JP6026299B2 - Single pipe pipe pedestal and water stop material for scaffolding - Google Patents

Description

  The present invention relates to a single-pipe pipe pedestal and water-stopping material for scaffold used for water-stopping of a concrete joint, and more specifically, a mortar or the like that fills a gap from which a single-pipe pipe for scaffolding that occurs when placing pressure resistant concrete is removed The present invention relates to a single-pipe pipe pedestal and water-stopping material for scaffolds used in joints with pressure-resistant concrete.

  After constructing a scaffold for work by assembling a single pipe for scaffolding in general construction, pressure-resistant concrete is placed on the construction ground (also called construction surface) including this scaffold. When the scaffold is dismantled, a portion where the single pipe for scaffolding is removed becomes a void, and mortar or the like is filled therein to fill the void. However, since a joint portion is formed between the mortar and the pressure resistant concrete, and groundwater penetrates into the pressure resistant concrete through this portion, a water-stopping material that blocks this penetration is laid.

  Conventionally, the following are known as a water stop material with respect to this concrete joint part. Specifically, (1) An organic material having a water-swelling function by mixing a resin or rubber with a resin or rubber, and exhibiting a water-stopping performance utilizing the contact stress due to the expansion pressure of the swelling function Water-stopping material obtained by molding a water-swellable composition (for example, Patent Document 1), (2) Water-stopping clay powder or granular material such as bentonite and smectite filled or sandwiched in cardboard or non-woven fabric Panel or water stop rope, (3) Inorganic water-swellable water stop material kneaded with an adhesive composition using water-swellable clay and gelled base oil or asphalt (for example, Patent Document 2), (4) A base made of metal with a height matching the thickness of the pressure-resistant concrete is installed, and is buried when the pressure-resistant concrete is placed to prevent the generation of voids due to the single pipe pipe for scaffolding, and the water transmitted through the interface with the foundation is Installed in There is such as water stop plate for the water stopping by.

  Among these water-stopping materials, the above-mentioned water-stopping material (1), (2) water-stopping panel and water-stopping rope, and (3) inorganic water-swellable water-stopping material are usually single pipes for scaffolds. The voids are filled as a molded body that has been formed into a shape that matches the shape of the voids that are generated by pulling out the. However, since the voids can have various sizes, it is necessary to prepare many types of water-stopping materials that match the size of the voids. In addition, it is conceivable to form the water-stopping material of (1) and (3) the inorganic water-swellable water-stopping material into a sheet shape and dispose it below the single pipe for scaffolding. Since the water-swellable water-stopping material is plastic, it is not desirable as a member for supporting a single pipe for scaffolding. The water stop plate of (4) mentioned above is a water stop plate embedded in the base in the first place and does not fill the gap, but the structure becomes complicated as the base, and the water leakage path of the concrete joint is simply prolonged. It ’s just a complicated one.

Japanese Patent Laid-Open No. 3-187408 JP 2003-213260 A

  The present invention has been made in view of the conventional technology as described above, and can cope with various gaps with one type of fixed water-stopping material. An object of the present invention is to provide a single pipe pipe pedestal and water-stopping material for scaffolding that is excellent in workability as a water-stopping material for concrete joints and that also exhibits high water-stopping performance.

The object of the present invention has been achieved by the following means.
(1) A single-pipe pipe pedestal and water-stopping material for scaffolds made of a water-swellable material, the plate-like body interposed between concrete and the construction surface of the concrete, and the surface of the plate-like body And a protrusion having an inclined surface that is inclined with respect to the surface thereof.
(2) On the surface of the plate-like main body, a pipe receiving portion and a concrete receiving portion are arranged outside the outer peripheral edge of the protruding portion. Water material.
(3) The single pipe pipe pedestal and water-stopping material for scaffolds according to (1) or (2), wherein the protruding portion has a cone shape, a frustum shape, a hemispherical shape, or a semi-elliptical spherical shape.
(4) The single pipe pipe pedestal and water stop for a scaffold according to any one of (1) to (3), wherein the protrusion has a maximum outer diameter of 10 mm or more and a height of 10 mm or more. Wood.
(5) The single-pipe pipe pedestal and water stop for a scaffold according to any one of (1) to (4), wherein a width from an edge of the protrusion to an edge of the plate-like body is 10 to 200 mm. Wood.
(6) The water-swellable material is a porous water-swellable elastic material obtained by vulcanizing a water-swellable composition containing rubber and water-swellable clay. The single pipe pipe pedestal and water stop material for scaffolds according to item 1.

  The single-pipe pipe pedestal and water-stopping material for scaffolds according to the present invention can be used even when the gaps generated after the single-pipe pipe for scaffolds is pulled out are various sizes, and exhibit high water-stopping performance. Further, the single pipe pipe pedestal and water-stopping material for scaffold of the present invention can be installed as a scaffold pedestal when assembling the scaffold and can be easily constructed because it does not require fixing using an adhesive and a nail. . Furthermore, the single pipe pipe pedestal and water-stopping material for scaffolding of the present invention can fix and support the single pipe pipe for scaffolding even when the construction surface is inclined.

More specifically, the present invention relates to a single pipe pipe pedestal and water stop material for scaffolds made of a water-swellable material, and an inclined surface that inclines from the surface of the plate-like body and the plate-like body to the surface. With the structure including the protruding portion having the structure, the protruding portion is inserted into the inner hole of the single tube pipe during the scaffold assembly work, and the end surface of the single tube pipe is received by the pipe receiving portion before placing the pressure resistant concrete. It can be buried in the construction site in advance. Such a construction method can be easily carried out even if the construction surface is horizontal as well as inclined. And since the constructed single pipe pipe pedestal and water-stopping material for scaffolding is buried in the joint part with primary concrete such as pressure-resistant concrete (sometimes called simply concrete), when the single pipe pipe for scaffolding is pulled out Exhibits high water-stopping performance without being affected by the size of the generated gap. Therefore, it is not necessary to prepare water-stopping materials of various sizes in advance, and if one single pipe pipe pedestal and water-stopping material for scaffolding is prepared, various gaps can be handled.
In addition, if the single pipe pipe pedestal and water-stopping material for scaffolding is buried in the joint part as described above, the projection part becomes an obstacle even when the single pipe pipe for scaffolding floats before placing the primary concrete. Thus, the single pipe pipe pedestal and water-stopping material for scaffolding does not come off from the joint part and the construction location, and the stability of the single pipe pipe for scaffolding after construction is excellent. Moreover, it is hard to produce the floating between the water stop materials which primary concrete flows in into the single pipe pipe for scaffolds, As a result, high water stop performance can be maintained.
Furthermore, by making the shape of the projecting portion into a shape having an inclined surface, for example, a cone shape, a truncated cone shape, a hemispherical shape or a semi-elliptical spherical shape, the projecting portion may be inclined even when the construction surface is inclined. The inner hole of the single pipe for scaffolding can be inserted without difficulty. Therefore, the single pipe pipe pedestal and water stop material for scaffolding does not come off from the joint part. Moreover, the inflow of the primary concrete into the single pipe for scaffolding can be prevented, and the water stop performance can be prevented from deteriorating.

FIG. 1 is a plan view (a) and a cross-sectional view (b) showing an embodiment of a single pipe pipe pedestal and water-stopping material for a scaffold according to the present invention. FIG. 2 is a cross-sectional view showing another embodiment of the single pipe pipe pedestal and waterstop material for scaffolds of the present invention. FIG. 3 is a cross-sectional view showing still another embodiment of the single pipe pipe pedestal and waterstop material for scaffolds of the present invention. FIG. 4 is a cross-sectional view showing still another embodiment of the single pipe pipe pedestal and waterstop material for scaffolds of the present invention. FIG. 5 (a) is a cross-sectional view showing a state in which the single pipe pipe for scaffolding and primary concrete are placed on the single pipe pipe pedestal and water-stopping material for scaffold according to the present invention, and FIG. It is sectional drawing which shows the state which filled the secondary concrete into the space | gap produced by extracting the single pipe for scaffolding from the state shown to 5 (a). FIG. 6 is a schematic view of an apparatus for performing a water stop performance confirmation test.

  Hereinafter, preferred embodiments of the present invention will be described. 1 to 4 show a preferred embodiment of the single pipe pipe pedestal and waterstop material for scaffolds of the present invention. A single pipe pipe pedestal and water-stopping material 1 for scaffolding in FIG. 1 has a disk-like plate-like main body 5 and a truncated cone-like projection 6. The single pipe pipe pedestal / waterproofing material 1A for scaffolding in FIG. 2 and the single pipe pipe pedestal / waterproofing material 1B for scaffolding in FIG. 3 are both shown in FIG. This is basically the same as the single pipe pipe pedestal and water-stopping material 1 for scaffolding. The single pipe pipe pedestal / waterproofing material 2 for scaffolding in FIG. 4 (a) has a disc-like plate-like main body 5 and a conical protrusion 6A, except that the shape of the protrusion 6A is different. This is basically the same as the single pipe pipe pedestal and water-stopping material 1 for scaffolding. The single-pipe pipe pedestal / waterproofing material 3 for scaffolding in FIG. 4 (b) has a disc-like plate-like main body 5 and a conical projection 6B, except that the shape of the projection 6B is different. This is basically the same as the single pipe pipe pedestal and water-stopping material 1 for scaffolding. Accordingly, the single-pipe pipe pedestal / waterproofing material 1A for scaffolding in FIG. 2, the single-pipe pipe pedestal / waterproofing material 1B for scaffolding in FIG. 3, and the single-pipe pipe pedestal / waterproofing material 2 for scaffolding in FIG. The description of the common part as the water stop material of the single pipe pipe pedestal and water stop material 3 for scaffolding in FIG. An embodiment of the present invention will be described below with reference to the drawings.

  A single pipe pipe pedestal and water-stopping material for scaffolding (hereinafter sometimes referred to simply as a water-stopping material) 1 of a preferred embodiment forms a pedestal for a single pipe pipe for scaffolding and removes the single pipe pipe for scaffolding. This is a water-stopping material used for water-stopping of the voids, and is made of a water-swellable material described later. As shown in FIG. 1, the water blocking material 1 includes a plate-like main body 5 and a protrusion 6 having an inclined surface that is inclined with respect to the surface of the plate-like main body 5.

  The surface 5A of the plate-like main body 5 supports the protruding portion 6 alone or together with a washer described later, and the single pipe pipe 63 for scaffolding and the primary concrete 14 are placed to stop the joint portion. The back surface 5B of the plate-like main body 5 is flat and abuts the construction surface. More specifically, as shown in FIGS. 1 (a) and 5 (a), a pipe receiving portion 51 and the pipe receiving portion are disposed outside an outer peripheral edge (also referred to as a base portion) 61 of the protruding portion 6. A concrete receiving portion 52 is provided outside the portion 51. The pipe receiving part 51 supports the end surface of the single pipe 63 for scaffolds. At that time, the protrusion 6 is inserted into the inner hole of the single pipe 63 for scaffolding to support the pipe 63 from the inside. The pipe receiving portion 51 becomes a part of the secondary concrete receiving portion when the scaffolding single pipe 63 is extracted and filled with the secondary concrete 16. The primary concrete 14 is placed upward from the concrete receiving portion 52 outside the pipe receiving portion 51. In this manner, the water-stopping material 1 is pressed from above by the scaffolding single pipe 63 and the primary concrete 14, and the waterstopping material 1 is always fixed below the scaffolding single-pipe pipe 63. Therefore, it is not necessary to fix the water stop material 1 as a pedestal using an adhesive or a nail.

  On the other hand, in the pipe receiving part 51 and the projection part 6, the single pipe 63 for scaffolding is finally extracted and filled with secondary concrete such as mortar. At this time, as shown in FIG. 5B, a joint portion 62 is generated between the primary concrete 14 and the secondary concrete 16. The joining portion 62 is generated along the height direction of the primary concrete 14 from the vicinity of the edge 51 </ b> A of the pipe receiving portion 51. The joint portion 62 is not in contact with the construction surface, and the water leakage path is blocked by the water-swellable water-stopping material 1. Further, the joint portion 62 is inward of the edge 5C of the plate-like main body 5. Therefore, the water that travels from the back surface 5B side to the edge 5C of the plate-like main body 5 is swollen by the water before the plate-like main body 5 reaches the joint portion 62 through the back surface 5B, the edge 5C, and the front surface 5A. The water is absorbed and water leakage is blocked. Further, the water leakage path itself from the end of the end edge 5C is also blocked by the water swelling of the plate-like main body 5.

The pipe receiving portion 51 and the concrete receiving portion 52 are generally annular in plan view, but may have other shapes depending on the end surface shape of the single pipe pipe 63 for scaffolding, the shape of the joining portion, and the like. . Needless to say, the end edge 51 </ b> A of the pipe receiving portion 51 varies depending on the dimensions of the single pipe 63 for scaffolding and the joining portion 62.
The pipe receiving portion 51 may be formed of a ring-shaped metal plate disposed on the surface 5A of the plate-like member 5. That is, the water blocking material 1 has a ring-shaped metal plate as a pipe receiving portion on the surface 5A of the plate-like main body 5 and outward of the outer peripheral edge of the protruding portion 6. Thus, when the pipe receiving part is formed of a metal plate, the plate body 5 having high hardness is reinforced, and deformation and breakage due to a load applied to a portion where the end face of the single pipe for contact is in contact is highly suppressed. It is possible and preferable.
Moreover, it is preferable that at least a part of the front surface 5A and / or the back surface 5B of the plate-like main body 5 has an uneven shape, for example, an uneven shape formed by combining grooves or filaments. An example of such a concavo-convex shape is a concavo-convex structure in which filaments are arranged in a mesh pattern. Thus, if the surface 5A or the back surface 5B of the plate-like main body 5 has an uneven structure, the strength of the plate-like main body 5 can be reinforced.

  In the water blocking material 1, when the pipe receiving portion 51 is set lower than the concrete receiving portion 52, the single pipe 63 for a scaffold or the void tube is easily adhered to the pipe receiving portion 51. Thereby, the installation position of the single pipe 63 for scaffolds can be further stabilized, and the water stop performance can be further improved, which is preferable.

The plate-like main body 5 only needs to have a shape and a dimension in which the end surface of the single pipe for scaffolding and the primary concrete can be placed or placed. The planar shape of the plate-like main body 5 can include a circular shape, an elliptical shape, a polygonal shape, an indeterminate shape, etc., depending on the end face shape of the single pipe pipe for scaffolding, the shape of the joint portion or the construction location, etc. Is set. In the water blocking material 1 shown in FIG. 1, the plate-like main body 5 is formed in a disc shape.
Although the dimension of the plate-shaped main body 5 is not specifically limited, The external dimension must be larger than the single pipe pipe for scaffolds to be used, and / or the void pipe in the case of edge-cutting using a void pipe. In addition, the width H1 (see FIG. 1) from the base portion 61 of the projecting portion 6 to the edge 5C of the plate-like main body 5 may be a width that allows the joint portion 62 to be sufficiently inward. 200 mm is preferable and 20-100 mm is more preferable. The width H1 is the smallest width from the base portion 61 to the edge 5C. When the width H1 is larger than 200 mm, there is a possibility that the adjacent plate-like main bodies 5 of the single pipe pipe pedestal and water stop material for scaffolding overlap each other. On the other hand, when the width H1 is smaller than 10 mm, the water stop effect is lost due to a minute shift, and therefore, labor for construction management such as when placing secondary concrete is required. In the waterstop material 1, it is particularly preferable that the distance between the outer periphery of the scaffolding single pipe or void pipe and the edge 5C of the plate-like body 5 is greater than 5 mm. When the plate-like main body 5 has such dimensions, the surface area for exhibiting the water stop performance at the joint portion is large, and sufficient water stop performance is exhibited. The external dimension of the plate-like main body 5 is set to 60 to 500 mm, for example. Here, the outer dimension of the plate-shaped main body 5 is the outer diameter when the plate-shaped main body 5 is disk-shaped, and is the diameter of the circumscribed circle when it is other than that. The thickness of the plate-like main body 5 is not particularly limited, but can be set to 2 to 15 mm in that damage due to the end face of the single pipe for scaffolding can be prevented.

  The plate-like main body 5 has a hardness capable of supporting a single pipe for scaffolding. Specifically, the hardness by a C-type hardness meter is preferably 71 or more, and preferably 71 or more and less than 80. Particularly preferred. When the plate-like main body 5 has such hardness, even if the scaffolding single pipe is placed, the plate-like main body 5 supports the scaffold single pipe without being greatly crushed. The water stop effect can be demonstrated. In particular, when the metal plate is used as the pipe receiving portion, or when the surface 5A and / or the back surface 5B has an uneven structure, the apparent hardness of the water-stopping material 1 is increased, and the initial water-stopping effect is obtained. Can be fully demonstrated. Here, the hardness of the plate-like main body 5 is a value measured under the condition of a temperature of 23 ± 3 ° C. using a C-type hardness meter (for example, RUBBER HARDNESS TESTER, manufactured by Furusato Seiki Seisakusho).

The protrusion 6 may be a tapered shape having an inclined surface inclined from the surface 5A of the plate-like main body 5 to the surface 5A. For example, the protrusion 6 has a cone shape, an elliptical cone shape, a polygonal cone shape (for example, A pyramid shape such as a triangular pyramid shape, a quadrangular pyramid shape, a pentagonal pyramid shape, a truncated cone shape, an elliptical truncated cone shape, a polygonal truncated pyramid shape (for example, a triangular truncated cone shape, a truncated pyramid shape, a pentagonal pyramid shape) Shape), a hemispherical shape or a semi-elliptical spherical shape. In the water-stopping material 1 shown in FIG. 1, the protrusion 6 is formed in a truncated cone shape, and in the water-stopping material 2 shown in FIG. 4 (a), the protrusion 6A is formed in a conical shape, as shown in FIG. 4 (b). In the water material 3, the protrusion 6B is formed in a hemispherical shape.
The protrusions 6, 6 </ b> A, and 6 b (in the present specification, these may be collectively referred to as the protrusion 6) support the single pipe for scaffolding from the inside, so that the single pipe for scaffolding is the surface of the plate-like body 5. Even when floating from 5A, the projection 6 that has entered the inner hole does not become a hindrance and the single pipe pipe pedestal and water-stopping material 1 for scaffolding does not come off the construction site. Moreover, since the projection part 6 has the above-mentioned tapered shape, the projection part 6 can be inserted into the single pipe for scaffolding without difficulty. In addition, even when a gap is created between the inner wall of the single pipe for scaffolding and the protrusion 6 and the construction surface is inclined, strong force is applied to the contact portion between the end face of the single pipe for scaffolding and the plate-like body 5. Will not be applied. As a result, the single pipe for scaffolding can be easily installed perpendicularly to the horizontal plane and stabilized on the inclined construction surface as well as the horizontal construction surface. In addition, since at least the periphery of the base portion 61 or the inclined surface of the protrusion 6 can be in close contact with the inner wall of the single pipe for scaffolding, a gap for the entrance of concrete hardly occurs. Furthermore, due to this close contact, the single pipe pipe for scaffolding which becomes a scaffold and the water stop material are integrated, and the installation position can be easily adjusted and the workability is excellent. On the other hand, when the protrusion 6 is formed in a rectangular parallelepiped or a cylinder, the protrusion is brought into contact with the inner wall of the single pipe for scaffolding when a construction surface is inclined, and a force is applied. Due to this force, the projecting portion may be peeled off from the plate-like main body 5 and the stability of the single pipe for scaffolding and the stability as the scaffolding may be impaired. Furthermore, when the construction surface is steeply inclined, it becomes difficult to insert it into the single pipe for scaffolding. The water-stopping material 1 of the present invention can solve such a problem, stabilize the single pipe for a scaffold, and appropriately install a safe scaffold.

  Each of the protrusions 6, 6A and 6B is formed as a solid as shown in FIG. 1, but may have a tip 7 or a hole 7 opened at the tip surface as shown in FIG. As shown in FIG. 3, it may have a hole 8 opened on the back surface of the plate-shaped main body, and may further provide an internal space. The holes 7, 8 and the internal space are set to appropriate shapes and dimensions as long as the protrusions 6 can maintain the shape. These holes 7 and 8 have an effect that stress can be relaxed by easily deforming the protrusion even if the protrusion contacts the single pipe for scaffolding, and construction can be performed without any problem.

  At least part of the inclined surface of the protrusion 6 may have an uneven shape. This uneven shape may have basically the same structure as the uneven shape of the plate-like main body 5 or may have a different structure. If the inclined surface 6 of the protrusion 6 has a concavo-convex structure, the hardness of the protrusion 6 is increased, and the resistance when the single pipe for scaffolding is misaligned becomes more stable. An effect is obtained.

  The dimension of this projection part 6 should just be a dimension which can be arrange | positioned in the inner hole of the single pipe for scaffolding, and is set suitably according to the internal diameter of an inner hole. For example, the outer diameter of the outer peripheral edge 61 of the protrusion 6, that is, the maximum outer diameter of the protrusion 6 is determined according to the inner hole of the single pipe for scaffolding. , Preferably 20 mm or more, more preferably 35 mm or more, preferably less than the inner diameter of the inner hole, more preferably 5 mm smaller than the inner diameter of the inner hole. Here, the outer diameter and the maximum outer diameter are the outer diameter when the cross section of the protrusion 6 is circular, and the outer diameter is the diameter of the circumscribed circle when the cross section is other than that.

  The protrusion 6 can be made easy to insert a pipe even when it is constructed on a steeply inclined surface by reducing its height. However, since the depth to which it is inserted becomes shallow, the water-stopping material may be easily detached from the single pipe for scaffolding. Therefore, the height of the protrusion 6 from the surface of the plate-like main body 5 is preferably 5 mm or more, more preferably 15 mm or more. The upper limit of the height is not particularly limited, but is 50 mm, for example. The inclination degree θ of the inclined surface with respect to the surface of the plate-like main body 5 is an outer angle of the inclined surface with respect to the horizontal line in the cross-sectional shape of the protrusion 6 and is an obtuse angle with respect to the surface as shown in FIG. Is preferred and is determined by the maximum outer diameter and height. For example, the inclination θ is preferably more than 90 ° and not more than 150 °. The protrusion 6 has basically the same hardness as the plate-like body 5.

  The single-pipe pipe pedestal and water-stopping material for scaffold of the present invention is formed of a water-swellable material. The water-swellable material is not limited, but a material having water-swellability and a predetermined hardness is preferably used. As such a water-swellable material, rubber, water-swellable clay, vulcanizing agent, and a desired material can be used in order to support the single pipe 63 for scaffolding without damaging the pipe receiving portion 51 and exhibit high water-stopping properties. Thus, a water-swellable material obtained by vulcanizing a water-swellable composition containing various additives, particularly a porous water-swellable elastic material is preferred.

As the rubber and the water-swellable clay in the water-swellable composition to be a water-swellable material, various rubbers and water-swellable clays can be used without particular limitation. Examples of rubber include natural rubber, butyl rubber, chloroprene rubber, styrene / butadiene rubber, butadiene rubber, acrylonitrile / butadiene rubber, acrylic rubber, isobutylene rubber, isoprene rubber, ethylene propylene rubber, polyethylene, chlorinated polyethylene, sulfonated polyethylene, Chlorinated polypropylene, sulfonated polypropylene, ethylene / vinyl acetate copolymer, polyvinyl chloride or copolymer thereof, urethane rubber, fluoro rubber, silicon rubber, styrene / isoprene / styrene block copolymer or hydrogenated product thereof, styrene -Many things such as an isoprene copolymer or a hydrogenated product thereof, a styrene / butadiene block copolymer or a hydrogenated product thereof, a styrene / butadiene / styrene block copolymer or a hydrogenated product thereof. This rubber can use 1 type (s) or 2 or more types.
As the water-swellable clay, at least one water-swellable clay selected from natural or synthetic water-swellable clay is used. Such clay may be unmodified or modified, but is preferably at least one selected from smectite clays such as bentonite and hectorite, and swelling mica. Among these, bentonite is an inorganic clay produced naturally, so it is safe and stable for a long time without being decomposed by microorganisms in the soil. Therefore, it is a particularly preferable clay. This water-swellable clay can be used alone or in combination of two or more. In this water-swellable composition, the water-swellable clay is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, and further preferably 40 to 65% by mass with respect to 100% by mass in total with the rubber. is there.
As the vulcanizing agent, a vulcanizing agent used for vulcanizing various rubbers can be used without particular limitation. Examples of the various additives include additives usually used in rubber compositions.

  Further, as the porous water-swellable elastic material, the above-described water-swellable composition containing rubber, water-swellable clay, vulcanizing agent, and various additives as required is vulcanized. A material having a porosity of 1% or more and a C-type hardness of 71 or more and less than 80 can be used. In this water-swellable composition, the range of 3 μm or more and 2 cm or less with respect to the area circle equivalent diameter distribution is set as the appropriate area circle equivalent diameter, and the ratio of the pores having this appropriate area circle equivalent diameter to the total number of pores It is preferably present at 60% or more, and the swelling rate is preferably 150% or more. This porous water-swellable elastic material exhibits excellent swellability and shape stability, as will be described later, by virtue of the above-described properties functioning together.

Since this porous water-swellable elastic material exhibits a good balance between swelling and shape stability due to the presence of fine pores, the porous water-swellable elastic material is preferably used as a single-pipe pipe pedestal and water-stopping material for scaffolds of the present invention.
This porous water-swellable elastic material has a plurality of pores. As described above, when the porous water-swellable elastic material has the above-described voids therein, the water-swellable function is maintained and excellent shape stability is exhibited. Here, the “hole” is a void portion existing inside the porous water-swellable elastic material, and includes both independent holes and continuous holes. “Independent pores” refers to those which are not communicated with the outside of the porous water-swellable elastic material and are encapsulated. “Continuous hole” refers to a hole that is continuous from an arbitrary surface of a porous water-swellable elastic material to another surface in a passage shape, or a hole that is bent and communicates from one surface to the other surface.

  Each of the plurality of pores has an appropriate area equivalent circle diameter, and from the viewpoint of swelling and shape stability, the ratio of the appropriate equivalent area equivalent diameter is preferably 60% or more, and more than 80%. More preferably. A porous water-swellable elastic material having an appropriate area equivalent circle diameter of 60% or more is preferable in that it exhibits high swellability and is excellent in shape stability and strong. The range of the appropriate area equivalent circle diameter is more preferably 20 μm or more and 1 cm or less, and further preferably 50 μm or more and 5 mm or less, in that further excellent swelling and shape stability are exhibited. Here, the area equivalent circle diameter of the hole means a diameter (converted value) when the void is regarded as a perfect circle from the area of the hole observed on the cut surface to be observed.

  The ratio of the equivalent area circle equivalent diameter can be obtained as follows. That is, a cross section of the porous water-swellable elastic material cut with a cutter knife is observed with a microscope (manufactured by Keyence Corporation, VHX-2000) at a magnification of 150 times. While counting the number of holes in the field of view, the area of each hole is calculated by the measurement software installed in the microscope, and the diameter when assuming a circle: the equivalent diameter of the area circle is calculated from the area. The number of holes whose area circle equivalent diameter calculated in this way is 3 μm or more and 2 cm or less is counted and divided by the total number of holes. In this manner, the ratio of holes having an area equivalent circle diameter of 3 μm or more and 2 cm or less is obtained. This ratio is the average ratio of the three cut surfaces.

  The ratio of the area equivalent circle diameter and the appropriate area equivalent circle diameter of the pores can be adjusted by the amount of water in the water-swellable clay, the amount of foaming agent, and the like. For example, the ratio of the area equivalent circle diameter and the surface appropriate area equivalent circle diameter tends to increase as the amount of water in the water-swellable clay increases. Specifically, the amount of water in the water-swellable clay is 8 to 8%. It can adjust to the above-mentioned range as it is 15 mass%.

  In the porous water-swellable elastic material, the porosity is preferably 1% or more from the viewpoint of excellent swellability. The upper limit of the porosity is not particularly limited. However, if the porosity is higher than 40%, the shape stability of the molded product may be deteriorated. Therefore, the porosity is preferably 40% or less. The porosity is more preferably from 3 to 35%, and even more preferably from 5 to 30%, from the viewpoint that both swellability and shape stability can be achieved.

  The porosity can be adjusted, for example, by foaming of water in the water-swellable clay. Moreover, it can also adjust using sodium hydrogencarbonate etc. which are thermally decomposed and generate | occur | produce a carbon dioxide gas etc. by the heating at the time of vulcanization | cure. In addition to these methods, as a method of adjusting the porosity, a method of vulcanizing after forming pores in the water-swellable composition before vulcanization by the above method, a method of mixing a highly volatile solvent and vacancy. A method of providing pores, a method of providing pores by mixing liquefied gas, a method of mixing materials dissolved in a solvent, immersing in the solvent after vulcanization, and a method of eluting the materials, etc. Can be mentioned. For example, the porosity tends to increase when the amount of water in the water-swellable clay is increased, and specifically, the amount of water in the water-swellable clay is 8 to 15% by mass within the above range. Can be adjusted.

The porosity can be determined as follows. That is, a cross section of the porous water-swellable elastic material cut with a cutter knife is observed with a microscope (manufactured by Keyence, VHX-2000). Specifically, the magnification of the microscope is fixed at 150 times, the total area B of the voids in the visual field occupying the total visual field area A (3757622 μm ² ) is measured, and the total area B / It is calculated from the total visual field area A × 100 (%). In addition, the measurement software introduced into this microscope is used for the total visual field area A and the area of holes in the visual field. Thus, it measures 3 times and makes the average of the measured numerical value a porosity.

  The porous water-swellable elastic material preferably has a hardness (C-type hardness meter) in the above-mentioned range and has surface tackiness. When the hardness (C-type hardness meter) is in the above range, the swelling rate described later can be adjusted within the range described later, and even when the load is applied for a long time, it is difficult to be deformed and broken, and swellability and shape stability. Can be balanced. The hardness (C-type altimeter) is preferably 72 or more and 79 or less, and more preferably 73 or more and 78 or less, in that the swelling property and shape stability can be further improved. The hardness (C-type hardness meter) of the porous water-swellable elastic material can be measured using a C-type hardness meter (RUBBER HARDNESS TESTER, manufactured by Furusato Seiki Seisakusho Co., Ltd.) at a temperature of 23 ± 3 ° C. . If this porous water-swellable elastic material is provided with an adhesive layer having surface adhesiveness on the surface after curing, the porous water-swellable elastic material adheres to the end face of the single pipe for scaffolding and can prevent displacement.

  The hardness (C-type hardness meter) can be adjusted by the water content, blending, vulcanization temperature, porosity, etc. in the water-swellable clay. For example, the hardness tends to increase when the amount of water in the water-swellable clay is reduced. Specifically, the hardness can be adjusted to the above range when the amount of water in the water-swellable clay is 8 to 15% by mass. . In this water-swellable material, a reinforcing material such as a nylon thread may be included in the water-stopping material in order to reinforce the molded body after molding.

  The porous water-swellable elastic material preferably has a swelling ratio of 150% or more, preferably 150 to 1000%, and more preferably 200 to 600%. The swelling rate is a numerical value indicating the swelling performance of the porous water-swellable elastic material, and is a volume ratio obtained by a measurement method described later. If the swelling rate is too small, a sufficient water stop effect may not be obtained, and if it is too large, cracks may occur. In particular, it is preferable that the swelling rate after one month is within the above-mentioned range when used as a water-stopping material for a single pipe for a scaffold made of a water-swellable composition. In this case, the porous water-swellable elastic material absorbs moisture and has a high water-stopping effect. On the other hand, rapid swelling of the entire material is suppressed, and the swellability can be maintained for a long time. Such long-term swelling performance can be obtained by a combination of the above-described numerical ranges of porosity and C-type hardness. The swelling rate after one month was measured based on the following measurement method after each porous water-swellable elastic material was stored at 23 ± 2 ° C. while completely immersed in water for one month. Is.

The swelling rate is calculated as follows. That is, the mass (W1) in the air (temperature 23 ± 2 ° C., relative humidity 40 ± 10%) before soaking the water-swellable composition after molding is measured, and the mass (W2) in water at 23 ± 2 ° C. is measured. ). Next, after immersing in water, quickly remove it, wipe it lightly with filter paper to remove moisture, measure the mass of the test piece in air (W3), and further measure the mass in water (23 ± 2 ° C) (W4) Weigh. From the masses thus measured (W1 to W4), based on the following formula of the volume change rate of the method described in “JIS K 6301 immersion test”, the formula: {(W3−W4) − (W1−W2) )} ÷ (W1-W2) × 100 (%) can be calculated by converting the specific gravity difference into a volume.
The swelling rate can be adjusted by the amount of water in the water-swellable clay, the amount of water-swellable clay during blending, the hardness, the area equivalent circle diameter, and the like. For example, the swelling rate tends to increase when the amount of water in the water-swellable clay is increased. Specifically, the amount of water in the water-swellable clay is adjusted to the above range when the amount of water is 8 to 15% by mass. it can.

The water-swellable composition comprises a rubber, a water-swellable clay, a vulcanizing agent, and optionally various additives, using a mixer, such as a kneader, at a temperature below the vulcanization temperature, for example, 20 to 100 ° C. It can be prepared, for example, by kneading for 15 to 120 minutes until uniform.
The porous water-swellable elastic material is prepared by subjecting the water-swellable composition thus prepared to a temperature equal to or higher than the vulcanization temperature, for example, 120 to 200 ° C. It can be produced by vulcanizing for a minute. The hardness (C-type hardness meter), porosity, area circle equivalent diameter, ratio of appropriate area circle equivalent diameter, and swelling ratio can be adjusted by the method described above.
The single-pipe pipe pedestal and water-stopping material for scaffold of the present invention is formed by molding this porous water-swellable elastic material. Therefore, the single pipe pipe pedestal and water-stopping material for scaffold of the present invention has the same characteristics as the porous water-swellable elastic material, that is, hardness (C-type hardness meter), porosity, area equivalent circle diameter, appropriate area It has a ratio of equivalent circle diameter and swelling rate. The molding of the porous water-swellable elastic material can be performed simultaneously with the vulcanization of the water-swellable composition using, for example, a mold.

As shown in FIG. 5 (a), the single pipe pipe pedestal and water-stopping material for scaffolding of the present invention is a scaffold in a state in which the protrusion 6 is inserted into the inner hole of the single pipe pipe 63 for scaffolding during the scaffold assembling work. By constructing the single pipe pipe 63 for use in the joining portion, it is arranged at the construction location before placing the primary concrete. Further, the single pipe pipe pedestal and water-stopping material for scaffold of the present invention is disposed at the construction site before the scaffold assembly work, and the single pipe for scaffold so that the inner hole of the single pipe for scaffold 63 is inserted into the protrusion 6. By constructing the pipe 63, it is arranged at the construction site before placing the primary concrete. In this way, the single pipe pipe pedestal and water-stopping material for scaffolding according to the present invention is embedded in advance in the construction site in a state where the end face of the single pipe pipe 63 for scaffolding is received by the pipe receiving portion 51. Subsequently, after placing the primary concrete 14, the single pipe 63 for scaffolding is pulled out, and the secondary concrete 16 is placed in the generated gap.
In this manner, the primary concrete 14 and the secondary concrete 16 can be succeeded. And since the single pipe pipe pedestal and water-stopping material for scaffolding of the present invention has the above-mentioned configuration, it can be used even if the gaps generated after the single pipe pipe 63 for scaffolding is pulled out are various sizes. Demonstrate high water stopping performance. Moreover, even if the construction surface is inclined, it can be easily constructed.

  Next, the present invention will be described in more detail based on the following examples, but the present invention is not limited to these examples.

(Reference example)
First, 50 parts by weight of bentonite (manufactured by Kunimine Kogyo Co., Ltd .; trade name Kunigel VA, moisture 10.2% by weight), 50 parts by weight of butyl rubber, and an appropriate amount of a vulcanizing agent were used at 60 ° C. at 40 ° C. A water-swellable composition was prepared by kneading for a minute.

Example 1
Using the prepared water-swellable composition, a single pipe pipe pedestal and water-stopping material 2 for scaffold shown in FIG. 4 (a) was produced. That is, a single pipe for a scaffold having a disk-shaped plate-like body 5 and a conical protrusion 6A at the center, filled with a water-swellable composition in a mold and heated and vulcanized at 160 ° C. for 8 minutes. A pedestal and water stop material 2 was produced. This plate-like main body 5 had a diameter of 200 mm and a thickness of 5 mm. The protrusion 6A had a diameter of 30 mm and a height of 20 mm. The single pipe pipe pedestal and waterstop material 2 manufactured in this manner was used as a sample 1. In addition, the hardness (C-type hardness meter) of the single pipe pipe pedestal and water-stopping material 2 for the scaffold is 75.5, the porosity is 18.23%, the equivalent circle diameter is 17.4 to 489.5 μm, the appropriate area The ratio of equivalent circle diameter was 100%, and the swelling rate was about 350%. The hardness, porosity, area circle equivalent diameter, ratio of appropriate area circle equivalent diameter, and swelling ratio were adjusted to the above values according to the amount of water in bentonite among the methods described above.

(Example 2)
Using the prepared water-swellable composition, a single pipe pipe pedestal and water-stopping material 1 for scaffold shown in FIG. 1 was produced. That is, a single tube for a scaffold having a water-swellable composition filled in a mold, heated and vulcanized at 160 ° C. for 8 minutes, and having a disk-like plate-like body 5 and a truncated cone-like protrusion 6 at the center. A pipe pedestal and water stop material 1 was produced. This plate-like main body 5 had a diameter of 200 mm and a thickness of 5 mm. The protrusion 6 had a base diameter of 30 mm, an upper side diameter of 10 mm, and a height of 20 mm. The single pipe pipe pedestal and water-stopping material 1 manufactured in this way was used as a sample 2. The hardness, porosity, area circle equivalent diameter, ratio of appropriate area circle equivalent diameter, and swelling ratio were the same as those in Example 1.

(Example 3)
Using the prepared water-swellable composition, a single-pipe pipe pedestal and water-stopping material 3 for scaffold shown in FIG. 4B was produced. That is, a single-pipe pipe for a scaffold having a disk-shaped plate-like main body 5 and a hemispherical protrusion 6B in the center, filled with a water-swellable composition in a mold and heated and vulcanized at 160 ° C. for 8 minutes. A pedestal and water stop material 3 was produced. This plate-like main body 5 had a diameter of 200 mm and a thickness of 5 mm. The protrusion 6B had a diameter of 30 mm and a height of 15 mm. The single pipe pipe pedestal and water-stopping material 3 manufactured in this manner was used as a sample 3. The hardness, porosity, area circle equivalent diameter, ratio of appropriate area circle equivalent diameter, and swelling ratio were the same as those in Example 1.

(Comparative Example 1)
The prepared water-swellable composition is filled into a mold, heated and vulcanized at 160 ° C. for 8 minutes, and has a disk-like plate-like body and a columnar protrusion at the center. A waterstop was produced. This plate-like main body had a diameter of 200 mm and a thickness of 5 mm. The protrusions had a diameter of 40 mm and a height of 30 mm. The waterstop material thus produced was designated as Sample 4. The hardness, porosity, area circle equivalent diameter, ratio of appropriate area circle equivalent diameter, and swelling ratio were the same as those in Example 1.
(Comparative Example 2)
The prepared water-swellable composition was filled in a mold and vulcanized at 160 ° C. for 8 minutes to produce a disk-shaped plate having a diameter of 200 mm and a thickness of 5 mm. This plate-like waterstop material was designated as Sample 5. The hardness, porosity, area circle equivalent diameter, ratio of appropriate area circle equivalent diameter, and swelling ratio were the same as those in Example 1.

<Stability confirmation test after construction>
In each obtained sample, stability after construction was confirmed by the following method. Specifically, a projection is inserted into the inner hole of a single pipe for scaffolding having an outer diameter of about 50 mm and an inner diameter of about 40 mm, and this single pipe for scaffolding is assembled so as to be perpendicular to the horizontal plane. And the contact state between the sample and the back surface 5B of each sample and the contact state between the single pipe for scaffolding and the pipe receiving portion 51, that is, the plate-like main body 5. The construction surface was an inclined surface of 10 °, and the load acting on each sample was 50 kg. In addition, about the sample 5, after standing the sample 5 on the construction surface, the single pipe for scaffolding was assembled on it.

  As shown in Table 1, each of the samples 1 to 3 of the present invention has a single tube for scaffolding in which the contact state between the inclined construction surface and each sample is in “close contact” and is inclined along the construction surface. The contact state between the pipe 63 and the plate-like main body 5 was “full contact”. Therefore, it was found that the single pipe pipe pedestal and water-stopping material for scaffolds of Samples 1 to 3 were excellent in stability after construction even when the construction surface was inclined. Furthermore, the water stop effect is enhanced because the sample as the water stop material is in close contact with the construction surface. In this stability confirmation test after construction, the single pipe pipe 63 for scaffolding having an outer diameter of about 50 mm and an inner diameter of about 40 mm is used. Since the diameter is 200 mm, it can be easily understood that the same result can be obtained by using another scaffold single pipe 63 or a void pipe having an outer diameter larger than that of the scaffold single pipe 63 and having a diameter of about 190 mm. it can.

<Workability test and water stoppage performance confirmation test>
In addition to the obtained sample 2 and sample 5, a workability test and a water stop performance confirmation test were performed using the sample 6 described later, in comparison with a blank using no water stop material. The water-stopping performance confirmation test was performed separately when the water-permeable layer 12 described later is a horizontal surface, when it is inclined by 10 ° to be an inclined surface, and immediately after water injection and after 7 days have passed since water injection. In this case, “immediately after water injection” means that each sample is immediately before swelling, that is, immediately after the start of the test.
The apparatus used for this water stop performance confirmation test is demonstrated using FIG. Silica sand is put in the bottom of a tubular form 11 having a hemispherical bottom, a water permeable layer 12 is provided, a filter paper 13 is installed thereon, and a single pipe 63 for scaffolding 63 (FIG. 6) having an inner diameter of about 40 mm and an outer diameter of about 50 mm. The water-stopping material 15 of each sample was placed in the center of the mold 11 under the not shown in FIG. Next, the primary concrete 14 was cast around the scaffold single pipe, and when the primary concrete 14 was solidified, the scaffold single pipe 63 was pulled out, and the secondary concrete 16 was cast in the resulting gap (this state) Is shown in FIG. When the secondary concrete 16 was solidified, distilled water was injected from a water storage tank 18 adjusted to a predetermined pressure with a nitrogen cylinder 17, and air in the water permeable layer 12 was removed by opening the discharge port 19. The pressure was adjusted by the regulator 20, increased every 0.05 MPa, and held at each pressure for 10 minutes. During this 10 minutes, the presence or absence of water leakage from the interface (joint part) between the primary concrete 14 and the secondary concrete 16 was confirmed, and the pressure before one stage (0.05 MPa) of the pressure at which water leakage was confirmed was taken as the water stop pressure. . In addition, the height of the primary concrete 14 and the secondary concrete 16 was 250 mm, and the presence or absence of the water leakage from the joint part in the end surface of the primary concrete 14 and the secondary concrete 16 was confirmed. It shows that it is excellent in water stop, so that the numerical value of this water stop pressure is high. Moreover, the water-stopping performance immediately after injection shows the initial water-stopping ability before swelling, and the larger the pressure value, the higher the water-stopping ability before swelling. On the other hand, the water stop performance after 7 days indicates the water stop ability after swelling, and the greater the numerical value of pressure, the higher the water stop performance after swelling.
Sample 6 is based on Patent Document 1, and 65 parts by mass of water-swellable clay (specifically bentonite) and gelled base oil (specifically, 100 parts by mass of mineral oil, 50 parts by mass of lauric acid, and slaked lime). 9.2 parts by mass were mixed and prepared with an inorganic water-swellable material kneaded with 35 parts by mass of a gelled base oil obtained by heating to 90 ° C. For the sample 6, after pulling out the single pipe 63 for scaffolding, the sample 6 was filled in the generated gap, and the secondary concrete 16 was placed.
The workability was evaluated based on the ease of construction of the water-stopping material and the stability of the water-stopping material after construction.
The ease of construction was evaluated according to the following criteria.
“○”: When construction that can obtain a water-stopping effect without problems is possible “△”: Construction that can obtain a water-stopping effect without problems is possible, but when trouble is required “×”: Water-stopping In the case of construction that may cause problems in effectiveness The stability of the water stop material after construction was evaluated according to the following criteria.
“○”: When there is no possibility of losing the water stop effect due to misalignment of the water stop material, etc. “△”: When some measure is necessary to prevent the loss of the water stop effect “X”: Loss of the water stop effect If the evaluation is “Δ”, it can be said that the ease of construction of the water-stopping material and the stability of the water-stopping material after construction are both acceptable in practice.

  In the sample 2 of the present invention, the projecting portion 6 can be inserted into the single pipe for scaffolding regardless of whether the construction surface is a horizontal plane or an inclined surface, and when the position is adjusted to the center of the mold 11, it can be removed from the bottom of the single pipe for scaffolding 63. There was no, and it was excellent in workability. Moreover, it was found that the stability after construction was good and the water stop effect after construction could be maintained. On the other hand, the sample 5 having no protrusion cannot be moved together with the scaffolding single pipe at the time of position adjustment, and it is necessary to install the scaffolding single pipe after adjusting the arrangement position. Stability was also reduced. Since the sample 6 has plasticity, it can be filled in the gap and has good stability after the construction, but the construction site is narrow, so the construction takes time and is difficult to construct. In this workability test, the same results regarding workability can be obtained even when using a single pipe for a scaffold or a void pipe other than the single pipe for a scaffold having an inner diameter of about 40 mm and an outer diameter of about 50 mm. This is the same as the case of the stability confirmation test.

  As is apparent from Table 2, it was found that Sample 2 of the present invention exhibited high water stopping performance regardless of whether the construction surface was a horizontal surface or an inclined surface, although the workability was excellent. On the other hand, in Sample 5, water stopping performance and stability after construction are obtained on the horizontal surface, but the single pipe for scaffolding and the water-swellable sheet are only in contact with each other on the inclined surface, so that stability after construction is achieved. The secondary concrete 16 flowed into the single pipe for scaffolding, and the water stoppage performance was greatly reduced. Sample 6 was not affected by the inclination of the construction surface due to the difference in the water stopping method. In this water-stopping performance confirmation test, the same results regarding water-stopping performance can be obtained even when using a single pipe for a scaffold or a void pipe other than a single pipe for a scaffold with an inner diameter of about 40 mm and an outer diameter of about 50 mm. This is the same as in the construction stability confirmation test.

1, 1A, 1B, 2, 3 Scaffolding single pipe pipe pedestal / waterproofing material 5 Plate-like main body 5A Front surface 5B Back surface 5C Edges 6, 6A, 6B Protrusion 7, 8 Hole 11 Form 12 Water permeable layer 13 Filter paper 14 Primary concrete 15 Water-stopping material 16 Secondary concrete 17 Nitrogen cylinder 18 Water storage tank 19 Discharge port 20 Regulator 51 Pipe receiving portion 51A Edge 52 Concrete receiving portion 61 Outer peripheral edge 62 Jointing portion 63 Single pipe pipe H1 for scaffolding Width θ Angle of inclination

Claims (6)

A single-pipe pipe pedestal and water-stopping material for scaffolds made of a water-swellable material,
Single pipe pipe pedestal for scaffolding comprising a plate-like main body interposed between concrete and a construction surface of the concrete, and a projection having an inclined surface inclined from the surface of the plate-like main body to the surface Water stop material.   The single-pipe pipe pedestal and water-stopping material for scaffolding according to claim 1, wherein a pipe receiving portion and a concrete receiving portion are arranged on the surface of the plate-shaped main body, outside the outer peripheral edge of the protruding portion.   The single pipe pipe pedestal and water-stopping material for scaffolds according to claim 1 or 2, wherein the protruding portion has a cone shape, a frustum shape, a hemispherical shape, or a semi-elliptical spherical shape.   The single pipe pipe pedestal and waterstop material for scaffold according to any one of claims 1 to 3, wherein the protrusion has a maximum outer diameter of 10 mm or more and a height of 10 mm or more.   The single pipe pipe pedestal and water stop material for scaffolds according to any one of claims 1 to 4, wherein a width from an edge of the projection to an edge of the plate-like main body is 10 to 200 mm. The said water-swellable material is a porous water-swellable elastic material formed by vulcanizing a water-swellable composition containing rubber and a water-swellable clay. Single pipe pipe pedestal and water stop material for scaffolding.