JPH06336720A - Construction of solidifier-injected structure - Google Patents

Abstract

PURPOSE:To unify an infected structure as a unit, by adopting a double-structural construction injected simultaneously composed of a construction in which a solidifier is injected only in a specified direction from an injection nozzle and another construction of the peripheral zone of the injected layer, added with a slow-hardening material and the core zone added with a quick-hardening material. CONSTITUTION:An injection rod 1 is rotated repeatedly at a specified angle to inject a solidifier in the inside with an injection nozzle 3. Next, an injection layer A of solidifier is constructed to form an arced constructed face in the inside and form a straight wall-shaped construction face in the outside. The arced constructed face and the straight wall-shaped construction face are fitted before the injected layer A is solidified completely in correspond to the incomplete junction of the injection layer A with the adjacent solidifying layer and then the injected layer A is constructed. The peripheral part of the infection layer A is infected with a slow-hardening material and the core part D is injected with a quick-hardening material at the same time to form a double-structural junction. When inserting the infection rod 1 into the ground, a detachable mechanism of the front end parts is equipped at the front end of rod 1 to separate it at a specified depth and place the core part D at the same time with the construction of injection layer A. In this way, enough strength is obtained and working efficiency can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a hardening material injecting structure which is constructed for the purpose of stabilizing soft ground, foundation of a structure, support of natural ground and the like.

[0002]

2. Description of the Related Art Conventionally, a hardening material injecting structure has been formed by sequentially arranging cylindrical hardened layers formed by rotating an injecting rod by a high-pressure injection injecting method, and adjoining adjacent ones. The formation of the hardened layer has been performed after the completion of the hardening reaction of the hardened material in order to avoid the collapse of the unreacted portion.

It is known that the injection rod is reciprocally rotated within a range of a predetermined angle to form a ground hardening material injection layer having a fan-shaped cross section.
Although it has been done in part, it is mainly made up of columnar hardened layers, and it has not been done to build up a structure by continuously connecting only the ground hardened material injection layer having a fan-shaped cross section. Absent.

As for the injection of the hardening material, a composite injection in which a slow-setting hardening material and a quick-setting hardening material are combined and injected is proposed. There is nothing that constitutes a double structure of.

Further, although many proposals have been made for installing the core material, the core material is not installed at the same time in the hardening material injection layer forming step because it is a step different from the step of forming the hardening material injection layer.

[0006] It has already been proposed (Japanese Patent Application No. 2-164170, etc.) to open a slime suction hole at a position spaced a predetermined distance from the injection nozzle of the injection pipe rod, and this application is applied to this application. To do.

[0007]

Problems to be Solved by the Invention In the conventional construction of a structure in which a cylindrical hardened layer is successively provided, a cylinder is formed by rotating an injection rod by a high-pressure injection injection method. The curing agent injection pressure is 20 in all directions
There is a problem that a pressure of 0 kilogram-per-square centimeter to 400 kilogram-per-square centimeter is load-accumulated and causes a ground uplift and a jet phenomenon in an unrelated portion.

Further, since the adjacent hardened layer is formed after the completion of the hardening reaction of the hardened material, the work procedure is not good and wasteful time is required. Although it does not completely fuse with each other, it forms a column by creating a dividing line, which causes a strength problem depending on the application.

Furthermore, since the curing material injection layer completes the curing reaction as a unit, there is a need to choose between slow-moving property and quick-setting property, and it is possible to perform work with a wide range of steps. I could not do it.

[0010] Therefore, for the structure for supporting purpose, in which the curing strength of the curing material must be absolutely trusted, there is no choice but to perform the work after waiting for the curing reaction of the curing material to be completed. A problem remains with respect to the deformation of the hardener injection layer that occurs upon completion of the hardening reaction.

[0011]

The present invention is a proposal for addressing the above-mentioned problems. First, a range of a predetermined angle from the outer edge of the structure to be formed toward the inside of the structure. By reciprocally rotating the injection rod in the inside, the direction of the injection nozzle is limited to the inside of the structure, and the load of the curing material injection injection pressure is concentrated inside the structure.

As a result, a ground hardening material injection layer having a fan-shaped cross section is formed, and the formation surface in the injection and injection direction is arcuate, whereas the boundary area of the injection angle range is straight and straight wall-shaped. Since the surface is formed, it is possible to construct the outer yard of the structure as a straight wall surface with the arc-shaped construction surface inside.

Before the completion of the curing reaction of the hardening material injection layer, the joining part of the hardening material injection layer to be connected to the adjacent hardening layer is not completely fused to form a partition line to form a column. In addition, by adjoining the arc-shaped surface and the straight wall-shaped surface adjacent to the injection layer, a ground hardening material injection layer with a fan-shaped cross section was created to create a structure in which the joints were completely fused and integrated. It was successful.

Second, the hardening material injection layer has a double structure in which the peripheral portion of the injection layer is simultaneously injected with a loose-setting curable material, and the core portion is simultaneously injected. Further, the tip of the injection rod is operated from the ground portion. A possible core material tip attachment / detachment mechanism is provided, and when inserting the injection pipe rod into the target ground, the core material tip is mounted and inserted, and it is removed at a predetermined depth to set the core material at the same time as the hardening material injection layer is formed. It is possible to cope with not only the strength but also the improvement of work efficiency.

[0015]

[Function] By limiting the direction of the injection nozzle to the inside of the structure and concentrating the load of the curing material injection injection pressure on the inside of the structure, the inside pressure of the structure is gradually increased by the injection pressure. Store energy.

This internal pressure energy acts as an expansive force and acts on the bonding area of the hardening material injection layer formed adjacent to the injection layer before the completion of the curing reaction to promote fusion of the bonding area. No injection pressure is applied because the injection nozzle is not directed to the outside of the structure.

It has already been proposed (Japanese Patent Application No. Hei 2-164170, etc.) to open a slime suction hole at a position spaced a predetermined distance from the injection nozzle of the injection pipe rod, and the operation is also described in the specification. However, by applying this to the present application, the structure can be more effectively formed.

That is, since the excess slime generated by the high-pressure injection has an external pressure on the injection rod, if the injection rod is provided with an opening, the slime naturally flows into the opening to release the internal pressure.

By this mechanism, when excess slime is sucked into the opening, that is, the suction hole provided at a predetermined interval from the hardening material injection nozzle, the hardening material injection pressure or the injection air applied to the rising force of the slime is increased. Since the load is reduced and the porosity is increased, the reaching distance of the jet of the injected hardening material is extended.

On the other hand, when the internal pressure energy accumulated in the excess slime is released by inhaling the slime into the inhalation hole, the slime inhalation amount in the inhalation hole decreases in proportion to the decrease in the accumulated energy, and the curing material caused by excessive inhalation. The injection layer slimming phenomenon is automatically avoided.

The appropriate distance between the injection nozzle and the suction hole varies depending on the diameter of the injection rod, the type of the hardening material, and the injection pressure. However, if the appropriate distance can be adjusted, the synergistic effect of injection and suction will result. A very effective injection can be performed.

Next, the ground hardening material (particularly cement milk) is injected from the injection nozzle at high pressure, and at the same time, from the injection holes provided at appropriate intervals from the injection nozzle, the instantaneous hardening material (at a lower pressure than the injection of the hardening material). In particular, when water glass is jetted out, the water glass enters the cement milk injection part to cause a momentary setting reaction and only that part momentarily sets to obtain strength and prevent deformation. The appropriate distance from the suction hole is appropriately set depending on the diameter of the injection rod, the type of the hardening material, and the purpose of forming the hardening material injection layer.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. An injection rod 1 is supported by the operation mechanism 2 and is given operations such as lowering, raising, rotating, and reciprocating 360 degrees. A superposition injection nozzle 3 is provided on the side wall of the tip portion of the injection rod 1, and a core nozzle 31 of the injection nozzle 3,
The surrounding nozzle 32 and the suction hole 5 have multiple paths open to the respective openings.

The superimposing injection nozzle 3 injects the hardening material, air, and fresh water, if necessary, supplied through the swivel 4, into the ground through the nuclear nozzle 31 or the surrounding nozzle 32 that opens from different paths. To do.

An injection hole 33 for the instantaneous curing agent is opened in the lower portion of the superimposing injection nozzle 3 (of course, it may be in the upper portion if necessary), and the instantaneous curing agent is ejected to the high-pressure injection core portion to cause the nozzle. Three
Prevent the collapse of required parts until the completion of the hardening reaction of the ground hardening material injection part from.

Reference numeral 5 denotes a suction hole, which is opened at a predetermined interval above the superposition injection nozzle 3 (if necessary, it may also be a lower part), and the excess slime generated by the injection operation from the injection nozzle 3 has internal pressure energy. Inhale using
It is sent to the ground slime processing mechanism 6.

A plurality of inclined jet nozzles 52 are provided on the inner wall of the discharge path 51 where the suction hole 5 is opened, and a pumping mechanism for generating a spiral airflow in the slime discharge direction by the air jet is constructed. .

Further, the tip end portion of the injection rod 1 is provided with a core material tip end attaching / detaching mechanism 7 which can be operated from the ground portion, and the tip end portion of the core material D is mounted when the injection rod 1 is inserted into the target ground. By injecting the hardened material, the hardened material is removed at a predetermined depth and left in the ground to inject the hardened material, whereby a hardened material injection layer having a core material is formed.

Using the device system as described above, the injection rod 1 is propelled and inserted into the target ground by an appropriate means such as rotation.

At a predetermined depth, the ground hardening material is injected from the core nozzle 31 of the superposition injection nozzle 3 at a high pressure of, for example, about 400 kilograms per square centimeter and a flow rate of about 200 liters per minute, and air is supplied from the surrounding nozzle 32 (in the case of Depending on the situation, a surrounding nozzle that further surrounds the surrounding nozzle 32 is provided, and fresh water is sprayed from the surrounding nozzle. In some cases, neither the air nor the fresh water is sprayed), and the injection rod 1 is predetermined. When reciprocating while rotating back and forth at an angle, a high-pressure and high-speed hardening material jet cuts and agitates the target ground in a fan shape, and a fan-shaped hardening material injection layer is formed.

On the other hand, the muddy water slime which has lost the crushing force due to the injection and becomes saturated is sucked from the suction hole 5 by the internal pressure energy accumulated in the slime itself by the subsequent injection, and the density of the hardened material injected at high pressure is adjusted. Increase the porosity of the ground.

The inhaled slime is accelerated by the spiral lifting mechanism by air injection from the inclined injection nozzle 51 opening to the discharge path 52, and is sent to the slime processing mechanism 6 through the discharge path 52.

During this period, the injection pressure is not applied to the portion which is directed backward in the high-pressure injection direction, but the internal pressure on the injection direction side and the supporting force of the adjacent hardening material injection layer before the completion of the curing reaction are applied. Especially in the case of horizontal injection, there is a risk of collapse rather than collapse.

Therefore, at the same time as the high-pressure jet direction, the instantaneous hardening agent is jetted from the above-mentioned jet holes 33 to the core portion of the high-pressure jet layer at a pressure lower than that of the hardener jet to cure the ground hardener injection portion from the nozzle 3. Prevent the collapse of required parts until the reaction is completed.

In this case, if cement milk is used as the ground hardening material, water glass is used as the instantaneous hardening agent, and this serves as a hardening reaction agent, which has a sufficient effect.

In addition, a mechanism for ejecting the instantaneous curing agent to the core portion of the high-pressure injection layer and a tip end portion attaching / detaching mechanism 7 are provided so that the tip end portion of the core material B is mounted when the injection rod 1 is inserted into the target ground. The means for inserting and removing it at a predetermined depth and leaving it in the ground can be applied not only in the case of forming a fan-shaped hardening material injection layer, but also in the case of forming a cylindrical hardening material injection layer. Needless to say.

As described above, the density of the hardened material which is injected at high pressure from the superposition injection nozzle 3 is adjusted by inhaling slime,
Since the soil hardening material injection layer A1 is created on the fan column by stirring and mixing the surrounding soil with increased porosity, this is illustrated by injecting the adjacent hardening material injection layer A2 before the completion of the hardening reaction. As described above, the components are sequentially arranged in parallel and continuously in a predetermined structure.

At this time, the reciprocating rotation angle of the injection rod can be variously set according to the purpose, but if this is set to 180 degrees, the layer surface of the high pressure injection direction back portion B1 of the hardening material injection layer A1 is flat. Then, the injection region C1 of the instantaneous curing agent through the ejection holes 33 provided in the back portion also becomes a semicircle of 180 degrees, and a protective layer is formed in the core portion of the curing material injecting layer.

At the same time, the strength of the protective layer can be further strengthened by leaving the tip of the core material D with a piano wire or the like in the ground and forming the hardening material injection layer.

When this is set to 120 degrees, the layer surface of the back portion B1 in the high-pressure injection direction of the hardening material injection layer A1 becomes a ridge surface of 120 degrees, but the injection of the instantaneous hardening agent through the ejection holes 33. Area C1
Also has a fan shape of 120 degrees. As shown in FIG. 4, when the hardening material injection layers A2, A3, ... A structure in which the ejection surfaces are fitted to each other and reinforced is created, and the structure can be utilized depending on the type of the target structure.

Further, a hardening material injection layer is formed in a circle,
If the high-pressure injection direction is concentrated at the center of the circle, the injection pressure will be concentrated at the center of the circle and the ground of the same part can be strongly compacted, and that part can be used according to the application. . It is of course possible to inject the hardening material simultaneously using a plurality of injection rods.

[0042]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, in the first invention, the hardening material injection pressure can be concentrated in a specific direction and used, and the ground can be used in a direction other than the intended direction. It is possible to avoid annoying phenomena such as bumps.

Further, the hardening material is injected only in a specific direction,
Since the hardener is not injected in the unnecessary direction, the hardener can be saved accordingly.

If a slime suction hole is provided so as to suck in excess slime, the injection effect is diminished, and muddy water sludge, which causes pollution, is sucked and removed in the immediate vicinity of the injection nozzle, and the injection pressure is effective. As a result, the reaching distance of the hardening material jet can be extended, and a fan-shaped hardening material injection layer with high purity can be formed.

Further, the second invention can be widely applied including the case of forming a columnar hardening material injecting layer, and the hardening material can be prevented from collapsing until the hardening reaction of the ground hardening material injecting portion is completed. In addition to serving to strengthen the injection layer and prevent deformation,
The uncured surrounding portion supported by the core portion where the curing reaction is completed and the cured material injection layer formed adjacent to each other are fused by the cured unreacted portion to integrate the structure.

Further, if the tip of the core material D is left in the ground by the core material tip attaching / detaching mechanism 7 that can be operated from the ground, and the core material is installed at the same time when the hardening material injection layer is formed, the core material is re-established. There is no need to perform construction for installation, which is extremely advantageous in terms of work efficiency, and is also effective in strengthening the instantaneous connection part that prevents the collapse of the required part until the curing reaction of the ground hardening material injection part is completed .

[0047]

[Brief description of drawings]

FIG. 1 is an overall explanatory view showing a construction situation in a vertical direction according to an embodiment of the present invention.

FIG. 2 is an overall explanatory view showing the construction situation in the horizontal direction as well.

FIG. 3 is an enlarged vertical sectional view of the tip of the injection rod.

FIG. 4 is a diagram showing an example of a structure in which hardening material injection layers are arranged in parallel and a structure combining them.

FIG. 5 is a structural example diagram in which the high-pressure injection direction is concentrated at the center of the circle.

FIG. 6 is an enlarged cross-sectional view of a discharge path at a portion where the inclined jet nozzle is installed.

[Explanation of symbols]

 1 Injection Rod 2 Operation Mechanism 3 Polymerization Injection Nozzle 31 Nuclear Nozzle 32 Circumferential Nozzle 33 Instantaneous Hardening Material Injection Hole 4 Swivel 5 Suction Hole 51 Inclined Injection Nozzle 52 Discharge Path 6 Slime Treatment Mechanism 7 Core Material Tip Attachment / Detachment Mechanism A Curing Material injection layer B Backward direction of high-pressure injection C Injection area of instantaneous curing agent D Core material

Claims (5)

[Claims] 1. An injection rod provided with an injection nozzle on a side wall of a tip end of an injection rod having a multi-division path is inserted into a target ground, and high pressure is applied from an outer sill position of a structure to be formed toward an inner side of the structure. While injecting the ground hardening material, the injection hardening rod is reciprocally rotated within the range of a predetermined angle while being pulled out to form a ground hardening material injection layer having a fan-shaped cross section, and before the hardening reaction of the hardening material is completed, A method for constructing a hardening material injection structure, characterized in that a ground hardening material injection layer having a fan-shaped cross section is sequentially formed by adjoining the injection layer, and the layers are continuously formed into a predetermined structure. 2. A slime suction hole is opened at a position spaced a predetermined distance from the injection nozzle of the injection rod, and excess slime produced by injection of the curing material is sucked into the suction hole and discharged from the suction hole through a discharge path in the injection rod. The method for constructing a hardening material injection structure according to claim 1, wherein the ground hardening material injection layer having a fan-shaped cross section is formed. 3. An injection hole of the instantaneous hardening material is provided at an appropriate distance from the injection nozzle of the injection rod together with its supply path, and the instantaneous hardening material is simultaneously injected into a required portion of the hardening material injection layer. The method for constructing the hardened material injection structure according to claim 1 or 2, wherein the collapse of a required portion of the hardened material injection layer is prevented until the curing reaction. 4. An injection rod is provided with an injection nozzle on a side wall of a tip end portion of an injection rod having a multi-divided path, and an injection hole of the instantaneous hardening material is provided at an appropriate distance from the injection nozzle together with its supply path. While inserting into the target ground, jetting the ground hardening material at high pressure and simultaneously ejecting the instantaneous hardening material,
Construction method of hardened material injection structure that creates cylindrical ground hardening material injection layer with instantaneous hardening layer in core by rotating and pulling out injection rod 5. A core material tip attaching / detaching mechanism that can be operated from above the ground is provided at the tip of the injection rod, and when inserting the injection tube rod into the target ground, the tip of the core material is worn and inserted to a predetermined depth. By separating this and leaving it in the ground and injecting the hardening material, a hardening material injection layer having a core material is created. "Claim 1""Claim2""Claim3""Claim4" Construction method of the described hardening material injection structure