Casing installation method for a propulsion jack that expands the work space of the semi-shield method

Abstract

The present invention relates to a method for installing a casing for a propulsion jack that expands the working area space of a semi-shield method, wherein the propulsion jack for propelling an excavator is installed outside the working area to efficiently utilize the working area during tunnel excavation by the semi-shield method, and the casing that accommodates the propulsion jack is embedded outside the working area more simply in the ground and the casing is prevented from being deformed by earth pressure during the embedding process. More specifically, the method comprises a step of preparing the casing and the first propulsion jack; a step of inserting the hydraulic cylinder of the first propulsion jack into the casing; a step of connecting an air injection pipe to the casing; a step of installing the propulsion rod of the first propulsion jack accommodated in the casing on a reaction wall; a step of embedding the casing in the ground by operating the first propulsion jack; a step of separating the first propulsion jack after inserting the casing; and a step of installing the second propulsion jack inside the casing fixed to the reaction wall.

Description

Technology Field

[0001] The present invention relates to a method for installing a casing for a propulsion jack that expands the working area of ​​a semi-shield tunnel excavation method, wherein the propulsion jack is installed outside the working area to efficiently utilize the working area during tunnel excavation by the semi-shield method, and the propulsion jack is housed inside a casing that is buried outside the working area to accommodate the propulsion jack, thereby reducing the space occupied by the propulsion jack, allowing a long casing to be buried in a single operation, and preventing the casing from being deformed by earth pressure during the embedding process. Background Technology

[0002] Generally, the semi-shield method is an eco-friendly tunnel excavation technique developed to minimize noise, dust, ground subsidence, and traffic disruptions caused by conventional open-cut methods when constructing urban infrastructure such as water and sewage systems, electrical and communication lines, and gas pipelines. It involves excavating the ground by rotating an excavation cutter head mounted on the tip of a cylindrical excavator, preventing the collapse of the tunnel face through slurry or slurry pressure, and excavating the tunnel through a repetitive process of introducing a thrust pipe using a hydraulic jack installed within the work area and pressing it into the tunnel.

[0003] More specifically, the semi-shield method involves vertically excavating the ground to a planned depth to form a working shaft, positioning an excavator at the front of the horizontal pipeline formation section, and installing a hydraulic thrust jack on the rear reaction wall. Excavation is then performed by moving the excavator forward through the extension of the thrust jack. Once excavation is complete, the hydraulic thrust jack is retracted, a thrust pipe is inserted between the jack and the excavator, and the thrust pipe is moved forward by extending the jack. The jack is then retracted to insert another thrust pipe, thereby continuously connecting the thrust pipes to form the pipeline.

[0004] This semi-shield method has the advantage of eliminating the risk of collapse because a series of operations involving the continuous insertion of a thrust pipe by a hydraulic jack within the work shaft immediately after excavation proceeds continuously. Furthermore, it offers the benefits of minimal traffic obstruction, noise, dust, and vibration during tunnel work, as well as easy passage through soft ground without the need for separate auxiliary methods. It also features simple construction and easy management through repetitive operations, and its excellent safety and precision make it applicable to almost all soil types.

[0005] However, since the above semi-shield method involves installing a reaction wall on the wall of the working hole opposite where the horizontal pipe passes and installing a hydraulic propulsion jack consisting of a cylinder and a rod inside the working hole, the working hole must secure sufficient space for the excavator to be installed, as well as space for the aforementioned reaction wall, hydraulic propulsion jack device, and propulsion jack to operate. Therefore, a relatively large working hole must be excavated during the initial work.

[0006] Therefore, as a large work shaft must be formed for excavation work, there were difficulties when performing tunnel excavation work in densely populated urban areas, and there were problems such as increased construction costs and a longer construction period due to the large work shaft.

[0007] A technology to solve these problems by installing the hydraulic cylinder of a hydraulic propulsion jack outside the steel pipe of the working hole to reduce the installation space of the hydraulic propulsion jack and thereby significantly securing the space of the working hole is disclosed in Patent Publication No. 10-2018-0061630 by the present applicant and Japanese Patent Publication No. JP2003-286796.

[0008] The above prior art provides the effect of enabling more efficient use of the work port space by installing an inlet cylinder inside a casing embedded in the outer side of the steel pipe of the work port.

[0009] However, the aforementioned prior art has many difficulties in performing the task of driving a casing housing a hydraulic cylinder into the ground outside the steel pipe of the work opening.

[0010] Referring to FIG. 1, a reaction wall (a) is installed on one side wall inside the work hole (P) to install a propulsion jack (j), and the rear end of the casing (c) is connected to the front end of the propulsion rod (r) so that the casing (c) penetrates the work hole (P) through the propulsion of the propulsion rod (r) and is buried in the ground outside the work hole.

[0011] However, since the diameter of the working hole is limited, only a casing (c) of a length corresponding to the remaining space excluding the space occupied by the reaction wall (a) and the hydraulic propulsion jack (j) can be embedded. Consequently, due to the space occupied by the propulsion jack within the working hole, a long casing capable of accommodating a propulsion jack with a large propulsion capacity cannot be embedded. Therefore, construction is performed by first embedding a short casing corresponding to the stroke distance of the propulsion jack and then connecting another short casing to the rear end of this casing by welding. This results in a cumbersome and time-consuming construction process.

[0012] In other words, since the hydraulic cylinder must have a large capacity and length to propel a long thrust pipe or extend the thrust distance of the thrust pipe, conventional methods have the disadvantage that a long casing corresponding to a thrust jack with a large cylinder volume cannot be installed in a single operation. The problem to be solved

[0013] The objective of the present invention is to solve the above-mentioned problems by providing a method for installing a casing of a propulsion jack that expands the working hole space of a semi-shield method, wherein a long casing can be buried in the ground outside the steel pipe of the working hole in a single operation by fixing the propulsion rod of the hydraulic propulsion jack to the opposite side of the working hole through which the casing is inserted, inserting a hydraulic cylinder into the interior of the casing to be buried, and advancing the casing fixed to the rear flange by operating the propulsion jack to bury it in the ground. means of solving the problem

[0014] The present invention, as a means to achieve such an objective, comprises a first step of preparing a casing having a diameter and length into which a propulsion jack of a capacity for performing excavation work can be inserted, and a first propulsion jack for inserting the casing;

[0015] Step 2: Inserting the hydraulic cylinder of the first propulsion jack into the interior of the above casing, wherein the rear flange is tightly sealed to the rear end of the casing through a gasket to maintain airtightness;;

[0016] A third step of installing an air injection pipe to inject compressed air into the interior of the casing into which the hydraulic cylinder is inserted through the flange of the hydraulic cylinder;

[0017] Step 4: Installing a reaction wall on the inner side of the work opening opposite where the casing is embedded, and fixing the propulsion rod of the first propulsion jack thereto, thereby horizontally installing the casing with the hydraulic cylinder inserted so that it is aligned with the outer point of the work opening to be embedded;

[0018] Step 5, operating the first propulsion jack to advance the hydraulic cylinder using the reaction force of the propulsion rod fixed to the reaction wall, thereby penetrating the steel pipe of the work opening and horizontally inserting and burying the casing in the ground;

[0019] Step 6, when the insertion of the casing is complete, retracting the hydraulic cylinder of the first propulsion jack to release the vacuum inside the casing and separating the first propulsion jack from the casing;

[0020] Step 7, which includes installing a reaction wall fixed to the rear end of the casing on the inner wall of the working opening opposite the excavation hole when the first propulsion jack is separated, inserting a hydraulic cylinder of the second propulsion jack to propel the propulsion pipe into the casing so that the flange is supported by the reaction wall, and installing a pressure plate on the propulsion rod to propel the propulsion pipe.

[0021] The above provides a method for installing a casing of a propulsion jack that expands the working space of a semi-shield method, characterized by further including a 5-1 step in which compressed air from a compressor is injected into the casing through an air injection pipe penetrating the flange of the hydraulic cylinder of the first propulsion jack to maintain air pressure in the 5th step. Effects of the invention

[0022] According to the present invention, the hydraulic cylinder of the hydraulic propulsion jack is inserted into the interior of the casing to be buried, and the hydraulic cylinder and the casing are propelled simultaneously to bury the casing. As a result, a long casing can be buried in a single operation, making the work simple and efficient, and reducing the working time. Brief explanation of the drawing

[0023] FIG. 1 is a plan view of a workpiece illustrating a conventional method of inserting a casing. FIG. 2 is a block diagram of a casing installation method according to an embodiment of the present invention. FIG. 3 is an example diagram explaining the coupling process of the first propulsion jack and the casing. FIG. 4 is a plan view showing the propulsion rod of a hydraulic propulsion jack inserted inside a casing installed on a reaction wall. FIG. 5 is a planar example diagram illustrating the process of operating a hydraulic propulsion jack to cause the hydraulic cylinder and casing to simultaneously penetrate the working opening and be embedded in the ground. FIG. 6 is a cross-sectional view of the casing embedded in the ground outside the work opening. FIG. 7 is a planar example of a state in which a hydraulic cylinder and a reaction wall are installed to propel the thrust pipe. FIG. 8 is a side cross-sectional view of the state in which the thrust pipe is being advanced to the planned depth. Specific details for implementing the invention

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings, focusing on the parts necessary to understand the operation and function according to the present invention.

[0025] The embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all of the technical concepts of the present invention; therefore, it should be understood that various modifications capable of replacing them may exist at the time of filing this application.

[0026] In describing the embodiments of the present invention, unnecessary technical details that are well known in the technical field to which the present invention belongs and are not directly related to the present invention are omitted to ensure clearer communication without obscuring the essence of the invention. The present invention will be described in detail below with reference to the attached drawings illustrating specific embodiments.

[0027] FIG. 1 is a plan view of a work section illustrating a conventional method of inserting a casing, FIG. 2 is a block diagram of a casing installation method according to an embodiment of the present invention, FIG. 3 is an example diagram illustrating the coupling process of a first propulsion jack and a casing, FIG. 4 is a plan example diagram showing the state in which the propulsion rod of a hydraulic propulsion jack inserted inside the casing is installed on a reaction wall, FIG. 5 is a plan example diagram illustrating the process of operating the hydraulic propulsion jack so that the hydraulic cylinder and the casing simultaneously penetrate the work section (P) and are embedded in the ground, FIG. 6 is a cross-sectional view showing the state in which the casing is embedded in the ground outside the work section (P), FIG. 7 is a plan example diagram showing the state in which a hydraulic cylinder and a reaction wall are installed to propel the propulsion pipe, and FIG. 8 is a side cross-sectional view showing the state in which the propulsion pipe is propulsed to a planned depth.

[0028] The method for installing a casing of a propulsion jack that expands the working space of the semi-shield method of the present invention is,

[0029] A first step of preparing a casing (100) having a diameter and length into which a propulsion jack of a capacity to perform excavation work can be inserted, and a first propulsion jack (110) for inserting the casing (100); (S100)

[0030] A second step of inserting the hydraulic cylinder (111) of the first propulsion jack (110) into the interior of the casing (100), wherein the rear flange (112) is tightly attached to the rear end of the casing (100) so as to maintain airtightness through a gasket (113); (S200)

[0031] A third step of installing an air injection pipe (150) to inject compressed air into the interior of the casing (100) into which the hydraulic cylinder (111) is inserted through the flange (112) of the hydraulic cylinder (111); (S300)

[0032] Step 4: installing a reaction wall (160) for casing propulsion on the inner side of the work opening (P) opposite where the casing (100) is embedded, and fixing the propulsion rod (114) of the first propulsion jack (110) to it so that the casing (100) with the hydraulic cylinder (111) inserted is horizontally installed so as to be aligned with the outer point of the work opening (P) to be embedded; (S400)

[0033] Step 5 (S500) of operating the first propulsion jack (110) to advance the hydraulic cylinder (111) using the reaction force of the propulsion rod (114) fixed to the reaction wall (160) and inserting the casing (100) horizontally into the ground while penetrating the steel pipe (P1) of the work area (P);

[0034] Step 6, when the insertion of the casing (100) is complete, retract the hydraulic cylinder (111) of the first propulsion jack (110) to release the vacuum inside the casing (100) and separate the first propulsion jack (110) from the casing (100); (S600)

[0035] Step 7, which includes installing a reaction wall (170) for propulsion pipes that is fixed to the rear end of the casing (100) when the first propulsion jack (110) is separated, on the inner wall of the opposite working hole (P) of the excavation hole, inserting a hydraulic cylinder (210) of a second propulsion jack (200) to propel the propulsion pipe (300) into the casing (100) so that the flange (211) is supported by the reaction wall (170) for propulsion pipes, and installing a pressure plate (213) for propulsion pipes (300) on the propulsion rod (212); (S700)

[0036] The above 5th step is characterized by further including a 5-1 step of maintaining air pressure by injecting compressed air from a compressor into the interior of the casing (100) through an air injection pipe (150) that penetrates the flange (112) of the hydraulic cylinder (111) of the first propulsion jack (110). (S500-1)

[0037] The first step (S100) of the present invention as described above is a step of preparing a casing (100) having a diameter and length into which a second propulsion jack (200) of a capacity for performing excavation work can be inserted and accommodated, and a first propulsion jack (110) for inserting a casing having a smaller capacity than the second propulsion jack (200) capable of inserting the casing (100) into the ground.

[0038] Since the first propulsion jack (110) is used to insert the casing (100) into the ground, it is used to have a smaller capacity than the second propulsion jack (200) which propels a large propulsion pipe.

[0039] Accordingly, when the hydraulic cylinder (111) of the first propulsion jack (110) is inserted into the casing (100), a space is formed in which the compressed air of the 5-1 stage can be filled.

[0040] The second step (S200) of the present invention is a step of inserting a hydraulic cylinder (111) of the first propulsion jack (110), wherein the hydraulic cylinder (111) is inserted such that the protruding rear flange (112) of the hydraulic cylinder (111) is in close contact with the rear end of the casing (100), and a sealing gasket (113) is placed on the contact surface so that the compressed air filled in step 5-1 does not leak, thereby allowing the compressed air inside the casing (100) to maintain a constant air pressure.

[0041] The third step (S300) of the present invention is a step of installing an air injection pipe (150) to inject compressed air into the interior of a casing (100) into which a hydraulic cylinder (111) is inserted through a flange (112) of a hydraulic cylinder (111), thereby allowing compressed air from a compressor to be introduced through the air injection pipe (150). (Fig. 1)

[0042] The fourth step (S400) of the present invention is a step of fixing the first propulsion jack (110) inserted into the casing (100) to a reaction wall (160) installed on the inner side of the working hole (P) opposite to where the casing (100) is embedded, by fixing the propulsion rod (114) of the first propulsion jack (110) to the reaction wall (160) so that the casing (100) into which the hydraulic cylinder (111) is inserted is installed horizontally so as to be aligned with the insertion depth on the outer side of the working hole (P), thereby completing the preparation work for inserting the casing (100). (Fig. 2)

[0043] Here, the first propulsion jack (110) is characterized by being installed such that, contrary to the normal operation in which the propulsion rod (114) advances, the propulsion rod (114) is fixed to the reaction wall (160) and the hydraulic cylinder (111) is advanced by the supporting force of the reaction wall (160) to simultaneously advance the casing (100).

[0044] As a result, the casing (100) containing the hydraulic cylinder (111) moves forward simultaneously, allowing the casing (100) to be embedded in the ground.

[0045] The fifth step (S500) of the present invention is a step of burying the casing (100), which has been prepared for insertion through the fourth step, into the ground by the first propulsion jack (110). When the first propulsion jack (110) is operated, the hydraulic cylinder (111) advances by the reaction force of the propulsion rod (114) fixed to the reaction wall (160), and is inserted horizontally into the ground and buried together with the casing (100) while penetrating the steel pipe (P1) of the work section (P). At this time, since the rear end of the casing (100) is in a state of airtight contact with the flange (112) of the hydraulic cylinder (111), when the hydraulic cylinder (111) advances, the casing (100) advances forward by the flange (112) and is buried in the ground. (Fig. 3)

[0046] In this fifth stage, when the casing (100) is inserted into the ground and buried by the operation of the first propulsion jack (110), compressed air from a compressor is injected into the interior of the casing (100) through the air injection pipe (150) to maintain air pressure between the hydraulic cylinder (111) and the casing (100). The air pressure prevents the casing (100) from being deformed by surrounding soil pressure when the casing (100) is inserted into the ground by the advance of the hydraulic cylinder (111) by the first propulsion jack (110).

[0047] That is, since the casing (100) inserted into the ground and buried only serves to accommodate the second propulsion jack (200), there is no need to use a casing (100) with high strength to reduce construction costs, and since a casing (100) with a relatively thin thickness is used, there is a risk that it may be deformed by earth pressure during the insertion process by the first propulsion jack (110).

[0048] In this way, if the casing (100) is deformed by earth pressure, it is not easy to insert the second propulsion jack (200), so air pressure capable of overcoming earth pressure is provided to prevent the deformation of the casing (100).

[0049] In particular, the fifth step of the present invention is characterized in that the hydraulic cylinder (111) of the first propulsion jack (110) is accommodated inside the casing (100) and moves forward together with the casing (100), thereby maximizing the use of the space of the work area (P) and allowing a long casing (100) to be buried underground in a single operation.

[0050] The sixth step (S600) of the present invention is a step of separating the first propulsion jack (110) from the casing (100) after the insertion of the casing (100) is completed. When the hydraulic cylinder (111) of the first propulsion jack (110) is separated from the casing (100), the compressed air filled inside is naturally discharged, and only the casing (100) is buried so as to accommodate the second propulsion jack (200) on the outside of the work opening (P). (Fig. 4)

[0051] The seventh step (S700) of the present invention is the final step of inserting a second propulsion jack (200) into the interior of the casing (100) embedded in the ground through the preceding steps, and installing a reaction wall (170) integrally with the rear end of the casing (100) on the inner wall of the working opening (P) opposite the excavation hole into which the propulsion pipe (300) is advanced and inserted, and installing a pressure plate (213) that propels the propulsion pipe on the propulsion rod (212) of the second propulsion jack (200).

[0052] Here, the second propulsion jack (200) is installed in the opposite direction to the first propulsion jack (110) that inserts the casing (100) into the ground, and the propulsion pipe (300) is advanced through the pressure plate (213) by the advancement of the propulsion rod (212) to construct the excavation track.

[0053] The present invention is an excellent invention in that it allows a long casing (100) to be inserted into the ground by simultaneously advancing a first propulsion jack (110) that is inserted into the casing (100) while it is inserted inside the casing (100), thereby reducing the space occupied by the propulsion jack in the work area (P) and allowing a long casing (100) to be inserted into the ground in a single operation, which is a significant advantage over conventional methods of inserting a small-sized casing (100) by welding it together in one or more operations, and in that it prevents the casing (100) from being deformed by soil pressure due to air pressure during the insertion process of the casing (100).

[0054] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above but is defined by the claims, and it is obvious that various modifications and improvements can be made in the technical field to which the present invention belongs. Explanation of the symbols

[0055] 100 : Casing 110 : First thrust jack 111 : Hydraulic cylinder 112: Flange 113: Gasket 114: Propulsion rod 150 : Air injection pipe 160 : Reaction wall 170 : Reaction wall P : Work area P1 : Steel pipe 200 : 2nd thrust jack 210: Hydraulic cylinder 211: Flange 212: Propulsion rod 213 : Pressing plate

Claims

Claim 1 A first step of preparing a casing (100) having a diameter and length into which a propulsion jack capable of performing excavation work can be inserted, and a first propulsion jack (110) for inserting the casing (100); (S100) a second step of inserting a hydraulic cylinder (111) of the first propulsion jack (110) into the interior of the casing (100), wherein the rear flange (112) is tightly sealed to the rear end of the casing (100) through a gasket (113) to maintain airtightness; (S200) a third step of installing an air injection pipe (150) to inject compressed air into the interior of the casing (100) into which the hydraulic cylinder (111) is inserted through the flange (112) of the hydraulic cylinder (111); (S300) Step 4, installing a reaction wall on the inner side of the work opening (P) opposite where the casing (100) is to be embedded, and fixing the propulsion rod (114) of the first propulsion jack (110) to it so that the casing (100) with the hydraulic cylinder (111) inserted therein is horizontally installed so as to be aligned with the outer point of the work opening (P) to be embedded; (S400) Step 5, operating the first propulsion jack (110) to advance the hydraulic cylinder (111) using the reaction force of the propulsion rod (114) fixed to the reaction wall, and inserting the casing (100) horizontally into the ground and burying it while penetrating the steel pipe (P1) of the work opening (P); (S500) Step 6, in which, when the insertion of the casing (100) is completed, the hydraulic cylinder (111) of the first propulsion jack (110) is retracted to release the vacuum inside the casing (100) and the first propulsion jack (110) is separated from the casing (100); (S600) Step 7, in which, when the first propulsion jack (110) is separated, a reaction wall fixed to the rear end of the casing (100) is installed on the inner wall of the work opening (P) opposite the excavation hole, and the hydraulic cylinder (210) of the second propulsion jack (200) to propel the propulsion pipe (300) is inserted into the casing (100) so that the flange (211) is supported by the reaction wall, and a pressure plate (213) for propulsing the propulsion pipe (300) is installed on the propulsion rod (212).A method for installing a casing of a propulsion jack that expands the working space of a semi-shield method, characterized by including (S700), and further including a 5-1 step (S500-1) in which compressed air from a compressor is injected into the interior of the casing (100) through an air injection pipe (150) penetrating the flange (112) of the hydraulic cylinder (111) of the first propulsion jack (110) to maintain air pressure in the 5th step.; Claim 2 delete

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