JP2000240078A - Submerged caisson connecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute the final connection of submerged caissons even at a deep depth almost without requiring the diving work at a low cost in the execution of a submerged tunnel. SOLUTION: A final submerged caisson 10 to be sunk last is sunk between two existing caissons 1, 2, and it is hydraulically connected to one existing caisson 1. A tubular water stop tube member 20 outwardly inserted to the end section of the final submerged caisson 10 is moved to the existing caisson 2 side so that the end section of the final submerged caisson 10 is inserted to the rear end side of the water stop tube member 20 and the end section of the existing caisson 2 is inserted to the tip side. The gap between the inner periphery of the water stop tube member 20 and the outer peripheries of the final submerged caisson 10 and the existing caisson 2 is set to a water stop state. The water between the final submerged caisson 10 and the existing caisson 2 is drained, and the bulkheads of the final submerged caisson 10 and the existing caisson 2 are removed. The final submerged caisson 10 and the existing caisson 2 are connected by the aerial work, thereby the main underwater work for the final connection is only the movement of the water stop member 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting buried boxes to connect buried boxes, and more particularly to a buried box which can be suitably used for final connection for connecting buried boxes last in the construction of a buried tunnel. Regarding connection method.

[0002]

2. Description of the Related Art Generally, in the construction of a buried tunnel, for example, a shaft is provided at each of the right and left ends of the buried tunnel to be constructed, which is a point of contact with a tunnel on the land side. In addition to the submerged box, the existing submerged box (submerged box) is connected to the submerged box (submerged box) to be submerged later. And
The burial tunnel can be extended by connecting and burying the burial boxes sequentially.

At present, as a general method for connecting the submerged boxes, hydraulic joining is used. That is,
In the hydraulic joining method, a sinking box is laid down at a position slightly distant from the existing box so as to be connected to the existing box, and the sinking box arranged at a position slightly distant from the existing box is drawn by the jacking jack. The end face of the box is brought into contact with the end face of the sinking box. The end faces of the existing box that are joined to the sunk box and the left and right end faces of the sunk box are each in a state in which the openings serving as tunnels are closed by the bulkhead.
A rubber gasket serving as a water-stopping material is annularly disposed on the outer peripheral edge of the joining end surface of the existing box or the submerged box.

Therefore, when the end face of the existing box is brought into contact with the end face of the existing box, the space between the bulkhead on the end face of the existing box and the bulkhead on the end face of the new box is stopped by the gasket. To be cut off from the outside. In this state, when the water is drained from the space and the inside of the space is set to about atmospheric pressure, the sunk box and the existing box are joined by the hydrostatic pressure from the outside. Then, in this state, the above-mentioned bulkhead is removed, and the existing box and the sinking box are joined by aerial work. In addition, in a joint structure between an existing box and a submerged box, a flexible joint (soft joint) that can absorb a cross-sectional force generated by an earthquake, hardening shrinkage, uneven settlement, temperature change, and the like is generally used. Used. As the flexible joint, the rubber gasket as a compression resistance member (functioning as a water blocking material in hydraulic joining),
A combination of a connecting cable (PC cable) as a tensile resistance member is often used.

[0005] In addition, when the buried box is sequentially connected from one of the shafts, and finally, the buried box and the other shaft are connected, or the buried box is sequentially connected from both the shafts, and finally, both the shafts are connected. In the case of joining buried boxes extended from, that is, in the final connection, the hydraulic joining to draw and join the buried boxes as described above cannot be used as it is, for example, a water stop panel method is used. Had been. In the water stop panel method, the connection between the buried boxes or the connection between the buried box and the shaft is covered with a water stop panel, water is discharged from the connection part covered with the water stop panel, and submerged by aerial work. The boxes were connected to each other or the buried box and the shaft.

However, in the above waterproofing panel method,
As the primary water stoppage, the divers had to fasten a plurality of water stop panels one by one, increasing the dive work and making it difficult to construct at deep depths. In addition, since a plurality of water stop panels are used, water leaks from the connection parts between the water stop panels, particularly at the corner parts when covering the ends of the submerged box having a rectangular cross section. Had to be prevented.

Therefore, terminal block construction, V-block construction, and sliding coupler construction have been developed as final connection methods that require almost no diving work. In the above terminal block method, the terminal block built in the existing sunk box or shaft is slid toward the existing sunk box connected to the sunk box or shaft, and the terminal block and the latter sunk box are hydraulically moved. It is to join. Further, the terminal block and the former buried box or shaft incorporating the terminal block are fixed in a state where the entire final connection part including the terminal block is drained.

[0008] In the V-block method described above, two wedge-shaped gaps are formed between the two existing boxes with the end faces of the two existing boxes being opposed to each other as slopes. When a wedge-shaped V-block is inserted and the inside of the V-block is drained to about atmospheric pressure, the water pressure difference between the upper and lower surfaces of the V-block caused by the difference in the area of the upper and lower surfaces and its own weight causes V The joint surface of the block and the end surface of the existing box are brought into close contact (a type of hydraulic joining). Then, the V block and the existing box are joined in a state where the inside of the V block is drained.

In the above-mentioned sliding coupler method, the coupler extrapolated in the final immersion box is slid to the existing box, and the coupler and the existing box are hydraulically joined. In addition, the coupler and the final sunk box were temporarily fixed by sliding the coupler and returning to make a shear key when joining with the existing box, and the entire joint between the existing box and the final sunk box was drained. Finally fixed in state.

[0010]

In the terminal block method, the V block method, and the sliding coupler method, diving work does not increase as in the water stop panel method, but is compared with the water stop panel method. Therefore, there was a problem that the connection structure and the construction became complicated, and the cost became higher than that of the waterproofing panel construction method.
In other words, in the terminal block method, it is necessary to previously incorporate a terminal block so as to be slidable in the buried box or the shaft, and the terminal block is provided with a bulkhead in the same manner as the buried box. Was complicated. In addition, it is necessary to draw the terminal block to the existing box with a jack, etc., and to hydraulically join it as in the case of buried boxes, and to join the terminal block to the shaft or buried box that contained the terminal block. Need to
The joining operation was complicated.

In the sliding coupler method, it is necessary to extrapolate the coupler to the final immersion box in advance so as to be slidable, and the coupler is provided with a bulkhead in the same manner as the immersion box. The sleeves and coupler support were provided in addition to the part, and the structure was complicated. Also, it is necessary to draw the coupler to the existing box with a jack or the like and to hydraulically join it as in the case of buried boxes, and to join the coupler with the final buried box to which the coupler was attached. However, the joining operation has been complicated. Therefore, the cost was also higher in the coupler method than in the water stop panel method.

The V-block method can have a simpler structure than the terminal block method and the sliding coupler method if the V-block is not provided with a bulkhead. In, both ends of the V-block are joined to the existing box by a kind of hydraulic joining, respectively, and both sides of the V-block, that is, joining to the existing box at two locations are required. Further, in the final joining, it is necessary to fit a V block having no sliding mechanism such as the terminal block or the coupler into a gap between two existing boxes having an error such as a construction error. Therefore, even if a certain error can be absorbed by the shape of the wedge, there is a possibility that it is necessary to process the manufactured V block to cope with the above error.
The production of blocks becomes complicated. From the above, high cost was required also in the V block method.

The present invention has been made in view of the above circumstances, and provides a low-cost submerged box connection method which can be applied to final joining with almost no need for diving work, and has a simple structure and construction method. The purpose is to do.

[0014]

According to a first aspect of the present invention, there is provided a method for connecting a buried box to a buried box which is to be joined to one another before submerging the buried box in one of the two buried boxes. A water-stop cylinder member mounting step of attaching a cylindrical water-stop cylinder member that is substantially along the outer periphery of the immersed box and has both ends opened, with the joint end of one buried box inserted into the water-stop box member, In a state where the two immersion boxes are opposed to each other with an interval therebetween, by moving the water-stopping cylinder member from one immersion box toward the other immersion box, one immersion is provided at the rear end side of the water-stopping cylinder member. The joining end of the box is inserted, and a water stopping cylinder member moving step in which the joining end of the other buried box is inserted on the tip side of the water stopping cylinder member, and then the inner peripheral surface of the water stopping cylinder member With the outer surface of one of the submerged boxes in a watertight state, By shutting off the inner peripheral surface of the water-stop cylinder member and the outer peripheral surface of the other immersion box, after shutting off the space surrounded by the water-stop cylinder member between the immersion boxes and the outside, A drain step of discharging water from the space; and a joining step of joining the buried boxes inside the drained inside of the water-stop cylinder member.

[0015] According to the above-mentioned method of connecting a buried box, the connecting part of the two buried boxes to be connected is attached to one of the buried boxes to be connected before the buried box is sunk. Since the water-stop cylinder member for covering and stopping the water is formed in a cylindrical shape along the outer periphery of the submerged box, as in the conventional water-stop panel method, multiple water-stop panels are placed between two submerged boxes. There is no need to stop the water, and there is no joint between the water stop panels due to the dive work. As a matter of course, even if the buried box has a rectangular cross section, there is no occurrence of a joint between the water stop panels due to the diving work at the corner. Therefore, when the junction between the buried boxes is covered with the water-stop cylinder member and water is stopped, water leakage can be reliably prevented. Also, since it is possible to reliably prevent water leakage at the joints between the buried boxes as described above, the final joining between the buried boxes, that is, when performing the above-mentioned joining step, the bulkhead of the buried boxes is prepared for water leakage It is not necessary to perform the removal without removing, and the removal can be easily performed in a state where the bulkhead formed on the joint end face portion of the immersion box is removed.

In addition, the main underwater work only involves sliding the water-stop cylinder member from one submerged box to the other submerged box, which greatly reduces diving work as compared with the conventional water-stop panel construction method. Can be. Also, if there is a mechanism that allows sliding movement of the water-stop cylinder member and water-stop work on the inner peripheral side of the water-stop cylinder member and the outer peripheral side of the joint end portion of the two immersion boxes from the inside of the immersion box or a ship on the water, It is possible to eliminate diving work almost completely. Then, if there is almost no diving work or a short work in a short time, the joining work of the buried box can be easily performed at a deep depth.

The water-stopping cylinder member is a member for covering the space between the two immersion boxes and stopping the water, and is configured to be hydraulically bonded to the end face of the immersion box, that is, the bulkhead is not required, Since it is a simple cylindrical structure, its manufacturing cost can be extremely low as compared with the above-described terminal blocks and couplers. Also, compared to the above-mentioned V block, the V block finally functions as a part of the body of the submerged tunnel, whereas the water-stop cylinder member does not depend on the strength of the submerged tunnel. Since it is only necessary to have a strength that can stop the water at the joint during joining, that is, it is a member that becomes unnecessary if the two submerged boxes are completely joined, so the water-stop cylinder member can be manufactured at lower cost .

Further, in the buried connection method using a water-stopping cylinder member, a hydraulic connection such as a terminal block or a coupler is not required, and a slightly special hydraulic connection is performed at both end surfaces like a V block. There is no need to
It is sufficient to drain the joint between the buried boxes while the joint between the buried boxes is stopped using the water-stopping cylinder member, and then join the buried boxes by aerial work. Further, in the present invention, the joints between the skeletons are formed at only one joint portion between the two buried boxes. Therefore, according to the present invention, compared with the terminal block method, the sliding coupler method, and the V-block method, which require joining the skeleton at two places, the construction can be made extremely simple and the construction cost can be reduced. Can be. In addition, even if there is an error such as a construction error in the interval between the two immersion boxes or the orientation of the two immersion boxes, if the width and the inside diameter of the water stop cylinder member have enough space, the water stop cylinder member will slide. The above error can be absorbed when moved.

According to the buried box connection method of the second aspect of the present invention, in the buried box connection method of the first aspect, the apparent specific gravity of the entire watertight cylinder member is adjusted for the watertight cylinder member. And a cavity is formed.

According to the above configuration, the cavity provided in the water-stop cylinder member acts as a float, and the specific gravity of the entire water-stop cylinder member can be reduced, so that the water-stop cylinder member is moved from one immersion box to the other. Can be easily moved. In consideration of workability, it is preferable that the water-stop cylinder member does not float on the water, and it is preferable that the apparent specific gravity of the entire water-stop cylinder member slightly exceeds the specific gravity of water or seawater. .

According to a third aspect of the present invention, there is provided a method for connecting a buried box according to the first or second aspect.
The buried box and the water-stop cylinder member have a rectangular cross section, and at least a portion of the inner peripheral surface of the water-stop cylinder member that is arranged in an overlapping state with the buried box, and at least an outer peripheral surface of the buried box. The corners of the four corners are formed in a state in which the corners of the four corners are rounded in a substantially arc shape in a portion arranged in an overlapping state with the water blocking cylinder member.

According to the above construction, a portion of the immersed box having a rectangular cross section arranged so as to overlap with the water-stopping cylinder member, for example, an end to which the water-stopping cylinder member of one immersion box is attached and the other immersion box When the water-stopping cylinder member is moved, the end of the water-stopping cylinder member is inserted into the water-stopping cylinder member, and the outer peripheral corner is in a state where R is attached. On the other hand, even on the inner peripheral surface of the water-stopping cylinder member formed in a cylindrical shape along the outer circumference of the immersed box having a rectangular cross section, a state in which R is attached to a corner of a portion arranged to overlap the immersed box Becomes Therefore, when the end of each submerged box is inserted into the water-stopping cylinder member, there is no corner in the space provided on the inner peripheral surface of the water-stopper cylinder member and the outer peripheral surface of the submerged box. When filling a water-stopping material such as a mortar for use, it is possible to prevent a state where filling is insufficient at a corner portion. Therefore, with such a configuration, the water stopping performance of the water stopping cylinder member can be improved.

According to a fourth aspect of the present invention, there is provided a method of connecting a buried box according to the first, second or third aspect, wherein the joint end face of the buried box which is first sunk among the two buried boxes is used. It is characterized in that it is a slope that retreats upward, and that the joint end face of the buried box that is submerged later is a slope that recedes downward.

According to the above construction, of the two submerged boxes to be joined, the submerged box (existing box) to be submerged is retracted as the joint end face with the submerged box (submerged box) to be submerged moves upward. It is a slope that recedes as the joining end face that is joined to the existing box of the above-mentioned sunk box goes down, so when the sunk box is approached while sinking the existing box, The contact with the box can be prevented. In other words, the sinking box is basically sunk in a state inserted into the space between the two existing boxes, but at this time, a certain amount of clearance is required so that the sinking box does not contact the existing box become.

Here, the existing box (another existing box) which is not included in the two buried boxes to be joined out of the two existing boxes, and the sunk box are, for example, the same hydraulic pressure as the conventional one. If they are joined by joining, the sinking box will be drawn to another existing box side. Accordingly, the distance between the two sunk boxes to be joined, the sunk box and the existing box, is further increased, and a relatively wide space is provided between the sunk box and the existing box. Here, as described above, when the joining end faces of the existing box and the sunk box are inclined as described above, when the sunk box is sunk, the gap between the existing box and another existing box is The upper part of the box is widened by the slanted end face of the existing box, while the lower part of the sunk box is narrowed by the slanted end face.
It is possible to make it difficult for the sinking box and the existing box to contact each other when sinking the sinking box.

As a result, the above-mentioned clearance can be reduced, and the distance between the submerged box and the existing box can be reduced. Therefore, since the length of the joint portion when joining the sinking box and the existing box can be shortened, the strength of the joint portion is increased, and the structure of the joint portion can be simplified. For example, when joining a submerged box and an existing box using post-cast concrete, the joint length is shortened, so that the amount of post-cast concrete can be reduced and a structure to reinforce the joint section Can be simplified (for example, diaphragm reinforcement is not required), and the cost can be further reduced.

According to a fifth aspect of the present invention, there is provided a method for connecting a submerged box according to any one of the first to fourth aspects, wherein one of the two submerged boxes to be connected is submerged. The box is replaced by a cylindrical connecting portion provided in the shaft.

According to the above configuration, the present invention can be applied even when the final joint is a connection between the buried box and the shaft, and in this case, the effect according to any one of claims 1 to 4 can be obtained. Can be played. In addition, the connection part of the shaft may be replaced in advance with one sunk box to which the water-stopping tube member is attached, or may be replaced with the other sunk box in which the water-stopper tube member is not attached in advance. In attaching the water bottle member, it is preferable that the water stop member is attached to the submerged box, and it is preferable that the connecting portion of the shaft is replaced with the other submerged box.
In addition, in the case where the configuration according to claim 4 is provided, the shaft is installed before the sunk box serving as the final sunk box, so the connection part of the stake is the same as the existing box of the two sunk boxes. Instead, the connecting end surface of the cylindrical connecting portion of the shaft is a slope that retreats upward as it goes upward. The connection part of the shaft is for connecting the buried box and the shaft,
For example, if you replace the other submerged box with a shaft connection,
The connection part of the shaft will be formed in substantially the same shape as the connection end of the other buried box.

[0029]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention; In addition,
In this example, the buried box connection method of the present invention is applied to the final joining of the buried box.Here, before describing the buried box connection method, the buried tunnel using the buried box connection method of this example is used. An outline of the construction and a submerged box and a water-stop cylinder member (water-stop collar) used in the submerged-box connection method will be described. FIG.
FIG. 2 shows an outline of the installation of the final immersion box in this example of the immersion box connection method, and FIG. 2 shows an outline of the final immersion box and the water stop cylinder member of this example. In the construction of this example of a buried tunnel, a buried box is connected from one shaft (not shown) by a known method, and the last buried box (existing box 1) of the connected buried boxes is shown in FIG. )
This is illustrated in FIG. The other shaft (not shown)
In FIG. 1 (A) and FIG. 1 (B), the sunk boxes (existing box 2) at the end of the sunk boxes sequentially connected from the other shaft are shown.

As shown in FIG. 1A, a space is provided between these two existing boxes 1 and 2 so that the last buried box (final sunk box 10) can be laid. Between the first and the second, as shown in FIG.
Is to be sunk. Then, after the final settling box 10 is sunk and arranged between these two existing boxes 1 and 2, the existing box 1 and the final settled box 10 are connected using the above-described hydraulic joining. Next, the final immersion box 10 and the existing box 2 are connected by the immersion box connection method of the present invention. That is, in this example, the final sunk box 10 and one of the two existing boxes 1 and 2 are two sunk boxes connected by the sunk box connection method of the present invention. And
In this example of a submerged box connection method, as shown in FIG. 2, a water stoppage cylinder member 20 manufactured on land is attached to the final submerged box 10 in advance. In this case,
The end of the final settling box 10 on the existing box 2 side is inserted into the water blocking cylinder member 20.

In the construction of the submerged tunnel as described above, other submerged boxes (including the existing box 1) except for the final submerged box 10 and the existing box 2 finally connected to the submerged box 10 are well known. Buried box. The submerged box including the final submerged box 10 and the existing box 2 to be finally connected is basically a known one such as a reinforced concrete (RC) structure system, a steel shell system (RC structure), a steel concrete composite structure system, or the like. It has a structural form, and in particular, it may be a submerged box of any structural form.

Then, the final settling box 10 is the existing box 2
The structure is the same as that of the other submerged boxes described above, except for the end portion to be finally joined. The end of the final sinking box 10 is, for example, an inclined surface that retreats as the end face goes downward, as shown in FIGS. 3 and 6. That is,
When comparing the top plate portion 11 and the bottom plate portion 12 of the final settling box 10 which is a rectangular parallelepiped box, the top plate portion 11 extends longer toward the existing box 2 adjacent to the bottom plate portion 12. The left and right side wall portions 13 correspond to this.
(Illustrated in FIG. 2 (C)) and the end of the inner wall portion 13a disposed inside the buried box along the side wall portion 13 and the bulkhead 14, the upper side of the lower side facing the existing box 2 side. It is inclined so as to protrude.

Further, the outer periphery of the end of the final sinking box 10 inserted into the water-stopping cylinder member 20 is filled with mortar as a water-stopping material substantially along the circumferential direction as described later. Groove 15 is formed. The groove 1
The portion formed on the side wall portion 13 of the sinking box 10 of FIG. 5 is formed diagonally corresponding to the slanted end of the sinking box 10 as described above, and is formed on the top plate 11 of the groove 15. The formed portion is disposed forward of a portion formed in the bottom plate portion 12 of the groove portion 15. Further, the water-stopping material is not limited to mortar, but is preferably a material that cures without shrinking after filling the groove portion 15. Therefore, when using mortar as a water-stopping material, it is preferable to use well-known non-shrink mortar or expandable mortar. As shown in FIG. 2C, at least the outer periphery of the end of the final settling box 10 (the part inserted into the water-stopping cylinder member 20) on the side joined to the existing box 2 has a rectangular cross section. The corners of the four corners of the final sinking box 10 are rounded.

Then, in the inside of the groove 15,
A rib 16 made of a steel material in which one end is buried in concrete in a steel shell at the end of 0 is disposed so as to reinforce the mortar portion filled in the groove 15. In the groove 15, a plurality of water-stopping material filling pipes 17 for communicating concrete inside the submerged box 10 and filling the groove 15 with the inside of the submerged box 10 and the groove 15 are arranged.

An annular packer 18 is provided along the outer periphery of the sinking box 10 so as to surround the front side and the rear side of the groove 15.
18 are arranged. The packers 18, 18 do not extend completely in the circumferential direction like the groove 15, but are inclined at the side wall 13. And Packer 1
8 is an elastic member (for example, various rubbers and various synthetic resins)
And is swelled by filling the inside with a fluid (for example, a liquid such as air or water). In addition, the portion where the packers 18, 18 are arranged on the outer periphery of the end of the settling box 10 is recessed in a groove shape. Before the packers 18, 18 are inflated, the packers 18, 18 are settled. The housing 10 is housed and protected in a groove-shaped concave portion on the outer periphery.

The packers 18, 18 function as a kind of mold when filling the groove 15 with mortar. That is, when the mortar is filled in the groove portion 15, in practice, the outer peripheral side of the groove portion 15 is surrounded by the water stop cylinder member 20, and the gap between the inner periphery of the water stop cylinder member 20 and the outer periphery of the sinking box 10 is formed. At this time, the two packers 18 are inflated at this time, so that the packers 18 are provided at the front and rear sides of the groove 15 at the outer periphery of the end of the sinking box 10 and the water-stopping cylinder member. The space between the inner periphery of the housing 20 and the inner periphery of the housing 20 is closed over the entire periphery of the submerged box 10. A fluid filling pipe 19 for filling a fluid into the packers 18, 18 from inside the sediment box 10 is connected to the packers 18, 18.

The end of the existing box 2 to be finally joined to the siding box 10 has a slope which is set back so that the end face thereof goes upward, corresponding to the end of the sloping box 10 which is slanted.
That is, when the top plate portion 3 and the bottom plate portion 4 of the existing box 2 which is a rectangular parallelepiped box are compared, the bottom plate portion 4 is
It is in a state of extending longer toward the final immersion box 10 which is more adjacent, and correspondingly, left and right side walls (not shown) and inner walls arranged inside the immersion box along the side walls. The end of the portion 5 and the bulkhead 14 are slanted so that the lower side projects from the upper side toward the submerged box 10 side. Thereby, when the existing box 2 is sunk first and the siding box 10 is sunk, the end of the existing box 2 and the end of the siding box 10 are engaged with each other, that is, the end face of the existing box 2 The end surfaces of the and the sinking box 10 are arranged in a substantially parallel and close proximity to each other.

On the outer periphery of the end of the existing box 2 on the side of the submerged box 10, similarly to the end of the submerged box 10 on the side of the existing box 2, a groove 15 filled with a waterproof material (for example, mortar) is provided. A plurality of water-stopping material filling pipes 1 for filling the water-stopping material from inside the existing box 2 into the ribs 16 provided in the groove portions 15 and the groove portions 15
7, a packer 18 acting as a mold as described above, and a fluid filling pipe 19 for filling the packer 18 with a fluid are provided. Various components provided on the outer periphery of the end of the existing box 2 have the same reference numerals provided on the submerged box 10 except that the oblique direction is reversed with respect to the circumferential direction. It has almost the same structure. In addition, when the water-stopping cylinder member 20 is moved from the submerged box 10 toward the existing box, the existing box 2 comes into contact with the front end surface of the water-stopping cylinder member 20 to further move the water-stopping cylinder member 20. A stopper 7 that regulates and positions is formed to surround the end of the existing box 2 along the groove 15 and the packer 18.

The position of the stopper 7 is inside the groove 15 and the packer 18. When the front end surface of the water-stopping cylinder member 20 is in contact with the stopper 7, the groove 15 and the packer 18 are moved to the position of the water-stopper member. 20. In addition, at least the outer periphery of the existing
(The water-stopping cylinder member 20 as described later)
) Are rounded at the corners of the four corners in the same manner as in the case of the final sinking box 10. Further, in the existing box 2 and the submerged box 10, their ends joined to each other have a structure having a steel shell and, as described above, outside the end faces that are oblique so as to be substantially parallel to each other. The periphery has a protruding shape.
That is, the projections 10a and 2a are formed in a ring shape as a whole in a portion of the top plate 11 (3), the bottom plate 12 (4), and the side wall 13 corresponding to the outer peripheral edge of the end face.

The water-stopping cylinder member 20 has a cylindrical shape substantially along the outer periphery of each end of the submerged box 10 and the existing box 2 which are joined to each other. Ends of the submerged box 10 and the existing box 2 can be inserted. That is, the water-stopping cylinder member 20 is formed in a cylindrical shape having a shape slightly larger than the outer periphery of the end of the submerged box 10 and the existing box 2 having substantially the same shape except that the water-stopping cylinder member 20 is obliquely inverted. It is formed in a rectangular frame shape in cross section corresponding to the sinking box 10 and the existing box 2 having a substantially rectangular cross section.

The top plate 21 of the water-stopping cylinder member 20 is formed on the existing box 2 side from the bottom plate 22 corresponding to the slanted ends of the submerged box 10 and the existing box 2, and FIGS. FIG.
As shown in FIG. 5, the side plate portion 23 is formed obliquely. In the water stop cylinder member 20, the top plate portion 21, the bottom plate portion 22, and the side plate portion 23 have substantially the same rectangular cross section. In addition, the top plate portion 21, the bottom plate portion 22, and the side plate portion 2
3, the width of the siding box 10 is set in a state where the squatting box 10 and the existing box 2 are arranged at a position where the final joining is performed, as shown in FIG.
, And has a width such that the rear end portion is arranged to overlap with the sinking box 10 and the front end portion is arranged so as to overlap with the existing box 2. Then, in a state where the submerged box 10 and the existing box 2 are arranged at the position where the final joining is performed, the gap between the submerged box 10 and the existing box 2 can be completely surrounded and covered.

On the inner surface of the water-stopping cylinder member 20, the water-stopping cylinder member 20 is moved from the sinking box 10 toward the existing box 2 as shown in FIG. 2, grooves 24 and 25 are formed at a position facing the groove 15 of the sinking box 10 and at a position facing the groove 15 of the existing box 2, respectively. That is, annular grooves 24 and 25 are formed on the inner peripheral surface of the water blocking cylinder member 20 on the rear side and the front side, respectively. Further, ribs 26 are formed in the grooves 24 and 25 in a state where the ribs 26 are joined to the water-stop cylinder member 20 as in the case of the groove 15. In addition, a groove 2 formed on the inner peripheral surface of the water-stop cylinder member 20 is provided in an upper portion of the water-stop cylinder member 20, for example, in the top plate 21.
Drainage pipe 27 penetrating from 4, 25 to the outer peripheral surface (upper surface)
Are formed.

The water-stop cylinder member 20 has, for example, a state of being surrounded by a steel material, that is, has a steel shell structure, and has a cavity therein. The specific gravity of the water-stop cylinder member 20 is adjusted by the cavity, and the water-stop cylinder member 2 is adjusted.
The overall apparent specific gravity of 0 is slightly heavier than seawater (water when constructed in freshwater). Also,
In the waterstop cylinder member 20 having a steel shell structure having a cavity inside, in order not to be crushed by water pressure and not to be deformed by its own weight or the like when placed on land.
It is preferable that a reinforcing member (may be a truss structure) such as a column, a beam, a wall, a rib, or the like is disposed inside. Also,
When the mortar is filled in the groove portions 24 and 25 of the water-stopping cylinder member 20 as a water-stopping material as described later, pressure is applied by the mortar. Therefore, it is preferable that this portion is also reinforced. Further, the water-stop cylinder member 20 may be configured such that a portion that functions as a float with a hollow inside is provided in a portion that functions as a water-stop member. In addition, on the inner peripheral surface of the water-stopping cylinder member 20, the four corners are rounded as shown in FIG.

Next, an example of the method of connecting a buried box will be described in detail with reference to the flowchart of FIG. First, in this example, as described above, the existing box 1 and the existing box 2
It is assumed that all of the submerged boxes up to have been submerged. Until these submerged boxes are submerged, the production of the final submerged box 10 and the water-stop cylinder member 20 will be advanced. Then, the water blocking cylinder member 20 is in a state in which a work such as welding is performed on the ground and is formed in a tubular shape.

By forming at least the water-stop cylinder member 20 on the ground, there is no water leakage in the water-stop cylinder member 20 as compared with the case where the panels are joined in water as in the conventional water-stop panel construction method. High quality can be achieved. Then, the completed water blocking cylinder member 20 is attached to the final sinking box 10 as shown in FIGS. 1 to 3 (Step S1). In addition, it is preferable to perform the mounting operation of the water blocking cylinder member 20 on land. And, when attaching in the state where the end of the final immersion box 10 is inserted into the water stopping cylinder member 20,
For example, it is preferable to temporarily fix a spacer or the like (not shown) between the inner circumference of the water blocking cylinder member 20 and the outer circumference of the final sinking box 10. In this case, a fixing bracket (not shown) that also serves as a spacer may be used.

Then, the final sink box 10 and the water-stopping cylinder member 2
After completion of 0, the water-stopping cylinder member 20 is attached to the final sinking box 10 and towed to the sinking position to sink (Step S2). In this case, the final settling box 10 is laid down by a basic and well-known method, but as shown in FIG. 1 (A), the gap between the existing box 1 and the existing box 2 is Since the joint end face with the immersion box 10 is slanted, when the final immersion box 10 is inserted between the existing boxes 1 and 2, the final immersion box 10 is arranged from one of the existing boxes 2. It is preferable that the state is set such that the final set-down box 10 is gradually brought closer to the existing box 1 side when sinking.

In this way, even if the space between the existing boxes 1 and 2 is narrow, the final settling box 10 can be reliably laid down between the existing boxes 1 and 2. In addition, as described above, the end face of the final settling box 10 on the side to be finally joined and the existing box 2
Since the end faces of the sides to be finally joined are inclined with respect to each other, the final siding box 10 is easily sunk between the existing boxes 1 and 2 as compared with the case where these end faces are almost perpendicular. And the clearance for submerging the final submerged box 10 between the existing boxes 1 and 2 can be made narrower. As a result, the final settling box 10 and the existing box 2
Can be reduced, and the post-cast concrete portion of the final joint described later does not need to be reinforced by, for example, diaphragm reinforcement, thereby reducing costs.

The existing box 1 and the final settling box 10 are
Joining is performed by well-known hydraulic joining similarly to other embedding boxes (step S3). That is, the final sinking box 10 is drawn to the existing box 1, and an annular gasket (not shown) is abutted between the final sinking box 10 and the existing box 1, and the gasket between the final sinking box 10 and the existing box 1 is used. By draining the enclosed gap to about atmospheric pressure, the final settling box 10 and the existing box 1 are joined by water pressure. In this state, the bulkhead of the existing box 1 on the final settling box 10 side is removed (step S).
4), the bulkhead on the existing box 1 side of the final settling box 10 is removed (step S5).

Then, a cable is connected between the final sinking box 10 and the existing box 1 to build a flexible joint including a gasket, a connecting cable, and the like (step S6). On the other hand, at the same time as these operations, a concrete bottom is cast below the final settling box 10 (Step S7), and when the box concrete has developed a predetermined strength, the sinking box is temporarily supported as is well known. The jack which has been in operation is jacked down (step S8). The steps so far are basically the same as those of ordinary hydraulic joining, except that the end faces of the final settling box 10 and the existing box 2 are slanted.

Next, the final settling box 10 and the existing box 2 are finally connected. In this case, as shown in FIG. 5, first, the water-stopping cylinder member 20 (water-stop collar) attached to the end of the final settling box 10 on the existing box 2 side is moved toward the existing box 2. (Step S9). In this case, the temporary fixation of the final sinking box 10 and the water stoppage cylinder member 20 is released. When the water stop cylinder member 20 is moved, for example, the water transfer can be performed by providing a jack (extrusion jack) for movement in the final sinking box 10 in advance, or by using a wire and a winch (installed in water or on water). It can be a thing,
It is also possible to use a crane barge or the like to operate from above the water by wire. In any case, the water blocking cylinder member 20
Can be easily moved since it has an apparent specific gravity close to 1 as described above and does not have a large surface substantially perpendicular to the moving direction of the bulkhead or the like.

When the water stop cylinder member 20 is moved,
Projection 10 provided on the periphery of the end face of final sinking box 10
a and a protruding portion 2a provided on a peripheral portion of an end face of the existing box 2
It is preferable to arrange a movement guide 31 for guiding the movement of the water-stop cylinder member 20 smoothly. Then, as shown in FIGS. 6 and 7, in a state where the end of the final immersion box 10 is still inserted into the rear end side of the water stop cylinder member 20, the end of the existing box 2 is attached to the front end side of the water stop cylinder member 20. Is inserted, and at the stage where the distal end side of the water stoppage cylinder member 20 contacts the stopper 7,
The movement of the water-stop cylinder member 20 is completed, and in this state, the water-stop cylinder member 20 is fixed to the final sinking box 10 and the existing box 2. At this time, for example, the fixing is performed using a fixing fitting that also serves as a spacer (not shown, for example, one that is fastened by a bolt).

Next, as shown in FIG.
From the inside and the existing box 2 inside, each packer 18,
For example, pressurized water is fed into the inside 18 using a fluid filling pipe 19. As a result, the packer 18 expands, and the space between the outer periphery of the final settling box 10 or the existing box 2 and the inner periphery of the water-stopping cylinder member 20 is closed (step S10).
The left and right portions of the groove 24 on the inner peripheral surface of the water-stop cylinder member 20 and the groove 15 on the outer peripheral surface of the final sedimentary box 10 which are opposed to each other are surrounded by two packers 18, 18. It is surrounded by the inner peripheral surface of 20 and the outer peripheral surface of the final sinking box 10 and is in a state of being isolated from the outside. Similarly, the parts of the groove 25 on the inner peripheral surface of the water blocking cylinder member 20 facing each other and the groove 15 on the outer peripheral surface of the existing box 2 are similarly packed.
The state is shut off from the outside by 8 and 18.

Next, the groove 24 on the inner peripheral surface of the water-stopping cylinder member 20 and the groove 15 on the outer peripheral surface of the final submerged box 10 that have been cut off from the outside, and the groove on the inner peripheral surface of the water-stopping cylinder member 20 As shown in FIG. 8, water-stop material filling pipes 17, 17 are used from inside the final immersion box 10 and the inside of the existing box 2, as shown in FIG. Then, for example, mortar is filled (step S11).
At this time, the water in the portion to be filled with the mortar fills the drainage pipe 27 (the valve provided in the drainage pipe 27 is opened) provided on the upper part of the water-stop cylinder member 20 in response to the filling of the mortar. ) Drained from. Further, when the mortar is almost completely filled, the mortar leaks from the drainage pipe 27, so that it can be confirmed that the mortar has been filled.

When the mortar is filled as described above, the inner peripheral surface of the water-stop cylinder member 20 and the
And the outer circumferential surface of the watertight cylinder member 20 and the outer circumferential surface of the existing box 2 are joined in a state where water is stopped. As a result, the space between the final immersion box 10 and the existing box 2 is shut off from the outside while being surrounded by the water-stopping tube member 20. As described above, the corners of the four corners of the inner peripheral surface of the water-stop cylinder member 20 are arc-shaped, and the corners of the four outer-peripheral surfaces of the existing box 2 and the portion of the final immersion box 10 that are inserted into the water-stop cylinder member 20 are formed. Since the portion is formed in an arc shape, the space between the inner periphery of the water-stop cylinder member 20 and the outer periphery of the existing box 2 and the final settling box 10 does not change significantly at the four corners, and the mortar is filled. At this time, it is possible to improve the water stopping performance at the four corners without causing the mortar to be easily filled at the corners and without significantly changing the manner in which the force is applied.

Next, as shown in FIG. 8, for example, the existing box 2 is provided in advance with an air supply pipe 32 (the existing box) which can communicate with the outside of the bulkhead 14 and supply air to the outside of the bulkhead 14. 2) and a pump (not shown) from the outside of the bulkhead 14 communicating with the outside of the bulkhead 14.
A drain pipe 33 (lower part of the existing box 2) capable of draining water is provided. By draining water from the drain pipe 33 with the valve of the air supply pipe 32 opened, the final settling box 10 and the existing box are drained. 2, that is, the bulkhead 14 of the final settling box 10 and the bulkhead 1 of the existing box 2
Then, water is drained from the space between Step 4 and Step 4 (Step S12).

Then, after the drainage is completed, as shown in FIG. 9, the bulkhead 14 of the final
Is removed (step S13).
Then, a joint construction work between the final immersion box 10 and the existing box 2 is performed by aerial work inside the drained final immersion box 10 and the existing box 2 (step S14). In this case,
As shown in FIG. 10, between the outer shell part of the final settling box 10 and the outer shell part of the existing box 2, the outer peripheral side of the outer shell (the outer skin plate portion of the steel shell at the end) and the outer shell And the connecting steel plate (the outer connecting steel plate 34 and the inner connecting steel plate 3)
5) is arranged, and both ends of the connection steel plate are welded to the final sinking box 10 and the existing box 2 side, respectively. At this time, the outer connecting steel plate 34 is welded first, then the connecting bolt is attached, and then the inner connecting steel plate 35 is welded.
Then, the space between the outer connected steel plate 34 and the inner connected steel plate 35 is filled with internal concrete (post-cast concrete), and the skeleton concrete of the joint portion is internally constructed. As a result, the final sinking box 10 and the existing box 2 are joined by the rigid joint.

According to the connection method of the submerged box as described above,
The main underwater work is the movement of the water-stop cylinder member 20, so that a large amount of diving work is not required unlike the conventional water-stop panel construction method, the work can be performed at a deep water depth, and the connection of the buried box can be performed in a short time. In addition, the connection point of the skeleton in the final connection is only the connection point between the final sinking box 10 and the existing box 2, and the conventional V block method, terminal block method,
Compared with the sliding coupler method, connection of the buried box becomes possible at low cost. In the above example, the present invention is applied to the final connection of the immersion box. However, the present invention may be applied to portions other than the final connection. In this case, it becomes possible to join the buried boxes without using hydraulic joining, and it is also possible to lay the buried boxes in parallel at a position away from the shaft. Although the rigid joint structure is used in the immersion box connection method of the above-described example, for example, if a method of incorporating a bellows joint in the immersion box is also used, a flexible joint can be used. As a result, it is possible to reduce the sectional force generated due to an earthquake, uneven settlement, temperature change, or the like. Furthermore, it is easy to apply the submerged box to a connection other than the final connection.

Further, in the above example, the existing box 1 was replaced with one of the shafts, and one of the shafts and the final settling box 10 were hydraulically joined by a known method, and were connected from the other shaft to the one shaft. If the last sunk box (existing box 2) of the sunk boxes is connected to the final sunk box 10 by the sunk box connecting method of the present invention, the final connection is made at the shaft part with almost the same configuration as the above example. Can be performed. Also,
The structure of the cylindrical connection part of the shaft is changed to the final settlement box 10 of the existing box 2.
It is also possible to connect the tubular connection part of the shaft and the final sunk box 10 by the sunk box connection method of the present invention instead of the existing box 2 instead of the existing box 2. In addition, the structure of the cylindrical connection part of the shaft is the same as the structure of the end of the final immersion box 10 to which the water stop cylinder member 20 is attached,
The water-stopping cylinder member 20 is attached to the tubular connection portion of the shaft in advance, and the final sinking box 10 has the same structure as the existing box 2, and the final sinking box 10 and the shaft are connected by the sinking box connection method of the present invention. It is good.

[0059]

According to the method of connecting a submerged box according to the first aspect of the present invention, the waterstop cylinder member is slid from one submerged box to the other submerged box, and the joint between the submerged boxes is connected to the waterstop cylinder member. The dive work can be performed in a short period of time, since almost no diving work is required since the water can be reliably stopped by covering. Therefore, it is possible to reduce the construction cost and to perform the operation at a deep depth. Further, the water-stop cylinder member is a relatively simple tubular structure, and can be manufactured at low cost, so that the cost can be reduced as a whole.

According to the buried box connection method of the second aspect of the present invention, the cavity provided in the water-stop cylinder member acts as a float, and the specific gravity of the entire water-stop cylinder member can be reduced, so that the water-stop cylinder is provided. When the member is moved from one immersion box to the other, it can be easily moved.

According to the method of connecting a buried box according to the third aspect of the present invention, when the end of each buried box is inserted into the water-stopping cylinder member, the inner peripheral surface of the water-stopping cylinder member and the outer peripheral surface of the buried box are connected. The provided space has no corners, and for example, when filling this portion with a water-stopping material such as a water-stopping mortar, it is possible to prevent an insufficiently filled state at the corners. . Therefore, with such a configuration, the water stopping performance of the water stopping cylinder member can be improved.

According to the method of connecting a buried box according to the fourth aspect of the present invention, when a buried box to be laid later is laid between the two existing boxes, the upper part of the gap between the two existing boxes is widened. At the same time, since the lower part of the sinking box becomes narrower, the sinking box can be easily placed between the two existing boxes. Therefore, it is possible to make the clearance for the sunk box of the two existing boxes narrower, and when joining the existing box and the sunk box, the distance between the existing box and the sunk box can be further reduced. Therefore, the joint between the existing box and the sinking box is shortened to have higher strength, and the necessary reinforcement for the joint part is reduced.
Further, the cost can be reduced.

According to the method of connecting a submerged box according to claim 5 of the present invention, the present invention can be applied even when a final connection is made between a submerged box and a connection part of a submerged box of a shaft. Also, the effects described in any of claims 1 to 4 can be achieved.

[Brief description of the drawings]

FIG. 1 is a drawing for explaining construction of a submerged tunnel to which a submerged box connection method according to an embodiment of the present invention is applied.

FIG. 2 is a view showing a part of an existing box, a final sunk box, and a water-stop cylinder member used in the buried box connection method of the above example.

FIG. 3 shows an existing box used in the submerged box connection method of the above example,
It is sectional drawing for demonstrating the principal part of a final immersion box and a water stoppage cylinder member, and explaining the process of a buried box connection method.

FIG. 4 is a flowchart for explaining the method of connecting a buried box in the above example.

FIG. 5 is a drawing for explaining the steps of the method for connecting a buried box in the above example.

FIG. 6 is a drawing for explaining steps of the method for connecting a buried box in the above example.

FIG. 7 is a drawing for explaining the steps of the method for connecting a buried box of the above example.

FIG. 8 is a drawing for explaining the steps of the method for connecting a buried box in the above example.

FIG. 9 is a drawing for explaining the steps of the method for connecting a buried box of the above example.

FIG. 10 is a drawing for explaining the steps of the method for connecting a buried box in the above example.

[Explanation of symbols]

 2 Existing box (the other buried box) 10 Final buried box (the one buried box) 20 Water stop cylinder member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuo Yoshida 4-1-1, Komyobashi, Chuo-ku, Osaka-shi, Osaka Toyo Construction Co., Ltd. (72) Inventor Ryosuke Horii 5 Tobancho, Chiyoda-ku, Tokyo Toa Construction Industry (72) Inventor Kazuhiro Yamamura 5 Yonbancho, Chiyoda-ku, Tokyo Toa Construction Industry Co., Ltd. F-term (reference) 2D055 EA02

Claims (5)

[Claims] 1. A cylindrical water-stop cylinder substantially along the outer periphery of said submerged box and open at both ends before submerging said submerged box into one of two submerged boxes to be joined to each other in advance. A watertight cylinder member mounting step of mounting the member in a state where the joining end of one of the buried boxes is inserted into the watertight cylinder member; and, in a state where the two buried boxes are opposed to each other in water at an interval, By moving the water-stopping cylinder member from the immersion box to the other immersion box, the joining end of one of the immersion boxes is inserted into the rear end side of the water-stopping cylinder member, and the other end is inserted into the front end side of the water-stopping cylinder member. A water-stop cylinder member moving step in which the joint end of the immersion box is inserted, and then, while keeping the inner peripheral surface of the water-stop cylinder member and the outer peripheral surface of one of the immersion boxes water-stopped, Water was stopped between the inner peripheral surface of the water-stop cylinder member and the outer peripheral surface of the other submerged box. By shutting off the space surrounded by the water-stop cylinder member between the submerged boxes and the outside, a draining step of discharging water from the space, and then draining the water-stop cylinder member And a joining step of joining the buried boxes inside each other. 2. The buried box connecting method according to claim 1, wherein a cavity for adjusting an apparent specific gravity of the whole water-stop cylinder member is formed in the water-stop cylinder member. Connection method. 3. The method of connecting a submerged box according to claim 1 or 2, wherein the submerged box and the water-stop cylinder member have a rectangular cross section, and at least the submerged box and the inner peripheral surface of the water-stop cylinder member are connected to each other. In a portion arranged in an overlapping state and a portion arranged in an overlapping state with at least the water-stop cylinder member on the outer peripheral surface of the immersed box, the corners of the four corners are formed in a state in which they are rounded in a substantially arc shape. A method of connecting a buried box. 4. The method of connecting a submerged box according to claim 1, 2 or 3, wherein the joint end surface of the submerged one of the two submerged boxes is a slope that recedes upward as it goes upward, A method of connecting a buried box, characterized in that the junction end face of the buried box that is sunk from the back of the box is a slope that recedes downward. 5. The method of connecting a buried box according to claim 1, wherein one of the two buried boxes to be connected is:
A method of connecting a buried box, wherein a cylindrical connection part provided in a shaft is replaced.