JP3929323B2 - Segments using sealing material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a segment using a sealing material used in a shield method.
[0002]
[Prior art]
The shield method is the main construction method in the construction of underground pipes. However, the construction of large cities is in the direction of deeper layers and larger sections, and the construction conditions are becoming severe, such as high groundwater pressure and restrictions on existing underground structures. Therefore, improvement of water stop technology is strongly desired.
[0003]
FIG. 17 is an explanatory diagram illustrating an example of a shield tunnel. The shield tunnel A is formed by joining a plurality of segments 1 between the segments via a sealing material. Conventionally, in the construction of a shield tunnel as shown in FIG. 17, as a sealing material for water-stopping a joint portion of a segment, a sealing material having a water-stopping function based on rubber compression is used (hereinafter referred to as “Prior Art 1”). ").
[0004]
Further, in recent years, a seal material using a water-expandable rubber having a further improved water-stopping function has been used with an increase in the depth of the shield tunnel (hereinafter referred to as “prior art 2”). However, the sealing material using the water-expandable rubber of the prior art 2 is also aimed at improving the compressive force of the rubber, and is basically a technique in which the sealing material of the prior art 1 is extended.
[0005]
[Problems to be solved by the invention]
Since the prior art 1 opposes the water pressure using the compressive force of rubber, there is a weak point that the water stop function cannot be performed when the water pressure exceeds the compressive force.
[0006]
Further, the sealing material using the water-expandable rubber of the prior art 2 has a higher degree of safety because the compressive force is larger than that of the prior art 1, but includes the same problems as the prior art 1 regarding water pressure.
[0007]
Accordingly, an object of the present invention is to solve the conventional problems in the shield method and provide a segment using a sealing material having a water stop function capable of resisting high water pressure.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, in the segment using the sealing material, a cut is provided in an end surface of the sealing material arranged between the segments that is not joined to the segment, and the sealing material is arranged on both sides of the sealing material. The joint end surfaces with the formed segments are not fixed, and the cuts of the sealing material are provided on the respective sides of the joint end surfaces on both sides, and the segments are sealed between the segments on both sides. A groove is provided, and an interval between the segments in the seal groove is formed larger than an interval between the segments not provided with the seal groove, and the sealing material is disposed in the seal groove. It has the characteristics.
[0014]
In the present invention, the sealing material is arranged at the joint portion of the segment in the same manner as in the prior art. However, the feature of the present invention is that the joining end surface (“ This is to provide a function for enhancing the close-contacting action and the water-stopping action by increasing the adhesive force of the “joint end face”. The conventional sealing material has a rectangular or oval cross-sectional shape, but a cut having a predetermined depth is provided on the end surface not joined to the segment of the sealing material, that is, the end surface on the side on which water pressure acts. Yes. Of the joint end faces, the joint end face closer to the position where the cut is provided is not fixed (adhered), and only the joint end face far from the cut is fixed.
[0015]
In the present invention, the joint end faces on both sides are not fixed, but a cut is provided on each side of the joint end faces on both sides, and the adhesion of the joint end faces on both sides is enhanced by these two cuts .
[0016]
A concrete segment and a steel segment can be applied as the present invention segment. A rubber seal material can be used as the seal material of the present invention. A water-swellable rubber can also be used. Water-swellable rubber is rubber that absorbs water and expands by osmotic pressure.
[0017]
The cut of the sealing material can be produced by a simple method. For example, a method of cutting the sealing material main body to make a cut, or a rubber plate is further stacked on the surface of the rubber sealing material main body, a part of the overlapped part is adhered, and the remaining part is not adhered without being adhered. It is a method of making a part a break.
[0018]
The sealing material disposed between the segments closes the joint end surface by the compressive force of the sealing material (rubber) itself. Furthermore, the cut is opened by the pressure of the water that has entered the cut, and the sealing material on the side of the cut is brought into close contact with the segment, increasing the blocking effect. Since the adhesion force increases according to the pressure of the intruding water, it can cope with any water pressure as long as the rubber is not broken, and an excellent water stop effect is brought about.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0020]
[ Reference Example 1 ]
FIG. 1 is a cross-sectional view showing a joint portion of a segment according to Reference Example 1 of the present invention. As shown in FIG. 1, a sealing material 3 having a rectangular cross section is disposed between the segment 1 and the segment 2. Segments 1 and 2 are made of concrete. The sealing material 3 is made of rubber. The joining end face 4 where the end face of the sealing material 3 and the end face of the segment 1 are joined is fixed by means such as adhesion. On the other hand, the joining end face 5 where the end face of the sealing material 3 and the end face of the segment 2 are joined is not fixed but is in contact.
[0021]
A cut 7 having a predetermined depth is provided on an end surface of the sealing material 3 that is not joined to the segments 1 and 2, that is, the end surface 6 on the side on which hydraulic pressure acts. As shown in FIG. 1, the cut 7 is provided on the end face 6 on the side where more water pressure acts. Further, the cut 7 is provided over the entire length of the sealing material of the end face 6. The cut 7 is provided at a position closer to the bonded end surface 5 that is not fixed than the fixed bonded end surface 4.
[0022]
Since the sealing material 3 and the segment 2 are not fixed to the joining end surface 5, water can pass downward through the joining end surface 5 by water pressure. However, by providing the cut 7 on the bonded end face 5 that is not fixed, the cut 7 is opened by the pressure of the infiltrated water into the cut 7, and the sealing material 3a on the side surface of the cut 7 is brought into close contact with the segment 2 and the bonded end face. 5 is blocked. Since the adhesive force increases according to the pressure of the intruding water into the cut line 7, it can cope with any water pressure as long as the sealing material 3 (rubber) is not broken.
[0023]
The present invention can be applied to concrete segments and steel segments. Moreover, the sealing material used for this invention can also be used for sealing uses other than a segment. A rubber seal material is used as the seal material, but a water-expandable rubber can also be used.
[0024]
4 to 7 and FIG. 15 are cross-sectional views showing the sealing material. 4-7 and FIG. 15, the joining end surface 4 is fixed, and the joining end surface 5 is not fixed. The sealing material 8 shown in FIG. 4 is provided by cutting the cut 9 in the sealing material main body. In the sealing material 10 shown in FIG. 5, the rubber plate 11 is overlapped on the surface of the sealing material main body 10a, and a part 11a of the overlapped contact part is adhered, and the remaining part is left without being adhered. This remaining portion functions as the cut 12. 8 and 9 are cross-sectional views for explaining the cuts in the sealing material. The cut line 18 shown in FIG. 8 has a circular bottom in order to prevent the cut line from expanding due to water pressure. The cut 19 shown in FIG. 9 has a wide entrance so that the cut is easily subjected to water pressure.
[0025]
The sealing material 13 shown in FIG. 6 has a cut 14 on the joining end face 5 side. And the part by the side of the joining end surface 4 from the cut | interruption 14 of the sealing material 13 is deleted leaving the protrusion part 13a by the side of the joining end surface 5. FIG. In FIG. 6, the protruding portion 13 a comes into close contact with the segments 2 and 22 (see FIGS. 1 and 2) on the joining end face 5 side due to the pressure of the intrusion water into the cut line 14. The sealing material 15 shown in FIG. 7 is substantially the same shape as the sealing material 13 of FIG. 6, but the rubber plate 16 is overlaid on the surface of the sealing material main body 15 a with the protruding portion 16 a protruding, and the overlapping contact portion 16 b is formed. A cut 17 is provided by bonding. The protrusion 16a is brought into close contact with the segments 2 and 22 (see FIGS. 1 and 2) on the joining end face 5 side due to the pressure of the intruding water into the cut line 17. The seal material 47 shown in FIG. 15 is an example in which the cut line of the seal material shown in FIG. 6 is inclined. 4 to 7 and FIG. 15 each have a rectangular cross section, other shapes such as a circular cross section may be used.
[0026]
[ Reference Example 2 ]
2 is a cross-sectional view showing a joint portion of a segment according to Reference Example 2 of the present invention, and FIG. 3 is a perspective view. In FIG. 3, the description of the segment 22 on the other side is omitted. As shown in FIGS. 2 and 3, seal grooves 23 and 24 are provided in the joining end surface portions of the segments 21 and 22. Sealing material 3 used in Example 2 is the same as the seal member 3 shown in FIG. 1 used in Reference Example 1. The cut 7 is provided on the end face that is not joined to the segments 21 and 22 of the sealing material 3, that is, the end face 6 on the side on which water pressure acts. In the seal groove 23, the joining end surface 25 between the sealing material 3 and the segment 21 is fixed, while in the sealing groove 24, the joining end surface 26 between the sealing material 3 and the segment 22 is not fixed. In this reference example , the sealing materials shown in FIGS. 4 to 7 and FIG. 15 used in Reference Example 1 can be used.
[0027]
[Embodiment 1 ]
FIG. 10 is a cross-sectional view showing the sealing material according to Embodiment 1 of the present invention. As shown in FIG. 10, the sealing material 31 according to the present embodiment has two cuts 32 and 33. The cuts 32 and 33 are provided on the respective sides of the joining end faces 4 and 5 (25 and 26) with the segments on both sides. In addition, in FIGS. 10-13, the joining end surfaces 4 and 5 are described. Such a sealing material 31 is disposed between the segments 21 and 22 shown in FIGS. 2 and 3 (not shown). Then, the joining end faces 4, 5 (25, 26) between the sealing material 31 and the segments 1, 2 (21, 22) are not fixed, but are only brought into contact with each other.
[0028]
The sealing material 31 and the segments 1 and 2 (segments 21 and 22) are brought into close contact with each other at the joining end surfaces 4 and 5 (25 and 26) by the pressure of the water that has entered the cut lines 32 and 33, and the segments 1 and 2 (21 and 22). Sufficient blockage and water stop function can be provided between them.
[0029]
10-14 is sectional drawing which shows the Example of a sealing material. Among the sealing materials shown in FIGS. 10 to 14, the sealing material 31 shown in FIG. 10 is provided by cutting two cuts 32 and 33 in the seal body. In the sealing material 34 shown in FIG. 11, the rubber plates 35 and 36 are overlapped on both surfaces of the sealing material main body 34a, the overlapping contact portions 35a and 36a are bonded, and the remaining portions are left without bonding. . The remaining portions 37 and 38 function as breaks. The sealing material 39 shown in FIG. 12 functions as the cuts 40 and 40 with the central portion removed, leaving the protruding portions 39a and 39a on the joint end faces on both sides. The sealing material 41 shown in FIG. 13 has rubber plates 42 and 43 stacked on both surfaces of the sealing material main body 41a with the protruding portions 42a and 43a protruding, and the overlapping contact portions 42b and 43b are bonded to each other to form a cut 44. , 45 are provided. The seal material 46 shown in FIG. 14 is an example in which the cut line of the seal material shown in FIG. 12 is inclined.
[0030]
In addition, a cut | interruption may provide a width | variety like FIGS. 1-2, FIGS. 6-9, FIGS. 12-15, and may contact | abut as FIG. 4-5 and FIGS.
[0031]
[ Reference Example 3 ]
FIG. 16: is sectional drawing which shows the joint part of the segment which concerns on the reference example 3 of this invention. In this reference example , the sealing materials are joined together. As shown in FIG. 16, the joining end face 55 where the end face of the sealing material 53 and the segment 51 are joined is fixed by means such as adhesion. A joining end face 56 where the end face of the sealing material 54 and the segment 52 are joined is fixed by means such as adhesion. A joining end surface 57 where the sealing material 53 and the sealing material 54 are joined is not fixed and is in contact with the sealing material 53.
[0032]
On the end surfaces of the sealing materials 53 and 54 other than the joining end surfaces 55, 56 and 57, that is, the end surfaces 58 and 59 on which water pressure acts, cuts 60 and 61 having a predetermined depth are provided. The cuts 60 and 61 are provided on the end surfaces 58 and 59 on the side where more water pressure acts. Further, the cuts 60 and 61 are provided over the entire length of the sealing material of the end surfaces 58 and 59. The cuts 60 and 61 are provided at positions closer to the joint end face 57 than the joint end faces 55 and 56.
[0033]
【The invention's effect】
As described above, according to the present invention, the following useful effects are brought about.
(1) In addition to the compression force of the rubber of the sealing material, a cut is made in the sealing material so that water can enter the cut, and the cut is opened by the pressure of the water that has entered, and the sealing material on the side of the cut is pressed against the segment In this way, close contact and excellent water blocking effect can be obtained.
(2) Even if the water pressure becomes higher than the compressive force of the rubber that constitutes the sealing material due to the increase in depth due to the provision of the cut, the cut is opened by the pressure of the water that has entered the cut and the side seal of the cut The material adheres to the segment, and an excellent blocking and water-stopping effect is obtained.
(3) By providing two cuts and causing them to act on the joint end faces on both sides, a high water stop effect can be obtained at the joint end faces on both sides.
(4) In order to make a cut in the seal material, a method of cutting and providing a cut in the seal material body made of rubber, or a part where the rubber plate is overlapped on the surface of the seal material body and a part of the overlapped part is bonded, and the part is not bonded It can be easily manufactured by a method such as a method of making a cut.
(5) According to the sealing material and the segment of the present invention, the sealability of the segment joint portion is improved, and the construction performance of the shield method is improved by using it for a shield tunnel or the like.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a joint portion of a segment according to Reference Example 1 of the present invention.
FIG. 2 is a cross-sectional view showing a joint portion of a segment according to Reference Example 2 of the present invention.
FIG. 3 is a perspective view showing a joint portion of a segment according to Reference Example 2 of the present invention.
FIG. 4 is a cross-sectional view showing sealing materials according to Reference Examples 1 and 2 of the present invention.
FIG. 5 is a cross-sectional view showing sealing materials according to Reference Examples 1 and 2 of the present invention.
FIG. 6 is a cross-sectional view showing sealing materials according to Reference Examples 1 and 2 of the present invention.
FIG. 7 is a cross-sectional view showing sealing materials according to Reference Examples 1 and 2 of the present invention.
FIG. 8 is a cross-sectional view for explaining a cut line of a sealing material.
FIG. 9 is a cross-sectional view for explaining a cut line of the sealing material.
FIG. 10 is a cross-sectional view showing a sealing material according to Embodiment 1 of the present invention.
FIG. 11 is a cross-sectional view showing a sealing material according to Embodiment 1 of the present invention.
FIG. 12 is a cross-sectional view showing a sealing material according to Embodiment 1 of the present invention.
FIG. 13 is a cross-sectional view showing a sealing material according to Embodiment 1 of the present invention.
FIG. 14 is a cross-sectional view showing a sealing material according to Embodiment 1 of the present invention.
FIG. 15 is a cross-sectional view showing a sealing material according to Reference Examples 1 and 2 of the present invention.
FIG. 16 is a cross-sectional view showing a joint portion of a segment according to Reference Example 3 of the present invention.
FIG. 17 is an explanatory diagram showing an example of a shield tunnel.
[Explanation of symbols]
1, 2 Segment 3 Seal material 4, 5 Joint end face 6 End face 7 Cut 8, 10, 13, 15 Seal material 9, 12, 14, 17 Cut 11, 16 Rubber plate 18, 19 Cut 21, 22 Segment 23, 24 Seal Grooves 25, 26 Joining end faces 31, 34, 39, 41, sealing materials 32, 33, 37, 38, 40, 44, 45 Cuts 35, 36, 42, 43 Rubber plates 46, 47 Sealing materials 51, 52 Segment 53, 54 Sealing material 55, 56, 57 Joint end face 58, 59 End face 60, 61 Cut A Shield tunnel

Claims (1)

In a segment using a sealing material, a cut is provided in the end surface of the sealing material arranged between the segments that is not joined to the segment, and the joining end surface of the sealing material and the segments arranged on both sides thereof is fixed. The cut of the sealing material is provided on each side of the joint end faces on both sides, and a seal groove is provided on each of the segments on both sides between the segments. The interval between the segments is formed larger than the interval between the segments not provided with the seal groove, and the seal material is used in the seal groove. segment.

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