KR101925828B1 - Underground structure pressing system for reducing friction and construction method using the same - Google Patents

Abstract

The present invention relates to a friction-reducing underground structure press-fitting system, which comprises a press-in portion for pressurizing the underground and a guide portion for coupling the inner circumferential surface of the press-in portion while forming a clearance therebetween so that the underground structure is press- A guide member for guiding the guide member to pass through; And a friction reducing portion disposed between the underground structure and the ground so as to reduce the frictional force when the guide body and the underground structure are press-fitted by the hydraulic device.
According to the present invention, it is possible to easily press-fit an underground structure to be press-fit by reducing the friction between an underground structure and underground soil, and to minimize the relaxation area of the surrounding soil when the underground structure is press-fitted. And the like can be prevented from occurring.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an underground structure pressing system and a construction method using the same,

The present invention relates to a frictional reducing underground structure pressurizing system and a construction method using the same, and more particularly, to a frictional reducing underground structure pressurizing system capable of minimizing a relaxation area of a ground while facilitating construction by reducing frictional force between the ground and an underground structure System and a construction method using the same.

In general, construction work was used for the construction of pipelines. The installation method is suitable for waterworks pipes, gas pipes, communication pipes and pipes with a diameter of 600 mm or less, and is suitable for a method of burying a pipe by excavating the ground with an excavator such as a small fork.

However, if the ground installation method is applied to lay the pipe which traverses the underground to the road or the railroad which the vehicle or the train travels, it causes a lot of traffic inconvenience. In addition, it is necessary to accumulate the excavated soil at the construction site during the construction, which may occupy the road, which may interfere with vehicle traffic and cause safety accidents.

In order to solve such a problem, Korean Patent No. 10-0457905 discloses "Method and apparatus for pushing in large-diameter underground structures. The disclosed large-scale underground structure press-in method and its apparatus form a unit underground structure as a work space in the lower part of the ground, continuously pressurize the unit underground structure in a direction crossing the road or railway in the work space, To form an underground structure of the < RTI ID = 0.0 > The disclosed patent can prevent the problems that may occur in the open method because the underground structure is pressed in one direction along the work space without opening the underground.

However, the disclosed patent requires a high output of the propeller when forming an underground structure due to the frictional force between the soil and the underground structure when pressurizing the underground structure, and deformation due to high output may occur. Such deformation may cause a problem that the position where the underground structure is press-fitted is deformed or the main body is deformed.

Also, when the indentation of the underground structure is relaxed at the time of indentation, the subsurface settlement may occur at the upper ground where the underground structure is press-fitted after the underground structure is press-fitted. These ground subsidence can cause large-scale railway accidents due to orbit deformation in railway, deformation and breakage of asphalt on the road, and sink hole etc. may occur due to infiltration of rainwater or penetration water into the ground .

(Korean Patent No. 10-0457905, November 10, 2004)

An object of the present invention is to provide a friction-reducing underground structure press-in system capable of minimizing the relaxation area of the ground while reducing the frictional force between the ground and the underground structure, thereby facilitating construction and a construction method using the same.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a method for reinforcing a starting point and an end point of a ground for pressurizing an underground structure formed of a round steel pipe or a circular concrete pipe according to an embodiment of the present invention to a first toothed wall, And a hydraulic pressure device is disposed in a work space formed at the point of time to press the underground structure into the ground, A friction reducing type guide system comprising a press-in portion for pressurizing the underground and a guide portion for connecting the inner circumference of the rear end of the press-in portion while forming a gap to guide the underground structure through the underground through a hydraulic device Leading conductor; And a friction reducing portion disposed between the underground structure and the ground so as to reduce the frictional force when the guide body and the underground structure are press-fitted by the hydraulic device.

Here, the press-in portion is formed so as to be inclined downward from the top of the front end, and has a reinforcing member along the circumferential direction from the front end to the rear end of the inner circumferential surface; And a gap maintaining plate disposed along the circumferential direction between the press-fit portion and the guide portion to define a gap between the press-fit portion and the guide portion, while fixing the press-fit portion and the guide portion to define a movement region of the friction-

Here, the friction reducing portion includes a tip fixing portion formed of a single plate, welded at the inside of the guide body and extending rearward, and fixing the plate end to the first turret wall of the viewpoint.

Here, the distal end fixing part is formed as a plurality of segments on the horizontal supporting part formed on the first turret wall, and protrudes from the horizontal supporting part to guide the insertion of the underground structure; And a plate fixing part having one end fixed on the protruding surface of the circular supporting part and the other end projecting in a direction opposite to the press-fitting of the underground structure and fixed to the plate protruding in the direction of the first soil wall.

Here, the friction reducing portion may be a roll plate; A plurality of fixing portions extending from the inner circumferential surface of the press-in portion toward the radial center so as to connect the roll plate so as to be rotatable; A support frame for integrally supporting a roll plate fixed to the fixing portion by connecting adjacent fixing portions; And a leading end fixing part fixing the end of the roll plate extending in the first counter current wall direction at the time point.

Here, the distal end fixing part is formed as a plurality of segments on the horizontal supporting part formed on the first turret wall, and protrudes from the horizontal supporting part to guide the insertion of the underground structure; And a plate fixing part fixed at one end of the protruding surface of the circular supporting part and fixed at the other end to a roll plate protruding in a direction opposite to the pressing direction of the underground structure and protruding in the direction of the first counter current wall.

Here, the circular concrete pipe includes a friction reducing cover plate surrounding the circular concrete pipe; And a plurality of anchor bolts integrally connecting the friction reducing cover plate and the circular concrete pipe, wherein the anchor bolts are aligned and arranged in one direction along the space formed between adjacent friction reducing portions in the circumferential direction.

 A method for pressurizing an underground structure using a friction-reducing underground structure press-fitting system according to an embodiment of the present invention includes the steps of: (a) reinforcing a start point and an end point of a ground in which an underground structure is press-fitted with a first toothed wall, Spaced apart and vertically reinforcing the second toe wall, excavating the first toe wall and the second toe wall to form a work space, and disposing a hydraulic device in a work space formed at the point of time; (b) a frictional reducing part formed to be larger than an outer diameter of the first segment, a leading body disposed at the front end of the first segment, and at least one frictional reducing part disposed along the circumferential direction of the inner circumferential surface of the leading body, And pressing the leading body and the first segment into the ground at the rear end of the first segment; (c) claying the gravel inside the guide body to the outside in a state where the guide body and the first segment are press-fitted into the ground; (D) joining the tip of the second segment to the end of the first segment and press-fitting the trailing end of the second segment into the hydraulic device, and further soiling the gypsum inside the guide body (D) is repeated until the leading body passes through the end, and the underground structure connected to the ground penetrates through the ground.

Here, the friction reducing portion is formed of a roll plate, and is automatically disposed between the underground structure and the ground according to the press-in of the lead body.

Here, the friction reducing portion may be provided as a single plate, and may further include a step of welding a plate frame to the rear end inside the guide body.

The friction-reducing underground structure press-in system according to the present invention and the construction method using the same can reduce the friction between the underground structure and the underground soil so that the pressurized underground structure can be easily pressed into a small load. It is possible to prevent the ground subsidence and the like from occurring even after completion of the construction.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram depicting indentation of a ground of a friction-reducing underground structure press-fitting system according to an embodiment of the present invention;
2 is a perspective view showing a state in which a friction-reducing underground structure press-fitting system according to an embodiment of the present invention penetrates through the ground.
3 is a view in the "A" direction in FIG.
4 is a perspective view of a lead object of a friction-reducing underground structure press-fitting system according to an embodiment of the present invention.
5 is a view showing another second embodiment of the friction reducing section of the friction reducing ground structure according to the embodiment of the present invention.
6 is a perspective view showing a tip end fixing portion on the viewpoint side of the friction-reducing underground structure press-fitting system according to the embodiment of the present invention.
7 is a perspective view showing a tip end fixing portion on a viewpoint side of a friction-reducing underground structure press-fitting system according to a modified embodiment of the present invention.
FIG. 8 is a conceptual diagram for comparing a relaxation area of a friction-reducing under-ground structure press-fitting system according to an embodiment of the present invention and another method.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

Also, throughout the specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. Also, throughout the specification, the term " on " means located above or below a target portion, and does not necessarily mean that the target portion is located on the upper side with respect to the gravitational direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram depicting indentation of a ground of a friction-reducing underground structure press-fitting system according to an embodiment of the present invention;

1, a submerged underground structure press-fitting system according to an embodiment of the present invention presses an underground structure traversing a railway or a road to construct a pipe roofing to install a transverse underground tunnel, The present invention relates to a system and a method for pressurizing an underground structure in the ground so that the first earth wall 10 and the second earth wall 10 can be used as a first earth wall 10 and a second earth wall 10, The first and second walls 10 and 20 are excavated to form a work space and the work formed in the viewpoint 1 The hydraulic device 30 is disposed in the space so that the underground structure can be press-fitted along one direction. Here, a detailed description of the hydraulic device will be omitted.

At this time, an "H" file or a sheet file can be used when constructing the first toothed wall 10 and the second toothed wall, and construction of the first toothed wall 10 and the second toothed wall 20 is not limited thereto.

FIG. 2 is a perspective view showing a state where a friction-reducing underground structure press-fitting system according to an embodiment of the present invention penetrates through the ground, FIG. 3 is a view in the "A" direction in FIG. 2, FIG. 5 is a view showing another embodiment of the friction reducing section of the friction reducing ground structure according to the embodiment of the present invention. FIG.

2 to 5, the frictional-under-ground structure press-fitting system according to the embodiment of the present invention includes a guide body 100 and a friction reduction unit 200. The reference configuration at this time will be described with reference to Fig.

The lead body 100 includes a press-in portion 110 for pressurizing the underground G and a guide portion 120 coupled to the inner circumferential surface of the press-in portion 110 while forming a gap, And serves to guide the structure SP through the underground G while pressurizing the structure SP with the underground G. [ Here, the underground structure SP may be formed of a circular steel pipe or a circular concrete pipe.

The press-in portion 110 is formed to be inclined from the top to the bottom of the tip. As the press-in portion 110 is formed so as to be inclined from the top end to the bottom end, when the press-in portion is press-fitted into the ground, the press-in portion is sequentially pressed from the upper side to the lower side. In addition, it is possible to induce the gravel to be discharged to the outside based on the tilted angle even after the press-fitting, and it is possible to provide efficient excavation while preventing safety accidents caused by the collapse of the gravel.

The stiffener 111 is provided along the circumferential direction from the front end of the inner circumferential surface of the press-in portion 110 to the rear end. The reinforcing member 111 can prevent the press-fitting portion 110 from being deformed when the press-fitting portion 110 presses the ground.

The guiding portion 120 is inserted from the rear end of the press-in portion 110 toward the front end thereof to guide the friction-reducing portion 200 backward along one direction.

The gap holding plate 130 is disposed along the circumferential direction between the press-in portion 110 and the guide portion 120 to form a gap GA between the press-in portion 110 and the guide portion 120, And the guiding part 120 to thereby define a moving region of the friction reducing part 200. As shown in FIG. At this time, the gap holding plate 130 is arranged to extend forward toward the press-in portion 110 rather than the tip of the guide portion 120 so that the roll plates 210 described later are staggered along the circumferential direction, The interval between the plates 210 can be reduced.

The friction reducing portion 200 is disposed at least one or more in the circumferential direction of the inner circumferential surface of the guide portion 120 so as to extend between the gaps GA when the lead 100 and the underground structure SP are pressed by the hydraulic device 30. [ And is disposed between the ground structure (SP) and the ground (G) to reduce the frictional force.

3 and 4, the friction reducing unit 200 according to an embodiment of the present invention includes a roll plate 210 disposed along at least one circumferential direction of the inner circumference of the guide body 100, And includes a roll plate 210, a fixing portion 220, a support frame 230, and a leading end fixing portion 240, which extends between the gaps GA. At this time, the tip end fixing portion 240 will be described later in detail with reference to Fig.

The roll plate 210 is disposed between the underground G and the underground structure SP while being released as the guide body 100 and the underground structure SP move. Therefore, when the press-in portion 110 is press-fitted, the roll plate 210 is disposed between the underground structure SP and the underground G so as to reduce the frictional force to press-fit the press-in portion 110 and the underground structure SP more smoothly .

It is preferable that the thickness of the roll plate 210 is formed to be thinner than the thickness of the underground structure SP so as to correspond to the outer circumferential surface of the underground structure SP. That is, since the roll plate 210 does not have a structural role unlike the underground structure SP, it is sufficient if the strength is such that it is not broken due to the tensile force when the roll plate 210 is disposed between the underground G and the underground structure SP It is preferable that the thickness of the ground structure SP is 15 to 55% of the thickness of the underground structure SP. If the thickness of the roll plate 210 is less than 15% of the thickness of the underground structure SP, the roll plate 210 may be broken due to tensile force when the guide body 100 is press-fitted. On the contrary, if the area is formed in excess of 55%, it can not be deformed into a shape corresponding to the outer circumferential surface of the underground structure SP, and the flat plate shape is maintained as it is. Can cause the cause.

At this time, the roll plate 210 may be arranged in two rows along the axial direction of the lead body 100 as the first roll plate 210a and the second roll plate 210b. The first roll plate 210a and the second roll plate 210b arranged in two rows along the axial direction are arranged in a direction staggered from each other in the circumferential direction so that a gap between the roll plate and the roll plate adjacent to each other on the outer circumferential surface of the underground structure SP So that the gap is reduced. Therefore, the effect of reducing the friction between the ground structure (SP) and the ground (G) can be greatly increased.

Further, the surface of the plate 210 can be treated with a friction reducing coating to increase the friction reducing effect.

The fixing portion 220 extends from the inner circumferential surface of the press-in portion 110 toward the center of the radius so that the roll plate 210 can be rotated. At this time, the roll plate 210 is fixed to the fixing portion 220 in a state where the roll plate 210 is wound, and the roll plate 210 is mounted on the fixing portion 220 in accordance with the advancing speed of the lead 100 as the leading body 100 advances. The roll plate 210 is rotated. Therefore, it is possible to arrange the roll plate 210 without separate drive equipment such as a winder to place the roll plate 210 between the underground structure SP and the underground G. [

That is, when the plate is provided automatically by using a winder, it is difficult to accurately predict the press-in speed due to the presence of rocks and various types of soil in the ground. Therefore, the unrolling speed of the roll plate and the press- But they are different from each other. If the roll plate is continuously disposed in this state, the roll plate may be damaged due to excessive tensile force, or the roll plate may not be normally disposed, resulting in a further increase in frictional force.

Since the release speed of the roll plate 210 is determined according to the pressing speed of the lead body 100 as described above, the present invention prevents the roll plate 210 from being stably positioned between the underground structure SP and the underground G Can be deployed. Therefore, by reducing the friction between the underground structure SP and the underground G, it is possible to smoothly press the lead 100 into the underground structure SP while preventing the underground G around the underground structure SP, Can be easily press-fitted.

The support frame 230 is formed integrally with the adjacent fixing portions 220 by connecting loops to each other, thereby preventing the roll plate 210 from shaking when moving along one direction. Accordingly, the plurality of disposed plates 210 can be continuously provided along the rear side.

The friction reducing portion 200 according to another embodiment of the present invention is formed of a single plate and is welded inside the guide body 100 to extend rearward so that the first toothed wall 10a of the viewpoint 1 is provided with a plate 200 End fixing portion 240 for fixing the termination.

In the case where the friction reducing unit 200 is formed of a single plate as described above, the friction plate 200 is extended in one direction by a simple welding connection without the roll plate 210 and the structures for fixing the roll plate 210, The friction reducing effect can be obtained.

At this time, the thickness of the friction reducing portion 200 is preferably 15 to 55% of the thickness of the underground structure SP. When the plate is formed in such a range of thickness, the operator deforms in accordance with the outer shape of the underground structure SP inside the guide body 100, and the gap GA formed between the guide portion 120 and the press- You can insert it along.

If the thickness of the plate is less than 15% of the thickness of the underground structure SP, the plate 210 can be easily deformed, but fracture due to tensile force may occur when the guide body 100 is press-fitted. On the contrary, when the area is formed in excess of 55%, the operator can not deform the plate to the shape corresponding to the outer circumferential surface of the underground structure SP in the inside of the guide body, ) Can not be inserted along the same direction.

Hereinafter, the tip end fixing part 240 is provided in the first toothed wall 1 at the time and serves to fix the end of the plate 210, which will be described in detail with reference to FIG.

6 is a perspective view showing a tip end fixing portion on the viewpoint side of the friction-reducing underground structure press-fitting system according to the embodiment of the present invention.

Referring to FIG. 6, the leading end fixing part 240 according to the embodiment of the present invention includes a circular support part 241 and a plate fixing part 242.

The circular support portion 241 is coupled to the horizontal support portion 3 formed on the first wall 10a by a plurality of segments and protruded to guide the insertion of the underground structure SP.

The circular support portion 241 may be formed of "H" Here, the first trough wall 1 is shown as being formed in the shape of H, but it may be formed of a sheet pile.

One end of the plate fixing portion 242 is fixed on the protruding surface of the circular support portion 241 and the other end of the plate fixing portion 242 protrudes in the opposite direction to press the underground structure SP, And is fixed to a friction preventing portion extending in one direction.

Therefore, the plate fixing portion 242 is configured such that, when the guide body 100 and the underground structure SP move, the roll plate 210 or the frictional reducing portion 200 joined by a single sheet is not separated from the first toothed wall 1 And can be disposed between the underground structure SP and the ground S along one direction.

7 is a perspective view showing a tip end fixing portion on a viewpoint side of a friction-reducing underground structure press-fitting system according to a modified embodiment of the present invention.

7, the tip end fixing portion includes a circular support portion 241 and a plate fixing portion 242. Since the tip end fixing portion is the same as that described above, detailed description will be omitted.

The underground structure may be formed of a circular concrete pipe (CP). The outer circumferential surface of the circular concrete pipe (CP) is covered with the friction reducing cover plate (250) when the circular concrete pipe (CP) is formed. The friction reducing cover plate 250 may serve to increase the friction reducing effect with the roll plate 210 or the frictional reducing portion 200 coupled and extended by a single sheet.

That is, the circular concrete pipe (CP) is press-fitted into the circular concrete pipe (CP) in a state in which the circular concrete pipe (CP) is in direct contact with the roll plate (210) or the frictional reducing part The frictional reducing effect is greatly increased when the press-fitting is performed while being in contact with the roll plate 210 or the frictional reducing part 200 which is coupled and extended by a single sheet in a state of being wrapped around the circular concrete pipe CP, have.

In addition, the friction reducing cover plate 250 can prevent the waterproof performance from being deteriorated due to a minute crack when the circular concrete pipe CP is press-fitted, and can be formed of a thin plate having a thickness of 1 to 3 mm.

At this time, when connecting the friction reduction cover plate 250 to the circular concrete pipe CP, the concrete pipe CP and the friction reduction cover plate 250 are connected to the anchor bolt 251. At this time, the anchor bolts 251 are arranged in one direction along the space g formed between the adjacent plates 210 in the circumferential direction. Therefore, when the circular concrete pipe (CP) is inserted at the viewpoint, it can be inserted naturally without being in contact with the plate 210 without being resisted.

Thus, the friction-reducing underground structure press-fitting system according to the embodiment of the present invention can reduce the ground relaxation area of the underground G occurring when the underground structure G is press-fitted, as shown in FIG. 8B. Therefore, it is not necessary to further process the reinforcement around the underground structure even after the pressurization of the underground structure (G), so that the construction period and the construction cost can be greatly reduced.

In addition, since the hydraulic device 30 having a small capacity can be used to press the underground G and the underground structure SP even with a small pressure, it is possible to reduce the excavation area.

The method for constructing a friction-reducing underground structure press-fitting system according to an embodiment of the present invention may include a preparation step S100, a first press-fitting step S200, a first clay step S300, a second press- (S400). 1 to 7 can be referred to.

The work preparation step (S100) reinforces the starting point and the end point in the ground where the underground structure is press-fitted to the first toothed wall, vertically to the second toothed wall at a predetermined distance outside from the first toothed wall, 2 The excavator is excavated between the toothed walls to form a work space, and a hydraulic device is arranged in the work space formed at the point of time.

The first press-fitting step S200 is formed to be larger than the outer diameter of the first segment, and a lead body is disposed at the front end of the first segment, and at least one friction- The leading body and the first segment are pressed into the ground at the rear end of the first segment while reducing the frictional force between the one segment and the ground.

Thereafter, in the first clay step (S300), the soil and the first segment underground structure are squeezed out from the inside of the guide body in a state where the underground structure is pressed into the ground. At this time, excavation can be carried out using excavation and small excavation equipment.

In the secondary press-fitting and cladding step (S400), the front end of the second segment is joined to the rear end of the first segment, the rear end of the second segment is press-fitted into the hydraulic device, ; ≪ / RTI >

The secondary press-fitting and clay step S400 may be repeated until the underground structure passes through the end, so that the underground structure connected to the underground can be penetrated.

At this time, at least one plate is arranged along the circumferential direction on the inner circumferential surface of the lead forming the gap. At this time, the plate extends between the gaps and is fixed to the first earth wall of the viewpoint, and when the underground structure composed of the guide body and at least one or more is press-fitted by the hydraulic device, the plate is coupled along the longitudinal direction between the underground structure and the underground By extension, it reduces the friction between the underground structure and the ground.

At this time, the roll plate is automatically placed between the underground structure and the ground according to the press-in of the lead body. In addition, when the frictional reducing portion is formed of a single plate, it may be provided as a single plate, and may further include a step of welding the single plate frame at the inside of the lead body when extending to the downstream end.

When the steel pipe loop PL is continuously formed through the present invention as shown in FIG. 8B in order to form the structure S in the ground across a railroad or a road through such a method, have.

Conventionally, as shown in FIG. 8A, grout reinforcement (GR) is required for the relaxed region because the surrounding ground is relaxed due to the press-fit region friction. Such reinforcement causes a problem of increasing construction time as well as construction cost. If the relaxation area is not reinforced, the stability of the structure, railway and road facilities may be seriously problematic due to the subsidence of the ground.

However, since the relaxed area is greatly reduced as shown in FIG. 8 (b), the present invention does not require additional grouting reinforcement in order to reinforce the surrounding ground. Since the press-in can be easily performed, It can be done easily.

8B illustrates an example of application of a friction-reducing underground structure according to an embodiment of the present invention to construct a subterranean underground roadway structure. The friction-reducing underground structure in the underground structure according to the embodiment of the present invention Can be used independently.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate description of the present invention and to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

100: Lead body 110:
120: guide part 130:
200: Friction reducing part 210: Plate
220: fixing part 230: supporting frame
240: leading end fixing portion 250: friction reducing cover plate

Claims (10)

A first earth wall is reinforced by a first earth wall and a second earth wall is vertically spaced apart from the first earth wall by a predetermined distance to reinforce the ground wall and the second earth wall, A ground engaging friction reducing type guiding system in which a work space is formed by excavating between a turret wall and the second turret wall, and a hydraulic device is disposed in a work space formed at the time point to press the underground structure into the ground,
A guiding body having a press-in portion for press-fitting the underground and a guide portion coupled to the inner circumferential surface of the rear end of the press-in portion while forming a gap to guide the underground structure through the ground while pressurizing the underground structure through the hydraulic device; And
And a friction reducing portion disposed between the underground structure and the ground to reduce the frictional force when the guide body and the underground structure are press-fitted by the hydraulic device, the friction reducing portion being disposed at least one or more in the circumferential direction of the guide portion, ≪ / RTI >
The friction-
A plurality of roll plates disposed in the radial direction of the inner circumferential surface of the press-in portion;
A plurality of fixing portions extending from the inner circumferential surface of the press-fit portion toward a radial center to connect the plurality of roll plates so as to be rotatable;
A support frame for supporting the roll plate fixed to the fixing portion integrally by connecting the adjacent fixing portions to each other; And
And a leading end fixing portion for fixing the end of the roll plate extending in the first recirculating wall direction at the time point,
The roll plate includes:
Wherein the first roll plate and the second roll plate are arranged in two rows in a first roll plate and a second roll plate along the axial direction of the lead body, and the first roll plate and the second roll plate are arranged in radial directions staggered with each other in the circumferential direction Underground structure indentation system. The method according to claim 1,
The press-
A stiffener which is formed so as to be inclined from the upper side of the front end to the lower side and along the circumferential direction from the front end to the rear end of the inner circumference;
And a gap holding plate disposed between the press-fit portion and the guide portion in a circumferential direction to fix the press-fit portion and the guide portion while forming the gap between the press-fit portion and the guide portion to define a movement region of the friction- And a friction-reducing under-ground structure press-fitting system. delete delete delete The method according to claim 1,
The tip end fixing portion
A circular support portion coupled to the horizontal support portion formed on the first earth wall by a plurality of segments and protruding from the horizontal support portion to guide insertion of the underground structure; And
And a plate fixing part fixed at one end of the protruded surface of the circular supporting part and at the other end of the plate fixing part protruding in a direction opposite to the pressing of the underground structure and fixed to the roll plate protruding toward the first toothed wall Reduced ground structure indentation system. The method according to claim 6,
In the circular concrete pipe,
A friction reducing cover plate surrounding the circular concrete pipe; And
And a plurality of anchor bolts integrally joining the friction reducing cover plate and the circular concrete pipe,
Wherein the anchor bolt includes:
Wherein the friction-reducing underground structure press-fitting system is arranged in one direction along a space formed between adjacent friction-reducing portions in the circumferential direction. (a) reinforcing the starting point and the end point in the ground where the underground structure is press-fitted to the first toothed wall, vertically spaced apart from the first toothed wall by a predetermined distance, and reinforcing the second toothed wall vertically, Forming a work space by excavating between the earth walls, and disposing a hydraulic device in a work space formed at the time point;
(b) a radius of curvature of the first segment is larger than a radius of curvature of the first segment, a leading body is disposed at the front end of the first segment, and at least one frictional reducing portion disposed along the circumferential direction of the inner circumferential surface of the lead, And pressing the leading body and the first segment into the ground at a rear end of the first segment, while reducing frictional force between the ground and the ground;
(c) soiling the gravel inside the guide body in a state where the guide body and the first segment are press-fitted into the ground; And
(d) joining the tip of the second segment to the rear end of the first segment, press-fitting the rear end of the second segment with the hydraulic device, and then further sanding the gravel inside the guide body; / RTI >
The step (d) is repeated until the underground structure passes through the end point,
The friction-
A plurality of roll plates arranged in the radial direction of the inner peripheral surface of the press-in portion;
A plurality of fixing portions extending from the inner circumferential surface of the press-fit portion toward a radial center to connect the plurality of roll plates so as to be rotatable;
A support frame for supporting the roll plate fixed to the fixing portion integrally by connecting the adjacent fixing portions to each other; And
And a leading end fixing portion for fixing the end of the roll plate extending in the first recirculating wall direction at the time point,
The roll plate includes:
Wherein the first roll plate and the second roll plate are arranged in two rows in a first roll plate and a second roll plate along the axial direction of the lead body, and the first roll plate and the second roll plate are arranged in radial directions staggered with each other in the circumferential direction Indentation method of underground structure using underground structure indentation system. delete delete

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