JPH0384199A - Cut-off structure and its construction - Google Patents

Abstract

PURPOSE:To stop water in a wide range by a simple structure in which a water stopper of a V-shaped cross section, having upper part made of a water-swelling rubber and lower part made of usual rubber, is closely bonded to the triangular space between both segments and fastened with bolts. CONSTITUTION:A water stopper 4 of a V-shaped cross section, having upper part made of a water-swelling rubber and lower part made of usual rubber, is closely attached to a triangular space between the flat joint face and groove 3 of both adjacent segments A. The joint faces of both the unit segments A are matched and a bolt 1 is inserted into the holes of the segments A to clamp the water stopper 4. When a high pressure of groundwater, etc., is loaded from above under the condition, it reaches the space with the groove 3 through the closely contacted joint faces to closely bond the water stopper 4 to the segments A by strong pressing force to the gentle slope direction of the groove 3. A wide range water stopping can thus be exactly obtained by the simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a water-stop structure between segments when a tunnel or the like is constructed by connecting a large number of segments, particularly to a water-stop structure between the segments, especially when high-pressure groundwater or the like flows into the tunnel or the like. The present invention relates to a water-stop structure for preventing water leakage and its construction method.

(Prior Art and its Problems) Conventionally, when constructing a structure such as a tunnel, a plurality of unit segments are joined in the front-rear and left-right directions to form a predetermined structure.

In such structures, especially tunnels installed underground, high pressure is applied to the joints between the unit segments of the tunnel, and underground groundwater seeps out, resulting in a huge amount of seepage over a long period of time. In tunnels through which underground water passes, even if a certain amount of underground water seeps out, it will not have much of an effect, but in cables such as telephone lines, seepage water can have a significant negative impact, and it is necessary to stop water at the joints between the unit segments. This has long been recognized as a very important problem, and many water stoppage methods have been proposed.

A conventional general unit segment has a structure shown in FIG. 8, and the unit segments A are sequentially joined in the circumferential direction and their ends are connected by a straight member to form a tunnel B shown in FIG. 9. It is designed to form a structure. The joint C between adjacent unit segments A receives high pressure from underground as shown by the arrow, and if the water stop at the joint C is insufficient, groundwater will gradually seep out and accumulate in tunnel B. I end up.

Conventionally, in order to eliminate this drawback, as shown in FIG. A rectangular parallelepiped-shaped water stop material E made of a material such as water-expandable rubber with a wide area is installed, and the surface of the unit segment A and the surface of the water stop material E are coated with each other, and the water stop material E is made of, for example, butyl rubber. At the same time as covering the sheet F, a waterproof material E having a width equal to the depth of the groove of the other unit segment A is installed in the groove of the other unit segment A, and the other unit segment A is already fixed in a predetermined position. The unit segment A is pressed against the unit segment A by a sprayer or the like to bring them into close contact, and a bolt (not shown) is passed through the through hole G shown in FIG. 6 to join both unit segments A.

In this joined state, both of the water-stopping materials E are deformed by the pressing force as shown in FIG. 11, and are pressed against each other with a strong force to stop water between both unit segments A.

If this positional relationship is maintained semi-permanently, the water stoppage between the unit segments is almost complete, but in reality, as time passes, a gap begins to form between the two unit segments A. The technique shown in FIG. 11 is intended to use the restoring force of the water-stopping material E to close the gap created by slightly widening the width of the water-stopping material E, thereby achieving complete waterstopping. . However, the restoring force of conventional water-stopping materials is much inferior to 100%, and in reality, it is impossible to completely close the gaps that have arisen. A technique has also been proposed in which the incoming water is absorbed by the water-expandable rubber and the water-expandable rubber is expanded to completely close the gap. However, depending on the expansion rate of water-expandable rubber, if the expansion rate is about 2 to 3 times, it is sufficient as a water-stop material at low pressure, but if the expansion rate exceeds this value, water-expandable rubber becomes The rubber becomes agar-like, and the adhesion of both water-stopping materials E, which are in contact with each other through the sheet F, becomes insufficient, and the incoming water easily passes through both units (segments) and humans, and does not perform its water-stopping function. However, the use of water-expandable rubber is not sufficient to close the gaps created by the use of water-stopping material E described above.

As an improvement to this method, the applicant proposed a water stop structure that utilizes pressure from the high pressure side (Japanese Patent Application No. 63-224551
No. 2), this water-stopping structure is one in which a water-stopping material having elasticity and water resistance is attached to a concave groove as described later, and water is stopped by pressure from the high-pressure side. According to this water-stopping structure, water-stopping in straight sections can be completely achieved by using Class III water-stopping material, but water-stopping at some corners requires the use of main waterstopping material and auxiliary waterstopping material. Two types of waterproof materials are required.

In order to use this structure, which requires two types of water-stopping materials, at construction sites such as tunnels, it is necessary to determine the relative positions of both sides of the timber, which is expected to reduce work efficiency. be done.

(Object of the Invention) Therefore, in view of this problem, that is, it is not possible to easily stop water at a part of a corner where three or more unit segments come into contact, the present invention has been proposed to be able to be constructed more easily and to be able to stop water in a part of a corner where three or more unit segments come into contact with each other. It is an object of the present invention to provide a water-stopping structure that can reliably stop some water, and a method for constructing the water-stopping structure.

(Means for Solving the Problems) The present invention first provides a plurality of unit segments each having a concave groove formed in at least a part of the surrounding joint surface, and a pair of adjacent unit segments. They are joined to each other so that a groove in which a water-stopping material is installed is located on at least one joint surface, and the water-stopping material is pressed toward the low-pressure side by pressure from the high-pressure side, or there is a gap between adjacent unit segments. The water-stop structure deforms the water-stop material by pressure from the high-pressure side and closes the gap at the low-pressure side end of the water-stop material to stop water when a The water-stopping structure is characterized in that at least two layers of the water-stopping material are present between a pair of adjacent unit segments in the vicinity of a point where the unit segments contact, and secondly, the Both concave grooves of a rectangular unit segment, each of which has a horizontal groove having a gentle slope facing the low pressure side along its entire length, are connected to each other to form a concave groove in the shape of a letter in plan view on the half circumference of the unit segment. The L-shaped part of a water-stopping material having water resistance and elasticity and having a protruding tip bent in a substantially vertical direction is attached to the L-shaped groove. The method comprises bringing the tip of the water stop material into contact with the water stop material of another adjacent unit segment, and applying pressure to each unit segment in the direction of each unit segment to close the gap between adjacent unit segments. This is a method of constructing a water-stop structure.

The present invention will be explained in detail below.

First, water stoppage in straight sections will be explained.

The water stop structure of the present invention has a fundamentally different technical concept from the water stop structure of the prior art. In other words, the gap between the unit segments that occurs over time is deformed by the pressure of the water to be stopped, and the deformed water stop material is used to close the gap. In this case, the water-stopping material comes into close contact with the inclined surface of the groove due to the pressure from the high-pressure side and stops groundwater from flowing from the high-pressure side, and as time passes, a gap is created between the two car position segments. In this case, the water stop material deforms due to the pressure from the high pressure side and enters the gap between the two vehicle position segments on the low pressure side and closes the gap. Water can be done completely. In addition, in the present invention, the wider the gap, the greater the deformation of the water-stopping material, and the greater the force to close the gap.In the conventional water-stopping structure, widening the gap directly leads to incomplete water-stopping. In contrast, in the present invention, when the gap is widened, there is no need to pay much attention to the gap itself, and the water-stopping function is dramatically improved.

The water-stopping structure and its construction method according to the present invention can be applied to, for example, tunnels through which people, automobiles, and railway vehicles pass, and cable pipes in which various cables such as telephone lines, power transmission lines, and optical fibers are buried underground. , surrounding walls of subways, elevated passages for expressways and Shinkansen trains, water supply and sewage systems, headrace tunnels in mountains, underground water tanks, dams, ordinary buildings, underground malls, etc.

The unit segments used in the present invention are preferably made of concrete, steel, cast iron, etc., and have grooves formed on the joint surfaces with other adjacent unit segments, as shown in FIG. The unit segment with the groove formed therein may be used as is, or a new unit segment with the groove formed thereon may be manufactured and used, or the existing groove may be filled with an appropriate material. The unit segment of the present invention may be flat and used as a unit segment on the side that does not have a concave groove.However, considering the water stoppage of a part of the corner, which will be described later, the unit segment of the present invention has an L-shaped concave groove on only two adjacent sides. It is preferable that the unit segment is formed into a shape such as a cylinder, a rectangular cylinder, a rectangular parallelepiped, etc. in addition to the arc shape shown in FIG. 8, and the unit segment may be solid or hollow. It may be shaped like a manhole, or it may be already formed into a cylindrical shape, such as a manhole, in which case it will extend only in the length direction.

The cross-sectional shape of the groove is not particularly limited, and in addition to the conventionally widely used trapezoidal cross-section, it can be a horizontal V-shaped cross-section, a circular cross-section, a semi-elliptical cross-section, a rectangular cross-section, etc. It is desirable that an inclined surface be formed on the low pressure side of the groove.
The horizontal v-shaped cross section is optimal. Further, it is preferable that the inclined surface of the concave groove toward the low pressure side is gentle in order to ensure close contact between the water stop material and the unit segment, and for the water stop material to enter the gap and close the gap. Furthermore, it is preferable that the groove be formed only on one of the adjacent unit segments, and the joint surface of the other unit segment be a smooth surface with no unevenness, but it is preferable to form the groove in the same shape at the corresponding location of both vehicle position segments and construct it. Sometimes both grooves may be aligned to form a symmetrical space.

The material of the water-stopping material is not particularly limited as long as it has at least a slight elasticity and water resistance, and examples include ordinary rubber, water-expandable rubber that expands when it comes into contact with moisture, and relatively soft materials such as aluminum. Metal, pieces of wood, etc. can be used. As will be described later, in the water stop structure according to the present invention, when a gap is created between adjacent unit segments and the water stop material is deformed to close the gap, a small gap is created between the water stop material and the unit segment. It is more desirable to form at least a portion of the water-stopping material with the water-expandable rubber because the voids are closed by the expansion of the water-expandable rubber.

It is also preferable that the water stop material has a shape in which the low-pressure side end thereof substantially matches the low-pressure side of the groove. For example, in the case of a pair of grooves having a gentle slope, a wedge-shaped (triangular) It is preferable to have a V-shape (shape) or a V-shape, and when a groove is installed only in one unit segment, the shape may be selected according to the groove, and the shape of the water-stopping material is symmetrical. Further, it is preferable that the water stop material has a pressure receiving part for receiving pressure on the high pressure side, for example, a recessed part on the high pressure side of the water stop material, but the pressure receiving part is not essential.
.

The water-stopping material is made from a water-stopping material that is pasted with an adhesive or a release paper coated with an adhesive on the low-pressure side surface of the concave groove of at least one of the unit segments before construction. Peeling off the release paper and adhering the water stop material to the unit segment so that it is reliably placed in the space formed by both the grooves or the groove and the smooth surface of the other unit segment. In the conventional water-stopping structure, where it is desirable that the water-stopping material of at least one of both vehicle position segments protrudes from the joint surface,
During construction, the water stop material is covered with a cover sheet or the like to prevent the water stop material from coming off when it comes into contact with adjacent unit segments, causing problems in the construction work.

However, since the construction work is often carried out underground and under humid conditions, the use of such a cover sheet significantly reduces work efficiency. In order to accommodate the water stop material in the groove, it is desirable that the water stop material slightly protrudes from the joint surface, but not so much as to require the use of a cover sheet, and it is preferable that no cover sheet is used. When the water barrier material has a gentle slope toward the low pressure side, if adjacent unit segments are brought close to the water stop material from the low pressure side, the tips of the unit segments will move along the gentle slope. Separation of the water stop material can be almost completely prevented, especially if the water stop material is V
In the case of the shape, the gentle slope portion of the waterproof material contacts the unit segment and curves inward to completely absorb the contact with the unit segment. Furthermore, when a groove is formed in only one unit segment, there is almost no protrusion of the water-stopping material, and there is no need to consider its separation.

The water stop structure and its construction method of the present invention can be applied without making any changes to the structure, from water stop locations where only low pressure is applied to water stop locations where extremely high pressure is applied, and the higher the applied pressure, the more reliable it is. This is an epoch-making invention that overturns the conventional wisdom that water can be stopped. Moreover, its structure is much simpler and more economical than conventional structures, as it does not necessarily require the use of a cover sheet.

Next, the water stop structure in a part of the corner and its construction method will be explained. The basic idea behind water stopping at this part of the corner is the same as that for the above-mentioned straight line part, but it is necessary to introduce a different idea due to the special nature of the part of the corner.

A part of a corner is a place where three or more unit segments, usually three or four, come into contact, and unless the water-stopping material is the same length as one side of the unit segments and a bent tip is formed, the corner is Although the waterproof materials contact each other in some areas, high-pressure water cannot be stopped simply by contact, and even if a complete water stop is achieved in a straight section, water leaks at some corners. It becomes meaningless to stop water in a straight part.The present invention increases the volume of the water stop material in the corners where it is difficult to stop water than in the straight part. The aim is to achieve a complete watertight seal by tightly adhering the product.

As a method for increasing the volume, the present invention adopts a method in which normally in a straight section, there is one layer of water-stopping material between adjacent unit segments, but in a part of a corner, there are two or more layers of water-stopping material. As a specific method, the unit segment 2
The two tips of the cross-shaped main body of the single-character water stop material to be installed in the single-character groove provided on the side are bent in the direction of the other two sides of the unit segment. do. In this case, a short concave groove in which the tip of the water stop material to which the water stop material is attached is accommodated is formed at a substantially right angle following the end of the single-shaped water stop material of the water stop material. You don't have to do it.

When pressure and force are applied to multiple unit segments equipped with the water-stopping material, one layer of water-stopping material is usually used in straight sections where it is easy to stop water, and two or more layers are applied at corners where it is difficult to do so. Water is stopped by the water stop material, and the water stop material in a part of the corner is compressed more strongly to achieve complete water stop.

In addition, it is preferable that the water-stopping material having a tip is integrally molded with a letter-shaped main body and a tip bent at a substantially right angle from the main body. Sometimes, it may be bent and attached to the groove, but this method creates a curve at the bent part, which tends to cause water leakage, so it is preferable to manufacture it by molding with a mold. .

(Example) Examples of the present invention will be described below with reference to the accompanying drawings, but the examples are not intended to limit the present invention.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the water stop structure according to the present invention, FIGS. 2 and 3 are enlarged views of the groove portion in FIG. 1, and FIG. Figure 3 is a longitudinal cross-sectional view showing the water-stop state when a water-stop material is placed in the groove of the unit segment and there is no gap between both unit segments. FIG. 3 is a longitudinal cross-sectional view showing a water-stopping state when the water-stopping material is deformed by the pressure and closes the gap on the low-pressure side.

As shown in FIGS. 1 and 8, a space 2 for inserting a bolt L is formed at the inner edge of both sides of the arc-shaped concrete unit segment A, and a bolt insertion hole G is formed between the space 2 and the outside.
are screwed therein, and bolt insertion holes G are also screwed into the inner edge of the unit segment A in the circumferential direction at approximately equal intervals.

The upper part of the bolt insertion hole G on two adjacent sides of the unit segment A has an upper side (high pressure side where groundwater etc. permeates).
A horizontal V-shaped concave groove 3 is formed which has a steep slope and a gentle slope on the lower side (low pressure side inside a tunnel or the like). Adjacent 100 unit segment) A is a triangular space formed by aligning a flat bonding surface and a bonding surface on which the groove 3 is formed. On the gentle slope on the low pressure side of the space, a water stop material 4 having a V-shaped cross section that becomes thinner toward the low pressure side is in close contact with the water stop material 4 whose outer slope is equal to the slope of the gentle slope. A V-shaped pressure receiving part 5 that receives pressure from the high pressure side is formed on the inner edge of the water stop material 4, and the upper part of the water stop material 4 is made of water-expandable rubber 6, and the lower part is made of ordinary rubber 7.

In order to construct the unit segment) A to achieve the state shown in Fig. 2, apply an adhesive to at least one outer gentle slope of the waterproof material 4, or peel off the release paper and adhere it with an adhesive. After adhering the unit segment A to the low-pressure side slope of the concave groove 3 so that its end coincides with the end of the slope, the other unit segment A is brought closer from below to align both bonding surfaces. Insert bolt 1 into insertion hole G and segment (100 units) A
Tighten.

In the state shown in Fig. 2, when high pressure is applied from the high pressure side (upper part of Fig. 2) due to groundwater, etc. as shown by the arrow, the pressure reaches the space formed by the groove 3 through the closely bonded joint surface. As shown in , the water stop material 4 is pressed in the direction of the gentle slope of the groove 3, and a stronger force is applied to bring the water stop material 4 into close contact with the unit segment A. As shown in FIG. 3, when a gap 8 is formed between the unit segments A over time, higher pressure groundwater etc. flows into the space from the high pressure side, and as shown by the arrow, the water stop material 4 is pressed in the direction of the gentle slope of the groove 3. Then, the waterproof material 4 is deformed, and its lower end enters the gap 8, forming a strong contact with the joint surface at the upper end of the gap, as shown in FIG.

The adhesion force increases as the pressing force from the high pressure side increases. Therefore, according to the water stop structure of this embodiment, it is possible to reliably perform water stop over a wide range from the low pressure region to the high pressure region.

Further, in this case, even if the water stop material 4 deforms and closes the gap 8, there is a possibility that voids will be created at other locations when the water stop material 4 deforms. As mentioned above, in this case, if a part of the water stop material is made of water-expandable rubber, the water-expandable rubber expands and closes the void, thereby achieving more complete water stop. can.

The shape of the surrounding movement and the water-stopping material in the water-stopping structure of the present invention are not limited to the present example, and the resulting gap □
Any shape may be used as long as a portion thereof can be deformed to enter the gap and close the gap.

FIG. 4 is a cross-sectional plan view showing the water-stopping structure of a part of a corner of an embodiment of the water-stopping structure according to the present invention, and FIG. 5 is a vertical cross-sectional view taken along the line V-V in FIG. 4. .

As shown in FIG. 4, the water stop material 4 of this embodiment has a main body 9 which has an L-shaped bottom and is attached to the groove 3, and integral moldings at right angles to both ends of the main body 9. It consists of a pair of tip portions 10, and in a part of the corner where the three unit segments A contact, the 1-shaped main body 9 of the water cutoff material 4 and the tip portion lO of the other water cutoff material 4 come into contact with each other. A layer of waterproof material 4 is present. In Fig. 4, for convenience, there is a space between the unit segment A and the water stop material 4, but in reality, the water stop material 4 is compressed almost completely due to strong pressure from the front, back, left, and right directions. Space is closed. Since there is more water-stopping material in some corners where it is difficult to stop water than in straight parts, the water-stopping material is compressed more strongly to give stronger water-stopping ability, and to stop water in some corners, it is difficult to stop water in straight parts. It can be made complete to the extent that it is comparable to water stopping.

In this embodiment, each unit segment is arranged in a staggered manner to form a part of a T-shaped corner, but in addition, each side of adjacent unit segments is aligned to form a part of a cross-shaped corner. Even in a part of the corner, water stoppage can be achieved using a waterstop material consisting of a straight-shaped main body with a bent tip.

FIG. 6 is a cross-sectional plan view showing another embodiment of the water-stopping structure at the corner part of the water-stopping structure according to the present invention, and FIG.
A cross-sectional view taken along the vertical line ``--'' in FIG. 6.

This embodiment is a modification of the embodiment shown in FIGS. 4 and 5, and the same members are given the same reference numerals and their explanations will be omitted.

As shown in FIG. 6, the water stop material 4 of this embodiment has the same shape as the water stop material 4 shown in FIG. An engagement groove 31 having substantially the same shape as the tip portion 10 is formed.

At a part of the corner where three unit segments A contact each other, a water stop material 4 is installed in the groove 3 of one unit segment.
The main body 9 of the unit segment A and the tip end 10 of the water stop material 4 attached to the engagement groove 3° of the adjacent unit segment A come into contact with each other, so that two layers of the water stop material 4 are present. Each water stop material 4 is compressed by strong pressure from the front, rear, left and right directions, and completely seals water at a portion of the corner to a degree comparable to water stop at a straight portion.

In this embodiment, each unit segment is arranged in a staggered manner to form a part of a T-shaped corner, but in addition, each side of adjacent unit segments is aligned to form a part of a cross-shaped corner. Even in a part of the corner, water stoppage can be achieved using a waterstop material consisting of a straight-shaped main body with a bent tip.

In addition, in order to verify the pressure that can stop water in a straight section,
A bolt is installed on the circumference of two disc-shaped simulated unit segments, the water stop material according to the present invention is sandwiched between both simulated unit segments, and colored water is applied between both simulated unit segments to change the water pressure. We designed a water stop model that could be injected with water, and used a pump with a compression limit of 30 kg/d to inject the colored water and gradually increase the pressure.
There was no leakage of colored water up to 30-/d, and there was no change in the water-stopping material.

(Effects of the Invention) Firstly, the present invention has a plurality of unit segments in which grooves are formed in at least a portion of the surrounding joint surfaces, and is fixed to at least one joint surface of a pair of adjacent unit segments. They are joined to each other so that the groove in which the water material is installed is located, and pressure from the high pressure side pushes the water stop material to the low pressure side to stop water, or when a gap occurs between both vehicle position segments. The water stop structure deforms the water stop material by the pressure to close the gap, and the water stop material has at least two layers between a pair of adjacent unit segments near a point where three or more of the unit segments contact each other. This water-stop structure is characterized by the presence of a water-stop material.

In the conventional water-stopping structure, the water-stopping material is divided into two parts in the direction of the joint surface of the unit segment, and both of the water-stopping materials are pressed with a force in a direction substantially perpendicular to the joint surface, and the water-stopping materials are mutually separated by the pressing force. It is designed to stop water due to its elasticity. However, in actual constructions, gaps tend to form between the unit segments over time, and when such gaps occur, the pressing force between the two water-stopping materials naturally decreases significantly, resulting in insufficient water-stopping materials. Since deterioration of the water-stopping material causes a decrease in its elasticity, water-stopping between unit segments of structures that are subjected to particularly high pressures has not actually been achieved at present.

However, as mentioned above, the water stop structure of the present invention has the water stop material placed in contact with both vehicle position segments to be joined, and the water stop material is deformed by the pressure applied to the water stop material, and the water stop material is deformed between the two vehicle position segments to be joined. Since the resulting gap is closed, no matter how high the pressure is applied, water will not leak from the gap between the water stop material and the concave part of the unit segment where water may leak. Since between the grooves, the water-stopping material is tightly adhered to the grooves using the pressure of the underground water, etc., almost perfect water-stopping is ensured.

Moreover, since the present invention has two or more layers of water-stopping material near a part of a corner where three or more unit segments are close to each other, it is difficult to compress the water-stopping material at a part of the corner where it is difficult to stop water. The water-stopping degree of the part of the corner can be made comparable to the water-stopping degree of the straight part. Furthermore, the number of parts used, including water-stopping materials, is significantly smaller, construction work is easier, no skill is required, and manufacturing costs can be reduced, making it extremely economical.

The water stop structure of the present invention can be applied to a wide range of pressures, from water stoppages in relatively low-pressure locations, such as above-ground railway tunnels, to water stoppages in locations that are subject to considerably high pressures, such as subway walls installed deep underground. This is an unprecedented, revolutionary structure that can reliably shut off water with a simple structure, and is particularly useful as a water-stopping structure for cables that are extremely sensitive to water, such as telephone lines.

Further, according to the construction method according to the present invention, such a water-stopping structure can be provided, and the same effects as the water-stopping structure can be provided.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the water stop structure according to the present invention, FIGS. 2 and 3 are enlarged views of the groove portion in FIG. 1, and FIG. FIG. 3 is a vertical cross-sectional view showing a water-stop state when there is no gap between segments; FIG. FIG. 5 is a cross-sectional plan view showing an example of a water-stopping state at a part of the corner of the water-stopping structure, FIG. 5 is an enlarged longitudinal cross-sectional view taken along the line V-V in FIG. 4, and FIG. FIG. 7 is a cross-sectional plan view showing another embodiment of the water-stopping structure of a part of the corner of the water structure; FIG. FIG. 9 is a vertical cross-sectional view of a tunnel formed using a plurality of unit segments, and FIGS. 10 and 11 are examples of conventional water-stopping structures between unit segments. It is a longitudinal cross-sectional view showing an example. ...Unit segment 3...Concave groove...Engagement groove 4...Water stop material...Pressure receiving part 6...Water expandable rubber...Rubber 8...Gap...Single-shaped body 10...Tip Qusr'/if X (content = 4)th! Figure +: 3;”:r Figure 6 Figure ξ′, 7 2: Procedural amendment (method) Relationship of the case to the indicated case

Claims (5)

[Claims] (1) A plurality of unit segments each having a groove formed on at least a part of the surrounding joint surfaces are arranged so that a groove with a waterproof material installed on at least one joint surface of a pair of adjacent unit segments is located. A water-stopping structure in which the water-stopping material is pressed to the low-pressure side by pressure from the high-pressure side and water is stopped by joining each other to A water-stop structure characterized in that at least two layers of the water-stop material are present between a pair of unit segments. (2) The unit segment has a substantially rectangular shape in top view with L-shaped grooves continuous in a substantially vertical direction formed only on two adjacent sides, and the water-stopping material is accommodated in the grooves, and both sides The portion is bent in a substantially vertical direction to protrude from the groove, and at least two layers of the water-stopping material are present between a pair of adjacent unit segments near a point where three or more of the unit segments touch. The water stop structure according to claim 1. (3) A plurality of unit segments each having a groove formed in at least a part of the surrounding joint surfaces are arranged so that a groove with a waterproof material installed on at least one joint surface of a pair of adjacent unit segments is located. The water-stopping material is pressed to the low-pressure side by the pressure from the high-pressure side, and the water-stopping material is deformed by the pressure from the high-pressure side when a gap is created between adjacent unit segments. A water-stopping structure that shuts off water by closing the gap at the low-pressure side end of the water-stopping material, the water-stopping structure having at least one water stopper between a pair of adjacent unit segments near a point where three or more of the unit segments contact each other. A water-stop structure characterized in that there are two layers of the water-stop material. (4) At least a portion of the water-stopping material is made of water-expandable rubber, and the voids created when the water-stopping material deforms and closes the gaps between unit segments are closed by expansion of the water-expandable rubber. The water stop structure according to claim 3. (5) Both concave grooves of a rectangular unit segment in which a horizontal concave groove having a gentle slope facing the low pressure side is formed on each of two adjacent sides along its entire length are connected to form a half circumference L in plan view of the unit segment. The L-shaped water stop material has a water-resistant and elastic L-shaped main body that is bent in a substantially vertical direction and protrudes from the L-shaped groove. Attach the main body, bring the tip of the water stop material into contact with the water stop material of another adjacent unit segment, and apply pressure to each unit segment in the direction of each unit segment to close the gap between adjacent unit segments. A construction method for a water-stop structure comprising: