JP2000336663A - Foundation, construction method therefor and bar arrangement unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily improve assembly accuracy of base bar arrangement of a footing by providing a precast concrete bundle and the footing for supporting the bundle, and composing the footing base bar arrangement out of a bar arrangement unit with upper end reinforcements and lower end reinforcements prefabricated in cage shape. SOLUTION: A base bar arrangement 31 of a footing 12 is composed of a bar arrangement unit 34 with upper end reinforcements 32 and lower end reinforcements 33 prefabricated in cage shape. A PC bundle 11 is hung down to an installation part 35 of the bar arrangement unit 34, and anchor reinforcements are settled between the upper end reinforcements 32 and lower end reinforcements 33. The base bar arrangement 31 of the bar arrangement unit 34 and the lower part of the PC bundle 11 are concreted in site to form a footing. Since the bar arrangement unit 34 is thus constituted by prefabricating the upper end reinforcements 32 and lower end reinforcements 33 of the base bar arrangements 31 in cage shape, the thickness of overburden, which is the space dimension of the upper end reinforcements 32 and lower end reinforcements 33, can be made constant with high dimensional accuracy. The assembly accuracy of the base bar arrangement of the footing can therefore be easily improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation, a method for constructing the same, and a bar arrangement unit.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No. 6-5775
As described in Japanese Patent Application Publication No. 9-209, there is a type having a precast concrete bundle and a footing for supporting the bundle. In this conventional technique, the base reinforcement of the footing is composed of an upper reinforcement and a lower reinforcement, and a lower reinforcement is placed on a lower spacer arranged on the ground. A spacer is placed, and a top reinforcing bar is placed on the upper spacer, so that a base reinforcing bar is set.

[0003]

However, the prior art has the following problems. A reinforcing bar (such as a round bar) is arranged on each of the lower spacer and the upper spacer to assemble a base reinforcing bar. The reinforcing bar is easily deviated or deviated from the initial layout, and a certain level required for the base reinforcing bar. It is difficult to improve the rebar assembling accuracy such as securing the cover thickness and securing the linear assemblability in the longitudinal direction of the rebars.

[0004] After the installation of the base reinforcements, the worker cannot get on the base reinforcements when installing the formwork and connecting the connecting reinforcements to the upper and lower reinforcements, so that the workability can be improved. Is bad.

An object of the present invention is to easily improve the assembling accuracy of a foot reinforcing base reinforcing bar.

Another object of the present invention is to improve the workability of a foundation.

[0007]

According to the present invention, there is provided a foundation having a precast concrete bundle and a footing for supporting the bundle, wherein the base reinforcement of the footing has upper and lower muscles. Is constituted by a reinforcing bar unit assembled in a cage shape in advance.

[0008] According to a second aspect of the present invention, in the first aspect of the present invention, the rebar arrangement unit is further configured so as to include an installation portion of a precast concrete bundle at an intermediate portion thereof, and the bundle is installed. Sometimes the upper muscle at the part where the anchoring muscle extending from the bundle body passes is cut, the anchoring muscle is placed between the upper muscle level and the lower muscle level, and the connecting muscle is connected to the cut part of the upper muscle. It is made to become.

According to a third aspect of the present invention, there is provided the method of constructing a foundation according to the second aspect, wherein the step of installing the reinforcing bar unit and the step of installing the precast concrete bundle at an intermediate portion of the reinforcing bar unit are performed. A step of cutting the upper end of the portion where the anchoring streaks extending from the main body pass, and a step of installing the precast concrete bundle in the middle part of the reinforcing bar unit and placing the anchoring streaks between the upper end level and the lower end level And a step of connecting a connecting bar to a cut portion of the upper end bar in the reinforcing bar unit, and a step of casting concrete around a lower portion of the reinforcing bar unit and the precast concrete bundle to form a footing. It was made.

According to a fourth aspect of the present invention, there is provided a bar arrangement unit according to the first or second aspect.

[0011]

According to the first and fourth aspects of the present invention, the following effects are obtained. The reinforcement arrangement unit is configured by assembling the upper reinforcement and the lower reinforcement of the base reinforcement in a cage shape in advance. Therefore, the cover thickness, which is the distance between the upper and lower streaks, can be made constant with high dimensional accuracy, and the quality (cover thickness) important in footing strength can be made constant.

[0012] The reinforcement arrangement unit ensures the straightness installation of the upper and lower muscles in the longitudinal direction, and can easily secure the footing.

After installation of the reinforcing bar unit, the worker can perform operations such as installation of the formwork and connection of the connecting bar to the cut portion of the upper bar bar on the reinforcing bar unit. Can be improved.

According to the second and third aspects of the present invention, the following:
Has the effect of Prepare a base reinforcing bar in the form of a cage reinforcing bar unit, cut the upper bar at the middle part in the longitudinal direction of the reinforcing bar unit, and place the anchoring bar of the precast concrete bundle under the cut portion of the upper bar. By providing a connecting bar at the cut portion of the upper bar, it is possible to improve the workability of installing the base bar and the precast concrete bundle.

[0015] The reinforcing bar unit is continuous at the installation portion of the precast concrete bundle without cutting the lower end bar, and there is no need to connect a connecting bar to the lower end bar. Performance can be improved. Also,
By providing the connecting bar, there is no waste of the reinforcing bar used for the fixing length (overlap length) of the connecting bar. Therefore, costs can be reduced in both the construction aspect and the material aspect.

The work of hanging and installing the rebar arrangement unit can be performed using a crane prepared for the work of hanging and installing the precast concrete bundle, and the workability is good.

[0017]

1 shows a foundation, (A) is an overall plan view, (B) is a partial perspective view, FIG. 2 is a sectional view showing the foundation, and FIG. 3 is a reinforcing unit and a precast concrete bundle. FIG. 4 shows a reinforcement arrangement unit, FIG. 4 (A) is a plan view showing a long reinforcement arrangement unit, FIG. 4 (B) is a plan view showing a short reinforcement arrangement unit, and FIG. 5 is an installation state of a precast concrete bundle. FIG. 6 shows a precast concrete bundle, (A) is a plan view, (B) is a side view, and (C)
7 shows a side view of a reinforcing bar arrangement, FIG. 7 shows a level adjusting structure of a precast concrete bundle, (A) is an overall perspective view, (B) is a perspective view showing a level adjusting means, and (C) is a cross section showing a level adjusting work state. FIG. 8 and FIG. 8 are cross-sectional views showing the manufacturing state of the precast concrete bundle.

The foundation 10 shown in FIG. 1 supports a building constructed by combining building units, for example, and transmits the load to the ground.

As shown in FIGS. 1 and 2, the foundation 10 is composed of a precast concrete bundle (hereinafter referred to as a PC bundle) 11 installed immediately below a pillar in a building floor, and a PC bundle 11.
And a side plate 13 installed along the outer periphery of the building floor. PC bundle 1
1. After the side plate 13 is produced at the factory, it is carried into the site and used. The footing 12 is formed by being cast in place.

As shown in FIG. 5 to FIG.
An anchor bolt 22 composed of a bundle main body 21 having a shape such as a mold, a T shape, a cross shape, etc., protruding from the upper surface of the bundle main body 21.
And the fixing streaks 23 extending from the lower surface of the bundle main body 21
And a fitting 24 for connecting the side plate 13 of the bundle main body 21 to the end face to which the side plate 13 is connected. Anchoring muscle 23
Are installed together with a base reinforcing bar 31 of the footing 12 which will be described later.

As shown in FIG. 7, the PC bundle 11 includes three or more level adjusting bolts 25 penetrating from above the upper surface of the bundle main body 21 to below the lower surface thereof. Is mounted on a flat plate-shaped receiving metal 26 arranged on the ground. At the upper end of the level adjustment bolt 25, a suspension hook 25A is provided. The level adjusting bolt 25 is a bolt insertion pipe 2 already embedded in the PC bundle 11.
7 is screwed to the lower end nut 27A.

The PC bundle 11 is manufactured as follows (FIG. 8). (1) A bottomed box-shaped formwork 28 is prepared, and the anchor bolts 22, the fixing streaks 23, and the bolt insertion pipes 27 are arranged inside the formwork 28. The anchor bolt 22 protrudes to the outside from a bolt insertion hole provided in the bottom plate of the formwork 28, and
3. The bolt insertion pipe 27 is arranged upward from the upper opening of the formwork 28.

(2) Concrete is poured from the upper opening of the formwork 28 and the bundle body 21 is upside down. by this,
The fixing streaks 23 implanted in the bundle main body 21 are extended to the upper opening of the formwork 28.

(3) The mold 28 is removed from the mold, the fixing streaks 23 extending from the bundle main body 21 are bent into an L-shape, and the leading ends of the fixing streaks 23 are extended laterally.

The base reinforcing bar 31 of the footing 12 is composed of a reinforcing bar unit 34 in which upper and lower reinforcing bars 32 and 33 are assembled in a cage in advance. At this time, bar arrangement unit 3
As shown in FIG. 3 and FIG. 4A, 4 is configured to be long so as to include the installation portion 35 of the bundle main body 11 in an intermediate portion thereof.
Then, the PC bundle 11 to the installation unit 35 for the PC bundle 11
At the time of installation, the upper end streaks 32 where the fixing streaks 23 extending from the bundle main body 21 pass are cut (cut portions 3).
6), the anchoring muscle 23 is moved to the level of the upper muscle 32 and the lower muscle 3
In addition, the joint bars 37 are connected to the cut portions 36 of the upper end bars 32 while being settled between levels 3. Both ends of the joint bar 37 have a fixed fixing length (overlap length) between the cut end of the upper bar 32.
Take. Note that the lower end muscle 33 of the reinforcement arrangement unit 34 is the PC bundle 1.
It is not cut by the first installation portion 35 and continuously passes below the bundle main body 21.

Next, the procedure for constructing the foundation 10 will be described. (1) Form the ground.

(2) The installation position of the PC bundle 11 is determined on the ground, and a receiving metal 26 for the level adjusting bolt 25 of the PC bundle 11 is installed there. Further, a spacer 38 for the bar arrangement unit 34 is installed outside the installation position of the PC bundle 11 (FIG. 3).

(3) The bar arrangement unit 34 is hung down by a crane and placed on the spacer 38 described in (2) above. Then, the installation section 35 for the PC bundle 11 inside the bar arrangement unit 34 cuts the upper end streaks 32 where the fixing streaks 23 pass when the PC bundle 11 is installed, thereby forming a cut section 36.

(4) The PC bundle 11 is suspended by a crane on the installation portion 35 of the bar arrangement unit 34, and the fixing line 23 is
Put it between 2 and the lower muscle 33. Then, the level adjusting bolt 25 provided on the bundle main body 21 is placed on the receiving metal 26,
As shown in FIG. 5, the PC bundle 11 is positioned in the horizontal direction by sliding the level adjusting bolt 25 on the receiving metal 26, and the PC is adjusted by screwing the level adjusting bolt 25.
The upper surface level of the bundle 11 is adjusted.

(5) The side plate 13 is connected to the fitting 24 of the adjacent PC bundle 11 at a position along the outer periphery of the building floor.

(6) A connecting bar 37 is connected to the cut portion 36 of the upper end bar 32 cut in the above (3).

(7) Concrete is cast in place on the base reinforcement 31 of the reinforcement arrangement unit 34 and the lower part of the PC bundle 11 to form the footing 12. Thereafter, before the concrete is completely solidified, the level adjusting bolt 25 of the PC bundle 11 is pulled out.

Incidentally, the above-described bar arrangement unit 34 is similar to the one shown in FIG.
As shown in FIG. 4 (A), it is made to be long so as to include the installation portion 35 for the PC bundle 11 in the middle part in the longitudinal direction. However, in the embodiment of the present invention, as shown in FIG. PC bundle 11
Separate bar arrangement units 34, 34 may be installed on both sides of the installation position. At this time, the PC bundle 11 moves the anchoring muscle 23 between the two reinforcing arrangement units 34, 34 arranged adjacently on the ground at the level of the upper end muscle 32 and the level of the lower end muscle 33 of the two arrangement units 34. It is installed so as to be located between the two reinforcing bars 34, and thereafter, the upper reinforcing bars 32 of both the reinforcing bars 34 are connected with the connecting bars 37, and the lower reinforcing bars 33 of the both reinforcing bars 34 are also connected with the connecting bars 37. Becomes

Therefore, according to the present embodiment, the following operations are provided. The reinforcement arrangement unit 34 is configured by assembling the upper reinforcement 32 and the lower reinforcement 33 of the base reinforcement 31 in a cage shape in advance. Therefore, the cover thickness, which is the distance between the upper end streaks 32 and the lower end streaks 33, can be made constant with high dimensional accuracy, and the quality (cover thickness) important for the strength of the footing 12 can be made constant.

The rebar arrangement unit 34 secures straightness in the longitudinal direction of each of the upper and lower muscles 32 and 33, so that the footing 12 can be easily secured.

After installation of the bar arrangement unit 34, the operator
Work such as installation of the formwork and connection of the splice 37 to the cut portion 36 of the upper end bar 32 can be performed on the bar arrangement unit 34, and the workability can be improved.

The base reinforcing bar 31 is connected to the cage reinforcing bar unit 3
4, the upper end streaks 32 are cut at the middle part in the longitudinal direction of the bar arrangement unit 34, and the fixing streaks 23 of the PC bundle 11 are placed below the cut portions 36 of the upper end streaks 32. By providing the connecting bars 37 in the cut portions 36 of the bars 32, the workability of setting the base bars 31 and the PC bundle 11 can be improved.

The rebar arrangement unit 34 is continuous at the installation portion of the PC bundle 11 without cutting the lower end line 33, and there is no need to connect the joint line 37 to the lower end line 33. And workability can be improved. In addition, the provision of the joint bars 37 does not waste the amount of reinforcing steel used for the fixing length (overlap length) of the joint bars 37. Therefore, costs can be reduced in both the construction aspect and the material aspect.

The work of hanging down and installing the bar arrangement unit 34 can be performed by using a crane prepared for the work of hanging down and installing the PC bundle 11, and the workability is good.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0041]

As described above, according to the present invention, the assembling accuracy of the footing base reinforcing bar can be easily improved.

Further, according to the present invention, the workability of the foundation can be improved.

[Brief description of the drawings]

FIG. 1 shows a foundation, (A) is an overall plan view,
(B) is a partial perspective view.

FIG. 2 is a sectional view showing a foundation.

FIG. 3 is a perspective view showing a reinforcement arrangement unit and a precast concrete bundle.

4A and 4B show a bar arrangement unit, FIG. 4A is a plan view showing a long bar arrangement unit, and FIG. 4B is a plan view showing a short bar arrangement unit.

FIG. 5 is a side view showing an installed state of a precast concrete bundle.

FIG. 6 shows a precast concrete bundle;
(A) is a plan view, (B) is a side view, and (C) is a side view of reinforcing bars.

FIGS. 7A and 7B show a level adjusting structure of a precast concrete bundle, wherein FIG. 7A is an overall perspective view, FIG. 7B is a perspective view showing a level adjusting means, and FIG. is there.

FIG. 8 is a sectional view showing a state of manufacturing a precast concrete bundle.

[Description of Signs] 10 Foundation 11 Precast concrete bundle 12 Footing 21 Bundle main body 23 Anchoring bar 31 Base reinforcing bar 32 Upper bar 33 Lower bar 34 Bar bar unit 36 Cutting unit 37 Joint bar

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Shimoyama 32 Wadai, Tsukuba-shi, Ibaraki F-term in Sekisui Harmonate Construction Technology Center (reference) 2D046 BA32

Claims (4)

[Claims] 1. A foundation having a precast concrete bundle and a footing for supporting the bundle, wherein a base reinforcement of the footing is composed of a reinforcement unit in which upper and lower muscles are assembled in a cage shape in advance. A foundation characterized by being done. 2. The rebar arrangement unit is configured to include an installation part of a precast concrete bundle in an intermediate part thereof,
At the time of installation of the bundle, the upper muscle at the portion where the anchor streaks extending from the bundle main body pass is cut, and the anchor streaks are stored between the upper muscle level and the lower muscle level, and are joined to the cut portion of the upper muscle. The foundation according to claim 1, wherein the muscles are connected. 3. The method for constructing a foundation according to claim 2, wherein a reinforcing bar unit is installed, and an anchoring bar is extended from the bundle main body when the precast concrete bundle is installed at an intermediate portion of the reinforcing bar unit. A step of cutting the upper reinforcement at a portion where the steel passes, a step of installing the precast concrete bundle in an intermediate portion of the reinforcement unit, and placing the anchoring line between the upper muscle level and the lower muscle level; A method of constructing a foundation, comprising: connecting a reinforcing bar to a cut portion of the above; and placing concrete around a lower portion of the reinforcing member unit and the precast concrete bundle to form a footing. 4. The bar arrangement unit according to claim 1 or 2.