JP2812666B2 - Underground lining inner wall lining method and apparatus - 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 and an apparatus for lining an earth retaining wall on an inner wall of a deep pit.

[0002]

2. Description of the Related Art Conventionally, in the foundation work of a deep foundation such as a pier, an abutment, a steel tower, etc., a tubular corrugated sheet called a liner plate is attached to an inner wall of a vertical shaft while excavating a shaft for forming a deep foundation foundation in the ground. A method of assembling a reinforcing bar in a shaft and pouring concrete when a predetermined depth (for example, 10 to 30 m) is reached after earth retaining has been adopted. However, this method had the following problems. It is difficult to implement mechanized and robotized construction. Prescribed drilling of heavy iron liner plates every time
Automated and robotized construction is required for complicated and dangerous work, in which the liner plate member is lowered and assembled in a shaft in a bad environment every time (for example, 1 m). Is structurally difficult because of economics. It is difficult to increase the load carrying capacity of the pile. The clearance between the assembled liner plate and the excavation ground causes loosening of the ground, reducing the vertical and horizontal load carrying capacity of the pile. It is difficult to make a pile with the optimal diameter. In order to manufacture the liner plate according to the required diameter of the pile, it is not suitable from the viewpoint of the production period and economical efficiency. For this reason, construction may be performed with a diameter larger than the required diameter in design, which is not economical. As a countermeasure, without using a liner plate, every time excavation is completed, a method of spraying concrete or the like on the inner wall of the pit to form a retaining wall is attempted from the viewpoint of excellent pile performance and economy. There is a tendency. However, when implementing this method, it is necessary to use a special working device that can cope with deep shaft work, or to operate a spray nozzle while standing down in a shaft in a poor environment. Therefore, workability and efficiency were poor, and there was a problem in safety. As a countermeasure against this, Japanese Utility Model Laid-Open Publication No. Sho 62-16195,
263525, JP-A-6-221082 and the like have proposed an automatic spraying device for deep foundation work.

However, in each of the above prior arts, a single-cylinder spray nozzle is rotatably mounted on a gantry, and the single-cylinder spray nozzle is connected to a mortar or a concrete continuous supply device on the ground side via a hose to form a mortar. In this method, concrete or concrete was guided to a single-cylinder spray nozzle using compressed air as a medium and injected. Therefore, there were the following problems. Since the spraying is performed in a single direction by a single cylinder nozzle, a complicated three-dimensional operation of moving the single cylinder nozzle in the axial direction while swinging the single cylinder nozzle is necessary to obtain a lining layer over the inner wall of the shaft in a required range. . For this reason, it is difficult to partially secure a necessary lining thickness, or the lining thickness becomes unnecessarily excessive, and it is difficult to form a uniform lining layer smoothly and accurately. Since compressed air is used as a blowing medium for the material, dust and rebound are remarkably generated, making it difficult to perform efficient lining and deteriorating the working environment, making it difficult to monitor the blowing condition, and complicating the nozzle. In practice, it is difficult to automate in combination with the simple operation. The installation and use of an air compressor is indispensable because compressed air is used, and a long material supply hose or quick-setting agent supply hose is guided from the ground into a deep foundation shaft and connected to a single-tube nozzle to operate the single-tube nozzle. It is necessary to handle so as not to disturb. For this reason, the equipment and facilities become complicated and very expensive, and the construction cost increases.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and a first object of the present invention is to provide a smooth, accurate and efficient lining on the inner wall of a shaft immediately after excavation under low dust conditions. An object of the present invention is to provide a method which can be applied well. It is a second object of the present invention to provide a deep foundation pit inner wall lining device which is suitable for carrying out the above-mentioned invention, has a simple structure, and is inexpensive.

[0005]

In order to achieve the above object, the present invention provides a method for lining an earth retaining material on an inner wall of an excavation shaft of a deep foundation shaft, the method comprising the steps of: Is lowered into a deep foundation shaft, and the earth retaining material is continuously cut out and centrifugally projected onto the inner wall of the excavation shaft by a projection impeller to form an earth retaining wall. Further, in order to achieve the second object, the present invention provides a falling pipe at a lower portion of a tank which is hung up and down in a deep foundation shaft and has a storage chamber for retaining material therein, A feeder for cutting out the soil retaining material in the storage chamber is provided inside, and a rotatable impeller for projecting the soil retaining material in a radial direction is provided at a distal end of the falling cylinder. Preferably, the falling cylinder is provided with a mechanism for adding a quick-setting agent. The feeder is typically a screw feeder, and is rotatably driven by a drive motor provided in the tank. The impeller has a shaft cylinder attached to the outer periphery of the falling cylinder via a bearing, and the impeller is configured to be rotationally driven by a drive motor on a gantry fixed to the outside of the falling cylinder. It is suitable. The tank may be suspended by heavy cables such as a crane and lifted by the heavy equipment. Alternatively, it may be suspended by a heavy machine or the like via a translation type actuator inserted into the deep foundation shaft, and may be raised and lowered by the operation of the translation type actuator. In the present invention, the term "retaining material" is a concept including both wet mortar, concrete or dry mortar, and concrete, and the retaining material is a reinforcing material such as steel fiber. Includes those containing.

[0006]

According to the present invention, the material for earth retaining is put into the storage chamber of the tank beforehand by any means outside the mine,
After excavation of one or more times and excavation of the excavated soil is completed, insert the heavy equipment into the shaft. Then, the feeder is driven, the impeller is driven, and the tank is moved up and down in a region to be lined by a heavy machine or a translation type actuator. In this way, the soil retaining material in the storage chamber is quantitatively cut out by the feeder into the falling cylinder, and the soil retaining material that has moved down the falling cylinder is supplied to the rotating impeller, and is radially removed from each pocket of the impeller. It is centrifugally projected at the same time. Accordingly, the excavation shaft wall is uniformly and simultaneously lined over a certain area, and the simultaneous movement of the impeller in the axial direction creates a full-line simultaneous lining layer also in the axial direction.
The construction can be easily controlled only by raising and lowering the rotating impeller, no swinging of the material supply hose or the compressed air hose is required, and no measures are required to prevent them from getting entangled, so that the operation is extremely simple. For this reason, a smooth and uniform lining layer can be formed very simply and reliably. In addition, the soil retaining material is spread around the entire circumference by centrifugal force and has good adhesion, and does not have a form of impact spray to a small area as in the case of compressed air flow, so that dust and rebound are significantly reduced. In addition, the working environment can be kept good, and the material for retaining the earth and the quick-setting admixture can be used efficiently. The impeller and its driving motor can be mounted by using a part of the tank structure, and the structure is simple because the impeller only rotates around the falling cylinder axis and has no other movement mechanism. Compressor, continuous discharge pumping equipment for earth retaining material,
Since long transfer hoses are not required, the equipment required for lining can also be simplified, and the cost of soil retaining lining work for shafts for deep foundation foundation can be significantly reduced.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The present invention is applied to a construction method in which a step of performing earth retaining lining on an inner wall at the stage when a deep foundation shaft A is excavated to a predetermined depth and performing excavation again is repeated, and FIG. The example is shown in use, where A is a deep foundation shaft being excavated from the ground. B is a device of the present invention, which is a tank 1 for storing a retaining material such as mortar or concrete, a feeder 2 for continuously cutting the retaining material in the tank, and a retaining material cut from the feeder 2. An impeller 3 for projecting in the radial direction and a mechanism 4 for adding a quick-setting agent to the earth retaining material cut out from the feeder 2 are provided.

First, in the construction, when the excavator (not shown) is excavating a deep foundation shaft, the apparatus B of the present invention is received on an installation stand D disposed near the deep foundation shaft A, The required amount of earth retaining material is put into the tank 1. This charging method is optional, and can take a desired method according to the type and properties of the earth retaining material and the situation at the site, for example, from a mixer truck by a hose, or also by a clamshell, shovel, etc. Heavy machinery and cargo handling equipment. Then, once the excavation process of one batch is completed and the excavated earth and sand is discharged, the apparatus B of the present invention is lifted from the installation stand D by a heavy machine C such as a backhoe, a clamshell or a dedicated crane truck, and the radius of the deep shaft A It is lowered along the center in the direction and earth retaining lining is performed.

The earth retaining lining step is performed by the feeder 2
Is driven and the impeller 3 is rotated, and at the same time, the present invention B is moved at a predetermined speed in the axial direction of the shaft A. In this way, the earth retaining material contained and filled in the tank 1 is continuously cut down by the feeder 2 by a fixed amount and supplied to the center of the rotating impeller 3, where it is dispersed in the radial direction. It is sucked into each pocket of the impeller 3. By the rotation of the impeller 3, the light is simultaneously projected from each pocket in a substantially tangential direction and adheres to the inner wall a of the excavation shaft. The quick-setting agent is effective for obtaining a running layer having a high initial strength. When the dry mix is used as a material for retaining the soil, the quick-setting agent is used for retaining the powder in the tank 1 using a powder. Although it may be charged together with the material for use, at least when a wet mix is used as the material for retaining the soil, it is added and mixed in a passage from the tank 1 to the supply to the impeller 3. In this case, a liquid type is preferably used as the quick-setting agent, and is mixed with the earth retaining material and mixed by the process of being projected in the radial direction. When a quick-setting agent is used, a lining layer E having a high initial strength is formed on the inner wall a of the excavation shaft at the same time and has good continuity seamlessly on the entire circumference, and the impeller 3 is raised or lowered in this state. Because the projection position at the height level of the excavation shaft A changes, the lining layer is continued even in the height direction,
A smooth and uniform earth retaining lining layer can be formed smoothly and efficiently, and the generation of dust and rebound is very little because it is not sprayed with the pressure of compressed air, and the lining work environment is also good. The use efficiency of the admixture can be greatly improved.

The axial movement of the impeller 3 may be controlled by operating the heavy equipment C to raise or lower the entire suspension system, or by providing the translation type actuator 5 in the middle of the suspension system.
The translation type actuator 5 may be operated to raise and lower only the device B of the present invention. In the latter case, since the heavy equipment C does not need to be operated, movement control can be performed easily and accurately.

Next, an embodiment of the device B of the present invention will be described. 2 to 6 show a first embodiment of the device B of the present invention. The tank 1 has a top plate 1a at the upper end of the body portion, and an opening 100 that can be opened and closed is provided in the top plate 1a. The lower half portion of the body portion has a straight cylindrical shape through a tapered narrow portion 1b. A falling tube 1c is provided, and a storage chamber 101 capable of storing a retaining material is formed above the falling tube 1c. Then, connecting tools 102, 102 such as eyebolts are arranged at equal intervals in the top plate or the upper end region of the trunk.
The hanging member 6 such as a wire rope is fixed to the main member 102, and the hanging member 6 is directly connected to a main hanging member c such as a hanging rope or a beam descending from the heavy equipment C, or as shown in FIGS. Is connected to the translation type actuator 5 interposed in the middle of the main suspension member c.

A portion below the narrow portion of the tank 1 is preferably provided with a horizontal mount 7 fixed to the outside of the flow-down cylinder 1c. The lower end discharge portion 11 of the flow-down cylinder 1c is fixed to the mount 7. The impeller 3 is provided so as to penetrate and face the lower end discharge portion 11 in the axial direction. More specifically, the flow-down cylinder 1c has a flange portion 10 fixed to the gantry 7 with bolts or the like as shown in FIGS. The lower end discharge portion 11 of the falling tube 1c may extend downward while being integrated, but in this embodiment, the lower end discharge portion 11 is constituted by a discharge port body formed of a tube concentric with the falling tube, and a base is mounted by bolts or the like. 7 is fixed. A bearing 12 is provided on the outer periphery of the lower end discharge unit 11, and the impeller 3 is attached via the bearing 12 so as to be relatively rotatable.
The impeller 3 includes an upper plate member 3a, a lower plate member 3b opposed thereto, and a plurality of radial plates (eight in this embodiment) connecting between the upper plate member 3a and the lower plate member 3b. The blade body 3c is provided. Further, the impeller 3 has a cylindrical shaft (for example, a pulley) 3d which is fitted on the bearing 12 and the cylindrical shaft 3d is connected to the upper plate body 3a by a bolt or the like with a lower flange portion 30. A hole 31 having a diameter to receive the lower end of the lower end discharge portion 11 is provided through a center portion of the upper plate portion 3a, and a conical shape having a widened lower portion is formed at the center of the inner surface of the lower plate portion 3b. A dispersing body / bearing 3e having a shape similar to the above is fixed.

An impeller driving motor 8 is mounted on the gantry 7. Of course, one impeller driving motor 8 may be provided, but in the first embodiment, two impeller driving motors 8 are symmetrically disposed on the left and right sides of the downflow cylinder 1c from the viewpoint of weight balance. The output shaft of each impeller driving motor 8, 8 has a driving rotating body, for example, a driving pulley 8.
0 and 80 are fixed, and the driving rotating bodies 80 and 80 are connected to the cylindrical shaft 3 by transmission elements such as V-belts 81 and 81.
d. The driving rotators 80, 80 are covered with a cover 70 to prevent the attachment of splashes from the impeller 3c. The impeller driving motors 8, 8 are preferably selected so as to be capable of changing the rotational speed in a stepped or stepless manner and capable of reversible rotation. The drive type may be electric or hydraulic, and an example of the former is an inverter control motor.

The feeder 2 is preferably a rotary type having a mixing and stirring function. In this embodiment, a screw is used. The axis of the screw is the falling cylinder 1c.
The upper end of the shaft portion 2a is supported via a bearing 200 provided on the top plate 1a as shown in FIG.
a, the lower end of the shaft portion extends through the center of the lower end discharge portion 11, and the dispersion portion and bearing 3e of the impeller 3c.
It is supported by. The screw is at least the falling cylinder 1c
A screw blade 2b is provided below a region corresponding to the start end of the retaining blade, and the screw blade 2b stops falling of the earth retaining material stored in the storage chamber 101. And
A housing chamber 101 is provided at a shaft portion above the screw blade 2b.
The upper stirring blades 2c in the form of bars for loosening the soil retaining material deposited in the lower layer are arranged at intervals, and the lower shaft of the screw blade 2b has several lower stirring blades. The wing 2d is provided. The lower stirring blade 2d is made of, for example, a strip having a predetermined inclination angle with respect to the axis of the shaft so as to have a feeding performance. In this embodiment, as shown in FIGS. Two sheets are fixed at positions, and at positions on the different circumferences, they are fixed with a relationship of 90 degrees out of phase. The two strips at the 180 degree position have different inclination directions from each other. In this embodiment, the lower stirring blade 2d is not provided in the shaft located in the lower end discharge part 11, but it may be provided in this part as well. Of course, the shaft in the screw blade region may be provided. It may be provided. The feeder driving motor 9 is preferably capable of changing the number of rotations in a stepped or stepless manner. The driving type may be electric or hydraulic, and an example of the former is an inverter control motor.

The falling cylinder 1c is provided with a quick-setting agent adding mechanism 4. The quick-setting agent adding mechanism 4 moves the injection hole down the cylinder 1c.
And a plurality of nozzles preferably arranged at equal intervals on the circumference as shown in FIG. Of course, they may be arranged on different circumferences. In this embodiment, the disposition position of the nozzle is a region near the end of the screw blade 2b, but is not limited to this. In this embodiment, the nozzle is a top plate 1a.
Quick setting agent feeder 40 (pump in this embodiment)
Is connected via a conduit 400, and the suction side of the quick-setting agent feeder 40 is connected to a quick-setting agent tank 41 mounted on the top plate 1a in this embodiment. In addition, a water injection mechanism 4 ′ is provided in the flow-down cylinder 1 c for cleaning the flow-down cylinder 1 c after lining construction, adjusting the water-cement ratio of the material for retaining the soil, and forming a wet mix when a dry-mix material is used. ing. The water injection mechanism 4 'has a nozzle 4a having a water injection hole or an injection hole facing the center of the falling cylinder 1c or an angle displaced from the center, and at least one nozzle 4a on the same circumference, and the falling cylinder 1c Are preferably arranged in the height direction. On different circles, each nozzle may be out of phase in the circumferential direction.

In this embodiment, the nozzle 4a is a top plate 1a.
The suction side of the supply pump 42 is connected to a water tank 43 provided to surround the outer periphery of the tank 1. The water tank 43 has a water supply section 430 at an appropriate place. Providing the water tank 43 concentrically on the outer periphery of the tank in this manner is advantageous in terms of installation space. In addition, there is an advantage that the lower surface of the water tank 43 can be used as a receiving portion for the mounting base 5. The water injection mechanism 4 'and the quick-setting additive adding mechanism 4 may be separate systems. However, in order to allow the quick-setting additive adding mechanism 4 to inject water or a mixture of water and quick-setting additive when necessary, FIG. As described above, the conduit 400 of the quick-setting agent adding mechanism 4 is connected to the conduit 420 of the water injection mechanism 4 ′ via the check valve 401, and each of the conduits 40 upstream of the merging position is connected.
On / off valves 402 and 422 and flow control valves 403 and 423, respectively, which are remotely operated such as motor-driven type, are connected to 0 and 420, respectively. Circulation circuits 404 and 424 for returning the binder to the water tank 43 and the quick binder tank 41, respectively.
Is connected.

FIGS. 7 and 8 show a second embodiment of the present invention. In this embodiment, one drive motor 8 for the impeller 3c is mounted on one side of the gantry 7, and on the other side, a quick-setting agent supply device 40, a water supply pump 42 and the valves are arranged as a unit. A quick-setting agent and water are supplied to the quick-setting agent addition mechanism 4 and the water injection mechanism 4 '. In this embodiment, the quick-setting agent supply device 40 and the water supply pump 42 are connected to the top plate 1.
Since it is not necessary to install the material at a, it is safe against the danger of dangerous materials falling from above the shaft, and the input port 100 for the retaining material can be formed large, thereby shortening the filling time. There are advantages that can be. FIG. 9 shows a third embodiment of the present invention.
An embodiment is shown, in this embodiment, the gantry 7 has a ring shape, and a quick-setting agent tank 41 is mounted in addition to the quick-setting agent supply device 4, the water supply pump 4 'and the valves. In addition, you may make it mount the water tank 43 further.

As described above, the apparatus B of the present invention may be suspended from the heavy equipment C by a hanging cable or the like, and may be raised or lowered within a predetermined height range by controlling the boom or arm. In this embodiment, the translation type actuator 5 is used to perform the lifting and lowering, and the tank 1 is attached to the telescopic rod 50 of the translation type actuator 5 by the hanging member 6.
Are detachably connected via the. Examples of the translation type actuator 5 include an electric power cylinder and a hydraulic cylinder using a screw mechanism. In this example, an electric power cylinder is used, and an electric motor 51 is mainly mounted. The drive units of the projection impeller drive motor 8 and the feeder drive motor 9, the quick-setting agent supply device 40, the water supply pump 42, and the valves 402, 403, 422, and 423 are connected via control cables in the case of the electric drive type. In the case of a hydraulic drive type, it is connected to a drive control device outside the mine via a hydraulic conduit.

In the embodiment shown in FIGS. 10 and 11, the translation type actuator 5 is provided with a guide mechanism 52 for centering the impeller 3c and suppressing runout during the lining operation. FIG. 10 shows a fixed guide mechanism 52.
A support member 520 made of a rod or a plate is provided on the outer periphery of the translation actuator 5 at equal intervals (for example, at three equally spaced positions), and a shoe 521 made of a bar or a plate is provided on the support member 520. FIG. 11 shows that the guide mechanism 52 is movable, and a plurality of stays 522 that can be opened and closed are arranged at equal intervals (for example, 3
At the time of construction, each of the stays 522 is opened in the radial direction so that the stays 522 are brought into contact with or approach the inner wall of the deep-founded shaft. In this embodiment, the length of the stay 522 can be adjusted by adjusting means 523 (for example, holes and bolts), and the open state can be maintained and opening and closing operations can be maintained by auxiliary means 524 such as a spring, a link, or a mini cylinder. I am getting it.

The mounting stand D outside the mine has a support portion d for the body of the tank 1, and a chute d 'for feeding guide is preferably provided above the retreat so as to be retractable. The present invention is not limited to the above embodiment. Other embodiments include the following. The drive system of the impeller 3c is of a pulley and belt type in the embodiment, but is not limited to this, and may be of any type such as a chain sprocket type or a gear drive type. When the quick-setting agent addition mechanism 4 and the water injection mechanism 4 ′ are composed of a plurality of nozzles, each nozzle may be a separate body,
A ring nozzle having a collecting pipe surrounding the falling cylinder may be used. The quick-setting agent tank 41 may be provided so as to surround the body of the tank 1 like the water tank 43 in some cases. The screw shaft as the feeder 2 is hollow, and an injection nozzle is provided on the screw shaft in the region of the falling cylinder 1c.
A quick-setting agent adding mechanism of a type in which the quick-setting agent is introduced from the upper end portion of the screw shaft portion and the quick-setting agent is sprayed in the radial direction from the injection nozzle of the screw shaft portion. Further, this type may be used in combination with an addition mechanism from the outside of the falling cylinder as shown in the figure. The shaft of the screw may be a free end without reaching the impeller 3c. In this case, it is preferable to provide a stay at the middle of the storage chamber of the tank 1 to support the middle of the shaft. The water tank 43 may be mounted on the top plate 1a in some cases. A monitoring camera is mounted on the gantry 7 or the tank 1 as necessary.

Next, a lining method according to the present invention will be described. Excavation is performed at a predetermined depth of, for example, 1 to 2 m by a rock drill or blasting to excavate the bottom of the pit, and the excavated soil is discharged to the ground. Let it. Prior to this, the apparatus B of the present invention is received on the installation stand D outside the mine, and in this state, the retaining material is injected and filled into the storage chamber 101 from the input port 100 by any means. Hereinafter, the case where a wet mix is used as a retaining material will be described as an example.
A mixture of a predetermined water / Selant ratio and a slump value is supplied from a storage tank carried by a mixer truck or helicopter by a hose, a conveyor, a clamshell, or the like. Since the screw blade 2b is in contact with or approaching the inner wall of the falling tube 1c, the earth retaining material that has been input is prevented from falling by the screw blade 2b. The quick-setting agent tank 41 is filled with a quick-setting agent, and water is loaded into the water tank 43. In this state, the apparatus B of the present invention is lifted by the heavy equipment C as described above, and is positioned on the center line of the shaft A. During this time, the feeder driving motor 9 may be stopped, or may be rotated in the opposite direction so that the earth retaining material is not supplied to the impeller 3 and is stirred by the upper stirring blade 2c. The quick-setting agent discharged from the quick-setting agent supply device 40 is returned to the quick-setting agent tank 41 by the circulation circuit 404.

In a state where the motor is lowered to a predetermined position, electric power or hydraulic pressure is supplied to the impeller drive motor 8 and the on-off valve 402 by the drive control device outside the mine, and the feeder drive motor 9 is raised to the operation speed. Let it. In this case, although the impeller 3 rotates because the cylindrical shaft 3d is rotated, the lower end discharge portion 11 of the falling cylinder 1c is fixed to the gantry 7 because the edge is cut off with respect to the cylindrical shaft 3d by the bearing 12. Put in the state. On the other hand, when the feeder driving motor 9 is rotated at a predetermined rotation speed, the material for retaining the soil in the storage chamber of the tank 1 is a speed proportional to the rotation speed of the screw blade 2b while being stirred by the upper stirring blade 2c. Depression 1b
From below, and when it reaches the lower part of the falling cylinder 1c, it is sent to the center of the impeller 3 through the lower end discharge part 11 while being sheared by the lower stirring blade 2d. At the same time, the quick-setting agent is continuously injected via the conduit 400 from the region of the screw blade 2b or from the falling cylinder position corresponding to the lower stirring blade 2d downstream therefrom toward the center of the falling cylinder.

As a result, a quick-setting agent is mixed into the earth retaining material passing through the falling cylinder 1c, and the lower stirring blade 2d
The mixture is agitated and mixed by a combined operation of feeding, returning and shearing, and flows into the center of the impeller 3 from the lower end discharge portion 11. Since a divergent dispersion body 3e that also serves as a screw shaft bearing is desired at this portion, the earth retaining material mixed with the quick-setting binder is changed in the radial direction,
It is sucked into each pocket between the rotating blade parts 3c, is discharged in a distributed manner from each radial pocket by centrifugal force, and is applied to the inner wall a of the deep shaft. Since the spraying direction is not one-way as in the case of a single cylinder type nozzle, the material for earth retaining from each pocket is distributed all over the circumference and is simultaneously attached on the circumference of the inner wall a of the deep foundation shaft, so that it is smooth and uniform. Lining layer is created. In addition, since there is no local and impactful adhesion to the deep foundation shaft inner wall a due to the air flow as in the case of the compressed air system, the generation of dust and rebound is small, and the initial use effect of the quick-setting agent is fully utilized. A lining layer having high strength can be formed very efficiently.

When the translation type actuator 5 is operated in this state, the extension of the telescopic rod 50 causes the tank 1 to move.
And the gantry 7 and the entire impeller 3 mounted thereon are stroked in the direction of the shaft of the deep shaft, and during this time, the entire circumference is simultaneously projected by the rotation of the impeller 3, so that the lining layer has smooth continuity. As a result, a uniform lining layer E is efficiently formed on the unlined deep foundation shaft inner wall a. Therefore, the heavy machine C side need only perform the operation of lowering the impeller 3 until the height level of the impeller 3 reaches the lower end region of the previous lining layer and holding the position thereof, and stroke the batch excavation length h under the control of the translation type actuator 5. The operation is simple and reliable, and one or more of the number of repetitions of the extension stroke and the shortening stroke of the translation actuator 5, the number and direction of rotation of the impeller driving motor 8, and the number of rotations of the feeder driving motor 9 are controlled. By controlling appropriately, a uniform lining layer having a desired thickness can be applied in a short time.
Moreover, there is no need to swing a compressed air hose or a material supply hose. Therefore, since remote control can be performed easily and reliably from outside the deep shaft shaft, appropriate automatic lining can be performed. In addition, since the lining can be performed under low dust conditions as described above, the running state can be easily visually recognized, and the monitoring television camera is mounted on the pedestal 7 or the like, so that automatic monitoring can be easily performed from outside the deep foundation shaft. be able to.

When the lining for the excavation is completed in this way, the motor 9 for driving the feeder is stopped, or the reversing drive is performed so that the feed is not started and solidification of the lining material can be prevented. The drive of the motor 8 is stopped, and the on-off valve 402 of the quick-setting agent supply system is closed to switch to the circulation system. Let it. Then, when the on-off valve 422 of the water supply system is opened, water is injected from each water injection mechanism 4 ′ into the falling cylinder 1 c, and is also injected from the quick setting agent adding mechanism 4 via the check valve 401 into the falling cylinder 1 c. Therefore, the quick-setting binder and the material for retaining the earth adhering to the falling cylinder 1 c and the screw are washed away and flow out from the tip of the impeller 3. After that, before the next excavation work, the material for earth retaining was put into the tank from the input port 100, and the quick-setting agent and water were replenished. Then, the above operation may be performed.

When dry mortar or dry mix concrete is used as the retaining material, the quick-setting agent may be charged into the tank 101 together with the retaining material. However, in a normal case, the quick setting agent is added together with the water by the addition mechanism 4 of the falling cylinder 1c. In this case, the on-off valve 422 of the water supply system and the on-off valve 4 of the quick-setting agent supply system
02, and the water flows from the water injection mechanism 4 '
c, the water flows through the check valve 401 to the quick-adhesive agent supply system, merges with the quick-adhesive agent, and is injected from the quick-adhesive agent addition mechanism 4 into the falling cylinder 1c. Therefore, the dry mix material is made into a wet mix state in which it is mixed with water and a quick setting agent by the lower stirring blade 2d of the screw, and is supplied to the impeller 3 from the lower end discharge portion 11 in this state, and as described above, the inner wall of the deep foundation shaft is formed. Efficient, uniform, low-dust, low-rebound projection over the entire circumference.

[0027]

According to the first aspect of the present invention described above, each time the excavation process is completed, the retaining material required for the lining is lowered into the deep foundation shaft, and the retaining material is continuously cut out to excavate the shaft. Because of the centrifugal projection on the wall, a simple operation of controlling the movement in the shaft axis direction makes it possible to accurately and efficiently apply a smooth and uniform lining, and also to remove soil retaining material and compressed air. Since there is no need to sequentially supply from the outside, complicated operation operation outside the mine is not required, and automation can be easily realized.In addition, since compressed air is not used, dust generation and rebound loss are also reduced. An excellent effect is obtained, such as a small amount of the quick setting agent, which can be used efficiently. According to the second aspect, in addition to the effects of the first aspect, the structure can be made extremely simple because no compressed air hose or earth retaining material pressure feeding hose is required, and the control for lining is also simple. Automation is easy, and there is no need to install and operate a continuous discharge type retaining material pumping means outside the mine.
In addition, since no compressor is required, and the swinging control of the compressed air hose and the retaining material pressure feeding hose is not required, the excellent effect that the construction equipment and the operating cost can be greatly reduced can be obtained.

According to the third aspect, the flow of the earth retaining material contained in the tank can be stopped except during the lining operation, and the thickness of the lining can be easily and freely adjusted at the time of construction. Excellent effect can be obtained. According to the fourth aspect, since the projection impeller and the motor for driving the projection impeller are provided using a part of the tank as a support, an excellent effect that the structure can be simplified and small can be obtained. can get. According to claim 5,
Because the material for retaining material cut out by the feeder can be mixed with the quick setting agent before being supplied to the projection impeller, an excellent effect that a lining layer having a high initial strength can be formed can be obtained. . According to claim 6,
Since the water tank is provided using the surrounding wall of the tank, an excellent effect that a compact apparatus can be obtained even in the case of lining using dry mix material is obtained. According to the seventh aspect, an excellent effect is obtained in that the axial movement of the projection impeller for each lining can be easily performed without operating the heavy equipment.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of a method and an apparatus for lining an inner wall of a deep corner pit according to the present invention.

FIG. 2 is an enlarged partial cutaway side view of a main part of the device of the present invention.

FIG. 3 is an enlarged view of a downstream cylinder portion in FIG. 2;

FIG. 4 is a plan view of FIG. 2;

FIG. 5 is a sectional view taken along line XX of FIG. 2;

FIG. 6 is a sectional view taken along the line YY of FIG. 3;

FIG. 7 is a longitudinal sectional side view showing another embodiment of the present invention.

FIG. 8 is a plan view of the same.

FIG. 9 is a plan view showing another embodiment of the present invention.

FIG. 10 is a side view showing an embodiment of a tank suspension mechanism according to the present invention.

FIG. 11 is a side view showing another embodiment of the tank suspension mechanism according to the present invention.

[Explanation of symbols]

 A Deep Foundation Shaft a Deep Foundation Shaft Inner Wall 1 Tank 1c Flowing Down Tube 2 Feeder 3 Impeller 4 Quick Additive Addition Mechanism 4 'Water Injection Mechanism 5 Translation Actuator 8 Impeller Driving Motor 9 Feeder Driving Motor 11 Shaft Tube 43 Water Tank 101 Housing Room

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuo Ugata 4-1 Egasaki-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Electric Power Research Laboratory, Tokyo Electric Power Company (72) Inventor Sakae Nakai 518 Komagaki, Nagareyama-shi, Chiba Prefecture No. 1 Mitsui Construction Co., Ltd. (72) Inventor Tatsuo Ito 518 Komagaki, Nagareyama City, Chiba Prefecture No. 1 Mitsui Construction Co., Ltd. (72) Inventor Masataka Uozumi 3-7 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 Mitsui Construction Co., Ltd. Machinery Department (56) References JP-A-7-158380 (JP, A) JP-A 58-12191 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , (DB name) E21D 5/00 E21D 11/10

Claims (7)

(57) [Claims] 1. A method for lining an earth retaining material on an excavation inner wall of a deep foundation shaft, wherein the earth retaining material required for lining is lowered into the deep earth shaft each time the excavation process is completed, and the earth retaining material is continuously laid. A deep pit inner wall lining method characterized by constructing an earth retaining wall by cutting into a pit and centrifugally projecting the excavation shaft. 2. A means for lining an earth retaining material on an excavation inner wall of a deep foundation shaft, comprising: a tank having a storage room for the earth retaining material internally suspended in the deep foundation shaft so as to be able to move up and down. A falling cylinder is provided in the lower part, a feeder for cutting out the soil retaining material in the storage chamber is provided in the falling cylinder, and a rotatable impeller for projecting the retaining material in the radial direction is provided at the tip of the falling cylinder. An inner wall lining device for a deep corner pit, which is provided. 3. The lining device according to claim 2, wherein the feeder is a screw feeder. 4. An impeller having a shaft tube rotatably mounted on the outer periphery of the tip of a falling tube, wherein the shaft tube is rotatably driven by a driving motor on a gantry fixed to the falling tube. The inner wall lining device of a deep corner pit according to claim 2 or 3, wherein 5. The inner wall lining device of a deep corner pit according to claim 2, wherein the falling cylinder has a mechanism for adding a quick-setting agent. 6. The inner wall lining device for a deep foundation pit according to claim 1, including a device in which a water tank is provided on a surrounding wall of the tank. 7. The deep pit inner wall lining device according to claim 2, wherein the tank is suspended by a heavy equipment or the like via a translation type actuator.