Formwork forming aid, formwork forming apparatus, and formwork installation structure

Abstract

To provide a formwork forming aid, a formwork forming apparatus, and a formwork installation structure that enable easy installation of formwork. [Solution] The formwork forming aid 30 comprises a spacing determination member 31 and a formwork plate connecting member 41. The spacing determination member 31 has a pair of opposing straight sections 32 spaced wider than the outer diameter of the protective pipe, and a connecting section 33 that connects the ends of the pair of straight sections 32. The formwork plate connecting member 41 has a plate-shaped base 43, a pair of grooves 47 that open in opposite directions on either side of the base 43 and extend parallel to each other, into which the edge portions of the formwork plates can be fitted, and an attachment section 49 for attaching the straight sections 32 to the base 43. The formwork forming aid 30 makes it possible to determine the spacing between the pair of formwork plate connecting members 41 using the spacing determination member 31 by attaching each of the pair of straight sections 32 to the base 43 using the attachment section 49.

Description

Technical Field

[0001] The present invention relates to a formwork forming aid, a formwork forming apparatus, and a formwork installation structure.

Background Art

[0002] For example, in a road, pipes are laid below an asphalt pavement surface that forms a road surface (see, for example, Patent Document 1). Wires such as power transmission cables and communication cables are inserted through the pipes, and the pipes protect the wires. The pipes are embedded in protective concrete formed below the asphalt pavement surface. And the protective concrete prevents the pipes from being crushed by the load of vehicles traveling on the road.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The protective concrete is formed by placing concrete between the formworks after the formworks are installed, but the installation of the formworks is troublesome.

Means for Solving the Problems

[0005] The formwork forming aid for solving the above problems is a formwork forming aid used to assist in the installation of formwork for protective concrete that protects buried pipes, and is used to install formwork plates that are arranged to face each other radially across the pipes in order to form the formwork. The aid comprises a U-shaped spacing determination member having a pair of straight sections that face each other at a distance wider than the outer diameter of the pipes and a connecting portion that connects the ends of the pair of straight sections, and a formwork plate connecting member having a plate-shaped base, a pair of grooves that open in opposite directions on either side of the base and extend parallel to each other so as to be able to fit the edge of the formwork plate, and a mounting portion that attaches the straight sections to the base. The gist of the aid is that by attaching each of the pair of straight sections to the base using the mounting portion, the spacing between the pair of formwork plate connecting members can be determined by the spacing determination member.

[0006] In the formwork forming aid, the spacing determining member is formed by bending a rod-shaped body into the U-shape, and the mounting portion is a separate member from the formwork plate connecting member, and consists of a holding member that holds the straight portion and a mounting hole provided in the base for attaching the holding member, and the mounting hole may be formed in multiple locations so that the holding member can be attached in different positions, or so that multiple holding members can be attached.

[0007] A formwork forming apparatus for solving the above problems is a formwork forming apparatus used to form a formwork for protective concrete that protects buried pipes, and comprises a formwork plate that forms the formwork and is arranged to face the pipes radially, and a formwork forming aid used to assist in the installation of the formwork, wherein the formwork forming aid has a pair of straight sections facing each other at a distance wider than the outer diameter of the pipes, and a U-shaped spacing determining member having a connecting portion that connects the ends of the pair of straight sections, and a plate-shaped base, with openings on either side of the base and on opposite sides. The gist of the invention is that a formwork support is formed by assembling a pair of the formwork support members and the spacing determination member, each having a formwork board connecting member that extends in a row and has a pair of grooves into which the edge portions of the formwork board can be fitted, and a mounting portion for attaching the straight portion to the base, and a plurality of these formwork support members are arranged spaced apart in the laying direction of the pipe material, the edge portions of the formwork boards are fitted into the grooves that are adjacent to each other in the laying direction and open to each other, the formwork boards are arranged in opposing directions perpendicular to the laying direction with the pipe material in between, and a plurality of the formwork boards extending in the laying direction form a formwork wall facing the opposing direction.

[0008] With respect to the formwork forming apparatus, the formwork plate connecting members of the formwork support members adjacent to each other in the laying direction may be connected in the laying direction by a connecting device. The formwork forming apparatus comprises a rod-shaped connecting rod extending linearly in the laying direction, a holding portion for holding the connecting rod, and a holding member for the connecting apparatus which is integrated with the holding portion and has an assembly portion that is assembled to the base, and the holding member for the connecting apparatus may be capable of holding the connecting rod in a state along the surface of the formwork plate.

[0009] Regarding the formwork forming apparatus, the base portion has a mounting section to which a mounting member is attached, which is erected on a pair of formwork plate connecting members facing each other in the opposing direction and embedded in the protective concrete, and the mounting section may be provided at a position above the pipe material to which the mounting member can be attached.

[0010] Regarding the formwork forming apparatus, the base portion has a mounting section to which a mounting member is attached, which is erected on a pair of formwork plate connecting members facing each other in the opposing direction and embedded in the protective concrete. The mounting section may be located above the pipe material and in a position that allows the mounting member to be attached at multiple locations.

[0011] A formwork installation structure for solving the above problems is a formwork installation structure for installing formwork to form protective concrete that protects buried pipes, comprising: a formwork plate that forms the formwork and is arranged to face the pipes radially; and a formwork forming aid used to assist in the installation of the formwork, wherein the formwork forming aid has a pair of straight sections facing each other at a distance wider than the outer diameter of the pipes, and a U-shaped spacing determining member having a connecting portion that connects the ends of the pair of straight sections; and a plate-shaped base having a pair of grooves that open in opposite directions on either side of the base and extend parallel to each other, into which the edge portions of the formwork plate can be fitted. The gist of the present invention is that a formwork support is formed by assembling a pair of the formwork board connecting members and a spacing determining member, and a plurality of these formwork support members are arranged spaced apart in the laying direction of the pipe material, the pipe material is positioned above the plurality of connecting parts, the edge portions of the formwork boards are fitted into grooves that are adjacent to each other and open to each other in the laying direction, the formwork boards are arranged sandwiching the pipe material in opposing directions perpendicular to the laying direction, and a pair of formwork walls extending in the laying direction are formed by the plurality of formwork boards extending in the laying direction.

[0012] The formwork installation structure may have a frame member that is erected on a pair of formwork plate connecting members facing each other in the opposing directions, and that is located above the pipe material laid above the connecting portion and crosses in the opposing directions.

[0013] Regarding the formwork installation structure, the two formwork connecting members sandwiching one of the formwork plates are connected in the laying direction of the pipe by a rod-shaped connecting bar that extends linearly, and the ends of the connecting bar may be joined to the ends of other connecting bars adjacent in the laying direction of the pipe.

Advantages of the Invention

[0014] The present invention enables easy installation of the formwork.

Brief Description of the Drawings

[0015] [Figure 1] FIG. 1 is a cross-sectional view showing protective concrete, a protective pipe, and the ground. [Figure 2] FIG. 2 is a perspective view showing a formwork forming device and a formwork installation structure. [Figure 3] FIG. 3 is an exploded perspective view showing a formwork plate connecting member and a holding member. [Figure 4] FIG. 4 is a plan view showing a formwork plate connecting member. [Figure 5] FIG. 5 is a perspective view showing a formwork forming auxiliary tool and a formwork support tool. [Figure 6] FIG. 6 is a side view showing a formwork forming auxiliary tool and a formwork support tool. [Figure 7] FIG. 7 is a perspective view showing a holding member. [Figure 8] FIG. 8 is a perspective view of a state where formwork support tools are installed at intervals in the laying direction. [Figure 9] FIG. 9 is a perspective view of a state where formwork plates are connected by formwork plate connecting members. [Figure 10] FIG. 10 is a perspective view of a state where formwork plate connecting members are connected to each other by a connecting device. [Figure 11] FIG. 11 is a perspective view of a state where support reinforcing bars are installed. [Figure 12] FIG. 12 is a perspective view of a state where pipe floating prevention reinforcing bars are installed.

Embodiments for Carrying Out the Invention

[0016] Hereinafter, an embodiment in which a formwork forming aid, a formwork forming device, and a formwork installation structure are embodied will be described in accordance with FIGS. 1 to 12. <Road> As shown in FIG. 1, a protective concrete 13 is embedded in a ground 12 paved with asphalt 11. The road surface is formed by an asphalt pavement surface 11a. A protective pipe 14 as a pipe material is embedded in the protective concrete 13. Therefore, the protective concrete 13 protects the protective pipe 14 to be embedded. Wiring 15 such as a power transmission cable or a communication cable is inserted into the protective pipe 14. In addition, examples of the pipe material include a water pipe and a gas pipe in addition to the protective pipe 14. A protective plate 16 is installed between the protective concrete 13 and the asphalt 11. The protective concrete 13 is formed using a formwork.

[0017] <Formwork forming device> As shown in FIG. 2, the formwork 20 is formed by a pair of formwork walls W extending in the laying direction H of the protective pipe 14. The pair of formwork walls W are formed using a formwork forming device 21. Therefore, the formwork forming device 21 is used to form the formwork 20 of the protective concrete 13 when forming the protective concrete 13 that protects the protective pipe 14 to be embedded. The formwork forming device 21 includes a plurality of formwork plates 23 and a plurality of formwork forming aids 30. The plurality of formwork plates 23 form the formwork 20 and are arranged so as to face each other with the protective pipe 14 to be laid sandwiched in the radial direction. The plurality of formwork forming aids 30 are used to install the formwork plates 23. Further, the formwork forming device 21 is formed using a plurality of formwork supports 70 formed using the formwork forming aids 30.

[0018] <Formwork forming aid> The formwork forming aid 30 includes a U-shaped spacing determining member 31 and a substantially plate-shaped formwork plate connecting member 41. The formwork plate connecting member 41 has a mounting portion 49.

[0019] <Spacing determining member> As shown in Figures 5 and 6, the spacing determination member 31 is formed by bending a rod-shaped body into a U-shape. The spacing determination member 31 is made of reinforcing steel of the required thickness. Specifically, the spacing determination member 31 is made of 3 / 8 inch or 4 / 8 inch reinforcing steel. The spacing determination member 31 has a pair of straight sections 32 and a connecting section 33 that connects the ends of the pair of straight sections 32. In the spacing determination member 31, the part connecting the straight sections 32 and the connecting section 33 may be at a right angle or curved. Even if the part connecting the straight sections 32 and the connecting section 33 is not at a right angle, the spacing determination member 31 is U-shaped. The length of the pair of straight sections 32 is the same. The connecting section 33 connects one end of the pair of straight sections 32. When the connecting section 33 is placed on a horizontal plane, the other ends of the pair of straight sections 32 are at the same height. The pair of straight sections 32 are separated by the length of the connecting section 33. The length of the connecting portion 33 is between three and four times the outer diameter of the protective tube 14. Therefore, the pair of straight sections 32 face each other in the longitudinal direction of the connecting portion 33 at a distance wider than the outer diameter of the protective tube 14. Accordingly, the spacing determining member 31 is U-shaped and has a pair of straight sections 32 that face each other at a distance wider than the outer diameter of the protective tube 14, as well as a connecting portion 33 that connects the ends of the pair of straight sections 32.

[0020] <Formwork board connecting member> As shown in Figure 3, the formwork plate connecting member 41 is formed by shaping a rectangular metal plate 42. The dashed line in Figure 3 shows the metal plate 42 before shaping. The longitudinal direction of the metal plate 42 is defined as the first direction X of the formwork plate connecting member 41, and the transverse direction of the metal plate 42 is defined as the second direction Y. The dimension of the formwork plate connecting member 41 in the first direction X is the same as or approximately the same as the dimension of the formwork plate 23 in the transverse direction.

[0021] As shown in Figures 3 and 4, the formwork plate connecting member 41 has a base portion 43, a first groove forming portion 44 divided in a first direction X, and a second groove forming portion 45 located between the first groove forming portions 44. The formwork plate connecting member 41 also has a plurality of erection portions 43a, and the formwork plate connecting member 41 has an attachment portion 49 provided on the base portion 43. The formwork plate connecting member 41 has a first plate surface 41a and a second plate surface 41b that are opposite to each other in the plate thickness direction. Each of the first plate surface 41a and the second plate surface 41b is a flat surface.

[0022] The base portion 43 is an elongated rectangular plate that extends along the entire length of the formwork plate connecting member 41 in the first direction X. The first groove forming portions 44 are provided at both ends of the base portion 43 in the first direction X. The first groove forming portions 44 are spaced apart in the first direction X of the formwork plate connecting member 41. Each first groove forming portion 44 extends on both sides of the base portion 43 in the second direction Y. Specifically, each first groove forming portion 44 protrudes in the second direction Y in the shape of an elongated rectangular plate. The base portion 43 and the first groove forming portions 44 are located on the same plane on the first plate surface 41a and the second plate surface 41b, respectively.

[0023] The second groove-forming portion 45 is provided between the first groove-forming portions 44 which are divided in the first direction X, and extends on both sides in the second direction Y from the base portion 43. Each second groove-forming portion 45 extending in the second direction Y has an extending wall 45a that extends perpendicular to the base portion 43 and a retaining wall 45b that extends perpendicular to the extending wall 45a. Each extending wall 45a extends from the first plate surface 41a of the formwork plate connecting member 41. The two extending walls 45a are parallel to each other. Each second groove-forming portion 45 is formed in the metal plate 42 by cutting and raising the portion between the first groove-forming portions 44 which are divided in the first direction X in an L shape. Therefore, a gap is defined between the first groove-forming portions 44 which are divided in the first direction X. Also, the two second groove-forming portions 45 extend parallel to each other in the first direction X.

[0024] When viewing the formwork plate connecting member 41 in the first direction X, the shortest distance L between the first plate surface 41a at the first groove forming portion 44 and the second plate surface 41b at the retaining wall 45b is slightly longer than the plate thickness D of the formwork plate 23.

[0025] The extension length of the retaining wall 45b from the extending wall 45a in the second direction Y is slightly shorter than the extension length of the first groove forming portion 44 from the base portion 43 in the second direction Y. Therefore, when viewing the formwork plate connecting member 41 from the second groove forming portion 45 side in the thickness direction, the first groove forming portion 44 protrudes more in the second direction Y than the retaining wall 45b. In other words, when viewing the formwork plate connecting member 41 from the second groove forming portion 45 side in the thickness direction, the retaining wall 45b is recessed in the second direction Y than the first groove forming portion 44.

[0026] The formwork plate connecting member 41 is divided into a pair of grooves 47. Specifically, in the formwork plate connecting member 41, on both sides in the second direction Y, the first groove forming portion 44 sandwiches the second groove forming portion 45 in the first direction X, so that grooves 47 are formed on both sides in the second direction Y by the cooperation of the first groove forming portion 44 and the second groove forming portion 45.

[0027] Therefore, the pair of grooves 47 are defined outside the base 43 in the second direction Y. Each groove 47 is formed by a first groove forming section 44 divided in the first direction X, and a second groove forming section 45 between the first groove forming sections 44. When viewing the formwork plate connecting member 41 from the second groove forming section 45 side in the thickness direction, the first groove forming section 44 and the second groove forming section 45 are aligned in the first direction X. For this reason, the first groove forming section 44 and the second groove forming section 45 are not facing each other in the thickness direction of the base 43. Therefore, when viewing the formwork plate connecting member 41 from the first direction X, each groove 47 is formed in a groove shape by the first groove forming section 44 and the second groove forming section 45. Consequently, each of the pair of grooves 47 is U-shaped when viewing the formwork plate connecting member 41 in the first direction X, and is defined outside the base 43 in the second direction Y. The pair of grooves 47 open in opposite directions, sandwiching the base 43 in the second direction Y. Also, since the two second groove-forming portions 45 extend parallel to each other in the first direction X, the pair of grooves 47 formed using the second groove-forming portions 45 also extend parallel to each other in the first direction X.

[0028] As described above, the shortest distance between the first plate surface 41a in the first groove forming section 44 and the second plate surface 41b in the retaining wall 45b is also L. The shortest distance L is slightly larger than the plate thickness D of the formwork plate 23. For this reason, the edge portion 23a located at the longitudinal end of the formwork plate 23 can be fitted into each groove 47. Thus, the grooves 47 open in opposite directions on either side of the base 43 and extend parallel to each other, allowing the edge portion 23a of the formwork plate 23 to be fitted into them.

[0029] As shown in Figures 3 and 5, multiple erection sections 43a are provided in the first direction X of the base 43. The multiple erection sections 43a are arranged at equal intervals in the first direction X. Each erection section 43a is an elongated hole with its longitudinal side extending in the second direction Y of the formwork plate connecting member 41. The longitudinal dimension of the erection section 43a is slightly larger than twice the diameter of the straight section 32. Of the multiple erection sections 43a, the erection sections 43a located at both ends in the first direction X are designated as the outermost erection sections 431. The formwork plate connecting member 41 has two outermost erection sections 431. Furthermore, each erection section 43a is capable of having an erection member 90, which will be erected on a pair of formwork plate connecting members 41 facing each other in opposing directions and embedded in the protective concrete 13. Furthermore, the erection section 43a is provided in the base 43 at a position that allows for the attachment of the erection members 90 at multiple locations. Specifically, the erection section 43a is provided in the base 43 at a position that allows for the attachment of the erection members 90 at multiple locations that differ in the vertical direction.

[0030] The base portion 43 is provided with first mounting holes 43b located inward in the first direction X from each outermost mounting portion 431. Therefore, the base portion 43 is provided with two first mounting holes 43b. The two first mounting holes 43b are located at the same position on the base portion 43 in the second direction Y. For this reason, the two first mounting holes 43b are located in positions aligned in the first direction X.

[0031] Each first mounting hole 43b is formed by two holes spaced apart in the second direction Y. One of the two holes in the first mounting hole 43b is square-shaped, and the other is round-shaped. The base 43 is also provided with second mounting holes 43c, which are positioned in the second direction Y relative to each outermost mounting portion 431. Therefore, the base 43 has two second mounting holes 43c. Each second mounting hole 43c is formed by two holes spaced apart in the first direction X. One of the two holes in the second mounting hole 43c is square-shaped, and the other is round-shaped.

[0032] <Mounting part> The mounting portion 49 is provided for attaching the straight portion 32 of the spacing determination member 31 to the base portion 43. The mounting portion 49 consists of a holding member 50 for holding the straight portion 32 and a first mounting hole 43b provided in the base portion 43 for attaching the holding member 50. The holding member 50 is a separate component from the formwork plate connecting member 41.

[0033] As shown in Figure 7, the retaining member 50 has an assembly portion 51 and a retaining portion 56 that face each other, and a biasing portion 60 that connects the assembly portion 51 and the retaining portion 56 and biases them in a direction that brings them closer together.

[0034] The assembly section 51 includes an elongated plate-shaped assembly substrate 52, a pair of positioning plates 53 protruding from a pair of long edges of the assembly substrate 52 (only one is shown in Figure 7), a projection 54 protruding from one end of the assembly substrate 52 in the longitudinal direction, and a first insertion hole 55 provided on the other end of the assembly substrate 52 in the longitudinal direction.

[0035] In the longitudinal direction of the mounting substrate 52, the distance between the projection 54 and the first insertion hole 55 is approximately the same as the distance between the two holes of the first mounting hole 43b and the distance between the two holes of the second mounting hole 43c. Therefore, when the projection 54 is inserted into the square-shaped hole of the first mounting hole 43b, the first insertion hole 55 can be positioned opposite the round-shaped hole. Similarly, when the projection 54 is inserted into the square-shaped hole of the second mounting hole 43c, the first insertion hole 55 can be positioned opposite the round-shaped hole.

[0036] The pair of positioning plates 53 are elongated plates that extend in the longitudinal direction of the assembly substrate 52. Furthermore, the pair of positioning plates 53 are provided near the first insertion hole 55 in the longitudinal direction of the assembly substrate 52. Therefore, a portion of the assembly substrate 52 on the side of the projection 54 does not have a positioning plate 53. Each of the pair of positioning plates 53 has a positioning edge 52a at the edge near the projection 54 in the longitudinal direction. The positioning edge 52a is formed to rise in an arc from the assembly substrate 52 in the longitudinal direction of the assembly substrate 52, from the projection 54 side toward the first insertion hole 55 side.

[0037] The retaining portion 56 includes an elongated plate-shaped retaining substrate 57, a pair of retaining plate portions 58 protruding from a pair of long edges of the retaining substrate 57, and a second insertion hole 59 provided in the retaining substrate 57 at a position opposite to the first insertion hole 55. The pair of retaining plate portions 58 are elongated plates that extend along the entire longitudinal direction of the retaining substrate 57. Each of the pair of retaining plate portions 58 has a retaining recess 58a on the side opposite to the second insertion hole 59. The retaining recess 58a is recessed in a semicircular shape toward the retaining substrate 57 from the edge of the retaining plate portion 58 opposite to the retaining substrate 57. The positioning edge 52a and the retaining recess 58a are opposite each other.

[0038] The biasing portion 60 connects the ends of the assembly substrate 52 and the holding substrate 57 on the sides of the first insertion hole 55 and the second insertion hole 59, respectively, in their respective longitudinal directions. The biasing portion 60 also biases the assembly portion 51 and the holding portion 56 in a direction that narrows the distance between them. The direction in which the distance between the assembly portion 51 and the holding portion 56 is narrowed coincides with the direction in which the distance between the assembly substrate 52 and the holding substrate 57 is narrowed. The assembly portion 51 and the holding portion 56 are elastically deformable in a direction that widens the distance between them, against the biasing force of the biasing portion 60.

[0039] As shown in Figure 3, the retaining member 50 is capable of having a screw 62 inserted through the first insertion hole 55 and the second insertion hole 59. By inserting this screw 62 through the first mounting hole 43b or the second mounting hole 43c and screwing it into the retaining member 50, the retaining member 50 is attached to the base 43.

[0040] As described above, there are two first mounting holes 43b in the base 43. Therefore, multiple first mounting holes 43b are provided so that the retaining member 50 can be mounted in different positions, or so that two retaining members 50 can be mounted to the base 43.

[0041] <Formwork support> The formwork support 70 is formed by assembling a pair of formwork plate connecting members 41 and a single spacing determining member 31.

[0042] The manufacturing method of the formwork support 70 will be explained along with the operation of the formwork forming aid 30. Prepare a pair of formwork board connecting members 41, one spacing determining member 31, four holding members 50, and four screws 62.

[0043] First, two retaining members 50 are attached to each formwork plate connecting member 41. The worker positions each retaining member 50 on the first plate surface 41a side of the base 43 and inserts the projection 54 into the square-shaped hole of each first mounting hole 43b. Next, as shown in Figure 3, the worker inserts the screw 62, which has been inserted into the round-shaped hole of each first mounting hole 43b, from the second plate surface 41b side of the base 43, through the first insertion hole 55 and the second insertion hole 59, and forcibly screws it into the retaining part 56 in the second insertion hole 59. In this way, each of the two retaining members 50 is attached to the base 43. The two retaining members 50 are attached to the formwork plate connecting member 41 in a position aligned in the first direction X, and with the projection 54 sides facing the same direction.

[0044] Next, the straight section 32 of the spacing determination member 31 is held by the two holding members 50. The worker presses one straight section 32 of the spacing determination member 31 against the two holding members 50 from the projection 54 side. As a result, the gap between the assembly section 51 and the holding section 56 of each holding member 50 is widened against the biasing force of the biasing section 60, and the gap between the assembly substrate 52 and the holding substrate 57 is widened. Furthermore, when the worker presses the straight section 32 toward the holding member 50, a part of the straight section 32 is inserted into the holding recess 58a. Subsequently, the return force of the widened biasing section 60 to its original shape returns the gap between the assembly section 51 and the holding section 56 to its state before widening. As a result, the gap between the assembly section 51 and the holding section 56 narrows, and the straight section 32 is held inside the holding recess 58a. At this time, the positioning edge 52a contacts the straight section 32 from the opening side of the holding recess 58a, and the assembly substrate 52 is pressed against the straight section 32. As a result, the straight section 32 is held between each holding member 50, and the spacing determination member 31 is attached to the formwork plate connecting member 41 by the two holding members 50. Note that the operation of widening the gap between the assembly portion 51 and the holding portion 56 of each holding member 50 may be performed manually by an operator, rather than by pressing the straight section 32 against the holding member 50.

[0045] Therefore, the mounting portion 49 is a separate component from the formwork board connecting member 41 and consists of a retaining member 50 that holds the straight portion 32 and a first mounting hole 43b provided in the base portion 43 for attaching the retaining member 50. Two first mounting holes 43b are formed in the base portion 43 so that two retaining members 50 can be attached. Thus, the straight portion 32 is attached to the formwork board connecting member 41 by the two retaining members 50. The formwork board connecting member 41 also has a mounting portion 49 for attaching the straight portion 32 to the base portion 43.

[0046] Similarly, the worker attaches the straight section 32 to the other formwork board connecting member 41 using the holding member 50. Then, the pair of formwork board connecting members 41 and one spacing determination member 31 are assembled together using the four holding members 50 and four screws 62. The pair of formwork board connecting members 41 and one spacing determination member 31 are then assembled to form a set of formwork support members 70.

[0047] As shown in Figure 5, the formwork support 70 has a spacing determination member 31 that keeps the spacing between the first plate surfaces 41a of the formwork plate connecting members 41 constant. The spacing between a pair of formwork plate connecting members 41 is determined by the length of the connecting portion 33 of the spacing determination member 31. As described above, the length of the connecting portion 33 is 3 times or more but less than 4 times the outer diameter of the protective pipe 14. Therefore, the spacing between a pair of formwork plate connecting members 41 is determined to be 3 times or more but less than 4 times the outer diameter of the protective pipe 14. Accordingly, the formwork forming aid 30 allows the spacing between a pair of formwork plate connecting members 41 to be determined by the spacing determination member 31 by attaching each of the pair of straight portions 32 to the base portion 43 using the mounting portion 49.

[0048] In the formwork support 70, the lower edge of the connecting portion 33 of the spacing determination member 31 is positioned on the same plane as the lower edge of the pair of formwork plate connecting members 41, and the upper ends of each straight portion 32 of the spacing determination member 31 are positioned on the same plane as the upper edge of the pair of formwork plate connecting members 41. In the formwork support 70, the groove portion 47 of each formwork plate connecting member 41 opens on both sides in the second direction Y, centered on the straight portion 32.

[0049] <Formwork forming device> Next, the formwork forming apparatus 21 will be described. As shown in Figure 2, the formwork forming apparatus 21 includes a plurality of formwork plates 23 and a plurality of formwork support members 70. The formwork forming apparatus 21 also includes a connecting device 80 that connects formwork plate connecting members 41 of adjacent formwork support members 70 in the laying direction H. Furthermore, the formwork forming apparatus 21 includes a support member 90 that is attached to the base 43 by a support section 43a.

[0050] <Connection device> The connecting device 80 includes a long, rod-shaped connecting rod 81 extending linearly in the laying direction H, and the aforementioned holding member 50. The holding member 50 used in the connecting device 80 will be referred to as the holding member 501 for the connecting device. The configuration of the holding member 50 and the holding member 501 for the connecting device are the same.

[0051] The connecting rod 81 is a reinforcing bar that extends linearly in the laying direction H of the protective pipe 14. Specifically, the connecting rod 81 is made of 3 / 8 inch or 4 / 8 inch reinforcing bar. The holding member 501 for the connecting device is capable of holding the connecting rod 81 inside the holding recess 58a of the holding portion 56. Therefore, the holding member 501 for the connecting device has a holding portion 56 for holding the connecting rod 81, and an assembly portion 51 that is integral with the holding portion 56 and is assembled to the base portion 43.

[0052] <Erection components> The erection member 90 includes a support bar 91 and a pipe float prevention bar 92. Each of the support bar 91 and the pipe float prevention bar 92 is made of rod-shaped reinforcing bars. Specifically, each of the support bar 91 and the pipe float prevention bar 92 is made of 3 / 8 inch or 4 / 8 inch reinforcing bars. The diameter of the support bar 91 and the diameter of the pipe float prevention bar 92 are the same as or approximately the same as the diameter of the spacing determination member 31, but may be different. The length of the support bar 91 and the pipe float prevention bar 92 is longer than the length of the connection part 33. That is, the length of the support bar 91 and the pipe float prevention bar 92 is at least three times the outer diameter of the protective pipe 14. Each of the support bar 91 and the pipe float prevention bar 92 can be inserted into the erection part 43a of the formwork plate connecting member 41. In other words, both the dimension in the first direction X and the dimension in the second direction Y of the erection section 43a are larger than the diameters of the supporting reinforcement bars 91 and the pipe floating prevention reinforcement bars 92.

[0053] <Method for manufacturing a formwork forming apparatus> As shown in Figure 8, multiple formwork supports 70 are arranged spaced apart in the laying direction H of the protective pipe 14. The laying direction H of the protective pipe 14 is the direction in which the protective pipe 14 extends. The protective pipe 14 may meander slightly, but the laying direction H of the protective pipe 14 is assumed to be straight.

[0054] Multiple formwork support members 70 are arranged with their connecting portions 33 perpendicular to the laying direction H. Therefore, when a protective pipe 14 is laid, the pair of formwork plate connecting members 41 of each formwork support member 70 face each other, sandwiching the protective pipe 14 radially. In addition, for formwork support members 70 adjacent to each other in the laying direction H, the groove portions 47 of the formwork plate connecting members 41 adjacent to each other in the laying direction H open facing each other.

[0055] As shown in Figure 9, one longitudinal edge 23a of the formwork panel 23 is fitted into one groove 47 of the adjacent formwork panel connecting member 41 in the laying direction H, and the other longitudinal edge 23a of the formwork panel 23 is fitted into the other groove 47 of the adjacent formwork panel connecting member 41 in the laying direction H. In this way, one formwork panel 23 is supported by a pair of formwork support members 70. The formwork panel 23 is installed with its short side aligned with the vertical direction and its longitudinal direction aligned with the laying direction H. In other words, the formwork panel 23 is installed with its short side aligned with the first direction X of the formwork panel connecting member 41 and its longitudinal direction aligned with the second direction Y of the formwork panel connecting member 41. Furthermore, a pair of formwork panels 23 are installed by a pair of adjacent formwork support members 70 in the laying direction H. The formwork panels 23, installed by a pair of formwork support members 70, face each other in opposing directions perpendicular to the laying direction H. The formwork panels 23 are then installed between multiple adjacent formwork support members 70 in the laying direction H.

[0056] As a result, in the formwork forming apparatus 21, multiple formwork plates 23 are supported by formwork supports 70, so that the multiple formwork plates 23 are installed in a state that extends in the laying direction H of the protective pipe 14. Therefore, in the formwork forming apparatus 21, a formwork wall W is formed by multiple formwork plates 23 that extend in the laying direction H of the protective pipe 14. The formwork wall W is formed in pairs so that they face each other in a direction perpendicular to the laying direction H.

[0057] Next, the formwork plate connecting members 41 of adjacent formwork support members 70 in the laying direction H are connected by the connecting device 80. First, a holding member 501 for the connecting device is attached to each formwork plate connecting member 41. The holding member 501 for the connecting device is attached to the upper of the two second mounting holes 43c.

[0058] The worker positions the retaining member 501 for the connecting device on the second plate surface 41b side of the base 43 and inserts the projection 54 into the square hole of the second mounting hole 43c. Next, as shown in Figure 3, the worker inserts the screw 62, which was inserted into the round hole of the second mounting hole 43c from the first plate surface 41a side of the base 43, through the first insertion hole 55 and the second insertion hole 59, and forcibly screws it into the retaining part 56 in the second insertion hole 59. This attaches the retaining member 501 for the connecting device to the base 43.

[0059] Next, the connecting rod 81 is held by the holding member 501 for the connecting device. The worker presses the connecting rod 81 against the holding member 501 for the connecting device from the side with the projection 54. As a result, the gap between the assembly portion 51 and the holding portion 56 of the holding member 501 for the connecting device is widened against the biasing force of the biasing portion 60, and the gap between the assembly substrate 52 and the holding substrate 57 is widened. Furthermore, when the worker presses the connecting rod 81 toward the holding member 501 for the connecting device, a part of the connecting rod 81 is inserted into the holding recess 58a. Subsequently, the restoring force of the widened biasing portion 60 returns the gap between the assembly portion 51 and the holding portion 56 to its state before widening. As a result, the gap between the assembly portion 51 and the holding portion 56 narrows, and the connecting rod 81 is held inside the holding recess 58a. At this time, the positioning edge 52a of the retaining recess 58a contacts the connecting rod 81 from the opening side, and the assembly substrate 52 is pressed against the connecting rod 81.

[0060] As a result, as shown in Figure 10, the connecting rod 81 is held by the connecting device holding member 501, and the connecting rod 81 is attached to the upper part of the formwork plate connecting member 41 by the connecting device holding member 501. Note that the operation of widening the gap between the assembly part 51 and the holding part 56 of the connecting device holding member 501 may be performed manually by an operator, rather than by pressing the connecting rod 81 against the connecting device holding member 501. Alternatively, the connecting device holding member 501 may be attached to the lower second mounting hole 43c, and the connecting rod 81 may be attached to the lower part of the formwork plate connecting member 41.

[0061] As a result, the formwork plate connecting members 41 of adjacent formwork support members 70 in the laying direction H are connected by the connecting device 80. The ends of adjacent connecting rods 81 in the laying direction H are overlapped, and both ends are joined using binding wire B. As a result, adjacent formwork plate connecting members 41 of formwork support 70 in the laying direction H are connected in the laying direction H by the connecting rods 81. Therefore, the holding member 501 for the connecting device can hold the connecting rods 81 in a state where they are aligned with the second plate surface 41b, which is the thickness surface of the formwork plate 23. The state where the connecting rods 81 are aligned with the second plate surface 41b of the formwork plate 23 means that the direction in which the axis of the connecting rods 81 extends is parallel to the second plate surface 41b. In this case, the connecting rods 81 are separated from the second plate surface 41b by being held by the holding member 501 for the connecting device, but depending on the type of holding member 501 for the connecting device, the connecting rods 81 may be in contact with the second plate surface 41b.

[0062] Next, as shown in Figure 11, the worker inserts the support reinforcement 91 into one of the multiple erection sections 43a located above the lower holding member 50. The support reinforcement 91 is inserted into opposing erection sections 43a. Both ends of the support reinforcement 91 are then supported by the formwork plate connecting members 41 via the erection sections 43a. In other words, the support reinforcement 91 is supported by a pair of formwork plate connecting members 41 that form the formwork support 70.

[0063] At this time, the straight section 32 and the support reinforcement 91 are arranged side by side in the second direction Y of the erection section 43a through which the support reinforcement 91 is inserted. The dimension of the erection section 43a in the second direction Y is slightly larger than the sum of the diameter of the straight section 32 and the diameter of the support reinforcement 91. Therefore, even if the straight section 32 overlaps the erection section 43a, the support reinforcement 91 can be inserted through the erection section 43a. Furthermore, since the straight section 32 and the support reinforcement 91 can be arranged adjacent to each other in the laying direction H, the straight section 32 and the support reinforcement 91 can be fastened together with a binding wire (not shown). This fastening suppresses the axial movement of the support reinforcement 91.

[0064] As described above, the formwork forming apparatus 21 is formed by a plurality of formwork supports 70, a connecting device 80, and supporting reinforcing bars 91 provided on each formwork support 70. When a pair of formwork walls W are formed by the formwork forming device 21, a formwork 20 consisting of the pair of formwork walls W is formed.

[0065] Next, as shown in Figure 12, the worker lays the protective pipe 14 between the pair of formwork walls W. The protective pipe 14 is laid above the support bars 91 that are installed on the formwork plate connecting members 41 of each formwork support 70. The protective pipe 14 is then supported from below by the support bars 91 that are installed at equal intervals in the laying direction H. This forms the formwork installation structure. Thus, the formwork installation structure is installed on a pair of formwork plate connecting members 41 that are facing each other in opposing directions, and has support bars 91 that are below the protective pipe 14 laid above the connecting portion 33 and that cross in the opposing direction.

[0066] The formwork installation structure includes formwork plates 23 arranged to face each other radially across the protective pipe 14, and a plurality of formwork forming aids 30. The formwork installation structure also includes a plurality of formwork support members 70, formed by assembling a pair of formwork plate connecting members 41 and a single spacing determination member 31, which are spaced apart in the laying direction H of the protective pipe 14, and the protective pipe 14 is positioned above the connecting portion 33 of the spacing determination member 31. In the formwork installation structure, the edge portions 23a of the formwork plates 23 are fitted into grooves 47 of the formwork plate connecting members 41 that are adjacent to each other in the laying direction H and open to one another. The formwork plates 23 are arranged in opposing directions perpendicular to the laying direction H, sandwiching the protective pipe 14, and a radially opposing formwork wall W is formed by the plurality of formwork plates 23 extending in the laying direction H.

[0067] Next, the worker inserts the pipe float prevention reinforcing bar 92 into one of the multiple erection sections 43a located above the protective pipe 14 in each formwork support 70, which is located directly above the protective pipe 14. Thus, the erection section 43a is located above the protective pipe 14 and is positioned so that the pipe float prevention reinforcing bar 92 can be attached at multiple locations.

[0068] The pipe float prevention reinforcement bars 92 are inserted through opposing erection sections 43a. Both ends of the pipe float prevention reinforcement bars 92 are supported by the formwork plate connecting members 41 via the erection sections 43a and are attached to the formwork plate connecting members 41. Therefore, the formwork installation structure is erected on a pair of opposing formwork plate connecting members 41 and has pipe float prevention reinforcement bars 92 that are above the protective pipe 14 laid above the connecting section 33 and that cross in the opposing direction.

[0069] The pipe float prevention reinforcement bars 92 are supported by a pair of formwork plate connecting members 41 that form the formwork support 70. At this time, the straight section 32 and the pipe float prevention reinforcement bars 92 are arranged side by side in the second direction Y of the erected section 43a through which the pipe float prevention reinforcement bars 92 are inserted. The dimension of the erected section 43a in the second direction Y is slightly larger than the sum of the diameter of the straight section 32 and the diameter of the pipe float prevention reinforcement bars 92. Therefore, even if the straight section 32 overlaps the erected section 43a, the pipe float prevention reinforcement bars 92 can be inserted through the erected section 43a. Furthermore, since the straight section 32 and the pipe float prevention reinforcement bars 92 can be arranged adjacent to each other in the laying direction H, the straight section 32 and the pipe float prevention reinforcement bars 92 can be fastened together with a binding wire (not shown). This fastening suppresses the axial movement of the pipe float prevention reinforcement bars 92.

[0070] Furthermore, the protective pipe 14 is prevented from floating upward by multiple pipe float prevention reinforcing bars 92 installed at equal intervals in the laying direction H. The erection section 43a through which the pipe float prevention reinforcing bars 92 are inserted is appropriately changed according to the diameter of the protective pipe 14. In other words, the erection section 43a is provided in the formwork plate connecting member 41 above the protective pipe 14 and at a position that allows for the attachment of pipe float prevention reinforcing bars 92 at multiple locations.

[0071] Therefore, the formwork installation structure is erected on a pair of formwork plate connecting members 41 facing each other in opposing directions, and has reinforcing bars 92 to prevent pipe floating that cross the protective pipe 14 laid above the connecting portion 33 in opposing directions. With this, the formwork installation structure is completed.

[0072] <Manufacturing of protective concrete> With the formwork installation structure in place, the worker pours concrete between the pair of formwork walls W, i.e., into the formwork 20. During concrete pouring, multiple pipe float prevention reinforcing bars 92 prevent the protective pipe 14 from floating due to the concrete pouring pressure. The spacing determination member 31, support reinforcing bars 91, pipe float prevention reinforcing bars 92, and four holding members 50 are embedded in the concrete. The protective pipe 14, sandwiched between the support reinforcing bars 91 and the pipe float prevention reinforcing bars 92, is also embedded in the concrete. When the concrete hardens, protective concrete 13 is formed, and the protective pipe 14 is embedded in the protective concrete 13.

[0073] [Effects of the Embodiment] According to the above embodiment, the following effects can be obtained. (1) The formwork forming aid 30 includes a spacing determination member 31 and a formwork plate connecting member 41. When each straight section 32 of the spacing determination member 31 is attached to the formwork plate connecting member 41 by the mounting section 49, the spacing determination member 31 can determine the spacing between a pair of opposing formwork plate connecting members 41. Then, when the formwork plates 23 are fitted into the grooves 47 of each formwork plate connecting member 41 and the formwork plates 23 are assembled to the formwork plate connecting member 41, the spacing of the formwork plates 23 in the opposing direction can be determined by the formwork forming aid 30. For example, compared to installing the formwork 20 while measuring the spacing of the formwork plates 23 in the opposing direction, the formwork forming aid 30 makes it easier to install the formwork 20 using formwork plates 23.

[0074] (2) The formwork board connecting member 41 has grooves 47 on both sides of the base 43 in the second direction Y. Therefore, the formwork board connecting member 41 can hold the formwork boards 23 on both sides in the second direction Y. Thus, compared to the case where the formwork board connecting member 41 holds the formwork boards 23 on only one side in the second direction Y, for example, the installation efficiency of the formwork boards 23 using the formwork forming aid 30 is improved.

[0075] (3) The formwork plate connecting member 41 is provided with a first mounting hole 43b. The holding member 50 can be attached to the base 43 using the first mounting hole 43b. The spacing determination member 31 can then be attached to the formwork plate connecting member 41 by having the holding member 50 hold the straight section 32. In other words, the spacing determination member 31 can be easily attached to the formwork plate connecting member 41 by the holding member 50, which is the mounting section 49, and the first mounting hole 43b.

[0076] (4) The formwork plate connecting member 41 is provided with two first mounting holes 43b side by side in the first direction X. Therefore, two holding members 50 can be attached to the formwork plate connecting member 41. Thus, the straight section 32 can be attached to the formwork plate connecting member 41 in a stable state by the two holding members 50, and the axis of the straight section 32 can be attached to the formwork plate connecting member 41 in a state that extends in the first direction X.

[0077] (5) The spacing determination member 31 is formed by bending a reinforcing bar into a U-shape. By using the spacing determination member 31, the pair of formwork plate connecting members 41 can be spaced apart to the length of the connecting portion 33. Therefore, the spacing between the pair of formwork plate connecting members 41 can be easily determined simply by using the spacing determination member 31, which can be easily formed from a reinforcing bar.

[0078] (6) The formwork forming apparatus 21 is formed by arranging a plurality of formwork support members 70 spaced apart in the laying direction H, and fitting formwork plates 23 into grooves 47 of adjacent formwork plate connecting members 41 in the laying direction H. As a result, the formwork plates 23 are arranged with the protective pipe 14 in between in opposing directions, and the formwork wall W is formed by these formwork plates 23. Therefore, the formwork wall W and, consequently, the formwork 20 can be easily installed using a plurality of formwork support members 70 and a plurality of formwork plates 23.

[0079] (7) In the formwork forming apparatus 21, adjacent formwork plate connecting members 41 in the laying direction H are connected in the laying direction H by a connecting device 80. Therefore, the relative displacement of the formwork plate connecting members 41 of each formwork support 70 in the laying direction H is suppressed by the connecting device 80. As a result, the longitudinal displacement of the formwork plate 23 is suppressed, and the deformation of the formwork wall W is suppressed.

[0080] (8) The connecting device 80 includes a linearly extending connecting rod 81 and a holding member 501 for the connecting device. When the holding member 501 for the connecting device is attached to the second plate surface 41b of the formwork plate connecting member 41, the connecting rod 81 can be assembled to the base 43 by the holding member 501 for the connecting device, which holds the connecting rod 81. As a result, the connecting rod 81 can be easily assembled to the base 43.

[0081] (9) Since the holding member 501 for the connecting device is attached to the second plate surface 41b of the formwork plate connecting member 41, the connecting rod 81 can be placed on the outer surface side of the formwork plate 23. This eliminates the reduction in the amount of concrete poured into the formwork 20 due to the connecting device 80.

[0082] (10) Each formwork plate connecting member 41 of the formwork support 70 is provided with multiple erection sections 43a. The pipe float prevention reinforcing bars 92 can be inserted through the erection sections 43a located above the protective pipe 14, thereby erecting the pipe float prevention reinforcing bars 92 on the formwork plate connecting member 41. These pipe float prevention reinforcing bars 92 prevent the protective pipe 14 from floating due to the pressure of concrete placement. As a result, the protective pipe 14 can be embedded in the protective concrete 13 while ensuring a concrete layer of a predetermined thickness above the protective pipe 14.

[0083] (11) In addition, each formwork plate connecting member 41 of the formwork support 70 is provided with multiple erection sections 43a. Support reinforcement bars 91 can be inserted through the erection sections 43a located below the protective pipe 14, thereby erecting the support reinforcement bars 91 on the formwork plate connecting member 41. By supporting the protective pipe 14 with the support reinforcement bars 91, protective concrete 13 can be formed below the protective pipe 14, so that the entire circumference of the protective pipe 14 can be embedded in the protective concrete 13.

[0084] (12) In the formwork installation structure, adjacent formwork board connecting members 41 in the laying direction H are connected in the laying direction H by connecting rods 81. In addition, the ends of adjacent connecting rods 81 in the laying direction H are joined by binding wires B. This allows multiple formwork board connecting members 41 to be connected by connecting rods 81.

[0085] (13) The formwork board connecting member 41 is provided with a first mounting hole 43b and a second mounting hole 43c. When the holding member 50 is attached to the base 43 using the first mounting hole 43b, the spacing determining member 31 can be attached to the formwork board connecting member 41 so that the straight section 32 extends in the vertical direction. On the other hand, when the holding member 501 for the connecting device is attached to the base 43 using the second mounting hole 43c, the connecting rod 81 can be attached to the formwork board connecting member 41 so that it extends in the laying direction H. In other words, by using the first mounting hole 43b and the second mounting hole 43c, the direction in which the rod-shaped members extend can be different when attached to the base 43.

[0086] (14) The formwork plate connecting member 41 is formed by shaping a single metal plate 42. For example, unlike the case in which a second groove forming portion 45, which is separate from the base portion 43, is joined to the base portion 43 by welding or fastening to form a groove portion 47 together with the first groove forming portion 44, the formwork plate connecting member 41 having a groove portion 47 can be easily manufactured. In addition, the strength of the second groove forming portion 45 can be increased, so deformation of the second groove forming portion 45 can be suppressed when the formwork plate 23 is fitted into the groove portion 47.

[0087] (15) The erection section 43a is elongated, with its longitudinal side extending in the laying direction H. Therefore, even if the positions of the formwork plate connecting members 41 are relatively shifted in opposing directions in the formwork support 70, the erection members 90 can be inserted through both erection sections 43a by utilizing the elongated holes in the erection section 43a. In addition, the support bars 91 or pipe float prevention bars 92 inserted through the erection section 43a and the straight section 32 can be positioned adjacent to each other in the second direction Y of the erection section 43a. The support bars 91 and the straight section 32 can be fastened together with binding wire, and the pipe float prevention bars 92 and the straight section 32 can also be fastened together with binding wire. This prevents the support bars 91 and pipe float prevention bars 92 from moving in the axial direction.

[0088] (16) Each formwork plate connecting member 41 of the formwork support 70 is provided with multiple erection sections 43a. Depending on the outer diameter of the protective pipe 14 supported by the support reinforcing bars 91, the erection sections 43a through which the support reinforcing bars 91 and the pipe float prevention reinforcing bars 92 are inserted can be selected. Furthermore, the erection sections 43a are provided above the protective pipe 14 and at positions that allow the pipe float prevention reinforcing bars 92 to be attached at multiple locations. Therefore, the insertion position of the pipe float prevention reinforcing bars 92 can be adjusted according to the outer diameter of the protective pipe 14, thereby effectively preventing the pipe float prevention reinforcing bars 92 from floating. In addition, the height of the protective pipe 14 in the protective concrete 13 can also be adjusted.

[0089] [Example of changes] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0090] ○The length of the connecting rod 81 can be changed as appropriate. In this case, the number of points where the ends of the connecting rod 81 are joined together with binding wire B will be zero or increased or decreased. ○The formwork forming device 21 does not necessarily have to have a connecting device 80. In this case, the base portion 43 does not necessarily have to have a second mounting hole 43c.

[0091] ○In the formwork installation structure and formwork forming device 21, the pipe floating prevention reinforcement bars 92 are not required. ○In the formwork installation structure and formwork forming device 21, the supporting reinforcement bars 91 are not required. ○The erection section 43a may be provided as a single unit on the base 43 in order to erect only the support reinforcement 91 onto the formwork support 70. Alternatively, the erection section 43a may be provided as a single unit on the base 43 in order to erect only the pipe float prevention reinforcement 92 onto the formwork support 70.

[0092] ○The spacing determination member 31 may be in the shape of a rectangular frame having a pair of straight sections 32, one connecting section 33 that connects one end of the pair of straight sections 32, and the other connecting section 33 that connects the other ends of the pair of straight sections 32.

[0093] ○The length of the connecting portion 33 of the spacing determination member 31 can be changed as appropriate. By preparing multiple types of spacing determination members 31 with different lengths of connecting portion 33, the spacing between a pair of formwork plate connecting members 41 can be set to multiple types.

[0094] ○In the formwork plate connecting member 41, the groove portion 47 may be formed together with the first groove portion 44 by joining a second groove-forming portion 45, which is a separate member from the base portion 43, to the base portion 43. ○The holding member 501 for the connecting device may be attached to the first plate surface 41a of the formwork plate connecting member 41, thereby holding the connecting rod 81 in a state where it is aligned with the first plate surface 41a of the formwork plate connecting member 41.

[0095] The holding member 50 and the holding member 501 for the connecting device may be pre-joined to the base 43 and integrated with the formwork plate connecting member 41. ○Only one retaining member 50 may be attached to the formwork plate connecting member 41, and the straight section 32 may be attached to the base 43 by this single retaining member 50. In this case, the first mounting hole 43b for attaching the retaining member 50 is changed depending on the position in which the straight section 32 is held. Therefore, multiple first mounting holes 43b are formed in the base 43 so that the retaining member 50 can be attached in different positions.

[0096] ○At least one of the spacing determining member 31, connecting rod 81, support reinforcing bar 91, and pipe floating prevention reinforcing bar 92 may be a metal round bar or square bar other than 3 / 8 inch or 4 / 8 inch reinforcing bar. ○The spacing determination member 31 may be formed in a U-shape by welding straight metal rods together. [Explanation of Symbols]

[0097] W...formwork wall, 13...protective concrete, 14...protective pipe as pipe material, 20...formwork, 21...formwork forming device, 23...formwork plate, 23a...edge part, 30...formwork forming auxiliary tool, 31...spacing determination member, 32...straight part, 33...connecting part, 41...formwork plate connecting member, 41a...first plate surface, 41b...second plate surface, 43...base part, 43a...erecting part, 43b...first mounting hole constituting the mounting part, 47...groove part, 49...mounting part, 50...holding member constituting the mounting part, 51...assembly part, 56...holding part, 43b...first mounting hole, 70...formwork support, 80...connecting device, 81...connecting rod material, 90...erecting member, 91...supporting reinforcing bar, 92...reinforcing bar to prevent pipe floating, 501...holding member for connecting device.

Claims

1. A formwork forming aid used to assist in the installation of formwork for protective concrete that protects buried pipes, Used to install formwork plates that are arranged to face each other radially across the pipe material in order to form the aforementioned formwork, A U-shaped spacing determination member having a pair of opposing straight sections spaced wider than the outer diameter of the pipe material, and a connecting portion connecting the ends of the pair of straight sections, A formwork plate connecting member having a plate-shaped base, a pair of grooves that open in opposite directions on either side of the base and extend parallel to each other so as to be able to fit the edge portion of the formwork plate, and a mounting portion for attaching the straight portion to the base, A formwork forming aid that allows the spacing between a pair of formwork plate connecting members to be determined by the spacing determination member, by attaching each of the pair of straight sections to the base using the mounting section.

2. The spacing determining member is formed by bending a rod-shaped body into the U-shape, The aforementioned mounting portion is It is a separate member from the formwork plate connecting member, and comprises a holding member that holds the straight section, It consists of a mounting hole provided in the base for attaching the retaining member, The formwork forming aid according to claim 1, wherein the mounting holes are formed in multiple locations so that the retaining member can be mounted in a different position, or so that multiple retaining members can be mounted.

3. A formwork forming device used to form the formwork for protective concrete that protects buried pipes, Formwork plates that form the aforementioned formwork and are arranged to face the pipe material radially, It includes a formwork forming aid used to assist in the installation of the aforementioned formwork, The aforementioned formwork forming aid is A U-shaped spacing determination member having a pair of opposing straight sections spaced wider than the outer diameter of the pipe material, and a connecting portion connecting the ends of the pair of straight sections, A formwork plate connecting member having a plate-shaped base, a pair of grooves that open in opposite directions on either side of the base and extend parallel to each other so as to be able to fit the edge portion of the formwork plate, and a mounting portion for attaching the straight portion to the base, Multiple formwork support members, formed by assembling a pair of the formwork plate connecting members and the spacing determining members, are arranged spaced apart in the direction in which the pipe material is laid. The edge portion of the formwork plate is fitted into the groove portion which is adjacent to and faces each other in the laying direction, The formwork plates are arranged in opposing directions perpendicular to the laying direction, with the pipe material in between them. A formwork forming apparatus characterized in that a plurality of formwork plates extending in the laying direction formwork walls facing each other in the opposing direction are formed by these plates.

4. The formwork forming apparatus according to claim 3, wherein the formwork plate connecting members of the formwork support members adjacent to each other in the laying direction are connected in the laying direction by a connecting device.

5. The aforementioned connection device, A rod-shaped connecting rod extending linearly in the laying direction, The device comprises a holding portion for holding the connecting rod, and a holding member for a connecting device which is integrated with the holding portion and has an assembly portion that is assembled to the base, The formwork forming apparatus according to claim 4, wherein the holding member for the connecting device is capable of holding the connecting rod material in a state where it is aligned with the surface of the formwork plate.

6. The base portion has a mounting section to which a mounting member is attached, which is erected on a pair of formwork plate connecting members facing each other in the opposing direction and embedded in the protective concrete. The formwork forming apparatus according to any one of claims 3 to 5, wherein the erection section is provided at a position above the pipe material that allows the erection member to be attached.

7. The base portion has a mounting section to which a mounting member is attached, which is erected on a pair of formwork plate connecting members facing each other in the opposing direction and embedded in the protective concrete. The formwork forming apparatus according to any one of claims 3 to 5, wherein the erection section is provided above the pipe material and at a position that allows the erection member to be attached at multiple locations.

8. A formwork installation structure for installing formwork to form protective concrete that protects buried pipes, Formwork plates that form the aforementioned formwork and are arranged to face the pipe material radially, It includes a formwork forming aid used to assist in the installation of the aforementioned formwork, The aforementioned formwork forming aid is A U-shaped spacing determination member having a pair of opposing straight sections spaced wider than the outer diameter of the pipe material, and a connecting portion connecting the ends of the pair of straight sections, A formwork plate connecting member having a plate-shaped base, a pair of grooves that open in opposite directions on either side of the base and extend parallel to each other so as to be able to fit the edge portion of the formwork plate, and a mounting portion for attaching the straight portion to the base, Multiple formwork support members, formed by assembling a pair of the formwork plate connecting members and the spacing determining members, are arranged spaced apart in the direction in which the pipe material is laid. The pipe material is positioned above the multiple connecting parts, The edge portions of the formwork plates are fitted into the grooves that are adjacent to each other in the laying direction and open to each other, and the formwork plates are arranged in opposing directions perpendicular to the laying direction, sandwiching the pipe material between them. A formwork installation structure characterized in that a pair of formwork walls extending in the laying direction are formed by a plurality of formwork plates extending in the laying direction.

9. The formwork installation structure according to claim 8, comprising a frame member that is erected on a pair of formwork plate connecting members facing each other in the opposing directions, and that is located above the pipe material laid above the connecting portion and crosses in the opposing directions.

10. The formwork installation structure according to claim 9, wherein two formwork board connecting members sandwiching one formwork board are connected in the laying direction of the pipe material by a linearly extending rod-shaped connecting rod, and the end of the connecting rod is connected to the end of another connecting rod adjacent to the laying direction of the pipe material.

Images