JP4392462B1 - Construction method of beam form unit, lateral fastening frame for beam form unit and cast-in-place reinforced concrete beam - Google Patents

Abstract

The present invention provides a lateral fastening bracket capable of easily performing cast-in-place reinforced concrete beams.
When building a reinforced concrete beam by placing a beam formwork around a rebar frame and then placing concrete in the interior, first, the outer surface of each of the three formwork panels 4a, 4b, 4c A plurality of horizontal crosspieces are fixed side by side over the entire length in the longitudinal direction, and the formwork panel set with horizontal crosspieces formed by combining these formwork panels in a groove shape, and the formwork panel set with horizontal crosspieces A beam-type frame unit 1 comprising a plurality of telescopic horizontal fastening frames 5 each of which is formed in a U-shape, each of which is open upwards, is positioned at a plurality of positions in the longitudinal direction and tightened from both sides to form a beam-type frame. By assembling in advance and raising the assembled beam form unit as it is and combining it from below with the rebar frame, the beam form frame is disposed on the rebar frame, so The construction of the REIT beams.
[Selection] Figure 3

Description

  The present invention relates to a beam form unit, a horizontal fastening frame for a beam form unit, and a method for constructing a cast-in-place reinforced concrete beam, and in particular, a place where concrete is placed around a rebar frame arranged at a construction site. The technology related to the cast-in-place reinforced concrete beam is proposed.

  Conventionally, cast-in-place reinforced concrete beams and precast concrete beams are used for constructing civil engineering structures such as large buildings and bridges. Of these, precast concrete beams are used to produce a large amount of standardized products at the factory. For this reason, although there is an advantage that the quality is constant, it has to be transported to the construction site by a transportation means such as a truck, so that the size is limited and it is not suitable for a particularly large structure.

  On the other hand, cast-in-place reinforced concrete beams are generally constructed by welding spiral bars (hoop bars) around the main bars that form the main part of the reinforced concrete beam to construct a beam-shaped reinforcing bar frame with a rectangular cross section. It is constructed by placing the beam form frame around the reinforcing bar frame and fixing it, and then placing concrete inside the beam form frame. For this reason, since it is constructed at the construction site, there is no transportation restriction and it is used to build large structures.

  When constructing such a reinforced concrete beam on site, first of all, first, a hoop bar is provided around the main bars (bars) that are installed horizontally between the columns so as to form a horizontal rectangular parallelepiped. On the other hand, a plurality of horizontal crosspieces called trusses that span the entire length in the longitudinal direction are fixed side by side on the outer surface of the three formwork panels for receiving the load of the concrete, and then around the reinforcing bar frame The three formwork panels are disposed (built) in a groove shape, and the two side formwork panels facing each other are connected to each other by a separator and held at a predetermined interval. After that, at each of the longitudinal direction of the form panel with horizontal crosspieces assembled in the groove shape, the vertical flap material is applied to the horizontal crosspiece from both sides and the horizontal flap material is applied from below. The lower end portions of the two are connected with a horizontal butterfly material, and the vertical butterfly materials are fastened with the separator to fix the three formwork panels in a groove-like frame shape.

  However, the above-described conventional beam-type frame and a method for constructing a reinforced concrete beam using the same have the following problems. That is, since the separator is disposed so as to cross the reinforcing bar frame in the concrete placement space formed by the three formwork panels, the workability of the construction is poor. In addition, since the separator is arranged so as to cross the beam formwork, if the beam formwork body is lifted from below and combined with the rebar frame assembled at the construction position of the beam, the separator becomes in the way of the work. I could not. Therefore, in the construction of the conventional beam formwork, it is necessary to arrange and assemble the formwork panel sequentially below and on both sides of the rebar frame, which increases the man-hours. This hinders the simultaneous execution of the work and the assembly work of the beam form frame, which has been an obstacle to shortening the work period.

  In addition, when a large number of separators are incorporated into the installed formwork panel, it is necessary to insert the separators between the main bars and the hoop bars, and there is a problem that skilled techniques are required for attaching the separators.

  In order to solve such inconveniences of the prior art, beam-type frames disclosed in Patent Document 1 and Patent Document 2 have been proposed and disclosed in these documents. All beam-type frames are proposed for beam-type frames for cast-in-place concrete beams with floor slabs.

  The beam-type frame described in Patent Document 1 is supported by a supporting work and extends perpendicularly to the longitudinal direction of the beam below the both sides of the beam construction position. The horizontal members are fixed horizontally, and on each horizontal member, two horizontal flaps are fixed on both sides of the beam construction position so as to be movable along the horizontal members. The bottom ends of the two vertical butterfly members arranged above the inner end of each are pivotally supported by these horizontal butterfly members so that they can swing in the approach and separation directions with respect to the construction position of the beam. An elastic stopper is stretched diagonally between the butter material and the horizontal butter material that pivots it, so that the swing angle of each vertical butter material can be adjusted. And a U-shaped horizontal fastening frame opened upward. Then, three formwork panels for receiving a concrete load are arranged in a groove shape in the horizontal fastening frames so as to straddle between the horizontal fastening frames at the above-mentioned plurality of places on the large pull, By attaching a plurality of horizontal crosspieces fixed side by side to the outer surface of the formwork panel over the entire length in the longitudinal direction, the three formwork panels are formed in a groove shape Fix in a frame shape. Since there is no separator that crosses the inside of the beam form frame, this beam form body can be combined with the reinforcement frame by lifting it from below with a support. After the concrete placed in the beam form is hardened, By moving the horizontal butterfly material in a direction away from each other on the horizontal member and lowering the entire beam-type frame by supporting work, the concrete beam can be easily removed from the beam-type frame.

  In addition, in the beam form frame described in Patent Document 2, three form form panels for receiving a concrete load are arranged in a groove shape, and a plurality of form form panels are provided on the outer surfaces of the form form panels over the entire length in the longitudinal direction. The vertical piers on both sides and the lower horizontal pier are respectively attached to a plurality of locations in the longitudinal direction of the main and fixed horizontal piers, and two horizontal members are pivotally supported on the horizontal piers so as to be swingable in the vertical direction. Then, the lower ends of the vertical piers on both sides are respectively connected to the two cross members at right angles, and long bolts penetrating over the cross members are provided above the pivots of the cross members. Then, the two cross members are tightened in the approaching direction with the long bolts to tighten the vertical crosspieces on both sides, and the three formwork panels are fixed to the groove-shaped frame shape. Since this beam form frame does not have a separator that crosses the beam form frame, it can be combined with the rebar frame by lifting it from below with a support. After the concrete placed in the beam form is hardened, it is long. The concrete beam can be easily removed from the beam frame by loosening the bolt and swinging the two movable cross members away from each other and lowering the entire beam frame with a support. .

JP 2002-364170 A JP 2008-261142 A

  However, the techniques described in these documents 1 and 2 are such that the vertical piers on both sides are pivotally supported by movable crosspieces and horizontal piers, both of which can be swung in the approaching / separating direction of each other. Therefore, there is a problem that it takes time to work on the tensioning (right angle, vertical / horizontal) at the time of forming the formwork, and it is difficult to accurately assemble (assemble and fix) and man-hours are required.

  Further, the technique described in Document 1 has a small range in which the movable cross member can be moved, and the movement is merely for performing the relaxation necessary for demolding and fine adjustment at the time of tightening. It does not have a structure that expands and contracts greatly enough to accommodate various beam thicknesses (600 × 800 mm, 900 × 1200 mm, etc.).

  On the other hand, although the technique described in Document 2 is provided with a plurality of holes through which the pivot of the cross member is inserted, the range in which the cross member can be moved is increased to some extent, but the thickness of the beam to be installed is changed. It is necessary to change the insertion hole of the pivot of the cross member according to the thickness of the beam, and it takes time, and the thickness of the beam is regulated by the position of the hole that penetrates the pivot so that fine adjustment cannot be performed. There was a problem.

  Therefore, the object of the present invention is not only to easily perform cast-in-place reinforced concrete beams, but also to accurately and quickly build the beam formwork. In addition to being able to cope with various types of horizontal fastening brackets, it is intended to be able to accurately perform tensioning (perpendicular, vertical / horizontal).

  As a result of earnestly researching a technique that can overcome the above-described problems of the prior art and that can surely realize the above-mentioned object, the present inventor relates to the following summary configuration as an effective technique. The present invention has been conceived.

That is, the present invention is a beam formwork unit used for constructing a reinforced concrete beam, in which a plurality of horizontal crosspieces are fixed side by side over the entire length in the longitudinal direction on the outer surface of each of the three formwork panels. A formwork panel set with horizontal crosspieces formed by combining these formwork panels into a groove shape, and a plurality of longitudinal direction positions of the formwork panel set with horizontal crosspieces are positioned and tightened from both sides to form a beam formwork. A plurality of telescopic horizontal fastening frames each having an U-shape that is open upward, and the horizontal fastening frames are arranged along the bottom formwork panel of the formwork panel set with the transverse crosspieces. has been one and horizontal connecting pipes you support the formwork panels of the bottom portion, the transverse桟木with formwork panel set form panels thereof both sides are arranged along the form panels on both sides of the to support the And three connection pipes between the two vertical connection pipes, both arms are fitted telescopically each inside of the transverse connecting pipe and said vertical connection pipe, constituting the corner portions of the lateral clamping frame The two right angle elbows facing each other, the two vertical elbows passing through each of the right angle elbows and the vertical connection pipe to which the right angle elbow is fitted, and the two right angle elbows And three through-rods with one through-hole passing through the transverse connecting pipe fitted with the right-angle elbows, and a clamping nut attached to the through-rods, A beam formwork unit is proposed in which the fitting length between the right angle elbow and the connection pipe can be adjusted by changing the tightening position of the tightening nut according to the size of the beam formwork.

Further, the present invention is a horizontal crosspiece constructed by fixing a plurality of horizontal crosspieces side by side over the entire length in the longitudinal direction on the outer surface of each of the three formwork panels and combining these formwork panels in a groove shape. In the telescopic horizontal fastening frame having an upwardly open U-shape, positioning each of a plurality of longitudinal positions of the attached formwork panel set and tightening from both sides to form a beam formwork, the formwork with the horizontal crosspiece one and horizontal connecting pipes you support the formwork panels of the bottom portion is disposed along the formwork panel of the bottom of the panel assembly, to form panels on both sides of the transverse桟木with formwork panel sets two and three connection pipes between the vertical connection pipe that along with being arranged to support the formwork panel thereof opposite sides, respectively both arms is on the inside of said lateral connection pipes to the vertical connection pipe Removably fitted Two vertical elbows facing each other so as to constitute each corner portion of the lateral fastening frame, and two vertical elbows penetrating each of the right angle elbows and the vertical connection pipe to which the right angle elbow is fitted. Three through rods, one through rod passing through the through rods, the two right angle elbows and the horizontal connecting pipe into which the right angle elbows are fitted, and attached to the through rods And a fitting length between the right angle elbow and the connection pipe can be adjusted by changing a tightening position of the tightening nut according to a size of the beam formwork. , We propose a horizontal fastening frame for beam formwork units.

Furthermore, the present invention provides a method for constructing a reinforced concrete beam by placing a beam formwork around a reinforcing frame and then placing concrete inside the beam formwork, firstly, on the outer surface of each of the three formwork panels. A formwork panel set with horizontal crosspieces formed by combining a plurality of horizontal crosspieces side by side over the entire length in the longitudinal direction and combining these formwork panels in a groove shape, and the longitudinal direction of the formwork panel set with horizontal crosspieces Assembled in advance a beam form unit comprising a plurality of expansion and contraction type horizontal fastening frames each of which is formed in a U shape, each of which is positioned at a plurality of positions and tightened from both sides to form a beam form frame. by combining the assembled beam form unit as from below to be raised the reinforcing bar frame, have rows arrangement of the beam formwork to the reinforcement frame, the telescopic horizontal clamping frame, wherein the transverse One horizontal connection pipe that is arranged along the bottom formwork panel of the formwork panel set with wood and supports the bottom formwork panel, and the molds on both sides of the formwork panel set with horizontal crosspieces Three connection pipes, two vertical connection pipes arranged along the frame panel and supporting the form panel on both sides thereof, and both arms are inside the vertical connection pipe and the horizontal connection pipe Two right angle elbows that are removably fitted to each other and that face each other so as to form each corner portion of the lateral fastening frame, and the vertical connection in which each of these right angle elbows and the right angle elbow are fitted. Three through rods: two vertical through rods penetrating through the pipe, and one through rod through the two right angle elbows and the horizontal connecting pipe into which the right angle elbows are fitted And attached to their thread And tightening the nut has, in that the one in which can adjust the fitting length between the connection pipe and the right angle elbow by changing the clamping position of the clamping nut according to the size of the beam formwork We propose a construction method for cast-in-place reinforced concrete beams.

In the present invention,
(1) The connection pipe and the right angle elbow of the lateral fastening frame are made of a square pipe or a circular pipe,
(2) A beam width regulating pipe or coil spring interposed between the ends of the right angle elbows facing each other in the connection pipe is inserted into the connection pipe,
(3) The right-angle elbow has a through hole for the vertical bar and the horizontal bar arranged in directions orthogonal to each other at a corner portion thereof.
Is preferred.

(1) With the beam formwork unit according to the present invention, it is possible to quickly build (assemble and fix) the beam formwork, and to perform accurate tightening (perpendicular, vertical / horizontal), and robustly. Can be provided. Further, apart from the rebar frame assembly work on site, it is also possible to precede only the assembly work of the beam formwork in a factory or the like, which contributes to reduction of site work and shortening of the construction period.

(2) According to the lateral fastening frame of the present invention, since it can be easily applied to any of various types of reinforced concrete beams having different thicknesses, it is not necessary to prepare a plurality of types of lateral fastening frames. Therefore, the inventory management of parts is reduced, which is advantageous in terms of cost.

(3) Further, according to the lateral fastening frame of the present invention, the combination of the connection pipe and the right angle elbow forms a U-shape that opens upward, so the fitting portion between the connection pipe and the right angle elbow is not a corner portion. Since it is located in the horizontal part and the vertical part (in the middle of the formwork panel), it is possible to accurately perform the tensioning, particularly right-angle projection, and the construction work of the beam formwork becomes easy and does not require skill.

(4) Further, according to the horizontal fastening frame of the present invention, the connection pipe and the right angle elbow are preferably made of a square pipe, and are detachably fitted. It has excellent shape stability as a beam formwork unit, and can accurately construct reinforced concrete beams.

(5) According to the construction method of the cast-in-place reinforced concrete beam of the present invention, since the separator is not attached to the beam form frame unit, the beam form frame is arranged on the rebar frame with respect to the rebar frame. Since it can be performed only by raising the units and combining them, this operation can be completed in a short time, which is effective in shortening the construction period and advantageous in terms of cost.

It is a partial cross section figure of one Example of the beam formwork unit of this invention. It is a disassembled perspective view which shows one Example of the expansion-contraction type horizontal fastening frame of this invention which the beam-type frame unit of the said Example comprises in a state of lying down. It is a partial cross section figure explaining one Example of the construction method of the reinforced concrete beam of this invention using the beam form unit of the said Example. It is explanatory drawing which shows the method of demolding the reinforced concrete beam after construction from the beam form unit of the said Example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a vertical cross section in the assembled state of the grooved beam formwork unit 1 according to an embodiment of the present invention. The beam formwork unit 1 of this embodiment is for forming a reinforced concrete beam having a rectangular vertical cross section, and is composed of a bottom formwork panel 2a and two formwork panels 2b and 2c. A plurality of horizontal crosspieces 3 made of, for example, butter material are arranged on the outer surface of each of the formwork panels along the longitudinal direction of the formwork panels 2a to 2c, and are fixed to the formwork panels 2a to 2c by nailing. Then, form panels 4a to 4c with horizontal crosspieces are formed, and spiral reinforcing bars (hoop bars) are welded to the formwork panels 4a to 4c with horizontal crosspieces around a plurality of main reinforcing bars which are main parts of the reinforced concrete beam. A frame panel set 4 with a horizontal crosspiece is provided so as to surround a reinforcing bar frame (not shown) having a rectangular cross section constructed as described above.

  Further, the beam formwork unit 1 of this embodiment is positioned from the both sides of the outer side and the lower side of the formwork panel set 4 with horizontal crosspieces assembled in the above groove shape and tightened from both sides. A plurality of telescopic horizontal fastening frames 5 each having a U-shape, each of which opens upward, form a groove-shaped beam form frame.

  That is, the feature of the beam formwork unit 1 of this embodiment is that the formwork panel set 4 with a horizontal crosspiece is effectively prevented from bulging of the formwork panel set 4 with a horizontal crosspiece due to the internal pressure at the time of placing concrete. The horizontal fastening frame 5 is disposed at a plurality of locations in the longitudinal direction of the horizontal fastening frame at predetermined intervals and surrounds the outer side of the formwork panel set 4 with horizontal crosspieces from both sides and three sides below. It is in.

  This horizontal clamping frame 5 is used to combine the three form panels 4a to 4c with horizontal crosspieces of the formwork panel set 4 with horizontal crosspieces into a groove shape, and maintain the state of FIG. As shown in the exploded perspective view, one horizontal connection pipe 6a arranged along the bottom formwork panel 4a with the horizontal crosspiece in the formwork panel set 4 with the horizontal crosspiece, and the formwork panel set 4 with the horizontal crosspiece 3 connecting pipes 6 and 2 vertical connecting pipes 6b respectively disposed along the form panels 4b and 4c with horizontal crosspieces on both sides, and both arm portions of the vertical connecting pipe 6b and the horizontal connecting pipe 6b. As shown in FIG. 1, two L-shaped corner members or right-angle elbows 7, which are detachably fitted to the connection pipe 6 a and are opposed to each other so as to constitute the respective corner portions of the lateral fastening frame 5, are shown in FIG. 1. A frame with a U-shape that opens upward It is intended to shape the.

The horizontal fastening frame 5 adjusts the fitting depth of the right angle elbow 7 to be inserted into each connection pipe 6, that is, the fitting length between the horizontal connection pipe 6 a and the vertical connection pipe 6 b and each arm portion of the right angle elbow 7. By doing so, although the length of one side is accompanied by a change in the size of the formwork panels 2a to 2c, it can be made to freely correspond to the thickness of the reinforced concrete beam to be constructed, for example, 600 × 800 mm, 750 × 1000 mm, It can be used for any beam of 900 × 1200 mm or the like. Therefore, if at least one kind of connecting pipe 6 and right angle elbow 7 is prepared, it is possible to cope with the construction of most reinforced concrete beams, and for thicker beams, the connecting pipe 6 is longer. It is enough to replace it with something. Therefore, according to the lateral tightening frame 5, the number of parts can be reduced, so that inventory management becomes easy.

  In the beam form frame unit 1 of the present embodiment, in the lateral fastening frame 5, a pair of right angle elbows 7 constituting each corner portion and one arm portion of the right angle elbow 7 positioned between the right angle elbows 7. Further, a horizontal through-rod 8a that linearly penetrates the right-angle elbow 7 and the horizontal connection pipe 6a is inserted into the horizontal connection pipe 6a that is detachably inserted into the horizontal connection pipe 6a, and a pair of right angles that constitute each corner portion. The elbow 7 and the two vertical connection pipes 6b that are removably inserted into the other arm portions of the right angle elbows 7 also respectively penetrate the right angle elbow 7 and the vertical connection pipe 6b linearly. The vertical threading rods 8b and 8c are inserted and inserted at a twisted position in a direction orthogonal to the horizontal threading rod 8a, and the three threading rods 8 of the horizontal threading rod 8a and the two vertical threading rods 8b and 8c Right angle elbow 7 and connecting pipe Here, as shown in FIG. 1, the upper end portions of the vertical through rods 8b and 8c are fixed in advance to the upper end portion of the vertical connection pipe 6b via a bracket 8d. Thus, the lower end portions of the vertical through rods 8b and 8c protrude from the lower end portion of the vertical connection pipe 6b.

  The arm portion of the right-angle elbow 7 and the connection pipe 6 can be connected to each other to be expanded and contracted. Further, the through-rod 8 is inserted between the arm portion of the right-angle elbow 7 and the connection pipe 6. As a result, the connection state becomes more stable, and the right-angle elbow 7 is tightened with the tightening nut 10 screwed to the end portion of the through-rod 8 via the washer 9 to thereby form the three form panels with the crosspieces. The assembled state of the grooves 4a to 4c can be maintained.

  Furthermore, in the beam formwork unit 1 of the present embodiment, a pipe 11 made of, for example, vinyl chloride or a steel coil spring for regulating the beam thickness is provided at the center portion of the transverse rod 8a and the upper end portion of the longitudinal rod 8b. 12 is inserted (the pipe 11 is shown in FIGS. 1, 3 and 4), and the pipe 11 or the coil spring 12 is positioned between the ends of the arms of the right angle elbow 7 facing each other in the lateral connection pipe 6 a. In the vertical connection pipe 6b, the width and the height of the beam form frame are regulated by being positioned between the bracket 8d and the tip of the arm of the right angle elbow 7. Accordingly, the length of the pipe 11 or the coil spring 12 corresponds to the thickness (width and height) of the reinforced concrete beam to be constructed. However, the pipe 11 and the coil spring 12 are not essential to the present invention. For example, instead of providing them, the fastening nut 10 is tightened at the end of each through-rod 8 according to the thickness of the reinforced concrete beam to be constructed. A mark indicating the insertion position may be provided, and the clamping nut 10 may be tightened to the position of the mark when the beam formwork unit 1 is assembled.

  Further, in the beam formwork unit 1 of the present embodiment, the connection pipe 6 and the right angle elbow 7 are formed of a rectangular pipe, but the present invention is not limited thereto, and may be formed of a cylindrical pipe. . The right angle elbow 7 may be a solid material of light metal such as an aluminum alloy instead of a pipe. However, the right angle elbow 7 is for maintaining each corner portion of the lateral fastening frame 5 at a right angle, and therefore must have a bend angle of exactly 90 °. For this reason, the lateral fastening frame 5 of the present embodiment can always form a U-shaped frame having a corner portion of 90 ° accurately.

  In addition, as shown in FIG. 2, a pair of through holes 7a for inserting the horizontal threading rod 8a and the longitudinal threading rods 8b and 8c in a twisted position in directions orthogonal to each other are provided at the corners of each right-angle elbow 7. , 7b are provided. As shown in FIG. 1, a U-shape is assembled by screwing and tightening a tightening nut 10 to the threaded ends of the horizontal through rod 8a and the vertical through rod 8b, 8c protruding from the through holes 7a, 7b. The final assembled form of the horizontal fastening frame 5 can be maintained and fixed, and as a result, the final assembled form of the formwork panel assembly 4 with horizontal crosspieces assembled into a groove shape can be maintained and fixed.

  Next, the assembly procedure of the beam formwork unit 1 of the present embodiment will be described. First, as a preparatory step, a plurality of horizontal crosspieces 3 are arranged side by side, and three formwork panels on the horizontal crosspieces 3 are a bottom formwork panel 2a and both side formwork panels 2b and 2c. 2 are mounted and screwed, and the screwing portion is caulked to form three horizontal crosspieces: a bottom formwork panel 4a and a side crosspiece formwork panel 4b, 4c on both sides. A formwork panel set 4 with horizontal crosspieces composed of the attached formwork panels 4a to 4c is formed. It is to be noted that the frictional force between the horizontal crosspiece 3 and the square pipe 13 and the plurality of horizontal connection pipes 6a and between the horizontal crosspiece 3 and the plurality of vertical connection pipes 6b and 6c is tightened by the tightening nut 10. Since it is fixed by, it does not need to be fixed with a fixing bracket.

  Next, as a processing / ground assembly process, a plurality of horizontal connection pipes 6a are arranged side by side at substantially equal intervals in a direction orthogonal to the longitudinal direction of the beam form unit 1, and the plurality of horizontal connections are arranged. The pipe 11 or the coil spring 12 is disposed inside each of the pipes 6a, and one arm portion of the two right-angle elbows 7 extending horizontally is provided at each end of each of the plurality of lateral connection pipes 6a. The other arm portions of the right-angle elbows 7 standing vertically are connected together with the pipe 11 or the coil spring 12 to the lower end portions of the plurality of vertical connection pipes 6b and 6c. The U-shaped horizontal fastening frame 5 that is opened upward is assembled by inserting and detachably connecting to the frame. During this assembling operation, the pipe 11 or the coil spring 12 has one end of the horizontally extending arm portion of the two right angle elbows 7 and the end of the vertically standing arm portion of the two right angle elbows 7. It is preferable to temporarily fix each of them for smooth assembly work. In addition, the upper end portions of the vertical through rods 8b and 8c inserted into the vertical connection pipes 6b and 6c are fixed in advance in the upper end portions of the vertical connection pipes 6b and 6c via brackets 8d. Thus, since the lower end portions of the vertical through rods 8b and 8c protrude from the lower end portions of the vertical connection pipes 6b and 6c, the vertical through rods 8b and 8c are formed as shown in FIG. It is inserted into the other arm portion standing vertically, and its lower end portion is projected from the through hole 7 b of the right angle elbow 7.

  Next, in this process, the form panels 4b, 4c with horizontal crosspieces on both sides are set up with their long sides down so that the formwork panels 2b, 2c on both sides face each other inward and the horizontal crosspiece 3 is outside. In this state, it is placed on the horizontal connection pipes 6a arranged side by side and leans against the vertical connection pipes 6b and 6c from the inside thereof, and preferably the center of the multiple horizontal connection pipes 6a. As shown in FIG. 1 and FIG. 2, a reinforcing square pipe 13 having the same height as that of the horizontal pier 3 is placed and placed on the part, and then the form panel 4 a with the horizontal pier at the bottom is placed horizontally. With the pier 3 protruding downward, the pierce 3 is fitted between the form panels 4b, 4c with horizontal piers on both sides and placed on the horizontal connection pipes 6a arranged side by side. In this way, the three form panels 4a, 4b, 4c with horizontal crosspieces are assembled into a groove shape in which each corner portion forms a right angle.

  Thereafter, in this step, the right angle elbow 7 and the lateral connection pipe 6a assembled in a U-shape are laterally passed through the pipe 11 or the coil spring 12 in the lateral connection pipe 6a through the through hole 7a. The rod 8a is inserted, and both ends of the transverse rod 8a and the lower ends of the longitudinal rods 8b and 8c are tightened by screwing a tightening nut 10 through washers 9 to assemble the beam formwork unit 1. Complete.

  The assembled beam formwork unit 1 has, for example, 4 to 5 having connecting pipes 6 made of 90 mm square pipes at intervals of 450 to 1200 mm with respect to the length of the beam 4540 mm in the longitudinal direction of the formwork panel set 4 with a horizontal crosspiece. The horizontal fastening frames 5 are arranged to position the form panels 4a and 4c with horizontal crosspieces at the bottom and the side panels 4b and 4c with horizontal crosspieces at the bottom and form panels 4b and 4c with horizontal crosspieces on both sides. Is tightened. Here, for example, when the length of one side of the form panel 4a with horizontal crosspieces is 600 to 900 mm, the length of the horizontal connection pipe 6a is about 800 mm, and the formwork panels 4b and 4c with horizontal crosspieces on both sides are provided. When the length of one side is 900 to 1300 mm, the length of the vertical connection pipes 6 b and 6 c is about 900 mm, the length of the arm portion of the right angle elbow 7 is about 800 mm in length including the corner portion, and about 500 mm in width, The fitting length between each arm portion of the right-angle elbow 7 and the connection pipe 6 is preferably about 2/3 or more of the length of each arm portion of the right-angle elbow 7 in view of the strength of the lateral fastening frame 5.

  Next, the construction method of the cast-in-place reinforced concrete beam with a floor slab of one Example of this invention is demonstrated. At the construction site, first, a rectangular beam-shaped reinforcing bar frame is constructed by welding and fixing hoop bars around a plurality of main bars (rebars) that are placed between columns so as to form a horizontal rectangular parallelepiped. Separately from this, the beam formwork unit 1 of the above-described embodiment is assembled at the factory or assembled at the site.

Then, the assembled beam form frame unit 1 is lifted by a crane, a forklift, or the like, and is raised and fitted to the rebar frame from below, and then, for example, as shown in FIG. Beam corners are constructed by supporting the corners of each right-angle elbow 7 from below with a normal telescopic support 15 (rebar frames are not shown), and preferably the vertical connection pipes of the horizontal fastening frames 5 For example, a rectangular thick plate-like auxiliary material 14 made of butter material is fitted and set to the upper end portions of 6b and 6c, and then a normal floor slab formwork panel 16 is constructed and used for the floor slab. The formwork panel 16 is connected to each auxiliary material 14 by nailing or the like. The floor slab formwork panel 16 may be reinforced by assembling a horizontal sill (not shown) at the site. However, the floor slab formwork panel 16 may be pre-assembled at the factory and transported to the site as a unit. You may arrange in.

Thereafter, as shown in FIG. 3, concrete C is placed in the beam formwork unit 1 and on the floor slab formwork panel 16 . When placing the concrete C, according to the construction method of this embodiment, the upper ends of the longitudinal connection pipes 6b, 6c of each lateral fastening frame 5 are placed on the floor slab form panel 16 via the auxiliary material 14. Since they are connected and positioned, the opening between the upper ends of the vertical connection pipes 6b and 6c of each horizontal fastening frame 5 due to the pressure of the concrete C can be more reliably prevented.

And by pouring concrete C is hardened, when reinforced concrete beams BM with the floor slab is formed, as shown in FIG. 4, first, when reducing the支保Engineering 15, lateral桟木with formwork panels 4a of the bottom, As shown by the arrow A in the figure, when pressed by the pressure of the concrete C, it leaves the surface of the concrete C, the entire beam form unit 1 is lowered by its own weight, and the auxiliary member 14 is connected to the vertical connection pipe of each horizontal fastening frame 5. When the fastening nuts 10 attached to both ends of the horizontal threading bar 8a of each lateral fastening frame 5 are loosened and then loosened, the form panels 4b, 4c with horizontal crosspieces on both sides become concrete. pressed at a pressure of C away from the surface of the concrete C as shown by arrow B, by then further and further down the entire beam form unit 1 shortens the支保Engineering 15, iron The concrete beam BM easily can be released from the beam form unit 1.

  Therefore, according to the construction method of the cast-in-place reinforced concrete beam of this embodiment, it is very easy to dispose the beam-type frame unit 1 to the rebar frame, and at least the disposition of the separator 4 is not required, and the construction time is significantly reduced. There is.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described examples, and can be appropriately changed within the scope of the claims. For example, the crosspiece 3 and the square pipe 13 The number, arrangement, and presence / absence of fixing to the formwork panels 2a to 2c and the connection pipe 6 may be changed as necessary. For example, when the connection pipe 6 and the right angle elbow 7 are made of round pipes, The vertical connection pipes 6b and 6c are normally fixed to the horizontal frame 3 of the horizontal panels 3b and 4c on both sides so that the elbow 7 does not rotate in the horizontal connection pipe 6a and the vertical connection pipes 6b and 6c fall down. The square pipe 13 may be fixed to the formwork panel 4a with a horizontal crosspiece with a normal fixing metal so that the square pipe 13 is not displaced on the horizontal connection pipe 6a.

  Thus, according to the beam formwork unit of the present invention, the beam formwork can be quickly built (assembled and fixed), and it can be accurately tightened (perpendicular, vertical and horizontal), and has a solid beam shape. A frame can be provided. Further, apart from the rebar frame assembly work on site, it is also possible to precede only the assembly work of the beam formwork in a factory or the like, which contributes to reduction of site work and shortening of the construction period.

  Further, according to the lateral fastening frame of the present invention, since it can be easily applied to any of various types of reinforced concrete beams having different thicknesses, it is not necessary to prepare a plurality of types of lateral fastening frames. Since it is sufficient to prepare, parts inventory management is reduced, which is advantageous in terms of cost.

  Furthermore, according to the horizontal fastening frame of the present invention, since the connection pipe and the right angle elbow are combined to form an upward U shape, the fitting portion between the connection pipe and the right angle elbow is not a corner portion but a horizontal portion and a vertical portion. Since it is located at the center (in the middle of the formwork panel), it is possible to make a tight stretch, especially right angle, and the construction work of the beam formwork becomes easy and does not require skill.

And according to the construction method of the cast-in-place reinforced concrete beam of the present invention, since the separator is not attached to the beam form unit, the beam form unit is raised relative to the rebar frame. since performed only combined by, it is possible to complete this task in a short time, it is also advantageous in terms of cost with the effect in shortening the work period.

  The present invention is a technique applied to a beam form frame unit and a horizontal fastening frame effective in the construction of a rectangular reinforced concrete beam such as a building, but can naturally be applied to construction of a civil engineering structure or the like. .

DESCRIPTION OF SYMBOLS 1 Beam formwork unit 2a Formwork panel of bottom part 2b, 2c Formwork panel of side part 3 Horizontal crosspiece 4 Formwork panel set with horizontal crosspiece 4a Formwork panel with horizontal crosspiece of bottom part 4b, 4c Type with horizontal crosspiece of side part Frame panel 5 Horizontal fastening frame 6 Connection pipe 6a Horizontal connection pipe 6b, 6c Vertical connection pipe 6d Bracket 7 Right angle elbow 8 Through rod 8a Horizontal through rod 8b, 8c Vertical through rod 9 Washer 10 Nut 11 Pipe 12 Coil spring 13 Square pipe 14 Auxiliary material 15 Supporting work 16 Form panel for floor slab BM Reinforced concrete beam

Claims (9)

In the beam formwork unit used to construct reinforced concrete beams,
A formwork panel set with a horizontal crosspiece, which is configured by fixing a plurality of horizontal crosspieces side by side over the entire length in the longitudinal direction of each of the three formwork panels, and combining the formwork panels in a groove shape. ,
A plurality of telescopic horizontal fastening frames each of which is formed in a U-shape, each of which has an upwardly open U-shape, is formed by positioning a plurality of longitudinal positions of the form panel set with horizontal crosspieces and tightening from both sides to form a beam formwork. Yeah,
The lateral clamping frame, one and the horizontal connection pipe you support the formwork panels of the bottom portion is disposed along the formwork panel of the bottom of the transverse桟木with formwork panel assembly, typed the transverse桟木and three connection pipes between the two vertical connection pipes you supporting formwork panel thereof opposite sides are arranged along the form panels on both sides of the frame panel assembly, both arms is the longitudinal Two right angle elbows which are removably fitted inside the connection pipe and the lateral connection pipe, respectively, and are opposed to each other so as to constitute each corner portion of the horizontal fastening frame, and each of the right angle elbows and Two longitudinal bars passing through the vertical connection pipe fitted with the right angle elbow, and one piece passing through the two right angle elbows and the horizontal connection pipe fitted with the right angle elbow. Three through bars with a horizontal bar, and A fitting nut between the right angle elbow and the connection pipe by changing the fastening position of the fastening nut according to the size of the beam formwork. Beam formwork unit characterized by being adjustable.   The beam formwork unit according to claim 1, wherein the connection pipe and the right angle elbow of the lateral fastening frame are formed of a square pipe or a circular pipe. 2. A beam width regulating pipe or a coil spring interposed between the ends of the arm portions of the right angle elbow facing each other in the connection pipe is fitted in the connection pipe. The beam formwork unit described.   2. The beam formwork unit according to claim 1, wherein the right-angle elbow has a through hole for the vertical through bar and the horizontal through bar arranged in a direction orthogonal to each other at a corner portion thereof. A formwork panel assembly with a horizontal crosspiece constructed by fixing a plurality of horizontal crosspieces side by side over the entire length in the longitudinal direction of each of the three formwork panels and combining the formwork panels in a groove shape. In the stretchable horizontal fastening frame that forms a U-shape that opens upward, positioning each of a plurality of longitudinal positions and tightening from both sides to form a beam form frame,
One and horizontal connecting pipes you support the formwork panels of the bottom portion is disposed along the formwork panel of the bottom of the transverse桟木with formwork panel assembly, both sides of the transverse桟木with formwork panel sets and three connection pipes between the two vertical connection pipes you supporting formwork panel thereof opposite sides are arranged along the formwork panel parts,
Two right-hand elbows whose both arms are detachably fitted to the inside of the vertical connection pipe and the horizontal connection pipe, respectively, and that face each other so as to constitute each corner portion of the horizontal fastening frame;
The two vertical bar passing through each of the right angle elbows and the vertical connection pipe fitted with the right angle elbows, and the horizontal connection where the two right angle elbows and the right angle elbows are fitted Three through-rods with one horizontal through-hole penetrating the pipe;
A clamping nut attached to the through-rods,
A transverse fastening frame for a beam form unit, wherein a fitting length between the right angle elbow and the connection pipe can be adjusted by changing a fastening position of the fastening nut according to a size of the beam form frame. .   6. The horizontal clamping frame for a beam form frame unit according to claim 5, wherein the connection pipe and the right angle elbow of the horizontal clamping frame are formed of a square pipe or a circular pipe. 6. A beam width regulating pipe or a coil spring interposed between the ends of the arm portions of the right angle elbow facing each other in the connection pipe is fitted into the connection pipe. Horizontal fastening frame for beam formwork unit as described.   6. The transverse fastening for beam formwork unit according to claim 5, wherein the right-angle elbow has a through hole for the vertical through bar and the horizontal through bar arranged in a direction orthogonal to each other at a corner portion thereof. frame. In a method of constructing a reinforced concrete beam by placing a beam formwork around the rebar frame and then placing concrete inside it
First, a formwork panel with a horizontal crosspiece formed by fixing a plurality of horizontal crosspieces side by side over the entire length in the longitudinal direction of each of the three formwork panels and combining the formwork panels into a groove shape. A plurality of telescopic horizontal fastening frames each of which is formed in a U-shape, each of which is open upward, positioning a plurality of longitudinal direction portions of the form panel set with horizontal crosspieces and tightening from both sides to form a beam form; , Pre-assembled beam formwork unit comprising
By combining the lower to the reinforcing bar frame as it is raised the the assembled beam-type frame unit, have rows arrangement of the beam formwork to the reinforcement frame,
The telescopic horizontal fastening frame is
One horizontal connection pipe arranged along the bottom formwork panel of the formwork panel set with horizontal crosspieces to support the bottom formwork panel, and both sides of the formwork panel set with horizontal crosspieces Three connection pipes with two vertical connection pipes arranged along the form panel and supporting the form panels on both sides thereof,
Two right-hand elbows whose both arms are detachably fitted to the inside of the vertical connection pipe and the horizontal connection pipe, respectively, and that face each other so as to constitute each corner portion of the horizontal fastening frame;
The two vertical bar passing through each of the right angle elbows and the vertical connection pipe fitted with the right angle elbows, and the horizontal connection where the two right angle elbows and the right angle elbows are fitted Three threading rods, one threading rod penetrating the pipe,
A clamping nut attached to the through-rods,
Characterized in that by changing the clamping position of the clamping nut are those capable of adjusting the fitting length between the connection pipe and the right angle elbow in accordance with the size of the beam-type frame, cast in place reinforced concrete beams Construction method.

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