JP2006124942A - Excavating equipment for caisson - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately control the settlement of a caisson by a simple method. <P>SOLUTION: This excavating equipment comprises: excavation bearing machines 30<SB>1</SB>-30<SB>4</SB>which are arranged in a plurality of places of the caisson 10 in such a manner that a difference of elevation between the machines 30<SB>1</SB>-30<SB>4</SB>and a horizontal excavator is set; a plurality of horizontal control devices 50<SB>1</SB>-50<SB>4</SB>which are arranged around the caisson 10 on a ground side; and a control part 60 for controlling the machines 30<SB>1</SB>-30<SB>4</SB>and the control devices 50<SB>1</SB>-50<SB>4</SB>. The control devices 50<SB>1</SB>-50<SB>4</SB>are equipped with monitoring means for detecting the vertical displacement of the caisson 10. When differences arise among pieces of detection information of the plurality of monitoring means, the control part 60 can individually control the operations of the machines 30<SB>1</SB>-30<SB>4</SB>so as to eliminate a difference between the vertical displacements of the caisson 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a caisson excavator for excavating a direct base board of blade edges of various caissons.

In general, the caisson method uses the weight of the concrete frame that constitutes the caisson, or applies a load from the outside and presses a sharp blade into the ground to excavate the caisson inside.

The above-described conventional caisson laying technique has the following problems.
(1) Although the operator digs by hand or performs machine digging by a backhoe or the like near the caisson blade edge, the caisson blade edge tends to swell and the worker is exposed to danger.
(2) Due to the need to sink the caisson while maintaining high verticality, the amount of settlement per day is as small as several centimeters.
Therefore, it takes a long time for construction, which is a major factor that increases construction costs.
(3) When there is a variation in the amount of caisson sinking and there is a tilt, there is a problem that it takes a lot of time and a lot of cost for the correction. It is very difficult to press-in the caisson with accurate horizontality and verticality.
(4) The applicant arranges a plurality of self-propelled excavators directly under the caisson blade edge, and reciprocates these excavators to sink the caisson while excavating the direct base plate of the blade edge. Previously proposed as JP-A-11-172688 and JP-A-11-269890.
The present invention has a problem that it is technically difficult to excavate every corner of the caisson with an excavator that reciprocates linearly when the caisson has a flat rectangular shape, and a hard part of the ground, for example, When there is variation in the strength of the excavation target ground so that the ground and soft ground coexist, there is a problem that it is technically difficult to adjust the inclination of the caisson by causing a difference in the amount of caisson settlement.

The present invention has been made to solve the conventional problems as described above, and the object of the present invention is to accurately monitor the amount of caisson settlement and maintain the caisson while maintaining high levelness and verticality. It is to provide caisson excavation technology that can be submerged.

The caisson excavator according to the first invention of the present application is an excavator for caisson that excavates a direct base plate of a caisson blade edge in which a horizontal excavator is disposed on the lower surface of the caisson blade edge so as to be reciprocally movable along the blade edge. A plurality of calipers provided at a plurality of locations in the caisson with a height difference from the horizontal excavator, a plurality of horizontal control devices arranged around the caisson on the ground side, and the excavator A control unit that controls the control device, the horizontal control device includes a monitoring unit that detects the vertical displacement of the caisson, and when there is a difference in the detection information of the plurality of monitoring units, the vertical displacement of the caisson In order to eliminate the difference, the control unit is configured to be capable of individually controlling the operation of the excavation bearing pressure machine.
The caisson excavation device according to a second invention of the present application is the above-described first invention, wherein the excavation supporter is provided integrally with a vertical axis extending downward from a blade edge of the caisson and a lower portion of the vertical axis, The blade includes a blade that functions as a drilling blade and functions as a resistance member that contacts the ground when rotation stops and prevents the caisson from sinking, and a motor that rotates the vertical axis. It is characterized by being connected to.
The caisson excavator according to a third invention of the present application is the above-described first invention or second invention, wherein the horizontal control device is screwed into a feed bolt having one end connected to the caisson, and a vertical displacement. A monitoring means comprising an elevating elevating disk, a motor for rotating the elevating disk, and a sensor for detecting the vertical displacement of the elevating disk is provided, and a detection signal of the sensor is input to the control unit, The motor electrically connected to the control unit is servo-controlled based on the detection signal of the sensor.
A caisson excavator according to a fourth invention of the present application is characterized in that, in any of the first to third inventions, the horizontal control device is mounted on a stationary member standing around the caisson. It is.

The present invention can obtain at least one of the following effects.
(1) Based on the difference in the detection information by the monitoring means of a plurality of horizontal control devices, the control unit individually controls the operation of the excavator bearing pressure so as to eliminate the difference in vertical displacement of the caisson. The caisson can be sunk while maintaining high levelness and verticality while accurately monitoring the amount of sag.
(2) Since the excavator supports not only the excavating function but also the function as a resistance member that prevents the caisson from sinking, the caisson sinking amount can be easily controlled.
(3) Since the vertical displacement of the feed bolt can be servo-controlled by a motor and the caisson settlement displacement can be controlled in millimeters, the caisson settlement can be performed while accurately controlling the amount of caisson settlement.

  The best mode of the caisson excavator according to the present invention will be described below with reference to the drawings.

<1> Outline FIG. 1 shows a plan view in which a part of the caisson 10 is broken, and a longitudinal sectional view of FIG.
The caisson 10 includes a plurality of horizontal excavators 20 _{1 to} 20 ₅ disposed so as to be capable of reciprocating immediately below the cutting edge of the caisson 10, a plurality of excavation pressure bearings 30 ₁ to 30 ₄ disposed in the caisson 10, and the periphery of the caisson 10. Are provided with a plurality of horizontal control devices 50 ₁ to 50 ₄ .

<2> Caisson The caisson 10 is a known concrete box such as an open type or a bottomed type. For example, precast concrete or a concrete constructed by placing concrete on site can be used.
The conventional caisson is sharply formed so that the blade edge can be easily pressed into the ground, whereas in the present invention, the lower end surface of the blade edge of the caisson 10 does not need to be sharp and is formed as a thick flat surface. To do.
When the caisson 10 is deeply set, the caisson is divided into a plurality of portions in the depth direction, and the extension caisson 10 housings are sequentially added in accordance with the sinking.
The horizontal cross-sectional shape (planar shape) of the caisson 10 is not limited to the quadrangle shown in this example, but may be a polygon, a circle, an ellipse, or the like.

  As shown in FIGS. 1 and 6, a discharge port 11 is formed in a lower part of the side surface of the caisson 10 as necessary. The excavated soil is discharged to the ground through the shaft 40 provided on the side of the caisson 10 through the discharge port 11. Conventionally, it has been necessary to dispose a large cutting and discharging device above the caisson 10, but providing the discharge port 11 eliminates the need to dispose a large cutting and discharging device above the caisson 10.

The caisson 10 is integrally provided with a plurality of connecting members 13 extending outward. The connecting member 13 is a torque transmitting member for transmitting the sinking displacement of the caisson 10 to a plurality of horizontal control devices 50 ₁ to 50 ₄ arranged at a plurality of locations around the caisson 10, and is preferably formed of, for example, a steel material.
As a fixing means for the connecting member 13, for example, one end of the connecting member 13 is removably attached to the upper portion of the caisson 10 with a bolt, or one end of the connecting member 13 is embedded in a concrete frame of the caisson 10 in advance. . In the latter case, the connecting material 13 is cut and removed at the time of replacement.

<3> Horizontal Excavator A plurality of self-propelled horizontal excavators 20 _{1 to} 20 ₅ are arranged on the lower surface of the blade edge of the caisson 10. In this example, _one horizontal excavator 20 _{1 to} 20 ₅ is provided in principle on each side of the caisson 10 that is square, and two horizontal excavators 20 are exceptionally provided on the side where the discharge port 11 is provided. ₄ and 20 ₅ are deployed.

The horizontal excavators 20 _{1 to} 20 ₅ have a common structure equipped with a traveling body provided with self-propelling means, a pair of horizontal screws provided parallel to the traveling body in parallel, and a rotational driving means for the horizontal screw. For example, the excavator disclosed in Japanese Patent Application Laid-Open Nos. 11-172688, 11-269890, and 2001-20293 previously proposed by the applicant can be applied.

The horizontal boring machine 20 ₁ to 20 _5, while drilling with cutting edge width of the caisson 10, the drilling unit can be discharged excavated soil to the inside of the caisson 10, engages the cutting edge of the caisson 10, the cutting edge lower surface Various excavators other than those described above can be applied as long as the excavator includes traveling means that reciprocates.
Further, the reciprocating movement and the moving distance of each of the horizontal excavators 20 _{1 to} 20 ₅ are configured so that automatic control or manual control by the control unit 60 can be performed.

<4> Excavation Supporting Machine Each shelf 12 is provided so as to protrude inside the corner of the caisson 10, and the excavation supporting machines 30 ₁ to 30 ₄ are provided on each shelf 12.
The excavator bearings 30 ₁ to 30 ₄ are devices having a subsidence prevention function (ground support function) that positively inhibits subsidence of the caisson 10 by obtaining a reaction force on the direct base plate of the blade edge in addition to the excavation function. is there.
The reason why the excavation bearing machines 30 ₁ to 30 ₄ are provided with the support function of the ground is to correct the posture of the caisson 10 during subsidence.

Referring to the illustrated excavating Bearing unit 30 ₁ to 30 ₄ in FIG. 1 and 2, each drill Bearing unit 30 ₁ to 30 ₄ are common structures, and disposed rotatably through the ledge 12 of the caisson 10, A vertical axis 31 extending downward from the blade edge of the caisson 10, a blade 32 provided integrally with a lower portion of the vertical axis 31, and a motor 33 that rotates the vertical axis 31 are provided.
The lower blade 32 of the vertical axis 31 is positioned below the operation trajectory of the horizontal excavator 20 in order to avoid collision with the horizontal excavator 20.

As shown in FIGS. 3 and 4, the blade 32 is configured by including a plurality of radiating blades 32 by radially cutting a disk, and the notched space formed between the radiating blades 33 functions as a discharge space for excavated earth and sand. To do. When a belt-like excavation bit 34 is provided on the lower surface of the end portion of the radiation blade 33, excavation performance is improved.
The blade 32 may be a known screw blade having a short axial length.

Further, the motor 33 of each excavation pressure bearing machine 30 ₁ to 30 ₄ is electrically connected to the control unit 60, and the control unit 60 can individually control the rotation and rotation stop of each blade 33.

<5> Regarding the relationship of the excavation range between the horizontal excavator and the excavator bearing As shown in FIG. 2, the excavator bearings 30 ₁ to 30 ₄ are positioned lower than the horizontal excavators 20 _{1 to} 20 ₅ . ing.
The difference in height between the two excavations is that the horizontal excavators 20 _{1 to} 20 ₅ avoid the interference (collision) with the excavation bearing pressure machines 30 ₁ to 30 ₄ when reciprocating. This is because the 20 excavation range is brought close to the corner of the caisson 10.

FIG. 3 is a view of a part of the corner of the caisson 10 as viewed from the blade edge side. The excavation range by the excavation bearing pressure machine 30 ₁ indicated by the two-dotted line is the horizontal excavator 20 ₁ provided on each side of the blade edge. as polymerization and drilling range of 20 ₂ caused by the reciprocating movement, by setting the diameter of the blade 32, it is possible to drill over the entire length of the cutting edge of the caisson 10.

<6> Horizontal Control Device As shown in FIG. 1, the horizontal control devices 50 ₁ to 50 ₄ deployed at a plurality of locations outside the caisson 10 on the ground side follow the sinking of the caisson 10 at a plurality of points of the caisson 10. Means are provided for detecting vertical displacement and monitoring variation (difference) in the amount of subsidence.
The horizontal control devices 50 ₁ to 50 ₄ are electrically connected to the control unit 60.
In addition, although this example shows the case where a total of four horizontal control devices 50 ₁ to 50 ₄ are provided for the planar quadrangular caisson 10, the number of installed units and the arrangement positions thereof are appropriately selected.

The present invention does not directly apply the entire weight of the huge caisson 10 to the horizontal control devices 50 ₁ to 50 ₄ . This is because the caisson 10 itself is supported mainly by the direct ground plate of the blade edge or the frictional resistance between the peripheral surface of the caisson 10 and the ground.
Horizontal control unit 50 ₁ to 50 ₄ in other words, particularly high strength not a device, the members constituting the horizontal control unit 50 ₁ to 50 ₄ for down hanging caisson 10 while supporting the total weight of the caisson 10 There is no need to design.

Since each of the horizontal control devices 50 ₁ to 50 ₄ has a common structure, one unit will be described with reference to FIGS.
The horizontal control device 50 includes a support column 51 that is a stationary member that is erected close to the caisson 10, a lifting / lowering disc 53 that is mounted on the substrate 52 of the support column 51 and is provided in a state that allows vertical movement, A feed bolt 54 that is inserted through the substrate 52 and reversibly screwed through the center of the elevating disk 53, a motor 55 that imparts rotation to the elevating disk 53, and the elevating disk 53 And a sensor 56 that detects vertical movement, and constitutes a monitoring means that detects vertical displacement at a plurality of points of the caisson 10 and monitors variations in the amount of subsidence.
Each component will be described in detail below.

[Elevating disk]
The elevating disk 53 is a plate placed in a state that allows the elevating / lowering relative to the substrate 52, and in this example, the case where the elevating disk 53 is constituted by a gear will be described. The lifting / lowering disk 53 is rotated by the rotation of the motor 55, and the lifting / lowering disk 53 is rotated so that the feed bolt 54 screwed into the central portion thereof can be displaced in the vertical direction.

[Feed bolt]
The feed bolt 54 is only disposed so as to penetrate the substrate 52, and can move up and down together with the lifting and lowering disk 53 with respect to the substrate 52.
The lower end of the feed bolt 54 and the connecting member 13 extending from the caisson 10 are connected by the connecting pin 14 so that the sinking displacement of the caisson 10 can be transmitted to the feed bolt 54 via the connecting member 13. Yes.
The total length of the feed bolt 54 has a length substantially equal to the height of the caisson 10 to be set so as to follow the sinking displacement over the entire height of the caisson 10.

[Sensor]
The sensor 56 is a sensor for detecting the vertical displacement of the elevating disk 52 and is electrically connected to the control unit 60.
For example, a limit switch can be adopted as the sensor 56 as shown in the figure. When the limit switch is employed, the idler wheel 57 provided in the detection unit at the lower end of the sensor 56 is placed on the upper surface of the elevating disk 52 and allows the vertical movement of the elevating disk 52 while allowing the elevating disk 52 to rotate. Detect displacement.
Although the sensor 56 may be directly fixed to the substrate 52, as shown in FIGS. 8 and 9, if the sensor 56 is attached via the height adjusting table 58 so that the installation height of the sensor 56 can be adjusted, the elevating circle The threshold value of the vertical displacement of the plate 52 can be arbitrarily adjusted.

  The sensor 56 may be a non-contact type optical sensor or various known sensors that can detect the vertical displacement of the elevating disk 52. Moreover, the detection target part by the sensor 56 is not limited to the upper surface of the elevating disk 52 but may be the lower surface or the circumferential surface thereof.

[motor]
The motor 55 is electrically connected to the control unit 60 and is a motor for rotating the elevating disk 53 so that the feed bolt 54 can follow the vertical displacement of the connecting member 13 based on a command from the control unit 50. is there.
As the motor 55, a servo motor capable of servo-feeding the feed bolt 54 is suitable. By using the servo motor, it is possible to follow the vertical displacement of the caisson 10 in millimeter units (minimum 1 mm).
The controller 60 servo-controls the motor 55 so that the feed bolt 54 can follow the sinking of the caisson 10.

<7> Control Unit The control unit 60 inputs the detection signal of the vertical displacement amount of the caisson from the plurality of sensors 56, analyzes the entire sinking state of the caisson, and based on the caisson settlement information, at least shown in FIG. The motors 33 of the excavation bearing pressure machines 30 ₁ to 30 ₄ and the motors 55 of the horizontal control devices 50 ₁ to 50 ₄ are individually controlled. The operation of the horizontal excavators 20 _{1 to} 20 ₅ may be controlled by the control unit 60 as necessary.

The control unit 60 analyzes the attitude of the caisson 10 based on the detection signals of the sensors 56 of the horizontal control devices 50 ₁ to 50 ₄ as follows.
(I) When the difference in the amount of settlement at all measurement points of the caisson 10 obtained through each sensor 56 is within the allowable range, it is determined that the horizontality (or verticality) of the entire caisson 10 is maintained.
(Ii) Among the measurement points of the caisson 10 obtained through each sensor 56, when the difference in the amount of subsidence is out of the allowable range, it is determined that the horizontality (or verticality) of the caisson 10 is not maintained. To do.

The controller 60 controls the motor 55 of each of the horizontal control devices 50 ₁ to 50 ₄ based on the caisson settlement information obtained from the sensor 56 as follows.
(I) When it is determined that the horizontality (or verticality) of the caisson 10 is maintained, the motors 55 of all the horizontal control devices 50 ₁ to 50 ₄ are continuously operated.
(Ii) When it is determined that the horizontality (or verticality) of the caisson 10 is not maintained, the operation of the motor 55 of any of the horizontal control devices 50 ₁ to 50 ₄ that detects the difference in vertical displacement is stopped. To do.

Further, the control unit 60 controls the motors 55 of the horizontal control devices 50 ₁ to 50 ₄ as described above, and at the same time controls the motors 33 of the plurality of excavation bearing pressure machines 30 ₁ to 30 ₄ as follows.
(I) When it is determined that the horizontality (or verticality) of the caisson 10 is maintained, the motors 33 of all the excavation bearing pressure machines 30 ₁ to 30 ₄ are continuously operated.
(Ii) When it is determined that the horizontality (or verticality) of the caisson 10 is not maintained, the operation of the motors 33 of the remaining excavator bearings 30 ₁ to 30 ₄ other than the detection of the vertical displacement difference is performed. Stop.

The control method of each part by the above-mentioned control part 60 is an illustration, and especially when it is judged that the horizontality (or verticality) of the caisson 10 is not maintained, each motor of the excavation pressure bearings 30 ₁ to 30 ₄ Of course, the control method 33 may be changed as appropriate in accordance with the geological condition of the groundwork immediately below the blade edge.

[Action]
Next, a method for sinking the caisson 10 will be described.

<1> Excavation Work As shown in FIG. 1, horizontal excavators 20 _{1 to} 20 ₅ are set on each side of the blade edge of the caisson 10, and excavation pressure bearings 30 ₁ to 30 ₄ are set to the inner corners of the caisson 10. To do.
The horizontal excavators 20 _{1 to} 20 ₅ cooperate with the excavation pressure bearings 30 ₁ to 30 ₄ to excavate the direct base plate at the edge of the caisson 10. At this time, the phase of each horizontal excavator 20 ₁ to 20 ₅ which faces back and forth traveling at a constant speed, also drilled at each drilling Bearing unit 30 ₁ to 30 ₄ is also a constant speed in a diagonal relationship, evenly excavating the entire can do.

The caisson 10 sinks along with the excavation, but most of the weight of the caisson 10 is supported by the ground immediately below the blade edge, so that an excessive load is applied to each of the horizontal excavators 20 _{1 to} 20 ₅ and the excavation pressure bearings 30 ₁ to 30 _4. It does not take.
Similarly, an excessive load is not applied to the feed bolts 54 and the columns 51 that are servo-fed by the horizontal control devices 50 ₁ to 50 ₄ connected to the caisson 10 via the connecting member 13.

Each horizontal excavator 20 _{1 to} 20 ₅ reciprocates along the straight part of the blade edge of the caisson 10 to excavate the straight base board with the blade width of the caisson 10 and discharge the excavated soil to the inside. The excavator bearing pressure machines 30 ₁ to 30 ₄ rotate and excavate the direct base plate at the edge of the corner of the caisson 10.
Although the above-described horizontal excavators 20 _{1 to} 20 ₅ alone are likely to cause excavation residue at the corners of the caisson 10, the caisson can be provided by providing the excavation pressure bearings 30 ₁ to 30 ₄ with a height difference at the corners of the caisson 10. It becomes possible to excavate the direct base plate of the entire blade edge including 10 corners.

Previously, the interior of the caisson 10 leave deploy excavating machine such as a backhoe or bulldozer, excavated soil discharged from the horizontal boring machine 20 ₁ to 20 ₅ and drilling Bearing unit 30 ₁ to 30 ₄ are drilled inside the caisson 10 The soil is discharged to the ground through the shaft 40.
By repeating the above operations, the caisson 1 is sunk while evenly excavating the direct base plate of the blade edge.

While the caisson 10 is sinking, the feed bolts 54 are evenly lowered by the servo control of the motors 55 of the horizontal control devices 50 ₁ to 50 ₄ to follow the caisson 10 sinking.

<2> Caisson Horizontal Control FIG. 10 is a model diagram of the initial caisson 10 sinking. The controller 60 individually includes a plurality of measurements of the caisson 10 from the sensors 56 of the horizontal control devices 50 ₁ to 50 _4. Information on the vertical displacement at the point is input.
When the difference in the amount of subsidence of the caisson 10 per unit time at all points obtained from each sensor 56 is within an allowable range (for example, 1 mm), the control unit 60 has the motors of all the horizontal control devices 50 ₁ to 50 ₄ . 55 and the motors 33 of the excavation bearing pressure machines 30 ₁ to 30 ₄ are continuously operated.

When the elevation of the elevating disk 53 is detected from the sensor 56 as shown by the two-dot chain line in FIG. 9 in only one place among the horizontal control devices 50 ₁ to 50 ₄ , a difference occurs in the vertical displacement amount of the caisson 10. Means that.
When the elevation of the elevating disc 53 is detected, it is determined that the caisson has been settling later than the others, so the controller 60 detects any of the horizontal controls that detected the elevation of the elevating disc 53. At the same time as the operation of the motor 55 of the devices 50 ₁ to 50 ₄ is stopped, the remaining excavation pressure bearings 30 ₁ except for any one of the excavation pressure bearings 30 ₁ to 30 ₄ closest to the point where the rising of the elevating disk 53 is detected. to stop the operation of 30 ₄ of the motor 33. By stopping the operation of the motor 33, the blades 32 come into contact with the ground and resist the caisson 10 from sinking.

While the other remaining excavator bearings 30 ₁ to 30 ₄ are stopped and kept waiting, the motor 33 of any of the excavator bearings 30 ₁ to 30 ₄ that detects the rising of the elevating disk 53 during this period is rotated. Drilling with blades 32.
When all of the horizontal control devices 50 ₁ to 50 ₄ have settled down, the operation of any one of the excavator bearing pressures 30 ₁ to 30 ₄ that has been stopped is resumed.
The caisson 10 subsidence correction work by stopping and resuming the operation of the excavator bearings 30 ₁ to 30 ₄ is repeatedly performed within an arbitrarily set short time while the caisson 10 is subsidizing to continuously sink the caisson 10. Let

  When a part of the blade edge hits a large rock mass or hard ground, the settlement work of the entire caisson is temporarily interrupted, and the large rock mass is operated by individually operating the horizontal excavator 20 or the backhoe. It is better to excavate or hard ground.

  Further, when the caisson 10 is formed in a form divided into a plurality of parts, when the caisson 10 is settled, the connecting material 13 is cut off, and then the feed bolt 54 is returned to the initial state, and the extension caisson 10 is added. Through the process, the feed bolt 54 is connected to the connecting member 13 protruding from the extension caisson 10 and is similarly set.

As described above, according to the present invention, the horizontal control devices 50 ₁ to 50 ₄ monitor the sinking displacement at a plurality of locations of the caisson 10 and brake the caisson when the sinking amount varies. By excavating the lack of excavation and correcting the variation in the amount of subsidence, the caisson can always be subsidized while maintaining high levelness and verticality.
In particular, monitoring the vertical displacement at a plurality of locations of the caisson 10 within a preset subsidence amount (for example, 1 mm) and the work for eliminating the difference when a difference occurs in the vertical displacement in a short time. By performing it repeatedly, accurate attitude control of the caisson 10 is possible, and the caisson 10 can be continuously sunk while maintaining high horizontality and verticality.
Further, since the variation in the amount of displacement of the caisson 10 is corrected within a very short time, the load due to the amount of the caisson 10 hardly acts on the horizontal control devices 50 ₁ to 50 ₄ .

In the present invention, the horizontal excavator 20 may be omitted, and the direct base plate of the blade edge of the caisson 10 may be excavated with only the excavator bearing 30.
Further, the connecting member 13 may be omitted and the feed bolt 54 may be directly connected to the caisson 10.

It is explanatory drawing of Example 1 which concerns on invention, Comprising: The top view of the caisson which fractured | ruptured one part Sectional view of II-II in FIG. Top view of excavator bearing blades Sectional view of IV-IV in Fig. 3 Partial enlarged view of caisson corner viewed from ground side Sectional view of VI-VI in FIG. Perspective view of the horizontal control device Vertical section of the upper part of the horizontal control device Partial enlarged view of the horizontal control device Explanatory drawing of attitude control method when caisson is laid

Explanation of symbols

10... Caisson 11... Caisson outlet 12... Caisson shelf 13... Linking material 20 _{1 to} 20 ₅ Horizontal excavator 30 ₁ to 30 ₄ Excavator 31... Vertical axis 32... Blade 33... Radiation blade 34 ... Excavation bit 40 ... Vertical shafts 50, 50 ₁ to 50 ₄ ... Horizontal control device 51 ··············································································································· Height adjustment stand 60... Control unit

Claims (4)

A caisson excavator for excavating a direct base plate of a caisson blade with a horizontal excavator disposed on the lower surface of the caisson blade so as to reciprocate along the blade,
Excavation supporter arranged at a plurality of caisson locations with a level difference from the horizontal excavator,
A plurality of horizontal control devices arranged around the ground caisson;
It consists of a control unit that controls the excavation bearing pressure machine and a horizontal control device,
The horizontal control device comprises monitoring means for detecting the vertical displacement of the caisson,
The control unit is configured to be able to individually control the operation of the excavator bearing pressure so as to eliminate the difference in vertical displacement of the caisson when there is a difference in detection information of the plurality of monitoring means. ,
Caisson drilling rig.   In Claim 1, the excavation supporter is provided integrally with a vertical axis extending downward from the blade edge of the caisson and a lower portion of the vertical axis, and functions as an excavation blade when rotating and is in contact with the ground when rotation is stopped. A caisson excavator comprising a blade functioning as a resistance member for preventing the caisson from sinking and a motor for rotating the longitudinal axis, the motor being electrically connected to the control unit. .   3. The horizontal control device according to claim 1, wherein the horizontal control device rotates a feed bolt whose one end is connected to a caisson, a lifting / lowering disk that is screwed into the feeding bolt and allows vertical displacement, and the lifting / lowering disk is rotated. A monitoring means comprising a motor and a sensor for detecting the vertical displacement of the elevating disk is provided, and the detection signal of the sensor is input to the control unit, and the control unit is electrically connected based on the detection signal of the sensor. A caisson excavator, wherein the connected motor is servo-controlled.   4. The caisson excavator according to claim 1, wherein the horizontal control device is mounted on a stationary member standing upright around the caisson.

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