JPH0423995Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a water-stopping structure at the joint in an underground joint type shield device configured to join two shield machines with a penetrating ring. It is something.

"Prior Art" The applicant first developed a shield tunnel in which two shield machines were connected by a penetration ring so that the tunnels excavated by both shield machines could be penetrated. (Japanese Patent Application Laid-Open No. 62-258095).

Figures 12 to 15 show the state in which the above construction method is implemented using a shielding device comprising two shielding machines, that is, a first shielding machine 1 and a second shielding machine 2 as a set. It shows.
In these figures, reference numeral Gi indicates the ground near the junction of the shield tunnel, and within this ground Gi, the first shield machine 1 excavates the first tunnel Ta using the cutter device 10, and excavates the second tunnel Ta. A shield machine 2 is excavating a tunnel Tb using a cutter device 20. The wall surface of tunnel Ta is primarily lined with segments 3a, 3a..., and the wall surface of tunnel Tb is lined with segment 3.
Primary lining is being carried out by b, 3b...

The above first shielding machine 1 has a cylindrical skin plate 1a, the tip end 1b of which is doubled by an outer cylinder 11 and an inner cylinder 12.
A storage chamber R ₁ in which the penetration ring 13 is stored is formed by the inner cylinder 12 and the bearing pressure plate 15 .
A partition plate 14 is provided inside the inner cylinder 12, and a plurality of extrusion jacks 17 are installed in the circumferential direction inside the storage chamber _R1 , and the base ends of these extrusion jacks 17 are connected to a bearing plate. The rod 17a is fixed to the inner surface of the penetrating ring 15, and the tip of the rod 17a is in contact with the rear surface of the penetrating ring 13. Further, a plurality of propulsion jacks 18 are attached to the rear surface of the bearing pressure plate 15 in its circumferential direction, and the tips of the rods 18a of these propulsion jacks 18 are adapted to abut against the side surfaces of the segments 3a. Also,
The cutter device 10 is formed to have a slightly smaller diameter than the inner cylinder 12, and its shaft body 19 is pivotally supported by the partition plate 14. Flexible cutter part 10
A is provided.

On the other hand, the second shield machine 2 has a skin plate 2a formed in a cylindrical shape with the same diameter as the skin plate 1a in the first shield machine 1, and its tip 2b is connected to the skin plate 2a in the first shield machine 1. Similarly, the outer cylinder 21 and the inner cylinder 22 form a double structure, and the outer cylinder 21, the inner cylinder 22, and the bearing plate 25 form a penetration chamber _R2 into which the tip of the penetration ring 13 is inserted. It is formed. A partition plate 24 is provided inside the inner cylinder 22, and a skin plate 2
A ring-shaped bearing plate 23 is fixed inside a,
On the rear surface of this bearing plate 23, there is a propulsion jack 2 with a negative number.
8, . . . are attached, and the tip of the rod 28a is brought into contact with the side surface of the segment 3b. Further, the cutter device 20 is provided with a cutter portion 20a and a shaft body 29 configured similarly to the cutter device 10 described above. In addition, the first and second
As shown in FIG. 13, mud injection pipes 16 and 26 are disposed at the tips of the shield machines 1 and 2, respectively.

To excavate a tunnel using the first and second shield machines 1 and 2, first, as shown in FIG. 12, the first shield machine 1 is used to excavate the ground Gi, and the wall Segments 3a, 3a... were lined, and by taking the reaction force, one tunnel Ta
At the same time, the second shield machine 2 similarly constructs the other tunnel Tb.
Then, as shown in FIG. 13, when the first shield machine 1 and the second shield machine 2 face each other at the joint of the tunnel, leaving a predetermined length of ground Gi (approximately 30 cm to 1 m), The cutting portions 10a, 20a at the tips of the cutting devices 10, 20 are shortened. next,
As shown in FIG. 14, the extrusion jack 17 of the first shielding machine 1 is driven to move the penetrating ring 13 stored in the storage chamber _R1 so that its tip end is inserted into the penetrating chamber of the second shielding machine 2. The penetration ring 13 joins the first shield machine 1 and the second shield machine 2 until it is inserted into R ₂ , and also removes the ground mass of the tunnel joint left between them. covered from the outside by a penetrating ring. Thereafter, the ground Gi is excavated by the cutter device 10 or the cutter device 20 to penetrate both tunnels Ta and Tb, and then, as shown in FIG. 15, the cutter devices 10 and 20 are dismantled and removed. The partition plates 14 and 24 are cut and removed, and both ends of the penetrating ring 13 are welded to the inner cylinders 12 and 22, and concrete 31 including the thickness of the secondary lining is formed on the inner wall surfaces of the skin plates 1a and 2a. The tunnel will be joined by pouring concrete and lining the walls of the joint to complete the tunnel joint.

According to the construction method explained above, the penetration ring 13
Since the remaining ground Gi is excavated inside the shield machines 1 and 2 after joining the two shield machines 1 and 2, the penetration ring 13 is used to retain earth and water at the joint, and therefore, for example, the area around the joint is Compared to the case of using the freezing construction method, which involves retaining earth and stopping water by freezing the ground, it is possible to shorten the construction period and reduce construction costs.

"Problems to be solved by the invention" However, in the above construction method, it is necessary to consider the misalignment of the axes of both shield machines 1 and 2, so as shown in FIG. A space must be provided between the inner walls of storage room _R1 and penetration room _R2 , so there is a risk that groundwater in the ground G may enter through that space. Water-stopping properties are not necessarily sufficient, and improvements have been desired.

This idea improves the water-stopping properties of the joints in the above-mentioned underground joint type shield equipment, and also has a water-stopping structure that can ensure sufficient water-stopping properties even if the axes of both shield machines are misaligned. is intended to provide.

"Means for Solving the Problems" In order to achieve the above purpose, this invention has the following objectives: When the tip of the penetrating ring is inserted into the penetrating chamber,
interposed between the circumferential surface of the tip of the penetrating ring and the inner wall surface of the penetrating chamber, and between the circumferential surface of the rear end of the penetrating ring and the inner wall surface of the storage chamber, and between them. The present invention is characterized in that a water stop member for blocking the entire circumference of the penetrating ring is attached to either the circumferential surface of the penetrating ring or the inner wall surface of each of the chambers.

The above-mentioned water-stopping member is made of, for example, highly water-absorbent rubber that expands in volume when it absorbs water, or has a shape that stands up when heated and contacts both the circumferential surface of the penetrating ring and the inner wall surface of each chamber. It is conceivable to form it with a shape memory alloy, urethane rubber, a nylon brush, etc.

"Embodiments" Hereinafter, the first to fourth embodiments of this invention will be explained with reference to FIGS. 1 to 11.
Since these embodiments are applied to the above-mentioned underground bonding type shield device, a description of the shield device itself will be omitted.

First, a first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 shows the first and second shield machines 1 and 2 facing each other with a slight ground Gi left between them, and FIG. 2 shows the penetrating ring 13 from the first shield machine 1. The figure shows a state in which it has been pushed out and its tip has been inserted into the penetration chamber _R2 of the second shield machine 2.

The penetration ring 13 stored in the storage chamber _R1 of the first shield machine 1 on the right side in FIG.
Water stop members 41, 41, 42, and 42 made of highly water-absorbent rubber are provided on the inner circumferential surface and outer circumferential surface of the penetrating ring 1 and the inner circumferential surface and outer circumferential surface of the rear end thereof, respectively.
It is attached around the entire circumference of 3. When superabsorbent rubber comes into contact with moisture, its volume can expand without impairing its elasticity. Water stop member 41,
42 are each shaped like a belt and are glued to the penetrating ring, and water stop members 41 and 42 attached to the outer circumferential surface of the tip end and the inner circumferential surface of the rear end of the penetrating ring 13 are provided with water-stop members 41 and 42 that extend from the rear to the front. A notch was once made, and a penetrating ring 13
Water stop members 41 and 42 attached to the inner circumferential surface of the tip end and the outer circumferential surface of the rear end are cut from the front toward the rear.

In addition, the inner wall surface of the storage chamber _R1 , that is, the outer cylinder 11
Water stop brushes 43, 4 for primary water stop are provided on the inner surface of the inner cylinder 12 and the outer surface of the inner cylinder 12, located at the front of the storage chamber _R1 .
These water stop brushes 43, 43 contact both the inner and outer surfaces of the penetrating ring 13, respectively, and during normal excavation, these water stop brushes 43, 43 prevent the penetrating ring 1 from closing.
3 and the inner wall surface of the storage room _R1 is closed. Further, the storage chamber R ₁ is filled with a filler 44 such as grease or glycerin, and this filler 44 causes the water stop member 4 to
This prevents moisture from coming into contact with the water stop members 41 and 4 during normal excavation.
2 from expanding.

On the other hand, in the penetration chamber R _{2 of} the second shield machine 2 on the left in FIG.
5 are arranged. A rod 46 of a jack (main body not shown) fixed inside the skin plate 2b of the second shield machine 2 is connected to this ring member 45.
5 is moved in the front and back direction by the jack, and during excavation, it is located at the front of the penetration chamber R ₂ as shown in Figure 1 to prevent the intrusion of earth and sand, and also protects both shield machines 1 and 2. When they are joined, as shown in FIG. 2, they are drawn deep into the penetration chamber _R2 , allowing the penetration ring 13 to be inserted into the penetration chamber _R2 . This ring member 4
Water-stop brushes 47 and 48 similar to the water-stop brush 43 described above are attached to both the inner and outer peripheral surfaces of the ring member 5, and during normal digging, these water-stop brushes 47 and 48 close the ring member. 45 and the inner wall surface of the penetration chamber _R2 is closed. The above-mentioned penetration ring 13 is pushed out by the rod 17a of the extrusion jack 17, and its tip end is inserted into the penetration chamber _R2 as shown in _FIG . (The above-mentioned ring member 45 that has been inserted is retreated to the inner part of the penetration chamber R ₂ ) This joins both shield machines 1 and 2, but the tip of the penetration ring 13 is inserted into the penetration chamber R _2. The water stop members 41, 41 attached to the tip of the penetrating ring 13 are located at the front inside the penetration chamber _R2 , and the water cutoff members 41, 42 attached to the rear end of the penetration ring 13 are retracted. It will be located at the front in room _R1 .

When groundwater enters the joint as shown by the arrow in FIG. It closes the gap between the peripheral surface and the inner wall surface of the penetration chamber R ₂ and the storage chamber R ₁ , and therefore effectively prevents groundwater from entering the inside of both the joined shield machines 1 and 2. , sufficient water-stopping properties can be ensured. Furthermore, each of the water stop members 41 and 42 has a notch so as to open toward the direction in which groundwater intrudes when expanded, so that the water stop members 41 and 42 are protected by the water pressure of the intruding water. It is strongly pressed against the walls of the containment room R ₁ and the penetration room R ₂ , and therefore, even when groundwater pressure is high, it can exhibit excellent water-stopping properties.

In this first embodiment, by using super absorbent rubber as the water stop members 41 and 42, even if the axes of both shield machines 1 and 2 are misaligned, the water stop members 41 and 42 expand according to the size of the gap, as shown in FIG. 4, so that the water-stopping property is not impaired.

In addition, in this first embodiment, when the penetrating ring 13 is pushed out, the water stop members 41, 41 attached to the tip end of the penetrating ring 13 touch the water stop brush 43.
In order to prevent damage from water and ground G, the water stop members 41, 4 are installed as shown in FIG.
A protective plate 49 made of a metal plate or the like is provided at the front of 1.
49 may be attached in an inclined state.

The first embodiment has been described above, and next, the second embodiment will be described with reference to FIGS. 6 and 7.
This second embodiment is an example in which a shape memory alloy is used as the water stop member. That is, the penetrating ring 1
A plurality (in this example, five pieces each) of water stop members 50 made of annular shape memory alloy are provided at the tip and rear end of the outer peripheral surface of the penetrating ring 13 and at the rear end of the inner peripheral surface of the penetrating ring 13, respectively. is installed. The water stop members 50 made of these shape memory alloys have their proximal edges fixed to the penetrating ring 13 by welding or the like, and under normal conditions they overlap each other as shown in FIG. The ring 13 is tilted toward the circumferential surface of the penetrating ring 13, but when heated to a predetermined transformation temperature, it returns to its memorized shape and stands up in the direction of the arrow in FIG. be. Further, a water stop member 51 made of a shape memory alloy similar to the above is attached to the inner wall surface inside the penetration chamber _R2 , and this water stop member 51...
When heated, it returns to its memorized shape and stands up in the direction of the arrow.

Water stop member 50 made of the above shape memory alloy...
The penetrating ring 13 to which the penetrating ring 13 is attached is pushed out with each of the water stop members 50..., 51... lying down, and its tip end is inserted into the penetrating chamber _R2 . After that, a hot water supply pipe 5 is installed in both chambers R ₁ and R ₂ .
2, 53 to supply hot water to each water stop member 50.
By heating . . . , 51 . . . above the transformation temperature, each water stop member _{50 .} , R ₂ , so that the water stop members 50 , 51 , and 51 contact between the penetrating ring 13 and the inner walls of both chambers R ₁ and R ₂ .
... to ensure sufficient water-tightness.
Furthermore, each of the water stop members 50..., 51... is made to stand up in a direction in which it is pressed against the walls of both chambers _R1 , _R2 by the intruding water, so that the water pressure of the intruding water is reduced. Sufficient water-stopping properties can be exhibited even at high temperatures.

Also in this second embodiment, since the shape memory alloy is restored in accordance with the size of the distance between the penetration ring 13 and each chamber R ₁ and R ₂ , the axes of both shield machines 1 and 2 Sufficient water-tightness can be ensured even if the water is misaligned. In addition, the 6th
Reference numerals 54 and 55 in the figures and FIG. 7 are hot water return pipes.

Next, a third embodiment will be described with reference to FIGS. 8 and 9. This third embodiment is an example in which urethane rubber is used as the water stopper member, and FIG. 8 is a side sectional view showing the tip of the penetration ring 13 stored in the storage chamber _R1 , and FIG. 9 FIG. 2 is a side sectional view showing the tip of the penetration ring 13 inserted into the penetration chamber _R2 .

In this third embodiment, water stop members 60, 60 made of urethane rubber are attached to the inner peripheral surface and outer peripheral surface of the penetration ring 13, respectively, and these water stop members 60, 60 are attached to the inner peripheral surface and the outer peripheral surface of the penetration ring 13. When the ring 13 is stored in the storage chamber _R1 , it is packed in the storage chamber _R1 in a compressed state as shown in FIG. 8, and the tip of the penetration ring 13 is inserted into the penetration chamber _R2 . When this happens, it is packed into the penetration chamber _R2 as shown in FIG. Although not shown in the drawings, similar to the first and second embodiments, a water stop member is attached to the rear end of the penetrating ring 13 on both the inner and outer circumferential surfaces in the same manner as the water stop member 60 described above. The space between the penetration ring 13 and the storage chamber _R1 is closed by these water stop members.

In this third embodiment, the gap between the penetrating ring 13 and both chambers R ₁ and R ₂ is closed with urethane rubber that has high hardness, high elasticity, and sufficient wear resistance. In addition, due to the deformation of the urethane rubber, the first,
As in the case of the second embodiment, it is possible to sufficiently cope with misalignment of the axes of both shield machines 1 and 2.

Next, with reference to FIGS. 10 and 11, the fourth
An example will be explained. This fourth embodiment is an example in which a pile-shaped nylon brush is used as the water stop member. That is, on both the inner and outer circumferential surfaces of the penetration ring 13, water stop members 70, 70 made of nylon brushes processed into a pile shape are implanted in a sufficiently dense state, and the water stop members 70, 70 are inserted into the penetration ring 13 in a sufficiently dense manner. By closing the gap between the ring 13 and both chambers R ₁ and R ₂ , water-tightness is ensured, and the deformation of the nylon brush also prevents misalignment of the axes of both shield machines 1 and 2. It is possible to respond. Note that the nylon brush is not limited to a pile-shaped brush, and a loop-shaped brush may of course be used.

Although the embodiments of this invention have been described above, this invention is not limited to the above embodiments. For example, the water-stopping member is not limited to those shown in each of the above embodiments, and other materials may also be used.
Different types of water stop members may be used in combination as appropriate. Furthermore, in each of the above embodiments, the water-stopping member is interposed on both the inner circumferential surface side and the outer circumferential surface side of the penetrating ring, but the water-stopping member may be attached to at least one of the sides. . However, it goes without saying that the method described above is more effective because the water is stopped twice inside and outside the penetrating ring. In addition, the water stop member may be attached to the penetration ring or to the inner wall surface of the penetration chamber or storage chamber.In short, when both shield machines are joined by the penetration ring, A water stop member may be interposed between the circumferential surface of the ring and the inner wall surfaces of both chambers to close the gap.

Note that the ring member 45 shown in the first and second embodiments is not necessarily provided, and
Water stop brushes 43, 47, and 48 for primary water stop may also be omitted if unnecessary.

"Effect of the invention" As explained in detail above, according to this invention, there is a gap between the circumferential surface of the tip of the penetrating ring and the inner wall surface of the penetrating chamber, and between the circumferential surface of the rear end of the penetrating ring and the storage area. Since the water-stopping member is interposed between the inner wall surface of the chamber and the space between them is closed, it is possible to sufficiently ensure water-stopping properties of the joint when both shield machines are joined, and Even if the axes of both shield machines are deviated, the effect can be sufficiently coped with.

[Brief explanation of the drawing]

1 to 11 show embodiments of this invention. Figures 1 to 4 show a first embodiment in which highly absorbent rubber is used as the water-stopping member, Figure 1 is a side sectional view showing the state before the penetrating ring is pushed out, and Figure 2 is a side sectional view of the penetrating ring. Fig. 3 is an enlarged sectional view showing the state in which the water stopper made of highly absorbent rubber has expanded inside the penetration chamber, and Fig. 4 shows that the axes of both shield machines are aligned. FIG. 7 is an enlarged sectional view showing an expanded state of the water stop member when it is out of alignment. FIG. 5 is a side sectional view showing another configuration example of the first embodiment. Figures 6 and 7 show a second embodiment in which a shape memory alloy is used as the water-stopping member, Figure 6 is a side sectional view showing the state before the penetrating ring is pushed out, and Figure 7 is a side sectional view showing the state before the penetrating ring is pushed out. FIG. 3 is a side sectional view showing the state after being pushed out. 8 and 9 show a third embodiment in which urethane rubber is used as the water stop member, FIG. 8 is a side sectional view showing the state of the water stop member before the penetrating ring is pushed out, and FIG. It is a side sectional view showing the state of the water stop member in the penetration chamber. 10 and 11 show a fourth embodiment in which a nylon brush is used as the water stop member, FIG. 10 is a side sectional view showing the state of the water stop member before the penetration ring is pushed out, and FIG. It is a side sectional view showing the state of the water cutoff member in a penetration chamber. FIGS. 12 to 15 are side sectional views showing the construction procedure of the underground bonding method for shield tunnels in order of process. R ₁ ... Storage room, R ₂ ... Penetration room, 1 ... First shield machine, 2 ... Second shield machine, 13 ...
Penetration ring, 41, 42, 50, 51, 60, 7
0...Water stop member.

Claims (1)

[Claims for Utility Model Registration] (1) A first shield machine having a storage chamber in which a cylindrical penetrating ring is stored in the distal end thereof, and a penetrating chamber in which the distal end of the penetrating ring is inserted. A pair of second shielding machines having the above-mentioned shielding machines are provided as a set, and the penetration ring stored in the penetration chamber is pushed forward with the tips of the first and second shielding machines facing each other. A waterproof structure for a joint in an underground joint type shield device configured to join both shield machines underground by inserting the tip of a penetration ring into the penetration chamber of the second shield machine. When the distal end of the penetrating ring is inserted into the penetrating chamber, the space between the circumferential surface of the distal end of the penetrating ring and the inner wall surface of the penetrating chamber, and the circumferential surface of the rear end of the penetrating ring and the inner wall surface of the storage chamber, respectively, and the 〓
A joint in an underground joint type shield device, characterized in that a water-stopping member that closes the gap around the entire circumference of the penetrating ring is attached to either the circumferential surface of the penetrating ring or the inner wall surface of each of the chambers. Water-stop structure. (2) The underground bonding type according to claim 1, wherein the water stop member is made of highly water-absorbent rubber that expands in volume when it absorbs moisture. Water-stop structure for joints in shield devices. (3) The water stop member is formed of a shape memory alloy that stands up when heated and returns to a shape that contacts both the peripheral surface of the penetrating ring and the inner wall surface of each of the chambers. A water-stopping structure for a joint in an underground joint type shield device according to claim 1 of the utility model registration claim. (4) A water-stopping structure for a joint in an underground joint type shield device according to claim 1, wherein the water-stopping member is made of urethane rubber. (5) A water-stop structure for a joint in an underground joint type shield device according to claim 1, wherein the water-stop member is formed of a nylon brush.