JP4382987B2 - Tubular structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to the field of construction and public works, and is particularly directed to underground traffic structures, particularly underground traffic structures for vehicles.
In particular, the present invention relates to a prefabricated element de piedroit suitable for the underground traffic structure.
[0002]
[Prior art]
Highways, especially railway traffic paths (railways), must have a cross-sectional shape that is as constant as possible to avoid excessive slopes, making it impossible for certain segments to follow the natural ground level, It will deviate from the ground in either direction. At the intersection, it is necessary to pass the other road under one road.
If there is no significant difference in height between the underground traffic path and the natural land, an open trench (tranchee ouverte) is formed and the bottom of this trench is brought to the desired height, It is advantageous to refill the natural ground height by embedding the structure after construction to cover the open trench.
[0003]
The inventors have developed a construction method suitable for this type of structure. This method is described, for example, in the documents of European Patent Application No. 0,081,402 or US Patent Application No. 4,836,714. In this method, a plurality of prefabricated wall elements are sequentially arranged in the front-rear direction on a plate-form formed at the bottom of the trench.
European Patent Publication No. EP-A-0,081,402 has an upper element that forms an arch in a cross-section across the center line, which upper element is connected to each side wall (pied) on both sides of the radier. -droit) The longitudinal upper joint portion between the upper edge of the two side walls and the arch is preferably a joint that provides relative flexibility to the structure during the fill operation. Furthermore, it is advantageous to curve the upper part of the side wall inwardly and join it tangentially to the arch to form a continuous arch. In addition, a prefabricated or spot-fired floor element is placed between the bases of the two side walls, and the inside of the side wall bases are joined together with concrete joints that form longitudinally rigid connections, resulting in an overall flat foundation. So that the load is distributed over a large surface area.
[0004]
If the opening span of the structure is large, the floor elements can be eliminated and each side wall can be placed on a wide foundation. The foundation dimensions in this case are calculated based on the applied load and the soil durability. This configuration is described in US Patent Application No. 4,836,714.
By using the above method, it is possible to actually construct a structure having a very large size, for example, an underground highway having a plurality of lanes composed of a plurality of passing lanes adjacent to each other. In the case of a structure having two passing lanes, the two passing lanes are separated by a central side wall, two arch elements are supported by the central side wall, and the outside of each arch element is supported by each side wall.
[0005]
This method is an important development theme because a structure having a very large cross section can be constructed quickly and economically. In other words, all the structures used in this method are prefabricated that can be economically and safely manufactured in a well-equipped specific factory, manufacturing conditions such as concrete composition, water content, rebar position, formwork It is possible to strictly control the surface condition when the is removed. Therefore, the prefabricated element can be made thinner even with a larger span than a concrete construction manufactured on site (concrete). Also, the prefabricated element can be handled and installed by a forklift which is generally always arranged at a construction site.
With this method, even if you dig a long distance near the residential area, after the construction of the structure, it can be covered with embankment to restore the original natural ground height and appearance, and almost completely sound-insulated This method is especially suitable for use on city bypasses, highways through nature reserves and railways.
[0006]
The elements used in this method are relatively thin and can be assembled very accurately, so each element has a certain flexibility and the side walls bend when supporting embankments and excessive loads, As a result, the force applied to the upper part of the structure is reduced, and the structure is pushed laterally toward the embankment.
However, in urban areas, for example, when a road is built near an existing structure such as a foundation of a house or a sewer pipe or a basement, a fill that can absorb the force applied in the lateral direction is placed on both sides of the structure. It can be difficult.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a novel method capable of solving the above problems. That is, in particular, when a road is constructed above an urban area or a natural surface height, it is not necessary to fill in to absorb the thrust in the lateral direction.
[0008]
[Means for Solving the Problems]
The present invention is a tubular building in which a plurality of wall elements are arranged in the front-rear direction to form a tubular structure having a longitudinal axis, and each wall element forms a side wall that is sequentially arranged in a front-rear direction on a flat surface. It consists of at least three prefabricated wall elements consisting of two side elements and at least one upper element, each side wall consisting of a substantially vertical wall, which is a flat bottom surface supported by a top edge and a flat surface And the upper element has an inwardly curved cross section and is supported on the upper edge of the two side wall elements along two longitudinal joints and joined tangentially to the top of the side wall The invention relates to a tubular building adapted to form a continuous arch for transmitting a load to the base of the side wall.
In the tubular building of the present invention, at least some of the side wall elements are shaped so as to have sufficient rigidity to absorb and transmit the applied load even when there is no lateral support by the embankment covering the structure. is doing.
[0009]
Embodiment
In a preferred embodiment of the invention, each side wall element located outside the structure comprises at least one reinforcing rib that resists deformation under the action of a load applied by the upper element, which reinforcing rib extends on at least one side of the side wall. ing.
In a further advantageous embodiment, the upper element comprises a rigid plate extending upwards. The plate extends along at least one lateral surface outside the structure to stably maintain the minimum thickness of the fill covering the upper element.
The invention further relates to a prefabricated wall element designed for the structure.
[0010]
The present invention relates to a technique applicable to a particular situation which is an extension of the known tubular structure technique with many advantages. That is, in the conventionally known method, it is necessary to construct an underground passage when the road surface is lower than the height of natural land, and conversely, when the terrain is lower than the road surface height, It was thought that the road surface had to be built to restore the desired height. For this reason, traffic noise and environmental destruction problems have arisen in urban areas, and in most cases it was necessary to provide sound insulation walls. However, it was expensive, not aesthetic and sometimes ineffective.
According to the present invention, the novel structure design method can reliably protect the environment over the entire length of the road and alleviate the above problems.
[0011]
That is, another feature of the present invention is to construct the structure at a height that at least partially exceeds the height of natural land. After covering the land with the first embankment including the upper part forming the flat surface on which the tubular structure is arranged, each element is arranged, the entire structure and the first embankment are covered with the second embankment, and the second embankment is covered. Artificial hills are formed continuously with natural land. The width of the flat foundation of the structure is determined based on the bearing capacity of the first embankment so as to transmit the load without the risk of excessive settlement.
Other advantageous aspects of the invention are set forth in the appended claims and will become apparent from the following description of embodiments with reference to the accompanying drawings. However, the present invention is not limited to the following examples.
[0012]
【Example】
FIG. 1 is a conceptual longitudinal sectional view of a part of a road in the case where the road of the present invention is constructed on land with considerably large undulation. A line 10 represents an intersection of the vertical plane P passing through the vertical axis of the road and the natural land 1 and corresponds to a vertical sectional view of the natural land 1. This road is laid on the flat surface A, and is composed of a portion 11 located below the height of natural land and a portion 12 located above the height of natural land. The portion 11 is made as the base of the bottom of the trench B, and the portion 12 is formed above the embankment C.
In the cut-off portion 11, the flat surface A forming the road is covered with the same tubular structure D as in the conventional method. After the tubular structure D constituting the underground road is constructed on the open-air, the embankment E is backfilled to restore the natural land height 14. This structure can be completely sound-insulated, can restore the environment, and can be planted on the embankment E, which is especially advantageous for urban bypass construction.
[0013]
In the embodiment described in EP 0,081,402, the tubular wall B is composed of a series of segments arranged end to end with each other, and when viewed in cross-section, each segment has at least three elements or 2 It consists of two side walls 22, 22 'and an upper element 21 supported on it and curved inward. Each sidewall has a flat base that allows the sidewall to stand perpendicular to the land. The inner ends of the bases of the side walls can be joined to the fourth element forming the radier by means of a concrete longitudinal joint, so that the load applied to the tubular wall is transmitted to the base of the large surface area be able to.
[0014]
You can also eliminate the floor. In that case, the side walls 22, 22 'have a wide base 23 with two wings, an inner wing and an outer wing, as shown in FIG. This base provides a sufficient support surface for the element. Each side wall 22, 22 'is composed of a side wall 24 having an upper portion 25 curved inwardly. This side wall is joined tangentially to the upper element 21 to form an almost semicircular arch with the overall structure being transverse in cross section and centered on the vertical axis 0.
The longitudinal joint 26 between the upper element 21 and the upper edge of the two side walls 22, 22 'is constituted by a joint part centered on the planes P1, P'1. The curve center of the upper element 21 and the upper part 25 of the side walls 22, 22 'is in these planes P1, P'1. Each joint surface is preferably inclined by 45 degrees with respect to the vertical surface.
[0015]
In this known structure, the load applied to the upper element 21 is transmitted through the contact surfaces with the two side walls 22, 22 '. Each side wall is supported on the ground via the base 23, but since the structure is flexible and utilizes an articulation joint 26, the upper element 21 tends to warp slightly, thereby 22 and 22 'are also curved and spread laterally toward the fill E. Therefore, the embankment must be performed so as to absorb the lateral force applied by the two side walls 22, 22 'and contribute to the durability of the entire structure.
[0016]
However, as already mentioned, there are cases where the lateral direction cannot be supported by the surrounding land.
In such a case, the sidewall must withstand the load applied by the upper element. In the present invention, the rigidity of the side wall is increased so as not to bend under load. That is, as shown in FIG. 3, a reinforcing rib 37 is disposed outside the wall 34 of each side wall element 32, and the reinforcing rib 37 extends from the base 33 to the upper joint 36. The side wall 32 thus increased in rigidity can transmit a load in the vertical direction without the lateral support by the embankment 5.
This structure is particularly advantageous in the case of land with large undulations as shown in FIG.
That is, when the height of the flat surface 11 coincides with the natural land height 1 at the position 13 of the longitudinal section 10, the arch structure is stopped at that point, and from there on the embankment C or over the road Is built on the street. Therefore, the surrounding environment is harmed and it is often required to construct sound insulation walls on both sides of the road in urban areas, but the construction of the sound insulation walls is expensive and not aesthetic.
[0017]
In the present invention, rather than stopping the construction of the tubular structure at the exit of the trench B, the tubular structure 2 is extended by a similar structure 3 shown in FIG. 3 (cross section along line III-III in FIG. 1). To do.
For this purpose, the first embankment is built in alignment with the portion 11 of the flat surface A, the upper portion 41 is flattened to form the flat surface 12, and the tubular structure 3 is placed on this flat surface.
[0018]
FIG. 4 is an overall perspective view. In this figure, only one segment (trancon) of the tubular structure 3 is shown for the sake of simplicity. This structure 3 includes at least three elements in a cross section transverse to the axis 0, namely an inwardly curved upper element 31 and two side walls 32, 32 'supporting the upper element 31 along a longitudinal joint 36. These wall elements are prefabricated and have exactly the same cross section as the elements 21, 22, 22 ′ of the structure 2, and are therefore preferably arranged in alignment with the latter elements. Similarly, the longitudinal joint 36 is aligned with the longitudinal joint 26 of the structure 2 and constitutes a joint that allows the structure to be relatively deformed.
[0019]
Each side wall 32 includes a base 33 supported by the flat surface 12. After arranging the elements constituting the structure 3 aligned with the structure 2, the whole is covered with the second bank 5. The surface 50 of the second bank 5 is continuous with the natural land 1 and the surface 14 of the bank E to form an artificial hill. It is preferable to plant trees on this hill to restore the surrounding environment in terms of beauty.
Therefore, almost complete sound insulation is achieved even in a portion where the flat surface A is higher than natural land.
Further, the traffic on the road covered in this way is not visible from the neighboring building F.
In urban areas, the additional costs for the construction of the structure 3 and the second embankment 5 can be supplemented by these important advantages.
[0020]
Each side wall 32, 32 ′ is composed of a base 33 that forms a wide base 33 and a side wall 34 that curves inward as in the case of the structure 2. The side walls are tangentially connected to the upper element 31. Since the upper element 31 and the side wall 32 have the same cross section as the corresponding elements 21 and 22 of the embedded structure 2, the mold is the same as the mold for the structure 2 except for the improvement for forming the reinforcing rib 37. Can be manufactured using.
Taking into account the bearing capacity of the first fill 4, the base 33 of each side wall 32 can also be expanded inward and outward. The support force of the bank 4 tends to be smaller than the support force of the bottom 11 of the trench B, that is, the bottom 11 provided on natural land.
[0021]
However, as already mentioned, this type of prefabricated element can be produced in a factory far away from the site and transported by land even if it has a large span. Each element can be placed on the trailer in the length direction.
Therefore, in the case of prefabricated elements with large dimensions, the element is designed so that its weight is as small as possible, and the reinforcing ribs are added to the side walls, so the width of the base 33 can be reduced so that the width can be expanded after installation. It is desirable to provide a smooth support surface.
[0022]
For this purpose, the stub rebars 42a, 42b can be protruded from both sides of the base 33, ie from the outside 33a and the inside 33b, during the manufacture of the side wall element as shown in FIG. By doing so, it is possible to reduce the weight of the side wall element and not to exceed the transport capacity. After the element is installed, the extension portions 44a and 44b are poured into both sides of the base portion 33 by using an appropriate mold to widen the base portion 33, thereby reducing the load applied to the embankment 4. In this way, by reducing the width of the base portion 33, an increase in weight due to the provision of the reinforcing rib 37 can be offset. Alternatively, a plurality of continuous vertical reinforcing bars 45 can be inserted into the stub reinforcing bar 42 and the side wall elements can be covered to form a vertical beam in which the elements are firmly connected to each other. As a result, the durability of each element can be improved against uneven settlement.
Furthermore, in order to increase the support surface, a floor 43 with the necessary rebar can be poured between the inner ends of the two side wall elements 32, 32 '(where the stub rebar 42b is embedded).
[0023]
Although FIG. 3 shows a structure constructed on a substantially horizontal natural land 1 for ease of explanation, in practice the natural land along the direction perpendicular to the longitudinal axis of the structure is shown. The slope line may increase or decrease between the ascending slope 16 and the descending slope 15 with respect to the horizontal line.
FIG. 6 shows an example. In this case, in the region where the flat surface 11 passes above the height 1 of the natural land, the structure side facing the downward slope is arranged on the embankment 61, and the side facing the upward slope is the bottom of the excavation part 62 It must be supported by.
[0024]
The structure of the present invention is particularly suitable for such situations. That is, the use of the prefabricated side wall 32 supported on the wide base and supporting the upper element 31 via the longitudinal joint 36 as described above may result from asymmetric support as described above. In particular, the durability against uneven settlement can be increased.
[0025]
FIG. 6 shows a structure having two arches of the type described in EP-A-0,202,256. This structure is particularly suitable for the construction of motorways and has at least two roads S1, S2 on either side of the central side wall 63. Two upper elements 64, 64 'are installed on the central side wall 63, and these upper elements are respectively supported by the side walls on the outside, that is, the up-gradient side wall 65 and the down-gradient side wall 65'.
[0026]
As shown in FIG. 6, the embankment 5 that covers the entire structure and is continuous with the natural land is asymmetric, but the load is transmitted in the vertical direction by the side walls 65, 65 ′ provided with rigidity by the reinforcing rib 37. Therefore, the asymmetry of the embankment 5 does not affect the stability of the structure.
3 and 6 also show another embodiment improved by the present invention. That is, since the second bank 5 formed on the first bank 4 may slip, it is preferable to attach a concrete plate 38 to the outside of each upper element 31 as shown in FIG. The plate 38 extends upward and holds the upper part 51 of the embankment 5 that covers the structure. Therefore, the structure is always covered with a soil cap, and the overall stability is increased by its weight. The holding plate 38 is preferably perpendicular to the outside of the wall element 31 (and thus parallel to the joining surface P1).
[0027]
As shown in FIG. 3, in the case of a single segment structure, two plates 38, 38 ′ can be provided at both ends of the upper element 31. In the case of a two-segment structure, each upper element 64, 64 'can be provided with a holding plate 38 only on the outside supported by the side walls 65, 65'. The inner ends of the two elements 64, 64 ′ are supported symmetrically on the central side wall 63.
It should be noted that the prefab element described above has many advantages and can be applied to various situations other than those described above.
For example, the use of reinforced side walls eliminates the need to implement the fill in a particular manner and can be reopened if necessary. Therefore, the pipe 67 can be passed through the embankment even after the construction of the structure.
The above advantages are particularly useful in urban areas because free space can be left on both sides of the structure. This side wall is constructed at the bottom of the trench and can also be used advantageously for structures covered with embankments.
[0028]
However, in the case of the structure to be constructed on the asymmetric land shown in FIG. 6, the embankment portion between the ascending side wall 65 and the slope 16 can be designed to absorb the lateral force. Therefore, the side wall 65 can be designed without a rib like the side wall 2 of the structure 2.
FIG. 7 shows another embodiment of a structure having two roads, where the exit passes obliquely through natural land with an inclined exit. In this case, it is preferable that the structure segment S′2 on the down slope side is stopped first, the segment S′1 located on the up slope side is extended, and only the segment S′1 is covered with the embankment 51 ′. The embankment 51 ′ is preferably stopped by an inclined plate 38 ′ provided on the downward slope side of the upper element 66. The upper element 66 is supported by the central side wall 63 ′. The side wall is composed of a row of columns with a hard wall or beam attached to the upper part, and a single contact portion 36 for the upper element 66 covering the segment S′1 can be formed on the upward slope side. On the downward slope side, the upper part of the central element 63 ′ constitutes an inclined surface 39a, and this inclined surface supports the holding plate 38a.
[0029]
Further, an inclined surface 39 ′ can be provided at the upper end of the rib 37 of each side wall 65 ′ that closes the segment S′2 facing outward. This inclined surface 39 'is oriented in the same direction as the plate 38' belonging to the upper element 64 '. Therefore, the lower portion 52 of the second bank 5 constituting the supporting surface of the plate 38' is omitted, and the upper portion 51 is stopped by the plate 38 '. It should be noted that it may be.
If the structure is simply covered with a soil cap, the ribbed side wall 65 'is only visible from the outside, sound insulation is ensured, and an aesthetic effect can also be achieved.
[0030]
For structures built in trenches and entirely covered with embankments, it is advantageous to use ribbed sidewalls at the exit of the structure when digging diagonally with respect to the embankment covering the structures.
FIG. 8 and FIG. 9 show an example, and show the exit of the structure that intersects the embankment E that supports the road 14. The longitudinal direction of the road 14 forms an angle other than a right angle with respect to the axis 70 of the structure 7.
This structure is composed of a series of segments, similar to the structure 2 of FIG. 2, each segment comprising two side walls 22, 22 'and an upper element 21 supported thereon. This side wall is supported in the lateral direction by the embankment E covering the structure, but both sides of the embankment E (not shown in FIG. 9) form an inclined surface E ′. It is divided along. In general, at the exit 7 of the structure, the side walls 72, 72 'of the last segment 71 are extended by a prefabricated wall 73 having the same slope as the slope to maintain the land.
[0031]
In particular, it can be seen that the side wall 72a on the side closest to the lower part of the slope cannot be supported on land with an insufficient height. In this case, in order to absorb the lateral force applied by the upper element 71, it is often necessary to extend the beam between the bases 73 and 73 'to join the two side walls. There are several problems with this. For example, there is a problem in constructing a road through the structure 7, which can be solved by using ribbed sidewalls of the above type at both ends of the structure 7 where the height of the embankment is insufficient. it can. The ribbed side wall itself absorbs loads applied to the fill without requiring any lateral support.
[0032]
As shown in FIG. 9, the side walls 72a, 72b adjacent to each other of the last two segments are provided with ribs 37, whereas on the opposite side, only the end side wall 72'a is ribbed. Side wall 72'b is the penultimate segment supported by a fill that is high enough to absorb thrust and is therefore the same as normal side wall 22 '.
[0033]
It is clear that the prefabricated element described above can be used in various ways. The present invention is not limited to the details of the above-described embodiments described by way of example, but can be modified and improved without departing from the definition of the scope of the claims and other uses are contemplated.
In particular, it is advantageous to use a wall element with a wide base for the construction of a structure, but a single floor having a very wide support surface by joining the bases of two side walls by a concrete floor. It is preferable to distribute the load on one base.
[0034]
Moreover, as already stated, in the aspect described in the above patent, the dimensions of the side walls are determined so as to have a predetermined flexibility so that the lateral direction is supported by the embankment, and the reinforcing bars are designed. In contrast, in the present invention, the total load applied is transmitted by the side wall at the base. As a result, the compressive stress applied to the concrete increases in the predetermined passing segment. Therefore, it is advantageous to manufacture each element from high performance concrete with substantially improved compressive strength so that it is not necessary to increase the thickness of the side walls (and thus the side wall weight).
Reference numerals inserted after the technical features described in the claims are intended to assist the understanding of the claims and do not limit the scope of the present invention.
[Brief description of the drawings]
FIG. 1 is a conceptual longitudinal cross-sectional view of a structure constructed in accordance with the present invention.
FIG. 2 is a cross-sectional view taken along line II-II in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is an overall conceptual perspective view.
FIG. 5 is a detailed view of the base of the side wall.
FIG. 6 is a design cross section of a structure having two segments aligned with each other.
FIG. 7 is a view showing a specific embodiment of the structure of the present invention.
FIG. 8 is a side view of an exit of a structure that passes through a slope obliquely.
FIG. 9 is a plan view of an exit of a structure passing obliquely through a slope.

Claims (12)

Forming a subsurface transport structures are at least partially covered by Sheng chloride, tubular structures that are durable by sequentially arranged one after the prefabricated wall element on the flat surface (A) to (D) And having at least three elements consisting of at least one upper element (31) and two side elements (32, 32 ′) in a cross section crossing the longitudinal axis (O) of the tubular structure (D), At least one inwardly curved upper element (31) is supported along the two longitudinal joints (36, 36 ') on the upper edges of the two side elements (32, 32') forming the side walls, The side elements (32, 32 ') have a base (33) supported by a flat surface (A) and a substantially vertical side wall (34), the upper part (35) of this side wall (34) being a tubular structure. Curved towards the longitudinal axis (O) and upper element (31) A continuous arch is formed which is joined tangentially to the corresponding side surface and transmits the load to the base (33, 33 ') of the side wall element (32, 32'), and each side wall element (32, 32 ') at least one reinforcing rib mounted on the outer surface of 34) (37), the reinforcing rib (37) extends to the height of the base (approximately longitudinal joint from 33) (36), a configuration creation object At least part characterized in that it has sufficient rigidity to absorb and transmit the load applied by the side wall elements (32, 32 ') to the base (33) without requiring lateral support by the embankment Underground traffic structure covered with embankment . The underground traffic structure according to claim 1, wherein each longitudinal joint (36, 36 ') between the side wall element (32) and the upper element (31) constitutes a joint having a longitudinal axis. The underground traffic structure according to claim 2, wherein each longitudinal joint (36) has a center in a joint surface (P1) inclined with respect to a vertical plane. A trench (B) is dug in the first part (11) lower than the height of the natural land (1), a flat surface (A) is formed on the bottom (11), and the flat surface (A) is exposed on the open surface. A first tubular structure (2) that can be assembled on-site with prefabricated wall elements, which is then covered with embankment (F) and is underground for building roads on uneven land The tubular structure (2) comprises at least one inwardly curved upper element (21) and two side elements (22, 22 ') in a cross section transverse to its longitudinal axis (O). Two side elements (22, 22 ') having at least three elements including, at least one inwardly curved upper element (21) forming side walls along two longitudinal joints (26, 26') Supported by the upper edge of each side element (22, 22 ') includes a base (23) supported on a flat surface (A) and a substantially vertical side wall (24), the upper part (25) of this side wall (24) pointing towards the longitudinal axis (O) of the structure. In an underground tubular structure that is curved and is joined tangentially to the corresponding side of the upper element (21) to form a continuous arch,
The trench (B) an outlet from the first tubular structure (2) and the same second structure type (3) the first tubular structure (2) is extended by the second structure (3) is Installed on the second part (2) of the flat surface (A) formed above the height of the natural land (1), that is, on the upper part (41) of the first embankment (4), the second structure (3 ), The entire structure (3) and the first embankment (4) supporting it are covered with the second embedding (5), and this embedding (5 ) On both sides of the structure to form natural hills (1) to form artificial hills, and each side wall element (31, 31 ') of the second structure (3) is attached to the outer surface of the side wall (34) At least one reinforcing rib (37) which extends from the base (33) to approximately the height of the longitudinal joint (36) to cover the structure. It is characterized by having sufficient rigidity to absorb the load applied to each side wall element (32, 32 ') and transmit it to the base (33) without the need for lateral support by the embankment (E). Underground tubular structure.   The width of the support surface (30) that supports the second structure (3) is determined based on the support force of the first embankment (4), and the load applied without excessive subsidence is transmitted to the embankment (4). The underground tubular structure according to claim 4. The structure is constructed on natural land (1) inclined in a direction crossing the longitudinal axis (O) of the structure (3) between the ascending slope side (16) and the descending slope side (15). A) has a part (18) formed asymmetrically and cut at the bottom of the trench (62) and a part (17) formed on the embankment (61) above the natural land (1), The side wall (65) of the object (3) faces the up-gradient side (16), and the side wall (65 ') of the structure faces the down-gradient side (15), and at least the down-gradient side wall (65') has a reinforcing rib The underground tubular structure according to claim 5, wherein (37) is formed. At least one end (33a, 33b) of at least some bases (33) of the side wall element (32) of the second structure (3) is provided with a stub reinforcing bar (42), and the stub reinforcing bar (42) The underground tubular structure according to claim 5 or 6, wherein concrete is poured after installation and embedded in the concrete to form an extension (44) of the support surface (30). It includes a floor (43) extending between the bases (33, 33 ') of the side wall elements (32, 32'), which is fixed to the inner end (33b) of the base (33, 33 ') The underground tubular structure according to claim 7, which forms a support surface (30) of the structure (3). Rigid plates each upper element (31) extending from the ends along at least one end toward the outer side upwards (38), the rigid plate (38) fill that covers the structure at least partially (5 9. An underground tubular structure according to any one of claims 1 to 8 for maintaining an upper part (51) having a minimum thickness of. The rigid plate (38) attached to one end of the upper element (31) is on a support surface (39) in the same direction provided at the upper end of each reinforcing rib (37) of the corresponding side wall element. Underground tubular structure. 11. An underground tubular structure according to claim 9 or 10, wherein the embedding partly covering the structure is stopped at the height of the rigid plate (38) and the ribbed sidewall element (65 ') is visible from the outside. It has at least two segments (S1, S2) joined to both sides of at least one central side wall (63), each segment having an upper element (64), one end of the upper element (64) having a central side wall ( 63), the other end is an underground structure supported by the side wall (65), and is an exit of land whose surface is inclined with respect to the longitudinal direction of the structure, and one segment located on the uphill side ( S′1) is extended with respect to the other segment (S′2) and is covered by an upper element (66), which has a rigid plate (38a), which has a central side wall (38a) 63 ') extends upwards on the side supported by the embankment and maintains the embankment (51') up to the height of the central side wall (63 '). The upper part of the central side wall (63') A support part (36) is formed, and the embankment (51 ') is maintained on the down slope side. Plates (38a) Underground tubular structure according to claim 9 or 10 to form an inclined surface for supporting (39a) and.

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