CA1077281A - Pre-fabricated architectural footing block - Google Patents

Abstract

Inventor Tadayasu HIGUCHI
Title of the Invention Pre-fabricated Architectural Footing Block Abstract of the Disclosure A pre-fabricated architectural concrete footing block consisting of a base slab and a ridge having an inverted T-shaped traverse cross section wherein a plurality of bores are provided in the base slab so that mortar is poured therein so as to reach the rubble and gravel bed thereunder.
The block is securely anchored to the bed and is not easily displaced during the construction work.

Description

~0772~1 Back~round of the Invention This invention relates to an improved pre-fabricated architectural footing block.
The footing for 'houses is conventionally prepared by digging trenches in accordance with t'he layout of the house, forming frameworks for t'he footing in t'he trenches, and pouring mortar in the space formed by t'he frames so as to form a continuous footing. Recently, pre-fabricated footing ; blocks 'have come into use. First, rubble is placed in t'he ' 10 bottom of t'he trenc'hes, gravel is spread t'hereover, and ' blocks are placed properly aligned t'hereupon. The footing ' block is usually a long concrete block consisting of a base slab and a ridge 'having a traverse cross section of inverted T s'hape. A footing block t'he ridge of w'hich is not a solid body but is an iron bridge-like structure wit'h two end walls, ~' a solid web top girder and a plurality of slanting strut wall8 is known, too.
Usually, t'he bloGks are placed on t'he rubble and gravel bed in t'he trenc'hes, thereafter t'he bed is compacted by a vibration compacter, for instance, additional gravel being optionally supplied, so t'hat t'he lines of blocks are leveled.
'' T'hereafter, the space between t'he blocks and t'he sides of t'he trenc'hes is filled with eart'h.
However, t'hese footing blocks are not always quite satis-factory in use. A plurality of blocks are simply put on t'he ~'' bed and are arranged in a line, and t'hey are not secured to t'he bed. The bottom of the block must be flat. Because compacting and supplying additional gravel are carried out after the blocks are placed on the bed and it is not convenient for 3 t'he block to have any anchor means such as protrusions at the ~07~Z~i bottom thereof. Therefore, they are easily displaced by accident No effective means for anc'horing the blocks to the bed has been known.
In order to eliminate this disadvantage of t'he con-ventional footing block, I have made various attempts. I
made a block which is provided wit'h a tenon at one end and a mortice at t'he other end so that a plurality of t'he same blocks can be aligned by engaging t'he tenon and mortice.
; But it increased manufacturing cost and it was not so con-venient to prepare t'he continuous footing using this block.
Also I made a block wit'h anchor bolts at t'he bottom thereof.
But the bolts impaired the compacting of t'he bed and leveling of t'he blocks.
T'his invention provides an improved pre-fabricated arc'hitectural footing block whic'h can be secured to the bed wit'hout incurring t'he above-mentioned disadvantages.
Summar~ of t'he Invention In accordance wit'h t'his invention, t'here is provided an improved pre-fabricated arc'hitectural concrete footing block consisting of a base slab and a ridge 'having a traverse cross section of inverted T s'hape w'herein a plurality of bores are provided in t'he base slab so t'hat mortar is poured t'herein . 80 as to reac'h t'he bed.
T'he bore may be simply cylindrical, may be inclined toward t'he center of the bottom of the slab, may 'have a conical en-largement at t'he bottom, or may b'e conically widening toward t'he bottom.
Now the invention is explained in detail with reference to t'he attached drawin~s.
3 Brief Descripti_n of t'he Drawin~s Fig. 1 is a perspective view of an embodiment of this invention. Fig. 2 is a traverse cross-sectional view of the block of Fig. 1, which is placed on the bed on a trench.
Fig. 3 is a traverse cross-sectional view representing two other embodiments of this invention. Fig. 4 is a perspective view of another embodiment of this invention.
I Detailed DescriPtion of the Invention The pre-fabricated architectural footing block of this invention can be manufactured in manufacturing plants by the conventional technique using known concrete material. Usu-~ ally iron reinforcing bars (not shown) are incorporated in`~l the blocks. The characteristic of this invention resides in ; the fact that the block is provided with bores in the base ~' slab.
1~ In t'he embodiment represented by Figs. 1, 2 and 3, t'he blook 1 consists of a base slab 3 and a ridge 2, and has an .~
inverted T shaped traverse cross section. Also. two or more ~'~ bolts 8 for securing the upper structure thereto are planted ~; ~' in the ridge. A plurality of bores 4 extend from the foot ,~, ~
l~ 20 of the ridge to the center of the bottom. A typical block is 95 cm in lengt'h, 67 cm in height, and 30 cm in bottom width, ~he thiokness of the base slab is 15 cm and the helg'ht and width of the ridge are respectively 52 cm and 18 cm.
'~ ~ Four bores are provided alternatively from one side and from the other side of the ridge toward the bottom center. Theo- '-retically two bores are minimum. But practically, four bores :
' are preferably provided. More than four bores may be provided.
Fig. 2 shows the block of Fig. 1 placed on the bed in a trench. The trench is s'hown as 10, rubble 12 is placed in the : .
~30 bottom of the trenc'h and gravel 13 is spread thereon. On the ., ~ '` .

. . .

'';, : : ' . ,, .' ~ .
~ . -~077Z81 gravel, blocks 1 are placed. The bed is compacted and additional gravel is supplied for leveling in accordance with the conventional procedures. After that, thin mortar is poured into the bores so t'hat it permeates into the gravel and rubble. Thus the blocks are anchored to the bed and they are not easily displaced in the course of ' filling of t'he side space 11 and construction of t'he upper structure.
~ig. 3 represents two other embodiments of this invention.
The bore 4 may be conically widening toward the bottom as shown on t'he rig'ht side. Or else, the bore may be a vertical cylin-der wit'h a conical enlargement at the bottom as shown on t'he left side. T'hese two embodiments are especially preferred and give good stability to the block.
Fig. 4 represents another embodiment of t'his invention.
, In t'his embodiment, the ridge is not eolid but comprises two end walls 5, a top solid web girder 6 and a plurality of slanting strut walls 7. This is larger in size and typically is 290 cm , in length. T'he other dimensions are the same as those of t'he embodiments of Fig. 1, etc. This block per se is known. But the base slab of this block is provided wit'h a plurality of bores according to this invention. In Fig. 1, bores are pro-vided in the base slab along t'he longitudinal center line t'hereof between the strut walls. But the bores may be provided inclined and in a zigzag pattern as shown in Fig. 1 and 2.
Also t'he bore may be a simple vertical cylinder, may 'have a conical enlargement at the bottom, or may be conically widening toward t'he bottom as shown in Fig. 3. ,, ~' .

.
,.

Claims (5)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. An architectural concrete footing block which com-prises a base slab and a ridge having an inverted T-shaped traverse cross-section and is provided with at least two bores in the base slab, wherein the ridge comprises two end walls, a top girder and a plurality of slanting strut walls.

2. The footing block as claimed in Claim 1, wherein each of the bores is provided between the two strut walls.

3. The footing block as claimed in Claim 2, wherein the bore is conically widening toward the bottom.

4. The footing block as claimed in Claim 3, wherein the bore is cylindrical with a conical enlargement at the bottom.

5. The footing block as claimed in Claim 1, wherein the bores are arranged in a zigzag pattern.