Concrete joint method for beam construction

Abstract

To provide a method for placing / joining concrete in beam construction without restricting construction timing of placing / joining work and preventing slag leakage by forming no gap at a joining part, when partitioning the beam longitudinal direction into prescribed sections and placing / joining concrete.SOLUTION: In construction of a beam, when the beam longitudinal direction is partitioned into prescribed sections and concrete is placed and joined, a placing area of an alternative schedule is provided to the concrete placing / joining portion. Namely, after providing already-placed sections (a first already-placed part 60a and a second already-placed part 60b) separately in the beam longitudinal direction, concrete is placed into an unplaced section between the already-placed sections (the first already-placed part 60a and the second already-placed part 60b) to provide an after-placing part 70. On facing end faces of the first already-placed part 60a and the second already-placed part 60b, a concrete stop form 80 is installed.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a method of pouring concrete in beam construction. For example, when constructing an underground beam, rather than pouring concrete continuously over the entire length of the beam, advance pouring sections (already poured sections) are provided at predetermined intervals, and after concrete pouring in the advance pouring sections (already poured sections) is completed, concrete is poured between adjacent advance pouring sections (already poured sections) to provide a subsequent pouring section, thereby constructing a beam. [Background technology]

[0002] When constructing a long concrete structure such as a beam, it is common to divide the concrete structure at a predetermined interval in the length direction and pour concrete sequentially. In treating such concrete joints, various techniques have been disclosed for preventing the occurrence of slag leakage (a phenomenon in which concrete paste leaks out from gaps in the formwork) at the joints and for facilitating the treatment of the joints (for example, see Patent Documents 1 to 3).

[0003] The technology described in Patent Document 1 relates to a formwork for beam concrete pouring, which aims to easily and quickly form partitions for concrete pouring even after reinforcement has been placed, and to easily remove the formwork. This formwork for beam concrete pouring uses metal plates with notches formed on the sides to receive the reinforcing bars, and the inside of the beam formwork is partitioned by arranging multiple plates so that the reinforcing bars are inserted into the notches and sandwiched between the plates. The metal plates have bars aligned along them, and the upward protruding parts of the bars serve as handles.

[0004] The technology described in Patent Document 2 relates to a method for pouring concrete for a wall structure in which multiple columns and multiple walls are constructed as one unit between the columns. This method for pouring concrete for a wall structure includes the steps of: erecting a pair of side forms for the columns and walls; erecting a flow-stop formwork that extends in the wall thickness direction and reaches a predetermined height from the bottom of the side forms at the approximate center of the wall; and pouring concrete from near the top of the column for each pouring space while sequentially changing the pouring space, thereby pouring concrete in multiple stages within a predetermined pouring time interval without performing pouring joint surface treatment on the surface of the already poured concrete in each pouring space. In the step of pouring concrete, concrete is poured until the center of the poured concrete reaches near the top of the column and the end reaches near the upper end of the flow-stop formwork.

[0005] The technology described in Patent Document 3 relates to a method for forming a concrete structure having a partition material for pouring concrete at joints or for pouring concrete separately. This method for forming a concrete structure involves forming an adhesive layer made of a cement-based adhesive on the front and back surfaces of a partition material having a mesh body with a mesh arranged along a pouring joint surface or a pouring separate surface, so as to seal the mesh. A first concrete material is then poured on one side of the partition material so as to be in contact with the adhesive layer, and a second concrete material is poured on the other side of the partition material so as to be in contact with the adhesive layer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 2683877 [Patent Document 2] Patent No. 6484447 [Patent Document 3] Patent No. 6852993 Summary of the Invention [Problem to be solved by the invention]

[0007] The technology described in Patent Document 1 requires a heavy member (plate) for stopping the concrete, and is unable to deal with positional errors in the main reinforcement. The technology described in Patent Document 2 is simply a lath stopper frame, and the above-mentioned inconveniences cannot be eliminated by using this lath stopper frame. The technology described in Patent Document 3 allows foreign matter other than concrete to get into the beam structure, and there is a risk that the design standard strength of high-strength concrete in particular cannot be guaranteed. This causes problems with the design standard strength of the concrete frame and the sprayed material. Furthermore, the frame must have a certain thickness to prevent cracks, so it is heavy and cannot be easily carried.

[0008] When performing joint construction on large-depth members such as underground beams, the approach must be made from above, which means that gaps are likely to occur at the joints, and there is a risk of concrete paste leaking out of gaps in the formwork (hereinafter referred to as "slag leakage"). Conventional techniques, including those described in the above-mentioned patent documents, are likely to cause gaps at the joints, and further ingenuity is required to prevent slag leakage.

[0009] The present invention has been proposed in consideration of the above-mentioned circumstances, and aims to provide a concrete jointing method that not only does not restrict the timing of construction of the joint, but also prevents gaps from being created at the joint surface, thereby preventing the occurrence of slag leakage, by deliberately providing an unpourished section (following pouring section) sandwiched between already poured sections (preceding pouring section). [Means for solving the problem]

[0010] In order to achieve the above-mentioned object, the concrete jointing method for beam construction according to the present invention has the following features: That is, the concrete jointing method for beam construction according to the present invention is a method for dividing the length of a beam into predetermined sections and jointing concrete when constructing a beam, in which an uncast section is provided between already cast sections, and after casting of concrete in the already cast sections is completed, concrete is cast in the uncast sections to construct an integrated beam.

[0011] More specifically, the present invention is a technology that does not build a beam by continuously pouring concrete, but builds a preliminary pouring section (already poured section) by pouring concrete at intervals along the length of the beam, and then builds a subsequent pouring section by pouring concrete between the preliminary pouring sections (already poured sections), thereby building an integrated beam as a whole.

[0012] Therefore, the method of pouring concrete in beam construction according to the present invention includes the steps of: installing formwork on both sides of the beam construction position at the start side of concrete pouring, installing a concrete stop formwork at the end of the concrete pouring direction to prevent the poured concrete from leaking, and pouring concrete into the space surrounded by the formwork and the concrete stop formwork to construct a first advance pouring section; installing formwork on both sides of the beam construction position a predetermined distance away from the first advance pouring section, installing a concrete stop formwork to prevent the poured concrete from leaking, facing the first advance pouring section, and pouring concrete into the space surrounded by the formwork and the concrete stop formwork to construct a second advance pouring section; and installing formwork on both sides of the beam construction position between the first advance pouring section and the second advance pouring section, and pouring concrete into the space surrounded by the formwork, the first advance pouring section, and the second advance pouring section to construct a subsequent pouring section.

[0013] In addition, in the above-mentioned concrete jointing method, the concrete stop formwork used in the first and second preliminary pouring sections consists of a horizontal plate section in a substantially horizontal direction that is installed to avoid the placed reinforcing bars, and a vertical plate section that is overlapped with the horizontal plate section to close the gap that has occurred between the horizontal plate section and the placed reinforcing bars, and the formwork installed between the first and second preliminary pouring sections can be constructed from a plate material that is stretched across and fixed to the outer surfaces of the first and second preliminary pouring sections.

[0014] In the above-mentioned concrete pouring method, the concrete stop formwork can be attached to an auxiliary member for setting the formwork using an attachment member, and fixing members for fixing the formwork can be embedded in the outer surfaces of the first and second preliminary pouring sections. The attachment member can be, for example, a clamp with a roughly U-shaped cross section, which sandwiches the concrete stop formwork and the vertical battens, and attaches and fixes the concrete stop formwork to the vertical battens. The attachment member can also be a nail or a screw that hammers the concrete stop formwork into the vertical battens. The fixing member can be, for example, an insert.

[0015] In the above-mentioned concrete jointing method, the intermediate position between the end face of the first preliminary casting section and the end face in the concrete pouring direction of the second preliminary casting section facing the end face of the first preliminary casting section is preferably a distance of 1 / 4L from the column side end face of the first preliminary casting section (the end face opposite the end face facing the second preliminary casting section) with respect to the distance L between a pair of columns spanning the beam. Furthermore, the end face of the first preliminary casting section and the end face of the second preliminary casting section are preferably spaced apart by 600 to 1,000 mm.

[0016] The area around 1 / 4 of the distance between a pair of columns that span a beam is a position where the effect of bending stress on the beam is small, and by making this position approximately the center of the trailing concrete pouring section, the action of stress on the beam does not interfere with the pouring joint surface. In addition, the reason why the distance between the end face of the first leading concrete pouring section and the end face of the second leading concrete pouring section (the length of the trailing concrete pouring section) is set to 600 to 1,000 mm is so that a worker can enter the trailing concrete pouring section and install a concrete stop formwork. In other words, 600 to 1,000 mm is the appropriate distance for a worker to enter the trailing concrete pouring section and perform work. Effect of the Invention

[0017] According to the concrete joint method for beam construction of the present invention, by deliberately not making the concrete joints continuous, in the case of a cross section with a large beam depth, a worker can enter the joint area and set up a concrete stop formwork in the cross section where the joint is desired, and in the case of a cross section with a small beam depth, a concrete stop formwork can be set up directly from the side of the joint area in the cross section where the joint is desired, so that the construction accuracy of the concrete stop formwork can be improved and the leakage of slag from the joint surface can be minimized. Furthermore, the construction timing of the joint treatment is not restricted, and a flexible construction plan can be made.

[0018] In addition, by embedding a fixing member (e.g., an insert) for fixing the formwork in the advance casting section, the formwork can be reliably installed in the subsequent casting section regardless of the skill of the worker (formwork carpenter) who installs the formwork, thereby shortening work time and improving construction quality.

[0019] In addition, by appropriately setting the positional relationship between the advance concrete pouring section and the follow-up concrete pouring section, a beam can be constructed with the designed strength. [Brief description of the drawings]

[0020] [Figure 1]FIG. 2 is a schematic diagram showing a state where a concrete joint is formed by a concrete joint method according to an embodiment of the present invention, as viewed from above. [Diagram 2] FIG. 1 is an explanatory diagram (1) illustrating the steps of a concrete joint method according to an embodiment of the present invention. [Diagram 3] FIG. 2 is an explanatory diagram (2) illustrating the steps of the concrete joint method according to the embodiment of the present invention. [Figure 4] FIG. 3 is an explanatory diagram illustrating the steps of the concrete joint method according to the embodiment of the present invention. [Diagram 5] FIG. 4 is an explanatory diagram illustrating the steps of the concrete joint method according to an embodiment of the present invention. [Figure 6] FIG. 2 is an explanatory diagram showing a joint portion when a slab is present in the concrete joint method according to the embodiment of the present invention. [Figure 7] 1 is a schematic diagram of a concrete stop formwork to be installed at a joint by a concrete joint method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a concrete joint method according to an embodiment of the present invention will be described with reference to the drawings. concrete Fig. 1 shows a schematic diagram of a concrete joint as viewed from above, Figs. 2 to 5 are explanatory diagrams for explaining the steps of the concrete joint method, and Fig. 6 shows a concrete joint method. teeth FIG. 7 is a schematic diagram of a concrete retaining formwork, and is an explanatory diagram showing a pouring joint when a slab is present.

[0022] <Outline of concrete joint method> As shown in Figures 1 to 7, the concrete joint method of an embodiment of the present invention is characterized in that when constructing a beam, a separate pouring area is provided at the concrete joint, so that in the case of a cross-section with a large beam depth, workers can enter the joint, and in the case of a cross-section with a small beam depth, a concrete stop formwork can be installed from the side of the joint directly at the cross-section where the joint is to be poured.

[0023] This concrete joint method can flexibly deal with errors in the position of the main reinforcement bars, and is highly versatile because the materials used in the joints (concrete stop formwork, etc.) can be made of plywood. It also makes it possible to almost completely eliminate slag leakage. Furthermore, the concrete stop formwork can be removed without any problems, and there is no risk of a weak structure being created in the concrete joints, or of lath being exposed, which could lead to rust.

[0024] <Construction of beam members> The concrete pouring method of the present invention is a method applied when constructing a continuous beam member between a pair of columns by dividing the beam member into predetermined sections and pouring concrete in multiple steps, rather than pouring concrete in one step along the entire length of the beam member. This concrete pouring method comprises a preliminary pouring section provided at an interval and a subsequent pouring section provided between adjacent preliminary pouring sections.

[0025] <Installation of reinforcement and formwork> In a conventional beam member construction method, first, the necessary reinforcement is arranged in the beam member. Then, formwork is installed to regulate both sides of the beam member, and a damming member (such as an air fence) is attached to the concrete joint to hold back the concrete. Concrete is poured into the space enclosed by the formwork and the damming member. In the concrete joint method according to the present invention, the process of arranging the necessary reinforcement in the beam member and the process of placing an auxiliary member for setting the formwork are almost the same as in the conventional beam member construction method.

[0026] Specifically, as shown in FIG. 1, single pipes 20 are installed as auxiliary members for installing formwork 10 on both sides of the concrete pouring section, so as to be located on both sides of the beam member in the length direction, and vertical battens 40 are installed at a predetermined interval inside the single pipes 20 that face each other across the reinforcement section 30. Then, plastic cones 51 and separators 52, which are spacing regulation members 50 for regulating the interval between the formwork 10 that faces each other across the reinforcement section 30, are installed, and formwork 10 made of plate material is installed between the vertical battens 40 that face each other across the reinforcement section 30 in the length direction of the beam member. The spacing regulation members 50 are fixed to the single pipes 20 that face each other across the reinforcement section 30 using fastening metal fittings 53 and hung across them, thereby regulating the interval between the formwork 10 (width of the beam member). The process up to this point is almost the same as the conventional method of constructing beam members.

[0027] The concrete jointing method of the present invention differs from the conventional technology in that, after constructing the leading pouring sections 60 (60a, 60b) in which concrete is poured at intervals, and the leading pouring sections 60 (60a, 60b), concrete is poured between adjacent leading pouring sections 60 (60a, 60b) to provide a trailing pouring section 70. Furthermore, the concrete jointing method of the present invention is also characterized by the concrete stop formwork 80 installed at the joint between the leading pouring sections 60 (60a, 60b) and the trailing pouring section 70, and the installation method thereof.

[0028] In Figs. 2 to 6, in order to facilitate understanding of the leading casting section 60 (60a, 60b) and the trailing casting section 70, formwork 10 installed on both sides of the trailing casting section 70 is illustrated, but formwork 10 installed on both sides of the leading casting section 60 is not illustrated. When pouring concrete in the leading casting section 60 (60a, 60b), formwork 10 is installed on both sides and removed after the concrete has hardened, which is almost the same as the conventional method of constructing beam members. Also, in each figure, the arrangement of members and the number of reinforcing bars may differ to facilitate explanation, but the basic configuration of each member is the same.

[0029] <Pre-casting section> The advance casting section 60 is composed of a first advance casting section 60a where concrete is cast first, and a second advance casting section 60b where concrete is cast with a gap between the first advance casting section 60a and the first advance casting section 60a. A concrete stopper formwork 80 is installed on the end face (end) of the first advance casting section 60a and the end face (end) of the second advance casting section 60b facing the end face (end) of the first advance casting section 60a. Then, concrete is cast in the gap between the concrete stopper formwork 80 and formwork (not shown) installed on both sides of the beam in the length direction of the beam, to construct the first advance casting section 60a and the second advance casting section 60b.

[0030] <Concrete retaining formwork> The concrete stop formwork 80 is a member that is installed at the end face (small end) of the first preliminary casting section 60a and the end face (small end) of the second preliminary casting section 60b to prevent the concrete poured in each preliminary casting section 60 (60a, 60b) from leaking out, and is installed to avoid the placed reinforcing bars 90. That is, as shown in FIG. 7, the concrete stop formwork 80 is composed of a horizontal plate part 81 that is installed in a substantially horizontal direction to avoid the placed reinforcing bars 90, and a vertical plate part 82 that overlaps with the horizontal plate part 81 to close the gap that occurs between the horizontal plate part 81 and the reinforcing bars 90. For example, a plywood board is used for this concrete stop formwork 80.

[0031] In this embodiment, first, the horizontal plate portion 81 is installed so as to avoid the reinforcing bars 90 (main bars, abdominal bars, etc.). The horizontal plate portion 81 is divided into multiple parts in the vertical direction to avoid the reinforcing bars 90. Next, the vertical plate portion 82 to be overlapped with the horizontal plate portion 81 is installed. The vertical plate portion 82 is divided into multiple parts in the left-right direction to avoid the reinforcing bars 90. In this way, by overlapping the horizontal plate portion 81 and the vertical plate portion 82, the reinforcing bars 90 are sandwiched between them, and the concrete can be blocked at the end face (small end) of the first advance casting portion 60a and the end face (small end) of the second advance casting portion 60b. Note that the horizontal plate portion 81 is not only installed horizontally, but may be installed diagonally horizontally depending on the position of the arranged reinforcing bars 90, and the vertical plate portion 82 is not only installed vertically, but may be installed diagonally vertically depending on the position of the arranged reinforcing bars 90.

[0032] <Mounting parts> The concrete stop formwork 80 is attached (fixed) to the auxiliary member for installing the formwork 10 by using the mounting member 100. The auxiliary member for installing the formwork 10 is, for example, the single pipe 20 installed so as to be located on both sides of the beam member in the length direction of the beam member, and the vertical battens 40 installed at a predetermined interval inside the single pipe 20 facing each other across the reinforcing bar 30. Specifically, the concrete stop formwork 80 is attached and fixed by driving nails (not shown) into the vertical battens 40 from the outside (the rear casting section 70 side) of the horizontal plate section 81 or the vertical plate section 82 constituting the concrete stop formwork 80 or by screwing screws (not shown). Furthermore, the concrete stop formwork 80 can be firmly fixed to the vertical battens 40 by attaching a clamp member with a U-shaped cross section that functions as the mounting member 100 between the upper part of the concrete stop formwork 80 and the vertical battens 40.

[0033] <Fixing material> The fixing member 110 for fixing the formwork 10 of the trailing concrete pouring section 70 is a member for fixing the formwork 10 to both sides of the first leading concrete pouring section 60a and the second leading concrete pouring section 60b after the casting of the first leading concrete pouring section 60a and the second leading concrete pouring section 60b is completed, and is made of, for example, a SUS insert. This fixing member 110 is embedded in both sides of the first leading concrete pouring section 60a and the second leading concrete pouring section 60b when concrete is poured in the first leading concrete pouring section 60a and the second leading concrete pouring section 60b. To embed the fixing member (insert) 110, it is sufficient to attach the fixing member (insert) 110 to the inner surface of the formwork 10 in advance using an insert mounting member (not shown) or the like. Although not shown in the figure, the insert is, for example, a cylindrical member with a bottom, with a female thread portion provided on the inner surface, and its open end is positioned on the outer surface of the first pre-casting portion 60a and the second pre-casting portion 60b.

[0034] In addition, a bolt insertion hole (not shown) is opened in the formwork 10 of the following concrete casting section 70 at a position facing the insert, which is the fixing member 110. Then, as shown in Fig. 4, after removing (de-molding) the formwork (not shown) of the first preceding concrete casting section 60a and the second preceding concrete casting section 60b, a fixing bolt 120 is inserted into the bolt insertion hole provided in the formwork 10 of the following concrete casting section 70, and the tip of the fixing bolt 120 is screwed into the insert, which is the fixing member 110, so that the formwork 10 of the following concrete casting section 70 can be attached and fixed to both side surfaces of the first preceding concrete casting section 60a and the second preceding concrete casting section 60b.

[0035] <Subsequent concrete pouring section> The trailing casting section 70 is constructed by placing concrete after the formwork 10 is installed between the first leading casting section 60a and the second leading casting section 60b. Pouring of concrete in the trailing casting section 70 is completed within 2 to 3 days, for example, after pouring concrete in the first leading casting section 60a and the second leading casting section 60b, and within about one week at most. In addition, gaps (casting joints) are provided in the casting joint surfaces of the first leading casting section 60a and the trailing casting section 70 and the casting joint surfaces of the second leading casting section 60b and the trailing casting section 70, and the casting joints are filled with a sealant or the like to ensure sufficient adhesion between the casting joint surfaces and to waterproof the intrusion of rainwater, etc. The pouring joint is formed, for example, by placing a square timber 130 on the upper part of the end face (small end) of the first advance pouring section 60a and the end face (small end) of the second advance pouring section 60b, as shown in Figures 2, 3 and 6.

[0036] <Positional relationship between the leading concrete pouring section and the trailing concrete pouring section> The midpoint between the end face (end) of the first preceding casting section 60a and the end face (end) in the concrete pouring direction of the second preceding casting section 60b facing the end face (end) of the first preceding casting section 60a is 1 / 4L from the column side end face of the first preceding casting section 60a (the end face opposite the end face facing the second preceding casting section 60b), where L is the distance between a pair of columns across which a beam is spanned (column-to-column span). The column side end face of the first preceding casting section 60a refers to the column-beam joint of the first preceding casting section 60a, as shown in Figures 2 to 6. The end face (end) of the first preceding casting section 60a and No. 2. Pre-casting section 60 b The end face (small end) of each of the preceding concrete pouring sections 60a and 60b is 600 to 1,000 mm away (300 to 500 mm away from the midpoint in the longitudinal direction of the following concrete pouring section 70). In other words, if the span between a pair of columns across which the beam is placed is L, the sum of the length of the midpoint of the following concrete pouring section 70 and the length of the second preceding concrete pouring section 60b is 3 / 4L. In addition, the distance between the first preceding concrete pouring section 60a and the second preceding concrete pouring section 60b (the length of the following concrete pouring section 70) is 600 to 1,000 mm.

[0037] <Beam concrete pouring procedure> The procedure for constructing a beam using the concrete pouring method of the present invention will be described with reference to Figures 2 to 6. To construct a beam using the concrete pouring method of the present invention, as shown in Figure 2, a square timber 130 and a concrete stop formwork 80 are installed at the end face (end) of the first advance pouring section 60a. If a slab 140 exists at the location where the beam is to be constructed, as shown in Figure 6, the square timber 130 and the concrete stop formwork 150 are installed at the end face (end) of the slab 140, and the square timber 130 and the concrete stop formwork 80 are installed at the end face (end) of the first advance pouring section 60a in the same manner as shown in Figure 2.

[0038] Once the concrete stop formwork 80 has been installed on the end face (small end) of the first prior casting section 60a, concrete is poured into the first prior casting section 60a as shown in Fig. 3. Then, after a predetermined number of days (e.g., one day) have passed or on the same day, as shown in Figs. 3 and 4, a square timber 130 and the concrete stop formwork 80 are installed on the end face (small end) of the second prior casting section 60b in the concrete pouring direction, in the same way as the first prior casting section 60a, and concrete is poured into the second prior casting section 60b.

[0039] In this embodiment, as shown in Fig. 1, when the concrete stop formwork 80 is installed on the end face (small end) of the first preceding casting section 60a and the end face (small end) of the second preceding casting section 60b, the worker 160 can enter and work within the space between the first preceding casting section 60a and the second preceding casting section 60b (the casting position of the following casting section 70). Also, in the case of a cross section with a small beam depth, the concrete stop formwork 80 is installed directly from the side of the joint area at the cross section where the joint is to be performed.

[0040] When pouring of concrete is completed in the first and second preceding pouring sections 60a and 60b and a prescribed curing period has elapsed, the concrete stopper formwork 80 installed at the end face (end) of the first and second preceding pouring sections 60a and 60b, and the formwork (not shown) installed on the sides of the first and second preceding pouring sections 60a and 60b are removed (removed from the formwork). The concrete stopper formwork 80 is fixed to the vertical battens 40 by combining horizontal plate parts 81 and vertical plate parts 82, so it can be easily disassembled and removed from the formwork.

[0041] Fixing members (inserts) 110 are embedded in both sides of the first leading concrete casting section 60a and the second leading concrete casting section 60b. The formwork 10 of the trailing concrete casting section 60b is attached using the fixing members (inserts) 110. That is, as shown in FIG. 4, a fixing bolt 120 is inserted into a bolt insertion hole (not shown) provided in the formwork 10 of the trailing concrete casting section 70, and the tip of the fixing bolt 120 is screwed into the fixing member 110, which is the insert, to attach and fix the formwork 10 of the trailing concrete casting section 70 to both sides of the first leading concrete casting section 60a and the second leading concrete casting section 60b.

[0042] Once the formwork 10 is attached to both sides of the trailing concrete pouring section 70, concrete is poured into the trailing concrete pouring section 70. After a prescribed curing period has elapsed, the formwork 10 is removed to complete the construction of the trailing concrete pouring section 70. By following the above-described procedure, a beam can be constructed in which the first leading concrete pouring section 60a, the trailing concrete pouring section 70, and the second leading concrete pouring section 60b are continuous, as shown in FIG.

[0043] In general, when constructing a beam by pouring concrete, it is necessary to make the joint at a position where the influence of bending stress on the beam is small. Therefore, in this embodiment, the intermediate position between the end face (end) of the first preceding pouring section 60a and the end face (end) of the second preceding pouring section 60b in the concrete pouring direction facing the end face (end) is set to about 1 / 4 of the interval (span L) between the columns (about 1 / 4L from the end face of the first preceding pouring section 60a on the column side). In addition, the interval between the first preceding pouring section 60a and the second preceding pouring section 60b (the length of the following pouring section 70) is set to 600 to 1,000 mm so that a worker can enter the interval between the first preceding pouring section 60a and the second preceding pouring section 60b and perform work such as installing a concrete stop formwork 80, as shown in FIG. 1.

[0044] <Differences from conventional technology> Conventionally, when concrete is poured to construct a beam, the concrete is poured continuously. In other words, in conventional concrete pouring methods, concrete is poured in the next pouring section in succession to the pouring section where concrete has already been poured, and there was no construction method in which an unpouring section is provided between the previously poured sections provided separately, as in the present invention. This is not due to structural reasons, but because the pouring method has become customary and the idea of ​​providing an unpouring section between the previously poured sections has not occurred to the person.

[0045] The inventor has found that even if an unplaced section (following pouring section 70) is provided between already placed sections (leading pouring sections 60a, 60b), no structural problems will occur if concrete is poured in the unplaced section (following pouring section 70) immediately (for example, after 2 to 3 days). The inventor then came up with the idea of ​​the present invention by noting that when an unplaced section (following pouring section 70) is provided between already placed sections (leading pouring sections 60), the work of installing the concrete stop formwork 80 can be easily performed.

[0046] That is, the present invention is based on the idea of ​​providing a pouring section where concrete is poured on a different schedule at the pouring joint, which has never existed before, and by installing the concrete stop formwork 80 directly at the cross section of the pouring joint, it is possible to flexibly respond to errors in the placement of the main reinforcement and the web reinforcement. In addition, since plywood can be used as the concrete stop formwork 80, versatility can be increased.

[0047] Furthermore, not only can the leakage of sludge from the concrete stop formwork 80 be almost completely eliminated, but the concrete stop formwork 80 can also be easily removed, and since there is no fragile structure at the concrete pouring joint and the lath is not exposed, rust is not induced.

[0048] Although there are techniques for pouring concrete in separate processes at the connection between concrete beams and columns, these techniques are techniques related to joint structures or techniques for improving the cross-sectional performance of concrete connections. Therefore, these conventional techniques are based on ideas different from those of the present invention, and are not intended to achieve the above-mentioned effects unique to the present invention by deliberately providing an unconcreted section (following concrete pouring section 70) between already-concreted sections (preceding concrete pouring sections 60a, 60b) and pouring concrete in multiple concrete pouring sections on separate schedules, as in the present invention. [Explanation of symbols]

[0049] 10 Formwork 20 Single Pipe 30 Reinforcement section 40 Vertical crosspiece 50 Spacing regulation members 51 Plastic Cone 52 Separator 53 Fastening hardware 60 Pre-casting section 60a First preliminary concrete section 60b Second pre-cast section 70 Trailing concrete pouring section 80 Concrete retaining formwork 81 Horizontal plate part 82 Vertical plate 90 Steel Bar 100 Mounting material 110 Fixing member 120 Fixing bolt 130 Squared timber 140 Slab 150 Slab concrete stop formwork 160 workers

Claims

1. A method for pouring concrete into a beam by dividing the beam into predetermined sections in the longitudinal direction when constructing the beam, comprising the steps of: A process of installing formwork on both sides of the beam construction position at the start side of concrete pouring, installing a concrete stop formwork at the end of the concrete pouring direction to prevent the poured concrete from leaking out, and pouring concrete into the space surrounded by the formwork and the concrete stop formwork to construct a first advance pouring section; a step of installing formwork on both sides of the beam construction position at a predetermined distance from the first advance casting section, installing a concrete stop formwork facing the first advance casting section to prevent poured concrete from leaking out, and pouring concrete into the space surrounded by the formwork and the concrete stop formwork to construct a second advance casting section; A process of installing formwork on both sides of a beam construction position between the first and second preceding casting sections, and pouring concrete into a space surrounded by the formwork, the first and second preceding casting sections to construct a following casting section; A method for pouring concrete joints in beam construction, comprising:

2. The concrete stop form used in the first and second preliminary casting sections includes a horizontal plate portion in a substantially horizontal direction that is installed to avoid the arranged reinforcing bars, and a vertical plate portion that is overlapped with the horizontal plate portion to close a gap that occurs between the horizontal plate portion and the arranged reinforcing bars, The formwork installed between the first and second preliminary casting sections is made of a plate material fixed across the outer surfaces of the first and second preliminary casting sections.

2. A method for pouring concrete joints in beam construction according to claim 1.

3. The concrete stop form is attached to an auxiliary member for installing the form using an attachment member, A fixing member for fixing the formwork is embedded in the outer surfaces of the first pre-casting section and the second pre-casting section.

3. A method for pouring concrete joints in beam construction according to claim 1 or 2.

4. The intermediate position between the end surface of the first preceding casting section and the end surface of the second preceding casting section facing the end surface of the first preceding casting section is 1 / 4L from the column side end surface of the first preceding casting section with respect to the distance L between a pair of columns spanning the beam. A method for pouring concrete joints in beam construction according to any one of claims 1 to 3.

5. The end surface of the first pre-casting section and the end surface of the second pre-casting section are spaced apart by 600 to 1,000 mm. A method for pouring concrete joints in beam construction according to any one of claims 1 to 4.

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