JP3443789B2 - Bearing base of sliding bearing for underwater tunnel and method of constructing it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to construction of a water bottom tunnel by box extrusion.

[0002]

2. Description of the Related Art As a conventional extrusion water bottom tunnel method,
There is Japanese Examined Japanese Patent Publication No. 60-1478. In this construction 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 an opposite bank 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]

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

[0005]

Means for Solving the Problems The present invention includes a lower structure arranged on the support of the sliding bearing of the undersea tunnel, an upper cover for covering the lower <br/> unit structure, given the upper lid Solid at the height of
And height fixture to constant, characterized in that it comprises a filled solidified in a space partitioned by the upper lid and the lower structure, to provide a bearing bracket of the sliding bearings of the undersea tunnel.

[0006] Also, on the support of the sliding bearing of the subsea tunnel
The lower structure, and cover the lower structure with an upper lid.
Leveling with the upper lid raised and placed above
Position it at the tip of the material to determine the height, and
Fix the part cover with a height fixing jig, and
Constructed by filling the space partitioned by the cover with solidifying material
Of a slide stand for a subsea tunnel, characterized by
Provide a way .

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of constructing a subsea tunnel of the present invention will be described below with reference to the drawings.

<A> Construction of water blocking wall First, a groove for installing a group of boxes is excavated at the bottom of the water area 100. After placing the retaining steel sheet pile along the edge of the excavation plan line of the groove on the land, as shown in FIG.
A double deadline 102 is constructed near the shore side of. And
The inner side of the Soil retaining sheet pile is excavated, and as shown in FIG. 7, the groove 103 is excavated from the start side coastal portion to the double deadline 102.

The shape of the groove 103 is excavated so as to correspond to the design shape of the subsea tunnel. In the present embodiment, FIG.
In order to describe the case of constructing a concave arcuate tunnel as shown in FIG. 3, the groove 103 is also excavated in a concave arcuate shape correspondingly.

Next, as shown in FIG. 7, a water blocking wall 200 is constructed at a position where water is flooded for a predetermined distance from the start side coastal portion. The construction position of the water blocking wall 200 may be constructed at a water depth where the entire box body can be submerged. The shape of the water blocking wall 200 is, for example, as shown in FIG. 1, provided with an opening for passage of a group of boxes in an excavated groove 103 to form a gate shape, and the size of the opening has a box cross section. Design slightly larger than the external shape.

A water blocking member, such as a wire brush, which comes into contact with the peripheral surface of the box body is provided on the inner surface of the opening. It should be noted that the shape of the water blocking wall 200 may be such that only column members are erected on both sides of the box when the water depth at the construction position is shallower than the water depth in which the entire box is submerged.

<B> Construction of Extruded Yard / Manufactured Yard As shown in FIGS. 1 and 2, from the water blocking wall 200 to the land portion, an extruded yaw 300 and a production yad 310 are sequentially provided. It is provided that both of these yard 300 and 310 are formed on the extension of the concave arc of the groove 103. In addition, production word 3
A temporary storage space 320 for materials and the like is provided on the flat surface portion of the land portion 10 side. And on those slopes, water casters
A friction reducing device 210 such as the above is installed. In addition, the extruder
In the vicinity of the boundary between the door 300 and the manufacturing yard 310, a braking reaction force receiving wall 220 of a gate type as shown in FIGS.
Or build a beam.

Conventionally, the extrusion yard 300 and the fabrication yard were used.
Although the door 310 is provided in the land area along the coast of the water area, as in the present invention, the water level is lowered by installing the water blocking wall 200, and these yams are installed in the water area, so that The extrusion distance can be shortened.

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

<D> Manufacture of Box / Pre-extrusion The manufacturing box 310 manufactures a box 400 having a reinforced concrete structure and a composite structure of a steel shell in a dry state. The box 400 is made by constructing one block on the production yard 310 in a flow-wise manner for each block portion, and successively staking concrete to construct a predetermined number of block groups continuously and integrally. For example, 10 blocks are integrally manufactured in units of 100 m, prestress is introduced, and 10 blocks are connected with a joint or the like.

As an example of a concrete manufacturing method of the box 400, as shown in FIGS. 1 and 2, for example, assembling and welding the bottom plate steel plate 401, assembling the bottom plate rebar 402, placing concrete on the bottom plate 403, and side wall rebar 404. Assembly, side wall 405
Of concrete, the assembling of the upper deck slab 406, the concrete placing of the upper deck 407, the attachment of the waterproof sheet 408, and the placing of the protective concrete 409.

A box 400 manufactured in sequence as described above.
Until the original extrusion device 250 is installed, extrusion is performed by the temporary extrusion device. For example, the water blocking wall 20
The bottom slab 403 is pulled by a PC steel wire using a center hole jack installed at the bottom of 0, 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 the box When the tip of the box 400 passes through the braking reaction force receiving wall 220, the original extrusion device 250 is installed. As a specific example, as shown in FIGS. 1 and 7, a leading end device such as a hand-held girder 410 is attached to the leading end 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. .

As a concrete example of the extrusion device 250, FIG.
As shown in FIG. 5, a pair of center-wheel jacks 251 and 252 capable of gripping and releasing the PC steel strand 240 are used. These are installed by fixing the moving pedestal 253 to a recess provided in the upper floor slab 407 of the box 400.

After the box 400 penetrates through the braking reaction force receiving wall 220, the box 400 is pushed by the pushing device 250.
The initial extrusion work is performed until the tip of the penetrating the water blocking wall 200. As shown in FIGS. 3 to 5, the operation of the center-wheel jacks 251 and 252 is performed by alternately repeating gripping and releasing the wedges at both ends of the jack, while at the same time extending one of the jacks and contracting the other of the jacks. The box 400 is extruded by moving 253. 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 revetment 101 is removed, the groove 103 is extended, and the slide bearing 230 is installed in the same manner as described above. Do by the way. Next, the double deadline 102 is removed and water is poured. At this time, water does not enter the extruding yard 300 and the manufacturing yard 310 due to the water blocking wall 200.

Next, the water blocking wall 20 is placed in the extrusion yard 300.
Inject water at a water level lower than the outer water area of 0, and
By reducing the water pressure acting on the front surface, the force necessary for pushing out the group of boxes 400 is reduced and the group of boxes 400 is set so as not to be pushed back to the pushing-out yard 300 side. That is, the gradient of the manufacturing word 300 and the moving box 4
Due to the coefficient of friction with the sliding bearing 230 that supports the weight of group 00, the group of boxes 400 is in a stopped state even if the water pressure from the outer water region acts.

<G> Extrusion of box body As described above, the box body 400 is repeatedly manufactured and extruded to extrude a group of box bodies 400 along the concave arc. And
As shown in FIG. 9, the tail end of the group of boxes 400 is the water stop wall 20.
Extrude until reaching 0, and complete the extrusion process.
Then, as shown in FIG. 10, the pushing device 250 and the braking reaction force receiving wall 220 are removed. When the starting end of the water bottom tunnel is different from the extrusion completion position, the front end of the group of boxes 400 is pulled in from the opposite bank side of the water area as necessary and joined to the onshore tunnel or the like on the opposite bank. The tail end of the group of boxes 400 moves to the starting point position of the extrusion tunnel.

Next, the seawall 104 is restored and the backfill 105 is performed.
After draining the soil, the facilities such as the water blocking 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 left as a support for the tunnel without being removed. This completes the extrusion construction of the subsea tunnel.

The sliding bearing of the present invention will be described below.

<A> Sliding Bearing (Fundamental Structure of Underwater Tunnel) The sliding bearings 230 are installed along the bottom surface of the groove 103 at predetermined intervals, as shown in FIG. The sliding bearing 230 serves as the basic structure of the subsea tunnel, and details are shown in FIGS.
As shown in, the preceding foundation pile 233 and the following foundation pile 2
The support body 231 is supported by 34, and the support base 232 is arranged on the support body 231. Leading foundation pile 23
3 and the trailing foundation pile 234 may be those capable of supporting the foundation structure of the water bottom tunnel, for example, a steel pipe pile is used and a rib is provided on the outer surface of the head. The support body 231 may have a support base 232 on the upper part and can support a water bottom tunnel. For example, the support body 231 has a steel shell structure, and the preceding foundation pile hole 23.
3 and trailing foundation pile holes 234. Leading foundation pile hole 2
33 is formed by, for example, an outer insertion tube 501, a temporary receiving cross beam 502 is provided on the upper portion, and a rubber packing 503 is provided on the lower portion. The trailing foundation pile hole is formed by, for example, the outer insertion tube 501, and the rubber packing 503 is provided in the lower portion. The rubber packing 503 prevents the concrete from leaking when the concrete is placed between the support 231 and the foundation piles 233 and 234.

<B> Construction of Sliding Bearing (Fundamental Structure of Underwater Tunnel) In the method of constructing the sliding bearing 230 in water, for example, the preceding foundation pile 233 is first driven. For that purpose, mooring the pile driver, adjusting the position, suspending the preceding foundation pile 233,
Position using the MN reader (expandable guide). The preceding foundation stake 233 is built, is driven to the bottom of the water with a vibro hammer, and a hydraulic hammer with a yatco is attached to the preceding foundation stake 233 to perform underwater driving. When a predetermined number, for example, four of the preceding foundation piles 233 are driven in, the mooring of the pile driving ship is released. Next, in order to install the supporting body 231, the hoisting ship is guided by the GPS and moored, and the supporting body 231 is moved to the GP.
The position is guided by S, and the support body 231 is suspended through a suspension frame, and the support body 231 is suspended to about 2 m above the planned height. The MN leader holds the standard pillar of the suspension frame, and the foundation foundation piles for leading 2
Precisely install 33 so that it enters the preceding foundation pile hole 235 of the support 231. After installation, disconnect the hanging frame with a quick release joint. In this way, the preceding foundation pile 23
By inserting 3 into the preceding foundation pile hole 235 of the support, the preceding foundation pile 233 also has the 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 body 231 is inserted into the trailing foundation pile hole 236. , Is placed on the bottom of the water with a vibro hammer, and a hydraulic hammer with a yatco is attached to the trailing foundation pile 234 for underwater placement. When a predetermined number of trailing foundation piles 234 are driven, for example, 12 piles, the mooring of the pile driving ship is released. Furthermore, concrete is poured into the steel shell of the support to construct a sliding bearing.

<C> Sliding Bearing Support Base The support base 232, as shown in FIGS. 15 to 19, is formed on the support 231 and supports the box 400 of the subsea tunnel. A sliding plate 603 having an iron plate or the like is arranged on the upper part of the support base 232, and the box 400 of the subsea tunnel is installed.
Make it slippery. The support base 232 has a lower structure 601.
The upper lid 602 and the 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 the solidifying material. The upper lid 602 is the lower container 60.
4 has a structure like a lunch box integrally with the lower container 604.
Has a side portion that slides adjacent to the outer periphery of the side surface. As shown in FIG. 17, the support base 232 is formed by first lowering the lower container 604.
An upper lid 60 is attached to a lower structure 601 in which a solidifying material is filled.
2 is covered. A sliding plate 603 is attached to the upper lid 602. Leveling material 607 is provided above the support base 232.
, And the height of the support base 232 is positioned. 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 a hanging chain 608 or the like to be positioned at the tip of the leveling member 607. The position of the upper lid 602 is fixed by the height fixing jig 606. Next, as shown in FIG. 19, the lower structure 6
The space partitioned by 01 and the upper lid 602 is filled with the solidifying material 605 to construct the support base 232 having a predetermined height. With this construction, the predetermined height of the support base 232 can be easily determined.

In the above description, the case of constructing a concave arcuate tunnel having a height difference has been described, but the case of constructing a tunnel on the same horizontal plane is also conceivable. In these cases, when it is necessary to construct the bottoms of the box-manufacturing yard 310 and the extrusion yard 300 on a horizontal plane, water-extruding walls are provided at both front and rear ends of the extrusion yard 300 for extrusion. As an example, it may be considered that the water level in the yard can be adjusted.

[0030]

As described above, the submarine tunnel support of the present invention produces the following effects. <B> You can easily adjust the height of the pedestal.

[Brief description of drawings]

[Figure 1] Illustration of the entire extrusion construction of the submarine tunnel

[Fig. 2] An explanatory view of an extrusion yard and a production yard.

FIG. 3 is an explanatory view of an extruder.

FIG. 4 is an explanatory view of an extruder.

FIG. 5 is an explanatory view of an extruder.

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 diagram 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.

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

[Fig. 13] Layout plan of preceding foundation piles

[Fig. 14] Layout plan of trailing foundation piles

FIG. 15 is a perspective view of the support base.

FIG. 16 is a sectional view of the support base.

FIG. 17 is an explanatory diagram of construction of a support stand.

FIG. 18 is an explanatory diagram of construction of a support stand.

[Fig. 19] An explanatory diagram of construction of a support stand

FIG. 20 is an explanatory diagram of conventional technology.

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Satoru Nagase 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (56) References Japanese Patent Publication Sho 60-1478 (JP, B2) 48-22088 (JP, Y1) S. 48-22087 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 29/063-29/077

Claims (2)

(57) [Claims] A lower structure arranged in claim 1] on the support of the sliding bearings of the undersea tunnel, an upper lid covering the lower structure, the height fixing jig for fixing the upper lid at a predetermined height, characterized in that it comprises a solidified product which is filled in a space partitioned by the upper lid and the lower structure, bearing blocks of sliding bearings of undersea tunnel. 2. A lower part on a support of a sliding bearing of a subsea tunnel.
A structure is placed, the lower structure is covered with an upper lid, and the upper lid is hung up and arranged above.
Position it at the tip to position the height, and use this height to
Is fixed by a height fixing jig, and a solidifying material is placed in the space partitioned by the lower structure and the upper lid.
A method of constructing a support base for a sliding support of a subsea tunnel , which is characterized by filling and constructing.