Method for constructing an automotive pit

Abstract

This invention provides a method for constructing an automobile pit that can shorten the construction period. [Solution] A method for constructing an automobile pit formed beneath the floor of a pit construction site for inspecting or maintaining automobiles comprises: a manufacturing step of manufacturing a concrete slab having one surface that constitutes the bottom surface of the automobile pit, and a metal frame having an inner surface that constitutes the wall surface of the automobile pit, in a factory; a transport step of transporting the concrete slab and frame manufactured in the manufacturing step from the factory to the pit construction site; an excavation step of excavating the floor of the pit construction site to form a recess on which the concrete slab can be placed; a placement step of placing the concrete slab in the recess; and a fixing step of placing the frame on the concrete slab and fixing it to the concrete slab.

Description

Technical Field

[0001] The present disclosure relates to a method for constructing a pit for automobiles.

Background Art

[0002] In an automobile maintenance factory, in order to inspect or maintain the bottom part of an automobile, the floor surface is excavated to construct a pit, and a lift device for raising the vehicle from the floor surface and various inspection devices are installed in this pit. In the conventional method for constructing a pit for automobiles, the floor surface of the maintenance factory is excavated to form a recess, a formwork is assembled in this recess, steel bars and the like are arranged in the space partitioned by this formwork, concrete is placed, and after the placed concrete is cured, the formwork is removed. Such a conventional construction method requires a lot of time for the work of manufacturing a formwork for forming a concrete placing space in the recess formed on the floor surface and for curing the placed concrete.

[0003] In Patent Document 1, a pit construction method that can shorten the construction period compared to the above conventional construction method has been proposed. This pit construction method manufactures a concrete molded body having a groove for forming a pit at a location different from the floor surface for constructing the pit, forms a recess on the floor surface for constructing the pit where the concrete molded body can be placed, and by placing the concrete molded body in this recess, the curing period of the concrete at the pit construction site can be shortened and the construction period can be shortened.

Prior Art Documents

Patent Documents

[0004] <-

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The invention described in Patent Document 1 discloses dividing a concrete molded body into multiple parts so that it can be transported by a transport vehicle such as a truck. However, when a concrete molded body is divided into multiple parts for transport, it is necessary to integrate the divided concrete molded bodies into a single shape. This process of integrating the divided concrete molded bodies into a single shape is a complicated process that involves aligning the positions and heights of the multiple concrete molded bodies, and therefore does not allow for a significant reduction in construction time. Further reduction in construction time is desired.

[0006] In view of the circumstances described above, at least one embodiment of this disclosure aims to provide a method for constructing an automobile pit that can shorten the construction period. [Means for solving the problem]

[0007] A method for constructing an automotive pit according to at least one embodiment of the present disclosure is: A method for constructing an automobile pit, which is formed beneath the floor surface of a pit construction site for inspecting or maintaining automobiles, A manufacturing process for manufacturing, in at least one factory, a concrete slab having one surface that constitutes the bottom surface of the automobile pit, and a metal frame having an inner surface that constitutes the wall surface of the automobile pit, A transport process for transporting the concrete slabs and frames manufactured in the above manufacturing process from at least one factory to the pit construction site, An excavation step of excavating the floor surface of the pit construction site to form a recess on which the concrete slab can be placed, A placement step of placing the concrete slab in the recess, The process includes a fixing step of placing the frame on the concrete plate and fixing it to the concrete plate. [Effects of the Invention]

[0008] According to at least one embodiment of this disclosure, a method for constructing an automobile pit that can shorten the construction period is provided. [Brief explanation of the drawing]

[0009] [Figure 1] This is a process diagram showing a method for constructing an automobile pit according to one embodiment of the present disclosure. [Figure 2] This is a schematic perspective view of a concrete slab and frame constituting an automobile pit according to one embodiment of the present disclosure. [Figure 3] This is a schematic plan view from above of a concrete slab and frame constituting an automobile pit according to one embodiment of the present disclosure, with the slab and frame placed in a recess. [Figure 4] This is a schematic cross-sectional view showing a concrete slab and frame constituting an automobile pit according to one embodiment of the present disclosure, placed in a recessed area. [Figure 5] This is a schematic cross-sectional view of an automotive pit during the grout injection process of a method for constructing an automotive pit according to one embodiment of the present disclosure. [Figure 6] This is a schematic cross-sectional view of an automotive pit after the grout injection process in a method for constructing an automotive pit according to one embodiment of the present disclosure. [Figure 7] This is a schematic plan view from above of a concrete slab and frame constituting an automobile pit according to one embodiment of the present disclosure, with the slab and frame placed in a recess. [Figure 8] This is a schematic cross-sectional view of an automotive pit after the grout injection process in a method for constructing an automotive pit according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0010] Hereinafter, several embodiments of this disclosure will be described with reference to the attached drawings. However, the dimensions, materials, shapes, relative arrangements, etc., of the components described or shown in the drawings as embodiments are not intended to limit the scope of this disclosure, but are merely illustrative examples.

[0011] (Method for constructing an automotive pit) Figure 1 is a process diagram showing a method for constructing an automobile pit 1 according to one embodiment of the present disclosure. The automobile pit 1 is formed beneath the floor surface 4 of a pit construction site and forms a recessed space 10 for inspecting or maintaining automobiles (vehicles). The pit construction site is, for example, formed beneath the floor surface 4 indoors or outdoors in a maintenance factory where vehicles are inspected or maintained. A method for constructing an automobile pit 1 according to several embodiments, as shown in Figure 1, comprises a manufacturing process S1, a transport process S2, an excavation process S3, a placement process S4, a fixing process S5, and a grout injection process S6.

[0012] Figure 2 is a schematic perspective view of the concrete slab 2 and frame 3 constituting an automobile pit 1 according to one embodiment of the present disclosure. Figure 4 is a schematic plan view from above of the concrete slab 2 and frame 3 constituting an automobile pit 1 according to one embodiment of the present disclosure, placed in the recess 5. Figure 4 is a schematic cross-sectional view of the concrete slab 2 and frame 3 constituting an automobile pit 1 according to one embodiment of the present disclosure, placed in the recess 5. The shape of the automobile pit 1 is formed by combining the concrete slab 2 and the metal frame 3, as shown in Figures 2 to 4.

[0013] (manufacturing process) In manufacturing process S1, the concrete slabs 2 and the frame 3 are manufactured in at least one factory. The concrete slabs 2 and the frame 3 are manufactured in a location different from the pit construction site where the automobile pit 1 is constructed. The factories for manufacturing the concrete slabs 2 and the frame 3 may be located far from the pit construction site or adjacent to it. The factory for manufacturing the frame 3 may be the same factory as the factory for manufacturing the concrete slabs 2 or a different factory.

[0014] (Concrete slab) As shown in FIGS. 2 to 4, the concrete slab 2 is in the shape of a flat plate having one surface 21 that constitutes the bottom surface of the vehicle pit 1 and another surface 22. The one surface 21 is an end surface on one side in the thickness direction of the concrete slab 2, and the other surface 22 is an end surface on the other side in the thickness direction of the concrete slab 2.

[0015] In the manufacturing process S1, a formwork manufacturing step of manufacturing a formwork that forms a placement space where the flowing concrete is placed, a reinforcement placement step of arranging reinforcing bars in the placement space, a placement step of pouring concrete into the placement space, and a demolding step of demolding the hardened concrete slab 2 from the formwork after curing the concrete placed in the placement space are appropriately performed. The concrete slab 2 is manufactured in a factory for manufacturing the concrete slab 2 through steps such as the formwork manufacturing step, the reinforcement placement step, the placement step, and the demolding step.

[0016] (Frame body) As shown in FIGS. 2 to 4, the frame body 3 has an inner surface 31 and an outer surface 32 that constitute the wall surface of the vehicle pit 1. The concave space 10 is formed by the inner surface 31 of the frame body 3 and the one surface 21 of the concrete slab 2 when the frame body 3 is placed on the one surface 21 of the concrete slab 2. In the illustrated embodiment, as shown in FIG. 3, when viewed from above, the frame body 3 includes a first side portion 3A extending along a first extending direction, a second side portion 3B extending along the first extending direction and facing the first side portion 3A with the concave space 10 interposed therebetween, a third side portion 3C extending along a second extending direction intersecting (orthogonal in the illustrated example) with the first extending direction, and a fourth side portion 3D extending along the second extending direction and facing the third side portion 3C with the concave space 10 interposed therebetween.

[0017] In the manufacturing process S1, a preparation step of preparing long metal members that respectively constitute a plurality of side portions (the first side portion 3A to the fourth side portion 3D) of the frame body 3, and a frame body forming step of forming the frame body 3 by connecting these metal members by welding or the like are appropriately performed. The frame body 3 is manufactured in a factory for manufacturing the frame body 3 through steps such as the preparation step and the frame body forming step.

[0018] Some of the multiple sides of the frame 3 (first side 3A to fourth side 3D) may have concave shapes that are recessed toward the center of the frame 3 so as to reduce the recessed space 10 when viewed from above, or they may have convex shapes that are projected away from the center of the frame 3 so as to enlarge the recessed space 10 when viewed from above. Alternatively, the frame 3 may be formed in a rectangular frame shape in which none of the multiple sides of the frame 3 (first side 3A to fourth side 3D) have the above-mentioned concave or convex shapes.

[0019] (Conveying process) In the transport process S2, the concrete slabs 2 and frames 3 manufactured in the manufacturing process S1 are transported from their respective manufacturing plants to the pit construction site. For example, the concrete slabs 2 and frames 3 are small enough to be loaded onto a transport vehicle such as a truck, and are loaded onto the transport vehicle and transported from the manufacturing plant to the pit construction site. Then, the concrete slabs 2 and frames 3 are unloaded from the transport vehicle, transported to the pit construction site, and placed in the recess 5. The concrete slabs 2 and frames 3 may be transported by the same transport vehicle, or they may be transported by different transport vehicles.

[0020] (Excavation process, installation process) In the excavation process S3, the floor surface 4 of the pit construction site is excavated to form a recess 5 on which the concrete slab 2 can be placed. For example, in the excavation process S3, after drawing an excavation line that defines the position to be excavated on the floor surface 4 of the pit construction site, a cutter device is used to cut the concrete layer forming the floor surface 4 along the excavation line. After that, the cut concrete layer is removed and the soil layer below the concrete layer is excavated to form a recess 5 inside the excavation line. In the placement process S4, the concrete slab 2 that was transported to the pit construction site in the transport process S2 is placed in the recess 5 formed in the excavation process S3.

[0021] (recess) As shown in Figure 4, the recess 5 is composed of a wall surface (side wall surface) 51 extending downward from the floor surface 4 and a bottom wall surface 52. The depth of the bottom wall surface 52 from the floor surface 4 is greater than the sum of the heights of the concrete slab 2 and the frame 3. The concrete slab 2 is set to have a larger planar dimension than the frame 3 so that it can close the opening in the frame 3. The recess 5 is set to have a larger planar dimension than the concrete slab 2 so that the concrete slab 2 can be placed inside the recess 5. The wall surface 51 forming the recess 5 is designed so that a gap is formed between the concrete slab 2 and the frame 3, respectively, allowing grout material 6 to be injected, surrounding each of the concrete slab 2 and the frame 3.

[0022] In the embodiments shown in Figures 2 to 4, the recessed space 10 formed by the frame 3, the concrete plate 2, and the recess 5 are each formed in a U-shape when viewed from above, but the shape is not limited to this. For example, the recessed space 10 formed by the frame 3, the concrete plate 2, and the recess 5 may each be formed in a rectangular shape when viewed from above. The shape of the recessed space 10 formed by the frame 3, the concrete plate 2, and the recess 5 can be changed according to the shape required for the automobile pit 1.

[0023] (Fixed process) In fixing step S5, the frame 3 is placed on the concrete slab 2 which is placed in the recess 5 and fixed to the concrete slab 2. In the illustrated embodiment, as shown in Figure 4, the frame 3 has a cross-sectional shape that includes a web portion 33 extending along a first direction (vertical direction), a first flange portion 34 extending along a second direction (horizontal direction) that intersects the first direction from one end (upper end) of the web portion 33, and a second flange portion 35 extending along the second direction from the other end (lower end) of the web portion 33. The groove 36 formed by the web portion 33, the first flange portion 34, and the second flange portion 35 is positioned toward the wall surface 51 that forms the recess 5.

[0024] The second flange portion 35 is configured such that at least a part of it abuts against one surface 21 of the concrete slab 2. In the illustrated embodiment, the frame 3 is fixed to the concrete slab 2 by embedding an anchor member 11 (for example, an anchor bolt) into one surface 21 through an anchor insertion hole 351 formed in the second flange portion 35, and sandwiching the second flange portion 35 between the anchor member 11 and the concrete slab 2.

[0025] (Grout injection process) In the grout injection process S6, grout material 6 is injected into at least a portion of the space between the frame 3 and the wall surface 51 that forms the recess 5. As the material for the grout material 6, for example, cement-based materials, glass-based materials, synthetic resins, etc., are used.

[0026] According to the construction method for the automobile pit 1 described above, the automobile pit 1 is composed of a concrete slab 2 and a frame 3, and before the frame 3 is fixed to the concrete slab 2, the concrete slab 2 and the frame 3 are separated. The concrete slab 2 and the frame 3 are lower in height and lighter in weight compared to the other structures that make up the automobile pit 1. Therefore, the transport work of the concrete slab 2 and the frame 3 in the transport process S2, the placement work of the concrete slab 2 in the placement process S4, and the placement work of the frame 3 in the fixing process S5 are made easier. In addition, since the shape of the automobile pit 1 can be formed by fixing the frame 3, which is placed on the concrete slab 2, the construction work of the automobile pit 1 is made easier. Thus, according to the construction method for the automobile pit 1 described above, the construction period for the automobile pit 1 can be shortened.

[0027] According to the construction method for the automobile pit 1 described above, by injecting grout material 6 between the frame 3 and the wall surface 51 that forms the recess 5, the frame 3 can be stably supported by the grout material 6 surrounding the frame 3 and the wall surface 51 of the recess 5.

[0028] According to the construction method for the automobile pit 1 described above, the frame 3 includes a first flange portion 34 and a second flange portion 35, which allows for high rigidity and stable support of devices and equipment installed in the automobile pit 1. Furthermore, because the frame 3 includes a first flange portion 34 and a second flange portion 35, its posture is stable when placed on the concrete slab 2, making the placement and fixing work of the frame 3 in the fixing process S5 easier. When grout material 6 is injected between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5, the grout material 6 filled in the groove 36 of the frame 3 enhances the adhesion of the grout material 6 to the frame 3, so that the frame 3 can be stably supported by the grout material 6 surrounding it.

[0029] Figure 5 is a schematic cross-sectional view of an automobile pit during the grout injection step S6 of a method for constructing an automobile pit 1 according to one embodiment of the present disclosure. Figure 6 is a schematic cross-sectional view of an automobile pit after the grout injection step S6 of a method for constructing an automobile pit according to one embodiment of the present disclosure. In some embodiments of the method for constructing an automobile pit 1, the grout injection step S6 is performed after the placement step S4. The grout injection step S6 includes a first step S61 of forming through holes 23 in a concrete slab 2, and a second step S62 after the first step S61 of injecting grout material 6 between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5 through the through holes 23. In the grout injection step S6, after the second step S62, grout material 6 is injected into the gap between the frame 3, which is placed on and fixed to the concrete slab 2, and the wall surface 51 of the recess 5 (see Figure 6).

[0030] According to the construction method for the automobile pit 1 described above, even if the grout injection process S6 is performed after the placement process (S4), it is possible to inject grout material 6 between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5 through the through hole 23. By injecting grout material 6 between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5, the concrete slab 2 can be stably supported by the grout material 6 under the concrete slab 2 and the bottom wall surface 52 of the recess 5. When injecting grout material 6 between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5, it is possible to adjust the leveling of the concrete slab 2 by adjusting the amount of grout material 6 injected according to the injection location of the grout material 6. Here, "leveling" refers to adjusting the concrete slab 2 so that it is in a horizontal position without tilting as a whole.

[0031] In some embodiments of the method for constructing an automobile pit 1, the above-described placement step S4 includes a leveling step S41 in which the concrete slab 2 is lifted by a lifting device 12 so that the leveling of the concrete slab 2 can be adjusted. As shown in Figure 5, the lifting device 12 is stretched over the recess 5 and is positioned on a support member 13 whose ends are supported by the floor surface 4. The concrete slab 2 is connected to a lifting wire 14 of the lifting device 12 and is lifted within the recess 5 by the lifting wire 14. In one embodiment, in the leveling step S41, the concrete slab 2 is positioned at a height such that when the frame 3 is placed on the concrete slab 2, the upper surface of the frame 3 is aligned with the floor surface 4.

[0032] According to the construction method for the automobile pit 1 described above, the leveling work of the concrete slab 2 is made easier by lifting the concrete slab 2 with the lifting device 12 in the leveling step S41.

[0033] In the construction method of the automobile pit 1 according to several embodiments, the second step S62 described above is carried out in parallel with the leveling step S41, as shown in Figure 5. Because the second step S62 is carried out in parallel with the leveling step S41, the grout material 6 can be injected between the concrete slab 2 lifted by the lifting device 12 and the bottom wall surface 52 that forms the recess 5. In this case, it becomes easier to inject the grout material 6. Furthermore, since the grout material 6 can be injected between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5 while the concrete slab 2 lifted by the lifting device 12 is in a horizontal position, the concrete slab 2 can be held precisely horizontally on the bottom wall surface 52 of the recess 5. Moreover, because the second step S62 is carried out in parallel with the leveling step S41, the working time required for these steps can be shortened.

[0034] (Reinforcement process) Figure 7 is a schematic plan view from above of a vehicle pit 1 according to one embodiment of the present disclosure, showing the concrete slab 2 and frame 3 that constitute the vehicle pit 1 placed in the recess 5. Figure 8 is a schematic cross-sectional view of the vehicle pit 1 after the grout injection process S6 in a construction method for the vehicle pit 1 according to one embodiment of the present disclosure. In some embodiments of the construction method for the vehicle pit 1, a reinforcement step S7 is further included, as shown in Figure 1. The reinforcement step S7 is performed after the fixing step S5 and before the completion of the grout injection step S6. In some other embodiments of the construction method for the vehicle pit 1, the reinforcement step S7 may not be included.

[0035] In the reinforcement step S7, as shown in Figure 7, multiple first reinforcing bars 71 are arranged at intervals to surround the outer perimeter of the frame 3, and are erected from the concrete slab 2 and extend vertically. Second reinforcing bars 72, which extend horizontally, are connected to two or more of the multiple first reinforcing bars 71. The outer perimeter of the frame 3 is surrounded by the multiple second reinforcing bars 72. The lower end of each of the multiple first reinforcing bars 71 is embedded in one surface 21 of the concrete slab 2, and the upper end protrudes above one surface 21 of the concrete slab 2. The second reinforcing bars 72 are connected to the upper ends of each of the multiple first reinforcing bars 71. The reinforcement step S7 may also include a step of connecting a third reinforcing bar 73, which is connected to either the web portion 33 or the first flange portion 34, to at least one of the first reinforcing bars 71 or the second reinforcing bars 72. The first reinforcement 71, the second reinforcement 72, and the third reinforcement 73 are provided in the recess 5, and the area around them is filled with grout material 6 during the grout injection process S6.

[0036] According to the construction method for the automobile pit 1 described above, when injecting grout material 6 between the concrete slab 2 and the bottom wall surface 52 that forms the recess 5, the adhesion of the grout material 6 to the concrete slab 2 and the frame 3 can be enhanced by the multiple first reinforcing bars 71 and second reinforcing bars 72 that are erected from the concrete slab 2. In this case, the grout material 6 surrounding the frame 3 can stably support the concrete slab 2 and the frame 3.

[0037] In some embodiments of the construction method for the automobile pit 1, a floor reinforcement step S8 is further included, as shown in Figure 1. The floor reinforcement step S8 is performed after the fixing step S5 and before the completion of the grout injection step S6. In some other embodiments of the construction method for the automobile pit 1, the floor reinforcement step S8 may not be included.

[0038] In the floor reinforcement step S8, one end of at least one (multiple in the illustrated example) floor reinforcement member 8, which extends horizontally along the floor surface 4, is connected to the upper part of the frame 3. The other end of the floor reinforcement member 8 extends toward the wall surface 51 that forms the recess 5. The multiple floor reinforcement members 8 are spaced apart in a direction that intersects (orthogonal in the illustrated example) the direction in which the floor reinforcement members 8 extend. In the illustrated embodiment, the floor reinforcement member 8 has an L-shaped cross-sectional shape including a first side extending horizontally and a second side extending downward from the end of the first side. However, the floor reinforcement member 8 is not limited to the above L-shaped cross-sectional shape.

[0039] According to the construction method for the automobile pit 1 described above, some of the devices and equipment for inspecting or maintaining automobiles are placed on the floor reinforcement member 8, and these devices and equipment are supported by the floor reinforcement member 8 rather than the floor surface 4, thereby preventing excessive loads from being placed on the floor surface 4 and damaging it.

[0040] In some embodiments of the method for constructing the automotive pit 1, a sealing step S9 is further included, as shown in Figure 1. The sealing step S9 is performed after the fixing step S5 and before the completion of the grout injection step S6. In some other embodiments of the method for constructing the automotive pit 1, the sealing step S9 may not be included.

[0041] In the sealing process S9, a sealing member 9 is installed that covers at least a portion of the inner surface 31 of the frame 3 and at least a portion of one surface 21 that constitutes the bottom surface of the automobile pit 1 on the concrete slab 2. The sealing member 9 is positioned to cover the area of ​​the surface 21 that is inward of the frame 3. The sealing member 9 may be, for example, a liquid sealing material at the time of installation, or a solid sealing material made of a resin material such as a rubber seal. In the illustrated embodiment, the sealing member 9 has an L-shaped cross-sectional shape including a first side having a first contact surface that abuts against the inner surface 31, and a second side having a second contact surface that abuts against the surface 21 inward of the frame 3. However, the sealing member 9 is not limited to the above L-shaped cross-sectional shape. For example, the sealing member 9 may have a triangular cross-sectional shape including the first and second sides, or a fan-shaped cross-sectional shape including the first and second sides.

[0042] According to the above-described method for constructing the automobile pit 1, by installing the sealing member 9 in the sealing process S9, it is possible to effectively suppress water from entering the inside of the frame 3 (recessed space 10) through the gap between the concrete plate 2 and the frame 3, thereby effectively suppressing corrosion and deterioration of the devices and equipment installed in the automobile pit 1 due to water.

[0043] In this specification, expressions describing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" shall not only describe such arrangements strictly, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions such as "identical," "equal," and "homogeneous" that describe things being in an equal state not only describe a state of being strictly equal, but also describe a state in which there is a tolerance or a difference that is sufficient to achieve the same function. Furthermore, in this specification, expressions describing shapes such as quadrilaterals and cylindrical shapes shall not only represent geometrically precise quadrilaterals and cylindrical shapes, but also shapes that include uneven surfaces, chamfered surfaces, etc., to the extent that the same effect can be achieved. Furthermore, in this specification, the expressions “equipment,” “includes,” or “possess” of a component are not exclusive expressions that exclude the existence of other components.

[0044] This disclosure is not limited to the embodiments described above, but also includes modified forms of the embodiments described above, as well as forms that combine these forms as appropriate.

[0045] The contents described in some of the embodiments above can be understood, for example, as follows:

[0046] 1) A method for constructing an automotive pit (1) according to at least one embodiment of the present disclosure is: A method for constructing an automobile pit (1) formed beneath the floor surface (4) of a pit construction site for inspecting or maintaining automobiles, A manufacturing process (S1) in which a concrete slab (2) having one surface (21) that constitutes the bottom surface of the automobile pit (1), and a metal frame (3) having an inner surface (31) that constitutes the wall surface of the automobile pit (1) are each manufactured in at least one factory, A transport process (S2) is performed to transport the concrete slab (2) and the frame (3) manufactured in the manufacturing process (S1) from at least one factory to the pit construction site. The excavation step (S3) involves excavating the floor surface (4) of the pit construction site to form a recess (5) on which the concrete slab (2) can be placed, The placement step (S4) involves placing the concrete slab (2) in the recess (5), The process includes a fixing step (S5) of placing the frame (3) on the concrete plate (2) and fixing it to the concrete plate (2).

[0047] According to method 1) above, the automobile pit (1) is composed of a concrete slab (2) and a frame (3), and before the frame (3) is fixed to the concrete slab (2), it is separated into the concrete slab (2) and the frame (3). The concrete slab (2) and the frame (3) are lower in height and lighter in weight compared to the structures that make up the automobile pit (1). Therefore, the transport work of the concrete slab (2) and the frame (3) in the transport process (S2), the placement work of the concrete slab (2) in the placement process (S4), and the placement work of the frame (3) in the fixing process (S5) are made easier. In addition, since the shape of the automobile pit (1) can be formed by fixing the frame (3) placed on the concrete slab (2) to the concrete slab (2), the construction work of the automobile pit (1) is made easier. Thus, according to method 1) above, the construction period of the automobile pit (1) can be shortened.

[0048] 2) In some embodiments, the method for constructing the automobile pit (1) described in 1) above, The method further includes a grout injection step (S6) in which grout material (6) is injected into at least a portion of the space between the frame (3) and the wall surface (51) that forms the recess (5).

[0049] According to the method described in 2) above, by injecting grout material (6) between the frame (3) and the wall surface (51) that forms the recess (5), the frame (3) can be stably supported by the grout material (6) surrounding the frame (3) and the wall surface (51) of the recess (5).

[0050] 3) In some embodiments, the method for constructing the automobile pit (1) described in 2) above, The grout injection process (S6) is performed after the setting process (S4) described above. The aforementioned grout injection process (S6) is performed The first step (S61) is to form a through hole (23) in the concrete slab (2), The method includes, after the first step (S61), a second step (S62) in which the grout material (6) is injected between the concrete slab (2) and the bottom wall surface (52) that forms the recess (5) through the through hole (23).

[0051] According to method 3) above, even if the grout injection process (S6) is performed after the placement process (S4), it becomes possible to inject grout material (6) between the concrete slab (2) and the bottom wall surface (52) that forms the recess (5) through the through hole (23). By injecting grout material (6) between the concrete slab (2) and the bottom wall surface (52) that forms the recess (5), the concrete slab (2) can be stably supported by the grout material (6) under the concrete slab (2) and the bottom wall surface (52) of the recess (5). Furthermore, when injecting grout material (6) between the concrete slab (2) and the bottom wall surface (52) that forms the recess (5), it becomes possible to adjust the leveling of the concrete slab (2) by adjusting the amount of grout material (6) injected according to the injection location of the grout material (6).

[0052] 4) In some embodiments, the method for constructing the automobile pit (1) described in 3) above, The aforementioned placement step (S4) is, The method includes a leveling step (S41) in which the concrete slab (2) is lifted by a lifting device (12) so that the leveling of the concrete slab (2) can be adjusted.

[0053] According to the method described in 4) above, the leveling work of the concrete slab (2) is made easier by lifting the concrete slab (2) with a lifting device in the leveling step (S41).

[0054] 5) In some embodiments, the method for constructing the automobile pit (1) described in 4) above, The second step (S62) is carried out in parallel with the leveling step (S41).

[0055] According to the method described in 5) above, since the second step (S62) is performed in parallel with the leveling step (S41), the grout material (6) can be injected between the concrete slab (2) lifted by the lifting device and the bottom wall surface (52) that forms the recess (5). In this case, it becomes easier to inject the grout material (6). Furthermore, since the grout material (6) can be injected between the concrete slab (2) and the bottom wall surface (52) that forms the recess (5) while the concrete slab (2) lifted by the lifting device is maintained in a horizontal position, the concrete slab (2) can be held precisely horizontally on the bottom wall surface (52) of the recess (5). Moreover, since the second step (S62) is performed in parallel with the leveling step (S41), the working time required for these steps can be shortened.

[0056] 6) In some embodiments, a method for constructing an automobile pit (1) as described in any of 2) to 5) above, The system further includes a reinforcement step (S7) of arranging multiple first reinforcing bars (71) at intervals surrounding the frame (3) and extending vertically from the concrete slab (2), and connecting two or more of the multiple first reinforcing bars (71) with second reinforcing bars (72) that extend horizontally.

[0057] According to the method described in 6) above, when injecting grout material (6) between the concrete slab (2) and the bottom wall surface (52) forming the recess (5), the adhesion of the grout material (6) to the concrete slab (2) and the frame (3) can be enhanced by the multiple first reinforcing bars (71) and second reinforcing bars (72) erected from the concrete slab (2). In this case, the grout material (6) surrounding the frame (3) can stably support the concrete slab (2) and the frame (3).

[0058] 7) In some embodiments, a method for constructing an automobile pit (1) as described in any of 2) to 6) above, The method further includes a floor reinforcement step (S8) in which one end of at least one floor reinforcement member (8) extending horizontally along the floor surface (4) is connected to the upper part of the frame (3).

[0059] According to the method described in 7) above, by placing some of the devices and equipment used for inspecting or maintaining automobiles on the floor reinforcement member (8) and supporting these devices and equipment on the floor reinforcement member (8) rather than on the floor surface, it is possible to prevent excessive load from being applied to the floor surface and damaging it.

[0060] 8) In some embodiments, a method for constructing an automobile pit (1) as described in any of 1) to 7) above, The method further includes a sealing step (S9) in which a sealing member (9) is installed that covers at least a portion of the inner surface (31) of the frame (3) and at least a portion of the one surface (21) that constitutes the bottom surface of the concrete slab (2).

[0061] According to the method described in 8) above, by installing the sealing member (9) in the sealing process (S9), it is possible to effectively suppress water from entering the inside of the frame (3) through the gap between the concrete slab (2) and the frame (3), thereby effectively suppressing corrosion and deterioration of the devices and equipment installed in the automobile pit (1) due to water.

[0062] 9) In some embodiments, a method for constructing an automobile pit (1) as described in any of 1) to 8) above, The aforementioned frame (3) is A web portion (33) extending along the first direction, A first flange portion (34) extends from one end of the web portion (33) along a second direction intersecting the first direction, The cross-sectional shape includes a second flange portion (35) extending along the second direction from the other end of the web portion (33), The groove (36) formed by the web portion (33), the first flange portion (34), and the second flange portion (35) is positioned toward the wall surface (51) that forms the recess (5).

[0063] According to the method described in 9) above, the frame (3) includes a first flange portion (34) and a second flange portion (35), which allows for high rigidity and stable support of devices and equipment installed in the automobile pit (1). Furthermore, because the frame (3) includes a first flange portion (34) and a second flange portion (35), its posture when placed on the concrete slab (2) is stable, making the placement and fixing of the frame (3) in the fixing process (S5) easier. When grout material (6) is injected between the concrete slab (2) and the bottom wall surface (52) that forms the recess (5), the grout material (6) filled in the groove (36) of the frame (3) enhances the adhesion of the grout material (6) to the frame (3), so that the frame (3) can be stably supported by the grout material (6) surrounding it. [Explanation of Symbols]

[0064] 1. Automotive pit 2. Concrete slab 21 one side 22 Other side 23 Through hole 3 Frame 31 Inner self 32 Exterior 33 Web Department 34 First flange section 35 Second flange section 36 Groove 4 Floor surface 5 recesses 51 Wall surface 52 Bottom wall 6. Grout material 71 First Muscle 72 Second muscle 73 Third muscle 8 Floor reinforcement members 9. Sealing member 10 Concave space 11 Anchor members 12 Lifting device 13 Support Member 14 Lifting wire S1 Manufacturing process S2 Transport process S3 Excavation Process S4 Placement process S5 Fixed process S6 grouting process S7 Reinforcement process S8 Floor reinforcement process S9 Sealing process S41 Leveling Step S61 First Step S62 2nd Step

Claims

1. A method for constructing an automobile pit, which is formed beneath the floor surface of a pit construction site for inspecting or maintaining automobiles, A manufacturing process for manufacturing, in at least one factory, a concrete slab having one surface that constitutes the bottom surface of the automobile pit, and a metal frame having an inner surface that constitutes the wall surface of the automobile pit, A transport process for transporting the concrete slabs and frames manufactured in the above manufacturing process from at least one factory to the pit construction site, An excavation step of excavating the floor surface of the pit construction site to form a recess on which the concrete slab can be placed, A placement step of placing the concrete slab in the recess, The process includes a fixing step of placing the frame on the concrete plate and fixing it to the concrete plate. Methods for constructing automotive pits.

2. The method further includes a grout injection step of injecting grout material into at least a portion of the space between the frame and the wall surface forming the recess. A method for constructing an automobile pit according to claim 1.

3. The grout injection process is performed after the setting process described above. The aforementioned grout injection process is, The first step is to form a through hole in the concrete slab, The process includes, after the first step, injecting the grout material between the concrete slab and the bottom wall surface forming the recess through the through hole, A method for constructing an automobile pit according to claim 2.

4. The aforementioned placement process is, The leveling step includes lifting the concrete slab by a lifting device so that the leveling of the concrete slab can be adjusted, A method for constructing an automobile pit according to claim 3.

5. The second step is carried out in parallel with the leveling step. A method for constructing an automobile pit according to claim 4.

6. The process further includes arranging a plurality of first reinforcing bars, which are spaced apart to surround the frame and extend vertically from the concrete slab, and connecting two or more of the plurality of first reinforcing bars with second reinforcing bars that extend horizontally. A method for constructing an automobile pit according to any one of claims 2 to 5.

7. The floor reinforcement step further comprises connecting one end of at least one floor reinforcement member, which extends horizontally along the floor surface, to the upper part of the frame, A method for constructing an automobile pit according to any one of claims 2 to 5.

8. The method further includes a sealing step of installing a sealing member that covers at least a portion of the inner surface of the frame and at least a portion of one surface constituting the bottom surface of the concrete slab. A method for constructing an automobile pit according to any one of claims 1 to 5.

9. The aforementioned frame body is A web portion extending along the first direction, A first flange portion extending from one end of the web portion along a second direction intersecting the first direction, The cross-sectional shape includes a second flange portion extending along the second direction from the other end of the web portion, The groove formed by the web portion, the first flange portion, and the second flange portion is positioned toward the wall surface forming the recess. A method for constructing an automobile pit according to any one of claims 1 to 5.

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