JP2702337B2 - Construction method of hardened material injection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a hardened material injection structure formed for the purpose of stabilizing soft ground, foundation of a building, and supporting a ground.

[0002]

2. Description of the Related Art Conventionally, a hardening material injection structure is formed by sequentially connecting columnar hardened layers formed by rotating an injection rod by a high-pressure injection injection method. The formation of the hardened layer has been performed after the hardening reaction of the hardened material is completed in order to avoid the collapse of the unreacted portion.

[0003] Reciprocating the injection rod 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 performed in some places, it is mainly based on the continuous connection of columnar hardened layers, and it has been performed to construct a structure by connecting only the ground hardening material injection layer with a fan-shaped cross section over the entire surface. Absent.

As for the injection of a hardening material, a composite injection in which a slow-setting hardening material and a quick-setting hardening material are combined and injected has been proposed. Nothing constitutes a double structure.

[0005] Furthermore, there are many proposals for the installation of the core material, but the process is different from the formation of the hardened material injection layer, and the core material has not been installed at the same time in the hardened material injection layer formation process.

It has been already proposed (Japanese Patent Application No. 2-164170) to open a slime suction hole at a predetermined distance from the injection nozzle of the injection pipe rod. Is what you do.

[0007]

A conventional structure in which a columnar hardened layer is sequentially connected is formed by rotating an injection rod by a high-pressure injection injection method to form a cylinder. In all directions, the hardening material injection pressure is 20
There is a problem that a pressure of 0 to 400 kilograms per square centimeter is accumulated and a ground swelling or eruption phenomenon occurs in an unrelated part.

In addition, since the formation of the adjacent hardened layer is performed after the completion of the hardening reaction of the hardening material, not only the work procedure is bad and wasteful time is required, but also the joint portions between the adjacent hardened layers enter the surfaces. Although they are not completely fused, they are divided into columns with partition lines, which may cause strength problems in some applications.

Further, since the hardening material injection layer integrally completes the hardening reaction, it is necessary to choose between loosening and instantaneous setting, which makes it possible to perform a wide process in the process. I could not do it.

[0010] Therefore, for a structure for the purpose of supporting the hardening material, which must absolutely rely on the hardening strength of the hardening material, there is no choice but to wait until the hardening reaction of the hardening material is completed. Problems remain with respect to the deformation of the cured material injection layer that occurs upon completion of the curing reaction.

[0011]

Means for Solving the Problems The present invention is a proposal for addressing the above-mentioned problems. First, the present invention proposes a range of a predetermined angle from the outer peripheral position of the structure to be formed toward the inside of the structure. By reciprocating 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 injection pressure for hardening material injection 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 has an arc shape, whereas the boundary region of the injection angle range is a linear straight wall formation. Since the surface is formed, it is possible to configure the outline of the structure as a straight wall surface with the arc-shaped creation surface inside.

[0013] In addition, the joint portion between the connected hardened material injection layer and the adjacent hardened layer is not completely fused, and a partition line is formed to form a column. Then, an arc-shaped surface and a straight wall-shaped surface are fitted adjacent to the injection layer to form a ground hardening material injection layer with a fan-shaped cross section. Successful.

Secondly, the hardened material injection layer has a double structure in which the surrounding portion is simultaneously injected with a loose-setting hardening material and the core portion is simultaneously injected with a quick-setting hardening material. 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 attached and inserted, detached at a predetermined depth, and the core material is installed simultaneously with the formation of the hardened material injection layer This makes it possible to cope with the strength and to cope with an increase in work efficiency.

[0015]

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

This internal pressure energy acts as an expansion force and acts on the bonding area of the hardened material injection layer formed adjacent to the injection layer before the completion of the hardening reaction, thereby promoting fusion of the bonding area. Since the injection nozzle is not directed to the outside of the structure, no injection pressure is applied.

It has already been proposed to open a slime suction hole at a predetermined distance from the injection nozzle of the injection tube rod (Japanese Patent Application No. 2-164170), and the specification of the same application also discloses the effect. However, by applying the present invention to the present application, it is possible to more effectively form a structure.

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

When the excess slime is sucked into the opening or suction hole provided at a predetermined interval from the hardening material injection nozzle by this mechanism, the hardening material injection pressure and the injection air applied by the rising force of the slime. Since the burden is reduced and the porosity is increased, the reach of the injected hardening material jet is increased.

On the other hand, when the internal pressure energy accumulated in the surplus slime is released by slime suction into the suction hole, the amount of slime sucked into the suction hole decreases in proportion to the decrease in the stored energy, and the hardening material due to excessive suction The slimming phenomenon of the injection layer 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 occur. An extremely effective injection can be performed.

Next, a ground hardening material (especially cement milk) is injected from the injection nozzle at a high pressure, and simultaneously a flash hardening material (lower than the hardening material injection) is injected from the injection holes provided at appropriate intervals from the injection nozzle. In particular, when water glass is spouted, the water glass penetrates into the injection portion of the cement milk to cause a flash reaction, and only that portion flashes to obtain strength and prevent deformation. An 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. Reference numeral 1 denotes an injection rod which is supported by an operation mechanism 2 and is provided with operations such as lowering, rising, rotating, and reciprocating 360 degrees. The polymerization injection nozzle 3 is provided on the tip side wall of the injection rod 1, and the core nozzle 31 of the injection nozzle 3 is provided inside the polymerization injection nozzle 3.
The surrounding nozzle 32 has a multiple path that opens to each opening of the suction hole 5.

The polymerization spray nozzle 3 sprays a hardening material, air, and if necessary, fresh water or the like supplied through the swivel 4 into the ground through a core nozzle 31 or a surrounding nozzle 32 which is opened from a different path. I do.

An injection hole 33 for the instantaneous hardening agent is opened at the lower portion of the polymerization injection nozzle 3 (or, if necessary, at the upper portion), and the instantaneous hardening agent is jetted to the high-pressure injection core. 3
Prevents collapse of the required part until the hardening reaction of the ground hardening material injection part is completed.

Reference numeral 5 denotes a suction hole which is opened at a predetermined interval above the polymerization spray nozzle 3 (or lower if necessary), and converts excess slime generated by the spray operation from the spray nozzle 3 into its internal pressure energy. Inhalation using
It is discharged to the slime processing mechanism 6 on the ground.

A plurality of inclined spray nozzles 52 are provided on the inner wall of the discharge path 51 where the suction holes 5 are opened, and a lifting mechanism for generating a spiral airflow in the slime discharge direction by the air injection is formed. .

At the tip of the injection rod 1, a core tip attachment / detachment mechanism 7 operable from the ground is provided, and when the injection rod 1 is inserted into the target ground, the tip of the core D is mounted. The hardened material injection layer having a core material is formed by inserting the hardened material at a predetermined depth, removing the same at a predetermined depth, and leaving it in the ground to perform hardened material injection.

Using the above-described apparatus system, the injection rod 1 is propelled and inserted into the target ground by a suitable means such as rotation.

At a predetermined depth, a ground hardening material is injected from the core nozzle 31 of the polymerization injection nozzle 3 at a high pressure of, for example, about 400 kilograms per square centimeter and at a flow rate of about 200 liters per minute, and air is injected from the surrounding nozzle 32 In some cases, a surrounding nozzle is provided to further surround the outside of the surrounding nozzle 32, and fresh water is injected from the surrounding nozzle, and in some cases, neither air nor fresh water is injected. When reversing while rotating back and forth at an angle, the high-pressure, 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, muddy water slime that has become saturated due to the loss of crushing force due to the injection is sucked from the suction hole 5 by the internal pressure energy accumulated in the slime itself by the subsequent injection, and the hardened material injected at a high pressure is adjusted in density. To increase the porosity of the ground.

The sucked slime is accelerated by a spiral lifting mechanism by air injection from an inclined injection nozzle 51 opening to a discharge path 52, and is fed into the slime processing mechanism 6 through the discharge path 52.

During this time, the injection pressure is not applied to the portion facing the high-pressure injection direction, but the internal pressure on the injection direction side and the support force of the adjacent hardened material injection layer before the completion of the curing reaction are applied. In particular, in the case of horizontal injection, there is a risk of the problem collapse rather than collapse.

Therefore, at the same time as the high-pressure injection direction, the instantaneous hardening agent is jetted from the jet hole 33 to the core of the high-pressure injection layer at a lower pressure than the injection of the hardening material, and the hardening of the ground hardening material injection portion from the nozzle 3 is performed. Prevent collapse of required parts until the reaction is completed.

In this case, if cement milk is used as the ground hardening material, by using water glass as the instantaneous hardening agent, it becomes a hardening reactant and has a sufficient effect.

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

As described above, the density of the hardened material injected from the polymerization injection nozzle 3 is adjusted by suction of slime.
The ground hardening material injection layer A1 is created on the fan column by stirring and mixing the surrounding soil with increased porosity, so before the hardening reaction is completed, the adjacent hardening material injection layer A2 is injected to illustrate this. As shown in FIG.

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

At the same time, the strength of the protective layer can be further enhanced by forming the hardened material injection layer while leaving the tip of the core material D such as a piano wire in the ground.

If this is set to 120 degrees, the layer surface of the back-facing portion B1 of the high-pressure injection direction of the hardening material injection layer A1 becomes a 120-degree ridge surface. Area C1
Also, as shown in FIG. 4, the hardened material injection layers A2, A3,. A reinforced structure is formed by fitting the ejection surfaces to each other, and can be utilized according to 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 is concentrated at the center of the circle and the ground at the same part can be compacted strongly, 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]

Since the present invention is constructed as described above, in the first invention, the hardening material injection pressure can be concentrated and used in a specific direction, and the ground pressure in a direction other than the intended direction can be utilized. Annoying phenomena such as bumps can be avoided.

Further, a hardening material is injected only in a specific direction,
Since the hardening material is not injected in an unnecessary direction, the hardening material is saved correspondingly.

If a slime suction hole is provided to suck in excess slime, the injection effect is reduced, muddy sludge, which is a cause of pollution, is sucked and removed in the immediate vicinity of the injection nozzle, and the injection pressure is reduced. This has the effect of extending the reach of the hardening material jet and forming a fan-shaped hardening material injection layer of high purity.

The second invention can be applied widely including the case of forming a column-shaped hardening material injection layer. The hardening material is prevented by preventing the required portion from collapsing until the hardening reaction of the ground hardening material injection portion is completed. While helping to strengthen the injection layer and prevent deformation,
The uncured peripheral portion supported by the core after the completion of the curing reaction is fused with the cured material injection layer formed adjacent to the cured unreacted portion to integrate the structure.

Further, if the tip of the core material D is left underground by the core material tip attaching / detaching mechanism 7 which can be operated from the ground portion and the core material is installed simultaneously with the formation of the hardened material injection layer, the core material can be renewed. There is no need to perform installation work, which is extremely advantageous in terms of work efficiency, and is also effective in strengthening the instantaneous connection part that prevents collapse of required parts until the hardening reaction of the ground hardening material injection part is completed. .

[0047]

[Brief description of the drawings]

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

FIG. 2 is an overall explanatory view showing the construction status in the horizontal direction.

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

FIG. 4 is a view showing an embodiment of a parallel arrangement of a hardening material injection layer and a structure combining the same.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection rod 2 Operation mechanism 3 Superposition injection nozzle 31 Nuclear nozzle 32 Surrounding nozzle 33 Instantaneous hardening material injection hole 4 Swivel 5 Suction hole 51 Inclined injection nozzle 52 Discharge path 6 Slime processing mechanism 7 Core material tip attachment / detachment mechanism A Hardening Material injection layer B High pressure injection direction backward part C Injection area of quick-setting hardener D Core material

 ──────────────────────────────────────────────────続 き Continuing from the front page (73) Patent holder 999999999 Kashiwayama Kogyo Co., Ltd. 8-11 Nadainmachi, Tennoji-ku, Osaka (72) Inventor Shiro Nakajima 3-1-5 Satakedai, Suita-shi, Osaka (56) References JP-A-53-31311 (JP, A) JP-A-62-174412 (JP, A) JP-A-50-63712 (JP, A) JP-A-55-114705 (JP, A) JP-A-62-55316 (JP, A)

Claims (5)

(57) [Claims] 1. An injection rod having an injection nozzle provided on a side wall of a distal end portion of an injection rod having a multiple separation path, as appropriate means.
At a predetermined depth, the injection rod is reciprocated within a predetermined angle while spraying the ground hardening material at a predetermined depth from the outline position of the structure to be created toward the inside of the structure at high pressure. A ground hardening material injection layer with a fan-shaped cross section is created by pulling and moving while allowing the ground hardening material injection layer with a fan-shaped cross section by the same process to be adjacent to the injection layer before the hardening reaction of the hardening material is completed. A method for forming a hardened material-injected structure, wherein the structure is formed and continuous with a predetermined structure. 2. A slime suction hole is opened at a predetermined distance from the injection nozzle of the injection rod.
When the hardening material is ejected, the excess slime due to the hardening material injection is sucked into the suction hole at the time of the pull-out movement by the reciprocating rotation, and the ground hardening material injection layer having a fan-shaped cross section is formed while discharging the excess slime from the suction hole through the discharge path in the injection rod. Method for forming a cured material injection structure according to claim 1 3. A spouting hole for the instantaneous hardening material is provided at an appropriate interval from the injection nozzle of the injection rod together with a switchable supply path thereof , and at the time of injection of the hardening material, a predetermined portion of the hardening material injection layer is provided. A method for forming a hardened material injection structure according to claim 1 or claim 2, wherein a flash hardening material is simultaneously injected to prevent collapse of a required portion of the hardened material injection layer until a hardening reaction. 4. An injection rod is provided on an end side wall of an injection rod having a multiple separation path, and an injection hole of an instantaneous hardening material is provided at an appropriate interval from the injection nozzle together with a supply path thereof. Into the target ground, inject the ground hardening material at high pressure, and simultaneously spray the instantaneous hardening material
A method of forming a hardened material injection structure that creates a cylindrical ground hardened material injection layer with an instantaneous hardened layer at the core by rotating the injection rod and pulling out while ejecting at a pressure lower than the pressure 5. A core material tip attachment / detachment mechanism operable from the ground portion at the tip of the injection rod, and when inserting the injection rod into the target ground, the core material tip is attached and inserted, and at a predetermined depth. Pull it out and pull the injection rod while remaining in the ground
A hardening material injection layer having a core material is formed by injecting the hardening material while pulling out and moving.
[Claim 3] [Claim 4] The method for forming a hardened material injection structure according to claim 4