JPS5822609B2 - How to build a tank foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for constructing a foundation that has sufficient support capacity and is resistant to uneven settlement when constructing a foundation for a tank.

In the case of conventional tanks, the construction method was to lay a sand mat on top of the ground that had been strengthened in advance by driving sand piles, and then build the tank on top of it, but with this method it was difficult and difficult to strengthen the ground uniformly. This causes equal subsidence.

In addition, as a solution to these shortcomings, concrete
There is a method of driving ready-made piles such as floor slabs and combining the pile heads with reinforced concrete floor slabs, but this method is not common in terms of construction efficiency and economy.

In view of the shortcomings of the conventional methods, the present invention provides a structure that is resistant to slippage, lateral flow, and uneven settlement earthquake resistance by integrally forming both the slab and the slab from the same material. In addition, the deck slab and pile cap will be able to obtain a sufficiently large supporting force to support the superstructure.The details are explained below with reference to the drawings.

First, as shown in Fig. 1, drive machine A into the desired ground 1.
An appropriate number of compaction piles 2 are constructed using a hollow pipe B having a diameter of 100 mm, using materials such as sand and cement, water slag and cement, ore slag and cement.

At this time, the ground 1 is laterally consolidated by compaction, and especially in soft ground, the material forming the piles 2 absorbs ground water to strengthen dewatering.

On the other hand, the pile 2 absorbs moisture in the ground, causes a hydration reaction, and hardens.

If there is not enough ground water, just add an appropriate amount of water when adding the material.

Next, after waiting for the pile 2 to harden, as shown in FIG. 2, the surface layer of the ground 10 is excavated to expose the pile head 3, and the pile head 3 is cleaned.

Thereafter, as shown in FIG. 3, the excavated area is filled with the same material used for the piles, and the filled material is sufficiently compacted or compacted using a tamper or roller while being sprinkled with water.

This process is repeated over several layers to form the floor slab 4.

Finally, as shown in FIG. 4, after waiting for the floor slab 4 to harden, the tank body 5 is constructed.

The tank foundation constructed in this manner has extremely small residual settlement on suitable ground even without carrying out a loading test such as filling with water.

In addition, the floor slab 4 must be sufficiently compacted and finished to have a thick wall in multiple layers, so irregular stress movement due to movement of liquid in the tank 5 is uniformly distributed to the ground 1, preventing uneven settlement. Because it is highly watertight, it can prevent the ground from becoming fluid due to liquid leakage, which is the case with conventional tank mounds.

Furthermore, in addition to the first-stage foundation, by forming only the piles 2 in the periphery as shown in Fig. 4, resistance against slippage and lateral flow can be further increased.

In addition, the 28-day strength of the piles, floor slabs, etc. used in the method of the present invention is 4
0~50K? The formulation for /crA is as shown in the table below.

The maximum particle size of the materials used here was sand 15 m/m, blast furnace ballast 2077Z/7nz electric furnace ballast 2Q m/m.

The blast furnace water slag is 5 m/m, and the converter granule slag is 2.5 m/m.

or. Depending on the application, lime or the like may be used as a substitute for cement depending on the strength of the mixture or the material used.

As described above, the present invention integrates piles and slabs made of hardened materials mainly composed of fallen sand, water slag, ore slag and cement, and is integrated with the slab by integrating the piles and the slab. As a group of piles, it has resistance against slipping and lateral flow that cannot be obtained by a single pile, and also has a ground strengthening effect due to lateral consolidation and dewatering of the pile, and uneven settlement due to even load distribution due to thick slabs. It has both a preventive effect and an increase in earthquake resistance, and in addition, by forming only antibodies in the surrounding area, the resistance against slipping and lateral flow is further enhanced.

The tank foundation constructed in this way will not cause residual settlement on suitable ground even without carrying out a loading test such as filling with water.
Since it is extremely small and does not require compensation for uneven settlement, the construction period is shortened, making trenches an economical construction method.

Furthermore, it goes without saying that the construction method of the present invention can be applied not only to tanks but also as the foundation of other structures within the scope of the patent.

[Brief explanation of the drawing]

1 to 4 are longitudinal sectional views showing each step of the present invention. 1...Soil, 2...Compaction pile, 3.
... Pile head, 4 ... Floor slab, 5 ...
·tank.

Claims (1)

[Claims] 1. In constructing a tank foundation, materials consisting of sand, cement, water slag, cement, slag and cement, etc. are compacted into the ground of the tank shell or around the shell using a hollow tube equipped with a driving machine. Piles are created, the ground is then excavated to expose the pile heads, the material is filled between the exposed pile heads and compacted, and this filling and compaction is repeated over multiple layers to form the pile and slab as one unit. A tank foundation construction method characterized by: