Buried object installation method for roadway

Abstract

To provide a buried object installation method capable of installing a buried object in a properly protected state even on a road without a concrete floor slab in an area with heavy snowfall.SOLUTION: A construction method for installing a buried object in a road without a floor slab in an area with heavy snowfall comprises: an excavation step of excavating an asphalt layer 102 to expose a base course 104 or a roadbed 106; a trestle installation step of installing a trestle 12 on the base course 104 or the roadbed 106; a foundation formation step of placing concrete 50 in an excavated part; a temporary installation step of fixing a guide plate 16 and the buried object 10 to the trestle 12; and a concrete placing step of burying the trestle 12, the guide plate 16 and the buried object 10 with concrete 60.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a technique for installing buried objects, including measuring instruments such as sensors, in roadways, and in particular to a buried object installation method suitable for burying objects in roads that do not have a deck slab in the roadbed in areas with heavy snowfall. [Background technology]

[0002] In areas with heavy snowfall, the task of removing snow that has accumulated on roads is essential. However, when buried objects such as expansion joints that constitute concrete structures such as bridges are present on the road, the snow removal board (snow removal board) attached to the snow removal vehicle may get caught on the buried objects, damaging the expansion joint and the road surface, as well as the snow removal vehicle itself. For this reason, as disclosed in Patent Document 1, measures have been taken near such expansion joints to move the snow removal board upward so that it does not get caught on the expansion joint. Specifically, guide boards with inclined surfaces that guide the snow removal board are buried both near the upstream side and downstream side of the vehicle's traveling direction with the expansion joint as the base point.

[0003] By adopting this technology, it is possible to carry out snow removal work smoothly and also to prevent situations where buried objects are damaged as a result of snow removal work. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-160727 A Summary of the Invention [Problem to be solved by the invention]

[0005] The guide plate having the above-mentioned structure is fixed to the deck foundation via anchors, or directly welded to the expansion device and receives a reaction force from the concrete deck, so that it is possible to suppress the sinking of the guide plate itself due to the vehicle weight and to perform its function. However, in roads other than those built on concrete structures such as bridges, the asphalt foundation is often a roadbed made of gravel or the like. Therefore, even if anchors are driven in to support the guide plate, it may not be possible to obtain sufficient resistance to suppress sinking due to the load, and it may not be possible to perform the protective function for buried objects.

[0006] Therefore, the present invention aims to provide a buried object installation method that can install buried objects while properly protecting them, even in areas with heavy snowfall and on roads that do not have concrete decks. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the method for installing buried objects in roadways according to the present invention is a method for installing buried objects in roads that do not have a deck in areas with heavy snowfall, and is characterized by having an excavation process for excavating an asphalt layer to expose the roadbed or subgrade, a mount installation process for installing a mount on the roadbed or subgrade, a temporary installation process for fixing a guide plate and buried objects to the mount, and a concrete pouring process for pouring concrete into the excavated area formed by the excavation process to bury the mount, the guide plate, and the buried objects.

[0008] In addition, in the buried object installation method for roadways having the above-mentioned characteristics, it is preferable to have a foundation formation process for pouring concrete to fix the mount and function as an anchor after the frame installation process and before the temporary installation process. With such characteristics, the load can be received on the surface, sinking resistance can be obtained, and the mount can be stabilized. Therefore, even if the guide plate and buried object fixed in the temporary installation process are heavy, it is possible to install the buried object at the desired position on the road surface, and there is no problem such as misalignment.

[0009] In addition, in the buried object installation method for a roadway having the above-mentioned characteristics, a metal member can be attached to the buried object via a grout material, and in the temporary installation step, the guide plate can be fixed to the stand, and the buried object can be fixed to the guide plate directly or indirectly via the metal member. By having such characteristics, the buried object can be easily and reliably fixed, and the positional relationship between the buried object and the guide plate can be appropriately arranged.

[0010] In the method for installing buried objects in a roadway having the above-mentioned characteristics, the excavation step may be configured to drill a horizontal hole in the cross section of the asphalt layer located at the excavation site. With such a characteristic, the concrete poured in the excavation site in the concrete pouring step also flows into the drilled horizontal hole. Therefore, it is possible to prevent the concrete filling the excavation site from floating up from the asphalt layer around the concrete.

[0011] In the method for installing buried objects in a roadway having the above-mentioned characteristics, the step of installing the frame may include placing a reinforcing bar in the horizontal hole. By having such a characteristic, the effect of suppressing the lifting of concrete can be improved.

[0012] Furthermore, in the method for installing buried objects in a roadway having the above-mentioned characteristics, it is preferable to use ultra-fast hardening concrete as the concrete. With such characteristics, it is possible to significantly shorten the construction period and shorten the time that vehicles are closed to traffic due to construction. Effect of the Invention

[0013] According to the method for installing buried objects in roadways having the characteristics described above, buried objects can be installed in a properly protected state, even in areas with heavy snowfall and on roads that do not have concrete decks. [Brief description of the drawings]

[0014] [Figure 1] FIG. 13 is a diagram for explaining an excavation process in an embodiment of a method for installing a buried object in a roadway. [Diagram 2] FIG. 13 is a diagram for explaining a mounting base installation process in an embodiment of a method for installing a buried object in a roadway. [Diagram 3] FIG. 13 is a diagram for explaining a foundation formation process in an embodiment of a buried object installation method for a roadway. [Figure 4] FIG. 13 is a diagram for explaining the fixing of a guide plate in a temporary construction process in an embodiment of a buried object installation method for a roadway. [Diagram 5] 13 is a diagram for explaining the fixing of an auxiliary plate in a temporary construction step in an embodiment of a buried object installation method for a roadway. FIG. [Figure 6] FIG. 13 is a diagram for explaining the fixing of buried objects in a temporary installation process in an embodiment of a buried object installation method for a roadway. [Figure 7] FIG. 1 is a diagram for explaining a concrete pouring step in an embodiment of a method for installing a buried object in a roadway. [Figure 8] FIG. 2 is a perspective view for explaining one example of the configuration of a stand used in the embodiment. [Figure 9] FIG. 2 is a perspective view for explaining one example of the configuration of a guide plate used in the embodiment. [Figure 10] FIG. 11 is a longitudinal side view for explaining a state in which a guide plate, a reinforcing bar, and an auxiliary plate are fixed to a stand in an embodiment. [Figure 11] FIG. 2 is a cross-sectional view for explaining the structure of an embedded object according to the embodiment. [Figure 12] FIG. 2 is a diagram showing a side configuration of an embedded object according to the embodiment. [Figure 13] FIG. 13 is a diagram for explaining a first modified example regarding a construction method for installing buried objects in a roadway. [Figure 14] FIG. 13 is a diagram for explaining a second modified example regarding a construction method for installing buried objects in a roadway. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiment of the method for installing buried objects in a roadway of the present invention will be described in detail with reference to the drawings. Note that the embodiment shown below is a part of the preferred embodiment for carrying out the present invention, and even if the shape of the guide plate used in the method, the shape of the reinforcement, etc. are changed, they can be regarded as part of the present invention as long as the effect of the method is exhibited.

[0016] The buried object installation method for roadways according to the present invention (hereinafter simply referred to as the buried object installation method) is a method suitable for installing buried objects on roads other than elevated roads such as bridges, i.e., roads that do not have concrete decks, in areas with heavy snowfall. Note that in the following embodiment, an axle load sensor will be taken as an example of a buried object, but the buried object is not limited to this.

[0017] The buried object installation method according to this embodiment is based on an excavation process, a stand installation process, a foundation formation process, a temporary construction process, and a concrete pouring process. Each process will be described below in detail with reference to Figs. 1 to 7.

[0018] [Drilling process] As shown in FIG. 1, the excavation process is a process of peeling off the asphalt layer 102 in the road 100, exposing the roadbed 104 or roadbed 106, and forming an excavation area (the roadbed 104 is exposed in this embodiment). The roadbed 104 here refers to a consolidation layer that is located under the asphalt layer 102 that constitutes the road 100 and is composed of so-called gravel such as crushed stone. The roadbed 106 refers to a layer that is located below the roadbed 104 and serves as the foundation of the road. The excavation range in the excavation process is set to a range that allows the buried object 10 (see FIG. 6, FIG. 11, etc.) and the guide plate 16 (see FIG. 4, FIG. 9, etc.) to be placed and the installation work to be performed. By narrowing the excavation range as much as possible, it is possible to shorten the work time required for the excavation process, and also to shorten the work time required for the concrete pouring process, the details of which will be described later. Note that the examples shown in Figures 1 to 7 show a cross section of the road 100, with the depth direction in the figure corresponding to the width direction of the road 100. In this embodiment, excavation is carried out in units of lanes that make up the road 100 so as to have rectangular openings with their major axis in the width direction.

[0019] [Frame installation process] After the removal of the pavement (asphalt layer 102) is completed by the excavation process, the mount 12 is installed as shown in FIG. 2. The mount 12 is an element for supporting the guide plate 16 and the buried object 10 (in this embodiment, an object including the axle load sensor 10a (see FIG. 11)) as shown in FIG. 6, FIG. 7, etc. The form and configuration of the mount 12 are not limited, but as shown in the perspective view of FIG. 8, for example, the mount 12 is mainly composed of a plurality of main reinforcements 12a arranged along the long axis direction of the excavation opening (the longitudinal direction of the buried object 10) and a plurality of anchor reinforcements 12b arranged at a predetermined interval along the arrangement direction of the main reinforcements 12a. Here, the main reinforcements 12a are reinforcing bars for determining the position of the lower end of the mount 12 and the arrangement interval of the anchor reinforcements 12b, and the anchor reinforcements 12b are reinforcing bars that serve as anchors for fixing the guide plate 16, which will be described in detail later. For this reason, the anchor bars 12b are erected so that at least a part of them is exposed from the concrete 50 poured in the foundation forming process described later in detail. In the example shown in Fig. 8, foundation bars 12c are provided for the stability and positioning of the frame 12. In this embodiment, after the frame 12 is placed in the excavation area, the anchors 14 are driven into the roadbed 104 to position the frame.

[0020] [Foundation formation process] After placing the base 12 in the excavated area, concrete 50 is poured to fix the base 12 and function as an anchor (see FIG. 3). The pouring range of the concrete 50 in the foundation formation process (the depth to which the concrete 50 is poured) is not limited as long as it can fix the base 12 and function as an anchor. This is because there may be cases where the appropriate depth to which the concrete 50 is poured needs to be changed depending on the type of concrete, the scale of the excavated area, the size of the base 12, the time available for hardening, and the like.

[0021] As an example of the pouring range of the concrete 50 capable of fixing the base 12 and functioning as an anchor, the lower half or more of the excavated portion can be buried, and at least the upper end of the base 12 (specifically, the anchor bars 12b constituting the base 12) can be exposed. Note that the upper end needs to be exposed in order to fix the guide plate 16, the buried object 10, etc.

[0022] Here, it is advisable to use ultra-fast hardening concrete as the concrete 50 used for pouring. For ordinary concrete, it is said that it takes one week to harden until it reaches a practical level of strength (practical strength), and about four weeks to reach its maximum strength. Even for ordinary fast hardening concrete, it is said that it takes three days to reach practical strength and about one week to reach its maximum strength. In contrast, ultra-fast hardening concrete takes 1.5 hours to reach practical strength and three hours to reach its maximum strength. For this reason, by using ultra-fast hardening concrete as the concrete 50 used for pouring, the waiting time for hardening can be significantly shortened, and it is possible to shorten the construction period, improve workability, and reduce the time that vehicles are closed to traffic due to construction.

[0023] [Temporary construction process] After the base 12 is placed and fixed to the excavation site, the guide plate 16 and buried object 10 are fixed to the base 12. Here, the guide plate 16 used in this embodiment is basically composed of at least a lower side 16a, an upper side 16b, a first side 16c, a second side 16d, and an inclined side 16e, as shown in the perspective view of Fig. 9, and has an opening 16f formed in the center of the plate surface. By inserting a reinforcing bar 18 (see Fig. 5) into the opening 16f and fixing the reinforcing bar 18 to the guide plate 16, it becomes possible to prevent the guide plate 16 from shaking (positioning) and to fix an auxiliary plate (see Fig. 5).

[0024] In addition, the guide plate 16 shown in FIG. 9 has a notch on the lower side 16a to which the opening 16f is connected, but this notch is not necessarily required. As shown in FIG. 4, the guide plate 16 is arranged so that the inclined side 16e is located in a direction opposite to the vehicle travel direction. By arranging in this manner, when the snow removal plate of a snow removal vehicle (not shown) traveling in the vehicle travel direction contacts the inclined side 16e, it is possible to guide the snow removal plate (not shown) to the upper side 16b side, and damage to the buried object 10 and the snow removal plate due to being caught can be prevented. Here, even if the inclined side 16e is covered with concrete 60 as shown in FIG. 7, it will be exposed when the concrete 60 is worn away by the passage of the vehicle. The damage prevention function of the guide plate 16 described above is exerted when the inclined side 16e is exposed in this way.

[0025] The fixing of the guide plate 16 to the anchor bar 12b is not limited to any particular means as long as the means can firmly fix the two together. One example is welding.

[0026] Next, the buried object 10 is fixed to the guide plate 16 fixed to the stand 12. In this embodiment, the periphery of the axle load sensor 10a is covered with grout material 10b so that the axle load sensor 10a having a cross-sectional shape as shown in FIG. 11 has a rectangular cross section that is easy to support and fix. Here, a metal plate 10c (an L-shaped metal plate in the example shown in FIG. 11) is attached to the lower end corner of the grout material 10b. By attaching the metal plate 10c, welding can be used as a fixing means. When the sensors are covered with the grout material 10b, it is preferable that the grout material 10b does not cover the functional surface of the sensors.

[0027] The buried object 10 that has been pre-processed as described above may be fixed to the guide plate 16 by direct welding, but it is preferable to fix the guide plate 16 via an auxiliary plate 20 as shown in Figures 5 and 6. Specifically, an L-shaped metal plate is used as the auxiliary plate 20, and the auxiliary plate 20 is welded to the guide plate 16 and the reinforcing bar 18 that is inserted into and fixed to the opening 16f of the guide plate 16. Figure 10 shows the state in which the auxiliary plate 20 is welded to the guide plate 16, as viewed from the side along the longitudinal direction of the stand 12.

[0028] By using an L-shaped metal plate for the auxiliary plate 20, the plate surface arranged in the vertical direction plays the role of a rib, suppressing the deflection of the plate and stabilizing the support state of the buried object 10 (axle load sensor 10a). For this reason, when placing the auxiliary plate 20, a part of the auxiliary plate 20 is extended on the side where the buried object 10 is placed.

[0029] After the welding and fixing of the auxiliary plate 20 is completed, the buried object 10 is placed in the extended portion, and the metal plate 10c that has been attached in advance is welded to the auxiliary plate 20. At this time, it is advisable to adjust the fixing position of the auxiliary plate 20 and the thickness of the grout material 10b in the buried object 10 in advance so that the height of the upper surface of the buried object 10 and the upper side 16b of the guide plate 16 coincide with each other.

[0030] [Concrete pouring process] After the guide plate 16 and the buried object 10 are fixed to the stand 12, concrete 60 is poured so as to bury the guide plate 16 and the buried object 10 in the excavated area (see FIG. 7). The concrete 60 is poured so that the top surface of the concrete 60 is at the same height as the top surface of the asphalt layer 102 that constitutes the paved road. By making the height of the joint between the asphalt layer 102 and the concrete 60 the same, it is possible to reduce the vibration received by vehicles traveling on the road and the noise generated during traveling. The concrete 60 used for pouring should preferably be ultra-fast hardening concrete, as with the concrete 50 used in the foundation formation process. If the concrete 60 is covered on the top surface of the buried object 10 and the guide plate 16, it is preferable to chip the concrete surface so that the surface of the axle load sensor 10a is exposed on the surface of the concrete 60 after the poured concrete 60 hardens to the surface of the road.

[0031] [effect] According to the buried object installation method described above, buried objects can be installed in a properly protected state even on roads that do not have concrete decks in areas with heavy snowfall that require work by snow removal vehicles. In addition, because installation can be done in a short construction period, the time that the road (lanes) are closed is short, and buried objects can be installed even on roads that are in operation.

[0032] [Variation 1] In the above embodiment, the excavation step is described as simply excavating the asphalt layer 102. However, in the excavation step, a horizontal hole 102a as shown in FIG. 13 may be drilled in the cross section of the asphalt layer 102 located at the excavation site. In the case where a horizontal hole is formed, when the concrete 50 is poured in the foundation formation step, the concrete 50 also flows into the horizontal hole 102a. Therefore, when the concrete 50 that has flowed into the horizontal hole 102a hardens, it serves as an anchor, and it becomes possible to suppress the concrete 50 (concrete 60) from floating up relative to the asphalt layer 102.

[0033] [Variation 2] Furthermore, when forming a horizontal hole 102a in the cross section of the asphalt layer 102 at the excavation site formed in the excavation step as in the first modified example, a reinforcing bar 102b such as a deformed steel bar may be placed in the horizontal hole 102a (see FIG. 14). With this configuration, the effect of suppressing the floating of the concrete 50 (concrete 60) can be improved. [Industrial Applicability]

[0034] In the above embodiment, the buried object 10 is fixed to the guide plate 16 by welding on-site. However, depending on the shape of the guide plate 16 and the size of the buried object 10, the buried object 10 and the guide plate 16 may be fixed to each other in advance before being transported to the site, and then the buried object 10 and the guide plate 16 may be fixed to each other in advance.

[0035] In the above embodiment, the metal plate 10c is attached to the buried object 10 via the grout material 10b. However, the metal member attached to the buried object 10 is not limited to a plate-like member, and may be in any shape, such as a block or rod, as long as the metal is weldable. [Explanation of symbols]

[0036] 10...Buried object, 10a...Axle load sensor, 10b...Grout material, 10c...Metal plate, 12...Frame, 12a...Main reinforcement, 12b...Anchor reinforcement, 12c...Foundation reinforcement, 14...Anchor, 16...Guidance plate, 16a...Lower edge, 16b...Upper edge, 16c...First side edge, 16d...Second side edge, 16e...Inclined edge, 16f...Opening, 18...Reinforcing bar, 20...Auxiliary plate, 50...Concrete, 60...Concrete, 100...Road, 102...Asphalt layer, 102a...Horizontal hole, 102b...Reinforcing bar, 104...Subgrade, 106...Subgrade.

Claims

1. A method for installing buried objects on roads that do not have decks in areas with heavy snowfall, comprising: an excavation step of excavating the asphalt layer to expose the roadbed or subgrade; A platform installation process for installing a platform on the roadbed or the roadbed; A temporary installation step of fixing an induction plate and an embedded object to the frame; A method for installing buried objects in a roadway, comprising a concrete pouring process for pouring concrete into the excavated area formed by the excavation process, thereby burying the base, the guide plate, and the buried object.

2. After the frame installation step and before the temporary installation step, 2. The method for installing a buried object in a roadway according to claim 1, further comprising a step of forming a foundation for pouring concrete to fix the mounting base and function as an anchor.

3. A metal member is attached to the buried object via a grout material, In the temporary installation step, the guide plate is fixed to the stand, 3. The method for installing a buried object in a roadway according to claim 2, wherein the buried object is fixed to the guide plate directly or indirectly via the metal member.

4. 4. The method for installing a buried object in a roadway according to claim 1, wherein in the excavation step, a horizontal hole is drilled in a cross section of the asphalt layer located at the excavation site.

5. The method for installing a buried object in a roadway according to claim 4, characterized in that in the mounting installation step, a reinforcing bar is placed in the horizontal hole.

6. 6. The method for installing a buried object in a roadway according to claim 5, wherein the concrete is an ultra-fast hardening concrete.

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