Formwork for manufacturing precast concrete beams with joints and method for manufacturing precast concrete beams with joints

Abstract

This invention provides a formwork technology for seamlessly partitioning concrete pouring spaces at concrete pouring locations when manufacturing precast concrete beams with joints. [Solution] The formwork for manufacturing precast concrete beams with joints comprises a formwork for the beam section with a concrete pouring space for the beam section formed on the inside, a formwork for the joint section with a concrete pouring space for the joint section formed on the inside, a vertically insertable partition member that is inserted and removed vertically from the concrete pouring division point in the concrete pouring space for the beam section, and a horizontally insertable partition member that is inserted and removed horizontally from the concrete pouring division point. The vertical partition member extends vertically and has a vertical insertion groove that is open at the lower end and through which axial reinforcement can be inserted, and the horizontally insertable partition member extends horizontally and has a horizontal insertion groove that is open at one end and through which axial reinforcement can be inserted.

Description

Technical Field

[0001] The present invention relates to a formwork for manufacturing a precast concrete beam with a joint and a method for manufacturing a precast concrete beam with a joint.

Background Art

[0002] In order to shorten the construction period and ensure the quality of the frameworks of buildings and civil engineering structures, it is generally common to adopt precast concrete members. Precast concrete members are often manufactured in advance at factories or the like, and the quality can be kept stable without being affected by the weather with respect to manufacturing. In addition, precast concrete members can reduce the reinforcement work at the construction site, the reinforcement inspection accompanying the reinforcement work, and the work of placing and curing concrete.

[0003] In recent years, a construction method has been put into practical use in which the column-beam joint (joint part), which was conventionally cast with concrete at the construction site, is made into a precast member integrated with the beam, thereby shortening the construction period. In the manufacture of such a precast concrete beam with a joint, when the concrete strengths required for the column-beam joint (joint part) and the beam part are different, the concrete with different strengths is separately placed. Conventionally, the concrete was separately placed by arranging a metallic lath net, a form board, an air formwork, etc. in the part where the concrete is separated to partition the space inside the formwork.

[0004] In this regard, a partition member has been proposed as a formwork for manufacturing a precast concrete member having a reinforced concrete column-beam joint and a beam section, which is inserted into and removed from the concrete pouring space for the beam section at the pouring division point to divide the concrete pouring space for the beam section (see Patent Document 1). The partition member described in Patent Document 1 comprises a partition plate with beam main reinforcement insertion grooves extending vertically through which beam main reinforcement can be inserted, and a plurality of flexible sheet materials. Each sheet material is configured to bend upon contact with the main beam reinforcement at the main beam reinforcement insertion groove where the main beam reinforcement is inserted, thereby blocking the main beam reinforcement insertion grooves other than those through which the main beam reinforcement is inserted within the concrete pouring space for the beam section, and allowing the main beam reinforcement to be inserted into the main beam reinforcement insertion groove. Furthermore, each sheet material is attached to the partition plate such that when the partition member is pulled upward from the concrete pouring space for the beam section, it deforms or moves upon contact with the main beam reinforcement as the main beam reinforcement moves relatively toward the open end within the main beam reinforcement insertion groove, thereby allowing the relative movement of the main beam reinforcement. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2010-94914 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] While it is true that the formwork described in Patent Document 1 may improve labor and work efficiency when pouring concrete in sections compared to using the aforementioned wire mesh, loose boards, air formwork, etc., there was room for improvement in terms of completely separating the concrete pouring space at the concrete pouring section.

[0007] The technology disclosed herein was developed in view of the above-mentioned problems, and its purpose is to provide a formwork technology for partitioning concrete pouring spaces without gaps at concrete pouring locations when manufacturing precast concrete beams with joints. [Means for solving the problem]

[0008] The technology relating to this disclosure is a formwork for manufacturing a reinforced concrete precast concrete beam with a joint, which integrates a joint portion and a beam portion extending from said joint portion. A formwork for a beam section, which extends in a straight line and has an open top, with a concrete pouring space for the beam section formed on its interior, and a formwork for a joint section, which is connected to the end of the formwork for the beam section and has an open top, with a concrete pouring space for the joint section formed on its interior so as to communicate with the concrete pouring space for the beam section, A vertically insertable partition member is inserted vertically into and removed from the concrete pouring location located near the boundary between the concrete pouring space for the beam section and the concrete pouring space for the joint section, A lateral insertion / removal type partition member that is inserted laterally into and removed from the aforementioned concrete pouring division point, Equipped with, The aforementioned vertical partition member extends vertically, has an open lower end, and has a vertical insertion groove through which the axial reinforcement of the beam can be inserted. The aforementioned lateral insertion-type partition member extends to the left and right, has an open end at one end, and has a lateral insertion groove through which the axial reinforcement of the beam can be inserted.

[0009] Here, the lateral insertion / removal type partition member is composed of a first partition member that is inserted laterally into and removed from the concrete pouring division location through a first slit formed in the first side formwork of the beam formwork, and a second partition member that is inserted laterally into and removed from the concrete pouring division location through a second slit formed in the second side formwork which is positioned opposite the first side formwork of the beam formwork. The first partition member and the second partition member are configured to partition the concrete pouring area by bringing their inner edges together when inserted from the first slit and the second slit, and the open end of the horizontal insertion groove may be located on the inner edge.

[0010] Furthermore, the inner edges of the first partition member and the second partition member may be configured to abut each other at the center in the width direction of the concrete pouring location.

[0011] Furthermore, the other end of the horizontal insertion groove may be formed as a closed end, and the inner edges of the first partition member and the second partition member may be abutted together when the axial reinforcing bar inserted through the horizontal insertion groove is located near the closed end.

[0012] Furthermore, the first partition member includes a plurality of first dividing partition plates that are divided in the height direction of the concrete pouring division location and can be inserted into and removed from the concrete pouring division location through the first slit, and the horizontal insertion groove is formed in at least one of the plurality of first dividing partition plates. The second partition member includes a plurality of second dividing partition plates that are divided in the height direction of the concrete pouring division area and can be inserted into and removed from the concrete pouring division area through the second slit, and the horizontal insertion groove is formed in at least one of the plurality of second dividing partition plates. The concrete pouring area may be partitioned by abutting the inner edges of the first and second partition plates together, with the multiple first partition plates inserted into the concrete pouring area through the first slit arranged vertically, and the multiple second partition plates inserted into the concrete pouring area through the second slit arranged vertically.

[0013] The technology disclosed herein integrates a joint and a beam extending from the joint into a single reinforced concrete structure. It can be specified as a manufacturing method for manufacturing a precast concrete beam with a joint using the above-described formwork. That is, the manufacturing method of the precast concrete beam with a joint according to the present disclosure is reinforcing bars are arranged in the concrete placing space for the beam portion and the concrete placing space for the joint portion, and the vertical insertion / removal partition member and the horizontal insertion / removal partition member are arranged at the concrete separation location, beam concrete is placed in the concrete placing space for the beam portion, and joint concrete is placed in the concrete placing space for the joint portion respectively, after the concrete is placed, the vertical insertion / removal partition member and the horizontal insertion / removal partition member may be pulled out from the concrete separation location.

Advantages of the Invention

[0014] According to the present invention, when manufacturing a precast concrete beam with a joint, a technique regarding a formwork for partitioning the concrete placing space without gaps at the concrete separation location can be provided.

Brief Description of the Drawings

[0015] [Figure 1] FIG. 1 is a perspective view showing an example of a precast concrete beam with a joint manufactured using the formwork according to the embodiment. [Figure 2] FIG. 2 is a view showing a formwork for manufacturing a precast concrete beam with a joint. [Figure 3] FIG. 3 is a front view of the vertical insertion / removal partition member. [Figure 4] FIG. 4 is a view for explaining a state where the vertical insertion / removal partition member is installed at the concrete separation location. [Figure 5] FIG. 5 is a front view of the horizontal insertion / removal partition member. [Figure 6] FIG. 6 is a view for explaining a situation where the horizontal insertion / removal partition member is installed at the concrete separation location. <0oo0090> [Figure 7] ]'FIG. 7 is a view for explaining a state where a horizontally inserted and removed partition member is installed at a concrete placement section.

Embodiment for Implementing the Invention

[0016] Hereinafter, a mold for manufacturing a precast concrete member according to an embodiment will be described with reference to the drawings.

[0017] <Embodiment> FIG. 1 is a perspective view showing an example of a precast concrete beam 10 with a joint manufactured using the mold according to the embodiment. The precast concrete beam 10 with a joint is a precast reinforced concrete member in which a joint portion (column-beam joint portion) 11 and a beam portion 12 extending from the joint portion 11 are integrated, and the joint portion 11 is provided at an intermediate portion in the longitudinal direction of the beam portion 12. In other words, the precast concrete beam 10 with a joint extends such that the beam portions 12 are located in a straight line from a pair of opposing surfaces of the joint portion 11. The joint portion 11 of the precast concrete beam 10 with a joint has, for example, a higher concrete strength than the beam portion 12.

[0018] The beam portion 12 includes a lower beam reinforcement (main beam reinforcement) T1, an upper beam reinforcement (main beam reinforcement) T2, a stirrup reinforcement T3, a web reinforcement T4 (see FIG. 4, etc.). The main beam reinforcements T1, T2 and the web reinforcement T4 are axial reinforcements extending in the axial direction in which the beam portion 12 extends. Further, the joint portion 11 has, for example, a column main reinforcement insertion hole (not shown) through which the column main reinforcement of a column member (for example, a precast concrete column) joined to the precast concrete beam 10 with a joint can be inserted, formed to penetrate in the vertical direction. In addition, the joint portion 11 includes, for example, hoop reinforcements embedded in the concrete for the joint portion. and so on.

[0019] FIG. 2 is a view showing a mold 20 for manufacturing the precast concrete beam 10 with a joint. The mold 20 includes a joint portion mold 30 for forming the joint portion 11, a pair of beam portion molds 40 for forming each beam portion 12, a vertically inserted and removed partition member 50, a horizontally inserted and removed partition member 60, etc.

[0020] The formwork 30 for the joint section forms a concrete pouring space 31 for the joint section on its inside. The formwork 30 for the joint section includes a bottom formwork 32 that forms the bottom of the concrete pouring space 31 for the joint section, a pair of side formworks 33, 33 that rise upward from both sides of the bottom formwork 32 and are positioned opposite each other, and a pair of end formworks 34, 34 that connect both ends of the pair of side formworks 33, 33 and rise upward from the bottom formwork 32. For example, the upper edge heights of the pair of side formworks 33, 33 and the pair of end formworks 34, 34 are equal. The top of the formwork 30 for the joint section is open, and the concrete pouring space 31 for the joint section is formed on its inside.

[0021] In the joint formwork 30 described above, beam formwork 40 is connected to each of the end formworks 34, 34, and a pair of beam formworks 40 are extended in a straight line with the joint formwork 30 in the center. Each beam formwork 40 extends horizontally with its top open so that a concrete pouring space 41 for the beam is formed inside it.

[0022] The formwork 40 for the beam section includes a bottom formwork 42 that forms the bottom of the beam section 12, a pair of side formworks 43A and 43B that rise upward from both sides of the bottom formwork 42 and are parallel to each other, and an end formwork 44 that connects the distal ends of the pair of side formworks 43A and 43B and rises upward from the bottom formwork 42. The area enclosed by these forms the concrete pouring space 41 for the beam section. The end formwork 44 is located at the end of the beam section formwork 40 that is furthest from the joint section formwork 30 in the longitudinal direction over which the beam section formwork 40 extends. In addition, the end of the beam section formwork 40 that connects to the joint section formwork 30 is formed as an open end. As shown in Figure 2, communication openings 35 are formed in the end formwork 34, 34 of the joint formwork 30, and the concrete pouring space 41 for the beam section in each beam formwork 40 and the concrete pouring space 31 for the joint section in the joint formwork 30 are connected through these communication openings 35. Hereinafter, one side formwork 43A may be referred to as the "first side formwork," and the other side formwork 43B, which is positioned opposite the first side formwork 43A, may be referred to as the "second side formwork."

[0023] In the beam formwork 40, for example, the upper edge heights of the pair of side formwork 43A, 43B and the end formwork 44 are equal to each other. Also, the pair of side formwork 43A, 43B in each beam formwork 40 extend parallel to the pair of side formwork 43, 43 in the joint formwork 30, and the end formwork 44 in each beam formwork 40 extends parallel to the pair of end formwork 34, 34 in the joint formwork 30. Furthermore, the upper edge height of the joint formwork 30 is higher than the upper edge height of the beam formwork 40, and the distance between the pair of side formwork 33, 33 in the joint formwork 30 is greater than the distance between the pair of side formwork 43A, 43B in each beam formwork 40. In the beam formwork 40, the direction in which the pair of side formwork 43A and 43B extend is called the "longitudinal direction," the direction in which the pair of side formwork 43A and 43B are separated is called the "width direction," and the height direction of the pair of side formwork 43A and 43B is called the "vertical direction." In addition, each formwork panel constituting the joint formwork 30 and the pair of beam formwork 40 may be bolted to each other, for example, in order to facilitate assembly and disassembly.

[0024] Reference numeral 45A in Figure 2 indicates a first slit provided in the first side formwork 43A of the beam formwork 40. Reference numeral 45B indicates a second slit provided in the second side formwork 43B of the beam formwork 40. The first slit 45A and the second slit 45B are slit-shaped opening grooves. The first slit 45A extends from the lower edge (bottom end) of the first side formwork 43A upwards. The first slit 45A extends in a straight line vertically across the edge (upper end). The second slit 45B extends in a straight line vertically from the lower edge (bottom end) to the upper edge (upper end) of the second side formwork 43B. The first slit 45A and the second slit 45B are located near the end of the beam formwork 40 that connects to the joint formwork 30 in the longitudinal direction, and are positioned opposite each other. For example, the first slit 45A and the second slit 45B are located at positions equal in distance from the connection end to the joint formwork 30 in the longitudinal direction of the beam formwork 40. The first slit 45A and the second slit 45B are provided at positions corresponding to the concrete pouring division point P1, which will be described later. The concrete pouring division point P1 in the beam formwork 40 may be set at a location approximately 10 cm away from the connection end that connects to the joint formwork 30. However, the position of the concrete pouring division point P1 is not particularly limited.

[0025] Next, the vertically insertable partition member 50 and the horizontally insertable partition member 60 will be described. In a precast concrete beam 10 with a joint manufactured by the formwork 20, for example, the required concrete strength may differ between the joint portion 11 and the beam portion 12. In such cases, it is necessary to pour concrete of different strengths for the joint portion 11 and the beam portion 12. Generally, the joint portion 11 requires a higher concrete strength than the beam portion 12. For example, in order to reduce costs while ensuring the strength of the structure, concrete of lower strength than that used in the joint portion 11 is used in the beam portion 12. Therefore, the formwork 20 (formwork 40 for the beam portion) according to this embodiment has a structure that allows for the pouring of concrete (for example, concrete of different strengths) at a concrete pouring location P1 located near the boundary between the concrete pouring space 41 for the beam portion and the concrete pouring space 31 for the joint portion.

[0026] Specifically, the formwork 20 is equipped with a vertically insertable partition member 50 and a horizontally insertable partition member 60 that are inserted into and removed from the concrete pouring division point P1, and is structured to partition the concrete pouring division point P1 using these members. In other words, the vertically insertable partition member 50 and the horizontally insertable partition member 60 are partition members that are inserted into and removed from the concrete pouring division point P1 in the concrete pouring space 41 for the beam section, and are configured to work together to partition the concrete pouring division point P1.

[0027] The vertically insertable partition member 50 is designed to be inserted and removed vertically from the concrete pouring division point P1 (concrete pouring space 41 for the beam section). On the other hand, the horizontally insertable partition member 60 is inserted and removed horizontally (left and right) from the concrete pouring division point P1 (concrete pouring space 41 for the beam section). The vertically insertable partition member 50 and the horizontally insertable partition member 60 are made of a material that does not deform under the lateral pressure during concrete pouring, such as steel plate. However, the material of the vertically insertable partition member 50 and the horizontally insertable partition member 60 is not particularly limited as long as the material does not deform under the lateral pressure of the concrete acting during concrete pouring. The vertically insertable partition member 50 and the horizontally insertable partition member 60 are installed, for example, after the reinforcement bar placement within the beam section formwork 40 has been completed.

[0028] First, the vertically insertable partition member 50 will be described. Figure 3 is a front view of the vertically insertable partition member 50. The vertically insertable partition member 50 is formed of a steel plate that has a rectangular shape overall, and has a width that allows it to be inserted from above into the concrete pouring division point P1 in the concrete pouring space 41 for the beam section. As shown in Figure 2, the vertically insertable partition member 50 can be inserted from above into the concrete pouring division point P1 to partition the concrete pouring space 41 for the beam section in a direction perpendicular to the longitudinal direction of the beam section concrete pouring space 41. At that time, the vertically insertable partition member 50 is installed in the concrete pouring division point P1 with its front surface extending parallel to the width direction (lateral direction) of the concrete pouring space 41 for the beam section.

[0029] Here, the width of the vertically insertable partition member 50 is slightly smaller than the width of the concrete pouring space 41 for the beam, so that it can be inserted and removed vertically from the concrete pouring division point P1 in the concrete pouring space 41 for the beam. Also, the height dimension of the vertically insertable partition member 50 in the vertical direction is formed to be greater than the height of the beam 12 manufactured by the formwork 20. As will be described later, in this embodiment, the horizontally insertable partition member 60 is inserted into the concrete pouring division point P1 from the side through the first slit 45A and the second slit 45B formed in the formwork 40 for the beam. In contrast, the vertically insertable partition member 50 is installed in the longitudinal direction of the concrete pouring space 41 for the beam, adjacent to the first slit 45A and the second slit 45B. As a result, when the vertically insertable partition member 50 and the horizontally insertable partition member 60 are installed at the concrete pouring division point P1, they are positioned adjacent to each other in the longitudinal direction of the concrete pouring space 41 for the beam section.

[0030] Reference numeral 51 denotes the upper edge of the vertical insertion-type partition member 50, reference numeral 52 denotes the lower edge of the vertical insertion-type partition member 50, and 53A and 53B denotes a pair of side edges of the vertical insertion-type partition member 50. The vertical insertion-type partition member 50 extends vertically and has a vertical insertion groove 55 that is open at the lower end and through which the axial reinforcement of the beam portion 12 can be inserted. The vertical insertion-type partition member 50 has a so-called comb-shaped partition plate form, and a plurality of vertical insertion grooves 55 are provided at intervals in the width direction of the vertical insertion-type partition member 50. In the example shown in Figure 3, four vertical insertion grooves 55 are provided in the width direction of the vertical insertion-type partition member 50 and extend vertically from the vertical insertion-type partition member 50.

[0031] The lower end of each vertical insertion groove 55 in the extending direction (longitudinal direction) is positioned at the lower edge 52 of the vertical insertion / removal type partition member 50, thereby forming an open end 551. On the other hand, the upper end of each vertical insertion groove 55 in the extending direction (longitudinal direction) is formed as a closed end 552.

[0032] Figure 4 illustrates the installation of a vertically insertable partition member 50 at a concrete pouring division point P1 in a concrete pouring space 41 for a beam section. When installing the vertically insertable partition member 50 at the concrete pouring division point P1, the vertically insertable partition member 50 is inserted into the concrete pouring space 41 for the beam section from above the concrete pouring division point P1 with the open end 551 of the vertical insertion groove 55 facing downwards. Since the vertically insertable partition member 50 is relatively heavy, it may be installed at the concrete pouring division point P1 while suspended by lifting equipment such as a hoist crane or winch. Near the upper edge 51 of the vertically insertable partition member 50, there is a mooring hole 56 for securing the lifting hook or wire of the lifting equipment.

[0033] Each vertical insertion groove 55 in the vertical insertion-type partition member 50 is a groove designed to prevent interference between the vertical insertion-type partition member 50 and the axial reinforcement of the beam section 12, such as the beam lower reinforcement (main beam reinforcement) T1, beam upper reinforcement (main beam reinforcement) T2, and web reinforcement T4, when the vertical insertion-type partition member 50 is inserted into the concrete pouring division point P1. The vertical insertion groove 55 in the vertical insertion-type partition member 50 allows the axial reinforcement of the beam section 12, such as the beam lower reinforcement (main beam reinforcement) T1, beam upper reinforcement (main beam reinforcement) T2, and web reinforcement T4, to be received into the interior through an open end 551 that opens downwards.

[0034] The reference numeral 421 in Figure 4 indicates the "bottom panel surface" of the bottom formwork 42 of the beam formwork 40. The bottom panel surface 421 corresponds to the upper surface of the bottom formwork 42. The reference numeral 431 indicates the "side panel surface" corresponding to the inner surface of each side formwork 43A, 43B. The bottom panel surface 421 and the side panel surfaces 431 are positioned facing the concrete pouring space 41 for the beam. As shown in Figure 4, the vertical insertion-removable partition member 50 is installed at the concrete pouring division point P1 of the concrete pouring space 41 for the beam, such that its lower edge 52 abuts against the bottom panel surface 421 of the beam formwork 40. The vertical insertion-removable partition member 50 allows the axial reinforcement of the beam 12 (beam lower end reinforcement (main beam reinforcement) T1, beam upper end reinforcement (main beam reinforcement) T2, web reinforcement T4, etc.) to be inserted through the vertical insertion groove 5 By accepting it into position 5, it is possible to partition the concrete pouring area P1 while inserting these reinforcements without interfering with the axial reinforcement.

[0035] Of course, the vertical insertion / removal type partition member 50 can have its specifications, such as the width, position, and number of vertical insertion grooves 55 changed according to the arrangement pattern, position, and number of axial reinforcement bars (beam bottom reinforcement (main beam reinforcement) T1, beam top reinforcement (main beam reinforcement) T2, web reinforcement T4, etc.) of the beam section 12 in the concrete pouring space 41 for the beam section of the formwork 40 for the beam section.

[0036] However, as shown in Figure 4, in each vertical insertion groove 55 of the vertical insertion-type partition member 50, the parts other than those through which the axial reinforcement of the beam section 12 (beam lower end reinforcement (main beam reinforcement) T1, beam upper end reinforcement (main beam reinforcement) T2, web reinforcement T4, etc.) is inserted (hereinafter referred to as "non-reinforcement insertion parts") are open. Therefore, the vertical insertion-type partition member 50 does not partition the concrete pouring space 41 for the beam section with respect to the non-reinforcement insertion parts of each vertical insertion groove 55. In this embodiment, in order to suppress the leakage of concrete through each vertical insertion groove 55 (non-reinforcement insertion parts) of the vertical insertion-type partition member 50 and to increase the degree of partitioning of the concrete pouring separation point P1, a horizontal insertion-type partition member 60 is installed adjacent to the vertical insertion-type partition member 50. The details of the horizontal insertion-type partition member 60 will be described below.

[0037] Figure 5 is a front view of the lateral insertion / removal type partition member 60. The lateral insertion / removal type partition member 60 is designed to be inserted and removed laterally (left and right) from the concrete pouring division point P1 (concrete pouring space 41 for the beam section). The lateral insertion / removal type partition member 60 consists of a first partition member 70A that is inserted and removed laterally from the concrete pouring division point P1 through a first slit 45A formed in the first side formwork 43A of the beam section formwork 40, and a second partition member 70B that is inserted and removed laterally from the concrete pouring division point P1 through a second slit 45B formed in the second side formwork 43B. In other words, the lateral insertion / removal type partition member 60 includes a first partition member 70A that is inserted from one side (left or right) into the concrete pouring division point P1, and a second partition member 70B that is inserted from the other side (left or right) into the concrete pouring division point P1.

[0038] The first partition member 70A of the horizontally insertable partition member 60 is composed of a plurality of first dividing partition plates 81A, 81B, ... divided in the height direction of the concrete pouring division point P1 (concrete pouring space 41 for the beam section). Similarly, the second partition member 70B of the horizontally insertable partition member 60 is composed of a plurality of second dividing partition plates 82A, 82B, ... divided in the height direction of the concrete pouring division point P1 (concrete pouring space 41 for the beam section). In other words, the collection of the plurality of first dividing partition plates 81A, 81B, ... corresponds to the first partition member 70A, and the collection of the plurality of second dividing partition plates 82A, 82B, ... corresponds to the second partition member 70B. The collection of the first partition member 70A and the second partition member 70B corresponds to the horizontally insertable partition member 60.

[0039] Multiple first-division partition plates 81A, 81B, ... are inserted into the concrete pouring division point P1 through the first slit 45A of the first side formwork 43A. Each first-division partition plate 81A, 81B, ... is installed in a manner where there are no gaps between them vertically (see Figure 7). Similarly, multiple second-division partition plates 82A, 82B, ... are inserted into the concrete pouring division point P1 through the second slit 45B of the second side formwork 43B. Each second-division partition plate 82A, 82B, ... is installed in a manner where there are no gaps between them vertically (see Figure 7).

[0040] In the example shown in Figure 5, the first partition member 70A is divided into four sections vertically and includes four first partition plates 81A to 81D. Similarly, the second partition member 70B is also divided into four sections vertically and includes four second partition plates 82A to 82D. However, the first partition member The number of divisions in 70A and the second partition member 70B is not particularly limited. That is, the number of first partition plates 81A, 81B, ... included in the first partition member 70A is not particularly limited. Similarly, the number of second partition plates 82A, 82B, ... included in the second partition member 70B is not particularly limited.

[0041] In this embodiment, the first partition plates 81A, 81B, ... and the second partition plates 82A, 82B, ... are each formed from a steel plate having an overall rectangular shape. For ease of handling, the first partition plates 81A, 81B, ... and the second partition plates 82A, 82B, ... are adjusted to be roughly the same size, but they may be of different sizes.

[0042] Here, reference numeral 811 denotes the inner edge of the first partition plate 81A, 81B, ..., and reference numeral 812 denotes the outer edge of the first partition plate 81A, 81B, .... Reference numeral 821 denotes the inner edge of the second partition plate 82A, 82B, ..., and reference numeral 822 denotes the outer edge of the second partition plate 82A, 82B, .... Reference numeral 813 denotes the upper edge of the first partition plate 81A, 81B, ..., and reference numeral 814 denotes the lower edge of the first partition plate 81A, 81B, .... Reference numeral 823 denotes the upper edge of the second partition plate 82A, 82B, ..., and reference numeral 824 denotes the lower edge of the second partition plate 82A, 82B, ....

[0043] When installing the first dividing partition plates 81A, 81B, etc., at the concrete pouring division point P1, they are inserted into the first slit 45A with the inner edge 811 leading. The first dividing partition plates 81A, 81B, etc., are installed with their upper edge 813 facing upwards and their lower edge 814 facing downwards. Similarly, when installing the second dividing partition plates 82A, 82B, etc., at the concrete pouring division point P1, they are inserted into the second slit 45B with the inner edge 821 leading. The second dividing partition plates 82A, 82B, etc., are installed with their upper edge 823 facing upwards and their lower edge 824 facing downwards.

[0044] In Figure 5, the symbol A1 is the region that is inserted into the concrete pouring space 41 for the beam section when the first dividing partition plates 81A, 81B, ... are installed at the concrete pouring location P1 (hereinafter referred to as the "insertion region"), and the symbol A2 is the region located on the outer edge 812 side of the insertion region A1 (hereinafter referred to as the "non-insertion region"). When the first dividing partition plates 81A, 81B, ... are inserted into the first slit 45A to the specified position, the non-insertion region A2 is located outside the side panel surface 431 of the beam section formwork 40. In Figure 5, a dashed line is drawn between the insertion region A1 and the non-insertion region A2.

[0045] In Figure 5, the symbol B1 represents the area (hereinafter referred to as the "insertion area") that is inserted into the concrete pouring space 41 for the beam section when the second dividing partition plates 82A, 82B, ... are installed at the concrete pouring division point P1, and the symbol B2 represents the area (hereinafter referred to as the "non-insertion area") that is located on the outer edge 822 side of the insertion area B1. When the second dividing partition plates 82A, 82B, ... are inserted into the second slit 45B to the specified position, the non-insertion area B2 is located outside the side panel surface 431 of the beam section formwork 40. In Figure 5, a dashed line is drawn between the insertion area B1 and the non-insertion area B2.

[0046] At least one of the multiple first partition plates 81A, 81B, ... has a horizontal insertion groove 85A through which the axial reinforcement of the beam section 12 (main beam reinforcement T1, T2, web reinforcement T4, etc.) can be inserted. In the example shown in Figure 5, horizontal insertion grooves 85A are formed on the first partition plates 81A, 81B, 81D, but not on the first partition plate 81C. Similarly, at least one of the second partition plates 82A, 82B, ... has a horizontal insertion groove 85B through which the axial reinforcement of the beam section 12 (main beam reinforcement T1, T2, web reinforcement T4, etc.) can be inserted. In the example shown in Figure 5, horizontal insertion grooves 85B are formed on the second partition plates 82A, 82B, 82D. A through groove 85B is formed, but a horizontal insertion groove 85B is not formed in the second dividing partition plate 82C.

[0047] Each horizontal insertion groove 85A, 85B extends to the left and right, with one end being an open end. More specifically, each horizontal insertion groove 85A, 85B is formed as an open end 851 by positioning one end in its extending direction to the inner edges 811, 821, and the other end is formed as a closed end 852. Each horizontal insertion groove 85A, 85B is a groove to avoid interference between the axial reinforcement of the beam section 12 and the first partition member 70A (first dividing partition plate 81A, 81B, ...) and the second partition member 70B (second dividing partition plate 82A, 82B, ...) when they are inserted into the concrete pouring division point P1.

[0048] Furthermore, the non-insertion areas A2 of the first partition plates 81A, 81B, etc., and the non-insertion areas B2 of the second partition plates 82A, 82B, etc., are provided with handle holes 86 and fixing holes 87, respectively. The handle holes 86 are used as handles for workers to carry the first partition plates 81A, 81B, etc. and the second partition plates 82A, 82B, etc., and to grip them when installing or removing them from the concrete pouring space 41 for the beam section. The fixing holes 87 are holes for inserting bolts, shafts, etc., to fix the first partition plates 81A, 81B, etc. and the second partition plates 82A, 82B, etc., which are inserted into the first slit 45A and the second slit 45B, respectively, to the first side formwork 43A and the second side formwork 43B, respectively.

[0049] Figure 6 illustrates the situation of installing the lateral insertion / removal type partition member 60 at the concrete pouring division point P1. Figure 7 illustrates the state after the lateral insertion / removal type partition member 60 has been installed at the concrete pouring division point P1. The lateral insertion / removal type partition member 60, configured as described above, is inserted into the concrete pouring division point P1 from the side, as shown in Figure 6. For example, the first dividing partition plates 81A, 81B, ... are inserted into the concrete pouring division point P1 through the first slit 45A of the first side formwork 43A, in the order of 81B → 81C → 81D, starting from the bottom 81A. Similarly, the second dividing partition plates 82A, 82B, ... are inserted into the concrete pouring division point P1 through the second slit 45B of the second side formwork 43B, in the order of 82B → 82C → 82D, starting from the bottom 82A. In this case, interference is suppressed as the axial reinforcement bars of the beam section 12 (beam bottom reinforcement (main beam reinforcement) T1, web reinforcement T4, etc.) are received from the open ends 851 into the horizontal insertion grooves 85A and 85B of the lateral insertion-removable partition members 60 (first partition member 70A, second partition member 70B).

[0050] Of course, the width, position, and number of horizontal insertion grooves 85A, 85B in the horizontal insertion-type partition members 60 (first partition member 70A, second partition member 70B) can be changed according to the reinforcement pattern, position, and number of axial reinforcement bars in the beam section 12. Also, the number and height dimensions of the first divided partition plates 81A, 81B, etc. included in the first partition member 70A can be changed as appropriate. Similarly, the number and height dimensions of the second divided partition plates 82A, 82B, etc. included in the second partition member 70B can be changed as appropriate.

[0051] Reference numeral 432A in Figure 7 indicates one of a pair of frames erected along the first slit 45A in the first side formwork 43A and positioned opposite each other at a distance equal to the slit width of the first slit 45A. The pair of frames 432A are erected vertically from the side panel surface 431 of the first side formwork 43A, and the gap between the pair of frames 432A communicates with the first slit 45A. Similarly, reference numeral 432B indicates one of a pair of frames erected along the second slit 45B in the second side formwork 43B and positioned opposite each other at a distance equal to the slit width of the second slit 45B. The pair of frames 432B are erected vertically from the side panel surface 431 of the second side formwork 43B, and the gap formed between the pair of frames 432B communicates with the second slit 45B.

[0052] The first partition member 70A (first divided partition plate 81A, 81B, ...) is installed with a non-insertion area A2 inserted into the gap between a pair of frames 432A in the first side formwork 43A. The second partition member 70B (second divided partition plate 82A, 82B, ...) is installed with a non-insertion area B2 inserted into the gap between a pair of frames 432B in the second side formwork 43B. This allows the first partition member 70A (first divided partition plate 81A, 81B, ...) and the second partition member 70B (second divided partition plate 82A, 82B, ...) to be installed in a position parallel to the width direction (lateral direction) of the concrete pouring space 41 for the beam section.

[0053] Furthermore, the first partition member 70A (first dividing partition plate 81A, 81B, ...) and the second partition member 70B (second dividing partition plate 82A, 82B, ...) are installed so that their inner edges 811, 821 (inner edge 811 and inner edge 821) abut against each other when inserted from the first slit 45A and the second slit 45B, thereby partitioning the concrete pouring division point P1. At that time, the inner edges 811, 821 (inner edge 811 and inner edge 821) of the first partition member 70A (first dividing partition plate 81A, 81B, ...) and the second partition member 70B (second dividing partition plate 82A, 82B, ...) abut against each other at the center in the width direction of the concrete pouring division point P1. At that time, when the axial reinforcement bars of the beam section 12 inserted through each horizontal insertion groove 85A, 85B are located at or near the closed end 852, the inner edges 811, 821 of the first partition member 70A (first divided partition plate 81A, 81B, ...) and the second partition member 70B (second divided partition plate 82A, 82B, ...) are configured to abut each other (inner edge 811 and inner edge 821).

[0054] In this way, the first partition member 70A (first dividing partition plate 81A, 81B, ...) and the second partition member 70B (second dividing partition plate 82A, 82B, ...) are installed at the specified positions in the concrete pouring division point P1. For example, the frames 432A and 432B described above have fixing holes 433 formed in positions that overlap with the fixing holes 87 when the first partition member 70A (first dividing partition plate 81A, 81B, ...) and the second partition member 70B (second dividing partition plate 82A, 82B, ...) are inserted to the specified positions in the concrete pouring division point P1 (see Figure 7). Therefore, by inserting a common fixing device 90, such as a shaft or bolt, through the fixing holes 87 provided in the first partition member 70A (first divided partition plate 81A, 81B, ...) and the second partition member 70B (second divided partition plate 82A, 82B, ...) and the fixing holes 433 provided in the frames 432A, 432B, ... the first partition member 70A (first divided partition plate 81A, 81B, ...) and the second partition member 70B (second divided partition plate 82A, 82B, ...) can be easily fixed.

[0055] As described above, the horizontally inserted and removed partition member 60 can partition the concrete pouring division point P1 in cooperation with the vertically inserted and removed partition member 50 while blocking the non-reinforcing bar insertion portions of each vertical insertion groove 55 in the vertically inserted and removed partition member 50. In other words, the formwork 20 according to this embodiment, by combining a vertically inserted and removed partition member 50 that can be inserted and removed in the vertical direction with respect to the concrete pouring division point P1 and a horizontally inserted and removed partition member 60 that can be inserted and removed in the horizontal direction, can reliably partition the concrete pouring division point P1 without interfering with the axial reinforcement of the beam section 12, as shown in Figure 7. In other words, concrete can be poured cleanly at the concrete pouring division point P1 without leakage, improving the concrete quality of the precast concrete beam 10 with joints.

[0056] Furthermore, in the manufacturing method of the precast concrete beam 10 with joints using the formwork 20 described above, reinforcing bars are placed in the concrete pouring space 41 for the beam section and the concrete pouring space 31 for the joint section, and as shown in Figure 7, a vertically insertable partition member 50 and a horizontally insertable partition member 60 are placed at the concrete pouring division point P1. At that time, the vertically insertable partition member 50 is, For example, it is installed along the horizontally insertable partition member 60 (first partition member 70A, second partition member 70B).

[0057] Subsequently, concrete for the beam section is poured into the concrete pouring space 41 for the beam section, and concrete for the joint section is poured into the concrete pouring space 31 for the joint section. The concrete for the beam section and the concrete for the joint section have different strengths, and typically the concrete for the joint section is stronger than the concrete for the beam section. In the manufacturing method of a precast concrete beam 10 with a joint using formwork 20, the pouring order of concretes of different strengths is not particularly limited. Conventionally, in light of the difficulty in pouring concrete without gaps at the concrete pouring division point, it was necessary to pour the high-strength concrete for the joint section first, which restricted the pouring order of concretes of different strengths. In contrast, the formwork 20 according to this embodiment has the advantage that the concrete pouring space can be partitioned without gaps at the concrete pouring division point P1, so the pouring order of concretes of different strengths is not particularly limited. For example, the beam section concrete, which is weaker than the joint section concrete, may be poured before the joint section concrete. Furthermore, it is possible to pour concrete into the concrete pouring space 41 for the beam section all at once up to the top surface height, resulting in excellent workability.

[0058] After the concrete for the beam section is poured into the concrete pouring space 41 for the beam section and the concrete for the joint section is poured into the concrete pouring space 31 for the joint section, the vertically removable partition member 50 and the horizontally removable partition member 60 are withdrawn from the concrete pouring division point P1 in the concrete pouring space 41 for the beam section. In addition, concrete may be poured with extra concrete to account for the drop in the top surface of the concrete after the withdrawal of the vertically removable partition member 50 and the horizontally removable partition member 60, or concrete may be added to fill the area after the withdrawal of the vertically removable partition member 50 and the horizontally removable partition member 60 to account for the drop in the top surface of the concrete. Furthermore, when withdrawing the vertically removable partition member 50 and the horizontally removable partition member 60 from the concrete pouring division point P1, the withdrawal work may be performed while vibrating the concrete after pouring using a vibrator.

[0059] When pulling the vertically inserted partition member 50 upward from the concrete pouring division point P1 against gravity, lifting equipment such as a hoist crane or winch will be used as needed. However, the horizontally inserted partition member 60, which is inserted and removed horizontally from the concrete pouring division point P1, can be inserted and removed manually without the use of lifting equipment, resulting in superior work efficiency and reduced workload. After the horizontally inserted partition member 60 has been pulled out from the concrete pouring division point P1, concrete leakage can be suppressed by sealing the first slit 45A and the second slit 45B with a steel plate or the like. For example, the first slit 45A and the second slit 45B can be easily sealed by inserting a steel plate with the same thickness as the slit width of the first slit 45A and the second slit 45B into the gap between the pair of frames 432A in the first side formwork 43A and the gap between the pair of frames 432B in the second side formwork 43B.

[0060] Furthermore, since the horizontal insertion grooves 85A and 85B in the horizontal insertion-type partition member 60 extend in the left-right direction, they contribute to preventing errors in the placement height of axial reinforcement in the beam section 12 and maintaining dimensions. Also, since the vertical insertion grooves 55 in the vertical insertion-type partition member 50 extend in the up-down direction, they contribute to preventing errors in the placement position of axial reinforcement in the beam section 12 in the width direction of the beam section formwork 40 (beam section concrete pouring space 41) and maintaining dimensions. In other words, when installing the vertical insertion-type partition member 50 and the horizontal insertion-type partition member 60 at the concrete pouring division point P1 of the beam section concrete pouring space 41, if the axial reinforcement in the beam section 12 is placed outside the correct position, it will be difficult to smoothly receive the axial reinforcement into the vertical insertion grooves 55 and horizontal insertion grooves 85A and 85B, so before pouring the concrete... It can detect errors in muscle positioning.

[0061] In this way, by combining the vertically insertable partition member 50 and the horizontally insertable partition member 60, it is possible to check whether the axial reinforcement in the beam section 12 is properly positioned in both the height and width directions of the beam section formwork 40 (concrete pouring space 41 for the beam section). The vertically insertable partition member 50 and the horizontally insertable partition member 60 provide an opportunity to automatically perform reinforcement inspection of the axial reinforcement in the beam section 12, thereby contributing to improving the quality of the precast concrete beam 10 with joints manufactured using the formwork 20.

[0062] Although embodiments of the present invention have been described above, these are merely illustrative examples, and various modifications based on the knowledge of those skilled in the art are possible, as long as they do not deviate from the spirit of the claims. [Explanation of symbols]

[0063] 10. Precast concrete beam with joints 11. Joint section 12...beam section 20...formwork 30...Formwork for joint sections 31. Space for pouring concrete for joints. 40...Formwork for beam section 41. Concrete pouring space for beam section 45A...First Slit 45B...Second Slit 50...Vertical insertion / removal type partition member 55... Vertical insertion groove 60... Horizontal insertion / removal type partition member 70A...First partition member 70B...Second partition member 81A, 81B, 81C, 81D... First partition plate 82A, 82B, 82C, 82D... Second division partition plate 85A, 85B... Horizontal insertion groove P1... Concrete pouring division point

Claims

1. A formwork for manufacturing a reinforced concrete precast concrete beam with a joint, which integrates a joint section and a beam section extending from the joint section, A formwork for a beam section, which extends in a straight line and has an open top, with a concrete pouring space for the beam section formed on its interior, and a formwork for a joint section, which is connected to the end of the formwork for the beam section and has an open top, with a concrete pouring space for the joint section formed on its interior so as to communicate with the concrete pouring space for the beam section, A vertically insertable partition member is inserted vertically into and removed from the concrete pouring location located near the boundary between the concrete pouring space for the beam section and the concrete pouring space for the joint section, The system includes a lateral insertion / removal type partition member that is inserted laterally into and removed from the aforementioned concrete pouring division point, The aforementioned vertical partition member extends vertically, has an open lower end, and has a vertical insertion groove through which the axial reinforcement of the beam can be inserted. The aforementioned lateral insertion-type partition member extends to the left and right, has an open end at one end, and has a lateral insertion groove through which the axial reinforcement of the beam can be inserted. Formwork for manufacturing precast concrete beams with joints.

2. The aforementioned lateral insertion / removal type partition member comprises a first partition member that is inserted laterally into and removed from the concrete pouring division location through a first slit formed in the first side formwork of the beam formwork, and a second partition member that is inserted laterally into and removed from the concrete pouring division location through a second slit formed in the second side formwork which is positioned opposite the first side formwork of the beam formwork. The first partition member and the second partition member are configured to partition the concrete pouring area by bringing their inner edges together when inserted from the first slit and the second slit, and the open end of the horizontal insertion groove is located on the inner edge. Formwork for manufacturing a precast concrete beam with joints as described in claim 1.

3. The inner edges of the first partition member and the second partition member are configured to abut each other at the center in the width direction of the concrete pouring location. Formwork for manufacturing a precast concrete beam with joints as described in claim 2.

4. The other end of the horizontal insertion groove is formed as a closed end, and when the axial reinforcing bar inserted into the horizontal insertion groove is located near the closed end, the inner edges of the first partition member and the second partition member are abutted against each other. Formwork for manufacturing a precast concrete beam with joints as described in claim 2.

5. The first partition member includes a plurality of first dividing partition plates that are divided in the height direction of the concrete pouring division location and can be inserted into and removed from the concrete pouring division location through the first slit, and the horizontal insertion groove is formed in at least one of the plurality of first dividing partition plates. The second partition member includes a plurality of second dividing partition plates that are divided in the height direction of the concrete pouring division location and can be inserted into and removed from the concrete pouring division location through the second slit, and the horizontal insertion groove is formed in at least one of the plurality of second dividing partition plates. With the plurality of first dividing partition plates inserted into the concrete pouring division area through the first slit arranged vertically, and the plurality of second dividing partition plates inserted into the concrete pouring division area through the second slit arranged vertically, The concrete pouring section is partitioned by bringing the inner edges of the first dividing partition plate and the second dividing partition plate together. Formwork for manufacturing a precast concrete beam with joints according to any one of claims 2 to 4.

6. A manufacturing method for a reinforced concrete precast concrete beam with a joint, which integrates a joint portion and a beam portion extending from the joint portion, using the formwork described in claim 1, Reinforcement bars are placed in the concrete pouring space for the beam section and the concrete pouring space for the joint section, and the vertically insertable partition member and the horizontally insertable partition member are placed at the concrete pouring division point. Concrete for the beam section is poured into the concrete pouring space for the beam section, and concrete for the joint section is poured into the concrete pouring space for the joint section. After the concrete is poured, the vertically insertable partition member and the horizontally insertable partition member are removed from the concrete pouring location. A method for manufacturing precast concrete beams with joints.

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