JPH08144295A - Execution method of precast reinforced concrete foundation and ruler for execution of work - Google Patents

Abstract

PURPOSE: To position a foundation accurately by inserting the bolt inserting sections of a ruler for the execution of works to each anchor bolt of adjacent precast reinforced concrete foundations and positioning the relative places of the foundations. CONSTITUTION: A plurality of precast reinforced concrete foundations 10 are hung up and juxtaposed. The bolt inserting sections 111, 112 of a ruler 110 for the execution of works are inserted to each anchor bolt 101 of the adjacent foundations 10, and the relative places of the foundations 10 are positioned. Main reinforcements 11A, 11B projected from the cast-in-place concrete sections 12 of the foundations 10 are connected mutually on the rear sides of precast sections 11 while stirrups 19 are arranged, and web reinforcements 20 are disposed and bound at places crossed at right angles with the stirrups 19. Forms are installed around the base concrete placing sections 13 and cast-in-place concrete sections 12 of the foundations 10 while base reinforcements are bound with the main reinforcements 11B of the foundations 10. Concrete is placed to the concrete placing sections 13, 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for a precast reinforced concrete foundation and a construction ruler.

[0002]

2. Description of the Related Art Conventionally, a precast reinforced concrete foundation as disclosed in Japanese Patent Laid-Open No. 2-38626 has been proposed in order to shorten the construction period for building foundation as compared with a cast-in-place reinforced concrete foundation. This conventional precast reinforced concrete foundation is constructed as described in (1) to (3) below.

(1) A plurality of factory-produced precast reinforced concrete foundations are lined up on site.

(2) Reinforcing bars that project from the adjacent precast reinforced concrete foundations on the site where concrete is cast are connected to each other.

(3) Forming a frame around the on-site concrete placing portion of the precast reinforced concrete foundation, and by placing concrete on the on-site concrete placing portion and the base concrete placing portion, the adjacent precast reinforced concrete foundation is placed. Join to form the basis of one.

In the foundation, an anchor bolt hole provided on the floor girder of a steel structure building unit placed on the foundation or on the base of a wooden building is provided at the top end of the foundation. By inserting the anchor bolts, those floor girders or foundations are fastened on the foundation. Therefore, in the prior art, in the above (1), when installing the precast reinforced concrete foundations next to each other, first install one precast reinforced concrete foundation and then hang the other precast reinforced concrete foundation with a crane, etc. Measure the distance between the anchor bolts provided at the top of the precast part with a steel scale, etc., and correct the installation position of the other precast reinforced concrete foundation so that the measured distance between the anchor bolts will be a predetermined value. The relative position is set.

[0007]

However, in the prior art, until the distance between the anchor bolts of the adjacent precast reinforced concrete foundations matches the predetermined value, the installation position of the precast reinforced concrete foundation is corrected and the distance between the anchor bolts is measured again. It is necessary to repeat and many times. For this reason, the number of construction steps becomes large, and it is difficult to improve the accuracy of the installation position.

It is an object of the present invention to quickly and accurately position the relative positions of adjacent precast reinforced concrete foundations.

[0009]

According to a first aspect of the present invention, an anchor bolt is projectingly provided at a top end of a precast portion, and a reinforcing bar is projected at an end portion of the precast portion. In a method of constructing a precast reinforced concrete foundation comprising a plurality of precast reinforced concrete bases, a construction ruler having bolt insertion portions at two positions forming a predetermined anchor bolt distance between adjacent precast reinforced concrete foundations is prepared in advance. The foundations are lined up at the site, and the anchor fittings of the adjacent precast reinforced concrete foundations are fitted with the bolt insertion parts of the above-mentioned ruler to position the relative positions of the adjacent precast reinforced concrete foundations, and the adjacent precast reinforced concrete foundations. Iron sticking out on the site concrete placing part of Connect to each other to each other, in which as the basis of the integral by Da設 concrete on site concrete portion thereof precast reinforced concrete foundation.

The present invention as set forth in claim 2 is the construction ruler as set forth in claim 1, wherein at least one bolt fitting portion has a U-shaped groove opening to a side portion of the ruler, and the anchor bolt. It is configured so that it can be engaged and disengaged from the horizontal direction.

[0011]

According to the present invention as set forth in claim 1, the following effects are obtained. The relative position of the adjacent precast reinforced concrete foundations is determined by inserting the bolt insertion part of the construction ruler into each anchor bolt of the adjacent precast reinforced concrete foundations and positioning the relative position of the adjacent precast reinforced concrete foundations. Can be positioned quickly and accurately.

The present invention according to claim 2 has the following effects. At least one bolt fitting portion of the construction ruler has a U-shaped groove opening to a side portion of the ruler. Therefore, the U-shaped grooved bolt insertion part of the construction ruler is inserted into the anchor bolt of the pre-cast reinforced concrete foundation that is installed in advance, and the U-shaped grooved bolt insertion part of the construction ruler is installed from the horizontal direction to the anchor bolt of the pre-cast reinforced concrete foundation that is installed subsequently. By guiding the subsequent precast reinforced concrete foundation in only one direction to approach / separate from the preceding precast reinforced concrete foundation to the position where it can be engaged, the U-shaped grooved bolt fitting part of the construction ruler is moved from the horizontal direction. It can be inserted into the anchor bolt very easily, and the workability of construction can be improved.

[0013]

EXAMPLE FIG. 1 is a schematic diagram showing a precast reinforced concrete foundation, FIG. 2 is a schematic diagram showing a reinforcing rod connection structure of the precast reinforced concrete foundation, FIG. 3 is a schematic diagram showing a construction procedure of the precast reinforced concrete foundation, and FIG. 4 is a construction ruler. It is a schematic diagram which shows.

Precast reinforced concrete foundation 10
Is manufactured in advance in a factory as shown in FIGS.

Precast reinforced concrete foundation 10
Is the upper and lower main reinforcing bars 11A at the end of the precast portion 11,
The on-site concrete placing part 12 protruding 11B is provided. In addition, as shown in FIG. 2 (B), the precast reinforced concrete foundation 10 is obtained by screwing and connecting the main rebar 11A to the screw-type metal fitting 12A embedded in the end face of the precast part 11 facing the on-site concrete placing part 12. The reinforcing bar 11A may be projected to the end of the precast portion 11.

Further, the precast reinforced concrete foundation 10 is provided with a base concrete placing section 13 in which a lower main reinforcing bar 11B is extended below the precast section 11 and a large number of reinforcing bars 11C are projected.

At this time, the precast reinforced concrete foundation 10 has the precast part 1 as shown in FIGS.
At the end of No. 1, the on-site concrete placing section 12 is provided on the back surface side of the precast section 11.

Further, as shown in FIGS. 1 and 3, the precast reinforced concrete foundation 10 has a lower portion of the precast portion 11 at the side of the projecting portion of the reinforcing rod 11C.
It is provided with a pedestal 14 that protrudes downward more than the protruding amount of C and encloses a part of the intermediate portion of the lower main reinforcing bar 11B.

Further, the precast reinforced concrete foundation 10 is provided with a decorative pattern 15 on the surface of the precast portion 11 as shown in FIG. The decorative pattern 15 is a tile joint pattern that extends vertically and horizontally.

The precast reinforced concrete foundation 10 has an anchor bolt 101 protruding from the top end of the precast portion 11 as shown in FIGS. The anchor bolt 101 has a floor girder of a steel structure building unit placed on a foundation constructed by using a precast reinforced concrete foundation 10 or an anchor bolt hole provided in a base of a wooden building is inserted through the floor girder. Alternatively, the foundation is fastened on the foundation. Therefore, when constructing the foundations, the precast reinforced concrete foundations 10 must be installed so that the distance between the anchor bolts 101, 101 of the adjacent precast reinforced concrete foundations 10 is a predetermined value L.

Therefore, in this embodiment, when installing the precast reinforced concrete foundation 10, a construction ruler 110 as shown in FIG. 4 is used. The construction ruler 110 is made of, for example, a square tube made of steel or the like that does not significantly differ from the linear expansion coefficient of concrete, and anchor bolt fitting portions 111 and 112 are provided at the upper ends thereof, respectively. Both bolt fitting portions 111 and 112 are provided at two positions forming a predetermined inter-anchor bolt distance L of the adjacent precast reinforced concrete foundations 10. One of the bolt fitting portions 111 has a round hole shape, and the other bolt fitting portion 112 has a U-shaped groove shape that opens to a side portion of the ruler 110. As a result, the bolt fitting portion 11 is formed.
1 pre-installed precast reinforced concrete foundation 10
With the anchor bolt 101 fitted in, the ruler 110
Is rotated about the anchor bolt 101 so that the bolt fitting portion 112 can be easily engaged and disengaged from the anchor bolt 101 of the precast reinforced concrete foundation 10 to be installed later in the horizontal direction.

The procedure for constructing the precast reinforced concrete foundation 10 using the construction ruler 110 will be described below. (1) Factory produced precast reinforced concrete foundation 1
0 is collected and transported from the storage to the site. At this time, the precast reinforced concrete foundation 10 is handled in an upright state with the pedestal 14 as a seating surface.

(2) At the site, the installation substrate of the precast reinforced concrete foundation 10 is prepared, and the floor board 16 and the base reinforcement 17 are arranged (FIG. 3 (A)).

(3) Precast reinforced concrete foundation 1
0 is installed by hanging it with a crane. At this time, floor plate 1
A jack plate 18 is arranged on the jack 6, and the pedestal 14 of the precast reinforced concrete foundation 10 is lowered onto the jack plate 18 and installed. By adjusting the position of the jack plate 18, the top height is aligned with that of the precast reinforced concrete foundation 10 (Fig. 3).
(B)). At this time, the decorative pattern 1 attached to the precast portion 11 of the precast reinforced concrete foundation 10
The horizontal joint 15A of 5 gives a level to the basic base portion,
It is used as a standard for level adjustment between adjacent foundations 10.

Further, the bolt insertion portions 111 and 112 of the construction ruler 110 are inserted into the anchor bolts 101 of the adjacent precast reinforced concrete foundations 10 to position the relative positions of the adjacent precast reinforced concrete foundations 10. At this time, the construction ruler 110 is a state in which the round hole-shaped bolt fitting portion 111 is fitted into the anchor bolt 101 of the pre-installed precast reinforced concrete foundation 10 and then the precast reinforced concrete foundation 1 is installed subsequently.
0 pre-installed precast reinforced concrete foundation 10
Move only in one direction to approach / separate from
The grooved bolt fitting portion 112 is fitted from the horizontal direction into the anchor bolt 101 of the precast reinforced concrete foundation 10 to be installed subsequently, as described above.

(4) The main rebars 11A and 11B protruding from the on-site concrete placing part 12 of the adjacent precast reinforced concrete foundations 10 are connected to each other by the precast part 1
They are connected to each other on the back side of 1 using ties or connectors. The stirrup 19 is arranged at a predetermined pitch. The abdominal muscles 20 are arranged between the upper and lower main reinforcing bars 11A and 11B at a position orthogonal to the stirrup 19, and are bound by iron wires (FIG.
(B)).

(5) Precast reinforced concrete foundation 1
A form 21 is provided around the base concrete placing section 13 of 0 and the on-site concrete placing section 12 (FIG. 3 (C)). still,
Precast reinforced concrete foundation 10 Lower main reinforcement 11
The base muscle 17 is tied to B.

(6) Precast reinforced concrete foundation 1
0 is cast into the base concrete placing portion 13 and then into the site concrete placing portion 12 to join the adjacent precast reinforced concrete foundations 10 to form an integral foundation. In FIG. 1, 23 is a foundation base concrete and 22 is a cast-in-place concrete.

The operation of this embodiment will be described below. Since the bolt fitting portions 111 and 112 of the construction ruler 110 are fitted into the anchor bolts 101 of the adjacent precast reinforced concrete foundations 10 to position the relative positions of the adjacent precast reinforced concrete foundations 10, The relative position of the precast reinforced concrete foundation 10 can be positioned quickly and accurately.

One of the bolt fitting portions 112 of the construction ruler 110 has a U-shaped groove shape that opens to the side of the ruler 110.
Therefore, with the bolt fitting portion 111 of the construction ruler 110 fitted in the anchor bolt 101 of the precast reinforced concrete foundation 10 installed in advance, the construction ruler 110
The subsequent precast reinforced concrete foundation 10 approaches / separates from the preceding precast reinforced concrete foundation 10 until a position where the U-shaped grooved bolt fitting portion 112 of FIG. 11 can be engaged with the anchor bolt 101 of the subsequently installed precast reinforced concrete foundation 10 from the horizontal direction. If it is guided only in one direction, the U-shaped grooved bolt fitting portion 112 of the construction ruler 110 can be moved from the horizontal direction and can be extremely easily fitted into the anchor bolt 101, and construction workability can be improved.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention. For example, the construction ruler may include three or more bolt fitting portions having a predetermined pitch that matches the pitch between the anchor bolts of the foundation. Further, the construction ruler may have a round hole shape for both bolt fitting portions or a U-shaped groove shape for both bolt fitting portions.

The construction ruler may have a function of aligning the streets of the adjacent precast reinforced concrete foundations or a function of a leveler for leveling the precast reinforced concrete foundations.

[0033]

As described above, according to the present invention, the relative positions of adjacent precast reinforced concrete foundations can be positioned quickly and accurately.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a precast reinforced concrete foundation.

FIG. 2 is a schematic view showing a reinforcing bar connection structure of a precast reinforced concrete foundation.

FIG. 3 is a schematic diagram showing a procedure for constructing a precast reinforced concrete foundation.

FIG. 4 is a schematic view showing a construction ruler.

[Explanation of symbols]

 10 Precast Reinforced Concrete Foundation 11 Precast Section 101 Anchor Bolt 110 Construction Ruler 111, 112 Bolt Insertion Section

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshiki Nogami 32 Wadai, Tsukuba City, Ibaraki Prefecture Sekisui Chemical Co., Ltd. (72) Inventor Kunio Ando 4-7-35 Mei Station, Nakamura-ku, Aichi Prefecture Heim Construction Co., Ltd. (72) Masanori Masakatsu 4-7-35 Mei Station, Nakamura-ku, Nagoya, Aichi Prefecture Sekisui Heim Construction Co., Ltd.

Claims (2)

[Claims] 1. A method for constructing a precast reinforced concrete foundation, comprising an anchor bolt projecting from the top end of the precast part, and a site concrete placing part in which a reinforcing bar projects from the end of the precast part. Pre-cast reinforced concrete foundations Prepare a construction ruler that has bolt insertion parts at two positions that make a predetermined distance between anchor bolts, arrange multiple pre-cast reinforced concrete foundations on-site, and each adjacent pre-cast reinforced concrete foundation Insert the bolt fitting part of the above-mentioned construction ruler into the anchor bolt of the above to position the relative position of the adjacent precast reinforced concrete foundations, and reinforce the reinforcing bars protruding into the site concrete placing part of the adjacent precast reinforced concrete foundations to each other. Connect and precast them Construction method of precast reinforced concrete foundation to be the basis for the integrated and Da設 the concrete on-site concrete portion of the reinforced concrete foundation. 2. The construction ruler according to claim 1, wherein:
A ruler for construction, wherein at least one bolt fitting portion has a U-shaped groove shape that opens to a side portion of the ruler and is configured to be engageable with and disengageable from an anchor bolt in a horizontal direction.