Thrust pipes with improved excavation performance and their application in non-excavation tunnel construction methods

Abstract

The present invention relates to a thrust pipe, and more specifically, to a thrust pipe with improved drilling performance that can excavate quickly and safely by forming a plurality of pointed protrusions on the tip of a steel pipe. The propulsion tube with improved tunneling performance according to the present invention comprises: a propulsion tube body; and a plurality of propulsion projections formed protruding at regular intervals on the front of the propulsion tube body and having a horn shape with a tip that gradually narrows; wherein the propulsion projections are formed with a body of a triangular prism or a square prism, with one surface in surface contact with the inner circumferential surface of the propulsion tube body and welded, and have a horn shape with a tip that gradually narrows. The thrust pipe with improved drilling performance according to the present invention has the effect of enabling smooth penetration into ground such as weathered soil, weathered soil, and gravel by forming a plurality of thrust protrusions at the tip of the thrust pipe body, thereby dividing the first thrust into the thrust protrusions and the second thrust into the thrust pipe body, and forming the tip of the thrust protrusions into a pointed shape.

Description

Technology Field

[0001] The present invention relates to a thrust pipe, and more specifically, to a thrust pipe with improved tunneling performance that can excavate quickly and safely by forming a plurality of pointed protrusions on the tip of a steel pipe, and a method for constructing a trenchless tunnel using the same. Background Technology

[0003] Generally, thrust pipes are used to form conduits or tunnels for water and sewage systems, gas pipes, electrical conduits, communication pipes, railways, roads, etc., and the conduit or tunnel is formed by using a hydraulic jack to gradually advance and press the pipe in from the rear.

[0004] Published Patent No. 10-2006-0032163 relates to a lead pipe and thrust pipe assembly for a jacking method, wherein one end of an outer cylindrical steel pipe is fitted and coupled with the end of an adjacent first thrust pipe, and an inner cylindrical steel pipe is in contact with the other end of the outer cylindrical steel pipe; a certain number of hydraulic thrust jacks are installed inside the outer cylindrical steel pipe to obtain thrust using one side of the outer cylindrical steel pipe as a reaction force and to propel one side of the inner cylindrical steel pipe, and the tip is configured to be inclined to naturally form a slope at the end of the face.

[0005] Due to this structure, construction costs can be reduced as no additional rear equipment or large manpower is required other than hydraulic thrust jacks during the excavation of the thrust pipe assembly, and the excavation direction of the lead pipe can be easily adjusted so as not to be significantly constrained by the tunnel alignment. Furthermore, excavation is possible while naturally forming a slope at the face end due to the inclination of the lead pipe tip, thereby preventing the disturbed face end from collapsing due to earth pressure.

[0006] However, these conventional guide pipes have the problem of poor drilling efficiency depending on the soil type, as they are simply constructed in the shape of an open tube. Specifically, when the ground consists of weathered granite, weathered soil, or gravel, the front of the guide pipe gets stuck, hindering smooth drive-in and causing problems such as prolonged delays or the need to replace it with a larger hydraulic jack. Prior art literature

[0008] KR Published Patent Application No. 10-2006-0032163 (April 14, 2006) The problem to be solved

[0009] The present invention was devised to solve the problems of the prior art, and aims to provide a thrust pipe with improved tunneling performance that minimizes resistance generated at the tip of the thrust pipe, enabling smooth thrust regardless of soil type, and a trenchless tunnel construction method using the same. means of solving the problem

[0011] A propulsion pipe with improved tunneling performance according to the present invention for achieving the above objective,

[0012] propulsion tube body; and

[0013] It is characterized by including a plurality of propulsion projections formed at regular intervals on the front of the propulsion tube body, having a horn shape with a tip that gradually narrows.

[0014] In addition, the above-mentioned propulsion projection is characterized by having a square prism body, one side of which is welded in surface contact with the inner circumference of the propulsion tube body, and its tip forming a square pyramid shape that gradually narrows.

[0015] In addition, the above-mentioned propulsion protrusions are characterized by a repeating arrangement of long protrusions and short protrusions, wherein the long protrusions are pressed in first, the short protrusions are pressed in second, and then the tip of the propulsion tube body is pressed in third.

[0016] In addition, the above-mentioned propulsion projection is characterized by forming a receiving groove by recessing a part of it, and by bringing the inner surface of the propulsion tube body into contact with the receiving groove, so that the tip of the propulsion projection is positioned between the inner diameter and the outer diameter of the propulsion tube body.

[0017] In addition, the above-mentioned propulsion tube body is characterized by having a ring-shaped support formed on its inner surface to support the rear end of the propulsion projection.

[0018] A trenchless tunnel construction method using a thrust pipe with improved tunneling performance according to the present invention is,

[0019] A step of constructing a propulsion base, pouring lean concrete at the bottom of the propulsion base, and forming a reaction wall on one side;

[0020] A step of using a hydraulic jack to press in a propulsion pipe formed with horn-shaped propulsion protrusions that gradually narrow at the leading end at regular intervals, and sequentially pressing in a steel pipe at the trailing end;

[0021] A step of installing a nipple on a pressed steel pipe and injecting mortar through the nipple to grout the voids around the steel pipe;

[0022] Step of excavating the inside of the steel pipe, cutting the side to weld a waterproof steel plate and a fixing plate, and installing a vertical earth pressure support between the waterproof steel plate and the fixing plate;

[0023] A step of installing formwork inside a steel pipe, pouring concrete, and curing it;

[0024] It is characterized by including the step of sequentially excavating the interior of the structure and pouring concrete onto the excavated floor to form a lower slab. Effects of the invention

[0026] The thrust pipe with improved drilling performance according to the present invention has the effect of enabling smooth penetration into ground such as weathered soil, weathered soil, and gravel by forming a plurality of thrust protrusions at the tip of the thrust pipe body, thereby dividing the first thrust into the thrust protrusions and the second thrust into the thrust pipe body, and forming the tip of the thrust protrusions into a pointed shape.

[0027] In addition, by varying the protrusion lengths of the propulsion protrusions, sequential press-fitting is achieved, which has the effect of enabling propulsion even with a small-capacity hydraulic jack.

[0028] In addition, by positioning the tip of the propulsion projection between the inner and outer diameters of the propulsion tube body, frictional resistance is minimized, resulting in a smoother press-fitting effect. Brief explanation of the drawing

[0030] FIG. 1a is a perspective view illustrating the structure of a propulsion tube according to a first embodiment of the present invention. FIG. 1b is a front view illustrating the structure of a propulsion tube according to a first embodiment of the present invention. FIG. 1c is a side cross-sectional view illustrating the structure of a propulsion tube according to a first embodiment of the present invention. FIG. 2a is a perspective view illustrating the structure of a propulsion tube according to a second embodiment of the present invention. FIG. 2b is a side cross-sectional view illustrating the structure of a propulsion pipe according to a second embodiment of the present invention. FIG. 3a is a perspective view illustrating the structure of a propulsion tube according to a third embodiment of the present invention. FIG. 3b is an enlarged view of a key part illustrating a propulsion projection according to a third embodiment of the present invention. FIG. 3c is a front view illustrating the structure of a propulsion tube according to a third embodiment of the present invention. FIG. 3d is an enlarged cross-sectional view illustrating the structure of a propulsion tube according to a third embodiment of the present invention. FIG. 4 is a block diagram illustrating a trenchless tunnel construction method using a thrust pipe according to the present invention. FIGS. 5a to 5f are flowcharts illustrating the process of constructing a trenchless tunnel using a thrust pipe according to the present invention. Specific details for implementing the invention

[0031] Hereinafter, a preferred embodiment of a propulsion pipe with improved tunneling performance according to the present invention will be described in detail with reference to the attached drawings.

[0032] FIG. 1a is a perspective view illustrating the structure of a thrust pipe according to a first embodiment of the present invention, FIG. 1b is a front view illustrating the structure of a thrust pipe according to a first embodiment of the present invention, and FIG. 1c is a side cross-sectional view illustrating the structure of a thrust pipe according to a first embodiment of the present invention.

[0033] As illustrated in these drawings, the propulsion pipe (100) with improved tunneling performance according to the present invention comprises: a propulsion pipe body (110); and a plurality of propulsion protrusions (120) formed protruding at regular intervals on the front of the propulsion pipe body (110).

[0034] The above-mentioned propulsion projection (120) is formed by a body (121) of a triangular or square prism, with one side welded to the inner surface (111) of the propulsion tube body (110) in surface contact, and its tip (122) is formed in a gradually narrowing horn shape. Here, if the body (121) is formed as a triangular prism, its tip (122) has a triangular pyramid shape, and if it is formed as a square prism, it has a square pyramid shape.

[0035] The above-mentioned propulsion projection (120) and the propulsion tube body (110) are in a stable, close contact state by making surface contact with each other, and are integrated by welding along the edge of the propulsion projection (120) that contacts the propulsion tube body (110).

[0036] Here, the body (121) of the propulsion projection (120) may be formed as a triangular prism, a square prism, or a polygonal prism such that one side thereof can make surface contact with the propulsion tube body (110), but a circular prism shape is not recommended because line contact with the propulsion tube body (110) is not stable.

[0037] In this way, a plurality of propulsion protrusions (120) protruding forward from the propulsion tube body (110) are pressed in before the propulsion tube body (110), thereby dispersing the resistance generated at the tip and enabling smoother pressing. Additionally, as the tip (122) of the propulsion protrusion (120) is formed to be pointed, the resistance applied to the propulsion protrusion (120) is reduced, and especially in the case of gravel, it is not caught on the pointed tip (122) of the propulsion protrusion (120) but is naturally pushed to the side, thereby significantly improving the overall tunneling performance.

[0039] FIG. 2a is a perspective view illustrating the structure of a thrust pipe according to a second embodiment of the present invention, and FIG. 2b is a side cross-sectional view illustrating the structure of a thrust pipe according to a second embodiment of the present invention.

[0040] As shown in these drawings, the propulsion projection (120) consists of a long protruding propulsion projection (120a) and a short protruding propulsion projection (120b) arranged in a repeating pattern.

[0041] In this way, when the propulsion projection (120) is composed of a long propulsion projection (120a) and a short propulsion projection (120b), the long propulsion projection (120a) is first pressed in at the leading edge, the short propulsion projection (120b) is pressed in second, and finally the leading edge of the propulsion tube body (110) is pressed in third, so that the resistance generated at the leading edge of the propulsion tube is distributed over multiple stages, thus having the effect of being able to be pressed in with a hydraulic propulsion jack that is smaller than conventional ones.

[0042] Additionally, the propulsion tube body (110) may form a ring-shaped support (130) on its inner surface (111) to support the rear end of the propulsion projection (120). Here, the support (130) may be formed by protruding the propulsion tube body (110) itself inwardly or by attaching a separate body by welding. By forming the support (130) in close contact with the rear end of the propulsion projection (120) in this manner, the resistance generated in the propulsion projection (120) during press-fitting is transmitted to the propulsion tube body (110) through the support (130), thereby preventing the propulsion projection (120) from separating from the propulsion tube body (110). That is, without the support (130), all resistance must be overcome solely at the welded joint between the propulsion projection (120) and the propulsion tube body (110), so if the welded joint is defective, the propulsion projection (120) may separate.

[0044] FIG. 3a is a perspective view illustrating the structure of a thrust tube according to a third embodiment of the present invention, FIG. 3b is an enlarged view of a key part illustrating a thrust projection according to a third embodiment of the present invention, FIG. 3c is a front view illustrating the structure of a thrust tube according to a third embodiment of the present invention, and FIG. 3d is an enlarged cross-sectional view illustrating the structure of a thrust tube according to a third embodiment of the present invention.

[0045] As shown in these drawings, the tip of the propulsion projection (120) is positioned between the inner diameter and the outer diameter of the propulsion tube body (110).

[0046] That is, one side of the propulsion projection (120) is recessed to form a receiving groove (121), and the inner surface (111) of the propulsion tube body (110) is brought into contact with the receiving groove (123). Here, as the receiving groove (123) is formed, a step (124) is formed at the tip of the receiving groove (123), and the step (124) is in close contact with the tip of the propulsion tube body (110). In addition, it is preferable to form the depth of the receiving groove (123) to be half or more of the propulsion projection (120).

[0047] When the propulsion projection (120) formed in this way is welded in close contact with the propulsion tube body (110), the pointed tip of the propulsion projection (120) is located on the same line as the inner diameter tip of the propulsion tube body (110) or is located between the inner diameter and the outer diameter of the propulsion tube body (110).

[0048] The further the propulsion projection (120) is positioned inside the propulsion pipe body (110), the greater the frictional resistance during excavation; however, the further the propulsion projection (120) is positioned between the inner and outer diameters of the propulsion pipe body (110), the less frictional resistance is achieved, thereby improving excavation performance. Additionally, the step (124) of the receiving groove (123) engages with the tip of the propulsion pipe body (110), so that the resistance generated in the propulsion projection (120) during press-in is transmitted to the propulsion pipe body (110) through the step (124), thereby preventing the propulsion projection (120) from separating from the propulsion pipe body (110). In other words, if there is no step (124), all resistance must be overcome solely at the welded part, and if the welded part is defective, the propulsion projection (120) will separate.

[0050] FIG. 4 is a block diagram illustrating the process of constructing a trenchless tunnel using a thrust pipe according to the present invention, and FIGS. 5a to 5f are flowcharts illustrating the process of constructing a trenchless tunnel using a thrust pipe according to the present invention.

[0051] As illustrated in FIG. 4, the trenchless tunnel construction method using a thrust pipe according to the present invention comprises: a step of installing a thrust base and a reaction wall (ST100); a step of pressing in a thrust pipe and a steel pipe (ST200); a grouting step (ST300); a step of installing an earth pressure support (ST400); a step of pouring concrete inside the steel pipe (ST500); and a step of forming a lower slab (ST600).

[0052] The above step of installing the propulsion base and reaction wall (ST100) involves constructing a propulsion base by installing vertical piles (1), tie beams (2), and earth retaining plates on the excavation surface as shown in FIG. 5a, installing a propulsion frame (3) and a support (4) at the bottom, and forming a reaction wall (5) on one side. A hydraulic jack (6) is installed on the reaction wall (5) to allow the incoming propulsion pipe (100) and steel pipe (200) to be pressed in.

[0053] Here, the vertical pile (1) is installed by using an H-beam and driving it into the ground so that its lower end is buried, maintaining a parallel state. A plurality of tie beams (2) are horizontally connected at regular intervals to the vertical pile (1) and integrated. The tie beams (2) can be H-beams or similar materials and can be connected by bolting using brackets. That is, after attaching a bracket to one side of the vertical pile (1), the vertical pile and the bracket are integrated using bolts and nuts. Then, with the tie beam (2) placed on the top of the bracket, the tie beam (2) and the bracket are integrated using bolts and nuts. In this way, the tie beams (2) are connected parallel at regular intervals and integrated with the vertical pile (1). Earth retaining plates are installed between adjacent vertical piles (1). Since the vertical pile (1) uses an H-beam, vertical grooves are formed at both ends. By fitting both ends of the earth retaining plates, which are shaped like square plates, into these grooves, they are installed in a continuous, vertically close manner. These retaining plates are installed continuously between adjacent vertical piles to form a wall.

[0054] The above-mentioned thrust pipe and steel pipe insertion step (ST200) involves forcibly inserting the thrust pipe (100) using a hydraulic jack (6) installed on the reaction wall (5) as shown in FIG. 5b. Here, as described above, the thrust pipe (100) has a horn-shaped thrusting projection (120) that gradually narrows at a regular interval on the tip of the thrust pipe body (110), so that the first insertion is divided at the thrusting projection (120) and the second insertion is divided at the thrust pipe body (110). Since the tip of the thrusting projection (120) is formed to be pointed, it has the effect of enabling smooth insertion into ground such as weathered soil, weathered soil, and gravel.

[0055] The above propulsion projection (120) may be formed with a body (121) of a triangular or square prism, with one side welded to the inner surface (111) of the propulsion tube body (110) in surface contact, and the tip (121) may be formed in a horn shape that gradually narrows.

[0056] Additionally, the propulsion projection (120) may be arranged such that a long propulsion projection (120a) protruding long from the tip of the propulsion pipe body (110) and a short propulsion projection (120b) protruding short are repeatedly arranged so that when drilling, the long propulsion projection (120a) is pressed in first, the short propulsion projection (120b) is pressed in second, and then the tip of the propulsion pipe body (110) is pressed in third.

[0057] In addition, the above-mentioned propulsion tube body (110) has a ring-shaped support (130) formed on its inner surface (111) to support the rear end of the propulsion projection (120), so that the resistance generated in the propulsion projection (120) during press-fitting is transmitted to the propulsion tube body (110) through the support (130), thereby preventing the propulsion projection (120) from separating from the propulsion tube body (110).

[0058] In addition, the above-mentioned propulsion projection (120) is partially recessed to form a receiving groove (123), and the inner surface (111) of the propulsion tube body (110) is brought into contact with the receiving groove (123), thereby positioning the tip (122) of the propulsion projection (120) between the inner diameter and the outer diameter of the propulsion tube body (110), so that frictional resistance is minimized and smoother insertion is achieved.

[0059] Steel pipes (200) are sequentially pressed into the rear end of the propulsion pipe (100) using a hydraulic jack (6). A connecting ring is fitted to the joint of each steel pipe (200) and welded to integrate them all.

[0060] The above grouting step (ST300) involves installing nipples (N) at regular intervals on the steel pipe (200) as shown in FIG. 5c, and sequentially forcibly injecting mortar through the nipples (N) so that the voids created around the steel pipe (200) are filled with mortar (M).

[0061] The above earth pressure support installation step (ST400) involves excavating the inside of a steel pipe (200) as shown in FIG. 5d, sequentially cutting both sides in a square shape at regular intervals, and welding a waterproof steel plate (6) to the upper surface of the cut section of adjacent steel pipes (200) and a fixing plate (7) to the lower surface to integrate them. A vertical earth pressure support (8) made of a cylinder is interposed between the waterproof steel plate (6) and the fixing plate (7), and an anti-overturning plate is installed on the upper and lower parts of the earth pressure support (8). The waterproof steel plate (6), fixing plate (7), anti-overturning plate, and earth pressure support (8) installed in this manner are all welded together to integrate them. Then, all parts between the cut sections, that is, the uncut sections, are also sequentially cut, and the waterproof steel plate (6), fixing plate (7), and earth pressure support (8) are welded together in the manner described above to complete the installation.

[0062] The above step of pouring concrete inside the steel pipe (ST500) involves installing a sagging prevention support (9a), a steel plate formwork (9b), and a waterproof sheet inside the steel pipe (200) as shown in FIG. 5e, and then placing reinforcing bars inside the formwork (9b) and pouring concrete (C) to cure it.

[0063] The lower slab formation step (ST600) described above involves excavating the interior of the structure to form a tunnel once the concrete (C) inside the steel pipe (200) has cured, as illustrated in FIG. 5f. Permanent supports are installed on the floor of the excavated space, lean concrete is poured, reinforcing bars are placed on top of it, and then concrete is poured to complete the lower slab (S). Explanation of the symbols

[0065] 100 : Propulsion tube 110 : Propulsion tube body 111 : If you give it away 120 : Propulsion protrusion 120a: Long thrust protrusion 120b: Short thrust protrusion 121 : Body 122 : Tip 123 : Receiving groove 124 : Step 130 : Base 200 : Steel pipe

Claims

Claim 1 A propulsion pipe with improved tunneling performance comprising: a propulsion pipe body (110); and a propulsion projection (120) formed protruding at regular intervals in front of the propulsion pipe body (110) and having a horn shape with a tip (122) that gradually narrows; wherein the propulsion projection (120) is characterized by a repeating arrangement of a long propulsion projection (120a) protruding long from the tip of the propulsion pipe body (110) and a short propulsion projection (120b) protruding short, such that during tunneling, the long propulsion projection (120a) is pressed in first, the short propulsion projection (120b) is pressed in second, and then the tip of the propulsion pipe body (110) is pressed in third. Claim 2 Step (ST100) of constructing a propulsion base and pouring lean concrete at the bottom of the propulsion base, and then forming a reaction wall (5) on one side; Step (ST200) of sequentially pressing a propulsion pipe (100) in which long propulsion protrusions (120a) and short propulsion protrusions (120b) are repeatedly arranged using a hydraulic jack (6) so that during excavation, the long propulsion protrusions (120a) are pressed in first, the short propulsion protrusions (120b) are pressed in second, and then the front end of the propulsion pipe body (110) is pressed in third, and then a steel pipe (200) is pressed in sequentially at the rear end; Step (ST300) of installing a nipple (N) on the pressed steel pipe (200) and injecting mortar (M) through the nipple (N) to grout the voids around the steel pipe (200); Step (ST300) of excavating the inside of the steel pipe (200) and cutting the side to install a waterproof steel plate (6) and A non-excavation tunnel construction method using a thrust pipe with improved excavation performance, characterized by including the steps of: welding a fixing plate (7) and installing a vertical earth pressure support (8) between a waterproof steel plate (6) and a fixing plate (7) (ST400); installing a formwork (9b) inside a steel pipe (200) and pouring and curing concrete (C) (ST500); and sequentially excavating the interior of a structure and pouring concrete on the excavated floor to form a lower slab (S) (ST600). Claim 3 delete Claim 4 delete Claim 5 delete Claim 6 delete

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