JPS5988524A - Method and apparatus for prevention of liquefaction of sandy ground - Google Patents

Abstract

PURPOSE:To exactly improve the ground by constructing coagulated blocks in the surrounding ground of a building efficiently and at low cost by a method in which the sandy ground where a building is to be constructed is excavated by a water jet and then cement milk is injected into the holes excavated. CONSTITUTION:A vibro-hammer 7 is attached to the upper end of a body 1 consisting of inner and outer cylinders (a) and (b), and a three-way cock 4 leading to the space 2 formed by the inner and outer cylinders is provided to the body 1. The cock 4 is connected through pipes 5 and 6 to a pump (not illustrated) by which both high-pressure water and cement milk are injected. The body 1 is lifted up by a crane 11, and water jet is injected from discharge ports 13 through the hose 5 for high-pressure water of the three-way cock 4 and the vibro-hammer 7 is actuated. The device is slowly brought down to excavate from sandy ground 14 to clayey ground 15, and the cock 4 is switched to the hose 6 for cement milk to construct coagulated blocks in the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for preventing liquefaction of sandy ground.

Conventionally, reinforced concrete was poured into the ground of the construction site as shown in Figure 1.
1. Jl. Shiro, which is reinforced by placing a large number of piles at intervals, has a loose sandy ground with uniform grain sizes and has underground water, as seen in the Niigata earthquake of 1999. As mentioned above, during an earthquake, excessive water pressure was generated, the sandy ground liquefied and flowed, and the effect of reinforced concrete piles became effective, causing buildings to lean or collapse. Many areas of sandy ground are found throughout the country, and the current situation is such that there is an urgent need to find a way to prevent this.

In view of the problems mentioned above, the present invention prevents the sandy ground from liquefying and flowing. - Milk is poured into the hole 1 excavated in the sandy ground by jetting J-Targets 1. , the coagulation block is shown in Figures 2, 3 and 4! It was constructed in the ground around the building to prevent liquefaction of the sandy ground, and as a device to do this, a gap path was installed on the inner periphery of the two inner and outer sides. (''
, At the upper end of the cylinder, connect one side to the high-pressure water pump and the other side to the cement milk injector pump, communicating with this space passage, and remove the F, 7j, Thl tsuk.
-1 simple] One end has one discharge hole at intervals around the entire circumference.
By cutting the three sides of buC, it is possible to perform jetting of 0.1 and pouring of ment milk. l
i,! This is Shino who provides l1tl.

Now, an embodiment of the ground liquefaction prevention device of the present invention is shown in the drawings. ;2AriRepo is as above.

Figures 5 and 6 show an embodiment of the present invention between stations. In Figure C1, (1) is a square (■-shaped inner tube <A) and an outer tube (1).
J) is double installed () to form a spacing passage (2) on the inner peripheral edge. A large number of discharge holes (3
>(3>...(3) is the drilling.

(4) is a spacer passage (2) located at a suitable location on the upper end surface of the cylinder body (1).
Communicated with [! -4 A pipe (5) with one end connected to a high-pressure water pump (not shown) with a protruding three-way pipe (5), and the other
l! : It is largely connected to a pipe (6) connected to a pump for a milk injection machine (not shown).

(7) is a barb 1.1. Use a hammer to insert the handle (8) into the handle set on the upper end of the cylinder body (1).
There is a hook (9) protruding from the top of the hanger (7).

(10) is an air vent hole of the inner cylinder (A) which is stepped ( ) on the upper end surface of the cylinder body.

The shape of the cylinder body (1) can be cylindrical as shown in Figure 7 (a), or the lower end of the inner cylinder (a) can be shaped into a square ε11 or In some cases, it is formed in the shape of a circle ε1E.

In addition, (11) is a crane, (12) is a building, (13)
(14) is a solidified block, (14) is a sandy soil, (15) is a viscous pile, and (1G) is a reinforced concrete pile.

The device according to the present invention is as described in ``-''. Therefore, in order to use this device to improve the sandy ground of a construction site, first install the device protruding toward ``-'' as shown in Figure 8. Hang the tip of the crane (11) on the hook (9) to suspend the wooden structure, and then press the lever on the three sides (4). :A-Taj 1-
1 on the ground
? 7- < 7), apply vibration with As shown in Figure 10, Hori 1'ill) ° 1; After the γ attack, 37'j -I
・Turn the lever (4) and switch to the milk injection pump side. Discharge hole (3) (3
3)...(30 Inject mustard milk and 12th
I'i1 to accept the ground? Page 11: 1. “CL/Mentomilk 71 people 1) in the sandy soil 1:1 cylindrical ?
] Width U) I? Sada (J move tp T ?Ij bill
'l nl! Repeat the process as shown in Figure 13, and place the coagulating cock nY around the slit 1 [-,)'C.
ground f1) (inside structure ξi seven squares σ).

The present invention has less vibration and noise than the above-mentioned IC method (because excavation is carried out by jetting A-targes 1 to 11 while applying vibration with a hammer to pipe 1), and is more efficient in applying emulsion (8). Line (2) There is also 'C' in the drilled hole, and the milk is poured into the hole to solidify it, so it is positive + i [, Mf
It is indeed possible to construct a structure.
There are things that can be changed (the number of people and the depth of the hole), and the depth of the hole.
Part of the milk is soaked in the surrounding sand.
U If it solidifies, it becomes stronger.

Also, since the sand is removed when digging the trench, the amount of slime emitted is particularly important (91% due to the small amount of η), since the sand is removed without being pushed in when drilling the C hole. l!lsu1(
This allows you to save money.

1!11 Uruni The structure of the present invention is simple 4゛, and it can be assembled by collecting the existing B, and its length is, for example, IL, A11, and R1. Since it can be successfully converted into L7 Valley 1~, it is easy to handle by selecting the rise as appropriate according to the soil scale.

Father, when using the r method and device according to the present invention - 1'
(In a 6-tiered building, it can be easily applied in a narrow space.)
If the ground improvement can be done reliably, the construction can be carried out at low cost.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional Iζ construction method using reinforced concrete piles. Figure 2 shows an example of the wooden invention, and Figure 2 (C) shows an example of MI applied to a W-level building. Figure 3 is a tmi view showing the state in which the construction method of the wooden invention was constructed around an existing building. Figure 4 is a plan of the whole country. Figure 6115 is a cross-sectional top view of the device of Wood's invention. Figure 6 is a bottom view of the above. Fig. 7 shows an embodiment in which the shape of the cylinder body is changed throughout the entire area. Figs. 8 to 13 are process diagrams of the method of the present invention. Main body. <2) is the interval path. (C3) is a discharge hole. (4) is a three-way cock. (7) is one hammer on the pipe.

Claims (2)

[Claims] (1) A-Large 1 with 18 sandy areas on the construction site
Dig into the hole, and after completing the excavation, pour the milk into the drilled hole.
Is it possible to build a u-tsuku in the ground around a building on sandy soil? I:1
Liquefaction method for sandy ground that has been shown to prevent liquefaction of sandy ground. (2) Two cylinders on the inside and outside, 1 inch on the main body, 1 inch on the end.
Vibrator 1 with a protruding hook on the hook. Take the hammer (=
l GJ, η At the end of the main body, connect a 1h1 gap path between the inner and outer cylinders to connect the three sides. Connect j to the high-pressure water pump and connect it to the milk infusion machine pump,
The end face of the main body is equipped with 1!1 exit holes leading to the gap passage to prevent liquefaction of sandy ground.