Excavation equipment, stabilization devices, and underground continuous wall construction method

Abstract

We will implement an economical method for creating continuous underground walls that can connect elements with high precision. [Solution] An excavation device 100 for drilling holes in the ground comprises one or more cylindrical rods 110, a plurality of drilling blades 120 provided on the circumferential surface of the rods 110, an auger head 130 provided at the lower end of the rods 110, and a stabilizer 200 attached to the outermost rod 110. The stabilizer 200 has a fixed part 211 that is rotatably attached to a predetermined position on the rods 110, an extension part 212 that extends from the fixed part 211 toward the side of the excavation device 100, and a guide part 220 provided at the end of the extension part 212. The guide part 220 is fitted between a pair of flanges 310 of an H-shaped steel beam 300 and is configured to slide up and down along the web 320 of the H-shaped steel beam 300.

Description

Technical Field

[0004] , , , , , , ,

[0001] The present invention relates to an excavation device. Further, the present invention relates to a stabilizer that can be attached to the excavation device. Furthermore, the present invention relates to a method for constructing a diaphragm wall underground, which includes a step of embedding an H-shaped steel in an excavation hole in the ground using this excavation device.

Background Art

[0002] Conventionally, when constructing underground structures such as tunnel structures underground, a soil retaining wall is continuously constructed around them in advance to prevent the collapse of the soil wall around the construction site and the inflow of groundwater, while excavating the underground working space. As methods for constructing diaphragm walls, for example, the SMW (Soil Mixing Wall) method and the TRD (Trench cutting Re-mixing Deep wall) method are generally known. In these methods, the ground is excavated from the ground surface, and after inserting a plurality of core materials made of H-shaped steel or the like in parallel at intervals into the excavation hole, cement milk is poured into the excavation hole and solidified to construct a soil-cement soil retaining wall reaching from the ground surface to the impervious layer.

[0003] For example, Patent Document 1 discloses a conventional SMW method and the core materials used therein. In this SMW method, when constructing a continuous integral soil-cement diaphragm wall, a multi-axis kneading auger machine is used to completely wrap the drilling and kneading shaft at the element end around the next element to construct the soil-cement diaphragm wall. In Patent Document 1, the SMW method is said to be capable of constructing a wall body with excellent water stoppage performance because, for example, a 3-axis and 5-axis multi-axis auger is mounted on a base machine, and drilling and kneading are performed by completely wrapping the auger screws at both ends.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] By the way, in conventional construction methods such as the one disclosed in Patent Document 1, when creating a continuous wall using elements consisting of three boreholes, for example, the first and second elements are drilled with a gap between them, and then the third element is drilled so as to connect the first and second elements. At this time, it is necessary to completely overlap the borehole at the left end of the third element with the borehole at the right end of the first element, and to completely overlap the borehole at the right end of the third element with the borehole at the left end of the second element (see, for example, Figure 8 in Patent Document 1). However, although it is actually possible to form nine boreholes using the first to third elements, in conventional construction methods, because a portion of the boreholes of each element is completely overlapped, the limit is that only seven boreholes can be formed. For this reason, conventional construction methods have the problem that the number of drilling operations using a multi-axis auger increases, making them uneconomical.

[0006] On the other hand, a semi-lap method, in which excavation is carried out with a multi-axis auger while slightly offsetting the excavated holes of each element without completely overlapping them, is also technically feasible. However, this semi-lap method may cause lap cracks, where the excavated holes of each element do not connect. If such lap cracks occur, there is a risk of a serious defect occurring, such as water leakage into the retaining wall that has been solidified by pouring in cement grout. In addition, with this semi-lap method, the continuity of each element cannot be guaranteed, so the excavated holes may not be aligned in a straight line, and as a result there is a risk that the retaining wall will be formed in a curved shape.

[0007] Therefore, the main objective of the present invention is to realize an economical method for constructing a continuous underground wall that can connect elements with high precision. [Means for solving the problem]

[0008] The inventors of the present invention diligently considered means to solve the problems of the prior art described above, and as a result, decided to attach a stabilizing device to a drilling device for ground drilling, and to use this stabilizing device to lower the drilling device along an already buried H-shaped steel beam. This makes it possible to connect each element with precision without completely overlapping a part of the element formed underground by the drilling device with a part of another element, thus reducing the number of drilling operations compared to conventional methods and improving the economic efficiency of the underground continuous wall construction method. Based on the above findings, the inventors realized that the problems of the prior art could be solved and completed the present invention. Specifically, the present invention has the following configuration or process.

[0009] The first aspect of the present invention relates to a drilling device. The drilling device according to the present invention is rotationally driven by a drive device to drill holes in the ground. The drilling device comprises one or more cylindrical rods, a plurality of drilling blades provided on the circumferential surface of the rods, an auger head provided at the lower end of the rods, and a stabilizer attached to the outermost of the rods. When there is one rod, the stabilizer is attached to that rod. When there are three rods, the stabilizer is attached to the two outermost rods. The same applies when there are five rods. The stabilizer has a fixed part, an extension part, and a guide part. The fixed part is a part that is rotatably attached to a predetermined position on the rod. The extension part is a part that extends from the fixed part toward the side of the drilling device. The guide part is a part provided at the end of the extension part. This guide part is configured to fit between a pair of flanges of an H-beam and to slide up and down along the web of the H-beam. In this way, by attaching a stabilizing device to the rod of the drilling machine, it becomes possible to connect each element precisely to each other without having to completely overlap parts of the elements formed underground by the drilling machine with parts of other elements.

[0010] In the drilling apparatus according to the present invention, when the rod is single-axis, the stabilizer is preferably attached to the single-axis rod, and the extension portion extends from the fixed portion toward both sides of the drilling apparatus. Conventional diaphragm wall construction methods required the use of multi-axis drilling apparatuses such as three-axis or five-axis, but according to the present invention, the diaphragm wall construction method can be implemented even with a single-axis drilling apparatus.

[0011] In the drilling apparatus according to the present invention, when there are multiple rods, the stabilizer may be attached to the two outermost rods, and the extension may extend from the fixed part toward one side of the drilling apparatus. The present invention can also be applied to three-axis or five-axis drilling apparatuses, as in the prior art.

[0012] In the drilling device according to the present invention, the guide portion preferably includes a lower guide plate that extends downward from the tip of the extension portion. By providing a lower guide plate in the guide portion in this way, the drilling device can be stably lowered into the ground along the H-shaped steel.

[0013] In the drilling device according to the present invention, the guide section may further include an upper guide plate extending upward from the tip of the extension section. By providing an upper guide plate in addition to the lower guide plate in the guide section, the drilling device can be lowered into the ground more stably along the H-shaped steel.

[0014] A second aspect of the present invention relates to a stabilizing device. The stabilizing device according to the present invention is attachable to a drilling device that is rotationally driven by a drive device for drilling holes in the ground. The stabilizing device has a fixed portion that can be freely attached to a predetermined position on a cylindrical rod in the drilling device, an extension portion that extends from the fixed portion toward the side of the drilling device, and a guide portion provided at the end of the extension portion. The guide portion is configured to fit between a pair of flanges of an H-beam and to slide up and down along the web of the H-beam.

[0015] A third aspect of the present invention relates to a continuous underground wall construction method. In the continuous underground wall construction method according to the third aspect, the excavation device according to the first aspect described above is used. That is, in the continuous underground wall construction method according to the third aspect, a cement-based suspension is injected while forming an excavation hole in the ground using an excavator equipped with the excavation device according to the first aspect and a drive device that rotates the excavation device, and H-shaped steel is embedded in the excavation hole into which the suspension has been injected. Here, in the continuous underground wall construction method, first, elements including one or more excavation holes formed in a single excavation operation by the excavation device are formed at a predetermined gap between them (first excavation step). Next, H-shaped steel is embedded in the excavation hole of each element formed in this first excavation step (first embedding step). Next, after this first embedding step, elements are formed by the excavation device so as to connect adjacent elements formed in the first excavation step (second excavation step). In this second excavation step, the guide portion of the stabilizing device is fitted between a pair of flanges of H-shaped steel embedded in adjacent elements, and the excavation operation is performed using the excavation equipment. Next, H-shaped steel is embedded in the excavated holes of each element formed in the second excavation step (second embedding step). After this second embedding step, a retaining wall is formed by pouring cement grout into the continuous excavated holes and allowing it to solidify. [Effects of the Invention]

[0016] According to the present invention, a continuous underground wall construction method that can connect elements with high precision can be realized in an economical manner. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 schematically shows an example of the configuration of a single-axis drilling machine. [Figure 2] Figure 2 schematically shows examples of configurations for a 3-axis drilling machine and a 5-axis drilling machine. [Figure 3] Figure 3 shows each step of the underground diaphragm wall construction method using a single-axis drilling device. [Figure 4] Figure 4 shows each step of the underground diaphragm wall construction method using a three-axis drilling device. [Figure 5]FIG. 5 shows each step of the diaphragm wall method using a 5-axis excavation device. [Figure 6] FIG. 6 shows a configuration example of a stabilizer. [Figure 7] FIG. 7 shows an example of a spacer that can be attached to a stabilizer. [Figure 8] FIG. 8 schematically shows a modified example of a 1-axis excavation device. [Figure 9] FIG. 9 shows an embodiment in which a spacer is attached to only one side of a stabilizer to eccentrically position an excavation device. [Figure 10] FIG. 10 shows a modified example of a stabilizer further provided with an upper guide plate. MODE FOR CARRYING OUT THE INVENTION

[0018] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and also includes those appropriately modified by those skilled in the art within a self-evident range from the following embodiments. In the present specification, "A to B" means "A or more and B or less".

[0019] FIG. 1 shows the configuration of an excavation device 100 according to an embodiment of the present invention. As a premise, this excavation device 100 is used, for example, by being attached to a kneading auger machine as shown in FIG. 6 of Patent Document 1. The kneading auger machine includes a drive device including a hydraulic motor and a speed reducer, and the excavation device 100 is connected downward to this drive device. The excavation device 100 performs excavation from the ground surface into the ground by being rotationally driven by this drive device.

[0020] As shown in Figure 1, the drilling device 100 comprises a cylindrical rod 110, a plurality of drilling blades 120 provided on the outer surface of the rod 110, and an auger head 130 provided at the lower end of the rod 110. Drive control of the drive device of the mixing auger machine causes the rod 110 to rotate circumferentially around its central axis. As the rod 110 rotates, the auger head 130 provided at its lower end drills the ground surface in a conical manner, and a borehole is formed in the ground as the rod 110 descends. During drilling, the plurality of screw-blade-shaped drilling blades 120 provided on the outer surface of the rod 110 drill and agitate the soil in the borehole. Although not shown in the figure, the outer surface of the rod 110 may also be provided with a plurality of flat-blade-shaped agitation blades in addition to the screw-blade-shaped drilling blades 120. The rod 110 is a hollow shaft, and cement-based turbid liquids such as cement milk can be passed through its interior. The turbid liquid that has flowed through the rod 110 is discharged from the outlet of the auger head 130 and filled into the borehole. As the cement-based turbid liquid, known turbid liquids containing cement can be used, such as cement milk (a mixture of water and cement), mortar grout (a mixture of cement, water, and fine aggregate such as sand), or cement bentonite (a mixture of cement, water, and bentonite, a clay mineral).

[0021] As shown in Figure 1, the drilling device 100 is further equipped with a stabilizer 200. This stabilizer 200 is attached to the rod 110 and can also be attached to and detached. Figure 1 shows a front view of the stabilizer 200 attached to the rod 110, as well as a plan view of the stabilizer 200. This plan view shows the structure of the stabilizer 200, as well as the two H-shaped steel beams 300 on which the stabilizer 200 slides.

[0022] In this embodiment, the stabilizer 200 is mainly composed of a support member 210 and a guide member 220.

[0023] The support member 210 is a component for attaching the stabilizer 200 to the rod 110 of the drilling device 100. The support member 210 includes a fixed portion 211 that is rotatably attached to a predetermined position on the rod 110, and two extensions 212 that extend from the fixed portion 211 toward the left and right sides of the drilling device 100. Two collars 140 for attaching the support member 210 are provided at the top and bottom of the middle section of the rod 110, and the fixed portion 211 of the support member 210 is fitted between these upper and lower collars 140. Because the fixed portion 211 is fitted between these upper and lower collars 140, the support member 210 does not move up and down, but rotates freely in place. In other words, even if the rod 110 rotates, the rotational force is hardly transmitted to the support member 210, so the support member 210 does not rotate together with the rod 110. The two left and right extensions 212 extend from the fixed portion 211 in a direction perpendicular to the central axis of the rod 110. In other words, the two extensions 212 are aligned in a straight line with the fixed portion 211 in between. A guide member 220 is attached to the tip of each extension 212. The length of each extension 212 should be such that it is necessary to allow the guide member 220 to reach the H-shaped steel 300, as shown in the plan view of Figure 1.

[0024] As shown in the plan view of Figure 1, the guide member 220 is a member configured to slide between the flanges 310 of the H-shaped steel 300. The H-shaped steel 300 includes a pair of flanges 310 that are parallel to each other and a web 320 that is perpendicular to each flange 310 and bridges both flanges 310. The guide member 220 is a plate-shaped member with a width such that it fits between the pair of flanges 310. Specifically, in the plan view of Figure 1, the width of the guide member 220 is shown as W1, and the distance between the pair of flanges 310 is shown as W2. When the distance W2 between the pair of flanges 310 is set to 100%, the width W1 of the guide member 220 is preferably 80% or more and less than 100%, and is particularly preferably 85-99% or 90-98%. When the difference between the width W1 and the distance W2 is large, it can be adjusted by attaching a spacer to the guide member 220 as described later. Furthermore, there are no particular restrictions on the thickness of the guide member 220, but it is preferable that the thickness be such that the guide member 220 does not protrude from the side ends of the pair of flanges 310 when the guide member 220 is pressed against the web 320 of the H-shaped steel 300. However, even if the guide member 220 protrudes within 15 cm from the side ends of the pair of flanges 310 in this state, there is no particular problem.

[0025] Furthermore, as shown in the front view of Figure 1, in this embodiment, the guide member 220 has a lower guide plate 221 that extends downward from the support member 210. This lower guide plate 221 extends parallel to the central axis of the rod 110 of the stabilizer 200. The length of the lower guide plate 221 is not particularly limited, but is preferably 50 cm or more, and particularly preferably 100 cm or more, or 200 cm or more. The upper limit of the length of the lower guide plate 221 is from the mounting position of the stabilizer 200 on the rod 110 (i.e., the position where the collar 140 is provided) to the lower end of the auger head 130. In other words, the lower end of the lower guide plate 221 and the lower end of the auger head 130 may be aligned, but it is undesirable for the lower end of the lower guide plate 221 to protrude below the lower end of the auger head 130. As shown in Figure 1, the length of the lower guide plate 221 is preferably such that the lower end of the lower guide plate 221 reaches the upper end of the auger head 130, or that the lower end of the lower guide plate 221 reaches between the upper and lower ends of the auger head 130.

[0026] Figure 2 shows a modified example of attaching the stabilizer 200 to a multi-axis drilling machine 100. Figure 2(a) shows a three-axis drilling machine 100, and Figure 2(b) shows a five-axis drilling machine 100. As shown in Figure 2, in the case of a multi-axis drilling machine 100, multiple rods 110 are connected by connectors 150 at a constant interval. The stabilizer 200 is attached to the two outermost rods 110 of the multiple rods 110. In this case, each stabilizer 200 is composed of a support member 210 and a guide member 220, as described above. However, in each stabilizer 200, the support member 210 has an extension portion 212 that extends outwards from only one side toward the outside of the drilling machine 100 relative to the fixing portion 211 that is fixed to the rod 110. Also, since the extension portion 212 is only on one side, the number of guide members 220 attached to each stabilizer 200 is also one. Thus, when viewing the multi-axis drilling device 100 as a whole, the two stabilizing devices 200 position the guide members 220 on both the left and right sides of the entire drilling device 100. The present invention is not limited to the single-axis drilling device 100 shown in Figure 1, but is also applicable to multi-axis drilling devices 100 such as the three-axis or five-axis devices shown in Figure 2.

[0027] Figure 3 shows, in plan view, each step in the underground diaphragm wall construction method using a single-axis drilling device 100. The numbers 1 to 18 in Figure 3 indicate the order of each step. First, as shown in Figure 3(a), elements E consisting of only one borehole are formed at intervals using the drilling device 100 without the stabilizing device 200 attached. Here, elements E are formed in the order of 1 to 5. At this time, the interval between elements E is less than the width of one element. In other words, all elements E should be connected by forming other elements E in a later step between the elements E that are formed at intervals. When forming these elements, a cement-based suspension is injected into the borehole through the rod 110 of the drilling device 100.

[0028] Next, as shown in Figure 3(b), the H-shaped steel beams 300 are embedded in the excavated holes of each element E. In the example shown in Figure 3, the H-shaped steel beams 300 are embedded in the inside of each element E formed in steps 1 to 5, in steps 6 to 10. At this time, the orientation of the H-shaped steel beams 300 embedded in the element E is adjusted so that, in a plan view, all of the webs 320 are parallel. In other words, in a plan view, the flanges 310 of the H-shaped steel beams 300 embedded in the element E are aligned in a straight line.

[0029] Next, as shown in Figure 3(c), another element E is formed between elements E where H-shaped steel beams 300 are already embedded, connecting all the elements E. In this process, the excavation device 100 (see Figure 1) with the aforementioned stabilizing device 200 attached is used. That is, the guide member 220 of the stabilizing device 200 is slid along the H-shaped steel beams 300 embedded in the elements E, and the excavation device 100 is used to excavate. At this time, the H-shaped steel beams 300 function like rails to allow the excavation device 100 to descend straight down, so that the excavation device 100 can accurately form the elements E. In the example shown in Figure 3, in steps 11 to 14, more elements E are formed by the excavation device 100 with the stabilizing device 200.

[0030] Finally, as shown in Figure 3(d), the H-shaped steel beams 300 are embedded in the excavated holes of element E formed by the excavation device 100 with the stabilizing device 200. In the example shown in Figure 3, the H-shaped steel beams 300 are embedded in the interior of element E formed in steps 11 to 14, respectively, in steps 15 to 18. This results in the formation of a continuous retaining wall underground that includes the H-shaped steel beams 300 as core material.

[0031] Figure 4 shows, in plan view, each step of the underground diaphragm wall construction method using a three-axis drilling machine 100. The steps when using the three-axis drilling machine 100 are basically the same as the steps when using the single-axis drilling machine 100 shown in Figure 3. First, as shown in Figure 4(a), using the three-axis drilling machine 100 without the stabilizing device 200 attached, elements E consisting of three drilled holes are formed at intervals. Here, elements E are formed in the order of 1 to 3. Next, as shown in Figure 4(b), H-shaped steel beams 300 are embedded in each of the multiple drilled holes that make up each element E. In this example, H-shaped steel beams 300 are embedded in the inside of elements E formed in steps 1 to 3, in steps 4 to 6.

[0032] Next, as shown in Figure 4(c), another element E is formed between elements E where H-shaped steel beams 300 are already embedded, connecting all the elements E. In this process, the excavation device 100 (see Figure 2(a)) with the aforementioned stabilizing device 200 attached is used. That is, the guide member 220 of the stabilizing device 200 is slid along the H-shaped steel beams 300 embedded in the elements E while the excavation device 100 excavates. Specifically, in the case of a three-axis system, the guide member 220 attached to the rod 110 at the left end of the excavation device 100 is slid along the H-shaped steel beam 300 in the excavation hole at the right end of a certain element E. At the same time, another guide member 220 attached to the rod 110 at the right end of the excavation device 100 is slid along the H-shaped steel beam 300 in the excavation hole at the left end of another element E. In this example, in steps 7 and 8, further elements E are formed by the excavation device 100 with the stabilizing device 200. In this way, another element E is formed between two elements E. Finally, as shown in Figure 4(d), the H-shaped steel beams 300 are embedded in the boreholes of the elements E formed by the drilling device 100 with the stabilizing device 200. In this example, the H-shaped steel beams 300 are embedded in the interiors of the elements E formed in steps 7 and 8, respectively, in steps 9 and 10.

[0033] Figure 5 shows, in plan view, each step of the underground diaphragm wall construction method using a five-axis drilling machine 100. The process is basically the same as when using the single-axis drilling machine 100 shown in Figure 3, even when using the five-axis drilling machine 100. First, as shown in Figure 5(a), five elements E consisting of five drilled holes are formed at intervals using the five-axis drilling machine 100 without the stabilizing device 200 attached. Here, elements E are formed in the order of 1 to 2. Next, as shown in Figure 5(b), H-shaped steel beams 300 are embedded in each of the multiple drilled holes that make up each element E. In this example, the H-shaped steel beams 300 are embedded inside the elements E formed in steps 1 to 2, respectively, in steps 3 and 4.

[0034] Next, as shown in Figure 5(c), another element E is formed between elements E where H-shaped steel beams 300 are already embedded, connecting all the elements E. In this process, the drilling device 100 (see Figure 2(b)) with the aforementioned stabilizing device 200 attached is used. That is, the guide member 220 of the stabilizing device 200 is slid along the H-shaped steel beams 300 embedded in the elements E while the drilling device 100 excavates. Specifically, in the case of a 5-axis drilling device, the guide member 220 attached to the rod 110 at the left end of the drilling device 100 is slid along the H-shaped steel beams 300 in the excavation hole at the right end of a certain element E. At the same time, another guide member 220 attached to the rod 110 at the right end of the drilling device 100 is slid along the H-shaped steel beams 300 in the excavation hole at the left end of another element E. In this example, in step 5, another element E is formed by the drilling device 100 with the stabilizing device 200. In this way, another element E is formed between two elements E. Finally, as shown in Figure 5(d), the H-shaped steel beam 300 is embedded in the borehole of element E formed by the drilling device 100 with the stabilizing device 200. In this example, the H-shaped steel beam 300 is embedded in the inside of element E formed in step 5 in step 6.

[0035] Next, with reference to Figure 6, the specific configuration of the stabilizer 200 for one axis will be described. Figure 6(a) is a front view of the stabilizer 200, Figure 6(b) is a side view of the stabilizer 200, and Figure 6(c) is a top view of the stabilizer 200. The stabilizer 200 shown in Figure 6 is configured to be detachably attached to the rod 110 of the drilling device 100.

[0036] As shown in Figure 6, the stabilizer 200 is basically composed of one support member 210 and two guide members 220. The support member 210 can be separated into a left half 210(L) and a right half 210(R) which have a symmetrical shape. By combining these left half 210(L) and right half 210(R), a circular rod hole 211a is formed in the center. The rod 110 of the drilling device 100 is inserted into this rod hole 211a. These left half 210(L) and right half 210(R) each have a joint portion 211b, and the left half 210(L) and right half 210(R) are joined by aligning the joint portions 211b and inserting bolts (not shown) into bolt holes 211c provided in each joint portion 211b and tightening the bolts. By fastening the left half 210(L) and the right half 210(R) together, the aforementioned rod hole 211a is formed, and the area around it functions as a fixing portion 211. The left half 210(L) and the right half 210(R) each have extensions 212 that extend laterally from this fixing portion 211. Guide members 220 are attached to the ends of each extension 212 of the left half 210(L) and the right half 210(R).

[0037] Multiple bolt holes 220a are provided on the upper side of each guide member 220. When each guide member 220 is brought into contact with the extension portion 212 of the support member 210, bolt holes 212a are also provided in the extension portion 212 at the corresponding positions of the bolt holes 220a of each guide member 220. Therefore, the guide member 220 and the support member 210 are joined by aligning the bolt holes 220a on the side of the guide member 220 with the bolt holes 212a in the extension portion 212 of the support member 210 and fastening them with bolts (not shown). In addition, when the guide member 220 is joined to the support member 210, there is a lower guide plate 221 on the guide member 220 that extends below the support member 210. Multiple anti-slip devices 222 may be provided on the inner surface of the guide member 220, which is the surface that contacts the support member 210. The anti-slip component 222 is positioned to surround the support member 210 when the guide member 220 and the support member 210 are joined together. By providing this anti-slip component 222, it becomes easier to position the guide member 220 and the support member 210 when they are joined together, and it also makes it less likely for the positional relationship between the guide member 220 and the support member 210 to shift after they have been joined.

[0038] Furthermore, multiple bolt holes 220b are provided in the thickness portions on the front and back sides of the guide member 220. Spacers 230 can be attached to the guide member 220 using these bolt holes 220b. An example of a spacer 230 is shown in Figure 7. As shown in Figure 7, bolt holes 230a are also provided in the spacer 230, and this spacer 230 can be connected to the guide member 220 by bolting. The spacer 230 is a member for adjusting the width of the guide member 220. When the width of the guide member 220 is small compared to the spacing between the flanges 310 of the H-shaped steel 300, the discrepancy between the width of the guide member 220 and the spacing between the flanges 310 can be reduced by attaching spacers 230 to the edges on both the front and rear sides of the guide member 220. It is preferable to prepare multiple types of spacers 230 with different widths, for example, as shown in Figures 7(a) and 7(b). This allows the width of the guide member 220 to be appropriately adjusted according to the spacing between the flanges 310 of the H-shaped steel 300.

[0039] Figure 8 shows a modified version of the drilling device 100. In the example shown in Figure 8, the structure of the stabilizer 200 is mainly different from the example shown in Figure 1. In the modified version shown in Figure 8, the stabilizer 200 includes a (first) support member 210 and two guide members 220, as well as a second support member 240. The first support member 210 and the second support member 240 have similar configurations and mainly consist of the aforementioned fixed part 211 and extension part 212. In the example shown in Figure 8, both the first support member 210 and the second support member 240 are fixed to the rod 110 so as to be able to rotate freely, but the first support member 210 is located relatively lower, and the second support member 240 is located relatively higher.

[0040] Furthermore, each of the two guide members 220 has a lower guide plate 221 that extends downward from the first support member 210, and an upper guide plate 223 that extends upward from the first support member 210. As mentioned above, the lower guide plate 221 is long enough so that its lower end does not protrude below the lower end of the auger head 130. On the other hand, the upper guide plate 223 extends along the central axis of the rod 110 from the first support member 210 to the second support member 240. In other words, the lower part of the upper guide plate 223 is fixed to the first support member 210, and the upper part is fixed to the second support member 240. Therefore, when the lower guide plate 221 and the upper guide plate 223 are combined, the guide member 220 as a whole extends longer in the vertical direction along the central axis of the rod 110 compared to, for example, the example shown in Figure 1. In this way, it is also possible to increase the overall length of the guide member 220 by providing a lower guide plate 221 and an upper guide plate 223. This makes it possible to lower the excavation device 100 more precisely along the H-shaped steel beam 300.

[0041] In the example shown in Figure 8, a modified version of the stabilizer 200 corresponding to a single-axis drilling machine 100 is shown. However, following the example of the three-axis and five-axis compatible stabilizers 200 shown in Figure 2, for example, it is also possible to configure the modified version of the stabilizer 200 shown in Figure 8 to correspond to a three-axis or five-axis drilling machine 100.

[0042] Figure 9 shows a further embodiment of the present invention. This embodiment addresses cases where the insertion position of the H-shaped steel 300 is offset from the center of element E, such as when construction is carried out right at the site boundary. In general diaphragm wall construction, the center of element E and the center of the H-shaped steel 300 are constructed to coincide, but due to site constraints and other reasons, it may be necessary to insert the H-shaped steel 300 offset from the center of element E. Examples of site constraints include constraints on the distance from the site boundary, avoidance of interference with adjacent existing structures (building foundations, underground buried objects, existing piles, etc.), and the distribution of bedrock and hard ground present underground.

[0043] As shown by the dashed line in Figure 9(a), in this embodiment, the first element E(1) and the second element E(2) are formed at a predetermined interval, and the first H-shaped steel beam 300(1) and the second H-shaped steel beam 300(2) are embedded inside each of them. Here, the first H-shaped steel beam 300(1) and the second H-shaped steel beam 300(2) are positioned offset from the center of each element. In this situation, when forming the third element E(3) that connects the first element E(1) and the second element E(2), if the construction is carried out using the method described in the previous embodiments, a problem arises in that the center of the third element E(3) will be offset from the centers of the first element E(1) and the second element E(2).

[0044] To solve this problem, this embodiment employs a configuration in which the rod 110 of the drilling device 100 is intentionally eccentric by attaching spacers 230 to the stabilizer 200 in a specific arrangement. Specifically, the lateral width of the guide member 220 in the front-rear direction is adjusted by attaching the spacers 230 to only one side of the guide member 220 of the stabilizer 200. As a result, when the guide member 220 slides between the flanges 310 of the H-shaped steel 300, the entire drilling device 100 is configured to descend eccentrically in either the front-rear or rear-rear direction.

[0045] In the plan view of Figure 9(a), the drilling device 100 used to form the third element E(3) has spacers 230 attached to the guide members 220 on both the left and right sides of the stabilizer 200. These spacers 230 are positioned to eccentrically shift the drilling device 100 in the opposite direction to the eccentricity of the first H-shaped steel beam 300(1) in the first element E(1) and the second H-shaped steel beam 300(2) in the second element E(2). That is, if the first H-shaped steel beam 300(1) and the second H-shaped steel beam 300(2) are offset in one direction from the center of each element, the spacers 230 function to eccentrically shift the drilling device 100 in the opposite direction. At this time, the adjustment length (width) in the front-rear direction by the spacers 230 is set to approximately coincide with the eccentricity distance of each H-shaped steel beam 300(1,2) in the first and second elements E(1,2). This allows for proper control of the eccentricity of the drilling device 100, enabling the center of the third element E(3) to be precisely positioned at the desired location.

[0046] Figure 9(b) is a side view showing details of the guide member 220 with the spacer 230 attached. As shown in this figure, the spacer 230 is attached to only one side of the guide member 220, front or rear, which partially increases the overall width of the guide member 220. With the attachment of the spacer 230, when the guide member 220 slides between the flanges 310 of the H-shaped steel 300, the drilling device 100 descends at a position offset from the central axis.

[0047] This configuration allows the excavation device 100 to be eccentric in order to cancel out the eccentricity of the H-shaped steel beam 300(1) in the first element E(1) and the H-shaped steel beam 300(2) in the second element E(2). As a result, the center of the newly formed third element E(3) is aligned in a straight line with the centers of the first element E(1) and the second element E(2). This makes it possible to construct a continuous underground wall with high precision, even when there are constraints on the insertion position of the H-shaped steel beam 300.

[0048] The width and mounting position of the spacer 230 can be adjusted as appropriate according to the eccentricity of the H-shaped steel 300. Furthermore, by making the widths of the spacers 230 attached to the left and right guide members 220 different, it is possible to accommodate more complex eccentricity patterns. Thus, according to this embodiment, a continuous underground wall construction method can be realized that allows elements to be connected with high precision even under various construction conditions.

[0049] Figure 10 shows a further modification of the stabilizer 200. This modification adds an upper guide plate 223 to the configuration of the basic stabilizer 200 shown in Figure 6. Figure 10(a) is a front view, Figure 10(b) is a side view, and Figure 10(c) is a top view. In this modification, the guide member 220 includes an upper guide plate 223 that extends upward from the tip of the extension 212, in addition to a lower guide plate 221 that extends downward from the tip of the extension 212.

[0050] Unlike the embodiment shown in Figure 8, the upper guide plate 223 is configured to be relatively short, resulting in a simple configuration that does not require the second support member 240. The length of the upper guide plate 223 is optimized to be sufficient to improve the stability of the drilling device 100 while considering manufacturing costs and handling. In particular, the length of the upper guide plate 223 is designed to be approximately the same as the length of the lower guide plate 221. For example, the length of the upper guide plate 223 is preferably 80-120% of the length of the lower guide plate 221, and particularly preferably 90-110%.

[0051] By providing the upper guide plate 223 in this manner, the contact area between the flanges 310 of the H-shaped steel 300 is increased for the guide member 220 as a whole, allowing the drilling device 100 to descend more stably along the H-shaped steel 300. In particular, lateral sway and tilting when the drilling device 100 descends to depths can be effectively suppressed, improving the accuracy of element E formation. Furthermore, compared to the embodiment in Figure 8, the second support member 240 is unnecessary, simplifying the structure of the stabilizing device 200, which reduces manufacturing costs and improves ease of handling on site.

[0052] As shown in the plan view of Figure 10(c), the configuration of the support member 210, which consists of a left half 210(L) and a right half 210(R), is the same as that of the basic embodiment shown in Figure 6. The configuration of the rod hole 211a, joint portion 211, extension portion 212, etc., is also the same. This can be easily realized by simply adding an upper guide plate 223 to the stabilizer 200.

[0053] In this specification, embodiments of the present invention have been described with reference to the drawings in order to express the content of the present invention. However, the present invention is not limited to the above embodiments, and includes modifications and improvements that are obvious to those skilled in the art based on the matters described in this specification. [Explanation of symbols]

[0054] 100...Drilling equipment 110...Rod 120...Drilling blade 130...Auger head 140...Color 150...Connector 200...Stabilizer 210...Support member 210(L)…Left half 210(R)…Right half 211...Fixing part 211a...Rod hole 211b... Joint section 211c... Bolt hole 212...Extension portion 212a...Bolt hole 220... Guide member (guide part) 220a... Bolt hole 220b...Bolt hole 221...Lower guide plate 222... Anti-slip device 223... Upper guide plate 230...Spacer 230a...Bolt hole 240...Second support member 300...H-beam 310...Flange 320...Web

Claims

1. A drilling device that is rotationally driven by a drive mechanism to drill holes in the ground, One or more cylindrical rods, Multiple drilling blades provided on the circumferential surface of the rod, An auger head is provided at the lower end of the aforementioned rod, The rods are equipped with a stabilizing device attached to the outermost rod among the aforementioned rods, The stabilizer is, A fixing part is attached to a predetermined position of the rod so as to be able to rotate freely, An extension portion extending from the fixed portion toward the side of the excavation device, The extension portion has a guide portion provided at its end, The guide portion is configured to fit between a pair of flanges of an H-beam and to slide up and down along the web of the H-beam. Drilling equipment.

2. When the aforementioned rod has one axis, The stabilizer is attached to the single-axis rod, The extension portion extends from the fixed portion toward both sides of the excavation device. The drilling apparatus according to claim 1.

3. When the aforementioned rod has multiple axes, The stabilizer is attached to the two outermost rods of the rods, The extension portion extends from the fixed portion toward one side of the excavation device. The drilling apparatus according to claim 1.

4. The guide portion includes a lower guide plate that extends downward from the tip of the extension portion. The drilling apparatus according to claim 1.

5. The guide portion further includes an upper guide plate extending upward from the tip of the extension portion. The drilling apparatus according to claim 4.

6. A stabilizing device that can be attached to an excavation device that is rotationally driven by a drive mechanism for drilling holes in the ground, A fixing part that can be freely attached to a predetermined position on the cylindrical rod of the drilling device, An extension portion extending from the fixed portion toward the side of the excavation device, The extension portion has a guide portion provided at its end, The guide portion is configured to fit between a pair of flanges of an H-beam and to slide up and down along the web of the H-beam. Stabilizer.

7. A method for constructing a continuous underground wall, comprising: an excavator comprising an excavation device as described in claim 1 and a drive device for rotating the excavation device, injecting a cement-based suspension while forming an excavation hole in the ground, and burying H-shaped steel in the excavation hole into which the suspension has been injected, A first drilling step involves forming elements, each containing one or more boreholes formed in a single drilling operation by the drilling device, at multiple locations with predetermined gaps between them. A first embedding step involves embedding H-shaped steel into the excavated holes of each element formed in the first excavation step, A second excavation step, which is a step in which, after the first burying step, an element is formed by the excavation device in such a way as to connect adjacent elements formed in the first excavation step, wherein the guide portion of the stabilizer is fitted between a pair of flanges of the H-shaped steel embedded in adjacent elements, and the excavation operation is performed by the excavation device, The process includes a second embedding step of embedding H-shaped steel into the excavated holes of each element formed in the second excavation step. Continuous underground wall construction method.

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