JPH0571131A - Perpendicularity maintaining jig for precast concrete foundation - Google Patents

Abstract

PURPOSE:To perpendicularly maintain a precast concrete foundation whose lower part is supported by a cast-in-place concrete until the concrete hardens. CONSTITUTION:A perpendicularity maintaining jig A is formed of a maintaining section 1 fitting on the upper end of a foundation B and a leg body sectin 10 extending downward on right and left sides from the maintaining section 1. The maintaining section 1 is fixed to an anchor bolt 44 protruding on the upper face 40 of the foundation B. The upper face of the maintaining section 1 is provided with a level 6 to indicate the angle of the upper face of the foundation B. The leg body section 10 is extensible, and the length of the right and left leg body sections 10 is adjusted with watch on the level 6 in a state where the maintaining section 1 is fixed to the upper end of the foundation B to keep the foundation B perpendicular.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a site where a precast concrete (PC) foundation previously formed in a factory or the like is installed on a construction site such as a house by supporting the lower part with cast-in-place concrete. A vertical holding jig for a precast concrete foundation for holding the foundation vertically until the poured concrete hardens.

[0002]

2. Description of the Related Art As is well known, the foundation of a house is generally formed by pouring concrete on site, and therefore its construction is root cutting on the ground and crushing stone on the root cutting. Formation of groundwork by laying down and rolling etc., building of formwork, placing concrete, dismantling formwork,
This is done by performing backfilling and mortar top-leveling in order. Furthermore, in the case of foundations with fuchin parts, concrete is placed in the fuchin parts after paving with crushed stone, and when reinforcing bars are to be installed in the foundation, the reinforcement is arranged prior to assembling the formwork. Work is done. After the concrete is placed, it is also necessary to position and attach anchor bolts for fastening and fixing the foundation as the upper structure to the foundation.

Therefore, in the basic construction procedure as described above, it is difficult to reduce the construction period and the construction cost because a large number of man-hours are required for the work, and the earthwork,
It requires skilled workers such as rebar and form carpenters. Therefore, in recent years, a method for constructing a foundation for a house or the like has been performed as a PC-made foundation building block structure in which a foundation for a house is preliminarily formed in a factory or the like in order to save labor on site such as a prefabricated house. There are cases where it will be.

In the foundation construction block structure, for example, a foundation fuchin portion to be placed on a foundation and a rising portion to be mounted on the foundation fuchin portion and on which an upper structure such as a house is placed are previously prepared. It is formed integrally in a factory or the like. The block structure has a shape obtained by dividing the conventional cast-in-place foundation perpendicularly to its longitudinal direction. Further, the foundation is one in which a ground work is provided in the same manner as when the foundation is constructed with cast-in-place concrete, and concrete is discarded and poured on the ground work.

However, the block structure as described above has some problems. For example, when installing a block structure on a construction site, it is difficult to adjust the horizontal level of each block structure, and a cross-section T is required for transportation.
Since it is in the shape of a letter, it is difficult to stack and is bulky, and since it is heavy, it takes time to load and unload trucks.

However, only the rising part of the foundation is connected to the PC.
It is possible to solve the above-mentioned problem by making the base fuchin part made of cast-in-place concrete. By making only the base upright from PC, the PC base can be formed into a rectangular plate shape without being bulky.
The weight of the PC part is light because it is only the foundation upright part.
In addition, the horizontal level of the basal can be adjusted in forming the basal footin.

[0007]

By the way, in the PC foundation in which only the foundation upright is made of PC, when the construction is performed, the PC foundation portion is vertical until the foundation footing portion of the cast-in-place concrete is hardened. It is necessary to hold it upright. Therefore, at the construction site, using a suitable member as a sticker, the PC is made from both sides of the PC foundation.
I tried to support the foundation. But like this,
It is unstable to simply support the foundations with the sticks from both sides of the foundation.
There was a possibility that the C foundation would tilt. Further, when the PC foundation is made to be vertical, it is difficult to make the PC to be vertical with high accuracy in a state of being supported by the sticking bar.

From the above, there has been a demand for a jig for easily and accurately holding the PC foundation vertically until the foundation footing of the cast-in-place concrete is hardened. The present invention has been made in view of the above circumstances, and it is an object of the present invention to construct a foundation in which a lower portion of a PC foundation is supported by cast-in-place concrete until the portion of the cast-in-place concrete is hardened. (EN) It is an object to provide a vertical holding jig for a precast concrete foundation that can easily and accurately hold the foundation vertically.

[0009]

In order to solve the above-mentioned problems, the present invention provides a holding portion fitted to the upper end portion of a foundation, and a rod-shaped leg that extends from the holding portion to the left and right downwards and is extendable. The holding portion comprises a body portion, and the holding portion has a rectangular flat plate whose lower surface abuts on the upper surface of the base, and a holding member which projects downward from both left and right ends of the flat plate and which holds the base from both left and right side surfaces. The flat plate is provided with an insertion hole for inserting an anchor bolt protruding perpendicularly to the upper surface of the base, and a spirit level for checking the angle of the upper surface of the base is provided on the upper surface. It is a thing.

[0010]

According to the above construction, when constructing the foundation, first, the PC foundation is installed at the construction site, and the cast-in-place concrete is cast around the lower part thereof to support the PC foundation. In this state, the anchor bolt of the PC foundation is inserted through the insertion hole of the flat plate of the vertical holding jig, and the holding portion is fitted to the upper end of the foundation so that the holding member holds both side surfaces of the PC foundation. Then, the left and right leg portions are extended so that the tips of the leg portions come into contact with the ground. At this time, while looking at the level provided on the upper surface of the flat plate, adjust the lengths of the left and right leg portions so that the upper surface of the foundation becomes horizontal. Until the cast-in-place concrete hardens, hold the PC foundation vertically with the vertical holding jig in this state.
The vertical holding jig is removed from the PC foundation when the cast-in-place concrete has hardened.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are drawings showing an embodiment of the present invention, in which a vertical holding jig A for a PC base of this embodiment is fitted to an upper portion of a PC base B as shown in FIG. The holding unit 1 and the rod-shaped leg unit 10 that extends from the holding unit 1 to the lower left and right sides and is expandable and contractible are mainly configured.

Before explaining the vertical holding jig A of this embodiment, the PC base B used in this embodiment will be described. PC base B used in this embodiment
Is, in advance, along the longitudinal direction of the foundation to be constructed, on the bottom surface of the root cutting hole C struck by the construction site, as shown in FIG.
It is adapted to be supported by a plurality of foundation support parts D arranged at a predetermined interval.

The base support portion D has a bottom surface 20 of the root cutting hole C.
As shown in FIG. 1 and the like, the rectangular bottom plate portion 30 and the left and right sides of the bottom plate portion 30 are placed on the upper portion in a row along the longitudinal direction of the foundation to be constructed. On the edge,
Side wall part 3 standing upright along the longitudinal direction of the foundation to be constructed
1 and 31 and a pair of protrusions 32 and 32 provided on the bottom plate portion 30 at a predetermined interval. The bottom plate portion 30, the side wall portions 31, 31, and the protruding portion 3
The base support part D consisting of 2, 32 is a P formed integrally.
It is made of C.

The PC-made foundation B serves as a rising portion of a PC-made foundation that has been preformed in a factory or the like, instead of the rising portion of the conventional cast-in-place concrete foundation. When the PC base B is used as a continuous base such as a cloth base, a plurality of PC bases B ... Are provided on the root cutting hole C bottom surface 20 via the base support portion D.
It is designed to be installed in a row.

The PC-made foundation B is formed in a rectangular plate shape as shown in FIG. And PC made B
The upper surface 40 is formed at right angles to the left and right side surfaces 41, 41 of the PC base B. On the lower surface of the PC base B, fitting portions 42 ... Protruding from the lower surface are provided as shown in FIG. The fitting parts 42 are provided at intervals similar to the intervals of the base support parts D placed in a row, and the thickness thereof is substantially the same as the interval between the protrusions 32 of the base support part D. It is formed to a thickness. The fitting portions 42 ... Can be fitted between the protruding portions 32, 32.

Further, as shown in FIG. 3, the connecting end portion of the PC base B is provided with notches 43, 43 opening to the upper surface and the end surface of the PC base. And PC made B
Reinforcing bars 45 ... Are arranged inside the. Then, a part of these reinforcing bars 45 is exposed at a joint portion between the PC bases B and a joint portion between the PC base B and the foundation footin portion (not shown), and mortar or concrete is placed on the portion. In doing so, it is designed to strengthen the bond. An anchor bolt 44 for joining the foundation and a wall is provided on the upper surface 40 of the PC foundation B so as to vertically project.

Next, the vertical holding jig A of this embodiment will be described. The vertical holding jig A is mainly composed of the holding portion 1 and the leg portion 10 as described above. As shown in FIG. 1, the holding portion 1 is composed of a flat plate 2 whose lower surface abuts on the PC base upper surface, and holding members 3 and 3 which project downward from both ends of the flat plate 2. That is, the holding portion 1 is formed by bending both ends of a rectangular metal plate at a right angle to have a U-shaped cross section. The width of the flat plate 2 of the holding portion 1 is slightly different from the upper surface 4 of the PC base B.
It is longer than the width of 0.
With both side surfaces 41, 41 of the upper end portion of the foundation B being sandwiched,
It is adapted to fit on the upper end of the PC base B. Further, the flat plate 2 of the holding portion 1 fitted to the upper end of the PC base B is in close contact with the upper surface 40 of the PC base B, and the upper surface of the PC base B and the upper surface of the flat plate 1 are It is supposed to be parallel.

Further, an insertion hole (not shown) having a diameter slightly larger than that of the anchor bolt 44 is provided in the central portion of the flat plate 1.
Is provided, and by inserting the anchor bolt 44 on the upper surface of the PC base B into this insertion hole, the PC base B
The holding portion 1 can be fixed to the upper end portion. An anchor fixing portion 4 is provided on the upper surface of the holding portion 1. The anchor fixing portion 4 is formed in a U-shaped cross section in a shape substantially similar to the holding portion 1 formed in a U shape by the flat plate 2 and the holding members 3 and 3, and the length thereof is the holding portion 1.
It is formed in about half.

The anchor fixing portion 4 has its both side surfaces flush with the outer surfaces of the holding portions 3 and 3 and the flat plate 2
Both ends thereof are welded onto the flat plate 2 so as to cover from the end portion of the upper surface of the to the substantially center. Further, the anchor fixing portion 4 is also provided with an insertion hole (not shown) for the anchor bolt 44. That is, the anchor bolt 44 penetrates the holding portion 1 and the anchor fixing portion 4. The anchor fixing portion 4 allows the flat plate 2 of the holding portion 1 to be fitted to the upper end portion of the PC base B in a state of being substantially perpendicular to the anchor bolt 44.

Further, the nut 4 is attached to the upper end of the anchor bolt 44 penetrating from the insertion hole (not shown) of the anchor fixing portion 4.
By screwing 5 together, the holding portion 1 is fixed to the anchor bolt 4
It is designed to be fixed at 4. A level 6 is provided in a portion of the flat plate 2 of the holding portion 1 which is not covered by the anchor fixing portion 4. This level is well known and, as shown in FIG. 2, is a transparent tube 7 containing one colored liquid and one bubble 8. The level 6 has two scales 7a, 7a attached to the center of the tube 7, and the bubble 7 is horizontal when there are bubbles 8 between the two scales 7a, 7a. Is shown.

The tube 7 of the level 6 is a flat plate 2
A plate 2 which is perpendicular to the longitudinal direction of the PC base B
It is installed parallel to the upper surface of. The cover 9 is fixed to the upper surface of the flat plate 2 so as to cover both sides thereof. Then, on the outer surface side of the left and right holding members 3, 3,
Projecting pieces 5 and 5 for connecting the leg portions 10 are provided respectively.

As shown in FIG. 2, the two leg portions 10 are provided with projecting pieces 5 and 5 each having one end projecting to the outer surface side of the two holding members 3 and 3 of the holding portion 1, respectively. It is pin-coupled and is connected to the holding portion 1 so that the leg portion 10 can rotate in a plane perpendicular to the length direction of the PC base. As shown in FIG. 1, each leg 10 includes two round bar-shaped steel materials 11 and 12 and a cylindrical connecting member 13 that connects the steel materials 11 and 12. A threaded portion 14 is provided on the outer circumference of each of the end portions of the two steel materials 11 and 12 on the connection side. The inner peripheral surface of the connecting member 13 is formed as a screw hole (not shown), and the steel members 11 and 12 are inserted from both ends of the connecting member 13, respectively.
The two steel materials 11 and 12 are connected by screwing the end portions of the two. The threads of the screw holes of the connecting member 13 are formed in opposite directions at both ends of the connecting member 13. Further, the connection side end portions of the two steel materials 11 and 12 are also formed with screws in mutually opposite directions.

Therefore, when the two steel materials 11 and 12 are screwed to both ends of the connecting member 13 and the steel materials 11 and 12 are fixed so as not to rotate, the connecting member 13 is rotated to the left and right. The screws of the steel materials 11 and 12 are tightened at the same time or loosened at the same time, so that the leg portion 10 expands and contracts. And two steel materials 11, 1
One end of one of the two steel materials 11 is connected to the holding portion, and one end of the other steel material 12 is connected to a substantially square receiving plate 15 that receives the ground. The method of connecting the receiving plate 15 and the steel material 12 is also the same as the holding portion 1 and the steel material 11.
The steel material 12 is rotatably connected to the receiving plate 15 in a plane perpendicular to the length direction of the PC base B in the same manner as in the connection method.

At the center of the connecting member 13, the connecting member 1
A through hole 16 is provided at a right angle to the screw hole of No. 3. By inserting a rod (not shown) into the through hole 16 and rotating the connecting member 13 left and right around the central axis of the screw hole by using the rod as a handle, the connecting member 13 is screwed as described above. The combined steel materials 11 and 12 can be expanded and contracted.

Further, in this embodiment, as shown in FIG. 4, an auxiliary vertical holding jig E for auxiliary holding the vertical of the PC base B is provided in a portion of the PC base B where the anchor bolts 44 are not provided. It is used. This auxiliary vertical holding jig E
As shown in FIG. 4, a locking portion 50 having an inverted L-shaped cross section,
The leg portion 51 extends obliquely downward from the locking portion 50. The locking portion 50 is formed by bending a rectangular metal plate at a substantially central portion thereof at a right angle. And
A rubber 51 is attached to the inside of the locking portion 50 so as to prevent slipping. The rubber 51 may be synthetic resin, synthetic rubber, natural rubber or the like as long as it has a high coefficient of friction. In this embodiment, synthetic rubber is used.

The leg portion 51 has the same structure as the leg portion 10 of the vertical holding jig A, and the connecting portion between the locking portion 50 and the leg portion 51 is the holding portion 1 and the leg portion 10. It has the same structure as the connection part. With such a configuration, the auxiliary vertical holding jig E supports the PC base B from one side in a state in which the locking portion 50 is locked to the corner of the upper end of the PC base B. ..

Next, a method of constructing a foundation using the vertical holding jig A of this embodiment will be described. At the construction site, first, similarly to the conventional block structure for foundation construction, a root cutting hole C is first provided, and a ground work is formed on the bottom portion 20 thereof. Empty kneading mortar, floor mortar, etc. are thrown away at the portion where the base support portion D is placed on the bottom surface 20 of the root cutting hole C. In addition, the position where the base support part D is placed at this time is a position where the positions of the protrusions 32, 32 of the base support part D correspond to the position of the fitting part 42 of the PC base B to be installed. That is, the base support parts D are installed at intervals corresponding to the intervals of the fitting parts 42 of the PC base B. Then, along the root cutting hole C, the base support portions D are installed in a line at the position where the mortar has been discarded. At this time, the horizontal level of the base support part 1 is adjusted before the mortar is hardened.

Then, as shown in FIG. 3, the foundation support portion D
The positions of the fitting portions 42 of the PC base B are aligned between the protruding portions 32, 32 protruding above the bottom plate portion 30, and the fitting portions 42 ... Fit it in between and install the PC base B. In this state, the vertical holding jig A is attached to the PC base B. First, the anchor bolt 44 is passed through the insertion hole of the flat plate 2 of the holding portion 1 and the insertion hole of the anchor fixing portion 4, and the holding members 3 and 3 of the holding portion 1 sandwich both side surfaces of the PC base B. like,
The holder 1 is fitted to the upper end of the PC base B. Then, the nut 45 is screwed onto the tip of the anchor bolt 44 protruding through the anchor fixing portion 4 and tightened, whereby the holding portion 1 is completely fixed to the PC base B.

Next, the two leg portions 10 are spread to the left and right, and the connecting member 13 is rotated to extend the leg portions 10, so that the receiving plate 15 at the tip of the leg portions 10 contacts the slope 21 of the root cutting hole C. Make contact. Then, the flat plate 2 of the holding unit 1
While looking at the level 6 on the upper surface, the lengths of the left and right leg portions 10 are adjusted so that the upper surface of the PC base B becomes horizontal, and the left and right legs 10 are extended by extending the PC base B. So that the PC foundation B does not tilt to the left or right. Note that FIG. 3 illustrates a state in which only one vertical holding jig A is installed.

Next, the anchor bolt 44 of the base B made of PC
The auxiliary vertical holding jig E is attached to a portion without the above.
The locking portion 50 is locked at one corner of the upper end of the base B made of PC, and the leg portion 51 is extended so that the tip of the leg portion 51 abuts the slope 21 of the root cutting hole C. Next, in the same manner, another auxiliary vertical holding jig E is locked to the other corner of the upper end of the PC base B and installed in the same manner as the auxiliary vertical holding jig E. When these auxiliary vertical holding jigs E are attached, since the angle of the PC base B is determined by the vertical holding jigs A, the leg portions 51 of the auxiliary vertical holding jigs E are extended too much, Be careful not to incline the foundation B.

Next, between the base support portions D, along the outer surfaces of the side wall portions 31, 31 of the base support portions D, the side wall portions are provided on the left and right root cutting holes C bottom surface 20 of the PC base B, respectively. Three
A mold (not shown) having the same height as 1, 31 is built. Then, between the molds, concrete is formed to form the foundation fuchin portion up to the height of the side wall portions 31, 31. At this time, the formwork is also built in the part that will be the end of the cloth foundation.

Next, both side surfaces of the connecting portion of the PC base B are covered with a mold, and grout material such as mortar is cast in the notch 45 of the connecting portion. Then, the vertical holding jig A and the auxiliary vertical holding jig E are removed from the PC-made foundation B when the concrete in the foundation footing portion has hardened. And root cutting hole C
Backfill and start building the house on the foundation as before.

As described above, according to the vertical holding jig A of this embodiment, while the holding portion 1 is easily fixed to the upper end of the PC base B, the leg body portion 10 is used until the foundation footin portion is hardened. , It is possible to hold the PC base B. Further, by adjusting the length of the leg portion 10 while confirming the angle of the upper surface of the PC base B by the level 6 provided in the holding portion 1, the PC base B can be vertically vertically and easily adjusted. Can be

The vertical holding jig A of the present invention is not limited to the above-mentioned embodiment, and the specific constitutional requirements such as the shape, size, and material of each member can be appropriately changed in practice. For example, the anchor fixing portion 4 may be omitted and the holding portion 1 may be directly fixed by a nut. Further, rubber is attached to the back surfaces of the flat plate 2 and the sandwiching plates 3 and 3 of the holding unit 1 to fix the vertical holding jig A in the same manner as the auxiliary vertical holding jig E. You may use it for the part that does not exist.

Furthermore, the foundation vertical holding jig is not limited to the method of constructing the foundation of the above-described embodiment. For example, the foundation B made of PC is directly cut without using the foundation support portion D. It goes without saying that the method can be applied to the construction method in which the foundation fuchin portion is placed on the bottom surface 20 of the hole C and the lower portion thereof is formed by cast-in-place concrete.

[0036]

As described above in detail, according to the vertical holding jig of the present invention, the holding portion can be easily fixed to the upper part of the foundation, and the leg portion extending from the holding portion can be used. Supporting the PC foundation The PC foundation can be supported until the cast-in-place concrete hardens. Also,
By adjusting the length of the leg while observing the level on the holder, the PC foundation can be made vertical with ease and high accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a vertical holding jig of the above embodiment.

FIG. 2 is a plan view showing the vertical holding jig.

FIG. 3 is a PC vertically held by the vertical holding jig.
It is a perspective view which shows a manufacturing base.

FIG. 4 is a sectional view showing an auxiliary vertical holding jig of the above embodiment.

[Explanation of symbols]

 A Vertical jig for precast concrete foundation B PC foundation (precast concrete foundation) 1 Holding part 2 Flat plate 3 Clamping member 6 Level 10 Leg part 44 Anchor bolt

Claims (1)

[Claims] 1. A vertical holding fixture for a precast concrete foundation that holds the foundation vertically until it hardens in the construction of a foundation that supports the lower part of a rectangular plate-shaped precast concrete foundation by means of cast-in-place concrete. A holder, which is fitted to the upper end portion of the foundation, and a rod-shaped leg portion that extends from the holding portion to the lower left and right sides and is expandable and contractible. Is formed in a U-shape in cross section by a rectangular flat plate that comes into contact with the flat plate and a sandwiching member that projects downward from the left and right ends of the flat plate and sandwiches the base from both left and right side faces. Is provided with an insertion hole through which an anchor bolt to be inserted is provided, and a level for checking the angle of the upper surface of the foundation is provided on the upper surface thereof. Vertical holding jig of the door concrete foundation.