JP2019015065A - Hollow structure and its embedding method - Google Patents

Abstract

To ensure that a non-frost-heaving layer remains and prevents frost heaving effectively by covering an upper surface of the non-frost-heaving layer formed on an upper surface of a structure main body with a slidable cover member and sliding the cover member so that at least a part of the upper surface of the non-frost-heaving layer is opened.SOLUTION: The present invention comprises a hollow structure body 11 that can be embedded in the ground, a non-frost-heaving layer formed on an upper surface of the structure body 11, and a slidable cover member that covers an upper surface of the non-frost-heaving layer. As the cover member slides, at least a part of the upper surface of the non-frost-heaving layer is opened.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a hollow structure and a method for embedding the hollow structure.

  Conventionally, by embedding hollow structures such as box culverts in embankments and ground constructed to pass railroad tracks, that is, tracks and roads higher than the ground, underground A technique for forming a passage is employed. The hollow structure is often embedded by a non-cutting propulsion method.

  However, if a hollow structure such as a box culvert is buried in the embankment or ground in a cold region, frost heaving is likely to occur in winter due to cooling from the buried hollow structure. When frost heave occurs, the track or road above the hollow structure is lifted, and safety is impaired.

  Therefore, a technology has been proposed in which a concave portion is formed on the upper surface of the upper plate of the hollow structure, and a non-freezing material is placed in the concave portion to prevent frosting above the hollow structure (for example, (See Patent Document 1).

JP 2007-247396 A

  However, in the conventional hollow structure, since the upper surface of the recess in which the non-freezing material is placed is opened, the hollow structure is advanced while excavating the ground when buried by the non-cutting propulsion method. As a result, most of the non-freezing material falls outside the recess, and the amount of non-freezing material remaining in the recessed portion of the hollow underground structure that has been buried is reduced. Inflow volume may increase. Therefore, frost heave cannot be effectively prevented. Moreover, there is a possibility that deformation of the track on the upper surface of the embankment and the road surface may occur.

  However, a method has also been proposed in which a plurality of metal strips are arranged to cover the upper surface of the concave portion on which the non-freezing material is placed. However, in this case, because the gap between adjacent strips is narrow, the area where the non-freezing material comes into contact with the ground is small, and proper drainage is not possible, and high water content is prevented, effectively preventing freezing. Can not do it.

  Here, the problems of the prior art are solved, the upper surface of the non-freezing upper layer formed on the upper surface of the structure body is covered with a slidable cover member, and the cover member is slid to thereby slide the non-freezing upper layer. An object of the present invention is to provide a hollow structure and a method for embedding the structure, in which at least a part of the upper surface is opened so that a non-freezing upper layer can reliably remain and frosting can be effectively prevented.

  Therefore, in the hollow structure, a hollow structure main body that can be embedded in the ground, a non-freezing upper layer formed on the upper surface of the structure main body, and a slidable cover member that covers the upper surface of the non-freezing upper layer When the cover member slides, at least a part of the upper surface of the non-freezing upper layer is opened.

  In another hollow structure, the cover member is slid after being embedded in the ground together with the structure body and the non-freezing upper layer.

  In still another hollow structure, the non-freezing top layer is a laminate of a heat insulating material and a non-freezing top material.

  In still another hollow structure, the structure body further includes a recess formed on the upper plate, the non-freezing upper layer is accommodated in the recess, and the cover member is non-freezing in the recess. The upper layer is slidably mounted on the upper surface of the structure main body in which the upper layer is accommodated.

  In still another hollow structure, the cover member further includes an auxiliary member protruding from the end portion, and is slid by being pulled through a pulling member connected to the auxiliary member.

  In still another hollow structure, a plurality of the cover members can be connected in the sliding direction.

  In still another hollow structure, a hollow water collecting portion is formed in the upper plate of the structure main body, an inclination is given to the bottom surface of the concave portion, and the water collecting portion is formed on the bottom surface. A drainage channel having an opening at the lowest position and having a lower end exposed in the space of the structure main body is connected to the water collecting portion.

  In still another hollow structure, the cover member is further slidably supported by a support member placed on the upper surface of the structure body in which the non-freezing upper layer is accommodated in the recess, and the cover member and Each of the support members includes an opening, and the cover member is slidable so that the cover member and the opening of the support member are in an overlapping state from a non-overlapping state.

  In the method of embedding a hollow structure, a hollow structure body comprising a hollow structure body, a non-freezing upper layer formed on the upper surface of the structure body, and a slidable cover member covering the upper surface of the non-freezing upper layer is provided. A step of embedding in the ground by a non-cutting propulsion method and a step of sliding the cover member to open at least a part of the upper surface of the non-freezing upper layer.

  According to the present disclosure, the upper surface of the non-freezing upper layer formed on the upper surface of the structure body is covered with the slidable cover member, and at least a part of the upper surface of the non-freezing upper layer is opened by sliding the cover member. . Thereby, a non-freezing top layer remains reliably and freezing can be prevented effectively.

It is a perspective view of the structure main body in 1st Embodiment. It is a perspective view of the structure main body in which the non-freezing upper layer in 1st Embodiment was formed. It is a schematic diagram of the non-freezing upper layer in the first embodiment. It is a figure which shows the structure main body by which the cover member in 1st Embodiment was mounted. It is a perspective view of the modification of the cover member in 1st Embodiment. It is a schematic underground sectional drawing which shows the embedding method of the hollow underground structure in 1st Embodiment. It is a figure which shows the structure of the drainage mechanism in 2nd Embodiment. It is a figure which shows the structure of the drainage mechanism in 3rd Embodiment. It is a perspective view which shows the cover member in 4th Embodiment.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a structure main body according to the first embodiment, FIG. 2 is a perspective view of the structure main body formed with a non-freezing upper layer according to the first embodiment, and FIG. 3 is a first embodiment. FIG. 4 is a diagram showing a structure main body on which the cover member according to the first embodiment is placed, and FIG. 5 is a perspective view of a modification of the cover member according to the first embodiment. It is. 3A is a diagram showing a non-freezing material, FIG. 3B is a diagram showing a heat insulating material, and FIG. 3C is a diagram showing a configuration of a non-freezing layer. In FIG. FIG. 5 is a perspective view, FIG. 5B is a side view, and FIGS. 5A to 5D are views showing modifications of the cover member.

  In the figure, reference numeral 10 denotes a hollow structure according to the present embodiment, which includes a structure main body 11 and a slide plate 15 that functions as a cover member slidably mounted on the upper surface of the structure main body 11. The structure body 11 is preferably a rectangular parallelepiped hollow box-shaped member made of reinforced concrete. The structure body 11 includes a flat upper plate 11a, a flat lower plate 11b parallel to the upper plate 11a, and both ends in the width direction (Y-axis direction) of the upper plate 11a and the lower plate 11b. A pair of flat side plates 11s that are connected and extend in the vertical direction (Z-axis direction). A space 12 having a substantially rectangular cross-sectional shape extending in the front-rear direction (X-axis direction) defined by the upper plate 11a, the lower plate 11b, and the side plate 11s is formed at the center of the structure body 11. Has been. The space 12 is a through hole that opens on the front surface 11f and the rear surface 11r of the structure body 11.

  The structure main body 11 is a member similar to an underground structure generally called a box culvert, and is embedded in the embankment or ground by a non-cutting propulsion method, and the space portion 12 functions as an underground passage. To do. Further, the slide plate 15 is placed on the upper surface of the structure main body 11 and buried in the ground, for example, in the embankment or the ground together with the structure main body 11, and then pulled out and removed. The embankment or ground may be in any terrain, but for the sake of explanation, the embankment or ground is described here as being a railway track, i.e., embankment or ground constructed to pass a track or road. . And the said space part 12 shall be used as an underground passage which passes under the said track | orbit or a road.

  In the present embodiment, the expressions indicating directions such as upper, lower, left, right, front, rear, etc. used for explaining the configuration and operation of each part of the hollow structure 10 and other members are absolutely It is relative and not relative, and is appropriate when each part of the hollow structure 10 and other members are in the posture shown in the figure, but when the posture changes, the posture changes. It should be interpreted accordingly.

  As described in the “Background Technology” section, in the cold district, when the structure main body 11 is embedded in the embankment or ground to form an underground passage composed of the space portion 12, the cold air entering the underground passage in the winter season. As a result, the earth and sand on the upper plate 11a are cooled to cause frost heaving, and the upper track or road may be lifted.

  Therefore, the structure main body 11 in the present embodiment includes a recess 13 as a non-freezing upper layer accommodation space formed on the upper plate 11 a, so that the non-freezing upper layer 21 can be accommodated in the recess 13. It has become. Specifically, a peripheral wall 14 protruding upward from the upper surface of the upper plate 11 a is formed, and a space defined by the peripheral wall 14 is the concave portion 13. The peripheral wall 14 has a rectangular prismatic shape in plan view (viewed from the Z-axis direction), and the outer surfaces of the four walls are the outer surface of the side plate 11s and the front surface 11f and the rear surface 11r of the structure body 11. It is almost the same. Further, the recess 13 is a recess having a depth of 14d in which the upper side is opened and the upper surface of the upper plate 11a is a bottom surface 13a, and can accommodate the non-freezing upper layer 21 as shown in FIG. ing. The upper surface of the peripheral wall 14 is also the upper surface of the structure body 11 and is preferably a flat surface.

  As shown in FIG. 3, the non-freezing upper layer 21 includes a flat plate-like heat insulating material 21b and a non-freezing upper material 21a placed on the heat insulating material 21b. As shown in FIG. 3B, the heat insulating material 21b is a plate material having a thickness 22b made of, for example, urethane, polystyrene, EPS (Expanded Poly-Styrene), or the like, for example, about 3 to 5 [cm]. is there. In addition, as shown in FIG. 3A, the non-freezing material 21a is made of, for example, particle size-adjusted crushed stone, cut crushed stone, sandy soil, cement improved soil, etc., and the thickness 22a is, for example, 30 to 30 It is formed to be a layer of about 50 [cm]. As shown in FIG. 3C, the heat insulating material 21b and the non-freezing material 21a are laminated in such a state that the total thickness 22 is the same as the depth 14d of the recess 13. The upper layer 21 is accommodated in the recess 13. In addition, as the said non-freezing top layer 21, as FIG.3 (c) shows, what laminated | stacked the heat insulating material 21b and the non-freezing top material 21a can also be used.

  As shown in FIG. 4, in the present embodiment, the slide plate 15 is slidably mounted on the upper surface of the structure body 11 in which the non-freezing upper layer 21 is accommodated in the recess 13. The slide plate 15 is a substantially rectangular flat plate-shaped member having a size capable of covering at least the entire upper surface of the structure main body 11, and preferably has a dimension in the X direction as shown in FIG. Is larger than the dimension of the structure body 11 in the X direction, and protrudes rearward (X-axis negative direction) from the rear surface 11r of the structure body 11 when the structure body 11 is placed so as to cover the entire upper surface of the structure body 11. ing. The slide plate 15 is a plate material made of, for example, reinforced concrete, steel, and the like, and when the slide plate 15 is placed on the top surface of the structure main body 11 and embedded in the embankment or ground together with the structure main body 11. It has such a rigidity that it will not be deformed even if it receives a load from it, and has a strength that will not break when it is pulled out from the upper surface of the structure body 11. In addition, it is desirable to perform friction reduction processing, such as fluororesin coating formation, on both the upper and lower surfaces of the slide plate 15.

  Further, as shown in FIG. 5, the slide plate 15 may have a configuration for easily performing the pulling operation. As described above, the slide plate 15 is a member that is pulled out and removed after being embedded in the embankment or ground together with the structure body 11 in a state of being placed on the upper surface of the structure body 11. It is desirable to provide a configuration for easily performing the drawing operation.

  In the example shown in FIG. 5A, a pair of rod-like auxiliary members 16 made of, for example, steel or the like extending in the front-rear direction (X-axis direction) are embedded in the slide plate 15. The rear ends of the auxiliary members 16 protruding rearward from the rear end are connected to each other by a connecting member 16a. And the hook 31a connected to the front-end | tip of the member 31 for pulling which consists of wire rope etc. is hooked and connected with this connection member 16a, for example. As a result, the traction member 31 can be pulled by, for example, a heavy machine or other device, and the slide plate 15 can be moved backward to be pulled out.

  In the example shown in FIG. 5B, the tip of a steel bar 32 as a pulling member is connected to the connecting member 16a by means such as welding. Thereby, the said steel bar 32 can be pulled, for example with a heavy machine or another apparatus, and the slide board 15 can be moved back, and can be pulled out.

  In the example shown in FIG. 5C, the connecting member 16a that connects the rear ends of the protruding auxiliary members 16 does not exist. Therefore, the slide plate 15 can be moved backward and pulled out by directly connecting the rear end of each auxiliary member 16 to a pulling member of a heavy machine or other device.

  The slide plate 15 may be composed of a plurality of sections, and the sections may be connected to each other. In the example shown in FIG. 5D, the slide plate 15 includes a first cover member section 15-1 and a second cover member section 15-2, and the auxiliary member 16 included in the first cover member section 15-1 is provided. The protruding rear end is connected to the sleeve portion 17 connected to the front end of the auxiliary member 16 provided in the second cover member section 15-2, so that the first cover member section 15-1 and the second cover member section 15 are connected. -2 are connected to each other. The slide plate 15 may be composed of three or more sections.

  Next, a method for embedding the hollow structure 10 having the above-described configuration will be described. Here, a method of embedding by a so-called non-cutting propulsion method will be described.

  FIG. 6 is a schematic underground sectional view showing a method for burying a hollow underground structure in the first embodiment. In addition, in the figure, (a)-(c) is a figure which shows each process.

  First, as shown in FIG. 6 (a), after excavating the starting resisting 52a and the reaching resisting 52b on the ground 51 on both the left and right sides of the track 54, the straight base plate 51a positioned immediately below the track 54 is made of, for example, steel. A roof 55 is formed by press-fitting a plurality of square pipes or the like made in the horizontal direction. The roof 55 is formed immediately below the track 54 so as to start from the start resistance 52a and reach the arrival resistance 52b. Subsequently, the structure main body 11 is disposed in the start stand 52a, and the vicinity of the upper end of the front surface 11f of the structure main body 11 is brought into contact with the end of the roof 55 on the start stand 52a side, that is, the rear end. . Then, the structure main body 11 is propelled by operating the hydraulic jack 57 received through the support plate 52c on the anti-wall of the start-up resistance 52a and extending the piston rod, thereby reaching the ultimate resistance 52b. Displace toward. A blade edge 58 is attached to the front surface 11 f of the structure body 11. Further, a non-freezing upper layer 21 is accommodated in the recess 13 of the structure body 11, and the upper surface thereof is covered with a slide plate 15 placed on the upper surface of the structure body 11.

  Thereby, the structure main body 11 is propelled while excavating the direct base board 51a by the blade 58. Moreover, the roof 55 is pushed by the structure main body 11, and the front end protrudes in the reaching resistance 52b. Then, when the protruding amount of the roof 55 in the reaching resistance 52b becomes large, the protruding portion of the roof 55 is appropriately cut off. Note that, as shown in FIG. 6A, a temporary support base 53 can be provided in the reaching resistance 52b as necessary. In addition, a spacer 56 can be interposed between the anti-wall support plate 52c and the hydraulic jack 57 in the start stand 52a. The number of the spacers 56 can be increased in accordance with the advanced state of the structure body 11. Furthermore, when the dimension of the structure main body 11 in the front-rear direction is shorter than the distance from the start standing resistance 52a to the arrival standing resistance 52b, the plurality of structure main bodies 11 can be connected in the front-rear direction. In this case, by making the slide plates 15 connectable as in the example shown in FIG. 5D, all the slide plates 15 placed on the upper surfaces of all the structure bodies 11 are mutually connected. Can be integrated with each other.

  Then, as shown in FIG. 6B, when the structure body 11 is embedded in the direct base 51a, the vicinity of the rear end of the slide plate 15 located behind the rear surface 11r of the structure body 11 is In this state, it protrudes into the start-up resistance 52a. In the example shown in the figure, two structure bodies 11 are connected in the front-rear direction and embedded in the direct base board 51a. Two slide plates 15 placed on the upper surfaces of the two structure bodies 11 are also connected and integrated. Further, the roof 55 is discharged from the direct base board 51a and protrudes into the reaching resistance 52b. Subsequently, the spacer 56 is removed from the start stand 52a, and the temporary support 53 and the roof 55 are removed from the reach stand 52b.

  Then, as shown in FIG. 6 (c), the backhoe 61, which is a heavy machine, is thrown into the start-up resistance 52 a, and a hook 62 a as a traction member attached to the tip of the hydraulic arm 62 is attached to the slide plate 15. The auxiliary member 16 protruding from the rear end is hooked and connected. Subsequently, by operating the hydraulic arm 62 of the backhoe 61 and pulling the auxiliary member 16, the slide plate 15 can be moved rearward and pulled out from the direct base board 51 a. Then, since the non-freezing upper layer 21 accommodated in the concave portion 13 of the structure body 11 is interposed between the upper plate 11a of the structure body 11 and the earth and sand of the direct base board 51a thereabove, the earth and sand Is not cooled by the cold air entering the underground passage composed of the space 12 even in winter. Therefore, no freezing occurs on the direct base board 51a above the structure main body 11 and the track 54 is not lifted, so that the train 65 is safely on the track 54 as shown in FIG. Can drive.

  Thus, the hollow structure 10 according to the present embodiment includes a hollow structure body 11 that can be embedded in the ground, a non-freezing upper layer 21 formed on the upper surface of the structure body 11, and a non-freezing upper layer 21. The slidable slide plate 15 covering the upper surface is provided, and at least a part of the upper surface of the non-freezing upper layer 21 is opened by the slide plate 15 sliding. The slide plate 15 is slid after being embedded in the ground together with the structure main body 11 and the non-freezing upper layer 21. The hollow structure 10 is embedded in a hollow structure main body 11, a non-freezing upper layer 21 formed on the upper surface of the structure main body 11, and a slidable slide plate 15 that covers the upper surface of the non-freezing upper layer 21. Embedded in the ground by a non-cutting propulsion method, and a step of sliding the slide plate 15 to open at least a part of the upper surface of the non-freezing upper layer 21.

  Thereby, even if it is buried in the ground, the non-freezing upper layer 21 reliably remains on the upper surface of the structure main body 11, so that frosting can be effectively prevented.

  Further, the non-freezing upper layer 21 can increase the effect of preventing the frosting by stacking the heat insulating material 21b and the non-freezing material 21a.

  Further, the structure main body 11 includes a recess 13 formed on the upper plate 11 a, the non-freezing upper layer 21 is accommodated in the recess 13, and the slide plate 15 has a structure in which the non-freezing upper layer 21 is accommodated in the recess 13. The object body 11 is slidably mounted on the upper surface. Therefore, even if the hollow structure 10 is embedded in the ground by the non-cutting propulsion method, the non-freezing upper layer 21 reliably remains on the upper surface of the structure body 11.

  Further, the slide plate 15 includes an auxiliary member 16 protruding from the rear end, and is slid by being pulled through a pulling member 31 connected to the auxiliary member 16. A plurality of slide plates 15 can be connected in the slide direction. Therefore, the slide plate 15 can be easily slid.

  Next, a second embodiment will be described. In addition, about what has the same structure as the said 1st Embodiment, the description is abbreviate | omitted by providing the same code | symbol. The description of the same operation and the same effect as those of the first embodiment is also omitted.

  FIG. 7 is a view showing the structure of the drainage mechanism in the second embodiment. In addition, in the figure, (a) is a top view, (b) is an AA arrow sectional view in (a), (c) is an AA arrow partial sectional view in (a) showing a modification. .

  The structure main body 11 in the present embodiment includes a drainage mechanism for quickly draining water that has entered the recess 13. First, the bottom surface 13a of the recess 13 is inclined. Specifically, as indicated by an arrow C in FIG. 7A, the level decreases from the center in the front-rear direction (X-axis direction) of the bottom surface 13a to both sides in the front-rear direction, and in FIG. As shown by the arrow D, the inclination is given so that it may become so low that it goes to the width direction both sides from the center of the width direction (Y-axis direction) of the bottom face 13a. Therefore, the four corners of the bottom surface 13a are the lowest, and the moisture that has entered the recess 13 flows toward the four corners of the bottom surface 13a.

  Then, hollow water collecting portions 33 are formed at the four corners in the upper plate 11 a of the structure body 11. The upper end of the water collecting portion 33 is open to the bottom surface 13a, and a drainage channel 34 is connected to the lower end. In addition, it is desirable that a porous member such as a wire mesh is disposed in the opening of the water collecting portion 33 in order to prevent solids from entering. The drainage channel 34 is an elongated cavity formed in the side plate 11 s of the structure main body 11 and extending in a generally vertical direction, and a lower end thereof is exposed in the space portion 12. As shown in FIG. 7B, when the lower end of the drainage channel 34 is exposed in the space 12 at a relatively high position, a pipe-shaped auxiliary drainage channel 34a made of resin or the like is formed at the lower end. It is desirable to connect. Further, as shown in FIG. 7C, when the lower end of the drainage channel 34 is exposed in the space 12 at a relatively low position, the auxiliary drainage channel 34a is not connected to the lower end. Good.

  Since the configuration of other points is the same as that of the first embodiment, description thereof is omitted. Further, since the operations and effects of other points are the same as those in the first embodiment, description thereof is omitted.

  Thus, in the present embodiment, the hollow water collecting portion 33 is formed in the upper plate 11a of the structure body 11, and the bottom surface 13a of the concave portion 13 is inclined, so that the water collecting portion 33 is A drainage channel 34 that opens to the lowest position on the bottom surface 13 a and that has a lower end exposed in the space 12 of the structure body 11 is connected to the water collecting portion 33. Therefore, the water that has entered the recess 13 can be quickly and reliably drained, and the function of preventing the non-freezing upper layer 21 from freezing is not impaired.

  Next, a third embodiment will be described. In addition, about the thing which has the same structure as the said 1st and 2nd embodiment, the description is abbreviate | omitted by providing the same code | symbol. Also, the description of the same operations and effects as those of the first and second embodiments is omitted.

  FIG. 8 is a view showing the structure of the drainage mechanism in the third embodiment. In the drawings, (a) is a top view, (b) is a cross-sectional view taken along the line BB in (a), and (c) is a cross-sectional view taken along the line BB in (a) showing a modification.

  Similarly to the second embodiment, the structure main body 11 in the present embodiment also includes a drainage mechanism for quickly draining water that has entered the recesses 13. In the present embodiment, FIG. As indicated by an arrow E in (a), the width of the bottom surface 13a becomes lower as it goes from the front / rear center of the bottom surface 13a to both sides in the front / rear direction and as indicated by an arrow F in FIG. 8 (a). The inclination is given so that it may become so low that it goes to the center of the width direction from the direction both ends. Accordingly, both ends in the front-rear direction at the center in the width direction of the bottom surface 13a are the lowest, and moisture that has entered the recess 13 flows toward both ends in the front-rear direction at the center in the width direction of the bottom surface 13a.

  A hollow water collecting portion 33 is formed at both ends in the front-rear direction at the center in the width direction in the upper plate 11 a of the structure body 11. The upper end of the water collecting portion 33 is open to the bottom surface 13a, and a drainage channel 34 is connected to the lower end. The drainage channel 34 is an elongated cavity formed in the upper plate 11 a and extending in a generally vertical direction, and a lower end thereof is exposed in the space portion 12. The lower end of the drainage channel 34 may be exposed near the center in the width direction of the upper plate 11a as shown in FIG. 8B, or the upper plate 11a as shown in FIG. 8C. You may expose in the width direction edge part vicinity. And it is desirable to connect the pipe-shaped auxiliary drainage channel 34a which consists of resin etc. to the said lower end.

  Since the configuration of other points is the same as that of the first and second embodiments, the description thereof is omitted. In addition, since the operations and effects of other points are the same as those in the first and second embodiments, description thereof will be omitted.

  Next, a fourth embodiment will be described. In addition, about the thing which has the same structure as the said 1st-3rd embodiment, the description is abbreviate | omitted by providing the same code | symbol. Explanation of the same operations and effects as those of the first to third embodiments is also omitted.

  FIG. 9 is a perspective view showing a cover member in the fourth embodiment. In the figure, (a) is a diagram showing the first state, (b) is a diagram showing the second state, and (c) is a diagram showing the inner part.

  The slide plate 15 in the present embodiment has an outer portion 15a and an inner portion 15b that is slidably accommodated in the outer portion 15a. The inner portion 15b functions as a cover member, and the outer portion 15a functions as a support member that slidably supports the cover member.

  The inner portion 15b is a plate material made of, for example, reinforced concrete, steel, or the like, and as shown in FIG. 9C, an inner slit 18b that is a plurality of slit-shaped openings is formed. The inner slit 18b is a through hole that penetrates the inner portion 15b in the plate thickness direction (Z-axis direction).

  Further, the outer portion 15a is made of, for example, reinforced concrete, steel, etc., and is thicker than the inner portion 15b, and can accommodate the inner portion 15b as shown in FIG. 9A. A recess 15c is provided. The inner portion 15b is accommodated in the accommodating recess 15c so as to be slidable in the front-rear direction (X-axis direction). Furthermore, the outer part 15a is formed with an outer slit 18a which is a plurality of slit-shaped openings. The outer slit 18a is a through hole that penetrates the outer portion 15a in the thickness direction (Z-axis direction).

  When the slide plate 15 is in the first state, as shown in FIG. 9A, the entire inner portion 15b is accommodated in the accommodating recess 15c, and the outer slit 18a and the inner slit 18b are There is no overlap at all. Therefore, when the slide plate 15 in the first state is placed on the upper surface of the structure body 11 in which the non-freezing upper layer 21 is accommodated in the recess 13, the upper portion of the non-freezing upper layer 21 is covered with no gap. Become.

  Subsequently, from this state, when the inner portion 15b is pulled backward (X-axis negative direction) and slid with respect to the outer portion 15a, the slide plate 15 is in the second state as shown in FIG. 9B. become. In this state, since the outer slit 18a and the inner slit 18b completely overlap, the non-freezing upper layer 21 is in communication with the upper surface of the slide plate 15 through the outer slit 18a and the inner slit 18b which are openings. Therefore, after the slide plate 15 in the first state is placed on the upper surface of the structure main body 11 in which the non-freezing upper layer 21 is accommodated in the recess 13 and embedded in the embankment or ground together with the structure main body 11. When the inner portion 15b is slid to the second state, the non-frozen upper layer 21 comes into contact with the embankment or the earth and sand, and appropriately treats (drainage) without retaining water such as rain coming from the upper part of the embankment. And freezing factor can be removed.

  The total area of all outer slits 18a and the total area of all inner slits 18b are preferably 10 to 50% of the area of outer part 15a and the area of inner part 15b, respectively. It can be changed as appropriate.

  Other configurations are the same as those in the first to third embodiments, and the description thereof is omitted. Furthermore, since the operations and effects of other points are the same as those in the first to third embodiments, the description thereof is omitted.

  Thus, in the present embodiment, the inner portion 15b is slidably supported by the outer portion 15a placed on the upper surface of the structure body 11 in which the non-freezing upper layer 21 is accommodated in the recess 13, and the inner portion 15b and the outer portion 15a include an inner slit 18b and an outer slit 18a, respectively, and the inner portion 15b is slidable so that the inner slit 18b and the outer slit 18a are in an overlapping state from a non-overlapping state. Therefore, even when buried in the ground, the inner portion 15b can be slid easily and smoothly, and the non-freezing upper layer 21 reliably remains on the upper surface of the structure body 11. Can be prevented.

  It should be noted that the disclosure of the present specification describes features related to preferred and exemplary embodiments. Various other embodiments, modifications and variations within the scope and spirit of the claims attached hereto can naturally be conceived by those skilled in the art by reviewing the disclosure of this specification. is there.

  This indication is applicable to a hollow structure and its embedding method.

DESCRIPTION OF SYMBOLS 10 Hollow structure 11 Structure main body 11a Top plate 12 Space part 13 Recessed part 13a Bottom face 15 Slide board 16 Auxiliary member 21 Non-freezing upper layer 21a Non-freezing upper material 21b Heat insulating material 31 Towing member 32 Steel bar 33 Water collecting part 34 Drainage channel

Claims (9)

A hollow structure body that can be embedded in the ground;
A non-freezing upper layer formed on the upper surface of the structure body;
A slidable cover member covering the upper surface of the non-freezing upper layer,
A hollow structure in which at least a part of the upper surface of the non-freezing upper layer is opened by sliding the cover member.   The hollow structure according to claim 1, wherein the cover member is slid after being embedded in the ground together with the structure main body and the non-freezing upper layer.   The hollow structure according to claim 1 or 2, wherein the non-freezing top layer is a laminate of a heat insulating material and a non-freezing top material.   The structure body includes a recess formed on an upper plate, the non-freezing upper layer is accommodated in the recess, and the cover member is provided on an upper surface of the structure body in which the non-freezing upper layer is accommodated in the recess. The hollow structure according to any one of claims 1 to 3, which is slidably mounted.   The hollow structure according to claim 4, wherein the cover member includes an auxiliary member protruding from an end portion, and is slid by being pulled through a pulling member connected to the auxiliary member.   The hollow structure according to claim 4, wherein a plurality of the cover members can be connected in the sliding direction.   A hollow water collecting portion is formed in the upper plate of the structure main body, an inclination is given to the bottom surface of the concave portion, and the water collecting portion opens at the lowest position on the bottom surface, and the water collecting portion The hollow structure of Claim 4 to which the drainage channel which a lower end exposes in the space part of the said structure main body is connected.   The cover member is slidably supported by a support member placed on an upper surface of a structure body in which a non-freezing upper layer is accommodated in the recess, and each of the cover member and the support member includes an opening, and the cover member The hollow structure according to claim 4, wherein the cover member and the support member are slidable so that the openings of the cover member and the support member are overlapped with each other. A hollow structure comprising a hollow structure body, a non-freezing upper layer formed on the upper surface of the structure body, and a slidable cover member covering the upper surface of the non-freezing upper layer is embedded in the ground by a non-cutting propulsion method. And a process of
And a step of sliding the cover member to open at least a part of the upper surface of the non-freezing upper layer.

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