JPS59109613A - Grouting work and apparatus therefor - Google Patents

Abstract

PURPOSE:To raise the bonding strength of grout-solidified body with rockbed or soil particles by a method in which a grout is injected under pressures into ground and rockbed and a supersonic wave is applied to the injected grout. CONSTITUTION:A grout injector 3 with supersonic wave generators 5, 6 and 7 is inserted into a guide hole 2 provided in a rockbed 1, and packers 11 are applied to one or two places. A grout is injected through a pipe 9 while generating supersonic waves by the supersonic wave generators 5, 6 and 7, and the packer 11 and the grout injector 3 are removed out. The shearing and bonding strengths of the grout-solidified body with rockbed or soil particles become 10- 20 times higher than those in the conventional works, and grouting into even the ground of very small water permeability is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for injecting plow 1 to material into the ground or bedrock,
This article relates to a grouting method for improving bedrock and equipment used in that method.

It has been widely practiced to improve the ground and bedrock by injecting milk into grouting material, such as cement 1, into the ground and bedrock.

However, when using the conventional grouting method, the injection device is inserted into the guide hole for grout 1 drilled in the ground or rock, and cement 1 to milk-like grout 1 is poured at a predetermined pressure.
Since the method involved injecting material into the tube, there were the following problems.

(1) Clara 1 - The adhesion strength between the solids, soil particles, and rock surface is weak.

(2) The conventional grout 1 method has a water-stopping effect of at least 10.
Only about cm/se, c can be obtained. On the other hand, recently the J stiffness is low, the hydraulic conductivity is 10 cm/sec,
The water-stopping effect of t-da has become required, but the conventional technology cannot meet this requirement.

(3) In recent years, the long-term durability and long-term soundness of Clara 1 to solid bodies have become longer, and conventional techniques cannot cope with this problem.

(4) When there are intercalated objects such as clay in cracks in the bedrock, the water stop effect 1 strength increase is extremely low9 The present invention was made to solve the above-mentioned problems of the conventional grout-go method.
According to the grouting method 1 of the present invention, injection pressure is applied to the injected grout so as to apply ultrasonic waves to the injected grout material. This ultrasonic wave may be applied at the same time as the grouting method 1, or it may be applied after the grouting method is finished. In addition, in the case of the former method, a plow 1 device that is equipped with an ultrasonic transmitter is used in the grout injection device, and in the latter case, an ultrasonic transmitter is used separately from the grout injection device. Prepare a transmitter and press J><. Grout material name (1 person) The grout itself can be used as is, which has been widely used in the past, and the ultrasonic transmitter can be a conventionally known type that generates ultrasonic waves by transmitting an ultrasonic transmitter j'. can be used.

Gura 91 injected in this way - Super high waves on the moon! −j, the inflow direction of the injected grout material can be regulated,
Gra91~Moon can be injected into extremely minute gaps, ensuring a reliable injection effect, and the adhesion strength between the soil particles or rock surface and the grouting hole is significantly higher than with conventional methods. , Kisuke has a remarkable ground improvement effect. The reason why this adhesive strength is so strong is that compression waves generated by ultrasonic waves are generated by water and soil particles.
It is possible to generate a tensile wave at the current surface of 1B, and to generate an ultrasonic wave 1/
This is thought to be due to the movement of water at high speed due to the vibration phenomenon.

First, an example of an apparatus implemented in the grouting method 1 of the present invention will be explained with reference to FIG.

The figure shows a grout injection device equipped with an ultrasonic transmitter inserted into a grout guide hole pre-drilled in the rock, where 1 is the rock to be ground-improved and 2 is the plastic guide hole pre-drilled in the rock. At a predetermined depth within the guide hole 2, a grouting injection neck having an ultrasonic transmitter generally indicated by 3 is inserted into the hole. Several ultrasonic transmitter cages and rings 5 are provided at the tip of the ultrasonic transmitter insertion pipe 4, and the ultrasonic transmitter element 6 is mounted in the casing 5.
and an ultrasonic horn 7. A power cable 8 is connected to the ultrasonic transmitter, and the cable 8
is connected to a power source (not shown) on the ground through a switch through a pipe 1.

Reference numeral 9 designates a grout 4,1 injection pipe, and in this embodiment, the grout injection vibe 9 is integrated with the ultrasonic transmitter insertion vibe 4 through a connecting portion 10. 11 is an example of the construction of a packer installed between the rock and the rock. Explain with reference to figures (a) to (e).

Rock ai! There is a crack 12 in the rock 1, and a guide hole 2 is drilled in the rock 1 in the conventional manner (Fig. 2 (a)).

Next, the injection device 3 is inserted into the grout 1, which has an ultrasonic transmitter 11 in the guide hole 2, to a predetermined depth! (Figure 2 (b)).

Next, Para) a-11 in one or two places 4J (
Figure 2 (c)). J3, the number of packers 11 is crack 12
Depending on the position of and guide hole 2σ7 positional relationship, decide whether to use one pot location or two locations. .

Next, while transmitting ultrasonic waves using the ultrasonic transmitter 5.6.7, the plow 1 (not shown) is started and milk is injected from the injection vibrator 9 (see Fig. 12). <two)).

After injecting for a predetermined period of time, the packer 11 and the grout injection device 3 equipped with the mL wave transmitter are removed (see Fig. 2).
Ho)).

In the construction example described above, ultrasonic waves are transmitted at the same time as the grout is injected, but in the conventional construction method, the grout is first injected, and after the grout has been injected, ultrasonic waves are applied to the injected grout. It's okay. In this case, the grout injection device and the ultrasonic transmitter can be used separately.

As shown in Figure 3, the diameter of the test column A is 71-, which has a diameter L = 15 cm. 2 = 77.5 mm hole was made, and the ratio of water and cement was 1~, water: t? A small-diameter column B made of grout is formed by injecting a grout with a ratio of 1-=1.6:1, and the shear resistance force τ (kMcJ) between the column B that is not subjected to ultrasonic waves and the column that is subjected to ultrasonic waves is was measured.

Note that the shear resistance force is given by τ-1/2XJ (compression force x extraction force).

The shearing resistance force τ when no ultrasonic waves are applied is 1°59k
o/c++1, and the shear resistance force τ when ultrasonic waves were applied was 32.59 kM-.

Further, FIG. 4 shows the results of a field test using the method of the present invention and the conventional method, which were treated with ultrasonic waves for 3 minutes. When using the construction method of the present invention, the pulling force reached 4000 kg after 4 to 5 days had passed, but when using the conventional construction method, no significant increase in the pulling force was observed as the days passed. .

Comparing the two after 4 days had elapsed, a was 3650 ko when using the method of the present invention, while it was only 125 ko when using the conventional method.

As explained above, when using the method of the present invention, the following excellent effects were obtained.

(1) The shear adhesion strength between the grout solids and the rock mass bt.
It was 0 times.

(2) Grout can be formed even in ground with extremely low hydraulic conductivity, such as fine rock or clay.

(3) The strength of the grouted ground and rock is significantly greater than in the case of conventional construction methods, and a high water-stopping effect can be obtained.

(4) The equipment is simple and the construction is much less troublesome than conventional construction methods.

(5) The device can be made larger or smaller depending on the rock and ground to be poured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a part of a grouting device used in the grouting method of the present invention. FIG. 2 (A) to (E) are process charts showing an example of the construction order. Third
The figure is a perspective view showing the test column. FIG. 4 is a graph showing the results of the field test. 1... Bedrock 2... Guide hole for grout
3... Grout device 4... Ultrasonic transmitter insertion pipe 5... Ultrasonic transmitter casing 6...
Ultrasonic vibration element 7... Ultrasonic bone 8...
・Power cable 9... Grau l-U injection pipe 1
o... Connecting member 11... Packer 12...
・Crack patent applicant: Kajima Corporation (zl), (b)
(c) (d) (e)

Claims (6)

[Claims] (1) In the grouting method, a guide hole for grout is drilled into the ground or rock, and grout is injected into the ground or rock using the guide hole to improve the ground or rock. , Plow 1~ construction method characterized by injecting moon into grout 1 into bedrock and applying ultrasonic waves to the injected grout material. (2) The grouting method according to claim 1, wherein ultrasonic waves are applied to the grout at the same time as the grout material is injected. (3) The plow 1 construction method according to claim 1, wherein ultrasonic waves are applied to the grout material after the plow 1 material is injected. (4) In a grouting device that improves the ground or rock by drilling a guide ball for grout into the ground or rock and using the guide hole to inject grout into the ground or rock, the grouting device The grout 1 which is inserted into the hole and injects the grout material, and the grout 1 which is inserted into the guide hole and is injected similarly to the material injection station and the ultrasonic transmitter which gives ultrasonic waves to the material. grouting equipment. (5) The plow device according to claim 4, wherein the grouting material injection device and the ultrasonic transmitter are integrated. (6) The grouting device according to claim 4, wherein the grout injection device and the ultrasonic transmitter are separate bodies.