KR101776916B1 - Horizontal casing propulsion type underground line construction method - Google Patents

Abstract

The present invention relates to a non-excavation underground electric line installation method using underground propulsion. A conduit (41) is installed inside a casing (40) by pulling and binding the conduit (41) to a pulling line (45) embedded in the casing (40) after a preliminary drilling hole with a small diameter is formed along a planned electric line path and burying the casing (40) in which the pulling line (45) is embedded while expanding the preliminary drilling hole at the same. According to the present invention, the stability and durability of the underground electric line can be improved. The breakage of the conduit (41), which may occur in the underground pulling process of the conduit (41) in the construction of the underground electric line, can be fundamentally prevented.

Description

{HORIZONTAL CASING PROPULATION TYPE UNDERGROUND LINE CONSTRUCTION METHOD}

The present invention relates to a non-detachable underground cable installation method using underground propulsion, in which a small diameter preliminary drilling hole is formed along a path of a planned electric line, and a preliminary drilling hole is provided, The conduit 41 is installed inside the casing 40 by inserting the conduit 41 to the pulling line 45 built in the casing 40 after the casing 40 is buried.

The burial method using the horizontal propulsion wire that is applied in the construction of the underground cableway can construct the underground cableway that crosses the river, the road or the railway as well as the construction of the underground cableway, And is also utilized in the construction of a submarine cable line for supplying electric power, and the related art is patent No. 836626 and the like.

FIG. 1 illustrates a construction process of an underground electric cable by way of a conventional electric cable including a No. 836626, which illustrates a construction process of an underground electric cable that traverses a river or a bottom of a strait.

As shown in FIG. 1, in the conventional horizontally-propelled underground cable construction method, after the erection opening 11 or the reaching opening 12 is drilled at the start or end point of the planned electric line, And a rod 22 to which a steering type excavation bit 23 is attached is inserted into a drafting hole 11 at the front end to form a small diameter preliminary drilling hole along the route of the planned electric line .

In the excavation of the preliminary excavation hole, the excavation bit 23 at the front end of the rod 22 connected to the excavation apparatus 21 enters the downward inclined state at the excavation opening 11 to continue excavation, When the target depth is reached, a curved section is formed in the excavation hole while the head of the excavation excavation bit 23 is slightly raised. When the excavation bit 23 reaches the horizontal state, It crosses the ground.

Thereafter, when the horizontal excavator completely traverses the river or strait and reaches a predetermined point on the path of the planned electric line, a curved section is formed in the excavator while slightly increasing the head of the steerable excavation bit 23 again, The excavation bit 23 is exposed to the arrival port 12 and the excavation bit 23 is connected to the entrance port 11 and the arrival port 12 The preliminary drilling ball is completed.

The bentonite suspension is supplied through the rod 22 connected to the excavation bit 23 and the bentonite suspension is injected at the excavation bit 23 so as to maintain the vacant wall and to reduce the estimated resistance, A bentonite handling facility 25 for supplying the bentonite suspension to the device 21 and collecting and recycling the bentonite suspension which is discharged and stored at the excavation opening 11 or the arrival opening 12 at the excavation opening or closing point As shown in FIG. 1, may be installed around the mouthpiece 11 and the mouthpiece 12.

The excavating device 21 on the side of the dredge 11 immediately after penetration of the preliminary drilling hole and the excavation bit 23 on the side of the reaching port 12 are connected to a plurality of rods 22, The exposed excavation bit 23 is separated and the excavation device 21 is operated in the reverse direction after connecting the reamer 31 and the plurality of conduit 41 as in the extract enlargement section of Fig. And at the same time, the conduit pipe 41 is pulled and buried.

At this time, the conduit 41 bound to the rear of the reamer 31 is connected through the swivel 35 so that the conduit 41 is rotated with the rotational force Is not transmitted but is pulled to the non-rotating state.

In addition, when large-diameter enlargement is required, it is also possible to repeat the process of re-opening the pre-drilled hole in the opposite direction after the first opening of the pre-drilled hole, and the conduit 41 The work is carried out by connecting the rod 22 to the reamer 31 and connecting the conduit 41 to the reamer 31 only at the time of final extension.

As the reamer 31 completely passes through the pre-drilled holes and reaches the ground, a plurality of conduits 41 that have been pulled are also buried completely across the lower ground of the planned section such as a river or strait. An underground conductor line is formed which forms the same cross-section as in the A 'cross-sectional view.

The preliminary excavating hole is formed by mounting the steering excavation bit 23 at the front end of the rod 22 and the reamer 31 connected to the conduit pipe 41 by the swivel 35 is connected to the rod 22 ), It is possible to efficiently construct a long-distance underground conductor line by a horizontal propulsion type underground cable installation method in which a large number of conduit pipes 41 are buried at once, However, the conventional horizontal propulsion type underground cable installation method has the following problems.

First, as shown in the sectional view taken along the line A-A 'in the lower part of FIG. 1, a plurality of conduit pipes 41 are basically buried in the ground, so that it is basically impossible to replace or extend the buried conduit pipes 41 I have.

In addition, the bundle of the conduit pipe 41 bounded by the swivel 35 behind the reamer 31 is pulled in a state of being in direct contact with the ground and the crushed stone material remaining in the excavation hole as well as the inner circumferential surface of the air hole. There is a possibility of damage to the cable 41, and there is a construction difficulty that requires a high degree of control and control of the tension acting on the conduit 41 at the time of traction.

In particular, since a plurality of conduits 41 are bundled and attracted to the reamer 31 in the form of a bundle, it is necessary to precisely adjust the speed of unwinding the individual conduits 41 on the ground, There is a limit in that it is practically impossible to assemble a heterogeneous conduit 41 having a different diameter or material.

In addition, when pieces of rock that have not yet been crushed go into the bundles of conduits 41 during the laying and pulling process, damages and breakage of the conduits 41 are caused, and there is a serious problem that the entire section must be reworked.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a horizontally-propelled underground cable installation method, in which a power generating opening 11 and a reaching opening 12 are respectively excavated on both sides of a planned underground power cable, A preliminary drilling step S10 of forming a small diameter preliminary drilling hole along the path of the planned electric line path while the rod 22 is repeatedly connected behind the excavation bit 23 inserted into the preliminary drilling hole 11, The reamer 31 is installed at the other end of the excavation apparatus 21 of the excavation apparatus 21 and the casing 40 having the draw line 45 is connected to the rear of the reamer 31 and then the reamer 31 is pulled A drawing step S20 of burying the casing 40 and a step of binding the conduit 41 to one end of the traction line 45 and putting the conduit 41 into the casing 40, And a wire installation step (30) for installing a conduit (41) inside the casing (40) by pulling the casing (40) How is the construction of a wire.

After the spreading step S20 is performed, one end of the casing 40 is sealed, and the pressure-feeding device is connected to the sealing portion, so that the compressed air is fed into the casing 40, The pressurized drainage step S21 is performed in which the stored water is discharged to the outside and the cylindrical body 60 having the protruding annular flange 61 adhered to the inner circumferential surface of the casing 40 is moved inside the casing 40, (S30) is performed after the residual water removal step S22 of collecting and discharging the residual water in the casing 40 is carried out.

The cylindrical body 60 is formed of a hollow container in which a plurality of water holes 63 are formed in the outer circumferential surface and the polymeric absorbent 70 is loaded in the cylindrical body 60. (40) Horizontal propulsion type Underground cable construction method.

It is possible to drastically improve the stability and durability of the underground cable line and to prevent the breakage of the conduit pipe 41 which may occur during the grounding process of the conduit pipe 41 when the underground cable is constructed. .

In addition, it is easy to replace and add the conduit pipes 41 constituting the underground conduit, and also to assemble the conduit pipes 41 having different diameters or different materials.

Figure 1 is a step-by-
2 is a step-by-step explanatory diagram
3 is an explanatory view of a conduit tube pulling method in a casing of the present invention
Fig. 4 is an explanatory view of the cleaning method of the inside of the casing of the present invention
5 is a perspective view of a cylindrical body
Fig. 6 is a perspective view of the hollow cylindrical cylindrical body of the present invention
7 is a perspective view of a hollow cylindrical portion cut perspective view of the present invention
8 is a vertical cross-sectional view of the hollow cylindrical body according to the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view showing the overall process of the present invention. As shown in FIG. 2, the present invention is a preliminary drilling step (S10) for forming a preliminary drilling hole reaching a reaching hole 12 from a dusting hole 11 .

In the preliminary drilling step S10, the excavation opening 11 or the reaching opening 12 is drilled on both ends of the planned electric line, and then the drilling bit 23 is attached to the end of the rod 22 connected to the excavating device 21 Wherein the excavation opening 11 and the reaching opening 12 respectively rotate at the entry point of the first excavation bit 23 and at the final arrival By specifying the point, it is not necessarily the same as the start point and the end point of the planned line.

In other words, the launching mouth 11 and the reaching mouth 12 are constructed by being respectively excavated at both ends of the planned underground electric line, the launching mouth 11 is constructed at the time of the planned front line, The position of the launching mouth 11 and the reaching mouth 12 can be set to the position on the transmission and distribution structure It is not determined by the supplier and the customer, but is selected in consideration of the site conditions such as the topography, as well as material procurement and equipment mobilization conditions.

The excavation bit 23 applied in the preliminary excavation step S10 is applied with a steering excavation bit 23 capable of adjusting the direction of excavation and is transmitted through the rod 22 to the ground excavator 21, So that a rotational force and a thrust force are imparted.

In the preliminary drilling step S10, the rod 22 is repeatedly connected behind the excavation bit 23 inserted into the power generating aperture 11, and a small diameter preliminary drilling hole is punched along the path of the planned electric wire path. The excavation bit 23 at the front end of the rod 22 connected to the excavation apparatus 21 enters the slope 11 at a downward slope and continues to excavate the excavator as shown in the upper part of FIG. When the bit 23 reaches a predetermined target depth, a curved section is formed in the excavation hole while the head of the steerable excavation bit 23 is slightly raised. When the excavation bit 23 reaches the horizontal state, Or across the lower part of the planned section of the strait or the like.

Thereafter, when the horizontal excavator completely traverses the river or strait and reaches a predetermined point on the path of the planned electric line, a curved section is formed in the excavator while slightly increasing the head of the steerable excavation bit 23 again, The excavation bit 23 is exposed to the arrival port 12 and the excavation bit 23 is connected to the entrance port 11 and the arrival port 12 The preliminary drilling ball is completed.

As shown in FIG. 2, a plurality of rods 22 are connected to the small-diameter preliminary drilling hole connecting the gashing mouth 11 and the reaching hole 12, The reamer 31 is connected to the tip of the rod 22 exposed to the sphere 12 to expand the excavation hole.

The bentonite suspension is supplied through the rod 22 connected to the excavation bit 23 and the bentonite suspension is injected at the excavation bit 23 so as to maintain the vacant wall and to reduce the estimated resistance, A bentonite handling facility 25 for supplying the bentonite suspension to the device 21 and collecting and recycling the bentonite suspension which is discharged and stored at the excavation opening 11 or the arrival opening 12 at the excavation opening or closing point As shown in FIG. 2, it may be installed around the mouth 11 and the mouth 12.

When the preliminary excavation hole connecting the excavation opening 11 and the arrival opening 12 is completed, the preliminary excavating hole is enlarged and the casing 40 in which the drawing line 45 is embedded is introduced into the ground. (S20) is performed.

That is, the reamer 31 is installed at the other end of the rod 22 penetrated into the preliminary drill hole, and the pull line 45 is embedded in the rear of the reamer 31 through the swivel 35 After the casing 40 is connected, the casing 40 is buried by rotating and pulling the reamer 31.

As described above, the excavation apparatus 21 on the side of the drafting opening 11 and the excavation bit 23 on the side of the arrival opening 12 are connected to each other by a plurality of mutually connected rods 22 immediately after penetration of the preliminary drilling hole The excavation bit 23 exposed to the arrival port 12 is separated in the exposing step S20 and the casing 40 is connected to the reamer 35 connected to the rear of the casing 40 via the swivel 35 31) to the tip of the rod (22).

Thereafter, the excavator 21 is operated in the reverse direction, and the excavator is expanded. At the same time, the casing 40 is pulled along the excavated pre-excavation hole. At this time, 40 are connected to each other through the swivel 35 so that the rotating force is not transmitted to the casing 40 despite the rotation of the rod 22 and the reamer 31, The traction line 45 is coupled to the inside of the leading casing 40 directly connected to the swivel 35 so that the casing 40 and the traction line 45 can be pulled together.

As the reamer 31 completely passes through the pre-drilled holes and reaches the ground, the casing 40 to be towed is also buried completely across the lower ground of the planned section such as a river or a strait. A plurality of casings 40 A large diameter drilling hole extending from the viewpoint of the planned electric line to the end point is constructed in such a state that the walls are completely protected by the casing 40. [

In addition, if it is necessary to enlarge the diameter of the preliminary drilling machine, it is also possible to repeat the process of re-opening the preliminary drilling machine in the opposite direction after the first drilling of the preliminary drilling machine. And the casing 40 is connected to the reamer 31 only at the time of final extension.

As described above, the casing 40 embedded in the spreading step S20 has the traction line 45 built in over the entire section. The traction line 45 is a means for pulling the conduit 41 in the subsequent process, High-strength wire rods such as steel stranded wires are applied.

When the expansion step S20 is completed, the conduit pipe 41 is connected to one end of the traction line 45 and the other end of the traction line 45 is connected to a winch 51 or the like, A wire installation step S30 for installing the conduit 41 inside the casing 40 is performed by pulling the wire 45 after the conduit 41 is inserted into the casing 40, An underground conductor line is formed which forms a cross section as in the B-B 'line sectional view of the lower end portion.

That is, not only the conduit 41 can be stably installed in the casing 40 penetrated into the ground, but also the breakage and breakage of the conduit 41, which is frequently occurred in the traction of the conduit 41 in the prior art, And it is possible to easily carry out the overall work such as the adjustment of the traction force, thereby making it possible to improve the convenience of construction compared to the prior art.

3, a plurality of conduits 41 may be combined and coupled to the towing line 45. A swivel 35 may be provided between the towing line 45 and the conduit 41, So that unnecessary rotation and rocking that may occur when the conduit pipe 41 is pulled can be suppressed.

Although not shown in the drawing, the preliminary pulling line 45 is further bound to the connecting portion of the wire conduit 41 and the pulling wire 45 in the step of installing the wire (S30) It is possible to easily carry out work such as the additional installation of the conduit 41 by pulling the towing line 45 together and retaining the preliminary towing line 45 together with the conduit 41 inside the casing 40 have.

4 to 8 illustrate the processes and the physical configuration of the pressure drainage step S21 and the residual water removal step S22 performed after the opening step S20 and before the wire installation step S30 will be.

As described above, the present invention can be applied not only to the construction of an underground conductor line traversing a river or a strait but also to the use of a bentonite suspension in the entire excavation process, and the handling and installation process of the casing 40 in a wet environment .

It is also possible to check the connection state of the casing 40 after removing the contaminants deposited in the jacketed casing 40 or after performing the above-described spreading step S20, A water pressure test may be performed in order to check the damage of the casing 40. In this process, a large amount of water is injected into the casing 40.

Therefore, it may be necessary to remove the water in the casing 40 before the electric wire installation step S30 in which the electric conduit 41 is installed in the casing 40. In the present invention, The water inside the casing 40 can be completely removed through the drainage step S21 and the residual water removal step S22.

First, in the pressure drainage step S21, one end of the casing 40 connected in the longitudinal direction is sealed as shown in the upper end of Fig. 4, and a pressure feeding device for supplying compressed air to the sealing portion is connected to the casing 40, the stored water in the casing 40 can be discharged to the outside.

4, the end of casing 40 on the side of mouth 11 is sealed to connect a pressure feeding device such as a compressor and the end of casing 40 on the side of mouth 12 is opened The compressed air is injected into the casing 40 from the side of the dust outlet 11 and the stored water in the casing 40 is discharged through the end of the opened casing 40 on the side of the arrival port 12 The connection point of the press-feeding device and the opening point of the casing 40 are not limited to the mouthpiece 11 and the mouthpiece 12, Lt; / RTI >

When the hydraulic pressure test is performed on the casing 40, the reservoir water is filled between the whole of the casing 40 extending from the dust collecting mouth 11 to the access port 12 after the completion of the hydraulic pressure test. In the above- So that most of the stored water can be discharged outside the casing 40.

In the course of the pressure drainage step S21, most of the stored water can be removed in the downward inclined section and the horizontal section of the casing 40 in the traveling direction of the compressed air. However, in the upward inclined section, A large amount of residual water must be formed in the casing 40 as the water is discharged or the water surface is formed and these residual water moves to the horizontal section of the casing 40 after the completion of the pressure drainage step S21, .

4, the cylindrical body 60 having the projecting annular flange 61 which is in close contact with the inner peripheral surface of the casing 40 is moved in the casing 40, The water remaining in the casing 40 can be completely removed by performing the step S22 of removing residual water by collecting and collecting the water.

5, in the residual water removing step S22, a plurality of projecting fins 61 are arranged on the outer circumferential surface of the cylindrical body in the axial direction of the cylindrical body 60, When the outer diameter of the projecting annulus 61 is made to coincide with the inner diameter of the casing 40 or when a stretchable material such as synthetic resin or rubber is applied as the material of the projecting annulus 61, So that the outer periphery of the projecting annulus 61 can be closely attached to the inner peripheral surface of the casing 40 when the cylindrical body 60 is inserted into the casing 40 .

4 and 5, inclined so that the diameter gradually increases from the front to the rear side is provided in the projecting annulus 61 so that smooth insertion into the casing 40 and smoothness in the casing 40 We plan activity.

Towing lines 45 are connected to the front end and the rear end of the cylindrical body 60 so that the pulling line 45 connected to the front end of the cylindrical body 60 is pulled by pulling means such as a winch 51 So that the cylindrical body 60 inside the casing 40 is moved forward so that the cylindrical body 60 in close contact with the inner peripheral surface of the casing 40 as in the enlarged portion in the ellipse of FIG. The projecting annulus 61 collects and transfers the remaining water in the casing 40 to the front side.

Particularly, in the cylindrical body 60 of the present invention, a plurality of projecting fins 61 spaced in the axial direction of the cylindrical body 60 are formed, so that the remaining water leaks to the rear side in the foremost projecting fins 61 Can also be transferred in a state in which residual water leaking into the space between the forwardmost projecting annulus 61 and the subsequent projecting annulus 61 is collected.

4, the cylindrical body 60 having passed through the casing 40 of the entire one section is separated from the traction line 45, is changed in direction and bound to the traction line 45, 40). By repeating the passage of the cylindrical body 60 through the casing 40, the remaining water in the casing 40 can be completely removed.

As shown in FIGS. 4 and 5, a traction line 45 is connected to the cylindrical body 60 not only at the front end but also at the rear end thereof, which is connected to the rear end of the cylindrical body 60 at the same time as pulling movement of the cylindrical body 60 In order to allow the pulling wire 45 to be housed in the casing 40. In this way, in repeating the step of removing the residual water S22 as well as the step of installing the wire S30 which is a subsequent step of the step S22 of removing the residual water The traction line 45 can be continuously utilized.

6 to 8 show that a polymeric absorption body 70 is loaded on a hollow cylindrical body 60 so that the residual water can be transferred in a state absorbed by the polymeric absorption body 70 inside the cylindrical body 60 , Thereby maximizing the efficiency of removing the electric current and reducing the number of repeated passes of the casing (40) of the cylindrical body (60) for the complete removal of the residual water, thereby improving the working speed and convenience.

As shown in Figs. 6 and 7, the cylindrical body 60 for loading the polymeric absorber 70 of the present invention is constituted by a hollow container in which a plurality of water holes 63 are perforated on the outer peripheral surface, The polymeric absorbent 70 is loaded in the cylindrical body 60 so that the remaining water permeated through the projecting fins 61 when the cylindrical body 60 is moved in the casing 40 passes through the water hole 63 Is introduced into the cylindrical body (60), and then absorbed into the polymer absorbent body (70).

7, the front end is closed, and the rear end is opened with a circular tube, and the cylindrical body 60 (see FIG. 7) And a plurality of water holes 63 penetrating the pipe wall of the cylindrical body 60 are formed.

A center bar 65 is joined to the center of the cylindrical body 60 in the axial direction of the cylindrical body 60. A thread is formed at the rear end of the center bar 65, The rear end of the center rod 65 is exposed to the rear side through the center portion of the closing member 67 and the fixing nut 68 is fastened to the rear end of the exposed center rod 65, The closing member 67 is tightly coupled to the rear end of the cylindrical body 60.

The polymeric absorber 70 is loaded in the inner space of the formed cylindrical body 60. In the present invention, the polymeric absorber 70 is formed by processing a polymer compound having absorption swelling (water swelling) A swollen bag filled with a granular or powdery absorbent-swellable polymer compound in a bag sewn into a water-permeable fabric is applied.

The polymer absorbent body 70 can absorb water several times to several tens of times its own volume, and, unlike other absorbent materials such as sponge, swollen and solidified after once absorbing the water, Once the remaining water in the cylindrical body 40 flows into the cylindrical body 60, the cylindrical body 60 is prevented from leaking to the outside of the cylindrical body 60 despite the movement of the cylindrical body 60.

FIG. 8 illustrates a state in which the polymer absorbent 70 is expanded by absorbing a considerable amount of residual water. When the residual water is absorbed as described above, the polymer absorbent 70 is expanded, and before the residual water removing step S22 It is preferable that the inside of the cylindrical body 60 is not completely filled when the polymer absorbent body 70 is inserted into the cylindrical body 60. [

11: Hwajinggu
12: Reach
21: Excavator
22: Load
23: Excavation bit
25: Bentonite handling equipment
31: Reamer
35: Swivel
40: casing
41: conduit
45: traction line
51: Winch
60: Cylindrical body
61: protruding flange
63: water ball
65: center rod
67: closing class
68: Fixing nut
70: polymer absorber
S10: preliminary drilling step
S20: Expansion phase
S21: Pressurized drainage step
S22: step of removing residual water
S30: Step of wiring installation

Claims (2)

In a horizontally propelled underground cable installation method,
The projecting mouth 11 and the reaching mouth 12 are respectively excavated at both ends of the planned underground conductor line and the rod 22 is repeatedly connected behind the excavating bit 23 inserted into the emanation opening 11, A preliminary drilling step (S10) of forming a small diameter preliminary drilling hole;
The reamer 31 is attached to the other end of the rod 22 penetrated into the preliminary drilling hole and the casing 40 having the pulling line 45 is connected to the rear of the reamer 31 (S20) of towing the reamer (31) and embedding the casing (40);
The conduit pipe 41 is connected to one end of the traction line 45 and the conduit pipe 41 is inserted into the casing 40 and then the traction line 45 is pulled to connect the conduit pipe 41 to the inside of the casing 40, (30) for installing the horizontal propulsion type underground cable (40).
2. The method of claim 1, wherein after the widening step (S20)
A pressure drainage step S21 in which one end of the casing 40 is sealed and a pressure feeding device is connected to the sealing portion so that compressed air is fed into the casing 40 to discharge the stored water in the casing 40 to the outside Lt; / RTI &
A residual water removing step S22 for collecting and discharging residual water in the casing 40 by moving the cylindrical body 60 formed on the outer circumferential surface of the casing 40 in the casing 40, Is performed,
And a wire installation step (S30) is performed.

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