JP6920223B2 - Caisson rotation suppression device, caisson rotation suppression system, and caisson laying method - Google Patents

Description

The present invention relates to a device and a system for suppressing the rotation of a caisson submerged in the ground around an axis extending in the vertical direction, and a method for submerging the caisson.

Patent Document 1 discloses a method for correcting the inclination of a caisson submerged in the ground. Paragraphs 0004 and FIG. 8 of Patent Document 1 disclose, as a prior art, that a guide roller is pressed against the outer periphery of a caisson by a hydraulic jack, and the inclination of the caisson is controlled by pressing the guide roller. Further, a technique similar to this is also disclosed in Patent Document 2.

Japanese Patent No. 3814788 JP-A-64-017932

However, with the techniques disclosed in Patent Documents 1 and 2, it is difficult to suppress the rotation (yawing) of the caisson around the axis extending in the vertical direction when the caisson is submerged in the ground. Therefore, it was difficult to ensure the accuracy of caisson laying.
In view of such an actual situation, an object of the present invention is to lay a caisson in the ground with high accuracy.

Therefore, the caisson rotation suppressing device according to the present invention is a device that suppresses the rotation of a caisson submerged in the ground around an axis extending in the vertical direction. The rotation suppressing device for a caisson according to the present invention includes a guide member that is detachably attached to the outer peripheral surface of the caisson and extends in the vertical direction, and a pair of expandable and contractible first members that are arranged so as to sandwich the guide member in the circumferential direction of the caisson. It has one jack and a support portion that is fixed to the ground and supports the first jack.
The caisson rotation suppression system according to the present invention is a system that has a plurality of the above-mentioned caisson rotation suppression devices and suppresses the rotation of the caisson around the axis extending in the vertical direction. In the caisson rotation suppression system according to the present invention, a plurality of rotation suppression devices are provided at intervals in the circumferential direction of the caisson.

The method for submerging a caisson according to the present invention is a method for submerging a caisson in the ground using the above-mentioned caisson rotation suppression system (rotation suppression device). The method for submerging a caisson according to the present invention includes a caisson subsidence step in which a caisson equipped with a guide member is submerged in the ground, and a guide member in which the guide member is separated from the caisson and the guide member is moved ascending after the caisson subsidence step. Includes ascending movement steps.

According to the present invention, a pair of first jacks are arranged so as to sandwich the guide member in the circumferential direction of the caisson. Therefore, the rotation of the caisson around the axis extending in the vertical direction is suppressed by the pair of first jacks via the guide member, so that the caisson can be sunk in the ground with high accuracy.

Top view of the rotation suppression system according to the first embodiment of the present invention FIG. 1 is a cross-sectional view taken along the line I-I. Partial enlarged view of part α of FIG. The figure which shows the shortened state of the 1st jack in the 1st Embodiment. The figure which shows the method of laying a caisson in the said 1st Embodiment. The figure which shows the method of laying a caisson in the said 1st Embodiment. The figure which shows the method of laying a caisson in the said 1st Embodiment. The figure which shows the method of laying a caisson in the said 1st Embodiment. The figure which shows the method of laying a caisson in the said 1st Embodiment. The figure which shows the method of laying a caisson in the said 1st Embodiment. Top view of the outer formwork and the inner formwork in the first embodiment Top view of the rotation suppression system according to the second embodiment of the present invention The figure which shows the rotation suppression system in 3rd Embodiment of this invention. Bird's-eye view of the rotation suppression device according to the fourth embodiment of the present invention Top view of the rotation suppression system according to the fifth embodiment of the present invention Partially enlarged view of part β of FIG. Top view of the rotation suppression device according to the sixth embodiment of the present invention The figure which shows the schematic structure of the guide member in 7th Embodiment of this invention. The figure which shows an example of the operation state display part in 8th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a top view of the rotation suppression system 8 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a partially enlarged view of a portion α of FIG. Here, in FIG. 3, the retaining walls 11 and 12 and the target 80 are not shown. For convenience of explanation, as shown in FIGS. 1 and 2, top and bottom, front and back, and left and right are defined, respectively, and will be described below.

In the present embodiment, an example in which the caisson rotation suppression device, the caisson rotation suppression system, and the caisson subsidence method according to the present invention are applied to the construction of a shaft will be described, but the caisson rotation suppression device and the caisson according to the present invention will be described. The application example of the rotation suppression system and the caisson subsidence method is not limited to this.

The shaft is composed of a cylindrical caisson (caisson skeleton) 100. The caisson 100 includes a plurality of cylindrical lots (construction lots) 20. In the construction of the shaft in the present embodiment, one lot 20 is constructed, the lot 20 is subsided in the ground, and then a new lot 20 is constructed on the lot 20. In this way, by repeating the construction of the lot 20 and the subsidence into the ground, a cylindrical shaft extending in the vertical direction is constructed in the ground.

Here, in FIG. 2, among the plurality of lots 20 constituting the caisson 100, the lot 20 _{n-2 located at the n-2nd position from the bottom and the lot 20 n-1} located at the n-1th position from the bottom are shown. _{And the lot 20 n} located at the nth position from the bottom are shown (n: a natural number of 3 or more).

The caisson 100 (lot 20) is made of concrete. Of the outer peripheral portion of the caisson 100 (lot 20), a portion to which the guide member 3 (specifically, the first member 31), which will be described later, is detachably attached, has a predetermined interval (for example, a range of 50 cm to 1 m) in the vertical direction. A plurality of anchor members 21 are embedded at intervals of the inside).

In the present embodiment, it will be described below assuming that the caisson 100 is subsided in the ground by its own weight while excavating the ground 10 by the pneumatic caisson method. Since the pneumatic caisson method is well known as disclosed in, for example, Japanese Patent Application Laid-Open No. 2015-040458 and Japanese Patent Application Laid-Open No. 2015-108171, the description thereof will be omitted.

A cylindrical retaining wall 11 is formed on the ground 10 so as to surround the construction site of the shaft (the place where the caisson 100 is sunk). The earth retaining wall 11 is formed of, for example, a steel sheet pile. A portion of the ground 10 surrounded by the retaining wall 11 is dug down from the ground 10a to form a columnar space 13.

In the present embodiment, a total of four locations in the front, rear, left, and right sides of the columnar space 13 are expanded outward in the radial direction to form an expansion space 13a. A U-shaped retaining wall 12 is formed on the ground 10 so as to partition the extended space 13a. The retaining wall 12 is formed by, for example, the SMW method (registered trademark).

The rotation suppression system 8 has a plurality of (four in this embodiment) rotation suppression devices 1. In the rotation suppression system 8 of the present embodiment, four rotation suppression devices 1 are provided so as to correspond to a total of four locations in the front, rear, left, and right of the caisson 100. In the present embodiment, four rotation suppression devices 1 are provided at intervals in the circumferential direction of the caisson 100. In the present embodiment, the number of rotation suppression devices 1 constituting the rotation suppression system 8 is four, but the number of rotation suppression devices 1 constituting the rotation suppression system 8 is not limited to four, and two. It can be three, or five or more. That is, the number of rotation suppression devices 1 constituting the rotation suppression system 8 is arbitrary as long as it is plural. However, the number of rotation suppression devices 1 constituting the rotation suppression system 8 is preferably 4 × N (N: 1 or more natural numbers) or 3 × N. Further, in the rotation suppression system 8, it is preferable that a plurality of rotation suppression devices 1 are provided at equal intervals (that is, at equal intervals) in the circumferential direction of the caisson 100.

In the rotation suppression system 8 of the present embodiment, the rotation suppression device 1 is provided every 90 ° around the axis P extending in the vertical direction of the caisson 100. That is, in the present embodiment, a plurality of rotation suppression devices 1 are provided at equal intervals in the circumferential direction of the caisson 100. Here, the "axis line P" is a line corresponding to the central axis of the caisson 100 and is a virtual line.

The rotation suppression system 8 and the rotation suppression device 1 constituting the system suppress the rotation (yaw) around the axis P of the caisson 100 when the caisson 100 is subsided in the ground 10 (in the ground). ..
The rotation suppressing device 1 has a U-shaped frame 2 in a top view, a guide member 3 extending in the vertical direction, a pair of first jacks 4 and 5, and a second jack 6.

Most of the frame body 2 is arranged in the expansion space 13a. The frame body 2 is composed of beam members 25 to 27.
The beam member 25 is arranged in the expansion space 13a, extends horizontally along the tangential direction (top view) of the retaining wall 11, and is fixed to the retaining wall 12. The base end portion 61 of the second jack 6 is connected to the central portion in the longitudinal direction of the beam member 25.

The base end portion of the beam member 26 is connected to one end of the beam member 25 and extends horizontally toward the space 13, and the base end portion 41 of the first jack 4 is connected to the tip end side. The beam member 26 is fixed to the earth retaining walls 11 and 12. The tip end portion of the beam member 26 (the portion to which the base end portion 41 of the first jack 4 is connected) is located in the space 13 radially inside the earth retaining wall 11.

The base end portion of the beam member 27 is connected to the other end of the beam member 25 and extends horizontally toward the space 13, and the base end portion 51 of the first jack 5 is connected to the tip end side. The beam member 27 is fixed to the earth retaining walls 11 and 12. The tip end portion of the beam member 27 (the portion to which the base end portion 51 of the first jack 5 is connected) is located in the space 13 radially inside the earth retaining wall 11.

The guide member 3 includes a first member 31 and a second member 32 extending in the vertical direction. The length of one first member 31 in the longitudinal direction is longer than the length of one lot 20 in the vertical direction. The length of one second member 32 in the longitudinal direction is longer than the length of one lot 20 in the vertical direction. Therefore, the longitudinal length of one guide member 3 is longer than the vertical length of one lot 20.

The first member 31 has a rectangular cross section and is made of, for example, steel. The outer peripheral surface of the caisson 100 (side surface 31a) of the first member 31 is in contact with the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20) via the bolt 33 and the anchor member 21. It is detachably attached to the outer peripheral surface 20a) of the lot 20. Here, the first member 31 is formed with a bolt insertion hole 34 having a stepped portion 34a to which the head of the bolt 33 can come into contact. Further, the anchor member 21 is formed with a female threaded portion into which the male threaded portion of the bolt 33 can be screwed.

In the present embodiment, the second member 32 is composed of a square steel pipe 35 extending in the vertical direction and a filler (for example, concrete) 36 filled in the square steel pipe 35. The second member 32 is detachably attached to the first member 31 via a bolt 37 in a state where one side thereof is in contact with the other side of the first member 31. Here, the second member 32 is formed with a bolt insertion hole 38 having a stepped portion 38a with which the head of the bolt 37 can come into contact. Further, the first member 31 is formed with a female threaded portion into which the male threaded portion of the bolt 37 can be screwed.

Therefore, in the guide member 3, the first member 31 and the second member 32 are fastened with bolts 37. Further, the guide member 3 is detachably attached to the outer peripheral surface of the caisson 100 (the outer peripheral surface 20a of the lot 20) via the bolt 33 and the anchor member 21.

In the present embodiment, one or more convex portions (in other words, keys) 39 extending in the vertical direction are formed on the side surface 31a on one side of the first member 31 so as to project from the side surface 31a. On the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20), a concave portion (in other words, a key groove) 22 extending in the vertical direction is formed so as to correspond to the convex portion 39. The concave portion 22 can accommodate the convex portion 39. By accommodating the convex portion 39 in the concave portion 22, the movement of the first member 31 with respect to the caisson 100 in the circumferential direction of the caisson 100 can be suppressed. However, if the movement of the first member 31 with respect to the caisson 100 in the circumferential direction of the caisson 100 is sufficiently suppressed by fastening the first member 31 and the caisson 100 with the bolt 33, the above-mentioned convexity It is not necessary to form the portion 39 and the recess 22.

The first jacks 4 and 5 are arranged so as to sandwich the guide member 3 (specifically, the second member 32) in the circumferential direction of the caisson 100. The first jacks 4 and 5 are hydraulic jacks, which extend horizontally along the tangential direction (top view) of the caisson 100. Further, the first jacks 4 and 5 can be expanded and contracted horizontally along the tangential direction (top view) of the caisson 100.

The base end portion 41 of the first jack 4 is fixed to the beam member 26. An endless roller (for example, a chill tank (trade name)) is provided on the tip end portion 42 of the first jack 4 as an example of the first rolling means 43. The first rolling means 43 can come into contact with the side surface 32a of the second member 32 on the side facing the first jack 4. In the present embodiment, when the second member 32 moves in the vertical direction with respect to the first jack 4, the first rolling means 43 is in contact with the side surface 32a of the second member 32, and the first rolling is performed. The moving means 43 can roll on the side surface 32a of the second member 32.

The base end portion 51 of the first jack 5 is fixed to the beam member 27. An endless roller (for example, a chill tank (trade name)) is provided on the tip end portion 52 of the first jack 5 as an example of the first rolling means 53. The first rolling means 53 can come into contact with the side surface 32b of the second member 32 on the side facing the first jack 5. In the present embodiment, when the second member 32 moves in the vertical direction with respect to the first jack 5, the first rolling means 53 is in contact with the side surface 32b of the second member 32, and the first rolling is performed. The moving means 53 can roll on the side surface 32b of the second member 32.

FIG. 3 shows a state in which the caisson 100 and the guide member 3 are located at the reference position (design position) when the caisson 100 is submerged in the ground.
In the present embodiment, when the caisson 100 and the guide member 3 are located at this reference position, the second member 32 is located at the central position between the first jacks 4 and 5 as shown in FIG. At this time, each of the first jacks 4 and 5 is in the most extended state (the most extended state and cannot be further extended). Therefore, if rotation around the axis P of the caisson 100 occurs while the caisson 100 is subsided in the ground, one of the first jacks 4 and 5 is shortened via the guide member 3. , The other remains in the fully extended state. Here, in FIG. 4, when the rotation around the axis P of the caisson 100 occurs during the subsidence of the caisson 100, the first jack 4 remains in the most extended state and the first jack 5 is shortened. Shows the state of At this time, the tip end portion 42 (first rolling means 43) of the first jack 4 is separated from the side surface 32a of the second member 32. Therefore, the pressing force from the first jack 4 does not act on the first jack 5, and therefore, the first jack 5 need only resist the pressing force from the second member 32. Regarding the first jacks 4 and 5, the pressure and stroke of each jack are controlled so that each jack maintains the maximum extended state.

The second jack 6 is a hydraulic jack and extends horizontally along the radial direction of the caisson 100. Further, the second jack 6 can be expanded and contracted horizontally along the radial direction of the caisson 100.
The base end portion 61 of the second jack 6 is fixed to the central portion in the longitudinal direction of the beam member 25 and is supported by the beam member 25. The tip portion 62 of the second jack 6 faces the side surface 32c on the other side of the second member 32.

An endless roller (for example, a chill tank (trade name)) is provided on the tip portion 62 of the second jack 6 as an example of the second rolling means 63. The second rolling means 63 can come into contact with the side surface 32c on the other side of the second member 32. In the present embodiment, when the second member 32 moves in the vertical direction with respect to the second jack 6, the second rolling means 63 is in contact with the side surface 32c of the second member 32, and the second rolling means 63 is in contact with the side surface 32c of the second member 32. The moving means 63 can roll on the side surface 32c of the second member 32.

In the present embodiment, as shown in FIG. 3, when the caisson 100 and the guide member 3 are located at the reference positions when the caisson 100 is submerged in the ground, the second jack 6 is in the most extended state (the most extended state). It is in a state where it cannot be further extended). Therefore, if the caisson 100 is tilted (tilted back and forth and left and right) while the caisson 100 is subsided in the ground, the second jack 6 on the tilted side is shortened via the guide member 3. However, the remaining second jack 6 remains in the fully extended state. At this time, the tip portion 62 (second rolling means 63) of the remaining second jack 6 is separated from the side surface 32c of the second member 32. Therefore, the pressing force from the remaining second jack 6 does not act on the second jack 6 shortened by the inclination of the caisson 100 described above. Regarding the second jack 6, the pressure / stroke control of the second jack 6 is performed so that the second jack 6 maintains the maximum extension state.

Here, in the present embodiment, the frame body 2 corresponds to the "support portion" of the present invention. The frame body 2 is fixed to the ground 10 via the retaining walls 11 and 12 to support the first jacks 4 and 5 and the second jack 6.

As shown in FIGS. 1 and 2, a target 80 is provided at the top end of the second member 32 of each of the four guide members 3. The target 80 is composed of a reflecting prism or the like.
An automatic tracking type goniometer (total station) (not shown) is provided on the ground 10a. This goniometer can automatically collimate each target 80. Further, the above-mentioned goniometer can measure the distance from itself to each target 80 and the collimation angle of each target 80.

In the present embodiment, the inclination, rotation (yaw), and horizontal displacement of the guide member 3 and the caisson 100 can be measured by collimating each target 80 with the above-mentioned distance measuring angle meter. Therefore, the caisson 100 can be laid down while performing high-precision displacement surveying of the caisson 100 in real time by the above-mentioned range-finding goniometer.

In the present embodiment, a hydraulic circuit for supplying flood control to each of the first jacks 4, 5 and the second jack 6 is separately provided for each jack. A relief valve is provided in the middle of each hydraulic circuit. This relief valve is closed when the oil pressure in the hydraulic circuit is less than the predetermined pressure value, but when the oil pressure in the hydraulic circuit becomes more than the predetermined pressure value, the valve is opened to reduce the oil pressure (that is,). , To let the oil flow out of the hydraulic circuit). Here, the predetermined pressure value is a threshold value set for the purpose of protecting the hydraulic circuit.

In the present embodiment, when the force acting on the first jack 4 or the first jack 5 from the second member 32 becomes a predetermined value or more when the caisson 100 is submerged in the ground, the bolt 37 breaks. For example, in the state shown in FIG. 4, when the force acting on the first jack 5 from the second member 32 becomes a predetermined value or more, the bolt 37 breaks. Therefore, even if an excessive rotational force is generated around the axis P of the caisson 100 when the caisson 100 is submerged in the ground, the bolt 37 is broken by the rotational force (shear force) with respect to the second member 32. The first member 31 slides in the circumferential direction of the caisson 100. Therefore, damage to the caisson 100 itself due to the generation of the rotational force (particularly damage at the installation location of the anchor member 21 in the caisson 100) can be prevented.

Therefore, when a rotational force is generated around the axis P of the caisson 100 when the caisson 100 is submerged in the ground, if the rotational force acts relatively slowly, the first jacks 4 and 5 are used. , It is possible to suppress the rotation of the caisson 100 around the axis P. At this time, if the above-mentioned rotational force is excessive and the oil pressure in the above-mentioned hydraulic circuit becomes equal to or higher than a predetermined pressure value, the above-mentioned relief valve can be opened to release the oil pressure in the hydraulic circuit. ..

Further, when an excessive rotational force is generated around the axis P of the caisson 100 when the caisson 100 is submerged in the ground, the first jacks 4 and 5 are in the shortest state (the shortest state, and further shortening is possible. If the rotational force acts at a speed faster than the shortening speed of the first jacks 4 and 5, the first jacks 4 and 5 cannot cope with the situation. When the first jacks 4 and 5 cannot cope with this, when the force acting on the first jack 4 or the first jack 5 from the second member 32 becomes a predetermined value or more, the bolt 37 is broken and the second jack 37 is broken. By sliding the first member 31 with respect to the member 32 in the circumferential direction of the caisson 100, damage to the caisson 100 itself is prevented.

Next, a method of submerging the caisson 100 in the ground 10 (in the ground) will be described with reference to FIGS. 5 to 11 in addition to FIGS. 1 to 4 described above.
5 to 10 are views showing a method of laying the caisson 100 in the present embodiment. FIG. 11 is a top view of the outer formwork 71 and the inner formwork 72 in the present embodiment.

Here, FIGS. 2 and 5 to 10 show that the _{caisson 100 including a plurality of lots 20 n-2} , 20 _n-1 , and 20 _n already constructed is subsided in the ground and then placed on _{the lot 20 n.} It shows that a new lot 20 _{n + 1 will be constructed.} By repeating the construction of the lot 20 and the subsidence into the ground in this way, a cylindrical shaft extending in the vertical direction can be constructed in the ground.

In the present embodiment, first, as shown in FIGS. 2 and 5, a guide member 3 (first member 31 and second member 32) is attached to the upper end portion _{of the lot 20 n-1 and the lot 20 n.} Then, the _{caisson 100 including the lots 20 n-2} , 20 _n-1 , and 20 _n is subsided in the ground by a predetermined depth (caisson subsidence step). Here, in the present embodiment, the predetermined depth is within the range of 50 cm to 1 m, but the predetermined depth is not limited to this. The predetermined depth can be set based on the groundwater level. Specifically, the predetermined depth can be set so that the guide member 3 (first member 31 and second member 32) is not buried in the groundwater in the caisson subsidence step.

In this caisson subsidence step, when rotation around the axis P of the caisson 100 occurs, one of the first jacks 4 and 5 is shortened via the guide member 3, and the other remains in the fully extended state. Become. For the shortened ones of the first jacks 4 and 5, the guide member 3 is pressed by the stability force to return to the maximum extension state, so that the rotation around the axis P of the caisson 100 is counteracted. The rotation of the caisson 100 in the caisson subsidence step is suppressed.

Further, in the caisson subsidence step, when the caisson 100 is tilted (tilted back and forth and left and right), the second jack 6 on the tilted side is shortened via the guide member 3, and the remaining second jack is used. 6 remains in the fully extended state. For the shortened second jack 6, the guide member 3 is pressed by the stability force to return to the maximum extension state to prevent the inclination of the caisson 100 from being corrected. Therefore, in the caisson subsidence process. The inclination of the caisson 100 is suppressed.

Next, the bolt 37 is loosened to remove the second member 32 from the first member 31, and then the bolt 33 is loosened to remove the first member 31 from the lots 20 _n-1 and 20 _n . That is, the guide member 3 is separated from the _{lots 20 n-1} and 20 _n. Then, as shown in FIG. 6, the guide member 3 (first member 31 and second member 32) is moved ascending by a predetermined height (guide member ascending and moving step). A lifting device such as a crane can be used for the ascending movement of the guide member 3. Here, in the present embodiment, the predetermined height is within the range of 50 cm to 1 m, but the predetermined height is not limited to this. The predetermined height can be set according to the predetermined depth described above.

Next, as shown in FIG. 6, the guide member 3 (first member 31 and second member 32) is mounted _{on the lot 20 n.} At the time of mounting the guide member 3, the first member 31 is first _{attached to the lot 20 n} via the bolt 33, and then the second member 32 is attached to the first member 31 via the bolt 37. The attached second member 32 is located between the first jacks 4 and 5, as shown in FIG.

After that, as shown in FIGS. 2, 5 and 6, the _{caisson 100 including a plurality of lots 20 n-2} , 20 _n-1 , 20 _n already constructed is subsided into the ground, and a guide is provided. The member 3 is _{separated from the lot 20 n} and moved up, and the guide member 3 is _{mounted on the lot 20 n} until the state shown in FIG. 7 (that is, the lower end of the guide member 3 is in the lot 20 _n ). Repeat (until it is attached to the upper end).

Next, as shown in FIG. 8, a plurality of anchor members 21 are detachably attached to the first member 31.
Next, as shown in FIGS. 9 and 11, the outer formwork 71 and the inner formwork 72 are installed so as to partition the cylindrical lot construction planned area 29 on the _{lot 20 n.} In the present embodiment, a part of the outer form 71 is composed of the first member 31. Here, the outer formwork 71 corresponds to the "caisson construction formwork" of the present invention, and the first member 31 (guide member 3) constitutes a part of the outer formwork 71.

Then, by pouring concrete into the outer frame 71 and inner mold 72 and lot 20 _n upper surface Lots building plan area 29 partitioned by the, the new lot on Lot 20 _n 20 _{n + 1} Build (lot construction process (caisson construction process)). As a result, a plurality of anchor members 21 are embedded in the outer peripheral portion _{of the lot 20 n + 1.}

After the concrete of the lot 20 _{n + 1} is hardened, as shown in FIG. 10, the inner formwork 72 and the portion of the outer formwork 71 other than the first member 31 are removed.
By repeating the construction of the lot 20 and the subsidence of the caisson 100 into the ground as described above, a cylindrical shaft extending in the vertical direction can be constructed in the ground.
It is possible to construct a shaft having a diameter of several tens of meters, for example, by using the caisson 100 subsidence method shown in FIGS. 1 to 11.

In the present embodiment, the caisson 100 can be safely controlled by controlling the pressure and stroke of the first jacks 4 and 5 and the second jack 6 by remote control.

According to the present embodiment, the rotation suppression device 1 is a device that suppresses the rotation of the caisson 100 submerged in the ground around the axis P extending in the vertical direction. The rotation suppression device 1 is arranged so as to sandwich the guide member 3 that is detachably attached to the outer peripheral surface of the caisson 100 (the outer peripheral surface 20a of the lot 20) and extends in the vertical direction, and the guide member 3 in the circumferential direction of the caisson 100. It has a pair of stretchable first jacks 4 and 5 and a support portion (frame body 2) fixed to the ground 10 and supporting the first jacks 4 and 5. Therefore, the rotation of the caisson 100 around the axis P is suppressed by the pair of first jacks 4 and 5 via the guide member 3, so that the caisson 100 can be sunk in the ground with high accuracy.

Further, according to the present embodiment, the caisson 100 (lot 20) is made of concrete. The caisson 100 (lot 20) has an anchor member 21 provided on the outer peripheral portion thereof. The guide member 3 is detachably attached to the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20) via the anchor member 21. Therefore, when the guide member 3 is attached to the caisson 100, the guide member 3 and the caisson 100 can be well integrated.

Further, according to the present embodiment, the guide member 3 extends in the vertical direction, one side abuts on the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20), and the outer peripheral surface of the caisson 100 (lot) via the anchor member 21. A first member 31 that is detachably attached to the outer peripheral surface 20a) of 20 and a second member 32 that is attached to the other side of the first member 31 and extends in the vertical direction are included. The pair of first jacks 4 and 5 are arranged so as to sandwich the second member 32 in the circumferential direction of the caisson 100. Therefore, the guide member 3 can be composed of two members that can be separated from each other.

Further, according to the present embodiment, the first member 31 and the second member 32 are fastened with bolts 37. When the force acting on the first jack 4 or the first jack 5 from the second member 32 becomes a predetermined value or more, the bolt 37 breaks. As a result, even if an excessive rotational force is generated around the axis P of the caisson 100 when the caisson 100 is submerged in the ground, the bolt 37 is broken by the rotational force (shear force) with respect to the second member 32. The first member 31 slides in the circumferential direction of the caisson 100. Therefore, damage to the caisson 100 itself due to the generation of the rotational force (particularly damage at the installation location of the anchor member 21 in the caisson 100) can be prevented.

Further, according to the present embodiment, the base end portions 41 and 51 of the first jacks 4 and 5 are fixed to the support portion (frame body 2). The first rolling means 43 and 53 are provided at the tip portions 42 and 52 of the first jacks 4 and 5. The first rolling means 43 and 53 can come into contact with the side surfaces 32a and 32b of the second member 32. When the second member 32 moves in the vertical direction with respect to the first jacks 4 and 5, the first rolling means 43 and 53 are in contact with the side surfaces 32a and 32b of the second member 32. The rolling means 43 and 53 can roll on the side surfaces 32a and 32b of the second member 32. Therefore, when the guide member 3 moves in the vertical direction with respect to the first jacks 4 and 5, the first rolling means 43 and 53 roll to smoothly guide the movement of the guide member 3. be able to.

Further, according to the present embodiment, when the second member 32 (guide member 3) is located at the center position between the pair of first jacks 4 and 5 (see FIG. 3), the pair of first jacks 4 and 5 Each of 5 is in the most extended state. Therefore, for example, as shown in FIG. 4, when the rotation around the axis P of the caisson 100 occurs during the subsidence of the caisson 100, the first jack 4 remains in the most extended state and the first jack 4 remains in the fully extended state. When the 1 jack 5 is shortened, the tip portion 42 (first rolling means 43) of the first jack 4 is separated from the side surface 32a of the second member 32 of the guide member 3. Therefore, it is possible to prevent the pressing force from the first jack 4 from acting on the first jack 5, and the load on the first jack 5 can be reduced accordingly.

Further, according to the present embodiment, in the rotation suppressing device 1, the base end portion 61 is fixed and supported by the support portion (frame body 2), and the tip end portion 62 faces the side surface 32c on the other side of the second member 32. It has a stretchable second jack 6. Therefore, the inclination of the caisson 100 can be suppressed by the second jack 6.

Further, according to the present embodiment, the second rolling means 63 is provided at the tip end portion 62 of the second jack 6. The second rolling means 63 can come into contact with the side surface 32c on the other side of the second member 32. When the second member 32 moves in the vertical direction with respect to the second jack 6, the second rolling means 63 is in contact with the side surface 32c on the other side of the second member 32. 63 can roll on the side surface 32c on the other side of the second member 32. Therefore, when the guide member 3 moves in the vertical direction with respect to the second jack 6, the second rolling means 63 rolls, so that the movement of the guide member 3 can be smoothly guided.

Further, according to the present embodiment, a convex portion 39 is formed on the side surface 31a on one side of the first member 31. A recess 22 for accommodating the convex portion 39 is formed on the outer peripheral surface of the caisson 100 (the outer peripheral surface 20a of the lot 20). Therefore, by accommodating the convex portion 39 in the concave portion 22, the movement of the first member 31 with respect to the caisson 100 in the circumferential direction of the caisson 100 can be suppressed.

Further, according to the present embodiment, the first member 31 (guide member 3) constitutes a part of the caisson construction formwork (outer formwork 71). Therefore, the first member 31 (guide member 3) can be used not only as a guide for caisson subsidence but also as a formwork for concrete placement.

Further, according to the present embodiment, the plurality of guide members 3 are detachably attached to the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20) at intervals in the circumferential direction of the caisson 100 (lot 20). The plurality of guide members 3 can project radially outward from the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20). Therefore, it is possible to guide the caisson 100 when it sinks at a plurality of locations in the circumferential direction of the caisson 100.

Further, according to the present embodiment, the caisson 100 (lot 20) has a cylindrical shape. By using the rotation suppressing device 1 when the cylindrical caisson 100 is sunk, the rotation of the caisson 100 around the axis P can be satisfactorily suppressed.

Further, according to the present embodiment, the second member 32 is composed of a square steel pipe 35 extending in the vertical direction and a filler 36 filled in the square steel pipe 35. Therefore, the caisson 100 can be sunk with high accuracy by using the highly rigid guide member 3.

Further, according to the present embodiment, the rotation suppression system 8 is a system that has a plurality of rotation suppression devices 1 and suppresses the rotation of the caisson 100 around the axis P extending in the vertical direction. In the rotation suppression system 8, a plurality of rotation suppression devices 1 are provided at intervals in the circumferential direction of the caisson 100. Therefore, the plurality of rotation suppressing devices 1 can cooperate to suppress the rotation of the caisson 100 when the caisson 100 sinks.

Further, according to the present embodiment, the method of submerging the caisson 100 is a method of submerging the caisson 100 in the ground by using the rotation suppressing device 1 (rotation suppressing system 8) of the caisson 100. The method of submerging the caisson 100 includes a caisson subsidence step (see FIG. 5) in which the caisson 100 to which the guide member 3 is attached is submerged in the ground, and a guide member 3 is separated from the caisson 100 after the caisson subsidence step. It includes a guide member ascending / moving step (see FIG. 6) for ascending / moving the member 3. Therefore, the rotation suppressing device 1 having a simple structure can be used to easily suppress the rotation of the caisson 100 around the axis P when the caisson 100 sinks.

Further, according to the present embodiment, the method of submerging the caisson 100 includes a lot construction step (caisson construction step) of constructing a new lot 20 above the caisson 100 after the guide member ascending movement step (FIG. 6) (FIG. 6). 7 to 11). In this way, the caisson 100 composed of the plurality of lots 20 can be efficiently constructed.

FIG. 12 is a top view of the rotation suppression system 8'in the second embodiment of the present invention.
The points different from the above-described first embodiment will be described.

In the present embodiment, the above-mentioned expansion space 13a is not formed. An abdominal raising member 90 made of H-shaped steel of a ring beam is provided on the inner peripheral surface of the earth retaining wall 11. The abdominal member 90 functions as a substitute for the above-mentioned beam member 25 and constitutes the frame body 2'. That is, the frame body 2'of the rotation suppressing device 1'that constitutes the rotation suppressing system 8'is composed of the above-mentioned beam members 26 and 27 and the abdominal raising member 90.

Here, in the present embodiment, the frame body 2'corresponds to the "support portion" of the present invention. The frame body 2'is fixed to the ground 10 via a retaining wall 11 to support the first jacks 4, 5 and the second jack 6.

FIG. 13 is a diagram showing a rotation suppression system 8 ”in the third embodiment of the present invention.
The points different from the above-described first embodiment will be described.
In this embodiment, the retaining walls 11 and 12 are not formed. Further, the space 13 and the extended space 13a are not formed.

In the above-described first embodiment, the frame body 2, the first jacks 4 and 5, and the second jack 6 constituting the rotation suppression device 1 of the rotation suppression system 8 are located below the ground 10a.
On the other hand, in the present embodiment, the frame body 2, the first jacks 4 and 5, and the second jack 6 constituting the rotation suppression device 1 "of the rotation suppression system 8" are located above the ground 10a. ing.

In the present embodiment, a support column 95 for supporting the frame body 2 is erected on the ground 10a.
Here, in the present embodiment, the frame body 2 and the support column 95 correspond to the "support portion" of the present invention. The frame body 2 and the support column 95 are fixed to the ground 10 and support the first jacks 4 and 5 and the second jack 6.

FIG. 14 is a bird's-eye view ^{of the rotation suppression device 1 III according to} the fourth embodiment of the present invention. Note that the target 80 is not shown in FIG.
The points different from the above-described first embodiment will be described.

In the present embodiment, the above-mentioned expansion space 13a is not formed. Frame 2 constituting the rotation suppression device 1 ^III of rotation suppression system 8 ^III is fixed through the earth retaining wall 11 and the connecting member 97 to the ground, to support the first jack 5 and the second jack 6 ..

FIG. 15 is a top view ^{of the rotation suppression system 8 IV according to} the fifth embodiment of the present invention. FIG. 16 is a partially enlarged view of the portion β of FIG. Here, in FIG. 15, the retaining walls 11 and 12 and the target 80 are not shown.
The points different from the above-described first embodiment will be described.

In the present embodiment, a total of three locations in the circumferential direction of the columnar space 13 are expanded outward in the radial direction to form the expansion space 13a. A U-shaped retaining wall 12 is formed on the ground 10 so as to partition the extended space 13a.

The rotation suppression system 8 ^IV has a plurality of rotation suppression devices 1 ^IV (three in this embodiment). In the rotation suppression system 8 ^{IV of the present embodiment, three rotation suppression devices 1 IV} are provided so as to correspond to a total of three locations in the circumferential direction of the caisson 100. In the rotation suppression system 8 ^{IV of the present embodiment, the rotation suppression device 1 IV} is provided at every 120 ° around the axis P extending in the vertical direction of the caisson 100. That is, in the present embodiment, the three rotation suppression devices 1 ^IV are provided at equal intervals in the circumferential direction of the caisson 100.

In the present embodiment, the rotation suppressing device 1 ^IV does not have the above-mentioned second jack 6 and the second rolling means 63. Therefore, the rotation suppression device 1 ^IV can have a simpler configuration than the rotation suppression device 1 of the first embodiment described above. In the rotation suppression devices 1', 1 ", and 1 ^{III according to the} second to fourth embodiments, the second jack 6 and the second rolling means 63 can be omitted.

FIG. 17 is a top view ^{of the rotation suppression device 1 V according to} the sixth embodiment of the present invention. Here, in FIG. 17, the retaining walls 11 and 12 and the target 80 are not shown.
The points different from the above-described fifth embodiment will be described.

In the present embodiment, ^{the guide member 3'of} the rotation suppression device 1 ^{V constituting the rotation suppression system 8 IV} includes a plate-shaped first member 31'extending in the vertical direction and the above-mentioned second member 32. The length of one first member 31'in the longitudinal direction is longer than the length of one lot 20 in the vertical direction. The length of one second member 32 in the longitudinal direction is longer than the length of one lot 20 in the vertical direction. Therefore, the length of one guide member 3'in the longitudinal direction is longer than the length of one lot 20 in the vertical direction.

The first member 31'is, for example, an iron plate. The outer peripheral surface of the caisson 100 is provided via the bolt 33 and the anchor member 21 in a state where one side (side surface 31a') of the first member 31 is in contact with the outer peripheral surface of the caisson 100 (outer peripheral surface 20a of the lot 20). It is detachably attached to (the outer peripheral surface 20a of the lot 20). Here, the first member 31'is formed through a bolt insertion hole into which the male screw portion of the bolt 33 is inserted. Further, the anchor member 21 is formed with a female threaded portion into which the male threaded portion of the bolt 33 can be screwed.

The second member 32 is attached to the first member 31'with one side of the second member 32 in contact with the other side of the first member 31'. Here, in the present embodiment, the first member 31'and the second member 32 are welded and fixed to each other (see the welded portion w shown in FIG. 17).

In the present embodiment, when the force acting on the first jack 4 or the first jack 5 from the second member 32 becomes a predetermined value or more when the caisson 100 is submerged in the ground, the first member w is broken so that the welded portion w is broken. The 31'and the second member 32 may be welded and fixed to each other. In this case, even if an excessive rotational force is generated around the axis P of the caisson 100 when the caisson 100 is submerged in the ground, the welded portion w is broken by the rotational force (shear force), and the second member 32 The first member 31'slides in the circumferential direction of the caisson 100. Therefore, damage to the caisson 100 itself due to the generation of the rotational force (particularly damage at the installation location of the anchor member 21 in the caisson 100) can be prevented.

In particular, according to the present embodiment, the first member 31'and the second member 32 are welded and fixed to each other. As a result, the first member 31'and the second member 32 can be easily integrated without using the bolt 37 or the like described above.
Further, according to the present embodiment, the first member 31'is composed of a plate-shaped member (for example, an iron plate). As a result, the first member 31'can be made into a simple structure. Needless to say, in the above-mentioned first to fourth embodiments, the first member 31'may be used instead of the first member 31.

FIG. 18 is a diagram showing a schematic configuration of a guide member 3 ”in the seventh embodiment of the present invention.
The points different from the above-described sixth embodiment will be described.

In the present embodiment, the second member 32'is composed of a steel pipe 35'extending in the vertical direction and a filler (for example, concrete) 36 filled in the steel pipe 35'. The cross-sectional shape of the steel pipe 35'is a convex shape including a narrow portion 35a and a wide portion 35b. The second member 32 is attached to the first member 31'with one side thereof (wide portion 35b of the steel pipe 35') in contact with the other side of the first member 31'. Here, in the present embodiment, the first member 31'and the second member 32' (the wide portion 35b of the steel pipe 35') are welded and fixed to each other (see the welded portion w shown in FIG. 18).

The first rolling means 43 provided at the tip end portion 42 of the first jack 4 abuts on the side surface 32a'on the side facing the first jack 4 at the narrow portion 35a of the steel pipe 35'of the second member 32'. It is possible. In the present embodiment, when the second member 32'moves in the vertical direction with respect to the first jack 4, the first rolling means 43 is in contact with the side surface 32a' of the second member 32'. The first rolling means 43 can roll on the side surface 32a'of the second member 32'.

The first rolling means 53 provided at the tip end portion 52 of the first jack 5 abuts on the side surface 32b'on the side facing the first jack 5 at the narrow portion 35a of the steel pipe 35'of the second member 32'. It is possible. In the present embodiment, when the second member 32'moves in the vertical direction with respect to the first jack 5, the first rolling means 53 is in contact with the side surface 32b'of the second member 32'. The first rolling means 53 can roll on the side surface 32b'of the second member 32'.

In particular, according to the present embodiment, the steel pipe 35'consisting of the second member 32'has a convex cross-sectional shape including a narrow portion 35a and a wide portion 35b. As a result, the cross-sectional area can be reduced as compared with the second member 32 formed of the square steel pipe 35 described above, so that the second member 32'can be made lighter than that of the second member 32 described above. Needless to say, in the above-mentioned first to fifth embodiments, the second member 32'may be used instead of the second member 32.

FIG. 19 is a diagram showing an example of the operating state display unit 200 according to the eighth embodiment of the present invention.
The points different from the above-described first embodiment will be described.

The rotation suppression device 1 has an operation state display unit 200 that displays the operation states of the first jacks 4, 5 and the second jack 6. The operation status display unit 200 includes, for example, a rectangular parallelepiped housing 200a and lamps 201 to 206 provided on one side surface of the housing 200a and which can be turned on and off. The lamps 201-206 may be composed of, for example, LEDs. The lamp 201 is turned on when the first jack 4 is in the shortening operation, and is turned off at other times. The lamp 202 is turned on when the first jack 4 is in the extension operation, and is turned off at other times. The lamp 203 is turned on when the first jack 5 is in the shortening operation, and is turned off at other times. The lamp 204 is turned on when the first jack 5 is in the extension operation, and is turned off at other times. The lamp 205 is turned on when the second jack 6 is in the shortening operation, and is turned off at other times. The lamp 206 is turned on when the second jack 6 is in the extension operation, and is turned off at other times.

In the present embodiment, for example, the status of the opening / closing operation of various valves provided in the above-mentioned hydraulic circuit and the status of the stroke lengths of the first jacks 4, 5 and the second jack 6 are sensed by various sensors, and these are detected. The sensing result is transmitted to a control unit (not shown) via an electric wire or the like, and each of the first jacks 4, 5 and the second jack 6 is shortened by this control unit based on the above-mentioned sensing result. It can be determined whether or not the operation is in progress and whether or not the extension operation is in progress. Further, the control unit can generate an instruction signal regarding whether or not to turn on each of the lamps 201 to 206 based on the determination result, and transmit this instruction signal to the operation state display unit 200 via an electric wire or the like. .. The operation state display unit 200 may be configured to be able to automatically switch between turning on and off the lamps 201 to 206 based on the transmitted instruction signal.

In particular, according to the present embodiment, the rotation suppression device 1 has an operation state display unit 200 that displays the operation states of the first jacks 4 and 5 and the second jack 6. As a result, the worker who performs the caisson 100 subsidence work monitors the lighting state of the lamps 201 to 206 in the operation state display unit 200, so that the first jacks 4, 5 and the second jack 6 in the rotation suppression device 1 The operating state can be easily grasped. Therefore, the worker can easily grasp whether or not the caisson 100 is rotating (yawing) when the caisson 100 is subsided in the ground 10 (underground), and the result is the caisson. It can be reflected in the ground excavation work for subsidence of 100.

The operation state display unit 200 may be provided in at least one rotation suppression device 1 among the plurality of rotation suppression devices 1 constituting the rotation suppression system 8. For example, each of the plurality of rotation suppression devices 1 constituting the rotation suppression system 8 may have an operation state display unit 200, or one of the plurality of rotation suppression devices 1 constituting the rotation suppression system 8. Only the rotation suppression device 1 may have the operation state display unit 200.

Further, in the present embodiment, the operation status display unit 200 has lamps 201, 203, 205 that are lit during the shortening operation and lamps 201, 203, 205 that are lit during the extension operation for each of the first jacks 4, 5 and the second jack 6. 202, 204, and 206 are provided separately, but instead, the operating status display unit 200 has one lamp corresponding to each of the first jacks 4, 5 and the second jack 6. , Each lamp may be configured to light in different colors during the shortening operation and the extending operation, respectively.

Needless to say, the operating state display unit 200 can be applied to the rotation suppression devices 1', 1 ", 1 ^III , 1 ^IV , and 1 ^V in the second to seventh embodiments. Here, the operating state. ^{When the display unit 200 is applied to the rotation suppression devices 1 IV} and 1 ^V in the fifth to seventh embodiments, the lamps 205 and 206 constituting the operation state display unit 200 may be omitted.

Further, in the present embodiment, the operating state display unit 200 includes the housing 200a and the lamps 201 to 206, but the configuration of the operating state display unit 200 is not limited to this. For example, by displaying the operating states of the first jacks 4, 5 and the second jack 6 on the display of a personal computer or the screen of a tablet terminal, the function as the "operating state display unit" of the present invention may be realized. ..

Next, a ninth embodiment of the present invention will be described.
The points different from the above-described first embodiment will be described.

In the present embodiment, when the first rolling means 43 provided at the tip end portion 42 of the first jack 4 is in contact with the side surface 32a of the second member 32, the first jack 4 to the first rolling means 43 The above-mentioned hydraulic circuit is configured so that the force acting on the second member 32 via the first jack 4 is substantially constant regardless of the expansion / contraction state of the first jack 4. Similarly, when the first rolling means 53 provided at the tip end portion 52 of the first jack 5 is in contact with the side surface 32b of the second member 32, the first jack 5 to the first rolling means 53 is used. The above-mentioned hydraulic circuit is configured so that the force acting on the second member 32 is substantially constant regardless of the expansion / contraction state of the first jack 5. Here, the force acting on the second member 32 from the first jack 4 described above via the first rolling means 43 and the force acting on the second member 32 from the first jack 5 described above via the first rolling means 53. The acting force is a force (load) that is opposite to each other and is equivalent to each other.

In the present embodiment, in the state shown in FIG. 3 (the state in which the caisson 100 and the guide member 3 are located at the reference position (design position) when the caisson 100 is submerged in the ground), the first jack 4 to the first rotation The force acting on the second member 32 via the moving means 43 and the force acting on the second member 32 from the first jack 5 via the first rolling means 53 are in equilibrium with each other. Here, as shown in FIG. 4, when the rotation around the axis P of the caisson 100 occurs during the subsidence of the caisson 100, the first jack 4 remains in the most extended state, while the first jack 5 Is shortened. At this time, the tip end portion 42 (first rolling means 43) of the first jack 4 is separated from the side surface 32a of the second member 32. Therefore, the pressing force from the first jack 4 does not act on the first jack 5. After that, when the rotational force around the axis P of the caisson 100 disappears, the force acting on the second member 32 from the first jack 5 described above via the first rolling means 53 causes the first jack 5 to be in the most extended state. The first jack 5 automatically expands as a restoring force to return to, and as a result, returns to the state shown in FIG. Then, the force acting on the second member 32 from the first jack 4 via the first rolling means 43 and the force acting on the second member 32 from the first jack 5 via the first rolling means 53 are generated. Since they are balanced with each other, the extension operation of the first jack 5 is automatically stopped.

In particular, according to the present embodiment, when the second member 32 (guide member 3) is located at the center position between the pair of first jacks 4 and 5 (see FIG. 3), the pair of first jacks 4 and 5 Each of 5 is in the most extended state. The force acting on the second member 32 (guide member 3) from the first jack 4 via the first rolling means 43 is substantially constant regardless of the expansion / contraction state of the first jack 4. The force acting on the second member 32 (guide member 3) from the first jack 5 via the first rolling means 53 is substantially constant regardless of the expansion / contraction state of the first jack 5. The force acting on the second member 32 from the first jack 4 to the first rolling means 43 and the force acting on the second member 32 from the first jack 5 to the first rolling means 53. Are opposite forces and equivalent forces (loads). Therefore, if one of the first jacks 4 and 5 is shortened by the rotation around the axis P of the caisson 100 and then the rotational force around the axis P of the caisson 100 is lost, the shortened first jack is automatically extended. Since the extension operation is automatically stopped in the state shown in FIG. 3, it is possible to eliminate the need for complicated pressure / stroke control of each jack.

In the present embodiment, when the first rolling means 43 is omitted, the first jack 4 to the second jack 4 to the second when the first jack 4 is in contact with the second member 32 (guide member 3). The force acting on the member 32 (guide member 3) can be substantially constant regardless of the expansion / contraction state of the first jack 4. Similarly, when the first rolling means 53 is omitted, the first jack 5 to the second member 32 (guide) when the first jack 5 is in contact with the second member 32 (guide member 3). The force acting on the member 3) can be substantially constant regardless of the expansion / contraction state of the first jack 5. Further, the force acting on the first jack 4 to the second member 32 and the force acting on the first jack 5 to the second member 32 may be opposite to each other and have the same force (load).

In the present embodiment, the force acting on the first jacks 4 and 5 to the second member 32 (guide member 3) is substantially constant regardless of the expansion and contraction state of the first jacks 4 and 5, but in addition to this, Alternatively, the force acting on the second jack 6 to the second member 32 (guide member 3) may be substantially constant regardless of the expansion / contraction state of the second jack 6. Needless to say, this embodiment can be applied to the above-mentioned second to eighth embodiments.

In the above-described first to ninth embodiments, in the state shown in FIG. 3 (the state in which the caisson 100 and the guide member 3 are located at the reference position (design position) when the caisson 100 is submerged in the ground), the first Each of the jacks 4 and 5 is in the most extended state, but in addition, each of the first jacks 4 and 5 is slightly shorter than the most extended state (close to the most extended state and can be slightly extended). State). In this case, in the state shown in FIG. 3, for example, it is preferable that each of the first jacks 4 and 5 is about 95% of the stroke length in the most extended state. This point is the same for the second jack 6.

In the above-mentioned first to ninth embodiments, the guide members 3, 3', 3 "are composed of the first members 31, 31'and the second members 32, 32', but in addition to this, the guide members 3 , 3', 3 "may be composed of one member extending in the vertical direction (for example, only the second members 32, 32').

In the first to ninth embodiments described above, the second members 32, 32'are composed of the square steel pipe 35 or the steel pipe 35'and the filler 36, but the second members 32, 32'are configured accordingly. Not exclusively. For example, the second members 32, 32'may be H-shaped steel extending in the vertical direction.

In the above-mentioned first to ninth embodiments, the endless rollers have been described as the first rolling means 43 and 53, but the first rolling means 43 and 53 are not limited to the endless rollers. The first rolling means 43, 53 may be a columnar roller or a wheel.

In the first to fourth, eighth and ninth embodiments described above, the endless roller has been described as the second rolling means 63, but the second rolling means 63 is not limited to the endless roller. The second rolling means 63 may be a columnar roller or a wheel.

Needless to say, in the sixth and seventh embodiments described above, the rotation suppressing device 1 ^V may include the second jack 6 and the second rolling means 63 described above.

In the above-mentioned first to ninth embodiments, the cross-sectional shape of the tubular caisson 100 is circular, but the cross-sectional shape of the caisson 100 is not limited to a circular shape, and is, for example, an elliptical shape or a rectangular shape. May be good.

In the above-mentioned first to ninth embodiments, the caisson 100 (lot 20) is constructed at the construction site, but in addition, the caisson 100 (lot 20) is manufactured at a factory or the like away from the construction site. (So-called precast material) may be used.

In the above-mentioned first to ninth embodiments, the caisson 100 (lot 20) is made of concrete, but the caisson 100 (lot 20) is not limited to concrete, and may be made of steel, for example.

In the above-mentioned first to ninth embodiments, the pneumatic caisson method is used, but instead, the open caisson method may be used. When the open caisson method is used, the caisson 100 is sunk into the ground by being pressed downward by, for example, a press-fitting device on the ground.

In the above-mentioned first to ninth embodiments, when the target 80 is surveyed using the above-mentioned goniometer, the top end of the second members 32, 32'of the guide members 3, 3', 3'and the target 80. Is located above the ground 10a, but in addition to this, even if the top end of the second members 32, 32'of the guide members 3, 3', 3 "and the target 80 are located below the ground 10a. good. In this case, for example, in addition to the above-mentioned range-finding goniometer, a laser vertical device arranged directly above the target 80 is used, and the reflection prism above the laser vertical device is mounted by the above-mentioned range-finding goniometer. It may be collimated and a laser vertical device may be used to capture the target 80 directly below.

In the above-mentioned first to ninth embodiments, an example in which the caisson rotation suppression device, the caisson rotation suppression system, and the caisson subsidence method according to the present invention are applied to the construction of a shaft has been described, but the caisson according to the present invention has been described. The application examples of the rotation suppression device, the rotation suppression system of the caisson, and the method of laying the caisson are not limited to this. For example, the caisson rotation suppression device, the caisson rotation suppression system, and the caisson laying method according to the present invention may be applied to the construction of an underground structure other than the shaft or the construction of the foundation of the structure.

The illustrated embodiments merely illustrate the present invention, and the present invention makes various improvements and modifications made by those skilled in the art within the scope of the claims, in addition to those directly shown by the described embodiments. Needless to say, it is an inclusion.

1,1', 1 ", 1 ^III , 1 ^IV , 1 ^V rotation restraint device 2, 2'framework 3, 3', 3" guide member 4, 5 first jack 6 second jack 8, 8', 8 , 8 ^III , 8 ^IV Rotation suppression system 10 Ground 10a Ground 11, 12 Retention wall 13 Space 13a Expansion space 20, 20 _n-2 , 20 _n-1 , 20 _n , 20 _{n + 1} lot 20a Outer surface 21 Anchor member 22 Recesses 25, 26, 27 Beam member 29 Lot planned construction area 31, 31'First member 31a, 31a' Side surface 32, 32'Second member 32a, 32a', 32b, 32b', 32c Side surface 33 Bolt 34a Step portion 34 Bolt insertion hole 35 Square steel pipe 35'Steel pipe 35a Narrow part 35b Wide part 36 Filling material 37 Bolt 38 Bolt insertion hole 38a Step part 39 Convex part 41 Base end part 42 Tip part 43 First rolling means 51 Base end part 52 Tip Part 53 First rolling means 61 Base end 62 Tip 63 Second rolling means 71 Outer formwork 72 Inner formwork 80 Target 90 Raising material 95 Strut 97 Connecting member 100 Caisson 200 Operating status display unit 200a Housing 201-206 Lamp w Welded part P Axis line

Claims (22)

A device that suppresses the rotation of a caisson submerged in the ground around the axis extending in the vertical direction.
A guide member that is detachably attached to the outer peripheral surface of the caisson and extends in the vertical direction,
A pair of stretchable first jacks arranged so as to sandwich the guide member in the circumferential direction of the caisson,
A support portion that is fixed to the ground and supports the first jack,
Caisson rotation suppression device. The caisson has an anchor member provided on the outer peripheral portion thereof.
The rotation suppressing device for a caisson according to claim 1, wherein the guide member is detachably attached to an outer peripheral surface of the caisson via the anchor member. The guide member
A first member that extends in the vertical direction, one side of which abuts on the outer peripheral surface of the caisson, and is detachably attached to the outer peripheral surface of the caisson via the anchor member.
A second member whose one side is attached to the other side of the first member and extends in the vertical direction,
Including
The rotation suppressing device for a caisson according to claim 2, wherein the pair of first jacks are arranged so as to sandwich the second member in the circumferential direction of the caisson. The first member and the second member are fastened with bolts.
The caisson rotation suppressing device according to claim 3, wherein the bolt breaks when the force acting on the first jack from the second member exceeds a predetermined value. The caisson rotation suppressing device according to claim 3, wherein the first member and the second member are welded and fixed to each other. The base end portion of the first jack is fixed to the support portion, and the first jack has a base end portion fixed to the support portion.
A first rolling means is provided at the tip of the first jack.
The first rolling means can come into contact with the side surface of the second member.
When the second member moves in the vertical direction with respect to the first jack, the first rolling means is in contact with the side surface of the second member, and the first rolling means is in contact with the side surface of the second member. 2. The caisson rotation restraining device according to any one of claims 3 to 5, which can roll on the side surface of the member. Any one of claims 3 to 6, wherein each of the pair of first jacks is in the fully extended state when the second member is located at the center position between the pair of first jacks. The caisson rotation restraint device described in 1. The caisson rotation suppressing device according to any one of claims 3 to 7, wherein the force acting on the second member from the first jack is substantially constant regardless of the expansion / contraction state of the first jack. .. Any one of claims 3 to 8, further comprising a stretchable second jack whose base end is fixed and supported by the support and whose tip faces the other side of the second member. One of the caisson rotation suppression devices. A second rolling means is provided at the tip of the second jack.
The second rolling means can come into contact with the other side surface of the second member.
When the second member moves in the vertical direction with respect to the second jack, the second rolling means is in contact with the other side surface of the second member. The caisson rotation restraining device according to claim 9, wherein the second member is capable of rolling on the other side surface of the second member. A convex portion is formed on one side surface of the first member.
The rotation suppressing device for a caisson according to any one of claims 3 to 10, wherein a concave portion for accommodating the convex portion is formed on the outer peripheral surface of the caisson. The caisson rotation suppression device according to any one of claims 3 to 11, wherein the first member constitutes a part of a caisson construction formwork. The rotation of the caisson according to claim 1 or 2, wherein each of the pair of first jacks is in the fully extended state when the guide member is located at the central position between the pair of first jacks. Suppressor. The caisson according to any one of claims 1, 2, and 13, wherein the force acting on the guide member from the first jack is substantially constant regardless of the expansion and contraction state of the first jack. Rotation suppression device. The rotation suppressing device for a caisson according to any one of claims 1, 2, 13, and 14, wherein the guide member constitutes a part of a mold for constructing a caisson. The caisson rotation suppression device according to any one of claims 1 to 15, further comprising an operating state display unit for displaying the operating state of the first jack. The caisson rotation restraining device according to any one of claims 1 to 16, wherein the caisson has a cylindrical shape. A system having a plurality of caisson rotation suppressing devices according to any one of claims 1 to 17, and suppressing the rotation of the caisson around an axis extending in the vertical direction.
A caisson rotation suppression system in which the plurality of rotation suppression devices are provided at intervals in the circumferential direction of the caisson. The rotation suppression system for a caisson according to claim 18, wherein the three or four rotation suppression devices are provided at intervals in the circumferential direction of the caisson. A method of submerging the caisson in the ground using the caisson rotation suppression system according to claim 18 or 19.
A caisson subsidence step in which the caisson to which the guide member is attached is subsided in the ground,
After the caisson subsidence step, a guide member ascending movement step of separating the guide member from the caisson and ascending and moving the guide member, and a step of ascending and moving the guide member.
Caisson laying methods, including. A method of submerging the caisson in the ground using the rotation suppressing device for the caisson according to any one of claims 1 to 17.
A caisson subsidence step in which the caisson to which the guide member is attached is subsided in the ground,
After the caisson subsidence step, a guide member ascending movement step of separating the guide member from the caisson and ascending and moving the guide member, and a step of ascending and moving the guide member.
Caisson laying methods, including. The method for laying a caisson according to claim 20 or 21, further comprising a lot construction step of constructing a new lot above the caisson after the guide member ascending / moving step.

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