JPS637641Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a formwork used when constructing a concrete structure by pouring concrete at a construction site such as construction work or civil engineering work.

B. Prior art Generally, when constructing a concrete structure by pouring concrete at a construction site, a formwork is erected at the location where the structure is to be constructed, and concrete is poured into the formwork.
Building structures.

Figures 1 and 2 are drawings showing an example of the above-mentioned formwork currently in use. It is used when constructing trapezoidal concrete blocks at construction sites. As shown in the figure, this formwork consists of first and second plates 1 and 2 placed opposite each other, and a first
and an embedded bolt 3 that penetrates between the second plates 1 and 2, and first and second embedded bolts that are threadedly engaged with both ends of the embedded bolt 3 that protrude from the outer surfaces of the first and second plates 1 and 2. 2 support bolts 4 and 5. The embedded bolt 3 is composed of a bolt main body 3a located in the center, and first and second end bolts 3b and 3c screwed into both ends of the bolt main body 3a. A stopper member 6 is fixed to the root portions of the second end bolts 3b and 3c, respectively. After bringing the inner surfaces of the first and second plates 1 and 2 into contact with the stopper member 6,
First and second support bolts 4, 5 are attached to the tips of the first and second end bolts 3b, 3c protruding from the outer surfaces of the first and second plates 1, 2 via spacers 7. are screwed together, and the stopper member 6 and spacer 7 are
By sandwiching the first and second plates 1 and 2 between them, the first and second plates are arranged facing each other.
The plates 1 and 2 are positioned and fixed. The surfaces of the stopper member 6 and the spacer 7 that come into contact with the first and second plates 1 and 2 are sloped so that the first and second plates 1 and 2 are fixed in an inclined state. It is set as. This is because the cross-sectional shape of concrete blocks constructed using formwork is trapezoidal.

To construct a concrete block at a construction site using the formwork with the above configuration, first
Bolt holes 1a for inserting the embedded bolts 3 are drilled in the four corners of the plate 1, and the first end bolts 3b of the embedded bolts 3 are inserted into the bolt holes 1a from the inner side of the first plate 1. Insert it toward the outside surface.
Next, the first plate 1 protrudes from the outer side of the first plate 1.
One end of the embedded bolt 3 is fixed to the first plate 1 by screwing the first support bolt 4 onto the tip of the end bolt 3b via the spacer 7. Next, after positioning the first plate 1 to which the embedded bolts 3 are fixed at a predetermined position on the construction site, the inner surface of the second plate 2, which is placed at a position facing the first plate 1, is The second end of the embedded bolt 3 whose one end is fixed to the plate 1 of 1 is pressed against the tip of the bolt 3c, and a bolt hole 2a for inserting the embedded bolt 3 is formed in the inner surface of the second plate 2. Make a mark for drilling. Next, bolt holes 2a are drilled in the second plate 2 according to this mark. The reason for drilling the bolt holes 2a in the second plate 2 at the construction site is to accurately determine the positional relationship between the first plate 1 and the second plate 2. Then the second
A second embedded bolt 3, one end of which is fixed to the first plate 1, is inserted into a bolt hole 2a drilled in the plate 2.
Insert the end bolt 3c. At the rear is a second end bolt 3 protruding from the outer surface of the second plate 2.
The second support bolt 5 is screwed onto the end of the bolt 3 through the spacer 7, and the other end of the embedded bolt 3 is fixed to the second plate 2. After that, the formwork is positioned and fixed in a predetermined position by fixing the ends of the first and second support bolts 4 and 5 to pipes extending from columns installed near the location where the side gutter is to be constructed. Once a predetermined number of formworks have been installed in this manner, concrete is poured into the formworks. When the concrete hardens, the first and second support bolts 4 and 5 are removed, and then the first and second plates 1 and 2 are removed to construct a concrete block. Incidentally, the embedded bolt 3 bridging between the first plate 1 and the second plate 2 is embedded in the concrete block.

However, when constructing concrete blocks using the above-mentioned formwork, the following disadvantages occurred. That is, after fixing one end of the embedded bolt 3 to the first plate 1, a mark is made on the second plate 2 according to the position of the embedded bolt 3, and then the bolt hole 2a is made in the second plate 2. The disadvantage was that it required drilling, making the formwork construction work complicated. Also, when concrete is poured into the formwork and the first and second plates 1, 2 are removed after the concrete has hardened, the first and second end bolts 3b located in the bolt holes 1a, 2a, Another drawback was that the tips of the bolts 3c would get caught in the bolt holes 1a, 2a, and the first and second plates 1, 2 would break at that part, making it impossible to reuse the plates.

(b) Purpose of the invention When inserting embedded bolts between the first and second plates constituting formwork for constructing concrete blocks, etc., bolt holes are drilled into the first and second plates. The embedded bolt can be inserted through the first and second plates without drilling, and when the first and second plates are removed, the embedded bolt ends of the first and second plates and By preventing the first and second plates from cracking from the engaging portion of the plate, the formwork work is simplified and at the same time, the first and second plates can be reused. It is.

C. Composition of the idea The formwork for constructing concrete blocks, etc. at the construction site is placed in the first
and a second plate 10, 11, and an embedded bolt 12 bridged between the first and second plates 10, 11 such that both ends thereof penetrate the first and second plates 10, 11. and first and second support bolts 13 and 14 that are threadedly engaged with the ends of the first and second plates 10 and 11 of the embedded bolt 12 that protrude toward the outer surfaces, and Openings 10a, 11a are formed at the locations where the embedded bolts pass through the first and second plates 10, 11, and the inner side of the plate has a larger diameter than the outer side of the plate. A sealing member 15 formed in this manner is fitted therein.

D. Example FIGS. 3 to 7 are drawings showing a formwork according to the present invention. and second plates 10, 11, and the first
and the embedded bolt 12 bridged between the second plates 10 and 11, and the first and second embedded bolts 12.
first and second support bolts 13, 14 that are threadedly engaged with the ends protruding toward the outer surfaces of the plates 10, 11;
It is structured by. Openings 10a and 11a formed in the first and second plates 10 and 11
are provided in advance at the locations where the embedded bolts 12 pass through the first and second plates 10 and 11. The openings 10a, 11a have an oval or rectangular shape as shown in FIGS. 4 and 5, and have a stepped portion.
It is tiered. The outer diameter of the inner side of each plate 10, 11 is larger than the outer diameter of the outer side. Also, the openings 10a, 11
The sealing member 15 that fits into the seal member a is made of a material with low rigidity such as styrene foam. Its shape is as shown in FIG. 6, with an opening 10 having a step.
a, 11a, or as shown in FIG.
It is also possible to fit only the portions located on the inner side of the first and second plates 10, 11. That is, the seal members 15 fitted in the openings 10a and 11a are shaped so as not to deviate from the outer surfaces of the first and second plates 10 and 11. Further, as shown in FIG. 8, the openings 10 and 11 are tapered so that the inner side of the plate has a larger diameter than the outer side of the plate.
A tapered sealing member 15 may be fitted to 11. Further, the embedded bolt 12 has a bolt main body 12a located in the center, as in the conventional case.
and first and second end bolts 12b, 12c that are screwed into both ends of the bolt body 12a, and the first and second end bolts 12b, 1
A stopper member 16 is fixed to the root portion of 2c.
After the inner surfaces of the first and second plates are brought into contact with the stopper member 16, the first and second end bolts 12b protrude toward the outer surfaces of the first and second plates 10, 11, The first and second support bolts 1 are attached to the tip of the support bolt 12c via a spacer 17.
3 and 14 are screwed together, and the stopper member 16 and the spacer 1
By sandwiching the first and second plates 10 and 11 between the two plates 7, the first and second plates 10 and 11, which are disposed facing each other, are positioned and fixed.

In the above configuration, in order to construct a concrete block at a construction site using the formwork according to the present invention, first, sealing members are inserted into the openings 10a and 11a provided in the first plate 10 and the second plate 11. 15 is fitted. Next, the sealing member 15 fitted into the opening 10a provided in the first plate 10,
Embedded bolt 1 from the inner side of the first plate 10
The first end bolt 12b of No. 2 is pierced through the sealing member 15, and its tip portion protrudes toward the outer side of the first plate 10. At this time, since the seal member 15 is made of styrofoam, the seal member 15 can be broken through simply by pressing the tip of the first end bolt 12b against the seal member 15. Next, a spacer 1 is attached to the tip of the first end bolt 12b protruding from the outer side of the first plate 10.
One end of the embedded bolt 12 is fixed to the first plate 10 by screwing the first support bolt 13 through the bolt 7 . Next, after positioning the first plate 10 with one end of the embedded bolt 12 fixed at the concrete block construction position, the sealing member 1 fitted into the opening 11a of the second plate 11 is inserted.
5 is brought into contact with the tip of the second end bolt 12c of the embedded bolt 12 whose one end is fixed to the first plate 10. By pressing the second plate 11 toward the first plate 10 in this state, the tip of the second end bolt 12c is made to protrude toward the outer surface of the second plate 11. At this time, since the seal member 15 is made of styrofoam, the second end bolt 12c can easily break through the seal member 15. Next, by screwing the second support bolt 14 through the spacer 17 to the tip of the second end bolt 12c protruding toward the outer surface of the second plate 11, The end is fixed to the second plate 11. After that, the formwork is positioned and fixed in a predetermined position by fixing the ends of the first and second support bolts 13, 14 to pipes extending from pillars installed near the location where the side gutter is to be constructed. When a predetermined number of formworks have been installed in this manner, concrete is poured into the formworks. When the concrete hardens, the first and second support bolts 13 and 14 are removed, and then the first and second plates 10 and 11 are removed to construct a concrete block. Note that when removing the first and second plates 10 and 11, there is a gap between the first and second end bolts 12b and 12c at both ends of the embedded bolt 12 and the first and second plates 10 and 11. Since the seal member 15 is interposed, the seal member 1
Although the plate 5 may be damaged, the first and second plates 10 and 11 will not be damaged. Therefore, the first and second plates 10, 11 can be reused by simply replacing the seal member 15.

E. Effects of the invention As mentioned above, openings are provided in advance at the locations of the first and second plates through which the embedded bolts penetrate, and a sealing member made of a material with low rigidity such as styrofoam is fitted into the openings. If this is done, there is no need to use a drill or the like to drill bolt holes in the first and second plates at the construction site for penetrating the embedded bolts, and the number of work steps for formwork erection work can be reduced. In addition, when the first and second plates are removed from the concrete after the concrete poured into the formwork has hardened, the first and second ends of the embedded bolts passing through the first and second plates are removed. Since it is possible to prevent the first and second plates from breaking due to the bolts being caught on the first and second plates, it is possible to reuse the first and second plates.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional formwork, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a longitudinal sectional view of the formwork according to the present invention, and Fig. 4 is formed on the plate of the formwork. A drawing showing the shape of the opening, Fig. 5 is the same as Fig. 4.
The line sectional view, FIGS. 6 and 7 are drawings showing a state in which the sealing member is fitted into the opening, and FIG. 8 is a drawing showing other shapes of the opening and the sealing member. 10...First plate, 11...Second plate, 10a, 11a...Opening, 12...Embedded bolt, 13...First support bolt, 14...Second support bolt, 15 ...Seal member.

Claims (1)

[Scope of utility model registration request] first and second plates arranged to face each other; and an embedded bolt bridged between the first and second plates with both ends passing through the first and second plates. , consisting of a support bolt that is threadedly engaged with the end portions of the embedded bolt that protrude toward the outer surfaces of the first and second plates; 1. A formwork characterized in that a side thereof has an opening having a diameter larger than that of the outer side of the plate, and a sealing member made of styrene foam or the like is fitted into the opening.