JPH11336105A - Support bed for slide support of underwater tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply adjust height by providing a lower structure arranged on the base of a slide support, an upper cover covering it, and a solidified object filled in the space partitioned by the lower structure and the upper cover. SOLUTION: A support bed 232 is formed on a base 231 to support the caisson of an underwater tunnel. A lower structure 601 filled with a solidified object in a lower container 604 is covered with an upper cover 602. A slide board 603 is fitted to the upper cover 602 to make the caisson easily slidable. Leveling materials 607 are arranged on the support bed 232 to position the height of the support bed 232. The upper cover 602 is located at the tips of the leveling materials 607 and is fixed by height fixing jigs 606. The solidified object is filled in the space partitioned by the lower structure 601 and upper cover 602, and the support bed 232 is formed at the prescribed height. The height of the support bed 232 can be simply adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to construction of an underwater tunnel by extruding a box.

[0002]

2. Description of the Related Art As a conventional extruded underwater tunnel construction method,
There is Japanese Patent Publication No. 60-1478. In this method, as shown in FIG. 20, a box b manufactured in a dry state by a manufacturing yard a is sequentially extruded on a slide bearing c to reach the opposite shore of a water channel d to complete a water bottom tunnel. It is a construction method.

However, the height of the sliding bearing c cannot be arbitrarily specified.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slide bearing support whose height can be easily adjusted.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a lower structure disposed on a support for a sliding bearing of an underwater tunnel, an upper cover covering the lower structure, and a space partitioned by the lower structure and the upper cover. A bearing for a sliding bearing of an underwater tunnel, characterized in that it comprises a filled solid.

Further, in the bearing base of the sliding bearing of the underwater tunnel, the lower structure includes a lower container having an upper opening, and a solid material filled in the lower container, and the upper lid has a side surface of the lower container. A sliding base for a submersible tunnel, characterized in that it has a sliding side adjacent to the outer circumference of the underwater tunnel.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of construction of a submarine tunnel according to the present invention will be described with reference to the drawings.

<A> Construction of water stop wall First, a trench for installing a group of boxes is excavated at the bottom of the water area 100. After placing the earth retaining sheet pile along the edge of the excavation planning line in the land-based trench, as shown in FIG.
A double deadline 102 is constructed near the shore side of. And
The inside of the earth retaining steel sheet pile is excavated, and a groove 103 is excavated from the starting coastal area to the double deadline 102 as shown in FIG.

The shape of the trench 103 is excavated in accordance with the design shape of the underwater tunnel.
In order to explain the case of constructing a concave arc-shaped tunnel as shown in FIG. 1, the groove 103 is also excavated in a concave arc shape corresponding to the tunnel.

Next, as shown in FIG. 7, a water stop wall 200 is constructed at a position where the water is flooded by a predetermined distance from the starting shore. The construction position of the water stop wall 200 may be constructed at a depth where the entire housing can be submerged. For example, as shown in FIG. 1, the water stop wall 200 is formed in a gate shape by providing an opening for passing a group of boxes in the excavated groove 103, and the size of the opening is a cross section of the box. Design slightly larger than the external shape.

A water-stopping member, such as a wire brush, is provided on the inner surface of the opening to contact the peripheral surface of the box. When the water depth at the construction position is shallower than the water depth at which the entire case is immersed, the water stop wall 200 may simply be provided with column members on both sides of the case.

<B> Construction of Extruding Yard and Manufacturing Yard As shown in FIGS. 1 and 2, from the water blocking wall 200 to the land, the extruding yard 300 and the manufacturing yard 310 are sequentially arranged. The two yards 300, 310 are provided so as to be on the extension of the concave arc of the groove 103. Also, production yard 3
A temporary storage space 320 for materials and the like is provided on a flat surface portion on the land side of 10. And on those slopes, there are water casters.
And the like. In addition, extrusion yarn
In the vicinity of the boundary between the arm 300 and the manufacturing yard 310, a gate-type or other braking reaction force receiving wall 220 as shown in FIGS.
Or build beams.

Conventionally, extrusion jar 300 and fabrication jar
The yard 310 is provided on the land along the coast of the water body. However, as in the present invention, the water level is lowered by installing the water stop wall 200, and these yards are provided in the body of water to form a box group. The extrusion distance can be shortened.

<C> Installation of Sliding Bearing As shown in FIGS. 1 and 7, sliding bearings 230 are installed at predetermined intervals along the bottom surface of the groove 103. As an example of the slide bearing 230, a steel-frame concrete base is supported by a steel pipe pile, and an iron plate or the like is attached to the surface of the base. Details of the sliding bearing 230 of the present invention will be described later.

<D> Manufacture and pre-extrusion of box At a manufacturing yard 310, a box 400 having a reinforced concrete structure and a composite structure of a steel shell system is manufactured in a dry state. In the box 400, one block is manufactured on a manufacturing yard 310 in a block-by-block manner, and concrete is sequentially joined to form a predetermined number of block groups continuously and integrally. For example, they are integrally manufactured in units of 100 blocks of 10 blocks, pre-stress is introduced, and the connection between the blocks of 10 blocks is made by a joint or the like.

1 and 2, for example, assembling and welding a bottom plate steel plate 401, assembling a bottom plate reinforcing bar 402, placing a bottom plate 403 in concrete, and side wall reinforcing bars 404, as shown in FIGS. Assembly of the side wall 405
, Concrete assembling of the upper floor slab 406, concrete laying of the upper floor slab 407, attaching of the waterproof sheet 408, and placing of the protective concrete 409.

A box 400 sequentially manufactured as described above
Until the original extrusion device 250 is installed, extrusion is performed by a temporary extrusion device. For example, the water blocking wall 20
Using a center-hole jack installed at the lower part of the box 0, the bottom plate 403 is pulled with a strand of PC steel, and pre-extrusion work is performed until the tip of the box 400 penetrates the braking reaction force receiving wall 220.

<E> Initial Extrusion of Box When the tip of the box 400 has passed through the braking reaction force receiving wall 220, the original extruder 250 is installed. As a specific example, as shown in FIGS. 1 and 7, a tip device such as a hand girder 410 is attached to the tip bulkhead. Next, as shown in FIGS. 1 and 2, a predetermined number of PC steel wires 240 are stretched between the water blocking wall 200 and the braking reaction force receiving wall 220, and the extrusion device 250 is mounted on the way. .

FIG. 3 shows a specific example of the extrusion device 250.
As shown in FIG. 5, a pair of center ball jacks 251 and 252 capable of holding and releasing the PC steel strand 240 are used. These are installed by fixing the movable gantry 253 to a recess provided in the upper floor slab 407 of the box 400.

After the box 400 has penetrated the braking reaction force receiving wall 220, the box 400 is
The initial extruding operation is performed until the tip of the pierce through the water stop wall 200. As shown in FIGS. 3 to 5, the center ball jacks 251 and 252 operate while moving one of the jacks at the same time as the other while contracting and releasing the wedges at both ends of the jacks alternately. 253 is moved to extrude the box 400. When the pushing device 250 approaches the water blocking wall 200, the pushing device 250 is replaced on the reaction force receiving wall 220 side, and the above operation is repeated.

<F> After the water injection box 400 penetrates the water blocking wall 200, as shown in FIG. 8, the seawall 101 is removed, the groove 103 is extended, and the sliding bearing 230 is installed in the same manner as described above. Do it by the way. Next, the double deadline 102 is removed and water is injected. At this time, water does not enter into the extrusion yard 300 and the manufacturing yard 310 due to the water blocking wall 200.

Next, the water blocking wall 20 is inserted into the extrusion jar 300.
Water is injected at a water level lower than the water area outside
By reducing the water pressure acting on the front surface, the force required for pushing out the box 400 group is reduced, and the box group 400 is set so as not to be pushed back to the extrusion yard 300 side. That is, the inclination of the manufacturing yard 300 and the moving box 4
Due to the coefficient of friction with the sliding bearing 230 supporting the weight of the group 00, the group of boxes 400 is stopped even when the water pressure from the outside water area acts.

<G> Box Extrusion Work The production and extrusion of the box 400 are repeated as described above, and the group of boxes 400 is extruded along a concave arc. And
As shown in FIG. 9, the tail end of the group of boxes 400
Extrude until reaching just before zero, and complete the extruder.
After that, as shown in FIG. 10, the pushing device 250 and the braking reaction force receiving wall 220 are removed. If the starting point of the underwater tunnel is different from the extrusion completion position, the tip of the group of boxes 400 is pulled in from the opposite side of the water area as necessary, and joined to a land tunnel or the like on the opposite side. The tail end of the group of boxes 400 moves to the starting point of the extrusion tunnel.

Next, the revetment 104 is restored and the backfill 105
After draining the inside of the earth retaining part, facilities such as the water stop wall 200, the friction reducing device 210, and the sliding bearing 230 on the land side from the starting point of the extrusion tunnel are removed. The sliding bearing 230 installed at the bottom of the extrusion tunnel is not removed and is left as a support for the tunnel. This completes the underwater tunnel extrusion work.

Hereinafter, the sliding bearing according to the present invention will be described.

<A> Sliding Bearing (Basic Structure of Underwater Tunnel) The sliding bearings 230 are installed at predetermined intervals along the bottom surface of the groove 103 as shown in FIG. The sliding bearing 230 is the basic structure of the underwater tunnel, and is described in detail in FIGS.
As shown in the figure, the leading foundation pile 233 and the trailing foundation pile 2
The support 231 is supported by 34, and the support 232 is arranged on the support 231. Preceding foundation pile 23
The base pile 3 and the trailing foundation pile 234 may be any as long as they can support the foundation structure of the underwater tunnel. For example, a steel pipe pile is used, and a rib is provided on the outer surface of the head. The support 231 may be provided with a support base 232 at an upper portion and capable of supporting an underwater tunnel. For example, the support 231 may have a steel shell structure,
3 and a trailing foundation pile hole 234. Preceding foundation pile hole 2
33 is formed of, for example, an extracorporeal tube 501, a temporary receiving cross beam 502 is provided at an upper portion, and a rubber packing 503 is provided at a lower portion. The trailing foundation pile hole is formed by, for example, an outer tube 501, and a rubber packing 503 is provided at a lower portion. The rubber packing 503 prevents the concrete from leaking when the concrete is poured between the support 231 and the foundation piles 233, 234.

<B> Construction of Sliding Bearing (Basic Structure of Underwater Tunnel) In a method of constructing the sliding bearing 230 in water, for example, first, the preliminary foundation pile 233 is driven. For that purpose, mooring a piled-in boat, adjusting the position, suspending the preliminary foundation pile 233,
Positioning is performed using an MN reader (extendable guide). The precedent foundation pile 233 is erected, driven into the water bottom with a vibratory hammer, and a hydraulic hammer with a yatco is attached to the precedent foundation pile 233 to perform submerged driving. When a predetermined number, for example, four, of the preceding foundation piles 233 is driven, the mooring of the pile driving boat is released. Next, in order to install the support 231, the crane ship is guided by the GPS to moor it, and the support 231 is
The position is guided by S, suspended through the suspension frame, and the support 231 is suspended down to about 2 m above the planned height. The reference pillar of the suspension frame is held by the MN leader,
It is set accurately so that 33 enters the precedent foundation pile hole 235 of the support 231. After installation, detach the suspension frame with the quick release joint. Thus, the precedent foundation pile 23
By inserting 3 into the precedent foundation pile hole 235 of the support, the precedent foundation pile 233 also has a function of positioning the support. Next, in order to drive the trailing foundation pile 234, the pile driving ship is moored, the position is adjusted, the trailing foundation pile 234 is suspended, and the support 231 is put into the trailing foundation pile hole 236. Then, a hydraulic hammer with a Yatco is attached to the following foundation pile 234 with a vibratory hammer, and the underwater casting is performed. When a predetermined number, for example, 12, of the trailing foundation piles 234 are driven, the mooring of the piled-in boat is released. In addition, concrete is cast into the steel shell of the support to build a sliding bearing.

<C> Bearing Table for Sliding Bearing The bearing table 232 is formed on a support 231 as shown in FIGS. 15 to 19, and supports the box 400 of the underwater tunnel. A sliding plate 603 having an iron plate or the like is arranged above the support 232,
Make it slippery. The support base 232 includes a lower structure 601.
, An upper lid 602, and a space partitioned by these are filled with a solidifying material 605 such as non-shrink mortar. Lower structure 60
1 is obtained, for example, by filling the lower container 604 on the support 231 with a solidifying material. The upper lid 602 is connected to the lower container 60
4 and a lower box 604
Has a side portion that slides adjacent to the outer periphery of the side surface of. As shown in FIG. 17, first, the support 232 is
The upper lid 60 is attached to the lower structure 601 in which the solidification material is filled.
2 is covered. A sliding plate 603 is attached to the upper lid 602. A leveling material 607 is provided above the support 232.
Is positioned, and the height of the support base 232 is determined. A height fixing jig 606 such as a fixing screw is attached to the upper lid 602. Next, as shown in FIG. 18, the upper lid 602 is lifted by the hanging chain 608 or the like, and is positioned at the tip of the leveling member 607. The position of the upper lid 602 is fixed with a height fixing jig 606. Next, as shown in FIG.
The solidification material 605 is filled in a space defined by the upper cover 602 and the upper cover 602 to construct a support 232 having a predetermined height. With this construction, the predetermined height of the support base 232 can be easily determined.

Although the above description has been made of the case where a concave arc-shaped tunnel having a height difference is constructed, the case where the tunnel is constructed on the same horizontal plane is also conceivable. In these cases, when it is necessary to construct the bottom surface of the box production jar 310 and the extrusion yard 300 on a horizontal plane, water is provided at both front and rear ends of the extrusion jar 300 to perform extrusion. As an example, it can be considered that the water level in the yard can be adjusted.

[0030]

As described above, the support of the underwater tunnel according to the present invention has the following effects. <B> The height of the support base can be easily adjusted.

[Brief description of the drawings]

Fig. 1 Explanatory drawing of the entire excavation work of a submarine tunnel

FIG. 2 is an explanatory view of an extrusion yard and a manufacturing yard.

FIG. 3 is an explanatory view of an extrusion device.

FIG. 4 is an explanatory view of an extrusion device.

FIG. 5 is an explanatory view of an extrusion device.

FIG. 6 is an explanatory diagram of an extrusion process.

FIG. 7 is an explanatory diagram of an extrusion process.

FIG. 8 is an explanatory diagram of an extrusion process.

FIG. 9 is an explanatory view of an extrusion process.

FIG. 10 is an explanatory diagram of an extrusion process.

FIG. 11 is a top view of a sliding bearing support.

FIG. 12 is a sectional view taken along the line XII-XII of FIG. 11;

FIG. 13 Layout diagram of precedent foundation pile

FIG. 14 Layout plan of the post foundation pile

FIG. 15 is a perspective view of a bearing base.

FIG. 16 is a sectional view of a bearing base.

FIG. 17 is an explanatory view of the construction of a bearing base.

FIG. 18 is an explanatory view of the construction of a support base.

FIG. 19 is an explanatory view of the construction of a bearing base.

FIG. 20 is an explanatory view of a conventional technique.

Continued on the front page (72) Inventor Satoru Nagase 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (2)

[Claims] 1. A lower structure disposed on a support for a sliding bearing of an underwater tunnel, an upper lid covering the lower structure, and a solidified material filled in a space partitioned by the lower structure and the upper lid. A bearing base for sliding bearings in underwater tunnels. 2. The bearing of claim 1, wherein the lower structure comprises a lower container having an upper opening, and a solidified material filled in the lower container. A bearing for a sliding bearing of a submerged tunnel, characterized in that it has a sliding side adjacent to the outer periphery of the side of the lower container.