JP7353061B2 - How to fix joint formwork and temporary support equipment - Google Patents

Description

The present disclosure relates to a method for fixing a joint form used when providing a joint between precast concrete members, and a temporary support device that temporarily supports the joint form.

When constructing a column using precast concrete members, a joint material such as grout is poured to form a joint between the previously installed precast concrete member and the precast concrete member installed thereon. For example, Patent Document 1 describes a joint form for forming a joint between a floor surface and a precast concrete column member, and a bolt inserted through the joint form is installed in the precast concrete column member. The joint form is fixed by fastening it to the inserted insert. Further, Patent Document 2 illustrates a state in which joint forms for forming joints between precast concrete column members arranged one above the other are fixed to both precast concrete column members with bolts.

Japanese Patent Application Publication No. 2018-91018 Japanese Patent Application Publication No. 2006-200197

The joint formwork described in Patent Documents 1 and 2 requires inserts for fastening bolts to the precast concrete member to be provided in advance, and post-processing to close the inserts is required after removal of the joint formwork. Met. In addition, when joining precast concrete members at the middle part of a column like the joint formwork described in Patent Document 2, in order to attach the joint formwork to the precast concrete member, a worker who supports the joint formwork and a support Two workers were required, one to tighten the bolts and the other to secure the joint formwork.

In view of such problems, an object of the present invention is to provide a method for fixing joint forms for forming joints between precast concrete members, which can be carried out by one worker. At least some embodiments of the present invention further aim to provide a method of fixing a joint form to a precast concrete member that does not require inserts, post-processing, etc. . It is an object of at least some embodiments of the present invention to provide a temporary support device that temporarily supports a joint form that can be used in the method for fixing a joint form described above.

At least some embodiments of the present invention provide a method for fixing a joint form (5) for forming a joint (4) at a joint between a plurality of precast concrete members, the first precast concrete member ( 1) arranging a second precast concrete member (2) on the upper surface with a gap corresponding to the joint, and locking a temporary support device (9) to one of the first and second precast concrete members. and temporarily supporting the joint form by placing the joint form on the temporary support device; fixing the joint form to the first and second precast concrete members; removing the temporary support device from the one, the one receiving a main reinforcement (1b) communicating with the gap and protruding from the other concrete portion (1a) of the first and second precast concrete members. and a horizontal hole (7, 8) extending from the sleeve to a side surface of the one concrete part, and the temporary receiving device is inserted into the horizontal hole and locked. (15), a placing part (16) on which the joint form is placed, and a connecting part (17) that connects the locking part and the placing part.

According to this configuration, by temporarily supporting the frame body on the temporary support device, one worker can fix the joint formwork to the first and second precast concrete members. Moreover, since the temporary support device is locked to the precast concrete member using the horizontal hole required for the joint of the main reinforcement, there is no need to provide a new hole to lock the temporary support device.

In the method according to at least some embodiments of the present invention, in the above configuration, the joint formwork includes a plurality of joint forms extending along an upper edge of the first precast concrete member and a lower edge of the second precast concrete member. (12), the temporarily supporting step includes placing each of the elongated materials on the temporary support device, and the fixing step includes mutually disposing the plurality of elongated materials. A frame body (10) surrounding the upper end of the first precast concrete member and the lower end of the second precast concrete member is formed by connecting the ends of increasing the pressure between the frame and the upper end side surface of the first precast concrete member and the lower end side surface of the second precast concrete member by tightening the ends of the elongated material; It is characterized by including.

According to this configuration, after the joint form is temporarily supported by the temporary support device, it is fixed to the upper end side surface of the first precast concrete member and the lower end side surface of the second precast concrete member by frictional force. Therefore, the joint form can be fixed without providing inserts in the first and second precast concrete members.

In the method according to at least some embodiments of the present invention, in the above structure, the joint form includes a flexible tube body (11) attached to the inside of the frame body to seal the gap. and the fixing step includes pressurizing fluid into the tube body.

According to this configuration, due to the flexibility of the tube body, errors in manufacturing and construction of the first and second precast concrete members can be absorbed, and leakage of the joint material can be prevented.

At least some embodiments of the invention form a joint (4) between a first precast concrete member (1) and a second precast concrete member (2) disposed above said first precast concrete member. A temporary support device (9) that temporarily supports a joint form (5) for use in the concrete and is removed after fixing the joint form and before pouring joint material , A locking portion that is inserted into a horizontal hole (7) extending from a sleeve communicating with a gap corresponding to the joint to a side surface of the concrete portion (2a) on one side and is locked so as to be movable in the insertion direction. (15), a placing part (16) on which the joint form is placed, and a connecting part (17) that connects the locking part and the placing part.

According to this configuration, since the joint form can be temporarily supported by the temporary support device, one worker can fix the joint form to the first and second precast concrete members.

The temporary receiving device according to at least some embodiments of the present invention is characterized in that, in the above configuration, the mounting portion is arranged on the same side as and parallel to the locking portion with respect to the connecting portion. .

According to this configuration, since the placing part is arranged parallel to and on the same side as the locking part with respect to the connecting part, after fixing the joint form, By moving the temporary support device in a direction away from the first and second precast concrete members, the temporary support device can be easily removed.

In the temporary receiving device according to at least some embodiments of the present invention, in the above configuration, the connecting portion and the mounting portion are formed of a steel plate bent to have an L-shape in a side view, and the The stop part is formed of a pipe that fits into the horizontal hole, and is attached to the steel plate.

According to this configuration, the temporary receiving device can be manufactured using materials that are relatively easily available on the market.

According to the present invention, it is possible to provide a method for fixing a joint form used when providing joints between precast concrete members, and a temporary support device, which can be carried out by one worker.

A vertical cross-sectional view of a precast concrete member to which a joint form according to an embodiment is fixed. Cross-sectional view taken along line II-II in Figure 1 An enlarged vertical sectional view of a precast concrete member and a temporary support device to which a joint form according to an embodiment is fixed. Diagrams showing the temporary receiving device according to the embodiment (A: AA sectional view in diagram B, B: rear view) A diagram showing a first modification of the joint form according to the embodiment (an enlarged sectional view in a cross section corresponding to FIG. 2) An enlarged vertical sectional view of a precast concrete member and a temporary support device to which a joint form is fixed according to a second modification of the embodiment. Diagrams showing a seat according to a second modification of the embodiment (A: side view, B: front view) An enlarged plan view of a corner of a joint form according to a second modification of the embodiment

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a column 3 including a first precast concrete member 1 (hereinafter, "precast concrete" will be referred to as "PCa") and a second PCa member 2 disposed above the first PCa member 1. It is. FIG. 2 is a cross-sectional view taken along line II-II in FIG. As shown in FIG. 1, a joint 4 is formed between the first PCa member 1 and the second PCa member 2. The joint 4 is formed by injecting a joint material such as grout into the gap between the first PCa member 1 and the second PCa member 2. At this time, as shown in FIG. 2, the joint form 5 is installed so as to be in contact with the side surface of the upper end of the first PCa member 1 and the side surface of the lower end of the second PCa member 2 to create the joint 4. The gap is sealed (the space between the upper edge of the first PCa member 1 and the lower edge of the second PCa member 2 in the gap is sealed).

As shown in FIG. 1, the first PCa member 1 includes a concrete portion 1a, a main reinforcement 1b whose intermediate portion is buried in the concrete portion 1a, and a tie reinforcement (not shown) buried in the concrete portion 1a. The second PCa member 2 includes a concrete portion 2a, a main reinforcement 2b whose intermediate portion is buried in the concrete portion 2a, and a tie reinforcement (not shown) buried in the concrete portion 2a. The second PCa member 2 includes a sleeve 6 that opens on the lower surface, a grout injection hole 7 that is a horizontal hole that extends from the bottom of the sleeve 6 to the side surface of the concrete portion 2a, and a horizontal hole that extends from the top of the sleeve 6 to the side surface of the concrete portion 2a. It has an air exhaust hole 8.

The upper end portion of the main reinforcement 1b of the first PCa member 1 protrudes from the upper surface of the concrete portion 1a and is received in the sleeve 6. The lower end portion of the main reinforcement 2b of the second PCa member 2 is received in the sleeve 6. To fill the sleeve 6 with grout (not shown), the grout is injected through the grout injection hole 7 and continues until it is expelled through the air exhaust hole 8. By filling the sleeve 6 with grout, both the main reinforcements 1b and 2b are joined to each other.

FIG. 2 shows a state in which the joint form 5 is fixed to the first and second PCa members 1 and 2 so that joint material can be injected into the gap, and FIG. 3 shows a state after fixing but before removing the temporary support device 9. shows. FIG. 4 shows the temporary receiving device 9. As shown in FIGS. 2 to 4, the joint form 5 includes a frame 10 and a tube body 11 attached to the frame 10 to seal a gap into which a joint material is injected.

The frame 10 extends along the upper edge of the first PCa member 1 and the lower edge of the second PCa member 2. In this embodiment, since the pillar 3 is rectangular in plan view, the frame 10 is also rectangular. The frame body 10 is formed by connecting the ends of four elongated members 12 to each other. For example, a square steel pipe can be used as the main body 12a of the long material 12. At the end of each elongated member 12, a plate-shaped connecting piece 12b is provided that projects obliquely outward with respect to the extending direction of the main body 12a. The connecting pieces 12b of the elongated members 12 that are tightly connected to each other protrude from the main body 12a at angles such that their surfaces face each other. One of the connecting pieces 12b of the long materials 12 to be tightly connected to each other is provided with a screw hole, and the other is provided with a through hole, and by fastening the screw 18 inserted into the through hole to the screw hole, the long material 12 can be connected tightly. The ends of the material 12 are fastened together. By tightening the ends of the elongated members 12 to each other, the outline of the frame 10 is reduced so that the distance between the two elongated members 12 that are parallel to each other is reduced.

The tube body 11 may be formed by attaching one bent tube body 11 along two to four elongated members 12; It is preferable to attach the four tube bodies 11 one by one along the corresponding one elongated member 12 so that the fluid can be press-fitted into the interior simultaneously and evenly. By simultaneously press-fitting the fluid into the respective parts of the tube body 11 provided along the four sides of the frame body 10, the fluid is evenly press-fitted in all directions around the gap where the joint 4 is to be formed. Errors in manufacturing and construction of precast concrete parts can be evenly absorbed. If the tube body 11 has an excess length, it may be bent at the corner of the frame body 10 and the excess portion may be placed outside the frame body 10. Therefore, even in parts where the pillars 3 have different thicknesses, the tube body 11 can be used without being replaced. In addition, if the tube body 11 is added in the middle of one long material 12, there is a risk that the joined part will succumb to the injection pressure of the joint material and the joint material will leak. If the length of the tube body 11 is selected in this way, even if the tube body 11 is used as a joint form 5 of a different size, there is no need to add parts, and the entire length of one long material 12 can be extended. One continuous tube body 11 can be used, and leakage of the joint material can be prevented. For example, the thickness of the pillars 3 may differ between the lower and upper floors of a building, but even in such a case, the tube body 11 can be reused. The tube body 11 may be fixed to the elongated member 12 by pasting or the like.

The tube body 11 has flexibility and can pressurize fluid such as air or water into the tube body 11 . The surface of the tube body 11 that seals the gap preferably extends linearly along the upper edge of the first PCa member 1 and the lower edge of the second PCa member 2 so that the surface of the joint 4 is smooth. For example, as the material for the tube body 11, textiles, rubber, or a composite material of textiles and rubber can be used. The fluid is forced from the compressor 13 through a branching device 14 into a tube body 11 disposed along each length 12 . Since the fluid is injected into the excess bent end, the press-fitting of the fluid has the effect of filling the gap to a certain extent at the corner of the joint form 5.

When the designed width of the joint 4 is 20 to 25 mm, it is preferable to configure the joint form 5 so as to allow the actual joint width to be 15 to 30 mm due to manufacturing and construction errors. For example, such manufacturing/construction errors can be tolerated by constructing the long material 12 from a 50×50×2.3 square steel tube and by setting the diameter of the tube body 11 to about 40 mm.

The temporary receiving device 9 connects a locking portion 15 that is inserted into the grout injection hole 7 and locked, a placement portion 16 on which the joint form 5 is placed, and the locking portion 15 and the placement portion 16. A connecting portion 17 is included. After fixing the joint form 5, the mounting part 16 is arranged parallel to and on the same side as the locking part 15 with respect to the connecting part 17 so that the temporary support device 9 can be easily removed. For example, the placing part 16 and the connecting part 17 are made of a steel plate bent to have an L-shape when viewed from the side, and the locking part 15 is made of a circular steel pipe and welded to the steel plate. By configuring the temporary receiving device 9 in this way, the temporary receiving device 9 can be made of materials that are relatively easily available on the market. Moreover, since the grout injection hole 7 is generally a circular hole in many cases, by making the locking part 15 a circular steel pipe, the locking part 15 can be easily locked in the grout injection hole 7. Further, the outer diameter of the circular steel pipe constituting the locking part 15 is made equal to or slightly smaller than the inner diameter of the grout injection hole 7, and the locking part 15 is fitted into the grout injection hole 7 tightly or loosely. It is preferable. Note that instead of the grout injection hole 7, a locking portion 15 may be inserted and locked into the air discharge hole 8. The distance between the locking part 15 and the mounting part 16 of the temporary receiving device 9 is such that the elongated material 12 is located at the same height as the upper edge of the first PCa member 1 and the lower edge of the second PCa member 2, or Or it is set to a slightly lower position. Generally, the distance from the bottom surface to the grout injection hole 7 in the second PCa member 2 and the second PCa member 2 installed in another part is the same, so the temporary receiving device 9 is suitable for construction in other parts. Can be repurposed.

Next, a method of fixing and using the joint form 5 using the temporary support device 9 will be explained.

First, the second PCa member 2 is placed on the upper surface of the first PCa member 1 with a gap corresponding to the joint 4 therebetween.

Next, the locking part 15 of the temporary receiving device 9 is inserted and locked into the grout injection hole 7 of the second PCa member 2, and the elongated material 12 is placed on the mounting part 16. 12 is temporarily supported by the temporary support device 9.

Next, the ends of the elongated materials 12 are connected to each other to form the frame 10. At this time, the frame 10 is arranged so as to surround the upper end edge of the first PCa member 1 and the lower end edge of the second PCa member 2. By pressurizing fluid into the tube body 11, the tube body 11 is brought into close contact with the upper end side surface of the first PCa member 1, the lower end side surface of the second PCa member 2, and the frame body 10, and the height of the joint form 5 is adjusted. adjust. Thereafter, the ends of the plurality of elongated members 12 are tied together so that the outline of the frame 10 becomes small, and the frame 10, the upper end side surface of the first PCa member 1, and the lower end side surface of the second PCa member 2. Increase the pressure between. Since the frictional force increases as the pressure increases, the joint form 5 can be fixed to the first PCa member 1 and the second PCa member 2 by this frictional force.

Next, the temporary support device 9 is removed and a joint material is injected into the gap. After curing the joint material, the joint form 5 is removed.

By using the temporary support device 9, the worker alone can lock the temporary support device 9 to the second PCa member 2, place the joint form 5 on the temporary support device 9, and then set the joint form. The frame 5 can be fixed to the first PCa member 1 and the second PCa member 2. Since the joint formwork 5 is fixed to the first PCa member 1 and the second PCa member 2 by frictional force after being temporarily supported by the temporary support device 9, there is no need to provide inserts or the like in the first PCa member 1 and the second PCa member 2. , no post-processing of the insert is required. Post-treatment of the grout injection hole 7 into which the locking part 15 of the temporary receiving device 9 is inserted is necessary, but since the grout injection hole 7 is configured separately from the joint 4 and is necessary for the joint of the main reinforcements 1b and 2b. , the construction effort does not increase.

Even if a deviation occurs in the relative arrangement of the first PCa member 1 and the second PCa member 2, the flexibility of the tube body 11 into which the fluid is press-fitted absorbs the deviation, and leakage of the joint material can be prevented. Furthermore, since the tube body 11 does not penetrate deep into the gap, the surface of the joint 4 is shallowly positioned relative to the side surfaces of the first PCa member 1 and the second PCa member 2, and no post-filling process is required.

FIG. 5 shows a first modification of the joint form 5. As shown in FIG. The first modification differs from the above embodiment in that the length of the elongated material 12 can be changed so that the joint form 5 can be used for PCa columns with different thicknesses.

Each elongated member 12 includes a pair of first elongated members 19 having a tube shape, and a pair of first elongated members 19 having both ends slidably received inside the tube shape of the corresponding first elongated member 19. and a second elongated member 20. A square steel pipe can be used as the first elongated member 19, and a rectangular steel pipe whose thickness is one size smaller than the first elongated member 19 can be used as the second elongated member 20. The tube body 11 is preferably fixed to only one of the pair of first elongated members 19 by pasting or the like. The length of the elongated material 12 can be changed by sliding the first elongated material 19 with respect to the second elongated material 20. The elongated material 12 includes a stopper (not shown) such as a ratchet mechanism that regulates relative displacement between the first elongated material 19 and the second elongated material 20 so that the changed length can be maintained. It is preferable. Note that the elongated material 12 is constituted by one first elongated material 19 and one second elongated material 20 whose one end side is slidably received inside the first elongated material 19. Good too.

If the formwork surface is not flat over its entire length, grout will leak due to the grout injection pressure. Since the second elongated material 20 slides inside the first elongated material 19, a step is created between the surface of the first elongated material 19 and the surface of the second elongated material 20, but the tube body Since this level difference is absorbed by the joint material 11, leakage of the joint material can be prevented even if the length of the elongated material 12 is made variable by such a structure.

6 and 7 show a second modification of the joint form 5. FIG. The joint form 5 further includes a sheet 21 stacked on the tube body 11 and fixed to the frame body 10 so as to contact the joint material injected between the first PCa member 1 and the second PCa member 2. The sheet 21 extends around the entire circumference of the frame 10. For example, the sheet 21 is fixed at the lower part to the lower surface of the square steel pipe that constitutes the long material 12 with screws 22 or the like, and at the upper part is fixed to the upper surface of the square steel pipe that constitutes the long material 12 with a hook-and-loop fastener 23 or the like. Ru. By fixing the upper part with a hook-and-loop fastener 23 that is easy to attach and detach, even if the tube body 11 is deformed due to manufacturing/construction errors of the first PCa member 1 and the second PCa member 2, the seat 21 can be easily positioned according to the deformation. can be adjusted to

It is preferable that a plurality of sheets 21 be provided so as to overlap each other. In this case, each of the plurality of sheets 21 preferably has a perforation line 24 along the extending direction of the frame 10 in a portion that does not contact the joint material. Although the sheet 21 placed on the surface layer comes into contact with the joint material and becomes dirty, by cutting the sheet 21 along the perforation line 24 and removing it without washing, the clean sheet 21 underneath is used as the surface layer, and other The joint form 5 can be used for constructing joints 4 at certain locations. Transporting water to the upper floors of buildings under construction increases costs, so water conservation is required during construction on the upper floors of buildings. By using a plurality of sheets 21 in this manner, the sheets 21 do not have to be washed, water usage can be saved, and the joint form 5 can be reused.

FIG. 8 shows a third modification of the joint form 5. In the third modification, a cam lever 25 is provided at one end of the long material 12 to be tightly connected to each other, and a cam lever receiver 26 including a hinge bolt is provided at the other end, and by tilting the cam lever 25, the long material 12 is The ends may be fastened together. The cam lever 25 allows the ends of the elongated material 12 to be fastened together more easily than the screws 18 (see FIG. 2).

Although the description of the specific embodiments has been completed above, the present invention is not limited to the above-mentioned embodiments and can be widely modified and implemented. The locking portion may be inserted into and locked into a grout injection hole or an air discharge hole of a sleeve provided in the first PCa member. In this case, it is preferable that the placing part is located above the locking part, and the base end of the placing part is connected to the intermediate part of the connecting part in the vertical direction.

1: First PCa member 2: Second PCa member 4: Joint 5: Joint form 6: Sleeve 7: Grout injection hole (horizontal hole)
9: Temporary receiving device 10: Frame body 11: Tube body 12: Long material 15: Locking portion 16: Placement portion 17: Connecting portion 19: First long material 20: Second long material

Claims (5)

A method for fixing joint forms for forming joints at mutual joints of a plurality of precast concrete members, the method comprising:
arranging a second precast concrete member on the top surface of the first precast concrete member with a gap corresponding to the joint;
Temporarily supporting the joint form by locking a temporary support device to one of the first and second precast concrete members and placing the joint form on the temporary support device;
fixing the joint formwork to the first and second precast concrete members;
removing the temporary receiving device from the one side,
The one has a sleeve that communicates with the gap and receives a main reinforcement protruding from the other concrete portion of the first and second precast concrete members, and a horizontal hole extending from the sleeve to a side surface of the one concrete portion. have,
The temporary receiving device includes a locking part that is inserted into the horizontal hole and locked, a placement part that places the joint form, and a connecting part that connects the locking part and the placement part. A method for fixing joint formwork, comprising: The joint formwork includes a plurality of elongated members extending along the upper edge of the first precast concrete member and the lower edge of the second precast concrete member,
The step of temporarily supporting includes placing each of the elongated materials on the temporary receiving device,
The fixing step includes connecting the ends of the plurality of elongated members to form a frame surrounding the upper end of the first precast concrete member and the lower end of the second precast concrete member; The ends of the plurality of elongated materials are tightly connected to each other so that the outline of the frame becomes small, and the edges of the frame and the upper end side of the first precast concrete member and the lower end side of the second precast concrete member are 2. The method for fixing joint formwork according to claim 1, further comprising increasing pressure between the joint formwork and the side surface. The joint form includes a flexible tube attached to the inside of the frame to seal the gap,
The method for fixing a joint form according to claim 2, wherein the fixing step includes pressurizing a fluid into the tube body. A joint form for forming a joint between a first precast concrete member and a second precast concrete member disposed above the first precast concrete member is temporarily supported, and after fixing the joint form and A temporary receiving device that is removed before injection of material,
It is inserted into a horizontal hole extending from a sleeve provided in one of the first and second concrete and communicating with a gap corresponding to the joint to a side surface of the concrete portion in the one, and is locked so as to be movable in the direction of insertion. a locking part for placing the joint form, a placing part for placing the joint formwork, and a connecting part for connecting the locking part and the placing part,
The temporary receiving device is characterized in that the mounting portion is arranged parallel to and on the same side as the locking portion with respect to the connecting portion. The connecting portion and the mounting portion are formed of a steel plate bent to have an L-shape when viewed from the side,
5. The temporary receiving device according to claim 4, wherein the locking portion is comprised of a tube that fits into the horizontal hole and is attached to the steel plate.

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