JP7079971B2 - Blocking structure and construction method to block off-ground inaccessible areas - Google Patents

Description

The present invention relates to a blocking structure and a construction method for blocking a ground-inaccessible area.

For example, in order to prevent the outflow of radioactivity from the disaster accident site at the Fukushima Daiichi Nuclear Power Station, contaminated water from the industrial waste disposal site, and the spread of contaminated substances, the above-ground inaccessible area is underground for a certain area. It is necessary to block to the inside.

Then, in such a case, a blocking wall made of a steel pile pile (steel sheet pile) or the like is press-fitted into the ground from the ground surface around the river, for example, as used for the purpose of stopping the running water of a river or the like. It is common to block around the area, but to complete the block, including water stoppage in the ground, the bottom of the area must be blocked.

Therefore, for example, as presented in Japanese Patent Application Laid-Open No. 2003-1212, when a barrier wall made of a steel pile pile (steel sheet pile) or the like is pressed into the ground, the soil that blocks the area is dug up, for example, a gravel layer and a sand layer. A method of forming a barrier layer having a water purifying action as a bottom wall, or a method of press-fitting a steel sheet pile to an impermeable layer as presented in Japanese Patent Application Laid-Open No. 2018-16954 is presented.

However, in the conventional blocking structure and blocking method for a ground-inaccessible area using a blocking wall presented in Japanese Patent Application Laid-Open No. 2003-1212, it is necessary to dig up the blocking area once and a large integrated blocking. Large-scale construction such as the need for a wall is required, which is extremely uneconomical in terms of construction period and cost, and above ground using a barrier wall presented in Japanese Patent Application Laid-Open No. 2018-16954. There is a problem that an extremely long steel sheet pile must be press-fitted deep into the ground in the cut-off structure of the inaccessible area, and it is suitable especially when the ground-inaccessible area must be cut off urgently due to an accident such as a nuclear reactor. There is a problem that it is difficult to do.

Japanese Unexamined Patent Publication No. 2003-1212 Japanese Unexamined Patent Publication No. 2018-16954

The present invention solves the problems of the conventional blocking structure and construction method for blocking the inaccessible area on the ground, and in particular, by making it possible to install the bottom wall without digging up the ground. It is an object of the present invention to provide a blocking structure and a construction method for blocking an extremely economical inaccessible area on the ground, which reduces the construction period, does not require the treatment of excavated earth and sand, and does not require large-scale heavy machinery. ..

The blocking structure for blocking the above-ground inaccessible area, which is the present invention made to solve the above-mentioned problems, is a above-ground structure for blocking the underground underground of the above-ground inaccessible area by a blocking wall pressed from the ground surface toward the ground. It is a blocking structure for the inaccessible area, and four barrier walls surrounding the above-ground inaccessible area are arranged in a square shape surrounding the above-ground inaccessible area on the ground surface, and a pair of facing each other. Each of the barriers is vertically buried in the ground, and the other pair of opposing barriers is buried in the ground at an angle so that at least one base joins the other barrier at a predetermined angle. Further, both sides of each inclined barrier wall are in close contact with the vertical barrier wall, and each barrier wall is provided with a plurality of steel pile piles adjacent to each other in the width direction on both sides in the length direction. The vertical barriers are clamped together by locking them together by a stop, with the lower side of the steel pile pile located at the bottom being press-fitted along the inner surface of the sloping barrier. It is characterized in that other steel pile piles are formed by sequentially connecting them in the width direction toward the ground surface .

As described above, in the present invention, the barrier walls are connected by locking the steel pile piles adjacent to each other in the width direction by the locking portions provided on both sides in the length direction. A wall surface having a wide area can be formed only by press-fitting a plurality of steel pile piles in order.

In particular, the steel pile pile constituting the vertical barrier has a right-angled angle at which the bottom of one barrier in the pair of inclined barriers joins the other barrier , and the bottom of the pile pile is in the elongated direction. When formed at a right angle to the ground, the lower side of the steel pile pile located at the lowermost side is press-fitted along the inner side surface of the one blocking wall, and the other steel pile pile is placed on the ground surface. Since it is possible to form a nearly triangular vertical barrier wall by sequentially connecting them in the width direction, it can be constructed very easily using a long steel pile pile that is easy to handle during construction.

Furthermore, since the water blocking material injection pipe portion is formed on the back side or the front side of the steel pile pile along the long direction, the water blocking material is injected and solidified after the steel pile pile is driven to form a joint portion. Can be brought into close contact.

Further, the construction method of blocking the above-ground inaccessible area according to the present invention is a pair of vertical barriers and a pair of inclined barriers in which the base of at least one of the barriers is joined to the other barrier at a predetermined angle. The four barriers consisting of the above are press-fitted from the ground surface toward the ground so that the tops of the barriers are arranged in a square shape surrounding the inaccessible area on the ground surface, and both sides of the pair of inclined barrier walls are pressed. It is a method of constructing a blocking structure of a ground-inaccessible area that blocks the underground underground of the above -ground inaccessible area from the surroundings by bringing it into close contact with the pair of vertical blocking walls . After positioning the sensor thread points on the ground surface at predetermined intervals in the front-back and left-right directions in a plan view, the sensor threads are embedded vertically from each point toward the ground, and then the steel pile pile serving as the barrier is placed. By sequentially press-fitting, the sensor thread cut by the press -fitted steel pile pile is pulled out to the ground, and the position and length of the cut sensor thread are known , the ground related to the press-fitted steel pile pile. It is characterized in that the blocking wall is formed by confirming at least one piece of information among the medium depth , the press-fitting direction , and the press-fitting angle.

According to this construction method, it is possible to install the barrier while accurately grasping the predetermined press-fitting position of the barrier wall from the ground surface by a simple operation.

Further, in the present construction method, by injecting the water blocking material from the water blocking material injection pipe portion formed in the blocking wall after the blocking wall is press-fitted, the gap between the joints between the blocking walls is eliminated and leakage is ensured. In addition to preventing this, if necessary, it is possible to construct a more perfect barrier wall by injecting and solidifying cement along the inside of the barrier wall that was finally pressed into the ground.

According to the present invention, it is possible to form a blocking structure that blocks off-ground inaccessible areas with extremely simple work, and it is constructed without the need to dig up, even though it blocks not only the surrounding wall but also the bottom. It is possible to shorten the construction period, reduce the human burden and reduce the financial burden, and it is extremely effective especially in the case of an emergency such as a radiation leak accident.

It shows a preferable embodiment of this invention, (a) is a schematic diagram which shows the state before construction, (b) is the schematic diagram which shows the state after construction. FIG. 5 is a perspective view showing a part of a steel pile pile used in different embodiments of the present invention. Explanatory drawing which shows the use state of the steel pile pile shown in FIG. FIG. 3 is an enlarged plan view showing a connecting portion showing different embodiments of the locking portion formed at the side end of the steel pile pile. The construction method of the present invention shows different embodiments, (a) is a plan view, (b) is a sectional view taken along the line XX of FIG. 5 (a), and (c) is FIG. 5 (a). Sectional view along YY. It is an enlarged perspective partial view which showed a part of the embodiment shown in FIG. Explanatory drawing which shows the state which press-fits the steel pile pile which forms the barrier wall which press-fits in the vertical direction from a direction. FIG. 5 is an enlarged partial cross-sectional view of a steel pile pile according to the embodiment shown in FIG. 5, where (a) shows a connecting portion when a plurality of steel pile piles are connected and used in the press-fitting direction, and (b) is a stop. A lid is attached to the tip of the water material injection pipe to indicate a state of being press-fitted into the ground, and (c) shows a state in which the water-stopping material injected into the water-stopping material injection pipe is flowing out after the press-fitting. .. (A) is an explanatory diagram showing an outline of the embodiment shown in FIG. 5, and (b) and (c) are explanatory views showing an outline of a further different embodiment of the present invention. It shows a further different construction method of this invention, (a) is a plan view, (b) is a vertical sectional view.

FIG. 1 shows a preferred embodiment of the present invention, and shows a blocking structure 2 that blocks a contaminated ground-inaccessible area 1 including, for example, a company building B, and the blocking structure 2 is shown in FIG. As shown in (a), the top surface shown in FIG. 1 (b) is inverted as the square ground surface 3 by the four barrier walls 5, 6, 7, and 8 that are press-fitted from the ground surface 3 toward the ground 4. It is formed in a triangular column.

These barrier walls 5, 6, 7, and 8 have their respective tops 51, 61, 71, and 81 squared along the four sides 11, 12, 13, and 14 on the front, back, left, and right of the ground-inaccessible area 1 on the ground surface 3. For example, a pair of blocking walls 7 and 8 facing each other are formed into a right triangle having a right triangle at the lower end and are press-fitted into the ground 4 in the vertical direction, and the other pair of blocking walls 5 and 6 have their respective bases 52. , 62 are tilted so as to be joined to each other at an angle perpendicular to the angle of the lower end of the triangle of the barrier walls 7 and 8, and are press-fitted from the ground surface 3 toward the ground 4. The side surfaces 53, 53 and 63, 63 of the barrier walls 5 and 6 to be formed are in close contact with the side sides 73, 73 and the side sides 83, 83 of the vertically embedded barrier walls 7, 8 which are in contact with each other.

In the present embodiment having the above configuration, the four barrier walls 5, 6, 7, and 8 are placed in the ground 4 along the four sides 11, 12, 13, and 14 on the front, back, left, and right of the ground-inaccessible area 1. It is possible to form a blocking structure 2 that blocks the ground inaccessible area 1 by pressing it in contact with each other, and it is necessary to dig up the ground even though it is blocking including the bottom. It can be built without any problems, the construction period can be shortened, the human burden can be reduced, and the financial burden can be reduced.

2 to 7 show different embodiments of the present invention, and the basics of the blocking structure and the construction method are almost the same as those of the embodiment shown in FIG. 1, but the blocking wall 5 (6, 6). 7 and 8) are different in that they are formed by connecting long steel pile piles (so-called steel sheet piles) 55 (65, 75, 85) as shown in FIG. 2 in the width direction. The steel pile pile 55 (65,75,85) has a required length depending on the size of the blocking structure to be used, but a steel pile pile 55 (65,75,85) longer than a predetermined length can be used. In the case of use, those of a predetermined length are connected in the vertical direction and used.

More specifically, the steel pile pile 55 (65,75,85) used in the present embodiment is a steel pile pile 55 (65,75,85) adjacent to both sides in the length direction in the width direction. ) Are formed with hook-shaped locking portions 56 (66, 76, 86) having a hook-shaped cross section for connecting them to each other. This point has almost the same configuration as the one for construction that has been conventionally used for water stop sites and the like, but the steel pile pile 55 (65, 75, 85) used in this embodiment has a front side or a back side. A water blocking agent injection tube portion 57 (67, 77, 87) extending in the length direction is integrally formed at the center position in the width direction (back side in the present embodiment), and as shown in FIG. Similar to the construction method, the steel pile piles 55 (65,75,85) that are alternately placed on the front and back are locked adjacent to each other on the steel pile piles 55 (65,75,85) that were initially press-fitted to a predetermined depth position. The portions 56 (66, 76, 86) are fitted and locked in the vertical direction and sequentially closely connected in the width direction to form a wide barrier wall 5 (6, 7, 8) as shown in FIG. It is a thing. It should be noted that the same driving machine and press-fitting machine as before can be used for press-fitting.

In the present embodiment, it is preferable that the locking portions 56 (66, 76, 86) are hook-shaped and are tightly connected and locked to each other in cross sections formed on both sides in a general length direction. Not limited to this, for example, as shown in FIGS. 4A and 4B, a chamfer is formed and the locking portion 56 (65,75,85) is fitted adjacent to the inner side surface of the locking portion 56 (65,75,85). An auxiliary protrusion 561 (661, 761, 861) that is in close contact with the outer surface of the portion 56 (65, 75, 85) is formed, or the hook is made into a double square shape as shown in FIG. 4 (c). It is also possible to make the bonding more closely and reliably, which is particularly effective for the blocking effect. Of course, a waterproof material such as rubber or elastic resin may intervene in the locking portion (not shown).

5 and 6 show a blocking structure 2 and a method for constructing the blocking structure 2 that blocks the above-ground inaccessible area 1 according to the present invention by using the steel pile pile 55 (65, 75, 85) shown in FIGS. 2 and 3. It shows a preferable embodiment at the time of implementation, and first, as shown in FIG. 5 (a), it is formed on the ground surface 3 by four sides 11, 12, 13, 14 on the front, back, left and right, and is blocked from entering the ground. A square is positioned in the area 1, and then the sides of the square defined on the ground surface 3 are locked alternately in the width direction using a large number of steel pile piles 55 and 65 as shown in FIG. Along 11 and 12, the same pair of barrier walls 5 and 6 as shown in FIG. 1 are formed by press-fitting them into the ground 4 in an inclined manner so as to face each other.

At this time, in the present embodiment, the barrier walls 5 and 6 are buried with the steel pile piles 55 and 65 having a predetermined length inclined, and the bottom 52 of one of the barrier walls 5 is also inclined and buried. It is press-fitted in an oblique direction (in the present embodiment, an angle of 45 degrees) so that the angle of joining to the barrier wall 6 is a right angle.

Theoretically, the barrier walls 5 and 6 may have their bases 52 and 62 just in contact with each other in the ground as shown in FIG. 1, but the bottoms 52 and 62 actually need to touch each other in the ground. Since it is difficult to construct so that they are in direct contact with each other, the line and the surface are joined by joining the base 52 (62) of one barrier 5 (6) to the other barrier 6 (5). It is easy to install.

Then, as shown in FIG. 5 (c), the vertical barrier 7 (8) forms a base 752 (852) at a right angle to the elongated direction, and a plurality of steel pile piles 75 ( 85), and the lower side of the steel pile pile 751 (851) located at the lowermost side is press-fitted along the inner surface of the inclined for example barrier wall 6 to press the other steel pile pile 75 (851). 85), while alternately locking the front and back surfaces in the width direction, sequentially connect the front and back surfaces in the width direction toward the ground surface 3, thereby forming substantially triangular vertical barrier walls 7 and 8.

As described above, in the present embodiment, the steel pile piles 75 (85) are sequentially press-fitted so as to be stacked at an angle of 45 degrees from the lower side to the upper side along the barrier wall 5 (6) buried by being inclined earlier. By doing so, the cutoff structure 2 can be quickly and surely constructed in a wide range of inaccessible areas 1 on the ground by a simple construction method of sequentially locking and connecting in the width direction.

In FIG. 6, the steel pile pile 75 is sequentially press-fitted by stacking the steel pile pile 75 from the bottom to the top at an angle of 45 degrees along the cut-off wall 5 buried at an angle to form the cut-off wall 7. It is a schematic diagram which shows the state at the time of forming, and the joint in the ground between the barrier 5 and the barrier 6 is, for example, of the steel pile pile 65 forming the barrier 6 which is press-fitted in the inclined direction as described above. The tip is embedded so that the tip protrudes from the steel pile pile 55 forming the blocking wall 5 which is arranged in the inclined direction facing each other, so that the bottom 52 of the blocking wall 5 is surely placed in the blocking wall 6 at a predetermined right angle. It can be joined, facilitating the actual construction.

Furthermore, since the bottom 752 of the steel pile pile 75 is formed at a right angle to the elongated direction, if the bottom 752 of the steel pile pile 75 is joined to the barrier wall 5, it will be naturally and closely joined. , The blocking effect can be easily ensured.

Further, as shown in FIG. 6 (b), each steel pile pile 75 (the same applies to 85 shown in FIG. 5 (c)) may have, for example, a fixing member (locking hole) installed on the back surface. ) 78 has a rope 79 extending to the base end side, and the rope 79 can be pulled in a predetermined direction and press-fitted while adjusting the depth and the joining position of the adjacent steel pile pile 75.

The rope 79 can be similarly installed on other steel pile piles 55 (65, 75, 85) shown in FIG. 2 (not shown), and these ropes are removed as they are. Instead, for example, by arranging the base end on the ground surface, it can be used to pull out each steel pile pile 55, 65, 75, 85 when the cutoff structure 2 is later released or reconstructed.

Further, in the present embodiment, the steel pile piles 55, 65, 75, 85 have water blocking material injection pipe portions 57, 67, 77, 87 on the back side as shown in FIG. 3, respectively, along the elongated direction. It is formed, and when each steel pile pile 55, 65, 75, 85 is press-fitted in place, or all the steel pile piles 55, 65, 75, 85 are press-fitted, the barrier walls 5, 6, 7, 8 are formed. When the burial is completed, the waterproofing agent is injected using the waterproofing agent injection pipes 57, 67, 77, 87 to waterproofly join the contact parts between the blocking walls 5, 6, 7, and 8. Therefore, a blocking structure 2 is formed that more reliably blocks the ground-inaccessible area 1.

In the present embodiment, since the water blocking agent injection pipe portion 57 (67, 77, 87) is integrally formed with the steel pile pile 55 (65, 75, 85), it may be deformed or damaged during press fitting. It also has the effect of increasing the rigidity of each steel pile pile 55 (65, 75, 85).

Further, the water blocking material may be poured directly into the water blocking agent injection pipe portion 57 (67, 77, 87), but for example, a supply pipe formed of a material having an inner surface for circulating the water blocking material for lubrication (shown in the figure). The water blocking material may be injected from the base end to the tip of the water blocking agent injection pipe portion 57 (67, 77, 87) through the supply pipe, and in this case, the water blocking material may be injected more smoothly. A water blocking material can be injected.

Furthermore, the water blocking material has a high degree of softness and fluidity without sudden connection, and by using a material that requires a long time for solidification, the water blocking material is spread over a predetermined water stopping point and stopped reliably. It can exert a water effect.

In the present embodiment, a case where a steel pile pile 55 (65, 75, 85) having a predetermined length is used is shown, but it is longer when, for example, it corresponds to a wide ground inaccessible area 1. Long steel pile pile 55 (65,75,85) is required, but such long steel pile pile 55 (65,75,85) is impractical for transport, storage and press fitting during implementation. As shown in FIG. 7 (a), steel pile piles 55 (65, 75, 85) having a predetermined length can be easily carried out by sequentially stacking and press-fitting them in the underground direction.

In particular, in the present embodiment, since a plurality of steel pile piles 55 (65,75,85) having a predetermined length are sequentially stacked and press-fitted in the underground direction, each steel pile pile 55 (65,75,85) is press-fitted. ), The upper end and the lower end are formed with stepped portions 551 (651, 751, 851) and 552 (652, 752, 852) in the thickness direction in which they can be fitted to each other, and are fitted unevenly to prevent misalignment.

Further, in the present embodiment, since the water blocking agent injection pipe portion 57 (67,77,87) is formed on the steel pile pile 55 (65,75,85), as shown in FIG. 7A, The diameter of the base end side of the lower water blocking agent injection pipe portion 57 (67,77,87) is formed wider than the diameter of the tip side of the upper water blocking agent injection pipe portion 57 (67,77,87). By keeping the water-stopping material injected into the upper water-stopping agent injection pipe portion 57 (67,77,87), the water-stopping material does not leak at the connection portion and the lower water-stopping agent injection pipe portion 57 (67,77,87). Water is injected into the water stop material and the water blocking material is injected into a predetermined position.

Further, in the present embodiment, as shown in FIG. 7B, a lid 571 (671, 771, 871) is attached to the tip of the water blocking agent injection pipe portion 57 (67,77,87). This lid 571 (671, 771, 871) has a water blocking agent injection pipe portion 57 (water blocking agent injection pipe portion 57) in which earth and sand enter from the tip opening when the steel pile pile 55 (65,75,85) is press-fitted into the ground 4. 67,77,87) can be prevented from being clogged, and as shown in FIG. 7 (c), the waterproofing material is applied from the waterproofing agent injection pipe portion 57 (67,77,87). When injected, it opens to allow the water blocking material to flow out.

In the present embodiment, as shown in FIG. 8A, the square blocking walls 5 and 6 have the same lengths of the sides 53 and 63 of each other, so that the sides 11 and 12 of the square are used. The bottoms 52 and 62 are joined to each other at the center of the wall, but the present invention is not limited to this, and as shown in FIGS. 8 (b) and 8 (c), the barrier walls 5 and 6 having different lengths of the sides 53 and 63 It can also be carried out when using the above method, and it is particularly effective when press-fitting is difficult due to the ground or the like, or when the depth of contamination is not uniform.

In addition, in the present embodiment, if necessary, by injecting cement from the lowermost end of each inward along the steel pile pile 55 (65, 75, 85) after constructing the blocking structure 2, it is more complete. It can be a water-impervious structure. When injecting cement, it is possible to inject inward along the steel pile pile 55 (65,75,85), or it is also possible to use an oblique hole or a vertical hole drilled from the ground surface 3 by boring. It is particularly desirable that the cement be cement milk mixed with water.

If further strength reinforcement is required after injecting water blocking material or cement, an oblique hole drilled from the ground surface 3 along the inner wall surface of the steel pile pile 55 (65,75,85). Alternatively, the ground may be improved by placing concrete using vertical holes.

FIG. 9 shows a preferred embodiment of a construction method for more easily constructing the blocking structure 2 of the embodiment shown in FIGS. 2 to 6, and first, FIG. 9A shows. As shown, after positioning a large number of sensor thread points at predetermined intervals in the front-back and left-right directions in a plan view within the ground-inaccessible area 1 that is at least blocked from the ground surface 3, each point is vertically directed toward the ground. The sensor thread 9 is embedded.

Then, next, the steel pile piles 55 and 65 for forming the barrier walls 5 and 6 as shown in FIGS. 2 to 6 are sequentially press-fitted along the buried sensor thread 9, but at this time. , As shown in FIG. 9B, for example, when the steel pile pile 55 and the steel pile pile 65 for constructing the barrier wall 5 and the barrier wall 6 are sequentially press-fitted in a predetermined diagonal direction, the press-fitted steel pile pile 55 and Since the sensor threads 9 suspended in the ground 4 are sequentially cut by the steel pile pile 65, the cut sensor threads 9 are pulled out to the ground and the position and length of the sensor threads 9 pulled out to the ground. By knowing the information, information such as the underground depth, press-fitting direction, and press-fitting angle of the press-fitted steel pile pile can be confirmed, and the barrier wall can be joined to a predetermined location in the ground 4, for example, at a right angle, reliably and easily. Can be buried in.

In the present embodiment, if the barrier 5 and the barrier 6 are accurately press-fitted into a predetermined design position, the other vertically extending barrier wall 7 and the barrier 8 will be the steel pile pile 55 and steel. It may be press-fitted along the pile pile 65, but if necessary, the sensor thread 9 that can be cut at the time of press-fitting the steel pile piles 75 and 85 is vertically inserted at a predetermined position in the same manner as the barrier wall 5 and the barrier wall 6. It is also possible to bury it and press it in more reliably while adjusting in the same way. Further, if necessary, the water blocking agent is injected from the water blocking agent injection pipe portion formed on the blocking wall after the barrier structure is constructed, or cement is applied along the inside of the blocking wall (the steel pile pile). By injecting, a more complete impermeable structure can be obtained.

Further, as shown in FIG. 9A, by installing a pipe 10 having a length corresponding to the length of the sensor thread 9 to be cut after completion, various investigations after completion can be performed. It can be used as piping.

1 Ground-inaccessible area, 2 Block structure, 3 Ground surface, 4 Underground, 5, 6, 7, 8 Block wall, 9 Sensor thread, 10 Piping, 11, 12, 13, 14 sides, 5, 6, 7, 8 Block wall, 51,61,71,81 top side, 53,63,73,83 side side, 52,62 bottom side, 55,65,75,85 steel pile pile, 56,66,76,86 locking part , 57,67,77,87 Water stop material injection pipe, 78 fixing member, 79 rope, 751,851 steel pile pile, 752,852 bottom, 571,671,771,871,572,672,772,872 steps Department

Claims (5)

It is a blocking structure of the above-ground inaccessible area that blocks the underground underground of the above-ground inaccessible area from the surroundings by the blocking wall that is press-fitted from the ground surface to the ground.
The four barriers surrounding the above-ground inaccessible area are arranged in a square shape surrounding the above-ground inaccessible area at the top of each of the above-ground barriers, and the pair of facing barriers are vertically in the ground. The other pair of opposing barriers are buried in the ground with at least one base tilted to join the other barrier at a predetermined angle, and both sides of each sloped barrier are It is in close contact with the vertical barrier and
Each of the barrier walls is connected by locking a plurality of steel pile piles adjacent to each other in the width direction by locking portions provided on both sides in the length direction.
In the vertical barrier, the lower side of the steel pile pile located at the lowermost side is press-fitted along the inner surface of the inclined barrier, and the other steel pile piles are sequentially widthwise toward the ground surface. A blocking structure that blocks off-ground inaccessible areas, characterized by being formed by connecting to . The angle at which the bottom of one barrier in the pair of inclined barriers joins the other barrier is at a right angle, and the steel pile pile constituting the vertical barrier has a base with respect to the elongated direction. The blocking structure for blocking a ground-inaccessible area according to claim 1, wherein the structure is formed at a right angle. The blocking structure for blocking a ground-inaccessible area according to claim 1 or 2, wherein the steel pile pile has a waterproof material injection pipe portion formed on the back side or the front side along a long direction. Four coupures consisting of a pair of vertical coupures and a pair of sloping coupures where the bottom of at least one coupure joins the other coupure at a predetermined angle, each at the top of the ground. The above-ground inaccessible area is press-fitted from the ground surface toward the ground so as to be arranged in a square surrounding the above-ground inaccessible area, and both sides of the pair of inclined barriers are brought into close contact with the pair of vertical barriers. It is a method of constructing a cut-off structure in an inaccessible area above the ground that cuts off the underground underground from the surroundings.
First, the sensor thread points are positioned on the ground surface in the above -ground inaccessible area at predetermined intervals in the front-back and left-right directions in a plan view, and then the sensor threads are embedded vertically from each point toward the ground.
Next, the steel pile pile serving as the barrier wall is sequentially press-fitted, the sensor thread cut by the steel pile pile is pulled out to the ground, and the position and length of the cut sensor thread are known. A blocking structure for blocking the above-ground inaccessible area, which comprises confirming at least one information of the underground depth , the press-fitting direction , and the press-fitting angle regarding the press-fitted steel pile pile to form the blocking wall. How to build. Each of the barrier walls is connected by locking a plurality of steel pile piles adjacent to each other in the width direction by locking portions provided on both sides in the length direction.
In the vertical barrier, the lower side of the steel pile pile located at the lowermost side is press-fitted along the inner surface of the inclined barrier, and the other steel pile piles are sequentially widthwise toward the ground surface. The method for constructing a blocking structure for blocking a ground-inaccessible area according to claim 4, wherein the steel is formed by connecting to.

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