JPH0682200U - Recessed hole blocking device for bolt connection of concrete segment for tunnel - Google Patents

Abstract

(57) [Abstract] [Purpose] The blocking plate and the member for fixing it to the recessed hole of the concrete segment can be freely set in the dimensions of the blocking plate according to the shape and size of the recessed hole. And easy to assemble so that it can fit into the recessed hole. [Structure] A fitting portion 14 of a flexible fitting material 13 is fitted to an end portion of the closing plate 12, and a retaining plate 15 which can be inserted into the recessed hole 5 is provided on an upper surface of the fitting portion 14. The retaining plate 15 is provided on the outside surface of the concrete segment 2 by connecting the locking piece 16 to the outside surface of the retaining plate 15 which is inclined downward and the tip of which is in pressure contact with the side surface 5a of the recessed hole 5.
The recessed hole 5 can be closed by simply pushing it into the recessed hole 5, and the size of the closing plate 12 and the length of the fitting material 13 can be reduced.
It can be freely set according to the shape and size of the recessed hole 5 and can be easily assembled and used.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present 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 excavated hole in the ground, and forms a waterproof sheet on the inner surface. In order to prevent the waterproof sheet from falling into the bolt connection recesses of the segment due to the pressure of the concrete when the second cover layer is placed and the secondary lining layer is placed inside the recesses, The present invention relates to a device for closing an opening surface.

[0002]

[Prior art]

 As shown in Fig. 3 and Fig. 4, the segment type tunnel has a large number of plate-shaped concrete segments that are pre-fabricated in an arc shape in order from the end to the excavation hole (1) excavated in the ground. 2) is connected in an annular shape with bolts (not shown) to form a cylindrical primary lining layer (3), and the inner surface of which is a waterproof sheet for preventing seepage of spring water from the ground. (S) is affixed, and concrete is placed between the inner surface and the cylindrical formwork (not shown) built inside it to form the secondary lining layer (4). Be built.

To connect the segments (2) forming the primary lining layer (3), the recessed hole (5) and the recessed hole (5) and the outer surface are preliminarily provided at the end of each segment (2). The bolt holes (6) communicating with each other are formed in advance, and the bolts (not shown) are inserted through the bolt holes (6) of the adjacent segments (2).

However, in the state described above, concrete for forming the secondary lining layer (4) is placed on the inner side of the water blocking sheet (S) attached to the inner surface of the primary lining layer (3). Then, the water blocking sheet (S) may fall into the recessed hole (5), and the water blocking sheet (S) may be damaged or the water blocking effect may not be obtained.

Further, when placing the secondary lining concrete directly 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 is hardened, 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 a flat rectangular frame (8) slightly smaller than the opening surface is provided on the back surface (upper surface of FIG. 5). The mounting groove (9) having a dovetail-shaped cross section is formed on the outer peripheral surface of the mounting member and extends in a direction parallel to the closing plate (7).

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

In the above-mentioned closing plate (7), when the rectangular frame (8) is pushed into the recessed hole (5), each flexible locking piece (11) is moved to the side surface (5a) of the recessed hole (5). ), Each locking piece (11) is inclined as described above, and the side surface (5a) is rough and has some irregularities, so the closing plate (7) is pulled out to the recessed hole (5). Incompletely fit.

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), and then used for the second lining layer (4). If concrete is poured, there is no risk that the water blocking sheet (S) will fall into the recessed hole (5) or that concrete will flow into the recessed hole.

[0010]

[Problems to be solved by the device]

 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 when the scale of the tunnel is different. It is necessary to prepare various kinds of holes corresponding to the concave holes (5).

According to the present invention, the shape and size of the recessed hole (5) are made by making the closing plate and the member for fixing the blocking plate in the recessed hole (5) of the segment (2) separable and easy to install. Depending on the size, etc., the size of the closing plate can be freely set, and the device can be easily assembled and fitted into the recessed hole (5). It is intended to be provided.

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the device of the present invention comprises a closing plate which is slightly larger than the opening surface of the concave connecting hole for bolt connection between concrete segments, and a lateral U-shape which is detachably fitted to the end of the closing plate. On one surface of the fitting part, a retaining plate that can be inserted close to the side surface is installed upright in the recessed hole, and the outer surface of the retaining plate is inclined toward the bent part of the fitting part. 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.

[0013]

[Action]

 In the device of the present invention, when this is pushed into the concave hole of the concrete segment, each locking piece elastically engages the side surface of the concave hole to block the concave hole irremovably. Moreover, the device of the present invention can appropriately adjust the size of the closing plate and the length of the fitting material 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]

【Example】

 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 the description thereof will be omitted. The closing 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.

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

At the inner end of the upper surface of the fitting portion (14), which is substantially parallel to the side surface (5a) of the recessed hole (5) and is substantially parallel to the side surface (5a), the stopper plate is shorter than the front-rear length. (15) is erected.

On the outer surface of the retaining plate (15), a plurality of elastic locking pieces (16) which are inclined in the front-rear direction and incline outward and downward are continuously provided side by side with some gaps therebetween. Has been done.

In the device of the present invention described above, if the retaining plate (15) is pushed into the recessed hole (5), like the closing plate (7) shown in FIG. However, it elastically engages the side surface (5a) of the recessed hole (5), and closes the recessed hole (5) irremovably.

Thereafter, the inner surface of the primary lining layer (3) is adhered to the lower surface of the closing plate (12) by a known surface fastener (17) with the water blocking sheet (S) as described above, If the non-woven fabric (18) constituting one surface of the water blocking sheet (S) is partially fixed and covered, and a concrete for the secondary lining layer (4) is placed, the water blocking sheet (S) Will not fall into the recessed hole (5) and part of the concrete will not flow into the recessed hole (5).

In the above-mentioned embodiment, the fitting materials (13) are fitted on both sides of the closing plate (12) which are parallel to each other, but depending on the case, four sides of the closing plate (12) or You may fit in arbitrary three sides.

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 or the like as a separate body from the retaining plate (15). Alternatively, it may be fitted to the retaining plate (15) and fixed by adhesion or the like.

[0022]

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 items of different sizes, and it can be easily assembled at the site and is convenient for storage and transportation.

Furthermore, since the required number of fitting materials can be fitted and used on the closing plate according to the shape and size of the recessed hole and the place of use, no waste occurs and the cost is low.

[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 closing plate that is slightly larger than the opening surface of a recessed hole for connecting bolts between concrete segments that form a primary lining layer of a tunnel, and a lateral U-shape that is detachably fitted to an end of the closing plate. A retaining plate that can be inserted close to the side surface of the fitting portion is provided on one surface of the fitting portion, 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 the recessed hole closing device for bolt connection of a concrete segment for a tunnel.