JPH10220162A - A submerged body having a projection on its outer peripheral surface and a split ring constituting the submerged body - Google Patents

Abstract

(57) [Summary] To settle a submerged body 1 which is submerged in the ground and is used for constructing a structure. A projection is provided on an outer peripheral surface of a submerged body. The protrusion has a triangular horizontal cross section and is continuous in the vertical direction. If a displacement is to be caused without the laying being performed straight, the resistance to the surrounding ground 9 is increased by the projections 33 to prevent the displacement. Further, the inside of the projection is hollow, and a twisted wire 11 for an anchor for obtaining a reaction force as a press-in force for sunking is passed therethrough. Therefore, using the hollow projection 33 as a guide along the stranded wire 11,
Press-fitting is performed more straightly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for constructing a structure by submerging a submerged body in the ground.

[0002]

2. Description of the Related Art A method of laying a submerged body in the ground and constructing a structure in the ground includes, for example, a caisson method in which the ground inside the submerged body is excavated and submerged, There is a press-fitting method in which a downward force is applied to the ground to press it into the ground, or a mixture of these techniques.

[0003] One example of this press-fitting method is to drill a hole deep in the ground, inject a chemical solution into the bottom of the hole to solidify the surrounding ground together with an anchor member, and connect a PC twisted wire or PC strand connected to the anchor member. A steel material such as a steel bar is pulled by a hydraulic unit, and a reaction force of the pull is obtained as a press input.

[0004] That is, the steel material for the anchor is preliminarily arranged at a plurality of locations in the circumferential direction of the submerged body, and the tip of each steel material is connected to the top end of the plurality of girders crossed over the upper end of the submerged body in a cross-girder shape. Attached to. The upper end of the submerged body is pressed in through these girders. At this time, the steel material is pulled, and the sinking body receives a downward reaction force, and is pressed.

[0005] In addition, so that the squatting is performed smoothly,
If necessary, a fluid such as a bentonite suspension is injected between the submerged body and the ground to reduce friction with the ground.
When it is difficult to set the sinking body straight into the ground and there is a problem, the sinking body is pulled upward by a predetermined amount, and then the posture of the sinking body is controlled while balancing the respective reaction forces. Resuming the sunk while resuming. A method of repeating such pulling out and squatting and performing posture control so as to obtain a predetermined accuracy of squatting is also practically used in the caisson method.

[0006]

However, in the above-mentioned prior art, it is difficult to lay the buried body straight in the ground, and it is easy for a displacement to occur. That is, the sinking body tends to rotate in the horizontal plane in the ground, or the sinking direction tends to be shifted from the vertical direction.

In general, for example, a vertical accuracy indicating a deviation from the vertical direction is required to have an accuracy of about 1/300 or more. The rotation in the horizontal plane is performed, for example, in the case of a shaft for a shield tunnel, when the starting or reaching position of the shield machine needs to be set at a specific location on the shaft wall (a specific portion is formed of a member capable of being cut and opened. In the case of a vertical shaft wall, etc.), construction will be greatly hindered.

Further, as in the prior art, in order to pull out the sinking body upward by a predetermined amount after a shift has occurred once, a large apparatus is required, the construction cost is increased, and the construction space is increased. Was something. The present invention has been made in order to solve the above-described problems. The present invention relates to a submerged body having a protruding body on an outer peripheral surface where straight submerging can be performed, and a split ring (segment piece) having a divided structure constituting the submerged body. The purpose is to provide.

[0009]

Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is to provide a submerged body submerged in the ground, in which a projecting body continuous in the vertical direction is formed on the outer peripheral surface in the circumferential direction. A laid body having a plurality of protrusions and having a projection on an outer peripheral surface.

According to a second aspect of the present invention, the projecting body of the sinking body has a hollow inside and is used as a guide for passing a stranded wire or a rod for an anchor for obtaining a reaction force as a press force. A feature of the first aspect of the present invention is a laid body having a projection on the outer peripheral surface.

In a third aspect of the present invention, the stranded wire further comprises a P
The rod body is a stranded wire of a C steel wire, and the rod body is a PC steel rod, and is a deposited body having a projection on an outer peripheral surface thereof.

In a fourth aspect of the present invention, the submerged body has a structure in which a ring body is assembled by connecting divided rings having a divided structure in the circumferential direction of the ring, and the ring bodies are connected to each other by being vertically stacked in a plurality of stages. And a cutting body having a protrusion on an outer peripheral surface, wherein a cutting edge portion of a ring strip is installed along a lower end portion of the lowermost ring body.

According to a fifth aspect of the present invention, there is provided a split ring having a split structure, wherein the split body constitutes a submerged body, wherein a projecting body divided in advance is provided on an outer peripheral surface.

According to a sixth aspect of the present invention, there is provided an outer shell having a substantially square shape, a main girder welded to the upper and lower edges of the square on the inner surface of the outer shell, and a right edge of the square on the inner surface of the outer shell. And a joint plate welded to the left end edge, and a split ring constituting a sinking body, characterized in that the joint plate protrudes outside the outer shell to form a projection.

According to a seventh aspect of the present invention, there is provided a divided body comprising a sunk body, characterized in that at least one of the right edge and the left edge joint plates protrudes outside the outer shell to form a projection. It is a ring.

According to an eighth aspect of the present invention, there is provided a split ring constituting a submerged body, wherein the projection is formed in a flat plate shape.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. Submerged body 1 according to this embodiment
Have a cylindrical shape as a whole, and are arranged with the axial direction of the cylindrical shape in the vertical direction. This submerged body 1 assembles a steel segment as the ring body 5 by connecting steel segment pieces as the split ring 3 in the ring circumferential direction.

The ring body 5 is connected in a vertically stacked manner to form the submerged body 1 described above. At this time, the upper and lower ring bodies 5 are assembled in such a state that the positions of the constituent split rings 3 are displaced in the circumferential direction, that is, in a so-called staggered arrangement. At the lower end of the lowermost ring body 5 of the submerged body 1, a ring-shaped blade opening 7 is installed, and submersion from the blade opening 7 to the ground 9 is performed.

The submersion in this embodiment is performed not only by the gravity of the steel segment due to its own weight, but also by a force applied downward by a hydraulic unit (not shown), that is, by press-in and excavation inside the submerged body. This press-in force is obtained as a reaction force when the anchor is pulled, as in the related art. That is, a plurality of holes are drilled at predetermined positions of the place where the immersion body 1 is to be laid in advance.

This hole is drilled deep underground by a drill, and a twisted wire (wire rope) 11 for anchor is provided at the bottom.
The anchor member 13 to which is connected is arranged, and a chemical solution is further injected to solidify the surrounding ground 9 together with the anchor member 13.
After the holes are back-filled and the surrounding ground 9 is sufficiently hardened, the submerged body 1 is arranged between the plurality of twisted wires 11.

The plurality of twisted wires 11 for anchor are made of PC steel wire, and are located at a plurality of locations in the circumferential direction of the submerged body 1.
A plurality of press-fitting girders 15 are provided at the upper end of the submerged body 1 during submerging.
(FIG. 2) is passed between the sinking body 1 and the sinking body 1 via a protective ring 17 in a cross-girder manner. The tip of the stranded wire 11 is attached to the upper beam 16 passing through the center hole jack at the tip of the press-fitting girder 15. Then, the submerged body 1 is pressurized by the hydraulic unit via the press-fitting girder 15 and the protection ring 17. The protection ring 17 prevents the press-fitting force from being locally concentrated on the sinking body 1.

The upper end of the immersion body 1 receives a downward reaction force by the above-mentioned reaction force and pressure equipment, and the immersion body 1 is press-fitted.
In parallel with such press-fitting, the inside of the submerged body 1 is excavated by a bucket of an excavator (not shown).

When the first ring body 5 is laid down, the next ring body 5 is overlaid and connected from above, and press-fitting and excavation are performed again. In addition, the total length of the stranded wire 11 for the anchor is:
The full length of the submerged body 1 in the future completed state may be provided in advance, but the length of each ring body 3 or the length of several rings, that is, the length of the steel segment piece, Shall be divided by the appropriate length of direction,
When the ring bodies 3 are overlapped, they can be joined using a coupler (not shown) provided at the divided end of the stranded wire 11. It is also possible to join by threading without using a coupler.

At the time of press fitting, the peripheral ground 9 is formed by friction cut shapes 19 provided around the outside of the blade opening 7.
Is pushed outward, and a predetermined gap 21 is formed with the outer surface of the submerged body 1. By the action of the gap 21, the frictional force generated between the ground 21 and the ground 9 can be reduced. Further, a fluid such as a benite suspension is injected between the submerged body 1 and the ground 9, so that the friction is further reduced and the submersion is performed smoothly.

As shown in FIG. 3, the steel segment pieces, which are each of the split rings 3, have upper and lower curved main girders 23 which are arranged in parallel at predetermined intervals in the left-right direction. By connecting both ends of the main girder 23, two left and right joint plates 25 are arranged in parallel in a vertical direction at a predetermined interval. These main girder 23 and joint plate 25 are welded,
Further, a plurality of vertical ribs 27 are arranged and welded between the two main girders 23.

An outer shell (skin plate) 29 is welded to the outside of the main girder 23, the joint plate 25, and the vertical rib 27. The outer shell 29 has a curved surface and is substantially rectangular. The main girder 23 is welded to the upper edge and the lower edge on the inner surface of the substantially square, and the joint plate 25 is
Are welded.

The main girder 23 and the joint plate 25 are provided with bolt holes 31 for connection with the adjacent split rings 3. When connecting with bolts, it is desirable to fill a water-stopping auxiliary material (sealant) between adjacent steel segment pieces.

A projection 33 is provided on the outer peripheral surface of the outer shell 29.
Are welded. The projection 33 has a horizontal cross-sectional shape of an acute triangle, is hollow inside, and is provided at a position that is long and continuous for each split ring 3 connected vertically, that is, for each steel segment piece. The stranded wire 11 is passed through the inside of the hollow projection 33. The twisted wire 11 is housed in a tube 35 having a circular cross section (FIG. 2 (B)), the friction with the hollow inside of the projection 33 is small, and the projection 1 is sunk straight using the projection 33 as a guide. Increase the effect. In addition, the tube 35 allows the twisted wire 11
Is protected.

The lower ends of the plurality of projections 33 are formed obliquely to reduce the resistance to the ground 9. Further, a plate 37 is partially attached to the lower end,
A step is formed, and a friction cut shape 39 similar to that of the blade opening 7 is provided. A predetermined gap 41 (FIG. 2A) is formed by the friction cut shape 39,
The frictional force generated between the projection 33 and the ground 9 is reduced.

According to this embodiment, the following functions and effects are obtained. That is, if the sinking body 1 attempts to rotate in a horizontal plane or in a vertical plane to cause a deviation, the resistance of the protrusion 33 to the surrounding ground 9 increases, and such Displacement is prevented. This facilitates straightening.

Therefore, in order to obtain this effect, the protrusion amount 43 of the protrusion 33 (FIG. 2A) is determined by the gap formed by the peripheral ground 9 being pushed away by the friction cut shape 19 of the blade opening 7. Must be greater than 21. If it becomes too large, the possibility of collision with obstacles such as boulders in the ground 9 increases the possibility of hindrance.
When not used as a guide for passing the twisted wire 11 for anchors, the protrusion amount is preferably about 5 to 20 cm, and when used as a guide, it is preferably 20 cm or more.

The twisted wire 11 for the anchor is the
Then, the laying body 1 passes through the inside of the hollow protrusion 33 provided in the laying member 11, and the laying body 1 is laid down using the twisted wire 11 as a guide, so that the laying down is performed more straightly. In addition, the conventional twisted wire for the anchor is often provided at a position away from the submerged body so as not to interfere with the submerged body 1. For this reason, the balance of the press-in applied to a plurality of places by a plurality of twisted wires tends to be deteriorated.

However, according to this embodiment, since the stranded wire 11 for the anchor passes through the inside of the projection 33 as a guide, it is located without interfering with a very close position of the submerged body 1, and this position is It is maintained by the projection 33 as a guide. For this reason, even if there is some error in the magnitude of the press-in applied to a plurality of locations, the moment generated by the error, that is, the moment obtained by the press-in × the length of the girder is small, so that it is easy to balance.

In addition, the twisted wire 11 for the anchor is the
Maintaining a location in close proximity to requires less construction space. Further, when the laid body 1 is used for earth retaining or the like for performing a predetermined construction, and is pulled out after the completion of the construction, the twisted wire 11 for anchor is used as a guide at the time of drawing. Thus, the sinking body 1 can be pulled straight out. In this case, a device for pulling out is provided separately.

In the above-mentioned drawing, the stranded wire 11 for the anchor can be used as a means for transmitting the drawing force as it is. That is, the sunk submerged body 1
An operator enters the bottom of the inside, opens a part of the outer shell 29 facing the hollow projection 33, and disconnects the stranded wire 11 from this opening. Then, the lower end of the untwisted stranded wire 11 is connected to the sinking body 1. In this way, the pull-out force can be transmitted to the immersion body 1 via the anchor stranded wire 11. The disconnecting operation may be performed by the coupler.

(Other Embodiments) In the above embodiment, the twisted wire 11 for the anchor is used to obtain the reaction force as the press-in force. However, according to another embodiment, the twisted wire 1 is used.
It is possible to use a rod instead of 1. The rod is P
It can be a C steel rod. Further, in the above embodiment, the shape of the horizontal section of the projection 33 is a triangle, but other shapes can be taken as shown in FIG.

That is, they are quadrangular (FIGS. 4A and 4B) and circular (FIGS. 4C and 4D). These projections 3
3 can be hollow inside (Fig. 4 (A) (C))
In addition, it is also possible that the wire is not hollow and does not pass through the twisted wire 11 for an anchor (FIG. 4E).
When the stranded wire 11 or the like does not pass through, a thin plate material can be used as the projection 33 (FIG. 4E).
In this case, the twisted wire is locked by a conventional mounting method.

The lower ends of these projections 33 are also formed obliquely (FIGS. 4B and 4D), and a friction cut shape 39 having a step (FIGS. 4B and 4D) can be provided. . If the shape of the horizontal cross section of the projection 33 is too large, the friction with the surrounding ground 9 is increased, but if it is too small, the projection 33 may be deformed by hitting an obstacle and the predetermined effect may not be obtained. Can be Therefore, the shape and size of these horizontal sections are selected according to the surrounding conditions such as the ground 9.

In the above embodiment, four projections are provided, but in other embodiments, three projections may be provided, or five or more projections may be provided. Preferably 4 ~
It is about six, and at most about eight.

In the above embodiment, the immersion body 1
Is constituted by a steel segment which is a split ring 3, but in another embodiment, an integral ring body 5 manufactured in a factory may be used. In addition, the entire submerged body 1 can be manufactured in a factory in advance.

In the above embodiments, the steel segment pieces as the split rings 3 are connected by bolts. However, in other embodiments, welding can be performed.

In the above embodiment, the protrusion 3
3 is long continuous with each of the divided rings 3 connected vertically, that is, each steel segment piece, but in other embodiments, it is not continuous long and only vertically extends on a part of the submerged body 1. May be provided continuously.
The blade opening 7 is effective as a part of the submerged body 1.

In the above embodiment, the protrusion 3
3 was welded to the outer peripheral surface of the outer shell 29,
In another embodiment, as shown in FIGS. 5 to 7, the projection 33 may be formed by using a part of the joint plate 25. In these figures, parts having the same functions as those in FIGS. 1 to 6 are denoted by the same reference numerals.

That is, the split ring 3 shown in FIGS.
The main girder 23 is welded to the inner surface of an outer shell 29 having a substantially square shape, and the main girder 23 is welded to the upper edge and the lower edge of the square, and the joint plate 2 is attached to the right edge and the left edge.
5 are welded. One of the two joint plates 25 projects outside the outer shell 29 to form a projection 33.

By forming the projections 33 using the joint plate 25 in this manner, the work of separately welding and providing the projections 33 becomes unnecessary, and the cost of the split ring 3 can be reduced.

Further, in the embodiment shown in FIGS. 5 to 7, the projecting body 33 projects the joint plate 25 outward as it is, and has a flat plate shape. However, in other embodiments, the protruding portion can be bent.

Further, in the embodiment shown in FIGS. 5 to 7, the split rings 3 are arranged in a staggered manner, so that the projections 33 are only partially formed in a staggered manner when viewed from the whole of the submerged body 1. It is continuous. However, in another embodiment, it is also possible to add a projection of the same shape between these partial projections by welding so as to be vertically long and continuous as viewed from the entire submerged body 1.

[0048]

As described above, in the first, second, third, or fourth laid-down body according to the present invention, the laid-down body is grounded by the function of the projections provided continuously in the vertical direction. It is easier to be done straight inside. That is, in the case where the sinking body rotates in a horizontal plane and tries to shift in the ground, or when it rotates in a vertical plane and tries to shift from the vertical direction, the protrusion increases the resistance and prevents the shifting. .

According to the second aspect of the present invention, since the protrusion is used as a guide for passing the twisted wire or rod for anchoring, the submerged body is straightened in the ground along the twisted wire or rod. Is sunk.

According to the fifth aspect of the present invention, since the projections are provided in advance on the split ring constituting the submerged body, the split rings are simply connected at the site in the same manner as in the related art, so that the outer peripheral surface is formed. In this way, it is possible to obtain a deposited body having a projection.

According to the sixth, seventh, or eighth aspect,
Furthermore, a joint plate constituting a split ring can be used for the projection, and the cost of the split ring can be reduced as compared with a case where the projection is newly welded to the outer shell.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the present invention, and is a perspective view schematically illustrating an entire submerged body.

2A is a longitudinal sectional view showing a main part on one side of FIG. 1, FIG. 2B is a horizontal sectional view showing a main part of FIG. 1A, and FIG. It is a perspective view which shows a lower end.

FIG. 3 is a perspective view of a steel segment piece constituting the sinking body of FIG. 1;

4A and 4B show another embodiment, in which FIG.
(B), (B) is a perspective view of (A), (C)
FIG. 2B is a view corresponding to FIG. 2B, FIG. 2D is a perspective view of FIG.
(E) is a diagram corresponding to FIG. 2 (B), and (F) is a perspective view of (E).

FIG. 5, which shows another embodiment of the present invention, is a perspective view schematically showing the entirety of a submerged body.

FIG. 6 is a perspective view of a steel segment piece constituting the submerged body of FIG. 5 as viewed from the outside.

FIG. 7 is a perspective view of the steel segment piece of FIG. 6 as viewed from the inside.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deposited body 3 Split ring (steel segment piece) 5 Ring body 7 Cutting edge 11 Twisted wire 15 Press-fitting girder 16 Upper beam 17 Protective ring 33 Projection

Claims (8)

[Claims] 1. A submerged body submerged in the ground, wherein a plurality of vertically continuous protrusions are provided on an outer peripheral surface in a circumferential direction, the submerged body having a protrusion on an outer peripheral surface. 2. The projecting body of the sinking body has a hollow inside and is used as a guide for passing a twisted wire or rod for an anchor to obtain a reaction force as a press-in force. A submerged body having a protrusion on the outer peripheral surface according to the above. 3. The set body according to claim 2, wherein the twisted wire is a twisted wire of a PC steel wire, and the rod is a PC steel rod. 4. The submerged body is constructed by connecting divided rings having a divided structure in the circumferential direction of the ring to assemble a ring body, and connecting the ring bodies by stacking a plurality of the upper and lower parts in a vertical direction. A ring-shaped blade opening is installed along a lower end portion of the lower ring body.
Or a submerged body having a protrusion on the outer peripheral surface according to 3. 5. A split ring for forming a submerged body submerged in the ground having a plurality of vertically extending projections provided on an outer peripheral surface thereof in a circumferential direction, the projections being divided in advance. Is provided on the outer peripheral surface. 6. An outer shell having a substantially square shape, a main girder welded to the upper and lower edges of the square on the inner surface of the outer shell, and a right and left edge of the square on the inner surface of the outer shell. 6. The split ring according to claim 5, wherein a projection is formed by welding the joint plate and projecting the joint plate outward from the outer shell. 7. The split ring according to claim 6, wherein at least one of the right end edge and the left end edge joint plate projects outside the outer shell to form a projection. 8. The split ring according to claim 6, wherein the projection has a flat plate shape.