WO2020084709A1

WO2020084709A1 - Press-fit method for immersion body, press-fit device, and removal method for immersion body

Info

Publication number: WO2020084709A1
Application number: PCT/JP2018/039513
Authority: WO
Inventors: 松岡　馨; 良幸濱田
Original assignee: Ｊｆｅ建材株式会社; 株式会社加藤建設
Priority date: 2018-10-24
Filing date: 2018-10-24
Publication date: 2020-04-30

Abstract

In a press-fit method according to the present invention, a press-fit immersion device (1) is constructed by, on an inner side surrounded by a plurality of support columns (21) installed on the top surface of a footing (E), attaching a screw-down member (23) to the plurality of support pillars (21) so as to be able to rise and fall, and disposing press-fit devices (3) that cause the screw-down member (23) to rise and fall, and a multi-level cylindrical immersion body (110) is constructed below the screw-down member (23) on the top surface of the footing (E); on the top end surface of the immersion body (110), arc-shaped segments (112) constituting each level are connected one by one to assemble a ring body (111); the press-fit device (3) is lowered and the screw-down member (23) is lowered to the top surface of the ring body (111), whereby the immersion body (110) is pressed downward to a prescribed depth; after the screw-down member (23) is raised, the segment (112) on the top surface of the immersion body (110) is connected in the same manner to the ring body (111), and the screw-down member (23) is again lowered to press the immersion body (110) downward to the prescribed depth, and these operations are repeated, whereby the immersion body (110) is sequentially immersed.

Description

Press-fitting method for deposits, press-fitting device and pull-out method for deposits

The present invention relates to a method for press-fitting a deposit, a press-fitting device, and a method for extracting a deposit.

In the conventional press-fitting method for a submerged body, every time when excavating or press-fitting a submerged body that is to be submerged while stacking ring bodies in multiple stages, (1) a protection ring is installed on the top of the submerged submerged body as shown in the flowchart in FIG. , (2) Install press-fitting jacks, girders, press plates and other press-fitting and depressing equipment on it, (3) After connecting to the sinking anchor, (4) Excavating and press-fitting and then (5) Connected sinking Separate the anchor, and (6) remove the press-fitting equipment such as the press-fitting jack, girder, and pressure plate, (7) remove the protection ring, and then place the next segment on the submerged deposit. The ring bodies are formed by connecting them in the circumferential direction, and thereafter, the operations (1) to (7) are repeated to deposit the deposit body to a predetermined depth. For this reason, after placing a new segment, the operations described in (1) to (3) and (5) to (7) above are repeated every time excavation and press-fitting / deposition.

However, in the case of the press-fitting method, the work described in (1) to (3) and (5) to (7) above is required, which requires a lot of time, and not only the work efficiency is low, but also the protection ring. There was a problem that work at high places handling heavy objects such as girders and girders was involved.

Therefore, the present invention has been made in view of the above problems, and is described in the above (1) to (3) and (5) to (7), which are performed after excavation and press-fitting / depositing after each segment is mounted. It is an object of the present invention to provide a press-fitting method for a deposit, a press-fitting device, and a pull-out method for a deposit that are designed to reduce work at high places, improve work efficiency, and save labor by omitting the work described above. It is a thing.

In order to solve the above-mentioned problems, the press-fitting method according to the present invention is such that, on the inner side surrounded by a plurality of pillars erected on the upper surface of the ground, a pressing member is attached to the plurality of pillars so as to be able to move up and down, and the pressing member is A press-fitting and depressing device is constructed by arranging a press-fitting device for moving up and down, and a multi-stage and cylindrical deposit is constructed on the upper surface of the ground below the pressing member, and each step is formed on the upper end face of the deposit. The arc-shaped segments are connected one by one to assemble a ring body, and the press-fitting device is lowered to lower the pressing member on the upper surface of the ring member, thereby pressing the deposit body downwardly by a predetermined depth, and pressing the pressing member. After ascending, the segment is similarly connected to the ring body on the upper surface of the submerged body, and the pressing member is lowered again to press the submerged body downward by a predetermined depth, and these operations are repeated. Characterized by being adapted to sequentially sinking the sinking body by returning.

Further, it is preferable that the plurality of press-fitting devices be provided on the press-down member, and the number of press-fitting devices used be changed according to a difference in required pressure input to each ground.

In addition, a plurality of anchors are installed in the ground, the press-fitting device is attached to the anchor, and the submerged body is grounded by the reaction force of the steel wire of the anchor arranged in the pressing member via the press-fitting device. It is preferable that the anchor steel wire used at the time of press-fitting is replaced with a bracket attached to the outer periphery of the above-ground segment by replacing the steel wire of the anchor by press-fitting into the bracket and after placing the concrete on the bottom of the excavation after finishing the excavation.

Further, it is preferable that the plurality of anchors are installed at a position separated by 0.5 m or more from the outer peripheral surface of the submerged body and spaced from each other by 1.0 m or more.

In addition, in order to form the lowermost ring body of the submerged body, a step of temporarily connecting the suspended segments to each other, and making the connected segments a predetermined length in the circumferential direction to be self-supporting. Step and, for the self-supporting segment, in the state of suspending the next segment, there is a step of temporarily connecting in the circumferential direction, and if the lowermost ring body is constituted by the temporary connection for one round, A step of correcting a coupling error using a fastening joint fitting provided on the surface, and a step of welding the segments forming the lowermost ring body to each other to complete the lowermost ring body, It is preferable that the segment forming the lowermost ring body is provided with a blade portion that is attached not at the site but at the factory.

In addition, a ring-shaped blade portion is installed along the lower end of the lowermost ring body, and a plurality of projections that are continuous in the vertical direction are provided on at least a part of the outer peripheral surface in the circumferential direction. An outer shell in which the protrusion has a substantially quadrangular shape, a main girder welded to the upper and lower edges of the quadrangle on the inner surface of the outer shell, and a right edge and a left edge of the quadrangle on the inner surface of the outer shell. It is preferable that the joint plate welded to and the joint plate project outward from the outer shell to form a protrusion.

Moreover, it is preferable that the height of the blade portion is 0.5 to 1.0 m.

Further, the submerged body, each segment is long in the circumferential direction of the submerged body, main girders arranged in parallel with each other, and a pair of left and right joint plates respectively connecting the main girders at the left and right end portions, respectively. A vertical rib connecting the central portion of the main girder in the vertical direction, and an outer shell stretched over the main girder, the joint plate, and the vertical rib, and the thickness of each segment, that is, the main The sum of the girder width and outer shell thickness is constant in all the main girders in the same segment, and the thickness of the first stage segment, which is the bottom stage, is the same as the thickness of the second stage segment. Due to the small size, it is preferable that the main girder portion of the segment between the first stage and the second stage forms an overhang-like step.

In addition, the submerged body is provided on the outer periphery of the blade mouth portion in order to reduce friction generated between the blade mouth portion provided around the lower end portion and the ground body around the first body. Friction cut portion and a second friction cut portion provided on the outer periphery of the vertical middle portion, and the second friction cut portion is provided on the outer periphery of the blade opening portion. It is preferable that the belt-like portion has a thickness smaller than the thickness of the portion, and has a predetermined vertical dimension and projects outward.

Further, the first friction cut portion and the second friction cut portion are provided at a distance of 8 to 11 m from each other in the height direction of the submerged body, and a plurality of the second friction cut portions are provided. When the parts are provided, it is preferable that the second friction cut parts are provided at a distance of 8 to 11 m from each other in the height direction of the submerged body.

Further, in order to solve the above-mentioned problems, a press-fitting device according to the present invention used in a press-fitting method has a central hole penetrating a cylinder housing and a piston, and a hydraulic cylinder arranged vertically, and a hydraulic cylinder of the hydraulic cylinder. The upper and lower gripping housings, which are fixed to the cylinder housing and the piston, respectively, have communication holes that communicate with the central hole, and are provided inside the upper and lower gripping housings, respectively. A gripping means for gripping the tension material inserted into the central hole and each of the communication holes, wherein the tension cylinder extending vertically from the reaction member is alternately gripped by each of the gripping means, By operating and expanding and contracting the piston, the reaction force of the reaction force member is transmitted to the submerged body and the submerged body is forced into the ground. In the press-fitting device used for the press-fitting method of inserting, each of the gripping means has an inner surface which is disposed centering on the communication hole of each of the gripping housings and is capable of being in surface contact with or detachable from the surface of the tension member. A plurality of gripping pieces and an inner surface that is disposed on the inner surfaces of the upper and lower gripping housings corresponding to the plurality of gripping pieces and has an inner surface slidable to the outer surface of the corresponding gripping piece; A plurality of guide frames for guiding the movement of each grip piece, the outer surface of each grip piece is inclined so as to converge downward, and the inner surface of each guide frame is inclined so as to converge downward. And a piston housed in a cylinder housing includes a plurality of rods projecting into the gripping housing for gripping the tension member with the gripping pieces. And a moving means for moving the gripping pieces along the inner surface of the corresponding guide frame by connecting the gripping pieces and applying a force to the gripping pieces. And

Furthermore, the depositing body that has been sunk by the press-fitting construction method that has solved the above-mentioned problems is pulled out.In the extraction construction method according to the present invention, segments are connected in the ring circumferential direction to assemble ring bodies, and the ring bodies are vertically stacked and connected. Assembling the submerged body, and applying pressure from above the submerged body while excavating the inside of the submerged body, the submerged body is installed from the ring-shaped blade portion installed along the lower end edge of the ring body at the lowermost end. Is press-fitted into the ground to construct an earth retaining wall with the submerged body in the ground, and after the predetermined construction is finished, the submerged body is pulled out and removed from the ground A pulling-out method for pulling out a submerged body, in which a steel material for pulling out is attached or arranged in advance to the segment, the ring body, or the submerged body, and a pulling force is applied to the steel material to pull it out. And performing a tree.

According to the present invention, it is possible to omit all the operations described in (1) to (3) and (5) to (7) of the conventional construction method.

FIG. 3 is a front view of the press-fitting and depositing device according to the first embodiment. FIG. 3 is a plan view of the press-fitting and depositing device according to the first embodiment. FIG. 2 is a sectional view taken along line XX in FIG. 1. It is a fragmentary sectional view for explaining the composition of a submerged structure. It is the perspective view which looked at the segment in which the blade part was installed from the inside. It is a figure for demonstrating the structure of the friction cut part of a submerged body. It is the perspective view which looked at the segment from the outside. It is the perspective view which looked at another segment from the outside. It is a perspective view for explaining the state where the bracket was attached to the submerged body. It is a figure for demonstrating the press-fitting construction method of a deposit. It is a figure for demonstrating the press-fitting construction method of a deposit. It is a figure for demonstrating the press-fitting construction method of a deposit. It is a figure for demonstrating the press-fitting construction method of a deposit. It is a figure for demonstrating the structure of the press-fitting and depositing apparatus which concerns on 2nd Embodiment. It is sectional drawing for demonstrating the structure of a press fit jack. FIG. 16 is a cross-sectional view taken along the line AA of FIG. 15. It is a top view showing a grasping piece. It is a top view which shows a guide frame. FIG. 18 is a cross-sectional view taken along the line BB of FIG. 17. FIG. 19 is a cross-sectional view taken along the line CC of FIG. 18. It is a figure which shows the arrangement | positioning relationship of the holding piece with respect to a guide frame. It is a figure which shows the assembly process of a press-fitting and depositing apparatus. It is a figure which shows the assembly process of a deposit body. It is a figure which shows a press fit process and an excavation process. It is a figure which shows a lift-up process. It is a figure which shows the assembly process of a submerged structure. It is a figure for demonstrating the structure of another segment. It is a figure for demonstrating the structure of the segment to which the steel material was attached. It is a flowchart of the conventional press-fitting construction method of a submerged body.

A preferred embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiment described below is merely an example, and various embodiments can be adopted within the scope of the present invention.

<Structure of press-fitting and depositing device>
[First Embodiment]
As shown in FIG. 1, the press-fitting and depositing device 1 according to the first embodiment includes a depositing device 2 and a press-fitting jack (press-fitting device) 3 combined with the depositing device 2. The sinking device 2 includes a support beam 22 and a pressure beam (pressure reduction member) 23. The support beam 22 is bridged between the two pairs of columns 21 out of the four pairs of columns 21 forming a pair. The reduction beam 23 is provided between the support beams 22.

The pair of columns 21 are vertically erected at appropriate intervals at the front and rear portions of the sinking anchors 150 that are respectively driven into the four corners of the ground E at the construction (planned) position of the sinking structure 100 (see FIG. 4). To be done. A locking member 24 is attached so as to be vertically slidable so as to straddle the adjacent columns 21 of the pair of columns 21 of each set. The upper end of the press-fitting jack 3 for raising and lowering is attached to the lower surface of the locking member 24. The lower end of the rod 5 (see FIG. 3) of the press-fit jack 3 is attached to the locking member 25. The locking member 25 faces the locking member 24 in the height direction and is attached to the pair of columns 21 so as to be vertically slidable.

The support beam 22 is horizontally laid between the

columns

21 and 21 of the four pairs of columns 21 arranged on the left and right sides in FIG. Both ends of each support beam 22 are supported by locking members 25. The pressing beam 23 presses the cylindrical deposit 110 or the segment 112 shown in FIG. 4 downward. As shown in FIG. 2, the reduction beam 23 is arranged across the support beams 22 horizontally arranged in the front and rear. The pressure-reducing beam 23 has a ring-shaped support frame 26 having substantially the same diameter as the outer circumference of the segment 112, and is supported by the support beam 22 by arm pieces 27 extending horizontally from both sides in the front-rear direction.

The press-fit jack 3 is similar to a so-called center hole jack that vertically moves the compression beam 23. The press-fitting jack 3 gradually presses a submerged body 110, which is formed by connecting a plurality of ring bodies 111 shown in FIG. 4 in the vertical direction, into the ground. The press-fitting jack 3 transmits the reaction force of the sinking anchor 150 as a reaction force member, which is transmitted via the rod 5, to the sinking structure 100 and presses it in.

Each press-fitting jack 3 is provided between each pair of columns 21 and between the locking member 24 and the locking member 25. The outer peripheral portion of the support frame 26 is located outside the outer diameter of the submerged body 110. The size of the inner peripheral portion of the support frame 26 is set to be equal to or smaller than the inner diameter of the submerged body 110.

The rod 5 has a circular cross section as shown in FIG. The rod 5 does not have any special processing such as unevenness on its surface, and is generally easily available. In the state where the locking member 24 is fixed, the press-fitting jack 3 holds the rod 5 and lowers the rod 5 to push down the locking member 25, and the reaction force of the sinking anchor 150 is sunk through the pressing beam 23. It is transmitted to 110 and the submerged body 110 is pressed into the ground.

<Structure of submerged structure>
Next, with reference to FIG. 4, the structure of the deposit structure 100 constructed using the press-fitting and depositing apparatus 1 will be described. The submerged structure 100 includes a submerged body 110 that is submerged in the ground, a bottom plate portion 130 that is provided at a bottom portion inside the submerged body 110, and a submerged anchor used when the submerged body 110 is submerged in the ground. And 150.

[Deposited body]
The submerged body 110 is constructed in a multi-stage and cylindrical shape, and is submerged in the ground so that its axis extends along the vertical direction. The submerged body 110 is constructed as a retaining wall. The submerged body 110 is assembled by connecting a plurality of ring bodies 111 each having an annular shape in plan view in the axial direction thereof. The ring body 111 that constitutes the submerged body 110 is constructed in a circular shape by connecting a plurality of steel arc-shaped segments 112 one by one in the ring circumferential direction. Note that the deposit 110 is not limited to an annular shape in plan view, and may be constructed in other shapes such as an ellipse, an ellipse, a rectangle, and a polygon.

Segment 112 is manufactured at the factory. As shown in FIG. 5, the frame of the segment 112 is formed by welding a pair of parallel linear joint plates 114 to both ends of a pair of parallel curved main girders 113. The segments 112 that are vertically stacked in the ring body 111 are arranged in a staggered manner with the joint plates 114 being displaced in the circumferential direction. Further, five vertical ribs 116 are arranged in parallel with the joint plate 114. The vertical ribs 116 are passed through the main girder 113 with a predetermined space therebetween. A skin plate (outer shell) 117 is stretched over the main girder 113, the joint plate 114, the vertical ribs 116, and the middle main girder 115 to form the segment 112. Inside the vertical ribs 116, a backing plate 116a is partially stretched over the center of the steel segment 112, and a bucket suspended by a wire of a heavy machine for excavation comes into contact with the recoil plate to revolve. This prevents the position of the bucket from being difficult to control due to movement.

The skin plate 117 has a curved curved surface, and is substantially quadrangular. Main girders 113 are welded to the upper and lower edges and the joint plate 114 is welded to the right and left edges on the inner surface of the substantially rectangular shape. Further, the main girder 113 and the joint plate 114 are formed with

bolt holes

113a and 114a for connecting the segments 112 that are adjacent to each other in the axial direction and the circumferential direction. One middle main girder 115 may be arranged in parallel to the pair of main girders 113 in this frame. The middle main girders 115 can be passed through the joint plate 114 with a predetermined space therebetween to increase the strength of the frame body.

A blade opening 120 is provided at the lower end of the segment 112 (lower side in FIG. 5) of the lowermost ring body 111. The height of the blade is 0.5 to 1.0 m. The blade portion 120 is installed in advance along the lower surface of the main girder 113 below the segment 112 in a factory. The blade opening 120 includes an outer plate 121, an inner plate 122, and a top plate 123. The outer plate 121, the inner plate 122, and the top plate 123 form a closed space 123a having a substantially right triangle. The outer plate 121 is formed to be curved in a cylindrical shape. The inner plate 122 is bent so as to form a curved surface of a truncated cone. The tips of the outer plate 121 and the inner plate 122 are abutted at an acute angle and joined by welding. The closed space 123a of the blade opening 120 is filled with grout.

As shown in FIGS. 5 and 6, the outer plate 121 of the blade opening 120 is provided with a friction cut portion (first friction cut portion) 124. The surrounding ground E is pushed outward by the friction cut portion 124, and a predetermined gap 125 is formed between the ground E and the outer surface of the deposit 110. The function of the gap 125 can reduce the friction generated between the ground. In the submerged body 110, a plurality of friction cut portions 124 are provided on the outer plate 121 of the blade opening 120. The friction cut portion 124 is provided on the entire outer peripheral surface of the sinker 110 in the circumferential direction.

Two fastening joint fittings 127 are attached to the left and right ends on the outer surface of the friction cut portion 124. The fastening joint fitting 127 is a fitting for temporary assembly for performing accurate welding when connecting the blade openings 120 in the ring circumferential direction. The fastening joint fitting 127 has an L-shaped cross section. One side of the L-shape is welded to the friction cut portion 124, the other side is projected, and a hole through which a bolt is inserted is formed on the other side. The fastening joint fitting 127 faces the fastening joint fitting 127 in the adjacent segment 112 in a pair, and can be fastened by a bolt and a nut.

In the segment 112 of the ring body 111 where the blade portion 120 is not provided, as shown in FIG. 7, the left and right joint plates 114 linearly project outward from the skin plate 117 to form a projection 118. ing. The lower end of the protrusion 118 is formed obliquely toward the skin plate 117. As a result, the resistance to the ground E is reduced when the ground E is press-fitted. Further, the linearly protruding portion of the protrusion 118 may be bent. The segments 112 are arranged in a zigzag manner, so that the projections 118 are also partially continuous in a zigzag shape when viewed from the entire submerged body 110. However, it is also possible to add projections of the same shape between the partial projections 118 by welding so that the projections 110 are continuously long in the vertical direction when viewed from the whole of the submerged body 110.

In the above embodiments, the projection 118 is formed by projecting the left and right joint plates 114 outward. However, it is also possible to form a protrusion having a hollow cross section with a horizontal cross section having an acute triangle. The hollow protrusions may be provided at long and continuous positions for each of the segments 112 that are vertically connected. The submerged anchor 150 is passed through the inside of the hollow protrusion. The submerged anchor 150 is housed in a tube (not shown) having a circular cross section, has little friction with the inside of the hollow projection, and the submerged body 110 is directly laid down using the projection as a guide. Increase. The tube also protects the sink anchor 150.

Note that the shape of the horizontal cross section of the hollow protrusion is not limited to a triangle, and may be square or circular, whether solid or hollow. Further, a thin plate material may be used as the protrusion.

Note that, as shown in FIG. 8, in the submerged body 110, a segment 112a in which a friction cut portion (second friction cut portion) 118a is provided in a segment in which the protrusion 118 is provided is used. The lower end of the friction cut part 118a is formed obliquely.

The segment 112a is provided around the outer periphery of the intermediate portion in the vertical direction of the deposit 110. A friction cut portion 118a is provided in the submerged body 110. The friction cut portion 118a can be formed by attaching a steel plate to the lower end portion of the segment 112a and providing a step. The friction cut portion 118a is provided above the friction cut portion 124 at a distance of 8 to 11 m in the height direction (vertical direction) of the submerged body 110. When a plurality of friction cut portions 118a are provided, one friction cut portion 118a is provided in the vertical direction of the submerged body 110 at a distance of 8 to 11 m from the other friction cut portions 118a. ing.

The friction cut portion 118a has a thickness equal to or less than the thickness of the friction cut portion 118 provided on the outer periphery of the blade opening 120 and a predetermined vertical dimension, and projects outward. The friction cut portion 118a extends in a strip shape between the one joint 114 and the other joint 114 of the segment 112a. The friction cut portion 118a forms a predetermined gap between the submerged body 110 and the ground E, and reduces the frictional force generated between the segment 112a and the ground.

Even if the excavation is completed, it may not be possible to release from the reaction force of the submerged anchor 150 in order to prevent the submerged body 110 from rising. Therefore, as shown in FIG. 9, a bracket 170 for maintaining the reaction force of the sinking anchor 150 is attached to the skin plate 117 of the segment 112 exposed from the ground E. The bracket 170 is a triangular frame body in which a vertical steel member 171 and a horizontal steel member 172 are connected by a diagonal member 173.

Here, since the segment 112 is made of steel, the bracket 170 made of steel can be firmly integrated with the segment 112 made of steel by various methods such as bolting and welding. The bracket 170 is arranged at the position of the steel wire 152 of the sinking anchor 150 used at the time of press fitting. The anchor plate 150P is attached to the end of the steel wire 152 exposed from the ground E, and the anchor plate 150P is fixed to the bracket 170. As a result, the sink anchor 150 used at the time of press fitting can be used as it is even after the press fitting is finished to prevent the sinker 110 from rising.

[Bottom part]
As shown in FIG. 4, the bottom part 130 serves as a basis for the submerged structure 100 and prevents underground water from spouting inside the submerged body 110. The bottom part 130 is constructed of, for example, underwater concrete. The bottom plate 130 is constructed so that its upper surface is substantially along the horizontal plane.

[Sinking anchor]
The sinking anchor 150, when the sinker 110 is pushed into the ground by the press-fitting and sinking device 1, when the force is applied to the ring body 111 by the press-fitting jack 3 from above the ring body 111 at the uppermost end, the sinker anchor 150 is pushed into the ground. Apply reaction force to the ground E. As shown in FIG. 4, the submerged anchor 150 includes a fixing portion 151 and a steel wire 152. The fixing portion 151 is embedded and fixed in the ground excavated outside and below the sunk position of the sunk body 110. The steel wire 152 is connected to the fixing portion 151, extends along the outer wall surface of the submerged body 110 to the surface of the earth, and is connected to an immovable portion (such as a base portion) of the press-fitting jack 3 into which the ring body 111 is pushed. In the present embodiment, the steel wire 152 is connected to the press-fit jack 3 via the column 21 and the locking

members

24 and 25.

The fixing part 151 is formed of, for example, grout poured into the excavated ground. The fixing portion 151 is constructed at a position deeper than the blade opening 120 outside the blade opening 120 of the deposit 110. The steel wire 152 is formed of, for example, a wire rope. The lower end portion of the steel wire 152 is embedded and fixed in the fixing portion 151 by solidifying the grout. The upper end of the steel wire 152 is connected and fixed to the immovable portion of the press-fitting jack 3. The fixing portion 151 and the steel wire 152 are formed so as to extend on the same axis along a direction perpendicular to the ground surface.

<Construction method of submerged structure>
Below, the construction method of the depositing structure 100 using the press-fitting and depositing apparatus 1 will be described with reference to FIGS. 10 to 13.

First, as shown in FIG. 10, in the “ground anchor work”, the percussion drill A1 equipped to the work vehicle A is used, and a plurality of (four in this embodiment) submerged anchors 150 are fixed at the construction point. The part 151 and the steel wire 152 connected thereto are embedded. The submerged anchors 150 are installed at a position separated by 0.5 m or more from the outer peripheral surface of the submerged body 110 and spaced from each other by 1.0 m or more.

Next, assemble the body of the press-fitting and depositing device 1. First, a pair of columns 21 are erected at the four corners of the upper surface of the ground E in which the sinking anchors 150 are embedded, and the support beam 22 is bridged over the two pairs of columns 21 via the locking members 25. . The pressure reducing beam 23 is crossed over the supporting beams 22 arranged in front of and behind to construct the submersion apparatus 2. The pressing beam 23 is attached to the support column 21 so as to be movable up and down. Next, the press-fitting jack 3 is attached between the columns 21 and between the locking

members

24 and 25 to assemble the press-fitting and depositing apparatus 1.

Next, as shown in FIG. 11, a deposit 110 having a required height is constructed on the ground E below the reduction beam 23. The submerged body 110 functions as a retaining wall. The pressing beam 23 is stopped at a predetermined height position of each of the columns 21, and as shown in FIG. 12, a plurality of segments (for example, 6 to 8) divided into segments 112 are hung by a crane one by one, and the segments are directly suspended. The central opening 26a (see FIGS. 2 and 3) of the support frame 26 formed in the ring shape of the pressure-reducing beam 23 is used to descend, and are arranged side by side in a circular shape along the upper end surface of the deposit 110 to be connected.

For example, the two lowermost segments 112 suspended by a crane or the like are tentatively connected by bolts and nuts that pass through the bolt holes 114a of the joint plate 114. By this temporary connection, the connected segments 112 have a sufficient length in the circumferential direction, can stand on their own, and can be prevented from falling. The next segment 112 is temporarily connected to the self-supporting segment 112 in a suspended state. In this way, when all the segments 112 that form one ring body 111 are temporarily connected, the connection error is corrected by using the fastening joint fitting 127. In this state, the segments 112 are welded to each other. Since the blade openings 120 are installed in advance in the two lowermost segments 112, the blade openings 120 are connected at the same time. After this welding, the joint fitting 127 for fastening is removed by a burner for welding.

Next, while excavating the ground E in the submerged body 110, as shown in FIG. 13, each press-fitting jack 3 is operated in a state where each locking member 24 is fixed, and the locking member 25 is provided along each pillar 21. To lower the pressure beam 23 onto the upper surface of the ring body 111. Next, the pressure reducing beam 23 pushes the deposit body 110 downward to a predetermined depth, and press fits it into the ground E. When the pressing operation of the submerged body 110 is completed, the operation of each press-fitting jack 3 is stopped, and then the pressing beam 23 is raised together with the rod 5 of the press-fitting jack 3 so that the upper end surface of the submerged submersible body 110 and the pressing beam 23 are separated. A space having a predetermined height is provided between the two.

Next, an inner scaffold (for example, see FIG. 26) A3 is installed inside the submerged body 110. That is, in order to assemble the next ring body 111 on the upper end surface of the submerged body 110, the inner scaffold A3 for work is installed inside the submerged structure 100.

Next, a plurality of segments 112 are stacked and connected to the upper end surface of the deposit body 110 in the space between the upper end surface of the deposit body 110 and the pressing beam 23 to form a ring body 111. After that, the pressure-reducing beam 23 is again lowered on the upper surface of the deposit body 110 to press the deposit body 110 downward, and press fit into the ground E to deposit.

After that, the inner scaffold A3 is removed, and the submerged body 110 is press-fitted and the earth and sand are excavated, that is, the press-fitting process and the excavation process are further performed. In this way, by repeating the above-described series of steps, the deposit 110 is forcibly pressed into a predetermined depth to be deposited. The above is the press-fitting method of the submerged body 110.

After that, after the submerged structure 100 reaches a predetermined depth, slime treatment is performed. That is, water is replenished in the holes inside the submerged structure 100, and the slime (mud-like fine particle solid matter) accumulated at the bottom of the holes is treated. This slime treatment is performed by operating the submersible pump and carrying out the slime at the bottom of the hole through the tremie pipe.

Then, concrete is poured by the plunger tremie method to form the bottom plate portion 130 at the bottom of the hole. That is, underwater concrete is poured into the hole bottom through a tremie pipe, and after the underwater concrete is hardened, water in the hole is carried out by an underwater pump. In this way, the bottom plate portion 130 is formed at the bottom of the hole.

Next, a bracket 170 is attached to the segment 112 of the submerged body 110 exposed from the ground E. The bracket 170 is arranged at the position of the steel wire 152 of the sinking anchor 150 used at the time of press fitting. The steel wire 152 is replaced and fixed to the bracket 170 via the anchor plate 150P. The construction of the submerged structure 100 is completed as described above.

According to the press-fitting construction method used when constructing the above-mentioned sinking structure 100, the frame-like press-fitting and depositing apparatus 1 is built on the upper surface of the ground E, and the ring bodies 111 in which a plurality of segments 112 are connected in stages are stacked. The submerged body 110 is constructed by using the pressing beam 23 of the press-fitting jack 3 of the press-fitting and submersing apparatus 1 to sequentially press-fit the submerged body 110 into the ground. As a result, it is possible to omit all the work of installing and removing the protective ring, installing and removing the press-fitting and depositing device, and connecting and removing the sinking anchor, which have been repeated every time the depositing body is press-fitted and deposited. The advantage of being able to work efficiently is obtained. Further, there are advantages that work time can be shortened, labor and labor can be saved, and that work can be performed safely.

<Second Embodiment>
Next, the press-fitting and depositing apparatus 1A according to the second embodiment will be described with reference to FIGS. 14 to 21. In the following, points different from the press-fitting and depressing apparatus 1 according to the first embodiment will be described, and description of the same configurations will be omitted. The sinking device 2A of the press-fitting and depositing device 1A has a plurality of standing frames (posts) 21A, a press-fitting frame (pressing member) 22A, and a protection ring 23A. Each standing frame 21A is installed so as to surround the submerged structure 100 to be constructed at a construction point of a cylindrical submerged body 110 formed by vertically connecting a plurality of ring bodies 111.

The press-fit girder 22A is formed of a steel plate in an annular shape. The inner diameter of the ring is set to be equal to or smaller than the inner diameter of the deposit 110. The outer diameter of the ring is set larger than the outer diameter of the deposit 110. The press-fitting girder 22A is vertically movable with respect to the standing frame 21A and is horizontally supported. The press-fitting girder 22A is formed with a plurality of mounting holes (not shown) penetrating in the thickness direction, the press-fitting jack 3A is arranged in the mounting holes, and a protective member (not shown) is interposed therebetween. Fixed.

The protection ring 23A is attached to the lower side of the press-fit girder 22A, and is interposed between the protection ring 23A and the submerged body 110. Each standing frame 21A has an electric winch 24A attached to its upper part. A wire 24Aa extending from a winch 24A is connected to the end of the press-fit girder 22A. Therefore, by driving each winch 24A, the press-fitting girder 22A ascends and descends along the standing frame 21A, and along with this, each press-fitting jack 3A and the protection ring 23A ascend and descend.

As shown in FIG. 15, the press-fit jack 3A has a main hydraulic cylinder 31, an upper gripping housing 32, and a lower gripping housing 33. The main hydraulic cylinder 31 has a cylinder housing 34 and a piston 35, and a central hole 36 penetrating them. The upper grip housing 32 is fixed to the upper end of the piston 35 of the main hydraulic cylinder 31. An upper hydraulic cylinder 37 is attached to the grip housing 32. On the other hand, the lower grip housing 33 is fixed to the lower end of the cylinder housing 34 of the main hydraulic cylinder 31 via the lower hydraulic cylinder 38. Both gripping

housings

32 and 33 have

communication holes

39a and 39b which communicate with the central hole 36 of the main hydraulic cylinder 31, respectively. Both gripping

housings

32 and 33 have gripping

means

41 and 42 therein. The gripping means 41, 42 grips the tension member 5A inserted through the center hole 36 and the

communication holes

39a, 39b. The configurations of the upper gripping housing 32 and the hydraulic cylinder 37 are the same as the configurations of the lower gripping housing 33 and the hydraulic cylinder 38.

The tendons 5A are rod-shaped connected to a reaction pile, a steel rod, or a stranded wire that extends vertically from a below-described sunk anchor 150 buried in the ground, and has a circular cross section. That is, the tension member 5A extends integrally with the steel wire 152 of the sinking anchor 150, and is inserted into the center hole 36 and the

communication holes

39a and 39b of the press-fit jack 3A. The tension member 5A is not easily subjected to any special processing such as unevenness, and is generally easily available.

The characteristic of the press-fitting jack 3A lies in the gripping

means

41, 42. That is, each gripping means 41, 42 has a plurality of gripping pieces 43 and a plurality of guide frames 44 arranged corresponding to each gripping piece 43.

As shown in FIG. 16, the grip pieces 43 are radially arranged at equal angular intervals around the

communication holes

39a and 39b of the

grip housings

32 and 33, respectively. As shown in FIG. 17, each gripping piece 43 has an inner surface 43a that can be brought into surface contact with or detached from the surface of the tension member 5A. These inner surfaces 43a are curved inward. As shown in FIG. 18, each guide frame 44 has an inner surface 44a slidably in contact with the outer surface 43b of each grip piece 43, and a pair of side walls 44b surrounding the inner surface 44a. The inner surface 44a of each guide frame 44 guides the movement of each grip piece 43 with respect to the tendon 5A. As shown in FIG. 19, the outer surface 43b of each gripping piece 43 is inclined by a predetermined angle θ1 with respect to the vertical direction so as to converge downward. As shown in FIG. 20, the inner surface 44a of each guide frame 44 is inclined by a predetermined angle θ2 with respect to the vertical direction so as to converge downward.

As shown in FIG. 21, each gripping piece 43 is arranged so as to vertically contact the inner surface 44a of the corresponding guide frame 44. In this state, the inner surface 43a of each gripping piece 43 is vertically disposed so as to face the surface of the tension member 5A. Due to such an arrangement relationship, the load F received from the inner surface 44a of the corresponding guide frame 44 by each gripping piece 43 is dispersed over the entire inner surface 43a of the gripping piece 43.

As shown in FIG. 17, the grip piece 43 has a support shaft 45 penetrating in the horizontal direction. Each grip piece 43 has a through hole 43c that penetrates in the vertical direction. On the other hand, as shown in FIG. 20, each guide frame 44 has elongated holes 44c extending along the inclination of the inner surface 44a on both side walls 44b. These elongated holes 44c support the support shaft 45 of the corresponding gripping piece 43. Therefore, the movement of each grip piece 43 is guided along the inner surface 44a of each guide frame 44 by the engagement relationship between the support shaft 45 and the elongated hole 44c.

The upper and lower

hydraulic cylinders

37, 38 constitute the moving means of this embodiment. Each

hydraulic cylinder

37, 38 moves each grip piece 43 along the corresponding guide frame 44 to grip the tendon 5A. That is, as shown in FIG. 15, each

hydraulic cylinder

37, 38 has a cylinder housing 46 and a piston 47, respectively. Each piston 47 includes a plurality of rods 47 a protruding from the cylinder housing 46. The lower ends of these rods 47a are passed through the through holes 43c of the grip pieces 43 and are connected to the grip pieces 43 via bolts 48 (see FIG. 16). The cylinder housing 46 of each

hydraulic cylinder

37, 38 has a hydraulic port 46a for supplying / discharging hydraulic pressure.

The press-fitting jack 3A transmits the reaction force of the sink anchor 150 to the sinker 110 and forcibly presses the sinker 110 into the ground. In order to press-fit the deposit 110, the main hydraulic cylinder 31 and the upper and lower

gripping means

41, 42 are operated as follows.

It is necessary to operate the main hydraulic cylinder 31 and the upper and lower

gripping means

41, 42 in a series of orders. In the initial state, the main hydraulic cylinder 31 and the rods 47a of the upper and lower

hydraulic cylinders

37 and 38 respectively contract. The tension member 5A is not gripped by the gripping

means

41, 42.

Extend the rod 47a of the upper hydraulic cylinder 37 to move each gripping piece 43 of the upper gripping means 41 along the corresponding guide frame 44. As a result, the inner surface 43a of each gripping piece 43 comes into surface contact with the surface of the tension member 5A. The tension member 5A is held by each holding piece 43 of the upper holding means 41.

Extend the piston 35 of the main hydraulic cylinder 31 to move the lower holding housing 33 and the hydraulic cylinder 38 downward along the tension member 5A. At this time, the reaction force of the tension member 5A is transmitted to the press-fitting girder 22A by the lower grip housing 33, the press-fitting girder 22A is pushed down, and the deposit 110 is forcibly pressed into the ground.

Extend the rod 47a of the lower hydraulic cylinder 38 to move each gripping piece 43 of the lower gripping means 42 along the corresponding guide frame 44. As a result, the inner surface 43a of each gripping piece 43 comes into surface contact with the surface of the tension member 5A. The tension member 5A is held by the respective holding pieces 43 of the upper and lower holding means 41, 42.

The rod 47a of the upper hydraulic cylinder 37 is contracted to move each gripping piece 43 of the upper gripping means 41 along the corresponding guide frame 44. As a result, the inner surface 43a of each gripping piece 43 separates from the surface of the tension member 5A. The tension member 5A is released from being gripped by the gripping pieces 43 of the upper gripping means 41, and is gripped only by the gripping pieces 43 of the lower gripping means 42.

The piston 35 of the main hydraulic cylinder 31 is contracted to move the upper grip housing 32 and the hydraulic cylinder 37 downward along the tension member 5A. The entire press-fitting jack 3A moves downward relative to the tension member 5A, and the position of the press-fitting jack 3A becomes lower than the position in the initial state.

The rod 47a of the lower hydraulic cylinder 38 is contracted to move each gripping piece 43 of the lower gripping means 42 along the corresponding guide frame 44, and the inner surface 43a of each gripping piece 43 is moved to the surface of the tension member 5A. Disengage from. The press-fitting jack 3A returns to the initial state.

<Construction method of submerged structure>
Next, with reference to FIGS. 22 to 27, the construction method of the depositing structure 100 when the press-fitting and depositing apparatus 1A is used will be described regarding differences from the first embodiment.

As shown in FIG. 22, when assembling the main body of the press-fitting and squeezing apparatus 1A, first, a plurality of standing frames 21A are erected at predetermined positions at a position surrounding the sunk structure 100 at a construction point of the sunk structure 100. . Next, on the inner side surrounded by the plurality of standing frames 21A, the press fitting girder 22A is attached to the standing frame 21A to assemble the sinking device 2A. Then, each press-fitting jack 3A is attached on the press-fitting girder 22A, and the tension member 5A integrally connected to the steel wire 152 of the sink anchor 150 is connected to each press-fitting jack 3A. In the present embodiment, the submerged anchor 150 is located at the outer peripheral side of the submerged body 110 at a position separated by 0.5 m or more from the outer peripheral surface of the submerged body 110 and 1.0 m or more from each other. It is pre-deposited in the ground at intervals.

Next, as shown in FIG. 23, in the space formed below the press-fitting girder 22A supporting the press-fitting jack 3A, the segments 112 and the like are circumferentially connected to assemble the ring body 111 and the ring body 111 is overlapped. Then, an assembling process of assembling the submerged body 110 by connecting the two is performed. After the assembly process is completed, the press-fit girder 22A is placed on the ring body 111 via the protection ring 23A.

Next, as shown in FIG. 24, the submerged body 110 is press-fitted and the earth and sand are excavated. That is, the press-fitting girder 22A is mounted on the assembled submerged body 110 via the protection ring 23A, and each press-fitting jack 3A is operated a predetermined number of times. As a result, a press-fitting step of press-fitting the submerged body 110 or the ring body 111 together with the press-fitting girder 22A into the ground is performed.

By actuating the press-fitting jack 3A to tension the tension member 5A, pressure is applied to the press-fitting girder 22A in the direction of the ground with the fixing portion 151 as a fulcrum. As a result, the upper surface of the submerged body 110 is pressed by the press-fitting girder 22A to receive a pressure in the underground direction, and thus the submerged body 110 is pressed into the ground.

Along with the press-fitting of the submerged body 110 into the ground, the excavation process of excavating the earth and sand inside the press-fitted submerged body 110 with the bucket B is performed. At this time, the meshing of the gear mechanism of the winch 24A of the sinking device 2A is released in advance. As a result, the press-fitting girder 22A descends along with the operation of the press-fitting jack 3A together with the submerged body 110 by a predetermined height.

Next, open the sinking device 2A. That is, as shown in FIG. 25, the tension member 5A is released from the grip of each press-fitting jack 3A, and the winch 24A of the sinking device 2A is rolled up. As a result, a lift-up process is performed in which the press-fitting girder 22A is lifted up to the initial position by the press-fitting jack 3A. Since the lift-up is automatically performed, the work at a high place by the operator is omitted, and the work can be performed more safely. As a result, it is possible to improve the efficiency of the work of constructing the submerged structure 100 performed using each press-fitting jack 3A. Moreover, in addition to the function that each press-fitting jack 3A can hold the tension member 5A at an arbitrary position in the longitudinal direction of the tension member 5A by the sinking device 2A, the press-fit girder 22A can be stopped in real time at an arbitrary position. .

Next, as shown in FIG. 26, an inner scaffold A3 is installed, and an assembly process of assembling a new ring body 111 with respect to the submerged body 110 is performed. That is, a new segment 112 is placed on the press-fitted submerged body 110 to assemble the ring body 111, and the press-fitting girder 22A is placed on the ring body 111 via the protection ring 23A. The inner scaffold A3 is used for this assembly. After that, the inner scaffold A3 is removed, then the submerged body 110 is press-fitted and the earth and sand are excavated again, the press-fit girder 22A is placed on the assembled submerged body 110 via the protection ring 23A, and each press-fit jack 3A is attached. The press-fitting step of pressing the submerged body 110 or the ring body 111 together with the press-fitting girder 22A into the ground is performed again by operating the press-fitting girder 22A and the like a predetermined number of times. By repeating the above-described series of steps, the deposit 110 is forcibly press-fitted to a predetermined depth to be deposited.

It should be noted that the press-fitting girder 22A is formed with a plurality of mounting holes, and the press-fitting jacks 3A are distributed evenly with respect to the submerged body 110 at the positions of the mounting holes of the press-fitting girder 22A according to the required number of them. There is. The mounting positions of the press-fitting jacks 3A on the press-fitting girders 22A are positions equidistant from the axis P1 of the press-fitting girders 22A (see FIG. 22), and are set at equal angular intervals around the axis P1 in the circumferential direction. The position of the place.

The required pressure input at the time of press-fitting the submerged body 110 into the ground E increases as the press-fitting depth for press-fitting the submerged body 110 increases. That is, if the press-fitting depth of the submerged body 110 increases, the number of the press-fitting jacks 3A attached to the press-fitting girders 22A may be appropriately increased. The required number of press-fitting jacks 3A is determined by the maximum required pressure input calculated from the required press-fitting depth. Accordingly, even when the number of press-fitting jacks 3A used is changed according to the difference in the required pressure input to the ground E, it is possible to prevent the biased pressure input from acting on the submerged body 110, and the submerged body. It becomes possible to stabilize the work of laying 110.

Finally, concrete is poured by the plunger tremie method to form the bottom plate portion 130 at the bottom of the hole, and the bracket 170 is attached to the segment 112 of the deposit 110 exposed from the ground E. The construction of the submerged structure 100 is completed as described above.

<Other>
The present invention is not limited to the above-mentioned embodiment, and can be appropriately modified within the scope of the present invention. For example, the thickness of the lowermost stage 112 where the blade opening 120 is provided, that is, the thickness of the segment 112 at the first stage may be smaller than the thickness of the segments 112 at the second stage and above where the blade opening 120 is not provided. . In this case, the portion of the main girder 113 below the second-stage segment 112 forms an overhang-shaped step 126 (see FIG. 27).

In the above-described embodiment, it is not assumed that the submerged body 110 that has been once pressed into the ground and laid down will be pulled out from the ground, but in some cases, the submerged body 110 that has been laid underground may be pulled out from the ground. is there. In this case, as shown in FIG. 28, a steel material 119 such as a steel rod for drawing or a twisted steel wire may be provided in advance so as to penetrate the segment 112 in the vertical direction up to the closed space 123a of the blade opening 120. . Specifically, the top plate 123 that surrounds the closed space 123a of the blade opening 120 together with the outer plate 121 and the inner plate 122, and the main girder 113 and the middle main girder 115 that are present above the top plate 123 with a predetermined interval. On the other hand, the steel rod 119 is attached so as to penetrate in the vertical direction. These attachments are performed by the coupler 129. The coupler 129 for attaching the steel material 119 to the top plate 123 is a PC nut 129 a embedded in the top plate 123.

The steel materials 119 are attached to the ring body 111 at a plurality of positions at equal intervals in the circumferential direction of the submerged body 110. As the steel material 119, a PC steel rod is preferable when a steel rod is selected, a PC twisted steel wire when a twisted steel wire is selected, or a hard steel wire or a twisted hardened steel wire having a strength equal to or higher than these. Is desirable. As a material of the hard steel wire or the like, there is a hard steel wire or a hard steel wire defined by JIS G3506,3521.

The construction method for pulling out the submerged body 110 from the ground (pulling-out construction method) is performed by applying a pulling force to the steel material 119 in the vertical direction by the press-fitting jack 3A.

1,1A Press-fitting and

depressing device

2,2A Depressing device 21 Strut 21A Standing frame (strut)
22A Press-fitting frame (pressing member)
23 Roll-down beam (roll-down member)
3,3A press-fit jack (press-fit device)
31 main

hydraulic cylinder

32, 33 gripping housing 34 cylinder housing 35 piston 36

center hole

37, 38

hydraulic cylinders

39a,

39b communication hole

41, 42 gripping means 43 gripping piece 44 guide frame 46 cylinder housing 47 piston 100 sinking structure 110 sinking body 111

ring body

112, 112a segment 113 main girder 114 joint plate 116 vertical rib 117 skin plate (outer shell)
118 Protrusions 118a Friction Cut Section (Second Friction Cut Section)
120 cutting edge portion 124 friction cutting portion (first friction cutting portion)
126 step 127 joint fitting for fastening 130 bottom part 150 sink anchor 152 steel wire 170 bracket E ground

Claims

A press-fitting / depressing device is constructed by arranging a pressure-reducing member so that the pressure-reducing member can be moved up and down on the plurality of support pillars inside a space surrounded by a plurality of pillars erected on the top surface of the ground Then, a multi-stage and cylindrical deposit body is constructed on the ground upper surface below the pressing member, and at the upper end surface of the deposit body, arc-shaped segments constituting each stage are connected one by one to assemble a ring body, The press-fitting device is lowered to push down the pressing member on the upper surface of the ring body to press the deposit body downwardly by a predetermined depth, and after raising the pressing member, the segment is similarly pressed on the upper surface of the deposit body. By connecting to the ring body, the pressing member is lowered again to press the deposit body downward by a predetermined depth, and by repeating these operations, the deposit body is sequentially deposited. Press-fitting method of sinking body, characterized and.
The plurality of press-fitting devices are provided on the pressing member, and the number of the press-fitting devices to be used is changed according to the difference in the necessary press input to each ground. Press-fitting method.
A plurality of anchors are installed in the ground, the press-fitting device is attached to the anchor, and the submerged body is press-fitted into the ground by the reaction force of the steel wire of the anchor arranged on the pressing member via the press-fitting device. The concrete wire is then placed on the bottom of the excavation after completion of the excavation, and the steel wire of the anchor used at the time of press-fitting is replaced with the bracket attached to the outer periphery of the above-ground segment. Press-fitting method.
The press-fitting method according to claim 3, characterized in that the plurality of anchors are installed at a position separated by 0.5 m or more from the outer peripheral surface of the submerged body and spaced from each other by 1.0 m or more.
In order to form the lowermost ring body of the submerged body,
Temporarily connecting the suspended segments to each other,
A step of allowing the connected segments to have a predetermined length in the circumferential direction, and allowing the segments to stand on their own;
With respect to the self-supporting segment, in the state of suspending the next segment, has a step of temporarily connecting in the circumferential direction,
When the lowermost ring body is configured by the temporary connection for one round, a step of correcting the connection error using the fastening joint fitting provided on the outer surface of the segment,
A step of welding the segments forming the lowermost ring body to each other to complete the lowermost ring body,
Have,
The press-fitting method according to any one of claims 1 to 4, wherein the segment forming the lowermost ring body is provided with a blade opening portion that is attached at a factory rather than at the site.
The deposit is
A ring-shaped blade portion is installed along the lower end of the ring body at the bottom stage,
Further, a plurality of projections continuous in the vertical direction are provided on at least a part of the outer peripheral surface in the circumferential direction, and the projections have an outer shell having a substantially square shape, and the inner surface of the outer shell has an upper end of the square. The main girder welded to the edge and the lower end edge, the joint plate welded to the right end edge and the left end edge of the quadrangle on the inner surface of the outer shell, and the projecting body by the joint plate protruding outside the outer shell The press-fitting method according to any one of claims 1 to 5, which is formed.
The press-fitting method according to claim 5 or 6, characterized in that the height of the blade mouth portion is 0.5 to 1.0 m.
The deposit is
Each of the segments is long in the circumferential direction of the submerged body, main girders arranged in parallel with each other, a pair of left and right joint plates that connect the main girders at the left and right end portions, respectively, and a central portion of the main girder. And a vertical rib connected in the vertical direction, and an outer shell stretched over the main girder, the joint plate, and the vertical rib.
The thickness of each segment, that is, the sum of the main girder width and the outer shell thickness is constant in all the main girders in the same segment, and the thickness of the first-stage segment, which is the lowest stage, is two stages. The thickness of the eye segment is smaller than the thickness of the eye segment, so that the main girder portion of the segment between the first stage and the second stage forms an overhang-like step. The press-fitting method according to any one of 1 to 7.
The submerged body is provided with a blade opening portion provided around a lower end portion, and a first friction provided around an outer periphery of the blade opening portion for reducing friction generated between the submerged body and a surrounding ground. It has a cut portion and a second friction cut portion provided on the outer periphery of the middle portion in the vertical direction, and the second friction cut portion is provided on the outer periphery of the blade opening portion. The press-fitting method according to any one of claims 1 to 8, wherein the press-fitting method has a thickness smaller than that of No. 1 and a predetermined vertical dimension, and has a band-like shape protruding outward.
The second friction cut portion is provided at a distance of 8 to 11 m above the first friction cut portion in the up-down direction.
The plurality of second friction cut portions are provided, and the second friction cut portions are provided at intervals of 8 to 11 m from each other in the vertical direction. Press-fitting method.
A vertically arranged hydraulic cylinder having a central hole penetrating the cylinder housing and the piston;
Upper and lower grip housings, which are fixed to the cylinder housing and the piston, respectively, and have communication holes that communicate with the central hole, respectively, at both upper and lower ends of the hydraulic cylinder,
Gripping means provided respectively inside the upper and lower gripping housings for gripping the tension members inserted through the central hole and the communication holes,
By operating the hydraulic cylinder and expanding and contracting the piston while alternately gripping the tension member extending vertically from the reaction member by each of the gripping means, the reaction force of the reaction member is transmitted to the deposit body. In a press-fitting device for forcibly pressing the submerged body into the ground,
Each of the gripping means,
A plurality of gripping pieces arranged around the communication hole of each gripping housing and having an inner surface capable of making surface contact with or detaching from the surface of the tension member;
Corresponding to the plurality of gripping pieces, the gripping pieces are arranged on the inner surfaces of the upper and lower gripping housings and have inner surfaces slidable to the outer surfaces of the corresponding gripping pieces. Multiple guide frames to guide each,
The outer surface of each gripping piece is inclined so as to converge downward,
Slanting so that the inner surface of each of the guide frames converges downward,
A piston housed in a cylinder housing includes a plurality of rods projecting into the gripping housing for gripping the tension member by the gripping pieces, and the plurality of rods are connected to the gripping pieces. And a moving means for moving each of the gripping pieces along the inner surface of the corresponding guide frame by extending the rod and applying a force to each of the gripping pieces.
By assembling the ring body by connecting the segments in the ring circumferential direction, stacking the ring bodies on top of each other and connecting them to each other to assemble the deposit body, and applying pressure from above the deposit body while excavating the inside of the deposit body, The deposit body is press-fitted into the ground from a ring-shaped blade opening installed along the lower edge of the ring body at the lower end, a soil retaining wall is constructed by the deposit body in the ground, and after the predetermined construction is completed, A pulling-out method for pulling out the depositing body deposited by the press-fitting method according to any one of claims 1 to 10, wherein the depositing body is pulled out from the inside, and the segment, the ring body, or A pulling-out method, wherein a steel material for pulling out is attached to or placed in the deposit, and a pulling force is applied to the steel material to pull out.