JPH086157Y2 - Recessed hole blocking device for bolt connection of concrete segment for tunnel - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] This invention, in tunnel construction, forms a primary lining layer by sequentially connecting a number of arc-shaped concrete segments in an annular shape from the end to the inner surface of the excavation hole excavated in the ground. Prevents the waterproof sheet from falling into the bolt connection recessed holes of the segment due to the pressure of concrete when the waterproof sheet is pasted on the inner surface and the secondary lining layer is placed inside it. Therefore, the present invention relates to a device for closing the opening surface of the recessed hole.

[0002]

2. Description of the Related Art A segment type tunnel is generally constructed as shown in FIG. 3 and FIG.
In order from the end, a large number of plate-shaped concrete segments (2) that are manufactured in advance and curved in an arc shape are connected in an annular shape with bolts (not shown) to form a cylindrical primary lining layer (3). However, a water blocking sheet (S) is attached to the inner surface to prevent the seepage of spring water from the ground, and the inner surface and the cylindrical formwork (not shown) built inside It is constructed by forming a secondary lining layer (4) by placing concrete between them.

Each segment forming the primary lining layer (3)
The connection of (2) is made by inserting a concave hole in the end of each segment (2) in advance.
(5) and bolt hole (6) that connects the recessed hole (5) and the outer surface
Is formed and fastened by bolts (not shown) inserted through both bolt holes (6) of the adjacent segments (2).

However, in the above state, the secondary lining layer is provided inside the water blocking sheet (S) attached to the inner surface of the primary lining layer (3).
When the concrete for forming (4) is cast, the water blocking sheet (S) drops into the recessed hole (5),
(S) may be damaged or the water-stopping effect may not be obtained.

When the secondary lining concrete is directly placed on the inner surface of the segment (2) without providing the water blocking sheet (S), the concrete flows into the recessed hole (5), When the concrete hardens, a tensile stress may be generated in the secondary lining layer (4) to cause cracks.

As a means for solving this problem, there is, for example, one shown in FIG. In the figure, (7) is a closing plate slightly larger than the opening surface of the recessed hole (5), and its back surface (upper surface in FIG. 5) is a flat rectangular frame slightly smaller than the opening surface.
(8) are continuously provided, and a mounting groove (9) having a dovetail-shaped cross section is formed on the outer peripheral surface thereof in a direction parallel to the closing plate (7).

The back surface of the flexible retaining band (10) is fitted in the mounting groove (9), and the front surface of the retaining band (10) is inclined toward the edge of the closing plate (7). , The side surface (5a) of the recessed hole (5) and the retaining band (1
A plurality of locking pieces (11) slightly wider than the interval (0) are provided in a protruding manner.

The above-mentioned closing plate (7) has a rectangular frame (8) with a concave insertion hole.
If pushed into (5), each flexible locking piece (11) will have a recessed hole (5).
Since the side surface (5a) is elastically pressure contacted, each locking piece (11) is inclined as described above, and the side surface (5a) is rough and has some irregularities, the closing plate (7) has a concave hole ( It fits in 5) so that it cannot be removed.

Then, the water blocking sheet (S) is stretched by being locked on the surface of each closing plate (7) or at an appropriate position of the first lining layer (3),
If the concrete for the second lining layer (4) is cast, there is no risk that the water blocking sheet (S) will fall into the recessed hole (5) and that the concrete will flow into the recessed hole.

[0010]

However, the shape and size of the recessed hole (5) differ depending on where the bolts are connected even in the same segment (2), and naturally differ if the scale of the tunnel is different. The closing device shown in FIG. 3 needs to be prepared in various types corresponding to the recessed holes (5).

According to the present invention, a closure plate and a segment (2)
The member to be fixed to the recessed hole (5) can be separated and easily mounted, so that the dimension of the closing plate can be freely set according to the shape and size of the recessed hole (5), Another object of the present invention is to provide a recessed hole closing device for bolt connection of a concrete segment for a tunnel, which can be easily assembled and fitted into the recessed hole (5).

[0012]

In order to achieve the above object, the device of the present invention is provided with a closing plate slightly larger than the opening surface of the recessed hole for connecting bolts between concrete segments and attached to and detached from the ends of the closing plate. On one surface of the lateral U-shaped fitting portion that can be freely fitted, a retaining plate that can be inserted close to the side surface is provided upright in the concave hole, and the fitting portion is bent on the outer surface of the retaining plate. And a fitting member in which a flexible locking piece is continuously provided, the tip of which is inclined toward the portion and the tip of which is pressed against the inner surface of the recessed hole.

[0013]

When the device of the present invention is pushed into the recessed hole of the concrete segment, each locking piece elastically engages the side surface of the recessed hole so that the recessed hole cannot be removed. Moreover, the device of the present invention can adjust the size of the closing plate and the length of the fitting material appropriately to accommodate various kinds of recessed holes having different shapes and sizes, and if necessary, fit the fitting hole. The material can be fitted to the four sides or any side of the closing plate to be utilized without waste.

[0014]

1 and 2 show an embodiment of the device of the present invention. The same members as those of the conventional device shown in FIG. 5 are designated by the same reference numerals and their description is omitted. The closure plate (12) of the device of the present invention corresponding to the above (7) is a flat plate, and various materials such as wood plate, iron plate, synthetic resin plate can be used.

At both right and left ends of FIG. 1 of the closing plate (12) (hereinafter, the directions refer to FIG. 1), for example, a fitting material (13) molded of a flexible synthetic resin material having appropriate elasticity, The lateral U-shaped fitting portion (14) is detachably fitted.

At the inner end of the upper surface of the fitting portion (14), a retaining plate shorter than the front-rear length of the side surface (5a) is formed in parallel with the side surface (5a) of the recessed hole (5). (15) is erected.

On the outer side surface of the retaining plate (15), a plurality of elastic locking pieces (16) which are oriented in the front-rear direction and incline outward and downward are consecutively arranged vertically with a slight gap between them. Has been done.

In the device of the present invention described above, the retaining plate (15) is provided with a recessed hole.
When pushed into (5), each flexible locking piece (16) is elastically engaged with the side surface (5a) of the recessed hole (5) like the closing plate (7) shown in FIG. , The recessed hole (5) is closed so that it cannot be removed.

After that, the inner surface of the primary lining layer (3) is sealed with a waterproof sheet (S) as described above or to a known surface fastener (17) adhered to the lower surface of the closing plate (12). Sheet (S)
If the non-woven fabric (18) that constitutes one surface is partially fixed and covered, and the concrete for the secondary lining layer (4) is cast, the water blocking sheet (S) becomes the concave hole (5). It will not fall or part of the concrete will flow into the recessed hole (5).

Incidentally, in the above-mentioned embodiment, the obstruction plate (1
Although the fitting materials (13) are fitted to both sides of 2) which are parallel to each other, they may be fitted to four sides or any three sides of the closing plate (12) depending on circumstances.

Further, like the conventional locking piece (11) shown in FIG. 5, the locking piece (16) is formed of rubber or a soft synthetic resin material as a separate body from the retaining plate (15), It's retaining plate (15)
It may be fixed by fitting, adhesion or the like.

[0022]

EFFECT OF THE INVENTION The device of the present invention cuts and assembles the size of the closing plate and the length of the fitting material according to the shape and size of the recessed hole to be fitted, and assembles the shape and size. Since it can accommodate recessed holes of different sizes, it is not necessary to have a large number of different sizes, and it can be easily assembled at the site and is convenient for storage and transportation.

Further, since the required number of fitting materials can be fitted and used on the closing plate in accordance with the shape and size of the recessed hole and the place of use, no waste occurs and the cost is reduced.

[Brief description of drawings]

FIG. 1 is a central longitudinal front view of an embodiment of the present invention.

FIG. 2 is a partially exploded plan view of the same.

FIG. 3 is a vertical sectional front view of a tunnel to which the present invention is applied.

FIG. 4 is a front view of a concrete segment similarly used for tunnel construction.

FIG. 5 is a central longitudinal front view showing an example of a conventional device.

[Explanation of symbols]

(1) Excavation hole (2) Concrete segment (3) Primary lining layer (4) Primary lining layer (5) Recessed hole (5a) Side surface (6) Bolt hole (7) Closure plate (8) Square frame ( 9) Mounting groove (10) Locking band (11) Locking piece (12) Closure plate (13) Fitting material (14) Fitting part (15) Locking plate (16) Locking piece (17) Face fastener (18) ) Non-woven fabric (S) waterproof sheet

Claims (1)

[Scope of utility model registration request] 1. A closure plate slightly larger than the opening surface of a recessed hole for connecting bolts between concrete segments forming a primary lining layer of a tunnel, and a lateral U-shape detachably fitted to an end of the closure plate. On one surface of the fitting portion, a retaining plate that can be inserted close to the side surface is provided upright in the recessed hole, and the outer surface of the retaining plate is inclined toward the bent portion of the fitting portion, and And a fitting member in which a flexible locking piece is continuously provided, the tip of which is in pressure contact with the inner surface of the recessed hole, and a recessed hole closing device for bolt connection of a concrete segment for tunnels.