JPH0412111Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention relates to independent concrete foundations for buildings, and in particular to precast concrete foundations with improved connection to connecting beams (underground beams). be.

BACKGROUND OF THE INVENTION Traditionally, conventional concrete foundations have been constructed of cast-in-place concrete with tie beams and, if necessary, a base plate. In other words, roots are cut from the ground surface, concrete is laid, forms are erected, reinforcing bars are placed, and concrete is poured at the same time as the connecting beams and base. After the concrete has hardened, the formwork is removed and backfilled to proceed with the upward process.

On the other hand, in current concrete construction, precast concrete is used as much as possible for each major structural part to obtain the benefits of prefabrication, and the efficiency of formwork is increased by standardizing parts, and specific Efficiency is improved by improving precision at the manufacturing site and by increasing the familiarity of workers. Generally speaking, the biggest advantage is said to be shortening the construction period. All the processes from installation at the construction site, assembly, and delivery for connection are carried out on parallel schedules with other processes, so the overall construction period is shortened. greatly contributes to Materials are brought in in the form of products, so there is virtually no difference, and the need for lifting facilities for large and heavy concrete members will be absorbed by the trend toward mechanization of construction work.

However, the design conditions for each foundation are different.
Mainly because it is not compatible with prefabrication in terms of standardization, concrete foundations are not often made into precast concrete blocks, and concrete foundations are not often made into precast concrete blocks. , has not been adopted for anything other than relatively light structures.

Problems that the invention aims to solve Problems when constructing a foundation with cast-in-place concrete mainly concern the arrangement of reinforcing bars and formwork. The foundation is the joint point of piles, columns, and connecting beams, and since the foundation's own reinforcing bars are added to this, it takes time to accurately arrange the reinforcement. When trying to solve these problems by precasting, it is necessary to solve the problem of connection and integration between the foundation and each member. These are all issues related to accurate installation and reinforcing steel connections, and are not limited to foundations, but all Pelecast concrete construction components. In other words, integration must be achieved between already hardened concrete or between existing concrete and post-cast concrete. For this reason, even under conditions where a large number of foundations of the same size are required, this connection means becomes an obstacle, and the use of prefabricated foundations is currently not promoted at all.

Means for Solving the Problems The present invention was developed in view of the above-mentioned current situation.
The main idea is to construct a concrete foundation using precast concrete with means for horizontal connections. In order to achieve this intention, reinforcing bars were installed to match the direction of the connecting beams, and upper and lower penetrations were installed in the center to connect the piles and columns using cast-in-place concrete. This completes the idea of a basic block body characterized by the provision of holes. This allows the foundation to be prefabricated as a block equipped with joining means.

Embodiment The precast concrete foundation block of the present invention will be explained based on the embodiment shown in the drawings.

In FIG. 1, numeral 1 indicates the entire foundation, and numeral 2 represents a block body for the foundation made of precast concrete. This block 2 is 1
It is formed into a roughly square shape as seen from the plane of the figure, and its diagonal line matches the direction of the connecting beam (underground beam) 3 connected to the block body 2 to form a diamond shape.
The corner portion is chamfered to match the width of the connecting beam 3 to form a joint surface 4. As shown in Figure 2, the height (thickness) of the block body 2 is made equal to the height of the connecting beam 3. This block body 2 has a circular hole in the center that passes through it vertically as a through hole 5, and the inner diameter of this hole is such that there is a distance of 10 cm from the outer circumference of the pile 6. It shows the column connected above and which will be supported by this foundation 1. Reference numeral 8 denotes a reinforcing bar for connecting the block body 2 and the connecting beam, which passes through the block body 2 horizontally, the inner end facing into the through hole 5, and the outer end extending and protruding from the joint surface 4. I have let you. 9 is concrete placed in the through hole 5 by post-casting.

The above configuration will be explained in more detail with reference to FIGS. 1, 2 and 3. Figure 2 1 is block body 2
FIG. 2 is a plan view of the lower part,
FIG. 3 shows a vertical sectional view, with symmetrical parts omitted in both cases.

The block body 2 has reinforcing steel bars 21 around the through hole 5.
Since it is a deformed annular body, it has main reinforcing bars 22 and pillars 23 on the upper and lower sides, and in addition to these, base reinforcing bars 24 of the foundation are arranged in a right angle direction to raise the outer end. Furthermore, four hanging hooks 25 are provided on the upper surface of the block body 2 for lifting the whole block.

Next, a plurality of concave grooves 51 are formed in the inner surface of the through hole 5 in the circumferential direction, and serve as key grooves for joining the post-cast concrete 9 and the block body 2. A connecting reinforcing bar 8 is provided with one end facing the through hole 5, and 81 is for connection with the upper end reinforcing bar 31 of the connecting beam 3;
82 is for connection with the lower end reinforcement 32, and the connecting reinforcement 8
The inner ends of 1 are connected via a connecting reinforcing bar 83 by a mechanical compression joint 84 using a sleeve, and the lower connecting reinforcing bar 82 is made into a through material by omitting the connection at the inner end. , are assembled on the same plane as the base reinforcement 24 described above.

Function The function of the basic block of the present invention will be explained step by step based on its construction method.

The foundation 1 is generally installed at a position cut off from the ground surface. Therefore, piles 6 are constructed on other board surfaces. Cast-in-place concrete piles are generally selected as the piles 6 due to the working environment, the height of the pile head is determined, and a required length of reinforcing bars 61 for connecting and anchoring are protruded above the piles, and the top surface of the piles is covered with base mortar 62. Finished horizontally and flatly. Next, the sacrificial concrete 11 supporting the lower surface of the block body 2 is completed together with Kuriishijiyo, the height of the upper surface is adjusted, and centering is performed.
It is best to complete the ground work 11 on the lower surface of the connecting beam 3 around this time.

Next, the block body 2 is hoisted up using the hoisting hook 25, and the reinforcing bars 61 of the piles 6 are inserted into the block body 2, and the block body 2 is hoisted down and installed. The through hole 5 has a margin for the outer diameter of the pile 6, and even if the pile 6 is slightly eccentric, it can be installed with high accuracy. Further, the lower connecting reinforcing bar 82 is positioned higher than the top surface of the pile 6, and it is only necessary to dodge the pile reinforcing bar 61 during installation. Next, the reinforcing bars 71 of the pillars 7 are assembled into the through holes 5.
Built on pile 6 inside. The connecting reinforcing bars 81 and the inner connecting reinforcing bars 83 are connected after the column reinforcements 71 are erected, and the upper and lower main reinforcing bars 31, 32 of the connecting beam 3 are connected to the outer ends of the connecting reinforcing bars 81, 82 on the outside. This joining is performed by inserting the sleeve 84 and mechanical compression.

The reinforcing bars 71 of the columns 7 have base plates at their lower ends and are installed on the mortar 62, and anchoring to the piles is done by the pile reinforcing bars 61 through post-cast concrete 9.

When the connecting beam 3 having a high height has an abdominal muscle 33, an insert 34 is buried in the joint surface 4 of the block body 2 in advance, and the end of the abdominal muscle 33 is inserted and fixed. The reinforcing bars of the connecting beam 3 are assembled in advance, and after the upper and lower reinforcing bars 31 and 32 are connected by sleeves 84, concrete is poured.

When the pillar 7 is of steel construction, only the pillar base is built on the pile 6, and the block body 2 is inserted through the through hole 5 in the same manner as described above.

As described above, the pile 6 and the column 7 are connected by the cast-in-place concrete 9, and are also integrated with the block body 2 at the same time, and the concrete 9 in the groove 51 forms a shear key.

The main reinforcing bars 31 and 32 of the connecting beam 3 are connected by the connecting reinforcing bars 8 through the block body 2, so that the precision of the reinforcement arrangement is perfect, and the pile reinforcing bars 61 and the column reinforcing bars 7
There is no confusion with 1.

Since the block body 2 is formed into a diamond shape with the oblique side connecting the joint surfaces 4, 4, the weight of the block body 2 can be reduced by cutting off the triangular part on the outside (Fig. 2, 1).

Effects of the invention The block body of the invention is constructed as described above,
Since it is used for construction, the advantages of prefabrication, in which the block body is made of precast concrete, are fully utilized, and the cost and accuracy of the formwork can be ensured, while at the same time the construction period is shortened. Additionally, since a through hole is formed in the center, the connection problems associated with prefabrication are also solved by pouring concrete into this area. This arrangement of through-holes is also advantageous not only for the precision of installation of large blocks of pyrecast concrete, but also, together with the diamond-shaped formation, reduces the overall weight, and the lifting equipment for this does not need to be particularly large. This through-hole area requires a relatively small amount of cast-in-place concrete, separate from the block body.
This concrete can be cast at the same time as the connecting beams, so no separate setup is required.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 shows the entire foundation, where FIG. 1 is a plan view and FIG. 2 is a sectional view.
Figures 2 and 3 are detailed diagrams of the block body.
2. FIGS. 1 and 2 are top and bottom plan views, respectively, and FIG. 3 is a sectional view. 1...Foundation, 2...Block body, 3...Connection beam, 4...Joint surface, 5...Through hole, 6...Pile, 7
... Column, 8 ... Connection reinforcing bar, 9 ... Post-cast concrete, 21 ... Reinforcement bar, 25 ... Hanging hook,
51... Key groove, 61... Pile reinforcing bar, 71... Column reinforcing bar, 84... Mechanical joint.

Claims (1)

[Scope of utility model registration request] A foundation block body made of precast concrete, which has a generally square plane with the direction of the orthogonal connecting beams being the diagonal direction, and the joint surfaces with the connecting beams being chamfered at the corners; It has the same height as the connecting beam, and a circular through hole for columns and piles is provided in the center of the plane, and a key groove for concrete pouring is installed in the circumferential direction on the inner surface of this through hole. Horizontal connecting reinforcing bars formed in multiple stages, with one end facing the through hole and the other end extending outward for connecting the connecting beam;
A precast concrete foundation block characterized by having reinforcing reinforcing bars for the block body.