Steel pipe movement mechanism and tunnel reinforcement method

Abstract

To easily move and mount a heavy steel pipe on a guide cell when joining steel pipes and driving a long steel pipe into the natural ground.SOLUTION: A steel pipe movement mechanism 1 comprises an inclined placement portion 21 formed to be inclined obliquely downward from an upper end portion 211 toward a lower end portion 212 and having a stopper provided at the lower end portion 212 for restricting movement of a steel pipe 10 placed and accommodated, a standby placement portion 22 arranged above the inclined placement portion 221 and having one end portion 221 projecting laterally beyond the upper end portion 211 of the inclined placement portion 21, and formed horizontally or inclined in a direction opposite to an inclination direction of the inclined placement portion 21 from the other end portion 222 to the one end portion 221, and a lifter 3 having an elevating placement portion 31 that moves up and down and arranged on the lower end portion side of the inclination direction of the inclined placement portion 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a steel pipe moving mechanism and a tunnel reinforcement method used in reinforcement work to reinforce the ground in front of a tunnel face during tunnel excavation. [Background technology]

[0002] Conventionally, in tunnel excavation work, auxiliary construction methods have been used before excavation work in front of the face, such as long-length pre-supporting work, in which a long steel pipe made by joining multiple steel pipes together to make a long length is driven diagonally upward from the front or outer periphery of the ground, and soil improvement material is injected through the driven long steel pipe to improve the ground, and long-length mirror reinforcement work, in which a long steel pipe made by joining multiple steel pipes to make a long length is driven from the face forward of the ground, and soil improvement material is injected through the driven long steel pipe to improve the ground.

[0003] When performing long-length forepiling or long-length head reinforcement work, steel pipes each about 3m long are used, and a drilling rod is inserted into this steel pipe, and multiple steel pipes and drilling rods are connected in series with a screw connection, allowing drilling into the ground and driving of the long steel pipes to be carried out simultaneously.When connecting these steel pipes, the steel pipes are brought in near the face in advance (see Figure 1 in Patent Document 1), and the steel pipes placed near the face are then loaded onto the guide cell of the drill jumbo. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-45637 A Summary of the Invention [Problem to be solved by the invention]

[0005] By the way, the specifications of one steel pipe for long-length pre-support construction, which is generally called the AGF method, are length: 3m, diameter: 114.3mm, thickness: 6mm, and the weight of each steel pipe is about 50kg. Therefore, moving heavy steel pipes by hand and loading them onto the guide cell is a very labor-intensive task, and there was a demand for a labor-saving method for this task.

[0006] The present invention has been proposed in consideration of the above-mentioned problems, and aims to provide a steel pipe moving mechanism and a tunnel reinforcement method using a steel pipe moving mechanism that can easily move and load heavy steel pipes onto a guide cell when joining steel pipes and driving long steel pipes into the ground. [Means for solving the problem]

[0007] The steel pipe moving mechanism of the present invention comprises an inclined mounting section which is formed with a diagonal downward incline from the upper end to the lower end and has a stopper at the lower end to regulate the movement of the steel pipe placed thereon; a waiting mounting section which is disposed above the inclined mounting section and has one end which is disposed so as to protrude laterally from the upper end of the inclined mounting section and is formed horizontally from the other end to the one end or with an incline in the opposite direction to the inclination direction of the inclined mounting section; and a lifting mounting section which rises and falls and is disposed on the lower end side of the inclined mounting section in the inclination direction, and is characterized in that the steel pipe placed and stored on the inclined mounting section is released from the regulation of the stopper and moved onto the lifting mounting section, the lifting mounting section is raised to move the steel pipe from the lifting mounting section to the other end of the waiting mounting section and place it thereon, and the steel pipe is moved on the waiting mounting section to one end of the waiting mounting section and dropped onto a guide cell. According to this, the steel pipe to be driven into the natural ground can be transported to the site while being accommodated in the inclined placement section, and the labor required for the work of transporting the steel pipe to the site and arranging the steel pipe in a position where it is easy to use can be reduced. In addition, the steel pipe accommodated in the inclined placement section can be moved to the waiting placement section, and then moved from the waiting placement section onto the guide cell and loaded onto the guide cell. In other words, the work of manually lifting the steel pipe and loading it onto the guide cell is no longer necessary, and when connecting steel pipes to drive a long steel pipe into the natural ground, the heavy steel pipe can be easily moved onto the guide cell and loaded onto it. In addition, by arranging the waiting placement section above the inclined placement section, the height of the waiting placement section can be made higher than the guide cell, which cannot be lowered below a certain height due to the structure of the drill jumbo, and the reliability of the work of moving the steel pipe from the waiting placement section onto the guide cell and loading it can be increased.

[0008] The steel pipe moving mechanism of the present invention is characterized in that by releasing the restriction of the stopper, the steel pipe placed and stored in the inclined supporting section is released from the restriction of the stopper and moved by rolling it onto the lifting and lowering supporting section. According to this, by releasing the restriction of the stopper and freeing the steel pipe from the restriction of the stopper, the steel pipe placed and stored on the inclined loading section can be moved onto the lifting loading section by utilizing the force of gravity, thereby saving the external energy required to move the steel pipe.

[0009] The steel pipe moving mechanism of the present invention is characterized in that the steel pipe placed and stored on the inclined supporting section is lifted from below by an arm that constitutes the lifting and lowering supporting section, and the lifting and lowering supporting section is retracted away from the inclined supporting section, thereby releasing the steel pipe from the restriction of the stopper and moving it onto the lifting and lowering supporting section. According to this, the steel pipe can be placed on the lifting and lowering platform by operating only the lifter without the need to release the restriction of the stopper on the inclined platform side, improving the operability of the steel pipe moving mechanism and the workability of moving the steel pipe. Also, the stopper at the lower end of the inclined platform can be simplified to a simple protrusion, etc., and the simplified structure of the stopper can reduce manufacturing costs.

[0010] The steel pipe moving mechanism of the present invention is characterized in that it is provided with a front-rear drive unit which moves the lifting and lowering platform unit forward and backward, and the lifting and lowering platform unit and the front-rear drive unit are raised and lowered together. This allows the steel pipe to be moved from the inclined loading section to the lifting loading section, and from the lifting loading section to the waiting loading section, without moving the lifter itself back and forth, further improving the workability of moving the steel pipe.

[0011] The steel pipe moving mechanism of the present invention is characterized in that it is capable of storing and loading a plurality of steel pipes side-by-side along the inclination of the inclined loading section. According to this, the number of steel pipes required for the configuration of the long steel pipe to be driven into the natural ground can be arranged and stored in the inclined loading section, and the required number of steel pipes can be moved smoothly and sequentially onto the guide cell and supplied when driving the long steel pipe. In addition, the required number of steel pipes can be loaded onto a truck while stored in the inclined loading section and transported to the site, which further reduces the labor required for transporting the steel pipes to the site and arranging them in positions where they can be easily used.

[0012] The steel pipe moving mechanism of the present invention is characterized in that the inclined placement portion is provided in multiple stages spaced apart vertically. According to this, the number of steel pipes required for driving into the natural ground can be arranged and stored in the multiple-stage inclined loading section, and the required number of steel pipes can be moved smoothly and sequentially onto the guide cell and supplied even in the limited steel pipe storage space near the face. In addition, the required number of steel pipes can be transported to the site in a state where they are stored in the multiple-stage inclined loading section, which further reduces the labor required for transporting the steel pipes to the site and arranging the steel pipes in positions where they can be easily used.

[0013] The steel pipe moving mechanism of the present invention is characterized in that the leading steel pipe, intermediate steel pipe and end steel pipe constituting the long steel pipe for ground reinforcement are placed and stored by type on the inclined placement sections of different levels. According to this, by storing the leading steel pipe, intermediate steel pipe and terminal steel pipe by type in inclined loading sections on different levels, it is possible to prevent errors in the type of steel pipe to be loaded onto the guide cell and cast, and construction management can be performed more accurately by casting the leading steel pipe, intermediate steel pipe and terminal steel pipe in sequence.

[0014] The steel pipe moving mechanism of the present invention is characterized in that the protruding width of the lifting placement section towards the inclined placement section is made smaller than the width of two steel pipes arranged side by side in close proximity. According to this, by making the protruding width of the lifting and lowering loading section toward the inclined loading section smaller than the width of two steel pipes arranged side by side in close proximity, the installation width and installation space for the lifter and steel pipe moving mechanism can be reduced, making it possible, for example, to reduce the width of the tunnel space.

[0015] The steel pipe moving mechanism of the present invention is characterized in that each of the pillars supporting the waiting and placing section is provided with a height adjustment section that can freely adjust the supporting height of the waiting and placing section. According to this, although the location where the steel pipe moving mechanism is to be installed near the tunnel face during excavation is not arranged in a neat surface, by adjusting the support height of the standby placement part supported by each support pillar via the height adjustment part, the standby placement part can be stably maintained horizontally or at an inclination opposite to the inclination direction of the inclined placement part, and the steel pipe moving mechanism can be stably installed. Also, for example, when the height of the standby placement part is insufficient to move the steel pipe from the standby placement part onto the guide cell and install it, or when the height of the standby placement part is too high and it becomes difficult to accurately drop the steel pipe at the specified position on the guide cell, the height of the standby placement part can be freely adjusted by the height adjustment part to match the height of the guide cell.

[0016] The tunnel reinforcement method of the present invention is a tunnel reinforcement method using the steel pipe moving mechanism of the present invention, and is characterized by comprising a first step of digging a pedestal around the face of the tunnel space, the upper surface of which is higher than the lower surface of the tunnel space, and placing the steel pipe moving mechanism with a steel pipe housed in the pedestal; a second step of dropping the steel pipe using the steel pipe moving mechanism onto a guide cell of a drill jumbo, loading the steel pipe onto the guide cell, and driving a long steel pipe into the ground by repeatedly loading and connecting the steel pipe; and a third step of digging out and removing the pedestal after the long steel pipe has been driven into the ground and proceeding with tunnel excavation. According to this, by placing the steel pipe moving mechanism containing the steel pipe on the remaining pedestal, the drill jumbo is positioned lower than the pedestal, and the height of the guide cell can be reliably lowered relative to the standby placement part of the steel pipe moving mechanism, and the work of moving the steel pipe from the standby placement part to above the guide cell and loading it can be performed more reliably. Also, by forming the pedestal from the remaining excavated natural ground and digging it out after pouring the long steel pipe, the height of the standby placement part of the steel pipe moving mechanism can be adjusted without increasing the labor required to excavate the natural ground, and further, since the natural ground is effectively used as the pedestal and a separate pedestal is not required, construction costs can be reduced. Effect of the Invention

[0017] According to the present invention, when joining steel pipes to drive a long steel pipe into the natural ground, the heavy steel pipes can be easily moved and loaded onto the guide cell. [Brief description of the drawings]

[0018] [Figure 1] 1 is a perspective view of a steel pipe moving mechanism and a guide cell on which a steel pipe is loaded by the steel pipe moving mechanism according to a first embodiment of the present invention; [Diagram 2] 5(a) to 5(c) are explanatory views illustrating the movement of a steel pipe by the steel pipe moving mechanism of the first embodiment and the loading of the steel pipe into a guide cell. [Diagram 3] FIG. 2 is a perspective explanatory view illustrating driving a steel pipe mounted on a guide cell into the natural ground by the steel pipe moving mechanism of the first embodiment. [Figure 4]1A is a plan view of the tunnel space in which the steel pipe moving mechanism and drill jumbo of the first embodiment are arranged, and FIG. 1B is an oblique explanatory view illustrating the base of the tunnel space on which the steel pipe moving mechanism of the embodiment is installed. [Diagram 5] 5A and 5B are explanatory diagrams illustrating a long-length pre-supporting work and a mirror reinforcement work into which a steel pipe is driven using the steel pipe moving mechanism of the first embodiment. [Figure 6] FIG. 6 is an explanatory diagram for explaining a steel pipe moving mechanism according to a second embodiment of the present invention. [Figure 7] 13(a) to 13(f) are explanatory views illustrating the operation of a lifting and lowering placement unit in a steel-pipe moving mechanism according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] [Steel pipe moving mechanism of the first embodiment] A steel pipe moving mechanism 1 according to a first embodiment of the present invention is used, for example, when performing auxiliary construction methods such as long pipe pre-supporting and mirror reinforcement in tunnel excavation work, and as shown in Figures 1 and 2, is composed of a steel pipe rack 2 having an inclined placement section 21 and a standby placement section 22 arranged above the inclined placement section 21, and a lifter 3 having a lifting and lowering placement section 31. The steel pipe rack 2 in the illustrated example has a frame structure.

[0020] The inclined placement portion 21 of the steel pipe rack 2 is formed to be inclined obliquely downward from the upper end portion 211 to the lower end portion 212, and in this example, the inclined placement portion 21 is constituted by arranging a plurality of bars in parallel at intervals in the pipe axis direction of the steel pipes 10. Moreover, the inclined placement portion 21 in this embodiment is provided in a plurality of stages at intervals in the vertical direction, and in the illustrated example, three stages of inclined placement portions 21, 21, 21 are provided. In Fig. 2, the upper ends 211, 211, 211 of the inclined placement portions 21, 21, 21 are arranged so that their horizontal positions are aligned at approximately the same position, and the lower ends 212, 212, 212 of the inclined placement portions 21, 21, 21 are also arranged so that their horizontal positions are aligned at approximately the same position.

[0021] Each inclined placement section 21 is capable of placing and housing a plurality of steel pipes 10 side by side along the inclination. A stopper that restricts the movement of the placed and housed steel pipes 10 is provided at the lower end 212 of each inclined placement section 21, and in the first embodiment, a releasable first stopper 213 is provided at the lower end 212 to prevent the steel pipes 10 placed and housed on the inclined placement section 21 from moving so as to fall from the lower end 212. The first stopper 213 is switchable between a state in which the movement of the steel pipes 10 is restricted and a release state in which the steel pipes 10 are allowed to move outward from the lower end 212 by operating an operating rod 214.

[0022] In the example of Figs. 1 and 2 of the first embodiment, the standby placement section 22 of the steel pipe rack 2 is formed horizontally from one end 221 located on the upper end 211 side of the inclined placement section 21 to the other end 222 located on the lower end 212 side, and is located above all of the multiple stages of inclined placement sections 21, and is located at the top stage of the steel pipe rack 2. It is also preferable that the standby placement section 22 is provided so as to be inclined in the opposite direction to the inclination direction of the inclined placement section 21. One end 221 of the standby placement section 22 is arranged so as to protrude laterally from the upper end 211 of the inclined placement section 21, and the other end 222 is arranged almost directly above the lower end 212 of the inclined placement section 21. In this example, the standby placement section 22 is configured by arranging a plurality of bars in parallel at intervals in the pipe axis direction of the steel pipe 10.

[0023] The standby placement section 22 is capable of moving the steel pipe 10 placed on its substantially horizontal upper surface in a rolling manner. One end 221 of the standby placement section 22 is provided with a releasable second stopper 223 that restricts the movement of the steel pipe 10, and prevents the steel pipe 10 placed on the standby placement section 22 and moved toward the one end 221 from moving so as to fall from the one end 221. The second stopper 223 is capable of switching between a state in which the movement of the steel pipe 10 is restricted and a released state in which the steel pipe 10 is allowed to move outward from the one end 221 by operating an operating rod 224.

[0024] The inclined placement section 21 and the standby placement section 22 are supported by pillars 23. In this example, a plurality of beams 24 are provided between the pillars 23, and the rods constituting the inclined placement section 21 and the standby placement section 22 are placed and installed on the beams 24, and each rod is joined to the beams 24, so that the inclined placement section 21 and the standby placement section 22, which are made up of a plurality of rods, are supported by the pillars 23 via the beams 24.

[0025] Each support pillar 23 is provided with a height adjustment unit 231 that can freely adjust the support height of the standby placement unit 22, and the height adjustment unit 231 in this embodiment is capable of adjusting both the height and inclination of the standby placement unit 22 and the height and inclination of the multiple-stage inclined placement unit 21. The height adjustment unit 231 in the illustrated example is composed of a height adjustment screw provided near the base of each support pillar 23.

[0026] The lifter 3 is disposed on the lower end 212 side in the inclined direction of the inclined placement section 21, and is disposed on the other end 222 side of the waiting placement section 22, with the lifting placement section 31 facing the steel pipe rack 2. The lifting placement section 31 of the lifter 3 is composed of a pair of arm-shaped members, and is raised and lowered by operation of the lifting operation section 32 by a lifting section 33 such as a pinion and rack lifting operation mechanism that is operated manually or electrically, for example.

[0027] In the first embodiment, the protruding width W of the lifting and lowering loading section 31 toward the inclined loading section 21 or the protruding width W toward the waiting loading section 22 is set to be larger than the width of multiple steel pipes 10 arranged side by side in a close proximity arrangement, and the protruding width W in the illustrated example is set to be approximately the same as the overall width of four steel pipes 10 arranged side by side in a close proximity arrangement.

[0028] When the steel pipe 10 placed and accommodated on the inclined placement section 21 is moved by the steel pipe moving mechanism 1 of the first embodiment and loaded into the guide cell 51 of the drill jumbo 5, as shown in Fig. 2(a), the tip of the lifting placement section 31 of the lifter 3 is placed near the lower end 212 of one of the inclined placement sections 21 on which the steel pipe 10 is placed among the multiple inclined placement sections 21, the operation rod 214 corresponding to this inclined placement section 21 is operated to release the first stopper 213, the steel pipe 10 is rolled from this inclined placement section 21 onto the lifting placement section 31, and the steel pipe 10 is placed on the lifting placement section 31. In the illustrated example, four steel pipes 10 are moved from the lowest inclined placement section 21 on which eight steel pipes 10 are placed to the lifting placement section 31 and placed thereon. Furthermore, if steel pipes 10 remain loaded and stored in the inclined loading section 21 after the required number of steel pipes 10 have been moved to the lifting and lowering loading section 31, the first stopper 213 is switched from the released state to the movement restricted state after the required number of steel pipes 10 have been moved to the lifting and lowering loading section 31.

[0029] 2(b), the lifting operation part 32 of the lifter 3 is operated to raise the lifting placement part 31 on which the steel pipe 10 is placed, the tip of the lifting placement part 31 is positioned near the other end 222 of the waiting placement part 22, and the steel pipe 10 is moved from the lifting placement part 31 to the other end 222 of the waiting placement part 22 by rolling and placed thereon. Furthermore, as shown in FIG. 2(c), the steel pipe 10 is moved to one end 221 of the waiting placement part 22 by rolling on the waiting placement part 22, the operating rod 224 is operated to release the second stopper 223, and the steel pipe 10 is dropped onto the guide cell 51 arranged in alignment with the one end 221 of the waiting placement part 22, and the steel pipe 10 is loaded onto the guide cell 51 by being supported by the steel pipe support part 52.

[0030] A rock drill 53 is provided in the guide cell 51 so as to be able to move forward and backward, and a connecting part 54 for a drilling rod (not shown) is provided at the tip of the rock drill 53. A drilling rod is inserted into the steel pipe 10 mounted on the guide cell 51, and the base end of the inserted drilling rod is connected to the connecting part 54, and the front end of the drilling rod is fitted into the front end of the steel pipe 10. The steel pipe 10 mounted on the guide cell 51 is drawn into the natural ground 100 from, for example, the face 101 and driven in accordance with the drilling of a drill bit at the tip of the drilling rod and the progress of the drilling rod (see FIG. 3).

[0031] After the preceding steel pipe 10 is driven into the natural ground 100 with its rear end exposed, the next steel pipe 10a is loaded onto the guide cell 51 by the movement action of the steel pipe moving mechanism 1 in the same manner as above, and the front end of the steel pipe 10a is connected to the rear end of the steel pipe 10 already driven into the natural ground 100, and a drilling rod (not shown) is connected to the rear end of the drilling rod already driven into the natural ground 100, thereby driving the steel pipes 10, 10a into the natural ground 100. This process is repeated to drive, for example, a long steel pipe 10L consisting of a leading steel pipe, an intermediate steel pipe, and an end steel pipe into the natural ground 100 (see FIG. 5(a)).

[0032] In the tunnel reinforcement method using the steel pipe moving mechanism 1 of the first embodiment, it is preferable to use a pedestal 4 as shown in Figures 4 and 5. In the reinforcement method using the pedestal 4, a pedestal 4 whose upper surface is higher than the lower surface of the tunnel space T is formed around the face 100 of the tunnel space T so as to leave the natural ground 100 unexcavated, and a steel pipe moving mechanism 1 consisting of a steel pipe rack 2 in which steel pipes 10 are accommodated and a lifter 3 is placed on the pedestal 4. In the example of Figure 4, a drill jumbo 5 arranged on the underside of the tunnel space T, which is lower than the upper surface of the pedestal 4, has a pair of two booms 55, 55 on the left and right, a guide cell 51 is provided at the tip of each boom 55, and pedestals 4, 4 are formed at the left and right positions of the tunnel space T corresponding to each guide cell 51, 51.

[0033] 4(a) denotes a truck that transports the steel pipe rack 2 on which the steel pipes 10 constituting the steel pipe moving mechanism 1 are pre-loaded and stored to the site, and it is preferable that the steel pipe rack 2 transported to the site by the truck 6 is pre-loaded with steel pipes 10. It is also preferable to use the steel pipe rack 2 fully loaded with steel pipes 10 as a unit for shipping from the factory, moving from the factory to the site, and moving and installing at the site, because this makes the flow from supply of the steel pipes 10 to construction smoother.

[0034] After the steel pipe moving mechanism 1 is placed on the pedestal 4, the steel pipe 10 stored on the steel pipe rack 2 is moved by the steel pipe moving mechanism 1, and the steel pipe 10 is dropped onto the guide cell 51 by the steel pipe moving mechanism 1, and the steel pipe 10 is loaded onto the guide cell 51. The steel pipe 10 loaded onto the guide cell 51 is driven into the natural ground 100 as described above, and the loading of the steel pipe 10 and the connection of the steel pipe 10 are repeated to drive the long steel pipe 10L into the natural ground 100. After completing the driving of the long steel pipe 10L into the natural ground 100 in the already formed tunnel space T, the pedestal 4 is excavated and removed to proceed with tunnel excavation.

[0035] A tunnel reinforcement method using a steel pipe moving mechanism 1, such as a tunnel reinforcement method using a pedestal 4, is used, for example, when constructing a long pre-supporting work 201 and a mirror reinforcement work 202 shown in Fig. 5 in a tunnel space T. Reference numeral 203 in Fig. 5 denotes a consolidated region formed by injecting a consolidated material in the long pre-supporting work 201.

[0036] When performing long-length pre-support work 201 or mirror reinforcement work 202 using a base 4, this is done approximately every 10 m of tunnel excavation, so after the planned steel pipe 10 is cast and the consolidating material is injected, the base 4 is excavated and removed as the tunnel space T is excavated to the next construction position, and a new base 4 is left excavated, and this process is repeated.

[0037] According to the steel pipe moving mechanism 1 of the first embodiment, the steel pipe 10 to be driven into the natural ground 100 can be transported to the site while being accommodated in the inclined placement section 21, and the labor required for the work of transporting the steel pipe 10 to the site and arranging the steel pipe 10 in a position where it is easy to use can be reduced. In addition, the steel pipe 10 accommodated in the inclined placement section 21 can be moved to the standby placement section 22, and then moved from the standby placement section 22 onto the guide cell 51 and loaded onto the guide cell 51. That is, the work of lifting the steel pipe 10 by hand and loading it onto the guide cell 51 is no longer necessary, and when driving the long steel pipe 10L into the natural ground by joining the steel pipes 10, the heavy steel pipe 10 can be easily moved onto the guide cell 51 and loaded onto it.

[0038] In addition, by arranging the standby placement section 22 above the inclined placement section 21, the standby placement section 22 can be set higher than the guide cell 51 attached to the boom 55 of the drill jumbo 5, which cannot be lowered below a certain height due to the structure of the drill jumbo, and the reliability of the work of moving and mounting the steel pipe 10 from the standby placement section 22 onto the guide cell 51 can be improved. In particular, in the steel pipe moving mechanism 1 of this embodiment, the standby placement section 22 is provided at the top stage, so that the reliability of this work can be further improved. In addition, when the steel pipe 10 placed and accommodated on the inclined placement section 21 is moved onto the lifting placement section 31, the restriction of the first stopper 213, which is a stopper provided at the lower end 212 of the inclined placement section 21, is released and the steel pipe 10 is released from the restriction of the first stopper 213, so that the steel pipe 10 placed and accommodated on the inclined placement section 21 can be moved onto the lifting placement section 31 by using gravity drop, and the external energy required for moving the steel pipe 10 can be saved. In addition, when moving the steel pipe 10 from the waiting placement section 22 onto the guide cell 51, the restriction of the second stopper 223 can be released and the steel pipe 10 can be moved, making it easy to move the steel pipe 10 and load it onto the guide cell 51.

[0039] Furthermore, by making it possible to store a plurality of steel pipes 10 side-by-side along the inclination of the inclined placement section 21, the number of steel pipes 10 required for the configuration of the long steel pipe 10L to be driven into the natural ground 100 can be arranged and stored in the inclined placement section 21, and when driving the long steel pipe 10L, the required number of steel pipes 10 can be moved smoothly and sequentially onto the guide cell 51 and supplied. Furthermore, with the required number of steel pipes 10 stored in the inclined placement section 21, the steel pipe moving mechanism 1 or the steel pipe rack 2 can be loaded onto a truck and transported to the site, thereby further reducing the labor required for transporting the steel pipes 10 to the site and arranging the steel pipes 10 in positions where they are easy to use.

[0040] Furthermore, by providing the inclined placement sections 21 in multiple stages spaced apart vertically, even if only a limited space for placing steel pipes on the pedestal 4 can be secured near the face, the number of steel pipes 10 required for driving into the natural ground 100 can be arranged and stored in the multiple stages of inclined placement sections 21, and the required number of steel pipes 10 can be moved smoothly and sequentially onto the guide cells 51 for supply. Furthermore, the steel pipe moving mechanism 1 or the steel pipe rack 2 can be brought into the site with the required number of steel pipes 10 stored in the multiple stages of inclined placement sections 21, and the labor required for the work of bringing the steel pipes 10 into the site and arranging the steel pipes 10 in positions where they are easy to use can be further reduced.

[0041] In addition, by setting the protruding width W of the lifting and lowering placement section 31 of the lifter 3 toward the inclined placement section 21 to be larger than the width of the multiple steel pipes 10 arranged side by side in close proximity, the number of times the lifting and lowering placement section 31 is raised and the steel pipes 10 are moved from the lifting and lowering placement section 31 to the waiting placement section 22 can be reduced, thereby reducing the labor required. For example, in the long-length pre-supporting work known as the AGF method, four steel pipes 10 consisting of a leading steel pipe, an intermediate steel pipe, an intermediate steel pipe, and an end steel pipe are typically connected and poured, so that the four pipes are lifted as a set to the waiting placement section 22, moved sequentially onto the guide cells 51, and poured while being connected, which can be efficiently performed.

[0042] Furthermore, by providing each of the supports 23 supporting the standby placement section 22 with a height adjustment section 231 capable of freely adjusting the support height of the standby placement section 22, even if the installation surface of the pedestal 4 formed near the tunnel face during excavation is not smooth, the standby placement section 22 can be stably maintained horizontally or tilted in the opposite direction to the tilt direction of the tilt placement section 21 by adjusting the support height of the standby placement section 22 supported by each of the supports 23 via the height adjustment section 231, and the steel pipe rack 2 of the steel pipe moving mechanism 1 can be stably installed. Furthermore, for example, when the height of the standby placement section 22 is insufficient to move the steel pipe 10 from the standby placement section 22 onto the guide cell 51 and mount it thereon, or when the height of the standby placement section 22 is too high and it becomes difficult to accurately drop the steel pipe 10 at a predetermined position on the guide cell 51, the height of the standby placement section 22 can be freely adjusted by the height adjustment section 231 to match the height of the guide cell 51.

[0043] According to the tunnel reinforcement method using the pedestal 4, the drill jumbo 5 is placed at a lower position than the pedestal 4 by placing the steel pipe moving mechanism 1 containing the steel pipe 10 on the remaining pedestal 4, and the height of the guide cell 51 relative to the standby placement section 22 of the steel pipe moving mechanism 1 can be reliably lowered, and the work of moving the steel pipe 10 from the standby placement section 22 to above the guide cell 51 and placing it can be more reliably performed. In addition, by forming the pedestal 4 from the remaining excavation of the natural ground 100 and digging it out after pouring the long steel pipe 10L, the height of the standby placement section 22 of the steel pipe moving mechanism 1 can be adjusted without increasing the labor required to excavate the natural ground 100, and further, since the natural ground 100 is effectively used as the pedestal 4 and a separate pedestal is not required, construction costs can be reduced.

[0044] [Steel pipe moving mechanism of the second embodiment] A steel pipe moving mechanism 1v of the second embodiment according to the present invention is a modified example of the first embodiment, and as shown in Figures 6 and 7, is composed of a steel pipe rack 2v having an inclined placement section 21v and a standby placement section 22v arranged above the inclined placement section 21v, and a lifter 3v having a lifting and lowering placement section 31v. The steel pipe rack 2v in the illustrated example also has a frame structure, and side plates shown by dashed lines in the figure are provided at both ends of the inclined placement section 21v and both ends of the standby placement section 22v in the pipe axial direction of the steel pipe 10 to be placed and accommodated, for preventing the steel pipe from falling.

[0045] The inclined placement portion 21v is also formed to be inclined obliquely downward from the upper end portion 211v to the lower end portion 212v, and in this example, the inclined placement portion 21v is formed by arranging a plurality of bars in parallel at intervals in the pipe axis direction of the steel pipe 10. The inclined placement portion 21v is provided in a plurality of stages at intervals from top to bottom, and in the illustrated example, four stages of inclined placement portions 21v, 21v, 21v, 21v are provided. In the illustrated example, the leading steel pipe 10t is placed and accommodated in the inclined placement portion 21v in one stage such as the top stage, the intermediate steel pipes 10m and 10m are placed and accommodated in the inclined placement portion 21v in one stage such as the bottom stage, and the leading steel pipe 10e is placed and accommodated in each stage (eight pipes in the illustrated example), and the same type of steel pipes 10 are placed and accommodated by type in the inclined placement portion 21v in each stage. In FIG. 6, the upper ends 211v of the inclined placement portions 21v are arranged so as to be aligned at approximately the same position in the horizontal direction, and the lower ends 212v of the inclined placement portions 21v are also arranged so as to be aligned at approximately the same position in the horizontal direction.

[0046] Each inclined placement portion 21v is capable of placing and housing a plurality of steel pipes 10 side by side along its inclination, and a first stopper 213v is provided at its lower end 212v as a stopper for restricting movement of the placed and housed steel pipes 10. In the illustrated example, the first stopper 213v is a protrusion formed on the inclined placement portion 21v so as to protrude upward, and this protrusion prevents the steel pipes 10 placed and housed on the inclined placement portion 21v from moving and falling from the lower end 212v.

[0047] The standby placement section 22v of the steel pipe rack 2v is inclined downward from the other end 222v arranged on the lower end 212v side of the inclined placement section 21v to one end 221v arranged on the upper end 211v side of the inclined placement section 21v, in other words, downward toward the guide cell 11, and is formed in a tilted direction opposite to the tilt direction of the inclined placement section 21v. The standby placement section 22v is arranged above any of the multiple inclined placement sections 21v and is arranged on the top stage of the steel pipe rack 2v. One end 221v of the standby placement section 22v is arranged so as to protrude laterally from the upper end 211v of the inclined placement section 21v, and the other end 222v is arranged almost directly above the lower end 212v of the inclined placement section 21v. In this example, the standby placement section 22v is also configured by arranging a plurality of bars side by side at intervals in the pipe axis direction of the steel pipe 10.

[0048] The standby placement section 22v is capable of moving the steel pipe 10 placed on a placement surface inclined in the opposite direction to the inclination direction of the inclined placement section 21v so as to roll. The inclination angle of the placement surface of the standby placement section 22v inclined in the opposite direction to the inclined placement section 21v is preferably greater than 0 degrees and less than 10 degrees. A releasable second stopper 223v that restricts the movement of the steel pipe 10 is provided at one end 221v of the standby placement section 22v. The second stopper 223v has the same configuration as the second stopper 223 in the first embodiment, and the second stopper 223v prevents the steel pipe 10 placed on the standby placement section 22v and moved to the one end 221v side from unintentionally falling and moving from the one end 221v.

[0049] The inclined placement portion 21v and the standby placement portion 22v are supported by pillars 23v. A plurality of beams similar to the beam 24 in the first embodiment are installed between the pillars 23v, and the rods constituting the inclined placement portion 21v and the standby placement portion 22v are placed and installed on the plurality of beams, and the rods are joined to the beams to form the inclined placement portion 21v and the standby placement portion 22v, and the inclined placement portion 21v and the standby placement portion 22v are supported by the pillars 23v via the beams.

[0050] Each support column 23v is provided with a height adjustment section 231v that can freely adjust the support height of the standby placement section 22v, and the height adjustment section 231v in the second embodiment can also adjust both the height and inclination of the standby placement section 22v and the height and inclination of the multiple-stage inclined placement section 21v. The height adjustment section 231v in the illustrated example is also composed of a height adjustment screw provided near the base of each support column 23v.

[0051] The lifter 3v is disposed on the lower end 212v side of the inclined placement section 21v in the inclination direction, and is disposed on the other end 222v side of the standby placement section 22v, with the lifting placement section 31v facing the steel pipe rack 2v. The lifting placement section 31v of the lifter 3v is formed in an arc shape with an R along the outer periphery of the steel pipe 10, and is composed of a pair of arms capable of holding one steel pipe 10 so as to follow the outer periphery. The lifting placement section 31v advances toward the inclined placement section 21v and retreats away from the inclined placement section 21v by a front-rear drive section 34v that advances and retreats, such as a hydraulic piston mechanism.

[0052] The lifting and lowering placement unit 31v and the front-rear drive unit 34v, which moves the lifting and lowering placement unit 31v forward and backward, are raised and lowered by the lifting and lowering unit 33v, which is an elevation mechanism such as a zip chain or a pinion and a rack, and the lifting and lowering placement unit 31v and the front-rear drive unit 34v raise and lower the lifting and lowering unit 33v as a unit. The front-rear drive unit 34v and the lifting and lowering unit 33v are operated manually or electrically by operating a lifting and lowering operation unit (not shown). In addition, the steel pipe rack 2v and the lifter 3v are provided with attachment units 7v, such as engagement mechanisms, which detachably fix them to each other in order to fix the positions of both at the site.

[0053] When the steel pipe 10 placed and accommodated on the inclined placement section 21v is moved by the steel pipe moving mechanism 1v of the second embodiment and loaded into the guide cell 51 of the drill jumbo 5, the lifting placement section 31v consisting of a pair of arms of the lifter 3v is placed near the lower end 212v of one of the inclined placement sections 21v on which the steel pipe 10 is placed among the multiple inclined placement sections 21v (see FIG. 7(a)). Then, at a position where it does not interfere with the bar material on the inclined placement section 21v, the lifting placement section 31v is advanced so as to approach the inclined placement section 21v by the operation of the front-rear drive section 34v, and the steel pipe 10 placed and accommodated on the inclined placement section 21v is lifted from below by the arm of the lifting placement section 31v (see FIGS. 7(b) and (c)). As a result, the steel pipe 10 is released from the restriction of the first stopper 213v such as a protrusion and moves onto the lifting placement section 31v.

[0054] Next, the front-rear drive unit 34v operates to move the lifting and lowering loading section 31v back away from the inclined loading section 21v (see Figures 7(c) and (d)), and the lifting and lowering section 31v on which the steel pipe 10 is placed is raised by the lifting and lowering section 33v of the lifter 3 (see Figure 7(e)).The tip of the lifting and lowering loading section 31v is positioned near the other end 222v of the waiting loading section 22v, and the front-rear drive unit 34v operates to move the lifting and lowering loading section 31v forward so as to approach the waiting loading section 22v at a position that does not interfere with the bar material in the waiting loading section 22v, and the steel pipe 10 is moved in a rolling manner from the lifting and lowering loading section 31v to the other end 222v of the waiting loading section 22v and placed thereon (see Figure 7(f)).

[0055] The steel pipe 10 placed on the other end 222v of the waiting placement section 22v, which is inclined downward toward the guide cell 11, naturally rolls toward one end 221v of the waiting placement section 22v or rolls with the assistance of human power, and moves to one end 221v. Then, as in the first embodiment, the second stopper 223v is released, and the steel pipe 10 is dropped onto the guide cell 51 and loaded (see FIG. 2). Since it takes a certain amount of time to cast the steel pipe 10, even if the next steel pipe 10 is raised and moved one by one while the previous steel pipe 10 is being cast, it is usually possible to move the next steel pipe 10 to one end 221v of the waiting placement section 22v before the casting of the previous steel pipe 10 is completed.

[0056] The subsequent casting of the steel pipe 10 loaded on the guide cell 51 is the same as in the first embodiment. Also, in the tunnel reinforcement method using the steel pipe moving mechanism 1v of the second embodiment, it is preferable to perform the tunnel reinforcement method using the pedestal 4 in the first embodiment, and it is preferable to perform the long-length pre-support work 201 and the mirror reinforcement work 202 using the pedestal 4.

[0057] According to the steel pipe moving mechanism 1v of the second embodiment, it is possible to obtain the corresponding effects from the configuration corresponding to the first embodiment. In addition, the steel pipe 10 can be placed on the lifting and lowering placement part 31v by operating only the lifter 3v side without the need for an operation to release the restriction of the first stopper 213v on the inclined placement part 21v side, improving the operability of the steel pipe moving mechanism 1v and the workability of moving the steel pipe. In addition, the first stopper 213v at the lower end part 212v of the inclined placement part 21v can be simplified to a mere protrusion, etc., and the simplified structure of the first stopper 213v can reduce the manufacturing cost.

[0058] In addition, by providing a front-rear drive unit 34v that moves the lifting placement unit 31v forward and backward, and by lifting and lowering the lifting placement unit 31v and the front-rear drive unit 34v together, the steel pipe 10 can be moved from the inclined placement unit 21v to the lifting placement unit 31v and from the lifting placement unit 31v to the waiting placement unit 22v without moving the lifter 3v itself forward and backward, and the workability of moving the steel pipe can be improved. In addition, by storing the leading steel pipe 10t, the intermediate steel pipe 10m, and the terminal steel pipe 10e in the inclined placement units 21v of different stages by type, it is possible to prevent errors in the type of steel pipe 10 to be placed on the guide cell 51 and cast, and to perform construction management of casting the leading steel pipe 10t, the intermediate steel pipe 10m, and the terminal steel pipe 10e in order more accurately.

[0059] [Scope of the invention disclosed herein] The invention disclosed in this specification includes, in addition to each invention, embodiment, and example listed as the invention, those specified by changing partial contents of these to other contents disclosed in this specification, or those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial action and effect can be obtained, and forming a higher-level concept. The invention disclosed in this specification also includes the following contents and further modified examples described below.

[0060] For example, in the first embodiment, the protruding width W of the lifting and lowering mounting section 31 of the lifter 3 in the steel pipe moving mechanism 1 toward the inclined mounting section 21 is also suitable for being set smaller than the width of two steel pipes 10·10 arranged side by side in close proximity to each other, thereby making it possible to reduce the installation width and installation space of the lifter 3 and steel pipe moving mechanism 1, making it possible to apply the mechanism to, for example, a tunnel space T having a narrower width.

[0061] In addition, in the above embodiment, a long-length pre-receiving work 201 and a mirror reinforcement work 202 were used as examples of a tunnel reinforcement method using a steel pipe moving mechanism 1, but the tunnel reinforcement method using the steel pipe moving mechanism of the present invention may be used as appropriate within the applicable range, and may also be applied, for example, when driving foot piles or side piles of a tunnel. [Industrial Applicability]

[0062] The present invention can be used when driving long steel pipes into the ground for reinforcement in tunnel excavation work. [Explanation of symbols]

[0063] 1, 1v...steel pipe moving mechanism 2, 2v...steel pipe rack 21, 21v...inclined placement section 211, 211v...upper end 212, 212v...lower end 213, 213v...first stopper 214...operation rod 22, 22v...standby placement section 221, 221v...one end 222, 222v...other end 223, 223v...second stopper 224...operation rod 23, 23v...support 231, 231v...height adjustment section 24...beam 3, 3v...lifter 31, 31v...lift placement section 32...lift operation section 33, 33v...lift section 34v...front-rear drive section 4...base 5...drill jumbo 51...guide cell 52...steel pipe support section 53... Rock drill 54... Connection part 55... Boom 6... Truck 7v... Mounting part 10, 10a, 10t, 10m, 10e... Steel pipe 10L... Long steel pipe 100... Natural ground 101... Face 201... Long-length pre-support 202... Mirror reinforcement 203... Consolidation area W... Projection width of lifting and lowering loading part T... Tunnel space

Claims

1. An inclined placement section formed to be inclined obliquely downward from an upper end to a lower end, and having a stopper provided at the lower end for restricting movement of the steel pipe placed thereon; a standby placement section disposed above the inclined placement section, one end of which is disposed so as to protrude laterally beyond the upper end of the inclined placement section, and which is formed horizontally from the other end to the one end or inclined in a direction opposite to the inclination direction of the inclined placement section; a lifter having a lifting and lowering placement part that moves up and down and is disposed on a lower end side of the inclined placement part in a tilt direction; The steel pipe placed and accommodated on the inclined placement section is released from the restriction of the stopper and moved onto the lift placement section, The lifting and lowering placement section is raised to move the steel pipe from the lifting and lowering placement section to the other end of the waiting and placing section, A steel pipe moving mechanism characterized by moving the steel pipe above the waiting and placing section to one end of the waiting and placing section and dropping the steel pipe onto a guide cell.

2. A steel pipe moving mechanism as described in claim 1, characterized in that by releasing the restriction of the stopper, the steel pipe placed and stored in the inclined supporting section is released from the restriction of the stopper and moved by rolling onto the lifting and lowering supporting section.

3. A steel pipe moving mechanism as described in claim 1, characterized in that the steel pipe placed and stored on the inclined supporting section is lifted from below by an arm constituting the lifting and lowering supporting section, and the lifting and lowering supporting section is retracted away from the inclined supporting section, thereby releasing the steel pipe from the restriction of the stopper and moving it onto the lifting and lowering supporting section.

4. 4. The steel pipe moving mechanism according to claim 3, further comprising a front-rear drive section for moving the lifting and lowering platform section forward and backward, and the lifting and lowering platform section and the front-rear drive section are raised and lowered together.

5. A steel pipe moving mechanism as described in any one of claims 1 to 4, characterized in that a plurality of steel pipes can be placed and stored side-by-side along the inclination of the inclined placement section.

6. The steel pipe moving mechanism according to any one of claims 1 to 5, characterized in that the inclined placement portion is provided in a plurality of stages spaced apart vertically.

7. A steel pipe moving mechanism as described in claim 6, characterized in that the leading steel pipe, intermediate steel pipe and end steel pipe constituting the long steel pipe for ground reinforcement are placed and stored by type on the inclined placement sections of different levels.

8. A steel pipe moving mechanism as described in any one of claims 1 to 7, characterized in that the protruding width of the lifting and lowering loading section toward the inclined loading section is made smaller than the width of two steel pipes arranged side by side in close proximity.

9. A steel pipe moving mechanism as described in any one of claims 1 to 8, characterized in that each of the pillars supporting the waiting placement section is provided with a height adjustment section that can freely adjust the support height of the waiting placement section.

10. A tunnel reinforcement method using the steel pipe moving mechanism according to any one of claims 1 to 9, A first step of excavating a pedestal having an upper surface higher than a lower surface of the tunnel space around the face of the tunnel space, and placing the steel pipe moving mechanism with a steel pipe accommodated in the pedestal; A second step of dropping the steel pipe onto a guide cell of a drill jumbo by the steel pipe moving mechanism, loading the steel pipe onto the guide cell, and driving the long steel pipe into the natural ground by repeating the loading and connecting of the steel pipe; A tunnel reinforcement method comprising a third step of driving the long steel pipe into the ground, digging out the base, and proceeding with tunnel excavation.

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