JPH0715171B2 - Precast reinforced concrete foundation material and foundation construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a precast reinforced concrete foundation material for a building having a reinforced structure, and a foundation construction method thereof.

[Conventional technology]

Conventionally, the foundations of steel frames and reinforcing bars have been subjected to root cutting ground work, solidifying the foundations, and then discarding concrete, then assembling the inside, processing and assembling the reinforcing bars, and then assembling the outer mold. It was done, and this was done with concrete.

[Problems to be Solved by the Invention]

In such a construction method, since one process is completed and the next process is started by stacking processes of different types of work, there is a loss such as waiting time, and there is no choice but to spend a long period of time. For example, about two months is good.

Further, the anchor bolt has a problem in that it is slightly displaced due to the concrete pouring work at the site, and needs to be re-corrected in accordance with the reconfirmation marking.

[Object of the Invention]

The present invention, in order to solve the above-mentioned problems for the construction of conventional reinforced concrete foundation, by forming a base material of precast reinforced concrete, by assembling and constructing this at the site, while shortening the work schedule at the site, By improving the accuracy by factory production, the purpose is to obtain a highly accurate foundation of steel frame and wooden construction without the need for reworking anchor bolts.

[Means for Solving the Problems]

1 of the present invention relates to a precast reinforced concrete foundation material for achieving the above object, wherein reinforcing bars are arranged in a plane, the upper surface anchoring bars of the central portion thereof are exposed, and the reinforcing bars are embedded in concrete in a disk shape. The base plate and the anchor bar of the base plate are placed on the base plate with their side ends close to each other, and the main bar combined with the stirrup is exposed from the side ends and embedded in a prismatic shape and the front and back surfaces It is configured with an underground beam in which inserts are embedded at predetermined intervals.

As for the second, regarding the construction method of the precast reinforced concrete foundation, on the discarded concrete that becomes the foundation surface,
The reinforcing bars are arranged in a plane, the anchor bars are exposed on the upper surface of the central part of the reinforcing bars, and the base plates embedded in the board shape with the reinforced concrete are arranged at predetermined intervals. Place the underground girder exposed and embedded in concrete on the base plate with its side end close to the anchor bar of the base plate, and connect the anchor bar of the base plate and the main bar of the underground beam and This is to use an insert embedded in the underground beam to surround the joint portion with a fixed formwork and then to pour concrete to connect the base plate and the underground beam.

[Action]

In the base material of the present invention, and the construction method using the same, by placing the position of the anchor bar exposed on the upper surface of the base plate at an accurate position, the work of re-updating is unnecessary,
By connecting the exposed part of the main bar of the underground girder placed on the base plate and the anchor bar, and surrounding this part with a fixed formwork and concrete driving, the base plate and the girder are integrated.

Example of Invention

 Next, an example of implementation of the present invention will be described with reference to the drawings.

2 and 3 show the base plate A.

In this base plate A, the force distribution muscles 1 are arranged vertically and horizontally. The column main muscle 3 is formed in an L shape, and the horizontal portion thereof is used as the auxiliary muscle 2, and the auxiliary muscle 2 is obliquely arranged with respect to the force distributing muscle 1.
The main pillar 3, the hoop muscle 12, the distribution muscle 1, and the auxiliary muscle 2 are embedded with concrete 5 so that the lower end of the anchor muscle 4 is embedded and the rising portion of the main pillar muscle 3 is exposed on the upper surface.

At this time, the hanging metal fittings 6 are embedded in the concrete 5 in four directions, and are used for pulling out the base plate A from the casting mold of the concrete 5 and for hanging at the time of installing it.

Further, on the upper surface of the concrete 5, the center lines 7 and 7'are drawn out after the setting and curing.

4 to 6 show the underground beam B.

In this underground beam B, main bars 9 are orthogonally joined to a large number of stir wraps 8 that are bent in a square shape, and the main bars 9 are exposed to the side ends from a predetermined formwork so that concrete 10 is formed in the formwork. And the main beam 9 is exposed from the side end to obtain an underground beam B having a predetermined length.

At the time of this concrete driving, an insert 11 is embedded in the side surface of the underground beam B and used as an insert for fixing a joint anchor for floor reinforcement and a temporary fixing insert for a fixed form frame described later.

The anchor bolts of the studs are also embedded in the upper surface of the underground beam at this time.

Besides, in order to join the underground beam B ₁ and the underground beam B ₂ , FIG. 9,
A small base version C shown in Fig. 10 is prepared.

This is for the relay point of the underground beam B and for fixing the anchor bolt of the small pillar.

Similar to the base plate A, the small base plate C is one in which the distribution muscles 1 ', the auxiliary muscles 2'which are horizontal portions of the column main muscles 3', and the anchor muscles 4'are embedded in the concrete 5. Similar to the base plate A, the column main bar 3'and the anchor bar 4'are exposed and the center line 7'is also drawn on the upper surface.

Next, a method of constructing a foundation using this foundation material will be described with reference to FIG.

First, according to the layout plan, root cutting and abandoned concrete floors will be constructed in the same construction method and order as in the past.

Then, as shown in FIG. 7, the center line 7 of the base plate A is located on a straight line on the abandoned concrete floor finished to the height of the bottom surface of the base plate A, and the center line 7 has a predetermined interval. In this way, the base versions A ₁ , A ₂ , A ₃ ... An are installed.

At this time, the height of the base plate A ₁ , ... An is almost constant due to the discarded concrete, but the fine adjustment is performed by the empty mortar on the discarded concrete.

Similarly, the small base plate C is installed between the base plates A.

Next, on the base plate A and the small base plate C,
As shown in the figure, the underground beam B is placed, but the main bar 9 exposed from the side end of the underground beam B is the main bar 3 of the base plate A.
The small base plate C is in a state of entering from between the main bars 3 toward the center.

Therefore, the main bar 9 of the underground beam B and the main bar 3 of the base plate A are connected to the hoop bar 12 which is bent in a square shape, and these are fixed.

Further, on the small base plate C, the main bar 9 of the underground beam B and the main bar 3 of the small base plate C which are adjacent to each other are connected by a linear joint bar 13 to fix them.

Then, the fixed form 14
Then, the fixed form 14 is temporarily fastened so as to support the lateral pressure of the concrete to be driven in using the insert 11 of the underground beam B.

As the fixed form frame 14, three types are required: one for fixing the underground beam B on the base plate A in a straight line, one for fixing the underground beam B at a right angle, and one for fixing on the small base plate C. It can be easily attached and detached.

If the anchor bar 4 is fixed from the upper end of the fixed form 14 via the auxiliary plate 21, it can be accurately installed on the basic black, and the center line 15 of the underground beam B can be set. As well as
Can be installed accurately.

Therefore, the re-confirmation of marking does not cause a correction correction.

Thus, after driving the concrete into the fixed form 14,
The fixed form 14 is removed, and the foundation construction is completed.

Although the embodiment using the small base plate C has been described above, the small base plate C may be omitted depending on the distance between the columns. The base plate A can also be a board with a haunch.

In the above examples, since the adhesive force between the concrete and the reinforcing bar is proportional to the surface area of the reinforcing bar, the deformed reinforcing bar having a nominal diameter of 13 to 16 mm SD30 has a fixing length of 40 cm or more and 30 d or more is secured.

When the present invention is carried out in a flat structure of steel frame structure of 45 m × 34 m = 1530 m ² with 18 small columns, 33 columns, and underground beam extension of 158 m, the number of process days is as follows.

Conventional construction method Ink scraping process 0.5 days Installation process 1.5 days Re-inking process 0.3 days Joint temporary frame process 0.5 days Joint concrete pouring 0.5 days Total 3.3 days Construction work has been greatly shortened.

〔The invention's effect〕

As described above, the present invention uses the precast reinforced concrete as the base plate and the underground girder to install it at the construction site, and wet concrete is only driven into the joint part with the fixed form, and in an extremely short construction period. The construction of a heavy foundation is completed.

Also, in the fixed formwork, the main reinforcement of the underground beam and the anchor reinforcement of the base plate are connected and concrete is driven in, so they are mechanically integrated in any direction and the strength of the foundation is increased. Does not deteriorate.

As described above, by using the foundation material of the present invention and constructing it, the construction period can be shortened and the wage can be reduced. Further, the underground beam and the base plate are factory-produced with precast reinforced concrete. Therefore, a highly accurate and reliable base material can be obtained.

In addition, what is particularly effective in the construction method of the present invention is to connect the base plate and the underground beam, and use the insert embedded in the underground beam for the fixed formwork used when driving concrete into this connection portion. Since the fixed form can be attached and detached as compared with the conventional method, the workability is improved and the work period can be further shortened.

[Brief description of drawings]

FIG. 1 is a plan view of the entire construction, FIGS. 2 and 3 are side views and plan views of the base plate, and FIGS. 4 to 6 are cross-sectional views and plan views of the underground beam, and side views, FIGS. 7 and 8 are a plan view and a side view of the main part during construction, and FIGS. 9 and 10 are a side view and a plan view of the small base plate. A ... Base version, B ... Underground beam, C ... Small base version, 1
…… Strengthening muscle, 3 …… Main reinforcement, 4 …… Anchor reinforcement, 5 …… Concrete, 9 …… Main reinforcement, 10 …… Concrete, 12,13
...... Connecting bars, 14 ...... Standard formwork.

Claims (2)

[Claims] 1. A base plate in which reinforcing bars are arranged in a plane, the upper surface anchor bars of the central portion thereof are exposed, and the reinforcing bars are embedded in concrete in a disk shape, and side ends of the anchor bars of the base plate are provided. Placed close to each other on the base plate, the main bar connected to the stirrup is exposed from the side end, embedded in a prismatic shape, and composed of underground beams with embedded inserts at regular intervals on the front and back surfaces. Precast reinforced concrete foundation material characterized by 2. Reinforcing bars are arranged in a plane on a waste concrete which is a foundation surface, and an anchor bar is exposed on an upper surface of a central portion of the base, and base plates embedded in a plate shape with the reinforced concrete are arranged at predetermined intervals. Then, the main beam connected to the stirrup is exposed from the side end and the underground beam is embedded in concrete.Place the side end near the anchor bar of the base plate and place it on the base plate. After connecting the anchor bars of the and the main bars of the underground girder and using the insert embedded in the underground girder to surround the circumference of the connected part with a fixed formwork, concrete is driven in and the base plate and the underground girder are embedded. A precast reinforced concrete foundation construction method characterized by connecting to.