JPH0670324B2 - Ground hardening material injection method and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of soft ground, formation of a lining layer to prevent collapse or flooding when excavating a foundation of a structure or a lateral pile such as a tunnel or a tunnel. The present invention relates to a method for injecting a ground hardening material and an apparatus therefor used in, for example.

[Prior Art] Conventionally, for the injection of the hardened material, an injection rod having a drilling blade and a hardened material injection nozzle at the tip is inserted into the target ground, and the hardened material is ejected while being ejected to inject the hardened material around the rod. Then, a hardened layer is formed, and the hardened layers are formed in parallel to form a stable layer, a water stop layer, and a lining layer of the ground.

On the other hand, as the injection of the curing material has been used in various fields, various curing materials and injection methods have been developed, and the structure of the injection rod has become complicated. However, apart from the case where the insertion hole of the injection rod is previously excavated by a dedicated excavation machine, the conventional injection rod has both an excavation mechanism and an injection mechanism, and none has a mechanism for adjusting the excavation direction.

[Problems to be Solved by the Invention] In the conventional method, since the injection rod provided with both the excavation mechanism and the injection mechanism is used, the internal structure of the injection rod is complicated and there is almost no structural space to adjust the excavation direction. There was no room for a mechanism to do it. In addition, when excavating with a dedicated excavator, excavation and insertion would be troublesome twice, and it was necessary to be prepared for a great waste in terms of cost and time.

In particular, in the case of hardening material injection for forming a lining layer for tunnel or lateral hole excavation, it is difficult to dig straight because the tip of the injection rod lowers because the injection rod digs horizontally. . Further, even in the case of digging in the vertical direction, when the depth becomes deep, the injection rod bends due to its own weight and it is difficult to dig straight.

Under such circumstances, particularly when excavating in the horizontal direction, there is no choice but to subdivide into small sections and to excavate little by little. Therefore, there are many problems in efficiency.

[Means for Solving the Problems] In order to solve the above problems, the present invention selectively separates the structure part and the outer shell of the injection rod and uses a casing rod to selectively form the structure part into a unit structure. It is configured such that it can be inserted into and removed from, and a structural space can be secured if necessary, and an injection unit can be selected according to the situation of the injection target.

Also, in order to cope with the situation where the tip of the injection rod bends and it is difficult to proceed straight, it is necessary to support the excavating blade of the excavating unit that is inserted into the casing rod with an adjustable support shaft such as a universal joint, pusher mechanism, etc. It is possible to control the direction by adjusting the direction by adjusting the direction of the injection rod by irradiating the light from the light emitting mechanism installed on the excavation unit or the casing rod and the light receiving monitor that captures this. It is designed to ensure the accurate digging of the rod.

[Operation] If the casing rod is straight, the light emitted from the light emitting mechanism provided at the tail end of the excavation unit will go straight and be captured as it is at the base point on the panel provided on the light receiving monitor. To be done. When the casing rod bends under eccentric pressure, the light beam deviates from the base point, and the control jackie in that direction actuates, causing the piston to push the drilling blade in the normal direction. In this way, whether or not the injection rod is positioned in the correct excavation direction is constantly confirmed by the confirmation means such as the straightness of the light beam and the irradiation of the base point, and the excavation is performed while adjusting the direction of the excavation blade.

This excavation direction adjusting mechanism is constituted by a sufficient structural space in which only the excavation unit is fitted in the casing rod. When the casing rod is inserted to a predetermined depth in the target ground, the stopper of the excavation unit is removed, only the excavation unit is pulled up from the inside of the casing rod, and the injection unit is inserted instead.

The injection unit is prepared by combining a plurality of nozzles, a multi-nozzle, a multi-path configuration, and other dedicated configurations according to the target ground, and can be selected and inserted as needed, and the structural space for the excavation unit is utilized.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows the condition of the injection work in the horizontal direction, and FIG. 1B shows the condition of the injection work in the vertical direction. The operating mechanism of the casing rod 1 has its own characteristics, but basically, Since it is based on the conventional injection rod actuating mechanism, horizontal injection work, which has a wide range of applications such as a lining layer, will be described as an example.

Reference numeral 1 is a casing rod, and 2 is a support base that serves as a base, and is configured in the form of a carriage provided with moving means such as a caterpillar.

The support rod 2 includes a guide rod 41 that supports the casing rod 1 and guides forward and backward movement of the casing rod 1, a tilt mechanism 42 that tilts the guide rod 41 forward and backward, and a casing rod operation mechanism 4 that is provided with a vertical movement mechanism 43 that raises and lowers the guide rail 41. It is loaded. Further, the casing rod operating mechanism 4 is provided with a rotation drive device 44 for chucking and rotating the casing rod 1.

On the tip side of the casing rod 1, a pusher mechanism 5 composed of an oil jackie or the like is set in each direction of the inner peripheral surface, and when the excavation unit 6 is fitted, the tip excavating blade 9 is inserted.
And a propulsion adjustment mechanism for adjusting the direction, and a locking mechanism for inserting and removing the roller 11 and the injection unit 7 that support the rotation of the excavation unit 6 in the casing rod 1 and roll.
The light receiving monitor 3 is provided with 12 and the light emitted from the light emitting mechanism 94 provided in the excavation unit 6 is provided at the tail end.
Is provided.

A tip of the excavation unit 6 is connected by a universal joint 91, a spindle 92 that is adjusted in direction by the pusher mechanism 5, and a blade 93 that is divided into several blocks and is opened and closed by pressure contact with and removal from an excavation target. The light emitting mechanism 94 is provided at the tail end.

The injection unit 7 shown as an example includes an injection nozzle 71 and an injection nozzle 72, and the trailing ends of the injection units 71 and 72 are connected to the hardening material supply hoses 73 and 74 via swivels.

Reference numeral 75 denotes a mud hole, which sucks sludge from the surrounding soil pierced and excavated by the high-pressure injection of the hardening material from the injection nozzle 71, and releases the internal pressure to allow the hardening material to permeate evenly. Reference numerals 76 and 77 are air injection nozzles surrounding the injection nozzles 71 and 72, respectively, and 78 is an insertion stopper with respect to the casing rod 1.

Using the device as described above, first, the excavation unit 6 is fitted into the casing rod 1 and the excavation blade 9 is pressed against the target ground W, and the drilling water is ejected using the clearance of the unit, Blade 6 when rotating 6
Is opened, and the insertion rod 8 having a larger diameter than the casing rod 1 is drilled and excavated, and the casing rod 1 is press-fitted accordingly.

In this case, the excavation unit 6 is not fixed in the casing rod 1, but only the excavation unit 6 is rotated with the casing rod 1 left as it is, whereby the direction operation of the lateral hole such as the tunnel lining layer can be made accurate. . On the contrary, when inserting vertically, the excavation unit 6 is hooked in the casing rod 1 and rotated together with the casing rod 1 to excavate.

Therefore, the light beam emitting mechanism 94 provided at the tail end emits a light beam S such as a laser beam toward the light receiving monitor 3, and the site and direction of the casing rod 1 are determined by aiming at the base point.

When the casing rod 1 gradually descends due to its own weight during excavation or bends due to unbalanced pressure, the light beam S deviates from the base point of the light receiving monitor 3 and acts on the pusher mechanism 5 to operate the control jackie in that direction. The piston pushes the support shaft 92 and pushes up the excavating blade 9 in the normal direction.

In this way, when the casing rod 1 reaches the predetermined depth of the target ground W, the stopper of the excavation unit 6 is removed, only the excavation unit is pulled up from the inside of the casing rod 1, and the injection unit 7 is inserted instead. .

Therefore, while the jet nozzle 71 of the injection unit 7 jets a high-pressure hardening material jet of cement milk or the like and the jet nozzle 72 swirls a jet of fresh water that packs the escape of the hardening material, the casing rod 1 is retracted, By injecting the hardening material into the surrounding soil, the unit ground hardening layer P is formed around the insertion hole 8 into a columnar shape or a columnar shape having a fan-shaped cross section as shown in FIG.

Next, the ground hardened layer P2 is formed adjacent to the ground hardened layer P1 by the same process, and the ground hardened layer P2 is successively adjoined to form a lining layer surrounding the open / closed portion H, and the open / closed portion H is formed. Digging out and advancing the device, and further performing the same steps to form a lining layer.

The lining layer is formed one after another as described above, and advances along with the excavation to excavate the lateral pile. As described above, the structure of the injection unit 7 has various configurations as required and is selectively inserted. Also,
Injection is used not only for the lining of excavated parts, but also for the stability of soft ground and the foundation of structures, etc.There are also various configurations adjacent to the ground hardening layer, and the present invention can also be used in the case of vertical injection. Is.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the excavation unit, which is a dedicated machine, can be used during excavation without taking up any structural space for the injection mechanism, and the radiation beam can be aimed at. The position direction of the injection rod is automatically adjusted by simply adjusting the positions, and the cured injection layer can be formed accurately and reliably. Furthermore, without replacing the injection rod, it is possible to easily select an injection unit that fits the casing rod 1 and enable wide injection.

Moreover, it is possible to greatly reduce unnecessary work such as measurement work on the target ground and replacement work of the injection rod.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 shows the state of injection work in the horizontal direction, FIG. 2 is an overall explanatory view showing the state of injection work in the vertical direction, and FIG. FIG. 4 is an explanatory view showing an arrangement state of unit hardening layers that form a lining layer in the case of excavating a lateral hole such as a tunnel by injecting into a tunnel. FIG. Fig. 5 is a side sectional view showing the insertion and insertion state of the injection unit, similarly showing the casing rod as a cross section, and Fig. 6 is an excavation without the pusher mechanism and the light emitting mechanism with the casing rod as a cross section. It is a side view which shows the insertion state of a unit. DESCRIPTION OF SYMBOLS 1-Casing rod, 11-Rolling roller 12-Latch mechanism, 2-Support base 3-Light receiving monitor, 4-Casing rod operating mechanism, 41
〜 Guide rail, 42 〜 Inclination mechanism 43 〜 Vertical movement mechanism, 44 〜 Rotation drive device 〜 5 Pusher mechanism 、 6 〜 Excavation unit 〜 7 〜 Injection unit 、 71/72 〜 Injection nozzle 73/74 〜 Curing material supply hose 75 〜 Sludge discharge hole, 76 / 77-air injection nozzle 78-insertion stopper, 8-insertion hole 9-tip drilling blade, 91-universal joint 92-support shaft, 93-blade, 94-light emitting mechanism P-unit hardening layer , H ~ excavation part, S ~ ray W ~ target ground

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2-190595 (JP, A) JP-A-57-51328 (JP, A) JP-A-57-48015 (JP, A) Actual development Sho-54- 54111 (JP, U) Actually opened 59-160634 (JP, U)

Claims (5)

[Claims] 1. A digging unit having a directionally operable digging blade and a light emitting mechanism or a light receiving monitor is inserted into a casing rod having a unit inserting mechanism inside and a light receiving monitor or light emitting mechanism at the rear. Then, the light is emitted from the light emitting mechanism, and the light receiving monitor grasps the light to confirm the excavation direction and operate the direction of the excavation blade to proceed with the excavation and insert the casing rod to the specified depth of the target ground. At this point, the ground hardening material injection method is characterized in that the excavation unit is detached from the casing rod and the injection unit is inserted and injected instead instead. 2. The method for injecting ground hardening material according to claim 1, wherein only the excavation unit inserted into the casing rod is rotated in the casing rod to advance, and the casing rod is pushed to advance. 3. A ground hardening material injecting device comprising a casing rod, into which an excavating unit and an injecting unit are selectively inserted and which is detachably insertable, supported on a base having an operating mechanism and an injecting material supplying mechanism. 4. An excavating unit is provided with a directional excavating blade and a light emitting mechanism or a light receiving monitor for grasping light rays emitted from the light ray emitting mechanism, and a casing rod grasps light rays emitted from the light ray emitting mechanism. The ground hardening material injecting device according to claim (2), further comprising a light receiving monitor or a light emitting mechanism and a direction operating mechanism for the excavating blade. 5. An apparatus for injecting ground hardening material according to claims (2) and (3), characterized in that a plurality of types of injecting units having different structures are prepared so that they can be selected as needed.