hole at the center is attached to the distal end of the circular pipe 5, and the circular pipe 5 is inserted into the circular pipe 5, Insert the auger drill (2) into the hollow part.

The auger drill 2 (or the earth drill) forms a free surface by excavating the ground ahead of the circular pipe 5. 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 .

10 to 12, the present invention is applicable to an outer expansion block 35, which is positioned between adjacent outer expansion blocks 35 and 35 on the outer circumferential surface of the clamp hollow shaft 31 and transmits rotational force to the outer expansion block 35, And the block rotating plate 39 may be integrally formed. At this time, it is preferable that the outer expansion block rotary plate 39 is connected to the upper module connection plate 32 at the upper part and connected to the lower module connection plate 33 at the lower part.

Accordingly, the outer expansion block rotation plate 39 reduces the rotational burden of the inner wedge block 34 transmitted to the outer expansion block 35 when the circular pipe is rotated by the circular pipe rotation insertion device 10, The outer expanding block 34 can only push the outer expanding block 35 outward.

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: Multipoint pressure unit
161: Head side module connection plate
162: Multipoint pressure ram
163: pusher
20: drive head
30: Clamp module
31: Clamped hollow shaft
32, 33: upper and lower module connection plates
34: Inner side wedge block
35: outer expansion block
36: Friction pad
38: return spring
39: outer expansion block spindle

Claims (8)

A clamping device used for rotational penetration of a circular tube (5)
An oil pressure unit 14 provided with a hollow head shaft 12 having a Z axis passing through the rotation center and a hydraulic cylinder 144 provided at the upper portion of the hollow head shaft 12 to generate a hydraulic pressure, A clamp driving head (20) provided with a multi-point pressing unit (16) having a pressing stroke required for clamping by an operating force of the clamping driving head (14);
The clamping drive head 20 is directly connected to the hollow head shaft 12 and is clamped by being closely contacted with the inner surface of the circular tube 5 by expanding its diameter by the wedge method during operation of the oil pressure unit 14 At least one clamp module (30);
The multi-point pressurizing unit 16 includes a head-side module connecting plate 161 fixed to the lower end of the hollow head shaft 12 and having a plurality of pusher guide slots 161a formed at regular intervals in a circumferential direction; A multi-point pressing ram (162) slidably coupled to the outer diameter portion of the hollow head shaft (12) in the Z axis direction and receiving the driving force of the hydraulic cylinder (144); And a pusher (163) whose one end is in contact with the lower surface of the multipoint pressure ram (162) and the other end is inserted into the pusher guide slot (161a), respectively;
The clamp module (30) has a clamp hollow shaft (31) having a plurality of inner wedge guide grooves (31a) arranged in a circular shape on an outer circumferential surface thereof; Upper and lower module connecting plates (32, 33) mounted respectively on the upper and lower ends of the clamp hollow shaft (31) and having pusher guide slots (32a, 33a) circumferentially at regular intervals; A plurality of inner wedges (32a, 32b) which are coupled to the inner wedge guide grooves (31a) and circularly arranged on the outer peripheral surface of the clamp hollow shaft (31) so as to be movable in a direction parallel to the Z axis, An inner wedge block (34) having an inner wedge block (341); The inner wedge block 34 has an outer wedge 351 that is in contact with the inner wedge 341. The outer wedge 351 moves in a radially outward direction when the inner wedge block 34 is moved downward while being fitted to the inner wedge block 34, And a block (35). ≪ RTI ID = 0.0 > 31. < / RTI > The method according to claim 1,
The hydraulic unit (14)
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 hydraulic cylinder 144 connected to the hydraulic pump 143 and generating a driving force in a direction parallel to the Z axis;
A solenoid valve 145 installed on a line connecting the hydraulic pump 143 and the hydraulic cylinder 144 to control the operation direction of the hydraulic cylinder 144;
And a controller (146) having a communication part (146a) for remotely controlling the solenoid valve (145) from the outside and electrically connected to the solenoid valve (145). Device. delete delete The method according to claim 1,
A spring retaining ring 37 inserted into the upper and lower outer circumferential surfaces of the clamp hollow shaft 31;
A return spring 38 fixed at one end to the outer circumferential surface of the spring retaining ring 37 at a predetermined interval and the other end fixed to the outer expanding block 35 to exert a returning force after expanding the outer expanding block 35 Wherein the wedge-expanding-type circular tube rotation-percussion device further comprises: The method according to claim 1,
And a friction pad (36) made of rubber is further provided on an outer surface of the outer expansion block (35). The method according to claim 1,
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, Wedge extension type circular tube rotary penetration device. The method according to claim 1,
And an outer expansion block rotary plate 39 positioned between the adjacent outer expansion blocks 35 and 35 for transmitting rotational force to the outer expansion block 35 is integrally formed on the outer circumferential surface of the clamp hollow shaft 31 Characterized in that the wedge extension type circular tube rotary penetration device.

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