JPS63165623A - Method and instrument for forming piercing hole to concrete structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Field of Application of the Invention> The present invention relates to a method for forming a through-hole through which a water pipe, electric wire, etc. is inserted into, for example, a beam portion of a concrete structure, and a through-hole forming device used therein. .

<Prior art> Conventional methods for forming through-holes in concrete structures and tools for forming through-holes used therein include, for example: (a) As shown in FIG. At the same time, a sleeve 5 serving as a "through-hole forming device" is passed in the width direction into a formwork 4 formed of formwork material 1 and in which assembled reinforcing bars 3 in which reinforcing bars 2 are assembled into a predetermined shape are installed. It is known that the sleeve 5 is fixed by its tensile force, and concrete is poured into the formwork 4, leaving the inner cavity 6 of the sleeve 5 as a "through hole."

(b) It is also known to use a sleeve 5c with both ends partially cut off diagonally (see FIG. 8).

(C) Furthermore, a sleeve 5s that is slightly shorter than the inner width W fathom of the formwork 4 is used, and an appropriate sealing material 7 such as debris that is formed in the gap between the formwork material 1 and the sleeve 5s is filled. known (Figure 7).

<Problems to be Solved by the Invention> However, the above-mentioned conventional methods and through-hole forming instruments are both insufficient in terms of workability and precision in finishing the through-holes. That is, for example, when a beam is used as a concrete structure, the through holes provided in each of the plurality of beams need to be lined up in a straight line, so the through holes in each beam are from several centimeters to several centimeters long depending on the size. Number Cl11
Must be positioned in units. For that purpose, the first
Firstly, the through-hole forming device is installed accurately at a predetermined position in the formwork material 1, and secondly, the through-hole forming device is fixed to the extent that it will not shift due to the poured concrete. Two points are required. However, in the conventional method and through-hole forming device as in (a) above, the length of the sleeve 5 is made slightly longer than the inner width W of the formwork 4 in order to obtain a tensile force.
It is extremely troublesome to cross and install assembled reinforcing bars in the formwork 4, which has already been installed and the work space is limited, and it is not always possible to obtain sufficient fixing force with tensile force alone. Because of this, the concrete that was poured often caused misalignment. The reason why sleeves are conventionally fixed only by tension is to take advantage of the narrow inner width W of the formwork 4, but this means that the working space is that much narrower. However, even if an attempt is made to nail the sleeve 5, the hammer will not swing, and even if the nail is driven with an instrument such as a punch, the nail will not be able to be temporarily held. If a positional shift occurs, the formwork 4 must be removed and a new through hole must be drilled in its original position, but this requires considerable labor and cost, and in some cases, There were some items that could not be chiseled, and this became a problem that could not be ignored. In addition, the above (b) is improved in that a part of both ends of the sleeve 50 are cut off diagonally to make it easier to insert into the formwork 4, which makes it a little easier to carry out the inserting work. , essentially has the same problem as (a) above, and in (C) above, the sleeve 5s has been shortened, making the handing process itself easier, but The filling operation was surprisingly troublesome, and there was also the problem that sufficient fixing force could not be obtained.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for forming a through hole in a concrete structure that has excellent workability and prevents the through hole from being misaligned, and a through hole forming tool used therein.

<Means for solving the problem> As a means for achieving the above object, the first invention (the invention described in claim (1)) includes a cylindrical body shorter than the inner width of the formwork, and a cylindrical body shorter than the inner width of the formwork; Using a through-hole forming tool, the tool includes a pair of flat cylindrical adjusters that are slidably fitted to both ends of a cylindrical body, and the adjusters have a nail hole for holding a nail in one end thereof, and first, Each adjuster is fixed facing each other with nails through the nail hole at a predetermined corresponding position of each formwork material facing each other in the width direction, and then one end of the cylindrical body is attached to one of the adjusters fixed in this way. is fitted to the extent that the other end does not reach the other adjuster, then this cylindrical body is folded back and fitted to the other adjuster, and the fitting portion of this cylindrical body is fixed to each adjuster to form a mold. The gist is to pass the through-hole forming instrument within the frame, and the second invention (claims)
In the invention described in 2), the through-hole forming device comprises a cylindrical body shorter than the inner width of the formwork of the concrete structure, and a pair of flat cylindrical bodies slidably fitted to both ends of the cylindrical body. The main feature is that the adjuster has a nail hole for holding the nail at one end of the adjuster.

<Function> That is, in the first invention, the through-hole forming device is comprised of a cylindrical body shorter than the inner width of the formwork, and a pair of flat cylindrical adjusters that are slidably fitted to both ends of the cylindrical body. Consisting of
The installation work consists of fixing the adjuster to the formwork material - attaching the cylindrical body to the adjuster -> fixing the cylindrical body to the adjuster,
Because the work is divided into two parts, each work only needs to handle adjusters or cylindrical bodies that are of a size that can be easily handled in the narrow work space limited by the reinforcing bars that have already been installed. This not only improves work efficiency but also improves the accuracy of the fixing position, and since the adjuster is fixed with nails, the fixing is more reliable.

Further, the through-hole forming instrument of the second invention is constituted by a cylindrical body shorter than the inner width of the formwork and a pair of flat cylindrical adjusters that are slidably fitted to both ends of the cylindrical body, and Since a nail hole for holding a nail is provided at one end of the adjuster, the installation process consists of fixing the adjuster to the formwork material, attaching the cylindrical body to the adjuster, and then fixing the cylindrical body to the adjuster. In addition, the cylindrical body can be attached to the adjuster using a slidable fit, and nails can be easily driven by temporarily holding it in the nail hole. , excellent workability and fixability.

<Examples> Examples of this invention (first invention and second invention) will be described below.
This will be explained with reference to FIGS. 1 to 4. In the following explanation, the explanation of the first invention will be the main subject, while the second invention will be referred to in relation to the invention, and parts common to the conventional invention will be denoted by the same reference numerals, and duplicate explanations will be omitted. .

The through-hole forming instrument 10 includes a cylindrical body 11 and a pair of adjusters 12, both of which are made of synthetic resin.

The cylindrical body 11 is smaller than the inner width W fathom of the formwork 4 over which the through-hole forming instrument 10 is to be passed, and both ends of the cylindrical body 11 can be easily inserted and fitted into the pair of adjusters 12. The mating portion is short enough to be electrically coupled to the side surface 19 of the adjuster 12 over a certain length, and a plurality of screw holes 13 are provided at both ends thereof.

The adjuster 12 includes an adjuster body 14 having a flat cylindrical shape and a support rod 15 having a T-shaped cross section.

The adjuster body 14 has one end surface serving as a release surface 16 in order to slidably fit the cylindrical body 11 therein.
Further, the receiver whose other end surface has a cross section substantially corresponding to the cross section of the support rod 15 is a closed surface 18 with a groove 17, and further penetrates obliquely from the closed surface 18 side to the side surface 19, so that the adjuster 12 can be molded. A plurality of nail holes 21 are provided for temporary holding so that it is easy to drive fixing nails 20 when fixing to the frame material 1, and a plurality of screw holes 22 are provided on the side surface 19 on the open surface 16 side. . Further, the support rod 15 is provided with a screw hole 23, which is used for temporarily fixing the support rod 15 to the formwork material 1, approximately at the center in its length direction.

A method for forming through holes in a concrete structure using this through hole forming tool 10 will be described below. First, before the assembled reinforcing bars 3 are installed, the support rods 15 are installed at predetermined corresponding positions on each of the formwork members 1 facing each other in the width direction through the screw holes 23 so as to be rotatable in the direction of the arrow X. Attach with screw 24. Since the support rod 15 has a size sufficiently smaller than the gap between the reinforcing bar assembly 3 and the formwork 4, it does not get in the way when the reinforcing bar assembly 3 is installed. Next, after installing the assembled reinforcing bars 3, the adjusters 12 are attached to the screw-fastened support rods 15 through the grooves 17, and in the temporarily fixed state by this attachment, the rotation of the support rod 15 and the adjuster 12 are performed. adjuster 1 by sliding in the direction of arrow Y with respect to support rod 15
2 fixing position, that is, a predetermined corresponding position where a "through hole" should be provided and where the reinforcing bars 2 will not get in the way when installing the cylindrical body 11, and fix the formwork material with nails 20 through the nail holes 21. Fixed to 1. Since the hour hand 20 is held in the nail hole 20 and is oriented diagonally, a tool such as a punch 25 is used to insert the hour hand 20 into the reinforcing bar assembly 3 and the side surface 12 of the adjuster 12.
It can be driven easily without interfering with the Next, by moving as shown by arrow Z in FIG. 5, one end of the cylindrical body 11 is fitted to one adjuster 12R to the extent that the other end does not reach the other adjuster 12L, and then this cylindrical body is 11 is folded back (arrow Z2) and fitted into the adjuster 12L, and the screw holes 13 at both ends are aligned with the screw holes 21 of the adjuster 12, and then fixed to each adjuster A112R and 12t with screws 25. After the passing of the through-hole forming device 10 is completed in this way, concrete is poured into the formwork 4, and the inner cavity 27 of the through-hole forming device 10 is poured.
Leave the inside as a "through hole". Note that the closed end surface 18 is punched out after removing the formwork material 1.

In this way, the through hole forming instrument 10 is constituted by the cylindrical body 11 and the adjuster 12, and the nail hole 20 of the adjuster 12 is provided, and the adjuster 12 is constituted by the adjuster body 14 and the support rod 15. of,
Attaching the support rod 15 to the formwork material 1 before installing the assembled reinforcing bars 3 → Installation of the assembled reinforcing bars 3 → Temporary fixing of the adjuster 12 to the formwork material by the support rod 15 → Positioning of the adjuster 12 and nails 24
Since the work is divided into the following steps: fixation by fixing → attachment of the cylindrical body 11 to the adjuster 12 → fixation of the cylindrical body 11 to the adjuster 12, (a) Attaching the support rod 15 is a large task before installing the assembled reinforcing bars 3. (b) In addition, in each work after installing the assembled reinforcing bars 3, adjusters 12 or cylinders of a size that can be easily handled even in the narrow work space limited by the assembled reinforcing bars 3 are used. (C) Furthermore, during this work, the adjuster 12 is positioned and fixed by rotating the support rod 15 while the adjuster 12 is temporarily fixed by the support rod 15. The work is made easier in that it can be done by using the sliding movement of the adjuster body 14 with respect to the support rod 15, and since the nail 24 is held by the nail hole 20, driving the nail 24 is also facilitated. Overall, it is possible to improve workability, as well as to obtain fixation position accuracy and fixation certainty.

In the above embodiment, the support rod 15 is used as a means for temporarily fixing and positioning the adjuster 12, but the present invention is not limited to this, and for example, a so-called "velcro fastener" may be used. It is also possible to temporarily fix the adjuster 12, which has one side attached to the formwork material 1 instead of the support rod 15 and the other side attached to the closing surface 18, while positioning it on the one side. 17
), or if there is some space in the work space depending on the size of the concrete structure or the size of the reinforcing bars 3, it is possible to use the "adjuster" directly without using these temporary fixing/positioning methods. It is also possible to fix it to the formwork material 1. Furthermore, the cylindrical body 11 is fixed to the side surface 19 of the adjuster 12' after it is fitted without using the screw holes 13, 21 and the screws 25, and instead, a tape is wrapped around the outer periphery of the fitting part to fix and seal the cylindrical body 11. They may also be performed at the same time.

<Effects of the Invention> As explained above, the present invention provides a through-hole forming tool that includes a cylindrical body shorter than the inner width of the formwork, and a pair of flat cylinders that are slidably fitted to both ends of the cylindrical body. The installation work is divided into the following steps: fixing the adjuster to the formwork material → attaching the cylindrical body to the adjuster → fixing the cylindrical body to the adjuster. During work, it is only necessary to handle adjusters or cylindrical bodies of a size that can be easily handled in the narrow work space limited by the already installed reinforcing bars.As a result, work efficiency is improved and the accuracy of the fixing position is improved. It has the excellent effect of providing stability and certainty of fixation (first invention), and also allows the through-hole forming tool to be slid freely on a cylindrical body shorter than the inner width of the formwork and on both ends of this cylindrical body. It consists of a pair of flat cylindrical adjusters that fit into the frame, and a nail hole for holding the nail is provided at one end of the adjuster. The work can be divided into two parts: installation of the cylindrical body to the adjuster, and fixation of the cylindrical body to the adjuster.Moreover, the cylindrical body can be attached to the adjuster using a slidable fitting, and it can also be done using a nail hole. Temporary holding makes it easy to drive nails, so there is also the excellent effect of providing excellent workability and fixing performance (second invention).

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view including a partial cross section showing a state in which the through-hole forming instrument is inserted into the formwork, Fig. 2 is a schematic perspective view of the cylindrical body, and Fig. 3 is a schematic perspective view of the adjuster. Fig. 4 is a schematic perspective view of the support rod, Fig. 5 is a schematic plan view showing the installation procedure of the cylindrical body, and Figs. 6 and 7 are respectively conventional methods for forming through holes in concrete structures. and FIG. 8 is a schematic sectional view showing a through-hole forming instrument, and FIG. 8 is a schematic side view of the sleeve. 1...--Form material 4--111-11 Formwork 627--Inner cavity 10--1111--Through hole forming instrument 11--
- One cylindrical body 1 :L------------Adjuster 20---One nail hole 24 --- Nail method Figure 7 Figure 8 Opening hole

Claims (2)

[Claims] (1) When a through-hole forming device is inserted in the width direction into a formwork formed from formwork materials in accordance with the predetermined shape of a concrete structure, and concrete is poured into the formwork, this through-hole is formed. In a method for forming a through hole in a concrete structure in which the inner cavity of the tool is left as a through hole, the tool for forming a through hole has a cylindrical body shorter than the inner width of the formwork, and a slider on both ends of the cylindrical body. It is equipped with a pair of flat cylindrical adjusters that are movably fitted together, and each of the adjusters is provided with a nail hole for holding a nail at one end thereof, and first, a predetermined correspondence between each of the formwork materials facing each other in the width direction is provided. Fix each adjuster facing each other with a nail through the nail hole, and then attach one end of the cylindrical body to one of the adjusters fixed in this way to an extent that the other end does not reach the other adjuster. Then, the other end of the cylindrical body is fitted to the other adjuster by folding it back, and the fitting portion of the cylindrical body is fixed to each adjuster, thereby forming the through-hole forming device in the formwork. A method for forming a through-hole in a concrete structure, the method comprising: (2) Consists of a cylindrical body shorter than the inner width of the formwork of the concrete structure, and a pair of flat cylindrical adjusters that are slidably fitted to both ends of the cylindrical body, and the adjuster is located at one end of the cylindrical body. An instrument for forming a through hole, characterized in that it has a nail hole for holding a nail.