JP2000045433A - Form fitting method and work execution method of concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form fitting method that can adjust the level so as to obtain an almost flat face state in the case of fitting a plurality of panel members as an embedded form and provide a work execution method of a concrete structure that can adjust the level so as not to have step difference in the case of fitting concrete moldings such as balustrades adjacently. SOLUTION: Panel members 11 constituting an embedded form are disposed at post-executed anchors 14 formed at existing concrete 13, through coil springs 15, and fasteners 16 are thread-fastened and locked into fitting holes 12 opened in the panel members 11. The fasteners 16 are tightened and adjusted against the resiliency of the coil springs 15 to finely adjust the outer side face level of the panel members 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a formwork capable of adjusting a level so as to have a substantially flat surface when mounting a plurality of panel materials as a buried formwork, and concrete molding of a railing or the like. The present invention relates to a method of constructing a concrete structure capable of adjusting a level so that a step does not occur when a body is attached adjacently.

[0002]

2. Description of the Related Art Conventionally, in a method of increasing the thickness of a floor slab or a method of repairing a concrete structure, a flat surface which is flush with an existing concrete surface is formed with a substantially constant space. A method has been adopted in which a formwork is attached to a mold, and ready-mixed concrete (prepared concrete) is poured into a space inside the formwork. A panel material is used for such a form for preparing the ready-mixed concrete, but the casting thickness is regularly adjusted with a separator, a spacer, a bolt, and the like, and a foam tie (registered trademark), a single pipe, The method of fixing with a nut etc. was adopted.

[0003]

However, in the above-mentioned conventional method, the dimensions of the separator, the spacer, or the panel material vary, or the existing concrete surface (or the contact surface with the panel material) on which the separator or the spacer abuts. ) Is a rough surface, is partially crushed by tightening, etc., and sand is interposed on the contact surface.
In many cases, it cannot be mounted on a substantially flat surface, and a step is formed between adjacent panel materials. Further, even if these steps can be found before the concrete is cast, the work must be extremely troublesome and difficult because the panel must be removed once to adjust the level. In addition, the adjustments often did not end at once. Further, even if the concrete is installed in a substantially flat shape before the concrete is cast, if the concrete is cast in the inner space, the casting pressure acts from the inside, so that a step is often formed.

[0004]

Means for Solving the Problems The present invention has been proposed in view of the above, and a panel material constituting a buried form is disposed on a post-construction anchor formed on existing concrete with a coil spring interposed therebetween. Formwork that finely adjusts the level of the outer surface of the panel material by screwing the fastener and locking it in the mounting hole opened in the panel material, and tightening and adjusting the fastener against the elastic repulsion of the coil spring It is related to the mounting method. Note that the post-installed anchor may be a male screw portion or a female screw portion, and accordingly, a fastening tool may be a nut for the male screw portion and a bolt for the female screw portion. That is, the present invention is roughly classified into a first embodiment in which the post-installed anchor is a male screw portion and a fastener is a nut, and a second embodiment in which the post-installed anchor is a female screw portion and the fastener is a bolt. is there. And the first
In the aspect of the present invention, a coil spring is attached to a male screw part protruding from existing concrete, and further inserted into a mounting hole formed in a panel material constituting a buried formwork, and then a nut is screwed into a tip of the male screw part. Then, by tightening and adjusting the nut against the elastic repulsive force of the coil spring, a method of mounting a mold for finely adjusting the level of the outer surface of the panel material is achieved. Second
The aspect of the above, on the internal thread formed in the existing concrete,
Arrange the coil spring and the panel material constituting the buried formwork,
By arranging bolts to penetrate the mounting hole and coil spring opened in the panel material and screwing it into the female screw part, tightening and adjusting the bolt against the elastic repulsive force of the coil spring, the outer surface of the panel material It is a method of attaching a mold to finely adjust the level. Furthermore, the present invention also proposes a method for constructing a concrete structure, in which a fixed portion of a concrete molded body is disposed with a coil spring interposed therebetween, after the existing concrete is formed, and a fastening tool is provided. Screw it and lock it in the mounting hole opened in the fixed part,
The thickness of the inner space of the fixed portion of the concrete molded body is finely adjusted by tightening and adjusting the tightening tool against the elastic repulsive force of the coil spring, and then a filler is poured into the inner space.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the panel material constituting the buried formwork is not particularly limited in its material, but may be a precast concrete plate, a fiber reinforced concrete plate, a slate plate, an impregnated slate plate, or the like. Can be used. In addition, it is 5m on one side (the inner side when using).
A material obtained by attaching about m aggregates (face stones) with an epoxy adhesive or the like may be used. When the aggregate is attached to one side, the area of contact (adhesion) with the filler to be cast (injected) after the installation of the panel material is increased, so that high adhesive strength is obtained. For the same purpose, the contact area with concrete may be increased by appropriately subjecting one surface to a concavo-convex treatment or the like. As the filler, various concrete compositions such as mortar and grout, resin liquids such as epoxy and the like may be appropriately selected according to the application.

[0006] A plurality of mounting holes are formed in the panel material, and the mounting holes are bolts as fasteners to be inserted from the outer surface side of the panel material or bolts as post-installation anchors erected on existing concrete. The shape and size are not particularly limited as long as they can be inserted. For example, in the shape, the hole diameter may be constant, or the hole diameter may be reduced from the outside to the inside, and the cross-sectional shape may be tapered. Further, for example, the size of the hole diameter may be smaller or larger than the diameter of a nut or a bolt head, which is a fastener, or a coil spring.
When the hole diameter is larger than the diameter of a nut, a bolt head, or a coil spring, a predetermined effect can be achieved by using a locking member such as a washer. The method for forming such mounting holes is not particularly limited either. For example, the mounting holes may be formed by using a suitable jig on a panel member formed in a plate shape, or may be formed in advance by using a mold (= panel member). Injecting the material with the pins that are formed to be almost the same as the inner diameter of the mounting holes in the support plate that constitutes the
The pins may be pulled out after molding, or may be formed by any other means.

In the present invention, adjusting the level of the outer surface of the panel material is basically equal to adjusting the thickness of the space formed inside the panel material, but the thickness of the inner space is made uniform. However, if the thickness of the panel material used varies, or if the existing concrete surface has irregularities or gradients, a step may be formed at the joint between the panel materials. By adjusting the level of the outer surface of the panel material, even if there is unevenness in the thickness of the panel material, unevenness or gradient of the existing concrete surface, or the edge of the mounting hole of the panel material may be partially damaged Also, it is possible to make the surfaces of the panel materials flush so that no step is formed between the joints. Adjusting the thickness of the inner space of the panel material is basically to make the thickness of the inner space uniform, but in consideration of the above case, it is not always necessary to make the thickness uniform. The level of the outer surface of the panel material may be adjusted so as to be uniform. After all, in the present invention, adjusting the thickness of the inner space of the panel material is considered to be the same as adjusting the level of the outer surface of the panel material. The same applies to the case where a concrete molding such as a railing is used instead of the panel material, and the thickness of the inner space may be uniform, and the height level of the outer surface (upper surface) of the fixing portion may be uniform. Or the height level of an appropriate portion such as the uppermost portion of the concrete molding may be adjusted.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings, but the present invention is not limited to these embodiments. In the first to fourth and sixth embodiments shown in FIGS. 1 to 4 and 6, the first embodiment uses a male screw portion (post-installed anchor bolt) as a post-installed anchor and a nut as a fastening tool. Embodiment 5 is an embodiment of the aspect, and a fifth embodiment shown in FIG.
It is an Example of the said 2nd aspect which used the internal thread part (post-installed anchor nut) as a post-installed anchor and the bolt as a fastening tool.

In the first embodiment shown in FIG.
1, a plurality of mounting holes 12 having a constant hole diameter are formed. The mounting hole 12 is formed slightly larger than the outer diameter of the post-installed anchor bolt 14 protruding from the existing concrete 13 and smaller than the coil spring 15 and the nut 16. Further, a sealing material may be provided in the mounting hole 12 in advance.

In the first embodiment, first, a hole is drilled in an existing concrete 13 and a post-installed anchor bolt 14 is embedded and fixed, and then a coil spring 15 is mounted on the post-installed anchor bolt 14. Next, the post-installed anchor bolt 14
The panel member 11 is mounted so that the panel material 11 is inserted into the mounting hole 12. In this state, only the weight of the panel material 11 acts on the coil spring 15 and the coil spring 15 is contracted and deformed. When the nut 16 is screwed into the post-installed anchor bolt 14 and tightened against the elastic repulsive force of the coil spring 15, the nut 16
The panel member 11 is lowered in a state where the lower end of the nut 16 is locked to the inner (lower side) edge of the mounting hole 12 of the panel member 11 with the tightening of the panel member 11. In this case, the nut 16 may be finely adjusted by tightening the nut 16 until the outer surface of the left panel material 11 is flush with the outer surface (= upper surface) of the right panel material 11 already attached. Since the elastic repulsive force of the coil spring 15 always acts on the panel material 11 from the inner surface side,
Temporary stress such as the weight of the worker acts on the panel material 11.
When the stress is released even if the position is lowered, the position returns to the finely adjusted position (ascends). If the left panel member 11 is lower than the right panel member 11 due to excessive tightening of the nut 16, the nut 16 is loosened (turned in the opposite direction to the tightening direction) to resilient the coil spring 15. The panel material 11 is raised by force and can be flushed.

When the weight of the panel member 11 acts on the coil spring 15 before the nut 16 is tightened as described above, the coil spring 15 contracts and deforms. If the thickness is not larger than the predetermined thickness, the above-described operation cannot be achieved. Therefore, it is necessary to use the coil spring 15 which does not drop below the design height due to the weight of the panel material 11. For example, the weight of the panel material is 100 kgf, and when the
When selecting a coil spring that sinks (= the amount of shrinkage deformation is 5 mm), the spring constant k = 100 / 0.5 from P = kδ.
= 200 kg / cm coil spring may be used.

After the panel member 11 is attached in this manner, a ready-mixed concrete or the like (not shown) may be driven into the inner space 17 according to a conventional method. As described above, in the conventional mounting method, no pressure is applied from the inside at the time of mounting, so that a step is often caused by the driving pressure of the ready-mixed concrete or the like. Since the elastic repulsion force of 15 acts from the inside, the possibility that a step is caused by driving a ready-mixed concrete or the like is extremely low at least as compared with the conventional mounting method. Further, when the tip of the post-installed anchor bolt 14 or the nut 16 protruding from the surface of the ready-mixed concrete or the like after curing is hindered, the cutting may be appropriately performed using a cutting tool.

A second embodiment shown in FIG.
In addition, a plurality of mounting holes 22 whose hole diameter is reduced from the outside to the inside and the cross-sectional shape is formed in a tapered shape are formed at the inner edge thereof, the inner diameter of which is larger than the outer diameter of the post-installed anchor bolt 24. And a washer having a slightly larger outer diameter than the coil spring 25 and the nut 26 are integrally fixed as a locking member 28. In the first embodiment, the lower end of the mounting hole 22 of the panel member 21 receives the upper end of the coil spring 25, and the upper end of the upper end of the mounting hole 22 receives the nut 26. In the second embodiment, the lower surface of the locking member 28 receives the upper end of the coil spring 25 and the upper surface of the locking member 28 receives the locking of the nut 26.

In the second embodiment, the construction procedure is the same as that of the first embodiment. After the post-installed anchor bolt 24 is attached and fixed to the existing concrete 23, the coil spring 25 is attached to the post-installed anchor bolt 24. What is necessary is just to mount, mount the panel material 21, screw the nut 26, and tighten. The work after the panel member 21 is attached may be performed in exactly the same manner as in the first embodiment. Since the nut 26 is housed in the mounting hole 22, a seal portion is formed around the nut 26 when the ready-mixed concrete or the like is driven into the inner space 27, and the seal portion prevents leakage of the ready-mixed concrete. You may do it. Alternatively, after placing the ready-mixed concrete or the like, only the tip of the post-installed anchor bolt 24 may be appropriately cut, and concrete or a sealing material may be filled so as to fill the inside of the mounting hole 22. Of course, the nut 26 may be cut and removed as in the first embodiment. When the nut 26 is not cut and removed, the above operation can be performed without waiting for hardening of the ready-mixed concrete or the like.

In the third embodiment shown in FIG. 3, a lower end locking member 39 for locking the lower end of a coil spring 35 is attached in the longitudinal direction of the post-installed anchor bolt 34 protruding from the existing concrete 33. ing. Although the lower end locking member 39 in the illustrated embodiment is constituted by a nut and a washer, it is not limited to these, and may be formed in any manner.

In the third embodiment, the structure other than the lower end locking member 39 is exactly the same as that of the second embodiment, and the construction procedure and the like are the same as described above.
The lower end locking member 39 is provided in the inner space 37 of the panel material 31.
There is an advantage that it is not necessary to prepare a coil spring corresponding to the thickness even if the size becomes large. For example, the inner space 37 of the third embodiment is different from the inner space 27 of the second embodiment.
Although the thickness is larger than that of the second embodiment, the present embodiment can be implemented using the panel member 31 and the coil spring 35 which are completely the same as the panel member 21 and the coil spring 25 in the second embodiment.
The same applies to the adjustment of the force required for the tightening adjustment of.

The fourth embodiment shown in FIG. 4 is an example in which a panel member 41 is vertically attached to an existing concrete 43 which is a vertical wall surface. For example, repair of a bridge pier or a side wall of a water channel corresponds to this example. . The structure in which the space for placing the ready-mixed concrete and the like (the inner space 47) is formed in the vertical direction is different from the first to third embodiments, but is similar to the third embodiment in that a lower end locking member 49 is used. By using the lower end locking member 49 for the inner space 47 having a large thickness width, a short coil spring 45 can be used, and the other configuration is the same as that of the first embodiment.

In the fourth embodiment, a coil spring 45 is attached to a post-installed anchor bolt 44 projecting laterally from an existing concrete 43 which is a vertical wall surface, and a panel member 41 is attached in the same manner as in each of the above embodiments. However, since the weight of the panel member 41 does not act on the coil spring 45, no shrinkage deformation occurs. Since the weight of the panel material 41 acts on the upper surface located in the mounting hole 42 of the post-installed anchor bolt 44,
Attachment hole 42 and post-installed anchor bolt 44 for smooth behavior of panel material 41 due to elastic repulsion of coil spring 45
It is desirable to perform a treatment to reduce the influence of contact and friction with the metal. That is, for example, the inner surface of the mounting hole 42 is rough and the male screw portion of the post-installed anchor bolt 44 is deeper.
If the inner surface of the panel is not tight, a strong rotating force is required to screw and tighten the nut 46, the panel member 41 does not move, or the panel material 41 is loosened due to excessive tightening (turned in the opposite direction to the tightening direction). ), The panel material 41 does not return. In such a case, if a process having a lubricating effect is performed on the inner surface of the mounting hole 42, for example, a process of forming a hard flat surface, the nut 46 can be tightened and adjusted with a slight rotating force, and accordingly, When the panel material 41 moves smoothly and is loosened due to excessive tightening,
Will return promptly.

In the fifth embodiment shown in FIG. 5, an existing concrete 53 is first drilled, a post-installed anchor nut 54 is embedded and fixed, and a coil spring 55 is attached to the opening edge of the post-installed anchor nut 54 with an adhesive or the like. Fix with. next,
The inner space of the coil spring 55 is attached to the mounting hole 52 (the locking member 58).
The panel member 51 is attached so as to communicate with the (hole). This panel member 51 is exactly the same as the second embodiment. Then, the bolt 56 is connected to the mounting hole 52 of the panel material 51.
(A hole of the locking member 58) and the coil spring 55, and screwed to the post-installed anchor nut 54 to tighten the bolt 56 against the elastic repulsion of the coil spring 55.
With the head of the bolt 56 locked to the inner (lower side) edge of the hole of the locking member 58 with the tightening of the panel member 51.
Is lowered. In this case, the right side panel member 51 with respect to the outer side surface (= upper surface) of the left side panel member 51 already attached.
The bolts 56 may be finely adjusted by tightening the bolts 56 until the outer surfaces of the are flat.

In the fifth embodiment, only the fastening tool is replaced by a nut instead of a bolt, and the operation and the like are exactly the same as those of the second embodiment. In particular, the mode in which the bolt 56 is used in this way is suitable when the thickness of the inner space 57 is small.

In the sixth embodiment shown in FIG. 6, the existing concrete 63 is a side edge portion of the slab and is usually cast-in-place concrete, and the surface thereof is extremely rough. The post-installed anchor bolt 64 is the upper end of a U-shaped anchor bolt that is buried and buried in a state where it is engaged with the reinforcing bar 80 arranged inside. Normally, the mortar portion 70 formed along the length direction of the side edge portion of the slab is finished with a trowel or the like to form a flat surface, and the concrete slab (sound insulation wall) 60 is formed on the flat surface. In this sixth embodiment, the fixing part 61 is placed. In this sixth embodiment, the fixing part 61 of the railing 60 is made to correspond to the panel material in the first to fourth embodiments, and the raw concrete mortar part 70 is cast after construction. And so on. That is, a formwork material (not shown) is appropriately arranged at a predetermined position on the side edge of the slab so that the area where the mortar 70 on the drawing is formed becomes an inner space, and the two upper ends of the post-installed anchor bolt 64 A coil spring 65 is attached to each of the fixing portions 61 of the rail 60 so that the upper end of the post-installed anchor bolt 64 is inserted into the mounting holes 62 formed in front and rear.
Is placed. Then, the nut 66 is screwed in, and the nut 66 is tightened and adjusted against the elastic repulsive force of the coil spring 65 to finely adjust the thickness of the space for the mortar 70.

In the sixth embodiment, the mortar portion 6 which has been formed so as to be flat by conventional ironing or the like is used.
0 can be easily formed, and the height levels of the adjacent columns 60 can be matched with extremely high precision.

The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and can be implemented in any manner unless the configuration described in the claims is changed. Can be.

[0024]

In summary, according to the present invention, when mounting a plurality of panel materials as a buried formwork, even if the existing concrete has irregularities or inclinations, or if there is a defect in the edge of the mounting hole of the panel material. Also, the level can be adjusted with high precision so that the plurality of panel members have a substantially flat surface shape. Moreover, since the level adjustment is performed by tightening and loosening the fastener, fine adjustment can be performed very easily.
Further, in the conventional mounting method, since no pressure is applied from the inside at the time of mounting, a step is often caused by the driving pressure of the ready-mixed concrete or the like, but in the present invention, the coil spring is mounted at the time of mounting and adjusting the panel material. Since the elastic repulsion is acting from the inside, no step is caused by the driving of ready-mixed concrete or the like. In addition, a mortar portion having a uniform thickness can be formed so that a step does not occur when a concrete molding such as a railing is attached adjacently.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a first embodiment of the present invention.

FIG. 2 is a side view schematically showing a second embodiment of the present invention.

FIG. 3 is a side view schematically showing a third embodiment of the present invention.

FIG. 4 is a side view schematically showing a fourth embodiment of the present invention.

FIG. 5 is a side view schematically showing a fifth embodiment of the present invention.

FIG. 6 is a side view schematically showing a sixth embodiment of the present invention.

[Explanation of symbols]

11, 21, 31, 41, 51 Panel material 60 High rail 12, 22, 32, 42, 52, 62 Mounting holes 13, 23, 33, 43, 53, 63 Existing concrete 14, 24, 34, 44, 64 Post-construction Anchor bolt 54 Post-installed anchor nut 15, 25, 35, 45, 55, 65 Coil spring 16, 26, 36, 46, 66 Nut 56 Bolt 17, 27, 37, 47, 57 Inner space 28, 38, 58 Locking member 39, 49 Lower end locking member

Claims (2)

[Claims] 1. A panel material forming an embedded formwork is disposed on a post-construction anchor formed on existing concrete with a coil spring interposed therebetween, and a fastening tool is screwed together with a mounting hole formed in the panel material. A method of attaching a formwork in which the level of the outer surface of the panel material is finely adjusted by stopping and adjusting the tightening member against the elastic repulsive force of the coil spring. 2. A fixing portion of a concrete molded body is disposed on a post-construction anchor formed on existing concrete with a coil spring interposed therebetween, and a fastening tool is screwed and locked in a mounting hole formed in the fixing portion. By finely adjusting the thickness of the inner space of the fixed portion of the concrete molded body by tightening and adjusting the fastener against the elastic repulsive force of the coil spring, a concrete structure in which a filler is poured into the inner space is used. Construction method.