Installation method and auxiliary formwork members for a sprinkler-type snow melting system

Abstract

To provide a construction method of a water spray-type snow melting device capable of easily adjusting the height of an upper- end surface of a concrete form installed on a construction surface, and an auxiliary form member usable for the same.SOLUTION: Auxiliary form members 12 (1) and 12 (2) are prepared which are respectively attached to the upper-end parts of buried form members 10 (1) and 10 (2) are used as the upper-end parts of concrete forms 18 (1) and 18 (2), and can adjust the heights of the upper-end surfaces 18a (1) and 18a (2) of the concrete forms 18 (1) and 18 (2) by adjusting the attachment heights with respect to the buried form members 10 (1) and 10 (2). The mounting height of the auxiliary form members 12 (1), 12 (2) to the buried form members 10 (1), 10 (2) is adjusted in an installation step K12 of the concrete form or the like, and the heights of the upper-end face 18a (1), 18a (2) are matched with the nozzle 40b.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a construction method of a sprinkler type snow melting device in which a water supply pipe and a plurality of nozzles are buried underground, and snow is melted by discharging water in the water supply pipe from the nozzles to the ground surface, and an auxiliary form member that can be used for this.

Background Art

[0002] Conventionally, a sprinkler type snow melting device buried in a road, a parking lot, etc. has been constructed by the method shown in FIG. 16. First, as shown in FIG. 16(a), on the construction surface 1 of the site, a pair of left and right wooden or iron formworks 2(1), 2(2) for concrete, which are substantially rectangular and have substantially the same height, are erected, and inside them, a snow melting member 3 in which members such as a water supply pipe 3a and nozzles 3b are integrally assembled in a reinforcing bar framework 3c is installed. Then, fresh concrete 4a is filled inside the formworks 2(1), 2(2) for concrete up to the height of the nozzles 3b, and this is hardened to form a concrete structure 4b.

[0003] After that, as shown in FIG. 16(b), after removing the formworks 2(1), 2(2) for concrete, a flat roadbed 5 is formed on the outer surface side of the concrete structure 4b, and further, a road base material 6 and asphalt 7 are laminated and paved in order on the roadbed 5 to finish. Generally, the work until the roadbed 5 is formed is often performed by a civil engineering contractor, and the subsequent work is often performed by a paving contractor.

[0004] Although omitted in FIG. 16, the formworks 2(1), 2(2) for concrete need to be positioned relative to each other by some method before the fresh concrete 4a is poured. For example, as disclosed in FIG. 2 of Patent Document 1, a spacing holding tool in which two regulating pieces (outer position regulating piece and inner position regulating piece) that stand up from the plate-shaped main body and face each other are formed at both ends in the length direction of the plate-shaped main body is prepared, and by attaching these to the upper end portion and the lower end portion of the formworks 2(1), 2(2) for concrete respectively, the formworks 2(1), 2(2) for concrete are connected and fixed to each other.

[0005] In addition to the method of pouring concrete on-site as described above, there is also the precast method, in which a concrete structure 4b with embedded snow-melting components 3 is manufactured in a factory, transported to the site, and assembled. However, the precast method has several disadvantages, such as the need for heavy machinery like cranes to transport the concrete structure 4b to the site, and the inability to flexibly adjust the dimensions of the concrete structure 4b on-site. Therefore, the method of pouring concrete on-site is a more versatile method that can be used at various sites. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-4225 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the conventional construction method shown in Figure 16, there is a problem in that it is time-consuming to adjust the height of the concrete structure 4b to match the height of the nozzle 3b.

[0008] In a sprinkler-type snow melting system, the top surface of the concrete structure 4b and the top surface of the nozzle 3b are required to be nearly flush in the finished state. However, in many cases, the construction surface 1 at the site is slightly sloped, or there are variations in the positional relationships of the various components that make up the snow melting component 3, making it impossible to accurately predict the height of the nozzle 3b when the snow melting component 3 is installed between the concrete formwork 2(1) and 2(2). Therefore, at the site, after installing the snow melting component 3 between the concrete formwork 2(1) and 2(2), the height of the nozzle 3b is determined using a spirit level, and marks are made on the concrete formwork 2(1) and 2(2) to indicate how high to fill with ready-mix concrete 4. This work is very time-consuming and requires skilled labor, so improvement was needed.

[0009] The present invention has been made in view of the above-mentioned background art, and aims to provide a method for constructing a sprinkler-type snow melting device that allows for easy adjustment of the height of the upper end surface of a concrete formwork installed on a construction surface, and an auxiliary formwork member that can be used therefor. [Means for solving the problem]

[0010] The present invention relates to a method for constructing a sprinkler-type snow melting device in which a water supply pipe and a plurality of nozzles are buried underground, and water from the water supply pipe is released onto the ground surface from the nozzles to melt snow. A formwork-related member preparation step, which involves preparing a pair of embedded formwork members made of substantially rectangular mortar boards, which are used as the main body portion of a concrete formwork erected in pairs on the left and right; a pair of auxiliary formwork members, which are attached to the upper ends of the pair of embedded formwork members and used as the upper end portion of the concrete formwork, and which allow the height of the upper end surface of the concrete formwork to be adjusted by adjusting the attachment height to the embedded formwork members; an upper connecting member for connecting and fixing the pair of auxiliary formwork members to each other while facing each other in the left and right direction; and a lower connecting member for connecting and fixing the pair of embedded formwork members to each other while facing each other in the left and right direction. A concrete formwork installation step comprising: installing the members prepared in the formwork-related member preparation step and the snow-melting member including the water supply pipe and the nozzle on the construction surface of the site, wherein the concrete formwork is formed by the buried formwork member and the auxiliary formwork member, the concrete formwork is erected in pairs on the left and right sides on the construction surface, the snow-melting member is installed in the space between the pair of concrete formwork, the pair of concrete formwork is connected and fixed to each other by the upper connecting member and the lower connecting member, and the mounting height of the auxiliary formwork member to the buried formwork member is adjusted so that the height of the upper end surface of the concrete formwork is set to the height of the nozzle, The method for constructing a sprinkler-type snow melting device is characterized by comprising a concrete pouring step of filling the inside of a pair of concrete formworks with ready-mix concrete up to the height of the upper end surface of the concrete formworks and allowing it to harden, and then removing the upper connecting member and the auxiliary formwork member at a predetermined timing.

[0011] The auxiliary formwork member comprises a main body, a plate-shaped mounting portion extending downward from the lower end of the main body, and an auxiliary screw hole formed in the inner region of the mounting portion. The embedded formwork member has a screw hole formed at a position corresponding to the auxiliary screw hole. At least one of the auxiliary screw hole of the auxiliary formwork member and the screw hole of the embedded formwork member is an elongated hole that is vertically long in the construction state. etc. In the installation process, the mounting portion is superimposed on the outer surface of the embedded formwork member, Auxiliary screw holes It is preferable to have a configuration in which a screw member is inserted so as to connect the auxiliary formwork member with the screw hole, the screw member is guided by the inner wall of the elongated hole so as to be able to move in the vertical direction, the height of the upper end surface of the concrete formwork is adjusted by moving the auxiliary formwork member in the vertical direction, and the height of the upper end surface of the concrete formwork is fixed by tightening the screw member.

[0012] The embedded formwork member is preferably manufactured using a 3D printer. Furthermore, the embedded formwork member is more preferably a mortar board with reinforcing wire mesh installed inside.

[0013] A process performed before the concrete pouring process, wherein a pair erected on the construction surface The aforementioned The system can be configured to include a formwork outer surface support step, in which an outer surface support member is placed on the outer surface of the concrete formwork to support it so that the concrete formwork does not tip over outward when the ready-mix concrete is poured into it.

[0014] The construction method may be configured to include a leveling step, which is performed after or in parallel with the concrete formwork installation step, in which a flat subgrade is formed on the outer surface of the embedded formwork member erected on the construction surface. Furthermore, the leveling step may be configured to pave the subgrade by sequentially layering base course material and asphalt on top of the subgrade.

[0015] The embedded formwork member has mounting holes formed at predetermined positions in the inner region, and the lower connecting member comprises a connecting bar and formwork holding fittings attached to both ends of the connecting bar, respectively, for concrete formwork etc. In the installation process, it is preferable to insert both ends of the connecting bar into the mounting holes of each of the buried formwork members, and position each of the buried formwork members on both ends of the connecting bar using the formwork holding fittings, thereby connecting and fixing a pair of the buried formwork members to each other, and to install the snow melting member on the upper surface of the connecting bar which is erected above the construction surface.

[0016] The upper connecting member is provided with formwork holding portions at both ends in the longitudinal direction of the connecting plate, each consisting of a plurality of upright pieces that stand up from the connecting plate and face each other, and the concrete formwork etc. In the installation process, it is preferable to connect and fix a pair of auxiliary formwork members to each other by inserting and fitting the upper end of each auxiliary formwork member between the multiple upright pieces, and in the concrete pouring process, to remove the upper connecting member from the auxiliary formwork member by pulling the upper connecting member upward and releasing the fitting between the formwork holding part and the upper end of each auxiliary formwork member.

[0017] Furthermore, the present invention relates to a member that is attached to the upper end of a plate-shaped main formwork member, which is the main body portion of a concrete formwork, and used as the upper end portion of the concrete formwork, It comprises a main body, a plate-shaped mounting portion extending downward from the lower end of the main body, and auxiliary screw holes formed in the inner region of the mounting portion. The other main formwork member has screw holes formed at positions corresponding to the auxiliary screw holes. The Mounting part At least one of the auxiliary screw holes and the screw holes of the main formwork member is a long hole that is long in the vertical direction in the construction state. All or part of the main body portion is arranged at a position higher than the upper end surface of the main formwork member. The mounting portion is overlapped on the outer surface side of the main formwork member. A screw member is inserted by communicating the screw hole of the main formwork member and the auxiliary screw hole. The screw member is guided by the inner wall of the long hole to be movable in the vertical direction, and by moving the main body portion and the mounting portion in the vertical direction, the height of the upper end surface of the concrete formwork can be adjusted, and by tightening the screw member, the height of the upper end surface of the concrete formwork can be fixed. It is an auxiliary formwork member.

Effect of the Invention

[0018] The construction method of the water-dispensing snow-melting device of the present invention uses a unique concrete formwork that combines an embedded formwork member and an auxiliary formwork member when placing concrete. After installing the concrete formwork on the construction surface, it is possible to easily and highly accurately adjust the height of the upper end surface of the concrete formwork. Therefore, by adjusting the height of the upper end surface of the concrete formwork to the height of the nozzle and filling and curing the fresh concrete up to the height of the upper end surface of the concrete formwork, the height of the concrete structure and the height of the nozzle can be easily matched.

[0019] In addition, since the main body part of the concrete formwork is an embedded formwork member that does not need to be removed after concrete placement, the construction man-hours are significantly reduced. Furthermore, if the embedded formwork member is manufactured using a 3D printer for civil engineering and architecture, a thin embedded formwork member (mortar board) can be easily manufactured, so that the embedded formwork member can be significantly lightened. Therefore, the transportation of the embedded formwork member to the site becomes easy, and the work load when installing the concrete formwork at the site is also significantly reduced.

[0020] The auxiliary formwork member of the present invention is a member suitable for implementing the construction method of the sprinkler type snow melting device of the present invention. However, it has high versatility and can be used not only for the construction of the sprinkler type snow melting device but also for other purposes. By combining it with the main formwork member that forms the main body part of the formwork for concrete, a formwork for concrete that is easy to adjust the height of the upper end surface and very convenient to use can be obtained. The auxiliary formwork member can be reused many times by being formed of highly durable steel materials or the like.

Brief Description of the Drawings

[0021] [Figure 1] It is a flowchart showing the first embodiment of the construction method of the sprinkler type snow melting device of the present invention. [Figure 2] It is a front view (a), a left side view (b), and a right side view (c) showing the structure of the embedded formwork member prepared in the formwork related member preparation process in FIG. 1. [Figure 3] It is a front view (a), a left side view (b), and a right side view (c) showing the structure of the auxiliary formwork member [an embodiment of the auxiliary formwork member of the present invention] prepared in the formwork related member preparation process in FIG. 1. [Figure 4] It is a front view (a), a left side view (b), and a right side view (c) showing the structure of the formwork for concrete formed by assembling the auxiliary formwork member in FIG. 3 to the embedded formwork member in FIG. 2. [Figure 5] It is a front view (a) and a bottom view (b) showing the structure of the upper connecting member prepared in the formwork related member preparation process in FIG. 1. [Figure 6] It is a front view (a) and a front view (b) showing the structure of the lower connecting member prepared in the formwork related member preparation process in FIG. 1, with the lower connecting member disassembled into a plurality of parts. [Figure 7] It is a longitudinal sectional view (a) to (c) showing an example of the working procedure when performing the formwork for concrete installation process in FIG. 1 in order. [Figure 8] It is a longitudinal sectional view (a) to (c) showing an example of the working procedure when performing the concrete placing process in FIG. 1 in order. <00​ [Figure 10] This flowchart shows a second embodiment of the construction method for the sprinkling snow melting device of the present invention. [Figure 11] Figure 10 shows, in order, an example of the work procedure when performing the pipe trench excavation process, the concrete formwork installation process, and the formwork outer surface support process, as shown in the vertical cross-sectional views (a) to (c). [Figure 12] Figure 10 shows a series of vertical cross-sectional views (a) to (c) illustrating an example of the work procedure when performing the concrete pouring process. [Figure 13] Figure 10 shows a series of longitudinal cross-sectional views (a) and (b) illustrating an example of the work procedure when performing the land leveling process. [Figure 14] (a) is a front view showing one modified example of the lower connecting member, and (b) and (c) are longitudinal cross-sectional views showing two ways of using this lower connecting member. [Figure 15] These are longitudinal cross-sectional views (a) and (b) showing two variations of the work performed in the formwork outer surface support process. [Figure 16] This diagram shows the general flow of the construction method for a conventional sprinkler-type snow melting system, with a vertical cross-section (a) showing the process of pouring concrete inside a pair of concrete formwork, and a vertical cross-section (b) showing the process of removing the concrete formwork and leveling the outer surface of the concrete structure. [Modes for carrying out the invention]

[0022] <<First Embodiment of the Invention>> The following describes a first embodiment of the construction method for the sprinkling snow melting device of the present invention, and an embodiment of the auxiliary formwork member of the present invention, with reference to Figures 1 to 9. In the construction method for the sprinkling snow melting device of the first embodiment, as shown in Figure 1, the formwork-related member preparation step K11, the concrete formwork installation step K12, the concrete pouring step K13, and the ground leveling step K14 are carried out.

[0023] <Formwork-related component preparation process K11> In the formwork-related component preparation process K11, a pair of embedded formwork members 10(1), 10(2), a pair of auxiliary formwork members 12(1), 12(2), an upper connecting member 14, and a lower connecting member 16 are prepared. The embedded formwork member 10(1) is a member used as the main body of the concrete formwork 18(1) described later, and as shown in Figure 2, it is a mortar board with an outer shape that is roughly rectangular. The type of mortar is not particularly limited, but it is preferable to use a mortar that can obtain high strength, such as non-shrink polymer cement mortar. Furthermore, in order to further improve the strength, it is preferable to use a mortar board in which a reinforcing wire mesh 20 is installed inside.

[0024] The embedded formwork member 10(1) has two screw holes 22(1) at its upper end. Here, in order to improve the workability of the concrete formwork member installation process K12 described later, the screw holes 22(1) are elongated slit-shaped holes extending downward from the upper edge of the embedded formwork member 10(1). However, if the workability of process K12 is not a concern, circular holes may be used.

[0025] Furthermore, the embedded formwork member 10(1) is provided with two mounting holes 24(1) at its lower end. Here, in order to improve the workability of the concrete formwork member installation process K12, which will be described later, the mounting holes 24(1) are also elongated slit-shaped holes extending upward from the lower edge of the embedded formwork member 10(1). However, if the workability of process K12 is not a concern, circular holes may be used.

[0026] The embedded formwork member 10(2) is a roughly rectangular mortar board used as the main body of the concrete formwork 18(2) described later, and is the same member as the embedded formwork member 10(1) described above. Hereafter, in order to distinguish it from the embedded formwork member 10(1), the screw holes of the embedded formwork member 10(2) will be denoted as 22(2) and the mounting holes as 24(2).

[0027] Furthermore, since the embedded formwork members 10(1) and 10(2) are used as a pair facing each other in the left-right direction, two screw holes and two mounting holes are provided in symmetrical positions on both sides, as shown in Figure 2(a), so that the same member can be used for both purposes.

[0028] The auxiliary formwork member 12(1) is a member attached to the upper end of the embedded formwork member 10(1) and used as the upper end portion of the concrete formwork 18(1). It is a steel member with approximately the same length as the embedded formwork member 10(1). As shown in Figure 3, the auxiliary formwork member 12(1) comprises a main body portion 12a(1) formed in the shape of a rectangular tube with a roughly rectangular cross-section, a plate-shaped attachment portion 12b(1) extending downward from the lower end of the main body portion 12a(1), and an auxiliary screw hole 26(1) formed in the inner region of the attachment portion 12b(1) that is elongated in the vertical direction when installed.

[0029] The auxiliary screw holes 26(1) are formed in two locations corresponding to the screw holes 22(1) described above. Here, in order to improve the workability of the concrete frame member installation process K12 described later, the auxiliary screw holes 26(1) are made into elongated slit-shaped holes extending upward from the lower edge of the mounting portion 12b(1). However, if workability is not a concern, the lower end may be closed and elongated.

[0030] The main body 12a(1) is made into a hollow rectangular tube shape in order to reduce weight while ensuring the strength of the main body 12a(1). The auxiliary formwork member 12(1) is Auxiliary screw hole 26(1) It can be easily manufactured by methods such as welding a flat steel plate with a surface formed on it to the lower end of a square pipe.

[0031] The auxiliary formwork member 12(2) is attached to the upper end of the embedded formwork member 10(2) and used as the upper end portion of the concrete formwork 18(2), and is the same member as the auxiliary formwork member 12(1) described above. In the following description, in order to distinguish it from the auxiliary formwork member 12(1), the auxiliary formwork member 12(2) is described as follows: Auxiliary screw holesThis is denoted as 26(2). Note that the auxiliary formwork members 12(1) and 12(2) are used as a pair facing each other in the left-right direction, so in order to allow the same member to be used for both, as shown in Figure 3(a), Auxiliary screw holes 26(1), 26(2) They are positioned symmetrically on both sides.

[0032] Figure 4 shows the state in which the auxiliary formwork member 12(1) is temporarily fixed to the embedded formwork member 10(1) and assembled into the concrete formwork 18(1). More specifically, in the concrete formwork 18(1), the main body portion 12a(1) of the auxiliary formwork member 12(1) is positioned at an appropriate location higher than the upper end surface of the embedded formwork member 10(1), the mounting portion 12b(1) is superimposed on the outer side of the embedded formwork member 10(1), and the screw member 28 is inserted with the auxiliary screw hole 26(1) and screw hole 22(1) in communication, and the formwork is temporarily fixed by tightening the screw member 28. The height of the upper end surface 18a(1) of the concrete formwork 18(1) is determined by the height of the main body portion 12a(1) of the auxiliary formwork member 12(1).

[0033] The state in which the auxiliary formwork member 12(2) is temporarily fixed to the embedded formwork member 10(2) and assembled into the concrete formwork 18(2) is the same as that of the concrete formwork 18(1) described above, and the height of the upper end surface 18a(2) of the concrete formwork 18(2) is determined by the height of the main body portion 12a(2) of the auxiliary formwork member 12(2). Although the structure of the concrete formwork 18(1) and 18(2) with the auxiliary formwork member temporarily fixed to the embedded formwork member was explained in the explanation of the formwork-related member preparation process K11, this assembly work may be performed in the formwork-related member preparation process K11 or in the concrete formwork installation process K12 described later.

[0034] The upper connecting member 14 is a member for connecting and fixing the auxiliary formwork members 12(1) and 12(2) to each other in the left-right direction. As shown in Figure 5, formwork holding parts 14b(1) and 14b(2) are provided at both ends of the connecting plate 14a in the longitudinal direction, each consisting of multiple upright pieces 30 that stand upright from the connecting plate 14a and face each other. In addition, a handle 32 that can be gripped by a worker is attached to the upper surface of the connecting plate 14a. The method of using the upper connecting member 14 will be described in the explanation of the concrete formwork installation process K12.

[0035] The lower connecting member 16 is a member for connecting and fixing the embedded formwork members 10(1) and 10(2) to each other in the left-right direction. As shown in Figure 6(a), it consists of a connecting bar 16a and formwork holding fittings 16b(1) and 16b(2) attached to both ends of the connecting bar 16a. Specifically, as shown in Figure 6(b), the connecting bar 16a is a member in which screw grooves 36(1) and 36(2) are formed at both ends of a rod 34, and flange portions 38(1) and 38(2) are formed near the inside of these screw grooves 36(1) and 36(2). The formwork holding fittings 16b(1) and 16b(2) are nuts that are screwed into the screw grooves 36(1) and 36(2). The method of using the lower connecting member 16 will be described in the explanation of the concrete formwork installation process K12.

[0036] <Concrete formwork installation process K12> In the concrete formwork installation process K12, the members prepared in the formwork-related member preparation process K11, as well as the snow-melting members 40 including the water supply pipe 40a and the watering nozzle 40b, are installed on the construction surface 42 at the site, to the state shown in Figure 7(c). The construction surface 42 is the so-called top surface of the foundation, which is a surface where crushed stone for the foundation has been laid and thoroughly compacted with a compactor.

[0037] To briefly explain the snow melting component 40, the snow melting component 40 has a nozzle 40b connected to it. water pipe The 40a is placed inside the reinforcing frame 40c, which is assembled into a roughly rectangular parallelepiped shape, and the nozzle 40b is positioned at an angle that points upward. water pipeThis structure consists of 40a fixed to a reinforced concrete frame 40c. While snow-melting components 40 are typically assembled in a factory and then transported to the site, sometimes the parts are transported to the site and assembled there.

[0038] The following describes an example of the work procedure when performing the concrete formwork installation process K12, based on Figures 7(a) to (c). First, the auxiliary formwork members 12(1) and 12(2) are temporarily fixed to the embedded formwork members 10(1) and 10(2) to form the concrete formwork 18(1) and 18(2) shown in Figure 4. This work may be performed during the concrete formwork installation process K12, or during the formwork-related member preparation process K11 described above.

[0039] Next, the lower ends of the embedded formwork members 10(1) and 10(2) are connected and fixed together with the lower connecting member 16. Specifically, the end of the connecting bar 16a on the screw groove 36(1) side is inserted into the mounting hole 24(1) of the embedded formwork member 10(1), and the formwork holding fitting 16b(1) is screwed into the screw groove 26(1) and tightened firmly, thereby sandwiching the embedded formwork member 10(1) between the flange portion 38(1) and the formwork holding fitting 16b(1). The same operation is performed on the embedded formwork member 10(2), sandwiching the embedded formwork member 10(2) between the flange portion 38(2) and the formwork holding fitting 16b(2). This connects and fixes the lower ends of the concrete formwork 18(1) and 18(2) to each other.

[0040] Then, as shown in Figure 7(a), a pair of concrete formworks 18(1) and 18(2), which are interconnected and fixed to each other, are erected on the construction surface 42, and a connecting bar 16a is installed above the construction surface 42, and the snow melting member 40 is installed on the upper surface of the connecting bar 16a. At this time, the auxiliary formwork members 12(1) and 12(2) and the embedded formwork members 10(1) and 10(2) are in a temporarily fixed state, and the height of the upper end surfaces 18a(1) and 18a(2) of the concrete formworks 18(1) and 18(2) does not match the height of the nozzle 40b.

[0041] Next, the height of the upper end surfaces 18a(1) and 18a(2) of the concrete formwork 18(1) and 18(2) is adjusted. First, the screw member 28 of the concrete formwork 18(1) is loosened so that the screw member 28 is guided by the inner wall (inner wall of the elongated hole) of the auxiliary screw hole 26(1) and can move in the vertical direction. Then, by moving the auxiliary formwork member 12(1) in the vertical direction, the height of the upper end surface 18a(1) is adjusted to the height of the nozzle 40b, and the screw member 28 is tightened to fix the height of the upper end surface 18a(1). Furthermore, the same operation is performed on the concrete formwork 18(2), and when the height of the upper end surface 18a(2) is adjusted to the height of the nozzle 40b, the state shown in Figure 7(b) is achieved.

[0042] Subsequently, the upper ends of the auxiliary formwork members 12(1) and 12(2), which are facing each other on the left and right, are connected and fixed to each other by the upper connecting member 14. Specifically, the upper end of the auxiliary formwork member 12(1) is inserted and fitted between the upright pieces 30 of the formwork holding part 14b(1) of the upper connecting part 14, and the upper end of the auxiliary formwork member 12(2) is inserted and fitted between the upright pieces 30 of the formwork holding part 14b(2) of the upper connecting part 14. This results in the state shown in Figure 7(c), and the concrete formwork installation process K12 is completed.

[0043] It should be noted that the work procedure described above [Figures 7(a)~(c)] is merely an example, and the details and order of the work can be appropriately changed according to the site conditions. Furthermore, the size of the buried formwork members 10(1), 10(2) and auxiliary formwork members 12(1), 12(2) should be approximately 0.5 to 2 m in length each, in order to make them easy for on-site workers to handle and to easily adapt to the site conditions (for example, the undulation and curve size of the road, etc.), and it is preferable to install multiple members in a row along the length.

[0044] <Concrete pouring process K13> Once the concrete formwork installation process K12 is completed, the concrete pouring process K13 is performed. First, as shown in Figure 8(a), ready-mixed concrete 44a is filled inside the pair of concrete formwork 18(1) and 18(2) up to the height of the upper end surfaces 18a(1) and 18(2).

[0045] After leaving it for a while, the upper connecting member 14 is removed when the hardening of the surface layer of the ready-mix concrete 44a has progressed and the outer shape of the ready-mix concrete 44a has been almost established (Figure 8(b)). At this timing, even if the upper connecting member 14 is removed, the concrete formwork 18(1), 18(2) will not be pushed outward by the ready-mix concrete 44a and will not fall over, maintaining the state shown in Figure 8(b). The upper connecting member 14 has a handle 32 on the upper surface of the connecting plate 14a, so the worker can grasp the handle 32 and pull upward to release the engagement between the formwork holding parts 14b(1), 14b(2) and the upper ends of the auxiliary formwork members 12(1), 12(2), and the upper connecting member 14 can be easily removed.

[0046] Then, when the entire ready-mix concrete 44a has hardened and become the concrete structure 44b, the fixing by the screw member 28 is released and the auxiliary formwork members 12(1) and 12(2) are removed. This results in the state shown in Figure 8(c), and the concrete pouring process K13 is completed.

[0047] <Land leveling process K14> The ground leveling process K14 is performed after or in parallel with the concrete pouring process K13. In the ground leveling process K14, as shown in Figure 9(a), soil is piled on the outer side of the embedded formwork members 10(1) and 10(2) erected on the construction surface 42 to form a flat subgrade 46. Furthermore, as shown in Figure 9(b), base course material 48 such as crushed stone or graded crushed stone and asphalt 50 are layered sequentially on top of the subgrade 46 to pave and finish the surface.

[0048] <Summary of the First Embodiment> As described above, the construction method of the sprinkler-type snow melting device of the first embodiment uses a unique concrete formwork 18(1), 18(2) which is a combination of embedded formwork members 10(1), 10(2) and auxiliary formwork members 12(1), 12(2) when pouring concrete. After installing the concrete formwork 18(1), 18(2) on the construction surface 42, it is possible to easily and accurately adjust the height of the upper end surfaces 18a(1), 18a(2) of the concrete formwork 18(1), 18a(2). Therefore, by matching the height of the upper end surfaces 18a(1), 18a(2) to the height of the nozzle 3b, and filling and hardening the ready-mix concrete 44a up to the height of the upper end surfaces 18a(1), 18a(2), the height of the concrete structure 44b and the height of the nozzle 3b can be easily matched. Furthermore, since the main body of the concrete formwork 18(1) and 18(2) is an embedded formwork member 10(1) and 10(2) that does not need to be removed after concrete pouring, the number of construction steps is significantly reduced.

[0049] Generally, the embedded formwork members 10(1) and 10(2) for on-site use are manufactured by creating a custom formwork that matches the external dimensions of the on-site specifications, pouring mortar into the formwork and allowing it to harden to form a mortar base plate, and then adding screw holes 22(1) and 22(2) and mounting holes 24(1) and 24(2) through post-processing. However, it is preferable to manufacture them using a 3D printer for civil engineering and construction, which has been attracting attention in recent years. Using a 3D printer for civil engineering and construction makes it easy to create embedded formwork members (mortar plates) with complex shapes, eliminating the need to manufacture custom formwork or perform post-processing. Furthermore, even if the number of plates used changes, or if the dimensions or shapes of each part are suddenly changed, it is possible to respond flexibly by simply changing the operation program. In addition, using a 3D printer makes it easy to create thin embedded formwork members (mortar plates), which significantly reduces the weight of the embedded formwork members 10(1) and 10(2). Therefore, the transportation of the buried formwork members 10(1) and 10(2) to the site becomes easier, and the workload when installing the concrete formwork 18(1) and 18(2) at the site is also significantly reduced.

[0050] The auxiliary formwork members 12(1) and 12(2) described above are suitable for implementing the sprinkling snow melting device construction method of the present invention, but they are also highly versatile and can be used for purposes other than the construction of sprinkling snow melting devices. By using them in combination with the main formwork member that forms the main body of the concrete formwork (for example, a member like the buried formwork members 10(1) and 10(2) described above), a concrete formwork that is easy to adjust the height of the upper end surface and is easy to use can be obtained. Furthermore, since the auxiliary formwork members 12(1) and 12(2) are made of highly durable steel, they can be reused many times.

[0051] <<Second Embodiment of the Invention>> The second embodiment of the construction method for the sprinkler-type snow melting device of the present invention will be described below with reference to Figures 10 to 13. In the construction method for the sprinkler-type snow melting device of the second embodiment, as shown in Figure 10, the following steps are performed: pipe trench excavation step K21, formwork-related member preparation step K11, concrete formwork installation step K12, formwork outer surface support step K22, concrete pouring step K13, and ground leveling step K14. The difference from the construction method for the sprinkler-type snow melting device of the first embodiment is that the pipe trench excavation step K21 and the formwork outer surface support step K22 have been newly added.

[0052] <Pipe trench excavation process K21> The pipe trench excavation process K21 is performed before the concrete formwork installation process K11. As shown in Figure 11(a), it is a process in which the ground 52 at the site is excavated to form a pipe trench 54, and a construction surface 42 is formed on the bottom surface of the pipe trench 54. The construction surface 42 is the so-called top surface of the foundation, and is a surface on which crushed stone for the foundation has been laid and thoroughly compacted with a compactor.

[0053] <Formwork-related component preparation process K11> The formwork-related member preparation step K11 is the same as the formwork-related member preparation step K11 in the first embodiment described above. <Concrete formwork installation process K12, formwork outer surface support process K22> The concrete formwork installation process K12 is the same as the concrete formwork installation process K12 in the first embodiment described above. Here, as shown in Figures 11(b) and (c), the formwork outer surface support process K22 is performed in parallel with the concrete formwork installation process K12 (before the subsequent concrete pouring process K13).

[0054] The formwork outer surface support process K22 is a process in which backfill soil 56, which is an outer surface support member that supports the concrete formwork 18(1) and 18(2) erected on the construction surface 42, so as not to tip over outwards. For example, the backfill soil 56 may be the soil removed in the pipe trench excavation process K21.

[0055] <Concrete pouring process K13> The concrete pouring process K13 is almost identical to the concrete pouring process of the first embodiment described above, as shown in Figures 12(a) to (c). However, in the second embodiment, since the formwork outer surface support process K13 is performed in advance (the outer surface support member 56 is in place), there is an advantage in that the tolerance range for the timing of removing the upper connecting member 14 is widened.

[0056] In the first embodiment described above, since the formwork outer surface support process K22 is not performed (outer surface support members are not placed), if the removal of the upper connecting member 14 is not performed at a time when the hardening of the ready-mix concrete 44a has progressed and the outer shape of the ready-mix concrete 44a has been almost established, there is a possibility that the concrete formwork 18(1) and 18(2) will fall outward. However, in the second embodiment, since the formwork outer surface support process K22 is performed in advance (outer surface support members are placed), the removal of the upper connecting member 14 can be performed at an appropriate time without waiting for the hardening of the ready-mix concrete 44a to progress. Note that in the concrete pouring process K13, the auxiliary formwork members 12(1) and 12(2) are removed, so care should be taken to position the outer surface support member 56 so as not to interfere with this work.

[0057] <Land leveling process K14> As shown in Figures 13(a) to (c), the formwork-related member preparation step K11 is almost the same as the formwork-related member preparation step K11 of the first embodiment described above.

[0058] <Summary of the second embodiment> As described above, the construction method of the sprinkler-type snow melting device of the second embodiment yields almost the same effects as the first embodiment. Furthermore, because a unique formwork outer surface support process K22 is performed, the tolerance range for the timing of removing the upper connecting member 14 is widened, which has the advantage of eliminating the need for workers to carefully monitor the progress of hardening of the ready-mixed concrete 44a.

[0059] <<Other embodiments and variations>> It should be noted that the construction method for the sprinkler-type snow melting device of the present invention and the auxiliary formwork members that can be used therefor are not limited to the above embodiments. For example, in the embedded formwork members 10(1), 10(2) and auxiliary formwork members 12(1), 12(2), if at least one of the screw holes 22(1), 22(2) and auxiliary screw holes 26(1), 26(2) into which the screw members 28 are inserted is an elongated hole, the vertical positional relationship can be adjusted. Furthermore, this height adjustment structure may be changed to another structure that does not use screw members, as long as it is a structure that is easy to operate.

[0060] The main bodies 12a(1) and 12a(2) of the auxiliary formwork members 12(1) and 12(2) are formed in a rectangular tubular shape with a roughly rectangular cross-section, but can be changed to a different structure as long as conditions such as ensuring the required strength of the main body are met. Furthermore, the upper connecting member is not limited to the configuration of the upper connecting member 14 described above, and can be changed to a different configuration as long as it can detachably connect and fix the pair of auxiliary formwork members.

[0061] The lower connecting member is not limited to the configuration of the lower connecting member 16 described above, and can be changed to any other configuration as long as it can appropriately connect and fix a pair of embedded formwork members. For example, as shown in Figure 14(a), the lower connecting member 58 can be changed to a configuration in which formwork holding parts 58b(1) and 58(2), each consisting of a plurality of upright pieces 60 that stand upright from the connecting plate 58a and face each other, are provided at both ends in the longitudinal direction of the connecting plate 58a (a configuration similar to the upper connecting member 14 described above with the handle 32 removed).

[0062] However, when using the lower connecting member 58, as shown in Figure 14(b), it is preferable to provide a spacer member 62 that can support the snow melting member 40 from below in order to raise the snow melting member 40 away from the construction surface 42. Also, as shown in Figure 14(c), the lower connecting member 58 and the lower connecting member 16 may be used in combination, which allows the pair of embedded formwork members to be connected and fixed more firmly, and other operations in the concrete formwork installation process (for example, the operation of installing the snow melting member 40 on the upper surface of the connecting bar 16a of the lower connecting member 16) to be performed more stably.

[0063] When performing the formwork outer surface support process, the outer surface support member can be a member other than the backfill soil 56 described above. The outer surface support member only needs to be able to support the outer side of a pair of concrete formwork erected on the construction surface so that it does not fall outward when ready-mix concrete is poured, and can be freely changed to suit the site conditions. For example, as shown in Figure 15(a), a pipe support 64 may be used to support the outer side of the concrete formwork at an angle. Also, as shown in Figure 15(b), if there is another structure on the outer side of the concrete formwork, a beam member 66 may be used to support the outer side of the concrete formwork laterally.

[0064] Furthermore, there are no particular restrictions on the condition of the site before construction, and preparatory processes such as the buried pipe excavation process K21 described above may be carried out as needed. Also, the leveling process after the concrete pouring process may be carried out as needed; for example, if the finishing work is to be carried out by another contractor (paving contractor, etc.), the site should be leveled to the extent required by that contractor. [Explanation of Symbols]

[0065] 10(1), 10(2) Buried formwork members 12(1), 12(2) Auxiliary formwork members 12a(1),12a(2) Main body 12b(1), 12b(2) Mounting section 14 Upper connecting member 14a Connecting plate 14b(1), 14b(2) Formwork holding section 16,58 Lower connecting member 16a Connecting bar 16b(1), 16b(2) Formwork holding hardware 18(1), 18(2) Formwork for concrete 18a(1),18a(2) Upper end surface 20 wire mesh 22(1), 22(2) Screw holes 24(1), 24(2) Mounting holes 26(1), 26(2) Auxiliary screw holes 28 Screw component 30 Standing piece 40 Snow melting components 40a water pipe 40b Nozzle 42 Construction side 44a Ready-mix concrete 44b Concrete structure (hardened ready-mix concrete) 46 Roadbed 48 Roadbed material 50 Asphalt 52 Ground 54 Pipe groove 56. Backfill soil (external support member) 64 Pipe support (external support member) 66 Beam member (outer support member) K11 Formwork-related component preparation process K12 Concrete formwork installation process K13 Concrete pouring process K14 Land leveling process K21 Pipe trench excavation process K22 Formwork Outer Surface Support Process

Claims

1. In a method for constructing a sprinkler-type snow melting device in which a water supply pipe and multiple nozzles are buried underground, and water from the water supply pipe is released onto the ground surface from the nozzles to melt snow, A formwork-related member preparation step, which involves preparing a member used as the main body portion of a concrete formwork erected in pairs on the left and right, a pair of embedded formwork members made of rectangular mortar boards, a pair of auxiliary formwork members attached to the upper ends of the pair of embedded formwork members and used as the upper end portion of the concrete formwork, the height of the upper end surface of the concrete formwork being adjustable by adjusting the attachment height to the embedded formwork members, an upper connecting member for connecting and fixing the pair of auxiliary formwork members to each other in the left-right direction, and a lower connecting member for connecting and fixing the pair of embedded formwork members to each other in the left-right direction, A concrete formwork installation step comprising: installing the members prepared in the formwork-related member preparation step and the snow-melting member including the water supply pipe and the nozzle on the construction surface of the site, wherein the concrete formwork is formed by the buried formwork member and the auxiliary formwork member, the concrete formwork is erected in pairs on the left and right sides on the construction surface, the snow-melting member is installed in the space between the pair of concrete formwork, the pair of concrete formwork is connected and fixed to each other by the upper connecting member and the lower connecting member, and the mounting height of the auxiliary formwork member to the buried formwork member is adjusted so that the height of the upper end surface of the concrete formwork is set to the height of the nozzle, A method for constructing a sprinkler-type snow melting device, comprising a concrete pouring step of filling the inside of a pair of concrete formworks with ready-mix concrete up to the height of the upper end surface of the concrete formworks and allowing it to harden, and removing the upper connecting member and the auxiliary formwork member at a predetermined timing.

2. The auxiliary formwork member comprises a main body, a plate-shaped mounting portion extending downward from the lower end of the main body, and auxiliary screw holes formed in the inner region of the mounting portion. The embedded formwork member has screw holes formed at positions corresponding to the auxiliary screw holes, At least one of the auxiliary screw holes in the auxiliary formwork member and the screw holes in the embedded formwork member is an elongated hole that is longer in the vertical direction when installed. In the concrete formwork installation step, the mounting portion of the auxiliary formwork member is superimposed on the outer surface of the embedded formwork member, a screw member is inserted so that the auxiliary screw hole and the screw hole are in communication, the screw member is guided by the inner wall of the elongated hole so that it can move in the vertical direction, the height of the upper end surface of the concrete formwork is adjusted by moving the auxiliary formwork member in the vertical direction, and the height of the upper end surface of the concrete formwork is fixed by tightening the screw member, the method for installing a sprinkler-type snow melting device according to claim 1.

3. The method for constructing a sprinkler-type snow melting device according to claim 1 or 2, wherein the buried formwork member is manufactured using a 3D printer.

4. The method for constructing a sprinkler-type snow melting device according to claim 1 or 2, wherein the buried formwork member is a mortar board with reinforcing wire mesh installed inside.

5. A method for constructing a sprinkler-type snow melting device according to claim 1 or 2, comprising a formwork outer surface support step, which is performed before the concrete pouring step, and includes an outer surface support member that supports the concrete formwork so that it does not fall outward when the ready-mix concrete is poured onto the outer surface of a pair of concrete formwork erected on the construction surface.

6. A method for constructing a sprinkler-type snow melting device according to claim 1 or 2, comprising a step performed after or in parallel with the concrete formwork installation step, wherein a leveling step is performed to form a flat roadbed on the outer surface side of the embedded formwork member erected on the construction surface.

7. The method for constructing a sprinkler-type snow melting device according to claim 6, wherein in the ground leveling step, a base course material and asphalt are sequentially laid on the subgrade to pave the area.

8. The aforementioned embedded formwork member has mounting holes formed at predetermined positions in the inner region. The lower connecting member comprises a connecting bar and formwork holding fittings attached to both ends of the connecting bar. In the concrete formwork installation step, the ends of the connecting bar are inserted through the mounting holes of each of the buried formwork members, and each of the buried formwork members is positioned on both ends of the connecting bar using the formwork holding fittings, thereby connecting and fixing a pair of the buried formwork members to each other, and the snow melting member is installed on the upper surface of the connecting bar which is erected above the construction surface, as described in claim 1 or 2.

9. The upper connecting member is provided with formwork holding portions at both ends in the longitudinal direction of the connecting plate, each consisting of a plurality of upright pieces that stand up from the connecting plate and face each other. In the concrete formwork installation process, the upper ends of each auxiliary formwork member are inserted and fitted between the multiple upright pieces, thereby connecting and fixing a pair of the auxiliary formwork members to each other. In the concrete pouring step, the upper connecting member is pulled upward and the upper connecting member is removed from the auxiliary formwork member by releasing the engagement between the formwork holding part and the upper end of each auxiliary formwork member, in the method of constructing a sprinkler-type snow melting device according to claim 1 or 2.

10. A member that is attached to the upper end of a plate-shaped main formwork member, which is the main body of a concrete formwork, and is used as the upper end portion of the concrete formwork, It comprises a main body, a plate-shaped mounting portion extending downward from the lower end of the main body, and auxiliary screw holes formed in the inner region of the mounting portion. The opposing main formwork member has screw holes formed at positions corresponding to the auxiliary screw holes. At least one of the auxiliary screw holes in the mounting portion and the screw holes in the main formwork member is an elongated hole that is longer in the vertical direction when installed. An auxiliary formwork member characterized in that the mounting portion is superimposed on the outer surface of the main formwork member, a screw member is inserted so that the screw hole of the main formwork member and the auxiliary screw hole are in communication, the screw member is guided by the inner wall of the elongated hole so that it can move in the vertical direction, the height of the upper end surface of the concrete formwork can be adjusted by moving the main body portion and the mounting portion in the vertical direction, and the height of the upper end surface of the concrete formwork can be fixed by tightening the screw member.

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