JP5178123B2 - Tube-type water-stop material and water-stop method using tube-type water-stop material - Google Patents

Description

  The present invention relates to a tube-type water-stopping material for use in water-stopping between a main girder and a precast floor slab placed on the upper side of the main girder, and a water-stop by a tube-type water-stopping material. It is about the method.

  In recent years, a construction method using a precast floor slab has come to be frequently used as one construction method of a bridge slab.

  When implementing a bridge erection method using this type of precast slab, as shown in FIG. 5, a main girder (bridge girder) 2 extending in the direction of the bridge axis is spaced apart in the width direction on the pier 1 at a necessary interval. Install several. Next, a water stop material (bridge girder seal material) 3 is attached to both edge portions in the width direction of the upper surface of each main girder 2 so as to extend in the longitudinal direction of each main girder 2, that is, in the bridge axis direction. Next, on the upper side of each main girder 2 arranged in the width direction, after placing the precast floor slab 4 extending across the main girder 2 in the width direction from above the waterstop 3, The concrete 5 as a grout material is filled between the water stop materials 3 at both ends in the width direction of the main girder 2 compressed between the upper surface of the main girder 2 and the upper precast floor slab 4. The precast floor slab 4 is fixed to the main girder 2 by driving.

  For this purpose, the water-stopping material 3 is compressed between the upper surface of the main girder 2 and the precast floor slab 4 placed on the main girder 2, thereby replacing the main frame when filling concrete. Until the concrete 5 filled between the girder 2 and the precast floor slab 4 is hardened and exerts its strength, the concrete 5 does not drip (prevent leakage) from between the main girder 2 and the precast floor slab 4. It is.

  As the water-stopping material 3, a closed-cell foam made of closed-cell polyethylene foam, rubber sponge, or the like formed into a long square bar shape is used. Further, a water blocking material 3 having a rectangular cross section in which a foam layer containing many open cells and a closed cell foam layer are laminated in two or three layers (see, for example, Patent Document 1) In addition, a water-stopping material 3 (see, for example, Patent Document 2) having a substantially semi-elliptical cross section by an open-cell foam has been proposed.

JP 2003-155708 A JP 2003-155709 A

  However, the water-stopping material 3 that has been conventionally used has a rectangular cross-section that is easy to manufacture or a substantially semi-elliptical cross-section, and a flat portion of the outer periphery thereof is affixed to the main girder 2, and When the precast floor slab 4 is placed on the main girder 2 and compressed to the required dimensions, the upper surface side of the water blocking material 3 is pressed against the lower surface of the precast floor slab 4 by the restoring force from this compressed state. Since the precast floor slab 4 is placed on the upper side of the main girder 2 as described above, the concrete 5 is filled between the main girder 2 and the precast floor slab 4 as described above. Furthermore, when the precast floor slab 4 expands or contracts in the width direction of the bridge, that is, in a direction perpendicular to the longitudinal direction of the main girder 2 due to a temperature change or the like, the upper surface side closely contacts the lower surface of the precast floor slab 4 as described above. Is the water stopping material 3 that is as a circumstances is that cases peel offset from the beginning of the bonding position of the upper surface of the main girders 2 has occurred.

  Therefore, in the place where the water-stopping material 3 is displaced and peeled off, in order to prevent the leakage of the concrete 5 from the place, it is necessary to repair the water-stopping material 3 that has shifted before the concrete 5 is placed. Therefore, this repair work takes time and effort.

  By the way, in recent years, after the precast floor slab 4 is placed on the upper side of the main girder 2, the precast floor is placed on the main girder 2 in order to adjust the finished height of the existing structure and the precast floor slab 4 installation height. It has been desired to have a structure in which the height of the plate 4 can be changed by several tens of millimeters in the vertical direction. However, the above-mentioned conventional water-stopping material 3 is affixed on the main girder 2, and the precast floor slab 4 is placed from above and compressed to the required dimensions, thereby forming the formwork when filling concrete. Since it is designed to exhibit alternative strength and leakage prevention performance, changing the height of the precast floor slab 4 above the main girder 2 will cause under-compression and formwork when filling concrete As a result, there is a risk that the strength of the above cannot be fully exhibited. Therefore, when using the above-mentioned conventional water-stopping material 3, it is difficult to cope with a construction method in which the height of the precast floor slab 4 is changed above the main beam 2.

  Therefore, the present invention can exert a sound water-stopping effect at the time of placing concrete even if a difference in behavior occurs due to a temperature change or the like between the main girder and the precast slab placed thereon as described above. In addition, we will provide a tube-type water-stopping material that can exhibit a sufficient water-stopping effect even when the height of the precast slab is changed above the main girder, and a water-stop method using the tube-type water-stop material It is what.

In order to solve the above-mentioned problem, the present invention corresponds to claim 1 in a required portion of a tube body that extends in a linear shape and has both ends in the longitudinal direction closed and is normally flat. A tube-type water-stop material provided with an air injection valve is disposed so as to extend in the longitudinal direction of a member that desires water-stop, and the center portion in the width direction of the lower surface of the flat-state tube-type water-stop material is the upper surface of the member. Then, after placing another member that desires water stop on the member from above the tube-type water stop material, the tube-type water stop material is expanded, and the tube-type water stop material is It is set as the water stop method by the tube-type water stop material which makes it stick to an upper member and stops between two members which want water stop.

In configuration described above, the two members overlooking the water stop, as the main girder and precast slab to place on its upper side, between both inflating the tube-type water stopping material between the main beam and the precast slab The method is to stop the water. In addition, the tube-type water-stopping material is inflated so that the outer shape of the cross-sectional shape becomes a round shape by injecting air from a flat state, and the water-stopping material is stopped between two members that desire water-stopping To do.

According to the present invention, the following excellent effects are exhibited.
(1) to the predetermined position of the tube body in a normal flat state each other in both end portions of the required size extending and longitudinally closed immediately linear tube type water stopping material formed by providing an air inlet valve, water stop It is arranged so as to extend in the longitudinal direction of the desired member, and the widthwise central portion of the lower surface of the flat tubular water-stopping material is attached to the upper surface of the member. After the above-mentioned member is placed from above the tubular water-stopping material, the tubular water-stopping material is expanded, and the tubular water-stopping material is brought into close contact with the upper member so that the water-stopping member is between Since there is a water-stop method using a tube-type water-stopping material that stops water, if the tube-type water-stop material is flattened with the air removed, it is arranged in the gap between two members that want water-stopping. In a state of being in close contact with the two members that desire the water stop Therefore, even if a difference in behavior occurs due to expansion / contraction due to a temperature change or the like between two members that desire the water stop, it is possible to prevent the tube type water stop material from being displaced or peeled off in advance. it can. As a result, it becomes possible to eliminate the work for repairing the displacement and peeling of the water-stopping material as required when using the conventional water-stopping material.
(2) Since the tube-type water-stopping material is inflated by injecting air, the tube-type water-stopping material is brought into close contact with the two members that desire water-stopping. Can be made to follow well.
( 3 ) The location where water leakage has occurred in the tubular water-stopping material by inflating the tube-type water-stopping material of the tube body so that the outer shape of the cross-sectional shape becomes round by injecting air from the flat state. The wedge-shaped gap formed between the lower portion of the tube body of the expanded tubular water-stopping material and the upper surface of the main girder, and the upper portion of the tube body of the expanded tube-type water-stopping material In order to seal the location where water leakage has occurred in the conventional rectangular cross-section water-stopping material, the sealing material has only to be filled in two places above and below the wedge-shaped gap formed between the bottom surface of the precast floor slab. In addition, it is possible to stop water more easily with a small amount of the sealing material as compared with the case where the sealing material is filled on the entire surface in the vertical direction of the water stopping material.
( 4 ) The two members that want to stop water are used as a precast floor slab placed on the main girder and the upper side of the main girder, and the tube type water stop material is expanded between the main girder and the precast floor slab to stop water between the two. By doing so, even when there is a difference in behavior between the main girder and the precast slab placed on it due to temperature changes, etc., it is sound when concrete is placed. It is advantageous to obtain a sufficient waterproof effect when the height of the precast floor slab is changed above the main girder. Can do.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 (a) (b) to FIG. 3 (b) to (b) show one embodiment of a tube-type water-stopping material and a water-stop method using the tube-type water-stopping material according to the present invention. The tube-type waterstop material 6 is configured by providing an air injection valve 8 at a required portion in the longitudinal direction of a tube body 7 made of a material having a required elasticity extending at both ends and closed at both ends, for example, rubber.

  Specifically, the tube body 7 is formed in a straight tube shape with the same material as the bicycle tire tube defined in JISK6304. Further, the outer shape of the cross-sectional shape is made round by injecting air.

  Further, a required portion in the longitudinal direction of the tube body 7, for example, an outer tire surface near one end in the longitudinal direction, is similar to an automobile tire valve defined in JIS D4207 or a bicycle tire valve defined in JIS D9422. The air injection valve 8 is attached.

  Furthermore, although not shown in the figure, the width of the lower surface side of the tube body 7 of the tubular water-stopping material 6 that becomes flat when the air is removed, more specifically, the lower portion of the tube-type water-stopping material 6. You may make it provide a double-sided tape and a sealing material as an adhesive means in the direction center part, for example.

  When the above-described tubular water-stopping material 6 is used for bridge construction work using a precast floor slab, as shown in FIGS. Is removed to keep the tube body 7 flat. The air injection valve 8 is arranged in the same plane as the tube body 7 in the flat state.

  As in the prior art, a plurality of main girders 2 extending in the direction of the bridge axis are installed on the pier 1 with a required interval in the width direction, and then the width direction end edges of the upper surface of each main girder 2 are shown in FIG. As shown in (a), the tubular water-stopping material 6 in the flat state is arranged so as to extend in the longitudinal direction of each main girder 2, that is, in the direction of the bridge axis, so that the tube-type water-stopping material in the flat state is provided. 6 is attached to the upper surface of each main girder 2 with a double-sided tape or a sealing material as a bonding means (not shown). At this time, the length dimension of the tube-type waterstop material 6 as the required length dimension is such that the concrete 5 as the grout material is inserted between the upper surface of the main girder 2 and the precast floor slab 4 thereabove in a later step. When the size of the area that needs to be sealed in the bridge axis direction when filling is insufficient, the tube-type waterstops 6 are sequentially arranged in series along the width direction both end edges of the upper surface of each main girder 2. Arrange and paste. Further, if there is a surplus in the length dimension of the tube-type water-stopping material 6, the other end portion, which is the end portion on the side away from the air injection valve 8 in the tube body 7, is bound tightly in the required dimension, or After the required dimensions are cut, the cut ends are hermetically closed by bonding or welding with an adhesive, and the length of the tube body 7 through which air can be injected through the air injection valve 8 is adjusted to be appropriately short. What should I do?

  Next, a precast floor slab 4 that extends in the width direction across the main girders 2 is placed on the upper side of the main girder 2 arranged in the width direction from above the tubular waterproof material 6.

  Thereafter, immediately before the concrete 5 as the grout material is placed between the upper surface of each main girder 2 and the precast floor slab 4 thereabove, as shown in FIG. A compressed air supply source (not shown) such as a compressor or an air cylinder is connected to the air injection valve 8 of the material 6 (see FIGS. 1A and 1B). Pressurized air is injected into each of the tube bodies 7 so that each tube body 7 is sequentially expanded between the main beam 2 and the precast floor slab 4. Thereby, the lower end portion of each expanded tube body 7 is brought into close contact with the upper surface of the main girder 2 and the upper end portion of each expanded tube body 7 is brought into close contact with the lower surface of the precast floor slab 4. Become. As described above, when pressurized air is injected into each tube body 7 to expand it, the pressure of the pressurized air supplied from the pressurized air supply source is not damaged by excessive expansion in each tube body 7. The pressure range may be set in advance.

  After inflating each tube type water stop material 6 as mentioned above, each tube type water stop material 6 arranged in series along the width direction both ends edge of the upper surface of each main girder 2 adjoins. As shown in FIG. 2 (c), the ends are pasted with a sealing material 9 such as a modified silicon-based material, and water stopping and fixing between the adjacent ends of each of the tube-type water stopping materials 6 are performed. .

  Thereafter, a water leak test was performed on each tubular water-stopping material 6 in contact with the upper surface of the main girder 2 and the lower surface of the precast floor slab 4 by inflating as described above. In this case, as shown in FIG. 2 (d), the water leaking portion is wedge-shaped formed between the lower portion of the expanded tubular water-stopping material 6 and the upper surface of the main girder 2 below it. The concrete 5 is placed in a later step in a wedge-shaped gap formed between the upper portion of the tube-type water-stopping material 6 expanded and the lower surface of the precast floor slab 4 above it. Sealing is performed by filling the sealing material 9 from the side, that is, from the width direction central portion side of each main girder 2.

  After that, the grout material is placed in the space surrounded by the upper surface of each main girder 2, the lower surface of the precast floor slab 4, and the tubular water-stopping material 6 expanded at both end edges in the width direction of each main girder 2. The concrete 5 as is filled. As a result, the precast floor slab 4 and the main beam 2 are fixed. In addition, after the concrete 5 filled between the precast floor slab and the main girder 2 is cured, the tube-type waterstop material 6 may be left as it is, or may be removed as necessary. Also good.

  Thus, according to the water-stop method 6 and the water-stop method using the tube-type water stop material 6 of the present invention, when the precast floor slab 4 is placed on the upper side of each main girder 2, What is necessary is just to affix the water stop material 6 along the width direction both-ends edge part in the upper surface of the said main girder 2 in the flat state which extracted air, and the tube type which is in the flat state before this air injection | pouring Since the water-stopping material 6 is not firmly attached to the lower surface of the precast floor slab 4 in a state where the precast floor slab 4 is placed on the upper side of each main girder 2, it is attached to each main girder 2. Even if the precast floor slab 4 expands and contracts in the direction perpendicular to the longitudinal direction of the main girder 2 due to temperature change or the like above the tubular water-stopping material 6, the tube-type water-stopping material 6 is displaced or peeled off. It is possible to prevent the possibility of occurrence. Therefore, the work for repairing the deviation and peeling of the water-stopping material as required when using the conventional water-stopping material can be eliminated. Therefore, it is possible to reduce the time and labor of bridge construction work.

  Further, since the tube-type waterstop 6 is inflated by injecting air, it is brought into close contact with the upper surface of the main girder 2 and the lower surface of the precast floor slab 4. The unevenness of the lower surface of the precast slab 4 can be satisfactorily followed. Therefore, it is possible to obtain a sound water-stopping property capable of preventing leakage of the concrete 5 placed between the two in order to fix the precast floor slab 4 to the main beam 2.

  Furthermore, since the tubular water-stopping material 6 is formed so that the outer shape of the cross-sectional shape becomes round by injecting air, the portion where water leakage has occurred in the tube-type water-stopping material 6 is as follows. As shown in FIG. 2 (d), a wedge-shaped gap formed between the lower part of the expanded tubular water-stopping material 6 and the upper surface of the main girder 2 below, and the expanded tubular type Sealing can be performed by filling the sealing material 9 in two upper and lower portions of a wedge-shaped gap formed between the upper portion of the water-stopping material 6 and the lower surface of the precast floor slab 4 above it. Therefore, as shown in FIG. 4, as a comparison, in a place where water leakage has occurred in the water-stopping material 3 having a rectangular cross section as used in the prior art, the main girder 2 and the precast are applied to the water-stopping material 3 in a later process. It has been necessary to perform sealing by filling the sealing material 9 over the entire surface in the vertical direction from the side on which the concrete 5 for fixing the floor slab 4 is placed, that is, from the center in the width direction of each main girder 2. In contrast, according to the tube-type water-stopping material 6, it becomes possible to stop water more easily with a small amount of the sealing material 9.

  Moreover, the tube-type waterstop material 6 is made to adhere to the upper surface of the main girder 2 and the lower surface of the precast floor slab 4 by injecting air and expanding it from the flat state in the vertical direction. As shown in (a), when the distance between the main girder 2 and the precast floor slab 4 is wide, or when the distance between the main girder 2 and the precast floor slab 4 is narrow as shown in FIG. It is possible to cope with this case. Since the air injected into the tube body 7 is air, the tube-type waterstop 6 is expanded between the main girder 2 and the precast floor slab 4 and then the main girder 2 and the precast floor. Even if the distance from the plate 4 changes somewhat, the height dimension of the tube-type water-stopping material 6 can be changed like a spring, and the water-stopping function can be maintained. In addition, when the distance between the main girder 2 and the precast plate 4 becomes wide and the adhesiveness of the tubular water-stopping material 6 to the upper surface of the main girder 2 and the lower surface of the precast plate 4 decreases, the additional injection of air It becomes possible to easily recover the adhesion. Therefore, after the precast floor slab 4 is placed on the upper side of the main girder 2, the precast floor slab 4 is placed on the main girder 2 in order to adjust the installation height of the existing structure or the precast floor slab 4. When adopting a structure that changes the height, use a tube-type waterstop material 6 whose diameter when expanded is the size corresponding to the maximum height of the precast floor slab 4 placed on the main girder 2. Thus, it becomes possible to change the height dimension when the tubular waterstop 6 is expanded from the flat state in the vertical direction by following the change in the height of the precast floor slab 4 on the main girder 2. . Thereby, even when the method of changing the height of the precast floor slab 4 above the main girder 2 is carried out, soundness when filling the concrete 6 between the main girder 2 and the precast floor slab 4 is achieved. Can be obtained.

  Furthermore, when the construction method of changing the height of the precast floor slab 4 above the main girder 2 as described above is performed, the tube-type waterstop 6 is attached to the upper surface of the main girder 2 and then the main girder 2 is installed. Instead of the method of placing the precast floor slab 4 on the upper side of the girder 2, the precast floor slab 4 is placed on the upper side of the main girder 2 via a mechanism that supports the precast floor slab 4 so that it can be displaced in the vertical direction. The tube-type water-stopping material 6 that has been placed and then evacuated to a flat state is placed on the upper surface of the main girder 2 through a gap formed between the main girder 2 and the precast floor slab 4. It arrange | positions between the width direction both ends edge, and the lower surface of the precast floor slab 4, and after that, by injecting air into the tube body 7 from the air injection valve 8, this tube-type water stop material 6 is made into the said main girder. 2 adheres to both the upper surface of the plate and the lower surface of the precast slab 4 It is also possible to exert the water stop function Te.

  In addition, this invention is not limited only to the said embodiment, You may change suitably the diameter dimension at the time of expansion | swelling of the tube body 7, and thickness.

  The air injection valve 8 can hold the air in the tube body 7 in a state where the air is removed from the tube body 7 until the tube water stop material 6 is expanded so as to exhibit the water stop function, and the tube body passes through the air injection valve 8. 7 is equipped with a check valve function that prevents the outflow of air from the inside to the outside in a state where pressurized air of the required pressure is injected, it is specified in an automobile tire valve specified in JIS D4207 or in JIS D9422. Any type of air injection valve other than a bicycle tire valve may be used. Moreover, you may change suitably the installation position of the air injection valve 8 in the longitudinal direction of the tube-type water stop material 6. FIG.

  As the material of the tube body 7, any material other than the material similar to the bicycle tire tube defined in JISK6304 is adopted as long as it is flexible and can withstand the pressure of air injected into the tube body 7. May be.

  The tube-type water blocking material 6 may be fixed to the lower surface of the precast floor slab 4 with a double-sided tape or a sealing material (not shown) at the upper end portion of the tube body 7 when air is injected and expanded. .

  As long as the concrete 5 is placed between the main girder 2 and the precast floor slab 4 until the concrete 5 is hardened, if it is a place where temporary water stop is desired between the two members, Needless to say, the present invention can be applied to water stopping at any location, and various modifications can be made without departing from the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a tube-type water-stopping material of the present invention, in which (A) is a schematic perspective view, and (B) is a view in the direction of arrows A-A in (A). It is a figure for demonstrating the water stop method by the tube type water stop material of FIG. 1, (A) is the state which attached the tube type water stop material of the flat state to the required part above the main girder, (B) is The state in which the tubular water-stopping material is expanded between the main girder and the precast floor slab, (c) is the state in which the adjacent ends of the tubular water-stopping materials arranged in series are water-stopped and fixed. (D) is a schematic diagram showing a state in which a portion where water leakage has occurred in the tubular water-stopping material is sealed. This shows the behavior of the tubular water-stop material when the distance between the main girder and the precast slab changes. (A) shows the case where the distance between the main girder and the precast slab increases, and (b) shows the main It is a schematic diagram which respectively shows the case where the space | interval of a girder and a precast floor slab becomes narrow. It is a schematic diagram which shows the state which seals the location which the water leak produced in the water stop material of the rectangular cross-sectional shape used conventionally. It is a schematic perspective view which shows the fixation structure of the conventional main girder and a precast floor slab.

Explanation of symbols

2 Main girder (member)
4 Precast floor slab (components)
6 Tube type water stop material 7 Tube body 8 Air injection valve

Claims (3)

  A tube-type water-stopping material provided with an air injection valve at a required portion of a tube body that extends in a straight line and has both ends in the longitudinal direction closed and is normally flat. Arranged so as to extend in the longitudinal direction, the central portion in the width direction of the lower surface of the flat tube-shaped water-stopping material is affixed to the upper surface of the member, and then another member that desires water-stopping on the member, After mounting from above the tube-type water-stopping material, the tube-type water-stop material is expanded, and the tube-type water-stop material is brought into close contact with the upper member so as to stop water between two members that desire water-stop. A water stop method using a tube type water stop material. Two members that want to stop water are precast floor slabs that are placed on the main girder and the upper side of the main girder. A water stopping method using the tube type water stopping material according to claim 1 . The tube-type water-stopping material is expanded so that the outer shape of the cross-sectional shape becomes a round shape by injecting air from a flat state, so that the water-stopping between two members that desire water-stopping is stopped. The water-stopping method using the tube-type water-stopping material according to 2.

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